A precise full-automatic wiper connector assembling device and assembling method

Abstract

A precise full-automatic assembling equipment and assembling method for a wiper connector, the assembling machine comprises a main machine cabinet frame assembly, a central rotating indexing turntable and multiple functional modules, wherein the inner sealing ring extrusion small group assembling module comprises an extrusion small platform and a strip-shaped groove thereon, an extrusion push block, a terminal limiting baffle, a hollow bearing hole, a cylindrical thin top column and a push lifting cylinder, a receiving cylinder, a lifting cylinder and a horizontal moving slide cylinder, and a pushing column body and a downward pressing power cylinder. The assembling method comprises the following steps: after the inner sealing ring is bidirectionally extruded and reduced in size at the end of the groove, the push block is withdrawn, the cylindrical thin top column penetrates through the hollow hole to lift the sealing ring, the sealing ring is taken out by the receiving cylinder and is kept in the reduced state by being constrained by a specific inner diameter, and after being transplanted to the shell station, the sealing ring is pushed out for assembly. The invention realizes a continuous action chain of sealing ring reduction-keeping-transplanting-release, separates the extrusion station and the assembly station in space, and helps to improve the flexibility of the layout of the multi-station equipment.

Description

Technical Field

[0001] This invention relates to the field of automated assembly equipment and methods, specifically to a precision fully automated assembly equipment and method for windshield wiper connectors. Background Technology

[0002] The wiper head is a key component connecting the wiper arm and the wiper blade. It usually requires an internal sealing ring to achieve a waterproof seal. The internal sealing ring is generally a ring-shaped elastic element made of rubber. Its outer diameter is slightly larger than the inner diameter of the sealing ring installation position inside the head housing in its natural state. During assembly, the sealing ring needs to undergo elastic deformation to reduce its outer diameter so that it can be installed inside the housing.

[0003] Currently, automated assembly of internal sealing rings typically employs a guide cone sleeve and pressure rod method. The sealing ring is first placed at the inlet of the guide cone sleeve above the housing. The pressure rod moves downwards, pushing the sealing ring down along the inner conical surface of the sleeve. Under the radial compression of the conical surface, the outer diameter of the sealing ring gradually decreases until it is finally pushed into its installation position within the housing. This method requires the extrusion and assembly of the sealing ring to be completed in the same station, with the ring directly pushed into the housing after extrusion.

[0004] The above method has the following drawbacks: the spatial coupling of extrusion and assembly limits the flexibility of equipment station layout. The sealing ring must be compressed and assembled immediately at the station where the housing is located, and it is impossible to transfer the compressed sealing ring to other stations for further assembly. When the housing is located at a station of a multi-station turntable, the extrusion mechanism and assembly mechanism of the sealing ring must be arranged above that station, resulting in a tight space at that station and easy interference with other functional modules. Summary of the Invention

[0005] The present invention aims to provide a precision fully automatic assembly equipment and method for wiper joints that can keep the extruded and shrunk sealing ring in a shrunk state and perform spatial transfer assembly, as well as an independently usable inner sealing ring extrusion assembly module.

[0006] According to one aspect of the present invention, a precision fully automatic assembly equipment for windshield wiper connectors is provided, comprising a main unit cabinet frame assembly, a central rotary indexing turntable tooling system, and multiple functional modules arranged circumferentially along the turntable. Among the multiple functional modules is an inner sealing ring extrusion assembly module, which includes: an extrusion platform with a strip-shaped groove on its upper surface, the strip-shaped groove having a beginning end and an end end; an extrusion pusher block slidably disposed within the strip-shaped groove, driven by an extrusion cylinder to push the inner sealing ring along the strip-shaped groove from the beginning end to the end end; an end limiting baffle fixedly disposed at the end of the strip-shaped groove; when the extrusion pusher block pushes the inner sealing ring to the end limiting baffle, the inner sealing ring is elastically deformed and its outer diameter is reduced by bidirectional compression between the extrusion pusher block and the end limiting baffle; after extrusion, the extrusion pusher block retracts in the direction away from the end, so that the reduced inner sealing ring is exposed in the bottom area of ​​the end of the strip-shaped groove; and a hollowed-out section. A bearing hole, located at the bottom of the end of the strip groove and in front of the end limiting baffle, supports the shrunken inner sealing ring above the hollow bearing hole. A cylindrical thin top column, coaxially positioned below the hollow bearing hole, is driven upward by a lifting cylinder to pass through the hollow bearing hole and lift the shrunken inner sealing ring upward. A receiving cylinder, coaxially positioned above the hollow bearing hole, has an inner diameter larger than the outer diameter of the inner sealing ring after compression and smaller than its original outer diameter before deformation. A lifting cylinder drives the receiving cylinder downward to take the inner sealing ring lifted by the cylindrical thin top column. After entering the receiving cylinder, the inner sealing ring is constrained circumferentially by its inner wall and remains in a shrunken state. A transverse sliding cylinder drives the receiving cylinder to move horizontally to the housing assembly position. A pusher column, coaxially slidably positioned inside the receiving cylinder, is driven downward by a pressing power cylinder to push the shrunken inner sealing ring out of the housing.

[0007] According to another aspect of the present invention, an inner sealing ring extrusion assembly module is provided, comprising: an extrusion platform having a strip-shaped groove on its upper surface, the strip-shaped groove having a beginning end and an end end; an extrusion pusher block slidably disposed within the strip-shaped groove for pushing the inner sealing ring along the strip-shaped groove from the beginning end to the end end; an end limiting baffle fixedly disposed at the end end of the strip-shaped groove, wherein when the extrusion pusher block pushes the inner sealing ring to the end limiting baffle, the inner sealing ring is elastically deformed and its outer diameter is reduced by bidirectional compression between the extrusion pusher block and the end limiting baffle; after extrusion is completed, the extrusion pusher block retracts in the direction away from the end end, so that the reduced inner sealing ring is exposed in the bottom region of the end end of the strip-shaped groove; and a hollow bearing hole is formed in the strip-shaped groove. At the bottom of the end, in front of the end limiting baffle, the shrunken inner sealing ring is supported above the hollowed-out bearing hole; a cylindrical thin top column is coaxially set below the hollowed-out bearing hole, used to push the shrunken inner sealing ring upward through the hollowed-out bearing hole; a receiving cylinder is coaxially set above the hollowed-out bearing hole, the inner diameter of the receiving cylinder is larger than the outer diameter of the inner sealing ring after being squeezed and shrunken but smaller than the original outer diameter of the inner sealing ring when it is not deformed, used to receive the lifted inner sealing ring and keep the inner sealing ring in a shrunken state after it enters due to the circumferential constraint of its inner wall; a pusher column is coaxially slidably set inside the receiving cylinder, used to move downward to push the inner sealing ring, which is kept in a shrunken state inside the receiving cylinder, into the housing.

