Solder paste piezoelectric injection valve and application process thereof

Abstract

The invention relates to the technical field of piezoelectric valves, in particular to a solder paste piezoelectric injection valve which comprises a valve body, a movable block is arranged in the valve body and slidably connected with the valve body, a piezoelectric actuator is further arranged on the valve body and can drive the movable block to slide up and down, and a discharging head is arranged on the lower side of the movable block in the valve body. The discharging head is fixedly connected with the valve body, and a discharging hole is formed in the lower side of the discharging head; a striker is arranged on the discharging head, the striker is in sliding connection with the valve body, the movable block can push the striker when sliding, a reset elastic piece corresponding to the striker is arranged on the discharging head, the reset elastic piece is fixedly connected with the discharging head, the reset elastic piece has the trend of pushing the striker to move towards the sliding block, and the striker is used for pushing solder paste to move towards the discharging hole; a feeding runner is further arranged in the valve body, a colloid runner is arranged on the firing pin corresponding to the feeding runner, the colloid runner is used for discharging solder paste towards the discharging hole, and a screw is arranged in the feeding runner. Solder paste can be stirred and mixed, and the mixing degree of the solder paste is improved.

Description

Technical Field

[0001] The invention relates to the technical field of piezoelectric valves, in particular to a solder paste piezoelectric injection valve and an application process thereof. Background Art

[0002] The electrojet valve is a valve that uses the dynamic deformation of piezoelectric materials to control fluids. It is usually composed of piezoelectric ceramics and metal films. When an electric field is applied, the piezoelectric ceramics will be compressed or stretched, which in turn drives the metal film to bend or twist, ultimately achieving fluid on / off control.

[0003] There are obvious differences between piezoelectric injection valves and non-contact piezoelectric valves in terms of working principles, usage scenarios and application fields. Among them, piezoelectric injection valves are suitable for microfluidics and experimental fields, and have the characteristics of high precision and fast response speed; non-contact piezoelectric valves are suitable for medical, cosmetics and other industries, and have the characteristics of high stability and easy maintenance. Under the existing technology, solder paste is usually applied using this type of piezoelectric valve, but solder paste is a solid-liquid mixture, and solder paste precipitation is prone to occur during the dispensing process, resulting in solid-liquid separation, which will affect product quality. Summary of the invention

[0004] In order to solve the problem that solder paste in the prior art is usually applied using this type of piezoelectric valve, but solder paste is a solid-liquid mixture, and solder paste precipitation is likely to occur during the dispensing process, resulting in solid-liquid separation, which will affect the product quality. The present application provides a solder paste piezoelectric injection valve, and the specific solution is as follows.

[0005] A solder paste piezoelectric injection valve comprises a valve body, a movable block is arranged in the valve body, the movable block is slidably connected to the valve body, a piezoelectric brake is also arranged on the valve body, the piezoelectric driver can drive the movable block to slide up and down, a discharge head is arranged in the valve body at the lower side of the movable block, the discharge head is fixedly connected to the valve body, and a discharge hole is opened at the lower side of the discharge head; The discharge head is provided with a striker, the striker is slidably connected to the valve body, the movable block can push the striker when sliding, a reset spring is provided on the discharge head corresponding to the striker, the reset spring is fixedly connected to the discharge head, the reset spring is fixedly connected to the striker, the reset spring has a tendency to push the striker to move toward the sliding block, and the striker is used to push the solder paste to move toward the discharge hole; A feed channel is also provided in the valve body, a colloid channel is provided on the striker corresponding to the feed channel, one end of the colloid channel is used to communicate with the feed channel, and the other end of the colloid channel is used to pass the solder paste toward the discharge hole, and a screw is provided in the feed channel, which is rotatably connected to the valve body and is used to stir the solder paste.

[0006] By adopting the above technical scheme, the sliding connection between the movable block and the valve body and the driving mode of the piezoelectric brake ensure that the movable block can move up and down quickly and accurately, thereby driving the striker to move and realize efficient spraying of the solder paste. The design of the reset spring enables the striker to reset quickly after each push, ensuring the stability of continuous spraying. The setting of the colloid flow channel enables the solder paste to smoothly enter the discharge hole under the push of the striker, avoiding the occurrence of blockage. The screw arranged in the feed flow channel not only contributes to the uniform delivery of the solder paste, but also prevents the solder paste from solidifying or agglomerating, thereby improving the reliability and consistency of the spraying.

