CN215374311U - Device for testing knocking force of membrane switch - Google Patents
Device for testing knocking force of membrane switch Download PDFInfo
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- CN215374311U CN215374311U CN202121867055.4U CN202121867055U CN215374311U CN 215374311 U CN215374311 U CN 215374311U CN 202121867055 U CN202121867055 U CN 202121867055U CN 215374311 U CN215374311 U CN 215374311U
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- membrane switch
- valve core
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- hole
- electromagnetic valve
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Abstract
The utility model provides a membrane switch knocking force testing device, which comprises a base, a testing frame capable of moving up and down, and a driving assembly for driving the testing frame to move, wherein the testing frame comprises a lower testing plate, a supporting column and an upper testing plate, a first through hole is formed in the lower testing plate, a round rod capable of moving up and down is arranged in the first through hole, the lower end part of the round rod protrudes out of the lower testing plate, an anti-falling round platform is connected with the upper end part of the round rod, a second through hole is formed in the upper testing plate, an electromagnetic valve is arranged in the second through hole, the valve core is suspended above the round platform when the electromagnetic valve is powered on, the whole weight of the valve core is supported on the round platform when the electromagnetic valve is powered off, the round rod and the round platform can knock on a membrane switch by using dead weight by moving down the testing frame during testing, the upper limit and the lower limit of the knocking force can be determined by using dead weight of the electromagnetic valve, the round rod and the round platform and the membrane switch can be knocked by using dead weight when the electromagnetic valve is powered off, the method is not influenced by voltage and current fluctuation, and has the advantages of high accuracy, low misjudgment rate and wide application range.
Description
Technical Field
The utility model belongs to the technical field of force testing, and particularly relates to a device for testing the knocking force of a membrane switch.
Background
The membrane switch is a novel electronic switch, is used for controlling the on-off of a loop where the membrane switch is located, is widely applied to assembling products such as various key panels, computer keyboards and the like, is usually triggered in a knocking mode, and needs to test the knocking force of the membrane switch when the membrane switch is manufactured so as to meet the requirements of membrane switches with different occasions and different functions.
The existing membrane switch knocking force testing device mostly adopts ejection of a valve core of an electromagnetic valve during electrification to simulate knocking of a membrane switch, and judges whether the knocking force of the membrane switch meets requirements or not through the sum of gravity and electromagnetic force of the valve core, but the scheme at least has the following defects:
1. the upper and lower limits of the knocking force cannot be judged in one test;
2. the electromagnetic force is greatly influenced by voltage and current fluctuation, and the misjudgment rate is high and the application range is narrow when the membrane switch with smaller knocking force and knocking force range is tested.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide the membrane switch knocking force testing device which can judge the upper limit and the lower limit of the knocking force in one test, and has low misjudgment rate and wide application range.
In order to achieve the above object, the present invention adopts a technical solution that a membrane switch knocking force testing apparatus includes:
the upper surface of the base is used for placing a membrane switch to be tested;
the test frame is arranged on the base in a vertically movable mode and comprises a lower test board, support columns and an upper test board, and the upper test board is supported above the lower test board through the support columns;
the driving assembly is used for driving the test frame to move up and down;
the lower test board is provided with a first through hole, a round rod capable of moving up and down is arranged in the first through hole, the lower end part of the round rod protrudes out of the lower test board downwards, and the upper end part of the round rod is connected with a round table for preventing the round rod from being separated from the first through hole;
a second through hole corresponding to the first through hole is formed in the upper test plate, an electromagnetic valve is arranged in the second through hole, when the electromagnetic valve is powered on, a valve core of the electromagnetic valve is suspended above the circular table, and when the electromagnetic valve is powered off, the valve core moves downwards under the action of gravity, so that all the weight of the valve core is supported on the circular table;
during testing, the testing frame moves downwards to enable the lower end face of the round rod to be tightly abutted against the film switch, so that the round table is separated from the upper surface of the lower testing plate.
Preferably, the circular truncated cone is detachably arranged at the upper end of the circular rod.
Preferably, the upper end of the valve core is provided with a detachable weight.
Preferably, an annular flange for preventing the valve core from being separated from the solenoid valve is connected to the lower end of the valve core.
Further preferably, the annular flange is formed by a nut screwed to a lower end portion of the valve body.
Further preferably, there are at least two of said nuts.
Further preferably, the diameter of the annular flange is equal to or smaller than the maximum diameter of the circular truncated cone.
Preferably, when the valve core is suspended, the gap between the valve core and the circular truncated cone is 1-3 mm.
Preferably, the lower test plate is disposed above the base movably up and down by guide posts.
Further preferably, the driving assembly comprises a servo motor and a screw pair.
Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages:
1. during testing, the round rod and the circular truncated cone can be knocked on the film switch by using the dead weight through downward movement of the testing frame, the lower limit value of the knocking force is simulated, the valve core, the round rod and the circular truncated cone can be knocked on the film switch by using the dead weight through power failure of the electromagnetic valve, the upper limit value of the knocking force is simulated, and whether the upper limit value and the lower limit value of the knocking force meet requirements can be judged through one-time testing;
2. the pure gravity test is not influenced by voltage and current fluctuation, and has high accuracy, low misjudgment rate and wide application range.
Drawings
Fig. 1 is a schematic front view of a first embodiment of the present invention, in which no test is performed.
Fig. 2 is an enlarged partial sectional view at a in fig. 1.
Fig. 3 is a schematic front view of a first embodiment of the present invention, which is in a lower tapping force limit test state.
Fig. 4 is an enlarged partial sectional view at B in fig. 3.
Fig. 5 is a schematic front view of a first embodiment of the present invention, which is in a tapping force upper limit test state.
Fig. 6 is an enlarged partial cross-sectional view at C in fig. 5.
Wherein: 1. a membrane switch; 10. a base; 11. an upper surface; 20. a test jig; 21. a lower test board; 211. a first through hole; 212. a round bar; 213. a circular truncated cone; 214. a guide post; 22. a support pillar; 23. a lower test board; 231. a second through hole; 232. an electromagnetic valve; 233. a valve core; 234. a weight; 235. adjusting the nut; 236. locking the nut; 237. a gap; 30. a drive assembly; 31. a servo motor; 32. a screw rod; 33. a nut; 34. and (4) a synchronous belt.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the utility model easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the utility model.
The up-down direction described in the present invention refers to the up-down direction in fig. 1.
As shown in fig. 1 to 6, the present invention provides a device for testing a striking force of a membrane switch, comprising: base 10, test jig 20 and drive assembly 30, wherein, the upper surface 11 of base 10 is on a parallel with the horizontal plane, the upper surface 11 of base 10 is used for placing the membrane switch 1 that awaits measuring, test jig 20 can set up on base 10 with reciprocating, test jig 20 includes and surveys test panel 21 down, support column 22, go up test panel 23, the plane that lower test panel 21 belonged to is on a parallel with the horizontal plane, go up test panel 23 and be on a parallel with lower test panel, go up test panel 23 and pass through support column 22 and support the top of testing panel 21 down, drive assembly 30 is used for driving test jig 20 and reciprocates.
In this embodiment, a plurality of first through holes 211 are formed in the lower test plate 21, a circular rod 212 capable of moving up and down is disposed in the first through hole 211, a lower end of the circular rod 212 protrudes downward from a lower surface of the lower test plate 21, a circular truncated cone 213 for preventing the circular rod 212 from being separated from the first through hole 211 is connected to an upper end of the circular rod 212, a second through hole 231 corresponding to the first through hole 211 is formed in the upper test plate 23, an electromagnetic valve 232 is disposed in the second through hole 231, the electromagnetic valve 232 is an inverse electromagnetic valve, the inverse direction is that a valve core 233 of the electromagnetic valve 232 is suspended above the circular truncated cone 213 when the electromagnetic valve 232 is energized, a gap 237 is formed between the valve core 233 and the circular truncated cone 213, when the electromagnetic valve 232 is de-energized, the valve core 233 moves downward under the action of gravity until all the weight of the valve core 233 is supported on the circular truncated cone 213, and the gravity of the circular rod 212 and the circular truncated cone 213 corresponds to a lower limit value of a tapping force of the membrane switch 1, the weight of the round rod 212, the round table 213, and the valve body 233 corresponds to the upper limit of the striking force of the membrane switch 1.
The device has the advantages that during testing, the round rod and the circular truncated cone can be knocked on the film switch by the aid of self weight through downward movement of the testing frame, the lower limit value of knocking force is simulated, the valve core, the round rod and the circular truncated cone can be knocked on the film switch by the aid of self weight through power failure of the electromagnetic valve, the upper limit value of the knocking force is simulated, and whether the upper limit value and the lower limit value of the knocking force meet requirements can be judged through one-time testing; in addition, the testing device adopts a pure gravity testing mode, is not influenced by voltage and current fluctuation, and has high accuracy, low misjudgment rate and wide application range.
In this embodiment, the circular truncated cone 213 is detachably disposed at the upper end of the circular rod 212, the sum of the gravity of the circular rod 212 and the circular truncated cone 213 can be conveniently adjusted by replacing the circular truncated cones 213 with different weights, so as to match the lower limit values of the striking force of different membrane switches 1, and meanwhile, the detachable weight 234 is disposed at the upper end of the valve core 233, and the sum of the gravity of the circular rod 212, the circular truncated cones 213, and the valve core 233 can be conveniently adjusted by replacing the weight 234 with different weights, so as to match the upper limit values of the striking force of different membrane switches 1.
