Detection equipment and test method for closing retention of permanent magnetic mechanism

Abstract

The invention discloses a permanent magnetic mechanism closing retention force detection device and a test method. A screw rod is vertically arranged on a support, one end of the screw rod is connected with a hand wheel, the other end of the screw rod is connected with a bulletproof sliding block, an upper connecting piece is inserted in the bulletproof sliding block, a sensing module is connected to the upper connecting piece, and a lower connecting piece is connected to the sensing module; the sensing module is connected with the sensor through a line; during testing, the permanent magnet is connected to the lower connecting piece, the hand wheel is rotated to drive the lead screw to move upwards, and the closing retention force of the permanent magnet can be detected. The device is simple in structure and easy to operate, labor-saving operation is achieved through a large reduction ratio by adopting a nut and screw rod structure, the actual force value of the permanent magnet can be evaluated and judged according to a test result, and the reliability of opening and closing actions of the operating mechanism is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage permanent magnet switch mechanism testing, and in particular to a detection device and a testing method for the closing holding force of a permanent magnet mechanism. Background Art

[0002] As a solution for high-voltage switches, high-voltage permanent magnet switch mechanisms are widely used in distribution network systems to achieve the closing and opening of high-voltage switches. The magnitude of the closing holding force of the permanent magnet determines the reliability of the closing operation of the operating mechanism. To ensure the reliability of closing, it is required that the closing holding force of the permanent magnet meets certain force value requirements. Currently, there is no ready-made and feasible testing device for the closing holding force of the permanent magnet mechanism in the industry. The closing holding force of the permanent magnet can usually only be obtained through force analysis and calculation to get the theoretical value, but the actual closing holding force value of the permanent magnet cannot be effectively measured, so an accurate assessment of the true closing holding force of the permanent magnet cannot be made. Summary of the Invention

[0003] In view of the above background of the blank in the existing permanent magnet testing device field, the applicant provides a detection device and a testing method for the closing holding force of a permanent magnet mechanism with a reasonable structure, which can accurately measure the true closing holding force of the permanent magnet, has a simple structure, is easy to operate, and has high testing efficiency.

[0004] The technical solution adopted by the present invention is as follows: A detection device for the closing holding force of a permanent magnet mechanism, a lead screw is vertically arranged on a bracket, one end of the lead screw is connected to a handwheel, and the other end is connected to a bulletproof slider. An upper connecting piece is inserted into the bulletproof slider, a sensing module is connected to the upper connecting piece, a lower connecting piece is connected to the sensing module, and the sensing module is connected to a sensor through a circuit; during testing, the permanent magnet is connected to the lower connecting piece, and by rotating the handwheel to drive the lead screw to move upward, the closing holding force of the permanent magnet can be detected.

[0005] As a further improvement of the above technical solution: A guide sleeve is sleeved outside the bulletproof slider, and the guide sleeve is in clearance fit with the bulletproof slider and is fixed on the bracket.

[0006] A bulletproof cavity is formed on the bulletproof slider, the lower end of the lead screw extends into the bulletproof cavity of the bulletproof slider, the lead screw is in clearance fit with the bulletproof slider, and a thrust bearing and a nut are sleeved on the rod part of the lead screw penetrating into the bulletproof cavity; the thrust bearing adopts a flat pressure thrust ball bearing.

[0007] The upper connecting piece is inserted through the bulletproof slider, the connecting rod is in clearance fit with the bulletproof slider, the upper connecting piece includes a head and a connecting rod, the head is located in the bulletproof cavity, the connecting rod passes through the lower jack of the lower cover, the connecting rod can move up and down along the lower jack, and the sensing module is connected to the bottom end of the connecting rod.

[0008] In the natural state, the height difference H1 between the top surface of the upper connecting member and the bottom surface of the lead screw is greater than the rebound height of the upper connecting member, and the height distance H2 between the top surface of the sensing module and the bottom surface of the bulletproof slider is greater than the rebound height of the sensing module.

[0009] The lower connecting member uses a double-threaded reverse-threaded nut sleeve, and its threaded hole is provided with a first threaded section and a second threaded section. The threads of the first threaded section and the second threaded section are in opposite directions. The first threaded section is a reverse thread, and the second threaded section is a positive thread. The first threaded section is connected to the sensing module through a connecting member, and the second threaded section is connected to the permanent magnet.

