Low-voltage annular moving and static contact assembly convenient to plug and unplug

Abstract

The invention belongs to the technical field of low-voltage power distribution, and discloses a low-voltage annular moving and static contact assembly convenient to plug and unplug, which comprises a moving contact, a first housing and a second housing, a static contact is arranged at the left end of the moving contact, annular seats are fixed at the outer sides of a first support column and a second support column, buffer assemblies are fixed at the upper ends of the annular seats, and the buffer assemblies are fixed at the lower ends of the first support column and the second support column. A piston rod is fixed to the upper end of the supporting plate, a first air pipe is fixed to the upper end of the first housing, a second air pipe is fixed to the upper end of the second housing, and the inner wall of the first air pipe is in sealing fit with the outer wall of the second air pipe. The air in the air pipe can be compressed by utilizing kinetic energy generated when the drawer is inserted, the positions of the movable and static contacts can be limited, the movable and static contacts are prevented from shaking up and down in the buffer assembly, the compressed air can be released to contact points of the movable and static contacts at the moment when the movable and static contacts are in contact connection, and therefore electric arcs are lengthened and weakened to prevent fire disasters caused by the electric arcs.

Description

Technical Field

[0001] The present invention belongs to the technical field of low-voltage power distribution, and in particular relates to a low-voltage annular moving and stationary contact assembly that is convenient for plugging and unplugging. Background Art

[0002] The moving and static contacts in the distribution cabinet are key electrical components for realizing the on and off of the circuit. The moving contact is installed on a retractable back panel, such as a circuit breaker or contactor, and can engage or separate with the static contact fixed on the distribution cabinet to control the connection status of the circuit.

[0003] For example, the application number is CN202020741615.0, which is a drawer and a pull-out low-voltage distribution cabinet for micro-break switches. The moving contact is fixedly connected to the drawer. When the cabinet is impacted, the two ends of the moving and static contacts are fixed, and the moving and static contacts are plug-in connected. When the cabinet and the drawer shake with different amplitudes, the connection between the moving and static contacts is caused by repeated friction, resulting in poor contact at the contacts, and increased resistance, which leads to additional heat at the connection, which may cause overheating, and unstable connection may generate arcs and sparks between the contacts. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a low-voltage annular moving and static contact assembly that is easy to plug and unplug, which solves the problem in the prior art that when the cabinet is subjected to external impact, the cabinet and the drawer shake at different amplitudes, resulting in poor contact at the connection between the moving and static contacts, and the moving and static contacts have a large resistance at the moment of insertion, which is prone to arcing.

[0005] The purpose of this disclosure can be achieved through the following technical solutions:

[0006] A low-voltage annular movable and stationary contact assembly convenient for plugging and unplugging, comprising: a movable contact, a first cover shell and a second cover shell;

[0007] The right end of the moving contact is coaxially provided with a first support column, and the left end of the moving contact is provided with a stationary contact, and the left end of the stationary contact is coaxially fixed with a second support column;

[0008] An annular seat is fixed to the outer side of each of the first support column and the second support column, a buffer assembly is fixed to the upper end of the annular seat, a support plate is fixed to the outer end of the annular seat, a piston rod is fixed to the upper end of the support plate, a first cover shell is fixed to the outer side of the moving contact, a second cover shell is fixed to the outer side of the static contact, and a movable groove is provided on the outer side of the annular seat that penetrates the first cover shell and the second cover shell respectively, and the path of the movable groove is the same as the moving path of the annular seat;

[0009] A first air pipe is fixed to the upper end of the first housing, and a second air pipe is fixed to the upper end of the second housing, and the inner wall of the first air pipe is sealed with the outer wall of the second air pipe, a large piston is slidably connected to the inner wall of the first air pipe, and the lower end of the first air pipe is sealed with the outer wall of the piston rod, and the first air pipe, the large piston and the piston rod are formed to form a closed space, a small piston is slidably connected to the inner wall of the second air pipe, and the lower end of the second air pipe is sealed with the outer wall of the piston rod, and the second air pipe, the small piston and the piston rod at the lower end of the second air pipe are formed to form a closed space;

[0010] The bottom of the first air pipe is provided with a through hole, and the right end of the through hole is provided with a connecting hole, the bottom of the second air pipe is provided with a through hole, and the upper end of the second cover shell is provided with an air hole, and the air hole is located directly below the through hole;

[0011] A first sealing assembly is fixed on the inner side of the perforation, and the first sealing assembly includes a first sealing cover, a first rotating cylinder, a first support rod and a first groove. A first support rod is fixed on the inner side of the perforation, and a first rotating cylinder is coaxially fixed on the outer side of the first support rod. The upper end of the first rotating cylinder is slidably connected with a first sealing cover, and a first groove is fixed on a side of the first sealing cover close to the first rotating cylinder.

