Pneumatic control hydraulic reversing valve

Abstract

The utility model discloses a pneumatic control hydraulic reversing valve which comprises a U-shaped fixing frame, an air cylinder is arranged in the U-shaped fixing frame, one side of the U-shaped fixing frame is connected with a valve shell, a plurality of pipelines are connected in the valve shell, a hydraulic flow channel is arranged in the middle of the interior of the valve shell, and a valve element is connected in the hydraulic flow channel in a sliding mode. A guide assembly used for enhancing the moving and sealing stability of the valve element is arranged in the hydraulic flow channel, it is ensured that the valve element moves along an accurate path in the hydraulic flow channel through the two sets of guide rods, and when the air cylinder drives the valve element, balls in the valve element smoothly roll on the surfaces of the guide rods; the stable motion state enables the valve element and the valve seat to keep good sealing contact all the time, the inner leakage phenomenon is effectively prevented, the guide rod restrains the valve element to move in the preset linear direction by means of the sleeving structure, tightly matched with the valve element, of the guide rod, the valve element is prevented from deviating from the normal position, and the service life of the valve element is prolonged. Therefore, a good sealing state between the valve element and the valve seat is maintained, and the problems of sealing failure and internal leakage caused by shaking of the valve element are solved.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic directional valve technology, specifically relating to a pneumatically controlled hydraulic directional valve. Background Technology

[0002] Hydraulic directional valves are classified according to the number of passages they control: two-way, three-way, four-way, etc. They use a cylinder to drive the valve core to move relative to the valve body, thereby opening, closing, or changing the direction of oil flow in the oil circuit, thus enabling the hydraulic actuators and their drive mechanisms to start, stop, or change the direction of motion.

[0003] In existing pneumatic-controlled hydraulic directional valves, the cylinder in the pneumatic control device is the key component for realizing the valve core's reversing action. When an external pneumatic control signal is received, compressed air enters the cylinder and acts on the pneumatic piston inside. The pneumatic piston is displaced under the pressure of the air. Since the pneumatic piston is closely connected to the valve core, the movement of the piston will drive the valve core to move synchronously within the valve body, thereby changing the connection relationship of the oil ports within the valve body and realizing the switching of the hydraulic oil flow direction. However, when the valve core moves to adjust the oil flow path, all hydraulic circuits are in a closed state. At this time, the continuous discharge of liquid from the pipe ports will cause the system pressure to rise instantaneously. When the channel that needs to be connected is opened, the pressure is suddenly released, and the system will generate a large pressure shock, causing the valve core to vibrate. This makes the valve core prone to displacement due to uneven force, resulting in poor sealing between the valve core and the valve seat and internal leakage. This not only reduces the working efficiency of the hydraulic system and causes energy waste, but may also cause deviations in the action of the actuator, affecting its use. Utility Model Content

[0004] The purpose of this invention is to provide a pneumatically controlled hydraulic directional valve to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pneumatically controlled hydraulic directional valve, comprising:

[0006] A U-shaped fixing frame is provided, with a cylinder inside and a valve housing connected to one side of the U-shaped fixing frame. Several pipes for hydraulic oil flow are connected inside the valve housing. A hydraulic flow channel is provided in the middle of the valve housing, and a valve core for sealing the pipes is slidably connected inside the hydraulic flow channel. A guide assembly is provided inside the hydraulic flow channel to enhance the movement of the valve core and the stability of the seal. The movement direction of the valve core is guided by two sets of guide rods of the guide assembly, so that when the cylinder pushes the valve core to move, the balls inside the valve core roll smoothly on the surface of the guide rods.

[0007] Preferably, the guide assembly includes a sealing ring, two sets of guide rods are connected inside the valve housing and both ends of the valve core are slidably sleeved on the surface of the guide rods, a plurality of sealing gaskets are connected to the surface of the valve housing, and a plurality of balls are provided and are all rotatably connected inside the valve core, with one end of the balls contacting the guide rods.

[0008] Preferably, the sealing ring is provided in several sets and is respectively located at the joint between the valve core and the guide rod.

[0009] Preferably, the piston rod of the cylinder passes through the valve housing and is connected to the valve core, and a sealing ring is provided at the point where the piston rod passes through the valve housing.

