CN110216424B

CN110216424B - Box welding production line and production method

Info

Publication number: CN110216424B
Application number: CN201910508558.3A
Authority: CN
Inventors: 杨勇; 原雪燕; 韩力; 冷雪峰; 张英波; 孙新虎
Original assignee: Yantai Casi Kaite Metal Products Co ltd
Current assignee: Yantai caskat metal products Co.,Ltd.
Priority date: 2019-06-13
Filing date: 2019-06-13
Publication date: 2020-06-19
Anticipated expiration: 2039-06-13
Also published as: CN110216424A

Abstract

The invention discloses a box body welding production line and a production method. The production line comprises a plate discharging and hole opening equipment line, a rolling forming line, a punching device, a bending device and a welding device; the plate discharging and punching equipment line is used for leveling steel and punching on the surface of the steel to manufacture a material plate; the roll forming line is used for rolling a bent edge on the material plate; the punching device is used for cutting the material plates into a plurality of groups, and each group of material plates comprises four continuous sections which respectively correspond to four side wall plates of the box body; the bending device is used for bending the cut material plate into a side wall frame of the box body; the welding device is used for welding the frame into an integrated box body. The full-automatic production line and the full-automatic production process of punching, rolling, cutting, bending and welding are adopted, full-automatic forming from the steel plate to the box body is realized, the processing of the hole and the three-dimensional characteristic on the side wall of the box body is completed at one time, the production efficiency is high, the labor cost is low, and the processing quality is high.

Description

Box welding production line and production method

Technical Field

The invention relates to a box welding production line and a box welding production method.

Background

The processing of a metal box (such as a metal coffin) generally comprises the working procedures of blanking, perforating, splicing, welding and the like.

At present, the main procedures in the processing of the metal box body all depend on manual work. The operator need follow the coiled material and go up unloading, then carry out size measurement, decide, put and accomplish operations such as trompil on the hydraulic piercing press again, then assemble the completion respectively with lateral wall flitch all around through the welding mode earlier, assemble the lateral wall flitch all around together through the welding mode again. The disadvantages of this approach are: (1) the workload is large, the labor cost is high, and the processing quality is difficult to ensure; (2) the side wall plate has a complex shape and a plurality of folded edge structures, different sectional materials need to be processed firstly, and then welding and assembling of the side wall part on one side are carried out, so that the processing difficulty is high, and the cost is high; (3) when the peripheral side walls are welded together, the positioning accuracy between the side walls is difficult to ensure, the operation is complex, the efficiency is low, spot welding is carried out in advance in time, and the deformation of the box body when the box body is stressed cannot be avoided, so that the final welding quality is influenced; (4) the box body needs to be moved continuously during welding, and the efficiency is low.

Disclosure of Invention

The invention provides a box body welding production line and a production method, and aims to provide the following steps: the production cost is reduced, and the processing quality is improved.

The technical scheme of the invention is as follows:

a box welding production line comprises a plate discharging and hole opening equipment line, a rolling and forming line, a punching device, a bending device and a welding device;

the plate discharging and punching equipment line is used for leveling steel and punching on the surface of the steel to manufacture a material plate;

the roll forming line is used for rolling a bent edge on the material plate;

the punching device is used for cutting the material plates into a plurality of groups, and each group of material plates comprises four continuous sections which respectively correspond to four side wall plates of the box body;

the bending device is used for bending the cut material plate into a side wall frame of the box body;

the welding device is used for welding the frame into an integrated box body.

As a further improvement of the production line: the plate discharging and hole opening equipment line comprises an uncoiler, a leveler, a feeder and a punching machine which are sequentially arranged;

the uncoiler is used for placing coiled steel and conveying the steel to the leveler in a rotating mode;

the leveler is used for leveling steel; the leveling machine is provided with a leveling area, the leveling area comprises a plurality of upper leveling rollers horizontally arranged and a plurality of lower leveling rollers horizontally arranged below the upper leveling rollers, and the leveling machine is also provided with a pinch roller assembly for driving steel to move; the leveling machine is also provided with a guide roller assembly, and the guide roller assembly is used for restraining the position of steel;

the feeder is used for feeding the leveled steel into the punching machine;

the punching machine is provided with a hydraulic press, a hole forming die is mounted on the hydraulic press, and the hole forming die comprises an upper die moving up and down and a lower die fixedly arranged below the upper die.

As a further improvement of the production line: the uncoiler comprises a first rack and a rotatable main shaft horizontally arranged on the first rack, a plurality of groups of arc-shaped material bearing blocks which are circumferentially distributed are arranged on the main shaft through connecting rods, and coiled steel is arranged on the material bearing blocks; the uncoiler also comprises an uncoiling driving device for driving the main shaft to rotate and an uncoiling control device for controlling the main shaft to rotate;

a discharging buffer area is arranged between the uncoiler and the leveler, and a first pressure sensing device is arranged on the ground of the discharging buffer area; the first pressure sensing device is connected with the uncoiling control device.

As a further improvement of the production line: the leveling machine comprises a second machine frame, a leveling lower roller is installed on the second machine frame, a moving plate is further arranged in a leveling area, the moving plate is connected with the second machine frame in a sliding mode so as to achieve up-down movement relative to the second machine frame, and the leveling upper roller is installed on the moving plate; the leveling machine is also provided with a leveling gap adjusting mechanism for adjusting a gap between the leveling upper roller and the leveling lower roller;

the leveling gap adjusting mechanism comprises a leveling limiting mechanism and a resetting mechanism; the leveling limiting mechanisms are arranged at the front end and the rear end of the movable plate respectively and used for limiting the limit position of the movable plate moving upwards, and the reset mechanism is arranged on the second rack and used for pushing the movable plate to move upwards;

the leveling limiting mechanism comprises a second screw rod; the second screw rod is vertically arranged and matched with a threaded hole formed in the top of the second rack, and the lower end of the second screw rod is in contact with the top of the moving plate;

the reset mechanism is a reset spring, the bottom of the reset spring is in contact with the second rack, and the top of the reset spring is in contact with the moving plate.

As a further improvement of the production line: the pinch roll assembly comprises an upper pinch roll and a lower pinch roll which are horizontally arranged; the lower pinch roll is a driving roll and is arranged on a second rack of the leveler; the upper pinch roll is arranged on a sliding seat, and the sliding seat is in sliding fit with the second rack so as to move up and down relative to the second rack;

the second frame is also provided with a pinch pressing mechanism for pressing the upper pinch roll downwards;

the clamping and conveying pressing mechanism comprises a first lead screw and a cylindrical spring, a vertical guide groove is formed in the second rack, a threaded hole matched with the first lead screw is formed in the top of the guide groove, the cylindrical spring is arranged in the guide groove, the upper end of the cylindrical spring is connected with the lower end of the first lead screw, and the lower end of the cylindrical spring is connected with the sliding seat.

As a further improvement of the production line: the roll forming line comprises a lathe bed and a plurality of roll units which are sequentially arranged along the length direction of the lathe bed; the rolling unit comprises two groups of vertical frames which are oppositely arranged left and right, and also comprises an upper rotating pressing roller and a lower rotating pressing roller which are complementary in shape, two ends of the rotating pressing roller are respectively and rotatably connected with the left vertical frame and the right vertical frame, and a gap for a material plate to pass through is arranged between the upper rotating pressing roller and the lower rotating pressing roller;

the roll forming line also comprises coupling devices which correspond to the roll units one by one and roll driving devices which are used for providing rotary power for the roll units; the coupling device is provided with an output shaft in the left-right direction, and the output shaft is connected with the lower rotary pressing roller of the corresponding rolling unit; the front end and the rear end of the coupling device are respectively provided with a transmission shaft in the front-back direction, the transmission shafts of the adjacent coupling devices are connected through a coupling, and the rolling driving device is connected with the input shaft of at least one coupling device so as to realize the synchronous driving of the rolling units;

the vertical frame is provided with a vertical sliding groove, a sliding plate which moves up and down along the vertical groove is installed in the sliding groove, and the end part of the upper rotating compression roller is rotatably connected with the sliding plate on the corresponding side;

the top of the sliding plate is further connected with a vertical screw rod, the screw rod penetrates through a through hole in the top of the vertical frame, and a positioning nut is further mounted on the screw rod and located above the vertical frame.

