Hydraulic system capable of conveniently and manually controlling and adjusting double-cylinder synchronous error and using method

Abstract

The hydraulic system capable of conveniently and manually controlling and adjusting the double-cylinder synchronous error comprises a main operating valve, the main operating valve is connected with a hydraulic oil cylinder I and a hydraulic oil cylinder II through a branch operating valve I and a branch operating valve II, and a balance valve and a pipeline anti-explosion valve are sequentially arranged between the branch operating valve and a rodless cavity of the hydraulic oil cylinder. The hydraulic oil cylinder is connected with a rodless cavity safety valve and a rod cavity safety valve and is further provided with pressure balance oil ports, a stop valve is arranged between the two pressure balance oil ports, and the hydraulic oil cylinder further comprises a displacement sensor and a digital display instrument. The branch operating valves capable of being manually operated are used in cooperation with the displacement sensors, the problems of synchronous stretching and retracting of the double cylinders in a manual control mode and high-altitude operation safety are solved, and the working safety and reliability of a main engine under various working conditions are improved; and by arranging the balance valve, the safety valve and the pipeline explosion-proof valve, the use safety of the hydraulic oil cylinder is improved, and the operation of the system is more stable, safer and more reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic control, and in particular to a hydraulic system and a use method thereof which can conveniently and manually control and adjust a dual-cylinder synchronization error. Background Art

[0002] At present, most of the domestic medium and large tonnage tower crane double cylinder hydraulic control systems use a control loop consisting of a three-position four-way manual reversing valve, a relief valve, a diverter and collector valve, and two balancing valves to control the synchronous operation of the double cylinders. The structural principle of the diverter and collector valve itself leads to low synchronization accuracy (generally 3%), and the synchronization accuracy is greatly affected by the consistency of the two-way load. The manufacturing and installation errors of the large-tonnage tower crane structure cause the center of gravity to be not centered. In addition, the lateral wind force of high-altitude operations is large, resulting in a large difference in the lifting load of the two cylinders, resulting in a decrease in the synchronization accuracy of the diverter and collector valve. In addition, this control principle cannot manually adjust the extension and recovery speed of the two cylinders separately and independently. If there is a large difference in the telescopic distance of the double cylinders, it cannot be used, which seriously affects the progress of on-site construction. In addition, when the cylinder stops at any position and the tower crane boom rotates, the pressure of the rodless chamber of the cylinder locked by the balancing valve will increase significantly. In view of this working condition, the control principle of the existing large-tonnage tower crane double-cylinder hydraulic control system does not take into account the pressure release of the two chambers of the cylinder, which is not safe and has certain risks.

[0003] A safety valve is a hydraulic component that prevents cylinder pressure from overloading and can quickly release pressure.

[0004] A pipeline explosion-proof valve refers to a hydraulic component that prevents the oil cylinder from sliding down quickly when the external hose of the oil cylinder bursts.

[0005] A balancing valve is a hydraulic component that can generate back pressure when the cylinder is recovered under load to ensure that the cylinder is recovered at a uniform speed.

[0006] A digital display instrument refers to a display instrument that is used in conjunction with various sensors to display the measured physical quantity in digital form. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a hydraulic system and a method of use which have a simple structure, good effects and can conveniently and manually control the adjustment of the synchronization error of the two cylinders.

[0008] The present invention is implemented by the following technical scheme: a hydraulic system that can conveniently manually control and adjust the synchronization error of two cylinders, including a hydraulic pump connected to a hydraulic oil tank, the hydraulic pump is powered by a motor, the hydraulic pump is connected to a main operating valve, the main operating valve is connected to hydraulic cylinder I and hydraulic cylinder II respectively through branch operating valve I and branch operating valve II, the branch operating valve I and branch operating valve II are connected in parallel on one side of the main operating valve, a balancing valve I and a pipeline explosion-proof valve I are arranged in sequence between the branch operating valve I and the rodless chamber of the hydraulic cylinder I, the rodless chamber and the rod chamber of the hydraulic cylinder I are respectively connected to the hydraulic cylinder rodless chamber safety valve I and the hydraulic cylinder rod chamber safety valve I, the branch operating valve II A balancing valve II and a pipeline explosion-proof valve II are arranged in sequence between the rodless chamber of the hydraulic cylinder II. The rodless chamber and the rod chamber of the hydraulic cylinder II are respectively connected to the hydraulic cylinder rodless chamber safety valve II and the hydraulic cylinder rod chamber safety valve II. A hydraulic cylinder I rodless chamber pressure balancing oil port PH1 is arranged between the balancing valve I and the pipeline explosion-proof valve I. A hydraulic cylinder II rodless chamber pressure balancing oil port PH2 is arranged between the balancing valve II and the pipeline explosion-proof valve II. A stop valve is arranged between the PH1 port and the PH2 port. It also includes a displacement sensor I and a displacement sensor II arranged on one side of the piston rod of the hydraulic cylinder I and the hydraulic cylinder II. The displacement sensor I and the displacement sensor II are respectively connected to a digital display instrument I and a digital display instrument II.

