Maintenance-free sealed contact system

Abstract

The present application discloses a maintenance-free sealed contact system, which relates to the technical field of contact equipment, including an external box, a bearing box, a static contact, a rotating bearing body and a moving contact assembly; a cable output slot and an air injection one-way valve are provided on one side of the external box; the sealing bag is a strip-shaped elastic soft bag, which seals the bearing tube and then the external box as a whole after being inflated; there are multiple static contacts; the rotating bearing body is a columnar shaft body, which is inserted into and rotatably connected to the bearing box body, and is provided with a positioning groove; the moving contact assembly includes a cylindrical conductive wheel, a bearing frame and a force supply spring; the cylindrical conductive wheel is rotatably connected to the bearing frame; the bearing frame is slidably positioned in the positioning groove; the force supply spring squeezes the bearing frame; the dynamic and static contacts of the automatic switch contact system are well protected, maintenance-free, low in failure rate, good in use stability and strong in applicability.

Description

Technical Field

[0001] The invention relates to the technical field of contact equipment, and in particular to a maintenance-free sealed contact system. Background Art

[0002] The automatic switch contact system is mainly suitable for electric turnout machines and turnout closeness inspection equipment in the rail transit field. It is the main component of the electric turnout machine to complete automatic turnout conversion and position inspection, realize the automation and intelligence of the rail transit system, and is also an important component to improve the transportation efficiency of the rail transit system and ensure the safety of rail transit operations.

[0003] In the prior art, the contact system of the automatic switch is generally limited by its own structure, and there are technical problems such as the need for maintenance personnel to perform regular on-site maintenance (regular inspection, tightening, oiling, etc.), the large maintenance workload, and the difficulty in ensuring the maintenance quality. There is also the problem that the contact group is easily corroded by water, dust and oxides in the air and mechanical lubricants, which leads to the problem that the contact surface is prone to adsorption of dirt, oxidation and rust, and thus causes equipment failure; in addition, there are technical problems such as contacts are easily burned or contaminated, the contact stability of the dynamic and static contact surfaces is poor, the applicability is poor, the contacts are easily worn, and the external wiring terminals are easy to loosen.

[0004] Therefore, there is a need for a maintenance-free sealed contact system in which both the moving and static contacts are well protected, require no maintenance, have a low failure rate, have good stability in use and are highly applicable. Summary of the invention

[0005] The embodiments of the present application provide a maintenance-free sealed contact system, thereby solving the technical problems in the prior art that the automatic switch contact system requires regular on-site maintenance by maintenance personnel, the maintenance workload is large, the maintenance quality is difficult to ensure, the contact group is easily corroded, the contacts are easily burned and contaminated, the contact stability of the dynamic and static contacts is poor, the applicability is poor, and the contacts are easily worn. The embodiment of the present application realizes a maintenance-free sealed contact system in which the dynamic and static contacts of the automatic switch contact system are well protected, do not require maintenance, have a low failure rate, have good stability in use, and have strong applicability.

[0006] The embodiment of the present application provides a maintenance-free sealed contact system, including an external box, a bearing box, a static contact, a rotating bearing body and a moving contact assembly;

[0007] A cable output slot is provided on one side of the external box, and an air injection one-way valve is also provided; a bearing tube runs through the cable output slot, and an air transmission channel is provided on the bearing tube for connecting the internal space of the external box with the internal space of the closed bag; the closed bag is a strip-shaped elastic soft bag, and there are two of them, which are respectively fixed on the inner wall of the bearing tube, and after being inflated, the bearing tube is closed and the external box is closed as a whole;

[0008] The interior of the carrying box body is filled with an insulating medium;

[0009] There are multiple static contacts, which are fixed on the carrying box body and arranged in multiple rows;

[0010] The rotating bearing body is a columnar shaft body, which penetrates into and is rotatably connected to the bearing box body and is provided with a plurality of positioning grooves;

[0011] The movable contact assembly is multiple in number, including a cylindrical conductive wheel, a bearing frame and a force supplying compression spring;

[0012] The cylindrical conductive wheel rotates around its own axis and is connected to the supporting frame body;

[0013] The support frame body is slidably positioned in the positioning groove along the depth direction of the positioning groove;

[0014] The force supplying compression spring compresses the support frame through its own elastic force so that the cylindrical conductive wheel is closely attached to the inner wall of the support box body or the static contact point.

