Electromagnetic clutch expansion sleeve and coupling
Electromagnetic clutch is used in the transmission system of rapier looms, air-jet looms and water-jet looms, which can realize the rapid and reliable combination, separation, power transmission, braking and positioning of active components and passive components. The clutch (picture below) is composed of four main components: brake yoke assembly 1, clutch yoke assembly 4, armature assembly 2, and rotor assembly 3.
The working principle of the clutch is that when the clutch yoke is energized and the brake yoke is de-energized, the clutch yoke generates electromagnetic force to attract the armature through the rotor, causing the rotor friction plate and the armature to generate a certain friction force, achieving a reliable combination of the active part and the passive part. , transmit power and make the loom operate. When the brake is energized and the clutch is de-energized, the brake yoke generates electromagnetic force. The electromagnetic potential of the clutch yoke disappears. The armature detaches from the clutch yoke and rotor with the help of the elastic force of the spring leaf. The brake yoke attracts the armature, causing the armature and brake yoke to disengage. Friction plates generate friction. The clutch generates electromagnetic force when the magnetic yoke is energized to attract the armature. The armature and the friction plate generate friction to transmit power. Therefore, the gap between the armature and the rotor friction plate must be adjusted between 0.3 and 0.5mm. You can use the gap adjustment plate 5 (Figure 18- 1) Adjust to the best position. 1. Single-plate electromagnetic clutch The electromagnetic clutch in shuttleless looms is a special clutch within the range of single-plate electromagnetic clutch products. Its products are mainly divided into combination clutches, electromagnetic brakes, electromagnetic clutches and tooth clutches. The specifications, parameters, performance, installation dimensions, braking torque (dynamic torque), transmission torque (static torque) and other performance indicators of this type of product are all based on meeting the needs of new looms. Produced by well-known professional clutch manufacturers in Germany, Japan, and the United States, they have successfully extended the effective structure theory of multi-plate electromagnetic clutches to single-plate electromagnetic clutches dedicated to looms, improved the traditional structure of single-plate electromagnetic clutches, and perfected the clutches dedicated to looms. Structural performance greatly improves the performance of this product. For example, the armature structure has progressed from a single magnetic circuit and a single armature to a dual magnetic circuit and a single armature, and a dual magnetic circuit and a dual armature, thereby reducing the weight of the armature. On the basis of not changing the original structural dimensions of the clutch or brake, the torque of this type of product can be doubled, adapting to the demand for increased speed of shuttleless looms, and promoting the progress and efficiency of the loom. Compared with general-purpose clutches, this type of product does not come in series, is updated quickly, and will be eliminated with the update of looms. The realization of high speed, high efficiency and high reliability of modern new shuttleless looms is closely related to the development of special clutches for looms, which has become a new development category of single-chip electromagnetic clutches. Some special clutches for looms are general-purpose clutch variants, while others are specially designed for looms. No matter what type of product, they must meet the requirements of the loom for installation, debugging, maintenance, high transmission torque and high braking torque, and realize the characteristics of shuttleless looms such as quick starting and quick braking. Single-plate electromagnetic clutches and brakes, combined clutches and electrostatic actuators are all dry-type single-plate without slip rings. They have the characteristics of compact structure, fast response, long life and reliable use. They have been widely used in fabric machinery products and device. The electromagnetic clutches and brakes used in these machines and devices are mainly used as automation actuators. In order to ensure the service life of clutches and brakes, the friction plates of electromagnetic clutches and brakes, combination clutches, power-off brakes and other products must use high-performance, high-temperature-resistant non-asbestos-based friction materials. 