As a further improvement of the production line: the device also comprises a conveying device, a bending device and a cutting device, wherein the conveying device is used for conveying the cut material plates into the bending device and controlling the positions of the material plates in the bending device;

the conveying device comprises a belt conveyor, and the belt conveyor is used for conveying the material plates to the bending device;

the conveying device further comprises a pushing mechanism, and the pushing mechanism is used for pushing the material plate to a fixed position on the bending device;

the pushing mechanism comprises a first pushing mechanism positioned at the discharging end of the belt conveyor, the first pushing mechanism comprises a fifth rack and a pushing cylinder horizontally mounted on the fifth rack, a telescopic rod of the pushing cylinder faces the bending device, a vertical pushing block matched with the opening on the material plate is mounted at the tail end of the telescopic rod, the upper end of the pushing block is rotatably connected with the tail end of the telescopic rod to realize pitching rotation relative to the pushing cylinder, and an inclined plane is arranged on the rear side of the lower end of the pushing block; the tail end of the telescopic rod of the pushing cylinder is also provided with a limiting surface for limiting the push block to only rotate towards the bending device, and the push block is contacted with the limiting surface when the push block rotates downwards to a vertical position;

the pushing mechanism comprises a second pushing mechanism positioned between the first pushing mechanism and the bending device; the second pushing mechanism comprises a sixth rack and a lead screw horizontally arranged on the sixth rack, and the sixth rack is also provided with a driving motor for driving the lead screw to rotate and a guide rail parallel to the lead screw; the second pushing mechanism further comprises a sliding seat in sliding fit with the guide rail, a nut device matched with the lead screw is mounted on the sliding seat, a through groove which is arranged on the sliding seat and runs along the front direction and the back direction and through which the feeding plate penetrates is formed in the sliding seat, a pushing clamping cylinder located above the through groove is further arranged on the sliding seat, a telescopic rod of the pushing clamping cylinder is arranged downwards, a pressing plate is mounted at the tail end of the telescopic rod, and the pressing plate is used for clamping the material plate together with the bottom plate of the sliding seat.

As a further improvement of the production line: the bending device comprises a seventh rack, and a first bending area, a positioning area and a second bending area are sequentially arranged on the seventh rack along the advancing direction of the material plate; a clamping cylinder which is positioned in the positioning area and used for fixing the material plate is arranged on the seventh rack; the two groups of bending areas are respectively provided with a group of bending deflection mechanisms; a position switch is also arranged on the seventh rack;

the bending displacement mechanism comprises a bending action cylinder and a bending plate, one end of the bending action cylinder is rotatably connected with the seventh rack, the other end of the bending action cylinder is rotatably connected with the bending plate, and one end, close to the positioning area, of the bending plate is connected with the seventh rack in a rotating connection mode.

As a further improvement of the production line: the welding device comprises a first machine body and a second machine body which are oppositely arranged at the left and right sides, and further comprises an overturning frame body arranged between the first machine body and the second machine body;

the left end and the right end of the turnover frame body are respectively connected with a rotating shaft on the first machine body and a rotating shaft on the second machine body so as to realize turnover between the two machine bodies;

the turnover frame body is used for mounting a box body to be welded, and a clamping mechanism for clamping and positioning the box body is arranged on the turnover frame body;

the box body is a rectangular frame body and comprises two groups of long side plates arranged oppositely and two groups of short side plates arranged oppositely;

the turnover frame body is provided with a positioning surface which is contacted with the bottom surface of the box body; the clamping mechanism comprises two groups of short side plate clamping cylinders which are oppositely arranged left and right, a supporting seat which is used for being contacted with a long side plate on one side of the box body, a long side plate clamping cylinder which is used for pressing the long side plate on the other side of the box body, and an upper clamping cylinder and a lower clamping cylinder which are used for pressing the top surface of the box body;

the turnover box body is provided with a middle frame body positioned in a space surrounded by the box bodies to be welded, the cylinder bodies of the upper clamping cylinder and the lower clamping cylinder are arranged on the middle frame body, the extension rods of the upper clamping cylinder and the lower clamping cylinder are provided with pressing plates, and the pressing plates are used for pressing the top surface of the box body;

the middle frame body is also provided with a vertex angle clamping cylinder, and the vertex angle clamping cylinder is positioned at the inner side of the box body to be welded and positioned at the inner angle of the box body; the top corner clamping cylinder has an inclination angle relative to a side plate of the box body, a positioning block is mounted at the tail end of a projecting rod of the top corner clamping cylinder, and the positioning block is in contact with the inner wall of a long side plate and the inner wall of a short side plate at the inner corner of the box body correspondingly;

the top angle clamping cylinder has an inclination angle of 45 degrees relative to a side plate of the box body;

the cross section of the positioning block is in an isosceles trapezoid shape; the first machine body is provided with a rotation driving device which is used for driving the turnover frame body to rotate through a rotating shaft;

the rotary driving device comprises a deflection cylinder, a rack and a gear; the cylinder body of the deflection cylinder is arranged on the first machine body, the rack is arranged on an extension rod of the deflection cylinder and is parallel to the deflection cylinder, the gear is connected with a rotating shaft on the first machine body, and the gear is meshed with the rack;

and the sides of the first machine body and the second machine body are also respectively provided with a welding robot.

The production method of the box welding production line comprises the following steps:

marking the side walls of four sides of the box body as a continuous A side, a continuous B side, a continuous C side and a continuous D side;

leveling steel by using a plate discharging and hole opening equipment line and punching holes on the surface of the steel to manufacture a continuous material plate; the punching hole is used for forming a folding line at the joint between the side walls and the three-dimensional characteristics on the side walls when the side walls are bent;

thirdly, a roll forming line is used for rolling a bent edge on the material plate;

cutting off the flitches into a plurality of groups by using a punching device, wherein each group of flitch comprises a continuous A surface, a B surface, a C surface and a D surface;

step five, bending the cut material plates into side wall frames of the box bodies by using a bending device;

and step six, welding the frame into an integrated box body by using a welding device.

Compared with the prior art, the invention has the following positive effects: the full-automatic production line and the full-automatic production process of punching, rolling, cutting, bending and welding are adopted, full-automatic forming from the steel plate to the box body is realized, the processing of the hole and the three-dimensional characteristic on the side wall of the box body is completed at one time, the production efficiency is high, the labor cost is low, and the processing quality is high.

Specifically, panel ejection of compact trompil equipment line: the continuous mechanical automatic operation of uncoiling, discharging, leveling, uniform feeding and plate opening can be realized, the processing efficiency can be improved, the workload of operators is reduced, the labor cost is reduced, and the processing quality is guaranteed; the leveler restrains the position of the steel through the guide roller assembly, so that the steel is prevented from deviating, and the processing quality of subsequent punching and other procedures is ensured; the device is provided with a discharging buffer area, whether the length of the steel in the area is enough to drop to the ground or not is detected through a first pressure sensing device, when the discharging speed of an uncoiler is lower than the leveling speed of a leveler, the first pressure sensing device sends a signal, and an uncoiling control device of the uncoiler improves the rotating speed after receiving the signal, so that the discharging speed of the uncoiler is matched with the speed of the leveler, and the production continuity is ensured; the pinch pressure of the pinch roll of the leveler can be adjusted through the first screw rod, so that not only can enough clamping force be ensured to realize steel conveying, but also the abrasion caused by overlarge pressure can be prevented; the upper leveling rollers are arranged on the movable plate, and the gap between the upper leveling roller and the lower leveling roller and the formed inclination angle can be adjusted through the front group of second lead screws and the rear group of second lead screws, so that the leveling quality is improved; the punching machine is provided with a plurality of groups of punching stations, and can independently complete the punching action without conflict.

