An automatic tracking and positioning jet fire extinguishing device

Abstract

This invention relates to the field of fire-fighting equipment, and in particular to an automatic tracking and positioning jet fire extinguishing device, comprising an automatic fire extinguishing device and a water pipe. The water pipe is vertically positioned at the top of the automatic fire extinguishing device, and a slip ring mechanism is provided between the top of the automatic fire extinguishing device housing and the water pipe. The slip ring mechanism includes a disc and a flange that fits onto the disc. A first silicone ring and a second silicone ring are fitted between the peripheral wall of the disc and the inner wall of the flange. A first electrode strip and a second electrode strip are fitted between the first and second silicone rings. This slip ring mechanism of the automatic tracking and positioning jet fire extinguishing device uses cylindrical electrode columns instead of traditional electrode contacts in the form of rollers. By controlling the gap during assembly and elastically compressing the rollers, reliable contact pressure is achieved, and sufficient conductive area is obtained. This transforms the sliding friction of traditional electrical slip rings into rolling friction, reducing working wear and extending service life.

Description

Technical Field

[0001] This invention relates to the field of fire-fighting equipment, and in particular to an automatic tracking and positioning jet fire extinguishing device. Background Technology

[0002] Automatic tracking and positioning jet fire extinguishers can receive and identify the infrared radiation of flames. Driven by a servo system, they aim the water cannon nozzle at the flames and spray to extinguish the fire. Automatic tracking and positioning jet fire extinguishers have been widely used in indoor spaces with high ceilings, such as shopping malls and warehouses. However, there is a significant problem with this type of automatic tracking and positioning jet fire extinguisher. Although the water cannon of the automatic tracking and positioning jet fire extinguisher can achieve 360-degree continuous rotation of the spray direction through a liquid slip ring, because the automatic tracking and positioning jet fire extinguisher needs to be connected to a DN50 fire water pipe, the cables of its internal electrical components such as solenoid valves, drive motors, and drive circuits cannot rotate continuously with the water cannon. Otherwise, they will become entangled with the fire water pipe. Therefore, when the water cannon rotates to its limit angle, it needs to rotate in the opposite direction to achieve full coverage of the fire extinguishing range around the automatic tracking and positioning jet fire extinguisher. Therefore, in order to solve the above problems, an automatic tracking and positioning jet fire extinguishing device is proposed. Summary of the Invention

[0003] In view of the problem that the cable of the automatic tracking and positioning jet fire extinguisher in the above or existing technology can get tangled with the fire water pipe, thus limiting the rotation angle of the water cannon when it is working, the present invention is proposed.

[0004] Therefore, the purpose of this invention is to provide an automatic tracking and positioning jet fire extinguishing device.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an automatic tracking and positioning jet fire extinguishing device, comprising an automatic fire extinguishing device and a water pipe, wherein the water pipe is vertically arranged at the top of the automatic fire extinguishing device, and a slip ring mechanism is further provided between the top of the automatic fire extinguishing device housing and the water pipe; the slip ring mechanism comprises a disc and a flange fitted onto the disc, wherein a first silicone ring and a second silicone ring are fitted between the peripheral wall of the disc and the inner wall of the flange, wherein a first electrode strip and a second electrode strip are fitted between the first silicone ring and the second silicone ring, and an electrode post and an insulating needle are clamped between the first electrode strip and the second electrode strip, wherein the electrode post and the needle are arranged in a ring array about the disc, and an insulating slider is slidably connected between the electrode post and the insulating needle; the second electrode strip is fitted inside the first electrode strip, and a wire is led out from the second electrode strip to the outside of the automatic fire extinguishing device housing, and a wire is introduced into the first electrode strip to the inside of the automatic fire extinguishing device housing; the flange is fixedly fitted to the automatic fire extinguishing device housing, and the disc is coaxially fixedly fitted to the outer wall of the water pipe.

[0006] In a preferred embodiment of the automatic tracking and positioning jet fire extinguishing device of the present invention, the outer wall of the first silicone ring is fixedly attached to the inner wall of the flange, and the inner wall of the second silicone ring is fixedly attached to the circumferential wall of the disc; the outer wall of the first electrode strip is fixedly attached to the inner wall of the first silicone ring, and the inner wall of the second electrode strip is fixedly attached to the outer wall of the second silicone ring.

