Gantry shear control system

Abstract

The invention provides a gantry shear control system which comprises a quick cylinder, a side cylinder and a control oil way, and piston rods of the quick cylinder and the side cylinder move synchronously; the control oil way comprises an oil inlet pipeline, an oil outlet pipeline, a first oil way, a second oil way, a third oil way, a fourth oil way and a fifth oil way; the fast cylinder comprises a fast descending state, a slow pressurizing state, a slow return stroke state and a fast return stroke state. The fifth oil way is arranged between the upper cavity and the lower cavity of the side cylinder, the upper cavity and the lower cavity of the side cylinder are in a conducting state when the rapid cylinder is in a rapid descending state and a rapid return stroke state, negative pressure generated when the side cylinder is driven to move due to movement of the gantry scissors is compensated, the upper cavity and the lower cavity of the side cylinder are always kept full of oil, and the service life of the side cylinder is prolonged. Air is prevented from entering the lower cavity of the side cylinder and a pipeline, so that the air is prevented from entering the hydraulic oil tank to cause large disturbance to oil liquid when the gantry scissors operate, air bubbles are avoided, fluctuation and floating of impurities in the oil liquid are reduced, and the service life of a hydraulic oil pump is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of gantry shear control, in particular to a gantry shear control system. Background Art

[0002] The lower chamber of the side cylinder of traditional gantry shearing equipment (with a fast cylinder or a speed-increasing cylinder) is only filled with oil during the interlaced stage of the cutter head and the workbench. When the gantry shearing equipment returns quickly, the lower chambers of the two side cylinders suck in air through the oil tank; since the oil return pipeline of the lower chamber of the side cylinder needs to inhale air and is connected above the liquid surface, during the second downward movement, the oil in the cylinder is sprayed above the liquid surface, causing a large disturbance to the oil in the hydraulic tank, making it easy for the oil in the hydraulic tank to produce bubbles, and the impurities in the oil fluctuate and float in the tank, which has a great impact on the service life of the hydraulic oil pump; if the side cylinder participates in the return stroke throughout the whole process, the fast return stroke effect cannot be achieved. Summary of the Invention

[0003] The purpose of the present invention is to provide a gantry shear control system to solve the problems existing in the above-mentioned prior art.

[0004] To achieve the above-mentioned objectives, the present invention provides a gantry shear control system for controlling the operation of the gantry scissors, the control system including a fast cylinder, a side cylinder and a control oil circuit, the piston rods of the fast cylinder and the side cylinder are connected to the same side of the gantry scissors, and the piston rods of the fast cylinder and the side cylinder move synchronously; the control oil circuit includes an oil inlet pipeline connected to the system oil supply port, an oil outlet pipeline connected to the system oil return port, a first oil circuit connected to the upper chamber of the fast cylinder, a second oil circuit connected to the lower chamber of the fast cylinder, a third oil circuit connected to the upper chamber of the side cylinder, a fourth oil circuit connected to the lower chamber of the side cylinder, and a fifth oil circuit connected between the upper chamber and the lower chamber of the side cylinder; each oil circuit is provided with an on-off valve assembly for controlling the opening and closing of the oil circuit.

[0005] The fast cylinder includes a fast descending state, a slow pressurizing state, a slow return state and a fast return state:

[0006] When the fast cylinder is in a fast descending state, the first oil circuit is connected to the oil inlet pipeline, the second oil circuit is connected to the oil outlet pipeline, the fifth oil circuit is in a conducting state, and the third oil circuit and the fourth oil circuit are in a closed state.

[0007] When the fast cylinder is in the fast return state, the second oil circuit is connected to the oil inlet pipeline, the first oil circuit is connected to the oil outlet pipeline, the fifth oil circuit is in the conducting state, and the third oil circuit and the fourth oil circuit are in the closed state.

[0008] When the fast cylinder is in a slow pressurization state, the first oil circuit and the third oil circuit are both connected to the oil inlet pipeline, the second oil circuit and the fourth oil circuit are both connected to the oil outlet pipeline, and the fifth oil circuit is in a closed state;

[0009] When the fast cylinder is in the slow return state, the second oil circuit and the fourth oil circuit are both connected to the oil inlet pipeline, the first oil circuit and the third oil circuit are both connected to the oil outlet pipeline, and the fifth oil circuit is in a closed state.

[0010] Optionally, the on-off valve assembly includes a cartridge valve and an electromagnetic reversing valve, the cartridge valve includes a main oil port A, a main oil port B and a control port C, and the control port C is connected to the oil port A or the oil port B of the electromagnetic reversing valve; based on the control of the electromagnetic reversing valve, the passage between the main oil port A and the main oil port B of the cartridge valve is switched between an on state and an off state.

[0011] Optionally, a fluid replenishing tank is further included, and a fluid replenishing oil circuit is connected between the fluid replenishing tank and the upper chamber of the side cylinder. A filling valve is provided on the fluid replenishing oil circuit, and the filling valve is connected to a filling valve control pipeline. Based on the working state of the filling valve control pipeline, the flow direction of the hydraulic oil inside the fluid replenishing oil circuit is controlled.

[0012] Optionally, the oil outlet pipeline includes a first oil outlet pipeline, a second oil outlet pipeline and a fluid replenishing oil pipeline, the first oil circuit and the third oil circuit are respectively connected to the first oil outlet pipeline, and the second oil circuit and the fourth oil circuit are respectively connected to the second oil outlet pipeline; a third on-off valve assembly is provided on the first oil outlet pipeline, and a fourth on-off valve assembly is provided on the second oil outlet pipeline, and the main oil ports B of the cartridge valves inside the third on-off valve assembly and the fourth on-off valve assembly are both connected to the system oil return port; a ninth solenoid reversing valve is provided on the filling valve control pipeline, and a first passage is provided inside the ninth solenoid reversing valve, one end of the first passage is connected to the filling valve control pipeline, and the other end of the first passage is connected to the system oil return port or the system oil supply port, and based on the working state of the ninth solenoid reversing valve, the filling valve control pipeline is controlled to be connected to one of the system oil return port or the system oil supply port.

[0013] Optionally, the fourth on-off valve assembly includes a fourth solenoid reversing valve and a fourth cartridge valve, the fourth solenoid reversing valve is a three-position four-way solenoid reversing valve, the P port of the fourth solenoid reversing valve is connected to the control port C of the fourth cartridge valve, the A port and the B port of the fourth solenoid reversing valve are respectively connected to the first overflow valve and the second overflow valve, and the set pressure of the first overflow valve is greater than the set pressure of the second overflow valve.