[0007] Optionally, a driving motor is also provided on the valve body, and the rotating shaft of the driving motor is fixedly connected to the screw, and the driving motor is fixedly connected to the valve body. A sealing cover is also provided in the valve body corresponding to the screw, and the sealing cover is fixedly connected to the valve body. The driving motor is fixedly installed on the sealing cover, and a yield opening is opened in the sealing cover corresponding to the rotating shaft. A sealing sleeve is also provided on the valve body corresponding to the screw, and the sealing sleeve is fixedly connected to the valve body, and the screw is rotatably connected to the sealing sleeve.

[0008] By adopting the above technical solution, the setting of the drive motor realizes the automatic rotation of the screw, thereby effectively stirring and conveying the solder paste, ensuring the uniformity and fluidity of the solder paste; at the same time, the design of the sealing cover and the sealing sleeve effectively prevents the leakage of the solder paste, and improves the reliability and stability of the equipment.

[0009] Optionally, the screw is arranged along the length direction of the feed channel, and a feed pipe is also arranged on the valve body, one end of the feed pipe is used to pass the solder paste, and the other end of the feed pipe is used to pass the solder paste toward the feed channel.

[0010] By adopting the above technical solution, the screw is arranged along the length direction of the feed channel, which ensures the uniform stirring and conveying of the solder paste in the feed channel, improves the fluidity of the solder paste, and reduces the risk of blockage. At the same time, the design of the feed tube enables the solder paste to smoothly enter the feed channel, further ensuring the stable supply of solder paste and improving work efficiency and reliability.

[0011] Optionally, a sealing ring is further provided in the feed channel, the sealing ring is fixedly installed in the feed channel, the screw is rotatably connected to the sealing ring, a sealing ring is provided in the sealing ring corresponding to the screw, and the sealing ring abuts against the screw.

[0012] By adopting the above technical solution, the provision of sealing rings and sealing rings can effectively prevent solder paste leakage, improve the sealing during solder paste transportation, ensure the stable flow of solder paste in the feed channel, and at the same time reduce the entry of external impurities to ensure long-term reliable operation.

[0013] Optionally, the sealing ring is arranged at a position corresponding to the feed pipe, and a feed port is opened on the sealing ring, one end of the feed port is connected to the inside of the feed pipe, and the other end of the feed port is connected to the feed channel.

[0014] By adopting the above technical scheme, the position of the feed pipe is set inside the sealing ring, and a feed port is opened on the sealing ring. One end of the feed port is connected to the inside of the feed pipe, and the other end of the feed port is connected to the feed channel, which effectively prevents the leakage of solder paste during the feeding process, ensures the stable delivery of solder paste, and improves the reliability and working efficiency of the equipment.

[0015] Optionally, a discharge space is left between the striker and the discharge hole, one end of the discharge space is connected to the discharge hole, and the other end of the discharge space is connected to the colloid flow channel, and the solder paste in the discharge space cannot drip out of the discharge hole due to air pressure.

[0016] By adopting the above technical solution, the discharge space design between the striker and the discharge hole ensures that the solder paste will not drip out of the discharge hole due to gravity when there is no external force, effectively preventing the waste and pollution of the solder paste. At the same time, this design ensures that the solder paste can smoothly enter the discharge hole from the colloid flow channel under the extrusion of the striker when needed, thereby improving the working stability and reliability of the injection valve.

[0017] Optionally, the piezoelectric brake is provided with an electric field generator and a piezoelectric ceramic sheet, the electric field generator is used to form an electric field, and the piezoelectric ceramic sheet is deformed after inducing the electric field to abut against and push the movable block.

[0018] By adopting the above technical solution, the combined use of the electric field generator and the piezoelectric ceramic sheet can quickly generate deformation after receiving the electrical signal, thereby accurately controlling the up and down sliding of the movable block, achieving precise pushing of the striker, and improving the spraying accuracy and stability of the solder paste.

[0019] Optionally, the valve body is also provided with a mounting frame and a sliding rod, the mounting frame is fixedly connected to the piezoelectric brake, the piezoelectric brake can push the sliding rod, and the sliding rod is slidably connected to the mounting frame, the sliding rod is fixedly connected with an auxiliary feed rod on the side of the sliding rod facing the feed pipe, the auxiliary feed rod extends into the feed pipe and is slidably connected to the feed pipe, and a hose is provided on the side wall of the feed pipe, the hose is connected to the feed pipe and is used to pass solder paste, and the auxiliary feed rod can block the connection between the hose and the feed pipe when extended.

