CN221562425U - Chopping board structure of double-stroke notching machine - Google Patents

Abstract

The utility model discloses a chopping board structure of a double-stroke notching machine, which comprises a frame, a longitudinal sliding assembly, a transverse sliding assembly, a panel assembly, a chopping board, a driving sleeve, a driving block, a mandrel and a rotary driving unit, wherein the rotary driving unit is vertically arranged and can drive in forward and reverse directions, the top flange of the rotary driving unit is connected to a driving mounting hole formed in the middle of a top plate of the frame, an output shaft of the rotary driving unit is connected with the driving block, a top disc of the driving block is provided with a deflection guide hole groove, the bottom end of the mandrel is connected in the deflection guide hole groove in a sliding manner, the driving sleeve is coaxially sleeved on the mandrel, and the driving sleeve drives the panel assembly to horizontally move. The utility model adopts two eccentric driving strokes to drive the panel assembly to move, thereby improving the utilization rate of the chopping board area and reducing the production cost.

Description

Chopping board structure of double-stroke notching machine

Technical Field

The utility model relates to the technical field of plastic bag making machines, in particular to a chopping board structure of a double-stroke notching machine.

Background

In the processing flow of the vest bag, one processing procedure is to use a punching machine to punch the plastic bag into a shape with a portable plastic bag. This process requires that the die cutting device of the notching machine and the die cutting block mechanism be mutually matched, wherein the die cutting block mechanism is arranged right below the die cutting device. The prior punching device comprises a punching cutter and a punching cylinder for driving the punching cutter to reciprocate up and down to realize punching. When the conveying device conveys the plastic bags with certain thickness to the chopping board of the chopping board punching mechanism, the punching device completes punching downwards and then resets. When the punching device completes punching once, the chopping block can move or rotate for a certain angle, so that punching tool marks cannot be repeated, and the service time of the chopping block is longer. At present, in order to enable two chopping boards to move or rotate simultaneously, most of the production equipment for two parallel vest bags adopts a mode that two chopping boards are sleeved by a horizontal movement panel assembly, and adopts an eccentric shaft to drive the panel assembly to move horizontally and longitudinally in a combined mode, so that the chopping boards are driven to move and rotate in chopping board holes of the panel assembly.

However, because the force of the die cutting device is large and the frequency is high, although the cutting board can continuously move and rotate, the rotating track of the eccentric shaft is set, so that the die cutting tool marks are always concentrated on a plurality of annular positions of the cutting board, after the die cutting for a certain number of times is finished, annular grooves are formed on the cutting board, the surface of the cutting board is uneven, other positions of the cutting board are not fully utilized because the cutting board is not cut, the die cutting effect and the bag manufacturing quality are affected, the cutting board is replaced frequently, and the production cost is increased.

Therefore, there is a need to develop a two-stroke notching machine anvil structure that addresses the above-mentioned drawbacks.

Disclosure of utility model

The utility model aims to provide a chopping block structure of a double-stroke notching machine, which adopts two eccentric driving strokes to drive a panel assembly to move, thereby improving the utilization rate of the chopping block area and reducing the production cost.

In order to solve the technical problems, the utility model adopts the following technical scheme:

The utility model discloses a chopping board structure of a double-stroke notching machine, which comprises a frame, a longitudinal sliding component, a transverse sliding component, a panel component and a chopping board, wherein the panel component can be horizontally and slidably stacked on the top surface of the frame through the longitudinal sliding component and the transverse sliding component, two chopping board holes are symmetrically formed in the chopping board, the chopping board can be rotatably and horizontally placed in the chopping board holes, the bottom surface of the chopping board is in contact with the top surface of the frame, the chopping board structure further comprises a driving sleeve, a driving block, a mandrel and a rotary driving unit, the rotary driving unit is vertically arranged and can be driven in a forward and reverse direction, the top flange of the rotary driving unit is connected to a driving mounting hole formed in the middle of a top plate of the frame, an output shaft of the rotary driving unit is connected with the driving block, a deflection guide hole groove is formed in a top disc of the driving block, the bottom end of the mandrel is slidably connected in the deflection guide hole, the driving sleeve is coaxially sleeved on the mandrel, and the driving sleeve drives the panel component to horizontally move.

