2-degree-of-freedom adjustable circuit breaker transfer trolley

Abstract

The application discloses a 2-degree-of-freedom adjustable circuit breaker transfer trolley, which comprises a main frame, wherein the main frame comprises a rear support, a left supporting arm and a right supporting arm; a plurality of heavy universal wheels are arranged at the bottom of the rear support; a fixed wheel is arranged at the bottom of each of the left supporting arm and the right supporting arm; two pairs of horizontal distance adjusting mechanisms are symmetrically and fixedly arranged on the rear support; a vertical lifting mechanism and a hand-operated driving mechanism are arranged on the left supporting arm and the right supporting arm respectively; when the hand-operated driving mechanism is manually operated to move, the horizontal distance adjusting mechanism is driven to move, the guide rail supporting table is indirectly and synchronously driven to move up and down, and the up-and-down distance adjustment is realized; the trolley has the advantages of adjustable distance, up-and-down synchronous lifting function, good structure bearing property, strong anti-inclination ability, simple operation, convenient up-and-down goods transfer, and the like, and solves the problems of easy circuit breaker toppling, difficult cabinet transfer, many transfer personnel and many transfer toolings, realizes safe transfer, easily transfers the cabinet, and meets the application requirements of ZN85 different widths and cabinet guide rail heights.

Description

Technical Field

[0001] This invention relates to the field of power equipment machinery, and in particular to a 2-degree-of-freedom adjustable circuit breaker transfer trolley. Background Technology

[0002] In three-phase AC 50Hz, 40.5kV single busbar segmented power systems, KYN61-40.5 armored withdrawable metal-enclosed switchgear is widely used in power plants, substations, industrial and mining enterprises, and high-rise building power distribution systems, occupying a major position among 40.5kV air-insulated equipment. In the domestic power market, the two most commonly used circuit breakers are the domestically produced ZN85-40.5 circuit breaker and ABB's VD4 series circuit breaker. This type of circuit breaker weighs over 400KG and is 1.2 meters high. It is not feasible to use ordinary transport trolleys for transferring the circuit breaker cabinet or to remove it from the cabinet for maintenance, as is the case with miniature circuit breakers.

[0003] To circumvent the above problems, the usual practice is to equip substations with VD series circuit breakers with imported transfer trolleys. These trolleys are only compatible with foreign products and do not support the transfer of the domestically produced ZN85 circuit breakers. Summary of the Invention

[0004] The purpose of this invention is to provide a transfer trolley for the safe transfer of ZN85 circuit breakers of different widths manufactured in China to the KYN61 cabinet. The trolley features adjustable left and right guide rail spacing, synchronous vertical lifting, good structural load-bearing capacity, strong anti-tipping ability, simple operation, and convenient loading and unloading. It solves the problems of easy tipping, difficult cabinet delivery, and the need for numerous delivery personnel and tools associated with such heavy and high-center-of-gravity circuit breakers. This invention achieves safe transfer and easy cabinet delivery, meeting the application requirements of different widths of ZN85 circuit breakers and varying cabinet guide rail heights.

[0005] This invention is achieved through the following technical solution:

[0006] A 2-DOF adjustable circuit breaker transfer trolley is used for the safe transfer and easy delivery of domestically produced ZN85 circuit breakers to cabinets. It includes a main frame of the trolley, 8-inch heavy-duty casters, fixed wheels, a horizontal distance adjustment mechanism, a vertical lifting mechanism, and a hand-cranked drive mechanism.