[0012] In some disclosures, a threaded protrusion is fixed to the outer side of the moving contact, and a nut is threadedly connected to the outer side of the threaded protrusion, and a fixing plate is fixed to one end of the first cover shell away from the stationary contact.

[0013] In some disclosures, a plurality of mounting holes are provided through the inner side of the fixed plate, and a plurality of through slots are provided through the inner side of the fixed plate, and the positions of the through slots are parallel to the positions of the movable slots, and a plurality of groups of the first cover shell and the horizontal array of moving contacts are provided.

[0014] In some disclosures, an arc-shaped pressure piece is inserted into the side of the static contact close to the moving contact, and the arc-shaped pressure piece is arranged in an array about the central axis of the static contact, two arc-shaped grooves are arranged on the outer side of the arc-shaped pressure piece, and the outer peripheries of the two arc-shaped grooves are both sleeved with non-magnetic springs.

[0015] In some disclosures, a fixing seat is fixed to the outer side of the first air pipe and the second air pipe, and bolt holes are provided on both sides of the fixing seat. A baffle is fixed to the side of the fixing plate close to the first cover shell, and a plurality of positioning holes are provided through the upper end of the baffle.

[0016] In some disclosures, a fixing hole penetrating the side wall of the first housing is provided directly below the positioning hole, and a bolt is provided through the positioning hole, the bolt hole and the fixing hole in sequence.

[0017] In some disclosures, a connecting hole passing through the first cover shell is provided at the right end of the through hole, and a sliding groove is provided on the inner side of the connecting hole, and a second sealing assembly is slidingly provided inside the connecting hole, and the second sealing assembly includes a second sealing cover, a second support rod, a second rotating cylinder and a second groove, a second sealing cover is slidingly connected to the inner side of the sliding groove, and a second groove is fixed on the upper end of the second sealing cover, and a second support rod is fixed on one side of the second groove, and the curvature of the second groove is the same as the curvature of the outer wall of the second rotating cylinder, and a second rotating cylinder is fixed on the outer side of the second support rod.

[0018] In some disclosures, the buffer assembly includes an arc plate, a sleeve and a support spring, and the upper end of the annular seat is fixed with an arc plate, the upper end surface of the arc plate is fixed with two sleeves, and support springs are provided on the outer sides of the two sleeves.

[0019] In some disclosures, a rubber pad is fixed to the bottom end of the movable groove, and the bottom side of the arc-shaped plate is in contact with the outer wall of the annular seat.

[0020] In some disclosures, a grid plate is fixed to the inner wall of the second cover shell, and the grid plate is located directly below the air hole.

[0021] The nouns, conjunctions or adjectives involved in the above technical solution are explained as follows:

[0022] A fixed connection is one where the parts or components are fixed without any relative movement;

[0023] A rotational connection is a connection between parts that allows the parts to rotate relative to each other;

[0024] Threaded connection is a detachable fixed connection with the advantages of simple structure, reliable connection, and convenient assembly and disassembly. It is widely used in the fields of mechanical engineering and connection structures.

[0025] A sliding connection is a connection between parts that allows the parts to slide against each other.

[0026] Beneficial effects of the present disclosure:

[0027] 1. By arranging the first air pipe and the second air pipe to be sealed and inserted into each other to form a sealed air pipe, the kinetic energy when the drawer is inserted can be used to compress the air in the air pipe, which can not only limit the position of the moving and static contacts to avoid shaking up and down in the buffer assembly, but also release the compressed air to the contact point of the moving and static contacts at the moment when the moving and static contacts are in contact and connected, thereby lengthening the arc and weakening it to prevent fire caused by the arc;

[0028] 2. When the cabinet shakes violently, the spring and the buffer layer are used to absorb the kinetic energy generated by the shaking. When the spring shakes up and down, it can drive the pistons at both ends of the compressed air pipe to move up and down, so that the gas in the compressed air pipe enters and is blown out from the outlet of the moving and static contacts, which can cool down the moving and static contacts when they rub against each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 is a schematic diagram of the explosion structure of the first cover shell and the moving contact in the embodiment of the present disclosure;