[0008] According to another aspect of the present invention, a different precision fully automatic assembly equipment for wiper heads is provided, comprising a main unit cabinet frame assembly, a central rotary indexing turntable tooling system, and multiple functional modules arranged sequentially along the circumference of the turntable. The multiple functional modules include: a housing feeding module for automatically feeding wiper head housings onto the turntable tooling; the aforementioned inner sealing ring miniaturization assembly module for miniaturizing and assembling the inner sealing ring into the housing; a sealing ring height detection module for detecting the assembly height of the inner sealing ring; a sealing ring lubrication module for applying lubricating grease to the inner sealing ring; an automatic latch assembly module for pressing the latch into the housing slot; and a latch assembly detection and finished product unloading module for detecting whether the latch is properly assembled and automatically unloading the assembled wiper head finished product.

[0009] In the aforementioned assembly machine, the inner sealing ring extrusion assembly module can be installed on an independent frame and docked with the sealing ring assembly station of the central rotary indexing turntable tooling system, thus becoming a modular unit integrated into the whole machine. The sealing ring elastically shrinks due to bidirectional extrusion formed by the extrusion pusher and the end limiting baffle at the end of the strip groove. After the extrusion pusher retracts, the cylindrical thin top column lifts the sealing ring upwards. The receiving cylinder descends to catch the sealing ring and uses its inner diameter constraint to maintain its shrunken state. The transverse slide cylinder transfers the cylinder to the housing station, and the pushing column pushes the sealing ring out and releases it into the housing, thus realizing a complete assembly action chain of sealing ring shrinkage-holding-transfer-release.

[0010] After the sealing ring is released from the extrusion pusher and the end limiting baffle, the inner wall of the receiving cylinder provides circumferential constraint, limiting its elastic recovery. This allows it to be horizontally transferred to the housing assembly station by the transverse slide cylinder while remaining in its reduced state. This spatial separation of the extrusion reduction station and the assembly station solves the spatial limitation of traditional methods where extrusion and assembly must be completed at the same station, thus improving the flexibility of the multi-station turntable equipment's station layout.

[0011] In the aforementioned assembly machine or module, the centerline of the hollow bearing hole can be 0.5 to 0.8 times the original outer diameter of the inner sealing ring from the inner side of the end limiting baffle, ensuring that the center of the sealing ring is aligned with the lifting channel. The lower end face of the receiving cylinder can be machined with an introductory chamfer, and the inner wall has an axially extending venting groove to alleviate the vacuum adsorption effect. Reinforcing ribs symmetrically arranged along the direction of the strip groove can be provided below the extrusion platform to compensate for the localized strength reduction caused by the hollow hole. The end limiting baffle can be integrally formed with the extrusion platform or rigidly fixed by fasteners, and its working surface remains perpendicular to the bottom surface of the groove. The retraction action of the extrusion pusher can be achieved by a double-acting cylinder, a single-acting spring return cylinder, or an independent auxiliary retraction cylinder. The inner wall of the receiving cylinder can also be provided with an elastic coating, an annular step, or an annular groove to further enhance the reliability of maintaining the sealing ring in a reduced state.

[0012] According to another aspect of the present invention, a method for assembling a wiper joint is provided, comprising the following steps: pushing an inner sealing ring to the beginning of a strip-shaped groove formed on a squeezing platform; driving a squeezing pusher block driven by a squeezing cylinder to push the inner sealing ring along the strip-shaped groove to an end limiting baffle fixedly disposed at the end of the groove, so that the inner sealing ring is compressed in both directions and elastically deformed to reduce its outer diameter; after the squeezing is completed, the squeezing pusher block retracts in the direction away from the end, so that the reduced inner sealing ring is exposed above the hollow bearing hole formed at the bottom of the end of the groove; driving a circular... A cylindrical slender top column passes upward through a hollowed-out bearing hole, lifting the shrunken inner sealing ring. A receiving cylinder, driven by a lifting cylinder, descends to collect the lifted inner sealing ring. The inner diameter of the receiving cylinder, being larger than the shrunken outer diameter but smaller than the original outer diameter, ensures the inner sealing ring remains shrunken due to circumferential constraint from the inner wall. A horizontal sliding cylinder drives the receiving cylinder carrying the inner sealing ring to move horizontally to the housing assembly position. A downward pressing cylinder drives a pushing column to move downward within the receiving cylinder, pushing the shrunken inner sealing ring out into the housing. Preferably, before horizontally moving the receiving cylinder, the lifting cylinder is first raised to a safe height above the top of the cylindrical slender top column.

[0013] The wiper joint precision fully automatic assembly equipment, inner sealing ring extrusion assembly module, and assembly method provided by this invention utilize a bidirectional extrusion process formed by an end-limiting baffle and an extrusion pusher at the end of a strip-shaped groove to elastically shrink the sealing ring. After the pusher retracts, a cylindrical thin top column lifts the sealing ring, and a receiving cylinder with a specially defined inner diameter is used to pick up the sealing ring and maintain its shrunken state with circumferential constraints. Finally, a transverse sliding cylinder transfers the sealing ring to the housing station and pushes it out for assembly. This continuous chain of actions—shrinking, retraction, lifting, picking up, constraining, transferring, and pushing out—allows the sealing ring to maintain its shrunken state for spatial transfer even after leaving the extrusion station. This solves the spatial limitation of traditional methods where extrusion and assembly must be completed at the same station, improving the flexibility of the multi-station turntable equipment's station layout.

[0014] By integrating the strip groove, end limiting baffle, and hollow bearing hole into a three-dimensional extrusion platform, the three consecutive actions of horizontal pushing of the sealing ring, extrusion shrinking, and vertical lifting are completed in the same spatial position. This reduces intermediate steps in inter-station transfers and the number of positioning reference changes, helping to improve assembly cycle time and repeatability accuracy. Simultaneously, reinforcing ribs compensate for the weakening of the platform's strength caused by the hollow hole, and venting grooves on the inner wall of the barrel alleviate vacuum adsorption, further ensuring the reliability and smoothness of the mechanism under long-term, high-frequency operation. The combination of these structures and steps is not a simple superposition, but rather produces a synergistic and efficient technical effect. Attached Figure Description

[0015] 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.

