CN-121988705-A - Stream inoculation device with pure mechanical structure

CN121988705ACN 121988705 ACN121988705 ACN 121988705ACN-121988705-A

Abstract

The invention discloses a stream inoculation device with a pure mechanical structure, relates to the field of metal casting, and aims to solve the problems of high-temperature failure, poor suitability and uneven mixing of an electric control part of the conventional device. The device comprises a frame body, a hopper, a control rod, a cover plate, a balancing weight and a self-excitation roller, wherein the frame body is fixedly arranged in the tapping channel, the hopper is in running fit with the frame body through a hinge shaft, and the balancing weight realizes that the cover plate is automatically closed and the hopper is vertically stable when the furnace body is tilted. The self-exciting roller adopts silicon nitride-calcium fluoride ceramic matrix composite material, and is matched with the guide plate to realize uniform and quantitative conveying of inoculant, and the flow rate of molten iron can be self-adapted. The device does not need electric control, is high-temperature resistant and low in maintenance cost, can be directly connected into the existing production line, effectively improves the mixing effect of inoculant and molten iron, and reduces inoculation decay.

Inventors

He Chengting
WANG HONGYI
WANG DESHENG
CHEN WENLIN
QIN XUTAO
WU QIUYING

Assignees

山东隆基机械股份有限公司
山东隆基环保科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260409

Claims (10)

1. The stream inoculation device with a pure mechanical structure comprises a frame body (1) and a hopper (2), and is characterized in that, The frame body (1) is fixedly arranged on the tapping channel close to the furnace body, and two hinge holes (11) which are axially horizontal and coaxial are formed in the frame body (1); The hopper (2) is used for containing inoculant, is in a cone shape with a large upper end and a small lower end, two hinge shafts (21) which are axially horizontal and coaxial are fixedly arranged on the outer wall of the hopper (2) close to the top, and the two hinge shafts (21) are respectively in running fit with the two hinge holes (11), a hinge support (22) is fixedly arranged on the cylinder wall of the hopper (2) close to the lower end, the lower end of the hopper (2) is a discharging section (23) with a rectangular section, and the lower end of the discharging section (23) is a planar open port; Further comprises: the control rod (3) is rotationally connected with the hopper (2) through the hinged support (22), the lower end of the control rod (3) extends to the lower open end of the discharging section (23), and the upper end of the control rod exceeds the upper end of the hopper (2); The cover plate (4) is fixedly connected with the lower end of the operating rod (3), the outline of the cover plate (4) is larger than the inner outline of the discharging section (23), and the cover plate is suitably matched with the planar open port of the discharging section (23); the driving rope (5) is connected with the upper end of the control rod (3), and the cover plate (4) can be separated from the plane-shaped opening port of the discharging section (23) by remotely pulling the upper end of the control rod (3); The balancing weight (6) is fixedly arranged above the corresponding hinged support (22) on the control rod (3) and below the hinged shaft (21), the gravity center of the balancing weight (6) is always located at the outer side of a hinged point of the control rod (3) and the hinged support (22), the balancing weight (6) can enable the whole gravity center of the hopper (2) to move downwards, and when the driving rope (5) does not exert tension, the driving cover plate (4) always keeps a covering state of a planar open port of the discharging section (23).
2. The stream inoculation device with the pure mechanical structure according to claim 1, wherein a half-width area is cut upwards along one side of a planar open port of the discharging section (23) to form a lateral open notch (24), and an arc transition surface is arranged at an inner side internal angle of the lateral open notch (24); The self-exciting roller (7) is made of silicon nitride-calcium fluoride ceramic matrix composite material, the diameter of the self-exciting roller (7) is not larger than the height of the lateral opening gap (24), the self-exciting roller (7) comprises a roller body (71), the roller body (71) is in clearance fit with the inner cavity of the discharging section (23), two ends of the roller body (71) respectively extend outwards to form conical slag guide parts (72) with small outer end diameter and large inner end diameter, the center of the outer end of each conical slag guide part (72) is inwards recessed to form a blind hole type rotating cavity (73), and the conical slag guide parts (72) are in clearance fit with the arc transition surfaces of the lateral opening gap (24); The rotary pin type roller comprises a roller body (71) and is characterized by further comprising two floating plates (74), wherein the two floating plates (74) are obliquely arranged towards the inner lower side of the discharging section (23), the upper ends of the two floating plates are respectively hinged to the side walls of the discharging section (23) corresponding to the two ends of the roller body (71), the inner side surfaces of the two floating plates (74) are respectively fixedly provided with a rotary pin (75) made of silicon nitride-calcium fluoride ceramic matrix composite material, the inner ends of the rotary pins (75) are provided with hemispherical matching surfaces, and the rotary pins (75) and the blind hole type rotary cavity (73) form rotary fit.
3. The stream inoculation device with the pure mechanical structure according to claim 2 is characterized in that a guide plate (8) is fixedly arranged in an inner cavity of the discharging section (23) and corresponds to an upper area of the self-exciting roller (7), the guide plate (8) is not contacted with the outer surface of the roller body (71) of the self-exciting roller (7), and the guide plate (8) is arranged in a downward inclination manner along the circumferential direction of the self-exciting roller (7) from one side far away from the roller body (71) of the self-exciting roller (7) to one side close to the roller body (71).
4. Stream inoculation device of pure mechanical structure according to claim 2, wherein the outer circumferential surface of the roller body (71) is uniformly distributed with a plurality of hemispherical pits (711) in an array in circumferential and axial directions.
5. Stream inoculation device of pure mechanical structure according to claim 2, characterized in that the mass fraction of calcium fluoride in the self-exciting roller (7) is 5-15% and the mass fraction of calcium fluoride in the rotating pin (75) is 8-12%.
6. The stream inoculation device with the pure mechanical structure according to claim 2 is characterized in that silicon carbide particles with the mass fraction of 2-5% are added into the ceramic matrix composite material of the self-exciting roller (7), and the silicon carbide particles are uniformly dispersed in a silicon nitride matrix.
7. The stream inoculation device with a pure mechanical structure according to claim 2, wherein the outer circumferential surface of the roller body (71) is subjected to plasma spraying treatment to form a silicon nitride-calcium fluoride composite coating with the thickness of 50-100 μm, and the surface roughness Ra of the coating is less than or equal to 0.8 μm.
8. Stream inoculation device of purely mechanical construction according to claim 1, wherein the axis of the hinge support (22) is arranged in a spatially non-parallel manner with respect to the axis of the hinge shaft (21) with a non-zero angle therebetween.
9. The stream inoculation device with a pure mechanical structure according to claim 1, wherein a plurality of sections of spiral ribs are arranged on the inner wall of the cone of the hopper (2) at intervals along the circumferential direction, and the spiral ribs extend downwards along the axial direction of the hopper (2).
10. The stream inoculation device with the pure mechanical structure according to claim 1, wherein an inclined support structure is not arranged on one side of the frame body (1) close to the furnace body, the distance between the hopper (2) and the furnace body is reduced, and inoculant in the hopper (2) is activated by high-temperature radiation of the furnace body and the tapping groove.

