A toughness detection device for cable production

Abstract

The utility model relates to cable detection technical field, concretely is a kind of tenacity detection device for cable production, including detection table, the opening is set in the middle of detection table top, opening middle bottom is set with mounting groove, lifting assembly is equipped in mounting groove middle, lifting assembly includes the pressure sensor that the telescopic arm top of electric push rod and electric push rod are connected, the opening top of detection table is equipped with protection assembly, movable clamping assembly includes two movable clamping plates and the rotatable threaded rod between two movable clamping plates, and the lower part of slot is equipped with backing plate;The tenacity detection device for cable production, by setting the detection table with display screen, the pressure value of pressure sensor detection exerted on lifting assembly is displayed in real time, under the cooperation of locating cap and flap, the opening inside protection of detection table is carried out simultaneously, while cable tenacity detection, flap closure reduces cable breakage to the injury influence of user, two groups of movable clamping assembly are fixed in the cooperation with second rubber pad, and double-layer clamping is carried out to the both ends of cable.

Description

Technical Field

[0001] This utility model relates to the field of cable testing technology, specifically a toughness testing device for cable production. Background Technology

[0002] Cables are used to transmit electricity, data and signals, as well as to connect various devices and systems. Cable manufacturing toughness testing devices are equipment used to test the toughness and durability of cables under stress.

[0003] The announcement number CN221445704U describes a cable toughness testing device, which includes a workbench, two support plates symmetrically arranged on the top surface of the workbench, a lifting device arranged between the two support plates, two fixing parts arranged on opposite sides of the lifting device for fixing the two ends of the cable, a transparent enclosure arranged on the top surface of the workbench and located outside the support plates, and a driving device for driving the transparent enclosure to extend and retract in the vertical direction.

[0004] The above technical solution, by setting up a transparent enclosure, can block broken wire ends during cable toughness testing, preventing injury to workers; by limiting the material of the transparent enclosure to transparent, it facilitates workers' observation of the cable testing process; by setting up a driving device, the transparent enclosure can be shortened when not in use, without obstructing cable operations during initial cable fixing and final cable disassembly; however, when the cable is not being tested, it cannot prevent the influence of the external environment on the internal structure, cannot provide comprehensive protection during cable toughness testing to reduce the impact of cable breakage on the surrounding environment, and cannot perform multi-layered position fixing at both ends of the cable during toughness testing, thus not increasing the stability of the end installation. Utility Model Content

[0005] The purpose of this invention is to provide a toughness testing device for cable production, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A cable toughness testing device includes a testing platform with an opening in the middle of the top and a mounting groove at the bottom of the opening. A lifting assembly is located in the middle of the mounting groove. The lifting assembly includes an electric push rod and a pressure sensor connected to the top of the telescopic arm of the electric push rod. A support platform is located above the pressure sensor. A protective assembly is located at the top of the opening of the testing platform. Through slots are located near the bottom on both side walls of the testing platform. A sliding groove is located at the top of each through slot. A movable clamping assembly is located above the through slots. The movable clamping assembly includes two movable clamping plates and a rotatable threaded rod installed between the two movable clamping plates. A longitudinal threaded hole corresponding to the threaded rod is located on the top plate of the side wall of the testing platform. A support plate is located below the through slots.

[0008] The protective assembly includes a positioning cover and a flip cover that are rotatably connected to the positioning cover, and the flip cover is symmetrically provided with observation windows.

[0009] Furthermore, a display screen is provided on the front end of the testing platform near the left end, and the rear end of the display screen is fixedly connected to the testing platform by screws.

[0010] In this invention, the display screen helps to display the values ​​detected by the pressure sensor in real time, enabling a direct understanding of the force applied to the cable's toughness.

[0011] Specifically, the positioning cover is T-shaped, and the rear end of the upper surface of the positioning cover is fixedly connected to the testing platform by screws. The front end of the positioning cover is rotatably connected to the rear end of the flip cover by a hinge. The flip cover is L-shaped, and the bottom of the front end of the flip cover is tightly fitted to the bottom of the front side of the opening of the testing platform.

