Pneumatic valve needle assembly of automatic glue gun

Abstract

The utility model belongs to the technical field of glue guns, and particularly relates to a pneumatic valve needle component of an automatic glue gun, which comprises a cylinder body and a valve needle, a valve cavity is arranged on one end face of the cylinder body, a cylinder cover is further arranged, a first mounting hole and a vent hole are arranged at the bottom of the valve cavity, a piston is arranged in the valve cavity, a connecting block is arranged on one end face of the piston, a threaded hole is arranged on the side face of the connecting block, and a second mounting hole is arranged on the piston. The connecting block is provided with a third installation hole, the threaded hole is communicated with the third installation hole, the valve needle penetrates through the first installation hole and the second installation hole and then is arranged in the second installation hole, a positioning bolt is arranged in the threaded hole and abuts against the side wall of the valve needle in a pressing mode, and a reset spring is arranged between the piston and the air cylinder cover. The end part of the valve needle is locked through a transverse positioning bolt, so that the valve needle is prevented from being positioned by the positioning bolt due to the rotation of the valve needle, the stability of a connecting structure of the piston and the valve needle is improved, the valve needle is ensured to accurately control the opening degree of a glue gun, and the gluing quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of glue gun technology, and in particular to an automatic glue gun pneumatic valve needle assembly. Background Technology

[0002] The glue gun is a crucial component in the glue application process, and the valve needle assembly is an even more critical part of it, directly controlling the glue dispensing and shutting off. Currently, the valve needle assemblies in automatic glue guns typically feature an external thread on the top of the valve needle, while the piston has a threaded hole that connects the valve needle and piston. However, this threaded connection can loosen over time, causing the valve needle to shift downwards. This directly affects the glue gun's opening, the amount of glue dispensed, and ultimately, the quality of the glue application. In some cases, the valve needle may even detach from the piston, rendering the glue gun unable to control the glue dispensing.

[0003] To address the aforementioned problems, this utility model document proposes an automatic glue gun pneumatic valve needle assembly. Utility Model Content

[0004] This invention provides an automatic glue gun pneumatic valve needle assembly, which improves the stability of the connection structure between the piston and the valve needle and ensures the control accuracy of the valve needle.

[0005] This utility model provides the following technical solution:

[0006] An automatic glue gun pneumatic valve needle assembly includes a cylinder body and a valve needle. One end face of the cylinder body has a valve chamber and a cylinder cover. The bottom of the valve chamber has a first mounting hole and a vent hole communicating with the other end face. A piston is slidably disposed within the valve chamber. A connecting block is provided on the end face of the piston adjacent to the cylinder cover. A threaded hole is provided on the side of the connecting block. A second mounting hole is provided on the piston along its height direction. A third mounting hole, corresponding to the second mounting hole, is provided on the end face of the connecting block adjacent to the piston. The threaded hole communicates with the third mounting hole. One end of the valve needle passes through the first and second mounting holes and is positioned within the second mounting hole. A positioning bolt is installed within the threaded hole and is pressed against the side wall of the valve needle. A return spring is provided between the piston and the cylinder cover.

[0007] Furthermore, the valve needle sidewall is provided with an annular limiting groove, and the end of the positioning bolt abuts against the limiting groove.

[0008] Furthermore, a guide block is provided on the adjacent surface of the piston and the bottom of the valve chamber, and a guide groove is provided on the bottom surface of the valve chamber corresponding to the guide block to cooperate with the guide block.

[0009] Furthermore, a bushing is provided inside the guide groove, and the guide block is slidably disposed inside the bushing.

[0010] Furthermore, the piston and the cylinder head have a lower positioning groove on their adjacent surfaces, and the cylinder head has an upper positioning groove at the corresponding position. The two ends of the return spring are respectively located in the lower positioning groove and the upper positioning groove.

[0011] Furthermore, the bottom surface of the valve cavity is also provided with a mounting positioning hole, which is a countersunk hole.

[0012] Furthermore, threaded holes are symmetrically provided on both sides of the connecting block.

[0013] Furthermore, a shaft plug seal ring is provided in the first mounting hole, and the valve needle passes through the shaft plug seal ring.

