A press-fitting device for assembling multi-size chain links

Abstract

The application relates to a press-fitting equipment for assembling multiple sizes of chain links and belongs to the field of automatic press-fitting technology. The equipment comprises a rack, a press-fitting execution mechanism, a workpiece positioning mechanism and a linkage selection mechanism. The linkage selection mechanism comprises a fixed base plate, a rotary disc, a driving lever and a linkage push rod. The rotary disc is provided with multiple selection stations with different sizes and different support surface heights in the circumferential direction, which correspond to chain link pin shafts with different diameters. When the press-fitting execution mechanism is pressed downward, the press-fitting stroke end pushes the linkage push rod downward, the linkage push rod drives the driving lever to swing, the yoke drives the rotary disc to rotate, and the selection station corresponding to the current chain link pin shaft diameter is automatically turned to a position opposite to the press-fitting execution mechanism. The application synchronizes the press-fitting action and the selection action through pure mechanical linkage, does not need external power and an electric control system, simplifies the operation, and significantly improves the efficiency and positioning precision of multiple varieties of chain link assembly.

Description

Technical Field

[0001] This application relates to the field of automated press-fitting technology, and in particular to a press-fitting device for assembling multi-size chain links. Background Technology

[0002] Chain links are the basic units that make up a chain, and their assembly process typically requires precisely pressing pins into the pin holes of the outer chain plates. Press-fitting equipment is the core equipment for this process, and its performance directly affects the quality and production efficiency of the chain products.

[0003] In the chain manufacturing industry, to meet the needs of different working conditions, there are numerous specifications and models of chains, and the pin diameters used for chain links of different specifications also vary. Currently, traditional pressing equipment generally uses dedicated positioning fixtures (e.g., molds with positioning grooves of specific diameters) to process chain links of a single size. When it is necessary to switch to producing chains of different specifications, the operator must stop the equipment and then manually disassemble and replace the entire rotary table or positioning mold to match the new pin diameter. In addition, the position and stroke of the pressing mechanism must be readjusted. The entire changeover process is time-consuming and relies on the operator's experience to ensure positioning accuracy.

[0004] This reliance on manual tooling changes and adjustments not only severely impacts the overall production line's cycle time and efficiency, increasing labor intensity, but also makes frequent disassembly and manual calibration prone to introducing positioning deviations. This results in poor coaxiality between the pin and the chain plate hole during pressing, leading to pressing damage or poor assembly, ultimately affecting the quality and lifespan of the final chain product. Therefore, there is an urgent need for a pressing device capable of automatically, quickly, and accurately switching to suitable tooling based on changes in chain link specifications to overcome the numerous shortcomings of the existing technology. Summary of the Invention

[0005] The purpose of this application is to overcome the above-mentioned technical problems and provide a press-fitting device for assembling multi-size chain links.

[0006] This application provides a press-fitting device for assembling multi-size chain links, including a frame, a press-fitting actuator, and a workpiece positioning mechanism. The press-fitting actuator is mounted on the upper part of the frame. It also includes a linkage selection mechanism, which is located on the frame and below the press-fitting actuator. The linkage selection mechanism includes: a fixed base, fixedly mounted on the frame; a rotary table, rotatably mounted on the fixed base, rotatable about a vertical axis, with multiple selection stations of different sizes distributed circumferentially on the rotary table. Each selection station has a different support surface height and corresponds to chain link pins of different diameters; and a drive lever. The drive lever is hinged to a fixed chassis. One end of the drive lever is equipped with a fork, which engages with a groove on the outer circumferential wall of the rotary table to rotate the rotary table and switch the selection position. The linkage push rod is vertically slidably mounted on the frame. The upper end of the linkage push rod abuts against the pressing stroke end of the pressing actuator, and the lower end of the linkage push rod is hinged to the other end of the drive lever. When the pressing actuator presses down, the pressing stroke end pushes the linkage push rod downward, which drives the drive lever to swing. The fork rotates the rotary table, causing the selection position corresponding to the current chain link pin diameter to be rotated to the position directly opposite the pressing actuator.