[0014] Optionally, the oil inlet pipeline includes a first oil inlet pipeline and a second oil inlet pipeline, the first oil inlet pipeline and the second oil inlet pipeline are both connected to the system oil supply port, the first oil circuit and the third oil circuit are respectively connected to the first oil inlet pipeline, and the second oil circuit and the fourth oil circuit are respectively connected to the second oil inlet pipeline; a first on-off valve assembly is provided on the first oil inlet pipeline, and a second on-off valve assembly is provided on the second oil inlet pipeline.

[0015] Optionally, a one-way valve assembly is also included, and the on-off valve assembly on the fifth oil circuit is an eighth on-off valve assembly, and the eighth on-off valve assembly includes an eighth solenoid reversing valve and an eighth cartridge valve. The one-way valve assembly includes a second one-way valve, a third one-way valve and a fourth one-way valve. The liquid outlet ends of the second one-way valve, the third one-way valve and the fourth one-way valve are connected and then connected to the P port of the eighth solenoid reversing valve. The liquid inlet end of the second one-way valve is arranged at one end of the fifth oil circuit close to the lower chamber of the side cylinder, the liquid inlet end of the fourth one-way valve is arranged at one end of the fifth oil circuit close to the upper chamber of the side cylinder, and the liquid inlet end of the third one-way valve is arranged at one end of the oil inlet pipeline close to the system oil inlet.

[0016] Optionally, one end of the oil inlet pipeline close to the system oil inlet is connected to the liquid inlet of the first one-way valve, and the liquid outlet of the first one-way valve is connected to the accumulator and the liquid inlet of the third one-way valve.

[0017] Optionally, the second oil circuit and the fourth oil circuit are connected to a first safety valve and a second safety valve respectively.

[0018] Optionally, there are two side cylinders, which are arranged on both sides of the fast cylinder.

[0019] Compared with the prior art, the present invention has the following advantages and technical effects:

[0020] The present invention includes at least four working states, namely, a fast descending state, a slow pressurizing state, a slow return state and a fast return state. In the above different states, the opening and closing of each oil circuit is controlled by the on-off valve assembly, and the present invention sets a fifth oil circuit between the upper chamber and the lower chamber of the side cylinder, so that the upper chamber and the lower chamber of the side cylinder can be connected and disconnected. When the fast cylinder is in the fast descending state and the fast return state, the upper chamber and the lower chamber of the side cylinder are in a conducting state, which compensates for the negative pressure generated by the movement of the side cylinder driven by the movement of the gantry scissors, so that the upper and lower chambers of the side cylinder are always kept full of oil. Prevent air from entering the lower chamber of the side cylinder and the pipeline, thereby preventing air from entering the hydraulic oil tank and causing greater disturbance to the oil when the gantry scissors are running, avoiding the generation of bubbles, reducing the fluctuation and floating of impurities in the oil, and increasing the service life of the hydraulic oil pump; when the fast cylinder is in the slow pressurization state and the slow return state, the upper and lower chambers of the side cylinder are in a disconnected state, preventing the fifth oil circuit from interfering with the third and fourth oil circuits, ensuring that the third and fourth oil circuits are in a disconnected state, so that both can normally provide hydraulic oil and recover hydraulic oil to the upper and lower chambers of the side cylinder, and ensure that the side cylinder can operate normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0022] Figure 1 This is a control principle diagram of the control system of the present invention;

[0023] Figure 2 for Figure 1 A partial enlarged view of middle A;

[0024] Figure 3 for Figure 1 A partial enlarged view of B.

[0025] Among them, 1, gantry scissors, 2, fast cylinder, 3, side cylinder, 4, system oil supply port, 5, system oil return port, 6, first oil circuit, 7, second oil circuit, 8, third oil circuit, 9, fourth oil circuit, 10, fifth oil circuit, 11, liquid replenishing tank, 12, liquid replenishing oil circuit, 13, filling valve, 14, first oil outlet pipeline, 15, second oil outlet pipeline, 16, filling valve control pipeline, 17, first oil inlet pipeline, 18, second oil inlet pipeline, 21, first cartridge valve, 22, second cartridge valve, 23, third cartridge valve, 24, fourth cartridge valve, 25, fifth cartridge valve, 26, sixth cartridge valve Valve, 27, seventh cartridge valve, 28, eighth cartridge valve, 31, first solenoid reversing valve, 32, second solenoid reversing valve, 33, third solenoid reversing valve, 34, fourth solenoid reversing valve, 35, fifth solenoid reversing valve, 36, sixth solenoid reversing valve, 37, seventh solenoid reversing valve, 38, eighth solenoid reversing valve, 39, ninth solenoid reversing valve, 41, first overflow valve, 42, second overflow valve, 43, first safety valve, 44, second safety valve, 51, first one-way valve, 52, second one-way valve, 53, third one-way valve, 54, fourth one-way valve, 55, accumulator. DETAILED DESCRIPTION

[0026] It should be noted that, unless there is a conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other. The embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0027] Referring to the accompanying drawings, the present invention provides a gantry shear control system for controlling the operation of a gantry shear 1. The gantry shear control system includes a fast cylinder 2, a side cylinder 3, and a control oil circuit. The piston rods of the fast cylinder 2 and the side cylinder 3 are connected to the same side of the gantry shear 1, and the piston rods of the fast cylinder 2 and the side cylinder 3 move synchronously. The control oil circuit includes an oil inlet line connected to the system oil supply port 4, an oil outlet line connected to the system oil return port 5, a first oil circuit 6 connected to the upper chamber of the fast cylinder 2, a second oil circuit 7 connected to the lower chamber of the fast cylinder 2, a third oil circuit 8 connected to the upper chamber of the side cylinder 3, a fourth oil circuit 9 connected to the lower chamber of the side cylinder 3, and a fifth oil circuit 10 connected between the upper and lower chambers of the side cylinder 3. Each oil circuit is provided with an on-off valve assembly for controlling the opening and closing of the oil circuit. In some embodiments, two side cylinders 3 are provided, one on each side of the fast cylinder 2, to ensure pressure balance on both sides of the fast cylinder 2 of the gantry shear 1.

