Flow equalizing device in negative pressure weighing chamber and use method

Abstract

The invention belongs to the technical field of flow equalizing devices, and particularly relates to a flow equalizing device in a negative pressure weighing chamber and a using method, the flow equalizing device comprises a first annular plate and a second annular plate, a flow equalizing plate is fixedly mounted at the bottom end of an inner cavity of the first annular plate, and a fixing plate is fixedly mounted at the top end of an inner cavity of the second annular plate; an air inlet pipe is fixedly installed on the fixing plate, a plurality of supporting rods are fixedly installed between the first annular plate and the second annular plate, and a filter screen is fixedly installed at the top end of an inner cavity of the first annular plate. According to the invention, by arranging the shunting assembly, air can be uniformly placed in the second annular plate, so that the air speed of each part of the working area can be consistent to a certain extent, the influence on the weighing result can be avoided, and the working efficiency can be improved. And the cleanliness and the negative pressure stability of a working area can be kept.

Description

Technical Field

[0001] The invention relates to the technical field of flow balancing devices, and in particular to a flow balancing device in a negative pressure weighing chamber and a use method thereof. Background Art

[0002] Negative pressure weighing room (negative pressure weighing table) is a local purification equipment specially used in places such as pharmaceutical manufacturing, microbiological research and scientific experiments. It provides a vertical unidirectional airflow. Part of the clean air circulates in the working area, and part is discharged to the nearby area, so that negative pressure is generated in the working area to prevent cross contamination and to ensure a high cleanliness environment in the working area.

[0003] At present, in the negative pressure weighing room, the air is delivered to the working area through the flow equalization device at the outlet of the air supply box, and then the air is processed by flow equalization. However, the existing flow equalization device has the following disadvantages when used:

[0004] 1. During long-term use, some impurities in the air will accumulate on the flow equalizer. When there are too many impurities, the flow equalizer will be blocked, which will affect the flow equalization effect.

[0005] 2. There are defects in the design. For example, there is no reasonable wind guide or diversion structure in the flow equalization device, which leads to different wind speeds in different parts of the working area. This will not only affect the weighing results, but also be detrimental to maintaining the cleanliness and negative pressure stability of the working area.

[0006] Therefore, a flow balancing device in a negative pressure weighing chamber and a method for using the same are disclosed. Summary of the invention

[0007] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0008] A flow equalizing device in a negative pressure weighing chamber, comprising a first annular plate and a second annular plate, wherein the flow equalizing plate is fixedly installed at the bottom end of the inner cavity of the first annular plate, and a fixing plate is fixedly installed at the top end of the inner cavity of the second annular plate, an air inlet pipe is fixedly installed on the fixing plate, a plurality of support rods are fixedly installed between the first annular plate and the second annular plate, a filter is fixedly installed at the top end of the inner cavity of the first annular plate, a diverter component for evenly placing air in the second annular plate is provided in the air inlet pipe, a cleaning component for cleaning impurities on the filter is provided on the diverter component, and a collecting component for collecting impurities is provided between the first annular plate and the second annular plate.

[0009] As a preferred solution of the flow equalization device in the negative pressure weighing chamber described in the present invention, the flow splitting component includes:

[0010] The first hollow tube, which is rotatably connected to the intake pipe through a bearing;

[0011] The first gear, which is fixedly installed on the first hollow tube;

[0012] The first rotating shaft, which is rotatably connected to the fixed plate through a bearing;

[0013] The first servo motor, which is fixedly installed on the top of the fixed plate, and the output shaft of the first servo motor is fixedly connected to the first rotating shaft;

[0014] The second gear, which is fixedly installed on the first rotating shaft, and the second gear is meshed with the first gear;

[0015] The first sealing plate, which is fixedly installed on the bottom of the first hollow tube.

