Hydraulic system of a large projectile bottom screw disassembler
Hydraulic system of a large-scale projectile bottom screw dismantling machine Li Yili Zhi Zhaohua Lu Yongjin 2 (1 Mechanical and Electrical Integration Center, Hebei University of Science and Technology, Shijiazhuang 050054, China; 2. Shijiazhuang Xigemaike Industry and Trade Co., Ltd., Shijiazhuang, Hebei, safety and practicality.
In 1997, the author cooperated with the Electronic XX Research Institute of the Ministry of Information Industry to develop a large-scale projectile (100130mm) hydraulic bottom fire and bottom screw disassembler. The hydraulic system of the machine was developed by the author and is described below.
Large artillery shells are expensive, and some cartridges use precious metal copper alloys. The usual way of repairing is to replace the explosives and reassemble them; only a few can't be dismantled, and other methods (such as hydraulic cutting) are destroyed. The warhead weighs about 3040kg. The front part is a fuze. The middle part is filled with explosives. The rear part is screwed into a fine screw plug, which is called the bottom screw. The outer end surface of the bottom screw has two blind holes with a depth of about 15mm, which are used for inserting and rotating the bottom screw for loading and unloading. The diameter of the hole varies with the range of the elastic type is 810mm. The cylinder has about 10kg, and the shape is like a long cylinder with a slight taper. There is also a small screw plug at the back, which is called the bottom fire. The bottom fire structure is similar to the bottom screw and the disassembly method is similar. Therefore, the structure, action and principle of the two machines and their hydraulic systems are similar, except that when the bottom fire is removed, the torque is small; because the cylinder is thin, the clamping force cannot be too large. This article only describes the hydraulic system of the bottom screw disassembler.
The original mechanical transmission bottom screw disassembler adopts a motor-reduction box-bottom screw jaw structure. Because the mechanical transmission torque is difficult to be limited, the bottom screw has been removed, and the pin on the bottom screw claw is rigidly rotated, and the bottom screw is scraped into a deep groove, which causes almost a big disaster. With the hydraulic system, the torque of the bottom screw disassembler can be easily limited, and it is not afraid of suffocating the car, and the safety is much better.
See the hydraulic schematic diagram for the hydraulic bottom screw disassembler. The working cycle is as follows: the hydraulic system is first activated by the operator; the warhead is lifted onto the trolley and pushed down the rail to the clamping cylinder. There is a roller support wheel, and the warhead is rotated on the support wheel, so that the bottom screw blind hole is aligned and sleeved on the bottom screw claw pin; the clamp cylinder is descended to clamp the projectile; the operator leaves the bomb room On-site; start the oil motor in the control room, loosen the bottom screw; a spring on the back of the bottom screw jaw pushes it toward the warhead, so that the pin does not come out when it rotates, and can gradually retreat with the bottom spiral; the proximity switch Record the number of turns of the bottom spiral, to the predetermined value (ensure that the bottom screw has been completely removed), the motor stops; the operator comes back, release the clamp cylinder; remove the bottom screw and the bullet. During the whole process, people with clips and loose warheads were present. When the bottom snail was removed, people left to a safe place and monitored with a video head.
I have repeatedly tested the disassembly torque before design. The Soviet-made artillery shell torque is no more than 1Nm, and the domestic bombs are quite different. Some even add a 1.5m sleeve to the large wrench, and the whole person can't be removed. This is caused by damage to the thread when the bottom screw is riveted. In order to balance safety and the ability to dismantle most of the shells, the maximum disassembly torque was set at 3000 Nm after consultation with the relevant personnel; the number of large shells was not required, and the efficiency was not required. The speed was set at 20 r/min, which was 15 r/min. ) slightly faster. The design and component selection of the hydraulic system are similar to the usual ones, and will not be described in detail. The characteristics of the hydraulic system are only described. When the bottom screw is removed, the maximum torque occurs at the moment of the first release (the first buckle). At this time, the motor is in the "boring car". State, the required traffic is minimal. After the bottom screw turns, the torque will drop down at once. Therefore, the hydraulic system uses a double gear pump to form a high and low pressure double pump circuit. (A variable displacement piston pump can also be used, but the cost is high and maintenance is difficult).
