Retaining device of handcart propulsion mechanism of switch cabinet

Abstract

The utility model belongs to the technical field of propulsion mechanisms, and provides a retaining device of a switch cabinet handcart propulsion mechanism, which comprises a ratchet wheel, a pawl, a first reset torsion spring, a pin, an interlocking plate, a screw, a cotter pin, a clutch box, a cross beam support, a valve pressing plate, a lead screw, a nut seat, an interlocking rod and a small crank arm. According to the utility model, through the clutch box, the small crank arm, the interlocking rod, the interlocking plate, the screw, the cotter pin, the ratchet wheel, the first reset torsion spring and the pawl, the problem of complex structure of the existing switch cabinet handcart propulsion mechanism retaining device is solved, and the retaining function of the device is realized through fewer transmission structures; through the ratchet wheel, the pawl and the first reset torsion spring, the defect that existing equipment can stop retreating only when the lead screw works till the ratchet wheel makes contact with the pawl is overcome, and the retreating stopping function at any position is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of propulsion mechanisms, in particular to a backstop device for a switch cabinet trolley propulsion mechanism. Background Art

[0002] In existing high-voltage switch cabinets, to facilitate maintenance and improve the reliability of power supply, circuit breakers and various electrical units are often made into switch cabinet trolleys to make them movable components. Common switch cabinet trolleys include circuit breaker trolleys, isolating trolleys, voltage transformer trolleys, etc. These switch cabinet trolleys need to adopt necessary propulsion mechanisms to realize the propulsion and pulling out of the trolley in the switch cabinet, and have necessary anti-misoperation interlocking functions. Currently, the propulsion mechanisms of switch cabinet trolleys basically use screws and nuts to transmit power to push or pull the trolley. For the existing trolley propulsion mechanisms, whether it is electric operation or manual operation, an interlocking shaft operating piece and an interlocking square rod are set to realize various anti-misoperation interlocks of the trolley. When the trolley propulsion mechanism reaches the designated position, the screw needs to be fixed to prevent the circuit breaker from closing and opening, transportation, etc. vibrations from causing the screw to rotate and resulting in failures and accidents. To prevent the screw from rotating, the existing trolley propulsion mechanism is realized by a spring clamping method, which is very unreliable. When the vibration force on the screw exceeds the frictional force of the spring clamping, the screw will rotate erroneously, causing trolley failures. In severe cases, the moving and static contacts in the switch cabinet will be separated, resulting in power consumption accidents.

[0003] A propulsion mechanism with an interlocking function disclosed in the patent with the publication number of 201521101769.9 solves this problem by setting a ratchet and a pawl adapted to the ratchet at the end of the lead screw. When the lead screw rotates to the working position, the interlocking square rod is rotated by pulling the interlocking shaft operating piece, and then the ratchet and the pawl can limit the rotation of the lead screw through a certain interlocking cooperation. However, this method has too many intermediate transmission links, is relatively complex, has a high failure rate, and the ratchet and the pawl are set at the end of the lead screw, and can only function when the ratchet and the pawl come into contact when the lead screw rotates to the working position. When the trolley is in the test position, there is a certain distance between the relative positions of the ratchet and the pawl adopted by this method, and it cannot play a limiting role. Therefore, there are technical defects. Summary of the Utility Model

[0004] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a backstop device for a switch cabinet trolley propulsion mechanism, which solves the problem of the complex structure of the existing backstop device for a switch cabinet trolley propulsion mechanism through a clutch box, a small crank arm, an interlocking rod, an interlocking plate, a screw, an open pin, a ratchet, a first reset torsion spring, and a pawl, and realizes the backstop function of the device through fewer transmission structures; through the ratchet, the pawl and the first reset torsion spring, it solves the defect that the existing equipment needs the lead screw to work until the ratchet and the pawl come into contact to stop retreating, and realizes the backstop function at any position.

[0005] To achieve the above object, the present utility model provides the following solutions:

[0006] A backstop device for a handcart propulsion mechanism of a switch cabinet, comprising: a ratchet wheel, a pawl, a first return torsion spring, a pin, an interlock plate, a screw, a split pin, a clutch box, a crossbeam bracket, a valve pressing plate, a lead screw, a nut seat, an interlock rod, and a small crank arm;

