CN213138608U

CN213138608U - Tarpaulin mechanism hydraulic system and dumper

Info

Publication number: CN213138608U
Application number: CN202021758397.8U
Authority: CN
Inventors: 刘开宇; 黄庆谷
Original assignee: Sany Special Vehicle Co Ltd
Current assignee: Sany Special Vehicle Co Ltd
Priority date: 2020-08-21
Filing date: 2020-08-21
Publication date: 2021-05-07
Anticipated expiration: 2030-08-21

Abstract

The utility model provides a tarpaulin mechanism hydraulic system and tipper. Wherein, tarpaulin mechanism hydraulic system includes: an oil supply assembly; the output end of the hydraulic motor is connected with a tarpaulin mechanism of the dump truck to drive the tarpaulin mechanism to move; the control valve group is respectively connected with the oil supply assembly and the hydraulic motor through pipelines so as to control the oil flow direction of the hydraulic motor; and the high-pressure filter is arranged in a pipeline between the oil supply assembly and the control valve group and used for filtering hydraulic oil. The technical scheme of the utility model, accessible high pressure filter filters hydraulic fluid, and the filter fineness is high, can filter the impurity of tiny granule to prevent that the impurity of sneaking into in the hydraulic fluid and lead to tarpaulin mechanism hydraulic system to appear blockking up or jamming phenomenon, can reduce the impaired possibility of valves and hydraulic motor simultaneously, be favorable to prolonging hydraulic component's life.

Description

Tarpaulin mechanism hydraulic system and dumper

Technical Field

The application relates to the technical field of hydraulic control of dumper trucks, in particular to a tarpaulin mechanism hydraulic system and a dumper truck.

Background

At present, a dump truck is mostly used for transporting muck or bulk materials, and in order to prevent environment pollution caused by dust and material throwing in the transportation process, a container of the dump truck is mostly provided with a tarpaulin mechanism so as to seal the container in the transportation process and prevent muck or bulk materials in the container from being thrown. The tarpaulin mechanism of current tipper adopts hydraulic control more, and hydraulic component among the hydraulic system is mostly accurate component, and in hydraulic system working process, sneak into partial impurity easily in the hydraulic fluid, cause hydraulic system to block up or the jamming easily, cause hydraulic component easily impaired even, influence hydraulic system's normal operating, shortened hydraulic component's life simultaneously. The prior art provides a scheme of arranging a filter at an oil suction end or an execution end of a hydraulic system, but the filter in the scheme belongs to low-pressure filtering equipment, the pressure which can be borne by the filter is limited, the filtering precision is not high, and the protection effect on a hydraulic element is limited.

SUMMERY OF THE UTILITY MODEL

According to an embodiment of the present invention, it is intended to improve at least one of technical problems existing in the prior art or the related art.

To this end, it is an object of embodiments according to the present invention to provide a tarpaulin mechanism hydraulic system.

According to the utility model discloses another aim at provides a tipper.

In order to achieve the above object, according to an embodiment of a first aspect of the present invention, there is provided a tarpaulin mechanism hydraulic system, including: an oil supply assembly; the output end of the hydraulic motor is connected with a tarpaulin mechanism of the dump truck to drive the tarpaulin mechanism to move; the control valve group is respectively connected with the oil supply assembly and the hydraulic motor through pipelines so as to control the oil flow direction of the hydraulic motor; and the high-pressure filter is arranged in a pipeline between the oil supply assembly and the control valve group and used for filtering hydraulic oil.

According to the utility model discloses the embodiment of the first aspect, tarpaulin mechanism hydraulic system includes fuel feeding unit, hydraulic motor, valves and high pressure filter. The oil supply assembly is a power source of a hydraulic system of the tarpaulin mechanism and is used for supplying hydraulic oil. The hydraulic motor is an actuating mechanism of a tarpaulin mechanism hydraulic system, and the output end of the hydraulic motor is used for being connected with the tarpaulin mechanism of the dump truck, so that when the tarpaulin mechanism hydraulic system works, the hydraulic motor outputs power to drive the tarpaulin mechanism to move, and a container of the dump truck is opened or closed. The control valve group is respectively connected with the oil supply assembly and the hydraulic motor through pipelines, hydraulic oil supplied by the oil supply assembly can flow to the hydraulic motor through the pipelines, and the control valve group can adjust the oil flow direction of the hydraulic motor, so that the output state of the output end of the hydraulic motor is controlled, and the tarpaulin mechanism is driven to move in different directions. Through set up high pressure filter in connecting the pipeline between fuel feeding unit and the valve unit, in order to filter the hydraulic pressure fluid by fuel feeding unit flow direction control valves and hydraulic motor, prevent that the impurity of sneaking into from flowing into valve unit or hydraulic motor in the hydraulic pressure fluid, wherein, oil feeding unit's play oil end is located to high pressure filter, can bear tarpaulin mechanism hydraulic system's operating pressure, and filter fineness is high, can filter the impurity of tiny granule, can prevent effectively that tarpaulin mechanism hydraulic system from appearing blockking up or jamming phenomenon and influencing normal operating, still can reduce the impaired possibility of valve unit and hydraulic motor, be favorable to increase of service life.

In addition, according to the utility model discloses tarpaulin mechanism hydraulic system among the above-mentioned technical scheme of embodiment can also have following additional technical characteristics:

in the above technical solution, the high pressure filter includes: the filter oil duct is arranged in the shell; the filter element is detachably arranged in the filter oil duct so as to filter oil flowing through the filter oil duct; the bypass valve is arranged in the shell and is respectively connected with the oil inlet and the oil outlet of the filtering oil duct so as to conduct the filtering oil duct when the filter element is blocked.

