The carding machine is known as the “heart” of the spinning process. This process is responsible for the main functions of removing impurities and lint. Whether these functions can be fully exerted will directly determine the amount of impurities in the yarn. It has a direct or indirect impact on quality indicators such as yarn evenness; if the automatic cylinder changing device of carding fails frequently, it will not only affect the normal production, but also increase the workload of operators and maintenance workers. Labor intensity. In order to solve these problems, the first-line communication column in this issue focuses on Lu’an Huayuan Textile Co., Ltd. and Shandong Changyi Haitian Cotton Spinning Group from aspects such as transforming the way the carding machine absorbs waste and changing the process of the licker-in part of the fa2224 carding machine. Co., Ltd.’s production experience in improving the quality of raw strips was introduced.
01 Transform the carding machine’s waste suction method to provide conditions for stable product quality
In a186 In the series of carding machines, the traditional design of the waste collection system is to dig a cotton collection bucket underground behind the card, and suck the waste from the card into the dust removal system through the underground dust removal channel. The design of this dust removal system is very clean on the ground, but the underground construction volume is large and the construction period is long. At the same time, there are problems of energy consumption due to large wind resistance and wind consumption. The biggest drawback of this downdraft type is: due to underground wind The surface of the air duct is relatively rough and prone to stains, and the surface resistance of the air duct is relatively large; because the underground branch air duct is narrow, it is not easy to clean; the surface of the air duct is stained and the dust at the bottom is serious, so it is a lot of work to arrange manual cleaning and is not easy to clean. Completely, it becomes a major safety hazard.
In view of the shortcomings of the downdraft suction system, some companies are currently transforming the downdraft suction system into Ground suction waste collection method (referred to as the upward suction waste collection system). The advantages of using an up-suction removal system are most obvious in installation. First of all, it is very convenient to install. It does not require a lot of construction underground, saves time, has obvious economic benefits, and is easy to adjust and inspect. In the new high-yield and high-speed carding machine been widely adopted.
In order to solve the problem of not having to excavate the ground and realize the upward suction dust removal solution, we designed a cotton collection bucket at the rear belly of the carding machine, which successfully solved the problem. This problem has achieved good results. The cotton collecting hopper can be installed under the licker-in roller of the a186 series carding machine, at the rear belly position. It mainly collects the waste cotton at the bottom of the dust collector and small drain, and smoothly sucks it away through the air duct. After the cotton collecting bucket is installed, the inspection door on the rear belly side cannot be installed due to the need to install the air duct. After installing the cotton collecting hopper, the other two suction points of the carding machine can be connected to the air duct through the branch air outlet, or a one-third integrated air duct can be designed at the outlet of the cotton collecting hopper to connect the other two suction points. After connecting to the integrated air duct, it will be sucked away through the main air duct. Since the homemade cotton collecting hopper is used on the rear belly, the distance between the suction port and the lower surface of the licker-in is much smaller than before. Its sealing performance is significantly improved compared with the underground cotton hopper, and the wind speed is significantly increased. Under the same air volume, the rear The negative pressure at the belly of the car has been greatly increased, which basically eliminates the phenomenon of dust blade hanging and small leakage bottom gelatinization. The clarity of the carded cotton net is improved, and the content of card slivers is reduced, which improves the quality of the yarn.
02 Adjust the cylinder changing device of the fa209a carding machine
Solve the automatic cylinder changing failure
The linear automatic card changer equipped with the fa209a carding machine consists of an air supply system, a regulating valve, a solenoid valve and a connecting rod mechanism. In actual production, this device is prone to failure. The key points of adjustment are summarized as follows.
If the feeding tube is not in place or the thrust of the feeding tube is too large, the tube feeding regulating valve can be adjusted. If necessary, the reset regulating valve can be adjusted continuously. The adjustment of the tube feeding regulating valve has an impact on the reset. Because the tube feeding regulating valve needs to be exhausted during reset, the reset speed becomes slower when the adjustment is small and the reset speed becomes faster when the adjustment is large. The barrel feeding regulating valve is at the bottom of the column. If the feeding barrel is weak, turn the adjusting bolt counterclockwise. If the thrust is too large, turn the adjusting bolt clockwise. One rotation is appropriate each time. Then open the main valve and test repeatedly until the requirements are met. When the reset is not in place or the reset impact force is too large, the reset regulating valve under the foot pedal can be adjusted. If the reset is weak, turn the adjusting bolt counterclockwise. If the impact force is too large, turn the adjusting bolt clockwise. If necessary, you can also adjust the barrel adjustment valve continuously.
