CN212959326U - Hydraulic system and oil press with same - Google Patents
Hydraulic system and oil press with same Download PDFInfo
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- CN212959326U CN212959326U CN202021210718.0U CN202021210718U CN212959326U CN 212959326 U CN212959326 U CN 212959326U CN 202021210718 U CN202021210718 U CN 202021210718U CN 212959326 U CN212959326 U CN 212959326U
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Abstract
The utility model provides a hydraulic system and have its hydraulic press, hydraulic system has first oil pump, first electromagnetic overflow valve, second oil pump and second electromagnetic overflow valve. The first electromagnetic overflow valve is connected in parallel to control the first oil pump; the flow rate of the second oil pump is smaller than that of the first oil pump; the second electromagnetic overflow valve is connected in parallel to control a second oil pump; the hydraulic system has a fast low-pressure mode, a slow high-pressure mode and a medium-speed medium-pressure mode, and in the fast low-pressure mode, the first oil pump and the second oil pump work simultaneously; in a low-speed high-pressure mode, the first electromagnetic overflow valve works; in the medium-speed and medium-pressure mode, the second electromagnetic overflow valve works. The utility model discloses hydraulic system has a plurality of mode, especially has the intermediate speed middling pressure mode that can work under the middling pressure condition. Therefore, when the actual required pressure is in the range of 40-75% of the calibrated pressure (medium pressure) of the press during production, the medium-speed and medium-pressure mode can be selected, and the working efficiency and the energy efficiency of the oil press under the medium-pressure condition can be greatly improved.
Description
Technical Field
The utility model relates to a hydraulic system and have its hydraulic press, especially relate to a hydraulic system and have its hydraulic press with intermediate speed medium pressure mode of operation.
Background
The existing double-pump hydraulic system of a large-tonnage oil press (more than 80 tons) is supplied with oil by a large vane pump or a small vane pump or a plunger pump. The action travel specifically comprises the following steps: fast forward under light load, fast forward under load, pressure maintaining under load, and fast backward under light load. When the oil press stretches or shears a large workpiece, the required pressure is very high (high pressure), and when the oil press is under light load and fast forwards or backwards, the large oil pump and the small oil pump work simultaneously to fast forwards. When the workpiece is contacted, the working process and the load pressure maintaining are changed, the large oil pump is overflowed by the hydraulic system, and only the small oil pump is reserved for working at high pressure and small flow, so that the calibrated working pressure of the oil press is achieved. However, if the actually required load pressure is in the range of 40-75% of the calibrated working pressure (medium pressure) of the existing press, only a small oil pump is left during the loading of the press, so that the pressure interference is caused, the load advancing is slow, and the actual service time efficiency and the energy efficiency of the press are not high. That is, the hydraulic system of the existing large-tonnage hydraulic press (more than 80 tons) has only one mode for switching the large oil pump and the small oil pump, and can only switch between a fast low-pressure mode (the large oil pump and the small oil pump work simultaneously) and a slow high-pressure mode (only the small oil pump works).
SUMMERY OF THE UTILITY MODEL
To hydraulic pressure work efficiency low, the slow technical problem of speed under the above-mentioned middling pressure condition, the utility model provides a hydraulic system and have this hydraulic system's hydraulic press.
The hydraulic system comprises a first oil pump, a first electromagnetic overflow valve, a second oil pump and a second electromagnetic overflow valve; the first electromagnetic overflow valve controls the first oil pump in parallel; the flow rate of the second oil pump is smaller than that of the first oil pump; the second electromagnetic overflow valve is connected in parallel to control the second oil pump; the hydraulic system is provided with a quick low-pressure mode, a slow high-pressure mode and a medium-speed medium-pressure mode, and the first oil pump and the second oil pump work simultaneously in the quick low-pressure mode; in the low-speed high-pressure mode, the first electromagnetic overflow valve works; and in the medium-speed and medium-pressure mode, the second electromagnetic overflow valve works.
As an optional technical solution, the hydraulic system further includes a first check valve and a second check valve, which are correspondingly disposed on oil paths of the first oil pump and the second oil pump.
