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 DJB metal hinged roof beams: metal roof beam with single metal pillar with the composition of various types of metal stents for the horizontal and gently inclined coal mining face support a roof beam high-intensity beam to the top of the cantilever that supporting face, the front wall of the transport channel of coal above the roof, walls and pillars of coal between the greater support space. As shown: (1) Double wedge beam, (2) DJC type top beam, (3) DJA-type roof beam, (4) DJB-type roof beam. Model center distance () each take a long root of the number of allowable beam bending moment (), licensed by the Ministry hinge bending moment () of the adjustment angle (.) Weight up and down about DJA-800 800 1 - 2 43.7 20.00 ≥ 7 ≥ 3 20.32 DJA-1000 1000 1 - 2 43.7 20.00 ≥ 7 ≥ 3 23.86 DJA-1200 1200 1 43.7 20.00 ≥ 7 ≥ 3 27.40 DJB-800 800 1 - 2 52.5 30.00 ≥ 7 ≥ 3 22.88 DJB-1000 1000 1 - 2 52.5 30.00 ≥ 7 ≥ 3 26.90 DJB-1200 1200 1 52.5 30.00 ≥ 7 ≥ 3 30.92 DJC-800 800 1 - 2 35 18.00 ≥ 7 ≥ 3 17.36 DJC-1000 1000 1 - 2 35 18.00 ≥ 7 ≥ 3 20.69 DJC-1200 1200 1 35 18.00 ≥ 7 ≥ 3 24.02 -800 800 1 - 2 43.7 20.00 ≥ 7 ≥ 3 21.66 -1000 1000 1 - 2 43.7 20.00 ≥ 7 ≥ 3 25.41 -1200 1200 1 43.7 20.00 ≥ 7 ≥ 3 29.16 Implementation of the standards: MT30-2000 
 1) electric hoist: CD1, MD1 model wire rope electric hoist; SH series wire rope electric hoist; suspended wire rope hoist; SHA-type electric hoist; HHXG type electric chain hoist; Micro (civil) electric hoist. 
 2) lever hoist: NHSS series of wire rope pulling hoist; HSH-A 619,623 series lever hoist. 
 3) chain hoists: combination of chain hoists; HSZ-A 610,618 series chain hoists; HS-VT chain hoist HS-C-type hand chain hoist. 
 2. Jack Series 
 Horizontal hydraulic jack; extended heavy horizontal jack; vertical hydraulic jack; double vertical hydraulic jack; separate hydraulic jack; pneumatic hydraulic jack; screw jack; mechanical jacks; scissor jack; electric scissor jack; claw jack; handling of small tanks, the security holder. 
 3. Roadster Series 
 GCL Series TROLLEYS; GCL Series TROLLEYS; electric sports car; manual sports car. 
 4. Lifting hanging clamp series 
 Various vertical plate clamp (clamp vertical lifting weight), various levels of steel clamp (clamp horizontal lifting heavy, flat weight lifting clamp), JG rail clamp. 
 Contact: Manager Cao 
 Phone: 
 Wang No.: zhongmeijx13 
 QQ: 62 
 Mountain Equipment Co., Ltd. Jining in the Coal Mine 
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