A closing limiting device for a circuit breaker

Abstract

The present invention discloses a closing limiting device for a circuit breaker, which includes a tripping device arranged on one side of the circuit breaker to prevent the knife switch from closing. The tripping device includes a receiving box arranged on the side of the circuit breaker and a connecting component arranged on the handle of the knife switch. A pulling component connected to the connecting component is arranged in the receiving box and is used to drive the knife switch to move towards the side away from the closing direction. A through hole communicating with the inside of the receiving box is formed on one side of the receiving box facing the knife switch, and the through hole is located on the side of the knife switch in the tripping direction. The pulling component includes a motor arranged in the receiving box. A wire winding wheel is arranged at one end of the output shaft of the motor away from the motor. A rope is wound around the wire winding wheel, and one end of the rope away from the wire winding wheel passes through the through hole and is connected to the connecting component. A positioning component for preventing the wire winding wheel from rotating is arranged in the receiving box. Through the mutual cooperation of the above structures, the knife switch can be kept in the tripping state and the closing of the knife switch can be prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and particularly relates to a closing limiting device for a circuit breaker. Background Art

[0002] A circuit breaker refers to a switching device that can close, carry, and interrupt the current under normal circuit conditions and can close, carry, and interrupt the current under abnormal circuit conditions within a specified time. Circuit breakers are classified into high-voltage circuit breakers and low-voltage circuit breakers according to their usage scope. The boundary between high and low voltages is relatively blurred. Generally, those above 3 kV are called high-voltage electrical appliances. Circuit breakers can be used to distribute electric energy, start asynchronous motors infrequently, and protect power supply lines and motors, etc. When they encounter serious overload, short circuit, undervoltage and other faults, they can automatically cut off the circuit. Its function is equivalent to the combination of a fuse switch and an over- and under-heat relay, etc., and generally no components need to be changed after breaking the fault current. At present, it has been widely used.

[0003] When the circuit breaker performs some specific operating actions such as a racking-in action, it is necessary to ensure that the circuit breaker is in the open state. At this time, if the circuit breaker is closed, it will damage the mechanism parts and even endanger the life safety of the operator, resulting in major safety accidents. Summary of the Invention

[0004] The main purpose of the present invention is to provide a closing limiting device for a circuit breaker, aiming to solve the technical problem that in the prior art, when the circuit breaker performs specific operations, closing the circuit breaker will be dangerous.

[0005] To achieve the above object, the closing limiting device for a circuit breaker proposed by the present invention includes a tripping device provided on one side of the circuit breaker to prevent the knife switch from closing. The tripping device includes a receiving box provided on the side of the circuit breaker and a connecting component provided on the handle of the knife switch. A pulling component connected to the connecting component is provided in the receiving box to drive the knife switch to move towards the side away from the closing direction. A through hole communicating with the inside of the receiving box is formed on the side of the receiving box facing the knife switch, and the through hole is located on the side of the knife switch in the tripping direction. The pulling component includes a motor provided in the receiving box. A wire reel is provided at the end of the output shaft of the motor away from the motor. A rope is wound around the wire reel, and the end of the rope away from the wire reel passes through the through hole and is connected to the connecting component. A positioning component for preventing the wire reel from rotating is provided in the receiving box.

[0006] Preferably, the positioning component includes support plates symmetrically arranged on one side of the wheel wall of the wire reel. The support plates on the side away from the wire reel are connected by a support rod, and the support rod is fixed to the inner wall of the receiving box. On one side of each support plate close to the wire reel, there is a clamping plate. On the side of the clamping plate close to the support plate, a first sliding rod vertically penetrates the support plate and is connected to a support plate. A first spring is sleeved on the outer wall of the first sliding rod, and the first spring is located between the support plate and the support plate. On the side of the support plate away from the clamping plate, a plurality of vertical tubes are fixed. A second sliding rod is slidably arranged in each vertical tube. One end of the second sliding rod passes through the tube opening of the vertical tube close to the support plate and penetrates the support plate to be connected to a push plate. The push plate is located on the side of the clamping plate close to the support plate. The tube opening of the vertical tube on the side away from the support plate communicates with a guide tube. An elastic plate is slidably arranged in the guide tube. One end of the elastic plate extends out of one tube opening of the guide tube and is connected to the second sliding rod. The other end of the elastic plate extends out of the other tube opening of the guide tube. The end of the second sliding rod away from the first push plate is located in the vertical tube. A pushing component is arranged at the end of the elastic plate away from the second sliding rod for pushing the elastic plate to move. A plurality of positioning parts for restricting the rotation of the wire reel are arranged on the side of the clamping plate away from the support plate.

