CN208719091U - Press fitting device - Google Patents
Press fitting device Download PDFInfo
- Publication number
- CN208719091U CN208719091U CN201820767295.9U CN201820767295U CN208719091U CN 208719091 U CN208719091 U CN 208719091U CN 201820767295 U CN201820767295 U CN 201820767295U CN 208719091 U CN208719091 U CN 208719091U
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- Prior art keywords
- pressing
- power unit
- frame platform
- pressure sensor
- pressing device
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- Expired - Fee Related
Links
- 238000003825 pressing Methods 0.000 claims abstract description 119
- 230000033001 locomotion Effects 0.000 claims description 30
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000000741 silica gel Substances 0.000 claims description 5
- 229910002027 silica gel Inorganic materials 0.000 claims description 5
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 206010044565 Tremor Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Landscapes
- Automatic Assembly (AREA)
Abstract
本公开提供一种压合装置，其结构包含：框架平台，具有承载面；动力单元，设置于框架平台，具有一推抵端；压合组件，设置于框架平台，且与动力单元连接。其中压合组件包括：压块载板，架构于框架平台上，以相对于框架平台纵向滑动，且具有彼此相对的压合面与抵顶面，其中压合面面向承载面；压力传感器，设置于压块载板的抵顶面上；弹性件，其一端连接至压力传感器，另一端连接至动力单元的推抵端，其中当弹性件受动力单元的推抵端的推抵，对应产生一弹性力以作为压合力，且压力传感器组配量测弹性力；导轨单元，设置于压块载板的抵顶面上；限位单元，邻设于导轨单元，且连接于动力单元的推抵端。
The present disclosure provides a pressing device, the structure of which includes: a frame platform having a bearing surface; a power unit, which is arranged on the frame platform and has a push-up end; a pressing assembly, which is arranged on the frame platform and connected to the power unit. The pressing assembly includes: a pressure block carrier, which is constructed on the frame platform to slide longitudinally relative to the frame platform, and has a pressing surface and a push-up surface opposite to each other, wherein the pressing surface faces the bearing surface; a pressure sensor, which is arranged on the push-up surface of the pressure block carrier; an elastic member, one end of which is connected to the pressure sensor and the other end is connected to the push-up end of the power unit, wherein when the elastic member is pushed by the push-up end of the power unit, an elastic force is generated correspondingly as a pressing force, and the pressure sensor assembly measures the elastic force; a guide rail unit, which is arranged on the push-up surface of the pressure block carrier; a limit unit, which is adjacent to the guide rail unit and connected to the push-up end of the power unit.
Description
Technical field
This disclosure relates to a kind of pressing device, in particular to a kind of stable type pressing device.
Background technique
In electronic device assembling field, the combination of each inter-module need to often be carried out by way of pressing.With display screen
For the combination of face and center or rear shell, gum is activated by the pressure effect on display face surface, to make display
It can closely be combined with center or rear shell.Existing pressing device is the utilization flexible glue material singly deposited as pressure head part, is being carried out
In the bonding processes of display assembling, the deformation of flexible glue material easily influences the pressure value that senses of pressure sensor, makes to measure
Pressure value changes greatly, and causes the pressure value for being effectively outputed to display product surface unstable, and then lead to display face
The risk that generates rupture or can not combine closely because gum activation is incomplete.On the other hand, the pressure that general pressing device uses
Close smelting tool also may be such that display product generates during the pressing process because the air pressure used is unstable, the output of electric cylinders is unstable
The uneven and unstable problem of pressure, and then cause the internal crack phenomenon of display face or ram travel overload that pressure is caused to pass
The problems such as sensor damages.Furthermore for the display product that can not effectively combine, dropped in test in subsequent, it will be further
It leads to the problem of, so that the product in volume production stage is not gone again and process and need to scrap.
In view of this, the stability to pressure output is realized it is really necessary to provide a kind of stable type pressing device in this field
The protection of device is passed, with pressure to solve the problems, such as that the prior art is insurmountable.