Further, the bottom surface of the driving block top disc is coaxially provided with a shaft sleeve, and the shaft sleeve is connected to the output shaft of the rotary driving unit; and a jackscrew hole is formed in the side wall of the shaft sleeve, and jackscrews for propping up the output shaft of the rotary driving unit are connected with the jackscrew hole in a threaded manner.

Further, the inclined guide hole groove is an inclined circular arc through groove which is formed in the top disc of the driving block, and one end of the inclined guide hole groove is close to the edge of the top disc of the driving block, and the other end of the inclined guide hole groove is close to the shaft sleeve; the bottom of the mandrel is provided with a guide slider head which can be inserted into the inclined guide hole groove in a guide sliding manner.

Further, the upper portion of the mandrel is connected with the driving sleeve through a bearing, a central hole is formed in the center of the panel assembly, and the driving sleeve can be inserted into the central hole in a rotating fit mode.

Further, the rotary driving unit specifically adopts an electric motor or a hydraulic motor.

Further, the hole edges of the chopping block holes are arranged to be continuous sawtooth edges, and anti-skidding patterns are correspondingly formed on the side walls of the chopping block.

Further, the longitudinal sliding component comprises a longitudinal guide rod and a longitudinal sliding block, and the transverse sliding component comprises a transverse guide rod, a transverse sliding block and a supporting plate; the two longitudinal guide rods are horizontally arranged on two sides of the long side of the frame respectively, two ends of the longitudinal guide rods are connected to the side wall of the frame through lugs, and the four longitudinal sliding blocks are guided to slidingly connect the longitudinal guide rods; the vertical sliding blocks support the vertical transverse guide rods through the supporting plates, the four transverse sliding blocks are connected to the transverse guide rods in a guiding and sliding mode, and the transverse sliding blocks are fixedly connected to the bottom of the panel assembly.

Compared with the prior art, the utility model has the beneficial technical effects that:

According to the chopping board structure of the double-stroke notching machine, through the arrangement of the oblique guide hole grooves, the bottom end of the mandrel shifts and slides, different driving radiuses are obtained, the size of the circling radius of the driving sleeve is switched, the uniformity of the outer ring of the inner ring of the cutter mark on the chopping board is ensured, the service area of the chopping board is increased, and the replacement frequency is reduced. According to the chopping board structure of the double-stroke notching machine, two eccentric driving strokes are adopted to drive the panel assembly to move, so that the utilization rate of the area of the chopping board is improved, and the production cost is reduced.

In addition, the arrangement of the shaft sleeve and the jackscrew hole facilitates the realization of the rapid and effective connection of the rotary driving unit and the driving block; the inclined guide hole groove is arranged to be an inclined circular arc through groove, so that the guide core shaft can be smoothly guided, and the clamping stagnation is avoided. By arranging the bearing between the mandrel and the driving sleeve, the friction force between the mandrel and the driving sleeve is reduced, and excessive abrasion caused by sliding dry friction is avoided. Through the setting of sawtooth limit and chopping block lateral wall anti-skidding line, in the panel component horizontal migration process, the translation of chopping block can not only be realized to sawtooth limit push-and-pull contact chopping block lateral wall, can also realize the rotation of chopping block. The vertical sliding component and the horizontal sliding component are arranged through the guide rod and the sleeve type sliding block, so that the structure is simple, and the horizontal floating support of the panel component can be conveniently and rapidly realized in a low-cost manner.

Drawings

The utility model is further described with reference to the following description of the drawings.

FIG. 1 is a schematic diagram of a front view of a structure of a cutting board of a double-stroke notching machine;

FIG. 2 is a right-side view schematic diagram of the structure of the chopping board of the double-stroke notching machine;

FIG. 3 is a schematic diagram showing the structure of a chopping block of the double-stroke notching machine in a top view;

FIG. 4 is a schematic diagram of the structure of a chopping block of the double-stroke notching machine;

FIG. 5 is a schematic perspective view of a panel assembly according to the present utility model;

FIG. 6 is a schematic perspective view of the utility model with the panel assembly removed;

FIG. 7 is a schematic perspective view of a combination of a driving sleeve and a driving block according to the present utility model;

FIG. 8 is a schematic top view of a drive sleeve and drive block combination of the present utility model;

FIG. 9 is a schematic perspective view of a driving block according to the present utility model;

fig. 10 is a schematic perspective view of a driving sleeve according to the present utility model.