[0015] Furthermore, a built-in sponge is provided inside the closed capsule; the built-in sponge is a long strip of sponge, and the two closed capsules with the built-in sponges are normally tightly attached to each other.

[0016] Furthermore, the closed bag is surrounded by a closed sheet body fixed on the inner wall of the supporting tube and the inner wall of the supporting tube; the closed sheet body is a rectangular elastic rubber sheet body, and the edge of the closed sheet body is fixed on the inner wall of the supporting tube.

[0017] Preferably, the static contacts on the carrier box body are arranged in two rows, and the two rows of static contacts are arranged one above the other and parallel to each other.

[0018] Furthermore, the movable contact assembly also includes a floating tube and a fixed rod body;

[0019] The floating tube is a hard tube body, fixed on the support frame and with the axial direction being in the same length direction as the moving contact assembly;

[0020] An annular positioning flange is positioned on the side wall of the floating tube near the supporting frame;

[0021] The fixing rod body is fixed on the inner bottom of the positioning groove, and includes a penetration rod and a fixing plate;

[0022] The fixing plate is a hard plate body, fixed on the inner bottom of the positioning groove; the penetration rod is fixed on the fixing plate and inserted into the floating tube;

[0023] One end of the force supply compression spring is tightly attached to the fixing plate, and the other end is tightly attached to the positioning flange.

[0024] Preferably, the closed sheet is formed by splicing two long rectangular sheets, namely a first sheet and a second sheet; the long sides of the first sheet and the second sheet are spliced ​​together, the first sheet is a plastic soft film, and the second sheet is an elastic rubber sheet; when the external box is closed, the first sheet is exposed to the outside.

[0025] Preferably, a storage box is fixed on the top of the carrying box body, and a color-changing desiccant is placed in the storage box. The color-changing desiccant is used to absorb moisture in the external box body; the external box body is made of transparent material.

[0026] Preferably, when using an air pump to inflate the interior of the external box, an inert gas is introduced; when inflating, first insert the hard tube body into the supporting tube, cooperate with the air pump to discharge most of the original gas in the external box body, and then pull out the hard tube body.

[0027] Preferably, a positioning through hole is provided on the static contact, and the wire connected to the static contact is fixed by bolts and nuts;

[0028] A plurality of bearing positioning pieces are positioned on the outer wall of the bearing box body. The bearing positioning pieces are hard plates, arranged longitudinally, and located between the static contacts, and are used to bear and fix the elastic strip capsules;

[0029] The load-bearing positioning plate is provided with a plurality of through holes, each of which is of the same size and arranged in multiple rows, with the axes of the through holes in the same row coinciding and located above and / or below the static contact;

[0030] The elastic strip bag is a long elastic rubber bag with an opening at one end, the number of which is the same as the number of rows of through holes. After installing and fixing the supporting box body, an elastic strip bag is inserted into each row of through holes. The through holes in the same row are penetrated by using the elastic strip bag, and then an air pump is used to pump gas into the elastic strip bag to make it expand and contact the bolts and / or nuts used to fix the wires on the static contact, and finally the elastic strip bag is closed.

[0031] Preferably, when an air pump is used to inject gas into the elastic strip bag, the elastic strip bag expands and covers the connection position between the wire and the static contact; thereafter, when gas is injected into the external box, the elastic strip bag shrinks under the action of the air pressure and no longer covers the connection position between the wire and the static contact, but only contacts the bolt and / or nut on the static contact for fixing the wire;

[0032] Once the external box leaks, the air pressure inside the external box decreases, and the elastic strip bag will expand under the action of the air pressure to re-cover the connection position between the wire and the static contact. At this time, the elastic strip bag also plays a temporary role in dust and water proofing the connection position between the wire and the static contact.

