Quick plugging mandrel for centrifugal switch test

Abstract

The invention 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 an existing 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] The present invention relates to a centrifuge switch test spindle for centrifuge switch testing, and is a quick plug - and - unplug spindle for centrifuge switch testing. Background Art

[0002] A centrifuge switch is a switching device used to control the starting coil of a single - phase motor. It is usually installed on the rotor of the motor, and the circuit is connected in series in the starting circuit. It is mainly used to control the starting coil of the single - phase motor, that is, the switch conducts when the rotor is stationary and disconnects when it reaches a certain speed. The centrifuge switch mainly consists of two parts, including a centrifugal mechanism that rotates around the motor shaft and a fixed switch (switch blade) with an electrical contact device. For example, the application number 201220504959.5 disclosed in Chinese patent literature, the authorization announcement date is March 13, 2013, and the utility model name is "Centrifuge Switch"; another example is the application number 03144495.4 disclosed in Chinese patent literature, the publication date is March 30, 2005, and the invention name is "Centrifuge Switch for Motor of Dryer". Before leaving the factory, such centrifuge switch products and similar products need to be tested. Generally, such tests are achieved by quickly plugging and unplugging the centrifuge switch test spindle installed on the motor shaft and the switch blade under the energized state. However, the existing centrifuge switch test spindles of this kind are generally not adjustable. There is rubber pad under the chuck, and manual operation is required to adjust the elasticity of the rubber. And the overall assembly is relatively difficult. Sometimes it is very tight and heavy, and the operation is rather laborious. Sometimes it is very light and loose, and when rotating during testing, the axial position will change. Summary of the Invention

[0003] To overcome the above - mentioned deficiencies, the purpose of the present invention is to provide a quick plug - and - unplug spindle for centrifuge switch testing to the field, so as to solve the technical problems that it is difficult to adjust the pressing force of the test spindle of existing similar centrifuge switch products, and it is easy to produce changes in tightness after repeated plugging and unplugging operations, and it is difficult to reach the optimal state. Its purpose is achieved by the following technical solutions.

[0004] A quick - plug - and - unplug mandrel for centrifugal switch testing. The quick - plug - and - unplug mandrel includes a mandrel, a positioning ring, an elastomer, and a movable block. An installation hole for fixing to the motor shaft is provided at the flange at one end of the mandrel. A positioning ring that is sleeved and limitedly fixed in the stepped groove is provided at the stepped groove of the outer diameter of the rod body at the other end of the mandrel. A ring - mouth groove is provided in the inner diameter at the ring - mouth of the positioning ring. Through - holes are equidistantly arranged on the rod body of the mandrel at the inner side of the ring - mouth groove. Movable blocks are respectively embedded in the through - holes. While the inner diameters of the movable blocks respectively abut against the outer diameter of the elastomer inside the mandrel, one ends of the outer diameters of the movable blocks respectively abut against the inner diameter below the ring - mouth groove of the positioning ring, and the other ends of the outer diameters of the movable blocks respectively protrude and expose the ring - mouth groove of the positioning ring. The exposed part of the movable block is higher than the outer diameter of the mandrel. The key point of its structural design is that a cylindrical hole is provided in the rod body of the mandrel, the elastomer is arranged in the cylindrical hole of the mandrel, and rear gaskets and front gaskets are respectively provided at both ends of the elastomer in the cylindrical hole. A rear adjustment screw is provided in the small screw hole that communicates the bottom of the cylindrical hole at the rear gasket with the flange of the rod body. A front adjustment screw is provided in the hole opening of the cylindrical hole at the front gasket. An internal hexagonal hole is provided at the top of the front adjustment screw.

[0005] The outer diameter of the end of the rod body of the mandrel on the side where the exposed part of the movable block is higher than the mandrel is tapered and reduced at 4 degrees, and the outer diameters of the ends of the movable blocks on the side where the exposed part of the movable block is higher than the mandrel are respectively inclined surfaces 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 larger than the diameter of the other end, and the diameter of one end of the through - hole of the mandrel is 0.6 mm larger than the diameter of the end part.

