A key position testing device for a membrane switch

Abstract

This invention discloses a key position testing device for membrane switches, belonging to the field of membrane switch testing technology. It includes a workbench with multiple support rods fixedly installed on its top wall. A top plate is fixedly installed at the top of each support rod, and an electric telescopic rod is fixedly installed on the top plate. A mounting plate is fixedly installed on the output end of the electric telescopic rod, and a testing component is mounted on the mounting plate. A limiting component is provided on the workbench; the limiting component includes a rotating disk rotatably mounted on the top wall of the workbench. This solution utilizes the cooperation between the drive groove of the vertical plate and the clamping plate. During the pressing of the testing component, the vertical plate automatically pushes the two clamping plates closer together. This not only allows the membrane switch to be accurately pushed directly under the testing component via the inclined plate, achieving manual alignment, but also simultaneously clamps and fixes the membrane switch. Furthermore, material can be loaded into adjacent clamping positions during testing, enabling simultaneous testing and loading, thus improving testing efficiency.

Description

Technical Field

[0001] This invention relates to the field of membrane switch testing technology, and more specifically, to a key testing device for membrane switches. Background Technology

[0002] A membrane switch is a thin, flexible, or rigid integrated tactile electronic switch, also called a membrane button or membrane panel. It is the mainstream tactile control component that replaces traditional mechanical buttons. Its core features are thinness, lightness, waterproofness, high integration, and low cost. To improve the rigidity of the membrane switch, a PC / ABS rigid base plate is usually added under the adhesive layer. If press feedback is required, a metal or silicone spring is added to the button. To improve the performance of the membrane switch, the key positions of the membrane switch are usually tested after production.

[0003] Traditional membrane switch testing mostly employs manual or semi-manual methods. The manual method involves manually energizing the membrane switch for testing, while the semi-manual method involves manually placing the membrane switch in a designated position and then manually operating mechanical equipment to complete the testing. However, neither type of testing equipment can actively complete the membrane switch testing process, thus severely affecting testing efficiency.

[0004] To address the aforementioned issues, some solutions have been proposed in the prior art. For example, Chinese invention patent CN117849608A discloses a key testing device for membrane switches. This device uses a key testing roller that can roll on the surface of the membrane switch and presses the switch key by pushing out an internal keycap, replacing manual pressing and mechanical pressing at fixed points. Combined with a pin holder, it can perform wire conductivity testing on the ribbon cables of membrane switches in different states, improving testing efficiency. However, in actual use, due to the special requirements of membrane switches, the size of the switch keys may vary. If the key testing roller is used to press the switch keys directly, some smaller keys may not be fully pressed, requiring rework and retesting, severely impacting testing efficiency. Summary of the Invention

[0005] To address the problems existing in the prior art, the purpose of this invention is to provide a key testing device for membrane switches, which can improve testing efficiency.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A key position testing device for a membrane switch includes a workbench, on the top wall of the workbench multiple support rods fixedly installed, on the top of the support rods a top plate fixedly installed, on the top plate an electric telescopic rod fixedly installed, and on the output end of the electric telescopic rod a mounting plate fixedly installed, on the mounting plate a testing component is provided, and on the workbench a limiting component is provided. The limiting component includes a rotating disk rotatably mounted on the top wall of the workbench. Multiple horizontal plates are uniformly fixedly mounted on the rotating disk. Sliding grooves are symmetrically opened on the horizontal plates. Clamping plates are slidably mounted in the sliding grooves. A first spring is installed between the clamping plates and the sliding grooves. A vertical plate is fixedly mounted on the bottom wall of the mounting plate. A drive groove is opened at the bottom end of the vertical plate. An unloading component is provided on the workbench.

