CN108544244B - Self-adaptive automatic shearing system for steel strip welding line - Google Patents

Abstract

The invention discloses a self-adaptive automatic shearing system for a welding line of a steel bar and steel band, which comprises a coil material straightening system driven by an asynchronous motor, wherein the steel bar wound on a steel bar coil is straightened by the coil material straightening system, a long material and a short material are welded into the steel bar and steel band by a welding system and then enter a shearing mechanism for shearing, a material storage buffer memory and a feedback system are also arranged between the shearing mechanism and the coil material straightening system, the coil material straightening system is matched with a synchronous feeding device by reasonable structural design, the material storage buffer memory and the feedback system are introduced into the moving track of the long material between the shearing mechanism and the coil material straightening system, the steel bar between the coil material straightening system and the synchronous feeding device can be subjected to certain discharge buffer memory, and further, the steel bar and steel band at a shearing process section can be temporarily stopped for shearing the steel bar and steel band without stopping the coil material straightening system, the safe and reliable operation of the system is ensured.

Description

Self-adaptive automatic shearing system for steel strip welding line

technical field

The invention belongs to the technical field of production and manufacturing, and in particular relates to a PLC control system for self-adaptive automatic shearing of steel strip shearing lines.

Background technique

The market demand for reinforced steel strip is very large, the production efficiency is low, and the welding production is labor-intensive. The harmful welding fumes generated by the welding rod during the manual welding process have a great harm to the health of employees.

As an important part of traditional manufacturing, welding is also deeply influenced by the times. Welding equipment is facing an upgrade from manual and semi-automatic to automated and intelligent. At present, programmable logic controller (PLC) technology has been widely used in the field of industrial automation. In machining production, for the welding of batch workpieces, traditional welding production lines generally use manual feeding and manual control of mechanical shearing, which is time-consuming, labor-intensive, and inefficient.

At present, there are resistance welding machines, steel bar straightening shears, transmission equipment and other devices in the market. The computer program control technology is also very developed, and it is gradually applied to automatic production equipment, and the technology is relatively mature. However, there is no automatic production line for steel strip products in the market so far, especially the shearing process after welding can only be operated manually.

SUMMARY OF THE INVENTION

In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a self-adaptive automatic shearing system for welding lines of reinforced steel strips. Through reasonable structural design, the coil straightening system is matched with the synchronous feeding device, while A storage buffer and feedback system is introduced on the moving trajectory of the long material between the two, which can perform a certain discharge buffer for the steel bar between the coil straightening system and the synchronous feeding device, thereby realizing the process of reinforced steel. During the cutting process of the strip, the steel strip in the cutting process section can be paused for cutting, and the coil straightening system does not need to be stopped, which ensures the safe and reliable operation of the system.

In order to achieve the above-mentioned purpose, the technical scheme adopted in the present invention is an adaptive automatic shearing system for the welding line of the steel strip, including a coil straightening system driven by an asynchronous motor, and a coiled straightening system for the steel bars wound on the steel coil. Straightening, the long material and short material are welded into reinforced steel strips by the welding system, and then enter the shearing mechanism for shearing. There is also a material storage buffer and feedback system between the shearing mechanism and the coil material straightening system. The steel bar sent from the coil straightening system enters the storage buffer and feedback system through the roller conveying device. The storage buffer and feedback system includes a liftable sliding block device. With the synchronous feeding device between the feedback system and the shearing mechanism, the start and stop of the synchronous feeding device and the feeding speed are controlled by the control system. The average feeding speed of the synchronous feeding device is the same as the average feeding speed of the coil straightening system.

The slider device of the storage buffer and feedback system drives the wire-pull sensor during the movement process. The wire-pull sensor calculates the reserves of long materials through displacement detection and feeds back the reserves to the control system. The actual storage of the material buffer and feedback system adjusts the feeding speed of the long material synchronous feeding device.

The welding system is a resistance pressure welding system, including a connected resistance pressure welding device and a cylinder, the welding contact head of the resistance pressure welding device is connected with the cylinder, and the cylinder is connected with the control system. When the resistance pressure welding device is welded, The two welding contacts of the resistance pressure welding device squeeze the middle, the cylinder pushes the welding contacts to apply the extrusion force, and the welding chuck of the resistance pressure welding device welds the short material and the long material by resistance pressure welding. welding.

There is a proximity switch on the periphery of the resistance pressure welding system, and the proximity switch is connected with the control system. If the proximity switch cannot detect the short material, it will send a signal to the control system.

The synchronous feeding device includes a servo motor, the motor shaft of the servo motor is connected with a reducer, and the reducer is connected with the steel belt.

