A device for assisting in the disassembly of piston rings

Abstract

A kind of auxiliary device for disassembling piston ring belongs to piston ring installation tool technical field, including the first handle and second handle of first connecting shaft rotation connection, first handle, second handle are respectively fixedly connected with one strutting arm by second connecting shaft, first handle and second handle are connected with two strutting arms by slide bar;Slide bar includes the vertical horizontal bar portion and vertical bar portion, the head of vertical bar portion is fixedly connected with horizontal bar portion, horizontal bar portion is slidably connected with two second connecting shafts, the middle part of vertical bar portion is slidably connected with first connecting shaft;Two strutting arms are slidably connected with the tail of vertical bar portion by one connecting rod.Horizontal bar portion and the sliding connection of second connecting shaft, can make the action of handle synchronous transmission to two strutting arms, reduce the intensity difference of two sides strutting arms;The sliding connection of vertical bar portion and first connecting shaft and connecting rod, further guarantee the stability of device in the process of movement, so that piston ring can realize symmetrical opening and closing.

Description

Technical Field

[0001] This utility model relates to the field of piston ring installation tools, and in particular to an auxiliary device for piston ring disassembly and assembly. Background Technology

[0002] During piston installation, before the piston rings are installed into the piston, they need to be opened to a specified degree before they can be smoothly installed into the piston ring groove. However, piston rings have a certain degree of hardness and elasticity. Manual assembly is not only difficult to install, but may also damage the piston rings. Furthermore, it is time-consuming and inefficient.

[0003] To improve the efficiency of piston ring installation, auxiliary tools for opening piston ring openings have been developed. These auxiliary devices typically have two handles, one fixed and the other movable. Each handle has a clamping arm fixedly mounted on it. The clamping arm abuts against the opening of the piston ring, and the movable handle is moved to open the opening of the piston ring, thus facilitating piston ring installation.

[0004] Existing piston ring installation aids have a force difference when the two clamping arms open, resulting in an asymmetrical opening and closing of the piston ring. This causes one side of the piston ring to experience greater force than the other, making it prone to twisting, deformation, or breakage due to excessive localized stress. Furthermore, the force difference between the two clamping arms leads to instability in the auxiliary device's operation, causing the piston ring opening size to easily change. During installation, incompatibility in opening size can easily cause the piston ring to scratch the piston surface. Utility Model Content

[0005] To address the technical problem in the existing piston ring installation auxiliary device mentioned above, where the two clamping arms have a force difference when they open, resulting in an asymmetrical opening and closing of the piston ring and instability during use, which easily causes damage to the piston ring and piston surface, this utility model provides an auxiliary device for piston ring assembly and disassembly.

[0006] The technical solution of this utility model is as follows:

[0007] This utility model provides an auxiliary device for disassembling and assembling piston rings, comprising: a first handle and a second handle rotatably connected by a first connecting shaft; the first handle and the second handle are respectively fixedly connected to a spreading arm via the second connecting shaft; the first handle and the second handle are connected to the two spreading arms via a sliding rod; the sliding rod includes a horizontal rod portion and a vertical rod portion perpendicular to each other; the head of the vertical rod portion is fixedly connected to the horizontal rod portion; the horizontal rod portion is slidably connected to the two second connecting shafts; the middle portion of the vertical rod portion is slidably connected to the first connecting shaft; the two spreading arms are respectively slidably connected to the tail portion of the vertical rod portion via a connecting rod; the slidable connection of the horizontal rod portion to the second connecting shaft enables the action of the handle to be synchronously transmitted to the two spreading arms, reducing the force difference between the two spreading arms; the slidable connection of the vertical rod portion to the first connecting shaft and the connecting rod further ensures the stability of the device during movement, enabling the piston rings to open and close symmetrically.

[0008] Preferably, one end of the connecting rod is rotatably connected to the corresponding spreading arm via a third connecting shaft, and the ends of the two connecting rods away from the spreading arm are hinged together via a fourth connecting shaft. The fourth connecting shaft is slidably connected to the tail of the vertical rod, which enhances the stability and synchronization of the device. When the spreading arm opens, the connecting rod further balances the force on both sides of the spreading arm through the cooperation of rotation and sliding, avoiding asymmetrical opening and closing. At the same time, it can also make the whole device more stable during movement and reduce the impact on the piston ring and piston surface.