[0008] Furthermore, the testing assembly includes a mounting rod fixedly mounted on the bottom wall of the mounting plate, a pressing plate threaded onto the mounting rod, pressing rods uniformly fixedly mounted on the pressing plate, test lamps uniformly fixedly mounted on the mounting plate, and conductive pins cooperating with a membrane switch fixedly mounted on the pressing plate. The unloading assembly includes a mounting cylinder fixedly mounted on the workbench, a piston rod vertically slidably mounted inside the mounting cylinder and fixedly connected to the mounting plate, and the mounting cylinder is filled with a pneumatic medium or incompressible fluid. A horizontal cavity is formed on the horizontal plate, a push rod is slidably mounted inside the horizontal cavity, and a pusher plate is fixedly mounted on the push rod. A first conveyor belt cooperating with the pusher plate is provided on the workbench, and a communication assembly communicating with the horizontal cavity is provided on the mounting cylinder. The mounting cylinder is connected to the horizontal cavity through the communication assembly. While the mounting plate drives the testing assembly to press down for testing, the piston rod is pressure-driven, driving the medium inside the mounting cylinder to push the pusher plate, thus achieving simultaneous testing and unloading.

[0009] Furthermore, the communication component includes a rotating ring rotatably mounted on the mounting cylinder, the rotating ring having a first communication hole communicating with the horizontal cavity, and the mounting cylinder having a second communication hole communicating with the first communication hole evenly distributed on the mounting cylinder, and the rotating ring having a screening component.

[0010] Furthermore, the screening component includes a linkage groove formed on the rotating ring, a blocking plate slidably installed in the linkage groove, a second spring installed between the blocking plate and the linkage groove, a connecting groove formed on the blocking plate that connects to the first connecting hole, a first magnet embedded in the blocking plate, a linkage rod fixedly installed on the mounting plate, and an electromagnet embedded in the linkage rod that attracts the first magnet, and the electromagnet is electrically connected to multiple test lamps. When multiple test lamps are lit simultaneously, the electromagnet is energized, and a second conveyor belt cooperating with the electromagnet is provided on the worktable. A second magnet that repels the first magnet is embedded on the worktable, and a locking component is provided on the rotating ring.

[0011] Furthermore, the locking assembly includes a spring telescopic rod that is horizontally slidably mounted on the rotating ring, a third spring being installed between the spring telescopic rod and the rotating ring, and a fixing hole that cooperates with the spring telescopic rod is provided on the sealing plate.

[0012] Furthermore, a push plate is vertically slidably mounted on the rotating ring, the push plate has a vertical groove, and the bottom wall of the vertical groove has an inclined groove that cooperates with the spring telescopic rod. A straight rod that cooperates with the push plate is fixedly mounted on the top plate.

[0013] Furthermore, the piston rod includes a rod body fixedly installed on the bottom wall of the mounting plate, a connecting rod vertically slidably installed inside the rod body, and the connecting rod slidingly sealingly engaging with the mounting cylinder, and a fourth spring being installed between the connecting rod and the rod body.

[0014] Furthermore, silicone pads are uniformly fixedly installed at the bottom end of the pressing rod.

[0015] Furthermore, a roller is rotatably mounted on the side wall of the clamping plate, and the outer wall of the roller makes rolling contact with the inner wall of the drive groove.

[0016] Furthermore, an inclined plate is fixedly installed on the clamping plate, and the inclined surface of the inclined plate is a smooth mirror surface.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) This solution uses the drive groove of the vertical plate and the clamping plate to cooperate. During the pressing of the test component, the vertical plate automatically pushes the two clamping plates closer to each other. It can not only accurately push the membrane switch to the test component directly below through the inclined plate to achieve the alignment without manual adjustment, but also simultaneously clamp and fix the membrane switch. Moreover, the material can be loaded at the adjacent clamping position while testing, so that testing and loading can be carried out simultaneously, which can improve the testing efficiency.

[0018] (2) By setting a piston rod, the piston rod is driven to compress the airflow during the downward movement of the mounting plate, and the airflow drives the push rod and push plate to move through the connecting component, thereby driving the automatic push and unloading of the membrane switch after the test. No manual unloading is required, which further improves the test efficiency.

[0019] (3) This solution uses the electrical linkage between the test lamp and the electromagnet. Only when all key positions of the membrane switch are qualified will the electromagnet be energized, which will drive the sealing plate to connect the airflow path, so that qualified products are pushed to the first conveyor belt; unqualified products will be pushed to the second conveyor belt when they rotate to the position of the second conveyor belt, and will be connected to the corresponding airflow path by the repulsive force between the first magnet and the second magnet. This achieves accurate and automated screening of qualified and unqualified products. The entire process does not require manual sorting of test results, avoiding omissions and misjudgments caused by manual sorting, and further improving testing efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle; Figure 3 This is a diagram showing the combination of the worktable and the limiting component of the present invention; Figure 4 This is a cross-sectional view of the rotating ring, sealing plate, and horizontal plate of the present invention; Figure 5 This is a cross-sectional view of the rotating ring, sealing plate, and locking assembly of the present invention; Figure 6 This is a cross-sectional view of the piston rod of the present invention; Figure 7 This is a combination diagram of the straight rod, worktable, first conveyor belt and second conveyor belt of the present invention.

