Hydraulic lifting mechanism with dynamically changed gravity center

Abstract

The hydraulic lifting mechanism comprises a hydraulic rod and a bracket connected to a bottom frame through a shear fork assembly, the shear fork assembly comprises a first fork rod and a second fork rod, the middles of the first fork rod and the second fork rod are hinged together through a middle hinged shaft, the lower end of the first fork rod is hinged to the bottom frame, and the upper end of the first fork rod is slidably connected with the bracket; the upper end of the second fork rod is hinged to the bracket, the lower end of the second fork rod is in sliding connection with the bracket, the bracket comprises a main frame matched with the shear fork assembly, a sliding frame arranged on the main frame and a carrier connected to the sliding frame in a sliding mode, a vertical linkage push rod with a vertical sliding groove formed in the lower end is fixedly connected to the lower surface of the geometric center of the carrier, and a middle hinged shaft penetrates through the vertical sliding groove. The lifting device has the advantage that the gravity center of a lifted object is always maintained at the geometric center of the supporting surface, and solves the problem that the lifting device is easy to damage due to the fact that the gravity center of the object is not changed when the shear fork assembly translates on one side when the shear fork assembly translates on one side in the lifting process of an existing lifting device.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic lifting vehicles, and in particular to a hydraulic lifting mechanism with a dynamically changing center of gravity. Background Art

[0002] A hydraulic lift is a device that uses a hydraulic mechanism to lift materials and is equipped with rollers for transportation.

[0003] For example, the Chinese patent application authorization announcement number is CN218058306U, and the utility model patent entitled "A Mecanum wheel light hydraulic lift for archives" was authorized and announced on December 16, 2022. The application includes a device bottom plate, and the front and rear ends of the bottom of the device bottom plate are fixedly connected to support beams, and the two ends of the two support beams are fixedly connected to support longitudinal beams. The bottoms of the two support longitudinal beams are fixedly connected to a driving mechanism, and two first fixed shafts and second fixed shafts are fixedly connected between the two support beams. The outer wall of the second fixed shaft is rotatably connected to a hydraulic cylinder, and the output end of the hydraulic cylinder is fixedly connected to a rotating block. A lifting mechanism is rotatably connected between the two first fixed shafts, and the top of the lifting mechanism is rotatably connected to a lifting platform. The lifting mechanism adopts a scissor assembly.

[0004] The deficiencies of the prior art are: 1. The hydraulic cylinder is connected to a single fork rod of the scissor assembly, which is subject to a large bending moment and is easily deformed and damaged; 2. The center of gravity of the lifting platform cannot be adjusted. When the scissor assembly is raised or lowered, the lateral positions of the two ends of the scissor assembly change, causing the support position of the scissor assembly to change, making it easy for the lifting platform to tip over. Summary of the invention

[0005] The present invention aims to provide a hydraulic lifting mechanism that can realize dynamic changes of the center of gravity by mechanical linkage, thereby solving the problem that the center of gravity of the object remains unchanged during the lifting process of the existing lifting device, and the center of gravity of the object is easily deviated from the center of the scissors-fork assembly when the scissors-fork assembly is unilaterally translated, causing the lifting device to be easily damaged.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a hydraulic lifting mechanism with a dynamic change of center of gravity, characterized in that it includes a hydraulic cylinder, a base frame, a scissor-fork assembly connected to the base frame and a bracket arranged at the upper end of the scissor-fork assembly, the hydraulic cylinder is extended and retracted to drive the scissor-fork assembly to drive the bracket to lift and lower, the scissor-fork assembly includes a first fork rod and a second fork rod hinged together through a middle hinge shaft in the middle part, the lower end of the first fork rod is hinged to the base frame, the upper end of the first fork rod is slidably connected to the bracket, the upper end of the second fork rod is hinged to the bracket, and the lower end of the second fork rod is slidably connected to the bracket, the scissor-fork assembly has two, and the two scissor-fork assemblies are distributed along the extension direction of the middle hinge shaft, the bracket includes a main frame cooperating with the scissor-fork assembly, a sliding frame arranged on the main frame, and a carrier slidably connected to the sliding frame, a vertical linkage push rod is fixedly connected to the lower surface at the geometric center of the carrier, a vertical sliding groove is provided at the lower end of the vertical linkage push rod, and the middle hinge shaft is penetrated in the vertical sliding groove. When in use, the object to be lifted is supported on the carrier, and the center of gravity of the object to be lifted is vertically aligned with the geometric center of the carrier. During the lifting process, the middle hinge shaft rises and translates, and the middle hinge shaft drives the carrier to move synchronously through the vertical linkage push rod, and the center of gravity of the object to be lifted is always located above the middle hinge shaft, so that the scissor lift assembly is always evenly stressed, the bracket is not easy to tip over, and the force is evenly applied and not easily damaged.