[0031] Figure 2 is a schematic diagram of the connection structure between the first cover shell and the second cover shell of the embodiment of the present disclosure;

[0032] Figure 3 In the present disclosure embodiment Figure 2 A top view of a

[0033] Figure 4 In the present disclosure embodiment Figure 3 AA section diagram in;

[0034] Figure 5 In the present disclosure embodiment Figure 4 The enlarged structural diagram at B in the middle;

[0035] Figure 6 In the present disclosure embodiment Figure 4 The enlarged structural diagram at C in the middle;

[0036] Figure 7 is a schematic diagram of the overall structure of an embodiment of the present disclosure;

[0037] Figure 8 is a schematic diagram of the connection structure of the moving and static contacts of an embodiment of the present disclosure;

[0038] Fig. 9 is a schematic structural diagram of a first sealing cover according to an embodiment of the present disclosure;

[0039] In the figure: 1, moving contact; 101, threaded protrusion; 102, nut; 103, first support column; 2, static contact; 21, arc-shaped pressing piece; 22, arc-shaped groove; 23, non-magnetic spring; 201, second support column; 3, annular seat; 31, support plate; 32, piston rod; 4, arc-shaped plate; 41, sleeve; 42, support spring; 5, first cover; 51, fixing hole; 6, second cover; 61, air hole; 62, grid plate; 7, movable groove; 71, rubber pad; 8, fixing seat; 81, bolt hole; 9, The first air pipe; 91, large piston; 92, through hole; 93, connecting hole; 931, sliding groove; 10, second air pipe; 1001, small piston; 1002, perforation; 11, first sealing cover; 111, first rotating cylinder; 112, first support rod; 113, first groove; 12, second sealing cover; 121, second support rod; 122, second rotating cylinder; 123, second groove; 13, fixing plate; 131, through groove; 132, mounting hole; 133, baffle; 1331, positioning hole; 14, bolt. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0041] According to the concept of this application, Figures 1 to 9 To describe an embodiment of a low-voltage annular moving and static contact assembly that is easy to plug and unplug. Specifically, the low-voltage annular moving and static contact assembly that is easy to plug and unplug is constructed as a split structure, which has three components, namely a first air pipe 9, a second air pipe 10 and a buffer assembly. By arranging the first air pipe and the second air pipe to be sealed and inserted into each other to form a sealed air pipe, the kinetic energy when the drawer is inserted can be used to compress the air in the air pipe, which can not only limit the position of the moving and static contacts to avoid shaking up and down in the buffer assembly, but also release the compressed air to the contact point of the moving and static contacts at the moment when the moving and static contacts are in contact and connected, thereby lengthening the arc and weakening it to prevent fires caused by the arc.

[0042] Please refer to Figures 1 to 9 , a low-voltage annular moving and stationary contact assembly convenient for plugging and unplugging, comprising: a moving contact 1, a first cover shell 5 and a second cover shell 6;

[0043] The right end of the moving contact 1 is coaxially provided with a first support column 103, and the left end of the moving contact 1 is provided with a stationary contact 2, and the left end of the stationary contact 2 is coaxially fixed with a second support column 201;

[0044] An annular seat 3 is fixed to the outer side of the first support column 103 and the second support column 201, a buffer assembly is fixed to the upper end of the annular seat 3, a support plate 31 is fixed to the outer end of the annular seat 3, a piston rod 32 is fixed to the upper end of the support plate 31, a first cover shell 5 is fixed to the outer side of the moving contact 1, a second cover shell 6 is fixed to the outer side of the static contact 2, and a movable groove 7 penetrating the first cover shell 5 and the second cover shell 6 is provided on the outer side of the annular seat 3, and the path of the movable groove 7 is the same as the moving path of the annular seat 3;

[0045] A first air pipe 9 is fixed to the upper end of the first cover shell 5, and a second air pipe 10 is fixed to the upper end of the second cover shell 6, and the inner wall of the first air pipe 9 is sealed with the outer wall of the second air pipe 10, the inner wall of the first air pipe 9 is slidably connected with a large piston 91, and the lower end of the first air pipe 9 is sealed with the outer wall of the piston rod 32, and the first air pipe 9, the large piston 91 and the piston rod 32 cooperate to form a closed space, the inner wall of the second air pipe 10 is slidably connected with a small piston 1001, and the lower end of the second air pipe 10 is sealed with the outer wall of the piston rod 32, and the second air pipe 10, the small piston 1001 and the piston rod 32 at the lower end of the second air pipe 10 cooperate to form a closed space;

[0046] A through hole 92 is provided at the bottom of the first air pipe 9, and a connecting hole 93 is provided at the right end of the through hole 92. A through hole 1002 is provided at the bottom of the second air pipe 10, and an air hole 61 is provided at the upper end of the second housing 6, and the air hole 61 is located directly below the through hole 1002.

