CN203617603U - Pushing mechanism for drawer unit of switch cabinet - Google Patents

Abstract

The utility model discloses a push mechanism for a switch cabinet drawer unit, which comprises: a transmission mechanism, which includes a push screw, a positioning piece and a driving shaft capable of transmission connection to drive the movement of the push screw; The clutch mechanism between the shaft and the propulsion screw is connected to the drive shaft and the propulsion screw and can change between the clutch states; the force transmission plate is slidably connected to the drawer unit, and the transmission is connected to the clutch mechanism, and the movement of the force transmission plate can drive the clutch mechanism in the clutch state. State change: a locking bracket and a guide rail fixedly connected to the switch cabinet, the drawer unit is slidably connected to the guide rail, the locking bracket is movably connected to the drawer unit and is in a lock position that can be locked on the guide rail and a loose lock that can release the lock. The force transmission plate is connected to the lock bracket and drives the lock bracket to move between the lock position and the loose position. It has the following advantages: preventing violent damage to the mechanism, preventing the transmission mechanism from being stuck, and simple operation.

Description

Switch cabinet drawer unit push mechanism

technical field

The utility model relates to a push mechanism for a switch cabinet drawer unit.

Background technique

The drawer unit of the switch cabinet relies on the push mechanism of the drawer unit to realize the entry and exit of the cabinet. At present, there are many such products on the market, including a direct hand pull mechanism, a dial mechanism, and a rotary push mechanism. Some of these mechanisms There are only position indications of the drawers, and the position of the drawers cannot be locked. Although some can be locked, the operation is cumbersome. The existing rotary propulsion mechanism (such as patent 200720040526.8, patent 200820030888.3) has the following disadvantages: 1. The crank handle is directly connected with the screw propulsion mechanism. Shaking the handle will cause damage to the mechanism; 2. To unlock the locking mechanism, you need to hold down the unlocking lever and operate the propulsion mechanism at the same time to unlock, and the operation requirements are complicated; 3. The positioning part of the rotary propulsion mechanism is a groove type positioning part, so The meshing surface between the screw and the groove-shaped positioning part is small. During the push of the drawer, if encountering a large resistance, the groove-type positioning part will be deformed, causing the drive screw to slip off and the mechanism to be stuck; 4. The drawer is at the initial position ( That is, the separation position), it must be ensured that the push mechanism is in the separation position. If the initial position is incorrect, the drawer will not be pushed in place.

Utility model content

The utility model provides a push mechanism for a switch cabinet drawer unit, which overcomes the damage to the mechanism caused by the forcible shaking of the handle in the background technology, complicated operation requirements, the mechanism is stuck due to the sliding of the transmission screw, and the push mechanism at the initial position must be separated. The downside of the location.

The technical solution adopted by the utility model to solve its technical problems is:

The push mechanism for the drawer unit of the switch cabinet includes: a transmission mechanism, which includes a push screw capable of driving the drawer unit in and out, a positioning member fixed relative to the switch cabinet, and a drive shaft capable of transmission connection to drive the movement of the push screw, The positioning member is provided with a threaded part, and the advancing screw is engaged with the threaded part;

A clutch mechanism arranged between the drive shaft and the propulsion screw, which connects the drive shaft and the propulsion screw and can change between clutch states;

A force transmission plate slidably connected to the drawer unit, which is connected to the clutch mechanism through transmission, and the movement of the force transmission plate can drive the clutch mechanism to change in the clutch state;

A locking bracket and a guide rail fixedly connected to the switch cabinet. The drawer unit is slidably connected to the guide rail. The locking bracket is movably connected to the drawer unit and moves between a lock position capable of being locked on the guide rail and a loose position capable of releasing the lock connection. , the force transmission plate is connected to the locking bracket by transmission and drives the locking bracket to move between the locked position and the loose position, and the first direction is perpendicular to the second direction.

