Self-descending type powder weight checking device

Abstract

The utility model discloses a self-descending type powder weight checking device which comprises a driving device, a driving shaft, a constant volume device, a connecting support and a fixing seat, the driving device is installed on the upper portion of the fixing seat, the driving shaft is in driving connection with the driving device, and the driving shaft penetrates through the fixing seat and the connecting support to be installed on the lower surface of the fixing seat. The weight checking device is installed on the lower portion of the connecting support, and the constant volume device is installed at the lower end of the weight checking device. The weight checking device is further electrically connected with a control module, and the control module is electrically connected with an external power source. According to the constant volume device, the defects in the prior art are overcome, and a guarantee is provided for further realizing high-efficiency, low-consumption, low-cost, digital, accurate and stable management and control of an electrolytic aluminum production process.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrolytic aluminium production process's raw material alumina continuous feeding technical field, specifically belong to the self descending type powder weight detection device. BACKGROUND

[0002] Modern aluminum industry production, generally adopts cryolite-alumina molten salt electrolysis method, and its main equipment is aluminum electrolysis cell. The flux for electrolytic aluminum includes cryolite (i.e. sodium aluminum fluoride Na3AlF6), sodium fluoride (NaF), aluminum fluoride (AlF3), calcium fluoride (CaF2), magnesium fluoride (MgF2) and the like. The electrolytic aluminum process production adopts the traditional cryolite-alumina molten electrolysis method, and cryolite, aluminum fluoride and other additives and the like are added into the electrolysis cell according to the required ratio, a certain amount of alumina raw material is dissolved in the molten cryolite, direct current is introduced through the carbon anode, and electrochemical reaction occurs to precipitate liquid aluminum on the cathode. In the production process, the alumina raw material is output from the daily storage bin and is conveyed to the alumina storage tank at the upper part of the aluminum electrolysis cell through the super-concentration phase conveying system. Then, the material is fluidized through the fluidized bed in the storage tank, and is fed into the configured discharging execution mechanism "constant-volume feeder" in the storage tank in a self-descending manner. The production raw material alumina is controlled by the electrolysis cell control system to be fed into the tank in a timely, continuous and quantitative manner, so as to meet the needs of continuous and stable production.

[0003] In the existing production technology, the constant-volume feeder is always used for constant-volume feeding of the raw material alumina, and the feeding amount is controlled according to the weight of the constant-volume container. Since the constant-volume feeding will cause a large error in the weight of alumina in each feeding, it is necessary to use the manual dynamic material receiving and weighing method to correct the feeding interval time. Through manual weighing, it is found that the weight error of the alumina with the rated weight is mostly dynamically changed within the range of less than 15%, and a few are dynamically changed within the range of +60%, and there is no regularity. The constant-volume feeding cannot achieve accurate quantitative feeding through weight detection. Due to the lack of alumina weight data in each constant-volume feeding, the adjustment of the technical indexes of the related process operation of the electrolytic aluminum production needs to rely on experience operation and management to a great extent. The technical level and experience of the operation and management personnel will seriously affect the efficient, low-consumption and low-cost stable production of electrolytic aluminum. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a self-descending type powder weight detection device to overcome the shortcomings of the prior art.

[0005] To solve the above problems, the technical scheme adopted by the utility model is as follows:

[0006] The descending powder weight detection device comprises a driving device, a driving shaft, a constant volume device, a connecting support and a fixing base, the driving device is installed on the upper part of the fixing base, the driving shaft is connected with the driving device, and the driving shaft penetrates through the fixing base, the connecting support is installed on the lower surface of the fixing base, the lower part of the connecting support is provided with the weight detection device, and the constant volume device is installed on the lower end of the weight detection device;

[0007] The weight detection device is further electrically connected with a control module, and the control module is electrically connected with an external power supply.

[0008] The driving shaft is drivingly connected with the constant volume device.

[0009] The gas-solid separation cylinder is further installed between the constant volume device and the weight detection device, the lower end of the gas-solid separation cylinder is provided with a feeding channel, and the driving shaft penetrates through the inside of the gas-solid separation cylinder and is drivingly connected with the constant volume device.

[0010] The inside of the fixing base is a hollow structure, and the fixing base is provided with an excess air outlet, the connecting support comprises a top cover and at least four hollow connecting rods installed on the top cover, an exhaust channel is formed in the hollow connecting rod, the lower end of the exhaust channel is communicated with the inside of the gas-solid separation cylinder, the top cover, the weight detection device and the inside of the gas-solid separation cylinder form a gas-solid separation bin, and the exhaust channel is communicated with the gas-solid separation bin.

