A split-type pneumatic return valve

Abstract

This utility model belongs to the field of valve technology, and particularly relates to a split-type pin-type pneumatic reflux valve, including a valve seat and a cylinder. The valve seat has a first connector with threads along its axial direction. The cylinder has a first mounting seat with threads at one end along its axial direction. The valve seat and the cylinder are detachably connected by the first connector and the first mounting seat through the threaded connection. Through the detachable threaded connection structure between the valve seat and the cylinder, quick disassembly and maintenance can be achieved while ensuring sealing performance. This effectively solves the problems of high maintenance costs and difficult component replacement of traditional integrated valves, and has the advantages of easy maintenance and replacement, reduced operating costs, and reliable sealing performance.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and in particular relates to a split-type pin pneumatic reflux valve. Background Technology

[0002] A hot melt adhesive machine is a device that heats and melts solid adhesive while precisely controlling the amount of adhesive dispensed. It is widely used in industries such as packaging, electronics, and automotive. The reflux valve is a key component controlling the flow of adhesive, primarily used to prevent backflow and stabilize system pressure, ensuring uniform dispensing. It switches the adhesive path on and off mechanically or electromagnetically, directly affecting the equipment's operational stability and adhesive delivery accuracy.

[0003] Because the reflux valve is under high pressure and high temperature for a long time, the carbonization and accumulation of rubber material wears down the valve seat, and the high temperature causes the sealing ring inside the valve body to age, which easily leads to sealing leakage problems. Most of the existing reflux valves are integrated designs, but after their internal structure is damaged, it is inconvenient to disassemble and repair them, and a new reflux valve needs to be replaced, which increases the machine maintenance cost. Utility Model Content

[0004] The purpose of this utility model is to provide a split-type pneumatic return valve with a pin, which aims to solve the technical problems of inconvenience in disassembly and maintenance and reduce the cost of use in the prior art.

[0005] To achieve the above objectives, this utility model provides a split-type pneumatic return valve with a ejector pin, characterized in that: it includes a valve seat and a cylinder; one axial end of the valve seat is provided with a first interface portion and a glue inlet; the other axial end of the valve seat is provided with a first connector with threads; a through-type receiving cavity is provided inside the valve seat, and a first ejector pin is provided inside the receiving cavity; the end of the first ejector pin can block the glue inlet; the first ejector pin is slidably received in the receiving cavity along the axial direction; one axial end of the cylinder is provided with a first mounting seat, and the other axial end of the cylinder is provided with a second mounting seat with threads; the cylinder is provided with a piston chamber, a piston portion, and a cylinder body; a second ejector pin is slidably disposed inside the cylinder body; one end of the second ejector pin is fixedly connected to the piston portion; when the valve seat and the cylinder are connected, the other end of the second ejector pin extends into the receiving cavity and abuts against the tail of the first ejector pin; the valve seat and the cylinder are detachably threadedly connected to the first mounting seat via the first connector.

[0006] Furthermore, the first connector has an external thread, and the first mounting base has an internal thread.

[0007] Furthermore, the inner cavity of the first mounting base is provided with a retaining spring groove and an annular cavity. The retaining spring groove is provided with a retaining spring plate, and the annular cavity is provided with a sealing gasket and a sealing gasket pressure plate. The retaining spring plate is engaged in the retaining spring groove, and the sealing gasket and the sealing gasket pressure plate are pressed against the annular cavity by the retaining spring plate.

[0008] Furthermore, the first ejector pin is provided with a first guide portion in the radial direction. The first guide portion is located at the tail of the first ejector pin. The first guide portion includes a first guide member and a fourth sealing ring. The first guide portion abuts against the inner wall of the accommodating cavity and slides axially with the first ejector pin.

[0009] Furthermore, the first ejector pin is provided with a second guide member in the radial direction. The second guide member is located in the middle of the first ejector pin and abuts against the inner wall of the accommodating cavity, sliding axially with the first ejector pin.

[0010] Furthermore, the head of the first thimble is spherical or conical.

[0011] Furthermore, the first interface is provided with an adhesive inlet, an outer retaining ring, and a front retaining ring. The outer retaining ring forms an axial constraint with the first interface, and the outer retaining ring clamps and fixes the front retaining ring. The first interface is connected to the adhesive supply pipeline.

[0012] Furthermore, a reflux hole is provided above the first interface portion of the valve seat, and the reflux hole is connected to the reflux pipeline.

