Jig for assembling coupling, and extruder with jig

Abstract

To reduce burden of an assembling work of a coupling.SOLUTION: A jig for assembling 30 is used for an assembling work of a coupling 26 that connects a shaft of a screw shaft and an output shaft of a reducer to each other. The jig 30 comprises: a support base 31 on which rollers 31c for supporting the coupling 26 from below in a state in which the coupling can rotate about an axis parallel to an axis of the output shaft, are disposed; a height adjustment mechanism 32 for adjusting a height position of the support base 31; and a base 36 having a rail-like part 35 installed along an axis alignment direction being a horizontal direction and a direction perpendicular to an axial direction of the output shaft. The base 36 supports the support base 31 from below so that the support base 31 can move along the axis alignment direction on the rail-like part 35.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a coupling assembling jig and an extruder with the jig. [Background technology]

[0002] Conventionally, as disclosed in Patent Document 1 below, an extruder that continuously extrudes a material by driving a screw shaft with a motor has been known. Patent Document 1 below discloses an extruder shown in FIG. 8. This extruder includes a motor 82, a reducer 83, a barrel 84 housing a screw shaft, and a junction box 85 disposed between the reducer 83 and the barrel 84. A coupling 95 disposed within the junction box 85 connects a shaft 91 of the screw shaft to a shaft 92 of the reducer 83. The coupling 95 and the shaft 91 of the screw shaft are connected, for example, by a spline connection, and the coupling 95 and the shaft 92 of the reducer 83 are also connected, for example, by a spline connection. This allows the driving force of the shaft 92 of the reducer 83 to be transmitted to the shaft 91 of the screw shaft. A material inlet 94 is provided in the barrel 84 adjacent to the junction box 85, and the input material is fed axially through the barrel 84 by the screw shaft and extruded. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-179212 Summary of the Invention [Problem to be solved by the invention]

[0004] When connecting the shaft 92 of the reducer 83 and the shaft 91 of the screw shaft with the coupling 95, it is necessary to align the axial centers of the shafts 91, 92 with the central axis of the coupling 95, align the inner circumferential surface of the coupling 95 with the outer circumferential surface of the shafts 91, 92, and further align the phase of the splines of the coupling 95 with the phase of the splines of the shafts 91, 92. This requires work steps such as rotating the coupling 95 and moving the coupling 95 so that the shafts 91, 92 are inserted into the coupling 95. However, because the coupling 95 itself is large and heavy (approximately 100 kg), manual assembly by a worker is a laborious and difficult task.

[0005] The present invention has been made in view of the above-mentioned conventional technology, and its object is to provide a jig for assembling a coupling that can reduce the burden of assembling a coupling. [Means for solving the problem]

[0006] In order to achieve the above object, the coupling assembly jig of the present invention is a coupling assembly jig used in assembling a coupling that connects the rotation axis of a screw shaft and the output shaft of a reducer, and includes: a support base on which a plurality of rollers are arranged that supports the coupling from below in a state in which the coupling can rotate about an axis parallel to the axis of the output shaft, a height adjustment mechanism that adjusts the height position of the support base, and a base having rail-like portions that are installed horizontally and along an axis alignment direction that is perpendicular to the axial direction of the output shaft. The base supports the support base from below so that the support base can move on the rail-like portions along the axis alignment direction.

[0007] In the coupling assembly jig according to the present invention, the support base that supports the coupling can be moved along the rail-shaped portion in the axial alignment direction, and the height position of the support base can be adjusted by the height adjustment mechanism. Since the support base is supported from below by the base, the burden of adjusting the position of the support base that supports the coupling from below can be reduced. Furthermore, since the coupling can be rotated around its axis while supported from below by the support base, the workload of adjusting the rotational phase of the coupling can also be reduced.

[0008] The coupling assembly jig may further include a stopper that is provided on the support base at one axial end side of the coupling and that engages with the one axial end of the coupling when the coupling is supported.

[0009] In this aspect, when the coupling is moved in the axis alignment direction, for example, the coupling can be prevented from moving in the axial direction.

[0010] The stopper may be arranged so that its position can be adjusted between a stop position at one axial end of the coupling to lock the coupling, and a retracted position where the stopper is retracted from the stop position and allows axial movement of the coupling.

