Hydraulic control device and power device

Abstract

This application provides a hydraulic control device and a power device. The hydraulic control device includes an oil tank, an oil pump, a solenoid valve, a power unit, and a booster cylinder. The oil tank, oil pump, solenoid valve, and power unit are connected sequentially via a main pipeline. The solenoid valve has an oil inlet, a first oil outlet, and a second oil outlet. The oil inlet is connected to the oil pump, the first oil outlet is connected to the power unit via the main pipeline, and the second oil outlet is connected to the power unit via a secondary pipeline. The booster cylinder is arranged on the secondary pipeline. The oil inlet can optionally be connected to either the first or the second oil outlet. By adding a secondary pipeline and a booster cylinder, and utilizing the solenoid valve to selectively connect the oil inlet to either the first or second oil outlet, this application allows for automatic switching to the secondary pipeline when the oil pump pressure is unstable, and pressure compensation via the booster cylinder. This eliminates the need for manual intervention during maintenance, thus improving the stability and safety of the hydraulic control device.

Description

Technical Field

[0001] This application relates to the field of hydraulic control technology, and in particular to a hydraulic control device and a power device. Background Technology

[0002] Existing hydraulic control devices typically employ a single oil circuit structure, with an oil pump directly supplying oil to the power equipment. However, in actual use, the pressure output by the oil pump is prone to fluctuations or instability, leading to abnormal device operation. This often necessitates shutdown and entry of maintenance personnel for repairs, which is not only inconvenient and costly but also poses certain safety risks. Utility Model Content

[0003] This application provides a hydraulic control device and a power device, which can improve the stability and safety of the hydraulic control device.

[0004] According to a first aspect of the embodiments of this specification, a hydraulic control device is provided, comprising an oil tank, an oil pump, a solenoid valve, a power device, and a booster cylinder; the oil tank, the oil pump, the solenoid valve, and the power device are sequentially connected via a main pipeline; the solenoid valve is provided with an oil inlet, a first oil outlet, and a second oil outlet; the oil inlet is connected to the oil pump, the first oil outlet is connected to the power device via the main pipeline, the second oil outlet is connected to the power device via a secondary pipeline, and the booster cylinder is arranged on the secondary pipeline;

[0005] The oil inlet may optionally be connected to either the first oil outlet or the second oil outlet.

[0006] Furthermore, the solenoid valve is a two-position four-way valve; the oil inlet includes a first oil inlet and a second oil inlet, the first oil inlet is connected to the first oil outlet, and the second oil inlet is connected to the second oil outlet.

[0007] The solenoid valve can selectively connect the first oil inlet and the first oil outlet, or connect the second oil inlet and the second oil outlet.

[0008] Furthermore, it also includes a pressure sensor and a controller. The pressure sensor is located at the oil outlet of the oil pump. The signal input terminal of the controller is connected to the pressure sensor, and the signal output terminal of the controller is connected to the solenoid valve. The controller controls the oil inlet to be connected to the first oil outlet or the second oil outlet according to the pressure detected by the pressure sensor.

[0009] Furthermore, when the pressure value fed back by the pressure sensor is less than a preset pressure threshold, the controller controls the oil inlet to connect with the second oil outlet; when the pressure value fed back by the pressure sensor is greater than or equal to the preset pressure threshold, the controller controls the oil inlet to connect with the first oil outlet.

[0010] Furthermore, when the pressure value fed back by the pressure sensor is greater than or equal to a first preset pressure threshold, less than a second preset pressure threshold, and the duration is greater than a preset time, the controller controls the oil inlet to connect with the second oil outlet.

[0011] When the pressure value fed back by the pressure sensor is greater than or equal to a first preset pressure threshold, less than a second preset pressure threshold, and the duration is less than or equal to a preset time, the controller controls the oil inlet to connect with the first oil outlet.

[0012] Furthermore, the first preset pressure threshold is 7 MPa, the second preset pressure threshold is 8 MPa, and the preset time is 2 seconds.

[0013] Furthermore, the controller is controlled by a PLC or a microcontroller.

[0014] Furthermore, it also includes a return oil pipeline and a hydraulic cylinder. One end of the return oil pipeline is connected to the oil outlet of the power equipment, and the other end is connected to the oil tank. The hydraulic cylinder is arranged on the return oil pipeline.

[0015] According to a second aspect of the embodiments of this specification, a power device is provided, including a fence and the hydraulic control device described in the first aspect, wherein the hydraulic control device is disposed within the fence.

