Promotion and Application of Equipment for Metal and Non-Metallic Mines
Release time:
2020-09-25
The roof bolting cart is a mechanized device specifically designed to remove loose and unstable rock fragments from the roof and sidewalls of mining sites. During underground mining operations, after blasting, the rock mass becomes loosened due to the impact of various forces acting upon it, rendering the rock at the top and sides of tunnels unstable. It is essential to promptly clear these unstable rock fragments during the mining cycle; otherwise, there is a constant risk that loose rocks and debris could fall at any time, posing a serious threat to the safety of on-site workers and equipment.
The roof bolting car is a mechanized device specifically designed to remove fractured and unstable loose rocks from the roof and sidewalls of the working face.
During underground mining operations, after blasting, the rock mass becomes loosened due to the impact of various forces acting upon it. As a result, the rock at the roof and sides of tunnels becomes unstable. In the mining cycle, it is essential to promptly remove this loose rock; otherwise, the unstable loose rocks and boulders could fall at any time, posing a serious threat to the safety of both workers and equipment on site. Currently, there are two main methods for removing loose rock: one is manual rock prying, in which workers use hand tools to pry loose the rock manually. This method is extremely labor-intensive, highly strenuous, inefficient, and dangerous. The work site is filled with airborne dust, and flying debris as well as sudden rock falls can easily cause injuries or fatalities among workers. Moreover, limited by human manpower, the removal of loose rock is sometimes incomplete, leaving hidden hazards that could lead to accidents. The other method involves using rock-prying carts, which enable mechanized rock prying. These rock-prying carts are equipped with mobility features, making them highly maneuverable and flexible. Operators sit in a cab to control and position the cart, as well as to perform the prying and impact operations, ensuring high safety and efficiency. Rock-prying carts first originated abroad; however, in recent years, domestic enterprises have undertaken research and development on these carts, creating prototype models based on different chassis systems and subsequently promoting their widespread adoption.
The rock-bolting trolley our company has developed, as shown in the figure, is suitable for rock-bolting operations and roof-and-side-roof inspection tasks in underground mining of both metallic and non-metallic ores, as well as in various underground excavation projects and tunnels. It can quickly and effectively remove unstable rocks from the roof and sides of working faces that are prone to falling or collapsing after blasting, thereby preventing roof falls and side collapses, and ensuring the safety of personnel and equipment at the work site. 
This product consists of the following 8 parts:
Part One: The Working Mechanism—comprising the working arm and hammer head—primarily serves to position the hydraulic hammer at the appropriate height and ensure an optimal chipping angle. The chipping trolley’s working mechanism is highly flexible; the movement of the impact hammer is controlled by a rotary cylinder and a linear telescopic cylinder, enabling 360° operation without any blind spots. The support structure of the boom adopts a parallelogram linkage mechanism, which allows the working arm to maintain a constant and stable angle while moving back and forth in low-ceiling tunnels. The working arm of the chipping trolley features both pitch-and-roll functions as well as telescoping capability. This not only guarantees the trolley’s effective working height for hazard removal but also ensures its smooth passage through narrow tunnels. The hammer head can swing 180° in all directions—up, down, left, and right. Such a design enables the hammer tip to strike the pumice stone from various angles, quickly identifying and effectively breaking through its weakest points.
Part Two: Leg Support and Bulldozer Blade Assembly. The bulldozer blade is primarily used to clear obstacles such as gravel and other debris during the trolley’s operation. It can be freely raised and lowered according to road conditions. The leg support mechanism is designed to stabilize the vehicle body. Each leg is supported by a dual-cylinder system, and the coordinated action of the two front support legs with the rear wheels ensures stable vehicle positioning. This mechanism not only effectively stabilizes the vehicle but also allows for rapid retraction of the legs and swift evacuation from the site in emergency situations.
Part 3: Chassis Section—The trolley’s chassis adopts a front-and-rear frame hinged design, which minimizes the trolley’s turning radius to the greatest extent. The axle assembly features the latest normally-closed, pressure-loss-protected, fully-sealed wet brakes, ensuring that the trolley will automatically brake in the event of a sudden pressure loss—for example, if the brake fluid line ruptures—thereby maximizing the safety of both personnel and equipment.
Part Four: Cab—The cab structure of the trolley is highly robust and has been certified according to the globally recognized FOPS and ROPS standards, providing effective protection for the operator. The trolley’s cab is capable of both lifting and tilting movements; this design allows the operator to adjust their line of sight, making it easier to monitor the debarking operations. Some trolleys feature a cab roof-lifting function, with the roof able to be lowered as low as 1.3 meters, facilitating passage through low-ceilinged tunnels.
Part 5: The Transmission System. The primary function of the transmission system is to provide and transmit power to the trolley. The trolley is equipped with an imported Cummins engine, which boasts stable performance, powerful output, and meets the China Stage III emission standards, thereby ensuring high air quality in underground working environments. The trolley’s power transmission is achieved via a hydraulic torque converter and a gearbox, delivering sufficient torque to enable the trolley to climb a 25° slope even under the harshest underground road conditions. It can essentially handle operations and travel smoothly through various types of tunnels and巷道.
Part Six: Hydraulic System—The hydraulic system primarily serves to manipulate and control the vehicle. Most of the hydraulic components used in the trolley are imported, boasting excellent performance and a long service life. All control levers are arranged in accordance with ergonomic principles, maximizing convenience for the operator. Safety valves and pressure gauges have been installed in all major oil lines to ensure that the trolley always operates at the set system pressure, thereby effectively safeguarding both equipment and personnel safety.
Section 7: Electrical System. The electrical system is primarily responsible for controlling the vehicle’s entire circuitry, including the vehicle’s lighting, alarm indicators, engine data display, and control of certain solenoid valves. All electrical components and wiring used in the trolley are designed with excellent waterproof performance, achieving an IP65 rating to ensure that the trolley can operate normally even in the damp underground environment.
Part 8: The water-spraying system serves two purposes: first, it removes dust generated during the trolley’s operation to ensure clear visibility; second, it is used for cleaning and maintaining the trolley.
Our company’s developed scraper-type mine car products have been successfully implemented and applied at the following entities: Nanjing Meishan Metallurgical Development Co., Ltd. Mining Branch of Baosteel Group, Guizhou Branch of China Aluminum Corporation, Shandong Mining Co., Ltd. of China Steel Group, Shimeng Iron Ore Mine of Jinan Iron & Steel Group Corporation, Hebei Iron & Steel Group Mining Co., Ltd., Tonglüshan Mine of Daye Nonferrous Metals Co., Ltd., Fengshan Copper Mine of Daye Nonferrous Metals Co., Ltd., Shandong Huibaoling Iron Ore Co., Ltd., Hunan Shizhuyuan Nonferrous Metals Co., Ltd., and Xinyu Iron & Steel Group Co., Ltd.
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