EHA integrated hydraulic supporting leg

Abstract

The utility model relates to an EHA integrated hydraulic supporting leg which comprises a hydraulic cylinder, a motor and an oil pump, the motor drives the oil pump, two ends of the oil pump are connected with a hand pump in parallel, one end of the oil pump is connected with a rodless cavity of the hydraulic cylinder through a first channel, the other end of the oil pump is connected with a rod cavity of the hydraulic cylinder through a second channel, and the oil pump is communicated with one end of a closed oil tank. The other end of the closed oil tank is communicated with a first hydraulic control one-way valve and a second hydraulic control one-way valve respectively, the first hydraulic control one-way valve and the second hydraulic control one-way valve are communicated with a first channel and a second channel respectively, a two-way overflow valve is arranged between the first channel and the second channel, and the first channel is provided with a balance valve which is communicated with the second channel through a third channel. And a first hydraulic lock and a second hydraulic lock are respectively arranged on the first channel and the second channel. According to the utility model, the control precision is higher, the efficiency is higher, the integration degree is better, the locking effect is obviously improved, and the safety and the changeable emergency capability of the whole system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic pressure, in particular to an EHA integrated hydraulic outrigger. Background Art

[0002] The EHA integrated hydraulic outrigger is a linear or rotary motion output device that integrates a motor, a hydraulic pump, a valve block, a hydraulic cylinder, an accumulator, etc. Its rotary motion is obtained by conversion through a gear rack, so only the EHA that outputs linear motion is discussed here. The basic principle of EHA is as follows: the two chambers of the hydraulic cylinder are directly connected to the two ports of the hydraulic pump. The pump output flow is adjusted by controlling the speed of the servo motor to control the speed of the hydraulic cylinder piston rod. The accumulator is used to compensate for the oil volume difference between the two chambers of the hydraulic cylinder. According to different applications, hydraulic valves with different functions can be configured between the two chambers of the hydraulic cylinder and the hydraulic pump to meet specific working conditions. From the basic principle, it can be seen that there is no valve control throttling loss in EHA. The output flow and pressure of the pump are adjusted by controlling the speed and torque of the motor, thereby achieving the purpose of controlling the speed and output force of the hydraulic cylinder piston rod. Therefore, EHA is a highly efficient electro-hydraulic composite transmission device, which is also a research hotspot in the current hydraulic field and has the ability to be applied to vehicle-mounted outriggers.

[0003] Currently, many companies at home and abroad are carrying out the design and production of EHA integration. This type of equipment is widely used in various fields and is another development direction of hydraulic transmission. Its smaller installation volume, higher efficiency, and higher precision control method are favored by users in various fields.

[0004] For example, the EHA integrated actuator launched by the foreign company Bosch Rexroth AG is mainly used in the die-casting industry, so it has a large power and volume. Rexroth currently mainly produces large electro-hydraulic actuators, which are used in die-casting and the opening and closing of gates in large hydropower stations. In addition, Moog's electro-hydraulic actuator solution is mainly used in the die-casting industry, so its power and volume are large. Moog divides the electro-hydraulic actuator into four parts: servo drive, motor pump, valve block, and hydraulic cylinder. Each part is selected according to the customer's application and then assembled. Since die-casting often has customized working conditions, its valve block circuit is more complex, and its servo pump control unit has two specifications of 49.6kW and 68.8kW, with large power and volume. Therefore, the EHA integrated hydraulic outrigger needs to further improve its integration, modularization, refinement, and energy saving, so as to effectively replace the electric cylinder in heavy-duty structures. Utility Model Content

[0005] In order to solve the problems of the prior art, the utility model provides an EHA integrated hydraulic outrigger that provides a long-term support device for vehicles (transmitter vehicles, radar vehicles, cooling vehicles, etc.), further improving the simplicity, stability, maintainability and interchangeability of the original conventional vehicle-mounted hydraulic system.

[0006] The specific technical scheme is as follows: An EHA integrated hydraulic outrigger includes a hydraulic cylinder, a motor and an oil pump. The motor drives the oil pump. Hand pumps are connected in parallel at both ends of the oil pump. One end of the oil pump is connected to the rodless chamber of the hydraulic cylinder through a first channel, and the other end of the oil pump is connected to the rod chamber of the hydraulic cylinder through a second channel. The oil pump is connected to one end of a closed oil tank, and the other end of the closed oil tank is respectively connected to the first hydraulically controlled one-way valve and the second hydraulically controlled one-way valve. The first and second hydraulically controlled one-way valves are respectively connected to the first channel and the second channel. A two-way overflow valve is provided between the first channel and the second channel. A balancing valve is provided in the first channel, and the balancing valve is connected to the second channel through a third channel. A first hydraulic lock and a second hydraulic lock are respectively provided on the first channel and the second channel. The first hydraulic lock is connected to the second channel, and the second hydraulic lock is connected to the first channel.