[0021] Explanation of the labels in the diagram: 101. Workbench; 102. Support rod; 103. Top plate; 104. Electric telescopic rod; 105. Mounting plate; 2. Limiting assembly; 201. Rotating disk; 202. Horizontal plate; 203. Clamping plate; 204. First spring; 205. Vertical plate; 206. Drive slot; 3. Test components; 301. Mounting rod; 302. Pressing plate; 303. Pressing lever; 304. Test lamp; 305. Conductive pin; 306. Mounting cylinder; 307. Piston rod; 308. Horizontal cavity; 309. Push rod; 310. Push plate; 311. First conveyor belt; 4. Connecting component; 401. Rotating ring; 402. First connecting hole; 403. Second connecting hole; 5. Screening component; 501. Blocking plate; 502. Second spring; 503. Connecting groove; 504. First magnet; 505. Linkage rod; 506. Electromagnet; 507. Second conveyor belt; 508. Second magnet; 6. Locking assembly; 601. Spring telescopic rod; 602. Third spring; 603. Fixing hole; 604. Push plate; 605. Vertical slot; 606. Angled slot; 607. Straight rod; 701. Rod body; 702. Connecting rod; 703. Fourth spring; 704. Silicone pad; 705. Roller; 706. Inclined plate. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] Please see Figures 1 to 7 A key position testing device for a membrane switch includes a workbench 101. Multiple support rods 102 are fixedly installed on the top wall of the workbench 101. A top plate 103 is fixedly installed on the top of the support rods 102. An electric telescopic rod 104 is fixedly installed on the top plate 103. An installation plate 105 is fixedly installed on the output end of the electric telescopic rod 104. A testing component 3 is provided on the installation plate 105. A limiting component 2 is provided on the workbench 101. The limiting component 2 includes a rotating disk 201 rotatably mounted on the top wall of the workbench 101. Multiple horizontal plates 202 are uniformly fixedly mounted on the rotating disk 201. Sliding grooves are symmetrically opened on the horizontal plates 202. Clamping plates 203 are slidably mounted in the sliding grooves. A first spring 204 is installed between the clamping plates 203 and the sliding grooves. A vertical plate 205 is fixedly mounted on the bottom wall of the mounting plate 105. A driving groove 206 is opened at the bottom end of the vertical plate 205. The workbench 101 is equipped with a material unloading component.

[0024] The test assembly 3 includes a mounting rod 301 fixedly mounted on the bottom wall of the mounting plate 105. A pressing plate 302 is threaded onto the mounting rod 301, and pressing rods 303 are uniformly fixedly mounted on the pressing plate 302. Test lamps 304 are uniformly fixedly mounted on the mounting plate 105, and conductive pins 305 that cooperate with membrane switches are fixedly mounted on the pressing plate 302. The unloading assembly includes a mounting cylinder 306 fixedly mounted on the workbench 101. A piston rod 307 fixedly connected to the mounting plate 105 is vertically slidably mounted inside the mounting cylinder 306, and the mounting cylinder 306 is filled with a pneumatic medium or incompressible fluid. A horizontal cavity 308 is provided on the horizontal plate 202. A push rod 309 is slidably installed in the horizontal cavity 308, and a pusher plate 310 is fixedly installed on the push rod 309. A first conveyor belt 311 that cooperates with the pusher plate 310 is provided on the worktable 101. A connecting component 4 that communicates with the horizontal cavity 308 is provided on the mounting cylinder 306. The mounting cylinder 306 is connected to the horizontal cavity 308 through the connecting component 4. While the mounting plate 105 drives the test component 3 to press down for testing, the piston rod 307 is pressure-driven to drive the medium in the mounting cylinder 306 to push the pusher plate 310 to move, so that testing and unloading are carried out simultaneously.

