Conveying device and adjusting method of conveying device

Abstract

[Problem] To achieve a conveying device and the like capable of shortening the time required for adjusting the position of a pulley. [Solution] A transport device (1) is provided with: a pulley (41) around which a conveyor belt (30) for moving a carriage (20) up and down is wound; a shaft (42) into which the pulley is embedded; a collar (45) embedded in the shaft; and a gasket (46) inserted into the shaft, the gasket having an open loop portion, the position of the pulley in the axial direction of the shaft being determined by the collar and the gasket.

Description

Technical Field

[0001] The invention relates to a conveying device and an adjusting method of the conveying device. Background Art

[0002] Conventionally, there is known a conveying device such as a stacker crane that carries articles on a lifting platform that is raised and lowered along a mast (pillar), as disclosed in Patent Document 1. In the stacker crane, a lifting drive mechanism for lifting and lowering the lifting platform has a drive pulley that uses a driving force from a lifting drive motor to freely move a sling forward and backward. Prior art literature Patent Literature

[0003] [Patent Document 1] Japanese Patent No. 5983752 Summary of the invention Problem that the invention aims to solve

[0004] When assembling the conveyor, the position of the drive pulley and the position of the belt may deviate due to deformation during belt manufacturing. In this case, if the conveyor belt touches the edge of the drive pulley, the conveyor belt may break, so the position of the drive pulley needs to be adjusted to match the position of the conveyor belt connected to the lift table. In the past, in order to adjust the position of the drive pulley, it was necessary to remove the drive pulley from the lift drive motor, which had the problem of taking a lot of time.

[0005] The present invention realizes a conveying device and the like capable of shortening the time required for adjusting the position of a pulley. Technical means of solving problems

[0006] The cam is an axially movable member which is adapted to move the belt pulleys relative to the bearing units and to allow the belt pulleys to move relative to the bearing units when the cam is in motion.

[0007] In addition, a conveying device adjustment method according to one embodiment of the present invention comprises: a support body; a lifting platform supported on the support body so as to be liftable; a conveyor belt stretched from the lifting platform for lifting and moving the lifting platform; a pulley around which the conveyor belt is wound; a shaft in which the pulley is embedded; a fixing member located on both sides of the pulley in the axial direction of the shaft; a pair of bearing units that rotatably hold the shaft on the fixing member; a cylindrical member that is respectively embedded in the shaft between each of the bearing units and the pulley; and an annular member having an open ring portion for being inserted and removed from the shaft, the annular member being respectively inserted into the shaft between each of the bearing units and the pulley, the conveying device adjustment method comprising: a removal step of removing a first annular member as the annular member from the shaft without removing the pulley and the cylindrical member from the shaft; and an insertion step of inserting a second annular member as the annular member having a thickness different from that of the first annular member instead of the first annular member. Effects of the Invention

[0008] According to one aspect of the present invention, it is possible to realize a conveyor device or the like that can shorten the work time for adjusting the position of a pulley. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a perspective view of a conveying device according to one embodiment of the present invention. Figure 2 It is a perspective view of a driving unit according to one embodiment of the present invention. Figure 3 This is a front view of a driving unit according to one embodiment of the present invention. Figure 4 It is a top view of the annular member which is one embodiment of the present invention. Figure 5 It is a perspective view of a driven pulley according to one embodiment of the present invention. Figure 6 This is a perspective view of a driving unit showing a method for adjusting a conveying device according to an embodiment of the present invention. Figure 7 This is a flowchart showing a method for adjusting a conveying device according to one embodiment of the present invention. DETAILED DESCRIPTION

[0010] Below, use Figure 1 to Figure 4 One embodiment of the present invention will be described in detail.

[0011] [Conveying device 1] Figure 1 1 is a perspective view showing the outline of the conveying device 1. Figure 1 The outline of the transport device 1 will be described.

