A drawer-type low-voltage DC cabinet and a method of using the same

Abstract

The application relates to the technical field of direct current cabinets, and discloses a drawer type low-voltage direct current cabinet and a use method thereof, which comprises a cabinet body, a drawer box, a locking device and a connecting mechanism, the drawer box is slidably arranged on the cabinet body, the locking device is arranged on the drawer box, the connecting mechanism comprises a fixed terminal, a movable terminal, a connecting terminal and a limiting mechanism, the fixed terminal is fixedly arranged on the cabinet body, the movable terminal is fixedly arranged on the drawer box, the connecting terminal is slidably arranged on the fixed terminal, and the limiting mechanism is arranged between the movable terminal and the connecting terminal. The connecting mechanism is arranged to comprise the fixed terminal, the movable terminal, the connecting terminal and the limiting mechanism, the connecting state of the movable terminal and the connecting terminal is switched by the limiting mechanism, the connecting terminal can move along with the fixed terminal, the structural reliability of the electrical plug-in position is improved, and the use stability of the direct current cabinet is ensured.

Description

Technical Field

[0001] This invention relates to the field of DC cabinet technology, and in particular to a drawer-type low-voltage DC cabinet and its usage method. Background Technology

[0002] With the rapid development of new energy power generation, data centers, rail transit, and electric vehicle charging facilities, the demand for safe, compact, and easily maintainable low-voltage DC power distribution equipment is increasing. Drawer-type low-voltage DC cabinets are widely used due to their advantages such as ease of installation, maintenance, and module replacement.

[0003] Electrical connection reliability is a core issue for drawer-type low-voltage DC switchgear. To ensure long-term stable operation of the DC switchgear, existing drawer-type DC switchgear generally use rigid plug-in connections or simple spring contact methods for their connection mechanisms.

[0004] Manufacturing and assembly tolerances can cause initial loosening of the contact mechanism; thermal expansion and contraction during equipment operation can lead to a decrease in contact pressure; long-term insertion and removal wear and mechanical vibration can cause functional degradation of the connection mechanism. Existing rigid connection mechanisms cannot effectively address these problems, resulting in loosening or even failure of the connection mechanism, affecting the normal operation of the DC cabinet. Summary of the Invention

[0005] In view of this, the present invention proposes a drawer-type low-voltage DC cabinet and its usage method, which can dynamically and adaptively compensate for manufacturing errors, thermal deformation, mechanical wear and installation deviations, and ensure the stability and reliability of the connection mechanism.

[0006] The technical solution of this invention is implemented as follows: On one hand, this invention provides a drawer-type low-voltage DC cabinet, including a cabinet body, a pull-out box, a locking device, and a connecting mechanism. The pull-out box is slidably disposed on the cabinet body; the locking device is fixedly disposed on the pull-out box; the connecting mechanism includes a fixed terminal, a movable terminal, a connecting terminal, and a limiting mechanism. The fixed terminal is fixedly disposed on the cabinet body; the movable terminal is fixedly disposed on the pull-out box; the connecting terminal is slidably disposed on the fixed terminal; the limiting mechanism is disposed between the movable terminal and the connecting terminal. Before the connecting terminal is inserted into the fixed terminal, the connecting terminal is fixedly connected to the movable terminal via the limiting mechanism. When the connecting terminal is inserted into the fixed terminal, the locking device is fixedly connected to the cabinet body, and the connecting terminal is movably connected to the movable terminal via the limiting mechanism.

[0007] Based on the above technical solution, preferably, the limiting mechanism includes an intermediate block, two ball-head connecting rods, and a sliding sleeve. The intermediate block is disposed between the movable terminal and the connecting terminal. The two ball-head connecting rods are respectively rotatably disposed between the intermediate block and the movable terminal and between the intermediate block and the connecting terminal. The sliding sleeve is slidably disposed on the movable terminal and can be slidably connected with the intermediate block and the connecting terminal. When the sliding sleeve is simultaneously connected with the intermediate block, the movable terminal, and the connecting terminal, the axes of the two ball-head connecting rods are inclined to the axis of the sliding sleeve.

