Lifting device and truck

Abstract

The present invention discloses a lifting device and a truck, wherein the lifting device comprises a first driving assembly, wherein the first driving assembly comprises a first driving part and a first transmission part, wherein the first driving part is fixedly arranged on the upper surface of the part to be lifted, and the free end of the first transmission part can pass through the part to be lifted in a vertical direction under the driving of the first driving part, and extend and retract through the lower surface of the part to be lifted; a bearing structure, wherein the bearing structure is used to support the part to be lifted; when the lifting device is in an initial state, the first transmission part is spaced apart from the bearing structure; when the lifting device is in a lifting state, the free end of the first transmission part extends from the lower surface of the part to be lifted, and is supported on the bearing structure, so as to drive the part to be lifted to move upward relative to the bearing structure.

Description

Technical Field

[0001] The present invention relates to the technical field of railway transportation, and in particular to a lifting device and a freight car. Background Art

[0002] In order to facilitate the loading and unloading of goods, railway long and large freight cars use a lifting device to lift and lower the goods through the operation of the hydraulic system.

[0003] See also Figure 1 The lifting device used in the existing long and large cargo vehicle includes a hydraulic cylinder 90, which drives the vehicle body structure 100 to rise and fall by extending and contracting the hydraulic cylinder. The hydraulic cylinder is integrated with the steel structure, and the vertical force and longitudinal force caused during the use of the vehicle are transmitted through the hydraulic cylinder 90. After the hydraulic cylinder 90 lifts the vehicle body structure 100 to a set position, it is locked by a locking nut.

[0004] The hydraulic cylinder 90 is directly connected to the vehicle body structure 100 and plays a role in supporting the vehicle body structure 100. The hydraulic cylinder 90 is subjected to radial loads, which may easily lead to leakage of the hydraulic cylinder 90 and affect driving safety. Summary of the invention

[0005] An object of the present invention is to provide a new technical solution for a lifting device and a truck.

[0006] In one aspect of the present invention, a lifting device is provided, the lifting device comprising a first driving assembly, the first driving assembly comprising a first driving part and a first transmission part, the first driving part being fixedly arranged on the upper surface of the part to be lifted, the free end of the first transmission part being driven by the first driving part to pass through the part to be lifted in a vertical direction, and extending and retracting through the lower surface of the part to be lifted;

[0007] A bearing structure, the bearing structure is used to support the part to be lifted;

[0008] When the lifting device is in an initial state, the first transmission part is spaced apart from the bearing structure;

[0009] When the lifting device is in a lifting state, the free end of the first transmission part extends out from the lower surface of the part to be lifted and is supported on the bearing structure to drive the part to be lifted to move upward relative to the bearing structure.

[0010] Optionally, the part to be lifted is provided with a receiving groove, and when the lifting device is in an initial state, a part of the bearing structure is located in the receiving groove and supports the part to be lifted.

[0011] Optionally, when the lifting device is in a lifting state, part of the stop portion extends into the bearing structure, the free end of the first transmission portion is separated from the bearing structure, at least part of the upper end surface of the stop portion abuts against the lower surface of the part to be lifted, and the lower end surface of the stop portion is supported on the bearing structure.

[0012] Optionally, the lifting device further includes: a second driving assembly, wherein the second driving assembly is connected to the stopper to drive the stopper to move.

[0013] Optionally, the stopper includes a cover plate, a bottom plate, and a vertical plate, and the vertical plate is fixedly connected between the cover plate and the bottom plate.

[0014] Optionally, the stopper comprises an extension portion, and the extension portion is formed by extending the bottom plate or the cover plate toward the second driving assembly;

[0015] The second driving assembly includes a second driving portion and a second transmission portion, and the stop portion is fixedly connected to the free end of the second transmission portion through the extension portion.

