Positioning mechanism and lifting type switch handcart

Abstract

The invention relates to the field of circuit breaker auxiliary equipment, and discloses a positioning mechanism and a lifting type switch handcart, comprising an operating rod which comprises a mounting rack fixedly connected with equipment, a first control rod rotatably connected with the mounting rack, a positioning pin arranged at one end of the mounting rack, and a diameter expanding plate located in the positioning pin, the limiting screw sleeve is in sliding connection with one group of mounting frames, and the limiting screw sleeve is in threaded connection with the first control rod; through the synergistic effect of the expansion type positioning pin driven by the operating rod and the limiting mechanism, double reliable fixing is achieved, and the defects that a traditional single hook is insufficient in constraining force and prone to loosening are thoroughly overcome; and meanwhile, the four sets of independently-controlled lifting mechanisms are matched with visual indication of the bubble parallelism instrument, so that accurate adjustment and judgment of the height and the horizontal state of the handcart are realized, the problems that a traditional handcart is difficult to level and low in butt joint efficiency are solved, and the safety and the efficiency of operation are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker auxiliary equipment, and in particular to a positioning mechanism and a lifting switch trolley. Background Technology

[0002] Handcarts are auxiliary maintenance equipment specifically designed for circuit breakers inside switchgear. They are widely used in hydropower plants, substations, industrial plants, and power distribution rooms in high-rise buildings, and are key tools for the inspection and maintenance of switchgear.

[0003] However, existing handcarts have revealed significant shortcomings in practical use, hindering operational efficiency and safety. Firstly, regarding the connection and fixation between the handcart and the switchgear, current technologies generally rely solely on a single positioning hook structure for constraint. This method provides limited constraint force and is applied at a single point. In scenarios involving the transport of heavy equipment or vibration, the hook is prone to loosening, slippage, or even failure, resulting in poor connection reliability and potential safety hazards due to equipment instability. Secondly, in terms of adapting to switchgear of different heights and ensuring docking accuracy, the height adjustment mechanism is often cumbersome to operate, requiring repeated adjustments with external tools. Furthermore, it lacks an intuitive leveling indicator, making it difficult for operators to quickly determine if the handcart is level, leading to low operational efficiency and safety hazards. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is that the existing handcarts have insufficient reliability in connection and fixing constraints, and the height adjustment and leveling judgment are inconvenient, resulting in low work efficiency and safety hazards.

[0005] The above-mentioned technical problems are solved by the following technical solution: This invention proposes a positioning mechanism, which includes an operating lever. The operating lever includes a mounting bracket fixedly connected to the equipment, a first control lever rotatably connected to the mounting bracket, a positioning pin disposed at one end of the mounting bracket, an expansion plate located inside the positioning pin, and a limiting screw sleeve slidably connected to a set of the mounting brackets, wherein the limiting screw sleeve is threadedly connected to the first control lever. Specifically, the positioning pin is inserted into the positioning hole of the switchgear, and then the first control lever is rotated. The first control lever then slides along the limiting screw sleeve in conjunction with the limiting screw sleeve. The first control lever drives the internal expanding plate to move and squeezes the inner end of the positioning pin, causing the expanding plate to expand outward to both sides of the positioning pin, thereby increasing the outer diameter of the positioning pin. This ensures that the positioning pin is fully engaged with the positioning hole of the switchgear. At the same time, the friction generated by the squeezing further improves the stability after positioning, ensuring the stability of subsequent equipment.

[0006] In a preferred embodiment of the positioning mechanism of the present invention: the positioning pin includes a connecting plate fixedly connected to one end of the first control lever, a pin head fixedly connected to the outside of the mounting bracket, and a cone head fixedly connected to the end of the pin head away from the connecting plate. Specifically, when the pin is inserted into the positioning hole, the connecting plate moves towards the pin, which in turn moves the expanding plate and presses against the cone at one end of the pin. Guided by the cone, the expanding plate expands outward. Conversely, when the connecting plate resets, the expanding plate moves away from the cone and resets under the guidance of the side wall of the pin, thus completing the closing and facilitating separation after the equipment is completed.

