CN211474554U - Hydraulic control system and dump truck - Google Patents
Hydraulic control system and dump truck Download PDFInfo
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- CN211474554U CN211474554U CN202020005714.2U CN202020005714U CN211474554U CN 211474554 U CN211474554 U CN 211474554U CN 202020005714 U CN202020005714 U CN 202020005714U CN 211474554 U CN211474554 U CN 211474554U
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Abstract
The utility model provides a hydraulic control system and tipper of sealed lid of tipper. The hydraulic control system includes: an oil tank; an oil pump; the reversing valve comprises an oil inlet, an oil return port and two working oil ports, the oil inlet of the reversing valve is connected with the oil outlet of the oil pump, and the oil return port is connected with the oil tank; each oil inlet of the bidirectional hydraulic lock is correspondingly connected with a working oil port of one reversing valve; the hydraulic oil cylinders are connected with the sealing covers to drive the sealing covers to open or close the container of the dumper; the first oil outlet of the bidirectional hydraulic lock is connected with rod cavities of the hydraulic cylinders, and the second oil outlet of the bidirectional hydraulic lock is connected with rodless cavities of the hydraulic cylinders. The utility model provides a hydraulic control system is equipped with a plurality of hydraulic cylinder, and through setting up two-way hydraulic lock of matched with and switching-over valve, hydraulic cylinder can realize at the optional position auto-lock to can make each hydraulic cylinder's action keep synchronous.
Description
Technical Field
The utility model relates to an engineering machine tool technical field particularly, relates to a hydraulic control system of sealed lid of tipper and tipper including above-mentioned hydraulic control system.
Background
At present, dump trucks such as urban transport muck trucks and the like are generally provided with a container sealing device such as tarpaulin or metal cover on a container, and the sealing device is used for preventing the muck truck from raising dust and leaking and throwing along to cause secondary pollution and damage to urban environment. The opening and closing actions of a metal cover of the existing dumper are realized by the expansion and contraction of a hydraulic oil cylinder, and the expansion and contraction of the hydraulic oil cylinder are controlled by adopting a multi-way valve and a balance valve. The hydraulic control mode makes the system complex and has many faults. If a simple hydraulic control circuit without a balance valve circuit is adopted, the problems of shaking of the oil cylinder action, asynchronization of the oil cylinder and the like can occur.
SUMMERY OF THE UTILITY MODEL
In order to improve at least one of the above technical problems, an object of the present invention is to provide a hydraulic control system for a sealing cover of a dump truck.
Another object of the utility model is to provide a tipper including above-mentioned hydraulic control system.
In order to achieve the above object, the utility model discloses technical scheme of the first aspect provides a hydraulic control system of sealed lid of tipper, include: an oil tank; an oil inlet of the oil pump is connected with the oil tank; the reversing valve comprises an oil inlet, an oil return port and two working oil ports, the oil inlet of the reversing valve is connected with the oil outlet of the oil pump, and the oil return port of the reversing valve is connected with the oil tank; the two oil inlets of the bidirectional hydraulic lock are respectively connected with the two working oil ports of the reversing valve, so that each oil inlet of the bidirectional hydraulic lock is correspondingly connected with one working oil port of the reversing valve; the hydraulic oil cylinders are connected with the sealing covers to drive the sealing covers to open or close the container of the dumper; the bidirectional hydraulic lock comprises a first oil outlet and a second oil outlet, the first oil outlet is connected with rod cavities of the hydraulic oil cylinders, and the second oil outlet is connected with rodless cavities of the hydraulic oil cylinders.
The hydraulic control system of the sealing cover of the dumper comprises an oil tank, an oil pump, a reversing valve, a bidirectional hydraulic lock and a hydraulic oil cylinder which are sequentially connected. The oil pump is connected with an oil inlet of the reversing valve, and two working oil ports of the reversing valve are respectively connected with a rod cavity and a rodless cavity of the hydraulic oil cylinder so as to control a piston rod of the hydraulic oil cylinder to reciprocate, so that the sealing cover is driven to act to open or close a container of the dump truck. Compared with the prior art, the hydraulic control system provided by the scheme is additionally provided with the two-way hydraulic lock between the reversing valve and the hydraulic oil cylinder, two oil inlets of the two-way hydraulic lock are respectively connected with two working oil ports of the reversing valve in a one-to-one correspondence manner, and two oil outlets of the two-way hydraulic lock are respectively connected with a rod cavity and a rodless cavity of the hydraulic oil cylinder. Like this, when no oil passes through in the switching-over valve, no oil passes through in the two-way hydraulic lock, and hydraulic cylinder has the pole chamber and does not have the interior fluid of pole intracavity all to be locked for hydraulic cylinder's position locking can effectively reduce the possibility that hydraulic cylinder action trembled, improves hydraulic cylinder's stability in use. Meanwhile, a balance valve is omitted, and the possibility of failure is reduced.
