Pushing mechanism for draw-out type switch cabinet

Abstract

The utility model discloses a propulsion mechanism for a draw-out type switch cabinet, which belongs to the technical field of draw-out type switch cabinets, and is characterized by comprising a transmission screw arranged on a drawer bottom plate through a bracket, a groove-shaped positioning piece arranged on a cabinet laminate, and a rocking handle, a driven gear which is coaxial with the rotating shaft and used for driving the transmission screw to rotate is arranged on the rotating shaft at the end, away from the cabinet body layer plate, of the transmission screw, an auxiliary gear meshed with the driven gear is rotationally arranged on the support, and a position indicating dial with three positions is arranged at the end, away from the transmission screw, of the auxiliary gear. The support is rotatably provided with a rotary positioning device which drives the driven gear to rotate in a meshed mode and is used for positioning three positions, the rotary positioning device is matched with the rocking handle, and the support is provided with a warning device used for warning the connection state of the three positions. And warning is carried out when the drawer is in the three states of the separation position state, the test position state and the connection position state, so that equipment damage caused by load loading due to virtual building of the drawer and the draw-out type switch cabinet is avoided, and the effects of simple operation and safe warning are achieved.

Description

Technical Field

[0001] This application relates to the field of withdrawable switchgear technology, and more specifically to a push mechanism for withdrawable switchgear. Background Technology

[0002] Low-voltage switchgear plays a crucial role in power distribution and control. Traditional drawer-type low-voltage switchgear is widely used in various industrial sites, commercial buildings, and residential communities, ensuring the stable operation of the power system. However, existing drawer-type low-voltage switchgear has some problems that urgently need to be addressed.

[0003] Currently, Chinese invention patent CN101217229A discloses a push mechanism for a drawer of a low-voltage pull-out switch cabinet, including a screw-in mechanism and a three-position locking mechanism. The screw-in mechanism pushes the drawer to move within the cabinet. After the drawer is pushed to each designated position in sequence, the three-position locking mechanism locks the screw-in mechanism, realizing three electrical connection states: separation, testing, and connection between the drawer and the cabinet. The screw-in mechanism includes a drive screw mounted on the drawer bottom plate via a bracket and a slotted positioning component mounted on the cabinet shelf that matches the drive screw and pushes the drawer to move back and forth. The spiral protrusion of the drive screw and the inclined groove of the slotted positioning component effectively control the linear movement of the drawer, ensuring that the drawer will not tilt due to force when subjected to a counterforce, thus preventing mechanical dead points.

[0004] The three-position locking mechanism is installed inside the bracket and includes a three-position positioning plate, an unlocking rod, and a transmission gear set that links the three-position positioning plate with the transmission screw. The unlocking rod has an unlocking groove, the three-position positioning plate has a positioning groove, and the unlocking rod has a return spring that resets the unlocking rod. When the drawer needs to be pushed in, the unlocking rod is moved so that the three-position positioning plate can be inserted into the unlocking groove of the unlocking rod, thus unlocking the three-position positioning plate. When the drawer is pushed to the designated position, the unlocking rod is reset under the action of the return spring and engages with the positioning groove of the three-position positioning plate, thus locking the three-position positioning plate.

[0005] Existing technologies with similar propulsion mechanisms are complex in structure. During use, operators need to press the unlocking lever with one hand and turn the crank handle with the other to unlock. When the unlocking groove of the unlocking lever is not aligned with the positioning groove, the three-position positioning plate cannot rotate. Each time the rotating sleeve is rotated, one hand must press the unlocking lever and the other hand must turn it, which is inconvenient to operate. Furthermore, the withdrawable switchgear does not have drawer position warning functions for the separated position, test position, and connected position. This can easily lead to the operator mistakenly believing that the drawer and the withdrawable switchgear are connected when the connector on the drawer and the connector on the withdrawable switchgear are in a loose state and the position indicator on the drawer shows a connected state. This can cause damage to the equipment when the operator powers on the equipment and applies a load.