[0020] By adopting the above technical solution, since the solder paste is a solid-liquid mixture, the solder paste may be blocked in the feed tube. At this time, it is necessary to drive the sliding rod through the piezoelectric brake. The sliding rod can drive the auxiliary feed rod to move up and down to push the solder paste in the feed tube, thereby reducing the blockage of the solder paste. At the same time, the piezoelectric brake drives the movable block with the same frequency as the sliding rod, and can add a certain amount of solder paste while squeezing out the solder paste once, thereby reducing the situation where too much solder paste is filled and affects the flow.

[0021] Optionally, a spherical plug is provided at one end of the auxiliary feed rod extending into the feed pipe, and the spherical plug is used to seal the connection between the hose and the feed pipe.

[0022] By adopting the above technical solution and providing a spherical plug, the feeding hose can be further blocked when there is no need to pass solder paste, thereby further reducing the situation of solder paste passing.

[0023] The present application also provides an application process of a solder paste piezoelectric injection valve, including the above-mentioned solder paste piezoelectric injection valve, using the following steps: a. Pass the solder paste from the feed pipe into the feed channel; b. Start the screw to stir the solder paste; c. Pass the solder paste in the feed flow channel into the colloid flow channel; d. The sliding block is driven by a piezoelectric brake so that the sliding block moves repeatedly to squeeze out the solder paste.

[0024] By adopting the above technical solution, the solder paste can be stirred during spraying, which can not only reduce the blockage caused by uneven mixing of the solder paste, but also make the sprayed solder paste mix more evenly, thereby further improving product quality.

[0025] In summary, this application has at least the following beneficial effects: 1. The present application solves the problem that the solder paste in the prior art is usually applied using this type of piezoelectric valve, but the solder paste is a solid-liquid mixture, and during the dispensing process, the solder paste is prone to precipitation, resulting in solid-liquid separation, which will affect the product quality. The present application provides a screw with a stirring function to stir the solder paste before it is fed in, which can reduce blockage and improve the quality of the sprayed solder paste.

[0026] 2. The present application also provides an auxiliary feed rod that can assist in the introduction of solder paste, which can further reduce the situation where solder paste is blocked in the feed pipe and further improve the stability of processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional diagram of the first embodiment.

[0028] Figure 2It is a cross-sectional view of the first embodiment.

[0029] Figure 3 It is a cross-sectional view of the second embodiment.

[0030] Figure 4 It is a cross-sectional view of the third embodiment.

[0031] Description of reference numerals: 1. Valve body; 11. Movable block; 12. Piezoelectric brake; 13. Discharge hole; 14. Feed channel; 141. Screw; 142. Sealing sleeve; 143. Sealing ring; 144. Feed port; 15. Sealing cover; 151. Make way port; 16. Discharge space; 17. Mounting frame; 171. Sliding rod; 172. Return spring; 173. Auxiliary feed rod; 174. Spherical plug; 175. Stirring rod; 176. Stirring blade; 177. Arc-shaped protrusion; 2. Discharging head; 21. Strike pin; 211. Colloid flow channel; 22. Reset spring; 3. Drive motor; 4. Feed pipe; 41. Hose. DETAILED DESCRIPTION

[0032] The present application is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0033] Embodiment 1 Solder paste piezoelectric jet valve, such as Figure 1 and Figure 2 As shown, it includes a valve body 1, a movable block 11 is arranged inside the valve body 1, the movable block 11 is slidably connected to the valve body 1, a piezoelectric brake 12 is also arranged on the valve body 1, the piezoelectric driver can drive the movable block 11 to slide up and down, a discharge head 2 is arranged on the lower side of the movable block 11 inside the valve body 1, the discharge head 2 is fixedly connected to the valve body 1, and a discharge hole 13 is opened on the lower side of the discharge head 2. In specific implementation, an electric field generator and a piezoelectric ceramic sheet are arranged inside the piezoelectric brake 12, the electric field generator is used to form an electric field, and the piezoelectric ceramic sheet is deformed after the induction electric field to abut against and push the movable block 11, and the entire valve body 1 needs to be installed on a movable linear mechanism or other translation mechanism to spray solder paste to different positions.

