Hydraulic lifting system

Abstract

The utility model discloses a hydraulic lifting system, and relates to the technical field of hydraulic pressure, the hydraulic lifting system is used for lifting an object on a lifting table, the lifting table is provided with a lifting working face, and the hydraulic lifting system comprises a hydraulic cylinder, a hydraulic control unit and a hydraulic auxiliary unit; wherein the multiple hydraulic cylinders are arranged at intervals, and the hydraulic cylinders are fixedly arranged on the side, away from the lifting working face, of the lifting table; the hydraulic control unit is fixedly arranged on the side, away from the lifting table, of the hydraulic cylinder, the hydraulic control unit comprises a plurality of proportional control valves, and the proportional control valves are connected with the hydraulic cylinder; the hydraulic auxiliary unit comprises an energy accumulator and a safety valve set, the safety valve set is installed in the energy accumulator, and the energy accumulator is connected with the hydraulic control unit. According to the technical scheme, the problem that a plurality of hydraulic cylinders in an existing hydraulic system are not synchronous in lifting is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulics, in particular to a hydraulic lifting system. Background Art

[0002] Traditional hydraulic lifting systems typically consist of a hydraulic pump, hydraulic cylinder, solenoid valve, oil tank, and piping. The hydraulic pump pumps fluid from the tank, pressurizes it, and delivers it through piping to the hydraulic cylinder, thereby moving the piston and lifting the load. The solenoid valve regulates the oil flow in and out of the hydraulic cylinder, controlling the speed and direction of the piston's movement.

[0003] However, there are some problems with traditional hydraulic lifting systems. In a hydraulic lifting system where multiple cylinders work together, asynchronous lifting of the cylinders can cause the load to tilt or be unevenly distributed, which not only affects the lifting efficiency but may also cause damage to the equipment or safety hazards. Utility Model Content

[0004] The main purpose of the utility model is to provide a hydraulic lifting system, aiming to solve the problem of asynchronous lifting of multiple hydraulic cylinders in the existing hydraulic system.

[0005] To achieve the above-mentioned purpose, the hydraulic lifting system proposed in the present invention is used to lift and lower objects on a lifting platform. The lifting platform is provided with a lifting working surface. The hydraulic lifting system comprises:

[0006] A plurality of hydraulic cylinders are provided at intervals, and the hydraulic cylinders are fixedly arranged on a side of the lifting platform away from the lifting working surface;

[0007] a hydraulic control unit, fixedly arranged on a side of the hydraulic cylinder away from the lifting platform, the hydraulic control unit comprising a plurality of proportional control valves, and the plurality of proportional control valves are respectively connected to the hydraulic cylinder; and

[0008] The hydraulic auxiliary unit includes an accumulator and a safety valve group. The safety valve group is installed in the accumulator, and the accumulator is connected to the hydraulic control unit.

[0009] In one embodiment, the hydraulic control unit further includes a relief valve, which is disposed at the rod chamber oil port of the hydraulic cylinder and connected to the proportional control valve.

[0010] In one embodiment, the hydraulic control unit further includes a solenoid reversing valve and a hydraulically controlled one-way valve connected to each other, wherein the solenoid reversing valve is used to adjust the flow direction of the oil circuit in the hydraulically controlled one-way valve.

[0011] In one embodiment, the hydraulic control unit has an oil inlet passage and an oil return passage, and the hydraulic control unit further includes a high-pressure filter, wherein the high-pressure filter connects the oil inlet passage and the oil return passage.

[0012] In one embodiment, two groups of the hydraulic auxiliary units are provided, and the two groups of the hydraulic auxiliary units are respectively connected to the oil inlet passage and the oil return passage.

[0013] In one embodiment, the hydraulic lifting system further includes a hydraulic oil storage unit, which includes an oil storage tank. The oil storage tank is divided into two oil circuits, and the two oil circuits are respectively connected to the accumulator and the hydraulic control unit.

[0014] In one embodiment, the hydraulic oil storage unit further includes an oil return filter device, and the oil return filter device is disposed in the oil storage tank to filter the hydraulic oil in the oil storage tank.

[0015] In one embodiment, the hydraulic oil storage unit further includes a liquid level detection device, which is disposed in the oil storage tank to detect changes in the liquid level of the hydraulic oil in the oil storage tank in real time.

