Low-resistance walking structure of excavation trolley

Abstract

The invention belongs to the technical field of trolleys, and particularly relates to a low-resistance walking structure of an excavation trolley, which comprises a walking structure mounted at the bottom of a frame, the walking structure comprises steel wheels and rubber wheels which are coaxially fixed, and a flexible steel rail for the steel wheels to walk, and the flexible steel rail is positioned in an accommodating space of a bearing shell; the space between the bottom of the flexible steel rail and the containing space of the bearing shell is filled with a cushion layer, and the space between the cushion layer and the containing space of the bearing shell is filled with a covering layer used for partially burying the flexible steel rail. The diameter of the rubber wheel is larger than that of the steel wheel, when the steel wheel is located on the flexible steel rail, the rubber wheel is suspended, a traditional crawler walking structure is changed into a track walking structure according to local materials used for a gravel pavement and a working environment, and walking resistance during walking can be greatly reduced through track walking; and the problem of frame distortion during walking can be avoided, and the walking stability and the walking speed are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of trolley technology, specifically relating to a low-resistance walking structure for an excavation trolley. Background Technology

[0002] During tunnel excavation, explosives are installed after drilling holes in the excavation face. The blasted debris is then cleared and removed from the tunnel by a combination of bulldozers and dump trucks. However, some debris remains on the ground, making it difficult for the bulldozers to clear. To improve work progress, the debris on the ground is left unremoved initially. Even after clearing the debris, the ground after blasting remains uneven, making it easier to pave the road with the debris. Furthermore, during blasting, the excavation trolley needs to move back and forth 80 meters away from the blasting area. After clearing the blasted debris, it needs to be moved to a new excavation face. However, the gravel ground is not conducive to the movement of the excavation trolley. Therefore, a tracked walking mechanism is generally used to cope with the complex ground environment. However, the tracked walking mechanism has a slow walking speed and a large amount of swaying during movement, causing the trolley frame to deform due to the swaying and twisting. In addition, due to the high resistance of the trolley's movement, the required hydraulic pressure is also greater, which often leads to the problem of hydraulic pipe rupture due to high hydraulic pressure. Summary of the Invention

[0003] To address the problems mentioned in the background section, this invention provides a low-resistance walking structure for an excavation trolley. It replaces the traditional tracked walking structure with a rail-based walking structure. Rail-based walking significantly reduces resistance during movement and avoids frame twisting, resulting in a substantial improvement in both stability and speed.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a low-resistance walking structure for an excavation trolley, comprising a walking structure installed at the bottom of the frame, the walking structure comprising a steel wheel and a rubber wheel fixed coaxially, and a flexible steel rail for the steel wheel to travel, the flexible steel rail being located in the accommodating space of the bearing shell, and a padding layer being filled between the bottom of the flexible steel rail and the accommodating space of the bearing shell, and a covering layer for partially burying the flexible steel rail being filled between the padding layer and the accommodating space of the bearing shell;

[0005] When the diameter of the rubber wheel is larger than that of the steel wheel, and the steel wheel is located on the flexible steel rail, the rubber wheel is suspended in the air.

[0006] As a preferred low-resistance walking structure of the excavation trolley of the present invention, the bearing shell is connected by a multi-segment splicing method. A connecting sleeve is fixedly connected at the splicing position of two adjacent bearing shells. An L-shaped rod is inserted into each of the two corresponding connecting sleeves on the two adjacent bearing shells. The two corresponding L-shaped rods are threadedly connected to a threaded sleeve. The threaded sleeve is used to control the synchronous approach or departure of the two L-shaped rods.

[0007] As a preferred low-resistance walking structure of the excavation trolley of the present invention, the flexible steel rail is connected by multiple splicing. Both ends of the flexible steel rail are provided with through holes. The clamping plate is attached to the joint of the two flexible steel rails and is fixed relative to the flexible steel rail by bolts and nuts.

