CN111036711A - Multi-roll-pitch high-rigidity high-load steel plate straightening machine - Google Patents

Multi-roll-pitch high-rigidity high-load steel plate straightening machine Download PDF

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Publication number
CN111036711A
CN111036711A CN201911221863.0A CN201911221863A CN111036711A CN 111036711 A CN111036711 A CN 111036711A CN 201911221863 A CN201911221863 A CN 201911221863A CN 111036711 A CN111036711 A CN 111036711A
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China
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roll
roller
frame
straightening
bearing
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CN201911221863.0A
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CN111036711B (en
Inventor
马晓明
唐超
李松
王焜盟
刘万里
王建
刘冰
许威清
景永亮
贾国龙
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Beijing Ablyy Technology Development Co ltd
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Beijing Ablyy Technology Development Co ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/02Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B30PRESSES
    • B30BPRESSES IN GENERAL
    • B30B15/00Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/04Frames; Guides
    • B30B15/042Prestressed frames

Abstract

The invention discloses a multi-roll-pitch high-rigidity high-load steel plate straightening machine which comprises a prestress interlocking frame, wherein the prestress interlocking frame comprises a lower base frame arranged on the ground, two upper cross beams are connected above the lower base frame through four vertically-arranged hollow upright posts, interlocking mechanisms are respectively arranged between the lower base frame and the hollow upright posts as well as between the upper cross beams and the hollow upright posts, and tensioning prestress mechanisms are arranged in the hollow upright posts; the lower base frame is connected with a lower roll system device which is horizontally arranged, and the upper cross beam is connected with an upper roll system device which is opposite to the lower roll system device. The invention is applied to the field of medium plate straightening, has the characteristics of high-rigidity interlocking frames, side roller load adjustment, online roll gap adjustment, compact structure, quick response, high-speed roll change of a multi-roll system and the like, can realize reciprocating straightening, has good straightening plate shape, and can particularly meet the straightening flatness requirement of high-strength steel plates with extremely large thickness ranges.

Description

Multi-roll-pitch high-rigidity high-load steel plate straightening machine
Technical Field
The invention belongs to the field of mechanical equipment, and further relates to metal profile cold treatment mechanical equipment, in particular to a multi-roll-pitch high-rigidity high-load steel plate straightening machine.
Background
The straightening machine is one of main finishing equipment on a medium plate production line and is used for straightening a steel plate so that the straightness of the steel plate meets the requirements of national standards and customers. In order to improve the shape of the plate and the quality of the product, the modern straightening machine adopts various technologies and means.
In the production process of the straightening machine, the yield strength of the straightening steel is continuously increased along with the continuous increase of the thickness of the straightening steel plate, and the required straightening force is improved in a geometric series manner; all straightening forces of the straightener are borne by the roll system and are finally transmitted to the stand. The existing straightening machine frame mainly has two types, one type is a cast steel memorial archway, the elastic deformation amount is large in the straightening process, the quality of a straightened steel plate can be directly influenced, and the other type adopts a combined welding type structure that an upper cross beam, a base and a vertical column are combined together through four pre-tightening screw rods and eight locking nuts. The rigidity of the frame is insufficient, the arrangement of the support rollers of the existing straightening machine roller system has no effective utilization space, the row number of the support rollers is limited, the bearing capacity of the whole roller system is insufficient, and the support rollers can not be adjusted independently for the row adjustment.
The steel plate specification and thickness range produced by medium plate is very wide, the strength of the steel plate to be straightened is also very high, the straightening range of the straightening machine at present is difficult to meet the requirements at the same time, in order to more flexibly set various forms of straightening roll gaps to adapt to the steel plate specification in a wide range, German SMS-SIEMAG company has recently proposed a nine-five roll variable-roll number cold straightening machine, the same set of roll system can limitedly improve the straightening range of the thick steel plate by changing into nine rolls or five rolls to participate in the work, and the cold straightening machine which is newly produced in a small number of families such as 5m at the Yingkou, 5m at Bao and the like in China at present adopts the structure. However, in the process of changing the number of rollers, the distance between adjacent rollers of the currently used straightening machine cannot be increased, the bearing capacity of a single roller cannot be improved, and the range of straightening steel plates is still greatly limited. When a multi-roll straightener straightens a thick steel plate, straightening can be performed by reducing the number of the straightening rolls participating in working, but when the number of the straightening rolls is reduced, the conditions of uneven roll intervals, limited bearing capacity of a single roll and the like can occur, so that the bending degree of the steel plate needs to be reduced when the thick plate is straightened, the bending moment is insufficient when the thick plate is straightened, the bearing of a single straightening roll is too high, the steel plate is easy to damage, and the range of the straightening thick plate is limited to a large extent; at present, when a part of manufacturers applying the straightening machine with the structure type straightens the thick plate, the straightness of the thick plate can be slightly improved only by reducing the bending amount of the steel plate and increasing straightening passes. For a straightening machine with large specification change of a straightening steel plate, Chinese patent CN01128973.2 discloses a plate and strip variable roll pitch straightening machine, which proposes a concept of variable roll pitch, but the patent only stays at a theoretical stage and does not propose a variable roll pitch structure which can be practically used.
Chinese patent CN2309192Y discloses a hot straightening machine for medium plate, wherein the clamping device between the upper roller system and the upper stress frame is a hydraulic spring clamping device, the device is composed of an oil cylinder, a handle, a spring and a T-shaped bolt, one end of the T-shaped bolt is connected with a piston, the bolt and the piston can move axially, the bolt can move rotationally relative to the piston, the other end is connected with the upper roller seat frame, and the handle is fixedly connected with the bolt. However, the mechanism is too complicated, the spring is easy to lose efficacy, and the upper roll seat frame and the upper cross beam cannot be smoothly loosened, so that the roll changing time is prolonged.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a multi-roll-pitch high-rigidity high-load steel plate straightener, which has the following specific scheme:
the device comprises a prestress interlocking frame, wherein the prestress interlocking frame comprises a lower base frame arranged on the ground, two upper cross beams are connected above the lower base frame through four vertically arranged hollow upright posts, interlocking mechanisms are arranged between the lower base frame and the hollow upright posts and between the upper cross beams and the hollow upright posts, and tensioning prestress mechanisms are arranged in the hollow upright posts; the lower base frame is connected with a lower roll system device which is horizontally arranged, the top surface of the lower roll system device is provided with a plurality of lower straightening rolls, the upper cross beam is connected with an upper roll system device which is opposite to the lower roll system device, and the bottom surface of the upper roll system device is provided with a plurality of upper straightening rolls; the gap between the lower straightening roll and the upper straightening roll forms a working cavity for the steel plate to be straightened to pass through, and the lower straightening roll and the upper straightening roll are both connected with a power machine through a universal coupling and a speed reducer in a transmission way.