In addition, the number of the hydraulic oil cylinders is multiple, the bidirectional hydraulic lock comprises a first oil outlet and a second oil outlet, the first oil outlet is connected with the rod cavity of each hydraulic oil cylinder, and the second oil outlet is connected with the rodless cavity of each hydraulic oil cylinder. It can be understood that when one of the working oil ports of the reversing valve is opened, the rod cavities of the hydraulic oil cylinders are communicated with the working oil port, and oil enters the rod cavities of the hydraulic oil cylinders simultaneously, or when the other working oil port of the reversing valve is opened, the rodless cavities of the hydraulic oil cylinders are communicated with the working oil port, and the oil enters the rodless cavities of the hydraulic oil cylinders simultaneously. Meanwhile, the reversing valve is matched with the two-way hydraulic lock, when two working oil ports of the reversing valve are closed, two oil ways of the two-way hydraulic lock are closed simultaneously, a piston rod of the hydraulic oil cylinder can be prevented from extending out under the action of gravity or retracting after the piston rod is stressed, and therefore locking of the hydraulic oil cylinder is achieved, the hydraulic oil cylinder can be self-locked at any position, the possibility of shaking of actions of the hydraulic oil cylinders is effectively reduced, the actions of the hydraulic oil cylinders are kept synchronous, and the stability of actions of the sealing cover is guaranteed.
The hydraulic control system that this scheme provided compares in adopting synchronous motor, or through the scheme of a plurality of hydraulic cylinder synchronization actions of program control, and the cost is lower, and installation and repacking are more convenient through setting up two-way hydraulic pressure lock, consequently have higher use value, convenient to popularize and apply.
Additionally, the utility model provides an among the above-mentioned technical scheme hydraulic control system can also have following additional technical characteristics:
in the technical scheme, the number of the hydraulic oil cylinders is two, and the two hydraulic oil cylinders are respectively a first oil cylinder and a second oil cylinder which are used for being oppositely arranged at two ends of the sealing cover; the first oil outlet is connected with the rod cavity of the first oil cylinder and the rod cavity of the second oil cylinder, and the second oil outlet is connected with the rodless cavity of the first oil cylinder and the rodless cavity of the second oil cylinder.
Through setting up two hydraulic cylinder to make two hydraulic cylinder establish the both ends of sealed lid separately, the sealed lid is rectangular platelike structure usually, and two hydraulic cylinder both can set up respectively in the both ends of sealed lid along its length direction, also can be along the both ends of its width direction, in order to support sealed lid, and make sealed lid open closed in-process both ends balance, can improve the stationarity that sealed lid used.
In any of the above technical solutions, the direction valve is a three-position four-way electromagnetic direction valve.
In the technical scheme, a pipe joint with a damping hole is arranged at an oil inlet and an oil return port of the three-position four-way electromagnetic directional valve; and/or a damper is arranged between the first oil outlet and the rod cavity, and a damper is arranged between the second oil outlet and the rodless cavity.
In any of the above technical solutions, the hydraulic control system further includes a high pressure filter, disposed between an oil inlet of the directional valve and an oil outlet of the oil pump, for filtering impurities in the oil; and/or the one-way valve is arranged between the oil inlet of the reversing valve and the oil outlet of the oil pump and used for limiting oil to flow back to the oil pump.
In any of the above technical solutions, the oil pump is a fixed displacement pump; an overflow branch is arranged between the reversing valve and the oil pump, an overflow valve is arranged on the overflow branch, and an oil outlet of the overflow valve is connected with the oil tank.