[0007] As a preferred embodiment of the automatic tracking and positioning jet fire extinguishing device of the present invention, wherein: the electrode post presses against the first electrode strip and the second electrode strip, and the first electrode strip and the second electrode strip are in arc-shaped contact with the electrode post, and the diameter of the insulating roller is equal to the average gap width between the first electrode strip and the second electrode strip.

[0008] As a preferred embodiment of the automatic tracking and positioning jet fire extinguishing device of the present invention, the insulating slider is in the shape of a curved arc, and the arc surface of the insulating slider is coaxial with the disk. The thickness of the insulating slider is less than the diameter of the insulating needle, and the electrode post, the insulating needle, and the disk are axially parallel.

[0009] As a preferred embodiment of the automatic tracking and positioning jet fire extinguishing device of the present invention, wherein: the peripheral wall of the insulating roller is provided with a side strip, and the side strip is clamped and slidable between an adjacent first electrode strip and an adjacent second electrode strip.

[0010] As a preferred embodiment of the automatic tracking and positioning jet fire extinguishing device of the present invention, the first electrode strip, the second electrode strip and the electrode post are all distributed at equal intervals along the axial direction of the disk, and the first silicone ring fills the gap between adjacent first electrode strips, and the second silicone ring fills the gap between adjacent second electrode strips.

[0011] As a preferred embodiment of the automatic tracking and positioning jet fire extinguishing device of the present invention, an insulating pad is provided between adjacent electrode posts, the arc edge of the insulating pad is clamped and slidably between adjacent first electrode strips and adjacent second electrode strips, and both ends of the insulating pad are fixedly sleeved with the electrode posts.

[0012] As a preferred embodiment of the automatic tracking and positioning jet fire extinguishing device of the present invention, the bottom surface of the disc is hollow, and the top of the disc is provided with a clamp in a C-shape along its axial direction. The clamp is connected to a water pipe, and the two ends of the clamp are locked with screws. A slit is provided between the two ends of the clamp and the disc.

[0013] As a preferred embodiment of the automatic tracking and positioning jet fire extinguishing device of the present invention, wherein: a ring fixing seat is coaxially provided at the top of the disc, and a thin-walled bearing is sleeved on the outer wall of the ring fixing seat, and the inner ring of the thin-walled bearing is provided in a ring array with screws pressing the inner ring of the thin-walled bearing at the top of the ring fixing seat.

[0014] As a preferred embodiment of the automatic tracking and positioning jet fire extinguishing device of the present invention, wherein: a collar is fixedly connected to the top of the flange, and the collar covers a first silicone ring, a second silicone ring, a first electrode strip, a second electrode strip and an electrode post, and the collar is interference-fitted with the outer ring of the thin-walled bearing.

[0015] The beneficial effects of the automatic tracking and positioning jet fire extinguishing device of the present invention are as follows: The slip ring mechanism of the automatic tracking and positioning jet fire extinguishing device adopts a cylindrical electrode column in the form of a roller instead of a traditional electrode contact piece. By assembling and controlling the gap and elastically squeezing the roller, reliable contact pressure is achieved and sufficient conductive area is obtained. The sliding friction of the traditional electrical slip ring is changed into rolling friction, which reduces working loss and extends service life. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of an automatic tracking and positioning jet fire extinguishing device.

[0018] Figure 2 A schematic diagram of the slip ring mechanism for an automatic tracking and positioning jet fire extinguishing device.

[0019] Figure 3 For automatic tracking and positioning jet fire extinguishing devices Figure 2 A structural diagram from the bottom view.

[0020] Figure 4 For automatic tracking and positioning jet fire extinguishing devices Figure 2 Enlarged view of the structure of A in the middle.

[0021] Figure 5 A partial cross-sectional schematic diagram of an automatic tracking and positioning jet fire extinguishing device.

[0022] Figure 6 For automatic tracking and positioning jet fire extinguishing devices Figure 5 The structure explodes.

[0023] Figure 7 For automatic tracking and positioning jet fire extinguishing devices Figure 6 Local structural decomposition diagram.

