New full spur gear drive bending machine
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Rebar bending machine is widely used in the bending forming of steel bars in bridges, highways, tunnels, power stations and other construction projects. It is one of the most important steel bar processing equipment. In the future, steel bending machines will continue to play an increasingly important role in various large-scale construction projects. However, China's steel bending machine has been using worm gear for many years. This kind of transmission has many shortcomings. Therefore, it is necessary to explore the new method of the full spur gear transmission of the bending machine. The working principle and shortcomings of the 1GW40A bending machine 5-worm wheel; 6-work disk; 7-large box; 8--frame body bending machine drive system wheel, working disk for circular motion, complete the bending of the steel bar. Here, the two pairs of shifting gears 3 are completely exposed, and the worm gears are sealed in the casing. This worm gear drive has the following disadvantages: 1 worm gear transmission efficiency is low, generally 6 (% ~ 75%; 2 due to the considerable sliding speed between the worm gear mesh surface, the tooth surface is prone to wear and heat, The requirements for lubrication conditions are high; 3 worm gears are difficult to process and are not suitable for mass production; 4 worm gears are highly neutral to assembly, and measurement, adjustment and processing are complicated during assembly; 3 due to the high working strength of the bending machine The worm wheel is more prone to wear, especially in the case of lack of oil, the worm wheel wears out quickly, the interchangeability is not good when replacing the worm wheel, and the replacement is difficult; 6 because the working environment of the bending machine is relatively bad, the exposed gear is greased It will soon be smashed, which will pollute the working environment and make the lubrication quality of the gear difficult to guarantee. The life of the gear is short.
Therefore, based on years of experience, after analyzing the user's investigation and analysis of the information collected by the domestic and foreign bending machines, we designed a curved machine GW40B with full spur gear transmission instead of the GW40A bending machine. GW40B bending machine transmission system see the characteristics of 2GW40B model Table 2 Short stress line without archway small rolling mill structure characteristics No. Main structural features Main measures taken 1 The rolling mill has high rigidity; small elastic deformation; high dimensional accuracy. The larger diameter of the screw is used; the moment of inertia and the cross-sectional area of ​​the bearing housing are increased; and the bearing condition of the bearing with four rows of short roller bearings is improved. A floating ring of the bearing seat is arranged between the tie rod and the bearing seat to compensate for the bending of the roll, thereby greatly reducing the bearing eccentric load. The service life of the equivalent bearing on the rolling mill can be increased by 5%. The bearing seat with special structure is cancelled. The concentrated pressing screw is transferred by the screw at both ends of the bearing to make the rolling 9-4 rolling line constant; the roll gap adjustment is fast, the fine sulfur roll gap is driven by the hydraulic motor and the reverse thread is used. The root rod is used to realize the symmetrical adjustment of the high and low speeds. The rolling has a reliable axial self-locking property; the gap between the rod and the nut thread can eliminate the axial fine adjustment mechanism of the roller, so that the well-adjusted hole type will not be Misalignment occurs; the bearing housing is equipped with hydraulic balance 6 rolling mill fluid (such as: water hydraulic oil, dry oil) control is convenient to use automatic quick joint fluid coupling with the rolling mill and the drive shaft connection (disengagement) and automatically turn on (cut off) 7 rolls Automatic engagement with the drive shaft. The drive shaft is equipped with a special support system to balance the two drive shafts. 8 working machine seat interchangeability The same size of the machine frame can be used for any position on the rolling line, and the horizontal machine base can be used for the vertical rolling mill to effectively reduce the number of spare parts and replacement parts. The mill operation rate is high. The change roll is realized by replacing the work machine seat. In the middle of the change roll, the finishing mill part is equipped with a quick roll change device for online quick change. 10 The product has high quality, many varieties, and has high production flexibility. The rolling mill has flatness. Three types of vertical and horizontal erecting can be converted, and the appropriate rolling mill configuration can be selected according to the process requirements. 3.2 It can adapt to the production of various varieties (different cross-sectional shapes).
