阅读说明：本技术 一种先导控制阀及其装配工艺 (Pilot control valve and assembly process thereof ) 是由 张文 陈龙 陶腾飞 陈晓东 于 2020-06-09 设计创作，主要内容包括：本发明一种先导控制阀及其装配工艺,步骤为：步骤1、部件加工,其中阀体(1.1)的加工步骤为：在筒状加工件的外表面铣出环装结构的隔磁槽,通过数字化智能脉冲焊机将铝青铜焊丝焊置于隔磁槽内形成隔磁环,该隔磁环的焊接表面呈金黄色的均匀鱼鳞纹；步骤2、阀体组件(1)装配；步骤3、控制阀组件(3)竖向装配；步骤4、步骤2中制得的半成品阀体组件(1)于控制阀组件(3)相连接；步骤5、调节弹簧(1.3)和调节螺栓(1.5)装配；步骤6、线圈组件(2)及锁紧螺母(4)装配。本发明一种先导控制阀及其装配工艺,其优化了密封结构,结合全新的装配工艺,极大的提高了产品质量和装配效率,有利于提高产品的市场竞争力。(The invention relates to a pilot control valve and an assembly process thereof, which comprises the following steps: step 1, processing parts, wherein the processing steps of the valve body (1.1) are as follows: milling a magnetism isolating groove with an annular structure on the outer surface of the cylindrical workpiece, and welding an aluminum bronze welding wire in the magnetism isolating groove by a digital intelligent pulse welding machine to form a magnetism isolating ring, wherein the welding surface of the magnetism isolating ring is golden uniform fish scale pattern; step 2, assembling the valve body assembly (1); step 3, vertically assembling the control valve assembly (3); step 4, connecting the semi-finished valve body assembly (1) prepared in the step 2 with the control valve assembly (3); step 5, assembling an adjusting spring (1.3) and an adjusting bolt (1.5); and 6, assembling the coil assembly (2) and the locking nut (4). According to the pilot control valve and the assembly process thereof, the sealing structure is optimized, the brand-new assembly process is combined, the product quality and the assembly efficiency are greatly improved, and the market competitiveness of the product is favorably improved.)

1. The utility model provides a pilot control valve, includes valve body subassembly (1), and valve body subassembly (1) overcoat is equipped with coil pack (2), its characterized in that: a step hole is arranged in the valve body (1.1) of the valve body assembly (1) along the radial direction of the valve body assembly, an adjusting spring (1.3) is positioned in the small-bore end of the step hole, and a movable iron core (1.2) is positioned in the large-bore end of the step hole;

a valve sleeve (3.1) of the control valve component (3) is connected with the valve body (1.1), a valve core (3.2) is movably arranged in the valve sleeve (3.1), a pilot hole is arranged at the center of the valve core (3.2) along the radial direction of the valve core, a thimble (3.3) is arranged in the pilot hole in a sliding manner, a pilot spring (3.4) is sleeved at one end of the thimble (3.3) extending out of the valve core (3.2), and the thimble (3.3) is abutted against the movable iron core (1.2); the end part of the valve core (3.2) is inserted into the oil outlet of the valve sleeve (3.1) after the diameter of the valve core conical sealing surface (3.2.1) is reduced, an oil outlet channel with an annular structure is formed between the end part of the valve core (3.2) and the inner wall of the oil outlet of the valve sleeve (3.1), and the end part of the oil outlet of the valve sleeve (3.1) is provided with the valve sleeve conical sealing surface (3.1.1) which is jointed and matched with the valve core conical sealing surface (3.2.1).

2. A pilot control valve as defined in claim 1, wherein: the upper part or the lower part of the valve sleeve conical sealing surface (3.1.1) is convexly provided with a convex ring (3.1.2), and the upper part of the valve core conical sealing surface (3.2.1) is provided with a sealing strip (3.2.2) with an annular structure.

3. A pilot control valve as defined in claim 1, wherein: a through hole communicated with the pilot hole is formed in the outer wall of the valve core (3.2) along the radial direction of the valve core, a partition plate is arranged in the pilot hole to divide the pilot hole into a left pilot hole and a right pilot hole, the through hole is communicated with the left pilot hole, the right pilot hole is communicated with the oil outlet at the right end of the valve sleeve (3.1), a through hole communicated with the left pilot hole and the right pilot hole is formed in the partition plate, and the head conical section of the thimble (3.3) is inserted in the through hole; an annular oil cavity is formed between the end part of the valve core (3.2) and the inner wall of the valve sleeve (3.1), the through hole is communicated with the annular oil cavity, and an oil inlet on the valve sleeve (3.1) is communicated with the annular oil cavity.

4. A pilot control valve as defined in claim 1, wherein: the valve body (1.1) is connected with the valve sleeve (3.1) through a connecting nut (1.4).

