Hydraulic system of crane pipe lifting oil cylinder

Abstract

The invention relates to a crane pipe lifting oil cylinder hydraulic system which comprises an oil storage tank, and hydraulic oil filtered by a filter circulates in the system. When a hydraulic system breaks down or is overloaded, the overflow valve opens a channel, liquid is allowed to flow back to an oil tank, and the system is prevented from being damaged or other parts are prevented from being overloaded. The double motors and the double pumps in the system can be switched to work, when one motor or pump breaks down, the other motor or pump works normally, and normal operation of the system is guaranteed. And the first hydraulic assembly and the second hydraulic assembly are selectively started and stopped, so that the two vertical pipes independently ascend and descend. And hydraulic oil flows back to the oil storage tank after entering the oil return pipeline along the first flow guide branch or the second flow guide branch through the first emergency cut-off valve and the second emergency cut-off valve. Hydraulic oil timely flows back to the liquid storage tank, leakage of heavy hydraulic oil of the system is avoided, the service life of equipment is prolonged, and the safety performance of the equipment is improved. The safety of equipment and workers is improved, and accidents are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of fluid loading and unloading equipment in the petroleum and petrochemical industries, and in particular to a crane pipe lifting cylinder hydraulic system. Background Art

[0002] The crane pipe lifting cylinder hydraulic system is a reliable and efficient working device, but it may also have some disadvantages. During the lifting process, a hydraulic system can only drive the lifting of one vertical pipe and cannot selectively control the lifting of multiple vertical pipes.

[0003] When an emergency occurs in the system and the hydraulic oil supply needs to be blocked, the oil supply cannot be blocked in time, and when the oil supply is blocked, the hydraulic oil in the oil supply pipeline cannot efficiently flow back to the oil storage tank, causing hydraulic oil leakage, sudden pressure rise, and difficulty in control, resulting in energy loss and reducing the efficiency of the entire system. Summary of the invention

[0004] The purpose of the present invention is to provide a crane pipe lifting cylinder hydraulic system to solve the problems raised in the above-mentioned background technology. The present invention has the advantages of selective starting and stopping of the first hydraulic component and the second hydraulic component to complete the lifting and lowering of the corresponding vertical pipe, and can urgently cut off the first electromagnetic reversing valve or the second electromagnetic reversing valve. The hydraulic oil in the liquid supply pipeline can overflow from the first diversion branch, the second diversion branch and the overflow valve respectively.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a crane pipe lifting cylinder hydraulic system, including an oil storage tank, the oil storage tank is provided with an oil supply pipeline and an oil return pipeline extending into the oil storage tank, the oil supply pipeline includes a first oil circuit and a second oil circuit connected in parallel, the first oil circuit is provided with a first oil pump, a filter, and a throttle valve in sequence along the oil outlet direction, a first motor is connected to one side of the first oil pump, an overflow pipeline extending into the oil storage tank is provided between the first oil pump and the filter, an overflow valve is provided on the overflow pipeline, the second oil circuit is provided with a second oil pump and a second motor in sequence along the oil outlet direction, and a second one-way stop valve is provided on the oil supply pipeline between the second oil pump and the overflow valve; the overflow valve can play a protective role in overload or abnormal conditions in the hydraulic system. During the circulation of the hydraulic oil filtered by the filter in the system, impurities will not remain in the first oil pump and the hydraulic cylinder, thereby improving the overall service life of the system. When the hydraulic system fails or is overloaded, the overflow valve will open the channel to allow the liquid to flow back to the oil tank to prevent system damage or overload of other components. The system is equipped with dual motors and dual pumps. The dual motors and dual pumps can switch between working modes. When one set of motors or pumps fails, the other set of motors and pumps can work normally to ensure the normal operation of the system.

[0006] A first branch and a second branch are provided in parallel on the oil supply pipeline, a third branch and a fourth branch are provided in parallel on the oil return pipeline, a first hydraulic component is provided between the first branch and the third branch, a normally open first emergency shut-off valve and a first stop valve are provided in sequence along the liquid inlet direction on the first branch, a second hydraulic component is provided between the second branch and the fourth branch, and a normally open second emergency shut-off valve and a second stop valve are provided in sequence along the liquid inlet direction on the second branch; the first stop valve and the second stop valve are configured to determine the selective start and stop of the first hydraulic component and the second hydraulic component to complete the lifting and lowering of the corresponding vertical pipe.

