CN205277961U - Cut fork truck's lift hydraulic system - Google Patents
Cut fork truck's lift hydraulic system Download PDFInfo
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- CN205277961U CN205277961U CN201620012179.7U CN201620012179U CN205277961U CN 205277961 U CN205277961 U CN 205277961U CN 201620012179 U CN201620012179 U CN 201620012179U CN 205277961 U CN205277961 U CN 205277961U
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Abstract
The utility model discloses a cut fork truck's lift hydraulic system, including last hydro -cylinder oil circuit (2) and lower hydro -cylinder oil circuit (4), go up the last oil inlet (2 -4) of hydro -cylinder oil circuit (2) and lower oil inlet (4 -5) the intercommunication of lower hydro -cylinder oil circuit (4), lift hydraulic system in be equipped with a magenetic exchange valve (4 -1), this magenetic exchange valve (4 -1) connects under in hydro -cylinder oil circuit (4) to the no pole chamber of hydro -cylinder (3) is higher than the no pole chamber oil pressure of hydro -cylinder (3) down through the no pole chamber intercommunication of first check valve (4 -4) with last hydro -cylinder (1), the no pole chamber oil pressure of going up hydro -cylinder (1) down. More than adopting after the structure, go up hydro -cylinder oil circuit and magenetic exchange valve of hydro -cylinder oil circuit sharing down, has practiced thrift the cost, reduced the volume, be favorable to more narrow and small space usage cut fork truck's hydraulic lifting platform on to can realize the sequence action of two hydro -cylinders of a magenetic exchange valve control, the structure is simpler.
Description
Technical field
The utility model relates to the technical field of material conveyance equipment, is specifically the hydraulic system for lifting of a kind of scissor car.
Background technology
Hydraulic elevating platform is a kind of multi-functional overweight handling machinery equipment, it play rise from 1 meter to 30 meters not etc., its motivating force is hydraulic drive, is applicable to all types of industries enterprise and the production lines such as automobile, freight container, Making mold, wood working, chemical industry be filling. Hydraulic elevating platform can be divided into fixed hydraulic lifting gantry, fork hydraulic lifting platform, mobile hydraulic lifting platform, aluminum alloy type hydraulic elevating platform and step on vehicle bridge hydraulic elevating platform etc. Such as fork hydraulic lifting platform of the prior art, also known as scissor car, in its hydraulic system for lifting, it is typically provided with upper cylinder hydraulic circuit and lower oil cylinder hydraulic oil circuit, usual upper cylinder oil circuit is provided with the Hydraulic Elements such as safety valve, one-way throttle valve and solenoid operated directional valve, lower oil path in oil cylinder also can be provided with the Hydraulic Elements such as one-way throttle valve and solenoid operated directional valve. Wherein: safety valve, it serves the effect of overload protection; One-way throttle valve, then control rapid increase, steadily downslide effect that oil cylinder exports; And solenoid operated directional valve, then achieve the object of power-off self-locking. But, but there is following problem in the lifting system of fork hydraulic lifting platform of the prior art: owing to this body structure of fork hydraulic lifting platform is comparatively compact, the various Hydraulic Elements that upper cylinder hydraulic circuit and lower oil cylinder hydraulic oil circuit respectively carry, the volume of lifting system is made to become huge, it is unfavorable for the arrangement of hydraulic efficiency system on lifting gantry, increase the volume of lifting gantry, be so not suitable for being applied to the use of small space; Reducing specification and the volume of hydraulic part, each parameter of oil circuit that so lifting gantry needs just does not reach requirement.
Practical novel content
Technical problem to be solved in the utility model is, there is provided a kind of solenoid operated directional valve can with the commutation of the commutation of control upper cylinder oil circuit and lower oil path in oil cylinder, thus reduce the volume of hydraulic efficiency system, and ensure the hydraulic system for lifting of the scissor car of upper and lower oil cylinder order action.
For solving the problems of the technologies described above, the hydraulic system for lifting of the scissor car that the utility model provides, comprising the upper cylinder oil circuit that the rodless cavity with upper cylinder is connected and the lower oil path in oil cylinder being connected with the rodless cavity of lower oil cylinder, the oil-in of upper cylinder oil circuit is connected with the oil-in of lower oil path in oil cylinder; Described hydraulic system for lifting is provided with a solenoid operated directional valve, this solenoid operated directional valve is connected in lower oil path in oil cylinder, and the rodless cavity of lower oil cylinder is connected with the rodless cavity of upper cylinder by the first check valve, and the rodless cavity oil pressure of upper cylinder is higher than the rodless cavity oil pressure of lower oil cylinder.
