WO2024109385A1 - Bag clamping apparatus, sealing structure, bag opening machine, and bag opening method - Google Patents

Abstract

The present invention relates to a bag clamping apparatus, comprising: a first pressing ring provided at a mouth portion of a material tank and provided with a first working wall; a second pressing ring movably sleeved on an outer wall of the material tank and provided with a second working wall used to match with the first working wall to tightly press a bulk bag; a circular pressing plate close to or distant from the material tank, a lower portion of the pressing plate being able to match with an inner wall of the material tank so as to tightly press the bulk bag, and an upper portion of the pressing plate matching with the first pressing ring so as to tightly press the bulk bag. When transferring a material from the bulk bag to the material tank, the pressing plate abuts against the material tank, the second pressing ring abuts against the first pressing ring, and a bottom edge of the bulk bag sequentially wraps over gaps between the lower portion of the pressing plate and the material tank, between the upper portion of the pressing plate and the first pressing ring, and between the first working wall and the second working wall, and is tightly pressed. The present invention also provides a sealing structure, a bag opening machine, and a bag opening method. The sealing structure and the bag clamping apparatus provided in the present invention can perform sealing of two layers of packaging simultaneously, so that continuous sealing and discharging between adjacent bulk bags for feeding is implemented.

Description

Bag clamping device, sealing structure, bag opening machine and bag opening method Technical Field

The present invention relates to the technical field of ton bag opening, and in particular to a bag clamping device, a sealing structure, a bag opening machine and a bag opening method for sealing a ton bag to prevent the material from overflowing when transferring the material from the ton bag to a material tank.

Background technique

Ton bags, also known as flexible freight bags, container bags, space bags, etc., are medium-sized bulk containers that are convenient for transporting bulk powder materials. They have the characteristics of large volume, light weight, and easy loading and unloading. They are one of the common packaging materials. In the fields of chemical industry, lithium battery, etc., sealed ton bags are often used to transport raw material powders. After unpacking, the powders are transferred to downstream equipment such as material tanks or pipelines for conveying the corresponding powders. Therefore, ton bag unpacking equipment is needed to connect the ton bags with downstream equipment.

In order to prevent dust from spilling out during the bag opening process, which may harm the health of personnel and affect the environment, the industry has high requirements for sealing during the bag opening process. The common end face sealing effect is poor, and there is still a risk of leakage for some materials with small particle size and light specific gravity. In addition, when replacing the ton bag, the feed port is completely exposed, and the residual powder will spill into the air.

In addition, ton bags also have various specifications, such as single-layer ton bags, double-layer and multi-layer ton bags containing at least inner bags and outer bags, etc. Due to factors such as hardness, ton bags with different numbers of layers and different materials are difficult to be opened with the same specification of bag opener. It is necessary to provide bag opening equipment for double-layer and multi-layer ton bags.

Summary of the invention

The object of the present invention is to at least provide a novel sealing structure that can be used in a bag opening machine.

A bag clamping device is used to seal a ton bag to prevent the material from spilling when transferring the material from the ton bag to downstream equipment. The bag clamping device comprises:

A first clamping ring, the first clamping ring is arranged at the mouth of the downstream device, and the first clamping ring is provided with a first working wall;

A second clamping ring, the second clamping ring is coaxially sleeved on the outer wall of the downstream device through the first driving device, and the second clamping ring is provided with a second working wall for cooperating with the first working wall and clamping the ton bag;

A pressure plate, wherein the middle of the annular pressure plate has a through hole for the ton bag to pass through, the pressure plate is arranged above the downstream device, and the pressure plate can be moved closer to or farther away from the downstream device through a second driving device; wherein the side wall of the lower part of the annular pressure plate can cooperate with the inner wall of the downstream device to press the ton bag, and the lower wall of the upper part of the pressure plate cooperates with the upper wall of the first clamping ring to press the ton bag;

When transferring materials from the ton bag to the downstream equipment, the pressure plate approaches the downstream equipment, the second pressure ring approaches the first pressure ring, and the bottom edge of the ton bag passes in sequence through the gap between the lower side wall of the pressure plate and the inner wall of the downstream equipment, between the lower wall of the pressure plate and the upper wall of the first pressure ring, and between the first working wall and the second working wall.

In some embodiments, the surface of the first working wall and the surface of the second working wall are both inclined surfaces.

In some embodiments, the top surface of the first clamping ring is recessed inward to form a first concave hole, and the first concave hole is filled with a first air bag that can expand after inflation and is used to press against the pressure plate.

In some embodiments, the side of the pressure plate facing the downstream device is recessed inward to form a second concave hole, and the second concave hole is filled with a second air bag that can expand after being inflated and is used to press against the inner wall of the downstream device.

In some embodiments, the pressing plate is formed with an insert.

The opening of the first concave hole faces upward and the width of the opening is smaller than the width of the first airbag so as to limit the first airbag in the first concave hole;

When transferring materials from the ton bag to the downstream equipment, the insert passes through the opening and falls into the first concave hole; the first airbag is inflated to press the insert tightly.

In some embodiments, a sealing strip is embedded in the first working wall, and a sealing strip is embedded in the second working wall.

In some embodiments, the tab extends in a vertical direction.

The present invention also provides a bag opening machine for preventing flying powder, which comprises the bag clamping device mentioned above.

The present invention also provides a bag opener, which is used to seal the ton bag to prevent the material from spilling when transferring materials from the ton bag with an inner bag and an outer bag to a material tank. The bag opener comprises:

A box body, with a bag opening clamping assembly disposed on the top of the box body;

A material tank, wherein the material tank is arranged inside the box body, and a secondary sealing component is provided at the mouth of the material tank;

The secondary sealing assembly includes a bag clamping device as described in any of the above.

The present invention also provides a package opening method of the aforementioned package opening machine, comprising the following steps:

The bag mouth of the double-layer ton bag is tied tightly to prevent the material from falling, and the bag mouth clamping assembly clamps the outer edge of the double-layer ton bag, while the inner edge of the double-layer ton bag is not restricted;

Pull down the inner bag of the ton bag and open the opening of the inner bag. At this time, the knotted position of the inner bag and the outer bag still prevents the powder from falling;

Pull down the edge of the inner bag, and use the secondary sealing component to seal the inner bag to the material tank;

Loosen the mouth of the double-layer bulk bag to allow the material to fall into the tank.

In some embodiments, the package opening method further comprises the following steps:

After unloading, clamp the inner bag, and the ton bag is deflated.

opening the secondary seal assembly to release the edge portion of the inner bag from the tank;

Push the inner bag upward into the outer bag, and re-tighten the bag opening of the double-layer ton bag to form a first seal, at which point only the outer bag is clamped by the bag opening clamping assembly;

Tighten the mouth of the double-layer bag again to form a second seal different from the first seal.

cutting the outer bag between the first seal and the second seal to remove the closed outer bag containing the inner bag;

At this time, only the outer bag edge of the original ton bag is left, and the unloading is completed.