[0006] One end of the inclined surface of the inner diameter of the movable block is stepped and wedged into the inner wall of the through - hole of the mandrel, and the other outer diameters of the movable block respectively abut against the lower stepped groove below the ring - mouth groove of the positioning ring, and the depth of the lower stepped groove is less than 0.2 mm.

[0007] The length from the center of the through - hole of the mandrel to one side of the flange 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 rod body of the mandrel, and the width is 0.4 mm.

[0008] The elastomer is a cylindrical sponge silicone. The elastomer in the mandrel is deformed through the internal hexagonal hole of the front adjustment screw to adjust the tightening range of the pressing force between the elastomer and the movable block.

[0009] The screw hole diameter of the rear adjustment screw is one - half of the screw hole diameter of the front adjustment screw.

[0010] The mounting hole of the mandrel is fixedly arranged on the motor shaft protruding from within the test motor base. At the end face of the motor shaft extension of the test motor base, a test switch plate is fixedly provided. The wiring terminals of the test switch plate are respectively clamped by test wire clips and connected to conduct power. The positioning ring at the mandrel is higher than the test switch plate. The central holes at the base sheet metal of the test centrifugal switch body are respectively inserted and sleeved one by one onto the outer diameter of the mandrel protruding from the positioning ring, and are abutted and fixed to the movable block exposed at the mandrel. The test wire clip is energized through the on-off switch at the wiring point, enabling the test centrifugal switch body to automatically close and rotate through the springs symmetrically arranged in pairs on both sides and the centrifugal push members symmetrically arranged on both sides. That is, after the test centrifugal switch body is inserted into the mandrel, if it closes and rotates under the energized state of the automatic on-off switch, it indicates that the product quality is qualified, and it can be pulled out after the test centrifugal switch body stops rotating when powered off. Otherwise, if the test centrifugal switch body does not rotate, it is an unqualified test centrifugal switch body.

[0011] At least three equally spaced cylinder ejector rods are provided on the outer side of the motor shaft of the test motor base. The cylinder ejector rods are in an L shape, and the L-shaped end of the cylinder ejector rod is located below the test centrifugal switch body at the outer diameter of the positioning ring; when the test centrifugal switch body is inserted into the mandrel and waits for the automatic on-off switch to power off and the delay switch to start delaying to make the test centrifugal switch body stop rotating, the cylinder ejector rods simultaneously extend and push the test centrifugal switch body out from the mandrel, and then the cylinder ejector rods automatically reset to wait for the next automatic telescopic operation. The cylinder switches and delay switches of the cylinder ejector rods are connected to the automatic on-off switch through circuits.

[0012] The cylinder ejector rods are respectively actuated synchronously by the corresponding cylinders, or by the cylinders at the bottom of the cylinder seat provided with the cylinder ejector rods.

[0013] A baffle protection seat for aligning with the mandrel and pushing out the test centrifugal switch body by the cylinder ejector rod is provided on the workbench in front of the mandrel of the test motor base.

[0014] The structure of the present invention is reasonably designed, convenient for assembly and use, with a long service life. In particular, the pressing force of the movable block is convenient to adjust, and it has a high degree of automation and high safety when applied to the corresponding test device; it is suitable for use as a quick plug-in mandrel for centrifugal switch testing and the structural improvement of its similar products. Brief Description of the Drawings

[0015] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the present invention.

[0016] Figure 2 is Figure 1 The right view structure diagram of

[0017] Figure 3 is Figure 1 The partial structure schematic diagram of the test use state of

[0018] Figure 4 Yes Figure 3 Schematic diagram of the structure after the test centrifugal switch body is installed.

[0019] Figure 5 Yes Figure 1 Schematic diagram of the three-dimensional structure.

[0020] Figure 6 Schematic diagram of the three-dimensional structure of existing similar products.

