CN111229132A - Improved metering and distributing device for fine powder catalyst - Google Patents
Improved metering and distributing device for fine powder catalyst Download PDFInfo
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- CN111229132A CN111229132A CN202010112334.3A CN202010112334A CN111229132A CN 111229132 A CN111229132 A CN 111229132A CN 202010112334 A CN202010112334 A CN 202010112334A CN 111229132 A CN111229132 A CN 111229132A
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- flange
- metering
- driving shaft
- disc
- catalyst
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/0015—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor
- B01J8/002—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor with a moving instrument
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/001—Feed or outlet devices as such, e.g. feeding tubes
- B01J4/007—Feed or outlet devices as such, e.g. feeding tubes provided with moving parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/02—Feed or outlet devices; Feed or outlet control devices for feeding measured, i.e. prescribed quantities of reagents
Abstract
The utility model provides an improved fine powder form catalyst measurement dosing unit, belongs to machinery, includes middle part flange, bottom flange, filter equipment, spiral agitator, metering element, unloading subassembly, drive shaft, axle supporting component, drive arrangement. Middle part flange device is on bottom flange upper portion, and the bottom flange is split type structure, and filter equipment arranges in middle part flange upper portion, and the spiral agitator is supported and drives rotatoryly by the driveshaft, and its inside centre bore that is equipped with, measurement subassembly from the top down arranges floating cover plate, floating disc, measurement dish, wear-resisting dish in proper order, and the unloading subassembly comprises copper lantern ring, packing, self-aligning bearing, elastic coupling by flange body support shaft subassembly. The invention has compact structure, and reduces the processing difficulty of the bottom flange of a key part while realizing the accurate measurement of the fine powder catalyst. In addition, the influence of the coaxiality error of the driving shaft on the operation of the device is reduced by eliminating the principle error of the coaxiality of the driving shaft and enhancing the adaptability of the operation of the device to the coaxiality error.
Description
Technical Field
The invention belongs to the field of machinery, relates to an improved fine powder catalyst metering and distributing device, is mainly applied to gas olefin polymerization reaction with accurate catalyst metering and supply, also relates to a catalyst metering and distributing device with a bottom flange of a key part convenient to manufacture, and further relates to a catalyst metering and distributing device with good adaptability to coaxiality errors of a driving shaft.
Background
In the petrochemical industry, which involves the polymerization of large quantities of olefins, the possibility of stably dosing the catalyst over a long period of time directly determines the quality and the continuous productivity of the product. The domestic catalyst distribution device for continuous polymerization reaction basically realizes the metering supply of the catalyst, but the key parts of the device have high processing difficulty and the poor continuity of the metering supply of the catalyst still have two technical problems.
200610064918.8, discloses a catalyst dispensing device that is compact, easy to assemble and disassemble, and allows for precise adjustment of the catalyst. But the requirement of high processing precision of the bottom flange 3 of the key part of the device becomes a great obstacle to the popularization and the use of the device. The structure is shown in fig. 1.
The patent 200780045808.X discloses an imported catalyst distribution device widely used in China, which realizes the metering supply of catalyst by driving a metering disc 205 to rotate through a rotating spiral stirrer 203, and the spiral stirrer 203 transmits torque through a driving shaft 217 matched with the spiral stirrer 203. However, the drive method of both the helical agitator 203 and the metering disc 205 has a disadvantage. The structure is shown in fig. 2.
(1) The agitator 203 transmits both torque and tangential force to the metering disc 205, and the additional tangential force results in an increasing misalignment of the coaxiality of the drive shaft 217.
(2) As the metering disc wears away from the low friction material layer of the non-rotating assembly contact surface 215 and contact surface 503, the torque transmitted by the agitator 203 increases; because the axial seal 227 is an elastic element, the angular inclination of the drive shaft 217 caused by the misalignment of the coaxiality subjects the shear pin on which the drive shaft 217 is fitted to excessive shear forces; the ever-increasing transmission torque and the excessive shearing force can cause the safety pin to be excessively and excessively sheared, so that the safety protection of the solid supply device is lost in advance.
The increased concentricity error causes wear of the packing 227 of the elastic element and premature shearing of the shear pin, which directly reduces the long-term operational reliability of the device.
