Hydraulic lifting frame

Abstract

The utility model provides a hydraulic lifting frame which comprises a bottom frame used for arranging wheels, shear fork assemblies connected with the bottom frame and a chassis arranged at the upper ends of the shear fork assemblies, the shear fork assemblies are provided with hydraulic driving mechanisms, the hydraulic driving mechanisms stretch out and draw back to drive the shear fork assemblies to drive the chassis to ascend and descend, and two shear fork assemblies arranged at intervals are arranged on the bottom frame. The two shear fork assemblies are connected with a mounting rod in a bridging mode, two hydraulic driving mechanisms are arranged on the mounting rod to drive the two shear fork assemblies respectively, the mounting rod is arranged close to hinge points of the shear fork assemblies, one end of each hydraulic driving mechanism is arranged on the mounting rod, the other end of each hydraulic driving mechanism is arranged at one end of the corresponding shear fork assembly, and a working face with the position adjustable is arranged on the chassis. The hydraulic lift truck has the advantages that the supporting strength of the hydraulic lift truck is improved, the service life of the hydraulic lift truck is prolonged, the position of the working face can be adjusted, and the anti-roll capacity of the hydraulic lift truck is improved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic lifting vehicle technology, and in particular to a hydraulic lifting vehicle frame. 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] In order to overcome the above-mentioned shortcomings in the prior art, this utility model provides a hydraulic lifting vehicle frame, which improves the support strength of the hydraulic lifting vehicle, extends the service life of the hydraulic lifting vehicle, and can adjust the position of the working surface to improve the anti-tilt capability of the hydraulic lifting vehicle.

[0006] To achieve the above objectives, the present invention adopts the following technical solution.

[0007] A hydraulic lifting frame includes a base frame for mounting wheels, a scissor lift assembly connected to the base frame, and a platform mounted on the upper end of the scissor lift assembly. The scissor lift assembly is equipped with a hydraulic drive mechanism that extends and retracts to drive the scissor lift assembly to raise and lower the platform. The base frame has two sets of scissor lift assemblies spaced apart, with a mounting rod bridging the two sets of scissor lift assemblies. The mounting rod has two sets of hydraulic drive mechanisms to drive the two sets of scissor lift assemblies respectively. The mounting rod is located near the hinge point of the scissor lift assembly. One end of the hydraulic drive mechanism is mounted on the mounting rod, and the other end is mounted on one end of the scissor lift assembly. The platform has an adjustable working surface.

[0008] In this application, a mounting rod is connected between the two sets of scissor lift assemblies. The mounting rod improves the overall integrity and motion synchronization of the two sets of scissor lift assemblies, and also strengthens the structure of the scissor lift assemblies. Furthermore, the close proximity of the hinge point between the mounting rod and the scissor lift assembly ensures that the force exerted by the mounting rod on the scissor lift assembly is distributed across the entire assembly, rather than on a single member, thus preventing member deformation and extending the lifespan of the scissor lift assembly. The working surface position of this application is adjustable. One end of the scissor lift assembly remains fixed in position with the base frame, while the other end slides. When the scissor lift assembly drives the platform to rise or fall, the support position of the scissor lift assembly changes. The adjustable working surface coordinates with this change in the support position of the scissor lift assembly, effectively improving the anti-tilt capability of the hydraulic lifting vehicle.

[0009] Preferably, the scissor lift assembly includes a first fork and a second fork hinged at the center. The first fork is located outside the second fork, with its lower end hinged to the chassis and its upper end slidably connected to the platform. The upper end of the second fork is hinged to the platform, and its lower end is slidably connected to the platform. A mounting rod is fixedly connected to the first fork. When the first and second forks rotate relative to each other, the height of their upper ends changes, thereby raising and lowering the platform.

[0010] Preferably, one end of the hydraulic drive mechanism is provided with a hinge block, which is fixedly connected to the upper end of the first fork, and the mounting rod is connected to the lower side of the first fork. The hinge block is connected to the end of the first fork, making the end of the fork less prone to deformation under stress, thus further ensuring the service life of the first fork.