In one embodiment: the clutch mechanism includes a clutch force transmitting member and a clutch force receiving pin, the clutch force transmitting member has an inner rotating surface, and the inner rotating surface is provided with a card slot, and the propulsion screw is provided with a mounting groove. The clutch force pin is slidably installed in the installation groove, and a spring capable of resisting the clutch force pin is provided in the installation groove, and the clutch mechanism is controlled to be in the on-off state by whether the clutch force pin falls into the slot.

In one embodiment: the clutch transmission member is movably connected to the drawer unit and moves between the first position and the second position, the clutch transmission member is provided with a guide surface, and the clutch transmission member moves from the second position to the second position through the guide surface. In the first position, it pushes against the clutch force pin so that the force pin retracts into the installation groove; the force transmission plate pushes against the clutch force transmission part, and the clutch force transmission part can be driven to the first position and the second position through the force transmission plate between activities.

In one embodiment: the guide rail is provided with a plurality of locking holes, the locking bracket at the lock position is plugged into the locking holes, and the locking bracket at the loose position is pulled out of the locking holes.

In one embodiment, a spring piece is further included, the spring piece includes a fixed piece fixed to the drawer unit and an inclined piece fixed to one end of the fixed piece, and the end of the inclined piece is fixed to the force transmission plate.

In one embodiment: an unlocking button is further included, the drawer unit includes an operation panel, the unlocking button is slidably connected to the operating panel, and the unlocking button abuts against the force transmission plate.

In one embodiment: it also includes a reset pin movably connected to the drawer unit and a fixed bracket fixed relative to the switch cabinet, the reset pin pushes against the force transmission plate, the fixed bracket has two curved sides, and the drawer unit is provided with an inclined Slot; push the force transmission plate through the unlock button to drive the force transmission plate to slide inward and compress the spring piece, release the force transmission plate through the spring piece to slide obliquely into the chute; through the force transmission plate slide into the chute or exit The chute drives the locking bracket to move between the loose position and the locked position, and the curved side can withstand the reset pin and when the drawer unit reaches the isolated position, the test position and the working position, the reset pin can withstand the force transmission plate and Provide the restoring force for the force transmission plate to exit the chute.

In one embodiment: it also includes a three-position indicating device, the three-position indicating device is rotatably connected to the drawer unit, and the three-position indicating device is provided with a sign showing the current position of the drawer unit, and the eccentric position of the three-position indicating device is set There is a position calibration rod, and the position calibration rod can withstand the other curved side of the fixing bracket and drive the indicator board to rotate.

In one embodiment, it also includes an interlocking bracket fixedly connected to the drawer unit, an operating lever bracket that is rotatably connected to the interlocking bracket and can be used for closing and opening operations of the circuit breaker, and an operating lever bracket that is slidably connected to the interlocking bracket and is connected by transmission. The interlocking plate of the operating rod bracket, the chute is set on the bonding part of the interlocking bracket and the bottom plate of the drawer, and the interlocking plate can be in the third position corresponding to the closing of the circuit breaker and the fourth position corresponding to the opening of the circuit breaker. The force transmission plate sliding into the chute can restrict the sliding of the interlocking plate from the fourth position to the third position and limit the closing of the circuit breaker, and the interlocking plate in the third position can limit the transmission The force plate slides into the chute.

In one embodiment: the positioning member is provided with an arc-shaped groove, and the inner arc surface of the arc-shaped groove is provided with threads.

Compared with the background technology, this technical solution has the following advantages:

1. The push mechanism of the drawer unit of the switch cabinet, which includes a clutch mechanism arranged between the drive shaft and the push screw, which connects the drive shaft and the push screw and can change between the clutch states. The crank is connected with the propulsion screw, and only when the clutch mechanism is in the state of closing, can the movement of the crank be transmitted to the propulsion screw, otherwise the crank will be idling, which can avoid forcible shaking of the crank in the case of misoperation, causing damage to the mechanism.

