Hydraulic lifting frame and gravity center adjusting method thereof

Abstract

The invention provides a hydraulic lifting frame and a gravity center adjusting method thereof.The hydraulic lifting frame comprises a bottom frame used for arranging wheels, a shear fork assembly connected with the bottom frame and a chassis arranged at the upper end of the shear fork assembly, the shear fork assembly is provided with a hydraulic driving mechanism, and the hydraulic driving mechanism stretches out and draws back to drive the shear fork assembly to drive the chassis to ascend and descend; two shear fork assemblies are arranged on the bottom frame in a spaced mode and 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, and the other end of each hydraulic driving mechanism is arranged at one end of the corresponding shear fork assembly. And a working surface with an adjustable position is arranged on the undercarriage. 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] The invention relates to the technical field of hydraulic lifting vehicles, and in particular to a hydraulic lifting vehicle frame and a method for adjusting the center of gravity thereof. 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] In order to overcome the above-mentioned deficiencies in the prior art, the present invention provides a hydraulic lift frame and a method for adjusting the center of gravity thereof, thereby improving the supporting strength of the hydraulic lift, extending the service life of the hydraulic lift, and being able to adjust the position of the working surface to improve the anti-rollover capability of the hydraulic lift.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions.

[0007] A hydraulic lifting frame comprises a base frame for setting wheels, a scissor assembly connected to the base frame and a vehicle disc set at the upper end of the scissor assembly, the scissor assembly is equipped with a hydraulic drive mechanism, the hydraulic drive mechanism is telescopic to drive the scissor assembly to drive the vehicle disc to rise and fall, two groups of scissor assemblies arranged at intervals are arranged on the base frame, the two groups of scissor assemblies are bridged by a mounting rod, two groups of hydraulic drive mechanisms are arranged on the mounting rod to drive the two groups of scissor assemblies respectively, the mounting rod is arranged near the hinge point of the scissor assembly, one end of the hydraulic drive mechanism is arranged on the mounting rod, and the other end is arranged at one end of the scissor assembly, and a working surface with adjustable position is provided on the vehicle disc.

[0008] In the present application, a mounting rod is connected across the two groups of scissor assemblies. The mounting rod can improve the integrity and movement synchronization of the two groups of scissor assemblies, and the mounting rod has a structural reinforcement effect on the scissor assemblies. On this basis, the mounting rod and the hinge point of the scissor assembly are close to each other, so that the force of the mounting rod on the scissor assembly is distributed on the entire scissor assembly, rather than a single rod being subjected to force, which can avoid deformation of the rod and extend the life of the scissor assembly. The working surface position of the present application is adjustable, one lateral end of the scissor assembly remains unchanged with the base frame, and the other end slides. When the scissor assembly drives the vehicle disc to rise and fall, the support position of the scissor assembly changes. The adjustable working surface is used to match the change in the support position of the scissor assembly, effectively improving the anti-rollover ability of the hydraulic lift truck.

[0009] Preferably, the scissor assembly includes a first fork rod and a second fork rod hinged in the middle, the first fork rod is located outside the second fork rod, the lower end of the first fork rod is hinged to the chassis, the upper end of the first fork rod is slidably connected to the wheel disc, the upper end of the second fork rod is hinged to the wheel disc, the lower end of the second fork rod is slidably connected to the wheel disc, and the mounting rod is fixedly connected to the first fork rod. When the first fork rod and the second fork rod rotate relative to each other, the height of the upper ends of the two will change, thereby playing a role in lifting and lowering the wheel disc.

[0010] Preferably, a hinge block is provided at one end of the hydraulic drive assembly, the hinge block is fixedly connected to the upper end of the first fork rod, and the mounting rod is connected to the lower side of the first fork rod. The hinge block is connected to the end of the first fork rod, and the end of the rod is not easily deformed by force, which can further ensure the service life of the first fork rod.

[0011] Preferably, a displacement monitoring sensor is provided between the wheel base and the hinge block, so as to quantitatively and automatically monitor the lateral displacement of the scissor assembly, thereby facilitating automatic adjustment of the working surface position.

[0012] Preferably, a first slide rail is provided on the lower side of the vehicle disc to cooperate with the upper end of the first fork rod for sliding, a first roller is provided on the upper end of the first fork rod for rotation, a second slide rail is provided on the upper side of the chassis to cooperate with the lower end of the second fork rod for sliding, a second roller is provided on the lower end of the second fork rod for rotation. The friction of one end of the scissor assembly when sliding horizontally is reduced by the first roller and the second roller.