[0007] Preferably, the first fork rods in the two scissor fork assemblies are connected together by a cylinder support rod, the distance between the cylinder support rod and the middle hinge shaft is less than 20 cm, one end of the hydraulic cylinder is hinged on the cylinder support rod, and the other end is hinged on the upper end of one of the first fork rods. When the hydraulic cylinder is driven, the force point of the middle breaking force of the scissor fork assembly is close to the middle hinge shaft, so that the fork rod is not easy to break.

[0008] Preferably, there are two hydraulic cylinders, and the upper ends of the two hydraulic cylinders are hinged to the upper ends of the telescopic first fork rods of the two scissor fork assemblies one by one, so as to make the lifting of the bracket more stable.

[0009] Preferably, the oil cylinder support rod is fixed on the lower side of the second fork rod, and the first fork rod is located outside the second fork rod. The oil cylinder support rod can conveniently realize the separation and combination of the two fork rods without interfering.

[0010] Preferably, two reinforcing plates are provided at both ends of the oil rod support rod and fixedly connected to the inner side surfaces of the two second fork rods in a one-to-one correspondence with each other in the horizontal direction, so as to improve the structural strength.

[0011] Preferably, a first slide rail is provided on the lower side of the main frame, the upper end of the first fork rod is rotatably connected to a first roller supported on the lower side of the first slide rail, a second slide rail is provided on the upper side of the bottom frame, and the lower end of the second fork rod is rotatably connected to a second roller supported on the upper side of the second slide rail. The lifting can slide smoothly.

[0012] Preferably, a first slide groove is provided on the lower surface of the first slide rail, the first roller is supported in the slide groove, and a second slide groove is provided on the upper surface of the second slide rail, the second roller is supported in the second slide groove. Derailment is not likely to occur.

[0013] Preferably, the lower ends of the two second fork rods are connected together by a synchronization rod, so as to coordinate the consistency of the lifting speed when the two scissor-fork assemblies are opened and closed for lifting.

[0014] Preferably, the main frame is a rectangular frame structure, the sliding frame is a rectangular frame structure, and the load carrier is provided with a plurality of maintenance operation holes, so that the bottom operation of the lifted object can be conveniently performed under the bracket, such as operation under the car.

[0015] Preferably, the middle hinge shafts of the two scissor-fork assemblies are arranged one by one at the two ends of the hydraulic cylinder support rod. The structure is compact, and the two scissor-fork assemblies can be effectively connected as a whole, so that the stability during lifting is good.

[0016] Beneficial effect: When supporting, the center of gravity of the lifted object is always maintained at the geometric center of the supporting plane of the lifting structure, and the stability is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the three-dimensional structure of the first embodiment of the present invention;

[0018] Figure 2 It is the osmotic pressure of the three-dimensional structure of the second embodiment of the present invention.

