A compact device for lifting a load

Abstract

The application relates to a compact device for lifting a load. It belongs to the technical field of aerial work platforms. The application specifically comprises a chassis, a rotating table, a lifting arm and a load platform. The load platform is used for loading. One end of the lifting arm is connected with the rotating table, and the other end is connected with the load platform, and the lifting arm is used for lifting or lowering the load platform. The chassis is used for supporting the rotating table. The rotating table can rotate on the chassis and drive the load platform to rotate. The chassis is provided with a first plug-in part and a second plug-in part for plugging a lifting fork. One prong of the lifting fork is plugged into the first plug-in part, and the other prong is plugged into the second plug-in part. The first plug-in part limits one prong of the lifting fork, and the second plug-in part limits the other prong of the lifting fork. Therefore, the stability of the compact device during transportation on the lifting fork is enhanced, and the risk of the compact device falling during transportation is reduced.

Description

Technical Field

[0001] This invention relates to the field of aerial work platform technology, and more specifically to a compact device for lifting loads, also known as a crane. Background Technology

[0002] When the chassis of a lifting device has relatively small height, wheelbase (i.e., the distance between axles), and track width (i.e., the distance between wheels on the same axle) considered along the vertical axis, the lifting device is described as "compact". More specifically, when the chassis wheelbase is less than 1.7m and the track width is less than 1.2m, the lifting device is described as compact.

[0003] These compact lifting devices are typically used on trailers for transporting equipment from one location to another. However, their limited maneuverability prevents them from climbing onto the trailer alone, and the entrance ramps are often unsuitable and too steep. Therefore, a larger external lifting vehicle is usually required to mount the compact lifting device within the trailer. More specifically, this external lifting vehicle typically includes lifting forks that insert beneath the chassis of the lifting device to raise it for transport. External lifting vehicles can even be used in cases where the compact lifting device malfunctions, for example, to bring it closer to a power charging point.

[0004] However, the balance of this lifting device is not optimized for this type of transport on the lifting fork, which creates a risk that the lifting device may fall during transport. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art by providing a compact device for lifting loads, which enhances the stability of the compact device during transport on a lifting fork, thereby reducing the risk of the compact device falling during transport.

[0006] This invention proposes a compact device for lifting loads, comprising a chassis, a turntable, a lifting arm, and a load platform. The load platform is used to carry a load. One end of the lifting arm is connected to the turntable, and the other end is connected to the load platform, for lifting or lowering the load platform. The chassis supports the turntable, which can rotate on the chassis to drive the load platform to rotate. The chassis is provided with a first insertion part and a second insertion part for the lifting fork to insert into. The first insertion part and the second insertion part are located on both sides of the turntable, and at least one of the first insertion part and the second insertion part is lower than the turntable so that the fork arm of the lifting fork can be freely received at any rotation angle of the turntable.

[0007] Furthermore, the first plug-in portion and the second plug-in portion are disposed on the chassis along the longitudinal direction (X), and both the first plug-in portion and the second plug-in portion extend in a direction parallel to the transverse direction (Y).

[0008] Furthermore, the first plug-in portion and the second plug-in portion are disposed on the chassis in a transverse (Y) direction, and both the first plug-in portion and the second plug-in portion extend in a direction parallel to the longitudinal (X) direction.

[0009] Furthermore, the first insertion part is an insertion plate provided on the chassis, the insertion plate is located on one side of the turntable, and the insertion plate is provided with an insertion slot for the lifting fork to insert into.

[0010] Furthermore, the plug-in plates are a plurality of plates distributed on the chassis in a direction parallel to the transverse (Y) direction, and the plurality of plug-in plates are provided with plug-in slots through which the lifting fork passes in sequence.

[0011] Furthermore, the second insertion part is an insertion sleeve provided on the chassis. The insertion sleeve is located on the other side of the turntable. The insertion sleeve has a through hole for the lifting fork to insert into. The insertion sleeve is lower than the bottom surface of the turntable.

[0012] Furthermore, the chassis bottom is provided with front wheels and rear wheels, the front wheels and the rear wheels are used for chassis movement, the front wheels and the rear wheels are arranged longitudinally (X) at the bottom of the chassis, and the front wheels and the rear wheels both extend in a direction parallel to the transverse (Y).

