Switch key pressure maintaining jig

Abstract

The utility model provides a switch button pressure maintaining jig which comprises a bottom table, supporting plates are connected to the top face of the bottom table, a cross beam is arranged on the upper side of the bottom table, the supporting plates are connected to the two ends of the cross beam, and the supporting plates support the cross beam. The beam is connected with a driving mechanism. The top surface of the bottom table is connected with a pressure maintaining device, and the driving mechanism drives the pressure maintaining device to carry out pressure maintaining on the membrane switch pasted on the circuit board. And the top surface of the bottom table is connected with a limiting device, and the limiting device limits the circuit board to be subjected to pressure maintaining. The pressure maintaining device comprises a guide rod vertically connected to the top face of the bottom table, the guide rod is slidably connected with a pressing plate, the bottom face of the pressing plate is horizontally arranged, the bottom face of the pressing plate is connected with a pressing head, the pressing plate is provided with a first threaded hole, the pressing head is connected into the first threaded hole, and the first threaded hole corresponds to a membrane switch on the circuit board. According to the utility model, the pressure head is used for applying pressure to stickers adhered to the membrane switch and the circuit board, so that uniform pressing is ensured, edge warping is avoided, and the adhesive force between the membrane switch and the circuit board is improved.

Description

Technical Field

[0001] This utility model belongs to the field of circuit board testing technology, specifically relating to a pressure-holding fixture for switch buttons. Background Technology

[0002] Membrane switches, with their excellent waterproof, dustproof, oil-proof, and corrosion-resistant properties, as well as their small size, rapid response, sensitive touch, and convenient operation, have become key components of modern electronic devices. Rigid membrane switches, in particular, are manufactured on ordinary copper-clad laminates with printed circuit boards. They offer advantages such as readily available materials, stable manufacturing processes, and low resistance. They typically use metal conductive plates as labyrinth contacts, thus providing a good tactile feel.

[0003] Rigid membrane switches typically use strong, weather-resistant double-sided tape to adhere to the marked locations on the circuit board, requiring gentle pressure with a tool to ensure a firm bond. However, due to their small size and limited adhesive area, even pressure cannot be guaranteed for rigid membrane switches, leading to edge lifting, which affects the adhesion and lifespan of the switch.

[0004] Therefore, the above problems urgently need to be solved. Utility Model Content

[0005] Purpose of the utility model: In order to overcome the above shortcomings, this utility model provides a pressure-holding fixture for switch buttons, which can ensure uniform pressing, avoid warping, improve the adhesion between the membrane switch and the circuit board, and avoid affecting the life of the membrane switch during the pressure holding process.

[0006] Technical Solution: To achieve the above objectives, this utility model provides a pressure-holding fixture for a switch button, including a base platform, a support plate connected to the top surface of the base platform, a crossbeam on the upper side of the base platform, and the support plate connected to both ends of the crossbeam, providing support for the crossbeam. A drive mechanism is connected to the crossbeam. A pressure-holding device is connected to the top surface of the base platform, and the drive mechanism drives the pressure-holding device to hold pressure on a membrane switch attached to a circuit board. A limiting device is connected to the top surface of the base platform, providing a limit to the circuit board to be pressure-held. The pressure-holding device includes a guide rod vertically connected to the top surface of the base platform, a pressure plate slidably connected to the guide rod, a horizontally positioned bottom surface of the pressure plate, a pressure head connected to the bottom surface of the pressure plate, a first threaded hole in the pressure plate, and the pressure head connected to the first threaded hole. The pressure head and the membrane switch on the circuit board are correspondingly positioned. The membrane switch is circular, and the membrane switch sticker is slightly larger than the membrane switch itself. This invention relates to a pressure-holding mechanism for membrane switches. The membrane switch is adhered to the designed position on the circuit board. The circuit board is placed on the top surface of a base platform and positioned against a limiting device. Then, a drive mechanism is activated, causing the pressure plate of the pressure-holding device to move along a guide rod towards the base platform. The pressure head presses down on the sticker adhering to the circuit board. The drive mechanism maintains this pressure for a period of time to ensure a firm adhesion of the membrane switch. Finally, the drive mechanism raises the pressure plate, allowing the operator to remove the circuit board. This invention applies pressure to the sticker adhering to the membrane switch and circuit board using the pressure head, ensuring even pressure, preventing edge lifting, and improving the adhesion between the membrane switch and the circuit board.

