Drawing type switch cabinet

Abstract

The invention belongs to the technical field of power distribution equipment, and particularly discloses a pull-out switch cabinet which comprises a cabinet body and drawer units, a plurality of mounting grooves are formed in the cabinet body, one drawer unit can be mounted in each mounting groove, and a state switching hand wheel is arranged on each drawer unit. By arranging the middle rod capable of rotating and moving back and forth along the axis, the action of the middle rod is controlled by operating the state switching hand wheel in the process of plugging and unplugging the fan-shaped plug-in. The arc-shaped conductor is not in contact with the built-in conductor, when the arc-shaped conductor is inserted into the innermost end of the conductive groove, the middle rod is moved through the axis, and the arc-shaped conductor moves along with the arc-shaped conductor, gets close to the built-in conductor and then is in contact with the built-in conductor, so that frequent relative displacement between the arc-shaped conductor and the built-in conductor caused by frequent plugging operation is avoided; abrasion of a conductor contact surface is greatly reduced, maintenance cost is reduced, and stability of an electric power system is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of power distribution equipment, and in particular relates to a pull-out switch cabinet. Background Art

[0002] As a key switchgear in the power system, the pull-out switchgear is widely used in the power industry due to its easy installation, maintenance and replacement. In the process of controlling the switching of the connection status of the main circuit and the secondary circuit, the pull-out switchgear needs to control the plug-in or plug-in by rotating the state switching handwheel to realize the conversion between the working state and the isolation state. Although this design meets the basic operation requirements, it has certain technical deficiencies.

[0003] Frequent plugging and unplugging operations will cause frequent relative displacement between the plug and the socket, which will cause wear of the conductor. This will not only reduce the stability and service life of the equipment, but also increase the contact resistance, leading to poor contact and heating problems. The friction process may even generate metal dust and electric sparks. These problems not only affect the stable operation of the switch cabinet, but may also cause safety accidents. At the same time, the wear of the conductor also increases the maintenance cost, and it needs to be replaced regularly. The replacement process requires downtime, which affects the continuous power supply of the power system. Summary of the invention

[0004] In view of the above-mentioned defects, the purpose of the present invention is to provide a pull-out switch cabinet, which is provided with an intermediate rod that can rotate and move forward and backward along the axis, and the operation state switching hand wheel is used to control the movement of the intermediate rod. In the process of plugging and unplugging the fan-shaped plug-in, the arc-shaped conductor and the built-in conductor do not contact each other. When the arc-shaped conductor is inserted into the innermost end of the conductive slot, the intermediate rod is moved by the axis, and the arc-shaped conductor follows the movement and approaches the built-in conductor, and then contacts the built-in conductor, thereby avoiding frequent relative displacement between the arc-shaped conductor and the built-in conductor caused by frequent plug-in and unplug operations, greatly reducing the wear of the contact surface of the conductor, reducing maintenance costs, and improving the stability of the power system.

[0005] In order to achieve the above-mentioned object, the present invention provides a pull-out switch cabinet, including a cabinet body and a drawer unit, wherein a plurality of mounting grooves are provided on the cabinet body, wherein a drawer unit can be installed in each mounting groove, and a state switching hand wheel is provided on the drawer unit. An intermediate rod is installed on the drawer unit, and the intermediate rod horizontally passes through the entire drawer unit front and back, and the intermediate rod can rotate along the axis and can move forward and backward along the axis. A state switching hand wheel is installed at the front end of the intermediate rod, and a fan-shaped plug-in is provided at the rear. A fan-shaped socket is provided in the mounting groove, and the fan-shaped plug-in and the fan-shaped socket are coaxial with the intermediate rod. An arc-shaped conductor is provided on the fan-shaped plug-in, and a conductive groove is provided on the fan-shaped socket. By rotating the intermediate rod, the arc-shaped conductor can be inserted into or pulled out of the conductive groove. A built-in conductor is provided in the conductive groove. When the fan-shaped plug-in rotates, the arc-shaped conductor and the built-in conductor do not contact each other. When the arc-shaped conductor is inserted into the innermost end of the conductive groove, the intermediate rod is moved through the axis, and the arc-shaped conductor follows the movement and approaches the built-in conductor, and then contacts the built-in conductor.

