There are many types of mechanical velvet stripping machines. According to the different stiffness of the main working parts of the machine, they can be divided into rigid working parts (such as sawtooth stripping machines and abrasive stripping machines) and elastic working parts (such as wire brush roller stripping machines). Velvet machine) two categories. Among them, the sawtooth stripping machine with rigid workpiece parts has higher production efficiency and better adaptability. It is the main stripping machine used in my country.
There are many types of sawtooth velvet stripping machines. According to the brush type, there are brush type and air flow type; according to the number of saw blades, there are 200 type, 176 type, 160 type, 144 type, 141 type and other types; The number of layers is divided into single layer type, double layer type and three layer type. Currently, the most commonly used are MR-141 and MR-144D sawtooth stripping machines. In addition, 6MRQ-141A, 6MR160D-10 and MR200-10 are also commonly used.
1. The structure and function of the MR-144D sawtooth stripping machine
The MR-144D brush sawtooth stripping machine is shown in Figure 9-5. The cotton seeds transported by the auger enter the hopper to prepare the material source for stripping down. Driven by the automatic control motor, the feeding roller passes through the reduction box and is transmitted to the feeding roller at a low speed. The feeding rollers rotate oppositely in the feeding hopper, leaking the cotton seeds and falling on the drain plate, passing through the drain plate. Entering the working box, the clean cotton enters the working box and forms a cotton roll through the stirring of the plectrum roller and the hooking action of the saw blade. There is a linear speed difference between the cotton roll and the saw blade, which is conducive to lint stripping. Under the hooking action of the saw teeth, the cotton is brought to the velvet stripping work point to separate the cotton and lint. The separated lint enters the brushing part with the saw blade. The separated cotton has reduced adhesion and slides along the strips and is discharged out of the machine. The short lint entering the brushing part is brushed off the saw teeth under the action of the brush (or air flow). Since the centrifugal force of the impurities in the lint is much greater than that of the lint, the impurities are separated from the lint under the action of the impurity removal knife. The impurities are discharged out of the machine through the impurity discharge auger, and the short lint enters the velvet collection box under the action of negative pressure and is ready for packaging.
The machine has an automatic control process during the entire stripping process. It controls the feeding amount through the continuously variable speed system of the feeding motor, so that the density of the cotton roll can be adjusted and maintained stable. After the cotton seeds are decelerated by the reduction box, they are transferred to the feeding roller. A current transformer is installed in the circuit of the main motor of stripping. The current transformer sends an electrical signal to the DC motor for feedback. When too much cotton is fed, the torque of the saw shaft becomes larger and the current of the saw shaft motor becomes larger. Through the action of the mutual inductor in the saw shaft motor circuit, the feeding current is reduced, the DC motor speed is reduced, and the feeding amount is reduced. On the contrary, there is insufficient cotton in the working box, and the feeding amount is increased through the above device to make the feeding amount equal to The amount of rows remains relatively stable. If you want to change the original feeding amount, you can rotate the potentiometer to change the given current so that the cotton roll reaches the required density.
(1) Feeding part
The feeding part mainly includes a feeding bucket, a feeding roller, a feeding adjustment device and a feeding plate. Its function is to automatically and evenly feed cotton into the working box according to the production needs of the stripping machine. , and before the cotton enters the work box, remove the iron debris mixed in it to protect the saw blade from damage.
(2) Velvet stripping part
The velvet stripping part consists of two end wall panels, hugging boards, pick rollers, chest boards, rib rows, saw blade rollers, cotton combs and other mechanical parts. Its function is to scrape off the lint on the cotton in the work box through mechanical action.
1. Wall panels at both ends
There is a relatively symmetrical wall panel at each end of the working box of the stripping machine. It is made of cast iron. Its function is to limit the axial movement of the cotton roll. Second, it is used to support parts such as density boards, holding boards, and plectrum rollers.
The wall panels at both ends, the breast board and the rib rows are installed as a whole. It is required that the planes of the two wall panels must be parallel to each other; the planes of the two wall panels must be perpendicular to the axis of the breast board, rib row and plectrum roller.
The parts where the wall panels at both ends are in contact with the cotton rolls should be smooth and smooth, and no defects such as burrs, cracks, scars, etc. are allowed.
2. Holding plate
Holding plate is the control cover when the cotton roll is moving. The holding plate is composed of a holding plate body, an eccentric adjuster, an unloading handle and other components.
The body of the hugging plate is arc-shaped and made of steel plates with a thickness of 2.5~3.0mm. The upper part is hung in the notches of the wall panels at both ends of the work box, and the lower part is hung with eccentric hooks at both ends of the eccentric adjuster. On the hook stud screws of the wall panels on both sides. The eccentric adjuster is divided into a left eccentric adjuster and a right eccentric adjuster, made of cast iron. Its function is to support the lower part of the holding plate together with the eccentric shaft, cooperate with the hook column screws on the wall plate and the eccentric shaft on the holding plate, and adjust the position of the holding plate on the work box and the space between the cotton comb and the rib row surface. gap, thereby achieving the purpose of adjusting the volume of the working box and the falling speed of the cotton, thereby adjusting the density of the cotton roll and the discharge of cotton.
3. Cotton comb
Cotton comb is made of cast iron and is one of the main adjusting mechanisms of the work box. The cotton comb is installed on the lower side of the holding plate and can be adjusted forward and backward relative to the holding plate. Turn the left and right adjustment handwheels on the outer surface of the holding plate to adjust the cotton comb forward and backward to adjust the distance from the cotton comb to the rib row and change the cotton discharge amount. In the separate stripping process, the distances are: 50-75mm for the first pass, 35-45mm for the second pass, and 16-25mm for the third pass.
According to the requirements for stripping down, there are two sets of cotton combs. One set of comb teeth is 20mm long, which is used when stripping the first down, and the other set is 32mm long, which is used when stripping the second and third down.
4. Pick roller
The pick roller is a 6-blade roller with a diameter of 150mm. During the working process, due to the expansion of the volume of the working box, the quality and density of the cotton roll increase, and the diameter and speed of the pick roller also increase and improve accordingly.mage/20230201/qj2jmgjsyhk.png”>
(6) Rear windshield: As shown in Figure 9-6, the rear windshield is located behind the brush roller and is in contact with the pile support board. The upper and lower parts form a passage for the short pile leading to the pile collection tube. Its function is to cut the high-speed airflow layer on the surface of the brush drum, block the airflow from rotating around the brush drum, and allow the short pile and the airflow to blow to the short pile channel without being brushed. The roller is brought back to the upper space. Because the rear windshield blocks the air flow, a negative pressure is formed in the upper space of the brush roller. There is supplementary air between the front windshield and the saw blade roller to blow the short lint on the saw teeth. .
You can use the adjusting nuts on both sides of the back wall of the brush box to adjust the distance between the rear windshield and the brush. The suitable gap is 1~2mm.
2. Brush cover and impurity removal adjustment Plate, pile support plate and pile outlet
The brush cover is an arc plate concentric with the brush roller. At the front end of the brush cover, an upper row of knives and a baffle plate are installed to facilitate impact or blocking. The impurities discharged from the upper impurity discharge area are dropped.
The impurity discharge adjustment plate and the pile support plate are also arc plates concentric with the brush roller. The impurity discharge adjustment plate can move forward, backward, and up and down to adjust the amount of impurity discharge.
> The size of the velvet outlet of the 144-type brush sawtooth stripping machine is 1744mm×80mm; the size of the velvet outlet of the airflow sawtooth stripping machine is 1003mm×78mm.
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