CN101871475B - Mechanical servo control valve - Google Patents

Abstract

The invention relates to a mechanical servo control valve, which comprises a valve body, an oil inlet and an oil outlet are arranged on the valve body, an oil circuit and a valve core are arranged in the valve body, a valve sleeve is arranged outside the valve core, and a valve sleeve is arranged on the valve core. The operating rod is fixed at the upper end; the feature is: a feedback rod is installed on the valve sleeve along the radial direction of the valve core; a first through hole is arranged on the valve sleeve along the radial direction, and a second through hole is arranged in the middle of the valve core respectively. Two through holes and grooves are provided with a groove at the bottom of the valve core; a spring seat is arranged in the groove of the valve core, and a spring is installed in the spring seat; the first through hole and the second through hole and the oil in the valve body Road Unicom. An adjustment seat is provided between the valve core and the valve body. A limit block is arranged between the adjustment seat and the operating rod. An adjustment screw is provided on the feedback lever. A sealing nut is arranged between the adjusting screw and the valve body. An O-shaped sealing ring is used for sealing between the adjustment seat and the valve body. The invention simplifies the control structure, is convenient to install, has small volume, light weight and simple structure of the valve.

Description

Mechanical Servo Control Valve

technical field

The invention relates to a mechanical servo control valve, which belongs to the field of hydraulic control.

Background technique

With the development of hydraulic technology, new requirements are put forward for the variable control mechanism of the plunger pump. Hydraulic control is generally sub-pump control system and valve control system. Because the pump control system has the characteristics of simple system structure, high integration, small pressure loss and high efficiency, it is widely used in closed loops. The mechanical control valve in this control system It is an indispensable core component, and its control accuracy, sensitivity, mechanism, etc. are very important. Therefore, the performance of the mechanical control valve directly affects the performance of the variable displacement pump and the closed circuit. The current mechanical control valve often has low control accuracy, insensitive response, large leakage, low efficiency, short life, inconvenient installation, and affects system performance. question.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art and provide a mechanical servo control valve with stable performance and high reliability.

According to the technical solution provided by the present invention, the mechanical servo control valve includes a valve body, an oil inlet and an oil outlet are arranged on the valve body, an oil circuit and a valve core are arranged in the valve body, and a valve is arranged outside the valve core. A sleeve is used to fix the operating rod on the upper end of the spool; the feature is: a feedback rod is installed on the valve sleeve along the radial direction of the spool; a spring seat is arranged in the groove of the spool, and a spring is installed in the spring seat.

An adjustment seat is provided between the valve core and the valve body. A limit block is arranged between the adjustment seat and the operating rod. An adjustment screw is provided on the feedback lever. A sealing nut is arranged between the adjusting screw and the valve body. An O-shaped sealing ring is used for sealing between the adjustment seat and the valve body. The spring is fixed in the spring seat by a screw plug.

A first through hole is arranged radially on the valve sleeve, a second through hole and a groove are respectively arranged in the middle of the valve core, and a groove is arranged at the lower part of the valve core; the first through hole and the second through hole The hole communicates with the oil circuit in the valve body. The groove on the valve core is in clearance fit with the end of the feedback rod.

The invention simplifies the control structure, separates the servo control valve from the control mechanism, has the advantages of convenient installation, small size, light weight and simple structure of the valve.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

FIG. 2 is a top view of FIG. 1 .

Detailed ways

The present invention will be further described below in conjunction with specific drawings and embodiments.

As shown in Figures 1 to 2: the mechanical servo control valve includes a valve core 1, a valve sleeve 2, a valve body 3, an adjustment seat 4, an O-ring 5, a feedback rod 6, a sealing nut 7, an operating rod 8, a limit Block 9, adjusting screw 10, oil inlet 11, oil outlet 12, second through hole 13, groove 14, groove 15, spring seat 16, spring 17, screw plug 18, first through hole 19, etc.