Described solenoid operated directional valve is bi-bit bi-pass solenoid operated directional valve, is wherein provided with check valve in one, and the conducting direction in other is contrary with the conducting direction of check valve.
Described lower oil path in oil cylinder also comprises the first one-way throttle valve and the first safety valve; The oil-in of lower oil path in oil cylinder is connected with the oil-in of solenoid operated directional valve respectively and the oil-in of the first safety valve is connected, the oil outlet of solenoid operated directional valve is connected with the oil-in of the first one-way throttle valve, and the oil outlet of the first safety valve is connected with the oil outlet of the first one-way throttle valve and is connected with the rodless cavity of lower oil cylinder simultaneously.
Also being provided with pressure tap between the oil-in of the first described one-way throttle valve and the oil outlet of solenoid operated directional valve, pressure tap place is connected with pressure measurement sensor.
Described upper cylinder oil circuit comprises the 2nd check valve, the 2nd safety valve and the 2nd one-way throttle valve; The oil-in of upper cylinder oil circuit respectively oil-in with the 2nd check valve be connected and the oil-in of the 2nd safety valve is connected, the oil outlet of the 2nd check valve is connected with the oil-in of the 2nd one-way throttle valve, and the oil outlet of the 2nd one-way throttle valve is connected with the oil outlet of the 2nd safety valve and is connected with the rodless cavity of upper cylinder.
The oil-in of described the first check valve in lower oil path in oil cylinder is connected with the oil outlet of the 2nd check valve in upper cylinder oil circuit, and the oil outlet of the first check valve is connected with the rodless cavity of lower oil cylinder.
After adopting above structure, the utility model compared with prior art, has following advantage:
1) owing to upper cylinder oil circuit and lower oil path in oil cylinder share a solenoid operated directional valve, therefore, save in prior art the solenoid operated directional valve originally arranged in upper cylinder oil circuit on the one hand, saved cost; On the other hand, also reduce the volume of hydraulic system for lifting, advantageously on the hydraulic elevating platform of the scissor car used at small space;
2) in addition, the rodless cavity oil pressure of upper cylinder, higher than lower oil cylinder rodless cavity oil pressure, makes scissor car when rising, the first action of lower oil cylinder, to the action just starting upper cylinder at the end of lower oil cylinder stroke; And scissor car is when declining, the first action of upper cylinder, to the action just starting lower oil cylinder at the end of upper cylinder stroke; Thus realizing the order action that a solenoid operated directional valve controls two oil cylinders, structure is simpler.
Accompanying drawing explanation
Fig. 1 is the hydraulic schematic diagram of the hydraulic system for lifting of the utility model scissor car.
Wherein, 1, upper cylinder; 2, upper cylinder oil circuit; 2-1, the 2nd check valve; 2-2, the 2nd one-way throttle valve; 2-3, the 2nd safety valve; 2-4, upper oil-in; 3, lower oil cylinder; 4, lower oil path in oil cylinder; 4-1, solenoid operated directional valve; 4-2, the first one-way throttle valve; 4-3, the first safety valve; 4-4, the first check valve; 4-5, lower oil-in; 4-6, pressure tap; 4-7, pressure measurement sensor.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in more detail.
The hydraulic schematic diagram of the hydraulic system for lifting of the novel scissor car of the utility model shown in composition graphs 1 is known, it comprises the upper cylinder oil circuit 2 that the rodless cavity with upper cylinder 1 is connected and the lower oil path in oil cylinder 4 being connected with the rodless cavity of lower oil cylinder 3, and the upper oil-in 2-4 of upper cylinder oil circuit 2 is connected with the lower oil-in 4-5 of lower oil path in oil cylinder 4. Described hydraulic system for lifting is provided with a solenoid operated directional valve 4-1, this solenoid operated directional valve 4-1 is connected in lower oil path in oil cylinder 4, and the rodless cavity of lower oil cylinder 3 is connected with the rodless cavity of upper cylinder 1 by the first check valve 4-4, and the rodless cavity oil pressure of upper cylinder 1 is higher than the rodless cavity oil pressure of lower oil cylinder 3.
Described solenoid operated directional valve 4-1 is bi-bit bi-pass solenoid operated directional valve, is wherein provided with check valve in one, and the conducting direction in other is contrary with the conducting direction of check valve.
