CN218407971U

CN218407971U - Hydraulic system and vehicle

Info

Publication number: CN218407971U
Application number: CN202222929649.4U
Authority: CN
Inventors: 宋克俊; 李鹏飞; 苗恒新
Original assignee: Sany Heavy Equipment Co Ltd
Current assignee: Sany Heavy Equipment Co Ltd
Priority date: 2022-11-03
Filing date: 2022-11-03
Publication date: 2023-01-31
Anticipated expiration: 2032-11-03

Abstract

The utility model relates to an engineering vehicle technical field provides a hydraulic system and vehicle, wherein, hydraulic system includes: the hydraulic oil cylinder comprises a rod cavity and a rodless cavity; the first valve body comprises a first opening, a second opening and a third opening, the first opening is connected with the rod cavity, the second opening is communicated with the rodless cavity, the third opening is used for hydraulic oil to flow out, the second opening is communicated with the third opening, and the flow between the second opening and the third opening is reduced along with the reduction of the pressure on the first opening. This application has solved among the correlation technique through the setting of first valve body, and when the pressure of no pole intracavity is less, hydraulic system can't support the problem that the load received external force effect when the load steadily, has realized the balanced effect to the reverse load of piston rod.

Description

Hydraulic system and vehicle

Technical Field

The utility model relates to an engineering vehicle technical field particularly, relates to a hydraulic system and a vehicle.

Background

In the related art, in the lifting process of the hydraulic system, when the load connected with the piston rod moves, and when the pressure in the rodless cavity is low, if the load is acted by external force, the piston rod can be driven to move rapidly, namely, the hydraulic system cannot stably support the load when the load is acted by the external force, so that accidents are caused.

SUMMERY OF THE UTILITY MODEL

The present invention aims at least solving one of the technical problems existing in the prior art or the related art.

To this end, a first aspect of the present invention provides a hydraulic system.

A second aspect of the present invention provides a vehicle.

In view of this, the first aspect of the present invention provides a hydraulic system, including: the hydraulic oil cylinder comprises a rod cavity and a rodless cavity; the first valve body comprises a first opening, a second opening and a third opening, the first opening is connected with the rod cavity, the second opening is communicated with the rodless cavity, and the third opening is used for flowing out hydraulic oil; the second opening is communicated with the third opening, and the flow between the second opening and the third opening is reduced along with the reduction of the pressure applied to the first opening.

The utility model provides a hydraulic system, including hydraulic cylinder, hydraulic cylinder is including pole chamber and no pole chamber, and it can be understood that hydraulic cylinder includes cylinder body, piston and piston rod, and the piston sets up in the cylinder body, and the one end of piston rod is connected with the piston, and the other end stretches out the cylinder body. In the cylinder body, one side that has the piston rod is for having the pole chamber, does not have a side position rodless chamber of piston rod, and at the in-process of hydraulic system operation, hydraulic oil gets into rodless chamber under power device's drive, and then hydraulic oil promotes the piston and removes, drives the piston rod and stretches out the cylinder body, and simultaneously, the hydraulic oil outflow that has the pole intracavity has the pole chamber, guarantees the smooth removal of piston. On the contrary, hydraulic oil enters the rod cavity under the driving of the power device, the hydraulic oil pushes the piston to move, the piston rod is driven to contract into the cylinder, and meanwhile, the hydraulic oil in the rodless cavity flows out, so that the smooth movement of the piston is guaranteed.

Further, the hydraulic system also includes a first valve body including a first opening, a second opening, and a third opening. The second opening is communicated with the rodless cavity, the third opening is used for flowing out hydraulic oil, and the second opening is communicated with the third opening. When the piston rod stretches out, hydraulic oil in the rod cavity can flow out through the second opening and the third opening, and smooth movement of the piston in the cylinder body is guaranteed. Further, the first opening of the first valve body is communicated with the rodless cavity, so that the pressure of hydraulic oil in the rod cavity can be sensed through the first opening, and the opening degree of the second opening of the first valve body between the third openings can be reduced along with the reduction of the pressure sensed by the first opening. That is, when the pressure of the hydraulic oil in the rodless chamber is higher, the opening between the second opening and the third opening is larger, so as to ensure that the hydraulic oil in the rod chamber can smoothly flow out from the second opening and the third opening, and when the pressure of the hydraulic oil in the rodless chamber is lower, the opening between the second opening and the third opening is smaller, so that the flow rate of the hydraulic oil is lower.

