CN104565416B - Slide valve spool connector - Google Patents

Abstract

The invention discloses a slide valve spool connector. The slide valve spool connector comprises a driving device (1), a valve spool (2), a first steel ball (3a), a second steel ball (3b), a spring support seat (4), a spring (5) and a support (6). One end of the spring support seat (4) is connected with the support (6) through the spring (5), one end of the valve spool (2) and one end of the spring support seat (4) are provided with a conical hole respectively and abutted against two ends of the second steel ball (3b), and one end of the driving device (1) and the other collinear end on the same straight line are provided with a conical hole respectively and abutted against the two ends of the first steel ball (3a).. By adopting the slide valve spool connector to hydraulically measure, the valve spool is kept unaffected by additional radial force, and measuring accuracy is improved.

Description

Spool valve connecting device

technical field

The invention belongs to the field of hydraulic control, in particular to a connecting device for a spool of a slide valve.

Background technique

The servo valve is the core precision control element of the servo system, and the spool valve is the power amplification stage of the traditional servo valve, and its performance determines the performance of the servo valve.

When the oil flows through the spool valve cavity, its flow velocity and direction change, which produces a reaction force on the valve core, that is, hydraulic force. The hydraulic power is divided into two types, one is the steady-state hydraulic power generated under steady flow which is proportional to the opening of the slide valve; Proportional to transient hydraulic forces. The existence of steady-state hydrodynamic force and transient hydrodynamic force will not only affect the normal movement of the slide valve, but also cause problems such as nonlinearity and stability, so further research should be carried out.

Traditionally, the hydraulic power is roughly calculated with empirical formulas, and since the gap between the spool valve core and the valve sleeve is generally between 0.003mm and 0.006mm, if the structural design of the valve core connection device is unreasonable, the external force will drive the valve core to move axially. It is very easy to make the valve core contact with the valve sleeve to generate radial additional force, which causes a large deviation in the measurement results. Therefore, for the measurement of the hydraulic power of the spool valve, the most important link is to design a reasonable spool connection device.

Contents of the invention

The technical problem to be solved by the present invention is to ensure that the spool of the slide valve will not be affected by radial additional force during the process of measuring the hydraulic power of the slide valve, so as to achieve the purpose of accurately measuring the hydraulic power of the slide valve.

In order to solve the above problems, the present invention discloses a spool connecting device of a slide valve, comprising:

Driving device, spool, first steel ball, second steel ball, spring support seat, spring, support, one end of spring is assembled on the spring support seat, the other end of spring is assembled on the support, one end of spool is connected with One end of the spring support seat has taper holes with the same taper angle, which are respectively supported on the two ends of the second steel ball. One end of the driving device and the other end of the same line on the same line as the valve core have taper holes with the same taper angle. , respectively supporting the two ends of the first steel ball.

Preferably, the aforementioned drive device further includes a force sensor, a laser displacement sensor and a height adjuster.

Preferably, the aforementioned spring is always in a compressed state.

Preferably, the taper angle of the aforementioned taper hole is 120° or 60°.

Preferably, the assembly gap between the aforementioned spring support seat and the spring is less than 0.1 mm.

The beneficial effects of the present invention are:

The driving device and the valve core with taper holes, the spring support seat and the valve core respectively clamp the first steel ball and the second steel ball. During the measurement process, the first steel ball and the second steel ball do not produce deformation, so eliminating It eliminates the influence of the drive device and the spool, the spring support seat and the spool being out of axis, realizes that the spool does not contact the valve sleeve during the sliding process, and is not affected by the radial additional force, making the measurement result more accurate.

During the entire measurement process, the spring is always in a compressed state, which provides a pre-tightening effect for the entire coupling device and ensures the uniform movement of the spool during measurement.

The taper angle of the taper hole is 120° or 60°, which ensures sufficient contact between the driving device, the valve core and the spring support seat and the first steel ball and the second steel ball.

The assembly gap between the spring support seat and the spring is less than 0.1mm, which ensures the reliability of assembly.

Description of drawings

Fig. 1 is a plan view of the connecting device of the slide valve spool;

Fig. 2 is a cross-sectional view of the spool connecting device of the spool valve;

Fig. 3 is a partial sectional view of a tapered hole in the first embodiment of the present invention;

Fig. 4 is a partial sectional view of the taper hole in the second embodiment of the present invention.