[0008] Based on the above technical solutions, preferably, the cabinet body is provided with a positioning hole; the limiting mechanism further includes a positioning rod, which is fixedly mounted on the sliding sleeve and slidably connected to the positioning hole.

[0009] Based on the above technical solutions, preferably, the limiting mechanism further includes a first spring, which is disposed between the pull-out box and the sliding sleeve.

[0010] Based on the above technical solutions, preferably, the limiting mechanism further includes a clamping tube, which is fixedly installed on the pull-out box. When the positioning rod slides into the clamping tube, the clamping tube is fixedly connected to the positioning rod.

[0011] Based on the above technical solutions, preferably, the cabinet includes a main frame, a mounting bracket, and a second spring. The pull-out box and the mounting bracket are both slidably mounted on the main frame, and the fixed terminal is fixedly mounted on the mounting bracket. The second spring is abutted between the mounting bracket and the main frame.

[0012] Based on the above technical solutions, preferably, the cabinet also includes a support frame, which is fixedly installed on the main frame and supports the positioning rod.

[0013] Based on the above technical solutions, preferably, the connecting mechanism further includes a protective ring, which is fixedly disposed on the periphery of the connecting terminal and abuts against the fixed terminal.

[0014] Based on the above technical solutions, preferably, the cabinet body is provided with a locking hole; the locking device includes a locking rod, a rotating rod and a connecting frame, the locking rod is slidably disposed on the pull-out box and slidably connected to the locking hole; the rotating rod is rotatably disposed on the pull-out box; the connecting frame is fixedly disposed on the rotating rod and rotatably connected to the locking rod.

[0015] Secondly, the present invention provides a method for using a drawer-type low-voltage DC cabinet, comprising the following steps: S1, installing circuit components inside the drawer and electrically connecting them to the movable terminal; S2, adjusting the limiting mechanism to fix the connecting terminal to the movable terminal; S3, sliding the drawer into the cabinet body to connect the connecting terminal to the fixed terminal; S4, operating the locking device to fix the drawer and the cabinet body; S5, adjusting the limiting mechanism to movably connect the connecting terminal to the movable terminal.

[0016] The drawer-type low-voltage DC cabinet and its usage method of the present invention have the following advantages over the prior art:

[0017] (1) By setting the connection mechanism to include fixed terminals, movable terminals, connecting terminals and limiting mechanisms, the connection state of the movable terminals and connecting terminals can be switched by the limiting mechanism, so that the connecting terminals can move with the fixed terminals, thereby improving the structural reliability of the electrical plug-in position and ensuring the stability of the DC cabinet.

[0018] (2) By setting an intermediate block, a ball-head connecting rod and a sliding sleeve in the limiting mechanism, and limiting the position of the ball-head connecting rod, the range of motion of the connecting terminal relative to the movable terminal can be expanded, and the adaptability of the connecting mechanism can be enhanced.

[0019] (3) By setting a positioning rod in the limiting mechanism, the installation accuracy of the pull-out box can be improved; by setting a mounting bracket and a second spring on the main frame, the positioning rod can be automatically inserted into the clamp tube by the movement of the pull-out box, thus improving the ease of operation of this DC cabinet. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a perspective view of a drawer-type low-voltage DC cabinet according to the present invention.

[0022] Figure 2 This is a perspective view of the pull-out box and locking device in a drawer-type low-voltage DC cabinet according to the present invention.

[0023] Figure 3 This is a perspective view of the pull-out box and connecting mechanism in a drawer-type low-voltage DC cabinet according to the present invention.

[0024] Figure 4This is a perspective view of the cabinet body in a drawer-type low-voltage DC cabinet according to the present invention.

[0025] Figure 5 This is a front view of the mounting bracket in a drawer-type low-voltage DC cabinet according to the present invention.

[0026] Figure 6 This is a top view of the pull-out box in a drawer-type low-voltage DC cabinet according to the present invention.