[0033] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0034] By providing a maintenance-free sealed contact system, a box-shaped container filled with an insulating medium is used to store a positioning rod-shaped moving contact, and the connection and disconnection of the moving and static contacts are realized by driving a roller to move; the box-shaped container is stored inside the box-shaped container to isolate the static contacts located outside the box-shaped container from oxygen, water, particulate matter, etc. in the air outside the box-shaped container; the technical problems in the prior art that the automatic switch contact system requires regular on-site maintenance by maintenance personnel, the maintenance workload is large, the maintenance quality is difficult to ensure, the contact group is easily corroded, the contacts are easily burned and contaminated, the contact stability of the moving and static contacts is poor, the applicability is poor, and the contacts are easy to wear are effectively solved, thereby realizing a maintenance-free sealed contact system in which the moving and static contacts of the automatic switch contact system can be well protected, no maintenance is required, the failure rate is low, the use stability is good, and the applicability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the maintenance-free sealed contact system of the present invention;

[0036] Figure 2 This is a schematic diagram of the appearance structure of the maintenance-free sealed contact system of the present invention;

[0037] Figure 3 It is a schematic diagram of the bottom structure of the carrier box of the maintenance-free sealed contact system of the present invention;

[0038] Figure 4 It is a schematic diagram of the appearance structure of the carrier box of the maintenance-free sealed contact system of the present invention;

[0039] Figure 5 A schematic diagram of the positional relationship between the support tube and the sealing capsule of the maintenance-free sealed contact system of the present invention;

[0040] Figure 6 A simplified structural diagram of a closed sheet body of the maintenance-free sealed contact system of the present invention;

[0041] Figure 7 It is a schematic diagram of the positional relationship between the first sheet body and the second sheet body of the maintenance-free sealed contact system of the present invention;

[0042] Figure 8 This is a schematic structural diagram of the built-in sponge of the maintenance-free sealed contact system of the present invention;

[0043] Fig. 9 It is a schematic diagram of the internal structure of the carrier box of the maintenance-free sealed contact system of the present invention;

[0044] Fig.10 It is a schematic diagram of the positional relationship between the moving contact assembly, the rotating bearing body and the static contact of the maintenance-free sealed contact system of the present invention;

[0045] Fig.11 A schematic diagram of the positional relationship between the moving contact assembly and the static contact of the maintenance-free sealed contact system of the present invention;

[0046] Fig.12 It is a schematic structural diagram of the movable contact assembly of the maintenance-free sealed contact system of the present invention.

[0047] In the figure:

[0048] An external box 100, a cable output slot 110, a supporting tube 120, an air transmission channel 121, a closed capsule 130, a closed sheet 131, a built-in sponge 132, a first sheet 133, a second sheet 134, a gas injection one-way valve 140, a supporting box body 200, a supporting positioning sheet 210, a through hole 220, a shock-absorbing pad 230, a storage box 240, a static contact 300, a rotating supporting body 400, a positioning slot 410, a moving contact assembly 500, a cylindrical conductive wheel 510, a supporting frame 520, a floating tube 530, a positioning flange 531, a fixed rod body 540, a penetration rod 541, a fixing plate 542, a force supply spring 550, and an elastic strip capsule 600. DETAILED DESCRIPTION

[0049] To facilitate the understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0050] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0052] See also Figure 1, which is a structural schematic diagram of the maintenance-free sealed contact system of the present invention; the present application provides a maintenance-free sealed contact system, which uses a box-shaped container filled with an insulating medium to store a positioning rod-shaped moving contact, and realizes the switching of the moving and static contacts by driving a roller to move; the box-shaped container is stored inside the box-shaped container to isolate the static contacts located outside the box-shaped container from contact with oxygen, water, particulate matter, etc. in the air outside the box-shaped container; it effectively solves the technical problems in the prior art that the automatic switch contact system requires maintenance personnel to perform regular on-site maintenance, the maintenance workload is large, the maintenance quality is difficult to ensure, the contact group is easily corroded, the contacts are easily burned and contaminated, the contact stability of the moving and static contacts is poor, the applicability is poor, and the contacts are easy to wear, thereby realizing a maintenance-free sealed contact system in which the moving and static contacts of the automatic switch contact system can be well protected, no maintenance is required, the failure rate is low, the use stability is good, and the applicability is strong. Example 1

[0053] like Figures 1 to 4 As shown, the maintenance-free sealed contact system of the present application includes an external box body 100 , a carrier box body 200 , a static contact 300 , a rotating carrier body 400 and a moving contact assembly 500 .

