CN113879391B - Steering hydraulic system and crane - Google Patents
Steering hydraulic system and crane Download PDFInfo
- Publication number
- CN113879391B CN113879391B CN202111017008.5A CN202111017008A CN113879391B CN 113879391 B CN113879391 B CN 113879391B CN 202111017008 A CN202111017008 A CN 202111017008A CN 113879391 B CN113879391 B CN 113879391B
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- steering
- oil
- channel
- control valve
- valve body
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/062—Details, component parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/07—Supply of pressurised fluid for steering also supplying other consumers ; control thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/08—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of steering valve used
Abstract
The invention provides a steering hydraulic system and a crane, comprising: a diverter connected to the steering axle, the diverter configured to open or close a passage according to a steering signal; a control valve body connected to the steering gear, the control valve body being configured to open or close a valve according to pilot oil to open or close a corresponding oil passage; the steering oil cylinder is connected with the steering gear and the control valve body; the power mechanism is connected with the steering gear and the control valve body, and is used for providing power for the steering oil cylinder through the channel and the oil way; the control valve body and the steering gear are arranged in parallel, and the steering gear sends the pilot oil to the control valve body. The invention can solve the problem that the sensitivity cannot be considered when a larger flow is allowed to pass.
Description
Technical Field
The invention relates to the technical field of engineering machinery, in particular to a steering hydraulic system and a crane.
Background
At present in mobile crane technical field, the load-carrying capacity of hoist constantly promotes, and the counter weight of corresponding arrangement also is more and more heavy, for reducing user's use cost, requires mobile crane to possess stronger area counter weight ability of traveling. The crane often needs to work under complex site conditions, in order to meet various complex use conditions, the crane is required to have a flexible steering function, a steering system is an important mechanism for realizing the steering function of the automobile crane, and when the counterweight of the crane is increased, higher requirements are correspondingly put forward on the steering system of the crane. In the conventional steering system, the structure is high in sensitivity, the flow rate passing ability is easily limited, and the sensitivity is low due to the high flow rate passing ability, so that the sensitivity of the steering system cannot be considered when a large flow rate is allowed to pass.
Disclosure of Invention
In view of this, embodiments of the present invention are directed to provide a steering hydraulic system and a crane, which can solve the problem that sensitivity cannot be considered when a large flow is allowed to pass through.
According to an aspect of the present invention, an embodiment of the present invention provides a steering hydraulic system, which is connected to a steering axle in a construction machine, including: a diverter connected to the steering axle, the diverter configured to open or close a passage according to a steering signal; a control valve body connected to the steering gear, the control valve body being configured to open or close a valve by pilot oil to open or close a corresponding oil passage; the steering oil cylinder is connected with the steering gear and the control valve body, and is configured to adjust the movement direction of the engineering machinery according to the input and the output of the channel and the oil way; the power mechanism is connected with the steering gear and the control valve body, and is used for providing power for the steering oil cylinder through the channel and the oil way; the control valve body and the steering gear are arranged in parallel, and the steering gear conveys the pilot oil to the control valve body; the pilot oil means that when the oil pressure at the joint of the steering gear and the steering oil cylinder exceeds a preset oil pressure, the oil exceeding the preset oil pressure is conveyed to the control valve body as the pilot oil so that the control valve body opens or closes the valve.
In one embodiment, the diverter includes: the first channel is communicated with the steering oil cylinder and the control valve body, and the first channel is opened when the steering signal does not exist; the control valve body includes: a first valve connected to the steering gear and the steering cylinder, the first valve being configured to be opened by the pilot oil output through the first passage; when the steering signal is not available, the first channel, the oil way for opening the first valve and the power mechanism form a circulation loop.
In one embodiment, the diverter further comprises: the steering channel is communicated with the steering oil cylinder and the control valve body, and is opened according to the steering signal to convey or recover hydraulic oil; the control valve body further includes: and the steering valve is connected with the steering oil cylinder and the control valve body, and is constructed in a way that the pilot oil output through the steering channel is opened to open a corresponding oil way.