The present invention also aims to provide a reasonably structured anti-flying powder bag opener and its sealing structure, which adopts a combination of multi-stage sealing, dynamic sealing and static sealing to prevent dust from spilling out; at the same time, during the replacement of ton bags, it is ensured that at least one seal plays a role in connecting the ton bag and the bag opener, thereby solving the problem of dust spilling out. Solve the leakage problem.

The technical solution adopted by the present invention is as follows:

A flying powder prevention sealing structure comprises a frame, a material tank is mounted on the frame, a piston cylinder is mounted on the side of the material tank, a piston rod of the piston cylinder points out along the bagging direction, a bag clamping device is mounted between the piston rod and the mouth of the material tank, and the bag clamping device comprises:

The outer bevel clamping ring and the coaxial movable sleeve are arranged on the outer wall of the tank; a lifting cylinder for lifting the outer bevel clamping ring is arranged on the side wall of the tank.

The reference ring is fixed to the mouth of the material tank. The side of the reference ring facing the outer inclined surface clamping ring is set as an inclined wedge surface, and this inclined wedge surface matches the inclined wedge surface of the outer inclined surface clamping ring. The top surface of the reference ring is set to be concave, and the concave part is filled with a first air bag.

The annular pressure plate is connected to the piston rod of the piston cylinder; a sealing flange is formed on the side of the annular pressure plate facing the material tank, and a second air bag for contacting the inner wall of the material tank is embedded in the sealing flange.

The bottom edge of the ton bag passes through the sealing flange and the reference ring in turn, and is clamped and pressed by the reference ring and the inclined wedge surface of the outer bevel pressing ring. The inclination direction of the inclined wedge surface of the reference ring and the outer bevel pressing ring is from the top of the outer bevel pressing ring to the side wall of the tank, and the part of the bottom edge of the ton bag extending out of the mouth of the tank is bent toward the outer wall of the tank.

As a further improvement of the above technical solution:

The top surface of the reference ring is concave to form a receiving groove, and the first airbag is embedded in the side wall of the receiving groove.

A height difference is reserved between the first airbag and the second airbag in the axial direction of the tank.

The deformation direction of the first airbag points to the axis of the material tank, and the deformation direction of the second airbag is away from the axis of the material tank.

The annular pressing plate is formed with an insert, which falls into the receiving groove accordingly; the first airbag is inflated to press the insert tightly.

The thickness of the insert is smaller than the width of the accommodating groove, and the first airbag is in a loose state between the insert and the assembled insert in the initial state.

After the outer bevel clamping ring, the reference ring and the annular pressure plate are assembled, a gap for accommodating the ton bag is reserved at the axial matching surface between the reference ring and the annular pressure plate; the first airbag and the second airbag are inflated to compensate for the gap.

A sealing strip is embedded on the inclined wedge surface of the outer inclined surface pressing ring, and a sealing strip is embedded on the inclined wedge surface of the reference ring.

A flying powder prevention bag opening machine is provided with the above-mentioned flying powder prevention sealing structure. The sealing structure and flying powder prevention bag opening machine provided by the present invention are compact, reasonable and easy to operate. By adopting a three-layer sealing structure that cooperates with each other, two layers of packaging can be sealed at the same time, so that adjacent ton bags for feeding are continuously sealed and discharged, preventing the discharge port from being completely exposed and dust from overflowing when the bag is replaced.

In the present invention, an outer inclined pressure ring, a reference ring and an annular pressure plate with a sealing flange are used to achieve three-layer sealing, and the three-layer sealing structure has hard surface contact pressure and elastically adjustable air bag pressure; the bottom edge of the ton bag is folded in an "S" shape and clamped in the three-layer sealing structure to achieve reliable sealing.

In the present invention, the three seals operate independently of each other and do not affect each other. When replacing the ton bag, a method of selecting part of the sealing structure for sealing can be adopted so that the ton bag can be updated while maintaining the sealing state to achieve the purpose of continuous feeding.

In the present invention, a negative pressure dust removal chamber is also provided to absorb the overflowing dust by using negative pressure to further ensure the external Cleanliness of the environment.

The steps of bagging, unbagging and taking out the bag of the present invention need to be performed in sequence. When replacing a new ton bag, the three-stage sealing structure can provide a reliable sealing environment without specifying the sequence.

The present invention also aims to provide a double-layer ton bag opening machine and method with a reasonable structure, which is particularly suitable for the opening process of double-layer ton bags. The outer ton bag and the inner ton bag are sealed respectively by utilizing the sealing structures at the box mouth and the internal material tank, thereby reducing leakage to meet the relevant dust leakage requirements of the national standard.

A double-layer ton bag bag opener is suitable for ton bags with inner and outer two-layer structures; the bag opener comprises a box body, a bag opening clamping assembly is arranged on the top of the box body, a material tank is arranged in the box body, and a secondary sealing assembly is arranged at the mouth of the material tank.

The bag opening clamping assembly includes a clamp group and an iris valve arranged in a vertical direction.

The secondary sealing assembly includes a gas sealing member expanded and tightened on the inner wall of the material tank and a clamp fastened on the mouth of the material tank.

As a further improvement of the above technical solution:

The clamp group, the iris valve, the air sealing element and the clamp operate independently of each other.

A bag opening method using a double-layer ton bag opening machine comprises the following steps:

The mouth of the double-layer ton bag is tied tightly with a rope, leaving the edge of the ton bag; the clamp group clamps the outer edge of the double-layer ton bag, and the inner edge of the double-layer ton bag is not restricted and is located above the iris valve in the closed state;

Open the iris valve, the operator reaches into the glove box, pulls down the inner bag of the ton bag, and cuts the tail end of the inner bag, leaving the inner bag open at the tail end. At this time, the knotted position of the inner bag and the outer bag still prevents the powder from falling;

Pull down the edge of the inner bag, pass it through the middle of the air seal, and go around the lower part of the circumference of the air seal to the clamp. The air seal will inflate the inner bag and the clamp will clamp the inner bag.

Open the knot of the ton bag and the powder falls into the material tank;

After unloading, close the iris valve first to clamp the inner bag, and the inner bag is in a deflated state;

Open the clamp, deflate the airtight seal, and loosen the edge of the inner bag;

Manually reach into the glove box to organize the inner pockets;

Open the iris valve, push the trimmed inner bag upward into the outer bag, tie the knot again, and then close the iris valve. At this time, only the outer bag is clamped and limited by the clamp assembly;

Tie another knot at the mouth of the ton bag. The new knot will seal the inner bag in the outer bag. Cut between the new knot and the original knot and remove the closed outer bag with the new knot.