Reference numerals illustrate: 1. a frame; 101. driving the mounting hole; 2. a longitudinal slide assembly; 201. a longitudinal slide block; 3. a lateral sliding assembly; 301. a transverse slide block; 302. a support plate; 4. a panel assembly; 401. a central bore; 402. an anvil hole; 5. a motor; 6. a drive sleeve; 7. a driving block; 701. a deflection guide hole groove; 702. a shaft sleeve; 703. a top thread hole; 8. a mandrel; 801. a guide slider head; 9. cutting boards.

Detailed Description

The utility model aims at providing a chopping block structure of a double-stroke notching machine, which adopts two eccentric driving strokes to drive a panel assembly to move, thereby improving the utilization rate of the chopping block area and reducing the production cost.

The following description of the embodiments of the present utility model will be made in detail with reference to the accompanying drawings, wherein it is apparent that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Referring to the drawings, FIG. 1 is a schematic diagram showing the structure of a chopping block of a double-stroke notching machine according to the present utility model; FIG. 2 is a right-side view schematic diagram of the structure of the chopping board of the double-stroke notching machine; FIG. 3 is a schematic diagram showing the structure of a chopping block of the double-stroke notching machine in a top view; FIG. 4 is a schematic diagram of the structure of a chopping block of the double-stroke notching machine; FIG. 5 is a schematic perspective view of a panel assembly according to the present utility model; FIG. 6 is a schematic perspective view of the utility model with the panel assembly removed; FIG. 7 is a schematic perspective view of a combination of a driving sleeve and a driving block according to the present utility model; FIG. 8 is a schematic top view of a drive sleeve and drive block combination of the present utility model; FIG. 9 is a schematic perspective view of a driving block according to the present utility model; fig. 10 is a schematic perspective view of a driving sleeve according to the present utility model.

In one embodiment, as shown in fig. 1-10, the chopping board structure of the double-stroke notching machine of the present utility model comprises a frame 1, a longitudinal sliding component 2, a transverse sliding component 3, a panel component 4 and a chopping board 9. The panel assembly 4 can be horizontally and slidably stacked on the top surface of the frame 1 through the longitudinal sliding assembly 2 and the transverse sliding assembly 3, two anvil holes 402 are symmetrically formed in the anvil plate 9, the anvil plate 9 can be rotatably and horizontally placed in the anvil plate holes 402, the bottom surface of the anvil plate is in contact with the top surface of the frame 1, and the top surface of the anvil plate 9 is in contact with the punching cutter. The important difference between the chopping block structure and the prior art is that the chopping block structure also comprises a driving sleeve 6, a driving block 7, a mandrel 8 and a rotary driving unit. The rotary driving unit is vertically arranged and can be driven in a forward and reverse rotation two-way manner, the top flange of the rotary driving unit is connected to a driving mounting hole 101 formed in the middle of a top plate of the frame 1, an output shaft of the rotary driving unit vertically protrudes upwards and is in transmission connection with the driving block 7, a deflection guide hole groove 701 is formed in a top plate of the driving block 7, the bottom end of the mandrel 8 is slidably connected in the deflection guide hole groove 701, the driving sleeve 6 is coaxially sleeved on the mandrel 8, the driving sleeve 6 drives the panel assembly 4 to horizontally move, and the movement drives the panel assembly 4 to horizontally and longitudinally move in a combined mode for the circling movement of the driving sleeve 6.

