Piston press fitting device

Abstract

According to the piston press-fitting device, a piston body only needs to be placed at the press-fitting station on the supporting piece, the bottom of the piston body is pressed and positioned at the press-fitting station on the supporting piece through the first pressing block and the second pressing block, and the pressing head is pressed into the piston body through the alignment hole in the portal frame. And then the top of the piston body is supported in the vertical direction through the supporting and positioning clamp while the shaft shoulder of the piston body is clamped through the supporting and positioning clamp, and the piston body is effectively prevented from being pressed to deform or displace. At the moment, the piston ring is placed in the piston body, the piston head is fixed to the pressing head, the pressing head presses the piston head into the piston body under the guidance of the alignment hole in the portal frame, and therefore the piston ring abuts against and is fixed to the piston body. Therefore, when the piston press-fitting device provided by the embodiment is used for press-fitting the piston, the piston is convenient to assemble, time and labor are saved, the piston assembling efficiency is improved, the piston press-fitting consistency can be ensured, and the product yield is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of piston assembly equipment for air compressors, and particularly relates to a piston pressing device. Background Art

[0002] The piston used in a piston reciprocating air compressor generally includes a piston body, piston rings and a piston head. Currently, during the assembly process of the piston, it is usually necessary to place the piston rings on the piston body, and then manually press the piston head into the piston body to achieve the assembly of the piston head, piston rings and piston body. Since there is no special piston pressing device for auxiliary assembly and it completely relies on the assemblers to manually assemble, it not only takes time and effort, resulting in low assembly efficiency, but also the consistency of piston assembly is poor, reducing the product yield. Summary of the Utility Model

[0003] Based on the above problems existing in the prior art, one of the purposes of the embodiments of the present utility model is to provide a piston pressing device to solve the problems in the prior art that relying on manual assembly of the piston not only takes time and effort, resulting in low assembly efficiency, but also it is difficult to ensure the consistency of piston assembly.

[0004] To achieve the above purpose, the technical solution adopted by the present utility model is: to provide a piston pressing device, including:

[0005] A support member provided with a pressing station;

[0006] A pressing component for pressing and positioning the bottom of the piston body at the pressing station, and the pressing component is arranged on the support member;

[0007] A pressing head for pressing the piston head into the piston body equipped with piston rings to press and fix the piston rings on the piston body;

[0008] A support positioning fixture for clamping the shoulder of the piston body and supporting the piston body in the vertical direction to position the top of the piston body at the pressing station, and the support positioning fixture is arranged on the support member; and

[0009] A gantry fixedly arranged on the support member, and a positioning hole for guiding the pressing head to press into the piston body is arranged on the gantry.

[0010] Further, the support positioning fixture includes a first clamping seat, a second clamping seat, a first top block, a second top block, a first fixing member for locking the first clamping seat to the support member, and a second fixing member for locking the second clamping seat to the support member. The first clamping seat and the second clamping seat are respectively arranged on opposite sides of the press-fitting station in a horizontally slidable manner. The first top block is arranged on the first clamping seat, and the second top block is arranged on the second clamping seat.

[0011] Further, the first top block is arranged on the first clamping seat in a vertically slidable manner, and the second top block is arranged on the second clamping seat in a vertically slidable manner. The support positioning fixture further includes a first top pin for pushing the first top block to slide upward and a second top pin for pushing the second top block to slide upward. The first top pin is slidably inserted into the first clamping seat, and the second top pin is slidably inserted into the second clamping seat.

[0012] Further, a first T-shaped slider is provided on the first top block, and a first T-shaped chute is provided on the first clamping seat. The first T-shaped slider is slidably assembled in the first T-shaped chute.

[0013] Further, a second T-shaped slider is provided on the second top block, and a second T-shaped chute is provided on the second clamping seat. The second T-shaped slider is slidably assembled in the second T-shaped chute.

[0014] Further, the support positioning fixture further includes a first thrust block fixedly arranged on the first clamping seat, a second thrust block fixedly arranged on the second clamping seat, a first bolt for actuating the first top pin, and a second bolt for actuating the second top pin. A first threaded hole is provided on the first thrust block, and the first bolt is screwed into the first threaded hole. A second threaded hole is provided on the second thrust block, and the second bolt is screwed into the second threaded hole.