The control system is also used for adjusting the feeding speed of the reinforced steel belt synchronous feeding device according to the stored material value fed back by the material storage buffer and the feedback system.

In fact, the synchronous feeding device also includes an incremental encoder, which is connected with the control system to feedback the displacement of the steel strip. The rotary shaft of the incremental encoder and the roller that supports the steel strip to slide forward connected.

The shearing mechanism is also used to cut the long material between the two reinforced steel strips into short material.

The control system is a PLC controller.

Compared with the prior art, the present invention has at least the following beneficial effects. Through reasonable structural design, the coil straightening system is matched with the synchronous feeding device, and at the same time, a storage device is introduced into the moving track of the long material between the two. The material buffer and feedback system can perform a certain discharge buffer for the steel bar between the coil straightening system and the synchronous feeding device, thereby realizing the cutting process of the steel strip during the cutting process. The steel strip is suspended for shearing, and the coil straightening system does not need to be stopped, which ensures the safe and reliable operation of the system. After the steel strip is welded, it is rolled and straightened by a shaping machine, and then cut by a shearing mechanism. It can be used not only for shearing steel strips, but also for preparing short-section steel bars. Before welding, a batch of short-section steel bars is prepared and stored in the feeding vibrating plate.

Further, after welding one section of the steel strip, the resistance pressure welding system should immediately weld another section, that is, the distance between the two frames of the two steel strips is very small, which will inevitably cause a short section of the second frame. It is difficult to embed due to restrictions, so a certain distance is set between the two steel strips, and the two long steel bars at this distance can be cut into short sections.

Further, the PLC control system can be interlocked with the length of the steel strip grid, and can realize automatic cutting and counting. And the system can adjust the vertical netting and shearing distance according to the change of the net width.

Description of drawings

FIG. 1 is a schematic diagram of the overall structure of the welding line of the reinforced steel strip of the present invention.

FIG. 2 is a schematic diagram of a part of the enlarged structure of FIG. 1 .

In the picture: Reinforcing bar coil-1, sensor-2, asynchronous motor-3, coil straightening system-4, coil butt welding device-5, positioning and pressing device-6, roller conveying device-7, storage buffer and Feedback system-8, roller-9, synchronous feeding device-10, incremental encoder-11, reinforced steel strip-12, short material-13, normally closed proximity switch-15, resistance pressure welding welding system-16, Shearing mechanism-17, finished product discharging device-18

Detailed ways

The technical solutions in the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to this application. Scope of the new type of protection.

In the embodiment of the present invention, the control system adopts a PLC controller, and the PLC controller is a Siemens S7-200smart controller. The reinforced steel strip 12 and the short material 13 mentioned in the embodiment of the present invention are composed of a ladder-like appearance. The short sections make up the block in the middle.

As shown in Figures 1 and 2, the present invention includes a coil straightening system 4 driven by an asynchronous motor 3. After the steel bar wound on the steel bar coil 1 is straightened by the coil straightening system 4, the long material is adjusted by the welding system. It is welded with the short material to form a reinforced steel strip, and then sheared by the shearing mechanism 17 to form an independent reinforced steel strip product. It can be supported and welded between two long materials; as shown in Figure 1, a sensor 2 is also set between the steel bar coil 1 and the coil straightening system 4;

There is also a storage buffer and feedback system 8 between the shearing mechanism 17 and the coil straightening system 4. The steel bars sent from the coil straightening system 4 enter the storage buffer and feedback system 8 through the roller conveying device 7, and store the steel bar. The material buffer and feedback system 8 includes a liftable sliding block device, the steel bars are erected on the sliding block device, and the sliding block device moves up and down according to the storage of the long material. When the sliding block device moves upward, it can drive the long material to arch upward. Therefore, the reserves of the storage buffer and the feedback system 8 are increased, and vice versa, the reserves of the storage buffer and the feedback system 8 are reduced;

It also includes a synchronous feeding device 10 arranged between the storage buffer and feedback system 8 and the shearing mechanism 17. The start and stop of the synchronous feeding device 10 and the feeding speed are controlled by the control system. In the shearing position, the synchronous feeding device 10 suspends feeding, and after the shearing mechanism 17 finishes cutting, the synchronous feeding device 10 starts to continue feeding, and the average feeding speed of the synchronous feeding device 10 is the same as the average feeding speed of the coil straightening system 4 ;

The slider device of the storage buffer and feedback system 8 drives the wire-pull sensor during the movement. The wire-pull sensor calculates the reserve of long material through displacement detection and feeds back the reserve to the control system. The actual storage of the buffer and feedback system 8 adjusts the feeding speed of the long material synchronous feeding device.

