A hydraulic lifting system for a lifting device

Abstract

The utility model provides a kind of hydraulic lifting system for lifting device, including hydraulic control module, first oil cylinder group, second oil cylinder group;The first oil cylinder group includes at least two oil cylinders, and the second oil cylinder group includes at least four oil cylinders;The first oil cylinder group and second oil cylinder group are connected by pipeline;The first oil cylinder group includes mechanical leveling structure, and the mechanical leveling structure is used to control the piston rod of each oil cylinder in first oil cylinder group simultaneously telescopic movement;The lifting device includes at least two support structures.The hydraulic lifting system for lifting device provided by the utility model is simple to operate, and the lifting platform is stable in automatic leveling performance, stable in pressure after the first oil cylinder group and second oil cylinder group are filled with hydraulic oil, and the lifting platform can automatically adjust balance when lifting and lowering operation, which solves the technical problem of unbalanced load of lifting platform due to the center of gravity of vehicles or heavy objects on the lifting platform deviating from the center point.

Description

Technical Field

[0001] This utility model relates to the field of lifting technology for large vehicles, and more particularly to lifting devices for large vehicles, especially to a hydraulic lifting and leveling system for lifting devices for large vehicles. Background Technology

[0002] With the rapid development of my country's automobile industry and the surge in car sales, the auto repair industry has also experienced significant growth. Car lifts, as indispensable machinery in auto repair operations, play a crucial role in vehicle maintenance and repair, leading to a substantial increase in demand. A car lift is an ideal device for raising a vehicle for maintenance and upkeep. Car lifts can be categorized by function and shape into three main types: two-post, four-post, and scissor lifts. Based on function, they can be divided into four-wheel alignment type and flatbed type. According to the space occupied, they can be divided into above-ground and underground types. Based on their working principle, they can be divided into hydraulic and mechanical types. Car lifts typically use a hydraulic system to drive the lifting process; they are also called hydraulic lifts. Existing hydraulic lifts primarily use a hydraulic system to provide the lifting power, and during the lifting process, a pallet is used to lift the device to be lifted.

[0003] However, this lifting method can only perform a single lift. It becomes ineffective for subsequent maintenance when differentiated lifting is needed. Furthermore, existing lifting devices, in order to ensure balance, often only allow for uniform lifting, not differentiated lifting. This method presents many inconveniences in practical applications. Moreover, lifting devices are generally bulky and inconvenient to carry. In special environments, due to limitations, vehicles may not be able to drive onto the lifting device, thus preventing effective lifting.

[0004] Currently, scissor lifts are gaining increasing market share due to their advantages such as simple structure, good synchronization, and land saving. A scissor lift generally consists of three parts: two identical lifting frames, a hydraulic system, and an electrical control system. The lifting frame includes the lifting platform, a base, and scissor arms installed between the lifting platform and the base. When the scissor lift is working, the electrical system controls the hydraulic system to output hydraulic oil as power, driving the piston rod of the hydraulic cylinder to extend and retract, thus opening and closing the scissor arms, achieving the raising and lowering of the lifting platform. Before use, the two lifting platforms need to be leveled to ensure synchronized raising and lowering when lifting vehicles. However, currently, scissor lifts are only suitable for lifting small vehicles. For lifting large vehicles, the scissor arms cannot provide sufficient driving force, especially when the vehicle is heavy, making leveling impossible.

[0005] Existing hydraulic lifting systems for large vehicles typically employ two main cylinders and two auxiliary cylinders, with cross-connected hydraulic circuits. A hydraulic motor and a power unit pump drive the hydraulic oil, which enters the hydraulic motor's inlet via a single hydraulic pipe. The hydraulic motor's outlet branches into four separate hydraulic pipes, extending into the lower chamber of the cylinders. Simultaneously, the lifting platform rises and falls, requiring manual oil replenishment for leveling, with adjustment accuracy entirely dependent on visual inspection. Furthermore, during lifting and lowering, the varying weights of different parts of a large vehicle can easily lead to uneven load distribution and imbalance on the lifting platform, causing the vehicle to tilt and posing a serious safety hazard. Summary of the Invention

[0006] In order to overcome the shortcomings of existing technical solutions, this utility model provides a hydraulic lifting system that can automatically level itself during the lifting process of the lifting device, and in particular solves the technical problem of uneven load imbalance of the lifting platform when the lifting platform of the lifting device is rising and falling.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: A hydraulic lifting system for a lifting device is provided, including a hydraulic control module, a first cylinder assembly, and a second cylinder assembly; the first cylinder assembly includes at least two cylinders, and the second cylinder assembly includes at least four cylinders; the first cylinder assembly and the second cylinder assembly are connected in series via pipelines; the first cylinder assembly includes a mechanical leveling structure, which is used to control the simultaneous extension and retraction of the piston rod of each cylinder in the first cylinder assembly; the lifting device includes at least two support structures. The second cylinder assembly of the lifting system is mounted on the support structures; the lifting device also includes a lifting platform, and the support structures are connected to the lifting platform.

[0008] Preferably, the first hydraulic cylinder assembly includes four hydraulic cylinders, the second hydraulic cylinder assembly includes four hydraulic cylinders, and the lifting device includes four support structures; the four hydraulic cylinders in the second hydraulic cylinder assembly are respectively disposed in the four support structures of the lifting device. The piston rods in the hydraulic cylinders are connected to the support structures via couplings, and the vertical lifting and lowering of the support structures is controlled by the extension and retraction of the piston rods.