At this time, only the outer bag edge of the original ton bag is left, and the unloading is completed; you can pause at this time, or continue to clamp the new ton bag for unloading.

As a further improvement of the above technical solution:

When manually reaching into the glove box to arrange the inner bag, the hard inner bag opening is folded over to shape and seal.

After the tidied inner bag is pushed into the outer bag, the knot tied again on the outer bag closes the inner bag in the outer bag.

The bag changing process includes the following steps:

The outer bag edge of the original ton bag is clamped by the clamp group, which includes a first clamp located at the top and a second clamp located at the bottom. First, loosen the first clamp, and the second clamp still clamps the outer bag of the original ton bag; send the outer bag edge of the new ton bag between the first clamp and the outer wall of the positioning tube, and the first clamp clamps the new ton bag. The outer pocket of the bag;

Loosen the second clamp, and the original ton bag loses the limiting force of the second clamp;

The second clamp clamps the outer bag edge of the new ton bag, and the outer bag edge of the original ton bag is now separated from the second clamp;

The first clamp is loosened, and the limiting force on the outer bag edge of the original ton bag is removed. At this time, the original ton bag is completely free, and the iris valve remains closed, and the original ton bag is located in the positioning tube;

The iris valve is opened and the edge of the original ton bag in the positioning tube is taken out of the glove box;

The first clamp and the second clamp clamp the outer bag edge of the new ton bag to prepare for unloading of the new ton bag.

During the replacement of new ton bags, the airtight seal and the clamp are in a closed and sealed state.

The double-layer ton bag opening machine provided by the present invention has a compact and reasonable structure and is easy to operate, and is particularly suitable for the double-layer ton bag opening process. The present invention provides two sets of independent sealing components, namely, a bag mouth clamping component located at the positioning tube and a secondary sealing component located at the mouth of the material tank, wherein the bag mouth clamping component is used to clamp the outer bag, and the secondary sealing component clamps the inner bag. If the inner bag is made of a harder material, the present invention uses fewer bends and uses the inner and outer walls of the tank to tighten to achieve sealing and limiting, ensuring that the hard inner bag will not be fatigued and damaged due to multiple or excessive bending;

The first clamp, the second clamp and the iris valve of the bag mouth clamping assembly are closed alternately, so that the sealing can be realized while the local limit can be realized at the same time, so that a gap can be provided to facilitate the switching of new and old ton bags while sealing and limiting;

In the unloading process of the present invention, both the inner bag and the outer bag are sealed; when unloading of one ton bag is completed, it can be switched to another ton bag without leakage, thereby ensuring the cleanliness of the operating environment.

The present invention is different from the commonly used single-layer ton bag sealing structure and the soft material ton bag sealing structure. It is not easy to cause local damage to the inner bag during the clamping process, thereby ensuring no leakage.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the overall structure of the first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the bag clamping device according to the first embodiment of the present invention.

FIG. 3 is an enlarged view of part A of FIG. 2 to illustrate the structure of the bag clamping device.

FIG. 4 is a schematic diagram of the initial state of FIG. 3 .

FIG. 5 is a schematic diagram of a closed state of FIG. 3 .

FIG. 6 is a schematic diagram of the three-dimensional structure of the bag clamping device of the first embodiment.

FIG. 7 is a schematic diagram of the three-dimensional structure of the bag clamping device of the first embodiment from another perspective.

FIG. 8 is a cross-sectional view of FIG. 7 .

Figure 9-a is a schematic diagram of the steps of setting a ton bag in an embodiment of the present invention.

FIG9-b is a schematic diagram of the first sealing steps in Example 1 of the present invention.

FIG9-c is a schematic diagram of the second and third sealing steps in Example 1 of the present invention.

Figure 9-d is a schematic diagram of the steps of opening a package and feeding materials in Example 1 of the present invention.

Figure 9-e is a schematic diagram of the steps of completing feeding and removing the sealing flange in Example 1 of the present invention.

FIG9-f is a schematic diagram of the steps of inserting a new ton bag in an embodiment of the present invention.

Figure 9-g is a schematic diagram of the steps of sealing a new ton bag in Example 1 of the present invention.

Figure 9-h is a schematic diagram of the steps of collecting opened ton bags in Example 1 of the present invention.

FIG9-i is a diagram showing the steps of a new ton bag being three-layer sealed and an opened ton bag being taken away in Example 1 of the present invention. Step diagram.

FIG. 10 is a schematic flow chart of a double-layer ton bag opening method according to the second embodiment of the present invention.

FIG. 11 is a schematic diagram of the initial state before material feeding in the second embodiment of the present invention.

FIG. 12 is a schematic diagram of opening the iris valve in step 2 of the embodiment of the present invention.

FIG. 13 is a schematic diagram of the inner bag in the pre-opened state in the second embodiment of the present invention.

FIG. 14 is a schematic diagram of the structure of an inner bag sealed to a material tank in accordance with a second embodiment of the present invention.

FIG. 15 is a schematic diagram of the unloading state after the inner bag is sealed in the second embodiment of the present invention.

FIG. 16 is a schematic diagram of a state in which the material discharge is completed and the iris valve is closed in the second embodiment of the present invention.

FIG. 17 is a schematic diagram of a folded inner bag in accordance with the second embodiment of the present invention.

FIG. 18 is a schematic diagram of arranging the inner bag according to the second embodiment of the present invention.

FIG. 19 is a schematic diagram of a state where the inner bag is put into the outer bag according to the second embodiment of the present invention.

FIG. 20 is a schematic diagram of the state of tying and cutting the outer bag in the second embodiment of the present invention.

21 is a schematic diagram of the state of the new ton bag and the original ton bag when they are replaced in the second embodiment of the present invention.

FIG. 22 is a schematic diagram of the state of removing the limiting force of the second clamp on the original ton bag in the second embodiment of the present invention.

FIG. 23 is a schematic diagram of the state of clamping a new ton bag in the second embodiment of the present invention.

FIG. 24 is a schematic diagram of the state of removing the original ton bag in Example 2 of the present invention.

FIG. 25 is a schematic diagram of the structure of a double-layer ton bag opening machine in Embodiment 2 of the present invention using the bag clamping device of Embodiment 1.

In Figures 1 to 9-i: 1. bag opening machine frame; 2. feed port; 3. material tank; 4. discharge port; 5. piston cylinder; 6. bag clamping device; 7. negative pressure dust removal chamber;

601, outer bevel clamping ring; 602, lifting cylinder; 603, sealing strip; 606, reference ring; 607, receiving groove; 608, first air bag; 609, annular pressure plate; 610, sealing flange; 611, second air bag; 612, insert; 613, sealing layer.

