Oil cylinder lifting system and oil cylinder lifting control method

Abstract

The present invention provides a cylinder lifting system and a cylinder lifting control method, wherein the cylinder lifting system includes an oil tank, an electric proportional variable pump assembly, a first electromagnetic reversing valve, a balancing valve, a pilot control metering pump, an electric proportional pressure reducing valve, a lifting cylinder, a first pressure sensor and a second pressure sensor; the oil tank, the electric proportional variable pump assembly, the first electromagnetic reversing valve and the lifting cylinder are connected in sequence, and the balancing valve is connected to the lifting cylinder and the first electromagnetic reversing valve; the oil tank, the pilot control metering pump and the electric proportional pressure reducing valve are connected in sequence, and the electric proportional pressure reducing valve is connected to the pilot control port of the balancing valve; the first pressure sensor is suitable for being arranged at the connecting pipeline between the first electromagnetic reversing valve and the balancing valve, and the second pressure sensor is suitable for being arranged at the connecting pipeline between the lifting cylinder and the balancing valve. The beneficial effects of the present invention: the operation of the cylinder lifting system can be made more reasonable and stable.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic technology, and in particular to an oil cylinder lifting system and an oil cylinder lifting control method. Background Art

[0002] Cylinder lifting systems, such as offshore lifting platforms, are mainly used in offshore and mid-shore areas to install and repair oil facilities or wind power systems. They have high safety requirements, and stable and reliable control is a must. In daily lifting control, platform shaking or uneven speed often occurs when lowering at low speed and light load.

[0003] In order to enable the platform to rise and fall, an oil pressure-controlled reverse balancing valve is usually used. When the platform is raised or lowered, the control oil pressure of the system will change with the pressure of the platform's lifting cylinder. The change in oil pressure causes the opening of the reverse balancing valve to be unstable, which in turn causes the descent speed to be fast or slow, resulting in jitter. Summary of the invention

[0004] The problem solved by the invention is how to make the operation of the oil cylinder lifting system more reasonable and stable.

[0005] To solve the above problems, the present invention provides an oil cylinder lifting system, including an oil tank, an electric proportional variable pump assembly, a first electromagnetic reversing valve, a balancing valve, a pilot-controlled metering pump, an electric proportional pressure reducing valve, a lifting cylinder, a first pressure sensor and a second pressure sensor; the oil tank, the electric proportional variable pump assembly, the first electromagnetic reversing valve and the lifting cylinder are connected in sequence, and the balancing valve is connected to the lifting cylinder and the first electromagnetic reversing valve; the oil tank, the pilot-controlled metering pump and the electric proportional pressure reducing valve are connected in sequence, and the electric proportional pressure reducing valve is connected to the pilot control port of the balancing valve; the first pressure sensor is suitable for being arranged in the connecting pipeline between the first electromagnetic reversing valve and the balancing valve, and the second pressure sensor is suitable for being arranged in the connecting pipeline between the lifting cylinder and the balancing valve.

[0006] In the present technical solution, the pressure value of the hydraulic oil in the pipeline between the first solenoid reversing valve and the balancing valve and the pressure value of the hydraulic oil in the pipeline between the lifting cylinder and the balancing valve can be detected by the first pressure sensor and the second pressure sensor. Based on this, the extension and retraction operation of the lifting cylinder can be accurately determined, so that the electric proportional displacement control valve of the electric proportional variable pump assembly can be more conveniently controlled to ensure the smooth extension or retraction of the lifting cylinder, thereby ensuring the corresponding smooth lifting and lowering of the platform to avoid shaking. Alternatively, based on the comparison of the two pressure values, the electric proportional pressure reducing valve can be more conveniently controlled to increase the extension or retraction speed of the lifting cylinder, thereby avoiding operating difficulties of the platform. Accordingly, the operating speed of the platform can also be slowed down, so that the operation of the platform can be reasonably regulated.

[0007] Further, the first electromagnetic reversing valve includes a first working port and a second working port, the balancing valve includes a first balancing valve and a second balancing valve, the first balancing valve is connected to the first working port and the rodless chamber oil port of the lifting cylinder, and the second balancing valve is connected to the second working port and the rod chamber oil port of the lifting cylinder.

[0008] Furthermore, it also includes a first pressure reducing valve and a first overflow valve, the pilot-controlled metering pump, the first pressure reducing valve and the rod chamber oil port are connected in sequence, and the pilot-controlled metering pump, the first pressure reducing valve, the first overflow valve and the oil tank are connected in sequence.

[0009] Furthermore, it also includes a throttle valve and a switch valve, the rodless chamber oil port, the throttle valve, the switch valve and the rod chamber oil port are connected in sequence, and the pipeline between the rod chamber oil port and the switch valve, the first overflow valve and the oil tank are connected in sequence.

[0010] Furthermore, it also includes a pilot-controlled emergency accumulator, a second electromagnetic reversing valve, a third electromagnetic reversing valve and a second overflow valve. The pipeline between the pilot-controlled metering pump and the electric proportional pressure reducing valve, the second electromagnetic reversing valve and the pilot-controlled emergency accumulator are connected in sequence; the pilot-controlled metering pump, the third electromagnetic reversing valve, the second overflow valve and the oil tank are connected in sequence; the pilot-controlled emergency accumulator is suitable for being connected to the oil tank.

