A membrane switch performance testing apparatus

Abstract

The utility model discloses a membrane switch performance detection equipment relates to membrane switch processing technical field, the utility model discloses a rack and shell, the both sides of shell top are all fixed with screw rod, and the bottom of shell is connected with bottom plate, and the both sides of bottom plate bottom all are penetrated with hex bolt, and the outside of hex bolt is sleeved with hand screw nut, the bottom of bottom plate is equipped with a plurality of mounting holes, and a plurality of mounting holes are placed with the pressing rod inside. The utility model discloses the setting of shell, bottom plate, pressing rod and mounting hole, the distribution form of a plurality of mounting holes that are equipped on the bottom plate corresponds the button position of specific model membrane switch, when needing to detect different model membrane switch, need not integral replacement press structure, only need to replace the bottom plate with the distribution form of corresponding mounting hole, and the pressing rod can be stably assembled on the new bottom plate through the mounting hole, effectively reduce the demand of integral replacement press structure, only need to store and distribute the bottom plate of different mounting hole layout, reduce the cost and space of spare parts reserve.

Description

Technical Field

[0001] This utility model relates to the field of membrane switch processing technology, specifically to a membrane switch performance testing device. Background Technology

[0002] A membrane switch is a thin and lightweight electronic switch that integrates button functionality and circuit conduction. It is typically composed of multiple layers, including a panel layer, a conductive layer, an insulating layer, and a substrate layer. It is characterized by its small size, light weight, sensitive operation response, and resistance to environmental interference (such as dust and moisture resistance). It is widely used in home appliance control panels, industrial control instruments, medical devices, and automotive electronic equipment, and is one of the core components for realizing human-computer interaction.

[0003] Before leaving the factory, membrane switches must undergo performance testing to ensure their reliability. The core testing objectives are the button's conductivity, pressing life, and operational stability. During the testing process, real-world usage scenarios are simulated. The pressing component is driven by pneumatic, electric, or hydraulic mechanisms, subjecting the membrane switch button to tens of thousands of reciprocating pressing operations. Simultaneously, a power-on testing module monitors the circuit continuity in real time during button pressing to determine if there are any problems such as poor contact, conduction failure, abnormal pressing stroke, or mechanical damage to the button, in order to screen out products that meet quality standards.

[0004] The pressing structure of membrane switch performance testing equipment is mostly a fixed type bound to a specific switch model, i.e., a customized product. It can only be used for testing a few models of membrane switches. When changing models of the fixed structure, the entire pressing assembly needs to be disassembled and replaced. The operation is cumbersome and a large number of spare parts of different models need to be stocked, which is costly. Utility Model Content

[0005] Therefore, the purpose of this utility model is to provide a membrane switch performance testing device to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a membrane switch performance testing device, comprising a frame and a housing, wherein screws are fixed on both sides of the top of the housing, and a base plate is connected to the bottom of the housing, and hexagonal bolts are passed through both sides of the bottom of the base plate, and hand-tightening nuts are sleeved on the outside of the hexagonal bolts; multiple mounting holes are opened on the bottom of the base plate, and pressure rods are placed inside the multiple mounting holes, buffer sleeves are connected to the outside of the pressure rods, and buffer pads are connected to the bottom ends of the pressure rods.

[0007] By adopting the above technical solution, the outer shell serves as the supporting foundation for all core pressing components, and the screw on its top can be directly connected to the actuator to obtain pressing power; the base plate cooperates with the pressure rod through the mounting holes, so that the pressure rod can accurately correspond to the button position of the membrane switch. At the same time, the buffer sleeve and buffer pad reduce damage during the pressing process from two dimensions: protection of equipment components and protection of membrane switches, respectively, laying a stable structural foundation for subsequent efficient testing and rapid model switching.

[0008] Furthermore, a workbench and a main body of the equipment are respectively installed on the top of the frame, and a touch screen is installed on the outer surface of the main body of the equipment. A cylinder is installed inside the main body of the equipment, and the bottom end of the cylinder extends through the lower part of the main body of the equipment to the bottom of the main body of the equipment.