[0007] A first flow diversion branch is connected in parallel between the throttle valve and the first emergency shut-off valve, a second flow diversion branch is connected in parallel on the oil supply pipeline between the first branch and the second branch, and both the first flow diversion branch and the second flow diversion branch are connected to the oil return pipeline; the first emergency shut-off valve and the second emergency shut-off valve improve the safety of equipment and workers and reduce the occurrence of accidents.

[0008] The first motor drives the first oil pump to work, and the hydraulic oil in the oil storage tank is output along the oil supply pipeline, filtered by the filter, and then enters the throttle valve. The first hydraulic component or / and the second hydraulic component are selected to be started according to needs, and the first electromagnetic reversing valve and the second reversing valve are used to drive the lifting and lowering of the first drop pipe and the lifting and lowering of the second drop pipe respectively. When encountering an emergency, the first emergency cut-off valve and the second emergency cut-off valve are urgently cut off, and the hydraulic oil enters the return oil pipeline along the first diversion branch or the second diversion branch respectively, and then flows back to the oil storage tank. When the hydraulic oil is blocked, it can flow back to the liquid storage tank in time to avoid leakage of the heavy hydraulic oil of the system, extend the service life of the equipment, and improve the safety performance of the equipment.

[0009] The oil return pipeline is provided with an oil return valve, an oil return flowmeter and an oil return filter in sequence along the oil return direction. The oil return filter effectively filters impurities such as solid particles, metal chips, dust, etc. in the hydraulic oil to prevent these impurities from entering the machine, reducing the wear and failure of machine parts. The oil return filter also filters impurities in the hydraulic oil, protects various components of the hydraulic system, extends the service life of the machine, and improves the reliability and stability of the machine. Clean hydraulic oil can reduce friction resistance, improve the working efficiency of the machine, reduce energy consumption, and also help maintain the normal operation of the machine.

[0010] As a further solution of the present invention, the first hydraulic assembly includes a first electromagnetic reversing valve and a first hydraulic cylinder, the push rod of the first hydraulic cylinder is connected to a first drop pipe on the crane pipe, and the second hydraulic assembly includes a second electromagnetic reversing valve and a second hydraulic cylinder, the push rod of the second hydraulic cylinder is connected to a second drop pipe on the crane pipe. The push rod of the first hydraulic cylinder directly acts on the drop pipe, driving the drop pipe to synchronously perform lifting and lowering movements, and the start and stop positions of the drop pipe can be flexibly adjusted to improve work efficiency.

[0011] As a further solution of the present invention, the first solenoid reversing valve includes interface A, interface B, interface C, and interface D, the first hydraulic cylinder includes port a and port b, port a is connected to the rodless chamber of the first hydraulic cylinder, port b is connected to the rod chamber of the first hydraulic cylinder, the first branch is connected to interface C, interface C is connected to port b, the third branch is connected to interface D, and interface D is connected to port a, driving the piston of the first hydraulic cylinder to retract and complete the lifting movement of the first vertical pipe.

[0012] As a further solution of the present invention, the first branch is connected to interface A, which is connected to port a, the third branch is connected to interface B, which is connected to port b, driving the piston of the first hydraulic cylinder to extend and completing the first drop pipe to descend, and the third branch is provided with a third oil return valve and a third oil return check valve in sequence along the oil outlet direction. The third oil return valve is opened or closed in time to ensure the normal operation of the system, and the third oil return check valve is provided to ensure that the hydraulic oil does not flow back.

[0013] As a further solution of the present invention, the second solenoid reversing valve includes interface E, interface F, interface H, and interface I, the second hydraulic cylinder includes port e and port f, port e is connected to the rodless chamber of the second hydraulic cylinder, port f is connected to the rod chamber of the second hydraulic cylinder, the second branch is connected to interface H, interface H is connected to port f, the fourth branch is connected to interface I, interface I is connected to port e, driving the piston of the second hydraulic cylinder to retract, completing the lifting movement of the second vertical pipe.

