A device fixing base that is convenient for disassembly and assembly

Abstract

A device fixing seat that is convenient for disassembly and assembly, including a base. A first chamber, a second chamber, and a third chamber are provided on the base. A driving device is provided in the third chamber. A first actuating device, a first flexible magnetic field shielding cover, and a first magnet are provided in the first chamber. A second actuating device, a second flexible magnetic field shielding cover, and a second magnet are provided in the second chamber. The driving device can simultaneously drive the first actuating device and the second actuating device to stretch and compress the first flexible magnetic field shielding cover and the second flexible magnetic field shielding cover respectively, so as to surround or expose the first magnet and the second magnet, shield or expose the magnetic field of the magnets, thereby generating non-attraction or attraction to the steel plate below, and further facilitating the disassembly and installation of the fixing seat, which is convenient to use.

Description

Technical Field

[0001] The present invention specifically relates to a device fixing seat that is convenient for disassembly and assembly, belonging to the technical field of device fixing methods. Background Art

[0002] For various devices in the prior art, in order to ensure their stability, various fixing methods are usually adopted, such as using anchor expansion bolts, welding, gluing and other forms. However, these methods are not convenient for the disassembly and assembly of the device and are not convenient for the movement of the device. Summary of the Invention

[0003] Aiming at the problems existing in the prior art, the present invention provides a device fixing seat that is convenient for disassembly and assembly, aiming to solve the problem that the existing device fixing methods are not convenient for installation and disassembly.

[0004] The technical solution of the present invention is: a device fixing seat that is convenient for disassembly and assembly, including a base, on which a first chamber, a second chamber and a third chamber are provided. The first chamber and the second chamber are located on both sides of the third chamber, and the first chamber and the second chamber form a 90-degree angle; a driving device is provided in the third chamber, a first actuating device, a first flexible magnetic field shielding cover and a first magnet are provided in the first chamber, a second actuating device, a second flexible magnetic field shielding cover and a second magnet are provided in the second chamber. The driving device can simultaneously drive the first actuating device and the second actuating device to stretch and compress the first flexible magnetic field shielding cover and the second flexible magnetic field shielding cover respectively; when the magnetic field shielding cover is in a fully stretched state, the magnetic field shielding cover surrounds the corresponding magnet inside it, and when the magnetic field shielding cover is in a fully compressed state, the corresponding magnet is completely exposed outside the magnetic field shielding cover.

[0005] Further, the driving device includes a worm gear, a worm, a first transmission shaft, and a second transmission shaft. The axis of the worm is perpendicular to the base, the first transmission shaft and the second transmission shaft are both parallel to the base plane, and the first transmission shaft is perpendicular to the second transmission shaft. A worm gear is fixedly connected to the first transmission shaft, and the worm gear is in mating connection with the worm. A first bevel gear and a second bevel gear are respectively fixedly provided at both ends of the first transmission shaft, a third bevel gear and a fourth bevel gear are respectively fixedly provided at both ends of the second transmission shaft, and the first transmission shaft and the second transmission shaft are in mating connection through the second bevel gear and the third bevel gear.

[0006] Further, the first execution device includes a first lead screw, a second lead screw, a first guide rod, a second guide rod, and a first push plate that are arranged in parallel; one ends of the first lead screw and the second lead screw both pass through the side wall of the third chamber and extend into the third chamber, and a fifth bevel gear and a sixth bevel gear are respectively fixedly arranged at their end portions. The other ends of the first lead screw and the second lead screw are both rotatably connected to the side wall of the first chamber. A plurality of nut sliders are sleeved on both the first lead screw and the second lead screw, and the nut sliders are all connected to the first flexible magnetic field shielding cover; both ends of the first guide rod and the second guide rod are respectively fixed on the side wall of the third chamber and the side wall of the first chamber. A plurality of slip rings are sleeved on both the first guide rod and the second guide rod, and the slip rings are all connected to the first flexible magnetic field shielding cover; the first lead screw, the second lead screw, the first guide rod, and the second guide rod all vertically pass through the first push plate, and the first push plate is fixedly connected to the nut slider closest to the third chamber on the first lead screw and the second lead screw, and the first push plate is fixedly connected to the slip ring closest to the third chamber on the first guide rod and the second guide rod; the first flexible magnetic field shielding cover is in the shape of a pocket with a square cross-section under the constraint of the first lead screw, the second lead screw, the first guide rod, and the second guide rod. The fixed end of the first flexible magnetic field shielding cover is fixedly connected to the side wall of the first chamber, and the movable end of the first flexible magnetic field shielding cover is connected to the first push plate; the first magnet is arranged at the center of the first flexible magnetic field shielding cover, and both ends of the first magnet are respectively fixedly connected to the side wall of the first chamber and the side wall of the third chamber through top columns. A first through hole is arranged at the center of the first push plate, and the first through hole allows the top column and the magnet to pass through freely.