[0028] Among them, the fast cylinder 2 includes a fast descending state, a slow pressurizing state, a slow return state and a fast return state: when the fast cylinder 2 is in the fast descending state, the first oil circuit 6 is connected to the oil inlet pipeline, the second oil circuit 7 is connected to the oil outlet pipeline, the fifth oil circuit 10 is in a conducting state, and the third oil circuit 8 and the fourth oil circuit 9 are in a closed state; when the fast cylinder 2 is in the fast return state, the second oil circuit 7 is connected to the oil inlet pipeline, the first oil circuit 6 is connected to the oil outlet pipeline, the fifth oil circuit 10 is in a conducting state, and the third oil circuit 8 and the fourth oil circuit 9 are in a closed state; when the fast cylinder 2 is in the slow pressurizing state, the first oil circuit 6 and the third oil circuit 8 are both connected to the oil inlet pipeline, the second oil circuit 7 and the fourth oil circuit 9 are both connected to the oil outlet pipeline, and the fifth oil circuit 10 is in a closed state; when the fast cylinder 2 is in the slow return state, the second oil circuit 7 and the fourth oil circuit 9 are both connected to the oil inlet pipeline, the first oil circuit 6 and the third oil circuit 8 are both connected to the oil outlet pipeline, and the fifth oil circuit 10 is in a closed state.

[0029] The fast cylinder 2 in this embodiment includes at least four working states, namely, a fast downward state, a slow pressurizing state, a slow return state and a fast return state; when the fast cylinder 2 is in the fast downward state, the first oil circuit 6 is connected with the oil inlet pipeline, and the second oil circuit 7 is connected with the oil outlet pipeline. The oil inlet pipeline provides hydraulic oil with a certain pressure to the first oil circuit 6. The hydraulic oil enters the upper chamber of the fast cylinder 2 through the first oil circuit 6, and pushes the piston inside the fast cylinder 2 to move downward, thereby pushing the gantry scissors 1 to move downward (that is, the gantry scissors 1 approaches the workpiece to be sheared). The hydraulic oil in the lower chamber of the fast cylinder 2 enters the oil outlet pipeline through the second oil circuit 7 and is discharged into the system oil return port 5. When the gantry scissors 1 moves downward, it drives the piston rod of the side cylinder 3 to move downward, thereby forming a negative pressure in the upper chamber of the side cylinder 3, and the hydraulic oil inside the lower chamber of the side cylinder 3 is squeezed. At this time, the fifth oil circuit 10 is in a conducting state, and the hydraulic oil inside the lower chamber of the side cylinder 3 is recovered to the upper chamber of the side cylinder 3 through the fifth oil circuit 10, making up for the negative pressure generated in the upper chamber of the side cylinder 3, so that the upper and lower chambers of the side cylinder 3 are always kept full of oil, avoiding the generation of vacuum in the upper chamber of the side cylinder 3, and avoiding the waiting when the equipment is converted from a fast downward state to a slow pressurization state. At the same time, it prevents air from entering the lower chamber of the side cylinder 3 and the pipeline, thereby preventing air from entering the hydraulic oil tank when the gantry scissors are running, causing a large disturbance to the oil, avoiding the generation of bubbles, and reducing the fluctuation and floating of impurities in the oil.

[0030] When the fast cylinder 2 is in a slow pressurization state, the first oil circuit 6 and the third oil circuit 8 are connected to the oil inlet pipeline, the second oil circuit 7 and the fourth oil circuit 9 are connected to the oil outlet pipeline, and the fifth oil circuit 10 is in a closed state; the oil inlet pipeline supplies hydraulic oil with a certain pressure to the upper chamber of the fast cylinder 2 and the upper chamber of the side cylinder 3 through the first oil circuit 6 and the third oil circuit 8 respectively. Under the action of the hydraulic oil, the piston rods of the fast cylinder 2 and the side cylinder 3 move downward synchronously, and jointly push the gantry scissors 1 to move downward, that is, the gantry scissors 1 starts to shear the workpiece to be sheared. Since the fast cylinder 2 and the side cylinder 3 act together on the gantry scissors 1, the shear force of the gantry scissors 1 is increased; at the same time, the hydraulic oil in the lower chamber of the fast cylinder 2 and the lower chamber of the side cylinder 3 enters the oil outlet pipeline through the second oil circuit 7 and the fourth oil circuit 9 respectively, and is discharged into the system oil return port 5.

[0031] When the fast cylinder 2 is in the slow return state, the second oil circuit 7 and the fourth oil circuit 9 are connected to the oil inlet pipeline, the first oil circuit 6 and the third oil circuit 8 are connected to the oil outlet pipeline, and the fifth oil circuit 10 is in a closed state; at this time, the gantry scissors 1 has completed the shearing of the workpiece to be sheared, and the gantry scissors 1 starts to return, and the oil inlet pipeline provides hydraulic oil with a certain pressure to the lower chamber of the fast cylinder 2 and the lower chamber of the side cylinder 3 through the second oil circuit 7 and the fourth oil circuit 9 respectively. Under the action of the hydraulic oil, the piston rods of the fast cylinder 2 and the side cylinder 3 move upward synchronously, and jointly drive the gantry scissors 1 to move upward, that is, the gantry scissors 1 begins to separate from the workpiece to be sheared; the hydraulic oil in the upper chamber of the fast cylinder 2 and the upper chamber of the side cylinder 3 enters the oil outlet pipeline through the first oil circuit 6 and the third oil circuit 8 respectively, and is discharged into the system oil return port 5.

[0032] When the fast cylinder 2 is in the fast return state, the second oil circuit 7 is connected with the oil inlet pipeline, the first oil circuit 6 is connected with the oil outlet pipeline, the fifth oil circuit 10 is in the conducting state, and the third oil circuit 8 and the fourth oil circuit 9 are in the closed state; at this time, the gantry scissors 1 has been completely separated from the workpiece to be sheared, and the oil inlet pipeline provides hydraulic oil with a certain pressure to the lower chamber of the fast cylinder 2 through the second oil circuit 7. Under the action of the hydraulic oil, the piston rod of the fast cylinder 2 moves upward, driving the gantry scissors 1 to move upward, and the upper chamber of the fast cylinder 2 is opened. The hydraulic oil in the oil outlet pipe enters the first oil circuit 6 and is discharged into the system oil return port 5; at this time, the gantry scissors 1 drives the piston rod of the side cylinder 3 to move upward when it moves upward, thereby forming a negative pressure in the lower chamber of the side cylinder 3, and the hydraulic oil inside the upper chamber of the side cylinder 3 is squeezed. At this time, the fifth oil circuit 10 is in a conducting state, and the hydraulic oil inside the upper chamber of the side cylinder 3 enters the lower chamber of the side cylinder 3 through the fifth oil circuit 10, compensating for the negative pressure generated in the upper chamber of the side cylinder 3, so that the upper and lower chambers of the side cylinder 3 are always kept full of oil.

