Automatic assembling machine for inner single link of palm oil chain

Abstract

The utility model discloses an automatic assembly machine for a single link in a palm oil chain, which realizes automatic operation, improves the production efficiency of the chain, improves the product quality and brings economic benefits, and comprises an assembly line, a station is arranged on the assembly line, and a feeding mechanism, a transferring mechanism and a press fitting mechanism are arranged on the assembly line; the transfer mechanism comprises a first guide rail consistent with the transfer direction of the assembly line, at least one transfer plate arranged on a first sliding block of the first guide rail, and a second guide rail, the transfer plate is arranged on the second guide rail, at least one transfer groove is formed in the transfer plate, and the transfer plate is arranged in the transfer groove. The transfer groove is matched with a workpiece on the station, and the transfer plate performs two-dimensional movement in the directions of the first guide rail and the second guide rail, so that after the workpiece enters the transfer groove, the first sliding block moves to realize workpiece movement. The automatic assembling device is simple in structure, and a plurality of mechanisms are matched to realize automatic assembling.

Description

Technical Field

[0001] The utility model relates to a chain assembly structure, in particular to a single-section automatic assembly machine for a palm oil chain. Background Art

[0002] At present, in the production process of palm oil chain in China, the inner single section still relies on manual pressing, which may easily lead to undesirable conditions such as chain plate cutting and frame misalignment, resulting in a short chain life and failure to meet customer requirements. In addition, manual pressing is inefficient and dangerous. Therefore, it is very important to obtain an automatic assembly machine for the inner single section of palm oil chain that uses automated operations to replace manual operations. Utility Model Content

[0003] In order to solve the above-mentioned technical problems, the purpose of the utility model is to provide a single-section automatic assembly machine for palm oil chains that automates operations, improves chain production efficiency, improves product quality, and brings economic benefits, including an assembly line, at least one workstation is provided on the assembly line, and at least one loading mechanism corresponding to the workstation, a transfer mechanism for moving the workpiece on the workstation, and a press-fitting mechanism are provided on at least one side of the assembly line; the transfer mechanism includes a first guide rail consistent with the transfer direction of the assembly line, at least one transfer plate arranged on a first slider of the first guide rail, and also includes a second guide rail, the transfer plate is arranged on the second guide rail, and at least one transfer groove is provided on the transfer plate, the transfer groove cooperates with the workpiece on the workstation, and the transfer plate moves in two dimensions in the direction of the first guide rail and the second guide rail so that the workpiece enters the transfer groove and then the first slider moves to realize the movement of the workpiece.

[0004] The first driving device is fixedly connected to the transfer plate to control the transfer plate to move on the second guide rail.

[0005] The invention also includes a second driving device, which is fixedly connected to the first slider to control the sliding of the first slider. The invention also includes a damper arranged on both sides of the first slider, the ends of the damper cooperate with the side wall of the first slider, and the ends of the damper can be fixed with elastic material to play a role in buffering the sliding of the first slider.

[0006] The output component of the first driving cylinder is arranged perpendicularly to the assembly line, or arranged at an acute angle. The output end of the first driving cylinder is fixedly connected to the transfer plate, wherein the transfer groove includes a first groove, a second groove, a third groove and a fourth groove respectively matched with a plurality of workstations, and the transfer plate can be split, and the first groove, the second groove, the third groove and the fourth groove are provided on different transfer plates; or the transfer plate is integrally formed into a plate body.

[0007] Through the above technical solution, the above-set transfer groove cooperates with the work station. When the second driving cylinder moves, it drives the transfer plate to move, and transfers the last press-fitted workpiece to the next work station to continue the next press-fitting step.

[0008] The workstations include a lower chain plate loading station, a sleeve loading station, a roller loading station and a lower chain plate loading station which are arranged in sequence, and the loading mechanism includes:

[0009] The lower chain plate feeding mechanism includes a lower chain plate stacking plate placed on one side of the assembly line, a lower chain plate feeding plate that pushes the lower chain plate to the assembly line; and a lower chain plate cylinder, whose output shaft is fixedly connected to the lower chain plate feeding plate.

