64results about How to "Avoid broken belt" patented technology

The invention discloses a graded calendering molding method of a prelithiation anode. The graded calendering molding method comprises the steps that: a graded calendering lithium foil method is employed, the primary calendering of a lithium strip at pre-pressing rollers is completed, release films are introduced between main pressing rollers to assist in the secondary calendering of the lithium strip to form a lithium foil, and finally, on the release films attached at the fast roller sides of the main pressing rollers, the prelithiation anode is prepared through rolling of composite rollers and recombination of a negative pole piece under the transfer printing effect of the release films so that the large-scale production of the prelithiation anode is achieved, the production is low and the graded calendering molding method is safe and reliable.

The invention relates to the field of a lithium ion battery, in particular relates to a lithium ion battery pole plate and a preparation method thereof. The pole plate comprises a current collector and an active substance layer, wherein the active substance layer is attached onto the surface of the current collector, a groove is formed in the active substance layer and is used for embedding a tab, the side wall of the groove is the cross section of the active substance layer, and the thickness of the cross section, at the at least one side wall, of the active substance layer is gradually reduced. The lithium ion battery pole plate is prepared from a hot shrinkage adhesive and a foamed adhesive with a certain three-dimensional shape, and the defect that the edge of a reserved position of the tab is thickened after the ordinary foamed adhesive is stripped is avoided; during the drying process of an active material, the above process is completed, thus, the installation reserved position of the tab is formed, the production efficiency can be greatly improved, and the production cost is reduced.

Disclosed is a detection and quality judgment method for strip steel weld surface appearance. The surface of a weld is scanned by a linear laser; the values such as weld stack height, depression, undercut and misalignment are calculated according to scanned data; the quality of the weld is judged according to the values; accordingly, the surface appearance quality of the weld is judged continuously. The method has the advantages that the surface appearance of the weld can be detected fast and evaluated fast, fast continuous operation of an acid tandem rolling is ensured, and breakage of strip steel is prevented.

The invention relates to a thermal annealing acid-washing method of a stainless steel wide and thick plate coil, which comprises the following steps of: uncoiling an inlet of the stainless steel wide and thick plate coil, welding, continuously annealing, breaking scales shot-blasting, acid-washing, flattening, and coiling an outlet of the stainless steel wide and thick plate coil, wherein the groove depth of a welding girder is 1.0-1.5mm; 3-6 annealing furnaces with the total length of 75-150m are adopted in continuous annealing, the annealing temperature is 1000-1150 DEG C, and the annealing time is 10-20min; in the shot blasting process, the blasting speed is 1500-2250rpm, the blasting quantity is 600-100kg / min, and the blasting particle has a grain size of 0.5-0.7mm; and in the acid washing step, acid washing is carried out by adopting mixed acid of hydrofluoric acid and nitric acid in 3-6 sections of grooves. By adopting the method, in a continuous annealing acid-washing process of the stainless steel wide and thick plate coil, problems of strip breakage, poor material property, poor surface quality, reeling off, surface scratching and the like can be avoided as much as possible.

The invention discloses a high-performance tin-phosphor bronze strip and a production method thereof. The high-performance tin-phosphor bronze strip comprises, by weight percent, 9% to 11% of Sn, 0.03% to 0.35% of P, not larger than 0.2% of Zn, not larger than 0.1% of Fe, not larger than 0.2% of Pb and the balance copper. Through the strict control over a casting technology, a rolling technology and an annealing technology of a tin-phosphor bronze alloy, a high-performance tin-phosphor bronze strip alloy product with the tin content ranging from 9% to 11% can be produced, and the application requirement of an IT industry and an electrommunication industry for a high-elasticity, high-strength and high-hardness copper alloy can be met.

