CN111632797B

CN111632797B - Nozzle-adjustable self-adaptive piezoelectric injection valve

Info

Publication number: CN111632797B
Application number: CN202010525576.5A
Authority: CN
Inventors: 史玉雪; 张煌圣; 郭立才; 龙小波
Original assignee: Dongguan Jiyun Automation Technology Co ltd
Current assignee: Dongguan Jiyun Automation Technology Co ltd
Priority date: 2020-06-10
Filing date: 2020-06-10
Publication date: 2021-05-07
Anticipated expiration: 2040-06-10
Also published as: CN111632797A

Abstract

The invention belongs to the technical field of piezoelectric injection valves, and particularly relates to a nozzle-adjustable self-adaptive piezoelectric injection valve which comprises a valve body, a valve seat, an adjusting mechanism and a controller, wherein the valve seat is detachably connected to the valve body, the valve seat is in threaded connection with a gear nut, a nozzle is arranged in the gear nut, the gear nut can adjust the upper position and the lower position of the nozzle through rotation, the adjusting mechanism comprises a servo motor and a transmission gear set, the servo motor is fixedly arranged on the valve body and is electrically connected with the controller, and the servo motor is in transmission connection with the gear nut through the transmission gear set. Compared with the prior art, the automatic dispensing device has the advantages that the automatic adjustment of the position between the nozzle and the firing pin is realized by arranging the adjusting mechanism and the controller, the dispensing consistency is greatly improved, in addition, the automatic compensation can be carried out on the position of the nozzle, the dispensing precision is improved, and the service life of the device is prolonged.

Description

Nozzle-adjustable self-adaptive piezoelectric injection valve

Technical Field

The invention belongs to the technical field of piezoelectric injection valves, and particularly relates to a nozzle-adjustable self-adaptive piezoelectric injection valve.

Background

The piezoelectric injection valve utilizes the characteristics of piezoelectric materials, generates mechanical force through voltage, and controls the opening and closing of the valve, and can inject a trace amount of liquid materials at high speed due to extremely small space for opening and closing the valve and extremely high piezoelectric action frequency, so that the piezoelectric injection valve is widely applied to the dispensing field with high precision and high reliability.

At present, a piezoelectric injection valve needs to be periodically disassembled, cleaned and maintained, in order to adapt to high-precision dispensing, the relative position between a nozzle and a firing pin needs to be strictly controlled in the assembling process of the piezoelectric injection valve, in the prior art, the position between the nozzle and the firing pin is mainly adjusted manually, and the nozzle is driven to move by manually adjusting an adjusting nut at the nozzle, but because the sensitivity of manual work to pressure is different, certain deviation exists between the position of the nozzle and the position of the firing pin during reloading, and the volume of glue sprayed by different piezoelectric injection valves is different in the batch production process, so that the consistency of products is affected, wherein if the positions of the firing pin and the nozzle are too large, the firing pin cannot contact with the nozzle, so that the glue is easily leaked; if the positions of the firing pin and the nozzle are too small, the motion stroke of the firing pin is small, the jetting force is small, the reaction force of the firing pin on the piezoelectric ceramic is large, the piezoelectric ceramic is easy to damage, and the firing pin and the nozzle are abraded in the jetting process when the jetting valve jets some glue containing particles, such as fluorescent powder glue and the like, so that the gap between the firing pin and the nozzle is changed, and the volume of the jetted glue is influenced.

To this end, the present invention proposes a piezoelectric injection valve solution that adjusts the position of the striker and the nozzle by means of a servo motor.

