The main function of the spray gun is to spray mortar. It is to spray mortar intermittently through the control of the pump body and air pressure. It is the main working part of the mortar spraying machine. There is a special nozzle at the head of the spray gun, because the mortar sprayed out each time will not all enter the steel shell. Therefore, after spraying a certain amount of steel shell, a large amount of mortar will gather at the head of the spray gun, causing blockage. Therefore, the head needs to be cleaned. In order to realize automatic cleaning, free rotation of the spray gun and positioning of the spray gun, the spray gun is fixed on the rotating cylinder, so the requirements for cylinder selection are higher.
The rotating cylinder is fixed on the machine platform of the spraying machine, and the position is unchanged. Because the cylinder should bear the weight of the spray gun and the air pressure during spraying, the cylinder with large shaft diameter and small stroke should be selected. This cylinder is the main part of the mechanism positioning, and its selection is directly related to the positioning and cleaning effect of the cleaning device.
The main function of a small adjustable speed motor is to drive the cleaning collet at the front end (the collet is made of special materials and driven by the motor to rotate and clean the mortar at the head).
The function of the air cylinder is to drive the small motor so that the motor can move back and forth. The device that moves back and forth is realized by sliding the linear bearing on the guide rod. It can only move back and forth, but not move in other directions. The movement of the motor directly drives the cleaning collet, so as to contact the head of the spray gun more closely and clean the head of the spray gun. The position of the chuck and the connection of the motor are connected through the sleeve and the shaft, so that the position is relatively fixed, and can be adjusted at the same time.
The whole cleaning process is as follows: when the number of steel shells sprayed by the sprayer reaches a certain amount. When there are about 6000-8000, mortar accumulation may occur at the head of the spray gun, which may affect the subsequent spraying and block the nozzle. At this time, the main engine stops, the spray gun turns to the same horizontal position as the small motor by rotating the air cylinder. When the spray gun reaches a designated position, the air cylinder starts to act, and it moves parallel with the small motor in the horizontal direction. The cleaning collet and the spray gun head shall be in close contact, and the small motor shall rotate at the same time. In the process of the small motor driving the collet to rotate, the mortar shall fall off from the spray gun head due to the effect of friction. Clean in a short time. At this time, the cylinder moves backward to let the motor with the cleaning collet move backward, leaving the original position, and the motor stops rotating at the same time. At this time, the rotating cylinder starts to move, driving the gun clamped on it back to its original position, and the main engine starts to move. In this way, the whole cleaning process is completed under electrical control. Because this process can be automated, but also can clean the mortar, also reduce the work intensity of personnel operation, this part of the working principle is simple, high reliability. It is mainly to screen the cleaning chuck so that it can clean the head of the spray gun well and reduce the pollution to the machine. In the whole cleaning process, to achieve the coordination of all mechanisms, it is necessary to use microcomputer control, and also to use with the host machine, so the electrical design requirements will be higher. Because the position of the head of the spray gun is directly related to the spraying quality, the motion reliability of each mechanism is very high. After each cleaning process, the position of the head of the spray gun and the position of each mechanism should be kept at a certain position. The position of each mechanism is detected by sensors, which can ensure the position unchanged to the greatest extent.
Through the design and application of the spray gun cleaning system of the mortar spraying machine, it not only reduces the labor intensity of the operator, improves the working environment, but also improves the production efficiency of the whole equipment, reduces the impact of the disordered shutdown times of the machine on the quality of the battery steel shell, at the same time, the environmental pollution is also reduced, and the automation degree of the whole equipment is higher, and the whole is more beautiful. Based on the application effect of the cleaning device, the expected effect is achieved. In the design process, a large number of tests have been carried out on the materials for cleaning the collet, which is more difficult, and some experience has been accumulated for the problems of other materials in the future.