Furthermore, the tensioning prestress mechanism comprises a pull rod arranged in the hollow upright post, a lower connecting post matched with the hollow upright post is formed on the lower base frame, the lower end of the pull rod penetrates out of the lower connecting post and is connected with the lower base frame through a lower nut, an upper connecting post matched with the hollow upright post is formed on the upper cross beam, and the upper end of the pull rod penetrates out of the upper connecting post and is connected with the upper cross beam through an upper nut.
Furthermore, the interlocking mechanism comprises a vertically arranged body, two ends of the body are bent ninety degrees towards the same side to form two buckling blocks, and the two buckling blocks are respectively connected to the end part of the hollow upright post and the end part of the upper connecting post or the lower connecting post; the inner side surface of one of the buckling blocks is formed into an inclined surface, the inclined surface is provided with a wedge pressing block matched with the inclined surface, and the body is provided with a plurality of adjusting screws with tail ends abutting against the wedge pressing block in a penetrating manner.
Furthermore, the upper roll system device comprises an upper stress frame and an upper roll box assembly connected below the upper stress frame, and the upper stress frame is arranged among the plurality of hollow upright columns and connected with the power equipment; the side wall of the upper stress frame is provided with a plurality of clamping cylinder supports, and vertical clamping cylinders are fixedly connected to the clamping cylinder supports; a fixing plate opposite to the clamping cylinder support is arranged on the side wall of the upper roll box assembly, and a clamping groove matched with the output rod of the clamping cylinder is formed in the fixing plate;
the slider is located on the lateral wall of going up the atress frame, the both sides of going up the atress frame correspond be equipped with pneumatic cylinder holding chamber under the entablature, pneumatic cylinder holding intracavity is equipped with the pneumatic cylinder, power equipment's output stretches into pneumatic cylinder holding chamber and with the input of pneumatic cylinder is connected.
Furthermore, the upper roll box assembly comprises an upper roll box frame, a plurality of upper bearing seats which are uniformly spaced and vertical to the upper cross beam are arranged on the bottom surface of the upper roll box frame, an upper supporting roll accommodating cavity is formed between every two adjacent upper bearing seats, and an upper supporting roll which is horizontal and vertical to the upper cross beam is arranged in each upper supporting roll accommodating cavity;
the positions, corresponding to the two ends of the upper supporting roller accommodating cavity, on the side surface of the upper roller box frame are connected with guide shaft sleeves which are vertically arranged through hexagon nuts, disc springs are sleeved outside the guide shaft sleeves, and gaskets are sleeved outside the guide shaft sleeves and positioned at the lower ends of the disc springs; an upper connecting rod penetrates through the guide shaft sleeve, the bottom of the upper connecting rod is connected with an upper working roll bearing seat, and two ends of the upper straightening roll penetrate through the upper working roll bearing seat and are in contact with the upper supporting roll.
Further, the clamping cylinder comprises a clamping cylinder body, a first piston and a second piston are arranged in the clamping cylinder body, the first piston is connected with a T-shaped head piston rod extending out of the clamping cylinder body, a telescopic shaft is connected between the first piston and the second piston, the second piston is connected with a rotating shaft extending out of the clamping cylinder body, and the T-shaped head piston rod and the rotating shaft extending out of the clamping cylinder body are both subjected to sealing treatment; a rotating cylinder is sleeved outside the part of the rotating shaft, which is positioned in the clamping cylinder body, a spiral rotating groove is formed in the outer wall of the rotating cylinder, the projection of the rotating groove in the axial direction of the rotating cylinder is a quarter circular arc, and a guide piece matched with the rotating groove is connected to the inner wall of the clamping cylinder body through a fixed rod;
the telescopic shaft comprises a sleeve and a shaft rod which are sleeved, one end of the sleeve is fixedly connected to the first piston, one end of the shaft rod is fixedly connected to the second piston, a plurality of axially-arranged transmission grooves are formed in the inner wall of the sleeve, and a plurality of transmission convex strips matched with the transmission grooves are formed in the outer wall of the shaft rod.
Furthermore, the lower roll system device comprises a lower roll box frame connected to the lower base frame, a plurality of lower bearing blocks which are uniformly spaced and vertical to the upper cross beam are arranged on the top surface of the lower roll box frame, a lower supporting roll accommodating cavity is formed between every two adjacent lower bearing blocks, and a lower supporting roll which is horizontally arranged and vertical to the upper cross beam is arranged in each lower supporting roll accommodating cavity; the side surface of the lower roll box frame is provided with lower connecting rods which are vertically arranged at positions corresponding to two ends of the lower supporting roll accommodating cavity, the top of each lower connecting rod is connected with a lower working roll bearing seat, two ends of each lower straightening roll are connected onto the lower working roll bearing seats through bearings and are parallel to and contacted with the lower supporting roll, and each lower straightening roll is arranged corresponding to a gap between the upper straightening rolls;
a plurality of side roller bearing seats which are uniformly spaced and vertical to the upper cross beam are arranged on the top surface of the lower roll box frame corresponding to the inlet and the outlet of the working cavity, a side roller supporting roll accommodating cavity is formed between every two adjacent side roller bearing seats, and each side roller supporting roll accommodating cavity is internally provided with a side roller supporting roll which is horizontally arranged and parallel to the lower supporting roll; correspond on the lower roll box frame side the position at limit roller backing roll holding chamber both ends is equipped with the limit roller connecting rod of vertical arrangement, the top of limit roller connecting rod is connected with the limit roller bearing frame, wear to be equipped with through the bearing between the limit roller bearing frame with the parallel and limit roller that contacts of limit roller backing roll, the limit roller with the relative height of straightening roll can be adjusted down.
