Precise and stable powder feeding system

Abstract

The utility model discloses a fine and stable powder feeding system. Relates to the field of mine filling and comprises a mounting table and a double-helix metering scale, a support is arranged on the mounting table, a fulcrum is arranged on the support, and a groove matched with the fulcrum is formed in the bottom of the double-helix metering scale; the support supports the double-helix metering scale through a fulcrum; a feeding hole is formed in the upper end of the double-helix metering scale and is communicated with a double-impeller feeding machine; the double-impeller feeding machine and the double-pipe spiral metering scale are matched with a single-impeller and single-pipe spiral metering use mode, so that the ratio of the maximum conveying capacity to the minimum conveying capacity reaches 1: 10 or above; meanwhile, the large-material-opening double-impeller feeding machine is adopted, the blank blanking time is prolonged, the partition plates are arranged in the middle of the blades in a breaking mode, the spiral blades on the two sides are arranged in a staggered mode, and continuous and stable blanking is achieved.

Description

Technical Field

[0001] The utility model relates to the field of mine filling, in particular to a precise and stable powder feeding system. Background Art

[0002] In the filling industry, it is often necessary to continuously convey and measure a variety of powdered materials (such as cement, fly ash, etc.) to achieve a suitable lime-sand ratio. Due to the characteristics of the filling field, the powder conveying is required to meet the needs of high lime-sand ratio and large amount, as well as the needs of low lime-sand ratio and small amount. At the same time, the conveying process should be continuous and uniform, and the measurement should be accurate and fluctuate little. The ratio of the maximum conveying volume to the minimum conveying volume of the commonly used spiral weighing and conveying devices is mostly 1:5, which cannot meet the needs of the filling 1:10 conveying range. The large range of changes in the powder volume will inevitably bring about large fluctuations in the discharge of materials, and the unevenness will be aggravated. The large changes in the filling rate of the powder in the spiral tube will also affect the tare weight, resulting in inaccurate measurement. Utility Model Content

[0003] In order to achieve continuous stable dynamic feeding and precise weighing under the condition of a large range of conveying range changes, the present application provides a precise and stable powder feeding system.

[0004] The present application provides a precise and stable powder feeding system, which adopts the following technical solutions:

[0005] A precise and stable powder feeding system comprises a mounting platform and a double-screw metering scale, wherein a support is provided on the mounting platform, a fulcrum is provided on the support, a groove matching the fulcrum is provided on the bottom of the double-screw metering scale; the support supports the double-screw metering scale via the fulcrum; a feed port is provided at the upper end of the double-screw metering scale, and the feed port is connected to a double-impeller feeder.

[0006] Optionally, a feeding port is provided at the upper end of the double-impeller feeder, and a gate valve is provided at the feeding port.

[0007] Optionally, the double impeller feeder includes a box and two impeller assemblies, the box is connected to the double spiral metering scale; the two impeller assemblies are rotatably connected in the box; the impeller assembly includes a rotating shaft, and the rotating shaft is provided with two groups of spiral blades with opposite spiral directions along its own length direction.

[0008] Optionally, a middle partition is provided between the two groups of spiral blades, and end partitions are provided at both ends of the two spiral blades.

[0009] Optionally, a discharge port is provided on a side of the double-screw weighing scale close to the tension sensor, and the discharge port is connected to a feed port of a screw conveyor via a soft connecting tarpaulin.

[0010] Optionally, the weighing device is a tension sensor, one end of which is connected to the upper side of the double-screw weighing scale, and the other end is suspended from the ceiling.

[0011] Optionally, a large-section straight-through flexible connection is used between the double-impeller feeder and the double-screw metering scale.

[0012] Optionally, the double-screw weighing scale is provided with a rotation speed sensor.

[0013] In summary, this application includes the following beneficial technical effects:

[0014] This application uses a double-impeller feeder and a double-tube spiral metering scale, in conjunction with a single-impeller + single-tube spiral metering method, to achieve a maximum conveying volume to minimum conveying volume ratio of more than 1:10; at the same time, a large-mouth double-impeller feeder is used to extend the blanking time, a partition is set in the middle of the blades, and the spiral blades on both sides are staggered to achieve continuous and stable material discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the overall structural diagram of a precise and stable powder feeding system of the present application;

[0016] Figure 2 This is a cross-sectional view of the overall structure of a precise and stable powder feeding system of the present application;

[0017] Figure 3 yes Figure 1 The overall structure diagram of the medium double impeller feeder;

[0018] Figure 4 yes Figure 3 Structural diagram of the impeller assembly.

[0019] Description of reference numerals:

[0020] 1. Gate valve; 2. Double impeller feeder; 21. Impeller assembly; 22. Box; 23. End partition; 24. Middle partition; 25. Spiral blade; 26. Rotating shaft; 3. Double spiral weighing scale; 4. Screw conveyor; 5. Weighing adjustment control system; 6. Tension sensor; 7. First soft connection; 8. Support; 9. Speed ​​sensor; 10. First variable frequency motor; 11. Second variable frequency motor; 12. Connecting tarpaulin; 13. Mounting table. DETAILED DESCRIPTION

[0021] The following is combined with Figure 1-4 This application is described in further detail.

[0022] The embodiment of the present application discloses a precise and stable powder feeding system, which includes a mounting platform 13 and a double-helix weighing scale 3. The motor on the double-helix weighing scale 3 for driving itself is a second variable frequency motor 11. A support 8 is provided on the mounting platform 13, and a fulcrum is provided on the support 8. A groove matching the fulcrum is provided at the bottom of the right side of the double-helix weighing scale 3, and the double-helix weighing scale 3 can rotate when placed on the fulcrum; a tension sensor 6 is provided on the top left side, and one end of the tension sensor 6 is connected to the double-helix weighing scale 3, and the other end can be fixed by means of a suspended ceiling, and it is only necessary to ensure that the tension sensor 6 is arranged in the vertical direction; at the same time, a speed sensor 9 is provided on the double-helix weighing scale 3.

