Self-adapting press-fitting device for shell periphery sealing ring

Abstract

The application discloses a self-adaptive press-fitting device for a shell peripheral sealing ring and belongs to the technical field of automatic assembly. The device comprises four independent quarter circular blocks, a power mechanism for synchronously expanding and contracting the quarter circular blocks in the radial direction, a ring-shaped pushing sleeve sleeved on the outer periphery of the circular block enclosed cylindrical surface, and an axial driving part for driving the axial sliding of the pushing sleeve. The four circular blocks are expanded outward to be enclosed into a complete cylindrical outer wall surface, uniformly holding the sealing ring, and the pushing sleeve can axially push the top surface of the sealing ring under the driving of the axial driving part, so that the sealing ring is separated. The complete cylindrical surface formed by the circular blocks is used for uniformly supporting the whole peripheral surface of the sealing ring, and deformation and scratching are avoided; when the mold is demolded, the circular blocks are kept in the supporting state, and the sealing ring is axially scraped and pushed by the pushing sleeve, so that the deviation problem of the traditional shrinkage demolding is solved, and the assembly precision and success rate are high.

Description

Technical Field

[0001] This invention relates to the field of automated assembly technology, specifically to an expansion and demolding assembly for uniformly expanding and precisely fitting an elastic sealing ring into a designated installation position on the outer surface of a workpiece, and an adaptive pressing device including the assembly. Background Technology

[0002] In the manufacturing process of products such as plugs and connectors, it is often necessary to accurately fit annular elastic sealing rings into designated positions on the outer surface of the product, such as the bottom of threads or steps. The sealing rings are usually made of elastic materials such as rubber or silicone. Their inner diameter is much smaller than the outer diameter of the position to be assembled in its natural state. Therefore, the sealing ring must be pre-expanded evenly to a size larger than the outer diameter to be assembled before it is transferred and fitted into the designated position.

[0003] Currently, multi-lobed opening claws or thin rods are commonly used in automated assembly to open the sealing ring. Multi-lobed opening claws consist of several claws distributed along the circumference; as the claws expand outwards, they open the sealing ring. However, there are structural gaps between the claws, leaving the sealing ring partially suspended without support. This results in a non-circular profile during opening, uneven opening, and line or even point contact between the claws and the inner wall of the sealing ring. This concentrated stress easily leads to twisting, deformation, or even surface scratches on the sealing ring. Thin rod opening methods also present similar problems; the contact between the thin rod and the sealing ring is point or line contact, resulting in even higher stress concentration.

[0004] On the other hand, the demolding process, where the sealing ring is expanded and delivered above the installation position, is also a challenge in the industry. The traditional method involves retracting the expanding claws, relying on the sealing ring's own elastic recoil to detach it from the claws and enclose it on the workpiece. However, during the retraction process, the direction and magnitude of the frictional forces between the claws and the inner wall of the sealing ring are inconsistent. This makes the sealing ring prone to misalignment, flipping, or bouncing during elastic recoil, preventing it from accurately landing in the narrow, stepped installation position, thus compromising assembly success. These defects are particularly prominent in applications like plug outer sealing rings, which need to be installed to the bottom of the thread, because the axial space at the installation position is limited, requiring extremely high positioning accuracy and posture.

[0005] Another existing solution is to use a tapered mandrel to open the seal ring and then push it out along the tapered surface for installation. Although this solution can achieve push-out installation, the seal ring experiences severe friction when moving on the tapered surface, which can easily lead to seal ring twisting and surface damage, and it is not suitable for thin seal rings.

[0006] Therefore, how to achieve uniform force distribution throughout the circumference of the sealing ring during the expansion process, and stable and controllable release during the demolding process, has become an urgent technical problem to be solved. Summary of the Invention

[0007] This invention provides an adaptive pressing device for a housing outer circumferential sealing ring, including a basic frame, a lateral displacement drive assembly, a Z-axis vertical lifting drive module, and a sealing ring opening and demolding assembly. The sealing ring opening and demolding assembly includes four independent quarter-circle blocks, a power mechanism, a pusher sleeve, and an axial drive component. The power mechanism drives the four quarter-circle blocks to expand and contract radially synchronously. The pusher sleeve is fitted onto the outer periphery of the cylindrical surface formed by the quarter-circle blocks. The axial drive component drives the pusher sleeve to slide axially. The four quarter-circle blocks expand outward to form a complete cylindrical outer wall surface. The pusher sleeve pushes the top surface of the sealing ring along the cylindrical surface to detach it.

