CN111238691A - High-precision force sensor - Google Patents
High-precision force sensor Download PDFInfo
- Publication number
- CN111238691A CN111238691A CN202010157058.2A CN202010157058A CN111238691A CN 111238691 A CN111238691 A CN 111238691A CN 202010157058 A CN202010157058 A CN 202010157058A CN 111238691 A CN111238691 A CN 111238691A
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- wall
- sensor body
- force sensor
- high accuracy
- plate
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M13/00—Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles
- F16M13/02—Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles for supporting on, or attaching to, an object, e.g. tree, gate, window-frame, cycle
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a high-precision force sensor, which comprises a sensor body, wherein the top of the sensor body is provided with an integrally formed wiring end, an induction terminal is arranged in the middle of the top of the wiring end, the bottom of the sensor body is provided with an adapter, the front side of the outer wall of the adapter is provided with an adapter, a data wire is arranged on the adapter, the middle of the outer wall of the sensor body is provided with an annular groove, a fixing device is sleeved on the annular groove, the outer wall of the wiring end is sleeved with a movable bottom plate, a top plate is arranged above the induction terminal, a dustproof film is bonded on the outer side between the outer edge of the movable bottom plate and the outer edge of the top plate, a telescopic core is connected between the movable bottom plate and the top plate, a through hole matched with the induction terminal is formed in the middle of the top, the fixed point when having increased the installation of sensor body, the steadiness is good for signal transmission's steady orientation and accuracy are higher.
Description
Technical Field
The invention belongs to the technical field of sensors, and particularly relates to a high-precision force sensor.
Background
A force sensor is a device or apparatus that senses a pressure signal and converts the pressure signal into a usable output electrical signal according to a certain rule. The pressure sensor is the most common sensor in industrial practice, is widely applied to various industrial automatic control environments, and relates to a plurality of industries such as water conservancy and hydropower, railway traffic, intelligent buildings, production automatic control, aerospace, military industry, petrochemical industry, oil wells, electric power, ships, machine tools, pipelines and the like.
In the prior art, the miniature sensor is small, the miniature sensor is easy to install, and due to the restriction of conditions such as the internal space of the sensor, the installation space of a user and the like, parts with protective effects such as an outlet clamping joint, a waterproof joint, a rubber bushing and the like cannot be used at the outlet part of the cable. And the mode of fixing the cable by completely depending on the position of the outgoing line of the glue injection filling sensor is known at present, because the filling glue is usually only attached to 1-2 surfaces of the sensor body, the adhesive force is small, and in a vibration environment, the force sensor is easy to loosen or fall off, so that the accuracy and stability of signal output are influenced, and the using effect is influenced. In addition, the existing force sensor is often exposed in the environment, impurities such as dust in the environment easily enter the sensor shell, and the impurities are attached to the inside of the sensor shell to cause damage or failure of precision components in the sensor shell and influence the normal work of the sensor.
Disclosure of Invention
Aiming at the problems, the invention provides a high-precision force sensor which has good stability, so that the signal transmission is stable and accurate, and the precision is high.
In order to achieve the purpose, the invention adopts the technical scheme that: a high-precision force sensor comprises a sensor body, wherein the top of the sensor body is provided with an integrally formed wiring terminal, an octagonal nut is arranged on the outer wall of the top of the wiring end, an induction terminal is arranged in the middle of the top of the wiring end, the bottom of the sensor body is provided with an adapter, the front side of the outer wall of the adapter is provided with an adapter, the adapter is provided with a data wire, the middle of the outer wall of the sensor body is provided with an annular groove, the annular groove is sleeved with a fixing device, the outer wall of the wiring end is sleeved with a movable bottom plate, a top plate is arranged above the induction terminal, a dustproof film is bonded on the outer side between the outer edge of the movable bottom plate and the outer edge of the top plate, a telescopic core is connected between the movable bottom plate and the top plate, the middle of the top plate is provided with a through hole matched with the induction terminal, and the top plate is provided with a rotating handle matched with the through hole.
As a further improvement of the above technical solution: fixing device is including cup jointing the snap ring of ring channel outer wall, the breach has been seted up on the snap ring, snap ring outer wall both sides all outwards extend and are provided with the fixed plate, two the fixed plate is located same straight line, one side two locating holes have all been seted up on the fixed plate, the fixed plate with spring one is all installed to the one end that the breach direction is unanimous.