[0013] Preferably, the vehicle disc includes a vehicle disc frame that cooperates with the scissor assembly, a sliding frame is provided in the middle of the vehicle disc frame, a working surface that slides along the sliding frame is mounted on the sliding frame, and a linear driving mechanism that drives the working surface to slide is provided on the sliding frame. The sliding arrangement of the sliding frame and the working surface enables the position adjustment of the working surface relative to the vehicle disc frame, and the linear driving mechanism can drive the working surface to slide automatically, and the control is convenient and reliable.

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

[0015] A method for adjusting the center of gravity of the above-mentioned hydraulic lifting vehicle frame, when the sliding displacement of the hinge block is L, the linear drive mechanism drives the working surface to slide L / 2 in the same direction of the hinge block sliding direction. When the working surface is at the lowest position relative to the base frame, the working surface is located in the middle position of the vehicle plate. The center of gravity adjustment method can keep the center of gravity of the working surface at the hinge position of the scissor assembly, so that the scissor assembly provides reliable support and improves the anti-rollover ability of the hydraulic lifting vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention from one angle.

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

[0018] Figure 3 It is a schematic diagram of the structure of the scissor lift assembly and other parts in the present invention.

[0019] Figure 4 yes Figure 1 Side view of.

[0020] In the figure: base frame 1, scissor assembly 2, first fork rod 201, second fork rod 202, hinge block 203, second hinge block 204, first slide rail 205, first roller 206, second slide rail 207, second roller 208; The undercarriage 3, the working surface 31, the undercarriage frame 32, the sliding frame 33, and the blocking wheel 34; Hydraulic drive mechanism 4, mounting rod 41, reinforcement plate 42; Linear drive mechanism 5, drive motor 51; Displacement monitoring sensor 6. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] One embodiment of the present invention discloses a hydraulic lifting frame, such as Figures 1 to 4As shown, it includes a base frame 1 for setting wheels, a scissor assembly 2 connected to the base frame 1 and a wheel plate 3 arranged at the upper end of the scissor assembly 2, the scissor assembly 2 is equipped with a hydraulic drive mechanism 4, the hydraulic drive mechanism 4 is telescopic to drive the scissor assembly 2 to drive the wheel plate 3 to rise and fall, two groups of scissor assemblies 2 arranged at intervals are provided on the base frame 1, the two groups of scissor assemblies 2 are bridged by a mounting rod 41, two groups of hydraulic drive mechanisms 4 are provided on the mounting rod 41 to drive the two groups of scissor assemblies 2 respectively, the mounting rod 41 is arranged close to the hinge point of the scissor assembly 2, one end of the hydraulic drive mechanism 4 is arranged on the mounting rod 41, and the other end is arranged at one end of the scissor assembly 2, and the wheel plate 3 is provided with a working surface 31 with an adjustable position.

[0023] In the present application, a mounting rod 41 is connected across the two groups of scissor assembly 2, and the mounting rod 41 can improve the integrity and movement synchronization of the two groups of scissor assembly 2, and the mounting rod 41 has a structural reinforcement effect on the scissor assembly 2. On this basis, the mounting rod 41 is close to the hinge point position of the scissor assembly 2, so that the force of the mounting rod 41 on the scissor assembly 2 is distributed on the whole scissor assembly 2, rather than a single rod being stressed, which can avoid deformation of the rod and extend the life of the scissor assembly 2. Exemplarily, in the present embodiment, the mounting rod 41 is arranged directly below the hinge point of the scissor assembly 2, and when the mounting rod 41 is subjected to force, it can be transmitted to the rod and the hinge point position of the scissor assembly 2 at the same time.

[0024] The position of the working surface 31 of the present application is adjustable. One lateral end of the scissor assembly 2 remains unchanged with the base frame 1, while the other end slides. When the scissor assembly 2 drives the vehicle plate 3 to rise or fall, the supporting position of the scissor assembly 2 changes. The adjustable working surface 31 is used to match the change in the supporting position of the scissor assembly 2, thereby effectively improving the anti-rollover capability of the hydraulic lift vehicle. The position adjustment of the working surface 31 is coordinated with the lateral position of the scissor assembly 2. The hydraulic drive mechanism 4 uses a hydraulic cylinder.

[0025] The four ends of the base frame 1 can be used to set wheels, that is, the four wheels support the hydraulic lifting frame to realize the movement of the hydraulic lifting frame. The wheels can be set as universal wheels to facilitate the steering adjustment of the hydraulic lifting frame.