[0009] By adopting the above technical solution, the frame supports the workbench and the main body of the equipment, ensuring the overall stability of the equipment during operation; the cylinder inside the main body of the equipment serves as the driving source for the pressing structure, and its bottom end extends to the outside of the main body and can be directly connected to the outer shell to realize the direct transmission of power; the touch screen provides the staff with a visual operating interface and allows them to view the on / off status.

[0010] Furthermore, the outer surface of the workbench is provided with multiple T-slots, and T-bolts are placed inside the T-slots, with pressure plates connected to the outer surface of the T-bolts.

[0011] By adopting the above technical solution, the staff can flexibly adjust the position of the T-bolt in the T-slot according to the size and shape of the positioning fixture, so that the pressure plate can accurately fit the edge of the fixture; after tightening the T-bolt, the pressure plate can form a stable clamping force on the fixture, avoiding the deviation of the pressure rod pressing position caused by the fixture offset during the inspection process, thereby ensuring the inspection accuracy and reducing the inspection error caused by the loosening of the fixture.

[0012] Furthermore, the housing is detachably connected to the output end of the cylinder via a screw and double nuts.

[0013] By adopting the above technical solution, the locking structure of the double nuts can ensure that the housing does not loosen when it moves with the cylinder piston rod, ensuring the stability of power transmission and preventing the housing from falling off during the pressing process. When the housing or cylinder is damaged, the screw can be disassembled simply by loosening the double nuts, so that the housing and cylinder can be replaced separately without replacing the actuator or pressing structure as a whole, which greatly reduces maintenance costs and maintenance time.

[0014] Furthermore, the base plate is detachably connected to the outer casing via hexagonal bolts and hand-tightened nuts, and the pressure rod is detachably connected to the mounting hole.

[0015] By adopting the above technical solution, it is convenient and quick to replace bottom plates with different mounting hole distributions to adapt to membrane switches of different models; the detachable connection between the pressing rod and the mounting hole facilitates independent maintenance or replacement of the pressing rod. When the pressing rod is worn, it can be directly taken out from the mounting hole for replacement, which further improves the maintenance flexibility of the equipment.

[0016] Further, the longitudinal section of the pressing rod is T-shaped, the diameter of the top end of the pressing rod is larger than that of the mounting hole, and the diameter of the bottom end of the pressing rod is smaller than that of the mounting hole.

[0017] By adopting the above technical solution, since the diameter of the bottom end of the pressing rod is smaller than that of the mounting hole, workers can easily pass the pressing rod through the bottom plate from top to bottom to complete assembly; the design that the diameter of the top end is larger than that of the mounting hole enables the top end of the pressing rod to be clamped inside the housing to form natural limitation after the bottom plate is installed at the bottom of the housing, which effectively reduces the risk of the pressing rod falling off from the mounting hole during reciprocating pressing, and ensures the continuity of the detection process.

[0018] Further, both the cushion pad and the buffer sleeve are made of silicone rubber material, and the housing, the bottom plate and the pressing rod are all made of aluminum alloy material.

[0019] By adopting the above technical solution, silicone rubber has good elasticity and buffer performance, which enables the cushion pad to effectively disperse pressure during pressing and reduce the probability of scratching on keys of the membrane switch. Meanwhile, the buffer sleeve can reduce collision damage to the pressing rod, the housing and the bottom plate. The aluminum alloy material has both the advantages of light weight and high strength, which can not only reduce the driving load of the air cylinder and lower energy consumption, but also ensure the structural strength of the housing, the bottom plate and the pressing rod, reduce deformation or fracture of components, and prolong the overall service life of the equipment.

[0020] Further, an embedded rod penetrates through the top of the cushion pad, the embedded rod is fixedly connected with the cushion pad by means of metal insert injection, and the embedded rod is in threaded connection with the pressing rod.

[0021] By adopting the above technical solution, the embedded rod is fixed with the cushion pad by means of metal insert injection, which can greatly enhance the connection strength between the two and prevent the cushion pad from separating from the embedded rod after long-term use; the threaded connection structure between the embedded rod and the pressing rod allows workers to drive the embedded rod to screw into or out of the pressing rod only by rotating the cushion pad, so that the replacement of the cushion pad can be completed quickly without disassembling the whole pressing rod, which improves the maintenance efficiency of wearing parts.