[0012] In this utility model, the positioning cover is easy to install and the flip cover is fixed. Both the flip cover and the positioning cover correspond to the opening on the top of the testing platform, which can seal the opening and reduce the entry of dust or water droplets from the external environment into the interior, thus preventing internal damage when not in use. At the same time, the combined action of the positioning cover and the flip cover can reduce the risk of cable breakage during internal cable toughness testing, thus achieving a protective function.

[0013] Secondly, the observation window is glued and fixed to the flip cover around its perimeter, and a handle is provided on the outer wall of the flip cover near the bottom.

[0014] In this invention, the observation window is made of tempered glass, which helps outsiders to observe the internal cable toughness test status through the observation window. The handle is welded and fixed to the flip cover, and the handle provides a point of force to facilitate the operation of opening the flip cover.

[0015] It should be noted that the bottom of the electric push rod is fixedly connected to the bottom of the mounting groove by screws, the bottom of the pressure sensor is bonded and fixed to the top of the telescopic arm of the electric push rod, the top of the pressure sensor is bonded and fixed to the bottom of the support platform, the support platform is U-shaped, and a rotatable pulley is provided in the middle of the support platform.

[0016] In this invention, the electric push rod is electrically connected to an external control switch via a wire, and the control switch is electrically connected to an external power source via a wire. The pressure sensor is electrically connected to the processor inside the display screen via a wire, transmitting the pressure value detected by the pressure sensor to the display screen in real time. When the control switch is turned on, the telescopic arm of the electric push rod is extended to support the cable above the pulley and perform cable tensile toughness testing. When the telescopic arm is shortened, the pulley is moved down to reduce the impact of cable slack on disassembly.

[0017] Furthermore, the pallets are symmetrically distributed on both sides below the through groove and are welded and fixed to the testing table. Each pallet is provided with a first rubber pad on its upper surface. The length of the first rubber pad is adapted to the length of the pallet, and the bottom of the first rubber pad is bonded and fixed to the top of the pallet.

[0018] In this invention, the first rubber pad increases the friction with the cable below, and an arc-shaped groove corresponding to the through groove is opened at the center of the upper surface of the first rubber pad. The upper surface of the first rubber pad is provided with several protrusions to increase the friction with the cable.

[0019] It is worth noting that the width of the outer wall of the two movable clamping plates is adapted to the width of the outer wall of the pallet. A connecting block is provided between the two movable clamping plates, and the two ends of the connecting block are welded and fixed to the corresponding movable clamping plates. Trapezoidal blocks are symmetrically provided on the opposite sides of the movable clamping plates. Trapezoidal grooves are opened on the side wall of the testing table at the locations corresponding to the trapezoidal blocks. The width of the inner wall of the trapezoidal groove is adapted to the width of the outer wall of the trapezoidal block.

[0020] In this invention, the trapezoidal block and the trapezoidal groove are slidably inserted to achieve stable sliding engagement of the two moving clamping plates in the vertical direction. The connecting block and the sliding groove are slidably engaged, and the threaded rod is threadedly connected to the longitudinal threaded hole. A rotating column is provided at the bottom of the threaded rod, and a rotating groove is provided on the connecting block at the corresponding position of the rotating column. The rotating column and the rotating groove are rotatably engaged. A crank is provided at the top of the threaded rod, and the bottom of the crank is fixedly connected to the top of the threaded rod by a screw. The bottom of each moving clamping plate is provided with a second rubber pad. The lower surface of the second rubber pad is provided with an arc-shaped groove at the corresponding position of the through groove, and several protrusions are provided on the lower surface of the second rubber pad, which are staggered with the protrusions on the upper surface of the first rubber pad. This helps to clamp the cable between the second rubber pad and the first rubber pad and increases the frictional resistance.

[0021] Furthermore, each of the outer walls of the testing platform is provided with a transverse threaded hole that communicates with the interior of the corresponding longitudinal threaded hole, and each transverse threaded hole is provided with a positioning bolt.

[0022] In this invention, the positioning bolt is threadedly connected to the transverse threaded hole, and a handle is provided at the outer end of the positioning bolt. The outer diameter of the handle is larger than that of the transverse threaded hole. The inner end of the positioning bolt is in close contact with the threaded rod, and the position of the threaded rod is fixed under the cooperation of frictional resistance.