Therefore, the two major development trends of the current solid catalyst feeding device are to reduce the processing difficulty of key parts of the catalyst metering and distributing device and improve the long-term operation reliability of the device. In order to reduce the processing difficulty of a bottom flange of a key part of the device and improve the continuous metering and distributing capacity of the catalyst, the invention provides an improved fine powdery catalyst metering and distributing device which is more suitable for domestic popularization.
Disclosure of Invention
Aiming at the problems in the prior art. The invention provides an improved catalyst metering and distributing device, which reduces the processing difficulty of a bottom flange of a key part, improves the adaptability of the device operation to the coaxiality error of a driving shaft by improving the driving structure of a spiral stirrer and a metering disc and improving the support of a transmission shaft, and thereby enhances the continuous metering and distributing capacity of the catalyst.
In order to achieve the purpose, the invention adopts the technical scheme that:
an improved metering and distributing device for fine powdery catalyst comprises a middle flange 1, a bottom flange 2, a filtering device 3, a spiral stirrer 5, a metering assembly 6, a blanking assembly 9, a driving shaft 12, a shaft support assembly and a driving device.
The middle flange 1 is arranged on the upper part of the bottom flange 2 and is a middle transition container of the catalyst.
The bottom flange 2 is of a split structure and is formed by assembling a lifting lug 201, a flange body 202, a bearing fixing plate 203, a fine adjustment screw 204, a stud 205 and a lower support plate 206. The concrete structure is as follows: the lifting lug 201 is symmetrically welded on the circumferential surface of the flange body 202; the flange body 202 is provided with two discharging holes; the bearing fixing plate 203 is arranged in the middle of the bottom flange 2, and the bearing fixing plate 203 is matched with the stud 205 in a hole-shaft manner; all the parts are welded into a whole except that the bearing fixing plate 203 is kept at a proper axial position through a fine adjustment screw 204.
The filtering device 3 is arranged at the upper part of the middle flange 1.
The spiral stirrer 5 is supported and driven by a driving shaft 12 to rotate, and a proper gap is reserved between the bottom plane of the spiral stirrer and the wear-resistant disc 604; the spiral stirrer 5 is internally provided with a central hole, the upper part of the inner hole is directly matched with the driving shaft 12, and the lower part of the inner hole is a section of conical hole. The lower part of the drive pin is provided with 2 pin holes for storing the drive pin 7 in the circumferential direction. Correspondingly, the metering disc 603, which engages the lower portion of the helical agitator 5, has 2 recesses 6031 in its upper portion to receive the drive pins 7.
The metering assembly 6 comprises a floating cover plate 601, a floating disc 602, a metering disc 603 and a wear-resistant disc 604. And are arranged in sequence from top to bottom, and the rest components except the metering disc 603 are non-rotating components. The concrete structure is as follows: the floating cover plate 601 is fixed with the flange body 202; the lower surface of the floating disc 602 is coated with a non-metallic wear-resistant material; a spring automatic compensation device is arranged between the floating cover plate 601 and the floating disc 602, so that the floating disc 602 is tightly attached to the metering disc 603 in the operation process; the metering disc 603 is driven to rotate by a spiral stirrer 5 through a driving pin 7; the wear-resistant disc 604 is arranged at the bottom of the flange body 202, and the upper surface of the wear-resistant disc is coated with a non-metallic wear-resistant material.
The blanking assembly 9 is supported by the flange body 202 and is arranged at the blanking hole of the flange body 202.
The driving shaft 12 is two sections of stepped shafts, and the shaft shoulder is positioned in the middle of the driving shaft and used for determining the axial position of the conical guide sleeve 8. The driving shaft 12 sequentially penetrates through an inner hole of the spiral stirrer 5, a central hole of the flange body 202 and an inner hole of the bearing 13, the tail end of the driving shaft is connected with an output shaft of the speed reducer 15 through a coupler 14, and a through pin hole for storing the safety pin 4 is formed in the tail end of the driving shaft 12.