[0016] In one embodiment, the hydraulic oil storage unit further includes a heater, which is disposed in the oil storage tank to heat the hydraulic oil in the oil storage tank.

[0017] In one embodiment, the hydraulic oil storage unit further includes a temperature detection device, which is disposed in the oil storage tank to detect the temperature of the hydraulic oil in the oil storage tank in real time.

[0018] In one embodiment, the hydraulic lifting system further includes a hydraulic power unit, wherein the hydraulic power unit is connected to one side of the hydraulic control unit, and the accumulator and the hydraulic oil storage unit are respectively connected to the hydraulic power unit.

[0019] In one embodiment, the hydraulic power unit includes a motor, a coupling, and a hydraulic pump. The motor and the hydraulic pump are connected via the coupling, and the hydraulic pump is connected to the oil storage tank via a connecting pipe.

[0020] In the technical solution of the present invention, by arranging multiple hydraulic cylinders at intervals on the lifting platform, the supporting force can be evenly distributed. The individual proportional control valves in the hydraulic control unit are individually connected to individual hydraulic cylinders. The use of proportional control valves can ensure that the flow and pressure of each cylinder are precisely controlled, thereby achieving synchronization of the cylinder movements. Through a closed-loop control system, the position and pressure of the hydraulic cylinders can be monitored in real time, and the opening of the proportional control valves can be adjusted to compensate for the differences between the hydraulic cylinders and maintain synchronous movement. This solution can improve the smoothness and efficiency of the lifting process and reduce uneven loads and equipment damage caused by asynchrony. The accumulator in the hydraulic auxiliary unit is connected to the hydraulic control unit. By installing the accumulator, pressure fluctuations caused by rapid movements or load changes can be effectively reduced, the system can be protected from hydraulic shocks, and the smoothness and safety of operation can be improved. The safety valve group can provide an auxiliary power source for the hydraulic lifting system, protect the various unit components in the system, and increase the service life of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] Figure 1 This is a structural diagram of an embodiment of a hydraulic lifting system provided by the utility model;

[0023] Figure 2 This is a structural diagram of a hydraulic control unit in an embodiment of a hydraulic lifting system provided by the present invention;

[0024] Figure 3 This is a structural diagram of a hydraulic auxiliary unit in another embodiment of the hydraulic lifting system provided by the present invention;

[0025] Figure 4 A structural diagram of a hydraulic oil storage unit in another embodiment of the hydraulic lifting system provided by the present invention;

[0026] Figure 5 This is a structural diagram of the hydraulic power unit in another embodiment of the hydraulic lifting system provided by the utility model.

[0027] Description of Figure Numbers:

[0028] 100. Hydraulic lifting system; 1. Hydraulic cylinder; 2. Hydraulic control unit; 21. Proportional control valve; 22. Overflow valve; 23. Solenoid reversing valve; 24. Hydraulic-controlled one-way valve; 25. High-pressure filter; 3. Hydraulic auxiliary unit; 31. Accumulator; 32. Safety valve group; 4. Hydraulic oil storage unit; 41. Oil storage tank; 42. Return oil filter device; 43. Liquid level detection device; 44. Heater; 45. Temperature detection device; 5. Hydraulic power unit; 51. Motor; 52. Coupling; 53. Hydraulic pump.

[0029] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] There are some problems with traditional hydraulic lifting systems. In a hydraulic lifting system where multiple cylinders work together, asynchronous lifting of the cylinders can cause the load to tilt or be unevenly distributed, which not only affects the lifting efficiency but may also cause damage to the equipment or create safety hazards.

[0034] The utility model provides a hydraulic lifting system for lifting objects on a lifting platform, wherein the lifting platform is provided with a lifting working surface.

[0035] See also Figure 1 In one embodiment of the present invention, the hydraulic lifting system 100 includes:

[0036] A plurality of hydraulic cylinders 1 are provided at intervals, and the hydraulic cylinders 1 are fixedly arranged on the side of the lifting platform away from the lifting working surface;

[0037] A hydraulic control unit 2 is fixedly mounted on a side of the hydraulic cylinder 1 facing away from the lifting platform. The hydraulic control unit 2 includes a plurality of proportional control valves 21, and the plurality of proportional control valves 21 are respectively connected to the hydraulic cylinder 1; and

[0038] The hydraulic auxiliary unit 3 includes an accumulator 31 and a safety valve group 32 . The safety valve group 32 is installed in the accumulator 31 , and the accumulator 31 is connected to the hydraulic control unit 2 .