Summary of the invention
The disclosure is designed to provide a kind of stable type pressing device.Using electric cylinders it is the output device of power, and uses
Linear guides, spring and limited block realize the stability to pressure output and the protection to pressure sensor.Wherein electric cylinders
Output can accurate control movement travel；Linear guides make the pressure head of pressing device will not be because when bearing very big output pressure force
For framework platform is unstable and causes to deviate.In addition, to pressure head reaction force during the motion and passing through control using spring
Feedback of the system processed to servo motor, it can be ensured that pressure passes the pressure value that device senses and stablizes, and makes pressure force in small range
Interior variation, meets application demand.Furthermore increased limited block is adjustably controlled the move distance of spring on linear guides, it is ensured that
Will not overload because of the movement travel of pressure head causes pressure sensor to damage.Therefore disclosure stable type pressing device can be prevented effectively
General tool for stitching causes the generation implosion of the product such as display face existing since air pressure is unstable, the output of electric cylinders is unstable
As, and avoid the problem that causing pressure sensor to damage because ram travel is overloaded.
The another object of the disclosure is to provide a kind of stable type pressing device.Mechanism is exported by steady pressure, to example
Such as display face generation uniformly applies pressure, it is ensured that product will not be during pressing because of pressing unbalance stress or shakiness
It is fixed and effectively can not fit closely or be deformed, phenomena such as display screen implosion, component fall off.
For up to foregoing purpose, the disclosure provides a kind of stable type pressing device then, to apply a pressure force to an object.
Pressing device includes framework platform, power unit and pressing assembly.Framework platform has a loading end, to assemble and carrier
Part.Power unit is set to framework platform, has a pushing and pressing end.Pressing assembly is set to framework platform, and connects with power unit
It connects, with framework relative to framework platform longitudinal sliding motion, and applies pressure force in the object on loading end.Wherein pressing assembly includes
Briquetting support plate, pressure sensor, elastic component, rail unit and position-limiting unit.Briquetting support plate framework is in framework platform, with opposite
In framework platform longitudinal sliding motion, and there is a stitching surface and a support surface relative to each other, wherein stitching surface is towards loading end.Pressure
Force snesor is set on the support surface of briquetting support plate.One end of elastic component is connected to pressure sensor, and the other end is connected to dynamic
The pushing and pressing end of power unit, wherein when elastic component is pushed against by power unit the pushing and pressing at end, it is corresponding generate an elastic force using as this
Pressure force, and pressure sensor assembles measurement elastic force.Rail unit is set on the support surface of briquetting support plate, is led with assembling
The pushing and pressing end for drawing power unit acts on the direction of pressure sensor through elastic component.Position-limiting unit is adjacent to rail unit, and
It is connected to the pushing and pressing end of power unit, to assemble the elastic force that limitation elastic component acts on pressure sensor.
In an embodiment, position-limiting unit includes limit top, limit bottom and limited block.Limit top and limit
Bottom is relative to each other.Limited block is placed between limit top and limit bottom, and is connected to the pushing and pressing end of power unit, in dynamic
When the pushing and pressing end of power unit is guided by rail unit, the movement travel of limitation pushing and pressing end longitudinal sliding motion, to assemble limitation elastic component
Act on the elastic force of pressure sensor.
In an embodiment, briquetting support plate includes a pressure head, is detachably set to the bottom surface of briquetting support plate, and the pressure head has
There is a layer of silica gel, with framework stitching surface.
In an embodiment, elastic component is a spring.
In an embodiment, power unit includes an electric cylinders and a slide link, and slide link is connected to electric cylinders, and slides
One end of connecting rod, which assembles, generates the movement travel of longitudinal sliding motion when slide link is tended to act by electric cylinders for pushing and pressing end.
In an embodiment, pressing device also includes a controller, is connected to power unit and pressure sensor.