In one embodiment, the diversion channel comprises: the second channel and the third channel are respectively communicated with the steering oil cylinder and the control valve body, and are both opened to respectively convey and recover the hydraulic oil when the steering signal is a leftward steering signal.
In one embodiment, the control valve body further comprises: the second valve and the third valve are connected with the second channel, the third valve is connected with the third channel, the second valve and the third valve are both connected with the steering oil cylinder, and the second valve and the third valve are configured to open the second valve and the third valve through the pilot oil output by the second channel and the third channel so as to open oil passages corresponding to the second valve and the third valve.
In one embodiment, the diversion channel comprises: the fourth channel with the fifth channel respectively with steering cylinder with control valve body intercommunication, the fourth channel with the fifth channel structure is worked as when turn signal is right turn signal, all opens in order to carry respectively and retrieve hydraulic oil.
In one embodiment, the control valve body further comprises: the fourth valve and the fifth valve are connected with the fifth channel, the fourth valve and the fifth valve are both connected with the steering oil cylinder, and the fourth valve and the fifth valve are configured to be opened when the pilot oil is output through the fourth channel and the fifth channel, so that oil passages corresponding to the fourth valve and the fifth valve are opened.
In one embodiment, the power mechanism comprises: an oil tank connected with the steering gear and the control valve body, the oil tank configured to store hydraulic oil; an oil pump located between the oil tank and the steering gear, the oil pump configured to provide power for the oil tank to output the hydraulic oil.
In one embodiment, the steering cylinder includes: high pressure chamber and low pressure chamber, the high pressure chamber with the low pressure chamber respectively with the different passageway intercommunication of steering gear, the high pressure chamber with the low pressure chamber respectively with the different valve of control valve body is connected, the high pressure chamber constructs for the storage the steering gear with the hydraulic oil of control valve body input, the low pressure chamber construct to the steering gear with the control valve body output hydraulic oil.
According to another aspect of the present invention, an embodiment of the present invention provides a crane, including: a crane body; and the steering hydraulic system is arranged on the crane body and is configured to provide steering driving power for the crane body according to a steering signal.
According to the steering hydraulic system and the crane, the steering gear and the control valve body are connected in parallel to provide two feasible oil supply channels for the steering oil cylinder, when the oil pressure of the channel of the steering gear is too high, a valve of the control valve body can be opened to open more oil channels, the control valve body has a pilot reversing function and a one-way conduction function, the valve is selectively opened or closed according to pilot oil output by the steering gear to open or close the corresponding oil channel, so that the flow throughput of the hydraulic system is controlled, and the flow throughput capacity of the steering system can be improved. And the steering gear is directly connected with the steering axle, once a steering signal is received, the steering gear can directly open the channel so as to enable the steering oil cylinder to move, the response is fast, the steering sensitivity of the steering hydraulic system is improved, and the effect of improving the flow rate and simultaneously considering the sensitivity is achieved.
Drawings
Fig. 1 illustrates a steering hydraulic system provided in an exemplary embodiment of the present application.
Fig. 2 shows a steering hydraulic system according to another exemplary embodiment of the present application.
Description of reference numerals: 1. a steering axle; 2. a diverter; 3. a control valve body; 4. a steering cylinder; 5. a power mechanism; 6. a rod system structure; 41. a slide block.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Further, in the exemplary embodiments, since the same reference numerals denote the same components having the same structure or the same steps of the same method, if an embodiment is exemplarily described, only a structure or a method different from the already described embodiment is described in other exemplary embodiments.
Throughout the specification and claims, when one element is described as being "connected" to another element, the one element may be "directly connected" to the other element or "electrically connected" to the other element through a third element. Furthermore, unless explicitly described to the contrary, the term "comprising" and its corresponding terms should only be taken as including the stated features, but should not be taken as excluding any other features.