[0034] like Figure 1 and Figure 2As shown, a striker 21 is provided on the discharge head 2, and the striker 21 is slidably connected to the valve body 1. The movable block 11 can push the striker 21 when sliding. A reset spring 22 is provided on the discharge head 2 corresponding to the striker 21. The reset spring 22 is fixedly connected to the discharge head 2, and the reset spring 22 is fixedly connected to the striker 21. The reset spring 22 has a tendency to push the striker 21 toward the sliding block. The striker 21 is used to push the solder paste toward the discharge hole 13. A discharge space 16 is left between the striker 21 and the discharge hole 13. One end of the discharge space 16 is connected to the discharge hole 13, and the other end of the discharge space 16 is connected to the colloid flow channel 211. The solder paste is in the discharge space 16 and cannot drip out of the discharge hole 13 due to air pressure. In specific implementation, the piezoelectric driver drives the striker 21 to move at a certain frequency, so that the solder paste can be sprayed out from the discharge hole 13 according to the frequency. When the striker 21 does not move, the solder paste cannot overcome the air pressure and drips out from the discharge hole 13.

[0035] like Figure 1 and Figure 2 As shown, a feed channel 14 is also provided in the valve body 1, and a colloid channel 211 is provided on the striker 21 corresponding to the feed channel 14, one end of the colloid channel 211 is used to communicate with the feed channel 14, and the other end of the colloid channel 211 is used to pass the solder paste toward the discharge hole 13, and a screw 141 is provided in the feed channel 14, and the screw 141 is rotatably connected to the valve body 1 and used to stir the solder paste. In specific implementation, the screw 141 can stir the solder paste in the feed channel 14 by rotating, so that the solder paste is mixed more evenly when entering the colloid channel 211.

[0036] like Figure 1 and Figure 2 As shown, the valve body 1 is also provided with a driving motor 3, the rotating shaft of the driving motor 3 is fixedly connected to the screw 141, the driving motor 3 is fixedly connected to the valve body 1, a sealing cover 15 is also provided in the valve body 1 corresponding to the screw 141, the sealing cover 15 is fixedly connected to the valve body 1, the driving motor 3 is fixedly installed on the sealing cover 15, the sealing cover 15 is provided with a clearance opening 151 corresponding to the rotating shaft, the valve body 1 is also provided with a sealing sleeve 142 corresponding to the screw 141, the sealing sleeve 142 is fixedly connected to the valve body 1, and the screw 141 is rotatably connected to the sealing sleeve 142. In specific implementation, the driving motor 3 can directly drive the screw 141 to rotate, and the solder paste can be mixed during the rotation process.

[0037] like Figure 1 and Figure 2As shown, the screw 141 is arranged along the length direction of the feed channel 14, and the valve body 1 is also provided with a feed pipe 4, one end of which is used to pass solder paste, and the other end of which is used to pass solder paste toward the feed channel 14. A sealing ring 143 is also arranged in the feed channel 14, and the sealing ring 143 is fixedly installed in the feed channel 14. The screw 141 is rotatably connected with the sealing ring 143, and a sealing ring is arranged in the sealing ring 143 corresponding to the screw 141, and the sealing ring abuts the screw 141. The position of the sealing ring 143 is arranged corresponding to the feed pipe 4, and a feed port 144 is opened on the sealing ring 143, one end of which is connected to the inside of the feed pipe 4, and the other end of which is connected to the feed channel 14.

[0038] This embodiment also provides an application process of a solder paste piezoelectric injection valve, including the above-mentioned solder paste piezoelectric injection valve, using the following steps: a. Pass solder paste from the feed pipe 4 into the feed channel 14; b. Start the screw 141 to stir the solder paste; c. Pass the solder paste in the feed flow channel 14 into the colloid flow channel 211; d. The sliding block is driven by the piezoelectric brake 12 so that the sliding block moves repeatedly to squeeze out the solder paste.

[0039] Working principle: After the solder paste passes into the feed pipe 4, it is sprayed out through the sliding block. During the feeding process, it is stirred by the screw 141, so that the solder paste is mixed more evenly, thereby improving the quality of the solder paste.

