Tool for detecting ejection length of mandrel

Abstract

The utility model provides a mandrel ejection length detection tool comprising a base plate, one end of the base plate is provided with a positioning block, the front side surface of the positioning block is provided with a detection through hole, the positioning block is provided with a micrometer, and a micrometric screw at the front end of the micrometer is located in the detection through hole; an elastic sliding mechanism is arranged at the other end of the bottom plate, an insulating block is arranged on the side, close to the positioning block, of the elastic sliding mechanism, two opening grooves are formed in the side, close to the positioning block, of the insulating block, spring needles are arranged in the two opening grooves correspondingly, and needle heads of the spring needles face the side, close to the positioning block, of the insulating block; needle tubes of the spring needles are electrically connected to an audible and visual alarm through wires respectively. According to the mandrel ejection length detection tool, elastic fixation of the mini switch can be realized, the micrometer is used for pushing the mandrel to eject the leaf spring so as to disconnect the inner end of the mini switch, and whether the internal leaf spring deforms or not is judged through the ejection length of the mandrel.

Description

A mandrel opening length detection fixture Technical Field

[0001] This utility model belongs to the technical field of pressure switches, specifically relating to a tooling for detecting the opening length of a mandrel. Background Technology

[0002] Pressure switches can be applied in fields such as industrial automation, automotive manufacturing, home appliances, and refrigeration systems. In industrial automation, they are widely used for liquid level control and air pressure monitoring. For example, in the control of equipment such as compressors and pumps, pressure switches can automatically cut off power, protecting the equipment and ensuring safe operation.

[0003] As shown in Figure 3, the pressure switch is an automatically reset switch. Its structure includes a housing containing a stationary spring plate 100 and a movable spring plate 200. The stationary and movable spring plates extend out of the housing to form two wiring pins. At the other end of the housing, away from the two wiring pins, is a sealing cover plate 300. A spindle 400 is movably inserted through the center of the sealing cover plate. The inner end of the spindle corresponds to a leaf spring 500 connected to the inner end of the movable spring plate. Currently, the leaf spring is in contact with the inner end of the stationary spring plate (normally closed). Under the action of the spindle, it can separate from the inner end of the stationary spring plate, thus disconnecting the circuit. The leaf spring is a biased elliptical ring that is movable and conductive.

[0004] Currently, the opening distance of miniature switches is fixed, meaning the length of the spindle is constant. However, during production, it has been found that sometimes the spindle length meets the requirements, and the spindle opens a certain distance without disconnecting the circuit. This is mainly caused by deformation of the leaf spring, but the slight deformation of the leaf spring is difficult to observe with the naked eye. Therefore, a testing fixture is needed, using a standard spindle, to inspect the assembled leaf spring and determine whether the internal leaf spring is deformed based on the opening distance. Summary of the Invention

[0005] This utility model provides a mandrel opening length detection fixture, which determines whether the internal leaf spring is deformed by the mandrel opening length.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A mandrel opening length detection fixture includes a base plate. A positioning block is provided at one end of the base plate. A detection through hole is provided on the front side of the positioning block. A micrometer is provided on the positioning block, and the micrometer's front end micrometer screw is located in the detection through hole. An elastic sliding mechanism is provided at the other end of the base plate. An insulating block is provided on the side of the elastic sliding mechanism near the positioning block. Two opening slots are provided on the side of the insulating block near the positioning block. Spring needles are respectively provided in the two opening slots, and the needle tips of the spring needles face the positioning block. The needle tubes of the spring needles are electrically connected to an audible and visual alarm through wires.

[0008] Preferably, a positioning protrusion is provided on the outer side of the detection through hole.

[0009] Preferably, the top and rear sides of the opening groove are open, and the spring pin is fixed in the opening groove with glue.

[0010] Preferably, the elastic sliding mechanism includes a concave guide block and a fixed plate. The concave guide block is disposed on the base plate, and a slide rod is movably inserted through the center of the concave guide block along the length of the base plate. The fixed plate is disposed at the other end of the slide rod and can move with the slide rod. The insulating block is disposed on the side of the fixed plate near the positioning block. A limit nut is provided on the slide rod located in front of the concave guide block, and a spring is sleeved on the slide rod located between the concave guide block and the fixed plate.