[0008] As a preferred low-resistance traveling structure of the excavation trolley of the present invention, the bottom of the frame located directly above the flexible steel rail is fixedly connected with a number of hanging rails for the suspension and sliding of the flexible steel rail. The hanging rails include a hanger and a towing wheel, and the hanger is rotatably connected to the towing wheel through a connecting plate.

[0009] As a preferred low-resistance traveling structure of the excavation trolley of the present invention, the hoisting line formed by several rails has a straight track in the middle section and an arc track at both ends, and the curvature of the arc track is not greater than the bending curvature of the flexible steel rail under gravity.

[0010] As a preferred low-resistance walking structure of the excavation trolley of the present invention, an electric slide rail is fixedly connected to the bottom of the frame located between the two hangers.

[0011] As a preferred low-resistance walking structure of the excavation trolley of the present invention, a trolley is slidably connected to the bearing shell.

[0012] As a preferred low-resistance traveling structure of the excavation trolley of the present invention, a three-pronged frame is fixedly connected to the forward end of the frame located directly above the flexible steel rail. A main rod is rotatably connected to the middle fork of the three-pronged frame via a ball joint. Two short rods A are symmetrically fixedly connected to one end of the main rod. The ends of the short rods A and the two side forks of the three-pronged frame are rotatably connected to hydraulic rods A via ball joints. A wheel frame is fixedly connected to the bottom end of the main rod. A clamping wheel is symmetrically rotatably connected to the end of the wheel frame.

[0013] As a preferred low-resistance walking structure of the excavation trolley of the present invention, a load-bearing bracket is rotatably connected to the outer side of the common axle of the steel wheel and the rubber wheel, and a turntable is fixedly connected to the top of the load-bearing bracket. The top of the outer shell of the turntable, which rotates relative to the load-bearing bracket, is fixedly connected to the bottom of the frame.

[0014] As a preferred low-resistance walking structure of the excavation trolley of the present invention, two short rods B, which are staggered in position, are fixedly connected to the outer shell surface of the turntable that rotates relative to the load-bearing support and the surface of the load-bearing support. The ends of the two short rods B are rotatably connected to a hydraulic rod B through ball joints.

[0015] Compared with existing technologies, the beneficial effects of this invention are as follows: Based on the availability of local materials for the gravel road surface and working environment, the traditional tracked walking structure is replaced with a rail-walking structure. Rail-walking significantly reduces resistance during movement and avoids frame twisting issues, resulting in significantly improved stability and speed. To address the problem of laying flexible rails in complex environments, reducing the difficulty and speed of flexible rail laying, this is achieved through the combination of flexible rails and a supporting shell. First, the supporting shell is placed at the target location. Then, locally sourced gravel is loaded into the inner side of the supporting shell to form a cushion layer. The structural shape of the supporting shell reduces the amount of gravel used for the cushion layer, decreasing workload. Furthermore, laying the cushion layer within the smaller supporting shell makes it easier to smooth its flatness (due to its smaller size compared to traditional railway construction where gravel occupies less space). With a smaller footprint, the surface leveling is easier to adjust. If the size of the crushed stone is uneven, it can be crushed using a crusher, resulting in better flatness when laying flexible rails. This solves the problem of laying flexible rails more easily on uneven or non-level road surfaces. To improve efficiency and further enhance the stability of the flexible rails during laying, crushed stone or a mixture of crushed stone and yellow sand is laid on the bearing shell's pad layer to form a covering layer, which is used to bury part of the flexible rails, further improving its stability. To further improve the adaptability of the trolley to different road surfaces and increase its travel efficiency on different surfaces, rubber wheels coaxial with the steel wheels are installed. The rubber wheels are used to travel on already leveled paved roads, eliminating the need to lay flexible rails and improving efficiency. At the same time, they also provide further protection for the steel wheels traveling on the flexible rails, ensuring that even if a derailment accident occurs, there will be no safety incident. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the overall structure of the walking structure in this invention;

[0019] Figure 3 In this invention Figure 2 An enlarged structural diagram at point A;

[0020] Figure 4 In this invention Figure 2 A magnified structural diagram at point B;

