An adjustable limit joint and a multi-way valve

Abstract

The utility model discloses an adjustable limit joint belongs to hydraulic system technical field, solves the inconvenient problem of adjusting screw adjustment in existing multiway valve. It includes direct head, lock screw and screw rod, the direct head, lock screw and screw rod all are hollow structure, the lock screw, screw rod are connected in direct head along oil flow direction in proper order, and the inner wall of lock screw is polygonal hole, and the one end of screw rod is equipped with polygonal groove close to lock screw. The adjustable limit joint of the utility model still can make limit joint and pilot port keep sealed after adjusting, effectively avoid the problem of oil leakage. The utility model further provides a kind of multiway valve, by increasing adjustable limit joint, change the maximum output flow of multiway valve vane, can adapt to the matching requirement of different attribute.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic system technology, and more specifically, to an adjustable limit joint and a multi-way valve. Background Technology

[0002] Different attachments on excavators require different flow rates. Some attachments, especially those with thumb clamps, require very low flow rates. These attachments are typically controlled by on / off solenoid valves, which, with conventional high flow rates, become too fast and difficult to control, resulting in poor operability. Currently, there are two solutions to this problem. One is to replace the on / off solenoid valve with a proportional pressure-reducing solenoid valve, along with a proportional control pilot handle, to achieve proportional flow control. However, this solution requires a proportional control design from the outset, making later modifications relatively complicated, and the entire proportional pressure-reducing valve and control handle are very expensive. The other solution is a multi-way valve on the excavator, which has an adjustable valve core stroke function. This means that the end caps on both ends of the multi-way valve have adjustable valve core stroke. The maximum stroke of the valve core can be limited by the adjusting screws on the end caps, thereby adjusting the maximum flow rate. Currently, when adjusting the screws, axial displacement occurs between the adjusting screw and the pilot port. After adjustment, the sealing ring between the adjusting screw and the pilot port may disengage, relying solely on the threaded seal, resulting in poor sealing and a tendency for oil leakage.

[0003] Therefore, there is an urgent need to design an adjustable limit connector and a multi-way valve to solve the above problems. Utility Model Content

[0004] The technical problem to be solved by this utility model is to address the above-mentioned shortcomings of the prior art. One of the objectives of this utility model is to provide an adjustable limiting connector that can still keep the limiting connector and the pilot port sealed after adjustment, effectively avoiding the problem of oil leakage.

[0005] The second purpose is to provide a multi-way valve, which can be adapted to the matching requirements of different attachments by adding an adjustable limit joint to change the maximum output flow of the multi-way valve plate.

[0006] The technical solution of this utility model is as follows: an adjustable limiting connector includes a direct head, a set screw and a screw rod. The direct head, set screw and screw rod are all hollow structures. The set screw and screw rod are sequentially threaded into the direct head along the oil flow direction. The inner wall of the set screw is a polygonal hole, and the end of the screw rod near the set screw is provided with a polygonal groove.

[0007] As a further improvement, the outer wall of the direct head is provided with a first external thread, a rotating part, and a second external thread in sequence along the oil flow direction.

[0008] Furthermore, annular grooves are provided between the first external thread, the second external thread and the rotating part.

[0009] Furthermore, the rotating part is an external hexagonal head or a blind hole radially opened on the outer wall of the direct head.

[0010] Furthermore, the inner wall of the direct head is provided with a flared opening and an internal thread in sequence along the oil flow direction.

[0011] Furthermore, the cross-sections of the polygonal holes and polygonal grooves are all quadrilateral, pentagonal, or hexagonal.

[0012] The second technical solution of this utility model is as follows: a multi-way valve, including the above-mentioned adjustable limit joint, there are two adjustable limit joints, and the two adjustable limit joints are respectively installed at the pilot ports at both ends of the multi-way valve body, and the adjustable limit joints are connected to the pilot ports.

[0013] As a further improvement, the adjustable limiting connector is detachably connected to the pilot port.

[0014] Furthermore, a sealing ring is provided between the adjustable limiting connector and the pilot port.

[0015] Beneficial effects Compared with the prior art, the advantages of this utility model are as follows: This utility model's adjustable connector uses a set screw and a screw rod connected to the internal thread of the direct head. During adjustment, the set screw is first rotated to loosen it, causing it to retract and loosen the screw rod. Then, the screw rod is rotated to move forward or backward, thus adjusting the distance between the screw rod end face and the valve core. Finally, the set screw is rotated back to its original position, tightening the screw rod. During the adjustment process, the direct head remains stationary, ensuring a seal between the direct head and the pilot port after adjustment, effectively preventing oil leakage. Furthermore, the screw rod is tightened by the set screw to prevent loosening due to oil impact, further ensuring the accuracy of the multi-way valve. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the direct head structure in this utility model; Figure 3 This is a schematic diagram of the screw structure in this utility model; Figure 4 This is a schematic diagram of the set screw in this utility model; Figure 5 This is a schematic diagram of the structure of the multi-way valve in this utility model; Figure 6 for Figure 5 A magnified schematic diagram of the structure at point A in the middle.

[0017] Wherein: 1-Direct head, 2-Set screw, 3-Screw, 4-Polygonal hole, 5-Polygonal groove, 6-Multi-way valve body, 7-Pilot port, 8-Sealing ring, 9-Valve core, 11-First external thread, 12-Rotating part, 13-Second external thread, 14-Annular groove, 15-Bell mouth, 16-Internal thread. Detailed Implementation

[0018] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0019] See Figure 1-4 As shown, an adjustable limiting connector of this utility model includes a direct head 1, a set screw 2, and a screw rod 3. The direct head 1, the set screw 2, and the screw rod 3 are all hollow structures to facilitate oil passage. The set screw 2 and the screw rod 3 are sequentially threaded into the direct head 1 along the oil flow direction. The inner wall of the set screw 2 has a polygonal hole 4 to facilitate rotation of the set screw 2. A polygonal groove 5 is provided at the end of the screw rod 3 near the set screw 2 to facilitate rotation of the screw rod 3.