[0009] Preferably, a first sliding groove is formed in the middle of the vertical rod along its length, and two second sliding grooves are formed at intervals along the length of the horizontal rod. The two second sliding grooves are symmetrically distributed on both sides of the first sliding groove. The first sliding groove is slidably connected to the first connecting shaft, and the second connecting shaft is slidably connected to the corresponding second sliding groove, providing precise motion guidance. The first and second sliding grooves cooperate with the corresponding connecting shafts to ensure that the relative movement between the handle, the sliding rod, and the spreading arm follows a predetermined trajectory, thereby ensuring the synchronization and symmetry of the spreading arms on both sides, effectively solving the problem of asymmetrical opening and closing caused by force difference, and also improving the stability of the device.

[0010] Preferably, the tail of the vertical rod is provided with a third sliding groove, and the fourth connecting shaft is slidably connected to the third sliding groove, which further improves the motion constraint of the linkage mechanism, making the connecting rod more stable during movement, better balancing the force on the two sides of the spreading arms, ensuring the symmetrical opening and closing of the piston ring opening, and also enhancing the overall stability of the device, reducing the possibility of damage to the piston ring and piston surface caused by shaking.

[0011] Preferably, the spreading arm includes an arc-shaped body and a protrusion located on the outer arc surface of the arc-shaped body. The inner arc surface of the arc-shaped body can better conform to the shape of the piston ring, making the piston ring more evenly stressed during the spreading process, reducing local stress concentration, and lowering the risk of piston ring deformation. The arc-shaped body and the protrusion are respectively provided with a fifth connecting hole and a sixth connecting hole. The fifth connecting hole is connected to the second connecting shaft, and the sixth connecting hole is connected to the third connecting shaft. The L-shaped arrangement of the connecting holes makes the connection between the spreading arm and other components more stable, ensuring the effective transmission of force and helping to achieve symmetrical opening and closing of the piston ring and stable operation of the device.

[0012] Preferably, the two connecting rods are of the same length and arranged in a V-shape, which makes the linkage mechanism have good symmetry during movement. The symmetrical structure can ensure that the forces on both sides of the opening arm are equal during opening and closing, thereby realizing the symmetrical opening and closing of the piston ring opening and avoiding the force difference and asymmetrical opening and closing problems caused by the difference in the connecting rod structure.

[0013] Preferably, a first locking part, a second locking part, and a third locking part are fixedly fixedly arranged at intervals on the inner arc surface of the spreading arm. The first locking part is close to the second connecting shaft and a stop is fixedly provided on the first locking part. The stop is used to abut against the piston ring opening. The arrangement of multiple locking parts increases the contact points between the spreading arm and the piston ring, so that the piston ring can be more stably fixed on the spreading arm during the spreading process. The stop abuts against the piston ring opening, which can accurately control the spreading position and degree of the piston ring, avoid the piston ring from sliding or shifting during the spreading process, thereby ensuring the symmetrical opening and closing of the piston ring, and also reducing damage to the piston ring and piston surface.

[0014] Preferably, the first and second locking parts are both L-shaped structures, and the third locking part is a U-shaped structure. The stop block is located on the side of the first locking part away from the second locking part. The L-shaped and U-shaped locking parts can limit the piston ring from multiple directions, further enhancing the stability of the piston ring during the opening process. The position setting of the stop block can accurately position the piston ring opening, ensuring the symmetrical opening and closing of the piston ring opening and reducing damage caused by inaccurate positioning.

[0015] Preferably, a spring is connected between the two spreading arms. During the process of spreading the piston rings, the spring can absorb some of the impact force and reduce damage to the piston rings and piston surface. When the operator releases the handle, the spring can automatically reset the spreading arms for easy use next time.

[0016] Preferably, both the first handle and the second handle include a grip portion, and the grip portions of the first handle and the second handle are symmetrically distributed on the left and right sides of the first connecting shaft. When the operator operates the handle, it is more convenient to apply uniform force, which helps to reduce the difference in force between the two sides of the opening arm caused by uneven force applied by the operator, thereby ensuring the symmetrical opening and closing of the piston ring opening.