Through the arrangement of the inclined guide hole groove 701, when the rotary driving unit rotates forward and outputs to the driving block 7, under the obstruction of friction damping, the bottom end of the mandrel 8 slides to one end, close to the axis line, of the inclined guide hole groove 701, the circle drawing radius of the driving sleeve 6 is small, the panel assembly 4 is driven to move in a small range, and the tool marks on the chopping board 9 are concentrated in the inner ring; when the rotary driving unit reversely outputs to the driving block 7, under the obstruction of friction damping, the bottom end of the mandrel 8 slides to one end, far away from the axis line, of the inclined guide hole groove 701, the circling radius of the driving sleeve 6 is large, the panel assembly 4 is driven to move in a large range, and the tool marks on the chopping block 9 are concentrated on the outer ring. Namely, through the arrangement of the inclined guide hole groove 701, the bottom end of the mandrel 8 shifts and slides to obtain different driving radiuses, so that the size of the circling radius of the driving sleeve 6 is switched, the uniformity of the outer ring of the inner ring of the cutter mark on the cutting board 9 is ensured, the use area of the cutting board 9 is increased, and the replacement frequency is reduced. According to the chopping board structure of the double-stroke notching machine, two eccentric driving strokes are adopted to drive the panel assembly to move, so that the utilization rate of the area of the chopping board is improved, and the production cost is reduced.

In a specific embodiment of the present utility model, as shown in fig. 7 and 9, the top disk bottom surface of the driving block 7 is coaxially provided with a shaft sleeve 702, the shaft sleeve 702 is vertically arranged, and the shaft sleeve 702 is connected to the output shaft of the rotary driving unit. The side wall of the shaft sleeve 702 is provided with jackscrew holes 703, the number of the jackscrew holes 703 is more than two and the jackscrew holes 703 are positioned on the same vertical side line position, and jackscrews for propping up the output shaft of the rotary driving unit are connected in the jackscrew holes 703 through internal threads. The inner end head of the jackscrew is tightly propped in the flat key groove of the output shaft of the rotary driving unit.

Specifically, as shown in fig. 7 to 9, the inclined guide hole groove 701 is an inclined circular arc through groove formed in the top plate of the driving block 7, and one end of the inclined guide hole groove 701 is located near the shaft sleeve 702 and the other end is located near the edge of the top plate of the driving block 7. The bottom of the mandrel 8 is provided with a guide slider head 801, the guide slider head 801 is in a flat bar shape, and two sides of the flat bar are in sliding contact with the side wall of the inclined guide hole groove 701. The guide slider head 801 is guided slidably inserted into the offset guide hole groove 701.

By arranging the shaft sleeve 702 and the jackscrew hole 703, the quick and effective connection of the rotary driving unit and the driving block 7 is convenient to realize; by setting the inclined guide hole groove 701 as an inclined circular arc through groove, the mandrel 8 can be guided smoothly, and no jamming is generated.

In one embodiment of the present utility model, as shown in fig. 5 and 6, the upper portion of the mandrel 8 is connected to the driving sleeve 6 through a deep groove ball bearing, the panel assembly 4 is centrally provided with a central hole 401, and the driving sleeve 6 is rotatably inserted into the central hole 401.

By arranging the bearing between the mandrel 8 and the driving sleeve 6, the friction force between the mandrel and the driving sleeve 6 is reduced, and excessive abrasion caused by sliding dry friction is avoided.

In a specific embodiment of the utility model, as shown in fig. 1 and 2, the rotary drive unit is embodied as an electric motor 5 or a hydraulic motor. The motor 5 is a servo motor with a reduction gearbox, and a driver of the servo motor is electrically connected to a controller of the equipment electric control box.

Obviously, the rotary driving unit may also adopt a gear-rack structure, and the electric push rod is utilized to drive the rack to linearly reciprocate to rotate at the driving gear, and the output shaft of the gear is connected to the shaft sleeve 702. The reciprocating motion of the electric push rod is converted into the forward and reverse rotation of the gear. Similar structural forms are also within the scope of the utility model.

In one embodiment of the utility model, as shown in FIGS. 1-3, the edges of the anvil holes 402 are configured as continuous serrated edges, and the sidewalls of the anvil 9 are correspondingly textured.

Through the setting of sawtooth limit and chopping block 9 lateral wall anti-skidding line, in the panel component 4 horizontal migration process, the translation of chopping block 9 can not only be realized to sawtooth limit push-and-pull contact chopping block 9 lateral wall, can also realize the rotation of chopping block 9.

