Quantitative feeding device for dry powder

Abstract

The quantitative dry powder adding device comprises an outer bin, an inner bin, a cam and a movable assembly, the outer bin is used for being fixed to a discharging opening in the lower end of a storage bin, and the outer bin is provided with a feeding opening and a discharging opening; the inner bin is provided with a plurality of stock bins, and a piston block is arranged in each stock bin; the inner bin is rotationally mounted on the inner side of the outer bin; the cam is fixed to the center of the inner bin. The movable assembly comprises a guide cylinder, a movable rod installed in the guide cylinder and a spring arranged on the movable rod in a sleeving mode. The multiple movable assemblies are arranged in one-to-one correspondence with the stock bins, one end of a movable rod in each movable assembly is connected with the corresponding piston block, the other end of the movable rod is provided with a rolling wheel, and the rolling wheels on the movable rods abut against the cam. According to the batch type quantitative feeding device, batch type quantitative feeding can be carried out, and meanwhile the problem that due to incomplete discharging of the stock bin, the internal capacity of the stock bin is changed due to material residues can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of feeding equipment, in particular to a dry powder quantitative feeding device. Background Art

[0002] Dry powder materials are widely used in many fields such as mineral processing, chemical production, construction, and water treatment. In the process of using dry powder materials, a dosing device is usually used to add the dry powder materials in the silo to the production equipment. For example, in the field of water treatment, during the flocculant dissolution process, it is usually necessary to add a certain amount of flocculant dry powder to the dissolution tank. At present, the main method of adding powder materials is to add the flocculant dry powder into the storage silo in a centralized manner, and discharge the flocculant dry powder in the storage silo from its outlet through the spiral feeding mechanism provided at the bottom of the storage silo to complete the addition of flocculant dry powder. This feeding method is suitable for the continuous feeding needs of powder materials, but is not suitable for the intermittent feeding needs of powder materials, and the feeding amount each time is difficult to accurately control. Utility Model Content

[0003] In order to solve the technical problems existing in the background technology, the utility model proposes a dry powder quantitative dosing device.

[0004] The utility model provides a dry powder quantitative dosing device, comprising: an outer bin, an inner bin, a cam and a movable component, wherein:

[0005] The outer bin is used to be fixed at the discharge port at the lower end of the storage bin. The outer bin is an annular structure, which has a feed port connected to the discharge port of the storage bin and a discharge port located below the feed port and in the same radial direction as the feed port;

[0006] The inner bin is an annular structure, and its outer ring surface is provided with a number of circumferentially evenly distributed bins, each of which is provided with a piston block; the inner bin is rotatably mounted on the inner side of the outer bin, and its outer ring surface is slidably fitted with the inner ring surface of the outer bin;

[0007] The cam is fixed at the center of the inner bin, and the near rest point of the cam is located directly below the feed port of the outer bin and faces the feed port, and the far rest point of the cam is located directly above the discharge port of the outer bin and faces the discharge port;

[0008] The movable assembly includes a guide cylinder, a moving rod which is axially movable and installed in the guide cylinder and has both ends extending outside the guide cylinder, and a spring which is sleeved on the moving rod and has both ends axially constrained by the moving rod and the guide cylinder respectively;

[0009] There are multiple movable components, which are arranged in one-to-one correspondence with each bin. The guide cylinders in each movable component are fixed to the inner side of the inner bin and rotate with the rotation of the inner bin. One end of the moving rod in each movable component extends into the corresponding bin to be connected with the piston block in the bin. The other ends of the moving rods are respectively installed with rollers, and the rollers on each moving rod are respectively abutted against the cam. When the movable component moves to the far rest point of the cam, the material in the bin is pushed out from the discharge port by the piston block.

[0010] Preferably, it further includes a driving mechanism for driving the rotation of the inner bin.

[0011] Preferably, it further includes a support frame. The support frame includes a base and a mounting plate. The inner bin is fixedly installed on the mounting plate. The driving mechanism is fixedly installed on the base and connected to the mounting plate to drive the inner bin to rotate along the inner peripheral surface of the outer bin by driving the rotation of the mounting plate; the guide cylinder in the movable component is fixedly connected to the inner bin or fixedly connected to the mounting plate; the cam is fixedly connected to the outer bin or fixedly connected to the base.

[0012] Preferably, the cam is fixedly connected to the base through a fixed shaft.