As a further improvement of the above technical solution: the telescopic core is provided with six groups, six groups the telescopic core is followed the circumference of the concentric circles of through-hole distributes, the telescopic core is including connecting the outer tube at activity bottom plate top, the inside slidable mounting in outer tube top has the inner tube, the inner tube top extends to the outer tube outside and is fixed in the roof bottom, the outer tube with spring two has been cup jointed jointly to the inner tube outer wall.
As a further improvement of the above technical solution: the inside fan-shaped groove that is provided with of roof, it extends to rotate the handle bottom the inside fixedly connected with connection handle of fan-shaped groove, it installs in fan-shaped inslot wall bottom to rotate handle bottom rotation, the activity gasket is installed to the connection handle other end, activity gasket diameter is greater than the diameter of through-hole.
As a further improvement of the above technical solution: the fan-shaped groove is fan-shaped, the radius of the fan-shaped groove is larger than the sum of the lengths of the connecting handle and the movable sealing sheet, and the central angle of the fan-shaped groove is 120 degrees.
As a further improvement of the above technical solution: the middle of the movable bottom plate is provided with a round hole matched with the outer diameter of the wiring end, and the maximum height of the telescopic core is equal to the sum of the heights of the octagonal nut and the induction terminal.
As a further improvement of the above technical solution: the clamping ring is made of brass, the inner wall of the clamping ring is adhered with a rubber pad, and anti-skid lines are uniformly engraved on the inner wall of the rubber pad.
As a further improvement of the above technical solution: the number of the first springs is four, and the axes of the first springs are collinear with the circle centers of the positioning holes respectively.
Compared with the prior art, the invention has the advantages that:
1. the fixing plate is well installed by clamping the clamping ring on the outer wall of the annular groove, sequentially penetrating the screw rod through the positioning hole and the first spring and then connecting the screw rod with the outside, so that a fixing point of the sensor body during installation is increased, the stability is good, the other end of the first spring abuts against an external installation point during installation, the first spring contracts under stress, after the fixing device is well installed, the restoring force of the first spring enables the screw rod to be difficult to slide, in addition, the sensor body and the external installation point are in elastic contact, the damping effect is good, and the stability and the accuracy of signal transmission are higher;
2. can be at the inside movable sealing piece that removes of sector groove through the setting, under the general condition, live the through-hole with movable sealing piece seal, it is dustproof effectual, when needs insert the outside port with the response terminal, rotate the rotation handle, drive movable sealing piece and remove, make movable sealing piece and through-hole not coincide completely, at this moment, extrude the roof after that, it is outside to make the response terminal extend to the roof through the through-hole, thereby insert the outside port with the response terminal, can adjust according to the in service behavior of sensor body, the flexibility is good.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the present invention showing the structure of removing the dustproof film;
FIG. 3 is a schematic view of a fixing device according to the present invention;
FIG. 4 is a front view of the present invention;
FIG. 5 is a schematic view of the structure of the present invention at A;
fig. 6 is a top view of the top plate of the present invention.
In the figure: 1. a sensor body; 111. an annular groove; 2. a terminal; 3. an octagonal nut; 4. an inductive terminal; 5. a transfer seat; 6. an adapter; 7. a data line; 8. a snap ring; 9. a fixing plate; 91. positioning holes; 10. a first spring; 11. a movable bottom plate; 12. a top plate; 121. a sector groove; 13. a dust-proof film; 14. a through hole; 15. rotating the handle; 16. a connecting handle; 17. a movable sealing sheet; 18. a telescopic core; 19. and a second spring.
Detailed Description
The following detailed description of the present invention is given for the purpose of better understanding technical solutions of the present invention by those skilled in the art, and the present description is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.
As shown in fig. 1 and 2, the specific structure of the present invention is: a high-precision force sensor comprises a sensor body 1, wherein the top of the sensor body 1 is provided with an integrally formed wiring end 2, the outer wall of the top of the wiring end 2 is provided with an octagonal nut 3, the middle of the top of the wiring end 2 is provided with an induction terminal 4, when the sensor is used, the induction terminal 4 is inserted into an external port, external pressure is induced by an induction element inside the induction terminal 4, the bottom of the sensor body 1 is provided with an adapter 5, the front side of the outer wall of the adapter 5 is provided with an adapter 6, the adapter 6 is provided with a data wire 7, a received signal is transmitted to an external instrument through the data wire 7, people can observe and monitor conveniently, the middle of the outer wall of the sensor body 1 is provided with an annular groove 111, the annular groove 111 is sleeved with a fixing device, the outer wall of the wiring end 2 is sleeved with a movable bottom plate, the outer side bonds and has the dust-proof membrane 13 between the activity bottom plate 11 outer fringe and the roof 12 outer fringe, and the dust-proof membrane 13 is made for silicon rubber, and elasticity is good, difficult fracture, activity bottom plate 11 with be connected with flexible core 18 between the roof 12, seted up in the middle of the roof 12 with response terminal 4 complex through-hole 14, when using, response terminal 4 extends to the outside of roof 12 through-hole 14, install on the roof 12 with through-hole 14 complex rotation handle 15, the antiskid head that the personnel of being convenient for held is installed at rotation handle 15 top.