[0011] Preferably, a displacement monitoring sensor is installed between the scissor lift and the articulation block. This sensor allows for the quantitative and automatic monitoring of the lateral displacement of the scissor lift assembly, facilitating automatic adjustment of the working face position.

[0012] Preferably, the underside of the chassis is provided with a first slide rail that slides with the upper end of the first fork, and a first roller is rotatably mounted on the upper end of the first fork. The upper side of the chassis is provided with a second slide rail that slides with the lower end of the second fork, and a second roller is rotatably mounted on the lower end of the second fork. The first and second rollers reduce friction at one end of the scissor fork assembly during lateral sliding.

[0013] Preferably, the pallet includes a pallet frame that mates with the scissor lift assembly. A sliding frame is located at the center of the pallet frame, and a working surface that slides along the sliding frame is mounted on the sliding frame. A linear drive mechanism that drives the working surface to slide is also mounted on the sliding frame. The sliding arrangement of the sliding frame and the working surface allows for position adjustment of the working surface relative to the pallet frame, and the linear drive mechanism enables the working surface to slide automatically, making control convenient and reliable.

[0014] Preferably, the linear drive mechanism includes a drive motor and a lead screw and nut assembly. The lead screw and nut assembly includes a transmission lead screw and a sliding nut. The drive motor drives the transmission lead screw to rotate, thereby causing the sliding nut to slide. The working surface is provided with a mounting plate that is fixedly connected to the sliding nut. When the drive motor drives the transmission lead screw to rotate, it can cause the sliding nut to slide. The sliding distance of the sliding nut can be automatically controlled by the number of rotations of the drive motor. The drive motor can be a servo motor to ensure the adjustment accuracy of the working surface.

[0015] A method for adjusting the center of gravity of the aforementioned hydraulic lifting vehicle frame involves a linear drive mechanism driving the working surface to slide L / 2 in the same direction as the hinge block when the sliding displacement of the hinge block is L. When the working surface is at its lowest position relative to the base frame, it is located in the middle of the platform. This method ensures that the center of gravity of the working surface remains at the hinge position of the scissor lift assembly, providing reliable support and improving the anti-tilt capability of the hydraulic lifting vehicle. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of this utility model from one angle.

[0017] Figure 2 This is a structural schematic diagram of the present invention from another angle.

[0018] Figure 3 This is a schematic diagram of the structure of the scissor lift assembly and other parts in this utility model.

[0019] Figure 4 yes Figure 1 Side view.

[0020] In the figure: base frame 1, scissor lift assembly 2, first fork 201, second fork 202, hinge block 203, second hinge block 204, first slide rail 205, first roller 206, second slide rail 207, second roller 208;

[0021] 3. Wheel base; 31. Working surface; 32. Wheel base frame; 33. Sliding frame; 34. Thrust wheel;

[0022] Hydraulic drive mechanism 4, mounting rod 41, reinforcing plate 42;

[0023] Linear drive mechanism 5, drive motor 51;

[0024] Displacement monitoring sensor 6. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] One embodiment of this utility model discloses a hydraulic lifting frame, such as Figures 1 to 4As shown, the device includes a base frame 1 for mounting wheels, a scissor lift assembly 2 connected to the base frame 1, and a pallet 3 mounted on the upper end of the scissor lift assembly 2. The scissor lift assembly 2 is equipped with a hydraulic drive mechanism 4, which extends and retracts to drive the scissor lift assembly 2 to raise and lower the pallet 3. The base frame 1 has two sets of scissor lift assemblies 2 spaced apart, and the two sets of scissor lift assemblies 2 are connected by a mounting rod 41. The mounting rod 41 has two sets of hydraulic drive mechanisms 4 to drive the two sets of scissor lift assemblies 2 respectively. The mounting rod 41 is located near the hinge point of the scissor lift assembly 2. One end of the hydraulic drive mechanism 4 is mounted on the mounting rod 41, and the other end is mounted on one end of the scissor lift assembly 2. The pallet 3 has an adjustable working surface 31.