[0006] Furthermore, the fan-shaped plug-in includes a main circuit plug-in and a secondary circuit plug-in, and the fan-shaped socket is provided with a main circuit conductive groove and a secondary circuit conductive groove respectively. The secondary circuit plug-in is closer to the fan-shaped socket than the main circuit plug-in, so that the electrical connection with the fan-shaped socket is completed earlier when plugged in. The secondary circuit plug-in can rotate around the axis of the middle rod, and a first spring is provided between the secondary circuit plug-in and the middle rod. The first spring causes the secondary circuit plug-in to be located at an angle position closer to the fan-shaped socket, and by squeezing the first spring, the secondary circuit plug-in can rotate to the same angle position as the main circuit plug-in.

[0007] Furthermore, the built-in conductor has elasticity. A second spring is arranged between the middle rod and the main body of the drawer unit, and the second spring tends to push the middle rod to one side along the axial direction, and the side is set as the reset side, and the opposite side is the resetting side. A convex block is arranged on the side of the rear end of the middle rod, and a cylindrical groove is provided on the inner end face of the installation groove. When the drawer unit is installed in place in the installation groove, the rear end of the middle rod is located in the cylindrical groove and the two are coaxial. A straight groove is provided on the inner side wall of the cylindrical groove to cooperate with the convex block, and the straight groove is parallel to the axis. The rear end of the straight groove is connected to the state switching groove. The state switching groove extends in the circumferential direction, and the extension direction is the same as the rotation direction when the fan-shaped plug-in is plugged in, and a first inclined surface, a second inclined surface, and a card slot are sequentially arranged along the extension direction. The first inclined surface is inclined toward the resetting side, and the entire second inclined surface has a drop relative to the end point of the first inclined surface toward the reset side. The second inclined surface is also inclined toward the resetting side, and the card slot has a drop relative to the end point of the second inclined surface toward the reset side. When the protrusion is located at the starting point of the first inclined surface, the fan-shaped plug-in is not plugged into the fan-shaped socket; when the protrusion moves inward along the first inclined surface, the secondary circuit plug-in is gradually inserted into the secondary circuit conductive groove, and the arc-shaped conductor of the secondary circuit plug-in does not contact the built-in conductor of the secondary circuit conductive groove; when the protrusion is located on the second inclined surface, the intermediate rod drives the fan-shaped plug-in to move toward the reset side, so that the arc-shaped conductor of the secondary circuit plug-in approaches the built-in conductor of the secondary circuit conductive groove and contacts it; when the protrusion moves inward along the second inclined surface, the main circuit plug-in is gradually inserted into the main circuit conductive groove, and the arc-shaped conductor of the main circuit plug-in does not contact the built-in conductor of the main circuit conductive groove; when the protrusion is located in the card slot, the intermediate rod drives the fan-shaped plug-in to move toward the reset side, so that the arc-shaped conductor of the main circuit plug-in approaches the built-in conductor of the main circuit conductive groove and contacts it.

[0008] Furthermore, a threading opening is provided on the side of the middle rod, and the wires of the components in the drawer unit can pass through the threading opening to establish an electrical connection with the fan-shaped plug-in.

[0009] Furthermore, it also includes a purge assembly. The purge assembly includes a one-way air outlet pipe and an air chamber and a piston that cooperate with each other. The piston is in sealed sliding contact with the inner wall of the air chamber, and the movement of the piston changes the effective volume in the air chamber. The inlet end of the one-way air outlet pipe is connected to the air chamber. When the drawer unit is installed in place in the installation groove, the outlet end of the one-way air outlet pipe faces the purge hole opened on the fan-shaped socket, and the purge hole is connected to the inner end of each conductive groove.

[0010] Furthermore, the purge assembly also includes a one-way air intake filter, which allows external air to enter the air chamber after being filtered.

