An automatic assembly device for valve stem sealing rings and its assembly method

Abstract

This invention provides an automatic valve stem sealing ring assembly device and its assembly method. The automatic valve stem sealing ring assembly device includes a sealing ring feeding mechanism, a valve stem feeding mechanism, a forming device, and an assembly mechanism. The sealing ring feeding mechanism aligns the sealing rings and sequentially conveys them to the picking position. The valve stem feeding mechanism picks up the valve stem to be fitted with the sealing ring and conveys it to the assembly mechanism. The forming device picks up, forms, and conveys the aligned sealing rings from the sealing ring feeding mechanism to the assembly mechanism. The assembly mechanism assembles the sealing rings onto the corresponding positions on the valve stem. This invention achieves fully automated assembly, significantly reducing assembly time, improving assembly accuracy and product consistency, avoiding sealing ring damage, and each mechanism can adapt to different specifications of valve stems and sealing rings, exhibiting strong versatility and suitability for mass production.

Description

Technical Field

[0001] This invention relates to the field of valve stem assembly technology, and more specifically to an automatic valve stem sealing ring assembly device and its assembly method. Background Technology

[0002] With the development of automation technology, automated equipment is being used more and more widely in various industries. As a core component of automated equipment, the market demand for solenoid valves is growing exponentially. Among them, the valve stem assembly is the core component of the solenoid valve. In the production of solenoid valves, multiple sealing rings with small orifice diameters need to be assembled on the valve stem. That is, the orifice diameter of the sealing ring is smaller than the diameter of the valve stem. During assembly, the inner hole of the sealing ring needs to be enlarged before it is fitted onto the valve stem. This assembly operation requires high precision and is very difficult.

[0003] In existing technologies, the assembly of valve stem sealing rings is usually done manually. This not only results in extremely low assembly efficiency and a long assembly time for each valve stem sealing ring, but also makes it easy to damage the sealing ring during manual assembly, leading to air leakage in the finished solenoid valve, which fails the airtightness test and results in poor product quality consistency. In addition, the high labor costs make it difficult to meet the needs of mass production.

[0004] Although there are some sealing ring assembly machines on the market, the most common ones are used to solve the problem of sealing the connection between two parts by inserting the sealing ring into the sealing area. They are designed with a press-fitting mechanism to press the sealing ring into the sealing area. However, they cannot meet the needs of automated assembly of valve stems with small diameters and multiple sealing rings. Therefore, there is an urgent need for a fully automatic assembly equipment specifically for small sealing rings on valve stems. Summary of the Invention

[0005] In view of the above, the present invention needs to provide an automatic assembly equipment for valve stem sealing rings, so as to realize the fully automated assembly of multiple sealing rings with small inner holes and valve stems, thereby improving assembly efficiency and accuracy.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An automatic assembly device for valve stem sealing rings includes a sealing ring feeding mechanism, a valve stem feeding mechanism, an expansion device, and an assembly mechanism. The sealing ring feeding mechanism sculpts and sequentially conveys the sealing rings to the picking position on it. The valve stem feeding mechanism picks up the valve stem to be fitted with the sealing ring and conveys it to the assembly mechanism. The expansion device picks up, expands, and conveys the sculpted sealing rings from the sealing ring feeding mechanism to the assembly mechanism. The assembly mechanism assembles the sealing rings onto the corresponding positions on the valve stem. The expansion device includes a transfer mechanism, which includes a liftable support plate and several receiving pipes mounted on the support plate. The receiving pipes include an inner tube fixed to the support plate and an outer tube slidably sleeved on the inner tube. The assembly mechanism includes a mounting platform, a valve stem pushing unit, a guide plate, a clamping unit, a guiding unit, and a conveying unit; The valve stem pushing unit is installed on one side of the mounting platform and is used to push the valve stem provided by the valve stem feeding mechanism to the mounting platform in the longitudinal direction. The guide plate is fixed on the mounting platform in the longitudinal direction to receive the valve stem pushed by the valve stem pushing unit and support the movement of the valve stem. There are two clamping units, which are set at both ends of the mounting platform and opposite to each other on both sides of the guide plate. Each clamping unit has a retractable clamping plate, and the two clamping plates are provided with several wide slots opposite each other for clamping the valve stem. The guide unit is laterally disposed on one side of the guide plate and is used to push the valve stem from the valve stem pushing unit onto the guide plate; The feeding unit includes a feeding plate, which is longitudinally and laterally mounted on the other side of the guide plate and is positioned opposite to the guiding unit. The feeding plate has several clamping slots evenly spaced on its edge facing the guiding unit, so that when the valve rod of the guiding unit is pushed out from the valve rod pushing unit onto the guide plate, the valve rod is simultaneously pushed into the clamping slots on the feeding plate. The longitudinal movement of the feeding plate drives the valve rod forward, and the lateral movement and clamping of the bottom end of the valve rod cause the feeding plate to separate from the valve rod, so that the sealing ring on the receiving pipe can be pressed down onto the valve rod.

[0007] Furthermore, the present invention needs to provide an assembly method for an automatic valve stem sealing ring assembly device.

[0008] The assembly method of the automatic assembly equipment for valve stem seals includes the following steps: S1. Sealing ring feeding preparation: The sealing ring feeding mechanism arranges the sealing rings and sends them to the preset picking position in sequence; S2, Valve stem feeding mechanism for valve stem feeding and posture adjustment; S3. Sealing ring material handling and expansion: The expansion device removes the sealing ring from the material handling position of the sealing ring feeding mechanism, expands the sealing ring, and transfers the expanded sealing ring to the transfer mechanism. S4. Install the sealing ring onto the valve stem on the assembly mechanism; the valve stem feeding mechanism transports the valve stem to the assembly mechanism; The guide unit pushes the valve stem from the valve stem pusher unit onto the guide plate and simultaneously pushes it into the clamping groove on the feeding plate. Then the feeding plate moves longitudinally, driving the valve stem forward one position. The clamping unit is activated to clamp the bottom end of the valve stem. Then the feeding plate and the guide unit are reset. The transfer mechanism operates, pressing the sealing ring on the receiving pipe down onto the valve stem; The clamping unit is released, and the guiding unit pushes the next valve rod from the valve rod pushing unit onto the guide plate 43 and simultaneously pushes it into the clamping groove on the feeding plate. The feeding plate moves longitudinally, driving the next valve rod forward one position. The above cycle drives the valve stem to move in a step-by-step manner.

[0009] The beneficial effects of this invention are as follows: This equipment integrates a complete process mechanism for feeding, forming, assembly, testing, and receiving, replacing traditional manual assembly. It greatly shortens the assembly time of a single valve stem sealing ring and increases assembly efficiency by several times, meeting the needs of large-scale production of solenoid valves. At the same time, it eliminates the need for manual intervention, reducing labor intensity and labor costs. Attached Figure Description

[0010] Figure 1 This is a perspective view of an automatic assembly device for valve stem sealing rings according to the present invention.

[0011] Figure 2 This is a schematic diagram of the internal structure of an automatic assembly equipment for valve stem sealing rings according to the present invention.