[0020] This utility model's adjustable connector uses a set screw 2 and a screw rod 3 connected to the internal thread of the direct head 1. During adjustment, the set screw 2 is first rotated to loosen it, causing it to retract and loosen the screw rod 3. Then, the screw rod 3 is rotated to move forward or backward, thus adjusting the distance between the end face of the screw rod 3 and the valve core 9. Finally, the set screw 2 is rotated back to its original position, tightening the screw rod 3. During the adjustment process, the direct head 1 remains stationary, ensuring that the direct head 1 and the pilot port 7 remain sealed after adjustment, effectively preventing oil leakage. Furthermore, the screw rod 3 is tightened by the set screw 2, preventing loosening due to oil impact, further ensuring the accuracy of the multi-way valve.

[0021] Preferably, the outer wall of the direct head 1 is provided with a first external thread 11, a rotating part 12, and a second external thread 13 in sequence along the oil flow direction. The first external thread 11 can be connected to the oil pipe, the rotating part 12 is used to rotate the direct head 1 to facilitate the installation of the entire connector, and the second external thread 13 is used to connect to the pilot port 7 of the multi-way valve to achieve detachable installation.

[0022] Preferably, an annular groove 14 is provided between the first external thread 11, the second external thread 13 and the rotating part 12 to facilitate the installation of sealing components, such as sealing rings.

[0023] Preferably, the rotating part 12 is an external hexagonal head or a blind hole radially opened on the outer wall of the direct head 1. The external hexagonal head structure makes it easy to rotate with a wrench, while the blind hole structure makes it easy to rotate with a screwdriver.

[0024] Preferably, the inner wall of the direct head 1 is provided with a flared mouth 15 and an internal thread 16 in sequence along the oil flow direction. The flared mouth 15 facilitates the connection of the oil pipe, while the internal thread 16 enables the installation of the set screw 2 and the screw 3.

[0025] Preferably, the cross-sections of the polygonal hole 4 and the polygonal groove 5 are quadrilateral, pentagonal, or hexagonal. In this embodiment, a hexagonal structure is preferred to facilitate the use of an internal hexagon head to rotate the set screw 2 or the screw 3.

[0026] like Figure 5-6 This embodiment also provides a multi-way valve, including the aforementioned adjustable limit connector. There are two adjustable limit connectors, and the two adjustable limit connectors are respectively installed at the pilot ports 7 at both ends of the multi-way valve body 6. The adjustable limit connectors are connected to the pilot ports 7.

[0027] In practical use, the adjustable limit connector on the left side of the multi-way valve is connected to the oil pipe. Hydraulic pilot oil pushes the valve core 9 from the left to the right, activating the adjustable limit connector on the right. The extension length of the screw 3 limits the rightward sliding stroke of the valve core 9. Since there is no pilot oil on the right side, the connector on the right can be used without connecting the oil pipe. An Allen wrench can be directly inserted into the connector for adjustment, allowing for simultaneous flow testing and adjustment, which is convenient. The adjustment on the other side follows the same method.

[0028] Preferably, the adjustable limit connector is detachably connected to the pilot port 7 for easy disassembly and maintenance. In this embodiment, the direct head 1 is threadedly connected to the pilot port 7 to achieve detachable installation. In other embodiments, the direct head 1 can also be fixed with bolts.

[0029] Preferably, a sealing ring 8 is provided between the adjustable limit joint and the pilot port 7 to ensure that the adjustable limit joint and the pilot port 7 are always sealed.

[0030] The above are merely preferred embodiments of this utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these will not affect the implementation effect of this utility model or the practicality of the patent.

Claims

1. An adjustable limiting connector, characterized in that, It includes a direct head (1), a set screw (2) and a screw (3). The direct head (1), the set screw (2) and the screw (3) are all hollow structures. The set screw (2) and the screw (3) are sequentially threaded into the direct head (1) along the direction of oil flow. The inner wall of the set screw (2) is a polygonal hole (4). The end of the screw (3) near the set screw (2) is provided with a polygonal groove (5).

2. The adjustable limiting joint according to claim 1, characterized in that, The outer wall of the direct head (1) is provided with a first external thread (11), a rotating part (12), and a second external thread (13) in sequence along the oil flow direction.

3. An adjustable limiting connector according to claim 2, characterized in that, An annular groove (14) is provided between the first external thread (11), the second external thread (13) and the rotating part (12).

4. An adjustable limiting connector according to claim 2, characterized in that, The rotating part (12) is an external hexagonal head or a blind hole radially opened on the outer wall of the direct head (1).

5. An adjustable limiting connector according to claim 2, characterized in that, The inner wall of the direct head (1) is provided with a flared mouth (15) and an internal thread (16) in sequence along the oil flow direction.

6. An adjustable limiting connector according to claim 1, characterized in that, The cross-sections of the polygonal hole (4) and polygonal groove (5) are all quadrilateral, pentagonal or hexagonal.

7. A multi-way valve, characterized in that, The adjustable limit connector includes any one of the above claims 1-6, there are two adjustable limit connectors, and the two adjustable limit connectors are respectively installed at the pilot ports (7) at both ends of the multi-way valve body (6), and the adjustable limit connectors are connected to the pilot ports (7).

8. A multi-way valve according to claim 7, characterized in that, The adjustable limit connector is detachably connected to the pilot port (7).

9. A multi-way valve according to claim 7, characterized in that, A sealing ring (8) is provided between the adjustable limiting connector and the pilot port (7).

Images