Pre-unloading valve core structure of prefill valve

Abstract

The invention discloses a preunloading valve element structure of a prefill valve, and relates to the technical field of valve element structures, the preunloading valve element structure of the prefill valve comprises a valve shell mechanism, a valve seat mechanism is arranged in the valve shell mechanism, an oil port mechanism is arranged at the top end of the valve shell mechanism, and an external connection mechanism is arranged on the left side of the valve shell mechanism. The valve seat body is in sliding fit with the valve shell mechanism, and the mounting plate is rotationally connected with a sub-groove of the bolt, so that all the components can be independently disassembled and assembled and are accurately positioned, the on-site overhaul difficulty is reduced, a double-elastic compensation mechanism of the self-absorption spring and the reset spring optimizes the action sensitivity and the return reliability of the valve element, the clamping stagnation risk is reduced, and the service life of the valve element is prolonged. The sliding collaborative design of the control piston and the valve cover enhances the response speed and stability of hydraulic control, a modular installation mechanism formed by the clamping block, the clamping plate and the side block is combined with the anti-skid treatment of the soft cushion and the pinching cushion, the rapid locking and anti-loosening functions are achieved, and the high-frequency vibration working condition is adapted.

Description

Technical Field

[0001] This invention relates to the field of valve core structure technology, specifically to a pre-unloading valve core structure for a filling valve. Background Technology

[0002] A pre-charge valve is a high-flow-rate hydraulically controlled check valve widely used in presses requiring high-pressure holding. In large hydraulic systems (such as various presses), a pressure-holding circuit is typically designed. Systems with this circuit often have a large pressure-holding cylinder. To improve efficiency, the cylinder needs to be filled quickly, necessitating a high instantaneous flow rate to rapidly transfer oil from the tank to the cylinder. This is often achieved using a pre-charge valve. Additionally, the pre-charge valve also provides pressure holding and rapid pressure relief functions.

[0003] The commonly used pre-charge valve is the disc pre-charge valve, which mainly consists of a small oil cylinder, piston, spring, butterfly valve, and control oil circuit. Its principle is as follows: control oil enters the small oil cylinder through the control oil circuit, causing the butterfly valve to open, achieving high-flow-rate filling and unloading. When the butterfly valve closes, pressure is maintained. The small oil cylinder is fixed by multiple bolts. When control oil is added, the piston moves downward, opening the butterfly valve and allowing for high-flow-rate circulation.

[0004] However, the existing pre-unloading valve core structure of the filling valve has the following shortcomings:

[0005] 1) Traditional filling valves typically use an integrated cast valve body and a rigidly fixed valve core structure, which has obvious functional limitations. The rigid connection means that the valve core cannot be replaced individually after wear, and the whole valve must be scrapped, resulting in serious waste of resources. The lack of elastic buffer design makes the valve core susceptible to impact damage when the fluid pressure changes suddenly, shortening the service life. The single spring reset mechanism is difficult to cope with dynamic load changes under complex working conditions, often resulting in return lag or overtravel. The installation process relies on precise alignment, and on-site debugging is time-consuming and prone to sealing failure due to stress concentration.

[0006] 2) Traditional external connection mechanisms mostly use rigid flanges or threaded direct connection methods, which have inherent limitations. Their fixed connection lacks axial and radial compensation capabilities. Thermal expansion and contraction of pipelines or mechanical vibration can easily cause leakage at the interface. Single plane seals rely on precision machining to ensure that even small deformations in actual working conditions can lead to seal failure. During maintenance, the pipeline must be completely disassembled to replace damaged parts, which is cumbersome and can easily cause secondary damage.

[0007] 3) Its rigid sealing design lacks axial and radial compensation capabilities. Small deformations caused by pipeline vibration or temperature gradient will directly damage the sealing interface, leading to continuous leakage. Most of the seals are non-adjustable, and on-site debugging requires repeated grinding and calibration, which is time-consuming and easily introduces secondary damage. When the medium contains particulate impurities, the hard sealing surface is prone to scratches, accelerating the sealing failure process.