[0054] The external box 100 is a hard box that is waterproof and anti-fouling. A cable output slot 110 is provided on one side. The cable output slot 110 is a through slot arranged transversely for allowing cables to enter and exit the external box 100. A bearing tube 120 is fixed to the external box 100. The bearing tube 120 is a hard square tube with a length less than 5 cm. The outer wall is tightly attached to the inner wall of the cable output slot 110 and passes through the cable output slot 110, and is used to carry and position the closed capsule 130. The closed capsule 130 is a strip elastic Two soft bags are arranged transversely and fixed to the bottom and top of the inner wall of the supporting tube 120 respectively; the supporting tube 120 is provided with a gas transmission channel 121 connecting the internal space of the external box 100 with the internal space of the closed bag 130; after the two closed bags 130 are inflated, they close the supporting tube 120 and then the external box 100 as a whole; the external box 100 is also positioned with a gas injection check valve 140, which allows the gas in the external box 100 to only enter but not exit.

[0055] Furthermore, the external box 100 includes a container and an upper cover, which are detachably fixed together and a rubber pad for sealing is provided at the connection position.

[0056] Preferably, Figure 5 and Figure 8As shown, in order to ensure the sealing effect of the sealing bag 130 and prevent it from losing its sealing effect on the supporting tube 120 after leakage, a built-in sponge 132 is provided inside the sealing bag 130; the built-in sponge 132 is a long strip of sponge, and the two sealing bags 130 with built-in sponges 132 are tightly attached together under normal circumstances.

[0057] Preferably, the cross section of the built-in sponge 132 is semicircular, and a plurality of strip-shaped pits are provided on the top, and these pits are used to facilitate the passage of cables.

[0058] Furthermore, the sealing bag 130 is surrounded by a sealing sheet 131 fixed on the inner wall of the supporting tube 120 and the inner wall of the supporting tube 120 ; the sealing sheet 131 is a rectangular elastic rubber sheet, and its edge is fixed on the inner wall of the supporting tube 120 .

[0059] like Figures 9 and 10 As shown, the carrying box body 200 is a hard box body, which is hollow inside, and the internal space is a horizontal column. The material is preferably DuPont nylon, which is completely closed and filled with an insulating medium.

[0060] The static contacts 300 are metal blocks, there are multiple of them, fixed on the carrier box body 200 and arranged in multiple rows; the static contacts 300 penetrate the carrier box body 200, the static contacts 300 outside the carrier box body 200 are connected to the wires, and the surfaces of the static contacts 300 inside the carrier box body 200 are coplanar with the inner wall of the carrier box body 200.

[0061] Preferably, the static contacts 300 on the carrying box body 200 are arranged in two rows, and the two rows of static contacts 300 are disposed one above the other and parallel to each other.

[0062] Preferably, the static contacts 300 on the carrying box body 200 are arranged in four rows, with two rows on each side of the carrying box body 200 .

[0063] The rotating carrier 400 is a cylindrical shaft body, which is inserted into and rotatably connected to the carrier box body 200, and the axial direction of the rotating shaft is parallel to the horizontal ground; the rotating carrier 400 is driven by the basic fast-motion inspection device to rotate; the rotating carrier 400 is provided with a plurality of positioning grooves 410, which are cylindrical groove bodies, and the depth direction is perpendicular to the axial direction of the rotating carrier 400. The number is the same as the number of the moving contact assembly 500, and is used to carry and position the moving contact assembly 500.

[0064] The movable contact assembly 500 is multiple in number and is used to conduct the static contact 300, including a cylindrical conductive wheel 510, a carrier body 520 and a force supply compression spring 550; the cylindrical conductive wheel 510 is a cylindrical wheel body, which is partially or entirely made of a conductive material (at least the side is made of a conductive material), is used for conducting electricity, and always contacts the inner wall of the carrier box body 200 or the static contact 300; the carrier body 520 is used to support and position the cylindrical conductive wheel 510, and the cylindrical conductive wheel 510 is connected to the carrier body 520 by rotating around its own axis, and the axial direction of the cylindrical conductive wheel 510 is the same as the axial direction of the rotating carrier 400; the carrier body 520 is arranged along the positioning groove 410 is slidably positioned in the positioning groove 410 in the depth direction; the force supplying compression spring 550 is a compression spring, which is always in a compressed state. It squeezes the carrier body 520 through its own elastic force to exert pressure on the cylindrical conductive wheel 510, thereby making the cylindrical conductive wheel 510 close to the inner wall of the carrier box body 200 or the static contact 300; the rotation of the rotating carrier body 400 drives the moving contact assembly 500 to move as a whole. During the movement of the cylindrical conductive wheel 510, it will simultaneously abut against two adjacent static contacts 300 at a certain stage. At this time, the two adjacent static contacts 300 are turned on; the cylindrical conductive wheel 510 turns on different static contacts 300 to turn on different circuits.