[0008] Furthermore, in the expanded state, the sides of the four arc blocks come into contact with each other, forming a complete cylindrical surface without gaps.

[0009] Furthermore, the power mechanism includes a conical push block and a miniature cylinder that drives the conical push block to move axially. The outer conical surface of the conical push block engages with the inclined surface of the inner wall of the arc block to convert axial motion into radial motion. The cone angle of the outer conical surface of the conical push block is smaller than the self-locking friction angle.

[0010] Furthermore, the axial drive component that drives the pusher sleeve is independent of the power mechanism.

[0011] Furthermore, it also includes a base for mounting the axial drive and power mechanism, the base being used to connect an external lifting drive device.

[0012] Furthermore, it also includes a limiting block for limiting the downward stop of the pusher sleeve, so that the lower end face of the pusher sleeve stops at a predetermined position after the sealing ring disengages from the cylindrical surface.

[0013] Furthermore, it also includes a sealing ring feeding assembly located in front of the base frame, comprising a linear vibrating feeder and a dispensing cylinder for conveying individual sealing rings to the pick-up position.

[0014] Furthermore, it also includes a housing positioning base for securing the housing to be assembled.

[0015] Furthermore, the Z-axis vertical lifting drive module simultaneously performs a slight upward movement when the pusher sleeve pushes the sealing ring downward.

[0016] Furthermore, the inner peripheral edge of the pusher sleeve is a right-angled sharp edge or has an inwardly pointing annular protrusion.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Non-destructive support and anti-torsion: Four quarter-circular arc blocks are spliced ​​together to form a complete cylindrical surface, upgrading the contact method when the sealing ring is opened from the traditional point / line contact to the contact of the entire cylindrical surface. After the sealing ring is opened, all parts of the inner circumference surface maintain surface contact with the outer wall of the arc block, the radial expansion displacement is consistent, the stress distribution is uniform, and the local deformation and surface damage of the sealing ring are effectively avoided.

[0018] 2. Precise pushing and interference-free demolding: During demolding, the arc block remains in an open state. The independently driven pusher sleeve scrapes and pushes the top surface of the sealing ring along the outer wall of the cylinder. The sealing ring is detached in a controlled manner with a complete circular posture. It does not rely on the elastic contraction of the sealing ring itself, which overcomes the problem of misalignment and overturning of the sealing ring caused by inconsistent friction during traditional shrinkage demolding. The positioning accuracy and installation success rate are significantly improved.

[0019] 3. Decoupling of actions and high compatibility: The driving component of the pusher sleeve and the power mechanism of the arc block are independent of each other. The demolding action and the opening action are structurally decoupled. The stroke and speed of the two can be adjusted independently, which is convenient to adapt to the opening amount, installation depth and pushing force requirements of different specifications of sealing rings. The product has good compatibility and is easy to adjust and maintain. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of one embodiment of the present invention. The figure shows the overall layout of the automated installation mechanism, which mainly consists of a basic frame, a lateral displacement drive assembly, a Z-axis vertical lifting drive module, a sealing ring opening and demolding assembly, and a sealing ring feeding assembly. Figure 1 Below is a magnified view that highlights the combined structure and spatial relative position of the quarter-circle block and the pusher sleeve in the demolding assembly.

[0022] Figure 2 for Figure 1 The side view of the device further clarifies the assembly height relationship of each functional module along the vertical direction. The enlarged view below it highlights the inclined surfaces on the inner walls of the four quarter-circular blocks and shows the fit of the sealing ring around the cylindrical surface formed by the assembled quarter-circular blocks.

[0023] Figure 3This is a schematic diagram showing the structural details of the automated installation mechanism. It mainly reveals the support frame consisting of the vertical support columns and the horizontal cantilever beams of the basic frame, the transmission cooperation between the guide rod cylinder and the slide in the horizontal displacement drive assembly, and the power transmission structure of the servo motor driving the vertical slide in the Z-axis vertical lifting drive module.

[0024] Figure 4 This is a three-dimensional structural schematic diagram from another perspective of the present invention, which fully shows the state of the sealing ring opening demolding component installed at the end of the Z-axis module, and intuitively presents the spatial layout of the feeding component relative to the base frame, as well as the overall coordination relationship of each motion axis (lateral displacement, vertical lifting).