[0016] Optionally, a concave cavity is provided at the free end of the second transmission part, and the extension part is embedded in the concave cavity and fixedly connected to the concave cavity; or,

[0017] The stopper portion comprises a connecting plate, the connecting plate and the extending portion enclose a gap, the free end of the second transmission portion is embedded in the gap, and is fixedly connected to the connecting plate and the extending portion.

[0018] According to another aspect of the present invention, there is provided a truck, the truck comprising a part to be lifted, a running part and the lifting device described above, the part to be lifted is provided with a receiving groove, the notch of the receiving groove is located on the lower surface of the part to be lifted;

[0019] The bearing structure includes a core plate beam and a core plate, the core plate beam includes an upper end surface and a lower end surface opposite to each other, the core plate is fixed to the lower end surface and pressed on the running part;

[0020] When the lifting device is in an initial state, the upper end surface of the core beam is located in the receiving groove, and the part to be lifted is supported by the receiving groove.

[0021] Optionally, an annular protrusion is formed around the inner wall of the accommodating groove, and the annular protrusion and the groove bottom form a receiving cavity, and the free end of the first transmission part can be received in the receiving cavity to be spaced from the core plate beam.

[0022] Optionally, the lifting device further includes a stop portion, and the core beam is provided with a socket adapted to the stop portion, and the number of the socket matches that of the stop portion.

[0023] Optionally, at a position where the core beam contacts the receiving groove; and / or,

[0024] A wear plate is provided at a position where the core beam contacts the stopper.

[0025] In this way, it is avoided that the transmission components and the driving components are damaged due to the reaction force from the bearing structure 11 during the driving of the vehicle.

[0026] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0028] Figure 1 It is a structural schematic diagram of a lifting device;

[0029] Figure 2 is a structural schematic diagram of a lifting device in an initial state according to an embodiment of the present invention;

[0030] Figure 3 is a structural schematic diagram of a lifting device in a lifting state according to an embodiment of the present invention;

[0031] Figure 4 is a side view of the core beam of the lifting device in the embodiment of the present invention along the long side direction;

[0032] Figure 5 is a side view of the central plate beam of the lifting device in the embodiment of the present invention along the wide side direction;

[0033] Figure 6 It is one of the structural schematic diagrams of the stopper portion of the lifting device in an embodiment of the present invention;

[0034] Figure 7 This is the second structural schematic diagram of the stopper portion of the lifting device in the embodiment of the present invention.

[0035] Description of reference numerals:

[0036] 1. First hydraulic cylinder; 2. Part to be lifted; 21. Upper surface; 22. Lower surface; 3. First piston rod; 4. Wear plate; 5. Center plate beam; 51. First upper cover plate; 52. First lower cover plate; 53. Side plate; 6. Center plate; 7. Stopper; 71. Cover plate; 72. Bottom plate; 73. Vertical plate; 74. Rib plate; 72-a. Extension part; 8. Connecting pin; 81. Connecting plate; 9. Second hydraulic cylinder; 91. Concave cavity; 92. Second piston rod; 11. Bearing structure; 55. Socket; 12. Accommodating groove; 12-a. Storage cavity. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0038] The horizontal direction generally refers to the direction parallel to the horizon, and the vertical direction refers to the direction perpendicular to the horizontal direction, that is, the height direction of the lifting device.

[0039] According to one embodiment of the present application, a lifting device is provided. Figure 2 and Figure 3 , the lifting device includes a first driving assembly, and the first driving assembly includes a first driving part and a first transmission part. The first driving part can be a hydraulic cylinder or a gas cylinder, etc., and the first transmission part is, for example, a piston rod of a hydraulic cylinder or other pipes connected to the piston rod. The first driving part is fixed on the upper surface 21 of the part to be lifted 2, and the free end of the first transmission part can pass through the part to be lifted 2 in the vertical direction under the drive of the first driving part, and extend and retract through the lower surface 22 of the part to be lifted 2. The bearing structure 11, the bearing structure 11 is used to support the part to be lifted 2. When the lifting device is in the initial state, the first transmission part is spaced apart from the bearing structure 11, and the bearing structure 11 supports the device to be lifted. When the lifting device is in the lifting state, the free end of the first transmission part extends from the lower surface 22 of the part to be lifted 2 and is supported on the bearing structure 11 to drive the part to be lifted 2 to move upward relative to the bearing structure 11.