The shaft support assembly comprises a copper lantern ring 10, a packing 11, a bearing 13 and a coupling 14. Wherein: the copper lantern ring 10 and the packing 11 are arranged in a central hole of the flange body 202 and form interference fit with the driving shaft 12; the bearing 13 is placed on the bearing fixing plate 203, and the upper half part of the coupler is provided with a U-shaped groove 141 for storing the safety pin 4.
The driving device comprises a safety pin 4, a driving pin 7, a speed reducer 15 and a motor 16. The safety pin 4 is assembled in a through pin hole at the tail end of the driving shaft 12, and can play a role in overload protection; the driving pin 7 is matched with a pin hole of a cylinder at the lower part of the spiral stirrer 5; the reducer 15 and the drive shaft 12 realize torque transmission through the coupling 14 and the shear pin 4. The motor 16 is connected with the speed reducer 15.
Further, in order to reduce the processing difficulty of the bottom flange 2 while the catalyst metering and distribution are accurate, the flange body 202 of each component of the bottom flange 2 is guaranteed by a high-precision machine tool to ensure the processing precision, the parallelism of the upper surface and the lower surface of the flange body and the local roughness of the contact part of the lower surface and the blanking assembly 9, and other assemblies are processed according to economic precision. All parts are simply assembled before the device is tested, and all parts of the bottom flange 2 are adjusted to be assembled according to operation requirements during test run. Two threaded holes are drilled in each side face of the bearing fixing plate 203, and the threaded holes are arranged close to the vertical edges; the fine adjustment screw 204 is matched with a threaded hole in the side wall of the bearing fixing plate 203; the stud 205 and the bearing fixing plate 203 are in clearance fit; by adjusting the fine adjustment screw 204, the bearing 13 can be prevented from being locked, and the rotation precision of the driving shaft 12 can be ensured. After the proper position of the component is determined by adjusting the fine adjustment screw 204, the component is accurately fixed and welded into a whole.
Further, in order to prevent the safety pin 4 from being broken prematurely due to the excessive shearing force applied thereto in the prior art, the protrusion of the safety pin 4 from the through pin hole is formed in the middle of the U-shaped groove 141.
Further, to eliminate the principle error of the coaxiality of the drive shaft 12 relative to the central hole of the bottom flange 2 in the prior art. The pin holes of the circumference body at the lower part of the spiral stirrer 5 are symmetrical pin holes, correspondingly, the groove 6031 at the upper part of the measuring disc 603 matched with the lower part of the spiral stirrer 5 is symmetrical. In addition, the conical hole in the spiral stirrer 5 and the conical guide sleeve 8 form conical surface fit with high coaxiality precision.
Further, the adaptability of the device operation to the coaxiality error is enhanced. The bearing 13 is a self-aligning bearing and can compensate the coaxiality error of the driving shaft 12; the coupling 14 is a quincunx elastic coupling and can compensate the relative offset of the driving shaft 12 and the output shaft of the speed reducer 15.
Compared with the prior art, the invention has the beneficial effects that: the catalyst metering and distributing device is compact in structure, and reduces the processing difficulty of a flange at the bottom of a key part while realizing accurate metering of the fine powder catalyst. In addition, the influence of the coaxiality error of the driving shaft on the operation of the device is greatly reduced by eliminating the principle error of the coaxiality of the driving shaft and enhancing the adaptability of the operation of the device to the coaxiality error.
Drawings
FIG. 1 is a schematic partial cross-sectional view of a prior art catalyst metering device reproduced from the' 200610064918.8 patent;
figure 2 is a cross-sectional view of a prior art catalyst dosing apparatus reproduced from the 200780045808.X patent;
FIG. 3 is a schematic view, partially in cross-section, of the present invention in general;
FIG. 4 is an enlarged cross-sectional view of the metering portion;
FIG. 5 is a schematic structural view of a split bottom flange;
FIG. 6 is a cross-sectional view of a bearing retainer plate;
FIG. 7 is a schematic view of the shear pin engaging the U-shaped groove;
FIG. 8(a) is a front view of the metering disc;
FIG. 8(b) is a top view of the metering disc;
in the figure: 1, a middle flange; 2, a bottom flange, a 201 lifting lug, a 202 flange body, a 203 bearing fixing plate, a 204 fine adjustment screw, a 205 stud and a 206 lower support plate; 3, a filtering device; 4, a safety pin; 5, a spiral stirrer; 6 metering assembly, 601 floating cover plate, 602 floating disc, 603 metering disc, 6031 recess, 604 wear disc; 7 driving the pin; 8, a conical guide sleeve; 9, a blanking component; 10 a copper collar; 11 packing; 12 driving a shaft; 13 bearing; 14 coupler, 141U-shaped groove; 15, a speed reducer; 16 motor.