[0014] As a further solution of the present invention, the second branch is connected to the interface E, which is connected to the e port, the fourth branch is connected to the interface F, which is connected to the f port, driving the piston of the second hydraulic cylinder to extend and complete the second drop pipe to descend, and the fourth branch is provided with a fourth oil return valve and a fourth oil return check valve in sequence along the oil outlet direction. The fourth oil return valve is opened or closed in time to ensure the normal operation of the system, and the fourth oil return check valve is provided to ensure that the hydraulic oil does not flow back.

[0015] As a further solution of the present invention, the first stop valve and the second stop valve are opened simultaneously, and the first hydraulic component and the second hydraulic component are started simultaneously;

[0016] The first stop valve is opened, the second stop valve is closed, and the first hydraulic assembly is started to drive the first drop pipe to move up and down;

[0017] The second stop valve is opened, the first stop valve is closed, and the second hydraulic assembly is started to drive the second vertical pipe to perform lifting motion.

[0018] As a further solution of the present invention, a first accumulator is provided on the oil supply pipeline between the first flow diversion shunt and the first branch, a first oil guide valve and a first oil guide check valve are sequentially provided on the first flow diversion shunt along the oil outlet direction, a second accumulator is provided on the oil supply pipeline between the second flow diversion shunt and the second branch, and a second oil guide valve and a second oil guide check valve are sequentially provided on the second flow diversion shunt along the oil outlet direction. The first accumulator and the second accumulator balance the energy supply and demand of the hydraulic system, improve the efficiency and flexibility of the system, make the hydraulic system more stable and reliable in an emergency, and meet the power requirements of normal operation. The first oil guide valve and the second oil guide valve are opened in time to avoid excessive oil pressure in the oil supply pipeline when the system fails, and to release the pressure in time. During the oil drainage process, the first oil guide check valve and the second oil guide check valve ensure the unidirectional output of the hydraulic oil without backflow.

[0019] As a further solution of the present invention, a first one-way stop valve is provided on the oil supply pipeline between the first oil pump and the overflow valve, and the dual motor and dual pump configuration ensures that when one set of motors or pumps fails, the other set of motors and pumps will work to ensure the normal operation of the system.

[0020] The oil storage tank is provided with a float level gauge and a level sensor, and the level gauge detects the level of the hydraulic oil in the oil storage tank in real time.

[0021] Compared with the prior art, the beneficial effects of the present invention are: in the system, by providing a filter, the filtered hydraulic oil will not leave impurities in the first oil pump and the hydraulic cylinder during the circulation of the system, thereby improving the overall service life of the system. When the hydraulic system fails or is overloaded, the overflow valve will open the channel to allow the liquid to flow back to the tank to prevent system damage or overload of other components.

[0022] The first stop valve and the second stop valve are used to determine the selective start and stop of the first hydraulic component and the second hydraulic component to complete the lifting and lowering of the corresponding vertical pipe, so that the two vertical pipes can be independently lifted and lowered.

[0023] The first emergency shut-off valve and the second emergency shut-off valve improve the safety of equipment and workers and reduce the occurrence of accidents.

[0024] When encountering an emergency, the first emergency shut-off valve and the second emergency shut-off valve are shut off, and the hydraulic oil enters the return oil pipeline along the first diversion branch or the second diversion branch respectively, and then flows back to the oil storage tank. When the hydraulic oil is blocked, it can flow back to the liquid storage tank in time, avoiding the leakage of the system's heavy hydraulic oil, extending the service life of the equipment, and improving the safety performance of the equipment.

[0025] The first accumulator and the second accumulator are arranged in the system to balance the energy supply and demand of the hydraulic system, improve the efficiency and flexibility of the system, make the hydraulic system more stable and reliable in emergency situations, and meet the power requirements of normal operation.

[0026] The system is equipped with dual motors and dual pumps. The dual motors and dual pumps can switch between working modes. When one set of motors or pumps fails, the other set of motors and pumps can work normally to ensure the normal operation of the system.