[0040] In this way, the prior art avoids the situation that when the lifting device is in the initial state, the transmission component is still connected to the bearing structure 11. It also avoids the transmission component and the drive component being damaged by the reaction force from the bearing structure 11 during the driving of the vehicle.

[0041] For example, Figure 2 and Figure 3 As shown, the part to be lifted 2 is provided with a receiving groove 12 . When the lifting device is in an initial state, a part of the bearing structure 11 is located in the receiving groove 12 and supports the part to be lifted 2 .

[0042] By opening a receiving groove 12 in the part to be lifted 2 and allowing a portion of the bearing structure 11 to extend into the receiving groove 12 and form a limiting fit with the receiving groove 12, the space occupied by the lifting device is effectively reduced and the height of the vehicle with the lifting device itself is reduced.

[0043] In one example, see Figure 2 and Figure 3 The lifting device also includes a stop portion 7. When the lifting device is in a lifting state, a portion of the stop portion 7 extends into the bearing structure 11, the free end of the first transmission part is separated from the bearing structure 11, at least a portion of the upper end surface of the stop portion 7 is in contact with the lower surface 22 of the part to be lifted 2, and the lower end surface of the stop portion 7 is supported on the bearing structure 11.

[0044] In this way, the part to be lifted 2 is pressed against the bearing structure 11 by the stopper 7. In the lifted state, the first transmission part is prevented from being in contact with the bearing structure 11 and subjected to force, thereby further preventing the first drive assembly from being damaged.

[0045] Furthermore, the lifting device also includes a second driving assembly, and the second driving assembly is connected to the stopper 7 to drive the stopper 7 to move.

[0046] The stopper 7 is driven to move by the second driving assembly, thereby avoiding manual operation of the stopper 7 and improving the automation and intelligence of the lifting device.

[0047] According to some embodiments of the present invention, there is provided a freight car, wherein the railway freight car comprises the above-mentioned lifting device. The freight car can be a railway freight car or a common freight car.

[0048] The vehicle comprises a part to be lifted 22, a running part and a bearing structure 11 located between the part to be lifted 22 and the running part. The running part is used to provide support for the bearing structure 11 and the part to be lifted 22.

[0049] The part to be lifted 22 is, for example, an underframe of a railway vehicle. The first driving assembly is, for example, a first hydraulic cylinder, and the first transmission assembly is, for example, a first piston rod of the first hydraulic cylinder. The part to be lifted 22 has an upper surface 21 and a lower surface 22 opposite to each other, and a cylinder body of the first hydraulic cylinder is fixed on the upper surface 21. The surface of the part to be lifted 22 opposite to the running part is the lower surface 22, and the upper surface 21 is located above the lower surface 22.

[0050] The bearing structure 11 includes a core plate beam 5 and a core plate 6. The core plate beam 5 is used to support the core plate 6. The surface of the core plate beam 5 away from the side of the to-be-lifted part 2 is the lower end surface, and the core plate 6 is fixed to the lower end surface of the core plate beam 5.

[0051] An accommodating groove 12 is provided on the lower surface 22 of the part to be lifted 2. The accommodating groove 12 is recessed from the lower surface 22 toward the direction close to the upper surface 21. The core plate beam 5 can be received in the accommodating groove 12. The core plate 6 is located outside the part to be lifted 2. The upper end surface of the core plate beam 5 is a surface close to one end of the part to be lifted 2, and the lower end surface is a surface connected to the core plate 6. The free end of the first piston rod 3 can pass through the part to be lifted 2 and extend from the notch of the accommodating groove 12, and cooperate with the upper end surface of the core plate beam 5 to drive the part to be lifted 2 to move in the vertical direction relative to the core plate beam 5.