[0015] Further, the first top pin is arranged on the first clamping seat in a horizontally slidable manner, and the second top pin is arranged on the second clamping seat in a horizontally slidable manner. One side surface of the first top pin facing the first top block has a first inclined surface, and a second inclined surface that slidably contacts the first inclined surface is provided on the first top block. The slope directions of the first inclined surface and the second inclined surface are opposite. One side surface of the second top pin facing the second top block has a third inclined surface, and a fourth inclined surface that slidably contacts the third inclined surface is provided on the second top block. The slope directions of the third inclined surface and the fourth inclined surface are opposite.

[0016] Further, a first limit nut is provided at a position corresponding to the first threaded hole on the first thrust block, and the first limit nut is sleeved on the first bolt.

[0017] Further, a second limit nut is provided at a position corresponding to the second threaded hole on the second thrust block, and the second limit nut is sleeved on the second bolt.

[0018] Further, the pressing assembly includes a first pressing block, a second pressing block, a first screw for locking the first pressing block to the support member, and a second screw for locking the second pressing block to the support member. The first pressing block and the second pressing block are arranged in pairs on the support member. A first long strip hole for the first screw to pass through is provided on the first pressing block, and a second long strip hole for the second screw to pass through is provided on the second pressing block.

[0019] One or more of the above technical solutions in the embodiments of the present invention, compared with the prior art, have at least one of the following beneficial effects:

[0020] In the piston pressing device in the embodiment of the present invention, only the piston body needs to be placed at the pressing station on the support member, and the bottom of the piston body is pressed and positioned at the pressing station on the support member by using the first pressing block and the second pressing block. The pressing head is pressed into the piston body through the alignment hole on the gantry. Then, while clamping the shoulder of the piston body by using the support positioning fixture, the top of the piston body is supported in the vertical direction by the support positioning fixture, effectively avoiding the compression deformation or displacement of the piston body. At this time, the piston ring is placed into the piston body, the piston head is fixed to the pressing head, and the pressing head presses the piston head into the piston body under the guidance of the alignment hole on the gantry, so as to press and fix the piston ring on the piston body. Therefore, when using the piston pressing device provided in this embodiment to press the piston, it is convenient for the assembly of the piston, which not only saves time and effort and improves the efficiency of piston assembly, but also can ensure the consistency of piston pressing and improve the yield of products. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic three-dimensional structure diagram of the piston pressing device provided in the embodiment of the present invention;

[0023] Figure 2Assembly drawing of the support positioning fixture and the support provided by the embodiment of the present utility model;

[0024] Figure 3 is Figure 2 Schematic cross-sectional structure diagram of the support positioning fixture in

[0025] Figure 4 Schematic three-dimensional structure diagram of the piston pressing device provided by the embodiment of the present utility model in the pre-pressing calibration and ready-to-lock state;

[0026] Figure 5 Schematic three-dimensional structure diagram of the piston pressing device provided by the embodiment of the present utility model in the piston pressing state;

[0027] Figure 6 Exploded view of the piston pressing device provided by the embodiment of the present utility model;

[0028] Figure 7 Schematic three-dimensional structure diagram of the piston mentioned in the embodiment of the present utility model.

[0029] Among them, each reference numeral in the figure:

[0030] 1 - support; 11 - handle; 12 - pressing station; 13 - positioning groove;

[0031] 2 - pressing component; 21 - first pressing block; 22 - second pressing block; 23 - first screw; 24 - second screw; 25 - first long strip hole; 26 - second long strip hole;

[0032] 3 - support positioning fixture; 31 - first clamping seat; 311 - first T-shaped sliding groove; 32 - second clamping seat; 321 - second T-shaped sliding groove; 33 - first ejector pin; 331 - first inclined surface; 34 - second ejector pin; 341 - third inclined surface; 35 - first thrust block; 351 - first threaded hole; 36 - second thrust block; 361 - second threaded hole;

[0033] 37 - first bolt; 38 - second bolt; 39 - first top block; 391 - second inclined surface; 30 - second top block; 301 - fourth inclined surface;

[0034] 4 - gantry; 41 - alignment hole; 5 - pressing head;

[0035] 6 - piston; 61 - piston body; 611 - support part; 612 - shoulder; 62 - piston ring; 63 - piston head;

[0036] 7 - first limit nut; 8 - second limit nut;

[0037] 9 - piston calibration block; 10 - first T-shaped slider; 20 - second T-shaped slider. Detailed implementation mode

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0039] It should be noted that when an element is referred to as "connected to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0040] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more, unless otherwise clearly and specifically defined. "A plurality of" means one or more, unless otherwise clearly and specifically defined.