[0033] In the above-mentioned different states, the opening and closing of each oil circuit is controlled by the on-off valve assembly, and the present invention sets a fifth oil circuit between the upper chamber and the lower chamber of the side cylinder, so that the upper chamber and the lower chamber of the side cylinder can be connected and disconnected. When the fast cylinder 2 is in the fast downward state and the fast return state, the upper chamber and the lower chamber of the side cylinder are in the connected state, compensating for the negative pressure generated by the movement of the side cylinder 3 caused by the movement of the gantry scissors 1, so that the upper and lower chambers of the side cylinder 3 are always kept full of oil, avoiding the entry of air into the lower chamber of the side cylinder 3 and the pipeline, thereby avoiding the air entering the hydraulic oil tank when the gantry scissors are running and causing a large disturbance to the oil, avoiding the generation of bubbles, reducing the fluctuation and floating of impurities in the oil, and improving the service life of the hydraulic oil pump; when the fast cylinder 2 is in the slow pressurization state and the slow return state, the upper chamber and the lower chamber of the side cylinder are in the disconnected state, preventing the fifth oil circuit from interfering with the third oil circuit 8 and the fourth oil circuit 9, ensuring that the third oil circuit 8 and the fourth oil circuit 9 are in the disconnected state, so that the two can normally provide hydraulic oil and recover hydraulic oil to the upper and lower chambers of the side cylinder, and ensure that the side cylinder can operate normally.

[0034] A further optimized solution includes a cartridge valve and a solenoid reversing valve. The cartridge valve includes a main oil port A, a main oil port B, and a control port C. The cartridge valve control port C is connected to either the solenoid reversing valve oil port A or oil port B. Based on the control of the solenoid reversing valve, the passage between the cartridge valve's main oil port A and main oil port B switches between an on-state and an off-state. In this embodiment, by controlling whether the solenoid reversing valve is energized, the solenoid reversing valve is controlled to supply hydraulic oil to the cartridge valve control port C through the solenoid reversing valve oil port A or oil port B, thereby driving the valve core in the cartridge valve to overcome the spring force, thereby controlling the passage between the cartridge valve's main oil port A and main oil port B to switch between an on-state and an off-state, thereby controlling the opening and closing of the oil circuit in which the on-off valve assembly is located.

[0035] In some embodiments, the gantry shear control system also includes a fluid replenishing tank 11, a fluid replenishing oil circuit 12 is connected between the fluid replenishing tank 11 and the upper chamber of the side cylinder 3, a filling valve 13 is provided on the fluid replenishing oil circuit 12, and the filling valve 13 is connected to a filling valve control pipeline 16. Based on the working state of the filling valve control pipeline 16, the flow direction of the hydraulic oil inside the fluid replenishing oil circuit 12 is controlled. In this embodiment, the flow direction of the hydraulic oil in the replenishing oil circuit 12 is controlled by the filling valve control pipeline 16, that is, whether the hydraulic oil flows from the replenishing tank 11 into the upper chamber of the side cylinder 3, or the hydraulic oil flows from the upper chamber of the side cylinder 3 into the replenishing tank 11; when the fast cylinder 2 is in the fast downward state and the fast return state, the movement of the gantry scissors 1 drives the movement of the side cylinder 3, and the negative pressure generated in the upper chamber or lower chamber of the side cylinder 3 will drive the filling valve 13 to work, and the oil in the replenishing tank 11 is sucked into the replenishing oil circuit 12 through the oil circuit and the filling valve 13. Under the action of negative pressure, the oil in the replenishing oil circuit 12 enters the upper chamber or lower chamber of the side cylinder 3, and together with the oil discharged from the other chamber of the side cylinder 3, it makes up for the negative pressure chamber of the side cylinder 3. The upper and lower chambers of the side cylinder 3 are always kept full of oil to prevent air from entering the lower chamber of the side cylinder 3 and the pipeline. When the fast cylinder 2 is in the fast descending state and the fast returning state, the oil and liquid in the upper and lower chambers of the side cylinder 3 are complemented, while reducing the amount of oil replenished by the liquid replenishing tank 11 and the filling valve 13 to the upper and lower chambers of the side cylinder 3, which can reduce the diameter of the side cylinder oil replenishing and draining flushing valve 13.

