CN109433505A - A kind of fluid injection valve - Google Patents
A kind of fluid injection valve Download PDFInfo
- Publication number
- CN109433505A CN109433505A CN201811421744.5A CN201811421744A CN109433505A CN 109433505 A CN109433505 A CN 109433505A CN 201811421744 A CN201811421744 A CN 201811421744A CN 109433505 A CN109433505 A CN 109433505A
- Authority
- CN
- China
- Prior art keywords
- runner
- end lever
- lever
- injection valve
- fluid injection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 39
- 238000002347 injection Methods 0.000 title claims abstract description 32
- 239000007924 injection Substances 0.000 title claims abstract description 32
- 239000000919 ceramic Substances 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims description 14
- 238000010304 firing Methods 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 6
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
- B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
- B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
- B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
Landscapes
- Nozzles (AREA)
Abstract
The present invention is suitable for micro-amounts of liquids injection apparatus field, provide a kind of fluid injection valve, compared to existing fluid injection valve, there is the upper end lever and lower end lever that can be swung up and down inside fluid injection valve of the invention, body top, which has, adjusts screw, the adjusting screw is turned, it can be up and down.Screw is adjusted while up and down, bottom presses upper end lever, to make the run-off the straight relative to horizontal direction of upper end lever, lever horizontally tilted angular dimension in upper end directly affects the angular range of Piezoelectric Ceramic lower end lever swing.If lower end lever is subjected to displacement deviation, adjusting screw only need to be turned, the angular range of lower end lever swing can be adjusted, to correct the upper and lower displacement deviation of lower end lever.As it can be seen that the present invention, which only needs to turn adjusting screw, can be realized quick corrective operations, task difficulty is small.Meanwhile adjusting screw and being located at body top, periphery does not have object to hinder debugging operations convenient and efficient.
Description
Technical field
The invention belongs to micro-amounts of liquids injection apparatus field more particularly to a kind of fluid injection valves.
Background technique
Fluid injection valve is a kind of device that can eject denier fluent material at a high speed, can be applied to microelectronics envelope
Dress.And fluid injection valve can be divided into pneumatic type, piezoelectric type according to power source difference.Piezoelectric material is utilized in piezoelectric type injection valve
Inverse piezoelectric effect, injection frequency is high, device structure is simple, and injection can obtain the diameter as low as glue point of 0.2mm；It is another
The control precision of aspect, piezoelectric structure is high, and injection dispensing quality can be improved.
In prolonged operation process, the offset deviation of up and down direction can occur for the lever for directly hitting striker, thus
It needs to debug it.Current fluid injection valve, is debugged using end portion, without specific tuning parameter, and is being adjusted
It will increase task difficulty during examination, need repeatedly or debugging for a long time could be completed, occur exception in process of production
Reason problem needs more time.
Summary of the invention
Technical problem to be solved by the present invention lies in provide a kind of fluid injection valve, it is intended to fluid spray in the prior art
It is big to penetrate task difficulty present in the end portion debugging structure of valve, spends the problem that the time is long.
The invention is realized in this way a kind of fluid injection valve, including valve body, piezoelectric ceramics, striker, lower end lever, hit
Needle spring and flow channel component, the flow channel component include runner, material chamber, nozzle and nozzle retaining cap, tool in the valve body
There is cavity, the piezoelectric ceramics is vertically arranged in the cavity；The connecting pin of the lower end lever can be put by the first pin
It installs in the cavity dynamicly, and the connection end in contact of the bottom end of the piezoelectric ceramics and the lower end lever, the pressure
Electroceramics can drive the swinging end of the lower end lever to swing up and down, and the swinging end of the lower end lever is located at the upper of the striker
Side, can hit the striker；The firing pin spring bottom end is fixed in the cavity by positioning screw, and the striker
Spring pocket is set on the upper end periphery of the striker, and the top of the striker guided missile presses the head of the striker；The runner
Component is installed on the bottom of the valve body, and the striker protrudes into that the material is intracavitary, and it is intracavitary that the outlet of the runner accesses the material；
The nozzle is installed below the material chamber by the nozzle retaining cap；The fluid injection valve further include adjust screw and
The connecting pin of upper end lever, the upper end lever is swingably installed on the cavity top position by the second pin, described
It adjusts screw thread and is connected to the body top, the bottom end for adjusting screw is protruded into the cavity, and described in capable of pressing
The swinging end of upper end lever.