In Figures 10 to 25: 1. glove box; 2. sealing tank; 3. bag mouth clamping assembly; 4. secondary sealing assembly; 101. positioning tube; 301. first clamp; 302. second clamp; 303. iris valve; 401. air seal; 402. clamp; 403. piston cylinder; 404. lifting cylinder; 405. annular pressure plate; 406. outer bevel clamping ring; 501. outer bag; 502. inner bag; 6. material tank.

Detailed ways

The specific implementation of the present invention is described below in conjunction with the accompanying drawings.

Referring to FIG1 , a bag clamping device 6 is used to seal a ton bag to prevent the material from overflowing when transferring the material from the ton bag to the material tank 3, comprising:

A first clamping ring (reference ring 606), which is disposed at the mouth of the tank and has a first working wall;

A second clamping ring (external bevel clamping ring 601), which is coaxially sleeved on the outer wall of the tank 3 through the first driving device, and is provided with a second working wall for cooperating with the first working wall and clamping the ton bag;

A pressure plate, an annular pressure plate (annular pressure plate 609) has a through hole in the middle for the ton bag to pass through, the pressure plate is arranged above the material tank 3, and the pressure plate can be moved closer to or farther away from the material tank through a second driving device; wherein the side wall of the lower part of the annular pressure plate can cooperate with the inner wall of the material tank so as to Compressing the ton bag, the lower wall of the upper part of the pressing plate cooperates with the upper wall of the first pressing ring to compress the ton bag;

When transferring materials from a ton bag to a material tank, the pressure plate approaches the material tank, the second pressing ring approaches the first pressing ring, and the bottom edge of the ton bag passes through the gap between the lower side wall of the pressure plate and the inner wall of the material tank, between the lower wall of the pressure plate and the upper wall of the first pressing ring, and between the first working wall and the second working wall in sequence, so that the ton bag is compressed and sealed.

Embodiment 1

As shown in Fig. 1 to Fig. 9-i, the anti-flying powder sealing structure of this embodiment includes a frame, a material tank 3 is installed on the frame, a piston cylinder 5 is installed on the side of the material tank 3, the piston rod of the piston cylinder 5 points out along the bagging direction, and a bag clamping device 6 is installed between the piston rod and the mouth of the material tank 3. The bag clamping device 6 includes:

The outer bevel clamping ring 601 is coaxially sleeved on the outer wall of the tank 3; a lifting cylinder 602 (first driving device) for lifting the outer bevel clamping ring 601 is provided on the side wall of the tank 3.

The reference ring 606 is fixed to the mouth of the tank 3. The side of the reference ring 606 facing the outer inclined surface clamping ring 601 is set as an inclined wedge surface (i.e., the first working wall), and this inclined wedge surface is matched with the inclined wedge surface (second working wall) of the outer inclined surface clamping ring 601; the top surface of the reference ring 606 is set to be concave, and the concave part is filled with a first air bag 608.

The annular pressure plate 609 is connected to the piston rod of the piston cylinder 5 as the second driving device; a sealing flange 610 is formed on the side of the annular pressure plate 609 facing the material tank 3, and a second air bag 611 for contacting the inner wall of the material tank 3 is embedded on the sealing flange 610.

The bottom edge of the ton bag is clamped and pressed by the reference ring 606 and the inclined wedge surface of the outer bevel pressing ring 601 after passing through the sealing flange 610 and the reference ring 606 in turn. The inclination direction of the reference ring 606 and the inclined wedge surface of the outer bevel pressing ring 601 is from the top of the outer bevel pressing ring 601 to the side wall of the tank 3, and the part of the bottom edge of the ton bag extending out of the mouth of the tank 3 is bent toward the outer wall of the tank 3.

The top surface of the reference ring 606 is concave to form a receiving groove 607 , and the first airbag 608 is embedded in the side wall of the receiving groove 607 .

A height difference is reserved between the first airbag 608 and the second airbag 611 in the axial direction of the material tank 3 .

The deformation direction of the first airbag 608 points to the axis of the material tank 3, and the deformation direction of the second airbag 611 is away from the axis of the material tank 3.

An insert piece 612 is formed on the annular pressure plate 609 , and the insert piece 612 falls into the receiving groove 607 accordingly; the first airbag 608 is inflated to press the insert piece 612 tightly.

The thickness of the inserting piece 612 is smaller than the width of the receiving groove 607 , and the first airbag 608 is in a loose state with respect to the assembled inserting piece 612 in the initial state.

After the outer bevel clamping ring 601, the reference ring 606 and the annular pressure plate 609 are assembled, a gap for accommodating a ton bag is reserved at the axial matching surface between the reference ring 606 and the annular pressure plate 609; the first airbag 608 and the second airbag 611 are inflated to compensate for the gap.

A sealing strip 603 is embedded on the inclined wedge surface of the outer inclined surface pressing ring 601 , and a sealing strip 603 is embedded on the inclined wedge surface of the reference ring 606 .

The anti-flying powder bag opening machine of this embodiment is provided with the anti-flying powder sealing structure mentioned above.

The specific structure and working process of the present invention are as follows:

As shown in Figure 1, on the frame, a feed port 2, a material tank 3, and a discharge port 4 are arranged from top to bottom. The bag clamping device 6 is arranged at the mouth of the material tank 3. Piston cylinders 5 are symmetrically arranged on both sides of the material tank 3, and the piston rods of the piston cylinders 5 extend vertically upward, and an annular pressing plate 609 is installed at the end of the piston rod. A sealing flange 610 extends from the bottom surface of the annular pressing plate 609. With reference to Figures 2 and 3, the sealing flange 610 falls on the inner wall of the mouth of the material tank 3 as the annular pressing plate 609 is pressed down.

A groove is formed on one side of the sealing flange 610 facing the inner wall of the material tank 3, and a second air bag 611 is arranged in the groove. When the second air bag 611 is inflated, a pressing force is applied to the inner wall of the material tank 3.

An insert piece 612 is also provided on the annular pressure plate 609 . The diameter of the insert piece 612 is larger than the outer diameter of the sealing flange 610 . When the insert piece 612 is in the mating state, it falls on the outer side of the mouth of the tank 3 .

As shown in FIG3 and FIG4, a reference ring 606 formed outward is provided at the mouth of the material tank 3. The top surface of the reference ring 606 is concave to form a receiving groove 607, and the insert 612 falls into the receiving groove 607 when it is matched. The groove width of the receiving groove 607 is greater than the thickness of the insert 612. A first airbag 608 is embedded on the inner side wall of the receiving groove 607 away from the material tank 3. When the first airbag 608 is inflated, it presses against the insert 612.

An inclined wedge surface is provided on the side of the reference circle 606 away from the material tank 3 , and the inclined wedge surface is inclined from the side of the reference circle 606 away from the material tank 3 toward the axial direction of the material tank 3 .

