CN107817441B - Knocking test device - Google Patents
Knocking test device Download PDFInfo
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- CN107817441B CN107817441B CN201711248488.XA CN201711248488A CN107817441B CN 107817441 B CN107817441 B CN 107817441B CN 201711248488 A CN201711248488 A CN 201711248488A CN 107817441 B CN107817441 B CN 107817441B
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- 238000012360 testing method Methods 0.000 title claims abstract description 40
- 238000000926 separation method Methods 0.000 claims abstract description 28
- 239000000306 component Substances 0.000 claims description 28
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 238000010079 rubber tapping Methods 0.000 claims description 9
- 239000008358 core component Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000006978 adaptation Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 9
- 230000009471 action Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 238000010009 beating Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to the field of product testing equipment, in particular to a knocking testing device. The invention has the advantages of simple structure, convenient assembly and the like, and can quickly adjust the knocking force through the matching use of the separation assembly and the knocking head, thereby improving the use convenience and the universality of the equipment; meanwhile, the knocking force of different keys of the same keyboard (or other products) or all keys of the same keyboard can be tested simultaneously, the universality is good, the adaptation products are wider, the testing efficiency is greatly improved, the knocking head replacement times are reduced, the knocking stability is improved, and the production cost is reduced.
Description
Technical Field
The invention relates to the field of product testing equipment, in particular to a knocking testing device.
Background
Some products such as computer keyboards, mobile phone keys or keys of other electrical equipment need to be subjected to knocking test to test technical parameters such as effectiveness, service life and the like of the keys, in the prior art, a driving mechanism is used for driving a knocking head to repeatedly knock the keys of the products, and as the knocking head and the driving mechanism are in hard fixed connection, the knocking force (knocking kinetic energy) is determined by the driving mechanism, whether a servo motor, a pneumatic device, a hydraulic device or an electromagnetic device is adopted, the knocking force is adjusted, meanwhile, after the knocking force of the equipment is adjusted for many times, the knocking test precision and the testing speed are often affected, so that the stability and the controllability of the knocking force of the equipment are poor.
Disclosure of Invention
The invention aims to solve the technical problem of providing a stable and reliable knocking test device which can quickly adjust knocking force and has high test speed.
In order to solve the technical problems, the technical scheme adopted by the invention for solving the technical problems is as follows:
The knocking test device comprises a rack, wherein the rack is arranged on a knocking head bracket, and at least one knocking head is arranged on the knocking head bracket; the machine frame is also provided with a separation assembly which is arranged on the knocking head bracket and is connected with the knocking head in a matched manner.
As a further improvement of the invention, the knocking head bracket comprises a supporting plate and a mounting plate, wherein the supporting plate is fixedly connected with the frame, the supporting plate is connected with the mounting plate through a vertical rod, knocking head mounting parts are arranged on the supporting plate and the mounting plate, the knocking head mounting parts on the supporting plate and the mounting plate are arranged in one-to-one correspondence, and the knocking heads are arranged in two knocking head mounting parts corresponding to the supporting plate and the mounting plate.
As a further improvement of the invention, the knocking head comprises a driving component, a knocking weight and a mounting weight, wherein the driving component is connected with the knocking weight through a connecting rod, the mounting weight is sleeved on the connecting rod between the driving component and the knocking weight, at least one groove is processed on the outer wall of the mounting weight, the diameter of the groove is smaller than the outer diameter of the knocking head, the driving component drives the mounting weight and the knocking weight to reciprocate, and the mounting weight and the knocking weight can carry out knocking test on a knocked object by knocking kinetic energy generated by the weight of the mounting weight and the knocking weight.
As a further improvement of the invention, the free end of the knocking weight, namely one end for knocking the object to be tested, is detachably connected with a knocking part.
As a further improvement of the invention, the mounting weight comprises at least one unit mounting weight, and the unit mounting weight is sleeved on the connecting rod.
As a further improvement of the present invention, the tapping weight includes: the weight connecting component and the weight body are connected to the lower part of the weight connecting component; the weight connecting part upper portion is equipped with a direction cavity, the connecting rod cover is located in the direction cavity and can freely slide, the direction cavity with the connecting rod is equipped with the spacing part of matching for the connecting rod can not follow on the weight connecting part breaks away from.
As a further improvement of the present invention, the driving assembly includes: the electromagnetic coil assembly is provided with a coil and an iron core assembly sleeved in the coil and capable of reciprocating according to the on-off of the coil; one end of the iron core component is connected with the connecting rod, and the other end of the iron core component is connected with the reset component.
