A lifting trolley with adjustable main and auxiliary hook spacing

Abstract

This utility model provides a lifting trolley with adjustable main and auxiliary hook spacing, belonging to the technical field of lifting equipment. The technical solution is as follows: a lifting trolley with adjustable main and auxiliary hook spacing includes a support plate, support wheels mounted on the bottom surface of the support plate, a main trolley fixed on the top surface of the support plate, a main hook mounted on the main trolley, a guide rail fixed on the top surface of the support plate, a support plate above the guide rail, an auxiliary trolley fixed on the top surface of the support plate, an auxiliary hook mounted on the auxiliary trolley, track wheels mounted on the bottom surface of the support plate, track wheels capable of rolling along the guide rail, a rack fixed on the bottom surface of the support plate, the rack having the same length direction as the guide rail, a gear below the rack, the gear meshing with the rack, the gear's drive shaft fixedly connected to the output shaft of a drive motor, and the drive motor fixed on the top surface of the support plate. The beneficial effect of this utility model is that this device can achieve adjustable main and auxiliary hook spacing, effectively avoiding the problem of auxiliary hook disengagement caused by a fixed spacing.

Description

Technical Field

[0001] This utility model belongs to the field of lifting equipment technology, specifically relating to a lifting trolley with adjustable main and auxiliary hook spacing. Background Technology

[0002] In steel smelting, the crane trolley plays a crucial role in lifting and transporting molten steel ladles. The molten steel ladle contains high-temperature molten steel, and its lifting process is not only related to production efficiency but also closely linked to production safety. The crane trolley must precisely and stably lift and tilt the molten steel ladle to accurately pour the molten steel into the designated location; any minor error could lead to a serious production accident. Existing crane trolleys are typically mounted on the bridge frame of a bridge crane, allowing them to move along the frame to perform lifting operations at different locations. A crane trolley generally consists of a main trolley and an auxiliary trolley. The main trolley is primarily responsible for controlling the lifting and lowering of the main hook, which, with its strong load-bearing capacity, steadily lifts a ladle filled with molten steel. The auxiliary trolley, on the other hand, controls the lifting and lowering of the auxiliary hook. In the tipping operation of the molten steel ladle, the auxiliary hook plays a crucial role, pulling on the side lifting lugs of the ladle to cause it to tip over, thus allowing the molten steel to be poured out.

[0003] However, in actual production operations, when the auxiliary hook pulls the molten steel ladle to tilt, the actual distance between the auxiliary hook and the main hook is constantly changing due to the shape of the ladle, its center of gravity distribution, and the mechanical changes during tilting. But the spacing between the main and auxiliary hooks of existing lifting trolleys is fixed in design and cannot be adjusted in real time according to the actual situation during lifting. This makes it difficult for the auxiliary hook to remain vertical while pulling the molten steel ladle. Once the auxiliary hook deviates from the vertical direction, the direction of the pulling force will be off-center, failing to concentrate and stably act on the tilting point of the molten steel ladle. Under this unstable pulling state, the auxiliary hook is prone to disengagement from the molten steel ladle. Utility Model Content

[0004] This invention addresses the problem that the distance between the main and auxiliary hooks of existing crane trolleys is not adjustable, which easily leads to the auxiliary hook disengaging. It provides a crane trolley with an adjustable distance between the main and auxiliary hooks, which makes it less likely for the auxiliary hook to disengage.

[0005] To solve the above problems, the technical solution adopted by this utility model is as follows: a lifting trolley with adjustable main and auxiliary hook spacing, including a support plate, a support wheel installed on the bottom surface of the support plate, a main trolley fixed on the top surface of the support plate, a main hook installed on the main trolley, a guide rail fixed on the top surface of the support plate, a support plate provided above the guide rail, an auxiliary trolley fixed on the top surface of the support plate, an auxiliary hook installed on the auxiliary trolley, a track wheel installed on the bottom surface of the support plate, the track wheel can roll along the guide rail, a rack fixed on the bottom surface of the support plate, the rack being in the same length direction as the guide rail, a gear provided below the rack, the gear meshing with the rack, the transmission shaft of the gear being fixedly connected to the output shaft of a drive motor, and the drive motor being fixed on the top surface of the support plate.