[0011] Preferably, two guide rods are movably inserted into the concave guide block along the length of the base plate, and the two guide rods are located on both sides of the slide rod. The other end of the guide rod is set on the fixed plate, and the guide rod moves with the fixed plate.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This spindle opening length detection fixture can achieve elastic fixation of the mini switch, and push the spindle to open the leaf spring by a micrometer to disconnect the inner end of the mini switch. The opening length of the spindle can be used to determine whether the internal leaf spring is deformed. It is also equipped with an audible and visual alarm to remind you of the disconnection, which is more intuitive and convenient. Attached Figure Description

[0013] Figure 1 is a schematic diagram of the structure of this utility model.

[0014] Figure 2 is a partial cross-sectional view of the insulating block.

[0015] Figure 3 is a simplified structural diagram of a miniature switch.

[0016] In the diagram: 1. Base plate; 2. Positioning block; 3. Micrometer; 4. Insulating block; 5. Spring pin; 6. Audible and visual alarm; 7. Concave guide block; 8. Fixing plate; 9. Slide rod; 10. Limit nut; 11. Spring; 12. Guide rod; 13. Detection through hole; 14. Positioning protrusion ring; 15. Opening groove; 16. Indicator light. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described below in conjunction with specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art.

[0018] This utility model provides a tooling for detecting the opening length of a mandrel, including a base plate 1, a positioning block 2 at one end of the base plate, a detection through hole 13 on the front side of the positioning block, a micrometer 3 on the positioning block, and the micrometer screw at the front end of the micrometer 3 located in the detection through hole 13; an elastic sliding mechanism is provided at the other end of the base plate 1, which is close to the positioning block in its natural state and can be moved away from the positioning block under force; an insulating block 4 is provided on the side of the elastic sliding mechanism near the positioning block, the insulating block is made of insulating material and is non-conductive, and two opening slots 15 are opened on the side of the insulating block 4 near the positioning block 2, and spring needles 5 are respectively provided in the two opening slots 15, with the needle tips of the spring needles 5 facing the positioning block 2 side, and the needle tubes of the spring needles 5 are electrically connected to an audible and visual alarm 6 through wires. The distance between the spring needle tip and the opening end of the opening slot should be less than the length of the wiring pin of the miniature switch.

[0019] The positioning block consists of a detachable upper positioning block and a lower positioning block. This design is mainly to take into account the fixing and disassembly of the micrometer. The back side of the inspection through hole is connected to a fixing through hole that is adapted to the fixing part of the micrometer. Both the inspection through hole and the fixing through hole are composed of the semi-circular through holes of the upper and lower positioning blocks.

[0020] Spring-loaded pins, also known as spring-loaded terminals, are precision connectors used in electronic products such as mobile phones. They consist of three basic components: a pin tip, a pin tube, and a spring, riveted together using precision instruments. The internal spring allows for flexible extension and retraction, and they are frequently used in vibrating environments. In this application, they primarily reduce the stress on the pins of miniature switches. The pin tube end is electrically connected to the audible and visual alarm via a wire, and the pin tip makes contact with the pins of the miniature switch to establish electrical continuity.

[0021] The audible and visual alarm is a standard product. Only one configuration is described here. The alarm contains a buzzer, indicator light 16, and a power module. The power module is powered by a battery. One end of the power module is connected to a spring pin via a wire, and the other end is connected to the buzzer and indicator light via a wire. The other ends of the buzzer and indicator light are connected to another spring pin via wires. Without the mini-switch inserted, the circuit is open because the two spring pins are not in contact. When the mini-switch is inserted but not activated, the circuit is closed because the mini-switch is in the closed state, and the two terminals are in contact with the two spring pins, thus completing the circuit. The indicator light illuminates, and the buzzer vibrates.

[0022] In use, first push the elastic sliding mechanism to move the insulating block away from the positioning block, then place the sealing cover of the mini switch over the detection through hole. At this time, the spindle on the mini switch is in contact with the micrometer screw of the micrometer, but is not under force. Release the elastic sliding mechanism to return it to its original position. The spring needles in the two slots of the insulating block can then precisely press against the wiring pins of the mini switch. Since the inner end of the mini switch is in a closed state, the circuit is connected, the indicator light of the audible and visual alarm lights up, and the buzzer vibrates. Then, adjust the micrometer so that the micrometer screw at its front end extends forward, pushing the spindle forward, which in turn pushes the leaf spring to separate it from the inner end of the stationary spring, breaking the circuit. The indicator light goes out, and the buzzer stops vibrating. At this time, stop adjusting the micrometer and check the reading. If the spindle opening length is within the required range, the internal leaf spring meets the requirements. If it is not within the range, the internal leaf spring does not meet the requirements and must be removed and replaced. The zeroing calibration of the micrometer is a standard technique, usually achieved with other external tools, and will not be described in detail.