[0019] In the figure: base frame 1, hydraulic cylinder 2, scissor assembly 3, middle hinge shaft 4, first fork rod 5, second fork rod 6, main frame 7, sliding frame 8, loading rack 9, cylinder support rod 10, lower hinge block 11, upper hinge block 12, reinforcement plate 13, first slide rail 14, first roller 15, second slide rail 16, second roller 17, first slide groove 18, second slide groove 19, vertical linkage push rod 20, vertical slide groove 21, synchronization rod connecting hole 22. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0021] Example 1, see Figure 1A hydraulic lifting mechanism with a dynamically changing center of gravity comprises a base frame 1, a hydraulic cylinder 2, a scissor assembly 3 connected to the base frame, and a bracket arranged at the upper end of the scissor assembly. The hydraulic cylinder is extended and retracted to drive the scissor assembly to drive the bracket to rise and fall. There are two scissor assemblies. The scissor assembly comprises a first fork rod 5 and a second fork rod 6 hinged together in the middle through a middle hinge shaft 4, the lower end of the first fork rod is hinged to the base frame, the upper end of the first fork rod is slidably connected to the bracket, the upper end of the second fork rod is hinged to the bracket, and the lower end of the second fork rod is slidably connected to the bracket. The two scissor assemblies are distributed along the extension direction of the middle hinge shaft and supported at both ends of the bracket. The bracket comprises a main frame 7 cooperating with the scissor assembly, a sliding frame 8 arranged on the main frame, and a carrier 9 slidably connected to the sliding frame. The main frame is a rectangular frame structure. The sliding frame is a rectangular frame structure. A number of maintenance operation holes are provided on the carrier. The second fork rods in the two scissor-type assemblies are connected together through the oil cylinder support rod 10, and the distance between the oil cylinder support rod and the middle hinge shaft is less than 20 cm. In this embodiment, the middle hinge shafts of the two scissor-type assemblies are arranged at both ends of the oil cylinder support rod in a one-to-one correspondence. One end of the hydraulic cylinder is hinged to the oil cylinder support rod through the lower hinge block 11, and the other end is hinged to the upper end of a first fork rod through the upper hinge block 12. There are two hydraulic cylinders, and the upper ends of the two hydraulic cylinders are hinged to the upper ends of the telescopic first fork rods of the two scissor-type assemblies in a one-to-one correspondence. The oil cylinder support rod is fixed on the lower side of the second fork rod, and the first fork rod is located on the outer side of the second fork rod. Two reinforcing plates 13 are provided at both ends of the oil rod support rod, which are fixed together with the inner side surfaces of the two second forks in a one-to-one correspondence in the horizontal direction. A first slide rail 14 is provided on the lower side of the main frame, a first roller 15 supported on the lower side of the first slide rail is rotatably connected to the upper end of the first fork rod, a second slide rail 16 is provided on the upper side of the bottom frame, and a second roller 17 supported on the upper side of the second slide rail is rotatably connected to the lower end of the second fork rod. A first slide groove 18 is provided on the lower surface of the first slide rail, and the first roller is supported in the slide groove. A second slide groove 19 is provided on the upper surface of the second slide rail, and the second roller is supported in the second slide groove. The lower ends of the two second fork rods are connected together by a synchronization rod (not shown in the figure). The two ends of the synchronization rod are connected to the synchronization rod connection holes 22 on the two second fork rods in a one-to-one correspondence.

[0022] When in use, the hydraulic cylinder is extended and retracted to realize the opening and closing of the scissor assembly, thereby driving the bracket to rise and fall, thereby realizing the lifting and lowering of the object.

[0023] Embodiment 2 is different from Embodiment 1 in that:

[0024] See also Figure 2 A vertical linkage push rod 20 is fixedly connected to the lower surface at the geometric center of the loading rack, and a vertical slide groove 21 is provided at the lower end of the vertical linkage push rod, and the middle hinge shaft is passed through the vertical slide groove (actually, a connecting section coaxial with the middle hinge shaft is provided on the cylinder support rod, and the middle hinge shaft is indirectly located in the middle hinge shaft by passing the connecting section through the vertical slide groove).