[0023] In addition, guide components are provided on the outer wall of the testing platform at positions corresponding to the support plate. The guide components are symmetrically provided with boss plates, and guide rollers are provided between the boss plates. The guide rollers are rotatably connected to the boss plates.

[0024] In this invention, the boss plate is L-shaped and is welded and fixed to the testing table, which increases the stability of the installation. The top of the guide roller is flush with the top of the support plate. With the cooperation of the guide roller, it helps to guide the cable whose toughness needs to be tested to pass through the testing table.

[0025] Compared with the prior art, the beneficial effects of this utility model are:

[0026] 1. This utility model features a testing platform with a display screen that displays the pressure value applied by the pressure sensor on the lifting assembly in real time. With the cooperation of the positioning cover and the flip cover, the inside of the testing platform opening is protected. At the same time, during cable toughness testing, the flip cover closing reduces the impact of cable breakage on the user. The test platform has a support plate with a first rubber pad below the perforation. With the cooperation of the two sets of moving clamping components with a second rubber pad, the two ends of the cable are clamped and fixed in a double layer, increasing the clamping stability.

[0027] 2. This utility model features a threaded rod with a crank handle, which is rotatably connected to a connecting block in cooperation with a rotating column. The movable clamping plate is engaged with the trapezoidal block and the trapezoidal groove. Rotating the crank handle allows for adjustment of the movable clamping plate's position. The second rubber pad has a raised surface on its lower surface, which is staggered with the raised surface of the first rubber pad, which helps to increase the frictional resistance of the cable clamping. With the cooperation of the boss plate with guide rollers, it is convenient for the detection cable to extend into the detection table. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0029] Figure 2 This is a schematic diagram of the cable toughness testing structure of this utility model;

[0030] Figure 3 This is a schematic diagram of the combined structure of the testing platform and protective components of this utility model;

[0031] Figure 4 This is a schematic diagram of the combination of the testing platform and the lifting assembly of this utility model;

[0032] Figure 5This is a schematic diagram of the frame structure of the testing platform of this utility model;

[0033] Figure 6 This is a schematic diagram of the dynamic clamping component of this utility model;

[0034] Figure 7 This is a schematic diagram of the combined structure of the moving clamping component and the tray of this utility model.

[0035] The meanings of the labels in the diagram are as follows:

[0036] 1. Testing table; 10. Mounting slot; 11. Display screen; 12. Through slot; 120. Slide groove; 13. Longitudinal threaded hole; 130. Horizontal threaded hole; 131. Trapezoidal groove; 132. Positioning bolt;

[0037] 2. Protective components; 20. Positioning cover; 21. Flip cover; 210. Observation window; 211. Pull handle;

[0038] 3. Lifting assembly; 30. Electric push rod; 300. Pressure sensor; 31. Support platform; 310. Pulley;

[0039] 4. Pallet; 40. First rubber pad;

[0040] 5. Movable clamping assembly; 50. Movable clamping plate; 500. Connecting block; 501. Trapezoidal block; 502. Rotary groove; 51. Threaded rod; 510. Rotating column; 511. Handle; 52. Second rubber pad;

[0041] 6. Guide assembly; 60. Boss plate; 61. Guide roller. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] Please see Figures 1-7 This embodiment provides a technical solution:

[0044] A cable toughness testing device includes a testing platform 1. A display screen 11 is provided on the front end face of the testing platform 1 near the left end. The rear end face of the display screen 11 is fixedly connected to the testing platform 1 by screws.

[0045] In this invention, the display screen 11 helps to display the values ​​detected by the pressure sensor 300 in real time, enabling a direct understanding of the force applied to the cable's toughness.

[0046] Furthermore, an opening is made in the middle of the top of the testing table 1, and a mounting groove 10 is made at the bottom of the middle of the opening. A lifting assembly 3 is provided in the middle of the mounting groove 10. The lifting assembly 3 includes an electric push rod 30 and a pressure sensor 300 connected to the top of the telescopic arm of the electric push rod 30. A support platform 31 is provided above the pressure sensor 300. The bottom of the electric push rod 30 is fixedly connected to the bottom of the mounting groove 10 by screws. The bottom of the pressure sensor 300 is bonded and fixed to the top of the telescopic arm of the electric push rod 30. The top of the pressure sensor 300 is bonded and fixed to the bottom of the support platform 31. The support platform 31 is U-shaped and has a rotatable pulley 310 in the middle.