[0007] Further, the first bevel gear is in mating connection with the fifth bevel gear, and the second bevel gear is in mating connection with the sixth bevel gear.

[0008] Further, the second actuator includes a third lead screw, a fourth lead screw, a third guide rod, a fourth guide rod, and a second push plate that are arranged in parallel; one ends of the third lead screw and the fourth lead screw both pass through the side wall of the third chamber and extend into the third chamber, and a second bevel gear and a seventh bevel gear are respectively fixedly arranged at their end portions. The third lead screw is coaxially and fixedly connected to the first transmission shaft in the third chamber through the second bevel gear. The other ends of the third lead screw and the fourth lead screw are both rotatably connected to the side wall of the second chamber. A plurality of nut sliders are sleeved on both the third lead screw and the fourth lead screw, and the nut sliders are all connected to the second flexible magnetic field shielding cover; both ends of the third guide rod and the fourth guide rod are respectively fixed on the side wall of the third chamber and the side wall of the second chamber. A plurality of slip rings are sleeved on both the third guide rod and the fourth guide rod, and the slip rings are all connected to the second flexible magnetic field shielding cover; the third lead screw, the fourth lead screw, the third guide rod, and the fourth guide rod all vertically pass through the second push plate, and the second push plate is fixedly connected to the nut slider closest to the third chamber on the third lead screw and the fourth lead screw, and the second push plate is fixedly connected to the slip ring closest to the third chamber on the third guide rod and the fourth guide rod; the second flexible magnetic field shielding cover is in the shape of a pocket with a square cross-section under the constraint of the third lead screw, the fourth lead screw, the third guide rod, and the fourth guide rod. The fixed end of the second flexible magnetic field shielding cover is fixedly connected to the side wall of the second chamber, and the movable end of the second flexible magnetic field shielding cover is connected to the second push plate; the second magnet is arranged at the center of the second flexible magnetic field shielding cover, and both ends of the second magnet are respectively fixedly connected to the side wall of the second chamber and the side wall of the third chamber through the top columns. A second through hole is arranged at the center of the second push plate, and the second through hole allows the top columns and the magnet to pass through freely.

[0009] Further, the fourth bevel gear is in mating connection with the seventh bevel gear.

[0010] Further, the first magnet and the second magnet are bar magnets, and the upper and lower surfaces of the bar magnet are respectively the two poles of the magnet.

[0011] Further, an L-shaped handle is further arranged at the top of the worm, and the handle is hinged to the worm through a pin shaft.

[0012] Further, upper covers are arranged on the first chamber, the second chamber, and the third chamber, and a handle hole is further arranged on the upper cover of the third chamber.

[0013] Beneficial effects: By rotating the handle of the present invention, the movement of the worm and worm gear drives the first transmission shaft to rotate. The first transmission shaft drives the second transmission shaft to rotate synchronously through bevel gears. At the same time, the first transmission shaft and the second transmission shaft drive the first lead screw, the second lead screw, the third lead screw, and the fourth lead screw to rotate synchronously through bevel gear transmission, and push the first push plate and the second push plate to perform compression or stretching movements on the first flexible magnetic field shielding cover and the second flexible magnetic field shielding cover. When the magnetic field shielding cover is completely compressed, the magnet inside it will be completely exposed, thereby generating a magnetic attraction on the steel plate under the base, making the fixed seat firmly fixed. When the magnetic field shielding cover is completely stretched, it will shield the magnetic field of the magnet inside it, causing the magnet to lose the magnetic attraction on the steel plate under the base, thereby facilitating the disassembly of the fixed seat. Therefore, the structure of the fixed seat of this device is ingeniously designed, facilitating the installation and disassembly of the fixed seat and being convenient to use. Description of the Drawings

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0015] Figure 2 It is a schematic diagram of the present invention after hiding the cover plate.

