CN214391620U - Novel steel rolling production line adopting cutting type cogging - Google Patents
Novel steel rolling production line adopting cutting type cogging Download PDFInfo
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Abstract
The utility model belongs to the technical field of metallurgical industry steel rolling technology and steel rolling, especially, relate to a novel steel rolling production line that adopts cutting formula cogging, its characterized in that includes steel billet firing equipment, the cogging unit that is connected with this steel billet firing equipment, the online heat preservation and the temperature compensation system that are connected with this cogging unit, finishing mill or finishing mill group, the scale equipment, product cooling and collecting device, the cogging unit includes the first cutting cogging equipment of steel billet, carry and the plastic system, the second time cutting cogging equipment, carry and the plastic system, the nth time cutting cogging equipment. The utility model discloses compare with traditional rolling production line, this novel production line makes rolling production energy consumption reduce by a wide margin owing to do not use roughing mill group and rolling mill group, also makes rolling production line investment cost reduce by a wide margin simultaneously, therefore has good economic benefits and social.
Description
Technical Field
The utility model belongs to the technical field of metallurgical industry steel rolling technology and steel rolling, especially, relate to a novel steel rolling production line that adopts cutting type cogging.
Background
In the current steel rolling production technology, no matter continuous rolling production or semi-continuous rolling production is adopted, main production equipment adopted on a production line of the steel rolling production technology comprises heating equipment, a roughing mill or a roughing mill group, a middle mill group, a finishing mill group, cooling and collecting equipment and the like, a steel billet is heated by the heating equipment to reach the steel rolling temperature and sequentially enters the roughing mill group and the middle mill group, the sectional area of the steel billet is gradually reduced through pass rolling of the rolling mill group until the sectional area of the steel billet is reduced to meet the condition of entering the finishing mill group, then the steel billet enters the finishing mill group, a final steel product is formed through rolling of the finishing mill group, and then the steel billet enters the cooling and collecting equipment for cooling and product collection. The prior steel rolling technologies such as those mentioned in patent nos. 202010042179.2, 201911325629.2 and 201610011589.4 are conventional production forms using the above-mentioned steel rolling technologies. The disadvantages of this conventional production form are the large overall dimensions of the roughing mill train and the intermediate mill train, the heavy weight of the plant, the high energy consumption, the large installation capacity required, the large floor space and the large space occupied by the production line, the large construction investment in the rolling mill, the long construction period, and, in addition, the large spare part consumption and the high daily labor maintenance cost after the rolling mill production line is put into operation.
Therefore, if the small-section billet can be directly used for rolling the steel products only through the finishing mill group, on the one hand, the equipment investment is directly saved by more than 60%, the using area is saved by more than 50%, the electric energy consumption of the production line is reduced by more than 70%, and on the other hand, a large amount of equipment spare part consumption and manual maintenance cost are saved for the capacity of the same scale. However, the acquisition of small-section billets, in particular low-cost small-section billets, is a major difficulty faced by the current technology, and the production of small-section billets that can be directly finish rolled using a continuous casting machine is not feasible in the current environment due to the difficulties in technology, cost and safety, while the small-section billets can be easily obtained by cogging using a reciprocating cogging mill, but the higher production cost thereof is undoubtedly not competitive and is also not feasible.
Disclosure of Invention
The utility model aims at providing an adopt novel steel rolling production line of cutting formula cogging, through cutting formula cogging, cut into the small cross section steel billet with big section continuous casting steel billet, then, directly roll and produce the steel product through the small cross section steel billet that finish rolling group formed after the cutting to reach and reduce production line area on the one hand, reduce production line equipment investment by a wide margin, energy saving and consumption reduction, on the other hand reduces the purpose of production line spare part consumption and artifical maintenance cost.
