CN103104005A - Small-sized loader hydraulic pilot control device - Google Patents

Small-sized loader hydraulic pilot control device Download PDF

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Publication number
CN103104005A
CN103104005A CN 201210547741 CN201210547741A CN103104005A CN 103104005 A CN103104005 A CN 103104005A CN 201210547741 CN201210547741 CN 201210547741 CN 201210547741 A CN201210547741 A CN 201210547741A CN 103104005 A CN103104005 A CN 103104005A
Authority
CN
China
Prior art keywords
valve
pilot
pilot control
delivery
oil
Prior art date
Application number
CN 201210547741
Other languages
Chinese (zh)
Inventor
付文君
傅稼浩
刘浩
Original Assignee
青岛鲁达工程机械制造有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 青岛鲁达工程机械制造有限公司 filed Critical 青岛鲁达工程机械制造有限公司
Priority to CN 201210547741 priority Critical patent/CN103104005A/en
Publication of CN103104005A publication Critical patent/CN103104005A/en

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Abstract

The invention discloses a small-sized loader hydraulic pilot control device which is placed between a working pump and a working cylinder. The small-sized loader hydraulic pilot control device mainly comprises a delivery valve, a two-position three-way valve and a pilot valve. An inlet of the delivery valve is connected with an oil outlet of the working pump. An outlet of the delivery valve is connected with the pilot valve through the two-position three-way valve. The delivery valve is composed of an overflow valve, a reducing valve and an energy accumulator. After being connected in parallel, the overflow valve and the reducing valve are connected on an inlet of the two-position three-way valve in series. The energy accumulator is connected on a parallel connection oil outlet line of the overflow valve and the reducing valve in series. Because a line is separated from a main oil line, and the delivery valve is placed on the main oil line in a series connection mode, after the pressure of oil is reduced, pilot control is achieved through the pilot valve. Because working, turning and pilot control is achieved through a single hydraulic pump and a pilot valve is left out, the small-sized loader hydraulic pilot control device is simple in structure and low in cost, and reduces power loss of an engine and energy consumption.

Description

Hydraulic pilot control device for minitype loader
Technical field
The present invention relates to a kind of loader hydraulic control system, particularly relate to a kind of hydraulic pilot control device for minitype loader.
Background technology
At present, guide's hydraulic control device on domestic loader, two control cranks are arranged, and each control crank relies on mechanical handling to control and completes, by lever and linkage, directly or by flexible axle pull the spool action by manpower, handle effort, comfortableness is poor, perhaps passes through hydraulic force increasing device, after power is amplified, pull the spool action by connecting rod.Chinese patent 200520072198 discloses a kind of hydraulic guiding controller for loader (as shown in Figure 1), and it comprises oil return filter 1 ', left steering cylinder 2 ', right steering cylinder 3 ', steering gear 4 ', distributing valve 5 ', tipping bucket cylinder 6 ', swing arm cylinder 7 ', 8 ', pilot control valve 9 ', pressure-gradient control valve 10 ', working barrel 11 ', pioneer pump 12 ', safety valve 13 ', oil return filter 14 ', fuel tank 15 '.This leading controller has a distributing valve 5 ', distributing valve 5 ' is connected with the tipping bucket cylinder with swing arm cylinder 7 ', 8 ' ' be connected, also be connected with steering gear 4 ', also filter 14 ' by oil return and be inserted into fuel tank 15 ', also be connected with pilot control valve 9 ', pilot control valve 9 ' is inserted in fuel tank 15 ' by pioneer pump 12 ' and oil return filter 14 '; Be connected with safety valve 13 ' on guide's control valve 9 ', pressure-gradient control valve 10 ' inserts in fuel tank 15 ' by working barrel 11 ' and oil return filter 14 '; Pressure-gradient control valve 10 ' also is connected with left and right steering cylinder 2 ', 3 ' with steering gear 4 '.This control device adopts the pressure double pump system, and a pump is used for work and turns to, and a pump is used for pilot control.After realizing engine misses by pressure selection valve, put down swing arm.If engine misses, distributing valve 5 ' can't be realized commutation, make each working cylinder to move, can cause swing arm to put down from eminence, or scraper bowl is supported in ground and can't regain.Because this hydraulic control pilot system device adopts an independent fuel feeding of hydraulic pump, cost is high, and line arrangement is loaded down with trivial details.
Summary of the invention
The object of the present invention is to provide a kind of hydraulic pilot control device for minitype loader of simple in structure, with low cost, reliable in action.
For achieving the above object, technical solution of the present invention is:
The present invention is a kind of hydraulic pilot control device for minitype loader, and it mainly is comprised of delivery valve, two position three-way valve, pilot valve, one way valve; The import of delivery valve connects the oil-out of working barrel, and the outlet of delivery valve is connected with pilot valve by two position three-way valve; Described delivery valve is comprised of overflow valve, reducing valve and accumulator, is serially connected in the entrance of two position three-way valve after overflow valve and reducing valve parallel connection, and accumulator is attempted by on overflow valve and reducing valve output circuit in parallel; Described one way valve is arranged on the input oil circuit of reducing valve.
After adopting such scheme, the present invention uses by tell one the tunnel on working connection, and serial connection one delivery valve is realized pilot control by pilot valve after the fluid decompression.Due to the present invention with single hydraulic pump realize work, turn to, pilot control, default one pilot valve, make structure of the present invention simpler, cost is cheaper, has reduced the engine power loss, has reduced the consumption of the energy, even after engine misses or working barrel break down, also can utilize the Oil-source control distributing valve swing arm in accumulator to put down by manually controlling pilot valve, or be recoverable to scraper bowl when scraper bowl is supported on the ground.
The present invention is further illustrated with concrete enforcement below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the structure chart of utility loader hydraulic pilot control device;
Fig. 2 is hydraulic circuit diagram of the present invention.
The specific embodiment
As shown in Figure 2, it is a kind of hydraulic circuit diagram of small sized loader hydraulic pressure, and it comprises steering gear 1, pressure-gradient control valve 2, working barrel 3, oil suction filter core 4, fuel tank 5, leading controller 6, distributing valve 7, oil return filter core 8, working cylinder 9, steering cylinder 10.
Described working barrel 3 oilers connect fuel tank 5 by oil suction filter core 4; Working barrel 3 oil-outs are leaded up to pressure-gradient control valve 2, steering gear 1 and are connected steering cylinder 10, working barrel 3 oil-outs another roads by leading controller 6, realize the commutation of distributing valve.
Described leading controller of the present invention 6 mainly is comprised of delivery valve 61, two position three-way valve 62, pilot valve 63 and one way valve 64.The import of delivery valve 61 connects the oil-out of working barrel 3, and the outlet of delivery valve 61 is connected with pilot valve 63 by two position three-way valve 62; Described delivery valve 61 is comprised of overflow valve 611, reducing valve 612, accumulator 613.Be serially connected in the entrance of two position three-way valve 62 after overflow valve 611 and reducing valve 612 parallel connections, accumulator 613 is attempted by on the output circuit in parallel of overflow valve 611 and reducing valve 612; One way valve 614 is arranged on the input oil circuit of reducing valve 612.
Operating principle of the present invention:
When the hydraulic system of loader is started working, can tell an oil circuit by working barrel 3, be communicated with oil suction filter core 4 and one way valve 614, hydraulic oil is stored in an oily part in accumulator 613 after oil suction filter core 4, one way valve 614, reducing valve 612, a part continues to flow to two position three-way valve 62, if the standard that oil pressure is set greater than overflow valve 611, oil can carry out release by overflow valve 611.When working barrel 3 normal operation, accumulator 613 mainly works the oil pressure effect of stablizing guide's oil circuit, in case engine misses or working barrel can't work, the hydraulic oil of the storage of accumulator 613 will flow to pilot valve 63, thereby realize pilot control, the distributing valve commutation is managed the position with swing arm and scraper bowl placement bout, be convenient to flight-line maintenance, guarantee personal security.
Emphasis of the present invention just is: tell one the tunnel on working connection, serial connection one delivery valve.

