Variable control mechanism applied to motor and plunger motor

Abstract

The variable control mechanism comprises a valve body, a proportional pressure reduction component and a proportional reversing component, an installation cavity is formed in the valve body, a valve sleeve is fixedly arranged in the installation cavity, a valve element is installed in the valve sleeve, the valve element can slide relative to the valve sleeve, and the proportional pressure reduction component and the proportional reversing component are arranged on the valve body. The valve core and the bottom of the mounting cavity form a closed cavity; the proportional pressure reducing component is installed on the valve body, and a pilot oil port X is formed in the valve body and communicated with an inlet of the proportional pressure reducing component. The proportional reversing component is installed on the valve body, an outlet of the proportional pressure reduction component is communicated with an inlet of the proportional reversing component, and the proportional reversing component is communicated with the closed cavity. The structure of the valve body is improved, the proportional pressure reduction component and the proportional reversing component are installed on the valve body, and proportional adjustment of motor displacement and protection during pressure overshoot can be achieved through mutual matching of the proportional pressure reduction component and the proportional reversing component.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and particularly relates to a variable control mechanism and a piston motor applied to motors. Background Art

[0002] A hydraulic motor is an actuator of a hydraulic system, which converts the hydraulic pressure energy provided by a hydraulic pump into the mechanical energy (torque and speed) of its output shaft. The liquid is the medium for transmitting force and motion. It is mainly applied to injection molding machinery, ships, hoisting machines, construction machinery, building machinery, coal mining machinery, mining machinery, metallurgical machinery, ship machinery, petrochemical industry, port machinery, etc. The variable control mechanism is an important control component in the piston motor and can control the displacement change of the motor. For example, when the pressure of the piston motor reaches the pressure requirement set by the control mechanism, the high-pressure oil output by the piston motor will act on the large and small chambers of the piston, and the motor displacement will be adjusted.

[0003] In the existing closed-loop system of the motor, the operation of the control mechanism of the piston motor is controlled by externally connected pilot oil. The pilot oil source is a make-up oil pump, and the output pressure of the make-up oil pump is a constant pressure, which cannot meet the proportional change requirement of the piston motor and the protection requirement during pressure overshoot. Summary of the Utility Model

[0004] In order to solve the problems existing in the prior art, the utility model provides a variable control mechanism and a piston motor applied to motors, which can meet the proportional change requirement of the piston motor and the protection requirement during pressure overshoot through structural improvement.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a variable control mechanism applied to a motor, comprising:

[0006] A valve body, an installation cavity is opened in the valve body, a valve sleeve is fixedly arranged in the installation cavity, a valve core is installed in the valve sleeve, the valve core can slide relative to the valve sleeve, and a closed cavity is formed between the valve core and the bottom of the installation cavity;

[0007] A proportional pressure reducing component, the proportional pressure reducing component is installed on the valve body, a pilot oil port X is opened on the valve body, and the pilot oil port X is communicated with the inlet of the proportional pressure reducing component;

[0008] A proportional reversing component, the proportional reversing component is installed on the valve body, the outlet of the proportional pressure reducing component is communicated with the inlet of the proportional reversing component, and the proportional reversing component is communicated with the closed cavity.

[0009] Further, a first oil port P1 and a second oil port P2 are provided on the valve body. Both the first oil port P1 and the second oil port P2 are connected to the proportional directional component. When the first oil port P1 is a high-pressure oil port, the second oil port P2 is a low-pressure oil port; when the second oil port P2 is a high-pressure oil port, the first oil port P1 is a low-pressure oil port.

[0010] Further, an auxiliary high-pressure oil port G is provided on the valve body. The auxiliary high-pressure oil port G is connected to the proportional directional component.

[0011] Further, a first control oil port A and a second control oil port P3 are provided on the valve body. Both the first control oil port A and the second control oil port P3 are connected to the proportional directional component.

[0012] Further, an oil drain port T is also provided on the valve body. The oil drain port T is connected to the proportional directional component.

[0013] Further, the valve body includes: a main body and a mounting portion. The mounting portion is integrally formed with the main body. An installation hole for installing the proportional pressure reducing component is provided on the mounting portion.

[0014] Further, the installation cavity is located on the main body.

[0015] Further, a screw and a nut are installed on the main body. The screw is threadedly connected to the nut.

[0016] The present utility model also provides a piston motor, including the variable control mechanism as described above.

[0017] The beneficial effects of the present utility model are as follows. Through structural improvement, the proportional pressure reducing component and the proportional directional component are installed on the valve body. Through the mutual cooperation of the proportional pressure reducing component and the proportional directional component, proportional adjustment of the motor displacement and protection during pressure overshoot can be achieved. Moreover, the proportional pressure reducing component and the proportional directional component are directly installed on the valve body, eliminating the need for additional connecting pipelines, which is beneficial to reducing the structural complexity and saving costs. Description of the Drawings

[0018] The following further describes the present utility model in conjunction with the drawings and embodiments.

[0019] Figure 1 is a cross-sectional view of the variable control mechanism of the present utility model.

[0020] Figure 2 is a cross-sectional view of the valve body of the present utility model.