[0052] like Figure 2 As shown, when the part to be lifted 2 is in the initial state, the free end of the first piston rod 3 is spaced apart from the upper end surface of the core beam 5 . Figure 2 The center plate 6 is accommodated in the accommodating groove 12 and cooperates with the accommodating groove 12 to support the part 2 to be lifted.

[0053] The initial state is a state where the part to be lifted 2 is not lifted and is in the initial position. When the part to be lifted 2 is in the initial position, the part to be lifted 2 is pressed on the running part as a whole and falls on the ground. The core plate beam 5 extends into the receiving groove 12. The receiving groove 12 forms a limit fit for the core plate beam 5 so that the upper end surface of the core plate beam 5 bears the load of the part to be lifted 2. The free end of the first piston rod 3 does not contact the core plate beam 5.

[0054] In this way, in the initial state, the free end of the first piston rod 3 is spaced apart from the center plate beam 5, thereby preventing the first hydraulic cylinder 1 from being affected by the vertical load and longitudinal load transmitted by the lifting part 2 and the running part, thereby preventing the first hydraulic cylinder 1 from being damaged.

[0055] In one embodiment of the present invention, when the portion to be lifted 2 is in the initial state, the bottom of the accommodating groove 12 is pressed against the upper end surface of the core beam 5 .

[0056] See also Figure 2 and Figure 3 , Figure 2 It is a structural schematic diagram of the lifting device of the present invention when the part to be lifted 2 is in an initial state; Figure 3 It is a structural schematic diagram of the lifting device when the part to be lifted 2 in the present invention is in a lifted state.

[0057] A through hole is provided at the bottom of the receiving groove 12 , and the first piston rod 3 can move in the through hole. The free end of the first piston rod 3 can extend into the receiving groove 12 and can move relative to the upper end surface of the core plate beam 5 .

[0058] Specifically, see Figure 2 and Figure 3An annular protrusion is formed around the inner wall of the receiving groove 12, and the annular protrusion and the groove bottom form a receiving cavity 12-a. When the lifting part 2 is in the initial state, the free end of the first piston rod 3 is located in the receiving cavity 12-a, and is spaced from the upper end surface of the core plate beam 5.

[0059] In this way, in the initial state, the upper end of the center plate beam 5 supports the part to be lifted 2. The free end of the first piston rod 3 is located in the storage cavity 12-a, avoiding contact with the center plate beam 5, and preventing the first hydraulic cylinder 1 from being affected by the vertical load and longitudinal load transmitted by the part to be lifted 2 and the running part.

[0060] In this embodiment, see Figure 2 and Figure 3 , the second driving component is, for example, a second hydraulic cylinder 9. The second hydraulic cylinder 9 is fixed on the lower surface 22 of the part 2 to be lifted. The second hydraulic cylinder 9 is located on the surface of the part 2 to be lifted away from the first hydraulic cylinder 1, and is located on the same side of the part 2 to be lifted as the bearing structure 11. The second hydraulic cylinder 9 includes a second piston rod 92, and a stopper 7 is fixed to the free end of the second piston rod 92. The second hydraulic cylinder 9 can drive the stopper 7 to move in the horizontal direction. The movement direction of the stopper 7 driven by the second hydraulic cylinder 9 is perpendicular to the movement direction of the part 2 to be lifted driven by the first hydraulic cylinder 1.

[0061] When the part to be lifted 2 is in the lifting state, the free end of the first piston rod 3 of the first hydraulic cylinder 1 is held on the upper end surface of the center plate beam 5 to drive the part to be lifted 2 to move in the direction away from the running part, that is, to move upward, and the second hydraulic cylinder 9 drives the stopper 7 to pass through the center plate beam 5 and be supported on the center plate beam 5, and the stopper 7 is opposite to the notch of the receiving groove 12 and forms a stopper match with the lower surface 22. The length of the stopper 7 is greater than the inner diameter of the notch of the receiving groove 12 to cover the notch radially and form abutment with the lower surface 22. Since the stopper 7 is carried on the center plate beam 5, the first piston rod 3 of the first hydraulic cylinder 3 can be retracted and does not bear the load of the part to be lifted 2.