Claims (1)

1. hydraulic pilot control device for minitype loader, it is characterized in that: it mainly is comprised of delivery valve, two position three-way valve, pilot valve, one way valve; The import of delivery valve connects the oil-out of working barrel, and the outlet of delivery valve is connected with pilot valve by two position three-way valve; Described delivery valve is comprised of overflow valve, reducing valve and accumulator, is serially connected in the entrance of two position three-way valve after overflow valve and reducing valve parallel connection, and accumulator is attempted by on overflow valve and reducing valve output circuit in parallel; Described one way valve is arranged on the input oil circuit of reducing valve.
CN 201210547741 2012-12-07 2012-12-07 Small-sized loader hydraulic pilot control device CN103104005A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201210547741 CN103104005A (en) 2012-12-07 2012-12-07 Small-sized loader hydraulic pilot control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201210547741 CN103104005A (en) 2012-12-07 2012-12-07 Small-sized loader hydraulic pilot control device

Publications (1)

Publication Number Publication Date
CN103104005A true CN103104005A (en) 2013-05-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN 201210547741 CN103104005A (en) 2012-12-07 2012-12-07 Small-sized loader hydraulic pilot control device

Country Status (1)

Country Link
CN (1) CN103104005A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103410188A (en) * 2013-07-31 2013-11-27 烟台兴业机械股份有限公司 Hydraulic system, with load sensitive variable, for underground carry-scraper
CN105525641A (en) * 2016-01-25 2016-04-27 徐州徐工特种工程机械有限公司 Movable arm dropping hydraulic system used for skid steer loader in case of flameout
CN109281874A (en) * 2018-12-05 2019-01-29 恒天九五重工有限公司 A kind of the major loop Load Relief System and pile press machine of guide's hydraulic control
CN109695599A (en) * 2019-01-31 2019-04-30 广西柳工机械股份有限公司 Variable delivery hydraulic system, pump output flow control method, engineering machinery

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103410188A (en) * 2013-07-31 2013-11-27 烟台兴业机械股份有限公司 Hydraulic system, with load sensitive variable, for underground carry-scraper
CN105525641A (en) * 2016-01-25 2016-04-27 徐州徐工特种工程机械有限公司 Movable arm dropping hydraulic system used for skid steer loader in case of flameout
CN109281874A (en) * 2018-12-05 2019-01-29 恒天九五重工有限公司 A kind of the major loop Load Relief System and pile press machine of guide's hydraulic control
CN109695599A (en) * 2019-01-31 2019-04-30 广西柳工机械股份有限公司 Variable delivery hydraulic system, pump output flow control method, engineering machinery

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PB01 Publication
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WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20130515

C02 Deemed withdrawal of patent application after publication (patent law 2001)