[0007] Preferably, the linkage selection mechanism further includes a ratchet assembly, which comprises: a ratchet, fixedly mounted on the bottom of the rotary table, the number of teeth of the ratchet being the same as and corresponding one-to-one with the number of selection stations; a pawl, hinged to the fixed chassis, the pawl engaging with the tooth groove of the ratchet; and a return torsion spring, sleeved on the hinge shaft of the pawl, used to provide elastic force to the pawl pressing against the ratchet; each time the pressing actuator completes a pressing and returns to its original position, the linkage push rod moves upward accordingly, driving the lever to swing in the opposite direction, and the lever fork drives the rotary table to rotate to the next selection station facing the pressing actuator, whereby the pawl engages in the corresponding tooth groove to lock the rotary table. By adopting the above technical solution, the ratchet assembly ensures that the step angle of each rotation of the rotary table is precisely consistent and corresponds one-to-one with the selection station, while also having a locking function to prevent accidental rotation of the rotary table during pressing, thus ensuring the accuracy of selection and the stability of the pressing process.

[0008] Preferably, each selection station includes a V-shaped support surface formed by radial inward concavity and an elastic support member disposed at the bottom of the V-shaped support surface. The elastic support member includes: a support block, slidably disposed in the bottom groove of the selection station; and a support spring, disposed in the bottom groove, one end of the support spring abutting against the bottom of the bottom groove and the other end abutting against the support block, used to lift the support block upward; the upper end surface of the support block is an arc surface adapted to the outer wall of the pin. By adopting the above technical solution, the V-shaped support surface can perform preliminary centering and radial positioning of pins of different diameters, while the elastic support member can provide stable support force and buffer the impact force of pressing, preventing the pin from shifting or being damaged during the pressing process.

[0009] Preferably, the workpiece positioning mechanism includes: a first clamping arm, fixedly mounted on the frame and located on one side of the linkage selection mechanism along the radial direction, with a first positioning fork at the end of the first clamping arm; a second clamping arm, slidably mounted on the frame and located on the other side of the linkage selection mechanism along the radial direction, with a second positioning fork at the end of the second clamping arm opposite to the first positioning fork; a linkage clamping rod, one end of which is hinged to the second clamping arm; a swing transmission arm, hinged in the middle to the frame, one end of which is hinged to the other end of the linkage clamping rod, with a waist-shaped sliding hole at the other end of the swing transmission arm; and a drive pin, fixedly mounted on the linkage push rod, which passes through the waist-shaped sliding hole. When the linkage push rod moves downward, the drive pin slides in the waist-shaped sliding hole and pushes the swing transmission arm to swing. The swing transmission arm pulls the second clamping arm toward the direction of the first clamping arm through the linkage clamping rod, so that the first positioning fork and the second positioning fork clamp the outer chain plate of the chain link from both sides. By adopting the above technical solution, the downward power of the same linkage push rod is used to synchronously drive the clamping arm through the linkage mechanism to clamp the outer chain plate of the chain link, realizing the linkage between selection and clamping action. No additional clamping power source is required, and the workpiece is reliably fixed before pressing.

[0010] Preferably, the assembly also includes a self-locking component, comprising: a locking rack, vertically fixed to the side of the linkage push rod, with the teeth of the locking rack inclined upwards; a locking pawl, hinged to the frame, with locking teeth at the pawl end adapted to the direction of the teeth of the locking rack; a locking spring, connected between the locking pawl and the frame, used to press the locking pawl against the locking rack; and a release lever, fixedly connected to the locking pawl, used to pull the locking pawl away from the locking rack under external force. When the linkage push rod descends, the inclined surface of the teeth of the locking rack pushes the locking pawl outwards to avoid impact. After the linkage push rod reaches its position, the locking pawl, under the action of the locking spring, engages between adjacent teeth, preventing the linkage push rod from resetting upwards. By adopting the above technical solution, the self-locking component automatically locks the linkage push rod after it is pressed down to its position, effectively preventing the linkage push rod from rebounding due to air pressure fluctuations or vibrations during the pressing process, ensuring the stability and reliability of the pressing force and pressing stroke, and improving the product qualification rate.