The invention discloses a winding cell and a battery. The winding cell comprises electrode pieces, a separator and an adhesive tape, wherein the electrode pieces comprise a positive electrode piece and a negative electrode piece; the separator is arranged between the positive electrode piece and the negative electrode piece; the adhesive tape is attached to the surface of the positive electrode piece and is attached to a corner position of the positive electrode piece; the adhesive tape can also be attached to the surface of the negative electrode piece and is attached to a corner position ofthe negative electrode piece; and one side, or, both sides, of the electrode piece is bonded with the adhesive tape. By a bonding mode, safety hazards caused by cracking occurring during the hot pressing process of the electrode piece can be effectively avoided, precipitation of metal lithium is prevented, and the safety performance of the winding cell is improved.

The invention discloses a piece-making and winding joining device which is used for process control of a pole piece between a piece-making system and a winding system of an electric core fully automatic winding machine. The piece-making and winding joining device comprises a vertically arranged substrate of the fully automatic winding machine, a swing deviation correction part arranged on the substrate, a pole piece driving mechanism and a tension control mechanism, wherein the delivery direction of the pole piece is parallel with the substrate; the swing deviation correction part is connected after the piece-making procedure, is internally provided with a snakelike buffer region of the pole piece, and is used for performing swing deviation correction on the pole piece after subjected to the piece-making procedure; and the pole piece driving mechanism and the tension control mechanism are connected sequentially, and are used for drawing the pole piece in the snakelike buffer region and performing tension control on the pole piece which enters into the winding procedure. The piece-making and winding joining device has the advantages that: the swing deviation correction mechanism removes vertical deviation between the pole piece and the vertical substrate efficiently, enables the edge positioning precision of the pole piece to be high and enables the pole piece to enter into the winding part in parallel and precisely; and the tension control mechanism controls the tension of the pole piece, and adopts different tensions for pole pieces with different widths so as to prevent corrugation and breakage of the pole pieces.

The invention relates to a cold tandem mill strip steel edge trimming controlling method and belongs to the technical field of cold tandem rolling devices. According to the method, based on existing cold tandem mill lines, a small crescent punched edge with a punched edge depth of 70mm and a large crescent punched edge with a punched edge depth of 120mm are set; when the width difference of strip steel in the front and rear of a welding seam is in a range from 0mm to 75mm, a notcher is controlled to perform a small crescent edge punching at a position of the welding seam, and a circle shear is controlled to perform an edge trimming at the position of the welding seam; when the width difference of strip steel in the front and rear of the welding seam is larger than 75mm and the front and back strip steel is narrow in front and wide in back, the notcher is controlled to perform the small crescent edge punching at a position 1050+ / -30mm in the front of the welding seam, and the circle shear is controlled to perform the edge trimming at a position 1150+ / -30mm in the front of the welding seam; if the front and back strip steel is wide in front and narrow in back, the notcher is controlled to perform the small crescent edge punching at a position 850+ / -30mm in the rear of the welding seam, and the circle shear is controlled to perform the edge trimming at a position 750+ / -30mm in the rear of the welding seam; and otherwise existing processes are performed. According to the method, the small crescent edge punching is innovated, the edge punching position and depth of the notcher and the edge trimming position of the circle shear are respectively judged and adjusted according to the width difference of strip steel in the front and rear of the welding seam, and thereby a sufficient tensile strength of the strip steel at the position of the welding seam can be guaranteed so as to prevent strip breakage.

The invention provides a method for preparing an aluminum alloy plate. The method comprises the following steps of: a) rolling an LY12 aluminum alloy blank to obtain a blank of 4.0 to 6.0mm aluminum alloy plate; b) making the first edge cutting of the blank of the aluminum alloy plate and preannealing the blank; c) rolling the blank of the aluminum alloy plate to obtain the blank of 2.0 to 2.5mm aluminum alloy plate; d) interannealing the blank of the aluminum alloy plate; e) rolling the blank of the aluminum alloy plate to obtain the blank of 0.7 to 0.9mm aluminum alloy plate; f) performing the secondary edge cutting of the blank of the aluminum alloy plate; g) interannealing the blank of the aluminum alloy plate; and h) continuously rolling the blank of the aluminum alloy plate to obtain the blank of 0.25 to 0.35mm aluminum alloy plate. In the method, by performing twice edge cutting treatments of the blank of the aluminum alloy plate in different thicknesses, the strip breakage caused by the enlargement of the cracked edges generated on the edges in the following rolling process can be avoided; and when the blank of the aluminum alloy plate is rolled to be between 2.0 and 2.5mm and between 0.7 and 0.9mm, the first interannealing treatment is carried out respectively, so that 0.25 to 0.35mm aluminum alloy plate is rolled successfully.

