CN110817480A - Accurate feeding device suitable for long period operation test - Google Patents
Accurate feeding device suitable for long period operation test Download PDFInfo
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- CN110817480A CN110817480A CN201910913890.8A CN201910913890A CN110817480A CN 110817480 A CN110817480 A CN 110817480A CN 201910913890 A CN201910913890 A CN 201910913890A CN 110817480 A CN110817480 A CN 110817480A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G65/00—Loading or unloading
- B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
- B65G65/34—Emptying devices
- B65G65/40—Devices for emptying otherwise than from the top
- B65G65/46—Devices for emptying otherwise than from the top using screw conveyors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G65/00—Loading or unloading
- B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
- B65G65/34—Emptying devices
- B65G65/40—Devices for emptying otherwise than from the top
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G65/00—Loading or unloading
- B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
- B65G65/34—Emptying devices
- B65G65/40—Devices for emptying otherwise than from the top
- B65G65/44—Devices for emptying otherwise than from the top using reciprocating conveyors, e.g. jigging conveyors
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- Mechanical Engineering (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
Abstract
The invention discloses an accurate feeding device suitable for a long-period operation test, which comprises a two-stage bin, a driving motor, a material supplementing rotary table, a spiral spring, a PID (proportion integration differentiation) controller and the like, wherein the capacity of the one-stage bin is larger, large-capacity powder storage can be realized, and powder is continuously transferred to the two-stage bin under the driving of the material supplementing motor and the rotary table. The second-level storage bin is provided with a pressure sensor which can monitor the height of the material and feed the material back to the feed supplementing motor through a controller so as to ensure that the material level of the second-level storage bin is constant. The powder in the second-level storage bin enters the feeding pipe through the stepping motor and the spiral spring, and is carried into the testing device by fluidized air. The upper part of the fluidization air pipe is provided with a differential pressure sensor, differential pressure signals are fed back to the stepping motor through the controller, and accurate feeding is realized by maintaining the stability of the differential pressure signals. The invention can meet the powder feeding requirement of long-period operation test, and can realize accurate material supply by monitoring and adjusting the feeding amount in real time through differential pressure signals through two-stage feedback control and adjustment.
Description
Technical Field
The invention relates to an accurate feeding device suitable for a long-period operation test, which can realize continuous and accurate supply of materials and is applied to combustion and material conveying of solid fuels such as powder, biomass and the like.
Background
When solid powder such as large powder, biomass and the like is combusted in a laboratory, the powder needs to be carried into a combustion experimental device through gas for powder combustion, the particle size of the powder in a powder combustion test is generally small and generally lower than 100 mu m, and continuous and stable supply is needed, so that how to realize continuous and accurate feeding is very important for smooth operation of the whole test.
The existing laboratory feeding device mainly comprises a propelling type, a screw rod type, a fluidization type and the like, the propelling type micro-feeder provided by Chinese patent 201611161662.2 can realize stable powder feeding at a low powder feeding rate by feeding powder into the laboratory device through a push rod, but the volume of a material bin of the patent is small, and long-time continuous feeding cannot be realized, so that the propelling type micro-feeder is not suitable for a laboratory testing device which runs continuously for a long period, and the propelling type micro-feeder can extrude the powder, so that powder feeding blockage is easily caused. Although the powder feeding device provided by the chinese patent 201110134050.5 does not cause powder extrusion, the device cannot realize feeding when the particle size of the powder is large, and the device has a closed material bin, and cannot realize long-time continuous feeding. Screw feeder uses most in the laboratory, and screw feeder passes through the motor and rotates the drive screw rod rotatory, and is terminal with material propelling movement to the screw rod through the thread clearance, but this kind of device takes place the powder easily and ties shortcomings such as hunch, unloading unstability, and the homogeneity of feed has very big relation with the feed bin material level moreover.
When a self-sustaining combustion experiment of powder is carried out in a laboratory, the powder is often required to be continuously supplied in a long period, the powder cannot be stopped in the middle of the experiment, so that a great requirement is provided for the long-period operation characteristic of a powder feeding device, in the prior art, powder feeders are connected in parallel to realize long-period powder feeding, but the high requirement is provided for the working states of different powder feeders, the experiment cost can be greatly improved, meanwhile, the feeding accuracy of the conventional powder feeder can only be calibrated before the experiment, and the powder feeding stability cannot be monitored in the operation process, so that the operation stability of the powder feeder cannot be judged.