[0007] In a preferred embodiment of the positioning mechanism of the present invention: the expanding plate includes a single plate and a double plate, and the single plate and the double plate are hinged inside the pin head by a rotating shaft; Specifically, when the single plate and the double plate are squeezed by the cone head, they will rotate around the pivot, thereby causing the single plate and the double plate to expand outward of the pin head and contact the squeezing positioning hole; when the connecting plate drives the single plate and the double plate to reset, the single plate and the double plate will be squeezed by the pin head wall and rotate around the pivot, and finally reset.

[0008] In a preferred embodiment of the positioning mechanism of the present invention: the first control lever includes a long rod rotatably connected to the mounting bracket, a first screw threadedly connected to the limiting screw sleeve, a first connecting sleeve for connecting the long rod and the first screw, and a fixed knob fixedly connected to the end of the long rod away from the first connecting sleeve; the end of the first screw away from the first connecting sleeve is fixedly connected to the connecting plate. Specifically, rotating the fixed knob will cause the long rod to rotate, and under the transmission of the first connecting sleeve, it will cause the first screw to rotate inside the limiting screw sleeve. By rotating the fixed knob in both directions, the connecting plate at one end of the first screw will move back and forth, thereby realizing the expansion and contraction of the single plate and the double plate.

[0009] The present invention also provides a lifting switch trolley, including the aforementioned positioning mechanism, and further comprising, The frame includes a frame, guide rails fixedly connected to both sides of the top of the frame, and a bubble parallelometer fixedly connected to the outside of the frame; a top plate is fixedly connected to the top of the frame, the operating lever is installed at the bottom of both sides of the frame, and side plates are installed on both sides of the frame. The limiting mechanism includes a hook rotatably connected to the frame, a second operating rod connected to the hook, a positioning bolt fixedly connected to the frame, and a tension spring sleeved on the outside of the second operating rod and the positioning bolt. Specifically, by moving the second operating lever along the groove inside the frame, the hook will deflect at an angle relative to the frame, and the tension spring will be pulled. At this time, the equipment is brought close to the switch cabinet, and the hook is aligned with the hook of the switch cabinet. The second operating lever is then released, and the elasticity of the tension spring will cause the hook to reset and engage with the hook, thus completing the initial connection with the switch cabinet.

[0010] In a preferred embodiment of the lifting switch truck of the present invention: a limiting head is fixedly connected to the surface of the guide rail; Specifically, the limiting head can prevent equipment sliding along the guide rail from derailing and causing different potential hazards.

[0011] In a preferred embodiment of the lifting switch truck of the present invention: the hook includes a hinge plate fixedly connected to the frame, a guide plate hinged to the hinge plate, a limiting pin fixedly connected inside the guide plate, a hook plate slidably connected to the limiting pin, and a fixing screw sleeve fixedly connected to one end of the hook plate. Specifically, when the second operating lever is moved, the guide plate rotates around the connection point with the hinge plate, thereby changing the angle of the hook plate and ensuring that the hook plate can be engaged with the hook of the switch cabinet. The fixing screw ensures that it is connected to the second operating lever.

[0012] In a preferred embodiment of the lifting switch truck of the present invention: the second operating lever includes a second threaded rod slidably connected inside the frame, a third threaded rod threadedly connected to the fixed threaded sleeve, a second connecting sleeve for connecting the second threaded rod and the third threaded rod, and a movable knob threadedly connected to the outside of the second threaded rod; Specifically, when the second threaded rod is turned, the third threaded rod moves under the transmission of the second connecting sleeve, and ultimately drives the guide plate to rotate, changing the angle of the hook plate. After the second threaded rod is released, it will be reset under the action of the tension spring, ensuring that the hook plate is initially engaged with the switch cabinet's hook. Then, the movable knob is rotated, causing it to contact and press against the outer wall of the frame. After the movable knob contacts the frame, it continues to rotate, causing the second threaded rod to slide along the hole axis of the movable knob. Under the sliding of the second threaded rod, the third threaded rod pulls the hook plate, causing the hook plate to slide along the limit pin, and causing the gap between the hook plate and the switch cabinet's hook to gradually decrease until the movable knob can no longer be turned. At this time, there is no gap between the hook plate and the switch cabinet's hook, thus completing one layer of fixation. On this basis, fixing the operating rod again can achieve complete fixation of the equipment, thereby ensuring the stability of the equipment after connection.