[0013] Furthermore, the longitudinal (X) axle distance between the front wheel and the rear wheel is less than 1.7m, and the transverse (Y) axle distance between the front wheel and the rear wheel is less than 1.2m.

[0014] Furthermore, the first insertion portion and the second insertion portion are disposed longitudinally (X) between the front wheel and the rear wheel.

[0015] Furthermore, the first and second plug-in portions are arranged on the chassis at a first height relative to the support surface of the front or rear wheel, the chassis including at least one element arranged at a second height relative to the support surface, the second height being greater than or equal to the first height.

[0016] The present invention provides a compact device for lifting and lowering loads, which has the following advantages: (1) The compact equipment has a first plug-in part and a second plug-in part arranged on the top of the chassis along the vertical axis Z direction, and arranged on both sides of the turntable in a parallel manner for the fork arms of the lifting fork to plug in. The first plug-in part limits one fork arm of the lifting fork, and the second plug-in part limits the other fork arm of the lifting fork, thereby enhancing the stability of the aerial work device on the lifting fork and reducing the risk of the aerial work device falling during transportation. (2) At least one of the first and second plug-in parts of this compact device is lower than the turntable, which not only prevents the first and second plug-in parts from hindering the rotation of the turntable, but also allows the first and second plug-in parts to freely receive the fork arm of the lifting fork at any rotation angle of the turntable. This facilitates the lifting fork of the aerial work device to be picked up by the lifting fork of the external lifting vehicle, ensures the smooth picking up of the aerial work device, and prevents the fork arm of the lifting fork from colliding with the turntable and other parts of the chassis, which could damage the aerial work device. (3) Multiple plug-in plates extend from the top of the chassis of this compact equipment along the vertical axis Z direction. The multiple plug-in plates are distributed on the chassis along the direction parallel to the transverse Y direction. One fork of the lifting fork passes through the plug-in slots of multiple plug-in plates in sequence, so that the inner walls of multiple plug-in slots simultaneously limit the fork of the lifting fork, thereby making the transportation of this aerial work device by the lifting fork more stable and reducing the risk of the aerial work device falling during transportation. (4) The second insertion part of this compact equipment is an insertion sleeve on the chassis. The insertion sleeve is located on the other side of the turntable. The insertion sleeve has a through hole for the lifting fork to insert into, which reduces the process of making cuts on the insertion sleeve and making recesses on the turntable, making the processing of this high-altitude work device simpler and more convenient, easier to implement, and reducing processing costs. (5) This compact device receives the lifting fork arm through the complete through hole on the plug sleeve, so that when the lifting fork lifts this aerial work device, the force is more uniform, the force structure is more stable, and the limiting effect is better, which further makes the transportation of this aerial work device by the lifting fork more stable. (6) The complete through hole on the insertion sleeve of this compact device can freely accept the lifting fork arm at any rotation angle of the turntable, and there will be no interference with other parts of the turntable and chassis at the cut. This makes the insertion of the lifting fork arm smoother and the transportation of this aerial work device easier. It also prevents the lifting fork arm from colliding with other parts of the turntable and chassis during insertion, which would damage the aerial work device. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In these drawings, similar reference numerals are used to denote similar elements.

[0018] Figure 1 This is a schematic diagram of the structure of a compact device for lifting and lowering loads according to an embodiment of the present invention; Figure 2 This is a front view of a compact device for lifting and lowering loads according to an embodiment of the present invention; Figure 3 This is a top view of a compact device for lifting and lowering loads according to an embodiment of the present invention; Figure 4 This is a front view of the chassis of a compact device for lifting loads according to an embodiment of the present invention; Figure 5 This is a top view of the chassis of a compact device for lifting and lowering loads according to an embodiment of the present invention.