As a further improvement of the invention, the separation assembly comprises a separation bracket which is connected with the knocking head bracket; the separating plate is arranged on the hollowed-out part of the separating bracket in a sliding way; the push-pull assembly is connected with the separation plate and drives the separation plate to reciprocate on the separation bracket.
As a further improvement of the invention, a plurality of through holes for penetrating the knocking head are arranged on the separating plate, the diameter of each through hole is matched with the outer diameter of the knocking head, and the adjacent through holes are connected through a separating groove.
As a further improvement of the invention, the push-pull component is a push-pull air cylinder, the push-pull air cylinder is connected with the frame, a clamping block is fixedly connected with the rod end of the piston rod of the push-pull air cylinder, and the clamping block is matched and connected with a clamping part arranged on the separating plate.
According to the technical scheme, the device has the advantages of simple structure, convenience in assembly and the like, and the knocking force can be rapidly switched without frequently replacing the knocking test jig through the matching use of the separation assembly and the knocking head, so that the using convenience and the universality of the device are improved; meanwhile, the knocking force of different keys of the same keyboard (or other products) or all keys of the same keyboard can be tested simultaneously, the universality is good, the adaptation products are wider, the testing efficiency is greatly improved, the knocking head replacement times are reduced, the knocking stability is improved, and the production cost is reduced.
Drawings
FIG. 1 is a schematic view of a knocking test device according to the present invention.
Fig. 2 is a schematic view of the separation assembly structure of the present invention.
Fig. 3 is a schematic view of the structure of the knocking head according to the present invention.
Fig. 4 is a cross-sectional view at fig. 3 A-A.
Reference numerals illustrate: 1-backplate, 12-supporting seat, 2-beating head, 21-backup pad, 22-montant, 23-mounting panel, 24-reset subassembly, 25-drive assembly, 251-connecting rod, 252-spacing part, 26-mount weight, 261-recess, 27-weight connecting part, 28-weight body, 29-beating part, 3-separation subassembly, 31-push-pull cylinder, 311-fixture block, 32-regulation pole, 321-stopper, 33-separation support, 34-separation board, 341-separation groove, 342-through-hole, 4-latch segment, 41-vaulting pole.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
Referring to fig. 1 and 2, a knocking test device comprises a rack, wherein the rack is arranged on a knocking head bracket, and at least one knocking head 2 is arranged on the knocking head bracket; the frame is also provided with a separation assembly 3, and the separation assembly 3 is arranged on the knocking head bracket and is connected with the knocking head 2 in a matched manner.
The machine frame comprises a back plate 1 and two supporting seats 12, the knocking head support is arranged on the two supporting seats 12, the back plate 1 is connected with a driving device, and the driving device comprises a mechanical arm, an XYZ three-axis module, a motor screw and any one of a screw nut.
The knocking head support comprises a support plate 21 and a mounting plate 23, wherein the support plate 21 is fixedly connected with the frame, the support plate 21 is connected with the mounting plate 23 through a vertical rod 22, knocking head mounting parts are arranged on the support plate 21 and the mounting plate 23, the knocking head mounting parts on the support plate 21 and the mounting plate 23 are arranged in one-to-one correspondence, and the knocking heads 2 are arranged in two knocking head mounting parts corresponding to the support plate 21 and the mounting plate 23.
The knocking head 2 in the scheme has an elongated shape, the knocking head 2 can be firmly and reliably installed by adopting the supporting plate 21 and the mounting plate 23, shaking of the knocking head is avoided, and the structure is simple, the weight is light, and the cost is low.
In order to realize low cost and ensure better expansion performance, the installation parts of the knocking heads 2 on the supporting plate 21 and the installation plate 23 are arranged in a matrix. To increase the versatility of the product. The position of the knocking head 2 can be adjusted according to the specification and shape of the corresponding tested product.
The knocking head 2 comprises a driving assembly 25, a knocking weight and a mounting weight 26, wherein the driving assembly 25 is connected with the knocking weight through a connecting rod 251, the mounting weight 26 is sleeved on the connecting rod 251 between the driving assembly 25 and the knocking weight, at least one groove 261 is processed on the outer wall of the mounting weight 26, the diameter of the groove 261 is smaller than the outer diameter of the knocking head 2, the driving assembly 25 drives the mounting weight 26 and the knocking weight to reciprocate, and the knocking weight 26 and the knocking weight can carry out knocking test on a knocked object by knocking kinetic energy generated by the weight of the mounting weight 26 and the knocking weight.