[0016] As a preferred solution of the flow equalizing device in the negative pressure weighing chamber of the present invention, wherein: the shunt assembly further includes:

[0017] The second hollow tube, and a plurality of second hollow tubes are fixedly installed on the side wall of the bottom end of the first hollow tube;

[0018] The third hollow tube, which is slidably connected in the second hollow tube;

[0019] The fourth hollow tube, which is slidably connected in the third hollow tube;

[0020] The second sealing plate, which is fixedly installed on one end of the fourth hollow tube.

[0021] As a preferred solution of the flow equalizing device in the negative pressure weighing chamber of the present invention, wherein: the shunt assembly further includes:

[0022] The first cylinder, and a plurality of first cylinders are fixedly installed on the side wall of the bottom end of the first hollow tube;

[0023] The first connecting plate, the piston rod of the first cylinder is fixedly installed with the first connecting plate, and the first connecting plate is fixedly installed on the top of one end of the fourth hollow tube.

[0024] As a preferred solution of the flow equalizing device in the negative pressure weighing chamber of the present invention, wherein: the shunt assembly further includes:

[0025] The support plate, which is fixedly installed on the side wall of the second sealing plate;

[0026] The second rotating shaft, which is rotatably connected to the support plate through a bearing;

[0027] A second servo motor, which is fixedly installed on the top of the support plate, and the output shaft of the second servo motor is fixedly connected to the second rotating shaft.

[0028] As a preferred solution of a flow equalizing device in a negative pressure weighing chamber according to the present invention, wherein: the shunt assembly further includes:

[0029] A U-shaped plate, which is fixedly installed on the bottom of the second rotating shaft;

[0030] A third rotating shaft, which is rotatably connected to the U-shaped plate through a bearing;

[0031] A third servo motor, which is fixedly installed on the side wall of the U-shaped plate, and the output shaft of the third servo motor is fixedly connected to the third rotating shaft;

[0032] A movable rod, which is fixedly installed on the third rotating shaft;

[0033] A cross plate, which is fixedly installed on the bottom of the movable rod;

[0034] A first rigid tube, which is fixedly installed at the bottom end of one end of the fourth hollow tube;

[0035] A second rigid tube, which is fixedly installed on the cross plate;

[0036] A telescopic tube, which is fixedly installed between the first rigid tube and the second rigid tube.

[0037] As a preferred solution of a flow equalizing device in a negative pressure weighing chamber according to the present invention, wherein: the shunt assembly further includes:

[0038] Chute grooves, which are provided at both inner ends of the second hollow tube and the third hollow tube;

[0039] Guide columns, which are fixedly installed at both outer ends of the third hollow tube and the fourth hollow tube, and the guide columns are slidably connected in the chute grooves.

[0040] As a preferred solution of a flow equalizing device in a negative pressure weighing chamber according to the present invention, wherein: the cleaning assembly includes:

[0041] A connecting shaft, which is fixedly installed on the bottom of the first sealing plate;

[0042] A cross bar, which is fixedly installed on the side wall of the bottom end of the connecting shaft;

[0043] Brush filaments, several brush filaments are provided at the bottom of the cross bar, and the brush filaments are in contact with the filter screen.

[0044] As a preferred solution of the flow equalizing device in the negative pressure weighing chamber of the present invention, wherein: the collection assembly includes:

[0045] An annular collection box, the bottom end of the inner cavity of the annular collection box is fixedly installed on the first annular plate, and the top end of the inner cavity of the annular collection box is fixedly installed on the second annular plate;

[0046] A third annular plate, the bottom end of the inner cavity of the third annular plate is slidably connected to the first annular plate, and the top end of the inner cavity of the third annular plate is slidably connected to the second annular plate;

[0047] A second cylinder, a plurality of second cylinders are fixedly installed on the top of the annular collection box, and the piston rod of the second cylinder is fixedly installed on the outer side of the third annular plate through a second connecting plate.

