A glue outlet structure optimized back suction valve

Abstract

The application discloses a back suction valve with optimized glue outlet structure, which comprises a valve head, a needle locking bolt, a glue injection needle and a valve body. The valve head is installed at the bottom of a valve rod. The needle locking bolt is arranged at the lower middle part of the valve body. The glue injection needle is detachably installed at the bottom of the needle locking bolt. A needle adapter is internally provided with a fluid cavity for guiding glue liquid. The needle adapter is externally provided with a compensation assembly for changing the volume of the fluid cavity when the glue is opened and closed. Through the compensation assembly, the volume change of the fluid cavity when the valve is opened and closed is compensated through two states of the variable expansion direction diaphragm, that is, the compensation amount is changed through the shape change of the variable expansion direction diaphragm in the internal and external expansion states. Therefore, on the one hand, the possibility of generating air bubbles when the back suction valve is closed can be reduced, and the normal operation of the glue injection work is ensured. On the other hand, the problem of large glue injection head when the glue is opened can be effectively solved, and the width accuracy of the scribe line is ensured.

Description

Technical Field

[0001] This invention belongs to the field of back suction valve technology, and particularly relates to a back suction valve with optimized dispensing port structure. Background Technology

[0002] Back-suction valves, as a common fluid control device, are widely used in various fields, especially the dispensing industry. They are popular because their ability to draw back and stop the flow of adhesive when closed solves the problem of adhesive stringing. However, existing back-suction valves often have the following problems in actual use due to the characteristics of liquid flow and limitations of valve structure: First, air bubbles can enter the adhesive, easily affecting the normal dispensing process; second, a large amount of adhesive may appear at the moment the back-suction valve opens, potentially affecting the accuracy of the marking width.

[0003] The specific reasons for the above problems are as follows: Existing back-suction valves generally include a valve stem, glue inlet, needle adapter, needle locking nut, dispensing needle, valve head, valve body, and fluid chamber. During use, when the back-suction valve closes, the valve stem moves upward, causing the valve body to close. The direction of valve stem movement is opposite to the direction of fluid movement during dispensing. At this time, due to the negative pressure formed in the fluid chamber, the fluid at the dispensing needle outlet flows back, and some gas is drawn in and mixes with the glue. When the back-suction valve opens, the valve stem moves downward, causing a sudden increase in pressure in the fluid chamber, resulting in excessive glue being dispensed by the dispensing needle at the initial moment, causing a large dispensing head. Therefore, a back-suction valve with an optimized glue outlet structure is provided. Summary of the Invention

[0004] The purpose of this invention is to provide a back suction valve with an optimized dispensing port structure to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the specific technical solution of the present invention is as follows: A back suction valve with an optimized dispensing port structure includes a valve head, a needle locking bolt, a dispensing needle, and a valve body. The valve head is installed at the bottom of the valve stem, the needle locking bolt is located at the lower center of the valve body, and the dispensing needle is detachably installed at the bottom of the needle locking bolt. The valve body has an inlet for injecting adhesive at the valve stem position. It also includes a needle adapter for supporting and fixing the needle locking bolt. The needle adapter has a fluid cavity for guiding the adhesive flow inside. A compensation component is provided to change the volume of the fluid cavity during dispensing and dispensing. The compensation component includes a variable expansion direction diaphragm disposed on the inner wall of the needle adapter and a swing adjustment rod disposed outside the needle adapter at the position of the variable expansion direction diaphragm. One end of the swing adjustment rod is provided with an adjustment rod column for supporting the swing adjustment rod, and the other end of the swing adjustment rod is provided with a sliding hinge for swinging the swing adjustment rod. The adjustment rod column is connected to the needle adapter, the swing adjustment rod is rotatably disposed with the adjustment rod column, and the sliding hinge is slidably disposed with the swing adjustment rod.

[0006] Preferably, the needle adapter is located between the valve body and the needle locking bolt, one end of the needle adapter is connected to the valve body, and the other end of the needle adapter is connected to the needle locking bolt, and the fluid cavity is connected to the inner cavity of the dispensing needle.