[0027] The return oil pipeline is equipped with a return oil valve, a return oil flow meter and a return oil filter in the return oil direction to effectively filter out solid particles, metal chips, dust and other impurities in the hydraulic oil, prevent these impurities from entering the machine, and reduce the wear and failure of machine parts. The return oil filter also filters impurities in the hydraulic oil and protects various components of the hydraulic system, extending the service life of the machine and improving the reliability and stability of the machine. Clean hydraulic oil can reduce friction resistance, improve the working efficiency of the machine, reduce energy consumption, and also help maintain the normal operation of the machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The system status of the present invention is shown in FIG. Figure 1 ;

[0029] Figure 2 The system status of the present invention is shown in FIG. Figure 2 .

[0030] In the figure: 1- oil storage tank, 101- overflow pipeline, 102- oil supply pipeline, 103- first branch, 104- third branch, 141- third oil return valve, 142- third oil return check valve, 105- second branch, 106- fourth branch, 161- fourth oil return valve, 162- fourth oil return check valve, 107- second flow diversion branch, 108- oil return pipeline, 109- first flow diversion branch, 191- first oil guide valve, 192- first oil guide check valve, 2- overflow valve, 3- filter, 4- throttle valve, 5- -The first emergency shut-off valve, 6-the first stop valve, 7-the first solenoid reversing valve, 8-the first hydraulic cylinder, 9-the second hydraulic cylinder, 10-the second solenoid reversing valve, 11-the second stop valve, 12-the second emergency shut-off valve, 13-the first motor, 14-the first oil pump, 15-the first one-way shut-off valve, 16-the first accumulator, 17-the second accumulator, 171-the second oil guide valve, 172-the second oil guide one-way valve, 18-the return oil filter, 181-the return oil valve, 182-the return oil flow meter, 19-the float level gauge. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Please see attached Figure 1-2 A crane pipe lifting cylinder hydraulic system includes an oil storage tank 1, on which a float level gauge 19 and a level sensor are provided. The float level gauge 19 detects the level of the hydraulic oil in the oil storage tank in real time, transmits the level signal to the system through the level sensor, and monitors that the level is in a stable state.

[0033] The oil storage tank is provided with an oil supply pipeline 102 and an oil return pipeline 108 extending into the oil storage tank. The oil supply pipeline includes a first oil circuit and a second oil circuit connected in parallel. The first oil circuit is provided with a first oil pump 14, a filter 3, and a throttle valve 4 in sequence along the oil outlet direction. A first motor 13 is connected to one side of the first oil pump. The first motor starts to drive the first oil pump to deliver hydraulic oil to the oil supply pipeline. An overflow pipeline 101 extending into the oil storage tank is provided between the first oil pump and the filter. An overflow valve 2 is provided on the overflow pipeline; the overflow valve limits the pressure in the hydraulic system to not exceed the set value. When the system pressure exceeds the set value, the overflow valve will open the channel and guide the excess liquid back to the oil tank to keep the system pressure within a safe range. A first one-way stop valve 15 is provided on the oil supply pipeline between the first oil pump and the overflow valve. The first one-way stop valve prevents the hydraulic oil from flowing back into the first oil pump.

[0034] The second oil circuit is provided with a second oil pump and a second motor in sequence along the oil outlet direction, and a second one-way stop valve is provided on the oil supply pipeline between the second oil pump and the overflow valve 2;

[0035] In normal working state, the first one-way stop valve and the second one-way stop valve are opened at the same time, and the first oil pump and the second oil pump can switch to provide hydraulic oil supply to the system.

[0036] A first branch 103 and a second branch 105 are provided in parallel on the oil supply pipeline, a third branch 104 and a fourth branch 106 are provided in parallel on the oil return pipeline, a first hydraulic component is provided between the first branch and the third branch, a normally open first emergency shut-off valve 5 and a first stop valve 6 are provided in sequence along the liquid inlet direction on the first branch, the first hydraulic component includes a first solenoid reversing valve 7 and a first hydraulic cylinder 8, and a push rod of the first hydraulic cylinder is connected to a first vertical pipe on the crane pipe.

[0037] A second hydraulic assembly is provided between the second branch 105 and the fourth branch 106, and a normally open second emergency shut-off valve 12 and a second stop valve 11 are provided in sequence along the liquid inlet direction of the second branch; the second hydraulic assembly includes a second electromagnetic reversing valve 10 and a second hydraulic cylinder 9, and the push rod of the second hydraulic cylinder is connected to the second vertical pipe on the crane pipe.

