Combing Machine Improves Connecting Rod Structure To Prevent Looseness Of Shaft Connecting Rod

< p > connecting rod is a pmission part for combing rocker and swing arm on comber, 2 pieces per set.

After a long time of high-speed operation, the shaft bushing embedded in the connecting rod structure is easy to loose, which affects the stability of the comber. In order to ensure the normal operation of the comber, we have improved the connecting rod structure.

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< p > the combing machine connecting rod material widely used at present is 40Cr, and the material of the bushing is ZCuSn5Pb5Zn5.

After the axle bushing and connecting rod are processed, they are assembled. The two parts are assembled and assembled before the assembly. The interference volume is 0.03 millimeters to 0.04 millimeters. The assembly process is as follows: pressing the shaft into the connecting rod 2-, 26Js7 (+0.11-0.11) hole, grinding two planes, fine boring 2- hole 20G6 hole.

As the material of the bushing is soft, the bushing will often be squeezed down when it is assembled. It can not guarantee the interference volume (0.03 mm to 0.04 mm). After long time running, it is easy to loose and affect the normal operation of the comber.

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< p > the improved connecting rod joint has increased the screw fastening structure and achieved very good results.

The assembly process of connecting rod assemblies is: selecting connecting rods and bushings, requiring interference between 0.03 millimeters and 0.04 millimeters. Then press the bushing into the connecting rod 2- "26Js7" (+0.11-0.11) hole, then drill the 4-M6 screw hole, then use 4-M6 * 6 screws to tighten the shaft lining, the remaining hole part is welded flat, the outer surface is polished and smooth, then the two plane is rolled to fine boring 2- 2- 20G6 hole.

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< p > the original structure is slightly skewed when assembling, the interference volume is difficult to guarantee, and the bushing is easy to loose.

However, when the hole size of 2- 20G6 is large, the bushing can be extruded and re pressed into the bushing before processing, thus reducing the scrap rate of the parts.

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< p > the improved structure can not be pressed out after the hole boring of 2- 20G6. The parts can only be scrapped and can not be reused.

However, after the machine works for a long time, the shaft bushing and connecting rod will not loose, which will ensure the normal operation of the machine.

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< p > by improving the < a href= "//www.sjfzxm.com/news/index_c.asp" > link structure < /a >, the combushing machine no longer loosened after long and high-speed running, reducing the user's replacement time and cost, making comber more competitive in the market.

Shanxi Jingwei Heli Machinery Manufacturing Co., Ltd. Hu Liying < /p >

< p > E7/5 comber is a type of machine manufactured by Switzerland in 1990s. It is still used in many textile enterprises.

In the production practice, some enterprises found that the relay control system of the aircraft has the following problems: first, the control circuit is complex; because of the large number of timers, relays and limit switches, the control cabinet has large shape and complicated internal wiring; two, the reliability is poor, because the contact points are short and the life is short. The bad contact directly affects the reliability of the equipment; three, the maintenance is inconvenient, because the circuit is complex, and some relays are difficult to buy in the market, which brings inconvenience to the maintenance and affects the production.

Therefore, it is imperative to pform it.

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< p > according to process requirements, instead of changing the original < a href= "//www.sjfzxm.com/news/index_c.asp" > mechanical structure < /a > and action sequence, the programmable controller is used instead of the relay in the original control cabinet. The main problem is the selection of programmable controller.

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< p > determine the number of input and output signal points of PLC according to control requirements and actions of each part, so as to determine its type.

According to the action requirements of the equipment, the synchronous operation of the comber's doffer drive and feeding cotton stick does not need regular continuous work, but a simple rotational speed given pformation.

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< p > from the angle of reducing the < a href= "//www.sjfzxm.com/news/index_c.asp" > the electrical control system < /a > cost, the relay contact of the output module can be implemented externally, eliminating the module / number and the digital / analog conversion block.

In this way, the programmable controller only needs to configure the switch input / output module, the input signal comes from the button switch on the operation board, the fault detection switch, the threshold switch and so on, and the output signal comes from the indicator light on the control board, the speed conversion tangent point, the fault code pmission and so on.

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< p > in addition, because programmable controller adopts software control, general inverter and ordinary Y series motor can be used instead of the original dual speed mother machine.

On the main circuit diagram, the programmable controller 3L+ and Q1.1 connect the DCM and FWD of the frequency converter to control the positive running terminal; the Q0.7 multifunction input terminal M11 with the frequency converter, controls the low speed and the spot movement; Q1.0 connects the frequency converter's multi-function input terminal M12, controls the motor's high speed; the original mechanical brake changes to the frequency converter to stop the DC brake.

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After P improved design, the performance of the machine has been significantly improved.

The first is to start smoothly, avoid impact and improve reliability.

The general programmable controller's anti-jamming ability can reach the impulse of 1000V and 1US, and the average fault free working time can reach 50 thousand to 100 thousand hours.

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< p > second is to reduce energy consumption.

Due to the complex structure of the twin parent motor, the electrical performance and power consumption are greatly reduced after long use.

After pformation, the actual running current and power are greatly reduced, up to 30% to 40%.

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< p > third is to improve safety, maintain simple and convenient.

Due to the multiple protection of the motor to the motor (overcurrent protection, overload protection, overvoltage protection, etc.), the motor can be damaged when the external operating conditions change, the load changes or the internal fault occurs in the inverter.

The complex wiring is replaced by the program in the programmable controller, the operation cost and maintenance cost are reduced, the work is stable, and the failure rate is low, which can achieve the goal of saving energy and reducing consumption and improving efficiency.

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