[0019] In the diagram: 1. Chassis; 11. Front wheel; 12. Rear wheel; 13. Connecting plate; 131. Connecting slot; 14. Connecting sleeve; 141. Through hole; 15. Steering device; 16. Drive device; 2. Turntable; 21. Vertical arm; 3. Lifting arm; 31. First end; 32. Second end; 33. First beam; 34. Second beam; 35. Hydraulic device; 4. Load platform; 41. Control device. Detailed Implementation

[0020] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-5 An embodiment of the present invention provides a compact device for lifting loads, comprising a chassis 1, a turntable 2, a lifting arm 3, and a load platform 4. The load platform 4 is used to carry a load. One end of the lifting arm 3 is connected to the turntable 2, and the other end is connected to the load platform 4, for lifting or lowering the load platform 4. The chassis 1 is used to support the turntable 2, and the turntable 2 can rotate on the chassis 1 to drive the load platform 4 to rotate. The chassis 1 is provided with a first insertion part and a second insertion part for the lifting fork to insert into.

[0022] In this application, the compact device includes a chassis 1, a turntable 2, a lifting arm 3, and a load platform 4. Items to be transferred are placed on the load platform 4, and operators stand on it. The lifting arm 3 connects the load platform 4 to the turntable 2. Raising or lowering the lifting arm 3 causes the load platform 4 to rise or fall on the turntable 2, thus achieving the lifting and lowering of people or items on the load platform 4. The chassis 1 supports the turntable 2, and the turntable 2 can rotate on the chassis 1. The rotation of the turntable 2 on the chassis 1 drives the rotation of the load platform 4, thereby achieving the transfer of people or items on the load platform 4.

[0023] The chassis 1 extends along the transverse Y direction and along the longitudinal X direction, which is perpendicular to the transverse Y direction. Front wheels 11 and rear wheels 12 are disposed at the bottom of the chassis 1 for movement. The front wheels 11 and rear wheels 12 are disposed along the longitudinal X direction at the bottom of the chassis 1 and both extend in a direction parallel to the transverse Y direction. The chassis 1 also houses steering devices 15 for steering the front wheels 11 and rear wheels 12, thereby enabling the movement of the compact equipment. These steering devices 15 are conventional and will not be described in more detail.

[0024] The device used for lifting loads in this application is compact, meaning the axle distance between the front wheel 11 and the rear wheel 12 along the longitudinal direction X is less than 1.7m, and the distance between the front wheel 11 and the rear wheel 12 along the transverse direction Y is less than 1.2m. The turntable 2 houses operating components and counterweights. The operating components specifically include electronic components, hydraulic cabinets, batteries, power cables, and / or rigid and / or flexible pipes for transporting fluids.

[0025] It is foreseeable that this compact device also includes a rotating shaft for rotatably connecting the turntable 2 to the chassis 1, and a drive unit 16 connected to the rotating shaft for rotating the turntable 2 about the vertical axis Z is housed in the chassis 1. These drive units 16 are conventional and therefore will not be described in more detail.

[0026] The compact device includes a vertically movable vertical arm 21 between a retracted position in the turntable 2 and an extended position, preferably a telescopic arm. The compact device also includes a lifting arm 3, with one end of the lifting arm 3 connected to the vertical arm 21 as a first end 31 and the other end connected to the load platform 4 (e.g., a conventional type platform) as a second end 32, and the lifting arm 3 can extend between the first end 31 and the second end 32.

[0027] In the described example, the lifting arm 3 is connected to the vertical arm 21 via a joint, and the lifting arm 3 can rotate about this joint while keeping the load platform 4 horizontal. For example, the lifting arm 3 conventionally includes a first beam 33 and a second beam 34 parallel to each other. Both the first beam 33 and the second beam 34 are connected to the vertical arm 21 at a first end 31 via a first pivot link having an axis perpendicular to the vertical axis Z, and to the load platform 4 at a second end 32 via a second pivot link having an axis parallel to the axis of the first pivot link.

[0028] Therefore, on the one hand, the load platform 4 can be moved in the height direction by extending the vertical arm 21; on the other hand, the load platform 4 can be moved in the height direction by rotating the lifting arm 3 around its joint and the vertical arm 21. Conventionally, the load platform 4 includes a control device 41 for controlling the compact equipment. The control device 41 is connected via cables entering the lifting arm 3 to operating components housed in the turntable 2, as well as a drive unit 16 and a steering unit 15 housed in the chassis 1. The operation of these control devices 41 is conventional and will not be described in more detail.

