CN211076047U - Supporting multi-functional steering gear assembly of fork installation - Google Patents
Supporting multi-functional steering gear assembly of fork installation Download PDFInfo
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- CN211076047U CN211076047U CN201922218828.5U CN201922218828U CN211076047U CN 211076047 U CN211076047 U CN 211076047U CN 201922218828 U CN201922218828 U CN 201922218828U CN 211076047 U CN211076047 U CN 211076047U
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- steering gear
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Abstract
The utility model discloses a supporting multi-functional steering gear assembly of fork installation, the oil inlet of priority valve is connected to the oil-out of hydraulic pump, the oil-out of priority valve passes through the CF oil circuit and passes meso position choke C0 and be connected to and turn to the pneumatic cylinder, be connected to oil return pipeline through the EF oil circuit, through L S oil circuit and load sensing steering gear intercommunication, one side of choke C0 is provided with and becomes choke C1, be provided with the overflow valve on the oil return pipeline connecting line of priority valve with, turn to the overflow valve other end and communicate to the oil return oil filter through the oil return pipe, the oil return of steering gear is connected to the oil return oil filter through the oil return pipe, choke C2 and the CF oil circuit that the one end of priority valve set up are connected, the utility model discloses can not only satisfy the multiple mode needs that turn to of flexible arm fork truck, can also make flexible arm fork truck under different operating modes, furthest reduces energy loss, reduces the oil.
Description
Technical Field
The utility model relates to a steering gear technical field, specific supporting multi-functional steering gear assembly of fork installation that says so.
Background
The telescopic arm forklift is a loading and unloading machine which organically combines the telescopic arm structure of an automobile crane with the loading and unloading functions of a traditional forklift. The length of the telescopic arm can be changed to reach the required operation height and distance, and the limitation of the structural form of the traditional forklift is solved. The multifunctional fork loader can realize multiple purposes, is attached with multiple quick-change devices, and realizes operations of fork loading, lifting and the like. The device has the advantages of large working distance, high working height, capability of loading and unloading goods by crossing obstacles, wide visual field, better working safety performance and the like. The design of the telescopic arm forklift steering system directly influences the operation performance of the telescopic arm forklift steering system. The basic requirements of the steering system are that the operation is light and flexible, the work is stable and reliable, the use is economical and durable, the steering performance is an important factor for ensuring the safe driving of the machine, reducing the labor intensity of drivers and improving the operation productivity, and therefore, the steering system becomes an important aspect for evaluating the driving performance of the wheel type engineering machine.
SUMMERY OF THE UTILITY MODEL
The utility model aims at not enough to prior art, the utility model aims at providing a supporting multi-functional steering gear assembly of fork installation, its simple structure can satisfy the multiple mode needs that turn to of flexible arm fork truck, and the light flexibility of operation can also make flexible arm fork truck under different work condition, and furthest reduces energy loss, reduces the oil temperature to make engine output and the required hydraulic system power of flexible arm fork truck rationally match, alleviate navigating mate's intensity of labour, the energy saving effectively.
The utility model provides a supporting multi-functional steering gear assembly of fork installation, it includes oil tank, hydraulic pump, steering hydraulic cylinder, priority valve, load sensing steering gear, the oil inlet of priority valve is connected to the oil-out of hydraulic pump, the first oil-out of priority valve passes through the CF oil circuit and passes meso position choke C0 and be connected to steering hydraulic cylinder, the second oil-out of priority valve is connected to the oil return pipeline through the EF oil circuit, the third oil-out of priority valve passes through L S oil circuit and load sensing steering gear intercommunication, one side of meso position choke C0 is provided with variable throttle mouth C1, be provided with the turn-around overflow valve on the oil return pipeline connecting pipe way of priority valve with turn to and be provided with the oil return overflow valve between overflow valve and the priority valve oil-out, the turn-around overflow valve other end communicates to the oil filter through oil return T pipe, the oil return of steering gear is connected to the oil filter through oil return T pipe, the one end of priority throttle valve sets up oil filter C2 is connected with the CF oil circuit, oil return, hydraulic.