[0008] Therefore, we propose a pre-unloading valve core structure for the filling valve to solve the problems mentioned above. Summary of the Invention

[0009] The purpose of this invention is to provide a pre-discharge valve core structure for a filling valve, which improves the assembly flexibility and maintenance convenience of the filling valve. The sliding fit between the valve seat body and the valve shell mechanism, and the slotted rotational connection between the mounting plate and the bolts, allow each component to be independently disassembled and precisely positioned, reducing the difficulty of on-site maintenance. The dual elastic compensation mechanism of the self-priming spring and the return spring optimizes the sensitivity of the valve core movement and the reliability of its return, reducing the risk of jamming. The sliding and coordinated design of the control piston and the valve cover enhances the response speed and stability of the hydraulic control. The modular installation mechanism composed of the locking block, locking plate, and side block, combined with the anti-slip treatment of the soft pad and the pinch pad, realizes the functions of quick locking and anti-loosening, adapting to high-frequency vibration conditions, thereby solving the problems mentioned in the background art.

[0010] To achieve the above objectives, the present invention provides the following technical solution: a pre-unloading valve core structure for a filling valve, comprising a valve housing mechanism, a valve seat mechanism disposed inside the valve housing mechanism, an oil port mechanism disposed at the top of the valve housing mechanism, an external connection mechanism disposed on the left side of the valve housing mechanism, and an installation mechanism disposed on the right side of the valve housing mechanism.

[0011] The valve seat mechanism includes a valve seat body, on which an mounting plate A and a bolt A are fixedly installed, and a valve stem is provided inside the valve seat body. On the surface of the valve stem, a positioning nut, a self-priming spring, and a valve core body are fixedly installed, and a return spring and a spring cover are provided at the top of the valve seat body.

[0012] The oil port mechanism includes a valve cover, the bottom end of which is provided with a mounting plate B and a bolt B, and the inside of the valve cover is provided with a fixing plate and a control piston.

[0013] The external connection mechanism includes an external connecting pipe, and a mounting plate C and a bolt C are fixedly installed on the right side of the external connecting pipe;

[0014] The installation mechanism includes a locking block, a locking plate on the surface of the locking block, a pressure block, a top plate, and a side block on the top of the locking plate, a fixing block and a locking rod fixedly installed on the surface of the side block, and a side cover fixedly installed on the surface of the locking rod.

[0015] Preferably, the valve housing mechanism includes a valve body, with an inlet valve port at the bottom end of the valve body and an outlet valve port on the left side of the valve body.

[0016] Preferably, the valve seat body is slidably connected to the valve housing mechanism via the receiving groove B, the mounting plate A is slidably connected to the valve housing mechanism via the receiving groove A, the bolt A is rotatably connected to the valve housing mechanism via the fixing groove A, the bolt A is rotatably connected to the mounting plate A via the through groove A, the valve seat body has an inlet port inside, the valve stem is slidably connected to the valve seat body via the sliding groove, the self-priming spring is slidably connected to the valve stem, the valve stem is slidably connected to the valve core body via the sliding groove, the bottom end of the valve stem is provided with a threaded rod, the threaded rod is rotatably connected to the valve stem via the threaded groove, the return spring is slidably connected to the positioning nut, and the spring cover is slidably connected to the valve housing mechanism.

[0017] Preferably, a boss is fixedly installed at the top of the valve housing mechanism, the valve cover is slidably connected to the boss, the bolt B is rotatably connected to the valve housing mechanism through the fixing groove B, the bolt B is rotatably connected to the mounting plate B through the through groove B, a connecting pipe is fixedly installed at the top of the valve cover, the fixing plate is slidably connected to the valve cover, and the control piston is slidably connected to the valve housing mechanism.

[0018] Preferably, the bolt C is rotatably connected to the valve housing mechanism via the fixing groove C, and the bolt C is rotatably connected to the mounting plate C via the through groove C.

[0019] Preferably, the card plate is slidably connected to the card block via an installation groove, side plates are fixedly installed at both ends of the card plate, and positioning grooves are formed on the surface of the side plates. The pressure block is slidably connected to the card plate via the installation groove, the top plate is slidably connected to the card plate, the side blocks are slidably connected to the card plate, a card pad is fixedly installed at the top of the fixing block, the card rod is slidably connected to the fixing block via card groove B, the card rod is slidably connected to the card plate via card groove A, a soft pad is fixedly installed at the top of the card rod, and a pinch pad is fixedly installed on the surface of the side cover.