In this solution, the high pressure filter comprises a housing, a filter element and a bypass valve. Be equipped with the filter oil duct in the casing, the filter core is located in the filter oil duct to when hydraulic fluid flows through the filter oil duct, filter hydraulic fluid through the filter core, with the impurity of filtering in the hydraulic fluid, especially the less impurity of granule, prevent to cause the damage to valve unit and hydraulic motor. Wherein, the filter core can be dismantled with the casing and be connected to in change the filter core, pile up and cause the jam with the filterable impurity of prevention filter core. Through setting up the bypass valve that links to each other with the oil inlet and the oil-out of filtering oil duct to as reserve oil duct, break through the bypass valve and switch on filtering oil duct when the filter core takes place to block up, make hydraulic fluid can normally flow through the bypass valve, in order to avoid interrupting tarpaulin mechanism hydraulic system's normal operating.

It can be understood that if the filter core takes place to block up, need change the operation, if take place to block up at tarpaulin mechanism hydraulic system operation in-process, change the filter core immediately then need interrupt normal operation, influence the operating efficiency. Through set up the bypass valve in high pressure filter, in case take place filter core blocking phenomenon, usable bypass valve makes high pressure filter can normally switch on, need not to break current operation, in time carries out filter core change operation again after the operation is accomplished, but save time raises the efficiency.

In the technical scheme, the filtering precision range of the filter element is 10-20 μm.

In the technical scheme, the filter precision range of the filter element of the high-pressure filter is 10-20 microns so as to block impurities with the particle diameter ranging from 10-20 microns, further improve the filter precision, eliminate the impurities which are mixed in the hydraulic oil and can damage or block the hydraulic element, and enhance the protection effect of the high-pressure filter on the hydraulic element.

In the above technical solution, the oil supply unit includes: an oil tank; the oil inlet of the oil pump is connected with the oil tank, and the oil outlet of the oil pump is connected with the high-pressure filter.

In the technical scheme, the oil tank can store hydraulic oil to be used as an oil source of a hydraulic system of the tarpaulin mechanism. The oil pump is connected with the oil tank through the oil inlet that sets up the oil pump as pumping element to when the oil pump work, outwards pump the hydraulic pressure fluid in the oil tank. Wherein, the oil-out and the high pressure filter of oil pump are connected to filter the hydraulic pressure fluid of oil pump pumping, can understand, the hydraulic pressure fluid in the oil tank probably sneaks into impurity, and the oil pump also can produce partial impurity at the course of the work, and accessible high pressure filter filters above impurity together.

In the above technical solution, the control valve group includes: two working oil ports of the reversing valve are respectively connected with two oil ports of the hydraulic motor through pipelines, an oil inlet of the reversing valve is connected with the high-pressure filter through a pipeline, an oil return port of the reversing valve is connected with an oil tank through a pipeline, and the reversing valve is used for adjusting the flow direction of oil in the hydraulic motor.

In this technical scheme, including the switching-over valve in the valve unit, two hydraulic fluid mouths through setting up the switching-over valve are connected with two hydraulic fluid mouths of hydraulic motor through the pipeline respectively, and the oil inlet of switching-over valve passes through the pipeline and links to each other with high pressure filter, and the oil return opening of switching-over valve passes through the pipeline and links to each other with the oil tank to make the hydraulic fluid of oil pump pumping after high pressure filter filters, accessible switching-over valve flows to hydraulic motor, drives hydraulic motor work, and flow back to in the oil tank. The direction of the oil in the hydraulic motor can be adjusted by reversing the reversing valve, the working state of the hydraulic motor is controlled, and the movement direction of the tarpaulin mechanism is further controlled.

It should be noted that the reversing valve can be a three-position four-way reversing valve; further, the reversing valve can be a three-position four-way electromagnetic valve with an H-shaped middle position function, so that reversing control is facilitated.

In the above technical solution, the control valve group further includes: the oil inlet of the overflow valve is connected into a pipeline between the high-pressure filter and the oil inlet of the reversing valve, the oil outlet of the overflow valve is connected with the oil tank through the pipeline, and the overflow valve is conducted when the pressure of the oil reaches a pressure threshold value so as to realize overflow pressure relief.

In the technical scheme, the overflow valve is arranged in the control valve group and used for overflowing and pressure relief. An oil inlet of the overflow valve is connected to a pipeline connecting the high-pressure filter and an oil inlet of the reversing valve, and an oil outlet of the overflow valve is connected to an oil tank through a pipeline; the overflow valve can preset a pressure threshold, when the pressure of the oil liquid reaches the pressure threshold, the overflow valve is conducted, so that a part of hydraulic oil liquid flows into the oil tank through the overflow valve, the pressure of the hydraulic oil liquid flowing to the reversing valve is reduced, the effect of overflow pressure relief is achieved, the reversing valve or other hydraulic elements are prevented from being damaged due to overhigh pressure of the hydraulic oil liquid, and the service life of the hydraulic elements is prolonged. It should be noted that the reversing valve and the overflow valve may be disposed in the same valve body to form an integrated valve assembly.

In the above technical solution, the control valve group further includes: the check valve is arranged in a pipeline between the high-pressure filter and the oil inlet of the reversing valve, so that oil can only flow to the reversing valve in a one-way mode from the high-pressure filter; the reversing valve, the overflow valve and the one-way valve are arranged in the same valve body, or the reversing valve and the overflow valve are arranged in the same valve body.

In the technical scheme, the check valve is arranged in the pipeline connecting the high-pressure filter and the oil inlet of the reversing valve in the control valve group, and the check valve can be conducted only when hydraulic oil flows from the high-pressure filter to the reversing valve, so that the pipeline is conducted in a one-way mode, the hydraulic oil is prevented from flowing back to the high-pressure filter from the reversing valve, and the stability of a system is favorably kept. The reversing valve, the overflow valve and the one-way valve can be arranged in the same valve body, or the reversing valve and the overflow valve are arranged in the same valve body, so that an integrated valve group is formed, and the system and connection are simplified.

In the above technical solution, the tarpaulin mechanism hydraulic system further includes: and the brake assembly is connected to the hydraulic motor so as to brake the hydraulic motor.