[0006] In view of this, the inventors have designed a push mechanism for a pull-out switchgear that is easy to operate and has a warning function. Utility Model Content

[0007] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a push mechanism for a pull-out switchgear. Its advantages are that the operator can operate the push mechanism with one hand, and it provides warnings in three states: the drawer is in the separated position, the test position, and the connected position, respectively, to prevent damage to the equipment caused by the drawer being improperly loaded with a load on the pull-out switchgear. This achieves the effects of simple operation and safety warning.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a push mechanism for a pull-out switch cabinet, comprising a drive screw mounted on the bottom plate of the drawer via a bracket, a slotted positioning component mounted on the cabinet shelf, and a crank handle. A driven gear, coaxial with and used to drive the drive screw to rotate, is mounted on the shaft at the end of the drive screw away from the cabinet shelf. A secondary drive gear, meshing with the driven gear, is rotatably mounted on the bracket. A position indicator disc with three positions is mounted at the end of the secondary drive gear away from the drive screw. A rotary positioning device, meshing with and driving the driven gear to rotate, is rotatably mounted on the bracket for three-position positioning. The rotary positioning device cooperates with the crank handle. A warning device for indicating the three-position connection status is provided on the bracket.

[0009] By adopting the above technical solution, when the drawer is installed into the cabinet, a force is applied to the rotary positioning device by controlling the crank handle with one hand. This causes the rotary positioning device to drive the driven gear to rotate, which in turn drives the transmission screw to rotate and interact with the slotted positioning component, thereby moving the drawer into the cabinet. During the rotation of the driven gear, the auxiliary gear meshing with it also rotates, causing the position indicator dial, which rotates with the auxiliary gear, to move together. When the position indicator dial rotates to any specific indicated position, the rotary positioning device can perform a limit braking. When the internal components of the drawer are loosely connected to the internal components of the cabinet, the warning device does not activate, indicating that the drawer is in a separated position. When the position indicator dial is in the test position and the warning device issues a corresponding prompt, this indicates that the drawer is in the test position. When the position indicator dial is in the connected position and the warning device issues a corresponding prompt, this indicates that the drawer is in the connected position.

[0010] In summary, the aforementioned transmission screw, slotted positioning component, rocker handle, driven gear, auxiliary gear, position indicator, and rotary positioning device enable the operator to operate the propulsion mechanism with one hand. Furthermore, the relative indications from the position indicator and warning device allow the operator to determine whether the drawer is in a connected state. This allows for one-handed operation of the propulsion mechanism, with warnings issued for the drawer in three states: disengaged, test, and connected. This prevents damage to the equipment caused by improper load application between the drawer and the pull-out switch cabinet, achieving the goals of convenient operation and safety warnings.

[0011] The present invention is further configured as follows: the rotary positioning device includes a rotary support rod rotatably mounted on a bracket and moving along its extension direction; a driving gear coaxially mounted on the rotary support rod and meshing with a driven gear; a rotating sleeve coaxially mounted on the end of the rotary support rod away from the transmission screw and cooperating with a rocker handle; a force-applying spring sleeved on the rotary support rod and always applying a force to the rotary support rod away from the transmission screw direction; a limiting block disposed on the end of the rotary support rod away from the rotating sleeve; and a positioning block disposed on the end face of the driving gear facing the rotating sleeve. The bracket is provided with a limiting plate that fits against the end face of the driving gear facing the rotating sleeve. The limiting plate is provided with three positioning holes corresponding to three positions on the position indicator disk. The positioning block is engaged with any of the positioning holes. The axial extension length of the driving gear is greater than the axial extension length of the driven gear. During the movement of the driving gear along its length direction, the driving gear and the driven gear are always in a meshing state.