[0009] Furthermore, an oil suction filter is provided between the hydraulic oil tank and the hydraulic pump, and an oil return filter is provided between the hydraulic oil tank and the branch operating valve I and the branch operating valve II.

[0010] The hydraulic oil tank is also connected with an air filter and an oil level and oil temperature gauge.

[0011] A system safety valve and an overflow valve are provided between the oil outlet end of the hydraulic pump and the hydraulic oil tank.

[0012] The oil inlet end of the main operating valve is connected with a pressure gauge.

[0013] The main operating valve is a three-position four-way manual reversing valve.

[0014] The branch operating valve I and the branch operating valve II are three-position four-way manual proportional reversing valves.

[0015] A method for using a hydraulic system that can conveniently and manually control the adjustment of dual-cylinder synchronization errors is divided into three working conditions: synchronous extension, synchronous retraction, and arbitrary position stop, and specifically includes the following steps: Synchronous extension working conditions: S1, the motor drives the hydraulic pump to provide high-pressure oil to the system; S2, the main operating valve is at the oil supply position for the branch operating valve Ⅰ and the branch operating valve Ⅱ, the branch operating valve Ⅰ and the branch operating valve Ⅱ are at the oil supply position for the rodless chamber of the hydraulic cylinder Ⅰ and the hydraulic cylinder Ⅱ, driving the piston rods of the hydraulic cylinder Ⅰ and the hydraulic cylinder Ⅱ to extend outward at the same time; S3, during the piston rod extension process, the operator performs manual control according to the extension displacement S1 of hydraulic cylinder I and the extension displacement S2 of hydraulic cylinder II displayed in real time by the electrical detection module; Synchronous recovery conditions: T1, the motor drives the hydraulic pump to provide high-pressure oil to the system; T2, the main operating valve is at the oil supply position for the branch operating valve Ⅰ and the branch operating valve Ⅱ, the branch operating valve Ⅰ and the branch operating valve Ⅱ are at the oil supply position for the rod chamber of the hydraulic cylinder Ⅰ and the hydraulic cylinder Ⅱ, and the piston rods of the hydraulic cylinder Ⅰ and the hydraulic cylinder Ⅱ are driven to be recovered at the same time; During the piston rod recovery process, the operator performs manual control based on the extension displacement S1 of hydraulic cylinder I and the extension displacement S2 of hydraulic cylinder II displayed in real time by the electrical detection module; Stopping condition at any position: E1. The main operating valve is in the oil return position or the middle position, and the system pressure is unloaded; E2, branch operating valve Ⅰ and branch operating valve Ⅱ are in the middle position; E3. Balance valve I locks the rodless chamber oil circuit of hydraulic cylinder I, and balance valve II locks the rodless chamber oil circuit of hydraulic cylinder II; E4. The working conditions of hydraulic cylinder Ⅰ and hydraulic cylinder Ⅱ are maintained.

[0016] In step S3, the manual control strategy is as follows: If S1>S2, the valve opening of the manually controlled branch operating valve Ⅰ will gradually decrease, reducing the flow entering the hydraulic cylinder Ⅰ; If S1=S2, keep the opening of branch operating valve Ⅰ and hydraulic cylinder Ⅱ unchanged; If S1<S2, the valve opening of the manual control sequence branch operation valve Ⅰ gradually increases, increasing the flow entering the hydraulic cylinder Ⅰ.

[0017] In step T3, the manual control strategy is as follows: If S1>S2, the valve opening of the manually controlled branch operating valve Ⅰ will gradually decrease, reducing the flow entering the hydraulic cylinder Ⅰ; If S1=S2, keep the opening of branch operating valve Ⅰ and hydraulic cylinder Ⅱ unchanged; If S1<S2, the valve opening of the manually controlled branch operating valve Ⅰ gradually increases, increasing the flow entering the hydraulic cylinder Ⅰ.

