Energy-saving method for hydraulic station of machining center

Abstract

The invention discloses an energy-saving method for a machining center hydraulic station, and the machining center hydraulic station comprises an oil tank, a high-pressure filter, a permanent magnet motor, a plunger pump, an overflow valve, a backflow filter, a one-way valve, a pressure sensor, a surge tank, a reversing valve, an oil cylinder and a pipeline. The control module is used for controlling the permanent magnet motor to stop when the pressure reaches a set pressure value and starting the permanent magnet motor to convey an oil medium for pressurization when the pressure is lower than the set pressure value; in the prior art, an asynchronous motor is used for driving an oil pump all the time, and when pressure is insufficient, pressurization is conducted through a reversing valve and a one-way valve; when the pressure gauge displays that the pressure reaches the set pressure, the pressure flows into the oil tank through the overflow valve, and the force output by the motor is idle; compared with the prior art, a pressure gauge is replaced by the pressure sensor, the permanent magnet motor is controlled to stop when the pressure is reached, and the permanent magnet motor is started when the pressure is not enough, so that the utilization rate is greatly improved, and the energy-saving effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of energy-saving methods for hydraulic stations, and in particular to an energy-saving method for a hydraulic station of a machining center. Background Art

[0002] As an important hydraulic power system, hydraulic station is widely used in various engineering machinery, metallurgical equipment, ships, wind power generation equipment and other fields. However, the traditional hydraulic station uses asynchronous motor to drive the oil pump. When the pressure is not enough, the reversing valve and the one-way valve are used to increase the pressure. When the pressure reaches the set pressure, it flows into the oil tank through the overflow valve. The asynchronous motor keeps turning. When the oil is used, the asynchronous motor starts to work. In this way, the power output of the asynchronous motor is useless, and there are problems such as high energy consumption and poor energy-saving and environmental protection efficiency. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art mentioned in the background technology and to propose an energy-saving method for a hydraulic station of a machining center.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A method for energy saving of a hydraulic station of a machining center, the hydraulic station of the machining center comprising an oil tank, a high-pressure filter, a permanent magnet motor, a plunger pump, an overflow valve, a reflux filter, a one-way valve, a pressure sensor, a pressure-stabilizing tank, a reversing valve, an oil cylinder and a pipeline. The method for energy saving comprises: connecting the pressure sensor to the pipeline to control the permanent magnet motor to stop when the pressure reaches a set pressure value, and starting the permanent magnet motor to convey oil medium for pressurization when the pressure is lower than the set pressure value.

[0005] As a further feature of the method of the present invention, the pipeline includes an upper oil pipe, an oil return pipe, an overflow pipe and a branch oil pipe. The upper oil pipe and the oil return pipe are connected between the oil tank and the oil cylinder, the overflow pipe is connected between the upper oil pipe and the oil return pipe, and the branch oil pipe is connected to the upper oil pipe.

[0006] As a further feature of the method of the present invention, the pressure sensor is connected to the branch oil pipe, and the pressure stabilizing tank is connected to the upper oil pipe through the branch oil pipe.

[0007] As a further feature of the method of the present invention, the one-way valve is connected to the high-pressure filter in the upper oil pipe, the high-pressure filter is close to the oil tank, and the reflux filter is connected to the return oil pipe.

[0008] As a further feature of the method of the present invention, the reversing valve is connected to the upper oil pipe and the oil return pipe, and the reversing valve is close to the oil cylinder.

[0009] As a further feature of the method of the present invention, the plunger pump is connected to the upper oil pipe, and the permanent magnet motor is connected to the plunger pump.

[0010] As a further feature of the method of the present invention, the overflow valve is connected to the overflow pipe.

[0011] In the prior art, an asynchronous motor is used to drive the oil pump. When the pressure is insufficient, the pressure is increased through a reversing valve and a one-way valve. When the pressure gauge shows that the pressure reaches the set pressure, it flows into the oil tank through the overflow valve, and the power output by the motor is useless. Compared with the prior art, the present invention replaces the pressure gauge with a pressure sensor. When the pressure is reached, the permanent magnet motor is controlled to stop. When the pressure is insufficient, the permanent magnet motor is started. In this way, the permanent magnet motor does not need to do useless work, which greatly improves the utilization rate and energy saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A system diagram of a hydraulic station of a machining center in an energy-saving method of a hydraulic station of a machining center proposed by the present invention; Figure 2 The present invention provides a wiring diagram of a two-wire current output in an energy-saving method for a hydraulic station of a machining center.