[0011] Furthermore, it also includes a third overflow valve and a fourth electromagnetic reversing valve connected to the third overflow valve, and the pipeline between the pilot-controlled quantitative pump and the electric proportional pressure reducing valve, the third overflow valve and the oil tank are connected in sequence.

[0012] Furthermore, it also includes a latch cylinder oil supply metering pump, a fifth electromagnetic reversing valve and a latch cylinder. The oil tank, the latch cylinder oil supply metering pump, the fifth electromagnetic reversing valve and the latch cylinder are connected in sequence, and the oil return port of the fifth electromagnetic reversing valve is connected to the oil tank.

[0013] Furthermore, it also includes a latch emergency oil supply accumulator, the pipeline between the fifth electromagnetic reversing valve and the latch oil cylinder oil supply metering pump is connected to the latch emergency oil supply accumulator, and the latch emergency oil supply accumulator is suitable for connecting with the oil tank.

[0014] Furthermore, it also includes a fourth overflow valve and a sixth electromagnetic reversing valve connected to the fourth overflow valve, and the pipeline between the latch cylinder oil supply metering pump and the fifth electromagnetic reversing valve, the fourth overflow valve and the oil tank are connected in sequence.

[0015] The present invention also proposes a method for controlling the lifting of an oil cylinder, which includes:

[0016] Control the electric proportional pressure reducing valve to output control oil to the pilot control port of the balancing valve, so that the hydraulic oil flowing out of the jacking cylinder passes through the balancing valve to the first pressure sensor;

[0017] Acquire a first pressure detected by the first pressure sensor and a second pressure detected by the second pressure sensor;

[0018] The displacement of the electric proportional variable pump assembly is controlled according to the comparison between the first pressure and the second pressure, and / or the opening of the electric proportional pressure reducing valve is controlled.

[0019] In this technical solution, the pressure at both ends of the balance valve is detected, and then the cylinder lifting system is controlled according to the pressure comparison, so that the operation of the jacking cylinder in the cylinder lifting system is more reasonable and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural principle block diagram of the oil cylinder lifting system in an embodiment of the present invention;

[0021] Figure 2 1 is an electrical schematic diagram of the oil cylinder lifting system in an embodiment of the present invention.

[0022] Description of reference numerals:

[0023] 1-Oil tank; 2-Electric proportional variable pump assembly; 3-First solenoid reversing valve; 4-Balance valve; 5-Pilot control metering pump; 6-Electric proportional pressure reducing valve; 7-Lifting cylinder; 8-Oil return line; 9-First pressure reducing valve; 10-First relief valve; 11-Throttle valve; 12-Switch valve; 13-Pilot control emergency accumulator; 14-Second solenoid reversing valve; 15-Third solenoid reversing valve; 16-Second relief valve; 19-Third relief valve; 20-Fourth solenoid reversing valve; 21-Latch cylinder oil supply metering pump; 22-Fifth solenoid reversing valve; 23-Latch cylinder; 24-Latch emergency oil supply accumulator; 25-Fourth overflow Flow valve; 26-sixth solenoid reversing valve; 27-first pressure sensor; 28-second pressure sensor; 29-oil drain pipeline; 201-electric proportional variable pump; 202-electric proportional displacement control valve; 401-first balancing valve; 402-second balancing valve; 601-first electric proportional pressure reducing valve; 602-second electric proportional pressure reducing valve; 701-rodless chamber oil port; 702-rod chamber oil port; 2301-first latch cylinder; 2302-second latch cylinder; 2701-first outlet sensor; 2702-second outlet sensor; 2801-first inlet sensor; 2802-second inlet sensor. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0026] Reference Figure 1 and 2As shown, the present invention proposes a cylinder lifting system, including an oil tank 1, an electric proportional variable pump assembly 2, a first electromagnetic reversing valve 3, a balancing valve 4, a pilot-controlled quantitative pump 5, an electric proportional pressure reducing valve 6, a lifting cylinder 7, a first pressure sensor 27 and a second pressure sensor 28; the oil tank 1, the electric proportional variable pump assembly 2, the first electromagnetic reversing valve 3 and the lifting cylinder 7 are connected in sequence, and the balancing valve 4 is connected to the lifting cylinder 7 and the first electromagnetic reversing valve 3; the oil tank 1, the pilot-controlled quantitative pump 5 and the electric proportional pressure reducing valve 6 are connected in sequence, and the electric proportional pressure reducing valve 6 is connected to the pilot control port of the balancing valve 4; the first pressure sensor 27 is suitable for being arranged at the connecting pipeline between the first electromagnetic reversing valve 3 and the balancing valve 4, and the second pressure sensor 28 is suitable for being arranged at the connecting pipeline between the lifting cylinder 7 and the balancing valve 4.