[0010] A sleeve feeding mechanism, including a sleeve stacking device placed on one side of the assembly line, and a sleeve feeding plate for pushing the sleeves to the assembly line;

[0011] A roller feeding mechanism, including a roller stack placed on one side of the assembly line, and a roller feeding plate that pushes the rollers to the assembly line;

[0012] The upper chain plate feeding mechanism comprises an upper chain plate stacking plate placed on one side of the assembly line and an upper chain plate feeding plate that pushes the upper chain plate to the assembly line.

[0013] It also includes a lower chain plate barrel with a built-in lower chain plate placement groove, in which the lower chain plates are stacked and placed, and the top of the lower chain plate placement groove is provided with a first inclined surface expanding outward and upward; it also includes a sleeve barrel with a built-in sleeve placement groove; it also includes a roller barrel with a built-in roller placement groove; it also includes an upper chain plate barrel with a built-in upper chain plate placement groove, in which the upper chain plates are stacked and placed, and the top of the upper chain plate placement groove is provided with a second inclined surface expanding outward and upward.

[0014] It also includes at least one third guide rail, a total push plate is fixed on the third slider of the third guide rail, a sleeve feed plate, a roller feed plate and an upper chain plate feed plate are formed on the total push plate, or are fixed on the total push plate, and also includes a feed cylinder, the output shaft of the feed cylinder is fixedly connected to the total push plate.

[0015] The sleeve feed plate is provided with two first slots, and the outer sides of the two first slots are respectively pivotally connected with first claws; the roller feed plate is provided with two second slots, and the outer sides of the two second slots are respectively pivotally connected with second claws. In the retracting step, the claws are opened and the parts fall into the material clamp; in the pushing step, the claws are clamped to feed the parts into the assembly line.

[0016] There are two corresponding chain plate positioning spring pins located on the assembly line and at the sleeve loading station and at the position where the lower chain plate cooperates to limit the lower chain plate. The chain plate positioning spring pin has an arc opening, and when the lower chain plate is pushed in, the chain plate positioning spring pin positions the lower chain plate.

[0017] The transfer plate includes a first feeding plate, a second feeding plate, and a third feeding plate corresponding to the sleeve loading station, the roller loading station, and the lower chain plate loading station, and the transfer plate also includes a fourth transfer plate.

[0018] The press-fitting mechanism includes a press-fitting bracket, on which a sleeve press-fitting oil cylinder, a roller press-fitting air cylinder, a pre-tightening press-fitting oil cylinder, and a chain plate press-fitting oil cylinder are respectively provided, which cooperate with the workstations. The output end of the sleeve press-fitting oil cylinder is fixed with a sleeve press pin, the output end of the roller press-fitting air cylinder is fixed with a roller press pin, the output end of the pre-tightening press-fitting oil cylinder is fixed with a pre-tightening press pin, and the output end of the chain plate press-fitting oil cylinder is fixed with a chain plate press pin. Fixed guide rails are respectively provided at the bottom of the bracket, and the fixing seat of the press pin that cooperates with the above-mentioned driving cylinder is arranged on the fixed guide rail to play a guiding role in the vertical direction. At least one of the sleeve press-fitting oil cylinder, the pre-tightening press-fitting oil cylinder, and the chain plate press-fitting oil cylinder is provided with a sensor. The sensor controls the stroke of the above-mentioned driving cylinder by identifying the downward movement of the fixing seat to ensure the qualification of the inner width of the inner section of the chain. The above-mentioned sensor is fixed on the sensor seat, and the sensor seat is fixed on the press-fitting bracket.

[0019] The assembly line includes an assembly bracket, on which a conveying groove is provided, and a bottom plate, on which the assembly line and the press-fit bracket are fixed, a frame is fixed under the bottom plate, and an adjustable base is fixed at the bottom of the frame, and the adjustable base can be a lifting and retracting rod to achieve height adjustment of the utility model.