Disclosure of Invention

The invention aims to: aiming at the defects of the prior art, the provided nozzle-adjustable self-adaptive piezoelectric injection valve effectively solves the problems of poor precision and poor consistency of the traditional manual adjustment and realizes the functions of full-automatic correction of the position of the nozzle and automatic position compensation.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a self-adaptation piezoelectricity injection valve with adjustable nozzle, includes valve body, disk seat, guiding mechanism and controller, disk seat detachably connect in the valve body, disk seat threaded connection has gear nut, be provided with the nozzle among the gear nut, gear nut is adjustable through the rotating the upper and lower position of nozzle, guiding mechanism includes servo motor and drive gear group, servo motor fixed mounting in the valve body, and with controller electric connection, servo motor with gear nut passes through drive gear group transmission is connected.

As an improvement on the nozzle-adjustable self-adaptive piezoelectric injection valve, the transmission gear set comprises a first transmission gear and a second transmission gear, the output end of the servo motor penetrates through the valve seat to be connected with the first transmission gear, the second transmission gear is fixed on the valve seat, and the gear nut, the first transmission gear and the second transmission gear are meshed and connected with each other. According to the invention, different output torques can be selected among the gear nut, the first transmission gear and the second transmission gear according to specific adjustment requirements, so that the adjustability is improved.

As an improvement on the nozzle-adjustable self-adaptive piezoelectric injection valve, the valve seat comprises a valve seat body and a nozzle mounting part, a propping block for limiting the nozzle is arranged in the gear nut, and the nozzle is mounted on the nozzle mounting part through the gear nut. The gear nut is in threaded connection with the nozzle mounting part, and the nozzle is fixed in the gear nut, so that the gear nut can rotate forwards or reversely through transmission of the transmission gear set, and the function of adjusting the vertical position of the nozzle is realized.

As an improvement of the nozzle-adjustable self-adaptive piezoelectric injection valve, a liquid storage cavity and a flow channel are arranged in the valve seat body, and the nozzle mounting part and the flow channel are communicated with the liquid storage cavity. The flow channel is used for conveying glue solution; the liquid storage cavity is used for storing glue liquid, and the glue liquid is sprayed out of the nozzle after the striker vibrates at high frequency, so that the glue dispensing operation is realized.

As an improvement on the nozzle-adjustable self-adaptive piezoelectric injection valve, the valve seat body is further provided with a feeding interface, the feeding interface is connected with a charging barrel, and the charging barrel is communicated with the flow channel through the feeding interface. The feeding interface is connected with the material cylinder and can be used for connecting the glue solution in the material cylinder into the flow channel, so that the glue solution flows into the liquid storage cavity.

As an improvement on the nozzle-adjustable self-adaptive piezoelectric injection valve, a cleaning port is formed in the side face, close to the feeding interface, of the valve seat body, the cleaning port is communicated with the flow channel, and a plug is arranged at the cleaning port in a sealing mode. The washing mouth can be used to the washing in runner and stock solution chamber, and in addition, the end cap is the detachable setting, and after finishing washing, through stopping up the end cap will wash the mouth, guarantee the sealed effect of washing mouth department.

As an improvement of the nozzle-adjustable self-adaptive piezoelectric injection valve, one end of the flow channel close to the feeding interface is higher than one end of the flow channel close to the liquid storage cavity. Thus, the glue solution can better flow into the liquid storage cavity, and the flow rate of the glue solution is improved.

As an improvement of the nozzle-adjustable self-adaptive piezoelectric injection valve, a piezoelectric driving mechanism and a mounting seat are arranged in the valve body, a firing pin is arranged in the mounting seat, the upper end of the firing pin is abutted against the piezoelectric driving mechanism, and the lower end of the firing pin is accommodated in the liquid storage cavity.

As an improvement of the nozzle-adjustable adaptive piezoelectric injection valve, the piezoelectric driving mechanism includes a piezoelectric block, a lever body and a return spring, the lever body is fixedly mounted on the valve body, the piezoelectric block abuts against a short arm of the lever body, the return spring is sleeved on the firing pin, an upper end of the return spring abuts against a long arm of the lever body, and a lower end of the return spring abuts against an inner wall of the valve body. The lever body plays a role of an amplifier, amplifies high-frequency vibration of the piezoelectric block during working, and then drives the firing pin to vibrate in a reciprocating mode at high frequency.