5. A pilot control valve as defined in claim 1, wherein: the diameter of one end, extending out of the valve core (3.2), of the thimble (3.3) is increased to form a large-diameter end, the pilot spring (3.4) is sleeved on the small-diameter end, one end of the pilot spring (3.4) abuts against the step surface, and the other end of the pilot spring abuts against the valve core (3.2).

6. A pilot control valve assembly process is characterized in that: the process comprises the following steps:

step 1, processing parts, wherein the processing steps of the valve body (1.1) are as follows: milling a magnetism isolating groove with an annular structure on the outer surface of the cylindrical workpiece, and welding an aluminum bronze welding wire in the magnetism isolating groove by a digital intelligent pulse welding machine to form a magnetism isolating ring, wherein the welding surface of the magnetism isolating ring is golden uniform fish scale pattern;

step 2, the movable iron core (1.2) is wrapped by the lining cloth and then is inserted into the valve body (1.1) in a sliding mode, and then the connecting nut (1.4) is arranged on the valve body (1.1) in a rotating mode;

step 3, assembling the control valve assembly (3): after the valve sleeve (3.1) is vertically placed, the valve core (3.2) vertically slides into the valve sleeve (3.1), and the thimble (3.3) sleeved with the pilot spring (3.4) vertically slides into the valve core (3.2);

step 4, screwing the connecting nut (1.4) of the semi-finished valve body assembly (1) prepared in the step 2 on the valve sleeve (3.1) of the control valve assembly (3);

step 5, inserting an adjusting spring (1.3) into the valve body (1.1) to contact the movable iron core (1.2), and then screwing an adjusting bolt (1.5) on the valve body (1.1) to plug the adjusting spring (1.3);

and 6, after the coil assembly (2) is sleeved outside the valve body (1.1), the locking nut (4) is screwed on the valve body (1.1) to complete assembly.

7. The pilot control valve assembly process of claim 6, wherein: the lining cloth in the step 2 is made of Teflon glass fiber.

Technical Field

The invention relates to a pilot control valve and an assembly process thereof, and belongs to the technical field of electromagnetic valves.

Background

Currently, pilot control valves are auxiliary valves used for operating control mechanisms in other valves or elements, which are connected by hydraulic lines. The working principle of the pilot valve is as follows: when the valve is electrified, the movable iron core is moved by electromagnetic force, so that a pilot hole on the valve core is opened to release pressure, and then under the action of the pressure difference of oil liquid, the valve core is pushed by the oil liquid pressure to move upwards to open a main valve port; when the power is off, the thimble is reset under the action of the spring force, the pilot hole is closed, the valve core moves downwards, and the main valve port is closed. The pilot valve magnetic isolating ring structure is difficult to machine and low in efficiency in the practical application process, the production efficiency and the product quality of the pilot valve magnetic isolating ring structure are greatly influenced, meanwhile, the requirement on the sealing precision between the valve core and the oil outlet of the valve sleeve in the conventional structure is extremely high, sealing is not tight enough often due to the existence of machining errors or insufficient experience of assembly personnel, and therefore the later-period use quality of the pilot valve is influenced, and therefore the pilot control valve with the new structure and the assembly process of the pilot control valve are needed urgently.

Disclosure of Invention

The invention aims to overcome the defects and provides a pilot control valve and an assembly process thereof, which improve the structure of the pilot control valve, optimize a sealing structure, combine a brand new assembly process, greatly improve the product quality and the assembly efficiency and are beneficial to improving the market competitiveness of products.

The purpose of the invention is realized as follows:

a pilot control valve comprises a valve body assembly, wherein a coil assembly is sleeved outside the valve body assembly, a step hole is formed in the valve body of the valve body assembly along the radial direction of the valve body assembly, an adjusting spring is located in the small-bore end of the step hole, and a movable iron core is located in the large-bore end of the step hole;

a valve sleeve of the control valve component is connected with the valve body, a valve core is movably arranged in the valve sleeve, a pilot hole is arranged at the center of the valve core along the radial direction of the valve core, an ejector pin is arranged in the pilot hole in a sliding manner, a pilot spring is sleeved at one end, extending out of the valve core, of the ejector pin, and the ejector pin abuts against the movable iron core; the end part of the valve core is inserted into the oil outlet of the valve sleeve after the diameter of the end part of the valve core is reduced through the conical sealing surface of the valve core, an oil outlet channel with an annular structure is formed between the end part of the valve core and the inner wall of the oil outlet of the valve sleeve, and the end part of the oil outlet of the valve sleeve is provided with a conical sealing surface of the valve sleeve, which is attached and matched with the conical sealing surface of.

The invention relates to a pilot control valve, wherein a convex ring is convexly arranged on the upper part or the lower part of a conical sealing surface of a valve sleeve, and a sealing strip with an annular structure is arranged on the upper part of the conical sealing surface of a valve core.