[0018] The present invention has the following advantages: the hydraulic system and use method of the present invention that can conveniently manually control and adjust the dual-cylinder synchronization error solves the problem of dual-cylinder synchronous extension and recovery and the safety problem of high-altitude operations in the manual control mode through the coordinated use of a manually operable branch operating valve and a displacement sensor, thereby improving the safety and reliability of the main engine under various working conditions; by setting a balancing valve, a safety valve and a pipeline explosion-proof valve, not only the safety of the use of the hydraulic cylinder is improved, but also the operation of the system is made more stable, safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0020] In the attached picture: Figure 1 It is the hydraulic principle diagram of the present invention; Figure 2 It is a structural schematic diagram of the present invention.

[0021] In the figure: 1. Air filter, 2. Oil level and oil temperature gauge, 3. Return oil filter, 4. Suction oil filter, 5. Hydraulic pump, 6. Motor, 7. System safety valve, 8. Overflow valve, 9. Pressure gauge, 10. Main operating valve, 11. Branch operating valve I, 12. Branch operating valve II, 13. Balance valve I, 14. Hydraulic cylinder rodless chamber safety valve I, 15. Pipeline explosion-proof valve I, 16. Hydraulic cylinder I, 17. Hydraulic cylinder rod chamber safety valve I, 18. Displacement sensor I, 19. Digital display instrument I, 20. Digital display instrument II, 21. Displacement sensor II, 22. Hydraulic cylinder rod chamber safety valve Ⅱ, 23. Hydraulic cylinder Ⅱ, 24. Balance valve Ⅱ, 25. Pipeline explosion-proof valve Ⅱ, 26. Hydraulic cylinder rodless chamber safety valve Ⅱ, 27. Stop valve, A1 port: branch operating valve Ⅰ oil outlet, B1 port: branch operating valve Ⅰ oil outlet, A2 port: branch operating valve Ⅱ oil outlet, B2 port: branch operating valve Ⅱ oil outlet, A1' port: hydraulic cylinder Ⅰ control valve group oil inlet, B1' port: hydraulic cylinder Ⅰ control valve group oil inlet, PH1 port: hydraulic cylinder Ⅰ rodless chamber pressure balance oil port, PH2 port: hydraulic cylinder Ⅱ rodless chamber pressure balance oil port.

[0022] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0024] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] like Figure 1 to Figure 2A hydraulic system that can conveniently and manually control and adjust the synchronization error of two cylinders is shown, comprising a hydraulic pump 4 connected to a hydraulic oil tank, the hydraulic pump 4 is powered by a motor 6, the hydraulic pump 4 is connected to a main operating valve 10, the main operating valve 10 is connected to a hydraulic cylinder Ⅰ16 and a hydraulic cylinder Ⅱ23 through a branch operating valve Ⅰ11 and a branch operating valve Ⅱ12, respectively, the branch operating valve Ⅰ11 and the branch operating valve Ⅱ12 are connected in parallel on one side of the main operating valve 10, a balancing valve Ⅰ13 and a pipeline explosion-proof valve Ⅰ15 are arranged in sequence between the branch operating valve Ⅰ11 and the rodless chamber of the hydraulic cylinder Ⅰ16, the rodless chamber and the rod chamber of the hydraulic cylinder Ⅰ16 are respectively connected to a hydraulic cylinder rodless chamber safety valve Ⅰ14 and a hydraulic cylinder rod chamber safety valve Ⅰ17, the branch operating valve Ⅱ12 is connected to the hydraulic cylinder Ⅱ A balancing valve II 24 and a pipeline explosion-proof valve II 25 are arranged between the rodless chambers of the hydraulic cylinder 23 in sequence, the rodless chamber and the rod chamber of the hydraulic cylinder II 23 are connected with a hydraulic cylinder rodless chamber safety valve II 26 and a hydraulic cylinder rod chamber safety valve II 22 respectively, a hydraulic cylinder I rodless chamber pressure balancing oil port PH1 is arranged between the balancing valve I 13 and the pipeline explosion-proof valve I 15, a hydraulic cylinder II rodless chamber pressure balancing oil port PH2 is arranged between the balancing valve II 24 and the pipeline explosion-proof valve II 25, a stop valve 27 is arranged between the PH1 port and the PH2 port, and also includes a displacement sensor I 18 and a displacement sensor II 21 arranged on one side of the piston rod of the hydraulic cylinder I 16 and the hydraulic cylinder II 23, and the displacement sensor I 18 and the displacement sensor II 21 are connected with a digital display instrument I 19 and a digital display instrument II 20 respectively.The hydraulic system of the present invention, which can conveniently and manually control and adjust the synchronization error of two cylinders, is provided with two hydraulic cylinders, hydraulic cylinder I16 and hydraulic cylinder II23. Both hydraulic cylinders are connected to the main operating valve through a branch operating valve. When the two hydraulic cylinders act synchronously, the two branch operating valves are in the same working position, and the main operating valve provides power hydraulic oil to drive the two hydraulic cylinders to extend or retract. In order to ensure the consistency of the movement amplitude of the two hydraulic cylinders, displacement sensors are provided beside the two hydraulic cylinders. The displacement sensors are connected to a digital display instrument. The displacement data of the hydraulic cylinder operation can be detected and displayed in real time through the cooperation of the displacement sensor and the digital display instrument. Manual judgment is made according to the data on the digital display instrument. When the values ​​detected by the two displacement sensors are different, the movement amplitude of the hydraulic cylinder is controlled by adjusting the opening of the branch operating valve to reduce the movement of the two hydraulic cylinders. The difference can ensure that the two hydraulic cylinders have the same movement amplitude, and the running speed of the two cylinders can be independently adjusted in real time and conveniently to solve the problem of high-precision synchronous extension and recovery of the two cylinders; the system is also equipped with a cylinder protection system, which mainly includes a balancing valve, a pipeline explosion-proof valve, a hydraulic cylinder rodless chamber safety valve, a hydraulic cylinder rod chamber safety valve and a balancing oil port. Among them, the balancing valve is used for the working conditions of the cylinder descending with load and stopping of movement to prevent the cylinder from "stalling" when descending; the pipeline explosion-proof valve prevents the uncontrolled decline of the cylinder when the balancing valve fails or the external hose of the cylinder bursts; the cylinder safety valve is used for secondary pressure protection of the rod chamber and the rodless chamber of the cylinder to prevent the cylinder pressure from overloading; the pressure balancing oil port is used for the working conditions of multi-cylinder synchronous lifting of the tower crane. By connecting the pressure balancing oil port of each cylinder with an external pipeline, the rodless chamber pressure of each cylinder can be made consistent, which is beneficial to the synchronous lifting and lowering of the cylinder.

