Clamping System of Unloading Belt Conveyor in Uncoiler Line brilliance jinbei Shihai Factory uses more than ten sets of dies to shear plates. So as to meet the requirements of different mold heights and lengths. A lifting and telescopic discharge conveyor belt is installed between the press and the stacker for conveying the plate cut by the die to the stacker. Due to the insufficient design rigidity of the supporting steel beam at the back of the machine and the problems left over from maintenance, the belt conveyor vibrates back and forth during the working process, which reduces the service life of the belt, damages the bearing and drives the toothed belt to jump teeth. After analysis, the reasons are summarized as follows: 1. Before shearing, the steel plate was still, and after shearing, the speed quickly increased to150m/s ... Such a huge momentum change made the supporting steel beam lean forward. 2. Due to structural reasons, the middle part of the belt conveyor cannot be supported by rollers, and only two groups of wishbone brackets are used for support. When the belt is fully extended, the influence of the dead weight of the metal plate on the belt contact part is not considered during maintenance and replacement. At this time, when the paper runs, the belt driving resistance increases. 3. Individual roller bearings are damaged or the processing quality is not high, the circular runout is seriously out of standard, and the dynamic balance is not good. Under normal circumstances, the amplitude of the belt conveyor reaches 5mm, and when processing mass plates, such as floors and side walls, the amplitude of the belt reaches 10mm, accompanied by the phenomenon of tooth jumping of the driving belt. The jumping of toothed belt further increases the vibration amplitude of belt conveyor. In view of the above problems, it is decided to "fix" the front end of the belt conveyor on the pressure column. The specific scheme is to install two guide plates on both sides of the belt conveyor. Install two pairs of hydraulic cylinders on the pressure column. The vibration of the belt conveyor is limited by the friction generated when the hydraulic cylinder is clamped. It is difficult to measure the acceleration time of sheet metal, friction coefficient between belt and bracket, contact area and other parameters. It is impossible to calculate the pressure of hydraulic system in advance, and it can only be determined by experiments. The device uses electric control to supply oil to the pneumatic hydraulic pump, and the two-position four-way fixed position electromagnetic valve controls clamping and loosening. And install a pressure relay to detect whether the pressure in the system meets the set requirements. In order to prolong the service life of the hydraulic pump and reduce the failure time, a filter was installed at the oil suction port and a pneumatic triad was installed in front of the pump. The hydraulic principle is shown in figure 1. Its working process is as follows: compressed air after filtration, decompression and "lubrication" is supplied to the pneumatic hydraulic pump. During clamping, the pneumatic hydraulic pump sucks oil through the filter and one-way valve, and injects it into the liquid cylinder through the two-position four-way belt positioning electromagnetic reversing valve. The vibration of the belt conveyor is limited by the friction generated by the gripper. When relaxing, the pneumatic hydraulic pump sucks out the oil in the cylinder through the reversing valve and discharges it back to the oil tank through the one-way valve on the left side of the above figure. The pressure relay is used to detect whether the pressure in the liquid cylinder reaches the standard. The actual test shows that when the hydraulic system pressure is 1 1Mpa, the vibration amplitude of the belt conveyor is close to zero, so the pressure relay is set to 10Mpa. In the design of the electrical part, the device is independent of the original automatic line electrical part, and only statements are added in the functional block FC 100. Any fault of the clamping system will not affect the normal operation of the automatic line. See Figure 2 and Figure 3 for the wiring diagram and schematic diagram. Considering the safety of the equipment, the electrical requirements prohibit the belt lifting operation when the hydraulic system is in the clamping state. To sum up, the circuit design is completed, and the final function is as follows: 1 The belt is clamped and cannot be lifted or lowered. It is realized by adding "relay" interlock in the ninth sentence of program (NW9). 2. When the system is powered on, the clamping system will automatically relax. The energizing relay and the pulse time relay are connected in series (NW3). 3. Carry out the belt lifting operation, and the belt will be automatically loosened (NW3). 4. When the production line is connected, the clamping system automatically clamps (NW2). 5. Design of short-circuit and open-circuit pressure relay (NW4). 6. Anti-adhesion of internal and external relays in 6.PLC program. The internal "relay" interlock and external relay interlock of the program realize double protection (Figure 3). 7. The free-wheeling diode prolongs the contact life. The solenoid valve coil is connected in parallel with a diode to prevent the relay contact from sticking and prolong the relay life (Figure 3). 8. The clamping can be released manually at any time. 9. The electromagnetic directional valve is controlled by pulse output with positioning, which saves energy and reduces oil leakage. In addition, the damaged bearing was replaced; Replace the roller with poor dynamic balance; Restore the shape and dimensional accuracy of some parts. After the transformation, the effect is good, which prolongs the life of discharge belt, bearing and toothed belt, reduces belt deviation and improves the performance of the whole machine. Save maintenance funds * * * ten thousand yuan. Fig. 1 hydraulic schematic diagram fig. 2 wiring Tu Tu 3 wiring schematic diagram The following is the program content added in FC 100: nw2: o "nw2: o"10129 "o (a (a" temporary data area) .o0659ls5t #/. O0890 "a" temporary data area ",O0884 = L 0.0 A L 0.0 BLD 102 =" temporary data area. O0887 "a (A0.0Ls5t # 5SDT199a" temporary data area. O0890 "rt199nop00t1004" = "0081 "nw5:A" temporary data area.o0890 "an" temporary data area.o0889 "oao0889" rt198 nop0nop0at198) an "1kloc-0/ 004 "=" temporary data area ".o0886al0.0l5t # 30set197a" temporary data area. o0889 "rt197nop00t197 =" temporary data area ". 8S SE T 195 A "temporary data area.o0890" rt195nop0 nop0at195 = "01002" nw8: o "temporary data area.o0887" o "temporary data area" 8+034 "an"10133 "an"10620 "an" 00408 "a"10513 "a" temporary data area "o0886 8+029 "Output Belt Clamping Bool I14.3"165438+O0884 "Pressure Relay BOOL DB 100. DBX 2. 1 "temporary data area" O0659 continuous auxiliary Bool DB 100.dbx30. loose relay booldb100. DBX 30.5 "Temporary Data Area" O0885 Relaxation Maintenance Time BOOL DB 100. DBX 30.6 "temporary data area" O0886 BOOL M 2 10.5 "temporary data area.o0887" belt clamping relay bool o0887. O0890 "Temporary data area.0889" Belt clamping operation BOL M 104. 1 "Temporary data area.0890" Belt loosening operation BOL Q6.5 "o08891"Output belt has been clamped BOL Q9.1" Ool q9.2 "01002" clamping solenoid valve.