50results about How to "Improve product surface quality" patented technology

The invention provides a method for controlling a finishing elongation rate of strip steel by utilizing second flow, comprising the following steps of: respectively measuring an actual speed value and an actual tension value by using an encoder and a tension meter for measuring the speeds of an inlet and an outlet of a finishing machine; additionally arranging a second flow closed loop control system module in a programmable controller of the finishing machine, i.e., a PLC (Programmable Logic Controller); additionally arranging a second flow function option button in a human-computer interface; adopting a speed control mode for a main motor as well as a front tension roller and a back tension roller of the finishing machine; introducing an outlet tension deviation matching coefficient to a rolling force controller; and carrying out gain processing on a system function according to an input time interval. By using the method, the set value of the rolling force as well as parameters such as speed, tension and the like before and after finishing are not needed to be changed according to the material of the strip steel, the speed and the tension before and after the finishing are in astable state, the elongation rate is controlled more precisely, the steel plate pattern and the elongation rate index before and after the specification changes are effectively improved, a favorable surface quality of a product is obtained, and the yield of the strip steel is increased.

The invention discloses a compact continuous casting and tandem rolling method for producing hot rolling strip steel, including the following steps: 1) liquid molten steel passes through a long nozzle from a ladle to be cast to a pouring box, flows through a submerged nozzle from the pouring box to be cast in a crystallizer of a continuous caster and is continuously cooled in the continuous caster to form a casting blank; 2) a shearing machine is used for cutting a flat blank into certain size; 3) the flat blank enters a tunnel roller hearth heating furnace for heating; 4) the continuous caster is provided with a plurality of casting flows, one of which is in collineation with a rolling mill, the casting blank of other flows passes through a swinging section and is converged with the casting blank of the collinear flow and then is descaled by high pressure water; 5) the casting blank carries out rough rolling into an intermediate blank by a roughing mill group; 6) the intermediate blank is coiled and decoiled by a hot coiling box; 7) the head and the tail of the decoiled intermediate blank are cut and descaling by high pressure water is carried out to the decoiled intermediate blank; 8) the intermediate blank carries out finish rolling into a steel strip with standard thickness; 9) the steel strip is coiled into a finished steel coil by laminar flow cooling. The method is characterized by stable production technique, shorter production line, low equipment investment and high utilization rate of energy in the whole production process, etc.

The invention relates to a 2250 hot continuous rolling producing method for improving surface quality of steel for an automobile outer plate. The method includes conducting smelting to obtain molten steel, casting the molten steel into a cast plate blank through a continuous casting machine, arranging the obtained continuous cast plate blank into a heating furnace to be heated, conducting descaling on the plate blank through a primary descaling box after the plate blank is discharged from the furnace, utilizing a width fixing press to adjust the width of the plate blank after the plate blank is descaled, conducting rolling on the plate blank through a coarse rolling machine, conducting descaling on the middle plate blank obtained through the coarse rolling through a secondary descaling box, rolling the plate blank through a finish rolling machine after the plate blank is subjected to secondary descaling, cooling the plate blank through a laminar cooling system after the plate blank is subjected to the coarse rolling and the finish rolling and finally conducting coiling on the plate blank through a coiling machine. By optimizing a heating process, primary sinter generation quantity is reduced, the rolling process is optimized, the descaling effect is improved, secondary and tertiary sinter generation quantity is reduced, and pressure oxygen generation probability is further reduced.

The invention discloses an emulsified liquid total flow setting method during cold rolling of a double-rack six-roller mill. On the basis of a large number of field tests and theoretical researches, giving consideration to equipment characteristics of the double-rack six-roller mill and process characteristics of high-stage automobile sheet rolling, an emulsified liquid total flow optimization setting technology suitable for the high-stage automobile sheet cold rolling process of the double-rack six-roller mill is provided on the basis that sheet shape, surface quality and rolling stability comprehensive control indicators are introduced; three functions of improving the sheet shape quality of finished strip steel to the maximum degree, reducing the occurrence probability of hot slip damage to improve the product surface quality and avoiding slip to the maximum degree so as to improve the rolling stability can be achieved through the technology.