[0024] Figure 8 This is a schematic diagram of the structure of Embodiment 3 of the automatic tracking and positioning jet fire extinguishing device.

[0025] In the diagram: 100, Automatic fire extinguishing equipment; 101, Water pipe; 200, Slip ring mechanism; 201, Disc; 202, Flange; 203, First silicone ring; 204, Second silicone ring; 205, First electrode strip; 206, Second electrode strip; 207, Electrode post; 208, Insulating needle roller; 209, Insulating slider; 210, Collar; 201a, Clamp; 201b, Slit; 201c, Ring fixing seat; 207a, Insulating pad; 208a, Edge strip; 300, Thin-walled bearing. Detailed Implementation

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] Example 1, referring to Figures 1 to 7 This is the first embodiment of the present invention, which provides an automatic tracking and positioning jet fire extinguishing device that can prevent external cables from tangling with pipes when the automatic fire extinguishing device 100 rotates continuously in any direction. It includes an automatic fire extinguishing device 100 and a water pipe 101. The water pipe 101 is vertically positioned at the top of the automatic fire extinguishing device 100. A slip ring mechanism 200 is also provided between the top of the automatic fire extinguishing device 100 housing and the water pipe 101. The slip ring mechanism 200 includes a disc 201 and a flange 202 fitted onto the disc 201. A first silicone ring 203 and a second silicone ring 204 are fitted between the peripheral wall of the disc 201 and the inner wall of the flange 202. A first electrode strip 205 and a second electrode strip 206 are sleeved between the rings 204, and an electrode post 207 and an insulating needle roller 208 are sandwiched between the first electrode strip 205 and the second electrode strip 206. The electrode post 207 and the needle roller are arranged in a ring array about the disc 201, and an insulating slider 209 is slidably connected between the electrode post 207 and the insulating needle roller 208. The second electrode strip 206 is sleeved inside the first electrode strip 205, and the second electrode strip 206 leads a wire to the outside of the automatic fire extinguishing device 100 housing, while the first electrode strip 205 leads a wire to the inside of the automatic fire extinguishing device 100 housing. The flange 202 is fixedly sleeved with the automatic fire extinguishing device 100 housing, and the disc 201 is coaxially fixedly sleeved with the outer wall of the water pipe 101.

[0028] Specifically, the outer wall of the first silicone ring 203 is fixedly fitted to the inner wall of the flange 202, and the inner wall of the second silicone ring 204 is fixedly fitted to the peripheral wall of the disc 201. The outer wall of the first electrode strip 205 is fixedly fitted to the inner wall of the first silicone ring 203, and the inner wall of the second electrode strip 206 is fixedly fitted to the outer wall of the second silicone ring 204. The electrode post 207 presses against the first electrode strip 205 and the second electrode strip 206, and the first electrode strip 205 and the second electrode strip 206 are in arc-shaped contact with the electrode post 207. The diameter of the insulating needle roller 208 is the same as that of the first electrode strip 203. The average gap width between the electrode strip 205 and the second electrode strip 206 is equal. The insulating slider 209 is curved in an arc shape, and the arc surface of the insulating slider 209 is coaxial with the disk 201. The thickness of the insulating slider 209 is less than the diameter of the insulating needle roller 208. The bottom surface of the disk 201 is hollow, and the top of the disk 201 is C-shaped with a clamp 201a along its axial direction. The clamp 201a is sleeved with the water pipe 101, and the two ends of the clamp 201a are locked with screws. A slit 201b is provided between the two ends of the clamp 201a and the disk 201.

[0029] The working principle and advantages of this device are further explained in conjunction with existing technology: Currently available automatic tracking and positioning jet fire extinguishing devices, taking conventional hoisting as an example, rely on a 360-degree rotating joint between the automatic fire extinguishing device 100 and the internal pipe for rotation. When the water cannon rotates, the cable at the top of the automatic fire extinguishing device 100 will wrap around the water pipe 101. Obviously, when the rotation angle of the automatic fire extinguishing device 100 is large, the cable will become entangled with the pipe. Currently used electrical slip rings need to be installed on the axis of the rotating object. However, the bottom of the automatic fire extinguishing device 100 is the water cannon, and the top axis is the pipe used to connect the fire water pipe 101. Therefore, the installation conditions of conventional electrical slip rings cannot be met. For this reason, the present invention proposes an automatic tracking and positioning jet fire extinguishing device with a slip ring mechanism 200.