[0062] Figure 3 In the lifting state, the part to be lifted 2 is lifted. In the lifting state, the height of the part to be lifted 2 from the ground is greater than the height of the part to be lifted 2 from the ground in the initial state.

[0063] In this way, the first hydraulic cylinder 1 drives the lifting part 2 to be lifted vertically, and after the lifting part 2 is lifted, the second hydraulic cylinder 9 drives the stopper 7 to cooperate with the lower surface 22 to fix the lifting part 2 at a set height, thereby significantly improving safety, being more convenient, and having high adaptability. The support locking after lifting is automatically realized.

[0064] In one embodiment of the present invention, when the stopper 7 forms a limited fit with the notch of the receiving groove 12, the free end of the first piston rod 3 is spaced from the upper end surface of the core plate beam 5. The spacing method has been described in the previous embodiment and will not be repeated here. In this way, in the lifting state, the first hydraulic cylinder 1 is prevented from being affected by the vertical load and the longitudinal load transmitted by the part to be lifted 2 and the running part, and further prevents the first hydraulic cylinder 1 from being damaged.

[0065] In one embodiment of the present invention, see Figure 4 and Figure 5 , Figure 4 It is a schematic diagram of the structure of the center plate beam 5 in the length direction. Figure 4 In order to clearly reflect the internal structure of the core beam 5, Figure 4 The right side of the center disk beam 5 is a cross-sectional view, that is, Figure 4 It is a half-section view. Figure 5 It is a schematic structural diagram of the core beam 5 in the width direction. Figure 5 The insertion hole 55 penetrates the core beam 5 along the width direction of the core beam 5.

[0066] At least one insertion hole 55 matching with the stopper 7 is arranged on the core beam 5, and the number of the insertion holes 55 matches the number of the stopper 7. When there are a plurality of insertion holes 55, the plurality of insertion holes 55 are arranged at intervals.

[0067] The socket 55 passes through the core plate beam 5 in the horizontal direction and is opposite to the stopper 7. In the lifting state, the stopper 7 passes through the core plate beam 5 through the socket 55 and covers the slot in the horizontal direction of the slot. The edge of the stopper 7 forms a support with the lower surface 22. The surface of the stopper 7 away from the part to be lifted 2 is pressed against the bottom wall of the socket 55. There can be multiple sockets 55 and there can also be multiple stoppers 7. Multiple stoppers 7 can be driven by one second hydraulic cylinder 9 or by multiple second hydraulic cylinders 9. Multiple sockets 55 are spaced apart along the length direction of the core plate beam 5 to provide further support for the part to be lifted 2.

[0068] In one example, the wear plate 4 is provided at a position where the outer surface of the core beam 5 contacts the inner surface of the receiving groove 12 ; and / or at a position where the lower end surface of the core beam 5 contacts the stopper 7 .

[0069] See also Figure 4 and Figure 5 The wear plates 4 are arranged at intervals on the upper end surface, the side surface and the lower end surface of the core plate beam 5. The wear plates 4 can be multiple groups, and the wear plates 4 are bolted to the core plate beam 5. In this way, the wear plates 4 can adjust the gap between the core plate beam 5 and the notch of the receiving groove 12. In addition, the wear between the lifting part 2 and the running part can be avoided, and the wear plates 4 can be replaced at any time when they are worn to a limit or damaged.

[0070] Alternatively, see Figure 4 and Figure 5 The core beam 5 includes a first upper cover plate 51, a first lower cover plate 52, and side plates 53 respectively connected to the first upper cover plate 51 and the first lower cover plate 52. The insertion hole 55 penetrates along the width direction of the core beam 5, and a reinforcing beam is provided between the bearing surface of the insertion hole 55 and the first lower cover plate 52. The reinforcing beam supports the insertion hole 55 in the vertical direction. In this way, the structural strength of the core beam 5 is enhanced, and the bearing performance of the core beam 5 on the lifting part 2 is improved.