A lifting cylinder 602 is fixedly installed on the outer wall of the material tank 3. The lifting cylinder 602 adopts a symmetrical arrangement or a ring array arrangement structure. The end of the piston rod of the lifting cylinder 602 is provided with an outer inclined surface clamping ring 601.

The outer bevel pressing ring 601 is embedded with a sealing strip 603 on its bevel surface, and the reference ring 606 is embedded with a sealing strip 603 on its bevel surface, and a space is reserved between the two sealing strips 603. The sealing strip 603 can be an elastic strip with a circular or irregular cross section, such as a rubber material.

5 , 8 and 9 , the package opening and package changing process of the present invention is described.

As shown in Fig. 9-a, it is the initial state of the bag clamping device 6. The three sealing structures are disengaged from each other, and the ton bag is placed above the bag clamping device 6 and supported by the feeding port 2. The ton bag edge is left at the sealing position at the bottom of the ton bag, that is, the bottom edge of the ton bag in the present invention. The bottom edge of the ton bag falls into the annular pressure plate 609, and then after passing through the sealing flange 610, it covers the reference ring 606, and then is placed along the inclined wedge surface of the reference ring 606, so that it is located between the reference ring 606 and the inclined wedge surface of the outer inclined surface clamping ring 601.

As shown in Fig. 9-b, the outer bevel pressing ring 601 is lifted up to clamp the bottom edge of the ton bag to achieve the first seal. As an alternative implementation, in this process, the sealing strip 603 is replaced by a sealing layer 613 to increase the sealing area.

As shown in Figure 9-c, the annular pressure plate 609 is pressed down, the sealing flange 610 is pressed into the mouth of the tank 3, and the insert 612 falls into the receiving groove 607. At this time, the bottom edge of the ton bag is arranged along the sealing flange 610, the wall of the mouth of the tank 3, the shape of the insert 612, the top surface of the reference ring 606, the reference ring 606 and the inclined wedge surface of the outer inclined clamping ring 601, and is inflated and tightened by the first airbag 608 and the second airbag 611, thus completing the three seals.

As shown in FIG9 - d , reach in from the glove opening to open the sealed ton bag, or open the ton bag from the outside, and the powder in the ton bag falls into the material tank 3 .

As shown in FIG. 9-e , after the feeding is completed, the ton bag is re-tightened; then the second airbag 611 is deflated to remove the tightening force, and the annular pressure plate 609 is lifted up to remove a seal.

As shown in FIG9-f, the outer inclined surface pressing ring 601 falls, and the opened ton bag is folded upward. The bottom edge is no longer clamped by the inclined wedge surface, but part of it still falls into the receiving groove 607 of the reference ring 606 and is held by the first air The bag 608 is compressed and sealed. Even if there is residual powder in the unpacked ton bag, it still falls into the material tank 3 and is not easy to overflow.

Then, a new ton bag is inserted, and the bottom edge of the new ton bag passes around the reference ring 606 and is clamped and sealed by the inclined wedge surface.

As shown in FIG9-g , the outer inclined clamping ring 601 is lifted up to press the bottom edge of the new ton bag, and at the same time, the opened ton bag is pulled downward through the glove opening to arrange it. During the arrangement process, be careful not to use excessive pulling force to damage the first airbag 608 .

As shown in Figure 9-h, the annular pressure plate 609 is pressed down; the sealing flange 610 is embedded in the mouth of the material tank 3, and the insert 612 is embedded in the receiving groove 607; then the first airbag 608 is deflated, the sealing tightening force is removed, and the bottom edge of the opened ton bag loses its limit and can be collected from the glove opening.

As shown in Figure 9-i, the annular pressure plate 609 continues to be pressed down to the sealing position, the first airbag 608 and the second airbag 611 are inflated, and after the three-layer seal takes effect, the opened ton bags are collected and taken away. At this time, there is only one unopened ton bag on the bag clamping device 6, waiting to be opened and unloaded.

The present invention adopts a multi-channel sealing structure that acts independently of each other, so that the ton bag can be opened and loaded continuously in a sealed environment, and dust is not easy to overflow, thereby ensuring the cleanliness and safety of the operating environment.

Embodiment 2 This embodiment provides a bag opening machine for sealing a ton bag containing an inner bag 502 and an outer bag 501 to prevent the material from overflowing when transferring the material from the ton bag to the material tank 6, comprising:

A box body, with a bag opening clamping assembly disposed on the top of the box body;

A material tank, wherein the material tank is arranged inside the box body, and a secondary sealing component is provided at the mouth of the material tank;

The secondary sealing assembly includes the bag clamping device provided in the first embodiment.

The package opening method using the package opening machine includes the following steps:

Tighten the mouth of the double-layer ton bag (for example, using a tying rope) to prevent the material from falling, and the bag mouth clamping assembly clamps the outer edge of the double-layer ton bag, while the inner edge of the double-layer ton bag is not restricted;

Pull down the inner bag of the ton bag and open the opening of the inner bag. At this time, the knotted position of the inner bag and the outer bag still prevents the powder from falling;

Pull down the edge of the inner bag, and use the secondary sealing component to seal the inner bag to the material tank;

Loosen the mouth of the double-layer bulk bag to allow the material to fall into the tank.

After unloading, clamp the inner bag, and the ton bag is deflated.

opening the secondary seal assembly to release the edge portion of the inner bag from the tank;

Push the inner bag upward into the outer bag, and re-tighten the bag opening of the double-layer ton bag to form a first seal, at which point only the outer bag is clamped by the bag opening clamping assembly;

Tighten the mouth of the double-layer bag again to form a second seal different from the first seal.

cutting the outer bag between the first seal and the second seal to remove the closed outer bag containing the inner bag;

At this time, only the outer bag edge of the original ton bag is left, and the unloading is completed.

As shown in Figures 10 to 25, the bag opener of this embodiment is suitable for double-layer ton bags or multi-layer ton bags with an inner and outer two-layer structure; the bag opener includes a box body, a bag opening clamping assembly 3 is arranged on the top of the box body, a material tank 2 is arranged in the box body, and a secondary sealing assembly 4 is arranged at the mouth of the material tank 2, as shown in Figure 25, wherein the secondary sealing assembly 4 Component 4 can select the bag clamping device of embodiment 1, the annular pressure plate 405 is connected to the piston rod of the piston cylinder 403 serving as the second driving device, and a coaxial movable sleeve is arranged on the outer bevel clamping ring 406 of the outer wall of the material tank 6. A lifting cylinder 404 (first driving device) for lifting the outer bevel clamping ring 601 is provided on the side wall of the material tank 6.

The bag opening clamping assembly 3 includes a clamp assembly and an iris valve 303 arranged in the vertical direction.

