Piezoelectric dispensing injection valve

Abstract

The utility model discloses a piezoelectric type dispensing injection valve which comprises a valve body internally provided with a containing groove, a glue supply block arranged on the outer side of the lower end of the valve body and internally provided with a glue flow channel, a nozzle, a firing pin matched with the nozzle, a piezoelectric cylinder and a lever rotationally connected between the lower end of the piezoelectric cylinder and the upper end of the firing pin. A guide sleeve is arranged in the valve body and located below the lever, a fixing base is arranged on the outer side of the guide sleeve in a sleeved mode, a flange part is arranged at the upper end of the firing pin, a first reset spring is arranged between the lower end face of the flange part and the bottom of the guide sleeve, and a second reset spring is arranged on the outer side of the first reset spring and located in the fixing base. A second reset spring coaxial with the first reset spring is located between the lever and the fixing base. According to the piezoelectric type dispensing injection valve, the resetting sensitivity of the firing pin can be provided, and the stability of the lever and the firing pin and the consistency of the impact force between the firing pin and the nozzle can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the point gum technical field, especially point to a kind of piezoelectric type point gum injection valve. BACKGROUND

[0002] Piezoelectric injection valve is mostly used for high-precision, high-consistency fluid control, for realizing non-contact fluid control, such as glue and ink dispensing and injection, wherein piezoelectric injection dispensing valve is often used in electronic packaging field. Through retrieval, the patent with publication number CN213825643U discloses a kind of high-speed fluid injection valve, including the valve body with accommodating cavity, piezoelectric ceramic stack column body in accommodating cavity, swing lever, striker, support spring, second spring and glue feeding mechanism;The patent controls swing lever by piezoelectric ceramic stack column body in accommodating cavity, and then controls striker to carry out dispensing of glue water transported by glue feeding mechanism, and then support spring and second spring are reset to swing lever and striker to facilitate next dispensing. In the above-mentioned patent, the stability of swing lever and striker in high-speed fluid injection valve can be reduced during repeated high-frequency movement, and then the precision of glue output is reduced. SUMMARY

[0003] The technical problem to be solved by the utility model is to provide a kind of piezoelectric type point gum injection valve, the piezoelectric type point gum injection valve can provide the sensitivity of striker reset, can improve the stability of lever and striker and the consistency of impact degree between striker and nozzle, improve the precision of glue output and stability in long-term use.

[0004] To solve the above technical problems, the technical scheme adopted by the utility model is: a kind of piezoelectric type point gum injection valve, comprising: the valve body with accommodating groove in the inside, glue supply block with glue flow channel being arranged in the inside and being set on the outer side of the lower end of the valve body, nozzle, striker being cooperated with nozzle, piezoelectric column body being vertically set in accommodating groove and lever being rotatably connected between the lower end of piezoelectric column body and the upper end of striker, the glue supply block, the valve body and the nozzle are connected by a connecting seat, the connecting seat is respectively provided with the glue inlet flow channel and the glue outlet flow channel which are communicated with each other, the end of the glue inlet flow channel away from the glue outlet flow channel is communicated with the glue flow channel on the glue supply block, and the lower end of the vertically extending glue outlet flow channel away from the glue inlet flow channel is communicated with the nozzle.

[0005] The end of the lever away from the striker is rotatably connected between the inner wall of accommodating groove located below it by second protrusion and second groove matched with each other, the first protrusion and the first groove matched with each other are rotatably contacted between the lower end of piezoelectric column body and lever, the first protrusion is close to the second protrusion and located on the side of the second protrusion close to the striker, the lower end of the striker with upper end contacting the lower surface of the end of lever away from piezoelectric column body penetrates the glue outlet flow channel of connecting seat and is impact matched with nozzle.

[0006] The valve body is provided with a guide sleeve for the striker to pass through below the lever, the outer side of the guide sleeve is provided with a fixed seat with an open upper end, the upper end of the striker is provided with a radially outward flange part, the lower end surface of the flange part is provided with a first reset spring between the guide sleeve or the bottom of the fixed seat, the outer side of the first reset spring and in the fixed seat is provided with a second reset spring, the second reset spring coaxial with the first reset spring is located between the lower surface of the lever and the bottom of the fixed seat.

[0007] The further improved scheme in the above technical solution is as follows:

[0008] 1. In the above scheme, the fixed seat is provided with an outwardly extending protruding part on at least two opposite side walls, and at least two hanging rods corresponding to the protruding parts are arranged to pass through the valve body and are hung and matched with the corresponding protruding parts.

[0009] 2. In the above scheme, an arc-shaped groove matched with the hanging rod is formed on the end surface of the lower part of the protruding part.