[0048] A method for using the flow equalizing device in the negative pressure weighing chamber, including the following specific steps:

[0049] Step 1: Integrally install the first annular plate and the second annular plate at the air outlet of the air supply box, and connect the air inlet pipe to the air outlet of the air supply box;

[0050] Step 2: When the air enters the air inlet pipe, it will flow out through the first hollow pipe. During this process, the second hard pipe will rotate around the first hollow pipe through the cooperation of the first servo motor, the second gear and the first hollow pipe. At this time, the rotation diameter of the second hard pipe will be repeatedly adjusted through the cooperation of the first cylinder, the second hollow pipe, the third hollow pipe and the fourth hollow pipe. At the same time, the angle of the second hard pipe will be adjusted through the cooperation of the second servo motor and the third servo motor. Thus, the air can flow evenly into the second annular plate;

[0051] Step 3: After the air flows into the second annular plate, it will flow into the first annular plate through the filter screen. At this time, the filter screen will filter the impurities in the air;

[0052] Step 4: After the air flows into the second annular plate, it will flow out evenly through the flow equalizing plate;

[0053] Step 5: When the first hollow pipe rotates, the cross bar will rotate through the connecting shaft. When the cross bar rotates, the impurities on the filter screen will be cleaned by the brush filaments to prevent the filter screen from being blocked;

[0054] Step 6: When the impurities on the filter screen reach a certain amount, the third annular plate will be lifted by the second cylinder until the gap between the first annular plate and the second annular plate is exposed. At this time, the impurities on the filter screen will flow into the annular collection box through the gap between the first annular plate and the second annular plate to process the filtered impurities.

[0055] Compared with the prior art:

[0056] 1. By setting a filter screen, it has the function of filtering the gas flowing into the flow equalizing plate, thereby avoiding the blockage of the flow equalizing plate. In addition, by setting a cleaning component, it has the function of cleaning the impurities on the filter screen. By cleaning the impurities on the filter screen, the blockage of the filter screen can be avoided. In addition, by setting a collection component, it has the function of automatically collecting the impurities on the filter screen without manual participation, with high convenience;

[0057] 2. By setting a flow splitting component, it has the function of evenly placing air in the second annular plate. By evenly placing air in the second annular plate, the wind speed of each part of the working area can be made consistent to a certain extent, which can not only avoid affecting the weighing result, but also help maintain the cleanliness and negative pressure stability of the working area. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 It is a front view schematic diagram of the structure of the present invention;

[0059] Figure 2 For the present invention Figure 1 An enlarged schematic diagram of the structure at A in the present invention;

[0060] Figure 3 For the present invention Figure 2 An enlarged schematic diagram of the structure at A1 in the present invention;

[0061] Figure 4 It is a schematic diagram of the structure of the first annular plate, support rod and second annular plate of the present invention;

[0062] Figure 5 It is a schematic diagram of the structure of the annular collection box of the present invention;

[0063] Figure 6 It is a bottom view schematic diagram of a partial structure of the flow splitting component of the present invention.

[0064] In the figure: the first annular plate 10, the support rod 11, the second annular plate 12, the flow equalizing plate 13, the filter net 14, the fixing plate 15, the air inlet pipe 16, the first hollow pipe 20, the first gear 21, the first rotating shaft 22, the first servo motor 23, the second gear 24, the first sealing plate 25, the second hollow pipe 26, the third hollow pipe 27, the fourth hollow pipe 28, the second sealing plate 29, the first cylinder 30, the first connecting plate 31, the support plate 32, the second rotating shaft 33, the second servo motor 34, the U-shaped plate 35, the third rotating shaft 36, the third servo motor 37, the movable rod 38, the cross plate 39, the first rigid pipe 40, the second rigid pipe 41, the telescopic pipe 42, the sliding groove 43, the guiding column 44, the connecting shaft 50, the cross bar 51, the brush filaments 52, the annular collecting box 53, the second cylinder 54, the second connecting plate 55, the third annular plate 56. Detailed implementation manners

[0065] To make the objectives, technical solutions and advantages of the present invention clearer, the following will further describe in detail the implementation manners of the present invention with reference to the accompanying drawings.

