A piston pin assembly device

Abstract

The utility model discloses a piston positioning pin assembly device, including work table and setting on the work table press pin mechanism, pin positioning adjustment mechanism and piston rotary positioning mechanism, press pin mechanism and pin positioning adjustment mechanism cooperation are used for the positioning pin press into the corresponding position of piston, piston rotary positioning mechanism and pin positioning adjustment mechanism cooperation are used for positioning pin alignment mounting hole on the piston, the work table still is equipped with the button unit for controlling press pin mechanism and carries out the button unit of pressing action, piston rotary positioning mechanism installs on position adjustment unit. The utility model provides a piston positioning pin assembly device, can reduce the multiple clamping of piston positioning pin assembly time, and all pin assembly can be completed once clamping, realizes quick accurate positioning, and the efficiency of installing pin is higher.

Description

Technical Field

[0001] This utility model relates to the field of piston assembly equipment technology, and in particular to a piston positioning pin assembly device. Background Technology

[0002] During piston manufacturing, locating pins are typically installed in the piston ring grooves to prevent circumferential rotation of the piston rings. These pins are generally 1.2mm-1.4mm in diameter and 5mm-8mm in length. Due to the small size of the locating pins, the interference fit, and the limited space of the piston ring grooves (groove width 1.5mm-1.6mm), assembly is difficult, resulting in low accuracy and efficiency.

[0003] In existing assembly technologies, the assembly of pins with large dimensional and positioning tolerances has been automated. However, the assembly of small pins in special scenarios such as piston ring grooves has long relied on manual labor. First, the piston is manually placed on a positioning device and fixed. Then, the pin is manually placed into the locating pin mounting hole of the ring groove and hammered into position using a striking pin and a hammer. After each locating pin is installed, the positioning process is repeated, and the next locating pin is installed in the same way until all locating pins are installed.

[0004] The existing assembly technology has the following drawbacks: 1. Multiple clamping operations result in poor positioning accuracy, with a large deviation between the actual position of the pin and the required position. This positional deviation can also cause the firing pin to contact the edge of the piston ring groove, resulting in damage to the piston ring groove area; 2. Since the pin is an interference fit, and a certain distance must be maintained between the pin and the bottom of the assembly hole after assembly, manual assembly cannot effectively control the insertion depth of the pin, resulting in poor assembly consistency; 3. Manual assembly requires frequent clamping and hammering, which is not only labor-intensive but also inefficient, failing to meet the requirements of mass production. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a piston positioning pin assembly device, which can reduce the number of clamping operations during piston positioning pin assembly, and complete the assembly of all pins in one clamping operation, achieving fast and accurate positioning, and with high pin assembly efficiency.

[0006] The technical solution provided by this utility model is as follows: A piston positioning pin assembly device includes a worktable and a pin pressing mechanism, a pin positioning adjustment mechanism, and a piston rotation positioning mechanism disposed on the worktable. The pressing pin mechanism works in conjunction with the pin positioning and adjusting mechanism to press the positioning pin into the corresponding position of the piston. The piston rotation positioning mechanism works in conjunction with the pin positioning and adjustment mechanism to align the positioning pin with the mounting hole on the piston. The workbench is also equipped with a button unit for controlling the pressing mechanism to perform the pressing action. The piston rotation positioning mechanism is mounted on the position adjustment unit.

[0007] Preferably, the piston rotation positioning mechanism includes a fixed plate connected to the position adjustment unit, a frame mounted on the fixed plate, a rotating unit, and a tensioning unit. The rotating unit and the tensioning unit are connected by a gear assembly so that the tensioning unit can rotate under the drive of the rotating unit. The output end of the tensioning unit is equipped with a stop plate for piston positioning.

[0008] Preferably, the rotating unit includes a servo motor and a pinion gear disposed on the output shaft of the servo motor; The tensioning unit includes a tensioning cylinder, a tensioning shaft, a large gear, and a pull head. The tensioning shaft is rotatably connected to the output end of the tensioning cylinder. The large gear is sleeved and fixed on the tensioning shaft. The pull head is located at the end of the tensioning shaft and has a spindle on the pull head that cooperates with the piston pin hole to fix the piston. The pinion and gear mesh.

[0009] Preferably, the frame includes a support frame for supporting the tension cylinder, a rotary body seat for placing the end of the tension shaft, and a mounting plate for mounting the servo motor.

[0010] Preferably, the pressing pin mechanism includes a base and a support column disposed on the base, a second fixing plate disposed on the support column, and a pressing unit disposed on the second fixing plate; The pressing unit includes a pressing pin cylinder and a striking pin disposed at the output end of the pressing pin cylinder. The striking pin is connected to the pressing pin cylinder through a fixing sleeve.

