Valve rod mounting structure, needle valve and gluing system

Abstract

The utility model relates to the technical field of valve bodies, in particular to a valve rod installation structure, a needle valve and a gluing system.The valve rod installation structure comprises a valve body, a valve rod, a first sealing piece, a first pressing sleeve and an adjusting mechanism, the valve body is provided with a glue passing hole and an installation hole communicated with the glue passing hole, and the valve rod is arranged in the installation hole and the glue passing hole in a penetrating mode; the first sealing piece is arranged at the position, close to the glue passing hole, of the mounting hole and arranged on the outer side of the valve rod in a sleeving mode. The end, close to the glue passing hole, of the mounting hole is provided with a stopping structure used for stopping the first sealing piece from moving towards the glue passing hole. The first pressing sleeve is arranged in the mounting hole and sleeves the outer side of the valve rod; the adjusting mechanism is used for driving the first pressing sleeve to move in the direction of the stop structure so that the first pressing sleeve can compress the first sealing piece. The observation opening is formed in the hole wall of the mounting hole, whether leaked glue exists on the outer side of the valve rod or not can be observed through the observation opening, the glue can be prevented from leaking at the first sealing piece, and the gluing quality is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of valve bodies, in particular to a valve stem mounting structure, a needle valve and a glue coating system. Background Art

[0002] In order to ensure the quality of glue coating during the gluing operation, quantitative glue feeding is required. The existing quantitative glue coating device is provided with a quantitative chamber. The feed port of the quantitative chamber is connected to a valve body for introducing glue into the quantitative chamber. The discharge port of the quantitative chamber is connected to the glue coating head. The quantitative glue coating device is also provided with a pushing mechanism. When the return mechanism is working, the valve body is closed, and the return mechanism pushes the glue in the quantitative chamber to the glue coating head. When the pushing mechanism is reset, the valve body opens, thereby allowing the glue to enter the quantitative chamber.

[0003] The existing valve bodies mostly use needle valves, which include a valve body with a glue hole. The valve body is provided with a glue outlet and a glue inlet, and both the glue inlet and the glue outlet are connected to the glue hole. The glue inlet or the glue outlet can be blocked by moving the valve stem. When the valve stem blocks the glue outlet or the glue inlet, the valve body is closed, and when the valve stem does not block the glue inlet and the glue outlet, the valve body is open. In order to prevent the glue in the glue hole from flowing out, a sealing ring needs to be set between the glue hole and the needle valve. However, for high-viscosity liquids, a large glue delivery pressure needs to be set during the glue injection process. A large glue delivery pressure can easily cause the glue to leak at the sealing ring. The glue leakage will affect the glue delivery amount and have an adverse effect on the glue coating amount. Utility Model Content

[0004] The technical problem to be solved by the utility model is that in the existing valve body, the glue liquid easily leaks at the sealing ring between the glue hole and the valve stem, which has an adverse effect on the glue coating quality.

[0005] In order to solve the above technical problems, the purpose of the utility model is to provide a valve stem installation structure, including:

[0006] A valve body, the valve body having a glue hole and a mounting hole connected to the glue hole;

[0007] A valve stem, the valve stem being inserted into the mounting hole and the glue hole;

[0008] A first sealing member, wherein the first sealing member is arranged at a position of the mounting hole close to the glue hole and sleeved on the outer side of the valve stem, and a stopping structure for stopping the first sealing member from moving toward the glue hole is provided at one end of the mounting hole close to the glue hole;

[0009] A first pressing sleeve, wherein the first pressing sleeve is arranged in the mounting hole and the first pressing sleeve is sleeved on the outer side of the valve stem;

[0010] an adjusting mechanism, the adjusting mechanism being used to drive the first pressing sleeve to move in the direction of the stopping structure so that the first pressing sleeve compresses the first sealing member;

[0011] The hole wall of the mounting hole is provided with an observation port, and the observation port is arranged toward the portion of the valve stem located above the first pressing sleeve.