[0012] By adopting the above technical solution, when it is necessary to apply force to the driven gear through the rotary positioning device, the crank can be installed on the rotating sleeve first. Then, the crank applies a force to the rotating sleeve in the direction of the driving gear, causing the force spring sleeved on the rotating support rod to be further compressed and deformed. Then, the crank applies a rotational force to the rotating sleeve, causing the driving gear to drive the driven gear to rotate. After the driving gear rotates three degrees, the force applied by the rotating sleeve in the direction of the driving gear is removed. During the recovery process, the force spring applies a force to the driving gear in the direction of the limiting plate, causing the positioning hole to abut against the limiting plate. Then, the crank is rotated to drive the driving gear to rotate. When the positioning block rotates to any positioning hole, the positioning hole is engaged with the positioning hole due to the action of the force spring. At this time, the position indicator is stopped at the corresponding position state, and the positioning block is pressed against the bracket.

[0013] The present invention is further configured such that: both ends of the driving gear are provided with limiting flanges that interact with the end face of the driven gear.

[0014] By adopting the above technical solution, when the driving gear moves along the extension direction of its cross section, the limiting flange on the driving gear can stop moving when it moves to abut against the end face of the driven gear, effectively preventing the driving gear from disengaging from the driven gear.

[0015] The present invention is further configured such that: a limiting sleeve for mounting a rotating support rod is provided on the bracket.

[0016] By adopting the above technical solution, the setting of the limiting sleeve can effectively limit the rotation support rod.

[0017] The present invention is further configured such that: the warning device includes a main contact pin and a secondary contact pin disposed on the upper surface of the cabinet shelf; a main sliding contact conductive rail disposed on the bracket and located at the lower end of the drawer bottom plate and electrically connected to the main contact pin; a first secondary sliding contact conductive rail and a second secondary sliding contact conductive rail disposed on the bracket and located at the lower end of the drawer bottom plate and electrically connected to the secondary contact pin; a controller and a battery disposed on the upper surface of the drawer bottom plate; and a warning light disposed on the side of the bracket away from the transmission screw. The main sliding contact conductive rail, the first secondary sliding contact conductive rail, and the second secondary sliding contact conductive rail are arranged parallel to each other and their extension directions are all consistent with the moving direction of the drawer bottom plate. The second auxiliary sliding contact line is located at the end of the first auxiliary sliding contact line furthest from the position indicator, and the end faces of the first and second auxiliary sliding contact lines correspond directly to each other. The controller is electrically connected to the battery, the main sliding contact line conductive rail, the first auxiliary sliding contact line conductive rail, and the second auxiliary sliding contact line conductive rail. The main contact pin and the auxiliary contact pin are electrically connected. When the main sliding contact line conductive rail is connected to the main contact pin and the second auxiliary sliding contact line conductive rail is connected to the auxiliary contact pin, the drawer is in the test position and the warning light illuminates green. When the main sliding contact line conductive rail is connected to the main contact pin and the first auxiliary sliding contact line conductive rail is connected to the auxiliary contact pin, the drawer is in the connection position and the warning light illuminates red.

[0018] By adopting the above technical solution, when the drawer is mated to the cabinet, it can be pushed into the cabinet by the pushing mechanism. When the position indicator is in the disengaged position, neither the main contact pin nor the auxiliary contact pin is connected to the corresponding main sliding contact rail, the first auxiliary sliding contact rail, or the second auxiliary sliding contact rail, and the warning light is off. When the position indicator is in the test position, the main contact pin moves into the main sliding contact rail and connects, and the auxiliary contact pin moves into the second auxiliary sliding contact rail and connects. The main control board sends information to the main sliding contact rail, which then transmits it to the main contact pin, and then to the auxiliary contact pin. The signal is transmitted to the second auxiliary sliding contact rail, then to the main control board. After processing the information, the main control board sends a command to the warning light, causing the warning light to emit a green light. When the position indicator is in the connected position, the main contact pin moves within the main sliding contact rail and establishes connection. The auxiliary contact pin moves out of the second auxiliary sliding contact rail, then moves to the first auxiliary sliding contact rail and establishes connection. The main control board sends information to the main sliding contact rail, which then transmits it to the main contact pin, then to the auxiliary contact pin, then to the first auxiliary sliding contact rail, and finally to the main control board. After processing the information, the main control board sends a command to the warning light, causing the warning light to emit a red light.