[0047] In this invention, the electric push rod 30 is electrically connected to an external control switch via a wire, and the control switch is electrically connected to an external power source via a wire. The pressure sensor 300 is electrically connected to the internal processor of the display screen 11 via a wire, and the pressure value detected by the pressure sensor 300 is transmitted to the display screen 11 for display in real time. When the control switch is turned on, the telescopic arm of the electric push rod 30 is extended to support the cable above the pulley 310 and to perform cable tensile toughness testing. When the telescopic arm is shortened, the pulley 310 is moved downward to reduce the impact of cable slack on disassembly.

[0048] Specifically, a protective component 2 is provided at the top of the opening of the testing table 1. Through slots 12 are provided on both sides of the testing table 1 near the bottom. A sliding groove 120 is provided at the top of each through slot 12. A movable clamping component 5 is provided above the through slots 12. The movable clamping component 5 includes two movable clamping plates 50 and a rotatable threaded rod 51 installed between the two movable clamping plates 50. The width of the outer wall of the two movable clamping plates 50 is adapted to the width of the outer wall of the support plate 4. A connecting block 500 is provided between the two movable clamping plates 50. The two ends of the connecting block 500 are welded and fixed to the corresponding movable clamping plates 50. Trapezoidal blocks 501 are symmetrically provided on the opposite side of each movable clamping plate 50. A trapezoidal groove 131 is provided on the side wall of the testing table 1 corresponding to the trapezoidal block 501. The width of the inner wall of the trapezoidal groove 131 is adapted to the width of the outer wall of the trapezoidal block 501.

[0049] In this invention, the trapezoidal block 501 and the trapezoidal groove 131 are slidably inserted to achieve a stable sliding engagement of the two moving clamping plates 50 in the vertical direction. The connecting block 500 is slidably engaged with the sliding groove 120, and the threaded rod 51 is threadedly connected to the longitudinal threaded hole 13. The bottom of the threaded rod 51 is provided with a rotating column 510, and the connecting block 500 is provided with a rotating groove 502 corresponding to the rotating column 510. The rotating column 510 and the rotating groove 502 are rotatably engaged. The top of the threaded rod 51 is provided with a crank handle 511, and the bottom of the crank handle 511 is fixedly connected to the top of the threaded rod 51 by screws. The bottom of each moving clamping plate 50 is provided with a second rubber pad 52. The lower surface of the second rubber pad 52 is provided with an arc-shaped groove corresponding to the through groove 12, and the lower surface of the second rubber pad 52 is provided with several protrusions, which are staggered with the protrusions on the upper surface of the first rubber pad 40. This helps to clamp the cable between the second rubber pad 52 and the first rubber pad 40 and increases the frictional resistance.

[0050] It should be noted that the top plate of the side wall of the testing table 1 is provided with a longitudinal threaded hole 13 corresponding to the threaded rod 51, and a support plate 4 is provided below the through groove 12; the support plates 4 are symmetrically distributed on both sides below the through groove 12 and are welded and fixed to the testing table 1. The upper surface of the support plate 4 is provided with a first rubber pad 40, the length of the first rubber pad 40 is adapted to the length of the support plate 4, and the bottom of the first rubber pad 40 is bonded and fixed to the top of the support plate 4.

[0051] In this invention, the first rubber pad 40 increases the friction with the cable below, and an arc-shaped groove corresponding to the through groove 12 is provided at the center of the upper surface of the first rubber pad 40. The upper surface of the first rubber pad 40 is provided with several protrusions to increase the friction with the cable.

[0052] Furthermore, each of the outer walls of the testing platform 1 is provided with a transverse threaded hole 130 that communicates with the interior of the corresponding longitudinal threaded hole 13, and each transverse threaded hole 130 is provided with a positioning bolt 132.

[0053] In this utility model, the positioning bolt 132 is threadedly connected to the transverse threaded hole 130, and the outer end of the positioning bolt 132 is provided with a handle. The outer diameter of the handle is larger than that of the transverse threaded hole 130. The inner end of the positioning bolt 132 is close to the threaded rod 51, and the position of the threaded rod 51 is fixed under the cooperation of frictional resistance.