[0071] In one embodiment of the present application, see Figure 6 , Figure 7 As shown in the figure, the stopper 7 includes a cover plate 71, a bottom plate 72 and a vertical plate 73 located between the cover plate 71 and the bottom plate 72. When the part 2 to be lifted is in a lifted state, the stopper 7 is used to bear the load of the part 2 to be lifted. The cover plate 71, the bottom plate 72 and the vertical plate 73 form a cavity, and a rib plate 74 is arranged in the cavity, and the rib plate 74 extends in the same direction as the vertical plate 73. A plurality of rib plates 74 are arranged in the cavity. The cover plate 71 and the bottom plate 72 are rectangular, and the vertical plate 73 can be arranged in two opposite long side directions of the cover plate 71 and the bottom plate 72, and can also be arranged in two opposite short side directions of the cover plate 71 and the bottom plate 72. Figure 6 The vertical plate 73 is arranged in the short side direction of the cover plate 71 and the bottom plate 72. Two rib plates 74 are respectively arranged on the inner wall of the vertical plate 73 to reinforce the support strength of the vertical plate 73. At least one rib plate 74 is arranged between the two rib plates 74 that are in contact with the inner wall of the vertical plate 73 to improve the structural strength of the stopper 7.

[0072] In one embodiment, in order to fix the stopper 7 on the second hydraulic cylinder 9, the bottom plate 72 has an extension portion 72-a. The extension portion 72-a is formed by the bottom plate 72 extending toward the direction close to the second hydraulic cylinder 9, and the cover plate 71 is staggered with the extension portion 72-a in the vertical direction. Figure 6 The position where the second piston rod 92 of the second hydraulic cylinder 9 is connected to the extension part 72-a has a concave cavity 91, and the extension part 72-a is embedded in the concave cavity 91 and fixedly connected to the concave cavity 91. The concave cavity 91 and the extension part 72-a are fixedly connected at the overlapping position by the connecting pin 8. It can be understood that other connection methods can also be used, as long as the stopper part 7 can be fixed on the second piston rod 92.

[0073] Alternatively, see Figure 7The lifting device is also provided with a connecting plate 81, which is fixed to the surface of the extension part 72-a opposite to the cover plate 71, and there is a gap between the connecting plate 81 and the extension part 72-a, and the second piston rod 92 is embedded between the connecting plate 81 and the extension part 72-a and fixedly connected. The connecting plate 81 is, for example, a bent structure, one end of the connecting plate 81 is welded to the extension part 72-a, and the other end of the connecting plate 81 forms a gap with the extension part 72-a to clamp the free end of the second piston rod 92. The second piston rod 92 is fixedly connected to the extension part 72-a as described above.

[0074] In actual use, see Figure 2-Figure 7 , when the lifting part 2 changes from the initial state ( Figure 2 The state shown) changes to the lifting state ( Figure 3 The first piston rod 3 is in the state shown in the figure, the free end of the first piston rod 3 extends into the receiving groove 12 and is held on the upper end surface of the core beam 5. The first piston rod 3 continues to push out in the vertical direction, thereby pushing the part to be lifted 2 in the direction away from the core beam 5, so as to push the part to be lifted 2 to the set position. The second piston rod 92 extends out from the cylinder body of the second hydraulic cylinder 9, driving the stopper 7 to insert into the insertion hole 55. The first piston rod 3 contracts and resets, and the stopper 7 supports the part to be lifted and keeps it in the set position. At this time, the first hydraulic cylinder 1 is not subjected to force, which prevents safety accidents caused by oil leakage in the hydraulic system.