[0039] In the technical solution of the present invention, multiple hydraulic cylinders 1 are spaced apart on the lifting platform to evenly distribute the supporting force. Each proportional control valve 21 in the hydraulic control unit 2 is individually connected to a single hydraulic cylinder 1. The use of proportional control valves 21 ensures precise control of the flow and pressure of each cylinder, thereby achieving synchronization of cylinder movements. A closed-loop control system monitors the position and pressure of the hydraulic cylinders 1 in real time, adjusting the opening of the proportional control valves 21 to compensate for differences between the hydraulic cylinders 1 and maintain synchronized movement. This solution improves the smoothness and efficiency of the lifting process and reduces uneven loads and equipment damage caused by asynchrony. The accumulator 31 in the hydraulic auxiliary unit 3 is connected to the hydraulic control unit 2. Installing the accumulator 31 effectively reduces pressure fluctuations caused by rapid movements or load changes, protects the system from hydraulic shock, and improves operational smoothness and safety. The safety valve assembly 32 provides an auxiliary power source for the hydraulic lifting system 100, protecting the various components within the system and increasing its service life.

[0040] In the embodiments of the present invention, please refer to Figure 2 The hydraulic control unit 2 also includes a relief valve 22, which is arranged at the rod chamber oil port of the hydraulic cylinder 1 and is connected to the proportional control valve 21. By reasonably setting the pressure setting value of the relief valve 22, it is possible to ensure that the system operates safely within the normal working pressure range and prevent overpressure. In addition, the relief valve 22 can also provide protection during the system startup and shutdown process to prevent damage to the system due to instantaneous pressure peaks. By installing three pressure protection devices, including the accumulator 31, the proportional control valve 21 and the relief valve 22, the reliability of the hydraulic lifting system 100 can be significantly improved.

[0041] In the embodiments of the present invention, please refer to Figure 2 The hydraulic control unit 2 also includes a solenoid reversing valve 23 and a hydraulically controlled check valve 24, which are connected to each other. The solenoid reversing valve 23 is used to adjust the flow direction of the oil circuit within the hydraulically controlled check valve 24. Adjusting the flow direction of the oil circuit within the hydraulically controlled check valve 24 through the solenoid reversing valve 23 makes the hydraulic system's oil circuit control more flexible, allowing the oil flow direction to be quickly changed according to lifting requirements. The hydraulically controlled check valve 24 prevents oil backflow, and combined with the solenoid reversing valve 23, it can effectively prevent system loss of control due to oil backflow.

[0042] In the embodiments of the present invention, please refer to Figure 2 The hydraulic control unit 2 has an oil inlet and an oil return line, and also includes a high-pressure filter 25, which connects the oil inlet and return lines. High-pressure filter 25 effectively filters impurities and contaminants from the oil inlet, ensuring high cleanliness of the oil entering the hydraulic system and reducing system failures caused by oil contamination. High-pressure filter 25 protects precision components in the hydraulic system, such as the hydraulic pump 53, valves, and hydraulic cylinder 1, thereby extending their service life.

[0043] In the embodiments of the present invention, please refer to Figure 1 and Figure 3 Two sets of hydraulic auxiliary units 3 are provided, and these two sets of hydraulic auxiliary units 3 are connected to the oil inlet and oil return lines respectively. This helps to balance the oil pressure at the oil inlet and oil return ports in the system, ensuring the stable operation of the hydraulic system even under complex working conditions. The addition of the accumulator 31 not only protects the hydraulic system from the impact of hydraulic shock, but also extends the service life of the components within the hydraulic system and improves the smoothness and safety of operation. In the event of a sudden power outage in the system motor 51, the accumulator 31 located at the oil inlet can act as an auxiliary power source, temporarily providing pressure to the system and ensuring that the hydraulic cylinder 1 does not suddenly fall.