[0012] As a preferred solution, the adjustment mechanism includes an internal thread arranged at the hole wall of the mounting hole, and an external thread arranged on the outside of the first pressing sleeve, and the internal thread is threadably matched with the external thread.

[0013] As a preferred solution, a wrench portion is provided on the outer side of the first pressing sleeve.

[0014] As a preferred embodiment, the tightening portion is a polygonal columnar structure arranged on the outside of the first pressing sleeve, the aperture of the mounting hole is larger than the outer diameter of the polygonal columnar structure, and the observation port forms an operating port for a tightening tool to enter the mounting hole to tighten the tightening portion.

[0015] As a preferred solution, the valve body includes an upper valve seat and a lower valve seat, and the upper valve seat and the lower valve seat are detachably connected;

[0016] The mounting hole includes a first countersunk hole provided at the lower portion of the upper valve seat and a second countersunk hole provided at the upper portion of the lower valve seat;

[0017] The glue hole is arranged at the lower part of the lower valve seat and is connected with the second countersunk hole. The second countersunk hole is arranged at the bottom of the upper valve seat. The first sealing member and the first pressure sleeve are both arranged in the second countersunk hole. The observation port is arranged at the hole wall of the first countersunk hole.

[0018] As a preferred embodiment, the hole wall of the second countersunk hole is inserted into the first countersunk hole, a positioning groove is provided on the outer side of the hole wall of the second countersunk hole, a locking screw is threaded in the hole wall of the first countersunk hole, and the threaded end of the locking screw passes through the hole wall of the first countersunk hole and is inserted into the positioning groove.

[0019] As a preferred embodiment, a threaded hole coaxially arranged with the valve stem is provided at the upper end of the first pressing sleeve, a second sealing member is provided in the threaded hole, the second sealing member is sleeved on the outside of the valve stem, a stopping protrusion for stopping the second sealing member from moving downward is provided at the bottom of the threaded hole, a second pressing sleeve is threadedly connected to the outside of the valve stem, and the lower end of the second pressing sleeve abuts against the second sealing member.

[0020] As a preferred solution, the first sealing member includes a first rubber ring and a first gasket, and the stopping structure, the first rubber ring, the first gasket and the first pressing sleeve are arranged in sequence along the axial direction of the valve stem.

[0021] A needle valve comprises the valve stem mounting structure mentioned above.

[0022] A glue coating system comprises the above-mentioned needle valve, a high-pressure glue supply device and a glue coating device, wherein the discharge port of the high-pressure glue supply device is connected to the feed port of the needle valve, and the discharge port of the needle valve is connected to the glue feed port of the glue coating device.

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] The valve stem mounting structure of the utility model comprises a valve body, a valve stem, a first sealing member, a first pressing sleeve and an adjusting mechanism, the valve body having a glue hole and a mounting hole connected to the glue hole, the valve stem being inserted in the mounting hole and the glue hole; the first sealing member is arranged at the mounting hole near the glue hole and is sleeved on the outside of the valve stem, and one end of the mounting hole near the glue hole is provided with a stopping structure for stopping the first sealing member from moving in the direction of the glue hole; the first pressing sleeve is arranged in the mounting hole, the first pressing sleeve is sleeved on the outside of the valve stem and one end of the first pressing sleeve near the stopping structure abuts against the first sealing member; the adjusting mechanism is used to drive the first pressing sleeve to move in the direction of the stopping structure so that the first pressing sleeve compresses the first sealing member; moving the first pressing sleeve by the adjusting mechanism can cause the first pressing sleeve to compress the first sealing member. After the first sealing member is compressed, its aperture becomes smaller, thereby tightening the valve stem and improving the sealing effect of the first sealing member on the valve stem; moreover, an observation port is provided on the hole wall of the mounting hole, and the observation port is arranged toward the portion of the valve stem located above the first pressing sleeve. When the position of the first pressing sleeve is adjusted by the adjusting mechanism, it can be observed through the observation port whether there is leaked glue on the outside of the valve stem, so that the operator can accurately adjust the position of the first pressing sleeve, thereby avoiding sealing failure caused by too low a pressure on the first sealing member and excessive friction between the first sealing member and the valve stem caused by too high a pressure on the first sealing member, thereby affecting the normal movement of the valve stem; therefore, the valve stem mounting structure of the utility model can avoid leakage of glue at the first sealing member and ensure the quality of glue coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an axonometric view of the valve body of the utility model;