Further, the upper supporting roller and the lower supporting roller comprise supporting roller bodies, aligning roller bearings and mandrels, the supporting roller bodies are formed into high-strength hollow roller rings, transition fitting curved surfaces with certain widths are arranged at two ends of the outer circular surface of each supporting roller body, the aligning roller bearings are installed on the inner wall of each supporting roller body, the mandrels penetrate through bearing holes of the aligning roller bearings, and two ends of the mandrels are mutually meshed and fixed in the upper bearing seat or the lower bearing seat.
Furthermore, an adjusting cavity is arranged on the lower base frame and corresponds to the position right below the side roller supporting roller, a side roller load adjusting mechanism is arranged in the adjusting cavity and comprises a plurality of jacks which are arranged in the adjusting cavity and are positioned right below the side roller bearing seat, and the top of the output end of each jack is connected to the bottom surface of the side roller bearing seat; the input ends of the jacks are sequentially connected through a tooth coupling and a transmission shaft, and the input end of one jack positioned at the most lateral side is connected with a hydraulic motor through the tooth coupling and the transmission shaft;
the top surface of the adjusting cavity is also provided with a plurality of vertically arranged lifting cylinders in a penetrating manner, the upper ends of output rods of the lifting cylinders are connected with lifting shafts vertical to the lower supporting rollers, and the lower bearing seats are connected to the lifting shafts.
Furthermore, a power device is connected between the upper cross beam and the upper roll system device, side sliding plates are arranged on opposite side surfaces of the two hollow upright posts below the same upper cross beam, the upper roll system device is connected to the side sliding plates through sliding blocks, and the upper roll system device can move in the vertical direction under the action of the power device and the side sliding plates.
The multi-roll-pitch high-rigidity high-load steel plate straightener provided by the invention has the beneficial effects that:
1. the machine frame adopts a split structure and is connected by the interlocking mechanism, so that the gap generated by the straightening force acting between the machine frames is eliminated, the whole machine frame is of a rigid integral structure, all the split structures of the machine frame are ensured to bear the straightening force all the time during straightening, the dynamic rigidity of the machine frame is improved, and the straightening capability of the equipment can be greatly improved;
2. the roller system is provided with supporting rollers which are arranged in an ultrahigh and dense mode and are mutually meshed, the supporting rollers are of a combined structure and comprise a supporting roller body, a self-aligning roller bearing, a roller shaft and the like, the supporting rollers are of a high-strength hollow roller ring structure, and the supporting roller bearings are arranged in the roller ring; the density of the supporting roll is greatly improved, and the contact rate of the supporting roll and the roll surface of the straightening roll is improved; the straightening roller system has the advantages of compact structure, strong bearing capacity, lower cost and the like, the number of rows of supporting rollers for supporting a single straightening roller is increased, and the bearing capacity of the straightening roller system is improved by multiple times;
3. the hydraulic locking mechanism with the rapid self-rotating stretching function has the advantages that all actions are completed by the hydraulic system, the hydraulic locking mechanism can rapidly clamp and release the upper roll system, the operation is simple, reliable and convenient, and the time is saved for rapid roll changing.
Drawings
Figure 1 is a perspective view of the present invention,
figure 2 is a front view of the present invention,
figure 3 is a top view of the present invention,
figure 4 is a side view of the present invention,
figure 5 is a schematic structural view of the tightening prestressing mechanism of the present invention,
figure 6 is a front view of the interlock mechanism of the present invention,
figure 7 is a perspective view of an interlock mechanism of the present invention,
figure 8 is a schematic view of the connection of the upper force frame and upper roller box assembly of the present invention,
figure 9 is a perspective view of the power plant of the present invention,
figure 10 is a top view of the power plant of the invention,
figure 11 is a perspective view of the upper force frame of the present invention,
figure 12 is a perspective view of the upper roller box assembly of the present invention,
figure 13 is a front view of the upper roller box assembly of the present invention,
figure 14 is a side view of the upper roller box assembly of the present invention,
figure 15 is a schematic view showing the internal structure of the chucking cylinder of the present invention,
figure 16 is a schematic view (in axial view) of the construction of a telescopic shaft according to the invention,
figure 17 is a perspective view of the lower roll cassette frame of the present invention with the lower straightening rolls installed,
figure 18 is a side view of the lower roll cassette frame of the present invention with the lower straightening rolls installed,
figure 19 is a perspective view of the lower roll cassette frame of the present invention with the lower straightening rolls and edge rolls installed,
figure 20 is a side view of the lower roll cassette frame of the present invention with the lower straightening rolls and edge rolls installed,
figure 21 is a schematic view of the structure of the lower base frame of the present invention,
fig. 22 is a schematic view of the construction of the lower support roller of the present invention.
Figure number and name: 1. a lower base frame 101, a lower connecting column 102, a lower nut 103, an adjusting cavity 104, a side roller load adjusting mechanism 105, a jack 106, a hydraulic motor 107, a lifting cylinder 108, a lifting shaft 2, a hollow upright column 201, a side sliding plate 202, a sliding block 3, an upper cross beam 301, an upper connecting column 302, an upper nut 303, a worm and gear accommodating cavity 304, a pressing screw 305, a worm gear 306, a fixed platform 307, a double-shaft motor 308, a worm 309, a balance cylinder support base 310, a balance cylinder 311, an intermediate shaft 312, a clutch 4, an interlocking mechanism 401, a body 402, a buckling block 403, a wedge pressing block 404, an adjusting screw 5, a tensioning prestressing mechanism 501, a pull rod 6, a lower roller system device 601, a lower straightening roller 602, a lower roller box frame 603, a lower bearing seat 604, a lower supporting roller accommodating cavity 605, a lower supporting roller, 606. a lower connecting rod 607, a lower work roll chock, 608, an edge roll backup roll chock, 609, an edge roll backup roll receiving chamber, 610, an edge roll backup roll, 611, an edge roll connecting rod, 612, an edge roll chock, 613, an edge roll, 614, a support roll body, 615, a self-aligning roll bearing, 616, a mandrel, 617, a cover shaft, 618, an inter-roll cover plate, 7, an upper roll system device, 701, an upper straightening roll, 702, an upper stress bracket, 703, an upper roll cassette assembly, 704, a clamping cylinder holder, 705, a clamping cylinder, 707, a fixing plate, 708, a clamping groove, 709, a hydraulic cylinder receiving chamber, 710, a hydraulic cylinder, 711, an upper roll cassette frame, 712, an upper bearing seat, 713, an upper support roll receiving chamber, 714, an upper support roll, 715, a guide sleeve, 716, a disc spring, 717, a washer, 718, an upper connecting rod, 719, an upper work roll chock, a clamping cylinder, 722, a first piston, 723, a second piston, 724. a T-shaped head piston rod 725, a telescopic shaft 726, a rotating shaft 727, a rotating cylinder 728, a rotating groove 729, a fixed rod 730, a guiding element 731, a shaft sleeve 732, a shaft rod 733, a transmission groove 734, a transmission convex strip,
Detailed Description
To explain the technical content, structural features, attained objects and effects of the present invention in detail, embodiments are described below in detail with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, are used only for convenience in describing the present invention and for simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the scope of the present invention.
