A pre-dilation and self-returning O-ring mounting device

Abstract

This invention relates to an O-ring installation device with pre-expansion and self-returning, comprising: a base plate, a moving assembly, a telescopic assembly, and a driving assembly; the moving assembly includes a reference block connected to the telescopic assembly and used for placing the O-ring; the telescopic assembly includes an abutment block and a retainer; one side of the abutment block has a first abutment surface for contacting the O-ring, and the other side has a second abutment surface for contacting the workpiece. Multiple moving assemblies and telescopic assemblies are evenly arranged along the circumference of the base plate. The driving assembly drives the telescopic assembly to move, thereby evenly stretching the O-ring. The abutment block of the telescopic assembly moves towards the base plate along the axial direction. After the abutment block resets, the retainer keeps it suspended. When installing the O-ring, the workpiece presses down on the abutment block, causing the abutment block to slide relative to the inner surface of the O-ring. After pressing down, the O-ring detaches from the abutment block and is installed onto the workpiece. During the process, the bottom of the O-ring always abuts against the reference block to prevent the O-ring from twisting or deforming.

Description

Technical Field

[0001] This invention relates to the field of mechanical industry technology, and more specifically, to an O-ring installation device with pre-opening and self-returning functions. Background Technology

[0002] O-rings are common sealing components in the machinery industry, generally made of rubber, and are typically fitted onto workpieces. In existing technology, O-rings are usually fitted manually or using an installation device. However, when manually fitting O-rings, the force is unevenly distributed due to the fingers prying the ring open, and manual fitting easily leads to twisting and deformation, resulting in poor installation consistency and low efficiency. One existing installation device for O-ring assembly, a manual labor-saving device, includes a hand-held fixing block, a gripper, and a hand-pressing push plate. The hand-held fixing block is cylindrical, with a long rod extending from one side. Several... The device consists of a cylindrical cylinder with a gripper pin connecting the end of each pin to a clamp. A guide rod is positioned within the cylinder's center, and its lower end connects to a push block located within a circle formed by several pins. This push block is circular with several protrusions around its perimeter, positioned between two pins. A hand-operated push plate connects to the upper end of the guide rod, and a spring is sleeved on the upper part of the guide rod. The hand-operated push plate has a through hole at its front end, which fits onto a guide rod that is vertically mounted on a hand-grip block. The gripper has an inner groove on its lower outer side. This device uses multiple evenly distributed grippers, resulting in relatively uniform force spreading the O-ring around its perimeter, reducing operator fatigue and improving installation quality. However, the device itself is heavy, and the O-ring cannot be locked after pre-installation, requiring prolonged hand gripping. Furthermore, the O-ring slides into the groove during retraction, lacking a pushing function, which can easily lead to O-ring twisting. Summary of the Invention

[0003] To overcome the defects of the prior art in which O-rings are easily twisted when installed, the present invention provides an O-ring installation device with pre-expansion and self-returning.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a pre-opening and self-returning O-ring installation device, comprising: a base plate, a plurality of movable components evenly arranged relative to the circumference of the base plate and sliding radially along the base plate, a telescopic component mounted on the movable components, and a driving component connected to the base plate and used to drive the movable components to reciprocate; the movable component includes a reference block connected to the telescopic component and used to place the O-ring; the telescopic component includes an abutment block slidably connected to the reference block along the axial direction of the base plate and a retaining member connected to the abutment block and keeping the abutment block in an extended state; the abutment block has a first abutment surface on one side for contacting the O-ring and a second abutment surface on the other side for contacting the workpiece.

[0005] Multiple moving components are evenly arranged around the circumference of the base plate. A drive component simultaneously drives these components to move synchronously, either towards or away from the base plate's axis. Simultaneously, multiple telescopic components are installed on the moving components. When placing the O-ring, the moving and telescopic components are positioned close to the base plate's axis, and the O-ring rests on a reference block within each moving component. The reference blocks in each moving component are at the same height, ensuring the O-ring remains horizontal. Driven by the drive component, the moving and telescopic components move away from the base plate's axis, causing the first contact surface of the telescopic component's contact block to contact the inner surface of the O-ring. The telescopic component then moves further away from the base plate's axis, applying tension to the O-ring and causing it to expand. Because each telescopic component moves synchronously, each telescopic assembly... The component can apply a uniform tension to the O-ring, causing all parts of the O-ring to expand evenly. When the O-ring expands to the appropriate size, the workpiece is inserted. At this time, the moving component remains stationary, and the workpiece presses against the second abutment surface of the abutment block, causing the abutment block to move towards the base plate along the normal direction. The abutment block retracts, and then the O-ring separates from the abutment block. The O-ring is then fitted onto the workpiece. After the workpiece is removed, the abutment block returns to its original position and extends outward, remaining in the extended state under the action of the retaining component, awaiting the next fitting operation. The resetting and extension of the abutment block can be done in several ways, such as by manual resetting and pulling it out by the operator. In this case, the abutment block can be a protrusion set on the reference block, with a groove set at the corresponding position on the abutment block. During resetting, the abutment block is locked onto the protrusion through the groove. The abutment block can also reset and extend autonomously. An elastic element can be set at the bottom of the abutment block, which lifts the abutment block and keeps it in the extended state.