[0026] As one of the embodiments of the present invention, a hydraulic lifting frame is disclosed, such as Figures 1 to 4As shown, it includes a base frame 1 for setting wheels, a scissor assembly 2 connected to the base frame 1 and a wheel plate 3 arranged at the upper end of the scissor assembly 2, the scissor assembly 2 is equipped with a hydraulic drive mechanism 4, the hydraulic drive mechanism 4 is telescopic to drive the scissor assembly 2 to drive the wheel plate 3 to rise and fall, two groups of scissor assemblies 2 arranged at intervals are provided on the base frame 1, the two groups of scissor assemblies 2 are bridged by a mounting rod 41, two groups of hydraulic drive mechanisms 4 are provided on the mounting rod 41 to drive the two groups of scissor assemblies 2 respectively, the mounting rod 41 is arranged close to the hinge point of the scissor assembly 2, one end of the hydraulic drive mechanism 4 is arranged on the mounting rod 41, and the other end is arranged at one end of the scissor assembly 2, and the wheel plate 3 is provided with a working surface 31 with an adjustable position.

[0027] The scissor assembly 2 includes a first fork rod 201 and a second fork rod 202 which are hinged in the middle. The first fork rod 201 is located outside the second fork rod 202. The lower end of the first fork rod 201 is hinged to the chassis. The upper end of the first fork rod 201 is slidably connected to the wheel disc 3. The upper end of the second fork rod 202 is hinged to the wheel disc 3. The lower end of the second fork rod 202 is slidably connected to the wheel disc 3. The mounting rod 41 is fixedly connected to the first fork rod 201. A hinge block 203 is provided at one end of the hydraulic drive assembly. The hinge block 203 is fixedly connected to the upper end of the first fork rod 201. The mounting rod 41 is connected to the lower side of the first fork rod 201. A reinforcing plate 42 is provided on the mounting rod 41 to abut against the side of the first fork rod 201. The hinge block 203 is connected to the end of the first fork rod 201. The end of the rod is not easily deformed by force, which can further ensure the service life of the first fork rod 201. The first fork rod 201 and the second fork rod 202 are both straight rod structures, and the lengths of the first fork rod 201 and the second fork rod 202 are equal. The middle parts of the first fork rod 201 and the second fork rod 202 are hinged through a hinge shaft.

[0028] Furthermore, a second hinge block 204 extending to the outside of the mounting rod 41 is fixedly provided on the mounting rod 41, and 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 shaped like a connecting rod structure, so that the hydraulic drive mechanism 4 has a certain adjustment margin, and when the lengths of the two groups of hydraulic drive mechanisms 4 are slightly different, it will not cause excessive difference in the lifting heights of the two groups of scissors fork assemblies 2, thereby avoiding the scissors fork assemblies 2 from getting stuck.

[0029] A first slide rail 205 is provided on the lower side of the vehicle plate 3 to slide with the upper end of the first fork rod 201, and a first roller 206 is rotatably provided on the upper end of the first fork rod 201, and the first roller 206 rolls in the first slide rail 205. A second slide rail 207 is provided on the upper side of the chassis to slide with the lower end of the second fork rod 202, and a second roller 208 is rotatably provided on the lower end of the second fork rod 202. The second roller 208 rolls in the second slide rail 207. The friction of one end of the scissor assembly 2 when sliding horizontally is reduced by the first roller 206 and the second roller 208.

