Fixed-distance injection valve and spraying equipment

Abstract

The utility model is applicable to the technical field of spraying, and provides a fixed-distance injection valve and spraying equipment, and the fixed-distance injection valve comprises a valve main body, a firing pin, an elastic reset piece and a limiting structure. The spraying equipment comprises any one of the fixed-distance injection valves. The acting force is applied to the driving end, so that the working end of the firing pin moves in the direction close to the glue outlet channel to extrude the glue solution located near the glue outlet channel in the containing cavity, and the pressure of the glue solution at the inlet of the glue outlet channel is increased until enough momentum is obtained and sprayed out of the glue outlet channel. In addition, a limiting structure is arranged on the valve body, compared with an injection valve in the prior art, when the working end of the firing pin extrudes the glue solution in the containing cavity to conduct glue solution injection, the limiting structure can limit the firing pin, the working end of the firing pin is prevented from making contact with the inner wall of the containing cavity, and the service life of the firing pin is prolonged. Therefore, solid particles in the solid-liquid mixed glue solution are prevented from collapsing or deforming due to extrusion, and the stability of the property of the glue solution is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of spraying technology, and in particular relates to a fixed-distance spray valve and spraying equipment. Background Technology

[0002] A spray valve is a device used for spraying adhesives. Its function is to spray and coat low-viscosity adhesives such as paint, silicone, and UV adhesives. It is widely used in machinery manufacturing, semiconductors, PCB (Printed Circuit Board) manufacturing, and SMT (Surface Mount Technology) manufacturing, for example, in mobile phone case coating, flux spraying, and surface coating. However, some specific processes require spraying a solid-liquid mixture of adhesives onto the product. Existing spray valves often suffer from problems where the properties of the solid-liquid mixture change during the spraying process. Utility Model Content

[0003] The purpose of this invention is to provide a fixed-distance spray valve and spraying equipment, which aims to solve the technical problem that existing spray valves can cause changes in the properties of solid-liquid mixed adhesives.

[0004] This utility model is implemented as follows: Firstly, a fixed-distance injection valve includes:

[0005] The valve body has a receiving cavity and an adhesive outlet channel. The receiving cavity is used to receive adhesive liquid and is connected to the adhesive supply device. The adhesive outlet channel is used to connect the receiving cavity to the outside.

[0006] A striking pin is movably disposed on the valve body. The striking pin has a driving end and a working end. The working end is located inside the receiving cavity, and the driving end is located outside the valve body. The driving end is used to move under the action of external force to drive the working end to move towards the glue outlet channel.

[0007] An elastic reset member, disposed between the striking pin and the valve body, is used to apply a force to the striking pin, causing the working end of the striking pin to move away from the dispensing channel; and

[0008] A limiting structure is provided on the valve body. The limiting structure is used to limit the impact pin to prevent the working end of the impact pin from contacting the inner wall of the receiving cavity when the adhesive is sprayed.

[0009] In one optional embodiment, the limiting structure is disposed outside the valve body, and an abutment structure is provided on the portion of the striker located outside the valve body. The abutment structure is used to abut against the limiting structure to limit the striker.

[0010] In an optional embodiment, the limiting structure includes a limiting part disposed on the valve body, and the abutting structure includes an abutting part disposed on the striker. The limiting part has a limiting surface on the side facing the abutting part, and the abutting part is provided with an abutting surface, which is used to abut against the limiting surface to limit the striker.

[0011] In an optional embodiment, the elastic reset member includes a reset spring fitted around the outside of the abutting portion and the outside of the limiting portion. The abutting portion is provided with a first reset surface, and the valve body is provided with a second reset surface opposite to the first reset surface. One end of the reset spring abuts against the first reset surface, and the other end abuts against the second reset surface.

[0012] In an optional embodiment, a guide structure is provided at the entrance of the dispensing channel. The guide structure is located on the inner wall of the receiving cavity. The guide structure is used to guide the adhesive when it is squeezed, so that the adhesive flows to the dispensing channel.

[0013] In one alternative embodiment, the guide structure includes a guide groove, and the cross-sectional area of ​​the guide groove gradually decreases along the depth direction of the guide groove.