[0013] In a preferred embodiment of the lifting switch truck of the present invention: a limiting nut is threaded to the outer side of the second threaded rod, and an elastic element is sleeved on the outer side of the second threaded rod. The elastic element is located between the limiting nut and the frame, and the elastic element can be a spring. Specifically, when the second threaded rod slides and drives the hook plate to complete the connection, the limiting nut will squeeze the elastic element and cause it to contract; when the moving knob is reversed, the elasticity of the elastic element will drive the second threaded rod to reset, ensuring that the hook plate can be separated from the hook of the switch cabinet.

[0014] In a preferred embodiment of the lifting switch truck of the present invention: it further includes a lifting mechanism, which includes a base plate, a jack installed on the top of the base plate, an inner sleeve fixedly connected to the top of the base plate, an outer sleeve slidably connected to the inner sleeve, and a universal wheel installed on the bottom of the base plate; the inner sleeve and the inner wall of the outer sleeve are provided with a liner, the liner is fixedly connected to the outer sleeve, and a baffle is provided on the outer side of the connection between the universal wheel and the base plate; The output end of the jack is fixedly connected to the outer casing and the frame; Specifically, by rotating the plum blossom knobs of different jacks, the lifting and lowering of each corner can be controlled independently. Combined with the indication of the bubble level instrument, the vehicle's horizontal height and posture can be precisely adjusted, easily adapting to switchgear rails of different heights, while also ensuring the stability of the connection between subsequent equipment and switchgear.

[0015] The beneficial effects of this invention are as follows: the expansion positioning pin driven by the operating lever works in conjunction with the limiting mechanism to achieve double reliable fixation, completely solving the defects of insufficient constraint force and easy loosening of traditional single hooks; at the same time, the four independently controlled lifting mechanisms, together with the intuitive indication of the bubble level, realize the precise adjustment and judgment of the height and level of the handcart, thereby overcoming the problems of difficult leveling and low docking efficiency of traditional handcarts, and significantly improving the safety and efficiency of the operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0017] Figure 1 A schematic diagram of the overall structure of the present invention is shown.

[0018] Figure 2 An exploded view of the overall structure of the present invention is shown.

[0019] Figure 3 A bottom view of the frame of the present invention is shown.

[0020] Figure 4 A partial structural schematic diagram of the present invention is shown.

[0021] Figure 5 A schematic diagram of the overall structure of the positioning mechanism of the present invention is shown.

[0022] Figure 6 An enlarged structural schematic diagram of part A of the present invention is shown.

[0023] Figure 7 A partial schematic diagram of the two structures of the present invention is shown.

[0024] Figure 8 An enlarged schematic diagram of part B of the present invention is shown.

[0025] Figure 9 An enlarged schematic diagram of part C of the present invention is shown.

[0026] Figure 10 An exploded view of the lifting mechanism of the present invention is shown. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0028] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0029] Reference Figure 1 , Figure 5 , Figure 6 This embodiment provides a positioning mechanism, which includes an operating lever 1. The operating lever 1 includes a mounting bracket 11 fixedly connected to the equipment, a first control lever 12 rotatably connected to the mounting bracket 11, a positioning pin 13 disposed at one end of the mounting bracket 11, an expansion plate 14 located inside the positioning pin 13, and a limiting screw sleeve 15 slidably connected to a set of mounting brackets 11. The limiting screw sleeve 15 is threadedly connected to the first control lever 12. Specifically, the positioning pin 13 is inserted into the positioning hole of the switchgear, and then the first control lever 12 is rotated. The first control lever 12 then slides along the limiting screw sleeve 15 in conjunction with the limiting screw sleeve 15. The first control lever 12 drives the internal expansion plate 14 to move and press the inner end of the positioning pin 13, causing the expansion plate 14 to expand outward to both sides of the positioning pin 13, thereby increasing the outer diameter of the positioning pin 13 and ensuring that the positioning pin 13 is fully engaged with the positioning hole of the switchgear. At the same time, the friction generated by the pressing will further improve the stability after positioning and ensure the stability of subsequent equipment.