[0027] In the relevant hydraulic cylinder lifting system, in order to enable the lifting system platform to rise and fall, an oil pressure-controlled reverse balancing valve is usually used to achieve this. When the platform is raised or lowered, the system's control oil pressure will change with the pressure of the platform's lifting cylinder. The change in oil pressure causes the opening of the reverse balancing valve to be unstable, which in turn causes the descent speed to be fast or slow, resulting in jitter.

[0028] In the embodiment of the present invention, the oil tank 1 of the oil cylinder lifting system is connected to the electric proportional variable pump assembly 2 to output the hydraulic oil for controlling the lifting of the jacking oil cylinder 7. Figure 1 and 2 The electric proportional variable pump assembly 2 may include an electric proportional variable pump assembly 2 and an electric proportional displacement control valve 202 connected to the electric proportional variable pump 201. The electric proportional displacement control valve 202 is used to control the displacement of the electric proportional variable pump 201, wherein the electric proportional displacement control valve 202 may be provided with an electromagnetic coil, so that communication control can be performed. In this embodiment, the hydraulic oil output by the electric proportional variable pump assembly 2 may pass through a one-way valve, a filter, and a first electromagnetic reversing valve 3 in sequence, and then flow into the lifting cylinder 7. A one-way valve is provided to avoid backflow of the hydraulic oil, and a filter is provided to filter the hydraulic oil.

[0029] Among them, a balancing valve 4 is provided, which is connected to the first electromagnetic reversing valve 3 and the lifting cylinder 7 to balance the hydraulic oil pressure difference. Figure 1 In an optional embodiment of the present embodiment, the first electromagnetic reversing valve 3, the balancing valve 4 and the lifting cylinder 7 are sequentially connected, so that the hydraulic oil can flow into the lifting cylinder 7 through the first electromagnetic reversing valve 3 and the balancing valve 4 in sequence, or the hydraulic oil flowing out of the lifting cylinder 7 can flow to the first electromagnetic reversing valve 3 through the regulated balancing valve 4, or, refer to Figure 2In another embodiment, a one-way pipeline is included, on which a one-way valve is provided, and the first solenoid reversing valve 3 is connected to the lifting cylinder 7 through the one-way pipeline so that the hydraulic oil can flow from the first solenoid reversing valve 3 into the lifting cylinder 7. The balancing valve 4 is connected in parallel with the one-way pipeline and is connected to the first solenoid reversing valve 3 and the lifting cylinder 7, so that the hydraulic oil flowing out of the lifting cylinder 7 can flow to the first solenoid reversing valve 3 through the regulated balancing valve 4.

[0030] The oil cylinder lifting system also includes a pilot control metering pump 5, which is connected to the oil tank 1 for pilot control. The hydraulic oil output by the pilot control metering pump 5 passes through the one-way valve, the filter and the electric proportional pressure reducing valve 6 in sequence, and the electric proportional pressure reducing valve 6 finally outputs the proportional control oil to the pilot control port of the balance valve 4. Figure 2 The balancing valve 4 usually has multiple oil ports. In this embodiment, it has two oil ports for hydraulic oil communication and the pilot control port. When the hydraulic oil flows into the pilot control port, the balancing valve 4 is controlled. Based on the control of the pilot control port, the flow of hydraulic oil in the other two oil ports of the balancing valve is controlled. In this embodiment, when the balancing valve 4 is controlled, the hydraulic control oil after proportional adjustment is output through the electric proportional pressure reducing valve 6 to make the balancing valve 4 have a proportional opening, so that the hydraulic oil flowing out of the lifting cylinder 7 can be reversely circulated through the balancing valve 4 with the proportional opening.

[0031] The cylinder lifting system includes a first pressure sensor 27 and a second pressure sensor 28, so that the pressure value of the hydraulic oil in the pipeline between the first electromagnetic reversing valve 3 and the balancing valve 4 and the pressure value of the hydraulic oil in the pipeline between the jacking cylinder 7 and the balancing valve 4 can be detected through the first pressure sensor 27 and the second pressure sensor 28, that is, the pressure values ​​of the two hydraulic oil ports of the balancing valve 4 are detected in real time. Based on this, the telescopic operation status of the jacking cylinder 7 can be accurately determined. It can be understood that when comparing the two pressure values, if the difference between the two does not change much, the jacking cylinder 7 is more stable and has less jitter. If the difference between the two is small, the telescopic speed of the jacking cylinder 7 is faster. Accordingly, Based on the comparison between the two pressure values, the electric proportional displacement control valve 202 of the electric proportional variable pump assembly 2 can be more conveniently controlled to ensure the smooth extension or retraction of the jacking cylinder 7, thereby ensuring the corresponding smooth lifting and lowering of the platform to avoid shaking. Alternatively, based on the comparison between the two pressure values, the electric proportional pressure reducing valve 6 can be more conveniently controlled. For example, when the difference between the two pressure values ​​is large, the pressure value of the hydraulic oil output by the electric proportional pressure reducing valve 6 is reduced, and the opening pilot pressure of the balance valve 4 is increased, thereby achieving an increase in the extension or retraction speed of the jacking cylinder 7, thereby avoiding operating difficulties of the platform. Accordingly, the operating speed of the platform can also be slowed down, so that the operation of the platform can be reasonably regulated.