[0006] In this technical solution, a main trolley is fixed to the top surface of a support plate, and a main hook is mounted on the main trolley. A guide rail is also fixed to the top surface of the support plate, and a support plate is positioned above the guide rail. A secondary trolley is fixed to the top surface of the support plate, and a secondary hook is mounted on the secondary trolley. Track wheels are mounted on the bottom surface of the support plate, allowing them to slide along the guide rail. A rack is also fixed to the bottom surface of the support plate, with a gear meshing with it below. The gear's drive shaft is fixedly connected to the output shaft of a drive motor fixed to the top surface of the support plate. During operation, the drive motor controls the gear rotation, driving the rack to move, which in turn moves the support plate along the guide rail, thus adjusting the position of the secondary hook and ultimately achieving adjustable spacing between the main and secondary hooks. Therefore, this device can achieve adjustable spacing between the main and secondary hooks, effectively avoiding the problem of the secondary hook disengaging due to a fixed spacing.

[0007] Furthermore, the guide rail has an I-shaped cross-section, with two parallel guide rails and several track wheels evenly distributed along the two rails. The I-shaped cross-section of the guide rail provides excellent structural mechanical properties; its upper and lower flanges provide stable support surfaces for the track wheels, while the web enhances overall rigidity, effectively dispersing stress, reducing deformation, and ensuring the long-term structural stability of the guide rail. The two parallel guide rails further improve the overall balance and stability of the support. Compared to a single-rail structure, it distributes the load more evenly, preventing the pallet from tilting due to excessive force on one side. This provides a dual-rail guiding reference for the smooth movement of the pallet, reducing swaying or deviation during operation.

[0008] Furthermore, the track wheel has a stepped structure, with the inner rim diameter larger than the outer rim diameter. The outer rim overlaps the top of the guide rail, while the inner rim is fitted with the guide rail with a clearance fit. The outer rim overlapping the top of the guide rail stably supports the weight of the pallet and the upper auxiliary trolley and hook, providing reliable support for the overall structure. The clearance fit between the inner rim and the guide rail does not interfere with the smooth sliding of the track wheel along the guide rail, and also prevents excessive deviation or derailment of the pallet due to slight lateral displacement. Simultaneously, it avoids increased frictional resistance or accelerated component wear that might result from rigid contact. Therefore, while ensuring load-bearing stability and operational guidance, it improves the smoothness of operation and the service life of the device.

[0009] Furthermore, vertically arranged limiting plates are provided on the outer sides of both guide rails. The bottom of the limiting plates is fixedly connected to the top surface of the support plate. Side guide wheels are installed on the bottom surface of the support plate. The side guide wheels are horizontally arranged, and their outer circumferences roll in contact with the limiting plates. The rolling contact between the side guide wheels and the limiting plates actively restrains the lateral displacement of the support plate, transmitting any lateral force that the support plate may generate to the limiting plates through the side guide wheels. This maintains the gap between the inner rim of the track wheel and the guide rail, effectively preventing the inner rim from rubbing or colliding with the guide rail due to the displacement of the support plate.

[0010] Furthermore, a connecting shaft is fixed along the axial direction at the center of the track wheel. The connecting shaft is coaxial with the track wheel, and a deep groove ball bearing is sleeved on the connecting shaft. The outer surface of the connecting shaft is interference-fitted with the inner ring of the deep groove ball bearing, and the outer ring of the deep groove ball bearing is interference-fitted with the support frame. The support frame is fixedly connected to the bottom surface of the pallet. The rolling connection between the track wheel and the support frame via the deep groove ball bearing converts the friction of the track wheel sliding along the guide rail into rolling friction within the bearing, significantly reducing running resistance and making the pallet move more smoothly. The interference fit connection ensures a rigid connection between the connecting shaft, bearing, and support frame, preventing relative loosening or wobbling, ensuring the coaxiality and stability of the track wheel during operation. Simultaneously, the deep groove ball bearing itself has good radial load-bearing capacity, reliably bearing the weight of the pallet and the components above, reducing component wear, extending the service life of the overall structure, and thus ensuring the accuracy and reliability of the auxiliary hook movement adjustment.

