Variable-speed hydraulic system with oil supplementing mechanism

Abstract

The utility model discloses a variable-speed hydraulic system with an oil supplementing mechanism. The variable-speed hydraulic system comprises a closed system pipeline, the oil recharging device comprises a first oil recharging mechanism and a second oil recharging mechanism, the first oil recharging mechanism and the second oil recharging mechanism are both connected with a closed system pipeline, the first oil recharging mechanism comprises an energy accumulator and a first electromagnetic valve, one end of the first electromagnetic valve is connected with the energy accumulator, and the other end of the first electromagnetic valve is connected with the closed system pipeline; the first oil supplementing mechanism and the second oil supplementing mechanism can be switched to work so as to supplement hydraulic oil to the closed system pipeline; the flow control mechanism comprises a variable-speed pump and a servo motor, the variable-speed pump is connected with the closed system pipeline, and the power output end of the servo motor is connected with a driving shaft of the variable-speed pump so as to control the flow of the hydraulic oil in the closed system pipeline. The variable-speed pump control system can accurately control the flow of hydraulic oil output by the variable-speed hydraulic system, and can realize convenient and fast internal oil supplementation of the variable-speed pump control system.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic system speed control technology, and in particular to a speed-changing hydraulic system with a replenishing oil mechanism. Background Technology

[0002] In complex machining scenarios, the requirements for the response speed, movement speed, and reliability of hydraulic press cylinder movements are relatively high. However, the traditional variable-speed pump control system of hydraulic presses has a slow working cycle and sluggish response, making it difficult to meet the precise control of the hydraulic press cylinder movement required in high-precision machining processes. The control cylinder cannot meet the differentiated requirements for pressure, stroke, and speed. On the other hand, various leaks are inherent in the operation of closed hydraulic systems. With long-term use, the oil level in the system will gradually decrease. When the oil level in the system decreases to a certain extent, it can easily lead to problems such as system malfunction and damage to hydraulic components, requiring oil replenishment. However, using a combination of replenishment cylinder and oil pump for oil replenishment is relatively inconvenient. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a variable-speed hydraulic system with a replenishing oil mechanism, which can precisely control the output hydraulic oil flow rate and achieve convenient internal replenishment of the variable-speed hydraulic system.

[0004] A variable-speed hydraulic system with a replenishing mechanism according to an embodiment of the present invention includes:

[0005] Closed-loop system piping;

[0006] The oil replenishment device includes a first oil replenishment mechanism and a second oil replenishment mechanism. Both the first oil replenishment mechanism and the second oil replenishment mechanism are connected to the closed system pipeline. The first oil replenishment mechanism includes an accumulator and a first solenoid valve. One end of the first solenoid valve is connected to the accumulator, and the other end of the first solenoid valve is connected to the closed system pipeline. The first oil replenishment mechanism and the second oil replenishment mechanism can switch operations to replenish hydraulic oil to the closed system pipeline.

[0007] The flow control mechanism includes a variable speed pump and a servo motor. The variable speed pump is connected to the closed system pipeline, and the power output end of the servo motor is connected to the drive shaft of the variable speed pump to control the flow rate of hydraulic oil in the closed system pipeline.

[0008] The variable-speed hydraulic system with an oil replenishment mechanism according to an embodiment of this utility model has at least the following beneficial effects: A servo motor drives the variable-speed pump; since the servo motor can be steplessly speed-regulated, the flow rate of the hydraulic oil output by the variable-speed pump can be precisely controlled. After connecting the variable-speed hydraulic system to a hydraulic press, the working speed of the hydraulic press cylinder can be precisely controlled by precisely controlling the hydraulic oil output. Since the servo motor can operate in both forward and reverse directions, the flow direction of the hydraulic oil in the closed-loop system pipeline can be controlled, thereby controlling the extension and retraction of the hydraulic press cylinder. Due to the high speed of the servo motor, the working cycle of the hydraulic oil can be accelerated, and the displacement of the variable-speed pump can be quickly changed, realizing rapid speed change of the variable-speed hydraulic system. An accumulator stores hydraulic oil; when the hydraulic oil in the variable-speed hydraulic system gradually decreases to a certain level, the first solenoid valve is opened, replenishing the hydraulic oil stored in the accumulator to the closed-loop system pipeline. This avoids problems such as poor operation, slow response speed, and damage to hydraulic components in the hydraulic system, making it easy to operate, convenient, quick, and with high oil replenishment efficiency.