[0020] Compared with the prior art, the utility model has the following benefits: the utility model has a simple structure, and multiple mechanisms cooperate with each other. The lower chain plate feeding plate of the lower chain plate loading station feeds the lower chain plate, which is pressed through the sleeve loading station, and then the transfer plate works synchronously to transfer it to the next station, that is, the workpiece of the sleeve loading station is transferred to the roller loading station, and the workpiece of the roller loading station is transferred to the lower chain plate loading station, and the pressing mechanism performs press-fitting. After the pressing is completed, the feeding mechanism retracts, the transfer mechanism moves, and then the positioning mechanism retracts, the transfer device retracts, and the above actions are repeated. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional diagram of the utility model;

[0022] Figure 2 The utility model is a three-dimensional feeding mechanism Figure 1 ;

[0023] Figure 3 The utility model is a three-dimensional feeding mechanism Figure 2 ;

[0024] Figure 4 The utility model is a three-dimensional feeding mechanism Figure 3 ;

[0025] Figure 5 The utility model transfer mechanism is three-dimensional Figure 1 ;

[0026] Figure 6 The utility model transfer mechanism is three-dimensional Figure 2 ;

[0027] Figure 7 This is a three-dimensional diagram of the press-fitting mechanism of the utility model;

[0028] 1Assembly line;

[0029] 101 assembly bracket; 102 conveying groove;

[0030] 201 lower chain plate loading station; 202 sleeve loading station; 203 roller loading station; 204 upper chain plate loading station;

[0031] 3. Feeding mechanism;

[0032] 301 lower chain plate cylinder; 302 lower chain plate feeding plate; 303 lower chain plate barrel; 304 first inclined surface; 305 sleeve barrel; 306 sleeve feeding plate; 307 roller barrel; 308 roller feeding plate; 309 upper chain plate barrel; 310 second inclined surface; 311 upper chain plate feeding plate; 312 third guide rail; 313 total push plate; 314 feeding cylinder; 315 first clamping claw; 316 second clamping claw; 317 chain plate positioning spring nail; 318 arc mouth; 319 feeding bracket; 320 material sensor;

[0033] 4. Transfer agency;

[0034] 401 first guide rail; 402 first slider; 403 transfer plate; 404 seat plate; 405 first driving device; 406 transfer groove; 407 first groove; 408 second groove; 409 third groove; 410 fourth groove; 411 slow mover; 412 second guide rail; 413 first feeding plate; 414 second feeding plate; 415 third feeding plate; 416 fourth transfer plate; 417 second driving device;

[0035] 5. Pressing mechanism;

[0036] 501 press-fit bracket; 502 sleeve press-fit cylinder; 503 roller press-fit cylinder; 504 pre-tightening press-fit cylinder; 505 chain plate press-fit cylinder; 506 sleeve press nail; 507 roller press nail; 508 pre-tightening press nail; 509 chain plate press nail; 510 fixed guide rail; 511 sensor;

[0037] 6 bottom plate; 7 frame; 8 adjustable base; 9 lower chain plate; 10 sleeve; 11 roller; 12 upper chain plate. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the present invention and to more clearly define the scope of protection claimed by the present invention, the present invention is described in detail below with respect to certain specific embodiments of the present invention. It should be noted that the following are only certain specific implementation methods of the present invention, which are only part of the embodiments of the present invention, and the specific and direct description of the relevant structures is only for the convenience of understanding the present invention, and the specific features do not naturally and directly limit the scope of implementation of the present invention.

[0039] Referring to the accompanying drawings, the utility model adopts the following technical scheme: an automated single-section automatic assembly machine for palm oil chains that automates operations, improves chain production efficiency, improves product quality, and brings economic benefits, including an assembly line 1, wherein the assembly line 1 is provided with at least one workstation, and at least one loading mechanism 3 corresponding to the workstation, a transfer mechanism 4 for moving the workpiece on the workstation, and a press-fitting mechanism 5 are provided on at least one side of the assembly line 1; the transfer mechanism 4 includes a first guide rail 401 consistent with the transfer direction of the assembly line 1, at least one transfer plate 403 arranged on a first slider 402 of the first guide rail 401, and also includes a second guide rail 412, the transfer plate 403 is arranged on the second guide rail 412, and at least one transfer groove 406 is provided on the transfer plate 403, the transfer groove 406 cooperates with the workpiece on the workstation, and the transfer plate 403 moves in two dimensions in the directions of the first guide rail 401 and the second guide rail 412 so that the first slider 402 moves after the workpiece enters the transfer groove 406 to realize the movement of the workpiece.

[0040] The first driving device 405 is fixedly connected to the transfer plate 403 to control the transfer plate 403 to move on the second guide rail 412.