The adjustment of the strip clamp consists of air flow adjustment and adjustment of the fulcrum position at the bottom of the cylinder. If the sliver clamp is not clamped tightly or the impact force when clamping the raw sliver is too large, you can adjust the clamping regulating valve on the upper part of the cylinder. If the clamping is not tight, turn the adjusting bolt counterclockwise to increase the air volume. If the impact force is too large, turn the adjustment clockwise. Bolt, reduce air volume.
If it cannot be reset, turn the adjusting bolt counterclockwise to increase the air volume. If the reset impact force is large, turn the adjusting bolt clockwise to reduce the air volume. If necessary, the two regulating valves can be adjusted continuously. . If the air flow adjustment cannot meet the requirements, you can check the position of the fulcrum at the bottom of the cylinder. If the clamping is not tight, move the fulcrum fixing plate downward to reduce the height of the farthest point of the cylinder stroke; if it cannot be completely reset, move it upward. The angle can be adjusted if necessary.
Insufficient adjustment of the pull-off device may cause failures such as failure to pull the raw strip, excessive pull-off impact, insufficient reset, and excessive reset impact. If it cannot be pulled off or the impact force is too great, you can adjust the right side of the cylinder to pull off the regulating valve. If the pull continues, turn the adjusting bolt counterclockwise.�Increase the air volume; if the impact force is too large, turn the adjusting bolt clockwise to reduce the air volume. If it cannot be reset or the reset impact force is too great, adjust the left side of the cylinder to pull off the regulating valve, turn the adjusting bolt counterclockwise to increase the air volume; turn the adjusting bolt clockwise to decrease the air volume. The above two valves can also be adjusted continuously when necessary.
03 Change the process of the licker-in part of the fa2224 carding machine
Increase the efficiency of impurity removal
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The fa2224 carding machine is a roll-feeding carding machine designed based on the fa221b carding machine. The carding plate installed under the licker-in enhances the control of fiber bundles. In terms of opening capacity, there are 4 fixed cover plates at the front and rear of the cylinder, and cotton net cleaners are installed at the front and rear, which increases the carding area and enhances the carding machine’s ability to card and remove short lint.
The rotary cover is reversed and adopts a small heel-toe difference of 0.56 mm, which is beneficial to carding, mixing and impurity removal. A high-speed safety cleaning roller driven by an independent motor is installed above the stripping roller. The doffer adopts a frequency conversion device, and the delivery speed can reach 200 meters/minute. The overall performance of this equipment is good, but when spinning low-grade cotton or raw cotton with a lot of small impurities, the impurity removal efficiency is not very ideal. After analysis, the main reasons are as follows: the position of the pre-carding plate under the take-in roller is exactly at the second trash area under the take-in roller, so that the length of the second trash area is only 5 mm to 19 mm, and the length of the third trash area is only 5 mm to 19 mm. The length of the debris area is only 6 mm to 10 mm, and the small drain bottom is a curved light plate without mesh, which cannot effectively eliminate dust and lint at the small drain bottom; the air flow of the high-speed rotation of the licker-in cannot effectively obtain If released, it will rush into the lick-in roller cover and the cylinder back cover, which will easily cause the fiber disorder in the cotton layer in the carding area of the cotton board and the cylinder back cover, which will appear as white falling off the car belly. Although the carding capacity of the carding machine has been enhanced, the impurity removal efficiency has decreased, especially when spinning low-grade cotton or raw cotton with a lot of fine impurities. For this reason, we have modified the lick-in roller.
Replace the small leaky bottom of the original triangular light plate with a short chord length small leaky bottom with mesh, cancel the carding plate under the original licker-in, and make appropriate adjustments to the machine frame so that Install a set of aft204 carding plates, and install a dust collector with adjustable position and angle behind and below the licker-in. After the modification, the length of the first litter zone under the licker-in is 45 mm to 58 mm, the length of the second litter zone is 52 mm to 64 mm, and the length of the third litter zone is 6 mm to 15 mm. After the transformation, the trash area has been enlarged, especially the second trash area, which is more beneficial to the removal of fine impurities and dust, and can meet the impurity removal requirements in the spinning of low-grade cotton or raw cotton with more fine impurities.
After testing, the total impurity removal efficiency can reach 93% after modification, the impurity content rate of waste can reach 32%, and the impurity removal efficiency of the rear car belly can reach 75%. When the impurity content of the cotton lap is 0.8%, the impurity content of the card sliver is only 0.05%, thereby ensuring the quality of the card sliver and achieving good results. </p