[0007] Preferably, a sealing ring for sealing the joint is provided on the outside of the variable expansion direction diaphragm on the side of the fluid cavity, and a diaphragm pressure plate for pressing and fastening the variable expansion direction diaphragm is provided on the outside of the variable expansion direction diaphragm on the side of the swing adjustment rod. The diaphragm pressure plate is connected to the needle adapter, and an air guide cavity is opened inside the needle adapter at the position of the variable expansion direction diaphragm. The air guide cavity is connected to the fluid cavity.

[0008] Preferably, an adjusting rod locking screw for supporting and fixing the sliding hinge is provided inside the sliding hinge at a position away from the swing adjusting rod. The adjusting rod locking screw is rotatably disposed with the sliding hinge, and a nut for locking the adjusting rod locking screw is provided at the end of the adjusting rod locking screw.

[0009] Preferably, the bottom end of the needle adapter is provided with a T-slot at the nut position. The T-slot has a through-hole design. The nut is slidably disposed inside the T-slot. The end of the adjusting rod locking screw extends into the nut. The adjusting rod locking screw and the nut are engaged by threads.

[0010] The optimized dispensing port structure of the present invention provides a back suction valve with the following advantages:

[0011] This invention, through the setting of a compensation component, compensates for the volume change of the fluid cavity when the valve is opened and closed by the interaction of the adjusting rod column, swing adjusting rod, variable expansion direction diaphragm, sealing ring, needle adapter, diaphragm pressure plate, adjusting rod locking screw, sliding hinge, nut, T-slot, and air guide cavity. This is achieved through the two states of the variable expansion direction diaphragm. Specifically, the compensation amount is changed by the shape change of the variable expansion direction diaphragm in its internal and external expansion states. Therefore, on the one hand, it reduces the possibility of air bubbles when the back suction valve closes, ensuring the normal operation of the dispensing process; on the other hand, it effectively solves the problem of large dispensing ends during dispensing, ensuring the accuracy of the scribing width. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0014] Figure 2 This is an exploded planar sectional view of the present invention;

[0015] Figure 3 This is a schematic diagram of the needle adapter structure of the present invention;

[0016] Figure 4 This is a partial enlarged cross-sectional view of the needle adapter of the present invention;

[0017] Figure 5 This is a schematic diagram of the external expansion state structure of the variable expansion direction diaphragm of the present invention;

[0018] Figure 6 This is a schematic diagram of the expansion state structure inside the variable expansion direction diaphragm of the present invention.

[0019] The markings in the diagram are as follows: 10. Fluid chamber; 11. Glue inlet; 12. Valve head; 13. Needle locking bolt; 14. Dispensing needle; 15. Valve body; 201. Adjusting rod column; 202. Swing adjusting rod; 203. Variable expansion direction diaphragm; 204. Sealing ring; 205. Needle adapter; 206. Diaphragm pressure plate; 207. Adjusting rod locking screw; 208. Sliding hinge; 209. Nut; 210. T-slot; 211. Air guide chamber. Detailed Implementation

[0020] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the embodiments of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0021] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", 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 the present invention 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 the embodiments of the present invention.

[0022] 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 embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] 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, an electrical connection, or a communication 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.

[0024] The following disclosure provides many different implementations or examples for carrying out different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0025] To better understand the purpose, structure, and function of this invention, the following detailed description of a back suction valve with an optimized dispensing port structure, in conjunction with the accompanying drawings, is provided.

[0026] like Figure 1-6As shown, the present invention discloses a back-suction valve with optimized dispensing port structure, comprising a valve head 12, a needle locking bolt 13, a dispensing needle 14, and a valve body 15. The valve head 12 is installed at the bottom of the valve stem and is used for opening and closing the dispensing of adhesive. The needle locking bolt 13 is located at the lower center of the valve body 15 and is used for supporting and fixing the dispensing needle 14. The dispensing needle 14 is detachably installed at the bottom of the needle locking bolt 13 and is used for discharging adhesive. The valve body 15 has an inlet 11 for injecting adhesive at the valve stem position. As prior art, this invention will not be described in detail. The device also includes a needle adapter 205 for supporting and fixing the needle locking bolt 13. The needle adapter 205 is located between the valve body 15 and the needle locking bolt 13. One end of the needle adapter 205 is connected to the valve body 15, and the other end of the needle adapter 205 is connected to the needle locking bolt 13. The needle adapter 205 has a fluid cavity 10 for guiding the adhesive liquid inside. The fluid cavity 10 is connected to the inner cavity of the dispensing needle 14. The needle adapter 205 is provided with a compensation component for changing the volume of the fluid cavity 10 when dispensing and closing the adhesive.

