A piston clip assembly device

Abstract

The utility model relates to the technical field of piston snap spring assembly, specifically relates to a piston snap spring assembly device, and the first cylinder is borne to the assembling plate, the first piston rod drive sliding seat moves along the sliding frame, makes the lower module of sliding seat top can completely remove the assembly station, provides the open operation space outside the device, after the operating personnel put the piston work piece into the lower module mould groove, second cylinder pushes the connecting plate and lower inclined cylinder and presses the work piece top, the snap spring is placed into the lower inclined cylinder, and the sliding seat resets, the hydraulic cylinder drives the sliding plate and moves down along the sliding rod, makes the guide rod of upper module insert lower module guide hole and realizes the mould closing positioning, and simultaneously, the top pressure rod inserts the lower inclined cylinder and presses down the snap spring, the conical inner wall of lower inclined cylinder forces the snap spring to shrink evenly and enter the piston inner chamber, and finally, the snap spring expands at the piston card groove and completes the assembly, the design breaks through the traditional equipment space closed limitation, realizes the external preassembly through the lower module horizontal removal, and the conical pressing synergy is combined with the guide mechanism, and the safety and assembly precision are improved.

Description

Technical Field

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

[0002] ① Traditional piston circlip assembly generally relies on manual operation. The worker must hold the piston with one hand while using a tool in the other to force the circlip into the annular groove on the piston's inner wall. Because the circlip itself is highly elastic and tiny, it is prone to slippage or uneven deformation when manually applied pressure. This assembly method is time-consuming and labor-intensive, requires a high level of operator experience, and assembly accuracy is difficult to guarantee, resulting in low overall efficiency.

[0003] ② To address the efficiency issues of manual assembly, a fixed press-fitting device is currently used. This device has a piston positioning module installed on a base and a hydraulic pressure rod mechanism on top. During operation, the piston is placed in the positioning module, and then the retaining ring is placed on top of the piston. After starting the device, the pressure rod presses down vertically to press the retaining ring into the piston. This solution replaces manual operation with mechanical pressure, ensuring uniform and stable force during the retaining ring pressing process, significantly shortening the assembly time of a single part and improving consistency.

[0004] ③ While press-fitting equipment improves pressing efficiency, its structure presents fundamental operational obstacles: the positioning module of the equipment base is rigidly connected to the upper pressure rod mechanism, and the narrow space between them severely restricts the manual operation area. When placing the piston workpiece and deploying the retaining ring, the operator must complete the action within a confined space of several centimeters directly below the pressure rod, severely limiting the range of arm movement and field of vision. If an attempt is made to pre-place the retaining ring on the piston outside the equipment before moving the entire assembly into the equipment, external assembly is impossible because the positioning module is fixed to the equipment body. This problem directly results in the retaining ring pre-assembly step being more time-consuming than manual assembly, constituting an efficiency bottleneck. Utility Model Content

[0005] The purpose of this utility model is to provide a piston snap ring assembly device, which solves the technical problem of pre-assembly space enclosure caused by the rigid connection between the positioning module and the pressing mechanism in press-fitting equipment.

[0006] To achieve the above objectives, this utility model provides a piston snap ring assembly device, including an assembly plate. A first cylinder is bolted to one side of the top of the assembly plate. A first piston rod is provided at the output end of the first cylinder. The first piston rod passes through a sliding frame and is bolted to a sliding seat. The sliding frame is fixedly located on the top of the assembly plate near the output end of the cylinder. The sliding seat is slidably installed in the sliding frame. The sliding seat is driven by the first cylinder to move horizontally along the sliding frame, so that the lower module can be completely moved out of the assembly station, providing an external space for the operator to pick up and put down materials. The lower module is bolted to the top of the sliding seat. Guide holes are provided at the four corners of the top of the lower module, and a mold groove is provided in the middle of the top of the lower module.

[0007] The lower module has a second cylinder installed on the top side adjacent to the mold groove by bolts. The output end of the second cylinder is provided with a second piston rod, and the top of the second piston rod is installed with a connecting plate by bolts.

[0008] The connecting plate has a lower inclined cylinder fixedly installed at the end away from the piston rod, and the lower inclined cylinder and the mold groove are kept on the same central axis.

[0009] The assembly plate is bolted to the top of the support base, and sliding rods are fixedly installed at the four corners of the top of the support base. An upper support seat is fixedly installed at the top of the sliding rods.

[0010] A hydraulic cylinder is bolted to the top of the support base, and a hydraulic rod is provided at the output end of the hydraulic cylinder. The hydraulic rod passes vertically through the upper support base and is connected to the sliding plate.