[0013] Preferably, the guide cylinder in the movable component is fixedly connected to the mounting plate.

[0014] Preferably, the moving rod is an adjustable-length movable rod.

[0015] Preferably, the moving rod includes a sleeve rod and a core rod threadedly assembled inside the sleeve rod. One end of the sleeve rod is fixedly connected to the piston block, and one end of the core rod is connected to the roller.

[0016] Preferably, end caps are respectively provided at both ends of the guide cylinder, and the moving rod passes through the end caps at both ends to be respectively connected to the corresponding piston block and roller.

[0017] Preferably, an upper stop block fixed to it is provided inside the guide cylinder, a lower stop block fixed to it is provided on the moving rod, and the lower stop block is located on the side of the upper stop block away from the piston block; both ends of the spring are respectively abutted against the upper stop block and the lower stop block.

[0018] Preferably, a limit block fixed to it is further provided inside the guide cylinder, and the limit block is located between the upper stop block and the lower stop block. The distance between the limit block and the lower stop block is equal to the lift of the cam.

[0019] Preferably, the contour line of the cam includes a first arc segment with a radius of R1, a second arc segment with a radius of R2, and a straight line segment connecting the first arc segment and the second arc segment, and R2 > R1, and R2 - R1 = the distance between the limit block and the lower stop block.

[0020] Preferably, the discharge port is a flared port.

[0021] In the utility model, a feed port docking with the discharge port of the storage bin and a discharge port located below the feed port and in the same radial direction as the feed port are arranged in the outer bin; a plurality of circumferentially evenly distributed bins are arranged on the outer annular surface of the inner bin, and a piston block is arranged in each bin. At the same time, the inner bin is rotatably installed on the inner side of the outer bin, and the outer annular surface of the inner bin is slidably fitted with the inner annular surface of the outer bin, so that the material in the bin is blocked by the outer bin before being transferred into the discharge port. The cam is fixed to the central part of the inner bin, and the near rest point of the cam is located directly below the feed port of the outer bin and facing the feed port, and the far rest point of the cam is located directly above the discharge port of the outer bin and facing the discharge port; one end of the moving rod in each movable component is respectively extended into the corresponding bin to connect with the piston block in the bin, and the other end of the moving rod is respectively installed with a roller, and the roller on each moving rod is respectively against the cam, and when the movable component moves to the far rest point of the cam, the material in the bin is pushed out of the discharge port through the piston block. The device can realize intermittent quantitative feeding, and can adjust the amount of dry powder added per unit time by adjusting the rotation speed of the inner bin during the feeding process, so as to achieve feeding on demand. In addition, the structural design of the device can also avoid the problem of changes in the internal capacity of the silo due to material residue caused by incomplete discharge of the silo, thereby ensuring the accuracy of feeding. And by changing the thickness of the piston block in the silo, or by changing the position of the piston block in the silo under the initial state, the silo capacity can be adjusted, and then the device can adjust the single feeding amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a front structural schematic diagram of a dry powder quantitative dosing device proposed by the utility model;

[0023] Figure 2 This is a side sectional view of a dry powder quantitative dosing device proposed by the utility model;

[0024] Figure 3 The utility model discloses a structural schematic diagram of a cam in a dry powder quantitative dosing device. DETAILED DESCRIPTION

[0025] Reference Figure 1-2 The utility model provides a dry powder quantitative dosing device, comprising: an outer bin 1, an inner bin 2, a cam 3 and a movable component 4, wherein:

[0026] The outer bin 1 is used to be fixed at the discharge port at the lower end of the storage bin 5. The outer bin 1 is an annular structure, which has a feed port a1 docked with the discharge port of the storage bin 5 and a discharge port a2 located below the feed port a1 and in the same radial direction as the feed port a1. The inner bin 2 is an annular structure, and its outer ring surface is provided with a plurality of circumferentially evenly distributed bins b, and each bin b is provided with a piston block 6; the inner bin 2 is rotatably installed on the inner side of the outer bin 1, and its outer ring surface is slidably fitted with the inner ring surface of the outer bin 1, so that each bin b on the inner bin 2 is docked with the feed port a1 and the discharge port a2 in turn, so that the material is loaded at the feed port a1 and discharged at the discharge port a2.

