CN111215875B - Piston assembly mechanism - Google Patents
Piston assembly mechanism Download PDFInfo
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- CN111215875B CN111215875B CN202010228120.2A CN202010228120A CN111215875B CN 111215875 B CN111215875 B CN 111215875B CN 202010228120 A CN202010228120 A CN 202010228120A CN 111215875 B CN111215875 B CN 111215875B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/02—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same
- B23P19/027—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same using hydraulic or pneumatic means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/001—Article feeders for assembling machines
- B23P19/006—Holding or positioning the article in front of the applying tool
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- Mechanical Engineering (AREA)
- Automatic Assembly (AREA)
Abstract
The invention provides a piston assembly mechanism, comprising: the loading platform is used for placing the piston; the vertical reciprocating device is arranged above the loading platform and is used for fixing the piston on the loading platform; according to the piston assembling mechanism, the transverse reciprocating devices are arranged on the two sides of the vertical reciprocating device, the transverse reciprocating devices firstly shape the sealing ring of the piston and then guide the sealing ring in the process of assembling the shell to the piston, so that the sealing ring of the piston is prevented from being turned over in the process of assembling the sealing ring into the shell, and the assembling qualification rate of the piston is obviously improved.
Description
Technical Field
The invention relates to the technical field of automobile part processing devices, in particular to a piston assembling mechanism.
Background
The automobile gear shifting mechanism actuator is mostly used for controlling gear shifting of a vehicle gearbox, and in the process that a piston of an existing actuator is assembled to a shell, because a sealing ring on the piston is in interference fit with the shell, a large friction force exists between the lip edge of the sealing ring and the inner wall of the shell, and the lip edge of the sealing ring is easy to turn over and cause poor assembly of the piston.
Disclosure of Invention
In view of the above, the present invention is directed to a piston assembly mechanism that is intended to solve at least one of the above problems to at least some extent.
To solve the above problems, the present invention provides a piston assembling mechanism, including: the loading platform is used for placing the piston; the vertical reciprocating device is arranged above the loading platform and is used for fixing the piston on the loading platform; the transverse reciprocating device is oppositely arranged on two sides of the vertical reciprocating device, moves towards the direction far away from the vertical reciprocating device and is used for shaping a sealing ring of the piston, and moves towards the direction close to the vertical reciprocating device and is used for guiding in the process of assembling the shell on the piston; a loading device disposed on the loading station for fitting a housing onto the piston.
Optionally, the vertical reciprocating device comprises a vertical cylinder, a cylinder rod of the vertical cylinder is provided with a mounting plate, the mounting plate is further provided with a clamping piece, the two sides of the clamping piece on the mounting plate are oppositely provided with the transverse reciprocating device, and the clamping piece is suitable for being clamped on the outer side wall of the piston.
Optionally, the transverse reciprocating device comprises a transverse cylinder, a cylinder body of the transverse cylinder is fixedly connected with the mounting plate, a cylinder rod of the transverse cylinder is fixedly connected with a connecting plate, and a shaping assembly and a guide assembly are arranged on the connecting plate in parallel.
Optionally, the shaping assembly comprises a first cylinder, a cylinder body of the first cylinder is fixedly connected with the connecting plate, a driving end of the first cylinder is connected with a shaping clamping jaw, the shaping clamping jaw is closed to form an annular inner cavity, and the inner diameter of the annular inner cavity is suitable for being matched with the outer diameter of the piston.
Optionally, the guide assembly includes a second cylinder, a cylinder body of the second cylinder and the connecting plate are fixedly connected, a driving end of the second cylinder is connected with a guide clamping jaw, the guide clamping jaw is closed to form a conical inner cavity, and an inner diameter of the conical inner cavity gradually decreases in a direction away from the vertical reciprocating device.
Optionally, the inner diameter of the conical inner cavity away from the port of the vertical reciprocating device and the inner diameter of the annular inner cavity are equal in size.
