6350 tractor hydraulic suspension system oil circuit improvement Guizhou Provincial Electrical and Mechanical School Nie Jianfei 3 50 tractor hydraulic suspension system consists of hydraulic oil pump control valve hydraulic cylinder system safety valve and oil filter. Before the improvement of the hydraulic suspension system, the oil circuit is improved, and the system oil circuit is 2. The difference between 1 and 2 is that a hydraulic lock for controlling the flow of hydraulic oil by a hand wheel is connected in series between the hydraulic oil pump and the hydraulic cylinder, and A cylinder safety valve for protecting the hydraulic cylinder is connected in parallel between the hydraulic lock and the hydraulic cylinder to solve the long-term weak settlement of the agricultural machinery, the early damage of the system safety valve and the strict wear of the control valve, and the hydraulic suspension is improved. System reliability and service life. The static settlement performance of agricultural machinery has been improved by one. Whether the static settlement performance of agricultural machinery meets the specified technical requirements depends mainly on the internal leakage of the high pressure oil section of the hydraulic suspension system. The oil pressure of the high pressure oil section is ensured by the seal ring at both ends of the high pressure oil pipe and the two sealing rings on the control valve of the hydraulic oil pump piston valve system safety valve hydraulic oil pump. If oil leaks from any of the above-mentioned chestnut cylinders and valves, the oil pressure will drop. In 2, after the hydraulic lock is closed, the oil leakage link affecting the static settlement of the agricultural machinery is minimized, which is only related to the sealing performance of the piston seal cylinder safety valve and the hydraulic lock of the hydraulic cylinder, but with the hydraulic oil pump. The technical status of the seal control valve and system safety valve at both ends of the high pressure oil pipe of the oil valve. Irrelevant, the static settlement performance of agricultural machinery is effectively improved. The service life of the hydraulic components and the control valve are improved, and the hydraulic cylinder and the suspension mechanism are also protected. The opening pressure is determined according to the maximum working pressure of the hydraulic oil pump of 17.5 MPa, the opening pressure is low, and the tractor is equipped with agricultural machinery. Especially for heavy agricultural machinery, the pulse pressure generated in the hydraulic cylinder often exceeds the opening pressure of the system safety valve, forcing it to open frequently, causing wear and damage. 1 tank 2 oil filter 3 control valve 4 inlet valve 5 plunger Pump 6 oil outlet valve 7 cylinder 8 system safety valve 9 hydraulic lock 10 cylinder safety valve Guizhou agricultural machinery When the hydraulic brake system of the automobile deformation transport vehicle or transport tractor has a brake failure, etc., the foot sense can be used for rapid diagnosis. Find the cause of the fault and the fault location to avoid blind disassembly. Use the toe to gently step on the brake pedal. If the pedal is stepped to 23 o'clock, the brake resistance will indicate that the pedal free travel is too large. If the brake pedal can be stepped on without resistance, and the pedal feels no resistance even when stepping on a few feet, the pedal position does not rise, indicating that the cause of the fault is the lack of brake fluid in the master cylinder, or the reservoir The cover vent is blocked, or the brake cup is ruptured and stepped over. Brake fluid should be added to the reservoir to clear the vent and replace the brake cup. If the brake pedal can be pressed to the bottom, but the pedal position is increased after even a few steps, and the pedal is stepped on again at the interval time, the pedal can be stepped on to the bottom. This indicates that the pressure in the brake pipe is too low. The reason is that the brake cup is deteriorated, the oil return valve is not tightly sealed, and the brake master cylinder or the cylinder piston and the cylinder wall are worn to make the clearance too large. Move the piston to the bowl and clean the return valve. If the brake pedal is pressed quickly and the free stroke is small, the brake is effective, and when the brake pedal is slowly depressed, the free stroke is large and the brake is invalid, indicating that the brake master cylinder is worn. If you feel that the pedal continues to move down, there is a leak in the brake line. First check whether the brake pipe is broken or not, and check whether the pipe joint is loose. Check whether there is any brake fluid leakage at the dust pump sleeve of the master pump push rod and the wheel brake wing. If there is, the master pump or the pump bowl The aging is broken or stepped over and should be replaced. If you feel the softness of the brake pedal when you step on the brake pedal, it feels that the pedal is hard or does not move, indicating that the brake pipe is sedimented, or the brake master cylinder and the split chestnut bowl are deformed to be stuck. The brake cup should be replaced and the brake line should be washed. After stepping on the brake pedal, release it. If the pedal can't return to the original position, it means that the brake master cylinder return valve or the oil return hole is blocked; if the master pump is accompanied by a squeaking sound, the master pump cup is Step over and reassemble or replace. The hydraulic brake system with quick self-locking joints, if the brake is effective when the brake pedal is slowly depressed, and the brake is invalid when the brake pedal is pressed quickly, it means that the quick self-locking joint is equipped with two springs at the joint or the joint. Improper adjustment of the spring force, so when the brake pedal is pressed quickly, the joint produces a 0 lock phenomenon, and the brake fluid cannot pass. The joint should be reassembled and the spring force of the oil end joint should be properly lowered. White cold is bad. In addition, since the hydraulic cylinder and the control valve are connected in series, the oil outlet of the control valve is always in communication with the oil return passage of the hydraulic cylinder, and the hydraulic cylinder generates a high impact pressure, which directly acts on the oil outlet of the control valve. , causing serious wear at the oil outlet. In 2, because the system safety valve opening pressure is still 17.5, it is only used to protect hydraulic components such as hydraulic oil pump and control valve and cylinder safety valve opening pressure 210, double safety valve system for protecting hydraulic cylinder and suspension mechanism. When the hydraulic lock is closed, the hydraulic circuit of the hydraulic cylinder and the system safety valve and the control valve outlet is disconnected by the hydraulic lock, and the pulse pressure generated in the hydraulic cylinder is borne by the cylinder safety valve to protect the system safety valve and the control valve. , increasing their service life. Adjustable control of the landing speed of agricultural machinery Because the SH50 tractor uses an integral control valve, it is difficult to achieve rapid and slow decline of agricultural machinery. From 2, when the agricultural machinery falls, the oil in the hydraulic cylinder is under the action of the weight of the agricultural implement, and the hydraulic lock controlled by the handwheel must first flow to the outlet of the control valve, and then flow to the fuel tank to realize the agricultural implement. Landing. When the hand wheel is turned clockwise, the hydraulic oil flow through the hydraulic lock increases, and the agricultural machine has a fast landing speed, and the landing speed is slow. If the hand wheel rotates counterclockwise and hits the limit pin and exits safely to close the hydraulic lock, the agricultural implement will be locked at a certain height position. At this time, even if the inner handle mounted on the hydraulic lift cover is controlled to control the lifting and lowering of the agricultural implement, the agricultural implement will not be lifted or lowered, and the agricultural implement can be prevented from being suddenly lifted or lowered due to the accidental movement of the joystick, thereby avoiding the occurrence of an accident. . Feeling judgment of hydraulic brake system failure Power Screwdriver,Electric Screwdriver,Ratchet Screwdriver,Cordless Screwdriver Ebic Tools Limited , http://www.ebictools.com