The invention discloses a method for preventing thin strip steel from being fractured at the start moment. The method is applied to a cold continuous rolling unit. The method comprises the steps thatrolling force, formed at the stop moment, of the cold continuous rolling unit is acquired as memory rolling force; then, when roller replacement of the cold continuous rolling unit is completed and each roller gap is in the opened state, current winding tension corresponding to the start moment is determined, wherein the current winding tension is 1.5-3 times set winding tension, and furthermore,the covering phenomenon of a rolling mill section can be eliminated; and in addition, corresponding current actual rolling force, formed at the start moment, of each rack of the cold continuous rolling unit is determined based on the memory rolling force, and each rack of the cold continuous rolling unit is controlled to conduct downwards-pressing according to the corresponding current actual rolling force, formed at the start moment, of each rack, wherein the current actual rolling force of the first rack, the current actual rolling force of the second rack, the current actual rolling force of the third rack and the current actual rolling force of the fourth rack of the cold continuous rolling unit each accounts for 90-95% of the memory rolling force. By means of the method, the strip steel can be prevented from being fractured due to the excessively-large rolling force, thus strip fracturing of a rolling mill is avoided, and the cold continuous rolling unit is controlled to be started.

The invention relates to a pole lug leveling device. The pole lug leveling device comprises a support connected with a carrier roller, and a brush arranged on the support. The brush is driven by a motor to rotate, and the distance between the brush and the carrier roller can be adjusted. The lengths of bristles of the brush are gradually increased from the two sides to the middle. According to the above technical scheme, when a pole lug passes through the carrier roller, the brush levels the pole lug, the pole lug is made to be attached to the carrier roller, and therefore the phenomenon of belt breaking or pole lug falling off due to pole lug root tearing is avoided; and the production efficiency and the yield of the laser pole lug forming procedure and the subsequent winding procedure are effectively improved.

The invention relates to an automatic control technology in the smelting field, and discloses a control method capable of preventing strip steel of a galvanizing unit from deflection and belt braking in operation. The problems that in the prior art, the galvanizing unit still runs at a high speed after the strip steel is deflected, therefore, the strip steel is easily broken, a large number of waste products and a large number of inferior-quality products are produced due to machine halt of the galvanizing unit, and serious damage is caused to a device are solved. The method includes a first step of collecting deflection data of the current running strip steel through a deflection correcting detection device, and transmitting the deflection data to a control unit; a second step of enabling the control unit to compare the deflection data with a preset deflection threshold limit value, and controlling the galvanizing unit to conduct speed reducing running if the deflection data are larger than or equal to the deflection threshold limit value; controlling the galvanizing unit to continuously run at the current speed if the deflection data are smaller than the deflection threshold limit value. The control method capable of preventing the strip steel of the galvanizing unit from the deflection and the belt braking in the operation is suitable for automatic control of the galvanizing unit in smelting.

The invention discloses a dynamic specification-changing moving method for working rollers of a cold continuous mill. When the length L<weld> between a weld of a current roll of strip steel and the next roll of strip steel and a first rack is equal to t<WS>(1).V<0>, the working roller of the first rack starts to move from the current position to the set moving position of the working roller of the next roll of strip steel. When the length L<weld> between the weld of the current roll of strip steel and the next roll of strip steel and the first rack is equal to [t<WS>(2).V<1>-L<12>]H<1> / H<0>, the working roller of a second rack starts to move from the current position to the set moving position of the working roller of the next roll of strip steel. When the length L<weld> between the weld of the current roll of strip steel and the next roll of strip steel and the first rack is equal to [t<WS>(3).V<2>-L<13>]H<2> / H<0>, the working roller of a third rack starts to move from the current position to the set moving position of the working roller of the next roll of strip steel. By means of the dynamic specification-changing moving method, the control precision for thinning of edges of the head and tail of the strip steel can be guaranteed, and the strip steel is prevented from being broken in the positions of welds.