[0014] In this invention, the vent hole supplies gas to the valve chamber to increase the air pressure below the piston, pushing the piston upward and locking the end of the valve needle with a transverse positioning bolt. This prevents the valve needle from rotating and causing the positioning bolt to position the valve needle, improving the stability of the connection structure between the piston and the valve needle, ensuring that the valve needle can accurately control the opening of the glue gun, and thus improving the glue coating quality. Attached Figure Description

[0015] Figure 1 A three-dimensional structural schematic diagram of an automatic glue gun pneumatic valve needle assembly provided for an embodiment of this utility model;

[0016] Figure 2 A cross-sectional view of an automatic glue gun pneumatic valve needle assembly provided in an embodiment of this utility model;

[0017] Figure 3 A three-dimensional structural diagram of an automatic glue gun pneumatic valve needle assembly after removing the cylinder head, provided for an embodiment of this utility model;

[0018] Figure 4 This is a three-dimensional structural diagram of an automatic glue gun pneumatic valve needle assembly after removing the cylinder head, provided in an embodiment of the present utility model.

[0019] Figure 5 An exploded view of an automatic glue gun pneumatic valve needle assembly provided for an embodiment of this utility model;

[0020] Figure 6 This is a cross-sectional view of the cylinder body and cylinder head in an automatic glue gun pneumatic valve needle assembly provided in an embodiment of the present invention.

[0021] Figure label:

[0022] 1. Cylinder body; 101. Valve chamber; 102. First mounting hole; 103. Vent hole; 104. Guide groove; 105. Bushing; 106. Shaft plug seal ring; 107. Mounting positioning hole; 2. Cylinder head; 201. Upper positioning groove; 3. Valve needle; 301. Limiting groove; 4. Piston; 401. Second mounting hole; 402. Lower positioning groove; 403. Guide block; 5. Connecting block; 501. Third mounting hole; 502. Threaded hole; 503. Positioning bolt; 6. Return spring. Detailed Implementation

[0023] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0024] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "installation" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, "connection" can be a direct connection or an indirect connection through an intermediate medium. "Fixed" means that the relative positional relationship remains unchanged after the connection. The directional terms mentioned in the embodiments of this utility model, such as "inner," "outer," "top," and "bottom," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this utility model, and are not intended to 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 the embodiments of this utility model.

[0025] In this embodiment of the invention, 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. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0026] In this embodiment of the utility model, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0027] References to "one embodiment" or "some embodiments" as used in this specification mean that one or more embodiments of the present invention include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0028] Example:

[0029] Reference Figures 1 to 6 As shown, an automatic glue gun pneumatic valve needle assembly includes a cylinder body 1 and a valve needle 3. A valve chamber 101 is opened on one end face of the cylinder body 1, and a cylinder head 2 is also provided on this end face. A first mounting hole 102 and a vent hole 103 communicating with the other end face are opened at the bottom of the valve chamber 101. A piston 4 is slidably arranged in the valve chamber 101. A connecting block 5 is provided on the end face of the piston 4 adjacent to the cylinder head 2. A threaded hole 502 is opened on the side of the connecting block 5. A second mounting hole 401 is provided on the piston 4 along the height direction. A third mounting hole 501 corresponding to the second mounting hole 401 is provided on the end face of the connecting block 5 adjacent to the piston 4. The threaded hole 502 is connected to the third mounting hole 501. One end of the valve needle 3 passes through the first mounting hole 102 and the second mounting hole 401 and is located in the second mounting hole 401. A positioning bolt 503 is set in the threaded hole 502. The positioning bolt 503 is pressed against the side wall of the valve needle 3. A return spring 6 is provided between the piston 4 and the cylinder head 2.

[0030] The vent 103 supplies high-pressure gas to the area below the piston 4 inside the valve chamber 101. The gas pressure pushes the piston 4 upward, thereby controlling the movement of the valve needle 3. After passing through the first mounting hole 102 and the second mounting hole 401, the valve needle 3 is locked in the third mounting hole 501. Then, it is locked against the side wall of the valve needle 3 by the positioning bolt 503 in the threaded hole 502 on the side wall of the third mounting hole 501, thereby positioning the valve needle 3. Even if the valve needle 3 rotates, it will not affect the locking and positioning structure of the positioning bolt, effectively improving the stability of the connection structure between the valve needle 3 and the piston 4, and improving the control accuracy of the valve needle 3 on the opening of the glue gun.

