Cart traveling mechanism

Abstract

The utility model provides a cart traveling mechanism which comprises a first balance beam, a second balance beam, a second balance beam and a third balance beam, the first balance beam is provided with a first pin shaft and a first balance beam jacking point, and the first balance beam jacking point is located below the first pin shaft correspondingly; each second balance beam is provided with a second balance beam jacking point; the two third balance beams are in one-to-one correspondence with the second balance beams, each third balance beam is connected with the bottom of the corresponding second balance beam through a third pin shaft, and each third balance beam is provided with a third balance beam jacking point; and each second balance beam and each third balance beam are respectively connected with at least one trolley through fourth pin shafts, and each trolley is provided with a trolley jacking point. The shore bridge crane traveling mechanism jacking device can realize on-site maintenance, is high in flexibility, is favorable for adapting to different maintenance requirements, reduces the restriction of environmental factors on jacking maintenance of a shore bridge crane traveling mechanism, and improves the maintenance safety.

Description

Technical Field

[0001] The utility model relates to the technical field of quay container cranes, in particular to a trolley traveling mechanism. Background Art

[0002] When the trolley traveling mechanism of the existing quay container crane (referred to as quay crane) is repaired and jacked up, a jacking mechanism is generally used to jack up directly below the pin shaft of the large balance beam of the trolley traveling mechanism, or directly below the pin shaft of the small balance beam of the trolley traveling mechanism, thereby lifting the trolley of one corner or half a corner of the quay crane as a whole to perform some maintenance and replacement work.

[0003] However, the existing jacking method requires towing the quay crane to be maintained to a dedicated maintenance station at the dock for operation, with high requirements for the jacking and maintenance working conditions, large jacking workload, high safety plan requirements, and is only suitable for use during large-scale maintenance and replacement work, lacking flexibility and unable to meet different maintenance needs. For example, for the replacement of wheel bearings and other work that occurs during the maintenance of the trolley traveling mechanism of the quay crane, the maintenance workload is small. At this time, towing the quay crane to a dedicated maintenance station at the dock for repair and jacking increases the transportation cost and time consumption, and the overall jacking and maintenance process takes a long time, resulting in a long maintenance cycle.

[0004] In addition, during the overall jacking process of the trolley traveling mechanism of the quay crane, high requirements are imposed on the stability of the overall structure. If the structure is unbalanced, it is easy to cause safety accidents, and due to environmental factors such as strong winds in bad weather, the maintenance work may not be carried out in a timely manner, increasing the safety risks during the maintenance process. Summary of the Utility Model

[0005] In view of this, the utility model provides a trolley traveling mechanism, which can achieve on-site repair, has high flexibility, helps to meet different maintenance needs, reduces the restriction of environmental factors on the jacking and maintenance of the trolley traveling mechanism of the quay crane, and improves the safety of maintenance.

[0006] To solve at least one of the above technical problems, the utility model adopts the following technical solutions:

[0007] The trolley traveling mechanism according to an embodiment of the utility model includes:

[0008] A first balance beam, on which a first pin shaft and a first balance beam jacking point are provided. The first pin shaft is used for connecting with the door frame of the crane, and the first balance beam jacking point is located directly below the corresponding first pin shaft;

[0009] A pair of second balance beams, one second balance beam is connected to the bottom of each end of the first balance beam through a second pin shaft, and each second balance beam is provided with a second balance beam jacking point;

[0010] Two third balance beams, the third balance beams corresponding to the second balance beams one by one. The bottom of each third balance beam is connected to its corresponding second balance beam by a third pin shaft, and a third balance beam lifting point is provided on each third balance beam;

[0011] A plurality of bogies, each second balance beam and each third balance beam are respectively connected to at least one bogie by a fourth pin shaft, and a bogie lifting point is provided on each bogie.

[0012] Further, bogie lifting points are respectively provided on both sides of the frame of each bogie, and the respective bogie lifting points on each bogie are at the same horizontal height and are located at the lower end of the frame.