[0011] In this aspect, when it is undesirable for the coupling to move in the axial direction, the stopper can be positioned at the stop position, and when it is desired to move the coupling in the axial direction, the stopper can be positioned at the retracted position, thereby making it possible to appropriately restrict the axial movement of the coupling.

[0012] The stopper may be detachable from the support base. In this embodiment, the stopper can be removed from the support base when it is no longer needed.

[0013] The coupling assembly jig may further include a slide plate disposed on a supported surface supported by the rail-shaped portion. In this configuration, the slide plate slides relative to the rail-shaped portion when the support base is moved along the rail-shaped portion. Therefore, the support base can be moved smoothly.

[0014] The height adjustment mechanism may include a bolt attached to the lower end of the support base, the length of which is adjustable to project downward from the support base. In this embodiment, the length of the bolt projecting from the support base is changed by operating the bolt. This allows the height of the support base relative to the base to be adjusted.

[0015] The coupling assembling jig may further include a lower body located below the support base, supported by the rail-like portion of the base, and movable along the rail-like portion together with the support base. In this case, the height adjustment mechanism may be a jack device disposed between the support base and the lower body.

[0016] In this aspect, the height position of the support base relative to the lower body can be adjusted by the jack device. Also, because the lower body is movable along the rail-like portion, the height position of the support base relative to the lower body can also be adjusted while the lower body is being moved along the rail-like portion. Therefore, it is possible to adjust the height position of the support base while adjusting the position of the support base in the axis alignment direction.

[0017] The height adjustment mechanism may be disposed below the support platform and configured to be extendable and contractible in the height direction from a retracted state where it does not contact the support platform to a state where it supports the support platform from below and adjusts the height position of the support platform. In this case, the base may support the support platform from below so that the support platform can move on the rail-shaped portion in the axial alignment direction when the height adjustment mechanism is retracted to a state where it does not contact the support platform.

[0018] In this embodiment, the height adjustment mechanism is configured to be extendable in the height direction, so the height position of the support platform can be adjusted by extending or retracting the height adjustment mechanism. Moreover, the height adjustment mechanism can be retracted to a state where it does not contact the support platform, so in this state the support platform can be moved along the rail-like portion. In addition, since the support platform is supported from below by the base, the workload when moving the support platform can be reduced.

[0019] The rail-like portion may be formed to be longer than the length of the junction box in a direction perpendicular to the axial direction so that the coupling can be placed on the support base outside the junction box that houses the coupling.

[0020] In this aspect, the coupling can be placed on the support base outside the junction box, and the coupling can be moved into the junction box by moving the support base along the rail-like portion.

[0021] The extruder with jig of the present invention includes a reducer having an output shaft, a screw shaft, a barrel that stores the screw shaft, a coupling for connecting the output shaft of the reducer and the rotation shaft of the screw shaft to each other, and a junction box that stores the coupling and is arranged between the reducer and the barrel, and extrudes material by rotation of the screw shaft, and is also provided with the coupling assembly jig used in assembling the coupling, and a fastener for fixing the base of the coupling assembly jig to the junction box.

[0022] The jig-equipped extruder according to the present invention includes a coupling for connecting the output shaft of the reducer and the shaft of the screw shaft, a coupling assembly jig used in assembling the coupling, and a fastener for fixing the base of the coupling assembly jig to the junction box. Therefore, during the coupling assembly, the base of the coupling assembly jig is fixed to the junction box. This allows the support base that supports the coupling to be displaced relative to the junction box, thereby reducing the workload of, for example, adjusting the position of the coupling within the junction box. [Effects of the Invention]

[0023] As described above, according to the present invention, the burden of assembling a coupling can be reduced. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a view showing a coupling assembling jig according to a first embodiment as viewed in the axial direction. FIG. [Figure 2] 10 is a view showing the coupling assembling jig as seen in the axial alignment direction. FIG. [Figure 3] 1 is a diagram schematically illustrating an extruder for which a coupling assembling jig is used. [Figure 4] FIG. 2 is an enlarged view of a main part of FIG. 1. [Figure 5] FIG. 10 is a view showing a coupling assembling jig according to a second embodiment as viewed in the axial alignment direction. [Figure 6] FIG. 10 is a view showing a coupling assembling jig according to a third embodiment as viewed in the axial alignment direction. [Figure 7] 10A and 10B are diagrams schematically showing a support base provided on a coupling assembling jig according to another embodiment. [Figure 8] FIG. 1 is a schematic diagram of a conventional extruder. DETAILED DESCRIPTION OF THE INVENTION

