Hydraulic lifting mechanism of mechanical linkage adjusting center

Abstract

The hydraulic lifting mechanism of the mechanical linkage adjusting center 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 connected with the bracket in a sliding mode. 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 easy to deviate from the center of a shear fork assembly when the shear fork assembly translates on one side because the gravity center of the object is not changed in the lifting process of the existing lifting device.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic lifting vehicle technology, and in particular to a hydraulic lifting mechanism with a mechanical linkage adjustment center. Background Technology

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

[0003] For example, the utility model patent entitled "A Mecanum Wheel Light Hydraulic Lifting Vehicle for Archives" (Chinese Patent Application Publication No. CN218058306U, published on December 16, 2022) includes a device base plate. Support beams are fixedly connected to both ends of the bottom of the base plate. Support longitudinal beams are fixedly connected to both ends of the two support beams. A drive mechanism is fixedly connected to the bottom of the two longitudinal beams. Two first fixed shafts and a second fixed shaft are fixedly connected between the two support beams. A hydraulic cylinder is rotatably connected to the outer wall of the second fixed shaft. A rotating block is fixedly connected to the output end of the hydraulic cylinder. A lifting mechanism is rotatably connected between the two first fixed shafts. A lifting platform is rotatably connected to the top of the lifting mechanism. The lifting mechanism uses a scissor lift assembly.

[0004] The shortcomings of the existing technology are as follows: 1. The hydraulic cylinder is connected to a single fork of the scissor lift assembly. The fork is subjected to a large bending moment and is prone to deformation and damage; 2. The center of gravity of the lifting platform cannot be adjusted. When the scissor lift assembly is raised or lowered, the lateral positions of the two ends of the scissor lift assembly change, which changes the support position of the scissor lift assembly and makes it easy for the lifting platform to tip over. Utility Model Content

[0005] This utility model aims to provide a hydraulic lifting mechanism with mechanical linkage adjustment center, which solves the problem that when the center of gravity of the object remains unchanged during the lifting process of the existing lifting device, the center of gravity of the object is prone to deviate from the center of the scissor assembly when the scissor assembly is translated on one side, which leads to easy damage to the lifting device.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a hydraulic lifting mechanism for a mechanical linkage adjustment center, characterized in that it includes a hydraulic cylinder, a base frame, a scissor lift assembly connected to the base frame, and a bracket disposed on the upper end of the scissor lift assembly. The hydraulic cylinder extends and retracts to drive the scissor lift assembly to lift the bracket. The scissor lift assembly includes a first fork and a second fork hinged together at their middle portions via a central hinge shaft. The lower end of the first fork is hinged to the base frame, and the upper end of the first fork is slidably connected to the bracket. The upper end of the second fork is hinged to the bracket, and the lower end of the second fork is slidably connected to the bracket. There are two scissor lift assemblies, distributed along the extension direction of the central hinge shaft. The bracket includes a main frame that cooperates with the scissor lift assembly, a sliding frame disposed on the main frame, and a load-bearing frame slidably connected to the sliding frame. A vertical linkage push rod is fixedly connected to the lower surface at the geometric center of the load-bearing frame. The lower end of the vertical linkage push rod is provided with a vertical sliding groove, and the central hinge shaft passes through the vertical sliding groove. When in use, the object being lifted is supported on the rack, and the center of gravity of the object being lifted is vertically aligned with the geometric center of the rack. During the lifting process, the central hinge axis rises and translates. The central hinge axis drives the rack to move synchronously through the vertical linkage push rod, and the center of gravity of the object being lifted is always located above the central hinge axis. This ensures that the scissor lift assembly is always subjected to uniform force, the bracket is not prone to tipping over, and the force is even and not easily damaged.

[0007] Preferably, the first forks of the two scissor lift assemblies are connected together by a hydraulic cylinder support rod. The distance between the hydraulic cylinder support rod and the central hinge pin is less than 20 cm. One end of the hydraulic cylinder is hinged to the hydraulic cylinder support rod, and the other end is hinged to the upper end of one of the first forks. This design ensures that when the hydraulic cylinder is driven, the point of application of the breaking force on the middle of the scissor lift assembly is close to the central hinge pin, thus reducing the likelihood of the forks breaking.

[0008] Preferably, there are two hydraulic cylinders, with their upper ends hinged one-to-one to the upper ends of the telescopic first forks of the two scissor lift assemblies. This results in better stability when lifting the support frame.

