JP7150367B1 - lifter - Google Patents

Abstract

Kind Code: A1 A simple structure capable of quickly ascertaining the damage, etc. of a part and preventing the occurrence of a serious accident resulting in injury or death by stopping the lifting and lowering of a container holder when a part constituting a power transmission part is damaged, etc. of lifters. A lifter (1) includes left and right columns (2a, 2b) and a container holder (5) arranged between the left and right columns to hold a container, and screw shafts (7) are rotatable in the left and right columns. A screw nut 8 connected to the container holder is screwed to the screw shaft, and the container holder is moved up and down by rotation of the screw shaft. A boss 27 is provided on the side surface of the container holder 5 , and a support shaft 37 fitted into the center hole of the boss 27 is provided on the outer peripheral surface of the nut housing 32 attached to the screw nut 8 . . [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to a lifter, and more particularly to a lifter that raises and lowers a container holder by rotating a screw shaft.

A bread dough lifter is generally used for conveying bread dough to a dividing machine or a mixer in a preparation area according to the dough method (see, for example, Patent Document 1, etc.). This bread dough lifter includes left and right columns (main columns) and container holders arranged between the left and right columns to hold containers. is rotatably provided, and a screw nut (female thread) connected to the container holder is screwed to the screw shaft, and the rotation of the screw shaft raises and lowers the container holder. . In this type of bread dough lifter, for example, as shown in FIG. 9, a pair of support shafts 137 are provided on the outer peripheral surface of a nut housing 132 attached to a screw nut 108, and the pair of support shafts 137 have a U-shaped cross section. The upper end of the link member 152 is supported by the support member 151 and the lower end of the link member 152 is supported by the side surface of the container holder 105 in many cases. In other words, the screw nut 108 is connected to the container holder 105 by a pair of support shafts 137 so as to be supported on both sides. Thereby, the container holder 105 can be smoothly moved up and down.

JP-A-07-75478

However, in the conventional bread dough lifter, the screw nut 108 is connected to the container holder 105 by a pair of support shafts 137 in a state of being both held, so that the power of the motor is transmitted to the screw shafts 107 of the left and right columns. When a part (for example, a tire coupling, a speed reducer, etc.) that constitutes the power transmission section is damaged, and the power of the motor is transmitted only to one of the screw shafts 107, the left and right screw shafts 107, that is, stop Even if there is a difference in height between the screw nuts 108 of the shaft 107 and the operating shaft 107, it is difficult to apply a bending moment to each screw nut 108, and only a vertical load is applied. As a result, there is a possibility that the damage or the like of the parts constituting the power transmission portion cannot be quickly grasped, and a serious accident resulting in injury or death may occur.

Further, conventional bread dough lifters often employ a screw shaft provided with two trapezoidal screws or square screws with a lead of 24 mm or less. In this case, the proper lifting speed of the container holder cannot be ensured unless the rotation of the screw shaft is increased. Therefore, the rotation of the screw shaft is fast and the impact at the time of operation and stop is large, and lubricating oil (specifically, lubricating oil in the reduction gear that constitutes the power transmission part) and grease (specifically, the screw shaft and screw nut) Grease applied to the screw shaft, grease in the bearing case that supports the screw shaft in a suspended state, etc.) are likely to scatter around. Therefore, it is essential to provide a cover for preventing foreign substances such as lubricating oil and grease from scattering, and to control the motor by inverter to adjust the speed at which the screw shaft starts and stops rotating. On the other hand, even if the lead is simply lengthened, the container holder may drop due to its own weight when the motor is stopped during maintenance work or the like. Furthermore, the frictional resistance increases when the container holder moves up and down.