[0016] Furthermore, it also includes an interlocking module, and the hydraulic control device further includes a controller, the signal input terminal of which is connected to the interlocking module, and the signal output terminal of which is connected to the solenoid valve; the interlocking module is electrically connected to the fence gate lock;

[0017] When the controller determines that the fence gate lock is open based on the interlocking module, it controls the oil inlet of the solenoid valve to connect with the first oil outlet.

[0018] This application has the following beneficial effects: By adding a secondary pipeline and a booster cylinder, and using a solenoid valve to achieve selective connection between the oil inlet and the first or second oil outlet, this application can automatically switch to the secondary pipeline when the oil pump pressure is unstable, and perform booster compensation through the booster cylinder. No manual intervention is required for maintenance, which improves the stability and safety of the hydraulic control device.

[0019] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this specification. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this specification and, together with the description, serve to explain the principles of this specification.

[0021] Figure 1 This is a schematic diagram of a hydraulic control device according to an exemplary embodiment;

[0022] Figure 2 This is a schematic diagram of a hydraulic control device according to another exemplary embodiment;

[0023] Figure 3 This is a schematic diagram of a hydraulic control device according to another exemplary embodiment;

[0024] Figure 4 This is a schematic diagram of a hydraulic control device according to another exemplary embodiment;

[0025] Figure 5 This is a schematic diagram of a hydraulic control device according to another exemplary embodiment.

[0026] Explanation of reference numerals in the attached figures:

[0027] 10-Oil tank; 20-Oil pump; 30-Solenoid valve; 31-Oil inlet; 32-First oil outlet; 33-Second oil outlet; 40-Power equipment; 50-Booster cylinder; 60-Pressure sensor; 70-Controller; 80-Oil cylinder; 90-Interlock module; 100-Main pipeline; 200-Secondary pipeline; 300-Return oil pipeline. Detailed Implementation

[0028] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0029] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movements between components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0030] The embodiments described in this specification will now be described in detail.

[0031] Reference Figure 1 and Figure 2 As shown, this application discloses a hydraulic control device, which includes an oil tank 10, an oil pump 20, a solenoid valve 30, a power unit 40, a booster cylinder 50, a pressure sensor 60, a controller 70, and an oil cylinder 80. The oil tank 10, oil pump 20, solenoid valve 30, and power unit 40 are connected sequentially through a main pipeline 100, and oil flows in the direction of the arrow in the figure.

[0032] The oil tank 10 serves the function of storing and recovering oil. However, in order to ensure that the oil output from the oil tank 10 can meet the operating requirements of different power equipment 40, an oil pump 20 is installed at the oil outlet of the oil tank 10 to regulate the hydraulic pressure.

[0033] The oil tank 10 can be designed with a partitioned structure, internally divided into an oil suction zone, an oil return zone, and a sedimentation zone by baffles. The recovered oil first enters the oil return zone, then slowly flows through damping holes in the baffle into the sedimentation zone, where impurities settle. Finally, the clean oil overflows into the oil suction zone for pump 20 to extract. This design effectively extends the service life of the hydraulic oil and reduces the frequency of filter replacement.

[0034] The oil tank 10 can also be equipped with a liquid level sensor and an oil quality sensor (such as a moisture sensor and a particle size sensor). The signals from these sensors are connected to the controller 70. Once the liquid level is too low or the oil deteriorates beyond the allowable range, the controller can not only issue an audible and visual alarm, but also perform degraded operation or safe shutdown according to a preset program to ensure the quality of the output oil.

[0035] The oil tank 10 can also integrate an electric heater and an air-cooled radiator, with the oil temperature monitored by the controller 70. When the hydraulic oil temperature is below the set lower limit (e.g., 10°C), the viscosity increases, and the electric heater starts to ensure that the oil pump 20 draws oil normally. When the oil temperature is above the set upper limit (e.g., 65°C), the radiator starts to prevent oil oxidation and seal aging, enabling the hydraulic control device to adapt to extremely cold or high-temperature and high-load operating conditions.

[0036] The inlet of the oil pump 20 is connected to the oil tank 10 via the main pipeline 100, which pressurizes the hydraulic oil in the oil tank 10 and pumps it out to provide a power source for the entire hydraulic control device. The pressurization pressure of the oil pump 20 can be adjusted in a timely manner based on the flow loss of the oil and the working pressure of the power equipment 40 to adapt to the operating requirements of different power equipment 40s.