As an optional technical solution, the hydraulic system further includes a logic valve, a first electro-hydraulic directional valve and a second electro-hydraulic directional valve, the logic valve is disposed in front of the first one-way valve and the second one-way valve, and the first electro-hydraulic directional valve and the second electro-hydraulic directional valve are respectively and correspondingly disposed on an oil path of the first oil pump and an oil path of the second oil pump.
As an optional technical scheme, the external control oil pressures of the first electro-hydraulic directional valve and the second electro-hydraulic directional valve are compared by the logic valve to be used as pilot oil pressures.
As an optional technical scheme, the first electro-hydraulic directional valve and the second electro-hydraulic directional valve both adopt M-shaped valve cores.
As an optional technical solution, when the hydraulic system is in a standby state, the first electro-hydraulic directional valve and the second electro-hydraulic directional valve are both in a neutral position.
As an optional technical solution, the hydraulic system further includes a motor, a filter, and an oil tank, the filter is disposed in the oil tank, the motor is electrically connected to the first oil pump and the second oil pump, and oil in the oil tank enters the first oil pump and the second oil pump after passing through the filter.
As an optional technical solution, the hydraulic system further includes an integrated block, and the first electromagnetic overflow valve, the second electromagnetic overflow valve, the first electro-hydraulic directional valve, the second electro-hydraulic directional valve, the logic valve, the first check valve, and the second check valve are integrated in the integrated block.
As an optional technical solution, the hydraulic system further includes a visualization module, and the visualization module is configured to display a selection mode, where the visualization module is electrically connected to the first electromagnetic spill valve and the second electromagnetic spill valve.
The utility model also provides an oil press, oil press includes above-mentioned arbitrary hydraulic system.
Compared with the prior art, the utility model discloses hydraulic system has a plurality of mode, especially has the intermediate speed middling pressure mode that can work under the middling pressure condition. Therefore, when the actual required pressure is in the range of 40-75% of the calibrated pressure (medium pressure) of the press during production, the medium-speed and medium-pressure mode can be selected, and the working efficiency and the energy efficiency of the oil press under the medium-pressure condition can be greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of the hydraulic system of the present invention.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", 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 element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Fig. 1 is a schematic diagram of a hydraulic system according to an embodiment of the present invention. Referring to fig. 1, the hydraulic system includes a first oil pump 1, a first electromagnetic overflow valve 2, a second oil pump 3, a second electromagnetic overflow valve 4, a first check valve 5, a second check valve 6, a logic valve 7, a first electro-hydraulic directional valve 8, a second electro-hydraulic directional valve 9, a single-head valve 10, an oil tank 11, a filter 12, a motor 13, and a pressure gauge 14, where the filter 12 is disposed in the oil tank 11, the motor 13 is electrically connected to the first oil pump 1 and the second oil pump 3, and oil in the oil tank 11 passes through the filter 12 and then enters the first oil pump 1 and the second oil pump 3. The electric connection of the electric motor 13 to the first oil pump 1 and the second oil pump 3 is performed by a conductive wire such as an electric wire. As shown in fig. 1, first electromagnetic spill valve 2 controls first oil pump 1 in parallel, second electromagnetic spill valve 4 controls second oil pump 3 in parallel, and first electromagnetic spill valve 2 and second electromagnetic spill valve 4 function as a safety valve and a pressure relief valve, and respectively control whether first oil pump 1 and second oil pump 3 overflow or not, that is, respectively control whether first oil pump 1 and second oil pump 3 operate or not. In addition, in the present embodiment, it is defined that the flow rate of the second oil pump 3 is smaller than that of the first oil pump 1, that is, relatively speaking, the first oil pump 1 is a large oil pump, the second oil pump 3 is a small oil pump, and the two oil pumps have a difference in flow rate, and are not oil pumps of the same type in practical use.