[0020] Preferably, a retaining ring is fixedly installed on the surface of the outer tube, a positioning pad is fixedly installed on the surface of the retaining ring, a connecting rod is fixedly installed on the surface of the retaining ring, a connecting plate is fixedly installed on the surface of the connecting rod, a fixing ring is provided on the surface of the retaining ring, and an outer plate is fixedly installed on the surface of the fixing ring.

[0021] Preferably, the positioning pads are evenly distributed on the surface of the retaining ring, the fixing ring is rotatably connected to the retaining ring, the fixing ring is rotatably connected to the positioning pads, the connecting rod is slidably connected to the fixing ring through a groove, the connecting rod is rotatably connected to the fixing ring through a rotating groove A, and the connecting plate is rotatably connected to the fixing ring through a rotating groove B.

[0022] Preferably, a sealing gasket A is fixedly installed at the bottom end of the valve housing mechanism, a sealing gasket B is fixedly installed at the top end of the valve housing mechanism, a sealing gasket C is fixedly installed on the left side of the valve housing mechanism, a sealing groove is provided on the left side of the valve housing mechanism, and a sealing plate is fixedly installed on the right side of the outer pipe.

[0023] Preferably, the sealing plate is slidably connected to the valve housing mechanism via a sealing groove.

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

[0025] 1. This invention improves the assembly flexibility and maintenance convenience of the filling valve by setting up a locking block, locking plate, mounting groove, side plate, positioning groove, locking groove A, pressure block, top plate, side block, fixing block, locking groove B, locking pad, locking rod, soft pad, side cover, and pinch pad. The sliding fit between the valve seat body and the valve shell mechanism, and the grooved rotational connection between the mounting plate and the bolts, allow each component to be independently disassembled and precisely positioned, reducing the difficulty of on-site maintenance. The dual elastic compensation mechanism of the self-priming spring and the return spring optimizes the sensitivity of the valve core movement and the reliability of return, reducing the risk of jamming. The sliding coordination design of the control piston and the valve cover enhances the response speed and stability of hydraulic control. The modular installation mechanism composed of the locking block, locking plate, and side block, combined with the anti-slip treatment of the soft pad and pinch pad, realizes the functions of quick locking and anti-loosening, adapting to high-frequency vibration conditions.

[0026] 2. This invention, by setting up a retaining ring, positioning pad, connecting rod, connecting plate, fixing ring, groove, rotating groove A, rotating groove B, and external plate, achieves multi-point support and fine-tuning functions, effectively offsetting assembly errors. The rotational connection between the fixing ring and the retaining ring, combined with the sliding-rotation compound motion of the connecting rod, allows the external pipe to flexibly cope with stress deviations under different working conditions, reducing the risk of local stress concentration. The rotating groove cooperation between the connecting plate and the fixing ring further enhances the spatial adaptability of the structure, ensuring that the fluid channel is always in the optimal state, improving the operational stability under complex working conditions, while simplifying the on-site commissioning process and significantly shortening equipment downtime.

[0027] 3. This invention improves the leak-proof performance and operational reliability of the filling valve by setting sealing gasket A, sealing gasket B, sealing gasket C, sealing groove and sealing plate. The sealing gaskets A, B and C arranged circumferentially in the valve body mechanism form a multi-layer barrier, which can effectively block the medium penetration path from different directions. The sliding fit between the sealing plate at the outer pipe end and the sealing groove of the valve body can absorb the deformation caused by assembly errors and thermal expansion and contraction, and can also maintain the continuous contact of the sealing surface through relative movement. It also reduces the risk of sealing failure caused by vibration or impact, and facilitates quick disassembly and maintenance, reducing the frequency of downtime for maintenance. Attached Figure Description

[0028] Figure 1This is a perspective view of the main structure of a pre-unloading valve core structure for a filling valve according to the present invention;

[0029] Figure 2 This is an exploded front perspective view of the valve housing mechanism in the pre-unloading valve core structure of a filling valve according to the present invention.

[0030] Figure 3 This is an exploded perspective view of the valve housing mechanism in the pre-unloading valve core structure of a filling valve according to the present invention.

[0031] Figure 4 This invention relates to a pre-unloading valve core structure for a filling valve. Figure 3 Enlarged 3D view of the structure at point A in the middle;

[0032] Figure 5 This is an exploded front perspective view of the valve seat mechanism in the pre-unloading valve core structure of a filling valve according to the present invention;

[0033] Figure 6 This is an exploded bottom perspective view of the valve seat mechanism in the pre-unloading valve core structure of a filling valve according to the present invention;

[0034] Figure 7 This is an exploded side perspective view of the external mechanism in the pre-unloading valve core structure of a filling valve according to the present invention.

