Rapid plugging mandrel for centrifugal switch test

Abstract

The utility model relates to a rapid plugging mandrel for centrifugal switch testing, and aims to solve the technical problems that the pressing force of a testing mandrel of a conventional similar centrifugal switch product is difficult to adjust, the tightness is easy to change after repeated plugging operation, and the best state is difficult to reach. Through holes which are arranged at equal intervals are formed in an upper rod body of a core rod on the inner side of an upper ring opening groove of a positioning ring of the quick plugging mandrel, and the exposed parts of inner movable blocks in the through holes are higher than the outer diameter of the core rod; the core rod is characterized in that a cylindrical hole is formed in a rod body of the core rod, the elastic body is arranged in the cylindrical hole of the core rod, a rear gasket and a front gasket are arranged at the two ends of the elastic body in the cylindrical hole respectively, and a rear adjusting screw is arranged in a small screw hole, communicated with a flange of the rod body, of the bottom of the cylindrical hole at the rear gasket. A front adjusting screw is arranged in a hole opening of the cylindrical hole in the front gasket, an inner hexagonal hole is formed in the top of the front adjusting screw, the elastic body is cylindrical sponge silica gel, and the end of the rod body of the core rod and the inclined face of the outer diameter of the movable block incline correspondingly.

Description

Technical Field

[0001] This utility model relates to a centrifugal switch test spindle for centrifugal switch testing, which is a quick-plug spindle for centrifugal switch testing. Background Technology

[0002] A centrifugal switch is a switching device used to control the starting coil of a single-phase motor. It is usually installed on the motor rotor, and the circuit is connected in series in the starting circuit. It is mainly used to control the starting coil of a single-phase motor, that is, the switch is turned on when the rotor is stationary and turns off when a certain speed is reached. A centrifugal switch mainly consists of two parts, including a centrifugal mechanism that rotates around the motor shaft and a fixed switch (switch piece) with electrical contact device. For example, Chinese patent application number 201220504959.5, authorized on March 13, 2013, entitled "Centrifugal Switch"; and Chinese patent application number 03144495.4, published on March 30, 2005, entitled "Centrifugal Switch for Motor of Dryer"; such centrifugal switch products and similar products require testing before leaving the factory. This testing is generally achieved by quickly inserting and removing the centrifugal switch test shaft core and switch plate installed on the motor shaft while they are energized. However, the existing centrifugal switch test shaft cores are generally not adjustable. The clamps are padded with rubber, and the elasticity of the rubber needs to be adjusted manually. Moreover, the overall assembly is relatively difficult. Sometimes it is very tight and heavy, and the operation is laborious. Sometimes it is very light and loose. When rotating during testing, the axial position will change. Summary of the Invention

[0003] To overcome the above shortcomings, the purpose of this utility model is to provide a quick-release mandrel for centrifugal switch testing, thereby solving the technical problem that the clamping force of the test mandrel in existing centrifugal switch products is difficult to adjust, and the tightness easily changes after repeated insertion and removal operations, making it difficult to achieve the optimal state. This objective is achieved through the following technical solution.

[0004] A quick-release mandrel for testing centrifugal switches includes a mandrel, a positioning ring, an elastic body, and movable blocks. One end of the mandrel has a flange with a mounting hole for fixing to a motor shaft. The other end of the mandrel has a stepped groove on its outer diameter, into which a positioning ring is fitted and fixed. The inner diameter of the positioning ring has a groove. The mandrel body inside the groove has equidistant through holes. Movable blocks are embedded in each through hole. The inner diameter of each movable block abuts against the outer diameter of the elastic body inside the mandrel, while one end of the movable block's outer diameter abuts against the lower inner diameter of the positioning ring's groove. The other end of the movable block's outer diameter extends out of the positioning ring's groove, with the exposed portion of the movable block exceeding the outer diameter of the mandrel. The key structural design features a cylindrical hole inside the core rod, with an elastic body positioned within the cylindrical hole. A rear washer and a front washer are positioned at both ends of the elastic body within the cylindrical hole. A rear adjusting screw is located in a small screw hole at the bottom of the cylindrical hole of the rear washer, which connects to the flange of the core rod. A front adjusting screw is located in the opening of the cylindrical hole of the front washer, and an internal hexagonal hole is located at the top of the front adjusting screw.