[0016] Figure 3 It is Figure 2 The top view of the [Figure number] after hiding the handle and the shielding cover.

[0017] Figure 4 It is Figure 3 The enlarged view of area A in the [Figure number].

[0018] Figure 5 It is an application scenario schematic diagram of the present invention.

[0019] Markings in the figure: 0 bottom plate, 1 first chamber, 2 second chamber, 3 third chamber, 4 fixed seat, 5 device, 6 steel plate, 101 cover plate, 102 side wall, 201 cover plate, 202 side wall, 301 cover plate, 302 handle hole;

[0020] 11 first lead screw, 12 second lead screw, 13 first guide rod, 14 second guide rod, 15 first flexible magnetic field shielding cover, 16 first push plate, 17 first magnet, 18 ejector pin, 19 ejector pin, 111 nut slider, 112 fifth bevel gear, 121 nut slider, 122 sixth bevel gear, 131 slip ring;

[0021] 21 third lead screw, 22 fourth lead screw, 23 third guide rod, 25 second flexible magnetic field shielding cover, 26 second push plate, 27 second magnet, 28 ejector pin, 29 ejector pin, 211 nut slider, 221 nut slider, 222 seventh bevel gear, 231 slip ring;

[0022] 31 L-shaped handle, 32 worm, 33 worm gear, 34 first transmission shaft, 35 second transmission shaft, 341 first bevel gear, 342 second bevel gear, 351 third bevel gear, 352 fourth bevel gear. Detailed implementation mode

[0023] The implementation of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0024] As Figures 1 - 3 shown, a device fixing seat that is convenient for disassembly and assembly includes a base 0. A first chamber 1, a second chamber 2 and a third chamber 3 are provided on the base 0. The first chamber 1 and the second chamber 2 are located on both sides of the third chamber 3. The first chamber 1 and the second chamber 2 form a 90-degree angle, and the overall fixing seat is L-shaped; a driving device is provided in the third chamber 3, a first actuating device, a first flexible magnetic field shielding cover 15 and a first magnet 17 are provided in the first chamber 1, and a second actuating device, a second flexible magnetic field shielding cover 25 and a second magnet 27 are provided in the second chamber 2; upper covers 101, 201, 301 are provided on the first chamber 1, the second chamber 2 and the third chamber 3 respectively. The upper covers of each chamber cover the components in each chamber. A handle hole 302 is also provided on the upper cover 301 of the third chamber.

[0025] As Figures 2 - 4 shown, the driving device in the third chamber 3 includes a worm gear 33, a worm 32, a first transmission shaft 34, and a second transmission shaft 35. The axis of the worm 32 is perpendicular to the base. An L-shaped handle 31 is also provided at the top of the worm. The handle is hinged to the worm through a pin shaft. After the handle is erected, the handle can be held to rotate the worm. After the handle is laid flat, the handle can be inserted into the handle hole 302. The first transmission shaft 34 and the second transmission shaft 35 are both parallel to the base plane. The first transmission shaft 35 is perpendicular to the second transmission shaft 35. A worm gear 33 is coaxially and fixedly connected to the first transmission shaft 34. The worm gear 33 is connected in cooperation with the worm 32. A first bevel gear 341 and a second bevel gear 342 are respectively and fixedly provided at both ends of the first transmission shaft 34. A third bevel gear 351 and a fourth bevel gear 352 are respectively and fixedly provided at both ends of the second transmission shaft 35. The first transmission shaft 34 and the second transmission shaft 35 are connected in meshing cooperation through the second bevel gear 342 and the third bevel gear 351. When the handle is rotated to drive the worm to rotate, the worm gear rotates, driving the first transmission shaft to rotate, and at the same time the second transmission shaft rotates synchronously.

