Category: Chains and sprockets

The main reasons for dynamic loads generated by chain sprockets and chain drives during operation are

(1) The chain speed and the angular velocity of the driven sprocket change periodically, thus generating additional dynamic loads. The greater the acceleration of the chain, the greater the dynamic load will be. As can be seen, the higher the rotational speed of the sprocket, the larger the pitch of the chain and the smaller the number of teeth of the sprocket, the dynamic load will increase. (2) The velocity of the chain along the vertical direction also changes periodically, which makes the chain vibrate transversely, and this is also one of the reasons for the dynamic load of chain transmission. (3) When the chain link enters the sprocket, the chain link and the sprocket...

The main forms of failure of roller chain drives

The main failure forms of chain transmission are as follows: (1) Fatigue damage of chain plate Chain will be fatigued after a certain number of cycles under the repeated action of loose side tension and tight side tension. Under normal lubrication conditions, fatigue strength is the main factor that limits the load carrying capacity of chain transmission. (2) Impact fatigue damage of roller sleeve The impact of chain transmission is firstly borne by roller and sleeve. Under repeated impacts, after a certain number of cycles, the roller and sleeve...

Heat treatment of 45 gauge steel for gear sprockets

According to the requirements of the sprocket gear: if the impact force is small in the case of small can be its surface carburizing, nitriding and other technologies! So that the surface hardness is higher, and the matrix hardness is lower, wear resistance is good, and not easy to fracture. If the impact load is large, it is due to the tempering treatment, that is, high temperature tempering. 45# steel quenching temperature in about 580 degrees, holding time has a formula, according to your equipment, the size of the workpiece, shape, and then quenching, and then with about 500&#8...

Analysis of the design calculation of roller chain drive

1. Failure of chain transmission 1) Fatigue damage of chain When the chain is working, the chain on both sides of the sprocket is tensioned and slackened at the same time. The chain is constantly moving from the loose side to the tight side, so its components are working under variable stress. After a certain number of cycles, the chain plate will be fatigued and broken, or the surface of sleeve and roller will be fatigued and pitted (impact fatigue caused by polygon effect). Therefore, the fatigue strength of chain becomes the main factor in determining the load bearing of chain drive...

Analysis of the treatment of different materials of sprockets and gears

The materials used for making sprockets and gears are generally based on the purpose, and the materials used are gray cast iron, low carbon steel, medium carbon steel, low carbon alloy steel, medium carbon alloy steel, etc. The materials used are as follows. (HT20-40, HT25-47, HT30-54, 45# steel, 40Cr, 40MnB, 15, 20, 20Cr, 18CrMnTi, 35CrMo) The heat treatment of the gears made of gray cast iron material is de-stressed annealing, the gears made of low carbon steel material are carburizing quenching, the gears made of medium carbon steel material are high frequency quenching, some are medium temperature tempering, some are ...

Chain wheel chain in the scraper conveyor card chain or broken chain cause analysis

Failure: One of the main functions of the scraper conveyor in the synthesized mining face is to transport the lumps of coal cut by the coal mining machine, and this function is realized by the chain installed on the scraper conveyor. The chain itself is an elastomer, and the uncertainty of the amount of coal cut by the coal mining machine leads to inconsistency in the weight of the coal blocks carried by the scraper conveyor chain. After a long time of operation, the chain of the scraper conveyor will slacken, if not dealt with in time, it will lead to safety accidents such as broken chain, stuck chain, stacked chain, etc., and in serious cases, it will affect the...

Analysis of the simple calculation method of sprockets

First, the number of teeth of the sprocket Z is calculated according to the transmission ratio ι: ι = n1/n2 = Z2/Z1 where: n1: small sprocket rotational speed n2: large sprocket rotational speed Z1: small sprocket teeth Z2: large sprocket teeth. Second, the sprocket's indexing diameter of the circle D D = P / [sin (180 degrees / Z)], sprocket is not more than gears, as long as you give the "number of teeth, the row and the type of chain" can be. The number of teeth, the number of rows and the type of chain can be given. Because the tooth type of the sprocket and some other important dimensions and so on...

The main forms of failure of roller chain drives

The main failure forms of chain wheel and chain transmission are as follows: (1) Fatigue damage of chain plate Chain in the repeated action of loose side tension and tight side tension, after a certain number of cycles, the chain plate will be fatigue damage. Under normal lubrication conditions, fatigue strength is the main factor that limits the bearing capacity of chain transmission. (2) Impact fatigue damage of roller sleeve The impact of chain transmission is firstly borne by roller and sleeve. Under repeated impacts, after a certain number of cycles, the roller...

Analysis of gear design to take full account of process issues

Gear products, because of their special characteristics, must be designed to take into account the effects of their blanks, machining, heat treatment and testing. Manufacturing-testing integration can optimize materials and processes, quantitative evaluation, help decision-making, and improve product power density. Especially for arc gear bevel gears, because of its tooling for non-standard design, the same series as far as possible to achieve generalization and serialization. In addition, gear design, but also focus on its heat treatment deformation of the impact, such as not to make the top of the tooth is too sharp, and the root of the tooth...