[0011] Furthermore, a push rod is fixed in the installation groove, and when the drawer unit is installed in the installation groove from outside to inside, the push rod pushes the piston to move, so that the effective volume of the air chamber is reduced. An elastic component is arranged between the air chamber and the piston, and the elastic component tends to cause the piston to move in the direction of increasing the effective volume of the air chamber.

[0012] Furthermore, the air chamber is arc-shaped, and a pushing structure is fixed on the middle rod. When the middle rod is rotated to a specific angle, the pushing structure can push the piston to slide in the air chamber.

[0013] Furthermore, there are two sets of purge assemblies. There are two purge holes, including a main circuit purge hole connected to each main circuit conductive slot, and a secondary circuit purge hole connected to each secondary circuit conductive slot. The outlets of the one-way air outlet pipes of the two sets of purge assemblies are respectively aligned with the main circuit purge hole and the secondary circuit purge hole. When the main circuit plug-in is plugged in, the corresponding purge assembly purges the main circuit conductive slot; when the secondary circuit plug-in is plugged in, the corresponding purge assembly purges the secondary circuit conductive slot.

[0014] Compared with the prior art, the present invention has at least the following beneficial effects:

[0015] 1. The present invention sets an intermediate rod that can rotate and move forward and backward along the axis, and controls the movement of the intermediate rod by operating the state switching hand wheel. In the process of plugging and unplugging the fan-shaped plug-in, the arc-shaped conductor and the built-in conductor do not contact each other. When the arc-shaped conductor is inserted into the innermost end of the conductive slot, the intermediate rod is moved by the axis, and the arc-shaped conductor follows and moves close to the built-in conductor, and then contacts the built-in conductor, thereby avoiding frequent relative displacement between the arc-shaped conductor and the built-in conductor caused by frequent plugging and unplugging operations, greatly reducing the wear of the contact surface of the conductor, reducing maintenance costs, and improving the stability of the power system.

[0016] 2. The present invention utilizes the cooperation between the state switching groove and the convex block, and the state switching hand wheel can be turned to switch different connection states. When disconnecting the circuit, it is necessary to press the state switching hand wheel inward while rotating it to prevent the circuit from being disconnected by mistake. The above process is coordinated with the cooperation of the main circuit plug-in, the secondary circuit plug-in, the main circuit conductive groove and the secondary circuit conductive groove, which can easily complete the connection state switching while avoiding the friction between the arc conductor and the built-in conductor.

[0017] 3. The second embodiment of the present invention utilizes the installation action of the drawer unit to push the piston to squeeze the air chamber, and blow the clean air in the air chamber into the purge hole, thereby purging each conductive slot, and blowing away impurities such as floating dust and solid particles that may exist in the conductive slot, so as to prevent impurities from wearing the conductor, better protect the arc-shaped conductor and the built-in conductor, and enhance the stability of the electrical connection. At the same time, the action of the push rod pushing the piston to squeeze the spring and air can produce a damping effect before the drawer unit is installed in place, preventing violent installation from damaging the equipment, and making it more advanced.

[0018] 4. Embodiment 3 of the present invention utilizes the action of rotating the state switching hand wheel when the circuit is connected to trigger the purge action, and further sets the purge components into two sets, and the purge action of each set of purge components is carried out simultaneously with the plugging action of the corresponding plug-in and the conductive slot, so that the air can only be discharged through the gap between the arc conductor and the conductive slot, thereby reducing the flow area, increasing the air flow rate, and thus enhancing the purge effect, and while purging the conductive slot, the arc conductor can also be purged. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional diagram of a pull-out switch cabinet of the present invention;

[0020] Figure 2 It is a three-dimensional diagram of the cabinet of the present invention;

[0021] Figure 3 This is a disassembly diagram of the cabinet of the present invention;

[0022] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0023] Figure 5 is a first stereoscopic view of a drawer unit of the present invention;

[0024] Figure 6 is a second stereoscopic view of the drawer unit of the present invention;

[0025] Figure 7 is a third stereoscopic view of the drawer unit of the present invention;