Detailed Description
In order to further explain the technical scheme of the invention, the invention is explained in detail in the following with reference to the attached drawings.
As shown in figure 1, an improved fine powdery catalyst metering and distributing device mainly comprises a middle flange 1, a bottom flange 2, a filtering device 3, a spiral stirrer 5, a metering assembly 6, a blanking assembly 9, a driving shaft 12, a shaft support assembly and a driving device.
The middle flange 1 is a middle transition container of the catalyst and is arranged at the upper part of the bottom flange 2.
The bottom flange 2 is of a split structure and is formed by assembling a lifting lug 201, a flange body 202, a bearing fixing plate 203, a fine adjustment screw 204, a stud 205 and a lower support plate 206. The concrete structure is as follows: the lifting lug 201 is symmetrically welded on the circumferential surface of the flange body 202; the flange body 202 is provided with two feeding holes, and when the metering holes on the metering disc 601 are opposite to the feeding holes, the catalyst falls into the feeding assembly 9 from the metering holes under the action of gravity. In order to ensure accurate catalyst metering, the flange body 202 ensures the processing precision by a high-precision machine tool, so that the parallelism of the upper surface and the lower surface of the flange body and the local roughness of the contact part of the lower surface and the blanking assembly are ensured, and the rest assemblies are processed according to economic precision; the bearing fixing plate 203 is arranged in the middle of the bottom flange 2, threaded holes are drilled in the side walls of the bearing fixing plate (8 threaded holes are drilled in 4 side walls in total), and the threaded holes are arranged close to the vertical edges; the fine adjustment screw 204 is matched with a threaded hole in the side wall of the bearing fixing plate 203; the stud 205 and the bearing fixing plate 203 are in clearance fit, so that the fine adjustment screw 204 can be adjusted; except that the bearing fixing plate 203 is kept at a proper axial position through the fine adjustment screw 204, the rest parts are welded into a whole, and the welding seam position is shown in figure 5.
The filtering device 3 is arranged on the upper part of the middle flange 1, so that large-particle catalysts can be prevented from blocking the metering assembly.
Specifically, the filtration capacity is greater than the catalyst feed rate.
The spiral stirrer 5 is supported by the driving shaft 12 and driven to rotate, and mainly plays a role in loosening the catalyst. A proper gap is left between the bottom plane of the wear-resistant disc and the wear-resistant disc 604; the upper part of the inner hole is directly matched with the driving shaft 12; the lower part of the inner center hole is a section of conical hole which forms conical surface fit with the conical guide sleeve 8, and the coaxiality error of the driving shaft 12 in the operation process can be reduced by utilizing the characteristic of high coaxiality precision of conical surface fit; the lower part of the driving pin is provided with 2 symmetrical pin holes for storing the driving pin 7 in the circumferential direction. The symmetrical arrangement of the drive pins 7 eliminates the principle error of the coaxiality of the drive shaft 12 with respect to the central hole of the bottom flange 2 during operation of the device.
The metering assembly 6 comprises a floating cover plate 601, a floating disc 602, a metering disc 603 and a wear-resistant disc 604. And are arranged in sequence from top to bottom, and the rest components except the metering disc 603 are non-rotating components. Wherein: the floating cover plate 601 is fixed with the flange body 202 into a whole; the lower surface of the floating disc 602 is coated with an abrasion resistant material; a spring automatic compensation device is arranged between the floating cover plate 601 and the floating disc 602, so that the floating disc 602 is tightly attached to the metering disc 603 in the operation process, and the phenomenon of forced catalyst feeding is avoided; the metering disc 603 is driven by the spiral stirrer 5 to rotate, and 2 grooves 6031 for accommodating the driving pins 7 are symmetrically formed in the upper part of the metering disc; the wear-resistant disc 604 is fixed at the bottom of the flange body 202, and the contact surface of the wear-resistant disc 604 and the lower surface of the metering disc 603 is coated with non-metallic wear-resistant materials.