[0066] The present invention provides a flow equalizing device in a negative pressure weighing chamber. Please refer to Figures 1 - 6 , which includes a first annular plate 10 and a second annular plate 12. A flow equalizing plate 13 is fixedly installed at the bottom end of the inner cavity of the first annular plate 10. A fixing plate 15 is fixedly installed at the top end of the inner cavity of the second annular plate 12. An air inlet pipe 16 is fixedly installed on the fixing plate 15. A plurality of support rods 11 are fixedly installed between the first annular plate 10 and the second annular plate 12. A filter net 14 is fixedly installed at the top end of the inner cavity of the first annular plate 10. A flow splitting component for evenly placing air into the second annular plate 12 is provided in the air inlet pipe 16. A cleaning component for cleaning impurities on the filter net 14 is provided on the flow splitting component. A collecting component for collecting impurities is provided between the first annular plate 10 and the second annular plate 12.

[0067] The flow splitting component includes: a first hollow pipe 20, a first gear 21, a first rotating shaft 22, a first servo motor 23, a second gear 24, a first sealing plate 25, a second hollow pipe 26, a third hollow pipe 27, a fourth hollow pipe 28, a second sealing plate 29, a first cylinder 30, a first connecting plate 31, a support plate 32, a second rotating shaft 33, a second servo motor 34, a U-shaped plate 35, a third rotating shaft 36, a third servo motor 37, a movable rod 38, a cross plate 39, a first rigid pipe 40, a second rigid pipe 41, a telescopic pipe 42, a sliding groove 43, a guiding column 44;

[0068] The first hollow tube 20 is rotatably connected in the intake pipe 16 through a bearing, which is preferably the bearing in Patent CN217736027U. The first gear 21 is fixedly installed on the first hollow tube 20. The first rotating shaft 22 is rotatably connected to the fixed plate 15 through a bearing, which is preferably the bearing in Patent CN217736027U. The first servo motor 23 is fixedly installed on the top of the fixed plate 15, and the output shaft of the first servo motor 23 is fixedly connected to the first rotating shaft 22. The second gear 24 is fixedly installed on the first rotating shaft 22, and the second gear 24 is meshed with the first gear 21. The first sealing plate 25 is fixedly installed on the bottom of the first hollow tube 20. A plurality of second hollow tubes 26 are fixedly installed on the side wall at the bottom end of the first hollow tube 20. The third hollow tube 27 is slidably connected in the second hollow tube 26, and a sealing ring can be arranged between the third hollow tube 27 and the second hollow tube 26 according to requirements. The fourth hollow tube 28 is slidably connected in the third hollow tube 27, and a sealing ring can be arranged between the third hollow tube 27 and the fourth hollow tube 28 according to requirements. The second sealing plate 29 is fixedly installed at one end of the fourth hollow tube 28. A plurality of first cylinders 30 are fixedly installed on the side wall at the bottom end of the first hollow tube 20. The piston rod of the first cylinder 30 is fixedly installed with a first connecting plate 31, and the first connecting plate 31 is fixedly installed on the top of one end of the fourth hollow tube 28. The support plate 32 is fixedly installed on the side wall of the second sealing plate 29. The second rotating shaft 33 is rotatably connected to the support plate 32 through a bearing. The second servo motor 34 is fixedly installed on the top of the support plate 32, and the output shaft of the second servo motor 34 is fixedly connected to the second rotating shaft 33. The U-shaped plate 35 is fixedly installed at the bottom of the second rotating shaft 33. The third rotating shaft 36 is rotatably connected in the U-shaped plate 35. The third servo motor 37 is fixedly installed on the side wall of the U-shaped plate 35, and the output shaft of the third servo motor 37 is fixedly connected to the third rotating shaft 36. The movable rod 38 is fixedly installed on the third rotating shaft 36. The cross plate 39 is fixedly installed at the bottom of the movable rod 38. The first rigid tube 40 is fixedly installed at the bottom end of one end of the fourth hollow tube 28. The second rigid tube 41 is fixedly installed on the cross plate 39. The telescopic tube 42 is fixedly installed between the first rigid tube 40 and the second rigid tube 41, and the length of the telescopic tube 42 can be set according to requirements. The inner ends of both ends of the second hollow tube 26 and the third hollow tube 27 are provided with chutes 43. Guide columns 44 are fixedly installed at the outer ends of both ends of the third hollow tube 27 and the fourth hollow tube 28, and the guide columns 44 are slidably connected in the chutes 43.