[0007] Preferably, the pushing component includes a push rod located in the receiving box. One end of the push rod penetrates the box wall of the receiving box and extends to the outside of the receiving box. The other end of the push rod is located in the receiving box. A guide cylinder is sleeved on the outer wall of the end of the push rod located in the receiving box. A connecting plate is arranged at the end of the push rod located in the receiving box. The end of the connecting plate away from the push rod is connected to the end of each elastic plate away from the second sliding rod. A pressing plate is horizontally arranged on the outer wall of the end of the push rod located outside the receiving box. A fixing component for connecting with the receiving box is arranged on the side of the pressing plate away from the push rod. A third sliding rod is vertically arranged on the side of the pressing plate close to the receiving box. The side of the third sliding rod away from the pressing plate penetrates the receiving box and extends into the inner wall of the receiving box and is connected to a limiting plate. A second spring is sleeved on the outer wall of the third sliding rod located outside the receiving box.

[0008] Preferably, the fixing component includes an insertion block arranged on the side of the pressing plate close to the receiving box. A base is arranged on the receiving box. A slot for the insertion block to insert is formed on the base. A first receiving groove is recessed on the side of the insertion block close to the push rod. A clamping block is slidably arranged in the first receiving groove. A second receiving groove for the clamping block to extend into is recessed on the groove wall of the slot. A third spring is arranged on the side of the clamping block close to the bottom of the first receiving groove. The side of the clamping block away from the third spring can extend out of the first receiving groove or be received in the first receiving groove. A threading hole extending to the side of the pressing plate away from the receiving box is formed on one side of the bottom of the first receiving groove. A cable is arranged in the threading hole. One end of the cable is connected to the end of the clamping block close to the third spring. The other end of the cable extends above the pressing plate and is connected to a pull ring.

[0009] Preferably, one end of the clamping block facing away from the third spring forms an inclined surface that slopes towards the pressing plate side.

[0010] Preferably, the connecting component includes two clamping plates for clamping the handle of the knife switch. The two clamping plates are detachably connected by bolts on both sides. One side of any one of the clamping plates facing away from the other clamping plate is connected with a rotating plate. A rotating block is rotatably connected to the rotating plate. A hanging ring is rotatably arranged on the side of the rotating block facing away from the support rod.

[0011] Preferably, one end of the rope facing away from the wire reel is connected to the hanging ring through a tension sensor. The tension sensor is also connected with a controller for controlling the rotation of the motor.

[0012] Preferably, a plurality of first grooves are recessed on the side of the clamping plate facing away from the support plate. Each positioning member includes an insertion rod arranged in each first groove. A fourth spring is arranged at one end of the insertion rod close to the bottom of the first groove. The insertion rod can extend out of the first groove or be received in the first groove. Second grooves for inserting the insertion rod are evenly spaced and recessed on the wheel wall of the wire reel.

[0013] Preferably, the outer diameter of the insertion rod gradually decreases towards the side facing away from the fourth spring.

[0014] Preferably, a limiting sliding groove is recessed in the first groove. A limiting sliding block for extending into the limiting sliding groove is arranged on the outer wall of the insertion rod.