[0036] A further optimized solution is provided, the oil outlet pipeline includes a first oil outlet pipeline 14, a second oil outlet pipeline 15 and a liquid replenishing oil pipeline 12, the first oil circuit 6 and the third oil circuit 8 are respectively connected to the first oil outlet pipeline 14, and the second oil circuit 7 and the fourth oil circuit 9 are respectively connected to the second oil outlet pipeline 15; a third on-off valve assembly is provided on the first oil outlet pipeline 14, and a fourth on-off valve assembly is provided on the second oil outlet pipeline 15. The main oil ports B of the cartridge valves inside the third on-off valve assembly and the fourth on-off valve assembly are both connected to the system oil return port 5; a ninth solenoid reversing valve 39 is provided on the charging valve control pipeline 16, and a first passage is provided inside the ninth solenoid reversing valve 39. One end of the first passage is connected to the charging valve control pipeline 16, and the other end of the first passage is connected to the system oil return port 5 or the system oil supply port 4. Based on the working state of the ninth solenoid reversing valve 39, the charging valve control pipeline 16 is controlled to be connected to one of the system oil return port 5 or the system oil supply port 4. In this embodiment, the oil outlet pipelines are separately provided, namely the first oil outlet pipeline 14, the second oil outlet pipeline 15 and the fluid replenishing oil pipeline 12. The first oil outlet pipeline 14 collects the hydraulic oil in the first oil circuit 6 and the third oil circuit 8, the second oil outlet pipeline 15 collects the hydraulic oil in the second oil circuit 7 and the fourth oil circuit 9, and the fluid replenishing oil pipeline 12 collects the excess hydraulic oil in the upper and lower chambers of the side cylinder 3. The opening and closing of the first oil outlet pipeline 14 is controlled by the third on-off valve assembly, thereby controlling whether the first oil outlet pipeline 14 is connected to the system oil return port 5. The opening and closing of the second oil outlet pipeline 15 is controlled by the fourth on-off valve assembly, thereby controlling whether the second oil outlet pipeline 15 is connected to the system oil return port 5. The working state of the filling valve control pipeline 16 is controlled by the ninth solenoid reversing valve 39, thereby controlling the flow direction of the hydraulic oil in the fluid replenishing oil circuit 12. In this embodiment, when the fast cylinder 2 is in a fast descending state, the hydraulic oil in the lower chamber of the fast cylinder 2 is discharged into the system oil return port 5 through the second oil circuit 7 and the second oil outlet pipeline 15. When the fast cylinder 2 is in a slow pressurizing state, the hydraulic oil in the lower chamber of the fast cylinder 2 is discharged into the system oil return port 5 through the second oil circuit 7 and the second oil outlet pipeline 15, and the hydraulic oil in the lower chamber of the side cylinder 3 is discharged into the system oil return port 5 through the fourth oil circuit 9 and the second oil outlet pipeline 15. When the fast cylinder 2 is in a slow return state, the hydraulic oil in the upper chamber of the fast cylinder 2 is discharged into the system oil return port 5 through the first oil circuit 6 and the first oil outlet pipeline 14, and the hydraulic oil in the upper chamber of the side cylinder 3 is discharged into the system oil return port 5 through the third oil circuit 8 and the first oil outlet pipeline 14, or the hydraulic oil in the upper chamber of the side cylinder 3 is discharged into the fluid replenishment tank 11 through the fluid replenishment oil circuit 12. When the fast cylinder 2 is in the fast return state, the hydraulic oil in the upper chamber of the fast cylinder 2 is discharged into the system return oil port 5 through the first oil circuit 6 and the first oil outlet pipeline 14. In some embodiments, the hydraulic oil inside the upper chamber of the side cylinder 3 enters the lower chamber of the side cylinder 3 through the fifth oil circuit 10, and the excess hydraulic oil is discharged into the replenishing tank 11 through the replenishing oil circuit 12.

[0037] In some embodiments, the fourth on-off valve assembly includes a fourth solenoid reversing valve 34 and a fourth cartridge valve 24. The fourth solenoid reversing valve 34 is a three-position four-way solenoid reversing valve. The P port of the fourth solenoid reversing valve 34 is connected to the control port C of the fourth cartridge valve 24. The A port and the B port of the fourth solenoid reversing valve 34 are respectively connected to the first relief valve 41 and the second relief valve 42. The setting pressure of the first relief valve 41 is greater than the setting pressure of the second relief valve 42. Therefore, when the hydraulic oil in the second oil outlet pipeline 15 reaches a certain pressure, the second oil outlet pipeline 15 can be connected to the system return oil port 5, and the hydraulic oil in the second oil outlet pipeline 15 can be discharged to the system return oil port In the port 5, it is ensured that the second oil outlet pipeline 15 has a certain pressure when the fast cylinder 2 is in the fast descending state and the slow pressurizing state, thereby ensuring that the second oil circuit 7 and the fourth oil circuit 9 (only in the slow pressurizing state) also continue to have a certain pressure, ensuring that when the gantry scissors 1 descends, the hydraulic oil in the lower chambers of the fast cylinder 2 and the side cylinder 3 (only in the slow pressurizing state) has a certain pressure, ensuring the stability of the gantry scissors 1 in the downward movement; at the same time, by controlling the set pressure of the first overflow valve 41 and the second overflow valve 42, and switching different workstations through the fourth electromagnetic reversing valve 34, the pressure of the hydraulic oil in the second oil outlet pipeline 15 is controlled to achieve pressure graded control.

[0038] In some embodiments, the second oil circuit 7 and the fourth oil circuit 9 are respectively connected to the first safety valve 43 and the second safety valve 44; the return oil ports of the first safety valve 43 and the second safety valve 44 are both connected to the system return oil port 5, which is used to control the pressure of the hydraulic oil inside the second oil circuit 7 and the fourth oil circuit 9, and protect the oil circuit safety of the second oil circuit 7 and the fourth oil circuit 9.

[0039] A further optimized solution is provided, in which the oil inlet pipeline includes a first oil inlet pipeline 17 and a second oil inlet pipeline 18. The first oil inlet pipeline 17 and the second oil inlet pipeline 18 are both connected to the system oil supply port 4, the first oil circuit 6 and the third oil circuit 8 are respectively connected to the first oil inlet pipeline 17, and the second oil circuit 7 and the fourth oil circuit 9 are respectively connected to the second oil inlet pipeline 18; a first on-off valve assembly is provided on the first oil inlet pipeline 17, and a second on-off valve assembly is provided on the second oil inlet pipeline 18. In this embodiment, the oil inlet pipeline is split into a first oil inlet pipeline 17 and a second oil inlet pipeline 18. Hydraulic oil with a certain pressure is provided to the first oil circuit 6 and the third oil circuit 8 through the first oil inlet pipeline 17, and hydraulic oil with a certain pressure is provided to the second oil circuit 7 and the fourth oil circuit 9 through the second oil inlet pipeline 18. The opening and closing of the first oil inlet pipeline 17 is controlled by the first on-off valve assembly, and the opening and closing of the second oil inlet pipeline 18 is controlled by the second on-off valve assembly. In this embodiment, when the fast cylinder 2 is in a fast descending state, hydraulic oil is supplied to the first oil circuit 6 through the first oil inlet pipeline 17; when the fast cylinder 2 is in a slow pressurizing state, hydraulic oil with a certain pressure is supplied to the first oil circuit 6 and the third oil circuit 8 at the same time through the first oil inlet pipeline 17; when the fast cylinder 2 is in a slow return state, hydraulic oil with a certain pressure is supplied to the second oil circuit 7 and the fourth oil circuit 9 at the same time through the second oil inlet pipeline 18; when the fast cylinder 2 is in a fast return state, hydraulic oil with a certain pressure is supplied to the second oil circuit 7 through the second oil inlet pipeline 18.