[0011] Furthermore, two baffles are fixed on the top surface of the support plate, distributed on both sides of the support plate along the length of the guide rail. When the support plate moves along the guide rail driven by the drive motor, if it approaches the limit of the movement range due to control errors or unexpected situations, the support plate will come into contact with the baffle on the corresponding side, thereby directly preventing the support plate from exceeding the preset stroke. This avoids the auxiliary hook from moving too far and causing excessive distance between itself and the main hook, or from colliding with other components of the device, further ensuring the safety and reliability of the main and auxiliary hook distance adjustment. At the same time, it can also indirectly protect the guide rail, track wheels, and other components from damage caused by overtravel.

[0012] Furthermore, buffer springs are installed on the sides of both baffles near the pallet, with the buffer springs running lengthwise with the guide rail. When the pallet moves to its travel limit and contacts the baffle due to inertia or control errors, the buffer springs will contact the pallet before the baffles, absorbing the impact force through their elastic deformation and preventing rigid impact between the pallet and the baffles. This significantly reduces stress and wear on components such as the pallet, baffles, and guide rails caused by impact, extends the service life of each component, and reduces the risk of equipment failure.

[0013] Furthermore, a connecting plate is fixed on the auxiliary trolley, and the connecting plate has threaded holes. The center line of the threaded holes is in the same direction as the length direction of the guide rail. A servo motor is installed on the main trolley, and the output end of the servo motor is fixedly connected to one end of a lead screw. The other end of the lead screw passes through the threaded hole and engages with the threaded hole. The servo motor can precisely control the rotation angle of the lead screw. Through the threaded transmission between the lead screw and the threaded hole, the rotational motion is stably converted into the linear displacement of the auxiliary trolley, achieving precise control of the displacement. The threaded engagement can eliminate transmission backlash through pre-tightening, avoiding positional lag during reverse movement and ensuring positional consistency during forward and reverse movement. At the same time, the closed-loop control characteristics of the servo motor can correct positional deviations in real time, offsetting the influence of factors such as load changes, so that the actual position of the auxiliary trolley closely matches the target position.

[0014] Furthermore, both the external thread of the lead screw and the internal thread of the lead hole are T-type threads. The tooth profile of the T-type thread is trapezoidal, with a larger tooth crest and root width. The cross-sectional area of ​​the thread teeth is larger than that of ordinary triangular threads, which can withstand greater axial forces. When the auxiliary trolley and the upper components are under heavy loads, the T-type thread can stably transmit driving force and is not prone to thread deformation or damage due to excessive force, thus ensuring the reliability of the transmission.

[0015] Furthermore, the support plate is equipped with a main connecting port and a secondary connecting port. The main connecting port is positioned opposite to the main hook of the main trolley, and the secondary connecting port is positioned opposite to the secondary hook of the secondary trolley. A connecting port is provided on the support plate, positioned opposite to the secondary connecting port. The main connecting port corresponds to the main hook, the secondary connecting port corresponds to the secondary hook, and the connecting port on the support plate is aligned with the secondary connecting port, forming a continuous and precise channel along the movement path of the main and secondary hooks. The main hook can pass directly through the main connecting port, while the secondary hook can pass sequentially through the secondary connecting port and the connecting port, avoiding hook jamming or collisions caused by channel misalignment, and ensuring smooth passage of the main and secondary hooks through various components during lifting and movement.

