CN213017030U - Electric control hydraulic device - Google Patents
Electric control hydraulic device Download PDFInfo
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- CN213017030U CN213017030U CN202021238574.XU CN202021238574U CN213017030U CN 213017030 U CN213017030 U CN 213017030U CN 202021238574 U CN202021238574 U CN 202021238574U CN 213017030 U CN213017030 U CN 213017030U
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- hydraulic pump
- reversing valve
- way reversing
- hydraulic
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Abstract
The utility model discloses an electric control hydraulic device, which comprises a hydraulic pump, a three-position four-way reversing valve and a hydraulic cylinder, wherein the hydraulic pump is connected with an oil inlet of the three-position four-way reversing valve; one working oil port of the three-position four-way reversing valve is connected with a rod cavity of the hydraulic cylinder, the other working oil port of the three-position four-way reversing valve is connected with a rodless cavity of the hydraulic cylinder, a piston rod of the hydraulic cylinder is provided with a displacement sensor, and the displacement sensor is connected with an electromagnetic coil of the three-position four-way reversing valve through an electric controller. The utility model discloses a device can the displacement precision of accurate control pneumatic cylinder.
Description
Technical Field
The utility model belongs to hydraulic system, concretely relates to automatically controlled hydraulic means.
Background
At present, most of hydraulic systems for controlling the displacement of hydraulic cylinders in the market are manually controlled, the manual hydraulic reversing valve system is widely used, the hydraulic cylinders are controlled to lift or fall in load carrying, the control performance is good, the cost of the whole system is not high, but the defect is that the precision control of the displacement of the hydraulic cylinders is difficult to control, even if the hydraulic cylinders are load-sensitive control systems, the hydraulic cylinders only can realize the characteristic of constant flow, namely the moving speed of the hydraulic cylinders is relatively accurate and stable, but the extension length of a rod cavity cannot be guaranteed. For practical use occasions, such as high-temperature operation environments, when molten iron or other molten liquid is controlled to be added in the pouring process, the hydraulic oil cylinder cannot accurately control the adding amount.
SUMMERY OF THE UTILITY MODEL
The purpose of the invention is as follows: an object of the utility model is to provide an automatically controlled hydraulic means that can accurate control pneumatic cylinder displacement precision.
The technical scheme is as follows: the utility model comprises a hydraulic pump, a three-position four-way reversing valve and a hydraulic cylinder, wherein the hydraulic pump is connected with an oil inlet of the three-position four-way reversing valve; one working oil port of the three-position four-way reversing valve is connected with a rod cavity of the hydraulic cylinder, the other working oil port of the three-position four-way reversing valve is connected with a rodless cavity of the hydraulic cylinder, a piston rod of the hydraulic cylinder is provided with a displacement sensor, and the displacement sensor is connected with an electromagnetic coil of the three-position four-way reversing valve through an electric controller.
An overflow valve is arranged between an oil inlet and an oil return port of the three-position four-way reversing valve, and when the external pressure is overlarge, pressure protection is performed through the overflow valve.
And a hydraulic lock is arranged between the three-position four-way reversing valve and the hydraulic cylinder and is used for maintaining the pressure of the system when the hydraulic cylinder stops moving.
The hydraulic pump comprises a large-flow hydraulic pump and a small-flow hydraulic pump, prime motors are adopted as power sources of the large-flow hydraulic pump and the small-flow hydraulic pump, the two hydraulic pumps can provide large flow when working simultaneously, and one of the hydraulic pumps can be controlled to work according to requirements.
And check valves are arranged between the high-flow hydraulic pump and the oil inlet of the three-position four-way reversing valve and between the low-flow hydraulic pump and the oil inlet of the three-position four-way reversing valve, so that backflow is prevented.
An unloading valve is arranged at an oil outlet of the high-flow hydraulic pump, and when the hydraulic pump runs in a load state, the high-flow hydraulic pump is unloaded through the unloading valve to protect the system.
A pressure gauge is arranged on a branch between the high-flow hydraulic pump and an oil inlet of the three-position four-way reversing valve, and the pressure of the branch where the high-flow hydraulic pump is located can be measured in real time.