The invention relates to a pilot control valve, wherein a through hole communicated with a pilot hole is arranged on the outer wall of a valve core along the radial direction of the valve core, a partition plate is arranged in the pilot hole to divide the pilot hole into a left pilot hole and a right pilot hole, the through hole is communicated with the left pilot hole, the right pilot hole is communicated with an oil outlet at the right end of a valve sleeve, a through hole communicated with the left pilot hole and the right pilot hole is arranged on the partition plate, and a head conical section of a thimble is inserted in the through hole; an annular oil cavity is formed between the end part of the valve core and the inner wall of the valve sleeve, the through hole is communicated with the annular oil cavity, and an oil inlet on the valve sleeve is communicated with the annular oil cavity.

The invention relates to a pilot control valve, wherein a valve body is connected with a valve sleeve through a connecting nut.

The diameter of one end of the thimble extending out of the valve core is increased to form a large-diameter end, the pilot spring is sleeved on the small-diameter end, one end of the pilot spring abuts against a step surface, and the other end of the pilot spring abuts against the valve core.

A pilot control valve and an assembly process thereof, the process steps are as follows:

step 1, processing parts, wherein the processing steps of the valve body are as follows: milling a magnetism isolating groove with an annular structure on the outer surface of the cylindrical workpiece, and welding an aluminum bronze welding wire in the magnetism isolating groove by a digital intelligent pulse welding machine to form a magnetism isolating ring, wherein the welding surface of the magnetism isolating ring is golden uniform fish scale pattern;

step 2, the movable iron core is wrapped by the lining cloth and then is inserted into the valve body in a sliding mode, and then the connecting nut is arranged on the valve body in a rotating mode;

step 3, assembling a control valve assembly: after the valve sleeve is vertically placed, the valve core vertically slides into the valve sleeve, and the thimble sleeved with the pilot spring vertically slides into the valve core;

step 4, screwing the connecting nut of the semi-finished valve body assembly prepared in the step 2 on a valve sleeve of the control valve assembly;

step 5, inserting an adjusting spring into the valve body to contact the movable iron core, and screwing an adjusting bolt on the valve body to plug the adjusting spring;

step 6, after the coil assembly is sleeved outside the valve body, the locking nut is screwed on the valve body to complete assembly;

and 7, detecting, and performing performance test (flow performance test, and adjusting the performance by adjusting the adjusting bolts to improve the yield of the product).

The invention relates to a pilot control valve and an assembly process thereof, wherein lining cloth in the step 2 is made of Teflon glass fiber.

Compared with the prior art, the invention has the beneficial effects that:

the manufacturing method of the valve body magnetism isolating ring is improved, so that the valve body magnetism isolating ring is processed from an integral structure, and compared with the conventional welding connection method, the strength and the concentricity are both greatly improved on the whole; the whole assembly process adopts a vertical installation mode, and is combined with an optimized threaded plug-in connection structure, so that the whole assembly is more convenient, and the assembly effect is better; finally, the improved sealing structure greatly reduces the requirement on the processing precision, and the introduction of the micro convex ring enables the combination between the valve core and the outer wall of the oil outlet of the valve sleeve to be more compact, thereby greatly improving the sealing performance.

Drawings

Fig. 1 is a schematic structural diagram of a pilot control valve according to the present invention.

Fig. 2 is a partially enlarged view (closed state) of a spool of a pilot control valve according to the present invention.

Fig. 3 is a partially enlarged view (opened state) of a spool of a pilot control valve according to the present invention.

Fig. 4 is an enlarged view I of fig. 2 of a pilot control valve according to the present invention.

Fig. 5 is a schematic structural view of the valve body of the present invention.

Fig. 6 is a partial schematic view of a valve body assembly of the present invention.

Fig. 7 is a schematic structural view of a control valve assembly according to the present invention.

Fig. 8 to 10 are schematic views illustrating an assembly process of a pilot control valve according to the present invention.

Wherein:

the valve comprises a valve body assembly 1, a coil assembly 2, a control valve assembly 3 and a locking nut 4;

the valve comprises a valve body 1.1, a movable iron core 1.2, an adjusting spring 1.3, a connecting nut 1.4 and an adjusting bolt 1.5;

valve barrel 3.1, valve core 3.2, thimble 3.3, guide spring 3.4.

A conical sealing surface 3.1.1 of the valve sleeve and a convex ring 3.1.2;

a conical sealing surface 3.2.1 of the valve core and a sealing belt 3.2.2.