Finishing of gear sprockets and racks

Current industrial applications of gear finishing methods are mainly shaving, grinding, extrusion, research and honing. Shaving is in the shaving machine with shaving cutter shaving, is a method of gear finishing, shaving cutter is equivalent to the tooth surface opened a lot of edge of the helical gear. It drives the relative rotation of the gear being processed, as staggered shaft gear meshing, relying on the relative sliding on the tooth surface, shaving cutter cut off a very thin layer of metal on the tooth surface, to complete the gear finishing, shaving machine skateboard adjustments to ensure that the gears...

Double chain tooth drive roller conveyor, how to determine the roller between

For example, how should the center distance between rollers be determined for a roller conveyor with double chain tooth drive? Of course, first of all, the center distance should be initially determined according to the structural requirements. However, the structural requirements of the center distance is not necessarily in line with the results of the calculation of the length of the chain link, so it is necessary to calculate the completion of the actual number of links according to the number of chain links in turn and then adjust the size of the center distance. After rounding the number of links should be taken as an even number, this is to avoid the transition link, with the transition link, can withstand the load to be small 20% or so. Left and right two...

Analysis of the unevenness of motion in chain drives

The chain enters the sprocket to form a folded line, so the motion of the chain drive is very similar to that of a belt drive wound around a square polygonal wheel, see Fig. 9. The length of the side corresponds to the chain pitch p, and the number of the side corresponds to the number of teeth of the sprocket wheel z. For each revolution of the sprocket wheel, the chain moves by a distance of zp, and let z1 and z2 be the number of the teeth of the two sprocket wheels, p be the pitch (mm), and n1 and n2 be the rotational speed of the two sprocket wheels (r/min), then the average velocity v (m/s) of the chain is v=z1pn1/60*1000=z2pn2/60*1000 The average speed v (m/s) is v=z1pn1/60*1000=z2pn2/60*1000 ...

Processes included in the machining cycle of gears

Sprocket gear machining is an extremely complex process, and only by utilizing the correct technology can efficient production be made possible, and each part of the production process must also be of extremely precise dimensions. Gear processing cycle includes general turning → hobbing → gear insertion → shaving → hard turning → grinding → honing → drilling → bore grinding → welding → measurement, for this process to configure the appropriate clamping system is particularly important, next we will introduce the various...

Analysis of rack manufacturing process methods and control measures

(1) Rough machining This sequence is the process of transforming from blank to semi-finished product. In order to reduce the cost and improve the machining efficiency, it is arranged on the Czech Skoda W200H digital floor boring machine, using φ 200mm cutter, φ 315mm three-face milling cutter and φ 25mm cutter for machining. First of all, φ 200mm cutter is used to process 6 faces of the rack, leaving 10mm machining allowance on one face, and then φ 315mm three-face edged milling cutter is used on the universal angle head to cut a straight groove along the tooth contour, and then the workpiece is stood on its side, and φ ...

The use and maintenance of garage sprocket chain drive

Correct use and maintenance of chain drive has a decisive influence on reducing the wear of chain and improving the service life of chain drive. The use and maintenance should pay attention to the following points: 1. Reasonable control of processing error and assembly error Reasonable control of the pitch error (the difference between the specified pitch and the actual pitch) should be less than 2%; the offset between the two sprocket wheel tooth end surfaces (i.e., sprocket wheel offset) should be less than 2% of the center distance; the two axes should be parallel, or it will result in the skewing of the chain's rollers to the tooth surfaces, which will result in a very high one-sided pressure ...

Causes and consequences of root cut in gears

The reason for root cut: when the intersection of the tool tooth top line and the meshing line exceeds the meshing limit point N1, the tool continues to move from position Ⅱ, it will be the root has been cut out of the involute tooth profile and then cut off part of it. Consequences of root cut: produce serious root cut gear, on the one hand, weaken the bending strength of the gear teeth; on the other hand, will make the gear transmission of the degree of cooperation has been reduced, which is very unfavorable to the transmission. The reason for root cut: when the intersection of the tool tooth apex line and the meshing line exceeds the meshing limit...

Analysis of magnetic gear product features dust-free environment

What is a Magnetic Gear? Magnetic Gear (Magnet Gear), also known as Magnetic Wheel, is a non-contact power transmission device that utilizes the principle of the interaction between the suction and repulsion forces of magnets. Product Features Dust-free environment: Using magnetic force, torque transmission can be utilized in a non-contact state to transmit products within a vacuum that requires a dust-free environment. Low gas emission: Large machines to vacuum machine, in order to reduce gas emission, according to the special surface treatment, can be used in the environment of 10-5PA. Ultra low...

Arrangement, tensioning and lubrication of sprocket chain drive

1, the arrangement of chain drive Chain drive should be generally arranged in the plumb plane, avoiding as far as possible to be arranged in the horizontal or inclined plane. If it is really necessary, it should consider adding devices such as pallets or tensioning wheels, and designing a more compact center distance. 2、Tensioning of chain drive Purpose: To avoid poor meshing and chain vibration phenomenon when the pendant of the chain is too large; meanwhile, increase the wrapping angle of the chain and sprocket. When the angle of inclination of the line connecting the centers of the two wheels is more than 600, a tensioning device is usually provided. Tensioning...