[0013] Furthermore, a second mounting platform is provided on the outside of the cylinder housing, and a pressure relief hole is provided on the second mounting platform.

[0014] Furthermore, the cylinder head has a second interface portion connected to the air source at one end along the axial direction, and a second connector at the other end along the axial direction. The second connector has an internal thread, and there is a cavity inside the cylinder head that communicates with the piston cavity. The second mounting seat of the cylinder has an external thread, and the cylinder head and the cylinder are detachably connected by the second connector and the second mounting seat.

[0015] As can be seen from the above, the split-type pneumatic reflux valve provided in this application achieves quick disassembly and maintenance while ensuring sealing performance through a detachable threaded connection structure between the valve seat and the cylinder. This effectively solves the problems of high maintenance cost and difficult component replacement of traditional integrated valves, and has the advantages of easy maintenance and replacement, reduced usage cost and reliable sealing performance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the reflux valve provided in Embodiment 1 of this utility model.

[0018] Figure 2This is a cross-sectional view of Embodiment 1 of the present invention.

[0019] Figure 3 for Figure 2 A magnified view of the local structure of A.

[0020] Figure 4 This is a cross-sectional view of Embodiment 2 of this utility model.

[0021] The following are the labeling elements in the figure:

[0022] 1. Valve seat; 11. First interface section; 111. Outer retaining ring; 112. Front retaining ring; 113. Glue inlet; 12. Receiving cavity; 131. Return hole; 132. First mounting section; 133. First mounting platform; 14. First ejector pin; 141. Second guide member; 142. First guide section; 15. First connector;

[0023] 2. Cylinder; 21. First mounting seat; 211. Snap ring groove; 212. Snap ring plate; 213. Sealing gasket pressure plate; 214. Sealing gasket; 215. Annular cavity; 22. Second ejector pin; 23. Cylinder body; 24. Second mounting platform; 241. Pressure relief hole; 25. Piston section; 251. Piston head; 252. Piston ring; 26. Second mounting seat; 27. Piston chamber;

[0024] 3. Cylinder head; 31. Second connector; 32. Cavity; 33. Second interface section;

[0025] 41. First sealing ring; 42. Second sealing ring; 43. Third sealing ring; 44. Fourth sealing ring; 45. Fifth sealing ring;

[0026] 5. Connector section. Detailed Implementation

[0027] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0028] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0031] In one embodiment of this utility model, reference is made to Figure 1-2 A split-type pneumatic return valve is provided, comprising a valve seat 1, a cylinder 2 and a cylinder head 3.

[0032] Combination Figure 2-3 As shown, the valve seat 1 has a first interface 11 at one axial end for connecting to the glue supply pipeline. The first interface 11 has a glue inlet 113 for glue inlet. A return hole 131 is provided above the first interface 11 for connecting to the return pipeline.

[0033] refer to Figure 2 Specifically, a first mounting part 132 is provided above the reflux hole 131 of the valve seat 1, and a first mounting platform 133 is provided above the first mounting part 132. The first mounting part 132 is threaded, and the valve seat 1 and the hot melt glue machine's glue supply system are connected by the first mounting part 132 to the mounting cavity of the glue supply system, thus realizing the connection between the pneumatic reflux valve and the hot melt glue machine's glue supply system. During maintenance, by rotating the first mounting platform 133, the first mounting platform 133 drives the thread at the first mounting part 132 to unscrew from the mounting cavity. When installation is required, by rotating the first mounting platform 133, the thread at the first mounting part 132 is screwed into the mounting cavity.

[0034] A second sealing ring 42 is provided at the connection between the valve seat 1 and the mounting cavity. Specifically, an annular cavity is recessed on the contact surface between the valve seat 1 and the mounting cavity, and the second sealing ring 42 is disposed in the annular cavity. When the valve seat 1 is connected to the mounting cavity, the second sealing ring 42 can make the connection surface more airtight.

[0035] Specifically, the first interface portion 11 of the valve seat 1 is provided with an outer retaining ring 111 and a front retaining ring 112. The outer retaining ring 111 forms an axial constraint with the first interface portion 11, and the outer retaining ring 111 clamps and fixes the front retaining ring 112. When the valve seat 1 is connected to the glue supply system of the hot melt glue machine, the first interface portion 11 is fixed in the mounting cavity of the glue supply system and connected to the glue supply pipeline. Specifically, the first interface portion 11 is connected to the glue supply pipeline in an abutting manner, and the glue enters the glue inlet 113 through the connection between the glue supply pipeline and the first interface portion 11.