[0025] The communication component 4 includes a rotating ring 401 rotatably mounted on the mounting cylinder 306. The rotating ring 401 has a first communication hole 402 that communicates with the horizontal cavity 308. The mounting cylinder 306 has a second communication hole 403 that communicates with the first communication hole 402. The rotating ring 401 is provided with a screening component 5.

[0026] In use, the membrane switch can be placed between the two clamping plates 203, and then the rotating disk 201 drives the membrane switch to rotate below the pressing plate 302. At this time, the rotating disk 201 stops rotating, and the output end of the electric telescopic rod 104 extends, driving the mounting plate 105 to move downward. During the downward movement of the mounting plate 105, the pressing rod 303 is driven downward through the mounting rod 301 and the pressing plate 302. When the pressing rod 303 contacts the key position of the membrane switch, the pressing plate 302 drives the conductive pin 305 to contact the terminal of the membrane switch. At this time, if the key position is normal, the test light 304 corresponding to the key position on the mounting plate 105 will light up; if all keys are normal, all test lights 304 will light up, thus realizing the function of testing the membrane switch. At the same time, during the downward movement of the mounting plate 105, the vertical plate 205 is also driven downward. As the vertical plate 205 moves downward, the drive groove 206 on the vertical plate 205 gradually contacts the clamping plate 203 and applies a pushing force to the clamping plate 203. Under the action of the pushing force, the two clamping plates 203 move closer to each other along the slide groove. At this time, the first spring 204 is compressed and has a tendency to return to its original position. During the movement of the clamping plates 203, the membrane can be moved directly below the pressing plate 302, and the two clamping plates 203 can also clamp and fix the membrane switch together, so that the user does not need to spend time aligning and clamping the membrane switch. Furthermore, while testing, the user can place the untested membrane switch between two adjacent clamping plates 203, that is, load the switch while testing, which improves the testing efficiency.

[0027] After the test, the output end of the electric telescopic rod 104 retracts and drives the mounting plate 105 to move upward. During the upward movement of the mounting plate 105, the test assembly 3 and the vertical plate 205 move upward. As the vertical plate 205 moves upward, it gradually disengages from the clamping plate 203. At this time, the first spring 204 extends and drives the clamping plate 203 to reset, thereby releasing the clamping of the membrane switch. Then, the rotating disk 201 drives the tested membrane switch to rotate. Then, during the next test, as the mounting plate 105 moves downward, it drives the piston rod 307 downward, compressing the airflow inside the mounting cylinder 306. The airflow then flows through the second connecting hole 403 and the first connecting hole 402 into the horizontal cavity 308, pushing the push rod 309 along the horizontal cavity 308. During the movement of the push rod 309, it can drive the pusher plate 310 towards the first conveyor belt 311, pushing the tested membrane switch onto the first conveyor belt 311. Furthermore, the screening component 5 will screen membrane switches that fail the test, thus eliminating the need for users to remove the tested membrane switches and further improving testing efficiency.

[0028] like Figures 2 to 7As shown, the screening component 5 includes a linkage groove on the rotating ring 401, a blocking plate 501 slidably installed in the linkage groove, a second spring 502 installed between the blocking plate 501 and the linkage groove, a connecting groove 503 connected to the first connecting hole 402 on the blocking plate 501, a first magnet 504 embedded in the blocking plate 501, a linkage rod 505 fixedly installed on the mounting plate 105, and an electromagnet 506 embedded in the linkage rod 505 that attracts the first magnet 504, and the electromagnet 506 is electrically connected to multiple test lights 304. When multiple test lights 304 are lit simultaneously, the electromagnet 506 is energized, and a second conveyor belt 507 cooperating with the electromagnet 506 is provided on the workbench 101. A second magnet 508 repelling the first magnet 504 is embedded in the workbench 101, and a locking component 6 is provided on the rotating ring 401.

[0029] The locking assembly 6 includes a spring telescopic rod 601 that is horizontally slidably mounted on the rotating ring 401. A third spring 602 is installed between the spring telescopic rod 601 and the rotating ring 401. The sealing plate 501 has a fixing hole 603 that cooperates with the spring telescopic rod 601.

