Proportional overflow valve capable of accurately adjusting and controlling current

Abstract

The proportional overflow valve capable of accurately adjusting and controlling the current comprises a valve body, the valve body comprises a gasket, a movable valve element, stop iron, a magnetic conductive pipe and a pilot valve element, a stepped hole is formed in the movable valve element, an air channel communicated with the stepped hole is formed in the side, close to the pilot valve element, of the movable valve element, and an adjusting nail is connected into the stepped hole; compared with the prior art that the dimensional accuracy of parts is strictly controlled, according to the technical scheme, the adjusting nail is connected in the movable valve element, the receding groove is formed in the movable valve element, the requirement for the dimensional accuracy of the parts is lowered, machining can be achieved through common equipment, the process is simplified, and the difficulty is lowered. The machining requirements of all parts are simple, the equipment investment and the machining time are saved, for example, threaded connection is standardized, the machining cost of the adjusting nail and the stepped hole is reduced, tool groove forming and thread glue coating procedures are simple and convenient, the cost is low, adjustment is convenient, after a product is assembled, an operator can accurately change the air gap by rotating the adjusting nail in threaded connection in the stepped hole, and professional training is not needed.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic transmission, and particularly relates to a proportional overflow valve capable of precisely adjusting and controlling current. Background Art

[0002] Traditional proportional overflow valves mainly rely on strictly controlling the dimensions of parts to adjust the air gap between the moving iron core and the stop iron to control the current. However, the machining of parts is affected by equipment accuracy, process level, and human factors, making it difficult to ensure that the dimensions of each part reach the ideal accuracy. The cumulative dimension deviation results in a large error between the air gap and the design value, which not only increases the machining difficulty but also raises the scrap rate and production cost. Moreover, in actual use, external factors such as equipment vibration, temperature change, and hydraulic oil pollution are likely to change the air gap. Once the air gap of the existing valve deviates, it is necessary to reprocess or replace parts for adjustment, which is time-consuming and laborious, leading to long-term shutdown of the equipment and seriously affecting production efficiency. And due to the lack of an effective fine-tuning mechanism, it is difficult to accurately restore the air gap after readjustment, resulting in a reduction in the adjustment accuracy of the control current. Summary of the Invention

[0003] To solve the problems raised in the above background art, the present invention provides the following technical solution: A proportional overflow valve capable of precisely adjusting and controlling current, including a valve body, the valve body includes a gasket, a moving spool, a stop iron, a magnetic conducting tube, and a pilot spool. A stepped hole is opened in the moving spool, and an air passage communicating with the stepped hole is opened on one side of the moving spool adjacent to the pilot spool. An adjusting screw is connected in the stepped hole, and the end of the adjusting screw abuts against the pilot spool.

[0004] Further, the adjusting screw is threadedly connected in the stepped hole.

[0005] Further, a tool groove is opened at one end of the adjusting screw away from the pilot spool.

[0006] Further, thread sealant is applied at the connection between the adjusting screw and the stepped hole.

[0007] Further, a clearance groove is opened at one end of the moving spool adjacent to the pilot spool, and the clearance groove is connected to the stepped hole.

[0008] The beneficial effects of the present invention are as follows: Different from the prior art which strictly controls the dimensional accuracy of parts, in this technical solution, an adjusting screw is connected inside the moving spool and a clearance groove is provided, reducing the requirement for the dimensional accuracy of parts. It can be processed by ordinary equipment, simplifying the process and reducing the difficulty. The processing requirements for each component are simple, saving equipment investment and processing time. For example, the standardization of threaded connections reduces the processing costs of the adjusting screw and the stepped hole. The operation of providing a tool groove and applying thread sealant is simple and low-cost. The processing and maintenance costs are much lower than those of the prior art. In terms of adjustment, after the product is assembled, the operator can accurately change the air gap by rotating the adjusting screw connected by internal threads in the stepped hole without professional training. The tool groove facilitates positioning and the use of tools, and the clearance groove avoids interference, improving the adjustment efficiency and accuracy. In terms of control accuracy and stability, when assembling the valve body, the air gap is initially set with a gasket. After rotating the adjusting screw to finely adjust the position of the pilot spool, thread sealant is applied to fix it, eliminating manufacturing errors. Products of different batches achieve highly consistent control accuracy through a stable structure. Under long-term complex working conditions, the thread sealant prevents the adjusting screw from loosening and maintains the precise air gap, while the prior art requires frequent maintenance and adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a perspective view of the present invention;

[0010] Figure 2 is a front view of the present invention;

[0011] Figure 3 is Figure 2 a schematic cross-sectional view taken along the A-A direction in

[0012] Figure 4 is Figure 3 an enlarged view of part B in

[0013] The meanings of the reference numerals in the drawings: 1 - gasket; 2 - moving spool; 3 - stop iron; 4 - magnetic conducting tube; 5 - pilot spool; 6 - stepped hole; 7 - air passage; 8 - adjusting screw; 9 - tool groove; 10 - clearance groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0015] Please refer to Figures 1-4, the present invention provides the following technical solution: A proportional overflow valve capable of precisely adjusting and controlling current, comprising a valve body, the valve body includes a gasket 1, a moving spool 2, a stop iron 3, a magnetic conduction tube 4, and a pilot spool 5. A stepped hole 6 is formed in the moving spool 2. An air passage 7 communicating with the stepped hole 6 is formed on one side of the moving spool 2 adjacent to the pilot spool 5. An adjusting screw 8 is connected in the stepped hole 6, and the end of the adjusting screw 8 abuts against the pilot spool 5.