[0026] Figure 8 is a disassembled diagram of the drawer unit of the present invention;

[0027] Fig. 9 is another disassembled diagram of the drawer unit of the present invention;

[0028] Fig.10 This is a disassembly diagram of the middle rod of the present invention;

[0029] Fig.11 A three-dimensional diagram of a fan-shaped socket of the present invention;

[0030] Fig.12 For the present invention Figure 4 A three-dimensional diagram of the structure inside the middle installation slot;

[0031] Fig.13 For the present invention Figure 4 Another three-dimensional view of the structure inside the middle installation slot;

[0032] Fig.14 This is a disassembled diagram of the air chamber of the second embodiment of the present invention;

[0033] Fig.15 It is a schematic diagram of the plugging and unplugging process of the conductive slot and the arc-shaped conductive body of the present invention;

[0034] Fig.16 It is a schematic diagram of the state when the conductive slot of the present invention is electrically connected to the arc-shaped conductive body;

[0035] Fig.17 It is a three-dimensional diagram of the internal structure of the drawer unit of the third embodiment of the present invention;

[0036] Fig.18 It is another three-dimensional diagram of the internal structure of the drawer unit of the third embodiment of the present invention;

[0037] Fig.19 This is a disassembled diagram of the internal structure of the drawer unit of Example 3 of the present invention.

[0038] In the figure: 100-cabinet, 110-fan-shaped socket, 111-conductive slot, 111a-main circuit conductive slot, 111b-secondary circuit conductive slot, 112-purge hole, 112a-main circuit purge hole, 112b-secondary circuit purge hole, 113-built-in conductor, 120-cylindrical slot, 130-straight slot, 140-state switching slot, 141-first inclined plane, 142-second inclined plane, 143-card slot, 150-push rod, 200-drawer unit Element, 210-state switching hand wheel, 220-middle rod, 221-bump, 222-threading port, 223-pushing structure, 230-fan-shaped plug-in, 230a-main circuit plug-in, 230b-secondary circuit plug-in, 231-arc conductor, 240-first spring, 250-second spring, 310-one-way air outlet pipe, 320-air chamber, 321-air chamber outlet, 330-piston, 340-one-way air intake filter, 350-elastic component. DETAILED DESCRIPTION

[0039] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] In the description of this embodiment, it should also be noted that, unless otherwise clearly specified and limited, the terms “set”, “connected” and “connected” should be understood in a broad sense.

[0041] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0042] Embodiment 1

[0043] Reference Figures 1 to 16 The present embodiment discloses a pull-out switch cabinet, including a cabinet body and a drawer unit. The cabinet body is provided with a plurality of mounting slots, each of which can be provided with a drawer unit, and the drawer unit is provided with a state switching hand wheel. An intermediate rod is installed on the drawer unit, and the intermediate rod horizontally passes through the entire drawer unit front and back. The intermediate rod can rotate along the axis and can move forward and backward along the axis. A state switching hand wheel is installed at the front end of the intermediate rod, and a fan-shaped plug-in is provided at the rear. A fan-shaped socket is provided in the mounting slot, and the fan-shaped plug-in and the fan-shaped socket are coaxial with the intermediate rod. An arc-shaped conductor is provided on the fan-shaped plug-in, and a conductive slot is provided on the fan-shaped socket. By rotating the intermediate rod, the arc-shaped conductor can be inserted into or pulled out of the conductive slot. A built-in conductor is provided in the conductive slot. When the fan-shaped plug-in rotates, the arc-shaped conductor and the built-in conductor do not contact each other. When the arc-shaped conductor is inserted into the innermost end of the conductive slot, the intermediate rod is moved through the axis, and the arc-shaped conductor moves along and approaches the built-in conductor, and then contacts the built-in conductor.