2. It also includes an unlocking button and a reset pin that is movably connected to the drawer unit. The unlocking button is pressed against the force transmission plate. The drawer unit is provided with a chute, and the force transmission plate is driven by pressing the unlocking button briefly against the force transmission plate. Sliding inward and compressing the spring piece, through the release of the spring piece, the force transmission plate slides obliquely into the chute or the reset pin pushes against the force transmission plate and provides the restoring force for the force transmission plate to exit the chute, driving the locking bracket It can be moved between the loose position and the locked position. To unlock the locking mechanism, you only need to press the unlocking button briefly to let go, and then shake the handle, which is easier to operate.

3. The positioning part is an arc-shaped threaded positioning part, which increases the meshing surface of the transmission mechanism, increases the strength of the transmission mechanism, and makes it difficult to deform and get stuck.

4. The transmission mechanism includes a push screw that can drive the drawer unit in and out, a positioning member that is fixed relative to the switch cabinet, and a drive shaft that can be connected by transmission to drive the drive screw to move, wherein the push screw moves with the drawer unit, that is, Relative to the drawer unit, the transmission mechanism is not directly connected to the three-position indicating device, so the initial position of the drawer put into the cabinet has nothing to do with the transmission mechanism.

5. The force transmission plate sliding into the chute can limit the sliding of the interlocking plate from the fourth position to the third position and limit the closing of the circuit breaker, and the interlocking plate at the third position can limit the sliding of the force transmission plate Into the chute, to ensure that the circuit breaker cannot be closed during the movement of the drawer unit, and the drawer unit cannot be moved when the circuit breaker is closed, so as to realize the interlock between the push of the drawer unit and the closing and opening of the circuit breaker.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

FIG. 1 shows a perspective view of the push mechanism of the drawer unit, which corresponds to the unlocked state of the drawer unit.

FIG. 2 shows a top view of the push mechanism of the drawer unit, which corresponds to the unlocked state of the drawer unit.

Fig. 3 shows the front view of the push mechanism of the drawer unit.

Fig. 4 shows a partial enlarged view of the portion with the chute.

Fig. 5 shows a cross-sectional view of a transmission mechanism and a clutch mechanism.

FIG. 6 shows a schematic perspective view of the indicating device.

FIG. 7 is a schematic front view of the interlocking bracket.

FIG. 8 is a schematic perspective view of the middle partition of the switch cabinet fixed relative to the switch cabinet.

Detailed ways

Please refer to Figure 1 to Figure 7, the push mechanism of the switchgear drawer unit, which includes:

A transmission mechanism 10, the transmission mechanism 10 includes a push screw 11 that can drive the drawer unit in and out, a positioning member 12 that is fixed relative to the switch cabinet (that is, located on the middle partition of the switch cabinet), and a transmission connection to drive the push screw 11 Moving drive shaft 13, the locator 12 is provided with a threaded part, and the propulsion screw 11 is engaged with the threaded part. Preferably, the locator 12 is an arc-shaped threaded locator, that is, the locator is provided with an arc-shaped groove, and the arc-shaped groove Threads are provided on the inner arc surface.

A clutch mechanism 20 arranged between the drive shaft 13 and the propulsion screw 11 connects the drive shaft 13 and the propulsion screw 11 and can change between clutch states;

A force transmission plate 30 slidingly connected to the drawer unit is connected to the clutch mechanism 20 by transmission. The movement of the force transmission plate 30 can drive the clutch mechanism 20 to change in the clutch state. The force transmission plate 30 is provided with a guide groove 31, and the guide groove 31 includes A first groove along the first direction and a second groove along the second direction intersecting the first groove; the drawer unit includes a drawer bottom plate, and the bottom plate of the drawer unit is provided with a first guide column 32; the first guide column 32 is adapted to slide and connect with the guide groove 31, the first direction is perpendicular to the second direction, and the second groove and the first groove are vertically arranged; the force transmission plate 30 is fixed with a second guide column 33 .

