Vertical wellbore bedrock construction technology - rock loading and lifting work

Loading rock lifting work accounts for about 50% to 60% of the entire tunneling cycle time, which is the key to determining the speed of vertical shaft construction.

(1) Loading work

Vertical shaft construction generally uses rock grabs to install rock. There are NZQ 2 -0.11 rock grab machine, long rope suspension rock grab (HS type), central rotary rock grab (HZ type), circular track rock grab (HH type) and wall-type rock grab (HK) type). The center rotary rock grab is common.

(2) Enhancing work

The task of upgrading work is to eliminate the meteorites in the wellbore, the equipment and equipment, and the lifting staff.

(3) Drainage work

After the underground meteorite is lifted by the bucket to the derrick on the ground derrick, the gangue is discharged by the turning device, and the gangue is discharged into the car or the mine car through the shovel or the gangue. Then it is transported to the drainage site.

PVC Resin

PVC Resin is easy to process, and can be processed by molding, lamination, injection molding, extrusion, calendering, blow molding and other hollow methods. Polyvinyl chloride is mainly used to produce artificial leather, film, wire sheath and other plastic soft products, but also can produce plates, doors and windows, pipes and valves and other plastic hard products.

PVC Resin usually inculde carbide based and ethylene based. K66-K68 PVC RESIN, K59-K55 PVC RESIN, K71-K73 PVC RESIN. PVC RESIN SG5, PVC RESIN SG3, PVC RESIN SG8.

According to the different application scope, PVC can be divided into: general-purpose PVC resin, high polymerization degree PVC resin, and cross-linked PVC resin. General-purpose PVC resin is formed by the polymerization of vinyl chloride monomer under the action of initiator; high degree of polymerization PVC resin refers to the resin polymerized by adding chain extender to the vinyl chloride monomer polymerization system; cross-linked PVC resin is A resin polymerized by adding a crosslinking agent containing diene and polyene to the vinyl chloride monomer polymerization system.
According to the method of obtaining vinyl chloride monomer, it can be divided into Calcium Carbide method, ethylene method and imported (EDC, VCM) monomer method (the ethylene method and imported monomer method are commonly referred to as ethylene method).
According to the polymerization method, polyvinyl chloride can be divided into four categories: suspension polyvinyl chloride, emulsion polyvinyl chloride, bulk polyvinyl chloride, and solution polyvinyl chloride. Suspension process polyvinyl chloride is the largest variety in output, accounting for about 80% of the total output of PVC. Suspension method PVC is divided into six models according to absolute viscosity: XS-1, XS-2--XS-6; XJ-1, XJ-2--, XJ-6. The meaning of each letter in the model: X-suspension method; S-loose type; J-compact type.

Pvc Resin,Pvc Resin Powder,Pvc Resin Sg5,Pvc Resin K67

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