ontleding van 'n paar probleme by die werklike gebruik van huishoudelike raamdraaiers
Jul 23, 2021
1) take-up and pay-off device
in order to improve the quality of the stranded wire, reduce labor intensity, and shorten the estimated ground length of the frame stranding machine, walking type take-up and pay-off devices have been generally used to replace the past fixed take-up and pay-off racks.
2) threading die
The threading die is a vulnerable part in therigid frame Strander The original bakelite material has been gradually changed to nylon and ceramics over the years.
in Danggang steel materials, the current life of aluminum steel materials is 4-5 times longer than that of the previous Taolu materials.
3) supporting components
in recent years, equipment manufacturers have paid more and more attention to the quality of their products. in order to solve the air leakage and oil leakage of the frame twisterand improve the stability and reliability of the system, domestic famous brand products or Sino-foreign joint ventures should be selected as much as possible in the design. pneumatic components and hydraulic components; now there are also imported components, but the price of the equipment should be higher. at the same time, improve the precision of machining, select the supporting factory for heat treatment, and ensure the quality of heat treatment of parts, so as to continuously improve the equipment The quality of manufacture and use reduces unnecessary maintenance.
4) twisting cage body drive
in the frame stranding machine, the drive of each section of the frame stranding cage generally has two forms: one is that the frame stranding cage body is driven by the ground axis, the stranding cage gearbox drives the stranding cage body to rotate, and the operating handle can realize the reversing and idling rotation of the stranding cage. , Reliable, simple, low cost, in line with the traditional operating methods of cable manufacturers, accepted by the majority of cable manufacturers: in recent years, more and more equipment manufacturers have digested and absorbed the advanced level of foreign frame stranding machines and adopted each section of the winch cage is driven by a separate dc motor. The dc motor is decelerated and driven by the secondary synchronous belt, and the frame winch starts slowly and smoothly; the operating parameters of the whole machine are set by the computer, and a pair of switches control automatically increase and decrease the speed slowly to ensure the frame , traction and take-up are synchronized to ensure that the wire pitch remains unchanged when the equipment starts, accelerates, decelerates and stops. The split transmission frame twister has no shaft and gearbox, which simplifies the structure and greatly smoothes the production site. at the same time, it also greatly reduces the mechanical maintenance cost of the equipment. it is the development direction of the domestic frame twister.
5) safety device
With the gradual promotion of mechanical upper and lower reels, the automatic winding has adopted an air thimble to tighten the upper reel. after the winding reel is tightened, a mechanical safety device is installed. at the same time, a limit control main motor is set on the mechanical safety device. When in the safety position, the main motor can be started. after continuous improvement and perfection, the rotary air joint and its sealing device in the frame twister now have a fairly good use effect.
6) tension control
The single wire tension of the traditional stranding machine is uneven, and the pay-off tension on each pay-off reel is also inconsistent, which seriously affects the quality of the stranded wire. The frame winch is mostly pneumatically controlled, and the tension of the wire reel is controlled by pneumatic tension. The tension is automatically controlled by the pressure regulating proportional valve to ensure that the tension of the wire reel is even from the full reel to the empty reel. there is an uninterrupted air source device on the twisting cage.
7) disconnection control
With the continuous increase of the speed of the frame winch, the instruction of the disconnection stop device is required to be agile, and the winch cage brakes quickly and smoothly. The disconnection parking device of the new frame twisteradopts a non-contact probe to directly control each spool. as long as one of the spools is disconnected and stops, the broken frame number can be displayed on the console and the machine will stop in time. The length of the broken wire is about 1.5-2 meters to ensure the repair after the broken wire. The impact and damage of emergency braking to the equipment is very severe and should be minimized; therefore, the braking of the frame winch is usually divided into emergency braking and normal braking, and the normal braking time is longer.
8) traction device
frame stranding machine usually adopts double-wheel traction, and there are several structures of double-wheel traction, such as single-active, double-active, single-slotted wheel and double-slotted wheel, which should be selected according to the maximum traction of the stranded product. Among them, the line splitter is a natural line splitting to avoid wire core scratches during the line splitting process; the traction sheave uses an r groove and is equipped with a pneumatic crimping device to prevent the cable from loosening to prevent the cable from slipping when driving after parking.
9) Pre-deformation device
The frame stranding machine cannot be twisted back. When stranding the wire, internal stress is generated inside the single wire, which causes the wire to be twisted not tightly, and it is easy to loose strands, which brings trouble to construction. Therefore, in the production of overhead conductors, a single-wire pre-deformation device should be installed in front of the splitter plate of the stranding cage to eliminate the internal stress of the single-wire, and it can be removed at any time when not in use.
10) compression device
in order to reduce the diameter of the conductive core and save materials, power cables, especially cross-linked cables, usually use compacted cores, with a compaction coefficient of about 0.85 to 0.9. The process of each factory is different, and it can be pressed by a mold or a roller. in order to facilitate layered compaction, after each section of the stranding cage, a set of paralleling mold bases and pressing devices are equipped, and the paralleling mold bases can be adjusted back and forth; the paralleling mold bases can be twisted or pulled at one time. compression stranding; the rolling press roller frame is used to produce the rolling compaction of the sector-shaped conductor.
11) Pre-twisting device
The frame twister can be equipped with a pre-twisting device according to the needs of users, and the cable cores with a cross-section greater than 800mmz should use split conductors to reduce the skin effect of the cable. The transmission system of the traditional twisting machine's pre-twisting device is quite complicated, and the advance speed is driven by the earth axis, and the pitch adjustment will cause accumulated errors; the single dc motor drive frame twisting machine uses a separate dc electric drive pre-twisting device, pre-twisting joints The pitch is steplessly adjusted, and the high-precision electrical synchronization technology is used to automatically track the change of linear speed to ensure the stability of the pre-twist pitch. Our requirement for the pre-twisting device is that the pre-twisting pitch should be the same as the cable pitch after splitting the wires.
12) centralized upper and lower disks
in order to reduce auxiliary time, reduce labor intensity, and improve productivity, more and more factories choose frame twisting units with centralized upper and lower disks. The centralized upper and lower devices can automatically complete the entire process of grabbing, turning, walking, and loading in sequence. convenient and reliable. common forms of upper and lower trays include top hoisting, bottom jacking, ground level flipping, and side bottom 30° flipping. at present, two forms of horizontal flipping on the ground and 30° flipping on the side are commonly used; the former is faster than the latter, but the estimated land area of the upper and lower parts is about twice as large. The factory can choose according to its actual situation.
13) wire reel configuration
in order to greatly improve the production capacity of the equipment, give full play to the variable speed function of the existing frame winch gearbox; some equipment manufacturers, in view of the frame winch in production and use, the speed of the front winch cage is faster, and the speed of the rear winch cage is slower. Phenomenon, the product design has been improved, and the number of spools on the front and rear frames of the frame twister has been appropriately changed. For example, some of the first three sections of the 18-reel (including 18-reels) frame-type winch cage are equipped with three wire reels (that is, 120° uniform distribution) on each level of each segment, and the frame-type winch cage after 18 reels in the above, each section of each section is equipped with four wire reels (that is, 90° uniformly distributed); there are also the first four sections of the 24 reels (including 24 reels) frame-type winch cage, all of which are on each section of each section. equipped with four wire reels (i.e. 90° uniformly distributed), and the frame-type stranding cage after 24 reels is equipped with five wire reels on each level of each section (ie 72° uniformly distributed); the above two kinds of wire reel configurations The structure has been proved to be feasible in practical applications.
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