Handcart type circuit breaker transfer trolley
By designing positioning units and lifting components that are compatible with circuit breakers of different specifications, the limitations of existing transfer trolley positioning and inconvenience of maintenance have been solved, enabling stable transfer of circuit breakers and convenient bottom maintenance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-05
- Publication Date
- 2026-04-07
AI Technical Summary
The positioning pins of existing handcart-type circuit breaker transfer trolleys can only position circuit breakers of specific specifications, resulting in poor versatility. Furthermore, it is impossible to directly inspect or repair the bottom structure of the circuit breaker on the transfer trolley, making the operation cumbersome.
The design includes a transfer trolley consisting of a car body, a carrying platform, a lifting mechanism, a positioning unit, and a lifting assembly. The positioning unit uses clamping plates, a shim assembly, and wheel sleeves to stably fix circuit breakers of different widths and wheelbases. The lifting assembly allows the circuit breaker to be flipped over for easy bottom inspection and maintenance.
The versatility and stability of the transfer trolley have been improved, the operation process has been simplified, and the bottom structure of the circuit breaker can be directly inspected and repaired during the transfer process, thereby improving work efficiency.
Smart Images
Figure CN121799484A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of transfer device technology, specifically a handcart-type circuit breaker transfer trolley. Background Technology
[0002] Handcart-type circuit breakers require a transfer trolley for transportation, installation, and dismantling. The main structure of the transfer trolley includes a frame, a lifting mechanism, and a carrying platform. The frame is welded from high-strength steel and has a combination of casters and directional wheels at the bottom for flexible movement and stable steering. The lifting mechanism uses a mechanical screw lifting device to adjust the height of the carrying platform for easy alignment with the circuit breaker installation position. The carrying platform has a flat surface and is equipped with positioning pins to prevent the circuit breaker from slipping during transportation.
[0003] During transport operations, the transport trolley is pushed under the circuit breaker. The height of the support platform is adjusted using the lifting mechanism to ensure it contacts and supports the circuit breaker base. The circuit breaker is then securely fixed to the support platform using positioning pins. Operators control the trolley's movement using push-pull handles and utilize the caster system for forward movement, steering, and fine-tuning until the target position is reached. During maintenance operations, the transport trolley is pushed close to the power cabinet. The height of the support platform is adjusted using the lifting mechanism to ensure it is level with the circuit breaker base. The circuit breaker is unlocked from the power cabinet and pulled onto the support platform. It is then securely fixed to the support platform using positioning pins. The circuit breaker is then transported to the maintenance workshop for inspection or maintenance using the transport trolley. If inspection or maintenance of the bottom of the circuit breaker is required, the circuit breaker must be lifted from the transport trolley using a lifting device to expose its bottom.
[0004] The shortcomings of existing handcart-type circuit breaker transfer trolleys are as follows: First, the positioning method of the positioning pin is only compatible with a narrow range of handcart-type circuit breakers, resulting in poor versatility and difficulty in meeting the positioning requirements of different specifications of circuit breakers. Furthermore, the positioning pin cannot be adapted to circuit breakers with different front and rear wheel axle distances, and can only position circuit breakers of specific specifications, which has certain limitations. Second, the transfer trolley can only realize the transfer and lifting of circuit breakers, and it is not possible to directly inspect or repair the bottom structure of the circuit breaker on the transfer trolley. Specific lifting tools are required to lift the circuit breaker, making the operation relatively cumbersome. Summary of the Invention
[0005] The purpose of this invention is to provide a handcart-type circuit breaker transfer trolley to solve the problem that the positioning pins of the transfer trolley in the prior art can only position circuit breakers of a specific specification and the bottom structure of the circuit breaker cannot be directly inspected or repaired on the transfer trolley.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a trolley for transporting handcart-type circuit breakers, comprising a car body and a carrying platform connected to the car body via a lifting mechanism. Two positioning units are symmetrically arranged on the carrying platform, each positioning unit comprising: a clamping plate, which is slidably connected to the carrying platform in the left-right direction; a shim assembly, comprising a moving block and a pad, the moving block being slidably connected to the clamping plate in the front-rear direction and subjected to a rearward elastic force, the pad being slidably connected to the moving block in the vertical direction and subjected to an upward elastic force, one end of the pad having a wheel groove for engaging the front wheel of the handcart-type circuit breaker, the side of the wheel groove away from the pad having a limiting structure for blocking the front wheel, the pad engaging with the clamping plate under load via a toothed groove structure; and a lifting assembly, comprising a wheel sleeve slidably connected to the clamping plate in the vertical direction, the wheel sleeve being used to engage the rear wheel of the handcart-type circuit breaker.
