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Of coal mine permissible explosives mostly small drug volume of [1], the diameter of the outer diameter size (32 ± 1) mm, ( 35 ± 1) mm, quality specifications (150 ± 3) g, ( 200 ± 5) g, In the middle package, the middle package is 3 kg, and 15 rolls (200 ± 5) g or 20 rolls (150 ± 3) g of explosives should be neatly arranged in a PVC plastic bag. The traditional process is the collection, smearing, smearing, medium packing, sealing, etc. of the medicine roll, mainly by manual completion, low efficiency, and safety accidents occur [2]. To this end, the Civil Defence Bureau of the Commission of Science, Technology and Industry for National Defense issued an industrial policy of “Developing the Automatic Production Line for Explosives in the Explosivesâ€. Relevant research institutes have increased this research and development efforts and have achieved initial results.
2 Safety explosives package automatic sealing machine
The key of the equipment is to design the bagging and vacuuming process into a mechanism and complete it by a compound movement. It is characterized by simple structure and high work efficiency. It adopts explosion-proof technology and has good safety. It can be used as automatic packaging for existing explosives. Auxiliary equipment for heat sealing of production line sealing.
2. 1 Design basis and implemented functions
The thermal sensitivity and electrostatic sensitivity of the explosive characteristics of explosives determine the explosion-proof requirements of electrical equipment for explosives and their dust environment. The overall scheme design is based on GB50089-2007 "Safety Code for Civil Blasting Equipment Engineering Design". The realization function is to pack the medicine roll after the stacking, waxing and bagging, and realize the function of inserting the tensioning and pumping mechanism into the middle package→tensioning middle package→vacuum→heating→retracting package.
2. 2 Design content
(1) Explosion-proof self-control hot rod. Its main function is to provide PVC sealing heat source for explosive materials, and can automatically control the heat sealing temperature range of 130~140 °C. It consists of a large number of heat-generating parts and electronic components, which is a typical detonating source. In order to prevent the explosive gas from entering the heating element and eliminating the possible hazard of the detonating source, an explosion-proof chamber is designed in the device, and the structure is as shown in FIG. The outer casing is able to withstand the explosive pressure of the internal explosive mixture and prevents continued explosion of the surrounding explosive mixture. Hot rods do not create arcing, sparking or possibly igniting explosive mixtures under normal operating conditions.
The automatic control device of the hot rod is placed in the above-mentioned explosion-proof chamber, and the thermal insurance specification is 160 ° C, 2A switch to control the heat. Select the thermocouple temperature to 0~500 °C, and apply 204-1 anti-rust oil to each explosion-proof surface before assembly. The net volume of the main cavity is designed to be 0.44 L, the net volume of the wiring chamber is 0.11 L, the clearance is ≥6 mm, and the rear end cover is designed with the word "EX" and painted with red paint. The heat-insulating glass sleeve and the insurance connection are sealed with 504 glue.
(2) Explosion-proof air pump. The main function of the air pump is to vacuum the explosive. The size of the medium package is about 250 mm × 150 mm × 100 mm. The remaining net space of the explosive is about 216 mL, and the storage air volume is about 200 mL. According to the design of 4. 24 t / h production capacity, the choice of air pump power is 500W, vacuuming time is about 2 s. The motor is an explosion-proof three-phase asynchronous motor.
(3) Tensioning and pumping composite mechanism [3]. For the vacuuming and heat sealing of explosives, it is the key process of automatic packaging. For the bagging process, the bag should be opened before vacuuming, in order to achieve simple structure, high work efficiency, good reliability, bagging and vacuuming process. Designed as a mechanism and completed by a composite motion, the structural principle is shown in Figure 2.
The duckbill 7 before the pipe can take into account the bag opening and vacuuming function. The opening size is small, about 4 mm, and the other end of the duckbill passes through the filter 5 and the explosion-proof body is connected to the explosion-proof vacuum pump of 500W. In addition, for safety reasons, there are designed explosion-proof and deburring chambers, and printed circuit boards and electronic components are placed into the explosion-proof and detonation chambers through the wiring pads.