The utility model has the advantages that:
1. the utility model can compensate the load change well; the steering loop and other loops are not affected with each other, the main flow is preferentially supplied to the steering loop, only a micro flow passes through the steering gear in the middle position, so that the power loss caused by excessive oil supply to the steering oil path is eliminated, the system efficiency is improved, the heat balance condition is improved, the pressure and the flow of the steering loop are kept preferential, the steering is reliable, and the redundant flow can be completely supplied to the EF oil path while the steering flow is preferentially ensured; the neutral pressure characteristic is not affected by displacement. The telescopic arm forklift can meet the requirements of three steering modes and has a good energy-saving effect.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
The reference numbers indicate 1-load sensing steering gear, 2-priority valve, 3-oil tank, 4-hydraulic pump, 5-steering hydraulic cylinder, 6-CF oil circuit, 7-throttle C0, 8-L S oil circuit, 9-variable throttle C1, 10-return oil circuit, 11-steering overflow valve, 12-return oil filter, 13-throttle C2, 14-return T pipe and 15-EF oil circuit.
Detailed Description
The invention will be further described with reference to specific examples, which are intended to be illustrative only and not to limit the scope of the invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents also fall within the scope of the appended claims.
Referring to fig. 1, the utility model discloses a structure schematic diagram, this structure supporting multi-functional steering gear assembly of fork installation, it includes oil tank 3, hydraulic pump 4, steering cylinder 5, priority valve 2, load sensing steering gear 1, the oil-out of hydraulic pump 4 is connected the oil inlet of priority valve 2, the first oil-out of priority valve 2 passes through CF oil circuit 6 and passes meso position choke C07 and is connected to steering cylinder 5, the second oil-out of priority valve 2 passes through EF oil circuit 15 and is connected to oil return pipeline 10, the third oil-out of priority valve 2 passes through L S oil circuit 8 and communicates with load sensing steering gear 1, one side of meso position choke C07 is provided with variable throttle mouth C19, priority valve 2 is provided with steering overflow valve 11 with oil return pipeline 10 connecting pipeline, be provided with oil return 12 between steering overflow valve 11 and the oil outlet of priority valve 2, the other end of steering overflow valve 11 communicates to oil filter 12 through oil return T pipe 14, the oil return of steering gear is connected to oil return oil filter 12 through oil return T pipe 14, the one end C213 that priority valve 2 set up is connected to CF oil return 6, hydraulic pump.
A fixed displacement pump, a YX L type priority valve 2 and a load sensing steering gear 1 form a static load sensing hydraulic steering system, the priority valve 2 is a fixed differential pressure reducing element, and no matter how the load pressure and the oil supply quantity of a hydraulic pump 4 change, the priority valve 2 can maintain the pressure difference between two ends of a variable throttling port C19 in the steering gear to be basically unchanged, and the flow supplied to the steering gear is always equal to the product of the rotating speed of a steering wheel and the displacement of the steering gear.
When the steering gear is in the middle position, if the engine is shut off, the hydraulic pump 4 does not supply oil, and the control spring of the priority valve 2 pushes the valve core to the right to connect the CF oil path 6. After the engine is started, the oil distributed to the CF line 6 by the priority valve 2 flows through a middle throttle C0 in the steering gear to generate a pressure drop. The pressure at both ends of C0 is transmitted to both ends of the spool of priority valve 2, and the hydraulic pressure generated thereby is balanced with the spring force and the hydraulic force, so that the spool is in a balanced position. Because the liquid resistance of the C0 is very large, the pressure difference enough to push the valve core of the priority valve 2 to move left can be generated as long as a very small flow passes through, the valve core is further pushed to move left, the large EF valve port is opened, the small CF valve port is closed, and the flow passing through the CF oil path 6 is very small. When the steering wheel is rotated, when the relative angular displacement generated between the valve core and the valve sleeve of the steering gear reaches a set value, the middle throttle port C0 is completely closed, the oil flows through the variable throttle port C19 of the steering gear to generate pressure drop, and the pressure at the two ends of the C1 is transmitted to the two ends of the valve core of the priority valve 2, so that the valve core is forced to find a new balance position. If the rotating speed of the steering wheel is increased, at the moment of change, the flow passing through the steering gear is smaller than the product of the rotating speed of the steering wheel and the displacement of the steering gear, the rotating speed of the valve sleeve driven by the metering device is lower than the rotating speed of the valve core driven by the steering wheel, and as a result, the angular displacement of the valve core relative to the valve sleeve is increased, and the opening degree of the variable throttle C19 is increased. At this time, only a larger flow rate is passed to generate a pressure difference before the rotation speed change across C1 to push the spool of priority valve 2 to the left. Therefore, the valve opening of the priority valve 2 that connects to the CF oil passage 6 increases as the steering wheel speed increases, and the amount of oil supplied from the priority valve 2 to the steering gear will be equal to the product of the steering wheel speed and the steering gear displacement.