[0014] In one optional embodiment, the valve body includes a centering sleeve and a receiving assembly. The receiving assembly has a fluid groove. The centering sleeve is installed at the opening of the fluid groove. The centering sleeve and the inner wall of the fluid groove form the receiving cavity. The firing pin passes through the centering sleeve and is slidably connected to the centering sleeve. The limiting structure is located on the centering sleeve. The dispensing channel is located on the receiving assembly and communicates with the fluid groove.

[0015] In an optional embodiment, the receiving assembly includes a receiving body and a nozzle portion. The receiving body is provided with a nozzle mounting groove communicating with the fluid groove. The nozzle portion is disposed in the nozzle mounting groove, and the dispensing channel is located on the nozzle portion.

[0016] In one alternative embodiment, the receiving component is provided with a mounting groove, the fluid groove is located on the bottom surface of the mounting groove, the end of the centering sleeve is inserted into the mounting groove, and the end of the centering sleeve is sealed to the bottom surface of the mounting groove.

[0017] In a second aspect, a spraying device is provided, comprising the fixed-distance spray valve described in any of the preceding claims.

[0018] The first aspect of this invention, compared to the prior art, provides the following technical advantages: A receiving cavity is provided in the valve body for containing adhesive and communicating with the adhesive supply device, and the receiving cavity is connected to the outside via an adhesive outlet channel. A striking pin is also movably mounted on the valve body, with its working end located inside the receiving cavity and its driving end located outside the valve body. By applying force to the driving end, the working end of the striking pin is moved towards the adhesive outlet channel, thereby squeezing the adhesive in the receiving cavity near the outlet channel, increasing the adhesive pressure at the inlet of the outlet channel until sufficient momentum is obtained for ejection from the outlet channel. Simultaneously, an elastic reset member is provided between the striking pin and the valve body, which can apply force to the striking pin after spraying, causing the working end of the striking pin to move away from the outlet channel, allowing the striking pin to return to its original position. In addition, a limiting structure is provided on the valve body. Compared with the spray valve in the prior art, when the working end of the firing pin squeezes the adhesive in the receiving cavity to spray the adhesive, the limiting structure can limit the firing pin, prevent the working end of the firing pin from contacting the inner wall of the receiving cavity, and prevent the solid particles in the solid-liquid mixed adhesive from being squeezed and collapsing or deforming, thus ensuring the stability of the adhesive's own properties and improving the stability of the spraying effect.

[0019] It is understandable that the beneficial effects of the second aspect mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model 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.

[0021] Figure 1 This is a schematic diagram of the structure of a fixed-distance injection valve provided in one embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of a fixed-distance injection valve provided in another embodiment of the present invention;

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Valve body; 11. Centering sleeve; 12. Receiving assembly; 121. Receiving body; 122. Nozzle part; 123. Mounting groove; 13. Receiving cavity; 14. Dispensing channel; 15. Second reset surface; 2. Strike pin; 21. Drive end; 22. Working end; 23. Abutting structure; 231. Abutting part; 232. Abutting surface; 233. First reset surface; 3. Elastic reset element; 31. Reset spring; 4. Limiting structure; 41. Limiting part; 42. Limiting surface; 5. Guide structure; 51. Guide groove; 6. Dispensing channel. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments 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 this utility model, and should not be construed as limiting this utility model.

[0026] In the description 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 accompanying drawings. They are only for the convenience of describing 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.

[0027] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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 utility model according to the specific circumstances.

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0030] Please refer to Figure 1 and Figure 2 As shown in the embodiment of this utility model, in a first aspect, a fixed-distance injection valve is provided. The fixed-distance injection valve includes a valve body 1, a striker 2, an elastic reset member 3, and a limiting structure 4. The valve body 1 has a receiving cavity 13 and an adhesive outlet channel 14. The receiving cavity 13 is used to receive adhesive and communicate with an adhesive supply device, and the adhesive outlet channel 14 is used to communicate the receiving cavity 13 with the outside. The striker 2 is movably disposed on the valve body 1. The striker 2 has a driving end 21 and a working end 22. The working end 22 is located inside the receiving cavity 13, and the driving end 21 is located outside the valve body 1. The driving end 21 is used to move under the action of an external force to drive the working end 22 to move towards the adhesive outlet channel 14. The elastic reset member 3 is disposed between the striker 2 and the valve body 1. The elastic reset member 3 is used to apply a force to the striker 2 to move the working end 22 of the striker 2 away from the adhesive outlet channel 14. The limiting structure 4 is provided on the valve body 1. The limiting structure 4 is used to limit the impact needle 2 to prevent the working end 22 of the impact needle 2 from contacting the inner wall of the receiving cavity 13 when the adhesive is sprayed.