The utility model discloses technical scheme of second aspect provides a tipper, include: the vehicle body is provided with a cargo box; a sealing cover; a link mechanism; and the hydraulic control system according to any one of the technical schemes of the first aspect, wherein one end of a hydraulic oil cylinder of the hydraulic control system is connected with the container, and the other end of the hydraulic oil cylinder is connected with the sealing cover through a link mechanism so as to drive the sealing cover to open or close the container.
The utility model discloses the tipper that technical scheme of second aspect provided, because of including any in the first aspect technical scheme hydraulic control system, therefore have all beneficial effects that any above-mentioned technical scheme had, no longer describe herein.
In the technical scheme, at least part of the hydraulic oil cylinder is sleeved with a sheath.
In the technical scheme, one end of the sheath is fixedly connected with the piston rod of the hydraulic oil cylinder, and the other end of the sheath is in sliding connection with the cylinder barrel of the hydraulic oil cylinder, so that when the piston rod extends out and retracts relative to the cylinder barrel, the sheath can always protect the extending part of the piston rod relative to the cylinder barrel.
In any of the above technical solutions, the sealing cover includes a plurality of cover plates, and the cover plates are connected with the hydraulic control system; when the container is in a closed state, the end surfaces of the cover plates are on the same plane, when the container is in an open state, the cover plates are stacked, and at least part of each cover plate is positioned on the outer side of the container.
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 is a schematic connection diagram of a hydraulic control system according to an embodiment of the present invention;
fig. 2 is a schematic connection diagram of a hydraulic control system according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a dump truck according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a hydraulic cylinder and a sheath according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a dump truck according to another embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a connection between a hydraulic control system and a hydraulic actuator according to an embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 6 is:
10 oil tank; 20 an oil pump; 30 a diverter valve; 40, bidirectional hydraulic lock; 50 hydraulic oil cylinders; 51 a first cylinder; 52 a second cylinder; 501 a piston rod; 502 a cylinder barrel; 510 a sheath; 60 a damper; 70 high pressure filter; 80 a one-way valve; a 90 relief valve; 100 vehicle bodies; a 110 cargo box; 200 sealing covers; 210 a cover plate; 300 hydraulic control system; 320 tail gate hydraulic locking system; 340 container lifting hydraulic control system; 400 linkage.
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.
The hydraulic control system and the dump truck in some embodiments of the present invention are described below with reference to fig. 1 to 6.
Some embodiments of the present application provide a hydraulic control system 300 comprising a tank 10, an oil pump 20, a directional valve 30, a bi-directional hydraulic lock 40, and a plurality of hydraulic rams 50.
As shown in fig. 1, an oil inlet of an oil pump 20 is connected to an oil tank 10, a reversing valve 30 includes an oil inlet, an oil return port and two working oil ports, an oil outlet of the oil pump 20 is connected to an oil inlet of the reversing valve 30, the oil return port of the reversing valve 30 is connected to the oil tank 10, the two working oil ports of the reversing valve 30 are respectively connected to two oil inlets of a bidirectional hydraulic lock 40 in a one-to-one correspondence manner, the two oil outlets of the bidirectional hydraulic lock 40 are respectively connected to a rod cavity of a hydraulic cylinder 50 and a rodless cavity of the hydraulic cylinder 50, the hydraulic cylinder 50 is connected to a sealing cover 200 of a dump truck, and a piston rod 501 of the hydraulic cylinder 50 is controlled to reciprocate by entering oil into the rod cavity or the rodless cavity, so.
The hydraulic control system 300 provided by the embodiment is provided with a plurality of hydraulic oil cylinders 50, and is matched with the reversing valve 30 by arranging the two-way hydraulic lock 40, when the valve core of the reversing valve 30 is in the middle position, two oil inlets of the two-way hydraulic lock 40 do not have oil to enter, and the oil cannot reversely flow out, so that the oil in the rod cavity and the rod-free cavity of each hydraulic oil cylinder 50 cannot flow back, thereby realizing the self-locking of each hydraulic oil cylinder 50 at any position and effectively reducing the possibility of the shaking of the action of each hydraulic oil cylinder 50. It can be understood that when oil enters one of the oil inlets of the two-way hydraulic lock 40, the other oil inlet reversely discharges oil, and the rodless cavities of the hydraulic cylinders 50 are communicated with each other and the rod cavities are communicated with each other, so that the extension and retraction of the piston rods of the hydraulic cylinders 50 are synchronous, and thus the actions of the hydraulic cylinders 50 are kept synchronous, and the stability of the action of the sealing cover 200 is ensured.