[0030] The present invention mainly provides a slip ring mechanism 200, which differs from conventional slip rings or sliding conductive structures in that it does not use sliding friction contact methods such as contact pieces or spring pieces, but instead uses rolling friction contact method with lower friction and longer service life. When the first electrode strip 205 rotates relative to the second electrode strip 206, the electrode post 207 responsible for electrical connection between the first electrode strip 205 and the second electrode strip 206 rolls accordingly.

[0031] Since the contact surface of a typical cylindrical roller is a line contact, the contact area provided by the surface contact of a relatively small contact piece is smaller. Therefore, the first electrode strip 205 and the second electrode strip 206 of this device are thin and narrow, and possess a certain degree of elasticity. The first electrode strip 205 and the second electrode strip 206 are then positioned on the other side of the contact electrode post 207, where they are flexibly supported by a first silicone ring 203 and a recessed silicone ring. A rigid flange 202 and a disc 201 are then fitted onto the side of the first silicone ring 203 and the second silicone ring 204 furthest from the electrode strips to provide rigid support. The average gap width between the inner wall of the flange 202 and the outer wall of the disc 201 is [not specified]. The thickness is set to be less than the sum of the thickness of the first silicone wall, the thickness of the first electrode strip 205, the thickness of the second electrode strip 206, the thickness of the second silicone ring 204, and the diameter of the electrode post 207. This allows the electrode post 207 to be sandwiched between the first electrode strip 205 and the second electrode strip 206. Through compression, the silicone indentation at the electrode post 207 and the elastic bending of the electrode strip make contact with the electrode post 207 in an arc shape. This provides both sufficient conductive contact area and stable contact pressure, enabling the structure to simply and effectively realize the electrical slip ring function without interfering with the original water pipe 101 of the automatic fire extinguishing equipment 100.

[0032] In this device, only the electrode post 207 is responsible for conductive connection. The other areas between the first electrode strip 205 and the second electrode strip 206 are supported by insulating needle rollers 208, and the distance between adjacent insulating needle rollers 208 or between insulating needle rollers 208 and electrode post 207 is controlled by insulating slider 209 to make the spacing between them uniform.

[0033] The flange 202 is fixed to the first silicone ring 203, the disc 201 is fixed to the second silicone ring 204, the first silicone ring 203 is fixed to the first electrode strip 205, and the second silicone ring 204 is fixed to the second electrode strip 206 by adhesive bonding.

[0034] In summary, the slip ring mechanism of this automatic tracking and positioning jet fire extinguishing device uses cylindrical electrode posts 207 to replace traditional electrode contacts in the form of rollers. By controlling the gap during assembly and elastically squeezing the rollers, reliable contact pressure is achieved and sufficient conductive area is obtained. This transforms the sliding friction of traditional electrical slip rings into rolling friction, reducing working losses and extending service life.

[0035] Example 2, refer to Figure 3 , Figures 5-7This is the second embodiment of the present invention. Unlike the previous embodiment, which explained the basic structure and principle of how the electrical slip ring function is achieved between the first electrode strip 205 and the second electrode strip 206 in Embodiment 1, this embodiment provides a combined structure for an automatic tracking and positioning jet fire extinguishing device. Since the cable contains multiple conductors, including power lines and signal lines, the basic structure in Embodiment 1 is layered to meet the conductivity requirements of multiple lines. Specifically, the first electrode strip 205, the second electrode strip 206, and the electrode posts 207 are all evenly spaced along the axial direction of the disk 201, and the first silicone ring 203 fills... The gap between adjacent first electrode strips 205 is filled by a second silicone ring 204, and the gap between adjacent second electrode strips 206 is filled by a second silicone ring 204. The electrode posts 207, insulating needle rollers 208 and disk 201 are axially parallel. The peripheral wall of the insulating needle roller 208 is provided with a side strip 208a, which is clamped and slid between adjacent first electrode strips 205 and adjacent second electrode strips 206. An insulating pad 207a is provided between adjacent electrode posts 207. The arc edge of the insulating pad 207a is clamped and slid between adjacent first electrode strips 205 and adjacent second electrode strips 206, and the two ends of the insulating pad are fixedly sleeved with the electrode posts 207.

