CN111229132A - An Improved Fine Powder Catalyst Metering and Dispensing Device - Google Patents

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

An Improved Fine Powder Catalyst Metering and Dispensing Device

technical field

The invention belongs to the field of machinery, and relates to an improved fine powder catalyst metering and distributing device, which is mainly used in the gas olefin polymerization reaction in which the catalyst is accurately metered and supplied, and also relates to a catalyst metering and distributing device whose bottom flange of a key part is easy to manufacture, It also relates to a catalyst metering and distributing device with good adaptability to the coaxiality error of the drive shaft.

Background technique

In the petrochemical industry involving a large number of olefin polymerization reactions, the long-term stable metering of catalysts directly determines product quality and sustained productivity. The domestic catalyst distribution device for continuous polymerization has basically realized the metered supply of catalyst, but the high processing difficulty of key parts of the device and the poor continuity of catalyst metered supply are still two major technical problems.

The 200610064918.8 patent discloses a catalyst dispensing device, which has a compact structure, is easy to assemble and disassemble, and can realize precise adjustment of the catalyst. However, the high machining accuracy required for the bottom flange 3 of the key part of the device has become a major obstacle to its popularization and use. Its structure is shown in Figure 1.

The 200780045808.X patent discloses an imported catalyst distribution device widely used in China, which drives the metering disc 205 to rotate through the rotating screw agitator 203 to realize the metering supply of the catalyst, and the screw agitator 203 is transmitted by the drive shaft 217 matched with it. torque. However, there are defects in the driving methods of the screw agitator 203 and the metering disc 205 . Its structure is shown in Figure 2.

(1) The agitator 203 transmits torque and tangential force to the metering disc 205 at the same time, and the additional tangential force will cause the coaxiality error of the drive shaft 217 to increase continuously.

(2) With the wear of the low-friction material layer of the contact surface 215 and the contact surface 503 of the metering disc and the non-rotating component, the torque transmitted by the agitator 203 increases; because the axial seal 227 is an elastic element, the concentricity error is caused by The inclined angle of the drive shaft 217 will cause the safety pin assembled with the drive shaft 217 to bear excess shearing force; the increasing transmission torque and excess shearing force will cause the safety pin to be prematurely overloaded and cut off, causing the solid supply device to lose its safety in advance. Protect.

The wear of the elastic element packing 227 and the premature shearing of the safety pin caused by the ever-increasing coaxiality error will directly reduce the long-term operation reliability of the device.

It can be seen that reducing the processing difficulty of the key parts of the catalyst metering and dispensing device and improving the long-term operation reliability of the device are the two major development trends of the current solid catalyst feeding device. In order to reduce the processing difficulty of the bottom flange of the key parts of the device and at the same time improve the ability of continuous metering and distribution of the catalyst, the present invention proposes an improved metering and distribution device for fine powder catalyst which is more suitable for localization and promotion.

SUMMARY OF THE INVENTION

For the problems existing in the prior art. The invention provides an improved catalyst metering and distributing device, which reduces the processing difficulty of the bottom flange of key parts, improves the drive structure of the screw agitator, the metering disc and improves the support of the drive shaft, and improves the coaxiality of the device operation to the drive shaft. This improves the ability of the catalyst to continue metering.

In order to achieve the above object, the technical scheme adopted in the present invention is:

An improved fine powder catalyst metering and distributing device, comprising a middle flange 1, a bottom flange 2, a filter device 3, a screw agitator 5, a metering component 6, a blanking component 9, a drive shaft 12, a shaft support component, a drive device.

The middle flange 1 is installed on the upper part of the bottom flange 2 and is an intermediate transition container for the catalyst.

The bottom flange 2 is a split structure, which is assembled and assembled by 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 specific structure is as follows: the lifting lugs 201 are symmetrically welded to the circumferential surface of the flange body 202; the flange body 202 is provided with two blanking holes; the bearing fixing plate 203 is arranged in the middle of the bottom flange 2, and the bearing fixing plate 203 and the stud 205 realize hole-shaft fit; except that the bearing fixing plate 203 maintains a proper axial position through the fine-tuning screw 204, the rest of the parts are welded into one.