[0044] This embodiment sets an intermediate rod that can rotate and move forward and backward along the axis, and controls the movement of the intermediate rod by operating the state switching hand wheel. During the process of plugging and unplugging the fan-shaped plug-in, the arc-shaped conductor does not contact the built-in conductor. When the arc-shaped conductor is inserted into the innermost end of the conductive slot, the intermediate rod is moved by the axis, and the arc-shaped conductor follows and moves close to the built-in conductor, and then contacts the built-in conductor, thereby avoiding frequent relative displacement between the arc-shaped conductor and the built-in conductor caused by frequent plugging and unplugging operations, greatly reducing the wear of the contact surface of the conductor, reducing maintenance costs, and improving the stability of the power system.

[0045] As a further solution of this embodiment: the fan-shaped plug-in includes a main circuit plug-in and a secondary circuit plug-in, and the fan-shaped socket is respectively provided with a main circuit conductive groove and a secondary circuit conductive groove. The secondary circuit plug-in is closer to the fan-shaped socket than the main circuit plug-in, so that the electrical connection with the fan-shaped socket is completed earlier when plugged in. The secondary circuit plug-in can rotate around the axis of the middle rod, and a first spring is provided between the secondary circuit plug-in and the middle rod. The first spring causes the secondary circuit plug-in to be located at an angular position closer to the fan-shaped socket, and by squeezing the first spring, the secondary circuit plug-in can be rotated to the same angular position as the main circuit plug-in. With the above technical solution, only the secondary circuit can be connected for debugging, or the main circuit and the secondary circuit can be connected at the same time.

[0046] As a further solution of this embodiment: the built-in conductor is elastic. A second spring is arranged between the middle rod and the main body of the drawer unit, and the second spring tends to push the middle rod to one side along the axial direction, and the side is set as the reset side, and the opposite side is the resetting side. A convex block is arranged on the side of the rear end of the middle rod, and a cylindrical groove is provided on the inner end face of the installation groove. When the drawer unit is installed in place in the installation groove, the rear end of the middle rod is located in the cylindrical groove and the two are coaxial. A straight groove is provided on the inner side wall of the cylindrical groove to cooperate with the convex block, and the straight groove is parallel to the axis. The rear end of the straight groove is connected to the state switching groove. The state switching groove extends along the circumferential direction, and the extension direction is the same as the rotation direction when the fan-shaped plug-in is plugged in, and a first inclined surface, a second inclined surface, and a clamping groove are arranged in sequence along the extension direction. The first inclined surface is inclined toward the resetting side, and the entire second inclined surface has a drop relative to the end point of the first inclined surface toward the reset side. The second inclined surface is also inclined toward the resetting side, and the clamping groove has a drop relative to the end point of the second inclined surface toward the reset side. When the projection is located at the starting point of the first inclined surface, the fan-shaped plug-in and the fan-shaped socket are not plugged in; when the projection moves inward along the first inclined surface, the secondary circuit plug-in is gradually inserted into the secondary circuit conductive groove, and the arc-shaped conductor of the secondary circuit plug-in does not contact the built-in conductor of the secondary circuit conductive groove; when the projection is located on the second inclined surface, the intermediate rod drives the fan-shaped plug-in to move toward the reset side, so that the arc-shaped conductor of the secondary circuit plug-in approaches the built-in conductor of the secondary circuit conductive groove and contacts; when the projection moves inward along the second inclined surface, the main circuit plug-in is gradually inserted into the main circuit conductive groove, and the arc-shaped conductor of the main circuit plug-in does not contact the built-in conductor of the main circuit conductive groove; when the projection is located in the card slot, the intermediate rod drives the fan-shaped plug-in to move toward the reset side, so that the arc-shaped conductor of the main circuit plug-in approaches the built-in conductor of the main circuit conductive groove and contacts. Through the above technical solution, by using the cooperation of the state switching groove and the projection, the state switching hand wheel can be turned to switch different connection states, and when disconnecting the circuit, it is necessary to press the state switching hand wheel inward while rotating it to prevent the circuit from being cut off by mistake. The above process is coordinated with the cooperation of the main circuit plug-in, the secondary circuit plug-in, the main circuit conductive groove and the secondary circuit conductive groove, which can easily complete the switching of the connection state while avoiding the friction between the arc conductor and the built-in conductor.

