Control method for pure water or high water base hydraulic proportional directional valve of engineering machinery

Abstract

The invention discloses a method for controlling a hydraulic proportional reversing valve under pure water or high-water-base medium of engineering machinery, which uses an electric push rod (also called as a push rod motor, a linear push rod motor, an electric cylinder, an electric cylinder and the like, hereinafter collectively called as an electric push rod) as a driving part of the reversing valve, and the push rod is connected with and drives a valve core of the reversing valve to act; and the rotary motion of the motor is converted into the linear motion of the valve core. Meanwhile, the structure of the valve element of the reversing valve is improved, and in the movement process of the valve element, the through-flow area of a valve port is in different corresponding relations along with the displacement of the valve element in a valve element transition area located at the connecting part of a convex shoulder and a groove of the valve element. When the transition area of the valve element is of the bevel angle structure, the through-flow area of the valve port can be changed proportionally along with the displacement of the valve element. The pure water or high-water-base hydraulic proportional reversing valve can be applied to engineering machinery, the cost of the engineering machinery proportional reversing valve is reduced, and the pure water or high-water-base hydraulic proportional reversing valve has wide application prospects.

Description

Technical Field

[0001] The invention belongs to the field of pure water or high water-based hydraulic proportional control valves, and relates to a control method for a pure water or high water-based hydraulic proportional reversing valve of an engineering machinery. Background Art

[0002] In the field of fluid transmission, water hydraulic technology is a hot research topic in the future. Compared with the adverse impact of leakage on the environment caused by traditional oil-based systems, the cleanliness and flame retardant characteristics of water hydraulic technology are more environmentally friendly. However, there are still some difficulties in using water as a transmission medium. The main manifestation is that the viscosity of water is not as high as that of oil, which makes it difficult to ensure the sealing performance of water hydraulic components and easily causes gap leakage. In addition, the low viscosity and low lubricity of water can easily corrode materials and cause failure of hydraulic components.

[0003] In recent years, with the research and development of related fields such as engineering materials, lubrication theory and advanced manufacturing, some difficulties in water hydraulic transmission technology have been overcome. For example, the utility model patent "A slide valve type hydraulic reversing valve with a special sealing valve core structure" CN215444565U discloses a slide valve type reversing valve structure suitable for high-pressure and large-flow pure water or high-water-based media, which improves the sealing reliability of pure water or high-water-based slide valve type reversing valves through special sealing rings. This structure adopts an electro-hydraulic control method to realize the switching of pure water or high-water-based slide valve type reversing valves, but because the flow rate cannot be adjusted, the hydraulic cylinder cannot be accurately positioned, which limits the application field of pure water or high-water-based slide valve type reversing valves.

[0004] Based on the problems existing in the practical application of the above-mentioned pure water or high water-based slide valve type reversing valve, it is necessary to explore the proportional reversing of the pure water or high water-based slide valve type reversing valve. At present, the control method of the engineering machinery slide valve oil-based hydraulic proportional reversing valve usually involves a proportional electromagnet. The proportional electromagnet can adjust the position of the valve core according to the input electrical signal, thereby controlling the flow and direction of the fluid, and is widely used in oil hydraulic proportional reversing valves. However, for the above-mentioned reversing valve structure, the proportional electromagnet cannot be directly used as the driving component of the valve core. The main reason is that the presence of the sealing ring in the reversing valve structure increases the resistance to the movement of the valve core, and the limited thrust of the electromagnet cannot offset the effect of the resistance. Therefore, it is necessary to explore the control method of the pure water or high water-based hydraulic proportional reversing valve of engineering machinery. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a control method for a pure water or high water-based hydraulic proportional reversing valve, using an electric push rod as a reversing valve driving component, and improving the structure of the reversing valve core. The method is simple, efficient, flexible and reliable, and can realize the application of a slide valve type pure water or high water-based proportional reversing valve in engineering machinery, reduce the operating cost of engineering machinery, and meet the needs of different working conditions.

[0006] The technical solution of the present invention is as follows:

[0007] A control method for a pure water or high water-based hydraulic proportional reversing valve of an engineering machinery mainly includes a reversing valve body and a control part, characterized in that: the reversing valve body includes a left valve cover, a valve body, a valve core, and a right valve cover, the valve body contains a valve cavity and a flow hole for inlet and outlet of liquid, the valve core is coaxially installed in the valve cavity inside the valve body, the control part is an electric push rod, the electric push rod is installed on either the left or right side of the reversing valve body, and the push rod realizes linear motion under the control of a motor. The motor push rod is not limited to any push rod that can perform linear motion, including a motor push rod, an electromagnet push rod, a hydraulic push rod, etc.