A locking bracket 40 and a guide rail 50 fixedly connected to the switch cabinet. The drawer unit is slidably connected to the guide rail 50. The locking bracket 40 is movably connected to the drawer unit and can be locked in a lock position on the guide rail 50 and a position for releasing the lock. The movement between the loose positions, the sliding direction of the locking bracket 40 is along the second direction; the locking bracket 40 is provided with an inclined groove 41, and through the cooperation of the second guide post 33 and the inclined groove 41, when the force transmission plate 30 slides along the guide groove, it can drive The locking bracket 40 slides along the second direction and drives the locking bracket 40 to move between the lock position and the loose position.

In a preferred embodiment, the clutch mechanism 20 includes a clutch force transmitting member 21 and a clutch force receiving pin 22, the clutch force transmitting member 21 has an inner rotating surface, and the inner rotating surface is provided with a card slot 211, and the push screw is concave There is an installation groove 111, the clutch force pin 22 is slidably installed in the installation groove 111, and a spring 1111 that can withstand the clutch force pin 22 is arranged in the installation groove 111, and whether the clutch force pin 22 falls into the The locking slot 211 controls the clutch mechanism 20 to be in the on-off state. The clutch transmission member 21 is movably connected to the drawer unit and moves between the first position and the second position. The clutch transmission member 21 is provided with a guide surface 212, and the clutch transmission member 21 is moved from the second position to the first position through the guide surface 212. When the position is reached, the clutch force pin 22 retracts when the guide surface acts, the spring compresses and stores energy, and exits the card slot 211; when moving from the first position to the second position, under the action of the spring, the clutch force pin 22 enters In the card slot 211; the force transmission plate 30 is pressed against the clutch force transmission member 21, and the clutch force transmission member 21 can be driven to move from the first position to the second position or from the second position to the first position through the force transmission plate 30, Wherein, the first position is the position of the clutch force transmitting member 21 when the clutch force transmitting member 21 and the clutch force receiving pin 22 are in a separated state, and the second position is when the clutch force transmitting member 21 and the clutch force receiving pin 22 are in a state of separation. The position of the clutch transmission member 21 when adapting to the connected state. In this embodiment, the force transmission plate 30 is provided with a fork, and the fork is set outside the clutch force transmission member 21, and the outer turning surface of the clutch force transmission member 21 is provided with an annular step, and the fork is pressed against the annular step. In this way, the clutch transmission member 21 is driven to move.

The guide rail 50 is provided with a plurality of locking holes 51, the locking bracket 40 at the lock position is plugged into the locking holes 51, and the locking bracket 40 at the loose position is pulled out of the locking holes 51. In a preferred embodiment, the guide rail 50 is provided with three locking holes. There are two locking holes 51, which respectively correspond to the locking holes for locking the clutch position, the locking holes for locking the test position, and the locking holes for locking the working position.

Also includes a spring piece 60, the spring piece 60 includes a fixed piece 61 fixed to the drawer unit and an inclined piece 62 fixed on one end of the fixed piece, the end of the inclined piece 62 is fixed to the force transmission plate 30, preferably, the The end of the inclined piece 62 is fixed with a connection plate, and the force transmission plate is fixedly connected to the connection plate, so that the force generated when the spring piece releases energy is a torque, which can drive the force transmission plate to decompose and contain lateral motion or activities include lateral motion , enabling the force plate to fall into the chute.

It also includes an unlock button 70, a reset pin 80 movably connected to the drawer unit and a fixed bracket 90 fixed to the switch cabinet (that is, located on the middle partition of the switch cabinet). The drawer unit includes an operation panel, and the unlock button 70 can be moved along The operation panel is slidably connected in the first direction, the unlocking button 70 abuts against the force transmission plate 30 , the reset pin 80 abuts against the force transmission plate 30 , the fixing bracket 90 has two curved sides, and the drawer unit is provided with a chute 34 , The curved side 91 can withstand the reset pin 80 and when the drawer unit reaches the isolation position, the test position and the working position, the reset pin 80 can withstand the force transmission plate 30 and provide the force transmission plate 30 with the force transmission plate 30 to exit the chute 34. Restoration force, press the release button 70 shortly against the force transmission plate 30 to drive the force transmission plate 30 to slide inward along the first direction and compress the spring piece 60, and release the energy through the spring piece 60 to make the force transmission plate 30 obliquely slide into the chute 34 or through the reset pin 80 against the force transmission plate 30 to exit the chute 34, driving the locking bracket 40 to move between the loose position and the locked position.