Here, it is known that a roller chain is used as a lift (lifter) for conveying bread dough to a mixer or a dividing machine according to the domestic seed method. A lift using this roller chain requires replacement of the chain on a short and regular basis, so installation and replacement work are the basics of assembly and maintenance work. However, since the chain is electrically operated by meshing, it can be operated electrically regardless of whether it is worn or has a lot of slack, so it tends to be adjusted haphazardly. If this happens, troubles such as premature wear, chain breakage, chain winding, etc. will occur even if the chain is replaced with a new one, and the machine will stop. Furthermore, a pin diameter of several millimeters lacks a safety factor in terms of strength against impact and the like. Therefore, a roller chain lift is unsuitable for the medium seed method for lifting several hundred kilograms in the bakery industry, and a screw type lift should be used.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned current situation, and by stopping the lifting and lowering of the container holder when the parts constituting the power transmission section are damaged, it is possible to quickly grasp the damage of the parts and prevent serious damage. To provide a lifter with a simple structure capable of preventing accidents resulting in injury or death.
In addition to the above objects, the present invention can prevent foreign matter such as lubricating oil and grease from scattering, preventing foreign matter from entering the raw material in the container, and preventing the container holder from dropping due to its own weight when the motor is stopped. It is another object of the present invention to provide a lifter capable of suppressing frictional resistance during lifting and lowering of a container holder.

The present invention is as follows.
1. Left and right columns, and container holders arranged between the left and right columns to hold containers, screw shafts are rotatably provided in the left and right columns, and the screw shafts are provided with: A screw nut connected to the container holder is screwed, and the lifter lifts and lowers the container holder by rotation of the screw shaft,
A boss is provided on a side surface of the container holder,
A lifter, wherein a support shaft that is fitted into a center hole of the boss is provided on an outer peripheral surface of a nut housing that is attached to the screw nut.
2. 1. The apparatus according to 1 above, wherein the length of insertion of the support shaft into the boss is 80 to 120 mm. lifter described in .
3. 1. The screw shaft according to 1 above, wherein the screw shaft has two trapezoidal threads or square threads, and the lead of the trapezoidal threads or the square threads is 26 to 30 mm. or 2. lifter described in .
4. The above 1. for bread dough. to 3. A lifter according to any one of the preceding paragraphs.

According to the lifter of the present invention, the boss is provided on the side surface of the container holder, and the support shaft that fits into the center hole of the boss is provided on the outer peripheral surface of the nut housing attached to the screw nut. As a result, the screw nut is connected to the container holder in a cantilevered state, so even if the parts that make up the power transmission section are damaged, the power of the motor will be transmitted only to one of the screw shafts in the left and right columns. In such a situation, the left and right screw shafts, i.e., the screw nuts on the stop shaft and the operation shaft, have a difference in height, and a bending moment is applied to each screw nut. be done. As a result, it is possible to quickly grasp the damage of the parts constituting the power transmission section, and to prevent serious accidents resulting in injury or death.

Further, when the length of the support shaft inserted into the boss is 80 to 120 mm, if the length of insertion is 80 mm or more, looseness is less likely to occur between the boss and the support shaft, and only one of the screw shafts is attached to the motor. power is transmitted, a bending moment is effectively applied to each screw nut of the left and right screw shafts. On the other hand, if the fitting length is within 120 mm, the space between the left and right columns can be reduced while ensuring a sufficient width of the container holder.

Further, the screw shaft has two trapezoidal threads or square threads, and when the lead of the trapezoidal threads or the square threads is 26 to 30 mm, the rotation of the screw shaft is slowed down if the lead is 26 mm or more. However, it is possible to secure an appropriate lifting speed of the container holder, suppress the scattering of foreign matter such as lubricating oil and grease due to the rotation and stop of the screw shaft, and prevent contamination of the raw material in the container with foreign matter. On the other hand, if the lead is 30 mm or less, the lead is not too long, so that the container holder can be prevented from dropping due to its own weight when the motor is stopped during maintenance work or the like. Furthermore, it is possible to suppress frictional resistance when the container holder is moved up and down.