The invention discloses a finishing rolling unit in ESP endless rolling and a rolling method, and belongs to the field of steel and iron material engineering. The finishing rolling unit in the ESP endless rolling of the invention comprises a plurality of finishing mills arranged in the order of a finishing rolling process, and is characterized in that one of the finishing mills is a standby finishing mill for replacing the worn finishing mill; a spray header is arranged in front of the preceding finishing mill in the standby finishing mill and the worn finishing mill by the order; and the spray header spray cold water to cool a strip plate to complete the transformation process of austenite to ferrite. According to the invention, the full-continuous non-stop flexible rolling technology canbe realized, the productivity drop caused by the forced stop of the production line due to the downtime and roll change of the finishing rolling unit is avoided, and the output is also improved; andthe roll temperature rise can be reduced, so that the fatigue cracking and fracturing of the roll due to the thermal stress are reduced, the wear of the roll is reduced, the surface quality of endlessrolled products is improved, and the production cost is significantly lowered.

The invention relates to the technical field of steel rolling processes and discloses a method for lubricating and cooling a finish rolling slide guide plate. The method comprises the following steps of: arranging hot rolling oil collecting tubes on an upper edge of the finish rolling side guide plate of a lower rack of a finishing mill, wherein the distribution direction of the hot rolling oil collecting tubes is parallel to the side guide plate; and arranging a plurality of hot rolling oil nozzles on each of the hot rolling oil collecting tubes so that the spray range of hot rolling oil can cover the whole side guide plate of a guide ruler, wherein the included angle between the hot rolling oil nozzles and the side guide plate is 15 to 30 DEG, and simultaneously the hot rolling oil nozzles cannot exceed a lower end face of the upper edge of the side guide plate. Compared with the prior art, the method for lubricating and cooling the finish rolling slide guide plate has the advantages of effectively lubricating and cooling the finish rolling side guide plate of the lower rack, obviously reducing the abrasion and wear of the side guide plate, prolonging the service life of the side guide plate by two times, obviously reducing disadvantages of splits and scars on edges of steel bands, and obviously improving the surface quality of products.

The invention discloses a lubrication system for hot rolling of a vertical roller mill plate blank. The lubrication system comprises an oil supply part, a water supply part, a mixing control part, a spraying collecting pipe device, a gas source supply part and an oil supplementation device, wherein the mixing control part is connected with the spraying collecting pipe device; a centrifugal water pump of the water supply part pumps water into a mixer of the mixing control part; a metering pump of the oil supply part pumps oil in an oil storage tank to the mixer of the mixing control part; the oil supplementation device is used for supplementing lubricating oil to the oil storage tank; the gas source supply part supplies gas sources for the spraying collecting pipe device. Oil and water are mixed into mechanical mixing liquid according to a certain ratio, the mechanical mixing liquid is uniformly sprayed to a vertical roll surface through a nozzle so as to achieve the effect of lubrication; an oil supply system and a water supply system are respectively supercharged, filtered and metered and are mixed through a control valve stand containing the mixer to obtain oil-water mechanical mixing liquid, and the oil-water mechanical mixing liquid is sprayed to the vertical roll surface for lubrication through a spraying pipeline.

The invention discloses a preparation method of 310S stainless steel and the 310S stainless steel. The 310S stainless steel is prepared from the following components in percent by mass: 0.03-0.06% ofC, 0.40-0.70% of Si, 1.30-1.60% of Mn, less than or equal to 0.025% of P, less than or equal to 0.0010% of S, 25.30-25.90% of Cr, 19.00-19.80% of Ni, 0-0.5% of Mo, 0.02-0.05% of N, 0-0.5% of Cu, 0-0.1200% of Al and the balance Fe. The preparation method comprises the following steps: smelting; continuous casting; hot rolling; annealing and pickling. The preparation method has the beneficial effects that the oxygen content of plain steel is reduced effectively by controlling the oxygen content precisely, so that the surface quality of a product is enhanced; surface scales are easy to clean, andthe 310S stainless steel has excellent heat resistance and is suitable for a severe high-temperature environment.

The invention discloses a hot-pressing air-blowing forming method of a decoration member of automobile trunk. The method is characterized in that a first layer of wood powder plate is heated in a baking oven to a high elastic state for keeping constant temperature, the holes are made on the first layer of the wood powder plate, then a second layer of wood powder plate which is heated to the high elastic state is laid on the first layer wood powder plate, non-woven fabrics are respectively laid on a lower die and an upper die of a relative die of the first layer wood powder plate and the second layer wood powder plate, the matched die stitches the first layer wood powder plate, the second layer wood powder plate and two layers of non-woven fabrics, high pressure gas is employed for carrying out high pressure gas blowing between the first layer wood powder plate and the second layer wood powder plate, a honeycomb structure is formed by bonding the first layer wood powder plate, the second layer wood powder plate and two layers of non-woven fabrics, then processes of keeping pressure, cooling and moulding are performed. The invention has the advantages of comprehensively raising the integral performance of the product, raising surface quality of the product and raising the product quality.