[0010] 3. In the above scheme, the lower surface of the lever near one end of the striker is provided with an arc-shaped protruding part in contact with the upper end surface of the striker.

[0011] 4. In the above scheme, the mutually matched surfaces between the second protruding part and the second recess, and the first protruding part and the first recess are all arc surfaces.

[0012] 5. In the above scheme, the second recess is formed on the lower surface of the lever, and the second protruding part is arranged on the inner wall of the accommodating groove.

[0013] 6. In the above scheme, the first protruding part is integrally formed on the upper surface of the lever, and the first recess is formed on the lower end surface of the piezoelectric column.

[0014] Due to the use of the above technical solution, the utility model has the following advantages compared with the prior art:

[0015] The utility model discloses a piezoelectric type point glue injection valve, and the lower end of the striker which upper end contacts the lower surface of the lever far from one end of piezoelectric column body passes the glue outlet flow channel of connecting seat and impacts the cooperation with the nozzle, and the valve body is provided with a guide sleeve for the striker to pass through below the lever, the outer side of guide sleeve is provided with a fixed seat with upper end opening, the upper end of striker has a flange portion outward along the radial, and a first reset spring is arranged between the lower end surface of this flange portion and the bottom of guide sleeve or fixed seat, a second reset spring is arranged in the outer side of first reset spring and in fixed seat, and the second reset spring coaxial with first reset spring is located between the lower surface of lever and the bottom of fixed seat, through coaxial nesting arrangement of first reset spring and second reset spring, the stable superimposed force can be provided for the striker and lever synchronous reset upward under the action of reset spring, the sensitivity of striker reset can be provided, and the stability of lever and the striker synchronous movement with lever in the process of repeated high frequency movement and the consistency of impact intensity between striker and nozzle can be improved, the precision of glue outlet and stability in long-term use are improved, further, the fixed seat has a outward extending protruding portion on at least two opposite side walls, and at least two hanging rods corresponding with the protruding portion are passed through the valve body and are hung with the corresponding protruding portion, which is convenient for the positioning and installation of fixed seat, and can keep the relative independence between fixed seat and flow channel assembly, and the flow channel assembly is convenient for dismounting and replacing. BRIEF DESCRIPTION OF DRAWINGS

[0016] ATTACHED Figure 1 It is the structure schematic diagram of piezoelectric type point glue injection valve of the utility model;

[0017] ATTACHED Figure 2 It is the sectional view of piezoelectric type point glue injection valve of the utility model;

[0018] ATTACHED Figure 3 It is the utility model Figure 2 The local enlarged view of one structure in the utility model;

[0019] ATTACHED Figure 4 It is the local enlarged view of another structure in the utility model Figure 2 .

[0020] In the above drawing: 1, glue flow channel;2, glue supply block;3, nozzle;4, striker;5, flange portion;6, connecting seat;7, glue inlet flow channel;8, glue outlet flow channel;9, containing groove;10, valve body;11, piezoelectric column body;12, first protrusion;13, first recess;14, guide sleeve;151, first reset spring;152, second reset spring;16, fixed seat;161, protruding portion;162, hanging rod;17, lever;171, second protrusion;172, second recess;173, arc protruding portion. DETAILED DESCRIPTION

[0021] The present patent can be further understood by the specific embodiments given below, which are not intended to limit the present patent.

[0022] The piezoelectric dispensing valve comprises a valve body 10 with a containing groove 9, a glue supply block 2 with a glue flow channel 1 on the outer side of the lower end of the valve body 10, a nozzle 3, a striker 4 matched with the nozzle 3, a piezoelectric column 11 vertically arranged in the containing groove 9, and a lever 17 rotatably connected between the lower end of the piezoelectric column 11 and the upper end of the striker 4. The glue supply block 2, the valve body 10 and the nozzle 3 are connected through a connecting seat 6, and the connecting seat 6 is provided with a glue inlet flow channel 7 and a glue outlet flow channel 8 which are in communication with each other. The end of the glue inlet flow channel 7 away from the glue outlet flow channel 8 is in communication with the glue flow channel 1 on the glue supply block 2, and the lower end of the vertically extending glue outlet flow channel 8 away from the glue inlet flow channel 7 is in communication with the nozzle 3.

[0023] The end of the lever 17 away from the striker 4 is rotatably connected with the inner wall of the containing groove 9 below it through a second protrusion 171 and a second groove 172 matched with each other. The lower end of the piezoelectric column 11 is rotatably connected with the lever 17 through a first protrusion 12 and a first groove 13 matched with each other. The first protrusion 12 is close to the second protrusion 171 and located on the side of the second protrusion 171 close to the striker 4. The lower end of the striker 4, the upper end of which is in contact with the lower surface of the end of the lever 17 away from the piezoelectric column 11, penetrates the glue outlet flow channel 8 of the connecting seat 6 and is in impact matching with the nozzle 3.