[0007] Furthermore, the limiting structure includes a slide that is vertically movable on one side of the wheel groove, and a limiting roller and a pressure roller are rotatably connected on the slide. The pressure roller is located in front of the limiting roller and below the limiting roller.
[0008] Furthermore, a first spring rod arranged in the front-to-back direction is fixedly connected to the clamping plate, and the rear end of the first spring rod is connected to the moving block.
[0009] Furthermore, a guide rod is fixedly connected to the pad, the moving block slides through the guide rod, and a compression spring is sleeved on the guide rod. The bottom of the compression spring abuts against the moving block, and the top abuts against the limiting nut screwed onto the guide rod.
[0010] Furthermore, the toothed structure includes a row of teeth and a row of grooves, one of which is located on the upper surface of the clamping plate and the other is located on the lower surface of the pad.
[0011] Furthermore, the lifting assembly also includes a top rod fixedly connected to the bottom of the wheel sleeve, the top rod being provided with vertical driving force by the drive assembly.
[0012] Furthermore, the bearing platform is provided with a through groove for avoiding the top rod, and a sliding plate is slidably connected in the through groove along the length direction. The sliding plate is subjected to the elastic force of the top rod, and the upper surface of the sliding plate is flush with the bearing platform.
[0013] Furthermore, the two positioning units share a driving assembly, which includes a bidirectional telescopic rod, a second screw, and a rotating rod. The two telescopic ends of the bidirectional telescopic rod are each fixedly connected to a top rod. The second screw is arranged vertically, rotatably connected to the bearing platform, and threadedly connected to the middle of the bidirectional telescopic rod. The rotating rod is arranged front and rear, rotatably connected to the bearing platform, and driven by the second screw through a bevel gear set.
[0014] Furthermore, the bottom of the bearing platform is rotatably connected to a first screw arranged on the left and right. The first screw has two threaded sections with opposite directions of rotation. The bottom of the clamping plates of the two positioning units are respectively fixedly connected to a first screw sleeve, and each of the two first screw sleeves is threadedly connected to a threaded section.
[0015] Furthermore, the lifting mechanism is a scissor lift mechanism.
[0016] Compared with existing technologies, the handcart-type circuit breaker transfer trolley provided by this invention features clamping plates in two positioning units that can slide and close in the left-right direction, adapting to handcart-type circuit breakers of different widths and significantly improving the versatility of the device. The moving block in the elevation assembly slides in the front-back direction and is subjected to a backward elastic force, automatically adapting to circuit breakers within a certain wheelbase range without manual adjustment, resulting in stronger adaptability and greater ease of use. The clamping action of the clamping plates, combined with the limiting structure and wheel sleeves, provides a more stable fixation of the circuit breaker, preventing... The system eliminates slippage during transport, improving stability and safety. After the circuit breaker is positioned on the carrying platform, the front wheels enter the wheel grooves and the circuit breaker's own weight presses down on the pad, causing the pad to slide relative to the moving block. The pad and clamping plate are locked together in the front-to-back direction by a toothed structure. Subsequently, the lifting assembly raises the rear wheels, allowing the front wheels to climb onto the pad, thus elevating the front wheels and enabling the circuit breaker to be smoothly rotated at a certain angle. This allows for bottom inspection and maintenance without the need for lifting equipment, simplifying the operation process and improving work efficiency. Attached Figure Description
[0017] To provide a clearer description of the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the embodiments will be briefly introduced below.