[0022] Further, the longitudinal section of the embedded rod is in an "soil" (Chinese character shaped like a upside-down T-shape) shape.

[0023] By adopting the above technical solution, the T-shaped structure can increase the contact area between the insert rod and the buffer pad, making the connection between the insert rod and the buffer pad tighter and stronger during the injection molding of the metal insert; it can effectively reduce the risk of the insert rod coming out of the buffer pad when the buffer pad is pressed, ensuring that the buffer pad can always play a stable protective role and avoiding damage to the button due to the insert rod falling off.

[0024] Furthermore, the buffer sleeve has an "n"-shaped longitudinal section, and the buffer sleeve is detachably connected to the pressure rod.

[0025] By adopting the above technical solution, the n-shaped longitudinal section structure can better wrap the pressure rod, tightly fill the gap between the pressure rod and the mounting hole and the outer shell, improve the buffering effect on the axial movement of the pressure rod, and reduce collision damage. The design of the detachable connection between the buffer sleeve and the pressure rod allows the staff to remove it without the need for tools. They can simply fold the buffer sleeve outwards and put it directly on the outside of the pressure rod when installing it for the new one, which greatly simplifies the maintenance and replacement process of the buffer sleeve.

[0026] In summary, the present invention has the following main advantages: 1. This utility model, through the design of the outer shell, base plate, pressure rod, and mounting holes, features a base plate with multiple mounting holes distributed in a manner corresponding to the button positions of specific membrane switch models. When testing different models of membrane switches, it is not necessary to replace the entire pressing structure; only the base plate with the corresponding mounting hole distribution needs to be replaced. The pressure rod can be stably mounted on the new base plate through the mounting holes, and the design of the pressure rod's top diameter being larger than the mounting hole diameter ensures that it is not easily detached after assembly. This effectively reduces the need for replacing the entire pressing structure, requiring only the storage of base plates with different mounting hole layouts, thus reducing spare parts storage costs and space requirements. 2. This utility model uses a shell, a base plate, hexagonal bolts, and a hand-tightening nut. The hexagonal bolts penetrate the base plate and the shell to achieve initial fixation. Then, the worker can manually tighten the nut to lock it in place, thus completing the disassembly and installation of the base plate. This facilitates the disassembly and assembly of the base plate. 3. This utility model incorporates a buffer pad and a buffer sleeve. The buffer pad, connected to the bottom of the pressure rod, provides contact cushioning when the pressure rod presses the membrane switch button, reducing the probability of the button surface being scratched due to direct rigid contact. The buffer sleeve, fitted over the pressure rod, fills the gap between the pressure rod and the base plate and outer casing, providing a buffering effect and reducing the likelihood of the pressure rod colliding with the inner wall of the outer casing or the top of the base plate due to assembly gaps, machining precision gaps, etc., thus extending the service life of the equipment components. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the outer shell structure of this utility model; Figure 3 This is a bottom view of the outer shell structure of this utility model; Figure 4 This is a schematic diagram of the cross-sectional structure of the outer shell of this utility model; Figure 5 This is a schematic diagram of the exploded shell structure of this utility model; Figure 6 This is a schematic diagram of the cross-sectional structure of the compression bar of this utility model.

[0028] In the diagram: 1. Frame; 2. Workbench; 3. Main body of equipment; 4. Touch screen; 5. Cylinder; 6. T-slot; 7. T-bolt; 8. Pressure plate; 9. Outer shell; 10. Screw; 11. Base plate; 12. Hex bolt; 13. Hand-tightening nut; 14. Pressure rod; 15. Buffer pad; 16. Buffer sleeve; 17. Mounting hole; 18. Insert rod. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] The embodiments of this utility model will be described below based on its overall structure.

