Service cart for circuit breakers

Abstract

The utility model proposes a service trolley for a circuit breaker, the service trolley for a circuit breaker comprises a frame, a first load-bearing arm and a second load-bearing arm, the first load-bearing arm is fixed on the frame, and the second load-bearing arm is used to cooperate with the first load-bearing arm to carry the circuit breaker; the service trolley also comprises: a slide bar, which is fixed on the frame and penetrates the second load-bearing arm; a screw rod, which is rotatably connected to the frame, and the rotation of the screw rod can drive the second load-bearing arm to move along the slide bar. By setting one of the two load-bearing arms as a movable load-bearing arm, the spacing between the two load-bearing arms can be adjusted according to actual needs, so that one service trolley can be suitable for circuit breakers of various widths, which greatly reduces the cost.

Description

Technical Field

[0001] The utility model relates to the field of switch cabinets, in particular to a service trolley for circuit breakers. Background Art

[0002] The switchgear is a very important component of the power system. It is responsible for controlling and protecting the power supply of the power system to ensure the stable operation and safety of the power system. In order to ensure the normal operation of the switchgear, maintenance and protection are required. The circuit breaker is an important component of the switchgear, so the reliability of the circuit breaker's performance needs to be guaranteed, that is, when the circuit breaker needs maintenance or fails, it needs to be maintained or repaired. The service trolley can pull the circuit breaker out of the switchgear and can carry the circuit breaker. The staff can maintain or repair the circuit breaker on the service trolley, or use the service trolley to place the circuit breaker on a pallet through a hydraulic lifting mechanism for maintenance or repair.

[0003] In the prior art, the service trolley includes a frame and two bearing arms, the two bearing arms are fixedly arranged on the frame and both bearing arms are provided with slide rails, and the circuit breaker can be placed on the service trolley along the slide rails. The frame is provided with rollers to facilitate the movement of the service trolley. Since the width of the circuit breaker is various to match the switch cabinets of different widths, multiple service trolleys are required, which will increase the cost. Utility Model Content

[0004] In view of this, the utility model proposes a service trolley for a circuit breaker, the service trolley for a circuit breaker comprising a frame, a first load-bearing arm and a second load-bearing arm, the first load-bearing arm being fixed to the frame, and the second load-bearing arm being used to cooperate with the first load-bearing arm to carry the circuit breaker; the service trolley further comprises:

[0005] A sliding rod, which is fixed on the frame and passes through the second bearing arm;

[0006] A screw rod is rotatably connected to the frame, and the rotation of the screw rod can drive the second bearing arm to move along the sliding rod.

[0007] By setting one of the two carrying arms as a movable carrying arm, the distance between the two carrying arms can be adjusted according to actual needs, so that one service trolley can be suitable for circuit breakers of various widths, which greatly reduces the cost.

[0008] According to the service cart as described above, optionally, a positioning mechanism is further included, and the positioning mechanism includes:

[0009] A cylindrical portion, which is fixed to the second carrying arm and sleeved on the sliding rod;

[0010] a receiving portion, which is in communication with the cylindrical portion and wherein the axis of the cylindrical portion is perpendicular to the axis of the receiving portion;

[0011] A locating pin, at least a portion of which is located in the accommodating portion, and a plurality of through holes are provided on the sliding rod. When the screw rod drives the second bearing arm to move, the locating pin can be inserted into the through hole and at least a portion of the locating pin is located in the accommodating portion.

[0012] The positioning mechanism is used to position the second carrying arm.

[0013] According to the service cart as described above, optionally, the positioning pin comprises:

[0014] A cylindrical body capable of moving into or out of the through hole;

[0015] A protrusion is fixed to the columnar body, and the protrusion is used to block at least a portion of the columnar body from entering the through hole.

[0016] Such a positioning pin has a simple structure and low cost.

[0017] According to the service trolley as described above, optionally, the columnar body and the protrusion are integrally formed, so that the manufacturing process of the positioning pin is relatively simple and the cost is relatively low.

[0018] According to the service cart as described above, optionally, the positioning mechanism further comprises at least one of the following components:

[0019] A handle connected to the positioning pin, wherein the handle can drive the positioning pin to move in the accommodation portion;

[0020] a spring, which is sleeved on the positioning pin and can apply a thrust to the positioning pin toward the slide bar;

[0021] A flat plate is located between the accommodating portion and the cylindrical portion, and both the accommodating portion and the cylindrical portion are fixed to the flat plate.