[0025] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0026] (First embodiment) 1 and 2 show a coupling assembly jig (hereinafter referred to as the assembly jig) 30 according to this embodiment. The assembly jig 30 is a jig used in assembling a coupling 26 provided in an extruder 10 (see FIG. 3) for mixing and extruding materials such as plastic. The extruder 10 is configured to reduce the rotation speed of the drive motor 14 using a reducer 15 and rotate the screw shaft 13 at this reduced rotation speed. The extruder 10 is a twin-screw extruder having a pair of screw shafts 13.

[0027] The extruder 10 is provided with a coupling 26 that connects the output shaft 15a of the reducer 15 and the rotating shaft 13a of the screw shaft 13 to each other, and the assembly jig 30 is used in the work of assembling the coupling 26 to the output shaft 15a and the rotating shaft 13a.

[0028] Before describing the configuration of the assembly jig 30, the configuration of the extruder 10 will first be described. As shown in Fig. 3, the extruder 10 includes a screw shaft 13, a drive motor 14 that generates a driving force for driving the screw shaft 13, and a reducer 15 that reduces the rotation speed of the drive motor 14 and transmits the driving force of the drive motor 14 to the screw shaft 13. The drive motor 14 and the reducer 15 are installed on a base 16, and the reducer 15 is disposed to the side of the drive motor 14 (on the left side in Fig. 3).

[0029] A junction box 18 is adjacent to the reducer 15, and this junction box 18 connects the reducer 15 to a barrel 19. A space extending in the axial direction is formed inside the barrel 19, and the screw segments 13b of the screw shaft 13 are stored in this space. The barrel 19 is provided with a charging section 21 for charging material. When the screw shaft 13 rotates, the material charged through the charging section 21 is sent through the space inside the barrel 19 toward the tip side.

[0030] The barrel 19 is supported by the support base 23, but is also supported by the junction box 18. That is, the junction box 18 supports one end of the barrel 19 while being disposed between the barrel 19 and the reducer 15. For this reason, the junction box 18 is made of a sturdy housing.

[0031] The reducer 15 has a gear mechanism (not shown) that is driven by the drive motor 14 and reduces the input rotational speed, an output shaft 15a that is driven at the rotational speed reduced by the gear mechanism, and a housing 15b that accommodates the gear mechanism.

[0032] The output shaft 15a of the reducer 15 extends so as to protrude from the housing 15b. The output shaft 15a is connected to the rotating shaft 13a of the screw shaft 13 via a coupling 26 arranged in the junction box 18. That is, the output shaft 15a of the reducer 15 extends laterally (axially, to the left in FIG. 1) from the housing 15b and is inserted into the junction box 18. Meanwhile, the rotating shaft 13a of the screw shaft 13 extends laterally (axially, to the right in FIG. 1) from the screw segment 13b of the screw shaft 13 and is inserted into the junction box 18. Then, in the junction box 18, the coupling 26 couples the output shaft 15a of the reducer 15 to the rotating shaft 13a of the screw shaft 13.

[0033] The junction box 18 includes a reducer side wall 18a, a barrel side wall 18b, a ceiling wall 18c, and a bottom wall 18d, and is open in a horizontal direction perpendicular to the axial direction (a direction perpendicular to the plane of the paper in FIG. 3). The reducer side wall 18a is a side wall arranged along the housing 15b of the reducer 15. The barrel side wall 18b is a side wall arranged along the barrel 19. The ceiling wall 18c connects the upper parts of the reducer side wall 18a and the barrel side wall 18b. The bottom wall 18d connects the lower parts of the reducer side wall 18a and the barrel side wall 18b. The junction box 18 is provided with an opening 18f that opens in a horizontal direction perpendicular to the axial direction, allowing access to the inside of the junction box 18 from the side through this opening 18f.

[0034] The reducer side wall 18a is fastened to the housing 15b of the reducer 15 by unillustrated fasteners. Therefore, by removing the fasteners, the junction box 18 is released from the housing 15b. Furthermore, the barrel side wall 18b is connected to the barrel 19 by unillustrated fasteners. Therefore, by removing the fasteners, the junction box 18 is released from the barrel 19.