[0040] Preferably, the gantry shear control system further includes a one-way valve assembly. The on-off valve assembly on the fifth oil circuit 10 is an eighth on-off valve assembly, which includes an eighth solenoid reversing valve 38 and an eighth cartridge valve 28. The one-way valve assembly includes a second one-way valve 52, a third one-way valve 53, and a fourth one-way valve 54. The outlets of the second, third, and fourth one-way valves 52, 53, and 54 are connected to the P port of the eighth solenoid reversing valve 38. The inlet of the second one-way valve 52 is located at the end of the fifth oil circuit 10 near the lower chamber of the side cylinder 3. The inlet of the fourth one-way valve 54 is located at the end of the fifth oil circuit 10 near the upper chamber of the side cylinder 3. The inlet of the third one-way valve 53 is located at the end of the oil inlet pipeline near the system oil inlet. In this embodiment, the outlets of the second, third, and fourth one-way valves 52, 53, and 54 are connected to the P port of the eighth solenoid reversing valve 38, thereby jointly controlling the eighth cartridge valve 28. In a further optimization, the end of the oil inlet line near the system oil inlet is connected to the inlet of the first one-way valve 51. The outlet of the first one-way valve 51 is connected to the accumulator 55 and the inlet of the third one-way valve 53. During the operation of the entire control system, the accumulator 55 serves as an auxiliary oil source, ensuring that the eighth cartridge valve 28 can be closed reliably when needed.

[0041] As attached Figure 1-Figure 3As shown, a first on-off valve assembly is provided on the first oil inlet pipeline 17, a second on-off valve assembly is provided on the second oil inlet pipeline 18, a third on-off valve assembly is provided on the first oil outlet pipeline 14, a fourth on-off valve assembly is provided on the second oil outlet pipeline 15, a fifth on-off valve assembly is provided on the third oil circuit 8, a sixth on-off valve assembly is provided on the second oil circuit 7, and a seventh on-off valve assembly is provided on the fourth oil circuit 9; the on-off valve assembly on the fifth oil circuit 10 is an eighth on-off valve assembly. In this embodiment, no on-off valve assembly is provided on the first oil circuit 6. The first on-off valve assembly includes a first cartridge valve 21 and a first solenoid reversing valve 31; the second on-off valve assembly includes a second cartridge valve 22 and a second solenoid reversing valve 32; the third on-off valve assembly includes a third cartridge valve 23 and a third solenoid reversing valve 33; the fourth on-off valve assembly includes a fourth cartridge valve 24 and a fourth solenoid reversing valve 34; the fifth on-off valve assembly includes a fifth cartridge valve 25 and a fifth solenoid reversing valve 35; the sixth on-off valve assembly includes a sixth cartridge valve 26 and a sixth solenoid reversing valve 36; the seventh on-off valve assembly includes a seventh cartridge valve 27 and a seventh solenoid reversing valve 37; and the eighth on-off valve assembly includes an eighth cartridge valve 28 and an eighth solenoid reversing valve 38. Among them, the first solenoid reversing valve 31, the second solenoid reversing valve 32, the third solenoid reversing valve 33, the fifth solenoid reversing valve 35, the seventh solenoid reversing valve 37, and the ninth solenoid reversing valve 39 are two-position, four-way solenoid reversing valves; the fourth solenoid reversing valve 34 is a three-position, four-way solenoid reversing valve, and the sixth solenoid reversing valve 36 is a two-position, three-way solenoid reversing valve. The first cartridge valve 21, the second cartridge valve 22, the third cartridge valve 23, the fourth cartridge valve 24, the fifth cartridge valve 25, the sixth cartridge valve 26, the seventh cartridge valve 27, and the eighth cartridge valve 28 are all two-way cartridge valves. The present invention provides pressure measuring points in each oil circuit for measuring the hydraulic oil pressure within each circuit. A manual shut-off valve is connected to the oil circuit between the first check valve 51 and the third check valve 53, and a throttle valve is connected to the oil circuit between the oil port A of the third solenoid reversing valve 33 and the control port C of the third cartridge valve 23.

[0042] When the fast cylinder 2 is in the rapid downward state, the first solenoid reversing valve 31 is energized, the first cartridge valve 21 is opened, the sixth solenoid reversing valve 36 is energized, the sixth cartridge valve 26 is opened, the fourth solenoid reversing valve 34 is energized and connected to the first relief valve 41, the fourth cartridge valve 24 is opened due to back pressure, the eighth solenoid reversing valve 38 is energized, and the eighth cartridge valve 28 is opened; the system pressure oil enters the upper chamber of the fast cylinder 2 through the first oil inlet line 17 (the first cartridge valve 21 is open) and the first oil line 6, and the hydraulic oil in the lower chamber of the fast cylinder 2 is discharged into the system oil return port 5 through the second oil line 7 (the sixth cartridge valve 26 is open) and the second oil outlet line 15 (the fourth cartridge valve 24 is opened due to back pressure). The hydraulic oil inside the lower chamber of the side cylinder 3 enters the upper chamber of the side cylinder 3 through the fifth oil line 10 (the eighth cartridge valve 28 is open).

[0043] When the fast cylinder 2 is in the slow pressurization state, the first solenoid reversing valve 31 is energized, the first cartridge valve 21 is opened, the sixth solenoid reversing valve 36 is energized, the sixth cartridge valve 26 is opened, the fourth solenoid reversing valve 34 is energized and connected to the second relief valve 42, the fourth cartridge valve 24 is opened with back pressure, the fifth solenoid reversing valve 35 is energized, the fifth cartridge valve 25 is opened, the seventh solenoid reversing valve 37 is energized, the seventh cartridge valve 27 is opened; the eighth solenoid reversing valve 38 is de-energized, and the system pressure oil passes through the first one-way valve 51 and the third one-way valve 53 to the eighth solenoid reversing valve 38, closing the eighth cartridge valve 28. The system pressure oil enters the upper chamber of the fast cylinder 2 through the first oil inlet line 17 (the first cartridge valve 21 is open) and the first oil circuit 6, and the hydraulic oil in the lower chamber of the fast cylinder 2 is discharged into the system return oil port 5 through the second oil circuit 7 (the sixth cartridge valve 26 is open) and the second oil outlet line 15 (the fourth cartridge valve 24 is opened with back pressure); the system pressure oil enters the upper chamber of the side cylinder 3 through the first oil inlet line 17 (the first cartridge valve 21 is open) and the third oil circuit 8 (the fifth cartridge valve 25 is open), and the hydraulic oil in the lower chamber of the side cylinder 3 is discharged into the system return oil port 5 through the fourth oil circuit 9 (the seventh cartridge valve 27 is open) and the second oil outlet line 15 (the fourth cartridge valve 24 is opened with back pressure).