In an embodiment, framework platform includes a bottom plate, a top plate and multiple pedestals, bottom plate and top plate phase each other
It is right, and connected by multiple pedestals, wherein power unit is set to top plate, and loading end is set to bottom plate.
In an embodiment, framework platform includes a bearing seat, bottom plate is set to, with framework loading end.
In an embodiment, pressing assembly includes multiple external members, is set to the periphery of briquetting support plate, and opposite set is set to
On multiple pedestals of framework platform, make briquetting support plate framework on framework platform, and relative to framework platform longitudinal sliding motion.
Detailed description of the invention
Fig. 1 is the three-dimensional structure diagram for the pressing device that the open disclosure is preferably implemented.
Fig. 2 is the structural exploded view for the pressing device that the open disclosure is preferably implemented.
Fig. 3 to Fig. 6 is the section knot for disclosing the pressing device of disclosure preferred embodiment respectively in different operation program
Structure schematic diagram.
Description of symbols:
1: pressing device
10: framework platform
11: loading end
12: bottom plate
13: top plate
14: pedestal
15: bearing seat
20: power unit
21: pushing and pressing end
22: electric cylinders
23: slide link
30: pressing assembly
31: briquetting support plate
311: stitching surface
312: support surface
313: pressure head
314: layer of silica gel
315: external member
32: pressure sensor
34: rail unit
33: elastic component
35: position-limiting unit
351: limit top
352: limit bottom
353: limited block
9: object
Specific embodiment
The some exemplary embodiments for embodying disclosure features and advantages will describe in detail in the explanation of back segment.It should be understood that
It is that the disclosure there can be various variations in different embodiments, does not all depart from the scope of the present disclosure, and therein
Illustrate and illustrate inherently to be illustrated as being used, not for the limitation disclosure.
Fig. 1 is the three-dimensional structure diagram for the pressing device that the open disclosure is preferably implemented.Fig. 2 is that the open disclosure is preferably implemented
Pressing device structural exploded view.As shown, pressing device 1, to being for example but not limited to a PC or PAD display screen
The objects 9 such as component (including gum) apply a pressure force, to complete pressing assembling operation.The structure of pressing device 1 includes frame
Platform 10, power unit 20 and pressing assembly 30.Framework platform 10 has a loading end 11, is intended to apply pressing to assemble carrying
The object 9 of power.In this present embodiment, framework platform 10 also includes a bottom plate 12, a top plate 13 and multiple pedestals 14, bottom plate 12
Opposite to each other with top plate 13, and by multiple pedestals 14 it connects, wherein power unit 20 is set to top plate 13, and loading end 11 is set
It is placed in bottom plate 12.In this present embodiment, framework platform 10 includes also a bearing seat 15, bottom plate 12 is set to, with framework loading end
11.Wherein bearing seat 15 is a removable bearing seat, can be changed in response to practical application request, to assemble the different loading end of framework
11, so that pressing device 1 is can be used to press various different object 9, and the essential features of its unrestricted disclosure, no longer in this
It repeats.
In addition, the power unit 20 of the disclosure is set on the top plate 13 of e.g. framework platform 10, and there are a pushing and pressing
End 21.In this present embodiment, power unit 20 further includes an electric cylinders 22 and a slide link 23, and slide link 23 is connected to electric cylinders
22, and one end of slide link 23 assembles to push against end 21, when tending to act, is generated longitudinal sliding in slide link 23 by electric cylinders 22
Dynamic movement travel.Significantly, since the slide link 23 of power unit 20 is tended to act by electric cylinders 22, therefore push against end 21
The movement travel of longitudinal sliding motion can be controlled accurately.