3.3 Can be used as a complete set of small rolling line 3.4 Large rolling speed range, final rolling speed up to 18m / s 3.5 can be used for wire mills of coarse, medium and pre-finishing mills 3.6 can be used for various small, wire production plant partial transformation The mill needs to be replaced and can significantly improve the physical quality of the product.
4 Application examples Now take the application of high-rigidity rolling mill as an example: the workshop was originally 0 4<3/250 (5/170<8 (45 rolling mill) semi-continuous wire rolling workshop, the product is 0 5.08 wire, the production capacity is about 60,000 Tons of years.
To improve production and product quality. Expanding the variety, directly adopting 120<120 continuous casting billet as a fire material, improving economic efficiency and enhancing the adaptability to the market, and adopting a high-rigidity rolling mill for technical transformation. After the transformation, it is a semi-continuous rod. Line compound production line, the main production conditions and equipment are as follows: annual output: 150,000 tons, of which 18,000 tons of wire rod, bar 132,000 tons of raw material specifications: 12 (K120 continuous casting billet or rolling billet product specifications: wire is 0 12~032 round steel and reinforced rolling mill consisting of: rough rolling mill 0550 three-roll mill, one medium rolling mill, 0400 three-roll mill, one bar finishing mill, 0300 two-roll mill, six flat alternating lines Rolling mill 0170 two-roll mill 2, 45 mill rolling speed: bar mill up to 12m / s wire mill up to 36m / s the rolling mill's bar finishing mill, that is, the wire mill's pre-finishing mill used 0300 The high-rigidity rolling mill and the associated cold bed equipment play an important role in improving the workshop operation rate and improving the product quality.
(Continued from page 73) 2.1 Transmission efficiency is 20% higher than the original bending machine - 2.2 fully enclosed structure, all with grease lubrication, regular refueling, simple and reliable lubrication 2.3 Gear machining is simpler than worm gear, easy to organize production 2.4 pairs of assembly There is no need for measuring and padding, the assembly process is simplified, and the efficiency is correspondingly improved. The structure and advantages of the 3GWM0B bending machine can be seen from this, and the design has a breakthrough in structure. The machine is divided into two boxes, and they are independent of each other, and they can be assembled after being assembled. Due to the closed type, the lubrication quality is guaranteed, and the gear life is prolonged compared with the GW40A bending machine structure. At the same time, there is no oil pollution to the working environment. The advantage is that an output shaft is used for the small bending machine gearbox below 032. The large bending machine gearbox of 040~050 can also adopt two sets of output shafts at the same time, which can reduce the modulus of the large gear 5, which is very beneficial to the design and processing. 1 Because there are two gears 4, it can mesh with the large gear 5 at the same time, and the force is greatly increased. improve. 2 According to the strength calculation, one gear shaft 4 is meshed with the large gear 5 by an output shaft, and the two output shafts are meshed with the large gear 5, and the modulus can be reduced by 70%. If the gear diameter is assumed to be maintained The original size, due to the increase in the number of teeth, the final gear ratio can be increased appropriately, the transmission ratio of the gearbox is correspondingly reduced, and the speed of the gear and the shaft is correspondingly increased, and the outer dimensions of the shaft bearing are correspondingly corresponding. Become smaller. Secondly, the outer diameter of the large gear 5 can be appropriately reduced, because the size of the large gear 5 determines the size of the overall size of the whole machine, which will reduce the overall size of the whole machine. Third, the machine tool specifications of the processing gear and the modulus of the hob are also small, so the processing cost of the whole machine can also be reduced. At this time, the general manufacturer's machine tools and hobs are basically ready to meet the processing requirements, and no need to be added. Due to the addition of a set of output shafts, the cost of the new equipment 3 will increase accordingly. However, for the reduced cost of the whole machine and the benefits of the whole machine, the benefits brought by its structure still outweigh the disadvantages.
Due to the above structure, under normal conditions, the overall performance of the bending machine can be increased by about 15% compared with the original bending machine, and its working life can be extended by 2 to 3 years.