The purpose of the utility model is realized by the following technical scheme:
the utility model discloses a novel steel rolling production line adopting cutting type cogging, which is characterized by comprising a steel billet heating device, a cogging unit connected with the steel billet heating device, an online heat preservation and temperature compensation system connected with the cogging unit, a finishing mill or a finishing mill group connected with the online heat preservation and temperature compensation system, a sizing device connected with the finishing mill or the finishing mill group, and a product cooling and collecting device connected with the sizing device,
the cogging unit comprises a first billet cutting and cogging device, a conveying and shaping system connected with the first billet cutting and cogging device, a second billet cutting and cogging device connected with the conveying and shaping system, a conveying and shaping system connected with the second billet cutting and cogging device, and an Nth billet cutting and cogging device connected with the conveying system,
the first cutting cogging device, the second cutting cogging device or the Nth cutting cogging device are all formed by a steel billet cutting cogging machine unit, the steel billet cutting cogging machine unit comprises a plurality of steel billet cutting cogging machines, each steel billet cutting cogging machine comprises a motor, a speed reducer connected with the motor, a cutter rotating shaft group connected with an output shaft of the speed reducer through a coupler, and a cutting cutter group arranged on the cutter rotating shaft group, wherein the cutter rotating shaft group is arranged in a frame of the steel billet cutting machine, and the motor is connected with an electrical control system.
The conveying and shaping system comprises a roller way conveying system and billet shaping equipment connected with the roller way conveying system after billet cutting and cogging.
The cutter rotating shaft group is an upper rotating shaft and a lower rotating shaft which are arranged in parallel, and the cutting cutter group is an upper cutting knife and a lower cutting knife which are respectively arranged on the upper rotating shaft and the lower rotating shaft.
The cutter rotating shaft group is a left rotating shaft and a right rotating shaft which are arranged in parallel, and the cutting cutter group is a left cutting knife and a right cutting knife which are respectively arranged on the left rotating shaft and the right rotating shaft.
The cutter rotating shaft group comprises an upper rotating shaft and a lower rotating shaft which are arranged in parallel, and a left rotating shaft and a right rotating shaft which are arranged in parallel, and the cutter rotating shaft group comprises an upper cutter and a lower cutter which are respectively arranged on the upper rotating shaft and the lower rotating shaft, and a left cutter and a right cutter which are respectively arranged on the left rotating shaft and the right rotating shaft.
The cutting tool bit of the cutting tool group is a roller type cutting tool bit, a circular sheet type cutting tool bit or a combination of the roller type cutting tool bit and the circular sheet type cutting tool bit, and the distance between every two cutting tool bits of the cutting tool group is adjustable or fixed.
The roller way conveying system mainly comprises a knockout roller way, a cutting front roller way, a cutting rear roller way and each section of conveying roller way which are sequentially arranged along the conveying direction.
The on-line heat preservation and temperature compensation system mainly comprises a heat preservation cover made of refractory heat preservation materials, an on-line induction heating device and a temperature detection device, wherein the on-line induction heating device is arranged among conveying roller ways of the roller way conveying system in an inserting mode.
The billet shaping equipment after cutting and cogging of the billet is mainly composed of a motor I, a speed reducer I, a transmission case, a machine body, a guide and a shaping roller.
The utility model has the advantages that:
the utility model discloses a novel steel rolling production line adopting cutting type cogging, which provides a metal rolling production line with energy-saving environmental protection and superior investment economy, and the production line cuts steel billets heated to the steel rolling temperature into small-section metal blanks through a steel billet mechanical cutting cogging device, thereby achieving the purpose of rolling steel products only by using a finishing mill group; because the production line does not need to be provided with a roughing mill group and a middle mill group of the traditional steel rolling production line and only uses a finishing mill group, the investment for rolling steel products is greatly reduced, and the production energy consumption is greatly reduced; adopt the utility model discloses a production line will reduce ton steel power consumption more than 60%, and production line area saves more than 50%, and the same-production-energy scale steel rolling production line investment descends more than 60%, therefore has obvious economic benefits and social.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the steel billet cutting type cogging mill of the present invention.
Fig. 3 is a schematic structural view of the cutting knife set of the utility model when the upper, lower, left and right directions of the cutting knife are set.
Fig. 4 is a schematic diagram of the cutting process of the steel billet of the present invention.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings.