[0026] As Figures 2 - 4As shown, the first actuating device in the first chamber 1 includes a first lead screw 11, a second lead screw 12, a first guide rod 13, a second guide rod 14, and a first push plate 16 that are arranged in parallel; the left ends of the first lead screw 11 and the second lead screw 12 both pass through the side wall of the third chamber 3 and extend into the third chamber, and a fifth bevel gear 112 and a sixth bevel gear 122 are respectively fixedly arranged at their ends. Moreover, the first bevel gear 341 is meshed and connected with the fifth bevel gear 112, and the second bevel gear 342 is meshed and connected with the sixth bevel gear 112. The right ends of the first lead screw 11 and the second lead screw 12 are both rotatably connected to the side wall 102 of the first chamber; a plurality of nut sliders 111 and 121 are coaxially sleeved on both the first lead screw 11 and the second lead screw 12, and the nut sliders are all connected to the first flexible magnetic field shielding cover 15; both ends of the first guide rod 13 and the second guide rod 14 are respectively fixed on the side wall of the third chamber and the side wall of the first chamber, and a plurality of slip rings 131 are sleeved on both the first guide rod and the second guide rod, and the slip rings are all connected to the first flexible magnetic field shielding cover 15; the first lead screw 11, the second lead screw 12, the first guide rod 13, and the second guide rod 14 all vertically pass through the first push plate 16, and the first push plate 16 is fixedly connected to the nut slider closest to the third chamber on the first lead screw and the second lead screw, and the first push plate is fixedly connected to the slip ring closest to the third chamber on the first guide rod and the second guide rod; the first flexible magnetic field shielding cover 15 is in the shape of a pocket with a square cross-section under the constraint of the first lead screw 11, the second lead screw 12, the first guide rod 13, and the second guide rod 14. The fixed end of the first flexible magnetic field shielding cover 15 is fixedly connected to the side wall 102 of the first chamber, and the movable end of the first flexible magnetic field shielding cover is connected to the first push plate 16; a first magnet 17 is arranged at the center of the first flexible magnetic field shielding cover 15, and both ends of the first magnet 17 are respectively fixedly connected to the side wall of the first chamber and the side wall of the third chamber through top columns 18 and 19. A first through hole is arranged at the center of the first push plate 16, and the through hole allows the top column and the magnet to pass through freely. When the first transmission shaft 34 drives the first lead screw 11 and the second lead screw 12 to rotate through bevel gears, the nut sliders on the lead screws and the first push plate move under the guidance of the guide rods, thereby stretching and compressing the first flexible magnetic field shielding cover 15. When the first flexible magnetic field shielding cover 15 is in the fully stretched state, the first magnet 17 can be surrounded by it. When the first flexible magnetic field shielding cover 15 is in the fully compressed state, the first magnet 17 is completely exposed outside the first flexible magnetic field shielding cover 15.

[0027] As Figures 2 - 4As shown, the second actuating device in the second chamber 2 includes a third lead screw 21, a fourth lead screw 22, a third guide rod 23, a fourth guide rod, and a second push plate 26 arranged in parallel; one ends of the third lead screw 21 and the fourth lead screw 22 both pass through the side wall of the third chamber 3 and extend into the third chamber, and a seventh bevel gear 222 is fixedly arranged at the end of the fourth lead screw 22. The end of the third lead screw 21 is coaxially and fixedly connected with the second bevel gear 342, that is, the third lead screw 21 is coaxially and fixedly connected with the first transmission shaft 34 in the third chamber through the second bevel gear. The seventh bevel gear 222 is meshed and connected with the fourth bevel gear 352. The other ends of the third lead screw 21 and the fourth lead screw 22 are both rotatably connected with the side wall 202 of the second chamber. A plurality of nut sliders 211 and 221 are sleeved on the third lead screw and the fourth lead screw respectively, and the nut sliders are all connected with the second flexible magnetic field shielding cover 25; both ends of the third guide rod 23 and the fourth guide rod are respectively fixed on the side wall of the third chamber and the side wall of the second chamber. A plurality of slip rings 231 are sleeved on the third guide rod and the fourth guide rod respectively, and the slip rings are all connected with the second flexible magnetic field shielding cover 25; the third lead screw 21, the fourth lead screw 22, the third guide rod 23, and the fourth guide rod all vertically pass through the second push plate 26, and the second push plate 26 is fixedly connected with the nut slider closest to the third chamber on the third lead screw and the fourth lead screw, and the second push plate is fixedly connected with the slip ring closest to the third chamber on the third guide rod and the fourth guide rod; the second flexible magnetic field shielding cover 25 is in the shape of a pocket with a square cross-section under the constraint of the third lead screw 21, the fourth lead screw 22, the third guide rod 23, and the fourth guide rod. The fixed end of the second flexible magnetic field shielding cover 25 is fixedly connected with the side wall 202 of the second chamber, and the movable end of the second flexible magnetic field shielding cover 25 is connected with the second push plate 26; the second magnet 27 is arranged at the center of the second flexible magnetic field shielding cover 25. Both ends of the second magnet 27 are respectively fixedly connected with the side wall of the second chamber and the side wall of the third chamber through the top columns 28 and 29. A second through hole is arranged at the center of the second push plate, and the second through hole allows the top columns and the second magnet to pass through freely. When the first transmission shaft 34 rotates, it drives the third lead screw 21 to rotate, and drives the second transmission shaft 35 and the fourth lead screw 22 to rotate synchronously through the bevel gears. The nut sliders on the lead screws and the second push plate move under the guidance of the guide rods, so as to stretch and compress the second flexible magnetic field shielding cover 25. When the second flexible magnetic field shielding cover 25 is in the fully stretched state, the second magnet 27 can be surrounded by it. When the second flexible magnetic field shielding cover 25 is in the fully compressed state, the second magnet 27 is completely exposed outside the second flexible magnetic field shielding cover 25.