[0025] The correspondence between the numbers and component names in the diagram is as follows: 01 sealing ring, 1 basic frame, 11 vertical support column, 12 horizontal cantilever beam, 2 horizontal displacement drive assembly, 21 guide rod cylinder, 22 slide table, 3 Z-axis vertical lifting drive module, 31 servo motor, 32 vertical slide table, 4 sealing ring opening and demolding assembly, 41 base, 42 quarter circle block, 421 inclined plane, 43 power mechanism, 44 push sleeve, 45 axial drive component, 46 limit stop, 5 sealing ring feeding assembly, 51 linear vibrating feeder, 52 material distribution cylinder. Detailed Implementation

[0026] This embodiment provides an adaptive pressing device for a housing outer circumferential sealing ring, which includes a base frame 1, a lateral displacement drive assembly 2, a Z-axis vertical lifting drive module 3, a sealing ring opening and demolding assembly 4, a sealing ring feeding assembly 5, and a housing positioning base.

[0027] The basic frame 1 consists of vertical support columns 11 and horizontal cantilever beams 12, providing a rigid base for the entire device. The horizontal displacement drive assembly 2 is a guide rod cylinder 21, which is fixed to the horizontal cantilever beams 12 of the basic frame 1, and its slide table 22 can reciprocate along the horizontal X direction.

[0028] The Z-axis vertical lifting drive module 3 is installed on the slide table 22, including a servo motor 31, a ball screw and a linear guide rail; the servo motor 31 drives a vertical slide table 32 to rise and fall along the linear guide rail through the ball screw, and a sealing ring is installed at the bottom of the vertical slide table 32 to open the demolding component 4.

[0029] The sealing ring release assembly 4 includes a mounting base 41 on which a power mechanism 43 and four independent quarter-circle blocks 42 are mounted.

[0030] The power mechanism 43 includes a miniature cylinder located at the top and a conical push block located at the bottom. The piston rod of the miniature cylinder is fixedly connected to the conical push block. The conical push block has an outer conical surface with a cone angle smaller than the self-locking friction angle, and adopts a Morse taper with a cone angle of 5 to 7 degrees. Four arc blocks 42 are arranged around the conical push block, and the inner wall of each arc block 42 is provided with an inclined surface 421 that mates with the outer conical surface of the conical push block.

[0031] When the miniature cylinder drives the conical pusher block downwards, the outer conical surface of the pusher block pushes against the inclined surface 421 of the four arc blocks 42, converting the axial motion into a synchronous radial outward expansion motion of the arc blocks 42. When the miniature cylinder drives the conical pusher block to return to its original position, the arc blocks 42 contract radially inwards under the action of the elastic reset element or their own gravity. When the conical pusher block reaches its lower stop point, a mechanical self-lock occurs between the outer conical surface and the inclined surface 421, so that even if the miniature cylinder is de-aired, the arc blocks 42 can still be stably maintained in the expanded state. The central angle of each of the four arc blocks 42 is 90 degrees. After expansion, the sides of adjacent arc blocks fit together and contact each other, and the outer arc surfaces together define a gapless, complete cylindrical outer wall surface.

[0032] A pusher sleeve 44 is fitted around a cylindrical surface formed by four arc blocks 42. The pusher sleeve 44 is an annular cylindrical structure with an inner diameter slightly larger than the outer diameter of the cylindrical surface, forming a clearance fit with a clearance of 0.05 to 0.1 mm. The upper end of the pusher sleeve 44 is fixedly connected to the driving end of an axial drive component 45 via a connector. In this embodiment, the axial drive component 45 is specifically an external cylinder, which is mounted on a base 41 and is independent of the power mechanism 43 that drives the arc blocks 42. A limit stop 46 is provided on the cylinder body of the axial drive component 45 or on the base 41 to limit the retraction stroke of the axial drive component 45, thereby precisely controlling the downward stop point of the pusher sleeve 44. The limit stop 46 is an adjustable limit screw, and the stop point position is adjusted by the thread to adapt to the push-off requirements of sealing rings of different lengths.

[0033] In another embodiment, the limiting block 46 is a mechanical stop fixed to the base. In yet another embodiment, the limiting block 46 can adopt an electronic limiting method based on a displacement sensor. The displacement sensor detects the downward position of the pusher sleeve 44, and when it detects that the sealing ring has disengaged from the cylindrical surface, it sends a signal to the controller, which then stops the axial drive 45, thereby achieving precise electronic stroke control.