[0005] The outer diameter of the end of the movable block protruding above the core rod is tapered at 4 degrees. The outer diameter of the end of the movable block protruding above the core rod is inclined at a slope greater than 4 degrees and less than 6 degrees. The diameter of one end of the inclined surface of the movable block is 0.35 mm greater than the diameter of the other end. The diameter of one end of the through hole of the core rod is 0.6 mm greater than the diameter of the end.

[0006] One end of the inclined surface of the movable block protrudes in a stepped manner and weds into the inner wall of the through hole of the mandrel. The outer diameter of the other end of the movable block abuts against the low-step groove below the locating ring groove. The depth of the low-step groove is less than 0.2mm.

[0007] The length from the center of the through hole of the mandrel to the flange side is two-thirds of the total length of the mandrel, the length of the movable block is one-third of the total length of the mandrel body, and the width is 0.4mm.

[0008] The elastomer is a cylindrical sponge silicone. The elastomer is deformed by the internal hexagonal hole of the front adjusting screw to adjust the tightness range of the clamping force between the elastomer and the moving block.

[0009] The diameter of the screw hole at the rear adjusting screw is half the diameter of the screw hole at the front adjusting screw.

[0010] The mounting hole of the mandrel is fixedly set in the motor shaft extending from the test motor base. A test switch piece is fixedly installed on the end face of the motor shaft extending from the test motor base. The terminals of the test switch piece are clamped and connected to the power supply by test wire clamps. The positioning ring at the mandrel is higher than the test switch piece. The center holes of the sheet metal base of the test centrifugal switch body are inserted and removed one by one into the outer diameter of the mandrel extending from the positioning ring, and are fixed against the movable block exposed at the mandrel. The test wire clamp is energized by the automatic on / off switch at the connection point, causing the test centrifugal switch body to automatically close and rotate through the springs and centrifugal pushers symmetrically arranged on both sides. That is, if the test centrifugal switch body closes and rotates when the automatic on / off switch is energized after the mandrel is inserted, it indicates that the product quality is qualified. It can be pulled out after the test centrifugal switch body stops when the power is turned off. Otherwise, the test centrifugal switch body will not rotate, indicating that the test centrifugal switch body is unqualified.

[0011] The test motor base has at least three equidistantly spaced cylinder push rods on the outside of the motor shaft. The cylinder push rods are L-shaped, and the L-shaped ends of the cylinder push rods are located below the test centrifugal switch body on the outer diameter of the positioning ring. When the test centrifugal switch body is inserted into the mandrel and waits for the automatic power-on / off switch to turn off and the delay switch to start after a delay so that the test centrifugal switch body stops rotating, the cylinder push rods extend and push the test centrifugal switch body out of the mandrel. After that, the cylinder push rods automatically reset and wait for the next automatic extension and retraction operation. The cylinder switch and delay switch of the cylinder push rods are connected to the automatic power-on / off switch through a circuit.

[0012] The cylinder push rod is operated synchronously by the corresponding cylinder or by the cylinder at the bottom of the cylinder seat equipped with the cylinder push rod.

[0013] The test motor base has a protective baffle on the worktable in front of the mandrel, which is used to push out the test centrifugal switch body through the cylinder push rod at the alignment point of the mandrel.

[0014] This utility model has a reasonable structural design, is easy to assemble and use, and has a long service life. In particular, the clamping force of the movable block is easy to adjust. When applied to corresponding testing devices, it has a high degree of automation and high safety. It is suitable for use as a quick-plug mandrel for centrifugal switch testing and is a structural improvement of similar products. Attached Figure Description

[0015] Figure 1 This is a cross-sectional structural diagram of an embodiment of the present invention.

[0016] Figure 2 yes Figure 1 A schematic diagram of the right-side structure.

[0017] Figure 3 yes Figure 1 The test usage state part structure diagram.

[0018] Figure 4 yes Figure 3 A schematic diagram of the structure after the centrifugal switch body is installed.

[0019] Figure 5 yes Figure 1 A schematic diagram of the three-dimensional structure.