Example 1: as shown in fig. 3 and 4, a high-precision force sensor comprises a sensor body 1, wherein the top of the sensor body 1 is provided with an integrally formed wiring end 2, the outer wall of the top of the wiring end 2 is provided with an octagonal nut 3, the middle of the top of the wiring end 2 is provided with an induction terminal 4, the bottom of the sensor body 1 is provided with an adapter 5, the front side of the outer wall of the adapter 5 is provided with an adapter 6, the adapter 6 is provided with a data line 7, the middle of the outer wall of the sensor body 1 is provided with an annular groove 111, the annular groove 111 is sleeved with a fixing device, the fixing device comprises a clamping ring 8 sleeved on the outer wall of the annular groove 111, the clamping ring 8 is made of brass, the inner wall of the clamping ring 8 is adhered with a rubber pad, the inner wall of the rubber pad is uniformly carved, so that the snap ring 8 is difficult to slide on the outer wall of the annular groove 111, the snap ring 8 is provided with a notch, two sides of the outer wall of the snap ring 8 are respectively provided with a fixing plate 9 in an outward extending manner, two fixing plates 9 are positioned on the same straight line, one side of the fixing plate 9 is provided with two positioning holes 91, one end of the fixing plate 9, which is consistent with the direction of the notch, is provided with a first spring 10, four first springs 10 are arranged, the axes of the first springs 10 are respectively collinear with the circle centers of the positioning holes 91 corresponding to wind, when in use, the snap ring 8 is firstly clamped on the outer wall of the annular groove 111, then a screw rod sequentially penetrates through the positioning holes 91 and the first springs 10 and is connected with the outside, thereby the fixing plates 9 are well installed, the fixing points when the sensor body 1 is installed are increased, the stability is good, when in, after the fixing device is installed, the restoring force of the first spring 10 enables the screw to be difficult to slide, in addition, the sensor body 1 is in elastic contact with an external installation point, the damping effect is good, and the stability and accuracy of signal transmission are higher.
Example 2: as shown in fig. 2, 4 and 5, a high-precision force sensor comprises a sensor body 1, wherein the top of the sensor body 1 is provided with an integrally formed wiring terminal 2, an octagonal nut 3 is installed on the outer wall of the top of the wiring terminal 2, an induction terminal 4 is installed in the middle of the top of the wiring terminal 2, a movable bottom plate 11 is sleeved on the outer wall of the wiring terminal 2, a round hole matched with the outer diameter of the wiring terminal 2 is formed in the middle of the movable bottom plate 11, a top plate 12 is arranged above the induction terminal 4, a dustproof film 13 is bonded on the outer side between the outer edge of the movable bottom plate 11 and the outer edge of the top plate 12, a telescopic core 18 is connected between the movable bottom plate 11 and the top plate 12, the telescopic core 18 is provided with six groups, the six groups of telescopic cores 18 are distributed along the circumference of the concentric circles of the through hole 14, outer tube top inside slidable mounting has the inner tube, the inner tube top extends to the outer tube outside and is fixed in roof 12 bottom, the outer tube with inner tube outer wall has cup jointed spring two 19 jointly, when spring two 19 is in normal condition, spring two 19 struts dust-proof membrane 13, make dust-proof membrane 13 can not the fold, response terminal 4 top supports the activity gasket 17 that covers through-hole 14, make activity bottom plate 11 remove to 2 outer wall tops of wiring end through the round hole until being blocked by octagonal nut 3, through such setting, make response terminal 4 can not contact outside dust and impurity, it is dustproof effectual, also play the guard action, can not cause colliding with to response terminal 4.