[0016] As can be seen from the above technical solution, the advantages of this utility model are as follows: In this technical solution, a main trolley is fixedly installed on the top surface of the support plate, and a main hook is installed on the main trolley; at the same time, a guide rail is also fixedly installed on the top surface of the support plate. A support plate is provided above the guide rail, and a secondary trolley is fixedly installed on the top surface of the support plate, with a secondary hook installed on the secondary trolley. A track wheel is installed on the bottom surface of the support plate, and the track wheel can slide along the fixed guide rail. In addition, a rack is fixedly installed on the bottom surface of the support plate, and a gear meshing with it is provided below the rack. The transmission shaft of the gear is fixedly connected to the output shaft of the drive motor fixed on the top surface of the support plate. When the device is working, the drive motor drives the meshing rack to move by controlling the rotation of the gear. The movement of the rack then drives the entire support plate to move along the direction of the guide rail, thereby realizing the position adjustment of the secondary hook installed on the support plate, and ultimately achieving the purpose of adjustable spacing between the main hook and the secondary hook. In summary, this device can realize adjustable spacing between the main and secondary hooks, and can effectively avoid the problem of disengagement of the secondary hook due to fixed spacing. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model; Figure 2 for Figure 1 Enlarged view of a portion of point A in the middle; Figure 3 This is a schematic diagram of the internal structure of a specific embodiment of the present utility model; Figure 4 for Figure 3 Enlarged view of a section at point B in the middle; Figure 5 for Figure 3 Enlarged view of a section at point C; Figure 6 for Figure 3 Enlarged view of a section at point D.

[0019] In the diagram: 1. Support plate; 2. Support wheel; 3. Main trolley; 4. Auxiliary trolley; 5. Guide rail; 6. Support plate; 7. Track wheel; 8. Rack; 9. Gear; 10. Drive motor; 11. Limiting plate; 12. Side guide wheel; 13. Connecting shaft; 14. Deep groove ball bearing; 15. Support frame; 16. Baffle; 17. Buffer spring; 18. Connecting plate; 19. Threaded hole; 20. Servo motor; 21. Lead screw; 22. Main connection port; 23. Auxiliary connection port; 24. Connection port. Detailed Implementation

[0020] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0021] A type of lifting trolley with adjustable main and auxiliary hook spacing, such as Figure 1 As shown, the system includes a support plate 1, on the bottom surface of which a support wheel 2 is mounted. This support wheel 2 can slide on the bridge rails of the bridge crane, allowing the entire crane trolley to move along the bridge rails. A main trolley 3 is bolted to the top surface of the support plate 1, and a main hook is mounted on the main trolley 3. The main hook can be raised and lowered; both the main trolley 3 and the main hook are existing equipment. A guide rail 5 is welded to the top surface of the support plate 1, and a support plate 6 is positioned above the guide rail 5. A secondary trolley 4 is fixedly mounted on the top surface of the support plate 6, and a secondary hook is mounted on the secondary trolley 4. The secondary hook can also be raised and lowered; both the secondary trolley 4 and the secondary hook are existing equipment. A track wheel 7 is mounted on the bottom surface of the support plate 6, and the track wheel 7 can slide along the guide rail 5, thus allowing the support plate 6 and the secondary trolley 4 to move as a whole along the guide rail 5.

[0022] like Figure 3 As shown, in this specific embodiment, a rack 8 is welded to the bottom surface of the pallet 6, and the length direction of the rack 8 is consistent with the length direction of the guide rail 5, as shown. Figure 6 As shown, a gear 9 is provided below the rack 8, and the gear 9 meshes with the rack 8 to form a transmission engagement; the transmission shaft of the gear 9 is fixedly connected to the output shaft of the drive motor 10 through a coupling, while the drive motor 10 is fixedly installed on the top surface of the support plate 1 by bolt connection. The operation of the drive motor 10 can drive the gear 9 to rotate, and then drive the pallet 6 to move through the meshing transmission between the gear 9 and the rack 8.

[0023] In this specific embodiment, the guide rail 5 has an I-shaped cross-section, and there are two guide rails 5 arranged parallel to each other on the top surface of the support plate 1. Four track wheels 7 are provided, evenly distributed on the two guide rails 5, with two track wheels 7 on each guide rail 5. The track wheels 7 have a stepped structure, with the diameter of their inner rim larger than the diameter of their outer rim. The outer rim of the track wheel 7 overlaps the top of the guide rail 5, providing support for the pallet 6 and the components above it. The inner rim of the track wheel 7 has a clearance fit with the guide rail 5 to avoid direct contact and friction.