[0011] Preferably, the press-fitting actuator includes: a mounting beam fixed to the top of the frame; a press-fitting cylinder fixedly mounted on the mounting beam, with the piston rod of the press-fitting cylinder extending vertically downwards; a press head seat fixedly connected to the lower end of the piston rod of the press-fitting cylinder, the press head seat being the end of the press-fitting stroke; a preload spring sleeve sleeved around the outer circumference of the piston rod of the press-fitting cylinder, the upper end of the preload spring sleeve fixed to the mounting beam, and the lower end having a pressure ring; a preload spring disposed inside the preload spring sleeve, abutting between the mounting beam and the pressure ring; when the piston rod of the press-fitting cylinder extends, the press head seat first contacts the chain link pin, and then the pressure ring, under the action of the preload spring, presses against the upper surface of the outer chain plate of the chain link, achieving pre-tightening before press-fitting. By adopting the above technical solution, a preload is applied to the workpiece before press-fitting using the preload spring and pressure ring, pre-aligning and tightening the outer chain plate with the pin hole, effectively preventing workpiece displacement during press-fitting, and significantly improving the alignment accuracy and surface quality of press-fitting.

[0012] Preferably, the rotary table also has a positioning scale ring on its circumferential edge, and a corresponding pointer is provided on the fixed base. When different selection positions are rotated to the position facing the pressing actuator, the corresponding scale of the positioning scale ring aligns with the pointer. By adopting the above technical solution, operators can intuitively confirm whether the rotary table has been accurately switched to the target position by observing the alignment of the scale ring and the pointer, which facilitates manual monitoring and debugging and improves the operability and reliability of the equipment.

[0013] Preferably, a linear bearing is provided between the linkage push rod and the frame, with the linkage push rod passing through the linear bearing; a rotary bearing is provided between the drive lever and the fixed chassis, with the drive lever hinged to the fixed chassis via the rotary bearing. By adopting the above technical solution, the linear bearing and rotary bearing effectively reduce sliding and rotational friction, making the movement of the linkage push rod and drive lever more flexible and smooth, and improving the response speed and durability of the entire linkage selection mechanism.

[0014] In summary, the present invention has at least the following beneficial effects: 1. Because this invention converts the linear motion of the pressing actuator into the rotational motion of the rotary table through the linkage push rod and drive lever, it realizes the pure mechanical linkage between the pressing action and the selection station switching, and achieves the technical effect of automatically adapting to different diameter pins without the need for external power and electrical control system, which significantly improves production efficiency and equipment versatility.

[0015] 2. In this invention, it is preferred to use a ratchet assembly that corresponds one-to-one with the selection station of the rotary table. Since the ratchet mechanism has precise stepping and one-way locking characteristics, it ensures that the rotary table rotates at the same angle every time and can be reliably locked during pressing, thereby ensuring the absolute accuracy of the selection and positioning and the stability of the pressing process.

[0016] 3. In this invention, a selection station consisting of a V-shaped support surface and an elastic top support is preferably adopted. Since the V-shaped surface has a self-centering function and the elastic element can absorb impact, it can achieve stable support and buffer protection for pins of different diameters, effectively preventing damage to the pins during press fitting. Attached Figure Description

[0017] Figure 1 This is a front view of a press-fitting device for assembling multi-size chain links.

[0018] Figure 2 This is a schematic diagram of the back of a press-fitting device for assembling multi-size chain links.

[0019] Figure 3 This is a schematic diagram of the left side of a press-fitting device for assembling multi-size chain links.

[0020] Figure 4 This is a schematic diagram on the right side of a press-fitting device for assembling multi-size chain links.

[0021] Figure 5 This is a top view of a press-fitting device for assembling multi-size chain links.

[0022] Figure 6 This is a bottom view of a press-fitting device for assembling multi-size chain links.

[0023] Figure 7 This is a schematic diagram of the overall structure of a press-fitting device for assembling multi-size chain links.