[0007] In some embodiments, the first hydraulic lock is located between the balancing valve and the rodless chamber, the third channel and the second channel have a connection, and the second hydraulic lock is located between the connection and the rod chamber.

[0008] In some embodiments, the balancing valve, the two-way relief valve, the first hydraulically controlled one-way valve and the second hydraulically controlled one-way valve are all cartridge-type hydraulic valves and are integrated and installed to form a valve group.

[0009] In some embodiments, the valve assembly is integrated with the closed oil tank.

[0010] In some embodiments, the first channel includes a first oil pipe, the second channel includes a second oil pipe, the first oil pipe is connected to the rodless cavity, and the second oil pipe is connected to the rod cavity.

[0011] In some embodiments, a first pressure gauge switch and a first pressure gauge are provided between the first hydraulic lock and the rodless chamber, and a second pressure gauge and a second pressure gauge switch are provided between the second hydraulic lock and the rod chamber.

[0012] In some embodiments, the flow rate of the two-way overflow valve is greater than 10 L / min, and a balancing valve is provided at the outlet.

[0013] In some embodiments, the maximum flow rate of the first hydraulically controlled one-way valve and the second hydraulically controlled one-way valve is 4 L / min.

[0014] Technical effect of the utility model: The EHA integrated hydraulic outrigger of the utility model has higher control accuracy, higher efficiency, and better integration. It adopts hydraulic double locking, which significantly improves the locking effect, adds manual function, and improves the safety and variable emergency capability of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a hydraulic system of an EHA integrated hydraulic outrigger according to an embodiment of the utility model.

[0016] Figure 2 It is a schematic diagram of an EHA integrated hydraulic outrigger according to an embodiment of the utility model.

[0017] Figure 3 This is another schematic diagram of an EHA integrated hydraulic outrigger according to an embodiment of the utility model.

[0018] Figure 4 Schematic diagram of a valve group according to an embodiment of the present utility model.

[0019] Figure 5 It is a top view of an EHA integrated hydraulic outrigger according to an embodiment of the utility model. DETAILED DESCRIPTION

[0020] The essential features and advantages of the present invention are further described below in conjunction with examples, but the present invention is not limited to the examples listed.

[0021] like Figures 1 to 5As shown, an EHA integrated hydraulic outrigger of the present embodiment includes a hydraulic cylinder 8, which drives the outrigger to move. The EHA integrated hydraulic outrigger of the present embodiment also includes a motor 1 and an oil pump 2, wherein the motor 1 drives the oil pump 2, and a hand pump 3 is connected in parallel at both ends of the oil pump 2. One end of the oil pump 2 is connected to the rodless chamber 81 of the hydraulic cylinder 8 through the first channel 10, and the other end of the oil pump 2 is connected to the rod chamber 82 of the hydraulic cylinder 8 through the second channel 20. The oil pump 2 is connected to one end of the closed oil tank 4, and the other end of the closed oil tank 4 is respectively connected to the first hydraulically controlled one-way valve 51 and the second hydraulically controlled one-way valve 52, and the first and second hydraulically controlled one-way valves are respectively connected to the first channel 10 and the second channel 20. A two-way overflow valve 6 is provided between the first channel 10 and the second channel 20. A balance valve 7 is provided on the first channel 10. The balance valve 7 is connected to the second channel 20 through the third channel 30. A first hydraulic lock 53 and a second hydraulic lock 54 are provided on the first channel 10 and the second channel 20 respectively. The first hydraulic lock 53 is connected to the second channel 20, and the second hydraulic lock 54 is connected to the first channel 10. In the above technical scheme, a servo motor drives a two-way pump to provide power for the mechanism, a closed oil tank 4 is used to store oil, and a first and a second hydraulic control one-way valve are provided on both sides of the outlet end. When the system is started, the motor 1 is powered on to drive the oil pump 2 to run, and the oil is output to the left. Pressure is established through the overflow valve 6, and the control oil flows into the second hydraulic control one-way valve 52. The second hydraulic control one-way valve 52 opens, and the oil flows back into the closed oil tank; the oil flows into the rodless chamber 81 through the first hydraulic lock 53, and the oil cylinder extends at this time. When the oil is output to the right, pressure is established through the overflow valve 6, and the oil is controlled to flow into the first hydraulically controlled one-way valve 51. The hydraulically controlled one-way valve 51 opens, and the oil flows back into the oil tank. The oil flows into the rod chamber of the oil cylinder through the second hydraulic lock 54, and the oil cylinder retracts at this time. A hand pump 3 is set in the bypass to provide a manual emergency function for the system, and complete the extension and retraction of the oil cylinder in the event of a power outage. The hand pump is equivalent to a two-way pump in the system. The power of the two-way pump comes from the motor, and the hand pump can achieve the same function only through manpower. Through the above technical solution, a motor is used to drive a two-way plunger pump to supply oil to the two chambers of the hydraulic cylinder. Through motor reversing and volume speed regulation, the control accuracy and efficiency are higher. The hydraulic cylinder is locked through the hydraulic lock and the balance valve. The hydraulic lock has extremely low leakage. In the absence of control oil, it is equivalent to a reverse-installed one-way valve, which can effectively lock the movement position of the hydraulic cylinder. The balance valve can also play a locking role through the combination of the one-way valve and the overflow valve. When the outrigger hydraulic cylinder is in the supporting state, the double locking function can improve the locking effect. At the same time, when the outrigger is retracted, the overflow valve in the balance valve can increase the back pressure of the rodless chamber of the cylinder, slow down the falling speed of the cylinder, and ensure the stable operation of the outrigger. Adding manual functions and setting hand pumps in the conventional outrigger hydraulic system improves the safety and variable emergency capabilities of the entire system.