The filter device 3 is arranged on the upper part of the middle flange 1 .

The screw agitator 5 is supported and driven to rotate by the drive shaft 12, and there is an appropriate gap between the bottom plane and the wear-resistant disc 604; the screw agitator 5 is provided with a central hole inside, and the upper part of the inner hole is directly matched with the drive shaft 12, The lower part of the inner hole is a section of conical hole. There are two pin holes for storing the drive pins 7 in the circumferential direction of the lower part. Correspondingly, two grooves 6031 for accommodating the driving pins 7 are formed in the upper part of the metering plate 603 matched with the lower part of the screw agitator 5 .

The metering assembly 6 includes a floating cover plate 601 , a floating disk 602 , a metering disk 603 , and a wear-resistant disk 604 . They are arranged in sequence from top to bottom. Except for the metering disc 603, the other components are non-rotating components. The specific structure is as follows: the floating cover plate 601 is fixed with the flange body 202; the lower surface of the floating plate 602 is covered with non-metallic wear-resistant materials; a spring automatic compensation device is arranged between the floating cover plate 601 and the floating plate 602, which can ensure the operation During the process, the floating disk 602 is closely attached to the metering disk 603; the metering disk 603 is driven to rotate by the screw agitator 5 through the driving pin 7; the wear-resistant disk 604 is installed at the bottom of the flange body 202, and its upper surface is covered with Metal wear-resistant material.

The blanking assembly 9 is supported by the flange body 202 and installed at the blanking hole of the flange body 202 .

The drive shaft 12 is a two-stage stepped shaft, and the shaft shoulder is located in the middle of the drive shaft to determine the axial position of the tapered guide sleeve 8 . The drive shaft 12 passes through the inner hole of the screw agitator 5, the central hole of the flange body 202, and the inner hole of the bearing 13 in sequence, and is connected to the output shaft of the reducer 15 through the coupling 14 at the end. The end of the drive shaft 12 is provided with a storage safety pin 4 through pin holes.

The shaft support assembly includes a copper collar 10 , a packing 11 , a bearing 13 , and a coupling 14 . Wherein: the copper collar 10 and the packing 11 are installed in the center hole of the flange body 202, and form an interference fit with the drive shaft 12; the bearing 13 is placed on the bearing fixing plate 203, and the coupling The half is machined with a U-shaped groove 141 for storing the safety pin 4 .

The driving device includes a safety pin 4 , a driving pin 7 , a reducer 15 , and a motor 16 . The safety pin 4 is assembled in the through pin hole at the end of the drive shaft 12, which can play an overload protection function; the drive pin 7 is matched with the pin hole of the lower cylinder of the screw agitator 5; the reducer 15 and the drive shaft 12 pass through the coupling shaft The actuator 14 and the safety pin 4 realize torque transmission. The motor 16 is connected to the reducer 15 .

Further, in order to reduce the processing difficulty of the bottom flange 2 while the catalyst metering is accurate, each component of the bottom flange 2 and the flange body 202 are processed by a high-precision machine tool to ensure the processing accuracy, which can ensure the parallelism of its upper and lower surfaces. , and the local roughness of the lower surface in contact with the blanking component 9, and the remaining components are processed with economical precision. Each part of the device is simply assembled before the test run, and the assembly of each part of the bottom flange 2 is adjusted according to the operation needs during the test run. Two threaded holes are drilled on each side of the bearing fixing plate 203, and the threaded holes are arranged adjacent to the vertical edges; the fine adjustment screw 204 is matched with the threaded hole on the side wall of the bearing fixing plate 203; the stud 205 is connected to the bearing The fitting property of the fixing plate 203 is clearance fit; by adjusting the fine adjustment screw 204 , the bearing 13 can be prevented from being stuck and the rotation accuracy of the drive shaft 12 can be ensured. After the proper position of the assembly is determined by adjusting the fine adjustment screw 204, it is then precisely fixed and welded into one.

