A load-holding pressure regulating hydraulic system and integrated balancing valve

Abstract

The present invention discloses a load-holding pressure regulating hydraulic system, comprising a valve body oil inlet, a valve body oil return hole, an adjusting oil hole, a proportional relief valve, and a balancing valve; the balancing valve has two working oil ports, namely port A and port B; the valve body oil inlet is connected to port A of the balancing valve, port B of the balancing valve is connected to the rodless chamber of the loading oil cylinder, and the rod chamber of the loading oil cylinder is connected to the valve body oil return hole; the adjusting oil hole is connected to the hydraulic control end of the balancing valve for controlling the working position of the balancing valve, and port A of the balancing valve is also connected to the oil inlet of the proportional relief valve; the balancing valve has two working positions, and when the balancing valve is working in the first working position, the flow from port B to port A is one-way blocked; when the balancing valve is working in the second working position, port A is connected to port B. The load-holding pressure regulating hydraulic system provided by the present invention can conveniently achieve load-holding pressure regulation and improve the reliability of experimental data.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic technology, and in particular to a load-holding pressure regulating hydraulic system. The present invention also relates to an integrated balancing valve. Background Art

[0002] Currently, when conducting simulation experiments on the load conditions of large bearings, it is usually necessary to use multiple loading cylinders to apply radial force to various circumferential positions of the test bearing.

[0003] During radial force loading, a balancing valve is typically used to maintain the load pressure of the loading cylinder. The primary functions of this balancing valve are load holding, load control under load, and safety. However, due to the nature of balancing valves, existing balancing valves cannot adjust the load holding pressure, particularly reducing it (downward), and can only maintain a stable load pressure. During actual experiments, constant adjustment of the load holding pressure is often necessary to simulate the actual load conditions of large bearings.

[0004] Therefore, how to conveniently adjust the load holding pressure and improve the reliability of experimental data is a technical problem faced by those skilled in the art. Summary of the Invention

[0005] The object of the present invention is to provide a load holding pressure regulating hydraulic system, which can conveniently achieve load holding pressure regulation and improve the reliability of experimental data. Another object of the present invention is to provide an integrated balancing valve.

[0006] In order to solve the above technical problems, the present invention provides a load holding pressure regulating hydraulic system, comprising a valve body oil inlet hole, a valve body oil return hole, an adjusting oil hole, a proportional relief valve, and a balancing valve;

[0007] The balancing valve has two working oil ports, port A and port B;

[0008] The oil inlet hole of the valve body is connected to the A port of the balancing valve, the B port of the balancing valve is connected to the rodless cavity of the loading cylinder, and the rod cavity of the loading cylinder is connected to the oil return hole of the valve body;

[0009] The regulating oil hole is connected to the hydraulic control end of the balancing valve for controlling the working position of the balancing valve. The port A of the balancing valve is also connected to the oil inlet of the proportional relief valve.

[0010] The balancing valve has two working positions, and when the balancing valve works in the first working position, the connection between its B port and its A port is one-way blocked; when the balancing valve works in the second working position, its A port and its B port are connected.

[0011] Preferably, it also includes a first controlled one-way valve, which is connected between the oil inlet hole of the valve body and the port A of the balancing valve, and is used to unidirectionally guide the oil path between the oil inlet hole of the valve body and the port A of the balancing valve.

[0012] Preferably, a second controlled one-way valve is also included, which is connected between the oil inlet of the proportional relief valve and the port A of the balancing valve, and is used to one-way cut off the oil circuit between the port A of the balancing valve and the oil inlet of the proportional relief valve.

[0013] Preferably, the first controlled one-way valve is a hydraulically controlled one-way valve, and the hydraulically controlled end of the first controlled one-way valve is communicated with the oil return hole of the valve body.

[0014] Preferably, the second controlled one-way valve is a hydraulically controlled one-way valve, and the hydraulically controlled end of the second controlled one-way valve is connected to the regulating oil hole.

[0015] Preferably, when the balancing valve is working in the second position, its port A and port B are connected through a pressure-sensitive throttle valve.

[0016] Preferably, a shuttle valve is further included, wherein the first oil inlet of the shuttle valve is connected to the oil return hole of the valve body, the second oil inlet of the shuttle valve is connected to the regulating oil hole, and the oil outlet of the shuttle valve is connected to the hydraulic control end of the balancing valve.