[0041] The second driving device 417 is also included, and the second driving device 417 is fixedly connected to the first slider 402 to control the sliding of the first slider 402. The first slider 402 is also provided with a damper 411 on both sides thereof, and the ends of the damper 411 are matched with the side wall of the first slider 402. The ends of the damper 411 can be fixed with elastic material, which can play a role in buffering the sliding of the first slider 402.

[0042] The output component of the first driving cylinder is arranged perpendicularly to the assembly line 1, or arranged at an acute angle. The output end of the first driving cylinder is fixedly connected to the transfer plate 403, wherein the transfer groove 406 includes a first groove 407, a second groove 408, a third groove 409 and a fourth groove 410 respectively matched with a plurality of workstations, and the transfer plate 403 can be a split type, and the first groove 407, the second groove 408, the third groove 409 and the fourth groove 410 are provided on different transfer plates 403; or the transfer plate 403 is integrally formed into a plate body.

[0043] Through the above technical solution, the above-set transfer groove 406 cooperates with the work station. When the second driving cylinder moves, it drives the transfer plate 403 to move, and transfers the last press-assembled workpiece to the next work station to continue the next press-assembly.

[0044] The device further includes a seat plate 404 , which is fixed on the first slider 402 . The transfer plate 403 is movably disposed on the seat plate 404 . The damper 411 contacts two sides of the seat plate 404 .

[0045] It also includes a loading bracket 319, and the loading barrel is fixedly mounted on the loading bracket 319, and the loading bracket 319 is fixed on the bottom plate 6. A material sensor 320 can be installed on the loading barrel to detect loading or no material and prompt to add material.

[0046] The workstations include a lower chain plate loading station 201, a sleeve loading station 202, a roller loading station 203 and an upper chain plate loading station 204 which are arranged in sequence. The loading mechanism 3 includes:

[0047] The lower chain plate 9 loading mechanism 3 includes a lower chain plate 9 stacking placed on one side of the assembly line 1 and a lower chain plate feeding plate 302 for pushing the lower chain plate 9 to the assembly line 1; and also includes a lower chain plate cylinder 301, whose output shaft is fixedly connected to the lower chain plate feeding plate 302.

[0048] The sleeve 10 feeding mechanism 3 includes a sleeve 10 stacking device placed on one side of the assembly line 1 and a sleeve feeding plate 306 for pushing the sleeve 10 to the assembly line 1;

[0049] The roller 11 feeding mechanism 3 includes a roller 11 stacking device placed on one side of the assembly line 1 and a roller feeding plate 308 for pushing the roller 11 to the assembly line 1;

[0050] The upper chain plate 12 loading mechanism 3 includes an upper chain plate 12 stacking device placed on one side of the assembly line 1 and an upper chain plate feeding plate 311 for pushing the upper chain plate 12 to the assembly line 1 .

[0051] It also includes a lower chain plate barrel 303 with a built-in lower chain plate 9 placement groove, in which the lower chain plates 9 are stacked and placed, and the top of the lower chain plate 9 placement groove is provided with a first inclined surface 304 that expands outward and upward; it also includes a sleeve barrel 305 with a built-in sleeve 10 placement groove; it also includes a roller barrel 307 with a built-in roller 11 placement groove; it also includes an upper chain plate barrel 309 with a built-in upper chain plate 12 placement groove, in which the upper chain plates 12 are stacked and placed, and the top of the upper chain plate 12 placement groove is provided with a second inclined surface 310 that expands outward and upward.

[0052] It also includes at least one third guide rail 312, on which a total push plate 313 is fixed to the third slider of the third guide rail 312, and a sleeve feed plate 306, a roller feed plate 308 and an upper chain plate feed plate 311 are formed on the total push plate 313, or are fixed on the total push plate 313, and also includes a feed cylinder 314, whose output shaft is fixedly connected to the total push plate 313.

[0053] The sleeve feed plate 306 is provided with two first slots, and the outer sides of the two first slots are respectively pivotally connected with first claws 315; the roller feed plate 308 is provided with two second slots, and the outer sides of the two second slots are respectively pivotally connected with second claws 316. In the retracting step, the claws are opened and the parts fall into the material clamp. In the pushing step, the claws are clamped to feed the parts into the assembly line 1.