With reference to fig. 1-4, the multi-roll-pitch high-rigidity high-load steel plate straightener disclosed by the invention comprises a prestress interlocking frame, wherein the prestress interlocking frame comprises a lower base frame 1 arranged on the ground, two upper cross beams 3 are connected above the lower base frame 1 through four vertically arranged hollow upright posts 2, interlocking mechanisms 4 are respectively arranged between the lower base frame 1 and the hollow upright posts 2 and between the upper cross beams 3 and the hollow upright posts 2, and tensioning prestress mechanisms 5 are arranged in the hollow upright posts 2; the lower base frame 1 is connected with a lower roll system device 6 which is horizontally arranged, the top surface of the lower roll system device 6 is provided with a plurality of lower straightening rolls 601, the upper cross beam 3 is connected with an upper roll system device 7 which is opposite to the lower roll system device 6, and the bottom surface of the upper roll system device 7 is provided with a plurality of upper straightening rolls 701; the gap between the lower straightening roll 601 and the upper straightening roll 701 forms a working cavity for the steel plate to be straightened to pass through, and the lower straightening roll 601 and the upper straightening roll 701 are both in transmission connection with a power machine (not shown in the attached drawings) through a universal coupling and a speed reducer.
As shown in fig. 5, the tensioning prestressing mechanism 5 comprises a pull rod 501 arranged in the hollow upright post 2, a lower connecting post 101 matched with the hollow upright post 2 is formed on the lower base frame 1, the lower end of the pull rod 501 penetrates out of the lower connecting post 101 and is connected with the lower base frame 1 through a lower nut 102, an upper connecting post 301 matched with the hollow upright post 2 is formed on the upper cross beam 3, and the upper end of the pull rod 501 penetrates out of the upper connecting post 301 and is connected with the upper cross beam 3 through an upper nut 302;
the two ends of the hollow upright column 2, the bottom end of the upper connecting column 301 and the top end of the lower connecting column 101 are all folded outwards to form horizontal connecting plates, as shown in fig. 6 and 7, the interlocking mechanism 4 comprises a vertically arranged body 401, the two ends of the body 401 are bent ninety degrees towards the same side to form two buckling blocks 402, and the two buckling blocks 402 are respectively connected to the connecting plates at the two ends of the hollow upright column 2 and the connecting plates at the end parts of the upper connecting column 301 or the lower connecting column 101; the inner side surface of one of the buckling blocks 402 is formed into an inclined surface, the inclined surface is provided with a wedge pressing block 403 matched with the inclined surface, and two adjusting screws 404 with tail ends abutting against the wedge pressing block 403 penetrate through the body 401. The interlocking mechanism 4 and the tensioning prestress mechanism 5 are matched to ensure that the prestress interlocking frame can ensure enough rigidity on the premise of a split structure so as to keep enough overall stability in the working process.
In the conventional straightener, in order to have enough pressure (usually, the maximum pressure marked on the press is 2000-3000 tons), the upper beam and the base are connected through a plurality of pull rods, the pull rods are pre-tensioned through nuts positioned above the upper beam and below the base, and the columns only have the functions of bearing the pressure generated when the nuts are tightened and supporting the initial weight of each component of the upper beam. When the hydraulic cylinder works, the distance between the upper cross beam and the ground frame is fixed under the action of the pull rod, so that the straightening roller on the bottom surface of the upper cross beam generates larger pressure to straighten the plate; however, because the pull rod bears limited pulling force (the existing pull rod can generate 1mm deformation when being subjected to 300 tons of force), when the pull rod is elongated due to the fact that the pulling force borne by the pull rod exceeds the limit, the distance between the upper cross beam and the base frame can be increased along with the extension of the pull rod because the upright column cannot bear the pulling force load; at this time, no matter how much pressure is provided by the hydraulic cylinder, the hydraulic cylinder only can be converted into the deformation of the pull rod, so that the upper limit of the pressure of the straightening machine cannot reach the maximum pressure (generally, the pressure can only reach 600 tons to 1000 tons).
And the prestressing force interlocking frame of this application, the structure of redesign pull rod and stand for the both ends of stand are connected and are locked with entablature and base frame respectively (can pass through outside locking through the lock piece as above-mentioned, also can pass through the stand tip, the self-locking structure that the entablature was mutually supported with the base frame shaping, make the stand can not only bear the load of pressure direction also can bear the load of pulling force direction, thereby guarantee hydraulic system at the during operation, the counter force of straightening roller to public piece production huge pressure is loaded jointly by pull rod and stand. Through tests, the bearing capacity of a single upright column is improved to more than 1000 tons from the traditional 300 tons, and the straightening machine can reach higher pressure on the premise of not changing the installation quantity of the upright columns of the traditional straightening machine.