[0012] Figure 3 This is a structural diagram of the sealing ring feeding mechanism, the expansion device, and the assembly mechanism.

[0013] Figure 4 This is a schematic diagram of the sealing ring feeding mechanism.

[0014] Figure 5 This is a schematic diagram of the internal structure of the material stop block after cross-section.

[0015] Figure 6 This is a schematic diagram of the expansion device.

[0016] Figure 7 for Figure 6 Exploded view of the structure.

[0017] Figure 8 This is a cross-sectional view of the transfer mechanism.

[0018] Figure 9 This is a schematic diagram of the assembly mechanism.

[0019] Figure 10 for Figure 7 Exploded view of the structure.

[0020] Figure 11 This is a schematic diagram of the valve stem feeding mechanism.

[0021] Figure 12 This is a schematic diagram of the receiving mechanism.

[0022] Explanation of reference numerals in the attached figures: 100. Frame; 101. Base; 102. Cover; 1. Sealing ring feeding mechanism; 11. Vibrating plate; 12. Receiving block; 121. Feed inlet; 122. Slide groove; 123. Discharge outlet; 13. Receiving block; 131. Passing port; 14. Stop block; 141. Protrusion; 15. Slide rail; 2. Valve stem feeding mechanism; 21. Dual hopper unit; 211. Material support plate structure; 22. Three-dimensional material transfer unit; 23. Clamping component; 231. Rotary cylinder; 232. Gripper cylinder; 24. Box-pushing cylinder; 25. Box-pushing plate; 3. Expansion device; 31. Frame; 311. Base plate; 312. Rod frame; 32. Material support mechanism; 321. First translation cylinder; 322. Lifting cylinder; 323. Expansion pin; 33. Pressing mechanism; 331. Horizontal push cylinder; 332. Pressing cylinder; 333. Pressing tube; 34. Rotary... Receiving mechanism; 341, Second translation cylinder; 342, Translation frame; 343, Material picking cylinder; 344, Material unloading cylinder; 345, Material receiving pipe; 346, Material pushing pipe; 347, Pipe pushing cylinder; 4. Assembly mechanism; 41, Base; 42, Valve stem pushing unit; 421, Material storage seat; 423, Material pushing plate; 4231, Vertical rod groove; 43, Guide plate; 44, Clamping unit; 441, Clamping cylinder; 442 45. Clamping plate; 45. Guide unit; 451. Guide cylinder; 452. Guide plate; 4521. Guide end face; 4522. Drop port; 4523. Protrusion; 46. Feeding unit; 461. Longitudinal slide rail; 462. Cylinder frame; 463. Longitudinal push cylinder; 464. Horizontal push cylinder; 465. Feeding plate; 5. Receiving mechanism; 51. Detection channel; 511. Material stop; 52. Double receiving bin unit. Detailed Implementation

[0023] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0024] like Figure 1 , Figure 2 As shown, this embodiment of the invention provides an automatic assembly equipment for valve stem sealing rings, which realizes the automated assembly of multiple sealing rings on the valve stem, replacing manual operation and improving assembly efficiency and accuracy. It includes a frame 100, a sealing ring feeding mechanism 1, a valve stem feeding mechanism 2, an expansion device 3, an assembly mechanism 4, and a receiving mechanism 5. The various mechanisms work together to complete the fully automated operation from feeding the sealing rings and valve stem to expanding the sealing rings and assembling them with the valve stem, and finally, the receiving mechanism 5 performs finished product inspection and delivery.

[0025] The frame 100 serves as the installation base for the entire equipment, including the base 101 and the cover 102. The cover 102 is installed on the upper end of the base 101, forming a working space above the base 101. The sealing ring feeding mechanism 1, the valve stem feeding mechanism 2, the expansion device 3, the assembly mechanism 4, and the receiving mechanism 5 are all installed in this working space, effectively isolating external dust and debris from interfering with the assembly operation and ensuring assembly accuracy.

[0026] The sealing ring feeding mechanism 1 is located on one side of the top surface of the machine base 101. The expanding device 3 and the assembly mechanism 4 are arranged side by side on the other side of the top surface. The valve stem feeding mechanism 2 and the receiving mechanism 5 are arranged opposite each other at both ends of the top surface. The assembly mechanism 4 is located at the connection position between the expanding device 3 and the receiving mechanism 5. The sealing ring feeding mechanism 1 organizes the scattered sealing rings and transports them in sequence to the picking position on it. The valve stem feeding mechanism 2 grabs and transports the valve stem that needs to be equipped with a sealing ring to the assembly mechanism 4. The expanding device 3 picks up the sealing rings organized by the sealing ring feeding mechanism 1 at the picking position, expands and transports them to the assembly mechanism 4. The assembly mechanism 4 assembles the expanded sealing rings into the corresponding positions on the valve stem. The receiving mechanism 5 inspects the valve stem after assembly and sends it out.

[0027] like Figures 2-4 As shown, the sealing ring feeding mechanism 1 is an automatic feeding mechanism for sealing rings, used to organize and orderly convey the sealing rings to the picking station for the expanding device 3 to pick up. The sealing ring feeding mechanism 1 includes a vibrating plate 11, a slide 15, a receiving block 12, a receiving block 13, and a blocking block 14. In this embodiment, there are two vibrating plates 11, which are symmetrically arranged on the top surface of the machine base 101. Each vibrating plate 11 stores sealing rings to be assembled. The outlets of the two vibrating plates 11 are respectively provided with slides 15, which utilize the vibration... The vibration of the disc 11 causes the messy sealing rings inside to slide orderly along the slide 15, realizing the automatic alignment and feeding of the sealing rings. In this embodiment, the number of slides 15 set on the two discs 11 is the same as the number of sealing rings to be assembled on each valve stem. Specifically, each disc 11 is connected to a set of slides at its outlet, and there are 3 slides in a set. That is, the two discs 11 are connected to a total of 6 slides, which are used to provide 6 sealing rings to be installed on one valve stem, and they are respectively fitted onto different height positions on the valve stem.