[0054] A torsion spring may be provided at the pivot connection to facilitate resetting of the claw.

[0055] Two corresponding chain plate positioning spring pins 317 are provided on the assembly line 1 and at the sleeve loading station 202, and at the position cooperating with the lower chain plate 9 to limit the lower chain plate 9. For example, a spring sheet is fixed on the assembly line, and the spring sheet contacts the chain plate positioning spring pin 317 to realize the movement of the chain plate positioning spring pin, that is, when the lower chain plate moves to the station, the spring sheet is squeezed to make the chain plate positioning spring pin move outward, and then it is subjected to the elasticity of the spring sheet to contact the surface of the lower chain plate. The chain plate positioning spring pin 317 has an arc opening 318, and when the lower chain plate 9 is pushed in, the chain plate positioning spring pin 317 positions the lower chain plate 9.

[0056] The transfer plate 403 includes a first feeding plate 413 , a second feeding plate 414 , and a third feeding plate 415 corresponding to the sleeve loading station 202 , the roller loading station 203 , and the upper chain plate loading station 204 , and the transfer plate 403 also includes a fourth transfer plate 416 .

[0057] The press-fitting mechanism 5 comprises a press-fitting bracket 501, on which a sleeve press-fitting oil cylinder 502, a roller press-fitting air cylinder 503, a pre-tightening press-fitting oil cylinder 504, and a chain plate press-fitting oil cylinder 505 are respectively provided, which are matched with the workstations. A sleeve press pin 506 is fixed at the output end of the sleeve press-fitting oil cylinder 502, a roller press pin 507 is fixed at the output end of the roller press-fitting air cylinder 503, a pre-tightening press pin 508 is fixed at the output end of the pre-tightening press-fitting oil cylinder 504, and a chain plate press pin 509 is fixed at the output end of the chain plate press-fitting oil cylinder 505. Fixed guide rails 510 are respectively provided at the bottom of the bracket, and the fixing seat of the press pin matched with the above-mentioned driving cylinder is arranged on the fixed guide rails 510, which plays a guiding role in the vertical direction. A sensor 511 is provided on at least one of the sleeve press-fitting oil cylinder 502, the pre-tightening press-fitting oil cylinder 504, and the chain plate press-fitting oil cylinder 505. The sensor 511 controls the stroke of the driving cylinder by identifying the downward movement of the fixed seat to ensure the qualification of the inner width of the inner section of the chain. The sensor 511 is fixed on the sensor 511 seat, and the sensor 511 seat is fixed on the press-fit bracket 501.

[0058] The assembly line 1 includes an assembly bracket 101, on which a conveying groove 102 is provided. The assembly line 1 also includes a bottom plate 6, on which the assembly line 1 and the press-fit bracket 501 are fixed, under which a frame 7 is fixed, and at the bottom of which an adjustable base 8 is fixed, which can be a telescopic rod to achieve height adjustment of the utility model.

[0059] Compared with the prior art, the utility model has the following benefits: the utility model has a simple structure, and multiple mechanisms cooperate with each other. The lower chain plate feeding plate 302 of the lower chain plate loading station 201 feeds the lower chain plate 9, which is pressed through the sleeve loading station 202, and then the transfer plate 403 works synchronously and transfers it to the next station, that is, the workpiece of the sleeve loading station 202 is transferred to the roller loading station 203, and the workpiece of the roller loading station 203 is transferred to the upper chain plate loading station 204, and the pressing mechanism 5 performs press-fitting. After the pressing is completed, the loading mechanism 3 retreats, the transfer mechanism 4 moves, and then the positioning mechanism retreats, the transfer device retreats, and the above actions are repeated.

[0060] That is, first load the material, then press it, then return to the press, then return to the loading station, and then move to the next station.

[0061] The above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A single-section automatic assembly machine for palm oil chains, characterized by: The invention comprises an assembly line (1), wherein at least one workstation is provided on the assembly line (1), at least one loading mechanism (3) corresponding to the workstation is provided on at least one side of the assembly line (1), a transfer mechanism (4) for moving a workpiece on the workstation, and a pressing mechanism (5); The transfer mechanism (4) comprises a first guide rail (401) which is consistent with the transfer direction of the assembly line (1), at least one transfer plate (403) arranged on a first slider (402) of the first guide rail (401), and also comprises a second guide rail (412), wherein the transfer plate (403) is arranged on the second guide rail (412), and at least one transfer groove (406) is provided on the transfer plate (403), wherein the transfer groove (406) cooperates with the workpiece on the workstation, and the transfer plate (403) moves two-dimensionally in the direction of the first guide rail (401) and the second guide rail (412) so that the workpiece enters the transfer groove (406), and then the first slider (402) moves to realize the movement of the workpiece.