[0024] like Figure 4 , 5 As shown, a connecting shaft 13 is provided at the center of the track wheel 7 along its own axis, and the connecting shaft 13 is coaxial with the track wheel 7. There are two connecting shafts 13, and the two ends of each connecting shaft 13 are welded to a pair of track wheels 7 on the two guide rails 5 respectively to form an integral structure. Two support frames 15 are also rotatably connected to each connecting shaft 13. The support frames 15 are welded and fixed to the bottom surface of the support plate 6, so that the support plate 6 is connected to the connecting shaft 13 and the track wheel 7 through the support frames 15. Each support frame 15 has a mounting hole, and the connecting shaft 13 passes through the mounting hole. In addition, two deep groove ball bearings 14 are sleeved on each connecting shaft 13. The inner ring of the deep groove ball bearing 14 is interference-fitted with the outer circle of the connecting shaft 13, and the outer ring of the deep groove ball bearing 14 is interference-fitted with the mounting hole on the support frame 15. The rotational fit between the connecting shaft 13 and the support frame 15 is achieved through the deep groove ball bearings 14, ensuring the smooth rolling of the track wheel 7.

[0025] Vertically arranged limiting plates 11 are provided on the outer sides of both guide rails 5. The length direction of the limiting plates 11 is consistent with the length direction of the guide rails 5, and the bottom of the limiting plates 11 is welded to the top surface of the support plate 1. A gap is left between the limiting plates 11 and the support plate 6. Side guide wheels 12 are installed on the bottom surface of the support plate 6. The side guide wheels 12 are horizontally arranged and can rotate around their own axis. There are four side guide wheels 12 in total, which are evenly distributed on both sides of the support plate 6, that is, two on each side of the support plate 6. Among them, the outer circumferential surfaces of the two side guide wheels 12 located on one side of the support plate 6 roll against the limiting plates 11 on that side, and the outer circumferential surfaces of the two side guide wheels 12 located on the other side of the support plate 6 roll against the limiting plates 11 on the other side. The lateral limiting of the support plate 6 is achieved through the cooperation of the side guide wheels 12 and the limiting plates 11.

[0026] A baffle 16 is welded to the top surface of the support plate 1. In this embodiment, there are two baffles 16, which are distributed on both sides of the support plate 6 along the length direction of the guide rail 5. A buffer spring 17 is welded to the side of the two baffles 16 near the support plate 6. The length direction of the buffer spring 17 is consistent with the length direction of the guide rail 5, and it is used to buffer when the support plate 6 moves to the limit position.

[0027] like Figure 2 As shown, in this specific embodiment, a connecting plate 18 is welded onto the auxiliary trolley 4, and a threaded hole 19 is provided on the connecting plate 18. The center line of the threaded hole 19 is aligned with the length direction of the guide rail 5. A servo motor 20 is fixedly mounted on the main trolley 3 by bolts. The output end of the servo motor 20 is fixedly connected to one end of the lead screw 21 via a coupling. The other end of the lead screw 21 passes through the threaded hole 19 on the connecting plate 18, and the external thread of the lead screw 21 and the internal thread of the threaded hole 19 are mutually engaged. Both the external thread of the lead screw 21 and the internal thread of the threaded hole 19 are T-type threads. The servo motor 20 drives the lead screw 21 to rotate, thereby moving the auxiliary trolley 4 and the support plate 6 along the direction of the guide rail 5.

[0028] In this specific embodiment, the support plate 1 is provided with a main connecting port 22 and a secondary connecting port 23. The main connecting port 22 corresponds to the position of the main hook on the main trolley 3, and the main hook can be raised and lowered through the main connecting port 22. The secondary connecting port 23 corresponds to the position of the secondary hook on the secondary trolley 4. The pallet 6 is provided with a connecting port 24, which corresponds to the position of the secondary connecting port 23. The secondary hook can be raised and lowered sequentially through the connecting port 24 on the pallet 6 and the secondary connecting port 23 on the support plate 1, ensuring that the raising and lowering of the main hook and the secondary hook are not obstructed by the support plate 1 and the pallet 6.