[0035] Figure 8 This invention relates to a pre-unloading valve core structure for a filling valve. Figure 7 Enlarged 3D view of the structure at point B in the middle;

[0036] Figure 9 This is an exploded perspective view of the external mechanism in the pre-unloading valve core structure of a filling valve according to the present invention.

[0037] In the diagram: 1. Valve housing mechanism; 101. Valve body; 102. Inlet valve port; 103. Outlet valve port; 2. Valve seat mechanism; 201. Receiving groove A; 202. Receiving groove B; 203. Fixing groove A; 204. Valve seat body; 205. Mounting plate A; 206. Through groove A; 207. Bolt A; 208. Inlet; 209. Sliding groove; 210. Valve stem; 211. Threaded groove; 2 12. Threaded rod; 213. Locating nut; 214. Self-priming spring; 215. Valve core body; 216. Slide groove; 217. Return spring; 218. Spring cover; 3. Oil port mechanism; 301. Boss; 302. Fixing groove B; 303. Valve cover; 304. Mounting plate B; 305. Through groove B; 306. Bolt B; 307. Connecting pipe; 308. Fixing plate; 309. Control piston; 4. External mechanism; 401. Fixing groove C; 402. External pipe; 403. Mounting plate C; 404. Through groove C; 405. Bolt C; 5. Mounting mechanism; 501. Clamping block; 502. Clamping plate; 503. Mounting groove; 504. Side plate; 505. Locating groove; 506. Clamping groove A; 507. Pressure block; 508. Top plate; 509. Side block; 510. Fixing block; 51 1. Slot B; 512. Slot pad; 513. Slot rod; 514. Soft pad; 515. Side cover; 516. Pinch pad; 6. Snap ring; 7. Positioning pad; 8. Connecting rod; 9. Connecting plate; 10. Fixing ring; 11. Groove; 12. Rotary groove A; 13. Rotary groove B; 14. External plate; 15. Sealing gasket A; 16. Sealing gasket B; 17. Sealing gasket C; 18. Sealing groove; 19. Sealing plate. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Please see the appendix Figure 1 - Appendix Figure 9 As shown, the present invention provides a technical solution: a pre-unloading valve core structure for a filling valve, including a valve housing mechanism 1, a valve seat mechanism 2 is provided inside the valve housing mechanism 1, an oil port mechanism 3 is provided at the top of the valve housing mechanism 1, an external connection mechanism 4 is provided on the left side of the valve housing mechanism 1, and an installation mechanism 5 is provided on the right side of the valve housing mechanism 1.