[0027] Specifically, the compensation component includes a variable expansion direction diaphragm 203 disposed on the inner wall of the needle adapter 205, and a swing adjustment rod 202 disposed outside the needle adapter 205 at the position of the variable expansion direction diaphragm 203 for pressing the variable expansion direction diaphragm 203. A sealing ring 204 for sealing the connection is disposed on the outside of the variable expansion direction diaphragm 203 on the side of the fluid cavity 10, and a diaphragm pressure plate 206 for pressing and fastening the variable expansion direction diaphragm 203 is disposed on the outside of the variable expansion direction diaphragm 203 on the side of the swing adjustment rod 202. The diaphragm pressure plate 206 is connected to the needle adapter 205. An air guide cavity 211 is opened inside the needle adapter 205 at the position of the variable expansion direction diaphragm 203 for venting gas. The air guide cavity 211 is connected to the fluid cavity 10.

[0028] Furthermore, one end of the swing adjustment rod 202 is provided with an adjustment rod column 201 for supporting the swing adjustment rod 202, and the other end of the swing adjustment rod 202 is provided with a sliding hinge 208 for swinging the swing adjustment rod 202. The adjustment rod column 201 is connected to the needle adapter 205. The swing adjustment rod 202 and the adjustment rod column 201 are rotatably configured, and the sliding hinge 208 and the swing adjustment rod 202 are slidably configured. Inside the sliding hinge 208, away from the swing adjustment rod 202, there is an adjustment rod locking screw 20 for supporting and fixing the sliding hinge 208. 7. The adjusting rod locking screw 207 is rotatably connected to the sliding hinge 208. A nut 209 is provided at the end of the adjusting rod locking screw 207 to lock the adjusting rod locking screw 207. The bottom end of the needle adapter 205 is provided with a T-slot 210 at the position of the nut 209 to guide and limit the nut 209. The T-slot 210 has a through structure design. The nut 209 is slidably disposed inside the T-slot 210. The end of the adjusting rod locking screw 207 extends into the inside of the nut 209. The adjusting rod locking screw 207 and the nut 209 are engaged by threads.

[0029] Based on the above, the present invention, by setting up a compensation component, compensates for the volume change of the fluid cavity 10 when the valve is opened and closed by the mutual cooperation of the adjusting rod column 201, the swing adjusting rod 202, the variable expansion direction diaphragm 203, the sealing ring 204, the needle adapter 205, the diaphragm pressure plate 206, the adjusting rod locking screw 207, the sliding hinge 208, the nut 209, the T-slot 210, and the air guide cavity 211. This is achieved through the two states of the variable expansion direction diaphragm 203, which compensates for the volume change of the fluid cavity 10 when the valve is opened and closed. Specifically, the compensation amount is changed by the shape change of the variable expansion direction diaphragm 203 in its internal and external expansion states. Therefore, on the one hand, it can reduce the possibility of air bubbles when the back suction valve closes, ensuring the normal operation of the dispensing work; on the other hand, it can effectively solve the problem of large dispensing ends when the dispensing is opened, ensuring the accuracy of the scribing width.