[0036] refer to Figure 5 and Figure 6 The device comprises multiple layers of first electrode strips 205 and second electrode strips 206, with electrode posts 207 positioned between each electrode strip. By optimizing the shape of the first silicone ring 203 and the second silicone ring 204, the device partially fills and blocks the spaces between adjacent first electrode strips 205 and adjacent second electrode strips 206, achieving insulation between different circuits. The electrode posts 207 are insulated together by insulating pads 207a. The edge strips 208a (both made of rigid material) on the outer walls of the insulating pads 207a and the insulating rollers 208 are also pressed into the spaces between adjacent first electrode strips 205 and adjacent second electrode strips 206. This not only prevents the electrode posts 207 and the insulating rollers 208 from detaching from the structure, but also further increases the reliability of insulation between the electrode strips.

[0037] The insulating pad 207a is extruded and connected to the inner cavity of the electrode post 207 as a single unit. The extruded connection between the insulating pad 207a and the electrode post 207 is not limited to... Figure 7 The shape shown can be replaced with other shapes depending on the required strength.

[0038] The rest of the structure is the same as in Example 1.

[0039] In summary, this device can meet the requirements for the use of electrical slip rings in multi-core cables.

[0040] Example 3, referring to Figure 8This is the third embodiment of the present invention. Unlike the previous embodiment, this embodiment provides an auxiliary structure for the automatic tracking and positioning jet fire extinguishing device. Because silicone material is sandwiched between the flange 202 and the disc 201, misalignment may occur, causing significant fluctuations in the pressure exerted between the electrode post 207 and the first electrode strip 205 and the second electrode strip 206 when the electrode post 207 moves to different positions. Therefore, by adding a thin-walled bearing 300, the gap width between the flange 202 and the disc 201 is kept uniform. The disc 201 includes a ring fixing seat 201c coaxially disposed at the top end of the disc 201, and a thin-walled bearing 300 sleeved on the outer wall of the ring fixing seat 201c. The inner ring of the thin-walled bearing 300 is screwed in a ring array at the top end of the ring fixing seat 201c. A collar 210 is fixedly connected to the top end of the flange 202, and the collar 210 covers the first silicone ring 203, the second silicone ring 204, the first electrode strip 205, the second electrode strip 206 and the electrode post 207. The collar 210 is interference-fitted with the outer ring of the thin-walled bearing 300.

[0041] Because the first silicone ring 203 and the second silicone ring 204 are sandwiched between the flange 202 and the disc 201, it is difficult to keep the gap width (or the squeezing force on the electrode post 207) consistent at various points between the flange 202 and the disc 201. Therefore, based on the rolling support of multiple insulating needle rollers 208 evenly distributed between the first electrode strip 205 and the second electrode strip 206, a thin-walled bearing 300 is added. The inner and outer rings of the thin-walled bearing 300 are respectively assembled between the flange 202 and the disc 201 through an annular fixed seat and a collar 210. The relative position between the flange 202 and the disc 201 is controlled by the relatively precise rotation structure of the inner and outer rings of the thin-walled bearing 300.

[0042] The rest of the structure is the same as in Example 2.

[0043] In summary, the redundant design of the insulating needle roller 208 and the thin-walled bearing 300 ensures the structural stability between the flange 202 and the disc 201, so that the extrusion force on the electrode post 207 is balanced when it rolls between the first electrode strip 205 and the second electrode strip 206.