[0031] Example 1: A membrane switch performance testing device, such as Figures 1-6As shown, the device includes a frame 1 and a housing 9. Screws 10 are fixed to both sides of the top of the housing 9. The housing 9 is detachably connected to the output end of the cylinder 5 via the screws 10 and double nuts. The operator connects the housing 9 to the output end of the cylinder 5 via the screws 10 on both sides of the top, and uses the double nuts to lock and limit the screws 10, allowing the housing 9 to move synchronously with the extension and retraction of the piston rod of the cylinder 5, ensuring the stability of power transmission. A base plate 11 is connected to the bottom of the housing 9. Hexagonal bolts 12 penetrate both sides of the bottom of the base plate 11. The base plate 11 is externally fitted with a hand-tightening nut 13. The base plate 11 is detachably connected to the outer casing 9 via hex bolts 12 and the hand-tightening nut 13. The operator attaches the base plate 11 to the bottom of the outer casing 9, inserts the hex bolts 12 through both sides of the bottom of the base plate 11 into the pre-set connection holes in the outer casing 9, and manually tightens the hand-tightening nut 13 to complete the assembly and positioning of the base plate 11 and the outer casing 9. The bottom of the base plate 11 has multiple mounting holes 17, and pressure rods 14 are placed inside these mounting holes 17. The longitudinal section is T-shaped. The diameter of the top end of the pressure rod 14 is larger than the diameter of the mounting hole 17, while the diameter of the bottom end of the pressure rod 14 is smaller than the diameter of the mounting hole 17. The pressure rod 14 is detached from the mounting hole 17. The operator inserts the pressure rod 14 into the mounting hole 17 from top to bottom, so that the subsequent pressure rod 14 can correspond to the button position of the membrane switch. Because the longitudinal section of the pressure rod 14 is T-shaped and the diameter of the top end is larger than the diameter of the mounting hole 17, the top end of the pressure rod 14 is stably placed on the top of the base plate 11 to form a limit, reducing the pressure rod 14 from exiting the mounting hole 17. To mitigate the risk of detachment, a buffer sleeve 16 is connected to the outside of the pressure rod 14. The buffer sleeve 16 fills the gap between the pressure rod 14 and the top of the base plate 11 and the upper part of the inner shell 9, and acts as a buffer. When the shell 9, the base plate 11 and the pressure rod 14 move up and down synchronously, it can prevent the axial movement of the pressure rod 14 from colliding with the inner wall of the shell 9 and the top of the base plate 11, thus reducing component wear. A buffer pad 15 is connected to the bottom of the pressure rod 14. The buffer pad 15 can reduce the direct rigid contact between the pressure rod 14 and the button, reducing the probability of the button surface being scratched.

[0032] See Figure 1, in the above embodiments, a workbench 2 and an equipment main body 3 are respectively installed on the top of a frame 1, a touch screen 4 is installed on the outer surface of the equipment main body 3, and an air cylinder 5 is installed inside the equipment main body 3. The bottom end of the air cylinder 5 penetrates through the lower part inside the equipment main body 3 and extends to the bottom of the equipment main body 3. A worker starts the air cylinder 5 through the touch screen 4, and a piston rod at the output end of the air cylinder 5 drives an outer housing 9, a bottom plate 11 and a pressure rod 14 to synchronously perform up-and-down reciprocating motion. A buffer pad 15 at the bottom end of the pressure rod 14 contacts with a membrane switch key and applies pressing force, so as to simulate key operation in an actual use scenario; at the same time, in cooperation with a power-on test module built in a positioning tool, the conduction state of a circuit is monitored in real time while the pressure rod 14 presses the key, so as to judge whether the key has problems such as poor contact, conduction failure and the like, and complete performance detection; a plurality of T-shaped grooves 6 are formed on the outer surface of the workbench 2, T-shaped bolts 7 are placed inside the T-shaped grooves 6, and a pressure plate 8 is connected to the outer surfaces of the T-shaped bolts 7. A worker places the positioning tool matching the model of the membrane switch to be detected on the workbench 2 at the top of the frame 1, adjusts the positions of the T-shaped bolts 7 in the T-shaped grooves 6 on the outer surface of the workbench 2 according to the size of the tool, so that the T-shaped bolts 7 drive the pressure plate 8 to move to the edge of the tool, and the worker tightens the T-shaped bolts 7 to enable the pressure plate 8 to compress the tool, so as to ensure that the tool is stable and does not deviate during detection.