[0029] Alternatively, the lifting arm 3 can be any other known type.

[0030] In addition, the compact device includes conventional means for moving the lifting arm 3, such as a hydraulic device 35 that enables the lifting arm 3 to rotate about a joint at its first end 31.

[0031] Because such compact devices are typically used in locations requiring trailer transport from one point of use to another, and because their limited mobility prevents them from climbing onto such trailers independently, a larger external lifting vehicle is usually needed to transfer the compact device to the trailer. More specifically, this external lifting vehicle typically includes lifting forks that insert beneath the chassis 1 of the compact device to lift it for transport. The external lifting vehicle can even be used in cases where the compact device malfunctions, to move it closer to a power charging point.

[0032] In this application, the specific structure of the external lifting vehicle can be referenced, for example, to Chinese Utility Model Patent Publication No. CN218231725U, entitled "A Forklift". Because the lifting fork is inserted below the chassis 1 of the compact equipment, and the compact equipment is not secured to the lifting fork during transport, there is a risk that the compact equipment may fall during transport.

[0033] Therefore, in this application, a first insertion part and a second insertion part are arranged on the top of the chassis 1 along the vertical axis Z, and are arranged on both sides of the turntable 2 in a parallel manner. One fork arm of the lifting fork is inserted into the first insertion part, and the other fork arm is inserted into the second insertion part, so that the lifting fork lifts the compact equipment for transportation. During this process, the first insertion part limits one fork arm of the lifting fork, and the second insertion part limits the other fork arm of the lifting fork, thereby enhancing the stability of the compact equipment during transportation on the lifting fork and reducing the risk of the compact equipment falling during transportation.

[0034] In the first embodiment shown in the accompanying drawings: the first plug-in portion and the second plug-in portion are arranged on the chassis 1 along the longitudinal direction X, and both the first plug-in portion and the second plug-in portion extend in a direction parallel to the transverse direction Y (in other words, the first plug-in portion and the second plug-in portion are arranged one in front of the other on the chassis 1, and the lifting fork picks up the compact device from the left or right side of the chassis 1).

[0035] In a second embodiment not shown in the accompanying drawings: the first and second insertion portions are disposed on the chassis 1 along the transverse Y direction, and both the first and second insertion portions extend in a direction parallel to the longitudinal X direction. (In other words, the first and second insertion portions are disposed on the chassis 1, one on the left and one on the right, and the lifting fork picks up the compact device from the front or rear side of the chassis 1).

[0036] It should be noted that for compact equipment, there is limited space on the chassis 1 to arrange the first and second connectors. Specifically, the drive unit 16, connected to the pivot shaft and used to rotate the turntable 2 about the vertical axis Z, is housed in the chassis 1. The drive unit 16 includes a large crown gear and gear system and is required for guiding the installation of power cables and hydraulic hoses so that they do not stretch or become damaged during the rotation of the turntable 2. All these components are particularly large, making it difficult to arrange the first and second connectors on the chassis 1.

[0037] Furthermore, the chassis 1 includes a steering device 15 located above the rear wheels 12 for steering the front wheels 11 and rear wheels 12, preventing the space from being used to arrange the first and second connectors. However, arranging the first and second connectors above the steering device 15 would result in them being too high, affecting the steering and transport of the compact equipment by the external lifting vehicle after it has picked it up. In fact, the smaller the distance between the first and second connectors and the ground, the less height the lifting forks need to lift the compact equipment off the ground after it has been picked up by the external lifting vehicle. This also lowers the center of gravity of the compact equipment during transport, making its transfer more convenient and stable.

[0038] Therefore, in this application, the first and second connectors are arranged on the chassis 1 at a first height relative to the support surface of the front wheel 11 or the rear wheel 12. The chassis 1 includes at least one element arranged at a second height relative to the support surface, such that the second height is greater than or equal to the first height. In other words, the height of the first and second connectors does not exceed the height of the chassis 1. In the described example, the aforementioned element arranged at the second height is a steering device 15 for steering the front wheel 11 and the rear wheel 12.

