Dome type valve rod sealing charging gun

Abstract

The invention relates to the technical field of filling, in particular to a dome type valve rod sealing filling gun which comprises a material pipe, a valve rod, a plug and a sealing structure, the material pipe is in a hollow pipe shape and communicates with a material inlet, the valve rod is arranged in the material pipe in a penetrating mode and can do axial reciprocating motion, and the plug is fixed to the bottom of the valve rod and can plug an opening in the bottom end of the material pipe; the sealing structure comprises a cavity and a sealing component, the cavity is arranged above the material pipe and communicated with the material pipe, a fixed part of the sealing component is fixedly sealed with the inner wall of the cavity, and a movable part of the sealing component is fixedly arranged on the valve rod in a sleeving mode and generates controllable elastic deformation along with movement of the valve rod to form static sealing. Traditional sliding sealing is converted into a static sealing structure, the fixed part of the sealing component and the cavity are fixedly sealed, the movable part of the sealing component moves along with the valve rod, the sealing state is maintained by means of elastic deformation, sliding friction between the valve rod and the sealing ring is avoided fundamentally, and the sealing performance is improved. And the problem of sealing failure caused by abrasion of the sealing ring and scratching of the sealing ring by crystal particles is fundamentally solved.

Description

Technical Field

[0001] This application relates to the field of filling technology, and in particular to a dome-shaped valve stem sealing filling gun. Background Technology

[0002] In liquid filling processes in industries such as chemicals, the filling gun, as a key component for material conveying and filling, directly affects the safety and reliability of the filling operation through the sealing performance of its valve stem. Currently, the commonly used valve stem sealing structure in the industry is a sliding seal with a sealing ring. This structure has significant technical drawbacks: during the raising and lowering process, the valve stem experiences continuous sliding friction with the fixed sealing ring. Long-term friction leads to wear and aging of the sealing ring, resulting in poor sealing and material leakage. Furthermore, for chemical materials that easily crystallize or contain particulate impurities, these crystals or impurities adhere to the valve stem surface. When the valve stem rises and falls, these particles scratch the sealing surface of the sliding sealing ring, causing the sealing structure to fail rapidly and exacerbating the material leakage problem. Material leakage not only wastes raw materials and increases production costs, but also, due to the leakage of corrosive materials, can lead to equipment corrosion, personnel safety accidents, and environmental pollution, seriously affecting the continuity and safety of production operations. Therefore, developing a filling gun structure that can solve the defects of the sliding seal and improve sealing reliability has become a pressing technical challenge for those skilled in the art. Summary of the Invention

[0003] Therefore, the purpose of this invention is to provide a dome-shaped valve stem sealed filling gun, which uses a static sealing structure to replace the traditional sliding sealing structure, effectively improving the technical problem of material leakage caused by valve stem seal failure. The specific solution is as follows.

[0004] This invention provides a dome-shaped valve stem sealing filling gun, comprising:

[0005] The material pipe 100 is a hollow tubular structure that is connected to the material inlet;

[0006] The valve stem 200 is inserted inside the material pipe 100 and can reciprocate along the axial direction of the material pipe 100 under the action of external force;

[0007] The plug 300 is fixedly installed at the bottom of the valve stem 200 and moves synchronously with the valve stem 200. When the valve stem 200 moves upward along the axial direction of the material tube 100 to the limit position, the plug 300 can seal the bottom opening of the material tube 100.

[0008] The sealing structure includes a cavity 400 and a sealing member 500. The cavity 400 is located above the material tube 100, and its interior communicates with the top opening of the material tube 100. The sealing member 500 is located inside the cavity 400. The edge of the sealing member 500 is provided with a continuous radially outwardly extending circumferential edge as a fixing part 510. The main body of the sealing member 500 integrally connected to the inner side of the fixing part 510 serves as a moving part 520. The fixing part 510 is circumferentially closed and fixedly connected to the inner wall of the cavity 400. The moving part 520 is sleeved on the valve stem 200 and fixedly connected to the valve stem 200. It can change position relative to the fixing part 510 in the vertical direction under the axial movement of the valve stem 200.

[0009] Furthermore, when the position of the moving part 520 relative to the fixed part 510 changes in the vertical direction, the main body of the moving part 520 undergoes elastic deformation that adapts to the axial displacement of the valve stem 200.