Disclosure of Invention
Aiming at the problem that the powder feeder in the prior art cannot feed accurately, the invention provides an accurate feeding device suitable for a long-period operation test. The device can satisfy the experimental feed demand of long period operation, can carry out real-time supervision and regulation to the stability of feed moreover at the feed in-process, realizes continuous accurate feed.
The invention is realized by adopting the following technical scheme:
an accurate feeding device suitable for a long-period operation test comprises a primary storage bin, a secondary storage bin, a feeding PID controller, a pressure sensor, a feeding pipe, a differential pressure sensor and a feeding PID controller; wherein the content of the first and second substances,
the first-stage storage bin and the second-stage storage bin are connected through a flange, a material supplementing rotating mechanism is arranged in the middle of the first-stage storage bin and used for transferring powder from the first-stage storage bin to the second-stage storage bin, a pressure sensor is arranged in the middle of the second-stage storage bin and used for outputting a material level signal to enter a material supplementing PID controller for deviation adjustment, and the material supplementing PID controller outputs a rotating speed signal to adjust the material transfer speed from the first-stage storage bin to the second-stage storage bin; the secondary storage bin is connected with a feeding pipe through a feeding rotating mechanism, one end of the feeding pipe is fluidized air, and the other end of the feeding pipe is a feeding machine outlet; the pressure difference sensor is arranged on the upper part of the feeding pipe, the pressure difference signal is output to enter the PID controller for deviation adjustment, and the PID controller outputs a rotating speed signal to adjust the feeding speed of the feeding rotating mechanism.
The invention has the further improvement that the material supplementing mechanism comprises a material supplementing motor and a material supplementing turntable which are arranged between the first-level bin and the second-level bin, and the material supplementing turntable is of an interval hollow structure; the material supplementing motor is used for driving the material supplementing rotary disc to rotate, the rotating speed of the material supplementing motor is controlled through the rotating speed signal output by the material supplementing PID controller, and the material quantity entering the secondary storage bin is adjusted to maintain the material level to be constant.
The invention is further improved in that the feeding rotating mechanism comprises a spiral spring arranged in a pipeline between the secondary storage bin and the feeding pipe and a feeding stepping motor which is positioned outside the pipeline and used for driving the spiral spring to rotate, the rotating speed of the feeding stepping motor is controlled by outputting a rotating speed signal through a feeding PID controller, and the feeding amount is further adjusted to maintain the constant pressure difference between measuring points in the feeding pipe.
The invention is further improved in that a plurality of sound wave vibrators are arranged on the outer wall of the secondary bin to prevent powder from being compacted in the powder bin.
The invention has the further improvement that a necking is arranged at the interface of the feeding pipe and the feeding rotating device, so that the wind speed is improved to enhance the carrying capacity of wind on powder.
The invention has the further improvement that the side wall of the primary storage bin is provided with a visual window so as to conveniently monitor the material quantity in the storage bin.
The invention is further improved in that one end of the feeding pipe close to the fluidizing air is also provided with an air distribution plate.
The invention is further improved in that a plurality of channels are arranged on the feed supplementing rotary disc along the circumferential direction, when the channels rotate to the first-stage storage bin, materials enter the channels, and when the channels filled with the materials rotate to the second-stage storage bin, the materials enter the second-stage storage bin under the action of gravity.
The invention has the following beneficial technical effects:
the invention provides an accurate feeding device suitable for a long-period operation test. The powder is accumulated in a large-scale first-level bin, the powder is transferred from the first-level bin to a second-level bin under the action of a material supplementing motor and a material supplementing turntable, the powder in the second-level bin enters a powder feeding pipe under the action of a rotating mechanism consisting of a stepping motor and a spiral spring, fluidized air in the powder feeding pipe is carried into a testing device, and the powder feeding speed is controlled by the rotating speed of the stepping motor. The first-level bin and the second-level bin are both provided with sound wave vibrators to prevent powder from being accumulated in the powder bin and being compacted under the action of gravity to cause powder arching. The interface of the feeding pipe and the feeder is designed to be a necking structure, so that the fluidization wind speed can be effectively improved, and the powder carrying capacity of the fluidization wind is improved.