Further, the upper end lever and lower end lever are laterally arranged, and the connecting pin of the upper end lever is swung
End is located at its left and right ends, and the connecting pin of the lower end lever, swinging end are located at its left and right ends；The piezoelectricity pottery
Porcelain is integrally in the form of a column, and top corresponds to the lower section of upper end lever connecting pin, and bottom end corresponds to lower end lever connecting pin
Top.
Further, the bottom of the connecting pin of the upper end lever is equipped with the first arcuation concave surface, the top of the piezoelectric ceramics
End has the first arcuation protrusion, and the first arcuation protrusion is embedded in just in first arcuation concave surface；The upper end lever
The top of connecting pin is equipped with the second arcuation concave surface, and the bottom of second pin is embedded in just in second arcuation concave surface.
Further, the top of the connecting pin of the lower end lever is equipped with the second arcuation protrusion, the bottom of the piezoelectric ceramics
End has third arcuation concave surface, and the second arcuation protrusion is embedded in just in third arcuation concave surface；The lower end lever
The bottom of connecting pin is equipped with the 4th arcuation concave surface, and the top of first pin is embedded in just in the 4th arcuation concave surface.
Further, the length scale being spaced apart in the vertical direction is provided on the periphery for adjusting screw.
Further, the flow channel component further includes female Luer, flow path bodies, runner plug and runner fluid chamber,
The runner is set in the flow path bodies, and the runner plug blocks one end of the runner, the other end of the runner
It is connected to the runner fluid chamber；The runner is obliquely installed, and the female Luer is installed at the top of the flow path bodies and leans on
The top of the nearly runner plug, the runner fluid chamber is equipped with sealing ring, and the bottom of the runner fluid chamber is equipped with spray
Mouth positioning column, the nozzle are installed on the bottom of the nozzle positioning column by the nozzle retaining cap.
Further, the bottom of the flow path bodies is a ramped bottom surface, and the ramped bottom surface is close to the runner plug
One end be higher than close to the nozzle retaining cap one end.
Compared with prior art, the present invention beneficial effect is:
There is the upper end lever and lower end lever that can be swung up and down, body top tool inside fluid injection valve of the invention
There is adjusting screw, turns the adjusting screw, it can be up and down.Screw is adjusted while up and down, in the press of bottom
Lever is held, thus make the run-off the straight relative to horizontal direction of upper end lever, the horizontally tilted angular dimension of upper end lever, direct shadow
The angular range (being the range of the swinging end upper and lower displacement of lower end lever) of Piezoelectric Ceramic lower end lever swing is rung.Institute
With, in prolonged operation process, if lower end lever occur upper and lower displacement deviation, can be right by turning adjusting screw
The angular range of lower end lever swing is adjusted, to correct the upper and lower displacement deviation of lower end lever.As it can be seen that the present invention only needs
Turning adjusting screw can be realized quick corrective operations, and task difficulty is small.Meanwhile adjusting screw and being located at body top, week
While not having object obstruction, debugging operations are convenient and efficient.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of fluid injection valve provided in an embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention；Term " first ", " second ", " third "
It is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance；In addition, unless otherwise specific regulation and limit
Fixed, term " installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, be also possible to detachably connect
It connects, or is integrally connected；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, intermediate matchmaker can also be passed through
Jie is indirectly connected, and can be the connection inside two elements.It for the ordinary skill in the art, can be with concrete condition
Understand the concrete meaning of above-mentioned term in the present invention.
In order to allow those skilled in the art to better understand technical solution of the present invention, in the following, schematically illustrate one compared with
Good embodiment is described in detail.The fluid injection valve of the embodiment can apply to modern 3C electronics and produce, intelligent wearable device,
Pcb board encapsulation, LED encapsulate new energy, solar energy, automotive electronics, medical research, the occasions such as food filling.
Referring to Figure 1, a kind of fluid injection valve, including valve body 1, piezoelectric ceramics 2, striker 3, lower end are present embodiments provided
Lever 4, adjusts screw 6, upper end lever 7 and flow channel component at firing pin spring 5.Wherein, the flow channel component includes runner plug
81, female Luer 82, flow path bodies 83, nozzle 84 and nozzle retaining cap 85.There is runner 831, material chamber in flow path bodies 83
832 and runner fluid chamber 833.