[0010] Furthermore, after the movable part 520 is sleeved on the valve stem 200, a sealed and fixed connection between it and the valve stem 200 is achieved through the fixing component 600. The fixing component 600 includes a pressure block 610 and a base 620 distributed vertically on the valve stem 200. The connection portion between the movable part 520 and the valve stem 200 is clamped between the pressure block 610 and the base 620. The pressure block 610 and the base 620 clamp the movable part 520 along the axial direction of the valve stem 200, thereby achieving a sealed and fixed connection between the movable part 520 and the valve stem 200.

[0011] Furthermore, the sealing member 500 includes a rubber layer and a polytetrafluoroethylene layer stacked on top of each other.

[0012] Furthermore, the sealing member 500 also includes a fiber layer disposed between the rubber layer and the polytetrafluoroethylene layer.

[0013] Furthermore, the cavity 400 is an accommodating space formed by a detachably connected upper end cover 410 and a lower end cover 420. The upper end cover 410 and the lower end cover 420 cooperate to press the fixing part 510 tightly, thereby achieving a circumferentially sealed and fixed connection between the fixing part 510 and the inner wall of the cavity 400.

[0014] Furthermore, the edge of the fixing part 510 is provided with a continuous annular flange 511, and the outer side of the flange 511 is also provided with a continuous extension part 512 extending radially outward. The pressing surface of the upper end cover 410 and the lower end cover 420 is provided with a groove that can accommodate the flange 511. The flange 511 is interference-fitted with the groove, and the extension part 512 is pressed between the mating surfaces of the upper end cover 410 and the lower end cover 420.

[0015] Furthermore, the dome-shaped valve stem sealing filling gun also includes a limiting structure 700, which is used to limit the maximum displacement of the valve stem 200 moving axially downward within the material tube 100.

[0016] Furthermore, the dome-shaped valve stem sealing filling gun also includes a support member 800, which is disposed between the valve stem 200 and the inner wall of the feed tube 100 to limit the radial displacement of the valve stem 200.

[0017] Furthermore, the dome-shaped valve stem sealing filling gun also includes a spring 900, which is sleeved on the valve stem 200. When the valve stem 200 moves downward along the axial direction, the spring 900 is compressed.

[0018] The beneficial effects of this invention are as follows:

[0019] The present invention provides a dome-shaped valve stem sealing filling gun, which transforms the traditional sliding seal into a static sealing structure. The fixed part of the sealing component is fixedly sealed to the cavity, while its moving part moves with the valve stem and maintains the sealing state through elastic deformation. This fundamentally avoids sliding friction between the valve stem and the sealing ring, and essentially solves the problem of sealing failure caused by sealing ring wear or scratches from crystallized particles. It can effectively adapt to the filling operations of special materials such as those that are prone to crystallization, corrosive, or have high viscosity, and prevents material leakage.

[0020] The present invention provides a dome-shaped valve stem sealing filling gun, the main body of which adopts a composite structure of rubber layer and polytetrafluoroethylene layer, reinforced by a fiber layer in between, combining elasticity, wear resistance, corrosion resistance, and structural strength, making it resistant to damage and delamination. The cavity adopts a detachable upper and lower end cap structure, and with the design of the fixing component, it facilitates the connection, adjustment, and disassembly of the moving part and valve stem, and facilitates the disassembly, replacement, and maintenance of the sealing component; reducing maintenance difficulty and cost, extending the overall service life of the filling gun, reducing maintenance costs and replacement frequency, and improving production efficiency.

[0021] The present invention provides a dome-shaped valve stem sealing filling gun, which sets a limiting structure and a support component between the valve stem and the material tube to ensure smooth reciprocating motion of the valve stem without shaking and controllable displacement, avoiding damage to components due to excessive movement; and adopts a spring automatic reset structure to realize automatic sealing of the material gun when the machine stops, improving the continuity and safety of the filling operation. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 The image shows a front view of a dome-shaped valve stem sealing filling gun according to an exemplary embodiment.

[0024] Figure 2 for Figure 1 Sectional view at point AA.

[0025] Figure 3 This is a schematic diagram of the assembly of a sealing structure according to an exemplary embodiment.

[0026] Figure 4 for Figure 3 Sectional view at point BB.

[0027] Figure 5 This is a schematic diagram of the structure of a sealing member according to an exemplary embodiment.

[0028] Figure 6 This is a front view of a sealing member according to an exemplary embodiment.