[0031] Specifically, valve body 1 refers to a supporting component with a certain volume; receiving cavity 13 refers to a cavity structure with a certain receiving space set inside valve body 1; and glue dispensing channel 14 refers to a channel structure set on valve body 1, the length of which can be adapted to the side wall thickness of receiving cavity 13 on valve body 1. Glue supply device refers to a device that can continuously output glue liquid; the glue supply device can be pneumatic or screw-type.

[0032] The striking pin 2 refers to a component of a certain length. The striking pin 2 can be rod-shaped or column-shaped, etc. The driving end 21 and the working end 22 refer to the two ends of the striking pin 2, respectively. When installing the striking pin 2, a mounting hole is provided on the valve body 1, and the striking pin 2 is slidably placed in the mounting hole, with the working end 22 extending into the receiving cavity 13.

[0033] The elastic reset element 3 refers to a component with a certain degree of elasticity, which can be a spring, elastic sheet, or rubber component, etc. The limiting structure 4 refers to a structure installed on the valve body 1. The limiting structure 4 can be located on the outside of the valve body 1 or inside the valve body 1. The limiting structure 4 can be a protruding structure, a stop structure, or a surface structure, etc., and can also be composed of a combination of various shapes.

[0034] The fixed-distance spray valve provided in this embodiment of the utility model has a receiving cavity 13 in the valve body 1 for containing adhesive and communicating with the adhesive supply device. The receiving cavity 13 is also connected to the outside through an adhesive outlet channel 14. A striker 2 is also movably mounted on the valve body 1. The working end 22 of the striker 2 is located inside the receiving cavity 13, and the driving end 21 is located outside the valve body 1. By applying a force to the driving end 21, the working end 22 of the striker 2 moves towards the adhesive outlet channel 14, thereby squeezing the adhesive in the receiving cavity 13 near the adhesive outlet channel 14. This increases the adhesive pressure at the entrance of the adhesive outlet channel 14 until sufficient momentum is obtained for it to be sprayed out from the adhesive outlet channel 14. Simultaneously, an elastic reset member 3 is provided between the striker 2 and the valve body 1. After spraying, a force can be applied to the striker 2 to move the working end 22 of the striker 2 away from the adhesive outlet channel 14, allowing the striker 2 to return to its original position. In addition, a limiting structure 4 is provided on the valve body 1. Compared with the spray valve in the prior art, when the working end 22 of the impact pin 2 squeezes the adhesive in the receiving cavity 13 to spray the adhesive, the limiting structure 4 can limit the impact pin 2, preventing the working end 22 of the impact pin 2 from contacting the inner wall of the receiving cavity 13. This prevents the solid particles in the solid-liquid mixed adhesive from being squeezed and collapsing or deforming, ensuring the stability of the adhesive's own properties, and thus improving the stability of the spraying effect.

[0035] In one embodiment, see Figure 1 and Figure 2 The limiting structure 4 is located outside the valve body 1. An abutment structure 23 is provided on the portion of the striking pin 2 located outside the valve body 1. The abutment structure 23 is used to abut against the limiting structure 4 to limit the striking pin 2. Specifically, "limiting structure 4 outside the valve body 1" means that the limiting structure 4 can be located on the surface or end of the valve body 1. By placing the limiting structure 4 outside the valve body 1 and providing the abutment structure 23 on the portion of the striking pin 2 located outside the valve body 1, the abutment structure 23 can abut against the limiting structure 4 when the striking pin 2 moves to the designated position, preventing the striking pin 2 from continuing to move towards the dispensing channel 14. This makes the setting of the limiting structure 4 more convenient and also makes the processing of the valve body 1 more convenient.