The present invention provides a method and apparatus for rolling a strip weld. The method includes controlling the elongation in the wet flat mode to a closed state when the strip weld passes the leveling machine; controlling the rolling speed of the leveling machine at 60-100 m / min; controlling the rolling force of the first frame of the leveling machine to be 2 to 2.5MN, and the rolling force of the second frame to 1.8 to 2MN; controlling the inlet tension, the intermediate tension and the outlet tension of the leveling machine to 80% of the preset value; so that when the material tracking system detects that there are two punches on the strip, the leveling machine is over-welded, the strip weld is safely welded to avoid breaking; after the weld is rolled, the leveling machine is adjusted to the normal rolling state, and the strip is subjected to normal rolling. Thus, when it is not necessary to reduce the speed of a furnace area, the strip weld is rolled at high speed, and stability in operation of the furnace area is guaranteed.

The invention discloses a non-oriented silicon steel and a production method thereof. Molten steel is smelted by adopting a vacuum induction furnace. Molten steel is directly cast into a cast belt with the thickness between 1mm and 3mm through a pair of crystallization rollers rotating in opposite directions. The casting temperature of the molten steel is between 1500 DEG C and 1700 DEG C. The cast belt is subjected to one pass or multiple passes hot rolling and rolled into hot-rolled strip steel with thickness being 0.7mm and 2.5 mm. The hot rolling temperature is between 800 DEG C and 1150 DEG C, and the hot-rolled strip steel is coiled into a roll at the temperature between 500 DEG C and 800 DEG C. Normalizing annealing is conducted on the hot-rolled steel roll after the hot-rolled steel roll is subjected to a levelling or tension levelling working procedure with the elongation rate being 1.0% and 5.0%, and the normalizing annealing temperature is between 700 DEG C and 1000 DEG C. After the steel roll after normalizing annealing is subjected to cold rolling and the final annealing and coating working procedures, low-iron loss and high magnetic induction non-oriented silicon steel products are acquired. The non-oriented silicon steel products manufactured with the production method has high-proportion magnetic induction-favorable <100> and <110> structures, and the product magnetic induction is above 1.80 T.

The invention discloses a band steel return control apparatus after the shutdown of a continuous annealing furnace. The apparatus comprises a mode selection device, an execution mechanism, an automatic tension control mechanism, an automatic time control mechanism and an operation table, wherein the mode selection device can select one of an automatic tension mode, an automatic time mode and a manual mode; the execution mechanism indicates equipment of the continuous annealing furnace to execute a band steel return operation or a tension reduction operation; the automatic tension control mechanism controls the execution mechanism to gradually reduce the tension of the continuous annealing furnace in time period; the automatic time control mechanism controls the execution mechanism to uniformly return the equal-length band steel with the work segment as a base in time period; and the operation table receives a manual operation instruction, and controls the return operation of the execution mechanism to be carried out according to the manual operation instruction when the mode selection device selects the manual mode. According to the invention, the band steel can be automatically returned to the furnace after the abnormal shutdown of the technical segment of the continuous annealing furnace, so problems comprising band breakage, furnace deformation, furnace roller displacement and the like can be effectively prevented.

The present invention discloses a cold rolling steel strip and a production method thereof. The cold rolling steel strip is produced by adopting waste iron and steel, chromium, aluminum, nickel, titanium, cobalt, lanthanum, cerium, rare earth and other raw material, and carrying out smelting, forging, hot rolling, cold rolling and other steps. The cold rolling steel strip has characteristics of easy production and good quality, and is applicable for automobiles, motorcycles, electric resistance furnaces, electric heating components and other industries.