[0018] Figure 1 A schematic diagram of the overall structure provided for the embodiment; Figure 2 A schematic diagram of the connection structure of the lifting mechanism, the carrying platform and the positioning unit provided in the embodiment; Figure 3 A schematic diagram of the connection structure of the lifting mechanism, the carrying platform, the positioning unit, and the drive assembly provided in the embodiment; Figure 4 A schematic diagram of the connection structure of the support platform, positioning unit and driving component provided in the embodiment; Figure 5 A schematic diagram of the positioning unit provided in the embodiment; Figure 6 A schematic diagram of the structure of the jacking component provided in the embodiment; Figure 7 A schematic diagram of the toothed structure when the toothed structure is separated, as provided in the embodiment; Figure 8This is a schematic diagram of the toothed groove structure when engaged, as provided in the embodiment. Figure 9 This is a schematic diagram of the structure of the handcart-type circuit breaker when it is placed flat on the support platform, as provided in the embodiment. Figure I ; Figure 10 This is a schematic diagram of the structure of the handcart-type circuit breaker when it is placed flat on the support platform, as provided in the embodiment. Figure II ; Figure 11 This is a schematic diagram of the structure of a handcart-type circuit breaker placed obliquely on a support platform, as provided in an embodiment.
[0019] Explanation of reference numerals in the attached figures: 1. Car body; 2. Lifting mechanism; 3. Bearing platform; 4. Positioning unit; 41. Clamping plate; 42. Slide rail; 43. Moving block; 44. First spring rod; 45. Pad plate; 46. Guide rod; 47. Compression spring; 48. Wheel groove; 49. Limiting structure; 491. Slide frame; 492. Slide track; 493. Limiting roller; 494. Pressure roller; 410. Toothed structure; 411. Wheel sleeve; 412. Top rod; 413. Through groove; 414. Slide plate; 415. Second spring rod; 5. Drive assembly; 51. Bidirectional telescopic rod; 52. Second screw; 53. Second screw sleeve; 54. Rotating rod; 55. Bearing; 56. Bevel gear set; 6. First screw; 7. First screw sleeve. Detailed Implementation
[0020] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.
[0021] Please see Figures 1-11 The handcart-type circuit breaker transfer trolley provided in this embodiment of the invention includes a lifting structure for the trolley body 1, a carrying platform 3, and two positioning units 4 arranged symmetrically on the left and right. The trolley body 1 is preferably a cabinet-type trolley body 1. The carrying platform 3 is connected to the top of the trolley body 1 through a lifting mechanism 2 and is used to carry the handcart-type circuit breaker (hereinafter referred to as the circuit breaker). The lifting mechanism 2 is preferably a scissor-type lifting mechanism.
[0022] Two positioning units 4 are mounted on the support platform 3 and have identical structures. Each positioning unit 4 includes a clamping plate 41, a shim assembly, and a lifting assembly. The clamping plate 41 and the support platform 3 are slidably connected by a sliding structure, allowing the clamping plate 41 to slide on the upper surface of the support platform 3 in the left-right direction. The sliding structure can be a combination of a groove and a slider. For example, the support platform 3 is provided with a horizontally arranged groove, and the clamping plate 41 is provided with a slider placed in the groove.
[0023] The shim assembly includes a movable block 43 and a pad 45 that cooperate with each other. A slide rail 42 is provided on the clamping plate 41 along the front-to-back direction. The movable block 43 is slidably connected to the slide rail 42 along the front-to-back direction. A first spring rod 44 is fixedly connected to the clamping plate 41 along the front-to-back direction. The rear end of the first spring rod 44 is connected to the movable block 43, so that the movable block 43 is subjected to a backward elastic force. When the movable block 43 moves forward, it compresses the first spring rod 44, allowing the first spring rod 44 to further store energy. The pad 45 is slidably connected to the movable block 43 along the vertical direction. A vertically arranged guide rod 46 is fixedly connected to the pad 45. The movable block 43 slides through the guide rod 46. A compression spring 47 is sleeved on the guide rod 46. The bottom of the compression spring 47 abuts against the movable block 43, and the top abuts against a limiting nut screwed onto the guide rod 46, so that the pad 45 is subjected to an upward elastic force. When the pad 45 moves downward, it compresses the compression spring 47, allowing the compression spring 47 to further store energy.