[0033] Example 2: Based on the above Example 1, the following arrangement is adopted to improve practicability.

[0034] Refer to Figures 1-6 , in the above embodiments, both the buffer pad 15 and the buffer sleeve 16 are made of silicone rubber material. The silicone rubber has good soft elasticity, can effectively disperse pressure and provide protection, and reduces damage to the pressure rod 14. The outer housing 9, the bottom plate 11 and the pressure rod 14 are all made of aluminum alloy material, which realizes light weight to reduce load and has high structural strength.

[0035] Example 3: Based on the above Example 1, the following arrangement is adopted to facilitate replacement of the buffer sleeve.

[0036] Refer to Figure 4 and Figure 6 , in the above embodiments, an embedded rod 18 penetrates through the top of the buffer pad 15, the longitudinal section of the embedded rod 18 is in a "soil" shape, the embedded rod 18 is fixedly connected with the buffer pad 15 by means of metal insert injection, and the embedded rod 18 is in threaded connection with the pressure rod 14; the longitudinal section of the buffer sleeve 16 is in an "n" shape, and the buffer sleeve 16 is detachably connected with the pressure rod 14.

[0037] The implementation principle of this utility model is as follows: First, before testing, the tooling is positioned and the equipment is debugged. The operator places the positioning tooling that matches the model of the membrane switch to be tested on the workbench 2 at the top of the frame 1. The position of the T-bolt 7 in the T-groove 6 on the outer surface of the workbench 2 is adjusted according to the tooling size, so that the T-bolt 7 drives the pressure plate 8 to move to the edge of the tooling. The operator tightens the T-bolt 7 to make the pressure plate 8 press the tooling, ensuring that the tooling is stable and does not shift during the testing process. At the same time, the operator connects the power supply test module on the tooling, which is used to power the membrane switch, to the main body of the equipment 3 through a cable. Next, the connection between the pressing structure and the actuator is completed. The staff connects the outer shell 9 to the output end of the cylinder 5 through the screws 10 on both sides of the top. The screws 10 are locked and limited by double nuts so that the outer shell 9 can move synchronously with the extension and retraction of the piston rod of the cylinder 5, ensuring the stability of power transmission and preventing the outer shell 9 from separating from the cylinder 5 during the pressing process, which would cause the detection to be interrupted. Subsequently, based on the button positions of the membrane switch to be tested, the staff selected a base plate 11 with corresponding mounting holes 17. The staff inserted the pressure rod 14 from top to bottom into the mounting holes 17, ensuring that the pressure rod 14 corresponded to the button positions of the membrane switch. Because the longitudinal section of the pressure rod 14 is T-shaped and its top diameter is larger than the diameter of the mounting hole 17, the top of the pressure rod 14 is stably placed on top of the base plate 11, forming a limit and reducing the risk of the pressure rod 14 falling off the mounting hole 17. Afterwards, the staff attached the base plate 11 to the bottom of the outer casing 9 and used hexagonal bolts 12 to penetrate the base plate 11 from both sides of the bottom. 11 is inserted into the pre-set connection hole of the outer shell 9. The operator completes the assembly and positioning of the base plate 11 and the outer shell 9 by manually tightening the hand-tightening nut 13. At the same time, the buffer sleeve 16 fills the gap between the pressure rod 14 and the top of the base plate 11 and the upper interior of the outer shell 9 and plays a buffering role. When the outer shell 9, the base plate 11 and the pressure rod 14 move up and down synchronously, it can prevent the axial movement of the pressure rod 14 from colliding with the inner wall of the outer shell 9 and the top of the base plate 11, reducing component wear. Moreover, the outer shell 9, the base plate 11 and the pressure rod 14 are made of aluminum alloy material, which achieves overall lightweight while ensuring structural strength and reducing the drive load of the cylinder 5. After preparation, the staff starts the cylinder 5 via the touch screen 4. The piston rod at the output end of the cylinder 5 drives the outer shell 9, the base plate 11, and the pressure rod 14 to move up and down in a synchronized manner. The buffer pad 15 at the bottom of the pressure rod 14 contacts the membrane switch button and applies pressure, simulating the button operation in a real-world scenario. During this process, the buffer pad 15 reduces the direct rigid contact between the pressure rod 14 and the button, lowering the probability of the button surface being scratched. At the same time, in conjunction with the power-on test module built into the positioning fixture, the circuit continuity status is monitored in real time while the pressure rod 14 presses the button, determining whether there are problems such as poor contact or continuity failure, thus completing the performance test. When the buffer pad 15 wears out due to long-term use, rotate the buffer pad 15 to drive the insert rod 18 to be unscrewed from the bottom of the pressure rod 14. After replacing the buffer pad 15, tighten the insert rod 18 again. If the buffer sleeve 16 is aged or damaged, fold the buffer sleeve 16 outward to remove it from the pressure rod 14. The new buffer sleeve 16 can be directly fitted onto the outside of the pressure rod 14 to complete the replacement, ensuring the convenience of subsequent equipment maintenance and extending the overall service life.