[0009] Preferably, the first hydraulic cylinder assembly includes a first main hydraulic cylinder, a second main hydraulic cylinder, a third main hydraulic cylinder, and a fourth main hydraulic cylinder, which are connected in parallel. The second hydraulic cylinder assembly includes a first auxiliary hydraulic cylinder, a second auxiliary hydraulic cylinder, a third auxiliary hydraulic cylinder, and a fourth auxiliary hydraulic cylinder, which are connected in parallel. The first main hydraulic cylinder and the first auxiliary hydraulic cylinder are connected in series via pipelines. The second main hydraulic cylinder and the second auxiliary hydraulic cylinder are connected in series via pipelines. The third main hydraulic cylinder and the third auxiliary hydraulic cylinder are connected in series via pipelines. The fourth main hydraulic cylinder and the fourth auxiliary hydraulic cylinder are connected in series via pipelines.

[0010] Preferably, the first hydraulic cylinder assembly includes two hydraulic cylinders, the second hydraulic cylinder assembly includes eight hydraulic cylinders, and the lifting device includes four support structures; the eight hydraulic cylinders in the second hydraulic cylinder assembly are arranged in pairs in the four support structures of the lifting device. The piston rods in the two hydraulic cylinders are connected to the support structures via couplings, and the vertical lifting of the support structures is controlled by the extension and retraction of the piston rods.

[0011] Preferably, the first cylinder assembly includes a first main cylinder and a second main cylinder, which are connected in parallel; the second cylinder assembly includes a first auxiliary cylinder, a second auxiliary cylinder, a third auxiliary cylinder, a fourth auxiliary cylinder, a fifth auxiliary cylinder, a sixth auxiliary cylinder, a seventh auxiliary cylinder, and an eighth auxiliary cylinder; the first main cylinder is connected in series with the first, second, third, and fourth auxiliary cylinders via pipelines; the second main cylinder is connected in series with the fifth, sixth, seventh, and eighth auxiliary cylinders via pipelines; or, the second cylinder assembly includes the first and second auxiliary cylinders connected in series, the third and fourth auxiliary cylinders connected in series, the fifth and sixth auxiliary cylinders connected in series, and the seventh and eighth auxiliary cylinders connected in series; the first main cylinder is connected in series with the first and third auxiliary cylinders via pipelines; the second main cylinder is connected in series with the fifth and seventh auxiliary cylinders via pipelines.

[0012] Preferably, the lifting device includes four support structures, with the first auxiliary cylinder, the second auxiliary cylinder, the third auxiliary cylinder, and the fourth auxiliary cylinder respectively disposed in the four support structures of the lifting device; or, the first auxiliary cylinder, the third auxiliary cylinder, the fifth auxiliary cylinder, and the seventh auxiliary cylinder respectively disposed in the four support structures of the lifting device.

[0013] Preferably, the lifting device includes four support structures, with the first auxiliary cylinder, the second auxiliary cylinder, the third auxiliary cylinder, and the fourth auxiliary cylinder respectively disposed in two support structures of the lifting device; or, the first auxiliary cylinder, the third auxiliary cylinder, the fifth auxiliary cylinder, and the seventh auxiliary cylinder respectively disposed in two support structures of the lifting device.

[0014] Another technical solution adopted by this utility model to solve its technical problem is: a hydraulic lifting system for a lifting device, including a hydraulic control module, a first cylinder assembly, and a second cylinder assembly; characterized in that the first cylinder assembly includes two cylinders, and the second cylinder assembly includes eight cylinders; the first cylinder assembly and the second cylinder assembly are connected in series through pipelines; the first cylinder assembly includes a mechanical leveling structure, which is used to control the simultaneous extension and retraction of the piston rod of each cylinder in the first cylinder assembly; the lifting device includes four support structures; the eight cylinders in the second cylinder assembly are arranged in pairs in the four support structures of the lifting device;

[0015] The first hydraulic cylinder assembly includes a first main hydraulic cylinder and a second main hydraulic cylinder, which are connected in parallel. The second hydraulic cylinder assembly includes a first auxiliary hydraulic cylinder, a second auxiliary hydraulic cylinder, a third auxiliary hydraulic cylinder, a fourth auxiliary hydraulic cylinder, a fifth auxiliary hydraulic cylinder, a sixth auxiliary hydraulic cylinder, a seventh auxiliary hydraulic cylinder, and an eighth auxiliary hydraulic cylinder.

[0016] The first auxiliary cylinder and the second auxiliary cylinder are connected in series through pipelines, the third auxiliary cylinder and the fourth auxiliary cylinder are connected in series through pipelines, the fifth auxiliary cylinder and the sixth auxiliary cylinder are connected in series through pipelines, and the seventh auxiliary cylinder and the eighth auxiliary cylinder are connected in series through pipelines.

[0017] The first main hydraulic cylinder is connected in series with the first auxiliary hydraulic cylinder and the third auxiliary hydraulic cylinder through pipelines;

[0018] The second main hydraulic cylinder is connected in series with the fifth and seventh auxiliary hydraulic cylinders via pipelines.

[0019] Preferably, the four support structures include a first support structure, a second support structure, a third support structure, and a fourth support structure;

[0020] The first auxiliary cylinder and the fourth auxiliary cylinder are disposed in the first support structure;

[0021] The second auxiliary cylinder and the third auxiliary cylinder are disposed in the second support structure;

[0022] The fifth auxiliary hydraulic cylinder and the eighth auxiliary hydraulic cylinder are disposed in the third support structure;

[0023] The sixth and seventh auxiliary hydraulic cylinders are disposed in the fourth support structure;

[0024] or,

[0025] The first auxiliary hydraulic cylinder and the second auxiliary hydraulic cylinder are disposed in the first support structure;

[0026] The third auxiliary cylinder and the fourth auxiliary cylinder are disposed in the second support structure;

[0027] The fifth auxiliary cylinder and the sixth auxiliary cylinder are disposed in the third support structure;

[0028] The seventh and eighth auxiliary cylinders are housed in the fourth support structure.

[0029] Preferably, the hydraulic control module includes a power supply unit and a lifting control unit.