The blanking assembly 9 is supported by the flange body 202 and is arranged at the blanking hole of the flange body 202. Can drive the catalyst to continuously enter the reaction vessel.
The driving shaft 12 is two sections of stepped shafts, and the shaft shoulder is positioned in the middle of the driving shaft, so that the axial position of the conical guide sleeve 8 can be determined. The upper part of the driving shaft 12 is supported with a spiral stirrer and sequentially passes through an inner hole of the spiral stirrer 5 and a central hole of the flange body 202, the middle part is supported by a bearing 13, the tail end is connected with an output shaft of a speed reducer 15 through a coupler 14, and the tail end of the driving shaft 12 is provided with a through pin hole for storing a safety pin 4.
The shaft support assembly comprises a copper lantern ring 10, a packing 11, a bearing 13 and a coupling 14. Wherein: the copper lantern ring 10 and the packing 11 are arranged in the central hole of the flange body 202 and form interference fit with the driving shaft 12; the bearing 13 is a self-aligning bearing and is arranged on the bearing fixing plate 203, and the self-aligning performance of the bearing can compensate the coaxiality error of the driving shaft 12; the coupling 14 is formed in its upper part with a U-shaped groove 141 for storing the safety pin 4.
The driving device comprises a safety pin 4, a driving pin 7, a speed reducer 15 and a motor 16. The safety pin 4 assembled in the through pin hole at the tail end of the driving shaft 12 plays a role of overload protection, and the extending part of the safety pin 4 is positioned in the middle of the U-shaped groove 141 so as to ensure that the safety pin 4 only bears pure torque and avoid bearing redundant shearing force; the driving pin 7 is matched with a pin hole of a cylinder at the lower part of the spiral stirrer 5; the reducer 15 and the drive shaft 12 realize torque transmission through the coupling 14 and the shear pin 4.
Specifically, by adjusting the fine adjustment screw 204, the bearing 13 can be prevented from being locked, and the rotation precision of the driving shaft 12 can be ensured. The inner ring, the ball and the retainer of the self-aligning bearing 13 can rotate at a certain angle relative to the outer ring, and the self-aligning bearing has self-aligning capability, and the self-aligning capability can compensate for coaxiality errors. Referring to fig. 5, the hole-shaft fit achieved by the bearing fixing plate 203 and the stud 205 is clearance fit, referring to fig. 6, so that the relative inclination degree of the inner ring and the outer ring of the self-aligning bearing 13 can be adjusted by adjusting 8 fine adjustment screws 204 on the side wall of the bearing fixing plate 203, the relative inclination degree of the inner ring and the outer ring is within an allowable range, the bearing is prevented from being locked, the automatic aligning function of the self-aligning bearing 13 is achieved, and finally the rotation precision of the driving shaft 12 is guaranteed.
Preferably, the coupling 14 is a quincunx elastic coupling, power is transmitted through extrusion between the convex claws and the elastic elements, and the elastic deformation generated by the elastic elements can compensate relative offset of the two shafts to realize vibration damping and buffering. Therefore, the coupling can reduce the influence of the relative offset of the output shaft of the speed reducer 15 and the driving shaft 12 on the coaxiality error of the driving shaft 12.
It can be seen that the present invention has the capability of precise metering of finely divided catalyst. When the device operates, the catalyst enters the middle flange 1 through the filtering device 3 under the action of gravity, the driving device drives the spiral stirrer 5 to rotate, so that the catalyst falls on the metering disc 603, each metering hole of the metering disc 603 is filled with the catalyst under the action of the floating cover plate 601 and the floating disc 602, the metering disc 603 is driven to rotate continuously along with the spiral stirrer 5, and the catalyst in the metering holes enters the blanking assembly 9 through the blanking holes in the bottom flange 2 and is finally supplied to the reaction container.