[0016] Figure 1 This is a top view of the precision fully automatic assembly equipment for wiper connectors in this embodiment of the invention, used to show the overall distribution of each functional module on the machine.

[0017] Figure 2 This is a slant view of the overall appearance of the precision fully automatic assembly equipment for windshield wiper connectors in this embodiment of the invention, showing the main cabinet and frame structure of the equipment.

[0018] Figure 3 yes Figure 2 The top-view plan of the assembly machine clearly shows the central rotary indexing turntable tooling system and the relative positions of each module and the turntable.

[0019] Figure 4This is an independent three-dimensional structural view of the inner sealing ring extrusion assembly module in an embodiment of the present invention, showing the overall installation form of the module on an independent frame.

[0020] Figure 5 yes Figure 4 An enlarged view of the partial FD area of ​​the inner sealing ring extrusion assembly module shows in detail the fit and relationship of core components such as the strip groove, the extrusion push block, the end limit baffle, the hollow bearing hole, the cylindrical thin top column, and the receiving cylinder.

[0021] The following are the labels in the attached diagram: 100 Shell feeding module, 200 Inner sealing ring extrusion assembly module, 210 Extrusion platform, 211 Strip groove, 220 Extrusion pusher block, 221 Extrusion cylinder, 230 End limit baffle, 240 Cylindrical thin top column, 241 Pushing cylinder, 250 Material receiving cylinder, 261 Lifting cylinder, 262 Horizontal slide cylinder, 270 Pushing column, 271 Downward pressing power cylinder, 280 Independent frame, 300 Sealing ring height detection module, 400 Sealing ring oiling module, 500 Automatic buckle assembly module, 600 Buckle assembly inspection and finished product unloading module, 700 Central rotary indexing turntable tooling system. Detailed Implementation Example 1

[0022] This embodiment provides a precision fully automatic assembly equipment for windshield wiper connectors and its core functional module—the inner sealing ring extrusion assembly module 200, as well as the corresponding assembly method. Figures 2 to 4 The overall structure of the assembly machine is shown from different perspectives. Figure 1 The complete mechanical structure of the inner sealing ring extrusion assembly module 200 is shown separately.

[0023] Reference Figure 2 The assembly machine includes a main unit cabinet frame assembly, with a sheet metal enclosed cabinet base at its bottom. The cabinet base houses the pneumatic valve island, PLC control box, air source treatment unit, and lubrication supply unit. The sides of the cabinet base feature maintenance doors and ventilation louvers. The bottom of the cabinet base is equipped with lockable swivel casters and four sets of leveling feet for easy equipment relocation and leveling of the production surface. A single, thickened machined steel plate serves as the equipment mounting panel on top of the cabinet base, acting as the mounting reference platform for all modules, turntables, and cylinder slides.

[0024] Reference Figure 2 and Figure 3The core transfer mechanism of the assembly machine is the central rotary indexing turntable tooling system 700. This turntable system 700 employs a multi-station segmented rotary turntable with multiple tooling fixture stations evenly distributed in a ring to support the wiper head housing. The turntable is driven by a cam divider and a servo motor, achieving precise intermittent indexing to ensure accurate positioning of the housing tooling at each assembly station. Multiple sets of dedicated fixtures arranged on the turntable are used to clamp and position the wiper head housing, and are equipped with positioning cylinders and error-proof detection sensors.

[0025] Along the circumference of the turntable, the following functional modules are arranged in sequence according to the turntable's rotation order: housing feeding module 100, inner sealing ring extrusion assembly module 200, sealing ring height detection module 300, sealing ring oiling module 400, lock automatic assembly module 500, and lock assembly detection and finished product unloading module 600.

[0026] The housing feeding module 100 includes an external independent vibratory plate and a linear feeding vibration plate, which orderly transports the wiper connector housing to the turntable fixture. It is equipped with a material distribution cylinder, a material presence / absence photoelectric sensor, and a positioning and blocking mechanism to realize automatic feeding, distribution, and positioning of the housing.

[0027] The sealing ring height detection module 300 is a vertical inspection and assembly unit, including a vertical lifting slide, a displacement laser sensor or a contact height sensor, a detection cylinder, and a good / bad product signal output module. After the sealing ring is assembled, the sensor, driven by the detection cylinder, presses down to detect the assembly height of the sealing ring, determining whether the sealing ring is assembled correctly and whether there are any omissions.

[0028] The sealing ring oiling module 400 integrates a micro-oil supply system, an oiling needle, an XYZ fine-tuning slide, and an oiling lifting cylinder to automatically and quantitatively apply lubricating grease to the assembled inner sealing ring to ensure the smooth operation of the joint product.

[0029] The 500 automatic buckle assembly module is equipped with an independent buckle vibratory feeder, a material distribution and positioning cylinder, and a buckle pressing cylinder. It automatically transports the buckle parts and presses the buckles into the corresponding slots in the wiper head housing.

[0030] The latch assembly inspection and finished product unloading module 600 includes a latch positioning detection unit and a finished product unloading and transfer mechanism. The latch positioning detection unit includes a photoelectric sensor or proximity sensor and a pressure detection head to detect whether the latch is properly pressed in, whether there is missing material, and whether it is floating improperly. The finished product unloading and transfer mechanism includes a linear transfer slide, a gripper cylinder, a good product unloading slide, and a material box. After the turntable rotates to the final station, the gripper cylinder picks up the assembled wiper head and automatically unloads and collects it.

[0031] The assembly machine is equipped with three sets of vibratory feeder systems, corresponding to the housing, inner sealing ring, and locking buckle parts, respectively. Each set of vibratory feeder systems includes a vibratory hopper, a linear feeder, a material channel blocking and distribution cylinder, and a material shortage alarm sensor.

[0032] All pushing, lifting, traversing, squeezing, and pressing actions of the assembly machine are driven by cylinders. The cabinet houses a pneumatic valve island, air source filter pressure regulating valve, and oil-water lubrication components, forming a complete pneumatic actuator system. The electrical control system includes a built-in PLC main controller, servo drivers, sensor signal modules, and a human-machine interface touchscreen. The machine's automation logic, turntable indexing, cylinder timing, detection judgment, and alarm output are all uniformly controlled by the electrical control system. The machine is also equipped with photoelectric material presence / absence sensors, proximity switches, height displacement detection sensors, and limit switches, forming a sensor detection system that enables automatic identification and alarms for material shortages, omissions, and assembly defects throughout the entire process.