[0009] Preferably, the hydraulic cylinder support rod is fixed to the lower side of the second fork, and the first fork is located outside the second fork. The hydraulic cylinder support rod can easily achieve the opening and closing of the two forks without interfering with each other.

[0010] Preferably, the cylinder support rod has two reinforcing plates at both ends, which are fixedly connected to the inner horizontal surfaces of the two second forks. This improves the structural strength.

[0011] Preferably, the main frame has a first slide rail on its lower side, and the upper end of the first fork is rotatably connected to a first roller supported on the lower side of the first slide rail. The base frame has a second slide rail on its upper side, and the lower end of the second fork is rotatably connected to a second roller supported on the upper side of the second slide rail. This ensures smooth sliding during lifting.

[0012] Preferably, the lower surface of the first slide rail is provided with a first groove, and the first roller is supported in the groove; the upper surface of the second slide rail is provided with a second groove, and the second roller is supported in the second groove. This reduces the likelihood of derailment.

[0013] Preferably, the lower ends of the two second forks are connected together by a synchronizing rod. This ensures consistent lifting speeds when the two scissor lift assemblies open and close.

[0014] Preferably, the main frame and the sliding frame are both rectangular frame structures, and the carrying rack is provided with several inspection and maintenance holes. This allows for convenient bottom work on the lifted object from under the bracket, such as working under a car.

[0015] Preferably, the central hinge pins of the two scissor lift assemblies are positioned at opposite ends of the hydraulic cylinder support rod. This compact structure effectively connects the two scissor lift assemblies into a single unit, resulting in good lifting stability.

[0016] Beneficial effects: When supported, the center of gravity of the object being lifted always remains at the geometric center of the support plane of the lifting structure, resulting in good stability. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of Embodiment 1 of this utility model;

[0018] Figure 2 This is the three-dimensional osmotic pressure of Embodiment 2 of this utility model.

[0019] In the diagram: 1. Base frame; 2. Hydraulic cylinder; 3. Scissor lift assembly; 4. Middle hinge shaft; 5. First fork; 6. Second fork; 7. Main frame; 8. Sliding frame; 9. Loading rack; 10. Hydraulic cylinder support rod; 11. Lower hinge block; 12. Upper hinge block; 13. Reinforcing plate; 14. First slide rail; 15. First roller; 16. Second slide rail; 17. Second roller; 18. First slide groove; 19. Second slide groove; 20. Vertical linkage push rod; 21. Vertical slide groove; 22. Synchronous rod connection hole. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1, see Figure 1A hydraulic lifting mechanism for a mechanical linkage adjustment center includes a base frame 1, a hydraulic cylinder 2, a scissor lift assembly 3 connected to the base frame, and a bracket mounted on the upper end of the scissor lift assembly. The hydraulic cylinder extends and retracts to drive the scissor lift assembly, which in turn lifts and lowers the bracket. There are two scissor lift assemblies. Each scissor lift assembly includes a first fork 5 and a second fork 6 hinged together at their center via a central hinge pin 4. The lower end of the first fork 5 is hinged to the base frame, and its upper end is slidably connected to the bracket. The upper end of the second fork 6 is hinged to the bracket, and its lower end is slidably connected to the bracket. The two scissor lift assemblies are distributed along the extension direction of the central hinge pin and supported at both ends of the bracket. The bracket includes a main frame 7 that cooperates with the scissor lift assembly, a sliding frame 8 mounted on the main frame, and a load-bearing frame 9 slidably connected to the sliding frame. The main frame is a rectangular frame structure. The sliding frame is a rectangular frame structure. The load-bearing frame has several maintenance access holes. The second forks of the two scissor lift assemblies are connected together by a hydraulic cylinder support rod 10, and the distance between the hydraulic cylinder support rod and the central hinge pin is less than 20 cm. In this embodiment, the central hinge pins of the two scissor lift assemblies are respectively set at both ends of the hydraulic cylinder support rod. One end of the hydraulic cylinder is hinged to the hydraulic cylinder support rod through a lower hinge block 11, and the other end is hinged to the upper end of a first fork through an upper hinge block 12. There are two hydraulic cylinders, and the upper ends of the two hydraulic cylinders are respectively hinged to the upper ends of the telescopic first forks of the two scissor lift assemblies. The hydraulic cylinder support rod is fixed to the lower side of the second fork, and the first fork is located on the outside of the second fork. Two reinforcing plates 13 are provided at both ends of the hydraulic cylinder support rod, which are respectively fixed to the horizontal inner side of the two second forks. The main frame has a first slide rail 14 on its lower side, and 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. The base frame has a second slide rail 16 on its upper side, 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. A first groove 18 is provided on the lower surface of the first slide rail, and the first roller is supported in the groove. A second groove 19 is provided on the upper surface of the second slide rail, and the second roller is supported in the second groove. The lower ends of the two second forks are connected together by a synchronizing rod (not shown in the figure). The two ends of the synchronizing rod are connected one-to-one to the synchronizing rod connecting holes 22 on the two second forks.