[0027] like Figure 1 A hydraulic system that can conveniently and manually control and adjust the synchronization error of two cylinders is shown, wherein an oil suction filter 4 is provided between the hydraulic oil tank and the hydraulic pump 4, and an oil return filter 3 is provided between the hydraulic oil tank and the branch operating valve Ⅰ11 and the branch operating valve Ⅱ12. The hydraulic oil tank is also connected to an air filter 1 and an oil level and oil thermometer 2. The motor-driven hydraulic pump of the present invention provides power oil for the hydraulic system, wherein an oil suction filter, an oil return filter, an air filter and an oil level and oil thermometer are provided on the hydraulic oil tank connected to the hydraulic pump, the air filter is used to connect the inside of the oil cylinder with the atmosphere; the oil return filter is used to filter the return oil of the hydraulic system to ensure the cleanliness of the hydraulic system; the oil suction filter is used to filter the return oil of the hydraulic system to ensure the cleanliness of the hydraulic system; the oil level and oil thermometer is used to monitor the tank level and oil temperature data.

[0028] like Figure 1A hydraulic system that can conveniently and manually control and adjust the synchronization error of two cylinders is shown, and a system safety valve 7 and a relief valve 8 are provided between the oil outlet of the hydraulic pump 4 and the hydraulic oil tank. The system safety valve and the relief valve of the present invention are arranged in parallel, the relief valve is used to adjust the working pressure of the hydraulic system, and the system safety valve is used to perform secondary pressure protection on the system pressure in the event of failure of the relief valve to prevent the system pressure from overloading, thereby providing double protection for the system.

[0029] like Figure 1 A hydraulic system that can conveniently and manually control and adjust the synchronization error of two cylinders is shown, and the oil inlet end of the main operating valve 10 is connected to a pressure gauge 9.

[0030] like Figure 1 A hydraulic system that can conveniently and manually control and adjust the synchronization error of two cylinders is shown, and the main operating valve 10 is a three-position four-way manual reversing valve. The branch operating valve I 11 and the branch operating valve II 12 are three-position four-way manual proportional reversing valves. The main operating valve of the present invention is a three-position four-way manual reversing valve, which can realize system unloading and provide power oil for the branch operating valve I and the branch operating valve II through manual control; the branch operating valve II and the branch operating valve II are manual proportional directional flow valves, which can be manually adjusted separately and independently by cooperating with the electrical detection module and performing manual control, so as to ensure high-precision synchronous extension and recovery of the two cylinders.