[0040] Example 1, according to Figures 1-7 , Figure 9As shown, the valve seat mechanism 2 includes a valve seat body 204. A mounting plate A205 and bolt A207 are fixedly mounted on the surface of the valve seat body 204. A valve stem 210 is disposed inside the valve seat body 204. A positioning nut 213, a self-priming spring 214, and a valve core body 215 are fixedly mounted on the surface of the valve stem 210. A return spring 217 and a spring cover 218 are disposed at the top of the valve seat body 204. The oil port mechanism 3 includes a valve cover 303. A mounting plate B304 and bolt B306 are disposed at the bottom of the valve cover 303. A fixing plate 308 and a control piston 309 are disposed inside the valve cover 303. The external connection mechanism 4 includes an external pipe 402. A mounting plate C403 and bolt C405 are fixedly mounted on the right side of the external pipe 402. The mounting mechanism 5 includes... The valve housing mechanism 1 includes a valve body 101. The valve body 101 has an inlet valve 102 at its bottom and an outlet valve 103 on its left side. A valve seat body 204 is slidably connected to the valve housing mechanism 1 via a receiving groove B202. A mounting plate A205 is slidably connected to the valve housing mechanism 1 via a receiving groove A201. A bolt A207 is rotatably connected to the valve housing mechanism 1 via a fixing groove A203. The bolt A207 is rotatably connected to the valve housing mechanism 1 via a through groove A206. The valve seat body 204 is rotatably connected to the mounting plate A205. An inlet 208 is provided inside the valve seat body 204. The valve stem 210 is slidably connected to the valve seat body 204 via a sliding groove 209. A self-priming spring 214 is slidably connected to the valve stem 210. The valve stem 210 is slidably connected to the valve core body 215 via a sliding groove 216. A threaded rod 212 is provided at the bottom end of the valve stem 210. The threaded rod 212 is rotatably connected to the valve stem 210 via a threaded groove 211. A return spring 217 is slidably connected to the positioning nut 213. A spring cover 218 is slidably connected to the valve housing mechanism 1. A boss 301 is fixedly installed at the top of the valve housing mechanism 1. A valve cover 303 is slidably connected to the boss 301. Bolt B306 passes through a fixing groove B302. The valve cover 303 is rotatably connected to the valve housing mechanism 1. Bolt B306 is rotatably connected to the mounting plate B304 through the through groove B305. A connecting pipe 307 is fixedly installed on the top of the valve cover 303. The fixing plate 308 is slidably connected to the valve cover 303. The control piston 309 is slidably connected to the valve housing mechanism 1. Bolt C405 is rotatably connected to the valve housing mechanism 1 through the fixing groove C401. Bolt C405 is rotatably connected to the mounting plate C403 through the through groove C404. The clamping plate 502 is slidably connected to the clamping block 501 through the mounting groove 503. Side plates 504 are fixedly installed on both ends of the clamping plate 502. The surface of the side plate 504 is provided with positioning grooves 505. The pressure block 507 is slidably connected to the clamping plate 502 through the mounting groove 503.The top plate 508 is slidably connected to the clamping plate 502, the side block 509 is slidably connected to the clamping plate 502, a clamping pad 512 is fixedly installed on the top of the fixing block 510, the clamping rod 513 is slidably connected to the fixing block 510 through the clamping groove B511, the clamping rod 513 is slidably connected to the clamping plate 502 through the clamping groove A506, a soft pad 514 is fixedly installed on the top of the clamping rod 513, and a pinching pad 516 is fixedly installed on the surface of the side cover 515.

[0041] The overall effect of Embodiment 1 is as follows: Through modular slide rail design such as storage groove A201, storage groove B202, sliding groove 209 and multi-directional sliding pair, precise positioning and rapid assembly / disassembly of valve seat body 204 and valve shell mechanism 1 are achieved, significantly improving assembly efficiency. The dual spring system of self-priming spring 214 + return spring 217 is used to control the movement of valve stem 210. Combined with the threaded rod 212 fine-tuning mechanism, the valve opening and closing response is sensitive and the stroke is controllable. The innovative multi-stage sliding guide structure of slide groove 216, slot A506, slot B511 and mounting groove is set. 503 effectively reduces motion friction loss and extends service life. The linkage locking device of the locking block 501-pressure block 507-top plate 508, together with the soft pad 514 and pinch pad 516 buffer design, ensures a stable connection and avoids metal fatigue. Each bolt assembly forms a rotating pair through the through groove and the fixed groove, which allows necessary deformation compensation while ensuring structural rigidity and improving system adaptability. The overall layout is compact. Each functional module oil port mechanism 3, external mechanism 4, and installation mechanism 5 are independent yet coordinated, which facilitates maintenance and upgrades. It is especially suitable for fluid control scenarios under complex working conditions.

[0042] Example 2, according to Figure 1 , Figures 7-9 As shown, a retaining ring 6 is fixedly installed on the surface of the outer tube 402, a positioning pad 7 is fixedly installed on the surface of the retaining ring 6, a connecting rod 8 is fixedly installed on the surface of the retaining ring 6, a connecting plate 9 is fixedly installed on the surface of the connecting rod 8, a fixing ring 10 is provided on the surface of the retaining ring 6, an outer plate 14 is fixedly installed on the surface of the fixing ring 10, the positioning pad 7 is evenly distributed on the surface of the retaining ring 6, the fixing ring 10 is rotatably connected to the retaining ring 6, the fixing ring 10 is rotatably connected to the positioning pad 7, the connecting rod 8 is slidably connected to the fixing ring 10 through the groove 11, the connecting rod 8 is rotatably connected to the fixing ring 10 through the rotating groove A12, and the connecting plate 9 is rotatably connected to the fixing ring 10 through the rotating groove B13.