[0032] Wherein, switch valves are provided on the oil circuits where the first pressure sensor 27 and the second pressure sensor 28 are located to control the on or off of the pressure sensors so as to detect the pressure at an appropriate time.

[0033] In this embodiment, the first electromagnetic reversing valve 3 can be selected as a three-position four-way electromagnetic reversing valve, which is provided with an electromagnetic coil to control the output of the hydraulic oil, wherein the first electromagnetic reversing valve 3 includes a first working port and a second working port, that is, Figure 2 The a port and the b port of the first electromagnetic reversing valve 3, in this embodiment, when the lifting cylinder 7 needs to perform an extension or retraction action, hydraulic oil needs to be input to the rod chamber or the rodless chamber of the lifting cylinder 7, and the working port refers to the oil port corresponding to the input of hydraulic oil to the rod chamber and the rodless chamber, respectively. By controlling the first electromagnetic reversing valve 3, the oil output of the first working port or the second working port is realized, so as to finally realize the control of the rod chamber or the rodless chamber. For example, hydraulic oil is output to the rodless chamber oil port 701 through the first working port, so that hydraulic oil is introduced into the rodless chamber to control the extension of the piston rod. At the same time, the rod chamber discharges oil through the rod chamber oil port 702, and the hydraulic oil flows to the second working port. Finally, the hydraulic oil is introduced into the oil tank 1 through the return oil port of the first electromagnetic reversing valve 3, so as to realize the circulation of hydraulic oil in the entire oil circuit. The balancing valve 4 includes The first balancing valve 401 and the second balancing valve 402 are included. The first balancing valve 401 is connected to the first working port and the rodless chamber oil port 701 of the jacking oil cylinder 7. The second balancing valve 402 is connected to the second working port and the rod chamber oil port 702 of the jacking oil cylinder 7. In this way, the first solenoid reversing valve 3 adjusts the opening and closing of the first working port and the second working port, and correspondingly controls the hydraulic oil conduction of the rodless chamber oil port 701 and the rod chamber oil port 702 of the jacking oil cylinder 7, that is, the extension and retraction of the jacking oil cylinder 7 are controlled respectively. When the rodless chamber oil port 701 is connected, hydraulic oil is introduced into the rodless chamber, and there is no piston rod in the rodless chamber. At this time, the piston rod is extended. When the rod chamber oil port 702 is connected, hydraulic oil is introduced into the rod chamber. The rod chamber is a cavity with a piston rod. At this time, the piston rod is retracted. Figure 2 One-way pipelines can be set up respectively to conduct the first working port and the second working port to the rodless chamber oil port 701 and the rod chamber oil port 702, wherein the first balancing valve 401 and the second balancing valve 402 are respectively connected in parallel with the corresponding one-way pipelines to conduct the working ports of the jacking cylinder 7 and the first solenoid reversing valve 3, thereby realizing the individual control of the smooth extension and retraction of the jacking cylinder 7.

[0034] Correspondingly, the first pressure sensor 27 includes a first outlet sensor 2701 and a second outlet sensor 2702, and the second pressure sensor 28 includes a first inlet sensor 2801 and a second inlet sensor 2802, so that the first outlet sensor 2701 and the first inlet sensor 2801 respectively detect the pressure values ​​at both ends of the first balancing valve 401, and the second outlet sensor 2702 and the second inlet sensor 2802 respectively detect the pressure values ​​at both ends of the second balancing valve 402, so that the electric proportional displacement control valve 202 of the electric proportional variable pump assembly 2 can be controlled when the lifting cylinder 7 is extended or retracted, so as to make the extension and retraction of the lifting cylinder 7 smoother.

[0035] In one embodiment, referring to Figure 1 and Figure 2 Corresponding to the first balancing valve 401 and the second balancing valve 402, the electric proportional pressure reducing valve 6 may include a first electric proportional pressure reducing valve 601 and a second electric proportional pressure reducing valve 602. At this time, the pilot control ports of the pilot-controlled metering pump 5, the first electric proportional pressure reducing valve 601 and the first balancing valve 401 are connected in sequence, and the pilot control ports of the pilot-controlled metering pump 5, the second electric proportional pressure reducing valve 602 and the second balancing valve 402 are connected in sequence, so as to control the first balancing valve 401 and the second balancing valve 402 respectively, that is, when controlling the lifting cylinder 7 to retract, the first electric proportional pressure reducing valve 601 outputs proportional control oil to the first balancing valve 401 to achieve proportional opening, and when controlling the lifting cylinder 7 to extend, the second electric proportional pressure reducing valve 602 outputs proportional control oil to the second balancing valve 402 to achieve proportional opening.