[0036] In one embodiment, see Figure 1 and Figure 2The limiting structure 4 includes a limiting part 41 disposed on the valve body 1, and the abutting structure 23 includes an abutting part 231 disposed on the striking pin 2. The limiting part 41 has a limiting surface 42 on the side facing the abutting part 231. The abutting part 231 is provided with the abutting surface 232, and the abutting surface 232 is used to abut against the limiting surface 42 to limit the striking pin 2. Specifically, the limiting part 41 refers to a part with a certain volume on the valve body 1, and the shape of the limiting part 41 can be columnar, block-shaped, or plate-shaped, etc. The limiting surface 42 is a surface structure with a certain area disposed on the limiting part 41. The limiting surface 42 can be a planar structure or an inclined structure. The abutting part 231 refers to a part with a certain volume on the striking pin 2, and the shape of the abutting part 231 can be columnar, block-shaped, or plate-shaped, etc. The contact surface 232 refers to a surface structure with a certain area provided on the contact surface 232. The contact surface 232 can be a planar structure or an inclined structure. Under the action of external force, the driving end 21 of the ejector pin 2 drives the working end 22 to move towards the glue dispensing channel 14 to spray glue. During this process, the ejector pin 2 is limited by the contact surface 232 on the contact part 231 and the limiting surface 42 on the limiting part 41 abutting against each other. This causes the working end 22 to stop moving when it is still a certain distance from the side wall of the receiving cavity 13, thereby avoiding contact and collision between the working end 22 of the ejector pin 2 and the side wall of the receiving cavity 13.

[0037] In one embodiment, see Figure 1 and Figure 2The elastic reset component 3 includes a reset spring 31 fitted around the abutment portion 231 and the limiting portion 41. The abutment portion 231 has a first reset surface 233, and the valve body 1 has a second reset surface 15 opposite to the first reset surface 233. One end of the reset spring 31 abuts against the first reset surface 233, and the other end abuts against the second reset surface 15. Specifically, the reset spring 31 refers to an elastic component of a certain length, and its shape is typically cylindrical. The first reset surface 233 refers to a surface structure with a certain area provided on the abutment portion 231. The first reset surface 233 can be a planar structure, a curved surface, or an inclined surface. The second reset surface 15 refers to a surface structure with a certain area provided on the valve body 1. The second reset surface 15 can be a planar structure, a curved surface, or an inclined surface. When installing the return spring 31, it can be fitted onto the outside of the abutment part 231 and the outside of the limiting part 41, which can make the installation of the return spring 31 more stable. At the same time, the first return surface 233 and the second return surface 15 are arranged opposite to each other. By abutting one end of the return spring 31 against the first return surface 233 and the other end against the second return surface 15, the return spring 31 applies a thrust away from the valve body 1 to the abutment part 231 on the striker 2, so that the striker 2 can quickly reset after the glue is sprayed.

[0038] In one embodiment, see Figure 1 and Figure 2 A guide structure 5 is provided at the inlet of the glue dispensing channel 14. The guide structure 5 is located on the inner wall of the receiving cavity 13. The guide structure 5 is used to guide the glue liquid when it is squeezed, so that the glue liquid flows to the glue dispensing channel 14. Specifically, the guide structure 5 refers to a structure with a guiding function provided on the inner wall of the receiving cavity 13. The guide structure 5 can be a groove structure, a protrusion structure, etc. With the setting of the guide structure 5, when the glue liquid near the inlet of the glue dispensing channel 14 is squeezed at the working end 22, the glue liquid can flow smoothly to the glue dispensing channel 14, thereby making the glue spraying more convenient.

[0039] In one embodiment, see Figure 1 and Figure 2 The guide structure 5 includes a guide groove 51, and the cross-sectional area of ​​the guide groove 51 gradually decreases along its depth direction. Specifically, the guide groove 51 refers to a groove structure with a certain depth, which is recessed into the side wall of the receiving cavity 13. The inlet of the glue dispensing channel 14 can be connected to the bottom surface of the guide groove 51. Furthermore, the cross-sectional area of ​​the guide groove 51 gradually decreases along its depth direction, thereby guiding the glue through the guide groove 51 and improving the flow guiding effect of the guide structure 5.