[0038] A first flow branch 109 is connected in parallel between the throttle valve and the first emergency shut-off valve, a second flow branch 107 is connected in parallel on the oil supply pipeline between the first branch 103 and the second branch 105, and both the first flow branch and the second flow branch are connected to the oil return pipeline;

[0039] The first motor drives the first oil pump to work, and the hydraulic oil in the oil storage tank is output along the oil supply pipeline, filtered by the filter, and then enters the throttle valve 4. The first hydraulic component or / and the second hydraulic component are selected to be started according to needs, and the first electromagnetic reversing valve and the second reversing valve are used to drive the lifting and lowering of the first drop pipe and the lifting and lowering of the second drop pipe respectively. When encountering an emergency, the first emergency cut-off valve 5 and the second emergency cut-off valve 12 are urgently cut off, and the hydraulic oil enters the return oil pipeline along the first diversion branch or the second diversion branch respectively, and then flows back to the oil storage tank through the return pipeline. Among them, the second diversion branch is used as a standby branch. When the first diversion branch is operating normally, the second diversion branch is in a long-closed standby state.

[0040] The return oil pipeline is provided with a return oil valve 181, a return oil flow meter 182 and a return oil filter 18 in sequence along the return oil direction. Under normal conditions, the return oil valve is in a normally open state, and the hydraulic oil flows back along the return oil pipeline. The return oil flow meter detects the return oil volume in real time, thereby controlling the opening of the return oil valve. The return oil filter filters the return hydraulic oil and returns it to the oil storage tank. In an emergency, close the return oil valve to keep the system in a safe state.

[0041] Example 1

[0042] The first stop valve 6 and the second stop valve 11 are opened at the same time, and the first hydraulic component and the second hydraulic component are started at the same time; when the system is normal, the first emergency shut-off valve and the second emergency shut-off valve are in a normally open state.

[0043] The first electromagnetic reversing valve 7 includes interface A, interface B, interface C, and interface D. The first hydraulic cylinder includes port a and port b. Port a is connected to the rodless chamber of the first hydraulic cylinder 8, and port b is connected to the rod chamber of the first hydraulic cylinder. The first branch 103 is connected to interface C, and interface C is connected to port b. The third branch 104 is connected to interface D, and interface D is connected to port a. The hydraulic oil enters the rod chamber of the first hydraulic cylinder from port b, driving the piston of the first hydraulic cylinder to retract, thereby completing the lifting movement of the first vertical pipe.

[0044] The second electromagnetic reversing valve 10 includes interface E, interface F, interface H, and interface I. The second hydraulic cylinder includes port e and port f. Port e is connected to the rodless chamber of the second hydraulic cylinder 9, and port f is connected to the rod chamber of the second hydraulic cylinder. The second branch 105 is connected to interface H, and interface H is connected to port f. The fourth branch is connected to interface I, and interface I is connected to port e. The hydraulic oil enters the rod chamber of the first hydraulic cylinder 8 from port f, driving the piston of the second hydraulic cylinder to retract, thereby completing the lifting movement of the second vertical pipe.

[0045] Example 2

[0046] The first stop valve 6 and the second stop valve 11 are opened at the same time, and the first hydraulic component and the second hydraulic component are started at the same time; when the system is normal, the first emergency shut-off valve 5 and the second emergency shut-off valve 12 are in a normally open state.

[0047] The first branch 103 is connected to the interface A, which is connected to the a port, and the third branch is connected to the interface B, which is connected to the b port, driving the piston of the first hydraulic cylinder 8 to extend and complete the first drop pipe to descend. The third branch is provided with a third oil return valve 141 and a third oil return check valve 142 in sequence along the oil outlet direction. The third oil return valve 141 is opened or closed in time to ensure the normal operation of the system. The third oil return check valve 142 is opened, and during the oil return process, the hydraulic oil flows in one direction.

[0048] The second branch 105 is connected to the interface E, which is connected to the e port, and the fourth branch is connected to the interface F, which is connected to the f port, driving the piston of the second hydraulic cylinder 9 to extend and complete the second drop pipe to descend. The fourth branch is provided with a fourth oil return valve 161 and a fourth oil return check valve 162 in sequence along the oil outlet direction. The fourth oil return valve 161 is opened or closed in time to ensure the normal operation of the system. The fourth oil return check valve 162 is opened, and during the oil return process, the hydraulic oil flows in one direction.