There is cavity 11 in above-mentioned valve body 1, piezoelectric ceramics 2 is vertically arranged in cavity 11.The connecting pin of lower end lever 4 is logical
It crosses the first pin 91 to be swingably installed in cavity 11, and the connection of the bottom end of piezoelectric ceramics 2 and lower end lever 4 terminates
Touching.The piezoelectric ceramics 2 is being powered, the swinging end of the lower end lever 4 can driven to swing up and down in the continuous alternating of electric discharge, institute
The swinging end for stating lower end lever 4 is located at the top of the striker 3, can hit the striker 3.Wherein, the first pin 91 is installed
In on the wall body of valve body 1, top is protruded into cavity 11.It is understood that lower end lever 4 can pass through with the first pin 91
It is hinged and then that both realizes can swing relatively, can also by the convex-concave structure of arcuation contact with each other both realize can phase
To swing.
Above-mentioned 5 bottom end of firing pin spring is fixed in cavity 11 by positioning screw 92, and the firing pin spring 5 is sheathed on
On the upper end periphery of the striker 3, the top of striker guided missile 5 presses the head of the striker 3, passes through above structure, striker bullet
Spring 5 is folded between 3 head of striker and positioning screw 92.
Above-mentioned flow channel component is installed on the bottom of the valve body 1, and the striker 3 protrudes into material chamber 832, and runner 831 goes out
In mouth access material chamber 832；Nozzle 84 is installed on 832 lower section of material chamber by nozzle retaining cap 85.
The connecting pin of above-mentioned upper end lever 7 is swingably installed on 11 top position of cavity by the second pin 93,
The adjusting screw 6 is threadedly connected to 1 top of valve body, and the bottom end for adjusting screw 6 is protruded into the cavity 11, and energy
Press the swinging end of upper end lever 7.
Above-mentioned upper end lever 7 and the laterally setting of lower end lever 4, the connecting pin of the upper end lever 7, swinging end difference
Positioned at its left and right ends, the connecting pin of the lower end lever 4, swinging end are located at its left and right ends.The piezoelectric ceramics 2 is whole
Body is in the form of a column, and top corresponds to the lower section of 7 connecting pin of upper end lever, and bottom end corresponds to 4 connecting pin of lower end lever
Top.Upper end lever 7, piezoelectric ceramics 2 and lower end lever 4 collectively form half of rectangle frame.
Further, the bottom of the connecting pin of upper end lever 7 is equipped with the first arcuation concave surface, the top of the piezoelectric ceramics 2
With the first arcuation protrusion, the first arcuation protrusion is embedded in just in first arcuation concave surface.The company of the upper end lever 7
The top for connecing end is equipped with the second arcuation concave surface, and the bottom of second pin 93 is embedded in just in second arcuation concave surface.Institute
The top for stating the connecting pin of lower end lever 4 is equipped with the second arcuation protrusion, and the bottom end of the piezoelectric ceramics 2 has third arcuation recessed
Face, the second arcuation protrusion are embedded in just in third arcuation concave surface.The bottom of the connecting pin of the lower end lever 4 is equipped with
4th arcuation concave surface, the top of first pin 91 are embedded in just in the 4th arcuation concave surface.Pass through the convex of above-mentioned arcuation
Recessed structure design, so that upper end lever 7, lower end lever 4 are more smooth during the swing, the angle continuity of swing is more preferable.
Above-mentioned runner plug 81 blocks one end of the runner 831, the other end of the runner 831 and the runner liquid
Chamber 833 is connected to.The runner 831 is obliquely installed, and the female Luer 82 is installed on 83 top of flow path bodies and close to institute
Runner plug 81 is stated, the top of the runner fluid chamber 833 is equipped with sealing ring 86, and the bottom of the runner fluid chamber 833 is pacified
Equipped with nozzle positioning column 87, the nozzle 84 is installed on the bottom of the nozzle positioning column 87 by the nozzle retaining cap 85.