[0031] like Figure 1 A hydraulic system that can conveniently and manually control and adjust the synchronization error of two cylinders is shown, wherein a hydraulic control end of the balancing valve Ⅰ13 is connected to the oil inlet pipeline of the rod chamber of the hydraulic oil cylinder Ⅰ16, and a hydraulic control end of the balancing valve Ⅱ24 is connected to the oil inlet pipeline of the rod chamber of the hydraulic oil cylinder Ⅱ23. The balancing valve of the present invention has a control end connected to the rod chamber, and when the rod chamber of the hydraulic cylinder is filled with oil, the balancing valve is activated in cooperation with the hydraulic oil pressure in the rodless chamber, providing a guarantee for the safe operation of the system.

[0032] like Figure 1 As shown, a method for using a hydraulic system that can conveniently and manually control the adjustment of the dual-cylinder synchronization error is divided into three working conditions: synchronous extension, synchronous recovery, and stop at any position, and specifically includes the following steps: Synchronous extension working conditions: S1, motor 6 drives hydraulic pump 5 to provide high-pressure oil to the system; S2, the main operating valve 10 is in the oil supply position for the branch operating valve Ⅰ11 and the branch operating valve Ⅱ12, and the branch operating valve Ⅰ11 and the branch operating valve Ⅱ12 are in the oil supply position for the rodless chamber of the hydraulic cylinder Ⅰ16 and the hydraulic cylinder Ⅱ23, such as Figure 1As shown, the main operating valve 10, the branch operating valve I11 and the branch operating valve II12 are all in the lower position, and the high-pressure hydraulic oil is divided into two paths from the outlet of the hydraulic pump 5 through the main operating valve 10. One path enters the rodless chamber of the hydraulic cylinder I16 through the branch operating valve I11, the A1 port, the A1' port, the sequence balance valve I13, and the pipeline explosion-proof valve I15, and the other path enters the rodless chamber of the hydraulic cylinder II23 through the A2 port, the A2' port, the balance valve II24, and the pipeline explosion-proof valve II25, driving the piston rods of the hydraulic cylinder I16 and the hydraulic cylinder II23 to extend outward at the same time; S3, during the piston rod extension process, the operator performs manual control according to the extension displacement S1 of the hydraulic cylinder Ⅰ16 and the extension displacement S2 of the hydraulic cylinder Ⅱ23 displayed in real time by the electrical detection module; The manual control strategy is as follows: If S1>S2, the valve opening of the manually controlled branch operating valve Ⅰ11 is gradually reduced, reducing the flow entering the hydraulic cylinder Ⅰ16; If S1=S2, keep the valve opening of branch operating valve Ⅰ11 and hydraulic cylinder Ⅱ23 unchanged; If S1<S2, the valve opening of the manually controlled branch operation valve Ⅰ11 gradually increases, increasing the flow entering the hydraulic cylinder Ⅰ16.

[0033] In addition, during the synchronous extension process, the system safety valve 7 performs secondary pressure protection on the system pressure to prevent system pressure overload; the hydraulic cylinder rodless chamber safety valve Ⅰ14 performs secondary pressure protection on the rodless chamber pressure chamber of the hydraulic cylinder Ⅰ16; the hydraulic cylinder rod chamber safety valve Ⅰ17 performs secondary pressure protection on the rod chamber pressure chamber of the hydraulic cylinder Ⅰ16; the hydraulic cylinder rodless chamber safety valve Ⅱ26 performs secondary pressure protection on the rodless chamber of the hydraulic cylinder Ⅱ23; the hydraulic cylinder rod chamber safety valve Ⅱ22 performs secondary pressure protection on the rod chamber pressure chamber of the hydraulic cylinder Ⅱ23; the pipeline explosion-proof valve Ⅰ15 is used to prevent the uncontrolled sliding of the hydraulic cylinder Ⅰ16 when the balance valve fails or the external hose bursts; the pipeline explosion-proof valve Ⅱ25 is used to prevent the uncontrolled sliding of the hydraulic cylinder Ⅱ23 when the balance valve fails or the external hose bursts.