Fig. 1 shows a steering hydraulic system provided in an exemplary embodiment of the present application, and as shown in fig. 1, the steering hydraulic system is connected to a steering axle 1 in a working machine, and includes: a diverter 2, the diverter 2 being connected to the steer axle 1, the diverter 2 being configured to open or close a passage in accordance with a steering signal; a control valve body 3, the control valve body 3 being connected to the steering gear 2, the control valve body 3 being configured to open or close a valve by pilot oil to open or close a corresponding oil passage; the steering oil cylinder 4 is connected with the steering gear 2 and the control valve body 3, and the steering oil cylinder 4 is used for adjusting the motion direction of the engineering machinery according to the input and the output of the channel and the oil way; the power mechanism 5 is connected with the steering gear 2 and the control valve body 3, and the power mechanism 5 is used for providing power for the steering oil cylinder 4 through a channel and an oil way; the control valve body 3 and the steering gear 2 are arranged in parallel, and the steering gear 2 conveys pilot oil to the control valve body 3; the pilot oil means that when the oil pressure at the joint of the steering gear 2 and the steering cylinder 4 exceeds a preset oil pressure, the oil exceeding the preset oil pressure is delivered to the control valve body 3 as the pilot oil to cause the control valve body to open or close the valve.
The size of an oil port at the joint of the steering gear 2 and the steering oil cylinder 4 is fixed, so that the flow output from the steering gear 2 to the steering oil cylinder 4 is fixed, when the oil pressure at the oil port at which the steering gear 2 is connected with the steering oil cylinder 4 exceeds the preset oil pressure, the oil cannot be directly output from the steering gear 2 to the steering oil cylinder 4, and therefore, a valve in the control valve body 3 is opened by the oil pressure difference generated at the oil port of the steering gear 2, so that the hydraulic oil exceeding the preset oil pressure can flow through the control valve body 3 and enter the steering oil cylinder 4 from an oil path in the control valve body 3. The control valve body 3 is opened through pilot oil, a plurality of oil paths can be formed, the steering gear 2 is connected with the control valve body 3 in parallel, the steering gear 2 and the control valve body 3 simultaneously convey hydraulic oil to the steering oil cylinder 4, and the injection rate of the hydraulic oil can be improved. The pilot oil output from each channel of the steering gear 2 can correspondingly open different valves in the control valve body, for example, one channel outputs hydraulic oil according to a steering signal, and when the hydraulic oil exceeds the preset oil pressure of the channel, the pilot oil output from the channel opens the valve having the same function as the channel to form a second oil path having the same function, so that the pilot oil output from different channels can correspondingly open different valves.
The steering gear 2 in the steering hydraulic system can adopt a recirculating ball type steering gear 2, and the recirculating ball type steering gear 2 is connected with a steering axle 1 through a rod system structure 6. The bar system structure 6 is composed of a plurality of bars, the moving pairs in the bar system structure 6 are all low pairs in surface contact, so that the bearing pressure is small, the abrasion is light, the bearing capacity is high, the bar system structure 6 is simple in shape, the contact between the members is kept by the geometrical constraint of the members, the members work reliably, and the bar system structure 6 can realize the conversion among a plurality of moving forms. Therefore, the adoption of the rod system structure 6 as the connection between the steering gear 2 and the steering axle 1 can improve the flexibility and stability of the steering hydraulic system.
The power mechanism may include: an oil tank connected to the steering gear 2 and the control valve body 3, the oil tank being configured to store hydraulic oil; and an oil pump located between the oil tank and the steering gear 2, the oil pump being configured to power the oil tank to output hydraulic oil.
The power mechanism 5 may adopt a steering oil tank for storing hydraulic oil of the entire steering hydraulic system, adopt a steering oil pump as a power source, and the steering oil cylinder 4, the steering oil pump, the steering gear 2, the control valve body 3, and the steering oil cylinder 4 may form a circulation loop.