[0054] It is worth adding that the protective component 2 includes a positioning cover 20 and a flip cover 21 rotatably connected to the positioning cover 20, and the flip cover 21 is symmetrically provided with observation windows 210.

[0055] Furthermore, the positioning cover 20 is T-shaped, and the rear end of the upper surface of the positioning cover 20 is fixedly connected to the detection table 1 by screws. The front end of the positioning cover 20 is rotatably connected to the rear end of the flip cover 21 by a hinge. The flip cover 21 is L-shaped, and the bottom of the front end of the flip cover 21 is tightly fitted to the bottom of the front side of the opening of the detection table 1.

[0056] In this utility model, the positioning cover 20 is easy to install and the flip cover 21 is fixed. Both the flip cover 21 and the positioning cover 20 correspond to the opening at the top of the test platform 1, so as to seal the opening and reduce the entry of dust or water droplets from the external environment into the interior, which may cause internal damage when not in use. At the same time, with the joint cooperation of the positioning cover 20 and the flip cover 21, the damage to the user caused by the cable breaking during the internal cable toughness test is reduced, thus achieving a protective function.

[0057] Secondly, the observation window 210 is glued and fixed to the flip cover 21 around its perimeter, and a handle 211 is provided on the outer wall of the flip cover 21 near the bottom.

[0058] In this utility model, the observation window 210 is made of tempered glass, which helps outsiders to observe the internal cable toughness test status through the observation window 210. The handle 211 is welded and fixed to the flip cover 21, and the handle 211 provides a force point to facilitate the opening operation of the flip cover 21.

[0059] Furthermore, guide components 6 are provided on the outer wall of the testing table 1 at the corresponding positions of the support plate 4. The guide components 6 are symmetrically provided with boss plates 60, and guide rollers 61 are provided between the boss plates 60. The guide rollers 61 are rotatably connected to the boss plates 60.

[0060] In this invention, the boss plate 60 is L-shaped and is welded and fixed to the testing table 1 to increase the stability of the installation. The top of the guide roller 61 is flush with the top of the support plate 4. With the cooperation of the guide roller 61, it helps to guide the cable whose toughness needs to be tested to pass through the testing table 1.

[0061] When using the cable production toughness testing device of the embodiment, firstly, the positioning cover 20 with the flip cover 21 is combined and fixed with the testing table 1 with the display screen 11. Then, the electric push rod 30 with the pressure sensor 300 is fixed in the mounting groove 10, and the support table 31 with the pulley 310 is fixed on the top of the pressure sensor 300. The support plate 4 with the first rubber pad 40 is manually fixed below the through groove 12. Then, the movable clamp 50 connected by the connecting block 500 is inserted and engaged with the trapezoidal block 501 and the trapezoidal groove 131 to realize the up and down movement on the side wall of the testing table 1. The threaded rod 51 is threadedly connected to the longitudinal threaded hole 13.

[0062] When cable toughness testing is required, first, move the movable clamp 50 upward by rotating the crank handle 511 in the forward direction. The threaded rod 51 moves the movable clamp 50 to the top of the slide groove 120. Then, one end of the cable to be tested passes from the left guide roller 61, through the left support plate 4, into the left through groove 12, and extends into the right through groove 12, passing over the right support plate 4. Then, rotate the crank handle 511 in the reverse direction to adjust the movable clamp 50 downward. The first rubber pad 40 with protrusions and the second rubber pad 52 with protrusions come into close contact, and the protrusions on the upper surfaces of the second rubber pad 52 and the first rubber pad 40 are arranged alternately, which helps to clamp the cable. The frictional resistance is increased, and the threaded rod 51 descends to a position where it cannot descend further, tightly clamping both ends of the cable. It is then threadedly connected to the transverse threaded hole 130 through the positioning bolt 132. The end of the positioning bolt 132 is tightly fitted to the threaded rod 51, fixing the position of the threaded rod 51 under the action of friction, preventing the two structures clamping the cable from loosening. The flip cover 21 closes to protect the internal parts and prevent the cable from breaking and causing injury to the user. Finally, the electric push rod 30 is activated, the telescopic arm extends, and the pulley 310 moves upward, pushing the cable to stretch. The value detected by the pressure sensor 300 is displayed on the display screen 11, allowing external personnel to monitor it in real time.