[0036] The oil return port of the first electromagnetic reversing valve 3, i.e. Figure 2 The t port in it can be connected to the oil tank 1, so as to realize the discharge function of excess hydraulic oil, thereby avoiding damage to the internal seal of the cylinder, wherein the corresponding first balancing valve 401 is connected with the rodless chamber oil port 701 of the jacking cylinder 7 and the first working port of the first solenoid reversing valve 3, and the second balancing valve 402 is connected with the rod chamber oil port 702 of the jacking cylinder 7 and the second working port of the first solenoid reversing valve 3. The hydraulic oil flowing out of the jacking cylinder 7 can flow to the two working ports of the first solenoid reversing valve 3 through the first balancing valve 401 and the second balancing valve 402 respectively, and then flow back to the oil tank 1 through the return oil port t of the first solenoid reversing valve 3.

[0037] In this embodiment, the cylinder lifting system includes an oil return pipeline 8, which is used to provide return oil connection for various components in the system, so as to guide the return oil of the hydraulic oil into the oil tank 1 for circulation, wherein a filter can be provided on the oil return pipeline 8 to filter the hydraulic oil, a cooler can be provided to cool the return hydraulic oil, and a one-way valve can be provided to form a one-way conduction of the oil return pipeline 8.

[0038] The oil return port t of the first electromagnetic reversing valve 3 is connected to the oil return pipeline 8 through a pipeline.

[0039] In an optional embodiment of the present invention, it also includes a first pressure reducing valve 9 and a first overflow valve 10, the pilot-controlled metering pump 5, the first pressure reducing valve 9 and the rod chamber oil port 702 are connected in sequence, and the pilot-controlled metering pump 5, the first pressure reducing valve 9, the first overflow valve 10 and the oil tank 1 are connected in sequence.

[0040] Reference Figure 2 As shown, in this embodiment, the pilot-controlled metering pump 5, the first pressure reducing valve 9 and the rod chamber oil port 702 are connected in sequence, based on the connection between the pilot-controlled metering pump 5 and the oil tank 1, so that the hydraulic oil in the oil tank 1 can pass through the pilot-controlled metering pump 5 and the first pressure reducing valve 9 in sequence, and then flow to the rod chamber oil port 702 of the jacking cylinder 7, and a one-way valve can be set on the pipeline between the first pressure reducing valve 9 and the rod chamber oil port 702 to achieve one-way conduction to prevent the oil in the rod chamber oil port 702 from flowing back to the first pressure reducing valve 9; and the pilot-controlled metering pump 5, the first pressure reducing valve 9, the first overflow valve 10 and the oil tank 1 are connected in sequence, so that the hydraulic oil output from the pilot-controlled metering pump 5 can flow back to the oil tank 1 through the first pressure reducing valve 9 and the first overflow valve 10. Specifically, the first overflow valve 10 is connected to the return oil pipeline 8 through a pipeline for oil return.

[0041] After the lifting system has been stationary for a long time, air will be precipitated from the oil in the rod chamber of the jacking cylinder 7 due to gravity, causing the internal liquid level to drop. The precipitated air will cause corrosion to the inner wall of the cylinder. At the same time, due to the presence of oil inside the cylinder, the oil pressure changes during the operation of the cylinder, causing a certain degree of cavitation on the inner wall of the cylinder.

[0042] In this embodiment, the pilot-controlled metering pump 5 outputs the hydraulic oil to the first pressure-reducing valve 9. A portion of the hydraulic oil flowing out of the first pressure-reducing valve 9 can flow to the first overflow valve 10, and then flow back to the oil tank through the return oil pipeline 8. The other portion of the hydraulic oil flowing out of the first pressure-reducing valve 9 flows to the rod chamber oil port 702 for oil replenishment. Due to the action of the first overflow valve 10, the hydraulic oil replenishing the rod chamber oil port 702 has a certain pressure, so that the rod chamber of the jacking cylinder 7 can be pressure-exhausted, thereby avoiding the main pressure-bearing chamber of the jacking cylinder 7 from being pressurized, thereby enabling the jacking cylinder 7 to operate smoothly, that is, the platform can be lifted and lowered smoothly and safely.

[0043] In an optional embodiment of the present invention, it also includes a throttle valve 11 and a switch valve 12, the rodless chamber oil port 701, the throttle valve 11, the switch valve 12 and the rod chamber oil port 702 are connected in sequence, and the pipeline between the rod chamber oil port 702 and the switch valve 12, the first overflow valve 10 and the oil tank 1 are connected in sequence.

[0044] In the related art, a system power outage may occur without a backup power supply, making it impossible to perform emergency control on the jacking cylinder 7, making it difficult to perform an emergency lowering operation of the platform and a corresponding emergency oil return operation.

[0045] In this embodiment, the rodless chamber oil port 701, the throttle valve 11, the switch valve 12 and the rod chamber oil port 702 are connected in sequence through pipelines so as to be suitable for mutual communication. The opening or closing of the switch valve 12 ensures whether the rodless chamber oil port 701 and the rod chamber oil port 702 are connected. Under normal circumstances, the switch valve 12 disconnects the flow path. When the power is off or there is no backup power supply, the rodless chamber oil port 701 and the rod chamber oil port 702 are connected by controlling the switch valve 12, so that a part of the hydraulic oil flowing out of the rodless chamber oil port 701 flows to the rod chamber oil port 702 to replenish the oil in the rod chamber, and the other part of the hydraulic oil flows to the first overflow valve 10 and flows back to the oil tank 1 through the return oil pipeline 8 to enable oil return, thereby completing the emergency lowering of the jacking cylinder 7, wherein the throttle valve 11 is used to adjust the flow rate of the hydraulic oil, thereby adjusting the downward speed of the emergency lowering, so that the speed of the emergency lowering is more reasonable.