As an improvement on the nozzle-adjustable self-adaptive piezoelectric injection valve, a buffer cushion block is arranged between the piezoelectric block and the inner wall of the valve body. The buffer cushion block is additionally arranged, so that a certain damping and buffering effect can be achieved on the piezoelectric block, and the vibration effect of the piezoelectric block on the valve body during working is reduced.

Compared with the prior art, the invention has at least the following beneficial effects:

1) the invention is provided with an adjusting mechanism and a controller, the gear nut is driven to rotate under the action of the servo motor and the transmission gear set, so as to adjust the position of the nozzle, and in the process of disassembling, washing and reassembling the nozzle between a single piezoelectric injection valve or a plurality of different piezoelectric injection valves, the servo motor controls and adjusts the positions of the nozzle and the striker through torque feedback, so that the gaps between the nozzle and the striker are kept consistent, the same volume of the injected glue solution is ensured, and the consistency of glue dispensing is greatly improved;

2) in the process of injecting glue solution by the injection valve, the firing pin impacts the nozzle to generate vibration, and the vibration effect can cause the micro displacement of the nozzle;

3) the invention controls the position of the nozzle by the servo motor, can realize the automatic compensation of the position of the nozzle, greatly reduces the risk of precision reduction caused by the abrasion of the firing pin or the nozzle, and improves the service life of the device and the dispensing quality.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view taken at A in FIG. 1;

wherein, 1-valve body; 2-valve seat; 3-an adjusting mechanism; 4-a controller; 5-a nozzle; 6-gear nut; 7-a barrel; 8-a firing pin; 9-cushion blocks; 11-a mounting seat; 12-a piezoelectric stack; 13-a lever body; 14-a return spring; 21-a valve seat body; 22-a nozzle mounting portion; 31-a servo motor; 32-a drive gear set; 61-a top abutting block; 211-a reservoir chamber; 212-a flow channel; 213-feed interface; 214-a purge port; 215-plug; 321-a first transmission gear; 322-second transmission gear.

Detailed Description

As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal ", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The present invention will be described in further detail below with reference to the accompanying drawings, but the present invention is not limited thereto.

As shown in fig. 1-2, a nozzle-adjustable self-adaptive piezoelectric injection valve, including a valve body 1, a valve seat 2, an adjusting mechanism 3 and a controller 4, the valve seat 2 is detachably connected to the valve body 1, the valve seat 2 is in threaded connection with a gear nut 6, a nozzle 5 is arranged in the gear nut 6, the gear nut 6 can adjust the upper and lower positions of the nozzle 5 by rotating, the adjusting mechanism 3 includes a servo motor 31 and a transmission gear set 32, the servo motor 31 is fixedly installed in the valve body 1 and is electrically connected with the controller 4, and the servo motor 31 is in transmission connection with the gear nut 6 through the transmission gear set 32. In this embodiment, the servo motor 31 is used in cooperation with the controller 4, and the transmission gear set 32 is driven by the servo motor 31 to further drive the gear nut 6 to rotate, so that the nozzle 5 moves up and down to be adjusted to a corresponding position, the relative position of the nozzle 5 and the striker 8 is ensured, and the dispensing precision and consistency are improved.

Preferably, the transmission gear set 32 includes a first transmission gear 321 and a second transmission gear 322, the output end of the servo motor 31 passes through the valve seat 2 and is connected with the first transmission gear 321, the second transmission gear 322 is fixed on the valve seat 2, and the gear nut 6, the first transmission gear 321 and the second transmission gear 322 are engaged with each other. In the present embodiment, different output torques can be selected among the gear nut 6, the first transmission gear 321 and the second transmission gear 322 according to specific adjustment requirements, so as to improve the adjustability.