[0030] Preferably, the hydraulic lifting system further includes a hydraulic module, which includes an oil tank, a gear pump, a check valve, a solenoid unloading valve, and a pressure compensation valve.

[0031] Preferably, the oil tank and the first oil cylinder are connected in series; the oil outlet of the hydraulic module is connected to the oil inlet of the first main oil cylinder through a first oil pipe; the oil outlet of the hydraulic module is connected to the oil inlet of the second main oil cylinder through a second oil pipe; the oil outlet of the hydraulic module is connected to the oil inlet of the third main oil cylinder through a third oil pipe; and the oil outlet of the hydraulic module is connected to the oil inlet of the fourth main oil cylinder through a fourth oil pipe.

[0032] Preferably, the first hydraulic cylinder assembly and the second hydraulic cylinder assembly are connected in series; the oil outlet of the first main hydraulic cylinder is connected to the oil inlet of the first auxiliary hydraulic cylinder through a fifth oil pipe; the oil outlet of the second main hydraulic cylinder is connected to the oil inlet of the second auxiliary hydraulic cylinder through a sixth oil pipe; the oil outlet of the third main hydraulic cylinder is connected to the oil inlet of the third auxiliary hydraulic cylinder through a seventh oil pipe; and the oil outlet of the fourth main hydraulic cylinder is connected to the oil inlet of the fourth auxiliary hydraulic cylinder through an eighth oil pipe.

[0033] Preferably, the second hydraulic cylinder assembly is connected in series with the oil tank; the oil outlet of the first auxiliary hydraulic cylinder is connected to the oil inlet of the oil tank through the ninth oil pipe; the oil outlet of the second auxiliary hydraulic cylinder is connected to the oil inlet of the oil tank through the tenth oil pipe; the oil outlet of the third auxiliary hydraulic cylinder is connected to the oil inlet of the oil tank through the eleventh oil pipe; and the oil outlet of the fourth auxiliary hydraulic cylinder is connected to the oil inlet of the oil tank through the twelfth oil pipe.

[0034] Preferably, the main cylinder and auxiliary cylinder include a cylinder body, a piston, a piston rod, a guide sleeve, a valve core, and a sealing ring.

[0035] Preferably, the valve core structure includes an upper valve stem striker, a compression spring, a valve body, a sealing ring, a lower valve stem striker, and a lower valve body seat.

[0036] Preferably, the main cylinder and the auxiliary cylinder have the same or different cylinder diameters.

[0037] The purpose of this invention is also to improve a lifting device, including the hydraulic lifting system described in this invention.

[0038] The technical solution of this utility model has achieved beneficial technical effects compared with the prior art:

[0039] The hydraulic lifting system for lifting devices provided by this utility model has a simple leveling operation and stable automatic leveling performance of the lifting platform. After the first and second oil cylinder assemblies are filled with hydraulic oil, the pressure is stable. When the lifting platform rises and falls, it can automatically adjust its balance, which solves the technical problem of uneven load and imbalance of the lifting platform due to the center of gravity of the vehicle or heavy object on the lifting platform deviating from the center point.

[0040] The hydraulic lifting system for lifting devices provided by this utility model ensures that the lifting platform is parallel to the ground during the lifting and lowering process, and when the lifting platform is raised to a certain position and remains stable. Large vehicles or heavy objects placed on the lifting platform are more stable. When working on the lifting platform, the deformation of the lifting platform is minimal, which can meet the high-precision requirements of four-wheel alignment for automobiles.

[0041] The hydraulic lifting system for lifting devices provided by this utility model has the advantages of being fast and efficient. It can quickly lift or lower large vehicles or heavy objects to the required height, saving working time and labor costs, saving energy, and improving production efficiency.

[0042] The hydraulic lifting system for lifting devices provided by this utility model has a relatively simple structure and is easy to maintain. In daily use, only regular inspection and maintenance are needed to ensure the normal operation of the equipment, which not only increases the service life of the equipment, but also reduces the possibility of hydraulic lifting system failure.

[0043] The hydraulic lifting system for lifting devices provided by this utility model adopts a mechanical leveling structure to stabilize support and load-bearing capacity, making the lifting device safer and more reliable. It can ensure the lifting stability of large vehicles and heavy objects and reduce the possibility of accidents.

[0044] The hydraulic lifting system for a lifting device provided by this utility model solves the technical problem of uneven load imbalance on the lifting platform due to the center of gravity of the vehicle or heavy object deviating from the center point. Furthermore, it simplifies the structure, making it more stable and reliable. This is achieved by configuring the connection relationship of eight auxiliary cylinders in the second cylinder assembly. The first and second auxiliary cylinders are connected in series via pipelines; the third and fourth auxiliary cylinders are connected in series via pipelines; the fifth and eighth auxiliary cylinders are connected in series via pipelines; and the seventh and eighth auxiliary cylinders are connected in series via pipelines. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1This is a schematic diagram of the first mechanical leveling device in the first cylinder assembly of the hydraulic lifting system for the lifting device provided by this utility model.