[0043] The overall effect of Embodiment 2 is as follows: the circumferential distribution of the positioning pad 7 achieves force balance, and the combination of the sliding of the dual-degree-of-freedom motion groove 11 of the connecting rod 8 and the rotation of the rotating groove A12 and the rotation of the rotating groove B13 of the connecting plate 9 enables the external pipe 402 to have multi-dimensional spatial adjustment capability, which can accurately adapt to the pipeline docking requirements under different working conditions. The rotational pair between the fixed ring 10 and the retaining ring 6 effectively absorbs assembly errors and reduces forced stress. The synergistic effect of the positioning pad 7 and the fixed ring 10 forms a self-locking mechanism, which significantly improves the connection reliability. The modular design of the retaining ring 6 component supports quick disassembly and assembly, and each motion pair adopts a low-friction pairing form, which greatly reduces the amount of wear after long-term use. Overall, the external connection mechanism 4 achieves high adaptability, high stability and long service life.

[0044] Example 3, according to Figures 1-3 , Figure 9 As shown, a sealing gasket A15 is fixedly installed at the bottom of the valve housing mechanism 1, a sealing gasket B16 is fixedly installed at the top of the valve housing mechanism 1, a sealing gasket C17 is fixedly installed on the left side of the valve housing mechanism 1, a sealing groove 18 is provided on the left side of the valve housing mechanism 1, and a sealing plate 19 is fixedly installed on the right side of the outer pipe 402. The sealing plate 19 is slidably connected to the valve housing mechanism 1 through the sealing groove 18.

[0045] The overall effect of Embodiment 3 is as follows: a fully enveloping sealing barrier is formed by the sealing gaskets A1515, B1616, and C1717 arranged in three directions at the bottom, top, and left sides. Combined with the sliding fit between the sealing plate 1919 on the right side of the external pipe 402402 and the valve body sealing groove 1818, zero-gap sealing under dynamic working conditions is achieved. The sliding pair design of the sealing groove 1818 and the sealing plate 1919 can automatically compensate for assembly deviations and thermal deformation, ensuring no leakage during long-term operation. The multi-level redundant sealing structure effectively blocks the medium from penetrating along the axial, radial, and normal paths of the valve body 101101, significantly improving the sealing reliability under high pressure differential scenarios. The modular sealing components support rapid maintenance and replacement, and each sealing surface is paired with low-friction materials, greatly reducing the wear risk during opening and closing operations. Overall, a dual breakthrough in sealing performance and service life is achieved.