[0030] In a preferred embodiment of the positioning mechanism of the present invention: the positioning pin 13 includes a connecting plate 131 fixedly connected to one end of the first control lever 12, a pin head 132 fixedly connected to the outside of the mounting bracket 11, and a cone head 133 fixedly connected to the end of the pin head 132 away from the connecting plate 131. Specifically, when the pin 132 is inserted into the positioning hole, the connecting plate 131 moves toward the pin 132, which in turn moves the expanding plate 14 and presses the cone 133 located at one end of the pin 132. Under the guidance of the cone, the expanding plate 14 expands outward. Conversely, when the connecting plate 131 is reset, the expanding plate 14 moves away from the cone 133 and is reset under the guidance of the side wall of the pin 132, thus completing the closing and facilitating separation after the equipment is completed.

[0031] In a preferred embodiment of the positioning mechanism of the present invention: the expansion plate 14 includes a single plate 141 and a double plate 142, and the single plate 141 and the double plate 142 are hinged to the pin head 132 by a rotating shaft. Specifically, when the single plate 141 and the double plate 142 are squeezed by the cone head 133, they will rotate around the pivot, thereby causing the single plate 141 and the double plate 142 to expand outward of the pin head 132 and contact the squeezing positioning hole; when the connecting plate 131 drives the single plate 141 and the double plate 142 to reset, the single plate 141 and the double plate 142 will be squeezed by the wall of the pin head 132 and rotate around the pivot, and finally reset.

[0032] In a preferred embodiment of the positioning mechanism of the present invention: the first control lever 12 includes a long rod 121 rotatably connected to the mounting bracket 11, a first screw 122 threadedly connected to the limiting screw sleeve 15, a first connecting sleeve 123 for connecting the long rod 121 and the first screw 122, and a fixed knob 124 fixedly connected to the end of the long rod 121 away from the first connecting sleeve 123; the end of the first screw 122 away from the first connecting sleeve 123 is fixedly connected to the connecting plate 131; Specifically, rotating the fixed knob 124 will drive the long rod 121 to rotate. Under the transmission of the first connecting sleeve 123, the first screw 122 will rotate inside the limiting screw sleeve 15. By rotating the fixed knob 124 in both directions, the connecting plate 131 at one end of the first screw 122 will move back and forth, thereby realizing the expansion and contraction of the single plate 141 and the double plate 142.

[0033] In summary, the cone head 133 of the positioning pin 13 is aligned with and inserted into the positioning hole of the switch cabinet, and then the fixed knob 124 is rotated; the fixed knob 124 drives the long rod 121 to rotate, and through the transmission of the first connecting sleeve 123, the first screw 122 rotates within the limiting screw sleeve 15 and generates axial movement; the movement of the first screw 122 drives the connecting plate 131 at its end to move forward toward the pin head 132, thereby pushing the single plate 141 and double plate 142 hinged inside the pin head to slide along the inclined surface of the cone head 133; under the pressure of the inclined surface, the single plate 141 and double plate 142... The connecting shaft expands outward from the center, extending from the side wall of the pin head 132, increasing its outer diameter to form an interference fit and radial compression with the inner wall of the positioning hole. The huge frictional resistance generated by the expansion locking makes the connection extremely stable, completely solving the problems of insufficient constraint force and easy loosening of traditional hooks. Reverse rotation of the fixed knob 124 can make each component move in the opposite direction. The single plate 141 and double plate 142 are retracted under the guidance of the inner wall of the pin head 132, which is convenient for quick disengagement. The operation is simple and requires no additional tools, which significantly improves the reliability, safety and work efficiency of equipment positioning.