In this technical scheme, through setting up the brake assembly who is connected with hydraulic motor to brake hydraulic motor according to the operation needs, so that tarpaulin mechanism remains stable. It can be understood that the tarpaulin mechanism should remain stable during loading, unloading and transportation of the dump truck, otherwise normal operation is easily affected, especially during unloading, after the container of the dump truck is lifted, the tarpaulin mechanism easily drives the hydraulic motor to rotate reversely under the action of gravity, and the braking assembly can effectively prevent the hydraulic motor from rotating randomly, so that the tarpaulin mechanism remains stable.

In the above technical solution, the brake assembly includes: the spring reset oil cylinder is connected with the hydraulic motor, a piston rod of the spring reset oil cylinder is arranged corresponding to the hydraulic motor, a brake piece is arranged on the piston rod and used for braking the hydraulic motor, a reset spring is arranged in a rodless cavity of the spring reset oil cylinder, and two ends of the reset spring are respectively connected with the piston rod and a cylinder barrel of the spring reset oil cylinder so as to drive the piston rod to extend out; two oil inlets of the shuttle valve are respectively connected into two pipelines connected with the hydraulic motor through pipelines, and an oil outlet of the shuttle valve is communicated with a rod cavity of the spring reset oil cylinder through a pipeline.

In the technical scheme, the brake assembly comprises a shuttle valve and a spring return oil cylinder. The spring reset oil cylinder is connected to the hydraulic motor, a piston rod of the spring reset oil cylinder is arranged corresponding to a rotating shaft of the hydraulic motor, a brake disc is arranged on the piston rod, the brake disc is in contact with the rotating shaft of the hydraulic motor in an initial state, the hydraulic motor is kept static through friction force, and braking of the hydraulic motor is achieved. The spring reset oil cylinder is characterized in that a reset spring is arranged in a rodless cavity of the spring reset oil cylinder, specifically, two ends of the reset spring are respectively connected with the piston rod and the cylinder barrel, and the piston rod is driven to extend out under the elastic force action of the reset spring so that the brake disc is in contact with a rotating shaft of the hydraulic motor. The two oil inlets of the shuttle valve are respectively connected into two pipelines connected with the hydraulic motor through pipelines, the oil outlet of the shuttle valve is connected to the rod cavity of the spring reset oil cylinder through a pipeline, so that when the oil supply assembly supplies hydraulic oil to the hydraulic motor, pressure difference is generated between the two oil inlets of the shuttle valve, the oil inlet and the oil outlet of the shuttle valve are conducted, at the moment, the hydraulic oil flows into the rod cavity of the spring reset oil cylinder, the piston rod is driven to contract in the cylinder barrel, and then the braking of the braking piece on the hydraulic motor is relieved, so that the hydraulic motor can normally operate. The hydraulic motor can keep static when in a non-working state, and the tarpaulin mechanism keeps stable so as to prevent interference to the operation of the dumper.

An embodiment according to a second aspect of the present disclosure provides a dump truck, including: a vehicle body; the container is arranged on the vehicle body and is rotatably connected with the vehicle body; the lifting mechanism is arranged on the vehicle body, and the lifting end of the lifting mechanism is connected with the container so as to drive the container to rotate relative to the vehicle body and realize the lifting of the container; the tarpaulin mechanism is arranged at the top of the container and is movably connected with the container, and the tarpaulin mechanism realizes opening or closing of the container through movement relative to the container; in the tarpaulin mechanism hydraulic system of any of the embodiments of the first aspect, the oil supply unit and the high pressure filter of the tarpaulin mechanism hydraulic system are disposed on the vehicle body, the hydraulic motor of the tarpaulin mechanism hydraulic system is disposed on the cargo box, and the output end of the hydraulic motor is in transmission connection with the tarpaulin mechanism to drive the tarpaulin mechanism to move relative to the cargo box.

In this technical solution, the dump truck includes a body, a cargo box, a lifting mechanism, a tarpaulin mechanism, and the tarpaulin mechanism hydraulic system in the embodiment of the first aspect. The container is arranged on the vehicle body so as to realize cargo transportation through the running of the vehicle body; the container is rotatably connected with the vehicle body, and the lifting end of the lifting mechanism is connected with the container, so that the container is driven to rotate relative to the vehicle body through the lifting mechanism, the lifting of the container is realized, and the discharging operation is performed. The top of packing box is equipped with tarpaulin mechanism, and tarpaulin mechanism and packing box swing joint to through the motion of tarpaulin mechanism for the packing box in order to open packing box top or closing cap packing box top, in order to prevent that the material from outwards spilling by the top of packing box in the transportation, be favorable to environmental protection.

An oil supply assembly and a high-pressure filter of a hydraulic system of the tarpaulin mechanism are arranged on the vehicle body; when the hydraulic system of the tarpaulin mechanism works, the hydraulic motor drives the tarpaulin mechanism to move relative to the container, and then the top of the container or the top of the container is opened and covered.

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

Drawings

The above and/or additional aspects and advantages of embodiments 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 view of a tarpaulin mechanism hydraulic system according to an embodiment of the present invention;

fig. 2 shows a schematic view of a dump truck according to an embodiment of the invention;

fig. 3 shows a schematic view of a high pressure filter according to an embodiment of the invention;

fig. 4 shows a schematic view of a tarpaulin mechanism hydraulic system according to an embodiment of the present invention;

fig. 5 shows a schematic view of a tarpaulin mechanism hydraulic system according to an embodiment of the present invention;

fig. 6 shows a schematic view of a tarpaulin mechanism hydraulic system according to an embodiment of the present invention;

fig. 7 shows a schematic diagram of a tarpaulin mechanism hydraulic system according to an embodiment of the present invention;

fig. 8 shows a schematic diagram of a tarpaulin mechanism hydraulic system according to an embodiment of the present invention;

fig. 9 shows a schematic diagram of a tarpaulin mechanism hydraulic system according to an embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the names of the components in fig. 1 to 9 is as follows:

the hydraulic system comprises a tarpaulin mechanism, an 11 oil supply assembly, a 111 oil tank, a 112 oil pump, a 12 hydraulic motor, a 13 control valve group, a 131 reversing valve, a 132 overflow valve, a 133 one-way valve, a 14 high-pressure filter, a 141 shell, a 142 filter element, a 143 filter oil channel, a 144 bypass valve, a 15 brake assembly, a 151 spring return oil cylinder, a 1511 piston rod, a 1512, a 1513 brake block, a 1514 return spring, a 152 shuttle valve, a 2 dump truck, a 21 truck body, a 22 cargo box, a 23 lifting mechanism and a 24 tarpaulin mechanism.