[0027] The cam 3 is fixed at the center of the inner bin 2, and the near rest point of the cam 3 is located directly below the feed port a1 of the outer bin 1 and faces the feed port a1, and the far rest point of the cam 3 is located directly above the discharge port a2 of the outer bin 1 and faces the discharge port a2. The movable assembly 4 includes a guide cylinder 41, a moving rod 42 which is axially movable and installed in the guide cylinder 41 and has both ends extending to the outside of the guide cylinder 41, and a spring 43 which is sleeved on the moving rod 42 and has both ends axially constrained by the moving rod 42 and the guide cylinder 41, respectively. There are multiple movable components 4, which are arranged one by one corresponding to each silo b, and the guide cylinder 41 in each movable component 4 is fixed to the inner side of the inner silo 2 and rotates with the rotation of the inner silo 2. One end of the moving rod 42 in each movable component 4 extends into the corresponding silo b to connect with the piston block 6 in the silo b. The other end of the moving rod 42 is respectively installed with a roller 7, and the roller 7 on each moving rod 42 is respectively against the cam 3. When the movable component 4 moves to the far rest point of the cam 3, the material in the silo b is pushed out from the discharge port a2 through the piston block 6. The specific working method is as follows:

[0028] When the inner bin 2 rotates, the movable component 4 moves with it, and then the roller 7 in the movable component 4 rolls along the outer contour of the cam 3. When one of the bins b is in a docking state with the discharge port a2, the roller 7 on the movable component 4 corresponding to the bin b also rotates to the far rest point of the cam 3. At this time, the roller 7 pushes the moving rod 42 to push the piston block 6 toward the discharge port a2, and then the material in the bin b is ejected from the bin b, thereby avoiding incomplete discharge of the bin b, which causes the internal capacity of the bin b to change due to residual material, thereby affecting the feeding accuracy.

[0029] Furthermore, end covers are respectively provided at both ends of the guide cylinder 41, and the moving rod 42 passes through the end covers at both ends to connect to the corresponding piston blocks 6 and rollers 7 respectively. The end covers can not only play a good sealing role, but also guide and support the moving rod 42, so that the movement of the moving rod 42 is smoother.

[0030] Further, a dry powder metering and feeding device proposed by the present utility model further includes a driving mechanism 8 and a support frame for driving the inner bin 2 to rotate. The support frame includes a base 9 and a mounting plate 10, wherein: the inner bin 2 is fixedly installed on the mounting plate 10, and the driving mechanism 8 is fixedly installed on the base 9 and connected to the mounting plate 10 to drive the inner bin 2 to rotate along the inner circumferential surface of the outer bin 1 by driving the mounting plate 10 to rotate. The guide cylinder 41 in the movable assembly 4 is fixedly connected to the inner bin 2 or the mounting plate 10, so that the position of the movable assembly 4 is relatively fixed with respect to the inner bin 2 and rotates synchronously with the rotation of the inner bin 2. The cam 3 is fixedly connected to the outer bin 1 or the base 9, so that the relative position of the cam 3 and the outer bin 1 is fixed, and then its far rest point always faces the discharge port a2, and its near rest point always faces the feed port a1. During operation, the driving mechanism 8 is used to drive the inner bin 2 and each movable assembly 4 to rotate.

[0031] Further, the specific installation method of the cam 3 is: the cam 3 is fixedly connected to the base 9 through a fixed shaft, so that the cam 3 does not rotate with the rotation of the inner bin 2. The specific installation method of the movable assembly 4 is: the guide cylinder 41 in the movable assembly 4 is fixedly connected to the mounting plate 10, so as to connect the inner bin 2 and the movable assembly 4 together through the mounting plate 10 to form an integral body.

[0032] In addition, in this embodiment, the moving rod 42 includes a sleeve rod and a core rod threadedly assembled inside the sleeve rod. One end of the sleeve rod is fixedly connected to the piston block 6, and one end of the core rod is connected to the roller 7. This structural design enables the length of the moving rod 42 to be adjustable. When the length of the moving rod 42 needs to be adjusted, only the core rod needs to be rotated to adjust the screwing-out amount of the core rod. Then, by adjusting the length of the movable rod, the capacity of the bin b can be adjusted.

[0033] In this embodiment, an upper stop block 11 fixed to the guide cylinder 41 is provided inside the guide cylinder 41, a lower stop block 12 fixed to the moving rod 42 is provided on the moving rod 42, and the lower stop block 12 is located on the side of the upper stop block 11 away from the piston block 6; both ends of the spring 43 are respectively abutted against the upper stop block 11 and the lower stop block 12, so as to axially constrain both ends of the spring 43 by the upper stop block 11 and the lower stop block 12.