The hydraulic system has three working modes, namely a fast low-pressure mode, a slow high-pressure mode and a medium-speed medium-pressure mode. In the fast low-pressure mode, the first oil pump 1 and the second oil pump 3 work simultaneously, namely the first electromagnetic overflow valve 2 and the second electromagnetic overflow valve 4 do not work; in a slow high-pressure mode, the first electromagnetic overflow valve 2 works to enable the first oil pump 1 to overflow, and in the mode, only the second oil pump 3 with small flow works; in the medium-speed and medium-pressure mode, second electromagnetic spill valve 4 operates so that second oil pump 3 overflows, and in this mode, only first oil pump 1 having a large flow rate operates.
Specifically, after the user has selected the mode according to work piece size and required pressure, in this embodiment, hydraulic system includes visual module, and visual module is for example the display element, and visual module is used for showing the mode of selection, and wherein, visual module passes through the electrically conductive wire material such as electric wire and connects first electromagnetic spill valve 2 and second electromagnetic spill valve 4. The selection mode displayed by the visualization module is that the first electromagnetic overflow valve 2 or the second electromagnetic overflow valve 4 is selected by clicking on the visualization module, so that one of the first electromagnetic overflow valve 2 or the second electromagnetic overflow valve 4 is conducted, and the operation is simple and reliable.
After entering the selection mode, the hydraulic system operates in the selected mode. For example, when fast forward (fast low-pressure mode) is performed, two oil pumps work simultaneously, and when slow high pressure is required, that is, when the fast forward is performed, the first electromagnetic overflow valve 2 connected in parallel with the first oil pump 1 (large oil pump) works, so that the first oil pump 1 (large oil pump) is depressurized, and the motor 13 only drives the second oil pump 3 (small oil pump) to work, thereby achieving the required pressure. When medium speed and medium pressure are needed, the second electromagnetic overflow valve 4 connected with the second oil pump 3 (small oil pump) in parallel works during working, and the motor 13 only drives the first oil pump 1 (large oil pump) to work to reach the needed pressure. Therefore, the medium-speed and medium-pressure mode of the hydraulic system can be increased only by adding the second electromagnetic overflow valve 4 and the logic valve 7 which are connected in parallel with the second oil pump 3, and when the actual required pressure is in the range of 40-75% of the calibrated pressure (medium pressure) of the press during production, the medium-speed and medium-pressure mode can be selected during loading, so that the working efficiency and the energy efficiency of the press under the medium-pressure condition can be greatly improved.
The following is a comprehensive description of the components of the hydraulic system and their operating principles. During operation, the hydraulic system drives the oil pumps (for example, the first oil pump 1 and the second oil pump 3) to rotate at a high speed by the motor 13, hydraulic oil enters the oil pumps from the oil tank 11 after being filtered by the filter 12, and enters the manifold block 100 from the oil pumps through the oil pipe, and the hydraulic oil enters the two check valves respectively (for example, the first check valve 5 and the second check valve 6 are correspondingly arranged on the oil paths of the first oil pump 1 and the second oil pump 3).
The logic valve 7 is arranged in front of the first check valve 5 and the second check valve 6, and the first electro-hydraulic directional valve 8 and the second electro-hydraulic directional valve 9 are respectively and correspondingly arranged on an oil path of the first oil pump 1 and an oil path of the second oil pump 3. In the embodiment, the external control oil pressures of the two electro-hydraulic directional valves are compared by the logic valve 7 before the one-way valve to be used as pilot oil pressures. When the oil press with the hydraulic system is in standby, the first electro-hydraulic directional valve 8 and the second electro-hydraulic directional valve 9 are in neutral positions, and because the first electro-hydraulic directional valve 8 and the second electro-hydraulic directional valve 9 adopt M-shaped valve cores, hydraulic oil flows back to the oil tank 11 under the condition of small pressure, the power loss of the motor 13 is small, and the heating of the hydraulic oil is also low.
In this embodiment, the first electromagnetic overflow valve 2, the second electromagnetic overflow valve 4, the first electro-hydraulic directional valve 8, the second electro-hydraulic directional valve 9, the logic valve 7, the first check valve 5, the second check valve 6, and other elements are all integrated in the integrated block 100. Therefore, the method is convenient in specific use.