[0012] The conveying device 1 is a device for conveying articles. In this specification, a stacking crane is exemplified as the conveying device 1. However, the conveying device of the present invention is not limited to a stacking crane, and may be, for example, a lifting platform for carrying articles, or an elevator fixed to the ground. In addition, the present invention can be applied to a conveying device having a lifting mechanism using a pulley and a conveyor belt, and can also be applied to a conveying vehicle (for example, an unmanned bridge-type conveying vehicle (OHT: Overhead Hoist Transport)), and an elevator that raises and lowers the conveying vehicle to tracks on different floors. The conveying device 1 includes a mast 10 (support body), a bracket 20 (lifting platform), a conveyor belt 30, a drive unit 40, and a driven pulley 50.

[0013] The mast 10 is a columnar member extending in the vertical direction. In the present embodiment, the masts 10 are two in a pair and are separated from each other. However, the number of masts 10 provided in the conveying device 1 is not limited to two in a pair. The mast 10 may include a lifting rail for guiding the bracket 20.

[0014] The bracket 20 is a member for placing articles conveyed by the conveyor device 1. The bracket 20 is provided between the pair of masts 10 and supported so as to be able to be raised and lowered relative to the masts 10. When the masts 10 have a lifting rail, the bracket 20 is raised and lowered along the lifting rail.

[0015] The conveyor belt 30 is a member for transmitting the power generated by the driving unit 40 to the bracket 20 so as to move the bracket 20 up and down. Two conveyor belts 30 are provided on each of the pair of masts 10. In each mast 10, one end of each of the two conveyor belts 30 may be fixed to the bracket 20. In addition, the other end of each of the two conveyor belts 30 may be connected to a counterweight (not shown) for balancing the weight with the bracket 20. Thus, in each mast 10, the bracket 20, the conveyor belt 30, the counterweight and the conveyor belt 30 may be connected in an annular manner.

[0016] The conveyor belt 30 is stretched without bending between a driven pulley 50 provided above each mast 10 and a driving unit 40 provided below each mast 10. The conveyor belt 30 may be, for example, a toothed belt or a belt of other shapes.

[0017] [Overview of the Driving Unit 40] Figure 2 40 is a perspective view of the driving unit 40. Figure 2 The drive unit 40 is described. The drive unit 40 moves the carriage 20 up and down via the conveyor belt 30. The drive unit 40 includes a pulley 41, a shaft 42, a flange 43 (fixing member), a bearing unit 44, a collar 45 (cylindrical member), a washer 46 (annular member), and a motor 47.

[0018] [Driver 40: Structure around the Pulley 41] The pulley 41 is a part around which the conveyor belt 30 is wound. Figure 2 In the embodiment, the pulley 41 has a shape corresponding to a flat belt. However, the shape of the pulley 41 can be arbitrarily selected according to the shape of the conveyor belt 30. For example, in the case where the conveyor belt 30 is a toothed conveyor belt, the pulley 41 can be a toothed pulley. In the present invention, the driving unit 40 has only one pulley 41. However, in order to appropriately apply tension to the conveyor belt 30, the driving unit 40 may also be provided with a secondary pulley.

[0019] The shaft 42 is a member for transmitting the rotation generated by the motor 47 to the pulley 41. The shaft 42 is fitted into the pulley 41 and rotates integrally with the pulley 41.

[0020] Figure 3 The driving unit 40 is viewed from a direction perpendicular to the shaft. The shaft 42 may include a large diameter portion 421 and a small diameter portion 422 with a smaller diameter than the large diameter portion 421. In this case, at least the small diameter portion 422 is located at a position including one end of the shaft 42. The small diameter portion 422 is embedded in the pulley 41.

[0021] The flange 43 is a fixing member for fixing the driving unit 40 to a surrounding structure (not shown). The flange 43 is located on both sides of the pulley 41 in the axial direction of the shaft 42. Figure 2 The example shown is an angle flange. However, the flange 43 is not limited to an angle flange, and any shape can be selected according to the connection with the conveying device 1.

[0022] The bearing unit 44 is a member that rotatably holds the shaft 42 on the flange 43. The bearing unit 44 has an outer wheel and an inner wheel located inside the outer wheel and rotatable relative to the outer wheel. The inner wheel is mounted on the shaft 42, and the outer wheel is mounted on the flange 43. The bearing unit 44 can be a well-known bearing unit, such as a ball bearing.