[0017] Preferably, it further comprises a first pressure sensor for detecting the pressure of the rodless chamber of the loading cylinder.

[0018] Preferably, a second pressure sensor is further included for detecting the pressure of the rod chamber of the loading cylinder.

[0019] The present invention also provides an integrated balancing valve, comprising a valve body and a load-holding pressure regulating hydraulic system installed on the valve body, wherein the valve body is arranged on the cylinder body of the loading cylinder, and the load-holding pressure regulating hydraulic system is specifically the load-holding pressure regulating hydraulic system described in any one of the above items.

[0020] The load holding pressure regulating hydraulic system provided by the present invention mainly includes a valve body oil inlet hole, a valve body oil return hole, an adjusting oil hole, a proportional relief valve and a balancing valve. Among them, the balancing valve has two working oil ports, namely port A and port B, and the balancing valve also has two working positions and a hydraulic control end. The valve body oil inlet hole is provided on the valve body of the integrated balancing valve, mainly used to realize oil inlet (or oil outlet). The valve body oil return hole is also provided on the valve body of the integrated balancing valve, mainly used to realize oil outlet (or oil inlet). The adjusting oil hole is also provided on the valve body of the integrated balancing valve, mainly used to introduce adjusting oil. The valve body oil inlet hole is connected to port A of the balancing valve, the port B of the balancing valve is connected to the rodless cavity of the loading cylinder, and the cylinder cavity of the loading cylinder is connected to the valve body oil return hole. At the same time, the adjusting oil hole is connected to the hydraulic control end of the balancing valve, and adjusting oil can be introduced to control (switch) the working position state of the balancing valve. Port A of the balancing valve is also connected to the oil inlet of the proportional relief valve, so that the proportional relief valve can proportionally adjust the pressure of the oil circuit in which it is located (usually proportionally reduce it). When the balancing valve is working in the first position, the connection between its port B and its port A is one-way blocked, that is, the oil can only flow from port A to port B in one direction and cannot flow in the opposite direction. When the balancing valve is working in the second position, its port A is connected to its port B.

[0021] Thus, in the load-maintaining pressure regulating hydraulic system provided by the present invention, when the loading cylinder needs to apply radial pressure to the bearing, the balancing valve operates in the first position, and no regulating oil is introduced into the regulating oil hole. At this time, pressure oil enters from the oil inlet hole of the valve body and enters the rodless cavity of the loading cylinder through ports A and B of the balancing valve, causing the loading cylinder to extend and apply pressure to the bearing. When the loading pressure reaches the expected value, the pressure oil supply stops. Since the balancing valve port B to its port A is one-way blocked, the oil cannot flow back, thereby maintaining the current load pressure of the rodless cavity of the loading cylinder.

[0022] When it is necessary to adjust (mainly lower) the load pressure of the loading cylinder, first set the proportional adjustment parameters of the proportional relief valve according to the target adjustment pressure, then introduce the adjustment oil from the adjustment oil hole and enter the hydraulic control end of the balancing valve, so that the balancing valve switches the working position. At this time, it works in the second working position. The A port and the B port of the balancing valve are connected, and the pressure oil in the rodless chamber can pass through the balancing valve and then flow through the proportional relief valve. The proportional adjustment characteristics of the proportional relief valve are used to reduce the load holding pressure of the rodless chamber of the loading cylinder.

[0023] Therefore, the load holding pressure regulating hydraulic system provided by the present invention can conveniently realize the regulation of the load holding pressure and improve the reliability of experimental data. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0025] Figure 1 This is a system principle diagram of a specific implementation method provided by the present invention.

[0026] Figure 2 This is a physical structure diagram of a specific implementation method provided by the present invention.

[0027] in, Figure 1 — Figure 2 middle:

[0028] Valve body oil inlet hole 1, valve body oil return hole 2, regulating oil hole 3, proportional relief valve 4, balancing valve 5, loading cylinder 6, first controlled one-way valve 7, second controlled one-way valve 8, shuttle valve 9, first pressure sensor 10, second pressure sensor 11, valve body 12;

[0029] Pressure sensitive throttle valve—51. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Please refer to Figure 1 , Figure 1 This is a system principle diagram of a specific implementation method provided by the present invention.

