A pressure feedback-based automatic adjustment balancing valve and its working method

Abstract

A pressure feedback-based automatic adjustment balancing valve and its operating method relate to the field of hydraulic technology. The valve comprises a valve body and a balancing valve assembly; the valve body is provided with a main orifice, a load chamber oil port, and an oil source port; the load chamber oil port and the oil source port are respectively connected to the main orifice; the valve body is provided with a pilot oil inlet orifice and a pilot oil return orifice; the pilot oil return orifice is connected to the main orifice; the balancing valve assembly is disposed within the main orifice to control the on / off switching of the load chamber oil port and the oil source port; the valve body is provided with a pilot oil inlet pressure sensor, a proportional driver, and a load port pressure sensor. The present invention can achieve certain control based on the pilot oil pressure and also amplify or reduce the efficiency of the pilot oil according to the load port pressure, thereby achieving relative compatibility between energy consumption and stability.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic technology, and in particular to an automatic regulating balancing valve based on pressure feedback and a working method thereof. Background Art

[0002] Motors require different pressure and flow rates at different stages of operation or under varying loads, resulting in varying requirements for the pilot ratio of the counterbalance valve. Generally speaking, smooth operation is required at the beginning and end of a device's operation to prevent shock and vibration. A certain speed is required during the middle phase to ensure efficiency. Therefore, a smaller pilot ratio is preferred at the beginning and end of the operation, while a larger pilot ratio is preferred during the middle phase. Generally speaking, the pilot ratio requirement increases as the load pressure increases during device operation. When the device requires stable operation and the load pressure is high, the pilot ratio should be adjusted to a medium-low range, while when the load pressure is low, the pilot ratio should be as small as possible. When the device requires rapid operation and the load pressure is high, the pilot ratio should be adjusted to a medium-high range, while when the load pressure is low, the pilot ratio should be adjusted to a medium-low range. Currently, counterbalance valves for motors typically have a fixed pilot ratio. Using a higher pilot ratio can easily cause vibration, compromising safe operation. Using a counterbalance valve with a smaller pilot ratio within an acceptable range requires higher control pressure to open the valve, resulting in higher energy consumption.

[0003] When a multi-stage hydraulic cylinder is operating, different cylinders have different force-bearing areas. The first-stage cylinder has the largest effective piston area, while the last-stage cylinder has the smallest. Generally speaking, the first-stage cylinder moves slower, while the last-stage cylinder moves faster. The speed difference increases with the number of stages. If the first-stage cylinder is operating at normal speed, the last-stage cylinder may be too fast, causing unsafe conditions such as impact and vibration. If the last-stage cylinder is operating at normal speed, the first-stage cylinder may be too slow, affecting operational efficiency.

[0004] To address the above issues, a balancing valve with a variable pilot ratio is required. To achieve a variable pilot ratio, existing patent documents, such as the patented technology with publication number CN 108223493A, entitled "A balancing valve with a variable pilot ratio," provide a balancing valve with a variable pilot ratio for the purpose of "adopting a low pilot ratio in operating conditions requiring high system stability and a high pilot ratio in steady-state conditions, thereby reducing system energy consumption." This patent uses a stepped pilot control valve block, which changes the pilot ratio by changing the pilot control oil acting on different steps to change the pilot action surface area. This will produce a step change during switching, which is not conducive to the stable operation of the actuator. In addition, the accuracy and sealing requirements between different steps are high, and the processing cost is high. Summary of the Invention

[0005] In response to the above problems, the present invention provides a pressure feedback-based automatic adjustment balancing valve and its working method, which has a sophisticated structure and automatically adjusts the pilot ratio, thereby improving system operation stability and reducing energy consumption.

[0006] The technical solution of the present invention is: an automatic regulating balancing valve based on pressure feedback, comprising a valve body and a balancing valve assembly;

[0007] The valve body is provided with a main hole, a load chamber oil port and an oil source end oil port; the load chamber oil port and the oil source end oil port are respectively connected to the main hole; the valve body is provided with a pilot oil inlet hole and a pilot oil return hole that are connected; the pilot oil return hole is connected to the main hole;

[0008] The balancing valve assembly is arranged in the main hole to control the on / off of the load chamber oil port and the oil source end oil port; the valve body is provided with a pilot oil inlet pressure sensor, a proportional driver and a load port pressure sensor;

[0009] The pilot oil inlet pressure sensor is arranged in a pilot sensing hole connected to the pilot oil inlet hole, and is used to detect the pressure data of the pilot oil inlet hole;

[0010] The proportional driver includes a spring, a damping regulator, and a proportional electromagnet sequentially arranged in a proportional adjustment hole; the proportional adjustment hole passes through the pilot oil inlet hole; the damping regulator is driven by the proportional electromagnet to move horizontally in the proportional adjustment hole to control the magnitude of the damping;

[0011] The load port pressure sensor is arranged in a load sensing hole communicated with the load cavity oil port, and is used to detect load pressure data of the load cavity oil port.