[0030] A push plate 604 is vertically slidably mounted on the rotating ring 401. A vertical groove 605 is provided on the push plate 604, and an inclined groove 606 that cooperates with the spring telescopic rod 601 is provided on the bottom wall of the vertical groove 605. A straight rod 607 that cooperates with the push plate 604 is fixedly mounted on the top plate 103.

[0031] By adopting the above technical solution, in the initial state, the sealing plate 501 is in a state of sealing the first connecting hole 402. Then, as the mounting plate 105 moves downward, it drives the electromagnet 506 to approach the first magnet 504. When testing the membrane switch, multiple test lamps 304 will only light up simultaneously when all keys of the membrane switch are qualified. Since the electromagnet 506 is connected in series with multiple test lamps 304, the electromagnet 506 is energized when multiple test lamps 304 light up simultaneously. At this time, under the action of the magnetic force of the electromagnet 506, the first magnet 504 drives the sealing plate 501 to move upward. During the upward movement of the sealing plate 501, the connecting groove 503 is connected to the first connecting hole 402, at which time the locking component 6 can lock the sealing plate 501. Then, when the rotating disk 201 drives the rotating ring 401 and the membrane switch to rotate to the direction of the first conveyor belt 311 via the horizontal plate 202, as the piston rod 307 moves downward, the airflow flows through the second connecting hole 403, the connecting groove 503, and the first connecting hole 402 to the corresponding horizontal cavity 308, and drives the qualified membrane switch to move onto the first conveyor belt 311 via the push rod 309 and the push plate 310.

[0032] When a test fails, some test lights 304 do not illuminate, and the electromagnet 506 is not energized. Then, as the rotating disk 201 drives the rotating ring 401 and the membrane switch to rotate, the defective membrane switch gradually moves to the second conveyor belt 507. During the rotation of the rotating ring 401, the corresponding sealing plate 501 of the defective membrane switch also moves to the second conveyor belt 507. At this time, as the rotating ring 401 rotates, the first magnet 504 gradually approaches the second magnet 508. The repulsive force between the first magnet 504 and the second magnet 508 increases. Under the action of this repulsive force, the first magnet 504 drives the sealing plate 501 upwards, stretching the second spring 502. Furthermore, when the sealing plate 501 moves to the second conveyor belt 508, the repulsive force between the first magnet 504 and the second magnet 508 reaches its maximum. That is, when the sealing plate 501 moves to the second conveyor belt 508, the sealing plate 501 completes its upward movement. In addition, when the first magnet 504 moves directly above the second magnet 508, the rotating disk 201 stops rotating. Then, the testing assembly 3 tests the untested membrane switch. During the upward movement of the sealing plate 501, the connecting groove 503 is connected to the first connecting hole 402. It should be noted that the magnetic field strength of the second magnet (508) is set to the repulsive force generated when the rotating ring 401 passes its position. The preload force is greater than that of the second spring (502). The sum of the frictional forces f between the sealing plate 501 and the sealing plate is, i.e. > +f ensures that the sealing plate 501 can move up to the locking position instantly. Then, as the piston rod 307 moves downward, some airflow flows through the corresponding second connecting hole 403, connecting groove 503, and first connecting hole 402 into the corresponding horizontal cavity 308, and drives the unqualified membrane switch onto the second conveyor belt 507 through the corresponding push rod 309 and push plate 310. This eliminates the need for users to screen the tested membrane switches, further improving testing efficiency.

[0033] Initially, both the third spring 602 and the spring telescopic rod 601 are compressed. As the sealing plate 501 moves upward, the fixing hole 603 gradually contacts the spring telescopic rod 601. At this time, the spring telescopic rod 601 extends and inserts into the fixing hole 603, thus fixing the sealing plate 501. Then, after the rotating ring 401 drives the sealing plate 501 past the second conveyor belt 507, the rotating ring 401 drives the push plate 604 to rotate, and the push plate 604 gradually contacts the inclined surface of the bottom wall of the straight rod 607. Then, under the action of the inclined surface of the bottom wall of the straight rod 607, the push plate 604 drives the vertical groove 605 to move downward. When the spring telescopic rod 601 contacts the vertical groove 605, the third spring 602 extends and causes the spring telescopic rod 601 to disengage from the fixing hole 603. At this time, the second spring 502 contracts and causes the sealing plate 501 to return to its original position downward. Then, after the straight rod 607 disengages from the push plate 604, the third spring 602 extends and drives the push plate 604 to move upward. During this upward movement, the push plate 604 causes the inclined groove 606 to gradually contact the spring telescopic rod 601, applying a pushing force to it. Under this pushing force, the spring telescopic rod 601 compresses the third spring 602. When the output end of the spring telescopic rod 601 contacts the side wall of the sealing plate 501, as the spring telescopic rod 601 continues to compress the third spring 602, the output end of the spring telescopic rod 601 is gradually compressed and tends to recover, thus resetting the sealing plate 501 and further improving testing efficiency.