Claims

1. A cable toughness testing device, comprising a testing table (1), characterized in that: The testing platform (1) has an opening in the middle of the top, and an installation groove (10) is provided at the bottom of the opening. A lifting assembly (3) is provided in the middle of the installation groove (10). The lifting assembly (3) includes an electric push rod (30) and a pressure sensor (300) connected to the top of the telescopic arm of the electric push rod (30). A support platform (31) is provided above the pressure sensor (300). A protective assembly (2) is provided at the top of the opening of the testing platform (1). Through grooves (12) are provided on both sides of the testing platform (1) near the bottom. A sliding groove (120) is provided at the top of each through groove (12). A movable clamping assembly (5) is provided above the through groove (12). The movable clamping assembly (5) includes two movable clamping plates (50) and a rotatable threaded rod (51) installed between the two movable clamping plates (50). A longitudinal threaded hole (13) corresponding to the threaded rod (51) is provided on the top plate of the side wall of the testing platform (1). A support plate (4) is provided below the through groove (12). The protective component (2) includes a positioning cover (20) and a flip cover (21) rotatably connected to the positioning cover (20), and observation windows (210) are symmetrically provided on the flip cover (21).

2. The cable toughness testing device according to claim 1, characterized in that: The front end of the testing station (1) is provided with a display screen (11) near the left end, and the rear end of the display screen (11) is fixedly connected to the testing station (1) by screws.

3. The cable toughness testing device according to claim 1, characterized in that: The positioning cover (20) is T-shaped. The rear end of the upper surface of the positioning cover (20) is fixedly connected to the detection table (1) by screws. The front end of the positioning cover (20) is rotatably connected to the rear end of the flip cover (21) by hinges. The flip cover (21) is L-shaped. The bottom of the front end of the flip cover (21) is tightly fitted to the bottom of the front opening of the detection table (1).

4. The cable toughness testing device according to claim 3, characterized in that: The observation window (210) is glued and fixed to the flip cover (21) at the four edges, and a handle (211) is provided on the outer wall of the flip cover (21) near the bottom.

5. The cable toughness testing device according to claim 1, characterized in that: The bottom of the electric push rod (30) is fixedly connected to the bottom of the mounting groove (10) by screws. The bottom of the pressure sensor (300) is bonded and fixed to the top of the telescopic arm of the electric push rod (30). The top of the pressure sensor (300) is bonded and fixed to the bottom of the support platform (31). The support platform (31) is U-shaped and has a rotatable pulley (310) in the middle.

6. The cable toughness testing device according to claim 1, characterized in that: The tray (4) is symmetrically distributed on both sides below the groove (12) and welded to the testing table (1). The upper surface of the tray (4) is provided with a first rubber pad (40). The length of the first rubber pad (40) is adapted to the length of the tray (4). The bottom of the first rubber pad (40) is bonded to the top of the tray (4).

7. The cable toughness testing device according to claim 1, characterized in that: The width of the outer wall of the two movable clamps (50) is adapted to the width of the outer wall of the support plate (4). A connecting block (500) is provided between the two movable clamps (50). The two ends of the connecting block (500) are welded and fixed to the corresponding movable clamps (50). Trapezoidal blocks (501) are symmetrically provided on the opposite side of each movable clamp (50). A trapezoidal groove (131) is opened on the side wall of the detection table (1) at the position corresponding to the trapezoidal block (501). The width of the inner wall of the trapezoidal groove (131) is adapted to the width of the outer wall of the trapezoidal block (501).

8. The cable toughness testing device according to claim 1, characterized in that: The outer wall of the testing platform (1) is provided with a transverse threaded hole (130) that communicates with the interior of the corresponding longitudinal threaded hole (13), and a positioning bolt (132) is provided in each transverse threaded hole (130).

9. The cable toughness testing device according to claim 1, characterized in that: The outer wall of the testing table (1) is provided with guide components (6) corresponding to the tray (4). The guide components (6) are symmetrically provided with boss plates (60). Guide rollers (61) are provided between the boss plates (60). The guide rollers (61) are rotatably connected to the boss plates (60).

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