[0006] Preferably, the moving component further includes a slider that slides radially along the base plate and a connecting rod connected to the driving component; the end of the slider is connected to the reference block.

[0007] The connecting rod is connected to the drive assembly as a transmission component. The connecting rod and the slider are relatively fixed, and the slider and the reference block are also relatively fixed. The drive assembly drives the connecting rod to reciprocate, which in turn drives the slider and the reference block to reciprocate together.

[0008] Preferably, the driving assembly includes a driving disk rotatably connected to the base plate, a rotating rod connected to the driving disk, and a cover plate connected to the base plate; the driving disk is provided with a plurality of limiting holes respectively cooperating with the connecting rod, the connecting rod is slidably sleeved with the limiting holes, and when the driving disk rotates, it drives the slider to move through the limiting holes; both the driving disk and the cover plate are provided with through holes for avoiding the telescopic assembly, and the bottom of the cover plate is provided with a groove for accommodating the driving disk.

[0009] Both the drive plate and the cover plate have through holes in their centers. The telescopic component moves together with the moving component within the range of the through holes. The bottom of the cover plate has a groove and is connected to the base plate. The drive plate is confined in the groove and rotates within it. The rotating rod is fixedly connected to the drive plate. Pushing the rotating rod causes the drive plate to rotate. The limiting holes on the drive plate correspond one-to-one with multiple moving components. The connecting rod in the moving component extends into the limiting hole. The limiting hole is tilted as a whole, with one side close to the center of the base plate and the other side away from the center of the base plate. When the drive plate is rotated, the limiting hole rotates accordingly, simultaneously driving the connecting rod to move. The connecting rod moves from one side of the limiting hole to the other side. The drive plate reciprocates, driving the moving component to reciprocate.

[0010] Preferably, the limiting hole includes a guide section, a protruding section, and a locking section, wherein the protruding section is located between the guide section and the locking section.

[0011] In the limiting hole, the guide section guides and drives the connecting rod to move back and forth. The protruding section is located between the guide section and the locking section, which restricts the connecting rod and locks it in the locking section, thus realizing the locking function of this device.

[0012] Preferably, the rotating rod is connected to the upper part of the drive disk.

[0013] When the rotating rod is connected to the drive disk, the cover plate needs to make way for the rotating rod. When the rotating rod is connected to the upper part of the drive disk, it is only necessary to enlarge the through hole on the cover plate to make way for the telescopic component. Alternatively, the rotating rod can be connected to the side of the drive disk. In this case, the side of the cover plate needs to be made with a long strip-shaped through groove or through hole to make way for the rotating rod.

[0014] Preferably, a positioning rod is connected between the cover plate and the base plate.

[0015] Setting positioning rods can increase the fitting accuracy between the cover plate and the base plate, ensuring that the cover plate and the base plate are concentrically connected, thereby ensuring that the rotation axis of the drive disc does not deviate; furthermore, there are no fewer than two positioning rods connecting the cover plate and the base plate together, which fully ensures the assembly accuracy.

[0016] Preferably, the cover plate and the base plate are connected by a plurality of connectors, which pass through the cover plate and connect to the base plate.

[0017] Multiple connectors are used to fix the cover plate to the base plate to ensure a stable connection. Each connector is symmetrically arranged relative to the cover plate's axis. The connectors can be bolts that are threaded to the base plate, or bolts or screws that are fixed with nuts. The bolts or screws pass through both the cover plate and the base plate, and nuts are screwed on the bottom of the base plate to achieve a fixed position.