[0024] One end of the pad 45 has a wheel groove 48. The bottom of the wheel groove 48 portion of the pad 45 should always be no lower than the upper surface of the bearing platform 3. The axial direction of the wheel groove 48 is left-right. The wheel groove 48 is used to engage the front wheel of the circuit breaker when the positioning unit 4 moves towards the center of the bearing platform 3. The wheel groove 48 is adapted to the front wheel of the circuit breaker. The wheel groove 48 is a semi-circular or slightly curved shape with an open upper part. The inner opening of the wheel groove 48 is chamfered to be flared so that the positioning unit 4 can guide the front wheel of the circuit breaker into the wheel groove 48 when it approaches the circuit breaker.
[0025] A toothed structure 410 is provided between the pad 45 and the clamping plate 41. The toothed structure 410 includes a row of teeth and a row of grooves. One of the rows of teeth and the row of grooves is located on the upper surface of the clamping plate 41, and the other is located on the lower surface of the pad 45. When the pad 45 is unloaded, the elastic force of the compression spring 47 causes the pad 45 to move upward and align with the moving block 43. There is a gap (approximately 1-2 mm) between the pad 45 and the clamping plate 41. The rows of teeth and the row of grooves in the toothed structure 410 are separated. In this state, the shim assembly can move as a whole along the slide rail 42. When the pad 45 is under load, the compression spring 47 is further compressed and stores energy, and the pad 45 is pressed against the surface of the clamping plate 41. The teeth and grooves of the toothed structure 410 are engaged together. In this state, the pad 45 and the clamping plate 41 are locked in the front-back direction, and the padding component cannot move along the slide rail 42. Moreover, in this state, the bottom of the circle where the wheel groove 48 is located is tangent to the upper surface of the bearing platform 3.
[0026] A limiting structure 49 is provided on the side of the wheel groove 48 away from the pad 45. When the circuit breaker moves onto the bearing platform 3, the front wheel of the circuit breaker abuts against the limiting structure 49, driving the entire pad assembly to move forward along the guide rail. This allows the wheel groove 48 to automatically adjust the distance between itself and the wheel sleeve 411 according to the wheel distance between the front and rear wheels of the circuit breaker.
[0027] As a preferred technical solution, the limiting structure 49 includes a slide 491, a limiting roller 493, and a pressure roller 494. The slide 491 is vertically movable on one side of the wheel groove 48. The limiting roller 493 and the pressure roller 494 are rotatably connected on the slide 491. The axial directions of the limiting roller 493 and the pressure roller 494 are parallel to the axial direction of the wheel groove 48. The pressure roller 494 is located in front of the limiting roller 493 and lower than the limiting roller 493. The front wheel of the circuit breaker abuts against the limiting roller 493 for a limited position. The limiting roller 493 never contacts the bearing platform 3. The downward pressure exerted by the front wheel on the limiting roller 493 is absorbed by the bearing roller 494 through the slide 491. The bearing roller 494 rolls on the bearing platform 3, so that the front wheel will not exert a downward force on the pad 45 through the limiting structure 49 before entering the wheel groove 48, so that the pad 45 will not move down and cause the toothed structure 410 to engage. The shim assembly can move forward along the guide rail to match the wheelbase of the circuit breaker.
[0028] The lifting assembly includes a wheel sleeve 411 and a lifting rod 412. The lifting rod 412 is fixedly connected to the wheel sleeve 411, and the two are slidably connected to the clamping plate 41 in the vertical direction. Specifically, the lifting rod 412 and the clamping plate 41 are vertically slidably connected and engaged. The lifting rod 412 is provided with vertical driving force by the driving assembly 5. The wheel sleeve 411 is used to engage the rear wheel of the circuit breaker when the positioning unit 4 moves in the middle of the carrying platform 3. The bottom of the wheel sleeve 411 must not be lower than the upper surface of the carrying platform 3. The wheel sleeve 411 is adapted to the rear wheel of the circuit breaker. The inner opening of the wheel sleeve 411 is chamfered and flared so that the positioning unit 4 can guide the rear wheel of the circuit breaker into the wheel sleeve 411 when it approaches the circuit breaker.