[0025] When in use, the object to be lifted is supported on the carrier, and the center of gravity of the object to be lifted is vertically aligned with the geometric center of the carrier. During the lifting process, the middle hinge shaft rises and translates, and the middle hinge shaft drives the carrier to move synchronously through the vertical linkage push rod, and the center of gravity of the object to be lifted is always located above the middle hinge shaft, so that the scissor lift assembly is always evenly stressed, the bracket is not easy to tip over, and the force is evenly applied and not easily damaged.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic lifting mechanism with a dynamically changing center of gravity, characterized in that: The invention comprises a base frame, a hydraulic cylinder, a scissor assembly connected to the base frame and a bracket arranged at the upper end of the scissor assembly. The hydraulic cylinder is extended and retracted to drive the scissor assembly to drive the bracket to rise and fall. The scissor assembly comprises a first fork rod and a second fork rod hinged together through a middle hinge shaft in the middle part. The lower end of the first fork rod is hinged to the base frame, the upper end of the first fork rod is slidably connected to the bracket, the upper end of the second fork rod is hinged to the bracket, and the lower end of the second fork rod is slidably connected to the bracket. There are two scissor assemblies, and the two scissor assemblies are distributed along the extension direction of the middle hinge shaft. The bracket comprises a A main frame, a sliding frame arranged on the main frame, and a carrier frame slidably connected to the sliding frame, a vertical linkage push rod is fixedly connected to the lower surface of the carrier frame at the geometric center, a vertical sliding groove is provided at the lower end of the vertical linkage push rod, and the middle hinge shaft is passed through the vertical sliding groove; when in use, the lifted object is supported on the carrier frame, and the center of gravity of the lifted object is vertically aligned with the geometric center of the carrier frame, and the middle hinge shaft rises and translates during the lifting process, and the middle hinge shaft drives the carrier frame to move synchronously through the vertical linkage push rod so that the center of gravity of the lifted object is always located above the middle hinge shaft.

2. The hydraulic lifting mechanism with dynamic center of gravity change according to claim 1 is characterized in that: The second fork rods in the two scissor-type fork assemblies are connected together through a cylinder support rod, and the distance between the hydraulic cylinder support rod and the middle hinge axis is less than 20 cm. One end of the hydraulic cylinder is hinged to the cylinder support rod, and the other end is hinged to the upper end of one of the first fork rods.

3. The hydraulic lifting mechanism with dynamic center of gravity change according to claim 2 is characterized in that: There are two hydraulic cylinders, and the upper ends of the two hydraulic cylinders are hinged to the upper ends of the telescopic first fork rods of the two scissor-fork assemblies in a one-to-one correspondence.

4. The hydraulic lifting mechanism with dynamic center of gravity change according to claim 2 or 3, characterized in that: The oil cylinder support rod is fixed on the lower side of the second fork rod, and the first fork rod is located on the outer side of the second fork rod.

5. The hydraulic lifting mechanism with dynamic center of gravity change according to claim 4, characterized in that: Two reinforcing plates are provided at both ends of the oil rod support rod and are fixedly connected with the inner side surfaces of the two second fork rods in a horizontal direction in a one-to-one correspondence.

6. The hydraulic lifting mechanism with dynamic center of gravity change according to claim 1, 2 or 3, characterized in that: A first slide rail is provided on the lower side of the main frame, and the upper end of the first fork rod is rotatably connected to a first roller supported on the lower side of the first slide rail. A second slide rail is provided on the upper side of the base frame, and the lower end of the second fork rod is rotatably connected to a second roller supported on the upper side of the second slide rail.

7. The hydraulic lifting mechanism with dynamic center of gravity change according to claim 6, characterized in that: A first slide groove is provided on the lower surface of the first slide rail, and the first roller is supported in the slide groove. A second slide groove is provided on the upper surface of the second slide rail, and the second roller is supported in the second slide groove.

8. The hydraulic lifting mechanism with dynamic center of gravity change according to claim 1, 2 or 3, characterized in that: The lower ends of the two second fork rods are connected together through a synchronization rod.

9. The hydraulic lifting mechanism with dynamic center of gravity change according to claim 1, 2 or 3, characterized in that: The main frame is a rectangular frame structure, the sliding frame is a rectangular frame structure, and the object carrier is provided with a plurality of maintenance operation holes.

10. The hydraulic lifting mechanism with dynamic center of gravity change according to claim 2 or 3, characterized in that: The middle hinge shafts of the two scissor-fork assemblies are arranged at the two ends of the hydraulic rod support rod in a one-to-one correspondence.

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