Displacement control valve with mechanical limit for agricultural machinery pump

Abstract

The utility model discloses a displacement control valve with a mechanical limiting function for an agricultural machine pump. The displacement control valve comprises a rotating shaft, a valve body and a reset mechanism arranged in the valve body. And the end part of the rotating shaft is rotatably inserted into the valve body and is linked with the reset mechanism. The valve body is provided with a limiting matching part at the position corresponding to the rotating shaft, and the limiting matching part and the limiting matching part are matched to limit the rotating angle of the rotating shaft. The limiting component and the limiting matching part are arranged on the rotating shaft and the valve body, so that the rotating angle of the rotating shaft is effectively limited, displacement control is more accurate, the working stability and reliability of an agricultural machine pump are improved, the requirement of agricultural machine operation for accurate displacement control can be better met, and the displacement control valve is simple in structure and convenient to maintain and apply.

Description

Technical Field

[0001] The utility model relates to a valve, more particularly to a displacement control valve with mechanical limit for an agricultural machinery pump. Background Art

[0002] Currently, most agricultural machinery relies on a closed system consisting of a closed pump and motor to control movement. For example, the utility model patent with announcement number CN219774472U, titled "A Displacement Control Valve for an Agricultural Machinery Pump," is composed of a valve body, a valve chamber, a delivery channel, a reset mechanism, and an adjustment component. During use, the handle is turned to drive the rotating shaft to rotate, causing the limit rod to displace, opening the delivery channel and realizing fluid delivery.

[0003] However, during the use of agricultural machinery, the rotating shaft of the displacement control valve on the closed pump is occasionally subjected to excessive external force, causing the rotating shaft to rotate at an angle exceeding the expected design angle. When the angle exceeds too large, the rotating shaft will drive the torsion spring to hit the inner wall of the pump, which will not only damage the inner wall of the pump, but also cause the torsion spring to deform after long-term operation, thereby affecting the performance of the displacement control valve. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a displacement control valve with mechanical limit for agricultural machinery pumps, so as to solve the above technical problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a displacement control valve with a mechanical limiter for an agricultural pump, comprising a rotating shaft, a valve body, and a reset mechanism disposed within the valve body. The end of the rotating shaft is rotatably inserted into the valve body and interlocks with the reset mechanism. The rotating shaft is provided with a limiter component, and the valve body is provided with a limiter mating portion relative to the rotating shaft. The limiter mating portion and the limiter component cooperate to limit the rotation angle of the rotating shaft.

[0006] As a further improvement of the present invention, the limiting component is a limiting block, which is sleeved on the rotating shaft and rotates with the rotation of the rotating shaft. The limiting matching part is a limiting groove opened on the valve body, and the limiting block is accommodated in the limiting groove. When the side of the limiting block rotates to the point where it contacts the limiting groove, the rotation angle of the rotating shaft is limited.

[0007] As a further improvement of the present invention, the cross-section of the limit block is rectangular, and chamfers are provided at the four corners of the rectangle. The limit groove is a rectangular structure with an opening at the bottom. The width of the limit block is smaller than the width of the limit groove, the length of the limit block is smaller than the length of the limit groove, and the length of the limit block is greater than the width of the limit groove.

[0008] As a further improvement of the present invention, a key slot hole is opened in the middle of the limit block, and a key is processed on the rotating shaft. When the limit block is sleeved on the rotating shaft, the key and the key slot hole cooperate with each other.

[0009] As a further improvement of the present invention, a mounting ring groove is provided on the rotating shaft near the limit block, and a retaining ring is coaxially sleeved on the mounting ring groove. The end face of the retaining ring abuts against the limit block to axially fix the limit block on the rotating shaft.

[0010] As a further improvement of the present invention, the two corners of the limiting groove away from the opening are provided with rounded corners.

[0011] The beneficial effects of the present utility model are as follows: by providing a limiting component on the rotating shaft and providing a matching limiting portion on the valve body, the rotation angle of the rotating shaft is effectively limited, thus avoiding the problems in the prior art caused by excessively large angles. The utility model replaces the original manual variable control valve and, when used on agricultural machinery, enables the agricultural machinery to have a mechanical limiting function, greatly improving the safety and practicality of the agricultural machinery. The design of the limiting block and the limiting groove, such as the specific shape and size of the limiting block and the connection method with the rotating shaft, can effectively realize the setting of the limiting angle of the rotating shaft. It effectively solves a series of problems caused by excessive rotation of the rotating shaft in traditional displacement control valves, improves the reliability and service life of displacement control valves for agricultural machinery pumps, ensures the stable operation of agricultural machinery, and meets the requirements of agricultural production for the stability and durability of agricultural machinery components. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a front structural diagram of a displacement control valve with mechanical limit for an agricultural machinery pump according to the present utility model;

[0013] Figure 2 This is a side structural diagram of a displacement control valve with mechanical limit for an agricultural machinery pump according to the present utility model;

[0014] Figure 3 This is a schematic diagram of the state of the displacement control valve with mechanical limit for agricultural machinery pumps of the present invention when it is limited;

[0015] Figure 4 for Figure 1 Schematic diagram of the structure of the transmission shaft. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0017] Reference Figure 1As shown, the displacement control valve with mechanical limit for agricultural machinery pumps of this embodiment includes a rotating shaft 19, a valve body 1, and a reset mechanism disposed within the valve body 1. The end of the rotating shaft 19 is rotatably inserted into the valve body 1 and is linked to the reset mechanism. A limit member 10 is provided on the rotating shaft 19, and a limit fitting portion is provided on the valve body 1 relative to the rotating shaft 19. The limit fitting portion and the limit member 10 cooperate to limit the rotation angle of the rotating shaft 19. As the rotating shaft 19 rotates, the limit member 10 rotates accordingly. When the rotation reaches its maximum angle, the limit member 10 contacts the limit fitting portion, preventing further rotation of the rotating shaft 19, thereby limiting its rotation angle. Compared to the prior art, in which the rotating shaft is easily pushed beyond the expected angle due to excessive external force, resulting in impact with the inner wall of the pump and damage to the torsion spring, affecting performance, this solution effectively prevents excessive rotation of the rotating shaft 19 by providing the limit member 10 and the limit fitting portion, thereby protecting the pump body and internal components.