[0033] The following describes in detail the specific structure of the core functional module in the assembly machine—the inner sealing ring extrusion assembly module 200, and the assembly method implemented using this module.

[0034] Reference Figure 1 The inner sealing ring extrusion assembly module 200 is a complete modular independent mechanism, all integrated on an independent frame 280, and docks in a modular form with the sealing ring assembly station of the central rotary indexing turntable tooling system 700 of the assembly machine. The module 200 includes a sealing ring vibration feeding mechanism, a dispensing cylinder, a sealing ring extrusion mechanism, a bottom lifting unit, a material cylinder transfer mechanism, and a material cylinder pushing assembly unit.

[0035] The sealing ring vibration feeding mechanism includes a small vibratory plate and a vibration feeding channel, which is used to realize the disordered automatic sorting and feeding of the inner sealing rings, and to transport the sealing rings one by one forward along the vibration feeding channel to the end of the channel.

[0036] The material distribution cylinder is a single-acting pneumatic material distribution pusher, installed at the end of the vibrating feeding channel, used to separate the sealing rings at the end of the channel individually and push them to the beginning of the strip groove 211 of the sealing ring squeezing mechanism.

[0037] The sealing ring extrusion mechanism includes an extrusion platform 210. A strip-shaped groove 211 is formed on the upper surface of the extrusion platform 210. The groove 211 has a beginning and an end, with its beginning adjacent to the end of the vibrating feeding channel. The groove 211 has a rectangular cross-section, with a width 1.05 to 1.2 times the original outer diameter of the inner sealing ring, allowing the sealing ring to slide freely within the groove along the pushing direction. Simultaneously, the groove walls restrict the sealing ring from flipping or deflecting during pushing. The groove depth is 0.6 to 1.0 times the cross-sectional diameter of the inner sealing ring, ensuring that the sealing ring does not detach from the groove during pushing. The surface roughness Ra of each surface of the groove 211 is no greater than 1.6 μm to reduce pushing frictional resistance.

[0038] The small extrusion pusher 220 is slidably disposed within the strip-shaped groove 211, and is driven by the small extrusion cylinder 221 to push the inner sealing ring along the groove 211 from the beginning to the end. The cylinder body of the small extrusion cylinder 221 is fixedly mounted on the side of the small extrusion platform 210 by an L-shaped bracket, and the bracket is bolted to the platform 210. The piston rod axis of the small extrusion cylinder 221 is parallel to the center line of the groove 211, and the small extrusion pusher 220 is fixed to the end of the piston rod by a threaded connection.

[0039] The end-limiting baffle 230 is fixedly installed at the end of the strip groove 211. When the extrusion pusher 220 pushes the inner sealing ring to the end-limiting baffle 230, the inner sealing ring is elastically deformed and its outer diameter is reduced due to bidirectional compression by the extrusion pusher 220 and the end-limiting baffle 230. The end-limiting baffle 230 is made of Cr12 mold steel, and its working surface facing the groove 211 is ground to a flatness of no more than 0.01 mm to ensure uniform force on the sealing ring during extrusion. The end-limiting baffle 230 can be rigidly fixed to the extrusion platform 210 by screws or integrally formed with the extrusion platform 210. The integrally formed structure has higher positioning accuracy and structural rigidity, while the fastener connection method facilitates the replacement and maintenance of the baffle. Regardless of the fixing method, the working surface of the end-limiting baffle 230 remains perpendicular to the bottom surface of the strip groove 211, ensuring uniform force on the sealing ring during extrusion and avoiding excessive compression or uneven deformation of the sealing ring on one side due to baffle tilt.

[0040] After extrusion, the small extrusion pusher 220 retracts a predetermined distance away from the end, exposing the shrunken inner sealing ring at the bottom of the end of the strip groove 211. The retraction of the small extrusion pusher 220 can be driven by the small extrusion cylinder 221 in a double-acting cylinder configuration, automatically by the small extrusion cylinder 221 in a single-acting spring-returning cylinder configuration, or driven by an auxiliary retraction cylinder independent of the small extrusion cylinder 221. The retraction action causes the small extrusion pusher 220 to move away from above the sealing ring, exposing the bottom area of ​​the sealing ring for subsequent lifting operations.

[0041] A hollowed-out bearing hole is provided at the bottom of the end of the strip-shaped groove 211. This hollowed-out bearing hole is located in front of the end limiting baffle 230, that is, inside the groove 211 rather than behind the baffle 230. The center line of the hollowed-out bearing hole is 0.5 to 0.8 times the original outer diameter of the inner sealing ring from the inner side of the end limiting baffle 230, so that the center of the inner sealing ring pushed to the baffle 230 is exactly above the center of the hollowed-out bearing hole. The shrunken inner sealing ring is supported above the hollowed-out bearing hole, waiting to be lifted. The inner diameter of the hollowed-out bearing hole is larger than the outer diameter of the shrunken sealing ring but smaller than the original outer diameter of the sealing ring, so that the unshrunken sealing ring will not fall out of the hole, while the shrunken sealing ring can be effectively supported by the lifting component below.

[0042] It should be noted that when the inner sealing ring is compressed radially in both directions by the small pusher 220 and the end limiting baffle 230 within the strip groove 211, its elastic deformation does not uniformly shrink into a regular circle with a smaller diameter. Due to the concentrated extrusion force along a specific direction, the sealing ring is flattened in that direction and extends outwards in the direction perpendicular to the extrusion direction due to material volume conservation, resulting in an overall outline that is approximately elliptical, waist-shaped, or other irregular. Specifically, the radial dimension of the sealing ring in the extrusion direction is significantly reduced, potentially smaller than the inner diameter of the hollowed-out bearing hole; while the dimension perpendicular to the extrusion direction may increase, and this increased dimension is usually still larger than the inner diameter of the hollowed-out bearing hole, and may even be close to or slightly larger than the original outer diameter of the sealing ring. The groove width of the strip groove 211 is 1.05 to 1.2 times the original outer diameter of the sealing ring, providing sufficient space to accommodate the aforementioned extension deformation.

[0043] Based on the aforementioned deformation characteristics, although the inner diameter of the hollow bearing hole is larger than the reduced size of the sealing ring in the compression direction, the outer contour of the sealing ring in the extension direction (such as the end of the waist-shaped long shaft) can overlap and rest on the edge of the hollow bearing hole, thus stably supporting it above the hole and preventing it from falling out. This bearing state is reliable and certain, providing a clear basis for subsequent jacking operations.