[0018] Preferably, the telescopic assembly further includes a fixing member connected to the abutment block; the retaining member is an elastic member, and its two ends abut against the bottom of the abutment block and the top of the base plate, respectively; the reference block is provided with an elongated mounting hole, and the fixing member passes through the mounting hole and connects to the abutment block.

[0019] The fastener passes through the mounting hole and connects to the abutment block. When the abutment block moves telescopically, the fastener moves up and down within the mounting hole. Meanwhile, the retainer is an elastic element. When fitting the workpiece, the O-ring is fitted onto the workpiece. After the workpiece is removed, the retainer will spring the abutment block back to its original position.

[0020] Preferably, the abutment block is connected to two fixing members, and a gasket is provided between the fixing members and the reference block.

[0021] The two fasteners enable a stable sliding connection between the abutment block and the reference block. The gasket is used to separate the end of the fastener from the reference block, reducing frictional wear on the end of the fastener and increasing the smoothness of the sliding of the abutment block.

[0022] Preferably, the first contact surface is an arc-shaped surface.

[0023] The first contact surface contacts the inner side of the O-ring. Setting it to an arc shape can avoid damage to the O-ring.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] Multiple moving and telescopic components are evenly arranged along the circumference of the base plate. The driving component moves the telescopic components, thereby evenly stretching the O-ring. The abutment block of the telescopic component moves towards the base plate along the axial direction. After the abutment block is reset, the retainer keeps it suspended. When the O-ring is fitted, the workpiece presses down the abutment block, and the abutment block slides relative to the inner side of the O-ring. After pressing down, the O-ring separates from the abutment block and is fitted onto the workpiece. During the process, the bottom of the O-ring always abuts against the reference block to avoid the O-ring from twisting and deforming. Attached Figure Description

[0026] Figure 1 This is a perspective view of an O-ring installation device with pre-opening and self-returning according to the present invention;

[0027] Figure 2 This is an exploded view of some parts of a pre-opening and self-returning O-ring mounting device according to the present invention.

[0028] Figure 3 This is an exploded view of the moving component and the telescopic component of a pre-opening and self-returning O-ring mounting device according to the present invention.

[0029] Figure 4This is a cross-sectional view of an O-ring installation device with pre-opening and self-returning according to the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of the cover plate of a pre-opening and self-returning O-ring mounting device according to the present invention;

[0031] Figure 6 This is a schematic diagram of the drive disc of a pre-opening and self-returning O-ring mounting device according to the present invention.

[0032] In the picture:

[0033] 1. Base plate;

[0034] 2. Moving component; 201. Reference block; 202. Slider; 203. Connecting rod; 204. Mounting hole;

[0035] 3. Telescopic assembly; 301. Abutment block; 302. Retaining member; 303. First abutment surface; 304. Second abutment surface; 305. Fixing member; 306. Gasket;

[0036] 4. O-ring; 5. Workpiece;

[0037] 6. Drive assembly; 601. Drive disc; 602. Rotating rod; 603. Cover plate; 604. Limiting hole; 605. Groove; 606. Guide section; 607. Protruding section; 608. Locking section;

[0038] 7. Positioning rod; 8. Connecting parts. Detailed Implementation

[0039] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0040] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "long," and "short" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0041] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0042] Example 1

[0043] like Figure 1-4 As shown, an O-ring installation device with pre-opening and self-returning features includes: a base plate 1; a plurality of movable components 2 evenly arranged relative to the circumference of the base plate 1 and sliding radially along the base plate 1; a telescopic component 3 mounted on the movable components 2; and a drive component 6 connected to the base plate 1 and used to drive the movable components 2 to reciprocate; the movable component 2 includes a reference block 201 connected to the telescopic component 3 and used to place the O-ring 4; the telescopic component 3 includes an abutment block 301 slidably connected to the reference block 201 along the axial direction of the base plate 1 and a retaining member 302 connected to the abutment block 301 and keeping the abutment block 301 in an extended state; the abutment block 301 has a first abutment surface 303 on one side for contacting the O-ring 4 and a second abutment surface 304 on the other side for contacting the workpiece 5.