[0036] Furthermore, a first sealing ring 41 can be provided at the first interface 11. After the first interface 11 is connected to the glue inlet pipe, the sealing performance of the connection surface can be strengthened by the first sealing ring 41.

[0037] Preferably, to match the shape of the mounting cavity of the hot melt glue machine's glue supply system, the valve seat 1 can be in the shape of a cylindrical shaft, a stepped shaft, a prism, etc.

[0038] refer to Figure 3 The valve seat 1 has a through-hole receiving cavity 12, and a first ejector pin 14 is provided in the receiving cavity 12. The first ejector pin 14 is slidably received in the receiving cavity 12 along the axial direction. The end of the first ejector pin 14 can block or open the glue inlet 113. Preferably, the head of the first ejector pin 14 is spherical or conical. The shape of the head of the first ejector pin 14 is not particularly limited as long as it can block the glue inlet 113.

[0039] To extend the service life of the first ejector pin 14, specifically, the first ejector pin 14 is provided with a first guide portion 142 radially. The first guide portion 142 is located at the tail of the first ejector pin 14 and abuts against the inner wall of the receiving cavity 12, sliding axially with the first ejector pin 14. More specifically, the first ejector pin 14 is provided with a second guide member 141 radially. The second guide member 141 is located in the middle of the first ejector pin 14 and abuts against the inner wall of the receiving cavity 12, sliding axially with the first ejector pin 14. The second guide member 141 and the first guide portion 142 cooperate with each other to share the radial pressure of the tail guide, preventing the first ejector pin 14 from bending and deforming.

[0040] To prevent the adhesive from leaking and contaminating the accommodating cavity 12 of the valve body 1, specifically, the first guide portion 142 of the first ejector pin 14 in the accommodating cavity 12 includes a first guide member and a fourth sealing ring 44. The first guide member is disposed at the tail of the first ejector pin 14 to form a radial constraint structure, and forms a sliding guide with a clearance fit with the inner wall of the accommodating cavity 12. After being deformed by pressure, the fourth sealing ring 44 adheres tightly to the cavity wall to form a dynamic sealing interface, and continuously compensates for the radial clearance during the sliding process of the first ejector pin 14.

[0041] Specifically, the valve seat 1 has a first connector 15 at one axial end, and the first connector 15 is threaded; the cylinder 2 has a first mounting seat 21 at one axial end, and the first mounting seat 21 is threaded, so that rotating the cylinder 2 can separate it from the valve seat 1 body. Preferably, the thread on the first connector 15 is an external thread, and the thread on the first mounting seat 21 is an internal thread. The valve seat 1 and the cylinder 2 are detachably threadedly connected via the first connector 15 and the first mounting seat 21.

[0042] In addition, in order to ensure the sealing of the valve seat 1 and the cylinder 2 at the threaded connection, a third sealing ring 43 is provided at the connection between the valve seat 1 and the cylinder 2. Specifically, an annular cavity is provided in the recess of the contact surface between the valve seat 1 and the cylinder 2, and the third sealing ring 43 is provided in the annular cavity. When the valve seat 1 and the cylinder 2 are connected, the sealing of the connection surface can be strengthened by the third sealing ring 43.

[0043] In this embodiment, the valve seat 1 and the cylinder 2 are connected by threads to form an integral valve body. During disassembly, the two parts can be separated simply by unscrewing the threads. The standardized threaded interface enables quick disassembly and assembly, effectively solving the problem of having to replace the entire valve body when there is partial damage, and reducing equipment downtime and maintenance costs.

[0044] Specifically, a second mounting seat 26 is provided at the other end of the cylinder 2 along its axial direction. The second mounting seat 26 is threaded. The cylinder 2 is provided with a piston chamber 27, a piston part 25, and a cylinder body 23. A second ejector pin 22 is slidably disposed in the cylinder body 23. One end of the second ejector pin 22 is fixedly connected to the piston part 25, and the other end of the second ejector pin 22 can extend into the receiving cavity 12 and abut against the tail of the first ejector pin 14 when the valve seat 1 is connected to the cylinder 2. Preferably, to ensure the accuracy of force transmission, the contact surfaces of the two ejector pins are processed by a planar grinding process. The two-stage ejector pin design can reduce the machining difficulty while ensuring the accuracy of action.