[0034] As one embodiment provided, such as Figures 1-10 A lifting-type switch trolley, including a positioning mechanism, and also including, The frame 2 includes a frame 21, guide rails 22 fixedly connected to both sides of the top of the frame 21, and a bubble parallel instrument 23 fixedly connected to the outside of the frame 21; a top plate 24 is fixedly connected to the top of the frame 21, an operating lever 1 is installed at the bottom of both sides of the frame 21, and side plates 25 are installed on both sides of the frame 21. The limiting mechanism 3 includes a hook 31 rotatably connected to the frame 21, a second operating rod 32 connected to the hook 31, a positioning bolt 33 fixedly connected to the frame 21, and a tension spring 34 sleeved on the outside of the second operating rod 32 and the positioning bolt 33. Specifically, by moving the second operating lever 32 along the groove inside the frame 21, the hook 31 will deflect at an angle relative to the frame 21, and the tension spring 34 will be pulled. At this time, the equipment is brought close to the switch cabinet, and the hook 31 is aligned with the hook of the switch cabinet. The second operating lever 32 is then released. Under the elasticity of the tension spring 34, the hook 31 will reset and engage with the hook, thus completing the initial connection with the switch cabinet.

[0035] In a preferred embodiment of the lifting switch trolley of the present invention: a limiting head 221 is fixedly connected to the surface of the guide rail 22; Specifically, the limit head 221 can prevent equipment sliding along the guide rail 22 from derailing and causing different potential hazards.

[0036] In a preferred embodiment of the lifting switch truck of the present invention: the hook 31 includes a hinge plate 311 fixedly connected to the frame 21, a guide plate 312 hinged to the hinge plate 311, a limiting pin 313 fixedly connected inside the guide plate 312, a hook plate 314 slidably connected to the limiting pin 313, and a fixing screw sleeve 315 fixedly connected to one end of the hook plate 314. Specifically, when the second operating lever 32 is moved, the guide plate 312 rotates about the connection point with the hinge plate 311 as the axis, thereby changing the angle of the hook plate 314 to ensure that the hook plate 314 can be engaged with the hook of the switch cabinet, while the fixing screw sleeve 315 ensures that it is connected to the second operating lever 32.

[0037] In a preferred embodiment of the lifting switch truck of the present invention: the second operating lever 32 includes a second threaded rod 321 slidably connected inside the frame 21, a third threaded rod 322 threadedly connected to the fixed screw sleeve 315, a second connecting sleeve 323 for connecting the second threaded rod 321 and the third threaded rod 322, and a movable knob 324 threadedly connected to the outside of the second threaded rod 321. Specifically, turning the second threaded rod 321 causes the third threaded rod 322 to move under the transmission of the second connecting sleeve 323, and ultimately causes the guide plate 312 to rotate, thus changing the angle of the hook plate 314. After releasing the second threaded rod 321, the second threaded rod 321 will be reset under the action of the tension spring 34, ensuring that the hook plate 314 is initially engaged with the switch cabinet's hook. Then, rotating the movable knob 324 causes it to contact and press against the outer wall of the frame 21. After the movable knob 324 contacts the frame 21, continuing to rotate will cause the second threaded rod 322 to move under the transmission of the second connecting sleeve 323, thus changing the angle of the hook plate 314. The threaded rod 321 slides along the bore axis of the movable knob 324. Under the sliding of the second threaded rod 321, the third threaded rod 322 will pull the hook plate 314, causing the hook plate 314 to slide along the limit pin 313, and causing the gap between the hook plate 314 and the switch cabinet hook to gradually narrow until the movable knob 324 can no longer be turned. At this time, there is no gap between the hook plate 314 and the switch cabinet hook, thus completing the first fixation. On this basis, the operation rod 1 can be fixed again to achieve complete fixation of the equipment, thereby ensuring the stability of the equipment after connection.

