Device for detecting closing retention force of permanent magnetic mechanism

Abstract

The utility model discloses a permanent magnetic mechanism closing retention force detection device. 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, a lower connecting piece is connected to the sensing module, and the sensing module is connected with a 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. According to the utility model, the structure is simple, the operation is simple, the labor-saving operation is realized through a large reduction ratio by adopting a nut-screw rod structure, the actual force value of the permanent magnet can be evaluated and judged according to the test result, and the reliability of the switching-on and switching-off actions of the operating mechanism is ensured.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage permanent magnet switch mechanism testing technology, and in particular to a device for testing the closing holding force of a permanent magnet mechanism. Background Technology

[0002] High-voltage permanent magnet switch mechanisms, as a solution for high-voltage switches, are widely used in power distribution systems to achieve the closing and opening of high-voltage switches. The magnitude of the permanent magnet's holding force determines the reliability of the closing action of the operating mechanism. To ensure the reliability of closing, the holding force of the permanent magnet must meet certain force requirements. Currently, there is no readily available and feasible equipment for testing the holding force of permanent magnet mechanisms in the industry. The holding force of the permanent magnet can usually only be obtained theoretically through force analysis calculations, but the actual holding force of the permanent magnet cannot be effectively measured. Therefore, an accurate assessment of the true holding force of the permanent magnet cannot be made. Utility Model Content

[0003] In response to the lack of existing permanent magnet testing equipment, the applicant provides a reasonably structured permanent magnet mechanism closing and holding force testing device, which accurately measures the actual closing and holding force of the permanent magnet. It has a simple structure, is easy to operate, and has high testing efficiency.

[0004] The technical solution adopted in this utility model is as follows:

[0005] A device for detecting the closing and holding force of a permanent magnet mechanism includes a lead screw vertically mounted on a support. One end of the lead screw is connected to a handwheel, and the other end is connected to a bulletproof slider. An upper connector is inserted into the bulletproof slider, and a sensing module is connected to the upper connector. A lower connector is connected to the sensing module, and the sensing module is connected to a sensor via a circuit. During testing, the permanent magnet is connected to the lower connector, and rotating the handwheel drives the lead screw to move upward, thereby detecting the closing and holding force of the permanent magnet.

[0006] As a further improvement to the above technical solution:

[0007] The bulletproof slider is fitted with a guide sleeve, which is clearance-fitted to the bulletproof slider and fixed to the bracket.

[0008] The bulletproof slider has a bulletproof cavity, and the lower end of the lead screw extends into the bulletproof cavity of the bulletproof slider. The lead screw and the bulletproof slider are clearance-fitted. A thrust bearing and a nut are sleeved on the part of the lead screw that passes through the bulletproof cavity. The thrust bearing is a planar pressure thrust ball bearing.

[0009] The upper connector is mounted on the bulletproof slider. The connecting rod is clearance-fitted with the bulletproof slider. The upper connector includes a head and a connecting rod. The head is located inside the bulletproof cavity. The connecting rod passes through the lower insertion hole of the lower cover and can move up and down along the lower insertion hole. The sensing module is connected to the bottom of the connecting rod.

[0010] In its natural state, the height distance H1 between the top surface of the upper connector and the bottom surface of the lead screw is greater than the rebound height of the upper connector, 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.

[0011] The lower connector adopts a double-threaded reverse threaded sleeve, with a first threaded section and a second threaded section in its threaded hole. The threads of the first threaded section and the second threaded section are opposite, with the first threaded section being a reverse thread and the second threaded section being a forward thread. The first threaded section is connected to the sensing module through the connector, and the second threaded section is connected to the permanent magnet.

[0012] The sensing module is an S-shaped sensing component; the threaded connections at both ends of the sensing module are secured with a combination of thread-fastening adhesive, flat washers, and spring washers to prevent loosening.

[0013] The support frame includes a base plate, several support columns, and a top plate. The support columns are vertically supported between the base plate and the top plate. The base plate has through holes through which the permanent magnet passes during testing. The lead screw is vertically mounted on the top plate, with a handwheel fixedly connected to the top of the lead screw and a bulletproof slider fixedly connected to the bottom of the lead screw. The sensor is fixed to the support frame via a mounting plate.