[0049] Example 3

[0050] The first stop valve 6 and the second stop valve 11 are opened at the same time, and the first hydraulic component and the second hydraulic component are started at the same time; when an emergency occurs in the system, the first emergency shut-off valve 5 and the second emergency shut-off valve 12 are immediately closed, and oil supply to the first hydraulic component and the second hydraulic component is prohibited.

[0051] The hydraulic oil in the oil supply pipeline enters the oil return pipeline 108 along the first flow branch 109 and the second flow branch 107 respectively, and then flows back to the oil storage tank 1. The hydraulic oil in the oil supply pipeline upstream of the first emergency shutoff valve and the second emergency shutoff valve flows back to the oil storage tank 1 through the overflow valve 2.

[0052] Example 4

[0053] The first stop valve 6 is opened, the second stop valve 11 is closed, and the first hydraulic assembly is started to drive the first drop pipe to move up and down;

[0054] When the first vertical pipe needs to perform a lifting movement, the first branch 103 is connected to the interface C of the first electromagnetic reversing valve, the interface C is connected to the b port, the third branch 104 is connected to the interface D of the first electromagnetic reversing valve, the interface D is connected to the a port, the hydraulic oil enters the rod chamber of the first hydraulic cylinder from the b port, drives the piston of the first hydraulic cylinder 8 to retract, and completes the lifting movement of the first vertical pipe.

[0055] When the first drop pipe needs to make a descending movement, the first branch 103 is connected to the interface A, the interface A is connected to the a port, the third branch 104 is connected to the interface B, the interface B is connected to the b port, the piston of the first hydraulic cylinder is driven to extend, and the first drop pipe is completed to make a descending movement. The third branch is provided with a third oil return valve and a third oil return check valve in sequence along the oil outlet direction.

[0056] Example 5

[0057] When the second drop pipe needs to be lifted, the second stop valve 11 is opened, the first stop valve 6 is closed, and the second hydraulic assembly is started to drive the second drop pipe to perform lifting motion.

[0058] The e port of the second hydraulic cylinder is connected to the rodless chamber of the second hydraulic cylinder, the f port is connected to the rod chamber of the second hydraulic cylinder, the second branch 105 is connected to the interface H, the interface H is connected to the port, the fourth branch is connected to the interface I, the interface I is connected to the e port, driving the piston of the second hydraulic cylinder 9 to retract and complete the lifting movement of the second vertical pipe.

[0059] When the second drop pipe needs to make a descending movement, the second branch 105 is connected to the interface E, the interface E is connected to the e port, the fourth branch 106 is connected to the interface F, the interface F is connected to the f port, the piston of the second hydraulic cylinder 9 is driven to extend, and the second drop pipe is completed to make a descending movement. The fourth branch is provided with a fourth oil return valve and a fourth oil return check valve in sequence along the oil outlet direction.

[0060] Example 6

[0061] The first stop valve 6 is opened, the second stop valve 11 is closed, and the first hydraulic component is started, or the second stop valve is opened, the first stop valve 6 is closed, and the second hydraulic component is started;

[0062] When an emergency occurs in the system, the first emergency shut-off valve 5 and the second emergency shut-off valve 12 are immediately closed, and oil supply to the first hydraulic assembly or the second hydraulic assembly is prohibited.

[0063] The hydraulic oil in the oil supply pipeline enters the oil return pipeline along the first flow branch 109 or the second flow branch 107, and then flows back to the oil storage tank 1. The hydraulic oil in the oil supply pipeline upstream of the first emergency shut-off valve 5 and the second emergency shut-off valve 12 flows back to the oil storage tank 1 through the overflow valve.

[0064] Example 7

[0065] A first accumulator 16 is provided on the oil supply pipeline between the first flow diversion path and the first branch, a first accumulator valve is provided on the pipeline connecting the first accumulator 16 with the oil supply pipeline, a first oil guide valve 191 and a first oil guide check valve 192 are provided in sequence along the oil outlet direction of the first flow diversion path, a second accumulator 17 is provided on the oil supply pipeline between the second flow diversion path and the second branch, a second accumulator valve is provided on the pipeline connecting the second accumulator 17 with the oil supply pipeline, and a second oil guide valve 171 and a second oil guide check valve 172 are provided in sequence along the oil outlet direction of the second flow diversion path. Under normal conditions, the first oil guide valve and the second oil guide valve are in a closed state.