2. Classification of electromagnetic clutches (1) Electromagnetic clutches are divided into DLD5-40 type, DLD6-160A type, DLD6-160/F type, DLD6-160/E type, DLDF-350 type and DLDF-550 type. (2) Electromagnetic brakes are divided into DZD5-80/A type, DZD5-160 type, DZD5-160/A type, DZD5-160/C type, DZD5-160/D type, DZD5-160/F type, DZD5-160A Type, DZDF-350, DZDF-550, DZDF-320/C, DZDF-320/D, DZDF-320/E, DZD5-320/X and DZD5-250/B. (3) Combined clutches are divided into DLZF-350Ⅰ type, DLZF-350Ⅱ; 450Ⅰ; 500Ⅰ type, DLZF-400 type, DLZF-450Ⅱ type, DLZF-500Ⅱ type, DLZF-500Ⅲ type, DLZF-600 type, DLZF-900 type , DLZF-900A type, DLZF-1000 type, DLZF-500ⅡA type, DLZF-850 type, DLZF-350I type, DLZF-350IV type, DLZF-1100 type and DLZF-1100A type. (4) Dog clutches are divided into DLFY-200 type, DLFY-900 type, DLFY-566 slow speed type, DLFY-566 weft-finding type and DLZF-500 type, etc. 3. Teeth electromagnetic clutch Teeth electromagnetic clutch is developed on the basis of tooth mechanical clutch. The tooth shape part is basically the same as that of tooth mechanical clutch, and there are various forms such as trapezoid, triangle, symmetrical teeth, asymmetric teeth, etc. According to the tooth shape, it can be divided into two categories: fine teeth and coarse teeth. According to the action, it can be divided into positioning teeth (unequal spacing teeth) and non-positioning teeth (symmetrical and asymmetric equidistant teeth), power-on and power-off types. Like ordinary electromagnetic clutches, early dog-type electromagnetic clutches were powered by slip ring brushes. Modern new dog-type electromagnetic clutches all adopt the basic structure of a single-plate electromagnetic clutch, that is, the armature and rotor are replaced by end-face toothed discs, and the yoke is fixed The non-rotating power supply is convenient and improves the reliability of the product. The action of the tooth-engaged power-off positioning clutch is the same as that of the tooth-engaged power-off clutch, that is, it disengages when powered on and combines when powered off (de-energized). However, the difference is that the end teeth are unequal teeth during combination, which ensures that the relative position is correct each time the combination is performed. constant. Tooth impaction loss of ionizationThe device is mainly used in environments where the combined state is greater than the disengaged state, or the work does not allow for overheating and sparks. In addition, tooth-engaged power-off positioning clutches are also used in situations where positioning is required. Compared with other electromagnetic clutches, tooth-type electromagnetic clutches have a larger torque volume. There is no loss of speed and no slip. It is more suitable for situations where the transmission ratio is particularly strict and the branches are leisurely. Generally used in situations with small space and low speed and high torque. It is not suitable to be used in high-speed transmission systems. When selecting, the torque safety factor is large, at least 2.5 to 3.0 times of the rated torque. The dog clutch is very sensitive to vibration and eccentric installation. The rated torque decreases as the speed increases, and its decrease rate is due to The end face tooth shape and structure are different. When the dog clutch speed exceeds the rated speed of the motor (above 1500r/min), the safety factor should be 6 to 7 times the rated torque of the motor. If the torque capacity is selected to be too small, the clutch will automatically disengage before the motor loses control when transmitting large torque. At this time, the transmission characteristics of the dog clutch cannot be maintained. 4. Expansion coupling sleeve The expansion coupling sleeve is an advanced mechanical basic component widely used in the world for mechanical connection under various loads. It is used to install the connection between the electromagnetic clutch and the main shaft. European and American countries first used this new technology in heavy-load machinery. Now it has been extended to various other machinery industries. The expansion coupling sleeve began to be used internationally in the early 1970s. my country developed this product in the early 1980s and first promoted it in various heavy machinery. In 1986, the country formulated the standard GB5867-86 for general-purpose expansion sleeves. After nearly two decades of practice, the development of all specifications and varieties in this standard has been completed, and it has been promoted to various machinery such as general machinery, promoting the technological progress of products in the machinery industry. Expansion sleeve connection is a new type of connection method. It relies on tightening high-strength bolts to generate positive pressure between the expansion sleeve and the shaft or between the containment surfaces of the sleeves, accompanied by friction, and a keyless connection device that realizes load transmission. It has many unique advantages and characteristics compared with the traditional mechanical connection methods of general interference keyless connection and keyed connection. (1) Simple manufacturing and installation: The arrangement of the shaft and hole for installing the expansion sleeve does not require high-precision manufacturing tolerances like interference fit. There is no need to heat, cool or use pressurizing equipment to install the expansion sleeve. You only need to tighten the screws to the specified torque. Just tighten it. (2) It has good interchangeability and is easy to disassemble: when disassembling, just loosen the compression bolt, and use the ejection bolt to tighten and pressurize, then the