[0028] See also Figure 4 , Figure 5Each vibrating disc 11 has a receiving block 12 at the outlet of a set of slides 15. The top surface of the receiving block 12 has a groove 122 perpendicular to the extension direction of the slides 15, and material channels on both sides of the groove 122. One material channel is connected to the slide 15 to guide the sealing ring in, and can be regarded as the feed channel 121. The opposite material channel is used to guide the sealing ring out, and can be regarded as the discharge channel 123. Furthermore, the discharge channel 123 penetrates the bottom surface of the receiving block 12. The receiving block 13 is slidably installed in the slide groove 122. The receiving block 13 is a long strip-shaped block with a groove on its top surface along its length. Correspondingly, side plates are formed on both sides of the groove. The side plate on one side of the feed channel 121 can be regarded as the feed side plate, and the opposite side can be regarded as the discharge side plate. Several material passages 131 are opened on each side plate, and the material passages 131 on the side plates are staggered. Several material pushing grooves 132 are also opened on the receiving block 13. The material pushing grooves 132 penetrate through the top and bottom surfaces of the receiving block 13, parallel to the extension direction of the feed channel 121, and each material pushing groove 132 is opened in the material passage 131 of the discharge side plate, penetrating the discharge side of the receiving block 13. The material pushing grooves 132 are used to cooperate with the discharge channel 123. When the material pushing grooves 132 are connected to the discharge channel 123, the sealing ring can be pushed out. The retaining block 14 is fixedly installed on the receiving block 12. The bottom surface of the retaining block 14 has protrusions 141 spaced apart, extending downwards into the groove of the receiving block 13. This ensures that after the sealing ring slides into the groove of the receiving block 13, the sealing ring is positioned between adjacent protrusions 141. When the receiving block 13 moves laterally, the protrusions 141 block the sealing ring, allowing it to slide relative to the groove. The receiving block 13 is driven by a cylinder or other linear drive mechanism to reciprocate. When receiving material, the material receiving block 13 aligns the material inlet 131 on its feed side plate with the feed inlet 121. The sealing ring can slide from the feed inlet 121 into the groove of the material receiving block 13. After the sealing ring enters the groove of the material receiving block 13, it abuts against the discharge side plate of the material receiving block 13 to prevent it from sliding out. Then, the material receiving block 13 moves laterally along the slide groove 122. The material receiving block 13 moves laterally a distance equal to the material inlet 131, so that the material inlet 131 on the feed side plate is misaligned with the feed inlet 121, preventing the subsequent sealing ring from entering. When the material receiving block 13 moves, the sealing ring is blocked by the protrusion of the retaining block 14. If the sealing ring is blocked and cannot slide together with the receiving block 13, it will move relative to the receiving block 13 by a feed port 131 position, so that the sealing ring is aligned with the feed port 131 on the discharge side plate of the receiving block 13. At this time, the feed port 131 on the discharge side plate of the receiving block 13 will be aligned with the discharge port 123 of the receiving block 12. The discharge channel 123 on the receiving block 12 and the feeding groove 132 of the receiving block 13 are also connected, which facilitates the component of the expanding device 3 to rise and pass through the sealing ring and then move along the discharge port 123 to remove the sealing ring from the feed port 131 on the discharge side plate. In this way, the sealing rings are sequentially entered into the groove of the receiving block 13 one after another to wait for removal.Understandably, in this embodiment, the receiving block 13 has 6 material picking positions, enabling the removal of 6 sealing rings at a time.

[0029] like Figure 3 As shown, the expanding device 3 is located at the discharge port 123 of the receiving block 12 of the sealing ring feeding mechanism 1. It is used to take out the sealing rings conveyed by the sealing ring feeding mechanism 1 and perform expanding treatment, and to convey the expanded sealing rings to the assembly mechanism 4. The expanding device 3 includes a stand 31, a material supporting mechanism 32, a pressing mechanism 33, and a transfer mechanism 34. Each unit works together to complete the material taking, expanding, and transferring of the sealing rings.

[0030] The support frame 31 serves as the mounting bracket for the expansion device 3, including a base plate 311 and a rod frame 312 erected on the base plate 311. The base plate 311 is fixed to the top surface of the machine base 101, providing an installation foundation for the material support mechanism 32. The rod frame 312 provides installation and hoisting support for the pressing mechanism 33 and the transfer mechanism 34.

[0031] The material support mechanism 32 is slidably mounted on the base plate 311 and is used to remove the sealing ring carried in the groove of the receiving block 13. It includes a material support seat 320, a first translation cylinder 321, a lifting cylinder 322, and several expansion pins 323. The material support seat 320 is slidably mounted on the base plate 311 via a slide rail, sliding in the direction of extension of the slide rail 15, and can slide to below the receiving block 12. Understandably, the receiving block 12 can be installed at a preset height on one side of the upright frame 31. The first translation cylinder 321 is fixed to the base plate 311 and lifts / lowers... The cylinder 322 is slidably mounted on the support base 320 via a slide rail. The telescopic end of the first translation cylinder 321 is fixedly connected to the support base 320, which can drive the lifting cylinder 322 to reciprocate towards or away from the receiving block 12. Several expansion needles 323 are fixed to the piston rod extension end of the lifting cylinder 322. The piston rod drives the expansion needles 323 to rise and fall. Each expansion needle 323 corresponds to the discharge port 123 of the receiving block 12. The lifting cylinder 322 can drive the expansion needles 323 to rise and enter the groove of the receiving block 13, where they are fitted with the sealing ring.

[0032] Furthermore, each expansion needle 323 has a cylindrical section at the lower end and a conical section at the upper end. The diameter of the conical section gradually decreases along the upward direction, and the diameter of the cylindrical section is slightly larger than the inner diameter of the sealing ring, so that the sealing ring can slide down from the conical section to the bottom of the cone, fit into the cylindrical section, expand, and be tensioned and fitted onto the cylindrical section of the expansion needle 323.

[0033] During the material receiving operation, the first translation cylinder 321 drives the material support seat 320 to move below the material receiving block 13, and the lifting cylinder 322 drives the expansion needle 323 to rise. The expansion needle 323 rises and inserts into the sealing ring. Then, the first translation cylinder 321 drives the material support seat 320 to move horizontally, so that the expansion needle 323 drives the sealing ring to move out of the material outlet 131 of the material receiving block 13's discharge side plate.

[0034] Furthermore, the support base 320 includes a base plate, upright plates on both sides of the base plate, and a lifting plate between the upright plates. A lifting cylinder 322 is fixed on the base plate, and the piston end of the lifting cylinder is connected to the lifting plate, which drives the lifting plate to rise and fall. Several expansion pins 323 are fixedly erected on the lifting plate, and the height of the cylindrical section of the several expansion pins 323 varies in a stepped manner to support the sealing ring at different height positions, so as to facilitate the matching and corresponding installation of the sealing ring at different positions on the valve stem during subsequent installation.

[0035] Please combine Figures 6-8 The pressing mechanism 33 is fixed on the rod 312 of the upright frame 31. It is used to press down and position the sealing ring on the expanding needle 323 of the supporting mechanism 32, so that the sealing ring slides down to the preset position and maintains a horizontal posture, providing a high-precision positioning reference for subsequent expansion operations. The pressing mechanism 33 includes a mounting plate 330, a horizontal push cylinder 331, a pressing cylinder 332, and pressing pipes 333. The horizontal push cylinder 331 can be mounted on a mounting plate at a preset height on one side of the upright 31. The mounting plate 330 is mounted on the telescopic rod of the horizontal push cylinder 331. The pressing cylinder 332 is fixedly mounted on the mounting plate 330 and can slide horizontally back and forth under the action of the horizontal push cylinder 331. The telescopic rod of the pressing cylinder 332 is downward and fixedly connected to a mounting block. Several pressing pipes 333 are fixedly mounted on the mounting block with their openings facing downward. The inner diameter of the pressing pipe 333 is equivalent to the diameter of the cylindrical section at the lower end of the expansion needle 323. After the pressing pipe 333 is inserted into the expansion needle 323, the pressing cylinder 332 drives the pressing pipe 333 to move downward, thereby pushing the sealing ring onto the cylindrical section of the expansion needle 323. Understandably, the number of pressure tubes 333 corresponds to the number of expansion needles 323, and their positions correspond during pressure. The lower end of the pressure tube 333 is provided with a pressure groove, the size of which is similar to that of the sealing ring, to accurately position the sealing ring.