The auxiliary time of the whole process is long, in order to reduce energy consumption and reduce heat, the electromagnetic overflow valve is adopted for both high and low pressure chestnuts. After the pinch, the two-way hydraulic lock maintains the clamping pressure, and the high and low pressure pumps are unloaded. When the bottom snail is started, the motor starts and the two pumps stop unloading. At this time, the pressure relay mounted on the motor oil line controls the low pressure and large flow pump to unload or work.
It was originally prepared to put the hydraulic station in other rooms, only the actuator was placed in the bomb disposal room, and the reinforced concrete wall in the demolition room was 2m thick, and it was not easy to drill the hole; and the two iron gates were arranged to bypass the pipe. It is too long and it is easy to cause the pipeline to oscillate. Therefore, the hydraulic station is also placed in the bomb disposal room, but as far as possible away from the bottom screw disassembler and the motor uses an explosion-proof motor; the wiring of the solenoid valve (the coil is fully encapsulated in the plastic case) is fixed with resin; all sensors, proximity switches All are selected for non-contact type.
Although the operation of this machine is simple, but because there are many sensors to ensure safety, the hydraulic circuit also adopts electromagnetic relief valve and pressure relay because of consideration of safety and energy saving, and there are many electrical contacts. For different types of bombs, the size and thickness of the bottom snails are different, and more links need to be adjusted. Therefore, the electrical uses PLC control. Electrical control cabinets and monitors are placed in the control room.
Because it is the first time to manufacture, some parameters still need to be explored. In order to replace and adjust the oil circuit or hydraulic components at any time; and taking into account the beauty and compactness, the hydraulic valves all use a stacking valve.
Each of the clamp cylinder circuit and the motor circuit is provided with a relief valve as a safety valve.
This machine uses a two-way hydraulic motor, so it can also be used for the bottom screw, but the pressure relay and the proximity switch (number of turns) should be set on the motor return line so that when the torque exceeds the limit or reaches the predetermined number of turns (slightly delayed) ) Stop in time. At the time of acceptance, the relevant departments have proposed to try this function. Due to the failure of the original task book, these safety measures were not available on the machine. As a result, the bottom screw was not able to stop in time, and the two 512 pins on the bottom screw were cut off.
After the trial and dismantling of the coach and the real bomb, the two machines passed the acceptance of the relevant departments at the end of 1999 and were put into use. (Continued on page 9) (Continued from page 2). It has won many new achievements in the National Invention Award and the Science and Technology Progress Award. In 1996, it established a factory in Ningjin County to industrialize the production of silicon semiconductor materials for solar cells. . Later, it entered into a joint venture with Japan Matsushima Co., Ltd. to make it the largest solar monocrystalline silicon plant in Southeast Asia. More than 90% of its products are sold abroad. Currently, a solar silicon material is produced, processed and serviced outside the county town of Ningjin County. The industrial zone for content has begun to take shape.
Up to now, our school has signed comprehensive cooperation agreements with the people's governments of 9 provincial cities including Baoding City, Tangshan City, Handan City and Xingtai City; signed a comprehensive agreement with 76 county-level people's governments; and Handan Iron and Steel, Baodingtian More than 20 large-scale enterprises such as Weiwei Group, Shijiazhuang Pharmaceutical Group, Baoshuo Group and Xuangong signed a comprehensive cooperation agreement. They have built 9 engineering and technology centers in the enterprise and built 3 research institutes in the school. Multi-level network of industry, university and research cooperation.
Of course, our work has just begun, and we look forward to the future. We have the confidence and determination to continue to climb the new era of technological innovation in the path of cooperation between industry, academia and research in the face of the challenges of the new century. Make new and greater contributions to the economic construction of Hebei Province!
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