[0035] The coupling 26 is formed in a cylindrical shape, is disposed inside the junction box 18, and is fixed to the output shaft 15a and the rotating shaft 13a. That is, a female spline is formed on the inner peripheral surface of the coupling 26, and a male spline that meshes with the female spline is formed on the output shaft 15a and the rotating shaft 13a, respectively. By spline-connecting and fixing the coupling 26 to the output shaft 15a and the rotating shaft 13a, the driving force of the reducer 15 can be transmitted to the screw shaft 13.

[0036] By performing an operation to release the coupling 26, the coupling 26 becomes movable in the axial direction of the output shaft 15a and the rotating shaft 13a. In other words, the coupling 26 can be in a connected state in which it straddles the output shaft 15a and the rotating shaft 13a and connects the output shaft 15a and the rotating shaft 13a to each other, or a released state in which it moves axially from the connected state and releases the connection between the output shaft 15a and the rotating shaft 13a. In the released state, the coupling 26 can be moved to a position away from the rotating shaft 13a and the output shaft 15a. Furthermore, when the coupling 26 is assembled to the rotating shaft 13a and the output shaft 15a, the coupling 26 in the released state is assembled to the rotating shaft 13a and the output shaft 15a.

[0037] 1 and 2 is used when assembling the coupling 26 to the rotating shaft 13a of the screw shaft 13 and the output shaft 15a of the reducer 15. That is, the extruder 10 and the assembling jig 30 constitute an extruder with a jig.

[0038] The assembly jig 30 includes a support 33 for supporting the coupling 26, and also includes a base 36 having a rail-like portion 35. The support 33 has a support base 31 and a height adjustment mechanism 32, and is configured to allow the coupling 26 to move along the rail-like portion 35. By moving the support 33 relative to the base 36, the worker can move the coupling 26, and can also move the coupling 26 in the height direction.

[0039] The base 36 has a flat board portion 37, and the rail-shaped portion 35 is fixed to the board portion 37. The board portion 37 is configured to be placed on the bottom wall 18d of the junction box 18. That is, the board portion 37 has a rectangular shape that is long in one direction, and is used so that its longitudinal direction is aligned along a direction perpendicular to the axial direction (the left-right direction in FIG. 1, also referred to as the axial alignment direction). In this case, the width direction of the board portion 37 is aligned along the axial direction (the left-right direction in FIG. 2). The width direction length of the board portion 37 is shorter than the length of the bottom wall 18d (or the opening 18f) in the axial direction. Therefore, the board portion 37 can be inserted into the junction box 18 from the side. The length of the board portion 37 in the longitudinal direction may be shorter, longer, or the same as the length of the bottom wall 18d in the axial alignment direction.

[0040] The base plate portion 37 is provided with fasteners 38 for fixing the base 36 to the junction box 18 (bottom wall 18d). That is, the assembly jig 30 is detachable from the junction box 18. By fixing the base plate portion 37 to the bottom wall 18d, the position of the base 36 is fixed relative to the bottom wall 18d. In this state, the support base 31 that supports the coupling 26 can be moved relative to the bottom wall 18d.

[0041] The rail-shaped portion 35 has a shape that extends linearly along the longitudinal direction of the base portion 37. That is, when the base 36 is fixed to the junction box 18, the rail-shaped portion 35 extends in the axial alignment direction. At this time, the length of the rail-shaped portion 35 is longer than the length of the junction box 18 (or the bottom wall 18d) in the axial alignment direction. Therefore, when the base 36 is fixed to the junction box 18, the rail-shaped portion 35 protrudes laterally (in a direction perpendicular to the axial direction) from the junction box 18. Therefore, the support base 31, which is movable along the rail-shaped portion 35, can be moved from the outside to the inside of the junction box 18.

[0042] The rail-shaped portion 35 has a pair of rails arranged in parallel, but is not limited to this and may be configured, for example, by a single wide rail.

[0043] The support base 31 is configured to be movable along the rail-shaped portion 35. Specifically, the support base 31 includes a bottom plate 31a arranged horizontally above the rail-shaped portion 35, a support member 31b connected to the bottom plate 31a, and a plurality of rollers 31c supported by the support member 31b. The bottom plate 31a is formed in a rectangular shape extending in a direction perpendicular to the longitudinal direction of the rail-shaped portion 35. In other words, the bottom plate 31a has a shape that is long in a direction parallel to the axial direction of the coupling 26.