Optionally, the taper of the cavity wall of the tapered inner cavity is 10-12.5 degrees.
Optionally, the loading device comprises: a slide rail disposed on the loading table; the sliding cylinder is arranged on the sliding rail and can move along the sliding rail; the base, the base sets up on the sliding cylinder, the base is used for placing the casing.
Optionally, the pressing device further comprises a pressing cylinder, the pressing cylinder is fixedly connected with the cylinder body of the transverse cylinder, a cylinder rod of the pressing cylinder is provided with a pressing piece, and the pressing piece is used for pressing the shell.
Optionally, the cylinder body of the vertical cylinder and the fixed plate are fixedly connected, the fixed plate is located on two sides of the vertical cylinder and provided with fixing parts, guide rods penetrate through the fixing parts, and the lower ends of the guide rods are fixedly connected with the mounting plate.
Compared with the prior art, the piston assembling mechanism has the following advantages:
according to the piston assembling mechanism, the transverse reciprocating devices are arranged on the two sides of the vertical reciprocating device and firstly reshape the sealing ring of the piston, and then guide is carried out in the process that the shell is assembled to the piston, so that the sealing ring of the piston is prevented from being turned over in the process of being assembled into the shell, and the assembling qualified rate of the piston is remarkably improved.
Drawings
FIG. 1 is a schematic structural view of a piston assembly mechanism according to an embodiment of the present invention;
FIG. 2 is an enlarged view of the structure at A in FIG. 1;
FIG. 3 is a schematic structural diagram of a loading device according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a reforming assembly according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a guide assembly according to an embodiment of the present invention;
fig. 6 is a schematic cross-sectional view of a tapered lumen according to an embodiment of the present invention.
Description of reference numerals:
100. the device comprises a piston, 200, a shell, 1, a loading platform, 2, a vertical reciprocating device, 21, a vertical air cylinder, 22, a mounting plate, 23, a clamping piece, 3, a horizontal reciprocating device, 31, a horizontal air cylinder, 32, a connecting plate, 33, a shaping assembly, 331, a first air cylinder, 332, a shaping clamping jaw, 333, an annular inner cavity, 34, a guide assembly, 341, a second air cylinder, 342, a guide clamping jaw, 343, a conical inner cavity, 4, a loading device, 41, a sliding rail, 42, a sliding air cylinder, 43, a base, 5, a pressing device, 51, a pressing air cylinder, 52, a pressing piece, 6, a fixing plate, 7, a fixing piece, 8 and a guide rod.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
An XY coordinate system is provided herein, wherein a forward direction of the X axis represents a right direction, a reverse direction of the X axis represents a left direction, a forward direction of the Y axis represents an upper direction, and a reverse direction of the Y axis represents a lower direction.
In addition, the following description will be briefly made with reference to the orientation: the following directional or positional relationships, as referred to with respect to "upper", "lower", "left", "right", etc., of each structural member, refer to the orientation or positional relationship shown in the drawings; "lateral" means the X-axis direction and "vertical" means the Y-axis direction, and these positional relationships are for convenience of description and simplicity of description only and do not indicate or imply that the device being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The automobile gear shifting mechanism actuator is mainly used for controlling gear shifting of a vehicle gearbox, and has higher sealing requirement, in order to achieve better sealing effect, a sealing ring is usually sleeved on a piston to seal an inner cavity of a shell, the piston of the existing actuator is assembled to the shell, because the sealing ring on the piston and the shell are in interference fit, a lip edge of the sealing ring is thin and long, the extending direction of the lip edge of the sealing ring is opposite to the assembling direction of the shell and the piston, larger friction force is generated between the lip edge of the sealing ring and the inner wall of the shell, and the lip edge of the sealing ring is easy to turn over, so that the sealing ring cannot well seal the inner cavity of the shell, and poor assembly of the piston is caused.