[0023] A feeding port is provided at the upper right end of the double-screw weighing scale 3, and a double-impeller feeder 2 is connected at the discharge port; the motor used to drive the double-impeller feeder 2 is a first variable frequency motor 10, and the double-impeller feeder 2 includes a box body 22 and two impeller assemblies 21, the box body 22 is connected to the double-screw weighing scale 3, and the two impeller assemblies 21 are rotatably connected in the box body 22 and arranged in parallel; the impeller assembly 21 includes a rotating shaft 26 and two spiral blades 25, the rotating shaft 26 is rotatably connected in the box body 22, and the two spiral blades 25 are arranged adjacent to each other along the length direction of the rotating shaft; the spiral directions of the two spiral blades 25 are opposite; a feeding port is provided at the upper end of the double-impeller feeder 2, and a gate valve 1 is provided at the feeding port, and the gate valve 1 is used to control the opening and closing of the feeding port.

[0024] The double-screw metering scale 3 and the double-impeller feeder 2 are connected by a first flexible connection 7, which is a large-section straight-through connection port. A large-section material port straight-through connection is adopted from the gate valve 1 to the spiral scale feeding end without any shrinkage in the middle. The connecting structure avoids the risks of material bulging and blocking as much as possible, and improves the feeding stability under a large range.

[0025] The cross-section of the inlet and outlet of the double impeller feeder 2 is consistent with that of the gate valve 1. Because the cross-section of the inlet is large and the blades are very long, a middle partition 24 is set between the two spiral blades 25, and end partitions 23 are set at both ends to increase the strength of the impeller. Since the spiral directions of the two spiral blades 25 are opposite, adjacent spaces are connected without interruption during material discharge, ensuring the continuity and uniformity of material discharge.

[0026] When adjusting the material dosage, the weighing control system simultaneously sends different control signals to the first variable frequency motor 10 and the second variable frequency motor 11, and realizes the set powder feeding amount by adjusting the rotation speed of the first variable frequency motor 10, and keeps the material filling rate in the metering spiral tube unchanged by adjusting the rotation speed of the second variable frequency motor 11. The speed sensor 9 installed at the end of the double-spiral metering scale 3 collects the number of revolutions of the spiral shaft in real time, which is used to feedback and adjust the driving of the second variable frequency motor 11, eliminates the interference of the grid frequency and voltage fluctuations, and accurately controls the feeding speed of the metering spiral blade 25, thereby ensuring the accuracy of metering when the material is adjusted.

[0027] Finally, in order to expand the conveying distance of the system and improve the weighing accuracy, a screw conveyor 4 is connected to the lower left end of the double-screw weighing scale 3. The screw conveyor 4 and the double-screw weighing scale 3 are connected by a soft connecting tarpaulin 12, so it will not affect the reading of the tension sensor 6.

[0028] The present application adopts a variable frequency motor or a servo motor to drive the double impeller feeder 2 and the double screw metering scale 3, and cooperates with the single impeller + single tube screw metering method to achieve a maximum conveying volume and a minimum conveying volume ratio of more than 1:10; at the same time, a control system is used to synchronously regulate the speed of the double impeller feeder 2 and the double screw metering scale 3, which quickly responds to changes in dosage and keeps the filling rate of the powder in the metering spiral tube basically unchanged, thereby achieving accurate metering.

[0029] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A precise and stable powder feeding system, characterized by: The invention comprises a mounting platform (13) and a double-screw weighing scale (3), wherein a support (8) is provided on the mounting platform (13), a fulcrum is provided on the support (8), and a groove adapted to the fulcrum is provided at the bottom of the double-screw weighing scale (3); the support (8) supports the double-screw weighing scale (3) through the fulcrum; a tension sensor is provided at the top left side of the double-screw weighing scale (3), one end of the tension sensor (6) is connected to the upper side of the double-screw weighing scale (3), and the other end is suspended from the ceiling; a feed inlet is provided at the upper end of the double-screw weighing scale (3), and the feed inlet is connected to a double-impeller feeder (2).

2. A precise and stable powder feeding system according to claim 1, characterized in that: A feeding port is provided at the upper end of the double-impeller feeder (2), and a gate valve (1) is provided at the feeding port.

3. A precise and stable powder feeding system according to claim 1, characterized in that: The double-impeller feeder (2) comprises a housing (22) and two impeller assemblies (21), wherein the housing (22) is connected to the double-screw weighing scale (3); the two impeller assemblies (21) are rotatably connected in the housing (22); the impeller assembly (21) comprises a rotating shaft (26), wherein the rotating shaft (26) is rotatably connected in the housing (22), and the rotating shaft (26) is provided with two groups of spiral blades (25) with opposite spiral directions along its length direction.

4. A precise and stable powder feeding system according to claim 3, characterized in that: A middle partition plate (24) is provided between the two groups of spiral blades, and end surface partition plates (23) are provided at both ends of the two spiral blades.

5. A precise and stable powder feeding system according to claim 1, characterized in that: The double-screw weighing scale (3) is provided with a discharge port on one side close to the tension sensor (6), and the discharge port is connected to a screw conveyor (4) via a soft connecting tarpaulin (12).

6. A precise and stable powder feeding system according to claim 1, characterized in that: A large-section straight-through soft connection is adopted between the double-impeller feeder (2) and the double-screw metering scale (3).

7. A precise and stable powder feeding system according to claim 1, characterized in that: The double-screw weighing scale (3) is provided with a rotation speed sensor (9).

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