[0034] like Figure 2 , Figure 4 , Figure 6 As shown, the piston rod 307 includes a rod body 701 fixedly installed on the bottom wall of the mounting plate 105. A connecting rod 702 is vertically slidably installed inside the rod body 701, and the connecting rod 702 is slidably sealed with the mounting cylinder 306. A fourth spring 703 is installed between the connecting rod 702 and the rod body 701.

[0035] Silicone pads 704 are evenly fixedly installed at the bottom end of the pressing rod 303.

[0036] By adopting the above technical solution, during the downward movement of the mounting plate 105, the mounting plate 105 drives the connecting rod 702 downward via the rod 701 and the fourth spring 703, and compresses the airflow in the mounting cylinder 306 through the connecting rod 702. When unqualified membrane switches occur consecutively, the connecting groove 503 on the blocking plate 501 in the direction of the first conveyor belt 311 is not connected to the first connecting hole 402, that is, the airflow can only flow to the second connecting hole 403, connecting groove 503, and first connecting groove 503 in the direction of the second conveyor belt 507, flowing towards the horizontal cavity 308. When the horizontal cavity 308 is filled with airflow, as the mounting plate 105 continues to move downward, the connecting rod 702 moves along the rod 701 and compresses the fourth spring 703, thereby ensuring that the mounting plate 105 moves downward normally for testing. Furthermore, by setting the silicone pad 704, it is possible to avoid the pressing rod 303 making hard contact with the membrane switch, which could damage the membrane switch and affect the testing efficiency.

[0037] like Figure 3 As shown, a roller 705 is rotatably mounted on the side wall of the clamping plate 203, and the outer wall of the roller 705 rolls into contact with the inner wall of the drive groove 206.

[0038] An inclined plate 706 is fixedly installed on the clamping plate 203, and the inclined surface of the inclined plate 706 is a smooth mirror surface.

[0039] By adopting the above technical solution, during the downward movement of the vertical plate 205 and the movement of the clamping plate 203 driven by the drive groove 206, the roller 705 transforms the sliding friction between the drive groove 206 and the clamping plate 203 into rolling friction between the roller 705 and the drive groove 206, thereby reducing the wear between the drive groove 206 and the clamping plate 203. Furthermore, as the two clamping plates 203 approach each other, the inclined plate 706 gradually contacts the membrane switch, and then the inclined plate 706 drives the membrane switch to move directly downwards towards the test assembly 3 via its inclined surface, effectively preventing membrane switch misalignment from affecting test efficiency. Moreover, by making the inclined surface of the inclined plate 706 a smooth mirror surface, the friction between the inclined surface of the inclined plate 706 and the membrane switch can be reduced, ensuring that the inclined plate 706 can push the membrane switch directly downwards towards the test assembly 3, further improving test efficiency.

[0040] Instructions for use: First, place the membrane switch to be tested between the two clamping plates 203 on the horizontal plate 202 of the rotating disk 201. Then, the rotating disk 201 rotates automatically, sending the membrane switch to be tested directly below the pressing plate 302. At this time, the output end of the electric telescopic rod 104 extends, driving the mounting plate 105 and the test assembly 3 to move downwards. During the downward movement of the mounting plate 105, the vertical plate 205 moves downwards synchronously, so that the drive groove 206 on the vertical plate 205 contacts the roller 705 on the clamping plate 203 and applies a pushing force. Next, the two clamping plates 203 move closer to each other along the slide groove, automatically pushing the membrane switch directly below the test assembly 3, while simultaneously completing the secure clamping of the membrane switch.