[0039] Furthermore, the first and second connectors are preferably positioned longitudinally between the front wheel 11 and the rear wheel 12 on the chassis 1, taking the first embodiment as an example. The distance between the first and second connectors is a predetermined distance, equal to the distance between the two forks of the lifting fork of the external lifting vehicle used to transport compact equipment.

[0040] Since the turntable 2 is connected to the drive unit 16 in the chassis 1 via a rotating shaft, it is used to rotate the turntable 2 around the vertical axis Z on the chassis 1. The turntable 2 houses the operating components and the counterweight, so the diameter of the turntable 2 is relatively large relative to the diameter of the rotating shaft. It should be noted that, limited by the axle spacing between the front wheel 11 and the rear wheel 12 along the longitudinal direction X, the first and second insertion parts located between the front wheel 11 and the rear wheel 12 along the longitudinal direction X cannot both avoid the projection range of the turntable 2 in the top view direction. That is, at least one of the first and second insertion parts will overlap with the projection range of the turntable 2 in the top view direction. Therefore, the first or second insertion part extending along the vertical axis Z on the chassis 1 may obstruct the rotation of the turntable 2.

[0041] The existing Chinese invention patent CN107108189B, published on 2019-01-11, discloses a compact device for lifting loads and fixed for transport on forks. The device has a chassis 1 with a first sleeve and a second sleeve, each capable of receiving a corresponding fork arm. The first and second sleeves limit the fork arms of the lifting fork, preventing the compact device from falling during transport. Simultaneously, the second sleeve has a central cutout facing a turntable, and the turntable includes at least one recess such that at at least one first corner of the turntable, the recess coincides with the cutout, allowing the second sleeve to freely receive the fork arm. At at least one second corner of the turntable, the turntable partially extends into the cutout, blocking the second sleeve, thus ensuring that the arrangement of the first and second sleeves does not obstruct the free rotation of the turntable.

[0042] In this application, when the first and second plug-in portions are arranged longitudinally X between the front wheel 11 and the rear wheel 12, at least one of the first and second plug-in portions is lower than the turntable 2, so that the first and second plug-in portions extending along the vertical axis Z on the chassis 1 are not on the rotation path of the turntable 2, thereby not hindering the rotation of the turntable 2 on the chassis 1 and ensuring the normal use of this compact device.

[0043] Compared to the existing technology, where the second sleeve can only freely receive the fork arm at the first corner position of the turntable 2, the turntable 2 of the compact equipment needs to be stopped at the first corner position before each forklift operation, making the transfer of the compact equipment more difficult. Furthermore, if a misoperation occurs during production and the turntable 2 is not rotated to the correct position before forking, not only will the fork arm fail to insert properly into the second sleeve, resulting in forking failure, but more seriously, the lifting fork arm may collide with the turntable 2 and other components of the chassis 1, potentially damaging the compact equipment and significantly increasing production costs.

[0044] In this application, at least one of the first and second connectors is lower than the turntable 2. This not only ensures that the first and second connectors do not obstruct the rotation of the turntable 2, but also allows the first and second connectors to freely receive the lifting fork arms at any rotation angle of the turntable 2. This facilitates the lifting fork of the compact device from an external lifting vehicle, ensuring smooth lifting of the compact device and preventing the lifting fork arms from colliding with the turntable 2 and other components of the chassis 1, which could damage the compact device.

[0045] Taking the first embodiment as an example, in this application, the first insertion part is an insertion plate 13 provided on the chassis 1. The insertion plate 13 is located on one side of the turntable 2, and the insertion plate 13 is provided with an insertion groove 131 for the lifting fork to insert into. The insertion plate 13 extends from the top of the chassis 1 along the vertical axis Z. The insertion plate 13 is provided with an insertion groove 131 for one fork arm of the lifting fork to insert into. Thus, when one fork arm of the lifting fork is inserted into the insertion groove 131, the inner wall of the insertion groove 131 limits the fork arm, making the transportation of this compact equipment more stable and reducing the risk of the compact equipment falling during transportation.

