The basic situation of the company's four air compressors. It can be seen from Table 1 that the screw machine is equipped with a 20-minute empty time. The main purpose is to prevent the air pressure from changing rapidly in a short time. The air compressor frequently starts to affect the machinery, the power grid, etc., and there is an empty car, so there is power loss. Not very economical. The pressure switches of the four air compressors are all mechanical structures. The pressure switches of the screw compressor and the screw machine are produced by different manufacturers, and the installation positions of the switches are different. Although the adjustment is artificially adjusted, the pressure switch action reset synchronization is still different. Larger, it is easy to cause unbalanced running time between single machines. For example, if the machine is running in parallel, assume that the 1 machine maintains the upper and lower limits of the pressure. When the two machines are started without pressure in the system, the system pressure rises to the machine stop. If the gas consumption in the system is consistent with the displacement of the two machines, then 2 The machine will always be in a shutdown state due to the system pressure, and in other cases, the single machine working time will be unbalanced. No. Technical index Exhaust volume Exhaust pressure motor Power starting mode Direct no-load Y No-load type screw-type screw type pressure switch Features mechanical error, unstable mechanical error, unstable mechanical, large error, no Stable mechanical error is large, unstable reaches the upper limit pressure, there is empty car running, there is no min, adjustable empty time, factory setting, min, adjustable empty time, factory setting, empty running power, kW (measured), in order to better solve the above Insufficient, I designed a simple and easy relay control circuit to optimize the parallel operation of the air compressor. The premise of the design is that it does not change the original wiring of the air compressor, but is it applied? AC--Using the external control circuit method to optimize the air compressor to run the machine tool 2003.1 in parallel with the pressure switch of each air compressor, and connect the external control circuit to change the original pressure control characteristics of the air compressor through the external control circuit. If the external control circuit is faulty or not used, the air compressors can be restored to the original pressure control characteristics at any time. That is to say, each air compressor has two sets of pressure control characteristics, one set is preferred and one set is reserved. In short, there will be no problems caused by the external control circuit, which will affect the production problems. The specific method is: first install two pressure switches, one for external control circuit, one for the external control circuit with the pressure switch out of control, cut off the external control circuit protection. Then, the four air compressors are divided into two groups, one and one group, two groups and two groups, and the two air compressors are alternately cycled through the external control circuit. That is, the first group (or the second group) is operated, and when the system pressure reaches the upper limit, the first group (or the second group) is stopped, and when the system pressure drops to the lower limit, the second group (or the first group) is operated. Such an alternate cycle can avoid frequent starting of a single screw machine, so that the empty time can be adjusted to one minute, thereby greatly reducing the power loss of the empty vehicle when the previous system pressure drops slowly, and sharing a pressure switch characteristic, The four machines basically reach the balance of running time. The design circuit is shown in Figure 1. The air compressor is started at the same time and the set time is 10 seconds. The SB is an experimental button. By operating the experiment button and observing the indicator light before opening the air compressor, it can be known whether the entire circuit can work normally. At the same time, the operation of the unit can be artificially adjusted by operating the experiment button. The PC is a counting loop, which is used to measure whether the operation capacity selection is reasonable. Generally, it is better to start the single machine every hour without more than 6 times, otherwise the operating capacity should be re-selected. Or do not use alternate cycle mode. The SP pressure switch in the circuit is set to prevent the SP pressure switch from running out of control. The upper limit pressure of the SP pressure switch must be greater than the upper limit pressure of the pressure switch. The upper and lower pressures of the SP pressure switch must be greater than the upper and lower pressures of the four air compressors, otherwise the design purpose will not be achieved. The design circuit is connected with the pressure switch of each air compressor as shown in Figure 2. This circuit is mainly suitable for occasions where the system pressure is not changed too fast. It is best to have the same capacity of the two sets of air compressors. The air compressor must be started at no load at any time. Like some piston air compressors, due to insufficient configuration, when there is a load start, a pressure relief solenoid valve and a pressure maintenance valve must be installed. The circuit is simple and flexible to operate. First, the SA is closed, and the HL light is on, indicating that the power supply is available. According to the actual gas consumption, the SA machine is alternately cycled and operated in parallel with the SA machine. At the same time, the SA and 2 machines are alternately cycled. After selecting the capacity, the air compressors that need to be alternately cycled are started. After the first time the upper limit pressure is reached, the alternate cycle starts. This circuit design has been applied to the air compressor station of the US dishwasher company for more than a year. It has received relatively good energy-saving and reasonable operation effects, and it is worthy of promotion of air compressor stations with similar conditions. Machine tool electrical appliance 2003.1 application? Communication--Optimize air compressor parallel operation with external control circuit method
Drive shaft is to transmit motor rotary dynamic force onto the bit, meanwhile to withstand axial and radial load from drilling weight. We have the following two types of drive shafts:
1) Bit nozzle pressure loss is 7.0Mpa, Using hard alloy radial bearing and Drive Shaft Assembly with thrust bearings.
2)Bit nozzle pressure loss is 14.0 Mps, using hard alloy radial bearing and PDC cutter flat thrust bearing. It has longer lasting life and higher bearing capacity.
Drive Shafts Assembly and Parts Drive Shafts Assembly And Parts,Drive Shaft Assembly,Drive Shafts Parts,Hydraulic Drive Motors Weifang Shengde Petroleum Machinery Manufacturing Co., Ltd. , http://www.sdpetromachine.com
Optimize air compressor parallel operation with external control circuit method
Optimizing the air compressor in parallel with the external control circuit method Huang Zerong (Guangdong Shundemei Dishwasher Manufacturing Co., Ltd. 528) The modern factory is becoming more and more electrified, and many pneumatic tools and cylinders have become an indispensable part of the manufacturing industry. To achieve aerodynamics, an air compressor must be provided to provide compressed air with sufficient pressure. Considering the large gas supply, the reliability and economy of the gas supply, and the air compressors often have multiple air compressors with different exhaust capacities, they need to be operated in a single machine or in parallel for normal use and standby. When the air compressor is running in parallel, there are some shortcomings for various reasons. The following is an example of four air compressors of the company to illustrate the shortcomings of parallel operation.