According to the scheme, the weight of the required knocking weight can be configured according to the requirement, when the knocking test is carried out with smaller knocking force, the mounted weight 26 and the knocking weight can be separated through the separation assembly 3, the knocking weight falls down to carry out the knocking test under the driving of the driving assembly 25, when the knocking test with larger knocking force is required, the mounted weight 26 and the knocking weight fall down simultaneously to carry out the knocking test under the driving of the driving assembly 25, the knocking force can be quickly adjusted, and the using convenience and the universality of the equipment are improved; meanwhile, the method can test the knocking force of different keys of the same keyboard (or other products) or all keys of the same keyboard or test more than two identical products or different products simultaneously, and is very flexible and simple.
The free end of the striking weight, i.e. the end striking the object to be tested, is detachably connected with a striking member 29.
The mounting weight 26 comprises at least one unit mounting weight 26, and the unit mounting weight 26 is sleeved on the connecting rod 251.
The weight used in the whole knocking test is conveniently adjusted by adjusting the number of the unit knocking weights and the unit mounting weights 26, so that the knocking force is conveniently adjusted, and the using convenience and the universality of the equipment are improved.
The knocking weight comprises: a weight connecting member 27 and a weight body 28 connected to a lower portion of the weight connecting member 27; the upper part of the weight connecting part 27 is provided with a guiding cavity, the connecting rod 251 is sleeved in the guiding cavity and can slide freely, and the guiding cavity and the connecting rod 251 are provided with matched limiting parts 252, so that the connecting rod 251 cannot be separated from the weight connecting part 27.
The tapping weight comprises at least one weight body 28, the weight body 28 being detachable.
The weight connecting portion sets up the direction cavity, and the connecting rod 251 can set up very short, great saving the space, reduced equipment volume, for the quantity of more nimble change unit weight provides the possibility, in addition, the connection between weight connecting piece 27 and the weight body 28 can be inseparabler and firm, and it is also more convenient to change, and equipment operation is more reliable and stable.
The drive assembly 25 includes: the electromagnetic coil assembly is provided with a coil and an iron core assembly sleeved in the coil and capable of reciprocating according to the on-off of the coil; one end of the iron core component is connected with the connecting rod 251, and the other end is connected with the reset component 24.
The reset component 24 can be composed of elastic elements, when the downward knocking is needed, the electromagnetic coil is electrified, the iron core component moves downward under the action of electromagnetic force to drive the connecting rod 251 to move downward together, so that the knocking weight or the mounting weight 26 loses suspension support and is in a suspended state, and therefore the mounting weight 26 or the knocking weight falls freely to knock a measured object, and at the moment, the reset component 24 is compressed and stored with energy; when the knocking is finished, the electromagnetic coil is powered off, the electromagnetic force is eliminated, the energy of the reset assembly 24 is released, the iron core assembly is brought back to the initial position, and the connecting rod 251 also moves upwards, so that the knocking weight or the mounting weight 26 is driven to return to the initial position.
The driving component 25 is movably connected with the mounting weight 26 and the knocking weight, no energy is transmitted between the driving component 25 and the mounting weight 26, when the driving component 25 is motionless, the knocking weight and the mounting weight 26 are motionless, and when the driving component 25 is started, the driving component falls freely under the action of the weight of the driving component and knocks a tested product, so that constant knocking force is obtained, and the knocking is reliable. After the knocking is finished, the driving component 25 drives the knocking weight or the knocking weight and the mounting weight 26 to return to the initial position, the next knocking is prepared, and the cycle is performed to complete all the testing work
The separation assembly 3 comprises a separation bracket 33, and the separation bracket 33 is connected with the knocking head bracket; the separation plate 34 is slidably arranged at the hollowed-out part of the separation bracket 33; and the push-pull assembly is connected with the separation plate 34 and drives the separation plate 34 to reciprocate on the separation bracket 33.
The separating plate 34 is provided with a plurality of through holes 342 for penetrating the knocking head 2, the diameter of each through hole 342 is matched with the outer diameter of the knocking head 2, adjacent through holes 342 are connected through a separating groove 341, and the width of each separating groove 341 is matched with the diameter of the corresponding groove 261.
The driving component and the push-pull component can provide power for a hydraulic device, a pneumatic device, a servo motor (driving screw, cam and the like to provide reciprocating motion) and the like.
The push-pull assembly comprises the following components:
in this scheme, the push-pull component may be a push-pull cylinder 31, the push-pull cylinder 31 is connected with the rack, a clamping block 311 is fixedly connected to a rod end of a piston rod of the push-pull cylinder 31, and the clamping block 311 is cooperatively connected with a clamping part disposed on the separating plate 34.
In this scheme, the push-pull assembly may also be a push-pull motor, the push-pull motor is connected with the frame, a lead screw is disposed on an output shaft of the push-pull motor, and the lead screw is connected with a nut disposed on the separating plate 34.
