Single handle control bridge grab crane application

 

    fuel plants unloading device is a bridge grab crane, the crane is used in Xinxiang plant products, in the original design of the main Deputy rope ropes and control is to take control, respectively, which adopts double handle control, after several years of running the fuel factory for double handle operation shortcomings and drawbacks of a transformation after transformation, greatly improved the unloading efficiency, but also reducing the intensity of the work of the workers, and this combined with the actual production of thermal power plant fuel plant dragon bridge grab crane single handle transformation, for example, for a more detailed analysis of the benefits and demonstration illustrates the single handle control, in the actual production of effect. Through extensive application of this technology can achieve energy saving, and improving economic efficiency.

 

    Keywords: single handle; bridge grab crane; Differential Control

 

    Dragon Cogeneration fuel plants for the primary and secondary rope double handle control transformation after a single lever control (ie, differential control), bridge grab crane unloading efficiency has been significantly improved, obviously be extended equipment life. In this paper, the actual dragon power plant fuel production plant, the principle of the differential control are introduced in order to improve the understanding of the differential control to promote extensive application in the actual production of this technology.

 

    First, the working principle

 

    (A) bridge grab crane grab the working principle (as shown in Figure)

 

In dual handle control process, a steering handle motor control Ropes, printed on graph switch l, 2 for control, thigh lift, enabling Grab the opening and closing; another deputy rope handle controls the steering motor , that figure 7-8 for switch control, to achieve sub-rope lift, in order to achieve improved grab and fall; coordination of operations through two handles can be achieved grab of all operations.

 

In single-lever control process, through the differential control system consisting of a handle control can be achieved for the primary and secondary rope lift, enabling the bridge catch of all operations.

 

    (Two) bridge grab crane grab control principle

 

    Double handle control process, the bridge grab crane grab control block diagram (shown in Figure 2)

 

    Single handle control process, bridge grab crane grab control block diagram (Fig. 3)

 

    From Figure 2, Figure 3 the comparison, we can see that the bridge grab crane before and after reconstruction, mainly in the control loop increases the differential switch, through the work of the differential switches to complete a single grab handle on the various Under Control.

 

    Differential switch diagram shown in Figure IV, figure cam piece N 1-N 6, respectively, to control the corresponding contacts, thus achieving a decline grab grab automatically when opening and closing automatically when caught up, but also for running grab provide the necessary protection.

 

    In single-lever operation by control device 1: Grab achieve coordinated control of the movements and the opening and closing operations, the use of a differential switch, due to the increased resistance of the rotor circuit, the motor can be operated in forward and reverse power status and anti- then braking state, the use of additional resistance can be adjusted in the sink when caught Ropes will not be too loose, vice rope in the open bucket drops help to keep the grab in the open state.

 

    In single-lever operation, ideal for single lever controls the position shown in Figure 5, but in the power plant fuel plant dragon transformation process in order to make it easier operations, reduce equipment maintenance, the actual location map single handle control, as six shows, so you can handle by an operation to achieve the same effect as double-handle operation, transformation, significantly reduced the labor intensity of the bridge caught the driver, while it implements grab semiautomatic work to improve the grab the reliability and stability, most notably, after the transformation, you can grab a handle to complete the action, significantly reduced the bridge caught the driver's misuse rate and improve the life of the equipment.

 

    Second, the contrast to the situation

 

    (A) double handle control process drawbacks grab coordination depends mainly on the driver's proficiency, as Vice Rope Ropes with no fixed link between institutions in the driver grab labor-intensive work, fatigue, prone to misuse; Shen grab the grab after the lifting of the moment, the driver closed the slightest negligence will cause the motor force alone, closed motor is easy to overload, even burned; grab up and down limit position is not easy to control, falling catch Dou Yi strong collision with stockpiles; fall faster due to open bucket, grab the pile stops when the thigh is easy to jump out from the pulley, causing Ropes premature retirement; grab for the realization of the right conditions, drivers always Jog operation or hit Enter, electrical components often in the transition process, reducing component life.

 

    (Two) single handle control

 

    Grab bridge grab crane operation using a single differential control handle that later. Ropes mechanism may be a control signal and the sub rope mechanism linked to a control signal, to use a single handle to the bridge crane grab grab coordinated operation, to avoid the bridge reciprocating mechanical grip of the driver operation, while improving the efficiency of .

 

    Third, the benefit analysis

 

    (A) using a single lever controls the differential control itself has significant benefits

 

    Use single handle operation, to eliminate the bridge caught the driver of the reciprocating machinery operation, reducing the fatigue strength; Use single handle operation, extending motor life; using a single lever operation, extending the service life of wire rope; using a single handle operation, to achieve a semi-automatic bridge grab crane grab work.

 

    (Two) can be achieved using a single handle operation overhead grab crane is reasonable, coordinated operation

 

    Single Handle operation itself has a very high energy efficiency, mainly in: improve work efficiency, reduce the guard time; improve the stability of equipment operation and safety.

 

    Through the above analysis, the use of single-handle operation for changing production conditions and production levels has its important role.

 

    (Three) theoretical energy

 

    Carts motor power is 11K w;

 

    Trolley motor power is 3. 7Kw;

 

    Reel motor power 22Kw;

 

    Hydraulic head motor power is 14 0w;

 

    The average intake of coal 2 6 - 300,000 tons, averaging 28

 

Tons, approximately equivalent to 4,667 cars;

 

    The actual calculation, after the transformation of each coal car unloading speed

 

Was increased by 10 minutes or so;

 

    Annual electricity savings:

 

    (11 × 2 + 3.7 + 22 × 2 + n 14 × 2) ×

 

  1 0 ÷ 60 × 4667-54432.8Kw

 

    Electricity to 0.39 yuan / Kw h calculation, the annual cost savings:

 

    0. 39 × 54432. 8 - 2.1 万元

 

    In addition, although the differential control system makes use of equipment costs increased, but their social benefits significantly improved, in addition to the bridge caught the driver can significantly reduce the labor intensity, but also significant savings can be opened and rope replacement motor needed labor and materials fees, single handle control system that the differential control system in power plant fuel plants using Dragon period of time, no longer appear the phenomenon of convergence control handle contacts, significantly reduced the frequency of replacement of wire rope, especially important since from the use of a single lever control , branch of the unloading of fuel efficiency has been greatly improved, reducing the number of guard costs, we can see from these single-lever control of their economic and social benefits are very substantial.

 

    Epilogue

 

    Through the above discussion we can make everyone fully aware that a single lever controls the differential control advantages of the dragon power plant will soon be able to recover for investment in equipment, in addition to single-lever control also has a good operational performance, energy-saving effect is remarkable, reliable operation etc., vigorously promote energy conservation in today's single-lever control has its important promotional significance.