[0044] In the embodiments of the present invention, please refer to Figure 1 and Figure 4 Hydraulic lifting system 100 also includes a hydraulic oil storage unit 4, which includes an oil tank 41. Oil tank 41 is divided into two oil circuits, each connected to accumulator 31 and hydraulic control unit 2. These two independent oil circuits, respectively, help maintain system pressure stability and reduce pressure fluctuations, thereby improving the stability of the hydraulic system. The dedicated oil circuit directly connected to accumulator 31 ensures rapid charging and discharging of accumulator 31, improving its response speed and efficiency.

[0045] In the embodiments of the present invention, please refer to Figure 4Hydraulic oil storage unit 4 also includes a return oil filter 42, which is located within oil tank 41 and filters the hydraulic oil within tank 41. This filter 42 effectively filters impurities and particles from the return oil, ensuring high cleanliness of the hydraulic oil within tank 41 and reducing oil contamination. Optionally, return oil filter 42 includes a filter element, a filter housing, and inlet and outlet pipes, all of which are connected to the interior of oil tank 41, facilitating inspection and cleaning during oil changes or system maintenance.

[0046] In the embodiments of the present invention, please refer to Figure 4 The hydraulic oil storage unit 4 also includes a liquid level detection device 43, which is located within the oil storage tank 41 to detect changes in the hydraulic oil level within the oil storage tank 41 in real time. The liquid level detection device 43 can monitor changes in the oil level within the oil storage tank 41 in real time, preventing insufficient oil suction due to a low oil level or oil overflow due to an excessively high oil level. This helps to replenish or remove excess oil in a timely manner, ensuring the safe and stable operation of the hydraulic system. The liquid level detection device 43 can also be connected to an alarm device to promptly issue an alarm when the oil level is abnormal, thereby avoiding equipment failure caused by oil level problems.

[0047] In the embodiments of the present invention, please refer to Figure 4 The hydraulic oil storage unit 4 further includes a heater 44, which is disposed in the oil storage tank 41 to heat the hydraulic oil in the oil storage tank 41. In a low temperature environment, the heater 44 can preheat the hydraulic oil to a normal operating temperature, thereby reducing the viscosity of the oil and improving the starting performance and response speed of the hydraulic system. In another embodiment of the present invention, please refer to Figure 4 The hydraulic oil storage unit 4 also includes a temperature detection device 45, which is located within the oil tank 41 and is used to monitor the temperature of the hydraulic oil within the oil tank 41 in real time, ensuring that the oil remains within the optimal operating temperature range. The temperature detection device 45 can be a thermometer inserted into the oil tank 41. Through real-time temperature monitoring, excessive oil temperatures can be detected and prevented, thereby avoiding system failures and component damage caused by overheating. Optionally, the hydraulic oil storage unit 4 also includes an air filter that can filter out dust, pollen, sand, and other suspended particles from the air entering the hydraulic cylinder 1, protecting the internal moving components.

[0048] In the embodiments of the present invention, please refer to Figure 1 and Figure 5The hydraulic lifting system 100 further includes a hydraulic power unit 5, which is connected to one side of the hydraulic control unit 2. The accumulator 31 and the hydraulic oil storage unit 4 are respectively connected to the hydraulic power unit 5. The hydraulic power unit 5 can provide the required hydraulic energy for the hydraulic lifting system 100, assisting the lifting platform in lifting and lowering, and ensuring that the hydraulic lifting system 100 can operate stably and efficiently when carrying heavy objects.

[0049] In the embodiments of the present invention, please refer to Figure 5 The hydraulic power unit 5 includes a motor 51, a coupling 52, and a hydraulic pump 53. The motor 51 and the hydraulic pump 53 are connected via the coupling 52, and the hydraulic pump 53 is connected to the oil tank 41 via a connecting pipe. The use of the coupling 52 simplifies the connection between the motor 51 and the hydraulic pump 53, facilitating installation and maintenance. The hydraulic pump 53 directly draws oil from the oil tank 41 and transmits it to the hydraulic cylinder 1, providing the hydraulic energy required for the hydraulic system's lifting operation.