[0008] Specifically, the electric push rod is connected to the valve core and drives the valve core to perform linear reciprocating motion in the valve cavity.

[0009] Specifically, the valve core is a rotating body structure, including a convex shoulder and a concave groove. The part where the convex shoulder and the concave groove are connected is called a transition area, and the flow area formed between the transition area of ​​the valve core and the flow hole of the valve body is called a valve port. The valve port opening is controlled by controlling the displacement of the valve core, and the corresponding relationship between the flow area of ​​the valve port and the displacement of the valve core is changed by changing the shape and size of the transition area. The valve port is not limited to the area between the liquid supply port and the working port, but can also be between the working port and the liquid return port.

[0010] Specifically, the valve core transition area includes any combination of an arc structure, an oblique angle structure, and a right-angle structure, wherein the oblique angle structure is an inclined transition with a slope k (|k|≠0), and the right-angle structure is a vertical transition perpendicular to the valve core axis.

[0011] Specifically, the angled structure in the valve core transition region may also be replaced by a wavy structure or a stepped structure, thereby forming a wavy valve core transition region or a stepped valve core transition region, as well as other structures based on different control effects.

[0012] Specifically, the center position function of the valve core can be Y-type, H-type, O-type, P-type, etc. by setting the number and size of the valve core bosses.

[0013] Specifically, when the valve core is in the middle position, under the action of the outer circle generatrix of the valve core shoulder and the sealing member, the valve body liquid inlet is not connected to any working port, and the reversing valve is in a closed state.

[0014] Specifically, when the electric push rod is turned on, the valve core of the reversing valve starts to move. After the reversing valve is opened, the valve opening can show different changing trends with the displacement of the valve core based on the different shapes and sizes of the transition area (such as Fig.17 , 18 , as shown in 19).

[0015] Specifically, the proportional valve structure can be applied to a two-position two-way proportional directional valve structure, a two-position three-way proportional directional valve structure, a two-position four-way proportional directional valve structure, a three-position four-way proportional directional valve structure, etc.

[0016] The beneficial effects brought about by the technical solution of the present invention are as follows:

[0017] It can realize proportional control of water-based reversing valves in construction machinery. The use of pure water or high water-based media can reduce the operating costs of construction machinery. In extreme cases when the working medium leaks, it is more environmentally friendly and meets the requirements of environmental protection and green and sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 , Figure 2 , Figure 3 This is a schematic diagram of the assembly of the electric push rod and the reversing valve body, in which 2, 3, 4, and 5 constitute the reversing valve body;

[0019] Figure 4 It is composed of the valve core structure of the reversing valve;

[0020] Figures 5 to 10 Any combination of transition structures of the valve core of the reversing valve;

[0021] Fig.11 The position relationship between the valve core and the liquid inlet and working port of the valve body when the valve core is in the middle position, that is, x=0;

[0022] Fig.12 The position relationship between the valve core and the liquid inlet and working port of the valve body when the valve core is in the right position, that is, x>0;

[0023] Fig.13 The position relationship between the valve core and the liquid inlet and working port of the valve body when the valve core is in the left position, that is, x < 0;

[0024] Fig.14 It is a schematic diagram of the position relationship between the valve core and the valve body when the valve core transition area is an angled structure combined with other structures;

[0025] Fig.15 It is a schematic diagram of the position relationship between the valve core and the valve body when the valve core transition area is a wave-shaped structure combined with other structures;

[0026] Fig.16 It is a schematic diagram of the position relationship between the valve core and the valve body when the valve core transition area is a stepped structure combined with other structures;

[0027] Fig.17When the transition area of ​​the valve core is an angled structure combined with other structures, the flow area S of the reversing valve changes with the displacement x of the valve core (the positive and negative values ​​of the flow area S in the figure only represent the flow direction, not the size. When the flow area S is positive, it means that the liquid flows from port P to port B, and when the flow area is negative, it means that the liquid flows from port P to port A, and the same applies to the following);

[0028] Fig.18 When the transition area of ​​the valve core is a wave-like structure combined with other structures, the flow area S of the reversing valve changes with the valve core displacement x;

[0029] Fig.19 When the valve core transition area is a stepped structure combined with other structures, the flow area S of the reversing valve changes with the valve core displacement x.

[0030] In the figure:

[0031] 1 electric push rod;

[0032] 2 left valve cover;

[0033] 3 valve body;

[0034] 4 valve core;

[0035] 5Right side valve cover;

[0036] 6. Valve core shoulder;

[0037] 7. Valve core groove;

[0038] 8 valve core transition area;

[0039] 8-1 arc structure, 8-2 oblique angle structure, 8-3 right angle structure;

[0040] 9. Wave-shaped valve core transition area;

[0041] 10 Stepped valve core transition area. DETAILED DESCRIPTION

[0042] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings.