Detailed Description

In order to make the above objects, features and advantages according to the embodiments of the present invention more clearly understood, embodiments according to 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 embodiments according to the invention, however, embodiments according to the invention may be practiced in other ways than those described herein, and therefore the scope of protection of this application is not limited by the specific embodiments disclosed below.

A tarpaulin mechanism hydraulic system and a dump truck according to some embodiments of the present invention will be described with reference to fig. 1 to 9.

Example one

The embodiment provides a tarpaulin mechanism hydraulic system 1 which can be used for a dump truck 2 with a tarpaulin mechanism 24.

As shown in fig. 1 and 2, the tarpaulin mechanism hydraulic system 1 includes an oil feeding block 11, a hydraulic motor 12, a control valve block 13, and a high pressure filter 14. The oil supply assembly 11 is used as a power source of the hydraulic system 1 of the tarpaulin mechanism and supplies hydraulic oil required by the operation of the system. The hydraulic motor 12 is an actuating mechanism of the tarpaulin mechanism hydraulic system 1 and is connected with the oil supply assembly 11 through a pipeline so as to drive the hydraulic motor 12 to work by utilizing hydraulic oil; the output end of the hydraulic motor 12 is used for connecting with a tarpaulin mechanism 24 of the dump truck 2, so that power is output to the tarpaulin mechanism 24 through the hydraulic motor 12 to drive the tarpaulin mechanism 24 to move, and the cargo box 22 of the dump truck 2 is opened or closed.

The control valve group 13 is arranged in a pipeline between the oil supply assembly 11 and the hydraulic motor 12, and the control valve group 13 is respectively connected with the oil supply assembly 11 and the hydraulic motor 12; when the hydraulic oil supplied by the oil supply unit 11 flows to the hydraulic motor 12, the flow direction of the hydraulic oil of the hydraulic motor 12 is adjusted by the control valve group 13, so that the output state of the output end of the hydraulic motor 12 is controlled to drive the tarpaulin mechanism 24 to move in different directions. A high pressure filter 14 is provided in a line connecting the oil feeding unit 11 and the control valve block 13 to filter the hydraulic oil supplied from the oil feeding unit 11.

The high pressure filter 14 in this embodiment is located the oil outlet end of the oil supply unit 11, can bear the working pressure of the tarpaulin mechanism hydraulic system 1, and the filter accuracy is high, can filter fine particles of impurities, can effectively prevent the hydraulic oil from being mixed with impurities to cause the tarpaulin mechanism hydraulic system 1 to be blocked or stuck, can reduce the possibility of damage to the control valve group 13 and the hydraulic motor 12, and is favorable for prolonging the service life of the hydraulic element.

Example two

The embodiment provides a hydraulic system 1 of a tarpaulin mechanism, which is further improved on the basis of the first embodiment.

As shown in fig. 1 to 3, the high pressure filter 14 specifically includes a housing 141, a filter element 142, and a bypass valve 144. A filter oil passage 143 is disposed in the housing 141, an oil inlet of the filter oil passage 143 is connected to the oil supply unit 11, and an oil outlet of the filter oil passage 143 is connected to the control valve group 13. The filter element 142 is disposed in the filter oil passage 143 to filter the hydraulic oil flowing through the filter oil passage 143, so as to remove impurities, particularly small-particle impurities, in the hydraulic oil, so as to prevent the system from being affected by normal operation, and prevent damage to the control valve group 13 and the hydraulic motor 12. The filter element 142 is detachably connected to the housing 141 to facilitate replacement of the filter element 142, so as to prevent impurities filtered by the filter element 142 from being accumulated and clogging. The filter element 142 of the high-pressure filter 14 has a filtering precision range of 10 μm to 20 μm to block impurities with particle diameters in the range of 10 μm to 20 μm, so as to further improve the filtering precision, eliminate impurities which are mixed in the hydraulic oil and can damage or block hydraulic elements, and enhance the protection effect of the high-pressure filter 14 on the hydraulic elements.

In addition, a bypass valve 144 is further disposed in the housing 141, and the bypass valve 144 is connected to an oil inlet and an oil outlet of the filter oil passage 143 as a spare oil passage. When the filter element 142 is blocked, hydraulic oil cannot flow through the filter element, and at the moment, the bypass valve 144 is communicated, so that the oil inlet and the oil outlet of the filter oil passage 143 are communicated, the hydraulic oil normally flows through the bypass valve 144, and the normal operation of the hydraulic system 1 of the tarpaulin mechanism is not required to be interrupted. And the filter element 142 is replaced after the operation is finished, so that the time can be saved, and the efficiency can be improved.

EXAMPLE III

As shown in fig. 2 and 4, the oil supply unit 11 specifically includes an oil tank 111 and an oil pump 112. The oil tank 111 serves as an oil source of the tarpaulin mechanism hydraulic system 1 for storing hydraulic oil. An oil inlet of the oil pump 112 is connected with the oil tank 111 to serve as a pumping element for pumping hydraulic oil in the oil tank 111 outwards, so that the hydraulic oil is used for driving the tarpaulin mechanism hydraulic system 1 to operate. An oil outlet of the oil pump 112 is connected with the high-pressure filter 14, so as to filter the hydraulic oil pumped by the oil pump 112 through the high-pressure filter 14, and further remove impurities generated in the working process of the oil pump 112.