[0017] As can be seen from the above technical solutions, the advantages of this utility model are:

[0018] 1. A sliding rod connects the handle and the spreading arm. The spreading arm is also connected to the sliding rod via a connecting rod. The sliding connection between the horizontal part of the sliding rod and the second connecting shaft allows the handle's movement to be transmitted synchronously to the two spreading arms, reducing the force difference between the two spreading arms. The sliding connection between the vertical part and the first connecting shaft and the connecting rod further ensures the stability of the device during movement, enabling the piston rings to open and close symmetrically, improving the stability during use, and protecting the piston rings.

[0019] 2. The first and second slide grooves respectively cooperate with the corresponding connecting shafts to ensure that the relative movement between the handle, slide rod and spreading arm is carried out according to the predetermined trajectory, thereby ensuring the synchronization and symmetry of the two spreading arms, effectively solving the problem of asymmetrical opening and closing caused by force difference, and also improving the stability of the device. The setting of the third slide groove further improves the motion constraint on the linkage mechanism, making the connecting rod more stable during the movement, better balancing the force on the two spreading arms, ensuring the symmetrical opening and closing of the piston ring opening, and also enhancing the overall stability of the device, reducing the possibility of damage to the piston ring and piston surface caused by shaking.

[0020] 3. The two connecting rods are of the same length and arranged in a V-shape, which gives the linkage mechanism good symmetry during movement. The symmetrical structure ensures that the forces on both sides of the opening arm are equal during opening and closing, thereby achieving symmetrical opening and closing of the piston ring opening and avoiding the force difference and asymmetrical opening and closing problems caused by the difference in the connecting rod structure. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the auxiliary device for piston ring assembly and disassembly according to one or more embodiments of the present invention.

[0023] Figure 2This is a top view of the auxiliary device for piston ring assembly and disassembly according to one or more embodiments of the present invention.

[0024] Figure 3 This is a bottom view of the auxiliary device for piston ring assembly and disassembly according to one or more embodiments of the present invention.

[0025] Figure 4 This is a schematic diagram of the structure of the first handle according to one or more embodiments of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the second handle according to one or more embodiments of the present invention;

[0027] Figure 6 This is a schematic diagram of the slide bar according to one or more embodiments of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of the spreading arm according to one or more embodiments of the present invention;

[0029] The components represented by the various reference numerals in the diagram are:

[0030] 1. Spread arm; 2. Connecting pin; 3. Washer; 4. First connecting shaft; 5. Connecting rod; 6. First handle; 7. Second connecting shaft; 8. Second handle; 9. Slide rod; 91. Horizontal bar; 92. Vertical bar; 10. Third connecting shaft; 11. Fourth connecting shaft; 12. Spring; 13. First slide groove; 14. Second slide groove; 15. Third slide groove; 16. First locking part; 17. Second locking part; 18. Third locking part; 19. Stop; 20. First connecting hole; 21. Second connecting hole; 22. Third connecting hole; 23. Fourth connecting hole; 24. Fifth connecting hole; 25. Sixth connecting hole; 26. Hand grip; 27. Arc-shaped body; 28. Protrusion. Detailed Implementation

[0031] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0032] Example 1

[0033] In a typical embodiment of this utility model, such as Figures 1-3As shown, an auxiliary device for piston ring assembly and disassembly is proposed, comprising: a spreading arm 1, a connecting rod 5, a first handle 6, a second handle 8, and a sliding rod 9. The first handle 6 and the second handle 8 are rotatably connected via a first connecting shaft 4, and the grip portions 26 of the first handle 6 and the second handle 8 are symmetrically distributed on the left and right sides of the first connecting shaft 4. A spreading arm 1 is fixedly connected to the end of the first handle 6 and the second handle 8, and the spreading arm 1 is fixedly connected to the corresponding handle via a second connecting shaft 7. The two spreading arms 1 can follow the movement of the corresponding handle to spread open the piston ring opening. The first handle 6 and the second handle 8 are also connected to the two piston rings via the sliding rod 9. The two opening arms 1 are connected by a sliding rod 9, which has a T-shaped structure. The sliding rod 9 includes a horizontal rod 91 and a vertical rod 92 that are perpendicular to each other. The head of the vertical rod 92 is fixedly connected to the horizontal rod 91. The horizontal rod 91 is slidably connected to two second connecting shafts 7, and the middle part of the vertical rod 92 is slidably connected to the first connecting shaft 4. The two opening arms 1 are also slidably connected to the tail of the vertical rod 92 by a connecting rod 5. When operating the first handle 6 and the second handle 8, the T-shaped sliding rod 9 can be used to drive the two opening arms 1 to open and close symmetrically. At the same time, the two connecting rods 5 assist in pulling and restricting the opening arms 1, further improving the symmetrical opening and closing ability of the two opening arms 1.