[0007] Furthermore, in the aforementioned pressure-holding fixture for the switch button, the pressure head is cylindrical, with an inwardly recessed arc-shaped groove at the end of the pressure head away from the pressure plate. The end connecting the pressure head and the pressure plate is a bolt with external threads. The arc-shaped groove at the end of the pressure head pressing the membrane switch avoids the membrane switch, preventing continuous pressure on the membrane switch during the pressure-holding process and thus avoiding affecting the service life of the membrane switch.

[0008] Furthermore, in the aforementioned pressure-holding fixture for switch buttons, the pressure plate is provided with a second threaded hole, which is located adjacent to the first threaded hole. By providing the second threaded hole adjacent to the first threaded hole, when pressure needs to be maintained on membrane switches on different circuit boards, the pressure head can be connected to the second threaded hole, improving the adaptability of the pressure-holding fixture.

[0009] Furthermore, in the aforementioned pressure-holding fixture for the switch button, four guide rods are provided, each connected to one of the four corners of the pressure plate. The guide rods are slidably connected to the pressure plate via bushings. The connection of the guide rods to the four corners of the pressure plate and their slidable connection to the pressure plate via bushings improves the structural stability of the pressure plate and ensures the pressure-holding effect.

[0010] Furthermore, in the aforementioned pressure-holding fixture for the switch button, a support plate is connected to the crossbeam, and the support plate is connected to the side wall of the crossbeam at a right angle. The bottom of the guide rod is connected to the base platform, and the top of the guide rod is connected to the support plate. The upper end of the guide rod is connected to the support plate, and the lower end of the guide rod is connected to the base platform, which improves the stability of the guide rod connection, ensures the accuracy of the pressure plate movement, ensures the accuracy of the pressure head position, avoids pressing deviation, and improves the pressure-holding quality.

[0011] Furthermore, in the aforementioned switch button pressure-holding fixture, the limiting device includes a first limiting mechanism and a second limiting mechanism. The first limiting mechanism is an L-shaped plate, with its long side positioned along the left and right sides of the crossbeam. The second limiting mechanism is a long strip with the same width as the first limiting mechanism, with its long side parallel to the short side of the first limiting mechanism. The first limiting mechanism, in conjunction with the second limiting mechanism, jointly limits the circuit board, increasing the number of contacts on the limiting device and the circuit board, improving positioning accuracy, and thus ensuring pressing accuracy.

[0012] Furthermore, in the aforementioned pressure-holding fixture with switch buttons, a timer, a double-headed synchronous switch, and an emergency stop button are connected to the front side of the base. The timer, double-headed synchronous switch, and emergency stop button are electrically connected to a controller located inside the base, and the drive mechanism is also electrically connected to the controller inside the base. The double-headed synchronous switch has two switches positioned on either side of the emergency stop button. When the circuit board is placed on the top surface of the base and pressure holding is required, the operator must press the double-headed synchronous switch with both hands simultaneously to activate the drive mechanism, preventing accidental contact and improving safety. When the operator presses the double-headed synchronous switch simultaneously, the controller receives a signal and controls the drive mechanism to start, simultaneously starting the timer. When the timer reaches the set time, the controller controls the drive mechanism to raise the pressure plate, ending the pressure holding process, thus automating the pressure holding process and improving production efficiency.

[0013] Furthermore, in the aforementioned pressure-holding fixture for the switch button, the driving mechanism is a cylinder with a vertically aligned cylinder shaft. A push plate is connected to the lower end of the cylinder shaft, and a pad is connected to the bottom surface of the push plate. The push plate is connected to the pressure plate through the pad. The pad improves the structural strength of the pressure plate, prevents deformation of the pressure plate which could cause uneven pressing, and avoids warping.