[0066] The first energy storage valve and the second energy storage valve are in a closed state, the second energy storage device serves as a backup energy storage device, and the first energy storage device supplies energy to the first hydraulic cylinder and the second hydraulic cylinder.

[0067] In case of temporary power outage or emergency, when the energy storage capacity in the first energy storage device is insufficient, the second energy storage valve is opened and the second energy storage device supplies energy, providing continuous pressure to the system and retracting the crane pipe or maintaining its original state.

[0068] In this state, the first oil guide valve is opened in time to prevent excessive oil pressure in the oil supply pipeline when the system fails, and to release the pressure in time. At the same time, the first oil guide check valve is opened to ensure that the hydraulic oil is output in one direction during the oil drainage process without backflow.

[0069] When the first oil guide valve is damaged or cannot be opened normally, the oil pressure in the oil supply pipeline is too high when the system fails, and the pressure is released in time. The second oil guide valve is opened in time, and the second oil guide check valve is opened at the same time to ensure that the hydraulic oil is output in one direction during the oil drainage process without backflow.

[0070] Example 8

[0071] When the first oil pump or the first motor fails, a first one-way stop valve is provided on the oil supply pipeline between the first oil pump and the overflow valve, and the first one-way stop valve is closed.

[0072] The second oil circuit is provided with a second oil pump and a second motor in sequence along the oil outlet direction, and a second one-way stop valve is provided on the oil supply pipeline between the second oil pump and the overflow valve. When the second one-way stop valve is opened, the second oil pump and the second motor start working, and the system continues to maintain the original oil supply state, and the oil supply of the entire system is not affected by the fault.

[0073] When the second oil pump or the second motor fails, the second one-way stop valve is closed.

[0074] The first one-way stop valve opens, the first oil pump and the first motor start working, and the system continues to maintain the original oil supply state, and the oil supply of the entire system is not affected by the fault.

[0075] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0076] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A crane pipe lifting cylinder hydraulic system, characterized in that: The invention comprises an oil storage tank (1), on which an oil supply pipeline (102) and an oil return pipeline (108) extending into the oil storage tank are provided, the oil supply pipeline comprising a first oil circuit and a second oil circuit connected in parallel, the first oil circuit being provided with a first oil pump (14), a filter (3) and a throttle valve (4) in sequence along the oil outlet direction, a first motor (13) being connected to one side of the first oil pump, an overflow pipeline (101) extending into the oil storage tank being provided between the first oil pump and the filter, an overflow valve (2) being provided on the overflow pipeline, a second oil pump and a second motor being provided in sequence along the oil outlet direction, and a second one-way stop valve being provided on the oil supply pipeline between the second oil pump and the overflow valve (2); A first branch (103) and a second branch (105) are provided in parallel on the oil supply pipeline, a third branch (104) and a fourth branch (106) are provided in parallel on the oil return pipeline, a first hydraulic assembly is provided between the first branch and the third branch, a normally open first emergency shut-off valve (5) and a first stop valve (6) are provided in sequence along the liquid inlet direction on the first branch, a second hydraulic assembly is provided between the second branch and the fourth branch, and a normally open second emergency shut-off valve (12) and a second stop valve (11) are provided in sequence along the liquid inlet direction on the second branch; A first flow guide branch (109) is connected in parallel between the throttle valve and the first emergency shut-off valve, a second flow guide branch (107) is connected in parallel to the oil supply pipeline between the first branch and the second branch, and both the first flow guide branch and the second flow guide branch are connected to the oil return pipeline; The first motor drives the first oil pump (14) to work, and the hydraulic oil in the oil storage tank is output along the oil supply pipeline, filtered by the filter, and then enters the throttle valve. The first hydraulic component or / and the second hydraulic component are selectively started according to needs, and the first electromagnetic reversing valve and the second reversing valve are used to switch the first drop pipe and the second drop pipe respectively. When an emergency situation occurs, the first emergency cut-off valve and the second emergency cut-off valve are emergency cut-off, and the hydraulic oil enters the return oil pipeline along the first diversion branch or the second diversion branch respectively, and then flows back to the oil storage tank. The return oil pipeline is provided with a return oil valve (181), a return oil flow meter (182) and a return oil filter (18) in sequence along the return oil direction.