[0026] Figure 2 It is a side view of the valve body of the utility model;

[0027] Figure 3 It is a bottom view of the valve body of the utility model;

[0028] Figure 4 for Figure 1 Cross-section at AA;

[0029] In the figure, 1, valve body, 11, glue hole, 12, mounting hole, 121, stop structure, 13, observation port, 14, upper valve seat, 141, first countersunk hole, 142, air inlet, 15, lower valve seat, 151, second countersunk hole, 2, valve stem, 21, ball head, 31, first sealing member, 311, first rubber ring, 312, first gasket, 32, first pressing sleeve, 321, twisting part, 33, second sealing member, 331, second rubber ring, 332, second gasket, 34, second pressing sleeve, 41, top cover, 42, upper cavity, 43, lower cavity, 43, piston, 44, compression spring, 5, locking screw. DETAILED DESCRIPTION

[0030] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0031] In the description of the present utility model, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. It should be understood that the terms "first", "second", etc. are used in the present utility model to describe various information, but such information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present utility model, the "first" information may also be referred to as the "second" information, and similarly, the "second" information may also be referred to as the "first" information.

[0032] like Figures 1 to 4 As shown, the valve stem mounting structure of the utility model is characterized by comprising:

[0033] A valve body 1, the valve body 1 having a glue hole 11 and a mounting hole 12 connected to the glue hole 11;

[0034] The valve stem 2 is inserted into the mounting hole 12 and the glue hole 11;

[0035] A first sealing member 31, which is arranged at a position of the mounting hole 12 close to the glue hole 11 and sleeved on the outer side of the valve stem 2, and a stopping structure 121 is provided at one end of the mounting hole 12 close to the glue hole 11 for stopping the first sealing member 31 from moving toward the glue hole 11;

[0036] A first pressing sleeve 32, which is disposed in the mounting hole 12, is sleeved on the outside of the valve stem 2, and one end of the first pressing sleeve 32 close to the stop structure 121 abuts against the first sealing member 31;

[0037] An adjusting mechanism, the adjusting mechanism is used to drive the first pressing sleeve 32 to move toward the stopping structure 121, so that the first pressing sleeve 32 compresses the first sealing member 31;

[0038] An observation port 13 is provided on the hole wall of the mounting hole 12 , and the observation port 13 is arranged toward the portion of the valve stem 2 located above the first pressing sleeve 32 .

[0039] Specifically, by moving the first pressing sleeve 32 through the adjustment mechanism, the first pressing sleeve 32 can compress the first sealing member 31. After the first sealing member 31 is compressed, its aperture becomes smaller, thereby tightening the valve stem 2 and improving the sealing effect of the first sealing member 31 on the valve stem 2; moreover, the hole wall of the mounting hole 12 is provided with an observation port 13, and the observation port 13 is arranged toward the portion of the valve stem 2 located above the first pressing sleeve 32. When the position of the first pressing sleeve 32 is adjusted by the adjustment mechanism, it can be observed through the observation port 13 whether there is any leaked glue on the outside of the valve stem 2, so that the operator can accurately adjust the position of the first pressing sleeve 32, thereby avoiding sealing failure caused by too low a pressure on the first sealing member 31, and avoiding excessive friction of the first sealing member 31 on the valve stem 2 caused by too high a pressure on the first sealing member 31, thereby affecting the normal movement of the valve stem 2; therefore, the valve stem mounting structure of the utility model can avoid leakage of glue at the first sealing member 31, thereby ensuring the quality of glue coating.