Described lower oil path in oil cylinder 4 also comprises the first one-way throttle valve 4-2 and the first safety valve 4-3. The lower oil-in 4-5 of lower oil path in oil cylinder 4 respectively oil-in with solenoid operated directional valve 4-1 be connected and the oil-in of the first safety valve 4-3 is connected, the oil outlet of solenoid operated directional valve 4-1 is connected with the oil-in of the first one-way throttle valve 4-2, and the oil outlet of the first safety valve 4-3 is connected with the oil outlet of the first one-way throttle valve 4-2 and is connected with the rodless cavity of lower oil cylinder 3 simultaneously.
Also being provided with pressure tap 4-6 between the oil-in of the first described one-way throttle valve 4-2 and the oil outlet of solenoid operated directional valve 4-1, pressure tap 4-6 place is connected with pressure measurement sensor 4-7.
Described upper cylinder oil circuit 2 comprises the 2nd check valve 2-1, the 2nd safety valve 2-3 and the 2nd one-way throttle valve 2-2. The upper oil-in 2-4 of upper cylinder oil circuit 2 respectively oil-in with the 2nd check valve 2-1 be connected and the oil-in of the 2nd safety valve 2-3 is connected, the oil outlet of the 2nd check valve 2-1 is connected with the oil-in of the 2nd one-way throttle valve 2-2, and the oil outlet of the 2nd one-way throttle valve 2-2 is connected with the oil outlet of the 2nd safety valve 2-3 and rodless cavity with upper cylinder 1 is connected.
The oil-in of the first check valve 4-4 in described lower oil path in oil cylinder 4 is connected with the oil outlet of the 2nd check valve 2-1 in upper cylinder oil circuit 2, and the oil outlet of the first check valve 4-4 is connected with the rodless cavity of lower oil cylinder 3.
Working process of the present utility model is as follows:
When scissor car rises, hydraulic efficiency oil enters oil from upper oil-in 2-4 and lower oil-in 4-5 place respectively, and now bi-bit bi-pass solenoid operated directional valve 4-1 is not energized, on being in one with check valve. In lower oil path in oil cylinder 4, hydraulic efficiency oil enters the rodless cavity of lower oil cylinder 3 through solenoid operated directional valve 4-1, the first one-way throttle valve 4-2. In upper cylinder oil circuit 2, hydraulic efficiency oil enters in the rodless cavity of upper cylinder 1 after the 2nd check valve 2-1, the 2nd one-way throttle valve 2-2. Owing to the rodless cavity oil pressure of upper cylinder 1 is higher than the rodless cavity oil pressure of lower oil cylinder 3, when not reaching the pressure of the piston promoting upper cylinder 1, fluid after the 2nd check valve 2-1 can open the first check valve 4-4 by oil circuit, enter the rodless cavity place of lower oil cylinder 3, therefore, lower oil cylinder 3 first action, promotes piston rod until lower oil cylinder 3 stroke is covered. Now, the oil pressure at the rodless cavity place of upper cylinder 1 is more and more higher, until when reaching the oil pressure promoting piston, hydraulic efficiency oil just promotes piston action.
When cutting descending of forklift, bi-bit bi-pass solenoid operated directional valve 4-1 is energized commutation, oil circuit guiding becomes oil return state, now, 2nd check valve 2-1 closes, the rodless cavity of upper cylinder 1 is owing to being be connected by the rodless cavity of the first check valve 4-4 with lower oil cylinder 3, therefore, the high-pressure oil at lower oil cylinder 3 rodless cavity place forces lower in-oil cylinder piston rod to keep self-locking state, by the time the hydraulic efficiency oil in upper cylinder 1 rodless cavity by the first check valve 4-4 is all, after first one-way throttle valve 4-2 and solenoid operated directional valve 4-1 after oil return, the pressure at lower oil cylinder 3 rodless cavity place reduces gradually, until lower than during with the impellent of lower in-oil cylinder piston rod, lower oil cylinder 3 beginning action.
The above; it it is only the better feasible exemplifying embodiment of the utility model; therefore interest field of the present utility model can not namely be limited to; concerning those of ordinary skill in the art, other various corresponding changes that all utilization the technical solution of the utility model and technical conceive are made all should belong within the protection domain of the utility model claim.