[0041] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model.

[0042] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0043] Reference to "an embodiment" or "embodiments" throughout the specification means that the specific features, structures, or characteristics described in connection with the embodiments are included in at least one embodiment of the present application. Thus, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, and not all references are to the same embodiment. Additionally, in one or more embodiments, the specific features, structures, or characteristics may be combined in any suitable manner.

[0044] Please refer to Figures 1 to 7 , and now a piston press-fitting device provided by an embodiment of the present utility model will be described. The piston press-fitting device provided by the embodiment of the present utility model is applicable to the alignment press-fitting of a piston body 61 and a piston head 63. The piston press-fitting device provided by the embodiment of the present utility model includes a support member 1, a pressing assembly 2, a support positioning fixture 3, a gantry 4, and a press head 5 for being installed on a press-fitting power mechanism in a matching manner. The press-fitting power mechanism may be, but is not limited to, a cylinder. The support member 1 is a support base plate. A handle 11 for moving or carrying the piston press-fitting device and a press-fitting station 12 are provided on the support member 1. A positioning groove 13 for accommodating and positioning the bottom disk-shaped support portion 611 of the piston body 61 is provided at a position corresponding to the press-fitting station 12 on the support member 1. The pressing assembly 2 is arranged on the support member 1 and is used for pressing and positioning the bottom of the piston body 61 at the press-fitting station 12. The support positioning fixture 3 is arranged on the support member 1 and is used for clamping the shoulder 612 of the piston body 61 and supporting the piston body 61 in the vertical direction to position the top of the piston body 61 at the press-fitting station 12. The press head 5 is used for pressing the piston head 63 into the piston body 61 equipped with a piston ring 62 to press and fix the piston ring 62 on the piston body 61. The gantry 4 is fixedly arranged on the support member 1, and an alignment hole for guiding the press head 5 to press into the piston body 61 is provided on the gantry 4.

[0045] Please further refer to Figure 4 , Figure 5 and Figure 6, the pressing assembly 2 includes a first pressing block 21, a second pressing block 62, a first screw 23 for locking the first pressing block 21 to the support member 1, and a second screw 26 for locking the second pressing block 62 to the support member 1. The first pressing block 21 and the second pressing block 62 are arranged in pairs on the support member 1. The first pressing block 21 is provided with a first long strip hole 25 through which the first screw 23 passes, and the second pressing block 62 is provided with a second long strip hole 26 through which the second screw 26 passes. Place the piston body 61 at the press-fitting station 12 on the support member 1. When the disc-shaped support portion 611 at the bottom of the piston body 61 is received and positioned in the positioning groove 13 on the support member 1, by adjusting the positions of the first pressing block 21 and the second pressing block 62 until the first pressing block 21 and the second pressing block 62 can press and fix the disc-shaped support portion 611 at the bottom of the piston body 61 in the positioning groove 13, fasten and lock the first pressing block 21 with the first screw 23, and at the same time fasten and lock the second pressing block 62 with the second screw 26, then the bottom of the piston body 61 can be pressed and positioned at the press-fitting station 12 on the support member 1 by the first pressing block 21 and the second pressing block 62.