[0034] like Figure 4 As shown, the first handle 6 includes a first connecting hole 20 and a second connecting hole 21. The first connecting hole 20 is located in the middle area of ​​the first handle 6, and the second connecting hole 21 is located at the end of the first handle 6 away from the hand grip 26. The first connecting hole 20 is used for the installation of the first connecting shaft 4 to realize the rotatable connection between the first handle 6 and the second handle 8; the second connecting hole 21 is used for the installation of the second connecting shaft 7 to realize the fixed connection between the first handle 6 and the corresponding spreading arm 1.

[0035] like Figure 5 As shown, the second handle 8 includes a third connecting hole 22 and a fourth connecting hole 23. The third connecting hole 22 is located in the middle area of ​​the second handle 8, and the fourth connecting hole 23 is located at the end of the second handle 8 away from the hand grip 26. The third connecting hole 22 is used for the installation of the first connecting shaft 4 to realize the rotatable connection between the second handle 8 and the first handle 6; the fourth connecting hole is used for the installation of the second connecting shaft 7 to realize the fixed connection between the second handle 8 and the corresponding spreading arm 1.

[0036] The central axis of slide rod 9 and the central axis of the auxiliary device as a whole are located in the same plane, such as... Figure 6As shown, the slide bar 9 includes a horizontal bar portion 91 and a vertical bar portion 92. The horizontal bar portion 91 is fixedly installed at the head of the vertical bar portion 92. The axis of the horizontal bar portion 91 is perpendicular to that of the vertical bar portion 92. A first sliding groove 13 is formed in the middle of the vertical bar portion 92 along its length direction. Two second sliding grooves 14 are formed at intervals along the length direction on the horizontal bar portion 91. The two second sliding grooves 14 are symmetrically distributed on both sides of the center of the horizontal bar portion 91, and the axes of the two second sliding grooves 14 coincide. It can also be understood that the two second sliding grooves 14 are symmetrically distributed on both sides of the first sliding groove 13. The first sliding groove 13 is connected to the first connecting shaft 4. The sliding connection is achieved by sliding the two second connecting shafts 7 to a corresponding second sliding groove 14. When the first handle 6 and the second handle 8 are activated, the movement of the slide rod 9 can be guided by the cooperation of the first connecting shaft 4 and the first sliding groove 13. At the same time, the cooperation of the second connecting shaft 7 and the second sliding groove 14 enables the slide rod 9 to drive the two spreading arms 1 to open and close symmetrically. The vertical rod part 92 is also provided with a third sliding groove 15, which extends along the length of the vertical rod part 92 and is located at the tail of the vertical rod part 92 for sliding connection with the connecting rod 5.

[0037] The first slide groove 13 and the second slide groove 14 respectively cooperate with the corresponding connecting shafts to ensure that the relative movement between the handle, slide rod 9 and the spreading arm 1 is carried out according to the predetermined trajectory, thereby ensuring the synchronization and symmetry of the two spreading arms 1, effectively solving the problem of asymmetrical opening and closing caused by force difference, and also improving the stability of the device. The setting of the third slide groove 15 further improves the motion constraint of the linkage mechanism, making the connecting rod 5 more stable during the movement, better balancing the force on the two spreading arms 1, ensuring the symmetrical opening and closing of the piston ring opening, and also enhancing the overall stability of the device, reducing the possibility of damage to the piston ring and piston surface caused by shaking.

[0038] In this embodiment, the first slide groove 13, the second slide groove 14 and the third slide groove 15 are all oblong hole structures (i.e., waist hole structures).