In some embodiments, as shown in fig. 2, the number of hydraulic rams 50 is two, being a first ram 51 and a second ram 52.
The first oil cylinder 51 and the second oil cylinder 52 are respectively arranged at two ends of the sealing cover 200, so that the two oil cylinders are matched to support the sealing cover 200 at two positions, and the movement of the sealing cover 200 is more stable.
The two hydraulic cylinders 50 may be respectively disposed at both ends of the seal cap 200 in the length direction thereof, or at both ends thereof in the width direction thereof, so that the dump truck may discharge the material to the rear side of the vehicle body 100, or to both sides of the vehicle body 100.
In some embodiments, as shown in FIG. 2, a damper 60 is disposed between the first outlet port and the rodless chamber, and a damper 60 is disposed between the second outlet port and the rodless chamber.
Through setting up attenuator 60, adjust the flow of fluid, reduce the influence of flow fluctuation to hydraulic cylinder 50, reduce hydraulic cylinder 50 shake or the flexible possibility. In addition, by adjusting the flow rate of the oil in the extended state and the retracted state of the hydraulic cylinder 50, the extending and retracting speeds of the first cylinder 51 and the second cylinder 52 are equalized, so that the movement of the first cylinder 51 and the second cylinder 52 is kept synchronized.
In some embodiments, as shown in FIG. 2, the directional valve 30 is a three-position, four-way solenoid directional valve.
The three-position four-way electromagnetic directional valve has a middle position, when the valve core of the directional valve 30 is in the middle position, the oil inlet is connected with the oil return port, and the oil returns to the oil tank 10, so that the pressure applied to the hydraulic oil cylinder 50 from the outside does not affect the two-way hydraulic lock 40, the use stability of the two-way hydraulic lock 40 is improved, and the possibility of shaking of the hydraulic oil cylinder 50 is reduced.
It is understood that the directional control valve 30 may be a four-position, four-way electromagnetic directional control valve, a three-position, five-way electromagnetic directional control valve, or the like having a middle position and an oil return port.
In some embodiments, as shown in fig. 2, the oil inlet and the oil return port of the three-position four-way electromagnetic directional valve are provided with pipe joints with damping holes.
The damping hole can be used for increasing the damping (power) in the oil circuit that circulates, through the coupling that sets up the band stop damping hole, can make the abrupt change of fluid gently get off through the damping hole to improve switching-over valve 30's stability, and reduce the impact of fluid to switching-over valve 30, play the effect of protection switching-over valve 30.
In some embodiments, as shown in fig. 2, a high pressure filter 70 is further disposed between the oil inlet of the direction valve 30 and the oil outlet of the oil pump 20.
Through setting up high pressure filter 70, can be the same as the fluid filtration in hydraulic control system 300 to the impurity in the filtering fluid, thereby make hydraulic control system 300 normal operating, improve hydraulic control system 300's stability in use and security.
In some embodiments, as shown in fig. 2, a check valve 80 is further provided between the oil inlet of the direction valve 30 and the oil outlet of the oil pump 20.
By providing the check valve 80, the oil can be prevented from flowing back, and the safety of the oil pump 20 can be improved.
In some embodiments, as shown in FIG. 2, the oil pump 20 is a fixed displacement pump; an overflow branch is arranged between the reversing valve 30 and the oil pump 20, an overflow valve 90 is arranged on the overflow branch, and an oil outlet of the overflow valve 90 is connected with the oil tank 10.
By providing the constant displacement pump, the flow rate of the oil can be controlled better, so that the hydraulic cylinder 50 can be extended or shortened by a predetermined stroke. Meanwhile, when the oil pump 20 is a constant delivery pump, the excess oil can be returned to the oil tank 10 by arranging the overflow branch and the overflow valve 90 on the overflow branch, so that the outlet pressure of the constant delivery pump is constant, the effect of protecting the constant delivery pump is achieved, the use reliability of the constant delivery pump is improved, and the service life of the constant delivery pump is prolonged.
Some embodiments of the present application provide a dump truck including a body 100, a seal cover 200, a linkage 400, and a hydraulic control system 300.
As shown in fig. 3, the vehicle body 100 is provided with a cargo box 110, a sealing cover 200 is closed over the cargo box 110, and both ends of the link mechanism 400 are connected to the cargo box 110 and the sealing cover 200, respectively.
