Non-powered hydraulic system for tilting device

Abstract

The invention discloses a non-powered hydraulic system for a turning device, comprising an oil cylinder, a one-way throttle valve I, a one-way throttle valve II, a pressure measuring exhaust point, a plate-type manual ball valve, a pressure gauge switch, a threaded plug-in one-way valve I, a threaded plug-in one-way valve II, a threaded plug-in one-way valve III, a threaded plug-in one-way valve IV, a pressure gauge, a tubular ball valve, a plate-type ball valve, an accumulator, a pressure measuring exhaust line and an oil replenishment manual pump, wherein the one-way throttle valve I and the one-way throttle valve II are respectively connected to a bridge-type rectifying cut-off circuit composed of the threaded plug-in one-way valve I, the threaded plug-in one-way valve II, the threaded plug-in one-way valve III, the threaded plug-in one-way valve IV and the plate-type manual ball valve through a pipe joint and a pipeline. The invention utilizes the principle of a bridge-type rectifying cut-off circuit, so that the bidirectional liquid flow of the hydraulic circuit must pass through the plate-type manual ball valve, and the opening and closing of the plate-type manual ball valve can accurately control the on-off of the oil flow, so that the oil cylinder piston can be effectively locked within its stroke range.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic transmission and control, and in particular relates to a power-source-free hydraulic system for a turnover device. Background Art

[0002] Any hydraulic circuit is composed of some basic circuits. The basic circuit is composed of various components or accessories. The power source circuit is the most basic and indispensable part of the hydraulic system. However, ZL201110384734.0 passive locking hydraulic system invented a locking hydraulic circuit that does not require power supply, that is, in an electric field, the accurate positioning of the hydraulic cylinder piston is achieved. However, the passive locking hydraulic system has the following defects when it is used: (1) Under the action of F load, the cylinder piston moves up from the original position, and the hydraulic oil in the rod chamber and the oil tank is filled into the rodless chamber. The air enters the hydraulic system through the QQ air filter to open the SQ check valve. The hydraulic system is an open system and the hydraulic oil is easy to deteriorate. (2) During the upward movement of the cylinder piston, a certain negative pressure is formed in the rodless chamber. After the cylinder piston moves up from the original position to the position, the manual stop valve is locked to complete the positioning action. Under the action of W reverse pressure, the piston will move down a certain distance, resulting in rebound and inaccurate positioning. Summary of the invention

[0003] In order to solve the above problems existing in the prior art and in actual situations, the present invention provides a power-source-free hydraulic system for a turning device, which has accurate positioning and is a closed system.

[0004] The present invention is achieved by adopting the following technical solutions:

[0005] A non-powered hydraulic system for a turning device, comprising an oil cylinder, a one-way throttle valve I, a one-way throttle valve II, a pressure measuring exhaust point, a plate-type manual ball valve, a pressure gauge switch, a threaded plug-in one-way valve I, a threaded plug-in one-way valve II, a threaded plug-in one-way valve III, a threaded plug-in one-way valve IV, a pressure gauge, a tubular ball valve, a plate-type ball valve, an accumulator, a pressure measuring exhaust line and an oil replenishment manual pump, wherein the rodless chamber of the oil cylinder is connected to the one-way throttle valve I, and the rod chamber is connected to the pressure measuring exhaust point and the one-way throttle valve II through a pipe joint; the one-way throttle valve I, the one-way throttle valve III, the one-way throttle valve IV ... The flow valve II is connected to the bridge rectifier cut-off circuit composed of the threaded cartridge check valve I, the threaded cartridge check valve II, the threaded cartridge check valve III, the threaded cartridge check valve IV and the plate-type manual ball valve through pipe joints and pipelines respectively; the bridge rectifier cut-off circuit is connected to the pressure gauge switch, the tubular ball valve and the plate-type ball valve through pipe joints and pipelines respectively; the pressure gauge switch is connected to the pressure gauge, and the plate-type ball valve is connected to the accumulator; the pressure measuring exhaust line is connected to the pressure measuring exhaust point when measuring pressure, and the oil replenishing manual pump is connected to the tubular ball valve quick-change when filling oil.

[0006] Preferably, the connection end between the bridge rectifier cut-off circuit and the one-way throttle valve II is the B1 node, the connection end between the bridge rectifier cut-off circuit and the one-way throttle valve I is the A1 node, intermediate nodes H1 and P1 are provided between the A1 node and the B1 node, the P1 node is connected to the pressure gauge switch, the tubular ball valve, and the plate-type ball valve, the threaded cartridge one-way valve I connects the B1 node and the H1 node, the threaded cartridge one-way valve II connects the P1 node and the B1 node, the threaded cartridge one-way valve III connects the A1 node and the H1 node, the threaded cartridge one-way valve IV connects the P1 node and the A1 node, and a plate-type manual ball valve is provided to connect the H1 node and the P1 node.

[0007] Preferably, the accumulator is installed at one end of the P1 node of the threaded plug-in check valve II and the threaded plug-in check valve IV of the bridge rectifier cut-off circuit, and the back pressure side of the threaded plug-in check valve II and the threaded plug-in check valve IV faces the oil cylinder.