[0011] The sliding plate is connected to the outside of the sliding rod through preset sliding holes at its four corners. The upper module is installed at the bottom of the sliding plate by bolts. Guide rods are fixedly installed at the four corners of the upper module. A top pressure rod is fixedly installed on the side of the upper module near the center.

[0012] The support base has a fixed plate at its bottom, and a diagonal brace is provided at the connection between the fixed plate and the support base to form a triangular support. The fixed plate has fixing holes at its four corners, which are used for bolts to pass through and fix the whole to the ground.

[0013] This utility model discloses a piston snap ring assembly device. A basic support platform is constructed using an assembly plate, with a first cylinder fixedly installed on one side of its top. The first piston rod, connected to the output end of the first cylinder, passes through a sliding frame and is rigidly connected to a sliding seat slidably mounted inside the sliding frame. The sliding frame, acting as a horizontal guide structure, is fixed to the side of the first cylinder's output end on the assembly plate, constraining the sliding seat to move only horizontally along its track. The core of this design is that, driven by the cylinder, the sliding seat can completely move the lower module, bolted to its top, out of the initial assembly area, creating an unobstructed external operating space for the operator. The guide holes at the four corners of the lower module's top and the mold groove at the center work together: the mold groove precisely supports the piston workpiece, while the guide holes form a positioning coupling with the subsequent pressing module.

[0014] When the first cylinder pushes the sliding seat out, the operator can place the piston workpiece into the mold groove in the open space. At this time, the second cylinder installed on the side of the lower module is activated, and its output end second piston rod pushes the connecting plate and the lower inclined cylinder at the front end of the connecting plate to move upward, so that the lower inclined cylinder is precisely pressed against the top of the piston workpiece, and its central axis always coincides with the axis of the mold groove; after the snap ring is inserted into the top opening of the lower inclined cylinder, the first cylinder drives the sliding seat to reset to the assembly position; the hydraulic cylinder then drives the hydraulic rod to push the sliding plate to move vertically downward along the sliding rod, driving the upper module to move downward; the guide rods at the four corners of the upper module first insert into the guide holes of the lower module to achieve precise positioning, while the top pressure rod in the center of the upper module inserts into the lower inclined cylinder to apply pressure, forcing the snap ring to contract and slide downward along the inclined surface of the inner wall of the lower inclined cylinder; the unique conical inner wall structure of the lower inclined cylinder continuously applies radial constraint force during the downward movement of the snap ring, so that the snap ring contracts evenly and smoothly enters the piston cavity; when the top pressure rod pushes the snap ring to the snap groove position on the inner wall of the piston, the snap ring automatically expands and embeds into the groove due to being freed from the conical constraint.

[0015] This innovative horizontal moving structure breaks through the spatial constraints of traditional fixed equipment: the complete removal of the lower module allows the piston placement and snap ring deployment actions to be completed efficiently in an open space, eliminating the physical interference of the equipment frame on manual operation; the precise fit between the guide rod and the guide hole after resetting ensures zero positioning deviation in the pressing process; the coordinated action of the lower inclined cylinder and the top pressure rod ensures precise control of the snap ring during the contraction-expansion deformation process; the entire mechanism achieves a leap in ease of operation, assembly accuracy, and efficiency through the seamless connection of the four-step process of removal, pre-installation, resetting, and pressing. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0018] Figure 2 This is a schematic diagram of the structure of the support base according to an embodiment of the present utility model.

[0019] Figure 3 This is a schematic diagram of the structure of the sliding plate in an embodiment of this utility model.

[0020] Figure 4 This is a schematic diagram of the assembly plate in an embodiment of the present invention.

[0021] In the diagram: 101, Assembly plate; 102, First cylinder; 103, First piston rod; 104, Sliding frame; 105, Sliding seat; 106, Lower module; 107, Guide hole; 108, Mold groove; 109, Second cylinder; 110, Second piston rod; 111, Connecting plate; 112, Lower inclined cylinder; 113, Support base; 114, Sliding rod; 115, Upper support seat; 116, Hydraulic cylinder; 117, Hydraulic rod; 118, Sliding plate; 119, Upper module; 120, Guide rod; 121, Top pressure rod; 122, Fixing plate; 123, Inclined brace plate; 124, Fixing hole. Detailed Implementation

[0022] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0023] Please see Figures 1-4 .