[0023] The driving part 40 has a pair of bearing units 44. The pair of bearing units 44 can be arranged in the small diameter part 422. Specifically, the pair of bearing units 44 can be arranged on both sides of the pulley 41. At this time, the bearing unit 44 located on the large diameter part 421 side relative to the pulley 41 is fixed in the axial position of the shaft 42 in a state of contact with the large diameter part 421. According to this structure, since the position of the pair of bearing units 44 and the pulley 41, the collar 45 and the gasket 46 located therebetween can be positioned on the small diameter part 422 between one end of the shaft 42 and the large diameter part 421, it is easy to fix the bearing unit 44 on the motor 47 side, and the positioning of the bearing unit 44, the pulley 41, the collar 45 and the gasket 46 can be performed quickly.

[0024] The collar 45 is a cylindrical member for positioning the pulley 41. The driving unit 40 has two collars 45. The collar 45 is embedded in the shaft 42 between each of the pair of bearing units 44 and the pulley 41. The collar 45 may not be fixed to the shaft 42.

[0025] [Driver 40: Regarding Gasket 46] Figure 4 Observed from the axial direction Figure 3 A top view of the gasket 46. The gasket 46 is used to position the pulley 41. The gasket 46 has an open loop portion 49, which is used to be able to be plugged in and out relative to the shaft 42. The gasket 46 has an arc portion 465 along the shape of the outer circumference of the shaft 42 and a pair of extension portions 464 extending from both ends of the arc portion 465 along the tangent direction of the two ends. The open loop portion 49 is formed between the pair of extension portions 464. The arc portion 465 can be an arc shape with a center angle of less than 180°. When the center angle of the arc portion 465 is 180°, the gasket 46 has a U-shaped shape. The width of the open loop portions 49 is separated from each other only in a manner that allows the shaft 42 to be embedded.

[0026] During the non-insertion operation, that is, during the insertion and installation period, the extension portion 464 does not contact the shaft 42. A through hole 463 for inserting a bolt is formed on the extension portion 464. A bolt hole (not shown) is formed on the pulley 41, and the bolt inserted through the through hole 463 is screwed into the bolt hole. The gasket 46 is fixed to the pulley 41 by screwing the bolt inserted through the through hole 463 into the bolt hole of the pulley 41. At this time, the through hole 463 is located on the outside starting from the outer edge of the collar 45, and is set at a position where the bolt and the collar 45 do not interfere. The collar 45 is arranged at a position substantially coaxial with the arc portion 465. The outer shape of the collar 45 can be smaller than the outer diameter of the arc portion 465, or it can be the same.

[0027] The driving unit 40 has a pair of washers 46. The washers 46 are inserted into the shaft 42 between the bearing units 44 and the pulleys 41, respectively. Figure 3 As shown, in this embodiment, a pair of washers 46 are respectively inserted between the pulley 41 and the collar 45. However, the pair of washers 46 may also be respectively inserted between the pair of bearing units 44 and the collar 45. In other words, the pair of washers 46 may be inserted on the pulley 41 side or the bearing unit 44 side relative to the collar 45.

[0028] In a state without the spacer 46, the sum of the lengths of the pulley 41 and the two collars 45 in the axial direction of the shaft 42 is shorter than the distance between the pair of bearing units 44. Therefore, in a state where the two collars 45 are in contact with the pair of bearing units 44, a gap is generated on one side or both sides of the pulley 41. By inserting the spacer 46 into the gap, the axial position of the pulley 41 can be fixed. The sum of the axial lengths of the pulley 41, the collar 45, and the spacer 46 is equal to the distance between the pair of bearing units 44. Thus, the position of the pulley 41 between the pair of bearing units 44 in the axial direction of the shaft 42 is determined by the collar 45 and the spacer 46.