[0018] Further, refer to Figure 1 and Figure 2 As shown, the limiting component 10 is a limiting block, which is sleeved onto the rotating shaft 19 and rotates as the rotating shaft 19 rotates. The limiting mating portion is a limiting groove provided on the valve body 1. The limiting block is accommodated in the limiting groove. When the side of the limiting block rotates until it contacts the limiting groove, the rotation angle of the rotating shaft 19 is limited. The rotating shaft 19 drives the limiting block to rotate within the limiting groove. When the side of the limiting block hits the wall of the limiting groove, the rotating shaft 19 cannot continue to rotate. Using this structure to achieve limiting, the overall structure is simple, easy to process, and more durable.

[0019] Further, refer to Figure 1 and Figure 2 As shown, the cross section of the limit block is rectangular, and chamfers are provided at the four corners of the rectangle. The limit slot is a rectangular structure with an opening at the bottom. The width of the limit block is smaller than the width of the limit slot, the length of the limit block is smaller than the length of the limit slot, and the length of the limit block is greater than the width of the limit slot. This size design allows the limit block to have a certain rotation space within the limit slot and effectively block the rotation of the rotating shaft 19 when reaching the limit position, ensuring a reliable limit function. The maximum angle of the limit can be changed by adjusting the difference between the width of the limit slot and the length of the limit block. The larger the difference between the two, the smaller the limit angle, and the smaller the difference, the larger the limit angle.

[0020] Further, refer to Figure 3 As shown, a key slot is provided in the middle of the stop block, and a key is machined on the rotating shaft 19. When the stop block is sleeved on the rotating shaft 19, the key and the key slot engage with each other. The engagement of the key and the key slot ensures that the stop block and the rotating shaft 19 rotate synchronously, ensuring accurate positioning and preventing relative slippage between the stop block and the rotating shaft 19, which could affect the positioning effect.

[0021] Further, refer to Figure 1 and Figure 3 As shown, a mounting annular groove 191 is formed on the rotating shaft 19 near the stop block. A retaining ring 18 is coaxially sleeved on the mounting annular groove 191. The end surface of the retaining ring 18 abuts against the stop block to axially fix the stop block on the rotating shaft 19. This structure prevents the stop block from axially moving on the rotating shaft 19, ensuring that the stop block is always in the correct position to perform its limiting function.

[0022] Further, refer to Figure 1 and Figure 2 As shown, the two corners of the limit groove away from the opening are rounded. By setting the rounded corners, the processing of the limit groove can be effectively facilitated, and foreign matter is not easily stuck in the two corners of the limit groove.

[0023] In summary, this solution effectively limits the rotation angle of the rotating shaft by providing a limiting component and a limiting matching portion, thereby avoiding the problem of damage to the inner wall of the pump and affecting the performance of the torsion spring due to excessive rotation of the rotating shaft.

[0024] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A displacement control valve with mechanical limit for an agricultural pump, comprising a rotating shaft (19), a valve body (1), and a reset mechanism disposed in the valve body (1), wherein the end of the rotating shaft (19) is rotatably inserted into the valve body (1) and is linked to the reset mechanism, and is characterized in that: A limiting component (10) is provided on the rotating shaft (19), and a limiting fitting portion is provided on the valve body (1) at a position relative to the rotating shaft (19). The limiting fitting portion cooperates with the limiting component (10) to limit the rotation angle of the rotating shaft (19).

2. The displacement control valve with mechanical limit for agricultural machinery pump according to claim 1, characterized in that: The limiting component (10) is a limiting block, which is sleeved on the rotating shaft (19) and rotates as the rotating shaft (19) rotates. The limiting matching portion is a limiting groove provided on the valve body (1), and the limiting block is accommodated in the limiting groove. When the side of the limiting block rotates to abut against the limiting groove, the rotation angle of the rotating shaft (19) is limited.

3. The displacement control valve with mechanical limit for agricultural machinery pump according to claim 2, characterized in that: The cross-section of the limit block is rectangular, and chamfers are provided at the four corners of the rectangle. The limit groove is a rectangular structure with an opening at the bottom. The width of the limit block is smaller than the width of the limit groove, the length of the limit block is smaller than the length of the limit groove, and the length of the limit block is greater than the width of the limit groove.

4. The displacement control valve with mechanical limit for agricultural machinery pump according to claim 3, characterized in that: A key slot hole is provided in the middle of the limit block, and a key is machined on the rotating shaft (19). When the limit block is sleeved on the rotating shaft (19), the key and the key slot hole cooperate with each other.

5. The displacement control valve with mechanical limit for agricultural machinery pump according to any one of claims 2 to 4, characterized in that: A mounting ring groove (191) is provided on the rotating shaft (19) at a position close to the limit block. A retaining ring (18) is coaxially sleeved on the mounting ring groove (191). The end face of the retaining ring (18) abuts against the limit block to axially fix the limit block on the rotating shaft (19).

6. The displacement control valve with mechanical limit for agricultural machinery pump according to any one of claims 3 or 4, characterized in that: The limiting groove has rounded corners at two corners away from the opening.

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