[0045] Furthermore, to ensure that the second ejector pin 22 accurately abuts against the tail of the first ejector pin 14 and to guarantee the sealing of the valve seat 1 and cylinder 2 at the threaded connection, the inner cavity of the first mounting base 21 of cylinder 2 is provided with a snap ring groove 211 and an annular cavity 215. The snap ring groove 211 is provided with a snap ring 212, and the annular cavity 215 is provided with a sealing gasket 214 and a sealing gasket pressure plate 213. The snap ring 212 is elastically engaged in the snap ring groove 211, and the sealing gasket 214 and the sealing gasket pressure plate 213 are pressed against the annular cavity 215 by the snap ring 212. The second ejector pin 22 extends through the middle of the sealing gasket 214 and the sealing gasket pressure plate 213 into the receiving cavity 12. The snap ring 212 restricts the axial displacement of the sealing gasket 214 and the sealing gasket pressure plate 213, so that the second ejector pin 22 can accurately abut against the tail of the first ejector pin 14, and further enhances the sealing of the connection between valve seat 1 and cylinder 2.

[0046] A second connector 31 is provided at one end of the cylinder head 3 along the axial direction. The second connector 31 is threaded, and the cylinder head 3 and the cylinder 2 are detachably threadedly connected to the second mounting base 26 via the second connector 31. Rotating the cylinder head 3 can separate it from the cylinder body 2. Preferably, the thread on the second connector 31 is an external thread, and the thread on the second mounting base 26 is an internal thread. Preferably, the inner cavity of the second mounting base 26 of the cylinder 2 is provided with a retaining spring groove and an annular cavity, which can accommodate a retaining spring, a sealing gasket, and a sealing gasket pressure plate to enhance the connection sealing performance.

[0047] When the air passage needs to be inspected or the seals need to be replaced, the cylinder head 3 can be separated from the cylinder 2 body simply by rotating it. This split structure allows the cylinder head 3 to be repaired without disassembling the entire cylinder 2 component when the seal fails or the air passage is blocked, further reducing equipment downtime and maintenance costs.

[0048] refer to Figure 3 The cylinder head 3 has a second interface 33 connected to the air source at the other end along the axial direction. The cylinder head 3 has a cavity 32, which is connected to the piston cavity 27. The air source enters the cavity 32 through the second interface 33. The cylinder 2 and the cylinder head 3 are connected. When the glue supply pressure of the glue supply line is less than the pressure of the air source, the air source accurately introduces the gas into the piston cavity 27 through the cavity 32. The air pressure is accumulated in the piston cavity 27, and the air pressure pushes the upper part of the piston part 25. When the upper part of the piston part 25 slides downward, the piston part 25 pushes the tail of the second ejector pin 22. The head of the second ejector pin 22 abuts against the tail of the first ejector pin 14, thereby driving the first ejector pin 14 to slide in the receiving cavity 12. The head of the first ejector pin 14 abuts against the glue inlet 113 and blocks the glue inlet 113. At this time, the space between the glue inlet 113 and the return hole 131 is blocked. When the glue supply pressure in the glue supply line is greater than the pressure of the air source, the glue pushes the first ejector pin 14 to move upward, thereby opening the glue inlet 113 and connecting the glue inlet 113 and the return hole 131. The glue then flows through the return hole 131 to the return line to achieve return.

[0049] Since the cylinder head 3 is provided with a second interface 33 that can be connected to an air source, and the piston 25 is driven by the air source, the pressure of the return valve can be easily adjusted by adjusting the pressure of the air source, thereby easily adjusting the pressure of the glue supply line.

[0050] refer to Figure 2-3 To prevent the adhesive from leaking and contaminating the piston part 25, the piston part 25 specifically includes a piston head 251 and a piston ring 252. The piston part 25 and the inner wall of the cylinder 2 are fitted together to form a sliding guide. After the piston ring 252 is deformed under pressure, it is pressed tightly against the cavity wall to form a dynamic sealing interface.

[0051] refer to Figure 3The second interface 33 is connected to the connector 5, which is connected to an external air source. The air source flows through the air pipe and enters the cavity 32 of the cylinder head 3 from the second interface 33.