[0044] The support 33 (assembly jig 30) further includes a slide plate 31d that is placed on a supported surface that is supported by the rail-shaped portion 35. The supported surface is the lower surface of the bottom plate 31a of the support base 31 that faces the upper surface of the rail-shaped portion 35.

[0045] The slide plate 31d is an oil-impregnated plate, and the provision of the slide plate 31d reduces frictional resistance against the rail-shaped portion 35. This allows the support base 31, which supports the coupling 26 from below, to slide smoothly against the rail-shaped portion 35.

[0046] The support members 31b are provided at both ends of the bottom plate 31a in the longitudinal direction. Each support member 31b is joined to the bottom plate 31a at its lower end, and as shown in FIG. 4, a sleeve portion 31e into which the shaft portion of the roller 31c is inserted is provided at the upper end of the support member 31b. The roller 31c is inserted into the sleeve portion 31e of the support member 31b so as to provide a clearance fit. This allows the roller 31c to be rotatably supported.

[0047] Each roller 31c is formed in a cylindrical shape and is arranged so that its axis is aligned perpendicular to the direction in which the rail-shaped portion 35 extends. Each roller 31c rotatably supports the coupling 26 from below. That is, the rollers 31c are arranged at a predetermined interval so that their axes are parallel to one another. The cylindrical coupling 26 is placed on the rollers 31c arranged at this interval. At this time, the outer circumferential surface of the coupling 26 comes into contact with the outer circumferential surface of the roller 31c. When an operator applies a force to the coupling 26 to rotate the coupling 26, the rollers 31c rotate, thereby rotating the coupling 26. Note that although FIG. 1 shows an example in which two rollers 31c are provided, any number of rollers 31c may be used.

[0048] The support 33 (assembly jig 30) is provided on the support base 31 and further includes stoppers 39 for preventing the coupling 26 from moving in the axial direction. The stoppers 39 are provided at both ends of the bottom plate 31a in the longitudinal direction.

[0049] 4, each stopper 39 has an elongated hole 39a formed therein, and a bolt 40 is inserted through this elongated hole 39a and fastened to the bottom plate 31a, thereby allowing the stopper 39 to be fixed to the bottom plate 31a at different positions. Furthermore, the stopper 39 can be removed from the bottom plate 31a by removing the bolt 40. In other words, the stopper 39 is detachable from the support base 31. Note that the stopper 39 may not be detachable and may be attached to the support base 31.

[0050] Each stopper 39 is adjustable between a stop position where it locks one axial end of the coupling 26 and a retracted position where it is retracted from the stop position and allows axial movement of the coupling 26. Specifically, the stopper 39 is provided on the bottom plate 31a so as to be positioned below the coupling 26, and therefore, when in the stop position, the stopper 39 comes into contact with the lower end of the coupling 26 to lock the coupling 26. On the other hand, the retracted position is a position where the stopper 39 has moved downward from the stop position, and at this time, the stopper 39 does not come into contact with the lower end of the coupling 26.

[0051] Note that stopper 39 does not need to be formed to be movable up and down, and may be movable in a direction different from the above, as long as its position can be adjusted between the stop position and the retracted position. Also, stopper 39 does not need to be formed in a plate shape, and may be formed in a rod shape, for example, as long as it has a structure that can contact the end of coupling 26. Also, stopper 39 does not need to be provided on both sides in the axial direction, and may be provided on either side, or may be omitted.

[0052] 2, support 33 (assembly jig 30) further includes a pair of legs 31f extending downward from bottom plate 31a of support base 31. Legs 31f are provided at both longitudinal ends of bottom plate 31a of support base 31. Legs 31f integrally include a hanging portion extending downward from bottom plate 31a and a protruding portion protruding horizontally from the lower end of the hanging portion.

[0053] The overhanging portion is provided with a height adjustment mechanism 32 for adjusting the height position of the support base 31. The height adjustment mechanism 32 is attached to the leg portion 31f and has a bolt (jack bolt) 32a whose downward protrusion length from the overhanging portion of the leg portion 31f can be adjusted. The bolt 32a is provided so that its tip comes into contact with the upper surface of the bottom wall 18d of the junction box 18. By adjusting the protrusion length of the bolt 32a from the overhanging portion, the height position of the support base 31 from the bottom wall 18d can be adjusted. This makes it possible to adjust the height position of the coupling 26.