[0011] Preferably, the position adjustment unit includes a lateral movement module and a longitudinal movement module.

[0012] Preferably, the pin positioning adjustment mechanism includes a bracket and a pin positioning block disposed on the bracket. The pin positioning block is provided with a placement hole for placing the positioning pin.

[0013] Preferably, the pin positioning block has an arc-shaped portion that matches the shape of the piston ring groove, and the placement hole is located within the arc-shaped portion.

[0014] Preferably, the placement hole adopts a funnel structure.

[0015] Preferably, the button unit includes two buttons, which are connected in series and positioned in adjacent locations on the work surface.

[0016] This invention has the following advantages over the prior art: 1. The piston positioning pin assembly device of this utility model can reduce the number of clamping operations during piston positioning pin assembly. All pins can be assembled in one clamping operation, achieving fast and accurate positioning. 2. The positioning of the piston positioning pin assembly device of this utility model can ensure the consistency of pin assembly and avoid collision damage during assembly. 3. The piston positioning pin assembly device of this utility model automatically installs pins, replacing manual actions, by setting up a pin pressing mechanism, a pin positioning adjustment mechanism and a piston rotation positioning mechanism, thereby improving the efficiency of pin installation and reducing the labor intensity of workers. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the piston positioning pin assembly device in an embodiment of the present invention; Figure 2 This is a side view of the piston positioning pin assembly device in an embodiment of the present invention; Figure 3 This is a schematic diagram of the piston rotation positioning mechanism in an embodiment of the present invention; Figure 4 This is a cross-sectional view of the piston rotation positioning mechanism in an embodiment of this utility model; Figure 5 This is a schematic diagram of the pin positioning block in an embodiment of the present invention.

[0019] Figure label: 1. Workbench; 2. Pin pressing mechanism; 21. Base; 22. Support column; 23. Fixing plate two; 24. Pressing unit; 241. Pin pressing cylinder; 242. Impact pin; 243. Fixing sleeve; 3. Pin positioning adjustment mechanism; 31. Bracket; 32. Pin positioning block; 321. Placement hole; 4. Piston rotary positioning mechanism; 41. Fixing plate one; 42. Frame; 421. Support frame; 422. Rotary main body seat; 423. Mounting plate; 43. Rotation unit; 431. Servo motor; 432. Pinion; 44. Tensioning unit; 441. Tensioning cylinder; 442. Tensioning shaft; 443. Large gear; 444. Pull head; 445. Spindle; 45. Gear assembly; 46. Stop plate; 5. Piston; 6. Button unit; 7. Position adjustment unit; 71. Lateral movement module; 72. Longitudinal movement module. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] like Figure 1-5 As shown, this utility model embodiment provides a piston positioning pin assembly device, including a worktable 1 and a pin pressing mechanism 2, a pin positioning adjustment mechanism 3, and a piston rotation positioning mechanism 4 disposed on the worktable 1. The pin pressing mechanism 2 and the pin positioning adjustment mechanism 3 cooperate to press the positioning pin into the corresponding position of the piston 5. The piston rotation positioning mechanism 4 and the pin positioning adjustment mechanism 3 cooperate to align the positioning pin with the mounting hole on the piston 5. The worktable 1 is also provided with a button unit 6 for controlling the pressing mechanism 2 to perform the pressing action. The piston rotation positioning mechanism 4 is mounted on a position adjustment unit 7.

[0022] In this embodiment, the piston rotation positioning mechanism 4 includes a fixed plate 41 connected to the position adjustment unit 7, a frame 42 mounted on the fixed plate 41, a rotating unit 43, and a tensioning unit 44. The rotating unit 43 and the tensioning unit 44 are connected by a gear assembly 45 so that the tensioning unit 44 can rotate under the drive of the rotating unit 43. The output end of the tensioning unit 44 is provided with a stop plate 46 for positioning the piston 5. The rotating unit 43 and the tensioning unit 44 can share a common control interface (human-machine interface, which can use existing disclosed control systems or methods for motors and cylinders), which facilitates the overall control of the piston rotation positioning mechanism 4. The position adjustment unit 7 can be used to adjust the position of the rotating unit 43 and the tensioning unit 44 mounted on the fixed plate 41. The rotating unit 43 and the tensioning unit 44 facilitate the adjustment of the position of the ring groove to be assembled on the piston 5, so that the ring groove to be assembled is aligned with the pin positioning adjustment mechanism 3, which facilitates the accurate insertion of the pin into the corresponding ring groove on the piston 5.