The small-flow hydraulic pump is a one-way quantitative hydraulic pump.
Has the advantages that: compared with the prior art, the utility model, its beneficial effect lies in: (1) the displacement of the hydraulic cylinder can be accurately controlled; (2) an electric controller and a displacement sensor are adopted, so that the positioning error is small, and the speed and the pressure can be adjusted; (3) the casting mold can be used for casting products of the same series and different thicknesses, and can conveniently and quickly cast blanks of different thicknesses under the conditions of more varieties and small batch; if the large-batch production is carried out, the mould with the fixed thickness can be made; (4) the whole system can realize automation, can meet the requirements in a high-temperature casting workshop, and ensures the quality and the production efficiency of products.
Drawings
Fig. 1 is a schematic view of the structural principle of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and the accompanying drawings.
As shown in fig. 1, the utility model discloses a hydraulic pump, tribit four-way reversing valve 3, pneumatic cylinder 4, displacement sensor 5, electric controller 6, off-load valve 7, overflow valve 8, the hydraulic pump includes a large-traffic hydraulic pump 1 and a low discharge hydraulic pump 2, and in this embodiment, low discharge hydraulic pump 2 is one-way quantitative hydraulic pump. The power sources of the large-flow hydraulic pump 1 and the small-flow hydraulic pump 2 are both prime motors. The hydraulic pump is connected with an oil inlet of the three-position four-way reversing valve 3; check valves are arranged between the high-flow hydraulic pump 1 and an oil inlet of the three-position four-way reversing valve 3 and between the low-flow hydraulic pump 2 and an oil inlet of the three-position four-way reversing valve 3. An oil outlet of the large-flow hydraulic pump 1 is provided with an unloading valve 7, and when the large-flow hydraulic pump 1 operates in a load state, the large-flow hydraulic pump 1 is unloaded through the unloading valve 7. And a pressure gauge 10 is arranged on a branch between the high-flow hydraulic pump 1 and an oil inlet of the three-position four-way reversing valve 3. One working oil port of the three-position four-way reversing valve 3 is connected with a rod cavity of the hydraulic cylinder 4, the other working oil port of the three-position four-way reversing valve 3 is connected with a rodless cavity of the hydraulic cylinder 4, the hydraulic cylinder 4 is used as a hydraulic execution element, and the stroke displacement of a piston rod of the hydraulic cylinder is realized by controlling the flow of the three-position four-way reversing valve 3. The utility model discloses a tribit four-way reversing valve 3, have characteristics fast, that the precision is high of response, can control the exit flow of pneumatic cylinder 4 well. And the utility model discloses a tribit four-way reversing valve 3 can realize remote control, under some special environment, still can reference this hydraulic means. A piston rod of the hydraulic cylinder 4 is provided with a displacement sensor 5, and the displacement sensor 5 can calculate a lifting height value required by the piston rod. The displacement sensor 5 is connected with an electromagnetic coil of the three-position four-way reversing valve 3 through the electric controller 6, the actual displacement of the piston rod in the hydraulic cylinder 4 is fed back to the electric controller 6 by the displacement sensor 5, and the electric controller 6 inputs a displacement signal to the three-position four-way reversing valve 3 to form closed-loop control. An overflow valve 8 is arranged between the oil inlet and the oil return port of the three-position four-way reversing valve 3. A hydraulic lock is arranged between the three-position four-way reversing valve 3 and the hydraulic cylinder 4.