[0023] Furthermore, since the sealing cover of the mini switch has a circular groove on the side that connects with the detection through hole, a positioning protrusion ring 14 is provided on the outer side of the detection through hole in order to achieve rapid positioning. The circular groove of the sealing cover of the mini switch can fit exactly on the positioning protrusion ring, and its spindle is located in the center of the positioning protrusion ring.

[0024] Furthermore, the top and rear sides of the opening groove 15 are open, and the bottom surface of the opening groove 15 is provided with a groove that is compatible with the needle tube for quick placement and positioning. The spring needle 5 is fixed in the opening groove 15 with glue, and the glue fills the opening groove, submerging the rear half of the needle tube of the spring needle.

[0025] In this embodiment, the elastic sliding mechanism includes a concave guide block 7 and a fixing plate 8. The concave guide block 8 is disposed on the base plate, and a sliding rod 9 is movably inserted through the center of the concave guide block 8 along the length of the base plate. The fixing plate 8 is disposed at the other end of the sliding rod 9 and can move with the sliding rod 9. The fixing block can contact the base plate. The insulating block 4 is disposed on the side of the fixing plate near the positioning block and does not contact the base plate. A limit nut 10 is provided on the sliding rod 9 located in front of the concave guide block 7, and a spring 11 is sleeved on the sliding rod 9 located between the concave guide block 7 and the fixing plate 8. When not in operation, the spring naturally extends, and the insulating block is close to the positioning block. The distance between the two is less than the overall height of the mini switch. Therefore, after the mini switch is placed, it can press against the wiring pins of the mini switch to fix it in place.

[0026] For aesthetic purposes, a wire fixing seat is arranged on the concave guide block. The wire led out from the end of the spring needle tube passes through the through hole at the top of the fixing plate, is fixed together by the Velcro of the wire fixing seat, and is then led to the sound and light alarm.

[0027] To ensure the accuracy of movement, two guide rods 12 are movably inserted inside the concave guide block along the length of the base plate, and the two guide rods 12 are located on both sides of the slide rod 9. The other end of the guide rod 12 is set on the fixed plate 8, and the guide rods move with the fixed plate when it moves.

Claims

1. A mandrel top opening length detection tool, characterized by: The device includes a base plate, one end of which is provided with a positioning block. The front side of the positioning block has a detection through hole, and a micrometer is provided on the positioning block. The micrometer's front end screw is located inside the detection through hole. The other end of the base plate is provided with an elastic sliding mechanism. An insulating block is provided on the side of the elastic sliding mechanism near the positioning block. The insulating block has two opening slots on the side near the positioning block. A spring needle is provided in each of the two opening slots, and the needle tip of the spring needle faces the positioning block. The needle tubes of the spring needles are electrically connected to an audible and visual alarm through wires.

2. The mandrel opening length detection fixture according to claim 1, characterized in that: A positioning protrusion ring is provided on the outer side of the detection through hole.

3. The mandrel breakout length detection tool of claim 1, wherein: The top and rear sides of the opening groove are open, and the spring pin is fixed in the opening groove with glue.

4. The mandrel opening length detection fixture according to claim 1, characterized in that: The elastic sliding mechanism includes a concave guide block and a fixed plate. The concave guide block is disposed on the base plate. A sliding rod is movably inserted through the center of the concave guide block along the length of the base plate. The fixed plate is disposed at the other end of the sliding rod and can move with the sliding rod. The insulating block is disposed on the side of the fixed plate near the positioning block. A limit nut is disposed on the sliding rod located in front of the concave guide block. A spring is sleeved on the sliding rod located between the concave guide block and the fixed plate.

5. The mandrel opening length detection fixture according to claim 4, characterized in that: Two guide rods are movably inserted into the concave guide block along the length of the base plate, and the two guide rods are located on both sides of the slide rod. The other end of the guide rod is set on the fixed plate, and the guide rod moves with the fixed plate.

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