[0041] During testing, the mounting plate 105 continues to move downwards, and then the silicone pad 704 at the bottom of the pressing rod 303 contacts and presses against the membrane switch key position. At the same time, the conductive pin 305 connects with the membrane switch terminal. If the membrane switch key position is normal, the corresponding test light 304 on the mounting plate 105 lights up; when all key positions are qualified, all test lights 304 light up, completing one test.

[0042] Unloading of qualified products: When all keys of the membrane switch are qualified, all test lights 304 light up, and the electromagnet 506 connected in series with the test lights 304 is energized, generating a magnetic force to attract the first magnet 504 on the sealing plate 501, causing the sealing plate 501 to move upward, and the connecting groove 503 to connect with the first connecting hole 402 and the second connecting hole 403. Then, when the output end of the electric telescopic rod 104 extends again and drives the mounting plate 105 to move downward, the piston rod 307 squeezes the airflow in the mounting cylinder 306, and causes the airflow in the mounting cylinder 306 to flow through the second connecting hole 403, the connecting groove 503, and the first connecting hole 402 to the corresponding horizontal cavity 308, and pushes the push rod 309 and the pusher plate 310 to move, pushing the qualified membrane switch to the first conveyor belt 311.

[0043] Unloading of defective products: When a key position of the membrane switch is defective, the corresponding test light 304 will not light up, and the electromagnet 506 will not be energized. The rotating disk 201 continues to rotate, sending the defective membrane switch directly below the second conveyor belt 507. Then, when the rotating ring 401 rotates with the rotating disk 201 to the second magnet 508, the first magnet 504 and the second magnet 508 generate a repulsive force, pushing the sealing plate 501 upward, so that the connecting groove 503 connects with the connecting hole. Then, the airflow flows to the corresponding horizontal cavity 308, and the pusher plate 310 moves under the action of the airflow, pushing the defective membrane switch to the second conveyor belt 507.

[0044] After unloading, the rotating ring 401 continues to rotate, and the push plate 604 contacts the straight rod 607 on the top plate 103. The straight rod 607 pushes the push plate 604 downward, and the inclined groove 606 applies a pushing force to the spring telescopic rod 601, causing the spring telescopic rod 601 to disengage from the fixing hole 603, thus releasing the locking of the sealing plate 501. The second spring 502 retracts, driving the sealing plate 501 to return to its original position downward, closing the airflow passage.

[0045] Furthermore, when the mounting plate 105 drives the piston rod 307 to move upward, the mounting cylinder 306 draws air from the horizontal cavity 308 through the second connecting hole 403, the connecting groove 503, and the first connecting hole 402, and causes the push rod 309 to drive the push plate 310 to reset.

[0046] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A key position testing device for membrane switches, comprising a worktable (101), characterized in that: Multiple support rods (102) are fixedly installed on the top wall of the workbench (101). A top plate (103) is fixedly installed on the top of the support rods (102). An electric telescopic rod (104) is fixedly installed on the top plate (103). An installation plate (105) is fixedly installed on the output end of the electric telescopic rod (104). A test component (3) is provided on the installation plate (105). A limit component (2) is provided on the workbench (101). The limiting component (2) includes a rotating disk (201) rotatably mounted on the top wall of the workbench (101). Multiple horizontal plates (202) are uniformly fixedly mounted on the rotating disk (201). Sliding grooves are symmetrically opened on the horizontal plates (202). Clamping plates (203) are slidably installed in the sliding grooves. A first spring (204) is installed between the clamping plates (203) and the sliding grooves. A vertical plate (205) is fixedly mounted on the bottom wall of the mounting plate (105). A driving groove (206) is opened at the bottom end of the vertical plate (205). The workbench (101) is provided with a material unloading component.