[0043] Embodiment 1: The transition area of ​​the valve core is any combination of an angled structure and other structures.

[0044] A control method for a pure water or high-water-based hydraulic proportional reversing valve of an engineering machinery mainly comprises a reversing valve body and a control part, and is characterized in that: the reversing valve body comprises a left valve cover (2), a valve body (3), a valve core (4), and a right valve cover (5), the interior of the valve body comprises a valve cavity and flow holes for inlet and outlet liquids, the valve core (4) is coaxially installed in the valve cavity inside the valve body, and the control part is an electric push rod (1), which is installed on either the left or right side of the reversing valve body, and the push rod realizes linear motion under the control of a motor.

[0045] Specifically, the valve core (4) is a rotating body structure, comprising a convex shoulder (6) and a concave groove (7). The portion where the convex shoulder (6) and the concave groove (7) are connected is called a transition area (8), and the flow area formed between the transition area of ​​the valve core and the flow hole of the valve body is called a valve port. The valve port opening is controlled by controlling the displacement of the valve core, and the corresponding relationship between the flow area of ​​the valve port and the displacement of the valve core is changed by changing the shape and size of the transition area.

[0046] Specifically, the electric push rod (1) is connected to the valve core (4) to drive the valve core to perform linear reciprocating motion in the valve cavity.

[0047] Specifically, the valve core transition area (8) includes any combination of arc structure, oblique angle structure and right angle structure, which can be formed as follows: Figures 5 to 10 The combination shown in FIG. The oblique angle structure is an inclined transition with a slope of k (|k|≠0), and the right-angle structure is a vertical transition perpendicular to the valve core axis.

[0048] For details, see Fig.14 When the valve core is in the middle position, under the action of the outer circle busbar of the valve core shoulder and the seal, the valve body liquid inlet is not connected to any working port, and the reversing valve is in a closed state. When the electric push rod is started and the valve core is driven to move rightward until the liquid inlet P is connected to the working port B, the liquid enters the B port through the P port; when the valve core is driven to move leftward until the liquid inlet P is connected to the working port A, the liquid enters the A port through the P port. After the reversing valve is opened, due to the existence of the valve core transition area (8), the valve port opening changes linearly with the displacement of the valve core, see Fig.17 , thereby achieving proportional control of the reversing valve flow rate.

[0049] Embodiment 2: The transition area of ​​the valve core is any combination of a wave-like structure and other structures.

[0050] A control method for a pure water or high-water-based hydraulic proportional reversing valve of an engineering machinery mainly comprises a reversing valve body and a control part, and is characterized in that: the reversing valve body comprises a left valve cover (2), a valve body (3), a valve core (4), and a right valve cover (5), the interior of the valve body comprises a valve cavity and flow holes for inlet and outlet liquids, the valve core (4) is coaxially installed in the valve cavity inside the valve body, and the control part is an electric push rod (1), which is installed on either the left or right side of the reversing valve body, and the push rod realizes linear motion under the control of a motor.

[0051] For details, see Fig.15The valve core (4) is a rotating body structure, comprising a convex shoulder (6) and a concave groove (7). The portion where the convex shoulder (6) and the concave groove (7) are connected is called a wave-shaped transition area (9). The flow area formed between the transition area of ​​the valve core and the flow hole of the valve body is called a valve port. The valve port opening is controlled by controlling the displacement of the valve core, and the corresponding relationship between the flow area of ​​the valve port and the displacement of the valve core is changed by changing the shape and size of the transition area.

[0052] Specifically, the electric push rod (1) is connected to the valve core (4) to drive the valve core to perform linear reciprocating motion in the valve cavity.

[0053] Specifically, the wavy valve core transition area (9) comprises any combination of a circular arc structure, a wavy structure, and a right-angle structure.

[0054] For details, see Fig.15 When the valve core is in the middle position, under the action of the outer circle busbar of the valve core shoulder and the seal, the valve body liquid inlet is not connected to any working port, and the reversing valve is in a closed state. When the electric push rod is started, the valve core is driven to move to the right until the liquid inlet P is connected to the working port B, and the liquid enters the B port through the P port. When the electric push rod is started, the valve core is driven to move to the left until the liquid inlet P is connected to the working port A, and the liquid enters the A port through the P port. After the reversing valve is opened, due to the existence of the wavy valve core transition area (9), the valve port opening changes in a wavy manner with the displacement of the valve core, see Fig.18 .

[0055] Embodiment 3: The transition area of ​​the valve core is any combination of a stepped structure and other structures.