[0007] The lead screw respectively penetrates through the crossbeam bracket, the clutch box, the ratchet wheel, and the nut seat; the nut seat is fixed on one side of the lead screw; the clutch box is fixed on the side of the nut seat away from the lead screw; the ratchet wheel is arranged inside the clutch box; the ratchet wheel is fixed on the side of the lead screw close to the clutch box through an expansion pin; the pin is fixed inside the clutch box; the waist hole of the pawl is attached to the pin; the first return torsion spring is arranged between the pawl and the clutch box; the first return torsion spring is attached to the pin; the interlock rod is fixed on the side of the nut seat away from the lead screw; the interlock rod is arranged outside the clutch box; the screw is fixed on the side of the interlock rod close to the clutch box; the waist hole of the interlock plate is attached to the screw; the side of the interlock plate without a hole is attached to the split pin; the hooked side of the pawl is attached to the ratchet wheel; the unhooked side of the pawl is fixedly connected to the split pin; the small crank arm is fixed on the side of the interlock rod away from the nut seat through an expansion pin; the valve pressing plate is fixedly connected to the small crank arm through a slotted hole;

[0008] The first return torsion spring is used to keep the pawl attached to the groove of the ratchet wheel; the ratchet wheel is used to control the rotation state of the lead screw; the valve pressing plate is used to control the rotation state of the interlock rod through the small crank arm; the screw is used to transmit the rotational force of the interlock rod to the ratchet wheel through the interlock plate, the split pin, and the pawl.

[0009] Preferably, the valve pressing plate includes: a second return torsion spring.

[0010] Preferably, the pawl is limited by the split pin.

[0011] Preferably, the pin is fixedly installed by a nut.

[0012] Preferably, the installation method of the screw and the slotted hole on the interlock plate is slot fit installation.

[0013] Preferably, the ratchet wheel rotates synchronously with the lead screw.

[0014] The present utility model discloses the following technical effects:

[0015] The utility model provides a backstop device for a handcart propulsion mechanism of a switch cabinet. By means of a clutch box, a small crank arm, an interlocking rod, an interlocking plate, a screw, an open pin, a ratchet wheel, a first reset torsion spring, and a pawl, the problem of the complex structure of the existing backstop device for the handcart propulsion mechanism of the switch cabinet is solved, and the backstop function of the device is realized by using fewer transmission structures; by means of the ratchet wheel, the pawl, and the first reset torsion spring, the defect that the existing equipment needs the lead screw to work until the ratchet wheel and the pawl contact to achieve backstop is solved, and the backstop function at any position is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a partial view of the backstop device for the propulsion mechanism provided by the embodiment of the present utility model;

[0018] Figure 2 It is a front sectional view of the backstop device for the propulsion mechanism provided by the embodiment of the present utility model;

[0019] Figure 3 It is a projection view of the backstop device for the propulsion mechanism provided by the embodiment of the present utility model;

[0020] Description of the reference numerals:

[0021] 1 - ratchet wheel, 2 - pawl, 3 - first reset torsion spring, 4 - interlocking plate, 5 - screw, 6 - valve pressing plate, 7 - crossbeam bracket, 8 - clutch box, 9 - open pin, 10 - lead screw, 11 - nut seat, 12 - small crank arm, 13 - interlocking rod, 14 - pin. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0023] The purpose of the present utility model is to provide a backstop device for a switch cabinet trolley propulsion mechanism. By means of a clutch box, a small crank arm, an interlock rod, an interlock plate, a screw, a split pin, a ratchet wheel, a first reset torsion spring, and a pawl, it solves the problem of the complex structure of the existing backstop device for the switch cabinet trolley propulsion mechanism, and realizes the backstop function of the device through fewer transmission structures; through the ratchet wheel, the pawl, and the first reset torsion spring, it solves the defect that the existing equipment needs the lead screw to work until the ratchet wheel and the pawl come into contact to achieve backstop, and realizes the backstop function at any position.

[0024] In order to make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 The following is a schematic structural diagram of the backstop device for the switch cabinet trolley propulsion mechanism provided by the embodiment of the present utility model. Figure 2 The following is a front sectional view of the backstop device for the propulsion mechanism provided by the embodiment of the present utility model. Figure 3 The following is a projection view of the backstop device for the propulsion mechanism provided by the embodiment of the present utility model. As Figure 1 、 Figure 2 and Figure 3 shown, the present utility model provides a backstop device for a switch cabinet trolley propulsion mechanism, including: a ratchet wheel 1, a pawl 2, a first reset torsion spring 3, a pin 14, an interlock plate 4, a screw 5, a split pin 9, a clutch box 8, a crossbeam bracket 7, a valve plate 6, a lead screw 10, a nut seat 11, an interlock rod 13, and a small crank arm 12;