[0029] The support platform 3 has a through groove 413 corresponding to the top rod 412. The length direction of the through groove 413 is left and right. When the positioning unit 4 moves towards the middle of the support platform 3, the through groove 413 can avoid the top rod 412. A sliding plate 414 is slidably connected in the through groove 413 along its length direction. The upper surface of the sliding plate 414 is flush with the upper surface of the support platform 3. The length of the sliding plate 414 is shorter than the length of the through groove 413. A second spring rod 415 is provided between the sliding plate 414 and the support platform 3. The second spring rod 415 causes the sliding plate 414 to be subjected to a spring force towards the top rod 412. During the movement of the circuit breaker on the support platform 3, the sliding plate 414 can fill the through groove 413, so that the front and rear wheels of the circuit breaker can maintain smooth rolling when passing through the through groove 413 and avoid bumps. When the positioning unit 4 moves towards the middle of the support platform 3, the top rod 412 will squeeze the sliding plate 414, causing the sliding plate 414 to slide towards the middle of the support platform 3, and the top rod 412 can enter the through groove 413. The cooperation between the through groove 413, the sliding plate 414 and the second spring rod 415 not only solves the problem of interference between the top rod 412 and the bearing platform 3 when it moves left and right, but also solves the problem of bumping when the front and rear wheels of the circuit breaker pass through the through groove 413.
[0030] The top rods 412 of the two positioning units 4 share a single drive assembly 5. The drive assembly 5 includes a bidirectional telescopic rod 51, a second screw 52, and a rotating rod 54, as shown below. Figure 4 As shown. A bidirectional telescopic rod 51 is arranged left and right, with its extension and retraction direction being left and right. Each of the two telescopic ends of the bidirectional telescopic rod 51 is fixedly connected to a top rod 412. When the two top rods 412 slide in the left and right direction, the bidirectional telescopic rod 51 can extend and retract to adapt. A through-hole second threaded sleeve 53 is fixedly connected to the middle of the bidirectional telescopic rod 51. A second screw 52 is arranged vertically, rotatably connected to the support platform 3 via a bearing 55, and threadedly connected to the second threaded sleeve 53. A rotating rod 54 is arranged horizontally front and back, rotatably connected to the support platform 3, and drivenly connected to the second screw 52 via a bevel gear set 56. The bevel gear set 56 includes a first bevel gear coaxially fixedly connected to the rotating rod 54 and a second bevel gear coaxially fixedly connected to the top of the second screw 52. The first bevel gear and the second bevel gear mesh with each other. By rotating the rotating rod 54, the rotating rod 54 drives the second screw 52 to rotate through the bevel gear set 56. The second screw 52 and the second screw sleeve 53 are threaded together, which drives the bidirectional telescopic rod 51 to move upward. The bidirectional telescopic rod 51 drives the two wheel sleeves 411 to rise upward through the two push rods 412, raising the two rear wheels of the circuit breaker and causing the circuit breaker to flip at a preset angle.
[0031] The two positioning units 4 are driven by a structure that moves synchronously in opposite directions along the left-right axis on the support platform 3. The drive structure includes a first screw 6 and two first threaded sleeves 7. The first screw 6 is rotatably connected to the bottom of the support platform 3, with its length direction being left-right. The first screw 6 has two threaded sections with opposite directions of rotation. The two first threaded sleeves 7 are fixedly connected to the bottom of the clamping plates 41 of the two positioning units 4, one-to-one, and each of the two first threaded sleeves 7 is threadedly connected to one of the threaded sections. By rotating the first screw 6, the first screw 6 simultaneously engages with the two first threaded sleeves 7, causing the two first threaded sleeves 7 to close or separate along the first screw 6, thereby causing the two positioning units 4 to close or separate.