The invention discloses a production method of high-strength steel. Steel components are designed. Specifically, the element Si is added for strengthening, after heating, an anchor pinning shape appears on an adding interface, FeO wraps Fe2SiO4 to be immersed into a steel matrix, the maximum pinning depth can reach 50 micrometers, the adhesive power of an inner iron sheet is good, and matrix falling off is not prone to happening. Cr and Mo are also added, and the shape of the net-shaped iron sheet with the Si content being reduced is weakened. Due to adding of the element Mo, a Mo element enrichment zone exists on the matrix interface. The element Mo hardly participates in forming of inner oxidization mass points, and the function of closing the oxidization interface is achieved. Through adding of the element P, the removal force of the iron sheet can be obviously improved. P is included in a Fe-Si-O system, the melting point of oxide of the system can be reduced, and therefore after the element P is added, the removal force of the iron sheet can be obviously improved, and the adhesive force of the iron sheet is reduced. By means of the production method, the technical problem of the color difference defect is solved, the occurrence rate of the color difference defect of a cold rolled plate can be effectively reduced, and therefore the product surface quality is improved.

The invention discloses a technology for eliminating withdrawing and straightening lines on the surface of galvanized door plate steel. The technology comprises the steps of pickling, rolling, cover type annealing, flattening and galvanizing. The selected galvanized door plate steel comprises 0.01 wt% or less of C, 0.04 wt% or less of Si, 0.15-0.25 wt% of Mn, 0.02 wt% or less of P, 0.015 wt% or less of S, 0.015-0.055 wt% of Al, 0.004 wt% or less of N, and 0.001-0.002 wt% of B. The galvanizing is carried out after the rolling in a general technology for the galvanized door plate steel, the route of technology in the invention is afresh designed and is characterized in that trip steel does not enter the galvanizing line, enters a cover type annealing furnace and is completely annealed, so the defect of incomplete annealing of the strip steel in a galvanizing and continuous annealing furnace is avoided, and complete annealing realizes the elimination of the residual stress in the strip steel and thorough removal of the yield point elongation from the strip steel, thereby withdrawing and straightening line defects on the surface of the strip steel are improved and removed after the galvanizing.

The invention discloses a workpiece surface vacuum defoaming method which comprises the specific steps: (1) putting a workpiece in a vacuum chamber, and connecting the vacuum chamber with a vacuum pump and a high-pressure air injection spray head; (2) opening the vacuum pump to vacuumize, and closing the vacuum pump when the vacuum degree in the vacuum chamber reaches the closing set value; (3) opening the high-pressure air inject spray head to enable high-pressure air to enter the vacuum chamber quickly, breaking bubbles on the surface of the workpiece due to quick change of internal and external pressure difference, meanwhile, enabling the pressure of quickly injected high-pressure air to act on the surfaces of the bubbles to blow the bubbles broken, and closing the high-pressure air injecting spray head when the vacuum degree in the vacuum chamber reaches the opening set value; (4) repeating the step (2) and the step (3) till the bubbles on a colloid on the surface of the workpiece are removed to achieve the vacuum defoaming of the workpiece. The method has the advantages that the product surface quality is improved, and the workpiece sealing effect is ensured.

The invention belongs to a torquer magnetic steel assembly device and method. Firstly, an excitation ring is placed in a base, after the lower end face of magnetic steel is coated with a binder, the magnetic steel is placed in an upper cover, the upper cover is mounted on the base, a protruding locating column of the upper cover cooperates with the inner wall of the base, and accurate locating of the magnetic steel in the excitation ring is ensured; and the upper cover and the base are in fastened connection through fastening screws, then a torque screwdriver is adopted for screwing down a force application screw, when the tightening torque exceeds a set value, pressure is not applied to the magnetic steel any more, and it is ensured that the stress of the magnetic steel is consistent. The torquer magnetic steel assembly device and method have the beneficial effects that the pressing force of the magnetic steel can be consistent, the binding quality of the magnetic steel and the binding quality of the excitation ring are consistent, and therefore the assembly quality is improved; the magnetic steel fall-off proportion of an existing assembly method is reduced, the percent of pass of parts is improved, and the production cost is reduced; and the inner side wall of the excitation ring is not damaged under the condition of ensuring magnetic steel accurate locating, and the product surface quality is improved.