[0010] The sensing module is an S-shaped sensing component; at both ends of the sensing module where the threads are connected, a thread locking adhesive is used in combination with flat washers and spring washers to prevent loosening.

[0011] The bracket includes a bottom plate, a plurality of support columns, and a top plate. The plurality of support columns are vertically supported between the bottom plate and the top plate. A through hole is provided on the bottom plate. During the test, the permanent magnet passes through the through hole; the lead screw is vertically penetrated through the top plate, the handwheel is fixedly connected to the top end of the lead screw, and the bulletproof slider is fixedly connected to the bottom end of the lead screw; the sensor is fixed to the bracket through a mounting plate.

[0012] A test method for the closing holding force of a permanent magnet mechanism uses the above-mentioned permanent magnet mechanism closing holding force detection device to test the permanent magnet in the closed state. During the test, the permanent magnet in the closed state is connected to the lower connecting member, and the handwheel is rotated to pull up the permanent magnet through the lead screw. The force value at the moment when the permanent magnet is pulled to the separated state is the peak value of the closing holding force.

[0013] As a further improvement of the above technical solution: The closing holding force of the permanent magnet after closing can be tested in the energized state or the de-energized state.

[0014] The beneficial effects of the present invention are as follows: The structure of the present invention is simple. After the permanent magnet is connected to the lower connecting member, as long as the handwheel is rotated, the closing holding force of the permanent magnet can be accurately tested. The operation is simple, and the nut-screw structure is adopted to achieve labor-saving operation through a large reduction ratio; the lower connecting member adopts a forward and reverse screw thread design, making the disassembly and assembly of the permanent magnet more convenient and fast, and the test efficiency is high; through the structural design of the bulletproof slider, it is avoided that the permanent magnet acts instantaneously when the magnetic field lines are cut off, causing damage to the test equipment and affecting the test results; according to the test results, the actual force value of the permanent magnet can be evaluated and judged, ensuring the reliability of the opening and closing actions of the operating mechanism. Description of the Drawings

[0015] Figure 1 is the left view of the present invention.

[0016] Figure 2 is Figure 1 the sectional view taken along the A-A section in

[0017] Figure 3 State diagram of the present invention before starting to operate after installing a permanent magnet.

[0018] Figure 4 State diagram of the present invention after operating after installing a permanent magnet.

[0019] In the figure: 1. Bracket; 11. Base plate; 111. Through hole; 12. Support column; 13. Top plate; 2. Lead screw; 3. Handwheel; 4. Bulletproof slider; 41. Bulletproof cavity; 42. Upper cover; 43. Lower cover; 44. Upper jack; 45. Lower jack; 46. Thrust bearing; 47. Nut; 5. Guide sleeve; 6. Upper connecting piece; 61. Head; 62. Connecting rod; 7. Sensing module; 8. Lower connecting piece; 81. First threaded section; 82. Second threaded section; 9. Sensor; 91. Mounting plate; 10. Permanent magnet. Specific embodiments

[0020] The following combines with the drawings to illustrate the specific embodiments of the present invention.

[0021] As Figure 1 、 Figure 2 shown, the present invention includes a bracket 1, a lead screw 2, a handwheel 3, a bulletproof slider 4, a guide sleeve 5, a sensing module 7 and a sensor 9. The bracket 1 includes a base plate 11, a plurality of support columns 12 and a top plate 13, and the plurality of support columns 12 are vertically supported between the base plate 11 and the top plate 13. A through hole 111 is opened on the base plate 11. During the test, the permanent magnet 10 passes through the through hole 111 (refer to Figure 3 、 Figure 4 ). The lead screw 2 is vertically penetrated through the top plate 13, the handwheel 3 is fixedly connected to the top end of the lead screw 2, the bulletproof slider 4 is connected to the bottom end of the lead screw 2, and by rotating the handwheel 3, the lead screw 2 can be driven to move up and down, thereby driving the bulletproof slider 4 to move up and down. The guide sleeve 5 is sleeved outside the bulletproof slider 4 and is in clearance fit with the bulletproof slider 4. The guide sleeve 5 is fixed on the top plate 13. The guide sleeve 5 can guide the bulletproof slider 4 to move up and down in the vertical direction, prevent the bulletproof slider 4 from rotating, and ensure the accuracy of the test. The sensing module 7 is connected to the bulletproof slider 4 through the upper connecting piece 6, and a lower connecting piece 8 is connected to the bottom of the sensing module 7. During the test, the lower connecting piece 8 is connected to the permanent magnet 10 (refer to Figure 3 、 Figure 4 ). The sensing module 7 is connected to the sensor 9 through a circuit, the sensor 9 is fixed on the bracket 1 through the mounting plate 91, and the force value measured by the sensing module 7 is displayed in real time through the sensor 9.