[0047] Figure 2 This is a schematic diagram of the structure of the second mechanical leveling device in the first cylinder assembly of the hydraulic lifting system for the lifting device provided by this utility model;

[0048] Figure 3 This is a schematic diagram of the valve core in the oil cylinder provided by this utility model;

[0049] Figure 4 This is a structural schematic diagram of the lifting system (4X4) for the lifting device provided by this utility model;

[0050] Figure 5 This is a structural schematic diagram of the lifting system (2X8) for the lifting device provided by this utility model;

[0051] Figure 6 This is a circuit diagram of a lifting system for a lifting device provided by this utility model;

[0052] Figure 7 This is a structural diagram of the hydraulic cylinder used in the lifting system of the lifting device provided by this utility model;

[0053] Figure 8 This is a side view of the lifting device used in the lifting system (4X4) provided by this utility model;

[0054] Figure 9 This is a three-dimensional structural diagram of the lifting device used in the lifting system (4X4) provided by this utility model;

[0055] Figure 10 This is a side view of the lifting device used in the lifting system (2X8) provided by this utility model;

[0056] Figure 11 This is a three-dimensional structural diagram of the lifting device used in the lifting system (2X8) provided by this utility model;

[0057] Figure 12 This is a three-dimensional front view of the lifting device used in the lifting system (2X8) provided by this utility model;

[0058] Figure 13 This is a schematic diagram of the right side of the lifting device used in the lifting system (2X8) provided by this utility model;

[0059] Figure 14 This is a schematic diagram of the left side structure of the lifting device used in the lifting system (2X8) provided by this utility model;

[0060] Figure 15 This is a schematic diagram of the first cylinder assembly structure in the hydraulic lifting system (2X8) for lifting devices provided by this utility model;

[0061] Notes: 1-Mechanical leveling structure; 2-Bracket; 3-Main cylinder piston rod; 4-Valve rod upper striker; 5-Compression spring; 6-Valve body; 7-Sealing ring; 8-Valve rod lower striker; 9-Valve body lower seat; 10-Piston; 11-Pressure compensation valve; 12-Relief valve; 13-Gear pump; 14-Oil filter; 15-Oil tank; 16-Motor; 17-Check valve; 18-Solenoid valve; 19-Main cylinder assembly; 20-Auxiliary cylinder assembly; 21-Lower support arm; 22-Upper outer support arm; 23-Upper inner support arm; 24-Auxiliary bracket; 25-Lifting hydraulic cylinder; 26-Safety locking device; 27-Base; 28-Lifting platform. Detailed Implementation

[0062] Example 1

[0063] The present invention provides the lifting and leveling working principle of a hydraulic lifting system for lifting devices.

[0064] The hydraulic lifting system provided by this utility model, during the hydraulic lifting and leveling process, activates the motor power switch in the hydraulic control module, causing hydraulic oil to enter the main cylinder from the oil tank via the hydraulic pump. As the hydraulic oil enters, the piston rod in the main cylinder gradually extends. When the piston rod reaches the top of the main cylinder, the valve core in the main cylinder contacts the guide sleeve, opening the valve core and automatically venting the hydraulic oil and gas in the lower chamber of the main cylinder to the upper chamber. The hydraulic oil in the upper chamber of the main cylinder enters the lower chamber of the auxiliary cylinder through the connecting oil pipe. As the hydraulic oil enters, the piston rod in the auxiliary cylinder gradually extends. When it reaches the top of the auxiliary cylinder, the valve core contacts the guide sleeve, opening the valve core and automatically venting the hydraulic oil and gas in the lower chamber of the auxiliary cylinder to the upper chamber. The hydraulic oil flows back to the oil tank through the connecting oil pipe. The entire process ensures that all air in the oil pipes, main cylinder, and auxiliary cylinder is eliminated, and the lifting platform is raised to its highest position. Because it is necessary to completely remove the air from the main and auxiliary cylinders, after the lifting platform is raised to the highest point, the motor power needs to be kept running for about 20 to 30 seconds until the air in the cylinders is completely removed, and then the mechanical lock on the lifting device should be tightened.

[0065] When the lifting platform needs to be lowered, the mechanical lock on the lifting device is opened, and the power switch of the electromagnetic unloading valve in the hydraulic control module is activated to open the electromagnetic unloading valve. At the same time, the power switch of the pressure compensation valve in the hydraulic control module is activated to open the pressure compensation valve. The hydraulic oil is controlled to flow from the main cylinder back to the oil tank through the electromagnetic unloading valve and the pressure compensation valve. The piston rods in the main cylinder and the auxiliary cylinder drive the valve core to disengage from the guide sleeve. At this time, the valve core closes, sealing the upper chamber of the main cylinder and the auxiliary cylinder, so that the hydraulic oil in the upper and lower chambers of the main cylinder and the auxiliary cylinder does not flow, and the hydraulic oil volume in the lower chamber of the auxiliary cylinder is equal, thus realizing the automatic leveling of the lifting platform.

[0066] Example 2

[0067] The hydraulic lifting system for lifting devices provided by this utility model adopts a parallel arrangement of four main oil cylinders, such as... Figure 1 and Figure 2 As shown, the mechanical leveling structure (1) ensures that the piston rods (3) in the four main cylinders are in the same relative position when they extend and retract. When the lifting platform descends and gravity loads are uneven, the piston rods (3) in the four main cylinders are connected to the mechanical leveling structure (1), and their descent is synchronized, ensuring consistent working pressure in the four auxiliary cylinders. The main cylinder is fixedly connected to the bracket (2), and the main cylinder is fixed relative to the bracket (2); the piston rods (3) in the main cylinder are fixedly connected to the mechanical leveling structure (1), and the mechanical leveling structure (1) is connected to the bracket (2) through a cylindrical sleeve or slide. The mechanical leveling structure (1) can move up and down synchronously with the piston rods (3) in the four main cylinders through the cylindrical sleeve or slide.