Example four

The embodiment provides a hydraulic system 1 of a tarpaulin mechanism, and is further improved on the basis of the third embodiment.

As shown in fig. 2 and 4, the control valve group 13 includes a direction change valve 131, and specifically, the direction change valve 131 is a three-position four-way solenoid valve having an H-type neutral function. Two working oil ports of the reversing valve 131 are respectively connected with two oil ports of the hydraulic motor 12 through pipelines, an oil inlet of the reversing valve 131 is connected with the high-pressure filter 14 through a pipeline, and an oil return port of the reversing valve 131 is connected with the oil tank 111 through a pipeline.

In the operation process of the tarpaulin mechanism hydraulic system 1, the hydraulic oil pumped by the oil pump 112 flows to the hydraulic motor 12 through the reversing valve 131 after being filtered by the high pressure filter 14, so as to drive the hydraulic motor 12 to work, and then the hydraulic oil flows back to the oil tank 111. When the direction change valve 131 is in the left position and the right position, the flow direction of the hydraulic fluid in the hydraulic motor 12 is opposite, and the flow direction of the hydraulic fluid in the hydraulic motor 12 is adjusted by the direction change valve 131 to control the working state of the hydraulic motor 12, and further control the movement direction of the tarpaulin mechanism 24, so that the tarpaulin mechanism 24 opens the cargo box 22 or closes the cargo box 22.

It should be noted that the type of the reversing valve 131 is not limited to the three-position four-way solenoid valve in the present embodiment, and may be other types of valves capable of performing the reversing function.

EXAMPLE five

The embodiment provides a hydraulic system 1 of a tarpaulin mechanism, and is further improved on the basis of the fourth embodiment.

As shown in fig. 2 and 5, the control valve group 13 further includes an overflow valve 132 to perform overflow relief on the tarpaulin mechanism hydraulic system 1. An oil inlet of the overflow valve 132 is connected to a pipeline between the high-pressure filter 14 and an oil inlet of the reversing valve 131, and an oil outlet of the overflow valve 132 is connected to the oil tank 111 through a pipeline. The relief valve 132 presets a pressure threshold, and when the oil pressure reaches the pressure threshold, the relief valve 132 is turned on.

The overflow valve 132 in this embodiment can make a part of hydraulic oil flow back to the oil tank 111 through the overflow valve 132, and reduce the pressure of the hydraulic oil flowing to the direction switching valve 131, so as to perform the function of overflow pressure relief when the pressure of the hydraulic oil is too high, thereby preventing the direction switching valve 131 or other hydraulic components from being damaged due to the too high pressure of the hydraulic oil, and being beneficial to prolonging the service life of the hydraulic components.

It should be noted that the reversing valve 131 and the excess flow valve 132 may be disposed within the same valve body to form an integrated valve assembly.

EXAMPLE six

The embodiment provides a hydraulic system 1 of a tarpaulin mechanism, which is further improved on the basis of the fifth embodiment.

As shown in fig. 2 and 6, the control valve group 13 further includes a check valve 133. The check valve 133 is disposed in a pipeline connecting the high pressure filter 14 and the oil inlet of the reversing valve 131, and the check valve 133 is only conducted when the hydraulic oil flows from the high pressure filter 14 to the reversing valve 131, so as to realize one-way conduction of the pipeline. The check valve 133 can effectively prevent the hydraulic oil from flowing back to the high-pressure filter 14 from the reversing valve 131, which is beneficial to keeping the system stable.

It should be noted that the reversing valve 131, the overflow valve 132 and the check valve 133 may be disposed in the same valve body (as shown in fig. 6), forming a three-valve set; of course, the selector valve 131 and the relief valve 132 may be provided in the same valve body to form two valve groups, and the check valve 133 may be connected to the two valve groups through a pipe (as shown in fig. 7).

EXAMPLE seven

The embodiment provides a hydraulic system 1 of a tarpaulin mechanism, which is further improved on the basis of the sixth embodiment.

As shown in fig. 2 and 7, the hydraulic system 1 of the tarpaulin mechanism further comprises a brake assembly 15, and the brake assembly 15 is connected with the hydraulic motor 12 to brake the hydraulic motor 12 according to the operation requirement so as to keep the tarpaulin mechanism 24 stable.

Specifically, the brake assembly 15 includes a spring return cylinder 151 and a shuttle valve 152. The spring return oil cylinder 151 is connected to the hydraulic motor 12, and a piston rod 1511 of the spring return oil cylinder 151 is provided with a brake disc 1513 which is arranged corresponding to the hydraulic motor 12; in the initial state, the brake pads 1513 are in contact with the rotating shaft of the hydraulic motor 12, and the hydraulic motor 12 is held stationary by frictional force, thereby braking the hydraulic motor 12. A return spring 1514 is arranged in a rodless cavity of the spring return oil cylinder 151, two ends of the return spring 1514 are respectively connected with a piston rod 1511 and a cylinder 1512, and the piston rod 1511 extends out under the elastic force action of the return spring 1514, so that a brake piece 1513 is in contact with a rotating shaft of the hydraulic motor 12, and braking is realized.

Shuttle valve 152 includes two oil inlets and one oil outlet; two oil inlets of the shuttle valve 152 are respectively connected into two pipelines connected with the hydraulic motor 12 through pipelines, and an oil outlet of the shuttle valve 152 is connected to a rod cavity of the spring return oil cylinder 151 through a pipeline. When the hydraulic motor 12 is not supplied with oil, the pressures in the two lines connecting the hydraulic motor 12 are the same, and the oil inlet of the shuttle valve 152 is in a closed state. When the oil supply unit 11 supplies hydraulic oil to the hydraulic motor 12, a pressure difference is generated between two oil inlets of the shuttle valve 152, and the oil inlet of the shuttle valve 152 on the side with a larger pressure is connected, at this time, the hydraulic oil flows into the rod chamber of the spring return cylinder 151 through the shuttle valve 152, the drive piston rod 1511 contracts in the cylinder 1512 to release the brake of the brake pad 1513 on the hydraulic motor 12, and at the same time, the hydraulic oil flows into the hydraulic motor 12, and the hydraulic motor 12 is driven to operate normally.