According to the invention, by improving the assembling equipment of the piston and the shell, the sealing ring of the piston is shaped before the piston and the shell are assembled, so that the sealing ring is deformed, and the guide is carried out in the assembling process of the piston and the shell, so that the piston and the shell are ensured to be assembled smoothly, the sealing ring is not flanged, and the assembling qualified rate of the piston is obviously improved.
As shown in fig. 1, an embodiment of the present invention provides a piston assembling mechanism, including a loading table 1, where the loading table 1 is used for placing a piston 100; specifically, a clamp for placing a piston is assembled on the loading table, after the piston is placed in the clamp, two ends of the piston are suspended on the loading table, so that the loading device can assemble the shell on the piston, and a vertical reciprocating device 2 is arranged above the loading table 1, wherein the vertical reciprocating device 2 is used for fixing the piston 100 on the loading table 1; the vertical reciprocating motion device realizes the fixation or release of the piston through reciprocating motion in the vertical direction. The vertical direction can perform reciprocating motion in the Y-axis direction, the transverse reciprocating motion device 3 is arranged on two sides of the vertical reciprocating motion device 2 oppositely, the transverse reciprocating motion device can perform shaping and guiding on a sealing ring of a piston through reciprocating motion in the horizontal direction, the horizontal direction refers to the reciprocating motion in the X-axis direction, specifically, the transverse reciprocating motion device 3 moves towards the direction far away from the vertical reciprocating motion device 2 to shape the sealing ring of the piston 100, and the transverse reciprocating motion device 3 moves towards the direction close to the vertical reciprocating motion device 2 to guide in the process of assembling a shell 200 onto the piston 100; a loading device 4, the loading device 4 being provided on the loading table 1, the loading device 4 being used to assemble the housing 200 to the piston 100.
According to the piston assembling mechanism, the transverse reciprocating devices are arranged on the two sides of the vertical reciprocating device, after the piston is fixed by the vertical reciprocating device, the transverse reciprocating device firstly shapes the sealing ring of the piston and then guides the sealing ring in the process of assembling the shell to the piston, so that the sealing ring of the piston is prevented from being turned over in the process of assembling the sealing ring into the shell, the qualified rate of piston assembling is remarkably improved, and the piston assembling can reach nearly 100% under ideal conditions.
As shown in fig. 2, the vertical reciprocating device 2 includes a vertical cylinder 21, a mounting plate 22 is disposed on a cylinder rod of the vertical cylinder 21, a clamping member 23 is further disposed on the mounting plate 22, the lateral reciprocating device 3 is disposed on the mounting plate 22 and located on two sides of the clamping member 23, an arc-shaped notch is disposed at a lower end of the clamping member, and the clamping member 23 is adapted to be engaged with an outer sidewall of the piston 100 through the arc-shaped notch to fix the piston on the loading platform.
As shown in fig. 2, the transverse reciprocating device 3 includes a transverse cylinder 31, a cylinder body of the transverse cylinder 31 is fixedly connected with the mounting plate 22, a connecting plate 32 is fixedly connected to a cylinder rod of the transverse cylinder 31, in this embodiment, the connecting plate is an L-shaped plate, one side of the connecting plate is fixedly connected to the cylinder rod of the transverse cylinder, and the other side of the connecting plate is provided with a shaping component 33 and a guide component 34 in parallel.
As shown in fig. 4, the shaping assembly 33 includes a first cylinder 331, a cylinder body of the first cylinder 331 is fixedly connected to the connecting plate 32, a driving end of the first cylinder 331 is connected to a shaping jaw 332, the first cylinder controls opening and closing of the shaping jaw, the shaping jaw 332 is closed to form an annular inner cavity 333, an inner diameter of the annular inner cavity 333 is adapted to match an outer diameter of the piston 100, in this embodiment, the inner diameter of the annular inner cavity is equal to or slightly larger than the outer diameter of the piston, preferably, the inner diameter of the annular inner cavity is equal to the outer diameter of the piston, which is the smallest inner diameter of the annular inner cavity, so that the shaping jaw can shape the sealing ring to the maximum extent, and ensure plastic deformation of the sealing ring, specifically, in a closed state of the shaping jaw, the transverse cylinder drives the shaping jaw to roll over the sealing ring, and the lip edge of the sealing ring is slightly deformed in a very short time by using the, so as to compress and reduce the sealing ring in the guide clamping jaw, thereby smoothly assembling the piston in the shell, avoiding the turnover of the sealing ring and ensuring the assembly qualification rate of the piston.