[0029] By changing the thickness of the gasket 46 inserted on both sides of the pulley 41, the position of the pulley 41 in the axial direction of the shaft 42 can be changed. For example, when the pulley 41 is changed to the motor 47 side, the position of the pulley 41 can be changed to the motor 47 side by replacing the gasket 46 on the side opposite to the motor 47 with a thicker gasket and replacing the gasket 46 on the motor 47 side with a thinner gasket.

[0030] In the conventionally known conveying device, when changing the position of the pulley 41, it is necessary to pull out the shaft 42 from the pulley 41 and the collar 45 together with the motor 47 and replace it with a collar 45 of a different length. In contrast, in the conveying device 1 having the above-mentioned structure, the position of the pulley 41 is roughly determined by the collar 45, and the washer 46 of different thickness is replaced, so that the position of the pulley 41 can be adjusted without removing the shaft 42 from the pulley 41. Therefore, the operation time for adjusting the position of the pulley 41 can be shortened. Furthermore, by fixing the washer 46 to the pulley 41 with the bolt inserted into the through hole 463, the state in which the washer 46 is inserted into the shaft 42 can be maintained.

[0031] The thickness of the shim 46 in the axial direction of the shaft 42 may be smaller than the length of the collar 45 in the axial direction. In other words, the axial length of the collar 45 may be larger than the thickness of the shim 46. Thus, the shim 46 is used as a member for fine-tuning the positioning of the pulley 41. According to this structure, since the thickness of the shim 46 that is removed from the shaft 42 and replaced in order to adjust the position of the pulley 41 can be reduced, the ease of handling of the shim 46 can be improved. However, in the conveying device 1, the thickness of the shim 46 in the axial direction of the shaft 42 does not necessarily have to be smaller than the length of the collar 45 in the axial direction.

[0032] The spacer 46 can be fixed to the pulley 41. For example, Figure 2As shown, a part of the open ring portion 49 of the washer 46 may be fixed to the pulley 41 by bolts. In this case, the washer 46 rotates together with the pulley 41. By fixing the washer 46, the possibility of the washer 46 falling off due to the rotation of the shaft 42 etc. can be reduced. The washer 46 does not need to be fixed to the pulley 41, and may be fixed to the inner wheel of the bearing unit 44 or the collar 45, for example.

[0033] [Driver 40: Other Configurations] A fastener 48 may be mounted on the end of the small diameter portion 422 of the shaft 42. The fastener 48 fixes the pulley 41, the bearing unit 44, the collar 45, and the washer 46 to the shaft 42 so as not to fall off from one end of the shaft 42.

[0034] In addition, the pulley 41, the bearing unit 44, the collar 45 and the spacer 46 can be located on the small diameter portion 422. By clamping the components arranged on the small diameter portion 422 with the large diameter portion 421 and the fastener 48, the positions of these components can be determined, and in addition, these components can be fixed in a manner that does not fall off the shaft 42.

[0035] In addition, in the above-mentioned embodiment, the shaft 42 is a cylindrical shape having a large diameter portion 421 and a small diameter portion 422, that is, a cylindrical shape having different diameters. However, the shaft 42 may also be a cylindrical shape having the same diameter. In this case, a fastener (not shown) for fixing the bearing unit 44 on the motor 47 side may be mounted on the shaft 42. Thus, the pulley 41, the bearing unit 44, the collar 45, and the gasket 46 arranged between the bearing units 44 can be fixed at a predetermined position.

[0036] The motor 47 generates power to lift the bracket 20. The motor 47 can be electrically controlled by any control device (not shown), and commands such as rotation speed, torque, and drive ON / OFF can be provided by an external input device (not shown). The motor 47 is connected to the end of the large diameter portion 421 side of the shaft 42. Therefore, by the rotation of the motor 47, the shaft 42 and the pulley 41 rotate.

[0037] [Driven pulley 50] Figure 5 2 is a perspective view showing the structure of the driven pulley 50. Figure 5 The driven pulley 50 will be described. The driven pulley 50 rotates as the conveyor belt 30 moves. A shaft 51 is embedded in the driven pulley 50, and the driven pulley 50 rotates around the axis of the shaft 51. The shaft 51 is rotatably supported by a bearing unit 52 and a fixing member 53.