[0012] Specifically, a fixed damper is provided in the pilot oil return hole.

[0013] Specifically, one end of the damping adjuster is provided with a spring cavity adapted to the spring.

[0014] Specifically, the other end of the damping adjuster is provided with a positioning slot adapted to the proportional electromagnet.

[0015] Specifically, the damping adjuster is provided with a damping adjustment port in a round-head rectangular structure.

[0016] A working method for automatically adjusting a balancing valve based on pressure feedback is performed in the following steps:

[0017] 1) During operation, the pilot oil inlet pressure sensor is used to obtain the pressure data of the pilot oil inlet hole, which is recorded as P pil ;

[0018] 2) Obtain the load pressure data of the load cavity oil port through the load port pressure sensor, which is recorded as Pc ;

[0019] 3) The data P pil and P c They are transmitted to the control module respectively, and the main chip in the control module determines P pil With P c According to the range, change the current of the proportional electromagnet, adjust the size of the damping adjustment port, and then change the pilot ratio to the target value.

[0020] Step 3) includes:

[0021] 3.1) Pilot oil pressure P pil When it is less than a (a is the critical value that can open the balancing valve when the load chamber pressure is C under the pilot ratio Kmin), the pilot ratio is controlled to the minimum value K min ;

[0022] 3.2) Pilot oil pressure P pil When it is greater than a and less than b (b is the pilot oil pressure value that can fully open the balancing valve under the Kmax pilot ratio), adjust the pilot ratio according to the following formula:

[0023]

[0024] K is the lead ratio,

[0025] P C is the load pressure of the load chamber oil port,

[0026] C is 0.7*balance valve pressure setting value,

[0027] D is 1.3*balance valve pressure setting value;

[0028] Kmin and Kmax are the inherent parameters of the balancing valve, which can achieve the minimum pilot ratio and maximum pilot ratio;

[0029] In order to make the pilot ratio rise smoothly from Kmin to Kmax in the range of load chamber pressure from C to D, the calculation coefficient is fitted according to the values of a, b, c, and d;

[0030] 3.3) Pilot oil pressure P pil When it is greater than b, the pilot ratio is adjusted to the maximum value K max .

[0031] Beneficial effects of the present invention:

[0032] The use of this control scheme can make the overall pressure of the pilot oil of the balancing valve much lower than the pilot oil pressure used by the conventional fixed low pilot ratio balancing valve.

[0033] When the pilot oil pressure is at 0-a, the pilot ratio is at its lowest state, that is, the balancing valve mainly relies on the load port pressure to open the valve core. If the pilot oil fluctuates, it has little effect on the opening and closing of the valve port of the balancing valve, making the hydraulic circuit run stably.

[0034] When the pilot oil pressure is in the ab control range, the pilot ratio is adjusted according to the load port pressure. When the load port pressure is low, a smaller pilot ratio is used to prevent the valve port from opening too wide, causing excessive flow and rapid pressure drop, which may lead to danger. When the load port pressure is high, a larger pilot ratio is used to make the balancing valve opening wider, increase the flow capacity of the balancing valve, reduce the pressure loss of the balancing valve, and reduce energy consumption.

[0035] When the pilot oil pressure reaches b, the pilot ratio is adjusted to the maximum value, the pilot oil fully opens the valve, and the load port pressure only affects the flow rate, reducing energy consumption.

[0036] The pilot oil pressure can be controlled to a certain extent, and the effectiveness of the pilot oil can be amplified or reduced according to the pressure conditions of the load port, thereby achieving relative compatibility between energy consumption and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is the main schematic diagram of the present invention,

[0038] Figure 2 It is a side structural schematic diagram of the present invention,

[0039] Figure 3 yes Figure 2 Schematic diagram of the R-direction structure,

[0040] Figure 4 yes Figure 2 Schematic diagram of the Q-direction structure,

[0041] Figure 5 It is a structural diagram of the damping regulator.