As shown in fig. 5 and 6, the guide assembly 34 includes a second cylinder 341, a cylinder body of the second cylinder 341 is fixedly connected to the connecting plate 32, a driving end of the second cylinder 341 is connected to a guide clamping jaw 342, the second cylinder controls opening and closing of the guide clamping jaw, the guide clamping jaw 342 is closed to form a tapered inner cavity 343, an inner diameter of the tapered inner cavity 343 is gradually reduced in a direction away from the vertical reciprocating device 2, specifically, a maximum inner diameter of the tapered inner cavity is larger than an outer diameter of the sealing ring, and a minimum inner diameter of the tapered inner cavity is equal to an outer diameter of the piston, in this embodiment, in a process of assembling the housing to the piston by the loading device, the loading device pushes the housing to move, at this time, since the guide clamping jaw is in a closed state, the housing is in contact with the guide clamping jaw, since the transverse cylinder can also perform a telescopic movement under an external force, the, the reshaped sealing ring is gradually compressed and reduced in the guide clamping jaw until the whole size of the sealing ring is smaller than that of the shell, and then the sealing ring is smoothly inserted into the shell.
In this embodiment, the sealing washer of piston is earlier through the plastic deformation of plastic subassembly, utilizes the material characteristic of sealing washer, makes it take place small deformation, and the lip limit external diameter of sealing washer diminishes promptly, then is gradually extrudeing the sealing washer through the direction subassembly, makes the external diameter of sealing washer reduce to make the piston smoothly assemble in the casing, and the sealing washer of piston can not the turn-ups.
The inner diameter of the port of the conical inner cavity 343, which is far away from the vertical reciprocating motion device 2, is equal to the inner diameter of the annular inner cavity 333, that is, the inner diameter of the port of the conical inner cavity 343, which is far away from the vertical reciprocating motion device 2, is equal to the outer diameter of the piston, so that the annular inner cavity can shape the sealing ring to the maximum extent, the conical inner cavity can compress the sealing ring to the maximum extent, and therefore the piston can be smoothly assembled into the shell, and the sealing ring of the piston is not flanged.
The taper of the cavity wall of the tapered inner cavity 343 is 10 degrees to 12.5 degrees, and in the taper range of the embodiment, the guide effect of the guide clamping jaw on the sealing ring can be further ensured, so that the sealing ring is gradually compressed, and the sealing ring is prevented from being turned over.
As shown in fig. 3, the loading device 4 includes: a slide rail 41 provided on the loading table 1; slide cylinder 42, slide cylinder 42 sets up on the slide rail 41 and can follow slide rail 41 removes, in this embodiment, because the both ends of piston all assemble the casing, slide cylinder's quantity is two, and two relative settings of slide cylinder are in vertical reciprocating motion device's both sides to two slide cylinder independently remove respectively, base 43 sets up slide cylinder 42 is last, base 43 is used for placing the casing, specifically, offers the recess that is used for placing the casing on the base, thereby the base can play the limiting displacement to the casing, makes the position of casing on the base stable, is convenient for assemble the casing to the piston.
As shown in fig. 2, a piston assembling mechanism further includes a pressing device 5, the pressing device 5 includes a pressing cylinder 51, the pressing cylinder 51 is fixedly connected with the cylinder body of the transverse cylinder 31, a cylinder rod of the pressing cylinder 51 is provided with a pressing member 52, and the pressing member 52 is used for pressing the housing 200. In this embodiment, compress tightly the piece and be the horizontal pole form, and horizontal length is greater than the stroke distance of casing to make the casing in with piston assembling process, compress tightly the piece and can sticis the casing all the time, guarantee the stable in position of casing in vertical direction, the assembly of being convenient for.