[0028] The first and second magnets 17, 27 are both bar-shaped permanent magnets, with the upper and lower surfaces of the bar-shaped permanent magnets forming the north and south poles, respectively. The first and second flexible magnetic field shields 15, 25 are made of soft iron cloth, which has the soft magnetic properties of high magnetic permeability and low coercivity. The top posts 18, 19, 28, and 29 used to secure the magnets are made of a non-magnetic material.

[0029] The use scenario of the device fixing seat of the present invention is as follows Figure 5 As shown, before use, a steel plate 6 needs to be embedded and fixed directly below the fixing base 4 so that the magnetic force generated by the fixing base can attract the steel plate. Two fixing bases 4 can be used to clamp at two opposite corners of the device 5. Of course, fixing bases can also be placed at all four corners of the device. When the device and fixing base are in place, the handle in the third chamber of the fixing base is pulled out and rotated. The driving device in the third chamber simultaneously drives the first actuator in the first chamber and the second actuator in the second chamber to stretch or compress the first flexible magnetic field shield respectively. When the magnetic field shield is in a fully compressed state, the corresponding magnet is completely exposed outside the magnetic field shield. The magnet firmly attracts the steel plate below it through the base, thereby fixing the device. When the magnetic field shield is in a fully stretched state, the magnetic field shield surrounds the corresponding magnet inside it. At this time, the magnetic flux of the magnet passes through the magnetic field shield body, and the magnetic field of the magnet is shielded by the shield, unable to generate attraction to the steel plate below the fixing base. At this time, the fixing base can be easily moved, thereby facilitating the disassembly of the device.