The bottom of the flow path bodies 83 is a ramped bottom surface, and the ramped bottom surface is higher than close close to one end of the runner plug 81
One end of the nozzle retaining cap 85.Runner 831 is obliquely installed, and reduces lateral occupied space, and female Luer 82 is installed on stream
831 top of road main body and close runner plug 81；It is stifled far from runner that the components such as nozzle retaining cap 85, nozzle 84 are located at runner 831
First 81 one end, so that entire flow channel for liquids component is in I shape, it is compact-sized, it occupies little space when installing and using.
The course of work of the injection valve of the present embodiment is as follows: the swinging end of lower end lever 4 is driven when piezoelectric ceramics 2 discharges
Upwards, firing pin spring 5 is elongated, and striker 3 is pushed to move up, and striker 3 and nozzle 84 are contactless at this time, and nozzle 84 is opened, fluid
Mass flowing nozzle 84.When piezoelectric ceramics 2 is powered, the swinging end of driving lower end lever 4 is moved down, and the compression of firing pin spring 5 makes to hit
Needle 3 moves down, while striker 3 is contacted with nozzle 84, forms closed state, fluid is unable to mass flowing nozzle 84 at this time.Pass through pressure
The continuous energization and electric discharge of electroceramics 2, make lower end lever 4 pump, while driving striker 4 and nozzle 84 continuous
Folding.
As it can be seen that there is the upper end lever 7 and lower end lever 4 that can be swung up and down inside the fluid injection valve of the present embodiment,
Have at the top of valve body 1 and adjust screw 6, turns the adjusting screw 6, it can be up and down.Screw 6 is adjusted up and down same
When, bottom presses upper end lever 7, to make the run-off the straight relative to horizontal direction of upper end lever 7, lever 7 level in upper end is inclined
Oblique angular dimension, directly affecting the angular range that piezoelectric ceramics 2 drives lower end lever 4 to swing (is the pendulum of lower end lever 4
The range of moved end upper and lower displacement).It, can be with if lower end lever 4 is subjected to displacement deviation so in prolonged operation process
By adjusting screw 6, the angular range swung to lower end lever 4 is adjusted, to correct the upper bottom of lower end lever 4
Move deviation.As it can be seen that the present embodiment, which only needs to turn adjusting screw 6, can be realized quick corrective operations, task difficulty is small.Together
When, it adjusts screw 6 and is located at 1 top of valve body, periphery does not have object to hinder debugging operations convenient and efficient.
Further, it adjusts and is provided with the length scale being spaced apart in the vertical direction on the periphery of screw 6, thus real
It now quantitatively adjusts, clearly can effectively know the parameter setting of its debugging process, reduce the abnormal problem in production process.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (7)
1. a kind of fluid injection valve, including valve body, piezoelectric ceramics, striker, lower end lever, firing pin spring and flow channel component, institute
Stating flow channel component includes runner, material chamber, nozzle and nozzle retaining cap, has cavity in the valve body, the piezoelectric ceramics is perpendicular
In the cavity to setting；The connecting pin of the lower end lever is swingably installed in the cavity by the first pin,
And the connection end in contact of the bottom end of the piezoelectric ceramics and the lower end lever, the piezoelectric ceramic energy drive the lower end thick stick
The swinging end of bar is swung up and down, and the swinging end of the lower end lever is located at the top of the striker, can hit the striker；Institute
It is fixed in the cavity by positioning screw to state firing pin spring bottom end, and the firing pin spring is sheathed on the upper of the striker
It holds on periphery, the top of the striker guided missile presses the head of the striker；The flow channel component is installed on the bottom of the valve body
Portion, the striker protrude into that the material is intracavitary, and it is intracavitary that the outlet of the runner accesses the material；The nozzle is solid by the nozzle
Determine cap to be installed below the material chamber；It is characterized in that, the fluid injection valve further includes adjusting screw and upper end lever, institute
The connecting pin for stating upper end lever is swingably installed on the cavity top position, the adjusting screw thread by the second pin
It is connected to the body top, the bottom end for adjusting screw is protruded into the cavity, and can press the pendulum of the upper end lever
Moved end.
2. fluid injection valve as described in claim 1, which is characterized in that the upper end lever and lower end lever are laterally set
It sets, the connecting pin of the upper end lever, swinging end are located at its left and right ends, the connecting pin of the lower end lever, swinging end
It is located at its left and right ends；The piezoelectric ceramics is integrally in the form of a column, and top corresponds to the lower section of upper end lever connecting pin,
Its bottom end corresponds to the top of lower end lever connecting pin.