[0024] Figure 8 A schematic diagram of the internal structure of a press-fitting device for assembling multi-size chain links. Explanation of reference numerals in the attached drawings: 1. Frame; 2. Pressing actuator; 21. Mounting beam; 22. Pressing cylinder; 23. Press head seat; 24. Preload spring sleeve; 241. Pressure ring; 25. Preload spring; 3. Workpiece positioning mechanism; 31. First clamping arm; 311. First positioning fork; 32. Second clamping arm; 321. Second positioning fork; 33. Linkage clamping rod; 34. Swing transmission arm; 341. Waist-shaped sliding hole; 35. Drive pin; 4. Linkage selection mechanism; 41. Fixed chassis; 42. Rotary. 421. Selection station; 4211. V-shaped support surface; 4212. Elastic top support; 4213. Top support block; 4214. Top support spring; 422. Slot; 43. Drive lever; 431. Fork; 44. Linkage push rod; 45. Ratchet assembly; 451. Ratchet; 452. Pad; 453. Return torsion spring; 47. Linear bearing; 46. Rotary bearing; 5. Self-locking assembly; 51. Locking rack; 52. Locking pawl; 521. Locking tooth; 53. Locking spring; 54. Release lever. Detailed Implementation

[0025] The present application will be further described below with reference to the accompanying drawings:

[0026] Example 1 This embodiment discloses a press-fitting device for assembling multi-size chain links, including a frame 1, a press-fitting actuator 2, a workpiece positioning mechanism 3, and a linkage selection mechanism 4.

[0027] The frame 1 serves as the supporting skeleton for the entire equipment and is welded from high-strength steel. The pressing actuator 2 is fixedly installed on the upper part of the frame 1. The linkage selection mechanism 4 is located in the middle of the frame 1 and directly below the pressing actuator 2. The workpiece positioning mechanism 3 is mounted on the frame 1 and located on both radial sides of the linkage selection mechanism 4.

[0028] The linkage selection mechanism 4 is the core of the equipment, comprising a fixed base 41, a rotary table 42, a drive lever 43, and a linkage push rod 44. The fixed base 41 is horizontally fixed to the frame 1 by bolts. The rotary table 42 is rotatably mounted on the fixed base 41 via a central bearing and can rotate freely around a vertical axis. The upper surface of the rotary table 42 has eight selection stations 421 of different sizes evenly distributed along its circumference. Each selection station 421 has a concave support structure, and the height of the support surface of each station is designed to correspond to chain link pins of different diameters. For example, station one is suitable for pins with a diameter of 8mm, station two is suitable for pins with a diameter of 10mm, and so on, up to a diameter of 22mm.

[0029] The middle part of the drive lever 43 is hinged to the lower part of the fixed base 41 by a pin. One end (i.e., the front end) of the drive lever 43 is provided with a U-shaped shift fork 431, which extends upward and engages in a shift groove 422 opened on the outer peripheral wall of the rotary table 42. The number of shift grooves 422 is the same as the number of selection stations 421, which is also eight. The other end (i.e., the rear end) of the drive lever 43 is hinged to the lower end of the linkage push rod 44 by a spherical bearing.

[0030] The linkage push rod 44 is vertically slidably mounted on the frame 1. A linear bearing 47 is provided between the frame 1 and the linkage push rod 44, and the linkage push rod 44 passes through the linear bearing 47 to ensure the straightness and smoothness of its vertical sliding. The upper end of the linkage push rod 44 always abuts against the lower surface of the pressing stroke end of the pressing actuator 2 (i.e., the pressing head seat 23 in the following text).

[0031] The workpiece positioning mechanism 3 is used to fix the outer chain plate of the chain link to be pressed. It includes a first clamping arm 31, a second clamping arm 32, a linkage clamping rod 33, a swing transmission arm 34, and a drive pin 35. The first clamping arm 31 is fixed, with one end fixedly mounted on the frame 1 and located on one side of the linkage selection mechanism 4 along the radial direction. Its end has a first positioning fork 311 with an inward opening. The second clamping arm 32 is slidably mounted on the frame 1 and located on the other side of the linkage selection mechanism 4 along the radial direction. Its end has a second positioning fork 321 that is directly opposite the first positioning fork 311 and has an inward opening. The second clamping arm 32 can slide linearly back and forth relative to the first clamping arm 31. The middle part of the swing transmission arm 34 is hinged to the frame 1. One end of it is hinged to the second clamping arm 32 through the linkage clamping rod 33, and the other end has a waist-shaped sliding hole 341. The drive pin 35 is fixedly mounted on the side wall of the linkage push rod 44 and passes through the waist-shaped sliding hole 341.