[0046] In an optional embodiment of the present invention, it also includes a pilot-controlled emergency accumulator 13, a second electromagnetic reversing valve 14, a third electromagnetic reversing valve 15 and a second overflow valve 16. The pipeline between the pilot-controlled metering pump 5 and the electric proportional pressure reducing valve 6, the second electromagnetic reversing valve 14 and the pilot-controlled emergency accumulator 13 are connected in sequence; the pilot-controlled metering pump 5, the third electromagnetic reversing valve 15, the second overflow valve 16 and the oil tank 1 are connected in sequence; the pilot-controlled emergency accumulator 13 is suitable for being connected to the oil tank 1.

[0047] In this embodiment, a pilot-controlled emergency accumulator 13 is provided for energy storage and can provide an oil source in an emergency, wherein the pipeline between the pilot-controlled metering pump 5 and the electric proportional pressure reducing valve 6, the second electromagnetic reversing valve 14 and the pilot-controlled emergency accumulator 13 are connected in sequence, so that the hydraulic oil flowing out of the pilot-controlled metering pump 5 can flow through the second electromagnetic reversing valve 14 to the pilot-controlled emergency accumulator 13 for filling and energy storage. After the filling and energy storage are completed, the hydraulic oil of the pilot-controlled metering pump 5 can flow back to the oil tank 1 through the third electromagnetic reversing valve 15, the second overflow valve 16 and the return oil pipeline 8 in sequence, and the pilot-controlled emergency accumulator 13 can be connected to the oil tank 1, so that the hydraulic oil of the pilot-controlled emergency accumulator 13 can flow back to the oil tank 1. Specifically, a switch valve is provided on the pipeline between the pilot-controlled emergency accumulator 13 and the return oil pipeline 8, and the return oil of the pilot-controlled emergency accumulator 13 is controlled by opening and closing the switch valve.

[0048] In an optional embodiment of the present invention, it also includes a third overflow valve 19 and a fourth electromagnetic reversing valve 20 connected to the third overflow valve 19, and the pipeline between the pilot-controlled metering pump 5 and the electric proportional pressure reducing valve 6, the third overflow valve 19 and the oil tank 1 are connected in sequence.

[0049] In this embodiment, the pipeline between the pilot-controlled metering pump 5 and the electric proportional pressure reducing valve 6 is connected to the third overflow valve 19, and the third overflow valve 19 is connected to the fourth electromagnetic reversing valve 20, so that by controlling the fourth electromagnetic reversing valve 20, the third overflow valve 19 can be controlled to achieve the external output of the hydraulic oil of the pilot-controlled metering pump 5, wherein the pipeline between the pilot-controlled metering pump 5 and the electric proportional pressure reducing valve 6, the third overflow valve 19 and the oil tank 1 are connected in sequence. Specifically, the pipeline between the pilot-controlled metering pump 5 and the electric proportional pressure reducing valve 6, the third overflow valve 19, the return oil pipeline 8 and the oil tank 1 are connected in sequence, so as to facilitate the return of oil of the pilot-controlled metering pump 5 after the work is completed.

[0050] The fourth electromagnetic reversing valve 20 may be a pilot electromagnetic reversing valve.

[0051] In an optional embodiment of the present invention, it also includes a latch cylinder oil supply metering pump 21, a fifth electromagnetic reversing valve 22 and a latch cylinder 23. The oil tank 1, the latch cylinder oil supply metering pump 21, the fifth electromagnetic reversing valve 22 and the latch cylinder 23 are connected in sequence, and the oil return port of the fifth electromagnetic reversing valve 22 is connected to the oil tank 1.

[0052] In this embodiment, the latch cylinder 23 includes a first latch cylinder 2301 and a second latch cylinder 2302, and the fifth solenoid reversing valve 22 corresponds to the first latch cylinder 2301 and the second latch cylinder 2302. In this embodiment, a two-position four-way solenoid reversing valve is used, so that the hydraulic oil output by the latch cylinder oil supply metering pump 21 passes through the fifth solenoid reversing valve 22 and flows to the first latch cylinder 2301 or the second latch cylinder 2302 to control the latch cylinder, such as realizing the removal of the dynamic ring beam latch.

[0053] In an optional embodiment of the present invention, it also includes a latch emergency oil supply accumulator 24, the pipeline between the fifth electromagnetic reversing valve 22 and the latch cylinder oil supply metering pump 21 is connected to the latch emergency oil supply accumulator 24, and the latch emergency oil supply accumulator 24 is suitable for connecting to the oil tank 1.