[0014] As can be seen from the above technical solution, this utility model has the following beneficial effects: The pressure-holding fixture for the switch button of this utility model applies pressure to the sticker adhered to the membrane switch and the circuit board through the pressure head, ensuring uniform pressing, avoiding edge lifting, and improving the adhesion between the membrane switch and the circuit board. The end of the pressure head pressing on the membrane switch is designed as an arc-shaped groove to avoid direct pressure on the membrane switch during the pressure-holding process, thus preventing any impact on the service life of the membrane switch. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the pressure-holding fixture for the switch button of this utility model;

[0016] Figure 2 This is a front view of the pressure-holding fixture for the switch button of this utility model;

[0017] Figure 3 for Figure 1 A magnified view of a portion of the image;

[0018] Figure 4 for Figure 1 A magnified view of a portion of the image;

[0019] Figure 5 This is a cross-sectional view of the pressure head.

[0020] In the diagram: 1. Base platform, 2. Support plate, 3. Crossbeam, 31. Support plate, 4. Drive mechanism, 41. Push plate, 42. Pad plate, 5. Pressure holding device, 51. Guide rod, 52. Pressure plate, 521. First threaded hole, 522. Second threaded hole, 53. Pressure head, 54. Bushing, 6. Limiting device, 61. First limiting mechanism, 62. Second limiting mechanism, 7. Timer, 8. Double-headed synchronous switch, 9. Emergency stop button. Detailed Implementation

[0021] Example 1

[0022] like Figure 1-5 The switch button pressure-holding fixture shown includes a base 1, a support plate 2 connected to the top surface of the base 1, a crossbeam 3 on the upper side of the base 1, and the support plate 2 connected to both ends of the crossbeam 3, providing support for the crossbeam 3. A drive mechanism 4 is connected to the crossbeam 3. A pressure-holding device 5 is connected to the top surface of the base 1, and the drive mechanism 4 drives the pressure-holding device 5 to hold pressure on the membrane switch attached to the circuit board. A limit device 6 is connected to the top surface of the base 1, providing a limit to the circuit board to be pressure-held. The pressure-holding device 5 includes a guide rod 51 vertically connected to the top surface of the base 1, a pressure plate 52 slidably connected to the guide rod 51, a horizontally positioned bottom surface of the pressure plate 52, a pressure head 53 connected to the bottom surface of the pressure plate 52, a first threaded hole 521 on the pressure plate 52, and the pressure head 53 connected within the first threaded hole 521. The pressure head 53 corresponds to the membrane switch on the circuit board.

[0023] In this embodiment, the pressure head 53 is cylindrical, with an inwardly recessed arc-shaped groove at the end away from the pressure plate 52. The end connecting the pressure head 53 and the pressure plate 52 is a bolt with external threads. The pressure plate 52 has a second threaded hole 522, located adjacent to the first threaded hole 521. Four guide rods 51 are provided, each connected to one of the four corners of the pressure plate 52. The guide rods 51 are slidably connected to the pressure plate 52 via bushings 54. A support plate 31 is connected to the crossbeam 3, and the support plate 31 is connected at a right angle to the side wall of the crossbeam 3. The bottom of the guide rod 51 is connected to the base platform 1, and the top of the guide rod 51 is connected to the support plate 31.

[0024] In this embodiment, the limiting device 6 includes a first limiting mechanism 61 and a second limiting mechanism 62. The first limiting mechanism 61 is an L-shaped plate, with its long side arranged along the left and right sides of the crossbeam 3. The second limiting mechanism 62 is a long strip with the same width as the first limiting mechanism 61, with its long side parallel to the short side of the first limiting mechanism 61.

[0025] In this embodiment, a timer 7, a double-headed synchronous switch 8, and an emergency stop button 9 are connected to the front side of the base 1. The timer 7, the double-headed synchronous switch 8, and the emergency stop button 9 are electrically connected to a controller installed inside the base 1, and the drive mechanism 4 is electrically connected to the controller installed inside the base 1. The double-headed synchronous switch 8 has two switches located on either side of the emergency stop button 9. In this embodiment, the drive mechanism 4 is a cylinder with a vertically mounted cylinder shaft. A push plate 41 is connected to the lower end of the cylinder shaft of the drive mechanism 4, and a pad 42 is connected to the bottom surface of the push plate 41. The push plate 41 is connected to the pressure plate 52 through the pad 42.

[0026] In this embodiment, the timer 7 is preferably a smart timer manufactured by Dongguan Saipisi Technology Co., Ltd., model SM565.