In an optional embodiment of the present invention, the welding system is a resistance pressure welding system, comprising a resistance pressure welding device and an air cylinder connected, the welding contacts of the resistance pressure welding device are connected to the air cylinder, the air cylinder is connected to the control system, and the resistance pressure welding device is connected to the air cylinder. When the pressure welding device is welding, the two welding contacts of the resistance pressure welding device squeeze the middle, the cylinder pushes the welding contacts to apply the extrusion force, and the welding chuck of the resistance pressure welding device is resistance pressure welded. In addition, in a certain embodiment, a proximity switch is arranged on the periphery of the resistance pressure welding system, and the proximity switch is connected with the control system. If the proximity switch cannot detect the short material, a signal is sent to Control System.

As shown in FIG. 1, in an optional embodiment of the present invention, a coil butt welding device 5 and a positioning and pressing device 6 are also provided between the coil straightening system 4 and the roller conveying device 5. When the coil straightening system 4 is stopped, the next roll of steel bars is sent to the coil straightening system 4. After the material head is straightened by the coil material straightening system 4, the material head is connected to the tail of the previous roll of steel bars. Then, the positioning and pressing device 6 is used for pressing, and the coil butt welding device 5 is used for welding and fixing, so as to realize the butt joint between the front and rear steel coils.

As shown in FIG. 2, in an embodiment of the present invention, the control system is a PLC controller, and the slider device in the storage buffer and feedback system 8 is connected with a pull-wire sensor. The slider device is due to the size of the storage capacity. Moving up and down drives the puller of the pull-wire sensor to move, so as to collect the size of the storage material and send it to the PLC controller. The PLC controller can adjust the coil straightening system according to the storage value of the storage buffer and feedback system 8. 4. Adjust the feeding speed of the reinforced steel belt synchronous feeding device 10, so that the material storage in the storage buffer and feedback system 8 is within a suitable range.

The roller 9 is provided with an incremental encoder 11. When the steel bar is sent to the specified position of the resistance pressure welding system 16, the coil straightening system 4 and the roller 9 stop. Continuing the action will increase the amount of material stored in the material storage buffer and feedback system 8. At this time, the PLC controller will adjust the straightening speed of the coil straightening system 4 according to the feedback reserve value. After the welding is completed, the coil straightening system 4 and the roller 9 continue to operate, and then stop at the next designated position; in the preferred embodiment of the present invention, by setting a certain distance between the two reinforced steel strips 12, two The reinforced steel strip can also be cut into short pieces 13, and the short section feeding device 14 is used to send the prepared short pieces to the tray at the bottom of the resistance pressure welding system 16; this structural design is reasonable and can effectively reduce the shear of the shearing device. It is difficult to cut, and it has achieved the problem of saving energy and not wasting raw materials, which has improved economic benefits to a certain extent.

In an embodiment of the present invention, a shaping and rolling mechanism is provided between the welding system and the shearing mechanism 17 . After the steel strip is welded, the shaping machine is used to roll and straighten it, and then the shearing mechanism 17 is used to cut it. The shearing mechanism 17 can be used not only for shearing steel strips, but also for preparing sub-section steel bars. Before welding, a batch of sub-sections are prepared and stored in the sub-section feeding device 14 . After the welding of one steel strip, another section should be welded immediately, that is, the distance between the two frames of the two steel strips is very small, which will inevitably cause the short section of the second frame to be restricted and difficult to embed. A certain distance is set between the section steel strips, and the two long steel bars at this distance can be cut into short sections. After the steel strip is welded, it goes through the shaping device, and then is sent to the shearing mechanism 17. The displacement of the steel bar is calculated by the incremental encoder 11. When the displacement of the steel bar increases to the length of a steel strip, that is, a steel strip is a finished product, and then The shearing mechanism 17 cuts it and discharges it; the present invention also includes a finished product discharge device 18, which is connected with a control driving device, which can make the flat plate on the finished product discharge device 18 incline to the long side.

In the present invention, the production cycle of each 2 reinforced steel strips (regardless of length) controlled by the self-adaptive automatic shearing PLC control system of the steel strip welding line is about 120 seconds, and the shift output (calculated in 7 hours) is about 420 pieces. Compared with manual welding, the automatic steel strip welding line has the flatness of the steel strip (especially the short steel bar), the appearance is regular and consistent, the stability of the welding point and the welding shear resistance standard meet more than 0.3 times the yield force of the steel bar; the roller 9 has Incremental encoder 11, when the steel bar is sent to the designated position for welding, the straightener and roller 9 stop, continue to run after welding, and stop at the next designated position, the welding line of the steel strip is automatically cut by PLC In the control system, the displacement of the steel strip is calculated by the incremental encoder 11. When the displacement of the steel bar increases to the length of a steel strip, that is, a steel strip is a finished product, and then the shearing mechanism 17 cuts it and discharges it. ; The finished product discharge device 18 adopts a 6-meter-long flat plate with auxiliary support. The finished product discharging device 18 is located behind the shearing mechanism 17, and the reinforced steel strip 12 is cut by the shearing mechanism 17 and then falls on the flat plate. The angle of the plate is reset after the steel belt falls.