[0034] The sealing ring feeding assembly 5 includes a linear vibrating feeder 51 and a distributing cylinder 52. The linear vibrating feeder 51 has a linear feed channel in which the sealing rings are vibrated and conveyed forward. The distributing cylinder 52 consists of two miniature cylinders arranged one in front of the other, which alternately extend and retract during operation to isolate and release individual sealing rings to the material waiting position.

[0035] The housing positioning base is located on the side of the feeding assembly 5 and is in the shape of a vertical cylinder. The top is used to position and place the housing to be assembled. The outer surface of the housing has a sealing ring installation position, specifically a threaded bottom base.

[0036] The working process of this embodiment is as follows: Step S1: The linear vibrating feeder 51 continuously outputs the sealing rings, and the distributing cylinder 52 pushes a single sealing ring to the material waiting position.

[0037] Step S2: The lateral shifting drive component 2 is activated, driving the Z-axis vertical lifting drive module 3 to move horizontally to directly above the material picking waiting position; the Z-axis vertical lifting drive module 3 drives the demolding component 4 to descend. At this time, the arc block 42 is in a contracted state, and the outer diameter of the four arc blocks is smaller than the inner diameter of the sealing ring, so they can smoothly pass through the inner hole of the sealing ring.

[0038] Step S3: The miniature cylinder of the power mechanism 43 actuates, driving the conical pusher block to move downward, pushing the four arc blocks 42 to expand radially outward simultaneously until the sides of adjacent arc blocks meet and form a complete cylindrical surface, evenly spreading the sealing ring and surrounding it. Figure 2 The sealing ring 01 is fitted onto the four arc blocks 42 and delivered to the upper edge of the plug installation position.

[0039] Step S4: The lateral displacement drive assembly 2 reverses its direction and moves the expansion demolding assembly 4 carrying the sealing ring to the top of the housing positioning base; the Z-axis vertical lifting drive module 3 descends again, aligns the expanded sealing ring and sends it to the upper edge of the housing mounting position, with the lower end face of the arc block 42 maintaining an axial gap of 0.5 to 1 mm with the upper edge of the mounting position.

[0040] Step S5: The axial drive component 45 drives the pusher sleeve 44 to move vertically downward along the cylindrical surface. The inner circumferential edge of the pusher sleeve 44 presses against the top surface of the sealing ring, evenly scraping and pushing the sealing ring off the outer wall of the cylindrical surface. The sealing ring smoothly falls into the installation position at the bottom of the housing thread. During this process, the Z-axis vertical lifting drive module 3 can simultaneously perform a small upward movement, the upward movement not exceeding the reserved axial clearance, to generate differential speed and reduce frictional impact. The limit stop 46 ensures that the lower end face of the pusher sleeve 44 does not contact the housing.

[0041] Step S6: The pusher sleeve 44 rises and resets under the action of the axial drive component 45; the micro cylinder of the power mechanism 43 reverses its action, the conical push block moves upward to release the self-locking, and the arc block 42 retracts inward to reset under the action of spring or gravity; the Z-axis module 3 and the lateral displacement component 2 return to the safe waiting position to prepare for the next cycle.

[0042] As a variation of this embodiment, the inner peripheral edge of the pusher sleeve 44 is a right-angled sharp edge. When the pusher sleeve 44 descends, this sharp edge directly presses against the inner edge of the top surface of the sealing ring, concentrating the force to push the sealing ring away from the cylindrical surface. The right-angled sharp edge is simple to process and low in cost, making it suitable for sealing rings made of harder materials. In another embodiment, the inner peripheral edge of the pusher sleeve 44 is provided with an inward annular protrusion. The lower surface of this protrusion is a plane. When pushing, the annular plane presses against the top surface of the sealing ring, increasing the pushing contact area and dispersing the pushing force, preventing indentations or damage to the top surface of the sealing ring. This is especially suitable for soft materials or sealing rings with strict appearance requirements. In another embodiment, the inner peripheral edge of the pusher sleeve 44 is a downwardly expanding conical transition structure. The small end of the conical surface is connected to the inner wall of the pusher sleeve 44, and the large end faces the sealing ring. When pushing the material, the conical surface first contacts the inner edge of the top surface of the sealing ring. Then, as the sleeve continues to descend, the conical surface gradually guides the sealing ring radially outward, so that the sealing ring is smoothly transitioned to the outer wall of the housing while leaving the cylindrical surface. This further reduces the vertical falling impact of the sealing ring at the moment of leaving the cylindrical surface and improves the stability of the landing.