[0015] In the technical solution of the present invention, when it is necessary to keep the knife switch of the circuit breaker in the open state, the knife switch is pulled from the closed state to the open state. The motor drives the wire reel to rotate. The wire reel rotates to wind up the rope, so that the rope tightens the pulling assembly, and further makes the knife switch in the open state. After the rope tightens the pulling assembly, the positioning assembly fixes the wire reel. After the wire reel is fixed, it can prevent the knife switch from closing. Through the mutual cooperation between the above structures, the function of keeping the knife switch in the open state and preventing the knife switch from closing can be realized. The structure of the present invention can be applied to most circuit breakers with knife switches, greatly improving the compatibility of the product. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 1 It is the overall structure schematic diagram of the present invention;

[0018] Figure 2 Schematic structural diagram of the connection component of the present invention;

[0019] Figure 3 Schematic structural diagram of the opening device of the present invention;

[0020] Figure 4 Schematic cross-sectional structural diagram of the opening device of the present invention;

[0021] Figure 5 Schematic structural diagram of the positioning component of the present invention;

[0022] Figure 6 Schematic structural diagram of the guiding cylinder of the present invention;

[0023] Figure 7 Schematic structural diagram of the fixing component of the present invention;

[0024] Figure 8 For the present invention Figure 7 Partial enlarged structural diagram of area A in;

[0025] Figure 9 Schematic structural diagram of the positioning member of the present invention.

[0026] Explanation of the reference numerals in the drawings:

[0027] 1. Circuit breaker; 2. Opening device; 21. Receiving box; 21a. Through hole; 21b. Water outlet hole; 3. Connection component; 31. Clamping plate; 32. Bolt; 33. Rotating plate; 34. Rotating block; 35. Suspension ring; 4. Pulling component; 41. Motor; 42. Wire reel; 42a. Second groove; 43. Rope; 5. Positioning component; 51. Support plate; 52. Support rod; 53. Clamping plate; 53a. First groove; 53b. Limit sliding groove; 54. Pushing plate; 55. Second sliding rod; 56. Vertical pipe; 57. First sliding rod; 58. First spring; 59. Support plate; 511. Guide pipe; 512. Elastic plate; 513. Guiding cylinder; 514. Connecting plate; 515. Push rod; 516. Third sliding rod; 517. Second spring; 518. Limit plate; 519. Pressing plate; 520. Insert block; 520a. First receiving groove; 521. Block; 522. Base; 522a. Slot; 522b. Second receiving groove; 523. Pulling ring; 524. Third spring; 525. Cable; 526. Insert rod; 527. Fourth spring; 528. Limit slider; 6. Knife switch.

[0028] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0031] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0034] The present invention provides a closing limiting device for a circuit breaker.

[0035] Please refer to Figures 1 to 9The circuit breaker 11 uses a closing restriction device, including an opening device 2 arranged on one side of the circuit breaker 1 to prevent the knife 6 from closing. The opening device 2 includes a storage box 21 arranged on the side of the circuit breaker 1 and a connecting component 3 arranged on the handle of the knife 6. A pulling component 4 connected to the connecting component 3 is provided in the storage box 21 for driving the knife 6 to move toward a side away from the closing direction. A through hole 21a connected to the inside of the storage box 21 is formed on the side of the storage box 21 facing the knife 6. The through hole 21a is located on the side of the opening direction of the knife 6. The pulling component 4 includes a motor 41 arranged in the storage box 21. A winding wheel 42 is provided at the end of the output shaft of the motor 41 away from the motor 41. A rope 43 is wound on the winding wheel 42. The end of the rope 43 away from the winding wheel 42 passes through the through hole 21a and is connected to the connecting component 3. A positioning component 5 for preventing the winding wheel 42 from rotating is provided in the storage box 21.

[0036] In the technical solution of the present invention, when the knife 6 of the circuit breaker 1 needs to be kept in the open state, the knife 6 is pulled from the closed state to the open state, and the motor 41 drives the winding wheel 42 to rotate. The winding wheel 42 rotates to reel in the rope 43, so that the rope 43 tightens the pulling component 4, and further puts the knife 6 in the open state. After the rope 43 tightens the pulling component 4, the positioning component 5 fixes the winding wheel 42. After the winding wheel 42 is fixed, the knife 6 can be prevented from closing. Through the mutual cooperation between the above-mentioned structures, the knife 6 can be kept in the open state and the closing of the knife 6 can be prevented. The structure of the present invention can be applicable to most circuit breakers 1 with knife 6, which greatly improves the compatibility of the product.