The invention discloses a method for manufacturing a die for casting, comprising the step of forming at least one TiBN layer on the surface of hot die steel after pretreatment by PVD (physical vapor deposition), wherein the pretreatment comprises degreasing and cleaning in order, and degassing and drying are carried out in a vacuum degassing box after cleaning, the degassing and drying is carried out at 100-200 DEG C, the vacuum degassing box is vacuumized at 5-10 Pa, and the degassing time is 30-60 minutes. The bonding force between the obtained coating and a base material is greatly improved, and die surface erosion is retarded, thereby improving the product surface quality and die service life.

The invention provides a wafer cleaning apparatus and a wafer cleaning method. The apparatus comprises a conveyor belt, wherein a first cleaning zone, an overturning zone and a second cleaning zone are successively disposed in the conveying direction of the conveyor belt; in the first cleaning zone, a first nozzle for spraying a cleaning liquid onto the first surface of a wafer on the conveyor belt is disposed above the conveyor belt; in the second cleaning zone, a second nozzle for spraying a cleanser onto the second surface, opposite to the first surface, of the wafer is disposed above the conveyor belt; and in the overturning zone, an overturning mechanism for overturning the wafer is disposed. The wafer cleaning apparatus sprays the cleaning liquid onto the surfaces of the wafer by the nozzles instead of a traditional mechanical cleaning method, reduces the scratches on the surfaces of the wafer, improves the surface quality of a product, changes a traditional batch cleaning modeto a single wafer cleaning mode, shortens the standby time of the cleaning project, shortens the cycle, improves productivity, and improves cleaning force, quality and productivity by double-sided cleaning.

A disclosed outer charging type material-storage cylinder die head comprises a material-storage cylinder barrel, and an outer core rod, a material press ring and an adjusting shaft all arranged in the material-storage cylinder barrel; one end of the material-storage cylinder barrel is provided with an end cover, and the other end is connected with a die material inlet; the adjusting shaft is arranged at a middle shaft inside the material-storage cylinder barrel; the outer core rod is arranged between the material press ring and the material-storage cylinder barrel; a material inlet hole of the material-storage cylinder barrel is connected with the outer core rod, and a flow channel on the outer core rod is communicated with the interior of the material-storage cylinder barrel; and gaps are reserved between the material press ring and the outer core rod, and between the material press ring and the adjusting shaft.

The invention discloses a vacuum defoaming method for the surface of a workpiece. The vacuum defoaming method includes the specific steps that 1, the workpiece is placed in a vacuum cavity, and the vacuum cavity is connected with a vacuum pump and a high-pressure air injection spray nozzle; 2, the vacuum pump is started to conduct vacuuming, and the vacuum pump is closed after the vacuum pump conducts vacuuming for a set time; 3, the high-pressure air injection spray nozzle is started, and high-pressure air enters the vacuum pump rapidly; bubbles on the surface of the workpiece are broken due to quick changes of the internal and external pressure difference, and meanwhile the pressure of the fast-injected high-pressure air acts on the surfaces of the bubbles so that the bubbles are broken in a blowing manner; and the high-pressure air injection spray nozzle is closed after the air-intake time of the high-pressure air injection spray nozzle reaches the set value; and 4, the step 2 and step 3 are repeated till the bubbles on the surface colloid of the workpiece are removed, and vacuum defoaming of the workpiece is achieved. By means of the vacuum defoaming method, product surface quality can be improved, and the sealing effect of the workpiece is guaranteed.

The invention discloses an automatic thread rolling machine. The automatic thread rolling machine comprises a feeding mechanism, a lubricating mechanism, a thread rolling mechanism, a cutting fluid recovery mechanism and a working frame; the feeding mechanism comprises a feeding frame, an automatic feeding wheel set, a feeding rail and traction rollers; the lubricating mechanism is arranged between the traction rollers and the feeding rail, wherein the lubricating mechanism comprises a body and an oil injection port, a channel for allowing a workpiece to pass is formed inside the body, the oilinjection port communicates with the channel, and lubricating oil enters the channel through the oil injection port and is attached to the workpiece; the thread rolling mechanism comprises two wire rolling wheels and a cooling liquid jetting mechanism, and the cooling liquid jetting mechanism comprises a jetting head and a cooling liquid storage box; the cutting fluid recovery mechanism comprisesa shell, an air outlet part, a fan and a backflow pipeline, wherein a through hole allowing the workpiece to pass is formed inside the shell, the bottom of the through hole communicates with the backflow pipeline, and the backflow pipeline leads to the cooling liquid storage tank; and the working frame is used for bearing the mechanisms. According to the automatic thread rolling machine, high-efficiency, high-quality and low-cost thread rolling machining is realized, and the sustainable development direction is provided.