Preferably, the valve seat 2 includes a valve seat body 21 and a nozzle mounting portion 22, a stopper 61 for limiting the nozzle 5 is provided inside the gear nut 6, and the nozzle 5 is mounted on the nozzle mounting portion 22 through the gear nut 6. The gear nut 6 is connected with the nozzle mounting part 22 by screw threads, and the nozzle 5 is fixed in the gear nut 6, therefore, the gear nut 6 can rotate forwards or backwards through the transmission of the transmission gear set 32, thereby realizing the function of adjusting the up-down position of the nozzle 5.

Preferably, the valve seat body 21 is provided with a liquid storage cavity 211, a flow channel 212 and a feeding interface 213, wherein the liquid storage cavity 211 and the flow channel 212 are arranged inside the valve seat body 21, the feeding interface 213 is connected with the cartridge 7, and the cartridge 7, the flow channel 212, the liquid storage cavity 211 and the nozzle mounting part 22 are sequentially communicated. The cartridge 7 is used for containing glue solution, the flow channel 212 is used for conveying the glue solution in the cartridge 7, and the liquid storage cavity 211 is used for storing the glue solution conveyed by the flow channel 212 and spraying the glue solution to the outside of the nozzle 5 through the vibration action of the striker 8. In addition, in order to facilitate the flowing of the glue solution, in this embodiment, the end of the flow channel 212 close to the feeding port 213 is higher than the end of the flow channel close to the liquid storage cavity 211, so that the glue solution in the cartridge 7 can easily flow into the liquid storage cavity 211 according to the liquid level difference, and the glue solution is prevented from being solidified in the flow channel 212 to block the flow channel 212.

Preferably, the valve seat body 21 is provided with a cleaning port 214 on a side surface close to the feeding port 213, the cleaning port 214 is communicated with the flow passage 212, and a plug 215 is hermetically arranged at the cleaning port 214. The flow channel 212, the liquid storage cavity 211 and the nozzle 5 are easy to be blocked due to the adhesive liquid, so that the cleaning port 214 can be arranged for cleaning the flow channel regularly, and the blocking phenomenon is reduced; after the cleaning is finished, the cleaning opening 214 can be blocked by the plug 215, so that the sealing effect of the cleaning opening 214 is ensured.

Preferably, a piezoelectric driving mechanism and a mounting seat 11 are arranged inside the valve body 1, a firing pin 8 is arranged in the mounting seat 11, the upper end of the firing pin 8 is abutted against the piezoelectric driving mechanism, and the lower end of the firing pin is accommodated in the liquid storage cavity 211; the piezoelectric driving mechanism comprises a piezoelectric block 12, a lever body 13 and a return spring 14, the lever body 13 is fixedly installed on the valve body 1, the piezoelectric block 12 is abutted against a short arm of the lever body 13, the return spring 14 is sleeved on the striker 8, the upper end of the return spring 14 is abutted against a long arm of the lever body 13, and the lower end of the return spring is abutted against the inner wall of the valve body 1. The lever body 13 plays a role of an amplifier, and can amplify the high-frequency vibration of the piezoelectric block 12 during working, so as to drive the striker 8 to vibrate in a high-frequency reciprocating manner.

Preferably, a cushion pad 9 is arranged between the piezoelectric block 12 and the inner wall of the valve body 1. The buffer cushion block 9 is additionally arranged, so that a certain damping and buffering effect can be achieved on the piezoelectric block 12, and the vibration effect caused by the piezoelectric block 12 to the valve body 1 during working is reduced.

The working principle of the invention is as follows: the nozzle 5 which is disassembled and washed is fixed on the gear nut 6 again, the gear nut 6 is screwed on the nozzle mounting part 22, the servo motor 31 works to drive the transmission gear set 32 to drive the gear nut 6 to rotate, in the process, the servo motor 31 sends torque feedback to the controller 4, and the controller 4 receives a feedback signal and controls the start and stop of the servo motor 31 to enable the nozzle 5 to stay at a proper position; when spraying common glue solution or large-particle glue solution, the servo motor 31 also adjusts the position of the nozzle 5 through torque feedback, and realizes automatic compensation for the position of the nozzle 5.