According to the steering hydraulic system provided by the invention, two feasible oil supply channels are provided for the steering oil cylinder 4 by connecting the steering gear 2 and the control valve body 3 in parallel, when the oil pressure of the channel of the steering gear 2 is overlarge, a valve of the control valve body 3 can be opened to open more than one oil channel, the control valve body 3 has a pilot reversing function and a one-way conduction function, and the valve is selectively opened or closed by pilot oil output by the steering gear 2 to open or close the corresponding oil channel, so that the flow throughput of the hydraulic system is controlled, and the flow throughput of the steering system can be improved. And the steering gear 2 is directly connected with the steering axle 1, once a steering signal is received, the steering gear 2 can directly open a channel so as to enable the steering oil cylinder 4 to move, the response is fast, and the steering sensitivity of the steering hydraulic system is improved.
The steering oil cylinder 4 can be provided with a plurality of sliding blocks 41, the sliding blocks 41 can separate the steering oil cylinder 4 into two sealed chambers, and the steering oil cylinder 4 can comprise: high-pressure chamber and low pressure chamber, high-pressure chamber and low pressure chamber communicate with the different passageway of steering gear 2 respectively, and high-pressure chamber and low pressure chamber are connected with the different valve of control valve body 3 respectively, and the high-pressure chamber constructs for the hydraulic oil of storage steering gear 2 and control valve body 3 input, and the low pressure chamber constructs for exporting hydraulic oil to steering gear 2 and control valve body 3. The slider 41 is directly connected with the mechanical part, when hydraulic oil is injected into the high-pressure cavity to push the slider 41 to move towards the low-pressure cavity, the slider 41 drives the mechanical part connected with the slider to move, so that the effect of changing the rotation direction of the engineering machinery is achieved, namely, the left and right displacement of the slider 41 can determine the left and right rotation direction of the engineering machinery, the left and right displacement of the sliding is achieved by changing the volume of the cavities on the left and right sides of the slider 41, and the volume of the cavities on the left and right sides of the slider 41 is determined by the amount of the injected hydraulic oil. And, high-pressure chamber and low-pressure chamber are by input and output decision, the chamber of input hydraulic oil is the high-pressure chamber, the chamber of output hydraulic oil is the low-pressure chamber, increase the pressure in high-pressure chamber and thus extrude the slide block 41 to move through inputting hydraulic oil, reduce the liquid volume in low-pressure chamber through outputting the hydraulic oil in low-pressure chamber and thus make the slide block 41 can be light to slip towards the low-pressure chamber, and then make the mechanical part that the slide block 41 connects turn to fast, reach higher steering sensitivity.
In an embodiment, the diverter 2 may comprise: the first channel is communicated with the steering oil cylinder 4 and the control valve body 3, and the first channel is opened when no steering signal exists; the control valve body 3 includes: the first valve is connected with the steering gear 2 and the steering oil cylinder 4, and is constructed to be opened through pilot oil output by the first channel; when there is no steering signal, the first passage, the oil path where the first valve is opened, and the power mechanism 5 form a circulation loop.
FIG. 2 shows a steering hydraulic system provided by another exemplary embodiment of the present application, and as shown in FIG. 2, the first passage may be a P-T passage, and the first valve may be opened P 1 -T 1 An oil passage. When no steering signal is input, that is, the steering cylinder 4 needs to maintain the current state, the oil amount in the steering cylinder 4 does not need to be changed, so that other channels or oil channels leading to the steering cylinder 4 need to be closed, and only the P-T channel and the P channel are opened 1 -T 1 And an oil passage forming a circulation circuit which is not communicated with the steering cylinder 4. The circuit is based on the drive unit 5 and delivers hydraulic oil to the steering gear 2, from the P-T channel to the control valve body 3 and from P 1 -T 1 The oil path returns to the power mechanism 5, and the hydraulic oil only flows in the steering gear 2 and the control valve body 3, so that the steering oil cylinder 4 is not influenced, and the steering is not generated.
In an embodiment, the steering gear 2 may further include: the steering channel is communicated with the steering oil cylinder 4 and the control valve body 3, and is opened according to a steering signal to convey or recover hydraulic oil; the control valve body 3 may further include: and the steering valve is connected with the steering oil cylinder 4 and the control valve body 3, and is constructed to be opened through pilot oil output by the steering channel so as to open a corresponding oil way.