With reference to fig. 8-10, a worm and gear accommodating cavity 303 is formed in the top of the upper cross beam 3, a vertical screw 304 is disposed in the worm and gear accommodating cavity 303, the lower end of the screw 304 penetrates through the upper cross beam 3 to be connected with the upper roller system device 7, and a worm wheel 305 which is located in the worm and gear accommodating cavity 303 and is horizontally arranged is sleeved on the upper end of the screw 304; a fixed platform 306 is arranged between the two upper cross beams 3, a double-shaft motor 307 vertical to the upper cross beams 3 is arranged on the fixed platform 306, and two output shafts of the double-shaft motor 307 are connected with a worm 308 matched with a worm wheel 305 through a coupler;
a balance cylinder support 309 is arranged on one side of the worm gear accommodating cavity 303 relative to the double-shaft motor 307, a balance cylinder 310 is hinged on the balance cylinder support 309, and the tail end of an output rod of the balance cylinder 310 is hinged with the upper roller system device 7. One output shaft of the double-shaft motor 307 is connected with an intermediate shaft 311 through a coupler, the intermediate shaft 311 is connected to the top surface of the fixed platform 306 through a bearing seat, and the tail end of the intermediate shaft 311 is connected with the worm 308 through a clutch 312. When the opening degree of the straightener is calibrated, the upper position and the lower position of the straightener are not consistent when the four worms are installed, the straightener needs to be independently adjusted to a uniform position, the clutch is disengaged at the moment, and the four points are independently adjusted, so that the calibration can be more accurate.
Referring to fig. 11 to 14, the upper roller system 7 includes an upper stress frame 702 and an upper roller box assembly 703 connected below the upper stress frame 702, the upper stress frame 702 is disposed between the four hollow columns 2 and connected to the output rods of the screwdown screw 304 and the balance cylinder 310; the side wall of the upper stress frame 702 is provided with a plurality of clamping cylinder supports 704, and the clamping cylinder supports 704 are fixedly connected with vertical clamping cylinders 705; a fixing plate 707 opposite to the clamping cylinder support 704 is arranged on the side wall of the upper roller box assembly 7, and a clamping groove 708 matched with the output rod of the clamping cylinder 705 is formed in the fixing plate 707;
the opposite side surfaces of the two hollow upright posts 2 positioned below the same upper cross beam 3 are provided with side sliding plates 201, the side walls of the upper stress frame 702 are connected with the side sliding plates 201 through sliding blocks 202, and the upper stress frame has the function of transmitting the force on the upper roll system to the hollow upright posts; two sides of the upper stress frame 702 are provided with hydraulic cylinder accommodating cavities 709 corresponding to the positions under the upper cross beam 3, hydraulic cylinders 710 are arranged in the hydraulic cylinder accommodating cavities 709, and the bottom ends of the pressing screw rods 304 extend into the hydraulic cylinder accommodating cavities 709 and are connected with the input ends of the hydraulic cylinders 710;
the upper roller box assembly 703 comprises an upper roller box frame 711, the bottom surface of the upper roller box frame 711 is provided with a plurality of upper bearing seats 712 which are uniformly spaced and perpendicular to the upper cross beam 3, an upper supporting roller accommodating cavity 713 is formed between two adjacent upper bearing seats 712, and each upper supporting roller accommodating cavity 713 is internally provided with an upper supporting roller 714 which is horizontal and perpendicular to the upper cross beam 3; the side surface of the upper roller box frame 711 corresponding to the two ends of the upper supporting roller accommodating cavity 713 is connected with a vertically arranged guide shaft sleeve 715 through a hexagon nut, a disc spring 716 is sleeved outside the guide shaft sleeve 715, and a gasket 717 is sleeved outside the guide shaft sleeve 715 at the lower end of the disc spring 716; an upper connecting rod 718 is arranged in the guide shaft sleeve 715 in a penetrating manner, the bottom of the upper connecting rod 718 is connected with an upper working roll bearing seat 719, and two ends of the upper straightening roll 701 are arranged on the upper working roll bearing seat 719 in a penetrating manner and are in contact with the upper supporting roll 714.
As shown in fig. 15, the chucking cylinder 705 includes a chucking cylinder barrel 721, a first piston 722 and a second piston 723 are arranged in the chucking cylinder barrel 721, the first piston 722 is connected with a T-shaped head piston rod 724 extending out of the chucking cylinder barrel 721, a telescopic shaft 725 is connected between the first piston 722 and the second piston 723, the second piston 723 is connected with a rotating shaft 726 extending out of the chucking cylinder barrel 721, and the T-shaped head piston rod 724 and the rotating shaft 726 extending out of the chucking cylinder barrel 721 are sealed; a rotating cylinder 727 is sleeved outside the part of the rotating shaft 726 in the clamping cylinder body 721, a rotating groove 728 is formed in the outer wall of the rotating cylinder 727, the projection of the rotating groove 728 in the axial direction of the rotating cylinder 727 is a quarter arc, and a guide 730 matched with the rotating groove 728 is connected to the inner wall of the clamping cylinder body 721 through a fixing rod 729;
referring to fig. 16, the telescopic shaft 725 includes a sleeve 731 and a shaft 732 that are sleeved, one end of the sleeve 731 is fixedly connected to the first piston 722, one end of the shaft 732 is fixedly connected to the second piston 723, an inner wall of the sleeve 731 is formed with a plurality of axially disposed transmission grooves 733, and an outer wall of the shaft 732 is formed with a plurality of transmission protrusions 734 that are engaged with the transmission grooves 733. The structure of telescopic shaft makes the axostylus axostyle can follow axial motion in the axle sleeve, and the axostylus axostyle can drive the axle sleeve pivoting simultaneously.
Referring to fig. 15, when the port B is in oil inlet, the port a is in oil return, and the port C is closed, the piston rod of the "T" head is extended out; then when the oil inlet of the port C, the oil return of the port B and the port A are closed, the rotating shaft drives the T-shaped head piston rod to rotate for 90 degrees; when the oil inlet of the port A is closed, the oil return of the port B is performed, and the port C is closed, the piston rod of the T-shaped head retracts; finally, the port A, B, C is completely closed, and the hydraulic locking mechanism is in a locking working state. When the hydraulic locking mechanism needs to be unlocked, the oil inlet of the port B, the oil return of the port A and the port C are closed, and the piston rod of the T-shaped head extends out; then the oil inlet of the port B, the oil return of the port C and the port A are closed, and the piston rod of the T-shaped head rotates backwards by 90 degrees; the oil inlet of the port A, the oil return of the port B and the oil return of the port C are closed, and the piston rod of the T-shaped head retracts; finally, opening A, B, C is completely closed, and the hydraulic locking mechanism is in a loose-clamping state at the moment.