It also includes a three-position indicating device 100, the three-position indicating device 100 is rotatably connected to the drawer unit, and the three-position indicating device is provided with a sign 110 showing the current position (isolation, test, work) of the drawer unit, the three-position indicating device A position calibration rod 120 is provided at the eccentric position of the device, and the position calibration rod 120 can withstand the other curved side 92 of the fixed bracket 90. During the movement of the drawer unit, the curved side 92 is pressed against the position calibration rod 120 to move, and the calibration rod 120 The activity drives the sign 110 to rotate, so as to rotate to the current position of the drawer, that is, the isolation, test and working positions.

It also includes an interlocking bracket 200 fixedly connected to the drawer unit, an operating rod bracket 210 that is rotatably connected to the interlocking bracket 200 and can be used for closing and opening operations of the circuit breaker, and an operating rod bracket 210 that is slidingly connected to the interlocking bracket 200 and is connected to the operation The interlocking plate 220 of the rod bracket 210, the chute 34 is provided at the bonding part of the interlocking bracket 200 and the bottom plate of the drawer, and the interlocking plate 220 can be in the third position corresponding to the closing of the circuit breaker and corresponding to the opening of the circuit breaker. The force transmission plate 30 sliding into the chute 34 can restrict the sliding of the interlocking plate 220 from the fourth position to the third position and limit the closing of the circuit breaker. The interlocking plate 220 in the third position The locking plate 220 can restrict the force transmission plate 30 from sliding into the chute 34; in a preferred solution, the force transmission plate 30 is fixedly connected with an "L" shaped fastener, and the interlocking plate 220 is a "Z" shaped fastener, the The "L" shaped fastener has a first horizontal piece and a first vertical piece, and the "Z" shaped fastener has two second horizontal pieces and a second vertical piece. The first vertical piece of the force transmission plate 30 can block the movement of a second horizontal piece of the interlocking plate 220 and limit the movement of the interlocking plate 220 from the fourth position to the third position when the force transmission plate 30 slides into the chute 34 Sliding, a second horizontal piece of the interlocking plate 220 can block the movement of the first vertical piece and restrict the force transmission plate 30 from sliding into the chute 34 when the interlocking plate 220 is in the third position.