[0042] Figure 6 yes Figure 5 Schematic diagram of the structure in the A direction,

[0043] Figure 7 yes Figure 5 Top view,

[0044] Figure 8 This is a schematic diagram of the principle of the present invention.

[0045] Figure 9 It is the pilot ratio-pilot pressure-load pressure curve;

[0046] In the figure, 1 is the control module, 1-2 is the proportional driver, 1-21 is the spring, 1-22 is the damping regulator, 1-23 is the proportional solenoid, 1-3 is the load port pressure sensor, 1-221 is the positioning slot, 1-222 is the damping adjustment port, and 1-223 is the damping regulator spring chamber;

[0047] 2 is the valve body, 2-1 is the pilot oil inlet hole, 2-2 is the load chamber oil port, 2-3 is the oil source end oil port, 2-4 is the pilot oil return hole, 2-5 is the fixed damper,

[0048] 3 is a balancing valve assembly. DETAILED DESCRIPTION

[0049] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0050] In the description of the present invention, it should be understood that terms such as "upper," "lower," "left," "right," "vertical," and "horizontal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are used solely to facilitate and simplify the description of the present invention and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0051] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0052] The present invention refers to Figure 1-8 As shown;

[0053] A pressure feedback-based automatic adjustment balancing valve comprises a valve body 2 and a balancing valve assembly 3;

[0054] The valve body 2 is provided with a main orifice, a load chamber oil port 2-2, and an oil source port 2-3; the load chamber oil port 2-2 and the oil source port 2-3 are respectively connected to the main orifice; the valve body 2 is provided with a pilot oil inlet hole 2-1 and a pilot oil return hole 2-4, which are connected to each other; the pilot oil return hole 2-4 is connected to the main orifice (a small hole is provided in the flow passage between 2-1 and 2-4, which is connected to the right end face of the main orifice);

[0055] The balancing valve assembly 3 is disposed in the main hole to control the on / off state of the load chamber oil port 2-2 and the oil source end oil port 2-3. The balancing valve assembly 3 includes a balancing valve spool, a one-way valve spring seat, a one-way valve seat, a valve sleeve, a balancing valve main spring, a main spring seat, an adjusting screw, and an adjusting nut. Since the balancing valve assembly 3 is conventional in the art, its specific structure will not be described in detail in this case.

[0056] It is characterized in that the valve body is provided with a pilot oil inlet pressure sensor 1-1, a proportional driver 1-2 and a load port pressure sensor 1-3;

[0057] The pilot oil inlet pressure sensor 1-1 is arranged in a pilot sensing hole connected to the pilot oil inlet hole 2-1, and is used to detect the pressure data of the pilot oil inlet hole 2-1;

[0058] The proportional driver 1-2 includes a spring 1-21, a damping adjuster 1-22, and a proportional electromagnet 1-23, which are sequentially arranged in a proportional adjustment hole. The proportional adjustment hole extends through the pilot oil inlet hole 2-1. The proportional electromagnet 1-23 drives the damping adjuster 1-22 to move horizontally within the proportional adjustment hole to control the damping level (the damping level refers to the change in the area of the small hole formed by the elongated damping adjustment port 1-222 in the flow channel between the pilot oil inlet hole 2-1 and the pilot oil return hole 2-4 due to the movement of the damping adjuster 1-22).

[0059] By changing the current of the proportional electromagnet 1-23, the proportional electromagnet force is related to the current. The electromagnet force is compared with the force of the spring 1-21 to change the position of the damping regulator 1-22, thereby changing the damping adjustment port size of the pilot oil circuit, and then changing the pilot ratio to the target value;

[0060] The load port pressure sensor 1 - 3 is arranged in a load sensing hole connected to the load cavity oil port 2 - 2 , and is used to detect the load pressure data of the load cavity oil port 2 - 2 .

[0061] In this case, the pilot oil inlet pressure sensor 1-1, the proportional solenoid 1-23 and the load port pressure sensor 1-3 are respectively integrated on the control module 1 and communicate with the main chip model KM-2IN1 inside the control module 1. The pilot oil inlet pressure sensor 1-1 and the load port pressure sensor 1-3 transmit the 4-20ma analog pressure signal to the main chip. After calculation, the main chip controls the power amplifier chip through PWM to output the corresponding current to the proportional solenoid.

[0062] It is further defined that a fixed damper is provided in the pilot oil return hole, forming a liquid bridge with the damping at the damping adjuster 1-22, and by changing the proportional relationship between the two dampings, the pressure between the two dampings is controlled, thereby changing the pilot ratio.