[0040] Embodiment 2 like Figure 3As shown, the main difference between Example 2 and Example 1 is that a mounting frame 17 and a sliding rod 171 are further provided on the valve body 1, the mounting frame 17 is fixedly connected to the piezoelectric brake 12, the piezoelectric brake 12 can push the sliding rod 171, and the sliding rod 171 is slidably connected to the mounting frame 17, and the sliding rod 171 is fixedly connected to the side of the feed pipe 4 with an auxiliary feed rod 173, the auxiliary feed rod 173 extends into the feed pipe 4 and is slidably connected to the feed pipe 4, and a hose 41 is provided on the side wall of the feed pipe 4, the hose 41 is connected to the feed pipe 4 and is used to pass solder paste, and the auxiliary feed rod 173 can block the connection between the hose 41 and the feed pipe 4 when extended. During specific implementation, a reset spring 172 for resetting the sliding rod 171 is also provided on the mounting frame 17. The reset spring 172 has a tendency to pull the sliding rod 171 toward the piezoelectric brake 12. When the piezoelectric brake 12 is started, the auxiliary feeding rod 173 moves upward. When the piezoelectric sensor stops, the auxiliary feeding rod 173 moves downward to push the solder paste, thereby realizing the auxiliary feeding of the solder paste and reducing the blockage of the feed pipe 4 by pressurizing. The auxiliary feeding rod 173 can move up and down with the starting frequency of the piezoelectric brake 12, that is, the frequency of the solder paste passing out, thereby realizing the control of the solder paste passing in and pressurizing the solder paste after the solder paste is passed in.

[0041] like Figure 3 As shown, one end of the auxiliary feed rod 173 extending into the feed pipe 4 is provided with a ball plug 174, which is used to block the connection between the hose 41 and the feed pipe 4. In specific implementation, the ball plug 174 can block the feed passage, and when there is no need to pass solder paste, the continuous introduction of solder paste can be reduced, which will cause the amount of solder paste in the valve body 1 to continue to increase, resulting in solder paste leakage, and further improve the stability of processing.

[0042] Working principle: The basic working principle is the same as that of the first embodiment, but an auxiliary feed rod 173 capable of controlling the passage of solder paste is added, which reduces the situation of excessive solder paste passage and the situation of solder paste blockage.

[0043] Embodiment 3 The main difference between the third embodiment and the second embodiment is that a stirring rod 175 is rotatably connected to the spherical plug 174, the stirring rod 175 is rotatably connected to the spherical plug 174, a stirring blade 176 is provided at one end of the stirring rod 175 away from the spherical plug 174, and an arc-shaped protrusion 177 is provided inside the feed pipe 4 corresponding to the spherical plug 174. In specific implementation, the stirring blade 176 can move up and down with the spherical plug 174, the stirring blade 176 is provided with two pieces and is symmetrically arranged along the stirring rod 175, and the arc-shaped protrusion 177 is also arranged corresponding to the two stirring blades 176, and can continuously contact the arc-shaped protrusion 177 during the movement process. During the movement process, the stirring blade 176 can continuously rotate along the guide of the arc-shaped protrusion 177. Since the up and down movement speed is fast when the solder paste is sprayed, the stirring blade 176 can also rotate at a faster speed, so that the solder paste is pre-stirred in the feed pipe 4.

[0044] Working principle: The basic working principle is the same as that of the second embodiment, but the solder paste in the feed tube 4 can be stirred in advance while feeding, so as to reduce the blockage caused by uneven mixing of the solder paste in the feed tube 4.

[0045] The above are preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A piezoelectric solder paste injection valve, comprising a valve body (1), characterized in that: A movable block (11) is arranged inside the valve body (1), the movable block (11) is slidably connected to the valve body (1), a piezoelectric brake (12) is also arranged on the valve body (1), the piezoelectric driver can drive the movable block (11) to slide up and down, a discharge head (2) is arranged on the lower side of the movable block (11) inside the valve body (1), the discharge head (2) is fixedly connected to the valve body (1), and a discharge hole (13) is opened on the lower side of the discharge head (2); The discharge head (2) is provided with a striker (21), the striker (21) is slidably connected to the valve body (1), the movable block (11) can push the striker (21) when sliding, the discharge head (2) is provided with a reset spring (22) corresponding to the striker (21), the reset spring (22) is fixedly connected to the discharge head (2), the reset spring (22) is fixedly connected to the striker (21), the reset spring (22) has a tendency to push the striker (21) to move toward the sliding block, and the striker (21) is used to push the solder paste to move toward the discharge hole (13); The valve body (1) is also provided with a feed channel (14), and the striker (21) is provided with a colloid channel (211) corresponding to the feed channel (14). One end of the colloid channel (211) is used to communicate with the feed channel (14), and the other end of the colloid channel (211) is used to discharge solder paste toward the discharge hole (13). A screw (141) is provided in the feed channel (14), and the screw (141) is rotatably connected to the valve body (1) and is used to stir the solder paste.