As shown in fig. 1-4, the novel rolling production line using the cutting-type cogging of the present invention is characterized by comprising a billet heating device 1, a cogging unit connected to the billet heating device 1, an on-line heat-preserving and temperature-compensating system 6 connected to the cogging unit, a finishing mill or finishing mill group 7 connected to the on-line heat-preserving and temperature-compensating system 6, a sizing device 8 connected to the finishing mill or finishing mill group 7, a product cooling and collecting device 9 connected to the sizing device 8,
the cogging unit comprises a first billet cutting and cogging device 2, a conveying and shaping system connected with the first billet cutting and cogging device 2, a second billet cutting and cogging device 5 connected with the conveying and shaping system, a conveying and shaping system connected with the second billet cutting and cogging device 5, and an Nth billet cutting and cogging device connected with the conveying system,
the first cutting and cogging device 2, the second cutting and cogging device 5 or the Nth cutting and cogging device are all composed of a billet cutting type cogging machine set, the billet cutting type cogging machine set comprises a plurality of billet cutting type cogging machines, each billet cutting type cogging machine comprises a motor 10, a speed reducer 11 connected with the motor 10, a cutter rotating shaft set 15 connected with an output shaft of the speed reducer 11 through a coupler 12, and a cutting cutter set 13 arranged on the cutter rotating shaft set 15, the cutter rotating shaft set 15 is arranged in a billet cutting machine frame 14, and the motor 10 is connected with an electrical control system.
The conveying and shaping system comprises a roller way conveying system 3 and a billet shaping device 4 connected with the roller way conveying system 3 after billet cutting and cogging.
The cutter rotating shaft set 15 is an upper rotating shaft and a lower rotating shaft which are arranged in parallel, and the cutting cutter set 13 is an upper cutting knife 13-1 and a lower cutting knife 13-2 which are respectively arranged on the upper rotating shaft and the lower rotating shaft.
The cutter rotating shaft group 15 is a left rotating shaft and a right rotating shaft which are arranged in parallel, and the cutting cutter group 13 is a left cutting knife 13-3 and a right cutting knife 13-4 which are respectively arranged on the left rotating shaft and the right rotating shaft.
The cutter rotating shaft set 15 comprises an upper rotating shaft and a lower rotating shaft which are arranged in parallel, and a left rotating shaft and a right rotating shaft which are arranged in parallel, and the cutting cutter set 13 comprises an upper cutting knife 13-1 and a lower cutting knife 13-2 which are respectively arranged on the upper rotating shaft and the lower rotating shaft, and a left cutting knife 13-3 and a right cutting knife 13-4 which are respectively arranged on the left rotating shaft and the right rotating shaft.
The cutting knife heads of the cutting knife group 13 are roller type cutting knife heads, disc type cutting knife heads or a combination of the roller type cutting knife heads and the disc type cutting knife heads, and the distance between each cutting knife head of the cutting knife group 13 is adjustable or fixed.
The roller way conveying system 3 mainly comprises a knockout roller way, a cutting front roller way, a cutting rear roller way and each section of conveying roller way which are sequentially arranged along the conveying direction.
The on-line heat preservation and temperature compensation system 6 mainly comprises a heat preservation cover made of refractory heat preservation materials, an on-line induction heating device and a temperature detection device, wherein the on-line induction heating device is arranged among the conveying roller ways of the roller way conveying system 3 in an inserting mode.
The billet cutting and cogging back blank shaping equipment 4 mainly comprises a motor I, a speed reducer I, a transmission case, a machine body, a guide and shaping roller.
The utility model discloses an adopt novel steel rolling production line of cutting formula cogging, mainly by steel billet firing equipment 1, steel billet cutting cogging equipment, roll table conveying system 3, keep warm on line and temperature compensation system 6, steel billet cutting cogging back blank plastic equipment 4, finishing mill or finishing mill group 7, sizing apparatus 8, product cooling and collecting device 9 etc. all or part constitute.
The billet heating device 1 can be a billet caster hot delivery device, various heating furnaces or intermediate frequency induction heating devices capable of heating billets and the like which can heat the billets to the steel rolling temperature.
The billet cutting and cogging equipment consists of one or more billet cutting cogging machines, and each billet cutting cogging machine consists of a motor 10, a speed reducer 11, a cutter rotating shaft group 15 and a cutting cutter group 13. The form and number of the cutting heads can be changed according to the cutting requirements of specific steel billets, and a single roller type cutting head or a single circular sheet type cutting head can be used, and a cutting head group consisting of the cutting heads can also be used. The cutting head is processed into different sizes according to the requirements of cutting different blanks so as to meet the cutting requirements, and the cutting head is processed and manufactured by adopting different steel types or alloy materials according to the requirements of cutting hot-state steel billets. The billet cutting machine determines the pass of feed according to the size of a billet, the single feed depth of a cutting tool bit is generally not more than 40mm so as to avoid overlarge deformation of the billet, and continuous feed cutting in the depth direction is realized through a plurality of billet cutting machines or a plurality of passes of cutting head combination until the billet is longitudinally cut.