[0009] According to an embodiment of the present invention, a variable speed hydraulic system with a replenishing mechanism is provided, wherein the first replenishing mechanism further includes a first check valve, which is disposed on the connecting pipeline between the first solenoid valve and the closed system pipeline.

[0010] According to the embodiment of the present utility model, the variable speed hydraulic system with a replenishing mechanism further includes a first shut-off valve. One end of the first shut-off valve is connected to the accumulator through a pipeline, and the other end of the first shut-off valve is connected to an external oil circuit to replenish the accumulator with oil.

[0011] According to an embodiment of the present invention, a variable speed hydraulic system with a replenishing mechanism is provided, wherein the first replenishing mechanism further includes a first pressure sensor, which is connected to an accumulator via a pipeline.

[0012] According to an embodiment of the present invention, a variable speed hydraulic system with a replenishing mechanism includes a second replenishing mechanism comprising a second shut-off valve and a second check valve connected sequentially along the hydraulic oil delivery direction. The end of the second shut-off valve away from the second check valve is connected to an external oil circuit, and the end of the second check valve away from the second shut-off valve is connected to a closed system pipeline.

[0013] The variable speed hydraulic system with a replenishing mechanism according to an embodiment of the present invention further includes a housing, on which an overflow valve is provided. The first replenishing mechanism further includes a first check valve. The oil outlet of the first check valve is connected to a closed system pipeline, the oil pressure end of the overflow valve is connected to a closed system pipeline, and the oil overflow end of the overflow valve is connected to the oil inlet end of the first check valve through a pipeline to form a closed pressure relief circuit.

[0014] According to the present invention, a variable speed hydraulic system with an oil replenishment mechanism is provided on the chassis, and the flow control mechanism also includes an air cooler. The air cooler is fixed on the chassis, and the two ends of the air cooler are respectively connected to the oil drain port of the variable speed pump and the oil inlet of the third check valve through pipes. The oil outlet of the third check valve is connected to the oil inlet of the first check valve.

[0015] According to an embodiment of the present invention, a variable speed hydraulic system with an oil replenishment mechanism is provided on the chassis, and the temperature sensor is located on the connecting pipe between the third check valve and the air cooler.

[0016] The variable-speed hydraulic system with a replenishing mechanism according to an embodiment of the present invention further includes a filter assembly, which includes a filter and a second solenoid valve. The filter is connected to the second solenoid valve through a pipeline. The end of the filter away from the second solenoid valve is connected to a closed-loop system pipeline, and the end of the second solenoid valve away from the filter is also connected to a closed-loop system pipeline.

[0017] According to an embodiment of the present invention, a differential pressure transmitter is installed inside the filter of a variable speed hydraulic system with an oil replenishment mechanism.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a perspective view of a variable speed hydraulic system with an oil replenishment mechanism according to an embodiment of the present invention.

[0021] Figure 2 This is a left view of a variable-speed hydraulic system with a replenishing oil mechanism according to an embodiment of the present invention;

[0022] Figure 3 This is a right view of a variable-speed hydraulic system with an oil replenishment mechanism according to an embodiment of the present invention;

[0023] Figure 4 This is a front view of a variable-speed hydraulic system with a replenishing oil mechanism according to an embodiment of the present invention, wherein the pressure relief oil pipeline and the air cooler have been removed.

[0024] Explanation of reference numerals in the attached figures:

[0025] Chassis 100; First oil circuit pipe 110; Second oil circuit pipe 120; Pressure relief oil circuit pipe 130;

[0026] Flow control mechanism 200; variable speed pump 210; servo motor 220; air cooler 230;

[0027] Accumulator 310; First solenoid valve 320; First check valve 330; Second check valve 340; Third check valve 350; First shut-off valve 360; Second shut-off valve 370;

[0028] Temperature sensor 400;

[0029] First pressure sensor 510; Second pressure sensor 520;

[0030] 600 relief valve;

[0031] Filter assembly 700; Filter 710; Second solenoid valve 720;

[0032] Differential pressure transmitter 800. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0034] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] In the description of a utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first" and "second" are used, they are merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or the order of the indicated technical features.