The secondary sealing assembly 4 includes a gas sealing member 401 expanded and tightened on the inner wall of the tank 2 and a clamp 402 fastened to the mouth of the tank 2 .

The clamp assembly, the iris valve 303, the air seal 401 and the clamp 402 operate independently of each other.

The bag opening method using the double-layer ton bag opening machine of this embodiment includes the following steps:

The mouth of the double-layer ton bag is tied tightly with a rope, leaving the edge of the ton bag; the clamp assembly clamps the outer edge of the double-layer ton bag, and the inner edge of the double-layer ton bag is not restricted and is located above the iris valve 303 in the closed state;

Open the iris valve 303, the operator reaches into the glove box 1, pulls down the inner bag of the ton bag, and cuts the tail end of the inner bag, so that the tail end of the inner bag is open. At this time, the knotted position of the inner bag and the outer bag still prevents the powder from falling.

Pull down the edge of the inner bag, pass through the middle of the air seal 401, and go around the hoop 402 from below the circumference of the air seal 401. Inflate the air seal 401 to compress the inner bag, and the hoop 402 clamps the inner bag.

Open the knot of the ton bag, and the powder falls into the material tank 2;

After the material is unloaded, the iris valve 303 is closed first to clamp the inner bag, and the inner bag is in a deflated state;

Open the clamp 402, deflate the airtight seal 401, and loosen the edge of the inner bag;

Manually reach into the glove box 1 to organize the inner bag;

Open the iris valve 303, push the arranged inner bag upward into the outer bag, tie the knot again, and then close the iris valve 303. At this time, only the outer bag is clamped and limited by the clamp assembly;

Tie another knot at the mouth of the ton bag. The new knot will seal the inner bag in the outer bag. Cut between the new knot and the original knot and remove the closed outer bag with the new knot.

At this time, only the outer bag edge of the original ton bag is left, and one unloading is completed; at this time, you can stop unloading, or you can continue to replace it with a new ton bag and prepare to unload again.

In the above process, when manually reaching into the glove box 1 to arrange the inner bag, the inner bag opening with hardness is folded and shaped to be closed.

After the tidied inner bag is pushed into the outer bag, the knot tied again on the outer bag closes the inner bag in the outer bag.

The bag changing process includes the following steps:

The outer bag edge of the original ton bag is clamped by the clamp group, which includes a first clamp 301 located at the top and a second clamp 302 located at the bottom. The first clamp 301 is first loosened, and the second clamp 302 still clamps the outer bag of the original ton bag; the outer bag edge of the new ton bag is sent between the first clamp 301 and the outer wall of the positioning tube 101, and the first clamp 301 clamps the outer bag of the new ton bag;

The second clamp 302 is loosened, and the limiting force of the second clamp 302 is lost on the original ton bag;

The second clamp 302 clamps the outer bag edge of the new ton bag, and the outer bag edge of the original ton bag is now separated from the second clamp 302;

The first clamp 301 is loosened, and the limiting force on the outer bag edge of the original ton bag is removed. At this time, the original ton bag is completely free, and the iris valve 303 is always kept closed, and the original ton bag is located in the positioning tube 101;

The iris valve 303 is opened, and the edge of the original ton bag in the positioning tube 101 is taken out of the glove box 1;

The first clamp 301 and the second clamp 302 clamp the outer bag edge of the new ton bag to prepare for unloading of the new ton bag.

During the bag changing operation, the air seal 401 and the clamp 402 are not in operation, and the material tank is in an open state. The continuous negative pressure inside the glove box and the material tank is relied on to ensure that there is no dust spillage.

The specific structure and working process of the present invention are as follows:

The present invention is a bag opener specially designed for the bag opening process of double-layer ton bags, with the purpose of preventing dust from spilling out, especially in the process of switching between new and old ton bags, it is necessary to ensure that both the new ton bags and the original ton bags are not prone to dust leakage, and considering that the inner bag of the double-layer ton bag may be a soft bag or a hard bag made of materials such as aluminum foil with a certain hardness, the present invention designs a special bag opener that can seal and clamp both soft bags and hard bags.

As shown in FIG. 11 , this is the preparation state of the bag opener. At this time, except for the clamp holding the ton bag, all sealing structures are in the initial state.

To facilitate packaging, ton bags are usually provided with an edge at the packaging position, i.e., the knot in FIG11 . The edge of the outer bag is clamped by the first clamp 301 and the second clamp 302 , while the inner bag is temporarily not clamped and is located in the area surrounded by the iris valve 303 and the positioning tube 101 .

At this time, the first clamp 301, the second clamp 302, and the iris valve 303 are in a closed state; the air seal 401 and the clamp 402 located at the mouth of the tank 2 are in a closed state. In order to facilitate the cooperation with the mouth of the tank 2, the air seal 401 includes an annular top plate, which has a shape and hardness and can be placed at the mouth of the tank 2; below the top plate is an elastic air seal body, which swells when inflated and is pressed against the inner wall of the mouth of the tank 2.

The glove box 1 of the present invention is provided with a glove position, which is convenient for workers to put their hands in to sort out the ton bags. Since the glove box 1 is a conventional technical means, it will not be described in detail in this embodiment.

As shown in Figure 12, the material is ready to be unloaded. The inner bag is usually outside the knot and has a hot-pressed package at the mouth. The iris valve 303 is opened to make the seal of the inner bag above the material tank 2. At this time, the airtight seal 401 is not inflated and is ready to accommodate the inner bag.

As shown in Figures 13 and 14, cut open the aluminum foil seal of the inner bag, pull the inner bag down, make the inner bag pass through the middle of the airtight seal 401, then pull the edge of the inner bag to the bottom of the airtight seal, go around the airtight seal, go around the edge of the mouth of the tank 2, and pass through the hoop 402, forming a horizontal "S" shape that goes around the hoop 402 and the airtight seal 401. The airtight seal is inflated and tightened, pressing the inner bag against the inner wall of the tank 2; the hoop 402 clamps the inner bag against the outer wall of the tank 2.

As shown in FIG. 15 , the knot is opened and the powder in the inner bag falls into the material tank 2 .

As shown in FIG16, after the material is dropped, the iris valve 303 is closed first, and the iris valve 303 clamps the inner bag; then, as shown in FIG17, the clamp 402 is opened, the expansion force of the air seal 401 is removed, and the inner bag is retracted from the mouth of the material tank 2. At this time, the worker reaches into the glove box 1, as shown in FIG18, and arranges the inner bag with a certain hardness. The arrangement method can be folded at the mouth, rolled, etc., in order to close the inner bag and prevent the internal dust from falling out.

Open the iris valve 303, as shown in Figure 19, push the arranged inner bag up into the outer bag, and then tie the outer bag so that the inner bag is placed in the outer bag. Then close the iris valve 303. Figure 19 is a schematic diagram of the state where the arrangement and knotting are completed and the iris valve 303 is closed.