The feed supplementing motor and the stepping motor are both controlled by a feedback control system. To the feed supplement motor, this mechanism mainly used shifts the powder to the second grade feed bin from the one-level feed bin, its rotational speed receives the control of the material level height of second grade feed bin, pressure sensor is arranged at second grade feed bin middle part, the material level height of detectable material, be arranged in the deviation regulation in the PID controller of output material level signal entering, when second grade feed bin material level height is lower, feed supplement PID control system can produce signal control feed supplement motor and improve the rotational speed, make the material transfer rate of one-level feed bin to second grade feed bin increase, the material level height of material resumes the limit value until, this material level height of mainly considering the second grade feed bin will produce great influence to final powder feeding stability. For a feeding stepping motor, the mechanism is mainly used for transferring powder from a secondary storage bin to a feeding pipe, then the powder is carried into a test device by fluidized air, and the rotating speed of the mechanism is mainly controlled by a pressure difference signal of the feeding pipe. In the feeding pipe, the pressure loss between two fixed points is mainly related to the material quantity and the resistance loss of an air pipe, for the feeding pipe which runs stably, the flow of fluidized air is in a stable state, and the pressure loss is also in a stable state, so that the pressure difference between the two points is mainly influenced by the material quantity, when a pressure difference signal is reduced, a feeding PID controller can generate a signal to control a feeding stepping motor to increase the rotating speed, the material quantity entering a powder feeding pipe is increased, and the pressure difference signal is restored to a set value to ensure the stability of powder feeding.
Furthermore, a plurality of sound wave vibrators are arranged on the outer wall of the second-level storage bin to prevent powder from being compacted in the powder bin, and meanwhile, the sound wave vibrators can also improve the flowability of the powder.
Furthermore, a necking is formed at the interface of the feeding pipe and the feeding rotating device, so that the wind speed is improved to enhance the carrying capacity of wind to powder.
Further, one-level feed bin lateral wall is provided with visual window to conveniently monitor the material volume in the feed bin.
Furthermore, an air distribution plate is arranged at one end, close to the fluidized air, in the feeding pipe, and the air distribution plate can enable the fluidized air to be more uniform, so that the stability of carrying materials is improved; certain resistance is added to the airflow, the stability of the fluidized bed layer is maintained, and the instability of the fluidized bed layer is inhibited.
Further, a plurality of passageways have been arranged along circumference to the feed supplement carousel, and when the passageway was rotatory to the one-level feed bin, the material got into the passageway, and when the passageway that fills with the material was rotatory to the second grade feed bin, the material got into the second grade feed bin under the action of gravity. The device passageway is discontinuous setting, can avoid the material to get into the second grade feed bin by the one-level feed bin when the feed supplement motor is out of work, has the function of valve.
In summary, the invention adopts a mode of combining two-stage material bins and two-stage feedback control, can realize continuous and stable material supply, and has the following advantages compared with the prior feeder:
1. the one-level storage bin has large capacity, can realize long-period uninterrupted continuous feeding, and can not influence the feeding stability by filling materials into the powder bin in the test process.
2. The first-stage storage bin and the second-stage storage bin are connected through the feed supplementing motor and the rotary disc, so that sealing of the second-stage storage bin can be achieved, and pressure-bearing operation can be achieved.
3. Adopt two-stage feedback control to adjust, can effectively improve the inaccurate problem of screw feeder blanking, also can carry out real-time supervision to the stability of feed in-process, in time carry out feedback control to the feed rate.
4. The adoption of the acoustic vibrator can effectively avoid the compaction and arching of the powder in the storage bin.
5. The visual window is adopted for setting, so that the material storage amount of the first-level storage bin can be fed back in time, and the timely feeding operation is convenient.
6. The stepping motor is adopted for driving, the rotating speed is stable, and the stepping motor can stably run at a low rotating speed.
Drawings
Fig. 1 is a schematic structural diagram of a precise feeding device suitable for long-period operation tests.
Fig. 2 is a sectional view taken along line a-a in fig. 1.