As shown in fig. 1, a piston assembly mechanism still includes fixed plate 6, the cylinder body of vertical cylinder 21 with fixed plate 6 fixed connection, be located on the fixed plate 6 the both sides of vertical cylinder 21 are provided with mounting 7, guide bar 8 is worn to be equipped with by mounting 7, the lower extreme of guide bar 8 with mounting panel 22 fixed connection, in vertical cylinder back and forth movement process, the guide bar can guarantee that the motion of vertical cylinder is more stable.
The method comprises the following steps: the piston is placed on a loading platform, a cylinder of a vertical cylinder moves downwards to drive a clamping piece to press a fixed piston, a cylinder rod of a pressing cylinder moves downwards to press a shell through the pressing piece, a shaping cylinder controls a shaping clamping jaw to close and a guide cylinder controls a guide clamping jaw to open, a cylinder rod of a transverse cylinder moves towards a direction far away from a vertical reciprocating device, a cylinder rod of a transverse cylinder moves to drive the shaping clamping jaw and the guide clamping jaw to move along with the cylinder rod, the shaping clamping jaw rolls over a sealing ring, the sealing ring is reduced within a very short time due to the material characteristics of the sealing ring, then the shaping cylinder controls the shaping clamping jaw to open and the guide cylinder controls the guide clamping jaw to close, a sliding cylinder on the loading platform drives the shell to move towards the direction of the vertical reciprocating device, the shell pushes the guide clamping jaw to move towards the direction of the vertical reciprocating device, and the shaped sealing ring is compressed and gradually reduced, and finally, the whole size of the sealing ring is smaller than that of the shell, the sealing ring is smoothly inserted into the shell, the guide clamping jaw is controlled to be opened by the guide cylinder, the cylinder rod of the vertical cylinder retracts, the cylinder rod of the pressing cylinder retracts, and the action is finished.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A piston assembly mechanism, comprising:
a loading table (1), wherein the loading table (1) is used for placing a piston (100);
the vertical reciprocating device (2), the vertical reciprocating device (2) is arranged above the loading platform (1), and the vertical reciprocating device (2) is used for fixing the piston (100) on the loading platform (1);
the transverse reciprocating device (3) is oppositely arranged on two sides of the vertical reciprocating device (2), the transverse reciprocating device (3) moves towards a direction far away from the vertical reciprocating device (2) for shaping a sealing ring of the piston (100), and the transverse reciprocating device (3) moves towards a direction close to the vertical reciprocating device (2) for guiding in the process of assembling the shell (200) on the piston (100);
-a loading device (4), said loading device (4) being arranged on said loading table (1), said loading device (4) being used for fitting said housing (200) to said piston (100).
2. The piston assembly mechanism according to claim 1, characterized in that the vertical reciprocating device (2) comprises a vertical cylinder (21), a mounting plate (22) is arranged on a cylinder rod of the vertical cylinder (21), a clamping piece (23) is further arranged on the mounting plate (22), the transverse reciprocating device (3) is oppositely arranged on the mounting plate (22) at two sides of the clamping piece (23), and the clamping piece (23) is suitable for being clamped on an outer side wall of the piston (100).
3. The piston assembling mechanism according to claim 2, characterized in that the transverse reciprocating device (3) comprises a transverse cylinder (31), the cylinder body of the transverse cylinder (31) is fixedly connected with the mounting plate (22), a connecting plate (32) is fixedly connected with the cylinder rod of the transverse cylinder (31), and a shaping assembly (33) and a guide assembly (34) are arranged on the connecting plate (32) in parallel.