When the steering cylinder 5 reaches the end of the stroke, if the steering wheel continues to be rotated, the oil cannot flow to the steering cylinder 5. At this point the load pressure rises rapidly and the pressure differential across the variable orifice C19 decreases rapidly. The valve opens when the steering circuit pressure exceeds the set value of the steering relief valve. The pressure drop generated by the pressure oil flowing through the throttle port C213 is transmitted to the two ends of the valve core of the priority valve 2, the valve core is pushed to move left, the valve port communicated with the CF oil path 6 is forced to be small, the valve port communicated with the EF oil path 15 is forced to be large, and the pressure of the steering oil path is reduced. When the steering is flamed out, the metering device plays a role of the hydraulic pump 4, the output pressure oil pushes the piston of the steering hydraulic cylinder 5, and the oil discharged from the oil return cavity of the hydraulic cylinder returns to the upstream of the variable throttle C19 through a one-way valve in the steering gear.
In a load sensing type steering system, the steering system and a working system can be supplied with oil or achieve system confluence by using the same hydraulic pump 4 through a priority valve 2, the load sensing type steering gear has an L S port connected to a L S port of the priority valve 2 or a load sensing hydraulic pump 4, so that a steering load pressure signal of the steering gear is transmitted to the priority valve 2 or the load sensing hydraulic pump 4 through an oil pipe to control the oil supply amount of the steering gear supplied by the system, when the load sensing type steering gear is in a neutral position, only oil less than 2L/min in the steering system directly flows back to an oil tank 3, a L S pipeline transmits a pressure signal from a dynamic throttling port inside the steering gear to the priority valve 2, and the set pressure of an overflow valve in the priority valve 2 is higher than the steering demand pressure by 2 MPa.
Claims (1)
1. A multifunctional steering gear assembly matched with a forklift loader is characterized by comprising an oil tank, a hydraulic pump, a steering hydraulic cylinder, a priority valve and a load sensing steering gear, wherein an oil outlet of the hydraulic pump is connected with an oil inlet of the priority valve, a first oil outlet of the priority valve is connected to the steering hydraulic cylinder through a CF oil path and penetrates through a middle position throttle opening C0, a second oil outlet of the priority valve is connected to an oil return line through an EF oil path, a third oil outlet of the priority valve is communicated with the load sensing steering gear through a L S oil path, a variable throttle opening C1 is arranged on one side of a middle position throttle opening C0, a steering overflow valve is arranged on a connecting line of the priority valve and an oil return line, an oil return filter is arranged between the steering overflow valve and the oil outlet of the priority valve, the other end of the steering overflow valve is communicated to oil return through an oil return T pipe, an oil return opening of the steering gear is connected to an oil filter through an oil return T pipe, a throttle opening C2 arranged at.
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CN201922218828.5U CN211076047U (en) | 2019-12-05 | 2019-12-05 | Supporting multi-functional steering gear assembly of fork installation |
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CN201922218828.5U CN211076047U (en) | 2019-12-05 | 2019-12-05 | Supporting multi-functional steering gear assembly of fork installation |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113335002A (en) * | 2021-08-05 | 2021-09-03 | 山东威猛工程机械有限公司 | Steering hydraulic system of highway and railway dual-purpose engineering machinery |
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2019
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113335002A (en) * | 2021-08-05 | 2021-09-03 | 山东威猛工程机械有限公司 | Steering hydraulic system of highway and railway dual-purpose engineering machinery |
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