[0008] Preferably, the pressure measuring and exhaust point is at the highest point of the liquid level in the device.

[0009] Preferably, the pressure gauge is installed between the node P1 of the bridge rectifier cutoff loop and the accumulator.

[0010] The invention discloses a non-power source hydraulic system for a turning device, wherein a one-way throttle valve I, a one-way throttle valve II, a threaded cartridge one-way valve I, a threaded cartridge one-way valve II, a threaded cartridge one-way valve III, a threaded cartridge one-way valve IV, a plate-type manual ball valve, a pressure gauge switch, a pressure gauge, a tubular ball valve, a plate-type ball valve and an accumulator are connected to form a balanced oil supply circuit.

[0011] The threaded cartridge check valve I, the threaded cartridge check valve II, the threaded cartridge check valve III, the threaded cartridge check valve IV and the plate-type manual ball valve form a bridge rectifier cut-off circuit.

[0012] The rodless chamber and the rod chamber of the oil cylinder are connected in series with the plate-type manual ball valve through a bridge-type rectifier cut-off circuit, so that the opening and closing of the plate-type manual ball valve controls the locking and positioning of the oil cylinder piston at any position.

[0013] The rodless chamber and the rod chamber of the oil cylinder form a balanced oil supply circuit through a bridge rectifier cut-off circuit and an accumulator. Under the action of nitrogen pressure, the accumulator replenishes oil and pressurizes the rodless chamber of the oil cylinder to prevent the piston from moving downward and rebounding. The entire hydraulic system is a closed system.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] By utilizing the principle of bridge rectifier cut-off circuit, the bidirectional liquid flow in the hydraulic circuit must pass through the plate-type manual ball valve. The opening and closing of the plate-type manual ball valve can accurately control the on and off of the oil flow, so that the cylinder piston can be effectively locked within its stroke range.

[0016] The nitrogen pressure of the accumulator is used to replenish oil and pressurize the rodless chamber of the cylinder to prevent rebound and achieve accurate positioning.

[0017] The accumulator can also absorb the pressure oil discharged from the rodless chamber, compensating for the area difference between the rodless chamber and the rod chamber of the cylinder.

[0018] The entire hydraulic system is a closed system, which solves the problem of deterioration of air and hydraulic oil due to long-term contact, and also solves the problem of environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the principle of the hydraulic system without power source for the turning device of the present invention;

[0020] Figure 2 It is a schematic diagram of the assembly of the power-free hydraulic system for the turning device of the present invention. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is described in detail below with reference to the accompanying drawings.

[0022] Under the action of bidirectional external load, this hydraulic system uses the principle of bridge rectifier cut-off circuit to control the position of the hydraulic cylinder piston by only one plate-type manual ball valve, thus completing the hydraulic locking and accurate positioning function.

[0023] like Figure 1 , 2 As shown, this embodiment discloses a non-power source hydraulic system for a turning device, including an oil cylinder 1, a one-way throttle valve I2.1, a one-way throttle valve II2.2, a pressure measuring and exhausting point 3, a plate-type manual ball valve 4, a pressure gauge switch 5, a threaded one-way valve I6.1, a threaded one-way valve II6.2, a threaded one-way valve III6.3, a threaded one-way valve IV6.4, a pressure gauge 7, a tubular ball valve 8, a plate-type ball valve 9 and an accumulator 10. The one-way throttle valve I2.1 is connected to the rodless cavity of the oil cylinder 1, and the one-way throttle valve II2.2 is connected to the rod cavity of the oil cylinder 1. The one-way throttle valve I2.1 and the one-way throttle valve II2.2 are respectively connected to the bridge rectifier cut-off circuit composed of the threaded plug-in check valve I6.1, the threaded plug-in check valve II6.2, the threaded plug-in check valve III6.3, the threaded plug-in check valve IV6.4 and the plate-type manual ball valve 4, and the bridge rectifier cut-off circuit is connected to the pressure gauge switch 5, the pressure gauge 7, the tubular ball valve 8, the plate-type ball valve 9 and the accumulator 10 in sequence. The auxiliary parts are the pressure measuring exhaust line 11 and the oil replenishment manual pump 12. The oil cylinder 1 is provided with an oil cylinder rodless chamber and an oil cylinder rod chamber. The difference between the volume of the rodless chamber and the rod chamber of the oil cylinder 1 is about 1 / 3 of the effective volume of the accumulator 10.

[0024] System cycle process: In the initial state, all cylinders are retracted. First, fill the rod chamber of the cylinder with hydraulic oil and connect all the pipelines in the figure. Connect the oil replenishment pump 12 to the tubular ball valve 8, and open the plate-type manual ball valve 4, tubular ball valve 8 and plate-type ball valve 9. Use the oil replenishment pump 12 to inject oil into the system pipelines and components. Under no-load conditions, inject a certain amount of hydraulic oil. The pressure gauge reading is about 2 times the nitrogen filling pressure of the accumulator 10, and the tubular ball valve 8 and plate-type ball valve 9 are closed. The oil replenishment pump 12 is disconnected from the tubular ball valve 8. Connect the pressure measurement exhaust line 11 to the pressure measurement exhaust point 3, perform appropriate exhaust, and then open the plate-type ball valve 9.