In this scheme push-and-pull subassembly still can be the pneumatic cylinder, the pneumatic cylinder is connected with the frame, be equipped with the dog on the output shaft of pneumatic cylinder, the dog with set up the separator plate is connected.
In this scheme push-and-pull subassembly still can be the pneumatic cylinder, the pneumatic cylinder is connected with the frame, be equipped with the dog on the output shaft of pneumatic cylinder, the dog with set up the separator plate is connected.
In this scheme push-and-pull subassembly still can be the pneumatic cylinder, the pneumatic cylinder is connected with the frame, be equipped with the dog on the output shaft of pneumatic cylinder, the dog with the division board is connected.
In this scheme push-and-pull subassembly can also be cam and cam lever, the cam lever sets up in the frame and one end is connected with the separator plate, the cam lever other end is connected with the cam cooperation.
In the scheme, the push-pull assembly can also be a push-pull rod or a pull wire, the push-pull rod or the pull wire is arranged on the rack, one end of the push-pull rod or the pull wire is connected with the separating plate, and the other end of the push-pull rod or the pull wire is connected with the handle.
The drop of the mounted weight 26 is limited by the push-pull assembly, so that the knocking force is controlled rapidly.
The frame is provided with a limiting component, the limiting component comprises an adjusting bush and an adjusting rod 32, the adjusting bush is sleeved on the adjusting rod 32, the adjusting rod 32 is provided with a limiting block 321, and the limiting block 321 is connected with a limiting groove arranged on the separating plate 34 in a matched mode.
The separating assembly 3 is arranged on the vertical rod 22 in a sliding manner, the bottom of the separating assembly 3 is arranged on the adjusting assembly, the adjusting assembly comprises a supporting rod 41 and a locking block 4, the supporting rod 41 is fixedly connected with the locking block 4, and the locking block 4 is connected with the vertical rod 22.
The specific action flow is as follows:
Electromagnetic coil assembly suction-pushing and pulling air cylinder 31 to drive separating plate 34 to return-separating plate 34 to leave the position of mounted weight 26-mounting weight 26 and knocking weight simultaneously descending-realizing knocking test, wherein the knocking force is the weight force of mounted weight 26+knocking weight at the moment
Electromagnetic coil assembly suction-push-pull air cylinder 31 pulls and drives separating plate 34 to extend, separating plate 34 limits a hanging air cylinder, hanging weight 26 limits, knocking weight descending-knocking test is achieved, and knocking force is the gravity of knocking weight at the moment
Brief description of the actions: the electromagnetic coil component is attracted, the knocking head 2 automatically falls back without limit, and the force for knocking the product is changed by limiting the hanging gas cylinder by the unlimited knocking weight and pulling the separating plate 34 by the push-pull cylinder 31.
According to the technical scheme, the invention has the advantages of simple structure, convenience in assembly and the like, and the knocking force can be quickly adjusted through the matching use of the separation assembly 3 and the knocking head 2, so that the convenience in use and the universality of the equipment are improved; meanwhile, the knocking force of different keys of the same keyboard (or other products) or all keys of the same keyboard can be tested simultaneously, the universality is good, the adaptation products are wider, the testing efficiency is greatly improved, meanwhile, the replacing times of the knocking head 2 are reduced, the knocking stability is improved, and the production cost is reduced.
The above-described embodiments are merely preferred embodiments for fully explaining the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present invention, and are intended to be within the scope of the present invention. The protection scope of the invention is subject to the claims.
Claims (8)
1. The knocking test device is characterized by comprising a rack, wherein a knocking head bracket is arranged on the rack, and at least one knocking head is arranged on the knocking head bracket; the machine frame is also provided with a separation assembly which is arranged on the knocking head bracket and is connected with the knocking head in a matched manner, and the separation assembly comprises a separation bracket which is connected with the knocking head bracket; the separating plate is arranged on the hollowed-out part of the separating bracket in a sliding way; the push-pull assembly is connected with the separating plate, the push-pull assembly drives the separating plate to reciprocate on the separating support, the knocking head comprises a knocking weight and a mounting weight, the mounting weight is separated from the knocking weight by the separating assembly, the falling of the mounting weight is limited by the push-pull assembly, a plurality of through holes for penetrating the knocking head are formed in the separating plate, the diameter of each through hole is matched with the outer diameter of the knocking head, and the adjacent through holes are connected through a separating groove.