[0075] When the lifting part 2 is in the lifting state ( Figure 3 The state shown) changes to the initial state ( Figure 2 When the lifting part 2 is in the state shown in the figure, that is, when the lifting part 2 is lowered, the first hydraulic cylinder 1 first lifts the lifting part 2 so that the lifting part 2 is spaced from the stopper 7. Then the second hydraulic cylinder 9 is made to withdraw the stopper 7. Then the first hydraulic cylinder 1 is controlled to shrink a certain distance, thereby driving the lifting part 2 to descend, until the bottom of the accommodating groove 12 is pressed on the upper end surface of the core plate beam 5. The first piston rod 3 retracts and resets. At this time, when the lifting part 2 is in the initial state, the first hydraulic cylinder 1 is not subjected to force, which prevents safety accidents caused by oil leakage in the hydraulic system.

[0076] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A truck, It is characterized in that include: A part to be lifted, a running part and a lifting device, wherein the lifting device comprises a first driving assembly, wherein the first driving assembly comprises a first driving part and a first transmission part, wherein the first driving part is fixedly arranged on the upper surface of the part to be lifted, and the free end of the first transmission part can pass through the part to be lifted in a vertical direction under the driving of the first driving part, and extend and retract through the lower surface of the part to be lifted; a bearing structure, wherein the bearing structure is used to support the part to be lifted; when the lifting device is in an initial state, the first transmission part is spaced apart from the bearing structure; When the lifting device is in a lifting state, the free end of the first transmission part extends from the lower surface of the part to be lifted and is supported on the bearing structure to drive the part to be lifted to move upward relative to the bearing structure; The part to be lifted is provided with a receiving groove, the groove opening of which is located on the lower surface of the part to be lifted; the bearing structure includes a core plate beam and a core plate, the core plate beam includes opposite upper and lower end surfaces, the core plate is fixed to the lower end surface and pressed on the running part; when the lifting device is in an initial state, the upper end surface of the core plate beam is located in the receiving groove, and the part to be lifted is supported by the receiving groove.

2. The truck according to claim 1, It is characterized in that An annular protrusion is formed around the inner wall of the accommodating groove, and the annular protrusion and the groove bottom form a receiving cavity. The free end of the first transmission part can be received in the receiving cavity to be spaced from the core plate beam.

3. The truck according to claim 1, It is characterized in that The lifting device also includes a stopper, and the core beam is provided with a socket adapted to the stopper, and the number of the sockets matches that of the stopper.

4. The truck according to claim 3, It is characterized in that At the position where the core beam contacts the receiving groove; and / or, A wear plate is provided at a position where the core beam contacts the stopper.

5. A truck according to claim 3 or 4, It is characterized in that When the lifting device is in a lifting state, part of the stop portion extends into the socket, the free end of the first transmission portion is separated from the bearing structure, at least part of the upper end surface of the stop portion abuts against the lower surface of the part to be lifted, and the lower end surface of the stop portion is supported on the bottom wall of the socket.

6. The truck according to claim 5, It is characterized in that Also includes: A second driving assembly is connected to the stopper to drive the stopper to move.

7. The truck according to claim 6, It is characterized in that The stopper comprises a cover plate, a bottom plate, and a vertical plate, and the vertical plate is fixedly connected between the cover plate and the bottom plate.

8. The truck according to claim 7, It is characterized in that The stopper comprises an extension portion, and the extension portion is formed by extending the bottom plate or the cover plate toward the second driving assembly; The second driving assembly includes a second driving portion and a second transmission portion, and the stop portion is fixedly connected to the free end of the second transmission portion through the extension portion.

9. The truck according to claim 8, It is characterized in that The free end of the second transmission part is provided with a concave cavity, the extension part is embedded in the concave cavity and is fixedly connected to the concave cavity; or, The stopper portion comprises a connecting plate, the connecting plate and the extending portion enclose a gap, the free end of the second transmission portion is embedded in the gap, and is fixedly connected to the connecting plate and the extending portion.

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