The present invention will be further described in the following detailed description by way of non-limiting examples of exemplary embodiments according to the invention and with reference to the mentioned drawings, wherein like reference numerals indicate Similar parts are shown throughout the several figures.
1 is an exploded perspective view of a bread dough lifter according to an embodiment; FIG. FIG. 2 is an enlarged view of a main part (disassembled state) of FIG. 1; FIG. 2 is an enlarged view of a main portion (assembled state) of FIG. 1; FIG. 4 is a cross-sectional view of a portion including a connecting portion of the container holder to the screw nut according to the embodiment; It is a principal part side view of the screw shaft which concerns on embodiment. FIG. 4 is an explanatory view of the operation of the bread dough lifter, in which (a) shows a state in which the dough box is advanced toward the container holder, (b) shows a state in which the dough box is held by the container holder, and (c) shows the container. The holder is in the middle of rising, and (d) shows the container holder turned over on the rising end side. FIG. 4 is an explanatory view of the operation of the bread dough lifter; FIG. 3 is a cross-sectional view of essential parts of a bread dough lifter according to a comparative example; FIG. 10 is an explanatory diagram for explaining a conventional bread dough lifter;

The material presented herein is intended to be illustrative and illustrative of the embodiments of the invention and is believed to be the most effective and readily understood description of the principles and conceptual features of the invention. It is stated for the purpose of providing what it seems. In this regard, no attempt is made to show structural details of the invention beyond those necessary for a fundamental understanding of the invention, and the description in conjunction with the drawings will illustrate some aspects of the invention. It will be clear to those skilled in the art how it is actually implemented.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be specifically described by way of embodiments with reference to the drawings. In this embodiment, as the "lifter" according to the present invention, a bread dough lifter 1 for conveying bread dough to a dividing machine or a mixer in a preparation area according to the sponge dough method is exemplified (see FIG. 1). Further, a screw shaft structure S including a screw shaft (main shaft or male thread) 7 and a screw nut (female thread) 8 screwed onto the screw shaft 7 is illustrated (see FIG. 3).

As shown in FIGS. 1 to 3, the bread dough lifter 1 according to the present embodiment is arranged between left and right columns (main columns) 2a and 2b and left and right columns 2a and 2b. and a container holder 5 for holding a container (exemplified as a “container” according to the invention, see FIG. 6). A vertically extending screw shaft 7 is rotatably provided on each of these columns 2a and 2b. A screw nut 8 connected to the container holder 5 is screwed onto the screw shaft 7 . By transmitting the power of the motor 10 to the screw shaft 7 via the power transmission section 9 to rotate the screw shaft 7, the container holder 5 is moved up and down together with the screw nut 8 (see FIG. 6).

The left and right columns 2a, 2b are formed in the shape of hollow columns extending in the vertical direction (see FIG. 4). Each of these columns 2a and 2b is vertically spaced apart from each other. Each column 2a, 2b includes a bearing case 11 that supports the upper portion of the screw shaft 7 in a suspended state, and a flange unit 12 that supports the lower portion of the screw shaft 7. As shown in FIG. This bearing case 11 is attached to a bracket 13 fixed to each column 2a, 2b. Furthermore, two radial bearings and one thrust bearing are provided in the bearing case 11, and high-viscosity grease is enclosed by an oil seal. This grease may leak out of the bearing case 11 when the oil seal is damaged or its viscosity decreases due to deterioration or heat.

In FIG. 1, in the left column 2a, descriptions of the screw shaft 7, the bearing case 11, the flange unit 12, etc. described in the right column 2b are omitted, and in the right core ram 2b, descriptions thereof are described in the left column 2a. Descriptions of the screw nut 8, the guide portion 21, and the like are omitted. Furthermore, reference numeral "25" in FIG. 1 indicates a chute for transferring bread dough toward a divider or mixer (not shown).

The container holder 5 can hold the container from the open front. The container holder 5 includes left and right side plates 16 , a rear plate 17 bridged between the left and right side plates 16 , and a substantially L-shaped support plate 18 provided inside each side plate 16 . An arm 19 is supported on the outer surface of each side plate 16 so as to be swingable about a horizontal axis. A safety bar 20 is attached between these arms 19 to prevent the do-box 4 transferred onto the container holder 5 from jumping forward.