[0010] Preferably, the valve housing has a movable groove and a sliding plate is slidably connected in the movable groove. One side of the sliding plate is connected to the valve core, and a spring is connected between the sliding plate and the valve housing.

[0011] Preferably, the pipe is equipped with a filter screen.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] (1) By tightly fitting the two ends of the valve core with two sets of guide rods and setting a sealing ring at the sleeve, the valve core is ensured to move along a precise path in the hydraulic flow channel. When the cylinder drives the valve core, the balls inside the valve core roll smoothly on the surface of the guide rod, which greatly reduces the friction and makes the valve core move more smoothly. This stable movement state allows the valve core and the valve seat to always maintain good sealing contact, effectively preventing the occurrence of internal leakage. When the valve core tends to shake due to pressure fluctuations, hydraulic shocks or other external factors, the guide rod, with its tightly fitting sleeve structure with the valve core, constrains the valve core to move in a predetermined straight direction, preventing the valve core from deviating from the normal position, thereby maintaining a good sealing state between the valve core and the valve seat and avoiding sealing failure and internal leakage caused by valve core shaking.

[0014] (2) During the hydraulic oil circulation process, the filter screen can effectively intercept impurity particles in the oil, preventing them from entering the fit gap between the valve core and the valve body and other precision hydraulic components. By filtering impurities, wear between components is reduced, the cleanliness of the hydraulic oil is maintained, and the normal lubrication and efficient operation of the hydraulic system are ensured. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a cross-sectional view of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure of the present invention when the ball bearings are in contact with the guide rod.

[0018] In the diagram: 1. U-shaped fixing frame; 2. Cylinder; 3. Valve body; 4. Pipeline; 5. Hydraulic flow channel; 6. Valve core; 7. Guide rod; 8. Ball bearing; 9. Sealing ring; 10. Movable groove; 11. Slide plate; 12. Spring; 13. Sealing gasket; 14. Filter screen. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] This utility model provides, for example Figure 1-3 The pneumatically controlled hydraulic directional valve shown includes:

[0021] A U-shaped fixing frame 1 is provided inside the U-shaped fixing frame 1, and a valve housing 3 is connected to one side of the U-shaped fixing frame 1. Several pipes 4 for hydraulic oil flow are connected inside the valve housing 3. A hydraulic flow channel 5 is provided in the middle of the valve housing 3, and a valve core 6 for sealing the pipes 4 is slidably connected in the hydraulic flow channel 5. A guide component is provided in the hydraulic flow channel 5 to enhance the movement and sealing stability of the valve core 6. The movement direction of the valve core 6 is guided by two sets of guide rods 7 of the guide component, so that when the cylinder 2 pushes the valve core 6 to move, the balls 8 inside the valve core 6 roll smoothly on the surface of the guide rods 7.

[0022] The guide assembly includes a sealing ring 9, two sets of guide rods 7 are connected inside the valve housing 3 and the two ends of the valve core 6 are slidably sleeved on the surface of the guide rods 7, a number of sealing gaskets 13 are connected to the surface of the valve housing 3, and a number of balls 8 are provided and are all slidably connected inside the valve core 6, with one end of the balls 8 in contact with the guide rods 7.

[0023] The sealing ring 9 is provided in several sets and is respectively located at the joint between the valve core 6 and the guide rod 7. The sealing ring 9 can effectively fill the tiny gap between the valve core 6 and the guide rod 7 and prevent hydraulic oil from leaking from these gaps during the movement of the valve core 6.

[0024] The piston rod of the cylinder 2 passes through the valve housing 3 and is connected to the valve core 6. A sealing ring is provided at the point where the piston rod passes through the valve housing 3. The sealing ring at the point of penetration can effectively prevent hydraulic oil leakage.

[0025] The valve housing 3 is provided with a movable groove 10 and a sliding plate 11 is slidably connected in the movable groove 10. One side of the sliding plate 11 is connected to the valve core 6, and a spring 12 is connected between the sliding plate 11 and the valve housing 3.

[0026] The pipe 4 is equipped with a filter screen 14, which continuously filters and intercepts impurity particles in the hydraulic oil, ensuring a clean working environment for the hydraulic system.