[0013] Further, a first lifting assembly is provided at each bogie lifting point, and the first lifting assembly includes:

[0014] A first shear plate, the first shear plate being provided on the corresponding frame;

[0015] A first limiting assembly, the first limiting assembly being provided on the lower surface of the first shear plate, and the first limiting assembly being used for limiting the corresponding lifting mechanism;

[0016] A first support rib plate, the first support rib plate being provided on the upper surface of the first shear plate and connecting to the corresponding frame.

[0017] Further, the first limiting assembly includes two first stoppers, the two first stoppers being symmetrically provided on the lower surface of the first shear plate, and a limiting interval being formed between the two first stoppers.

[0018] Further, the second balance beam lifting point is a boss structure at the bottom of the second balance beam.

[0019] Further, one end of each second balance beam is connected to its corresponding third balance beam by a third pin shaft, the other end of each second balance beam is connected to a bogie by a fifth pin shaft, one end of each third balance beam is connected to its corresponding bogie by a fourth pin shaft, and a traveling wheel is provided at the other end of each third balance beam.

[0020] Further, each third balance beam lifting point includes:

[0021] A third balance beam high lifting point, the third balance beam high lifting point being located at one end of the third balance beam close to its corresponding fourth pin shaft;

[0022] A third balance beam middle lifting point, the third balance beam middle lifting point being located at one end of the third balance beam far from the third balance beam high lifting point and being located above the corresponding traveling wheel;

[0023] Multiple third balance beam low jacking points are located below the middle jacking points of the third balance beam and on both lower ends of the traveling wheels. Each of the third balance beam low jacking points on each third balance beam is at the same horizontal height.

[0024] Furthermore, both the middle jacking points and the high jacking points of the third balance beam are formed into groove structures that are easy to place the lifting cross beam.

[0025] Furthermore, a second jacking assembly is provided at each third balance beam low jacking point. The second jacking assembly includes:

[0026] A second shear plate is provided at the lower end of the third balance beam.

[0027] A second limiting assembly is provided on the lower surface of the second shear plate. The second limiting assembly is used to limit the corresponding jacking mechanism.

[0028] A second support rib plate is provided on the upper surface of the second shear plate and is connected to the third balance beam.

[0029] Furthermore, the second limiting assembly includes two second stoppers. The two second stoppers are symmetrically arranged on the lower surface of the second shear plate, and a limiting interval is formed between the two second stoppers.

[0030] At least one of the above technical solutions of the present utility model has the following beneficial effects:

[0031] According to a traveling mechanism for a large vehicle with multi-level jacking points of the present utility model, by jacking the first balance beam jacking point, the cushion beam is placed under the first balance beam jacking point of the traveling mechanism of the quay crane, thereby lifting one corner of the traveling mechanism of the quay crane, and then the traveling mechanism of the quay crane can be integrally jacked up, facilitating large-scale maintenance and replacement work, such as the inspection and replacement of the first pin shaft, or the replacement of each balance beam or pin shaft of the traveling mechanism of the large vehicle as a whole. By jacking the second balance beam jacking point, the overhaul and maintenance of each structure and component at the lower level of the second balance beam can be realized. By jacking the third balance beam jacking point, the overhaul and maintenance of each structure and component at the lower level of the third balance beam can be realized. By jacking the trolley jacking point, the inspection and replacement of the trolley wheels or bearings can be realized.

[0032] Specifically, the trolley traveling mechanism provided by the present utility model sets different jacking points on the first balance beam, the second balance beam, the third balance beam and the trolley. When components at different positions need to be repaired, the position to be repaired can be jacked up separately (i.e., locally jack up the trolley traveling mechanism) to release the pressure of the components at that position. For example, directly jack up the wheels or other components to be maintained on-site, without having to move the entire quay crane trolley to a specific repair area. This can greatly save time and cost, and reduce the additional risks caused by moving the quay crane trolley. For example, if the bearing of a certain wheel needs to be replaced, only need to use a jack combined with a backing plate to jack up the jacking point of the trolley. The required tools are simple and easy to obtain, and it will not affect other parts of the trolley structure. By adopting this local jacking method, the repair speed can be significantly increased, enabling the repair work to be completed faster and reducing the downtime.