[0021] Figure 5 This is a schematic diagram of the connection structure of the hydraulic motor in this invention;

[0022] Figure 6 This is a schematic diagram comparing the diameters of the steel wheel and the rubber wheel in this invention;

[0023] Figure 7 This is a schematic diagram of the connection structure of the load-bearing support in this invention;

[0024] Figure 8 This is a schematic diagram of the connection structure of the coupling sleeve in this invention;

[0025] Figure 9 This is a schematic diagram of the laying of the underlayment and cover layer in this invention;

[0026] Figure 10 This is an exploded view of the connection structure of the clamping plate in this invention;

[0027] Figure 11 This is a schematic diagram of the three-section structure of the hanging rail in this invention;

[0028] Figure 12 This is a schematic diagram of the mating structure between the scooter and the supporting shell in this invention;

[0029] In the picture:

[0030] 1. Frame; 21. Steel wheels; 22. Rubber wheels; 23. Flexible steel rails; 24. Load-bearing shell; 25. Pad layer; 26. Covering layer; 6. Ball joint;

[0031] 231. Through hole; 232. Clamping plate;

[0032] 241. Connecting sleeve; 242. L-shaped rod; 243. Threaded sleeve;

[0033] 31. Hanging bracket; 32. Traction wheel; 33. Electric slide rail; 34. Scooter;

[0034] 41. Trident; 42. Main rod; 43. Short rod A; 44. Hydraulic rod A; 45. Wheel frame; 46. Clamping wheel;

[0035] 51. Load-bearing bracket; 52. Turntable; 53. Short rod B; 54. Hydraulic rod B; 55. Hydraulic motor; 56. Chain; 57. Large sprocket. Detailed Implementation

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] like Figures 1-12 As shown:

[0038] A low-resistance walking structure for an excavation trolley includes a walking structure installed at the bottom of a frame 1. The walking structure includes a steel wheel 21 and a rubber wheel 22 fixed coaxially, and a flexible steel rail 23 for the steel wheel 21 to travel. The flexible steel rail 23 is located in the receiving space of the bearing housing 24, and a pad 25 is filled between the bottom of the flexible steel rail 23 and the receiving space of the bearing housing 24. A covering layer 26 for partially burying the flexible steel rail 23 is filled between the pad 25 and the receiving space of the bearing housing 24.

[0039] The diameter of the rubber wheel 22 is larger than that of the steel wheel 21, and the rubber wheel 22 is suspended when the steel wheel 21 is located on the flexible steel rail 23.

[0040] During tunnel excavation, explosives are installed after drilling holes in the excavation face. The blasted debris is then cleared and removed from the tunnel by a combination of bulldozers and dump trucks. However, some debris remains on the ground, making it difficult for the bulldozers to clear. To improve the work progress, the debris on the ground is left unremoved. Even after clearing the debris, the ground after blasting is still uneven, making it easier to pave the road with the debris. Furthermore, during blasting, the excavation trolley needs to move back and forth 80 meters away from the blasting area. After clearing the blasted debris, it needs to be moved to a new excavation face. However, the gravel ground is not conducive to the movement of the excavation trolley. Therefore, a tracked walking mechanism is generally used to deal with the complex ground environment. However, the tracked walking mechanism has a slow walking speed and a large amount of shaking during movement, which causes the trolley frame 1 to deform due to the shaking and twisting during movement. In addition, due to the high resistance of the trolley's movement, the required hydraulic pressure is also greater, which often leads to the problem of hydraulic pipe rupture due to high hydraulic pressure.