[0021] Drawing serial numbers and names: 1. Mandrel, 101. Mounting hole, 102. Cylindrical hole, 2. Rear adjusting screw, 3. Rear gasket, 4. Positioning ring, 401. Ring groove, 402. Low stepped groove, 5. Elastic body, 6. Movable block, 601. Inclined surface, 7. Front gasket, 8. Front adjusting screw, 801. Hexagon socket head, 9. Cylinder ejector rod, 10. Test motor base, 11. Test wire clamp, 12. Test switch piece, 13. Test centrifugal switch body, 1301. Base sheet metal. Embodiment

[0022] Now, in combination with the drawings, the structure of the present invention will be further described. As Figures 1-5 shown, the quick-disconnecting mandrel includes a mandrel 1, a positioning ring 4, an elastic body 5 and a movable block 6. An installation hole 101 for fixing to the motor shaft is provided at the flange at one end of the mandrel. A positioning ring that is sleeved and limitedly fixed in the stepped groove is provided at the outer diameter stepped groove of the rod body at the other end of the mandrel. A ring groove 401 is provided at the inner diameter of the ring mouth of the positioning ring. Through holes are provided at equal intervals on the rod body of the mandrel at the inner side of the ring groove. Movable blocks are respectively embedded in the through holes. While the inner diameters of the movable blocks are respectively abutted against the outer diameter of the elastic body inside the mandrel, one ends of the outer diameters of the movable blocks are respectively abutted against the inner diameter below the ring groove of the positioning ring, and the other ends of the outer diameters of the movable blocks respectively extend out and expose the ring groove of the positioning ring. The exposed part of the movable block is higher than the outer diameter of the mandrel. Its specific structure is as follows: A cylindrical hole 102 is provided in the rod body of the above-mentioned mandrel. The elastic body is arranged in the cylindrical hole of the mandrel, and rear gaskets 3 and front gaskets 7 are respectively provided at both ends of the elastic body in the cylindrical hole. A rear adjusting screw 2 is provided in the small screw hole that communicates the bottom of the cylindrical hole at the rear gasket with the flange of the rod body. A front adjusting screw 8 is provided in the hole opening of the cylindrical hole at the front gasket. The top of the front adjusting screw is provided with a hexagon socket head 801. The end outer diameter of the rod body of the mandrel on the side where the exposed part of the movable block is higher than the mandrel is tapered and reduced by 4 degrees. The end outer diameters of the movable blocks on the side where the exposed part of the movable block is higher than the mandrel are respectively provided with inclined surfaces 601 that are greater than 4 degrees and less than 6 degrees; The diameter of one end of the inclined surface of the inner diameter of the movable block is 0.35 mm larger than that of the other end, and the diameter of one end of the through hole of the mandrel is 0.6 mm larger than the end diameter. One end of the inclined surface of the inner diameter of the movable block is stepped and wedged into the inner wall of the through hole of the mandrel, and the other outer diameters of the movable blocks are respectively abutted against the low stepped groove 402 below the ring groove of the positioning ring. The depth of the low stepped groove is less than 0.2 mm.

[0023] The length from the center of the through-hole of the mandrel to one side of the flange 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. The elastomer is a cylindrical sponge silicone. The elastomer is deformed within the mandrel through the hexagonal hole of the front adjustment screw to adjust the tightness range of the compression force between the elastomer and the movable block. The screw hole diameter at the rear adjustment screw is half the screw hole diameter at the front adjustment screw. This ensures that when the front adjustment screw of the elastomer is rotated through the hexagonal hole to adjust the position, the change in compression force generated by the elastic deformation range of the elastomer is mainly concentrated at the movable block. That is, the front adjustment screw is mainly used for fine-tuning the compression force at the movable block, and the rear adjustment screw is only used when the position of the elastomer in the mandrel needs to be significantly adjusted.