[0027] In this application, a mounting rod 41 is connected between the two sets of scissor lift assemblies 2. The mounting rod 41 improves the overall integrity and motion synchronization of the two sets of scissor lift assemblies 2, and also strengthens the structure of the scissor lift assemblies 2. Furthermore, the mounting rod 41 is close to the hinge point of the scissor lift assemblies 2, so that the force exerted by the mounting rod 41 on the scissor lift assemblies 2 is distributed over the entire scissor lift assemblies 2, rather than being applied to a single rod, thus preventing rod deformation and extending the lifespan of the scissor lift assemblies 2. For example, in this embodiment, the mounting rod 41 is positioned directly below the hinge point of the scissor lift assemblies 2, so that when the mounting rod 41 is subjected to force, it can simultaneously transmit the force to both the rods and the hinge point of the scissor lift assemblies 2.

[0028] The working surface 31 of this application is adjustable. One end of the scissor lift assembly 2 remains fixed in position with the base frame 1, while the other end slides. When the scissor lift assembly 2 drives the platform 3 to rise or fall, the support position of the scissor lift assembly 2 changes. The adjustable working surface 31 is used to coordinate with the change in the support position of the scissor lift assembly 2, effectively improving the anti-tilt capability of the hydraulic lifting vehicle. The position adjustment of the working surface 31 is coordinated with the lateral position adjustment of the scissor lift assembly 2. The hydraulic drive mechanism 4 uses a hydraulic cylinder.

[0029] The four ends of the base frame 1 can be used to install wheels, that is, the four wheels support the hydraulic lifting frame and realize the movement of the hydraulic lifting frame. The wheels can be set as omnidirectional wheels to facilitate the steering adjustment of the hydraulic lifting frame.

[0030] As one embodiment of this utility model, a hydraulic lifting frame is disclosed, such as Figures 1 to 4As shown, the device includes a base frame 1 for mounting wheels, a scissor lift assembly 2 connected to the base frame 1, and a pallet 3 mounted on the upper end of the scissor lift assembly 2. The scissor lift assembly 2 is equipped with a hydraulic drive mechanism 4, which extends and retracts to drive the scissor lift assembly 2 to raise and lower the pallet 3. The base frame 1 has two sets of scissor lift assemblies 2 spaced apart, and the two sets of scissor lift assemblies 2 are connected by a mounting rod 41. The mounting rod 41 has two sets of hydraulic drive mechanisms 4 to drive the two sets of scissor lift assemblies 2 respectively. The mounting rod 41 is located near the hinge point of the scissor lift assembly 2. One end of the hydraulic drive mechanism 4 is mounted on the mounting rod 41, and the other end is mounted on one end of the scissor lift assembly 2. The pallet 3 has an adjustable working surface 31.

[0031] The scissor lift assembly 2 includes a first fork 201 and a second fork 202 hinged in the middle. The first fork 201 is located outside the second fork 202. The lower end of the first fork 201 is hinged to the chassis, and the upper end of the first fork 201 is slidably connected to the chassis 3. The upper end of the second fork 202 is hinged to the chassis 3, and the lower end of the second fork 202 is slidably connected to the chassis 3. A mounting rod 41 is fixedly connected to the first fork 201. One end of the hydraulic drive mechanism is provided with a hinge block 203, which is fixedly connected to the upper end of the first fork 201. The mounting rod 41 is connected to the lower side of the first fork 201. A reinforcing plate 42 is provided on the mounting rod 41 to abut against the side of the first fork 201. The hinge block 203 is connected to the end of the first fork 201, making the end of the rod less prone to deformation under stress, thus further ensuring the service life of the first fork 201. Both the first fork 201 and the second fork 202 are straight rod structures, and the lengths of the first fork 201 and the second fork 202 are equal. The middle parts of the first fork 201 and the second fork 202 are hinged together by a hinge axis.