[0069] The cleaning assembly includes: a connecting shaft 50, a cross bar 51, and brush filaments 52;

[0070] The connecting shaft 50 is fixedly installed on the bottom of the first sealing plate 25. The cross bar 51 is fixedly installed on the side wall at the bottom end of the connecting shaft 50. A plurality of brush filaments 52 are arranged at the bottom of the cross bar 51, and the brush filaments 52 are in contact with the filter net 14.

[0071] The collection component includes: a circular collection box 53, a second cylinder 54, a second connecting plate 55, and a third circular plate 56;

[0072] The bottom end of the inner cavity of the circular collection box 53 is fixedly installed on the first circular plate 10, and the top end of the inner cavity of the circular collection box 53 is fixedly installed on the second circular plate 12. A pipe with a valve is provided at the bottom end of the circular collection box 53. The bottom end of the inner cavity of the third circular plate 56 is slidably connected to the first circular plate 10, and the top end of the inner cavity of the third circular plate 56 is slidably connected to the second circular plate 12. Sealing rings can be provided at the connection between the third circular plate 56 and the first circular plate 10 and the second circular plate 12 according to requirements. A number of second cylinders 54 are fixedly installed on the top of the circular collection box 53, and the piston rods of the second cylinders 54 are fixedly installed on the outer side of the third circular plate 56 through the second connecting plate 55.

[0073] A method for using a flow equalizing device in a negative pressure weighing chamber includes the following specific steps:

[0074] Step 1: Integrally install the first circular plate 10 and the second circular plate 12 at the air outlet of the air supply box, and connect the intake pipe 16 to the air outlet of the air supply box;

[0075] Step 2: When the air enters the intake pipe 16, it will flow out through the first hollow pipe 20. During this process, the second hard pipe 41 will rotate around the first hollow pipe 20 through the cooperation of the first servo motor 23, the second gear 24, and the first hollow pipe 20. At this time, the rotation diameter of the second hard pipe 41 will be repeatedly adjusted through the cooperation of the first cylinder 30, the second hollow pipe 26, the third hollow pipe 27, and the fourth hollow pipe 28. At the same time, the angle of the second hard pipe 41 will be adjusted through the cooperation of the second servo motor 34 and the third servo motor 37. Thus, the air can flow evenly into the second circular plate 12;

[0076] Step 3: After the air flows into the second circular plate 12, it will flow into the first circular plate 10 through the filter net 14. At this time, the filter net 14 will filter the impurities in the air;

[0077] Step 4: After the air flows into the second circular plate 12, it will flow out evenly through the flow equalizing plate 13;

[0078] Step 5: When the first hollow pipe 20 rotates, the cross bar 51 will rotate through the connecting shaft 50. When the cross bar 51 rotates, the brush filaments 52 will clean the impurities on the filter net 14 to prevent the filter net 14 from being blocked;

[0079] Step Six: When the impurities on the filter screen 14 reach a certain amount, the second cylinder 54 will cause the third annular plate 56 to rise until the gap between the first annular plate 10 and the second annular plate 12 is exposed. At this time, the impurities on the filter screen 14 will flow into the annular collection box 53 through the gap between the first annular plate 10 and the second annular plate 12, so as to be able to process the filtered impurities.

