Please select the most similar patent number from A, B, C and D. Which number is?
A coal discharge wheel for use in an air dry sand coal sorting system, comprising a base plate (1), a drive apparatus, and a conveying apparatus used for conveying coal blocks. Side plates (2) are fixedly connected around the periphery of the base plate, the combination of the base plate and the side plates forming a sorting chamber (3), a rotating shaft (4) being rotatably connected between two opposite side walls on the base plate, the rotating shaft penetrating out of the side plates and having a transmission connection to the drive apparatus, a plurality of coal discharge sieves (5) being distributed uniformly on the rotating shaft along the circumferential direction of the rotating shaft, the coal discharge sieves comprising a plurality of coal discharge rods (6), the rotation of the rotating shaft driving the coal discharge rods to rotate along the circumferential direction of the rotating shaft, the rotation range of the coal discharge rods being less than the width of the rotating shaft between the two side plates on both sides of the rotating shaft, and the conveying apparatus being in communication with the side plates on both sides of the rotating shaft. The present coal discharge wheel has the advantages of a low failure rate, high coal block sorting efficiency, and low dielectric loss, thereby saving costs and increasing working efficiency.
A: An automatic feeding and conveying apparatus for a laser pipe-cutting machine, comprising a machine frame (1), a plurality of conveying mechanisms (2) connected in parallel being mounted on the machine frame (1), a cylinder (3) mounted on the machine rack (1) being disposed between the conveying mechanisms (2), a blocking rod (4) being disposed on the upper end of the piston rod of the cylinder (3), the conveying mechanisms (2) comprising a chain group A and a chain group B arranged in parallel, the chain group A being connected together by means of a transmission shaft A (5) and the chain group B being connected together by means of a transmission shaft B (6), the transmission shaft A (5) being positioned in front of the transmission shaft B (6), a servo motor A (7) for driving the rotation of the transmission shaft A (5) and a servo motor B (8) for driving the rotation of the transmission shaft B (6) being disposed in the machine frame (1), a conveyor belt (9) being disposed between the conveying mechanisms (2), and the blocking rod (4) being positioned between the front ends of the chain group B. The apparatus has a simple structure, stable operation, and high working efficiency, reducing staff labour intensity; using said structure can effectively ensure that one pipe enters a material carrying apparatus, preventing pipes from overlapping.
B: A delivery device, comprising: a base (1), a roller component (2), a transmission shaft (3), and a driving unit (4). The roller component (2) comprises multiple delivery wheels (21) that are coaxially provided, multiple lead screws (22), and multiple lead screw motors (23) connected to the multiple lead screws (22) in a one-to-one correspondence manner. Each delivery wheel (21) is provided with a threaded hole (211), and is in a connection fit with a corresponding lead screw (22) by means of the threaded hole (211) thereon, so that the corresponding delivery wheel (21) is controlled to move along an axial direction. The transmission shaft (3) is rotatably connected to the base (1). The transmission shaft (3) is fixedly connected to the roller component (2). The driving unit (4) is configured to drive rotation of the transmission shaft (3). The transmission shaft (3) drives the lead screw motors (23) to simultaneously rotate, thereby driving the roller component (2) to rotate about the axis of the transmission shaft (3). Also disclosed is a delivery method of the delivery device. By controlling delivery wheels (21) to move along an axial direction, defective products due to wheel imprints left during product transport can be avoided.
C: Disclosed is a portable barbecue grill, comprising a polygonal frame, side plates, and a bottom plate (3), wherein upper edges of the side plates are rotatably connected to corresponding sides of the polygonal frame; the bottom plate (3) is provided with four bayonets (31), and the four bayonets (31) form two bayonet pairs, one of which is slidably connected to side edges of two sides of any one of the side plates, and the other of which is slidably connected to side edges of two sides of a target side plate; and lower edges of other side plates, other than the attached side plates, are located on an upper side of the bottom plate (3). By means of improving the structure of a conventional barbecue grill and the connection relationship between parts of a conventional barbecue grill, a grill body is divided into the polygonal frame, the side plates and the bottom plate (3), the side plates are rotatably connected to the polygonal frame, and the attached side plates are slidably connected to the bottom plate (3), thereby achieving rapid folding or unfolding without parts being lost and convenient carrying.
D: A sieving and gangue discharging apparatus on a gangue discharging system for a coal cleaning system employing air and dry sand, comprising a separation chamber (10), a bottom sieving layer (20), a side sieving layer (30) and gangue discharging claws (40). The bottom sieving layer is fixedly disposed in the separation chamber. One end of the side sieving layer is fixed to the inner wall of the separation chamber, and the other end thereof is fixedly connected to the bottom sieving layer. The gangue discharging claws are disposed in falling and sieving seams of the bottom sieving layer, and the end portions thereof are exposed out of the upper end face of the bottom sieving layer. The bottom sieving layer is formed by a plurality of first sieving bars (21) which are distributed in the separation chamber uniformly. Falling and sieving seams (22) are formed among the adjacent first sieving bars. The side sieving layer is formed by a plurality of second sieving bars (31). The second sieving bars have a certain slope relative to the bottom sieving layer. Falling and sieving seams are formed among the adjacent second sieving bars, and the width thereof is the same as that of the falling and sieving seams on the bottom sieving layer. Moving seats (41) are provided on the bottom portions of the gangue discharging claws for controlling the gangue discharging claws to move on the bottom sieving layer. A gangue discharging opening is formed at one side of the separation chamber and is in communication with the bottom sieving layer. The apparatus enables convenient sieving, the equipment is not damaged thereby easily, and the sieving efficiency is improved.
Answer: D