That is to say, when the pressure of the hydraulic oil in the rodless cavity is small, it indicates that the power device pushes the hydraulic oil with small power to enter the rodless cavity, that is, it indicates that the piston rod does not need to extend out of the cylinder body quickly at this time, the pressure sensed by the first opening is small, and correspondingly, the opening between the second opening and the third opening is small, so that the hydraulic oil in the rod cavity cannot flow out through the second opening and the third opening quickly, and the piston cannot move quickly, that is, the piston rod cannot extend out of the cylinder body quickly, and a balance effect on a reverse load of the piston rod is achieved. Therefore, under the condition that the piston rod does not need to move quickly, even if the piston rod is under the tension of a load, the piston rod cannot extend out of the cylinder body quickly, the moving speed of the piston rod is guaranteed, and the safety of a hydraulic system in the operation process is further guaranteed.

The utility model provides a hydraulic system, through the setting of first valve body for the first opening of first valve body is connected with hydraulic cylinder's no pole chamber, and the second opening is linked together with hydraulic cylinder's the pole chamber that has, and the second opening is linked together with the third opening, and the hydraulic oil that has the pole intracavity can flow through second opening and third opening, and simultaneously, aperture between second opening and the third opening reduces along with the reduction of the pressure that first opening received. When the pressure in the rodless cavity is small, the opening degree between the second opening and the third opening is small, so that hydraulic oil cannot flow out of the rod cavity rapidly, namely the piston rod cannot extend out of the cylinder body rapidly, and the balance effect of the reverse load of the piston rod is achieved. The load connected with the piston rod is prevented from moving rapidly, and the safety of the hydraulic system in the operation process is further ensured.

In addition, according to the utility model provides a hydraulic system among the above-mentioned technical scheme can also have following additional technical characterstic:

in the above technical solution, further, the hydraulic system further includes: the oil tank is used for storing hydraulic oil, and is communicated with the third opening and the rodless cavity; the first check valve is connected with the first valve body in parallel, an inlet of the first check valve is communicated with the oil tank, and an outlet of the first check valve is communicated with the rod cavity.

In the technical scheme, the hydraulic system further comprises an oil tank, the oil tank is used for storing hydraulic oil, the hydraulic oil in the rod cavity and the rodless cavity of the hydraulic system can be from the oil tank, and meanwhile, the hydraulic oil in the rod cavity and the rodless cavity can directly flow into the oil tank when flowing out. Specifically, the third opening of the first valve body is communicated with the oil tank, that is, in the process of extending the piston rod, hydraulic oil in the rod cavity can flow out into the oil tank.

Furthermore, the hydraulic system also comprises a first one-way valve, the first one-way valve is connected with the first valve body in parallel, an inlet of the first one-way valve is communicated with the oil tank, and an outlet of the first one-way valve is communicated with the rod cavity. That is, the hydraulic oil can flow into the rod chamber from the oil tank, and the hydraulic oil in the rod chamber cannot flow through the first check valve and can only flow out of the first valve body. Therefore, in the process of extending the hydraulic rod, hydraulic oil can be ensured to flow out of the first valve body, the piston rod is also ensured to be incapable of extending rapidly, and the safety performance of the hydraulic system is ensured. And when the piston rod stretched into the cylinder body, hydraulic oil could flow into the rod cavity through the first check valve, thereby avoiding the influence of the first valve body on the inflow of hydraulic oil and ensuring that the piston rod can smoothly stretch into the rod body.

In any of the above technical solutions, further, the hydraulic system further includes: a first damper disposed between the rodless cavity and the first opening.

In this technical scheme, between the first opening of no pole chamber and first valve body, can also be provided with first attenuator, through the setting of first attenuator, can play certain cushioning effect to the flow of hydraulic oil, avoid hydraulic oil to cause great impact to first opening, and then avoided first valve body to break down under the great impact force of hydraulic oil, guaranteed the steady operation of first valve body. Namely, the stable operation of the hydraulic system is ensured.

In any one of the above technical solutions, further, the number of the first valve bodies is plural, and the plural first valve bodies are connected in parallel.

In this technical scheme, the quantity of first valve body can set up to a plurality ofly to parallelly connected between a plurality of first valve body. Through the setting of a plurality of first valve body parallel connection, can guarantee the flow of the hydraulic oil between the first valve body both ends, also guarantee the flow of the hydraulic oil between pole chamber and the oil tank promptly, and then guarantee the flexible effect of piston rod.