2. The single-section automatic assembly machine for palm oil chains according to claim 1, characterized in that: It also includes a first driving device (405), wherein the first driving device (405) is fixedly connected to the transfer plate (403) to control the transfer plate (403) to move on the second guide rail (412).

3. The single-section automatic assembly machine for palm oil chains according to claim 2, characterized in that: It also includes a second driving device (417), wherein the second driving device (417) is fixedly connected to the first sliding block (402) to control the sliding of the first sliding block (402).

4. The single-section automatic assembly machine for palm oil chains according to claim 1, characterized in that: The workstations include a lower chain plate loading station (201), a sleeve loading station (202), a roller loading station (203) and a lower chain plate loading station (201) which are arranged in sequence, and the loading mechanism (3) includes: A lower chain plate (9) feeding mechanism (3), comprising a stack of lower chain plates (9) placed on one side of the assembly line (1), and a lower chain plate feeding plate (302) for pushing the lower chain plates (9) to the assembly line (1); A sleeve (10) feeding mechanism (3), comprising a sleeve (10) stacking device placed on one side of the assembly line (1) and a sleeve feeding plate (306) for pushing the sleeve (10) to the assembly line (1); A roller (11) feeding mechanism (3), comprising a roller (11) stack placed on one side of the assembly line (1), and a roller feeding plate (308) for pushing the roller (11) to the assembly line (1); An upper chain plate (12) feeding mechanism (3) comprises an upper chain plate (12) stacking device placed on one side of the assembly line (1) and an upper chain plate feeding plate (311) for pushing the upper chain plate (12) to the assembly line (1).

5. The single-section automatic assembly machine for palm oil chains according to claim 4 is characterized in that: It also includes at least one third guide rail (312), a total push plate (313) is fixed on the third slider of the third guide rail (312), a sleeve feed plate (306), a roller feed plate (308) and an upper chain plate feed plate (311) are formed on the total push plate (313), or are fixed on the total push plate (313), and also includes a feed cylinder (314), the output shaft of the feed cylinder (314) is fixedly connected to the total push plate (313).

6. The single-section automatic assembly machine for palm oil chains according to claim 4 or 5, characterized in that: The sleeve feeding plate (306) is provided with two first clamping grooves, and the outer sides of the two first clamping grooves are respectively pivotally connected with first clamping claws (315); And / or, the roller feeding plate (308) is provided with two second clamping grooves, and the outer sides of the two second clamping grooves are respectively pivotally connected with second clamping claws (316).

7. The single-section automatic assembly machine for palm oil chains according to claim 4, characterized in that: Two corresponding chain plate positioning spring pins (317) are provided on the assembly line (1) and at the sleeve loading station (202), where they cooperate with the lower chain plate (9), so as to limit the position of the lower chain plate (9).

8. The single-section automatic assembly machine for palm oil chains according to claim 4, characterized in that: The transfer plate (403) includes a first feeding plate (413), a second feeding plate (414), and a third feeding plate (415) corresponding to the sleeve loading station (202), the roller loading station (203), and the upper chain plate loading station (204), and the transfer plate (403) also includes a fourth transfer plate (416).

9. The single-section automatic assembly machine for palm oil chains according to claim 1, characterized in that: The press-fitting mechanism (5) comprises a press-fitting bracket (501), on which a sleeve press-fitting cylinder (502), a roller press-fitting cylinder (503), a pre-tightening press-fitting cylinder (504), and a chain plate press-fitting cylinder (505) are provided respectively cooperating with the workstations.

10. The single-section automatic assembly machine for palm oil chains according to claim 9, characterized in that: At least one of the sleeve press-fitting cylinder (502), the pre-tightening press-fitting cylinder (504), and the chain plate press-fitting cylinder (505) is provided with a sensor (511).

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