Description of reference numerals:
1 is a first-level stock bin; 2 is a feeding stepping motor; 3 is a secondary stock bin; 4 is a sound wave vibrator; 5 is a feed PID controller; 6 is a feed supplement motor; 7 is a feed supplement turntable; 8 is a pressure sensor; 9 is a helical spring; 10 is a feeding pipe; 11 is a differential pressure sensor; 12 is a feed PID controller; 13 is a wind distribution plate, 14 is a ball valve, and 15 is a visual window.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the accurate feeding device suitable for the long-period operation test provided by the invention comprises a primary bin 1, a feeding stepping motor 2, a secondary bin 3, a sound wave vibrator 4, a feeding PID controller 5, a feeding motor 6, a feeding rotary disc 7, a pressure sensor 8, a spiral spring 9, a feeding pipe 10, a differential pressure sensor 11, a feeding PID controller 12, an air distribution plate 13, a ball valve 14 and a visualization window 15.
The powder is piled up in the great one-level feed bin 1 of capacity, and visual window 15 has been arranged to one-level feed bin 1, can feed back the material height to in time supply the material. Then the powder is transferred from the first-level bin 1 to the second-level bin 3 under the action of a material supplementing motor 6 and a material supplementing turntable 7, the powder in the second-level bin 3 enters a powder feeding pipe under the action of a rotating mechanism consisting of a stepping motor and a spiral spring 9, fluidized air in the powder feeding pipe is carried into a testing device, and the powder feeding speed is controlled by the rotating speed of the stepping motor. The first-level bin 1 and the second-level bin 3 are both provided with sound wave vibrators 4 to prevent powder from being accumulated in the powder bin and being compacted under the action of gravity to cause arching. The interface of the feeding pipe 10 and the feeder is designed to be a necking structure, so that the fluidization wind speed can be effectively improved, and the powder carrying capacity of fluidization wind can be improved.
The feed supplement motor 6 and the stepping motor are both controlled by a feedback control system. To feed supplement motor 6, this mechanism mainly used shifts the powder to second grade feed bin 3 from one-level feed bin 1, its rotational speed receives the control of the material level height of second grade feed bin 3, pressure sensor 8 is arranged at 3 middle parts of second grade feed bin, the material level height of detectable material, be arranged in outputting the material level signal and carry out the deviation control in getting into the PID controller, when 3 material level heights of second grade feed bin are lower, feed supplement PID control system can produce signal control feed supplement motor 6 and improve the rotational speed, make the material transfer rate of one-level feed bin 1 to second grade feed bin 3 increase, the material level height of material resumes the limit value until, this mainly considers second grade feed bin 3's material level height will produce great influence to final powder feeding stability. For the feeding stepping motor 2, the mechanism is mainly used for transferring powder from the secondary storage bin 3 to the feeding pipe 10 and then carrying the powder into the test device by fluidized air, and the rotating speed of the mechanism is mainly controlled by a pressure difference signal of the feeding pipe 10. In the feeding pipe 10, the pressure loss between two fixed points is mainly related to the material quantity and the resistance loss of an air pipe, for the feeding pipe 10 which runs stably, the flow of fluidized air is in a stable state, the pressure loss is also in a stable state, therefore, the pressure difference between the two points is mainly influenced by the material quantity, when the pressure difference signal is reduced, the feeding PID controller 12 can generate a signal to control the feeding stepping motor 2 to increase the rotating speed, the material quantity entering the powder feeding pipe is improved, and the pressure difference signal is recovered to a set value to ensure the stability of the powder feeding.
As shown in figure 2, a plurality of channels are arranged along the circumferential direction of the feed supplementing rotary disc 7, when the channels rotate to the first-stage storage bin 1, materials enter the channels, when the channels filled with the materials rotate to the second-stage storage bin 3, the materials enter the second-stage storage bin 3 under the action of gravity. The device passageway is discontinuous setting, can avoid the material to get into second grade feed bin 3 from one-level feed bin 1 when feed supplement motor 6 is out of work, has the function of valve.
Preferably, an air distribution plate 13 is further arranged at one end, close to the fluidized air, in the feeding pipe 10, and the air distribution plate can enable the fluidized air to be more uniform, so that the stability of carrying materials is improved; certain resistance is added to the airflow, the stability of the fluidized bed layer is maintained, and the instability of the fluidized bed layer is inhibited. A ball valve 14 is arranged at the inlet of the secondary storage bin 3.