As well known, the bottom flange 2 adopts a split structure, the processing difficulty of the bottom flange 2 is reduced by using lower part precision and less assembly labor amount, and the assembly precision required by the normal operation of the distribution device is achieved. And the fine adjustment screw 204 can be adjusted to avoid the bearing 13 from being blocked, and the rotation precision of the driving shaft 12 is ensured.
It is known that, since the U-shaped groove 141 is formed on the upper half portion of the quincunx elastic coupling 14, and the safety pin 4 is disposed in the middle of the U-shaped groove 141 and directly contacts with the side wall of the U-shaped groove 141, the safety pin 4 does not bear excessive axial force due to the coaxiality error of the driving shaft 12 in the process of transmitting torque, and the overload fracture phenomenon of the safety pin 4 in the prior art is avoided. By improving the driving structure between the spiral stirrer 5 and the metering disc 603 and the conical surface formed by the conical guide sleeve 8 and the conical hole of the spiral stirrer 5, the principle error of the coaxiality of the driving shaft 12 relative to the central hole of the bottom flange 2 in the prior art is eliminated; by adopting the self-aligning bearing 13 and the quincunx elastic coupling 14, the support of the driving shaft 12 is improved, and the adaptability of the catalyst distribution device to the coaxiality error of the driving shaft 12 is improved. Therefore, the influence of the coaxiality error of the driving shaft on the operation of the device is greatly weakened.
The invention reduces the processing difficulty of the bottom flange of the key part through split type processing under the condition of meeting the operation requirement of the device; by improving the driving structures of the spiral stirrer and the metering disc, the principle error of the driving shaft relative to the central hole of the bottom flange is eliminated; the premature shearing of the safety pin is avoided by changing the placing mode of the safety pin; the shaft support assembly improves the support of the driving shaft and improves the adaptability of the device to the coaxiality error of the driving shaft. In summary, the invention is advantageous for enhancing the continuity of the dosing of the catalyst.
The above-mentioned embodiments only express the embodiments of the present invention, but not should be understood as the limitation of the scope of the invention patent, it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the concept of the present invention, and these all fall into the protection scope of the present invention.
Claims (5)
1. An improved metering and distributing device for fine powdery catalyst, wherein a middle flange (1) is arranged at the upper part of a bottom flange (2) and is a middle transition container for the catalyst, a filtering device (3) is arranged at the upper part of the middle flange (1), and a blanking assembly (9) is supported by the bottom flange (2); the device is characterized by also comprising a bottom flange (2), a spiral stirrer (5), a metering assembly (6), a driving shaft (12), a shaft support assembly and a driving device;
the middle flange (1) is arranged at the upper part of the bottom flange (2) and is a middle transition container of the catalyst;
the bottom flange (2) is of a split structure and is formed by assembling lifting lugs (201), a flange body (202), a bearing fixing plate (203), fine adjustment screws (204) and studs (205); the lifting lugs (201) are symmetrically arranged on the circumferential surface of the flange body (202); the flange body (202) is provided with two discharging holes; the bearing fixing plate (203) is arranged in the middle of the bottom flange (2), and the bearing fixing plate (203) is matched with the stud (205) in a hole-shaft mode; all the parts except the bearing fixing plate (203) are welded into a whole except that the proper axial position is kept by the fine adjustment screw (204); the blanking assembly (9) is supported by the flange body (202) and is arranged at a blanking hole of the flange body (202);
the filtering device (3) is arranged at the upper part of the middle flange (1);
the spiral stirrer (5) is supported by a driving shaft (12) and is driven to rotate, and a proper gap is reserved between the bottom plane of the spiral stirrer and the wear-resistant disc (604); a central hole is arranged in the spiral stirrer (5), the upper part of the central hole is directly matched with the driving shaft (12), the lower part of the central hole is a section of conical hole, and the conical hole and the conical guide sleeve (8) form conical surface matching with high coaxiality and precision; 2 pin holes for storing the driving pin (7) are symmetrically formed in the circumferential direction of the lower part of the spiral stirrer (5); correspondingly, a measuring disc (603) matched with the lower part of the spiral stirrer (5) is provided with 2 symmetrical grooves (6031) for accommodating the driving pins (7) at the upper part;