A guide portion 21 for guiding the vertical movement of the container holder 5 is provided on the outer surface of each side plate 16 . The guide portion 21 includes a guide shaft 22 and a guide roller 23 supported by the guide shaft 22 . The guide rollers 23 roll along guide surfaces 24 (see FIG. 4) provided on the columns 2a and 2b as the container holder 5 moves up and down. As a result, the container holder 5 is moved up and down, and is turned upside down with a supporting shaft 37, which will be described later, as a fulcrum on the rising end side (see FIG. 6). Furthermore, the outer peripheral surface of the guide roller 23 is lined with urethane resin or the like to prevent lateral vibration.

A side surface of the container holder 5 (specifically, an outer side surface of the side plate 16) is provided with a boss 27 having a central hole 27a into which a support shaft 37, which will be described later, is fitted. The boss 27 is arranged so that its axis is along the direction A in which the left and right columns 2a and 2b are arranged (direction A in which the boss 27 and the support shaft 37 face each other) (see FIG. 4). Furthermore, the boss 27 is made of a metal that is softer and more wear-resistant than the support shaft 37 (for example, gunmetal (BC, PBC), etc.).

The screw shaft 7 has two trapezoidal threads or square threads (see FIG. 5). A lead L of 26 to 30 mm (preferably 26 to 28 mm) can be adopted for the trapezoidal screw and square screw. More specifically, the trapezoidal thread or square thread has a pitch P of 13 mm, a lead L of 26 mm, and an outer diameter D of 60 mm. Furthermore, high-viscosity grease is applied to the screw shaft 7 and a screw nut 8, which will be described later. This grease is desirably replenished (reapplied) periodically because its viscosity decreases and dust adheres to it due to deterioration.

A nut housing 32 is attached to the screw nut 8 so as to cover the outer circumference of the screw nut 8 . The screw nut 8 has two trapezoidal threads or square threads having a lead corresponding to the screw shaft 7 . Moreover, the nut housing 32 is for preventing the scattering of grease from the screw nut 8 and the entry of dust. Furthermore, on the nut housing 32, a horseshoe-shaped plate 33 and a nut guide 34 are attached in this order to prevent lateral vibration.

A support shaft 37 is provided on the outer peripheral surface of the nut housing 32 so as to be fitted into the center hole 27a of the boss 27 and pivotally supported. The support shaft 37 extends along the direction A in which the left and right columns 2a and 2b are arranged (see FIG. 4). Further, the fitting length L1 of the support shaft 37 with respect to the boss 27 can be 80 to 120 mm (preferably 90 to 110 mm). More specifically, the fitting length L1 is 94 mm. Furthermore, the support shaft 37 is passed through a guide wheel 38 for absorbing lateral impacts on the screw shaft 7 . The guide wheel 38 is made of a metal (for example, gunmetal (BC, PBC), etc.) that is softer than the support shaft 37 and has excellent wear resistance. Further, a gap 39 is provided on the tip side of the support shaft 37 fitted into the boss 27 to absorb lateral movement of the container holder 4 .

The power transmission section 9 transmits the power of one motor 10 to the screw shafts 7 of the left and right columns 2a and 2b. The power transmission portion 9 is arranged on a support portion 41 that spans the upper ends of the left and right columns 2a and 2b. The power transmission unit 9 also includes an upstream reduction gear 43 , a downstream reduction gear 44 , and a drive shaft 45 arranged between the reduction gears 43 and 44 . An input shaft 43 a of the speed reducer 43 on the upstream side is connected to the drive shaft of the motor 10 via a tire coupling 46 . The output shaft 43 b of the upstream speed reducer 43 is connected to the upper end of the screw shaft 7 via a chain coupling 47 . A coupling case 48 is attached to the chain coupling 47 to prevent grease from scattering and dust from entering. Furthermore, a sprocket 50 to which a chain 49 is connected is attached to the output shaft 43c of the reduction gear 43 on the upstream side. This chain 49 is used to detect the number of revolutions of the screw shaft 7 (that is, the vertical position of the container holder 5). Further, low-viscosity lubricating oil is sealed in the reduction gears 43 and 44 by double oil seals. This lubricating oil may leak out of the reduction gears 43 and 44 due to damage to the oil seals. Further, the reduction gears 43 and 44 are provided with air bleeding valves for bleeding air when the lubricating oil becomes hot.