The steering gear 2 may further include a steering passage, when the steering passage is opened, hydraulic oil output by the power mechanism 5 may flow to the steering cylinder 4 through the steering passage, so as to push the slider 41 in the steering cylinder 4, and the hydraulic oil on one side of the sliding direction of the slider 41 is squeezed to generate pressure, and may also be discharged from the steering passage, so as to recycle the hydraulic oil to the power mechanism 5, thereby forming a circulation loop in the power mechanism 5, the steering passage and the steering cylinder 4, so as to push the slider 41 in the steering cylinder 4, thereby changing the moving direction.
The control valve body 3 can also comprise a steering valve, and the steering gear 2 and the control valve body 3 are in a parallel state, so that when all valves in the control valve body 3 are closed, the power mechanism 5, the steering channel and the steering oil cylinder 4 can still form a circulation loop. The size of an oil port at the connection part of the steering gear 2 and the steering oil cylinder 4 is determined, so that the flow rate input into the steering oil cylinder 4 by the steering gear 2 is also determined, when the flow rate is input into the steering oil cylinder 4 from the steering gear 2 and the flow rate requirement is overlarge, namely the flow rate exceeds the maximum flow rate which can be input into the steering oil cylinder 4 by the steering gear 2, the excessive flow rate cannot be input into the steering oil cylinder 4 by the steering gear 2. At this time, an oil pressure difference is formed at the oil port of the steering gear 2, the valve of the control valve body 3 is opened through the oil pressure difference, and the excessive flow flows to the steering cylinder 4 from the oil path opened in the control valve body 3, so that the pressure of the oil port of the steering gear 2 is reduced.
The diverting passage may include: and the second channel and the third channel are respectively communicated with the steering oil cylinder 4 and the control valve body 3, and are both opened to respectively convey and recover hydraulic oil when the steering signal is a leftward steering signal.
If the hydraulic oil of the power mechanism 5 flows through the second channel to reach the steering oil cylinder 4, the hydraulic oil of the low-pressure cavity in the steering oil cylinder 4 flows through the third channel and returns to the power mechanism 5, if the hydraulic oil of the power mechanism 5 flows through the third channel to reach the steering oil cylinder 4, the hydraulic oil of the low-pressure cavity in the steering oil cylinder 4 flows through the second channel and returns to the power mechanism 5, a circulation loop is formed among the power mechanism 5, the second channel, the steering oil cylinder 4 and the third channel, the loop conveys the hydraulic oil to the steering oil cylinder 4 through the steering gear 2, and the throughput of the hydraulic oil is limited by the size of an oil port of the steering gear 2.
The control valve body 3 may further include: the second valve and the third valve are both connected with the steering oil cylinder 4, and the second valve and the third valve are structured to open the second valve and the third valve through pilot oil output by the second channel and the third channel so as to open oil passages corresponding to the second valve and the third valve.
When the differential pressure received by the steering gear 2 is too large, the hydraulic oil exceeding the oil port of the steering gear 2 is conveyed to the control valve body 3, the hydraulic oil which is excessive at the second passage flows to the second valve, so that the second valve is opened, the hydraulic oil flows to the steering oil cylinder 4 from the second oil path corresponding to the second valve, and the joint of the second oil path and the steering oil cylinder 4 is provided with another oil port, so that the flow throughput is improved, and the speed of the input oil quantity of the high-pressure cavity of the steering oil cylinder 4 is increased. The return oil of the low-pressure cavity in the steering oil cylinder 4 passes through the third channel, when the oil pressure received by the third channel is too high, the excessive hydraulic oil flows through the oil way corresponding to the third valve in the control valve body 3, and then returns to the power mechanism 5 through the control valve body 3, so that the oil return rate is increased, and the working rate of the steering oil cylinder 4 can be increased.