[0033] In addition, since local jacking can be achieved, the risk of the entire structure losing balance is also reduced, improving the safety of the repair process. It reduces the influence of external environmental factors such as weather and lowers the maintenance cost. Brief Description of the Drawings

[0034] Figure 1 Schematic diagram of the jacking position of the trolley traveling mechanism according to an embodiment of the present utility model;

[0035] Figure 2 Schematic diagram of the jacking position of the trolley according to an embodiment of the present utility model;

[0036] Figure 3 Side view of the jacking position of the trolley according to an embodiment of the present utility model;

[0037] Figure 4 Top view of the jacking position of the trolley according to an embodiment of the present utility model;

[0038] Figure 5 Schematic diagram of the jacking position of the third balance beam according to an embodiment of the present utility model;

[0039] Figure 6 Top view of the jacking position of the third balance beam according to an embodiment of the present utility model;

[0040] Figure 7 Another schematic diagram of the jacking position of the third balance beam according to an embodiment of the present utility model.

[0041] Reference numerals: 1. First balance beam jacking point; 2. Second balance beam jacking point; 3. Third balance beam high jacking point; 4. Third balance beam middle jacking point; 5. Third balance beam low jacking point; 6. Trolley jacking point; 7. First pin shaft; 8. Second pin shaft; 9. Third pin shaft; 10. Fourth pin shaft; 11. First jacking assembly; 111. First shear plate; 112. First limiting assembly; 113. First support rib plate; 1121. First stop block; 12. Second jacking assembly; 121. Second shear plate; 122. Second limiting assembly; 123. Second support rib plate;

[0042] 100. First balance beam; 200. Second balance beam; 300. Third balance beam; 400. Trolley; 500. Traveling wheel; 600. Jacking mechanism. Detailed implementation manners

[0043] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention fall within the scope of protection of the present invention.

[0044] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those of ordinary skill in the art to which the present invention belongs. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, the terms such as "a" or "one" do not denote a quantity limitation, but mean that there is at least one. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships will also change accordingly.

[0045] First, the traveling mechanism of the large vehicle according to the embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

[0046] Specifically, as Figures 1 to 7 shown, the traveling mechanism of the large vehicle according to the embodiments of the present invention may include: a first balance beam 100, a pair of second balance beams 200, two third balance beams 300, and a plurality of trolleys 400.

[0047] Among them, a first pin shaft 7 and a first balance beam jacking point 1 are provided on the first balance beam 100. The first pin shaft 7 is used for connecting with the door frame of the crane, and the first balance beam jacking point 1 is located below the corresponding first pin shaft 7. At the bottoms of both ends of the first balance beam 100, a second balance beam 200 is connected through a second pin shaft 8 respectively, and a second balance beam jacking point 2 is provided on each second balance beam 200. The third balance beams 300 correspond to the second balance beams 200 one by one. The bottom of each third balance beam 300 is connected with its corresponding second balance beam 200 through a third pin shaft 9, and a third balance beam jacking point is provided on each third balance beam 300. Each second balance beam 200 and each third balance beam 300 are respectively connected with at least one trolley 400 through a fourth pin shaft 10, and a trolley jacking point 6 is provided on each trolley 400.

