Four-position five-way hydraulic reversing valve

Abstract

A four-position five-way hydraulic reversing valve comprises a valve body 11 and a valve element 12, the valve body 11 is provided with a hole in sliding fit with the valve element 12, and the valve body 11 is provided with an oil cavity P, an oil cavity T, an oil cavity A and an oil cavity B. The four-position five-way hydraulic reversing valve is characterized in that the valve body 11 is further provided with an oil cavity A1, and the total number of the oil cavities reaches five; and the valve core 12 axially moves in a hole of the valve body 11 to form four working positions. According to the four-position five-way hydraulic reversing valve, the number of oil cavities and working positions of the hydraulic reversing valve are increased, the function of the hydraulic reversing valve is expanded, the function achieved by combining several traditional reversing valves can be replaced, for example, a hydraulic machine child-mother hydraulic cylinder control loop can be achieved, control can be completed only through one four-position five-way hydraulic reversing valve, and the cost is reduced. Therefore, the structure of the hydraulic system is simplified, and the overall manufacturing cost is reduced.

Description

Technical Field

[0001] The invention belongs to the field of hydraulic control, and in particular relates to a hydraulic reversing valve. Background Art

[0002] At present, the hydraulic valves used to control the reversing of hydraulic actuators in hydraulic systems are generally directional control valves in the form of three-position four-way, two-position four-way, three-position three-way, two-position three-way, two-position two-way, etc., or a cartridge valve is used in combination with a pilot reversing valve to realize the reversing function of the hydraulic actuator. However, for the application scenario of using a parent-child hydraulic cylinder structure as an actuator in a hydraulic press, at least two reversing valves are required to complete the motion control of the parent-child hydraulic cylinder. Not only are two reversing valves required, but the accompanying integrated valve plate is also relatively complex, and the control function cannot be realized with a standard reversing valve integrated valve plate. If there is a reversing valve that can realize the motion control of the parent-child hydraulic cylinder with only one, it will greatly simplify the existing parent-child hydraulic cylinder control hydraulic system, and will have significant advantages in terms of the use cost of the hydraulic valve and the manufacturing cost of the valve block, reducing the comprehensive manufacturing cost and application threshold of the parent-child hydraulic cylinder hydraulic system. Summary of the Invention

[0003] The problem to be solved by the present invention is to develop a reversing valve that can realize the control of the movement of the parent and child hydraulic cylinders with only one valve, so as to upgrade and simplify the existing parent and child hydraulic cylinder control hydraulic system solution.

[0004] The technical problem of the present invention is implemented through the following technical solution: a four-position five-way hydraulic reversing valve, comprising a valve body (11) and a valve core (12), the valve body (11) being provided with a hole that slides with the valve core (12), the valve body (11) being provided with an oil chamber (P), an oil chamber (T), an oil chamber (A), and an oil chamber (B), the contact surface between the valve core (12) and the valve body (11) having a sealing function, and being used for connecting or isolating the oil chambers, characterized in that the valve body (11) is further provided with an oil chamber (A1); the valve core (12) moves in the hole of the valve body (11) along the axial direction of the hole to form four working positions; in one of the four working positions, two consecutive working positions are in a state in which the oil chamber (P) is connected to the oil chamber (A), and the oil chamber (A) is isolated from the oil chamber (A1), and the state of the other working position is in which the oil chamber (P) is connected to the oil chamber (A) and the oil chamber (A1).

[0005] The four-position five-way hydraulic reversing valve as described above is characterized in that the oil chamber (A), the oil chamber (B), and the oil chamber (A1) are used to connect the hydraulic actuator.

[0006] Compared with the prior art, the beneficial effects of the present invention are: only one reversing valve is required to realize the motion control of the parent and child hydraulic cylinders, which saves one reversing valve compared to the prior art which requires two reversing valves for combined control, and reduces the manufacturing cost of the matching integrated valve plate, simplifies the control circuit, and optimizes the overall manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is the hydraulic function symbol diagram of the present invention Figure 2 This is a structural diagram of the present invention in which the working position is in the middle state. Figure 3 This is a structural diagram of the present invention in which the working position is in the left position. Figure 4 This is a structural diagram of the present invention in the working position in the left second position Figure 5 This is a structural diagram of the present invention in the right working position. Figure 6 This is the hydraulic principle diagram of the first embodiment of the present invention Figure 7 Hydraulic principle diagram of the prior art DETAILED DESCRIPTION