[0021] Figure 3 is a three-dimensional structural schematic diagram of the valve body of the present utility model.

[0022] Figure 4 It is a schematic diagram of the auxiliary high-pressure oil port G of the present utility model.

[0023] Figure 5 It is the control principle diagram of the variable control mechanism of the present utility model.

[0024] Figure 6 It is the current-pressure change curve of the proportional pressure reducing component of the present utility model.

[0025] In the figure: 1, valve body; 2, valve sleeve; 3, valve core; 4, proportional pressure reducing component; 5, proportional direction-changing component; 6, screw; 7, nut; 101, closed cavity; 102, main body; 103, mounting part; 1031, mounting hole. Specific embodiments

[0026] Now, the present utility model will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0027] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present utility model. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "plurality" is two or more.

[0028] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0029] Such as Figures 1 to 6As shown in the figure, the variable control mechanism of the present utility model includes: a valve body 1, a proportional pressure reducing component 4, and a proportional direction changing component 5. An installation cavity is provided in the valve body 1, and a valve sleeve 2 is fixedly installed in the installation cavity. A valve core 3 is installed in the valve sleeve 2, and the valve core 3 can slide relative to the valve sleeve 2. A closed cavity 101 is formed between the valve core 3 and the bottom of the installation cavity; the proportional pressure reducing component 4 is installed on the valve body 1, and a pilot oil port X is provided on the valve body 1, and the pilot oil port X is communicated with the inlet of the proportional pressure reducing component 4; the proportional direction changing component 5 is installed on the valve body 1, the outlet of the proportional pressure reducing component 4 is communicated with the inlet of the proportional direction changing component 5, and the proportional direction changing component 5 is communicated with the closed cavity 101.

[0030] Through structural improvement of the valve body 1, the proportional pressure reducing component 4 and the proportional direction changing component 5 are installed on the valve body 1. Through the mutual cooperation of the proportional pressure reducing component 4 and the proportional direction changing component 5, proportional adjustment of the motor displacement and protection during pressure overshoot can be achieved.

[0031] For example, the proportional pressure reducing component 4 is an electro-hydraulic proportional pressure reducing valve, and the proportional direction changing component 5 is a proportional direction changing valve.

[0032] Specifically, a first oil port P1, a second oil port P2, an auxiliary high-pressure oil port G, a first control oil port A, a second control oil port P3, and a drain port T are provided on the valve body 1. The first oil port P1 and the second oil port P2 are both connected to the proportional direction changing component 5, the auxiliary high-pressure oil port G is connected to the proportional direction changing component 5, the first control oil port A and the second control oil port P3 are both connected to the proportional direction changing component 5, and the drain port T is connected to the proportional direction changing component 5. When the first oil port P1 is the high-pressure oil port, the second oil port P2 is the low-pressure oil port, and when the second oil port P2 is the high-pressure oil port, the first oil port P1 is the low-pressure oil port.

[0033] By changing the magnitude of the current input to the proportional pressure reducing component 4 (the current acts on the electromagnet in the proportional pressure reducing component 4), the pressure at the oil port P4 of the proportional pressure reducing component 4 can be controlled proportionally. When no current is input to the proportional pressure reducing component 4, the pilot oil port X is closed, and the oil port P4 is communicated with the drain port T. When current is input to the proportional pressure reducing component 4, the pilot oil port X is communicated with the oil port P4, the drain port T is closed, and the output pressure of the oil port P4 increases proportionally with the increase of the input current. When the input current is stable, the pressure at the oil port P4 will continue to rise due to external force, and the pilot oil port X will be closed again. At the same time, the oil port P4 will be temporarily communicated with the drain port T until the pressure at the oil port P4 drops to a reasonable range, and then the pilot oil port X will be communicated with the oil port P4 again, and the drain port T will be closed. When the first oil port P1 or the second oil port P2 is the high-pressure oil port and the pressure value does not meet the requirements, the auxiliary high-pressure oil port G can be used to increase the pressure value.

[0034] In this embodiment, the valve body 1 includes: a main body 102 and a mounting portion 103. The mounting portion 103 is integrally formed with the main body 102. An installation hole 1031 for installing the proportional pressure reducing component 4 is provided on the mounting portion 103. The installation cavity is located on the main body 102. The existing valve body 1 only has the main body 102 part. The valve body 1 of this embodiment is provided with the mounting portion 103, and the proportional pressure reducing component 4 is fixedly connected to the installation hole 1031 by thread. The proportional direction changing component 5 is installed on the main body 102 by plugging. Among them, the first oil port P1, the second oil port P2, the auxiliary high-pressure oil port G, the first control oil port A, the second control oil port P3, and the drain port T are all provided on the main body 102, and the pilot oil port X is provided on the mounting portion 103. A plurality of flow channels are provided inside the valve body 1 for connecting related oil ports.