Further, in order to prevent the safety pin 4 from being prematurely broken due to excessive shearing force in the prior art, the protruding part of the safety pin 4 from the through pin hole is in the middle of the U-shaped groove 141 .

Further, in order 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 lower circumferential body of the spiral agitator 5 are symmetrical pin holes, and correspondingly, the upper groove 6031 of the metering plate 603 matched with the lower part of the spiral agitator 5 is symmetrical. In addition, the inner conical hole of the spiral stirrer 5 and the conical guide sleeve 8 form a conical surface with high coaxiality precision.

Further, in order to enhance the adaptability of the device operation to the coaxiality error. The bearing 13 is a self-aligning bearing, which can compensate the coaxiality error of the drive shaft 12; the coupling 14 is a plum-shaped elastic coupling, which can compensate the relative deviation of the drive shaft 12 and the output shaft of the reducer 15. shift.

Compared with the prior art, the present invention has the beneficial effects that the catalyst metering and distributing device has a compact structure, which reduces the processing difficulty of the bottom flange of the key part while realizing the precise metering of the fine powder catalyst. In addition, by eliminating the principle error of the coaxiality of the drive shaft and enhancing the adaptability of the operation of the device to the coaxiality error, the influence of the coaxiality error of the drive shaft on the operation of the device is greatly reduced.

Description of drawings

Fig. 1 is the partial cross-sectional schematic diagram of the catalyst metering and dispensing device of the prior art copied from the 200610064918.8 patent;

Figure 2 is a cross-sectional view of a prior art catalyst metering and dispensing device copied from the 200780045808.X patent;

FIG. 3 is a schematic partial cross-sectional view of the overall structure of the present invention;

Figure 4 is an enlarged cross-sectional view of the metering part;

Figure 5 is a schematic diagram of the split bottom flange structure;

Figure 6 is a sectional view of the bearing fixing plate;

Figure 7 is a schematic diagram of the cooperation between the shear pin and the U-shaped groove;

Figure 8(a) is a front view of the metering disc;

Figure 8(b) is a top view of the metering plate;

In the picture: 1 middle flange; 2 bottom flange, 201 lifting lugs, 202 flange body, 203 bearing fixing plate, 204 fine adjustment screw, 205 stud, 206 lower support plate; 3 filter device; 4 safety pin; 5 screw Agitator; 6 metering components, 601 floating cover plate, 602 floating disc, 603 metering disc, 6031 groove, 604 wear-resistant disc; 7 drive pins; 8 conical guide bushes; 9 blanking components; 10 copper collars; 11 Packing; 12 drive shafts; 13 bearings; 14 couplings, 141 U-slots; 15 reducers; 16 motors.

Detailed ways

In order to further explain the technical solutions of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

As shown in Figure 1, an improved fine powder catalyst metering and distributing device is mainly composed of a middle flange 1, a bottom flange 2, a filter device 3, a screw agitator 5, a metering component 6, a blanking component 9, and a drive shaft 12. , shaft support components, drive components.

The middle flange 1 is an intermediate transition vessel for the catalyst, and is installed on the upper part of the bottom flange 2 .

The bottom flange 2 is a split structure, which is assembled and assembled by 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 specific structure is as follows: the lifting lugs 201 are symmetrically welded to the circumferential surface of the flange body 202; the flange body 202 is provided with two feeding holes. Under the action of gravity, it falls into the unloading assembly 9 from the metering hole. In order to ensure the accurate measurement of the catalyst, the flange body 202 is processed by a high-precision machine tool to ensure the processing accuracy, thereby ensuring the parallelism of its upper and lower surfaces, and the local roughness of the contact part between the lower surface and the blanking component, and the remaining components are processed with economic precision; The bearing fixing plate 203 is arranged in the middle of the bottom flange 2, and its side walls are drilled with threaded holes (4 side walls have 8 threaded holes in total), and the threaded holes are arranged adjacent to the vertical edges; The threaded holes on the side wall of the bearing fixing plate 203 are matched; the stud 205 and the bearing fixing plate 203 are matched in a clearance fit, so that the fine-tuning screw 204 can be adjusted; In addition, the rest of the parts are welded as a whole, and the position of the welding seam is shown in Figure 5.