[0032] In a specific embodiment provided by the present invention, the load holding pressure regulating hydraulic system mainly includes an oil inlet hole 1 of the valve body 12, an oil return hole 2 of the valve body 12, an adjusting oil hole 3, a proportional relief valve 4 and a balancing valve 5.

[0033] The balancing valve 5 has two working oil ports, namely port A and port B, and the balancing valve 5 also has two working positions and a hydraulic control end.

[0034] The oil inlet hole 1 of the valve body 12 is provided on the valve body 12 of the integrated balancing valve 5 and is mainly used for realizing oil inlet (or oil outlet).

[0035] The oil return hole 2 of the valve body 12 is also provided on the valve body 12 of the integrated balancing valve 5 and is mainly used for realizing oil discharge (or oil inlet).

[0036] The regulating oil hole 3 is also provided on the valve body 12 of the integrated balancing valve 5 and is mainly used for introducing regulating oil.

[0037] Oil inlet 1 of valve body 12 communicates with port A of balancing valve 5. Port B of balancing valve 5 communicates with the rodless chamber of loading cylinder 6, while the cylinder chamber of loading cylinder 6 communicates with oil return hole 2 of valve body 12. Simultaneously, regulating oil hole 3 communicates with the hydraulic control port of balancing valve 5, allowing regulating oil to be introduced to control (switch) the working position of balancing valve 5.

[0038] The port A of the balancing valve 5 is also connected to the oil inlet of the proportional relief valve 4 so that the pressure of the oil circuit in which it is located is proportionally adjusted (usually proportionally reduced) through the proportional relief valve 4.

[0039] When the balancing valve 5 is operating in the first position, the connection between its port B and its port A is one-way blocked, meaning that oil can only flow from port A to port B and cannot flow in the opposite direction. When the balancing valve 5 is operating in the second position, its port A is connected to its port B. Generally, when the hydraulic control end of the balancing valve 5 has control pressure, the operating state of the balancing valve 5 is switched to the second position, and when the hydraulic control end of the balancing valve 5 does not have control pressure, the operating state of the balancing valve 5 returns to the first position.

[0040] Thus, in the load-maintaining pressure regulating hydraulic system provided by this embodiment, when the loading cylinder 6 needs to apply radial pressure to the bearing, the balancing valve 5 operates in the first position, and no regulating oil is introduced into the regulating oil hole 3. At this time, the pressure oil enters from the oil inlet 1 of the valve body 12 and enters the rodless cavity of the loading cylinder 6 through the A and B ports of the balancing valve 5, causing the loading cylinder 6 to extend and apply pressure to the bearing. When the loading pressure reaches the expected value, the pressure oil supply stops. Since the balancing valve 5 is one-way blocked from the B port to its A port, the oil cannot flow back, thereby maintaining the current load pressure of the rodless cavity of the loading cylinder 6.

[0041] When it is necessary to adjust (mainly lower) the load pressure of the loading cylinder 6, first set the proportional adjustment parameters of the proportional relief valve 4 according to the target adjustment pressure, and then introduce the adjustment oil from the adjustment oil hole 3 and enter the hydraulic control end of the balancing valve 5, so that the balancing valve 5 switches the working position. At this time, it works in the second working position. The A port and the B port of the balancing valve 5 are connected, and the pressure oil in the rodless chamber can pass through the balancing valve 5 and then flow through the proportional relief valve 4. The proportional adjustment characteristics of the proportional relief valve 4 are used to reduce the load holding pressure of the rodless chamber of the loading cylinder 6.

[0042] In summary, the load-holding pressure regulating hydraulic system provided in this embodiment can conveniently implement the regulation of the load-holding pressure and improve the reliability of experimental data.

[0043] This embodiment also includes a first controlled one-way valve 7. This first controlled one-way valve 7 is connected between the oil inlet 1 of the valve body 12 and port A of the balancing valve 5. It primarily functions to unidirectionally guide the oil flow from the oil inlet 1 of the valve body 12 to port A of the balancing valve 5. Specifically, pressurized oil can only flow in one direction, from the oil inlet 1 of the valve body 12 to the balancing valve 5. However, the first controlled one-way valve 7 has a control terminal. When this terminal receives a control signal, the first controlled one-way valve 7 becomes bidirectionally guided.