[0032] In use, the handcart-type circuit breaker transfer trolley is pushed close to the power cabinet. The height of the supporting platform 3 is adjusted using the lifting mechanism 2 until it is flush with the circuit breaker base. The circuit breaker is then unlocked from the power cabinet and pulled onto the supporting platform 3. When the front wheel of the circuit breaker aligns with the wheel groove 48, it abuts against the limiting roller 493 of the limiting structure 49. The pressure of the front wheel on the limiting roller 493 is transmitted to the supporting platform 3 through the pressure roller. The elastic force of the compression spring 47 raises the pad 45 until there is a gap between it and the clamping plate 41. The toothed structure 410 remains in the separated state. Figure 7 As shown, the front wheel pushes the entire shim assembly forward along the guide rail until the rear wheel of the circuit breaker aligns with the wheel sleeve 411, thereby automatically adapting the spacing between the wheel groove 48 and the wheel sleeve 411 to the wheelbase between the front and rear wheels of the circuit breaker.
[0033] The driving structure drives the two positioning units 4 to move synchronously in opposite directions and close together, so that the two wheel grooves 48 are respectively fitted onto the two front wheels of the circuit breaker, and the two wheel sleeves 411 are respectively fitted onto the two rear wheels of the circuit breaker. The front wheels enter the wheel grooves 48 and the circuit breaker's own weight presses the pad 45, causing the pad 45 to slide down relative to the moving block 43 (during this period, the slide 491 of the limiting structure 49 slides upward relative to the slide rail 492 to counteract the decrease in height between the pad 45 and the wheel grooves 48). The pad 45 and the clamping plate 41 are locked in the front-rear direction by the toothed structure 410, such as Figure 8 As shown, the circuit breaker is positioned on the support platform 3, allowing for its transfer and maintenance. Figures 9-10 As shown.
[0034] The circuit breaker's own weight causes the toothed structure 410 between the pad 45 and the clamping plate 41 to engage, thus locking the pad 45 and the clamping plate 41 in the front-to-back direction. The lifting assembly cannot move forward or backward. By using the drive assembly 5 to lift the wheel sleeve 411, the circuit breaker's rear wheel is raised, allowing the circuit breaker's front wheel to be pulled from the wheel groove 48 onto the pad 45, thereby raising the circuit breaker's front wheel. This ensures that when the circuit breaker rotates around the front wheel, the bottom edge of the front side of the circuit breaker will not interfere with the supporting platform 3, allowing the circuit breaker to smoothly rotate to a preset angle. The preset angle is preferably between 0° and 60°. Figure 11 As shown, the greater the angle at which the circuit breaker flips, the closer the front wheel is to the center of the bearing platform 3, ensuring that the bearing platform 3 is subjected to more even pressure from the circuit breaker and improving stability.
[0035] After the circuit breaker is flipped to a preset angle, the bottom of the circuit breaker can be directly inspected and repaired on the bearing platform 3. The inspection includes checking whether the base bolts, connecting rod joints, and grounding bolts are loose or corroded, whether the gaskets are aged or cracked, and whether there are any traces of gas (SF6), hydraulic oil, or insulating oil leakage. The repair includes checking for gas leakage at the bottom of SF6 circuit breakers by disassembling the sealing interface, replacing the sealing ring, and refilling for leak testing; checking for jammed operating mechanisms of vacuum circuit breakers by disassembling the bottom connecting rod joints and checking for jamming or wear; and checking for oil leakage at the bottom of oil circuit breakers by disassembling the oil release valve, replacing the valve core or sealing gasket, and, if necessary, draining the oil and checking the inside of the oil tank.
[0036] It should be noted that the front, rear, left, and right orientations in the above technical solution are all relative to the vehicle body 1. The circuit breaker is aligned with the front, rear, left, and right orientations of the vehicle body 1. The first screw 6 and the second screw 52 in the above technical solution can be driven to rotate by a hand drill. The drill bit needs to be replaced with a countersunk sleeve, which is then fitted onto the end of the first screw 6 or the second screw 52 to drive its rotation.