[0054] In this embodiment, a latch emergency oil supply accumulator 24 is provided for storing energy and providing an oil source in an emergency, wherein the hydraulic oil flowing out of the latch cylinder oil supply metering pump 21 can flow to the latch emergency oil supply accumulator 24, wherein a switch valve can be provided in the pipeline between the latch cylinder oil supply metering pump 21 and the latch emergency oil supply accumulator 24 to control energy storage, and the switch valve can be connected to the return oil pipeline 8 through a pipeline to control the return oil of the latch emergency oil supply accumulator 24.

[0055] In an optional embodiment of the present invention, it also includes a fourth overflow valve 25 and a sixth electromagnetic reversing valve 26 connected to the fourth overflow valve 25, and the pipeline between the latch cylinder oil supply metering pump 21 and the fifth electromagnetic reversing valve 22, the fourth overflow valve 25 and the oil tank 1 are connected in sequence.

[0056] In this embodiment, by controlling the sixth electromagnetic reversing valve 26, the fourth overflow valve 25 can be controlled to realize the outward output of the hydraulic oil of the latch cylinder oil supply metering pump 21, wherein the pipeline between the latch cylinder oil supply metering pump 21 and the fifth electromagnetic reversing valve 22, the fourth overflow valve 25 and the oil tank 1 are connected in sequence, thereby facilitating the return of oil to the latch cylinder oil supply metering pump 21 after the work is completed.

[0057] The sixth electromagnetic reversing valve 26 may be a pilot electromagnetic reversing valve.

[0058] In an optional embodiment of the present invention, the oil cylinder lifting system further comprises an oil drain line 29, and the oil drain line 29 is connected to the oil tank 1 for handling oil leakage of hydraulic oil in system components.

[0059] Specifically, the oil leakage pipeline 29 is connected to the fourth electromagnetic reversing valve 20, the sixth electromagnetic reversing valve 26, and the electric proportional pressure reducing valve 6 through pipelines, so as to facilitate the processing of the leaked oil so that the leaked oil can be gathered and flow to the oil tank.

[0060] In an optional embodiment of the present invention, it also includes a liquid level sensor, a heater, a liquid level gauge, an air filter and an oil drain switch, wherein the liquid level sensor is used to detect the liquid level of the hydraulic oil in the oil tank 1 and send a corresponding liquid level signal, the heater is used to heat the hydraulic oil in the oil tank 1, the air filter is used to filter the air entering the oil tank 1, the oil drain switch is used to export the hydraulic oil in the oil tank 1, and the liquid level gauge is used to indicate the liquid level of the hydraulic oil in the oil tank 1.

[0061] The present invention also proposes a method for controlling the lifting of an oil cylinder, which includes:

[0062] Control the electric proportional pressure reducing valve 6 to output the control oil to the pilot control port of the balance valve 4, so that the hydraulic oil flowing out of the jacking cylinder 7 passes through the balance valve 4 to the first pressure sensor 27;

[0063] Acquire a first pressure detected by the first pressure sensor 27 and a second pressure detected by the second pressure sensor 28;

[0064] The displacement of the electric proportional variable pump assembly 2 is controlled according to the comparison between the first pressure and the second pressure, and / or the opening of the electric proportional pressure reducing valve 6 is controlled.

[0065] In this embodiment, based on the above-mentioned cylinder lifting system, corresponding lifting control is performed. Specifically, after the system is started, the electric proportional pressure reducing valve 6 is controlled to proportionally adjust the hydraulic oil, and output the proportional control oil to the pilot control port of the balancing valve 4 to control the balancing valve 4, such as realizing a proportional opening of the balancing valve 4, so that the hydraulic oil flowing out of the lifting cylinder 7 can pass through the balancing valve 4, so that the first pressure sensor 27 and the second pressure sensor 28 can detect the pressure at both ends of the balancing valve 4, wherein the first pressure sensor 27 detects the first pressure, and the second pressure sensor 28 detects the second pressure.

[0066] Normally, the comparison between the first pressure and the second pressure reflects the telescopic operation of the lifting cylinder 7. If the two pressures have a certain difference, but the difference does not change much within a certain period of time, the extension and contraction of the lifting cylinder 7 will be smoother and the vibration will be smaller. Otherwise, the vibration will be too large. At this time, the electric proportional variable pump assembly 2 is controlled to adjust the displacement of the electric proportional variable pump 201 in the electric proportional variable pump assembly 2, so that the difference between the first pressure and the second pressure tends to be stable, thereby making the operation of the lifting cylinder 7 more stable.

[0067] In addition, if the difference between the first pressure and the second pressure is large, that is, the extension and retraction speed of the jacking cylinder 7 is slower, at this time, the electric proportional pressure reducing valve 6 can be controlled to reduce the pressure value of the hydraulic oil output by the electric proportional pressure reducing valve 6, and increase the opening pilot pressure of the balance valve 4, so as to achieve an increase in the extension or retraction speed of the jacking cylinder 7, thereby avoiding operating difficulties of the platform. Correspondingly, the operating speed of the platform can also be slowed down, so that the operation of the platform can be reasonably regulated.