[0022] According to the service trolley as described above, optionally, the trolley frame includes a crossbeam, the extension direction of the crossbeam is the same as that of the slide bar, the second load-bearing arm has a recessed portion, and the crossbeam is disposed through the recessed portion. In this way, during the movement of the second load-bearing arm, not only the movement direction can be restricted by the slide bar, but also the second direction can be restricted by the crossbeam, so that the second load-bearing arm is relatively stable during the movement.

[0023] According to the service trolley as described above, optionally, the number of the sliding bars is 2. The two sliding bars can better limit the second carrying arm.

[0024] According to the service trolley as described above, optionally, the first load-bearing arm and the second load-bearing arm both include a first slide rail, and the service trolley further includes a fixing assembly respectively fixed to the first load-bearing arm and the second load-bearing arm, each fixing assembly including:

[0025] An extension plate, which is fixed on the corresponding carrying arm, and the extension plate is located on the extension track of the first slide rail and is adjacent to the first slide rail;

[0026] The locking member is rotatably connected to the extension plate, and the locking member can rotate between a locking position and an unlocking position. When the locking member is in the locking position, the relative position between the switch cabinet and the service trolley is fixed, and when the locking member is in the unlocking position, the service trolley is separated from the switch cabinet. The existence of the locking member fixes the relative position between the service trolley and the switch cabinet, thus avoiding the position change of the service trolley during the movement of the circuit breaker, which causes inconvenience.

[0027] According to the service trolley as described above, optionally, the extension plate has a first notch and a second notch, the locking member has an integrally formed first arm, a rod-shaped portion, and a second arm, the first arm and the second arm are both vertically connected to the rod-shaped portion, the rod-shaped portion is rotatably placed in the extension plate, the first arm can rotate in the first notch, the second arm can rotate in the second notch, and the second arm can be inserted into the slot of the switch cabinet. Such a structure is very simple and easy to process.

[0028] According to the service trolley as described above, optionally, the second arm is longer than the first arm, so that it is convenient for the first arm to drive the second arm to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that those skilled in the art will be more aware of the above and other features and advantages of the present invention. In the accompanying drawings:

[0030] Figure 1 The figure is a schematic structural diagram of a service cart according to an embodiment of the utility model.

[0031] Figure 2 for Figure 1 Schematic diagram of the partial structure of the service cart.

[0032] Figure 3 It is a partial structural diagram of the positioning mechanism.

[0033] Figure 4 It is a schematic structural diagram of the second carrying arm.

[0034] Figure 5 A schematic diagram of the structure of the fixed component.

[0035] The reference numerals are as follows:

[0036] 1-Frame

[0037] 11-Fixed plate

[0038] 12-Beam

[0039] 13-Second slide rail

[0040] 21-First load-bearing arm

[0041] 22- Second load-bearing arm

[0042] 221-Depression

[0043] 23-First slide rail

[0044] 3- Slide bar

[0045] 31-Through hole

[0046] 4-Screw

[0047] 41-The head at one end of the screw

[0048] 51-Tubular part

[0049] 52-Accommodation

[0050] 53-Location pin

[0051] 531-Cylinder

[0052] 532-Prominence

[0053] 54-Handle

[0054] 55-Spring

[0055] 56-Tablet

[0056] 561-Bolt

[0057] 61-Extension plate

[0058] 611-First Gap

[0059] 612-Second Gap

[0060] 613-Guide

[0061] 62-Locking piece

[0062] 621-First Arm

[0063] 622-Rod

[0064] 623-Second Arm

[0065] 63-Baffle

[0066] 7-Drive

[0067] 8-Middle plate

[0068] 9-Handle DETAILED DESCRIPTION

[0069] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail with reference to the following embodiments. The nouns and pronouns related to people in this patent application are not limited to specific genders.

[0070] The utility model provides a service trolley for a circuit breaker. The service trolley can be suitable for circuit breakers of different widths.

[0071] The service trolley includes a frame 1 and two bearing arms, which are arranged opposite to each other and cooperate with each other to carry the circuit breaker. For ease of description, the two bearing arms are respectively referred to as the first bearing arm 21 and the second bearing arm 22, wherein the first bearing arm 21 is fixed to the frame 1.