[0007] The main frame of the trolley consists of left and right handrail columns, a rear support, and left and right support arms. The left and right handrail columns are mounted on the rear support of the trolley. Eight-inch heavy-duty casters and fixed wheels are mounted below the rear support and on the left and right support arms, respectively, for support, movement, and guidance. Two sets of horizontal distance adjustment mechanisms with self-locking screws and guide shafts (stationary ends) are symmetrically fixed on the rear support. The horizontal screw nuts and flange bushings are mounted on the left and right support arms (moving ends). When the horizontal self-locking screws are manually operated, the distance between the left and right support arms will change. Two vertical lifting mechanisms are respectively mounted on... On the left and right support arms, in their vertical positions, the adjustable self-locking screws, vertical guide shafts, and bases are fixedly installed (stationary end). The vertical screw nut is installed on the side of the guide rail support platform (moving end). Two hand-cranked drive mechanisms are installed on the left and right support arms in their horizontal positions, employing a gear structure to cooperate with the vertical lifting mechanism to transmit torque. When the hand-cranked drive mechanism is manually operated, it drives the adjustable self-locking screws in the left and right support arms to move, indirectly and synchronously driving the guide rail support platform to move up and down, thus achieving vertical distance adjustment. In summary, the horizontal distance adjustment mechanism controls the horizontal degree of freedom movement of the left and right support arms, which is the guide rail gauge, while the vertical lifting mechanism controls the vertical degree of freedom movement of the height.

[0008] Preferably, in order to ensure space for loading and unloading the load-bearing circuit breaker, two handrail columns are symmetrically arranged on the left and right sides of the rear support of the transfer trolley, with a foot pedal between the columns. The foot pedal is free of any obstructions, allowing personnel to enter and stand on the foot pedal to load and unload the ZN85 circuit breaker.

[0009] Preferably, to achieve both load-bearing capacity and transfer function while lowering the center of gravity, the rear part of the transfer trolley has three 8-inch heavy-duty swivel casters fixed in a stable triangular arrangement under the foot pedal of the rear support of the transfer trolley using screws. The front part of the transfer trolley has two fixed wheels mounted on the square tubes of the left and right support arms. The wheelbase between the rear and front parts of the transfer trolley is significantly larger than the wheelbase of the circuit breaker chassis, lowering the center of gravity of the transfer trolley and improving its anti-tipping ability.

[0010] Preferably, to achieve manual adjustment of the horizontal distance and horizontal guidance, two sets of horizontally adjusting self-locking screw pairs and guide shaft pairs are respectively installed within the aforementioned 400mm spacing space. The horizontally adjusting self-locking screw pair consists of a horizontally adjusting self-locking screw and a screw support. The screw support is installed on the side of the reinforcing rib plate. After the horizontally adjusting self-locking screw shaft is assembled with the screw nut, it passes through the flange holes on the left and right support arms, and both ends are installed in the bearing seats of the screw support, allowing for flexible rotation. A handwheel is fixedly installed at the extended end of the horizontally adjusting self-locking screw. Finally, the horizontal screw nut is fixed on the left and right support arms. After manually turning the handwheel, the horizontally adjusting self-locking screw can rotate in both directions and drive the screw nut to move horizontally. Two sets of guide shaft pairs are installed above the horizontally adjusting self-locking screw pairs. They consist of guide shafts, flange sleeves, and optical shaft supports. The flange sleeves are fixed on the left and right support arms, and the guide shafts pass through the flange sleeves and are fixed at both ends on the optical shaft supports, allowing for smooth sliding.

[0011] Preferably, to achieve synchronous vertical lifting motion, two sets of vertically adjustable self-locking screw pairs and vertical guide pairs are vertically and symmetrically installed in the middle vertical beam area of ​​the left and right support arms. Each vertically adjustable self-locking screw pair consists of a vertically adjustable self-locking screw, a vertical screw support, and a vertical screw nut. After the vertical screw nut is installed on the vertically adjustable self-locking screw, both ends are fixed to the vertical screw support, which is fixed to the inner surface of the C-shaped steel of the middle vertical beam for support. The vertical guide pair consists of a vertical guide shaft and a shaft base, installed on both sides of the vertically adjustable self-locking screw pair. The shaft base is fixed to the inner surface of the C-shaped steel of the middle vertical beam for support. The vertical screw nut is fixed to a sliding table, which is a machined part. One end face has five base-shaped bosses milled on it, with vertical guide shaft holes and vertical screw nut flange holes. Four threaded holes are evenly distributed around the vertical screw nut flange shaft. The other end face has five M12 threaded holes for fixing the guide rail support table. The guide rail support platform is a welded component consisting of a trapezoidal steel plate, a base plate, and embedded guide rails. During installation, the vertical screw nut is adjusted to the same height. When the two self-locking screws rotate synchronously, they drive the guide rail support platform to lift synchronously. When used to lift ZN85 circuit breakers to adapt to different switchgear guide rail heights, the platform can be adjusted to a suitable height so that the upper guide rail surface of the transfer trolley is on the same horizontal plane as the guide rail surface on the switchgear, facilitating the insertion of the circuit breaker into the switchgear.