[0068] Although the disclosure is disclosed as above, the protection scope of the disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A cylinder lifting system, characterized in that: The invention comprises an oil tank (1), an electric proportional variable pump assembly (2), a first electromagnetic reversing valve (3), a balancing valve (4), a pilot-controlled quantitative pump (5), an electric proportional pressure reducing valve (6), a lifting cylinder (7), a first pressure sensor (27) and a second pressure sensor (28); the oil tank (1), the electric proportional variable pump assembly (2), the first electromagnetic reversing valve (3) and the lifting cylinder (7) are connected in sequence, and the balancing valve (4) is connected to the lifting cylinder (7) and the first electromagnetic reversing valve (3); the oil tank (1), the pilot-controlled quantitative pump (5) and the electric proportional pressure reducing valve (6) are connected in sequence, and the electric proportional pressure reducing valve (6) is connected to the pilot control port of the balancing valve (4); the first pressure sensor (27) is arranged at the connecting pipeline between the first electromagnetic reversing valve (3) and the balancing valve (4), and the second pressure sensor (28) is arranged at the connecting pipeline between the lifting cylinder (7) and the balancing valve (4).

2. The oil cylinder lifting system according to claim 1, characterized in that: The first electromagnetic reversing valve (3) includes a first working port and a second working port, and the balancing valve (4) includes a first balancing valve (401) and a second balancing valve (402). The first balancing valve (401) is connected to the first working port and the rodless chamber oil port (701) of the lifting cylinder (7), and the second balancing valve (402) is connected to the second working port and the rod chamber oil port (702) of the lifting cylinder (7).

3. The oil cylinder lifting system according to claim 2, characterized in that: It also includes a first pressure reducing valve (9) and a first overflow valve (10); the pilot controlled metering pump (5), the first pressure reducing valve (9) and the rod chamber oil port (702) are connected in sequence, and the pilot controlled metering pump (5), the first pressure reducing valve (9), the first overflow valve (10) and the oil tank (1) are connected in sequence.

4. The oil cylinder lifting system according to claim 3, characterized in that: It also includes a throttle valve (11) and a switch valve (12); the rodless chamber oil port (701), the throttle valve (11), the switch valve (12) and the rod chamber oil port (702) are connected in sequence; and the pipeline between the rod chamber oil port (702) and the switch valve (12), the first overflow valve (10) and the oil tank (1) are connected in sequence.

5. The oil cylinder lifting system according to any one of claims 1 to 4, characterized in that: The invention also comprises a pilot-controlled emergency accumulator (13), a second electromagnetic reversing valve (14), a third electromagnetic reversing valve (15) and a second overflow valve (16); the pipeline between the pilot-controlled metering pump (5) and the electric proportional pressure reducing valve (6), the second electromagnetic reversing valve (14) and the pilot-controlled emergency accumulator (13) are connected in sequence; the pilot-controlled metering pump (5), the third electromagnetic reversing valve (15), the second overflow valve (16) and the oil tank (1) are connected in sequence; and the pilot-controlled emergency accumulator (13) is connected to the oil tank (1).

6. The oil cylinder lifting system according to any one of claims 1 to 4, characterized in that: It also includes a third overflow valve (19) and a fourth electromagnetic reversing valve (20) connected to the third overflow valve (19), and the pipeline between the pilot-controlled quantitative pump (5) and the electric proportional pressure reducing valve (6), the third overflow valve (19) and the oil tank (1) are connected in sequence.

7. The oil cylinder lifting system according to any one of claims 1 to 4, characterized in that: It also comprises a latch cylinder oil supply metering pump (21), a fifth electromagnetic reversing valve (22) and a latch cylinder (23); the oil tank (1), the latch cylinder oil supply metering pump (21), the fifth electromagnetic reversing valve (22) and the latch cylinder (23) are connected in sequence; and the oil return port of the fifth electromagnetic reversing valve (22) is connected to the oil tank (1).

8. The oil cylinder lifting system according to claim 7, characterized in that: It also includes a latch emergency oil supply accumulator (24), a pipeline between the fifth electromagnetic reversing valve (22) and the latch oil cylinder oil supply metering pump (21) is connected to the latch emergency oil supply accumulator (24), and the latch emergency oil supply accumulator (24) is connected to the oil tank (1).

9. The oil cylinder lifting system according to claim 7, characterized in that: It also includes a fourth overflow valve (25) and a sixth electromagnetic reversing valve (26) connected to the fourth overflow valve (25), and the pipeline between the latch cylinder oil supply metering pump (21) and the fifth electromagnetic reversing valve (22), the fourth overflow valve (25) and the oil tank (1) are connected in sequence.

10. A method for controlling the lifting of a cylinder, based on the cylinder lifting system according to any one of claims 1 to 9, characterized in that: include: Controlling the electric proportional pressure reducing valve (6) to output control oil to the pilot control port of the balancing valve (4), so that the hydraulic oil flowing out of the lifting cylinder (7) passes through the balancing valve (4) to the first pressure sensor (27); Acquiring a first pressure detected by the first pressure sensor (27) and a second pressure detected by the second pressure sensor (28); The displacement of the electric proportional variable pump assembly (2) is controlled according to the comparison between the first pressure and the second pressure, and / or the opening of the electric proportional pressure reducing valve (6) is controlled.

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