As shown in Figure 20, tie another knot on the basis of the knotted ton bag, leaving a space for shearing between the two knots. The outer bag is cut between the two knots at the cutting position, and the inner bag is now received in the outer bag with a knot; the edge of the outer bag has a knot and is clamped by the first clamp 301 and the second clamp 302. At this point, the unloading process of the first ton bag is completed.

As shown in Figures 21 to 24, the process of connecting the second ton bag with the remaining outer bag edge of the first ton bag is shown in Figure 21. The outer bag edge of the new ton bag is clamped by the first clamp 301. The outer bag edge of the new ton bag is first clamped by the first clamp 301, and the second clamp 302 remains stationary and still clamps the outer bag of the original ton bag. At this time, the outer bag of the new ton bag is clamped by the first clamp 301, and the outer bag of the original ton bag is clamped by the first clamp 301 and the second clamp 302.

As shown in FIG22 , the second clamp 302 is loosened, and the original ton bag is detached from the second clamp 302 , while the first clamp 301 still clamps the original ton bag and the new ton bag;

As shown in FIG. 23 , the second clamp 302 clamps the new ton bag, but be careful not to clamp the original ton bag; at this time, the first clamp 301 clamps the new ton bag and the original ton bag, and the second clamp 302 clamps the new ton bag;

As shown in Figure 24, the second clamp 302 does not move, the first clamp 301 is loosened, and the worker reaches into the glove box 1 to take away the original ton bag; the first clamp 301 is clamped again. At this time, the first clamp 301 and the second clamp 302 clamp the new ton bag, and the new ton bag is in place, as shown in the state in Figure 10, and the new ton bag can be prepared for unloading.

It should be noted that the clamps, hoop and gas seal mentioned in the present invention only play the role of fastening and sealing in the process. Therefore, in theory, any fastener that has the function of fastening and sealing can be used in the technical solution proposed by the present invention as a replacement implementation. The operation of simply replacing the clamps, hoop and gas seal still falls within the scope of the technical solution of the present invention.

The present invention limits the outer bag and the inner bag separately based on the actual situation that the inner bag of the double-layer ton bag has high hardness and is not suitable for multiple folding and deformation limiting. At the same time, it provides a material unloading process method in which no dust overflow occurs between connections and steps, thereby solving the problem of easy leakage of powder in the double-layer ton bag.

The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims (26)

1. A bag clamping device is used to seal a ton bag to prevent the material from spilling out when transferring the material from the ton bag to the downstream equipment, characterized in that the bag clamping device comprises:

   A first clamping ring, the first clamping ring is arranged at the mouth of the downstream device, and the first clamping ring is provided with a first working wall;

   A second clamping ring, the second clamping ring is coaxially sleeved on the outer wall of the downstream device through the first driving device, and the second clamping ring is provided with a second working wall for cooperating with the first working wall and clamping the ton bag;

   A pressure plate, wherein the middle of the annular pressure plate has a through hole for the ton bag to pass through, and the pressure plate can be moved closer to or farther away from the downstream device through a second driving device; wherein the side wall of the lower part of the annular pressure plate can cooperate with the inner wall of the downstream device to press the ton bag, and the lower wall of the upper part of the pressure plate cooperates with the upper wall of the first clamping ring to press the ton bag;

   When transferring materials from the ton bag to the downstream equipment, the pressure plate approaches the downstream equipment, the second pressure ring approaches the first pressure ring, and the bottom edge of the ton bag passes in sequence through the gap between the lower side wall of the pressure plate and the inner wall of the downstream equipment, between the lower wall of the pressure plate and the upper wall of the first pressure ring, and between the first working wall and the second working wall.
2. The bag clamping device according to claim 1 is characterized in that the surface of the first working wall and the surface of the second working wall are both inclined surfaces.
3. The bag clamping device according to any of the preceding claims is characterized in that the top surface of the first clamping ring is recessed inwardly to form a first concave hole, and the first concave hole is filled with a first air bag that can expand after inflation and is used to press against the pressure plate.
4. The bag clamping device according to any of the preceding claims is characterized in that the side of the pressure plate facing the downstream device is recessed inward to form a second concave hole, and the second concave hole is filled with a second air bag that can expand after inflation and is used to press against the inner wall of the downstream device.
5. The bag clamping device according to claim 3 is characterized in that an insert is formed on the pressing plate.

   The opening of the first concave hole faces upward and the width of the opening is smaller than the width of the first airbag so as to limit the first airbag in the first concave hole;

   When transferring materials from the ton bag to the downstream equipment, the insert passes through the opening and falls into the first concave hole; the first airbag is inflated to press the insert tightly.
6. The bag clamping device according to any of the preceding claims is characterized in that a sealing strip is embedded on the first working wall and a sealing strip is embedded on the second working wall.
7. The bag clamping device according to claim 5, characterized in that the insert extends in a vertical direction.
8. A sealing structure, comprising a frame, characterized in that the sealing structure also comprises a bag clamping device as claimed in any of the preceding claims,

   A material tank is mounted on the frame, the second driving device comprises a piston cylinder arranged on the side of the material tank, the piston rod of the piston cylinder points out along the bagging direction, and the bag clamping device is arranged between the piston rod and the mouth of the material tank.

   The second clamping ring is an outer bevel clamping ring, and the bevel clamping ring is coaxially sleeved on the outer wall of the tank; a lifting cylinder for lifting the outer bevel clamping ring is provided on the side wall of the tank.

   The first clamping ring is a reference ring, which is fixed to the mouth of the material tank. The side of the reference ring facing the outer inclined clamping ring is set as an inclined wedge surface, and this inclined wedge surface matches the inclined wedge surface of the outer inclined clamping ring; the top surface of the reference ring is concave, and the concave part is filled with a first airbag.

   The annular pressure plate is connected to the piston rod of the piston cylinder; the lower part of the annular pressure plate is a sealing flange formed on the side facing the material tank, and a second air bag for contacting the inner wall of the material tank is embedded in the sealing flange.