[0065] Preferably, in order to ensure that the connection force between the static contact 300 and the moving contact assembly 500 is uniform and stable, both sides of the inner wall of the carrying box body 200 are arc surfaces.

[0066] Further, such as Fig.11 and Fig.12 As shown, the moving contact assembly 500 also includes a floating tube 530 and a fixed rod body 540; the floating tube 530 is a hard tube body, fixed on the supporting frame body 520 and the axial direction is the same as the length direction of the moving contact assembly 500; a ring-shaped positioning flange 531 is positioned on the side wall of the floating tube 530 near the supporting frame body 520; the fixed rod body 540 is fixed on the inner bottom of the positioning groove 410, including a penetration rod 541 and a fixed plate 542; the fixed plate 542 is a hard plate body, fixed on the inner bottom of the positioning groove 410; the penetration rod 541 is fixed on the fixed plate 542 and inserted into the floating tube 530; one end of the force supply spring 550 is tightly attached to the fixed plate 542, and the other end is tightly attached to the positioning flange 531.

[0067] When installing the maintenance-free sealed contact system of the embodiment of the present application: after fixing the external box 100, fix the components inside the external box 100, and pass the cables that need to pass through the external box 100 through the support tube 120 and ensure that the spacing between the cables passing through the support tube 120 is greater than 0.5 cm; after closing the external box 100, use an air pump (electric air pump or manual air pump) to inflate the inside of the external box 100, so that the sealing bag 130 expands to improve the sealing effect of the external box 100.

[0068] Preferably, after the maintenance-free sealed contact system of the present application is installed, the air pressure in the external box 100 is normally more than 1.4 times the atmospheric pressure of the surrounding environment.

[0069] Furthermore, the insulating medium is preferably insulating oil.

[0070] Preferably, after the maintenance-free sealed contact system of the present application is installed, oil is applied to the exposed sealing capsule 130 to improve the sealing effect and prevent aging.

[0071] Preferably, Figure 6 and Figure 7 As shown, in order to further reduce the risk of air leakage caused by aging of the closed bag 130, the closed sheet 131 is composed of two long rectangular sheets, namely a first sheet 133 and a second sheet 134; the long sides of the first sheet 133 and the second sheet 134 are spliced ​​together, the first sheet 133 is a plastic soft film, and the second sheet 134 is an elastic rubber sheet; when the external box 100 is closed, the first sheet 133 is exposed to the outside.

[0072] Preferably, a storage box 240 is fixed on the top of the carrier box body 200, and a color-changing desiccant is placed in the storage box 240, and the color-changing desiccant is used to absorb moisture in the external box body 100; the external box body 100 is made of transparent material; when inspecting the railway, the inspectors can easily determine the internal state of the external box body 100 by observing the color of the desiccant and the shape of the closed capsule 130.

[0073] Preferably, when using an air pump to inflate the external box 100, an inert gas is introduced; when inflating, first use a hard tube body to insert into the supporting tube 120, cooperate with the air pump to discharge most of the original gas in the external box 100, and then pull out the hard tube body.

[0074] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0075] The invention solves the technical problems in the prior art that the automatic switch contact system requires regular on-site maintenance by maintenance personnel, the maintenance workload is large, the maintenance quality is difficult to ensure, the contact group is easily corroded, the contacts are easily burned and contaminated, the contact stability of the dynamic and static contacts is poor, the applicability is poor, and the contacts are easily worn. The invention realizes a maintenance-free sealed contact system in which the dynamic and static contacts of the automatic switch contact system can be well protected, no maintenance is required, the failure rate is low, the use stability is good, and the applicability is strong. Example 2