[0063] It is further defined that one end of the damping adjuster 1-22 is provided with a spring chamber 1-223 adapted to the spring 1-21, for improving the stability of the spring 1-21 during expansion and contraction.

[0064] It is further defined that the other end of the damping adjuster 1-22 is provided with a positioning slot 1-221 adapted to the proportional electromagnet 1-23 to prevent the damping adjuster 1-22 from rotating.

[0065] It is further defined that the damping adjuster 1-22 is provided with a damping adjustment port 1-222 in a round-head rectangular structure for changing the damping size.

[0066] A working method of an automatic regulating balancing valve based on pressure feedback, wherein the load chamber oil port 2-2 is connected to the working oil cylinder, the oil source end oil port 2-3 is connected to the hydraulic control valve, the pilot oil inlet hole 2-1 is connected to the pilot control valve, and the pilot oil return hole 2-4 is connected to the oil tank; the steps are as follows:

[0067] 1) During operation, the pressure data of the pilot oil inlet hole 2-1 is obtained through the pilot oil inlet pressure sensor 1-1, which is recorded as P pil ;

[0068] 2) Obtain the load pressure data of the load cavity oil port 2-2 through the load port pressure sensor 1-3, which is recorded as P c ;

[0069] 3) The data P pil and P c They are transmitted to the control module 1 respectively, and the main chip in the control module 1 determines P pil With P c According to the range, change the current of the proportional electromagnet 1-23, adjust the size of the damping adjustment port 1-222, and then change the pilot ratio to the target value.

[0070] Step 3) includes:

[0071] 3.1) Pilot oil pressure P pil When it is less than a (a is the critical value that can open the balancing valve when the load chamber pressure is C under the pilot ratio Kmin), the pilot ratio is controlled to the minimum value K min ;

[0072] When P pil When the value is less than a, the proportional actuator remains stationary and no current is supplied. Hydraulic oil enters through the pilot oil inlet hole 2-1 and exits through the pilot oil return hole 2-4. Position 1-222 is a physical limit, with the minimum damping orifice and the minimum pilot ratio. This is suitable for the most stable operating conditions.

[0073] 3.2) Pilot oil pressure P pil When it is greater than a and less than b (b is the pilot oil pressure value that can fully open the balancing valve under the Kmax pilot ratio), adjust the pilot ratio according to the following formula:

[0074]

[0075] When P pil When it is greater than a and less than b, the hydraulic oil enters from the pilot oil inlet hole 2-1 and exits from the pilot oil return hole 2-4. The proportional driver 1-2 obtains the required pilot ratio according to the above formula, and determines the output current according to the required pilot ratio and the proportional relationship between the current and the pilot ratio (how much current corresponds to how much pilot ratio) obtained by the test.

[0076] K is the lead ratio,

[0077] P C is the load pressure of load chamber oil port 2-2,

[0078] C is 0.7*balance valve pressure setting value,

[0079] D is 1.3*balance valve pressure setting value;

[0080] Kmin and Kmax are the inherent parameters of the balancing valve, which can achieve the minimum pilot ratio and maximum pilot ratio;

[0081] In order to make the pilot ratio rise smoothly from Kmin to Kmax in the range of load chamber pressure from C to D, the calculation coefficient is fitted according to the values of a, b, c, and d ( It is a purely mathematical coefficient. Different pilot ratio change rates are required under different working conditions. Correspondingly, the curves under different pilot oil pressures and load pressures are also different. It is calculated by fitting based on the corresponding curves);

[0082] 3.3) Pilot oil pressure P pil When it is greater than b, the pilot ratio is adjusted to the maximum value K max.

[0083] When P pil When it is greater than b, the output current is maximum, the damping adjuster 1-22 moves to the far left, the damping hole reaches the maximum, the pilot ratio is maximum, the hydraulic oil enters from the pilot oil inlet and exits from the pilot oil return port, which is suitable for working conditions requiring maximum speed operation.

[0084] Regarding the content disclosed in this case, the following points need to be explained:

[0085] (1) The drawings of the embodiments disclosed in this case only involve the structures involved in the embodiments disclosed in this case. Other structures can refer to the general design;

[0086] (2) In the absence of conflict, the embodiments and features of the embodiments disclosed in this case may be combined with each other to form new embodiments;

[0087] The above are only specific implementation methods disclosed in this case, but the protection scope of this disclosure is not limited thereto. The protection scope disclosed in this case should be based on the protection scope of the claims.