[0020] Figure 6 It is a three-dimensional structural diagram of existing similar products.

[0021] Attached Figures and Their Names: 1. Core Rod, 101. Mounting Hole, 102. Cylindrical Hole, 2. Rear Adjusting Screw, 3. Rear Washer, 4. Positioning Ring, 401. Ring Groove, 402. Low-Step Groove, 5. Elastomer, 6. Movable Block, 601. Inclined Surface, 7. Front Washer, 8. Front Adjusting Screw, 801. Hex Socket Hole, 9. Cylinder Push Rod, 10. Test Motor Mount, 11. Test Wire Clamp, 12. Test Switch Plate, 13. Test Centrifugal Switch Body, 1301. Base Sheet Metal. Implementation

[0022] The structure of this utility model will now be further described with reference to the accompanying drawings. For example... Figures 1-5 As shown, the quick-release mandrel includes a mandrel 1, a positioning ring 4, an elastic body 5, and a movable block 6. A mounting hole 101 for mounting and fixing to a motor shaft is provided at the flange of one end of the mandrel. A positioning ring is fitted into and fixed to the stepped groove at the outer diameter of the mandrel at the other end. The inner diameter of the positioning ring's opening has a groove 401. The mandrel body inside the groove has equidistantly spaced through holes. Movable blocks are embedded in each through hole. The inner diameter of the movable block abuts against the outer diameter of the inner elastic body of the mandrel, while one end of the movable block's outer diameter abuts against the lower inner diameter of the positioning ring's groove. The other end of the movable block's outer diameter extends out and exposes the positioning ring's groove, with the exposed portion of the movable block exceeding the outer diameter of the mandrel. The specific structure is as follows: A cylindrical hole 102 is provided inside the core rod. An elastic body is disposed within the cylindrical hole of the core rod. A rear gasket 3 and a front gasket 7 are respectively provided at both ends of the elastic body within the cylindrical hole. A rear adjusting screw 2 is provided in a small screw hole at the bottom of the cylindrical hole of the rear gasket, which communicates with the flange of the core rod. A front adjusting screw 8 is provided in the opening of the cylindrical hole of the front gasket, and an internal hexagonal hole 801 is provided at the top of the front adjusting screw. The outer diameter of the end of the core rod protruding above the core rod on the side of the movable block is tapered at 4 degrees. The outer diameter of the end of the movable block protruding above the core rod on the side of the movable block is formed by inclined planes 601 with a degree greater than 4 degrees and less than 6 degrees. The diameter of one end of the inclined plane of the movable block is 0.35 mm greater than the diameter of the other end. The diameter of one end of the through hole of the core rod is 0.6 mm greater than the diameter of the end portion. One end of the inclined surface of the movable block protrudes in a stepped manner and weds into the inner wall of the through hole of the mandrel. The outer diameter of the other end of the movable block abuts against the low-step groove 402 below the groove of the positioning ring. The depth of the low-step groove is less than 0.2mm.

[0023] The length from the center of the through hole to the flange side of the aforementioned mandrel is two-thirds of the total length of the mandrel. The length of the movable block is one-third of the total length of the mandrel body, and its width is 0.4mm. The elastomer is a cylindrical sponge silicone. The elastomer is adjusted by deforming the elastomer inside the mandrel through the internal hexagonal hole of the front adjusting screw, thereby adjusting the tightness range of the clamping force between the elastomer and the movable block. The screw hole diameter of the rear adjusting screw is half that of the screw hole diameter of the front adjusting screw. This ensures that when the position of the elastomer is adjusted by rotating the front adjusting screw through the internal hexagonal hole, the change in clamping force generated by the elastic deformation range of the elastomer is mainly concentrated at the movable block. That is, the front adjusting screw is mainly used for fine adjustment of the clamping force at the movable block, while the rear adjusting screw is only used when a large adjustment of the position of the elastomer inside the mandrel is required.