[0044] Multiple movable components 2 are evenly arranged around the circumference of the base plate 1. A driving component 6 simultaneously drives these movable components 2 to move synchronously, either towards or away from the axis of the base plate 1. Simultaneously, multiple telescopic components 3 are installed one-to-one on each of the movable components 2. When placing the O-ring 4, the movable components 2 and telescopic components 3 are positioned close to the axis of the base plate 1, and the O-ring 4 is placed on the reference block 201 of the movable component 2. The reference block 201 in each movable component 2 has the same height, ensuring the O-ring 4 remains horizontal. Then, driven by the driving component 6, the movable components 2 and telescopic components 3 move away from the axis of the base plate 1, causing the first abutting surface 303 of the abutting block 301 of the telescopic component 3 to abut against the inner surface of the O-ring 4. The telescopic component 3 further moves away from the axis of the base plate 1, and the first abutting surface 303 applies tension to the O-ring 4, causing it to expand. Since each telescopic component 3 moves synchronously, each telescopic component 3 can evenly... A pulling force is applied to cause the O-ring 4 to expand evenly. When the O-ring 4 expands to a suitable size, the workpiece 5 is inserted. At this time, the moving component 2 remains stationary. The workpiece 5 presses against the second abutment surface 304 of the abutment block 301, causing the abutment block 301 to move towards the base plate 1 along the normal direction. The abutment block 301 retracts, and then the O-ring 4 separates from the abutment block 301. The O-ring 4 is then fitted onto the workpiece 5. After the workpiece 5 is removed, the abutment block 301 returns to its original extended position and remains extended under the action of the retaining member 302. The abutment block 301 can be reset and extended in several ways. For example, it can be manually reset and pulled out by the operator. In this case, the abutment block 301 can be a protrusion set on the reference block 201, and a groove 605 is set at the corresponding position of the abutment block 301. When resetting, the abutment block 301 is stuck on the protrusion through the groove 605. The abutment block 301 can also be reset and extended autonomously. An elastic element can be set at the bottom of the abutment block 301. The elastic element will lift the abutment block 301 and keep it in the extended state.

[0045] In this embodiment, the base plate 1 is placed horizontally, and the base plate 1 is provided with 6 moving components 2 and telescopic components 3 respectively to ensure the uniformity of the tension on the O-ring 4. At the same time, the base plate 1 is also provided with 6 radial grooves, which are used to place the moving components 2, and the moving components 2 move on the grooves.

[0046] The beneficial effects of this embodiment are as follows: Multiple moving components 2 and telescopic components 3 are evenly arranged along the circumference of the base plate 1. The driving component 6 drives the telescopic component 3 to move, thereby evenly stretching the O-ring 4. The abutting block 301 of the telescopic component 3 moves towards the base plate 1 along the axial direction of the base plate 1. After the abutting block 301 is reset, the retaining member 302 keeps it suspended. When the O-ring 4 is fitted, the workpiece 5 presses down on the abutting block 301, and the abutting block 301 slides relative to the inner side of the O-ring 4. After pressing down, the O-ring 4 is separated from the abutting block 301 and fitted onto the workpiece 5. During the process, the bottom of the O-ring 4 always abuts against the reference block 201 to avoid the O-ring 4 from twisting and deforming. At the same time, the O-ring 4 is located at the top of the device and is stuck on the first abutting surface 303. The operator has a good line of sight and can clearly see the O-ring 4, which is easy to operate. During operation, the O-ring 4 is first opened, and the workpiece 5 is pressed down from above. It can adapt to the use of workpieces 5 such as the outer circular groove 605 of the shaft and the groove 605 of the flange, and can adapt to a variety of workpieces 5.

[0047] Example 2

[0048] like Figure 1-6 As shown, the difference between Example 1 and Example 2 is that:

[0049] The moving component 2 also includes a slider 202 that slides radially along the base plate 1 and a connecting rod 203 connected to the driving component 6; the end of the slider 202 is connected to the reference block 201. The driving component 6 includes a driving disk 601 rotatably connected to the base plate 1, a rotating rod 602 connected to the driving disk 601, and a cover plate 603 connected to the base plate 1; the driving disk 601 is provided with a plurality of limiting holes 604 that respectively cooperate with the connecting rod 203, the connecting rod 203 is slidably sleeved with the limiting holes 604, and when the driving disk 601 rotates, it drives the slider 202 to move through the limiting holes 604. Both the driving disk 601 and the cover plate 603 are provided with through holes for avoiding the telescopic component 3, and the bottom of the cover plate 603 is provided with a groove 605 for accommodating the driving disk 601. The limiting hole 604 includes a guide section 606, a protruding section 607, and a locking section 608, with the protruding section 607 located between the guide section 606 and the locking section 608. The rotating rod 602 is connected to the upper part of the driving disk 601. A positioning rod 7 is connected between the cover plate 603 and the base plate 1. The cover plate 603 and the base plate 1 are connected by multiple connectors 8, which pass through the cover plate 603 and connect to the base plate 1.