[0038] In a preferred embodiment of the lifting switch truck of the present invention: the outer side of the second threaded rod 321 is threaded with a limiting nut 325, and an elastic element 326 is sleeved on the outer side of the second threaded rod 321. The elastic element 326 is located between the limiting nut 325 and the frame 21. The elastic element 326 can be a spring. Specifically, when the second threaded rod 321 slides and drives the hook plate 314 to complete the connection, the limit nut 325 will squeeze the elastic element 326 to make it contract; when the knob 324 is rotated in the opposite direction, the elastic element 326 will drive the second threaded rod 321 to reset, ensuring that the hook plate 314 can be separated from the hook of the switch cabinet.

[0039] In a preferred embodiment of the lifting switch truck of the present invention: it further includes a lifting mechanism 4, which includes a base plate 41, a jack 42 installed on the top of the base plate 41, an inner sleeve 43 fixedly connected to the top of the base plate 41, an outer sleeve 44 slidably connected to the inner sleeve 43, and a caster wheel 45 installed at the bottom of the base plate 41; the inner sleeve 43 and the inner sleeve 44 are provided with a liner 46, the liner 46 is fixedly connected to the outer sleeve 44, and a baffle 47 is provided on the outer side of the connection between the caster wheel 45 and the base plate 41; The output end of the jack 42 is fixedly connected to the outer casing 44 and the frame 21; Specifically, by rotating the plum blossom knobs of different jacks 42, the lifting and lowering of each corner can be controlled independently. With the indication of the bubble level 23, the vehicle's horizontal height and posture can be precisely adjusted, easily adapting to switchgear rails of different heights, while also ensuring the stability of the connection between subsequent equipment and switchgear.

[0040] In summary, by first rotating the plum blossom knobs at the top of each jack 42, the lifting height of the four lifting mechanisms 4 can be independently adjusted. Combined with the intuitive indication from the bubble level 23, the frame 21 of the cart 2 can be precisely adjusted to a horizontal state, easily adapting to switchgear guide rails of different heights and overcoming the influence of uneven ground, laying the foundation for subsequent precise docking. The handcart is pushed to the front of the switchgear, and the second threaded rod 321 is moved along the groove inside the frame 21. This moves the third threaded rod 322 via the second connecting sleeve 323, causing the guide plate 312 to rotate around its hinge point with the hinge plate 311, thus changing the angle of the hook plate 314 and simultaneously stretching the tension spring 34. After aligning the hook plate 314 with the switchgear's hook and releasing it, the hook plate 314 automatically swings back and hooks the hook under the restoring force of the tension spring 34, completing a quick and effortless initial docking. First, the connection is made; then, the knob 324 is rotated so that its end face presses against the outer wall of the frame 21. Continuing to rotate drives the second threaded rod 321 to slide inward, and then through the threaded engagement of the third threaded rod 322 with the fixed screw sleeve 315, the hook plate 314 is pulled to slide along the limit pin 313, so that the gap between it and the switch cabinet hook is gradually eliminated until they fit tightly, achieving the first layer of reliable locking. During this process, the elastic element 326 is compressed; finally, the positioning pin 13 of the operating rod 1 is inserted into the positioning hole at the bottom of the switch cabinet, and the fixed knob 124 is rotated. The first screw 122 is driven through the long rod 121 and the first connecting sleeve 123, pushing the connecting plate 131 and the single plate 141 and double plate 142 of the expansion plate 14 to expand along the inclined surface of the cone head 133, so that the pin head 132 forms an interference expansion fixation with the positioning hole, completing the final second layer of rigid locking. Thus, the combination of the rapid pre-locking of the limiting mechanism 3 and the final expansion locking of the positioning mechanism 1 forms a double-insurance fixing system, fundamentally solving the problem of unreliable traditional handcart connections; while the independent lifting mechanism 4 and the intuitive bubble level 23 solve the pain points of difficult leveling and inaccurate docking. The entire device works in tandem, significantly improving the efficiency, safety and adaptability of switchgear maintenance operations.