[0080] Although the present invention has been described above with reference to the embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the disclosed embodiments of the present invention can be combined with each other in any way. The exhaustive description of these combinations is not given in this specification only for the consideration of saving space and resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A flow equalizing device in a negative pressure weighing chamber, comprising a first annular plate (10) and a second annular plate (12), wherein a flow equalizing plate (13) is fixedly mounted at the bottom end of the inner cavity of the first annular plate (10), a fixed plate (15) is fixedly mounted at the top end of the inner cavity of the second annular plate (12), an air inlet pipe (16) is fixedly mounted on the fixed plate (15), characterized in that: A plurality of support rods (11) are fixedly installed between the first annular plate (10) and the second annular plate (12); a filter screen (14) is fixedly installed at the top of the inner cavity of the first annular plate (10); a flow distribution component for evenly distributing air in the second annular plate (12) is provided in the air intake pipe (16); a cleaning component for cleaning impurities on the filter screen (14) is provided on the flow distribution component; and a collecting component for collecting impurities is provided between the first annular plate (10) and the second annular plate (12).

2. A flow balancing device in a negative pressure weighing chamber according to claim 1, characterized in that: The diversion component comprises: A first hollow tube (20), the first hollow tube (20) being rotatably connected to the air intake pipe (16) via a bearing; A first gear (21), wherein the first gear (21) is fixedly mounted on the first hollow tube (20); A first rotating shaft (22), the first rotating shaft (22) being rotatably connected to the fixed plate (15) via a bearing; A first servo motor (23), wherein the first servo motor (23) is fixedly mounted on the top of the fixed plate (15), and an output shaft of the first servo motor (23) is fixedly connected to the first rotating shaft (22); A second gear (24), wherein the second gear (24) is fixedly mounted on the first rotating shaft (22), and the second gear (24) is meshingly connected with the first gear (21); A first sealing plate (25), wherein the first sealing plate (25) is fixedly mounted on the bottom of the first hollow tube (20).

3. A flow balancing device in a negative pressure weighing chamber according to claim 2, characterized in that: The diversion component also includes: Second hollow tubes (26), a plurality of second hollow tubes (26) are fixedly mounted on the bottom side wall of the first hollow tube (20); a third hollow tube (27), wherein the third hollow tube (27) is slidably connected in the second hollow tube (26); a fourth hollow tube (28), wherein the fourth hollow tube (28) is slidably connected in the third hollow tube (27); A second sealing plate (29), wherein the second sealing plate (29) is fixedly mounted on one end of the fourth hollow tube (28).

4. The flow balancing device in a negative pressure weighing chamber according to claim 3, characterized in that: The diversion component also includes: A first cylinder (30), a plurality of first cylinders (30) are fixedly mounted on the side wall of the bottom end of the first hollow tube (20); A first connecting plate (31), the piston rod of the first cylinder (30) is fixedly mounted on the first connecting plate (31), and the first connecting plate (31) is fixedly mounted on the top of one end of the fourth hollow tube (28).

5. A flow balancing device in a negative pressure weighing chamber according to claim 4, characterized in that: The diversion component also includes: A support plate (32), wherein the support plate (32) is fixedly mounted on a side wall of the second sealing plate (29); A second rotating shaft (33), the second rotating shaft (33) being rotatably connected to the support plate (32) via a bearing; A second servo motor (34), wherein the second servo motor (34) is fixedly mounted on the top of the support plate (32), and an output shaft of the second servo motor (34) is fixedly connected to the second rotating shaft (33).

6. A flow balancing device in a negative pressure weighing chamber according to claim 5, characterized in that: The diversion component also includes: A U-shaped plate (35), wherein the U-shaped plate (35) is fixedly mounted on the bottom of the second rotating shaft (33); A third rotating shaft (36), the third rotating shaft (36) being rotatably connected to the U-shaped plate (35) via a bearing; A third servo motor (37), wherein the third servo motor (37) is fixedly mounted on the side wall of the U-shaped plate (35), and an output shaft of the third servo motor (37) is fixedly connected to the third rotating shaft (36); A movable rod (38), wherein the movable rod (38) is fixedly mounted on the third rotating shaft (36); A transverse plate (39), wherein the transverse plate (39) is fixedly mounted on the bottom of the movable rod (38); A first hard tube (40), the first hard tube (40) being fixedly mounted on the bottom end of one end of the fourth hollow tube (28); A second hard tube (41), wherein the second hard tube (41) is fixedly mounted on the transverse plate (39); A telescopic tube (42), wherein the telescopic tube (42) is fixedly installed between the first rigid tube (40) and the second rigid tube (41).