[0037] In one embodiment, the oil pump 20 is a pressure-compensated variable displacement axial piston pump, characterized in that when the system pressure is lower than a set value, the oil pump 20 can output at maximum displacement to provide maximum flow. When the pressure reaches the set value (the set value is adjustable), the displacement of the oil pump 20 automatically decreases, outputting only the small flow required to replenish system leakage, thereby significantly reducing energy consumption and heat generation.

[0038] Furthermore, considering application scenarios with drastic changes in flow demand, a combination of two fixed-displacement oil pumps 20, one large and one small, can be used. The small-displacement oil pump 20 operates continuously as the main pump, meeting the basic needs of the power equipment 40. The large-displacement oil pump 20 acts as an auxiliary pump, only engaging its electromagnetic clutch when the controller 70 detects insufficient pressure and requires the activation of the booster cylinder 50, thus coordinating oil supply. In this way, only the small-displacement oil pump 20 operates most of the time, resulting in significant energy savings.

[0039] The solenoid valve 30 is provided with an oil inlet 31, a first oil outlet 32, and a second oil outlet 33. The oil inlet 31 is connected to the oil pump 20, the first oil outlet 32 ​​is connected to the power equipment 40 through the main pipeline 100, and the second oil outlet 33 is connected to the power equipment 40 through the auxiliary pipeline 200. The booster cylinder 50 is arranged on the auxiliary pipeline 200.

[0040] The oil inlet 31 can be optionally connected to either the first oil outlet 32 ​​or the second oil outlet 33. When the oil inlet 31 is connected to the first oil outlet 32, it proves that the oil flowing out of the oil tank 10 and the oil pump 20 meets the standard for driving the power equipment 40.

[0041] When the oil inlet 31 is connected to the second oil outlet 33, it indicates that the oil flowing out of the oil tank 10 and oil pump 20 does not meet the operating standards of the power equipment 40. The oil is then automatically switched to the secondary pipeline 200 and automatically pressurized by the booster cylinder 50, eliminating the need for manual intervention and improving the stability and safety of the hydraulic control device. The pressure value boosted by the booster cylinder 50 is consistent with the operating pressure required by the power equipment 40.

[0042] In one embodiment, the solenoid valve 30 is a two-position four-way valve. The oil inlet 31 includes a first oil inlet and a second oil inlet, the first oil inlet being connected to a first oil outlet 32, and the second oil inlet being connected to a second oil outlet 33. The solenoid valve 30 can selectively connect the first oil inlet and the first oil outlet 32, or connect the second oil inlet and the second oil outlet 33.

[0043] In another embodiment, the solenoid valve 30 is a two-position three-way valve. The oil inlet 31 includes a first oil inlet, which can be connected to either a first oil outlet 32 ​​or a second oil outlet 33. The solenoid valve 30 can selectively connect the first oil inlet and the first oil outlet 32, or connect the first oil inlet and the second oil outlet 33.

[0044] Please refer to the reference again. Figure 3 As shown, the pressure sensor 60 is installed at the oil outlet of the oil pump 20 to monitor the pressure status of the oil output by the oil pump 20 in real time and provide a key pressure feedback signal to the controller 70.

[0045] The signal input terminal of the controller 70 is connected to the pressure sensor 60 to receive real-time pressure data. The signal output terminal of the controller 70 is connected to the solenoid valve 30, thereby enabling precise control of the working state of the solenoid valve 30 based on the feedback signal from the pressure sensor 60, achieving automatic switching between the oil inlet 31 and the first oil outlet 32 ​​or the second oil outlet 33, without requiring shutdown or opening of the door for maintenance and debugging.

[0046] Specifically, when the pressure value fed back by the pressure sensor 60 is less than a preset pressure threshold, the controller 70 controls the oil inlet 31 to connect with the second oil outlet 33. When the pressure value fed back by the pressure sensor 60 is greater than or equal to the preset pressure threshold, the controller 70 controls the oil inlet 31 to connect with the first oil outlet 32. In this embodiment, the power equipment 40 is an adsorption machine, and its preset pressure threshold is 8 MPa. This can be flexibly adjusted according to the actual operating conditions of the solenoid valve 30 and the working status of the power equipment 40, and is not specifically limited here.

[0047] However, considering that the hydraulic control device may be affected by changes in oil temperature, oil viscosity, internal leakage and other factors during actual operation, causing fluctuations in the pressure value measured by the pressure sensor 60, in order to prevent the solenoid valve 30 from frequently starting to switch the oil path, thereby reducing damage to the solenoid valve 30, improving safety and extending the service life of the solenoid valve 30.