In the present embodiment, the clearance 237 is preferably 1 to 3mm when the spool 233 floats, which is advantageous in that it is possible to easily distinguish the determination of the upper and lower limits of the striking force of the membrane switch 1 and reduce the impact force when the spool 233 descends onto the circular truncated cone 213, thereby avoiding the interference when the upper limit of the striking force of the membrane switch 1 is determined.
In the present embodiment, the lower end of the valve body 233 is connected to an annular flange for preventing the valve body 233 from being detached from the solenoid valve 232, the diameter of the annular flange is equal to or smaller than the maximum diameter of the circular truncated cone 213 and larger than the minimum diameter of the circular truncated cone 213, specifically, the annular flange is formed by a nut screwed to the lower end of the valve body 233, and the lower end surface of the valve body 233 is higher than the lower surface of the nut, which is advantageous in that the gap 237 can be easily adjusted to accommodate the circular truncated cones 213 of different weights and heights.
To prevent the nut from loosening, in this embodiment there are two nuts, respectively a lower adjustment nut 235 and an upper locking nut 236.
In this embodiment, the lower testing board 21 is disposed above the base 10 through the guiding column 214 in a vertically movable manner, the driving assembly 30 includes a servo motor 31 and a screw pair, the screw pair includes a screw 32 and a nut 33, a lower end of the screw 32 is rotatably connected to the base 10, an upper end of the screw 32 passes through the nut 33 disposed on the lower testing board 21, the servo motor 31 is disposed on the base 10, the servo motor 31 drives the screw 32 to rotate through a synchronous pulley and a synchronous belt 34, and thus, the advantage of this configuration is that the moving direction and the moving distance of the testing frame 20 can be precisely controlled.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. A membrane switch rapping force testing apparatus, comprising:
the upper surface of the base is used for placing a membrane switch to be tested;
the test frame is arranged on the base in a vertically movable mode and comprises a lower test board, support columns and an upper test board, and the upper test board is supported above the lower test board through the support columns;
the driving assembly is used for driving the test frame to move up and down;
the method is characterized in that:
the lower test board is provided with a first through hole, a round rod capable of moving up and down is arranged in the first through hole, the lower end part of the round rod protrudes out of the lower test board downwards, and the upper end part of the round rod is connected with a round table for preventing the round rod from being separated from the first through hole;
and a second through hole corresponding to the first through hole is formed in the upper test plate, an electromagnetic valve is arranged in the second through hole, when the electromagnetic valve is powered on, a valve core of the electromagnetic valve is suspended above the circular truncated cone, and when the electromagnetic valve is powered off, the valve core moves downwards under the action of gravity, so that all the weight of the valve core is supported on the circular truncated cone.
2. The membrane switch rapping force testing device of claim 1, wherein: the round platform is detachably arranged at the upper end of the round rod.
3. The membrane switch rapping force testing device of claim 1, wherein: the upper end of the valve core is provided with a detachable weight.
4. The membrane switch rapping force testing device of claim 1, wherein: the lower end of the valve core is connected with an annular flange for preventing the valve core from being separated from the electromagnetic valve.
5. The membrane switch rapping force testing device of claim 4, wherein: the annular flange is composed of a nut which is connected with the lower end part of the valve core in a threaded mode.
6. The membrane switch rapping force testing device of claim 5, wherein: the number of the nuts is at least two.
7. The membrane switch rapping force testing device of claim 4, wherein: the diameter of the annular flange is smaller than or equal to the maximum diameter of the circular truncated cone.
8. The membrane switch rapping force testing device of claim 1, wherein: when the valve core is suspended, the clearance between the valve core and the circular truncated cone is 1-3 mm.
9. The membrane switch rapping force testing device of claim 1, wherein: the lower test board is movably disposed above the base up and down through guide posts.
10. The membrane switch rapping force testing device of any of claims 1-9, wherein: the driving assembly comprises a servo motor and a screw rod pair.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121867055.4U CN215374311U (en) | 2021-08-11 | 2021-08-11 | Device for testing knocking force of membrane switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121867055.4U CN215374311U (en) | 2021-08-11 | 2021-08-11 | Device for testing knocking force of membrane switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215374311U true CN215374311U (en) | 2021-12-31 |
Family
ID=79617766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121867055.4U Active CN215374311U (en) | 2021-08-11 | 2021-08-11 | Device for testing knocking force of membrane switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215374311U (en) |
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2021
- 2021-08-11 CN CN202121867055.4U patent/CN215374311U/en active Active
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