One end of the hydraulic oil cylinder 50 of the hydraulic control system 300 is connected with the cargo box 110, the other end of the hydraulic oil cylinder 50 is rotatably connected with the link mechanism 400, and the link mechanism 400 moves through the extension and contraction of the hydraulic oil cylinder 50, so that the sealing cover 200 is driven to act to open or close the cargo box 110.
The dump truck provided in this embodiment includes the hydraulic control system 300 in any of the above embodiments, so that all the beneficial effects of any of the above embodiments are achieved, and no further description is given here.
Wherein, the dump truck can be a muck truck, a garbage truck, a dump truck and the like.
In other embodiments, the hydraulic cylinder 50 of the hydraulic control system 300 is connected to the cargo box 110 and the vehicle body 100, the cargo box 110 is provided with an opening, the sealing cover 200 is covered on the opening, the sealing cover 200 is rotatably connected with the cargo box 110 and can open or close the opening, the hydraulic cylinder 50 is used for rotating the cargo box 110 relative to the vehicle body 100 to enable the opening to face the ground level, so that the sealing cover 200 rotates under the action of gravity to open or close the cargo box 110.
In some embodiments, as shown in FIG. 3, a sheath 510 is positioned over at least a portion of hydraulic ram 50.
Through setting up sheath 510, can make sheath 510 provide certain guard action to hydraulic cylinder 50, improve hydraulic cylinder 50's reliability in service and stability in use. In the case that the hydraulic cylinder 50 is arranged in the cargo box 110, the arrangement of the sheath 510 can reduce the possibility that the material in the cargo box 110 interferes with the piston rod 501 in the process of extending and retracting the hydraulic cylinder 50, so that the hydraulic cylinder 50 can extend and retract more smoothly. In the case that the hydraulic cylinder 50 is arranged outside the cargo box 110, the risk that the piston rod 501 is damaged by foreign matters can be reduced by arranging the sheath 510, and a certain protection effect is provided for the hydraulic cylinder 50.
Further, as shown in fig. 4, one end of the sheath 510 is fixedly connected to the piston rod 501 of the hydraulic cylinder 50, and the other end of the sheath 510 is slidably connected to the cylinder 502 of the hydraulic cylinder 50, so that the sheath 510 can always protect the overhanging portion of the piston rod 501 relative to the cylinder 502 when the piston rod 501 extends and retracts relative to the cylinder 502.
The sheath 510 is used for being sleeved on the cylinder barrel 502 and is connected with the cylinder barrel 502 in a sliding mode, so that the sheath 510 can move along with the extension and contraction of the piston rod 501 of the hydraulic oil cylinder 50, and the possibility that the piston rod 501 is damaged by foreign matters or deformed due to external force impact is reduced.
In some embodiments, the seal cap 200 includes a plurality of cover plates 210, the cover plates 210 being coupled to the hydraulic control system 300; when the container 110 is in a closed state, the end surfaces of the plurality of flaps 210 are on the same plane, and when the container is in an open state, the flaps 210 are stacked in the up-down direction, and at least a portion of each flap 210 is located outside the area corresponding to the opening of the container 110.
For some dump trucks with larger containers 110, the sealing covers 200 can be formed by splicing a plurality of cover plates 210, so that the occupied space of the sealing covers 200 after opening is reduced, the exposed area of the openings of the containers can be larger, and the loading and unloading of goods are more convenient. As shown in fig. 5, the number of the cover plates 210 is two, and the two cover plates 210 are connected to the two hydraulic cylinders 50 in the hydraulic control system 300 through the link mechanism 400. The link mechanism 400 is actuated by the telescopic action of the hydraulic cylinder 50, so that the two flaps 210 are moved to open the cargo box 110. Through setting up hydraulic control system 300 that this application provided can make two hydraulic cylinder 50 synchronous motion for the motion of polylith apron 210 is more steady, reduces the possibility that the apron 210 shakes or blocks in the motion process, and then improves stability and the reliability of using.
In some embodiments, as shown in fig. 3 and 5, the linkage 400 is pivotally connected at each end to the cargo box 110 and the seal cap 200; the linkage 400 is pivotally connected to the hydraulic ram 50 of the hydraulic control system 300.
