Many construction machinery working condition requires its working motor to alternate between the following two states: one is to require the motor to output large torque and keep the low speed; the other is to require the motor to output a small torque and maintain a high speed. At this point due to the pressure and flow of hydraulic oil is not easy to change, can not meet the requirements of the working conditions. In order to achieve the design purpose, we can only use the following two methods: one is the choice of variable motor, the other is to use two quantitative motor parallel and series switching method. The following describes a can achieve parallel motor switch series, in order to achieve high and low speed hydraulic control valve. The hydraulic control two-speed valve has the advantages of compact structure and convenient operation, and can greatly simplify the oil connection, and can reliably and conveniently switch the high and low speeds of the motor even when the hydraulic oil flow and the hydraulic pressure are constant. The valve structure principle and working process shown in Figure 1. The liquid-controlled two-speed valve body 6 is irregular cuboid, the middle has a cavity, the valve body 6 has six open ports communicating with the cavity, the two star seals 18 are mounted on the valve body 6 empty In the two grooves in the cavity, the valve body 6 and the valve core 8 are sealed to prevent leakage of hydraulic oil. Both ends of the valve body 6 are respectively provided with an upper cover 13 and a lower cover 1. Each short cover is respectively fixed on the valve body 6 by four screws 11 and a spring washer 10. The cover is used for holding the oil in the casing and the upper cover Port â…¢ (12) for the control port. O-ring 9 is placed in the groove of the upper cover 13. The slide valve core 8 is arranged in the cavity which is matched with the valve body 6, the valve core 8 is cylindrical, there are three oil channels and a retaining ring mounting groove on the valve core, one retaining ring 19, the washer 4 and the spring 3 One end of the spring ring is pressed against the washer 4 at one end, and the other end is pressed against the inner wall of the lower end cover 1. When there is no hydraulic oil in the cavity of the upper end cover 13, the spring 3 will press the retaining ring 19 against the valve body 6. At this moment, the six oil ports on the valve body 6 pass through the three oil passages on the valve spool The first group is the port â…¥ (16), the port â…¥ (17), the second group is the port I (5), the port â…£ (14), the third group is the port â…¡ (7) ), The oil port â…¤ (15), to achieve a series of motor â… (20) and motor â…¡ (21); when the pressure oil from the port â…¢ (12) into the cavity of the upper cover 13, the spool 8 at a pressure of 2 × 106 ~ 3 × 106Pa under the action of the hydraulic oil to slide to the side of the spring 3 until the other end surface of the spool 8 in the gland 2, the spool 8 to stop moving at this time, the valve body 6 6 A port through the spool on the three oil channels to form two groups of mouth, a group of port â… (15), port â…¥ (16), port â…¦ (17), and the other race port â…¡ (7 ), Port â…£ (14), port â…¤ (15), to achieve motor â… (20) and motor â…¡ (21) in parallel. The valve has been successfully applied in horizontal directional drilling machine developed by Xugong Research Institute, and also provided a new way for other hydraulic series to solve such working conditions and has good application prospect.
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