[0019] The present invention is further configured such that the opening end faces of the main sliding contact line conductive rail, the first auxiliary sliding contact line conductive rail, and the second auxiliary sliding contact line conductive rail are all rounded.

[0020] In summary, this utility model has the following advantages:

[0021] The drive mechanism can be operated with one hand by means of a transmission screw, a grooved positioning component, a rocker handle, a driven gear, a secondary gear, a position indicator, and a rotary positioning device. The relative prompts of the position indicator and the warning device can distinguish whether the drawer is in a connected state, thus enabling the operator to operate the drive mechanism with one hand. Warnings are issued for the drawer in three states: disengaged, test, and connected, to prevent damage to the equipment caused by improper load application between the drawer and the pull-out switch cabinet. This achieves the purpose of simple operation and safety warning. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this embodiment;

[0023] Figure 2 This is a bottom view of the structure of the cabinet in this embodiment, omitting the cabinet itself;

[0024] Figure 3 yes Figure 2 A magnified structural diagram of A in the middle;

[0025] Figure 4 This is a schematic diagram of the propulsion mechanism in this embodiment;

[0026] Figure 5 This is a cross-sectional structural schematic diagram of the propulsion mechanism in this embodiment;

[0027] Figure 6 This is a schematic diagram of the propulsion mechanism from the right side in this embodiment.

[0028] Explanation of reference numerals in the attached drawings: 1. Bracket; 2. Drawer; 3. Drive screw; 4. Cabinet; 5. Slotted positioning component; 6. Handle; 7. Driven gear; 8. Secondary gear; 9. Position indicator; 10. Rotating support rod; 11. Drive gear; 12. Rotating sleeve; 13. Force spring; 14. Limiting block; 15. Positioning block; 16. Limiting plate; 17. Positioning hole; 18. Limiting flange; 19. Limiting sleeve; 20. Main contact pin; 21. Secondary contact pin; 22. Main sliding contact line conductive rail; 23. First secondary sliding contact line conductive rail; 24. Secondary sliding contact line conductive rail; 25. Controller; 26. Battery; 27. Warning light. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings.

[0030] A push mechanism for a withdrawable switchgear, such as Figure 1 , 2 As shown, the device includes a drive screw 3 mounted on the bottom plate of drawer 2 via a bracket 1, a slotted positioning component 5 mounted on the shelf of cabinet 4, and a crank handle 6. A driven gear 7, coaxial with and used to drive the drive screw 3, is mounted on the shaft at the end of the drive screw 3 away from the shelf of cabinet 4. A secondary drive gear 8, meshing with the driven gear 7, is rotatably mounted on the bracket 1. A position indicator 9 with three positions is mounted on the end of the secondary drive gear 8 away from the drive screw 3. A rotary positioning device, meshing with the driven gear 7 and used for three-position positioning, is rotatably mounted on the bracket 1. The rotary positioning device cooperates with the crank handle 6. The bracket 1 is equipped with a warning device for indicating the three-position connection status.

[0031] like Figure 1 , 2As shown in Figure 3, the warning device includes a main contact pin 20 and a secondary contact pin 21 mounted on the upper surface of the cabinet 4th layer plate; a main sliding contact conductive rail 22 mounted on the bracket 1 and located at the lower end of the drawer 2 bottom plate, electrically connected to the main contact pin 20; a first secondary sliding contact conductive rail 23 and a second secondary sliding contact conductive rail 24 mounted on the bracket 1 and located at the lower end of the drawer 2 bottom plate, electrically connected to the secondary contact pin 21; a controller 25 and a battery 26 mounted on the upper surface of the drawer 2 bottom plate; and a warning light 27 mounted on the side of the bracket 1 away from the transmission screw 3. The main sliding contact conductive rail 22, the first secondary sliding contact conductive rail 23, and the second secondary sliding contact conductive rail 24 are arranged parallel to each other and their extension directions are all consistent with the movement direction of the drawer 2 bottom plate. The sliding contact line is located at the end of the first auxiliary sliding contact line away from the position indicator 9, and the end faces of the first auxiliary sliding contact line and the second auxiliary sliding contact line correspond to each other. The controller 25 is electrically connected to the battery 26, the main sliding contact line conductive rail 22, the first auxiliary sliding contact line conductive rail 23, and the second auxiliary sliding contact line conductive rail 24. The main contact pin 20 is electrically connected to the auxiliary contact pin 21. When the main sliding contact line conductive rail 22 is connected to the main contact pin 20 and the second auxiliary sliding contact line conductive rail 24 is connected to the auxiliary contact pin 21, the drawer 2 is in the test position and the warning light 27 emits green light. When the main sliding contact line conductive rail 22 is connected to the main contact pin 20 and the first auxiliary sliding contact line conductive rail 23 is connected to the auxiliary contact pin 21, the drawer 2 is in the connection position and the warning light 27 emits red light.