[0013] In the figure: 1. Oil tank; 2. High-pressure filter; 3. Permanent magnet motor; 4. Plunger pump; 5. Overflow valve; 6. Reflux filter; 7. Check valve; 8. Pressure sensor; 9. Pressure regulating tank; 10. Reversing valve; 11. Oil cylinder. DETAILED DESCRIPTION

[0014] The content of the present invention can be more easily understood by selecting the following detailed description of the preferred implementation method of the present invention and the embodiments included. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those of ordinary skill in the art to which the present invention belongs. When there is a conflict, the definition in this specification shall prevail.

[0015] As used herein, the term "prepared from" is synonymous with "comprising." As used herein, the terms "comprising," "including," "having," "containing," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0016] The conjunction "consisting of excludes any unspecified element, step, or component. If used in a claim, this phrase renders the claim closed-ended so that it does not include materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of" appears in a clause of the body of a claim rather than immediately following the subject matter, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0017] When amount, concentration or other value or parameter is expressed as range, preferred range or a series of upper preferred value and lower preferred value limit range, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value and any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when disclosing range "1 to 5", described range should be interpreted as including range "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5" etc. When numerical range is described in this article, unless otherwise stated, the range is intended to include its end value and all integers and fractions within the range.

[0018] Singular forms include plural references unless the context clearly indicates otherwise. "Optional" or "either" means that the subsequently described event or incident may or may not occur, and that the description includes instances where the event occurs and instances where it does not.

[0019] Approximate terms in the specification and claims are used to modify quantities, indicating that the present invention is not limited to the specific quantity, but also includes acceptable and modified parts close to the quantity without causing changes in the relevant basic functions. Accordingly, the use of "about", "approximately", etc. to modify a numerical value means that the present invention is not limited to the exact numerical value. In some examples, the approximate terms may correspond to the accuracy of the instrument for measuring the numerical value. In the specification and claims of this application, range limitations can be combined and / or interchanged, and if not otherwise stated, these ranges include all subranges contained therein.

[0020] In addition, the indefinite articles "a" and "an" before the elements or components of the present invention have no restrictions on the quantity requirements (i.e. the number of occurrences) of the elements or components. Therefore, "a" or "an" should be interpreted as including one or at least one, and the elements or components in the singular form also include the plural form, unless the number is obviously intended to be in the singular form.

[0021] In the description of the present invention, “plurality” means two or more than two, unless otherwise clearly and specifically defined.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] Reference Figure 1 , an energy-saving method for a hydraulic station of a machining center, the hydraulic station of the machining center includes an oil tank 1, a high-pressure filter 2, a permanent magnet motor 3, a plunger pump 4, an overflow valve 5, a reflux filter 6, a one-way valve 7, a pressure sensor 8, a pressure-stabilizing tank 9, a reversing valve 10, an oil cylinder 11 and a pipeline. The energy-saving method includes: connecting the pressure sensor to the pipeline to control the permanent magnet motor to stop when the pressure reaches a set pressure value, and when the pressure is lower than the set pressure value, the permanent magnet motor starts to convey oil for pressurization.

[0026] Reference Figure 1 , an energy-saving method for a hydraulic station of a machining center, wherein the pipeline includes an upper oil pipe, a return oil pipe, an overflow pipe and a branch oil pipe, the upper oil pipe and the return oil pipe are connected between a fuel tank 1 and a fuel cylinder 11, the overflow pipe is connected between the upper oil pipe and the return oil pipe, the branch oil pipe is connected to the upper oil pipe, a high-pressure filter 2 is close to the fuel tank 1, a plunger pump 4 is connected in the upper oil pipe, and a permanent magnet motor 3 is connected to the plunger pump 4, an overflow valve 5 is connected to the overflow pipe, a reflux filter 6 is connected to the return oil pipe, a one-way valve 7 is connected to the high-pressure filter 2 in the upper oil pipe, a pressure sensor 8 is connected in the branch oil pipe, a pressure-stabilizing tank 9 is connected to the upper oil pipe through a branch oil pipe, a reversing valve 10 is connected in the upper oil pipe and the return oil pipe, and the reversing valve 10 is close to the fuel cylinder 11.