[0068] Example 3

[0069] The hydraulic lifting system for a lifting device provided by this utility model has the following valve core structure: Figure 3As shown. The valve core includes an upper valve stem striker (4), a compression spring (5), a valve body (6), a sealing ring (7), a lower valve stem striker (8), and a lower valve body seat (9). The valve core is installed on the pistons (10) of the main cylinder and the auxiliary cylinder. The valve body (6) is externally connected to the piston (10) through a sealing ring (7) to ensure that the valve body (6) is externally sealed and does not leak oil. The lower part of the valve body (6) is threadedly fastened to the lower valve body seat (9). The lower valve body seat (9) is externally sealed and does not leak oil through a sealing ring (7). The upper valve stem striker (4) and the compression spring (5) are installed inside the valve body (6) along with the lower valve stem striker (8). The upper valve stem striker (4) and the valve body (6) adopt a conical surface design to ensure a seal and prevent oil leakage. The lower valve stem striker (8) and the lower valve body seat are connected to the lower valve body seat. (9) The end face positioning allows oil to pass through. Under the action of the compression spring (5), the upper valve stem striker (4) and the lower valve stem striker (8) make the upper valve stem striker (4) and the valve body (6) form a seal. Only when the piston rod is extended to its longest length will the upper valve stem striker (4) contact the oil cylinder guide sleeve, creating a gap in the corner seal. Only then can the oil and air in the lower chamber of the oil cylinder pass through the valve core and enter the upper chamber of the oil cylinder. When the oil cylinder piston rod (3) retracts, the upper valve stem striker (4) separates from the oil cylinder guide sleeve, causing the hydraulic oil in the upper and lower chambers of the main oil cylinder and the auxiliary oil cylinder to separate, and there is no air in the oil cylinder.

[0070] Example 4

[0071] The hydraulic lifting system for lifting devices provided by this utility model is as follows: Figure 4 As shown.

[0072] The hydraulic lifting system for lifting devices provided by this utility model includes a hydraulic control module, a hydraulic module, a main cylinder assembly (19), and an auxiliary cylinder assembly (20).

[0073] The hydraulic module includes a pressure compensation valve (11), a relief valve (12), a gear pump (13), an oil filter (14), an oil tank (15), a motor (16), a check valve (17), and an electromagnetic unloading valve (18).

[0074] The hydraulic control module includes a power supply unit and a control unit; the power supply unit consists of laid circuitry used to connect and disconnect the circuitry, as shown in the circuit diagram. Figure 6 As shown. The control unit includes control buttons for lifting and lowering via control circuitry, and includes a motor power switch, an electromagnetic unloading valve power switch, and a pressure compensation valve power switch.

[0075] The main cylinder assembly (19) includes, as follows: Figure 4The four main hydraulic cylinders shown are connected in parallel; the auxiliary hydraulic cylinder assembly (20) includes four auxiliary hydraulic cylinders respectively installed in the lifting device bracket; the specific structures of the main and auxiliary hydraulic cylinders include cylinder bodies, pistons, piston rods, guide sleeves, valve cores, and sealing rings. The specific structure of the hydraulic cylinders used in the hydraulic lifting system provided by this utility model is as follows: Figure 7 As shown.

[0076] When the lifting device needs to be raised, the motor power switch is controlled to make the motor (16) rotate clockwise, which drives the gear pump (13) to rotate. The hydraulic oil is drawn from the oil tank (15) through the oil filter (14) into the gear pump (13). The gear pump (13) supplies the hydraulic oil to the check valve (17) and the relief valve (12) at the same time. When the pressure of the hydraulic oil is greater than the pressure set by the relief valve (12), the relief valve (12) overflows the excess hydraulic oil back to the oil tank (15); when the pressure of the hydraulic oil is less than the pressure set by the relief valve (12), the hydraulic oil flows through the check valve (17) and is supplied to the outlet A and the solenoid unloading valve (18) at the same time. Hydraulic oil enters the lower chamber of the four main cylinders through port A from port B of the main cylinder assembly (19), pushing the piston, piston rod, and sealing ring of the main cylinders upward to the top of the four main cylinders. The hydraulic oil then flows out through port C at the top of the four main cylinders, passes through the connected oil pipe to port D of the auxiliary cylinder assembly (20), and enters the lower chamber of the four auxiliary cylinders. This pushes the piston, piston rod, and sealing ring of the four auxiliary cylinders upward to the top of the four auxiliary cylinders, causing all the air in the four auxiliary cylinders to flow out together with the newly entered hydraulic oil from port E of the four auxiliary cylinders to port F of the oil tank (15), thus realizing the functions of automatic air venting and leveling of the cylinders.

[0077] When the lifting device needs to be lowered, the power switches of the electromagnetic unloading valve and the pressure compensation valve are turned on. The hydraulic oil in the main cylinder assembly (19) and the auxiliary cylinder assembly (20) descends, driving the piston rod, piston, and sealing ring to move downwards. The valve rod pin (4) in the valve core separates from the cylinder guide sleeve, the valve rod pin resets, and seals the upper and lower chambers of the cylinder. The lifting platform begins to descend by its own weight, drawing in air from port E of the auxiliary cylinder assembly (20), causing the piston, piston rod, and sealing ring in the four auxiliary cylinders to descend. As the sealing ring moves downward, the hydraulic oil in the lower chambers of the four auxiliary cylinders enters the oil pipe through port D, passes through the top of the main cylinder assembly (19) and enters port C. The pistons, piston rods and sealing rings of the four main cylinders move downward, and the hydraulic oil enters port A through port B. The hydraulic oil flows back from port A through the electromagnetic unloading valve (18) to the pressure compensation valve (11). By adjusting the pressure of the pressure compensation valve (11), the descent time can be made basically the same when the lifting platform is loaded with different weights. Finally, all the hydraulic oil flows back to the oil tank (15).

[0078] Example 5

[0079] The lifting device provided by this utility model is as follows: Figure 8 and Figure 9 As shown, it includes a base (27), a lower support arm (21), an upper outer support arm (22), an upper inner support arm (23), an auxiliary bracket (24), a lifting hydraulic cylinder (25), a safety locking device (26), and a lifting platform (28); the lifting hydraulic cylinder (25) is the auxiliary cylinder assembly (20) in embodiment 4, and the four auxiliary cylinders are respectively set on the four lower support arms (21).

[0080] The upper connecting shaft of the upper inner arm (23) is connected to the lifting platform (28) by a slider.

[0081] The upper end shaft hole of the upper outer support arm (22) is fixed to the lifting platform (28) by a connecting shaft.