[0041] Based on the availability of local materials for the gravel road surface and working environment, the traditional tracked walking structure was changed to a rail-based walking structure. Rail-based walking significantly reduces resistance during movement and avoids frame torsion issues, resulting in significantly improved stability and speed. To address the challenges of laying flexible steel rails 23 in complex environments, reducing laying difficulty and increasing laying speed, this is achieved by combining the flexible steel rails 23 with a supporting shell 24. First, the supporting shell 24 is placed at the target location. Then, locally sourced gravel is loaded into the inner side of the supporting shell 24 to form a cushion layer 25. The structural shape of the supporting shell 24 reduces the amount of gravel cushion layer 25 used, decreasing workload. Furthermore, laying the cushion layer 25 within the smaller supporting shell 24 makes it easier to smooth its flatness (due to its smaller size compared to traditional railway construction, the gravel occupies less volume, thus improving flatness). The repair is easier. If the size of the crushed stone is uneven, it can be crushed by a crusher. This makes it easier to lay the flexible steel rail 23 when the road surface is uneven or not level. In order to improve efficiency and further enhance the stability of the flexible steel rail 23 during laying, crushed stone or a mixture of crushed stone and yellow sand is laid on the pad 25 of the bearing shell 24 to form a covering layer 26, which is used to fill part of the flexible steel rail 23 and further improve its stability. In order to further improve the adaptability of the trolley to different road surfaces and improve the walking efficiency on different road surfaces, a rubber wheel 22 coaxial with the steel wheel 21 is set. The rubber wheel 22 is used to walk on the already repaired and leveled paved road surface, eliminating the need to lay the flexible steel rail 23 and improving efficiency. At the same time, it is also a further guarantee for the steel wheel 21 to walk on the flexible steel rail 23. Even if a derailment accident occurs, there will be no safety accident.

[0042] In an optional embodiment, the bearing housing 24 is connected by a multi-segment splicing method. At the splicing position of two adjacent bearing housings 24, a connecting sleeve 241 is fixedly connected. An L-shaped rod 242 is inserted into each of the two corresponding connecting sleeves 241 on the two adjacent bearing housings 24. The two corresponding L-shaped rods 242 are threadedly connected to a threaded sleeve 243. The threaded sleeve 243 is used to control the synchronous approach or distance of the two L-shaped rods 242.

[0043] In this embodiment, during blasting operations, the excavation trolley needs to move back and forth more than 80 meters away from the blasting area. This means the trolley needs to travel over a distance of more than 80 meters. To reduce the effort required to lay the bearing shell 24, it is designed as a multi-segment splicing structure, reducing transportation difficulty. Since the bearing shell 24 mainly functions as a bearing pad 25 and a covering layer 26, even a small misalignment between two bearing shells 24 does not affect the laying of the flexible rail 23. When the flexible rail 23 needs to be curved, adjacent bearing shells 24 can have a certain angle of inclination to accommodate the curved flexible rail 23. Therefore, when the bearing shell 24 accommodates the flexible rail 23, the accommodating width of the bearing shell 24 must be greater than the cross-sectional width of the flexible rail 23. Since the bending radius of the tunnel is over 700 meters, and the length of the trolley is generally 10-16 meters, the length of a single bearing shell 24 can be controlled between 2.8-4.2 meters. That is to say, taking the minimum radius of the tunnel of 700 meters and the length of a single bearing shell 24 of 4.2 meters as an example, the relative tilt angle between two adjacent bearing shells 24 is only 0.34°, which is not obvious and is close to a straight line. When the bearing shells 24 are connected to each other, L-shaped rods 242 can be inserted into the connecting sleeve 241, and the distance between the two L-shaped rods 242 can be adjusted by the threaded sleeve 243. When the threaded sleeve 243 is rotated, the two L-shaped rods 242 can be controlled to move closer or further apart. If it is necessary to place two adjacent bearing shells 24 at a relative tilt, it is only necessary to adjust the distance between the two L-shaped rods 242 on one side.

[0044] In an optional embodiment, the flexible steel rail 23 is connected by splicing multiple segments. Both ends of the flexible steel rail 23 are provided with through holes 231. The clamping plate 232 is attached to the joint of the two flexible steel rails 23 and is fixed relative to the flexible steel rail 23 by bolts and nuts.

