A four-position five-way hydraulic directional control valve

Abstract

A four-position five-way hydraulic reversing valve, comprising a valve body 11 and a valve core 12, the valve body 11 is provided with a hole in sliding fit with the valve core 12, the valve body 11 is provided with an oil cavity P, an oil cavity T, an oil cavity A, an oil cavity B, characterized in that the valve body 11 is further provided with an oil cavity A1, and the total number of oil cavities reaches five; the valve core 12 moves axially in the hole of the valve body 11, forming four working positions. The utility model expands the number of oil cavities and working positions of the hydraulic reversing valve, widens the function of the hydraulic reversing valve, can replace the function achieved by several traditional reversing valves, such as the primary and secondary hydraulic cylinder control circuit of the hydraulic machine, and only one four-position five-way hydraulic reversing valve of the utility model can complete the control, so that the structure of the hydraulic system is simplified and the overall manufacturing cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic control, and specifically relates to a hydraulic directional valve. Background Technology

[0002] Currently, the hydraulic valves used in hydraulic systems to control the reversing of hydraulic actuators 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, and two-position two-way valves, or cartridge valves combined with pilot-operated directional control valves to achieve the reversing function of hydraulic actuators. However, for applications in hydraulic presses that use a master-slave hydraulic cylinder structure as the actuator, at least two directional control valves are required to complete the motion control of the master-slave hydraulic cylinder. Not only are two directional control valves required, but the matching integrated valve plates are also relatively complex, and the control function cannot be achieved using standard directional control valve integrated valve plates. If there were a directional control valve that could achieve the motion control of the master-slave hydraulic cylinder with only one valve, it would greatly simplify the existing master-slave hydraulic cylinder control hydraulic system. It would have significant advantages in terms of the use cost of hydraulic valves and the manufacturing cost of valve blocks, reducing the overall manufacturing cost and application threshold of the master-slave hydraulic cylinder hydraulic system. Summary of the Invention

[0003] The problem to be solved by this utility model is to develop a reversing valve that can control the action of the master and slave hydraulic cylinders with only one valve, thereby upgrading and simplifying the existing master and slave hydraulic cylinder control hydraulic system.

[0004] The technical problem of this utility model is solved by the following technical solution: a four-position five-way hydraulic directional valve, including a valve body (11) and a valve core (12), the valve body (11) is provided with a hole that slides with the valve core (12), the valve body (11) is provided with oil chamber (P), oil chamber (T), oil chamber (A) and oil chamber (B), the contact surface of the valve core (12) and the valve body (11) has a sealing function for communication or isolation between the oil chambers, characterized in that the valve body (11) is also provided with an oil chamber (A1); the valve core (12) moves along the axis of the hole in the valve body (11) to form four working positions; among the four working positions, one of the two consecutive working positions is in a state where the oil chamber (P) and the oil chamber (A) are connected and the oil chamber (A) and the oil chamber (A1) are isolated, and the other working position is in a state where the oil chamber (P) and the oil chamber (A) and the oil chamber (A1) are connected.

[0005] The four-position five-way hydraulic directional valve described above is characterized in that oil chambers (A), (B), and (A1) are used to connect hydraulic actuators.

[0006] Compared with the prior art, the beneficial effects of this utility model are: only one directional valve is needed to realize the motion control of the master and slave hydraulic cylinders, which saves one directional valve compared with the prior art which requires two directional valves for combined control. In addition, it reduces the manufacturing cost of the matching integrated valve plate, simplifies the control circuit, and optimizes the overall manufacturing cost. Attached Figure Description

[0007] Figure 1 This is a symbol diagram of the hydraulic function of this utility model.

[0008] Figure 2 This is a schematic diagram of the structure of the present invention in the middle working position.

[0009] Figure 3 This is a schematic diagram of the structure of the present invention in the leftmost position.

[0010] Figure 4 This is a schematic diagram of the structure of the present invention with the working position in the second-to-left position.

[0011] Figure 5 This is a schematic diagram of the structure of the present invention in the right-hand position.

[0012] Figure 6 This is a hydraulic schematic diagram of the first embodiment of the present invention.