[0012] Preferably, to ensure manual operability and synchronized lifting of the guide rail support platform, a gear structure with a certain ratio is used to reduce the large torque generated by the self-locking screw pair for vertical adjustment due to the load, until it reaches a torque range that can be manually cranked. A more preferred solution is to fix a bevel tooth to the upper end of the self-locking screw via a keyway, which transmits the torque to another hand-cranked drive mechanism with bevel teeth. This hand-cranked drive mechanism is mounted on the crossbeams of the left and right support arms. One end of the bevel tooth engages with the bevel tooth on the self-locking screw, while the other end engages with a hand-cranked bevel tooth with a hexagonal shaft hole. The two ends of the hand-cranked bevel tooth are fitted with round holes on the crossbeam via mounting plates, and are then confined by the mounting plates to a position where they cannot move left or right but can rotate smoothly. For synchronization, an operating shaft passes through the hexagonal holes of the hand-cranked bevel teeth on the left and right support arms. When the operating shaft is cranked using a specially designed unidirectional hand crank, the hand-cranked bevel teeth move synchronously, ultimately achieving synchronized lifting of the guide rail support platform.

[0013] The beneficial effects of this invention are:

[0014] This invention uses a hand-cranked drive mechanism to adjust the horizontal distance adjustment mechanism to control the distance between the circuit breaker wheel guide rails on the left and right support arms, thereby enabling manual adjustment of the adapter width of the transported circuit breaker. Its vertical lifting mechanism, equipped with a hand crank, allows for vertical lifting by cranking the handle up and down, ensuring seamless alignment between the transfer trolley rails and the switchgear rails, and enabling adjustable height adjustment of the circuit breaker switchgear. All components work together to facilitate the installation or maintenance of ZN85 heavy-duty circuit breakers from different manufacturers, from loading to transfer to parallel insertion into the switchgear. This invention provides a transfer trolley for the safe transfer of ZN85 circuit breakers of varying widths from domestic manufacturers into the KYN61 cabinet. Its left and right rail spacing is adjustable, and it features synchronous vertical lifting. The structure boasts good load-bearing capacity, strong anti-tipping ability, simple operation, and convenient loading and unloading. It solves the problems of easy tipping, difficult cabinet delivery, and the need for numerous personnel and tools required for transporting such heavy and high-center-of-gravity circuit breakers, achieving safe and easy transfer and meeting the application requirements of different ZN85 widths and cabinet rail heights. Attached Figure Description

[0015] Figure 1 The image shown is a side view of the shaft of a transfer trolley used in a 1.2-meter wide switch cabinet with a rail height of 75mm, a ZN85 circuit breaker, and a chassis wheel track of 882mm.

[0016] Figure 2 The image shown is a two-sided view of the main frame of a trolley with adjustable 2 degrees of freedom for circuit breakers according to the present invention.

[0017] Figure 3 The image shown is a front view of a horizontal distance adjustment mechanism for a 2-DOF adjustable circuit breaker transfer trolley according to the present invention.

[0018] Figure 4 The image shown is a side view of an embodiment of the horizontal distance adjustment mechanism for a 2-DOF adjustable circuit breaker transfer trolley according to the present invention.

[0019] Figure 5 The image shown is a two-axis side view of a vertical lifting mechanism for a 2-DOF adjustable circuit breaker transfer trolley according to the present invention.

[0020] Figure 6 The image shown is a side view of the hand-cranked drive mechanism of a 2-DOF adjustable circuit breaker transfer trolley according to the present invention.