[0082] The upper inner arm (23) and the upper outer arm (22) are hinged at their central axes by a connecting shaft, making the arms X-shaped.

[0083] The lower end of the upper inner arm (23) is hinged to the upper end of the auxiliary bracket (24) via a connecting shaft.

[0084] The lower shaft hole of the upper inner arm (23) is hinged to the piston rod of the lifting hydraulic cylinder (25) and the upper locking hook of the safety locking device (26) via a connecting shaft.

[0085] The lower part of the lifting hydraulic cylinder (25) is hinged to the central shaft hole of the lower support arm (21) and the locking box of the safety locking device (26) via a connecting shaft.

[0086] The safety locking device (26) includes a lock box and a lock hook. The lock hook is hinged to the piston rod of the lifting hydraulic cylinder (25) by a pin, and the lock box is hinged to the base of the lifting hydraulic cylinder (25) by a pin. The lock hook is welded with a rack, and the lock box is welded with a rack. The racks are engaged during operation. The cylinder is controlled by the air circuit to unlock and lock, thus playing the role of a safety lock.

[0087] The upper end shaft hole of the lower support arm (21) and the lower end shaft hole of the upper outer support arm (22) are hinged by a connecting shaft.

[0088] The upper end shaft hole of the lower support arm (21) and the lower end shaft hole of the auxiliary bracket (24) are hinged by a connecting shaft.

[0089] The lower end shaft hole of the lower support arm (21) is hinged to the base (27) via a connecting shaft.

[0090] The base (27) is fixed to the ground with expansion bolts to ensure structural support during the lifting process of the lower support arm (21).

[0091] The upper end shaft hole of the upper outer arm (22) and the lower end shaft hole of the lower arm (21) form two fixed support points to ensure that the lifting system works stably during operation.

[0092] The lifting hydraulic cylinder (25) extends through the hydraulic system, pushing the lower shaft of the upper inner arm (23). The central shaft of the upper inner arm (23) and the central shaft of the upper outer arm (22), the lower shaft of the upper outer arm (22) and the upper shaft of the lower arm (21), the upper end shaft of the lower arm (21) and the lower shaft of the auxiliary support (24), and the lower shaft of the upper inner arm (23) and the upper shaft of the auxiliary support (24) form a parallelogram mechanism. Stable extension and retraction make the platform lift and lower smoothly, improving the accuracy of the lifting machine.

[0093] Example 6

[0094] The hydraulic lifting system for lifting devices provided by this utility model is as follows: Figure 5 As shown.

[0095] The hydraulic lifting system for lifting devices provided by this utility model includes a hydraulic control module, a hydraulic module, a main cylinder assembly (19), and an auxiliary cylinder assembly (20).

[0096] The hydraulic module includes a pressure compensation valve (11), a relief valve (12), a gear pump (13), an oil filter (14), an oil tank (15), a motor (16), a check valve (17), and an electromagnetic unloading valve (18).

[0097] The hydraulic control module includes a power supply unit and a control unit; the power supply unit consists of laid circuitry used to connect and disconnect the circuitry, as shown in the circuit diagram. Figure 6 As shown. The control unit includes control buttons for lifting and lowering via control circuitry, and includes a motor power switch, an electromagnetic unloading valve power switch, and a pressure compensation valve power switch.

[0098] The main cylinder assembly (19) includes, as follows: Figure 5 The two main hydraulic cylinders shown are connected in parallel; these two main hydraulic cylinders are the first main hydraulic cylinder and the second main hydraulic cylinder, as follows: Figure 15As shown, the mechanical leveling structure is placed at the top of the piston rods of the two main cylinders, which can ensure that the relative positions of the piston rods (3) in the two main cylinders are consistent when they extend and retract. The auxiliary cylinder assembly (20) includes eight auxiliary cylinders respectively set in the lifting device bracket; these eight auxiliary cylinders are the first auxiliary cylinder, the second auxiliary cylinder, the third auxiliary cylinder, the fourth auxiliary cylinder, the fifth auxiliary cylinder, the sixth auxiliary cylinder, the seventh auxiliary cylinder, and the eighth auxiliary cylinder; the first auxiliary cylinder and the second auxiliary cylinder are connected in series through pipelines, the third auxiliary cylinder and the fourth auxiliary cylinder are connected in series through pipelines, the fifth auxiliary cylinder and the sixth auxiliary cylinder are connected in series through pipelines, and the seventh auxiliary cylinder and the eighth auxiliary cylinder are connected in series through pipelines.

[0099] The lifting device includes four support structures;

[0100] The eight auxiliary cylinders in the auxiliary cylinder assembly are arranged in pairs in the four support structures of the lifting device, such as... Figure 10-12 As shown,;

[0101] The four support structures include a first support structure, a second support structure, a third support structure, and a fourth support structure;

[0102] like Figure 14 As shown, the first auxiliary cylinder and the fourth auxiliary cylinder are disposed in the first support structure;

[0103] like Figure 13 As shown, the second auxiliary cylinder and the third auxiliary cylinder are disposed in the second support structure;

[0104] like Figure 14 As shown, the fifth auxiliary cylinder and the eighth auxiliary cylinder are disposed in the third support structure;

[0105] like Figure 13 As shown, the sixth auxiliary cylinder and the seventh auxiliary cylinder are disposed in the fourth support structure;

[0106] or,

[0107] The first auxiliary hydraulic cylinder and the second auxiliary hydraulic cylinder are disposed in the first support structure;

[0108] The third auxiliary cylinder and the fourth auxiliary cylinder are disposed in the second support structure;

[0109] The fifth auxiliary cylinder and the sixth auxiliary cylinder are disposed in the third support structure;

[0110] The seventh and eighth auxiliary cylinders are housed in the fourth support structure.