[0029] The specific usage process of this utility model is as follows: First, the entire lifting trolley is moved along the bridge rail of the bridge crane to the position directly above the ladle of molten steel to be lifted by the support wheels 2 at its bottom, ensuring that the main hook and the auxiliary hook can be accurately aligned with the lifting point of the ladle of molten steel. Subsequently, the drive motor 10 fixed on the top surface of the support plate 1 is started. The output shaft of the drive motor 10 drives the gear 9 to rotate through the coupling. Since the gear 9 meshes with the rack 8 welded to the bottom surface of the pallet 6, the rotational motion of the gear 9 is converted into the linear motion of the rack 8, which in turn drives the pallet 6 to move along the guide rail 5 on the top surface of the support plate 1. During this process, the track wheel 7 installed on the bottom surface of the pallet 6 rolls along the top of the I-shaped guide rail 5, providing support for the movement of the pallet 6. At the same time, the side guide wheel 12 arranged horizontally on the bottom surface of the pallet 6 rolls along the vertical limiting plate 11 on the outer side of the guide rail 5. The side guide wheel 12 and the limiting plate 11 roll and adhere to the pallet 6 to perform lateral positioning, effectively preventing the pallet 6 from shifting laterally during the movement and avoiding the inner rim of the track wheel 7 from being squeezed or rubbed against the guide rail 5. When the auxiliary trolley 4 on the pallet 6 moves with the pallet 6 to the predetermined position corresponding to the side lifting lug of the molten steel ladle, the drive motor 10 is turned off, and the positions of the pallet 6 and the auxiliary trolley 4 are temporarily fixed.

[0030] Next, the main hook on the main trolley 3 is lowered to precisely hook onto the main lifting lug on top of the molten steel ladle. Then, the main hook is raised to smoothly lift the ladle filled with molten steel. Simultaneously, the auxiliary hook on the secondary trolley 4 is lowered to accurately hook onto the lifting lug on the side of the ladle. Through the coordinated action of the main and auxiliary hooks, stable traction is provided to the ladle from different positions, reducing the swaying caused by inertia during lifting and movement. Afterward, the entire crane trolley is moved along the bridge rail via the support wheels 2 at the bottom, transferring the molten steel ladle to the designated tilting position. Upon reaching the designated position, the servo motor 20 fixed on the main trolley 3 is activated. The output of the servo motor 20 drives the lead screw 21 to rotate via a coupling. Since the lead screw 21 and the threaded hole 19 of the connecting plate 18 on the auxiliary trolley 4 form a T-shaped thread engagement, the rotational motion of the lead screw 21 is converted into the linear motion of the auxiliary trolley 4 along the top surface of the support plate 6. Through the precise control of the rotation angle of the lead screw 21 by the servo motor 20, the moving distance of the auxiliary trolley 4 can be precisely adjusted, thereby precisely controlling the position of the auxiliary hook. This allows the auxiliary hook to stably pull the lifting lug on the side of the molten steel ladle. While the main hook maintains the overall suspension of the molten steel ladle, the pulling force of the auxiliary hook causes the molten steel ladle to produce a controllable tilting action, thereby smoothly pouring the molten steel into the designated container.

[0031] As can be seen from the above embodiments, the beneficial effects of this utility model are as follows: In this specific embodiment, a main trolley is fixedly installed on the top surface of the support plate, and a main hook is installed on the main trolley; at the same time, a guide rail is also fixedly installed on the top surface of the support plate. A support plate is provided above the guide rail, and a secondary trolley is fixedly installed on the top surface of the support plate, with a secondary hook installed on the secondary trolley. A track wheel is installed on the bottom surface of the support plate, and the track wheel can slide along the fixed guide rail. In addition, a rack is fixedly installed on the bottom surface of the support plate, and a gear meshing with it is provided below the rack. The transmission shaft of the gear is fixedly connected to the output shaft of the drive motor fixed on the top surface of the support plate. When the device is working, the drive motor drives the meshing rack to move by controlling the rotation of the gear. The movement of the rack then drives the entire support plate to move along the direction of the guide rail, thereby realizing the position adjustment of the secondary hook installed on the support plate, and ultimately achieving the purpose of adjustable spacing between the main hook and the secondary hook. In summary, this device can realize adjustable spacing between the main and secondary hooks, and can effectively avoid the problem of disengagement of the secondary hook due to fixed spacing.