[0034] Furthermore, in this embodiment, a limiting block 13 fixed to the guiding cylinder 41 is also arranged inside the guiding cylinder 41, and the limiting block 13 is located between the upper stop block 11 and the lower stop block 12. The distance between the limiting block 13 and the lower stop block 12 is equal to the lift of the cam 3. The lift is the geometric difference between the lowest point and the highest point of the contour line of the cam 3. The roller 7 rolls along the outer contour of the cam 3. When it moves to the far rest point of the cam 3, the roller 7 pushes the moving rod 42 in the direction of the piston block 6, so that the lower stop block 12 moves downward and compresses the spring 43 to the limiting block 13, and then the material in the bin b is pushed out. When the roller 7 moves to the near rest point of the cam 3, the roller 7 drives the moving rod 42 to descend accordingly, and then drives the piston block 6 to descend, so that the material in the storage bin 5 falls into the bin b through the feed port a1.

[0035] Specifically: Referring to Figure 3 , the contour line of the cam 3 includes a first arc segment 31 with a radius of R1, a second arc segment 32 with a radius of R2, and a straight line segment 33 connecting the first arc segment 31 and the second arc segment 32, and R2 > R1, and R2 - R1 = the distance between the limiting block 13 and the lower stop block 12. During the process of the roller 7 rolling along the outer contour of the cam 3, due to R2 > R1, when rotating the first arc segment 31, the roller 7 pushes the moving rod 42 under the push of the cam 3 to push the material in the bin b towards the discharge port a2, and uses the lower stop block 12 to compress the spring 43 to the limiting block 13. When the roller 7 disengages from the first arc segment 31, the roller 7 drives the moving rod 42 and the piston block 6 to gradually reset under the boost of the spring 43.

[0036] Furthermore, the discharge port a2 in this embodiment is a flared port to facilitate discharging.

[0037] In the utility model, a feed port a1 docking with the discharge port of the storage bin 5 and a discharge port a2 located below the feed port a1 and in the same radial direction as the feed port a1 are provided on the outer bin 1; a plurality of circumferentially evenly distributed bins b are provided on the outer ring surface of the inner bin 2, and a piston block 6 is provided in each bin b. At the same time, the inner bin 2 is rotatably installed on the inner side of the outer bin 1, and the outer ring surface of the inner bin 2 is slidably fitted with the inner ring surface of the outer bin 1, so that the material in the bin b is blocked by the outer bin 1 before being transferred to the discharge port a2. The cam 3 is fixed to the center of the inner bin 2, and the near rest point of the cam 3 is located directly below the feed port a1 of the outer bin 1 and faces the feed port a1, and the far rest point of the cam 3 is located directly above the discharge port a2 of the outer bin 1 and faces the discharge port a2; one end of the moving rod 42 in each movable component 4 extends into the corresponding bin b to connect with the piston block 6 in the bin b, and the other end of the moving rod 42 is respectively installed with a roller 7, and the roller 7 on each moving rod 42 is respectively against the cam 3, and when the movable component 4 moves to the far rest point of the cam 3, the material in the bin b is pushed out of the discharge port a2 through the piston block 6. The device can realize intermittent quantitative feeding, and can adjust the amount of dry powder added per unit time by adjusting the rotation speed of the inner bin during the feeding process, so as to achieve feeding on demand. In addition, the device can also avoid the problem of changes in the internal capacity of the bin b due to material residue caused by incomplete discharge of the bin b, thereby ensuring the accuracy of feeding. And by changing the thickness of the piston block 6 in the silo b, or by changing the position of the piston block 6 in the silo b in the initial state, the capacity of the silo b can be adjusted, and then the device can adjust the single feeding amount.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A dry powder quantitative dosing device, characterized in that: include: An outer bin (1), an inner bin (2), a cam (3) and a movable assembly (4), wherein: The outer bin (1) is used to be fixed at the discharge port at the lower end of the storage bin (5). The outer bin (1) is an annular structure, and has a feed port (a1) connected to the discharge port of the storage bin (5) and a discharge port (a2) located below the feed port (a1) and in the same radial direction as the feed port (a1); The inner bin (2) is an annular structure, and its outer ring surface is provided with a plurality of circumferentially evenly distributed material bins (b), and each material bin (b) is provided with a piston block (6); the inner bin (2) is rotatably mounted on the inner side of the outer bin (1), and its outer ring surface is slidably fitted with the inner ring surface of the outer bin (1); The cam (3) is fixed at the center of the inner bin (2), and the near rest point of the cam (3) is located directly below the feed port (a1) of the outer bin (1) and faces the feed port (a1), and the far rest point of the cam (3) is located directly above the discharge port (a2) of the outer bin (1) and faces the discharge port (a2); The movable assembly (4) comprises a guide cylinder (41), a moving rod (42) which is axially movable and installed in the guide cylinder (41) and has both ends extending outside the guide cylinder (41), and a spring (43) which is sleeved on the moving rod (42) and has both ends axially constrained by the moving rod (42) and the guide cylinder (41). There are multiple movable components (4), which are arranged one by one corresponding to each material bin (b), and the guide cylinder (41) in each movable component (4) is fixed to the inner side of the inner bin (2) and rotates with the rotation of the inner bin (2). One end of the moving rod (42) in each movable component (4) extends into the corresponding material bin (b) to connect with the piston block (6) in the material bin (b), and the other end of the moving rod (42) is respectively installed with a roller (7), and the roller (7) on each moving rod (42) is respectively abutted against the cam (3), and when the movable component (4) moves to the far rest point of the cam (3), the material in the material bin (b) is pushed out from the discharge port (a2) through the piston block (6).