[0046] Please further refer to Figure 1 , Figure 2 and Figure 3 , the support positioning fixture 3 includes a first clamping seat 31, a second clamping seat 32, a first top block 39, a second top block 30, a first fixing member for locking the first clamping seat 31 to the support member 1, and a second fixing member for locking the second clamping seat 32 to the support member 1. The first clamping seat 31 and the second clamping seat 32 are respectively arranged to slide horizontally on opposite sides of the press-fitting station 12. The first top block 39 is arranged on the first clamping seat 31, and the second top block 30 is arranged on the second clamping seat 32. After the first pressing block 21 and the second pressing block 62 press and position the bottom of the piston body 61 at the press-fitting station 12 on the support member 1, the press head 5 is pressed into the piston body 61 through the alignment hole 41 on the gantry 4 to pre-press and lock the piston body 61, so that the piston body 61 maintains the consistency of the press-fitting position during press-fitting. Then, slide the first clamping seat 31 and the second clamping seat 32 respectively, so that the first clamping seat 31 and the second clamping seat 32 approach each other until the first top block 39 and the second top block 30 clamp the shoulder 612 of the piston body 61. Fasten and lock the first clamping seat 31 with the first fixing member, and at the same time fasten and lock the second clamping seat 32 with the second fixing member. The first top block 39 and the second top block can support the piston body 61 in the vertical direction to position the top of the piston body 61 at the press-fitting station 12, preventing the top of the piston body 61 from generating downward displacement or deviation during press-fitting, which affects the consistency of piston assembly. It should be noted that the first fixing member and / or the second fixing member can be but are not limited to screws.

[0047] Please further refer to Figure 2 、 Figure 3 and Figure 6 , the first top block 39 is slidably arranged on the first clamping seat 31 in the vertical direction, the second top block 30 is slidably arranged on the second clamping seat 32 in the vertical direction, the support positioning fixture 3 further includes a first ejector pin 33 for pushing the first top block 39 to slide upward and a second ejector pin 34 for pushing the second top block 30 to slide upward. The first ejector pin 33 is slidably inserted into the first clamping seat 31, and the second ejector pin 34 is slidably inserted into the second clamping seat 32. The first top block 39 can be pushed to slide upward by the first ejector pin 33, and at the same time, the second top block 30 can be pushed to slide upward by the second ejector pin 34. The first top block 39 and the second top block 30 clamp the shoulder 612 of the piston body 61, and the first top block 39 and the second top block 30 support the piston body 61 upward in the vertical direction to prevent the top of the piston body 61 from generating downward displacement or deviation during the press-fitting process, which affects the consistency of piston assembly.

[0048] Please further refer to Figure 1 、 Figure 2 and Figure 6 , the first top block 39 is provided with a first T-shaped slider 10, the first clamping seat 31 is provided with a first T-shaped chute 311, and the first T-shaped slider 10 is slidably assembled in the first T-shaped chute 311. On the one hand, it enhances the stability of the first ejector pin 33 pushing the first top block 39 to slide upward, and on the other hand, it improves the stability of the first top block 39 supporting the piston body 61 upward in the vertical direction.

[0049] Please further refer to Figure 1 、 Figure 2 and Figure 6 , the second top block 30 is provided with a second T-shaped slider 20, the second clamping seat 32 is provided with a second T-shaped chute 321, and the second T-shaped slider 20 is slidably assembled in the second T-shaped chute 321. On the one hand, it enhances the stability of the second ejector pin 34 pushing the second top block 30 to slide upward, and on the other hand, it improves the stability of the second top block 30 supporting the piston body 61 upward in the vertical direction.

[0050] Please further refer to Figure 1 、 Figure 2 and Figure 6, the support positioning fixture 3 further includes a first thrust block 35 fixedly arranged on the first clamping seat 31, a second thrust block 36 fixedly arranged on the second clamping seat 32, a first bolt 37 for actuating the first ejector pin 33, and a second bolt 38 for actuating the second ejector pin 34. The first thrust block 35 is provided with a first threaded hole 351, and the first bolt 37 is screwed into the first threaded hole 351. The second thrust block 36 is provided with a second threaded hole 361, and the second bolt 38 is screwed into the second threaded hole 361. By screwing the first bolt 37 and the second bolt 38, the first bolt 37 actuates the first ejector pin 33, and the first ejector pin 33 further pushes the first top block 39 to slide upward. At the same time, the second bolt 38 actuates the second ejector pin 34, and the second ejector pin 34 further pushes the second top block 30 to slide upward. The first top block 39 and the second top block 30 clamp the shoulder 612 of the piston body 61, supporting the piston body 61 upward in the vertical direction to prevent the top of the piston body 61 from generating downward displacement or offset during the press-fitting process, which affects the consistency of piston assembly.