[0038] The fixing member 53 is fixed to the upper side of the mast 10 by bolts (not shown) or the like. Specifically, a through hole 54 through which the bolt can be inserted is provided in the fixing member 53. In addition, a threaded hole (not shown) through which the bolt is screwed is provided in the upper portion of the mast 10. The fixing member 53 can be fixed to the upper side of the mast 10 by screwing the bolt into the threaded hole while the bolt is inserted through the through hole 54.

[0039] With the above structure, the conveying device 1 can convey the articles placed on the bracket 20 by lifting or lowering them. Furthermore, the conveying device 1 can be provided with a traveling trolley 60, or can travel along a guide rail (not shown) disposed above or below the conveying device 1. In this case, the conveying device 1 can convey the articles along the area where the guide rail is provided.

[0040] [Adjustment method of conveying device 1: driving unit] Figure 6 It is a perspective view of the driving unit 40 for explaining a method of replacing the gasket 46 . Figure 7 This is a flowchart showing a method for adjusting the conveying device 1 at the installation site. Figure 6 and Figure 7 The assembling method and the adjustment method of the conveying device 1 will be described.

[0041] The first step (S1) is to assemble the conveyor 1. First, the mast 10 and the bracket 20 are placed on the traveling carriage 60. Next, the drive unit 40 is assembled and placed. The shaft 42 is embedded in a bearing unit 44 held on the flange 43. Next, the collar 45, the pulley 41, and the collar 45 are embedded in the shaft 42 in this order. At this time, a first gasket 461 (first annular member) as a gasket 46 is fixed on both sides of the pulley 41.

[0042] Furthermore, the shaft 42 is inserted into the bearing unit 44 held on the other flange 43, and in this state, the fastener 48 is installed at the end of the small diameter portion 422 side of the shaft 42. The pair of flanges 43 are fixed to the structural member of the traveling carriage 60 or the mast 10, and the motor 47 is installed at the end of the large diameter portion 421 side of the shaft.

[0043] The conveyor belt 30 is wound around the pulley 41 and the driven pulley 50 provided on the mast 10, and both ends of the conveyor belt 30 are connected to the bracket 20. At this time, the conveyor belt 30 is formed into an endless shape.

[0044] The second step (S2) is a step of driving the driving unit 40. During driving, tension is applied to the conveyor belt 30 and the conveyor belt 30 is driven.

[0045] The third step (S3) is a step of measuring the deviation between the conveyor belt 30 and the pulley 41. The measurement can be made by measuring the width center of the pulley 41 and the width center of the conveyor belt 30 with a ruler or the like, or by visual inspection by the operator.

[0046] The fourth step (S4) is a step of confirming whether there is a deviation between the conveyor belt 30 and the pulley 41. If there is a deviation between the conveyor belt 30 and the pulley 41 (Yes), the process proceeds to the fifth step. If there is no deviation (No), the adjustment method is terminated (End). The deviation can be determined by whether the center of the width of the pulley 41 is consistent with the center of the width of the conveyor belt 30 or whether they are consistent within a certain allowable range.

[0047] The fifth step (S5) is a step of removing the first gasket 461 (removal step). Figure 6 As shown, the first washer 461 is released from the shaft 42. At this time, an area corresponding to the length of the collar is ensured as a working space for removing the bolt, so the bolt can be removed. In this process, the pulley 41 and the collar 45 are not removed from the shaft 42. In addition, at this time, the tension applied to the conveyor belt 30 can also be removed to bend it.

[0048] The sixth step (S6) is a step (insertion step) of inserting the second gasket 462 (second annular member) as the gasket 46. The thickness of the first gasket 461 and the thickness of the second gasket 462 are different from each other. The second gasket 462 is selected so that the position of the pulley 41 in the axial direction of the shaft 42 is at an appropriate position with respect to the deviation of the conveyor belt 30 generated in the second step, and Figure 6 As shown, it is inserted in place of the first gasket 461.