[0052] Preferably, the connector 5 can be specifically machined to fit the shape of the second interface 33, thereby facilitating the connection of the second interface 33 to the air source via an air pipe. The connection method is not particularly limited as long as the connector can be tightly connected to the second interface 33; for example, it can be connected by threads.

[0053] refer to Figure 4 In the second embodiment of this invention, a second mounting platform 24 is provided on the outside of the cylinder 2. The second mounting platform 24 is provided with a pressure relief hole 241. Specifically, when the pressure inside the cylinder 2 rises abnormally due to the reciprocating motion of the piston part 25 or the aging of the piston ring 252, the high-pressure gas is discharged outward through the pressure relief hole 241. During maintenance, by rotating the second mounting platform 24, the second mounting platform 24 drives the thread at the cylinder 2 to unscrew the valve body 1. When installation is required, by rotating the second mounting platform 24, the thread at the cylinder 2 can be screwed into the valve body 1, which is time-saving and quick.

[0054] The rest of this embodiment is the same as that in Embodiment 1. Features not explained in this embodiment are explained using the methods in Embodiment 1, and will not be repeated here.

[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A split-type pneumatic return valve, characterized in that: The device includes a valve seat and a cylinder. One axial end of the valve seat has a first interface and a glue inlet, while the other axial end has a first connector with threads. The valve seat contains a through-cavity housing with a first ejector pin inside. The end of the first ejector pin can seal the glue inlet, and the first ejector pin is slidably housed within the housing. One axial end of the cylinder has a first mounting seat, and the other axial end has a second mounting seat with threads. The cylinder contains a piston chamber, a piston portion, and a cylinder body. A second ejector pin is slidably mounted within the cylinder body, with one end fixedly connected to the piston portion. When the valve seat and cylinder are connected, the other end of the second ejector pin extends into the housing and abuts against the tail of the first ejector pin. The valve seat and cylinder are detachably connected to the first mounting seat via the first connector and a threaded connection.

2. The split-type pneumatic return valve according to claim 1, characterized in that: The first connector is provided with an external thread, and the first mounting base is provided with an internal thread.

3. A split-type pneumatic return valve according to claim 2, characterized in that: The inner cavity of the first mounting base is provided with a retaining spring groove and an annular cavity. The retaining spring groove is provided with a retaining spring sheet, and the annular cavity is provided with a sealing gasket and a sealing gasket pressure plate. The retaining spring sheet is engaged in the retaining spring groove, and the sealing gasket and the sealing gasket pressure plate are pressed against the annular cavity by the retaining spring sheet.

4. A split-type pneumatic return valve according to claim 1, characterized in that: The first ejector pin is provided with a first guide portion in the radial direction. The first guide portion is located at the tail of the first ejector pin. The first guide portion includes a first guide member and a fourth sealing ring. The first guide portion abuts against the inner wall of the accommodating cavity and slides axially with the first ejector pin.

5. A split-type pneumatic return valve according to claim 4, characterized in that: The first ejector pin is provided with a second guide member in the radial direction. The second guide member is located in the middle of the first ejector pin and abuts against the inner wall of the accommodating cavity, sliding axially with the first ejector pin.

6. A split-type pneumatic return valve according to claim 4, characterized in that: The head of the first pin is spherical or conical.

7. A split-type pneumatic return valve according to claim 1, characterized in that: The first interface section is provided with an adhesive inlet, an outer retaining ring, and a front retaining ring. The outer retaining ring forms an axial constraint with the first interface section, and the outer retaining ring clamps and fixes the front retaining ring. The first interface section is connected to the adhesive supply pipeline.

8. A split-type pneumatic return valve according to claim 1, characterized in that: A reflux hole is provided above the first interface of the valve seat, and the reflux hole is connected to the reflux pipeline.

9. A split-type pneumatic return valve according to claim 1, characterized in that: A second mounting platform is provided on the outer side of the cylinder housing, and a pressure relief hole is provided on the second mounting platform.

10. A split-type pneumatic return valve according to claim 1, characterized in that: The cylinder head includes a cylinder head, a second interface portion connected to an air source at one end along the axial direction, a second connector at the other end along the axial direction, the second connector having an internal thread, a cavity inside the cylinder head communicating with a piston cavity, an external thread at the second mounting seat of the cylinder, and the cylinder head and cylinder being detachably threadedly connected to the second mounting seat via the second connector.

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