[0011] Compared with the prior art, the implementation effects of the utility model are as follows:

[0012] 1、The weight detection device can detect the weight data of the alumina powder in the electrolytic aluminum production process in real time, solve the "volume weight" calculation defect of the traditional electrolytic aluminum production process, and cannot effectively detect the weight of the real-time discharge, and provide protection for the further realization of efficient, low consumption, low cost, digital precise and stable control of the electrolytic aluminum production process.

[0013] 2、The weight detection device can reduce the pressure of the gas-solid separation bin and realize the gas-solid separation and stable discharge of the flow state alumina. DETAILED DESCRIPTION

[0014] Figure 1 It is an installation and use structure schematic view of the utility model;

[0015] Figure 2 It is a sectional view of the structure between the fixing base and the gas-solid separation cylinder of the utility model.

[0016] Explanation of reference numerals: 1, fixed seat; 11, excess air outlet; 2, driving device; 22, driving shaft; 3, solid fluidized material box; 31, fluidized bed; 32, air supply port; 33, exhaust port; 34, feeding port; 4, connecting rod; 41, exhaust passage; 42, top cover; 5, weight checking device; 6, gas-solid separation cylinder; 61, feeding passage; 62, gas-solid separation bin; 7, constant volume device; 71, feeding controller; 72, discharging controller. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0018] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0019] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0020] The self-falling feeder used for feeding electrolytic aluminum-alumina raw materials is, for example Figure 1As shown, it includes a drive unit 2 and a drive shaft 22 mounted on the drive unit 2. The drive unit 2 can use a cylinder, which is supplied with air from an external air source. The air supply process from the external air source to the cylinder is controlled by a control module (not shown in the figure). The drive unit 2 is mounted on a fixed base 1. The drive shaft 22 passes through the fixed base 1 and is driven to a volume control device 7 mounted below the fixed base 1. The volume control device 7 includes a cylinder and a feed controller 71 and a discharge controller 72 mounted at both ends of the cylinder. The drive shaft 22 is driven to the feed controller 71 and the discharge controller 72. It should also be noted that the drive unit is equipped with an idle position sensor and a full load position sensor. The idle and full load position sensors send signals to the control module by detecting the position of the drive unit's movement, enabling the control module to control the movement state and process of the drive unit, i.e., to realize the control of the feed controller 71 and the discharge controller 72 by the drive shaft 22.

[0021] like Figure 1 As shown, the drive device 2 is installed on the upper part of the fixed base 1, the drive shaft 22 is driven and connected to the drive device 2, the connecting bracket is installed on the lower surface of the fixed base 1, the lower part of the connecting bracket is equipped with a checkweighing device 5, the checkweighing device 5 can use a tensile stress sensor, the lower end of the checkweighing device 5 is equipped with a gas-solid separation cylinder 6, the lower end of the gas-solid separation cylinder 6 is provided with a feeding channel 61, the lower end of the gas-solid separation cylinder 6 is connected to a volume-regulating device 7, and the drive shaft 22 passes through the connecting bracket, the gas-solid separation cylinder 6 and is driven and connected to the volume-regulating device 7.

[0022] The checkweighing device 5 is electrically connected to the control module, which is electrically connected to an external power supply. The control module includes a data processing unit, which enables the control module to control the operation of the drive device and send the detection data collected by the checkweighing device 5 and the operating status of the drive device to the host computer.

[0023] In addition, the fixed base 1 has a hollow structure inside and is provided with an exhaust air outlet 11. The connecting bracket includes a top cover 42 and four hollow connecting rods 4 installed on the top cover 42. An exhaust channel 41 is formed inside the hollow connecting rods 4. The lower end of the exhaust channel 41 is connected to the inside of the gas-solid separation cylinder 6. The upper end of the checkweighing device 5 is connected to the periphery of the top cover 42. The top cover 42, the checkweighing device 5 and the inside of the gas-solid separation cylinder 6 form a gas-solid separation chamber 62. The exhaust channel 41 is connected to the gas-solid separation chamber 62.