The clamping cylinder plays a role in connecting the upper roll box assembly with the upper stress frame, the upper roll box assembly and the upper stress frame are locked together by four clamping cylinders in a normal state, and the clamping cylinders are separated from the fixing plate when rolls need to be changed.
Comparing fig. 17 and fig. 18, the lower roller system device 6 includes a lower roller box frame 602 connected to the lower base frame 1, the top surface of the lower roller box frame 602 is provided with a plurality of lower bearing seats 603 uniformly spaced and perpendicular to the upper cross beam 3, a lower supporting roller accommodating cavity 604 is formed between two adjacent lower bearing seats 603, and a lower supporting roller 605 horizontally arranged and perpendicular to the upper cross beam 3 is arranged in each lower supporting roller accommodating cavity 604; the side of the lower roller box frame 602 is provided with lower connecting rods 606 arranged vertically corresponding to the two ends of the lower supporting roller accommodating cavity 604, the top of the lower connecting rods 606 is connected with lower working roller bearing seats 607, lower straightening rollers 601 parallel to and in contact with the lower supporting roller 605 are arranged between the lower working roller bearing seats 607 in a penetrating manner through bearings, and each lower straightening roller 601 is arranged corresponding to the gap between the upper straightening rollers 701.
Comparing fig. 19 and fig. 20, the top surface of the lower roller box frame 602, corresponding to the inlet and outlet of the working chamber, is provided with a plurality of side roller supporting roller bearing blocks 608 which are uniformly spaced and perpendicular to the upper cross beam 3, a side roller supporting roller accommodating chamber 609 is formed between two adjacent side roller supporting roller bearing blocks 608, and a side roller supporting roller 610 which is horizontally arranged and parallel to the lower supporting roller 605 is arranged in each side roller supporting roller accommodating chamber 609; the side of the lower roller box frame 602 corresponding to the two ends of the side roller supporting roller accommodating cavity 609 is provided with a vertically arranged side roller connecting rod 611, the top of the side roller connecting rod 611 is connected with a side roller bearing seat 612, a side roller 613 parallel to and in contact with the side roller supporting roller 610 is arranged between the side roller bearing seats 612 in a penetrating way through a bearing, and the relative height of the side roller 613 and the lower straightening roller 601 can be adjusted. Cover plate shafts 617 are arranged between the small straightening rollers 601 and the side rollers 613 and outside the side rollers 613, and a plurality of uniformly spaced cover plates 618 are arranged on the cover plate shafts 617.
With reference to fig. 2 and 21, an adjusting cavity 103 is formed in the lower base frame 1 and located right below the edge roller supporting roller 610, an edge roller load adjusting mechanism 104 is disposed in the adjusting cavity 103, the edge roller load adjusting mechanism 104 includes four jacks 105 disposed in the adjusting cavity 103 and located right below an edge roller bearing seat 612, and the top of the output end of each jack 105 is connected to the bottom surface of the edge roller bearing seat 612; the input ends of the jacks 105 are sequentially connected through a tooth coupling and a transmission shaft, and the input end of one jack 105 positioned at the most lateral side is connected with a hydraulic motor 106 through the tooth coupling and the transmission shaft;
as shown in fig. 2, a plurality of vertically arranged lifting cylinders 107 are further penetrated through the top surface of the adjustment chamber 103, a lifting shaft 108 perpendicular to a lower support roller 605 is connected to the upper end of the output rod of the lifting cylinder 107, and a lower bearing seat 603 is connected to the lifting shaft 108.
As shown in fig. 22, for example, the lower support roller 605 is taken as an example, the upper support roller 714 and the lower support roller 605 each include a support roller body 614, a self-aligning roller bearing 615 and a mandrel 616, the support roller body 614 is formed as a high-strength hollow roller ring, both ends of an outer circular surface of the support roller body 614 are provided with transition fit curved surfaces with a specific width, the self-aligning roller bearing 615 is installed on an inner wall of the support roller body 614, the mandrel 616 is inserted into a bearing hole of the self-aligning roller bearing 615, both ends of the mandrel 616 are engaged with each other and fixed in an upper bearing seat 712 or a lower bearing seat 603, both the upper bearing seat and the lower bearing seat are multi.
In the conventional straightening machine, because two adjacent supporting rollers need to be arranged in a staggered way at a certain distance, the bearing blocks for fixing the two supporting roller shafts also need to be arranged in a staggered way; the distance between the supporting rollers cannot be further reduced due to the structure of the bearing seat, so that the contact area between the supporting rollers and the straightening rollers is limited; and because there is the distance between the contact point of a plurality of backing rolls and straightener roll, at the actual straightening in-process, straightener roll can produce deformation along with the shape of public spare, and then just leads to straightener roll atress inhomogeneous (when straightener roll becomes the arc, only the backing roll in the middle of the backing roll atress that is close to both ends only bears little power or not atress, or the backing roll at middle backing roll atress both ends bears little power), thereby the backing roll atress inhomogeneous leads to the life of the backing roll of frequent atress generally shorter (2-3 months usually).
In the supporting roller system, the shafts of two adjacent supporting rollers penetrate through the hollow roller ring of the supporting roller body, so that two adjacent shafts are eccentrically penetrated through the bearing seat, and the contact positions of the two shafts are formed into two planes which are mutually meshed, so that the stability of the two shafts in connection is ensured. Under the condition that the mechanical property of the material allows, the distance between the two supporting rollers can reach 40cm-60cm, the contact area between the supporting rollers and the straightening roller is greatly improved, the phenomenon that the supporting rollers are stressed unevenly due to deformation of the straightening roller is reduced, and the service life of the supporting rollers is effectively prolonged (the service life of the supporting rollers is prolonged to more than 6 months through tests).
Therefore, the invention is not limited to the specific embodiments and examples, but rather, all equivalent variations and modifications are within the scope of the invention as defined in the claims and the specification.