[0040] In one embodiment, see Figure 1 and Figure 2 The valve body 1 includes a centering sleeve 11 and a receiving assembly 12. The receiving assembly 12 has a fluid groove. The centering sleeve 11 is installed at the opening of the fluid groove. The centering sleeve 11 and the inner wall of the fluid groove form a receiving cavity 13. The striking pin 2 passes through the centering sleeve 11 and is slidably connected to the centering sleeve 11. The limiting structure 4 is located on the centering sleeve 11. The dispensing channel 14 is located on the receiving assembly 12 and communicates with the fluid groove. Specifically, the centering sleeve 11 refers to a component with a certain volume. The centering sleeve 11 can be columnar, block-shaped, or a combination of various shapes. The receiving assembly 12 refers to a component or component structure with a certain volume. The receiving assembly 12 can be columnar, block-shaped, or a combination of various shapes. The fluid groove refers to a groove structure with a certain receiving space. The fluid groove usually has an opening, which facilitates the processing of the fluid groove on the receiving assembly 12. The dispensing channel 14 can be set on the bottom surface or side wall of the fluid groove. An injection channel 6 for communicating with a dispensing device can be set on the bottom surface or side wall of the fluid groove. By installing the centering sleeve 11 at the opening of the fluid groove, the centering sleeve 11 and the inner wall of the fluid groove form a receiving cavity 13. The striking pin 2 passes through the centering sleeve 11 and is slidably connected to the centering sleeve 11, allowing the working end 22 of the striking pin 2 to extend into the interior of the receiving cavity 13. At the same time, the limiting structure 4 is located on the centering sleeve 11, and the glue dispensing channel 14 is located on the receiving assembly 12 and communicates with the fluid groove. By dividing the valve body 1 into two parts, the centering sleeve 11 and the receiving assembly 12, the structure of the entire valve body 1 is simpler and the processing and assembly are more convenient.

[0041] In one embodiment, see Figure 2 The receiving assembly 12 includes a receiving body 121 and a nozzle part 122. The receiving body 121 is provided with a nozzle mounting groove communicating with the fluid groove. The nozzle part 122 is disposed in the nozzle mounting groove, and the dispensing channel 14 is located on the nozzle part 122. Specifically, the nozzle part 122 refers to a component with a certain volume. The nozzle part 122 can be block-shaped, column-shaped, or a combination of various shapes. The nozzle mounting groove refers to a groove structure with a certain depth. By placing the dispensing channel 14 on the nozzle part 122 and communicating with the fluid groove, the dispensing channel 14 can be communicated with the receiving cavity 13 after the nozzle part 122 is installed on the nozzle mounting groove. Furthermore, nozzle parts 122 with dispensing channels 14 of different sizes can be replaced according to different process requirements.

[0042] In one embodiment, see Figure 1 and Figure 2The receiving component 12 is provided with a mounting groove 123, and a fluid groove is located on the bottom surface of the mounting groove 123. The end of the centering sleeve 11 is inserted into the mounting groove 123, and the end of the centering sleeve 11 is sealed to the bottom surface of the mounting groove 123. Specifically, the mounting groove 123 refers to a groove structure with a certain depth, and the fluid groove is located on the bottom surface of the mounting groove 123. The cross-sectional shape of the mounting groove 123 is adapted to the cross-sectional shape of the end of the centering sleeve 11, so that the end of the centering sleeve 11 can be inserted into the mounting groove 123, and the end of the centering sleeve 11 is sealed to the bottom surface of the mounting groove 123, thereby making the assembly of the centering sleeve 11 and the receiving component 12 more convenient.

[0043] In one specific embodiment, please refer to Figure 1 and Figure 2 The centering sleeve 11 is cylindrical in shape, with one end inserted into the mounting groove 123, and the end of the centering sleeve 11 is sealed to the bottom surface of the mounting groove 123. The centering sleeve 11 also has a mounting through hole along its axis, and the striking pin 2 is slidably disposed within the mounting through hole to allow the striking pin 2 to penetrate the centering sleeve 11, thus simplifying the structure of the entire valve body 1.