The filtering device 3 is arranged on the upper part of the middle flange 1, which can prevent the large particle catalyst from clogging the metering component.

Specifically, the filtration capacity is greater than the catalyst feed rate.

The screw agitator 5 is supported by the drive shaft 12 and driven to rotate, and mainly plays the role of loosening the catalyst. There is a proper gap between the bottom plane and the wear-resistant disc 604; the upper part of the inner hole is directly matched with the drive shaft 12; the lower part of the inner center hole is a section of tapered hole, and the tapered hole and the tapered guide sleeve 8 form a tapered fit, The coaxiality error of the drive shaft 12 during operation can be reduced by utilizing the characteristics of the high precision of the conical surface matching the coaxiality; The symmetrical arrangement of the drive pins 7 can eliminate the principle error of the coaxiality of the drive shaft 12 relative to the central hole of the bottom flange 2 when the device is running.

The metering assembly 6 includes a floating cover plate 601 , a floating disk 602 , a metering disk 603 , and a wear-resistant disk 604 . They are arranged in sequence from top to bottom. Except for the metering disc 603, the other components are non-rotating components. Among them: the floating cover plate 601 and the flange body 202 are fixed as a whole; the lower surface of the floating plate 602 is covered with wear-resistant materials; a spring automatic compensation device is arranged between the floating cover plate 601 and the floating plate 602, which can make the floating plate 602 during operation. 602 is closely attached to the metering plate 603 to avoid the forced feeding of catalyst; the metering plate 603 is driven to rotate by the screw agitator 5, and the upper part of the metering plate 603 is symmetrically opened with two grooves 6031 for accommodating the driving pins 7; the wear-resistant plate 604 is fixed on the flange The bottom of the main body 202 is covered with a non-metal wear-resistant material on its contact surface with the lower surface of the metering disc 603 .

The blanking assembly 9 is supported by the flange body 202 and installed at the blanking hole of the flange body 202 . The catalyst can be driven into the reaction vessel continuously.

The drive shaft 12 is a two-stage stepped shaft, and the shaft shoulder is located in the middle of the drive shaft, which can determine the axial position of the tapered guide sleeve 8 . The upper part of the drive shaft 12 is supported with a helical agitator, and passes through the inner hole of the helical agitator 5 and the center hole of the flange body 202 in turn, is supported by the bearing 13 in the middle, and is connected to the output shaft of the reducer 15 through the coupling 14 at the end, The rear end of the drive shaft 12 is provided with a through pin hole for storing the safety pin 4 .

The shaft support assembly includes a copper collar 10 , a packing 11 , a bearing 13 , and a coupling 14 . Among them: the copper collar 10 and the packing 11 are installed in the center hole of the flange body 202, and form an interference fit with the drive shaft 12; the bearing 13 is a self-aligning bearing, which is placed on the bearing fixing plate 203, and its self-aligning performance can be improved Compensate for the coaxiality error of the drive shaft 12 ; the upper half of the coupling 14 is machined with a U-shaped groove 141 for storing the safety pin 4 .

The driving device includes a safety pin 4 , a driving pin 7 , a reducer 15 , and a motor 16 . The safety pin 4 assembled in the through pin hole at the end of the drive shaft 12 plays an overload protection role, and its protruding part is located in the middle of the U-shaped groove 141 to ensure that the safety pin 4 only receives pure torque and avoids excessive shear force; the drive pin 7 It is matched with the pin hole of the lower cylinder of the screw agitator 5; the reducer 15 and the drive shaft 12 realize torque transmission through the coupling 14 and the safety pin 4.