Roll-forming line and die cutting apparatus: forming and processing all the side wall plates in a rolling forming mode, then cutting the plates into continuous side wall plates by using a punching device, and completing other punching procedures; in the roll-in forming line, the distance between the rotary press rollers can be freely adjusted, and the roll-in forming line can flexibly adapt to flitches with various thicknesses.

Conveying device and bending device: cooperate through two sets of pushing mechanism, a set of position switch and bending device, realize the cubic location of flitch and bend, can bend into the frame structure with the flitch fast, accurately, not only can reduce the processing cost of metal box lateral wall wallboard itself, make the position between the wallboard that links to each other fixed moreover, reduced the welded location degree of difficulty, reduced operating procedure, improve welding efficiency and product quality.

The welding device comprises: the turnover frame body is used for placing the box body, and the box body is fixed on the turnover frame body through the clamping mechanism, so that the box body is prevented from deforming in the welding process, the welding quality is ensured, the box body does not need to be moved manually, and the welding efficiency is improved; the positioning in the up-down, left-right and front-back directions is realized through the clamping cylinder, and the positioning is stable and reliable; the clamping cylinder and the pressing plate for up-and-down positioning are arranged on the middle frame body in the box body, so that the structure is compact, the space utilization rate is high, the pressing plate can simultaneously press the long side plates at two sides, and the positioning is reliable; the top corner clamping cylinder for fixing the box body from the inner corner is also arranged, so that the joint is ensured not to move during welding, the welding seam is ensured to be smooth, and the welding quality is further improved; the cross section of the positioning block is preferably in an isosceles trapezoid shape, the positioning block can be in contact with the inner walls of the two side plates at the inner corners, a certain gap can be ensured to be reserved between the positioning block and the joint, and welding operation is not affected; the air cylinder is adopted to drive the overturning and the shifting, so that the cost is low, the control is simple, and the shifting speed is high; and the welding robot is adopted to complete the welding, so that the quality and the efficiency of the welding seam are obviously improved.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic structural diagram of an uncoiler.

FIG. 3 is a schematic view of a leveler.

Fig. 4 is a partial schematic view of portion a of fig. 3.

Fig. 5 is a schematic view of the structure of the punching machine.

Fig. 6 is a schematic diagram of five punching stations on the punching machine.

Fig. 7 is a schematic view of a punched sheet portion being broken down.

Fig. 8 is a side view schematically showing the structure of the roll unit.

Fig. 9 is a schematic structural diagram of a material plate pressed by a set of rotary press rollers.

Fig. 10 is a schematic layout view of a plurality of groups of rotating press rolls, and in order to embody the shape of each group of press rolls, the shapes in the vertical planes are all rotated to be displayed in the same plane.

Fig. 11 is a schematic view of the cross-sectional change of the material plate during the gradual roll forming process.

Fig. 12 is a schematic view of the structure of the punching device.

Fig. 13 is a schematic diagram showing the shape change before and after die cutting of a material sheet, and the hatched portion and the portion between the adjacent A, D faces need to be die cut.

Fig. 14 is a schematic structural view of the conveying device and the bending device.

Fig. 15 is a partial schematic view of a portion B in fig. 14 for revealing the structure of the first pushing mechanism.

Fig. 16 is a partial schematic view of a portion C in fig. 14 for showing the structure of the second pushing mechanism.

Fig. 17 is a schematic structural view of the bending apparatus.

Fig. 18 is a schematic view of the shape change during bending of the flitch.

Fig. 19 is a schematic structural view of the welding apparatus.

Fig. 20 is a perspective view of the first body, the flip frame body, and the second body portion.

Fig. 21 is a perspective view of a welded case.

Detailed Description

The technical scheme of the invention is explained in detail in the following with the accompanying drawings:

referring to fig. 1, a box welding production line includes a roll forming line 900, a punching device 1000, a conveying device 1100, and a bending device 1200, which are sequentially disposed;

the roll forming line 900 is used for rolling a bent edge on the material plate 1500;

the punching device 1000 is used for cutting off the rolled material plate 1500;

the conveying device 1100 is configured to convey the cut material plate 1500 into the bending device 1200, and control a position of the material plate 1500 in the bending device 1200;

the bending device 1200 is used for bending the material plate 1500 into a side wall frame of the box body.

The concrete structure of each device and equipment is as follows:

the plate discharging and hole opening equipment line comprises an uncoiler 100, a leveler 200, a feeder 300 and a punching machine 400 which are sequentially arranged.

The uncoiler 100 is used for placing the rolled steel material 600 and conveying the steel material 600 to the leveler 200 in a rotating manner.

Specifically, as shown in fig. 2, the uncoiler 100 includes a first frame 101 and a rotatable main shaft 102 horizontally mounted on the first frame 101, a plurality of groups of arc-shaped material receiving blocks 104 distributed circumferentially are mounted on the main shaft 102 through connecting rods 103, and the coiled steel material 600 is mounted on the material receiving blocks 104; the uncoiler 100 further comprises an uncoiling driving device for driving the main shaft 102 to rotate and an uncoiling control device for controlling the main shaft 102 to rotate.

In this embodiment, the width of steel material 600: 650mm, thickness 1.0mm, inner diameter of coiled material: not less than ∅ 450mm, maximum outside diameter of coiled material: ∅ 1500 mm.

The size of the land occupied by the unwinder 100 (length x width) is: 1500x1000mm, weight bearing: 5T or less, the center height of the main shaft 102 is as follows: 750 mm. The first frame 101 is formed by welding section steel, and the main shaft 102 is formed by hardening and tempering 40Cr steel. The uncoiling driving device is a motor with the power of 2.2 Kw. The unwinder 100 also carries a brake for locking the spindle 102.

The support form of the uncoiler 100 is a hydraulic inner core tension type, namely: two ends of the connecting rod 103 are respectively rotatably connected with the material bearing block 104 and the main shaft 102, and the connecting rod 103 is driven to rotate by the pull rod and sliding sleeve mechanism, so that the material bearing block 104 can be driven to move along the radial direction, and tensioning is realized. The tensioning form is a common tensioning form of the uncoiler 100, and reference can be made to the technical solutions described in patents with the publication numbers CN201543679U and CN 102658984A.

As shown in fig. 1, 3 and 4, the leveler 200 is used to level a steel material 600.

The leveler 200 includes a second frame 201. The leveling machine 200 is provided with a leveling area, and the leveling area comprises five groups of upper leveling rollers 207 horizontally arranged and six groups of lower leveling rollers 208 horizontally arranged below the upper leveling rollers 207. The leveling roller is subjected to quenching and tempering and chromium plating treatment, and the mechanical properties such as rigidity, surface roughness and the like are greatly improved.

The leveler 200 is also provided with a pinch roll assembly 203 for driving the steel material 600 to move. In this embodiment, a set of pinch roll assemblies 203 are disposed on each of the front and rear sides of the leveling zone.

As shown in FIG. 4, the pinch roll assembly 203 comprises an upper pinch roll 203-1 and a lower pinch roll 203-2 which are both horizontally arranged; the lower pinch roll 203-2 is a driving roll and is arranged on a second rack 201 of the leveler 200; the upper pinch roll 203-1 is arranged on a sliding seat 203-3, and the sliding seat 203-3 is in sliding fit with the second rack 201 to realize up-and-down movement relative to the second rack 201; the second frame 201 is also provided with a pinch pressing mechanism 204 for pressing the upper pinch roller 203-1 downwards.