In one embodiment, the resistance pressure welding system 16 is provided with a proximity switch 15 on the periphery, and the proximity switch 15 is connected to the control system. If the proximity switch 15 does not detect short material, a signal is sent to the control system.

The proximity switch is divided into a normally open proximity switch and a normally closed proximity switch. The normally open proximity switch is disconnected when there is no action (the induction part is not blocked), and is closed when the proximity switch acts (the induction part is blocked) of. The normally closed proximity switch is closed when there is no action (the sensing part is not blocked), and is open when the proximity switch is operating (the sensing part is blocked).

In this embodiment, a normally closed proximity switch can be selected. During the welding process, if the proximity switch 15 detects that the short material is not provided, it will send a signal to the control system, so that the control system can process it in time to avoid welding errors. Optionally, the control system shuts down and activates the alarm device.

Claims (9)

1. The self-adaptive automatic shearing system for the welding line of the steel strip is characterized in that it comprises a coil straightening system (4) driven by an asynchronous motor (3), and the steel bars wound on the steel coil (1) are adjusted by the coil. The straightening system (4) is straightened, and the long material and the short material are welded into reinforced steel strips by the welding system and then enter the shearing mechanism (17) for shearing. The shearing mechanism (17) is connected with the coil straightening system (4). There is also a storage buffer and feedback system (8) between ), the steel bars sent from the coil straightening system (4) enter the storage buffer and feedback system (8) through the roller conveyor (7), and the storage buffer The feedback system (8) includes a liftable sliding block device, the steel bars are erected on the sliding block device, and also includes a synchronous feeding device (10) arranged between the material storage buffer and feedback system (8) and the shearing mechanism (17). ), the start-stop and feeding speed of the synchronous feeding device (10) are controlled by the control system, and the average feeding speed of the synchronous feeding device (10) is the same as that of the coil straightening system (4). 2. The self-adaptive automatic shearing system for reinforced steel strip welding lines according to claim 1, wherein the slider device of the storage buffer and feedback system (8) drives the pull-wire sensor in the process of moving, The wire-pull sensor calculates the storage of the long material through displacement detection and feeds back the storage to the control system. The control system adjusts the feeding speed of the long material synchronous feeding device according to the storage of the long material and the actual storage of the storage buffer and feedback system (8). 3. The self-adaptive automatic shearing system for welding lines of reinforced steel strips according to claim 1, wherein the welding system is a resistance pressure welding system, comprising a connected resistance pressure welding welding device and a cylinder, and the resistance pressure welding The welding contact head of the welding device is connected with the cylinder, and the cylinder is connected with the control system. When the resistance pressure welding welding device is welding, the two welding contact heads of the resistance pressure welding welding device squeeze the middle, and the cylinder pushes the welding contact head to apply the pressure. Pressure, the welding chuck of the resistance pressure welding welding device welds the short material and the long material in the way of resistance pressure welding. 4. The self-adaptive automatic shearing system for reinforced steel strip welding lines according to claim 1, wherein the resistance pressure welding system is provided with a proximity switch on the periphery, and the proximity switch is connected with the control system. material, then send a signal to the control system. 5. The self-adaptive automatic shearing system for welding lines of reinforced steel strips according to claim 1, wherein the synchronous feeding device (10) comprises a servo motor, and the motor shaft of the servo motor is connected with a reducer, and the reducer and the steel belt connected. 6. The self-adaptive automatic shearing system for reinforced steel strip welding lines according to claim 1, wherein the control system is also used to adjust the steel bar according to the stored material value fed back by the material storage buffer and the feedback system (8). The feeding speed of the steel belt synchronous feeding device (10). 7. The self-adaptive automatic shearing system for welding lines of reinforced steel strips according to claim 1, characterized in that, the synchronous feeding device (10) also comprises an incremental encoder (11), and the incremental encoder ( 11) Connected with the control system for feedback of the displacement of the reinforced steel strip, the rotating shaft of the incremental encoder (11) is connected with the roller (9) that supports the reinforced steel strip to slide forward. 8. The reinforced steel strip welding line adaptive automatic shearing system according to claim 1, wherein the shearing mechanism 17 is also used to cut the long material between the two reinforced steel strips (12) into Short stock (13). 9 . The self-adaptive automatic shearing system for welding lines of reinforced steel strips according to claim 1 , wherein the control system is a PLC controller. 10 .

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