[0030] The working principle of this invention: The variable expansion direction diaphragm 203 has two positions that can be switched (see attached figure). Figure 5 and appendix Figure 6The variable diaphragm 203 has two expansion states: external expansion and internal expansion. Once switched to either state, the diaphragm 203 can remain in the same state without deformation without external force. When the valve is open, the diaphragm 203 is in the external expansion state, and the swing adjustment rod 202 can control the deformation of the diaphragm 203 in the external expansion state by swinging around the adjustment rod column 201. When the valve is closed, the diaphragm 203 is in the internal expansion state, and this state and deformation remain constant. Therefore, the expansion position of the diaphragm 203 in the internal expansion state is fixed, and its volume within the fluid cavity 10 is also fixed. The expansion position of the diaphragm 203 in the external expansion state can be adjusted by swinging the adjustment rod column 201, thus allowing for adjustment of the volume occupied by the diaphragm 203 within the fluid cavity 10. Generally, in a continuous production process, the swing adjustment rod 202 is adjusted before production and locked by the adjustment rod locking screw 207. Before closing the valve, due to the pressure in the fluid chamber 10, the variable expansion direction diaphragm 203 is in an outward expansion state. When closing the valve, the valve head 12 rises, creating a negative pressure in the fluid chamber 10, causing the variable expansion direction diaphragm 203 to change to an inward expansion state. This reduces the volume inside the fluid chamber 10, preventing the dispensing valve from drawing in too much gas. As mentioned above, before opening the valve, the variable expansion direction diaphragm 203 is in an inward expansion state. When opening the valve, the valve head 12 descends, causing a sudden increase in pressure inside the fluid chamber 10, resulting in the variable expansion direction diaphragm 203 changing to an outward expansion state. This increases the volume inside the fluid chamber 10, preventing the phenomenon of large-head dispensing.

[0031] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A backflow valve with an optimized dispensing port structure, comprising a valve head (12), a needle locking bolt (13), a dispensing needle (14), and a valve body (15), wherein the valve head (12) is mounted on the bottom of the valve stem, the needle locking bolt (13) is disposed in the lower middle part of the valve body (15), the dispensing needle (14) is detachably mounted on the bottom of the needle locking bolt (13), and the valve body (15) has an inlet (11) for injecting adhesive at the valve stem position, characterized in that: Also includes: A needle adapter (205) is used to support and fix the needle locking bolt (13). The needle adapter (205) has a fluid cavity (10) for guiding the adhesive inside. The needle adapter (205) is provided with a compensation component for changing the volume of the fluid cavity (10) when opening and closing the adhesive. The compensation component includes a variable expansion direction diaphragm (203) provided on the inner wall of the needle adapter (205) and a swing arm provided on the outside of the needle adapter (205) at the position of the variable expansion direction diaphragm (203). The swing adjustment rod (202) has an adjustment rod column (201) at one end for supporting the swing adjustment rod (202), and a sliding hinge (208) at the other end for swinging the swing adjustment rod (202). The adjustment rod column (201) is connected to the needle adapter (205). The swing adjustment rod (202) and the adjustment rod column (201) are rotatably arranged, and the sliding hinge (208) and the swing adjustment rod (202) are slidably arranged.

2. The back suction valve with optimized dispensing port structure according to claim 1, characterized in that: The needle adapter (205) is located between the valve body (15) and the needle locking bolt (13). One end of the needle adapter (205) is connected to the valve body (15), and the other end of the needle adapter (205) is connected to the needle locking bolt (13). The fluid cavity (10) is connected to the inner cavity of the dispensing needle (14).

3. The back suction valve with optimized dispensing port structure according to claim 1, characterized in that: A sealing ring (204) for sealing the joint is provided on the outside of the variable expansion direction diaphragm (203) on the side of the fluid cavity (10), and a diaphragm pressure plate (206) for pressing and fastening the variable expansion direction diaphragm (203) is provided on the outside of the variable expansion direction diaphragm (203) on the side of the swing adjustment rod (202). The diaphragm pressure plate (206) is connected to the needle adapter (205), and an air guide cavity (211) is opened inside the needle adapter (205) at the position of the variable expansion direction diaphragm (203). The air guide cavity (211) is connected to the fluid cavity (10).

4. The back suction valve with optimized dispensing port structure according to claim 1, characterized in that: An adjusting rod locking screw (207) for supporting and fixing the sliding hinge (208) is provided inside the sliding hinge (208) away from the swing adjusting rod (202). The adjusting rod locking screw (207) is rotatably disposed with the sliding hinge (208). A nut (209) for locking the adjusting rod locking screw (207) is provided at the end of the adjusting rod locking screw (207).

5. The back suction valve with optimized dispensing port structure according to claim 4, characterized in that: The bottom end of the needle adapter (205) is provided with a T-slot (210) at the position of the nut (209). The T-slot (210) is designed to be open at both ends. The nut (209) is slidably disposed inside the T-slot (210). The end of the adjusting rod locking screw (207) extends into the nut (209). The adjusting rod locking screw (207) and the nut (209) are engaged by threads.

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