Further, the pinch pressing mechanism 204 comprises a first screw rod 204-1 and a cylindrical spring 204-3, a vertical guide groove is formed in the second frame 201, a threaded hole matched with the first screw rod 204-1 is formed in the top of the guide groove, the cylindrical spring 204-3 is arranged in the guide groove, the upper end of the cylindrical spring 204-3 is connected with the lower end of the first screw rod 204-1, and the lower end of the cylindrical spring 204-3 is connected with the sliding seat 203-3. The first screw 204-1 is provided with a first nut 204-2, the pressing force of the cylindrical spring 204-3 can be adjusted by rotating the first screw 204-1 through a handle, so that the adjustment of the clamping force is realized, the sufficient clamping force can be ensured to realize the conveying of the steel material 600, and the abrasion caused by the overlarge pressure can be prevented. After the first screw 204-1 is adjusted, the first screw 204-1 can be locked by the first nut 204-2, so that the position is prevented from being changed.

The upper leveling roller 207 of the leveler 200 has an integral structure, and the distance between the upper and lower rollers can be adjusted. The concrete structure is as follows: as shown in fig. 3 and 4, the lower leveling roller 208 is mounted on the second machine frame 201, the leveling area is further provided with a moving plate 206, the moving plate 206 is slidably connected with the second machine frame 201 to move up and down relative to the second machine frame 201, and the upper leveling roller 207 is mounted on the moving plate 206; the leveler 200 is further provided with a leveling gap adjusting mechanism for adjusting a gap between the upper leveling roller 207 and the lower leveling roller 208.

In this embodiment, the leveling gap adjusting mechanism includes a leveling limiting mechanism 205 and a resetting mechanism; the two sets of leveling limiting mechanisms 205 are respectively disposed at the front end and the rear end of the moving plate 206 and used for limiting the limit position of the moving plate 206 moving upward, and the reset mechanism is mounted on the second frame 201 and used for pushing the moving plate 206 upward to move to the limit position. Specifically, the leveling limiting mechanism 205 comprises a second screw rod 205-1; the second screw rod 205-1 is vertically arranged and matched with a threaded hole formed in the top of the second rack 201, the lower end of the second screw rod 205-1 is in contact with the top of the moving plate 206, a handle is arranged at the upper end of the second screw rod 205-1, a second nut 205-2 is further arranged on the second screw rod 205-1, and the second screw rod 205-1 can be locked through the second nut 205-2 after the position of the second screw rod 205-1 is adjusted. The reset mechanism is a reset spring 209, and the bottom of the reset spring 209 is in contact with the second frame 201, and the top of the reset spring 209 is in contact with the moving plate 206. The gap between the upper leveling roll and the lower leveling roll can be adjusted through the front group of second screw rods 205-1 and the rear group of second screw rods 205-1, the formed inclination angle can be adjusted, and the leveling quality is improved.

The leveler 200 is also provided with a guide roller assembly 202, and the guide roller assembly 202 is used for restraining the position of the steel material 600. Referring to fig. 4, the guide roller assembly 202 includes mounting arms oppositely disposed at both sides of the steel material 600, and further includes a guide flat roller 202-2 connected between the mounting arms, and a guide vertical roller 202-1 is disposed at the inner side of the mounting arms.

The pinch roll assembly 203 and the leveling roll are driven by a motor to synchronously act, and the power of the motor is 4 kw.

As shown in fig. 1, a discharge buffer area is arranged between the uncoiler 100 and the leveler 200, and a first pressure sensing device 500 is arranged on the ground of the discharge buffer area; the first pressure sensing device 500 is connected to the unwinding control device. Whether the length of the steel material 600 in the area is enough to be hung to the ground or not is detected through the first pressure sensing device 500, when the discharging speed of the uncoiler 100 is lower than the leveling speed of the leveler 200, the first pressure sensing device 500 sends out a signal, and the uncoiling control device of the uncoiler 100 receives the signal and then increases the rotating speed, so that the discharging speed of the uncoiler is matched with the speed of the leveler 200, and the production continuity is guaranteed.

As shown in fig. 1, the feeder 300 feeds a leveled steel material 600 into the punch 400. The feeder 300 is also provided with a guide roller device to ensure the position of the plate material fed into the punch 400 to be accurate. Meanwhile, the rotation speed of the feed roller on the feeder 300 can be adjusted steplessly, and the sheet material is fed to the punch 400 at a stable speed. The working speeds of the punching machine 400 and the feeding machine 300 can be adjusted synchronously, and the aim is to ensure the production continuity.

Referring to fig. 1 and 5, a four-column hydraulic press 402 is arranged on the punching machine 400, and a hole forming die is arranged on the four-column hydraulic press 402 and comprises an upper die 402-1 moving up and down and a lower die 402-2 fixedly arranged below the upper die 402-1.

As shown in fig. 6, the punching machine 400 includes a third frame 401, and five groups of punching stations are disposed on the third frame 401, and each punching station is provided with the hydraulic press for performing punching operations on different positions of the steel material 600.

The arrangement of five hydraulic machines is shown in fig. 6, the first punching station is a standby machine, the second, third, fourth and fifth punching stations are working machines, and punching dies required by the working are arranged on the hydraulic machines. The second punching station is responsible for punching an installation lock hole, a limiting sheet hole, an identity tube hole and a hinge hole in the metal coffin, the third punching station is responsible for punching an installation accessory hole, and the fourth punching station and the fifth punching station are respectively provided with an upper lower angle punching head and a lower angle punching head. The punch heads on each hydraulic machine are controlled by an independent hydraulic system, and the punching action can be independently completed without conflict.

When the flattened sheet is conveyed to the punching machine 400, a corresponding blanking program is selected according to the product model, taking the SA product as an example: and the third hydraulic machine at the third punching station firstly acts, the first hole is punched on the plate by the aid of the fitting hole punch head pushed by hydraulic pressure, and the first hole is used as the reference of a subsequent hole position and an angular position, so that punching of the subsequent hole position and the angular position is sequentially completed according to the requirements of product drawings. After the complete program run, the product shown in fig. 7 is obtained.

The punching machine 400 can complete the front punching angle and punching of various products such as SA, SB, SN, SD and the like, and the punching die is made of Cr12 MOV. The hydraulic station adopts a Siemens motor and is provided with an air cooling device.

As shown in fig. 1, the roll forming line 900 is used to roll out the bent edge on the material plate 1500. The roll forming refers to a process operation of rolling the raw material by using a rotating press roll with a smooth surface or a certain shape, so as to obtain a product with a certain shape.

The roll forming line 900 includes a bed and a plurality of roll units sequentially arranged along a length direction of the bed.

As shown in fig. 8 to 10, the rolling unit includes two sets of vertical frames 901 arranged opposite to each other in the left-right direction, and further includes an upper rotary press roll 903 and a lower rotary press roll 904 with complementary shapes, two ends of the rotary press roll are rotatably connected to the left-right vertical frames 901 respectively, and a gap for passing the material plate 1500 is provided between the upper rotary press roll 903 and the lower rotary press roll 904.

As shown in fig. 8, the roll forming line 900 further includes a coupling device 905 corresponding to each roll unit one by one, and a roll driving device for providing a rotary power to each roll unit; the coupling device 905 has an output shaft with left and right directions, the output shaft is connected with the lower rotary pressure roller 904 of the corresponding rolling unit, and the upper rotary pressure roller 903 is a driven roller; the front end and the rear end of the coupling device 905 are respectively provided with a transmission shaft moving back and forth, the transmission shafts of the adjacent coupling devices 905 are connected through a coupling 906, and the rolling driving device is connected with at least one input shaft of the coupling device 905 to realize synchronous driving of the rolling units.

