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CN-224221767-U - Piezoelectric dispensing injection valve

CN224221767UCN 224221767 UCN224221767 UCN 224221767UCN-224221767-U

Abstract

The utility model discloses a piezoelectric dispensing injection valve which comprises a valve body, a glue supply block, a nozzle, a firing pin, a piezoelectric cylinder and a lever, wherein the valve body is internally provided with a containing groove, the glue supply block is arranged outside the lower end of the valve body, the glue supply block is internally provided with a glue flow channel, the firing pin is matched with the nozzle, the piezoelectric cylinder is rotatably 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 below the lever, a fixing seat is sleeved outside the guide sleeve, the upper end of the firing pin is provided with a flange part, a first reset spring is arranged between the lower end face of the flange part and the bottom of the guide sleeve, a second reset spring is arranged outside the first reset spring and is positioned in the fixing seat, and the second reset spring coaxially arranged with the first reset spring is positioned between the lever and the fixing seat. The piezoelectric dispensing injection valve can not only provide the sensitivity of the striker resetting, but also improve the stability of the lever and the striker and the consistency of the impact force between the striker and the nozzle.

Inventors

  • CHEN XIAOFENG
  • CHEN YUCHEN
  • XU XIAOBO

Assignees

  • 苏州卓兆点胶股份有限公司

Dates

Publication Date
20260512
Application Date
20250514

Claims (7)

  1. 1. The piezoelectric dispensing injection valve comprises a valve body (10) with a containing groove (9) inside, a glue feeding block (2) arranged outside the lower end of the valve body (10) and internally provided with a glue runner (1), a nozzle (3), a firing pin (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 firing pin (4), and is characterized in that the glue feeding block (2), the valve body (10) and the nozzle (3) are connected through a connecting seat (6), the connecting seat (6) is respectively provided with a glue feeding runner (7) and a glue discharging runner (8) which are mutually communicated, one end of the glue feeding runner (7) far away from the glue discharging runner (8) is communicated with the glue runner (1) on the glue feeding block (2), and the lower end of the glue discharging runner (8) vertically extending far away from the glue feeding runner (7) is communicated with the nozzle (3); The lower end of the piezoelectric cylinder (11) is in rotary contact with the first groove (13) through a first bulge (12) which is matched with the lever (17), the first bulge (12) is close to the second bulge (171) and is positioned on one side of the second bulge (171) close to the striker (4), and the lower end of the striker (4), which is in contact with the lower surface of the end of the lever (17) far from the piezoelectric cylinder (11), passes through the glue outlet flow channel (8) of the connecting seat (6) and is in impact fit with the nozzle (3); The valve is characterized in that a guide sleeve (14) for a firing pin (4) to pass through is arranged in the valve body (10) and below the lever (17), a fixing seat (16) with an opening at the upper end is sleeved outside the guide sleeve (14), the upper end of the firing pin (4) is provided with a flange part (5) which is outwards along the radial direction, a first reset spring (151) is arranged between the lower end face 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 outside the first reset spring (151) and inside the fixing seat (16), and the second reset spring (152) which is coaxially arranged with the first reset spring (151) is arranged between the lower surface of the lever (17) and the bottom of the fixing seat (16).
  2. 2. The dispensing valve of claim 1, wherein at least 2 opposite side walls of the fixing base (16) are provided with an outwardly extending protrusion (161), and at least 2 hanging rods (162) corresponding to the protrusions (161) penetrate through the valve body (10) and are in hanging fit with the corresponding protrusions (161).
  3. 3. The piezoelectric dispensing injection valve of claim 2, wherein the lower end surface of the boss (161) is provided with an arc-shaped groove matched with the hanging rod (162).
  4. 4. The piezo-electric dispensing injection valve according to claim 1, wherein the lever (17) has an arcuate projection (173) on a lower surface of the lever (17) near one end of the striker (4) in contact with an upper end surface of the striker (4).
  5. 5. The dispensing valve of claim 1, wherein the surfaces of the second protrusion (171) and the second groove (172), and the surfaces of the first protrusion (12) and the first groove (13) are all arc surfaces.
  6. 6. The dispensing valve of claim 1, wherein the second recess (172) is formed on the lower surface of the lever (17), and the second protrusion (171) is formed on the inner wall of the accommodating groove (9).
  7. 7. The piezoelectric dispensing injection valve of claim 1, wherein 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 surface of the piezoelectric cylinder (11).