4. The piston assembly mechanism according to claim 3, characterized in that the shaping assembly (33) comprises a first air cylinder (331), the cylinder body of the first air cylinder (331) is fixedly connected with the connecting plate (32), a shaping clamping jaw (332) is connected to the driving end of the first air cylinder (331), the shaping clamping jaw (332) is closed to form an annular inner cavity (333), and the inner diameter of the annular inner cavity (333) is suitable for being matched with the outer diameter of the piston (100).
5. Piston assembly mechanism according to claim 4, characterized in that the guide assembly (34) comprises a second cylinder (341), the cylinder body of the second cylinder (341) is fixedly connected with the connecting plate (32), a guide clamping jaw (342) is connected to the driving end of the second cylinder (341), the guide clamping jaw (342) is closed to form a conical inner cavity (343), and the inner diameter of the conical inner cavity (343) is gradually reduced in the direction away from the vertical reciprocating device (2).
6. Piston assembly mechanism according to claim 5, characterised in that the inner diameter of the conical inner cavity (343) remote from the port of the vertical reciprocating means (2) and the inner diameter of the annular inner cavity (333) are of equal size.
7. The piston assembly mechanism according to claim 5, wherein the taper of the wall of the tapered inner cavity (343) is 10 ° -12.5 °.
8. Piston assembly mechanism according to claim 1, characterised in that said loading means (4) comprise: a slide rail (41) provided on the loading table (1);
the sliding air cylinder (42) is arranged on the sliding rail (41) and can move along the sliding rail (41);
the base (43), base (43) set up on slide cylinder (42), base (43) are used for placing the casing.
9. The piston assembling mechanism according to claim 3, further comprising a pressing device (5), wherein the pressing device (5) comprises a pressing cylinder (51), the pressing cylinder (51) is fixedly connected with the cylinder body of the transverse cylinder (31), a cylinder rod of the pressing cylinder (51) is provided with a pressing piece (52), and the pressing piece (52) is used for pressing the shell (200).
10. The piston assembling mechanism according to claim 2, further comprising a fixing plate (6), wherein the cylinder body of the vertical cylinder (21) is fixedly connected with the fixing plate (6), fixing parts (7) are arranged on the fixing plate (6) and located on two sides of the vertical cylinder (21), guide rods (8) are arranged in the fixing parts (7) in a penetrating mode, and the lower ends of the guide rods (8) are fixedly connected with the mounting plate (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010228120.2A CN111215875B (en) | 2020-03-27 | 2020-03-27 | Piston assembly mechanism |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010228120.2A CN111215875B (en) | 2020-03-27 | 2020-03-27 | Piston assembly mechanism |
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| CN111215875A CN111215875A (en) | 2020-06-02 |
| CN111215875B true CN111215875B (en) | 2020-11-06 |
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| CN202010228120.2A Active CN111215875B (en) | 2020-03-27 | 2020-03-27 | Piston assembly mechanism |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111958543A (en) * | 2020-09-09 | 2020-11-20 | 湖南江滨机器（集团）有限责任公司 | Split type steel piston assembly quality |
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| CN207593184U (en) * | 2017-11-20 | 2018-07-10 | 盐城派威机械有限公司 | A kind of big interference volume elastic conjunction device suitable for ring cross-section |
| DE102017219361A1 (en) * | 2017-10-27 | 2019-05-02 | Robert Bosch Gmbh | Method for mounting a sealing collar on a hydraulic piston and mounting arrangement for the method |
| CN208961869U (en) * | 2018-09-04 | 2019-06-11 | 北京北机机电工业有限责任公司 | A kind of piston and oil barrel clamp for assembling |
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| JPH11320440A (en) * | 1998-05-15 | 1999-11-24 | Toyota Motor Corp | Cylinder seal, cylinder seal having seal ring, and assembly method for the seal ring |
| CN201120545Y (en) * | 2007-11-30 | 2008-09-24 | 天永机械电子(上海)有限公司 | Piston pin circlip assembling machine |
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| CN111215875A (en) | 2020-06-02 |
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