2. The key position test device for a membrane switch according to claim 1, characterized by: The test assembly (3) includes a mounting rod (301) fixedly mounted on the bottom wall of the mounting plate (105), a pressing plate (302) threaded onto the mounting rod (301), and pressing rods (303) uniformly fixedly mounted on the pressing plate (302). Test lamps (304) are uniformly fixedly mounted on the mounting plate (105), and conductive pins (305) cooperating with a membrane switch are fixedly mounted on the pressing plate (302). The unloading assembly includes a mounting cylinder (306) fixedly mounted on the workbench (101), a piston rod (307) vertically slidably mounted inside the mounting cylinder (306) and fixedly connected to the mounting plate (105). The mounting cylinder (306) is filled with a pneumatic medium or incompressible fluid, including water. A horizontal cavity (308) is provided on the plate (202). A push rod (309) is slidably installed in the horizontal cavity (308), and a push plate (310) is fixedly installed on the push rod (309). A first conveyor belt (311) that cooperates with the push plate (310) is provided on the worktable (101). A connecting component (4) that communicates with the horizontal cavity (308) is provided on the mounting cylinder (306). The mounting cylinder (306) is connected to the horizontal cavity (308) through the connecting component (4). While the mounting plate (105) drives the test component (3) to press down for testing, the piston rod (307) is pressure-driven to drive the medium in the mounting cylinder (306) to push the push plate (310) to move, so that the testing and unloading are carried out simultaneously.

3. A key position testing apparatus for a membrane switch according to claim 2, characterized in that: The connecting component (4) includes a rotating ring (401) rotatably mounted on the mounting cylinder (306). The rotating ring (401) has a first connecting hole (402) communicating with the horizontal cavity (308), and the mounting cylinder (306) has a second connecting hole (403) communicating with the first connecting hole (402) evenly. The rotating ring (401) is provided with a screening component (5).

4. A key position testing apparatus for a membrane switch according to claim 3, characterized in that: The screening component (5) includes a linkage groove formed on a rotating ring (401), a sealing plate (501) slidably installed in the linkage groove, a second spring (502) being installed between the sealing plate (501) and the linkage groove, a connecting groove (503) connected to the first connecting hole (402) being formed on the sealing plate (501), a first magnet (504) being embedded in the sealing plate (501), and a linkage rod (505) being fixedly installed on the mounting plate (105), and a first magnet (504) being embedded in the linkage rod (505). An electromagnet (506) is provided that attracts the first magnet (504), and the electromagnet (506) is electrically connected to a plurality of test lamps (304). When the plurality of test lamps (304) are lit at the same time, the electromagnet (506) is energized. A second conveyor belt (507) that cooperates with the electromagnet (506) is provided on the worktable (101). A second magnet (508) that repels the first magnet (504) is embedded in the worktable (101). A locking component (6) is provided on the rotating ring (401).

5. The key position testing device for a membrane switch according to claim 4, characterized in that: The locking assembly (6) includes a spring telescopic rod (601) that is horizontally slidably mounted on a rotating ring (401). A third spring (602) is installed between the spring telescopic rod (601) and the rotating ring (401). A fixing hole (603) that cooperates with the spring telescopic rod (601) is provided on the sealing plate (501).

6. The key position testing device for a membrane switch according to claim 3, characterized in that: A push plate (604) is vertically slidably mounted on the rotating ring (401). A vertical groove (605) is provided on the push plate (604), and an inclined groove (606) that cooperates with the spring telescopic rod (601) is provided on the bottom wall of the vertical groove (605). A straight rod (607) that cooperates with the push plate (604) is fixedly mounted on the top plate (103).

7. The key position testing device for a membrane switch according to claim 3, characterized in that: The piston rod (307) includes a rod body (701) fixedly installed on the bottom wall of the mounting plate (105). A connecting rod (702) is vertically slidably installed inside the rod body (701), and the connecting rod (702) is slidably sealed with the mounting cylinder (306). A fourth spring (703) is installed between the connecting rod (702) and the rod body (701).

8. The key position testing device for a membrane switch according to claim 3, characterized in that: Silicone pads (704) are evenly fixedly installed at the bottom end of the pressing rod (303).

9. The key position testing device for a membrane switch according to claim 1, characterized in that: A roller (705) is rotatably mounted on the side wall of the clamping plate (203), and the outer wall of the roller (705) rolls into contact with the inner wall of the drive groove (206).

10. The key position testing device for a membrane switch according to claim 1, characterized in that: An inclined plate (706) is fixedly installed on the clamping plate (203), and the inclined surface of the inclined plate (706) is a smooth mirror surface.

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