Furthermore the pressing assembly 30 of the disclosure is set on framework platform 10, and is connect with power unit 20, with framework
Relative to 10 longitudinal sliding motion of framework platform, and apply pressure force in the object 9 on loading end 11.In this present embodiment, pressing group
Part 30 includes briquetting support plate 31, pressure sensor 32, elastic component 33, rail unit 34 and position-limiting unit 35.Briquetting support plate 31
Framework is on framework platform 10, with relative to 10 longitudinal sliding motion of framework platform, and have a stitching surface 311 relative to each other with
One support surface 312, wherein stitching surface 311 is towards loading end 11.In this present embodiment, pressing assembly 30 also includes multiple external members
315, it is set to the periphery of briquetting support plate 31, and opposite set is set on multiple pedestals 14 of framework platform 10, makes briquetting support plate
31 structures are on framework platform 10, and relative to 10 longitudinal sliding motion of framework platform.In this present embodiment, the top surface frame of briquetting support plate 31
Structure is support surface 312, in addition, briquetting support plate 31 also includes a pressure head 313, opposite support surface 312 is detachably set to briquetting load
The bottom surface of plate 31, and pressure head 313 to form aforementioned pressing assembly 30 with more the structure that one is, for example, layer of silica gel 314 to assemble
Stitching surface 311.Similar to the aforementioned tool removable bearing seat 15 of loading end 11, the pressure head 313 in pressing assembly 30 may also respond with
Practical application request changes, and to assemble the different stitching surface 311 of framework, pressing device 1 is made to can be used to press various different objects
9, and the essential features of its unrestricted disclosure, it is repeated no more in this.
On the other hand, in pressing assembly 30, pressure sensor 32 is set on the support surface 312 of briquetting support plate 31.Its
One end of middle elastic component 33 is connected to pressure sensor 32, and the other end is then connected to the pushing and pressing end 21 of power unit 20.Yu Benshi
Apply in example, elastic component 33 be, for example, a spring, both ends be detachably socketed on respectively pushing and pressing end 21 with it is convex on pressure sensor 32
Portion or tube-in-tube structure.Wherein elastic component 33 by the pushing and pressing end 21 of power unit 20 pushing and pressing, it is corresponding generate an elastic force using as
Pressure force, and pressure sensor 32 assembles and measures the elastic force, i.e. pressure force.It is emphasized that the pressure of disclosure pressing device 1
First 313 when it presses and acts on object 9 in motion process on stitching surface 311 pressure force, while on support surface 312
Reaction force acts are in the elastic component 33 of e.g. spring, so the pressure force that pressing assembly 30 provides is equal to pressure sensor
32 elastic forces measured can be, for example, controller or control system between power unit 20 and pressure sensor 32 by being connected to
Feeding back to servo motor and controlling for measuring value is provided, it is ensured that the pressure force numerical stability that pressure sensor 32 measures, and make
Pressure force changes in small range, meets practical application request.
In this present embodiment, rail unit 34 is set on the support surface 312 of briquetting support plate 31, to assemble guiding power list
The pushing and pressing end 21 of member 20 acts on the direction of pressure sensor 32 through elastic component 33.Since the pushing and pressing end 21 of power unit 20 exists
Using linear rail unit 34 as guiding when longitudinal sliding motion, power output passes through elastic component 33, pressure sensor 32 and pressure
The stitching surface 311 of block support plate 31 to pressure head 313 is applied to object 9, even if pressure head 313 under conditions of bearing very big power output,
It will not lead to offset problem because framework platform 10 is unstable.In addition, the position-limiting unit 35 in pressing assembly 30 is more adjacent to
Rail unit 34, and it is connected to the pushing and pressing end 21 of power unit 20, pressure sensor 32 is acted on to assemble limitation elastic component 33
Elastic force.In this present embodiment, position-limiting unit 35 can be for example comprising limit top 351, limit bottom 352 and limited block
353.Limit bottom 352 and limit top 351 opposite to each other.Limited block 353 is for example placed in limit top 351 and limit bottom
Between portion 352, and it is connected to the pushing and pressing end 21 of power unit 20, is guided in the pushing and pressing end 21 of power unit 20 by rail unit 34
When, the movement travel of limitation pushing and pressing 21 longitudinal sliding motion of end, to assemble the elasticity that limitation elastic component 33 acts on pressure sensor 32