[0049] For example, in the second step, when the first shim 461 with a thickness of 3 mm is used on both sides of the pulley 41, a deviation of 2 mm occurs on the motor 47 side in the position of the pulley 41 relative to the conveyor belt 30. In this case, in the fourth step, the second shim 462 with a thickness of 5 mm is inserted on the side of the pulley 41 opposite to the motor 47, and the second shim 462 with a thickness of 1 mm is inserted on the motor 47 side of the pulley 41. As a result, the pulley 41 can be moved 2 mm to the motor 47 side compared with the second step. In addition, when the tension applied to the conveyor belt 30 is removed in advance in the fifth step to bend it, no load is applied between the pulley 41 and the shaft 42, so the pulley 41 can be easily moved in the axial direction.

[0050] As described above, in the second to sixth steps, the shaft 42 is not pulled out from the pulley 41. Therefore, by removing the first washer 461 from the shaft 42 and inserting the second washer 462 into the shaft 42, the position of the pulley 41 in the conveyor 1 can be adjusted to coincide with the position of the conveyor belt 30 without pulling the shaft 42 out of the pulley 41.

[0051] The adjustment method of the present invention is not only beneficial for the assembly of the conveyor device 1, but also beneficial when replacing the conveyor belt 30. In this case, the conveyor belt 30 replacement and installation process is performed instead of process 1 (S1). In the conveyor belt 30 replacement and installation process, the tension of the conveyor belt 30 is released, and the connection between the conveyor belt 30 and the bracket 20 is released. The existing conveyor belt 30 is removed, and the new conveyor belt 30 is wound in a manner of hanging on the pulley 41 and the driven pulley 50 provided on the mast 10, and the two ends of the conveyor belt 30 are connected to the bracket 20. At this time, the conveyor belt 30 is formed into a ring shape. Then, tension is applied to the conveyor belt 30 while the shaft 42 is passed through the inner side of the conveyor belt 30.

[0052] [Adjustment method of conveyor device 1: driven pulley] In the conveying device 1, the driven pulley 50 can also adjust the axial position of the shaft 51. For example, the driven pulley 50 can also have a structure in which gaskets of the same shape as the gasket 46 are inserted on both sides of the axial direction of the shaft 51, similarly to the pulley 41 of the driving unit 40. In this case, the position of the driven pulley 50 can be adjusted by replacing the gasket.

[0053] However, since the driven pulley 50 has no motor connected to the rotating shaft, the position in the rotating shaft direction can be adjusted with a simple structure compared to the pulley 41 of the driving unit 40. Figure 5 As shown, the through hole 54 may be in the shape of an elongated hole with the longitudinal direction being the direction along the axial direction of the shaft 51. In this case, the position of the driven pulley 50 can be finely adjusted along the longitudinal direction of the through hole 54.

[0054] With this structure, the deviation of the conveyor belt 30 can be corrected more easily in the driven pulley 50 than in the pulley 41 .

[0055] [Summarize] The conveying device of the first embodiment of the present invention comprises: a supporting body; a lifting platform, which is supported on the supporting body in a liftable manner; a conveyor belt, which is tensioned from the lifting platform and is used to lift and move the lifting platform; a pulley, on which the conveyor belt is wound; a shaft, in which the pulley is embedded; a fixing member, which is located on both sides of the pulley in the axial direction of the shaft; a pair of bearing units, which rotatably hold the shaft on the fixing member; a cylindrical member, which is respectively embedded in the shaft between each of the bearing units and the pulley; and an annular member, which has an open ring portion for being able to be pulled out and inserted into the shaft, and the annular members are respectively inserted into the shaft between each of the bearing units and the pulley, and the position of the pulley between the pair of bearing units in the axial direction of the shaft is determined by the cylindrical member and the annular member.

[0056] In the conveying device according to the second aspect of the present invention, in the above-mentioned first aspect, the length of the cylindrical member in the axial direction of the shaft may be greater than the thickness of the annular member in the axial direction.

[0057] The conveying device according to the third aspect of the present invention is characterized in that, in the first or second aspect, the annular member may be fixed to the pulley.