[0044] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An automatic tracking and positioning jet fire extinguishing device, comprising an automatic fire extinguishing device (100) and a water pipe (101), characterized in that: The water pipe (101) is vertically installed at the top of the automatic fire extinguishing device (100), and a slip ring mechanism (200) is also provided between the top of the automatic fire extinguishing device (100) housing and the water pipe (101). The slip ring mechanism (200) includes a disc (201) and a flange (202) fitted onto the disc (201). A first silicone ring (203) and a second silicone ring (204) are fitted between the peripheral wall of the disc (201) and the inner wall of the flange (202). A first electrode strip (205) and a second electrode strip (206) are fitted between the first silicone ring (203) and the second silicone ring (204). An electrode post (206) is sandwiched between the first electrode strip (205) and the second electrode strip (206). 07) and insulating needle roller (208), the electrode post (207) and the needle roller are arranged in a ring array about the disk (201), and an insulating slider (209) is slidably connected between the electrode post (207) and the insulating needle roller (208), the second electrode strip (206) is sleeved inside the first electrode strip (205), and the second electrode strip (206) leads a wire to the outside of the automatic fire extinguishing device (100) housing, and the first electrode strip (205) leads a wire to the inside of the automatic fire extinguishing device (100) housing; The flange (202) is fixedly sleeved with the housing of the automatic fire extinguishing equipment (100), and the disc (201) is coaxially fixedly sleeved with the outer wall of the water pipe (101); The insulating needle roller (208) has a side strip (208a) on its peripheral wall, and the side strip (208a) slides between the adjacent first electrode strip (205) and the adjacent second electrode strip (206). An insulating pad (207a) is provided between adjacent electrode posts (207). The arc edge of the insulating pad (207a) slides between the adjacent first electrode strip (205) and the adjacent second electrode strip (206), and both ends of the insulating pad are fixedly sleeved with the electrode post (207).

2. The automatic tracking and positioning jet fire extinguishing device as described in claim 1, characterized in that: The outer wall of the first silicone ring (203) is fixedly attached to the inner wall of the flange (202), and the inner wall of the second silicone ring (204) is fixedly attached to the peripheral wall of the disk (201). The outer wall of the first electrode strip (205) is fixedly attached to the inner wall of the first silicone ring (203), and the inner wall of the second electrode strip (206) is fixedly attached to the outer wall of the second silicone ring (204).

3. The automatic tracking and positioning jet fire extinguishing device as described in claim 2, characterized in that: The electrode post (207) presses the first electrode strip (205) and the second electrode strip (206), and the first electrode strip (205) and the second electrode strip (206) are in arc-shaped contact with the electrode post (207). The diameter of the insulating needle roller (208) is equal to the average gap width between the first electrode strip (205) and the second electrode strip (206).

4. The automatic tracking and positioning jet fire extinguishing device as described in claim 3, characterized in that: The insulating slider (209) is curved in an arc shape, and the arc surface of the insulating slider (209) is coaxial with the disk (201). The thickness of the insulating slider (209) is less than the diameter of the insulating needle (208). The electrode post (207), the insulating needle (208) and the disk (201) are axially parallel.

5. The automatic tracking and positioning jet fire extinguishing device as described in claim 4, characterized in that: The first electrode strip (205), the second electrode strip (206) and the electrode post (207) are all distributed at equal intervals along the axial direction of the disk (201), and the first silicone ring (203) fills the gap between adjacent first electrode strips (205), and the second silicone ring (204) fills the gap between adjacent second electrode strips (206).

6. The automatic tracking and positioning jet fire extinguishing device as described in claim 5, characterized in that: The bottom surface of the disc (201) is hollow, and the top of the disc (201) is provided with a clamp (201a) in a C-shape along its axial direction. The clamp (201a) is fitted with a water pipe (101), and the two ends of the clamp (201a) are locked with screws. A slit (201b) is provided between the two ends of the clamp (201a) and the disc (201).

7. The automatic tracking and positioning jet fire extinguishing device as described in claim 6, characterized in that: The top of the disk (201) is coaxially provided with a ring fixing seat (201c), and a thin-walled bearing (300) is sleeved on the outer wall of the ring fixing seat (201c). The top of the ring fixing seat (201c) is provided with screws pressing the inner ring of the thin-walled bearing (300) in a ring array.

8. The automatic tracking and positioning jet fire extinguishing device as described in claim 7, characterized in that: The flange (202) is fixedly connected to the top end of a collar (210), and the collar (210) covers the first silicone ring (203), the second silicone ring (204), the first electrode strip (205), the second electrode strip (206) and the electrode post (207). The collar (210) is interference-fitted with the outer ring of the thin-walled bearing (300).

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