As shown in FIG. 2, the second passage may be a P-B passage, the third passage may be an A-T passage, and the oil passage corresponding to the opening of the second valve is P 1 -B 1 The oil circuit corresponding to the opening of the third valve is A 1 -P 1 An oil passage. When the steering gear 2 receives a left steering signal, namely the steering axle 1 is subjected to pressure applied by steering action, the left steering signal is transmitted to the steering gear 2 through the rod system structure 6, an acting force is applied to the steering gear 2, a steering valve in the steering gear 2 generates certain dislocation, so that a P-T channel is closed, a P-B channel is opened, and hydraulic oil is input into the steering oil cylinder 4 after passing through the P-B channel. When steering gearWhen the pressure difference at the position 2 is overlarge, the hydraulic oil enters the control valve body 3 through the port b and is used as a pilot oil indicator P 1 -B 1 The valve corresponding to the oil path is opened, so that the hydraulic oil can pass through the valve P 1 -B 1 The oil path enters the steering oil cylinder 4 to do work, and the hydraulic oil in the low-pressure cavity in the steering oil cylinder 4 passes through A 1 -P 1 The oil path and the a-T channel flow back to the power mechanism 5.
The diverting passage may include: and the fourth channel and the fifth channel are respectively communicated with the steering oil cylinder 4 and the control valve body 3, and are both opened to respectively convey and recover hydraulic oil when the steering signal is a right steering signal.
If the hydraulic oil of the power mechanism 5 flows through the fourth channel to reach the steering cylinder 4, the hydraulic oil in the low-pressure cavity of the steering cylinder 4 flows through the fifth channel to return to the power mechanism 5, if the hydraulic oil of the power mechanism 5 flows through the fifth channel to reach the steering cylinder 4, the hydraulic oil in the low-pressure cavity of the steering cylinder 4 flows through the fourth channel to return to the power mechanism 5, a circulation loop is formed among the power mechanism 5, the fourth channel, the steering cylinder 4 and the fifth channel, the loop conveys the hydraulic oil for the steering cylinder 4 through the steering gear 2, and the passing amount of the hydraulic oil is limited by the size of an oil port of the steering gear 2.
The fourth channel and the fifth channel correspond to the second channel and the third channel in opposite directions, and when the second channel and the third channel are responsible for receiving the signals turning to the left and providing channels for turning to the left, the fourth channel and the fifth channel are responsible for receiving the signals turning to the right and providing channels for turning to the right.
The control valve body 3 may further include: and the fourth valve and the fifth valve are opened through pilot oil output according to the fourth channel and the fifth channel so as to open oil paths corresponding to the fourth valve and the fifth valve.
When the differential pressure received by the steering gear 2 is too large, the hydraulic oil exceeding the oil port of the steering gear 2 is conveyed to the control valve body 3, the hydraulic oil which is excessive at the fourth channel flows to the fourth valve, so that the fourth valve is opened, the hydraulic oil flows to the steering oil cylinder 4 from the fourth oil path corresponding to the fourth valve, and the joint of the fourth oil path and the steering oil cylinder 4 is provided with another oil port, so that the flow throughput is improved, and the speed of the input oil quantity of the high-pressure cavity of the steering oil cylinder 4 is increased. The return oil of the low-pressure cavity in the steering oil cylinder 4 passes through the fifth channel, when the oil pressure received by the fifth channel is too large, the excessive hydraulic oil flows through the oil way corresponding to the fifth valve in the control valve body 3, and then returns to the power mechanism 5 through the control valve body 3, so that the oil return rate is increased, and the working rate of the steering oil cylinder 4 can be increased.