[0037] Please refer to the attached Figures 4 - 5, the positioning component 5 includes support plates 51 symmetrically arranged on one side of the wheel wall of the wire reel 42. The support plates 51 on the side facing away from the wire reel 42 are connected by support rods 52, and the support rods 52 are fixed to the inner wall of the receiving box 21. On one side of each support plate 51 close to the wire reel 42, there is a clamping plate 53. On the side of the clamping plate 53 close to the support plate 51, a first sliding rod 57 vertically penetrates through the support plate 51 and is connected to a support plate 59. A first spring 58 is sleeved on the outer wall of the first sliding rod 57, and the first spring 58 is located between the support plate 51 and the support plate 59. On the side of the support plate 51 facing away from the clamping plate 53, a plurality of vertical tubes 56 are fixed. In each vertical tube 56, a second sliding rod 55 is slidably arranged. One end of the second sliding rod 55 passes through the pipe orifice at one end of the vertical tube 56 close to the support plate 51 and penetrates through the support plate 51 to be connected to a push plate 54. The push plate 54 is located on the side of the clamping plate 53 close to the support plate 51; the pipe orifice at the end of the vertical tube 56 facing away from the support plate 51 is communicated with a guide tube 511. An elastic plate 512 is slidably arranged in the guide tube 511. One end of the elastic plate 512 extends out of one pipe orifice of the guide tube 511 and is connected to the second sliding rod 55. The other end of the elastic plate 512 extends out of the other pipe orifice of the guide tube 511. The end of the second sliding rod 55 facing away from the first push plate 54 is located in the vertical tube 56; a pushing component for pushing the elastic plate 512 to move is arranged at the end of the elastic plate 512 facing away from the second sliding rod 55. A plurality of positioning parts for restricting the rotation of the wire reel 42 are arranged on the side of the clamping plate 53 facing away from the support plate 51. When it is necessary to fix the wire reel 42 (for example, when the rope 43 pulls the knife gate 6 to trip and the knife gate 6 needs to be kept in the tripped state), by pressing the pushing component, the elastic plate 512 is pushed to move towards the side close to the second sliding rod 55, so that the second sliding rod 55 pushes the clamping plate 53 to move towards the side close to the clamping plate 53, so that the second sliding rod 55 pushes the clamping plate 53 to move towards the side close to the wire reel 42, so that the clamping plate 53 fixes the wire reel 42 through the positioning parts, so as to achieve the effect of fixing the wire reel 42. Fixing the wire reel 42 is used to prevent the wire reel 42 from reversing and causing the rope 43 to loosen. When the pushing component is released, under the action of the first spring 58, the clamping plate 53 is driven to move towards the side close to the support plate 51, and further the wire reel 42 moves away from the wire reel 42.