[0025] The plate-type manual ball valve 4 is closed, and the system is in standby mode. According to the load and position requirements, the opening and closing of the plate-type manual ball valve 4 can realize the locking and positioning of the hydraulic cylinder piston at any position.

[0026] During the process of the hydraulic cylinder being extended under load, the pressure oil in the rod chamber of the cylinder enters the rodless chamber of the cylinder through the one-way throttle valve II 2.2, the threaded one-way valve I 6.1, the plate-type manual ball valve 4, the threaded one-way valve IV 6.4 and the one-way throttle valve I 2.1 in turn; since the cross-sectional area of ​​the rodless chamber is larger than that of the rod chamber, the hydraulic oil in the accumulator 10 enters the rodless chamber of the cylinder through the threaded one-way valve IV 6.4 and the one-way throttle valve I 2.1 in turn; at this time, the reading of the system pressure gauge 7 decreases as the cylinder is extended, and the minimum reading will not be less than the nitrogen charging pressure of the accumulator 10.

[0027] When the hydraulic cylinder retracts without load, the pressure oil in the rodless chamber of the hydraulic cylinder passes through the one-way throttle valve Ⅰ2.1, the threaded one-way valve Ⅲ6.3, and the plate-type manual ball valve 4 in turn, and is divided into two routes: one route enters the rod chamber of the cylinder through the threaded one-way valve Ⅱ6.2, and the one-way throttle valve Ⅱ2.2; the other route enters the accumulator through the plate-type ball valve 9. At this time, the reading of the system pressure gauge 7 rises with the retraction of the cylinder, and the maximum will not be greater than the initial state pressure value.

[0028] The invention discloses a non-powered hydraulic system for a turning device, which does not contain a closed control circuit of a hydraulic pump or a motor, that is, does not require a hydraulic source or a power source, and is energy-saving and environmentally friendly. The control circuit is clear and simple, has good processability, low manufacturing cost, and long service life. It solves the technical defects left by the passive locking hydraulic system of ZL201110384734.0. The locking positioning is accurate.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A non-powered hydraulic system for a turning device, characterized in that: It includes an oil cylinder, a one-way throttle valve I, a one-way throttle valve II, a pressure measuring and exhaust point, a plate-type manual ball valve, a pressure gauge switch, a threaded cartridge one-way valve I, a threaded cartridge one-way valve II, a threaded cartridge one-way valve III, a threaded cartridge one-way valve IV, a pressure gauge, a tubular ball valve, a plate-type ball valve, an accumulator, a pressure measuring and exhaust line and an oil replenishment manual pump. The rodless chamber of the oil cylinder is connected to the one-way throttle valve I, and the rod chamber is connected to the pressure measuring and exhaust point and the one-way throttle valve II through a pipe joint; the one-way throttle valve I and the one-way throttle valve II are respectively connected to the The bridge rectifier cut-off circuit composed of threaded cartridge check valve I, threaded cartridge check valve II, threaded cartridge check valve III, threaded cartridge check valve IV and plate-type manual ball valve is connected. The bridge rectifier cut-off circuit is connected to the pressure gauge switch, tubular ball valve and plate-type ball valve through pipe joints and pipelines respectively. The pressure gauge switch is connected to the pressure gauge, and the plate-type ball valve is connected to the accumulator; the pressure measuring exhaust line is connected to the pressure measuring exhaust point when measuring pressure, and the oil replenishment manual pump is connected to the tubular ball valve quick-change when filling oil; the bridge rectifier cut-off circuit is connected to the single The connection end of the one-way throttle valve II is the B1 node, the connection end of the bridge rectifier cut-off circuit and the one-way throttle valve I is the A1 node, intermediate nodes H1 and P1 are provided between the A1 node and the B1 node, the P1 node is connected to the pressure gauge switch, the tubular ball valve, and the plate ball valve, the threaded cartridge one-way valve I is connected to the B1 node and the H1 node, the threaded cartridge one-way valve II is connected to the P1 node and the B1 node, the threaded cartridge one-way valve III is connected to the A1 node and the H1 node, the threaded cartridge one-way valve IV is connected to the P1 node and the A1 node, and the H1 node is connected to the A plate-type manual ball valve is provided between the point and the P1 node; the accumulator is installed at one end of the P1 node of the threaded cartridge check valve II and the threaded cartridge check valve IV in the bridge rectifier cut-off circuit, and the back pressure side of the threaded cartridge check valve I faces the H1 node, the back pressure side of the threaded cartridge check valve II faces the B1 node, the back pressure side of the threaded cartridge check valve III faces the H1 node, and the back pressure side of the threaded cartridge check valve IV faces the A1 node; the pressure measuring and exhausting point is at the highest point of the liquid level of the device; the pressure gauge is installed between the P1 node of the bridge rectifier cut-off circuit and the accumulator.

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