[0044] When the lifting cylinder 241 drives the cylindrical thin pusher 240 upward through the hollow bearing hole, the top of the pusher first contacts the bottom of the sealing ring. Since the diameter of the cylindrical thin pusher 240 is smaller than the inner diameter of the hollow bearing hole, and the sealing ring is subjected to an upward pushing force, the sealing ring undergoes secondary elastic deformation, and its outer contour adapts to change shape to pass through the hollow bearing hole. Specifically, the lifting force of the pusher further forces the size of the sealing ring in the extrusion direction to decrease, or causes the sealing ring to twist or tilt, etc., which are shape adjustments that facilitate passage through the hole. Finally, the sealing ring is completely pushed upward out of the hollow bearing hole and enters the receiving cylinder (250) above. This process is achieved entirely by utilizing the elastic deformation characteristics of the sealing ring itself, without the need for additional mechanisms.

[0045] To facilitate understanding, an illustrative example is given: Assume the original outer diameter of the inner sealing ring is 20mm. After being compressed, its dimension in the compression direction shrinks to approximately 6mm, while the dimension perpendicular to the compression direction extends to approximately 22mm. If the inner diameter of the hollow bearing hole is set to 8mm, then the sealing ring's dimension in the compression direction (6mm) is smaller than the hole's inner diameter (8mm), but its dimension in the extension direction (22mm) is much larger than the hole's inner diameter. Therefore, the sealing ring cannot pass through the hole entirely; its long axis ends reliably overlap the hole's edge. During lifting, the jack (with a diameter of 6mm) pushes the sealing ring, and under the thrust, the sealing ring's compression direction shrinks again, adapting its shape, thus allowing it to disengage smoothly. This example is only for illustrating the principle and does not constitute a limitation on actual dimensions.

[0046] The bottom lifting unit is located below the extrusion platform 210. This unit includes a lifting cylinder 241 and a cylindrical thin lifting column 240. The lifting cylinder 241 is fixed to the underside of the extrusion platform 210 by a cylinder mounting plate. An adjusting shim is provided between the mounting plate and the lower surface of the platform 210 to calibrate the coaxiality of the cylinder piston rod and the hollow bearing hole. The lifting cylinder 241 is equipped with a magnetic switch to detect the piston position and has an upper stroke limit screw to precisely control the lifting height. The cylindrical thin lifting column 240 is coaxially positioned directly below the hollow bearing hole, and its lower end is fixed to the piston rod of the lifting cylinder 241 by a threaded connection. When the cylindrical thin lifting column 240 passes upward through the hollow bearing hole, it pushes the reduced inner sealing ring upward.

[0047] The material cylinder transfer mechanism is located above the extrusion platform 210 and is used to receive the lifted sealing rings and transfer them to the housing assembly station. The mechanism includes a receiving material cylinder 250, a lifting cylinder 261, and a transverse slide cylinder 262.

[0048] The receiving cylinder 250 is a hollow tubular structure extending vertically, made of stainless steel. Its inner wall is honed, with a surface roughness Ra not exceeding 0.4 μm to reduce frictional resistance when the sealing ring slides within the cylinder. The receiving cylinder 250 is coaxially positioned above the hollowed-out bearing hole. Its inner diameter is larger than the outer diameter of the inner sealing ring after compression but smaller than its original, undeformed outer diameter. This inner diameter constraint prevents the sealing ring from freely and elastically recovering after entering the cylinder 250, thus maintaining its compressed state even after being released from the compression of the extrusion pusher 220 and the end limiting baffle 230.

[0049] The lower end face of the receiving cylinder 250 is machined with an introductory chamfer, the chamfer size being C0.5 to C1, to facilitate guiding the sealing ring into the cylinder 250 during the downward retrieval process. The inner wall of the receiving cylinder 250 also has multiple axially extending micro-venting grooves. The depth and width of the venting grooves are limited to not significantly weakening the constraint force of the cylinder's inner wall on the sealing ring. When the sealing ring is pushed downwards by the pusher column within the cylinder 250, the venting grooves provide a channel for air to escape below the sealing ring, alleviating the vacuum adsorption effect caused by the tight fit between the sealing ring and the cylinder's inner wall, thus helping to improve the smoothness and reliability of the pushing action.

[0050] The guide rail base of the transverse slide cylinder 262 is bolted to the top plate of the module independent frame 280, forming the horizontal movement foundation of the entire cylinder transfer mechanism. The cylinder body of the lifting cylinder 261 is fixedly installed on the slide of the transverse slide cylinder 262 via an adapter plate. A positioning pin is provided between the adapter plate and the slide to ensure installation accuracy. The receiving cylinder 250 is fixedly installed on the piston rod end of the lifting cylinder 261 via a clamp-type fixture. The clamp allows for fine adjustments in multiple directions to calibrate the coaxiality of the cylinder 250 and the cylindrical thin top column 240.

[0051] During operation, the transverse slide cylinder 262 drives the lifting cylinder 261 and the receiving cylinder 250 to move horizontally as a whole, switching the position of the cylinder 250 between above the hollow bearing hole and above the housing assembly station. When the cylinder 250 is above the hollow bearing hole, the lifting cylinder 261 drives the receiving cylinder 250 to descend independently and take the sealing ring lifted by the cylindrical thin top post 240. After taking the ring, the lifting cylinder 261 drives the cylinder 250 to rise and reset to a safe height where the lower end of the cylinder 250 is higher than the top of the cylindrical thin top post 240. The transverse slide cylinder 262 then horizontally transfers the cylinder 250 carrying the sealing ring to directly above the housing tooling fixture on the turntable. The housing fixture is provided with a guide hole for the material cylinder. When the material cylinder 250 reaches the top of the housing fixture, the lower end of the material cylinder 250 can be inserted into the guide hole to achieve precise positioning. The fit clearance between the guide hole and the outer diameter of the material cylinder is H7 / g6, which ensures the alignment accuracy while allowing the material cylinder to be smoothly inserted and withdrawn.