The specific implementation of the switch cabinet drawer push mechanism is as follows: when the drawer is in the isolated position (initial position), the circuit breaker is opened, the three-position locking device is in the locked state, and the clutch mechanism is in the separated state. At this time, if you want to push the drawer unit, you need to press the unlock button 70 first. When the unlock button 70 is pressed, the force transmission plate 30 moves inward along the guide groove 31, and the spring leaf 60 is deformed under pressure. When the force transmission plate 30 moves When reaching the chute 34 on the drawer unit, the force transmission plate 30 slides into the chute 34 under the restoring force of the spring leaf 60, and drives the locking bracket 40 to slide to the right, and the locking bracket 40 pulls out the locking hole 51 on the guide rail 50 ; While the force transmission plate 30 moves inward, the force transmission plate 30 moves the clutch force transmission member 21 from the first position to the second position, that is, the clutch force receiving pin 22 passes through the guide surface of the clutch force transmission member 21 212 enters the card slot 211, and the spring 1111 under the clutch force pin 22 resists to make the clutch force transmission member 21 fit and connect with the clutch force pin 22. At this time, the unlocking is completed, and the clutch mechanism 20 is connected to the active The shaft 13 and the propulsion screw 11 can be connected to the drive shaft 13 through the crank handle 300 and the drive shaft 13 of the transmission mechanism can be shaken clockwise to drive the clutch transmission part 21 to rotate, and the clutch force transmission part 21 can make the propulsion screw 11 through the clutch force pin 22 Movement, the drawer can be pushed forward due to the reaction force of the arc-shaped threaded positioning part 12 fixed on the switch cabinet. When the drawer unit is in the unlocked state, since the stroke of the interlock plate 200 is limited by the force transmission plate 30 sliding into the chute 34, the circuit breaker cannot be closed, and the interlock of the circuit breaker that cannot be closed during the movement of the drawer (such as Figure 2). Until entering the test position, because the reset pin 80 is pushed against by the protruding position on the right side curved side 91 of the fixed bracket 90 at the test position, the reset pin 80 slides to the right and pushes against the force transmission plate 30 to slide out The chute 34 slides down to the initial state against the unlocking button 70 under the restoring force of the spring leaf 60, and at the same time, the force transmission plate 30 drives the locking bracket 40 to move to the left and insert it into the locking hole 51 on the guide rail 50, At the same time, the force transmission plate 30 moves the clutch force transmission member 21 from the second position to the first position, and the clutch force pin 22 slides out of the draw-in groove 211 of the clutch force transmission member 21. At this time, the clutch mechanism 20 is in a separated state, and then shake Shake the handle 300, then it is idling, to protect the propulsion mechanism from being damaged by violent operation, and realize the locking of the drawer unit. At this time, the circuit breaker is allowed to close, and the interlocking plate 200 slides to the right while restricting the movement of the force transmission plate 30 inwards, so that the drawer unit cannot be unlocked by the unlock button 70, so that the circuit breaker cannot be locked when the circuit breaker is closed. Interlocks for moving drawers.

While the drawer unit is being pushed forward, the position calibration rod 120 always points the sign 110 to the isolated position under the reaction force of the torsion spring 130 until the position calibration rod 120 touches the left side curved side 92 of the fixing bracket 90 , the curved side 92 abuts against the position calibration rod 120. At this time, the reaction force of the torsion spring 130 is smaller than the abutting force of the left curved side 92, so that the indicator 110 is rotated until it points to the test position. At this time, the mechanism is in the test location.

If it is necessary to continue to advance, it is necessary to open the circuit breaker and press the unlocking button 70, and then shake the handle 300 clockwise, and the movement process is the same as above. The operation mode when withdrawing is the same as the operation mode when advancing, only the shaking direction of the crank handle 300 is counterclockwise.

In a preferred solution, when the drawer unit is in the locked state, a padlock can be installed on the unlocking button to lock the drawer in the corresponding position, so as to avoid unauthorized operation of the drawer and ensure user safety.

The above is only a preferred embodiment of the utility model, so the scope of implementation of the utility model cannot be limited accordingly, that is, the equivalent changes and modifications made according to the patent scope of the utility model and the contents of the specification should still belong to this utility model. within the scope of utility models.

Claims (10)