[0023] In this embodiment, the rotating unit 43 includes a servo motor 431 and a pinion 432 mounted on the output shaft of the servo motor 431; the tensioning unit 44 includes a tensioning cylinder 441, a tensioning shaft 442, a large gear 443, and a pull head 444. The tensioning shaft 442 is rotatably connected to the output end of the tensioning cylinder 441. The large gear 443 is sleeved and fixed on the tensioning shaft 442. The pull head 444 is located at the end of the tensioning shaft 442. The pull head 444 is provided with a spindle 445 that cooperates with the piston pin hole to fix the piston. The pinion 432 and the large gear 443 mesh together, forming a gear assembly 45. The meshing of the pinion 432 and the large gear 443 causes the tensioning shaft 442 to rotate under the drive of the large gear 443, thereby achieving the rotation of the pull head 444.

[0024] The positioning principle of the piston rotary positioning mechanism 4 in this embodiment is as follows: The positioning accuracy of the piston 5 directly affects the assembly quality. The positioning of the piston 5 is achieved through the piston rotary positioning mechanism 4. When the piston 5 is placed on the piston rotary positioning mechanism 4, the piston 5 is initially positioned by the stop plate 46. Then, the mandrel 445 is inserted into the piston pin hole and the pull head 444, and the piston is positioned again by the piston pin hole and the pull head 444. Finally, the piston 5 is locked by the tension cylinder 441 contracting and the tension shaft 442 locking the piston. To ensure the accuracy of the initial position of the piston 5, the piston rotary positioning mechanism 4 will return to zero by the servo motor 431 each time it is initially assembled. When switching the assembly and disassembly positions, the piston angle of the piston 5 can be switched by the piston rotary positioning mechanism 4. With the cooperation of the position adjustment unit 7, the position switching can be completed. The pinion 432 and the gear 443 complete the deceleration function.

[0025] In this embodiment, the frame 42 includes a support frame 421 for supporting the tension cylinder 441, a rotating main body seat 422 for placing the end of the tension shaft 442, and a mounting plate 423 for mounting the servo motor 431. The overall frame 42 has high reliability.

[0026] In this embodiment, the pin-pressing mechanism 2 includes a base 21, a support column 22 mounted on the base 21, a fixing plate 23 mounted on the support column 22, and a pressing unit 24 mounted on the fixing plate 23. The pressing unit 24 includes a pin-pressing cylinder 241 and a striking pin 242 mounted on the output end of the pin-pressing cylinder 241. The striking pin 242 is connected to the pin-pressing cylinder 241 via a fixing sleeve 243. The pin-pressing action is reliably completed by the movement of the pin-pressing cylinder 241 driving the movement of the striking pin 242.

[0027] In this embodiment, the position adjustment unit 7 includes a lateral movement module 71 and a longitudinal movement module 72, which enable the position adjustment of the piston rotation positioning mechanism 4.

[0028] In this embodiment, the pin positioning adjustment mechanism 3 includes a bracket 31 and a pin positioning block 32 disposed on the bracket 31. The pin positioning block 32 is provided with a placement hole 321 for placing the positioning pin. The bracket 31 can be configured to be height-adjustable and rotatable. By adjusting the bracket 31, the position of the pin positioning block 32 can be flexibly adjusted.

[0029] In this embodiment, to ensure that the positioning pin is quickly and accurately placed into the pin position to be pressed, the pin positioning block 32 is provided with an arc-shaped part that matches the shape of the piston ring groove. The placement hole 321 is located in the arc-shaped (circular arc) part. The placement hole 321 adopts a funnel structure, and the thin end part of the arc (the arc-shaped part that matches the shape of the piston ring groove) is embedded in the piston ring groove. This design can not only achieve quick guidance for the placement of the pin, but also ensure that the striking pin 242 will not drift when pressing the pin. The funnel structure of the placement hole 321 has the following advantages: (1) The upper part of the funnel-shaped structure has a larger space, which improves the placement efficiency of the positioning pin and plays a guiding role; (2) The lower part of the funnel-shaped structure has a smaller diameter, which is mainly to limit the position of the positioning pin (cylindrical pin) so that its position with the pin hole to be installed is within the tolerance range; (3) Because the diameter of the positioning pin and the striker 242 is small, the striker 242 will drift when it contacts the positioning pin during the pressing process of the presser cylinder 241, resulting in the failure of pressing the pin. The funnel structure can effectively prevent the striker 242 from drifting. The arc thickness of the thin end part is slightly smaller than the width of the annular groove of the piston 5 to be assembled. When the positioning pin is assembled, the thin end part is embedded in the annular groove. The main functions are: (1) quick positioning. After the thin end part is embedded in the annular groove, the position of the placement hole 321 is aligned with the position of the pin hole to be installed; (2) After the thin end part is embedded in the annular groove, the striker 242 can be prevented from drifting during assembly.

[0030] In this embodiment, the button unit 6 includes two buttons connected in series and positioned adjacent to each other on the work surface. The design of the two buttons, each corresponding to a hand, prevents the operator's hand from accidentally entering the movement trajectory of the pressing pin and causing injury.