[0044] Before the oil cylinder returns, the third electromagnetic reversing valve 33 is energized, the third cartridge valve 23 is opened, and the pressure oil in the upper chamber of the fast cylinder 2 and the upper chamber of the side cylinder 3 is relieved through the oil circuit. The opening speed of the third cartridge valve 23 can be adjusted by the throttle valve to adjust the pressure relief speed and prevent the equipment from impact.

[0045] When the fast cylinder 2 is in the slow return state, the second solenoid reversing valve 32 is energized, the second cartridge valve 22 is opened, the sixth solenoid reversing valve 36 is energized, the sixth cartridge valve 26 is opened, the seventh solenoid reversing valve 37 is energized, and the seventh cartridge valve 27 is opened; the third solenoid reversing valve 33 is energized, the third cartridge valve 23 is opened, the ninth solenoid reversing valve 39 is energized, the filling valve control pipeline 16 and the system oil supply port 4 are connected, the filling valve 13 is opened, the eighth solenoid reversing valve 38 is de-energized, and the system pressure oil passes through the first one-way valve 51 and the third one-way valve 53 to the eighth solenoid reversing valve 38, closing the eighth cartridge valve 28. The system pressure oil enters the lower chamber of the fast cylinder 2 through the second oil inlet line 18 (the second cartridge valve 22 is open) and the second oil circuit 7 (the sixth cartridge valve 26 is open), and the hydraulic oil in the upper chamber of the fast cylinder 2 is discharged into the system return oil port 5 through the first oil circuit 6 and the first oil outlet line 14 (the third cartridge valve 23 is open); the system pressure oil enters the lower chamber of the side cylinder 3 through the second oil inlet line 18 (the second cartridge valve 22 is open) and the fourth oil circuit 9 (the seventh cartridge valve 27 is open), and the hydraulic oil in the upper chamber of the side cylinder is discharged into the fluid replenishment tank 11 through the fluid replenishment oil circuit 12.

[0046] When the fast cylinder 2 is in the fast return state, the second electromagnetic reversing valve 32 is energized, the second cartridge valve 22 is opened, the sixth electromagnetic reversing valve 36 is energized, the sixth cartridge valve 26 is opened, the third electromagnetic reversing valve 33 is energized, the third cartridge valve 23 is opened, the eighth electromagnetic reversing valve 38 is energized, the eighth cartridge valve 28 is opened; the ninth electromagnetic reversing valve 39 is energized, the filling valve control pipeline 16 and the system oil supply port 4 are connected, and the system pressure oil is supplied through the second oil inlet pipeline 18 (the The second cartridge valve 22 is opened) and the second oil circuit 7 (the sixth cartridge valve 26 is opened) enters the lower chamber of the fast cylinder 2, and the hydraulic oil in the upper chamber of the fast cylinder 2 is discharged into the system return oil port 5 through the first oil circuit 6 and the first oil outlet pipeline 14 (the third cartridge valve 23 is opened); the hydraulic oil inside the upper chamber of the side cylinder 3 enters the lower chamber of the side cylinder 3 through the fifth oil circuit 10 (the eighth cartridge valve 28 is opened), and the excess hydraulic oil in the upper chamber of the side cylinder is discharged into the replenishing tank 11 through the replenishing oil circuit 12.

[0047] During the operation of the gantry shears, the fast cylinder 2 switches states in sequence from fast downward state to slow pressurization state to slow return state to fast return state, and then repeats the above process. The fast cylinder 2 and the two side cylinders 3 are fixed on the cutting head of the same gantry shears 1. The fast downward movement of the gantry shears 1 is achieved by oil injection through the upper chamber of the middle fast cylinder 2, and the two side cylinders 3 passively follow the downward movement. When the cutting head of the gantry shears 1 comes into contact with the shearing material, the eighth on-off valve assembly is closed, and oil is simultaneously injected into the upper chambers of the fast cylinder 2 and the side cylinder 3. The oil in the lower chambers of the fast cylinder 2 and the side cylinder 3 flows back to the oil tank through the pipeline to achieve large-tonnage shearing of the equipment. After the shearing of the material is completed, in order to prevent the cutter head from getting stuck, when the cutter head and the lower workbench are in the staggered interval, oil is simultaneously supplied to the lower chambers of the quick cylinder 2 and the side cylinder 3 to realize the function of vigorously lifting the cutter; when the cutter head and the lower workbench are separated, the oil inlet line of the lower chamber of the side cylinder 3 is closed, and the eighth on-off valve assembly is opened to connect the upper and lower chambers of the side cylinder 3, and the quick return of the cutter head is realized only through the oil supply of the lower chamber of the quick cylinder 2, and the two side cylinders passively move upward.

[0048] The description of the above embodiments is only used to help understand the method of this application and its core idea; at the same time, for those skilled in the art, according to the idea of ​​this application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as limiting the present application.