[0046] Furthermore, multiple connector plates 13 extend from the top of the chassis 1 along the vertical axis Z. The multiple connector plates 13 are distributed on the chassis 1 along a direction parallel to the transverse Y. One fork of the lifting fork passes through the connector slots 131 of the multiple connector plates 13 in sequence, so that the inner walls of the multiple connector slots 131 simultaneously limit the fork of the lifting fork, thereby making the transportation of this compact equipment by the lifting fork more stable and reducing the risk of the compact equipment falling during transportation.

[0047] Taking the first embodiment as an example, in this application, the second insertion part is an insertion sleeve 14 provided on the chassis 1. The insertion sleeve 14 is located on the other side of the turntable 2. The insertion sleeve 14 has a through hole 141 for the lifting fork to insert into. The insertion sleeve 14 is lower than the bottom surface of the turntable 2. The insertion sleeve 14 is provided on the top of the chassis 1 along the vertical axis Z. The insertion sleeve 14 and the insertion plate 13 are arranged parallel to each other along the transverse Y direction. The insertion plate 13 is located on one side of the turntable 2, and the insertion sleeve 14 is located on the other side of the turntable 2.

[0048] A through hole 141 is provided in the plug sleeve 14. One fork of the lifting fork passes through the plug slots 131 of multiple plug plates 13 in sequence, and the other fork is inserted into the through hole 141 of the plug sleeve 14. The inner wall of the plug slots 131 of the multiple plug plates 13 limits one fork, and the inner wall of the through hole 141 limits the other fork. Thus, when the lifting fork lifts the compact equipment for transportation, the stability of the compact equipment on the lifting fork is enhanced, and the risk of the compact equipment falling during transportation is reduced.

[0049] Due to the size limitations of the chassis 1, the plug-in plates 13 and plug-in sleeves 14 located on both sides of the turntable 2 cannot both avoid the projection range of the turntable 2 in the top view direction. In this application, it is preferable that when the plug-in plates 13 are arranged on the chassis 1, they do not overlap with the projection range of the turntable 2 in the top view direction, while when the plug-in sleeves 14 are arranged on the chassis 1, they overlap with the projection range of the turntable 2 in the top view direction, and the plug-in sleeves 14 are lower than the bottom surface of the turntable 2, thereby preventing interference between the plug-in sleeves 14 and the rotation of the turntable 2.

[0050] Compared to existing technologies, the second sleeve has a central cut facing the turntable, and the turntable includes at least one recess such that the recess coincides with the cut at at least one first corner position of the turntable, allowing the second sleeve to freely receive the fork arm without obstructing the operation of the turntable. In this application, the insertion sleeve 14 is located below the bottom surface of the turntable 2, and the fork arm of the lifting fork is received through a complete through hole 141 on the insertion sleeve 14. On the one hand, this reduces the steps of making cuts on the insertion sleeve 14 and making recesses on the turntable 2, making the processing of this compact device simpler and more convenient, easier to implement, and reducing processing costs.

[0051] On the other hand, by receiving the lifting fork arm through the complete through hole 141 on the insert sleeve 14, the lifting fork is more evenly stressed, the stress structure is more stable, and the limiting effect is better when it lifts the compact equipment, thus making the transportation of the compact equipment by the lifting fork more stable.

[0052] On the other hand, the complete through hole 141 on the insertion sleeve 14 can freely accept the lifting fork arm at any rotation angle of the turntable 2, without causing interference with other components of the turntable 2 and chassis 1 at the cut. This makes the insertion of the lifting fork arm smoother and the transportation of this compact equipment easier. It also prevents the lifting fork arm from colliding with other components of the turntable 2 and chassis 1 during insertion, thus preventing damage to this compact equipment.

[0053] In this application, the insertion sleeve 14 is lower than the bottom surface of the turntable 2. This includes the turntable 2 as shown in the attached figure being located above the insertion sleeve 14, with the insertion sleeve 14 being lower than the bottom plane of the turntable 2. It also includes, without interfering with the insertion sleeve 14, the bottom surface of the turntable 2 including a bottom plane and an inclined or curved surface connecting the bottom plane to the main body of the turntable 2. The top of the inclined or curved surface extends above the insertion sleeve 14, and the bottom extends below the insertion sleeve 14, so that the inclined or curved surface avoids the insertion sleeve 14, and the bottom plane of the turntable 2 is lower than the insertion sleeve 14.