[0051] Please further refer to Figure 1 , Figure 2 and Figure 6 , the first ejector pin 33 is slidably arranged on the first clamping seat 31 in the horizontal direction, the second ejector pin 34 is slidably arranged on the second clamping seat 32 in the horizontal direction. One side surface of the first ejector pin 33 facing the first top block 39 has a first inclined surface 331, and the first top block 39 is provided with a second inclined surface 391 that slidably contacts the first inclined surface 391, and the slope directions of the first inclined surface 391 and the second inclined surface 391 are opposite. One side surface of the second ejector pin 34 facing the second top block 30 has a third inclined surface 341, and the second top block 30 is provided with a fourth inclined surface 301 that slidably contacts the third inclined surface 341, and the slope directions of the third inclined surface 341 and the fourth inclined surface 301 are opposite. In this embodiment, under the sliding cooperation of the first inclined surface 391 and the second inclined surface 391, by pushing the first ejector pin 33 to slide in the horizontal direction through the first bolt 37, the up-and-down movement of the first top block 39 in the vertical direction can be achieved. Similarly, under the sliding cooperation of the third inclined surface 341 and the fourth inclined surface 301, by pushing the second ejector pin 34 to slide in the horizontal direction through the second bolt 38, the up-and-down movement of the second top block 30 in the vertical direction can be achieved, so as to achieve the effect of stably supporting the top of the plug body, preventing the top of the piston body 61 from generating downward displacement or offset during the press-fitting process, which affects the consistency of piston assembly.

[0052] Please further refer to Figure 2 , Figure 3 and Figure 6, a first limit nut 7 is provided at a position corresponding to the first threaded hole 351 on the first thrust block 35. The first limit nut 7 is sleeved on the first bolt 37. A second limit nut 8 is provided at a position corresponding to the second threaded hole 361 on the second thrust block 36. The second limit nut 8 is sleeved on the second bolt 38.

[0053] Please further refer to Figure 4 , the piston press-fitting device further includes a piston calibration block 9 for calibrating the piston. The piston body 61 positioned on the support member 1 is calibrated by the piston calibration block 9, which is beneficial to improving the consistency of piston press-fitting.

[0054] When the piston pressing device provided by the embodiment of the present utility model is in use, only the piston body 61 needs to be placed at the pressing station 12 on the support member 1. When the disc-shaped support portion 611 at the bottom of the piston body 61 is received and positioned in the positioning groove 13 on the support member 1, by adjusting the positions of the first pressing block 21 and the second pressing block 62 until the first pressing block 21 and the second pressing block 62 can press and fix the disc-shaped support portion 611 at the bottom of the piston body 61 in the positioning groove 13, the first pressing block 21 is fastened and locked by the first screw 23, and at the same time, the second pressing block 62 is fastened and locked by the second screw 26, then the bottom of the piston body 61 can be pressed and positioned at the pressing station 12 on the support member 1 by the first pressing block 21 and the second pressing block 62. Then, the first clamping seat 31 and the second clamping seat 32 are respectively slid, so that the first clamping seat 31 and the second clamping seat 32 approach each other until the first top block 39 and the second top block 30 clamp the shoulder 612 of the piston body 61. The first clamping seat 31 is fastened and locked by the first fixing member, and at the same time, the second clamping seat 32 is fastened and locked by the second fixing member. The first top block 39 and the second top block can support the piston body 61 in the vertical direction. During the process that the first top block 39 and the second top block support the piston body 61 in the vertical direction, the first bolt 37 and the second bolt 38 can be screwed. The first bolt 37 actuates the first top pin 33, and the first top pin 33 further pushes the first top block 39 to slide upward. At the same time, the second bolt 38 actuates the second top pin 34, and the second top pin 34 further pushes the second top block 30 to slide upward, realizing fine adjustment of the positions of the first top block 39 and the second top block 30, so that the first top block 39 and the second top block stably support the piston body 61 upward in the vertical direction, preventing the top of the piston body 61 from generating downward displacement or deviation during the pressing process and affecting the consistency of piston assembly. Finally, the piston ring 62 is placed into the piston body 61, and then the piston head 63 is sucked by the magnetic pressing head 5. Under the guidance of the alignment hole 41 on the gantry 4, the pressing head 5 presses the piston head 63 into the piston body 61 to press and fix the piston ring 62 on the piston body 61. In this way, the operation of pressing the piston is simple and convenient, which not only saves time and effort and improves the efficiency of piston assembly, but also can ensure the consistency of piston pressing and improve the yield of products.