Power, it is ensured that elastic component 33 will not cause pressure sensor 32 to damage because the movement travel of pressing assembly 30 is overloaded.It is worth note
Meaning, in previous embodiment, the size and respective distances at limit top 351, limit bottom 352 and limited block 353 are equal
Visual actual demand and modulation.By elastic component 33 be one have spring constant for the spring of K for, when limited block 353 supports limit
When position top 351, the spring deformation amount of elastic component 33 is X1, provides pressure force F1=KX1；And when limited block 353 supports limit
When bottom 352, the spring deformation amount of elastic component is X2, provides pressure force F2=KX2, X1 < X2.The then pressure that pressing assembly 30 provides
With joint efforts, i.e. the elastic force range of the measurement of pressure sensor 32 is between F1=KX1 and F2=KX2.When elastic component 33 replaces with other
When spring with different spring constants, the pressure force range that pressing assembly 30 provides also will be with respect to modulation.In addition, it should be highlighted that
It is the visual practical application request of form, quantity and installation position of rail unit 34 and position-limiting unit 35 and modulation, just in this
It repeats no more.
Fig. 3 to Fig. 6 is the section knot for disclosing the pressing device of disclosure preferred embodiment respectively in different operation program
Structure schematic diagram.Firstly, as shown in figure 3, in disclosure pressing device 1 to being for example but not limited to a PC or PAD display screen
Before the objects 9 such as component (including gum) carry out bonding operation, loading end that the stitching surface 311 of pressing assembly 30 becomes from bearing seat 15
11, to form enough operating spaces in stitching surface 311 and loading end 11, makes object 9 that can be loaded into bearing seat 15 and be placed in carrying
On face 11.Then, when object 9 is loaded into bearing seat 15 and being placed on loading end 11 and starts to carry out bonding operation, power unit 20
23 longitudinal sliding motion of slide link of tending to act of electric cylinders 22 it is downward, so that the stitching surface 311 of pressing assembly 30 is fitted in the surface of object 9,
As shown in Figure 4.At this point, limited block 353 supports limit top 351, stitching surface 311 starts to force in the surface of object 9, in tool bullet
When the elastic component 33 that spring coefficient is K starts to generate deformation effect from spring deformation amount X1, the elastic force of pressure force and elastic component 33
Change by F1=KX1.It is worth noting that, the pushing and pressing end of the starting drive slide link 23 of electric cylinders 22 in power unit 20
When 21 longitudinal sliding motions start downwards the surface of contact subject 9, since the layer of silica gel 314 of 313 part of pressure head is easy to produce because of stress
Raw deformation, the actual pressure value for causing pressure sensor 32 to measure constantly change.At this point, the control of the pressing device 1 of the disclosure
The feedback that device (not shown) can obtain pressure decline according to pressure sensor 32 causes the electric cylinders 22 of power unit 20 to drive sliding
Connecting rod 23 adjusts the movement travel of support end 21, and then adjusts pressure value, its stabilization is made to tend to setting value, up to pressure force and in advance
First setting value is equal, as shown in Figure 5.In pressing program, the continuous action under the pressure value of setting of pressing device 1 presses object
Part 9.When being, for example, the object 9 of display screen component such as pressing, pressure force is controlled in 200kgf, and pressing time is then controlled at 30 seconds extremely
Between 60 move, is then changed by the pressure force of Fig. 4 to Fig. 5, taken about 2 seconds by 0kgf to 200kgf, be stable at 200kgf to pressure value
Persistently pressing 30 moves to 60 seconds again afterwards.After bonding operation to be done, the electric cylinders 22 of power unit 20 drive pushing away for slide link 23
It is upwardly separated from the surface of object 9 to 21 longitudinal sliding motions of end, resets pressing assembly 30, as shown in Figure 6.Object 9 after then pressing
It can be unloaded from the loading end 11 on bearing seat 15.It is worth noting that, the position-limiting unit 35 of disclosure pressing device 1 in addition to
With more limit bottom 352, when limited block 353 supports limit bottom 352, the spring deformation of elastic component outside limit top 351
Amount is X2, provides pressure force F2=KX2, wherein X1 < X2.When carrying out the bonding operation of object 9, preset pressure value is then
Can be due between F1=KX1 and F2=KX2, pressure force controllable whereby changes in small range, and position-limiting unit 35 more limits
Elastic component 33 acts on the elastic force range of pressure sensor 32, realizes the stability export to pressure force and to pressure sensing
The protection of device.