Furthermore, the hydraulic system can further comprise a plurality of hydraulic oil cylinders, and the plurality of hydraulic oil cylinders are connected in parallel, so that the plurality of hydraulic oil cylinders can be connected through the plurality of first valve bodies connected in parallel, and the safety performance of each hydraulic oil cylinder is guaranteed.

In any of the above technical solutions, further, the hydraulic system further includes: one end of the pressure relief pipeline is communicated with the rodless cavity, and the other end of the pressure relief pipeline is communicated with the oil tank; and the second valve body is arranged on the pressure relief pipeline and used for controlling the on-off of the pressure relief pipeline.

In the technical scheme, the hydraulic system further comprises a pressure relief pipeline, one end of the pressure relief pipeline is communicated with the rodless cavity, and the other end of the pressure relief pipeline is communicated with the oil tank. In the process of hydraulic system operation, the piston rod probably receives the impact of the load of being connected, lead to the piston rod to have the trend to the inside shrink of cylinder body, at this moment, the hydraulic oil in no pole intracavity receives the pressure of piston, through the setting of pressure release pipeline, can be when the hydraulic oil in no pole intracavity receives pressure, that is when the piston rod receives the impact force of load, let out the hydraulic oil in no pole intracavity, in order to realize the buffering to the impact force, avoid the impact force to cause hydraulic cylinder's damage, the coupling part between piston rod and the load has also been avoided simultaneously receives the damage under the effect of impact force.

Furthermore, still be provided with the second valve body on pressure release pipeline, the break-make of second valve body for control pressure release pipeline, that is to say, at hydraulic system lift and the in-process that descends to the load, hydraulic oil need pass in and out under power device's effect has the pole chamber and does not have the pole chamber, at this moment, closes the second valve body, avoids hydraulic oil to flow in pressure release pipeline, guarantees hydraulic system's the stability of lifting and descending process. When the second valve body is opened, the rodless cavity can be communicated with the oil tank through the pressure relief pipeline, so that hydraulic oil in the rodless cavity is discharged when the piston rod is impacted by load, and the effect of buffering is achieved.

In any of the above technical solutions, further, the hydraulic system further includes: one end of the oil return pipeline is communicated with the outlet of the second valve body, and the other end of the oil return pipeline is communicated with the rod cavity; and the second one-way valve is arranged on the oil return pipeline, an inlet of the second one-way valve is communicated with an outlet of the second valve body, and an outlet of the second one-way valve is communicated with the rod cavity.

In the technical scheme, between the outlet of the second valve body and the rod cavity, an oil return pipeline can be further arranged, through the arrangement of the oil return pipeline, hydraulic oil can flow back to the rod cavity through the oil return pipeline, namely when the piston rod is impacted by a load, the hydraulic oil in the rodless cavity flows out through the pressure release pipeline, meanwhile, the hydraulic oil is supplemented to the rodless cavity through the oil return pipeline, so that the piston rod can be moved in the process of being impacted, and the buffering effect of the piston rod on the impact is also ensured.

Furthermore, a second one-way valve is arranged on the oil return pipeline, an inlet of the second one-way valve is communicated with an outlet of the second valve body, and an outlet of the second one-way valve is communicated with the rod cavity. Through the setting of second check valve for hydraulic oil in the oil return pipeline can only get into there is the pole chamber, and the unable oil return pipeline that gets into of hydraulic oil that has the pole intracavity. Like this, at the in-process that hydraulic system lifted for hydraulic oil can be followed first valve body and flowed, and can't flow from returning oil pipe way, thereby has avoided returning oil pipe way to hydraulic system's the lifting to cross to cause the interference, has guaranteed hydraulic system's steady operation.

Specifically, when the pressure of the hydraulic oil in the oil return pipeline exceeds the conduction pressure of the second one-way valve, the hydraulic oil can flow to the rod cavity through the oil return pipeline, so that oil can be supplemented in the rod cavity, and when the pressure of the hydraulic oil in the oil return pipeline does not reach the conduction pressure of the second one-way valve, the hydraulic oil in the pressure release pipeline directly flows into the oil tank.

In any of the above technical solutions, further, the hydraulic system further includes: and the second damper is arranged between the second valve body and the oil tank.