[0111] The specific structures of the main cylinder and auxiliary cylinder include cylinder body, piston, piston rod body, guide sleeve, valve core, and sealing ring.

[0112] The hydraulic cylinder structure used in the hydraulic lifting system provided by this utility model is as follows: Figure 7 As shown.

[0113] When the lifting device needs to be raised, the motor power switch is controlled to make the motor (16) rotate clockwise, which drives the gear pump (13) to rotate. The hydraulic oil is drawn from the oil tank (15) through the oil filter (14) into the gear pump (13). The gear pump (13) supplies the hydraulic oil to the check valve (17) and the relief valve (12) at the same time. When the pressure of the hydraulic oil is greater than the pressure set by the relief valve (12), the relief valve (12) overflows the excess hydraulic oil back to the oil tank (15); when the pressure of the hydraulic oil is less than the pressure set by the relief valve (12), the hydraulic oil flows through the check valve (17) and is supplied to the outlet A and the solenoid unloading valve (18) at the same time. Hydraulic oil enters the lower chamber of the two main cylinders through port A from port B of the main cylinder assembly (19), pushing the piston, piston rod, and sealing ring of the main cylinders upward to the top of the two main cylinders. The hydraulic oil then flows out through port C at the top of the two main cylinders, passes through the connected oil pipe to port D of the auxiliary cylinder assembly (20), and enters the lower chamber of the four auxiliary cylinders. This pushes the piston, piston rod, and sealing ring of the four auxiliary cylinders upward to the top of the four auxiliary cylinders. All the air in the four auxiliary cylinders, along with the newly entered hydraulic oil, flows out from port E of the four auxiliary cylinders to port F of the four auxiliary cylinders, and enters the lower chamber of the four auxiliary cylinders. This pushes the piston, piston rod, and sealing ring of the four auxiliary cylinders upward to the top of the four auxiliary cylinders. All the air in the four auxiliary cylinders, along with the newly entered hydraulic oil, flows out from port G of the four auxiliary cylinders to port H of the oil tank (15), thus realizing the functions of automatic air venting and leveling of the cylinders.

[0114] When the lifting device needs to be lowered, turn on the power switch of the electromagnetic unloading valve and the power switch of the pressure compensation valve. The hydraulic oil in the main cylinder assembly (19) and the auxiliary cylinder assembly (20) descends, driving the piston rod, piston, and sealing ring to move downwards. The valve rod upper striker (4) in the valve core separates from the cylinder guide sleeve, the valve rod upper striker resets and seals the upper and lower chambers of the cylinder. The lifting platform begins to descend by its own weight, drawing in air from the G port of the auxiliary cylinder assembly (20), causing the pistons, piston rods, and sealing rings in the four auxiliary cylinders to move downwards. The hydraulic oil in the lower chambers of the four auxiliary cylinders enters the oil pipe through the F port. The hydraulic oil passes through the four... The E port of the auxiliary cylinder enters the four auxiliary cylinders, causing the pistons, piston rods, and sealing rings in the four auxiliary cylinders to move downwards. The hydraulic oil in the lower chamber of the four auxiliary cylinders enters the oil pipe through the D port, passes through the top of the main cylinder assembly (19), and enters the C port. The pistons, piston rods, and sealing rings of the two main cylinders move downwards, and the hydraulic oil enters the A port through the B port. The hydraulic oil flows back from the A port through the electromagnetic unloading valve (18) to the pressure compensation valve (11). By adjusting the pressure of the pressure compensation valve (11), the descent time can be made basically the same when the lifting platform is loaded with different weights. Finally, all the hydraulic oil flows back to the oil tank (15).

[0115] Example 7

[0116] The lifting device provided by this utility model is as follows: Figure 10 , Figure 11 As shown, it includes a base (27), a lower support arm (21), an upper outer support arm (22), an upper inner support arm (23), an auxiliary bracket (24), a lifting hydraulic cylinder (25), a safety locking device (26), and a lifting platform (28); the lifting hydraulic cylinder (25) is the auxiliary cylinder assembly (20) in embodiment 6, and the eight auxiliary cylinders are arranged in pairs on the four lower support arms (21).

[0117] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A hydraulic lifting system for a lifting device, comprising a hydraulic control module, a first cylinder assembly, a second cylinder assembly; characterized in that, The first hydraulic cylinder assembly includes at least two hydraulic cylinders, and the second hydraulic cylinder assembly includes at least four hydraulic cylinders; the first hydraulic cylinder assembly and the second hydraulic cylinder assembly are connected in series through pipelines; the first hydraulic cylinder assembly includes a mechanical leveling structure, which is used to control the simultaneous extension and retraction of the piston rod of each hydraulic cylinder in the first hydraulic cylinder assembly; the lifting device includes at least two support structures.

2. The hydraulic lift system for a lift device of claim 1, wherein, The first hydraulic cylinder assembly includes four hydraulic cylinders, the second hydraulic cylinder assembly includes four hydraulic cylinders, and the lifting device includes four support structures; the four hydraulic cylinders in the second hydraulic cylinder assembly are respectively disposed in the four support structures of the lifting device.

3. The hydraulic lift system for a lift device of claim 2, wherein, The first hydraulic cylinder assembly includes a first main hydraulic cylinder, a second main hydraulic cylinder, a third main hydraulic cylinder, and a fourth main hydraulic cylinder, which are connected in parallel. The second hydraulic cylinder assembly includes a first auxiliary hydraulic cylinder, a second auxiliary hydraulic cylinder, a third auxiliary hydraulic cylinder, and a fourth auxiliary hydraulic cylinder, which are also connected in parallel. The first main hydraulic cylinder and the first auxiliary hydraulic cylinder are connected in series via pipelines. The second main hydraulic cylinder and the second auxiliary hydraulic cylinder are connected in series via pipelines. The third main hydraulic cylinder and the third auxiliary hydraulic cylinder are connected in series via pipelines. The fourth main hydraulic cylinder and the fourth auxiliary hydraulic cylinder are connected in series via pipelines.