In Fig. 1 and Fig. 2, 1-driving device, 2-spool, 3a-first steel ball, 3b-second steel ball, 4-spring support seat, 5-spring, 6-support.

detailed description

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

Example 1

This embodiment is a connecting device for a spool valve core, the structure of which is shown in Figures 1, 2, and 3, including: a driving device 1, a valve core 2, a first steel ball 3a, a second steel ball 3b, and a spring support seat 4 , spring 5, bearing 6. One end of the spring support seat 4 is connected with the support seat 6 through a spring 5, and one end of the valve core 2 and one end of the spring support seat 4 are each provided with a taper hole with a 120° cone angle, which respectively stand on the two ends of the second steel ball 3b. One end of the driving device 1 and the other end of the same line on the same straight line as the spool 2 are respectively provided with taper holes with a taper angle of 120°, which respectively abut against the two ends of the first steel ball 3a. The drive device 1 also includes a force sensor, a laser displacement sensor and a height adjuster. The spring 5 is always in a compressed state, and the assembly gap between the spring support seat 4 and the spring 5 is less than 0.1 mm.

Example 2

Another embodiment of the present invention differs from the first embodiment in that the taper angle of the tapered hole is 60°, as shown in FIG. 4 .

The process of measuring hydraulic power in the present invention is:

Before the measurement, install the support 6 of the spool valve core connection device on the high-precision three-dimensional coordinate positioning platform, and adjust the high-precision height adjuster in the drive device 1 according to the installation height, so that the entire spool valve core connection device is at the same position. Axis status. The valve core 2 is covered with a valve sleeve, and the valve core 2 is not in contact with the valve sleeve. Use special equipment to supply oil to spool 2.

During measurement, the driving device 1 moves to the right along the horizontal direction, driving the first steel ball 3a, the second steel ball 3b, the valve core 2, the spring support seat 4 and the spring 5 to move to the right together. Because the driving device 1 and the spring support seat 4 lock the valve core through the first steel ball 3a and the second steel ball 3b, the first steel ball 3a and the second steel ball 3b do not produce deformation, so the driving device 1 and the valve core 2, The spring support seat 4 and the valve core 2 are always in a coaxial state, so that the valve core 2 is not affected by radial additional force. At the same time, the spring 5 is always in a compressed state, which ensures the uniform movement of the spool 2 during measurement. During the measurement process, the force sensor in the driving device 1 records the data of the horizontal reaction force received by the driving device 1 from the first steel ball 3 a and the second steel ball 3 b, and the laser displacement sensor records the data of the displacement of the valve core 2 . The above data is sent to the computer, and the hydrodynamic dynamic curve is obtained through a specific program, so as to obtain the value of the hydrodynamic force.

The present invention has been described above in conjunction with the accompanying drawings and embodiments, and it is obvious that the specific implementation of the present invention is not limited by the above methods. As long as the idea and technical solution of the present invention are used for non-substantial improvement, or without improvement, the idea and technical solution of the present invention are directly applied to other occasions, all within the protection scope of the present invention.

Claims (5)

1. A slide valve spool coupling device, comprising a driving device (1), a spool (2), a first steel ball (3a), a second steel ball (3b), a spring support seat (4), a spring (5 ), the support (6), one end of the spring (5) is assembled on the spring support seat (4), and the other end of the spring (5) is assembled on the support (6), it is characterized in that: the valve core (2) One end and one end of the spring support seat (4) respectively have taper holes with the same taper angle, respectively supporting the two ends of the second steel ball (3b), and one end of the driving device (1) is on the same line as the spool (2) Tapered holes with the same taper angle are respectively opened at the other ends of the collinear line, and respectively propped against the two ends of the first steel ball (3a). 2. The coupling device for the spool valve core according to claim 1, characterized in that: the driving device (1) further comprises a force sensor, a laser displacement sensor and a height adjuster. 3. The coupling device for the spool valve core according to claim 1 or 2, characterized in that the spring (5) is in a compressed state. 4. The coupling device for the slide valve core according to claim 1 or 2, characterized in that: the cone angle of the tapered hole is 120° or 60°. 5. The coupling device for the spool valve core according to claim 1 or 2, characterized in that: the assembly gap between the spring support seat (4) and the spring (5) is less than 0.1mm.