[0029] Figure 7 for Figure 6 Sectional view at point CC.

[0030] Figure 8 This is a schematic diagram of the assembly of a sealing member according to an exemplary embodiment.

[0031] Figure 9 for Figure 8 Sectional view at point DD.

[0032] Figure 10 This is a cross-sectional view of a dome-shaped valve stem sealing filling gun according to another exemplary embodiment 2.

[0033] Figure 11 This is a cross-sectional view of a dome-shaped valve stem sealing filling gun according to another exemplary embodiment three.

[0034] Figure 12 for Figure 11 Enlarged view of a section at point E in the middle.

[0035] Figure 13 This is a cross-sectional view of a dome-shaped valve stem sealing filling gun according to another exemplary embodiment 4.

[0036] Figure 14 This is a cross-sectional view of a dome-shaped valve stem sealing filling gun according to another exemplary embodiment five.

[0037] In the above figure:

[0038] 100. Material pipe;

[0039] 200. Valve stem; 210. First section; 211. Threaded hole; 220. Second section; 221. Screw; 230. Limiting part;

[0040] 300. Blockade;

[0041] 400. Cavity; 410. Upper end cap; 420. Lower end cap;

[0042] 500. Sealing component; 5001. Rubber layer; 5002. Fiber layer; 5003. Polytetrafluoroethylene layer; 510. Fixing part; 511. Flange; 512. Extension part; 520. Moving part; 521. Boss; 522. Central through hole; 523. Second flange;

[0043] 600. Fixing component; 610. Pressure block; 620. Base;

[0044] 700. Limiting structure; 710. Limiting block; 720. Limiting step;

[0045] 800. Support component; 810. Fixed end; 820. Sliding end;

[0046] 900. Spring. Detailed Implementation

[0047] To better explain the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application. In some instances, methods, means, elements, and circuits well known to those skilled in the art are not described in detail in order to highlight the main points of this application. Similarly, for clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0048] Example 1

[0049] See Figures 1 to 9 This embodiment provides a dome-shaped valve stem sealing filling gun, including: a material tube 100, a valve stem 200, a plug 300, and a sealing structure. The sealing structure includes a cavity 400 and a sealing member 500. The cavity 400 is disposed above the material tube 100, and its interior communicates with the top opening of the material tube 100. The sealing member 500 is disposed inside the cavity 400.

[0050] The material pipe 100 is a hollow tubular structure and can be made of materials with corrosion resistance and high temperature resistance to adapt to various corrosive chemical materials and high temperature liquid filling scenarios; the material pipe 100 is connected to the material inlet to realize material transportation.

[0051] The valve stem 200 is inserted inside the material tube 100 and can reciprocate along the axial direction of the material tube 100 under the action of external force. Specifically, the top end of the valve stem 200 extends into the cavity 400 and is connected to an external drive mechanism, such as a cylinder or hydraulic cylinder, and can reciprocate vertically up and down along the axial direction of the material tube 100 under the drive of external force.

[0052] The plug 300 is fixedly installed at the bottom of the valve stem 200 and moves synchronously with the valve stem 200. When the valve stem 200 moves upward along the axial direction of the material pipe 100 to the limit position, the plug 300 can seal the bottom opening of the material pipe 100. The plug 300 realizes the opening and closing of the material outlet at the bottom of the material pipe 100 through reciprocating motion, thereby controlling the start and stop of the filling operation.

[0053] The cavity 400 is a receiving space enclosed by a detachably connected upper end cover 410 and a lower end cover 420. The upper end cover 410 and the lower end cover 420 are detachably connected by bolts in a flange-like connection manner. The lower end cover 420 is fixedly connected to and communicates with the top opening of the material tube 100, and the valve stem 200 can extend through the lower end cover 420 into the cavity 400.

[0054] The sealing member 500 has a continuous radially outwardly extending circumferential edge as a fixing part 510. The main body of the sealing member 500 integrally connected to the inner side of the fixing part 510 serves as a moving part 520. The fixing part 510 is circumferentially closed and fixedly connected to the inner wall of the cavity 400. The moving part 520 is sleeved on the valve stem 200 and fixedly connected to the valve stem 200. It can change position relative to the fixing part 510 in the vertical direction under the axial movement of the valve stem 200.