[0021] In the attached diagram: 1-Transfer trolley; 2-Main frame; 3-Heavy-duty casters; 4-Fixed wheels; 5-Horizontal distance adjustment mechanism; 6-Vertical lifting mechanism; 7-Hand-crank drive mechanism; 2.1-Left handrail column; 2.2-Right handrail column; 2.3-Rear support; 2.4-Left support arm; 2.5-Right support arm; 2.3.1-Foot pedal; 2.3.2-Vertical plate; 2.3.3-Guide shaft support; 2.3.4-Reinforcing rib plate; 2.4.1-Intermediate vertical beam; 2.4.2-Vertical beam; 2.4.3-Horizontal beam; 2.4.4-Square tube; 2.4.5-Reinforcing square tube; 5.1-Horizontal adjustment self-locking screw pair; 5.2-Guide shaft pair; 5.3-Screw nut; 5.4-Handwheel; 5.1. 1-Horizontal Adjustable Self-Locking Lead Screw; 5.1.2-Lead Screw Support; 5.2.1-Guide Shaft; 5.2.2-Flange Bushing; 5.2.3-Optical Shaft Support; 6.1-Up-Down Adjustable Self-Locking Lead Screw Pair; 6.2-Vertical Guide Pair; 6.1.1-Up-Down Adjustable Self-Locking Lead Screw; 6.1.2-Vertical Lead Screw Support; 6.1.3-Vertical Lead Screw Nut; 6.2.1-Vertical Guide Shaft; 6.2.2-Shaft Base; 6.3-Sliding Table; 6.5-Guide Rail Support Table; 6.5.1-Trapezoidal Steel Plate; 6.5.2-Base Plate; 6.5.3-Embedded Guide Rail; 7.1-Bevel Gear A; 7.2-Bevel Gear B; 7.3-Bevel Gear C; 7.4-Hand-Cranked Bevel Gear; 7.5-Mounting Plate; 7.6-Hand-Crank Handle. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0023] It should be noted that, in this invention, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0025] A 2-DOF adjustable circuit breaker transfer trolley includes a main frame, wherein: the main frame includes a rear support, a left support arm, and a right support arm; the bottom of the rear support is provided with multiple heavy-duty omnidirectional wheels; the bottom of the left and right support arms are each equipped with fixed wheels; two horizontal distance adjustment mechanisms are symmetrically fixedly installed on the rear support; the horizontal distance adjustment mechanisms are used to adjust the distance between the left and right support arms; vertical lifting mechanisms are respectively installed at the vertical positions of the left and right support arms; the vertical lifting mechanisms include guide rail support platforms; hand-cranked drive mechanisms are respectively installed at the horizontal positions of the left and right support arms; the hand-cranked drive mechanisms transmit torque through a transmission component in cooperation with the vertical lifting mechanisms, and when the hand-cranked drive mechanisms are manually operated, they drive the horizontal distance adjustment mechanisms to move, indirectly and synchronously driving the guide rail support platforms to move up and down, thereby realizing vertical distance adjustment.

[0026] Specifically, the main frame also includes a left handrail column and a right handrail column; the left handrail column and the right handrail column are respectively installed on the rear support; the left handrail column and the right handrail column are both sheet metal bending parts, with handle fixing holes and holes for fixing to the rear support for transport.

[0027] Specifically, the rear support is mainly composed of a foot pedal, a vertical plate, and a guide shaft support mounting plate welded perpendicularly to each other to form a "Z"-shaped base; four reinforcing ribs for fixing the two sets of horizontal distance adjustment mechanisms are welded within the angle range between the vertical plate and the guide shaft; the reinforcing ribs are combined in pairs to form an area for installing the two sets of horizontal distance adjustment mechanisms.

[0028] Specifically, both the left support arm and the right support arm are mainly welded together by a middle vertical beam, a vertical beam, a horizontal beam, a square tube, and a reinforcing square tube; the middle vertical beam is a C-shaped steel piece, and the inner surface of the C-shaped steel is provided with a space to accommodate the movement of the vertical lifting mechanism.

[0029] Specifically, the guide rail support platform includes a left guide rail support platform and a right guide rail support platform; both the left and right guide rail support platforms are composed of a sliding table and a guide rail tray; one end face of the sliding table is milled with five base-shaped bosses, and the bosses have guide shaft holes and vertical screw nut flange holes; the guide rail tray is mainly welded from a trapezoidal steel plate, a base plate, and embedded guide rails.