In one embodiment of the present utility model, as shown in fig. 1 to 6, the longitudinal sliding assembly 2 includes a longitudinal guide bar and a longitudinal slider 201, and the lateral sliding assembly 3 includes a lateral guide bar, a lateral slider 301, and a support plate 302. Two longitudinal guide rods are horizontally arranged on two sides of the long side of the frame 1 respectively, two ends of the two longitudinal guide rods are connected to the side wall of the frame 1 through lugs, and four longitudinal sliding blocks 201 are guided to slidingly connect the longitudinal guide rods (part of the longitudinal guide rods is omitted in fig. 6, only two longitudinal sliding blocks 201 are shown and cannot be regarded as defects). The longitudinal sliding blocks 201 are arranged at two ends of the frame 1 in pairs, the outer sides of the longitudinal sliding blocks 201 are connected with the supporting plates 302 through bolts, the upward bending heads of the supporting plates 302 support vertical transverse guide rods, and the transverse guide rods are arranged at the outer sides of short sides of the frame 1. Four transverse sliding blocks 301 are connected to the transverse guide rods in a guiding and sliding manner, and the four transverse sliding blocks 301 are respectively arranged on the two transverse guide rods in a group. The transverse slider 301 is fixedly connected to the bottom of the panel assembly 4.

It is obvious that the longitudinal sliding component 2 and the transverse sliding component 3 can also be realized by adopting a linear guide rail, a ball sliding block, a guide groove, a convex sliding block and the like, and similar simple structural deformation modes fall into the protection scope of the utility model.

The longitudinal sliding component 2 and the transverse sliding component 3 are arranged through the guide rod and the sleeve type sliding block, so that the structure is simple, and the horizontal floating support of the panel component 4 can be conveniently and quickly realized in an erection mode at low cost.

The utility model relates to a double-stroke notching machine cutting board structure theory of operation: the equipment electric cabinet controller controls the motor 5 to switch forward rotation and reverse rotation at regular time. When the motor 5 rotates positively and is output to the driving block 7, under the obstruction of friction damping, the bottom end of the mandrel 8 slides to one end of the inclined guide hole groove 701, which is close to the axis, and the driving block 7 continues to rotate to drive the mandrel 8 to rotate along a circle at the position of the inner end of the inclined guide hole groove 701. At this time, the radius of the circling of the driving sleeve 6 is small, the panel assembly 4 which is supported by the longitudinal sliding assembly 2 and the transverse sliding assembly 3 in a suspending way is pushed and pulled by the driving sleeve 6 to perform the transverse and longitudinal compound movement within a small range, and the tool marks on the chopping board 9 are concentrated on the inner ring. When the motor 5 reversely outputs to the driving block 7, under the obstruction of friction damping, the bottom end of the mandrel 8 slides to one end of the inclined guide hole groove 701 far away from the axis, and the driving block 7 continuously rotates to drive the mandrel 8 to rotate around the outside end of the inclined guide hole groove 701. At this time, the circling radius of the driving sleeve 6 is large, the panel assembly 4 is driven to move in a large range in a transverse and longitudinal combined mode, and the tool marks on the chopping board 9 are concentrated on the outer ring.

According to the chopping board structure of the double-stroke notching machine, through the arrangement of the inclined guide hole groove 701, the bottom end of the mandrel 8 shifts and slides to obtain different driving radiuses, the size switching of the circling radius of the driving sleeve 6 is realized, the uniformity of the outer ring of the inner ring of the cutter mark on the chopping board 9 is ensured, the use area of the chopping board 9 is increased, and the replacement frequency is reduced. According to the chopping board structure of the double-stroke notching machine, two eccentric driving strokes are adopted to drive the panel assembly to move, so that the utilization rate of the area of the chopping board is improved, and the production cost is reduced. Furthermore, by the arrangement of the shaft sleeve 702 and the jackscrew hole 703, a quick and effective connection of the rotary drive unit and the drive block 7 is facilitated; by setting the inclined guide hole groove 701 as an inclined circular arc through groove, the mandrel 8 can be guided smoothly, and no jamming is generated. By arranging the bearing between the mandrel 8 and the driving sleeve 6, the friction force between the mandrel and the driving sleeve 6 is reduced, and excessive abrasion caused by sliding dry friction is avoided. Through the setting of sawtooth limit and chopping block 9 lateral wall anti-skidding line, in the panel component 4 horizontal migration process, the translation of chopping block 9 can not only be realized to sawtooth limit push-and-pull contact chopping block 9 lateral wall, can also realize the rotation of chopping block 9. The longitudinal sliding component 2 and the transverse sliding component 3 are arranged through the guide rod and the sleeve type sliding block, so that the structure is simple, and the horizontal floating support of the panel component 4 can be conveniently and quickly realized in an erection mode at low cost.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.