[0055] The fixing part 510 has an integrally formed circumferentially continuous annular flange 511 on its edge. An integrally formed circumferentially continuous extension 512 extending radially outward is also provided on the outer side of the flange 511. The upper end cap 410 and the lower end cap 420 cooperate to press the fixing part 510 together, thereby achieving a circumferentially sealed and fixed connection between the fixing part 510 and the inner wall of the cavity 400. Specifically, on the pressing surfaces of the upper end cap 410 and the lower end cap 420, corresponding annular grooves are provided to accommodate the flange 511. The flange 511 and the groove are interference-fitted, and the extension 512 is tightly fitted to the pressing surface, forming a double-sealing structure. This further improves the sealing performance between the fixing part 510 and the inner wall of the cavity 400, preventing material leakage.

[0056] When the position of the moving part 520 relative to the fixed part 510 changes in the vertical direction, the main body of the moving part 520 undergoes elastic deformation that adapts to the axial displacement of the valve stem 200. The moving part 520 is constructed as a dome-shaped thin-walled structure, with the main body being a smooth curved surface of uniform thickness. The curved surface is in the shape of a paraboloid of revolution, and the radius of curvature of the curved surface is designed according to the reciprocating stroke displacement of the valve stem 200 to ensure that the moving part 520 can undergo uniform elastic deformation when moving with the valve stem 200, avoiding damage caused by local stress concentration.

[0057] The movable part 520 has a central connecting structure, which includes a boss 521 and a central through hole 522 penetrating the boss 521. The top surface of the boss 521 is slightly higher than the main body of the movable part 520, and the edge of the boss 521 is rounded to reduce stress concentration. The central through hole 522 is adapted to the diameter of the valve stem 200. After the central through hole 522 is fitted onto the valve stem 200, a sealed and fixed connection between the central through hole 522 and the valve stem 200 is achieved by the fixing assembly 600.

[0058] The fixing assembly 600 includes a pressure block 610 and a base 620 distributed vertically on the valve stem 200. The moving part 520 is clamped between the pressure block 610 and the base 620 by a central connection structure of the valve stem 200. On the boss 521 of the moving part 520, a circumferentially continuous annular second flange 523 is provided on the outer periphery of the central through hole 522. Correspondingly, the bottom surface of the pressure block 610 and the top surface of the base 620 are provided with grooves that can accommodate the second flange 523, and the second flange 523 is interference-fitted with the grooves. The bottom surface of the pressure block 610 is in contact with the top surface of the moving part 520, and the top surface of the base 620 is in contact with the bottom surface of the moving part 520. The pressure block 610 and the base 620 clamp the moving part 520 along the axial direction of the valve stem 200, thereby achieving a sealed and fixed connection between the moving part 520 and the valve stem 200.

[0059] The valve stem 200 is constructed from top to bottom as a detachably connected first section 210 and a second section 220. The bottom surface of the first section 210 has a threaded hole 211, and the top of the second section 220 is integrally formed with a screw 221 that mates with the threaded hole 211. The pressure block 610 is fixedly mounted on the lower end of the first section 210 by welding, and the base 620 is also fixedly mounted on the upper end of the second section 220 by welding. The first section 210 and the second section 220 are connected by threads to achieve axial relative movement, driving... The pressure block 610 and the base 620 move closer to each other, clamping the moving part 520. Specifically, the first segment 210 and the second segment 220 achieve relative axial movement through the tightening or loosening of the threaded connection, thereby causing the pressure block 610 and the base 620 to move closer or further apart, realizing the adjustment of the clamping force of the moving part 520 and its disassembly and replacement; and the threaded connection between the first segment 210 and the second segment 220 has a self-locking function to prevent loosening of the connection from causing poor sealing between the moving part 520 and the valve stem 200.

[0060] In one specific embodiment, the sealing member 500 is a composite layer structure, comprising a rubber layer 5001 and a polytetrafluoroethylene layer 5003 stacked on top of each other, with the two layers tightly bonded together without gaps. The rubber layer 5001 is used to enhance the elasticity of the sealing member 500, and the polytetrafluoroethylene layer 5003 is used to improve the corrosion resistance and wear resistance of the sealing member 500, thereby extending the service life of the sealing member 500.