[0024] This utility model provides a piston snap ring assembly device. The core structure of the device is an assembly plate 101, which serves as the basic installation platform. A support base 113 provides stable support for the entire device. The assembly plate 101 is fixed to the top of the support base 113 with bolts. At the bottom of the support base 113, a fixing plate 122 is reliably connected to the ground with bolts and bolts passing through its four corner fixing holes 124. An inclined brace 123 is set at the connection between the fixing plate 122 and the support base 113, forming a stable triangular support structure, further enhancing the device's anti-overturning ability. At the four corners of the top of the support base 113, sliding rods 114 are vertically fixedly installed, and upper support seats 11 are fixedly installed at the top of the sliding rods 114. 5. A hydraulic cylinder 116 is bolted to the upper support 115. The output end of the hydraulic cylinder 116 is a hydraulic rod 117, which passes vertically downward through the upper support 115 and connects to the sliding plate 118. The four corners of the sliding plate 118 have pre-set sliding holes, which are precisely fitted onto the outside of the sliding rod 114 to ensure that the sliding plate 118 can slide up and down along the sliding rod 114, providing precise guidance for vertical movement. The bottom end of the sliding plate 118 is bolted to the upper module 119, which is an important upper pressing component. Guide rods 120 are fixedly installed at its four corners, and a top pressing rod 121 is fixedly installed near the center. The guide rods 120 are used for mold closing and positioning, and the top pressing rod 121 is used for pushing and locking. The core component of the spring; a first cylinder 102 is bolted to one side of the top of the assembly plate 101. The first cylinder 102 provides horizontal movement power, and its output end is provided with a first piston rod 103. The first piston rod 103 passes through a sliding frame 104 fixed to the top of the assembly plate 101 near the cylinder output end and is bolted to a sliding seat 105. The sliding seat 105 is a horizontally moving load-bearing component, slidably mounted inside the sliding frame 104, and driven by the first cylinder 102 to move horizontally along the sliding frame 104. The top of the sliding seat 105 is bolted to the key lower module 106, which is the base for placing the piston workpiece. Guide holes 107 are opened at the four corners of the top of the lower module 106. The lower module 106 is used to cooperate with the guide rod 120 for precise positioning. A mold groove 108 is opened at the middle of the top of the lower module 106. The mold groove 108 is used to accommodate and position the piston workpiece to be assembled. In order to perform pre-compression of the snap ring, a second cylinder 109 is bolted to the side of the lower module 106 adjacent to the mold groove 108. The second cylinder 109 is used to provide pre-compression force. A second piston rod 110 is provided at its output end. A connecting plate 111 is bolted to the top of the second piston rod 110. A lower inclined cylinder 112 with a specific shape is fixedly installed at the end of the connecting plate 111 away from the piston rod. The lower inclined cylinder 112 is designed to be on the same central axis as the mold groove 108. Its inclined inner wall structure guides and contracts the snap ring.

[0025] Working principle: When the device starts working, the first cylinder 102 on the top of the support base 113 is activated, and its first piston rod 103 drives the sliding seat 105 inside the sliding frame 104 to move horizontally outward along the fixed slide rail, thereby completely removing the lower module 106 fixed on the top of the sliding seat 105 from the assembly area, providing the operator with a wide and safe operating space; at this time, the operator accurately places the piston workpiece to be installed with the snap ring into the mold groove 108 in the center of the top surface of the lower module 106. After the workpiece is placed in place, the second cylinder 109 located on the side of the lower module 106 is activated, and its output end second piston rod 110 is driven to retract, driving the piston rod 106 fastened to the lower module 106 to retract. The connecting plate 111, together with the lower inclined cylinder 112 at its front end, moves together, pressing the lower inclined cylinder 112 against the top of the piston workpiece already placed in the mold groove 108 of the lower module 106. At this time, the lower inclined cylinder 112, the piston workpiece, and the mold groove 108 are on the same central axis. Then, the operator inserts the retaining ring into the top opening of the lower inclined cylinder 112. At this time, the first cylinder 102 moves again, driving the sliding seat 105 to move horizontally inward, so that the lower module 106, together with the piston workpiece, the lower inclined cylinder 112, and the retaining ring inside, returns to the original assembly center position, preparing for the subsequent pressing process. After the assembly position is ready, the hydraulic cylinder at the top of the device... When 116 is activated, its hydraulic rod 117 pushes the sliding plate 118 vertically downward. The four corners of the sliding plate 118 are precisely fitted onto the outside of the sliding rod 114, which is vertically fixed around the support base 113, through preset sliding holes. Its downward movement thus obtains precise linear guidance and stable support. As the sliding plate 118 moves downward, the upper module 119, which is fixed at its bottom, also moves downward synchronously. When the upper module 119 moves downward, the guide rods 120 extending from its four corners will first accurately insert into the guide holes 107 at the four corners of the top surface of the lower module 106, further ensuring the alignment accuracy of the upper and lower molds. At the same time, the top pressure rod 121, which is fixed in the center of the upper module 119, inserts into the lower module 106. Inside the lower inclined cylinder 112, its front end touches the retaining ring placed in the cylinder and applies continuous pressure to force the retaining ring to move downward along the inside of the lower inclined cylinder 112. Since the inner wall of the lower inclined cylinder 112 is designed to gradually slope and converge towards the center from top to bottom, forming a continuous conical inclined surface, when the retaining ring is driven by the downward pressure of the top pressure rod 121, it will be subjected to continuous and balanced inward squeezing force from the inner wall of the cone during the process of sliding down along the conical inclined surface. This causes the retaining ring to undergo uniform elastic radial contraction, and its effective outer diameter gradually decreases. This achieves controllable deformation of the retaining ring during the compression process, allowing the retaining ring to pass smoothly through the inner hole at the top of the piston workpiece and enter its internal cavity.The top pressure rod 121 continues to descend, pushing the snap ring, which has already retracted and fully entered the piston workpiece, further downward along the piston's inner wall. When the snap ring, under the continuous action of the top pressure rod 121, reaches the pre-made annular groove on the piston's inner wall, the downward thrust from the top pressure rod 121 disappears, and the conical cylinder constraint is released. Due to its inherent elasticity and restoring force, the snap ring instantly expands outward within the groove on the piston's inner wall, restoring its original size or shape to match the groove. Finally, it is firmly and precisely embedded and fitted into the groove on the piston's inner wall, thus efficiently and reliably completing the piston snap ring assembly process. This entire coordinated process ensures ease of operation, precise positioning, and smooth and reliable snap ring insertion.