[0027] In the initial state, the valve core 6 of the pneumatically controlled hydraulic directional valve is in the initial position, allowing hydraulic oil to flow in the pipe 4 and hydraulic flow channel 5 of the valve body 3 according to the preset oil path to meet the current working requirements of the hydraulic system. When an external pneumatic control signal is received, compressed air quickly enters the cylinder 2 in the U-shaped fixed frame 1 and acts on the pneumatic piston rod in the cylinder 2. The pneumatic piston rod is displaced by the force, which can drive the valve core 6 to move in the hydraulic flow channel 5.

[0028] During the movement of the valve core 6, the two sets of guide rods 7 of the guide assembly precisely guide the movement direction of the valve core 6. The two ends of the valve core 6 are slidably sleeved on the surface of the guide rods 7. The balls 8 inside the valve core 6 contact the guide rods 7 and roll smoothly under the push of air pressure, ensuring that the valve core 6 moves smoothly and maintaining a good seal between the valve core 6 and the valve seat. At the same time, the movable groove 10, the slide plate 11 and the spring 12 in the valve body 3 work together. When the valve core 6 starts to move to adjust the oil flow direction, the valve core 6 pushes the slide plate 11 to squeeze the spring 12 in the movable groove 10, so that the valve core 6 can move smoothly. When the valve core 6 moves, it can open or close several pipes 4, thereby realizing the smooth switching of the hydraulic oil flow direction.

[0029] Throughout the entire hydraulic oil circulation process, the filter screen 14 inside the pipeline 4 continuously filters the hydraulic oil. When the hydraulic oil flows from the pipeline 4 into the valve body 3, impurity particles are intercepted by the filter screen 14. The filtered and clean hydraulic oil can be discharged through the oil outlet pipe connected to the valve body 3 and enter the subsequent hydraulic flow channel 5 and the actuator, thereby ensuring a clean working environment for the hydraulic system and maintaining the stable operation of the system.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pneumatically controlled hydraulic directional valve, characterized in that, include: A U-shaped fixing frame (1) is provided with a cylinder (2) inside the U-shaped fixing frame (1) and a valve housing (3) is connected to one side of the U-shaped fixing frame (1). Several pipes (4) for hydraulic oil flow are connected inside the valve housing (3). A hydraulic flow channel (5) is provided in the middle of the valve housing (3) and a valve core (6) for sealing the pipes (4) is slidably connected inside the hydraulic flow channel (5). A guide assembly for enhancing the movement of the valve core (6) and the sealing stability is provided inside the hydraulic flow channel (5). The movement direction of the valve core (6) is guided by two sets of guide rods (7) of the guide assembly so that when the cylinder (2) pushes the valve core (6) to move, the balls (8) inside the valve core (6) roll smoothly on the surface of the guide rods (7).

2. The pneumatically controlled hydraulic directional valve according to claim 1, characterized in that: The guide assembly includes a sealing ring (9), two sets of guide rods (7) are connected inside the valve housing (3) and the two ends of the valve core (6) are slidably sleeved on the surface of the guide rods (7). The surface of the valve housing (3) is connected with several sealing gaskets (13). Several sets of balls (8) are provided and are all slidably connected inside the valve core (6) and one end of the balls (8) is in contact with the guide rods (7).

3. The pneumatically controlled hydraulic directional valve according to claim 2, characterized in that: The sealing ring (9) is provided in several sets and is respectively located at the joint between the valve core (6) and the guide rod (7).

4. The pneumatically controlled hydraulic directional valve according to claim 1, characterized in that: The piston rod of the cylinder (2) passes through the valve housing (3) and is connected to the valve core (6), and a sealing ring is provided at the point where the piston rod passes through the valve housing (3).

5. A pneumatically controlled hydraulic directional valve according to claim 1, characterized in that: The valve housing (3) is provided with a movable groove (10) and a sliding plate (11) is slidably connected in the movable groove (10). One side of the sliding plate (11) is connected to the valve core (6), and a spring (12) is connected between the sliding plate (11) and the valve housing (3).

6. A pneumatically controlled hydraulic directional valve according to claim 1, characterized in that: The pipe (4) is equipped with a filter screen (14).

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