[0061] In another specific embodiment, the sealing member 500 further includes a fiber layer 5002 disposed between the rubber layer 5001 and the polytetrafluoroethylene layer 5003. The fiber layer 5002 can be glass fiber cloth or carbon fiber cloth, used to enhance the structural strength and tear resistance of the sealing member 500, preventing delamination, detachment, deformation, and tearing of the rubber layer 5001 and the polytetrafluoroethylene layer 5003, avoiding deformation, tearing, and other damage when the moving part 520 deforms, and preventing the sealing member 500 from failing to seal. The fiber layer 5002 can be bonded to the rubber layer 5001 by vulcanization, further improving the strength of the sealing member 500.

[0062] This embodiment provides the working process of a dome-type valve stem sealing filling gun:

[0063] When the filling operation is started, the external drive mechanism applies a driving force downward, causing the valve stem 200 to move vertically downward along the axis of the material tube 100. When the valve stem 200 moves vertically downward, the plug 300 at its bottom moves down synchronously with the valve stem 200, gradually disengaging from the bottom opening of the material tube 100. At this time, a stable material outlet is formed between the plug 300 and the bottom opening of the material tube 100, allowing the material to enter the filling container through the filling gun and start the filling operation. During this process, the moving part 520 of the sealing member 500 moves downward with the valve stem 200, undergoes a vertical position change relative to the fixed part 510, and produces uniform elastic deformation. Since the fixed part 510 is fixedly sealed with the cavity 400 and the moving part 520 is fixedly sealed with the valve stem 200, a static sealing system is formed, and the material will not leak from between the valve stem 200 and the sealing structure. At the same time, the dome-shaped smooth curved surface of the moving part 520 can prevent material crystallization and adhesion, ensuring stable sealing performance.

[0064] After the filling operation is completed, the external drive mechanism applies an upward driving force, causing the valve stem 200 to move vertically upward along the axis of the material tube 100. When the valve stem 200 moves vertically upward to its limit position, the plug 300 at its bottom moves upward synchronously with the valve stem 200, completely sealing the bottom opening of the material tube 100. At this time, a sealed space is formed between the plug 300 and the sealing member 500 inside the material tube 100. The corresponding pressure of the medium in the sealed space acts on the plug 300 and the sealing member 500 respectively. Since the sealing member 500 is set as a dome-shaped thin-walled structure with a smooth curved surface of uniform thickness, its force-bearing area is larger than that of the plug 300. Therefore, under the action of the medium pressure in the sealed space, the valve stem 200 has a tendency to move vertically upward, thereby lifting the plug 300 and sealing the bottom opening of the material tube 100 more tightly.

[0065] When maintenance or replacement of the sealing component 500 is required, remove the fixing bolts between the upper end cover 410 and the lower end cover 420, remove the upper end cover 410, and then loosen the threaded connection between the first section 210 and the second section 220 of the valve stem 200 so that the pressure block 610 and the base 620 are far apart, so that the sealing component 500 can be removed for maintenance or replacement. After replacement, place the fixing part 510 of the sealing component 500 into the groove of the lower end cover 420, tighten the first section 210 and the second section 220 of the valve stem 200 so that the pressure block 610 and the base 620 clamp the moving part 520, then cover the upper end cover 410 and tighten the fixing bolts to complete the maintenance and replacement. The operation is convenient.

[0066] Example 2

[0067] See Figure 1 , Figure 2 as well as Figure 10 This embodiment provides a dome-shaped valve stem sealing filling gun. Based on the first embodiment, the dome-shaped valve stem sealing filling gun further includes a limiting structure 700. The limiting structure 700 is used to limit the maximum displacement of the valve stem 200 moving axially downward within the material tube 100, so as to avoid the valve stem 200 moving downward excessively and to prevent damage to the plug 300 and the sealing member 500.

[0068] The limiting structure 700 includes a limiting block 710 fixedly disposed on the bottom surface of the base 620 and a limiting step 720 fixedly disposed on the inner wall of the cavity 400. When the valve stem 200 moves downward to its limit position, the limiting block 710 and the limiting step 720 abut against each other, restricting the valve stem 200 from continuing to move downward. At this time, a stable material outlet is formed between the plug 300 and the bottom opening of the material tube 100. The moving part 520 of the sealing member 500 moves downward with the valve stem 200, and its position changes vertically relative to the fixed part 510. It also produces a controllable and uniform elastic deformation according to a preset stroke. The fixed part 510 is fixedly sealed to the cavity 400, and the moving part 520 is fixedly sealed to the valve stem 200, forming a static sealing system.