[0034] Synchronous recovery conditions: T1, motor 6 drives hydraulic pump 5 to provide high-pressure oil to the system; T2, the main operating valve 10 is in the oil supply position for the branch operating valve Ⅰ11 and the branch operating valve Ⅱ12, and the branch operating valve Ⅰ11 and the branch operating valve Ⅱ12 are in the oil supply position for the rod chamber of the hydraulic cylinder Ⅰ16 and the hydraulic cylinder Ⅱ23, such as Figure 1As shown, the branch operating valve Ⅰ11 is in the lower position, the branch operating valve Ⅰ11 and the branch operating valve Ⅱ12 are in the upper position, and the high-pressure hydraulic oil is divided into two paths from the outlet of the hydraulic pump 5 through the main operating valve 10, one path enters the rod chamber of the hydraulic cylinder Ⅰ16 through the branch operating valve Ⅰ11, the B1 port, and the B1' port, and the other path enters the rod chamber of the hydraulic cylinder Ⅱ23 through the branch operating valve Ⅱ12, the B2 port, and the B2' port, driving the piston rods of the hydraulic cylinder Ⅰ16 and the hydraulic cylinder Ⅱ23 to be recovered at the same time; T3. During the piston rod recovery process, the operator performs manual control based on the extension displacement S1 of the hydraulic cylinder Ⅰ16 and the extension displacement S2 of the hydraulic cylinder Ⅱ23 displayed in real time by the electrical detection module; The manual control strategy is as follows: If S1>S2, the valve opening of the manually controlled branch operating valve Ⅰ11 is gradually reduced, reducing the flow entering the hydraulic cylinder Ⅰ16; If S1=S2, keep the valve opening of branch operating valve Ⅰ11 and hydraulic cylinder Ⅱ23 unchanged; If S1<S2, the valve opening of the manually controlled branch operating valve Ⅰ11 gradually increases, increasing the flow entering the hydraulic cylinder Ⅰ16.

[0035] In addition, during the synchronous recovery process, the system safety valve 7 performs secondary pressure protection on the system pressure to prevent the system pressure from overloading; the hydraulic cylinder rodless chamber safety valve Ⅰ14 performs secondary pressure protection on the rodless chamber pressure chamber of the hydraulic cylinder Ⅰ16; the hydraulic cylinder rod chamber safety valve Ⅰ17 performs secondary pressure protection on the rod chamber pressure chamber of the hydraulic cylinder Ⅰ16; the hydraulic cylinder rodless chamber safety valve Ⅱ26 performs secondary pressure protection on the rodless chamber of the hydraulic cylinder Ⅱ23; the hydraulic cylinder rod chamber safety valve Ⅱ22 The rod chamber pressure chamber of the hydraulic cylinder Ⅱ23 is subjected to secondary pressure protection; the pipeline explosion-proof valve Ⅰ15 is used to prevent the uncontrolled sliding of the hydraulic cylinder Ⅰ16 when the balance valve fails or the external hose bursts; the pipeline explosion-proof valve Ⅱ25 is used to prevent the uncontrolled sliding of the hydraulic cylinder Ⅱ23 when the balance valve fails or the external hose bursts; the PH1 port and the PH2 port are connected to achieve the consistency of the rodless chamber pressure of each cylinder, thereby ensuring the consistency of the opening pressure of the balance valve Ⅰ13 and the balance valve Ⅱ24, which is beneficial to the synchronous lifting and lowering of the cylinders.

[0036] Stopping condition at any position: E1, the main operating valve 10 is in the oil return position or the middle position, such as Figure 1 As shown, the main operating valve 10 is in the middle position or the upper position, and the system pressure is unloaded; E2, branch operating valve Ⅰ11 and branch operating valve Ⅱ12 are in the middle position; E3, the balance valve Ⅰ13 locks the rodless chamber oil circuit of the hydraulic cylinder Ⅰ16, and the balance valve Ⅱ24 locks the rodless chamber oil circuit of the hydraulic cylinder Ⅱ23; E4. The working conditions of hydraulic cylinder Ⅰ16 and hydraulic cylinder Ⅱ23 are maintained.

[0037] In addition, in the process of maintaining the stopped state, the system safety valve 7 performs secondary pressure protection on the system pressure to prevent the system pressure from overloading; the hydraulic cylinder rodless chamber safety valve Ⅰ14 performs secondary pressure protection on the rodless chamber pressure chamber of the hydraulic cylinder Ⅰ16; the hydraulic cylinder rod chamber safety valve Ⅰ17 performs secondary pressure protection on the rod chamber pressure chamber of the hydraulic cylinder Ⅰ16; the hydraulic cylinder rodless chamber safety valve Ⅱ26 performs secondary pressure protection on the rodless chamber of the hydraulic cylinder Ⅱ23; the hydraulic cylinder rod chamber safety valve Ⅱ22 performs secondary pressure protection on the rod chamber pressure chamber of the hydraulic cylinder Ⅱ23; the pipeline explosion-proof valve Ⅰ15 is used to prevent the uncontrolled sliding of the hydraulic cylinder Ⅰ16 when the balance valve fails or the external hose bursts; the pipeline explosion-proof valve Ⅱ25 is used to prevent the uncontrolled sliding of the hydraulic cylinder Ⅱ23 when the balance valve fails or the external hose bursts.