[0048] When the pressure value fed back by the pressure sensor 60 is greater than or equal to the first preset pressure threshold, less than the second preset pressure threshold, and the duration is greater than the preset time, the controller 70 controls the oil inlet 31 to connect with the second oil outlet 33.

[0049] When the pressure value fed back by the pressure sensor 60 is greater than or equal to a first preset pressure threshold, less than a second preset pressure threshold, and the duration is less than or equal to a preset time, the controller 70 controls the oil inlet 31 to connect with the first oil outlet 32. The first preset pressure threshold is 7 MPa, the second preset pressure threshold is 8 MPa, and the preset time is 2 seconds. Thus, by setting a 1 MPa hysteresis anti-shake range, the solenoid valve 30 maintains the connection between the oil inlet 31 and the first oil outlet 32 ​​for 2 seconds, reducing wear caused by frequent switching and improving the reliability of the solenoid valve 30's operation.

[0050] It should be noted that the first preset pressure threshold, the second preset pressure threshold, and the preset time can be flexibly adjusted according to the actual working conditions of the solenoid valve 30 and the working conditions of the power equipment 40, and no specific restrictions are imposed here.

[0051] The controller 70 is controlled by a PLC or a microcontroller. By running the preset control program within the controller 70, it processes the feedback signal from the pressure sensor 60 in real time and outputs commands to precisely control the action and switching of the solenoid valve 30. This intelligently regulates the system's oil circuit and pressure, ensuring stable operation of the power equipment 40. The controller is simple in structure, highly reliable, and allows for pressure boosting control without requiring personnel to enter the equipment.

[0052] To better manage the preset pressure threshold, the preset pressure threshold and pressure demand value of the controller 70 may not be fixed. The built-in processing system of the controller 70 has a self-learning function, continuously recording the pressure fluctuation range of the power equipment 40 during normal operation. Based on this, the controller 70 dynamically fine-tunes the preset pressure threshold and preset time to keep them at the optimal value, ensuring timely response while minimizing frequent operation of the solenoid valve 30.

[0053] Furthermore, controller 70 can be equipped with advanced diagnostic functions. For example, trend analysis can be used to continuously record the frequency and duration of pressure drops leading to the need for pressurization. If the frequency increases significantly, it may indicate wear of oil pump 20 or increased internal leakage, and controller 70 can issue a maintenance warning in advance.

[0054] In addition, the controller 70 can also perform pressure-time analysis. If the time from when the solenoid valve 30 switches to the secondary pipeline 200 until the pressure returns to the normal value is significantly longer, it may indicate that there is a fault in the booster cylinder 50 itself or related pipelines. The controller 70 can locate the potential fault point based on this.

[0055] Please refer to the reference again. Figure 4As shown, the hydraulic control device also includes a return oil line 300 and a hydraulic cylinder 80. One end of the return oil line 300 is connected to the oil outlet of the power equipment 40, and the other end is connected to the oil tank 10. The hydraulic cylinder 80 is arranged on the return oil line 300. In this way, the hydraulic oil after performing work can flow back to the oil tank 10 through the return oil line 300. The hydraulic cylinder 80 on the return oil line 300 can be used to buffer, filter, or recover energy from the return oil, ultimately constructing a highly efficient, stable, and complete hydraulic control device.

[0056] This application adds a secondary pipeline 200 and a booster cylinder 50, and uses a solenoid valve 30 to selectively connect the oil inlet 31 with the first oil outlet 32 ​​or the second oil outlet 33. When the pressure of the oil pump 20 is unstable, it can automatically switch to the secondary pipeline 200 and perform pressure boosting compensation through the booster cylinder 50. No manual intervention is required for maintenance, which improves the stability and safety of the hydraulic control device.

[0057] To improve system reliability, this application can also adopt a dual-path parallel design. That is, two identical sets of oil pumps 20, solenoid valves 30, and pressure sensors 60 are set up, one as the primary system and the other as a backup. The controller 70 continuously monitors the status of the primary system. Once a critical component (such as oil pump 20) fails and causes abnormal pressure, it can automatically switch to the backup system within milliseconds to ensure uninterrupted operation of the power equipment 40.

[0058] This application also discloses a power unit, which includes a fence (not shown) and a hydraulic control device, the hydraulic control device being placed inside the fence.

[0059] Please refer to the reference again. Figure 5 As shown, when the booster cylinder 50 is working, there is a certain safety hazard if the operator enters the enclosure without authorization. Therefore, in this embodiment, the power equipment 40 also includes an interlocking module 90. The signal input terminal of the controller 70 is connected to the interlocking module 90, and the signal output terminal of the controller 70 is connected to the solenoid valve 30. The interlocking module 90 is electrically connected to the enclosure gate lock.