The present invention includes a valve body 3, a valve core 1 is arranged in the valve body 3, a valve sleeve 2 is arranged outside the valve core 1, an operating rod 8 is fixed on the upper end of the valve core 1, and a The adjustment seat 4 is provided with a limit block 9 between the adjustment seat 4 and the operating rod 8; a second through hole 13 and a groove 14 are respectively provided in the middle of the valve core 1, and a groove 15 is provided at the bottom of the valve core 1; A spring seat 16 is provided in the groove 14 of the core 1, and a spring 17 is installed in the spring seat 16, and the spring 17 is fixed in the spring seat 16 by a screw plug 18; To install the feedback rod 6, an adjustment screw 10 is provided on the feedback rod 6; a sealing nut 7 is arranged between the adjustment screw 10 and the valve body 3; the groove 15 on the valve core 1 is connected with the end of the feedback rod 6 Clearance fit; between the adjustment seat 4 and the valve body 3 is sealed by an O-ring 5; the valve body 3 is provided with an oil inlet 11 and an oil outlet 12, and an oil circuit is provided in the valve body 3; A first through hole 19 is arranged radially on the sleeve 2 , and the first through hole 19 communicates with the second through hole 13 and the oil passage in the valve body 3 .

The working process of the present invention: when the operating rod 8 is rotated, the valve core 1 can be driven to rotate the valve core 1, so that the second through hole 13 on the valve core 1 is connected with the first through hole 19 on the valve sleeve 2 to connect oil The hydraulic oil enters the variable cylinder from the oil outlet 12, thereby pushing the angle and orientation of the swash plate to change, changing the displacement of the pump and the direction of the oil. At the same time, the variable cylinder drives the feedback rod 6 to push the valve through the principle of leverage. The sleeve 2 rotates so that the through hole on the valve sleeve 2 and the oil circuit turn into an angle to close the oil circuit. In addition, when the valve core 1 rotates, an angle is formed between the groove 14 of the valve core 1 and the spring seat 16, and the spring 17 in the spring seat 16 can drive the valve core 1 to return.

The invention simplifies the control structure, separates the servo control valve from the control mechanism, has the advantages of convenient installation, small size, light weight and simple structure of the valve. The area of the control seat is increased, and the sealing performance is better to prevent oil leakage during long-term work. The use of new materials and advanced heat treatment methods has improved the wear resistance of the valve core and valve sleeve, and the efficiency has been greatly improved. The O-ring is made of fluorine rubber, which is resistant to high and low temperature and is not easy to age, which ensures the reliability of the valve.

Claims (6)

1. a mechanical servo control valve comprises valve body (3), on valve body (3), is provided with filler opening (11) and oil outlet (12), in valve body (3), is provided with oil circuit and spool (1), and sheathed valve pocket (2) outside spool (1) is at the upper end fixing operation bar (8) of spool (1); It is characterized in that: at the radially installation feedback rod (6) of said valve pocket (2) upper edge spool (1); In the groove (14) of spool (1), be provided with spring seat (16), spring (17) is installed in spring seat (16);

Said spring (17) utilizes plug screw (18) to be fixed in the spring seat (16);

On said valve pocket (2), be disposed radially first through hole (19), be respectively equipped with second through hole (13) and groove (14), be provided with groove (15) in spool (1) bottom at said spool (1) middle part; Said first through hole (19) and second through hole (13) and the interior oil circuit UNICOM of valve body (3);

Groove (15) on the said spool (1) cooperates with the tip-clearance of feedback rod (6).

2. mechanical servo control valve as claimed in claim 1 is characterized in that: between said spool (1) and valve body (3), be provided with adjustment seat (4).

3. mechanical servo control valve as claimed in claim 2 is characterized in that: between said adjustment seat (4) and operating stem (8), be provided with limiting stopper (9).

4. mechanical servo control valve as claimed in claim 1 is characterized in that: on said feedback rod (6), be provided with adjustment screw (10).

5. mechanical servo control valve as claimed in claim 4 is characterized in that: between said adjustment screw (10) and the valve body (3) sealing nut (7) is set.

6. mechanical servo control valve as claimed in claim 2 is characterized in that: between said adjustment seat (4) and valve body (3), utilize O-ring seals (5) sealing.

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