Through the setting of second attenuator, can guarantee the pressure release pipeline and return the interior hydraulic oil flow's of oil pipe line stationarity, avoid causing great impact to second valve body and second check valve, guarantee hydraulic system's steady operation.

In any of the above technical solutions, further, the hydraulic system further includes: the first pressure detection piece is communicated with the rodless cavity and is used for detecting the pressure of the rodless cavity; and the second pressure detection piece is communicated with the rod cavity and is used for detecting the pressure of the rod cavity.

In this technical scheme, through the setting of first pressure measurement spare, can realize detecting the pressure of the hydraulic oil of no pole intracavity to guarantee that operating personnel can be timely acquire the pressure of no pole intracavity, avoid no pole intracavity pressure too big hydraulic system trouble that causes. Specifically, the first pressure detection chamber may be provided on a pipe communicating with the rodless chamber.

Correspondingly, through the setting of second pressure detection spare, can realize having the pressure of the hydraulic oil in the pole intracavity to detect to guarantee that operating personnel can be timely acquireing the pressure that has the pole intracavity, avoid having the pole intracavity pressure too big to cause hydraulic system trouble. Specifically, the second pressure detection chamber may be provided on a pipe communicating with the rod chamber.

In any of the above technical solutions, further, the first valve body includes a balance valve.

According to a second aspect of the present invention, a vehicle is proposed, comprising a hydraulic system as defined in any one of the above-mentioned technical solutions.

The utility model provides a vehicle, because of included any one of above-mentioned technical scheme's hydraulic system, consequently, this vehicle has included above-mentioned hydraulic system's whole beneficial effect, no longer gives unnecessary details here.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 shows a schematic structural diagram of a hydraulic system according to an embodiment of the present invention;

fig. 2 shows a partial enlarged view at a in fig. 1.

Wherein, the correspondence between the reference numbers and the component names in fig. 1 and fig. 2 is:

100 hydraulic system, 102 hydraulic cylinder, 104 rod chamber, 106 rodless chamber, 108 first valve body, 110 first opening, 112 second opening, 114 third opening, 116 oil tank, 118 first check valve, 120 first damper, 122 pressure relief line, 124 second valve body, 126 return line, 128 second check valve, 130 second damper, 132 first pressure detector, 134 second pressure detector.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

A hydraulic system and a vehicle according to some embodiments of the present invention will be described below with reference to fig. 1 and 2.

According to a first aspect of the present invention, as shown in fig. 1 and 2, a hydraulic system 100 is provided, comprising a hydraulic cylinder 102, wherein the hydraulic cylinder 102 comprises a rod cavity 104 and a rodless cavity 106; the hydraulic system 100 further comprises a first valve body 108, wherein the first valve body 108 comprises a first opening 110, a second opening 112 and a third opening 114, the first opening 110 is connected with the rod chamber 104, the second opening 112 is communicated with the rodless chamber 106, and the third opening 114 is used for flowing out hydraulic oil; further, the second opening 112 is communicated with the third opening 114, and the flow rate between the second opening 112 and the third opening 114 decreases as the pressure received by the first opening 110 decreases.

The utility model provides a hydraulic system 100, including hydraulic cylinder 102, hydraulic cylinder 102 is including pole chamber 104 and no pole chamber 106, and it can be understood that hydraulic cylinder 102 includes cylinder body, piston and piston rod, and the piston sets up in the cylinder body, and the one end of piston rod is connected with the piston, and the other end stretches out the cylinder body. In the cylinder body, one side with the piston rod is a rod cavity 104, and the other side without the piston rod is a rodless cavity 106, so that in the operation process of the hydraulic system 100, hydraulic oil enters the rodless cavity 106 under the driving of the power device, the hydraulic oil pushes the piston to move and drives the piston rod to extend out of the cylinder body, and meanwhile, the hydraulic oil in the rod cavity 104 flows out of the rod cavity 104, and the smooth movement of the piston is ensured. On the contrary, the hydraulic oil enters the rod chamber 104 under the driving of the power device, the hydraulic oil pushes the piston to move, the piston rod is driven to contract into the cylinder, and meanwhile, the hydraulic oil in the rodless chamber 106 flows out, so that the piston is ensured to move smoothly.