[0024] According to the above-mentioned structural characteristics, its automated detection method and structure are specifically as follows: the mounting hole of the above-mentioned core rod is fixedly set on the motor shaft extending from the test motor seat 10, and a test switch piece 12 is fixed on the end face of the motor shaft extending from the test motor seat. The connection terminals of the test switch piece are respectively clamped by the test wire clamp 11 and connected to the power supply. The positioning ring 4 at the core rod is higher than the test switch piece, and the center hole at the base sheet metal 1301 of the test centrifugal switch body 13 is respectively inserted and pulled out one by one into the outer diameter of the core rod extending out of the positioning ring, and is fixed to the movable block exposed at the core rod. The test wire clamp is energized by the automatic on-off switch at the connection point, so that the test centrifugal switch body is automatically closed and rotated through 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 test motor seat is provided with at least three equidistantly spaced cylinder push rods 9. The cylinder push rods are L-shaped, with the L-shaped ends of the cylinder push rods positioned below the test centrifugal switch body on the outer diameter of the positioning ring. When the test centrifugal switch body is inserted into the core rod and waits for the automatic on / off switch to power off and the delay switch to delay activation, causing the test centrifugal switch body to stop rotating, the cylinder push rods simultaneously extend and push the test centrifugal switch body off the core rod. The cylinder push rods then 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 via a circuit. The cylinder push rods are synchronously operated by corresponding cylinders or by the cylinder at the bottom of the cylinder seat on which the cylinder push rods are provided. Thus, when the test centrifugal switch body is powered off and stopped during testing, the cylinder push rods are activated by the delay switch to eject the test centrifugal switch body from the core rod.

[0026] Furthermore, a baffle guard is provided on the workbench in front of the core rod of the test motor seat, which is aligned with the core rod and pushes out the test centrifugal switch body via the cylinder push rod. Therefore, when the push-out force of the cylinder push rod is large, the test centrifugal switch body will collide with the baffle guard and fall, without causing damage to the test centrifugal switch body or causing the test centrifugal switch body to fall.

[0027] In summary, the quick-release mandrel has the following characteristics: 1) This mandrel is dedicated to the testing of centrifuges. 2) The bottom flange of the 25-mm mandrel has a diameter of 30 mm, and the coaxiality is less than 0.02 mm. 3) The movable block and the square hole of the mandrel are flexible without jamming. As Figure 6 shown in the figure is an existing similar product. The fixture (collet) of the existing similar product is non-adjustable, and there is rubber pad under the collet. It is necessary to manually adjust the elasticity of the rubber. Moreover, the overall assembly is relatively difficult. Sometimes it is very tight and heavy, making the operation quite laborious. Sometimes it is very light and loose. When rotating during the test, the axial position will change. However, the pressing force of this quick-release mandrel is adjustable. There is sponge silica gel as an elastic body inside the mandrel. After adjusting to the optimal state, there will be no looseness during the test, and the position will not move. It can be pulled out and inserted, meeting the requirements of repeated plugging and unplugging operations for many times. It should be neither too soft nor too hard.

Claims

1. A quick plug - and - unplug mandrel for centrifugal switch testing. The quick plug - and - unplug mandrel includes a mandrel rod (1), a positioning ring (4), an elastomer (5) and a movable block (6). An installation hole (101) for installation and fixation on the motor shaft is provided at the flange at one end of the mandrel rod. A positioning ring that is sleeved and limitedly fixed in the stepped groove is provided at the stepped groove of the outer diameter of the mandrel rod at the other end of the mandrel rod. A ring - mouth groove (401) is provided at the inner diameter of the ring - mouth of the positioning ring. Through - holes are equidistantly arranged on the mandrel rod at the inner side of the ring - mouth groove. Movable blocks are respectively embedded in the through - holes. While the inner diameters of the movable blocks respectively abut against the outer diameter of the elastomer inside the mandrel rod, one ends of the outer diameters of the movable blocks respectively abut against the inner diameter below the ring - mouth groove of the positioning ring, and the other ends of the outer diameters of the movable blocks respectively extend out and expose the ring - mouth groove of the positioning ring. The exposed parts of the movable blocks are higher than the outer diameter of the mandrel rod. It is characterized in that A cylindrical hole (102) is provided in the rod body of the mandrel (1). The elastomer (5) is arranged in the cylindrical hole of the mandrel, and a rear gasket (3) and a front gasket (7) are respectively provided at both ends of the elastomer in the cylindrical hole. A rear adjustment screw (2) is provided in a small screw hole communicating with the bottom of the cylindrical hole at the rear gasket and the flange of the rod body. A front adjustment screw (8) is provided in the orifice of the cylindrical hole at the front gasket, and an internal hexagonal hole (801) is provided at the top of the front adjustment screw.