[0030] As one of the embodiments of the present invention, a hydraulic lifting frame is disclosed, such as Figures 1 to 4 As shown, it includes a base frame 1 for setting wheels, a scissor assembly 2 connected to the base frame 1 and a wheel plate 3 arranged at the upper end of the scissor assembly 2, the scissor assembly 2 is equipped with a hydraulic drive mechanism 4, the hydraulic drive mechanism 4 is telescopic to drive the scissor assembly 2 to drive the wheel plate 3 to rise and fall, two groups of scissor assemblies 2 arranged at intervals are provided on the base frame 1, the two groups of scissor assemblies 2 are bridged by a mounting rod 41, two groups of hydraulic drive mechanisms 4 are provided on the mounting rod 41 to drive the two groups of scissor assemblies 2 respectively, the mounting rod 41 is arranged close to the hinge point of the scissor assembly 2, one end of the hydraulic drive mechanism 4 is arranged on the mounting rod 41, and the other end is arranged at one end of the scissor assembly 2, and the wheel plate 3 is provided with a working surface 31 with an adjustable position. The wheel disc 3 includes a wheel disc frame 32 that cooperates with the scissor assembly 2. A sliding frame 33 is provided in the middle of the wheel disc frame 32. The wheel disc frame 32 and the sliding frame 33 are fixedly arranged. 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 that is arranged along the first slide rail 205. A linear drive mechanism 5 that drives the working surface 31 to slide is provided on the sliding frame 33. 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 wheel disc frame 32. The linear drive mechanism 5 can drive the working surface 31 to slide automatically, and the control is convenient and reliable. The linear drive mechanism 5 includes a driving motor 51 and a screw nut assembly. The screw nut assembly includes a transmission screw and a sliding nut. The driving motor 51 drives the transmission screw to rotate 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 driving motor 51 drives the transmission screw to rotate, it can drive the sliding nut to slide. The sliding distance of the sliding nut can be automatically controlled by the number of rotations of the driving motor 51. The driving motor 51 can be a servo motor to ensure the adjustment accuracy of the working surface 31. Two stop wheels 34 are arranged at intervals at the end of the outer end of the sliding frame 33. The stop wheels 34 are rotatably arranged, and the axis of the stop wheels 34 is vertical. The stop wheels 34 have the function of limiting the working surface 31 and the objects on the working surface 31.

[0031] As a simple replacement for the above solution, the linear drive mechanism 5 is an electric cylinder, a hydraulic cylinder, etc.

[0032] In this embodiment, a displacement monitoring sensor 6 is provided between the wheel base 3 and the articulated block 203. The displacement monitoring sensor 6 can automatically monitor the lateral displacement of the scissor assembly 2, and according to the output data of the displacement monitoring sensor 6, a control signal can be given through the control circuit to realize automatic adjustment of the position of the working surface 31.

[0033] As one of the embodiments of the present invention, a method for adjusting the center of gravity of the above-mentioned hydraulic lifting vehicle 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 of the sliding direction of the hinge block 203. When the height of the working surface 31 is at the lowest position relative to the base frame 1, the working surface 31 is located in the middle position of the vehicle plate 3. The center of gravity adjustment method can keep the center of gravity of the working surface 31 at the hinge position of the scissor assembly 2, so that the scissor assembly 2 provides reliable support and improves the anti-rollover ability of the hydraulic lifting vehicle.

Claims

1. A hydraulic lifting frame, characterized in that: It includes an underframe for setting wheels, a scissor assembly connected to the underframe and a disc set at the upper end of the scissor assembly. The scissor assembly is equipped with a hydraulic drive mechanism. The hydraulic drive mechanism is retracted to drive the scissor assembly to drive the disc to rise and fall. Two groups of scissor assemblies are arranged at intervals on the underframe. The two groups of scissor assemblies are bridged by a mounting rod. Two groups of hydraulic drive mechanisms are arranged on the mounting rod to drive the two groups of scissor assemblies respectively. The mounting rod is arranged close to the hinge point of the scissor assembly. One end of the hydraulic drive mechanism is arranged on the mounting rod, and the other end is arranged at one end of the scissor assembly. A working surface with adjustable position is provided on the disc.

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

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

4. A hydraulic lifting frame according to claim 3, characterized in that: A displacement monitoring sensor is provided between the wheel base and the hinge block.

5. A hydraulic lifting frame according to claim 2, 3 or 4, characterized in that: The lower side of the vehicle disc is provided with a first slide rail cooperating with the upper end of the first fork rod for sliding, the upper end of the first fork rod is rotatably provided with a first roller, the upper side of the chassis is provided with a second slide rail cooperating with the lower end of the second fork rod for sliding, the lower end of the second fork rod is rotatably provided with a second roller.

6. The hydraulic lifting frame according to claim 1, characterized in that: The undercarriage comprises an undercarriage frame matched with the scissor fork assembly, a sliding frame is arranged in the middle of the undercarriage frame, a working surface sliding along the sliding frame is arranged on the sliding frame, and a linear driving mechanism driving the working surface to slide is arranged 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 screw-nut assembly, the screw-nut assembly includes a transmission screw and a sliding nut, the drive motor drives the transmission screw to rotate to drive the sliding nut to slide, and the working surface is provided with a mounting plate fixedly connected to the sliding nut.

8. A method for adjusting the center of gravity of a hydraulic lifting frame according to any one of claims 1 to 7, characterized in that: When the sliding displacement of the articulated block is L, the linear drive mechanism drives the working surface to slide L / 2 in the same direction as the sliding direction of the articulated block.

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