[0047] A first sealing assembly is fixed to the inner side of the through hole 1002, and the first sealing assembly includes a first sealing cover 11, a first rotating cylinder 111, a first support rod 112 and a first groove 113. A first support rod 112 is fixed to the inner side of the through hole 1002, and the first rotating cylinder 111 is coaxially fixed to the outer side of the first support rod 112. The first sealing cover 11 is slidably connected to the upper end of the first rotating cylinder 111, and a first groove 113 is fixed to the side of the first sealing cover 11 close to the first rotating cylinder 111.

[0048] Insert the first support column 103 of the moving contact 1 and the second support column 201 on the stationary contact 2 into the two annular seats 3 respectively, and insert the piston rod 32 on the annular seat 3 into the lower ends of the first air pipe 9 and the second air pipe 10 respectively, and the damping liquid is filled between the piston rod 32 and the large piston 91 in the first air pipe 9, and the damping liquid is also filled between the piston rod 32 and the small piston 1001 in the second air pipe 10;

[0049] When the first cover shell 5 is driven, bolt holes 81 are provided on both sides of the fixing seat 8 , a baffle 133 is fixed to one side of the fixing plate 13 close to the first cover shell 5 , and a plurality of positioning holes 1331 are penetrated through the upper end of the baffle 133 .

[0050] A fixing hole 51 penetrating the side wall of the first housing 5 is provided directly below the positioning hole 1331 , and the bolt 14 is provided through the positioning hole 1331 , the bolt hole 81 and the fixing hole 51 in sequence.

[0051] During installation, the bolt 14 is passed through the positioning hole 1331, the bolt hole 81 and the fixing hole 51 in sequence, and the nut seat is screwed on the bottom of the bolt 14, so as to fix the fixing plate 13, the first air pipe 9 and the first cover shell 5, thereby improving the synchronization of movement among the three, allowing multiple moving contacts 1 to be inserted into the static contact 2 at the same time, and the first cover shell 5 and the second cover shell 6 can both provide protection for the moving and static contacts.

[0052] The buffer assembly includes an arc plate 4, a sleeve 41 and a support spring 42, and the arc plate 4 is fixed to the upper end of the annular seat 3, two sleeves 41 are fixed to the upper end surface of the arc plate 4, and support springs 42 are arranged on the outer sides of the two sleeves 41, a rubber pad 71 is fixed to the bottom end of the movable groove 7, and the bottom side of the arc plate 4 is in contact with the outer wall of the annular seat 3.

[0053] When the annular seat 3 slides up and down, it can drive the sleeve 41 and the support spring 42 to contract through the arc plate 4, so that there is a certain amount of activity between the annular seat 3 and the moving and static contacts and the first cover shell 5. The moment the drawer is pushed in and contacts the guide rail, an impact force will be generated, resulting in a certain impact force when the moving and static contacts are connected. The support spring 42 stores the external impact force, and this part of the impact force can be transmitted to the piston rod 32 through the support plate 31, and the part of the kinetic energy is absorbed by the damping liquid. In addition, the piston rod 32 can cause the air in the air pipe to spray toward the moving and static contacts during the sliding process, thereby cooling the connection between the moving and static contacts.

[0054] A grid plate 62 is fixed to the inner wall of the second cover shell 6, and the grid plate 62 is located directly below the air hole 61. When an arc occurs directly below the moving and static contacts, the airflow blown out of the air hole 61 will blow downward along the outer wall of the arc-shaped pressing plate 21. Since the airflow loses part of its kinetic energy when moving downward, the wind velocity is relatively small at this time. The grid plate 62 protruding upward can shorten the length of the arc stretched outward when the arc is extinguished. When the arc contacts the grid plate 62, the arc can be divided into multiple sections and directly heat conducted to quickly reduce the temperature of the arc, thereby achieving the effect of arc extinguishing.