[0043] In another embodiment of the power mechanism 43, a stepper motor is used in conjunction with a lead screw and nut mechanism to directly drive the axial movement of the conical push block. The stepper motor's rotation angle is precisely controlled by a controller, thereby accurately adjusting the radial expansion of the arc block to accommodate sealing rings with different inner diameters. In yet another embodiment, an electromagnet is used to push and pull the conical push block. When the electromagnet is energized, it pushes the conical push block to move and expand; when de-energized, it is driven to contract by a return spring. This structure is simple, has a fast response, and is suitable for small-sized sealing rings. In yet another embodiment, a cam mechanism is used. The cam is continuously rotated by a micro motor, and periodically drives a push rod through a contour curve to push the conical push block or directly drive the arc block to achieve radial movement. The cam curve can be designed to have three working stages: expansion, holding, and contraction, realizing a single-motor-driven full-motion process. In another embodiment, the power mechanism uses a miniature hydraulic cylinder in conjunction with a hydraulic pump station. The piston rod of the miniature hydraulic cylinder is connected to the conical push block. The hydraulic pump station supplies oil to the hydraulic cylinder through pipelines, pushing the conical push block to move axially. The hydraulic drive can provide a greater opening force, which is suitable for opening large-size or high-hardness seals. Moreover, the hydraulic system has good position holding capability and can lock at any position without the need for a self-locking conical surface, realizing stepless adjustment of the arc block expansion amount. One mechanism can adapt to the opening needs of seals of various specifications.

[0044] In another embodiment of the axial drive component 45, the drive component that drives the pusher sleeve 44 to slide axially along the cylindrical surface is not a cylinder, but a cam-linkage mechanism. This cam-linkage mechanism includes a rotating cam disk driven by a motor, a rocker arm with one end in contact with the cam profile, and a link connecting the other end of the rocker arm to the pusher sleeve 44. With one rotation of the cam disk, the pusher sleeve 44 completes one complete downward push and upward reset action. The cam profile can be designed with a rapid downward pressing section, a low-speed pushing section, and a rapid return section, thereby optimizing the matching relationship between the demolding force and demolding speed. This cam drive method does not rely on a compressed air source, making it suitable for use in fully electric automated production lines, and the push speed curve is uniquely determined by the cam shape, resulting in high reliability. In yet another embodiment, the axial drive of the pusher sleeve 44 uses a voice coil motor. The mover of the voice coil motor is directly connected to the upper end of the pusher sleeve 44, and the downward speed, thrust, and stroke of the pusher sleeve 44 are controlled by a controller applying a current waveform. The voice coil motor can adjust its output force in real time, forming a closed-loop force control with the force sensor. During the material ejection process, it accurately senses the force change the moment the sealing ring detaches from the cylindrical surface, thus precisely determining the demolding completion moment and stopping the ejection immediately to avoid over-ejection, further improving demolding success rate and product yield. In another embodiment, the axial drive component 45 can also be directly formed on the periphery of the ejector sleeve 44 using a rodless cylinder, making the overall structure more compact. The rodless cylinder slider is fixed to the outer wall of the ejector sleeve 44.

[0045] In another embodiment of the sealing ring opening and demolding assembly, the assembly is not composed of four independent quarter-circle blocks, but rather six independent sixth-circle blocks, each with a central angle of 60 degrees. Driven by a power mechanism, the six blocks synchronously expand outwards until they interlock, forming a complete cylindrical outer wall. Compared to the four-lobed structure, the six-lobed structure has a smaller outer diameter in its closed state, facilitating the insertion of sealing rings with smaller inner diameters. Simultaneously, during radial expansion, the six-lobed structure has denser contact points distributed along the circumference of each lobe, resulting in greater support continuity for the inner circumference of the sealing ring in the inter-lobe region, further reducing the possibility of slight suspended deformation between the lobes. In yet another embodiment, the sealing ring opening and demolding assembly consists of three independent arc blocks, each with a central angle of 120 degrees. These three arc blocks expand outwards and interlock to form a complete cylindrical surface. The three-lobed structure has fewer parts and a simpler mechanism, making it suitable for large-size sealing rings with relatively low assembly precision requirements. In the above multi-lobed structure, the power mechanism can still adopt the conical push block drive scheme, the difference being that the number of conical segments of the conical push block is matched with the number of arc blocks.