[0032] Furthermore, a second hinge block 204 is fixedly provided on the mounting rod 41, extending out of the mounting rod 41. The second hinge block 204 is rotatably connected to the lower end of the hydraulic drive mechanism 4, so that the hydraulic drive mechanism 4, the second hinge block 204, and the first hinge block 203 are in the shape of a linkage structure, so that the hydraulic drive mechanism 4 has a certain adjustment margin, and when the lengths of the two sets of hydraulic drive mechanisms 4 are slightly different, the lifting height of the two sets of scissor assemblies 2 will not be too different, thus avoiding jamming of the scissor assemblies 2.

[0033] The underside of the chassis 3 is provided with a first slide rail 205 that slides with the upper end of the first fork 201. A first roller 206 is rotatably mounted on the upper end of the first fork 201, and the first roller 206 rolls within the first slide rail 205. The upper side of the chassis is provided with a second slide rail 207 that slides with the lower end of the second fork 202. A second roller 208 is rotatably mounted on the lower end of the second fork 202, and the second roller 208 rolls within the second slide rail 207. The first roller 206 and the second roller 208 reduce friction at one end of the scissor fork assembly 2 during lateral sliding.

[0034] As one embodiment of this utility model, a hydraulic lifting frame is disclosed, such as Figures 1 to 4 As shown, the device includes a base frame 1 for mounting wheels, a scissor lift assembly 2 connected to the base frame 1, and a pallet 3 mounted on the upper end of the scissor lift assembly 2. The scissor lift assembly 2 is equipped with a hydraulic drive mechanism 4, which extends and retracts to drive the scissor lift assembly 2 to raise and lower the pallet 3. The base frame 1 has two sets of scissor lift assemblies 2 spaced apart, and the two sets of scissor lift assemblies 2 are connected by a mounting rod 41. The mounting rod 41 has two sets of hydraulic drive mechanisms 4 to drive the two sets of scissor lift assemblies 2 respectively. The mounting rod 41 is located near the hinge point of the scissor lift assembly 2. One end of the hydraulic drive mechanism 4 is mounted on the mounting rod 41, and the other end is mounted on one end of the scissor lift assembly 2. The pallet 3 has an adjustable working surface 31. The pallet 3 includes a pallet frame 32 that cooperates with the scissor lift assembly 2. A sliding frame 33 is provided at the middle of the pallet frame 32. The pallet frame 32 and the sliding frame 33 are fixedly installed. A working surface 31 that slides along the sliding frame 33 is mounted on the sliding frame 33. The sliding frame 33 provides a sliding guide for the working surface 31 along the first slide rail 205. A linear drive mechanism 5 is provided on the sliding frame 33 to drive the working surface 31 to slide. The sliding arrangement of the sliding frame 33 and the working surface 31 realizes the position adjustment of the working surface 31 relative to the pallet frame 32. The linear drive mechanism 5 can drive the working surface 31 to slide automatically, which is convenient and reliable. The linear drive mechanism 5 includes a drive motor 51 and a lead screw and nut assembly. The lead screw and nut assembly includes a transmission lead screw and a sliding nut. The drive motor 51 drives the transmission lead screw to rotate so as to drive the sliding nut to slide. The working surface 31 is provided with a mounting plate that is fixedly connected to the sliding nut. When the drive motor 51 drives the transmission screw to rotate, it can cause the sliding nut to slide. The sliding distance of the sliding nut can be automatically controlled by the number of rotations of the drive motor 51. The drive motor 51 can be a servo motor to ensure the adjustment accuracy of the working surface 31. The outer end of the sliding frame 33 is provided with two spaced-apart stop wheels 34. The stop wheels 34 are rotatably set, and their axes are vertical. The stop wheels 34 have the function of limiting the working surface 31 and the items on the working surface 31.