[0076] Considering that when a high-speed train passes through a turnout, high-frequency vibration will be generated on the external box 100 and the components therein, resulting in loose connection (poor contact) between the static contact 300 and the wire, thereby affecting the stability of the entire system, and in severe cases, may even cause a flash failure of the contact group; in view of the above problems, the embodiment of the present application optimizes and improves the structure of the maintenance-free sealed contact system on the basis of the above embodiment, specifically:

[0077] The static contact 300 is provided with a positioning through hole, and the wire connected to the static contact 300 is fixed by bolts and nuts;

[0078] A shock absorbing pad 230 is provided at the bottom of the carrying box body 200, and the shock absorbing pad 230 is made of rubber;

[0079] A plurality of bearing positioning pieces 210 are positioned on the outer wall of the bearing box body 200. The bearing positioning pieces 210 are hard plates, arranged longitudinally, and located between the static contacts 300, and are used to bear and fix the elastic strip capsule 600.

[0080] The bearing positioning sheet 210 is provided with a plurality of through holes 220 , each of which is of the same size and arranged in multiple rows, and the axes of the through holes 220 in the same row coincide with each other and are located above and / or below the static contact 300 ;

[0081] The elastic strip bag 600 is an elongated elastic rubber bag with an opening at one end, the number of which is the same as the number of rows of through holes 220. After installing and fixing the supporting box body 200, an elastic strip bag 600 is inserted into each row of through holes 220. The through holes 220 in the same row are penetrated by the elastic strip bag 600, and then an air pump is used to pump gas into the elastic strip bag 600 to make it expand and contact the bolts and / or nuts used to fix the wires on the static contact 300, and finally the elastic strip bag 600 is closed. At this time, the elastic strip bag 600 plays a role in shock absorption and anti-loosening.

[0082] Preferably, when gas is injected into the elastic strip bag 600 with an air pump, the elastic strip bag 600 expands and covers the connection position between the wire and the static contact 300; thereafter, when gas is injected into the external box 100, the elastic strip bag 600 shrinks under the action of air pressure and no longer covers the connection position between the wire and the static contact 300, and only contacts the bolts and / or nuts on the static contact 300 for fixing the wire (at this time, the connection status between the static contact 300 and the wire can be easily observed); once the external box 100 leaks, the air pressure in the external box 100 decreases, and the elastic strip bag 600 expands under the action of air pressure to re-cover the connection position between the wire and the static contact 300. At this time, the elastic strip bag 600 also plays a role in temporarily preventing dust and water from the connection position between the wire and the static contact 300.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A maintenance-free sealed contact system, characterized in that: It comprises an external box body (100), a carrying box body (200), a static contact (300), a rotating carrying body (400) and a moving contact assembly (500); A cable output groove (110) and an air injection check valve (140) are provided on one side of the external box (100); a support tube (120) passes through the cable output groove (110) and is provided with an air transmission channel (121) for connecting the internal space of the external box (100) with the internal space of the closed bag (130); the closed bag (130) is a strip-shaped elastic soft bag, two in number, which are respectively fixed on the inner wall of the support tube (120) and, after being inflated, close the support tube (120) and thus close the external box (100) as a whole; The interior of the carrying box body (200) is filled with an insulating medium; The static contacts (300) are multiple in number and are fixed on the carrying box body (200) and arranged in multiple rows; The rotating bearing body (400) is a columnar shaft body, which penetrates into and is rotatably connected to the bearing box body (200), and is provided with a plurality of positioning grooves (410); The movable contact assembly (500) is multiple in number and includes a cylindrical conductive wheel (510), a bearing frame (520) and a force supply compression spring (550); The cylindrical conductive wheel (510) is rotatably connected to the supporting frame (520) around its own axis; The support frame (520) is slidably positioned in the positioning groove (410) along the depth direction of the positioning groove (410); The force supply compression spring (550) compresses the support frame (520) through its own elastic force so that the cylindrical conductive wheel (510) is closely attached to the inner wall of the support box body (200) or the static contact point (300); A built-in sponge (132) is arranged inside the closed capsule (130); the built-in sponge (132) is a long strip of sponge, and the two closed capsules (130) with the built-in sponges (132) are tightly attached together under normal conditions.