The foregoing description shows and describes several preferred embodiments of the invention, but as aforementioned, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a self-adaptation piezoelectricity injection valve with adjustable nozzle which characterized in that: including valve body (1), disk seat (2), guiding mechanism (3) and controller (4), disk seat (2) detachably connect in valve body (1), disk seat (2) threaded connection has gear nut (6), be provided with nozzle (5) in gear nut (6), gear nut (6) are adjustable through the rotating the upper and lower position of nozzle (5), guiding mechanism (3) include servo motor (31) and drive gear group (32), servo motor (31) fixed mounting in valve body (1), and with controller (4) electric connection, servo motor (31) with gear nut (6) pass through drive gear group (32) transmission is connected, wherein, drive gear group (32) include first drive gear (321) and second drive gear (322), the output of servo motor (31) passes disk seat (2) with first drive gear (321) And the second transmission gear (322) is fixed on the valve seat (2), and the gear nut (6), the first transmission gear (321) and the second transmission gear (322) are meshed and connected with each other.

2. The nozzle-adjustable adaptive piezoelectric inj ection valve as claimed in claim 1, wherein: the valve seat (2) comprises a valve seat body (21) and a nozzle mounting part (22), the gear nut (6) is internally provided with a propping block (61) for limiting the nozzle (5), and the nozzle (5) is installed in the nozzle mounting part (22) through the gear nut (6).

3. The nozzle-adjustable adaptive piezoelectric inj ection valve as claimed in claim 2, wherein: the inside stock solution chamber (211) and runner (212) that are provided with of valve seat body (21), nozzle installation department (22) with runner (212) all with stock solution chamber (211) intercommunication.

4. The nozzle-adjustable adaptive piezoelectric inj ection valve as claimed in claim 3, wherein: the valve seat body (21) is further provided with a feeding interface (213), the feeding interface (213) is connected with a charging barrel (7), and the charging barrel (7) is communicated with the flow channel (212) through the feeding interface (213).

5. The nozzle-adjustable adaptive piezoelectric inj ection valve as claimed in claim 4, wherein: the side face, close to the feeding interface (213), of the valve seat body (21) is provided with a cleaning opening (214), the cleaning opening (214) is communicated with the flow channel (212), and a plug (215) is arranged at the cleaning opening (214) in a sealing mode.

6. The nozzle-adjustable adaptive piezoelectric inj ection valve as claimed in claim 4, wherein: the flow channel (212) is higher at one end close to the feeding interface (213) than at one end close to the liquid storage cavity (211).

7. The nozzle-adjustable adaptive piezoelectric inj ection valve as claimed in claim 3, wherein: the valve body (1) is internally provided with a piezoelectric driving mechanism and a mounting seat (11), a firing pin (8) is arranged in the mounting seat (11), the upper end of the firing pin (8) is abutted to the piezoelectric driving mechanism, and the lower end of the firing pin is accommodated in the liquid storage cavity (211).

8. The nozzle-adjustable adaptive piezoelectric inj ection valve as claimed in claim 7, wherein: the piezoelectric driving mechanism comprises a piezoelectric block (12), a lever body (13) and a return spring (14), the lever body (13) is fixedly installed on the valve body (1), the piezoelectric block (12) is abutted to a short arm of the lever body (13), the return spring (14) is sleeved on the firing pin (8), the upper end of the return spring (14) is abutted to a long arm of the lever body (13), and the lower end of the return spring is abutted to the inner wall of the valve body (1).

9. The nozzle-adjustable adaptive piezoelectric inj ection valve as claimed in claim 8, wherein: and a buffer cushion block (9) is arranged between the piezoelectric block (12) and the inner wall of the valve body (1).