[0032] In addition, the device is equipped with a self-locking assembly 5, which includes a locking rack 51, a locking pawl 52, a locking spring 53, and a release lever 54. The locking rack 51 is vertically fixed to the side of the linkage push rod 44, with its teeth inclined upwards. The locking pawl 52 is hinged to the frame 1, and its pawl end is provided with locking teeth 521 adapted to the direction of the teeth of the locking rack 51. The locking spring 53 is connected between the locking pawl 52 and the frame 1, and always presses the locking pawl 52 against the locking rack 51. The release lever 54 is fixedly connected to the locking pawl 52 and is used to manually release the locking pawl 52.

[0033] The implementation principle of Example 1 is as follows: In the initial state, the press head seat 23 of the press-fitting actuator 2 is located at the top. The operator places the chain link to be pressed (including the pin and the outer chain plate) on a selection station 421 that is currently facing the press head seat 23, and places the outer chain plate between the first clamping arm 31 and the second clamping arm 32. The equipment is started, the piston rod of the press-fitting cylinder 22 extends, and pushes the press head seat 23 downward. When the press head seat 23 moves downward, it first pushes the linkage push rod 44 to slide downward along the linear bearing 47. During the downward movement of the linkage push rod 44, on the one hand, through the cooperation of the drive pin 35 and the waist-shaped sliding hole 341, it pushes the swing transmission arm 34 to swing, and then through the linkage clamping link 33, it pulls the second clamping arm 32 to slide towards the first clamping arm 31, so that the two positioning forks 311 and 321 clamp the outer chain plate from both sides. On the other hand, the lower end of the linkage push rod 44 pushes the rear end of the drive lever 43 to swing downward, causing the drive lever 43 to rotate around its central hinge point. The fork 431 at its front end swings upward, actuating the slot 422 on the rotary table 42, driving the rotary table 42 to rotate one position, so that the next selection position 421 is precisely positioned directly below the pressure head seat 23. During this process, the locking claw 52 of the self-locking assembly 5, under the action of the locking spring 53, slides along the inclined surface of the locking rack 51 and engages between the teeth, preventing the linkage push rod 44 from springing back during the pressing process. The pressure head seat 23 continues to descend, completing the pressing of the pin. After pressing, the pressing cylinder 22 drives the pressure head seat 23 to rise and reset. The operator can unlock it by moving the release lever 54, or by relying on the pulling force of the pressure head seat 23 on the linkage push rod 44 when it rises, causing the self-locking assembly 5 to unlock, the linkage push rod 44 to move upward, and the various mechanisms to reset, preparing for the next pressing.

[0034] Example 2

[0035] The difference in this embodiment lies in the alternative structure of the pressing actuator 2. As an improvement on embodiment 1, the pressing actuator 2 in this embodiment also includes a pre-pressing function. Specifically, it includes a mounting beam 21, a pressing cylinder 22, a pressing head seat 23, a pre-pressing spring sleeve 24, and a pre-pressing spring 25. The mounting beam 21 is fixed to the top of the frame 1. The pressing cylinder 22 is fixed to the mounting beam 21, and its piston rod extends vertically downward. The pressing head seat 23 is fixedly connected to the lower end of the piston rod. The pre-pressing spring sleeve 24 is sleeved on the outer periphery of the piston rod, with its upper end fixed to the mounting beam 21 and its lower end provided with a pressure ring 241. The pre-pressing spring 25 is disposed inside the sleeve 24 and abuts against the mounting beam 21 and the pressure ring 241. During pressing, the pressing head seat 23 first contacts the pin, and then the pressure ring 241 is pressed against the upper surface of the outer chain plate under the action of the pre-pressing spring 25, achieving pre-pressing before pressing. This alternative solution adds a pre-pressing function, which can further improve the pressing accuracy. Its working principle differs from that of Embodiment 1 in that after the pressure head seat 23 contacts the pin, the pressure ring 241 first presses the outer chain plate to eliminate the workpiece gap, and then the pressure head seat 23 applies the main pressing force.

[0036] Example 3

[0037] The difference in this embodiment is that the self-locking component 5 can be omitted. In certain application scenarios, such as when the pressing force is small or the equipment stability is extremely high, the self-locking component 5 can be omitted. In this case, the locking of the linkage push rod 44 is maintained entirely by the continuous downward pressure of the pressing actuator 2. When the pressure head seat 23 rises, the linkage push rod 44 rises along with it under its own weight and the action of the return spring (if any). This solution simplifies the structure and reduces costs, but its anti-interference ability during the pressing process is relatively weak. Its working principle is basically the same as that of Embodiment 1, only the self-locking and unlocking steps are omitted.