To sum up, the utility model discloses hydraulic system has a plurality of mode, especially has the intermediate speed middling pressure mode that can work under the middling pressure condition. Therefore, when the actually required pressure is in the range of 40-75% of the calibrated pressure (medium pressure) of the oil press during production, the medium-speed and medium-pressure mode during load can be selected, and the working efficiency and the energy efficiency of the oil press under the medium-pressure condition can be greatly improved.
The present invention has been described in relation to the above embodiments, which are only examples for implementing the present invention. Furthermore, the technical features mentioned in the different embodiments of the present invention described above can be combined with each other as long as they do not conflict with each other. It should be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, all changes and modifications which do not depart from the spirit and scope of the present invention are deemed to fall within the scope of the present invention.
Claims (10)
1. A hydraulic system, comprising:
a first oil pump;
the first electromagnetic overflow valve controls the first oil pump in parallel;
a second oil pump having a flow rate less than a flow rate of the first oil pump; and
the second electromagnetic overflow valve controls the second oil pump in parallel;
the hydraulic system is provided with a quick low-pressure mode, a slow high-pressure mode and a medium-speed medium-pressure mode, and the first oil pump and the second oil pump work simultaneously in the quick low-pressure mode; in the low-speed high-pressure mode, the first electromagnetic overflow valve works; and in the medium-speed and medium-pressure mode, the second electromagnetic overflow valve works.
2. The hydraulic system as recited in claim 1 further comprising first and second check valves disposed in respective oil paths of the first and second oil pumps.
3. The hydraulic system of claim 2, further comprising a logic valve, a first electro-hydraulic directional valve and a second electro-hydraulic directional valve, wherein the logic valve is disposed in front of the first one-way valve and the second one-way valve, and the first electro-hydraulic directional valve and the second electro-hydraulic directional valve are respectively disposed on the oil path of the first oil pump and the oil path of the second oil pump, respectively.
4. The hydraulic system as recited in claim 3 wherein the externally controlled oil pressures of the first and second electro-hydraulic directional control valves are compared by the logic valve as a pilot oil pressure.
5. The hydraulic system of claim 3, wherein the first electro-hydraulic directional valve and the second electro-hydraulic directional valve each employ an M-spool.
6. The hydraulic system of claim 3, wherein the first electro-hydraulic directional valve and the second electro-hydraulic directional valve are both in a neutral position when the hydraulic system is in standby.
7. The hydraulic system as recited in claim 3 further comprising an electric motor, a filter and a tank, wherein the filter is disposed in the tank, the electric motor is electrically connected to the first oil pump and the second oil pump, and oil in the tank passes through the filter and enters the first oil pump and the second oil pump.
8. The hydraulic system as recited in claim 7 further comprising a manifold, the first electromagnetic spill valve, the second electromagnetic spill valve, the first electro-hydraulic directional valve, the second electro-hydraulic directional valve, the logic valve, the first check valve, and the second check valve being integrated into the manifold.
9. The hydraulic system of claim 1, further comprising a visualization module to display a selection mode, wherein the visualization module electrically connects the first electromagnetic spill valve and the second electromagnetic spill valve.
10. An oil press, characterized in that it has a hydraulic system according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021210718.0U CN212959326U (en) | 2020-06-28 | 2020-06-28 | Hydraulic system and oil press with same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021210718.0U CN212959326U (en) | 2020-06-28 | 2020-06-28 | Hydraulic system and oil press with same |
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| Publication Number | Publication Date |
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| CN212959326U true CN212959326U (en) | 2021-04-13 |
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| CN202021210718.0U Active CN212959326U (en) | 2020-06-28 | 2020-06-28 | Hydraulic system and oil press with same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114109973A (en) * | 2021-11-29 | 2022-03-01 | 贵州凯星液力传动机械有限公司 | Vehicle-mounted hydraulic control system |
-
2020
- 2020-06-28 CN CN202021210718.0U patent/CN212959326U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114109973A (en) * | 2021-11-29 | 2022-03-01 | 贵州凯星液力传动机械有限公司 | Vehicle-mounted hydraulic control system |
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