[0027] Reference Figure 1, an energy-saving method for a hydraulic station of a machining center. When pressurized, the permanent magnet motor 3 works to drive the plunger pump 4 to work. The plunger pump 4 draws the oil in the oil tank 1 through the upper oil pipe through the high-pressure filter 2 and passes through the one-way valve 7, wherein the one-way valve 7 can prevent the oil from flowing back to the oil tank 1. The oil in the upper oil pipe enters the oil cylinder 11 through the reversing valve 10. When the oil cylinder 11 is filled with oil, the oil that continues to be pumped into the oil cylinder 11 will enter the pressure-stabilizing tank 9 through the branch oil pipe. When the pressure-stabilizing tank 9 is filled with oil and the pressure sensor 8 detects that the pressure in the pressure-stabilizing tank 9 reaches the set value, the pressure sensor 8 sends a signal to the inverter on the permanent magnet motor 3, and the inverter controls the permanent magnet The motor 3 stops. When the pressure in the pressure-stabilizing tank 9 is insufficient, the pressure sensor 8 sends a signal to the frequency converter on the permanent magnet motor 3. The frequency converter controls the permanent magnet motor 3 to start and continue to pump and pressurize the oil, thereby increasing the pressure in the oil cylinder 11 for use. The reversing valve 1 here makes the upper oil pipe unobstructed; when pressure relief is required, the reversing valve 10 switches to make the return oil pipe unobstructed and flow-through, so that the oil in the oil cylinder 11 is filtered from the return oil pipe through the reflux filter 6 and then flows back to the oil tank 1; when the reflux is not timely, the oil in the return oil pipe that flows into the oil tank 1 without passing through the reflux filter 6 flows back into the overflow pipe and then enters the upper oil pipe. At this time, the overflow valve 5 is open to keep the overflow pipe unobstructed.

[0028] Reference Figure 2 , an energy-saving method for a hydraulic station of a machining center: AI1 actual value < lower limit value - 0.5 × hysteresis, 32.01 monitoring status bit 0, set to 1, RO2 closed, DI1 and +24V closed, pressure sensor 8 gives a signal to the inverter on the permanent magnet motor 3, and the inverter controls the permanent magnet motor 3 to start; AI1 actual value > lower limit value + 0.5 × hysteresis, 32.01 monitoring status bit 0, set to 0, RO2 disconnected, DI1 and +24V disconnected, pressure sensor 8 gives a signal to the inverter on the permanent magnet motor 3, the inverter controls the permanent magnet motor 3 to stop, and the permanent magnet motor 3 stops working output.

[0029] The examples referred to herein are merely illustrative and are used to explain some features of the method of the present invention. The appended claims are intended to claim the widest possible range that can be imagined, and the embodiments presented herein are only illustrations of selected implementations according to the combination of all possible embodiments. Therefore, it is the applicant's intention that the appended claims are not limited by the selection of examples that illustrate the features of the present invention. Some numerical ranges used in the claims also include sub-ranges within them, and changes in these ranges should also be interpreted as being covered by the appended claims where possible.

Claims

1. A method for energy saving of a hydraulic station of a machining center, the hydraulic station of the machining center comprising an oil tank (1), a high pressure filter (2), a permanent magnet motor (3), a plunger pump (4), an overflow valve (5), a reflux filter (6), a check valve (7), a pressure sensor (8), a pressure regulating tank (9), a reversing valve (10), an oil cylinder (11) and a pipeline, characterized in that: The energy-saving method includes: connecting a pressure sensor in the pipeline to control the permanent magnet motor to stop when the pressure reaches a set pressure value, and starting the permanent magnet motor to convey oil medium for pressurization when the pressure is lower than the set pressure value.

2. The energy-saving method for a hydraulic station of a machining center according to claim 1, characterized in that: The pipeline comprises an upper oil pipe, an oil return pipe, an overflow pipe and a branch oil pipe. The upper oil pipe and the oil return pipe are connected between the oil tank (1) and the oil cylinder (11). The overflow pipe is connected between the upper oil pipe and the oil return pipe. The branch oil pipe is connected to the upper oil pipe.

3. The energy-saving method for a hydraulic station of a machining center according to claim 1, characterized in that: The pressure sensor (8) is connected to the branch oil pipe, and the pressure stabilizing tank (9) is connected to the upper oil pipe through the branch oil pipe.

4. The energy-saving method for a hydraulic station of a machining center according to claim 1, characterized in that: The one-way valve (7) is connected to the high-pressure filter (2) in the upper oil pipe, the high-pressure filter (2) is close to the oil tank (1), and the reflux filter (6) is connected to the return oil pipe.

5. The energy-saving method for a hydraulic station of a machining center according to claim 1, characterized in that: The reversing valve (10) is connected to the upper oil pipe and the oil return pipe, and the reversing valve (10) is close to the oil cylinder (11).

6. The energy-saving method for a hydraulic station of a machining center according to claim 1, characterized in that: The plunger pump (4) is connected to the upper oil pipe, and the permanent magnet motor (3) is connected to the plunger pump (4).

7. The energy-saving method for a hydraulic station of a machining center according to claim 1, characterized in that: The overflow valve (5) is connected to the overflow pipe.

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