The roller is forged by Cr12, is subjected to numerical control processing after integral quenching, has the hardness of HRC 56-60 degrees, has the characteristics of high strength, high hardness, high precision, long service life and the like, and has small speed difference, small forming resistance and small abrasion to the surface of a steel plate.

As shown in fig. 9 to 11, the flat material plate 1500 is in direct contact with the upper and lower rollers rotating in opposite directions to generate plastic deformation, and since the gap between the upper and lower rollers is the same as the material plate 1500, the deformation of the material plate 1500 can only fit the shape of the gap between the two rollers, and the required profile can be obtained by reasonably designing the shape of the rollers.

Taking the SA product as an example: the line is 24 component press rolls in total, driven by two servo synchronous motors to ensure the feed speed synchronization of the flitch 1500 during the forming process. And (4) the flat material sheet before rolling forming is combined by a series of rollers to form the final SA profile step by step.

The rolling process design adopts imported software and computer design, and FEA analysis is carried out, so that the shape precision of a finished piece is ensured, and a plate is not scratched.

Compared with the traditional welding forming process, the process not only saves the welding cost, but also has seamless transition of roll forming, and is greatly superior to the traditional welding process in the aspects of strength and appearance.

Further, a vertical sliding groove is formed in the vertical frame 901, a sliding plate 902 which moves up and down along the vertical groove is installed in the sliding groove, and the end of the upper rotating pressing roller 903 is rotatably connected with the sliding plate 902 on the corresponding side; the top of the sliding plate 902 is further connected with a vertical screw 907, the screw 907 penetrates through a through hole in the top of the vertical frame 901, a positioning nut 908 is further mounted on the screw 907, and the positioning nut 908 is located above the vertical frame 901.

The spacing between the rotating rollers should be consistent with the thickness of the flitch 1500. By rotating the screw 907, the sliding plate 902 can be moved, so that the adjustment of the distance between the rotating press rollers is realized, and the material plate 1500 with various thicknesses is adapted.

As shown in fig. 7, the punching apparatus 1000 is used to automatically perform the back-punching and cutting of the cold-roll formed material sheet 1500 on line according to the size requirement.

As shown in fig. 12, the punching device 1000 includes a fourth frame 1001, and a pillar 1005 and a punching lower die 1004 are provided on the fourth frame 1001; the stand 1005 upper end is equipped with the seat roof beam, install die-cut hydro-cylinder 1002 on the seat roof beam, the telescopic link of die-cut hydro-cylinder 1002 sets up downwards, the end is installed and is located the die-cut last mould 1003 of die-cut lower mould 1004 top.

As shown in fig. 13, the peripheral side wall of the metal case is divided into continuous ABCD surfaces. Two sets of independent power devices and dies can be arranged on the punching device 1000 to respectively complete the angle punching and the punching. The attack angle operation is only carried out between the A surface and the B surface, between the B surface and the C surface and between the B surface and the C surface, and the shaded parts in the figure are cut out. The punching operation is performed when the portion between the D-face and the next a-face moves to the punching device 1000.

As shown in fig. 1, a second pressure sensing device 700 and a sensing device 800 are further disposed between the roll forming line 900 and the punching machine 400, the second pressure sensing device 700 is disposed on the bottom surface for detecting whether the material plate 1500 is in contact with the bottom surface (i.e., the material plate 1500 is sufficiently fed), and the sensing device 800 is mounted on the top of a frame above the second pressure sensing device 700 for detecting whether the material plate 1500 is too high (i.e., the material plate 1500 is not sufficiently fed). The two are matched with each other to judge whether the material plate 1500 output from the punching machine 400 can meet the requirements of rolling the molding line 900 or not, and the running speeds of the front and rear devices are coordinated in time according to the detected conditions, so that the continuous and uninterrupted running of the production line is ensured.

As shown in fig. 1, a conveying device 1100 is further provided for conveying the cut material plate 1500 into the bending device 1200 and controlling the position of the material plate 1500 in the bending device 1200. Referring to fig. 14, in the present embodiment, the conveying device 1100 includes two sets of belt conveyors 1101. The conveying device 1100 further comprises a pushing mechanism, and the pushing mechanism is used for pushing the material plate 1500 to a fixed position on the bending device 1200.

As shown in fig. 15, the pushing mechanism includes a first pushing mechanism 1102 located at the blanking end of the belt conveyor 1101, the first pushing mechanism 1102 includes a fifth rack 1102-3 (which belongs to the second group of belt conveyors 1101) and a pushing cylinder 1102-1 horizontally installed on the fifth rack 1102-3, a telescopic rod of the pushing cylinder 1102-1 faces the bending device 1200, a vertical pushing block 1102-2 for matching with an opening on the material plate 1500 is installed at a tail end of the telescopic rod, an upper end of the pushing block 1102-2 is rotatably connected with a tail end of the telescopic rod to realize pitching rotation relative to the pushing cylinder 1102-1, and a slope is arranged on a rear side of a lower end of the pushing block 1102-2; the tail end of the telescopic rod of the pushing cylinder 1102-1 is further provided with a limiting surface for limiting the push block 1102-2 to rotate only in the direction of the bending device 1200, and when the push block 1102-2 rotates downwards to a vertical position, the push block 1102-2 is in contact with the limiting surface. When the telescopic rod of the pushing cylinder 1102-1 moves to the left side, the pushing block 1102-2 rotates to an inclined position under the action of the material plate 1500, and the material plate 1500 is not pushed to move; when the telescopic rod of the pushing cylinder 1102-1 moves towards the right side, once the telescopic rod passes through the gap between the adjacent wall plates, the pushing block 1102-2 is inserted into the gap and becomes a vertical state, and then the material plate 1500 is pushed to move towards the bending device 1200, the stroke of the pushing cylinder 1102-1 can be adjusted according to the size of the box body, and when the telescopic rod extends to the limit position, the material plate 1500 is just located at the target position.

As shown in fig. 16, the pushing mechanism includes a second pushing mechanism 1103 located between the first pushing mechanism 1102 and the bending device 1200; the second pushing mechanism 1103 comprises a sixth rack 1103-7 and a lead screw 1103-4 horizontally mounted on the sixth rack 1103-7, and the sixth rack 1103-7 is further provided with a driving motor 1103-1 for driving the lead screw 1103-4 to rotate and a guide rail 1103-6 parallel to the lead screw 1103-4; the second pushing mechanism 1103 further comprises a sliding seat 1103-3 in sliding fit with the guide rail 1103-6, a nut device 1103-5 matched with the lead screw 1103-4 is installed on the sliding seat 1103-3, a through groove which runs forward and backward and is used for allowing the feeding plate 1500 to pass through is formed in the sliding seat 1103-3, a pushing and clamping cylinder 1103-2 located above the through groove is further arranged on the sliding seat 1103-3, a telescopic rod of the pushing and clamping cylinder 1103-2 is arranged downwards, a pressing plate is installed at the tail end of the telescopic rod, and the pressing plate is used for clamping the feeding plate 1500 together with a bottom plate of the sliding seat 1103-3. When the material plate 1500 needs to be moved by the second pushing mechanism 1103, the pushing clamping cylinder 1103-2 acts to clamp the material plate 1500, and then the sliding seat 1103-3 moves to the bending device 1200 along the guide rail 1103-6 under the driving of the driving motor 1103-1; the flitch 1500 can be conveyed to any target position by controlling the corner position of the driving motor 1103-1, after the flitch reaches the target position, the pushing clamping cylinder 1103-2 retracts, the flitch 1500 is released, and then the sliding seat 1103-3 moves leftwards, so that the interference with the bent flitch 1500 is avoided.

As shown in fig. 1, the bending device 1200 is used for bending the material plate 1500 into a side wall frame of the box body.