[0022] In this embodiment, the stroke of the hydraulic cylinder is 500mm. An existing variable frequency motor is selected to drive a high-efficiency pump to achieve flow pressure output, and precision control is performed through volume speed regulation. A low-leakage hydraulic lock is set to accurately position the cylinder, thereby improving the accuracy of the original hydraulic system and ultimately achieving a control accuracy of 0.5mm for the cylinder. The pump is selected to have a capacity of 0.5cc / r, a volumetric efficiency of 90%, and a rated speed of 3720r / min.

[0023] In this embodiment, the first hydraulic lock 53 is located between the balance valve 7 and the rodless chamber 81, the third channel 30 and the second channel 20 have a connection 301, and the second hydraulic lock 54 is located between the connection 301 and the rod chamber 82. The balance valve 7, the two-way relief valve 6, the first hydraulically controlled one-way valve 51 and the second hydraulically controlled one-way valve 52 are all plug-in hydraulic valves and are integrated to form a valve group 9. The valve group 9 is integrated with the closed oil tank 4. The first channel 10 includes a first oil pipe 101, and the second channel 20 includes a second oil pipe 201. The first oil pipe 101 is connected to the rodless chamber 81, and the second oil pipe 201 is connected to the rod chamber 82. A first pressure gauge switch 91 and a first pressure gauge 92 are provided between the first hydraulic lock 53 and the rodless chamber 81, and a second pressure gauge 93 and a second pressure gauge switch 94 are provided between the second hydraulic lock 54 and the rod chamber 82 for pressure monitoring.

[0024] In this embodiment, low-noise valves are used as components, and the noise level is lower than 75db. A closed system is used in structure, and the whole system is integrated on a valve block. The flow rate of the internal channel is designed to be about 3m / s, which reduces the risk of internal howling, controls the finish of the flow channel of the processed parts, and ensures smooth transition inside the channel. The two-way relief valve uses a flow rate greater than 10L / min, and the outlet is designed with a balancing valve to eliminate the cavitation phenomenon of the actuator and the load out-of-control phenomenon, thereby reducing system noise.

[0025] The balancing valve can perform load control: the balancing valve can prevent the energy of the actuator load from causing the action before the action of the hydraulic pump, thereby eliminating the cavitation phenomenon of the actuator and the load out of control phenomenon. System protection: when the cylinder load pressure is too high, the oil can be discharged to prevent the system pressure from being too high. The selected balancing valve has an oil flow rate of 10L / min.

[0026] The overflow valve plays an overload protection role in the system. When the load pressure is higher than the set pressure, the overflow valve opens to release part of the fluid. The selected overflow valve has an oil flow rate of up to 10L / min and a noise level of less than 75db.

[0027] This embodiment uses a hydraulic lock and a balancing valve for double locking. The hydraulic lock has extremely low leakage. In the absence of control oil, it is equivalent to a reverse-installed one-way valve, which can effectively lock the movement position of the cylinder. The balancing valve can also play a locking role through the combination of a one-way valve and a relief valve. When the outrigger cylinder is in the supporting state, the double locking function can improve the locking effect, achieving a cylinder displacement of ≤0.5mm / 24h after locking. The maximum flow rate of the first hydraulically controlled one-way valve and the second hydraulically controlled one-way valve is 4L / min.