[0030] Specifically, the horizontal distance adjustment mechanism includes a horizontal adjustment self-locking screw pair and a guide shaft pair; the horizontal adjustment self-locking screw pair includes a horizontal adjustment self-locking screw, a screw support, and a screw nut; the screw support is installed on the side of the reinforcing rib plate; after the horizontal adjustment self-locking screw is assembled with the screw nut, it passes through the flange holes on the left and right support arms, and both ends are installed in the bearing seats of the screw support and can rotate flexibly; a handwheel is fixedly installed at the extended end of the horizontal adjustment self-locking screw; when the screw nut is fixed on the left and right support arms, and the handwheel is manually turned, the horizontal adjustment self-locking screw can rotate in both directions and drive the screw nut to move horizontally.

[0031] Specifically, the guide shaft assembly is installed above the horizontal adjusting self-locking screw assembly. The guide shaft assembly mainly consists of a guide shaft, a flange bushing, and a light shaft support. The flange bushing is fixed on the left support arm and the right support arm. After passing through the flange bushing, the guide shaft is fixed at both ends on the light shaft support and can slide smoothly.

[0032] Specifically, the vertical lifting mechanism further includes an adjustable self-locking screw pair and a vertical guide pair; the adjustable self-locking screw pair mainly consists of an adjustable self-locking screw, a vertical screw support, and a vertical screw nut; after the vertical screw nut is installed on the adjustable self-locking screw, both ends are fixed on the vertical screw support; the vertical screw support is fixed on the inner surface of the C-shaped steel of the middle vertical beam to provide support.

[0033] Specifically, the vertical guide pair is installed on both sides of the upper and lower adjustable self-locking screw pair; the vertical guide pair mainly consists of a vertical guide shaft and a shaft base assembly; the shaft base is fixed to the inner surface of the intermediate vertical beam steel to provide support; the vertical screw nut is fixed to the sliding table.

[0034] Specifically, the hand-cranked drive mechanism mainly consists of a set of active bevel teeth and a set of driven bevel teeth. The hand-cranked bevel teeth in the driven bevel teeth have a hexagonal hole hollowed out in the center.

[0035] Example:

[0036] like Figure 1 The image shows a side view of an embodiment of a transfer trolley 1 used in a 1.2-meter wide switch cabinet with a rail height of 75mm, a ZN85 circuit breaker, and a chassis wheel track of 882mm. It is assembled from the trolley main frame 2, 8-inch heavy-duty casters 3, fixed wheels 4, a horizontal distance adjustment mechanism 5, a vertical lifting mechanism 6, and a hand-cranked drive mechanism 7. The operation process can be simply described as follows: the horizontal distance adjustment mechanism 5 and the vertical lifting mechanism 6 are manually operated to adjust the rail gauge to 882mm and the rail height to 75mm.

[0037] like Figure 2 The image shown is a two-axis side view of the main frame of a trolley with adjustable 2 degrees of freedom for a circuit breaker transfer trolley according to the present invention. Figure 2 The main frame of the trolley shown consists of a left handrail column 2.1, a right handrail column 2.2, a rear support 2.3, a left support arm 2.4, and a right support arm 2.5. The left and right handrail columns are mounted on the rear support of the trolley; the rear support is welded together from a foot pedal 2.3.1, a vertical plate 2.3.2, a guide shaft support 2.3.3, and a reinforcing rib plate 2.3.4. The reinforcing rib plates are combined in pairs to form a space with a spacing of 400mm, which is the area for installing two sets of horizontal distance adjustment mechanisms 5; the left support arm 2.4 and the right support arm 2.5 are both welded together from a middle vertical beam 2.4.1, a vertical beam 2.4.2, a horizontal beam 2.4.3, a square tube 2.4.4, and a reinforcing square tube 2.4.5.