As shown in fig. 17, the bending apparatus 1200 includes a seventh frame 1208, and a first bending area, a positioning area, and a second bending area are sequentially disposed on the seventh frame 1208 along the traveling direction of the material plate 1500; a first clamping cylinder 1201 and a second clamping cylinder 1204 which are positioned in the positioning area and used for fixing the material plate 1500 are arranged on the seventh rack 1208, the telescopic rod part of the clamping cylinder is arranged downwards, and the tail end of the clamping cylinder is connected with a positioning block; the two groups of bending areas are respectively provided with a group of bending deflection mechanisms; an infrared position switch 1207 is further arranged on the seventh rack 1208 and used for detecting whether the material plate 1500 is in place.

The bending displacement mechanism comprises a bending action cylinder and a bending plate. In the first bending area, the lower end of the first bending actuating cylinder 1203 is rotatably connected with the seventh frame 1208, the upper end of the first bending actuating cylinder 1203 is rotatably connected with the first bending plate 1202, and the right end of the first bending plate 1202, which is close to the positioning area, is connected with the seventh frame 1208 through a rotating connection mode. In the second bending area, the lower end of the second bending action cylinder 1206 is rotatably connected with the seventh rack 1208, the upper end of the second bending action cylinder 1206 is rotatably connected with the second bending plate 1205, and the left end of the second bending plate 1205 close to the positioning area is connected with the seventh rack 1208 in a rotating connection mode. The rotation axis of the bending plate is positioned at the outer edge of the positioning block at the corresponding side. After the two groups of clamping cylinders clamp and position the material plate 1500, the bending plate is turned upwards under the action of the bending action cylinders to form a crease.

As shown in fig. 19 and 20, the box welding apparatus 1400 includes a first body 1401 and a second body 1403 which are oppositely disposed at left and right sides, and further includes a turning frame body 1402 disposed between the first body 1401 and the second body 1403.

The left and right ends of the turning frame body 1402 are respectively connected to the pivot of the first body 1401 and the pivot of the second body 1403, so as to turn between the two bodies. The rotating shaft is arranged on the corresponding machine body through a bearing device.

The turnover frame body 1402 is used for installing a box body to be welded, and a clamping mechanism used for clamping and positioning the box body is arranged on the turnover frame body 1402.

As shown in fig. 21, the box is a rectangular frame surrounded by four sets of side plates, and includes two sets of long side plates and two sets of short side plates, which are oppositely disposed, and the inside of the frame is through in the vertical direction. Note that the top and bottom of the housing as described herein are oriented relative to the housing in the use position shown in fig. 21, and not in a position after being placed on its side on the flip frame 14023.

Referring to fig. 19 and 20, the turning frame 1402 is provided with a positioning surface 1409 contacting with the bottom surface of the box. The clamping mechanism comprises two groups of short-side plate clamping cylinders 1404 which are oppositely arranged left and right, and each side is provided with two short-side plate clamping cylinders 1404. The clamping mechanism further comprises a round supporting seat 1405 in contact with a long side plate on one side of the box body and a long side plate clamping cylinder 1410 used for pressing the long side plate on the other side of the box body, the supporting seat 1405 and the long side plate clamping cylinder 1410 are both left and right, and a pressing block is mounted at the tail end of an extension rod of the side plate clamping cylinder and is used for being in contact with the box body. The clamping mechanism further comprises an upper clamping cylinder 1411 and a lower clamping cylinder 1411 which are used for pressing the top surface of the box body. The upper clamping cylinder 1411 and the lower clamping cylinder 1411 are also two groups, namely a left group and a right group, in order to save space, a middle frame body 1408 located in a space surrounded by the box bodies to be welded is further installed on the turnover box body, cylinder bodies of the upper clamping cylinder 1411 and the lower clamping cylinder 1411 are installed on the middle frame body 1408, a pressure plate 1407 is installed on an extending rod of the upper clamping cylinder 1411 and the lower clamping cylinder 1411, the pressure plate 1407 is long, the length of the pressure plate is larger than the width of the box body, and the pressure plate.

Furthermore, a vertex angle clamping cylinder 1406 is further installed on the middle frame 1408, and an upper vertex angle clamping cylinder 1406 and a lower vertex angle clamping cylinder 1406 are arranged on each middle frame 1408, and the four vertex angle clamping cylinders are located on the inner side of the box to be welded and correspond to the four inner corners of the box in a one-to-one mode. Apex angle die clamping cylinder 1406 has inclination for the curb plate of box, and this angle is preferred 45 degrees, the locating piece is installed to apex angle die clamping cylinder 1406's extension bar end, and the cross sectional shape of locating hole is isosceles trapezoid, the contained angle between two hypotenuses of locating piece is ninety degrees, contacts with the long curb plate inner wall and the short curb plate inner wall one-to-one of the box internal corner department that corresponds.

The stroke of each clamping cylinder is adjusted in advance, and when each clamping cylinder moves to the limit position, the position corresponds to the size of the box body, so that the deformation caused by the fact that a gap is left or the box body is extruded is avoided.

A rotation driving device is arranged on the first body 1401 and is used for driving the turnover frame body 1402 to rotate through a rotation shaft. The preferable structure is as follows: as shown in fig. 20, comprises a modified cylinder 1401-1, a rack 1401-2 and a gear 1401-3; the cylinder body of the deflection cylinder 1401-1 is arranged on a first machine body 1401, the rack 1401-2 is arranged on the extending rod of the deflection cylinder 1401-1 and is arranged in parallel with the deflection cylinder 1401-1, the gear 1401-3 is connected with the rotating shaft on the first machine body 1401, and the gear 1401-3 is meshed with the rack 1401-2. When the shift cylinder 1401-1 is stretched, the rotary shaft is driven to rotate through the rack 1401-2, and the turnover frame body 1402 is driven to turn over for 180 degrees. The rotary driving device can also be in other structural forms, such as a motor which drives the rotary shaft to rotate through a speed reducer.

As shown in fig. 19, a welding robot 1412 is further provided on each side of the first body 1401 and the second body 1403.

The production line comprises the following specific working steps:

step one, as shown in FIG. 7, marking the side walls of the four sides of the box body as continuous A surface, B surface, C surface and D surface; and the shapes of the punching die and the compression roller are set according to the design characteristics on each side wall;

leveling the steel material 600 by using a plate discharging and hole opening equipment line and punching the surface of the steel material 600 to manufacture a continuous material plate 1500; the punching hole is used for forming a folding line at the joint between the side walls and the three-dimensional characteristics on the side walls when the side walls are bent;

thirdly, a roll forming line 900 is used for rolling a bent edge on the material plate 1500;

cutting the material plates 1500 into a plurality of groups by using a punching device 1000, wherein each group of material plates 1500 comprises a continuous surface A, a continuous surface B, a continuous surface C and a continuous surface D;

step five, under the coordination of the conveying device 1100, the cut material plates 1500 are respectively bent into side wall frames of each box body by using the bending device 1200; the method comprises the following specific steps:

(1) the segmented material plate 1500 continues to move under the action of the belt conveyor 1101 until the right end of the molding material plate 1500 reaches the infrared position switch 1207, the feeding belt stops feeding, the two clamping cylinders of the bending device 1200 act to clamp the material plate 1500, and then the second bending action cylinder 1206 acts to bend the D surface by 90 degrees, which is the first step of bending;

(2) and a second bending step: the clamping cylinder and the second bending action cylinder 1206 reset, the pushing cylinder 1102-1 starts to work, the stroke of the pushing cylinder is equal to the length of a short side plate of a product, the clamping cylinder acts again after the pushing cylinder 1102-1 moves to the extreme position to clamp the material plate 1500, and then the second bending action cylinder 1206 acts to bend the C surface by 90 degrees;

(3) and a third bending step: if the current position does not need to move continuously, the first bending action cylinder 1203 acts to bend the surface A by 90 degrees; if the position of the material plate 1500 needs to be continued and moved, the clamping cylinder, the pushing cylinder 1102-1 and the second bending action cylinder 1206 are reset, the second pushing mechanism 1103 starts to work, the clamping cylinder acts again to clamp the material plate 1500 after the material plate 1500 is pushed to the target position, and then the first bending action cylinder 1203 acts to bend the surface a by 90 degrees.