[0052] The material feeding assembly unit includes a feeding column 270 and a pressing cylinder 271. The feeding column 270 is coaxially slidably disposed inside the receiving cylinder 250, with its outer diameter slightly smaller than the inner diameter of the cylinder 250, leaving a clearance fit between them. The feeding column 270 has a stepped shaft structure, with the larger diameter section at the upper end connected to the piston rod of the pressing cylinder 271, and the smaller diameter section at the lower end clearance-fitted with the inner diameter of the cylinder 250. The pressing cylinder 271 is fixed on a mounting bracket coaxial with the cylinder 250, and the mounting bracket is fixed to the slide of the transverse slide cylinder 262 or the adapter plate of the lifting cylinder 261, so that the pressing cylinder 271, the feeding column 270, and the cylinder 250 maintain a constant relative position during transverse movement.

[0053] The lower end face of the pusher column 270 is machined with an annular shallow groove that matches the cross-sectional shape of the inner sealing ring. The groove depth is 0.5 to 1 mm to ensure that the sealing ring is centered during push and does not deviate.

[0054] After the transverse slide cylinder 262 moves the material cylinder 250 directly above the housing fixture and completes the alignment, the downward pressure cylinder 271 drives the pusher column 270 to move downward. The lower end face of the pusher column 270 contacts the upper surface of the sealing ring inside the material cylinder 250, pushing it downward. After the sealing ring is pushed out of the lower port of the material cylinder 250, it loses the circumferential constraint of the inner wall of the material cylinder and returns to its original outer diameter or close to its original outer diameter under its own elastic action, and is inserted into the sealing ring mounting groove inside the housing, completing the assembly of the sealing ring.

[0055] The complete assembly method of this embodiment is as follows: the sealing ring is conveyed to the end of the material channel by the sealing ring vibration feeding mechanism through the vibration feeding channel; the distributing cylinder pushes the sealing rings individually to the beginning of the strip groove 211 at the end of the material channel; the extrusion cylinder 221 drives the extrusion pusher 220 to push the sealing ring to the end limiting baffle 230 along the groove 211, and the extrusion pusher 220 and the baffle 230 squeeze each other in both directions to make the sealing ring elastically deform and reduce its outer diameter; the extrusion pusher 220 retracts, exposing the bottom of the sealing ring; the lifting cylinder 241 drives the cylindrical thin top column 240 to pass upward through the hollow bearing hole and lift the sealing ring upward. The lifting cylinder 261 drives the receiving cylinder 250 to descend, taking the lifted sealing ring. After entering the cylinder 250, the sealing ring is constrained by the inner wall and remains in a reduced state. The cylindrical thin top column 240 descends to reset. The lifting cylinder 261 drives the cylinder 250 to rise and reset to a safe height above the top of the cylindrical thin top column 240. The horizontal sliding cylinder 262 drives the cylinder 250 to move horizontally to the sealing ring assembly station. The downward pressing power cylinder 271 drives the pushing column 270 to move downward, pushing the sealing ring, which remains in a reduced state in the cylinder 250, into the housing. The sealing ring elastically recovers and snaps into the mounting groove. Example 2

[0056] This embodiment describes several alternative implementations and optimized variations of the inner sealing ring extrusion small assembly module 200 and the assembly method.

[0057] Regarding the adjustment of the extrusion deformation between the extrusion pusher 220 and the end limit baffle 230, an adjustable hard limit device can be installed at the end of the stroke of the extrusion cylinder 221. The hard limit device includes an adjusting screw and a locking nut. By rotating the adjusting screw, the distance between the end position of the extrusion pusher 220 and the end limit baffle 230 is changed, thereby controlling the amount of extrusion deformation of the sealing ring. This adjustable design allows for targeted optimization of the deformation amount based on the differences in material elasticity or temperature conditions between different batches of sealing rings, ensuring sufficient shrinkage effect within the elastic limit range.

[0058] Regarding the surface treatment of the inner wall of the groove 211, a Teflon coating can be applied. The Teflon coating reduces the coefficient of friction between the sealing ring's rubber material and the metal wall, preventing the sealing ring from sticking or experiencing surface wear during the pushing process. Alternatively, the inner wall of the groove 211 can be hard chrome plated. The hard chrome plating increases the surface hardness of the groove, extending the platform's service life during long-term, high-frequency pushing operations. The Teflon coating option focuses on reducing friction and is suitable for scenarios requiring high surface quality of the sealing ring; the hard chrome plating option focuses on improving wear resistance and is suitable for high-volume, continuous production scenarios.

[0059] Regarding the inner wall treatment of the receiving cylinder 250, in addition to the venting groove described in Example 1, the inner wall can also be microtextured. Microtexturing, by forming micron-level uneven textures on the inner wall of the cylinder, retains the circumferential constraint capability of the sealing ring while reducing the actual contact area between the sealing ring and the inner wall, thereby reducing frictional resistance during material feeding. It can be used in conjunction with the venting groove or alone.

[0060] Regarding the venting structure of the inner wall of the receiving cylinder 250, in addition to machining venting grooves on the inner wall of the cylinder, several radial through holes can also be opened on the side wall of the cylinder 250 as venting ports. The venting ports are arranged at intervals along the axial direction of the cylinder. During the process of the sealing ring being pushed out, the air below the sealing ring can be directly discharged to the outside of the cylinder through the venting ports. This method is simpler to process, but it is necessary to control the diameter of the venting ports to avoid the sealing ring being partially squeezed into the holes when passing through the venting port positions.

[0061] Regarding the shape of the lower end face of the pusher column 270, in addition to the annular shallow groove described in Example 1, the lower end face of the pusher column 270 can also adopt a planar structure. Planar structures are simple to process and are suitable for O-rings with relatively regular cross-sectional shapes. When the cross-sectional shape of the sealing ring is non-circular, such as an X-ring or a square cross-section sealing ring, a specific shape end face adapted to its cross-sectional shape can be selected to ensure uniform force on the sealing ring during the pushing process.

[0062] Regarding the connection between the beginning of groove 211 and the end of the vibrating feeding channel, the beginning of groove 211 may be provided with a flared guide slope. The expansion angle of this guide slope is 15 to 30 degrees, which is used to compensate for the alignment deviation between the pushing direction of the distributing cylinder and the orientation of groove 211, and guide the sealing ring smoothly from the end of the vibrating feeding channel into the beginning of groove 211, reducing the risk of material jamming caused by alignment deviation.

[0063] Regarding the connection between the beginning of groove 211 and the end of the vibrating feeding channel, as an alternative or supplementary solution, a transition guide plate can be installed between the beginning of groove 211 and the end of the vibrating feeding channel. The upper surface of the transition guide plate is flush with the bottom surface of groove 211, and one edge of the transition guide plate is aligned with one side wall of groove 211, forming an extended guide surface, so that the auxiliary sealing ring can be laterally limited in advance during the pushing process of the distributing cylinder. Example 3

[0064] This embodiment describes further alternative implementations of the inner sealing ring extrusion small assembly module 200 and the assembly method, as well as a retreat path-specific variant and a bypass defense variant.