[0036] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0037] Reference Figures 1 to 4This utility model embodiment provides a variable speed hydraulic system with an oil replenishment mechanism, including: a closed system pipeline; an oil replenishment device, including a first oil replenishment mechanism and a second oil replenishment mechanism, both of which are connected to the closed system pipeline; the first oil replenishment mechanism includes an accumulator 310 and a first solenoid valve 320, one end of the first solenoid valve 320 is connected to the accumulator 310, and the other end of the first solenoid valve 320 is connected to the closed system pipeline; the first oil replenishment mechanism and the second oil replenishment mechanism can switch operations to replenish hydraulic oil to the closed system pipeline; and a flow control mechanism 200, including a variable speed pump 210 and a servo motor 220, wherein the variable speed pump 210 can be a hydraulic variable speed pump such as a piston pump or a gear pump, the variable speed pump 210 is connected to the closed system pipeline, and the power output end of the servo motor 220 is connected to the drive shaft of the variable speed pump 210.

[0038] The variable speed pump 210 is driven by a servo motor 220. Since the servo motor 220 can be steplessly speed-regulated, the flow rate of hydraulic oil output by the variable speed pump 210 can be precisely controlled. After the variable speed hydraulic system is connected to the hydraulic press, the working speed of the hydraulic press cylinder can be precisely controlled by precisely controlling the hydraulic oil output. Since the servo motor 220 can work in both forward and reverse directions, the flow direction of hydraulic oil in the closed system pipeline can be controlled, thereby controlling the extension and retraction of the connected hydraulic press cylinder. Due to the high speed of the servo motor 220, the working cycle of hydraulic oil can be accelerated, and the displacement of the variable speed pump 210 can be quickly changed to realize the rapid speed change of the variable speed hydraulic system.

[0039] Hydraulic oil is stored in the accumulator 310. When the hydraulic oil in the transmission hydraulic system gradually decreases to a certain level, the first solenoid valve 320 is opened to replenish the hydraulic oil stored in the accumulator 310 into the closed system pipeline. This avoids problems such as poor operation, slow response speed, and damage to hydraulic components in the hydraulic system. It is easy to operate, convenient and quick, and has high oil replenishment efficiency.

[0040] Specifically, the closed-loop system pipeline consists of a first oil circuit pipeline 110 and a second oil circuit pipeline 120. The two suction ports of the variable speed pump 210 are connected to the first oil circuit pipeline 110 and the second oil circuit pipeline 120, respectively. The first solenoid valve 320 is connected to the first oil circuit pipeline 110 to replenish hydraulic oil to the first oil circuit pipeline 110; or, the first solenoid valve 320 is connected to the second oil circuit pipeline 120 to replenish hydraulic oil to the second oil circuit pipeline 120.

[0041] According to some embodiments of this application, the first oil replenishment mechanism further includes a first check valve 330, which is disposed on the connection pipeline between the first solenoid valve 320 and the closed system pipeline. This enables the first oil replenishment mechanism to provide one-way oil replenishment to the closed system pipeline, preventing hydraulic oil from flowing back into the accumulator 310.

[0042] As a preferred embodiment, two first check valves 330 are provided. One of the first check valves 330 is connected to the first solenoid valve 320 and the first oil line 110 at both ends, and the other first check valve 330 is connected to the first solenoid valve 320 and the second oil line 120 at both ends, so that hydraulic oil can be supplied to the first oil line 110 and the second oil line 120 at the same time.

[0043] According to some embodiments of this application, the first oil replenishment mechanism further includes a first shut-off valve 360, one end of which is connected to the accumulator 310 via a pipeline, and the other end of which is connected to an external oil circuit to replenish the accumulator 310 with oil.

[0044] According to some embodiments of this application, the first oil replenishment mechanism further includes a first pressure sensor 510, which is connected to the accumulator 310 through a pipeline. The first pressure sensor 510 is used to detect the pressure of the accumulator 310, thereby obtaining the real-time oil storage capacity of the accumulator 310.