Further, the hydraulic system 100 also includes a first valve body 108, the first valve body 108 including a first port 110, a second port 112, and a third port 114. The second opening 112 is communicated with the rodless chamber 106, the third opening 114 is used for flowing out hydraulic oil, and the second opening 112 is communicated with the third opening 114. When the piston rod extends out, hydraulic oil in the rod cavity 104 can flow out through the second opening 112 and the third opening 114, so that smooth movement of the piston in the cylinder body is ensured. Further, the first opening 110 of the first valve body 108 communicates with the rodless chamber 106 so that the pressure of the hydraulic oil in the rod chamber 104 can be sensed through the first opening 110, and the opening degree of the second opening 112 of the first valve body 108 between the third openings 114 can be decreased as the pressure sensed by the first opening 110 decreases. That is, when the pressure of the hydraulic oil in the rod-less chamber 106 is high, the opening between the second opening 112 and the third opening 114 is large, so as to ensure that the hydraulic oil in the rod-less chamber 104 can smoothly flow out from the second opening 112 and the third opening 114, and when the pressure of the hydraulic oil in the rod-less chamber 106 is low, the opening between the second opening 112 and the third opening 114 is small, and the flow rate of the hydraulic oil is low.

That is, when the pressure of the hydraulic oil in the rod-less chamber 106 is small, it indicates that the power device pushes the hydraulic oil into the rod-less chamber 106 with small power, that is, it indicates that the piston rod does not need to extend out of the cylinder body quickly, at this time, the pressure sensed by the first opening 110 is small, and accordingly, the opening between the second opening 112 and the third opening 114 is small, so that the hydraulic oil in the rod chamber 104 cannot flow out through the second opening 112 and the third opening 114 quickly, and the piston cannot move quickly, that is, the piston rod cannot extend out of the cylinder body quickly, thereby achieving the balance effect of the reverse load on the piston rod. Therefore, under the condition that the piston rod does not need to move rapidly, even if the piston rod is under the tension of a load, the piston rod cannot extend out of the cylinder body rapidly, the moving speed of the piston rod is guaranteed, and the safety of the hydraulic system 100 in the operation process is further guaranteed.

It will be appreciated that during operation of the hydraulic system 100, hydraulic fluid is driven by the power plant into the rodless cavity 106 such that the hydraulic fluid pushes the piston to extend the piston rod to lift a load. Use mining dump truck as an example, can realize the lift to the packing box of dump truck through hydraulic system 100, at the in-process that lifts, the piston rod promotes the one end removal of packing box, rotate between the other end of packing box and the automobile body and be connected, along with the rotation of packing box, when the pin joint between packing box and the automobile body is crossed to the focus of packing box, under the action of gravity of packing box, the packing box can produce the pulling force to the piston rod, at this moment, the piston rod need not to provide the motive force for the packing box, the packing box can continue to rotate under the action of gravity, therefore, the hydraulic oil in hydraulic system 100's no pole chamber 106 need not to provide the motive force for the piston, consequently, the pressure of the hydraulic oil in no pole chamber 106 reduces. At this time, the pressure sensed by the first opening 110 is reduced, and accordingly, the opening degree between the second opening 112 and the third opening 114 is reduced, so that the hydraulic oil in the rod cavity 104 cannot flow out quickly, and the piston rod cannot extend out of the cylinder body quickly even under the action of the pulling force of the cargo box, that is, the cargo box is prevented from falling down quickly under the action of gravity, and the safety of the cargo box in the lifting process is improved.

The utility model provides a hydraulic system 100, through the setting of first valve body 108 for first opening 110 of first valve body 108 is connected with hydraulic cylinder 102's no pole chamber 106, and second opening 112 is linked together with hydraulic cylinder 102's pole chamber 104, and second opening 112 is linked together with third opening 114, and hydraulic oil in having the pole chamber 104 can flow out through second opening 112 and third opening 114, and simultaneously, the aperture between second opening 112 and the third opening 114 reduces along with the reduction of the pressure that first opening 110 received. It is realized that when the pressure in the rod-less chamber 106 is small, the opening degree between the second opening 112 and the third opening 114 is small, so that the hydraulic oil cannot flow out from the rod chamber 104 quickly, that is, the piston rod cannot extend out of the cylinder quickly, that is, the counter-load balancing effect on the piston rod is realized. The load connected with the piston rod is prevented from moving rapidly, and the safety of the hydraulic system 100 in the operation process is further ensured.

Specifically, the first valve body 108 comprises a balanced valve.