[0036] During the positioning operation, the horizontal push cylinder 331 extends, driving the downward press cylinder 332 to move horizontally, aligning the axis of the downward press tube 333 with the axis of the expansion needle 323. Then, the downward press cylinder 332 starts to press down, driving the downward press tube 333 to move downward, pressing the sealing ring on the expansion needle 323 against the bottom of the expansion needle 323, keeping the sealing ring in a horizontal state, and completing the positioning.

[0037] The transfer mechanism 34 is used to transfer the sealing ring on the expansion pin 323 for easy assembly. It includes a lifting mechanism and a transfer mechanism. The lifting mechanism lifts the sealing ring onto the receiving mechanism, and the transfer mechanism transfers and drops the sealing ring onto the assembly mechanism 4. The lifting mechanism includes a pusher tube 346 and a pusher cylinder 347. The pusher tube 346 is sleeved on the cylindrical section of each expansion pin 323. The top surface of the pusher tube 346 is flat so that the sealing ring is held against the top surface of the pusher tube 346 for positioning when it is pushed and expanded by the pressing tube 333. The distance between the top surface of the pusher tube 346 and the top of the cylindrical section is approximately the thickness of the sealing ring. A pusher cylinder 347 is mounted on the lifting plate of the support base 320, and the cylinder rod of the pusher cylinder 347 is fixedly connected to the pusher tube 346. The expansion needle pushes the pusher tube 346 upward through the pusher cylinder 347, causing the sealing ring to move upward and disengage from the expansion needle 323, thus transferring the expanded sealing ring. In this embodiment, the number of pusher tubes 346 corresponds to the number of expansion needles 323, and several pusher tubes 346 are fixed on a pad. The pad is slidably fitted onto the bottom end of the expansion needle 323. The pad is connected to the pusher cylinder 347, and pushing the pad upward pushes the several pusher tubes 346 upward.

[0038] The material transfer mechanism includes a second translation cylinder 341, a translation frame 342, a picking cylinder 343, a stripping cylinder 344, and several receiving pipes 345. The second translation cylinder 341 is fixedly installed on the top of the frame 312 and arranged parallel to the first translation cylinder 321. The translation frame 342 is suspended from the telescopic end of the second translation cylinder 341 and can slide back and forth horizontally under the drive of the second translation cylinder 341. The picking cylinder 343 is vertically fixed on the top of the translation frame 342, with its piston end vertically downward and a support plate (not shown in the figure) fixedly connected to its lower end. The stripping cylinder 344 is installed on the top surface of the support plate, and the movable end of the stripping cylinder 344 passes downward through the support plate and extends below the support plate.

[0039] The receiving pipe 345 adopts a double-layer pipe structure. The inner pipe is fixedly connected to the bottom surface of the bearing plate and extends vertically downward. The outer pipe can be axially slidably sleeved on the outside of the inner pipe, and the outer pipe is connected to the unloading cylinder 344. The outer diameter of the inner pipe is approximately the same as the diameter of the cylindrical section of the expansion needle 323. The inner pipe can be sleeved at the connection between the cylindrical section and the conical section of the expansion needle 323, so that when the pushing pipe 346 pushes the sealing ring, the sealing ring can slide smoothly onto the inner pipe. Furthermore, the inner diameter of the inner pipe is slightly larger than the outer diameter of the valve stem, allowing the inner pipe to be sleeved on the valve stem. When the sealing ring is pushed into the valve stem, the outer pipe extends downward under the action of the unloading cylinder 344, thereby pushing against the sealing ring clamped on the inner pipe, and the outer pipe can push the sealing ring down and remove it from the inner pipe.

[0040] Specifically, during the expansion action, the second translation cylinder 341 drives the translation frame 342 to move above the expansion needle 323, aligning the receiving tube 345 vertically with the expansion needle 323. The picking cylinder 343 drives the support plate downward, causing the receiving tube 345 and the expansion needle to move downward until the inner tube of the receiving tube 345 fits seamlessly with the conical bottom of the expansion needle 323. Then, the pushing cylinder 347 pushes the pushing tube 346 upward, causing the sealing ring to move upward and tightly fit onto the inner tube of the receiving tube 345, thus completing the transfer of the sealing ring from the expansion needle 323 to the receiving tube 345. Subsequently, the second translation cylinder 341 drives the translation frame 342 to move above the assembly mechanism 4, awaiting subsequent assembly.

[0041] Understandably, the number of receiving tubes 345 corresponds to the number of expanding needles 323, and the outer tubes of several receiving tubes 345 are fixed on a movable plate. The movable plate can be raised and lowered relative to the bearing plate. The movable plate is connected to the unloading cylinder 344. The receiving tubes 345 are installed at the bottom of the movable plate, pushing the movable plate down, thereby pushing the outer sleeves of several receiving tubes 345 down. Furthermore, the length of the downward extension of the receiving tubes 345 corresponds to the height position of the sealing ring on the receiving tubes 345, so that several receiving tubes 345 can be removed at once when the movable plate descends.

[0042] like Figure 11 As shown, the valve stem feeding mechanism 2 realizes automatic valve stem feeding and is used to orderly transport the valve stems to be assembled to the assembly mechanism 4. The valve stem feeding mechanism 2 includes a hopper unit 21, a three-dimensional material transfer unit 22 and a clamping component 23, which can realize batch feeding, automatic material picking and posture adjustment of valve stems.

[0043] There are two hopper units 21, which are fixed side by side on the top surface of the base 101. The hopper unit 21 includes a hopper and a liftable pallet structure 211 installed in the hopper. The pallet structure 211 includes a lifting member and a tray. The lifting member is installed on the bottom wall of the hopper. The telescopic end of the lifting member extends upward into the hopper. The tray is located in the hopper and is connected to the telescopic end of the lifting member. The lifting member drives the tray to rise and fall. The tray is used to place the valve stem. The lifting member drives the tray to rise and lift the valve stem.

[0044] The three-dimensional material transfer unit 22 is a conventional X, Y, Z three-axis linear motor, which is mounted above the hopper unit 21 via an arched frame. It can drive the clamping component 23 to make precise reciprocating movements in the X, Y, and Z directions to realize the picking and transfer of valve stem.

[0045] The clamping component 23 is located at the lower end of the Z-axis linear motor of the three-dimensional material transfer unit 22. It is used to clamp the valve stem and adjust the assembly posture of the valve stem. It includes a rotary cylinder 231 and a gripper cylinder 232 installed at the output end of the rotary cylinder 231. The gripper cylinder 232 can clamp and release the valve stem. The rotary cylinder 231 can drive the gripper cylinder 232 to rotate 90°, turning the horizontal valve stem clamped by the gripper cylinder 232 into an vertical state, which meets the posture requirements of the subsequent sealing ring assembly. Then, the three-dimensional material transfer unit 22 drives the clamping component 23 to transport the vertical valve stem to the designated assembly position of the assembly mechanism 4.