Example 3: as shown in fig. 2, 5 and 6, a high-precision force sensor comprises a sensor body 1, wherein the top of the sensor body 1 is provided with an integrally formed wiring terminal 2, an octagonal nut 3 is installed on the outer wall of the top of the wiring terminal 2, an induction terminal 4 is installed in the middle of the top of the wiring terminal 2, a movable bottom plate 11 is sleeved on the outer wall of the wiring terminal 2, a top plate 12 is arranged above the induction terminal 4, a through hole 14 matched with the induction terminal 4 is formed in the middle of the top plate 12, a rotating handle 15 matched with the through hole 14 is installed on the top plate 12, a fan-shaped groove 121 is formed in the top plate 12, the bottom of the rotating handle 15 extends into a connecting handle 16 fixedly connected in the fan-shaped groove 121, the bottom of the rotating handle 15 is rotatably installed at the bottom of the inner wall of the fan-shaped, the diameter of the movable sealing sheet 17 is larger than that of the through hole 14, when the sensor body 1 is not used, the movable sealing sheet 17 and the through hole 14 are overlapped to completely cover the through hole 14, the top of the sensing terminal 4 is propped against the movable sealing sheet 17, dust is difficult to enter the protection barrel formed by the movable bottom plate 11, the top plate 12 and the dustproof film 13 through the through hole 14, the fan-shaped groove 121 is fan-shaped, the radius of the fan-shaped groove 121 is larger than the sum of the lengths of the connecting handle 16 and the movable sealing sheet 17, the central angle of the fan-shaped groove 121 is 120 degrees, when the sensing terminal 4 needs to be inserted into an external port, the rotating handle 15 is rotated to drive the movable sealing sheet 17 to move, so that the movable sealing sheet 17 and the through hole 14 are not overlapped completely, at the moment, the top plate 12 is extruded, so that the sensing terminal 4 extends to the outside of the top plate 12, the flexibility is good, and at the moment, the movable bottom plate 11 moves to the bottom of the outer wall of the wiring terminal 2 through the round hole.
Further optimization is carried out on the basis of the embodiment: as shown in fig. 5, the maximum height of the telescopic core 18 is equal to the sum of the heights of the octagonal nut 3 and the sensing terminal 4, so that the space is saved, when the sensor body 1 is not used, the top of the sensing terminal 4 abuts against the movable sealing sheet 17, and the telescopic core 18 extends to the maximum height under the action of the self gravity and the second spring 19.
The invention has the specific working principle that: when the sensor is used, firstly, the rotating handle 15 is rotated to drive the movable sealing sheet 17 to move, so that the movable sealing sheet 17 and the through hole 14 are not overlapped completely, then the top plate 12 is extruded, so that the movable bottom plate 11 is moved to the bottom of the outer wall of the wiring end 2 through the circular hole, then the induction terminal 4 extends to the outside of the top plate 12 through the through hole 14, so that the induction terminal 4 is inserted into an external port, then the clamping ring 8 is clamped on the outer wall of the annular groove 111, then the screw rod sequentially penetrates through the positioning hole 91 and the first spring 10 and is connected with the outside, so that the fixing plate 9 is well installed, the fixing point when the sensor body 1 is installed is increased, the stability is good, the other end of the first spring 10 is abutted against the external mounting point during installation, the first spring 10 is stressed to shrink, after the fixing device is installed, the restoring force, the shock attenuation is effectual for signal transmission's steady orientation and accuracy are higher.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes may be made without departing from the principle of the present invention, and the technical features described above may be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.
Claims (8)
1. A high accuracy force sensor, includes sensor body (1), its characterized in that: the sensor comprises a sensor body (1), wherein the top of the sensor body (1) is provided with an integrally formed wiring end (2), an octagonal nut (3) is installed on the outer wall of the top of the wiring end (2), an induction terminal (4) is installed in the middle of the top of the wiring end (2), a switching seat (5) is installed at the bottom of the sensor body (1), a switching head (6) is arranged on the front side of the outer wall of the switching seat (5), a data line (7) is installed on the switching head (6), an annular groove (111) is formed in the middle of the outer wall of the sensor body (1), a fixing device is sleeved on the annular groove (111), a movable bottom plate (11) is sleeved on the outer wall of the wiring end (2), a top plate (12) is arranged above the induction terminal (4), a dustproof film (13) is bonded on the outer side between the outer edge of the movable bottom plate (11), a through hole (14) matched with the induction terminal (4) is formed in the middle of the top plate (12), and a rotating handle (15) matched with the through hole (14) is installed on the top plate (12).
2. A high accuracy force sensor according to claim 1, wherein: fixing device is including cup jointing snap ring (8) of ring channel (111) outer wall, the breach has been seted up on snap ring (8), snap ring (8) outer wall both sides all outwards extend and are provided with fixed plate (9), two fixed plate (9) are located same straight line, one side all seted up two locating holes (91) on fixed plate (9), fixed plate (9) with spring (10) are all installed to the one end that the breach direction is unanimous.