the metering assembly (6) comprises a floating cover plate (601), a floating disc (602), a metering disc (603) and a wear-resisting disc (604); the components are arranged from top to bottom in sequence, and except the metering disc (603), the other components are non-rotating components; the floating cover plate (601) is fixed with the flange body (202); the lower surface of the floating disc (602) is coated with non-metallic wear-resistant material; a spring automatic compensation device is arranged between the floating cover plate (601) and the floating disc (602) and is used for ensuring that the floating disc (602) is tightly attached to the metering disc (603) in the operation process; the metering disc (603) is driven to rotate by a spiral stirrer (5) through a driving pin (7); the wear-resistant disc (604) is arranged at the bottom of the flange body (202), and the upper surface of the wear-resistant disc is coated with a non-metallic wear-resistant material;
the driving shaft (12) is provided with two sections of stepped shafts, and a shaft shoulder is positioned in the middle of the driving shaft and used for determining the axial position of the conical guide sleeve (8); a driving shaft (12) sequentially penetrates through an inner hole of the spiral stirrer (5), a central hole of the flange body (202) and an inner hole of the bearing (13), the tail end of the driving shaft is connected with an output shaft of the speed reducer (15) through a coupler (14), and a through pin hole for storing a safety pin (4) is formed in the tail end of the driving shaft (12);
the shaft support assembly comprises a copper lantern ring (10), a packing (11), a bearing (13) and a coupling (14); the copper lantern ring (10) and the packing (11) are arranged in a center hole of the flange body (202) and form interference fit with the driving shaft (12); the bearing (13) is placed on the bearing fixing plate (203), and a U-shaped groove (141) for storing the safety pin (4) is processed at the upper half part of the coupler;
the driving device comprises a safety pin (4), a driving pin (7), a speed reducer (15) and a motor (16); the safety pin (4) is assembled in a through pin hole at the tail end of the driving shaft (12) to play a role in overload protection; the speed reducer (15) and the driving shaft (12) realize torque transmission through the coupling (14) and the safety pin (4).
2. An improved metering and dispensing device for fine powdery catalyst according to claim 1, characterized in that, in order to reduce the difficulty of machining the bottom flange (2) while the catalyst metering and dispensing is accurate, the bottom flange (2) is composed of parts, the flange body (202) is machined by a high-precision machine tool with the machining precision, and the rest of the components are machined with economic precision; the device is simple in assembly of all parts before test run, and the assembly of all parts of the bottom flange is adjusted according to operation requirements during test run; two threaded holes are drilled in each side face of the bearing fixing plate (203); the fine adjustment screw (204) is matched with a threaded hole in the side wall of the bearing fixing plate (203); the stud (205) and the bearing fixing plate (203) are in clearance fit; by adjusting the fine adjustment screw (204), the bearing (13) can be prevented from being clamped, and the rotation precision of the driving shaft (12) is ensured; after the proper position of the component is determined by adjusting the fine adjustment screw (204), the component is accurately fixed and welded into a whole.
3. An improved fine powder catalyst metering device as claimed in claim 1, characterized in that the projection of the safety pin (4) from the through-pin hole is in the middle of the U-shaped groove (141).
4. An improved fine-powder catalyst metering device according to claim 1, characterized in that the bearing (13) is a self-aligning bearing for compensating for a misalignment of the drive shaft (12) in the direction of its axis.
5. An improved dosing device for catalyst in the form of fine powder according to claim 1, characterised in that said coupling (14) is a quincunx elastic coupling for compensating the relative offset of the drive shaft (12) and the output shaft of the reducer (15).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010112334.3A CN111229132B (en) | 2020-02-24 | 2020-02-24 | Improved metering and distributing device for fine powder catalyst |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010112334.3A CN111229132B (en) | 2020-02-24 | 2020-02-24 | Improved metering and distributing device for fine powder catalyst |
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| CN111229132A true CN111229132A (en) | 2020-06-05 |
| CN111229132B CN111229132B (en) | 2021-05-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112316855A (en) * | 2020-10-06 | 2021-02-05 | 大连理工大学 | Improved micro powder metering device with adjustable sealing force on metering disc and corresponding adjusting method |
Citations (6)
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| CN111229132B (en) | 2021-05-11 |
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