2. The quick pluggable mandrel for centrifugal switch testing according to claim 1, characterized in that The outer diameter of the end of the exposed part of the movable block (6) on one side of the mandrel (1) is tapered and reduced by 4 degrees. The outer diameters of the ends of the exposed part of the movable block on one side of the mandrel are respectively inclined surfaces (601) with an angle 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 larger than that of the other end, and the diameter of one end of the through hole of the mandrel is 0.6 mm larger than the end diameter.

3. The quick pluggable mandrel for centrifugal switch testing according to claim 2, characterized in that One end of the inclined surface (601) of the inner diameter of the movable block (6) is stepped and wedged into the inner wall of the through hole of the mandrel (1), and the outer diameters of the other ends of the movable block respectively abut against the lower stepped groove (402) below the ring groove (401) of the positioning ring (4). The depth of the lower stepped groove is less than 0.2 mm.

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

5. The quick pluggable mandrel for centrifugal switch testing according to claim 2, characterized in that The elastomer (5) is a cylindrical sponge silicone. The elastomer in the mandrel (1) is deformed through the internal hexagonal hole (801) of the front adjustment screw (8) to adjust the tightening range of the pressing force between the elastomer and the movable block (6).

6. The quick pluggable mandrel for centrifugal switch testing according to claim 5, characterized in that The screw hole diameter of the rear adjustment screw (2) is one-half of the screw hole diameter of the front adjustment screw (8).

7. The quick pluggable mandrel for centrifugal switch testing according to claim 1, characterized in that The mounting hole (101) of the mandrel (1) is fixedly arranged on the motor shaft extending out of the test motor base (10). A test switch piece (12) is fixedly arranged on the end face of the motor shaft extension of the test motor base. The wiring terminals of the test switch piece are respectively clamped and connected to the power supply through test wire clips (11). The positioning ring (4) at the mandrel is higher than the test switch piece. The center holes of the base sheet metal (1301) of the test centrifugal switch body (13) are respectively inserted and sleeved onto the outer diameter of the mandrel extending out of the positioning ring one by one, and abutted and fixed to the exposed movable block (6) at the mandrel. The test wire clip is energized through the automatic on-off switch at the wiring point, so that the test centrifugal switch body is automatically closed and rotated through the springs symmetrically arranged on both sides and the centrifugal pushing parts symmetrically arranged on both sides.

8. The quick plug-in and unplug spindle for centrifugal switch testing according to claim 7, characterized in that At least three equally spaced cylinder ejector rods (9) are provided on the outer side of the motor shaft of the test motor base (10). The cylinder ejector rods are in an L shape, and the L-shaped end of the cylinder ejector rod is located below the test centrifugal switch body (13) with an outer diameter of the positioning ring (4). When the test centrifugal switch body is inserted into the mandrel (1) and waits for the automatic on-off switch to cut off the power and the delay switch to start delaying, when the rotation of the test centrifugal switch body stops, the cylinder ejector rods extend out simultaneously and push the test centrifugal switch body out of the mandrel, and then the cylinder ejector rods automatically reset and wait for the next automatic telescopic operation. The cylinder switches and delay switches of the cylinder ejector rods are connected to the automatic on-off switch through circuits.

9. The quick pluggable mandrel for centrifugal switch testing according to claim 8, characterized in that The cylinder push rod (9) is synchronously actuated by a cylinder respectively, or by a cylinder at the bottom of a cylinder seat provided with a cylinder push rod.

10. The quick pluggable mandrel for centrifugal switch testing according to claim 8, characterized in that A baffle protection seat for pushing out the test centrifugal switch body (13) by the cylinder push rod (9) is provided at the workbench in front of the mandrel (1) of the test motor base (10) at the alignment position of the mandrel.

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