[0055] A connecting hole 93 passing through the first cover shell 5 is provided at the right end of the through hole 92, and a sliding groove 931 is provided on the inner side of the connecting hole 93, and a second sealing assembly is slidingly provided inside the connecting hole 93, and the second sealing assembly includes a second sealing cover 12, a second support rod 121, a second rotating cylinder 122 and a second groove 123, the second sealing cover 12 is slidingly connected to the inner side of the sliding groove 931, and the second groove 123 is fixed on the upper end of the second sealing cover 12, and the second support rod 121 is fixed on one side of the second groove 123, and the curvature of the second groove 123 is the same as the curvature of the outer wall of the second rotating cylinder 122, and the second rotating cylinder 122 is fixed on the outer side of the second support rod 121.

[0056] The working principle of the second sealing assembly is the same as that of the first sealing assembly. When the drawer is pushed inward, the second rotating cylinder 122 is driven by the friction of the outer wall of the second air pipe 10 to rotate clockwise, thereby pushing the second sealing cover 12 to slide along the sliding groove 931 until the second groove 123 fits with the second rotating cylinder 122. At the same time, since the right end of the second air pipe 10 is not aligned with the right end of the second cover shell 6, the space on the upper and lower sides of the connecting hole 93 is connected when the second sealing cover 12 slides. Since the upper end of the second cover shell 6 is longer than the second air pipe 10, the lower end surface of the connecting hole 93 is still blocked by the second cover shell 6 when the second sealing cover 12 is opened, so as to maintain the sealing inside the air pipe. When the drawer is completely pushed in When the cabinet is in the cabinet, the central axes of the through hole 1002, the connecting hole 93 and the air hole 61 coincide with each other. When the cabinet shakes, the moving contact 1, the static contact 2 and the annular seat 3 are driven to slide up and down along the movable groove 7, and the piston rod 32 is driven to slide up and down along the two ends of the air pipe, so that the air in the air pipe repeatedly enters and exits the through hole 1002, the connecting hole 93 and the air hole 61, so that the connection between the moving and static contacts can be cooled by blowing when the contact is unstable. Moreover, since the static contact 2 and the moving contact 1 are both annularly connected, compared with the card-type two-point contact method, the contact method of the annular moving contact 1 and the cylindrical static contact 2 is changed to the contact method of the matching, and the point contact is changed to the annular surface contact, which is beneficial to increase the contact area and improve the stability of the current passing through.

[0057] In the following, in conjunction with the accompanying drawings and implementation modes, a low-voltage annular movable and stationary contact assembly that is convenient for plugging and unplugging provided by the present invention is further described.

[0058] When in use, the bolt 14 is passed through the positioning hole 1331, the bolt hole 81 and the fixing hole 51 in sequence, and the nut seat is screwed on the bottom of the bolt 14, so as to fix the fixing plate 13, the first air pipe 9 and the first cover shell 5. The first support column 103 of the moving contact 1 and the second support column 201 on the static contact 2 are respectively inserted into the two annular seats 3, and the piston rod 32 on the annular seat 3 is respectively inserted into the lower ends of the first air pipe 9 and the second air pipe 10, and then the drawer is fixed to the fixing plate 13 by fastening parts through the mounting hole 132 on the fixing plate 13, and the static contact 2 is fixed at a horizontal position between the inner wall of the cabinet and the moving contact 1.

[0059] Push the drawer into the cabinet body and slide it horizontally inward until the first cover shell 5 is inserted into the outer side of the second cover shell 6, and then the first air pipe 9 is inserted into the outer side of the second air pipe 10. At this time, a sealed air pipe is formed between the first air pipe 9 and the second air pipe 10. The air in the air pipe will be compressed during the insertion of the drawer, and the air pressure in the air pipe increases and pushes the large piston 91 and the small piston 1001 outward on both sides, and pushes the piston rod 32 downward through the damping fluid, so that the two annular seats 3 are moved to the bottom of the movable groove 7, so that the central axis of the moving contact 1 and the static contact 2 coincide, thereby automatically adjusting the position of the moving and static contacts.