[0028] The balance valve can hold the load and prevent the hydraulic cylinder from drifting. The selected balance valve has an oil flow rate of 10L / min. The manual function is added to the conventional outrigger hydraulic system, and a hand pump is set to improve the safety and emergency response capabilities of the entire system. When hand cranking is required, the hydraulic oil is released first to remove the internal resistance. The hydraulic cylinder body and base are made of high-strength materials to improve the overall strength and thrust of the device.

[0029] An EHA integrated hydraulic outrigger in this embodiment has the following advantages:

[0030] First, the principle of the EHA integrated hydraulic outrigger configuration with high efficiency and high dynamic characteristics. Propose an innovative configuration of the electro-hydraulic compound drive actuator, study the parameter matching and coupling relationship of components such as motors / generators, pumps / motors, and hydraulic cylinders, analyze their influence on energy efficiency, dynamic characteristics, and control performance, reduce system energy consumption, improve efficiency, and improve control accuracy.

[0031] Second, the noise reduction of micro hydraulic valves uses parameter optimization and noise reduction structural measures to reduce the noise during its operation, ultimately achieving a noise level below 75db.

[0032] Third, outrigger locking: Through the analysis of mechanical locking and hydraulic locking, in order to ensure a more compact structure and reduce component risks, hydraulic double locking was finally adopted to achieve a cylinder displacement of ≤0.5mm / 24h after locking.

[0033] Fourth, a manual function is added on the basis of conventional electrical control, which is mainly used for emergency purposes. It can ensure that the equipment can still be restored to its original state through a hand pump in the event of a power outage.

[0034] Fifth, increase thrust.

[0035] Sixth, more integrated and refined.

[0036] It should be pointed out that the above preferred embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. An EHA integrated hydraulic outrigger, comprising a hydraulic cylinder, characterized in that: It also includes a motor and an oil pump. The motor drives the oil pump. Hand pumps are connected in parallel at both ends of the oil pump. One end of the oil pump is connected to the rodless chamber of the hydraulic cylinder through a first channel, and the other end of the oil pump is connected to the rod chamber of the hydraulic cylinder through a second channel. The oil pump is connected to one end of a closed oil tank, and the other end of the closed oil tank is respectively connected to the first hydraulically controlled one-way valve and the second hydraulically controlled one-way valve. The first and second hydraulically controlled one-way valves are respectively connected to the first channel and the second channel. A two-way overflow valve is provided between the first channel and the second channel. A balancing valve is provided in the first channel, and the balancing valve is connected to the second channel through a third channel. A first hydraulic lock and a second hydraulic lock are respectively provided on the first channel and the second channel. The first hydraulic lock is connected to the second channel, and the second hydraulic lock is connected to the first channel.

2. The EHA integrated hydraulic outrigger according to claim 1, characterized in that: The first hydraulic lock is located between the balance valve and the rodless chamber, the third channel and the second channel have a connection, and the second hydraulic lock is located between the connection and the rod chamber.

3. The EHA integrated hydraulic outrigger according to claim 2, characterized in that: The balancing valve, the two-way relief valve, the first hydraulically controlled one-way valve and the second hydraulically controlled one-way valve are all plug-in hydraulic valves and are integrated to form a valve group.

4. The EHA integrated hydraulic outrigger according to claim 3, characterized in that: The valve group is integrated with the closed oil tank.

5. The EHA integrated hydraulic outrigger according to claim 4, characterized in that: The first channel includes a first oil pipe, the second channel includes a second oil pipe, the first oil pipe is communicated with the rodless cavity, and the second oil pipe is communicated with the rod cavity.

6. The EHA integrated hydraulic outrigger according to claim 5, characterized in that: A first pressure gauge switch and a first pressure gauge are provided between the first hydraulic lock and the rodless chamber, and a second pressure gauge and a second pressure gauge switch are provided between the second hydraulic lock and the rod chamber.

7. The EHA integrated hydraulic outrigger according to claim 6, characterized in that: The flow rate of the two-way overflow valve is greater than 10L / min, and a balancing valve is provided at the outlet.

8. The EHA integrated hydraulic outrigger according to claim 7, characterized in that: The maximum flow rate of the first hydraulically controlled one-way valve and the second hydraulically controlled one-way valve is 4 L / min.

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