[0046] The working principle of the entire device is as follows: Before use, the pipeline is first fixed to the top of the valve cover 303 through the connecting pipe 307, and then the output pipe is fixed to the surface of the outer plate 14. Then, the fixing ring 10 is aligned with the outer pipe 402 and pushed towards the retaining ring 6, so that the connecting plate 9 on the surface of the connecting rod 8 passes through the groove 11 through the fixing ring 10. Then, it is rotated so that the connecting plate 9 rotates inside the fixing ring 10 through the rotating groove B13, and the connecting rod 8 rotates inside the fixing ring 10 through the rotating groove A12. At this time, the fixing ring 10 can be fixed to the surface of the retaining ring 6 by the positioning pad 7. Finally, the retaining plate 502 is placed in the position to be fixed, and the mounting mechanism 5 is firmly fixed by the side plate 504 and the positioning groove 505. Then, the valve shell mechanism 1 is... Pick up the card block 501 and align it with the mounting slot 503, then press it down. This allows the card block 501 to slide downwards through the mounting slot 503 at the top of the card plate 502. Once the card block 501 is fully inserted into the card plate 502 through the mounting slot 503, it is ready. Next, pinch the top plate 508 and align the pressure block 507 with the card plate 502, then press it down. This allows the top plate 508 to slide downwards along with the side block 509. Once the pressure block 507 is fully inserted into the card plate 502, it is ready. Then, pinch the pinch pad 516 and the side cover 515, align the card lever 513 with the card slot B511, and press it inwards. This allows the card lever 513 to slide the soft pad 514 through the card slot B511 completely into the fixed block 510, and then slide it into the card slot A506. Inside plate 502, when side cover 515 slides completely into the surface of fixing block 510 via pad 512, pressure block 507 can be firmly fixed inside plate 502. During use, sealing plate 19 installed inside valve housing mechanism 1 via sealing groove 18 provides better sealing. Sealing gaskets A15, B16, and C17 also provide better sealing. In subsequent use, fixing plate 308 drives control piston 309 to slide downwards, and spring cover 218 to slide downwards, causing return spring 217 to slide downwards. When spring cover 218 drives valve stem 210 to slide downwards, valve stem 210 drives valve core body 215 to slide downwards, and positioning nut 213... The self-priming spring 214 slides downwards together. When the valve core body 215 moves away from the valve seat body 204, liquid can flow into the valve body 101 through the inlet port 208 and the inlet valve port 102, and flow out of the valve body 101 through the outlet valve port 103 and the external pipe 402. For later maintenance, first rotate bolt C405, allowing it to rotate outwards from inside the valve body 101 through the fixing groove C401. Once bolt C405 is completely rotated out of the valve body 101 through the fixing groove C401, the external mechanism 4 can be removed from the left side of the valve housing mechanism 1 through the through groove C404 from inside the mounting plate C403. After the external mechanism 4 is disengaged from the sealing gasket C17, bolt B306 can then be rotated.Rotate bolt B306 outward through the fixing groove B302 inside the valve body 101. Once bolt B306 is completely rotated out of the valve body 101 through the fixing groove B302, the oil port mechanism 3 can be removed from the top of the valve housing mechanism 1 by passing it through the through groove B305 from inside the mounting plate B304. Once the valve cover 303 is disengaged from the sealing gasket B16 and the top of the boss 301, the valve is removed. Finally, rotate bolt A207 outward through the fixing groove A203 inside the valve body 101. Once bolt A207 is completely rotated out of the valve body 101 through the fixing groove A203, the valve seat mechanism 2 can be removed from the valve housing mechanism by passing it through the through groove A206 from inside the mounting plate A205. Remove the bottom end of valve seat 2. Once valve seat mechanism 2 is disengaged from sealing gasket A15, pull valve seat body 204 downwards. This allows valve seat body 204 to slide downwards inside valve body 101 via receiving groove B202, and mounting plate A205 to slide downwards inside valve body 101 via receiving groove A201. Once completely disengaged, rotate threaded rod 212. This allows threaded rod 212 to rotate downwards inside valve stem 210 via threaded groove 211. Once threaded rod 212 is completely rotated out of valve stem 210 via threaded groove 211, valve stem 210 can be removed from inside valve seat body 204 via sliding groove 209 and from valve core body 215 via sliding groove 216 for maintenance.

[0047] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pre-unloading valve core structure for a filling valve, characterized in that: It includes a valve housing mechanism (1), a valve seat mechanism (2) is provided inside the valve housing mechanism (1), an oil port mechanism (3) is provided at the top of the valve housing mechanism (1), an external connection mechanism (4) is provided on the left side of the valve housing mechanism (1), and an installation mechanism (5) is provided on the right side of the valve housing mechanism (1). The valve seat mechanism (2) includes a valve seat body (204), on which an mounting plate A (205) and a bolt A (207) are fixedly installed. A valve stem (210) is provided inside the valve seat body (204), and a positioning nut (213), a self-priming spring (214), and a valve core body (215) are fixedly installed on the surface of the valve stem (210). A return spring (217) and a spring cover (218) are provided at the top of the valve seat body (204). The oil port mechanism (3) includes a valve cover (303), the bottom end of which is provided with a mounting plate B (304) and a bolt B (306), and the inside of the valve cover (303) is provided with a fixing plate (308) and a control piston (309); The external connection mechanism (4) includes an external pipe (402), and an mounting plate C (403) and a bolt C (405) are fixedly installed on the right side of the external pipe (402); The installation mechanism (5) includes a locking block (501), a locking plate (502) is provided on the surface of the locking block (501), a pressure block (507) and a top plate (508) and a side block (509) are provided on the top of the locking plate (502), a fixing block (510) and a locking rod (513) are fixedly installed on the surface of the side block (509), and a side cover (515) is fixedly installed on the surface of the locking rod (513).

2. The pre-unloading valve core structure of the filling valve according to claim 1, characterized in that: The valve housing mechanism (1) includes a valve body (101), with an inlet valve port (102) at the bottom end of the valve body (101) and an outlet valve port (103) on the left side of the valve body (101).