As shown in FIG. 2, the fourth channel may be a P-A channel, the fifth channel may be a B-T channel, and the oil path corresponding to the opening of the fourth valve is P 1 -A 1 The oil path corresponding to the opening of the fifth valve is B 1 -T 1 An oil passage. When the steering gear 2 receives a signal of steering right, namely the steering axle 1 is subjected to pressure applied by steering action, the signal is transmitted to the steering gear 2 through the rod system structure 6, an acting force is applied to the steering gear 2, a steering valve in the steering gear 2 generates certain dislocation, so that a P-T channel is closed, a P-A channel is opened, and hydraulic oil is input into the steering oil cylinder 4 after passing through the P-B channel. When the pressure difference at the steering gear 2 is overlarge, the hydraulic oil enters the control valve body 3 through the port a and is used as a pilot oil indicator P 1 -A 1 The valve corresponding to the oil path is opened, so that the hydraulic oil can pass through the valve P 1 -A 1 The oil path enters the steering oil cylinder 4 to do work, and the hydraulic oil in the low-pressure cavity in the steering oil cylinder 4 passes through the oil path B 1 -T 1 The oil path and the B-T channel flow back to the power mechanism 5.
The present application further provides a crane, comprising: a crane body; and the steering hydraulic system is arranged on the crane body and is configured to provide steering driving power for the crane body according to the steering signal.
According to the crane, a steering hydraulic system is connected with a steering gear 2 and a control valve body 3 in parallel to provide two feasible oil supply channels for a steering oil cylinder 4, when the oil pressure of the channels of the steering gear 2 is too large, a valve of the control valve body 3 can be opened to open a plurality of oil channels, the control valve body 3 has a pilot reversing function and a one-way conducting function, the valve is selectively opened or closed according to pilot oil output by the steering gear 2 to open or close the corresponding oil channels, so that the flow throughput of the hydraulic system is controlled, and the flow throughput capacity of the steering system can be improved. And the steering gear 2 is directly connected with the steering axle 1, once a steering signal is received, the steering gear 2 can directly open a channel so as to enable the steering oil cylinder 4 to move, the response is fast, the steering sensitivity of the steering hydraulic system is improved, and the steering sensitivity is considered while the flow throughput is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.
Claims (10)
1. A steering hydraulic system connected with a steering axle in a construction machine, comprising:
a diverter connected to the steering axle, the diverter configured to open or close a passage according to a steering signal;
a control valve body connected to the steering gear, the control valve body being configured to open or close a valve by pilot oil to open or close a corresponding oil passage;
the steering oil cylinder is connected with the steering gear and the control valve body, and is configured to adjust the movement direction of the engineering machinery according to the input and the output of the channel and the oil way; and
the power mechanism is connected with the steering gear and the control valve body and is used for providing power for the steering oil cylinder through the channel and the oil way;
the control valve body and the steering gear are arranged in parallel, and the steering gear conveys the pilot oil to the control valve body; the pilot oil indicates that when the oil pressure at the joint of the steering gear and the steering oil cylinder exceeds a preset oil pressure, the oil exceeding the preset oil pressure is taken as the pilot oil to be conveyed to the control valve body, so that the control valve body opens or closes the valve to form a second oil way with the same function; when the control valve body is opened, the steering gear and the control valve body simultaneously convey hydraulic oil to the steering oil cylinder.
2. The steering hydraulic system of claim 1,
the steering gear includes: the first channel is communicated with the steering oil cylinder and the control valve body, and the first channel is opened when the steering signal does not exist;
the control valve body includes: a first valve connected to the steering gear and the steering cylinder, the first valve being configured to be opened by the pilot oil output through the first passage;
when the steering signal is not available, the first channel, the oil way for opening the first valve and the power mechanism form a circulation loop.
3. The steering hydraulic system of claim 1,
the steering gear further includes: the steering channel is communicated with the steering oil cylinder and the control valve body, and is opened according to the steering signal to convey or recover hydraulic oil;
the control valve body further includes: and the steering valve is connected with the steering oil cylinder and the control valve body, and is constructed in a way that the pilot oil output through the steering channel is opened to open a corresponding oil way.
4. The steering hydraulic system of claim 3, wherein the steering passage comprises: the second channel and the third channel are respectively communicated with the steering oil cylinder and the control valve body, and are both opened to respectively convey and recover the hydraulic oil when the steering signal is a leftward steering signal.