In the above embodiment, further, as shown in fig. 1, the hydraulic system 100 further includes an oil tank 116, the oil tank 116 is used for storing hydraulic oil, and the oil tank 116 is communicated with the third opening 114 and the rodless cavity 106; further, the hydraulic system 100 further includes a first check valve 118, the first check valve 118 is connected in parallel with the first valve body 108, an inlet of the first check valve 118 is communicated with the oil tank 116, and an outlet of the first check valve 118 is communicated with the rod chamber 104.

In this embodiment, the hydraulic system 100 further includes a tank 116, the tank 116 is used for storing hydraulic oil, the hydraulic oil in the rod chamber 104 and the rod-less chamber 106 of the hydraulic system 100 can be from the tank 116, and the hydraulic oil in the rod chamber 104 and the rod-less chamber 106 can flow out directly to the tank 116. Specifically, the third opening 114 of the first valve body 108 is communicated with the oil tank 116, that is, the hydraulic oil in the rod chamber 104 can flow out into the oil tank 116 during the extension of the piston rod.

Further, the hydraulic system 100 further includes a first check valve 118, the first check valve 118 being connected in parallel with the first valve body 108, and an inlet of the first check valve 118 communicating with the tank 116, and an outlet of the first check valve 118 communicating with the rod chamber 104. That is, the hydraulic oil can flow from the oil tank 116 into the rod chamber 104, and the hydraulic oil in the rod chamber 104 cannot flow through the first check valve 118 and can only flow out of the first valve body 108. In this way, in the process of extending the hydraulic rod, it can be ensured that the hydraulic oil flows out from the first valve body 108, that is, the piston rod cannot extend out quickly, and the safety performance of the hydraulic system 100 is ensured. When the piston rod extends into the cylinder body, hydraulic oil can flow into the rod cavity 104 through the first check valve 118, so that the influence of the first valve body 108 on the inflow of the hydraulic oil is avoided, and the piston rod can smoothly extend into the rod body.

Further, the hydraulic system 100 further includes a first damper 120, and the first damper 120 is disposed between the rodless cavity 106 and the first opening 110.

Specifically, a first damper 120 may be further disposed between the rodless cavity 106 and the first opening 110 of the first valve body 108, and the first damper 120 may buffer the flow of hydraulic oil to some extent, so as to avoid large impact of the hydraulic oil on the first opening 110, and further avoid the first valve body 108 from failing under large impact force of the hydraulic oil, thereby ensuring stable operation of the first valve body 108. I.e., stable operation of the hydraulic system 100 is ensured.

In any of the above embodiments, further, as shown in fig. 2, the number of the first valve bodies 108 is plural, and the plural first valve bodies 108 are connected in parallel.

In this embodiment, the number of the first valve bodies 108 may be provided in plurality, and the plurality of first valve bodies 108 are connected in parallel. Through the arrangement of the plurality of first valve bodies 108 connected in parallel, the flow of the hydraulic oil between the two ends of the first valve bodies 108, that is, the flow of the hydraulic oil between the rod cavity 104 and the oil tank 116, can be ensured, and the telescopic effect of the piston rod can be further ensured.

Further, the hydraulic system 100 may further include a plurality of hydraulic cylinders 102, and the plurality of hydraulic cylinders 102 are connected in parallel, so that the plurality of hydraulic cylinders 102 may be connected through the plurality of first valve bodies 108 connected in parallel, and the safety performance of each hydraulic cylinder 102 is ensured.

Specifically, taking a mining dump truck as an example, the hydraulic system 100 may include two hydraulic cylinders 102 that respectively lift two sides of a cargo box of the dump truck to ensure uniformity of stress on the cargo box during lifting. Meanwhile, the number of the first valve bodies 108 is two, the first openings 110 of the two first valve bodies 108 are respectively connected with the rodless cavities 106 of the two hydraulic oil cylinders 102, the two second openings 112 are respectively communicated with the rodless cavities 106 of the hydraulic oil cylinders 102, and the two third openings 114 are both communicated with the oil tank 116, so that the phenomenon that piston rods of the two hydraulic oil cylinders 102 suddenly stretch out is avoided, and the stability of the cargo box in the lifting process is ensured.

In any of the above embodiments, further, as shown in fig. 2, the hydraulic system 100 further includes a pressure relief pipeline 122, one end of the pressure relief pipeline 122 is communicated with the rodless cavity 106, and the other end of the pressure relief pipeline 122 is communicated with the oil tank 116; the hydraulic system 100 further includes a second valve body 124, where the second valve body 124 is disposed on the pressure relief pipeline 122 and is used to control on/off of the pressure relief pipeline 122.