[0060] When the controller 70 determines that the fence gate lock is open based on the interlocking module 90, it connects the oil inlet 31 of the control solenoid valve 30 with the first oil outlet 32. In this way, the safety risks that the equipment may bring when maintenance personnel accidentally enter the dangerous area are fundamentally eliminated, the failure rate is reduced to 0, and "personnel and danger are separated".

[0061] To further enhance the operational safety of the power equipment 40, the interlocking module 90 can also be integrated with safety light curtains, emergency stop buttons, etc. Any action that triggers the safety equipment will send a highest-priority interrupt signal to the controller 70, which will immediately switch the system to a safe state (depressurization or shutdown).

[0062] In another embodiment, when maintenance personnel need to enter the fence, they must not only unlock the gate but also enter a password or swipe a card at an authorized terminal outside the fence and press the "Maintenance Confirmation" button. The controller 70 will only deactivate the boost mode and illuminate the "Safe Entry" indicator light after receiving all these signals to avoid the risk of accidental gate opening.

[0063] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A hydraulic control device, characterized in that, It includes an oil tank, an oil pump, a solenoid valve, a power unit, and a booster cylinder; the oil tank, the oil pump, the solenoid valve, and the power unit are connected sequentially through a main pipeline; the solenoid valve is provided with an oil inlet, a first oil outlet, and a second oil outlet; the oil inlet is connected to the oil pump, the first oil outlet is connected to the power unit through the main pipeline, the second oil outlet is connected to the power unit through a secondary pipeline, and the booster cylinder is arranged on the secondary pipeline; The oil inlet may optionally be connected to either the first oil outlet or the second oil outlet.

2. The hydraulic control device according to claim 1, characterized in that, The solenoid valve is a two-position four-way valve; the oil inlet includes a first oil inlet and a second oil inlet, the first oil inlet is connected to the first oil outlet, and the second oil inlet is connected to the second oil outlet. The solenoid valve can selectively connect the first oil inlet and the first oil outlet, or connect the second oil inlet and the second oil outlet.

3. The hydraulic control device according to claim 1, characterized in that, It also includes a pressure sensor and a controller. The pressure sensor is located at the oil outlet of the oil pump. The signal input terminal of the controller is connected to the pressure sensor, and the signal output terminal of the controller is connected to the solenoid valve. The controller controls the oil inlet to be connected to the first oil outlet or the second oil outlet according to the pressure detected by the pressure sensor.

4. The hydraulic control device according to claim 3, characterized in that, When the pressure value fed back by the pressure sensor is less than a preset pressure threshold, the controller controls the oil inlet to connect with the second oil outlet; when the pressure value fed back by the pressure sensor is greater than or equal to the preset pressure threshold, the controller controls the oil inlet to connect with the first oil outlet.

5. The hydraulic control device according to claim 3, characterized in that, When the pressure value fed back by the pressure sensor is greater than or equal to a first preset pressure threshold, less than a second preset pressure threshold, and the duration is greater than a preset time, the controller controls the oil inlet to connect with the second oil outlet. When the pressure value fed back by the pressure sensor is greater than or equal to a first preset pressure threshold, less than a second preset pressure threshold, and the duration is less than or equal to a preset time, the controller controls the oil inlet to connect with the first oil outlet.

6. The hydraulic control device according to claim 5, characterized in that, The first preset pressure threshold is 7 MPa, the second preset pressure threshold is 8 MPa, and the preset time is 2 seconds.

7. The hydraulic control device according to claim 3, characterized in that, The controller is controlled by a PLC or a microcontroller.

8. The hydraulic control device according to claim 1, characterized in that, It also includes a return oil pipeline and a hydraulic cylinder. One end of the return oil pipeline is connected to the oil outlet of the power equipment, and the other end is connected to the oil tank. The hydraulic cylinder is arranged on the return oil pipeline.

9. A power unit, characterized in that, It includes a fence and a hydraulic control device according to any one of claims 1-8, wherein the hydraulic control device is placed inside the fence.

10. The power unit according to claim 9, characterized in that, It also includes an interlocking module, and the hydraulic control device further includes a controller. The signal input terminal of the controller is connected to the interlocking module, and the signal output terminal of the controller is connected to the solenoid valve. The interlocking module is electrically connected to the fence gate lock. When the controller determines that the fence gate lock is open based on the interlocking module, it controls the oil inlet of the solenoid valve to connect with the first oil outlet.

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