2. The knocking test device according to claim 1, wherein the knocking head support comprises a support plate and a mounting plate, the support plate is fixedly connected with the frame, the support plate is connected with the mounting plate through a vertical rod, knocking head mounting parts are arranged on the support plate and the mounting plate, the knocking head mounting parts on the support plate and the mounting plate are arranged in a one-to-one correspondence manner, and the knocking heads are arranged in two knocking head mounting parts corresponding to the support plate and the mounting plate.
3. The knocking test device according to claim 1, wherein the knocking head comprises a driving assembly, a knocking weight and a mounting weight, the driving assembly is connected with the knocking weight through a connecting rod, the mounting weight is sleeved on a connecting rod between the driving assembly and the knocking weight, at least one groove is processed on the outer wall of the mounting weight, the diameter of the groove is smaller than the outer diameter of the knocking head, the driving assembly drives the mounting weight and the knocking weight to reciprocate, and the mounting weight and the knocking weight can conduct knocking test on an object to be knocked by knocking kinetic energy generated by the weight of the mounting weight and the knocking weight.
4. A tapping test device according to claim 3, wherein the free end of the tapping weight, i.e. the end that taps the object to be tapped, is detachably connected with a tapping member.
5. The tapping test device according to claim 3, wherein the mounting weight comprises at least one unit mounting weight, the unit mounting weight being sleeved on the connecting rod.
6. The tapping test device according to any one of claims 3 to 5, wherein the tapping weight comprises: the weight connecting component and the weight body are connected to the lower part of the weight connecting component; the weight connecting part upper portion is equipped with a direction cavity, the connecting rod cover is located in the direction cavity and can freely slide, the direction cavity with the connecting rod is equipped with the spacing part of matching for the connecting rod can not follow on the weight connecting part breaks away from.
7. A tap testing device according to any one of claims 3 to 5, wherein said drive assembly comprises: the electromagnetic coil assembly is provided with a coil and an iron core assembly sleeved in the coil and capable of reciprocating according to the on-off of the coil; one end of the iron core component is connected with the connecting rod, and the other end of the iron core component is connected with the reset component.
8. The tapping test device according to claim 1, wherein the push-pull assembly is a push-pull cylinder, the push-pull cylinder is connected with the frame, a clamping block is fixedly connected to a rod end of a piston rod of the push-pull cylinder, and the clamping block is matched and connected with a clamping part arranged on the separating plate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN201711248488.XA CN107817441B (en) | 2017-12-01 | 2017-12-01 | Knocking test device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN201711248488.XA CN107817441B (en) | 2017-12-01 | 2017-12-01 | Knocking test device |
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CN107817441A CN107817441A (en) | 2018-03-20 |
CN107817441B true CN107817441B (en) | 2024-05-03 |
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CN201711248488.XA Active CN107817441B (en) | 2017-12-01 | 2017-12-01 | Knocking test device |
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Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN112305360B (en) * | 2020-11-02 | 2021-09-24 | 吉林大学 | Reliability test device and method for operation panel of numerical control machine tool |
CN112958470B (en) * | 2021-02-04 | 2022-07-15 | 德州学院 | Batch testing device and method for computer keyboards |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101168764B1 (en) * | 2012-05-24 | 2012-07-30 | 주식회사 아이엔텍 | Ballistic separator |
CN204165729U (en) * | 2014-10-27 | 2015-02-18 | 苏州杰锐思自动化设备有限公司 | One knocks test with knocking proving installation |
CN105445654A (en) * | 2014-09-29 | 2016-03-30 | 苏州杰锐思自动化设备有限公司 | Knocking head for knocking test and knocking testing device |
CN205222510U (en) * | 2015-11-27 | 2016-05-11 | 河南新科起重机股份有限公司 | Control cabinet for hoist |
CN207541224U (en) * | 2017-12-01 | 2018-06-26 | 苏州杰锐思自动化设备有限公司 | A kind of percussion test device |
-
2017
- 2017-12-01 CN CN201711248488.XA patent/CN107817441B/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101168764B1 (en) * | 2012-05-24 | 2012-07-30 | 주식회사 아이엔텍 | Ballistic separator |
CN105445654A (en) * | 2014-09-29 | 2016-03-30 | 苏州杰锐思自动化设备有限公司 | Knocking head for knocking test and knocking testing device |
CN204165729U (en) * | 2014-10-27 | 2015-02-18 | 苏州杰锐思自动化设备有限公司 | One knocks test with knocking proving installation |
CN205222510U (en) * | 2015-11-27 | 2016-05-11 | 河南新科起重机股份有限公司 | Control cabinet for hoist |
CN207541224U (en) * | 2017-12-01 | 2018-06-26 | 苏州杰锐思自动化设备有限公司 | A kind of percussion test device |
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CN107817441A (en) | 2018-03-20 |
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