[0039] like Figure 7 As shown, the spreading arm 1 includes an arc-shaped body 27 and a protrusion 28. The protrusion 28 is fixedly disposed on the outer arc surface of the arc-shaped body 27. The spreading arm 1 is provided with a fifth connecting hole 24 and a sixth connecting hole 25. The fifth connecting hole 24 is disposed on the arc-shaped body 27, and the sixth connecting hole 25 is disposed on the protrusion 28. The fifth connecting hole 24 and the sixth connecting hole 25 are arranged in an L-shape. The fifth connecting hole 24 is used for the installation of the second connecting shaft 7 to realize the fixed connection between the spreading arm 1 and the corresponding handle. The sixth connecting hole 25 is located on the side of the fifth connecting hole 24 near the hand grip 26. The sixth connecting hole 25 is used for the installation of the third connecting shaft 10. Specifically, the sixth connecting hole 25 is rotatably connected to one end of the connecting rod 5 through the third connecting shaft 10, and the other end of the connecting rod 5 is slidably connected to the vertical rod part 92.

[0040] In this embodiment, the grip 26 adopts a rolled edge process to increase the fit of the palm and improve the comfort of operating the first handle 6 and the second handle 8.

[0041] like Figure 1 As shown, there are two connecting rods 5 of the same length, arranged in a V-shape. The ends of the two connecting rods 5 that are slidably connected to the vertical rod 92 are rotatably connected by a fourth connecting shaft 11, and are slidably connected to the third sliding groove 15 at the tail of the vertical rod 92 through the fourth connecting shaft 11. This makes the linkage mechanism composed of the two connecting rods 5 have good symmetry during the movement. The symmetrical structure can ensure that the forces on both sides of the opening arm 1 are equal during the opening and closing process, thereby realizing the symmetrical opening and closing of the piston ring opening and avoiding the force difference and asymmetrical opening and closing problems caused by the structural differences of the connecting rods 5.

[0042] like Figure 7 As shown, a first locking part 16, a second locking part 17, and a third locking part 18 are sequentially and fixedly provided on the inner arc surface of the spreading arm 1. The first locking part 16 is close to the fifth connecting hole 24. The first locking part 16 and the second locking part 17 are L-shaped structures for fitting and locking with the outer wall of the piston ring. A stop block 19 is also fixed on the first locking part 16. The stop block 19 is located on the side of the first locking part 16 away from the second locking part 17 for abutting against the opening of the piston ring. Thus, when the spreading arm 1 performs the spreading action, the stop block 19 pulls the opening end of the piston ring. The third locking part 18 is U-shaped for fitting and locking with the outer wall of the piston ring and for support and limitation, thereby improving the stability of the piston ring during the spreading process.

[0043] In this embodiment, there is one second latching part 17; in other embodiments, there may be two or other numbers of second latching parts 17. The number of second latching parts 17 can be determined according to the actual design requirements, and no further restrictions are imposed here.

[0044] To improve the overall service life of the device, washers 3 are provided between the first connecting shaft 3 and the first handle 6 and the second handle 7, between the third connecting shaft 10 and the spreading arm 1, and between the fourth connecting shaft 10 and the connecting rod 5, so as to reduce the wear between the connecting shaft and the corresponding parts.

[0045] like Figure 1 As shown, the two spreading arms 1 are also connected by a spring 12. Each end of the spring 12 is connected to a connecting pin 2, so that it can be detachably connected to the corresponding spreading arm 1 through the connecting pin 2. Thus, when the first handle 6 and the second handle 8 are released, the two spreading arms 1 that are far apart from each other can achieve self-reset by the action of the spring 12.

[0046] The specific working principle is as follows:

[0047] The piston ring is installed within the circular space enclosed by the two expansion arms 1. The inner diameter of the expansion arm 1 is the same as the outer diameter of the piston ring to ensure reliable positioning without wobbling. This allows the outer wall of the piston ring to engage with the adjacent first locking part 16, second locking part 17, and third locking part 18, and to abut the piston ring opening end of the stop block 19 on the two expansion arms 1. By gripping and applying force to the first handle 6 and the second handle 8, the first handle 6 and the second handle 8 drive the corresponding expansion arms 1 away from each other, increasing the angle between the two connecting rods 5. At this time, the first connecting shaft 4 moves along the first slide groove 13 toward the direction closer to the second slide groove 14, the two second connecting shafts 7 move along the corresponding second slide grooves 14 toward the direction away from each other, and the fourth connecting shaft 11 moves along the third slide groove 15 toward the direction closer to the first slide groove 13. Through the movement guidance and positioning effect of the slide rod 9 and the connecting rod 5, the movement trajectory of the expansion arms 1 is restricted, ensuring the symmetrical opening and closing of the two expansion arms 1. After releasing the first handle 6 and the second handle 8, the spring 12 pulls the two expansion arms 1 to automatically reset.