2. The solder paste piezoelectric injection valve according to claim 1, characterized in that: The valve body (1) is also provided with a driving motor (3), the rotating shaft of the driving motor (3) is fixedly connected to the screw rod (141), the driving motor (3) is fixedly connected to the valve body (1), a sealing cover (15) is also provided in the valve body (1) corresponding to the screw rod (141), the sealing cover (15) is fixedly connected to the valve body (1), the driving motor (3) is fixedly mounted on the sealing cover (15), the sealing cover (15) is provided with a clearance opening (151) corresponding to the rotating shaft, the valve body (1) is also provided with a sealing sleeve (142) corresponding to the screw rod (141), the sealing sleeve (142) is fixedly connected to the valve body (1), and the screw rod (141) is rotatably connected to the sealing sleeve (142).

3. The solder paste piezoelectric injection valve according to claim 2, characterized in that: The screw (141) is arranged along the length direction of the feed channel (14), and a feed pipe (4) is also arranged on the valve body (1). One end of the feed pipe (4) is used to pass solder paste, and the other end of the feed pipe (4) is used to pass solder paste toward the feed channel (14).

4. The solder paste piezoelectric injection valve according to claim 3, characterized in that: A sealing ring (143) is also provided in the feed channel (14). The sealing ring (143) is fixedly installed in the feed channel (14). The screw rod (141) is rotatably connected to the sealing ring (143). A sealing ring is provided in the sealing ring (143) corresponding to the screw rod (141), and the sealing ring abuts against the screw rod (141).

5. The solder paste piezoelectric injection valve according to claim 4, characterized in that: The sealing ring (143) is arranged at a position corresponding to the feed pipe (4), and a feed port (144) is provided on the sealing ring (143). One end of the feed port (144) is connected to the inside of the feed pipe (4), and the other end of the feed port (144) is connected to the feed channel (14).

6. The solder paste piezoelectric injection valve according to claim 1, characterized in that: A discharge space (16) is reserved between the striker (21) and the discharge hole (13); one end of the discharge space (16) is connected to the discharge hole (13), and the other end of the discharge space (16) is connected to the colloid flow channel (211); the solder paste in the discharge space (16) cannot drip out of the discharge hole (13) due to air pressure.

7. The solder paste piezoelectric injection valve according to claim 1, characterized in that: The piezoelectric brake (12) is provided with an electric field generator and a piezoelectric ceramic sheet. The electric field generator is used to form an electric field. The piezoelectric ceramic sheet is deformed after inducing the electric field to abut against and push the movable block (11).

8. The solder paste piezoelectric injection valve according to claim 7, characterized in that: The valve body (1) is also provided with a mounting frame (17) and a sliding rod (171). The mounting frame (17) is fixedly connected to the piezoelectric brake (12). The piezoelectric brake (12) can push the sliding rod (171), and the sliding rod (171) is slidably connected to the mounting frame (17). The sliding rod (171) is fixedly connected to an auxiliary feeding rod (173) on the side facing the feeding pipe (4). The auxiliary feeding rod (173) extends into the feeding pipe (4) and is slidably connected to the feeding pipe (4). A hose (41) is provided on the side wall of the feeding pipe (4). The hose (41) is connected to the feeding pipe (4) and is used to pass solder paste. When the auxiliary feeding rod (173) is extended, it can block the connection between the hose (41) and the feeding pipe (4).

9. The solder paste piezoelectric injection valve according to claim 8, characterized in that: One end of the auxiliary feeding rod (173) extending into the feeding pipe (4) is provided with a spherical plug (174), and the spherical plug (174) is used to seal the connection between the hose (41) and the feeding pipe (4).

10. An application process of a solder paste piezoelectric injection valve, characterized in that: The piezoelectric solder paste injection valve according to any one of claims 1 to 9 is provided, and the following steps are adopted: a. Pass solder paste from the feed pipe (4) into the feed channel (14); b. Start the screw (141) to stir the solder paste; c. Passing the solder paste in the feed flow channel (14) into the colloid flow channel (211); d. The sliding block is driven by the piezoelectric brake (12) so that the sliding block moves repeatedly to extrude the solder paste.

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