[0045] According to some embodiments of this application, the second oil replenishment mechanism includes a second shut-off valve 370 and a second check valve 340 connected sequentially along the hydraulic oil delivery direction. The end of the second shut-off valve 370 away from the second check valve 340 is connected to an external oil circuit, and the end of the second check valve 340 away from the second shut-off valve 370 is connected to a closed-loop system pipeline. By closing the first solenoid valve 320 and opening the second shut-off valve 370, the second oil replenishment mechanism is switched to replenish oil to the closed-loop system pipeline. This effectively addresses the oil replenishment needs of the transmission hydraulic system when the first oil replenishment mechanism fails, and better ensures the stability of the hydraulic oil pressure in the transmission hydraulic system.

[0046] According to some embodiments of this application, a chassis 100 is also included, on which an overflow valve 600 is provided. The first oil replenishment mechanism further includes a first check valve 330. The oil outlet of the first check valve 330 is connected to the closed-loop system pipeline, and the oil pressure end of the overflow valve 600 is connected to the closed-loop system pipeline. The oil overflow end of the overflow valve 600 is connected to the oil inlet end of the first check valve 330 through a pipeline to form a closed-loop pressure relief circuit. When the hydraulic oil pressure in the closed-loop system pipeline is higher than the set value of the overflow valve 600, the overflow valve 600 starts to relieve pressure, discharging the high-pressure hydraulic oil into the connecting pipeline between the overflow valve 600 and the first check valve 330, ensuring the safe operation of the closed-loop system pipeline.

[0047] As a preferred option, two sets of closed-loop pressure relief circuits are provided; one set of closed-loop pressure relief circuits is connected to the first oil line pipeline 110, and the other set of closed-loop pressure relief circuits is connected to the second oil line pipeline 120, which can safely relieve pressure on the first oil line pipeline 110 and the second oil line pipeline 120 respectively.

[0048] In some applications, the chassis 100 is also equipped with a second pressure sensor 520. The two second pressure sensors 520 are connected to the first oil circuit pipe 110 and the second oil circuit pipe 120 respectively through pipes to obtain the real-time oil pressure of the first oil circuit pipe 110 and the second oil circuit pipe 120, thereby improving the safety of the closed system pipeline.

[0049] Furthermore, a third check valve 350 is provided on the chassis 100, and the flow control mechanism 200 also includes an air cooler 230. The air cooler 230 is fixed on the chassis 100, and its two ends are connected to the oil drain port of the transmission pump 210 and the oil inlet of the third check valve 350 respectively via pipes. The oil outlet of the third check valve 350 is connected to the oil inlet of the first check valve 330. The pipe between the oil drain port of the transmission pump 210 and the oil inlet of the third check valve 350 forms a pressure relief oil circuit 130. The air cooler 230 is installed on the pressure relief oil circuit 130, which can cool the leaking oil from the transmission pump 210 and then return it to the closed system pipeline.

[0050] Furthermore, a temperature sensor 400 is also installed on the chassis 100. The temperature sensor 400 is located on the connecting pipe between the third one-way valve 350 and the air cooler 230, and can monitor the temperature of the leaked oil after it has been cooled by the air cooler 230.

[0051] According to some embodiments of this application, a filter assembly 700 is also included. The filter assembly 700 includes a filter 710 and a second solenoid valve 720. The filter 710 is connected to the second solenoid valve 720 via a pipe. The end of the filter 710 away from the second solenoid valve 720 is connected to a closed-loop system pipeline, and the end of the second solenoid valve 720 away from the filter 710 is also connected to a closed-loop system pipeline. The filter assembly 700 is used to filter the hydraulic oil in the closed-loop system pipeline, reducing impurities.

[0052] Specifically, both ends of the filter assembly 700 are connected to the first oil passage 110 to filter the hydraulic oil in the first oil passage 110; or, both ends of the filter assembly 700 are connected to the second oil passage 120 to filter the hydraulic oil in the second oil passage 120; or, both ends of the filter assembly 700 are connected to the first oil passage 110 and the second oil passage 120 respectively to filter the hydraulic oil in the first oil passage 110 and the second oil passage 120.

[0053] As a preferred embodiment, two second solenoid valves 720 are provided. The two ends of the filter 710 are connected to the two second solenoid valves 720 respectively through pipes. One end of the second solenoid valve 720 away from the filter 710 is connected to the first oil circuit pipe 110, and the other end of the second solenoid valve 720 away from the filter 710 is connected to the second oil circuit pipe 120 to filter the hydraulic oil in the first oil circuit pipe 110 and the second oil circuit pipe 120. When both second solenoid valves 720 are closed at the same time, the filter 710 is disconnected from the closed system pipeline, which allows the filter 710 to be repaired or replaced.