[0024] Based on the above structural characteristics, the automated testing method and structure are as follows: The mounting hole of the core rod is fixedly set in the motor shaft extending inside the test motor base 10. The end face of the motor shaft extending from the test motor base is fixedly provided with a test switch piece 12. The wiring terminals of the test switch piece are clamped and connected to the power supply through the test wire clamp 11. The positioning ring 4 at the core rod is higher than the test switch piece. The center hole of the base sheet metal 1301 of the test centrifugal switch body 13 is inserted and unplugged into the outer diameter of the core rod extending from the positioning ring, and is fixed against the movable block exposed at the core rod. The test wire clamp is energized through the automatic on / off switch at the wiring terminal, so that the test centrifugal switch body is automatically closed and rotated by the springs symmetrically arranged on both sides and the centrifugal pushers symmetrically arranged on both sides.

[0025] Furthermore, the outer side of the motor shaft of the aforementioned test motor base is provided with at least three equidistantly arranged cylinder push rods 9. The cylinder push rods are L-shaped, with the L-shaped ends located below the test centrifugal switch body on the outer diameter of the positioning ring. When the test centrifugal switch body is inserted into the mandrel and waits for the automatic power-on / off switch to de-energize and the delay switch to activate, causing the test centrifugal switch body to stop rotating, the cylinder push rods simultaneously extend and push the test centrifugal switch body off the mandrel. After that, the cylinder push rods automatically reset and wait for the next automatic extension / retraction operation. The cylinder switch and delay switch of the cylinder push rods are connected to the automatic power-on / off switch via wiring. The cylinder push rods are operated synchronously through corresponding cylinders or through the cylinders at the bottom of the cylinder base equipped with cylinder push rods. Thus, after the test centrifugal switch body is de-energized and stops during testing, the cylinder push rods activate via the delay switch to push the test centrifugal switch body off the mandrel.

[0026] Furthermore, the worktable in front of the mandrel of the test motor base is equipped with a baffle protective seat that aligns the mandrel and pushes out the test centrifugal switch body via a cylinder push rod. Therefore, when the pushing force of the cylinder push rod is large, the test centrifugal switch body will fall after colliding with the baffle protective seat, without causing damage to the test centrifugal switch body or causing it to fall off.

[0027] In summary, this quick-release mandrel has the following characteristics: 1) This mandrel is specifically designed for centrifuge testing; 2) The bottom flange of the 25mm diameter mandrel is 30mm in diameter, with a misalignment of less than 0.02mm; 3) The movable block and the square hole of the mandrel move flexibly without jamming. Figure 6 The image shows an existing product of the same type. The clamp (clamp) of this product is not adjustable. A rubber pad is placed under the clamp, requiring manual adjustment of the rubber's elasticity. Furthermore, assembly is difficult; sometimes it's too tight and heavy, requiring considerable effort, and sometimes it's too light and loose. During testing, even a slight rotation causes a change in axial position. In contrast, the clamping force of this quick-release mandrel is adjustable. The mandrel contains a sponge-silicone elastic element. When adjusted to the optimal state, it will not loosen during testing, and its position will remain stable. It can be pulled out and inserted repeatedly, satisfying multiple insertion and removal operations without being too soft or too hard.

Claims

1. A quick-release mandrel for testing centrifugal switches, the quick-release mandrel comprising a mandrel (1), a positioning ring (4), an elastic body (5), and movable blocks (6), wherein a mounting hole (101) for mounting and fixing to a motor shaft is provided at a flange at one end of the mandrel, and a positioning ring is provided at a stepped groove on the outer diameter of the mandrel at the other end of the mandrel for fitting and limiting and fixing to the stepped groove, and a groove (401) is provided on the inner diameter of the groove of the positioning ring, and through holes are provided at equal intervals on the mandrel body inside the groove, and movable blocks are respectively provided at the through holes, wherein the inner diameter of the movable blocks abuts against the outer diameter of the elastic body inside the mandrel, and one end of the outer diameter of the movable blocks abuts against the inner diameter below the groove of the positioning ring, and the other end of the outer diameter of the movable blocks extends out and exposes the groove of the positioning ring, and the exposed part of the movable blocks is higher than the outer diameter of the mandrel; characterized in that The core rod (1) has a cylindrical hole (102) inside its body. An elastic body (5) is placed inside the cylindrical hole of the core rod. The two ends of the elastic body inside the cylindrical hole are respectively provided with a rear gasket (3) and a front gasket (7). A rear adjusting screw (2) is provided in the small screw hole at the bottom of the cylindrical hole of the rear gasket that communicates with the flange of the core rod. A front adjusting screw (8) is provided in the opening of the cylindrical hole of the front gasket. The top of the front adjusting screw is provided with an internal hexagonal hole (801).