[0048] Specifically, for a trolley traveling mechanism with multi-level jacking points of the present utility model, by jacking the first balance beam jacking point 1, a cushion beam is placed under the first balance beam jacking point 1 of the trolley traveling mechanism of the quay crane, so as to lift one corner of the trolley traveling mechanism of the quay crane, and then the trolley traveling mechanism of the quay crane can be integrally jacked up, which is convenient for large-scale maintenance and replacement work, such as the overhaul and replacement of the first pin shaft 7, or the replacement of each balance beam or pin shaft of the trolley traveling mechanism as a whole. By jacking the second balance beam jacking point 2, the overhaul and maintenance of each structure and component at the lower level of the second balance beam 200 can be realized. By jacking the third balance beam jacking point, the overhaul and maintenance of each structure and component at the lower level of the third balance beam 300 can be realized. By jacking the trolley jacking point 6, the overhaul and replacement of the wheels or bearings of the trolley 400 can be realized.

[0049] That is to say, the trolley traveling mechanism provided by the present utility model is respectively provided with different jacking points on the first balance beam 100, the second balance beam 200, the third balance beam 300 and the trolley 400. When components at different positions need to be repaired, the position to be repaired can be jacked up separately (i.e., the trolley traveling mechanism is locally jacked up) to release the pressure of the components at that position. For example, the wheels or other components to be maintained can be directly jacked up on site, without the need to move the whole trolley of the quay crane to a specific maintenance area. This can greatly save time and cost, and reduce the additional risks caused by moving the trolley of the quay crane. For example, if the bearing of a certain wheel needs to be replaced, only the trolley jacking point 6 needs to be jacked up by using a jack in combination with a cushion plate. The required tools are simple and easy to obtain, and it will not affect other parts of the trolley structure. By adopting this local jacking method, the repair speed can be significantly accelerated, enabling the repair work to be completed faster and reducing the downtime.

[0050] In addition, since local jacking can be achieved, the risk of imbalance of the entire structure is also reduced, and the safety during the maintenance process is improved. The influence of external environmental factors such as weather is alleviated, and the maintenance cost is reduced.

[0051] In some embodiments of the present utility model, as Figures 1 to 4 shown, on both sides of the frame of each trolley 400, trolley jacking points 6 are respectively provided, and the trolley jacking points 6 on each trolley 400 are located at the same horizontal height and at the lower end of the frame.

[0052] That is to say, by providing the trolley jacking points 6 at the same horizontal height on both sides of the trolley 400 frame, the jacking force can be ensured to be evenly distributed, the situation of excessive local stress is reduced, and the stability during the jacking process is improved. Moreover, the trolley jacking points 6 are arranged at the lower end of the trolley 400 frame, which is convenient for arranging corresponding jacking tools and improves the simplicity of operation.

[0053] In some embodiments of the present utility model, as Figures 1 to 4 shown, one, two or more trolley jacking points 6 can be respectively provided on both sides of the frame of each trolley 400, and the present application does not specifically limit the number of trolley jacking points 6. At each trolley jacking point 6, a first jacking assembly 11 is provided, and the first jacking assembly 11 includes: a first shear plate 111, a first limiting assembly 112 and a first support rib plate 113.

[0054] Among them, the first shear plate 111 is arranged on the corresponding frame to bear the jacking force. The first limiting assembly 112 is arranged on the lower surface of the first shear plate 111, and the first limiting assembly 112 is used for limiting the corresponding jacking mechanism 600. The first support rib plate 113 is arranged on the upper surface of the first shear plate 111 and connected to the corresponding frame to enhance the stability of the shear plate.

[0055] Here, it should be supplemented that since there may be other mechanisms or components on one side of the trolley 400 frame, such as a braking device, etc., the weights of the frames on both sides of the trolley 400 are unbalanced. Thus, as Figure 4 shown, the first jacking assemblies 11 on both sides of the trolley 400 can be arranged staggeredly with respect to the center line L1 of the trolley bottom to achieve stability during jacking.

[0056] In some embodiments of the present utility model, as Figures 2 to 4As shown, the first limiting component 112 includes two first stoppers 1121. The two first stoppers 1121 are symmetrically arranged on the lower surface of the first shear plate 111, and a limiting interval is formed between the two first stoppers 1121. Thus, during the jacking process, the jacking end of the jack enters the limiting interval formed by the two first stoppers 1121, preventing the jack from sliding or shifting during the jacking process. The operation is simple, the stability during the jacking process is improved, and the safety risk is reduced.