[0045] In this embodiment, to reduce the transportation difficulties of the flexible steel rail 23, the flexible steel rail 23 is connected by splicing multiple sections, such as... Figure 10 As shown, two clamping plates 232 are respectively attached to both sides of the joint of the flexible steel rail 23, and the holes on the clamping plates 232 are aligned with the through holes 231 on the flexible steel rail 23. They are then locked with bolts and nuts to achieve the joint fixation of the flexible steel rail 23. The length of a single flexible steel rail 23 can be less than the length of the trolley, which makes it easier to transport the flexible steel rail 23.

[0046] In an optional embodiment, a plurality of suspension rails for suspending and sliding the flexible steel rail 23 are fixedly connected to the bottom of the frame 1 located directly above the flexible steel rail 23. The suspension rails include a hanger 31 and a tow wheel 32. The hanger 31 is rotatably connected to the tow wheel 32 through a connecting plate.

[0047] In this embodiment, it is assumed that the total length of the flexible steel rail 23 to be laid is 120 meters. The excavation trolley moves back and forth on the 120-meter-long flexible steel rail 23. As the tunnel continues to be excavated, the last section of flexible steel rail 23 needs to be unloaded and laid at the front. In order to reduce the cumbersomeness of transporting the flexible steel rail 23, the flexible steel rail 23 can be suspended by several hanging rails through the trolley transportation. The flexible steel rail 23 can slide on the hanging rails, realizing the flexible steel rail 23 is carried by the hanging rails in a suspended manner. At the same time, the movement of the flexible steel rail 23 relative to the hanging rails can transfer the flexible steel rail 23 from the rear to the front of the trolley.

[0048] In one optional embodiment, the hoisting line formed by several rails has a straight track in the middle and arc tracks at both ends, and the curvature of the arc tracks is not greater than the bending curvature of the flexible steel rail 23 under gravity.

[0049] In this embodiment, when the flexible steel rail 23 is suspended at one end, it will bend due to gravity. If all the hanging rails are arranged in a straight line, the outermost hanging rail will bear a large weight when the flexible steel rail 23 slides off the hanging rail. Therefore, by making the hoisting line formed by several hanging rails a straight track in the middle and an arc track at both ends, and the curvature of the arc track is not greater than the bending curvature of the flexible steel rail 23 under gravity, the weight borne by the outermost hanging rail can be reduced and distributed to other adjacent hanging rails. At the same time, when the flexible steel rail 23 is taken out from the bearing housing 24 and hung on the hanging rail, the position of the hanging rail at the end is relatively lower and it is easier to suspend it.

[0050] In an optional embodiment, an electric slide rail 33 is fixedly connected to the bottom of the frame 1 located between the two hangers 31.

[0051] In this embodiment, the electric slide rail 33 can push the flexible steel rail 23 suspended on the hanging rail to move, saving manpower. When it is necessary to remove the flexible steel rail 23 from the bearing housing 24 (moving the last flexible steel rail 23 to the front), the excess covering layer 26 in the bearing housing 24 is removed, exposing the through hole 231 on the flexible steel rail 23. Then, a hand chain hoist is hung on the slide head of the electric slide rail 33. The chain rope in the hand chain hoist is fixed to the through hole 231 through the hook. Pulling the hand chain hoist lifts one end of the flexible steel rail 23, so that the flexible steel rail... The end of 23 is higher than the towing wheel 32. Then the electric slide rail 33 is started. The slider in the electric slide rail 33 will drive the flexible steel rail 23 to move and pull the flexible steel rail 23 onto the hanging rail. Since the load support 51 is installed on the frame 1, it is not possible to install an electric slide rail 33 with the same length as the trolley. Therefore, the electric slide rail 33 is divided into three sections. When two sections of the electric slide rail 33 hook the flexible steel rail 23, the slider in the next section of the electric slide rail 33 needs to connect with the flexible steel rail 23. Then the connection between the previous electric slide rail 33 and the flexible steel rail 23 is released.

[0052] In an alternative embodiment, a scooter 34 is slidably connected to the support housing 24.