2. The dry powder quantitative dosing device according to claim 1, characterized in that: It also includes a driving mechanism (8) for driving the inner bin (2) to rotate.

3. The dry powder quantitative dosing device according to claim 2, characterized in that: The device also includes a support frame, which includes a base (9) and a mounting plate (10); the inner bin (2) is fixedly mounted on the mounting plate (10); the driving mechanism (8) is fixedly mounted on the base (9) and connected to the mounting plate (10) so as to drive the inner bin (2) to rotate along the inner circumference of the outer bin (1) by driving the mounting plate (10) to rotate; the guide cylinder (41) in the movable component (4) is fixedly connected to the inner bin (2) or to the mounting plate (10); and the cam (3) is fixedly connected to the outer bin (1) or to the base (9); The cam (3) is fixedly connected to the base (9) via a fixed shaft; The guide cylinder (41) in the movable assembly (4) is fixedly connected to the mounting plate (10).

4. The dry powder quantitative dosing device according to claim 1, characterized in that: The moving rod (42) is a movable rod with adjustable length.

5. The dry powder quantitative dosing device according to claim 4, characterized in that: The moving rod (42) comprises a sleeve rod and a core rod threadedly assembled inside the sleeve rod, one end of the sleeve rod is fixedly connected to the piston block (6), and one end of the core rod is connected to the roller (7).

6. The dry powder quantitative dosing device according to claim 1, characterized in that: End caps are respectively provided at the ends of both ends of the guide cylinder (41), and the moving rod (42) passes through the end caps at both ends to be connected to the corresponding piston block (6) and roller (7).

7. The dry powder quantitative dosing device according to claim 1, characterized in that: An upper stopper (11) fixed thereto is provided in the guide cylinder (41), and a lower stopper (12) fixed thereto is provided on the moving rod (42), and the lower stopper (12) is located on a side of the upper stopper (11) away from the piston block (6); both ends of the spring (43) are respectively in contact with the upper stopper (11) and the lower stopper (12).

8. The dry powder quantitative dosing device according to claim 7, characterized in that: A limit block (13) fixed to the guide cylinder (41) is also provided inside the guide cylinder (41), and the limit block (13) is located between the upper block (11) and the lower block (12), and the distance between the limit block (13) and the lower block (12) is equal to the lift of the cam (3).

9. The dry powder quantitative dosing device according to claim 8, characterized in that: The contour line of the cam (3) comprises a first arc segment (31) with a radius of R1, a second arc segment (32) with a radius of R2, and a straight line segment (33) connecting the first arc segment (31) and the second arc segment (32), wherein R2>R1, and R2-R1=the distance between the limit block (13) and the lower stop block (12).

10. The dry powder quantitative dosing device according to any one of claims 1 to 9, characterized in that: The discharge port (a2) is a bell-shaped port.

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