[0026] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A piston retaining ring assembly device, comprising an assembly plate (101), characterized in that: A first cylinder (102) is bolted to one side of the top of the assembly plate (101). The output end of the first cylinder (102) is provided with a first piston rod (103). The first piston rod (103) passes through the sliding frame (104) and is bolted to the sliding seat (105). The sliding frame (104) is fixedly located on the top of the assembly plate (101) near the output end of the cylinder. The sliding seat (105) is slidably installed in the sliding frame (104). The sliding seat (105) is driven by the first cylinder (102) to move horizontally along the sliding frame (104), so that the lower module (106) can be completely moved out of the assembly station, providing an external space for the operator to pick up and put down materials. The lower module (106) is bolted to the top of the sliding seat (105). Guide holes (107) are opened at the four corners of the top of the lower module (106). A mold groove (108) is opened in the middle of the top of the lower module (106).

2. The piston snap ring assembly device as described in claim 1, characterized in that: The lower module (106) is equipped with a second cylinder (109) on the side adjacent to the mold groove (108) by bolts. The output end of the second cylinder (109) is provided with a second piston rod (110), and the top end of the second piston rod (110) is equipped with a connecting plate (111) by bolts.

3. The piston snap ring assembly device as described in claim 2, characterized in that: A lower inclined cylinder (112) is fixedly installed on the end of the connecting plate (111) away from the piston rod. The lower inclined cylinder (112) and the mold groove (108) are kept on the same central axis.

4. The piston snap ring assembly device as described in claim 3, characterized in that: The assembly plate (101) is bolted to the top of the support base (113). Sliding rods (114) are fixedly installed at the four corners of the top of the support base (113), and an upper support seat (115) is fixedly installed at the top of the sliding rods (114).

5. A piston snap ring assembly device as described in claim 4, characterized in that: A hydraulic cylinder (116) is bolted to the top of the upper support (115). The output end of the hydraulic cylinder (116) is provided with a hydraulic rod (117). The hydraulic rod (117) passes vertically through the upper support (115) and is connected to the sliding plate (118).

6. The piston snap ring assembly device as described in claim 5, characterized in that: The four corners of the sliding plate (118) are connected to the outside of the sliding rod (114) through preset sliding holes. The bottom end of the sliding plate (118) is bolted to the upper module (119). The four corners of the upper module (119) are fixedly installed with guide rods (120). The upper module (119) is fixedly installed with a top pressure rod (121) on the side near the center.

7. A piston snap ring assembly device as described in claim 6, characterized in that: A fixing plate (122) is fixedly installed at the bottom of the support base (113). A diagonal brace (123) is provided at the connection between the fixing plate (122) and the support base (113) to form a triangular support. Fixing holes (124) are opened at the four corners of the fixing plate (122). The fixing holes (124) are used for bolts to pass through and fix the whole to the ground.

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