[0038] The hydraulic system and the use method of the invention, which can conveniently and manually control and adjust the synchronization error of the two cylinders, are composed of a power source module, an operating valve group module, an oil cylinder control valve group module, an electrical detection module, and an actuator. The power source module includes a motor, a hydraulic pump, an air filter, an oil return filter, an oil suction filter, and an oil temperature gauge; the operating valve group module includes a relief valve, a system safety valve, a main operating valve, a branch operating valve I, and a branch operating valve II; the oil cylinder control valve group module includes an oil cylinder safety valve, a pipeline explosion-proof valve, a balance valve, and a pressure balance oil port; the electrical detection module includes a displacement sensor I, a displacement sensor II, a digital display instrument I, and a digital display instrument II; The hydraulic actuator is a hydraulic cylinder, including hydraulic cylinder I and hydraulic cylinder II. The power source module provides power to the operating valve group module, and the electrical detection module detects the synchronization of the actuator's action, and is used in conjunction with the branch operating valve I and the branch operating valve II to complete the synchronization of the dual hydraulic cylinder actions. Under the action of the cylinder control valve group module, the safety of the use of the dual hydraulic cylinders is guaranteed, providing a strong guarantee for the normal operation of the system. The technical solution of the present application has advanced control principles, complete functions, high dual-cylinder synchronization accuracy, strong adaptability to working conditions, and complete safety measures, which improves the safety and reliability of the main engine under various working conditions and has strong versatility.

[0039] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0040] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present invention and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by this application.

[0041] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A hydraulic system that can conveniently and manually control and adjust the synchronization error of two cylinders, characterized in that: The invention comprises a hydraulic pump (4) connected to a hydraulic oil tank, wherein the hydraulic pump (4) is powered by a motor (6), the hydraulic pump (4) is connected to a main operating valve (10), the main operating valve (10) is connected to a hydraulic cylinder I (16) and a hydraulic cylinder II (23) respectively through a branch operating valve I (11) and a branch operating valve II (12), the branch operating valve I (11) and the branch operating valve II (12) are connected in parallel on one side of the main operating valve (10), a balancing valve I (13) and a pipeline explosion-proof valve I (15) are provided in sequence between the branch operating valve I (11) and the rodless chamber of the hydraulic cylinder I (16), the rodless chamber and the rod chamber of the hydraulic cylinder I (16) are connected to a hydraulic cylinder rodless chamber safety valve I (14) and a hydraulic cylinder rod chamber safety valve I (17) respectively, and the branch operating valve II (12) and the rodless chamber of the hydraulic cylinder II (23) are connected in sequence between the branch operating valve I (11) and the rodless chamber of the hydraulic cylinder II (23). A balancing valve II (24) and a pipeline explosion-proof valve II (25) are provided. The rodless chamber and the rod chamber of the hydraulic cylinder II (23) are respectively connected to a hydraulic cylinder rodless chamber safety valve II (26) and a hydraulic cylinder rod chamber safety valve II (22). A hydraulic cylinder I rodless chamber pressure balancing oil port PH1 is provided between the balancing valve I (13) and the pipeline explosion-proof valve I (15). A hydraulic cylinder II rodless chamber pressure balancing oil port PH2 is provided between the balancing valve II (24) and the pipeline explosion-proof valve II (25). A stop valve (27) is provided between the PH1 port and the PH2 port. The hydraulic cylinder I (16) and the hydraulic cylinder II (23) also include a displacement sensor I (18) and a displacement sensor II (21) arranged on one side of the piston rod. The displacement sensor I (18) and the displacement sensor II (21) are respectively connected to a digital display instrument I (19) and a digital display instrument II (20).

2. A hydraulic system capable of conveniently and manually controlling and adjusting the synchronization error of two cylinders as claimed in claim 1, characterized in that: An oil suction filter (4) is provided between the hydraulic oil tank and the hydraulic pump (4), and an oil return filter (3) is provided between the hydraulic oil tank and the branch operating valve I (11) and the branch operating valve II (12).

3. A hydraulic system capable of conveniently and manually controlling and adjusting the synchronization error of two cylinders as claimed in claim 1, characterized in that: The hydraulic oil tank is also connected to an air filter (1) and an oil level and oil temperature gauge (2).