[0014] The beneficial effects of this utility model are as follows:

[0015] This invention features a simple structure. After the permanent magnet is connected to the lower connector, the closing and holding force of the permanent magnet can be accurately tested simply by turning the handwheel. The operation is simple, and the use of a nut and screw structure with a large reduction ratio achieves labor-saving operation. The lower connector adopts a forward and reverse thread design, making the disassembly and assembly of the permanent magnet more convenient and quick, and improving testing efficiency. The design of the bulletproof slider avoids damage to the testing equipment and impact on the test results caused by the permanent magnet's movement at the moment of magnetic field line cut. Based on 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. Attached Figure Description

[0016] Figure 1 This is the left view of the present invention.

[0017] Figure 2 for Figure 1 A sectional view of section AA in the middle.

[0018] Figure 3 This is a diagram showing the state of this utility model before it starts operating after the permanent magnet is installed.

[0019] Figure 4 This is a diagram showing the state of the present invention after it has been fitted with a permanent magnet and is in operation.

[0020] In the diagram: 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. Top cover; 43. Bottom cover; 44. Upper insertion hole; 45. Lower insertion hole; 46. Thrust bearing; 47. Nut; 5. Guide sleeve; 6. Upper connector; 61. Head; 62. Connecting rod; 7. Sensor module; 8. Lower connector; 81. First threaded section; 82. Second threaded section; 9. Sensor; 91. Mounting plate; 10. Permanent magnet. Detailed Implementation

[0021] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0022] like Figure 1 , Figure 2 As shown, this utility model 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, several support columns 12, and a top plate 13. The support columns 12 are vertically supported between the base plate 11 and the top plate 13. A through hole 111 is provided on the base plate 11. During testing, the permanent magnet 10 passes through the through hole 111 (see reference). Figure 3 , Figure 4 A lead screw 2 is vertically mounted on the top plate 13. A handwheel 3 is fixedly connected to the top of the lead screw 2, and a bulletproof slider 4 is connected to the bottom of the lead screw 2. Rotating the handwheel 3 drives the lead screw 2 to move up and down, thereby causing the bulletproof slider 4 to move up and down. A guide sleeve 5 is fitted over the bulletproof slider 4 with a clearance fit. The guide sleeve 5 is fixed to the top plate 13 and guides the bulletproof slider 4 to move up and down vertically, preventing the bulletproof slider 4 from rotating and ensuring the accuracy of the test. The sensor module 7 is connected to the bulletproof slider 4 via an upper connector 6. A lower connector 8 is connected to the bottom of the sensor module 7. During testing, the lower connector 8 is connected to the permanent magnet 10 (see reference). Figure 3 , Figure 4 The sensing module 7 is connected to the sensor 9 via a line. The sensor 9 is fixed to the bracket 1 via a mounting plate 91. The force value measured by the sensing module 7 is displayed in real time by the sensor 9.