The above embodiments are only illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model should fall within the protection scope defined by the claims of the present utility model without departing from the design spirit of the present utility model.

Claims (7)

1. The utility model provides a two stroke mouth punching machine chopping block structure, includes frame (1), longitudinal sliding assembly (2), transverse sliding assembly (3), panel subassembly (4) and chopping block (9), panel subassembly (4) are passed through longitudinal sliding assembly (2) and transverse sliding assembly (3) can the horizontal slip stack be in on the top surface of frame (1), the symmetry is provided with two chopping block holes (402) on chopping block (9), chopping block (9) rotatable lie in chopping block hole (402) and bottom surface with frame (1) top surface contact, a serial communication port, still include drive sleeve (6), drive piece (7), dabber (8) and rotary drive unit, rotary drive unit top flange joint is in on drive mounting hole (101) that frame (1) roof offered in the middle, rotary drive unit output shaft connection drive piece (7) has seted up deflection groove (701) on the roof plate, dabber (8) bottom sliding connection is in chopping block (402) and bottom surface contact with frame (1) top surface contact, still include drive sleeve (6), rotary drive unit top flange joint is in the drive sleeve (6) is in the coaxial guide hole (6), drive sleeve (4) is cup jointed.

2. The dual stroke notching machine anvil structure of claim 1 wherein: the bottom surface of the top disc of the driving block (7) is coaxially provided with a shaft sleeve (702), and the shaft sleeve (702) is connected to the output shaft of the rotary driving unit; and a jackscrew hole (703) is formed in the side wall of the shaft sleeve (702), and jackscrews for propping up the output shaft of the rotary driving unit are connected with the jackscrew hole (703) in an internal thread manner.

3. The dual stroke notching machine anvil structure of claim 2 wherein: the inclined guide hole groove (701) is an inclined circular arc through groove and is formed in a top disc of the driving block (7), one end of the inclined guide hole groove (701) is close to the other end of the shaft sleeve (702) and is close to the edge of the top disc of the driving block (7); the bottom of the mandrel (8) is provided with a guide slider head (801), and the guide slider head (801) can be inserted into the inclined guide hole groove (701) in a guide sliding manner.

4. The dual stroke notching machine anvil structure of claim 1 wherein: the upper portion of the mandrel (8) is connected with the driving sleeve (6) through a bearing, a central hole (401) is formed in the center of the panel assembly (4), and the driving sleeve (6) can be inserted into the central hole (401) in a rotating fit mode.

5. The dual stroke notching machine anvil structure of claim 1 wherein: the rotary driving unit specifically adopts an electric motor (5) or a hydraulic motor.

6. The dual stroke notching machine anvil structure of claim 1 wherein: the hole edge of the chopping board hole (402) is arranged to be a continuous sawtooth edge, and anti-skidding patterns are correspondingly formed on the side wall of the chopping board (9).

7. The dual stroke notching machine anvil structure of claim 1 wherein: the longitudinal sliding assembly (2) comprises a longitudinal guide rod and a longitudinal sliding block (201), and the transverse sliding assembly (3) comprises a transverse guide rod, a transverse sliding block (301) and a supporting plate (302); the two longitudinal guide rods are horizontally arranged at two sides of the long side of the frame (1) respectively, two ends of the longitudinal guide rods are connected to the side wall of the frame (1) through lugs, and the four longitudinal sliding blocks (201) are connected with the longitudinal guide rods in a guiding and sliding manner; the longitudinal sliding blocks (201) support the vertical transverse guide rods through the supporting plates (302), the four transverse sliding blocks (301) are connected to the transverse guide rods in a guiding sliding mode, and the transverse sliding blocks (301) are fixedly connected to the bottom of the panel assembly (4).