[0046] The valve stem feeding mechanism 2 also includes a receiving tray mechanism, which includes a side-shifting drive mechanism and a pusher plate 25. The side-shifting drive mechanism includes a lead screw and a bushing 24. The lead screw is located on the same side of the two hoppers, and the bushing 24 is mounted on the lead screw. The rotation of the lead screw drives the bushing 24 to move. The pusher plate 25 is mounted on the bushing 24. When the valve stem of one of the hoppers is removed, the lead screw rotates and drives the bushing 24 to move, thereby driving the pusher plate 25 to move. This can push the empty hopper in that hopper from the top of the hopper to the adjacent hopper, realizing the automatic transfer of empty hoppers. In this way, multiple hoppers with valve stems can be stacked in one hopper, and the other hopper can collect the stacked empty hoppers, improving the continuous feeding capacity of the equipment.

[0047] like Figure 3 , Figure 9 , Figure 10 As shown, the assembly mechanism 4 is mounted on the base plate 311 and is used to assemble the sealing ring after the expansion device 3 expands to the valve stem. The assembly mechanism 4 includes a mounting platform 41, a valve stem pushing unit 42, a guide plate 43, a clamping unit 44, a guiding unit 45, and a conveying unit 46. Each unit works together to complete the positioning of the valve stem, the assembly of the sealing ring, and the step-by-step conveying of the valve stem.

[0048] The mounting platform 41 is fixed on the base plate 311 at one end opposite to the material support mechanism 32, and is located directly below one end of the second translation cylinder 341. In this embodiment, the mounting platform 41 is a rectangular body with a transverse direction in the same direction as the extension and retraction direction of the first translation cylinder 321, and a longitudinal direction in the plane that is perpendicular to the extension and retraction direction of the first translation cylinder 321.

[0049] The valve stem pushing unit 42 is installed on one side of the mounting platform 41 and is used to push the valve stem to the mounting platform 41 longitudinally. The valve stem pushing unit 42 includes a storage seat 421 and a pusher plate 423. The storage seat 421 is fixed to the side of the top of the mounting platform 41 and has a pusher groove at its top. The pusher plate 423 is slidably installed in the pusher groove. The pusher plate 423 is connected to a pushing drive (such as a cylinder), which drives the pusher plate 423 to slide in the pusher groove. A vertical rod groove 4231 is provided on the top surface of the end of the pusher plate 423. The width of the vertical rod groove 4231 corresponds to the diameter of the valve rod. The valve rod feeding mechanism 2 places the upright valve rod into the vertical rod groove 4231, which can limit the swaying of the valve rod and maintain the upright position of the valve rod. Correspondingly, a groove wall is formed at the end of the pusher plate 423. The pusher plate 423 slides along the pusher groove under the action of the pushing drive, which can push the valve rod in the vertical rod groove 4231.

[0050] The guide plate 43 is fixedly mounted on the mounting platform 41 along the longitudinal direction to receive the valve stem pushed by the valve stem pushing unit 42 and support the movement of the valve stem. The guide plate 43 is a rectangular plate that extends longitudinally. One end of the guide plate is connected to the storage seat 421 on one side of the mounting platform 41, and the other end extends to the other side of the mounting platform 41. The top surface of the guide plate 43 is flush with the bottom surface of the upright groove 4231 to ensure that the valve stem can be moved horizontally from the upright groove 4231 to the top surface of the guide plate 43.

[0051] Two clamping units 44 are provided and are installed opposite each other on the mounting platform 41. The two clamping units 44 are respectively set on both sides of the guide plate 43 to clamp the bottom end of the valve stem, realize the assembly and positioning of the valve stem, and prevent the valve stem from shifting or tilting. The clamping unit 44 includes a clamping cylinder 441 and a clamping plate 442 fixed to the telescopic end of the clamping cylinder 441. The clamping plate 442 is flat against the top surface of the guide plate 43. Wide slots are equally spaced on the clamping plate 442. The wide slots of the two opposite clamping plates 442 match the outer periphery of the bottom end of the valve stem. By pushing the clamping plates 442 towards the valve stem by the two clamping cylinders 441 respectively, the opposite sides of the bottom end of the valve stem are respectively inserted into the wide slots of the corresponding clamping plates 442 to realize the clamping and positioning of the valve stem.

[0052] The guiding unit 45 is located on the same side as one of the clamping units 44. It is used to push the valve stem out of the upright slot 4231 of the pusher plate 423 and to guide the movement of the pushed valve stem in conjunction with the feeding unit 46. The guiding unit 45 includes a guide cylinder 451 and a guide plate 452 fixed to the telescopic end of the guide cylinder 451. The guide plate 452 has a guide end face 4521 for guiding the valve stem to move longitudinally. A clearance groove is provided on the side of the guide end face 4521 adjacent to the storage seat 421 (which can be regarded as the first end of the guide end face) to accommodate the groove wall at the end of the pusher plate 423. Correspondingly, a push block 4523 is formed on one side of the clearance groove. The push block 4523 is smaller than or matches the size of the upright slot 4231 and is used to push the valve stem out of the upright slot 4231 of the pusher plate 423. When the guide cylinder 451 pushes the guide plate 452 to move laterally, the push block 4523 pushes the valve stem out of the upright slot 4231.

[0053] The conveying unit 46 is used to drive the valve stem to move backward in a stepping manner, realizing continuous assembly of the valve stem. The conveying unit 46 includes a longitudinal slide rail 461, a cylinder frame 462, a longitudinal thrust cylinder 463, a transverse thrust cylinder 464, and a feeding plate 465. The longitudinal slide rail 461 is fixed longitudinally to the top surface of the mounting platform 41 (it can avoid movement interference with the clamping cylinder 441 through height misalignment). The cylinder frame 462 is slidably mounted on the longitudinal slide rail 461, and its top end extends above the clamping cylinder 441. The longitudinal thrust cylinder 463 is fixed on the mounting platform 41, and its telescopic end is fixedly connected to the cylinder frame 462, which can drive the cylinder frame 462 to reciprocate along the longitudinal slide rail 461. The transverse thrust cylinder 464 is fixed to the top of the cylinder frame 462, and the feeding plate 465 is slidably mounted on the cylinder frame 462 laterally, and is driven by the transverse thrust cylinder 464 to reciprocate laterally towards or away from the valve stem. The feeding plate 465 has clamping grooves at equal intervals on one side facing the guide plate 452, which are used to clamp the valve stem to drive the valve stem to move. The feeding plate 465 can abut against the guide end face 4521 of the guide plate 452. Under the action of the longitudinal thrust cylinder 463, the valve stem clamped in the clamping groove slides longitudinally along the guide end face 4521.