[0054] The height adjustment mechanism 32 may be configured with a leveling jack (not shown) instead of the bolt 32a. The leveling jack is provided on the bottom wall 18d so as to be positioned below the lower ends of the pair of legs 31f, and is configured to push up the pair of legs 31f when operated by an operator.

[0055] Here, a method for assembling the coupling 26 to the rotating shaft 13a of the screw shaft 13 and the output shaft 15a of the reducer 15 using the assembly jig 30 will be described. When assembling the coupling 26, for example, the rotating shaft 13a is moved so that it is retracted from inside the junction box 18 toward the barrel 19 so that the coupling 26 does not interfere with the rotating shaft 13a and the output shaft 15a.

[0056] In this state, the assembly jig 30 is inserted into the junction box 18 through the opening 18f of the junction box 18. At this time, the assembly jig 30 is inserted so that the rail-shaped portion 35 is aligned along a direction perpendicular to the axial direction (the depth direction in FIG. 3, the axial alignment direction).

[0057] Then, the base 36 of the assembly jig 30 is fixed to the bottom wall 18d of the junction box 18 by fasteners 38. At this time, the end of the rail-shaped portion 35 is located outside the junction box 18, and the support base 31 is disposed at one end of the rail-shaped portion 35 located on the outside. Therefore, the coupling 26 can be placed on the support base 31 outside the junction box 18. Note that because the base 36 is fixed to the bottom wall 18d, the rail-shaped portion 35 will not tilt even if the coupling 26 is placed on the support base 31 located at the end of the rail-shaped portion 35.

[0058] Once the coupling 26 is placed on the support base 31, the stopper 39 is attached so that it is in the stop position, thereby preventing the coupling 26 from moving in the axial direction.

[0059] Next, the support base 31 on which the coupling 26 is placed is slid along the rail-shaped portion 35, and when the axis of the coupling 26 is positioned directly below the axis of the rotary shaft 13a and the output shaft 15a, the movement of the support base 31 is stopped. In this state, the bolt 32a attached to the leg portion 31f is tightened. This causes the support base 31 to rise relative to the base 36, so that the axis of the coupling 26 can be aligned with the axis of the rotary shaft 13a and the output shaft 15a.

[0060] In this state, the coupling 26 is rotated about its axis to align the phase of the female splines of the coupling 26 with the phase of the male splines of the output shaft 15a. In this state, the stopper 39 is moved to the retracted position, making it possible to move the coupling 26 in the axial direction. Then, by moving the coupling 26 in the axial direction, the coupling 26 can be coupled to the output shaft 15a, and further, by moving the rotating shaft 13a in the axial direction, the male splines of the rotating shaft 13a can be coupled to the female splines of the coupling 26.

[0061] In this way, the coupling 26 can be assembled to the rotary shaft 13a and the output shaft 15a. Because the extruder 10 is a twin-screw extruder, the second coupling 26 is assembled in the same way, and then the fastener 38 of the base 36 is removed from the bottom wall 18d of the junction box 18, and the assembly jig 30 is removed from the junction box 18. This completes the assembly work of the coupling 26.

[0062] As described above, in the assembly jig 30 according to this embodiment, the support base 31 that supports the coupling 26 can be moved on the rail-shaped portion 35 in the axial alignment direction, and the height position of the support base 31 can be adjusted by the height adjustment mechanism 32. At this time, because the support base 31 is supported from below by the base 36, the burden of adjusting the position of the support base 31 that supports the coupling 26 from below can be reduced. Furthermore, because the coupling 26 can be rotated around the axis while being supported from below by the support base 31, the workload of adjusting the rotational phase of the coupling 26 can also be reduced.

[0063] Furthermore, in this embodiment, since the stopper 39 is provided on the support base 31, it is possible to prevent the coupling 26 from moving in the axial direction when the coupling 26 is moved, for example, in the axial alignment direction.

[0064] Moreover, because the stopper 39 is adjustable between the stop position and the retracted position, when it is undesirable for the coupling 26 to move in the axial direction, the stopper 39 can be positioned at the stop position, and when it is desired to move the coupling 26 in the axial direction, the stopper 39 can be positioned at the retracted position. This makes it possible to appropriately restrict the axial movement of the coupling 26.