The drive shaft 45 is rotatably supported around a horizontal axis by a plurality of pillow units 51 . One end of the drive shaft 45 is connected to the output shaft 43d of the reduction gear 43 on the upstream side through a tire coupling 46, and the other end of the drive shaft 45 is connected to the output shaft 43d of the reduction gear 44 on the downstream side through a tire coupling 46. It is connected with the input shaft 44a. The output shaft 44 b of the downstream speed reducer 44 is connected to the upper end of the screw shaft 7 via a chain coupling 47 .

The bread dough lifter 1 is equipped with a human sensor (not shown) for detecting incorrect positioning of the worker. Abnormality is notified by screen display or the like. Furthermore, when the operation procedure by the operator is different from the proper procedure (for example, forgetting to put on the safety bar 20, etc.), the bread dough lifter 1 can provide voice, screen display, etc. so that the operation by the operator will be the proper procedure. (for example, guidance such as "Please hang the safety bar 20").

Next, the function and effect of the bread dough lifter 1 having the above configuration will be described. First, the dough box 4 containing bread dough is advanced with respect to the container holder 5 located at the lower end (see FIG. 6(a)). Next, the safety bar 20 is lowered to allow the container holder 5 to hold the do box 4 (see FIG. 6(b)). Next, the power of the motor 10 is transmitted through the power transmission section 9 to rotate the screw shaft 7 to raise the container holder 5 (see FIG. 6(c)). On the ascending end side of the container holder 5, the guide portion 21 rolls on the guide surface 24 (curved surface portion) so that the container holder 5 is turned upside down, and the bread dough in the dough box 4 passes through the chute 25 into a divider or a mixer. (see FIG. 6(d)). After that, the empty do box 4 is taken out from the container holder 5 by lowering the container holder 5 to the lower end and removing the safety bar 20 in the reverse order of the above action.

In the bread dough lifter 1, as a safety measure, the container holder 5 is stopped in the middle before it is turned over when it is lifted. Further, the container holder 5 is stopped in the middle during its descent, and the subsequent descent is performed by a manual switch. Furthermore, an alarm device is activated when the container holder 5 is lowered.

Here, when the parts (for example, the tire coupling 46, the reduction gears 43, 44, etc.) that constitute the power transmission section 9 are damaged, the motor 10 is connected to only one of the screw shafts 7 in the left and right columns 2a, 2b. power is transmitted. For example, as shown in FIG. 7, when the container holder 5 is raised, the left screw shaft 7 is the stopping shaft and the right screw shaft 7 is the operating shaft. Since a bending moment M is applied to each screw nut 8 due to the height difference, the container holder 5 is stopped in a state of being inclined with respect to the horizontal. The angle of inclination of the container holder 5 with respect to the horizontal is within 15 degrees depending on the state of wear of the screw nut 8 .

As described above, according to the bread dough lifter 1 of the present embodiment, the boss 27 is provided on the side surface of the container holder 5, and the center hole of the boss 27 is provided on the outer peripheral surface of the nut housing 32 attached to the screw nut 8. A support shaft 37 is provided to be fitted into 27a. As a result, since the screw nut 8 is connected to the container holder 5 in a cantilevered state, even if the parts constituting the power transmission section 9 are damaged, only one of the screw shafts 7 in the left and right columns 2a and 2b can be removed. When the power of the motor 10 is transmitted to the left and right screw shafts 7, that is, the screw nuts 8 of the stop shaft 7 and the operation shaft 7 have a difference in height, and a bending moment is applied to each screw nut 8. , the container holder 5 is stopped in a state inclined with respect to the horizontal. As a result, it is possible to quickly grasp the damage or the like of the parts constituting the power transmission section 9, and prevent serious accidents resulting in injury or death.

Further, in this embodiment, the length L1 of fitting the support shaft 37 into the boss 27 is 80 to 120 mm. If the fitting length L1 is 80 mm or more, looseness is less likely to occur between the boss 27 and the support shaft 37, and in a situation where the power of the motor 10 is transmitted to only one of the screw shafts 7, each of the left and right screw shafts 7 can be secured. A bending moment M is effectively acted on the screw nut 8 . On the other hand, if the fitting length L1 is within 120 mm, the width of the container holder 5 can be sufficiently secured while the distance between the left and right columns 2a and 2b can be reduced.

