Please select the most similar patent number from A, B, C and D. Which number is?
Disclosed is a direct-current, double-support and ultra-fine ring roller grinder, comprising a grinding host, wherein a host shell (1) of the grinding host is arranged on a host base (3); a grinding roller (9) and grinding rings (12, 13) mated with each other are arranged in the host shell (1); the grinding roller is arranged on a grinding roller support (10, 11), and the grinding roller support is arranged on a main shaft (2); a lower end of the main shaft (2) is mounted in a double-support manner through upper and lower bearing positions (4,7) on an upper host cover (6) and the host base (3); a negative-pressure gas port (5) is formed on the host base (3); the grinding rings are directly mounted and connected to the host shell in a non-spaced manner; and the gas port communicates with a graded conveying pipe outside the grinding host. The grinding host of the ring roller grinder uses a structure with feeding from the top and suction from the bottom, which is not restricted by the grading amount of the grading device, and prevents the discharging materials from leaking outside; thus, the grinding efficiency is improved, mechanical collision and abrasion between the grinding roller and the grinding ring are reduced, and the grinding host has a low noise level.
A: Disclosed is a roller mill, which comprises: a shell (10), the shell (10) being provided with a feed port (11) and a discharge port (12); a main shaft (20) which is provided in the shell (10) rotatably in a penetrating manner; a drive device (30) which is connected to the main shaft (20) in a driving manner; a bracket (40) which is installed on the main shaft (20); two or more than two grinding rollers (50), each of the grinding rollers (50) is rotatably installed on the bracket (40) around a shaft axis thereof; and a grinding disk (60) which is fixedly installed in the shell (10) and is opposite to the positions of the plurality of grinding rollers (50). The roller mill also comprises an axial position adjustment device (70) which is connected to the main shaft (20) and is used for driving the main shaft (20) to move in an axial direction so as to adjust the position of the main shaft (20). The roller mill has a simple structure and can adjust a rolling gap conveniently.
B: A driving recorder, comprising a main body (1) used for photographing a scene outside of a vehicle, wherein the main body (1) comprises a main body casing (11); the main body casing (11) comprises a main body lower cover (111) and a main body upper cover (112) covering the main body lower cover (111); the main body (1) further comprises a mounting cover (15) detachably connected to the main body upper cover (112), and one side of the mounting cover (15) is provided with an adhesive member (16) used for fixedly connecting to a windshield (3). The main body casing (11) and the mounting cover (15) of the driving recorder are detachable, and the mounting cover (15) is fixedly connected to the windshield (3) by means of the adhesive member (16), so that the main body (1) and the windshield (3) are connected more stably. Meanwhile, when components in the main body casing (11) are maintained and replaced later on, it is only necessary to remove the main body casing (11) from the mounting cover (15) without damaging the adhesive member, which reduces the difficulty in disassembling the main body (1).
C: A coal grinding device for a thermal power system of a power plant comprises a housing (4), a coal inlet and outlet mechanism disposed above the housing (4), a first driving mechanism disposed below the housing (4), and a grinding mechanism and a second driving mechanism both disposed in the housing (4). Both the first driving mechanism and the second driving mechanism are in transmission connection with the grinding mechanism. In the coal grinding device for a thermal power system of a power plant, a curved surface is disposed on one side of each auxiliary grinding plate (22) close to each first grinding roller (19), so that the grinding area of the first grinding rollers (19) and the auxiliary grinding plates (22) can be greatly increased, thereby improving the grinding efficiency of the device. In addition, a plurality of second grinding rollers (21) is disposed at the bottom of each first grinding roller (19), so that grinding is carried between the second grinding rollers (21) and the grinding discs, so as to fully grind coal briquettes, thereby improving the grinding reliability.
D: Disclosed a prepreg sizing roll shaft spraying complete machine. The complete machine comprises a main machine base (b1) and a coating mechanism arranged on the main machine base (b1); the complete machine further comprises a feeding structure for performing feeding and an iron powder supply device for absorbing iron powder; a supporting rod (b2) for the installation of the feeding structure is arranged on the main machine base (b1); and the complete machine also comprises an iron powder recycling box (b3) arranged below the iron powder supply device. The prepreg sizing roll shaft spraying complete machine uses automatic control, a very efficient novel roller shaft manufacturing manner is achieved, the finished product yield is high, and the effect is good.
Answer: A