4. The hydraulic lift system for a lift device of claim 1, wherein, The first hydraulic cylinder assembly includes two hydraulic cylinders, the second hydraulic cylinder assembly includes eight hydraulic cylinders, and the lifting device includes four support structures; the eight hydraulic cylinders in the second hydraulic cylinder assembly are arranged in pairs in the four support structures of the lifting device.

5. The hydraulic lift system for a lift device of claim 4, wherein, The first hydraulic cylinder assembly includes a first main hydraulic cylinder and a second main hydraulic cylinder, which are connected in parallel. The second hydraulic cylinder assembly includes a first auxiliary hydraulic cylinder, a second auxiliary hydraulic cylinder, a third auxiliary hydraulic cylinder, a fourth auxiliary hydraulic cylinder, a fifth auxiliary hydraulic cylinder, a sixth auxiliary hydraulic cylinder, a seventh auxiliary hydraulic cylinder, and an eighth auxiliary hydraulic cylinder. The first main hydraulic cylinder is connected in series with the first, second, third, and fourth auxiliary hydraulic cylinders via pipelines. The second main hydraulic cylinder is connected in series with the fifth, sixth, seventh, and eighth auxiliary hydraulic cylinders via pipelines. Alternatively, the second hydraulic cylinder assembly includes the first and second auxiliary hydraulic cylinders connected in series, the third and fourth auxiliary hydraulic cylinders connected in series, the fifth and sixth auxiliary hydraulic cylinders connected in series, and the seventh and eighth auxiliary hydraulic cylinders connected in series. The first main hydraulic cylinder is connected in series with the first and third auxiliary hydraulic cylinders via pipelines. The second main hydraulic cylinder is connected in series with the fifth and seventh auxiliary hydraulic cylinders via pipelines.

6. The hydraulic lift system for a lift device of claim 5, wherein, The lifting device includes four support structures, and the first auxiliary cylinder, the second auxiliary cylinder, the third auxiliary cylinder, and the fourth auxiliary cylinder are respectively installed in the four support structures of the lifting device; Alternatively, the first, third, fifth, and seventh auxiliary cylinders can be installed in the four support structures of the lifting device.

7. The hydraulic lift system for a lift device of claim 5, wherein, The lifting device includes four support structures. The first auxiliary cylinder, the second auxiliary cylinder, the third auxiliary cylinder, and the fourth auxiliary cylinder are respectively installed in two support structures of the lifting device; or, the first auxiliary cylinder, the third auxiliary cylinder, the fifth auxiliary cylinder, and the seventh auxiliary cylinder are respectively installed in two support structures of the lifting device.

8. A hydraulic lifting system for a lifting device, comprising a hydraulic control module, a first cylinder assembly, and a second cylinder assembly; characterized in that, The first hydraulic cylinder assembly includes two hydraulic cylinders, and the second hydraulic cylinder assembly includes eight hydraulic cylinders; the first and second hydraulic cylinder assemblies are connected in series via pipelines; the first hydraulic cylinder assembly includes a mechanical leveling structure, which is used to control the simultaneous extension and retraction of the piston rod of each hydraulic cylinder in the first hydraulic cylinder assembly; the lifting device includes four support structures; the eight hydraulic cylinders in the second hydraulic cylinder assembly are arranged in pairs in the four support structures of the lifting device. The first hydraulic cylinder assembly includes a first main hydraulic cylinder and a second main hydraulic cylinder, which are connected in parallel. The second hydraulic cylinder assembly includes a first auxiliary hydraulic cylinder, a second auxiliary hydraulic cylinder, a third auxiliary hydraulic cylinder, a fourth auxiliary hydraulic cylinder, a fifth auxiliary hydraulic cylinder, a sixth auxiliary hydraulic cylinder, a seventh auxiliary hydraulic cylinder, and an eighth auxiliary hydraulic cylinder. The first auxiliary cylinder and the second auxiliary cylinder are connected in series through pipelines, the third auxiliary cylinder and the fourth auxiliary cylinder are connected in series through pipelines, the fifth auxiliary cylinder and the sixth auxiliary cylinder are connected in series through pipelines, and the seventh auxiliary cylinder and the eighth auxiliary cylinder are connected in series through pipelines. The first main hydraulic cylinder is connected in series with the first auxiliary hydraulic cylinder and the third auxiliary hydraulic cylinder through pipelines; The second main hydraulic cylinder is connected in series with the fifth and seventh auxiliary hydraulic cylinders via pipelines.

9. The hydraulic lift system for a lift device of claim 8, wherein, The four support structures include a first support structure, a second support structure, a third support structure, and a fourth support structure; The first auxiliary cylinder and the fourth auxiliary cylinder are disposed in the first support structure; The second auxiliary cylinder and the third auxiliary cylinder are disposed in the second support structure; The fifth auxiliary hydraulic cylinder and the eighth auxiliary hydraulic cylinder are disposed in the third support structure; The sixth and seventh auxiliary hydraulic cylinders are disposed in the fourth support structure; or, The first auxiliary hydraulic cylinder and the second auxiliary hydraulic cylinder are disposed in the first support structure; The third auxiliary cylinder and the fourth auxiliary cylinder are disposed in the second support structure; The fifth auxiliary oil cylinder and the sixth auxiliary oil cylinder are disposed in the third support structure; The seventh and eighth auxiliary cylinders are housed in the fourth support structure.

10. Hydraulic lifting system for a lifting device according to any of claims 1-9, characterized in that, The hydraulic control module includes a power supply unit and a lifting control unit; the hydraulic lifting system also includes a hydraulic module, which includes an oil tank, a gear pump, a check valve, a solenoid unloading valve, and a pressure compensation valve.

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