Claims (10)

1. The utility model provides a high rigidity high load steel sheet straightening machine of multiroll distance, includes prestressing force interlocking frame, its characterized in that: the prestress interlocking frame comprises a lower base frame (1) arranged on the ground, two upper cross beams (3) are connected above the lower base frame (1) through four vertically arranged hollow upright posts (2), interlocking mechanisms (4) are respectively arranged between the lower base frame (1) and the hollow upright posts (2) and between the upper cross beams (3) and the hollow upright posts (2), and tensioning prestress mechanisms (5) are arranged in the hollow upright posts (2); the lower base frame (1) is connected with a lower roll system device (6) which is horizontally arranged, the top surface of the lower roll system device (6) is provided with a plurality of lower straightening rollers (601), the upper cross beam (3) is connected with an upper roll system device (7) which is opposite to the lower roll system device (6), and the bottom surface of the upper roll system device (7) is provided with a plurality of upper straightening rollers (701); the gap between the lower straightening roll (601) and the upper straightening roll (701) forms a working cavity for the steel plate to be straightened to pass through, and the lower straightening roll (601) and the upper straightening roll (701) are in transmission connection with a power machine through a universal coupling and a speed reducer.
2. The multi-roll-pitch high-rigidity high-load steel plate straightener according to claim 1, characterized in that: taut prestressing mechanism (5) including locating pull rod (501) in cavity stand (2), down base frame (1) go up the shaping have with cavity stand (2) complex down spliced pole (101), wear out the lower extreme of pull rod (501) down spliced pole (101) and through down nut (102) with base frame (1) is connected down, the shaping have on entablature (3) with cavity stand (2) complex last spliced pole (301), wear out the upper end of pull rod (501) go up spliced pole (301) and through upper nut (302) with entablature (3) are connected.
3. The multi-roll-pitch high-rigidity high-load steel plate straightener according to claim 2, characterized in that: the interlocking mechanism (4) comprises a vertically arranged body (401), two ends of the body (401) are bent ninety degrees towards the same side to form two buckling blocks (402), and the two buckling blocks (402) are respectively connected to the end of the hollow upright post (2) and the end of the upper connecting post (301) or the lower connecting post (101); the inner side surface of one of the buckling blocks (402) is formed into an inclined surface, a wedge pressing block (403) matched with the inclined surface is arranged on the inclined surface, and a plurality of adjusting screws (404) with tail ends abutting against the wedge pressing block (403) penetrate through the body (401).
4. The multi-roll-pitch high-rigidity high-load steel plate straightener according to claim 2, characterized in that: the upper roll system device (7) comprises an upper stress frame (702) and an upper roll box assembly (703) connected below the upper stress frame (702), and the upper stress frame (702) is arranged among the hollow upright columns (2) and is connected with the power equipment; the side wall of the upper stress frame (702) is provided with a plurality of clamping cylinder supports (704), and vertical clamping cylinders (705) are fixedly connected to the clamping cylinder supports (704); a fixing plate (707) opposite to the clamping cylinder support (704) is arranged on the side wall of the upper roll box assembly (703), and a clamping groove (708) matched with an output rod of the clamping cylinder (705) is formed in the fixing plate (707);
slider (202) are located on the lateral wall of going up atress frame (702), the both sides of going up atress frame (702) correspond be equipped with pneumatic cylinder holding chamber (709) under entablature (3), be equipped with pneumatic cylinder (710) in pneumatic cylinder holding chamber (709), power equipment's output stretches into pneumatic cylinder holding chamber (709) and with the input of pneumatic cylinder (710) is connected.
5. The multi-roll-pitch high-rigidity high-load steel plate straightener according to claim 4, characterized in that: the upper roll box assembly (703) comprises an upper roll box frame (711), a plurality of upper bearing seats (712) which are uniformly spaced and vertical to the upper cross beam (3) are arranged on the bottom surface of the upper roll box frame (711), an upper bearing roll accommodating cavity (713) is formed between every two adjacent upper bearing seats (712), and an upper bearing roll (714) which is horizontal and vertical to the upper cross beam (3) is arranged in each upper bearing roll accommodating cavity (713);
the side surface of the upper roller box frame (711) corresponding to the two ends of the upper supporting roller accommodating cavity (713) is connected with a guide shaft sleeve (715) which is vertically arranged through a hexagon nut, a disc spring (716) is sleeved outside the guide shaft sleeve (715), and a gasket (717) is sleeved outside the guide shaft sleeve (715) and positioned at the lower end of the disc spring (716); an upper connecting rod (718) penetrates through the guide shaft sleeve (715), the bottom of the upper connecting rod (718) is connected with an upper working roll bearing seat (719), and an upper straightening roll (720) which is parallel to and in contact with the upper supporting roll (714) penetrates through the upper working roll bearing seats (719) through a bearing.
6. The multi-roll-pitch high-rigidity high-load steel plate straightener according to claim 5, characterized in that: the clamping cylinder (705) comprises a clamping cylinder body (721), a first piston (722) and a second piston (723) are arranged in the clamping cylinder body (721), the first piston (722) is connected with a T-shaped head piston rod (724) extending out of the clamping cylinder body (721), a telescopic shaft (725) is connected between the first piston (722) and the second piston (723), the second piston (723) is connected with a rotating shaft (726) extending out of the clamping cylinder body (721), and the T-shaped head piston rod (724) and the rotating shaft (726) extending out of the clamping cylinder body (721) are both subjected to sealing treatment; a rotating cylinder (727) is sleeved outside the part, located in the clamping cylinder body (721), of the rotating shaft (726), a spiral rotating groove (728) is formed in the outer wall of the rotating cylinder (727), the projection of the rotating groove (728) in the axial direction of the rotating cylinder (727) is a quarter arc, and a guide piece (730) matched with the rotating groove (728) is connected to the inner wall of the clamping cylinder body (721) through a fixing rod (729);
the telescopic shaft (725) comprises a sleeve (731) and a shaft rod (732) which are sleeved, one end of the sleeve (731) is fixedly connected to the first piston (722), one end of the shaft rod (732) is fixedly connected to the second piston (723), a plurality of axially-arranged transmission grooves (733) are formed in the inner wall of the sleeve (731), and a plurality of transmission convex strips (734) matched with the transmission grooves (733) are formed in the outer wall of the shaft rod (732).