The link mechanism 400 may be a single link or may be formed by assembling a plurality of links. In the case where the link mechanism 400 includes two links, the two links are hinged to each other, the non-hinged ends of the two links are rotatably connected to the container 110 and the sealing cap 200, respectively, and the hydraulic cylinder 50 is hinged to the hinge shafts of the two links, so that the two links are driven to rotate with each other by the extension and contraction of the hydraulic cylinder 50, thereby opening or closing the opening of the sealing cap 200. Thus, for some containers 110 with larger volume, the larger cylinders are not needed, and the transmission is performed through the link mechanism 400, so that the cost can be saved. In the case that the sealing cover 200 includes a plurality of cover plates 210, as shown in fig. 5, the linkage mechanism 400 includes a plurality of links, and the hydraulic cylinder 50 can drive the plurality of cover plates 210 to move independently to open or close the cargo box 110 by properly setting the connection relationship between the plurality of links.
In some embodiments, as shown in fig. 6, some of the devices in the hydraulic control system 300 may also be shared with other hydraulic actuators on the dump truck, such as the tailgate hydraulic locking system 320, the container lift hydraulic control system 340, and the like.
By providing the tailgate hydraulic locking system 320 in communication with the hydraulic control system 300, secure tailgate locking may be ensured. Specifically, a clamping part is arranged on the tail door of the dump truck, an oil cylinder for limiting is arranged on the tail door frame corresponding to the clamping part, when the door needs to be locked, a cylinder rod of the oil cylinder moves to be attached to the clamping part, the oil cylinder is locked through the hydraulic control system 300, so that the oil cylinder and the clamping part are in a locking state, the cylinder rod directly abuts against the clamping part at the moment, the motion of the tail door is limited, and the tail door is prevented from being opened by mistake. Therefore, the locking device can be effectively clamped and locked by the clamping component and the oil cylinder, the effect is remarkable, the structure is simple, and the manufacturing cost is low.
It can also be understood that a container lifting hydraulic control system 340 connected with the hydraulic control system 300 is provided, the container lifting hydraulic control system 340 comprises a manual control valve, a hydraulic reversing valve, a limit valve and a container cylinder, an oil outlet of the hydraulic reversing valve is connected with an oil inlet of the container cylinder, an oil return port of the hydraulic reversing valve is connected with an oil tank, an air inlet of the manual control valve is connected with an air storage tank through an air pipe, a lifting air port of the manual control valve is connected with an air inlet of the limit valve through an air pipe, an air outlet of the limit valve is connected with a lifting air port of the hydraulic reversing valve through an air pipe, a descending air port vent pipe of the manual control valve is connected with a descending air port of the hydraulic reversing valve, and the hydraulic control system 300 and the container lifting hydraulic control system 340 share a power source (. The oil can be supplied to the container oil cylinder by controlling the manual operation valve to lift the container, the sealing cover is not required to be opened in the lifting process of the container, the container is not lifted when the sealing cover is opened, and the lifting of the container and the opening and closing of the sealing cover can be independently operated and are not interfered with each other. Therefore, the volume of the oil tank of the dump truck can be correspondingly reduced, the design is simple, and the lifting of the cargo box and the opening and closing of the sealing cover can be well controlled.
The hydraulic control system 300 and the dump truck provided by the present application are specifically described below with a specific embodiment.
At present, the urban conveying muck truck and the dump truck are generally provided with a sealing device such as tarpaulin or a sealing cover on a container 110, and the sealing device is used for preventing the muck truck from flying dust and leakage along the way and throwing the dust to cause secondary pollution and damage to the urban environment.
The opening and closing actions of the sealing cover 200 (usually a metal cover) of the dumper on the market are realized by the expansion and contraction of the hydraulic oil cylinder 50, and the expansion and contraction of the hydraulic oil cylinder 50 are controlled by adopting a multi-way valve and a balance valve. The hydraulic control mode makes the system complex and has many faults. If a simple hydraulic control circuit without a balance valve circuit is adopted, the problems of shaking of the oil cylinder action, asynchronization of the oil cylinder and the like can occur. Secondly, the working condition of the hydraulic cylinder 50 is extremely bad, and a piston rod 501 of the hydraulic cylinder 50 is easily damaged by the falling muck above the container 110 and needs to be protected by a sheath 510.