[0027] This utility model includes the following steps for maintaining pressure on a membrane switch: The membrane switch is pasted onto the designed position on the circuit board. The circuit board is placed on the top surface of the base 1 and positioned against the first limiting mechanism 61 and the second limiting mechanism 62. The operator simultaneously presses the double-headed synchronous switch 8 with both hands, activating the drive mechanism 4. Upon receiving the signal from the double-headed synchronous switch 8, the controller activates the drive mechanism 4 and simultaneously starts the timer 7. The drive mechanism 4 drives the pressure plate 52 of the pressure-maintaining device 5 to move along the guide rod 51 towards the base 1. The pressure head 53 presses down on the sticker of the membrane switch on the circuit board. The drive mechanism 4 drives the pressure head 53 to maintain this position for a period of time to ensure the membrane switch is firmly attached. When the timer 7 reaches the set time, the controller controls the drive mechanism 4 to raise the pressure plate 52, allowing the operator to remove the circuit board.

[0028] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A pressure-holding fixture for a switch button, characterized in that: Includes a base platform (1), the top surface of which is connected to a support plate (2), and a crossbeam (3) on the upper side of the base platform (1). The support plate (2) is connected to both ends of the crossbeam (3), and the support plate (2) provides support for the crossbeam (3). A drive mechanism (4) is connected to the crossbeam (3). A pressure-holding device (5) is connected to the top surface of the base platform (1), and the drive mechanism (4) drives the pressure-holding device (5) to hold pressure on the membrane switch attached to the circuit board. A limit device (6) is connected to the top surface of the base platform (1). The limiting device (6) provides a limit for the circuit board to be pressure-held; the pressure-holding device (5) includes a guide rod (51) vertically connected to the top surface of the base (1), the guide rod (51) is slidably connected to a pressure plate (52), the bottom surface of the pressure plate (52) is horizontally set, the bottom surface of the pressure plate (52) is connected to a pressure head (53), the pressure plate (52) is provided with a first threaded hole (521), the pressure head (53) is connected in the first threaded hole (521), and the pressure head (53) is correspondingly set with a membrane switch on the circuit board; The pressure head (53) is cylindrical, and the end of the pressure head (53) away from the pressure plate (52) is concave in an arc-shaped groove. The end connecting the pressure head (53) and the pressure plate (52) is a bolt with external threads.

2. The switch button pressure-holding fixture according to claim 1, characterized in that: The pressure plate (52) is provided with a second threaded hole (522), which is located adjacent to the first threaded hole (521).

3. The switch button pressure-holding fixture according to claim 1, characterized in that: The guide rod (51) is provided with 4 rods, which are respectively connected to the four corners of the pressure plate (52). The guide rod (51) is slidably connected to the pressure plate (52) through the bushing (54).

4. The switch button pressure-holding fixture according to claim 1, characterized in that: The crossbeam (3) is connected to a support plate (31), which is connected at a right angle to the side wall of the crossbeam (3); the bottom of the guide rod (51) is connected to the base (1), and the top of the guide rod (51) is connected to the support plate (31).

5. The switch button pressure-holding fixture according to claim 1, characterized in that: The limiting device (6) includes a first limiting mechanism (61) and a second limiting mechanism (62). The first limiting mechanism (61) is an L-shaped plate, with its long side arranged along the left and right sides of the crossbeam (3). The second limiting mechanism (62) is a long strip with the same width as the first limiting mechanism (61), with its long side parallel to the short side of the first limiting mechanism (61).

6. The switch button pressure-holding fixture according to claim 1, characterized in that: The front side of the base (1) is connected to a timer (7), a double-headed synchronous switch (8) and an emergency stop button (9); the timer (7), the double-headed synchronous switch (8) and the emergency stop button (9) are electrically connected to the controller set in the base (1) respectively, and the drive mechanism (4) is electrically connected to the controller set in the base (1); the double-headed synchronous switch (8) has two switches set on both sides of the emergency stop button (9).

7. The switch button pressure-holding fixture according to claim 1, characterized in that: The drive mechanism (4) is a cylinder with the cylinder shaft vertically arranged. The lower end of the cylinder shaft of the drive mechanism (4) is connected to a push plate (41). The bottom surface of the push plate (41) is connected to a pad (42). The push plate (41) is connected to the pressure plate (52) through the pad (42).

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