[0026] The lead screw 10 respectively penetrates through the crossbeam bracket 7, the clutch box 8, the ratchet wheel 1, and the nut seat 11; the nut seat 11 is fixed on one side of the lead screw 10; the clutch box 8 is fixed on the side of the nut seat 11 away from the lead screw 10; the ratchet wheel 1 is arranged inside the clutch box 8; the ratchet wheel 1 is fixed on the side of the lead screw 10 close to the clutch box 8 through an expansion pin; the pin 14 is fixed inside the clutch box 8; the waist hole of the pawl 2 is attached to the pin 14; the first reset torsion spring 3 is arranged between the pawl 2 and the clutch box 8; the first reset torsion spring 3 is attached to the pin 14; the interlock rod 13 is fixed on the side of the nut seat 11 away from the lead screw 10; the interlock rod 13 is arranged outside the clutch box 8; the screw 5 is fixed on the side of the interlock rod 13 close to the clutch box 8; the waist hole of the interlock plate 4 is attached to the screw 5; the side of the interlock plate 4 without a hole is attached to the split pin 9; the hooked side of the pawl 2 is attached to the ratchet wheel 1; the unhooked side of the pawl 2 is fixedly connected to the split pin 9; the small crank arm 12 is fixed on the side of the interlock rod 13 away from the nut seat 11 through an expansion pin; the valve plate 6 is fixedly connected to the small crank arm 12 through a slotted hole.

[0027] The first return torsion spring 3 is used to keep the pawl 2 attached to the groove of the ratchet wheel 1; the ratchet wheel 1 is used to control the rotation state of the lead screw 10; the valve pressing plate 6 is used to control the rotation state of the interlocking rod 13 through the small crank arm 12; the screw 5 is used to transmit the rotational force of the interlocking rod 13 to the ratchet wheel 1 through the interlocking plate 4, the split pin 9 and the pawl 2.

[0028] Specifically, the valve pressing plate 6 includes: a second return torsion spring.

[0029] Preferably, the pawl 2 is limited by the split pin 9.

[0030] Specifically, the pin 14 is fixedly installed by a nut.

[0031] Optionally, the installation method of the screw 5 and the slot hole on the interlocking plate 4 is slot mouth fitting installation.

[0032] Specifically, the ratchet wheel 1 rotates synchronously with the lead screw 10.

[0033] Furthermore, the anti-retreat process of a handcart propulsion mechanism for a switch cabinet is as follows:

[0034] Determine the motion state of the device;

[0035] When the motion state of the device is the fixed state, keep the valve pressing plate 6, the interlocking plate 4, the interlocking rod 13 and the screw 5 in a static state;

[0036] Use the first return torsion spring 3 to keep the pawl 2 attached to the groove of the ratchet wheel 1, and use the pawl 2 to keep the lead screw 10 in a static state;

[0037] When the motion state of the device is the propulsion state, use the pre-prepared propulsion handle to press down the valve pressing plate 6 and insert the propulsion handle into the operating end of the lead screw 10;

[0038] Transmit the force generated by the downward movement of the valve pressing plate 6 to the pawl 2 through the small crank arm 12, the interlocking rod 13, the screw 5, the interlocking plate 4 and the split pin 9;

[0039] Use the force generated by the downward movement of the valve pressing plate 6 to control the separation of the pawl 2 from the ratchet wheel 1;

[0040] After the pawl 2 is separated from the ratchet wheel 1, use the propulsion handle to adjust the lead screw 10;

[0041] After the adjustment of the lead screw 10 by the propulsion handle is completed, withdraw the propulsion handle;

[0042] Use the second return torsion spring to reset the valve pressing plate 6;

[0043] Use the force generated by the reset of the valve pressing plate 6 by the second return torsion spring to control the reset of the interlocking rod 13;

[0044] The first return torsion spring 3 is used to control the pawl 2 to fit into the groove of the ratchet wheel 1 again.

[0045] Specifically, the screw 10 passes through the crossbeam bracket 7, the clutch box 8, the ratchet 1, and the nut seat 11. The pin 14 is installed on the clutch box 8 and fixed by a nut. The pawl 2 and the first reset torsion spring 3 are sleeved on the pin 14 and limited by the cotter pin 9. The interlocking plate 4 is installed in the hole at the tail end of the pawl 2. The screw 5 on the interlocking rod 13 is installed in cooperation with the waist hole on the interlocking plate 4 as a slot. The small crank arm 12 is fixed to the end of the interlocking rod 13 with an expansion pin and installed in cooperation with the 6 hole slots of the valve pressure plate.