[0040] There are many ways to implement the adjustment structure, such as setting the mounting hole 12 larger, setting a boss on the inner wall of the mounting hole 12, setting a threaded hole on the boss, threading a push bolt in the threaded hole, and the end of the push bolt abutting against the pressing sleeve, and pushing the pressing sleeve to move in the direction of the stop structure 121 by screwing the push bolt. In this embodiment, the adjustment mechanism includes an internal thread set at the hole wall of the mounting hole 12, and an external thread set on the outer side of the first pressing sleeve 32, and the internal thread and the external thread are threaded together.

[0041] Furthermore, in order to facilitate the rotation of the pressing sleeve, a wrench portion 321 is provided on the outer side of the first pressing sleeve 32. Specifically, the wrench portion 321 is a polygonal columnar structure provided on the outer side of the first pressing sleeve 32, the aperture of the mounting hole 12 is larger than the outer diameter of the polygonal columnar structure, and the observation port 13 forms an operation port for a wrench tool to enter the mounting hole 12 to operate the wrench portion 321. Among them, the observation port 13 is relatively large, and the wrench tool is a wrench, which can enter the mounting hole 12 through the operation port and then be stuck on the outer side of the wrench portion 321 to achieve the wrench of the wrench portion 321.

[0042] To facilitate maintenance, in this embodiment, the valve body 1 includes an upper valve seat 14 and a lower valve seat 15, and the upper valve seat 14 and the lower valve seat 15 are detachably connected; the mounting hole 12 includes a first countersunk hole 141 arranged at the lower part of the upper valve seat 14 and a second countersunk hole 151 arranged at the upper part of the lower valve seat 15; the glue hole 11 is arranged at the lower part of the lower valve seat 15 and is connected to the second countersunk hole 151, the second countersunk hole 151 is arranged at the bottom of the upper valve seat 14, the first sealing member 31 and the first pressure sleeve 32 are both arranged in the second countersunk hole 151, and the observation port 13 is arranged at the hole wall of the first countersunk hole 141.

[0043] Specifically, the hole wall of the second counterbore 151 is inserted into the first counterbore 141, a positioning groove is provided on the outer side of the hole wall of the second counterbore 151, a locking screw 5 is screwed into the hole wall of the first counterbore 141, and the threaded end of the locking screw 5 passes through the hole wall of the first counterbore 141 and is inserted into the positioning groove. By screwing the locking screw 5, the lower valve seat 15 can be connected to the lower end of the upper valve seat 14, or the lower valve seat 15 can be removed from the lower end of the upper valve seat 14, thereby realizing the replacement of the elastic member.

[0044] In order to further improve the sealing effect of the valve stem 2, in this embodiment, the upper end of the first pressing sleeve 32 is provided with a threaded hole coaxially arranged with the valve stem 2, and a second sealing member 33 is provided in the threaded hole. The second sealing member 33 is sleeved on the outside of the valve stem 2, and a stop protrusion for stopping the second sealing member 33 from moving downward is provided at the bottom of the threaded hole. The outer side of the valve stem 2 is threaded with a second pressing sleeve 34, and the lower end of the second pressing sleeve 34 abuts against the second sealing member 33. The first sealing member 31 forms a first seal for the valve stem 2, and the second sealing member 33 forms a second seal for the valve stem 2, thereby ensuring the sealing effect of the valve stem 2.

[0045] The first sealing member 31 includes a first rubber ring 311 and a first gasket 312. The stopper structure 121, the first rubber ring 311, the first gasket 312 and the first pressing sleeve 32 are sequentially arranged along the axial direction of the valve stem 2. When the first pressing sleeve 32 is rotated, the friction between the lower end of the first pressing sleeve 32 and the first gasket 312 is smaller than the friction between the first gasket 312 and the first rubber ring 311. Therefore, when the first pressing sleeve 32 is rotated, the first pressing sleeve 32 and the first gasket 312 rotate relative to each other, and the first gasket 312 and the first rubber ring 311 remain fixed, thereby avoiding the first pressing sleeve 32 directly releasing the first gasket 311, which causes the first pressing sleeve 32 to wear the first gasket 311 when rotating.

[0046] In this embodiment, the second sealing member 33 includes a second rubber ring 331 and a second gasket 332 , and the stop protrusion, the second rubber ring 331 , the second gasket 332 and the second pressing sleeve 34 are arranged in sequence.