[0046] In another embodiment of the sealing ring feeding assembly 5, instead of using a combination of a linear vibrating feeder and a distributing cylinder, a rotary feeder is used. The rotary feeder includes a horizontal turntable driven by a stepper motor, with multiple sealing ring receiving slots evenly distributed along its circumference. The turntable rotates intermittently, feeding the sealing rings one by one to the picking position, which is located above the picking position of the demolding assembly. The rotary feeding structure can store multiple sealing rings and supply them continuously, eliminating the noise generated by linear vibration. In yet another embodiment, the feeding assembly includes a gravity feeding pipe and a picking position gate located at the bottom of the pipe; the sealing rings are stacked inside the gravity feeding pipe. During picking, the gate opens to release a single sealing ring to the picking position. This structure is simple, low-cost, and suitable for manual or semi-automatic workstations with low cycle time requirements.

[0047] To verify the beneficial effects of the present invention's technical solution compared to traditional expansion and demolding methods, comparative tests were conducted under the same experimental conditions. The tests used sealing rings of the same specification, employing both the traditional three-lobed metal expansion claw shrinkage demolding scheme and the four quarter-circular blocks and push-sleeve assembly scheme of this embodiment for expansion and demolding assembly. Multiple assembly tests were performed for each scheme, recording the misalignment rate and surface damage after sealing ring assembly. The results show that the traditional scheme, due to uneven suspended force caused by the gap between the lobes and frictional rebound during shrinkage demolding, has a high misalignment rate, and obvious dot-like indentations are visible on the sealing ring surface. The present application's solution, through continuous support across the entire circumference and uniform axial push-material, significantly reduces the misalignment rate and significantly improves surface damage. This comparative result confirms that, in the specific technical problem of elastic sealing ring assembly, the combination of full-circumference expansion and uniform axial push-material is not a simple superposition of two known methods, but rather produces a synergistic technical effect of reducing misalignment rate and surface damage.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A self-adaptive press-fitting device for a housing outer circumference sealing ring, comprising a base frame (1), a lateral displacement drive assembly (2), a Z-axis vertical lifting drive module (3), and a sealing ring opening and demolding assembly (4), characterized in that, The sealing ring opening demolding assembly (4) includes: Four separate quarter-circle blocks (42); The power mechanism (43) drives the four arc blocks (42) to expand and contract radially in sync; The pusher sleeve (44) has an annular cylindrical structure and is fitted around the cylindrical surface formed by the four arc blocks (42); An axial drive (45) is connected to the pusher sleeve (44) and drives it to slide axially. Among them, the four arc blocks (42) expand outward to form a complete cylindrical outer wall surface, and the pusher sleeve (44) can slide axially along the cylindrical surface under the drive of the axial drive member (45) to push the top surface of the sealing ring that is sleeved on the cylindrical surface, so that the sealing ring is detached from the cylindrical surface.

2. The apparatus according to claim 1, characterized in that, When the four arc blocks (42) are in an expanded state, the sides of adjacent arc blocks are joined together to form a complete cylindrical surface without gaps.

3. The apparatus according to claim 1, characterized in that, The power mechanism (43) includes a conical push block and a miniature cylinder that drives the conical push block to move axially. The outer conical surface of the conical push block cooperates with the inclined surface (421) of the inner wall of the four arc blocks (42) to convert the axial movement into the radial movement of the arc blocks. The cone angle of the outer conical surface of the conical push block is smaller than the self-locking friction angle.

4. The apparatus according to claim 1, characterized in that, The axial drive (45) is independent of the power mechanism (43).

5. The apparatus according to claim 4, characterized in that, It also includes a base (41) for mounting the axial drive (45) and the power mechanism (43), the base (41) being used to connect an external lifting drive device.

6. The apparatus according to claim 1, characterized in that, It also includes a limiting block (46) for limiting the downward stop of the pusher sleeve (44), so that the lower end face of the pusher sleeve (44) stops at a predetermined position after the sealing ring disengages from the cylindrical surface.

7. The apparatus according to claim 1, characterized in that, It also includes a sealing ring feeding assembly (5), located in front of the base frame (1), which includes a linear vibrating feeder (51) and a dispensing cylinder (52) for conveying individual sealing rings to the picking position.

8. The apparatus according to claim 1, characterized in that, It also includes a housing positioning base for securing the housing to be assembled.

9. The apparatus according to claim 1, characterized in that, When the Z-axis vertical lifting drive module (3) pushes the sealing ring downwards in the pusher sleeve (44), it simultaneously performs a slight upward movement.

10. The apparatus according to claim 1, characterized in that, The inner peripheral edge of the pusher sleeve (44) is a right-angled sharp edge or has an inwardly convex annular edge.

Images