[0023] like Figure 2As shown, the bulletproof slider 4 has a bulletproof cavity 41. The top of the bulletproof cavity 41 is covered with an upper cover 42 and the bottom is covered with a lower cover 43. The upper cover 42 has an upper insertion hole 44 and the lower cover 43 has a lower insertion hole 45. The lower end of the lead screw 2 passes through the upper insertion hole 44 and extends into the bulletproof cavity 41 of the bulletproof slider 4. The diameter of the upper insertion hole 44 is larger than the diameter of the lower end of the lead screw 2. The lead screw 2 and the bulletproof slider 4 are clearance-fitted. A thrust bearing 46 and a nut 47 are fitted on the part of the lead screw 2 that passes through the bulletproof cavity 41. The bulletproof slider 4 is fixed to 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 from the lead screw 2, causing the thrust bearing 46 to rotate and move up and down with the lead screw 2. The bulletproof slider 4 bears the axial support force transmitted from the thrust bearing 46 and is not subjected to radial force or rotational force. Therefore, the bulletproof slider 4 can move up and down 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 is a planar pressure thrust ball bearing, which, while bearing both radial force and rotational force, makes the up and down movement of the bulletproof slider 4 smoother, ensuring the stability and accuracy of the test. The upper connector 6 is a T-shaped part, including a head 61 and a connecting rod 62. The upper connector 6 is installed on the lower cover 43 of the bulletproof slider 4, with its head 61 located inside the bulletproof cavity 41. The connecting rod 62 extends out from the lower insertion hole 45 of the lower cover 43. The outer diameter of the head 61 is larger than the outer diameter of the lower insertion hole 45. The connecting rod 62 is clearance-fitted with the bulletproof slider 4. The connecting rod 62 can move up and down along the lower insertion hole 45. The bottom end of the connecting rod 62 is connected to the sensing module 7. When the pulling force of the upper connector 6 on the permanent magnet 10 is greater than the closing holding force of the permanent magnet 10, the permanent magnet 10 is pulled away. After the upper connector 6 is relieved of the force, it will rebound upwards a certain height along the lower insertion hole 45. When the upper connector 6 is in its natural state, under the action of gravity, the bottom surface of its head 61 rests 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 connector 6, providing sufficient safe rebound space for the upper connector 6 and preventing the upper connector 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, providing sufficient safe rebound space for the sensing module 7 and preventing the sensing module 7 from colliding with the bulletproof slider 4 when the upper connector 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 clearance fits. During the pulling process of the lead screw 2, the force loss at the mating parts of the bulletproof slider 4, the lead screw 2, and the upper connecting piece 6 is reduced, making the test value more accurate. It also effectively prevents the jamming between parts that may occur when the parts are not accurately concentric during installation.

[0024] like Figure 1 , Figure 2 As shown, sensing module 7 is an S-shaped sensing component.

[0025] like Figure 2 As shown, the lower connector 8 uses a double-threaded reverse-pitch sleeve. Its central threaded hole has 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 opposite; the first threaded section 81 is a reverse thread, and the second threaded section 82 is a forward thread. The first threaded section 81 is connected to the sensor module 7 via a connector, and the second threaded section 82 is connected to the permanent magnet 10. The use of a double-threaded reverse-pitch sleeve in the lower connector 8 allows for simultaneous tightening or loosening of the sensor module 7 and the permanent magnet 10. This not only makes disassembly and assembly more convenient and improves testing efficiency, but also ensures more reliable force distribution on both sides during testing. Furthermore, it offers high replaceability, allowing for the replacement of double-threaded reverse-pitch sleeves of different sizes to accommodate permanent magnets 10 of varying heights. Both ends of the sensor module 7 use a combination of thread-locking adhesive, flat washers, and spring washers to prevent loosening, avoiding potential deviations during force measurement and ensuring more stable and reliable test values.

[0026] This invention tests the permanent magnet 10 in the closed state. Regardless of whether the permanent magnet 10 is energized or de-energized after closing, the closing holding force can be tested. The permanent magnet 10 in the closed state is subjected to: the force of its internal opening spring, the force of the bottom insulating rod, the self-closing force of the bulb itself, and the force that attracts the permanent magnet 10 together. These forces act simultaneously on the permanent magnet 10, and the force that attracts the permanent magnet 10 together is the closing holding force to be tested. During the test, if... Figure 3 As shown, the upper part of the permanent magnet 10 in the closed state passes through the through hole 111 of the base plate 11, connecting the permanent magnet 10 to the lower connector 8. After the permanent magnet 10 is connected, rotating the handwheel 3 drives 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 connector 6, the sensing module 7, and the lower connector 8 in sequence. The sensing module 7 transmits the pulling force value to the sensor 9, and the sensor 9 displays the real-time upward force value. Figure 4 As shown, 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.

[0027] This utility model has a simple structure. After the permanent magnet 10 is connected to the lower connector 8, the closing holding force of the permanent magnet 10 can be accurately tested simply by rotating the handwheel 3. The operation is simple, and the use of the lead screw 2 structure with a large reduction ratio achieves labor-saving operation. The lower connector 8 adopts a forward and reverse thread design, which makes the disassembly and assembly of the permanent magnet 10 more convenient and quick, and the testing efficiency is high. The structure design of the bulletproof slider 4 avoids damage to the testing equipment and the impact on the test results caused by the moment the permanent magnet 10 moves when the magnetic lines of force are cut. Based on 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.