The invention discloses a punching and welding integrated clamping device. The device comprises a mounting base, a clamping mechanism and a punching mechanism, wherein a mounting area used for a door frame outer plate of a cab side wall to be mounted is formed on the upper end face of the mounting base; the clamping mechanism comprises a plurality of clamps, and the clamps are distributed in the circumferential direction of the mounting area and used for fixing the door frame outer plate of the cab side wall into the mounting area; and the punching mechanism comprises a punching tool located above the mounting area and a driving device, the punching tool is arranged outside the mounting area in a vertical and horizontal translation mode, the driving device is in driving connection with the punching tool so as to drive the punching tool to move to the position over the mounting area in the horizontal direction and then move downwards to be close to the mounting area, and mounting holes are punched in the door frame outer plate of the cab side wall. Limited space and fixed stroke movement are achieved, space occupation and die space occupation are reduced, the workpiece tailor-welding precision is improved, the product surface quality is improved, the first-pass yield is increased, the manual operation amount is reduced, the production line safety is improved, and the production line flexibility is met.

The invention provides a method for preparing high-purity niobium wire for nuclear fuel using niobium bars for general industrial use as raw materials, which includes the following steps: 1. Electron beam melting of niobium bars for general industrial use to obtain ingots; 2. Turning processing; 3. Extrusion, to obtain the extruded bar blank; 4. Carry out the first stage annealing treatment after turning; 5. Rotating, to obtain the swaged bar blank; 6. Carry out the second stage annealing treatment, and then perform surface sanding to obtain Sanding the rod blank; 7. Roller die stretching to obtain a rough wire material; 8. After surface treatment, perform fixed mold stretching and shaping to obtain semi-finished wire material; 9. After surface treatment, straighten to obtain a diameter of 1.5mm~ 3.0mm, high purity niobium wire for nuclear fuel with straightness <3mm / m. The invention has fewer heat treatment fires, less hot processing, and a high yield. The size, surface inspection, and composition of the high-purity niobium wire prepared by this method all meet the requirements for nuclear-grade materials, and can be directly used for the preparation of uranium-niobium alloys for nuclear fuel.

The invention discloses a cold rolled strip steel production technology. The cold rolled strip steel production technology comprises the following steps: uncoiling the strip steel by an uncoiler, allowing the uncoiled strip steel to pass through a welder, feeding to an entry looper of a rolling mill, entering a entry tension unit of the rolling mill, entering a cold continuous rolling unit, conveying the cold rolled strip steel to a flying shear unit, and then using a recoiling machine to recoil the strip steel. The cold rolled strip steel production technology is characterized in that before entering the cold continuous rolling unit, the strip steel is firstly heated by a strip steel heating device, wherein strip steel temperature detectors are arranged at the inlet and the outlet of the strip steel heating device, and used to detect the strip steel temperature at the inlet and the outlet of the strip steel heating device, in order to control heating of the strip steel, enable the strip steel temperature at the outlet of the strip steel heating device to be close to or up to the strip steel targeted temperature before the strip steel enters the rolling mill, so as to meet the required strip steel temperature at the rolling mill inlet. The cold rolled strip steel production technology disclosed by the invention can reduce influence degree of the strip steel temperature to internal friction state of cleaning between the rolls, and improves the lubricating performance in the rolling process, so as to reduce strip steel surface tear defect and rolling mill vibration due to poor lubricating performance.

The invention discloses a detection locating plate for feeding of a precision part and a detection method thereof, and relates to the technical field of stamping molds. The detection locating plate comprises a mounting seat and a locating plate main body, and is further provided with a sensor used for sensing the change of the position of a detection block, wherein the locating plate main body is of an L-shaped structure; the locating plate main body comprises a horizontally arranged bottom plate and a vertically arranged vertical plate; a locating groove which penetrates through the top end and the bottom end of the vertical plate is formed in the middle part of the vertical plate in the length direction of the bottom plate; the locating groove divides the vertical plate into two parts; the detection block is arranged in the locating groove; the bottom end of the detection block is movably mounted in the locating groove through a hinge pin; a mounting groove is formed in the top surface of the mounting seat; and the bottom plate is fixedly mounted in the mounting groove. According to the detection locating plate, surface quality of stamping part products is improved, and mold design and development difficulty is reduced.