[0054] Furthermore, a discharge port 4522 is provided on the side of the guide end face 4521 away from the storage seat 421 (which can be regarded as the end of the guide end face). When the valve stem moves to the end of the guide end face 4521, it falls from the discharge port 4522 and tilts from the vertical state to the horizontal state, which facilitates the detection and conveying of the subsequent receiving mechanism 5.

[0055] The process of assembling the sealing ring to the valve stem by assembly mechanism 4 is as follows: The first valve stem is inserted into the upright groove 4231 of the pusher plate 423, and then the pusher plate 423 is pushed to the end of the pusher groove, with the upright groove 4231 exposed at the end of the storage seat 421. The guide cylinder 451 pushes the guide plate 452 to move laterally. The guide end face 4521 of the guide plate 452 is attached to the side of the feeding plate 465 with the clamping groove. The push block 4523 of the guide plate 452 pushes the first valve rod in the upright groove 4231 out and sends it to the first clamping groove at the beginning of the feeding plate 465. At this time, the feeding plate 465 is in the maximum extended state of the lateral movement, so as to receive the valve rod pushed out by the push block 4523. Under the action of the longitudinal thrust cylinder 463, the feeding plate 465 moves longitudinally by the distance between adjacent clamping slots, which corresponds to the position of the second clamping slot when the feeding plate 465 is not moved longitudinally. After the longitudinal movement is completed, the two clamping units 44 are activated to clamp the first valve stem. The feeding plate 465 is retracted laterally under the action of the horizontal push cylinder 464, thus disengaging the first clamping groove from the first valve stem. At the same time, the guide plate 452 is retracted laterally under the action of the guide cylinder 451. After the feeding plate 465 is retracted laterally, it is reset longitudinally under the action of the vertical push cylinder 463, and then extended laterally under the action of the horizontal push cylinder 464. Thus, the second clamping groove of the feeding plate 465 will clamp the first valve stem, and the empty space of the first clamping groove can clamp the next valve stem. The second valve stem is inserted into the upright groove 4231 of the pusher plate 423, and then the pusher plate 423 is pushed to the end of the pusher groove, with the upright groove 4231 exposed at the end of the storage seat 421. The guide cylinder 451 pushes the guide plate 452 to move laterally, and the guide end face 4521 of the guide plate 452 is attached to the side of the feeding plate 465 with the clamping groove. The push block 4523 of the guide plate 452 pushes the second valve rod in the upright groove 4231 out and sends it to the first clamping groove at the beginning of the feeding plate 465. When the two clamping units 44 open, they loosen their grip on the first valve stem. At this time, the first valve stem is in the second clamping groove of the feeding plate 465, and the guide end face 4521 of the guide plate 452 cooperates with it to maintain stable upright position. Under the action of the longitudinal thrust cylinder 463, the feeding plate 465 moves longitudinally to the distance between adjacent clamping slots. The first valve rod will correspond to the position of the third clamping slot when the feeding plate 465 is not moving longitudinally, and the second valve rod will correspond to the position of the second clamping slot when the feeding plate 465 is not moving longitudinally. Similarly, after the longitudinal movement is completed, the two clamping units 44 will be activated to clamp the first valve rod and the second valve rod. By repeating the above steps, several valve stems (six in this embodiment) can be moved to their corresponding positions in sequence and clamped by two clamping units 44. Then, several receiving pipes 345 of the transfer mechanism 34 are aligned with the valve stems and descend. The sealing ring is pushed by the outer tube and can be fitted onto the valve stems at the corresponding height position. Thus, in subsequent assembly, whenever a valve stem is fed in and held by two clamping units 44, and the feeding plate 465 separates from the guide plate 452, the material receiving pipes 345 of the transfer mechanism 34 align with the valve stems and descend, fitting the sealing rings onto the valve stems. In this way, a valve stem will be fitted with the corresponding number of sealing rings in the clamping slots, thereby completing the automated encapsulation of several sealing rings by performing the corresponding number of pressing operations on a valve stem.

[0056] The process of assembling the sealing ring to the valve stem can be summarized as follows: After the valve stem pushing unit 42 pushes the valve stem to the side of the top surface of the guide plate 43, the guiding unit 45 and the feeding unit 46 move closer together and clamp. The protrusion 4523 of the guide plate 452 pushes the valve stem from the upright groove 4231 of the pusher plate 423 to the top surface of the guide plate 43 and simultaneously engages it in the first clamping groove on the feeding plate 465. Then, the longitudinal push cylinder 463 extends, pushing the feeding unit 46 to move longitudinally, moving the valve stem to the second clamping engagement between the guide plate 452 and the feeding plate 465. The position stops, then the two clamping units 44 move, pushing the clamping plate 442 to clamp the bottom end of the valve stem. Then the guide unit 45 and the conveying unit 46 reset, and the valve stem pushing unit 42 resets accordingly. The second valve stem is placed into the upright groove 4231 and pushed to the side of the guide plate 43. Then the above actions are repeated. At this time, the first valve stem is locked with the second clamp of the feeding plate 465, realizing the step-by-step feeding of the valve stem until all the clamping grooves of the feeding plate 465 contain valve stems. The receiving pipe 345 of the transfer mechanism 34 moves to the top of the valve stem under the drive of the second translation cylinder 341 and the receiving pipe 345 descends and is sleeved on the valve stem. The unloading cylinder 344 pushes the outer tube of the receiving pipe 345 to move down relative to the inner tube, pushing out the expansion seal ring that is tensioned at the bottom of the outer tube. The seal ring contracts under its own elasticity and is sleeved into the corresponding seal ring groove on the valve stem, completing the assembly of a single set of seal rings. It should be noted that the length of the receiving pipe 345 is shortened sequentially along the conveying direction of the valve stem to ensure that multiple sealing rings on the valve stem can be assembled sequentially from bottom to top, avoiding interference between the sealing rings during the assembly process; that is, the sealing ring corresponding to the valve stem in the first clamping groove on the feeding plate 465 is in the sealing ring groove at the bottom, and then the installation position of the sealing ring gradually rises with each movement of the valve stem.

[0057] After each set of sealing rings is assembled, the receiving pipe 345 rises and returns to the expanding device 3 to expand and pick up the sealing rings again; at the same time, the guide cylinder 451 of the guide unit 45 pushes the guide plate 452 to abut the valve stem, and the horizontal push cylinder 464 of the feeding unit 46 extends, driving the feeding plate 465 to move horizontally and extend. The clamping cylinders 441 of the two clamping units 44 are reset, releasing the clamp on the bottom end of the valve stem. The longitudinal thrust cylinder 463 extends, driving the feeding plate 465 to be conveyed backward synchronously with the valve stem, realizing the stepping movement of the valve stem. After the valve stem moves to the next assembly position, the two clamping units 44 clamp the bottom of the valve stem again, the guide cylinder 451 and the horizontal push cylinder 464 reset, the guide plate 452 and the feeding plate 465 retract and release the clamping of the valve stem, and the conveying unit 46 resets as a whole, waiting for the next conveying operation. Repeat the above steps until all the sealing ring grooves on the valve stem are fully assembled. The assembled valve stem is moved to the discharge port 4522 of the guide plate 452 by the conveying unit 46, falls from the discharge port 4522 and turns to a horizontal state, and enters the receiving mechanism 5.