[0038] Please refer to the appendix Figures 3 - 6, the pushing component includes a push rod 515 located inside the receiving box 21. One end of the push rod 515 penetrates through the box wall of the receiving box 21 and extends to the outside of the receiving box 21. The other end of the push rod 515 is located inside the receiving box 21. A guiding cylinder 513 is sleeved on the outer wall of the end of the push rod 515 located inside the receiving box 21. A connecting plate 514 is provided at the end of the push rod 515 located inside the receiving box 21. One end of the connecting plate 514 facing away from the push rod 515 is connected to one end of each elastic plate 512 facing away from the second sliding rod 55. A pressing plate 519 is horizontally provided on the outer wall of the end of the push rod 515 located outside the receiving box 21. A fixing component for connecting with the receiving box 21 is provided on one side of the pressing plate 519 facing away from the push rod 515. A third sliding rod 516 is vertically provided on one side of the pressing plate 519 close to the receiving box 21. The side of the third sliding rod 516 facing away from the pressing plate 519 penetrates through the receiving box 21 and extends into the inner wall of the receiving box 21 and is connected to a limiting plate 518. A second spring 517 is sleeved on the outer wall of the third sliding rod 516 located outside the receiving box 21. By pressing the pressing plate 519 towards the side close to the receiving box 21, the push rod 515 is pushed to drive the connecting plate 514 to move towards the side away from the push rod 515. Further, the connecting plate 514 drives the elastic plate 512 to move towards the side close to the vertical pipe 56, so that the pressing plate 519 is connected to the receiving box 21 through the fixing component. After the pressing plate 519 is connected to the receiving box 21, the clamping plate 53 is just fixed to the wire reel 42. When it is necessary to move the clamping plate 53 away from the wire reel 42, the pressing plate 519 is separated from the receiving box 21 through the fixing component. The second spring 517 releases elastic potential energy and drives the pressing plate 519 to move towards the side away from the receiving box 21. Further, the pressing plate 519 drives the push rod 515 to move together, so that the connecting plate 514 drives the elastic plate 512 to move towards the side away from the vertical pipe 56.

[0039] Please refer to the attached Figures 7 - 8The fixing assembly includes an insert block 520 disposed on the side of the pressing plate 519 close to the receiving box 21, the receiving box 21 is provided with a base 522, the base 522 is formed with a slot 522a for inserting the insert block 520, the insert block 520 is recessed on the side close to the push rod 515 to form a first receiving groove 520a, a card block 521 is slidably provided in the first receiving groove 520a, a second receiving groove 522b for the card block 521 to extend into is recessed on the groove wall of the slot 522a, the card block 521 is close to the first receiving groove 5 A third spring 524 is provided on one side of the bottom of the groove 20a, and the side of the clamping block 521 facing away from the third spring 524 can extend out of the first receiving groove 520a or be received in the first receiving groove 520a, and a threading hole extending to the side of the pressing plate 519 facing away from the receiving box 21 is formed on one side of the bottom of the first receiving groove 520a, and a pull rope 525 is provided in the threading hole, and one end of the pull rope 525 is connected to one end of the clamping block 521 close to the third spring 524, and the other end of the pull rope 525 extends above the pressing plate 519 and is connected to the pull ring 523. By pressing the pressing plate 519, the inserting block 520 on the pressing plate 519 moves toward the side close to the receiving box 21, so that the inserting block 520 is inserted into the slot 522a on the base 522. During the process of inserting the inserting block 520 into the slot 522a, the pull ring 523 is pulled so that the pull ring 523 drives the clamping block 521 to be accommodated in the first receiving groove 520a through the pull rope 525. After the end of the clamping block 521 away from the third spring 524 enters the slot 522a, the pull ring 523 is released. After the clamping block 521 is located in the notch range of the second receiving groove 522b, the clamping block 521 loses contact with the slot 520a. 2a groove wall resistance, the third spring 524 drives the card block 521 to move toward the side close to the second receiving groove 522b, so that the end of the card block 521 away from the third spring 524 is received in the second receiving groove 522b, realizing the function of fixing the pressing plate 519. When disassembling, by pulling the pull ring 523, the cable 525 drives the card block 521 to move toward the side close to the first receiving groove 520a and be received in the first receiving groove 520a, and further, the second spring 517 drives the pressing plate 519 to move toward the side away from the receiving box 21, so that the plug 520 pushes the slot 522a.

[0040] Please refer to the attached Figure 7 The end of the block 521 away from the third spring 524 is formed with an inclined surface inclined toward the side close to the pressing plate 519. The inclined surface can make the block 521 contact the groove wall of the slot 522a, and while the pressing plate 519 continues to apply downward pressure, the block 521 retracts toward the side close to the third spring 524 into the first receiving groove 520a.