[0069] Example 3

[0070] See Figure 1 , Figure 2 , Figure 11 as well as Figure 12 This embodiment provides a dome-shaped valve stem sealing filling gun. Based on the first embodiment, the dome-shaped valve stem sealing filling gun further includes a support member 800. The support member 800 is disposed between the valve stem 200 and the inner wall of the material tube 100 to limit the radial displacement of the valve stem 200, prevent the valve stem 200 from radially shaking or shifting during reciprocating motion, and ensure smooth movement and stable sealing performance of the valve stem 200.

[0071] In one specific embodiment, one end of the support member 800 is configured as a fixed end 810, which is fixedly connected to the valve stem 200; the other end of the support member 800 is configured as a sliding end 820, which abuts against or forms a clearance fit with the inner wall of the material tube 100. When the valve stem 200 moves vertically up and down in the axial direction within the material tube 100, the support member 800 moves synchronously with the valve stem 200; at this time, the sliding end 820 of the support member 800 maintains an abutment or clearance fit with the inner wall of the material tube 100 to ensure that the valve stem 200 does not generate radial displacement, or to control the radial displacement within a preset range.

[0072] Multiple support members 800 can be evenly distributed along the circumference of the valve stem 200, and multiple sets can be distributed along the axial direction of the valve stem 200 to ensure the support effect.

[0073] In one specific embodiment, a guide groove adapted to the sliding end 820 of the support member 800 can be formed axially on the inner wall of the material tube 100. Part of the outer peripheral surface of the sliding end 820 of the support member 800 is accommodated in the guide groove and can slide axially along the guide groove, thereby ensuring the stability of the axial movement of the valve stem 200.

[0074] Similarly, in another embodiment, the fixed end 810 of the support member 800 can also be fixedly connected to the material tube 100, and the sliding end 820 of the support member 800 abuts against or forms a clearance fit with the valve stem 200.

[0075] The sliding end 820 of the support member 800 may be made of polytetrafluoroethylene to enhance the wear resistance of the support member 800 and reduce wear on the inner wall of the material tube 100 or the valve stem 200.

[0076] The fixed end 810 and the sliding end 820 of the support member 800 are configured to be detachably connected. For example, the sliding end 820 can be sleeved on the fixed end 810 so that it can be quickly replaced when the sliding end 820 is worn, thereby ensuring the support effect.

[0077] In one specific embodiment, the sliding end 820 of the support member 800 is provided with a rolling component such as a ball or a roller to reduce the sliding friction resistance between the support member 800 and the inner wall of the valve stem 200 or the feed tube 100.

[0078] In another specific embodiment, the sliding end 820 of the support member 800 can also be constructed as an arc-shaped surface, which can also reduce the sliding friction resistance between the support member 800 and the inner wall of the valve stem 200 or the feed tube 100.

[0079] Example 4

[0080] See Figure 1 , Figure 2 as well as Figure 13 This embodiment provides a dome-shaped valve stem sealing filling gun. Based on the first embodiment, the dome-shaped valve stem sealing filling gun further includes a spring 900. The spring 900 is sleeved on the valve stem 200. When the valve stem 200 moves downward along the axial direction, the spring 900 is compressed and stores elastic potential energy. When the external force acting on the valve stem 200 is removed, the spring 900 elastically resets, causing the valve stem 200 to move upward automatically, so that the sealing plug 300 automatically seals the bottom opening of the material tube 100, realizing automatic reset sealing.

[0081] In one specific embodiment, the spring 900 is sleeved on the portion of the valve stem 200 extending upward out of the cavity 400, and its two ends are pressed between the cavity 400 and the limiting portion 230 provided on the side wall of the valve stem 200. When the external drive mechanism applies an external force to the valve stem 200 to move it downward, the valve stem 200 moves downward, at which time the spring 900 is compressed and stores elastic potential energy. After the filling operation is completed, the driving force applied by the external drive mechanism is removed, the spring 900 releases the stored elastic potential energy to elastically reset, and drives the valve stem 200 to move upward along the axial direction of the material tube 100 until the valve stem 200 moves upward to its limit position, so that the sealing plug 300 completely seals the bottom opening of the material tube 100. At this time, the spring 900 continues to push the valve stem 200 upward, so that the sealing plug 300 keeps in close contact with the inner wall of the bottom opening of the material tube 100.