2. The crane pipe lifting cylinder hydraulic system according to claim 1 is characterized in that: The first hydraulic component comprises a first electromagnetic reversing valve (7) and a first hydraulic cylinder (8), wherein the push rod of the first hydraulic cylinder is connected to a first vertical pipe on the crane pipe, and the second hydraulic component comprises a second electromagnetic reversing valve (10) and a second hydraulic cylinder (9), wherein the push rod of the second hydraulic cylinder is connected to a second vertical pipe on the crane pipe.

3. The crane pipe lifting cylinder hydraulic system according to claim 2 is characterized in that: The first electromagnetic reversing valve (7) includes an interface A, an interface B, an interface C, and an interface D. The first hydraulic cylinder (8) includes a port and a port. The a port is connected to the rodless chamber of the first hydraulic cylinder, and the b port is connected to the rod chamber of the first hydraulic cylinder. The first branch is connected to the interface C, and the interface C is connected to the b port. The third branch is connected to the interface D, and the interface D is connected to the a port, so as to drive the piston of the first hydraulic cylinder to retract and complete the lifting movement of the first vertical pipe.

4. The crane pipe lifting cylinder hydraulic system according to claim 3 is characterized in that: The first branch (103) is connected to the interface A, which is connected to the a port; the third branch (104) is connected to the interface B, which is connected to the b port, driving the piston of the first hydraulic cylinder to extend and completing the descending movement of the first drop pipe; the third branch is provided with a third oil return valve (141) and a third oil return check valve (142) in sequence along the oil outlet direction.

5. The crane pipe lifting cylinder hydraulic system according to claim 2 is characterized in that: The second electromagnetic reversing valve (10) includes an interface E, an interface F, an interface H, and an interface I. The second hydraulic cylinder includes an e port and an f port. The e port is connected to the rodless chamber of the second hydraulic cylinder (9), and the f port is connected to the rod chamber of the second hydraulic cylinder. The second branch (105) is connected to the interface H, and the interface H is connected to the port. The fourth branch (106) is connected to the interface I, and the interface I is connected to the e port, driving the piston of the second hydraulic cylinder to retract and complete the lifting movement of the second vertical pipe.

6. The crane pipe lifting cylinder hydraulic system according to claim 5, characterized in that: The second branch (105) is connected to the interface E, which is connected to the e port. The fourth branch (106) is connected to the interface F, which is connected to the f port, driving the piston of the second hydraulic cylinder (9) to extend and complete the descending movement of the second drop pipe. The fourth branch is provided with a fourth oil return valve (161) and a fourth oil return check valve (162) in sequence along the oil outlet direction.

7. The crane pipe lifting cylinder hydraulic system according to claim 1, characterized in that: The first stop valve (6) and the second stop valve (11) are opened simultaneously, and the first hydraulic component and the second hydraulic component are started simultaneously; The first stop valve is opened, the second stop valve is closed, and the first hydraulic assembly is started to drive the first drop pipe to move up and down; The second stop valve is opened, the first stop valve is closed, and the second hydraulic assembly is started to drive the second vertical pipe to perform lifting motion.

8. The crane pipe lifting cylinder hydraulic system according to claim 1, characterized in that: A first accumulator (16) is provided on the oil supply pipeline between the first flow guiding branch and the first branch, and a first oil guiding valve (191) and a first oil guiding check valve (192) are provided in sequence along the oil outlet direction of the first flow guiding branch; a second accumulator (17) is provided on the oil supply pipeline between the second flow guiding branch and the second branch, and a second oil guiding valve (171) and a second oil guiding check valve (172) are provided in sequence along the oil outlet direction of the second flow guiding branch.

9. The crane pipe lifting cylinder hydraulic system according to claim 1, characterized in that: A first one-way stop valve (15) is provided on the oil supply pipeline between the first oil pump (14) and the overflow valve (2), and a float liquid level gauge and a liquid level sensor are provided on the oil storage tank.

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