5. The steering hydraulic system of claim 4, wherein the control valve body further comprises: the second valve and the third valve are connected with the second channel, the third valve is connected with the third channel, the second valve and the third valve are both connected with the steering oil cylinder, and the second valve and the third valve are configured to open the second valve and the third valve through the pilot oil output by the second channel and the third channel so as to open oil passages corresponding to the second valve and the third valve.
6. The steering hydraulic system of claim 3, wherein the steering passage comprises: the fourth channel with the fifth channel respectively with steering cylinder with control valve body intercommunication, the fourth channel with the fifth channel structure is worked as when turn signal is right turn signal, all opens in order to carry respectively and retrieve hydraulic oil.
7. The steering hydraulic system of claim 6, wherein the control valve body further comprises: the fourth valve and the fifth valve are connected with the fourth channel, the fifth valve is connected with the fifth channel, the fourth valve and the fifth valve are both connected with the steering oil cylinder, and the fourth valve and the fifth valve are configured to open the fourth valve and the fifth valve through the pilot oil output by the fourth channel and the fifth channel so as to open oil passages corresponding to the fourth valve and the fifth valve.
8. The steering hydraulic system as claimed in claim 1, wherein the power mechanism comprises:
an oil tank connected with the steering gear and the control valve body, the oil tank configured to store hydraulic oil;
the oil pump is positioned between the oil tank and the steering gear and between the oil tank and the control valve body, and the oil pump is constructed to provide power for the oil tank to output the hydraulic oil.
9. The steering hydraulic system according to claim 1, characterized in that the steering cylinder comprises: high-pressure chamber and low pressure chamber, the high-pressure chamber with the low pressure chamber respectively with the different passageway intercommunication of steering gear, the high-pressure chamber with the low pressure chamber respectively with the different valve of control valve body is connected, the high-pressure chamber constructs for the storage the steering gear with the hydraulic oil of control valve body input, the low pressure chamber constructs to the steering gear with the control valve body output hydraulic oil.
10. A crane, comprising:
a crane body; and
the steering hydraulic system as claimed in any one of claims 1 to 9, which is mounted on the crane body, the steering hydraulic system being configured to provide steering drive power to the crane body in response to a steering signal.
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| CN202111017008.5A CN113879391B (en) | 2021-08-31 | 2021-08-31 | Steering hydraulic system and crane |
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| CN202111017008.5A CN113879391B (en) | 2021-08-31 | 2021-08-31 | Steering hydraulic system and crane |
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| CN113879391A CN113879391A (en) | 2022-01-04 |
| CN113879391B true CN113879391B (en) | 2022-11-08 |
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| CN114590314A (en) * | 2022-03-22 | 2022-06-07 | 三一汽车起重机械有限公司 | Emergency steering system, chassis and operation machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE10257130B4 (en) * | 2002-12-05 | 2006-07-27 | Sauer-Danfoss Aps | Fully hydraulic steering |
| DE102005035171A1 (en) * | 2005-07-27 | 2007-02-01 | Bosch Rexroth Aktiengesellschaft | Electrohydraulic steering |
| DE102010014317A1 (en) * | 2010-04-09 | 2011-10-13 | Linde Material Handling Gmbh | Mobile work machine, in particular industrial truck |
| CN103707921B (en) * | 2013-12-20 | 2016-01-20 | 华南理工大学 | A kind of vehicle dual-speed hydraulic turns to amplification system |
| CN104295551B (en) * | 2014-08-18 | 2016-03-23 | 中国农业大学 | A kind of auto-steering proportional control valve block and the navigation hydraulic system based on this valve block |
| CN106609779A (en) * | 2017-02-08 | 2017-05-03 | 雷沃重工股份有限公司 | Flow amplifying valve and loading machine variable steering hydraulic system |
| DE102018125053B4 (en) * | 2018-10-10 | 2022-02-17 | Danfoss Power Solutions Aps | Hydraulic steering assembly |
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