(4) Spot welding is carried out on the bending positions respectively, and the frame body is bent on line. After the bending, the frame is placed on the placement table 1300 and waits for the next process.

Because the side wall plates are formed by rolling and are four continuous ABCD blocks, the connecting part can ensure the dimensional precision of each side wall plate in the length direction, accurate bending and accurate matching can be completed by matching the limit switch and the pushing mechanism of the automatic bending device 1200, and the production efficiency and the quality are obviously superior to those of the existing manual splicing.

And step six, welding the frame into an integrated box body by using a welding device 1400. The method comprises the following specific steps: before welding, other clamping cylinders except the upper and lower clamping cylinders 1411 are in a retraction state, the upper and lower clamping cylinders 1411 extend, the supporting seat 1405 is located below the supporting seat, then an operator places the box body on the turnover frame body 1402, the bottom surface of the box body is in contact with the positioning surface 1409, the long side plate located below the supporting seat 1405 is in contact with the supporting seat 1405, and then the clamping cylinders synchronously act to fix the box body. Then, the welding robot 1412 starts to work, first welds two joints located above, then moves the shifting cylinder 1401-1, turns the frame 1402 to rotate by 180 degrees, welds the other two joints, and finally completes the welding of the four joints, and the finished product is as shown in fig. 21.

Claims

1. The utility model provides a box welding production line which characterized in that: comprises a plate discharging and hole opening equipment line, a rolling forming line (900), a punching device (1000), a bending device (1200) and a welding device (1400);

the plate discharging and hole opening equipment line is used for leveling steel (600) and punching holes on the surface of the steel (600) to manufacture a material plate (1500);

the roll forming line (900) is used for rolling a bent edge on the material plate (1500);

the punching device (1000) is used for cutting the material plates (1500) into a plurality of groups, and each group of material plates (1500) comprises four continuous sections which respectively correspond to four side wall plates of the box body;

the bending device (1200) is used for bending the cut material plate (1500) into a side wall frame of the box body;

the welding device (1400) is used for welding the frames into an integrated box body;

the box body welding production line further comprises a conveying device (1100) which is used for conveying the cut material plate (1500) into the bending device (1200) and controlling the position of the material plate (1500) in the bending device (1200);

the conveying device (1100) comprises a belt conveyor (1101), and the belt conveyor (1101) is used for conveying the material plate (1500) to the bending device (1200);

the conveying device (1100) further comprises a pushing mechanism, and the pushing mechanism is used for pushing the material plate (1500) to a fixed position on the bending device (1200);

the pushing mechanism comprises a first pushing mechanism (1102) located at the blanking end of the belt conveyor (1101), the first pushing mechanism (1102) comprises a fifth rack (1102-3) and a pushing cylinder (1102-1) horizontally mounted on the fifth rack (1102-3), a telescopic rod of the pushing cylinder (1102-1) faces the bending device (1200), a vertical pushing block (1102-2) matched with an opening on the material plate (1500) is mounted at the tail end of the telescopic rod, the upper end of the pushing block (1102-2) is rotatably connected with the tail end of the telescopic rod to realize pitching rotation relative to the pushing cylinder (1102-1), and an inclined plane is arranged on the rear side of the lower end of the pushing block (1102-2); the tail end of the telescopic rod of the pushing cylinder (1102-1) is also provided with a limiting surface for limiting the push block (1102-2) to rotate only towards the bending device (1200), and when the push block (1102-2) rotates downwards to a vertical position, the push block (1102-2) is in contact with the limiting surface;

the pushing mechanism comprises a second pushing mechanism (1103) positioned between the first pushing mechanism (1102) and the bending device (1200); the second pushing mechanism (1103) comprises a sixth rack (1103-7) and a lead screw (1103-4) horizontally arranged on the sixth rack (1103-7), and the sixth rack (1103-7) is also provided with a driving motor (1103-1) for driving the lead screw (1103-4) to rotate and a guide rail (1103-6) parallel to the lead screw (1103-4); the second pushing mechanism (1103) further comprises a sliding seat (1103-3) in sliding fit with the guide rail (1103-6), a nut device (1103-5) matched with the lead screw (1103-4) is installed on the sliding seat (1103-3), a through groove which is arranged in the front-back direction and through which the feeding plate (1500) passes is formed in the sliding seat (1103-3), a pushing and clamping cylinder (1103-2) located above the through groove is further arranged on the sliding seat (1103-3), a telescopic rod of the pushing and clamping cylinder (1103-2) faces downwards, a pressing plate is installed at the tail end of the telescopic rod, and the pressing plate is used for clamping the feeding plate (1500) together with a bottom plate of the sliding seat (1103-3).

2. A tank welding line as claimed in claim 1, wherein: the plate discharging and hole opening equipment line comprises an uncoiler (100), a leveler (200), a feeder (300) and a punching machine (400) which are sequentially arranged;

the uncoiler (100) is used for placing coiled steel (600) and conveying the steel (600) to the leveler (200) in a rotating mode;

the leveler (200) is used for leveling steel (600); a leveling area is arranged on the leveler (200), the leveling area comprises a plurality of upper leveling rollers (207) which are horizontally arranged and a plurality of lower leveling rollers (208) which are horizontally arranged below the upper leveling rollers (207), and the leveler (200) is also provided with a pinch roller assembly (203) which is used for driving steel (600) to move; the leveling machine (200) is also provided with a guide roller assembly (202), and the guide roller assembly (202) is used for restraining the position of the steel (600);

the feeder (300) is used for feeding the leveled steel material (600) into the punching machine (400);

the punching machine (400) is provided with a hydraulic machine, a hole forming die is mounted on the hydraulic machine, and the hole forming die comprises an upper die (402-1) moving up and down and a lower die (402-2) fixedly arranged below the upper die (402-1).

3. A tank welding line as claimed in claim 2, characterized in that: the uncoiler (100) comprises a first rack (101) and a rotatable main shaft (102) horizontally arranged on the first rack (101), wherein a plurality of groups of arc-shaped material bearing blocks (104) distributed circumferentially are arranged on the main shaft (102) through connecting rods (103), and the coiled steel material (600) is arranged on the material bearing blocks (104); the uncoiler (100) further comprises an uncoiling driving device for driving the main shaft (102) to rotate and an uncoiling control device for controlling the main shaft (102) to rotate;

a discharging buffer area is arranged between the uncoiler (100) and the leveler (200), and a first pressure sensing device (500) is arranged on the ground of the discharging buffer area; the first pressure sensing device (500) is connected with the uncoiling control device.

4. A tank welding line as claimed in claim 2, characterized in that: the leveling machine (200) comprises a second machine frame (201), a lower leveling roller (208) is installed on the second machine frame (201), a moving plate (206) is further arranged in a leveling area, the moving plate (206) is connected with the second machine frame (201) in a sliding mode so as to move up and down relative to the second machine frame (201), and an upper leveling roller (207) is installed on the moving plate (206); the leveling machine (200) is also provided with a leveling gap adjusting mechanism for adjusting the gap between the upper leveling roller (207) and the lower leveling roller (208);

the leveling gap adjusting mechanism comprises a leveling limiting mechanism (205) and a resetting mechanism; the two groups of leveling limiting mechanisms (205) are respectively arranged at the front end and the rear end of the moving plate (206) and used for limiting the limit position of the moving plate (206) moving upwards, and the reset mechanism is arranged on the second rack (201) and used for pushing the moving plate (206) upwards to move;

the leveling limiting mechanism (205) comprises a second screw rod (205-1); the second screw rod (205-1) is vertically arranged and matched with a threaded hole formed in the top of the second rack (201), and the lower end of the second screw rod (205-1) is in contact with the top of the moving plate (206);

the reset mechanism is a reset spring (209), the bottom of the reset spring (209) is in contact with the second rack (201), and the top of the reset spring (209) is in contact with the moving plate (206).