[0072] like Figures 1 to 3 As shown, the service trolley for the circuit breaker further includes a slide rod 3 and a lead screw 4 .

[0073] The slide bar 3 is fixed on the frame 1 and passes through the second carrying arm 22. As an example, Figure 1 As shown, the extension direction of the slide bar 3 is the first direction D1, and the first direction D1 has two arrows indicating that any direction is acceptable. One end of the slide bar 3 is fixed to the first load-bearing arm 21, and the other end is fixed to the frame 1. More specifically, the frame 1 has a fixing plate 11, and the other end of the slide bar 3 is fixed to the fixing plate 11. The fixing plate 11 is arranged opposite to the first load-bearing arm 21 and is parallel to the first load-bearing arm 21. The second load-bearing arm 22 can slide along the slide bar 3, that is, the slide bar 3 limits the movement of the second load-bearing arm 22 in the first direction D1, so that the first load-bearing arm 21 and the second load-bearing arm 22 always maintain a relative arrangement, thereby being able to better carry the circuit breaker. Optionally, as Figure 1 and Figure 2 As shown, the number of the slide bars 3 is two, and the two slide bars 3 can better limit the second carrying arm 22 .

[0074] The screw rod 4 is rotatably connected to the frame 1, and the rotation of the screw rod 4 can drive the second bearing arm 22 to move along the slide rod 3. Figure 1 and Figure 2As shown, the screw rod 4 is rotatably connected to the fixed plate 11, and the other end is rotatably connected to the middle plate 8, and the middle plate 8 can be fixed between the two slide bars 3. Specifically, a tool can be used to cover the head 41 at one end of the screw rod 4, and the screw rod 4 can be rotated by rotating the head 41. The rotation of the screw rod 4 can drive the second bearing arm 22 to move along the first direction D1, so as to adjust the distance between the second bearing arm 22 and the first bearing arm 21, thereby adapting to circuit breakers of different widths.

[0075] Optionally, the frame 1 is also provided with a pulley to facilitate the movement of the service trolley. Figure 1 As shown, the rollers are provided in two groups, each group having two rollers, one group of which is a large roller 14, and the other group of which is a small roller 15. Each group of rollers adopts a small roller 15, which can save costs. These rollers can all be universal wheels.

[0076] In the utility model, by setting one of the two bearing arms as a movable bearing arm, the distance between the two bearing arms can be adjusted according to actual needs, thereby enabling one service trolley to be suitable for circuit breakers of various widths, which greatly reduces the cost.

[0077] Optionally, the service cart for circuit breaker of the utility model further comprises a positioning mechanism, which is used to position the second carrying arm 22. As an exemplary illustration, Figures 1 to 3 As shown, the positioning mechanism includes a cylindrical portion 51, a receiving portion 52 and a positioning pin 53. Accordingly, the slide bar 3 is provided with a plurality of through holes 31 to cooperate with the positioning mechanism to position the second carrying arm 22.

[0078] Among them, the cylindrical portion 51 is fixed to the second bearing arm 22 and the cylindrical portion 51 is sleeved on the slide rod 3. The cylindrical portion 51 can further limit the moving direction of the second bearing arm 22 to the extension direction of the slide rod 3, that is, the first direction D1, so that the stability of the second bearing arm 22 sliding in the first direction D1 can be ensured, and the existence of the cylindrical portion 51 can also set a positioning mechanism with a simple structure and low cost. The accommodating portion 52 is connected to the cylindrical portion 51 and the axis of the cylindrical portion 51 is perpendicular to the axis of the accommodating portion 52, and at least a part of the locating pin 53 is located in the accommodating portion 52. In the process of the screw rod 4 driving the second bearing arm 22 to move, the locating pin 53 can be inserted into the through hole 31 and at least a part of the locating pin 53 is located in the accommodating portion 52, so that the second bearing arm 22 can be positioned. From Figure 2 and Figure 3It can be seen that the extension direction of the locating pin 53 is parallel to the axis of the accommodating portion 52, that is, perpendicular to the axis of the cylindrical portion 51. The cylindrical portion 51 and the accommodating portion 52 are arranged vertically, and the structure is similar to a three-way valve. In the case where part of the locating pin 53 falls into the through hole 31, since part 53 is still located in the accommodating portion 52, the cylindrical portion 51 and the accommodating portion 52 are blocked by the locating pin 53 as a whole and cannot move, because the cylindrical portion 51 is. More specifically, the gap between the locating pin 53 and the accommodating portion 52 can be smaller, so that the blocking of the locating pin 53 can be achieved as soon as possible. The position of the through hole 31 can be set in advance so that the second bearing arm 22 and the first bearing arm 21 after being positioned can just adapt to a circuit breaker of one width. In this way, multiple through holes 31 make the service cart suitable for circuit breakers of multiple widths.