The billet cutting equipment can perform longitudinal cutting by feeding from the upper side, the lower side or the left side and the right side of the billet to be cut according to the specific requirements of the billet to be cut, so that the cut billet is divided into two halves along the longitudinal direction of the billet, and can also perform longitudinal cutting by feeding from the upper side, the lower side, the left side and the right side of the billet to be cut, so that the cut billet is divided into four strips along the longitudinal direction of the billet.
The roller way conveying system 3 mainly comprises a knockout roller way, a cutting front roller way, a cutting rear roller way, a parallel flow roller way and each section of conveying roller way which are sequentially arranged along the conveying direction.
The on-line heat preservation and temperature compensation system 6 mainly comprises a heat preservation cover made of a refractory heat preservation material, an on-line induction heating device and a temperature detection device, wherein the on-line induction heating device is arranged between the conveying roller ways of the roller way conveying system 3 in an inserting mode and used for carrying out temperature compensation on the small-section billet which is sent into the finishing mill or the finishing mill group 7 and is subjected to cutting cogging, so that the temperature of the small-section billet meets the condition of finish rolling, and the temperature detection device carries out temperature detection on the inlet end and the outlet end of the on-line induction heating device.
The billet cutting and cogging billet shaping device 4 is used for shaping the cut billet into a geometric shape with an accurate size so as to reduce the sectional area of the billet for secondary cutting. The billet shaping equipment 4 after cutting and cogging of the billet mainly comprises a motor I, a speed reducer I, a transmission case, a machine body, a guide and a shaping roller. The working process is that the billet subjected to cutting and cogging is guided into a shaping device, the surface of a device roller is provided with a hole pattern, the hole pattern design meets the cutting requirement of the concrete billet, and the section shape required by a producer can be obtained after the intermediate metal billet passes through the shaping device.
The finishing mill or finishing mill group 7 is an equipment group consisting of various types of finishing mills which are mature and used in steel rolling production lines at home and abroad at present.
The sizing device 8 is a saw or a shear in various forms widely applied to the current steel rolling production line, can be portal or cantilever type, and can also adopt a flying shear to size, so that the intermediate blank or the product meets the length dimension standard of the product.
The product cooling and collecting device 9 is used for cooling, collecting and packaging the hot product, and can be a cooling bed, a PF line, a collecting rack, a collecting tank or other known off-line cooling and collecting devices and the like according to the requirements of producing steel products.
The utility model discloses an adopt novel steel rolling production line of cutting formula cogging can be used for producing steel products such as round steel, screw-thread steel, square steel, band steel, ribbon steel, flat-bulb steel, various shaped steel.
The utility model provides a metal rolling production line with energy-concerving and environment-protective nature and superior investment economy, this production line will pass through steel billet machinery cutting cogging equipment heating to the steel rolling temperature, cuts into small cross-section metal blank to reach and only use finishing mill group to carry out the rolling purpose of steel product. Because the utility model discloses the production line need not dispose traditional rolling production line's roughing mill group and medium rolling mill group, only uses the finishing mill group, therefore greatly reduced for the investment that rolled steel product goes on to make the production energy consumption reduce by a wide margin. Adopt the utility model discloses a production line will reduce ton steel power consumption more than 60%, and production line area saves more than 50%, and the same-production-energy scale steel rolling production line investment descends more than 60%, therefore has obvious economic benefits and social.
Example (b): novel deformed steel bar production line using cutting type cogging
A deformed steel bar production line using cutting type cogging mainly comprises a billet heating device 1, a first billet cutting and cogging device 2, a roller bed conveying system 3, a billet shaping device 4 after billet cutting and cogging, a second billet cutting and cogging device 5, an online heat preservation and temperature compensation system 6, a finishing mill or finishing mill group 7, a sizing device 8, a product cooling and collecting device 9 and the like.
The raw material billet adopts a 150mm multiplied by 150mm specification continuous casting billet with a fixed length of 3 m.