[0032] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A lifting trolley with adjustable main and auxiliary hook spacing, comprising a support plate (1), a support wheel (2) mounted on the bottom surface of the support plate (1), a main trolley (3) fixed on the top surface of the support plate (1), and a main hook mounted on the main trolley (3), characterized in that, A guide rail (5) is fixed on the top surface of the support plate (1). A support plate (6) is set above the guide rail (5). A secondary trolley (4) is fixed on the top surface of the support plate (6). A secondary hook is installed on the secondary trolley (4). A track wheel (7) is installed on the bottom surface of the support plate (6). The track wheel (7) can roll along the guide rail (5). A rack (8) is fixed on the bottom surface of the support plate (6). The rack (8) is in the same length direction as the guide rail (5). A gear (9) is set below the rack (8). The gear (9) meshes with the rack (8). The transmission shaft of the gear (9) is fixedly connected to the output shaft of the drive motor (10). The drive motor (10) is fixed on the top surface of the support plate (1).

2. The lifting trolley with adjustable main and auxiliary hook spacing according to claim 1, characterized in that, The cross section of the guide rail (5) is I-shaped. There are two guide rails (5), and the two guide rails (5) are parallel to each other. There are several track wheels (7), and the track wheels (7) are evenly distributed on the two guide rails (5).

3. The lifting trolley with adjustable main and auxiliary hook spacing according to claim 2, characterized in that, The track wheel (7) has a stepped structure. The inner rim diameter of the track wheel (7) is larger than the outer rim diameter. The outer rim of the track wheel (7) overlaps the top of the guide rail (5). The inner rim of the track wheel (7) and the guide rail (5) are fitted with a clearance.

4. The lifting trolley with adjustable main and auxiliary hook spacing according to claim 3, characterized in that, The outer sides of the two guide rails (5) are provided with vertically arranged limiting plates (11). The bottom of the limiting plates (11) is fixedly connected to the top surface of the support plate (1). The bottom surface of the support plate (6) is equipped with a side guide wheel (12). The side guide wheel (12) is arranged horizontally, and the outer circumference of the side guide wheel (12) rolls and fits against the limiting plate (11).

5. The lifting trolley with adjustable main and auxiliary hook spacing according to claim 2, characterized in that, A connecting shaft (13) is fixed at the center of the track wheel (7) along the axial direction. The connecting shaft (13) is coaxial with the track wheel (7). A deep groove ball bearing (14) is sleeved on the connecting shaft (13). The outer circle of the connecting shaft (13) is interference-fitted with the inner ring of the deep groove ball bearing (14). The outer ring of the deep groove ball bearing (14) is interference-fitted with the support frame (15). The support frame (15) is fixedly connected to the bottom surface of the support plate (6).

6. The lifting trolley with adjustable main and auxiliary hook spacing according to claim 2, characterized in that, There are two baffles (16) fixed on the top surface of the support plate (1). The two baffles (16) are distributed on both sides of the support plate (6) along the length of the guide rail (5).

7. The lifting trolley with adjustable main and auxiliary hook spacing according to claim 6, characterized in that, Both baffles (16) are equipped with buffer springs (17) on the side near the support plate (6), and the buffer springs (17) are in the same direction as the guide rail (5).

8. The lifting trolley with adjustable main and auxiliary hook spacing according to claim 1, characterized in that, A connecting plate (18) is fixed on the auxiliary trolley (4). A threaded hole (19) is provided on the connecting plate (18). The center line of the threaded hole (19) is in the same direction as the length of the guide rail (5). A servo motor (20) is installed on the main trolley (3). The output end of the servo motor (20) is fixedly connected to one end of the lead screw (21). The other end of the lead screw (21) passes through the threaded hole (19) and is threaded into the threaded hole (19).

9. The lifting trolley with adjustable main and auxiliary hook spacing according to claim 8, characterized in that, The external thread of the lead screw (21) and the internal thread of the lead hole (19) are both T-type threads.

10. The lifting trolley with adjustable main and auxiliary hook spacing according to claim 1, characterized in that, The support plate (1) is provided with a main connection port (22) and a secondary connection port (23). The main connection port (22) is opposite to the main hook of the main trolley (3), and the secondary connection port (23) is opposite to the secondary hook of the secondary trolley (4). The pallet (6) is provided with a connection port (24), and the connection port (24) is opposite to the secondary connection port (23).

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