The invention relates to an early warning method for pocking marks on the surface of strip steel of an annealing set. The early warning method for the pocking marks on the surface of the strip steel of the annealing set comprises the following steps of: keeping the depth value of the pocking marks of the strip steel in linear relation with speed difference of a furnace roller and the strip steel at an SF (Surface Flash) process section: establishing an early warning model through linear regression, wherein the relation can be described by using the following formula that: the depth of the pocking marks is equal to the sum of a and the product of b and the speed difference; the difference value of roller speed of an SF furnace roller of a cold-rolled continuous annealing set is used as an input variable to obtain an estimated value of the depth of the pocking marks; and a and b are regression coefficients; expressing by using the average speed of n furnace rollers during calculation of the speed of the strip steel in the SF furnace, wherein supposing that the speeds of the furnace rollers are v1, v2, ......, vn, the speed of the strip steel is equal to (v1+v2+......+vn) / n; and judging the quality of the pocking marks by extracting the wave peak characteristic of a curve. In the method, the depth of the pocking marks is set, and a peak value is used for warning, so that early warning of the pocking mark defect can be accurately realized.

The invention discloses a high-performance tin-phosphor bronze strip and a production method thereof. The high-performance tin-phosphor bronze strip comprises, by weight percent, 9% to 11% of Sn, 0.03% to 0.35% of P, not larger than 0.2% of Zn, not larger than 0.1% of Fe, not larger than 0.2% of Pb and the balance copper. Through the strict control over a casting technology, a rolling technology and an annealing technology of a tin-phosphor bronze alloy, a high-performance tin-phosphor bronze strip alloy product with the tin content ranging from 9% to 11% can be produced, and the application requirement of an IT industry and an electrommunication industry for a high-elasticity, high-strength and high-hardness copper alloy can be met.

The invention provides a method and a system for maintaining a mill tensiometer. The method comprises the steps of detecting mill interstand tension by adopting pressure heads of the tensiometer; using the pressure heads of the tensiometer on the operating side and the driving side as collecting sources, and obtaining tension values from the collecting sources; judging whether the tension values obtained from all of the collecting sources are abnormal, and determining the collecting source of the failure side if the tension values are abnormal; and giving up to obtain the tension value of thecollecting source of the failure side, and replacing the tension value of the collecting source of the failure side with the tension value of the collecting source of the non-failure side. When the detection of the tensiometer on single side is abnormal, the tension value of the failure side can be replaced with the tension detection numerical value of the normal side for production by adopting the method, so that high-speed strip breakage and shutdown are avoided. Onsite multiple simulation tests indicate that the method is really feasible.

The invention discloses a control system for the thickness of a rolled plate. The control system comprises a plate thickness control unit, an operation control unit, a rolling mill control unit, a main control unit, at least two thickness measurers and at least two hydraulic cylinder servo valves, wherein the main control unit is connected with the plate thickness control unit, the operation control unit and the rolling mill control unit respectively, and sends commands of start-up, deceleration, acceleration or stop to a rolling mill after receiving instructions of the plate thickness control unit. According to the control system disclosed by the invention, if the thickness of the rolled plate exceeds a set range value via detection carried out through feeding back detection data of a thickness measurer control system to a plate thickness control module, the rolling mill realizes automatic deceleration and stops, thus breakage of a steel belt due to thickness fluctuations is avoided, and the production cost is effectively saved; and in particular, monitoring for the thickness of the rolled plate is exerted better on the basis of the thickness measurers, and unit personnel can much conveniently operate.

The invention belongs to the technical field of a battery and particularly relates to a device for improving battery pole piece slit curling. The device includes a coating module (1) and a drying module (2), wherein the coating module (1) is used for identifying a single-sided pole piece having a profiled slit and coating the single-sided pole piece having the profiled slit, and the drying module(2) is used for identifying the single-sided pole piece having the profiled slit from the coating module (1) and drying the single-sided pole piece having the profiled slit. The device is advantaged in that the structure is simple, a problem of pole piece slit curling is effectively solved, and the device is intelligent and efficient and is convenient to use. The invention further provides a method for improving battery pole piece slit curling, and work stability and efficiency are improved.