[0058] like Figure 12 As shown, the receiving mechanism 5 is installed at the discharge end of the assembly mechanism 4. It is used to transport and inspect the assembled valve stems and classify and store qualified and defective products. It includes an inspection channel 51 and a double receiving bin unit 52. The inlet end of the inspection channel 51 is connected to the discharge port 4522 of the guide plate 452, and the discharge end extends to the sealing door of the frame 100, which facilitates the handling of finished products by the staff. The double receiving bin unit 52 is fixed to the side of the inspection channel 51, and its structure is the same as that of the double bin unit 21, which can realize the batch storage of qualified products.

[0059] The detection channel 51 serves as the conveying and detection channel for the valve stem. Its discharge end is equipped with a slidable baffle 511. Under normal conditions, the baffle 511 is in the closed state, preventing the valve stem from sliding out of the discharge end of the detection channel 51. A sensor is installed in the middle of the detection channel 51. The sensor is electrically connected to the control system of the equipment and can detect parameters such as the number and assembly position of the sealing rings installed on the valve stem to determine whether the valve stem is a qualified product, effectively avoiding assembly defects such as missing, over-installation, and misalignment of the sealing rings.

[0060] During testing, the assembled horizontal valve stem falls from the discharge port 4522 into the testing channel 51 and slides along the channel towards the discharge end. When the sensor detects that the valve stem is a qualified product, the baffle 511 remains closed, and the dual receiving bin unit 52 clamps and collects the valve stem, achieving automatic collection of qualified products. When the sensor detects that the valve stem is a defective product, the control system sends a signal to drive the baffle 511 to slide open, and the defective product slides out from the discharge end of the testing channel 51 and falls into the defective product collection box below the testing channel 51, achieving automatic classification of qualified and defective products.

[0061] This invention also provides an assembly method based on the above-mentioned automatic valve stem seal assembly equipment, comprising the following steps: S1. Place the sealing ring into the vibrating plate 11 of the sealing ring feeding mechanism 1, and place the tray with the valve stem into the double material bin unit 21 of the valve stem feeding mechanism 2. The material tray structure 211 drives the tray to rise to the material picking position. S2. The vibration of the vibrating plate 11 causes the sealing ring to slide along the slide into the feed port of the receiving block 12. The receiving block 13 slides to transport the sealing ring to the slot and position it, thus completing the alignment of the sealing rings. S3, the three-dimensional material transfer unit 22 drives the clamping part 23 to move, the gripper cylinder 232 clamps the horizontal valve stem, the rotary cylinder 231 drives the gripper cylinder 232 to rotate 90°, turning the valve stem into an upright state, and then the valve stem is transported to the valve stem pushing unit 42 of the assembly mechanism 4, and the valve stem falls into the upright groove 4231. S4. In the expanding device 3, the expanding needle 323 of the supporting mechanism 32 is inserted into the inner ring of the sealing ring to complete the material taking. The pressing mechanism 33 presses the sealing ring against the fixed end of the expanding needle 323 and against the top surface of the push tube 346. The inner tube of the transfer mechanism 34 is fitted with the expanding needle 323 to expand the sealing ring, so that the sealing ring is tensioned and fitted at the bottom end of the outer tube. Then the second translation cylinder 341 drives the receiving tube 345 to move above the assembly mechanism 4. S5. The pusher cylinder 422 drives the pusher plate 423 to push the valve stem to the top surface of the guide plate 43. The clamping unit 44 clamps the bottom end of the valve stem. The receiving pipe 345 descends and is sleeved on the outside of the valve stem. The unloading cylinder 344 pushes the outer tube down to push out the expanded sealing ring. The sealing ring elastically shrinks and falls into the corresponding sealing ring groove of the valve stem, completing the assembly of a single set of sealing rings. S6. The receiving pipe 345 is reset to the expanding device 3 to take material and expand again. The guiding unit 45 abuts against the upper part of the valve stem. The conveying unit 46 clamps the valve stem and drives it to move step by step to the next assembly position. The clamping unit 44 repositions the valve stem. Repeat steps S4-S5 until all sealing ring grooves of the valve stem are assembled. S7. The assembled valve stem falls from the drop port 4522 of the guide plate 452 and turns to a horizontal state, entering the detection channel 51 of the receiving mechanism 5. The sensor detects parameters such as the number and position of the sealing rings. Qualified products are automatically collected by the double receiving bin unit 52, and defective products are collected from the discharge end of the detection channel 51 after the baffle 511 is opened. After the valve stem of one hopper of the dual hopper unit 21 is taken out, the pusher plate 25 transfers the empty pallet to the other hopper. The staff continuously replenishes the pallet with the valve stem into the hopper, realizing the cyclical automated assembly of the equipment.

[0062] In summary, the automatic valve stem sealing ring assembly equipment provided by this invention has the following technical advantages: 1. Through the coordinated operation of various mechanisms, the entire process of sealing ring feeding, alignment, and expansion, valve stem feeding and posture adjustment, precise assembly of sealing rings and valve stems, and finished product inspection and sorting is fully automated. This effectively improves the assembly efficiency and accuracy of valve stem sealing rings, reduces manual labor intensity, and each unit of the equipment can be adapted to valve stems and sealing rings of different specifications, making it highly versatile and suitable for mass production operations.

[0063] 2. By precisely matching the height of the expansion needle and receiving tube with the valve stem sealing ring groove, and through the dual positioning of the guide unit and clamping unit, the sealing ring and valve stem are accurately assembled, effectively avoiding problems such as missing parts, multiple parts, and misalignment. The expansion device adopts a double-layer tube structure to achieve uniform expansion of the sealing ring, avoiding tensile damage to the sealing ring during assembly, improving the airtightness of the finished solenoid valve, and significantly improving the product qualification rate and consistency.

[0064] 3. The pressing mechanism has adjustable sliding grippers inside the pressing tube, which can be used to fit sealing rings of different outer diameters; the height of the expanding needle and receiving tube can be adjusted according to the position of the valve stem sealing ring groove, which can meet the assembly requirements of valve stems and sealing rings of different specifications. The equipment has a wide range of applications and does not require separate customization.

[0065] 4. The valve stem feeding mechanism adopts a dual-hopper structure, which can realize automatic transfer of empty trays and support batch feeding of multiple trays; the timing of each mechanism is precisely coordinated through the control system, the operation process is continuous and there is no interruption or waiting, the equipment has good operating stability, and it is suitable for large-scale industrial production.

[0066] 5. The receiving mechanism is equipped with sensors and openable and closable material stops to realize automatic detection of finished product assembly quality and automatic classification and collection of qualified and defective products. No manual inspection and screening is required, which further improves production efficiency and facilitates subsequent statistics and analysis of defective products.