[0022] As Figure 2As shown, a bulletproof cavity 41 is formed in the bulletproof slider 4. The top of the bulletproof cavity 41 is covered with an upper cover 42, and the bottom is covered with a lower cover 43. An upper jack 44 is formed in the upper cover 42, and a lower jack 45 is formed in the lower cover 43. The lower end of the lead screw 2 passes through the upper jack 44 and extends into the bulletproof cavity 41 of the bulletproof slider 4. The aperture of the upper jack 44 is larger than the rod diameter of the lower end of the lead screw 2. The lead screw 2 is in clearance fit with the bulletproof slider 4. A thrust bearing 46 and a nut 47 are sleeved on the rod part of the lead screw 2 that penetrates into the bulletproof cavity 41. The bulletproof slider 4 is limited on the lead screw 2 by the thrust bearing 46 and the nut 47. When the lead screw 2 rotates and moves up and down, the thrust bearing 46 bears the radial force and rotational force transmitted by the lead screw 2, so that the thrust bearing 46 rotates and moves up and down together with the lead screw 2. The bulletproof slider 4 bears the axial supporting force transmitted by the thrust bearing 46 and is not subject to radial force and rotational force. Therefore, the bulletproof slider 4 can move up and down together with the lead screw 2, but does not rotate during the up and down movement, ensuring the stability and accuracy of the measurement. The thrust bearing 46 adopts a flat pressure thrust ball bearing, which makes the up and down movement of the bulletproof slider 4 smoother while bearing radial force and rotational force at the same time, ensuring the stability and accuracy of the test. The upper connecting piece 6 is a T-shaped piece, including a head 61 and a connecting rod 62. The upper connecting piece 6 is arranged on the lower cover 43 of the bulletproof slider 4. Its head 61 is located in the bulletproof cavity 41, and the connecting rod 62 passes through the lower jack 45 of the lower cover 43. The outer diameter of the head 61 is larger than the outer diameter of the lower jack 45. The connecting rod 62 is in clearance fit with the bulletproof slider 4. The connecting rod 62 can move up and down along the lower jack 45. The bottom end of the connecting rod 62 is connected to the sensing module 7. When the pulling force of the upper connecting piece 6 on the permanent magnet 10 is greater than the closing holding force of the permanent magnet 10, the permanent magnet 10 is pulled open. After the upper connecting piece 6 unloads the force, it will rebound upward along the lower jack 45 by a certain height. When the upper connecting piece 6 is in the natural state, under the action of gravity, the bottom surface of its head 61 abuts against the lower cover 43 of the bulletproof slider 4. At this time, there is a height distance H1 between the top surface of the head 61 and the bottom surface of the lead screw 2. This height distance H1 is greater than the rebound height of the upper connecting piece 6, leaving enough safe rebound space for the upper connecting piece 6 to prevent the upper connecting piece 6 from colliding with the lead screw 2 when it rebounds. There is a height distance H2 between the top surface of the sensing module 7 and the bottom surface of the lower cover 43. This height distance H2 is greater than the rebound height of the sensing module 7, leaving enough safe rebound space for the sensing module 7 to prevent the sensing module 7 from colliding with the bulletproof slider 4 when the upper connecting piece 6 drives the sensing module 7 to rebound. The lead screw 2 and the bulletproof slider 4, as well as the upper connecting piece 6 and the bulletproof slider 4, are all in clearance fit. During the process of pulling up the lead screw 2, the loss of force at the mating parts of the bulletproof slider 4 with the lead screw 2 and the upper connecting piece 6 is reduced, making the test value more accurate; it also effectively prevents the jamming situation between parts that may occur when they are not accurately concentric during installation.