3. The pre-unloading valve core structure of the filling valve according to claim 1, characterized in that: The valve seat body (204) is slidably connected to the valve housing mechanism (1) through the receiving groove B (202). The mounting plate A (205) is slidably connected to the valve housing mechanism (1) through the receiving groove A (201). The bolt A (207) is rotatably connected to the valve housing mechanism (1) through the fixing groove A (203). The bolt A (207) is rotatably connected to the mounting plate A (205) through the through groove A (206). The valve seat body (204) has an inlet (208) inside. The valve stem (210) is connected to the valve housing mechanism (1) through the sliding groove (209). The valve stem (210) is slidably connected to the valve seat body (204), the self-priming spring (214) is slidably connected to the valve stem (210), the valve stem (210) is slidably connected to the valve core body (215) through the slide groove (216), the bottom end of the valve stem (210) is provided with a threaded rod (212), the threaded rod (212) is rotatably connected to the valve stem (210) through the threaded groove (211), the return spring (217) is slidably connected to the positioning nut (213), and the spring cover (218) is slidably connected to the valve housing mechanism (1).

4. The pre-unloading valve core structure of the filling valve according to claim 1, characterized in that: A boss (301) is fixedly installed on the top of the valve housing mechanism (1). The valve cover (303) is slidably connected to the boss (301). The bolt B (306) is rotatably connected to the valve housing mechanism (1) through the fixing groove B (302). The bolt B (306) is rotatably connected to the mounting plate B (304) through the through groove B (305). A connecting pipe (307) is fixedly installed on the top of the valve cover (303). The fixing plate (308) is slidably connected to the valve cover (303). The control piston (309) is slidably connected to the valve housing mechanism (1).

5. The pre-unloading valve core structure of the filling valve according to claim 1, characterized in that: The bolt C (405) is rotatably connected to the valve housing mechanism (1) through the fixing groove C (401), and the bolt C (405) is rotatably connected to the mounting plate C (403) through the through groove C (404).

6. The pre-unloading valve core structure of the filling valve according to claim 1, characterized in that: The card plate (502) is slidably connected to the card block (501) through the mounting groove (503). Side plates (504) are fixedly installed at both ends of the card plate (502). Positioning grooves (505) are formed on the surface of the side plates (504). The pressure block (507) is slidably connected to the card plate (502) through the mounting groove (503). The top plate (508) is slidably connected to the card plate (502). The side block (509) is slidably connected to the card plate (501). The fixed block (510) is slidably connected to the fixed block (510) through the slot B (511), and the fixed block (512) is fixedly installed with a pad (512) at the top. The locking rod (513) is slidably connected to the fixed block (510) through the slot B (511), and the locking rod (513) is slidably connected to the locking plate (502) through the slot A (506). The locking rod (513) is fixedly installed with a soft pad (514) at the top. The side cover (515) is fixedly installed with a pinch pad (516) on its surface.

7. The pre-unloading valve core structure of the filling valve according to claim 1, characterized in that: A retaining ring (6) is fixedly installed on the surface of the outer tube (402), a positioning pad (7) is fixedly installed on the surface of the retaining ring (6), a connecting rod (8) is fixedly installed on the surface of the retaining ring (6), a connecting plate (9) is fixedly installed on the surface of the connecting rod (8), a fixing ring (10) is provided on the surface of the retaining ring (6), and an outer plate (14) is fixedly installed on the surface of the fixing ring (10).

8. The pre-unloading valve core structure of the filling valve according to claim 7, characterized in that: The positioning pad (7) is evenly distributed on the surface of the retaining ring (6). The fixing ring (10) is rotatably connected to the retaining ring (6). The fixing ring (10) is rotatably connected to the positioning pad (7). The connecting rod (8) is slidably connected to the fixing ring (10) through the groove (11). The connecting rod (8) is rotatably connected to the fixing ring (10) through the rotating groove A (12). The connecting plate (9) is rotatably connected to the fixing ring (10) through the rotating groove B (13).

9. The pre-unloading valve core structure of the filling valve according to claim 1, characterized in that: A sealing gasket A (15) is fixedly installed at the bottom of the valve housing mechanism (1), a sealing gasket B (16) is fixedly installed at the top of the valve housing mechanism (1), a sealing gasket C (17) is fixedly installed on the left side of the valve housing mechanism (1), a sealing groove (18) is provided on the left side of the valve housing mechanism (1), and a sealing plate (19) is fixedly installed on the right side of the outer pipe (402).

10. The pre-unloading valve core structure of the filling valve according to claim 9, characterized in that: The sealing plate (19) is slidably connected to the valve body mechanism (1) through the sealing groove (18).

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