[0065] Furthermore, since the stopper 39 is detachable from the support base 31, the stopper 39 can be removed from the support base 31 when it is no longer needed.

[0066] Furthermore, in this embodiment, since the support base 31 is provided with the slide plate 31d, when the support base 31 is moved along the rail-shaped portion 35, the slide plate 31d slides relative to the rail-shaped portion 35. Therefore, the support base 31 can be moved smoothly.

[0067] In this embodiment, the height adjustment mechanism 32 includes a bolt 32a whose downward protrusion length relative to the support base 31 can be adjusted, and therefore, by operating the bolt 32a, the protrusion length of the bolt 32a relative to the support base 31 can be changed. This makes it possible to adjust the height of the support base 31 relative to the base 36.

[0068] In this embodiment, the rail-shaped portion 35 is formed to be longer than the length of the junction box 18 in a direction perpendicular to the axial direction, so that the coupling 26 can be placed on the support base 31 outside the junction box 18. Furthermore, by moving the support base 31 along the rail-shaped portion 35, the coupling 26 can be moved into the junction box 18.

[0069] (Second embodiment) In the first embodiment, a bolt 32a serving as the height adjustment mechanism 32 is provided on a leg 31f extending from the support base 31. In contrast, in the second embodiment, as shown in Fig. 5, a support 33 (assembly jig 30) includes a lower body 42 configured separately from the support base 31, and the height adjustment mechanism 32 is configured by a jack device 32b disposed between the support base 31 and the lower body 42. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0070] The lower body 42 is a member located below the support base 31 and extending horizontally, and is located between the rail-shaped portion 35 and the bottom plate 31a of the support base 31. The slide plate 31d is not provided on the support base 31 but on the lower body 42. That is, the surface supported by the rail-shaped portion 35 is the lower surface of the lower body 42, that is, the lower surface of the lower body 42 that faces the upper surface of the rail-shaped portion 35. In this embodiment, the leg portion 31f extending downward from the support base 31 is omitted.

[0071] The jack device 32b is placed on the upper surface of the lower body 42, and in this state, the jack device 32b supports the support base 31 from below. Therefore, when the support base 31 is moved along the rail-shaped portion 35, the lower body 42, the jack device 32b, and the support base 31 move together along the rail-shaped portion 35. Furthermore, by operating the jack device 32b, the support base 31 moves up and down relative to the lower body 42. This makes it possible to adjust the height position of the support base 31 relative to the base 36, and therefore the height position of the coupling 26.

[0072] Therefore, in this embodiment, the jack device 32b can adjust the height position of the support base 31 relative to the lower body 42. Furthermore, because the lower body 42 is movable along the rail-shaped portion 35, the height position of the support base 31 relative to the lower body 42 can also be adjusted while the lower body 42 is being moved along the rail-shaped portion 35. Therefore, it is also possible to adjust the height position of the support base 31 while adjusting the position of the support base 31 in the axis alignment direction.

[0073] Although the description of other configurations, actions, and effects will be omitted, the description of the first embodiment can be applied to the second embodiment.

[0074] (Third embodiment) 6, in the third embodiment, a height adjustment mechanism 32 included in a support 33 is configured by an extendable device disposed below a support base 31. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0075] The height adjustment mechanism 32 is configured with a device such as a jack device 32c that can be extended and retracted in the vertical direction, and is disposed on a base plate portion 37 of the base 36. When the height adjustment mechanism 32 is in its most retracted state, it has a height that does not reach the underside of the support base 31, and is configured to push the support base 31 upward by extending upward from this state. When the support base 31 is pushed upward, the slide plate 31d of the support base 31 moves away from the upper surface of the rail-shaped portion 35. For this reason, in the third embodiment, the height adjustment mechanism 32 is used to adjust the height of the support base 31 after the position adjustment of the support base 31 in the axial alignment direction is completed. The jack device 32c may be configured with a jack such as a leveling jack.

[0076] Therefore, in this embodiment, the height adjustment mechanism 32 is configured to be extendable and retractable in the height direction, and the height position of the support base 31 can be adjusted by extending and retracting the height adjustment mechanism 32. Moreover, the height adjustment mechanism 32 can be retracted to such an extent that it does not come into contact with the support base 31, and in this state the support base 31 can be moved along the rail-shaped portion 35. In addition, at this time, the support base 31 is supported from below by the base 36, and therefore the workload when moving the support base 31 can be reduced.