The design overcomes the defects of the existing heat sealing machine in the explosive, and the bag and the vacuum are jointly performed by a composite movement of a mechanism, and the structure is compact, simple, and high in efficiency. Flameproof design technology improves the safety of the package.
3 Automatic control system for industrial explosive automatic charter The automatic control system adopts CC-l ink field bus, decentralized control, frequency conversion positioning control and other technologies to automatically control the process of automatic arrangement, package, and packing of explosives. The production line is guaranteed to operate stably and reliably.
3. 1 control object
The control object is mainly a relatively independent functional block of the production line of the medium charter machine, specifically: 1 middle package function block: used for arranging the medicine strips conveyed from the front section, and packaging them into vacuum bags with plastic film;
2 Packing function block: It is used to accept the finished bag in the package, put it into the carton, control the auxiliary equipment to automatically seal the bundle; 3 transfer function block: used to complete the transfer and transfer of materials.
3. 2 control system hardware configuration
(1) System configuration. The whole system contains about 350 digital IO, 5~11 inverters, and 12~18 independent temperature control loops. The main control unit uses X2NPLC, about 100 digital IO, which is responsible for controlling the motor. The control unit of the package uses FX1NPLC, which is about 80 points of digital IO, and is responsible for the control of the single package. The boxing control unit uses FX2NPLC, about 80 points of digital IO, responsible for the control of the boxer. One station per unit, each unit adopts CC-l ink field bus
5Mbps的速度速度。 The connection is made, the entire network uses a running speed of 2. 5Mbps.
(2) CC-l ink network configuration. The master station is set to: STATION NO (station number): 0; MODE (mode): 0; B RATE (communication speed): 2 (2. 5M); the middle package is set to: STATION NO: 0 (station number is 1) ; OCCUPY STATION: 1 (the number of occupied stations is station); B RATE: 2 (transmission speed is 2.5); the packing module is set to: STATION NO: 03 (station number is 3); OCCUPY STATION: 1 (occupied station) The number is 1 station); RATE: 2 (transmission speed is 2. 5M)
3. 3 software configuration
The whole system adopts the idea of ​​decentralized control and centralized management.
(1) Master station software function. In order to ensure the safety of the production line and avoid contact with the packaging materials, the inverter and the motor starter, use one X2NPLC as the network main control station, control the entire CCl ink network, and place it in the control room away from the explosion hazardous environment. Coordinates dozens of motors in the production line, collects working data of each slave station, and provides functions such as production statistics, fault alarm and system debugging diagnosis.
(2) Slave software function. Based on the explosive characteristics of packaging materials and explosives, it is required that in the early stage of the explosion, the machine can be safely stopped even in the case of communication failure. Therefore, each independent functional unit uses a separate PLC for signal acquisition and logic in the field. Operation, at the same time, the PLC detects the running status of the network through software, and automatically starts the emergency stop program once it is abnormal.
(3) Production line configuration. It is completed by one F940GOT, and the test command can be sent to any device of the medium-clad line through the touch screen, and the working state of the medium-filled line can be monitored in real time.
(4) Other software features and software features. For data that does not require real-time response, only one station per slave is used. Configure the software change point function. If the PLC output point is damaged, the damaged point can be replaced without a programming tool. Equipped with on-site PLC monitoring function Due to explosion-proof and anti-corrosion requirements, this is placed in the fully sealed control cabinet to monitor the IO status of any PLC on site.
4 Conclusion
(1) the composite sheet bags pumping means and pumping pipe (1 left and right) of two vacuum genus duckbill gold completed, the structure is simplified.
(2) The shape of the front end of the bag-making mechanism is a duckbill type, and the longer side is placed horizontally, which can improve the stability of the bag.
(3) Realize the “X†fork structure of the bag and the exhaust rod system (Fig. 3), and it can be combined with the movement of the cylinder to improve the work efficiency.
(4) The structural design of the explosion-proof has improved the intrinsic safety of explosive production.
(5) The automatic control system of the charter machine adopts CC-l ink field bus, decentralized control, frequency conversion positioning control and other technologies to automatically control the process of automatic arrangement, package wrapping and packing of explosives. The production line is guaranteed to operate stably and reliably.
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