[0048] 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. An auxiliary device for piston ring assembly and disassembly, comprising: The first handle (6) and the second handle (8) are rotatably connected by the first connecting shaft (4), characterized in that the first handle (6) and the second handle (8) are respectively fixedly connected to a support arm (1) through the second connecting shaft (7), and the first handle (6) and the second handle (8) are connected to the two support arms (1) through the slide rod (9); The slide bar (9) includes a horizontal bar (91) and a vertical bar (92) that are perpendicular to each other. The head of the vertical bar (92) is fixedly connected to the horizontal bar (91). The horizontal bar (91) is slidably connected to two second connecting shafts (7). The middle part of the vertical bar (92) is slidably connected to the first connecting shaft (4). The two spreading arms (1) are slidably connected to the tail of the vertical bar (92) through a connecting rod (5).

2. The auxiliary device for piston ring assembly and disassembly according to claim 1, characterized in that, One end of the connecting rod (5) is rotatably connected to the corresponding support arm (1) via the third connecting shaft (10). The ends of the two connecting rods (5) away from the support arm (1) are hinged together via the fourth connecting shaft (11). The fourth connecting shaft (11) is slidably connected to the tail of the vertical rod (92).

3. The auxiliary device for piston ring assembly and disassembly according to claim 2, characterized in that, The vertical rod (92) has a first groove (13) in the middle along its length direction, and the horizontal rod (91) has two second grooves (14) spaced apart along its length direction. The two second grooves (14) are symmetrically distributed on both sides of the first groove (13). The first groove (13) is slidably connected to the first connecting shaft (4), and the second connecting shaft (7) is slidably connected to the corresponding second groove (14).

4. The auxiliary device for piston ring assembly and disassembly according to claim 2, characterized in that, The tail of the vertical rod (92) is provided with a third sliding groove (15), and the fourth connecting shaft (11) is slidably connected to the third sliding groove (15).

5. The auxiliary device for piston ring assembly and disassembly according to claim 2, characterized in that, The spreading arm (1) includes an arc-shaped body (27) and a protrusion (28) located on the outer arc surface of the arc-shaped body (27). The arc-shaped body (27) and the protrusion (28) are respectively provided with a fifth connecting hole (24) and a sixth connecting hole (25). The fifth connecting hole (24) is connected to the second connecting shaft (7), and the sixth connecting hole (25) is connected to the third connecting shaft (10).

6. The auxiliary device for piston ring assembly and disassembly according to claim 1, characterized in that, The two connecting rods (5) are of the same length and are arranged in a V-shape.

7. The auxiliary device for piston ring assembly and disassembly according to claim 5, characterized in that, The inner arc surface of the spreading arm (1) is provided with a first snap-fit ​​part (16), a second snap-fit ​​part (17) and a third snap-fit ​​part (18) fixedly at intervals. The first snap-fit ​​part (16) is close to the second connecting shaft (7). A stop block (19) is fixedly provided on the first snap-fit ​​part (16). The stop block (19) is used to abut against the piston ring opening.

8. The auxiliary device for piston ring assembly and disassembly according to claim 7, characterized in that, The first latching part (16) and the second latching part (17) are both L-shaped structures, the third latching part (18) is a U-shaped structure, and the stop block (19) is located on the side of the first latching part (16) away from the second latching part (17).

9. The auxiliary device for piston ring assembly and disassembly according to claim 1, characterized in that, A spring (12) is connected between the two spreading arms (1).

10. The auxiliary device for piston ring assembly and disassembly according to claim 1, characterized in that, Both the first handle (6) and the second handle (8) include a grip (26), and the grips (26) of the first handle (6) and the second handle (8) are symmetrically distributed on the left and right sides of the first connecting shaft (4).

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