[0047] An embodiment of a needle valve comprises the above-mentioned valve stem mounting structure.

[0048] Specifically, in the present embodiment, the glue outlet of the valve body 1 is arranged on one side of the lower valve seat 15, and the feed port of the valve body 1 is arranged at the lower end of the lower valve seat 15, and is arranged opposite to the valve stem 2 in upper and lower directions; a ball head 21 is provided at the lower end of the valve stem 2, and the downward movement of the valve stem 2 can cause the ball head 21 to move downward and block the feed port, so that the valve body 1 is closed; the upward movement of the valve stem 2 can drive the ball head 21 to move upward, release the blockage of the ball head 21 on the feed port, and open the valve body 1. The upper valve seat 14 includes an upper valve seat 14 body and a top cover 41. The first countersunk hole 141 is arranged in the middle of the lower end of the upper valve seat 14 body. The upper end of the upper valve seat 14 body is provided with a third countersunk hole. The outer side of the hole wall of the third countersunk hole is provided with an external thread. The top cover 41 is threadedly connected to the outer side of the hole wall of the third countersunk hole. The top cover 41 and the hole wall of the third countersunk hole enclose a cylindrical sealing cavity. A piston 43 is provided in the third countersunk hole to slide up and down. The piston 43 divides the sealing cavity into an upper cavity 42 and a lower cavity 43. The upper end of the valve stem 2 is fixedly connected to the piston 43. A compression spring 44 is provided in the upper cavity 42. , the compression spring 44 applies a downward elastic force to the piston 43, and the cavity wall of the lower cavity 43 is provided with an air inlet 142. Compressed air is introduced into the air inlet 142. The compressed air pushes the piston 43 to move upward, so that the compression spring 44 is compressed and shortened. The upward movement of the piston 43 drives the valve stem 2 to move upward, and compresses the compression spring 44. The upward movement of the piston 43 drives the valve stem 2 to move upward, so that the valve body 1 opens; stop supplying air to the air inlet 142, and the piston 43 moves downward under the elastic force of the compression spring 44, driving the valve stem 2 to move downward, so that the ball head 21 blocks the glue inlet, thereby closing the valve body 1.

[0049] An embodiment of a glue coating system includes the above-mentioned needle valve, a high-pressure glue supply device and a glue coating device, wherein the discharge port of the high-pressure glue supply device is connected to the feed port of the needle valve, and the discharge port of the needle valve is connected to the glue feed port of the glue coating device.

[0050] In summary, the valve stem mounting structure of the utility model can move the first pressing sleeve 32 through the adjustment mechanism, so that the first pressing sleeve 32 can compress the first sealing member 31. After the first sealing member 31 is compressed, the aperture becomes smaller, thereby tightening the valve stem 2 and improving the sealing effect of the first sealing member 31 on the valve stem 2; moreover, the hole wall of the mounting hole 12 is provided with an observation port 13, and the observation port 13 is arranged toward the part of the valve stem 2 located above the first pressing sleeve 32. When the position of the first pressing sleeve 32 is adjusted by the adjustment mechanism, it can be observed through the observation port 13 whether there is leaked glue on the outside of the valve stem 2, so that the operator can accurately adjust the position of the first pressing sleeve 32, so as to avoid the sealing failure caused by the first sealing member 31 being under too little pressure, and to avoid the first sealing member 31 being under too much pressure. The friction force of the first sealing member 31 on the valve stem 2 is too large, so as to affect the normal movement of the valve stem 2; therefore, the valve stem mounting structure of the utility model can avoid the leakage of glue at the first sealing member 31, thereby ensuring the quality of glue coating.