Description

Piezoelectric dispensing injection valve Technical Field The utility model relates to the technical field of dispensing, in particular to a piezoelectric dispensing injection valve. Background Piezoelectric jetting valves are commonly used for high precision, high consistency fluid control, for achieving non-contact fluid control, such as dispensing and jetting of glues and inks, wherein piezoelectric jetting dispensing valves are commonly used in the field of electronic packaging. Through searching, the patent with the publication number of CN213825643U discloses a high-speed fluid injection valve, which comprises a valve body with a containing cavity, a piezoelectric ceramic stack column body in the containing cavity, a swinging rod, a firing pin, a supporting spring, a second spring and a glue feeding mechanism, wherein the swinging rod is controlled by the piezoelectric ceramic stack column body in the containing cavity so as to control the firing pin to carry out glue dispensing on glue fed by the glue feeding mechanism, and then the swinging rod and the firing pin are reset by the supporting spring and the second spring so as to carry out next glue dispensing. In the above-mentioned patents, the stability of the oscillating lever and the striker in the high-speed fluid injection valve may be reduced during repeated high-speed movements, thereby reducing the accuracy of the glue discharge. Disclosure of utility model The utility model aims to solve the technical problem of providing the piezoelectric dispensing injection valve, which not only can provide the sensitivity of the striker resetting, but also can improve the stability of the lever and the striker and the consistency of the impact force between the striker and the nozzle, and improve the precision of the dispensing and the stability in the long-term use process. The technical scheme includes that the piezoelectric dispensing injection valve comprises a valve body, a glue supply block, a nozzle, a firing pin, a piezoelectric column and a lever, wherein the valve body is internally provided with a containing groove, the glue supply block is arranged outside the lower end of the valve body, the nozzle is internally provided with a glue runner, the firing pin is matched with the nozzle, the piezoelectric column is vertically arranged in the containing groove, the lever is rotatably connected between the lower end of the piezoelectric column and the upper end of the firing pin, the glue supply block, the valve body and the nozzle are connected through a connecting seat, the connecting seat is respectively provided with a glue inlet runner and a glue outlet runner which are mutually communicated, one end of the glue inlet runner far away from the glue outlet runner is communicated with the glue runner on the glue supply block, and the lower end of the glue outlet runner which vertically extends is far away from the glue inlet runner is communicated with the nozzle; The lower end of the piezoelectric cylinder is in rotary contact with the lever through a first bulge matched with the lever, the first bulge is close to the second bulge and is positioned on one side of the second bulge close to the firing pin, and the lower end of the firing pin, which is in contact with the lower surface of the end of the lever far from the piezoelectric cylinder, passes through a glue outlet flow channel of the connecting seat and is in collision fit with the nozzle; The valve body is internally provided with a guide sleeve through which a firing pin passes and positioned below the lever, the outer side of the guide sleeve is sleeved with a fixed seat with an opening at the upper end, the upper end of the firing pin is provided with a flange part which is radially outwards, a first reset spring is arranged between the lower end face of the flange part and the bottom of the guide sleeve or the fixed seat, a second reset spring is arranged outside the first reset spring and positioned in the fixed seat, and the second reset spring coaxially arranged with the first reset spring is positioned between the lower surface of the lever and the bottom of the fixed seat. The further improved scheme in the technical scheme is as follows: 1. In the above scheme, at least 2 opposite side walls of the fixing seat are respectively provided with an outwards extending protruding portion, and at least 2 hanging rods corresponding to the protruding portions penetrate through the valve body and are in hanging fit with the corresponding protruding portions. 2. In the scheme, an arc-shaped groove matched with the hanging rod is formed in the end face of the lower portion of the protruding portion. 3. In the scheme, the lower surface of the lever, which is close to one end of the firing pin, is provided with an arc-shaped protruding part which is contacted with the upper end surface of the firing pin. 4. In the above scheme, the surfaces of the second protrusion, the second groove, the fir