[0038] like Figure 3 The front view shown is of a horizontal distance adjustment mechanism 5 of a 2-DOF adjustable circuit breaker transfer trolley according to the present invention. Figure 3As shown: Two sets of horizontally adjusting self-locking screw pairs 5.1 and guide shaft pairs 5.2 are respectively installed in the space with a spacing of 500mm. The horizontally adjusting self-locking screw pair 5.1 consists of a horizontally adjusting self-locking screw 5.1.1 and a screw support 5.1.2. The screw support 5.1.2 is installed on the side of the reinforcing rib plate. After the horizontally adjusting self-locking screw 5.1.1 is assembled with the screw nut 5.3, it passes through the flange holes on the left support arm 2.4 and the right support arm 2.5, and its two ends are installed in the bearing seats of the screw support 5.1.2 and can rotate flexibly. A handwheel 5.4 is fixedly installed at the extended end of the horizontally adjusting self-locking screw. Finally, the horizontal screw nut 5.3 is fixed on the left support arm 2.4 and the right support arm 2.5. After manually turning the handwheel 5.4, the horizontally adjusting self-locking screw 5.1.1 can rotate in both directions and can drive the screw nut 5.3 to move horizontally. Two guide shaft pairs 5.2 are installed above the horizontal adjusting self-locking screw pair 5.1. Each pair consists of a guide shaft 5.2.1, a flange bushing 5.2.2, and a smooth shaft support 5.2.3. The flange bushing 5.2.2 is fixed on the left support arm 2.4 and the right support arm 2.5. The guide shaft 5.2.1 passes through the flange bushing 5.2.2 and is fixed at both ends on the smooth shaft support 5.2.3, allowing it to slide smoothly.

[0039] like Figure 4 The image shown is a side view of an embodiment of the horizontal distance adjustment mechanism 5 of a 2-DOF adjustable circuit breaker transfer trolley according to the present invention, which adjusts the track gauge. Figure 4 As shown: In this implementation example, the track gauge of the circuit breaker chassis is 882mm. It is only necessary to operate the horizontal distance adjustment mechanism 5 by turning the handwheel 5.4 to adjust the left support arm 2.4 and the right support arm 2.5 to a certain distance so that the track gauge is equal to 882mm.

[0040] like Figure 5The diagram shows a six-axis two-side view of a vertical lifting mechanism for a two-degree-of-freedom adjustable circuit breaker transfer trolley according to the present invention. Two sets of vertically adjustable self-locking screw pairs 6.1 and vertical guide pairs 6.2 are vertically and symmetrically installed in the inner area of ​​the C-shaped steel of the middle vertical beam 2.4.2 of the left support arm 2.4 and the right support arm 2.5. The vertically adjustable self-locking screw pair 6.1 consists of a vertically adjustable self-locking screw 6.1.1, a vertical screw support 6.1.2, and a vertical screw nut 6.1.3. After the vertical screw nut 6.1.3 is installed on the vertically adjustable self-locking screw 6.1.1, both ends are fixed on the vertical screw support 6.1.2. The vertical screw support 6.1.2 is fixed on the inner surface of the C-shaped steel of the middle vertical beam 2.4.2 and provides support. The vertical guide pair 6.2 consists of a vertical guide shaft 6.2.1 and a shaft base 6.2.2, and is installed on both sides of the upper and lower adjustable self-locking screw pair 6.1. The shaft base 6.2.2 is fixed to the inner surface of the C-shaped steel of the middle vertical beam 2.4.2 and serves as a support. The vertical screw nut 6.1.3 is fixed on the sliding table 6.3, which is a machined part. One end face of the sliding table has five base-shaped bosses milled on it, with holes for the vertical guide shaft 6.2.1 and flange holes for the vertical screw nut 6.1.3. Four threaded holes are evenly distributed around the flange shaft of the vertical screw nut 6.1.3. The other end face has five M12 threaded holes for fixing the guide rail support table 6.5. The guide rail support table 6.5 is a welded part made of trapezoidal steel plate 6.5.1, base plate 6.5.2, and embedded guide rail 6.5.3. During installation, adjust the vertical lead screw nut 6.1.3 to the same height. When the two vertical self-locking lead screws 6.1.1 rotate synchronously, they will drive the guide rail support platform 6.5 to lift synchronously. In this implementation example, when the guide rail height of different switchgear cabinets is 75mm, the vertical lifting mechanism 6 can be manually operated to lift the guide rail support platform 6.5 to a suitable height, so that the upper guide rail surface of the transfer trolley is on the same horizontal plane as the guide rail surface on the switchgear, which facilitates the insertion of the circuit breaker into the switchgear.