[0031] The return spring 6 provides elastic force to the piston 4. When the glue gun needs to be closed, the high-pressure gas supply is stopped, and the piston 4 can move downward under the elastic force of the return spring 6, thereby driving the valve needle 3 to move downward, so that the valve needle 3 closes the glue gun.

[0032] The valve needle 3 has an annular limiting groove 301 on its side wall, and the end of the positioning bolt 503 abuts against the limiting groove 301.

[0033] The limiting groove 301 on the side wall of the valve needle 3 further improves the stability of the connection structure between the valve needle 3 and the piston 4. Even if the positioning bolt 503 becomes loose, the end of the positioning bolt 503 is still in the limiting groove 301, and the connection structure between the piston 4 and the valve needle 3 remains stable.

[0034] A guide block 403 is provided on the adjacent surface of the piston 4 and the bottom of the valve chamber 101, and a guide groove 104 is provided on the bottom surface of the valve chamber 101 at the position corresponding to the guide block 403 to cooperate with the guide block 403.

[0035] By sliding the guide block 403 within the guide groove 104, the stability of the piston 4's movement direction during vertical movement is improved, preventing deflection and thus ensuring the stability of the valve needle 3's movement direction. This ensures that the valve needle 3 can accurately open or close the glue gun.

[0036] A bushing 105 is provided inside the guide groove 104, and the guide block 403 is slidably disposed inside the bushing 105.

[0037] The bushing 105 reduces the friction between the guide block 403 and the guide groove 104, reduces the wear of the guide block 403 during movement, avoids the gap between the guide block 403 and the guide groove 104 from increasing, improves the service life of the guide block 403, and also improves the stability of the movement of the guide block 403.

[0038] The piston 4 and the cylinder head 2 are provided with a lower positioning groove 402 on their adjacent surfaces, and the cylinder head 2 is provided with an upper positioning groove 201 at the corresponding position. The two ends of the return spring 6 are respectively located in the lower positioning groove 402 and the upper positioning groove 201.

[0039] The upper positioning groove 201 and the lower positioning groove 402 are used to position the two ends of the return spring 6, thereby improving the stability of the position of the two ends of the return spring 6 and preventing the position of the return spring 6 from changing when the piston 4 moves and squeezes it. This ensures that the return spring 6 can exert a spring force on the piston 4, and when the gas supply stops, it can push the piston 4 back to the initial position, ensuring that the valve needle 3 can close the glue gun.

[0040] The bottom surface of the valve cavity 101 is also provided with a mounting positioning hole 107, which is a countersunk hole.

[0041] The mounting positioning hole 107 facilitates the assembly of the cylinder body 1 with other components of the glue gun. The mounting positioning hole 107 is set as a countersunk hole to prevent the bolts from affecting the movement of the piston 4 and to prevent the bolts from damaging the end face of the piston 4, thus affecting the service life of the piston 4.

[0042] The connecting block 5 has threaded holes 502 symmetrically arranged on both sides.

[0043] By setting two threaded holes 502, the stability of fixing the valve needle 3 is improved. The valve needle 3 is locked and fixed by the positioning bolts 503 in the two threaded holes 502. On the one hand, the stability of the connection between the valve needle 3 and the piston 4 is further improved, and on the other hand, the uniformity of the force on the valve needle 3 is improved, ensuring the stability of the movement direction of the valve needle 3.

[0044] The first mounting hole 102 is provided with a shaft plug seal 106, and the valve needle 3 passes through the shaft plug seal 106.

[0045] By setting a shaft plug seal ring 106 on the valve needle 3, the sealing performance of the valve needle 3 and the first mounting hole 102 is improved. On the one hand, it prevents gas from leaking from the connection, which would prevent the gas delivered by the vent hole 103 from pushing the piston 4 to move. On the other hand, it also prevents the glue in the glue gun from entering the valve chamber 101 and affecting the normal movement of the piston 4.

[0046] In use, the cylinder body 1 is installed on the stator assembly of the glue gun by using countersunk bolts to install positioning holes 107. The piston 4 is placed in the valve chamber 101. Then, the top end of the valve needle 3 passes through the first mounting hole 102 and the second mounting hole 401 and is locked in the third mounting hole 501. Then, the positioning bolt 503 is locked in the limiting groove 301 at the end of the valve needle 3, so that the valve needle 3 is connected to the piston 4. The return spring 6 is placed in the lower positioning groove 402 on the piston 4. Finally, the cylinder head 2 is installed on the cylinder body 1.