In this embodiment, hydraulic system 100 also includes a relief line 122, with one end of relief line 122 communicating with rodless chamber 106 and the other end communicating with tank 116. In the operation process of the hydraulic system 100, the piston rod may be impacted by the connected load, so that the piston rod has a tendency of contracting towards the inside of the cylinder body, at this time, the hydraulic oil in the rodless cavity 106 is under the pressure of the piston, and through the arrangement of the pressure relief pipeline 122, when the hydraulic oil in the rodless cavity 106 is under the pressure, that is, when the piston rod is under the impact force of the load, the hydraulic oil in the rodless cavity 106 is discharged out, so that the impact force is buffered, the damage of the hydraulic oil cylinder 102 caused by the impact force is avoided, and meanwhile, the damage of the connecting part between the piston rod and the load under the impact force is also avoided.

Further, a second valve body 124 is further disposed on the pressure relief pipeline 122, and the second valve body 124 is used for controlling on/off of the pressure relief pipeline 122, that is, in a process that the hydraulic system 100 lifts and lowers a load, hydraulic oil needs to enter and exit the rod chamber 104 and the rodless chamber 106 under the action of a power device, and at this time, the second valve body 124 is closed, so that the hydraulic oil is prevented from flowing in the pressure relief pipeline 122, and stability of the hydraulic system 100 in the lifting and lowering processes is ensured. When the second valve body 124 is opened, the rodless cavity 106 and the oil tank 116 can be communicated through a pressure relief pipeline, so that hydraulic oil in the rodless cavity 106 is discharged when the piston rod is impacted by a load, and a buffering effect is achieved.

Similarly, a mining dump truck is taken as an example, in the running process of the dump truck, due to the unevenness of the road surface, the cargo box is bumped, so that the cargo box impacts the piston rod of the hydraulic oil cylinder 102, and the impact of the cargo box can be buffered through the arrangement of the pressure relief pipeline 122, so that the hydraulic system 100 is prevented from being damaged on one hand, and the damage of the connecting part between the cargo box and the piston rod is prevented on the other hand.

Specifically, the second valve body 124 may be a solenoid ball valve, a solenoid spool valve, or a solenoid cone valve.

In any of the above embodiments, further, as shown in fig. 2, the hydraulic system 100 further includes a return line 126, one end of the return line 126 is communicated with the outlet of the second valve body 124, and the other end is communicated with the rod chamber 104; the hydraulic system 100 further includes a second check valve 128, the second check valve 128 being disposed on the return line 126, an inlet of the second check valve 128 being in communication with an outlet of the second valve body 124, an outlet of the second check valve 128 being in communication with the rod chamber 104.

In this embodiment, an oil return line 126 may be further disposed between the outlet of the second valve body 124 and the rod cavity 104, and by setting the oil return line 126, hydraulic oil may flow back into the rod cavity 104 through the oil return line 126, that is, when the piston rod is impacted by a load, hydraulic oil in the rodless cavity 106 flows out through the pressure release line 122, and meanwhile, the hydraulic oil is supplemented into the rodless cavity 106 through the oil return line 126, so that the piston rod is ensured to move in the process of being impacted, that is, the buffering effect of the piston rod on the impact is ensured.

Further, a second check valve 128 is provided on the return line 126, an inlet of the second check valve 128 communicates with an outlet of the second valve body 124, and an outlet of the second check valve 128 communicates with the rod chamber 104. By the arrangement of the second check valve 128, the hydraulic oil in the return line 126 can only enter the rod chamber 104, and the hydraulic oil in the rod chamber 104 cannot enter the return line 126. Therefore, in the lifting process of the hydraulic system 100, the hydraulic oil can flow out of the first valve body 108 and cannot flow out of the oil return pipeline 126, so that the interference of the oil return pipeline 126 on the lifting process of the hydraulic system 100 is avoided, and the stable operation of the hydraulic system is ensured.

Specifically, when the pressure of the hydraulic oil in the oil return line 126 exceeds the conduction pressure of the second check valve 128, the hydraulic oil may flow to the rod cavity 104 through the oil return line 126 to supplement the oil in the rod cavity 104, and when the pressure of the hydraulic oil in the oil return line 126 does not reach the conduction pressure of the second check valve 128, the hydraulic oil in the pressure relief line 122 directly flows into the oil tank 116.