[0028] The above description is an explanation of the present utility model and not a limitation thereof. The present utility model can be modified in any form without departing from its spirit.

Claims

1. A device for detecting the closing holding force of a permanent magnet mechanism, characterized in that: The bracket (1) is vertically provided with a lead screw (2), one end of the lead screw (2) is connected with a hand wheel (3), the other end is connected with a bulletproof sliding block (4), the bulletproof sliding block (4) is inserted with an upper connecting piece (6), a sensing module (7) is connected to the upper connecting piece (6), the sensing module (7) is connected with a lower connecting piece (8), the sensing module (7) is connected with a sensor (9) through a wire; during testing, a permanent magnet (10) is connected to the lower connecting piece (8), the hand wheel (3) is rotated to drive the lead screw (2) to move upward, so that the closing holding force of the permanent magnet (10) can be detected.

2. The permanent magnet mechanism closing force detection device according to claim 1, characterized by: The bulletproof sliding block (4) is externally provided with a guide sleeve (5), the guide sleeve (5) is in clearance fit with the bulletproof sliding block (4), and the guide sleeve (5) is fixed on the bracket (1).

3. The apparatus for detecting the closing force of the permanent magnet mechanism according to claim 1, characterized in that: The bulletproof sliding block (4) is provided with a bulletproof cavity (41), the lower end of the lead screw (2) extends into the bulletproof cavity (41) of the bulletproof sliding block (4), the lead screw (2) is in clearance fit with the bulletproof sliding block (4), and the rod part of the lead screw (2) penetrating into the bulletproof cavity (41) is externally provided with a thrust bearing (46) and a nut (47); the thrust bearing (46) is a plane pressure thrust ball bearing.

4. The permanent magnet mechanism closing force detection device according to claim 1, characterized by: The upper connecting piece (6) is provided on the bulletproof sliding block (4), a connecting rod (62) is in clearance fit with the bulletproof sliding block (4), the upper connecting piece (6) comprises a head (61) and the connecting rod (62), the head (61) is located in the bulletproof cavity (41), the connecting rod (62) penetrates out of a lower insertion hole (45) of a lower cover (43), the connecting rod (62) can move up and down along the lower insertion hole (45), and the sensing module (7) is connected to the bottom end of the connecting rod (62).

5. The apparatus for detecting closing force of a permanent magnet mechanism according to claim 1, characterized by: In a natural state, the height difference H1 between the top surface of the upper connecting piece (6) and the bottom surface of the lead screw (2) is greater than the rebound height of the upper connecting piece (6), and the height difference H2 between the top surface of the sensing module (7) and the bottom surface of the bulletproof sliding block (4) is greater than the rebound height of the sensing module (7).

6. The permanent magnet mechanism closing force detection device according to claim 1, characterized by: The lower connecting piece (8) is a double-thread reverse tooth screw sleeve, a threaded hole of the lower connecting piece (8) is provided with a first threaded section (81) and a second threaded section (82), the first threaded section (81) and the second threaded section (82) are reverse threaded, the first threaded section (81) is reverse threaded, the second threaded section (82) is positively threaded, the first threaded section (81) is connected with the sensing module (7) through a connecting piece, and the second threaded section (82) is connected with the permanent magnet (10).

7. The apparatus for detecting closing force of a permanent magnet mechanism according to claim 1, characterized by: The sensing module (7) is an S-shaped sensing component; the sensing module (7) is provided with a threaded fastening glue at both ends, and a flat gasket and an elastic gasket are combined to prevent loosening.

8. The permanent magnet mechanism closing force detection device according to claim 1, characterized by: 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), the bottom plate (11) is provided with a through hole (111), the permanent magnet (10) penetrates through the through hole (111) during testing, the lead screw (2) is vertically provided on the top plate (13), the hand wheel (3) is fixedly connected to the top end of the lead screw (2), and the bulletproof sliding block (4) is fixedly connected to the bottom end of the lead screw (2); the sensor (9) is fixed on the bracket (1) through a mounting plate (91).

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