To this end, the present application provides a dump truck with a hard top cover, which is provided with a hard top cover (seal cover 200), and a hydraulic control system 300 for driving the seal cover 200.
The bidirectional hydraulic lock 40 is overlapped with the electromagnetic directional valve, so that the self-locking of the oil cylinder is ensured. The pipe joint with the damping hole is arranged at the oil inlet and the oil return port of the valve block, so that the oil cylinder can be prevented from shaking, and the problem of desynchrony of flow solving is limited. In addition, a special metal sheath is provided for the hydraulic cylinder 50 of the sealing cover 200 to prevent the cylinder piston rod 501 from being damaged.
Specifically, the hydraulic control system 300 of the hard-top dumper consists of an oil tank 10, an oil pump 20, a high-pressure filter 70, a one-way valve 80, an overflow valve 90, a three-position four-way reversing valve, a hydraulic lock (such as a two-way hydraulic lock 40), a damper 60 and an oil cylinder. The check valve 80, the overflow valve 90, the three-position four-way reversing valve and the hydraulic lock form an integrated valve block, and the damper 60 is a straight-through pipe joint with a damping hole inside.
The hard top cover dump truck comprises a chassis, a cargo box 110, a hard top cover, a connecting rod and the like, and when the hydraulic control system 300 works, the expansion of the oil cylinder can drive the connecting rod to rotate so as to drive the hard top cover to open and close. The hard top cap may be a one-piece top cap that covers the cargo box 110 or may be a split top cap consisting of two small top caps. The connecting rod can be a connecting rod or a rod system consisting of a plurality of connecting rods. The sheath 510 is a metal sheath, the metal sheath is used for being sleeved on the oil cylinder, the earrings (rotating shafts) of the metal sheath and the oil cylinder can move along with the extension and retraction of the piston rod 501 of the oil cylinder, one end of the piston rod 501 is connected with the rotating shaft of the metal sheath, the other end of the piston rod 501 reciprocates in the cylinder barrel 502, and therefore the metal sheath and the cylinder barrel 502 can protect the piston rod 501 and can prevent the piston rod 501 from being damaged by external foreign matters.
When the oil pump 20 is in operation, the hydraulic oil (i.e. oil liquid) stored in the oil tank 10 outputs high-pressure oil under the action of the oil pump 20, the high-pressure oil passes through the high-pressure filter 70 and then flows to the check valve 80, and when the left and right electromagnetic coils of the electromagnetic three-position four-way reversing valve are not powered, the hydraulic oil flows back to the oil tank 10.
When the left electromagnetic coil of the three-position four-way reversing valve is electrified, the oil cylinder extends out to drive the hard top cover above the dump truck container 110 to be opened, and meanwhile, the metal sheath also extends out along with the oil cylinder to protect a piston rod 501 of the oil cylinder;
when the right electromagnetic coil of the three-position four-way reversing valve is electrified, the oil cylinder retracts to drive the hard top cover above the container 110 of the dump truck to close, and meanwhile, the metal sheath also retracts together with the oil cylinder.
When the left and right electromagnetic coils of the electromagnetic three-position four-way reversing valve are not powered, hydraulic oil of the hydraulic control system 300 can directly return to the oil tank 10, no pressure exists in the system, and the two one-way valves 80 of the hydraulic lock are not opened, so that hydraulic oil in a rod cavity and a rodless cavity of the oil cylinder is locked at the moment, and the position of the oil cylinder is locked.
When the oil cylinder acts, the oil return path has a certain back pressure due to the action of the damper 60, and the shaking phenomenon of the hard top cover is avoided.
When the load driven by the oil cylinder is large, the system pressure is increased, and when the system pressure reaches the set pressure of the overflow valve 90, the valve core of the overflow valve 90 is opened to overflow, so that the system pressure is prevented from exceeding the set pressure of the overflow valve 90, and further, all elements are protected from being damaged due to overhigh pressure.
In summary, the hydraulic control system 300 and the dump truck provided in this embodiment have at least the following advantages: the hydraulic oil cylinder can be self-locked at any position; the two hydraulic oil cylinders on the left side and the right side of the metal cover do not shake during working, the speed is constant, and the two hydraulic oil cylinders are kept synchronous; the piston rod 501 of the hydraulic cylinder is protected by a sheath, reducing the possibility of damage.
In the present application, 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 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 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 indicated must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention.