[0027] Figure 7 This is a perspective view of the limiting mechanism in a drawer-type low-voltage DC cabinet according to the present invention.

[0028] Figure 8 This is a cross-sectional view of the limiting mechanism in a drawer-type low-voltage DC cabinet according to the present invention, showing the state in which the movable terminal and the connecting terminal are fixedly connected.

[0029] Figure 9 This is a cross-sectional view of the limiting mechanism in a drawer-type low-voltage DC cabinet according to the present invention, showing the state in which the movable terminal and the connecting terminal are movably connected.

[0030] Figure 10 This is a cross-sectional view of the limiting mechanism in a drawer-type low-voltage DC cabinet according to the present invention, showing the state in which the connecting terminals are displaced.

[0031] Figure 11 This is a perspective view of the locking device in a drawer-type low-voltage DC cabinet according to the present invention.

[0032] Figure 12 This is a perspective view of the locking hole in a drawer-type low-voltage DC cabinet according to the present invention.

[0033] The components are as follows: 1. Cabinet; 11. Main frame; 12. Mounting bracket; 13. Second spring; 14. Support bracket; 101. Positioning hole; 102. Locking hole; 2. Pull-out box; 3. Locking device; 31. Locking rod; 32. Rotating rod; 33. Connecting bracket; 4. Connecting mechanism; 41. Fixed terminal; 42. Movable terminal; 43. Connecting terminal; 44. Limiting mechanism; 45. Protective ring; 441. Intermediate block; 442. Ball head connecting rod; 443. Sliding sleeve; 444. Positioning rod; 445. First spring; 446. Clamping tube. Detailed Implementation

[0034] The technical solutions of this invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0035] The present invention provides a drawer-type low-voltage DC cabinet, comprising a cabinet body 1, a pull-out box 2, a locking device 3, and a connecting mechanism 4.

[0036] The pull-out box 2 is slidably mounted on the cabinet 1. The pull-out box 2 contains circuit components. When the pull-out box 2 slides into the cabinet 1, the circuit components inside the pull-out box 2 are electrically connected to the electrical components on the cabinet 1 through the connecting mechanism 4, so as to realize the circuit conduction. When the pull-out box 2 slides out of the cabinet 1, the circuit components inside the pull-out box 2 are disconnected from the electrical components on the cabinet 1.

[0037] The locking device 3 is used to fix the pull-out box 2 to the cabinet 1. The locking device 3 is fixedly installed on the pull-out box 2. When the pull-out box 2 slides into the cabinet 1, the locking device 3 is used to fix the pull-out box 2 to the cabinet 1 together to prevent the pull-out box 2 from sliding accidentally.

[0038] In a preferred embodiment, the locking device 3 includes a locking rod 31, a rotating rod 32, and a connecting frame 33, such as... Figure 1 , Figure 2 , Figure 11 and Figure 12 As shown, the cabinet 1 is provided with a locking hole 102, the locking rod 31 is slidably mounted on the pull-out box 2 and is slidably engaged with the locking hole 102, the rotating rod 32 is rotatably mounted on the pull-out box 2 and is fixedly connected to the control end of the switch element inside the pull-out box 2, and the connecting frame 33 is fixedly mounted on the rotating rod 32 and is rotatably connected to the locking rod 31.

[0039] One end of the rotating rod 32 extends out of the pull-out box 2. When the rotating rod 32 is rotated, it can not only perform the closing operation of the switch element, but also drive the locking rod 31 to slide downward through the connecting frame 33, so that the lower end of the locking rod 31 is inserted into the locking hole 102, thereby realizing the fixed connection between the pull-out box 2 and the cabinet 1.

[0040] The equipment has manufacturing errors, and as the equipment is used over time, the components will wear down. Electrical components generate heat during use, causing them to expand and contract. All of these factors can lead to loosening or shaking of the connection mechanism 4 during use, affecting the normal operation of the DC cabinet.

