The cloth rolling device is an important part of the loom, and its function is to collect the cloth in an orderly manner after it is woven. In order to reduce the number of upper shafts, the downtime of the cloth machine, reduce the waste of cloth and labor, improve production efficiency and increase economic benefits. It is hoped that each cloth roll can wind longer cloth, so this paper proposes a design scheme for a large cloth roll device outside the machine. In order to improve the quality of the cloth roll, the tension in the cloth should be kept basically constant during the coiling process. Many designs use methods such as a single constant torque motor or a stepless speed regulating motor or even an electric control box to control the tension, which is undoubtedly It will make the structure complicated, the cost too high, and the use and adjustment inconvenient. However, this paper proposes a mechanical constant tension cloth rolling mechanism with a torque compensation mechanism, whose cloth winding torque can increase with the increase of the diameter of the cloth roll so as to keep the tension in the cloth basically constant.
图1：loom
In order to improve the quality of the cloth roll, the tension in the cloth should be kept basically constant during the coiling process. Many designs use methods such as a single constant torque motor or a stepless speed regulating motor or even an electric control box to control the tension, which is undoubtedly It will make the structure complicated, the cost too high, and the use and adjustment inconvenient. However, this paper proposes a mechanical constant tension cloth rolling mechanism with a torque compensation mechanism, whose cloth winding torque can increase with the increase of the diameter of the cloth roll so as to keep the tension in the cloth basically constant.
The take-up mechanism of the loom is generally all connected with the host at present, and the maximum cloth roll diameter of the general loom is just 300-550 millimeters due to the limitation of the structural size of the loom itself. Especially when weaving heavy fabrics such as denim and tire cord, the length of the cloth is affected by the small diameter of the cloth roll. For export products, foreign companies have certain requirements on the length of the cloth, and the purchase of cloth below 1000 meters will be restricted. Moreover, the frequent drop of cloth in small rolls not only affects the productivity of the loom, but also requires more labor, which is directly related to the economic benefits of the enterprise. Therefore, it is of practical significance to realize large rolls of cloth rolls. The large package mechanism of the loom means that after the fabric is drawn out of the weaving area, it passes through the cloth guide roller to form a larger package on the cloth winding roller. Cloth length can be increased. The large package mechanism has become a common supporting facility for high-end and high-speed looms in recent years. The use of large rolls is the development direction of the cloth machine. How to reasonably arrange the position of the weaving beam is the key issue. It is related to the tension adjustment of the entire warp beam and involves the arrangement and model of the machine. Generally speaking, it can be divided into two categories: Inward development and outward development. (1) Develop into the machine. The advantage is that the size of the car is less, but the problem is that there are many parts to be changed. The source of the accessories in the future will be solved by yourself, which will destroy the original layout of the loom and have side effects. Difficulty; and when the cloth roll in the machine is too large, it is difficult for the operator to operate, and the space for increasing the cloth roll is limited. (2) Develop outside the machine. It is simple to detach the cloth rolling device from the main body of the loom. The original mechanism of the loom can be basically unchanged or changed little, which is convenient to meet the different needs of users or equipment transformation. The problem is that the length of the loom is much smaller, and the tension adjustment is easy to exceed. limits and thus have an impact on quality. But the diameter of its cloth roll can be made very large. Large packages are generally selected to develop outside the machine. In the large take-up device outside the machine, according to whether the movement of the cloth roll is related to the main movement of the loom, the large take-up device can be divided into two types: linkage type and independent type.
图2 ：RH-D Loom Take-up Inspection Machine / Batcher Winder
1. Improve production efficiency, reduce the downtime of looms, reduce the number of upper shafts, and increase the amount of weaving; 2. Save raw materials, and waste a certain amount of cloth every time the looms are turned on and off. Increase the number of shafts, thereby saving warp yarns, and reducing the loss of gray fabrics at the seam between batches during printing and dyeing; 3. Improve labor productivity and reduce labor; 4. Increase the length of cloth, and its price will increase accordingly. In short, the adoption of large rolls is very effective in improving productivity and economic benefits of enterprises. The problems that should be paid attention to when using large packages are: the loom with separate large take-up device occupies an increased area, and it should be arranged reasonably to reduce the area of the workshop as much as possible, or reduce the number of looms to be reduced. It is necessary to consider adding auxiliary equipment for the cloth doffing, transportation and cloth finishing work of the large roll cloth roller, such as mechanical doffing trolleys, etc.
1. Selection of the position of the cloth roll The large coiling device is divided into two types: inside the machine and outside the machine. The original layout of the loom will be destroyed due to the development of the inside of the machine, and the vibration of the parts will be increased at the same time, so that the upper, lower shaft and the stop The operation is difficult, and the space for increasing the cloth volume is limited. This design requires that the diameter of the cloth roll can reach more than 1000mm, which will further worsen the shortcomings of the cloth rolling device in the machine and even fail to meet the requirements at all. Here, select the fabric winding device outside the machine for winding. 2. Selection of cloth winding power supply mode for cloth winding device outside the machine There are two schemes for cloth winding power: 1) supplied by the loom mother machine; 2) setting an independent motor. Since the configuration of an independent motor will not only increase the cost, but also require a transmission chain with a large transmission ratio to complicate the structure of the cloth winding device, and because the power required for cloth winding is not very large, it is designed to be powered by the loom mother machine. Here Chain transmission is used for long-distance transmission. The transmission ratio of the transmission chain from the parent machine to the cloth roll is determined according to the condition that the friction clutch just does not have friction or has a little friction when there is basically no cloth on the cloth roll at the beginning.
The transmission mode of cloth winding roller can be divided into peripheral transmission type and axial transmission type. Due to the outer peripheral transmission type, it is necessary to design a set of friction rollers that drive the rotation of the cloth roll by the friction force of the outer circumference, and in order to prevent the force between the fabric package and the friction roller from changing due to the increase in the weight of the package, generally do not allow The friction roller bears the load, and the weight of the fabric package is borne by other devices (such as hydraulic devices), because as the cloth roll increases, its axis position continues to move upwards, which requires the load-bearing device to change accordingly from time to time, which in turn will Make whole cloth rolling device become huge and complicated. Therefore, the shaft center transmission type is selected, and its structure is simple. The cloth rolling roller shaft is directly fixed on the frame, and is driven by gears to rotate to carry out cloth rolling.
Post time: May-16-2023