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A valve stem mounting structure, characterized in that: include: A valve body (1), the valve body (1) having a glue hole (11) and a mounting hole (12) connected to the glue hole (11); A valve stem (2), wherein the valve stem (2) is inserted into the mounting hole (12) and the glue hole (11); A first sealing member (31), the first sealing member (31) being arranged at a position of the mounting hole (12) close to the glue hole (11) and sleeved on the outer side of the valve stem (2); a stopping structure (121) for stopping the first sealing member (31) from moving in a direction of the glue hole (11) is provided at one end of the mounting hole (12) close to the glue hole (11); A first pressing sleeve (32), wherein the first pressing sleeve (32) is arranged in the mounting hole (12), and the first pressing sleeve (32) is sleeved on the outside of the valve stem (2); an adjusting mechanism, the adjusting mechanism being used to drive the first pressing sleeve (32) to move in the direction of the stopping structure (121), so that the first pressing sleeve (32) compresses the first sealing member (31); The hole wall of the mounting hole (12) is provided with an observation port (13), and the observation port (13) is arranged toward the portion of the valve stem (2) located above the first pressing sleeve (32).

2. The valve stem mounting structure according to claim 1, characterized in that: The adjustment mechanism comprises an internal thread arranged at the hole wall of the mounting hole (12), and an external thread arranged on the outside of the first pressing sleeve (32), the internal thread being threadably matched with the external thread.

3. The valve stem mounting structure according to claim 2, characterized in that: A twisting portion (321) is provided on the outer side of the first pressing sleeve (32).

4. The valve stem mounting structure according to claim 3, characterized in that: The tightening portion (321) is a polygonal columnar structure arranged outside the first pressing sleeve (32); the diameter of the mounting hole (12) is larger than the outer diameter of the polygonal columnar structure; and the observation port (13) forms an operating port for a tightening tool to enter the mounting hole (12) to tighten the tightening portion (321).

5. The valve stem mounting structure according to claim 1, characterized in that: The valve body (1) comprises an upper valve seat (14) and a lower valve seat (15), and the upper valve seat (14) and the lower valve seat (15) are detachably connected; The mounting hole (12) comprises a first countersunk hole (141) arranged at the lower part of the upper valve seat (14) and a second countersunk hole (151) arranged at the upper part of the lower valve seat (15); The glue hole (11) is arranged at the lower part of the lower valve seat (15) and is connected to the second countersunk hole (151). The second countersunk hole (151) is arranged at the bottom of the upper valve seat (14). The first sealing member (31) and the first pressing sleeve (32) are both arranged in the second countersunk hole (151). The observation port (13) is arranged at the hole wall of the first countersunk hole (141).

6. The valve stem mounting structure according to claim 5, characterized in that: The hole wall of the second countersunk hole (151) is inserted into the first countersunk hole (141), and a positioning groove is provided on the outer side of the hole wall of the second countersunk hole (151). A locking screw (5) is screwed into the hole wall of the first countersunk hole (141), and the threaded end of the locking screw (5) passes through the hole wall of the first countersunk hole (141) and is inserted into the positioning groove.

7. The valve stem mounting structure according to claim 1, characterized in that: The upper end of the first pressing sleeve (32) is provided with a threaded hole coaxially arranged with the valve stem (2), and a second sealing member (33) is provided in the threaded hole. The second sealing member (33) is sleeved on the outer side of the valve stem (2), and a stopping protrusion for stopping the second sealing member (33) from moving downward is provided at the bottom of the threaded hole. The outer side of the valve stem (2) is threadedly connected with a second pressing sleeve (34), and the lower end of the second pressing sleeve (34) is in contact with the second sealing member (33).

8. The valve stem mounting structure according to claim 1, characterized in that: The first sealing member (31) comprises a first rubber ring (311) and a first gasket (312), and the retaining structure (121), the first rubber ring (311), the first gasket (312) and the first pressing sleeve (32) are arranged in sequence along the axial direction of the valve stem (2).

9. A needle valve, characterized in that: It includes the valve stem mounting structure according to any one of claims 1 to 8.

10. A gluing system, characterized in that: It comprises the needle valve, high-pressure glue supply device and glue coating device as claimed in claim 9, wherein the discharge port of the high-pressure glue supply device is connected with the feed port of the needle valve, and the discharge port of the needle valve is connected with the glue feed port of the glue coating device.

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