[0031] The workflow of the piston positioning pin assembly device in this embodiment is as follows: The worker places the piston 5 to be fitted with a pin on the piston rotary positioning mechanism 4, clicks the locking button on the human-machine interface, and the piston is locked by the tensioning cylinder 441 on the piston rotary positioning mechanism 4. When the machine is started for the first assembly, each motion axis in this piston positioning pin assembly device needs to be zeroed. After the zeroing is completed, the first positioning pin of the annular groove is assembled. First, the pin positioning block 32 is placed in the annular groove to be assembled, and then the pin to be assembled is placed in the placement hole 321 on the pin positioning block 32. The worker presses the button unit 6 with both hands, and the pin pressing cylinder 241 automatically presses down and returns to the initial position after a certain period of time, thus completing the installation of the first positioning pin. Next, the operator manually removes the pin positioning block 32 and presses the secondary assembly button on the human-machine interface. The longitudinal movement module 72, the transverse movement module 71, and the pull head 444 automatically move to the position for installing the second positioning pin and place the pin positioning block 32 into the annular groove to be assembled. Then, the pin to be assembled is placed into the placement hole 321 of the pin positioning block 32. The operator presses the button unit 6 with both hands, and the pin pressing cylinder 241 automatically presses down and holds for a certain period of time before returning to its initial position, completing the installation of the second positioning pin. After completion, the operator manually removes the pin positioning block 32 and presses the assembly completion button on the human-machine interface. All moving mechanisms in this piston positioning pin assembly device automatically move to the zero position, the pin pressing cylinder 241 releases, and the operator manually removes the assembled piston 5.

[0032] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A piston locating pin assembly device, characterized in that, It includes a worktable and a pin-pressing mechanism, a pin positioning and adjustment mechanism, and a piston rotation positioning mechanism mounted on the worktable. The pressing pin mechanism works in conjunction with the pin positioning and adjusting mechanism to press the positioning pin into the corresponding position of the piston. The piston rotation positioning mechanism works in conjunction with the pin positioning and adjustment mechanism to align the positioning pin with the mounting hole on the piston. The workbench is also equipped with a button unit for controlling the pressing mechanism to perform the pressing action. The piston rotation positioning mechanism is mounted on the position adjustment unit.

2. The piston positioning pin assembly device according to claim 1, characterized in that, The piston rotation positioning mechanism includes a fixed plate connected to the position adjustment unit, a frame mounted on the fixed plate, a rotating unit, and a tensioning unit. The rotating unit and the tensioning unit are connected by a gear assembly so that the tensioning unit can rotate under the drive of the rotating unit. The output end of the tensioning unit is equipped with a stop plate for piston positioning.

3. The piston positioning pin assembly device according to claim 2, characterized in that, The rotating unit includes a servo motor and a small gear mounted on the output shaft of the servo motor. The tensioning unit includes a tensioning cylinder, a tensioning shaft, a large gear, and a pull head. The tensioning shaft is rotatably connected to the output end of the tensioning cylinder. The large gear is sleeved and fixed on the tensioning shaft. The pull head is located at the end of the tensioning shaft and has a spindle on the pull head that cooperates with the piston pin hole to fix the piston. The pinion and gear mesh.

4. The piston locating pin assembly device according to claim 3, characterized in that, The frame includes a support frame for supporting the tension cylinder, a rotating main body seat for placing the end of the tension shaft, and a mounting plate for mounting the servo motor.

5. The piston locating pin assembly device according to any one of claims 1-4, characterized in that, The pressing mechanism includes a base and a support column set on the base, a second fixing plate set on the support column, and a pressing unit set on the second fixing plate. The pressing unit includes a pressing pin cylinder and a striking pin disposed at the output end of the pressing pin cylinder. The striking pin is connected to the pressing pin cylinder through a fixing sleeve.

6. The piston locating pin assembly device according to any one of claims 1-4, characterized in that, The position adjustment unit includes a lateral movement module and a longitudinal movement module.

7. The piston locating pin assembly device according to any one of claims 1-4, characterized in that, The pin positioning and adjustment mechanism includes a bracket and a pin positioning block mounted on the bracket. The pin positioning block is provided with a placement hole for placing the positioning pin.

8. The piston locating pin assembly device according to claim 7, characterized in that, The pin positioning block has an arc-shaped portion that matches the shape of the piston ring groove, and the placement hole is located within the arc-shaped portion.

9. The piston locating pin assembly device according to claim 7, characterized in that, The placement hole adopts a funnel structure.

10. The piston locating pin assembly device according to any one of claims 1-4, characterized in that, The button unit includes two buttons, which are connected in series and positioned at adjacent locations on the work surface.

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