[0047] As a further solution of this embodiment: a threading hole is opened on the side of the middle rod, and the wires of the components in the drawer unit can pass through the threading hole to establish an electrical connection with the fan-shaped plug-in.

[0048] Embodiment 2

[0049] This embodiment, based on the first embodiment, further includes a purge component. Figures 4 to 14The purge assembly includes a one-way air outlet pipe and a matching air chamber and a piston. The piston is in sealed sliding contact with the inner wall of the air chamber, and the movement of the piston changes the effective volume in the air chamber. The inlet end of the one-way air outlet pipe is connected to the air chamber. When the drawer unit is installed in place in the installation groove, the outlet end of the one-way air outlet pipe faces the purge hole opened on the fan-shaped socket, and the purge hole is connected to the inner end of each conductive groove.

[0050] Furthermore, the purge assembly also includes a one-way air intake filter, which allows external air to enter the air chamber after being filtered.

[0051] Furthermore, a push rod is fixed in the installation groove, and when the drawer unit is installed in the installation groove from outside to inside, the push rod pushes the piston to move, so that the effective volume of the air chamber is reduced. An elastic component is arranged between the air chamber and the piston, and the elastic component tends to cause the piston to move in the direction of increasing the effective volume of the air chamber.

[0052] This embodiment provides a purge assembly, utilizes the installation action of the drawer unit, pushes the piston to squeeze the air chamber, blows the clean air in the air chamber into the purge hole, and thus purges each conductive slot, and cleans the impurities such as floating dust and solid particles that may exist in the conductive slot, avoids impurities from wearing the conductor, better protects the arc-shaped conductor and the built-in conductor, and can enhance the stability of the electrical connection. At the same time, the action of the push rod pushing the piston to squeeze the spring and air can produce a damping effect before the drawer unit is installed in place, preventing the equipment from being damaged by violent installation, and making it more advanced.

[0053] Embodiment 3

[0054] This embodiment is also provided with a purge assembly based on the first embodiment. Figures 17 to 19 The difference between this embodiment and the second embodiment is that the air chamber is arc-shaped, a pushing structure is fixed on the middle rod, and when the middle rod is rotated to a specific angle, the pushing structure can push the piston to slide in the air chamber. Of course, generally speaking, this embodiment should also be provided with a corresponding structure to realize the return stroke of the piston, a spring can be provided, or the reversal of the middle rod when the circuit is disconnected can be used to drive the return stroke of the piston, and those skilled in the art can design it arbitrarily.

[0055] Furthermore, there are two sets of purge assemblies. There are two purge holes, including a main circuit purge hole connected to each main circuit conductive slot, and a secondary circuit purge hole connected to each secondary circuit conductive slot. The outlets of the one-way air outlet pipes of the two sets of purge assemblies are aligned with the main circuit purge holes and the secondary circuit purge holes, respectively. When the main circuit plug-in is plugged in, the corresponding purge assembly purges the main circuit conductive slot; when the secondary circuit plug-in is plugged in, the corresponding purge assembly purges the secondary circuit conductive slot. Specifically, in this embodiment, two groups of air chambers are opened in the same annular foundation, and two air chamber outlets are respectively opened on the annular foundation for connecting the one-way air outlet pipe. The specific pipe layout scheme of the one-way air outlet pipe can be flexibly designed by those skilled in the art according to the specific layout in the drawer unit, which is not specifically shown in this embodiment.

[0056] This embodiment utilizes the action of rotating the state switching hand wheel when the circuit is connected to trigger the purge action, and further provides two sets of purge components. The purge action of each set of purge components is performed simultaneously with the plugging action of the corresponding plug-in and conductive slot. In this way, the air can only be discharged through the gap between the arc conductor and the conductive slot, thereby reducing the flow area and increasing the air flow rate, thereby enhancing the purge effect. In addition, the arc conductor can also be purged while purging the conductive slot.

[0057] The solution structure of the second embodiment is relatively simple and can produce a damping effect, while the solution structure of the third embodiment is relatively complex, but can enhance the purging effect, and can purge the arc conductor while purging the conductive slot. Those skilled in the art can make a reasonable choice according to needs.