[0041] Therefore, the connection mechanism 4 is configured to include a fixed terminal 41, a movable terminal 42, a connecting terminal 43, and a limiting mechanism 44. The fixed terminal 41 is fixedly mounted on the cabinet 1 and electrically connected to the electrical components on the cabinet 1; the movable terminal 42 is fixedly mounted on the pull-out box 2 and electrically connected to the circuit components inside the pull-out box 2; the connecting terminal 43 is slidably connected to the fixed terminal 41 to realize the connection and disconnection of the two.

[0042] A limiting mechanism 44 is positioned between the movable terminal 42 and the connecting terminal 43. Before the connecting terminal 43 is inserted into the fixed terminal 41, it is fixedly connected to the movable terminal 42 via the limiting mechanism 44, facilitating its insertion into the fixed terminal 41 along with the movable terminal 42 and the pull-out box 2. When the connecting terminal 43 is inserted into the fixed terminal 41, the locking device 3 is fixedly connected to the cabinet 1, and the connecting terminal 43 is movably connected to the movable terminal 42 via the limiting mechanism 44. Therefore, if the pull-out box 2 shakes or the fixed terminal 41 expands or contracts due to temperature changes, the connecting terminal 43 will not slide relative to the fixed terminal 41, ensuring the normal operation of the DC cabinet.

[0043] like Figure 8 As shown, the connecting mechanism 4 also includes a protective ring 45, which is fixedly disposed on the periphery of the connecting terminal 43 and abuts against the fixed terminal 41. On the one hand, the protective ring 45 can increase the conducting cross-sectional area of ​​the connecting mechanism 4 and reduce the internal resistance of the circuit; on the other hand, it can improve the insertion stability of the connecting terminal 43 and the fixed terminal 41.

[0044] In a preferred embodiment, the limiting mechanism 44 includes an intermediate block 441, two ball-head connecting rods 442, and a sliding sleeve 443. The intermediate block 441 is disposed between the movable terminal 42 and the connecting terminal 43. The two ball-head connecting rods 442 are respectively rotatably disposed between the intermediate block 441 and the movable terminal 42 and between the intermediate block 441 and the connecting terminal 43. The sliding sleeve 443 is slidably disposed on the movable terminal 42 and can be slidably connected with the intermediate block 441 and the connecting terminal 43.

[0045] The intermediate block 441, the movable terminal 42, and the connecting terminal 43 are all circular rod-shaped structures with the same outer diameter. For example... Figure 9 and Figure 10 As shown, the ball head connecting rod 442 has ball head structures at both ends so as to be rotatably connected with the intermediate block 441, the movable terminal 42 and the connecting terminal 43, thereby realizing the universal rotation connection between the connecting terminal 43 and the movable terminal 42, and thus enabling the connecting terminal 43 to move with the fixed terminal 41.

[0046] like Figure 8As shown, one end of the ball joint connecting rod 442 is connected to the upper part of the middle block 441, and the other end is connected to the lower part of the movable terminal 42 or the connecting terminal 43. When the sliding sleeve 443 is simultaneously connected to the middle block 441, the movable terminal 42, and the connecting terminal 43, the axes of both ball joint connecting rods 442 are inclined to the axis of the sliding sleeve 443. At this time, the periphery of the connecting terminal 43 is held by the sliding sleeve 443 and cannot be displaced relative to the middle block 441 and the sliding sleeve 443. Similarly, the movable terminal 42 cannot be displaced relative to the middle block 441 and the sliding sleeve 443, thereby achieving a fixed connection between the connecting terminal 43 and the movable terminal 42.

[0047] Therefore, before the connecting terminal 43 is inserted into the fixed terminal 41, the sliding sleeve 443 is moved so that it fits on the outside of the intermediate block 441, the movable terminal 42, and the connecting terminal 43, thus achieving a fixed connection between the connecting terminal 43 and the movable terminal 42. When the connecting terminal 43 is inserted into the fixed terminal 41, the sliding sleeve 443 is moved so that it separates from the intermediate block 441 and the connecting terminal 43, thus achieving a movable connection between the connecting terminal 43 and the movable terminal 42. This movable connection means that the connecting terminal 43 and the movable terminal 42 can undergo relative displacement, and they still maintain an electrical connection when they undergo relative displacement.