A pole piece passing roller structure is disclosed, It comprises a first passing roller, a first central shaft and a first fixing assembly, wherein one end of the first passing roller inner wall is provided with a first rolling assembly, the other end of the first passing roller inner wall is provided with a second rolling assembly, the first passing roller is connected with the first central shaft through the first rolling assembly and the second rolling assembly, the second rolling assembly is connected with the first central shaft, and the first fixing assembly is connected with one end ofthe first central shaft. The pole piece passing roller structure realizes that the first bearing is not subjected to axial pressure and ensures that the first bearing is in a zero clearance state, sothat the first passing roller is subjected to less frictional force when rotated, the inertia of the first passing roller is small, avoiding the broken belt or wrinkling caused by excessive moment ofinertia of the pole piece, The axial movement of the first passing roller is reduced, a gap is arranged between the second bearingand the second step of the first central shaft, and the axial pressuregenerated by squeezing the second bearing is avoided, so that the second bearing is only used for supporting the first passing roller, so that the resistance of the first passing roller is smaller, and the quality and the yield of the lithium battery cell production are greatly improved.

The invention relates to a device for preventing the upwarping of a lithium battery coating pole piece, and relates to a lithium battery pole piece, which solves the technical problems of the traditional lithium battery pole piece coating device that the edge is upwarped in the coating process of a single surface. The device comprises a coater drying oven outlet and a floating roll which is arranged in front of the drying oven outlet, wherein a passing roll which is contacted with the pole piece is installed on the side walls of two coaters in the coater drying oven outlet and above the pole piece. The side walls of the two coaters are respectively provided with a through hole, a small shaft on each of the two ends of the passing roll is in clearance fit with the through hole, and the passing roll is contacted with the pole piece to rotate in the transmission process. The device is used for a lithium battery pole piece coating process and has the advantages that the structure is simple, the upwarping of the coating pole piece can be effectively prevented, and the production efficiency and the quality of the pole piece can be improved.

The invention provides a raw material plate starting tension control method and related equipment.The method comprises the steps that the target rolling thickness of materials and the actual rolling thickness of the materials at an outlet of a rolling mill are obtained; according to the target material rolling thickness and the actual material rolling thickness, the outlet tension amplification multiple of the rolling mill is determined; and determining the target outlet tension of the rolling mill according to the outlet tension amplification multiple. According to the raw material plate starting tension control method provided by the embodiment of the invention, the phenomenon that the rolling requirement cannot be met due to the fact that the outlet tension of the rolling mill is reduced due to large fluctuation of the tension when the raw material plate is started can be prevented, so that the possibility of material deviation is reduced, belt breakage of the material is avoided, and the production efficiency is improved. Reliable guarantee is provided for a rolling mill to smoothly start a raw material plate, stable production of a continuous rolling unit is guaranteed, and the rolling cost is effectively controlled.

The embodiment of the invention relates to the technical field of steel rolling. Specifically, the present invention relates to a plate roll head and tail intelligent slitting method based on an industrial big data platform and the industrial big data platform. The method comprises the following steps: before a target plate coil enters a continuous acid continuous rolling process, judging whetherthe target plate coil meets a set head and tail cutting condition or not according to high-frequency curve data, defect data, first plate coil data and second plate coil data of the target plate coil;and then judging whether the target plate coil has the belt breaking risk or not, and determining the head and tail cutting meter number and the cutter number of the target plate coil, so that afterthe target plate coil enters the continuous acid continuous rolling process, the target plate coil can be slit according to the head and tail cutting meter number and the cutter number, and belt breaking of the target plate coil in the continuous acid continuous rolling process is avoided.