In this embodiment, the screw shaft 7 has two trapezoidal threads or square threads, and the lead L of the trapezoidal threads or square threads is 26 to 30 mm. If the lead L is 26 mm or more, even if the rotation of the screw shaft 7 is slowed down, an appropriate lifting speed of the container holder 5 can be ensured, and the rotation and stop of the screw shaft 7 will cause lubricating oil (specifically, the power transmission part 9 Lubricating oil in the speed reducers 43 and 44 that constitute the ) and grease (specifically, grease applied to the screw shaft 7 and the screw nut 8, grease in the bearing case 11 that supports the screw shaft 7 in a suspended state . On the other hand, if the lead L is within 30 mm, the lead L is not too long, so that the container holder 5 can be prevented from dropping by its own weight when the motor is stopped during maintenance work or the like. Furthermore, the frictional resistance when the container holder 5 moves up and down can be suppressed.

Furthermore, in this embodiment, it is necessary to increase the frequency of replenishment of grease and leveling work compared to the conventional bread dough lifter (see FIG. 9). It is possible to easily grasp the necessity of replenishment of water and leveling work.

Here, as a bread dough lifter 101 according to a comparative example, as shown in FIG. A form in which a support shaft 137 is fitted into is provided. In this form, it is necessary to attach the boss 127 having a large outer diameter to the outer peripheral surface of the nut housing 132 by welding or the like, and the attachment of the boss 127 is deteriorated compared to the present bread dough lifter 1 . In addition, it is necessary to provide a space in the left and right columns 102a and 102b for the bosses 127 to pass when the container holder 105 is lifted and lowered, and the strength of the columns 102a and 102b is lower than that of the dough lifter 1 of the present invention.

It should be noted that the present invention is not limited to the above-described embodiment, and can be variously modified within the scope of the present invention according to the purpose and application. That is, in the above-described embodiment, the bread dough lifter 1 for conveying bread dough to the next process was exemplified as the lifter according to the present invention, but it is not limited to this, and for example, pasty food materials other than bread dough and rubber materials It may be used as a paste-like material lifter for conveying such as to the next process.

Furthermore, in the above-described embodiment, the container (do-box) 4 with wheels is illustrated, but the present invention is not limited to this, and a container without wheels, for example, may be used.

INDUSTRIAL APPLICABILITY The present invention is widely used as a technique for raising and lowering container holders.

1 Dough lifter 2a, 2b Left and right columns 4 Do box (container) 5 Container holder 7 Screw shaft 8 Screw nut 27 Boss 27a Center hole 32 Nut housing , 37; support shaft, L; lead, L1; insertion length, S; screw shaft structure.

Claims (4)

Left and right columns, and container holders arranged between the left and right columns to hold containers, screw shafts are rotatably provided in the left and right columns, and the screw shafts are provided with: A screw nut connected to the container holder is screwed together, and the power transmission unit transmits the power of one motor to the screw shafts of the left and right columns, and rotates the screw shafts to move the container holder. A lifter that raises and lowers,
A boss is provided on a side surface of the container holder,
A support shaft fitted into the center hole of the boss is provided on the outer peripheral surface of the nut housing attached to the screw nut ,
an insertion length of the support shaft with respect to the boss is 80 to 120 mm;
In a situation where the power of the motor is transmitted only to one of the screw shafts in the left and right columns when the parts constituting the power transmission section are damaged, the container holder is stopped in a state of being tilted with respect to the horizontal. A lifter characterized by: 2. The lifter according to claim 1, wherein the screw shaft has two trapezoidal threads or square threads, and the lead of the trapezoidal threads or the square threads is 26 to 30 mm. 3. The lifter according to claim 1 , which is for bread dough. The support shaft is inserted through a guide wheel for absorbing a lateral impact on the screw shaft,
the guide wheel is disposed between the nut housing and the boss;
4. A lifter according to any one of claims 1 to 3, wherein said guide wheels and said bosses are made of a softer metal than said support shaft.

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