[0044] Secondly, a spraying apparatus is provided, comprising the fixed-distance spray valve described in any of the preceding claims. It is understood that the beneficial effects of the second aspect are described in the relevant descriptions of the first aspect above, and will not be repeated here.

[0045] The above are merely preferred embodiments of the present utility model, and only specifically describe the technical principles of the present utility model. These descriptions are only for explaining the principles of the present utility model and should not be construed as limiting the scope of protection of the present utility model in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model, as well as other specific embodiments of the present utility model that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of the present utility model.

Claims

1. A fixed-distance injection valve, characterized in that, include: The valve body has a receiving cavity and an adhesive outlet channel. The receiving cavity is used to receive adhesive liquid and is connected to the adhesive supply device. The adhesive outlet channel is used to connect the receiving cavity to the outside. A striking pin is movably disposed on the valve body. The striking pin has a driving end and a working end. The working end is located inside the receiving cavity, and the driving end is located outside the valve body. The driving end is used to move under the action of external force to drive the working end to move towards the glue outlet channel. An elastic reset element is disposed between the striker and the valve body to apply a force to the striker so that the working end of the striker moves away from the dispensing channel; as well as A limiting structure is provided on the valve body. The limiting structure is used to limit the impact pin to prevent the working end of the impact pin from contacting the inner wall of the receiving cavity when the adhesive is sprayed.

2. The fixed-distance injection valve as described in claim 1, characterized in that, The limiting structure is disposed on the outside of the valve body, and the part of the striking pin located outside the valve body is provided with an abutting structure. The abutting structure is used to abut against the limiting structure to limit the striking pin.

3. The fixed-distance injection valve as described in claim 2, characterized in that, The limiting structure includes a limiting part disposed on the valve body, and the abutting structure includes an abutting part disposed on the striker. The limiting part has a limiting surface on the side facing the abutting part, and the abutting part is provided with an abutting surface, which is used to abut against the limiting surface to limit the striker.

4. The fixed-distance injection valve as described in claim 3, characterized in that, The elastic reset component includes a reset spring fitted around the outside of the abutting part and the outside of the limiting part. The abutting part is provided with a first reset surface, and the valve body is provided with a second reset surface opposite to the first reset surface. One end of the reset spring abuts against the first reset surface, and the other end abuts against the second reset surface.

5. The fixed-distance injection valve as described in claim 1, characterized in that, A guide structure is provided at the entrance of the dispensing channel. The guide structure is located on the inner wall of the receiving cavity. The guide structure is used to guide the adhesive when it is squeezed, so that the adhesive flows to the dispensing channel.

6. The fixed-distance injection valve as described in claim 5, characterized in that, The guide structure includes a guide groove, and the cross-sectional area of ​​the guide groove gradually decreases along the depth direction of the guide groove.

7. The fixed-distance injection valve according to any one of claims 1 to 6, characterized in that, The valve body includes a centering sleeve and a receiving assembly. The receiving assembly has a fluid groove. The centering sleeve is installed at the opening of the fluid groove. The centering sleeve and the inner wall of the fluid groove form the receiving cavity. The firing pin passes through the centering sleeve and is slidably connected to the centering sleeve. The limiting structure is located on the centering sleeve. The dispensing channel is located on the receiving assembly and communicates with the fluid groove.

8. The fixed-distance injection valve as described in claim 7, characterized in that, The receiving assembly includes a receiving body and a nozzle part. The receiving body is provided with a nozzle mounting groove that communicates with the fluid groove. The nozzle part is disposed in the nozzle mounting groove, and the dispensing channel is located on the nozzle part.

9. The fixed-distance injection valve as described in claim 8, characterized in that, The receiving component is provided with an installation groove, the fluid groove is located on the bottom surface of the installation groove, the end of the centering sleeve is inserted into the installation groove, and the end of the centering sleeve is sealed to the bottom surface of the installation groove.

10. A spraying device, characterized in that, Includes the fixed-distance injection valve as described in any one of claims 1 to 9.

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