[0050] The connecting rod 203 is connected to the drive assembly 6 as a transmission component. The connecting rod 203 is relatively fixed to the slider 202, and the slider 202 is also relatively fixed to the reference block 201. The drive assembly 6 drives the connecting rod 203 to reciprocate, which in turn drives the slider 202 and the reference block 201 to reciprocate together. Both the drive disc 601 and the cover plate 603 have through holes at their centers. The telescopic component 3 moves together with the moving component 2 within the range of the through holes. The bottom of the cover plate 603 has a groove 605 and is connected to the base plate 1. The drive disc 601 is confined within the groove 605 and rotates within the groove 605. The rotating rod 602 is fixedly connected to the drive disc 601. Pushing the rotating rod 602 causes the drive disc 601 to rotate. The limiting holes 604 on the drive disc 601 correspond one-to-one with multiple moving components 2. The connecting rod 203 in the moving component 2 extends into the limiting hole 604. The limiting hole 604 is inclined as a whole, with one side close to the center of the base plate 1 and the other side away from the center of the base plate 1. When the drive disc 601 is rotated, the limiting hole 604 rotates accordingly, simultaneously driving the connecting rod 203 to move. The connecting rod 203 moves from one side of the limiting hole 604 to the other side. The reciprocating rotation of the drive disc 601 drives the moving component 2 to reciprocate. Figure 6 As shown, in the limiting hole 604, the guide section 606 guides and drives the connecting rod 203 to reciprocate. The protruding section 607 is located between the guide section 606 and the locking section 608, serving to limit the connecting rod 203 and lock it within the locking section 608, thus realizing the locking function of this device. The rotating rod 602 is connected to the drive disk 601. The cover plate 603 needs to accommodate the rotating rod 602. When the rotating rod 602 is connected to the upper part of the drive disk 601, it is only necessary to enlarge the through hole on the cover plate 603 to accommodate the telescopic component 3. Alternatively, the rotating rod 602 can also be connected to the side of the drive disk 601. In this case, the side of the cover plate 603 needs to have a long, narrow through groove or through hole to accommodate the rotating rod 602. Figure 2 As shown, the positioning rods 7 increase the fitting accuracy between the cover plate 603 and the base plate 1, ensuring that the cover plate 603 and the base plate 1 are concentrically connected, thereby ensuring that the rotation axis of the drive disc 601 does not shift. Furthermore, at least two positioning rods 7 are connected between the cover plate 603 and the base plate 1 to fully ensure assembly accuracy. Multiple connectors 8 are provided to fix the cover plate 603 to the base plate 1, ensuring a stable connection. Each connector 8 is symmetrically arranged relative to the axis of the cover plate 603. The connectors 8 can be bolts threaded to the base plate 1; or they can be bolts or screws with nuts for fixing. The bolts or screws pass through both the cover plate 603 and the base plate 1, and a nut is screwed on the bottom of the base plate 1 to achieve fixation.

[0051] In this implementation, the increased torque of the rotating rod 602 makes it easier to rotate the drive disk 601, saving effort; after the O-ring 4 is opened, it is locked by the protruding section 607 of the limiting hole 604 on the drive disk 601, so that the O-ring 4 cannot fall off, and also avoids the operator from having to push the rotating rod 602 to keep the O-ring 4 open, saving effort.

[0052] The remaining features and working principles of this embodiment are the same as those of Embodiment 1.

[0053] Example 3

[0054] like Figure 1-6 As shown, based on Example 1 or Example 2, Example 1 or Example 2 are further defined, with the difference being:

[0055] The telescopic assembly 3 further includes a fixing member 305 connected to the abutment block 301; the retaining member 302 is an elastic member, and its two ends abut against the bottom of the abutment block 301 and the top of the base plate 1, respectively. The reference block 201 is provided with an elongated mounting hole 204, and the fixing member 305 passes through the mounting hole 204 and connects to the abutment block 301. The abutment block 301 is connected to two fixing members 305, and a gasket 306 is also provided between the fixing member 305 and the reference block 201. The first abutment surface 303 is an arc-shaped surface.