Further, the hydraulic system 100 further includes a second damper 130, and the second damper 130 is disposed between the second valve body 124 and the oil tank 116.

Specifically, by the arrangement of the second damper 130, the smoothness of the hydraulic oil flowing in the pressure relief pipeline 122 and the oil return pipeline 126 can be ensured, a large impact on the second valve body 124 and the second check valve 128 can be avoided, and the stable operation of the hydraulic system 100 can be ensured.

In any of the above embodiments, further, as shown in fig. 2, the hydraulic system 100 further includes a first pressure detecting member 132 and a second pressure detecting member 134, wherein the first pressure detecting member 132 is in communication with the rodless chamber 106 for detecting the pressure of the rodless chamber 106; the second pressure sensing member 134 is in communication with the rod chamber 104 for sensing the pressure in the rod chamber 104.

In this embodiment, through the arrangement of the first pressure detecting element 132, the pressure of the hydraulic oil in the rodless cavity 106 can be detected, so that an operator can obtain the pressure in the rodless cavity 106 in time, and the fault of the hydraulic system 100 caused by the excessive pressure in the rodless cavity 106 is avoided. Specifically, the first pressure detection chamber may be disposed on a conduit in communication with the rodless cavity 106.

Correspondingly, through the setting of second pressure detection spare 134, can realize detecting the pressure of the hydraulic oil in having the pole chamber 104 to guarantee that operating personnel can be timely the acquisition has the pressure in the pole chamber 104, avoid having the pole chamber 104 internal pressure too big to cause hydraulic system 100 trouble. Specifically, the second pressure sensing chamber may be disposed on a conduit in communication with the rod chamber 104.

According to a second aspect of the present invention, a vehicle is proposed, comprising a hydraulic system 100 as defined in any one of the above-mentioned claims.

The utility model provides a vehicle, because of included hydraulic system 100 of any one of above-mentioned technical scheme, consequently, this vehicle has included whole beneficial effect of above-mentioned hydraulic system 100, no longer gives unnecessary details here.

In particular, the vehicle may comprise a mining dump truck.

In the present invention, the term "plurality" means at least two or more than two unless expressly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic system, comprising:

the hydraulic oil cylinder comprises a rod cavity and a rodless cavity;

the first valve body comprises a first opening, a second opening and a third opening, the first opening is connected with the rod cavity, the second opening is communicated with the rodless cavity, and the third opening is used for flowing out of hydraulic oil;

wherein the second opening is in communication with the third opening, and a flow rate between the second opening and the third opening decreases as a pressure experienced by the first opening decreases.

2. The hydraulic system of claim 1, further comprising:

the oil tank is used for storing hydraulic oil, and is communicated with the third opening and the rodless cavity;

the first check valve is connected with the first valve body in parallel, an inlet of the first check valve is communicated with the oil tank, and an outlet of the first check valve is communicated with the rod cavity.

3. The hydraulic system of claim 1, further comprising:

a first damper disposed between the rodless cavity and the first opening.

4. The hydraulic system according to claim 1, wherein the number of the first valve bodies is plural, and the plural first valve bodies are connected in parallel.

5. The hydraulic system of claim 2, further comprising:

one end of the pressure relief pipeline is communicated with the rodless cavity, and the other end of the pressure relief pipeline is communicated with the oil tank;

and the second valve body is arranged on the pressure relief pipeline and used for controlling the on-off of the pressure relief pipeline.

6. The hydraulic system of claim 5, further comprising:

one end of the oil return pipeline is communicated with the outlet of the second valve body, and the other end of the oil return pipeline is communicated with the rod cavity;

and the second one-way valve is arranged on the oil return pipeline, an inlet of the second one-way valve is communicated with an outlet of the second valve body, and an outlet of the second one-way valve is communicated with the rod cavity.

7. The hydraulic system of claim 5, further comprising:

and the second damper is arranged between the second valve body and the oil tank.

8. The hydraulic system of any one of claims 1-7, further comprising:

the first pressure detection piece is communicated with the rodless cavity and is used for detecting the pressure of the rodless cavity;

and the second pressure detection piece is communicated with the rod cavity and is used for detecting the pressure of the rod cavity.

9. The hydraulic system of any one of claims 1-7, wherein the first valve body comprises a balancing valve.

10. A vehicle, characterized by comprising:

a hydraulic system as claimed in any one of claims 1 to 9.