[0056] A control method for a pure water or high-water-based hydraulic proportional reversing valve of an engineering machinery mainly comprises a reversing valve body and a control part, and is characterized in that: the reversing valve body comprises a left valve cover (2), a valve body (3), a valve core (4), and a right valve cover (5), the interior of the valve body comprises a valve cavity and flow holes for inlet and outlet liquids, the valve core (4) is coaxially installed in the valve cavity inside the valve body, and the control part is an electric push rod (1), which is installed on either the left or right side of the reversing valve body, and the push rod realizes linear motion under the control of a motor.

[0057] Specifically, the valve core (4) is a rotating body structure, comprising a convex shoulder (6) and a concave groove (7), the portion where the convex shoulder and the concave groove are connected is called a stepped transition area (10), and the flow area formed between the transition area of ​​the valve core and the flow hole of the valve body is called a valve port. The valve port opening is controlled by controlling the displacement of the valve core, and the corresponding relationship between the flow area of ​​the valve port and the displacement of the valve core is changed by changing the shape and size of the transition area.

[0058] Specifically, the electric push rod (1) is connected to the valve core (4) to drive the valve core to perform linear reciprocating motion in the valve cavity.

[0059] Specifically, the stepped valve core transition region (10) comprises any combination of a circular arc structure, a stepped structure, and a right-angle structure.

[0060] For details, see Fig.16 When the valve core is in the middle position, under the action of the outer circle busbar of the valve core shoulder and the seal, the valve body liquid inlet is not connected to any working port, and the reversing valve is in a closed state. When the electric push rod is started, the valve core is driven to move rightward until the liquid inlet P is connected to the working port B, and the liquid enters the B port through the P port; when the valve core is driven to move leftward until the liquid inlet P is connected to the working port A, the liquid enters the A port through the P port. After the reversing valve is opened, due to the presence of the stepped valve core transition area (10), the valve port opening changes in a stepped manner with the displacement of the valve core, see Fig.19 .

[0061] Embodiment 4:

[0062] The proportional valve structure can be applied to a two-position two-way proportional directional valve structure, a two-position three-way proportional directional valve structure, a two-position four-way proportional directional valve structure, a three-position four-way proportional directional valve structure, etc.

Claims

1. A control method for a pure water or high water-based hydraulic proportional reversing valve of an engineering machinery, mainly comprising a reversing valve body and a control part, characterized in that: The reversing valve body comprises a left valve cover (2), a valve body (3), a valve core (4), and a right valve cover (5). The valve body contains a valve cavity and a flow hole for liquid inlet and outlet. The valve core (4) is coaxially installed in the valve cavity inside the valve body. The control part is an electric push rod (1). The electric push rod (1) is installed on either the left or right side of the reversing valve body. The push rod realizes linear motion under the control of a motor.

2. A control method for a pure water or high water-based hydraulic proportional reversing valve for engineering machinery according to claim 1, characterized in that: The electric push rod (1) is connected to the valve core (4) and drives the valve core (4) to perform linear reciprocating motion in the valve cavity.

3. A method for controlling a pure water or high water-based hydraulic proportional reversing valve for engineering machinery according to claim 1, characterized in that: The valve core (4) is a rotating body structure, comprising two parts, a convex shoulder (6) and a concave groove (7). The part where the convex shoulder (6) and the concave groove (7) are connected is called the valve core transition area (8). The flow area formed between the valve core transition area (8) and the concave groove (7) and the flow hole of the valve body is called the valve port. The valve port opening is controlled by controlling the displacement of the valve core, and the corresponding relationship between the valve port flow area and the valve core displacement is changed by changing the shape and size of the valve core transition area (8).

4. A method for controlling a pure water or high water-based hydraulic proportional reversing valve for engineering machinery according to claim 1 or 3, characterized in that: The valve core transition area (8) includes any combination of an arc structure (8-1), an oblique angle structure (8-2), and a right-angle structure (8-3), wherein the oblique angle structure (8-2) is an inclined transition with a slope k (|k|≠0), and the right-angle structure (8-3) is a vertical transition perpendicular to the valve core axis.

5. A control method for a pure water or high water-based hydraulic proportional reversing valve for engineering machinery according to claim 1 or 3, characterized in that: The angled structure (8-2) in the valve core transition region (8) may also be replaced by a wavy structure or a stepped structure, thereby forming a wavy valve core transition region (9) or a stepped valve core transition region (10), as well as other structures based on different control effects.

6. A method for controlling a pure water or high water-based hydraulic proportional reversing valve for engineering machinery according to claim 1 or 3, characterized in that: By setting the number and size of the valve core boss (6), the mid-position function of the valve core can be Y-type, H-type, O-type, P-type, etc.

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