[0038] Example 4

[0039] The difference in this embodiment lies in the alternative structure of the selection station 421. As an optimization of Embodiment 1, each selection station 421 includes a radially concave V-shaped support surface 4211 and an elastic support member 4212 at the bottom. The elastic support member 4212 includes a support block 4213 and a support spring 4214. The support block 4213 is slidably disposed in a groove at the bottom of the station, and the support spring 4214 is disposed in the groove, lifting the support block 4213 upward. The upper end surface of the support block 4213 is an arc surface adapted to the pin shaft. This solution achieves self-centering through the V-shaped surface and provides buffering and support force through the elastic support. Its working principle is as follows: when the pin is placed in the selection station 421, the V-shaped support surface 4211 automatically centers it, and at the same time, the pin compresses the top support block 4213, causing it to slide downward against the force of the top support spring 4214, thereby obtaining a stable support and absorbing the impact during press-fitting.

[0040] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A press-fitting device for assembling multi-size chain links, comprising a frame (1), a press-fitting actuator (2), and a workpiece positioning mechanism (3), wherein the press-fitting actuator (2) is mounted on the upper part of the frame (1), characterized in that: It also includes a linkage selection mechanism (4), which is set on the frame (1) and located below the pressing execution mechanism (2). The linkage selection mechanism (4) includes: a fixed base (41), which is fixedly installed on the frame (1); and a rotary table (42), which is rotatably installed on the fixed base (41). The rotary table (42) is rotatably set around a vertical axis, and multiple different sizes are distributed on the rotary table (42) along the circumferential direction. The selection station (421) has a different support surface height and corresponds to a chain link pin of different diameter; the drive lever (43) is hinged to the fixed base (41), and one end of the drive lever (43) is provided with a fork (431). The fork (431) cooperates with the groove (422) on the outer peripheral wall of the rotary table (42) to rotate the rotary table (42) to switch the selection station (421). The linkage push rod (44) is vertically slidably mounted on the frame (1). The upper end of the linkage push rod (44) abuts against the pressing stroke end of the pressing actuator (2), and the lower end of the linkage push rod (44) is hinged to the other end of the drive lever (43). When the pressing actuator (2) presses downward, the pressing stroke end pushes the linkage push rod (44) downward, and the linkage push rod (44) drives the drive lever (43) to swing. The fork (431) moves the rotary table (42) to rotate, so that the selection station (421) corresponding to the current chain link pin diameter rotates to the position directly opposite the pressing actuator (2).

2. The press-fitting equipment for assembling multi-size chain links according to claim 1, characterized in that: The linkage selection mechanism (4) further includes a ratchet assembly (45), which includes: A ratchet (451) is fixedly installed at the bottom of the rotary table (42). The number of teeth of the ratchet (451) is the same as the number of the selection station (421) and they correspond one-to-one. A pawl (452) is hinged to the fixed base (41), and the pawl (452) engages with the tooth groove of the ratchet (451); A reset torsion spring (453) is sleeved on the hinge shaft of the pawl (452) and is used to provide the pawl (452) with an elastic force pressing against the ratchet (451); When the pressing actuator (2) completes each pressing and resets upward, the linkage push rod (44) moves upward accordingly, the drive lever (43) swings in the opposite direction, and the fork (431) drives the rotary table (42) to rotate to the next selection station (421) facing the pressing actuator (2), and the pawl (452) engages in the corresponding tooth groove to lock the rotary table (42).

3. The press-fitting equipment for assembling multi-size chain links according to claim 1, characterized in that: Each of the selection stations (421) includes a V-shaped support surface (4211) formed radially inward and an elastic support member (4212) disposed at the bottom of the V-shaped support surface (4211), the elastic support member (4212) including: The top support block (4213) is slidably disposed in the bottom groove of the selection station (421); A top support spring (4214) is provided in the bottom slide groove. One end of the top support spring (4214) abuts against the bottom of the bottom slide groove, and the other end abuts against the top support block (4213) to push the top support block (4213) upward. The upper surface of the top support block (4213) is an arc surface that fits the outer wall of the pin.