Claims (6)
1. the hydraulic system for lifting of a scissor car, comprising the upper cylinder oil circuit (2) that the rodless cavity with upper cylinder (1) is connected and the lower oil path in oil cylinder (4) being connected with the rodless cavity of lower oil cylinder (3), the upper oil-in (2-4) of upper cylinder oil circuit (2) is connected with the lower oil-in (4-5) of lower oil path in oil cylinder (4); It is characterized in that: described hydraulic system for lifting is provided with a solenoid operated directional valve (4-1), this solenoid operated directional valve (4-1) is connected in lower oil path in oil cylinder (4), and the rodless cavity of lower oil cylinder (3) is connected with the rodless cavity of upper cylinder (1) by the first check valve (4-4), and the rodless cavity oil pressure of upper cylinder (1) is higher than the rodless cavity oil pressure of lower oil cylinder (3).
2. the hydraulic system for lifting of scissor car according to claim 1, it is characterized in that: described solenoid operated directional valve (4-1) is bi-bit bi-pass solenoid operated directional valve, wherein being provided with check valve in one, the conducting direction in other is contrary with the conducting direction of check valve.
3. the hydraulic system for lifting of scissor car according to claim 2, it is characterised in that: described lower oil path in oil cylinder (4) also comprises the first one-way throttle valve (4-2) and the first safety valve (4-3); The lower oil-in (4-5) of lower oil path in oil cylinder (4) respectively oil-in with solenoid operated directional valve (4-1) be connected and the oil-in of the first safety valve (4-3) is connected, the oil outlet of solenoid operated directional valve (4-1) is connected with the oil-in of the first one-way throttle valve (4-2), and the oil outlet of the first safety valve (4-3) is connected with the oil outlet of the first one-way throttle valve (4-2) and is connected with the rodless cavity of lower oil cylinder (3) simultaneously.
4. the hydraulic system for lifting of scissor car according to claim 3, it is characterized in that: being also provided with pressure tap (4-6) between the oil-in of the first described one-way throttle valve (4-2) and the oil outlet of solenoid operated directional valve (4-1), pressure tap (4-6) place is connected with pressure measurement sensor (4-7).
5. the hydraulic system for lifting of scissor car according to claim 1, it is characterised in that: described upper cylinder oil circuit (2) comprises the 2nd check valve (2-1), the 2nd safety valve (2-3) and the 2nd one-way throttle valve (2-2); The upper oil-in (2-4) of upper cylinder oil circuit (2) respectively oil-in with the 2nd check valve (2-1) be connected and the oil-in of the 2nd safety valve (2-3) is connected, the oil outlet of the 2nd check valve (2-1) is connected with the oil-in of the 2nd one-way throttle valve (2-2), and the oil outlet of the 2nd one-way throttle valve (2-2) is connected with the oil outlet of the 2nd safety valve (2-3) and rodless cavity with upper cylinder (1) is connected.
6. the hydraulic system for lifting of scissor car according to claim 5, it is characterized in that: the oil-in of described the first check valve (4-4) in lower oil path in oil cylinder (4) is connected with the oil outlet of the 2nd check valve (2-1) in upper cylinder oil circuit (2), and the oil outlet of the first check valve (4-4) is connected with the rodless cavity of lower oil cylinder (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620012179.7U CN205277961U (en) | 2016-01-08 | 2016-01-08 | Cut fork truck's lift hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620012179.7U CN205277961U (en) | 2016-01-08 | 2016-01-08 | Cut fork truck's lift hydraulic system |
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| Publication Number | Publication Date |
|---|---|
| CN205277961U true CN205277961U (en) | 2016-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620012179.7U Active CN205277961U (en) | 2016-01-08 | 2016-01-08 | Cut fork truck's lift hydraulic system |
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| Country | Link |
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| CN (1) | CN205277961U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112456378A (en) * | 2020-11-10 | 2021-03-09 | 成都工业职业技术学院 | Pressure monitoring system of automobile lifter |
-
2016
- 2016-01-08 CN CN201620012179.7U patent/CN205277961U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112456378A (en) * | 2020-11-10 | 2021-03-09 | 成都工业职业技术学院 | Pressure monitoring system of automobile lifter |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 315151 Zhejiang Province, Ningbo city Haishu District Yin Jiang Zhen Guang Xi Cun Siming Road No. 103 Patentee after: Ningbo Zhongtian Haide Hydraulic Co., Ltd. Address before: 315151 Zhejiang city of Ningbo province Yinzhou District yin'gong Industrial Zone Town sunray Road No. 25 Patentee before: Ningbo Yinzhou Zhongtian Hydraulic Co., Ltd. |