[0053] In this embodiment, when it is necessary to continue laying the flexible steel rail 23 forward, the flexible steel rail 23 located on the hanging rail is pushed into the bearing housing 24 in front. Since the bearing housing 24 laid in advance has a leveled pad 25 installed inside, if the flexible steel rail 23 directly contacts the pad 25, it will not only damage the pad 25, but also prevent the flexible steel rail 23 from moving due to excessive resistance. Therefore, a trolley 34 that can slide on the bearing housing 24 is set on it. The front end of the flexible steel rail 23 is placed on the trolley 34, and the trolley 34 can drive the flexible steel rail 23 to move, so that the flexible steel rail 23 is completely separated from the hanging rail. Then, the rear end of the flexible steel rail 23 is lowered using a hand chain hoist. During the process of lowering the flexible steel rail 23, the position of the flexible steel rail 23 needs to be continuously adjusted so that the flexible steel rail 23 can be easily connected with the laid flexible steel rail 23. After the rear end of the flexible steel rail 23 is lowered, the front end of the flexible steel rail 23 is unloaded from the trolley 34, completing the transfer of the flexible steel rail 23.

[0054] In an optional embodiment, a fork 41 is fixedly connected to the forward end of the frame 1 located directly above the flexible steel rail 23. A main rod 42 is rotatably connected to the middle fork of the fork 41 via a ball joint 6. Two short rods A43 are symmetrically fixedly connected to one end of the main rod 42. Hydraulic rods A44 are rotatably connected to the ends of the short rods A43 and the two side forks of the fork 41 via ball joints 6. A wheel frame 45 is fixedly connected to the bottom end of the main rod 42. A clamping wheel 46 is symmetrically rotatably connected to the end of the wheel frame 45.

[0055] In this embodiment, since the tunnel has curved sections, the flexible steel rail 23 also needs to bend along with the tunnel. The main rod 42 can be rotated relative to the tripod 41 by two hydraulic rods A44. That is, the main rod 42 rotates at multiple angles around the end of the middle fork of the tripod 41 through the ball head 6, so that the end of the main rod 42 can move up, down, left and right. The end of the main rod 42 drives the clamping wheel 46 to move through the wheel frame 45. The clamping wheel 46 can drive the flexible steel rail 23 to move, so that the flexible steel rail 23 bends. As the trolley moves, the flexible steel rail 23 can eventually form the target curved shape under the push of the clamping wheel 46.

[0056] In an optional embodiment, a load-bearing bracket 51 is rotatably connected to the outside of the common axle of the steel wheel 21 and the rubber wheel 22. A turntable 52 is fixedly connected to the top of the load-bearing bracket 51. The top of the outer shell of the turntable 52, which rotates relative to the load-bearing bracket 51, is fixedly connected to the bottom of the frame 1. The load-bearing bracket 51 is rotatably connected to the common axle of the steel wheel 21 and the rubber wheel 22.

[0057] In an optional embodiment, two short rods B53, which are staggered in position, are fixedly connected to the outer surface of the turntable 52 relative to the load-bearing bracket 51 and the surface of the load-bearing bracket 51. The ends of the two short rods B53 are rotatably connected to a hydraulic rod B54 through a ball head 6.

[0058] In this embodiment: the distance between the two short rods B53 can be controlled by extending or shortening the hydraulic rod B54. Since one of the short rods B53 is fixed to the outer surface of the turntable 52 relative to the trolley, the short rod B53 fixed on the load support 51 will be forced to move, realizing the rotation of the load support 51. The load support 51 can drive the steel wheel 21 and the rubber wheel 22 to rotate, which is the traditional steering method. This steering method is used when the trolley is off the track, that is, when the excavation trolley travels on the paved road surface via the rubber wheel 22. This allows the trolley to travel on the paved road surface and also to turn. The hydraulic motor 55 is fixed on the load support 51. The hydraulic motor 55 drives the chain 56 through the sprocket. The chain 56 drives the large sprocket 57 to rotate, thereby causing the large sprocket 57 to drive the steel wheel 21 and the rubber wheel 22 to rotate.