The invention discloses a supersonic spray process for a shaped roll pass made of semisteel, which comprises the following steps: 1) carrying out pretreatment on the working surface of the roll pass; 2) carrying out shot blasting on the working surface of the roll pass; 3) carrying out supersonic spray on the working surface of the roll pass; and 4) carrying out hole sealing treatment on a coating. The supersonic spray process disclosed by the invention has the advantages that 1, by using a JP5000-type supersound flame spraying system, the flying speed of melting powder is greater than 720 m / s, the property of the coating is excellent, and the surface of the coating is dense, so that the surface quality of products is greatly improved; 2, the tungsten carbide metal composite powder coating is good in wear resistance and heat resistance, so that for insufficiently cooled shaped lower rolls, the steel bonding caused by frictional wear and the roll marks caused by adhesive wear are avoided, thereby reducing the accident loss due to poor quality; and 3, the wear resistance of the roll pass is increased, the steel passing quantity of the roll pass is increased, the roll loss is reduced, and the service life of a semi-steel shaped roll is prolonged.

The invention discloses an automatic conveying belt cleaning device which comprises a conveying belt, oil wiping rollers and a cylinder. The cylinder is connected with the oil wiping rollers through a control rod. An oil stain sensor is arranged on the conveying belt. The cylinder and the oil stain sensor are connected with a controller. By means of the oil wiping rollers, damage to the conveying belt can be substantially reduced, and meanwhile, oil stains on the surface layer of the conveying belt are deeply cleaned away. According to the automatic conveying belt cleaning device, full-automatic detection of operation and stopping can be achieved, and the oil wiping rollers are embedded in a movable buckling mode so that the oil wiping rollers can be quickly replaced. Meanwhile, the setting of automatic cleaning is adopted, and routine automatic cleaning is carried out to guarantee that the oil amount on the conveying belt is the lowest in the whole course. The automatic conveying belt cleaning device is a universal type cleaning device and can be widely applied to various production lines for longitudinal cutting, horizontal cutting, blanking and the like, a large quantity of manpower is saved, and potential safety hazards are reduced; the downtime is shortened, the product surface quality is improved, and the production efficiency and the client satisfaction are indirectly improved.

The invention discloses a gapless extrusion method for an aluminum alloy seamless tube. An inlet segment of a liner of an extrusion barrel in the extrusion method is processed into a cone-shaped flaring, and the inner diameter of an extrusion segment from a flaring segment is slightly smaller than the outer diameter of an extrusion ingot. The innovative point of the invention is primarily adoptingan extrusion ingot blank, the outer diameter of which is slightly smaller than the inner diameter of the liner of the extrusion barrel. In order to push the extrusion ingot into the extrusion barrelsmoothly, the inlet end of the liner of the extrusion barrel is processed into a cone-shaped horn mouth. When extrusion is started, a certain pressure is applied by an extrusion bar and an extrusion pad to push the heated extrusion ingot blank from a cone-shaped inlet to the extrusion barrel till the bottom. As the outer diameter of the extrusion ingot blank is slightly greater than the inner diameter of the extrusion barrel, the ingot blank deforms plastically to a certain extent in the pushed process and extrude all air in the extrusion barrel, and the extrusion barrel is filled fully without any gaps. Therefore, threading and extrusion forming are carried out directly without upset-extruding thereafter.

The invention discloses an unwinding machine of a strip pickling line, which comprises a machine base, a first bearing seat, a second bearing seat, a main shaft, a braking device, a four segment type mandrel and an end sleeve, wherein the first bearing seat and the second bearing seat are fixed on the machine base, the first bearing seat and the four segment type mandrel are adjacent, the main shaft is set to be a hollow shaft, a pull rod which can carry out reciprocating motion along the shaft line of the main shaft is arranged in the main shaft, one end of the pull rod is connected with a piston rod of an oil cylinder of a hydraulic system connected with the strip pickling line, and the other end of the pull rod is connected with the end sleeve. The unwinding machine of the strip pickling line adopting the structure is convenient to operate and can reduce the labor intensity, improve the production efficiency, eliminate the potential safety problems, reduce the maintenance workload,reduce the maintenance cost and improve the surface quality of a product.