[0044] In an optional embodiment of the first controlled one-way valve 7, the first controlled one-way valve 7 is specifically a hydraulically controlled one-way valve, which achieves bidirectional conduction control through oil pressure. The hydraulically controlled end of the first controlled one-way valve 7 is connected to the oil return port 2 of the valve body 12. When pressurized oil enters the oil return port of the valve body 12, the first controlled one-way valve 7 becomes bidirectionally conduction. At this point, the pressurized oil enters the rod chamber of the loading cylinder 6, driving the loading cylinder 6 to retract. The oil in the rodless chamber of the loading cylinder 6 rapidly passes through ports B and A of the balancing valve 5 (at this point, the balancing valve 5 is operating in the second position), then flows through the first controlled one-way valve 7 and out of the oil inlet port 1 of the valve body 12, achieving rapid pressure relief.

[0045] This embodiment also includes a second controlled one-way valve 8. This second controlled one-way valve 8 is connected between the oil inlet of the proportional relief valve 4 and port A of the balancing valve 5. It primarily serves to one-way block the oil path between port A of the balancing valve 5 and the oil inlet of the proportional relief valve 4, effectively preventing pressurized oil from flowing from port A of the balancing valve 5 to the oil inlet of the proportional relief valve 4. However, the second controlled one-way valve 8 has a control terminal. When this terminal receives a control signal, the second controlled one-way valve 8 becomes bidirectionally conductive.

[0046] In an optional embodiment of the second controlled one-way valve 8 , the second controlled one-way valve 8 is specifically a hydraulically controlled one-way valve, which achieves bidirectional conduction control via oil pressure. The hydraulically controlled end of the second controlled one-way valve 8 is connected to the regulating oil hole 3 . When regulating oil is introduced, the second controlled one-way valve 8 becomes bidirectionally conduction. At this point, the pressurized oil in the rodless chamber of the loading cylinder 6 slowly flows through ports B and A of the balancing valve 5 (at this point, the balancing valve 5 is operating in the second position), then through the second controlled one-way valve 8 and then through the proportional relief valve 4, achieving proportional regulation (reduction) of the load-maintaining pressure of the loading cylinder 6 .

[0047] Of course, the control ends of the first controlled one-way valve 7 and the second controlled one-way valve 8 are not limited to hydraulic control ends, but can also be electromagnetic control ends or mechanical control ends.

[0048] To facilitate flow control, ensuring rapid or slow flow of the pressure oil within the rodless chamber of the loading cylinder 6 through the balancing valve 5, in this embodiment, a pressure-sensitive throttle valve 51 is integrated within the second station of the balancing valve 5. Specifically, the throttle opening of the pressure-sensitive throttle valve 51 is positively correlated with the control pressure at the hydraulic control end of the balancing valve 5. When the control pressure increases, the throttle opening increases, resulting in a faster flow rate and a larger flow rate. Conversely, when the control pressure decreases, the throttle opening decreases, resulting in a slower flow rate and a smaller flow rate. With this arrangement, when the relatively low-pressure regulating oil enters the hydraulic control end of the balancing valve 5 from the regulating oil hole 3, the throttle opening of the pressure-sensitive throttle valve 51 is relatively small, causing the load-holding pressure of the loading cylinder 6 to slowly decrease. However, when the relatively high-pressure pressure oil enters the hydraulic control end of the balancing valve 5 from the oil return hole 2 of the valve body 12, the throttle opening of the pressure-sensitive throttle valve 51 is relatively large, causing the loading cylinder 6 to rapidly depressurize.

[0049] Furthermore, to facilitate the selective communication of the two aforementioned pressures with the hydraulically controlled end of the balancing valve 5, a shuttle valve 9 is added in this embodiment. Specifically, the shuttle valve 9 has two oil inlets and one oil outlet. The first oil inlet communicates with the oil return hole 2 of the valve body 12, the second oil inlet communicates with the regulating oil hole 3, and the oil outlet communicates with the hydraulically controlled end of the balancing valve 5. This arrangement, utilizing the shuttle valve 9's ability to selectively control the oil inlet pressure, conveniently allows different control pressures to be applied to the hydraulically controlled end of the balancing valve 5.