[0079] As an example, Figure 3 As shown, the positioning pin 53 includes a cylindrical body 531 and a protrusion 532, wherein the cylindrical body 531 can move into or out of the through hole 31, and the cylindrical body 531 can be a cylindrical body 531, and the diameter of the cylindrical body 531 is smaller than the diameter of the through hole 31. The protrusion 532 is fixed to the cylindrical body 531, and the protrusion 532 is used to block at least a part of the cylindrical body 531 from entering the through hole 31. The protrusion 532 can be a ring body, which can be integrally formed with the cylindrical body 531, and the outer diameter of the ring part is larger than the diameter of the through hole 31. Such a positioning pin 53 has a simple structure and low cost. Figure 2 and Figure 3 FIG. 5 is a schematic diagram showing that the positioning pin 53 is located in the through hole 31. Due to the function of the positioning pin 53, the second carrying arm 22 cannot move.

[0080] Alternatively, if Figure 3 As shown, the positioning mechanism also includes a flat plate 56, which is located between the receiving portion 52 and the cylindrical portion 51. The receiving portion 52 and the cylindrical portion 51 are both fixed to the flat plate 56. Since the surface of the cylindrical portion 51 is a curved surface, it is not convenient to fix it to other components. Therefore, the flat plate 56 is used for transition so that the receiving portion 52 and the cylindrical portion 51 can be better fixed together. The flat plate 56 can be fixed to the cylindrical portion 51 by bolts 561.

[0081] Optionally, the positioning mechanism further includes a handle 54, which is connected to the positioning pin 53 and can drive the positioning pin 53 to move in the accommodating portion 52, for example, along the second direction D2, and the second direction D2 is perpendicular to the first direction D1. For example, the second supporting arm 22 moves to one of the through holes 31 and snaps into the through hole 31, but the second supporting arm 22 has not moved to the designated through hole 31 at this time, then the handle 54 can be pinched and lifted upward to move the positioning pin 53 out of the current through hole 31, and the screw rod 4 can be continuously rotated to make the positioning pin 53 reach the designated through hole 31. The presence of the handle 54 facilitates the positioning pin 53 to move out of the through hole 31. Figure 3 As shown, the handle 54 is rotatably connected to the positioning pin 53, the top of the positioning pin 53 extends out of the receiving portion 52, the top of the receiving portion 52 has a first hole, and the positioning pin 53 extends out of the first hole. More specifically, the columnar body 531 includes a first part and a second part connected to each other, wherein the first part can pass through the first hole, and the second part cannot pass through the first hole, so that the positioning pin 53 can be limited.

[0082] Optionally, the positioning mechanism further includes a spring 55, which is sleeved on the positioning pin 53 and can apply a thrust to the positioning pin 53 toward the slide bar 3. The spring 55 is located in the accommodating portion 52, with its top abutting against the top of the accommodating portion 52 and its bottom abutting against the protruding portion 532. The thrust applied by the spring 55 can further ensure that the positioning pin 53 is inserted into the through hole 31 when passing through the through hole 31, thereby ensuring the overall performance of the service cart.

[0083] Optionally, the frame 1 includes a crossbeam 12, and the extension direction of the crossbeam 12 is consistent with the extension direction of the slide bar 3, that is, both are in the first direction D1. More specifically, the first bearing arm 21 is fixed to one side of the crossbeam 12, and the fixing plate 11 is fixed to the other side of the crossbeam 12. The second bearing arm 22 has a recessed portion 221, and the crossbeam 12 is located in the recessed portion 221. In this way, the second bearing arm 22 can not only be restricted in the direction of movement by the slide bar 3 during movement, but also can be restricted in the second direction D2 by the crossbeam 12, so that the second bearing arm 22 is more stable during movement. The second direction D2 is perpendicular to the first direction D1.