[0023] As Figure 1 , Figure 2 shown, the sensing module 7 is an S-shaped sensing component.

[0024] As shown Figure 2 in the figure, the lower connecting piece 8 adopts a double-thread reverse-threaded sleeve. A first thread section 81 and a second thread section 82 are provided in the threaded hole in the center thereof. The threads of the first thread section 81 and the second thread section 82 are in reverse directions. The first thread section 81 is a reverse thread, and the second thread section 82 is a positive thread. The first thread section 81 is connected to the sensing module 7 through a connecting piece, and the second thread section 82 is connected to the permanent magnet 10. The lower connecting piece 8 adopting a double-thread reverse-threaded sleeve can realize the simultaneous tightening or simultaneous loosening of the sensing module 7 and the permanent magnet 10. It is not only more convenient for disassembly and assembly, has high test efficiency, but also has more reliable installation force on both sides during testing, and has strong replaceability. Different sizes and specifications of double-thread reverse-threaded sleeves can be replaced according to permanent magnets 10 of different heights. Thread locking glue, flat washers and spring washers are used in combination to prevent loosening at the threaded joints at both the upper and lower ends of the sensing module 7, avoiding possible deviation situations that may occur when measuring force up and down on the sensing module 7, and making the test value more stable and reliable.

[0025] The present invention tests the permanent magnet 10 in the closing state. Whether the permanent magnet 10 after closing is in the energized state or the de-energized state, the closing holding force test can be carried out; the permanent magnet 10 in the closing state is subjected to: the force of the internal opening spring therein, the force of the bottom insulating pull rod, the self-closing force of the bulb itself, and the force that makes the permanent magnets 10 attract each other. These forces act on the permanent magnet 10 simultaneously. The force that makes the permanent magnets 10 attract each other is the closing holding force to be tested. During the test, as Figure 3 shown in the figure, the upper part of the permanent magnet 10 in the closing state passes through the through hole 111 of the bottom plate 11 and is connected to the lower connecting piece 8; after the permanent magnet 10 is connected, the handwheel 3 is rotated to drive the lead screw 2 to move upward. The lead screw 2 transmits the pulling force to the permanent magnet 10 through the bulletproof slider 4, the upper connecting piece 6, the sensing module 7, and the lower connecting piece 8 in sequence. The sensing module 7 transmits the pulling force value to the sensor 9, and the real-time force value of the upward pull is displayed on the sensor 9; as Figure 4 shown in the figure, when the permanent magnet 10 is pulled apart, the force value displayed by the sensor 9 at this time is the peak value of the closing holding force of the permanent magnet 10.

[0026] The structure of the present invention is simple. After the permanent magnet 10 is connected to the lower connecting piece 8, as long as the handwheel 3 is rotated, the accurate test of the closing holding force of the permanent magnet 10 can be realized. The operation is simple, and the lead screw 2 structure is adopted to achieve labor-saving operation through a large reduction ratio; the lower connecting piece 8 adopts a positive and reverse thread design, making the disassembly and assembly of the permanent magnet 10 more convenient and fast, and the test efficiency is high; through the structural design of the bulletproof slider 4, it is avoided that the permanent magnet 10 acts instantaneously when the magnetic field lines are cut off, causing damage to the test equipment and affecting the test results; according to the test results, the actual force value of the permanent magnet 10 can be evaluated and judged, ensuring the reliability of the opening and closing actions of the operating mechanism.

[0027] The above description is an explanation of the present invention, not a limitation thereof. Without departing from the spirit of the present invention, the present invention may be modified in any form.

Claims

1. A permanent magnet mechanism closing holding force detection device, characterized in that: A screw rod (2) is vertically arranged on the bracket (1); one end of the screw rod (2) is connected to a hand wheel (3) and the other end is connected to a bulletproof slider (4); an upper connecting piece (6) is inserted on the bulletproof slider (4); a sensor module (7) is connected to the upper connecting piece (6); a lower connecting piece (8) is connected to the sensor module (7); and the sensor module (7) is connected to a sensor (9) via a line; during testing, a permanent magnet (10) is connected to the lower connecting piece (8), and the hand wheel (3) is rotated to drive the screw rod (2) to move upward, so that the closing holding force of the permanent magnet (10) can be detected.