The brake assembly 15 in this embodiment can keep the hydraulic motor 12 stationary when in a non-operating state, and keep the tarpaulin mechanism 24 stable, so as to prevent interference with normal operation of the dump truck 2, especially when the dump truck 2 is unloading, and after the cargo box 22 of the dump truck 2 is lifted, the tarpaulin mechanism 24 is kept stable under the action of the brake assembly 15, and can effectively prevent the hydraulic motor 12 from rotating reversely under the action of gravity of the tarpaulin mechanism 24.

Example eight

As shown in fig. 2, 3 and 8, the tarpaulin mechanism hydraulic system 1 includes an oil feeding block 11, a hydraulic motor 12, a valve block 13, a high pressure filter 14 and a brake block 15. The oil supply assembly 11 is used as a power source of the hydraulic system 1 of the tarpaulin mechanism and supplies hydraulic oil required by the operation of the system. The hydraulic motor 12 is an actuating mechanism of the tarpaulin mechanism hydraulic system 1, and is used for driving the tarpaulin mechanism 24 of the dump truck 2 to move, and opening or closing the cargo box 22 of the dump truck 2. The control valve group 13 is disposed in a pipeline between the oil supply assembly 11 and the hydraulic motor 12 to control the oil flow direction of the hydraulic motor 12. The high pressure filter 14 is used to filter the hydraulic oil supplied from the oil supply unit 11. The brake assembly 15 is used to brake the hydraulic oil pump 112 and stabilize the tarpaulin mechanism 24.

The oil supply assembly 11 specifically includes an oil tank 111 and an oil pump 112. The oil tank 111 serves as an oil source of the tarpaulin mechanism hydraulic system 1 for storing hydraulic oil. An oil inlet of the oil pump 112 is connected with the oil tank 111 to serve as a pumping element for pumping hydraulic oil in the oil tank 111 outwards, so that the hydraulic oil is used for driving the tarpaulin mechanism hydraulic system 1 to operate. An oil outlet of the oil pump 112 is connected with the high-pressure filter 14, so as to filter the hydraulic oil pumped by the oil pump 112 through the high-pressure filter 14, and further remove impurities generated in the working process of the oil pump 112.

The control valve group 13 specifically includes a direction change valve 131, an overflow valve 132, and a check valve 133. The change valve 131 is a three-position four-way solenoid valve having an H-type neutral position function. Two working oil ports of the reversing valve 131 are respectively connected with two oil ports of the hydraulic motor 12 through pipelines, an oil inlet of the reversing valve 131 is connected with the high-pressure filter 14 through a pipeline, and an oil return port of the reversing valve 131 is connected with the oil tank 111 through a pipeline. An oil inlet of the overflow valve 132 is connected to a pipeline between the high-pressure filter 14 and an oil inlet of the reversing valve 131, and an oil outlet of the overflow valve 132 is connected to the oil tank 111 through a pipeline. The overflow valve 132 presets a pressure threshold, when the oil pressure reaches the pressure threshold, the overflow valve 132 is conducted, so that part of hydraulic oil flows back to the oil tank 111 through the overflow valve 132, the pressure of the hydraulic oil flowing to the reversing valve 131 is reduced, and the effect of overflow pressure relief is achieved when the pressure of the hydraulic oil is too high, so that the reversing valve 131 or other hydraulic elements are prevented from being damaged due to the fact that the pressure of the hydraulic oil is too high, and the service life of the hydraulic elements is prolonged. The check valve 133 is disposed in a pipeline connecting the high pressure filter 14 and the oil inlet of the reversing valve 131, and the check valve 133 is only conducted when the hydraulic oil flows from the high pressure filter 14 to the reversing valve 131, so as to realize one-way conduction of the pipeline. The check valve 133 can effectively prevent the hydraulic oil from flowing back to the high-pressure filter 14 from the reversing valve 131, which is beneficial to keeping the system stable. The reversing valve 131, the overflow valve 132 and the check valve 133 may be disposed in the same valve body (as shown in fig. 8), forming three valve sets.

The high pressure filter 14 is provided in a line connecting the oil pump 112 and the check valve 133 to filter the hydraulic oil supplied from the oil pump 112. The high pressure filter 14 specifically includes a housing 141, a filter element 142, and a bypass valve 144. A filter oil passage 143 is arranged in the housing 141, an oil inlet of the filter oil passage 143 is connected with the oil pump 112, and an oil outlet of the filter oil passage 143 is connected with the check valve 133. The filter element 142 is disposed in the filter oil passage 143 to filter the hydraulic oil flowing through the filter oil passage 143, so as to remove impurities, particularly small-particle impurities, in the hydraulic oil, so as to prevent the system from being affected by normal operation, and prevent damage to the control valve group 13 and the hydraulic motor 12. The filter element 142 is detachably connected to the housing 141 to facilitate replacement of the filter element 142, so as to prevent impurities filtered by the filter element 142 from being accumulated and clogging. The filter element 142 of the high-pressure filter 14 has a filtering precision range of 10 μm to 20 μm to block impurities with particle diameters in the range of 10 μm to 20 μm, so as to further improve the filtering precision, eliminate impurities which are mixed in the hydraulic oil and can damage or block hydraulic elements, and enhance the protection effect of the high-pressure filter 14 on the hydraulic elements. The bypass valve 144 is disposed in the housing 141, and is connected to an oil inlet and an oil outlet of the filter oil passage 143, respectively, as a spare oil passage. When the filter element 142 is blocked, hydraulic oil cannot flow through the filter element, and at the moment, the bypass valve 144 is communicated, so that the oil inlet and the oil outlet of the filter oil passage 143 are communicated, the hydraulic oil normally flows through the bypass valve 144, and the normal operation of the hydraulic system 1 of the tarpaulin mechanism is not required to be interrupted. And the filter element 142 is replaced after the operation is finished, so that the time can be saved, and the efficiency can be improved.