7. A flow balancing device in a negative pressure weighing chamber according to claim 6, characterized in that: The diversion component also includes: A slide groove (43), wherein both ends of the inner sides of the second hollow tube (26) and the third hollow tube (27) are provided with a slide groove (43); A guide column (44) is fixedly installed at both ends of the outer sides of the third hollow tube (27) and the fourth hollow tube (28), and the guide column (44) is slidably connected in the slide groove (43).

8. The flow balancing device in a negative pressure weighing chamber according to claim 2, characterized in that: The cleaning component includes: A connecting shaft (50), wherein the connecting shaft (50) is fixedly mounted on the bottom of the first sealing plate (25); A cross bar (51), wherein the cross bar (51) is fixedly mounted on a side wall of a bottom end of the connecting shaft (50); Brush wires (52), a plurality of brush wires (52) are provided at the bottom of the cross bar (51), and the brush wires (52) are in contact with the filter screen (14).

9. A flow balancing device in a negative pressure weighing chamber according to claim 8, characterized in that: The collection component comprises: An annular collection box (53), wherein the bottom end of the inner cavity of the annular collection box (53) is fixedly mounted on the first annular plate (10), and the top end of the inner cavity of the annular collection box (53) is fixedly mounted on the second annular plate (12); A third annular plate (56), wherein the bottom end of the inner cavity of the third annular plate (56) is slidably connected to the first annular plate (10), and the top end of the inner cavity of the third annular plate (56) is slidably connected to the second annular plate (12); Second cylinders (54), a plurality of second cylinders (54) are fixedly mounted on the top of the annular collecting box (53), and piston rods of the second cylinders (54) are fixedly mounted on the outer side of the third annular plate (56) via a second connecting plate (55).

10. A method for using a flow equalizing device in a negative pressure weighing chamber, characterized in that: The specific steps are as follows: Step 1: Install the first annular plate (10) and the second annular plate (12) as a whole at the air outlet of the air supply box, and connect the air inlet pipe (16) to the air outlet of the air supply box; Step 2: When the wind enters the air intake pipe (16), it will flow out through the first hollow pipe (20). During this process, the first servo motor (23), the second gear (24) and the first hollow pipe (20) cooperate to make the second hard pipe (41) rotate with the first hollow pipe (20) as the center point. At this time, the rotation diameter of the second hard pipe (41) is repeatedly adjusted through the cooperation of the first cylinder (30), the second hollow pipe (26), the third hollow pipe (27) and the fourth hollow pipe (28). At the same time, the angle of the second hard pipe (41) is adjusted through the cooperation of the second servo motor (34) and the third servo motor (37). Thus, the wind can flow into the second annular plate (12) evenly. Step 3: After the wind flows into the second annular plate (12), it will pass through the filter net (14) and flow into the first annular plate (10). At this time, impurities in the wind will be filtered through the filter net (14); Step 4: After the wind flows into the second annular plate (12), it will flow out evenly through the flow equalizing plate (13); Step 5: When the first hollow tube (20) rotates, the cross bar (51) is rotated via the connecting shaft (50). When the cross bar (51) rotates, the brush wire (52) cleans the impurities on the filter screen (14) to prevent the filter screen (14) from being blocked; Step 6: When the amount of impurities on the filter screen (14) reaches a certain level, the third annular plate (56) is raised by the second cylinder (54) until the gap between the first annular plate (10) and the second annular plate (12) is exposed. At this time, the impurities on the filter screen (14) pass through the gap between the first annular plate (10) and the second annular plate (12) and flow into the annular collection box (53) so that the filtered impurities can be processed.

Images