[0041] Please refer to the attached Figure 2, the connecting component 3 includes two clamping plates 31 for clamping the handle of the knife blade 6 therein. The two clamping plates 31 are detachably connected by bolts 32 on both sides. On one side of any one of the clamping plates 31 facing away from the other clamping plate 31, a rotating plate 33 is connected. A rotating block 34 is rotatably connected to the rotating plate 33, and a hanging ring 35 is rotatably provided on the side of the rotating block 34 facing away from the support rod 52. By clamping and fixing the knife blade 6 with the two clamping plates 31, the present invention can be connected to most circuit breakers 1 with a knife blade 6.

[0042] Please refer to the attached Figure 1 , one end of the rope 43 facing away from the wire reel 42 is connected to the hanging ring 35 through a tension sensor, and the tension sensor is also connected to a controller for controlling the rotation of the motor 41. The tension sensor and the motor 41 are electrically connected to the controller respectively. The tension sensor transmits a signal to the controller. When the tension sensor detects that the tension between the rope 43 and the hanging ring 35 exceeds a preset value, the controller controls the motor 41 to stop working, so that the cable 525 pulls the knife blade 6 to the open position.

[0043] Please refer to the attached Figure 5 , on the side of the clamping plate 53 facing away from the support plate 51, a plurality of first grooves 53a are recessed. Each positioning member includes an insertion rod 526 arranged in each first groove 53a. A fourth spring 527 is provided at one end of the insertion rod 526 close to the bottom of the first groove 53a. The insertion rod 526 can extend out of the first groove 53a or be received in the first groove 53a. Second grooves 42a for inserting the insertion rod 526 are formed by evenly spaced depressions on the wheel wall of the wire reel 42. When the clamping plate 53 approaches the wire reel 42, a plurality of positioning members can make any one or a plurality of insertion rods 526 inserted into the second grooves 42a, and the insertion rods 526 that are not inserted into the second grooves 42a can retract into the first grooves 53a.

[0044] Please refer to the attached Figure 9 , the outer diameter of the insertion rod 526 gradually decreases towards the side facing away from the fourth spring 527, and the gradually decreasing insertion rod 526 can facilitate the insertion of the insertion rod 526 into the second groove 42a.

[0045] Please refer to the attached Figure 9 , a limiting chute 53b is recessed in the first groove 53a, and a limiting slider 528 for extending into the limiting chute 53b is provided on the outer wall of the insertion rod 526. Through the mutual cooperation between the limiting chute 53b and the limiting slider 528, the function of preventing the insertion rod 526 from detaching from the second groove 42a can be achieved.

[0046] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A closing limiting device for a circuit breaker, characterized in that, Including a tripping device provided on one side of the circuit breaker to prevent the knife switch from closing. The tripping device includes a receiving box provided on the side of the circuit breaker and a connecting component provided on the handle of the knife switch. A pulling component connected to the connecting component is provided in the receiving box to drive the knife switch to move towards the side away from the closing direction. A through hole communicating with the inside of the receiving box is formed on the side of the receiving box facing the knife switch. The through hole is located on the side of the knife switch tripping direction. The pulling component includes a motor provided in the receiving box. A wire reel is provided at the end of the output shaft of the motor away from the motor. A rope is wound around the wire reel. One end of the rope away from the wire reel passes through the through hole and is connected to the connecting component. A positioning component for preventing the wire reel from rotating is provided in the receiving box; the positioning component includes support plates symmetrically provided on one side of the wheel wall of the wire reel. The support plates on the side away from the wire reel are connected by support rods, and the support rods are fixed to the inner wall of the receiving box. A clamping plate is provided on one side of each support plate close to the wire reel. One side of the clamping plate close to the support plate is vertically penetrated through the support plate by a first sliding rod and connected to a support plate. A first spring is sleeved on the outer wall of the first sliding rod. The first spring is located between the support plate and the support plate. A plurality of vertical tubes are fixed on the side of the support plate away from the clamping plate. A second sliding rod is slidably provided in each vertical tube. One end of the second sliding rod passes through the tube orifice of the vertical tube close to the support plate and penetrates through the support plate and is connected to a push plate. The push plate is located on the side of the clamping plate close to the support plate; the tube orifice of the vertical tube away from the support plate communicates with a guide tube. An elastic plate is slidably provided in the guide tube. One end of the elastic plate extends out of one tube orifice of the guide tube and is connected to the second sliding rod. The other end of the elastic plate extends out of the other tube orifice of the guide tube. The end of the second sliding rod away from the first push plate is located in the vertical tube; a pushing component for pushing the elastic plate to move is provided at the end of the elastic plate away from the second sliding rod. A plurality of positioning members for restricting the rotation of the wire reel are provided on the side of the clamping plate away from the support plate.