[0057] The following combines Figures 1 to 4 Briefly describe the working process of the jacking mechanism 600 for jacking the jacking point 6 of the trolley:

[0058] After the operator checks that the traveling track of the trolley is flat and free of debris, a backing plate (such as a thick steel plate) is laid on the track to ensure its stable placement. Jacks are respectively placed on the backing plates below the jacking points on both sides, and then the heights of the two jacks are adjusted using the backing plates so that the jacking ends of the jacks below the corresponding jacking points enter the limiting interval formed by the two first stoppers 1121. Then, the jacks on both sides are simultaneously driven to jack the first shear plates 111 on both sides of the frame of the trolley 400, thereby jacking a single trolley 400. After jacking in place, observe whether the trolley 400 is separated from the track to ensure that the wheels of the trolley 400 are no longer stressed. Thereafter, inspection, repair or replacement of parts of the trolley 400 is carried out. After the repair is completed, the jacks are slowly lowered synchronously to reset the trolley 400.

[0059] In some embodiments of the present invention, as Figure 1 shown, one end of each second balance beam 200 is connected to its corresponding third balance beam 300 through a third pin 9, and the other end of each second balance beam 200 is connected to a trolley 400 through a fifth pin (not shown). One end of each third balance beam 300 is connected to its corresponding trolley 400 through a fourth pin 10, and the other end of each third balance beam 300 is provided with a traveling wheel 500. Thus, while ensuring the compact structure of the trolley traveling mechanism of the quay crane, the stability of the structure is improved.

[0060] In some embodiments of the present invention, as Figure 1 、 Figure 7 shown, the second balance beam jacking point 2 is a convex platform structure at the bottom of the second balance beam 200.

[0061] As Figure 1 、 Figure 7 shown, the second balance beam jacking point 2 is a convex platform structure at the bottom of the second balance beam 200. By placing a lifting cross beam between this point and the frame of the trolley 400, when the structure above the wheels needs to be inspected or repaired, by jacking the lifting cross beam at the second balance beam jacking point 2, a zero-force state of the structure below the fifth pin can be achieved.

[0062] In some embodiments of the present utility model, such as Figure 1 , Figures 5 to 7 shown, each third balance beam lifting point includes: a third balance beam high lifting point 3, a third balance beam middle lifting point 4, and a plurality of third balance beam low lifting points 5.

[0063] Among them, the third balance beam high lifting point 3 is located at one end of the third balance beam 300 close to its corresponding fourth pin 10. The third balance beam middle lifting point 4 is located at the end of the third balance beam 300 away from the third balance beam high lifting point 3 and above the corresponding traveling wheel 500. The plurality of third balance beam low lifting points 5 are located below the third balance beam middle lifting point 4 and distributed at the lower ends on both sides of the traveling wheel 500, and the respective third balance beam low lifting points 5 on each third balance beam 300 are at the same horizontal height.

[0064] Specifically, as Figure 1 , Figures 5 to 7 shown, the third balance beam high lifting point 3 is located at one end of the third balance beam 300 close to its corresponding fourth pin 10. When the whole trolley 400 connected to the end of the third balance beam 300 close to its corresponding fourth pin 10 needs to be replaced, or when checking and replacing the fourth pin 10, by jacking up the third balance beam high lifting point 3 with a jacking device, a zero-force state of the fourth pin 10 and the structure below the fourth pin 10 (i.e., the trolley 400 structure close to the fourth pin 10) can be achieved.

[0065] Similarly, when it is necessary to check the structure of the third balance beam 300 below the third balance beam middle lifting point 4, jack up the third balance beam middle lifting point 4, and a zero-force state of the structure below the third balance beam middle lifting point 4 can be achieved. When it is necessary to check and replace the traveling wheel 500 alone, jack up the third balance beam low lifting point 5.