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 description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by 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 (10)
1. The utility model provides a hydraulic control system of sealed lid of tipper which characterized in that includes:
an oil tank;
an oil inlet of the oil pump is connected with the oil tank;
the reversing valve comprises an oil inlet, an oil return port and two working oil ports, the oil inlet of the reversing valve is connected with the oil outlet of the oil pump, and the oil return port of the reversing valve is connected with the oil tank;
the two oil inlets of the bidirectional hydraulic lock are respectively connected with the two working oil ports of the reversing valve, so that each oil inlet of the bidirectional hydraulic lock is correspondingly connected with one working oil port of the reversing valve;
the hydraulic oil cylinders are connected with the sealing covers to drive the sealing covers to open or close the container of the dumper;
the bidirectional hydraulic lock comprises a first oil outlet and a second oil outlet, the first oil outlet is connected with rod cavities of the hydraulic oil cylinders, and the second oil outlet is connected with rodless cavities of the hydraulic oil cylinders.
2. The hydraulic control system of claim 1,
the hydraulic oil cylinder comprises a sealing cover, a first oil cylinder, a second oil cylinder and a hydraulic oil cylinder, wherein the sealing cover is arranged at the two ends of the sealing cover;
the first oil outlet is connected with the rod cavity of the first oil cylinder and the rod cavity of the second oil cylinder, and the second oil outlet is connected with the rodless cavity of the first oil cylinder and the rodless cavity of the second oil cylinder.
3. The hydraulic control system according to claim 1 or 2,
the reversing valve is a three-position four-way electromagnetic reversing valve.
4. The hydraulic control system of claim 3,
a pipe joint with a damping hole is arranged at an oil inlet and an oil return port of the three-position four-way electromagnetic directional valve; and/or
A damper is arranged between the first oil outlet and the rod cavity, and a damper is arranged between the second oil outlet and the rodless cavity.
5. The hydraulic control system according to claim 1 or 2, characterized by further comprising:
the high-pressure filter is arranged between an oil inlet of the reversing valve and an oil outlet of the oil pump and is used for filtering impurities in oil; and/or
And the check valve is arranged between the oil inlet of the reversing valve and the oil outlet of the oil pump and used for limiting oil to flow back to the oil pump.
6. The hydraulic control system according to claim 1 or 2,
the oil pump is a fixed displacement pump;
an overflow branch is arranged between the reversing valve and the oil pump, an overflow valve is arranged on the overflow branch, and an oil outlet of the overflow valve is connected with the oil tank.
7. A dump truck, comprising:
the vehicle body is provided with a cargo box;
a sealing cover;
a link mechanism;
and the hydraulic control system as claimed in any one of claims 1 to 6, wherein one end of a hydraulic cylinder of the hydraulic control system is connected with the cargo box, and the other end of the hydraulic cylinder is connected with the sealing cover through a link mechanism so as to drive the sealing cover to open or close the cargo box.
8. The dump truck according to claim 7,
at least part of the hydraulic oil cylinder is sleeved with a sheath.
9. The dump truck according to claim 8,
one end of the sheath is fixedly connected with a piston rod of the hydraulic oil cylinder, and the other end of the sheath is in sliding connection with a cylinder barrel of the hydraulic oil cylinder, so that when the piston rod extends and retracts relative to the cylinder barrel, the sheath can always protect the extending part of the piston rod relative to the cylinder barrel.
10. The dump truck according to any one of claims 7 to 9,
the sealing cover comprises a plurality of cover plates, and the cover plates are connected with the hydraulic control system;
when the container is in a closed state, the end surfaces of the cover plates are on the same plane, when the container is in an open state, the cover plates are stacked, and at least part of each cover plate is positioned on the outer side of the container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020005714.2U CN211474554U (en) | 2020-01-03 | 2020-01-03 | Hydraulic control system and dump truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020005714.2U CN211474554U (en) | 2020-01-03 | 2020-01-03 | Hydraulic control system and dump truck |
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| CN211474554U true CN211474554U (en) | 2020-09-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112706684A (en) * | 2020-12-29 | 2021-04-27 | 三一专用汽车有限责任公司 | Vehicle and control method of vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112706684A (en) * | 2020-12-29 | 2021-04-27 | 三一专用汽车有限责任公司 | Vehicle and control method of vehicle |
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