Specifically, by adjusting the fine adjustment screw 204, the bearing 13 can be prevented from being stuck, and the rotation accuracy of the drive shaft 12 can be ensured. The inner ring, the ball and the cage of the self-aligning bearing 13 can rotate at a certain angle relative to the outer ring, and have the ability of self-aligning, and the self-aligning ability can compensate the coaxiality error. Referring to FIG. 5 , because the hole-shaft fit achieved by the bearing fixing plate 203 and the stud 205 is a clearance fit, referring to FIG. 6 , the inner and outer parts of the self-aligning bearing 13 can be adjusted by adjusting the eight fine-tuning screws 204 on the side wall of the bearing fixing plate 203 The relative inclination of the rings keeps the relative inclination of the inner and outer rings within the allowable range to avoid the bearing from being stuck, so as to realize the self-aligning function of the self-aligning bearing 13 and finally ensure the rotation accuracy of the drive shaft 12 .

Preferably, the coupling 14 is a plum-shaped elastic coupling, which transmits power through the extrusion between the convex claw and the elastic element, and the elastic deformation generated by the elastic element can compensate for the relative offset of the two connecting shafts, so as to reduce vibration buffer. Therefore, this type of coupling can weaken the influence of the relative offset between the output shaft of the reducer 15 and the drive shaft 12 on the coaxiality error of the drive shaft 12 .

It can be seen that the present invention is fully capable of accurately metering and distributing the fine powder catalyst. When the device is running, the catalyst enters the middle flange 1 through the filter device 3 under the action of gravity, and the driving device drives the screw agitator 5 to rotate, so that the catalyst falls on the metering plate 603. Under the action of the floating cover plate 601 and the floating plate 602 , the catalyst fills each metering hole of the metering disc 603, and as the screw agitator 5 drives the metering disc 603 to rotate continuously, the catalyst in the metering hole enters the blanking component 9 through the blanking hole on the bottom flange 2, and finally supplies the reaction container.

It is also known that the bottom flange 2 adopts a split structure, which reduces the processing difficulty of the bottom flange 2 and achieves the assembly accuracy required for the normal operation of the dispensing device with lower part precision and less assembly labor. The fine adjustment screw 204 can be adjusted to prevent the bearing 13 from being stuck and ensure the rotation accuracy of the drive shaft 12 .

Furthermore, since the U-shaped groove 141 is processed in the upper half of the plum-shaped elastic coupling 14, the safety pin 4 is arranged in the middle of the U-shaped groove 141, and directly contacts the side wall of the U-shaped groove 141, so that the safety pin 4 In the process of torque transmission, excess axial force will not be borne due to the coaxiality error of the drive shaft 12, which avoids the overload breaking phenomenon of the safety pin 4 in the prior art. By improving the driving structure between the screw agitator 5 and the metering disc 603, and in addition, the conical surface of the conical guide sleeve 8 and the conical surface formed by the conical hole of the screw agitator 5 have the characteristics of high coaxiality accuracy, eliminating the prior art. The principle error of the coaxiality of the middle drive shaft 12 relative to the central hole of the bottom flange 2; by using the self-aligning bearing 13 and the plum-shaped elastic coupling 14, the support of the drive shaft 12 is improved, and the catalyst distribution device to the drive shaft is improved. 12 The adaptability of the coaxiality error. Therefore, the influence of the coaxiality error of the drive shaft on the operation of the device is greatly reduced.

The invention reduces the difficulty of processing the bottom flange of key parts through split processing under the condition of meeting the operation requirements of the device; and eliminates the principle error of the driving shaft relative to the center hole of the bottom flange by improving the driving structure of the screw agitator and the metering plate ; By changing the placement method of the safety pin, the premature shearing of the safety pin is avoided; the shaft support assembly improves the support of the drive shaft, and the adaptability of the lifting device to the coaxiality error of the drive shaft. Taken together, the present invention is beneficial for enhancing the sustainability of catalyst dosing.

The above-mentioned embodiments only represent the embodiments of the present invention, but should not be construed as a limitation on the scope of the present invention. It should be pointed out that for those skilled in the art, without departing from the concept of the present invention, Several modifications and improvements can also be made, which all belong to 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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