[0050] To accurately monitor the load-holding pressure and associated oil circuit pressure, this embodiment incorporates a first pressure sensor 10 and a second pressure sensor 11. The first pressure sensor 10 primarily detects the pressure in the rodless chamber of the loading cylinder 6, accurately measuring the load-holding pressure of the loading cylinder 6. The second pressure sensor 11 primarily detects the pressure in the rod chamber of the loading cylinder 6. Working in tandem, the first and second pressure sensors 10, 11 enable online acquisition of system pressure parameters for precise control.

[0051] Please refer to Figure 2 , Figure 2 This is a physical structure diagram of a specific implementation method provided by the present invention.

[0052] This embodiment also provides an integrated balancing valve 5, which mainly includes a valve body 12 and a load-holding pressure regulating hydraulic system installed on the valve body 12, wherein the valve body 12 is integrated on the cylinder body of the loading cylinder 6 to achieve a compact structural design, and the specific content of the load-holding pressure regulating hydraulic system is referred to the above content and will not be repeated here.

[0053] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A load holding pressure regulating hydraulic system, characterized in that: It includes a valve body oil inlet hole (1), a valve body oil return hole (2), an adjustment oil hole (3), a proportional relief valve (4), and a balancing valve (5); The balancing valve (5) has two working oil ports, namely port A and port B; The oil inlet hole (1) of the valve body is communicated with the A port of the balancing valve (5), the B port of the balancing valve (5) is communicated with the rodless cavity of the loading oil cylinder (6), and the rod cavity of the loading oil cylinder (6) is communicated with the oil return hole (2) of the valve body; and further comprises a first controlled one-way valve (7), which is communicated between the oil inlet hole (1) of the valve body and the A port of the balancing valve (5) and is used for unidirectionally conducting the oil path between the oil inlet hole (1) of the valve body and the A port of the balancing valve (5); The regulating oil hole (3) is connected to the hydraulic control end of the balancing valve (5) for controlling the working position of the balancing valve (5). The port A of the balancing valve (5) is also connected to the oil inlet of the proportional relief valve (4). The balancing valve (5) has two working positions, and when the balancing valve (5) is working in the first working position, the connection between its B port and its A port is one-way cutoff; when the balancing valve (5) is working in the second working position, its A port is connected to its B port.

2. The load holding pressure regulating hydraulic system according to claim 1, characterized in that: The invention also includes a second controlled one-way valve (8), which is connected between the oil inlet of the proportional relief valve (4) and the port A of the balancing valve (5) and is used for one-way blocking the oil path between the port A of the balancing valve (5) and the oil inlet of the proportional relief valve (4).

3. The load holding pressure regulating hydraulic system according to claim 2, characterized in that: The first controlled one-way valve (7) is a hydraulically controlled one-way valve, and the hydraulically controlled end of the first controlled one-way valve (7) is in communication with the oil return hole (2) of the valve body.

4. The load holding pressure regulating hydraulic system according to claim 3, characterized in that: The second controlled one-way valve (8) is a hydraulically controlled one-way valve, and the hydraulically controlled end of the second controlled one-way valve (8) is in communication with the regulating oil hole (3).

5. The load holding pressure regulating hydraulic system according to claim 4, characterized in that: When the balancing valve (5) operates in the second position, its port A and port B are connected via the pressure-sensitive throttle valve (51).

6. The load holding pressure regulating hydraulic system according to claim 1, characterized in that: It also includes a shuttle valve (9), wherein a first oil inlet of the shuttle valve (9) is connected to the oil return hole (2) of the valve body, a second oil inlet of the shuttle valve (9) is connected to the regulating oil hole (3), and an oil outlet of the shuttle valve (9) is connected to the hydraulic control end of the balancing valve (5).

7. The load holding pressure regulating hydraulic system according to claim 1, characterized in that: It also includes a first pressure sensor (10) for detecting the pressure of the rodless chamber of the loading cylinder (6).

8. The load holding pressure regulating hydraulic system according to claim 7, characterized in that: It also includes a second pressure sensor (11) for detecting the pressure of the rod chamber of the loading cylinder (6).

9. An integrated balancing valve, comprising a valve body (12) and a load-holding pressure regulating hydraulic system mounted on the valve body (12), characterized in that: The valve body (12) is arranged on the cylinder body of the loading cylinder (6), and the load-holding pressure regulating hydraulic system is specifically the load-holding pressure regulating hydraulic system according to any one of claims 1 to 8.

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