[0084] Optionally, the first carrying arm 21 and the second carrying arm 22 both include a first slide rail 23, and the service trolley further includes a fixing assembly respectively fixed to the first carrying arm 21 and the second carrying arm 22, such as Figure 4 and Figure 5As shown, the fixing assembly on the second load-bearing arm 22 is used as an example for explanation. Each fixing assembly includes an extension plate 61 and a locking member 62, wherein the extension plate 61 is fixed to the corresponding load-bearing arm, and the extension plate 61 is located on the extension track of the first slide rail 23 and is adjacent to the first slide rail 23; the locking member 62 is rotatably connected to the extension plate 61, and the locking member 62 can rotate between a locked position and an unlocked position. When the locking member 62 is in the locked position, the relative position between the switch cabinet and the service trolley is fixed. Figure 4 As can be seen in the figure, the extension plate 61 has a guide portion 613, which enables the extension plate 61 to be inserted into the bottom of the circuit breaker more conveniently.

[0085] The presence of the locking member 62 fixes the relative position between the service trolley and the switch cabinet, thus preventing the position of the service trolley from changing during the movement of the circuit breaker, thereby preventing inconvenience caused.

[0086] As an example, Figure 3 and Figure 4 As shown, the extension plate 61 has a first notch 611 and a second notch 612, and the locking member 62 has an integrally formed first arm 621, a rod-shaped portion 622 and a second arm 623, the first arm 621 and the second arm 623 are both vertically connected to the rod-shaped portion 622, the rod-shaped portion 622 is rotatably placed in the extension plate 61, the first arm 621 can rotate in the first notch 611, the second arm 623 can rotate in the second notch 612, and the second arm 623 can be inserted into the slot of the switch cabinet. Such a structure is very simple and easy to process. Optionally, the length of the first arm 621 is greater than that of the second arm 623, and the first arm 621 is in the shape of a handle, so that the first arm 621 can drive the second arm 623 to rotate. Figure 3 and Figure 4 Schematic diagram of the structure showing the lock key in a locked state.

[0087] Optionally, the fixing assembly further includes a baffle 63, which is fixedly connected to the extension plate 61 and is perpendicular to the extension plate 61. When the circuit breaker is moved to the service cart, it is likely to tilt, and the baffle 63 can play a good blocking role to prevent the circuit breaker from being damaged.

[0088] The working principle of the service trolley of the utility model is explained below by using specific examples.

[0089] When a circuit breaker in the switch cabinet fails, the staff first pushes the service trolley close to the circuit breaker by the handle 9. Then the staff steps on the driving device 7 to move the first bearing arm 21 and the second bearing arm 22 along the second slide rail 13 on the frame 1. The second slide rail 13 is arranged along the second direction D2, so as to adjust the height of the first bearing arm 21 and the second bearing arm 22 in the second direction D2. The driving device 7 here can specifically adopt a hydraulic lifting mechanism.

[0090] Next, the width of the circuit breaker is determined, and then it is known which through hole 31 the second bearing arm 22 needs to be set near, for example, the second through hole 31. The staff uses the handle 54 to rotate the screw rod 4 to drive the second bearing arm 22 to move. When passing through the first through hole 31, due to the action of the spring 55, the positioning pin 53 is inserted into the first through hole 31, but the first through hole 31 is not adapted to the width of the circuit breaker, so the staff can pinch the handle 54 and pull it upward, so that the positioning pin 53 moves out of the first through hole 31, and continue to rotate the screw rod 4, so that the second bearing arm 22 moves to the second through hole 31, and due to the action of the spring 55, the positioning pin 53 is inserted into the second through hole 31, and the second bearing arm 22 is positioned.

[0091] Next, the staff pushes the service cart to the circuit breaker of the switch cabinet, and pushes the service cart to insert the extension plate 61 into the bottom of the circuit breaker. Specifically, the first bearing arm 21 and the second bearing arm 22 can be smoothly inserted into the bottom of the circuit breaker through the guide portion 613. The shape of the guide portion 613 can be set according to actual needs. The staff rotates the first arm 621 of the fixing assembly on both sides respectively, so that the second arm 623 can be inserted into the slot of the switch cabinet. The slot can be any slot of the switch cabinet, and the second arm 623 can be inserted into it, so that the relative position between the service cart and the switch cabinet can be fixed.