[0055] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A piston press-fitting device, characterized in that, Comprising: A support member provided with a press-fitting station; A pressing component for pressing and positioning the bottom of the piston body at the press-fitting station, the pressing component being arranged on the support member; A punch for pressing the piston head into the piston body equipped with piston rings to press and fix the piston rings on the piston body; A support positioning fixture for clamping the shoulder of the piston body and supporting the piston body in the vertical direction to position the top of the piston body at the press-fitting station, the support positioning fixture being arranged on the support member; And A gantry fixedly arranged on the support member, and a positioning hole for guiding the punch to press into the piston body is provided on the gantry.

2. The piston press-fitting device according to claim 1, wherein The support positioning fixture includes a first clamping seat, a second clamping seat, a first top block, a second top block, a first fixing member for locking the first clamping seat on the support member, and a second fixing member for locking the second clamping seat on the support member. The first clamping seat and the second clamping seat are respectively arranged on opposite sides of the press-fitting station in a horizontally sliding manner. The first top block is arranged on the first clamping seat, and the second top block is arranged on the second clamping seat.

3. The piston press-fitting device according to claim 2, characterized in that, The first top block is arranged on the first clamping seat in a vertically slidable manner, and the second top block is arranged on the second clamping seat in a vertically slidable manner. The support positioning fixture further includes a first top pin for pushing the first top block to slide upward and a second top pin for pushing the second top block to slide upward. The first top pin is slidably inserted into the first clamping seat, and the second top pin is slidably inserted into the second clamping seat.

4. The piston press-fitting device according to claim 3, wherein, A first T-shaped slider is provided on the first top block, and a first T-shaped chute is provided on the first clamping seat. The first T-shaped slider is slidably assembled in the first T-shaped chute.

5. The piston press-fitting device according to claim 3, characterized in that, A second T-shaped slider is provided on the second top block, and a second T-shaped chute is provided on the second clamping seat. The second T-shaped slider is slidably assembled in the second T-shaped chute.

6. The piston press-fitting device according to claim 3, characterized in that, The support positioning fixture further includes a first thrust block fixedly arranged on the first clamping seat, a second thrust block fixedly arranged on the second clamping seat, a first bolt for actuating the first top pin, and a second bolt for actuating the second top pin. A first threaded hole is provided on the first thrust block, and the first bolt is screwed into the first threaded hole. A second threaded hole is provided on the second thrust block, and the second bolt is screwed into the second threaded hole.

7. The piston press-fitting device according to claim 6, characterized in that, The first top pin is arranged on the first clamping seat in a horizontally slidable manner, and the second top pin is arranged on the second clamping seat in a horizontally slidable manner. One side surface of the first top pin facing the first top block has a first inclined surface, and a second inclined surface in sliding contact with the first inclined surface is provided on the first top block, and the slope directions of the first inclined surface and the second inclined surface are opposite. One side surface of the second top pin facing the second top block has a third inclined surface, and a fourth inclined surface in sliding contact with the third inclined surface is provided on the second top block, and the slope directions of the third inclined surface and the fourth inclined surface are opposite.

8. The piston press-fitting device according to claim 6, characterized in that, A first limit nut is provided at a position corresponding to the first threaded hole on the first thrust block, and the first limit nut is sleeved on the first bolt.

9. The piston press-fitting device according to claim 6, wherein, A second limit nut is provided at a position corresponding to the second threaded hole on the second thrust block, and the second limit nut is sleeved on the second bolt.

10. The piston press-fitting device according to any one of claims 1 to 9, characterized in that The pressing assembly includes a first pressing block, a second pressing block, a first screw for locking the first pressing block to the support member, and a second screw for locking the second pressing block to the support member. The first pressing block and the second pressing block are arranged in pairs on the support member. A first long strip hole for the first screw to pass through is provided on the first pressing block, and a second long strip hole for the second screw to pass through is provided on the second pressing block.

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