7. The multi-roll-pitch high-rigidity high-load steel plate straightener according to claim 6, characterized in that: the lower roll system device (6) comprises a lower roll box frame (602) connected to the lower base frame (1), a plurality of lower bearing seats (603) which are uniformly spaced and vertical to the upper cross beam (3) are arranged on the top surface of the lower roll box frame (602), a lower supporting roll accommodating cavity (604) is formed between every two adjacent lower bearing seats (603), and a lower supporting roll (605) which is horizontally arranged and vertical to the upper cross beam (3) is arranged in each lower supporting roll accommodating cavity (604); the side surface of the lower roller box frame (602) is provided with lower connecting rods (606) which are vertically arranged at positions corresponding to the two ends of the lower supporting roller accommodating cavity (604), the top of each lower connecting rod (606) is connected with a lower working roller bearing seat (607), the two ends of each lower straightening roller (601) are connected to the lower working roller bearing seats (607) through bearings and are parallel to and in contact with the lower supporting rollers (605), and each lower straightening roller (601) is arranged corresponding to a gap between the upper straightening rollers (701);
a plurality of side roller supporting roller bearing blocks (608) which are uniformly spaced and vertical to the upper cross beam (3) are arranged at positions, corresponding to the inlet and the outlet of the working cavity, on the top surface of the lower roller box frame (602), a side roller supporting roller accommodating cavity (609) is formed between every two adjacent side roller supporting roller bearing blocks (608), and side roller supporting rollers (610) which are horizontally arranged and parallel to the lower supporting roller (605) are arranged in each side roller supporting roller accommodating cavity (609); correspond on lower roll box frame (602) side the position at limit roller backing roll holding chamber (608) both ends is equipped with vertical limit roller connecting rod (611) of arranging, the top of limit roller connecting rod (611) is connected with limit roller bearing frame (612), wear to be equipped with through the bearing between limit roller bearing frame (612) with limit roller (613) that limit roller backing roll (610) are parallel and contact, limit roller (613) with the relative height of lower straightener roll (601) can be adjusted.
8. The multi-roll-pitch high-rigidity high-load steel plate straightener according to claim 7, characterized in that: the upper supporting roller (714) and the lower supporting roller (605) comprise a supporting roller body (614), a self-aligning roller bearing (615) and a mandrel (616), the supporting roller body (614) is formed into a high-strength hollow roller ring, transition fitting curved surfaces with certain widths are arranged at two ends of the outer circular surface of the supporting roller body (614), the self-aligning roller bearing (615) is installed on the inner wall of the supporting roller body (614), the mandrel (616) penetrates through a bearing hole of the self-aligning roller bearing (615), and two ends of the mandrel (616) are mutually meshed and fixed in the upper bearing seat (712) or the lower bearing seat (603).
9. The multi-roll-pitch high-rigidity high-load steel plate straightener according to claim 8, characterized in that: an adjusting cavity (103) is arranged on the lower base frame (1) and right below the side roller supporting roller (610), a side roller load adjusting mechanism (104) is arranged in the adjusting cavity (103), the side roller load adjusting mechanism (104) comprises a plurality of jacks (105) which are arranged in the adjusting cavity (103) and are positioned right below the side roller bearing seat (612), and the top of the output end of each jack (105) is connected to the bottom surface of the side roller bearing seat (612); the input ends of the jacks (105) are sequentially connected through a tooth coupling and a transmission shaft, and the input end of one jack (105) positioned at the most lateral side is connected with a hydraulic motor (106) through the tooth coupling and the transmission shaft;
a plurality of vertically arranged lifting cylinders (107) are further arranged on the top surface of the adjusting cavity (101) in a penetrating mode, the upper ends of output rods of the lifting cylinders (107) are connected with lifting shafts (108) perpendicular to the lower supporting rollers (605), and the lower bearing seats (603) are connected to the lifting shafts (108).
10. The multi-roll-pitch high-rigidity high-load steel plate straightener according to claim 1, characterized in that: the upper beam (3) and the upper roll system device (7) are connected with power equipment, the upper beam (3) and the upper roll system device (7) are located on the same side face, opposite to the two hollow upright posts (2), of the upper beam (3), side sliding plates (201) are arranged on the opposite side faces, the upper roll system device (7) is connected to the side sliding plates (201) through sliders (202), and the upper roll system device (7) can move in the vertical direction under the action of the power equipment and the side sliding plates (201).
CN201911221863.0A 2019-12-03 2019-12-03 Multi-roll-pitch high-rigidity high-load steel plate straightening machine Active CN111036711B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112427489A (en) * 2020-11-30 2021-03-02 中冶华天工程技术有限公司 Automatic roller changing process of row straightening machine

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Publication number Priority date Publication date Assignee Title
EP0021791A1 (en) * 1979-06-18 1981-01-07 The Yoder Company A method of roll forming stock and forming leveller
CN1411925A (en) * 2001-10-19 2003-04-23 中国第二重型机械集团公司 Plate and band material roll gap adjustable flattening machine
CN201693117U (en) * 2010-04-09 2011-01-05 太原重工股份有限公司 Double-post inclined prestressed stand for free forging hydraulic press
CN203599285U (en) * 2013-12-24 2014-05-21 北京京诚之星科技开发有限公司 Variable roller spacing straightener
CN106271735A (en) * 2016-08-30 2017-01-04 佛山市普拉迪数控科技有限公司 For processing the manual type Polyhedral fixture of bar shaped sheet metal component and using its lathe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0021791A1 (en) * 1979-06-18 1981-01-07 The Yoder Company A method of roll forming stock and forming leveller
CN1411925A (en) * 2001-10-19 2003-04-23 中国第二重型机械集团公司 Plate and band material roll gap adjustable flattening machine
CN201693117U (en) * 2010-04-09 2011-01-05 太原重工股份有限公司 Double-post inclined prestressed stand for free forging hydraulic press
CN203599285U (en) * 2013-12-24 2014-05-21 北京京诚之星科技开发有限公司 Variable roller spacing straightener
CN106271735A (en) * 2016-08-30 2017-01-04 佛山市普拉迪数控科技有限公司 For processing the manual type Polyhedral fixture of bar shaped sheet metal component and using its lathe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112427489A (en) * 2020-11-30 2021-03-02 中冶华天工程技术有限公司 Automatic roller changing process of row straightening machine

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