[0032] When drawer 2 is mated to cabinet 4, it can be pushed into cabinet 4 via a push mechanism. When position indicator 9 is in the disengaged position, neither the main contact pin 20 nor the auxiliary contact pin 21 is connected to the corresponding main sliding contact rail 22, the first auxiliary sliding contact rail 23, or the second auxiliary sliding contact rail 24. At this time, the warning light 27 is off. When position indicator 9 is in the test position, the main contact pin 20 moves into the main sliding contact rail 22 and connects, and the auxiliary contact pin 21 moves into the second auxiliary sliding contact rail 24 and connects. The main control board sends information to the main sliding contact rail 22, which then transmits it to the main contact pin 20, then to the auxiliary contact pin 21, and finally to the second auxiliary sliding contact rail 24. The information is transmitted from the sliding contact line conductive rail 24 to the main control board. After processing the information, the main control board transmits the command to the warning light 27, causing the warning light 27 to emit a green light. When the position indicator 9 is in the connected position, the main contact pin 20 moves within the main sliding contact line conductive rail 22 and connects. The auxiliary contact pin 21 moves out of the second auxiliary sliding contact line conductive rail 24 and then moves into the first auxiliary sliding contact line conductive rail 23 and connects. The main control board sends information to the main sliding contact line conductive rail 22, which then transmits the information to the main contact pin 20, then to the auxiliary contact pin 21, then to the first auxiliary sliding contact line conductive rail 23, and finally to the main control board. After processing the information, the main control board transmits the command to the warning light 27, causing the warning light 27 to emit a red light.

[0033] Furthermore, the opening ends of the main sliding contact line conductive rail 22, the first auxiliary sliding contact line conductive rail 23, and the second auxiliary sliding contact line conductive rail 24 are all rounded.

[0034] like Figure 4 , 5 As shown, the rotary positioning device includes a rotary support rod 10 rotatably mounted on the bracket 1 and moving along its extension direction; a driving gear 11 coaxially mounted on the rotary support rod 10 and meshing with the driven gear 7; a rotating sleeve 12 coaxially mounted on the end of the rotary support rod 10 away from the transmission screw 3 and cooperating with the rocker handle 6; a force-applying spring 13 sleeved on the rotary support rod 10 and always applying a force to the rotary support rod 10 away from the direction of the transmission screw 3; and a limiting block 14 mounted on the end of the rotary support rod 10 away from the rotating sleeve 12. The bracket 1 is equipped with a positioning block 15 installed on the end face of the drive gear 11 facing the rotating sleeve 12. A limiting plate 16 is installed on the bracket 1 to fit against the end face of the drive gear 11 facing the rotating sleeve 12. The limiting plate 16 has three positioning holes 17 corresponding to the three positions on the position indicator disk 9. The positioning block 15 is engaged with any of the positioning holes 17. The axial extension length of the drive gear 11 is greater than the axial extension length of the driven gear 7. During the movement of the drive gear 11 along its length direction, the drive gear 11 and the driven gear 7 are always in a meshing state.