[0056] The fixing member 305 passes through the mounting hole 204 and connects to the abutment block 301. When the abutment block 301 moves telescopically, the fixing member 305 moves up and down within the mounting hole 204. Simultaneously, the retaining member 302 is an elastic element. During assembly, the O-ring 4 is fitted onto the workpiece 5. After the workpiece 5 is removed, the retaining member 302 springs the abutment block 301 back to its original position. The two fixing members 305 enable a stable sliding connection between the abutment block 301 and the reference block 201. The gasket 306 separates the end of the fixing member 305 from the reference block 201, reducing frictional wear on the end of the fixing member 305 and increasing the smoothness of the sliding of the abutment block 301. The first abutment surface 303 contacts the inner surface of the O-ring 4; its arc shape prevents damage to the O-ring 4.

[0057] like Figure 3 As shown, in this embodiment, the fixing component 305 is a shoulder screw. The fixing component 305 is threadedly connected to the abutment block 301. The fixing component 305 is tightened onto the abutment block 301 by the shoulder portion, ensuring smooth movement and a stable connection. Meanwhile, the elastic component is a spring, which can be made of stainless steel. The bottom of the abutment block 301 has a raised cylinder, on which the spring is fitted. The cylinder restricts the spring and prevents it from falling off. At the same time, the slider 202 also has a cylinder for holding the spring.

[0058] The remaining working principles and processes of this embodiment are the same as those of Embodiment 1 or Embodiment 2.

[0059] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A pre-opening and self-returning O-ring installation device, characterized in that, include: The base plate (1), a plurality of movable components (2) evenly arranged around the circumference of the base plate (1) and sliding radially along the base plate (1), a telescopic component (3) mounted on the movable components (2), and a drive component (6) connected to the base plate (1) and used to drive the movable components (2) to reciprocate; the movable component (2) includes a reference block (201) connected to the telescopic component (3) and used to place an O-ring; the telescopic component (3) includes a component that slides along the axial direction of the base plate (1) with the reference block (201). The moving assembly (2) includes an abutment block (301) and a retainer (302) connected to the abutment block (301) and keeping the abutment block (301) in an extended state; the abutment block (301) has a first abutment surface (303) on one side for contacting the O-ring and a second abutment surface (304) on the other side for contacting the workpiece; the moving assembly (2) also includes a slider (202) that slides radially along the base plate (1) and a connecting rod (203) connected to the driving assembly (6); the end of the slider (202) is connected to the reference... The block (201) is connected; the driving assembly (6) includes a driving disk (601) rotatably connected to the base plate (1), a rotating rod (602) connected to the driving disk (601), and a cover plate (603) connected to the base plate (1); the driving disk (601) is provided with a plurality of limiting holes (604) respectively cooperating with the connecting rod (203), the connecting rod (203) is slidably sleeved with the limiting holes (604), and when the driving disk (601) rotates, it drives the slider through the limiting holes (604). (202) Moving, the drive disk (601) and the cover plate (603) are both provided with through holes for avoiding the telescopic component (3), and the bottom of the cover plate (603) is provided with a groove (605) for accommodating the drive disk (601); the limiting hole (604) includes a guide section (606), a protruding section (607) and a locking section (608), the protruding section (607) is located between the guide section (606) and the locking section (608), and the rotating rod (602) is connected to the upper part of the drive disk (601).

2. The O-ring installation device with pre-opening and self-returning as described in claim 1, characterized in that: A positioning rod (7) is connected between the cover plate (603) and the bottom plate (1).

3. The O-ring installation device with pre-opening and self-returning as described in claim 1, characterized in that: The cover plate (603) and the base plate (1) are connected by a plurality of connectors (8), which pass through the cover plate (603) and connect to the base plate (1).

4. The pre-opening and self-returning O-ring installation device according to any one of claims 1-3, characterized in that: The telescopic assembly (3) also includes a fixing member (305) connected to the abutment block (301); the retaining member (302) is an elastic member, and its two ends abut against the bottom of the abutment block (301) and the top of the base plate (1) respectively. The reference block (201) is provided with a long strip-shaped mounting hole (204), and the fixing member (305) passes through the mounting hole (204) and connects to the abutment block (301).

5. The O-ring installation device with pre-opening and self-returning as described in claim 4, characterized in that: The abutment block (301) is connected to two fasteners (305), and a gasket (306) is provided between the fasteners (305) and the reference block (201).

6. The O-ring installation device with pre-opening and self-returning as described in claim 4, characterized in that: The first contact surface (303) is an arc-shaped surface.

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