The billet heating equipment 1 adopts a 30th steel pushing type heating furnace, natural gas is used as fuel, and the average tapping temperature of the billet is 1150 ℃.
The first billet cutting and cogging equipment 2 consists of two groups of billet cutting cogging machine units, the first cutting unit 2-1 consists of 8 billet cutting cogging machines with upper and lower cutting heads, the upper and lower cutting depths of each of the front 7 billet cutting cogging machines are respectively 10mm, and the total cutting depth of the last billet cutting cogging machine is 10 mm. The first second cutting machine set 2-2 is a billet cutting type cogging mill set composed of 3 billet cutting type cogging mills with upper and lower cutting heads, the upper and lower cutting depths of each frame of the front 2 billet cutting type cogging mills are respectively 15mm, and the total cutting depth of the 3 rd billet cutting type cogging mill is 10 mm. The billet is cut into two billets of 70mm multiplied by 150mm multiplied by 3300mm after passing through the first cutting unit 2-1 for the first time. Under the pushing of the roller way, two steel billets sequentially enter a first second cutting unit 2-2 through a limiting guide, and each billet cut for the second time is cut into two billets of 70mm multiplied by 3450 mm.
The cutting speed of the first cutting and cogging device 2 of the steel billet is 0.3 m/s.
Further, 70mm blanks obtained after the first cogging are pushed by a roller way to sequentially enter the billet cutting and cogging rear blank shaping equipment 4, the billet cutting and cogging rear blank shaping equipment 4 is a rack hole type shaping equipment, and the surfaces of the cut 70mm section blanks become flat after passing through the shaping equipment.
Further, the shaped billet is pushed into a billet secondary cutting and cogging device 5 through a roller way, the billet secondary cutting and cogging device 5 consists of two groups of billet cutting cogging machine units, the second primary cutting unit 5-1 consists of 4 billet cutting cogging machine units with upper and lower cutting heads, the upper and lower cutting depths of each rack of the front 3 billet cutting cogging machines are respectively 10mm, and the total cutting depth of the last billet cutting cogging machine is 10 mm. The second cutting machine set 5-2 is a billet cutting type cogging mill set consisting of 2 billet cutting type cogging mills with upper and lower cutting heads, the upper and lower cutting depths of each rack of the former billet cutting type cogging mill are respectively 10mm, and the total cutting depth of the second billet cutting type cogging mill is 10 mm. The billet is cut into two billets of 32mm × 70mm × 3700mm after passing through the second first cutting unit 5-1. Under the pushing of the roller way, two steel billets sequentially enter a second cutting unit 5-2 through a limiting guide, and each billet cut for the second time is cut into two billets of 32mm multiplied by 4000 mm.
Further, the 32mm x 32mm billet is pushed into the on-line heat preservation and temperature compensation system 6 through the roller way, the heat preservation cover is combined with the temperature compensation system, the heat loss is reduced by the protective cover, the energy utilization efficiency is improved, and the temperature compensation system ensures that the billet is in the temperature range of 800 plus 950 ℃ for rolling when the billet enters the finishing mill or the finishing mill group 7. The temperature compensation system is used for providing temperature compensation by the online induction heating device, and the working state and the standby state are switched according to the real-time temperature measurement result of the set temperature detection device.
Further, the 32mm x 32mm steel billet in the rolling temperature interval is conveyed to a finishing mill group through a roller way, the finishing mill group consists of 12 finishing mills, and the steel billet is rolled by 12 passes to obtain a threaded steel bar with the diameter of 8 mm.
Further, the deformed steel bar straight bar with the diameter of 8mm is cut to the length of 12m by the sizing equipment 8, and then is conveyed to the cooling bed and the collecting equipment by the roller way to finish the cooling and packaging of the product, and the production process of the whole product is finished.
The utility model discloses an adopt novel steel rolling production line of cutting formula cogging to be used for rolling all kinds of steel products, the steel billet that will heat to the steel rolling temperature carries out single pass or multiple pass cutting cogging through the steel billet machinery cutting equipment of special design, and cogging will cut into the small cross section blank with big cross section blank through single or cutting many times, and the small cross section blank after the group of the finishing mill of reusing carries out the rolling of product production and forms final steel product. Compared with the traditional steel rolling production line, the utility model discloses the production line makes steel rolling production energy consumption reduce by a wide margin owing to do not use roughing mill group and rolling mill group, also makes steel rolling production line investment cost reduce by a wide margin simultaneously, therefore has good economic benefits and social.