[0035] For example, a screw 6 and a nut 7 are installed on the main body 102, and the screw 6 is threadedly connected to the nut 7. It should be noted that the pressure in the closed cavity 101 is regulated by the proportional pressure reducing component 4 and the proportional direction changing component 5. When the pressure in the closed cavity 101 increases to a certain extent, the valve core 3 can be pushed upward. The upper end of the valve core 3 is connected with a spring seat (not shown in the figure) and a plunger (not shown in the figure). By changing the displacement of the plunger, the displacement of the motor can be regulated. When the hydraulic oil acts on the valve core 3 and the displacement of the valve core 3 does not meet the requirements (there is a slight deviation), compensation can be made by moving the screw 6. The upper end of the screw 6 abuts against the spring seat. During actual use, the screw 6 can be rotated by means of work. Since the screw 6 is threadedly connected to the nut 7, rotating the screw 6 can make the screw 6 move axially to increase / decrease the pressure on the spring seat, thereby compensating for the slight deviation of the displacement of the valve core 3 caused by the hydraulic pressure.

[0036] Working process:

[0037] When the electromagnet of the proportional pressure reducing component 4 is not energized and the electromagnet is in the right position, the pilot oil port X is closed, the oil port P4 is communicated with the drain port T, and the proportional direction changing component 5 is in the right position working state. At this time, the first control oil port A is communicated with the drain port T, and the motor is in the maximum displacement state.

[0038] When the electromagnet of the proportional pressure reducing component 4 is energized and the electromagnet is in the left position, the pilot oil port X is communicated with the oil port P4, the drain port T is closed, and the proportional direction changing component 5 is in the left position working state. At this time, the first control oil port A is communicated with the first oil port P1, the second oil port P2, the second control oil port P3, and the auxiliary high-pressure oil port G, and the motor is in the minimum displacement.

[0039] By changing the magnitude of the current, the pressure at the oil port P4 can be adjusted, thereby changing the pressure value at the closed cavity 101 to change the displacement of the motor.

[0040] When the pressure at the pilot oil port X exceeds the set pressure, the electromagnet of the proportional pressure reducing component 4 will switch between the left and right positions to release a part of the pressure, so as to ensure that the pressure in the closed cavity 101 will not exceed and achieve protection.

[0041] The present utility model also provides a plunger motor, including the above variable control mechanism.

[0042] To sum up, through structural improvement, the present utility model installs the proportional pressure reducing component 4 and the proportional direction changing component 5 on the valve body 1. Through the mutual cooperation of the proportional pressure reducing component 4 and the proportional direction changing component 5, the proportional adjustment of the motor displacement and the protection during pressure overshoot can be achieved.

[0043] Inspired by the ideal embodiments of the present utility model described above, through the above description, relevant staff can completely make various changes and modifications within the scope not deviating from the technical idea of the present utility model. The technical scope of the present utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A variable control mechanism applied to a motor, characterized in that: include: A valve body (1), wherein the valve body (1) has an installation cavity, a valve sleeve (2) is fixedly arranged in the installation cavity, a valve core (3) is installed in the valve sleeve (2), the valve core (3) can slide relative to the valve sleeve (2), and the valve core (3) and the bottom of the installation cavity form a closed cavity (101); A proportional pressure reducing component (4), the proportional pressure reducing component (4) being mounted on the valve body (1), the valve body (1) being provided with a pilot oil port X, the pilot oil port X being in communication with an inlet of the proportional pressure reducing component (4); A proportional reversing component (5), wherein the proportional reversing component (5) is mounted on the valve body (1), the outlet of the proportional pressure reducing component (4) is connected to the inlet of the proportional reversing component (5), and the proportional reversing component (5) is connected to the closed chamber (101).

2. The variable control mechanism for a motor as claimed in claim 1, characterized in that: The valve body (1) is provided with a first oil port P1 and a second oil port P2, both of which are connected to the proportional reversing component (5). When the first oil port P1 is a high-pressure oil port, the second oil port P2 is a low-pressure oil port; when the second oil port P2 is a high-pressure oil port, the first oil port P1 is a low-pressure oil port.

3. The variable control mechanism for a motor as claimed in claim 2, characterized in that: The valve body (1) is provided with an auxiliary high-pressure oil port G, and the auxiliary high-pressure oil port G is connected to the proportional reversing component (5).

4. The variable control mechanism for a motor as claimed in claim 3, characterized in that: The valve body (1) is provided with a first control oil port A and a second control oil port P3, and the first control oil port A and the second control oil port P3 are both connected to the proportional reversing component (5).

5. The variable control mechanism for a motor as claimed in claim 4, characterized in that: The valve body (1) is also provided with an oil drain port T, and the oil drain port T is connected to the proportional reversing component (5).

6. The variable control mechanism for a motor as claimed in claim 1, characterized in that: The valve body (1) comprises: a main body (102) and a mounting portion (103); the mounting portion (103) is integrally formed with the main body (102); and a mounting hole (1031) for mounting the proportional pressure reducing component (4) is provided on the mounting portion (103).

7. The variable control mechanism for a motor as claimed in claim 6, characterized in that: The mounting cavity is located on the main body (102).

8. The variable control mechanism for a motor as claimed in claim 6, characterized in that: A screw rod (6) and a nut (7) are mounted on the main body (102), and the screw rod (6) is threadedly connected to the nut (7).

9. A plunger motor, characterized in that: It comprises a variable control mechanism as described in any one of claims 1 to 8.

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