[0013] Figure 7 Hydraulic schematic diagram of existing technology Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0015] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0016] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0017] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0018] First embodiment: The control circuit of the master and slave hydraulic cylinder includes the four-position five-way directional valve (1), balance valve (2), filling valve (3), master and slave hydraulic cylinder (4). The balance valve (2) is connected between the rod chamber of the master and slave hydraulic cylinder (4) and the oil chamber (B) of the four-position five-way directional valve (1) to balance the weight of the piston of the master and slave hydraulic cylinder to obtain a smooth descent speed. The filling valve (3) is connected to the rodless chamber of the master and slave hydraulic cylinder to fill the master and slave hydraulic cylinder with oil when it extends quickly. The oil chamber (A) of the four-position five-way directional valve (1) is directly connected to the slave cylinder oil port of the master and slave hydraulic cylinder (4). The oil chamber (A1) of the four-position five-way directional valve (1) is connected to the rodless chamber of the master and slave hydraulic cylinder (4).

[0019] The oil chambers (P), (T), (A), (B), and (A1) of the valve body (11) of the four-position five-way directional valve (1) are respectively connected to the valve body surface. The valve core (12) moves axially within the bore of the valve body (11), allowing the four-position five-way directional valve (1) to generate four working positions: left second position, left first position, center position, and right position. When the four-position five-way directional valve (1) is in the center position, the oil chambers (P), (T), (A), (B), and (A1) are all isolated from each other. The phases are not connected; when the four-position five-way directional valve (1) is in the left first position, the oil chamber (P) and oil chamber (A) are connected, the oil chamber (B) and oil chamber (T) are connected, and the oil chamber (A1) is in the isolated state and is not connected to any oil chamber; when the four-position five-way directional valve (1) is in the left second position, the oil chamber (P) and oil chamber (A) and oil chamber (A1) are connected, and the oil chamber (B) and oil chamber (T) are connected; when the four-position five-way directional valve (1) is in the right position, the oil chamber (P) and oil chamber (B) are connected, and the oil chamber (A), oil chamber (A1) and oil chamber (T) are connected.

[0020] When the master hydraulic cylinder (4) is not in operation, the four-position five-way directional valve (1) remains in the neutral position. The oil chambers (P), (T), (A), (B), and (A1) are all isolated. The rod chamber, rodless chamber, and oil port of the master hydraulic cylinder cannot receive or discharge oil. The master hydraulic cylinder will remain in the stop position.

[0021] When the master hydraulic cylinder (4) needs to extend quickly, the four-position five-way directional valve (1) switches to the left position. The pressure oil is introduced from the oil chamber (P) through the oil chamber (A) into the oil port of the slave cylinder of the master hydraulic cylinder (4). Since the slave cylinder has a small working 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 directional valve (1) is also guided 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 master hydraulic cylinder is discharged and returns to the oil chamber (T) through the oil chamber (B) of the four-position five-way directional valve (1). The rodless chamber of the master hydraulic cylinder (4) is replenished with hydraulic oil from the oil tank through the filling valve.

[0022] When the master hydraulic cylinder (4) needs to be pressurized, the four-position five-way directional valve (1) switches to the left second position, and the oil chamber (P), oil chamber (A), and oil chamber (A1) are connected. The pressurized oil is introduced into the slave cylinder interface and rodless chamber of the master hydraulic cylinder (4) at the same time. The hydraulic oil in the rod chamber of the master hydraulic cylinder is discharged and returns to the oil chamber (T) through the oil chamber (B) of the four-position five-way directional valve (1). The filling valve (3) is passively closed. Since the rodless chamber of the master hydraulic cylinder (4) has a large working area, it can push the piston to extend and generate a large force, which is the pressurization.

[0023] When the master hydraulic cylinder (4) needs to be reset, the four-position five-way directional valve (1) switches to the right position, the oil chamber (P) and the oil chamber (B) are connected, and the oil chamber (A), the oil chamber (A1) and the oil chamber (T) are connected. The pressure oil is introduced from the oil chamber (P) to the oil chamber (B) through the balance valve (2) and then introduced into the rod chamber of the master hydraulic cylinder (4) to push the master 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 directional valve (1). The filling valve opens, and the rodless chamber of the master hydraulic cylinder (4) discharges hydraulic oil through the filling valve (3). At the same time, it also discharges hydraulic oil through the oil chamber (A1) to the oil chamber (T) of the four-position five-way directional valve (1). The oil port of the slave cylinder (4) discharges hydraulic oil through the oil chamber (A) to the oil chamber (T) of the four-position five-way directional valve (1).