[0041] like Figure 6The diagram shows a two-axis side view of a hand-cranked drive mechanism 7 of a 2-DOF adjustable circuit breaker transfer trolley according to the present invention. To improve manual operability and ensure synchronous lifting of the guide rail support platform 6.5, a gear structure with a certain ratio is used to reduce the large torque generated by the up-and-down self-locking screw pair 6.1 due to the load, until it reaches a torque range that can be manually cranked. A more preferred solution is to fix a bevel tooth A 7.1 at the upper end of the up-and-down self-locking screw 6.1.1 via a keyway, which transmits the torque to another hand-cranked drive mechanism 7 with bevel teeth. This hand-cranked drive mechanism is mounted on the crossbeams 2.4.3 of the left support arm 2.4 and the right support arm 2.5. One end of the bevel tooth engages with the bevel tooth B 7.2 on the up-and-down self-locking screw, and the other end has a bevel tooth C... 7.3 is paired with a hand-cranked bevel gear 7.4 with a hexagonal shaft hole. The two ends of the hand-cranked bevel gear 7.4 are fitted with round holes on the mounting plate and crossbeam 2.4.3 respectively, and are then confined by the mounting plate 7.5 to a position where it cannot move left or right but can rotate smoothly. The synchronization solution involves passing an operating shaft through the hexagonal holes of the hand-cranked bevel gear 7.4 on the left support arm 2.4 and right support arm 2.5. When the operating shaft is cranked using a specially designed one-way hand crank 7.6, the hand-cranked bevel gear 7.4 moves synchronously, ultimately achieving synchronous lifting of the guide rail support platform.

[0042] This invention utilizes a hand-cranked drive mechanism to adjust the horizontal distance between the guide rails of the circuit breaker wheels on the left and right support arms, enabling manual adjustment of the width of the transported circuit breaker. Its vertical lifting mechanism, equipped with a hand-cranked handle, allows for vertical lifting by cranking the handle up and down, ensuring seamless alignment between the transport trolley guide rails and the switchgear guide rails, thus achieving parallel height adjustment of the transported circuit breaker and switchgear. Together, these mechanisms facilitate the installation or maintenance of ZN85 heavy-duty circuit breakers from different manufacturers, from loading to transfer to parallel insertion into the switchgear. This invention provides a transport trolley for the safe transport of ZN85 circuit breakers of varying widths from domestic manufacturers, directly into the KYN61 cabinet. Its adjustable left and right guide rail spacing, synchronous vertical lifting function, good structural load-bearing capacity, strong anti-tipping ability, simple operation, and convenient loading and unloading solve the problems of easy tipping, difficult cabinet delivery, and the need for numerous personnel and tools required for transporting such heavy and high-center-of-gravity circuit breakers. It achieves safe transport and easy cabinet delivery, meeting the application requirements of different widths of ZN85 circuit breakers and cabinet guide rail heights.

[0043] The technical solutions provided by the embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of the present invention. The descriptions of the embodiments above are only for helping to understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A 2-DOF adjustable circuit breaker transfer trolley, comprising a main frame, characterized in that: The main frame includes a rear support, a left support arm, and a right support arm; the rear support is equipped with multiple heavy-duty casters at its bottom; fixed wheels are installed at the bottom of both the left and right support arms; two horizontal distance adjustment mechanisms are symmetrically fixedly installed on the rear support; these mechanisms are used to adjust the distance between the left and right support arms; vertical lifting mechanisms are installed at the vertical positions of the left and right support arms respectively; each vertical lifting mechanism includes a guide rail support platform; hand-cranked drive mechanisms are installed at the horizontal positions of the left and right support arms respectively; these hand-cranked drive mechanisms transmit torque through a transmission assembly in cooperation with the vertical lifting mechanisms. When the hand-cranked drive mechanism is manually operated, it drives the vertical lifting mechanism to move, indirectly and synchronously driving the guide rail support platform to move up and down, thereby achieving vertical distance adjustment. The left and right support arms are both welded together from a central vertical beam, a vertical beam, a horizontal beam, a square tube, and a reinforcing square tube. The central vertical beam is a C-shaped steel piece, and its inner surface has a space to accommodate the movement of the vertical lifting mechanism. The hand-cranked drive mechanism consists of a set of active bevel teeth and a set of driven bevel teeth. The driven bevel teeth have a hexagonal hole hollowed out in their shaft center. An operating shaft passes through the hexagonal hole of the hand-cranked bevel teeth on the left and right support arms. When the operating shaft is cranked by the hand crank handle, it drives the hand-cranked bevel teeth to move synchronously, ultimately achieving synchronous lifting of the guide rail support platform.