[0049] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0050] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0051] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A gantry shears control system for controlling the operation of a gantry shears (1), characterized in that: The invention comprises a fast cylinder (2), a side cylinder (3) and a control oil circuit, wherein the piston rods of the fast cylinder (2) and the side cylinder (3) are connected to the same side of the gantry scissors (1), and the piston rods of the fast cylinder (2) and the side cylinder (3) move synchronously; the control oil circuit comprises an oil inlet pipeline connected to the system oil supply port (4), an oil outlet pipeline connected to the system oil return port (5), a first oil circuit (6) connected to the upper chamber of the fast cylinder (2), a second oil circuit (7) connected to the lower chamber of the fast cylinder (2), a third oil circuit (8) connected to the upper chamber of the side cylinder (3), a fourth oil circuit (9) connected to the lower chamber of the side cylinder (3), and a fifth oil circuit (10) connected between the upper chamber and the lower chamber of the side cylinder (3); each oil circuit is provided with an on-off valve assembly for controlling the opening and closing of the oil circuit; The fast cylinder (2) includes a fast descending state, a slow pressurizing state, a slow return state and a fast return state: When the fast cylinder (2) is in a fast downward state, the first oil circuit (6) is connected to the oil inlet pipeline, the second oil circuit (7) is connected to the oil outlet pipeline, the fifth oil circuit (10) is in a conducting state, and the third oil circuit (8) and the fourth oil circuit (9) are in a closed state; When the fast cylinder (2) is in a fast return state, the second oil circuit (7) is connected to the oil inlet pipeline, the first oil circuit (6) is connected to the oil outlet pipeline, the fifth oil circuit (10) is in a conducting state, and the third oil circuit (8) and the fourth oil circuit (9) are in a closed state; When the fast cylinder (2) is in a slow pressurizing state, the first oil circuit (6) and the third oil circuit (8) are both connected to the oil inlet pipeline, the second oil circuit (7) and the fourth oil circuit (9) are both connected to the oil outlet pipeline, and the fifth oil circuit (10) is in a closed state; When the fast cylinder (2) is in a slow return state, the second oil circuit (7) and the fourth oil circuit (9) are both connected to the oil inlet pipeline, the first oil circuit (6) and the third oil circuit (8) are both connected to the oil outlet pipeline, and the fifth oil circuit (10) is in a closed state.

2. The gantry shear control system according to claim 1, characterized in that: The on-off valve assembly includes a cartridge valve and an electromagnetic reversing valve, the cartridge valve includes a main oil port A, a main oil port B and a control port C, the control port C is connected to the oil port A or the oil port B of the electromagnetic reversing valve; based on the control of the electromagnetic reversing valve, the passage between the main oil port A and the main oil port B of the cartridge valve is switched between an on state and an off state.

3. The gantry shear control system according to claim 2, characterized in that: The invention also includes a fluid replenishing tank (11), a fluid replenishing oil circuit (12) is connected between the fluid replenishing tank (11) and the upper chamber of the side cylinder (3), a fluid charging valve (13) is provided on the fluid replenishing oil circuit (12), and the fluid charging valve (13) is connected to a fluid charging valve control pipeline (16). Based on the working state of the fluid charging valve control pipeline (16), the flow direction of the hydraulic oil in the fluid replenishing oil circuit (12) is controlled.

4. The gantry shear control system according to claim 3, characterized in that: The oil outlet pipeline comprises a first oil outlet pipeline (14), a second oil outlet pipeline (15) and a fluid replenishing oil pipeline (12); the first oil pipeline (6) and the third oil pipeline (8) are respectively connected to the first oil outlet pipeline (14); the second oil pipeline (7) and the fourth oil pipeline (9) are respectively connected to the second oil outlet pipeline (15); a third on-off valve assembly is provided on the first oil outlet pipeline (14); a fourth on-off valve assembly is provided on the second oil outlet pipeline (15); the main oil ports B of the cartridge valves in the third on-off valve assembly and the fourth on-off valve assembly are both connected to the The system oil return port (5) is connected; a ninth electromagnetic reversing valve (39) is provided on the liquid filling valve control pipeline (16); a first passage is provided inside the ninth electromagnetic reversing valve (39); one end of the first passage is connected to the liquid filling valve control pipeline (16), and the other end of the first passage is connected to the system oil return port (5) or the system oil supply port (4); based on the working state of the ninth electromagnetic reversing valve (39), the liquid filling valve control pipeline (16) is controlled to be connected to one of the system oil return port (5) or the system oil supply port (4).

5. The gantry shear control system according to claim 4, characterized in that: The fourth on-off valve assembly comprises a fourth electromagnetic reversing valve (34) and a fourth cartridge valve (24). The fourth electromagnetic reversing valve (34) is a three-position four-way electromagnetic reversing valve. The P port of the fourth electromagnetic reversing valve (34) is connected to the control port C of the fourth cartridge valve (24). The A port and the B port of the fourth electromagnetic reversing valve (34) are respectively connected to the first overflow valve (41) and the second overflow valve (42). The setting pressure of the first overflow valve (41) is greater than the setting pressure of the second overflow valve (42).

6. The gantry shear control system according to claim 2, characterized in that: The oil inlet pipeline comprises a first oil inlet pipeline (17) and a second oil inlet pipeline (18); the first oil inlet pipeline (17) and the second oil inlet pipeline (18) are both connected to the system oil supply port (4); the first oil circuit (6) and the third oil circuit (8) are respectively connected to the first oil inlet pipeline (17); the second oil circuit (7) and the fourth oil circuit (9) are respectively connected to the second oil inlet pipeline (18); a first on-off valve assembly is provided on the first oil inlet pipeline (17); and a second on-off valve assembly is provided on the second oil inlet pipeline (18).

7. The gantry shear control system according to claim 2, characterized in that: It also includes a one-way valve assembly, the on-off valve assembly on the fifth oil circuit (10) is an eighth on-off valve assembly, the eighth on-off valve assembly includes an eighth electromagnetic reversing valve (38) and an eighth plug-in valve (28), the one-way valve assembly includes a second one-way valve (52), a third one-way valve (53) and a fourth one-way valve (54), the liquid outlet ends of the second one-way valve (52), the third one-way valve (53) and the fourth one-way valve (54) are connected and then connected to the P port of the eighth electromagnetic reversing valve (38), the liquid inlet end of the second one-way valve (52) is arranged at one end of the fifth oil circuit (10) close to the lower chamber of the side cylinder (3), the liquid inlet end of the fourth one-way valve (54) is arranged at one end of the fifth oil circuit (10) close to the upper chamber of the side cylinder (3), and the liquid inlet end of the third one-way valve (53) is arranged at one end of the oil inlet pipeline close to the system oil inlet.

8. The gantry shear control system according to claim 7, characterized in that: One end of the oil inlet pipeline close to the system oil inlet is connected to the liquid inlet of the first one-way valve (51), and the liquid outlet of the first one-way valve (51) is connected to the accumulator (55) and the liquid inlet of the third one-way valve (53).

9. The gantry shear control system according to claim 1, characterized in that: The second oil passage (7) and the fourth oil passage (9) are respectively connected to a first safety valve (43) and a second safety valve (44).

10. The gantry shear control system according to claim 1, characterized in that: There are two side cylinders (3), which are arranged on both sides of the fast cylinder (2).

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