2. The centrifugal switch test quick-plug mandrel according to claim 1, characterized in that... The outer diameter of the end of the movable block (6) that protrudes above the core rod (1) is tapered at 4 degrees. The outer diameter of the end of the movable block that protrudes above the core rod is a slope (601) with a degree greater than 4 degrees and less than 6 degrees. The diameter of one end of the slope of the movable block is 0.35 mm greater than the diameter of the other end. The diameter of one end of the through hole of the core rod is 0.6 mm greater than the diameter of the end.

3. The centrifugal switch test quick-plug mandrel according to claim 2, characterized in that... The inclined surface (601) of the inner diameter of the movable block (6) protrudes in a stepped manner at one end and wedges into the inner wall of the through hole of the core rod (1). The outer diameter of the other end of the movable block abuts against the low-step groove (402) below the ring groove (401) of the positioning ring (4). The depth of the low-step groove is less than 0.2mm.

4. The centrifugal switch test quick-plug mandrel according to claim 2, characterized in that... The length from the center of the through hole of the mandrel (1) to the flange side is two-thirds of the total length of the mandrel, the length of the movable block (6) is one-third of the total length of the mandrel body, and the width is 0.4mm.

5. The centrifugal switch test quick-plug mandrel according to claim 2, characterized in that... The elastomer (5) is a cylindrical sponge silicone. The elastomer is adjusted by deforming the elastomer inside the mandrel (1) through the internal hexagonal hole (801) of the front adjusting screw (8) to adjust the tightness range of the clamping force between the elastomer and the movable block (6).

6. The centrifugal switch test quick-plug mandrel according to claim 5, characterized in that... The diameter of the screw hole at the rear adjusting screw (2) is half the diameter of the screw hole at the front adjusting screw (8).

7. The centrifugal switch test quick-plug mandrel according to claim 1, characterized in that... The mounting hole (101) of the core rod (1) is fixedly set in the motor shaft extending inside the test motor base (10). The end face of the motor shaft extending from the test motor base is fixedly provided with a test switch piece (12). The wiring terminals of the test switch piece are clamped and connected to the power supply through the test wire clamp (11). The positioning ring (4) at the core rod is higher than the test switch piece. The center hole at the base sheet metal (1301) of the test centrifugal switch body (13) is inserted and sleeved into the outer diameter of the core rod extending from the positioning ring, and is fixed against the movable block (6) exposed at the core rod. The test wire clamp is powered by the automatic on / off switch at the wiring terminal, so that the test centrifugal switch body is automatically closed and rotated by the springs symmetrically arranged on both sides and the centrifugal pushers symmetrically arranged on both sides.

8. The centrifugal switch test quick-plug mandrel according to claim 7, characterized in that... The test motor base (10) has at least three equidistantly spaced cylinder push rods (9) on the outside of the motor shaft. The cylinder push rods are L-shaped, and the L-shaped ends of the cylinder push rods are located below the test centrifugal switch body (13) on the outer diameter of the positioning ring (4). When the test centrifugal switch body is inserted into the core rod (1) and waits for the automatic on / off switch to turn off and the delay switch to start after a delay so that the test centrifugal switch body stops rotating, the cylinder push rods extend and push the test centrifugal switch body out of the core rod. After that, the cylinder push rods automatically reset and wait for the next automatic extension and retraction operation. The cylinder switch and delay switch of the cylinder push rods are connected to the automatic on / off switch through the line.

9. The centrifugal switch test quick-plug mandrel according to claim 8, characterized in that... The cylinder push rod (9) is operated synchronously through the cylinder or through the cylinder at the bottom of the cylinder seat equipped with the cylinder push rod.

10. The centrifugal switch test quick-plug mandrel according to claim 8, characterized in that... The test motor base (10) has a baffle protection seat in front of the mandrel (1) of the test centrifugal switch body (13) that is pushed out by the cylinder push rod (9) at the mandrel alignment point.

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