[0082] Example 5

[0083] See Figure 1 , Figure 2 as well as Figures 11 to 14 This embodiment provides a dome-shaped valve stem sealing filling gun, which, based on embodiment one, also includes the limiting structure 700, support member 800, and spring 900 described in embodiments two, three, and four.

[0084] The specific structure, installation position, and working principle of the limiting structure 700, the support member 800, and the spring 900 are the same as those described in Embodiments 2, 3, and 4, and will not be repeated here.

[0085] The dome-shaped valve stem sealing filling gun provided in this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A dome stem seal caUng gun characterized by, include: The material pipe (100) is a hollow tubular structure that is connected to the material inlet; The valve stem (200) is inserted inside the material tube (100) and can reciprocate along the axial direction of the material tube (100) under the action of external force; A plug (300) is fixedly installed at the bottom of the valve stem (200) and moves synchronously with the valve stem (200). When the valve stem (200) moves upward along the axial direction of the material tube (100) to the limit position, the plug (300) can seal the bottom opening of the material tube (100). The sealing structure includes a cavity (400) and a sealing member (500); the cavity (400) is located above the material tube (100), and its interior is connected to the top opening of the material tube (100); the sealing member (500) is located inside the cavity (400), and the edge of the sealing member (500) is provided with a continuous radially outwardly extending circumferential edge as a fixed part (510), and the main body of the sealing member (500) integrally connected to the inner side of the fixed part (510) is a moving part (520). The fixed part (510) is circumferentially closed and fixedly connected to the inner wall of the cavity (400), and the moving part (520) is sleeved on the valve stem (200) and fixedly connected to the valve stem (200), and can change position relative to the fixed part (510) in the vertical direction under the axial movement of the valve stem (200).

2. A dome seal cartridge gun according to claim 1, wherein, When the position of the moving part (520) relative to the fixed part (510) changes in the vertical direction, the main body of the moving part (520) undergoes elastic deformation that matches the axial displacement of the valve stem (200).

3. A dome seal cartridge gun according to claim 1, wherein, After the movable part (520) is sleeved on the valve stem (200), a sealed and fixed connection between it and the valve stem (200) is achieved through a fixing component (600). The fixing component (600) includes a pressure block (610) and a base (620) distributed vertically on the valve stem (200). The connection between the movable part (520) and the valve stem (200) is clamped between the pressure block (610) and the base (620). The pressure block (610) and the base (620) clamp the movable part (520) along the axial direction of the valve stem (200), thereby achieving a sealed and fixed connection between the movable part (520) and the valve stem (200).

4. The dome-shaped valve stem sealing filling gun according to claim 1, characterized in that, The sealing member (500) includes a rubber layer and a polytetrafluoroethylene layer stacked on top of each other.

5. A dome-shaped valve stem sealing filling gun according to claim 4, characterized in that, The sealing member (500) further includes a fiber layer disposed between the rubber layer and the polytetrafluoroethylene layer.

6. A dome-shaped valve stem sealing filling gun according to claim 1, characterized in that, The cavity (400) is an accommodating space formed by a detachably connected upper end cover (410) and a lower end cover (420). The upper end cover (410) and the lower end cover (420) cooperate to press the fixing part (510) together, thereby achieving a circumferentially sealed and fixed connection between the fixing part (510) and the inner wall of the cavity (400).

7. A dome-shaped valve stem sealing filling gun according to claim 6, characterized in that, The edge of the fixing part (510) is provided with a continuous annular flange (511), and the outer side of the flange (511) is also provided with a continuous extension (512) extending radially outward. The pressing surface of the upper end cover (410) and the lower end cover (420) is provided with a groove that can accommodate the flange (511). The flange (511) is interference-fitted with the groove, and the extension (512) is pressed between the mating surfaces of the upper end cover (410) and the lower end cover (420).

8. A dome-shaped valve stem sealing filling gun according to claim 1, characterized in that, It also includes a limiting structure (700) for limiting the maximum displacement of the valve stem (200) moving axially downward within the feed tube (100).

9. A dome-shaped valve stem sealing filling gun according to claim 1, characterized in that, It also includes a support member (800) disposed between the valve stem (200) and the inner wall of the feed tube (100) for limiting the radial displacement of the valve stem (200).

10. A dome-shaped valve stem sealing filling gun according to claim 1, characterized in that, It also includes a spring (900) which is sleeved on the valve stem (200) and is compressed when the valve stem (200) moves axially downward.

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