[0048] The limiting mechanism 44 also includes a positioning rod 444, such as Figure 9 As shown, the cabinet 1 is provided with a positioning hole 101, and the positioning rod 444 is fixedly mounted on the sliding sleeve 443 and slidably connected to the positioning hole 101. When the pull-out box 2 slides into the cabinet 1, the positioning rod 444 is first inserted into the positioning hole 101 to position the pull-out box 2, and then the connecting terminal 43 is inserted into the fixed terminal 41, thereby improving the assembly accuracy of the pull-out box 2 and the docking accuracy of the connecting mechanism 4. Preferably, the front end of the positioning hole 101 is tapered, and the inner diameter of the positioning hole 101 is slightly larger than the outer diameter of the positioning rod 444.

[0049] When the pull-out box 2 slides into the cabinet 1, the positioning rod 444 passes through the positioning hole 101 through the position where the fixed terminal 41 is installed on the cabinet 1. At this time, the sliding sleeve 443 can be moved by moving the positioning rod 444 to achieve the movable connection between the connecting terminal 43 and the movable terminal 42.

[0050] like Figures 7-9 As shown, the limiting mechanism 44 also includes a first spring 445, which is abutted between the pull-out box 2 and the sliding sleeve 443. When the pull-out box 2 is slidable, if the positioning rod 444 accidentally collides with the cabinet 1, the first spring 445 can buffer the positioning rod 444 to prevent it from bending.

[0051] like Figure 8As shown, the right end of the movable terminal 42 is provided with a rivet plate. When the sliding sleeve 443 moves to this position, the sliding sleeve 443 abuts against the rivet plate and cannot continue to slide to the right. In the natural state, the first spring 445 abuts against the sliding sleeve 443, so that the connecting terminal 43 and the movable terminal 42 can be kept in a fixed connection state in the natural state, thereby improving the ease of use of this device.

[0052] like Figure 8 and Figure 9 As shown, when the positioning rod 444 is slid to the left, the sliding sleeve 443 can be separated from the intermediate block 441 and the connecting terminal 43, thereby allowing the connecting terminal 43 to be movably connected to the movable terminal 42. To maintain this state, the limiting mechanism 44 is also provided with a clamping tube 446, which is fixedly installed on the pull-out box 2. When the positioning rod 444 slides into the clamping tube 446, the clamping tube 446 is fixedly connected to the positioning rod 444, thereby preventing the positioning rod 444 from rebounding.

[0053] Clamping tube 446 refers to a component with a clamping function. As a preferred embodiment, such as... Figure 8 and Figure 9 As shown, the inside of the clamp tube 446 is provided with serrated protrusions, and the right end of the clamp tube 446 is slotted. The circumference of the positioning rod 444 is provided with corresponding serrated grooves. When the positioning rod 444 is inserted into the right end of the clamp tube 446, the serrated groove on the positioning rod 444 engages with the protrusion inside the clamp tube 446, thereby achieving a fixed connection between the positioning rod 444 and the clamp tube 446.

[0054] like Figures 8-10 As shown, by setting an intermediate block 441, a ball-head connecting rod 442 and a sliding sleeve 443 in the connecting mechanism 4, and making the positions of the two ends of the ball-head connecting rod 442 different, not only can the connecting terminal 43 and the movable terminal 42 rotate relative to each other, but the connecting terminal 43 and the movable terminal 42 can also move towards each other, away from each other or radially while maintaining parallelism, so that the connecting mechanism 4 can adapt to different working conditions.

[0055] The method of using a drawer-type low-voltage DC cabinet according to the present invention is as follows:

[0056] S1, install the circuit components inside the pull-out box 2 and electrically connect them to the movable terminal 42.

[0057] S2, under the elastic force of the first spring 445, the sliding sleeve 443 slides between the movable terminal 42, the connecting terminal 43 and the intermediate block 441, so that the connecting terminal 43 is fixedly connected to the movable terminal 42.

