Analysis of the function of cotton box mixer
1. Blending action
There are two mixing methods: one is “laying straight, sandwich mixing”; the other is tumbling mixing.
(1) Direct extraction from cotton shop, sandwich blend
The cotton layer output from the cotton condenser is “layed horizontally” layer by layer through the swing bucket on the cotton feeding curtain, and the braided curtain is “directly extracted” from different cotton layers fiber in. This kind of “straight-laying” allows the cotton pile captured by the braided curtain at the same time to contain raw materials of various components. The degree of mixing depends on the number of layers of cotton piles and the content of each layer of cotton piles. Raw material ingredients.
If the swing bucket swings fast and the cotton cord conveying speed is slow, the cotton pile contains more layers and the mixing effect is good.
The cotton catching car rotates (straight ahead) quickly, and the more different components it grabs per unit time, the more raw material components each layer of the cotton pile contains, and the better the mixing effect.
The inclination angle of the cotton mixing ratio inclined plate: the amount of cotton stored in the cotton box that is too large is reduced, which is not conducive to mixing. The function of the mixed cotton ratio inclined plate is to ensure that the cotton pile composed of multiple components is not destroyed, making it easier for the braid to capture all the components. When the speed of the cotton curtain is accelerated, the inclination angle of the mixed cotton ratio inclined plate should be increased. Generally, the inclination angle of the mixed cotton ratio inclined plate is generally adjusted within the range of 22.5°~40°.
(2) Tumbling mixing
The horizontal curtain transports the cotton pile forward, and the horn curtain grabs the raw cotton and causes the fibers to tumble in the cotton box, thereby achieving the purpose of mixing.
Characteristics of tumbling mixing:
Because the brad nails have different grabbing abilities for loose and tight cotton pieces with large differences in properties, so when starting the car, raw materials that are loose and have strong adhesion are easily grabbed by the brad nails. When the raw materials are tumbling violently, it is easy to produce bundles and cotton balls, and the mixing effect is poor.
2. Garnetting action
The main factors affecting the loosening effect are:
Spike specification
Thickness and density of spikes: The cotton piece to be sorted is large, and the spikes should be thick. , The density should be thin. If the density is dense, the cotton block will easily float on the nail surface and affect the grasp. However, if the density is too thin, the loosening effect will be weakened.
The angle of the brad nail: affects the grabbing efficiency. The inclination angle of the brad nail is small, the force of the brad nail piercing and grabbing the cotton block is large (proportional to the cosine value of the brad nail inclination angle), and the frictional resistance when the brad nail pierces the cotton block (proportional to the sine value of the brad nail inclination angle) Small, easy to pull loose and can reduce the damage of brad nails. However, if the inclination angle of the brad is too small, the volume between the brad and the curtain will be reduced, and the fiber capacity will be reduced. The inclination angle of brad nails is generally 30° to 50°.
The cotton box close to the cotton picking machine, such as the automatic cotton mixing machine, will sort out larger cotton pieces, while the cotton box close to the cleaning machine will sort out smaller cotton pieces. Therefore, the density of the brads should be gradually increased, and the angle of the brads should also be gradually increased. decrease.
(2) Gauge gauge
It is mainly the distance between the cotton leveling roller and the square nail curtain and the distance between the cotton pressing curtain and the square nail curtain. Their spacing is small, the horns pierce the cotton block deeply, and the opening effect is good, and the cotton block that is too large is not easy to pass, which is beneficial to the uniform and stable cotton output, but the spacing is too small, which reduces the output.
Between the braided curtain and the cotton equalizing roller: the automatic cotton mixing machine adopts 40~80mm; the double cotton box cotton feeder adopts 0~40mm.
Between braided curtains and pressed cotton curtains: A006BS and A006CS cotton boxes adopt 60~80mm.
(3) Speed
As the speed of the leveling roller increases, the raw materials brought out by the braided curtain are struck more times by the leveling roller per unit time, and the loosening effect on the cotton block is enhanced;
Braided curtain As the linear speed increases, the amount of cotton carried by the braided curtain per unit time increases, and the output increases. However, the number of blows of the uniform cotton roller per unit length on the braided curtain is reduced, which weakens the loosening effect. However, the loosening effect between the horn curtain and the pressed cotton curtain has been strengthened (due to the increase in relative speed between the two). Therefore, in general, the linear speed of the brad curtain has a greater impact on the output and a smaller impact on the loosening effect.
3. Cleaning action
Occurrence location:
The main part is between the cotton stripper and the dust grid. The second location is:
At the dust grid (leaky bottom) under the horn curtain.
The mesh of the dust cage of the cotton condensing device has sucked out some fine impurities.
The iron-absorbing device in the cotton-discharging part of the lower cotton-discharging mode can also absorb part of the iron impurities.
Cotton box mechanical impurity removal requirements: Large and fragile impurities such as cotton seeds and seed cotton should be completely removed, that is, “early and less broken”; hard iron impurities should be removed as early as possible to avoid damage to the machine parts and fire .
The main factors affecting the impurity removal effect:
The structure of the cotton stripping beater:
The blade cotton stripping beater has a strong impurity removal effect, while the leather wing beater has a strong cotton stripping effect, but has a strong impact on the cotton block. Weak, the stripping beater produces less waste and its impurity removal effect is weak.
The speed of the stripping beater:
Affects the impact force of the cotton block on the dust grid. If the rotation speed is too low, the waste will be reduced and the impurity removal effect will be reduced; if the rotation speed is too high, it will easily cause back flowers and form bundles and neps. Generally, 400~600rpm is adopted.
Dust bar grid bar spacing:
The spacing of the dust bar (which is the channel for impurities to fall) should be larger than the length of the cotton seeds, so that large impurities such as cotton seeds can fully fall. The spacing here is generally configured as 10~13mm.
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