Rubber conveyor belt is made of several layers of fiber fabric and rubber bonded into a tape, used for transporting lumpy, granular, powdery or pieces of goods. Widely used in mining, building materials, chemical, coal, electric power, metallurgy and other industries.

1. Common damage forms of rubber conveyor belt
Common forms of conveyor belt damage include:

1. Longitudinal tearing of conveyor belt;

2. Transverse tearing of the conveyor belt;

3, conveyor belt vulcanization joint tear;

4. Conveyor belt cracking;

5. The upper and lower adhesive layers of the conveyor belt are worn.

Two, the harm of conveyor belt damage

1. If the rubber conveyor belt is partially damaged and the core layer is not repaired in time, rain and foreign pollutants will soak into the deep layer of the belt, which will expand the damaged part of the conveyor belt and shorten the service life.

2. For the steel wire rope conveyor belt, if the steel wire rope is exposed, it will not be able to operate normally without repair, and it may also cause the conveyor belt to be scrapped, causing great impact on the production of users and economic losses.

Three, conveyor belt joint bonding

The bonding of conveyor belt joints mainly includes three forms: cold bonding, hot curing bonding and mechanical bonding.

1, cold bonding Note: the characteristics and main process of cold bonding please refer to the last article: "conveyor belt bonding repair product selection (I) - conveyor belt joint lap (cold bonding)"

2, hot vulcanization bonding

Hot vulcanization bonding can effectively improve the efficiency of the belt joint, the bonding process is stable, and the service life of the belt joint is long. However, compared with cold bonding, the process is more complex, the cost is higher and the operation time is longer. The following is the main operation method of hot vulcanization bonding: hot vulcanization bonding commonly used equipment tools, materials include: belt vulcanization machine, peeling machine (can be artificial peeling), cutter, splint, grinding machine, wire brush, hot vulcanization agent, hot vulcanization core glue, hot vulcanization surface glue, etc..

1, joint form and length calculation

Belt bonding joint generally adopts bevel ladder type, which has good stress condition, large contact area, high bonding strength and is not easy to crack. The joint length is also called the bonding length. The size of the bonding area and the joint strength are determined by the joint bonding length. If the joint is too short, that is, the bonding area is small, resulting in the bonding strength can not meet the requirements; If the joint is too long, the bonding area is large and the strength is large, but the practical application effect is not obvious, but causes the joint processing difficulties and material waste.

Note: this data is for reference only, the specific joint length should be determined according to the actual working conditions.

2. Joint production

(1) the joint length is generally determined according to the width of the belt. If the width of the belt is 1400㎜, the length of the belt joint is 260㎜. If the number of belt layers is six, it is necessary to cut five layers, the Angle between the knife edge and the belt is 30 degrees. Draw the ladder cutting line on the belt head with A red pen according to the determined length and cutting Angle of the ladder, with A end marked on the working surface and B end marked on the non-working surface. The diagram below:

(2) with the cable knife along the cutting line along the first line to cut a layer of deep line, cutting can not be too strong, to avoid cutting the line layer, and then strip off the first layer of glue. Cut layers in the same way, avoiding damaging the canvas layer when cutting. After cutting the belt ladder, polish, clean and dry the joint.

2, joint bonding

(1) with a brush on the ladder layer layer coating hot vulcanizing agent (power can 855 conveyor belt hot vulcanizing agent), to be dry after the first layer of the second layer coating.

(2) after the hot curing agent is dry, lay the core adhesive (the power can be POX-TGM hot curing core adhesive).

（(3) interface closure: lap and compaction the belt connector.

Diagram of joint lap
(4) in the working face and non-working face interface position spread above the glue, ready for vulcanization.

3, curing heating (1) after the end of the glue, exhaust and side repair work, side bonding quality, directly affect the service life of the joint. In belt joint on both sides of the cushion pad iron, above and splint fixed clamp connector parts of belt, before the two coupling joint, the vulcanizing machine under the next frame, board and pressure device heating plate fixed group in turn away, and then cover the vulcanizing machine on the upper part of the electric heating board, insulation board, frame, and guarantee with the frame alignment, evenly tighten. After the upper and lower frames are aligned, tighten the upper and lower frames with bolts, and pay attention to the uniform tightening force.

Place the heating plate

Place pressurized water bags

Place pressurized beam

(2) turn on the power supply to start vulcanization, control in strict accordance with the belt vulcanization process parameters, when the temperature reaches the optimal temperature, start to calculate the vulcanization time. After curing, cut off the power supply, to be vulcanizing machine natural cooling after removing the vulcanizing machine.

Four, power (POWEROX) conveyor belt joint hot vulcanization bonding products

(1) the power of 855 conveyor belt rubber hot vulcanizing agent
Black, hot vulcanized adhesive paste, specially used for hot vulcanization bonding of conveyor belt joints. Packing specification: 1kg/ can.

(2) the power of POX-TGM hot vulcanization core adhesive black, dedicated to the hot vulcanization bonding of conveyor belt joints. Thickness (mm) :2, 3, 4, 5; Width (mm) : 500 Packing Specifications: 10kg/ volume.

(3) the power of POX-STK hot curing surface adhesive black, dedicated to the hot curing bonding of conveyor belt joints. Thickness (mm) :2, 3, 4, 5; Width (mm) : 500 Packing Specifications: 10kg/ volume. (To be continued)
The company's power (POWEROX) brand products are only sold through distributors throughout the country, if necessary, please contact us. We will transfer you to the dealer in your area, to provide you with faster, more accurate, more systematic service. Thank you for your attention and support!