3. fluid injection valve as claimed in claim 2, which is characterized in that the bottom of the connecting pin of the upper end lever is equipped with the
One arcuation concave surface, the top of the piezoelectric ceramics have the first arcuation protrusion, and the first arcuation protrusion is embedded in described the just
In one arcuation concave surface；The top of the connecting pin of the upper end lever is equipped with the second arcuation concave surface, and the bottom of second pin is proper
It is embedded in well in second arcuation concave surface.
4. fluid injection valve as claimed in claim 2 or claim 3, which is characterized in that set at the top of the connecting pin of the lower end lever
There is the second arcuation protrusion, the bottom end of the piezoelectric ceramics has third arcuation concave surface, and the second arcuation protrusion is embedded in institute just
It states in third arcuation concave surface；The bottom of the connecting pin of the lower end lever is equipped with the 4th arcuation concave surface, the top of first pin
Portion is embedded in just in the 4th arcuation concave surface.
5. fluid injection valve as described in claim 1, which is characterized in that be provided on the periphery for adjusting screw vertical
The length scale being spaced apart on direction.
6. fluid injection valve as described in claim 1, which is characterized in that the flow channel component further includes female Luer, runner
Main body, runner plug and runner fluid chamber, the runner are set in the flow path bodies, described in the runner plug closure
One end of runner, the other end of the runner are connected to the runner fluid chamber；The runner is obliquely installed, the female Luer
It is installed at the top of the flow path bodies and the close runner plug, the top of the runner fluid chamber is equipped with sealing ring, institute
The bottom for stating runner fluid chamber is equipped with nozzle positioning column, and the nozzle, which is installed on the nozzle by the nozzle retaining cap, to be determined
The bottom of position column.
7. fluid injection valve as claimed in claim 6, which is characterized in that the bottom of the flow path bodies is a ramped bottom surface,
The ramped bottom surface is higher than close to one end of the runner plug close to one end of the nozzle retaining cap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811421744.5A CN109433505A (en) | 2018-11-26 | 2018-11-26 | A kind of fluid injection valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811421744.5A CN109433505A (en) | 2018-11-26 | 2018-11-26 | A kind of fluid injection valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109433505A true CN109433505A (en) | 2019-03-08 |
Family
ID=65554639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811421744.5A Pending CN109433505A (en) | 2018-11-26 | 2018-11-26 | A kind of fluid injection valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109433505A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110252603A (en) * | 2019-07-22 | 2019-09-20 | 常州高凯精密技术股份有限公司 | Dispenser, piezo jet valve and its Quick-attachable flow passage device |
| CN110548649A (en) * | 2019-09-24 | 2019-12-10 | 常州高凯精密技术股份有限公司 | Device for correcting pretightening force between firing pin and nozzle and piezoelectric injection valve thereof |
| CN110947579A (en) * | 2019-11-20 | 2020-04-03 | 深圳市新迈自动化科技有限公司 | Piezoelectric injection valve |
| CN114226175A (en) * | 2022-02-21 | 2022-03-25 | 常州铭赛机器人科技股份有限公司 | Piezoelectric valve pre-tightening adjusting mechanism |
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2018
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110252603A (en) * | 2019-07-22 | 2019-09-20 | 常州高凯精密技术股份有限公司 | Dispenser, piezo jet valve and its Quick-attachable flow passage device |
| CN110548649A (en) * | 2019-09-24 | 2019-12-10 | 常州高凯精密技术股份有限公司 | Device for correcting pretightening force between firing pin and nozzle and piezoelectric injection valve thereof |
| CN110947579A (en) * | 2019-11-20 | 2020-04-03 | 深圳市新迈自动化科技有限公司 | Piezoelectric injection valve |
| CN114226175A (en) * | 2022-02-21 | 2022-03-25 | 常州铭赛机器人科技股份有限公司 | Piezoelectric valve pre-tightening adjusting mechanism |
| CN114226175B (en) * | 2022-02-21 | 2022-05-17 | 常州铭赛机器人科技股份有限公司 | Piezoelectric valve pre-tightening adjusting mechanism |
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