[0060] As the drawer continues to go deeper, the inner wall of the first air pipe 9 contacts the first rotating cylinder 111, and the friction force drives the first rotating cylinder 111 to rotate clockwise, and the first rotating cylinder 111 drives the first sealing cover 11 to slide rightward along the inner wall of the second air pipe 10 through the friction force, until the first groove 113 at the bottom of the first sealing cover 11 fits with the outer wall of the first rotating cylinder 111, and at this time, the central axis of the air hole 61, the through hole 92 and the through hole 1002 coincides, so that the compressed air in the air pipe will be ejected from the air outlet 61 to the connection between the moving and static contacts, and the airflow blown from the air outlet 61 is blown to the moving and static contacts through the airflow arc blowing method, and the moving and static contacts are cooled. Then the second air pipe 10 and the second rotating cylinder 122 rotate clockwise, thereby pushing the second sealing cover 12 to slide along the sliding groove 931 until the second groove 123 fits with the second rotating cylinder 122. At this time, the second sealing assembly is in an open state, but the bottom end of the connecting hole 93 is blocked by the upper wall of the second cover shell 6, so that the air pipe is still in a sealed state until the drawer is pushed in. At this time, the moving contact 1 is completely inserted into the static contact 2, and the non-magnetic spring 23 and the arc-shaped pressing sheet 21 on the outside of the static contact 2 force the contact surfaces of the moving and static contacts to contact evenly, thereby completing the connection between the moving and static contacts. At this time, the third hole of the through hole 1002, the connecting hole 93 and the air hole 61 coincide, so that the airway is connected to the second cover shell 6.

[0061] When the cabinet and the drawer are shaken, the support spring 42 and the rubber pad 71 are used to absorb the kinetic energy generated by the shaking. The support spring 42 can drive the piston rod 32 on the annular seat 3 to slide up and down along the air pipe when it shakes up and down. Due to the change of the space in the air pipe, the internal gas enters and is blown out from the air hole 61 and sprayed to the connection between the moving and static contacts, so that the temperature can be reduced when the moving and static contacts rub against each other.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0063] The above shows and describes the basic principles, main features and advantages of the present disclosure. Those skilled in the art should understand that the present disclosure is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present disclosure. Without departing from the spirit and scope of the present disclosure, the present disclosure may have various changes and improvements, and these changes and improvements fall within the scope of the present disclosure to be protected.

Claims

1. A low-voltage annular moving and stationary contact assembly that is easy to plug and unplug, characterized in that: include: A moving contact (1), a first cover shell (5) and a second cover shell (6); The right end of the moving contact (1) is coaxially provided with a first support column (103), the left end of the moving contact (1) is provided with a stationary contact (2), and the left end of the stationary contact (2) is coaxially fixed with a second support column (201); An annular seat (3) is fixed to the outer side of each of the first support column (103) and the second support column (201), a buffer assembly is fixed to the upper end of the annular seat (3), a support plate (31) is fixed to the outer end of the annular seat (3), a piston rod (32) is fixed to the upper end of the support plate (31), a first cover shell (5) is fixed to the outer side of the moving contact (1), a second cover shell (6) is fixed to the outer side of the stationary contact (2), and a movable groove (7) is provided on the outer side of the annular seat (3) and passes through the first cover shell (5) and the second cover shell (6) respectively, and the path of the movable groove (7) is the same as the moving path of the annular seat (3); A first air pipe (9) is fixed to the upper end of the first housing (5), and a second air pipe (10) is fixed to the upper end of the second housing (6), and the inner wall of the first air pipe (9) is sealed with the outer wall of the second air pipe (10), the inner wall of the first air pipe (9) is slidably connected to a large piston (91), and the lower end of the first air pipe (9) is sealed with the outer wall of a piston rod (32), and the first air pipe (9), the large piston (91) and the piston rod (32) are formed together to form a closed space, the inner wall of the second air pipe (10) is slidably connected to a small piston (1001), and the lower end of the second air pipe (10) is sealed with the outer wall of the piston rod (32), and the second air pipe (10), the small piston (1001) and the piston rod (32) at the lower end of the second air pipe (10) are formed together to form a closed space; A through hole (92) is provided through the bottom of the first air pipe (9), and a connecting hole (93) is provided at the right end of the through hole (92); a through hole (1002) is provided through the bottom of the second air pipe (10), and an air hole (61) is provided through the upper end of the second cover shell (6), and the air hole (61) is located directly below the through hole (1002); A first sealing assembly is fixed on the inner side of the through hole (1002), and the first sealing assembly comprises a first sealing cover (11), a first rotating cylinder (111), a first support rod (112) and a first groove (113); a first support rod (112) is fixed on the inner side of the through hole (1002), and a first rotating cylinder (111) is coaxially fixed on the outer side of the first support rod (112); the first sealing cover (11) is slidably connected to the upper end of the first rotating cylinder (111), and a first groove (113) is fixed on a side of the first sealing cover (11) close to the first rotating cylinder (111).