5. A tank welding line as claimed in claim 2, characterized in that: the pinch roll assembly (203) comprises an upper pinch roll (203-1) and a lower pinch roll (203-2) which are both horizontally arranged; the lower pinch roll (203-2) is a driving roll and is arranged on a second rack (201) of the leveler (200); the upper pinch roll (203-1) is arranged on a sliding seat (203-3), and the sliding seat (203-3) is in sliding fit with the second rack (201) to realize up-and-down movement relative to the second rack (201);

the second rack (201) is also provided with a pinch pressing mechanism (204) for pressing the upper pinch roll (203-1) downwards;

the pinch pressing mechanism (204) comprises a first screw rod (204-1) and a cylindrical spring (204-3), a vertical guide groove is formed in the second rack (201), a threaded hole matched with the first screw rod (204-1) is formed in the top of the guide groove, the cylindrical spring (204-3) is arranged in the guide groove, the upper end of the cylindrical spring (204-3) is connected with the lower end of the first screw rod (204-1), and the lower end of the cylindrical spring (204-3) is connected with the sliding seat (203-3).

6. A tank welding line as claimed in claim 1, wherein: the roll forming line (900) comprises a lathe bed and a plurality of roll units which are sequentially arranged along the length direction of the lathe bed; the roll unit comprises two sets of vertical frames (901) which are oppositely arranged left and right, and further comprises an upper rotary press roll (903) and a lower rotary press roll (904) which are complementary in shape, two ends of the rotary press roll are respectively and rotationally connected with the left vertical frame (901) and the right vertical frame (901), and a gap for a material plate (1500) to pass through is arranged between the upper rotary press roll (903) and the lower rotary press roll (904);

the roll forming line (900) further comprises coupling devices (905) corresponding to the roll units one by one and roll driving devices for providing rotary power for the roll units; the coupling device (905) is provided with an output shaft in the left-right direction, and the output shaft is connected with the lower rotary pressing roller (904) of the corresponding rolling unit; the front end and the rear end of each coupling device (905) are respectively provided with a transmission shaft in the front-back direction, the transmission shafts of the adjacent coupling devices (905) are connected through a coupling (906), and the rolling driving device is connected with the input shaft of at least one coupling device (905) so as to realize synchronous driving of the rolling units;

a vertical sliding groove is formed in the vertical frame (901), a sliding plate (902) moving up and down along the vertical groove is installed in the sliding groove, and the end part of the upper rotary pressing roller (903) is rotatably connected with the sliding plate (902) on the corresponding side;

the top of the sliding plate (902) is also connected with a vertical screw rod (907), the screw rod (907) penetrates through a through hole in the top of the vertical frame (901), a positioning nut (908) is further mounted on the screw rod (907), and the positioning nut (908) is located above the vertical frame (901).

7. A tank welding line as claimed in claim 1, wherein: the bending device (1200) comprises a seventh rack (1208), and a first bending area, a positioning area and a second bending area are sequentially arranged on the seventh rack (1208) along the advancing direction of the material plate (1500); a clamping cylinder which is positioned in the positioning area and used for fixing the material plate (1500) is arranged on the seventh rack (1208); the two groups of bending areas are respectively provided with a group of bending deflection mechanisms; a position switch (1207) is further arranged on the seventh rack (1208);

the bending deflection mechanism comprises a bending action cylinder and a bending plate, one end of the bending action cylinder is rotatably connected with the seventh rack (1208), the other end of the bending action cylinder is rotatably connected with the bending plate, and one end, close to the positioning area, of the bending plate is connected with the seventh rack (1208) through a rotating connection mode.

8. A tank welding line as claimed in claim 1, wherein: the welding device (1400) comprises a first machine body (1401) and a second machine body (1403) which are oppositely arranged at the left and right sides, and further comprises an overturning frame body (1402) arranged between the first machine body (1401) and the second machine body (1403);

the left end and the right end of the turning frame body (1402) are respectively connected with a rotating shaft on the first machine body (1401) and a rotating shaft on the second machine body (1403) so as to realize turning between the two machine bodies;

the turnover frame body (1402) is used for mounting a box body to be welded, and a clamping mechanism used for clamping and positioning the box body is arranged on the turnover frame body (1402);

a positioning surface (1409) which is contacted with the bottom surface of the box body is arranged on the turnover frame body (1402); the clamping mechanism comprises two groups of short side plate clamping cylinders (1404) which are oppositely arranged left and right, a supporting seat (1405) used for being in contact with a long side plate on one side of the box body, a long side plate clamping cylinder (1410) used for pressing a long side plate on the other side of the box body, and an upper clamping cylinder (1411) and a lower clamping cylinder (1411) used for pressing the top surface of the box body;

the overturning box body is provided with a middle frame body (1408) positioned in a space surrounded by the box bodies to be welded, the cylinder bodies of the upper clamping cylinder (1411) and the lower clamping cylinder (1411) are arranged on the middle frame body (1408), the extending rods of the upper clamping cylinder (1411) and the lower clamping cylinder (1411) are provided with a pressing plate (1407), and the pressing plate (1407) is used for pressing the top surface of the box body;

the middle frame body (1408) is also provided with a vertex angle clamping cylinder (1406), and the vertex angle clamping cylinder (1406) is positioned on the inner side of the box body to be welded and positioned at the inner angle of the box body; the top corner clamping cylinder (1406) has an inclination angle relative to a side plate of the box body, a positioning block is installed at the tail end of an extension rod of the top corner clamping cylinder (1406), and the positioning block is in contact with the inner wall of a long side plate and the inner wall of a short side plate at the inner corner of the box body correspondingly;

the top corner clamping cylinder (1406) has an inclined angle of 45 degrees relative to the side plate of the box body;

the cross section of the positioning block is in an isosceles trapezoid shape; a rotary driving device is arranged on the first machine body (1401) and is used for driving the turnover frame body (1402) to rotate through a rotary shaft;

the rotary driving device comprises a deflection cylinder (1401-1), a rack (1401-2) and a gear (1401-3); the cylinder body of the displacement cylinder (1401-1) is arranged on a first machine body (1401), the rack (1401-2) is arranged on an extension rod of the displacement cylinder (1401-1) and is arranged in parallel with the displacement cylinder (1401-1), the gear (1401-3) is connected with a rotating shaft on the first machine body (1401), and the gear (1401-3) is meshed with the rack (1401-2);

and a welding robot (1412) is also arranged on the side of each of the first body (1401) and the second body (1403).

9. A tank welding production method based on a tank welding production line as claimed in any one of claims 1 to 8, characterized by comprising the steps of:

leveling the steel (600) by using a plate discharging and hole opening equipment line, and punching the surface of the steel (600) to manufacture a continuous material plate (1500); the punching hole is used for forming a folding line at the joint between the side walls and the three-dimensional characteristics on the side walls when the side walls are bent;

thirdly, a roll forming line (900) is used for rolling and pressing out a bent edge on the material plate (1500);

cutting the flitches (1500) into a plurality of groups by using a punching device (1000), wherein each group of flitches (1500) comprises a continuous A surface, a continuous B surface, a continuous C surface and a continuous D surface;

step five, bending the cut material plates (1500) into side wall frames of the box bodies by using a bending device (1200);

and step six, welding the frame into an integrated box body by using a welding device (1400).