[0065] Regarding the retraction method of the extrusion pusher 220, as an alternative, the extrusion cylinder 221 can also adopt a single-acting cylinder structure with a built-in return spring. In this scheme, the forward movement of the extrusion cylinder 221, i.e., pushing the sealing ring, is driven by compressed air. When the air source is cut off or the reversing valve switches to the exhaust position, the return spring inside the cylinder pushes the piston to reset, thereby driving the extrusion pusher 220 to automatically retract. This scheme simplifies the pneumatic control circuit, eliminating the need for a separate control valve for the retraction action and reducing the complexity of the control system. As another alternative, the retraction action of the extrusion pusher 220 can also be achieved by an auxiliary retraction cylinder independent of the extrusion cylinder 221, distributing the forward and retraction actions to two independent cylinders, allowing for separate adjustment of the forward thrust and retraction speed.

[0066] Regarding the top structure of the cylindrical thin top post 240, as an alternative, the top of the cylindrical thin top post 240 can be machined into a flat structure, directly contacting and lifting the annular solid portion of the sealing ring. This solution has the simplest structure and is suitable for scenarios where the outer diameter of the top post and the inner diameter of the sealed ring after reduction are appropriately matched.

[0067] Regarding the horizontal transfer drive method for the receiving cylinder 250, as an alternative, the lateral movement drive function can be implemented using a servo motor in conjunction with a lead screw module. The servo motor drives the lead screw to rotate, causing the slide table and cylinder 250 to move horizontally along the guide rail to the housing assembly station. Compared with cylinder drive, the servo lead screw module has the advantages of high position controllability, arbitrary stopping at intermediate positions, and programmable adjustment of movement speed. As another alternative, the lateral movement drive function can also be implemented using a rodless cylinder. The axial space occupied by the rodless cylinder is smaller than that of the traditional rod cylinder, which can further reduce the horizontal dimension of the module.

[0068] Regarding the constraint structure of the sealing ring on the inner wall of the receiving barrel 250, the following retreat variants are provided to further enhance the reliability of the sealing ring in maintaining its shrunken state. Retreat Variant A: The inner wall of the barrel 250 is coated with an elastic coating. The material of the elastic coating can be polyurethane or silicone rubber. When the sealing ring enters the barrel 250, the elastic coating undergoes slight compression deformation under the elastic restoring force of the sealing ring, increasing the contact area and friction between the coating and the sealing ring. Retreat Variant B: The inner wall of the barrel 250 has an inwardly protruding annular step or at least three circumferentially spaced protrusions in the section near the lower port. The diameter of the inscribed circle of the annular step or protrusions is between the outer diameter of the shrunken sealing ring and its original outer diameter. Variant C: The inner wall of the barrel 250 has at least one circumferentially extending annular groove machined in the sealing ring receiving section. When the sealing ring is pushed downward by the pusher column 270 within the barrel 250, the outer periphery of the sealing ring partially embeds into the annular groove, generating an additional mechanical locking effect. When the pushing force exceeds this resistance threshold, the sealing ring can disengage from the groove and continue moving downward. The groove depth should be selected such that the axial disengagement resistance generated after the outer periphery of the sealing ring is embedded in the groove is greater than the maximum inertial force or vibration force that the sealing ring may experience during lateral movement, and less than the rated thrust of the downward pressing power cylinder 271. The groove depth can be one-tenth to one-fifth of the barrel wall thickness, or five percent to fifteen percent of the sealing ring cross-sectional diameter.

[0069] Regarding defensive variants of the end-positioning baffle 230, defensive variant A: The working surface of the end-positioning baffle 230, i.e., the side facing the small extrusion pusher 220, is machined with at least one vertically extending groove or corrugated texture to increase the static friction between the baffle 230 and the sealing ring. Defensive variant B: At least one locating pin or boss protruding towards the small extrusion pusher 220 is fixed or integrally formed on the working surface of the end-positioning baffle 230. When the sealing ring is pushed to the baffle 230, the locating pin or boss inserts into the center hole or side locating structure of the sealing ring to assist in positioning the sealing ring.

[0070] Regarding the integrated processing variant of the hollowed-out bearing hole and the strip groove 211, the extrusion platform 210 can be formed by stacking and fixing an upper plate and a lower plate. The upper surface of the upper plate is machined with the strip groove 211, and the lower surface of the upper plate is machined with a transverse groove with a semi-circular or rectangular cross-section at the corresponding position on the lower plate. The upper surface of the lower plate is flat. When the upper plate and the lower plate are stacked and fixed by bolts or pins, the transverse groove of the upper plate and the upper surface of the lower plate together form the hollowed-out bearing hole. This split-stack structure allows the strip groove 211 and the hollowed-out bearing hole to be completed in their respective independent processing steps, reducing the process difficulty of simultaneously machining grooves and through holes on a single thick plate.

[0071] Regarding the downward stroke limit of the pusher column 270, limit variant A: An adjusting screw and a locking nut are provided on the cylinder body or mounting bracket of the downward power cylinder 271, with the end of the adjusting screw serving as a stop block at the downward endpoint of the pusher column 270 or the cylinder piston. Limit variant B: A replaceable limit shim is provided between the lower end face of the large-diameter section of the stepped shaft of the pusher column 270 and the upper end face of the receiving cylinder 250, allowing the downward stroke to be changed by replacing shims of different thicknesses.

[0072] The precision fully automatic assembly equipment for wiper connectors, the small assembly module for inner sealing rings, and the assembly method provided by this invention can be manufactured and used in industry, and have positive industrial application value.