[0066] Similarly, the plurality of third balance beam low lifting points 5 are located below the third balance beam middle lifting point 4 and distributed at the lower ends on both sides of the traveling wheel 500, and the respective third balance beam low lifting points 5 on each third balance beam 300 are at the same horizontal height. When it is necessary to jack up the third balance beam low lifting point 5, small jacks are placed on a backing plate (such as a thick steel plate) laid flat on the track to ensure stable placement. Jacks are placed on the backing plate respectively below the lifting points on both sides, and then the heights of the two jacks are adjusted through the backing plate, and then the third balance beam low lifting point 5 is jacked up by the jacks to release the pressure on the traveling wheel 500 connected to the third balance beam 300.

[0067] In some embodiments of the present utility model, such as Figure 1 , Figures 5 to 7As shown, the jacking point 4 and the high jacking point 3 of the third balance beam are both formed with a groove structure that is easy to place the lifting cross beam. The lifting cross beam can be, for example, an I-beam.

[0068] As Figures 5 to 7 shown, both the jacking point 4 and the high jacking point 3 of the third balance beam are formed with a groove structure that is easy to place the lifting cross beam. On the one hand, such a groove structure can limit the lifting cross beam to prevent it from shifting during the lifting process, improving the stability and safety during the jacking process. On the other hand, there is no need to tow the quay crane trolley traveling mechanism to a dedicated maintenance station. The lifting cross beam and the corresponding jacking device can be placed to achieve on-site maintenance, reducing the waiting time and improving the work efficiency.

[0069] In some embodiments of the present utility model, as Figures 5 to 7 shown, a second jacking assembly 12 is provided at each low jacking point 5 of the third balance beam. The second jacking assembly 12 includes: a second shear plate 121, a second limiting assembly 122, and a second support rib plate 123.

[0070] Among them, the second shear plate 121 is provided at the lower end of the third balance beam 300 for bearing the jacking force. The second limiting assembly 122 is provided on the lower surface of the second shear plate 121, and the second limiting assembly 122 is used to limit the corresponding jacking mechanism 600. The second support rib plate 123 is provided on the upper surface of the second shear plate 121 and is connected to the third balance beam 300 for enhancing the stability of the shear plate.

[0071] In some embodiments of the present utility model, as Figures 5 to 7 shown, the second limiting assembly 122 includes two second stoppers (not shown). The two second stoppers are symmetrically arranged on the lower surface of the second shear plate 121, and a limiting interval is formed between the two second stoppers. Thus, during the jacking process, the jacking end of the jack enters the limiting interval formed by the two second stoppers, preventing the jack from sliding or shifting during the jacking process, with simple operation, improving the stability during the jacking process, and reducing the safety risk.

[0072] Similarly, the working process of the jacking mechanism 600 jacking the low jacking point 5 of the third balance beam is briefly described below with reference to Figures 5 to 7 :

[0073] After the operator checks that the gantry traveling track is flat and free of debris, a backing plate (such as a thick steel plate) is laid on the track to ensure its stable placement. Jacks are respectively placed below the low jacking points 5 of the third balance beam on both sides of the traveling wheel 500. The jacks are placed on the backing plate, and then the height of the two jacks is adjusted using the backing plate so that the jacking ends of the jacks enter the limiting interval formed by the two second stoppers. Then, the jacks on both sides are simultaneously driven to synchronously jack up the second shear plates 121 on both sides of the frame of the traveling wheel 500, thereby jacking up a single traveling wheel 500. After jacking up to the required position, observe whether the traveling wheel 500 is separated from the track to ensure that the traveling wheel 500 is no longer stressed. Thereafter, inspection, repair or replacement of components of the traveling wheel 500 is carried out. After the repair is completed, the jacks are slowly lowered synchronously to reset the traveling wheel 500.

[0074] Based on the above embodiments of the present invention, without explicit negation or conflict, the technical features of one embodiment can be beneficially combined with one or more other embodiments.