[0035] When it is necessary to apply force to the driven gear 7 through the rotary positioning device, the crank handle 6 can be installed on the rotating sleeve 12 first. Then, the crank handle 6 applies a force to the rotating sleeve 12 in the direction of the driving gear 11, causing the force spring 13 sleeved on the rotating support rod 10 to be further compressed and deformed. Then, the crank handle 6 applies a rotational force to the rotating sleeve 12, causing the driving gear 11 to drive the driven gear 7 to rotate. After the driving gear 11 rotates three degrees, the force applied by the rotating sleeve 12 in the direction of the driving gear 11 is removed. During the restoration process, the force spring 13 applies a force to the driving gear 11 in the direction of the limiting plate 16, causing the positioning hole 17 to abut against the limiting plate 16. Then, the crank handle 6 is rotated to drive the driving gear 11 to rotate. When the positioning block 15 rotates to any positioning hole 17, the positioning hole 17 is engaged with the positioning hole 17 due to the action of the force spring 13. At this time, the position indicator 9 stops at the corresponding position state, and the positioning block 15 abuts against the bracket 1.

[0036] Furthermore, such as Figure 5 , 6 As shown, both ends of the driving gear 11 have limiting flanges 18 extending from their edges, which interact with the end face of the driven gear 7. When the driving gear 11 moves along its cross-sectional extension direction, the limiting flanges 18 on the driving gear 11 can stop moving when they reach the end face of the driven gear 7, effectively preventing the driving gear 11 from disengaging from the driven gear 7.

[0037] It is worth mentioning that a limiting sleeve 19 is installed on the bracket 1 to fit the rotating support rod 10, which can effectively limit the rotating support rod 10.

[0038] The working process and beneficial effects of this utility model are as follows:

[0039] When drawer 2 is installed into cabinet 4, the rotary positioning device is activated by applying force to the crank handle 6 with one hand. This causes the rotary positioning device to rotate the driven gear 7, which in turn rotates the transmission screw 3 and interacts with the slotted positioning component 5. This causes drawer 2 to enter cabinet 4. During the rotation of driven gear 7, the driven gear 7 also rotates the auxiliary gear 8 it meshes with, causing the position indicator 9, which rotates with the auxiliary gear 8, to move together. When the position indicator 9 rotates to any specific indicated position, the rotary positioning device can perform a limit braking. When the internal components of drawer 2 are loosely connected to the internal components of cabinet 4, the warning device does not activate, indicating that drawer 2 is in a separated position. When the position indicator 9 is in a test position and the warning device issues a corresponding warning, this indicates that drawer 2 is in a test position. When the position indicator 9 is in a connected position and the warning device issues a corresponding warning, this indicates that drawer 2 is in a connected position.

[0040] In summary, the aforementioned transmission screw 3, grooved positioning component 5, rocker handle 6, driven gear 7, auxiliary gear 8, position indicator 9, and rotary positioning device enable the operator to operate the propulsion mechanism with one hand. Furthermore, the relative prompts from the position indicator 9 and the warning device allow the operator to determine whether drawer 2 is in a connected state. This allows the operator to operate the propulsion mechanism with one hand, and provides warnings in three states: the drawer 2 is in a disengaged position, a test position, and a connected position. This prevents damage to the equipment caused by the drawer 2 being improperly loaded with a load on the pull-out switch cabinet, achieving the goals of convenient operation and safety warnings.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A push mechanism for a pull-out switch cabinet, comprising a drive screw (3) mounted on the bottom plate of a drawer (2) via a bracket (1), a slotted positioning member (5) mounted on a shelf of the cabinet (4), and a crank handle (6), characterized in that: The drive screw (3) is provided with a driven gear (7) on the shaft at the end away from the cabinet (4) shelf. The driven gear (7) is coaxial with the drive screw (3) and is used to drive the drive screw (3) to rotate. The bracket (1) is provided with a secondary drive gear (8) that meshes with the driven gear (7). The secondary drive gear (8) is provided with a position indicator disk (9) with three positions at the end away from the drive screw (3). The bracket (1) is provided with a rotary positioning device that meshes with the driven gear (7) to rotate and is used for three-position positioning. The rotary positioning device cooperates with the crank (6). The bracket (1) is provided with a warning device for indicating the three-position connection status.