[0058] The above only describes in detail the preferred embodiments of the present invention, which is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pull-out switch cabinet, comprising a cabinet body (100) and a drawer unit (200), wherein the cabinet body (100) is provided with a plurality of mounting slots, each of which can be provided with a drawer unit (200), and a state switching hand wheel (210) is provided on the drawer unit (200), characterized in that: The drawer unit (200) is provided with an intermediate rod (220), the intermediate rod (220) horizontally passes through the entire drawer unit (200) from front to back, and the intermediate rod (220) can rotate along the axis and can move forward and backward along the axial direction; a state switching hand wheel (210) is installed at the front end of the intermediate rod (220), and a fan-shaped plug-in (230) is arranged at the rear; a fan-shaped socket (110) is arranged in the installation groove, and the fan-shaped plug-in (230) and the fan-shaped socket (110) are both coaxial with the intermediate rod (220); an arc-shaped conductor (231) is arranged on the fan-shaped plug-in (230), and the fan-shaped socket (110) is arranged on the fan-shaped plug-in (230). 0) is provided with a conductive slot (111), and the arc-shaped conductor (231) can be inserted into or pulled out of the conductive slot (111) by rotating the middle rod (220); a built-in conductor (113) is provided in the conductive slot (111), and when the fan-shaped plug-in (230) rotates, the arc-shaped conductor (231) and the built-in conductor (113) are not in contact, and when the arc-shaped conductor (231) is inserted into the innermost end of the conductive slot (111), the middle rod (220) is moved by the axis, and the arc-shaped conductor moves along and approaches the built-in conductor (113), and then contacts the built-in conductor (113).

2. The pull-out switch cabinet according to claim 1, characterized in that: The fan-shaped plug-in (230) comprises a main circuit plug-in (230a) and a secondary circuit plug-in (230b), and the fan-shaped socket (110) is respectively provided with a main circuit conductive groove (111a) and a secondary circuit conductive groove (111b); the secondary circuit plug-in (230b) is closer to the fan-shaped socket (110) than the main circuit plug-in (230a), so that the electrical connection with the fan-shaped socket (110) is completed earlier when plugged in; the secondary circuit plug-in (230b) can rotate around the axis of the intermediate rod (220), and a first spring (240) is provided between the secondary circuit plug-in (230b) and the intermediate rod (220); the first spring (240) causes the secondary circuit plug-in (230b) to be located at an angle position closer to the fan-shaped socket (110), and by pressing the first spring (240), the secondary circuit plug-in (230b) can rotate to the same angle position as the main circuit plug-in (230a).