[0016] With the above structure, compared with the prior art, the adjusting screw 8 is simple to process. In the prior art, the dimensional accuracy of each part needs to be strictly controlled, the processing difficulty is large and errors are easily generated; while this structure has relatively lower requirements for the dimensional accuracy of parts, does not require particularly high processing accuracy, and greatly saves the processing cost. This structure can flexibly adjust the air gap after product assembly, making up for the problem of inaccurate air gap caused by manufacturing deviations of parts. Among different batches of products, with this stable structure, a highly consistent control accuracy can be achieved, effectively improving the product quality and performance stability.

[0017] In this embodiment, the adjusting screw 8 is threadedly connected in the stepped hole 6.

[0018] With the above structure, in the prior art, if the air gap needs to be adjusted, it often requires reprocessing parts or replacing components, resulting in increased costs and long time consumption. In this technical solution, with the threaded connection method, the operator can directly rotate the adjusting screw 8 precisely to change the air gap on the assembled product. This operation is simple and does not require professional skill training. Moreover, due to the standardized characteristics of the threaded connection, the processing costs of the adjusting screw 8 and the stepped hole 6 are low. In different product applications, the stability of the threaded connection ensures a high degree of consistency in adjusting the air gap and controlling the current accuracy, significantly superior to the prior art in terms of the flexibility of air gap adjustment and cost control.

[0019] In this embodiment, a tool groove 9 is formed at one end of the adjusting screw 8 away from the pilot spool 5.

[0020] With the above structure, the prior art lacks a convenient auxiliary design for air gap adjustment, resulting in a complex and inefficient adjustment process. In this technical solution, only a simple processing procedure is required. With the help of the tool groove 9, the operator can quickly locate and use a special tool to rotate the adjusting screw 8 efficiently and precisely, greatly improving the adjustment efficiency and accuracy. In large-scale production, this design ensures the operation consistency of each product in the adjustment link, and thus ensures a high degree of consistency in the control current accuracy of different products, overcoming the deficiencies of the prior art in terms of adjustment convenience and accuracy consistency.

[0021] In this embodiment, thread sealant is applied at the connection between the adjusting screw 8 and the stepped hole 6.

[0022] With the above structure, this technical solution is simple and low-cost to operate by applying thread sealant, yet it can provide reliable anti-loosening protection for the adjusting screw 8. During long-term use, the thread sealant ensures that the adjusting screw 8 is always fixed in the set position, maintaining an accurate air gap and ensuring that the proportional overflow valve stably and precisely adjusts the control current. Different products can achieve stable control accuracy relying on the thread sealant under complex working conditions, while the prior art requires frequent maintenance and adjustment. This technical solution shows obvious advantages in terms of the stability of control accuracy and maintenance cost.

[0023] In this embodiment, an avoidance groove is provided at one end of the moving spool 2 adjacent to the pilot spool 5, and the avoidance groove is connected to the stepped hole 6.

[0024] With the above structure, the processing of the avoidance groove is simple and can be achieved by ordinary processing techniques. The avoidance groove creates sufficient space for the installation and adjustment of the adjusting screw 8, effectively avoiding interference from other structures of the moving spool 2, enabling the adjusting screw 8 to rotate smoothly, and greatly improving the accuracy and efficiency of adjustment.

[0025] Working principle: During valve body assembly, place the gasket 1 between the moving spool 2 and the stop iron 3, and put the gasket 1 in the magnetic conduction tube 4 to clamp the air gap gasket 1 between the stop iron 3 and the moving spool 2 to initially set the air gap. Then, use a tool to rotate the adjusting screw 8 threadedly connected in the stepped hole 6 of the moving spool 2. The end of the adjusting screw 8 abuts against the pilot spool 5. By rotating the adjusting screw 8, fine adjustment of the position of the pilot spool 5 is achieved, thereby precisely controlling the size of the air gap. After the adjustment is completed, apply thread sealant at the connection between the adjusting screw 8 and the stepped hole 6 to fix the adjusting screw 8 and prevent loosening; thus, manufacturing errors are eliminated and the air gap is precisely controlled.

[0026] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A proportional relief valve capable of accurately adjusting the control current, comprising a valve body, the valve body comprising a gasket, a movable valve core, a stopper, a magnetic tube, and a pilot valve core, wherein a stepped hole is provided in the movable valve core, and characterized in that: An air passage communicating with the stepped hole is provided on one side of the movable valve core adjacent to the pilot valve core. An adjusting pin is connected in the stepped hole, and an end of the adjusting pin abuts against the pilot valve core.

2. A proportional relief valve capable of accurately adjusting control current according to claim 1, characterized in that: The adjusting pin is threadedly connected in the stepped hole.

3. A proportional relief valve capable of accurately adjusting control current according to claim 1, characterized in that: A tool groove is formed at one end of the adjusting pin away from the pilot valve core.

4. A proportional relief valve capable of accurately adjusting control current according to claim 1, characterized in that: Thread glue is applied at the connection between the adjusting pin and the stepped hole.

5. A proportional relief valve capable of accurately adjusting control current according to claim 1, characterized in that: An air avoidance groove is provided at one end of the movable valve core adjacent to the pilot valve core, and the air avoidance groove is connected to the stepped hole.

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