[0024] A guide sleeve 14 through which the striker 4 penetrates is arranged in the valve body 10 below the lever 17. An upper end open fixing seat 16 is sleeved on the outer side of the guide sleeve 14. The upper end of the striker 4 has a flange part 5 extending radially outward. A first return spring 151 is arranged between the lower end surface of the flange part 5 and the bottom of the guide sleeve 14 or the fixing seat 16. A second return spring 152 is arranged on the outer side of the first return spring 151 and in the fixing seat 16. The second return spring 152 coaxially arranged with the first return spring 151 is located between the lower surface of the lever 17 and the bottom of the fixing seat 16.

[0025] The fixing seat 16 has a protrusion 161 extending outward on at least two opposite side walls. At least two hanging rods 162 corresponding to the protrusion 161 penetrate the valve body 10 and are in hanging matching with the corresponding protrusion 161. An arc-shaped groove matched with the hanging rod 162 is arranged on the end surface of the lower part of the protrusion 161.

[0026] The lower surface of the end of the lever 17 close to the striker 4 has an arc-shaped protrusion 173 in contact with the upper end surface of the striker 4.

[0027] The piezoelectric point glue injection valve comprises a valve body 10 with a containing groove 9, a glue supply block 2 with a glue flow channel 1 on the outer side of the lower end of the valve body 10, a nozzle 3, a striker 4 matched with the nozzle 3, a piezoelectric column 11 vertically arranged in the containing groove 9, and a lever 17 rotatably connected between the lower end of the piezoelectric column 11 and the upper end of the striker 4.

[0028] The end of the lever 17 away from the striker 4 is rotatably connected with the inner wall of the containing groove 9 below the lever 17 through a second protrusion 171 and a second groove 172 matched with each other, the lower end of the piezoelectric column 11 is rotatably contacted with the lever 17 through a first protrusion 12 and a first groove 13 matched with each other, the first protrusion 12 is close to the second protrusion 171 and located on the side of the second protrusion 171 close to the striker 4, the lower end of the striker 4 with the upper end of the lever 17 rotatably contacted with the lower surface of the end of the piezoelectric column 11 passes through the glue flow channel 8 of the connecting seat 6 and is matched with the nozzle 3 for impact.

[0029] A guide sleeve 14 through which the striker 4 passes is arranged in the valve body 10 below the lever 17, an upper-end-opened fixing seat 16 is sleeved on the outer side of the guide sleeve 14, the upper end of the striker 4 has a flange part 5 outward in the radial direction, a first reset spring 151 is arranged between the lower end surface of the flange part 5 and the bottom of the guide sleeve 14 or the fixing seat 16, a second reset spring 152 is arranged on the outer side of the first reset spring 151 and in the fixing seat 16, the second reset spring 152 coaxially arranged with the first reset spring 151 is located between the lower surface of the lever 17 and the bottom of the fixing seat 16.

[0030] The surfaces matched with each other between the second protrusion 171 and the second groove 172 and between the first protrusion 12 and the first groove 13 are all circular arc surfaces, the second groove 172 is arranged on the lower surface of the lever 17, and the second protrusion 171 is arranged on the inner wall of the containing groove 9.

[0031] The first protrusion 12 is integrally formed on the upper surface of the lever 17, and the first groove 13 is arranged on the lower end surface of the piezoelectric column 11.

[0032] The glue supply block, the nozzle and the connecting seat are assembled into a complete flow channel assembly through connecting members such as bolts, and the flow channel assembly is installed to the lower end of the valve body through the connecting seat.

[0033] The glue enters the glue inlet channel of the connecting seat after passing through the glue inlet channel of the glue supply block, and then enters the glue outlet channel. The lower end of the striker matched with the nozzle penetrates into the glue outlet channel and repeatedly strikes the nozzle to spray the glue in the glue outlet channel out of the lower end of the nozzle for dispensing operation. Specifically, the piezoelectric column expands downward to form a pushing force on one end of the lever after being electrified, so that the other end of the lever rotating around the second protrusion pushes the striker downward to strike the nozzle to dispense glue; the piezoelectric column retracts after being de-energized, and the first reset spring and the second reset spring nested with each other are reset respectively to make the striker and the lever return to the initial position; the excitation voltage of the piezoelectric column is a square wave, so that the striker makes high-speed reciprocating motion under the action of the piezoelectric column, so that the glue solution can be continuously sprayed out of the nozzle.