2. The permanent magnet mechanism closing holding force detection device according to claim 1, characterized in that: The outer sleeve of the bulletproof slider (4) is provided with a guide sleeve (5), the guide sleeve (5) and the bulletproof slider (4) are clearance-matched, and the guide sleeve (5) is fixed on the bracket (1).

3. The permanent magnet mechanism closing holding force detection device according to claim 1, characterized in that: The bulletproof slider (4) is provided with a bulletproof cavity (41), the lower end of the screw rod (2) extends into the bulletproof cavity (41) of the bulletproof slider (4), the screw rod (2) and the bulletproof slider (4) are clearance-matched, and a thrust bearing (46) and a nut (47) are sleeved on the rod portion of the screw rod (2) that penetrates into the bulletproof cavity (41); the thrust bearing (46) is a plane pressure thrust ball bearing.

4. The permanent magnet mechanism closing holding force detection device according to claim 1, characterized in that: The upper connecting member (6) is inserted into the bulletproof slider (4), the connecting rod (62) is clearance-matched with the bulletproof slider (4), the upper connecting member (6) comprises a head (61) and a connecting rod (62), the head (61) is located in the bulletproof cavity (41), the connecting rod (62) is inserted through a lower plug hole (45) of the lower cover (43), the connecting rod (62) can move up and down along the lower plug hole (45), and the sensor module (7) is connected to the bottom end of the connecting rod (62).

5. The permanent magnet mechanism closing holding force detection device according to claim 1, characterized in that: In the natural state, a height distance H1 between the top surface of the upper connecting member (6) and the bottom surface of the screw rod (2) is greater than the rebound height of the upper connecting member (6), and a height distance H2 between the top surface of the sensor module (7) and the bottom surface of the bulletproof slider (4) is greater than the rebound height of the sensor module (7).

6. The permanent magnet mechanism closing holding force detection device according to claim 1, characterized in that: The lower connecting member (8) adopts a double-thread reverse threaded sleeve, the threaded hole of which is provided with a first threaded section (81) and a second threaded section (82), the threads of the first threaded section (81) and the second threaded section (82) are in opposite directions, the first threaded section (81) is a reverse thread, and the second threaded section (82) is a normal thread, the first threaded section (81) is connected to the sensor module (7) through the connecting member, and the second threaded section (82) is connected to the permanent magnet (10).

7. The permanent magnet mechanism closing holding force detection device according to claim 1, characterized in that: The sensor module (7) is an S-shaped sensor component; threaded connections at both ends of the sensor module (7) are secured against loosening by using a threaded fastening adhesive, a flat washer, and a spring washer combination.

8. The permanent magnet mechanism closing holding force detection device according to claim 1, characterized in that: The bracket (1) comprises a bottom plate (11), a plurality of support columns (12), and a top plate (13); the plurality of support columns (12) are vertically supported between the bottom plate (11) and the top plate (13); a through hole (111) is provided on the bottom plate (11); during testing, the permanent magnet (10) passes through the through hole (111); the screw rod (2) is vertically passed through the top plate (13); the hand wheel (3) is fixedly connected to the top end of the screw rod (2); and the bulletproof slider (4) is fixedly connected to the bottom end of the screw rod (2); and the sensor (9) is fixed to the bracket (1) via a mounting plate (91).

9. A method for testing the closing holding force of a permanent magnet mechanism, characterized in that: The permanent magnet mechanism closing holding force detection device described in claim 1 is used to test the permanent magnet (10) in the closed state. During the test, the permanent magnet (10) in the closed state is connected to the lower connecting piece (8), and the handwheel (3) is rotated to pull the permanent magnet (10) upward through the screw (2). The force value at the moment when the permanent magnet (10) is pulled apart is the closing holding force peak value.

10. The method for testing the closing holding force of a magnetic mechanism according to claim 9, characterized in that: After the switch is closed, the permanent magnet (10) can be tested for its closing holding force in either a power-on state or a power-off state.

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