2. The 2-DOF adjustable circuit breaker transfer trolley according to claim 1, characterized in that: The main frame also includes a left handrail column and a right handrail column; the left handrail column and the right handrail column are respectively installed on the rear support; the left handrail column and the right handrail column are both sheet metal bending parts, with handle fixing holes and holes for fixing to the rear support for transport.

3. The 2-DOF adjustable circuit breaker transfer trolley according to claim 1, characterized in that: The rear support is formed by welding the foot pedal, vertical plate, and guide shaft support mounting plate perpendicularly to each other to form a "Z"-shaped base; four reinforcing ribs for fixing the two sets of horizontal distance adjustment mechanisms are welded within the angle range between the vertical plate and the guide shaft; the reinforcing ribs are combined in pairs to form an area for installing the two sets of horizontal distance adjustment mechanisms.

4. The 2-DOF adjustable circuit breaker transfer trolley according to claim 1, characterized in that: The guide rail support platform includes a left guide rail support platform and a right guide rail support platform; both the left and right guide rail support platforms are composed of a sliding table and a guide rail tray; one end face of the sliding table is milled with five base-shaped bosses, and the bosses have guide shaft holes and vertical screw nut flange holes; the guide rail tray is welded from a trapezoidal steel plate, a base plate, and embedded guide rails.

5. The 2-DOF adjustable circuit breaker transfer trolley according to claim 3, characterized in that: The horizontal distance adjustment mechanism includes a horizontal adjustment self-locking screw pair and a guide shaft pair; the horizontal adjustment self-locking screw pair includes a horizontal adjustment self-locking screw, a screw support, and a screw nut. The lead screw support is installed on the side of the reinforcing rib plate. After the lead screw nut is assembled, the horizontal adjusting self-locking lead screw passes through the flange holes on the left and right support arms and is installed in the bearing seats of the lead screw support at both ends, allowing it to rotate flexibly. A handwheel is fixedly installed at the extended end of the horizontal adjusting self-locking lead screw. When the lead screw nut is fixed on the left and right support arms, and the handwheel is manually turned, the horizontal adjusting self-locking lead screw can rotate in both directions and drive the lead screw nut to move horizontally.

6. The 2-DOF adjustable circuit breaker transfer trolley according to claim 5, characterized in that: The guide shaft assembly is installed above the horizontal adjusting self-locking screw assembly. The guide shaft assembly consists of a guide shaft, a flange bushing, and a light shaft support. The flange bushing is fixed on the left support arm and the right support arm. After passing through the flange bushing, the guide shaft is fixed at both ends on the light shaft support and can slide smoothly.

7. The 2-DOF adjustable circuit breaker transfer trolley according to claim 4, characterized in that: The vertical lifting mechanism also includes an adjustable self-locking screw pair and a vertical guide pair; the adjustable self-locking screw pair consists of an adjustable self-locking screw, a vertical screw support, and a vertical screw nut; after the vertical screw nut is installed on the adjustable self-locking screw, both ends are fixed on the vertical screw support; the vertical screw support is fixed on the inner surface of the C-shaped steel of the middle vertical beam to provide support.

8. The 2-DOF adjustable circuit breaker transfer trolley according to claim 7, characterized in that: The vertical guide pair is installed on both sides of the upper and lower adjustable self-locking screw pair; the vertical guide pair consists of a vertical guide shaft and a shaft base; the shaft base is fixed to the inner surface of the intermediate vertical beam C-shaped steel to provide support; the vertical screw nut is fixed to the sliding table.

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