Claims

1. A balancing valve automatically adjusted based on pressure feedback, comprising a valve body (2) and a balancing valve assembly (3); The valve body (2) is provided with a main hole, a load chamber oil port (2-2) and an oil source end oil port (2-3); the load chamber oil port (2-2) and the oil source end oil port (2-3) are respectively connected to the main hole; the valve body (2) is provided with a pilot oil inlet hole (2-1) and a pilot oil return hole (2-4) that are connected; the pilot oil return hole (2-4) is connected to the main hole; The balancing valve assembly (3) is arranged in the main hole to control the on-off of the load chamber oil port (2-2) and the oil source end oil port (2-3); it is characterized in that: A pilot oil inlet pressure sensor (1-1), a proportional driver (1-2) and a load port pressure sensor (1-3) are provided in the valve body; The pilot oil inlet pressure sensor (1-1) is arranged in a pilot sensing hole connected to the pilot oil inlet hole (2-1) and is used to detect pressure data of the pilot oil inlet hole (2-1); The proportional driver (1-2) comprises a spring (1-21), a damping regulator (1-22), and a proportional electromagnet (1-23) which are sequentially arranged in a proportional adjustment hole; the proportional adjustment hole passes through the pilot oil inlet hole (2-1); the damping regulator (1-22) is driven by the proportional electromagnet (1-23) to move horizontally in the proportional adjustment hole to control the magnitude of the damping; The load port pressure sensor (1-3) is arranged in a load sensing hole connected to the load cavity oil port (2-2) and is used to detect load pressure data of the load cavity oil port (2-2); The pilot oil inlet pressure sensor (1-1) and the load port pressure sensor (1-3) transmit analog pressure signals to the main chip of the control module (1). After calculation, the main chip controls the power amplifier chip through PWM to output the corresponding current to the proportional electromagnet (1-23).

2. The automatic regulating balancing valve based on pressure feedback according to claim 1, characterized in that: A fixed damper is provided in the pilot oil return hole.

3. The automatic regulating balancing valve based on pressure feedback according to claim 1, characterized in that: One end of the damping adjuster (1-22) is provided with a spring cavity (1-223) adapted to the spring (1-21).

4. The automatic regulating balancing valve based on pressure feedback according to claim 3 is characterized in that: The other end of the damping regulator (1-22) is provided with a positioning slot (1-221) adapted to the proportional electromagnet (1-23).

5. The automatic regulating balancing valve based on pressure feedback according to claim 3 or 4, characterized in that: The damping adjuster (1-22) is provided with a damping adjustment port (1-222) in a round-head rectangular structure.

6. A method for automatically adjusting a balancing valve based on pressure feedback according to claim 1, characterized in that: Proceed as follows: 1) During operation, the pressure data of the pilot oil inlet hole (2-1) is obtained through the pilot oil inlet pressure sensor (1-1), which is recorded as P pil ; 2) Obtain the load pressure data of the load cavity oil port (2-2) through the load port pressure sensor (1-3), which is recorded as P c ; 3) The data P pil and P c are respectively transmitted to the control module (1), and the main chip in the control module (1) determines P pil With P c According to the range, change the current of the proportional electromagnet (1-23), adjust the size of the damping adjustment port (1-222), and then change the pilot ratio to the target value.

7. The method for automatically adjusting a balancing valve based on pressure feedback according to claim 6, characterized in that: Step 3) includes: 3.1) Pilot oil pressure P pil When it is less than a, the pilot ratio is controlled to the minimum value K min , a is the min The critical value for opening the balancing valve when the pilot ratio and the load chamber pressure are C; 3.2) Pilot oil pressure P pil When it is greater than a and less than b, b is max The pilot oil pressure value that fully opens the balancing valve under the pilot ratio is calculated and adjusted according to the following formula: K is the lead ratio, P C is the load pressure of the load chamber oil port (2-2), C is 0.7*balance valve pressure setting value, D is 1.3*balance valve pressure setting value; K min and K max It is the inherent parameter of the balancing valve, that is, the minimum pilot ratio and the maximum pilot ratio achieved; α, β, γ are the values that make the pilot ratio change from K to D when the load chamber pressure is between C and D. min Smooth rise to K max The calculation coefficients are obtained by fitting the values of a, b, c, and d; 3.3) Pilot oil pressure P pil When it is greater than b, the pilot ratio is adjusted to the maximum value K max .

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