[0058] S3, slide the pull-out box 2 into the cabinet 1, and slowly push the pull-out box 2 until the connecting terminal 43 is connected to the fixed terminal 41.

[0059] S4, rotate the rotating rod 32 to drive the locking rod 31 to slide into the locking hole 102, so as to realize the fixed connection between the pull-out box 2 and the cabinet 1.

[0060] S5, push the positioning rod 444 to insert the positioning rod 444 into the clamp tube 446 and fix the positioning rod 444 to the clamp tube 446, thereby separating the sliding sleeve 443 from the connecting terminal 43 and the intermediate block 441, so that the connecting terminal 43 and the movable terminal 42 form a movable connection, so as to avoid the problem of sliding between the connecting terminal 43 and the fixed terminal 41.

[0061] The pulling operation of the pull-out box 2 will cause the connecting terminal 43 to connect or separate from the fixed terminal 41. The setting of the limiting mechanism 44 keeps the relative position of the connecting terminal 43 and the fixed terminal 41 unchanged in the connected state, thereby helping to avoid squeezing damage between the connecting terminal 43 and the fixed terminal 41 and extending the insertion and removal life of the connecting terminal 43 and the fixed terminal 41.

[0062] In the above design, the connection state between the connecting terminal 43 and the movable terminal 42 is controlled by the positioning rod 444. The position of the positioning rod 444 is close to the position where electrical components are installed on the cabinet 1. If the positioning rod 444 is directly operated, there is a safety hazard. Therefore, the cabinet 1 has been improved.

[0063] like Figure 4 and Figure 5 As shown, the cabinet 1 includes a main frame 11, a mounting bracket 12, a second spring 13, and a support bracket 14. The pull-out box 2 and the mounting bracket 12 are both slidably mounted on the main frame 11, and the fixed terminal 41 is fixedly mounted on the mounting bracket 12. The second spring 13 is abutted between the mounting bracket 12 and the main frame 11, and the support bracket 14 is fixedly mounted on the main frame 11.

[0064] The mounting bracket 12 with the fixed terminal 41 is connected to the main frame 11 via the second spring 13. When the pull-out box 2 moves and the connecting terminal 43 is inserted into the fixed terminal 41, the second spring 13 can buffer the mounting bracket 12 and the fixed terminal 41, reducing the probability of impact damage to the fixed terminal 41.

[0065] More importantly, such as Figure 6As shown, when the pull-out box 2 slides into the main frame 11 and the connecting terminal 43 is inserted into the fixing terminal 41, the positioning rod 444 passes through the positioning hole 101 and abuts against the support frame 14. At this time, the locking device 3 is not operated, but the pull-out box 2 is pushed to the right. The pull-out box 2 continues to move to the right against the mounting frame 12. Since the support frame 14 is fixed on the main frame 11 and abuts against the positioning rod 444, the positioning rod 444 will not move. Instead, it is inserted into the clamping tube 446 that moves to the right, thus fixing the positioning rod 444 to the clamping tube 446. Finally, the pull-out box 2 is released, and the second spring 13 is used to reset the mounting frame 12 and the pull-out box 2. The locking device 3 is then operated to fix the pull-out box 2 to the cabinet 1.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A drawer-type low-voltage DC cabinet, comprising a cabinet body (1) and a pull-out box (2), characterized in that... It also includes a locking device (3) and a connecting mechanism (4), wherein, The pull-out box (2) is slidably mounted on the cabinet (1); The locking device (3) is fixedly installed on the pull-out box (2); The connecting mechanism (4) includes a fixed terminal (41), a movable terminal (42), a connecting terminal (43), and a limiting mechanism (44). The fixed terminal (41) is fixedly mounted on the cabinet (1); the movable terminal (42) is fixedly mounted on the pull-out box (2); the connecting terminal (43) is slidably mounted on the fixed terminal (41); the limiting mechanism (44) is located between the movable terminal (42) and the connecting terminal (43). Before the connecting terminal (43) is inserted into the fixed terminal (41), the connecting terminal (43) is fixedly connected to the movable terminal (42) through the limiting mechanism (44). When the connecting terminal (43) is inserted into the fixed terminal (41), the locking device (3) is fixedly connected to the cabinet (1), and the connecting terminal (43) is movably connected to the movable terminal (42) through the limiting mechanism (44).