[0035] As a simple replacement for the above solution, the linear drive mechanism 5 can be an electric cylinder, hydraulic cylinder, etc.

[0036] In this embodiment, a displacement monitoring sensor 6 is provided between the scissor lift assembly 203 and the hinge block 203. The displacement monitoring sensor 6 can automatically monitor the lateral displacement of the scissor lift assembly 2. Based on the output data of the displacement monitoring sensor 6, a control signal can be given through the control circuit to realize the automatic adjustment of the position of the working surface 31.

[0037] As one embodiment of this utility model, a method for adjusting the center of gravity of the aforementioned hydraulic lifting frame is proposed. When the sliding displacement of the hinge block 203 is L, the linear drive mechanism 5 drives the working surface 31 to slide L / 2 in the same direction as the sliding direction of the hinge block 203. When the working surface 31 is at its lowest position relative to the base frame 1, the working surface 31 is located in the middle position of the platform 3. This method of adjusting the center of gravity enables the center of gravity of the working surface 31 to be kept at the hinge position of the scissor assembly 2, so that the scissor assembly 2 provides reliable support and improves the anti-tilt capability of the hydraulic lifting vehicle.

Claims

1. A hydraulic lifting frame, characterized in that, The device includes a base frame for mounting wheels, a scissor lift assembly connected to the base frame, and a platform mounted on top of the scissor lift assembly. The scissor lift assembly is equipped with a hydraulic drive mechanism that extends and retracts to drive the scissor lift assembly to raise and lower the platform. The base frame has two sets of scissor lift assemblies spaced apart, with a mounting rod bridging the two sets of scissor lift assemblies. The mounting rod has two sets of hydraulic drive mechanisms to drive the two sets of scissor lift assemblies respectively. The mounting rod is located near the hinge point of the scissor lift assembly. One end of the hydraulic drive mechanism is mounted on the mounting rod, and the other end is mounted on one end of the scissor lift assembly. The platform has an adjustable working surface.

2. The hydraulic lifting frame according to claim 1, characterized in that, The scissor lift assembly includes a first fork and a second fork hinged in the middle. The first fork is located outside the second fork. The lower end of the first fork is hinged to the chassis, and the upper end of the first fork is slidably connected to the chassis. The upper end of the second fork is hinged to the chassis, and the lower end of the second fork is slidably connected to the chassis. A mounting rod is fixedly connected to the first fork.

3. A hydraulic lifting frame according to claim 2, characterized in that, One end of the hydraulic drive mechanism is provided with a hinge block, which is fixedly connected to the upper end of the first fork, and the mounting rod is connected to the lower side of the first fork.

4. A hydraulic lifting frame according to claim 3, characterized in that, A displacement monitoring sensor is provided between the chassis and the articulated block.

5. A hydraulic lifting frame according to claim 2, 3, or 4, characterized in that, The chassis has a first slide rail on its underside that slides with the upper end of the first fork, and a first roller is rotatably mounted on the upper end of the first fork. The chassis has a second slide rail on its upper side that slides with the lower end of the second fork, and a second roller is rotatably mounted on the lower end of the second fork.

6. A hydraulic lifting frame according to claim 1, characterized in that, The scissor lift includes a scissor lift frame that cooperates with the scissor lift assembly. A sliding frame is provided in the middle of the scissor lift frame, and a working surface that slides along the sliding frame is provided on the sliding frame. A linear drive mechanism that drives the working surface to slide is provided on the sliding frame.

7. A hydraulic lifting frame according to claim 6, characterized in that, The linear drive mechanism includes a drive motor and a lead screw and nut assembly. The lead screw and nut assembly includes a transmission lead screw and a sliding nut. The drive motor drives the transmission lead screw to rotate so as to drive the sliding nut to slide. The working surface is provided with a mounting plate that is fixedly connected to the sliding nut.

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