In conclusion the disclosure provides a kind of stable type pressing device.Using electric cylinders it is the output device of power, and uses line
Property guide rail, spring and limited block realizes the stability to pressure output and the protection to pressure sensor.Wherein electric cylinders are defeated
It out can accurate control movement travel；Linear guides make the pressure head of pressing device will not be because of when bearing very big output pressure force
Framework platform is unstable and causes to deviate.In addition, to pressure head reaction force during the motion and passing through control using spring
Feedback of the system to servo motor, it can be ensured that pressure passes the pressure value that device senses and stablizes, and makes pressure force in small range
Variation, meets application demand.Furthermore increased limited block is adjustably controlled the move distance of spring on linear guides, it is ensured that no
Pressure sensor can be caused to damage because of the movement travel overload of pressure head.Therefore disclosure stable type pressing device can effectively prevent one
As tool for stitching since air pressure is unstable, unstable to cause the product such as display face to generate implosion existing for the output of electric cylinders
As, and avoid the problem that causing pressure sensor to damage because ram travel is overloaded.In addition, mechanism is exported by steady pressure,
Pressure is uniformly applied to generations such as such as display faces, it is ensured that product will not during pressing because pressing unbalance stress or
It is unstable and effectively can not fit closely or be deformed, phenomena such as display screen implosion, component fall off.
Present disclosure can be carry out various modifications by those skilled in the art, claimed without departing from claims
Range.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820767295.9U CN208719091U (en) | 2018-05-22 | 2018-05-22 | Press fitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820767295.9U CN208719091U (en) | 2018-05-22 | 2018-05-22 | Press fitting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208719091U true CN208719091U (en) | 2019-04-09 |
Family
ID=65970660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820767295.9U Expired - Fee Related CN208719091U (en) | 2018-05-22 | 2018-05-22 | Press fitting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208719091U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111503105A (en) * | 2020-04-27 | 2020-08-07 | 格润智能装备(深圳)有限公司 | Multi-interface chip soldering tin gum device and method |
| CN114678291A (en) * | 2020-12-25 | 2022-06-28 | 万润科技股份有限公司 | Pressing equipment, upper mold control method, upper mold device |
| CN119053230A (en) * | 2024-10-28 | 2024-11-29 | 上海隐冠半导体技术有限公司 | Automatic pressurizing and glue discharging equipment for piezoelectric ceramic stack and pressurizing method thereof |
-
2018
- 2018-05-22 CN CN201820767295.9U patent/CN208719091U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111503105A (en) * | 2020-04-27 | 2020-08-07 | 格润智能装备(深圳)有限公司 | Multi-interface chip soldering tin gum device and method |
| CN114678291A (en) * | 2020-12-25 | 2022-06-28 | 万润科技股份有限公司 | Pressing equipment, upper mold control method, upper mold device |
| CN119053230A (en) * | 2024-10-28 | 2024-11-29 | 上海隐冠半导体技术有限公司 | Automatic pressurizing and glue discharging equipment for piezoelectric ceramic stack and pressurizing method thereof |
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Granted publication date: 20190409 |