Claims

1. A device fixing seat that is convenient for disassembly and assembly, characterized in that: It includes a base, on which a first chamber, a second chamber and a third chamber are provided. The first chamber and the second chamber are located on both sides of the third chamber, and the first chamber and the second chamber form a 90-degree angle. A driving device is arranged in the third chamber, a first execution device, a first flexible magnetic field shielding cover and a first magnet are arranged in the first chamber, and a second execution device, a second flexible magnetic field shielding cover and a second magnet are arranged in the second chamber. The driving device can simultaneously drive the first execution device and the second execution device to stretch or compress the first flexible magnetic field shielding cover and the second flexible magnetic field shielding cover respectively. When the magnetic field shielding cover is in a fully stretched state, the magnetic field shielding cover surrounds the corresponding magnet inside it. When the magnetic field shielding cover is in a fully compressed state, the corresponding magnet is completely exposed outside the magnetic field shielding cover. The driving device includes a worm gear, a worm, a first transmission shaft and a second transmission shaft. The axis of the worm is perpendicular to the base. Both the first transmission shaft and the second transmission shaft are parallel to the plane of the base, and the first transmission shaft is perpendicular to the second transmission shaft. On the first transmission shaft, a worm gear is fixedly connected. The worm gear is in mating connection with the worm. At both ends of the first transmission shaft, a first bevel gear and a second bevel gear are respectively fixedly arranged. At both ends of the second transmission shaft, a third bevel gear and a fourth bevel gear are respectively fixedly arranged. The first transmission shaft and the second transmission shaft are in mating connection through the second bevel gear and the third bevel gear. At the top of the worm, an L-shaped handle is further arranged. The handle is hinged to the worm through a pin shaft. On the upper covers of the first chamber, the second chamber and the third chamber, upper covers are arranged. On the upper cover of the third chamber, a handle hole is further arranged. ​ 2. The device fixing base according to claim 1, wherein: The first actuating device includes a first push plate, and a first lead screw, a second lead screw, a first guide rod, and a second guide rod that are arranged in parallel; one ends of the first lead screw and the second lead screw both extend into the third chamber, and a fifth bevel gear and a sixth bevel gear are respectively fixedly arranged at their end portions. A plurality of nut sliders are sleeved on both the first lead screw and the second lead screw, and a plurality of slip rings are sleeved on both the first guide rod and the second guide rod. The nut sliders and the slip rings are both connected to the first flexible magnetic field shielding cover; the first lead screw, the second lead screw, the first guide rod, and the second guide rod all vertically pass through the first push plate, and the first push plate is fixedly connected to the nut slider closest to the third chamber on the first lead screw and the second lead screw, and the first push plate is fixedly connected to the slip ring closest to the third chamber on the first guide rod and the second guide rod; the first flexible magnetic field shielding cover is in the shape of a pocket with a square cross-section under the constraint of the first lead screw, the second lead screw, the first guide rod, and the second guide rod. The fixed end of the first flexible magnetic field shielding cover is fixedly connected to the side wall of the first chamber, and the movable end of the first flexible magnetic field shielding cover is connected to the first push plate; the first magnet is arranged at the center of the first flexible magnetic field shielding cover, and both ends of the first magnet are fixedly connected to the side wall of the first chamber and the side wall of the third chamber through the top columns respectively. A first through hole is arranged at the center of the first push plate, and the first through hole allows the top columns and the first magnet to pass through freely.

3. The device fixing base that is convenient for disassembly and assembly according to claim 2, wherein: The first bevel gear is in mating connection with the fifth bevel gear, and the second bevel gear is in mating connection with the sixth bevel gear.

4. The device fixing base that is convenient for disassembly and assembly according to claim 1, wherein: The second actuating device includes a second push plate, and a third lead screw, a fourth lead screw, a third guide rod, and a fourth guide rod that are arranged in parallel; one ends of the third lead screw and the fourth lead screw both extend into the third chamber, and a seventh bevel gear is fixedly arranged at the end portion of the fourth lead screw; a plurality of nut sliders are sleeved on both the third lead screw and the fourth lead screw, and the nut sliders are all connected to the second flexible magnetic field shielding cover; a plurality of slip rings are sleeved on both the third guide rod and the fourth guide rod, and the slip rings are all connected to the second flexible magnetic field shielding cover; the third lead screw, the fourth lead screw, the third guide rod, and the fourth guide rod all vertically pass through the second push plate, and the second push plate is fixedly connected to the nut slider closest to the third chamber on the third lead screw and the fourth lead screw, and the second push plate is fixedly connected to the slip ring closest to the third chamber on the third guide rod and the fourth guide rod; the second flexible magnetic field shielding cover is in the shape of a pocket with a square cross-section under the constraint of the third lead screw, the fourth lead screw, the third guide rod, and the fourth guide rod. The fixed end of the second flexible magnetic field shielding cover is fixedly connected to the side wall of the second chamber, and the movable end of the second flexible magnetic field shielding cover is connected to the second push plate; the second magnet is arranged at the center of the second flexible magnetic field shielding cover, and both ends of the second magnet are fixedly connected to the side wall of the second chamber and the side wall of the third chamber through the top columns respectively. A second through hole is arranged at the center of the second push plate, and the second through hole allows the top columns and the second magnet to pass through freely.

5. The device fixing base that is convenient for disassembly and assembly according to claim 4, characterized in that: The end of the third lead screw extending into the third chamber is coaxially and fixedly connected to the first transmission shaft through a second bevel gear, and the fourth bevel gear is in mating connection with the seventh bevel gear.

6. The device fixing base that is convenient for disassembly and assembly according to claim 1, wherein: The first magnet and the second magnet are bar-shaped permanent magnets, and the upper and lower surfaces of the bar-shaped permanent magnet are respectively the two poles of the magnet.

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