In an idle state, the large-flow hydraulic pump 1 and the small-flow hydraulic pump 2 supply oil to the hydraulic cylinder 4 at the same time to realize rapid movement, and the flow is large at the moment and can respond to an initial or end position rapidly; when the hydraulic pump operates in a load state, the system pressure is increased, the large-flow hydraulic pump 1 is unloaded through the unloading valve 7 in a high-pressure state, the small-flow hydraulic pump 2 independently provides pressure oil, and the flow is controlled by controlling the reversing of the three-position four-way reversing valve 3 and the opening amount of the inner valve core, so that the displacement of the hydraulic cylinder 4 is controlled; when the external pressure is too high, the pressure protection is carried out through the overflow valve 8. When the stroke of the hydraulic cylinder 4 needs to be contracted, the three-position four-way reversing valve 3 is switched to the right position, and at the moment, the pressure of a rod cavity of the hydraulic cylinder 4 is increased to push a piston rod of the hydraulic cylinder 4 to move leftwards; when the hydraulic cylinder 4 needs to stop moving, the three-position four-way reversing valve 3 is switched to a middle position, and pressure is maintained through a hydraulic lock; when the three-position four-way reversing valve 3 is switched to the left position, the pressure of a rodless cavity of the hydraulic cylinder 4 is increased, meanwhile, the flow of the three-position four-way reversing valve 3 is controlled, and when the hydraulic cylinder 4 reaches the displacement position, the three-position four-way reversing valve 3 is immediately switched to the middle position, so that the displacement precision of the three-position four-way reversing valve is ensured. The utility model discloses pneumatic cylinder 4's actual displacement can satisfy speed stability controllable and remove the assigned position, and just the sensitive control of load can realize the stability of speed, and has actually walked how long distance, need cooperate electropneumatic controller 6 to control in addition displacement sensor 5 feedback, just can guarantee the accurate position that the pneumatic cylinder displacement arrived.
Claims (8)
1. An electric control hydraulic device comprises a hydraulic pump, a three-position four-way reversing valve (3) and a hydraulic cylinder (4), wherein the hydraulic pump is connected with an oil inlet of the three-position four-way reversing valve (3); a working oil port of the three-position four-way reversing valve (3) is connected with a rod cavity of the hydraulic cylinder (4), and another working oil port of the three-position four-way reversing valve (3) is connected with a rodless cavity of the hydraulic cylinder (4), and the three-position four-way reversing valve is characterized in that: and a piston rod of the hydraulic cylinder (4) is provided with a displacement sensor (5), and the displacement sensor (5) is connected with an electromagnetic coil of the three-position four-way reversing valve (3) through an electric controller (6).
2. The electrically controlled hydraulic apparatus according to claim 1, characterized in that: an overflow valve (8) is arranged between an oil inlet and an oil return port of the three-position four-way reversing valve (3).
3. The electrically controlled hydraulic apparatus according to claim 1, characterized in that: and a hydraulic lock (9) is arranged between the three-position four-way reversing valve (3) and the hydraulic cylinder (4).
4. The electrically controlled hydraulic apparatus according to claim 1, characterized in that: the hydraulic pump comprises a large-flow hydraulic pump (1) and a small-flow hydraulic pump (2), and prime motors are adopted as power sources of the large-flow hydraulic pump (1) and the small-flow hydraulic pump (2).
5. The electrically controlled hydraulic apparatus according to claim 4, characterized in that: and check valves are arranged between the high-flow hydraulic pump (1) and an oil inlet of the three-position four-way reversing valve (3) and between the low-flow hydraulic pump (2) and an oil inlet of the three-position four-way reversing valve (3).
6. The electrically controlled hydraulic apparatus according to claim 4, characterized in that: an oil outlet of the high-flow hydraulic pump (1) is provided with an unloading valve (7), and when the hydraulic pump operates in a load state, the high-flow hydraulic pump (1) is unloaded through the unloading valve (7).
7. The electrically controlled hydraulic apparatus according to claim 4, characterized in that: and a pressure gauge (10) is arranged on a branch between the high-flow hydraulic pump (1) and an oil inlet of the three-position four-way reversing valve (3).
8. The electrically controlled hydraulic apparatus according to claim 4, characterized in that: the small-flow hydraulic pump (2) is a unidirectional quantitative hydraulic pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021238574.XU CN213017030U (en) | 2020-06-30 | 2020-06-30 | Electric control hydraulic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021238574.XU CN213017030U (en) | 2020-06-30 | 2020-06-30 | Electric control hydraulic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213017030U true CN213017030U (en) | 2021-04-20 |
Family
ID=75499939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021238574.XU Active CN213017030U (en) | 2020-06-30 | 2020-06-30 | Electric control hydraulic device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213017030U (en) |
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2020
- 2020-06-30 CN CN202021238574.XU patent/CN213017030U/en active Active
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