2. The maintenance-free sealed contact system according to claim 1, characterized in that: The closed bag (130) is surrounded by a closed sheet body (131) fixed on the inner wall of the supporting tube (120) and the inner wall of the supporting tube (120); the closed sheet body (131) is a rectangular elastic rubber sheet body, the edge of which is fixed on the inner wall of the supporting tube (120).

3. The maintenance-free sealed contact system according to claim 1, characterized in that: The static contacts (300) on the carrying box body (200) are arranged in two rows, and the two rows of static contacts (300) are arranged one above the other and parallel to each other.

4. The maintenance-free sealed contact system according to claim 1, characterized in that: The movable contact assembly (500) further comprises a floating tube (530) and a fixed rod body (540); The floating tube (530) is a hard tube body, fixed on the support frame (520) and having an axial direction in the same length direction as the moving contact assembly (500); An annular positioning flange (531) is positioned on the side wall of the floating tube (530) near the support frame (520); The fixing rod body (540) is fixed on the inner bottom of the positioning groove (410), and comprises a penetration rod (541) and a fixing plate (542); The fixing plate (542) is a hard plate body, fixed on the inner bottom of the positioning groove (410); the penetration rod (541) is fixed on the fixing plate (542) and inserted into the floating tube (530); One end of the force supply compression spring (550) is tightly attached to the fixing plate (542), and the other end is tightly attached to the positioning flange (531).

5. The maintenance-free sealed contact system according to claim 2, characterized in that: The closing sheet (131) is formed by splicing two long rectangular sheets, namely a first sheet (133) and a second sheet (134); the long sides of the first sheet (133) and the second sheet (134) are spliced ​​together, the first sheet (133) is a plastic soft film, and the second sheet (134) is an elastic rubber sheet; when the external box (100) is closed, the first sheet (133) is exposed to the outside.

6. The maintenance-free sealed contact system according to claim 1, characterized in that: A storage box (240) is fixed on the top of the carrying box body (200), and a color-changing desiccant is placed in the storage box (240). The color-changing desiccant is used to absorb moisture in the external box body (100); the external box body (100) is made of a transparent material.

7. The maintenance-free sealed contact system according to any one of claims 1 to 6, characterized in that: When the air pump is used to inflate the interior of the external box (100), an inert gas is introduced; when inflating, the hard tube body is first inserted into the supporting tube (120), and most of the original gas in the external box (100) is discharged in conjunction with the air pump, and then the hard tube body is pulled out.

8. The maintenance-free sealed contact system according to claim 7, characterized in that: The static contact (300) is provided with a positioning through hole, and the wire connected to the static contact (300) is fixed by bolts and nuts; A plurality of bearing positioning pieces (210) are positioned on the outer wall of the bearing box body (200); the bearing positioning pieces (210) are hard plates, arranged longitudinally, and located between the static contact points (300) for bearing and fixing the elastic strip capsules (600); The load-bearing positioning sheet (210) is provided with a plurality of through holes (220), each of which has the same size and is arranged in a plurality of rows, and the axes of the through holes (220) in the same row coincide with each other and are located above and / or below the static contact (300); The elastic strip bag (600) is a long elastic rubber bag with an opening at one end, the number of which is the same as the number of rows of through holes (220); after the mounting and fixing of the carrier box body (200), an elastic strip bag (600) is inserted into each row of through holes (220); the through holes (220) in the same row are penetrated by the elastic strip bag (600), and then an air pump is used to pump gas into the elastic strip bag (600) to expand it and abut against the bolts and / or nuts used to fix the wires on the static contact (300), and finally the elastic strip bag (600) is closed.

9. The maintenance-free sealed contact system according to claim 8, characterized in that: When gas is injected into the elastic strip bag (600) by an air pump, the elastic strip bag (600) expands and covers the connection position between the wire and the static contact (300); thereafter, when gas is injected into the external box (100), the elastic strip bag (600) contracts under the action of the gas pressure and no longer covers the connection position between the wire and the static contact (300), but only contacts the bolts and / or nuts on the static contact (300) for fixing the wire; Once the external box (100) leaks, the air pressure in the external box (100) decreases, and the elastic strip bag (600) expands under the action of the air pressure to re-cover the connection position between the wire and the static contact (300). At this time, the elastic strip bag (600) also plays a temporary role in preventing dust and water from entering the connection position between the wire and the static contact (300).

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