Please select the most similar patent number from A, B, C and D. Which number is?
A vacuum drying apparatus, comprising a drying tank (11), agitation shafts (12), and an agitation motor (14). Agitation blades (16) are provided on the agitation shafts (12). Both ends of the agitation shafts (12) are separately and fixedly connected to the drying tank (11) by means of bearings and bearing seats, and the agitation shafts (12) are connected to the agitation motor (14). A heating element is provided inside an intermediate layer between an inner layer and an outer layer of the drying tank (11). The drying tank (11) consists of a lower centrally-split tank body and an upper centrally-split tank body, said lower and upper tank bodies being sealed and fixedly connected by means of a sealing ring and fixing bolts. A hollow cavity is provided inside the lower centrally-split tank body, the hollow cavity being provided with an electric heating device and a heat-conducting medium. The electric heating device is controlled by a control system, and the heat-conducting medium is in communication with a vacuum waste heat recovery apparatus. The present vacuum drying apparatus features a novel structure, stable operation, convenient replacement, high working efficiency, and a long service life.
A: A pre-mixing device for a chemical reactor, comprising a pre-processing tank (6); a stirring assembly (1) is provided at the upper portion of the pre-processing tank (6), a discharging pipe (2) is provided at one side of the lower portion of the pre-processing tank (6), and a supporting frame (3) is provided at the middle portion of the pre-processing tank (6); the stirring assembly (1) comprises a stirring shaft (15), the stirring shaft (15) is rotatably provided at the inner middle portion of the pre-processing tank (6), the upper end of the stirring shaft (15) is connected to a driving shaft of a stirring motor (14) by means of a coupling, the stirring motor (14) is mounted at a top position of the pre-processing tank (6), stirring blades (13) are provided at the upper portion of the stirring shaft (15), connecting rods (157) are provided at the lower portion of the stirring shaft (15), a ball bearing (158) is fixed at one end of each of the connecting rods (157), auxiliary rotating shafts (155) are inserted in the ball bearings (158), gears (156) are fixed on the auxiliary rotating shafts (155), the gears (156) engage with a ring gear (153) by means of the gears (156), the ring gear (153) is fixed on a support (154), the support (154) is fixed at the lower portion of the inner wall of the pre-processing tank (6), and the auxiliary rotating shafts (155) are provided with auxiliary blades (151).
B: A high-efficiency sludge treatment apparatus, related to the technical field of sludge treatment, comprising a sludge treating housing (1) and a fixed base (11) provided at the underside of the sludge treating housing (1). A stirring electric motor (5) is fixedly mounted on the right side of the sludge treating housing (1). An output end of the stirring electric motor (5) is fixedly connected to a stirring shaft (501). Stirring rods (502) are fixedly provided at an interval on the surface of the stirring shaft (501). A material inlet pipe (4) is fixedly provided at the middle of the upper end of the sludge treating housing (1). A hot air blower (27) is fixedly mounted at the upper end of the sludge treating housing (1) on the side in proximity to the material inlet pipe (4). With sludge undergoing a tiered multilayered filtration treatment via a tier-one filter layer (15) and a tier-two filter layer (16), tiered classification and collection of the sludge are implemented, high-temperature hot air produced by the hot air blower (27) is capable of performing a drying and sterilization treatment with respect to the sludge, the stirring rods (502) and stirring blades (503) are capable of stirring and flipping the sludge in the sludge treating housing (1) so that effects of the drying and sterilization treatment of the sludge are uniform and full, thus increasing the work efficiency of a sludge treatment.
C: A vacuum drying device and method for a panel substrate after cleaning, the device comprising a pre-dehydration system and a vacuum drying system. A transfer conveying device is arranged between the pre-dehydration system and the vacuum drying system and is used for connecting the pre-dehydration system and the vacuum drying system in series and conveying a product to be dried; the pre-dehydration system comprises a water tank, a circulating pump and a heater, wherein the water tank is connected to the heater, which is arranged externally, by means of the circulating pump and is used for adjusting the temperature of the water in the water tank; and the vacuum drying system comprises a static charge eliminating device, a drying chamber, a nitrogen gas source, a heating cavity, a condenser, a temperature controller, an infrared heater and a vacuum pump, wherein the nitrogen gas source is heated by means of the heating cavity, then is led into the static charge eliminating device and then is sent into an air inlet of the vacuum pump, the infrared heater is arranged in the drying chamber, one end of the condenser is connected to an air outlet of the drying chamber, the other end of the condenser is connected to the vacuum pump, and the infrared heater and the condenser are both connected to the temperature controller to adjust the chamber temperature of the drying chamber.
D: An efficient crushing feed hopper comprising a feed hopper (1), wherein a cover plate (2) is arranged at an upper end of the feed hopper (1); a longitudinal stirring electric motor (3) is arranged at an upper end of the cover plate (2); a stirring shaft (4) is arranged at a lower end of the longitudinal stirring electric motor (3) and located in the feed hopper (1); an auger delivery piece (5) is mounted on the stirring shaft (4); the feed hopper (1) has an upper portion in the shape of a cylinder and a lower portion in the shape of an inverted cone; a rotating shaft (6) is arranged below the stirring shaft (4) and located in the feed hopper (1); stirring blades (7) are mounted on the rotating shaft (6); the rotating shaft (6) is movably connected to a side wall of the feed hopper (1) via a bearing seat; a transverse stirring electric motor (8) is connected to an outer end of the rotating shaft (6); the transverse stirring electric motor (8) is fixedly mounted on the side wall of the feed hopper (1); a discharge tube (9) is arranged at a lower end of the feed hopper (1); and a feed port (13) is provided on the cover plate (2). By adding a longitudinally arranged stirring shaft and a transversely arranged rotating shaft in a feed hopper, agglomerate materials in the feed hopper can be double stirred, thereby ensuring sufficient crushing of the agglomerate materials, effectively preventing the materials from blocking the feed hopper and lengthening the usage life of the feed hopper.
Answer: C