2. A low-voltage annular moving and stationary contact assembly that is easy to plug and unplug according to claim 1, characterized in that: A threaded protrusion (101) is fixed on the outer side of the moving contact (1), and a nut (102) is threadedly connected to the outer side of the threaded protrusion (101), and a fixing plate (13) is fixed to one end of the first cover shell (5) away from the stationary contact (2).

3. A low-voltage annular moving and stationary contact assembly that is easy to plug and unplug according to claim 1, characterized in that: The inner side of the fixed plate (13) is provided with a plurality of mounting holes (132) penetrating therethrough, and the inner side of the fixed plate (13) is provided with a plurality of through slots (131) penetrating the fixed plate (13), and the positions of the through slots (131) are parallel to the positions of the movable slots (7), and the first cover shell (5) and the movable contacts (1) are provided in a plurality of groups in a horizontal array.

4. A low-voltage annular moving and stationary contact assembly that is easy to plug and unplug according to claim 2, characterized in that: An arc-shaped pressing piece (21) is inserted into the side of the static contact (2) close to the dynamic contact (1), and the arc-shaped pressing piece (21) is arranged in an array about the central axis of the static contact (2), two arc-shaped grooves (22) are arranged on the outer side of the arc-shaped pressing piece (21), and the outer peripheries of the two arc-shaped grooves (22) are both sleeved with non-magnetic springs (23).

5. The low-voltage annular moving and stationary contact assembly that is easy to plug and unplug according to claim 3, characterized in that: A fixing seat (8) is fixed to the outer side of each of the first air pipe (9) and the second air pipe (10), and bolt holes (81) are provided on both sides of the fixing seat (8); a baffle (133) is fixed to the side of the fixing plate (13) close to the first cover shell (5), and a plurality of positioning holes (1331) are provided through the upper end of the baffle (133).

6. A low-voltage annular moving and stationary contact assembly that is easy to plug and unplug according to claim 5, characterized in that: A fixing hole (51) penetrating the side wall of the first housing (5) is arranged directly below the positioning hole (1331), and the bolt (14) is arranged to pass through the positioning hole (1331), the bolt hole (81) and the fixing hole (51) in sequence.

7. The low-voltage annular moving and stationary contact assembly that is easy to plug and unplug according to claim 1, characterized in that: A connecting hole (93) penetrating the first cover shell (5) is arranged at the right end of the through hole (92), and a sliding groove (931) is arranged on the inner side of the connecting hole (93), and a second sealing assembly is slidingly arranged inside the connecting hole (93), and the second sealing assembly comprises a second sealing cover (12), a second support rod (121), a second rotating cylinder (122) and a second groove (123), the inner side of the sliding groove (931) is slidingly connected with the second sealing cover (12), and the upper end of the second sealing cover (12) is fixed with the second groove (123), and a second support rod (121) is fixed on one side of the second groove (123), and the curvature of the second groove (123) is the same as the curvature of the outer wall of the second rotating cylinder (122), and the second rotating cylinder (122) is fixed on the outer side of the second support rod (121).

8. The low-voltage annular moving and stationary contact assembly that is easy to plug and unplug according to claim 1, characterized in that: The buffer assembly comprises an arc-shaped plate (4), a sleeve (41) and a support spring (42), wherein the upper end of the annular seat (3) is fixed with the arc-shaped plate (4), the upper end surface of the arc-shaped plate (4) is fixed with two sleeves (41), and the outer sides of the two sleeves (41) are both provided with support springs (42).

9. A low-voltage annular moving and stationary contact assembly that is easy to plug and unplug according to claim 8, characterized in that: A rubber pad (71) is fixed to the bottom end of the movable groove (7), and the bottom side of the arc-shaped plate (4) is in contact with the outer wall of the annular seat (3).

10. The low-voltage annular moving and stationary contact assembly that is easy to plug and unplug according to claim 1, characterized in that: A grid plate (62) is fixed to the inner wall of the second cover shell (6), and the grid plate (62) is located directly below the air hole (61).

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