The brake assembly 15 is used to brake the hydraulic motor 12 to stabilize the tarpaulin mechanism 24. Specifically, the brake assembly 15 includes a spring return cylinder 151 and a shuttle valve 152. The spring return oil cylinder 151 is connected to the hydraulic motor 12, and a piston rod 1511 of the spring return oil cylinder 151 is provided with a brake disc 1513 which is arranged corresponding to the rotating shaft of the hydraulic motor 12; in the initial state, the brake pads 1513 are in contact with the rotating shaft of the hydraulic motor 12, and the hydraulic motor 12 is held stationary by frictional force, thereby braking the hydraulic motor 12. A return spring 1514 is arranged in a rodless cavity of the spring return oil cylinder 151, two ends of the return spring 1514 are respectively connected with a piston rod 1511 and a cylinder 1512, and the piston rod 1511 extends out under the elastic force action of the return spring 1514, so that a brake piece 1513 is in contact with a rotating shaft of the hydraulic motor 12, and braking is realized. Shuttle valve 152 includes two oil inlets and one oil outlet; two oil inlets of the shuttle valve 152 are respectively connected into two pipelines connected with the hydraulic motor 12 through pipelines, and an oil outlet of the shuttle valve 152 is connected to a rod cavity of the spring return oil cylinder 151 through a pipeline.

When the hydraulic motor 12 is not supplied with oil, the pressures in the two lines connecting the hydraulic motor 12 are the same, and the oil inlet of the shuttle valve 152 is in a closed state. When the oil pump 112 supplies hydraulic oil to the hydraulic motor 12, a pressure difference is generated between two oil inlets of the shuttle valve 152, and the oil inlet of the shuttle valve 152 on the side with a larger pressure is connected, at this time, the hydraulic oil flows into the rod chamber of the spring return cylinder 151 through the shuttle valve 152, the drive piston rod 1511 contracts in the cylinder 1512 to release the brake of the brake pad 1513 to the hydraulic motor 12, and at the same time, the hydraulic oil flows into the hydraulic motor 12, and the hydraulic motor 12 is driven to operate normally. The hydraulic motor 12 can be kept static in a non-working state through the brake assembly 15, and particularly, after the cargo box 22 of the dump truck 2 is lifted in the unloading process of the dump truck 2, the tarpaulin mechanism 24 can be kept stable under the action of the brake assembly 15, so that the hydraulic motor 12 can be effectively prevented from reversely rotating under the action of the gravity of the tarpaulin mechanism 24.

In another implementation manner of this embodiment, as shown in fig. 9, the reversing valve 131 and the overflow valve 132 may be disposed in the same valve body to form two valve groups, and the check valve 133 may be connected to the two valve groups through a pipeline.

The high pressure filter 14 in this embodiment is located the oil outlet end of the oil pump 112, can bear the operating pressure of the tarpaulin mechanism hydraulic system 1, and the filter accuracy is high, can filter fine particles of impurities to prevent the impurity mixed in the hydraulic oil from causing the tarpaulin mechanism hydraulic system 1 to block or jamming, can reduce the possibility of damage to the control valve group 13 and the hydraulic motor 12, and is favorable for prolonging the service life of the hydraulic component.

Example nine

In the present embodiment, a dump truck 2 is provided, as shown in fig. 1 and fig. 2, the dump truck 2 includes a truck body 21, a cargo box 22, a lifting mechanism 23, a tarpaulin mechanism 24, and the tarpaulin mechanism hydraulic system 1 in any of the above embodiments.

The cargo box 22 is provided on the vehicle body 21 to enable cargo transportation by traveling of the vehicle body 21; the cargo box 22 is rotatably connected with the vehicle body 21, and the lifting end of the lifting mechanism 23 is connected with the cargo box 22, so that the cargo box 22 is driven to rotate relative to the vehicle body 21 through the lifting mechanism 23, the cargo box 22 is lifted, and the unloading operation is performed. The top of the cargo box 22 is provided with a tarpaulin mechanism 24, and the tarpaulin mechanism 24 is movably connected with the cargo box 22, so that the top of the cargo box 22 is opened or the top of the cargo box 22 is closed by the movement of the tarpaulin mechanism 24 relative to the cargo box 22, so that the materials are prevented from being thrown outwards from the top of the cargo box 22 during the transportation process, and the environmental protection is facilitated.

The oil supply assembly 11 and the high-pressure filter 14 of the hydraulic system 1 of the tarpaulin mechanism are arranged on the vehicle body 21; the hydraulic motor 12 of the tarpaulin mechanism hydraulic system 1 is provided on the cargo box 22. The output of the hydraulic motor 12 is drivingly connected to the tarpaulin mechanism 24 for opening the top of the cargo box 22 or closing the top of the cargo box 22 by the hydraulic motor 12 driving the tarpaulin mechanism 24 to move relative to the cargo box 22.

Above combine the technical scheme of the figure in detail to explain according to the utility model discloses a according to some embodiments, accessible high pressure filter filters hydraulic pressure fluid, and filter fineness is high, can filter the impurity of tiny granule to prevent that the impurity of sneaking into in the hydraulic pressure fluid and lead to tarpaulin mechanism hydraulic system to appear blockking up or jamming phenomenon, can reduce the impaired possibility of valve unit and hydraulic motor simultaneously, be favorable to prolonging hydraulic component's life.

In embodiments in accordance with the present invention, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited 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 meanings of the above terms in the embodiments according to the present invention can be understood by those of ordinary skill in the art as the case may be.

