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Holdback

Field:Introduction of holdback produced by Zhengzhou Songyang Coal Machine Manufacture Co., Ltd In order to prevent the reverse or smooth phenomenon when the inclined belt conveyor stops with load, the reverse or braking device is added according to the calculation of braking moment. Roller holdback, suitable for head roller, driven by reducer, larger power, larger pulley diameter, belt conveyor with reducer above ZQ65, is more suitable for upward conveying than belt conveyor with inclination less t...

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Introduction of holdback produced by Zhengzhou Songyang Coal Machine Manufacture Co., Ltd

In order to prevent the reverse or smooth phenomenon when the inclined belt conveyor stops with load, the reverse or braking device is added according to the calculation of braking moment.

Roller holdback, suitable for head roller, driven by reducer, larger power, larger pulley diameter, belt conveyor with reducer above ZQ65, is more suitable for upward conveying than belt conveyor with inclination less than 18 degrees, it has the advantages of rapid reverse stop, small reversal distance, is the first choice of large and medium shape inclination conveyor.

Working principle of holdback produced by Zhengzhou Songyang Coal Machine Manufacture Co., Ltd

In the holdback, there are multiple shaped blocks distributed in the raceway formed by the inner ring and outer ring. When the inner ring is in positive operation, it will drive the shaped blocks to rotate together. When the rotating speed is within a certain range, the shaped blocks will deflect under the action of centrifugal force and disengage from the inner ring and outer ring, so as to realize no-wear operation. When the inner ring is in reverse operation, the special-shaped block is made in contact with the inner ring and the outer ring under the action of the spring, and it is wetted into a whole, so as to bear the reverse torque transmitted from the inner ring.

Technical requirements of holdback produced by Zhengzhou Songyang Coal Machine Manufacture Co., Ltd.

1, Temperature: - 20 ~ + 60 ℃.

2, The temperature of holdback in normal running shall be below 30oC.

  1. Under rated thrust torque, holback shall work 105 times, and the surface of wedge, inner ring and outer ring shall be free from pitting, plastic deformation and crack.
  2. The heat treatment hardness of the main parts of holdback shall conform to the provisions in table 3.

Table 3

 inner ring and outer ring of HRC wedge

60 ~ 64  58 ~ 62   58 ~ 62

  1. All parts must pass the inspection, and the purchased parts must have qualification certificate before assembly.
  2. The direction shown on the steering indicator after assembly shall be the same as that shown in wedge assembly.
  3. The exposed surface of holdback shall be coated with one coat of primer and two coats of paint.
  4. The end paint of the inner ring of holdback shall be red, and its paint color of the other exterior surfaces shall be milky yellow. Other colors may be adopted according to the requirements of users.

Types of holdback produced by Zhengzhou Songyang Coal Machine Manufacture Co., Ltd.

Commonly used holdbacks include belt holdback, roller holdback and special block holdback:

(1) Belt holdback, mainly composed of limiter, braking device and check back, when the electric pulley normally running, driving belt is stored in the limiter. Limiter is made from metal sheet, Check out device is to prevent from the pulley brake circuit rubber belt, one end of the brake band can be fixed on the metal rack, when pulley reversal, brake band was taken to the nylon conveyor belt and bag glue roller, through the friction effect, make the drive roller and a strong reversal stop wear-resisting rubber belt, belt type holdback has simple structure, suitable for small power belt conveyor, the downside is back to a stop, The larger the diameter of the pulley, the longer the reversal distance will be, so the high power and large volume of mobile conveyor should not be used;

(2) roller holdback is a roller overrunning clutch, it consists of inner ring and outer ring, roller and spring of holdback outer ring, the normal operation of conveyor, inner ring counterclockwise, roller in the big end of the wedge space, roller doesn't work, when the inner ring clockwise, roller is not affected by inner ring, under the action of spring force, to the small end of the wedge space movement, because of the roller and holdback, the outer ring of the friction to the inner ring of holdback cannot movement, have the effect of holdback, by the same token, when the outer ring is not fixed, can be used as a speed limit of overrunning clutch.

(3) Special block holdback is clutch of special block, when applied to inverse check special form, it consists of holdback ontology and holdback arm, holdback arm and holdback at the end of the ontology of the outer ring fixed together, the other end fixed on the large Angle conveyor frame or foundation, in order to get holdback moment, its working principle is similar to roller holdback, which is a holdback is crucial in the special block, when the speed of the inner ring is greater than the outer ring, special block of almost do not produce friction, when the speed of the outer ring is greater than the inner ring, special block under the action of the friction gradually squeezed tight inside and outside the circle make the speed of the inner and outer ring close to, this is the role of overrunning clutch, When the outer ring does not move and the inner ring reverses, the shaped block will come into play to achieve the reverse effect

 

holdback

Senior technical team to make every detail

SONGYANG has a number of senior engineers and technicians to provide technical support, efficient production team, and shorten the delivery cycle.
Senior technical team to make every detail

SONGYANG has a number of senior engineers and technicians to provide technical support, efficient production team, and shorten the delivery cycle.

Processing strength

SONGYANG has six production and processing workshops including casting, rivet welding, metalworking, assembly, ring chain and heat treatment. It also has over 80 large-scale modern processing equipment and large and medium-sized general equipment. Provide effective guarantee for the quality of coal mine equipment.

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