[0067] The embodiments described above merely illustrate implementation methods of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. An automatic assembly device for valve stem sealing rings, characterized in that, The system includes a sealing ring feeding mechanism (1), a valve stem feeding mechanism (2), an expansion device (3), and an assembly mechanism (4). The sealing ring feeding mechanism (1) aligns the sealing rings and sequentially transports them to the picking position on the valve stem. The valve stem feeding mechanism (2) picks up the valve stem that needs to be fitted with a sealing ring and transports it to the assembly mechanism (4). The expansion device (3) picks up, expands, and transports the sealing rings aligned by the sealing ring feeding mechanism (1) to the assembly mechanism (4). The assembly mechanism (4) assembles the sealing rings onto the corresponding positions on the valve stem. Among them, the expansion device (3) includes a transfer mechanism (34), the transfer mechanism (34) includes a liftable support plate and a number of receiving pipes (345) installed on the support plate, the receiving pipes (345) include an inner tube fixed to the support plate and an outer tube slidably sleeved on the inner tube; The assembly mechanism (4) includes a mounting platform (41), a valve stem pushing unit (42), a guide plate (43), a clamping unit (44), a guiding unit (45), and a conveying unit (46). The valve stem pushing unit (42) is installed on one side of the mounting platform (41) to push the valve stem provided by the valve stem feeding mechanism (2) to the mounting platform (41) in the longitudinal direction. The guide plate (43) is fixed on the mounting platform (41) in the longitudinal direction to receive the valve stem pushed by the valve stem pushing unit (42) and to support the movement of the valve stem. The clamping unit (44) includes retractable clamping plates disposed opposite to each other on both sides of the guide plate (43), and the two clamping plates are provided with a number of wide slots opposite each other for clamping the valve stem; The guide unit (45) is laterally disposed on one side of the guide plate (43) for pushing the valve stem from the valve stem push unit (42) onto the guide plate (43); The feeding unit (46) includes a feeding plate (465), which is longitudinally and laterally mounted on the other side of the guide plate (43) and is opposite to the guiding unit (45). The feeding plate (465) has several clamping grooves evenly spaced on the edge of the plate facing the guiding unit (45) so that when the valve stem of the guiding unit (45) is pushed out from the valve stem pushing unit (42) onto the guide plate (43), the valve stem is simultaneously pushed into the clamping groove on the feeding plate (465). The valve stem is driven forward by the longitudinal movement of the feeding plate (465). When the bottom end of the valve stem is clamped by the lateral movement, the feeding plate (465) is separated from the valve stem so that the sealing ring on the receiving pipe (345) is pressed down onto the valve stem.

2. The automatic assembly equipment for valve stem sealing rings according to claim 1, characterized in that, The valve stem pushing unit (42) includes a storage seat (421) and a pusher plate (423). The storage seat (421) is fixed to the side of the top of the mounting platform (41), and a pusher groove is provided at its top. The pusher plate (423) is slidably installed in the pusher groove. A vertical rod groove (4231) is provided on the pusher plate (423) so that the valve stem feeding mechanism (2) can place the valve stem upright in the vertical rod groove (4231).

3. The automatic assembly equipment for valve stem sealing rings according to claim 2, characterized in that, The guiding unit (45) includes a transversely movable guide plate (452). The guide plate (452) forms a guide end face (4521) on the side facing the feeding plate (465). An anti-cavity groove is provided on one end of the guide end face (4521) adjacent to the storage seat (421). A push block (4523) is formed on one side of the anti-cavity groove. The push block (4523) is used to push the valve stem out from the upright groove (4231) of the push plate (423).

4. The automatic assembly equipment for valve stem sealing rings according to claim 2, characterized in that, A discharge port (4522) is provided at one end of the guide end face (4521) away from the storage seat (421) for the valve stem to fall down after assembly.

5. The automatic assembly equipment for valve stem sealing rings according to claim 1, characterized in that, The feeding unit (46) includes a longitudinal slide rail (461), a cylinder frame (462), and a transverse push cylinder (464). The longitudinal slide rail (461) is fixed longitudinally on the top surface of the mounting platform (41). The cylinder frame (462) is slidably mounted on the longitudinal slide rail (461). The feeding plate (465) is slidably mounted on the cylinder frame (462) and driven to move laterally by the transverse push cylinder (464).

6. The automatic assembly equipment for valve stem sealing rings according to claim 1, characterized in that, The expansion device (3) includes a material support mechanism (32), which includes a material support seat (320) and an expansion needle (323) erected on the material support seat (320). The expansion needle (323) includes a cylindrical section and a conical section integrally formed on the upper end of the cylindrical section.

7. The automatic assembly equipment for valve stem sealing rings according to claim 6, characterized in that, The transfer mechanism (34) includes a lifting mechanism, which includes a push tube (346) and a push tube cylinder (347). The push tube (346) is sleeved on the cylindrical section of each expansion needle (323), and the push tube cylinder (347) is used to push the push tube (346) up and down.

8. The automatic assembly equipment for valve stem sealing rings according to claim 1, characterized in that, The transfer mechanism (34) includes a material transfer mechanism, which includes a translation frame (342), a material removal cylinder (344) and several material receiving pipes (345). The material taking cylinder (343) is fixed on the translation frame (342). The piston end of the material taking cylinder (343) is vertically downward and connected to the bearing plate. The material removal cylinder (344) is installed on the bearing plate and its telescopic end is connected to the outer tube of the material receiving pipe (345).

9. The automatic assembly equipment for valve stem sealing rings according to claim 1, characterized in that, It includes a receiving mechanism (5), which is installed at the discharge end of the assembly mechanism (4) and is used to transport and inspect the assembled valve stem.

10. An assembly method for an automatic valve stem sealing ring assembly device as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Sealing ring feeding preparation: The sealing ring feeding mechanism (1) arranges the sealing rings and sends them to the preset material picking position in sequence; S2, Valve stem feeding mechanism (2) for feeding and adjusting the posture of the valve stem; S3, sealing ring material taking and expansion: the expansion device (3) takes the sealing ring from the material taking position of the sealing ring feeding mechanism (1), expands the sealing ring, and transfers the expanded sealing ring to the transfer mechanism (34). S4. Install the sealing ring onto the valve stem on the assembly mechanism (4); the valve stem feeding mechanism (2) transports the valve stem to the assembly mechanism (4); The guide unit (45) pushes the valve stem from the valve stem push unit (42) onto the guide plate (43) and simultaneously pushes it into the clamping groove on the feed plate (465). Then the feed plate (465) moves longitudinally, driving the valve stem forward one position. The clamping unit (44) starts to clamp the bottom end of the valve stem. Then the feed plate (465) and the guide unit (45) are reset. The transfer mechanism (34) operates, pressing the sealing ring on the receiving pipe (345) down onto the valve stem; The clamping unit (44) is released, and the guiding unit (45) pushes the next valve rod from the valve rod pushing unit (42) onto the guide plate (43) and simultaneously pushes it into the clamping groove on the feeding plate (465). The feeding plate (465) moves longitudinally, driving the next valve rod forward one position. The above cycle drives the valve stem to move in a step-by-step manner.

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