In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or unit referred to must have a specific direction, be configured and operated in a specific orientation, and thus, should not be construed as limiting the technical aspects of the present application.

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 in accordance with 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 according to the present invention, and is not intended to limit the technical solution of the present invention, and it is obvious to those skilled in the art that various modifications and changes can be made in the technical solution of the present invention. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the technical scheme of the application shall be included in the protection scope of the application.

Claims

1. A tarpaulin mechanism hydraulic system (1), characterized by, includes:

an oil supply unit (11);

the output end of the hydraulic motor (12) is connected with a tarpaulin mechanism (24) of the dump truck (2) to drive the tarpaulin mechanism (24) to move;

the control valve group (13), the control valve group (13) is respectively connected with the oil supply assembly (11) and the hydraulic motor (12) through pipelines so as to control the oil flow direction of the hydraulic motor (12);

and the high-pressure filter (14) is arranged in a pipeline connected between the oil supply assembly (11) and the control valve group (13) and is used for filtering hydraulic oil.

2. Tarpaulin mechanism hydraulic system (1) according to claim 1, characterized in that the high pressure filter (14) comprises:

the oil filter comprises a shell (141), wherein a filter oil channel (143) is arranged in the shell (141);

the filter element (142) is detachably arranged in the filter oil passage (143) and is used for filtering the oil flowing through the filter oil passage (143);

the bypass valve (144) is arranged in the shell (141), and the bypass valve (144) is respectively connected with an oil inlet and an oil outlet of the filtering oil channel (143) so as to conduct the filtering oil channel (143) when the filter element (142) is blocked.

3. Tarpaulin mechanism hydraulic system (1) according to claim 2,

the filter element (142) has a filtration accuracy in the range of 10 μm to 20 μm.

4. Tarpaulin mechanism hydraulic system (1) according to any of the preceding claims 1 to 3, characterized in that the oil supply package (11) comprises:

an oil tank (111);

an oil inlet of the oil pump (112) is connected with the oil tank (111), and an oil outlet of the oil pump (112) is connected with the high-pressure filter (14).

5. Tarpaulin mechanism hydraulic system (1) according to claim 4, characterized in that the control valve group (13) comprises:

the hydraulic control system comprises a reversing valve (131), wherein two working oil ports of the reversing valve (131) are respectively connected with two oil ports of the hydraulic motor (12) through pipelines, an oil inlet of the reversing valve (131) is connected with the high-pressure filter (14) through a pipeline, an oil return port of the reversing valve (131) is connected with an oil tank (111) through a pipeline, and the reversing valve (131) is used for adjusting the flow direction of oil in the hydraulic motor (12).

6. Tarpaulin mechanism hydraulic system (1) according to claim 5, characterized in that the control valve group (13) further comprises:

an oil inlet of the overflow valve (132) is connected to a pipeline between the high-pressure filter (14) and an oil inlet of the reversing valve (131), an oil outlet of the overflow valve (132) is connected with the oil tank (111) through a pipeline, and the overflow valve (132) is conducted when the oil pressure reaches a pressure threshold value so as to realize overflow pressure relief.

7. Tarpaulin mechanism hydraulic system (1) according to claim 6, characterized in that the control valve group (13) further comprises:

the check valve (133) is arranged in a pipeline between the high-pressure filter (14) and an oil inlet of the reversing valve (131) so that oil can only flow to the reversing valve (131) from the high-pressure filter (14) in a one-way mode;

the reversing valve (131), the overflow valve (132) and the one-way valve (133) are arranged in the same valve body, or the reversing valve (131) and the overflow valve (132) are arranged in the same valve body.

8. Tarpaulin mechanism hydraulic system (1) according to claim 7, characterized by further comprising:

a brake assembly (15) connected to the hydraulic motor (12) for braking the hydraulic motor (12).

9. Tarpaulin mechanism hydraulic system (1) according to claim 8, characterized in that the brake assembly (15) comprises:

the spring reset oil cylinder (151) is connected to the hydraulic motor (12), a piston rod (1511) of the spring reset oil cylinder (151) is arranged corresponding to the hydraulic motor (12), a brake block (1513) is arranged on the piston rod (1511) and used for braking the hydraulic motor (12), a reset spring (1514) is arranged in a rodless cavity of the spring reset oil cylinder (151), and two ends of the reset spring (1514) are respectively connected with the piston rod (1511) and a cylinder barrel (1512) of the spring reset oil cylinder (151) so as to drive the piston rod (1511) to extend out;

two oil inlets of the shuttle valve (152) are respectively connected into two pipelines connected with the hydraulic motor (12) through pipelines, and an oil outlet of the shuttle valve (152) is communicated with a rod cavity of the spring reset oil cylinder (151) through a pipeline.

10. A dump truck (2), characterized by comprising:

a vehicle body (21);

the cargo box (22) is arranged on the vehicle body (21), and the cargo box (22) is rotatably connected with the vehicle body (21);

the lifting mechanism (23) is arranged on the vehicle body (21), and the lifting end of the lifting mechanism (23) is connected with the cargo box (22) so as to drive the cargo box (22) to rotate relative to the vehicle body (21) and realize the lifting of the cargo box (22);

the tarpaulin mechanism (24) is arranged at the top of the container (22), the tarpaulin mechanism (24) is movably connected with the container (22), and the tarpaulin mechanism (24) realizes opening or closing of the container (22) through movement relative to the container (22);

the tarpaulin mechanism hydraulic system (1) of any one of claims 1 to 9, wherein an oil supply unit (11) and a high pressure filter (14) of the tarpaulin mechanism hydraulic system (1) are provided on the vehicle body (21), wherein a hydraulic motor (12) of the tarpaulin mechanism hydraulic system (1) is provided on the cargo box (22), and wherein an output of the hydraulic motor (12) is in driving connection with the tarpaulin mechanism (24) for driving the tarpaulin mechanism (24) to move relative to the cargo box (22).