4. The press-fitting equipment for assembling multi-size chain links according to claim 1, characterized in that: The workpiece positioning mechanism (3) includes: The first clamping arm (31) is fixedly installed on the frame (1) and located on one side of the linkage selection mechanism (4) in the radial direction. The end of the first clamping arm (31) is provided with a first positioning fork (311). The second clamping arm (32) is slidably mounted on the frame (1) and located on the other side of the linkage selection mechanism (4) in the radial direction. The end of the second clamping arm (32) is provided with a second positioning fork (321) opposite to the first positioning fork (311). The linkage clamping link (33) is hinged at one end to the second clamping arm (32); The swing transmission arm (34) is hinged in the middle to the frame (1). One end of the swing transmission arm (34) is hinged to the other end of the linkage clamping rod (33). The other end of the swing transmission arm (34) is provided with a waist-shaped sliding hole (341). The drive pin (35) is fixedly mounted on the linkage push rod (44), and the drive pin (35) passes through the waist-shaped sliding hole (341); When the linkage push rod (44) moves downward, the drive pin (35) slides in the waist-shaped sliding hole (341) and pushes the swing transmission arm (34) to swing. The swing transmission arm (34) pulls the second clamping arm (32) towards the first clamping arm (31) through the linkage clamping link (33), so that the first positioning fork (311) and the second positioning fork (321) clamp the outer chain plate of the chain link from both sides.

5. The press-fitting equipment for assembling multi-size chain links according to claim 1, characterized in that: It also includes a self-locking component (5), which comprises: A locking rack (51) is vertically fixed to the side of the linkage push rod (44), with the teeth of the locking rack (51) tilted upwards. The locking claw (52) is hinged to the frame (1), and the claw end of the locking claw (52) is provided with locking teeth (521) that are adapted to the tooth direction of the locking rack (51). A locking spring (53) is connected between the locking pawl (52) and the frame (1) to press the locking pawl (52) against the locking rack (51). Release lever (54), which is fixedly connected to the locking pawl (52), is used to push the locking pawl (52) away from the locking rack (51) under the action of external force. When the linkage push rod (44) moves downward, the inclined surface of the teeth of the locking rack (51) pushes the locking pawl (52) to move outward. After the linkage push rod (44) is in place, the locking pawl (52) is engaged between adjacent teeth under the action of the locking spring (53), preventing the linkage push rod (44) from moving upward and resetting.

6. The press-fitting equipment for assembling multi-size chain links according to claim 1, characterized in that: The press-fitting actuator (2) includes: Install the crossbeam (21) and fix it to the top of the frame (1); A press-fit cylinder (22) is fixedly installed on the mounting beam (21), and the piston rod of the press-fit cylinder (22) extends vertically downward; The pressure head seat (23) is fixedly connected to the lower end of the piston rod of the pressing cylinder (22), and the pressure head seat (23) is the pressing stroke end; A preload spring sleeve (24) is sleeved on the outer periphery of the piston rod of the press-fit cylinder (22). The upper end of the preload spring sleeve (24) is fixed to the mounting beam (21), and the lower end is provided with a pressure ring (241). A preload spring (25) is disposed inside the preload spring sleeve (24) and abuts against the mounting beam (21) and the pressure ring (241); When the piston rod of the press cylinder (22) extends, the press head seat (23) first contacts the chain link pin, and then the pressure ring (241) presses against the upper surface of the outer chain plate of the chain link under the action of the pre-compression spring (25) to achieve pre-compression before press-fitting.

7. The press-fitting equipment for assembling multi-size chain links according to claim 1, characterized in that: The circumferential edge of the rotary table (42) is also provided with a positioning scale ring, and the fixed base (41) is provided with a corresponding pointer. When different selection stations (421) are rotated to the position facing the pressing actuator (2), the corresponding scale of the positioning scale ring is aligned with the pointer.

8. The press-fitting equipment for assembling multi-size chain links according to claim 1, characterized in that: A linear bearing (47) is provided between the linkage push rod (44) and the frame (1), and the linkage push rod (44) passes through the linear bearing (47); a rotary bearing (46) is provided between the drive lever (43) and the fixed chassis (41), and the drive lever (43) is hinged to the fixed chassis (41) through the rotary bearing (46).

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