   The bottom edge of the ton bag passes through the sealing flange and the reference ring in turn, and is clamped and pressed by the reference ring and the inclined wedge surface of the outer bevel pressing ring. The inclination direction of the inclined wedge surface of the reference ring and the outer bevel pressing ring is from the top of the outer bevel pressing ring to the side wall of the tank, and the part of the bottom edge of the ton bag extending out of the mouth of the tank is bent toward the outer wall of the tank.
9. The sealing structure as described in claim 8 is characterized in that: the first concave hole of the first clamping ring is a receiving groove formed by the concave top surface of the reference ring, and the first airbag is embedded in the side wall of the receiving groove.
10. The sealing structure according to claim 9 is characterized in that a height difference is reserved between the first airbag and the second airbag in the axial direction of the tank.
11. The sealing structure as described in claim 10 is characterized in that: the deformation direction of the first airbag points to the axis of the material tank, and the deformation direction of the second airbag is away from the axis of the material tank.
12. The sealing structure as described in claim 8 is characterized in that: an insert is formed on the annular pressure plate, and the insert falls into the receiving groove accordingly; the first airbag is inflated to press the insert tightly.
13. The sealing structure as described in claim 12 is characterized in that the thickness of the insert is smaller than the width of the accommodating groove, and the first airbag is in a relaxed state in the initial state and the assembled insert.
14. The sealing structure as described in claim 13 is characterized in that: after the outer bevel clamping ring, the reference ring and the annular pressure plate are assembled, a gap for accommodating the ton bag is reserved at the axial mating surface between the reference ring and the annular pressure plate; the first airbag and the second airbag compensate for the gap after being inflated.
15. The sealing structure as described in claim 8 is characterized in that a sealing strip is embedded on the inclined wedge surface of the outer inclined surface pressure ring, and a sealing strip is embedded on the inclined wedge surface of the reference ring.
16. A flying powder prevention bag opening machine, characterized by comprising a sealing structure as described in any one of claims 8 to 15.
17. A bag opening machine to prevent flying powder, characterized by comprising a bag clamping device as described in any one of claims 1 to 7.
18. A bag opener is used to seal a ton bag containing an inner bag and an outer bag to prevent the material from spilling when transferring the material from the ton bag to a downstream device, characterized in that the bag opener comprises:

    A box body, with a bag opening clamping assembly disposed on the top of the box body;

    A downstream device, the mouth of which is arranged inside the box, and a secondary sealing component is provided at the mouth of the downstream device;

    The secondary sealing assembly comprises a bag clamping device as described in any one of claims 1-7.
19. A package opening method using the package opening machine according to claim 18, characterized in that it comprises the following steps:

    The bag mouth of the double-layer ton bag is tied tightly to prevent the material from falling, and the bag mouth clamping assembly clamps the outer edge of the double-layer ton bag, while the inner edge of the double-layer ton bag is not restricted;

    Pull down the inner bag of the ton bag and open the opening of the inner bag. At this time, the knotted position of the inner bag and the outer bag still prevents the powder from falling;

    Pull down the edge of the inner bag and use the secondary sealing assembly to seal the inner bag to the downstream equipment;

    Loosen the mouth of the double-layer bulk bag to allow the material to fall into the downstream equipment.
20. The package opening method according to claim 19, further comprising the following steps:

    After unloading, clamp the inner bag, and the ton bag is deflated.

    opening the secondary seal assembly to release the edge portion of the inner bag from the downstream equipment;

    Push the inner bag upward into the outer bag, and re-tighten the bag opening of the double-layer ton bag to form a first seal, at which point only the outer bag is clamped by the bag opening clamping assembly;

    Tighten the mouth of the double-layer bag again to form a second seal different from the first seal.

    cutting the outer bag between the first seal and the second seal to remove the closed outer bag containing the inner bag;

    At this time, only the outer bag edge of the original ton bag is left, and the unloading is completed.
21. A bag opener for double-layer ton bags, characterized in that: it is suitable for ton bags with inner and outer two-layer structures; the bag opener comprises a box body, a bag opening clamping assembly is arranged on the top of the box body, a material tank is arranged in the box body, and a secondary sealing assembly is arranged at the mouth of the material tank,

    The bag opening clamping assembly includes a clamp group and an iris valve arranged in a vertical direction.

    The secondary sealing assembly includes a gas sealing member expanded and tightened on the inner wall of the material tank and a clamp fastened on the mouth of the material tank.
22. The double-layer ton bag opener as described in claim 21 is characterized in that the clamp group, iris valve, airtight seal, and clamp operate independently of each other.
23. A bag opening method using the double-layer ton bag opening machine according to claim 21, characterized in that it comprises the following steps:

    The mouth of the double-layer ton bag is tied tightly with a rope, leaving the edge of the ton bag; the clamp group clamps the outer edge of the double-layer ton bag, and the inner edge of the double-layer ton bag is not restricted and is located above the iris valve in the closed state;

    Open the iris valve, the operator reaches into the glove box, pulls down the inner bag of the ton bag, and cuts the tail end of the inner bag, leaving the inner bag open at the tail end. At this time, the knotted position of the inner bag and the outer bag still prevents the powder from falling;

    Pull down the edge of the inner bag, pass it through the middle of the air seal, and go around the lower part of the circumference of the air seal to the clamp. The air seal will inflate the inner bag and the clamp will clamp the inner bag.

    Open the knot of the ton bag and the powder falls into the material tank;

    After unloading, close the iris valve first and clamp the inner bag. At this time, the ton bag is deflated.

    Open the clamp, deflate the airtight seal, and loosen the edge of the inner bag;

    Manually reach into the glove box to organize the inner pockets;

    Open the iris valve, push the trimmed inner bag upward into the outer bag, tie the knot again, and then close the iris valve. At this time, only the outer bag is clamped and limited by the clamp assembly;

    Tie another knot at the mouth of the ton bag. The new knot will seal the inner bag in the outer bag. Cut between the new knot and the original knot and remove the closed outer bag with the new knot.

    At this time, only the outer bag edge of the original ton bag is left, and the unloading is completed.
24. The double-layer ton bag opening method according to claim 23 is characterized in that: manually inserting the glove When arranging the inner bags in the box, the hard inner bag openings are folded over to shape and seal.
25. The double-layer ton bag opening method as described in claim 24 is characterized in that after the sorted inner bag is pushed into the outer bag, the knot tied again on the outer bag seals the inner bag in the outer bag.
26. The double-layer ton bag opening method according to claim 23 is characterized in that the bag changing process comprises the following steps:

    The outer bag edge of the original ton bag is clamped by the clamp group, which includes a first clamp located at the top and a second clamp located at the bottom. The first clamp is first loosened, and the second clamp still clamps the outer bag of the original ton bag; the outer bag edge of the new ton bag is sent between the first clamp and the outer wall of the positioning tube, and the first clamp clamps the outer bag of the new ton bag;

    Loosen the second clamp, and the original ton bag loses the limiting force of the second clamp;

    The second clamp clamps the outer bag edge of the new ton bag, and the outer bag edge of the original ton bag is now separated from the second clamp;

    The first clamp is loosened, and the limiting force on the outer bag edge of the original ton bag is removed. At this time, the original ton bag is completely free, and the iris valve remains closed, and the original ton bag is located in the positioning tube;

    The iris valve is opened and the edge of the original ton bag in the positioning tube is taken out of the glove box;

    The first clamp and the second clamp clamp the outer bag edge of the new ton bag to prepare for unloading of the new ton bag.