The above description is only for the purpose of illustrating specific embodiments of the present invention and is not intended to limit the scope of the present invention, which is defined by the appended claims, and all equivalents thereof that come within the meaning and range of equivalents of the claims, either direct or indirect use within the scope of the invention as defined by the claims, or both.
Claims (9)
1. A novel steel rolling production line adopting cutting type cogging is characterized by comprising a steel billet heating device, a cogging unit connected with the steel billet heating device, an online heat preservation and temperature compensation system connected with the cogging unit, a finishing mill or a finishing mill unit connected with the online heat preservation and temperature compensation system, a sizing device connected with the finishing mill or the finishing mill unit, and a product cooling and collecting device connected with the sizing device,
the cogging unit comprises a first billet cutting and cogging device, a conveying and shaping system connected with the first billet cutting and cogging device, a second billet cutting and cogging device connected with the conveying and shaping system, a conveying and shaping system connected with the second billet cutting and cogging device, and an Nth billet cutting and cogging device connected with the conveying system,
the first cutting cogging device, the second cutting cogging device or the Nth cutting cogging device are all formed by a steel billet cutting cogging machine unit, the steel billet cutting cogging machine unit comprises a plurality of steel billet cutting cogging machines, each steel billet cutting cogging machine comprises a motor, a speed reducer connected with the motor, a cutter rotating shaft group connected with an output shaft of the speed reducer through a coupler, and a cutting cutter group arranged on the cutter rotating shaft group, wherein the cutter rotating shaft group is arranged in a frame of the steel billet cutting machine, and the motor is connected with an electrical control system.
2. The new type of steel rolling production line with the cutting and cogging as claimed in claim 1, characterized in that said conveying and shaping system includes a roller conveyor system, and a billet cutting and cogging billet shaping device connected to said roller conveyor system.
3. The novel steel rolling production line using the cut-off cogging according to claim 1, wherein said cutter rotation shaft groups are an upper rotation shaft and a lower rotation shaft arranged in parallel, and said cutter groups are an upper cutter and a lower cutter respectively arranged on said upper rotation shaft and said lower rotation shaft.
4. The novel steel rolling production line adopting the cogging according to claim 1, wherein the cutter rotating shaft groups are a left rotating shaft and a right rotating shaft which are arranged in parallel, and the cutting cutter groups are a left cutting knife and a right cutting knife which are respectively arranged on the left rotating shaft and the right rotating shaft.
5. The novel steel rolling production line using the cogging according to claim 1, wherein said tool rotation shaft set includes an upper rotation shaft and a lower rotation shaft which are arranged in parallel, and a left rotation shaft and a right rotation shaft which are arranged in parallel, and said cutting tool set includes an upper cutting blade and a lower cutting blade which are respectively arranged on said upper rotation shaft and said lower rotation shaft, and a left cutting blade and a right cutting blade which are respectively arranged on said left rotation shaft and said right rotation shaft.
6. The novel steel rolling production line adopting the slit type cogging according to claim 1, wherein the cutting bits of the cutting bit group are roll type cutting bits, wafer type cutting bits or a combination of the roll type cutting bits and the wafer type cutting bits, and the interval between each cutting bit of the cutting bit group is adjustable interval or fixed interval.
7. A novel steel rolling production line adopting the cutting cogging according to claim 2, characterized in that the roller way conveying system mainly comprises a cogging roller way, a cutting front roller way, a cutting rear roller way and each section of conveying roller way which are sequentially arranged along the conveying direction.
8. A novel steel rolling production line adopting the slit type cogging as claimed in claim 2, wherein said on-line heat-insulating and temperature-compensating system is mainly composed of a heat-insulating cover made of refractory heat-insulating material, an on-line induction heating device and a temperature detecting device, and said on-line induction heating device is inserted between the roller ways of said roller way conveying system.
9. The novel steel rolling production line adopting the cutting cogging as claimed in claim 1, wherein the billet shaping device after the billet cutting cogging mainly comprises a motor I, a speed reducer I, a transmission case, a machine body, a guide and a shaping roller.
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