[0059] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-resistance traveling structure for an excavation trolley, characterized in that: The vehicle includes a running structure installed at the bottom of the frame (1), the running structure includes a steel wheel (21) and a rubber wheel (22) fixed on the same axis, and a flexible steel rail (23) for the steel wheel (21) to run. The flexible steel rail (23) is located in the receiving space of the bearing shell (24), and a pad (25) is filled between the bottom of the flexible steel rail (23) and the receiving space of the bearing shell (24). A covering layer (26) for partially burying the flexible steel rail (23) is filled between the pad (25) and the receiving space of the bearing shell (24). The diameter of the rubber wheel (22) is larger than that of the steel wheel (21), and the rubber wheel (22) is suspended when the steel wheel (21) is located on the flexible steel rail (23).

2. The low-resistance traveling structure of the excavation trolley according to claim 1, characterized in that: The bearing housing (24) is connected by a multi-segment splicing method. At the splicing position of two adjacent bearing housings (24), a connecting sleeve (241) is fixedly connected. An L-shaped rod (242) is inserted into each of the two corresponding connecting sleeves (241) on the two adjacent bearing housings (24). The two corresponding L-shaped rods (242) are threadedly connected to a threaded sleeve (243). The threaded sleeve (243) is used to control the synchronous approach or distance of the two L-shaped rods (242).

3. The low-resistance traveling structure of the excavation trolley according to claim 1, characterized in that: The flexible steel rail (23) is connected by splicing multiple sections. Both ends of the flexible steel rail (23) are provided with through holes (231). The clamping plate (232) is attached to the joint of the two flexible steel rails (23). The clamping plate (232) is fixed relative to the flexible steel rail (23) by bolts and nuts.

4. The low-resistance traveling structure of the excavation trolley according to claim 1, characterized in that: The bottom of the frame (1) located directly above the flexible steel rail (23) is fixedly connected to several suspension rails for the suspension and sliding of the flexible steel rail (23). The suspension rails include a hanger (31) and a tow wheel (32). The hanger (31) is rotatably connected to the tow wheel (32) through a connecting plate.

5. The low-resistance traveling structure of the excavation trolley according to claim 4, characterized in that: The hoisting line formed by several rails has a straight track in the middle and an arc track at both ends, and the curvature of the arc track is not greater than the curvature of the flexible steel rail (23) under gravity.

6. The low-resistance traveling structure of the excavation trolley according to claim 4, characterized in that: An electric slide rail (33) is fixedly connected to the bottom of the frame (1) located between the two hangers (31).

7. The low-resistance traveling structure of the excavation trolley according to claim 4, characterized in that: A scooter (34) is slidably connected to the supporting shell (24).

8. The low-resistance traveling structure of the excavation trolley according to claim 1, characterized in that: A three-pronged fork (41) is fixedly connected to the forward end of the frame (1) located directly above the flexible steel rail (23). The middle fork of the three-pronged fork (41) is rotatably connected to the main rod (42) via a ball head (6). Two short rods A (43) are symmetrically fixedly connected to one end of the main rod (42). The ends of the short rods A (43) and the two sides of the fork of the three-pronged fork (41) are rotatably connected to hydraulic rods A (44) via ball heads (6). A wheel frame (45) is fixedly connected to the bottom end of the main rod (42). A clamping wheel (46) is symmetrically rotatably connected to the end of the wheel frame (45).

9. The low-resistance traveling structure of the excavation trolley according to claim 1, characterized in that: A load-bearing bracket (51) is rotatably connected to the outside of the common axle of the steel wheel (21) and the rubber wheel (22). A turntable (52) is fixedly connected to the top of the load-bearing bracket (51). The top of the outer shell of the turntable (52) that rotates relative to the load-bearing bracket (51) is fixedly connected to the bottom of the frame (1).

10. The low-resistance traveling structure of the excavation trolley according to claim 9, characterized in that: The outer shell surface of the turntable (52) rotating relative to the load support (51) and the surface of the load support (51) are both fixedly connected to two short rods B (53) that are staggered in position. The ends of the two short rods B (53) are rotatably connected to a hydraulic rod B (54) through a ball head (6).

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