The invention provides a method for improving the strength of a pole piece of a square lithium ion battery after Mark hole drilling, and relates to the technical field of electric power. The inventiondiscloses a method for improving the strength of a pole piece of a square lithium ion battery after Mark hole drilling. The method comprises the following steps: S1, drawing a cutting pattern row ofthe lithium ion battery for punching Mark holes in two sides, and arranging circular grooves of the Mark holes on the edges of tabs (the pattern row of the Mark holes is drawn by adopting laser drawing software when the punching pattern row of the Mark holes is drawn); and S6, removing waste generated in the machining process in time, so that the waste is prevented from being sucked into the punched position, and machining deviation is avoided. Program parameters can be adjusted through the steps of S2, S3 and the like, the punching mode of the parallel positions of the two sides of the pole piece is changed into the two-side staggered punching mode, the lower limit of specific optimization may have a certain difference, and the higher the tensile strength of the pole piece depends on theMark hole size recognition capacity of a winding machine, therefore, it can be seen that the purpose of preventing strip breakage during Mark hole punching can be achieved.

The invention provides a steel belt shearing butt welding machine and a welding method thereof. A belt head clamping device and a belt tail clamping device are used for clamping the belt head and thebelt tail of a steel belt correspondingly, the belt tail clamping device can do reciprocating motion in the conveying direction of the steel belt, and centering devices are arranged on the two outer sides of the belt head clamping device and the belt tail clamping device correspondingly. A sliding trolley is arranged between the belt head clamping device and the belt tail clamping device and can slide between the two sides of the steel belt in a reciprocating manner, a stand column is arranged on one side of the sliding trolley, and a cross beam is connected to the top end of the stand column.A shearing device is arranged between the sliding trolley and the cross beam. The welding device comprises an upper welding wheel, a lower welding wheel and an auxiliary supporting wheel, the upper welding wheel is mounted on the lower surface of the cross beam in a manner of being capable of rotating and ascending and descending, the lower welding wheel is rotatably mounted on the sliding trolley, the upper welding wheel and the lower welding wheel are arranged in an up-down corresponding manner, and the auxiliary supporting wheel is rotatably mounted on the sliding trolley and located on one side of the lower welding wheel. The steel belt shearing butt welding machine can improve the welding quality and avoid belt breakage.

The invention discloses a roll plate thickness control method which comprises the following steps: feeding a steel plate into a rolling mill and performing first-pass rolling; monitoring the thicknesses of the steel plate in real time by use of a thickness meter before and after rolling; when the thickness meter measures that thickness real-time data of the steel plate before rolling exceeds set data of thickness before rolling by 2% but less than 5%, performing decelerated production by use of a rolling mill unit; when the thickness meter measures that thickness real-time data of the steel plate before rolling exceeds set data of thickness before rolling by more than 5%, halting the rolling mill unit. A thickness meter control system is used for feeding back test data to an industrial control module; when the roll plate thickness is measured to be out of a set value range, the rolling mill realizes operation from automatic deceleration to stoppage, steel band breakage caused by thickness fluctuation is avoided, the production cost is effectively saved, and especially the roll plate thickness control method is capable of better monitoring the roll plate thickness and facilitating operations of operating personnel on the basis of the thickness meter.

The invention provides a pickling-rolling process of thin-gauge household appliance steel of 300 mu]m and below and belongs to the technical field of a steel product thin-plate rolling processes. According to the technical scheme, the cut-off amounts of a pickled-rolled head and a pickled-rolled tail are controlled to be larger than 5 m, the meshing amount of a withdrawal and straightening machine is increased to be 40 mm, the shear amount of a circle shear does not exceed 60 kilometers, the speed of a fifth rolling mill outlet is controlled to range from 400 m / min to 800m / min, the concentration of an emulsified liquid tank 1 is 3.0%-3.5%, the concentration of an emulsified liquid tank 3 is controlled to be 0.5%-1.0%, and a working roller and a middle roller within a certain rolling amount range are adopted. By means of the pickling-rolling process, the belt breakage risk in the rolling process is reduced, the quality of the thin-gauge household appliance steel of 300 mu]m and below is also ensured, accordingly the pickling-rolling yield of the thin-gauge household appliance steel of 300 mu]m and below is remarkably improved, the problem that ultra-thin steel belts are very difficult to roll is solved, and the pickling-rolling process makes contribution to rolling of the ultra-thin steel belts and has remarkable economic benefit.