[0046] Furthermore, when the switch cabinet trolley propulsion mechanism is in the test position, the valve pressure plate 6 is in a closed state, the interlock is in a free state, and the screw 5 installed on the interlocking rod remains stationary. The pawl 2 on the clutch box 8 is always tightly fastened to the groove of the ratchet 1 installed on the lead screw 10 under the spring force of the first reset torsion spring 3. At this time, the lead screw 10 is restricted from rotating. When the switch cabinet trolley propulsion mechanism is pushed from the test position to the working position, the propulsion handle presses down the valve pressure plate 6 and inserts the propulsion handle into the operating end of the lead screw 10. At this time, the valve pressure plate 6 drives the small crank arm 12 installed in cooperation with the notch thereof to rotate the interlocking rod 13 clockwise and drives the interlocking plate 4 to move through the screw 5. The interlocking plate 4 drives the pawl 2 on the clutch box 8 to rotate clockwise to disengage from the groove of the ratchet 1, so that the lead screw 10 is unlocked. The propulsion handle is rotated clockwise until it reaches the working position. When the propulsion handle is pulled out, the valve pressure plate 6 is closed under the spring reset force of the propulsion mechanism itself, driving the interlocking rod 13 to reset. At this time, the pawl 2 on the clutch box 8 is buckled into the groove of the ratchet 1 under the action of the reset torsion spring, and the screw 10 is restricted from rotating.

[0047] Specifically, the interlocking plate 4 is installed in the hole at the rear end of the pawl 2 and is limited by the cotter pin 9; the screw 5 on the interlocking rod 13 is installed in a slotted manner with the bar hole on the interlocking plate 4. The valve pressure plate 6 is provided with a bar hole, which is installed in a slotted manner with the small crank arm 12 installed on the interlocking rod 13; when the valve pressure plate 6 is opened, the small crank arm 12 is driven to rotate clockwise.

[0048] The beneficial effects of the utility model are as follows:

[0049] The utility model solves the problem of complex structure of the existing switch cabinet trolley propulsion mechanism anti-retraction device through a clutch box, a small crank arm, an interlocking rod, an interlocking plate, a screw, a cotter pin, a ratchet, a first reset torsion spring and a pawl, and realizes the anti-retraction function of the device through fewer transmission structures; through the ratchet, the pawl and the first reset torsion spring, the defect that the existing equipment needs the screw to work until the ratchet and the pawl contact before it can stop retreating is solved, and the anti-retraction function at any position is realized.

[0050] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0051] In this article, specific examples are used to elaborate on the principles and implementation manners of the present utility model. The descriptions of the above embodiments are only used to help understand the method and its core idea of the present utility model. At the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A backstop device for a handcart propulsion mechanism of a switch cabinet, characterized in that, Comprising: Ratchet, pawl, first return torsion spring, pin, interlock plate, screw, split pin, clutch box, crossbeam bracket, valve pressing plate, lead screw, nut seat, interlock rod, small crank arm; The lead screw respectively penetrates through the crossbeam bracket, the clutch box, the ratchet and the nut seat; the nut seat is fixed on one side of the lead screw; the clutch box is fixed on the side of the nut seat away from the lead screw; the ratchet is arranged in the clutch box; the ratchet is fixed on the side of the lead screw close to the clutch box through an expansion pin; the pin is fixed in the clutch box; the waist hole of the pawl adheres to the pin; the first return torsion spring is arranged between the pawl and the clutch box; the first return torsion spring adheres to the pin; the interlock rod is fixed on the side of the nut seat away from the lead screw; the interlock rod is arranged outside the clutch box; the screw is fixed on the side of the interlock rod close to the clutch box; the waist hole of the interlock plate adheres to the screw; the side of the interlock plate without holes adheres to the split pin; the hooked side of the pawl adheres to the ratchet; the unhooked side of the pawl is fixedly connected to the split pin; the small crank arm is fixed on the side of the interlock rod away from the nut seat through an expansion pin; the valve pressing plate is fixedly connected to the small crank arm through a slotted hole notch; The first return torsion spring is used to keep the pawl attached to the groove of the ratchet; the ratchet is used to control the rotation state of the lead screw; the valve pressing plate is used to control the rotation state of the interlock rod through the small crank arm; the screw is used to transfer the rotational force of the interlock rod to the ratchet through the interlock plate, the split pin and the pawl.

2. The anti-retreat device of a switch cabinet trolley propulsion mechanism according to claim 1, characterized in that, The valve pressing plate includes: a second return torsion spring.

3. The anti-retreat device of a switch cabinet handcart propulsion mechanism according to claim 1, characterized in that, The pawl is limited by the split pin.

4. The anti-retreat device of a switch cabinet handcart propulsion mechanism according to claim 1, characterized in that, The pin is fixedly installed by a nut.

5. The anti-retreat device of a handcart propulsion mechanism for a switch cabinet according to claim 1, characterized in that, The installation method of the screw and the slotted hole on the interlock plate is notch fit installation.

6. The anti-retreat device of the trolley advancing mechanism of the switch cabinet according to claim 1, characterized in that, The ratchet rotates synchronously with the lead screw.

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