[0041] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A positioning mechanism, characterized in that: Includes the control lever (1). The operating lever (1) includes a mounting bracket (11) fixedly connected to the equipment, a first control lever (12) rotatably connected to the mounting bracket (11), a positioning pin (13) disposed at one end of the mounting bracket (11), an expansion plate (14) located inside the positioning pin (13), and a limiting screw sleeve (15) slidably connected to a set of the mounting brackets (11), wherein the limiting screw sleeve (15) is threadedly connected to the first control lever (12).

2. The positioning mechanism according to claim 1, characterized in that: The positioning pin (13) includes a connecting plate (131) fixedly connected to one end of the first control lever (12), a pin head (132) fixedly connected to the outside of the mounting bracket (11), and a cone head (133) fixedly connected to the end of the pin head (132) away from the connecting plate (131).

3. The positioning mechanism according to claim 2, characterized in that: The expansion plate (14) includes a single plate (141) and a double plate (142), and the single plate (141) and the double plate (142) are hinged inside the pin head (132) by a pivot.

4. The positioning mechanism according to claim 2 or 3, characterized in that: The first control lever (12) includes a long rod (121) rotatably connected to the mounting bracket (11), a first screw (122) threadedly connected to the limiting screw sleeve (15), a first connecting sleeve (123) for connecting the long rod (121) and the first screw (122), and a fixed knob (124) fixedly connected to one end of the long rod (121) away from the first connecting sleeve (123); one end of the first screw (122) away from the first connecting sleeve (123) is fixedly connected to the connecting plate (131).

5. A lifting-type switch trolley, characterized in that: Including the positioning mechanism as described in any one of claims 1 to 4, it further includes, The frame (2) includes a frame (21), guide rails (22) fixedly connected to both sides of the top of the frame (21), and a bubble parallel instrument (23) fixedly connected to the outside of the frame (21). The limiting mechanism (3) includes a hook (31) rotatably connected to the frame (21), a second operating rod (32) connected to the hook (31), a positioning bolt (33) fixedly connected to the frame (21), and a tension spring (34) sleeved on the outside of the second operating rod (32) and the positioning bolt (33).

6. The lifting switch trolley according to claim 5, characterized in that: The guide rail (22) is fixedly connected to the limiting head (221).

7. The lifting switch trolley according to claim 5 or 6, characterized in that: The hook (31) includes a hinge plate (311) fixedly connected to the frame (21), a guide plate (312) hinged to the hinge plate (311), a limiting pin (313) fixedly connected inside the guide plate (312), a hook plate (314) slidably connected to the limiting pin (313), and a fixing sleeve (315) fixedly connected to one end of the hook plate (314).

8. The lifting switch trolley according to claim 7, characterized in that: The second operating lever (32) includes a second threaded rod (321) slidably connected inside the frame (21), a third threaded rod (322) threadedly connected to the fixed threaded sleeve (315), a second connecting sleeve (323) for connecting the second threaded rod (321) and the third threaded rod (322), and a movable knob (324) threadedly connected to the outside of the second threaded rod (321).

9. The lifting switch trolley according to claim 8, characterized in that: The second threaded rod (321) is threaded to a limiting nut (325) on its outer side. An elastic element (326) is sleeved on the outer side of the second threaded rod (321). The elastic element (326) is located between the limiting nut (325) and the frame (21).

10. The lifting switch trolley according to claim 8 or 9, characterized in that: It also includes a lifting mechanism (4), which includes a base plate (41), a jack (42) mounted on the top of the base plate (41), an inner sleeve (43) fixedly connected to the top of the base plate (41), an outer sleeve (44) slidably connected to the inner sleeve (43), and a caster wheel (45) mounted on the bottom of the base plate (41). The output end of the jack (42) is fixedly connected to the outer casing (44) and the frame (21).

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