2. The push mechanism for a withdrawable switchgear according to claim 1, characterized in that: The rotary positioning device includes a rotary support rod (10) rotatably mounted on the bracket (1) and moving along its extension direction; a drive gear (11) coaxially mounted on the rotary support rod (10) and meshing with the driven gear (7); a rotary sleeve (12) coaxially mounted on the end of the rotary support rod (10) away from the transmission screw (3) and cooperating with the rocker handle (6); a force-applying spring (13) sleeved on the rotary support rod (10) and always applying a force to the rotary support rod (10) away from the direction of the transmission screw (3); a limiting block (14) mounted on the end of the rotary support rod (10) away from the rotary sleeve (12); and a limit block (14) mounted on the drive gear. (11) A positioning block (15) facing one end face of the rotating sleeve (12). The bracket (1) is provided with a limiting plate (16) that fits against the end face of the driving gear (11) facing the rotating sleeve (12). The limiting plate (16) is provided with three positioning holes (17) corresponding to the three positions on the position indicator disk (9). The positioning block (15) is engaged with any of the positioning holes (17). The axial extension length of the driving gear (11) is greater than the axial extension length of the driven gear (7). During the movement of the driving gear (11) along its length direction, the driving gear (11) and the driven gear (7) are always in a meshing state.

3. The push mechanism for a withdrawable switchgear according to claim 2, characterized in that: The driving gear (11) has limiting flanges (18) on both ends of its edge that interact with the end face of the driven gear (7).

4. The push mechanism for a withdrawable switchgear according to claim 2, characterized in that: The bracket (1) is provided with a limiting sleeve (19) on which the rotating support rod (10) is sleeved.

5. The push mechanism for a withdrawable switchgear according to claim 1, characterized in that: The warning device includes a main contact pin (20) and a secondary contact pin (21) on the upper surface of the cabinet (4) shelf, a main sliding contact line conductive rail (22) on the bracket (1) and located at the lower end of the drawer (2) bottom plate and electrically connected to the main contact pin (20), a first secondary sliding contact line conductive rail (23) and a second secondary sliding contact line conductive rail (24) on the bracket (1) and located at the lower end of the drawer (2) bottom plate and electrically connected to the secondary contact pin (21), a controller (25) and a battery (26) on the upper surface of the drawer (2) bottom plate, and a warning light (27) on the side of the bracket (1) away from the transmission screw (3). The main sliding contact line conductive rail (22), the first secondary sliding contact line conductive rail (23) and the second secondary sliding contact line conductive rail (24) are arranged parallel to each other and their extension directions are all consistent with the moving direction of the drawer (2) bottom plate. The secondary sliding contact line is located at the end of the first secondary sliding contact line away from the position indicator disk (9), and the end face interfaces of the first secondary sliding contact line and the second secondary sliding contact line correspond to each other. The controller (25) is electrically connected to the battery (26), the main sliding contact line conductive rail (22), the first secondary sliding contact line conductive rail (23), and the second secondary sliding contact line conductive rail (24). The main contact pin (20) is electrically connected to the secondary contact pin (21). When the main sliding contact line conductive rail (22) is connected to the main contact pin (20) and the second secondary sliding contact line conductive rail (24) is connected to the secondary contact pin (21), the drawer (2) is in the test position state, and the warning light (27) emits green light. When the main sliding contact line conductive rail (22) is connected to the main contact pin (20) and the first secondary sliding contact line conductive rail (23) is connected to the secondary contact pin (21), the drawer (2) is in the connection position state, and the warning light (27) emits red light.

6. The push mechanism for a withdrawable switchgear according to claim 5, characterized in that: The opening ends of the main sliding contact line conductive rail (22), the first auxiliary sliding contact line conductive rail (23), and the second auxiliary sliding contact line conductive rail (24) are all rounded.

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