2. The drawer-type low-voltage DC switchgear as described in claim 1, characterized in that: The limiting mechanism (44) includes an intermediate block (441), two ball-head connecting rods (442), and a sliding sleeve (443). The intermediate block (441) is disposed between the movable terminal (42) and the connecting terminal (43). The two ball-head connecting rods (442) are respectively rotatably disposed between the intermediate block (441) and the movable terminal (42) and between the intermediate block (441) and the connecting terminal (43). The sliding sleeve (443) is slidably disposed on the movable terminal (42) and can be slidably connected with the intermediate block (441) and the connecting terminal (43). When the sliding sleeve (443) is simultaneously connected with the intermediate block (441), the movable terminal (42), and the connecting terminal (43), the axes of the two ball-head connecting rods (442) are inclined to the axis of the sliding sleeve (443).

3. A drawer-type low-voltage DC switchgear as described in claim 2, characterized in that: The cabinet (1) is provided with positioning holes (101); The limiting mechanism (44) also includes a positioning rod (444), which is fixedly mounted on the sliding sleeve (443) and slidably connected to the positioning hole (101).

4. A drawer-type low-voltage DC switchgear as described in claim 3, characterized in that: The limiting mechanism (44) further includes a first spring (445), which is abutted between the pull-out box (2) and the sliding sleeve (443).

5. A drawer-type low-voltage DC switchgear as described in claim 4, characterized in that: The limiting mechanism (44) also includes a clamping tube (446), which is fixedly installed on the pull-out box (2). When the positioning rod (444) slides into the clamping tube (446), the clamping tube (446) is fixedly connected to the positioning rod (444).

6. A drawer-type low-voltage DC switchgear as described in claim 5, characterized in that: The cabinet (1) includes a main frame (11), a mounting bracket (12) and a second spring (13). The pull-out box (2) and the mounting bracket (12) are slidably disposed on the main frame (11), and the fixed terminal (41) is fixedly disposed on the mounting bracket (12). The second spring (13) is abutted between the mounting bracket (12) and the main frame (11).

7. A drawer-type low-voltage DC switchgear as described in claim 6, characterized in that: The cabinet (1) also includes a support frame (14), which is fixedly mounted on the main frame (11) and abuts against the positioning rod (444).

8. A drawer-type low-voltage DC switchgear as described in claim 1, characterized in that: The connecting mechanism (4) also includes a protective ring (45), which is fixedly disposed on the periphery of the connecting terminal (43) and abuts against the fixed terminal (41).

9. A drawer-type low-voltage DC switchgear as described in claim 1, characterized in that: The cabinet (1) is provided with a locking hole (102); The locking device (3) includes a locking rod (31), a rotating rod (32), and a connecting frame (33). The locking rod (31) is slidably disposed on the pull-out box (2) and slidably connected to the locking hole (102). The rotating rod (32) is rotatably disposed on the pull-out box (2). The connecting frame (33) is fixedly disposed on the rotating rod (32) and rotatably connected to the locking rod (31).

10. A method of using a drawer-type low-voltage DC switchgear as described in any one of claims 1-9, characterized in that, Includes the following steps: S1, install the circuit components inside the pull-out box (2) and electrically connect them to the movable terminal (42); S2, adjust the limiting mechanism (44) to fix the connecting terminal (43) to the movable terminal (42); S3, slide the pull-out box (2) into the cabinet (1) so that the connecting terminal (43) is connected to the fixed terminal (41); S4, operate the locking device (3) to fix the pull-out box (2) and the cabinet (1) in place; S5, adjust the limiting mechanism (44) to make the connecting terminal (43) and the movable terminal (42) movably connected.

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