Detailed Description

Referring to fig. 1 to 4, the pilot control valve according to the present invention includes a valve body assembly 1, a coil assembly 2 is sleeved outside the valve body assembly 1, a step hole is radially disposed in a valve body 1.1 of the valve body assembly 1, an adjusting spring 1.3 is located in a small-bore end of the step hole, and a movable iron core 1.2 is located in a large-bore end of the step hole;

a valve sleeve 3.1 of the control valve component 3 is connected with a valve body 1.1, a valve core 3.2 is movably arranged in the valve sleeve 3.1, a pilot hole is arranged at the center of the valve core 3.2 along the radial direction of the valve core, a thimble 3.3 is arranged in the pilot hole in a sliding manner, a pilot spring 3.4 is sleeved at one end of the thimble 3.3 extending out of the valve core 3.2, and the thimble 3.3 is abutted against a movable iron core 1.2; the end part of the valve core 3.2 is reduced in diameter through a valve core conical sealing surface 3.2.1 and then inserted into an oil outlet of the valve sleeve 3.1, an oil outlet channel with an annular structure is formed between the end part of the valve core 3.2 and the inner wall of an oil outlet of the valve sleeve 3.1, and the end part of the oil outlet of the valve sleeve 3.1 is provided with a valve sleeve conical sealing surface 3.1.1 which is matched with the valve core conical sealing surface 3.2.1 in a fit manner, so that the sealing surface is increased through surface contact;

furthermore, a convex ring 3.1.2 is convexly arranged on the upper part or the lower part of the valve sleeve conical sealing surface 3.1.1, and a sealing belt 3.2.2 with an annular structure is arranged on the upper part of the valve core conical sealing surface 3.2.1; by the design of the convex ring 3.1.2 (the convex size is small), the sealing reliability is ensured, the defect of processing precision or assembly error can be made up, meanwhile, the sealing performance is tighter and the hydraulic power is smoother when hydraulic oil is introduced under the action of the pilot valve through the design of the sealing belt 3.2.2, so that the overall control curve is smoother;

furthermore, a through hole communicated with the pilot hole is arranged on the outer wall of the valve core 3.2 along the radial direction of the valve core, a partition plate is arranged in the pilot hole to divide the pilot hole into a left pilot hole and a right pilot hole, the through hole is communicated with the left pilot hole, the right pilot hole is communicated with the oil outlet at the right end of the valve sleeve 3.1, a through hole communicated with the left pilot hole and the right pilot hole is arranged on the partition plate, and the head conical section of the thimble 3.3 is inserted in the through hole; an annular oil cavity is formed between the end part of the valve core 3.2 and the inner wall of the valve sleeve 3.1, the through hole is communicated with the annular oil cavity, and an oil inlet on the valve sleeve 3.1 is communicated with the annular oil cavity;

further, the valve body 1.1 is connected with the valve sleeve 3.1 through a connecting nut 1.4;

furthermore, the diameter of one end of the thimble 3.3 extending out of the valve core 3.2 is increased to form a large-diameter end, the pilot spring 3.4 is sleeved on the small-diameter end, one end of the pilot spring 3.4 abuts against the step surface, and the other end abuts against the valve core 3.2;

referring to fig. 5 to 10, a pilot control valve and an assembling process thereof, the process steps are:

step 1, processing parts, wherein the processing steps of the valve body 1.1 are as follows: milling a magnetism isolating groove with an annular structure on the outer surface of the cylindrical workpiece, and welding an aluminum bronze welding wire in the magnetism isolating groove by a digital intelligent pulse welding machine to form a magnetism isolating ring, wherein the welding surface of the magnetism isolating ring is golden uniform fish scale pattern;

step 2, the movable iron core 1.2 is wrapped with lining cloth (the lining cloth is made of Teflon glass fiber) and then is inserted into the valve body 1.1 in a sliding mode, and then the connecting nut 1.4 is screwed on the valve body 1.1;

step 3, assembling the control valve assembly 3: after the valve sleeve 3.1 is vertically placed, the valve core 3.2 vertically slides into the valve sleeve 3.1, and the thimble 3.3 sleeved with the pilot spring 3.4 vertically slides into the valve core 3.2;

step 4, the connecting nut 1.4 of the semi-finished valve body assembly 1 prepared in the step 2 is screwed on the valve sleeve 3.1 of the control valve assembly 3;

step 5, after the adjusting spring 1.3 is inserted into the valve body 1.1 and contacts the movable iron core 1.2, the adjusting bolt 1.5 is screwed on the valve body 1.1 to plug the adjusting spring 1.3;

step 6, after the coil assembly 2 is sleeved outside the valve body 1.1, the locking nut 4 is screwed on the valve body 1.1 to complete assembly;

and 7, detecting and carrying out performance test.

In addition: it should be noted that the above-mentioned embodiment is only a preferred embodiment of the present patent, and any modification or improvement made by those skilled in the art based on the above-mentioned conception is within the protection scope of the present patent.