Claims

1. A precision fully automatic assembly equipment for windshield wiper connectors, comprising a main unit cabinet frame assembly, a central rotary indexing turntable tooling system, and multiple functional modules arranged circumferentially along the turntable, wherein the multiple functional modules include an inner sealing ring extrusion assembly module (200), characterized in that, The inner sealing ring extrusion assembly module (200) includes: The extrusion platform (210) has a strip groove (211) on its upper surface, and the strip groove (211) has a beginning end and an end end; A small extrusion pusher (220) is slidably disposed in the strip groove (211) and driven by a small extrusion cylinder (221) to push the inner sealing ring along the strip groove (211) from the beginning to the end. The end limiting baffle (230) is fixedly set at the end of the strip groove (211). When the squeezing push block (220) pushes the inner sealing ring to the end limiting baffle (230), the inner sealing ring is squeezed bidirectionally by the squeezing push block (220) and the end limiting baffle (230) and elastically deforms to reduce its outer diameter. After the extrusion is completed, the small extrusion pusher (220) retracts in the direction away from the end, so that the reduced inner sealing ring is exposed at the bottom end area of ​​the strip groove (211); A hollow bearing hole is opened at the bottom of the end of the strip groove (211) and located in front of the end limiting baffle (230). The reduced inner sealing ring is supported above the hollow bearing hole. A cylindrical thin top post (240) is coaxially arranged below the hollow bearing hole, and is driven upward by a lifting cylinder (241) to pass through the hollow bearing hole and lift the reduced inner sealing ring upward; The receiving cylinder (250) is coaxially arranged above the hollow bearing hole. The inner diameter of the receiving cylinder (250) is larger than the outer diameter of the inner sealing ring after it is squeezed and reduced, but smaller than the original outer diameter of the inner sealing ring when it is not deformed. The lifting cylinder (261) drives the receiving cylinder (250) to descend and take the inner sealing ring that is lifted by the cylindrical thin top column (240). After the inner sealing ring enters the receiving cylinder (250), it is constrained by the circumferential inner wall and remains in a reduced state. The transverse slide cylinder (262) drives the receiving cylinder (250) to move horizontally to the housing assembly station; The pusher column (270) is coaxially slidably disposed inside the receiving cylinder (250). Driven downward by a pressure cylinder (271), it pushes the inner sealing ring, which is kept in a reduced state inside the receiving cylinder (250), into the housing.

2. The fully automatic precision assembly equipment for windshield wiper connectors according to claim 1, characterized in that, The centerline of the hollow bearing hole is 0.5 to 0.8 times the original outer diameter of the inner sealing ring from the inner side of the end limiting baffle (230), so that the center of the inner sealing ring pushed to the end limiting baffle (230) is located above the center of the hollow bearing hole.

3. The fully automatic precision assembly equipment for windshield wiper connectors according to claim 1, characterized in that, The lower end face of the receiving cylinder (250) is machined with an inlet chamfer, and the inner wall of the receiving cylinder (250) is provided with an axially extending exhaust groove to prevent the inner sealing ring from being pushed out due to vacuum adsorption inside the cylinder.

4. The fully automatic precision assembly equipment for windshield wiper connectors according to claim 1, characterized in that, The extrusion platform (210) is provided with reinforcing ribs below. The reinforcing ribs are symmetrically arranged on both sides of the strip groove (211) in the surrounding area of ​​the hollow bearing hole to compensate for the local strength reduction caused by opening the hollow bearing hole.

5. The fully automatic precision assembly equipment for windshield wiper connectors according to claim 1, characterized in that, The end limiting baffle (230) is integrally formed with the extrusion platform (210) or rigidly fixed by fasteners, so that the working surface of the end limiting baffle (230) remains perpendicular to the bottom surface of the strip groove (211).

6. The fully automated precision assembly equipment for windshield wiper connectors according to any one of claims 1 to 5, characterized in that, The cylinder body of the lifting cylinder (261) is fixedly installed on the slide of the transverse slide cylinder (262), and the receiving cylinder (250) is fixedly installed on the piston rod end of the lifting cylinder (261). The transverse slide cylinder (262) drives the lifting cylinder (261) and the receiving cylinder (250) to move horizontally as a whole, and the lifting cylinder (261) drives the receiving cylinder (250) to lift independently.

7. The fully automated precision assembly equipment for windshield wiper connectors according to any one of claims 1 to 5, characterized in that, The lower end face of the pusher column (270) is provided with an annular shallow groove that matches the cross-sectional shape of the inner sealing ring, so that the inner sealing ring is subjected to centered force when pushing the material.

8. The fully automatic precision assembly equipment for windshield wiper connectors according to any one of claims 1 to 5, characterized in that, It also includes a material distribution cylinder for pushing the inner sealing ring from the end of the vibrating feeding channel to the beginning of the strip groove (211), wherein the pushing direction of the material distribution cylinder is perpendicular to the direction of the strip groove (211).

9. A precision fully automatic assembly equipment for windshield wiper connectors, comprising a main unit cabinet frame assembly, a central rotary indexing turntable tooling system (700), and multiple functional modules arranged sequentially along the circumference of the turntable, characterized in that, The plurality of functional modules include: The housing loading module (100) is used to automatically load the wiper connector housing onto the turntable fixture; An inner sealing ring miniature assembly module (200) is an inner sealing ring miniature assembly module as described in any one of claims 1 to 8, used to extrude and shrink the inner sealing ring and assemble it into the housing. A sealing ring height detection module (300) is used to detect the assembly height of the inner sealing ring; Seal ring lubrication module (400) is used to apply lubricating grease to the inner seal ring; Automatic latch assembly module (500) is used to press the latch into the housing slot; The latch assembly inspection and finished product unloading module (600) is used to detect whether the latch is assembled in place and to automatically unload the assembled wiper connector.

10. A method for assembling a windshield wiper connector, characterized in that, Includes the following steps: The inner sealing ring is pushed to the beginning of a strip groove opened on the extrusion platform; A small extrusion cylinder drives a small extrusion pusher to push the inner sealing ring along the strip groove to the end limiting baffle fixed at the end of the groove, so that the inner sealing ring is elastically deformed and its outer diameter is reduced by bidirectional compression of the small extrusion pusher and the end limiting baffle. After the extrusion is completed, the small pusher block retracts in the direction away from the end, so that the reduced inner sealing ring is exposed above the hollow bearing hole opened at the bottom of the end of the strip groove. A cylindrical thin pusher is driven by a lifting cylinder to pass upward through the hollow bearing hole, pushing the reduced inner sealing ring upward; A receiving cylinder is driven by a lifting cylinder to descend and take the inner sealing ring that has been lifted up. The inner diameter of the receiving cylinder is larger than the reduced outer diameter but smaller than the original outer diameter, so that the inner sealing ring is kept in a reduced state by the circumferential constraint of the inner wall after entering the cylinder. The receiving cylinder carrying the inner sealing ring is driven by the transverse slide cylinder to move horizontally to the housing assembly station; A pusher cylinder driven by a downward pressure cylinder moves downward inside the receiving cylinder, pushing the inner sealing ring, which is in a reduced state, into the housing.

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