4. A hydraulic system capable of conveniently and manually controlling and adjusting the synchronization error of two cylinders as claimed in claim 1, characterized in that: A system safety valve (7) and an overflow valve (8) are provided between the oil outlet end of the hydraulic pump (4) and the hydraulic oil tank.

5. A hydraulic system capable of conveniently and manually controlling and adjusting the synchronization error of two cylinders as claimed in claim 1, characterized in that: The oil inlet end of the main operating valve (10) is connected to a pressure gauge (9).

6. A hydraulic system capable of conveniently and manually controlling and adjusting the dual-cylinder synchronization error as claimed in claim 1, characterized in that: The main operating valve (10) is a three-position four-way manual reversing valve.

7. A hydraulic system capable of conveniently and manually controlling and adjusting the synchronization error of two cylinders as claimed in claim 1, characterized in that: The branch operating valve I (11) and the branch operating valve II (12) are three-position four-way manual proportional reversing valves.

8. A method for using the hydraulic system capable of conveniently and manually controlling the adjustment of dual-cylinder synchronization error according to claim 1, characterized in that: It is divided into three working conditions: synchronous extension, synchronous retraction and stop at any position, which specifically include the following steps: Synchronous extension working conditions: S1, the motor (6) drives the hydraulic pump (5) to provide high-pressure oil to the system; S2, the main operating valve (10) is at the oil supply position for the branch operating valve I (11) and the branch operating valve II (12), the branch operating valve I (11) and the branch operating valve II (12) are at the oil supply position for the rodless chamber of the hydraulic cylinder I (16) and the hydraulic cylinder II (23), and the piston rods of the hydraulic cylinder I (16) and the hydraulic cylinder II (23) are driven to extend outward at the same time; S3, during the piston rod extension process, the operator performs manual control based on the extension displacement S1 of the hydraulic cylinder I (16) and the extension displacement S2 of the hydraulic cylinder II (23) displayed in real time by the electrical detection module; Synchronous recovery conditions: T1, the motor (6) drives the hydraulic pump (5) to provide high-pressure oil to the system; T2, the main operating valve (10) is at the oil supply position for the branch operating valve I (11) and the branch operating valve II (12), the branch operating valve I (11) and the branch operating valve II (12) are at the oil supply position for the rod chambers of the hydraulic cylinder I (16) and the hydraulic cylinder II (23), and the piston rods of the hydraulic cylinder I (16) and the hydraulic cylinder II (23) are simultaneously recovered; T3: During the piston rod recovery process, the operator performs manual control based on the extension displacement S1 of the hydraulic cylinder I (16) and the extension displacement S2 of the hydraulic cylinder II (23) displayed in real time by the electrical detection module; Stopping condition at any position: E1. The main operating valve (10) is in the oil return position or the middle position, and the system pressure is unloaded; E2, branch operating valve I (11) and branch operating valve II (12) are in the middle position; E3, the balancing valve I (13) locks the rodless chamber oil circuit of the hydraulic cylinder I (16), and the balancing valve II (24) locks the rodless chamber oil circuit of the hydraulic cylinder II (23); E4. The working conditions of hydraulic cylinder Ⅰ (16) and hydraulic cylinder Ⅱ (23) are maintained.

9. A method for using a hydraulic system capable of conveniently and manually controlling the adjustment of dual-cylinder synchronization errors as claimed in claim 8, characterized in that: In step S3, the manual control strategy is as follows: If S1>S2, the valve opening of the manually controlled branch operating valve Ⅰ (11) is gradually reduced, thereby reducing the flow rate entering the hydraulic cylinder Ⅰ (16); If S1=S2, keep the valve opening of branch operating valve Ⅰ (11) and hydraulic cylinder Ⅱ (23) unchanged; If S1<S2, the valve opening of the manual control sequence branch operation valve Ⅰ (11) gradually increases, increasing the flow entering the hydraulic cylinder Ⅰ (16).

10. The method for using a hydraulic system capable of conveniently and manually controlling and adjusting a dual-cylinder synchronization error as claimed in claim 8, characterized in that: In step T3, the manual control strategy is as follows: If S1>S2, the valve opening of the manually controlled branch operating valve Ⅰ (11) is gradually reduced, thereby reducing the flow rate entering the hydraulic cylinder Ⅰ (16); If S1=S2, keep the valve opening of branch operating valve Ⅰ (11) and hydraulic cylinder Ⅱ (23) unchanged; If S1<S2, the valve opening of the manually controlled branch operating valve Ⅰ (11) gradually increases, thereby increasing the flow rate entering the hydraulic cylinder Ⅰ (16).

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