[0008] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention for which protection is sought, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0009] In the description of the present invention, it should be understood that the terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0010] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0011] In the present invention, unless otherwise expressly specified or limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0012] First embodiment: A control circuit of a mother-and-child hydraulic cylinder comprises the four-position five-way reversing valve (1) of the present invention, a balancing valve (2), a filling valve (3), and a mother-and-child hydraulic cylinder (4). The balancing valve (2) is connected between the rod chamber of the mother-and-child hydraulic cylinder (4) and the oil chamber (B) of the four-position five-way reversing valve (1) and is used to balance the weight of the mother-and-child hydraulic cylinder piston to obtain a steady descending speed. The filling valve (3) is connected to the rodless chamber of the mother-and-child hydraulic cylinder and is used to fill the mother-and-child hydraulic cylinder with liquid and oil when the mother-and-child hydraulic cylinder is extended quickly. The oil chamber (A) of the four-position five-way reversing valve (1) is directly connected to the sub-cylinder oil port of the mother-and-child hydraulic cylinder (4), and the oil chamber (A1) of the four-position five-way reversing valve (1) is connected to the rodless chamber of the mother-and-child hydraulic cylinder (4).

[0013] The oil chamber (P), oil chamber (T), oil chamber (A), oil chamber (B), and oil chamber (A1) of the valve body (11) of the four-position five-way reversing valve (1) are connected to the valve body surface respectively. The valve core (12) moves axially in the hole of the valve body (11), so that the four-position five-way reversing valve (1) can produce four working positions, namely the left second position, the left first position, the middle position, and the right position. When the four-position five-way reversing valve (1) is in the middle position, the oil chamber (P), oil chamber (T), oil chamber (A), oil chamber (B), and oil chamber (A1) are all in an isolated state and mutually closed. The phases are not connected; when the four-position five-way directional control valve (1) is in the left first position, the oil chamber (P) is connected to the oil chamber (A), the oil chamber (B) and the oil chamber (T) are connected, and the oil chamber (A1) is in an isolated state and is not connected to any oil chamber; when the four-position five-way directional control valve (1) is in the left second position, the oil chamber (P) is connected to the oil chamber (A) and the oil chamber (A1), and the oil chamber (B) and the oil chamber (T) are connected; when the four-position five-way directional control valve (1) is in the right position, the oil chamber (P) is connected to the oil chamber (B), and the oil chamber (A), the oil chamber (A1) and the oil chamber (T) are connected.

[0014] When the parent and child hydraulic cylinders (4) are not in motion, the four-position five-way reversing valve (1) remains in a neutral position, the oil chamber (P), the oil chamber (T), the oil chamber (A), the oil chamber (B), and the oil chamber (A1) are all in an isolated state, the rod chamber, the rodless chamber, and the sub-cylinder oil port of the parent and child hydraulic cylinders are unable to inlet or discharge oil, and the parent and child hydraulic cylinders will remain in a stopped position.

[0015] When the parent-child hydraulic cylinder (4) needs to be extended quickly, the four-position five-way reversing valve (1) switches to the left first position, and the pressure oil is introduced from the oil chamber (P) through the oil chamber (A) into the sub-cylinder oil port of the parent-child hydraulic cylinder (4). Since the sub-cylinder has a small effective area, it can quickly push the piston to extend. At the same time, the pressure of the oil chamber (A) of the four-position five-way reversing valve (1) is also guided into the control port of the balance valve (2). The balance valve (2) will open with less resistance, and the hydraulic oil in the rod chamber of the parent-child hydraulic cylinder is discharged and returns to the oil chamber (T) through the oil chamber (B) of the four-position five-way reversing valve (1). The rodless chamber of the parent-child hydraulic cylinder (4) is replenished with hydraulic oil from the oil tank through the filling valve.

[0016] When the parent-child hydraulic cylinder (4) needs to be pressurized, the four-position five-way reversing valve (1) switches to the left second position, the oil chamber (P) is connected with the oil chamber (A) and the oil chamber (A1), and the pressure oil is simultaneously introduced into the sub-cylinder interface and the rodless chamber of the parent-child hydraulic cylinder (4). The hydraulic oil in the rod chamber of the parent-child hydraulic cylinder is discharged and returns to the oil chamber (T) through the oil chamber (B) of the four-position five-way reversing valve (1). The filling valve (3) is passively closed. Since the rodless chamber of the parent-child hydraulic cylinder (4) has a larger effective area, it can push the piston to extend and generate a larger force, which is pressurization.

[0017] When the parent-child hydraulic cylinder (4) needs to be reset, the four-position five-way reversing valve (1) switches to the right position, the oil chamber (P) and the oil chamber (B) are connected, the oil chamber (A), the oil chamber (A1) and the oil chamber (T) are connected, and the pressure oil is introduced from the oil chamber (P) to the oil chamber (B) through the balance valve (2) and then into the rod chamber of the parent-child hydraulic cylinder (4), pushing the parent-child hydraulic cylinder to reset. At the same time, the pressure oil is guided into the control port of the filling valve through the oil chamber (B) of the four-position five-way reversing valve (1). The filling valve opens, and the rodless chamber of the parent-child hydraulic cylinder (4) discharges hydraulic oil through the filling valve (3). At the same time, the hydraulic oil is also discharged from the oil chamber (A1) of the four-position five-way reversing valve (1) to the oil chamber (T). The sub-cylinder oil port of the parent-child hydraulic cylinder (4) discharges hydraulic oil through the oil chamber (A) of the four-position five-way reversing valve (1) to the oil chamber (T).