[0022] In use, the hydraulic cylinder extends and retracts to open and close the scissor lift assembly, thereby driving the bracket to lift and lower the object.

[0023] Example 2 differs from Example 1 in that:

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

[0025] When in use, the object being lifted is supported on the rack, and the center of gravity of the object being lifted is vertically aligned with the geometric center of the rack. During the lifting process, the central hinge axis rises and translates. The central hinge axis drives the rack to move synchronously through the vertical linkage push rod, and the center of gravity of the object being lifted is always located above the central hinge axis. This ensures that the scissor lift assembly is always subjected to uniform force, the bracket is not prone to tipping over, and the force is even and not easily damaged.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only 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 said element.

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

Claims

1. A hydraulic lifting mechanism for a mechanical linkage adjustment center, characterized in that, The device includes a base frame, a hydraulic cylinder, a scissor lift assembly connected to the base frame, and a bracket mounted on the upper end of the scissor lift assembly. The hydraulic cylinder extends and retracts to drive the scissor lift assembly to raise and lower the bracket. The scissor lift assembly includes a first fork and a second fork hinged together at their midpoints via a central hinge shaft. The lower end of the first fork is hinged to the base frame, and the upper end of the first fork is slidably connected to the bracket. The upper end of the second fork is hinged to the bracket, and the lower end of the second fork is slidably connected to the bracket. There are two scissor lift assemblies, distributed along the extension direction of the central hinge shaft. The bracket includes a main frame that cooperates with the scissor lift assembly, a sliding frame mounted on the main frame, and a load rack slidably connected to the sliding frame. A vertical linkage push rod is fixed to the lower surface at the geometric center of the load rack. The lower end of the vertical linkage push rod is provided with a vertical sliding groove, and the central hinge shaft passes through the vertical sliding groove.

2. The hydraulic lifting mechanism for a mechanical linkage adjustment center according to claim 1, characterized in that, The second fork in the two scissor lift assemblies is connected together by a hydraulic cylinder support rod. The distance between the hydraulic cylinder support rod and the central hinge pin is less than 20 centimeters. One end of the hydraulic cylinder is hinged to the hydraulic cylinder support rod, and the other end is hinged to the upper end of one of the first forks.

3. The hydraulic lifting mechanism for a mechanical linkage adjustment center according to claim 2, 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 of the two scissor lift assemblies, one to one.

4. The hydraulic lifting mechanism for a mechanical linkage adjustment center according to claim 2 or 3, characterized in that, The hydraulic cylinder support rod is fixed to the lower side of the second fork, and the first fork is located on the outside of the second fork.

5. The hydraulic lifting mechanism for a mechanical linkage adjustment center according to claim 4, characterized in that, The cylinder support rod has two reinforcing plates at both ends, which are fixed to the inner side of the two second forks in the horizontal direction.

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

7. The hydraulic lifting mechanism for a mechanical linkage adjustment center according to claim 6, characterized in that, The lower surface of the first slide rail is provided with a first slide groove, and the first roller is supported in the slide groove. The upper surface of the second slide rail is provided with a second slide groove, and the second roller is supported in the second slide groove.

8. A hydraulic lifting mechanism for a mechanical linkage adjustment center according to claim 1, 2, or 3, characterized in that, The lower ends of the two second forks are connected together by a synchronizing rod.

9. A hydraulic lifting mechanism for a mechanical linkage adjustment center 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 carrying rack is provided with several maintenance access holes.

10. A hydraulic lifting mechanism for a mechanical linkage adjustment center according to claim 2 or 3, characterized in that, The central hinge pins of the two scissor lift assemblies are set at both ends of the hydraulic cylinder support rod in a one-to-one correspondence.

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