1. The push mechanism of the switch cabinet drawer unit is characterized in that it includes: A transmission mechanism, including a push screw that can drive the drawer unit in and out, a positioning member that is fixed relative to the switch cabinet, and a driving shaft that can be connected by transmission to drive the movement of the push screw. The positioning member has a threaded part, and the push screw and the threaded part Engage; A clutch mechanism arranged between the drive shaft and the propulsion screw, which connects the drive shaft and the propulsion screw and can change between clutch states; A force transmission plate slidably connected to the drawer unit, which is connected to the clutch mechanism through transmission, and the movement of the force transmission plate can drive the clutch mechanism to change in the clutch state; A locking bracket and a guide rail fixedly connected to the switch cabinet. The drawer unit is slidably connected to the guide rail. The locking bracket is movably connected to the drawer unit and moves between a lock position capable of being locked on the guide rail and a loose position capable of releasing the lock connection. , the power transmission plate is connected to the locking bracket through transmission and drives the locking bracket to move between the lock position and the loose position. 2. The push mechanism of the drawer unit of the switchgear according to claim 1, characterized in that: the clutch mechanism includes a clutch transmission member and a clutch force pin, the clutch transmission member has an inner rotary surface, and the inner rotary surface Along the card groove, the propulsion screw is provided with a mounting groove, the clutch force pin is slidably installed in the installation groove, and a spring capable of resisting the clutch force pin is arranged in the installation groove, and whether the clutch force pin is Falling into the card slot controls the clutch mechanism to be in the on-off state. 3. The push mechanism of the drawer unit of the switchgear according to claim 2, characterized in that: the clutch transmission member is movably connected to the drawer unit and moves between the first position and the second position, and the clutch transmission member is provided with a guide surface, Through the guide surface, when the clutch power transmission member moves from the second position to the first position, it pushes against the clutch force pin so that the force pin retracts into the installation groove; It can drive the clutch transmission member to move between the first position and the second position. 4. The push mechanism of the switchgear drawer unit according to claim 1, characterized in that: the guide rail is provided with a plurality of locking holes, the locking bracket at the lock position is plugged into the locking hole, and the locking bracket at the loose position is pulled out to lock hole. 5. According to claim 1 or 2 or 3 or 4 described switchgear drawer unit push mechanism, it is characterized in that: it also comprises a spring piece, and this spring piece comprises a fixing piece fixedly connected to the drawer unit and a fixed piece fixed on the An inclined piece at one end of the piece, and the end of the inclined piece is fixed to the force transmission plate. 6. The push mechanism of the switchgear drawer unit according to claim 5, characterized in that it also includes an unlocking button, the drawer unit includes an operation panel, the unlocking button is slidably connected to the operation panel, and the unlocking button pushes against the force transmission plate . 7. The push mechanism of the switch cabinet drawer unit according to claim 6, characterized in that: it also includes a reset pin movably connected to the drawer unit and a fixed bracket fixed to the switch cabinet, the reset pin pushes against the force transmission plate, The fixed bracket has two curved sides, and the drawer unit is provided with a chute; the force transmission plate can be driven to slide inward and compress the spring piece by pressing the unlocking button against the force transmission plate, and the force transmission plate can be retracted obliquely and dropped by the release of the spring piece. into the chute; the force transmission plate slides into the chute or withdraws from the chute to drive the locking bracket to move between the loose position and the locked position, and the curved side can withstand the reset pin and reach the isolation position in the drawer unit. position and working position, the reset pin pushes against the force transmission plate and provides a restoring force for the force transmission plate to exit the chute. 8. The push mechanism for the drawer unit of the switchgear according to claim 7, characterized in that: it also includes a three-position indicating device, which is rotatably connected to the drawer unit, and the three-position indicating device is provided with a display for displaying the current position of the drawer unit. The three-position indicating device is provided with a position calibration rod at the eccentric position, and the position calibration rod can be pressed against the other curved side of the fixing bracket and drive the indicator board to rotate. 9. The push mechanism for the drawer unit of the switchgear according to claim 7, characterized in that it also includes an interlock bracket fixedly connected to the drawer unit, a rotatably connected interlock bracket and capable of closing and opening the circuit breaker. The operating rod bracket and an interlocking plate slidingly connected to the interlocking bracket and drivingly connected to the operating rod bracket. Sliding between the corresponding third position and the fourth position corresponding to the opening of the circuit breaker, the force transmission plate sliding into the chute can limit the sliding of the interlocking plate from the fourth position to the third position and limit the closing of the circuit breaker , the interlocking plate at the third position can limit the force transmission plate from sliding into the chute. 10. The push mechanism of the switchgear drawer unit according to claim 1 or 2 or 3 or 4, characterized in that: the positioning member is provided with an arc-shaped groove, and the inner arc surface of the arc-shaped groove is provided with threads.

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