[0038] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A membrane switch performance testing device, comprising a frame (1) and a housing (9), characterized in that: Screw rods (10) are fixedly arranged on both sides of the top of the outer casing (9), a bottom plate (11) is connected to the bottom of the outer casing (9), hexagon bolts (12) penetrate through both sides of the bottom of the bottom plate (11), and hand-tightened nuts (13) are sleeved outside the hexagon bolts (12); a plurality of mounting holes (17) are formed in the bottom of the bottom plate (11), pressure rods (14) are arranged inside the plurality of mounting holes (17), a buffer sleeve (16) is connected outside the pressure rod (14), and a buffer pad (15) is connected to the bottom end of the pressure rod (14).

2. The membrane switch performance testing equipment according to claim 1, characterized in that: A workbench (2) and an equipment main body (3) are respectively installed on the top of the frame (1), a touch screen (4) is installed on the outer surface of the equipment main body (3), an air cylinder (5) is installed inside the equipment main body (3), and the bottom end of the air cylinder (5) penetrates through the lower part inside the equipment main body (3) and extends to the bottom of the equipment main body (3).

3. The membrane switch performance testing equipment according to claim 2, characterized in that: A plurality of T-shaped grooves (6) are formed on the outer surface of the workbench (2), T-shaped bolts (7) are arranged inside the T-shaped grooves (6), and a pressure plate (8) is connected to the outer surface of the T-shaped bolts (7).

4. The membrane switch performance testing equipment according to claim 2, characterized in that: The outer casing (9) is detachably connected with the output end of the air cylinder (5) through the screw rods (10) and double nuts.

5. The membrane switch performance testing equipment according to claim 4, characterized in that: The bottom plate (11) is detachably connected with the outer casing (9) through the hexagon bolts (12) and the hand-tightened nuts (13), and the pressure rods (14) are detachably connected with the mounting holes (17).

6. The membrane switch performance testing equipment according to claim 5, characterized in that: The longitudinal section of the pressure rod (14) is T-shaped, the diameter of the top end of the pressure rod (14) is larger than that of the mounting hole (17), and the diameter of the bottom end of the pressure rod (14) is smaller than that of the mounting hole (17).

7. The membrane switch performance testing equipment according to claim 1, characterized in that: Both the buffer pad (15) and the buffer sleeve (16) are made of silicone rubber, and the outer casing (9), the bottom plate (11) and the pressure rods (14) are all made of aluminum alloy.

8. The membrane switch performance testing equipment according to claim 7, characterized in that: An embedded rod (18) penetrates through the top of the buffer pad (15), the embedded rod (18) is fixedly connected with the buffer pad (15) by means of metal insert injection molding, and the embedded rod (18) is in threaded connection with the pressure rod (14).

9. The membrane switch performance testing equipment according to claim 8, characterized in that: The longitudinal section of the embedded rod (18) is in an inverted "soil" shape.

10. The membrane switch performance testing equipment according to claim 7, characterized in that: The longitudinal section of the buffer sleeve (16) is n-shaped, and the buffer sleeve (16) is detachably connected with the pressure rod (14).

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