3. A high accuracy force sensor according to claim 1, wherein: the telescopic core (18) is provided with six groups, six groups the telescopic core (18) is along the circumference distribution of the concentric circles of the through holes (14), the telescopic core (18) is connected with the outer tube at the top of the movable bottom plate (11), an inner tube is slidably mounted inside the top of the outer tube, the top of the inner tube extends to the outside of the outer tube and is fixed at the bottom of the top plate (12), and the outer tube and the outer wall of the inner tube are jointly sleeved with a second spring (19).
4. A high accuracy force sensor according to claim 1, wherein: roof (12) inside is provided with sector groove (121), it extends to rotate handle (15) bottom the inside fixedly connected with connecting handle (16) of sector groove (121), it installs in sector groove (121) inner wall bottom to rotate handle (15) bottom, movable sealing piece (17) are installed to the connecting handle (16) other end, movable sealing piece (17) diameter is greater than the diameter of through-hole (14).
5. A high accuracy force sensor according to claim 4, wherein: the fan-shaped groove (121) is fan-shaped, the radius of the fan-shaped groove (121) is larger than the sum of the lengths of the connecting handle (16) and the movable sealing sheet (17), and the central angle of the fan-shaped groove (121) is 120 degrees.
6. A high accuracy force sensor according to claim 1, wherein: the middle of the movable bottom plate (11) is provided with a round hole matched with the outer diameter of the wiring end (2), and the maximum height of the telescopic core (18) is equal to the sum of the heights of the octagonal nut (3) and the induction terminal (4).
7. A high accuracy force sensor according to claim 2, wherein: the clamping ring (8) is made of brass, the inner wall of the clamping ring (8) is pasted with a rubber pad, and anti-skid lines are evenly engraved on the inner wall of the rubber pad.
8. A high accuracy force sensor according to claim 2, wherein: the number of the first springs (10) is four, and the axle centers of the first springs (10) are collinear with the circle centers of the positioning holes (91) corresponding to the wind respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010157058.2A CN111238691A (en) | 2020-03-09 | 2020-03-09 | High-precision force sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010157058.2A CN111238691A (en) | 2020-03-09 | 2020-03-09 | High-precision force sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111238691A true CN111238691A (en) | 2020-06-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010157058.2A Withdrawn CN111238691A (en) | 2020-03-09 | 2020-03-09 | High-precision force sensor |
Country Status (1)
| Country | Link |
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| CN (1) | CN111238691A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130342970A1 (en) * | 2012-06-20 | 2013-12-26 | Jeremy C. Franklin | Low-force dust seal |
| CN105911257A (en) * | 2016-06-25 | 2016-08-31 | 西安科技大学 | Multi-state undisturbed soil column infiltration simulation system and unsaturated osmotic coefficient determination method |
| CN206670840U (en) * | 2017-05-04 | 2017-11-24 | 厦门乃尔电子有限公司 | A kind of small-sized silicon piezoresistance type gas pressure sensor structure |
| CN207655527U (en) * | 2017-11-28 | 2018-07-27 | 科源（天津）电源部品有限公司 | A kind of lithium battery weighing device |
| CN208419857U (en) * | 2018-05-22 | 2019-01-22 | 郑松成 | Contactless linear displacement transducer |
| CN209903126U (en) * | 2019-03-29 | 2020-01-07 | 河南宁必至实业有限公司 | Dust collecting device of electric hammer |
-
2020
- 2020-03-09 CN CN202010157058.2A patent/CN111238691A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130342970A1 (en) * | 2012-06-20 | 2013-12-26 | Jeremy C. Franklin | Low-force dust seal |
| CN105911257A (en) * | 2016-06-25 | 2016-08-31 | 西安科技大学 | Multi-state undisturbed soil column infiltration simulation system and unsaturated osmotic coefficient determination method |
| CN206670840U (en) * | 2017-05-04 | 2017-11-24 | 厦门乃尔电子有限公司 | A kind of small-sized silicon piezoresistance type gas pressure sensor structure |
| CN207655527U (en) * | 2017-11-28 | 2018-07-27 | 科源（天津）电源部品有限公司 | A kind of lithium battery weighing device |
| CN208419857U (en) * | 2018-05-22 | 2019-01-22 | 郑松成 | Contactless linear displacement transducer |
| CN209903126U (en) * | 2019-03-29 | 2020-01-07 | 河南宁必至实业有限公司 | Dust collecting device of electric hammer |
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Application publication date: 20200605 |
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