[0092] Next, the staff pulls the circuit breaker onto the first slide rail 23 of the extension plate 61 , and then transitions to the first slide rail 23 on the carrying arm, so that the circuit breaker is completely placed on the service cart.

[0093] Then, the staff can push the service cart to a location where the circuit breaker can be inspected and repaired.

[0094] 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 in the protection scope of the present invention.

Claims

1. A service trolley for a circuit breaker, comprising a trolley frame (1), a first load-bearing arm (21) and a second load-bearing arm (22), wherein the first load-bearing arm (21) is fixed to the trolley frame (1), and the second load-bearing arm (22) is used to cooperate with the first load-bearing arm (21) to carry the circuit breaker; characterized in that: The service cart also includes: A slide bar (3) fixed on the frame (1) and passing through the second bearing arm (22); A screw rod (4) is rotatably connected to the vehicle frame (1), and the rotation of the screw rod (4) can drive the second bearing arm (22) to move along the sliding rod (3).

2. The service cart according to claim 1, characterized in that: Also included is a positioning mechanism, the positioning mechanism comprising: A cylindrical portion (51), which is fixed to the second carrying arm (22) and the cylindrical portion (51) is sleeved on the sliding rod (3); a receiving portion (52) which is in communication with the cylindrical portion (51) and the axis of the cylindrical portion (51) is perpendicular to the axis of the receiving portion (52); A positioning pin (53), at least a portion of which is located in the accommodating portion (52), and a plurality of through holes (31) are provided on the sliding rod (3). When the screw rod (4) drives the second bearing arm (22) to move, the positioning pin (53) can be inserted into the through hole (31) and at least a portion of the positioning pin (53) is located in the accommodating portion (52).

3. The service cart according to claim 2, characterized in that: The positioning pin (53) comprises: A cylindrical body (531) capable of moving into or out of the through hole (31); A protrusion (532) is fixed to the columnar body (531), and the protrusion (532) is used to block at least a portion of the columnar body (531) from entering the through hole (31).

4. The service cart according to claim 3, characterized in that: The columnar body (531) and the protruding portion (532) are integrally formed.

5. The service cart according to claim 2, characterized in that: The positioning mechanism further comprises at least one of the following components: a handle (54) connected to the positioning pin (53), wherein the handle (54) can drive the positioning pin (53) to move in the receiving portion (52); a spring (55), which is sleeved on the positioning pin (53) and can apply a thrust to the positioning pin (53) toward the slide bar (3); A flat plate (56) is located between the accommodating portion (52) and the cylindrical portion (51), and both the accommodating portion (52) and the cylindrical portion (51) are fixed to the flat plate (56).

6. The service cart according to claim 1, characterized in that: The vehicle frame (1) comprises a crossbeam (12), the extension direction of the crossbeam (12) being the same as that of the slide bar (3), the second bearing arm (22) having a recessed portion (221), and the crossbeam (12) passing through the recessed portion (221).

7. The service cart according to claim 1, characterized in that: The number of the sliding bars (3) is 2.

8. The service trolley according to any one of claims 1 to 7, wherein the first load-bearing arm (21) and the second load-bearing arm (22) both comprise a first slide rail (23), and the service trolley further comprises fixing components respectively fixed to the first load-bearing arm (21) and the second load-bearing arm (22), and each fixing component comprises: An extension plate (61) fixed on a corresponding bearing arm, wherein the extension plate (61) is located on an extension track of the first slide rail (23) and is adjacent to the first slide rail (23); A locking member (62) is rotatably connected to the extension plate (61). The locking member (62) can rotate between a locking position and an unlocking position. When the locking member (62) is in the locking position, the relative position between the switch cabinet and the service trolley is fixed. When the locking member (62) is in the unlocking position, the service trolley is detached from the switch cabinet.

9. The service cart according to claim 8, characterized in that: The extension plate (61) has a first notch (611) and a second notch (612); the locking member (62) has an integrally formed first arm (621), a rod-shaped portion (622) and a second arm (623); the first arm (621) and the second arm (623) are both vertically connected to the rod-shaped portion (622); the rod-shaped portion (622) is rotatably placed in the extension plate (61); the first arm (621) can rotate in the first notch (611); the second arm (623) can rotate in the second notch (612); and the second arm (623) can be inserted into a slot of a switch cabinet.

10. The service cart according to claim 9, characterized in that: The length of the first arm (621) is greater than that of the second arm (623).

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