3. The pull-out switch cabinet according to claim 2, characterized in that: The built-in conductor (113) is elastic; a second spring (250) is arranged between the intermediate rod (220) and the main body of the drawer unit (200), and the second spring (250) tends to push the intermediate rod (220) to one side along the axial direction, and the side is set as the reset side, and the opposite side is the resetting side; a convex block (221) is arranged on the side surface of the rear end of the intermediate rod (220), and a cylindrical groove (120) is provided on the inner end surface of the installation groove; when the drawer unit (200) is installed in place in the installation groove, the rear end of the intermediate rod (220) is located in the cylindrical groove (120) and the two are coaxial; a straight groove (130) matching with the convex block (221) is provided on the inner side wall of the cylindrical groove (120), The straight groove (130) is parallel to the axis; the rear end of the straight groove (130) is connected to the state switching groove (140); the state switching groove (140) extends in the circumferential direction, the extension direction is the same as the rotation direction of the fan-shaped plug (230) when plugged, and a first inclined surface (141), a second inclined surface (142), and a clamping groove (143) are sequentially arranged along the extension direction; the first inclined surface (141) is inclined toward the resetting side, and the entire second inclined surface (142) has a drop relative to the end point of the first inclined surface (141) toward the reset side, and the second inclined surface (142) is also inclined toward the resetting side, and the clamping groove (143) has a drop relative to the end point of the second inclined surface (142) toward the reset side; when the protrusion ( When the protrusion (221) is located at the starting point of the first inclined surface (141), the fan-shaped plug-in (230) and the fan-shaped socket (110) are not plugged in; when the protrusion (221) moves inward along the first inclined surface (141), the secondary circuit plug-in (230b) is gradually inserted into the secondary circuit conductive groove (111b), and the arc-shaped conductor of the secondary circuit plug-in (230b) does not contact the built-in conductor (113) of the secondary circuit conductive groove (111b); when the protrusion (221) is located on the second inclined surface (142), the intermediate rod (220) drives the fan-shaped plug-in (230) to move toward the reset side, so that the arc-shaped conductor of the secondary circuit plug-in (230b) is close to the secondary circuit conductive groove (111b). The main circuit plug-in (230a) is inserted into the main circuit conductive slot (111a) and contacts the built-in conductor (113) of the main circuit conductive slot (111b); when the protrusion (221) moves inward along the second inclined surface (142), the main circuit plug-in (230a) is gradually inserted into the main circuit conductive slot (111a), and the arc-shaped conductor of the main circuit plug-in (230a) does not contact the built-in conductor (113) of the main circuit conductive slot (111a); when the protrusion (221) is located in the card slot (143), the intermediate rod (220) drives the sector-shaped plug-in (230) to move toward the reset side, so that the arc-shaped conductor of the main circuit plug-in (230a) approaches the built-in conductor (113) of the main circuit conductive slot (111a) and contacts.

4. The pull-out switch cabinet according to claim 1, characterized in that: A wire threading opening (222) is provided on the side of the middle rod (220), and the wires of the components in the drawer unit (200) can pass through the wire threading opening (222) to establish an electrical connection with the fan-shaped plug-in unit (230).

5. The pull-out switch cabinet according to claim 2, characterized in that: The device also includes a purge assembly; the purge assembly includes a one-way air outlet pipe (310) and an air chamber (320) and a piston (330) that cooperate with each other, the piston (330) being in sealing sliding contact with the inner wall of the air chamber (320), and the movement of the piston (330) changing the effective volume in the air chamber (320); the inlet end of the one-way air outlet pipe (310) is connected to the air chamber (320), and when the drawer unit (200) is installed in place in the installation groove, the outlet end of the one-way air outlet pipe (310) faces the purge hole (112) provided on the fan-shaped socket (110), and the purge hole (112) is connected to the inner end of each conductive groove (111).

6. The pull-out switch cabinet according to claim 5, characterized in that: The purge assembly further includes a one-way air inlet filter (340), which allows external air to enter the air chamber (320) after being filtered.

7. The pull-out switch cabinet according to claim 5, characterized in that: A push rod (150) is fixed in the installation groove. When the drawer unit (200) is installed in the installation groove from the outside to the inside, the push rod (150) pushes the piston (330) to move, so that the effective volume of the air chamber (320) is reduced. An elastic component (350) is arranged between the air chamber (320) and the piston (330). The elastic component (350) tends to urge the piston (330) to move in a direction that increases the effective volume of the air chamber (320).

8. The pull-out switch cabinet according to claim 5, characterized in that: The air chamber (320) is arc-shaped, and a pushing structure (223) is fixed on the middle rod (220). When the middle rod (220) is rotated to a specific angle, the pushing structure (223) can push the piston (330) to slide in the air chamber (320).

9. The pull-out switch cabinet according to claim 8, characterized in that: There are two sets of purge assemblies; there are two purge holes (112), including a main circuit purge hole (112a) connected to each main circuit conductive slot (111a), and a secondary circuit purge hole (112b) connected to each secondary circuit conductive slot (111b); outlets of the one-way air outlet pipes (310) of the two sets of purge assemblies are respectively aligned with the main circuit purge hole (112a) and the secondary circuit purge hole (112b); when the main circuit plug-in (230a) is plugged in, the corresponding purge assembly purges the main circuit conductive slot (111a); when the secondary circuit plug-in (230b) is plugged in, the corresponding purge assembly purges the secondary circuit conductive slot (111b).

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