2. The closing limiting device for a circuit breaker according to claim 1, wherein The pushing component includes a push rod located in the receiving box. One end of the push rod penetrates through the box wall of the receiving box and extends to the outside of the receiving box. The other end of the push rod is located in the receiving box. A guide tube is sleeved on the outer wall of the end of the push rod located in the receiving box. A connecting plate is provided at the end of the push rod located in the receiving box. One end of the connecting plate away from the push rod is connected to one end of each elastic plate away from the second sliding rod. A pressing plate is horizontally provided on the outer wall of the end of the push rod located outside the receiving box. A fixing component for connecting to the receiving box is provided on the side of the pressing plate away from the push rod. A third sliding rod is vertically provided on the side of the pressing plate close to the receiving box. The side of the third sliding rod away from the pressing plate penetrates through the receiving box and extends into the inner wall of the receiving box and is connected to a limiting plate. A second spring is sleeved on the outer wall of the third sliding rod located outside the receiving box.

3. The closing limiting device for a circuit breaker according to claim 2, characterized in that, The fixed component includes an insertion block disposed on the side of the pressing plate close to the receiving box. A base is provided on the receiving box, and a slot for the insertion block to insert into is formed on the base. A first receiving groove is recessed on the side of the insertion block close to the push rod. A clamping block is slidably disposed in the first receiving groove. A second receiving groove for the clamping block to extend into is recessed on the inner wall of the slot. A third spring is provided on the side of the clamping block close to the bottom of the first receiving groove. The side of the clamping block facing away from the third spring can extend out of the first receiving groove or be received in the first receiving groove. A threading hole extending to the side of the pressing plate facing away from the receiving box is formed on one side of the bottom of the first receiving groove. A cable is disposed in the threading hole. One end of the cable is connected to the end of the clamping block close to the third spring, and the other end of the cable extends above the pressing plate and is connected to a pull ring.

4. The closing limiting device for a circuit breaker according to claim 3, characterized in that, The end of the clamping block facing away from the third spring forms an inclined surface that slopes towards the side close to the pressing plate.

5. The closing limiting device for a circuit breaker according to claim 1, characterized in that, The connection component includes two clamping plates for clamping the handle of the switchblade. The two clamping plates are detachably connected by bolts on both sides. A rotating plate is connected to the side of any one of the clamping plates facing away from the other clamping plate. A rotating block is rotatably connected to the rotating plate. A hanging ring is rotatably disposed on the side of the rotating block facing away from the support rod.

6. The closing limiting device for a circuit breaker according to claim 5, characterized in that, One end of the rope facing away from the wire reel is connected to the hanging ring through a tension sensor. The tension sensor is further connected to a controller for controlling the rotation of the motor.

7. The closing limiting device for a circuit breaker according to claim 1, characterized in that, A plurality of first grooves are recessed on the side of the clamping plate facing away from the support plate. Each positioning member includes an insertion rod disposed in each first groove. A fourth spring is provided at the end of the insertion rod close to the bottom of the first groove. The insertion rod can extend out of the first groove or be received in the first groove. Second grooves for the insertion rod to insert into are evenly spaced and recessed on the wheel wall of the wire reel.

8. The closing limiting device for a circuit breaker according to claim 7, wherein, The outer diameter of the insertion rod gradually decreases towards the side facing away from the fourth spring.

9. The closing limiting device for a circuit breaker according to claim 7, characterized in that, A limiting sliding groove is recessed in the first groove. A limiting sliding block for extending into the limiting sliding groove is provided on the outer wall of the insertion rod.

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