[0075] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A traveling mechanism for a large vehicle, characterized in that: include: A first balance beam, wherein a first pin shaft and a first balance beam lifting point are provided on the first balance beam, wherein the first pin shaft is used to be connected to a door frame of the crane, and the first balance beam lifting point is located below the first pin shaft; A pair of second balance beams, wherein the bottoms of both ends of the first balance beam are respectively connected to a second balance beam through a second pin shaft, and each of the second balance beams is provided with a second balance beam lifting point; Two third balance beams, the third balance beams corresponding to the second balance beams one by one, each of the third balance beams is connected to the bottom of the corresponding second balance beam via a third pin shaft, and each of the third balance beams is provided with a third balance beam lifting point; A plurality of trolleys, each of the second balance beams and each of the third balance beams is respectively connected to at least one of the trolleys via a fourth pin shaft, and each of the trolleys is provided with a trolley lifting point.

2. The traveling mechanism of the trolley according to claim 1, characterized in that: The trolley lifting points are respectively arranged on both sides of the frame of each trolley, and the trolley lifting points on each trolley are located at the same horizontal height and at the lower end of the frame.

3. The traveling mechanism of the trolley according to claim 2, characterized in that: A first lifting assembly is provided at each trolley lifting point, and the first lifting assembly comprises: A first anti-shear plate, wherein the first anti-shear plate is arranged on the vehicle frame corresponding thereto; A first limiting component, which is arranged on the lower surface of the first anti-shear plate and is used to limit the corresponding jacking mechanism; A first supporting rib is disposed on an upper surface of the first anti-shear plate and connected to the vehicle frame corresponding thereto.

4. The traveling mechanism of the trolley according to claim 3, characterized in that: The first limiting assembly includes two first blocks, which are symmetrically arranged on the lower surface of the first anti-shear plate, and a limiting interval is formed between the two first blocks.

5. The traveling mechanism of the trolley according to claim 1, characterized in that: The lifting point of the second balance beam is a boss structure at the bottom of the second balance beam.

6. The traveling mechanism of the trolley according to claim 1, characterized in that: One end of each of the second balance beams is connected to the corresponding third balance beam via the third pin shaft, the other end of each of the second balance beams is connected to one of the trolleys via the fifth pin shaft, one end of each of the third balance beams is connected to the corresponding trolley via the fourth pin shaft, and the other end of each of the third balance beams is provided with a traveling wheel.

7. The traveling mechanism of the trolley according to claim 6, characterized in that: Each of the third balance beam lifting points comprises: A third balance beam high lifting point, the third balance beam high lifting point is located at one end of the third balance beam close to the fourth pin corresponding thereto; A jacking point in the middle of the third balance beam, the jacking point in the middle of the third balance beam is located at one end of the third balance beam away from the high jacking point of the third balance beam and is located above the corresponding traveling wheel; A plurality of third balance beam low lifting points are located below the lifting point in the third balance beam and are distributed at the lower ends of both sides of the traveling wheels, and each of the third balance beam low lifting points on each third balance beam is located at the same horizontal height.

8. The traveling mechanism of the trolley according to claim 7, characterized in that: The middle lifting point of the third balance beam and the high lifting point of the third balance beam are both formed into a groove structure for accommodating the lifting beam.

9. The traveling mechanism of the trolley according to claim 7, characterized in that: A second jacking assembly is provided at the low jacking point of each third balance beam, and the second jacking assembly comprises: a second shear plate, the second shear plate being arranged at a lower end of the third balance beam; A second limiting assembly, the second limiting assembly is arranged on the lower surface of the second anti-shear plate, and the second limiting assembly is used to limit the corresponding jacking mechanism; A second supporting rib plate, wherein the second supporting rib plate is arranged on an upper surface of the second anti-shear plate and connected to the third balance beam.

10. The traveling mechanism of the trolley according to claim 9, characterized in that: The second limiting assembly includes two second stoppers, which are symmetrically arranged on the lower surface of the second anti-shear plate, and a limiting interval is formed between the two second stoppers.

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