[0018] In order to better understand the innovation and advantages of the present invention, the existing technology of the control circuit of the mother-and-child hydraulic cylinder is described: the control circuit of the mother-and-child hydraulic cylinder includes a reversing valve (5), a reversing valve (6), a balancing valve (2), a filling valve (3), and a mother-and-child hydraulic cylinder (4). The balancing valve (2) is connected between the rod chamber of the mother-and-child hydraulic cylinder (4) and the reversing valve (5) and is used to balance the piston weight of the mother-and-child hydraulic cylinder (4) to obtain a steady descending speed. The filling valve (3) is connected to the rodless chamber of the mother-and-child hydraulic cylinder (4) and is used to fill the mother-and-child hydraulic cylinder (4) with liquid and oil when it is quickly extended. The reversing valve (6) is connected between the reversing valve (5) and the rodless chamber of the mother-and-child hydraulic cylinder (4).

[0019] When the parent-child hydraulic cylinder (4) needs to be extended quickly, the reversing valve (5) switches to the right position to work, and the pressure oil is introduced into the sub-cylinder oil port of the parent-child hydraulic cylinder (4). Since the sub-cylinder has a small effective area, it can quickly push the piston to extend. At the same time, the pressure oil between the reversing valve (5) and the sub-cylinder oil port is also introduced into the control port of the balance valve (2). The balance valve (2) will open with a small resistance. The hydraulic oil in the rod chamber of the parent-child hydraulic cylinder (4) passes through the balance valve (2) and is discharged from the oil port of the reversing valve (5). The rodless chamber of the parent-child hydraulic cylinder (4) is replenished with hydraulic oil from the oil tank through the filling valve.

[0020] When the parent-child hydraulic cylinder (4) needs to be pressurized, the reversing valve (5) keeps working in the right position, while the reversing valve (6) works in the left position. The pressure oil enters the rodless cavity of the parent-child hydraulic cylinder (4) after passing through the reversing valve (6), and the filling valve (3) is passively closed. Since the rodless cavity of the parent-child hydraulic cylinder (4) has a large effective area, it can push the piston to extend and generate a large force, which is pressurization.

[0021] When the parent and child hydraulic cylinders (4) need to be reset, the reversing valve (5) works in the left position, guiding the pressure oil through the balance valve (2) and into the rod chamber of the parent and child hydraulic cylinders (4), pushing the parent and child hydraulic cylinders to reset. At the same time, the pressure oil is also guided into the control port of the filling valve after passing through the reversing valve (5). The filling valve is opened, and the rodless chamber of the parent and child hydraulic cylinders (4) is discharged through the filling valve (3). The hydraulic oil of the sub-cylinder is discharged from the oil port of the reversing valve (5).

[0022] After comparison, it is found that both the technology of the present invention and the prior art can realize reliable control of the parent-child hydraulic cylinder, but the technology of the present invention has a simpler structure and only requires one reversing valve to realize the motion control of the parent-child hydraulic cylinder (4). Compared with the prior art, one reversing valve is saved, and the processing cost of the integrated valve plate is also reduced, thereby reducing the overall cost.

[0023] The present invention is not limited to the above-mentioned embodiments. If various changes or modifications of the present invention do not depart from the spirit and scope of the present invention, and if these changes and modifications fall within the scope of the claims of the present invention and equivalent technologies, the present invention also includes these changes and modifications.

Claims

1. A four-position five-way hydraulic reversing valve, comprising a valve body (11) and a valve core (12), wherein the valve body (11) is provided with a hole for slidingly cooperating with the valve core (12), the valve body (11) is provided with an oil chamber (P), an oil chamber (T), an oil chamber (A), and an oil chamber (B), and the contact surface between the valve core (12) and the valve body (11) has a sealing function for connecting or isolating the oil chambers, characterized in that: The valve body (11) is further provided with an oil chamber (A1); the valve core (12) moves in the hole of the valve body (11) along the axial direction of the hole to form four working positions; in one of the four working positions, the oil chamber (P) and the oil chamber (A) are in communication, and the oil chamber (A) and the oil chamber (A1) are isolated; the other working position is in communication with the oil chamber (P), the oil chamber (A) and the oil chamber (A1).

2. A four-position five-way hydraulic reversing valve as claimed in claim 1, characterized in that: Oil chamber (A), oil chamber (B), and oil chamber (A1) are used to connect hydraulic actuators.

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