[0058] In the conveying device of mode 4 of the present invention, in any one of the above modes 1 to 3, the shaft has a large diameter portion and a small diameter portion whose diameter is smaller than that of the large diameter portion, the small diameter portion includes one end of the shaft, and a pair of the bearing units, the pulley, the fixing member and the annular member are arranged in the small diameter portion.

[0059] The conveying device of the adjustment method of the conveying device of the fifth embodiment of the present invention comprises: a support body; a lifting platform supported on the support body in a liftable manner; a conveyor belt, which is stretched from the lifting platform and is used to lift and move the lifting platform; a pulley, on which the conveyor belt is wound; a shaft, in which the pulley is embedded; a fixing member, which is located on both sides of the pulley in the axial direction of the shaft; a pair of bearing units, which rotatably hold the shaft on the fixing member; a cylindrical member, which is respectively embedded in the shaft between each of the bearing units and the pulley; and an annular member, which has an open ring portion for being able to be pulled out and inserted into the shaft, and the annular member is respectively inserted into the shaft between each of the bearing units and the pulley, and the adjustment method of the conveying device includes: a removal step of removing a first annular member as the annular member from the shaft without removing the pulley and the cylindrical member from the shaft; and an insertion step of inserting a second annular member as the annular member having a thickness different from that of the first annular member instead of the first annular member.

[0060] The present invention is not limited to the above-mentioned embodiments, and various changes can be made within the scope of the claims. The embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. In addition, new technical features can be formed by combining the technical means disclosed in each embodiment. Explanation of symbols

[0061] 1: conveying device, 10: mast (support body), 20: bracket (lifting platform), 30: conveyor belt, 40: driving part, 41: pulley, 42: shaft, 43: flange (fixing member), 44: bearing unit, 45: collar (cylindrical member), 46: gasket (ring-shaped member), 47: motor, 48: fastener.

Claims

1. A conveying device, characterized in that: have: Support body; A lifting platform, which is supported on the supporting body in a liftable manner; A conveyor belt, which is tensioned from the lifting platform and is used to move the lifting platform up and down; a pulley around which the conveyor belt is wound; a shaft in which the pulley is embedded; A fixing member located on both sides of the pulley in the axial direction of the shaft; a pair of bearing units that rotatably hold the shaft on the fixed member; a cylindrical member respectively embedded in the shaft between each of the bearing units and the pulley; and an annular member having an open ring portion for being inserted and removed from the shaft, wherein the annular member is inserted onto the shaft between each of the bearing units and the pulley. The position of the pulley between the pair of the bearing units in the axial direction of the shaft is determined by the cylindrical member and the annular member.

2. The conveying device according to claim 1, characterized in that The length of the cylindrical member in the axial direction of the shaft is greater than the thickness of the annular member in the axial direction.

3. The conveying device according to claim 1, characterized in that: The annular member is fixed to the pulley.

4. The conveying device according to claim 1, characterized in that The shaft has a large diameter portion and a small diameter portion having a smaller diameter than the large diameter portion. The small diameter portion includes one end of the shaft, The pair of bearing units, the pulley, the fixing member, and the annular member are arranged in the small diameter portion.

5. A method for adjusting a conveying device, characterized in that: The conveying device comprises: Support body; A lifting platform, which is supported on the supporting body in a liftable manner; A conveyor belt, which is tensioned from the lifting platform and is used to move the lifting platform up and down; a pulley around which the conveyor belt is wound; a shaft in which the pulley is embedded; A fixing member located on both sides of the pulley in the axial direction of the shaft; a pair of bearing units that rotatably hold the shaft on the fixed member; a cylindrical member respectively embedded in the shaft between each of the bearing units and the pulley; and an annular member having an open ring portion for being inserted and removed from the shaft, wherein the annular member is inserted onto the shaft between each of the bearing units and the pulley. The adjustment method of the conveying device comprises: a step of removing a first annular member as the annular member from the shaft without removing the pulley and the cylindrical member from the shaft; as well as An inserting step of inserting a second annular member as the annular member having a thickness different from that of the first annular member in place of the first annular member.

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