[0024] The solid fluidization tank 3 in the electrolytic aluminum equipment is installed on the upper portion of the aluminum electrolysis cell, the solid fluidization tank 3 is provided with a feeding port 34, an air supply port 32 and an exhaust port 33, the solid fluidization tank 3 is provided with a fluidized bed 31, the air supply port 32 is arranged on the solid fluidization tank 3 below the fluidized bed 31, the feeding port 34 and the exhaust port 33 are arranged on the solid fluidization tank 3 above the fluidized bed 31, a feeder is installed in the solid fluidization tank 3, a gas-solid separation bin 62 is arranged in cooperation with the fluidized bed 31, and the fluidized alumina raw material on the fluidized bed 31 can enter the gas-solid separation bin 62 from the feeding channel 61 after being fluidized.

[0025] The working process of the self-falling powder weight detection device is described in detail as follows:

[0026] When the feeding is needed, the air source of the air supply port 32 of the solid fluidization tank 3 is opened, the solid fluidization tank 3 fluidizes the alumina powder on the fluidized bed 31 from the feeding port 34 through the air supply port 32, the fluidized alumina powder enters the gas-solid separation bin 62 from the feeding channel 61, the back pressure resistance of the alumina powder is released in the gas-solid separation bin 62, the turbulent state is eliminated, the alumina powder is deposited in the gas-solid separation bin 62, and the remaining air in the fluidization process flows out from the exhaust port 33; and the remaining air separated in the gas-solid separation bin 62 enters the fixed seat 1 from the exhaust channel 41 of the connecting rod 4, and is discharged into the external exhaust pipeline from the air outlet 11 of the fixed seat 1.

[0027] When the feeding is needed, the air source of the air supply port 32 of the solid fluidization tank 3 is opened, the solid fluidization tank 3 fluidizes the alumina powder on the fluidized bed 31 from the feeding port 34 through the air supply port 32, the fluidized alumina powder enters the gas-solid separation bin 62 from the feeding channel 61, the back pressure resistance of the alumina powder is released in the gas-solid separation bin 62, the turbulent state is eliminated, the alumina powder is deposited in the gas-solid separation bin 62, and the remaining air in the fluidization process flows out from the exhaust port 33; and the remaining air separated in the gas-solid separation bin 62 enters the fixed seat 1 from the exhaust channel 41 of the connecting rod 4, and is discharged into the external exhaust pipeline from the air outlet 11 of the fixed seat 1.

[0028] When the alumina powder needs to be fed into the electrolytic tank, the control module controls the air source of the driving device 2 to drive the driving shaft 22 to drive the discharging controller 72 to open, while the feeding controller 71 remains closed, the alumina powder in the cylinder flows into the electrolytic tank below, when the feeding is completed (i.e. the driving device runs to the no-load position sensor), the control module controls the air source of the driving device 2 to reset the driving shaft 22, the discharging controller 72 is closed, at this time the weight device 5 and the control module obtain a stable weight value of the no-load cylinder, then the value is sent to the upper computer (enterprise data management platform) by the control module; the feeding of the alumina powder is realized through the above-mentioned cycle. The maximum error of the self-descending powder weight device is ≤±5%.

[0029] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A self-descent powder weighing device, comprising a drive unit (2), a drive shaft (22), a volume-regulating device (7), a connecting bracket, and a fixed base (1), characterized in that: The drive device (2) is installed on the upper part of the fixed base (1), the drive shaft (22) is connected to the drive device (2), and the drive shaft (22) passes through the fixed base (1). The connecting bracket is installed on the lower surface of the fixed base (1), the lower part of the connecting bracket is equipped with a checkweighing device (5), and the volume-fixing device (7) is installed at the lower end of the checkweighing device (5). The checkweighing device (5) is also electrically connected to a control module, which is electrically connected to an external power supply. The drive shaft (22) is driven to connect with the volume-regulating device (7).

2. The self-descending powder weighing device according to claim 1, characterized in that: A gas-solid separator (6) is also installed between the volume-regulating device (7) and the checkweighing device (5). The lower end of the gas-solid separator (6) is provided with a feeding channel (61). The drive shaft (22) passes through the inside of the gas-solid separator (6) and is driven to connect with the volume-regulating device (7).

3. The self-descending powder weighing device according to claim 2, characterized in that: The fixed base (1) has a hollow structure inside and is provided with an exhaust outlet (11). The connecting bracket includes a top cover (42) and at least four hollow connecting rods (4) installed on the top cover (42). An exhaust channel (41) is formed inside the hollow connecting rods (4). The lower end of the exhaust channel (41) is connected to the interior of the gas-solid separation cylinder (6). A gas-solid separation chamber (62) is formed inside the top cover (42), the checkweighing device (5), and the gas-solid separation cylinder (6). The exhaust channel (41) is connected to the gas-solid separation chamber (62).

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