Description

Stream inoculation device with pure mechanical structure Technical Field The invention relates to the technical field of metal casting, in particular to a stream inoculation device with a pure mechanical structure. Background Stream inoculation is a key process for improving the tissue uniformity of castings and inhibiting the white defects in cast iron production, and is characterized in that inoculants are synchronously added in the process of molten iron flow, and uniform dispersion of the inoculants is realized through dynamic mixing, so that the inoculation degradation effect is reduced, and the number of graphite nodules and the performance of castings are improved. The automatic stream inoculation device and the automatic stream inoculation method for tapping iron of the electric furnace disclosed in publication number WO2016/004834A1 feed back the weight of the residual molten iron in the furnace in real time through a molten iron weighing system, calculate the flow rate of the molten iron through a control system, drive a variable frequency motor to screw and convey and adjust the flow rate of inoculant, and adjust the angle of a feeding pipe by means of a worm gear mechanism so as to adapt to the change of the arc of the molten iron flow. In actual production, however, most of the existing electric furnaces are not preset with weighing interfaces, the electric furnace body is huge, the whole weight reaches hundreds of tons, a furnace body supporting structure is needed to be modified when a weighing system is additionally arranged, the existing electric furnaces are difficult to directly adapt, meanwhile, electric control components such as a variable frequency motor for driving spiral conveying, a worm and gear driving motor for adjusting the angle of a feeding pipe and the like can quickly cause ageing of a motor insulating layer and carbonization of bearing grease due to heat radiation in a high-temperature environment of 800-1200 ℃ around the electric furnaces and a tapping chute, and maintenance frequency and cost are obviously increased. The intelligent stream inoculation device and the stream inoculation method disclosed in publication No. CN112045153A are characterized in that an inoculation funnel is arranged on one side of a ladle nozzle of a casting ladle through a support frame, a gate valve is controlled to be opened and closed by a push rod motor, and remote start-stop and alarm are realized through linkage of a Bluetooth module and a smart phone. However, the inoculant is added after the molten iron flows out of the ladle nozzle, the flowing path of the molten iron is only from the ladle nozzle to the pouring cup, the distance is generally less than 30cm, the flowing time is only 1-2 seconds, the fluctuation of the flow speed of the molten iron is large under the influence of the force of rotating a handle of an operator when the ladle is poured, the inoculant is difficult to form effective turbulent flow mixing with the molten iron, the inoculant is easy to agglomerate or partially accumulate on the surface of the molten iron, and the requirement of uniform dispersion along with stream inoculation cannot be met. Although the push rod motor winding and the Bluetooth module are both arranged in the iron box filled with the heat insulation material, the heat conduction and radiation heat can gradually penetrate through the heat insulation layer, and the problems of aging of the motor insulation layer, carbonization of bearing grease and failure of electronic components of the Bluetooth module still occur. Disclosure of Invention In order to overcome the defects or one of the defects in the prior art, the invention provides a stream inoculation device with a pure mechanical structure, which comprises the following specific technical scheme: The stream inoculation device with a pure mechanical structure comprises a frame body and a hopper, wherein the frame body is fixedly arranged on a tapping channel close to a furnace body, and two hinge holes which are axially horizontal and coaxial are formed in the frame body; the hopper is used for containing inoculant and is in a cone shape with a large upper end and a small lower end, two hinge shafts which are axially horizontal and coaxial are fixedly arranged on the outer wall of the hopper close to the top, and the two hinge shafts are respectively in running fit with the two hinge holes; Further comprises: The control rod is rotationally connected with the hopper through the hinged support, the lower end of the control rod extends to the lower open end of the discharging section, and the upper end of the control rod exceeds the upper end of the hopper; The cover plate is fixedly connected with the lower end of the operating rod, the outline of the cover plate is larger than the inner outline of the discharging section, and the cover plate is suitably matched with the planar open port of the discharging section; The driving rope is connecte