[0050] In summary, after combining the above multiple implementation methods, the specific implementation process of this scheme is as follows: start the motor 51, the hydraulic pump 53 starts working, and the hydraulic oil is pumped out from the oil storage tank 41, and the hydraulic oil enters the hydraulic system along the hydraulic pipeline. When passing through the three-way joint, it is divided into two paths, one path enters the accumulator 31, and the other path enters the hydraulic control unit 2. By allowing the electromagnetic reversing valve 23 to be energized and reversed, the hydraulic control one-way valve 24 is controlled to reverse, and the hydraulic oil enters the proportional control valve 21 through the hydraulic control one-way valve 24. The right coil of the proportional control valve 21 is energized and reversed, and the hydraulic oil enters the rodless chamber of the hydraulic cylinder 1 and flows out from the rod chamber. It passes through the hydraulic control one-way valve 24 and the proportional control valve 21 in turn and returns to the oil storage tank 41, so that the hydraulic system can achieve the lifting action. When the hydraulic cylinder 1 moves to the upper limit position, it stops. At this time, the left coil of the proportional control valve 21 is energized and reversed. The hydraulic oil enters the rod chamber of the hydraulic cylinder 1 and flows out from the rodless chamber. It passes through the hydraulic control one-way valve 24 and the proportional control valve 21 in sequence and returns to the oil storage tank 41, so that the hydraulic system realizes the descending action. When the hydraulic cylinder 1 moves to the lower limit position, it stops.

[0051] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A hydraulic lifting system for lifting objects on a lifting platform, wherein the lifting platform is provided with a lifting working surface, characterized in that: The hydraulic lifting system comprises: A plurality of hydraulic cylinders are provided at intervals, and the hydraulic cylinders are fixedly arranged on a side of the lifting platform away from the lifting working surface; a hydraulic control unit, fixedly arranged on a side of the hydraulic cylinder away from the lifting platform, the hydraulic control unit comprising a plurality of proportional control valves, and the plurality of proportional control valves are respectively connected to the hydraulic cylinder; and The hydraulic auxiliary unit includes an accumulator and a safety valve group. The safety valve group is installed in the accumulator, and the accumulator is connected to the hydraulic control unit.

2. The hydraulic lifting system according to claim 1, characterized in that: The hydraulic control unit further includes a relief valve, which is arranged at the rod chamber oil port of the hydraulic cylinder and connected to the proportional control valve.

3. The hydraulic lifting system according to claim 2, characterized in that: The hydraulic control unit further includes an electromagnetic reversing valve and a hydraulically controlled one-way valve connected to each other, wherein the electromagnetic reversing valve is used to adjust the flow direction of the oil circuit in the hydraulically controlled one-way valve.

4. The hydraulic lifting system according to claim 3, characterized in that: The hydraulic control unit has an oil inlet passage and an oil return passage, and further includes a high-pressure filter. The high-pressure filter connects the oil inlet passage and the oil return passage.

5. The hydraulic lifting system according to claim 4, characterized in that: The hydraulic auxiliary units are provided in two groups, and the two groups of hydraulic auxiliary units are respectively communicated with the oil inlet circuit and the oil return circuit.

6. The hydraulic lifting system according to claim 1, wherein: The hydraulic lifting system further includes a hydraulic oil storage unit, which includes an oil storage tank. The oil storage tank is divided into two oil circuits, and the two oil circuits are respectively connected to the accumulator and the hydraulic control unit.

7. The hydraulic lifting system according to claim 6, characterized in that: The hydraulic oil storage unit further includes an oil return filter device, which is arranged in the oil storage tank to filter the hydraulic oil in the oil storage tank; and / or, The hydraulic oil storage unit further includes a liquid level detection device, which is disposed in the oil storage tank to detect changes in the liquid level of the hydraulic oil in the oil storage tank in real time.

8. The hydraulic lifting system according to claim 6, wherein: The hydraulic oil storage unit further includes a heater, which is disposed in the oil storage tank to heat the hydraulic oil in the oil storage tank; and / or, The hydraulic oil storage unit further includes a temperature detection device, which is disposed in the oil storage tank to detect the temperature of the hydraulic oil in the oil storage tank in real time.

9. The hydraulic lifting system according to any one of claims 6 to 8, characterized in that: The hydraulic lifting system further includes a hydraulic power unit, which is connected to one side of the hydraulic control unit, and the accumulator and the hydraulic oil storage unit are respectively connected to the hydraulic power unit.

10. The hydraulic lifting system according to claim 9, wherein: The hydraulic power unit includes a motor, a coupling and a hydraulic pump. The motor and the hydraulic pump are connected via the coupling, and the hydraulic pump is connected to the oil storage tank via a connecting pipe.

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