[0037] The foregoing description of certain exemplary embodiments of the present invention should not be construed as limiting the scope of protection of the claims. Those skilled in the art will recognize that the described embodiments can be modified in other ways without departing from the spirit and scope of the invention.
Claims
1. A handcart-type circuit breaker transfer trolley, comprising a trolley body and a support platform connected to the trolley body via a lifting mechanism, characterized in that, Two positioning units are symmetrically arranged on the left and right sides of the support platform. Each positioning unit includes: A clamping plate that is slidably connected to the bearing platform in the left-right direction; The shim assembly includes a movable block and a pad. The movable block is slidably connected to the clamping plate in the front-back direction and is subjected to a rearward elastic force. The pad is slidably connected to the movable block in the vertical direction and is subjected to an upward elastic force. One end of the pad has a wheel groove for fitting the front wheel of the handcart-type circuit breaker. The side of the wheel groove away from the pad is provided with a limiting structure to block the front wheel. When the pad is under load, it is engaged with the clamping plate through a toothed structure. The lifting assembly includes a wheel sleeve that is slidably connected to a clamping plate in a vertical direction, the wheel sleeve being used to engage the rear wheel of the trolley circuit breaker.
2. The handcart-type circuit breaker transfer trolley according to claim 1, characterized in that, The limiting structure includes a slide that is vertically movable on one side of the wheel groove. A limiting roller and a pressure roller are rotatably connected on the slide. The pressure roller is located in front of the limiting roller and below the limiting roller.
3. The handcart-type circuit breaker transfer trolley according to claim 1, characterized in that, A first spring rod arranged in the front-to-back direction is fixedly connected to the clamping plate, and the rear end of the first spring rod is connected to the moving block.
4. The handcart-type circuit breaker transfer trolley according to claim 1, characterized in that, A guide rod is fixedly connected to the pad, and a movable block slides through the guide rod. A compression spring is sleeved on the guide rod, with the bottom of the compression spring abutting against the movable block and the top abutting against a limiting nut screwed onto the guide rod.
5. The handcart-type circuit breaker transfer trolley according to claim 1, characterized in that, The toothed structure includes a row of teeth and a row of grooves, one of which is located on the upper surface of the clamping plate and the other is located on the lower surface of the pad plate.
6. The handcart-type circuit breaker transfer trolley according to claim 1, characterized in that, The lifting assembly also includes a top rod fixedly connected to the bottom of the wheel sleeve, the top rod being provided with vertical driving force by the drive assembly.
7. The handcart-type circuit breaker transfer trolley according to claim 6, characterized in that, The bearing platform has a through groove for avoiding the top rod. A sliding plate is slidably connected in the through groove along the length direction. The sliding plate is subjected to the elastic force of the top rod, and the upper surface of the sliding plate is flush with the bearing platform.
8. The handcart-type circuit breaker transfer trolley according to claim 6, characterized in that, The two positioning units share a driving assembly, which includes a bidirectional telescopic rod, a second screw, and a rotating rod. The two telescopic ends of the bidirectional telescopic rod are each fixedly connected to a top rod. The second screw is arranged vertically, rotatably connected to the bearing platform, and threadedly connected to the middle of the bidirectional telescopic rod. The rotating rod is arranged front and rear, rotatably connected to the bearing platform, and driven by the second screw through a bevel gear set.
9. The handcart-type circuit breaker transfer trolley according to claim 1, characterized in that, The bottom of the bearing platform is rotatably connected to a first screw arranged on the left and right. The first screw has two threaded sections with opposite directions of rotation. The bottom of the clamping plates of the two positioning units are respectively fixedly connected to a first screw sleeve, and each of the two first screw sleeves is threadedly connected to a threaded section.
10. The handcart-type circuit breaker transfer trolley according to claim 1, characterized in that, The lifting mechanism is a scissor lift mechanism.