coupling state can be released, and the expansion sleeve and coupling parts can be separated. (3) The expansion sleeve connection can withstand heavy loads: its structure can be made into a variety of styles. In order to meet the installation load needs, if one expansion sleeve is not enough, multiple expansion sleeves can also be used in series. (4) The expansion sleeve connection is a precise, gap-free, keyless connection, which has the advantages of high transmission accuracy and efficiency, long service life, and is not prone to corrosion. There is no relative sliding during work and no wear. It is very suitable for use in various high-precision transmission and servo mechanisms. (5) When the expansion coupling sleeve is installed in the axial direction, the required axial position size and the relative position of the parts can be easily adjusted without any axial fixation. (6) With the expansion of application scope, various complex connection forms in machinery can be replaced by very tight coupling sleeves. Simplify the transmission structure or become an integral part of mechanical parts, such as a gapless diaphragm coupling. (7) The selection of expansion sleeves can increase the commercialization rate of host equipment and facilitate the advancement and development of host technology and product updates. (8) The expansion coupling sleeve can work in the temperature range of -30°C to 200°C, and can be made of a variety of different materials according to the working environment and medium. 5. Coupling A coupling is a device in a mechanical transmission system that connects two shafts or shafts and rotating parts, and rotates synchronously without disengaging during the transmission and power process. Couplings are born with mechanical products. In order to meet the needs of various mechanical transmission and installation methods, there are many types of couplings. But they are mainly divided into two categories: rigid couplings and flexible couplings. Due to the inability to adjust the radial and angular deviation between the two shafts and the large moment of inertia, rigid couplings are rarely used and have been eliminated in modern machinery. The flexible coupling also serves as an elastic element in the shaft system to adjust frequency, dampen vibration, compensate for the relative displacement of the two axes, buffer and provide safety. Generally divided into non-elastic element couplings, non-metallic elastic element couplings and metal elastic element couplings. In addition to the former’s function of compensating the relative displacement of the two axes, the latter two also have buffering and vibration-damping functions. However, their ability to transmit torque is generally inferior to the former due to limitations in the strength of the elastic elements. Parallel axis coupling can be used to connect two axes on the same axis. In addition, other rigid couplings are rarely produced by professional coupling manufacturers. New couplings generally refer to advanced products in flexible couplings. As electromechanical products develop toward high speed, high efficiency, and high precision, couplings with traditional structures can no longer meet the needs of development. With further research on new materials, new technologies and new processes, some traditional product structures and materials have been eliminated and updated, and new couplings have also emerged and are gradually gaining favor from users. For example, plum blossom elastomers adopt large damping materials to increase the natural frequency and damping coefficient, making the vibration damping performance extremely high. The elastic deformation of its plum blossom-shaped elastomer is not achieved by the Poisson effect, but by the arc-shaped surface that is easily deformed during work, which is more advanced than the traditional structure. There are also drum gear couplingsThe device and the middle inner gear sleeve are made of organic materials with high elasticity, high strength, oil resistance, corrosion resistance and impact resistance. In order to meet the requirements of high speed, low inertia and no gap in modern mechanical transmission, diaphragm couplings and shaft connections adopt pairs of expansion rings to achieve keyless connection. The diaphragm coupling adopting this structure is more suitable for use in servo drive system transmission machinery to control the transmission gap, reduce the dead zone of the servo system, and improve the positioning accuracy and servo performance of the mechanical transmission. The expansion coupling sleeve is a new type of coupling piece that can achieve keyless coupling. The product structure of the new coupling has been relatively complete, and it is combined with other transmission parts such as safety clutches to form new transmission parts products. There are many types of couplings, with more varieties and specifications. Currently, the most commonly used ones are diaphragm couplings, plum blossom couplings, drum gear couplings, cross-shaft universal couplings and expansion sleeve couplings.
AAA57865ERT34GSD
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