[0034] By coaxially nesting the first reset spring and the second reset spring, stable and superimposed force can be provided for the striker and the lever that are reset and moved upward synchronously under the action of the reset spring, which can not only provide sensitivity of the striker reset, but also improve the stability of the lever and the striker moving synchronously with the lever during repeated high-frequency movement, and the consistency of the impact force between the striker and the nozzle, thereby improving the accuracy of glue dispensing and stability during long-term use.

[0035] When the piezoelectric dispensing injection valve is used, the first reset spring and the second reset spring are coaxially nested, which can provide stable and superimposed force for the striker and the lever that are reset and moved upward synchronously under the action of the reset spring, which can not only provide sensitivity of the striker reset, but also improve the stability of the lever and the striker moving synchronously with the lever during repeated high-frequency movement, and the consistency of the impact force between the striker and the nozzle, thereby improving the accuracy of glue dispensing and stability during long-term use. Further, the fixed seat has at least two outwardly extending protrusions on the side walls of the at least two opposite sides, and at least two hanging rods corresponding to the protrusions penetrate through the valve body and are hung with the corresponding protrusions, which not only facilitates positioning and installation of the fixed seat, but also maintains the relative independence between the fixed seat and the flow channel assembly, facilitating disassembly and replacement of the flow channel assembly.

[0036] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A piezoelectric dispensing valve, comprising: The valve body (10) with an internal receiving groove (9), the glue supply block (2) located on the lower outer side of the valve body (10) and having a glue flow channel (1) inside, the nozzle (3), the striking pin (4) cooperating with the nozzle (3), the piezoelectric column (11) vertically arranged in the receiving groove (9), and the lever (17) rotatably connected between the lower end of the piezoelectric column (11) and the upper end of the striking pin (4), characterized in that: the glue supply block (2), the valve body (10) and the nozzle (3) are connected by a connecting seat (6), the connecting seat (6) has a glue inlet channel (7) and a glue outlet channel (8) that are interconnected, the glue inlet channel (7) is connected to the glue flow channel (1) on the glue supply block (2) at one end away from the glue outlet channel (8), and the glue outlet channel (8) extending vertically is connected to the nozzle (3) at the lower end away from the glue inlet channel (7). The lever (17) is rotatably connected to the inner wall of the receiving groove (9) below it via a second protrusion (171) and a second groove (172) that cooperate with each other. The lower end of the piezoelectric column (11) is rotatably contacted to the lever (17) via a first protrusion (12) and a first groove (13) that cooperate with each other. The first protrusion (12) is close to the second protrusion (171) and is located on the side of the second protrusion (171) that is close to the striker (4). The lower end of the striker (4), whose upper end is in contact with the lower surface of the lever (17) away from the piezoelectric column (11), passes through the glue outlet channel (8) of the connecting seat (6) and impacts the nozzle (3). A guide sleeve (14) for the striker (4) to pass through is provided inside the valve body (10) and below the lever (17). A fixed seat (16) with an open upper end is fitted on the outer side of the guide sleeve (14). The upper end of the striker (4) has a flange (5) that extends radially outward. A first return spring (151) is provided between the lower end face of the flange (5) and the bottom of the guide sleeve (14) or the fixed seat (16). A second return spring (152) is provided outside the first return spring (151) and inside the fixed seat (16). The second return spring (152) is coaxially arranged with the first return spring (151) and located between the lower surface of the lever (17) and the bottom of the fixed seat (16).

2. The piezoelectric dispensing valve according to claim 1, characterized in that: The fixing seat (16) has an outwardly extending protrusion (161) on at least two opposite side walls, and at least two hanging rods (162) corresponding to the protrusions (161) pass through the valve body (10) and are engaged with the corresponding protrusions (161).

3. The piezoelectric dispensing valve according to claim 2, characterized in that: An arc-shaped groove that mates with the hanging rod (162) is provided on the lower end face of the protrusion (161).

4. The piezoelectric dispensing valve according to claim 1, characterized in that: The lever (17) has an arc-shaped protrusion (173) on the lower surface of the end near the striker (4) that contacts the upper end face of the striker (4).

5. The piezoelectric dispensing valve according to claim 1, characterized in that: The surfaces that mate with each other between the second protrusion (171) and the second groove (172), and between the first protrusion (12) and the first groove (13), are all arc surfaces.

6. The piezoelectric dispensing valve according to claim 1, characterized in that: The second groove (172) is formed on the lower surface of the lever (17), and the second protrusion (171) is provided on the inner wall of the receiving groove (9).

7. The piezoelectric dispensing valve according to claim 1, characterized in that: The first protrusion (12) is integrally formed on the upper surface of the lever (17), and the first groove (13) is formed on the lower end face of the piezoelectric column (11).

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