[0054] Since the diameter of the turntable 2 is much larger than the diameter of the shaft, the plug-in plate 13 on one side of the turntable 2 does not coincide with the projection range of the turntable 2 in the top view. The plug-in sleeve 14 on the other side of the turntable 2 coincides with the projection range of the turntable 2 in the top view, but does not coincide with the projection range of the shaft in the top view. Furthermore, the plug-in sleeve 14 is lower than the bottom surface of the turntable 2. As a result, when the turntable 2 rotates on the chassis 1 via the shaft, the plug-in plate 13 and the plug-in sleeve 14 will not interfere with the turntable 2 or with the shaft connecting the turntable 2 and the chassis 1.

[0055] The above-described contents can be implemented individually or in various combinations, and these variations are all within the protection scope of this invention.

[0056] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A compact device for lifting and lowering loads, comprising a chassis (1), a turntable (2), a lifting arm (3), and a load platform (4), wherein the load platform (4) is used to carry a load, one end of the lifting arm (3) is connected to the turntable (2), and the other end is connected to the load platform (4), for lifting or lowering the load platform (4), the chassis (1) is used to support the turntable (2), and the turntable (2) is rotatable on the chassis (1) to drive the load platform (4) to rotate; characterized in that, The chassis (1) is provided with a first insertion part and a second insertion part for inserting the fork arm of the lifting fork. The first insertion part and the second insertion part are located on both sides of the turntable (2), and at least one of the first insertion part and the second insertion part is lower than the turntable (2) so that the fork arm of the lifting fork can be freely received at any rotation angle of the turntable (2). The first plug-in portion and the second plug-in portion are disposed on the chassis (1) along the longitudinal direction (X), and both the first plug-in portion and the second plug-in portion extend in a direction parallel to the transverse direction (Y); The first plug-in part is a plug-in plate (13) provided on the chassis (1). The plug-in plate (13) is located on one side of the turntable (2). The plug-in plate (13) is provided with a plug-in groove (131) for the lifting fork to plug in. The second insertion part is an insertion sleeve (14) provided on the chassis (1). The insertion sleeve (14) is located on the other side of the turntable (2). The insertion sleeve (14) is provided with a through hole (141) for the lifting fork to insert. The insertion sleeve (14) is lower than the bottom surface of the turntable (2).

2. The compact device for lifting and lowering loads as described in claim 1, characterized in that: The plug-in plates (13) are a plurality of those distributed on the chassis (1) in a direction parallel to the transverse (Y) direction, and the plurality of plug-in plates (13) are provided with plug-in slots (131) through which the lifting forks pass in sequence.

3. The compact device for lifting and lowering loads as described in claim 1, characterized in that: The chassis (1) is provided with a front wheel (11) and a rear wheel (12) at the bottom. The front wheel (11) and the rear wheel (12) are used for the chassis (1) to move. The front wheel (11) and the rear wheel (12) are arranged at the bottom of the chassis (1) along the longitudinal direction (X), and both the front wheel (11) and the rear wheel (12) extend in a direction parallel to the transverse direction (Y).

4. The compact device for lifting and lowering loads as described in claim 3, characterized in that: The longitudinal (X) axle distance between the front wheel (11) and the rear wheel (12) is less than 1.7m, and the transverse (Y) axle distance between the front wheel (11) and the rear wheel (12) is less than 1.2m.

5. A compact device for lifting and lowering loads as described in claim 4, characterized in that: The first and second connectors are disposed longitudinally (X) between the front wheel (11) and the rear wheel (12).

6. The compact device for lifting and lowering loads as described in claim 3, characterized in that: The first and second plug-in portions are arranged on the chassis (1) at a first height relative to the support surface of the front wheel (11) or the rear wheel (12), the chassis (1) including at least one element arranged at a second height relative to the support surface, the second height being greater than or equal to the first height.

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