[0077] Although the description of other configurations, actions, and effects will be omitted, the descriptions of the first and second embodiments can be applied to the third embodiment.

[0078] (Other embodiments) The disclosed embodiments are illustrative in all respects and should not be considered limiting. The present invention is not limited to the above-described embodiments, and various modifications and improvements are possible without departing from the spirit and scope of the present invention. For example, in the above-described embodiments, cylindrical rollers 31c are used in the assembly jig 30, but this is not limiting. For example, as shown in FIG. 7, rollers 31c made of ball rollers may be used. In this case, the support base 31 has a flat bottom plate 31a and left and right side portions 31g extending upward (or diagonally upward) from both ends of the bottom plate 31a, and rollers 31c made of ball rollers are attached to the bottom plate 31a and the left and right side portions 31g, respectively. This configuration reduces load not only when the coupling 26 is rotated but also when it is moved axially. [Explanation of symbols]

[0079] 10: Extruder 13: Screw shaft 13a: Rotation axis 14: Drive motor 15: Reducer 15a: Output shaft 18: Junction box 19: Barrel 26: Coupling 30: Assembly jig 31: Support stand 31c: Laura 31d: Slide plate 32: Height adjustment mechanism 32a: Bolt 32b: Jack device 32c: Jack device 33: Support 35: Rail-shaped part 36: Bass 38: Fasteners 39: Stopper 40: Bolt 42: Lower Body

Claims

1. A coupling assembling jig used in assembling a coupling that connects a rotation shaft of a screw shaft and an output shaft of a reducer, a support base on which a plurality of rollers are arranged to support the coupling from below in a state in which the coupling can rotate about an axis parallel to the axis of the output shaft; a height adjustment mechanism for adjusting the height position of the support base; a base having a rail-shaped portion that is installed horizontally and along an axis alignment direction that is a direction perpendicular to the axial direction of the output shaft, The base supports the support base from below so that the support base can move along the axial alignment direction on the rail-shaped portion.

2. 2. The coupling assembling jig according to claim 1, further comprising a stopper provided on the support base at one axial end side of the coupling, the stopper engaging with the one axial end of the coupling when the coupling is supported.

3. 3. The coupling assembling jig according to claim 2, wherein the stopper is arranged so as to be positionable between a stop position at the one axial end of the coupling where the stopper engages the coupling and a retracted position where the stopper is retracted from the stop position and where axial movement of the coupling is permitted.

4. 3. The coupling assembling jig according to claim 2, wherein the stopper is detachable from the support base.

5. 2. The coupling assembling jig according to claim 1, further comprising a slide plate disposed on a supported surface supported by said rail-shaped portion.

6. 2. The coupling assembling jig according to claim 1, wherein the height adjustment mechanism comprises a bolt attached to a lower end of the support base, the bolt being capable of adjusting the length of downward projection from the support base.

7. a lower body positioned below the support platform and supported by the rail-like portion of the base so as to be movable along the rail-like portion together with the support platform; 2. The coupling assembling jig according to claim 1, wherein the height adjustment mechanism is a jack device disposed between the support base and the lower body.

8. The height adjustment mechanism is disposed under the support base, and is configured to be extendable and contractible in a height direction from a contracted state where it does not contact the support base to a state where it supports the support base from below and adjusts the height position of the support base, 2. The coupling assembling jig according to claim 1, wherein the base supports the support base from below so that the support base can move on the rail-shaped portion along the axial alignment direction when the height adjustment mechanism is retracted to an extent that it does not come into contact with the support base.

9. 2. The coupling assembling jig according to claim 1, wherein the rail-shaped portion is formed to be longer than a length of the junction box in a direction perpendicular to an axial direction so that the coupling can be placed on the support base outside the junction box that houses the coupling.

10. a reducer having an output shaft; an extruder including a screw shaft, a barrel that houses the screw shaft, a coupling for connecting the output shaft of the reducer and a rotation shaft of the screw shaft to each other, and a junction box that houses the coupling and is disposed between the reducer and the barrel, and extrudes a material by rotation of the screw shaft; a coupling assembling jig according to any one of claims 1 to 8, which is used in assembling the coupling; and a fastener for fixing the base of the coupling assembly jig to the junction box.

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