[0054] Furthermore, a differential pressure transmitter 800 is installed inside the filter 710 to monitor the clogging status of the filter 710 in real time so that the filter 710 can be replaced in a timely manner.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A variable-speed hydraulic system with a replenishing oil mechanism, characterized in that, include: Closed-loop system piping; The oil replenishment device includes a first oil replenishment mechanism and a second oil replenishment mechanism. Both the first oil replenishment mechanism and the second oil replenishment mechanism are connected to the closed system pipeline. The first oil replenishment mechanism includes an accumulator (310) and a first solenoid valve (320). One end of the first solenoid valve (320) is connected to the accumulator (310), and the other end of the first solenoid valve (320) is connected to the closed system pipeline. The first oil replenishment mechanism and the second oil replenishment mechanism can switch operations to replenish hydraulic oil to the closed system pipeline. The flow control mechanism (200) includes a variable speed pump (210) and a servo motor (220). The variable speed pump (210) is connected to the closed system pipeline, and the power output end of the servo motor (220) is connected to the drive shaft of the variable speed pump (210) to control the flow rate of hydraulic oil in the closed system pipeline.

2. The variable-speed hydraulic system with a replenishing mechanism according to claim 1, characterized in that, The first oil replenishment mechanism also includes a first check valve (330), which is disposed on the connection pipeline between the first solenoid valve (320) and the closed system pipeline.

3. The variable-speed hydraulic system with a replenishing mechanism according to claim 1, characterized in that, The first oil replenishment mechanism also includes a first shut-off valve (360), one end of which is connected to the accumulator (310) via a pipeline, and the other end of which is connected to an external oil circuit to replenish the accumulator (310) with oil.

4. The variable-speed hydraulic system with a replenishing oil mechanism according to claim 1, characterized in that, The first oil replenishment mechanism also includes a first pressure sensor (510), which is connected to the accumulator (310) via a pipeline.

5. The variable-speed hydraulic system with a replenishing oil mechanism according to claim 1, characterized in that, The second oil replenishment mechanism includes a second shut-off valve (370) and a second check valve (340) connected sequentially along the hydraulic oil delivery direction. The end of the second shut-off valve (370) away from the second check valve (340) is connected to an external oil line, and the end of the second check valve (340) away from the second shut-off valve (370) is connected to the closed system pipeline.

6. The variable-speed hydraulic system with a replenishing oil mechanism according to claim 1, characterized in that, It also includes a chassis (100), on which an overflow valve (600) is provided. The first oil replenishment mechanism also includes a first check valve (330). The oil outlet of the first check valve (330) is connected to the closed system pipeline. The oil pressure end of the overflow valve (600) is connected to the closed system pipeline. The oil overflow end of the overflow valve (600) is connected to the oil inlet end of the first check valve (330) through a pipeline to form a closed pressure relief circuit.

7. The variable-speed hydraulic system with a replenishing mechanism according to claim 6, characterized in that, The chassis (100) is provided with a third check valve (350). The flow control mechanism (200) also includes an air cooler (230). The air cooler (230) is fixed on the chassis (100). The two ends of the air cooler (230) are respectively connected to the oil drain port of the variable speed pump (210) and the oil inlet of the third check valve (350) through pipes. The oil outlet of the third check valve (350) is connected to the oil inlet of the first check valve (330).

8. The variable-speed hydraulic system with a replenishing mechanism according to claim 7, characterized in that, A temperature sensor (400) is also provided on the chassis (100), and the temperature sensor (400) is located on the connecting pipe between the third one-way valve (350) and the air cooler (230).

9. The variable-speed hydraulic system with a replenishing oil mechanism according to claim 1, characterized in that, It also includes a filter assembly (700), which includes a filter (710) and a second solenoid valve (720). The filter (710) is connected to the second solenoid valve (720) via a pipe. The end of the filter (710) away from the second solenoid valve (720) is connected to the closed system pipeline, and the end of the second solenoid valve (720) away from the filter (710) is also connected to the closed system pipeline.

10. The variable-speed hydraulic system with a replenishing mechanism according to claim 9, characterized in that, A differential pressure transmitter (800) is installed inside the filter (710).

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