[0047] When using the glue gun, high-pressure gas is delivered from the vent 103 to the valve chamber 101 through the external air supply line, pushing the piston 4 upward and compressing the return spring 6. As the piston 4 moves, it also drives the valve needle 3 upward, opening the glue supply line of the glue gun for glue application. After the glue application is completed, it is necessary to close the glue supply line of the glue gun. This stops the delivery of high-pressure gas, and the piston 4 is no longer pushed by the gas. At the same time, under the elastic force of the return spring 6, the piston 4 moves downward to the initial position, simultaneously driving the valve needle 3 back to the initial position and closing the glue supply line of the glue gun.

[0048] The valve needle 3 is locked and fixed at the end by two positioning bolts 503. Rotation of the valve needle 3 will not affect the connection structure between the valve needle 3 and the piston 4, thus improving the stability of the connection between the valve needle 3 and the piston 4.

[0049] In practical use, the positioning bolt 503 is a set screw, which can prevent the positioning bolt 503 from loosening and further improve the stability of the connection between the valve needle 3 and the piston 4.

[0050] The piston 4 and the connecting block 5 are integrated into one image, which not only ensures the strength of the connection structure between the piston 4 and the connecting block 5, but also facilitates processing.

[0051] The piston 4 is provided with a guide ring and a sealing ring on its side wall. The sealing ring improves the sealing between the piston 4 and the inner wall of the valve chamber 101, ensuring the normal movement of the piston 4. The guide ring acts as a support and guide wire, preventing the piston 4 from directly contacting and rubbing against the inner wall of the valve chamber 101 during movement, thus protecting the piston 4 and the cylinder body 1 from damage.

[0052] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. In the absence of conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An automatic glue gun pneumatic valve needle assembly, characterized in that, The utility model discloses a valve needle and a cylinder body, the cylinder body is provided with a valve cavity in one end face, and the end face is also provided with a cylinder cover, the bottom of the valve cavity is provided with a first mounting hole and a vent hole, which are communicated with the other end face, a piston is slidably arranged in the valve cavity, the end face of the piston adjacent to the cylinder cover is provided with a connecting block, the side surface of the connecting block is provided with a threaded hole, the piston is provided with a second mounting hole in the height direction, the end face of the connecting block adjacent to the piston is provided with a third mounting hole corresponding to the second mounting hole, the threaded hole is communicated with the third mounting hole, one end of the valve needle is arranged in the second mounting hole after penetrating the first mounting hole and the second mounting hole, a positioning bolt is arranged in the threaded hole, the positioning bolt is pressed against the side wall of the valve needle, and a return spring is arranged between the piston and the cylinder cover.

2. An automatic glue gun pneumatic valve needle assembly according to claim 1, wherein, The side wall of the valve needle is provided with an annular limiting groove, and the end of the positioning bolt is pressed against the limiting groove.

3. An automatic glue gun pneumatic valve needle assembly according to claim 1, wherein, The adjacent surface of the piston and the bottom of the valve cavity is provided with a guide block, and the bottom surface of the valve cavity is provided with a guide groove corresponding to the position of the guide block and matched with the guide block.

4. An automatic glue gun pneumatic valve needle assembly according to claim 3, wherein, A bushing is arranged in the guide groove, and the guide block is slidably arranged in the bushing.

5. An automatic glue gun pneumatic valve needle assembly according to claim 1, wherein, The adjacent surface of the piston and the cylinder cover is provided with a lower limiting groove, the corresponding position of the cylinder cover is provided with an upper limiting groove, and the two ends of the return spring are arranged in the lower limiting groove and the upper limiting groove respectively.

6. An automatic glue gun pneumatic valve needle assembly according to claim 1, wherein, The bottom surface of the valve cavity is also provided with a mounting positioning hole, and the mounting positioning hole is a counterbore.

7. An automatic glue gun pneumatic valve needle assembly according to claim 1, wherein, The two side surfaces of the connecting block are symmetrically provided with threaded holes.

8. An automatic glue gun pneumatic valve needle assembly according to claim 1, wherein, An axle packing seal ring is arranged in the first mounting hole, and the valve needle penetrates the axle packing seal ring.

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