[0024] To better understand the innovation and advantages of this utility model, the prior art of the master-slave hydraulic cylinder control circuit is described below: The master-slave hydraulic cylinder control circuit includes a reversing valve (5), a reversing valve (6), a balance valve (2), a filling valve (3), a master-slave hydraulic cylinder (4), a balance valve (2) connected between the rod chamber of the master-slave hydraulic cylinder (4) and the reversing valve (5), used to balance the piston weight of the master-slave hydraulic cylinder (4) to obtain a smooth descent speed, the filling valve (3) connected to the rodless chamber of the master-slave hydraulic cylinder (4), used to fill the master-slave hydraulic cylinder (4) with fluid and oil when it extends rapidly, and the reversing valve (6) connected between the reversing valve (5) and the rodless chamber of the master-slave hydraulic cylinder (4).

[0025] When the master hydraulic cylinder (4) needs to extend quickly, the reversing valve (5) switches to the right position and introduces pressure oil into the slave cylinder port of the master hydraulic cylinder (4). Since the slave cylinder has a small working area, it can quickly push the piston to extend. At the same time, the pressure oil between the reversing valve (5) and the slave cylinder 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 master hydraulic cylinder (4) is discharged from the oil port of the reversing valve (5) after passing through the balance valve (2). The rodless chamber of the master hydraulic cylinder (4) is replenished with hydraulic oil from the oil tank through the filling valve.

[0026] When the master hydraulic cylinder (4) needs to be pressurized, the reversing valve (5) remains in the right position and the reversing valve (6) is in the left position. The pressurized oil enters the rodless chamber of the master hydraulic cylinder (4) after passing through the reversing valve (6). The filling valve (3) is passively closed. Since the rodless chamber of the master hydraulic cylinder (4) has a large working area, it can push the piston to extend and generate a large force, which is the pressurization.

[0027] When the master and slave hydraulic cylinders (4) need to be reset, the directional valve (5) operates in the left position, guiding the pressure oil through the balance valve (2) and into the rod chamber of the master and slave hydraulic cylinders (4), pushing the master and slave hydraulic cylinders to reset. At the same time, the pressure oil also enters the control port of the filling valve after passing through the directional valve (5). The filling valve opens, and the rodless chamber of the master and slave hydraulic cylinders (4) discharges hydraulic oil through the filling valve (3). The hydraulic oil of the slave cylinder is discharged from the oil port of the directional valve (5).

[0028] After comparison, both the present invention and the prior art can achieve reliable control of the master and slave hydraulic cylinders. However, the present invention has a simpler technical structure and only requires a reversing valve to achieve the action control of the master and slave hydraulic cylinders (4). Compared with the prior art, it saves a reversing valve and also reduces the processing cost of the integrated valve plate, thus reducing the overall cost.

[0029] This utility model is not limited to the above-described embodiments. If any modifications or variations to this utility model do not depart from the spirit and scope of this utility model, and if such modifications and variations fall within the scope of the claims and equivalent technologies of this utility model, then this utility model also includes such modifications and variations.

Claims

1. A four-position five-way hydraulic directional valve, comprising a valve body (11) and a valve core (12), wherein the valve body (11) is provided with a hole for sliding engagement with the valve core (12), and the valve body (11) is provided with oil chambers (P), (T), (A), and (B), wherein the contact surface between the valve core (12) and the valve body (11) has a sealing function for communication or isolation between the oil chambers, characterized in that, The valve body (11) is also provided with an oil chamber (A1); the valve core (12) moves along the axis of the hole in the valve body (11) to form four working positions; among the four working positions, one of the two consecutive working positions is in a state where the oil chamber (P) and the oil chamber (A) are connected and the oil chamber (A) and the oil chamber (A1) are isolated, and the other working position is in a state where the oil chamber (P) and the oil chamber (A) and the oil chamber (A1) are connected.

2. A four-position five-way hydraulic directional valve as described in claim 1, characterized in that, Oil chambers (A), (B), and (A1) are used to connect hydraulic actuators.

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