Taking coal powder as an example, the following specific working process of the invention is explained as follows:
before starting the device, all parts of the device are ensured to be connected stably. Before experimental powder feeding, the device needs to be calibrated, corresponding pressure difference signal values at different powder feeding rates are recorded, three times of measurement are carried out repeatedly, if the error is less than 2%, the calibration is successful, the system needs to be purged before and after the calibration, so that the influence of residual materials on an experimental calibration result is avoided, and the motor is adjusted to a closed state after the calibration is completed. The pulverized coal is added into the first-stage storage bin 1, and the storage bin is sealed to avoid the influence of the pulverized coal water absorption on feeding. When powder is fed, the material feeding motor 6 and the material feeding feedback system are firstly opened, the material feeding is carried out from the first-stage material bin 1 to the second-stage material bin 3, the regulator adopts PID regulation, the accuracy and the quick regulation are both considered, the fluctuation in the regulation process is reduced, the powder feeding stepping motor and the powder feeding feedback system are opened after the material feeding of the second-stage material bin 3 is completed, the vibration motor is started and the fluidizing air is opened, the set value in the powder feeding PID controller is changed into the required powder feeding quantity value, and the continuous and stable powder feeding can be started. When the material level in the secondary bin 3 deviates from the target value, the feeding PID controller 5 receives the deviation signal to control the rotating speed of the feeding motor 6 and adjust the material level to a set value. When the feeding amount changes in the powder feeding process, the pressure difference signal in the powder feeding pipe changes, and the powder feeding PID controller controls the rotating speed of the stepping motor to adjust the feeding amount to a set value so as to realize accurate feeding. In the powder feeding process, the fluidizing air speed and the air pressure are kept relatively constant, the change of the rotating speed of the stepping motor is also paid attention to, the stepping motor is turned off when the rotating speed of the stepping motor exceeds a certain limit value, the material quantity of the first-level storage bin 1 is also paid attention to, and the material quantity of the first-level storage bin 1 can be timely supplemented when the material quantity is lower. After the experiment is finished, the feeding motor 6 is firstly closed, the transfer of the pulverized coal from the first-stage storage bin 1 to the second-stage storage bin 3 is stopped, then the powder feeding stepping motor is closed after the material quantity of the second-stage storage bin 3 is emptied, and the powder feeding work is finished.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The accurate feeding device suitable for the long-period operation test is characterized by comprising a primary bin (1), a secondary bin (3), a feed PID controller (5), a pressure sensor (8), a feeding pipe (10), a differential pressure sensor (11) and a feed PID controller (12); wherein the content of the first and second substances,
the first-stage storage bin (1) is connected with the second-stage storage bin (3) through a flange, a material supplementing rotating mechanism is arranged in the middle of the first-stage storage bin (1) and used for transferring powder to the second-stage storage bin (3), a pressure sensor (8) is arranged in the middle of the second-stage storage bin (3) and used for outputting a material level signal to enter a material supplementing PID controller (5) for deviation adjustment, and the material supplementing PID controller (5) outputs a rotating speed signal to adjust the material transfer speed from the first-stage storage bin (1) to the second-stage storage bin (3); the secondary storage bin (3) is connected with a feeding pipe (10) through a feeding rotating mechanism, one end of the feeding pipe (10) is fluidized air, and the other end of the feeding pipe is a feeding machine outlet; the differential pressure sensor (11) is arranged at the upper part of the feeding pipe (10), outputs a differential pressure signal to enter the PID controller for deviation adjustment, and the PID controller outputs a rotating speed signal to adjust the feeding speed of the feeding rotating mechanism.
2. The accurate feeding device suitable for the long-period operation test is characterized in that the feeding mechanism comprises a feeding motor (6) and a feeding turntable (7) which are arranged between the primary bin (1) and the secondary bin (3), and the feeding turntable (7) is of an interval hollow structure; the feeding motor (6) is used for driving the feeding turntable (7) to rotate, and the feeding PID controller (5) outputs a rotating speed signal to control the rotating speed of the feeding motor (6), so that the amount of materials entering the secondary storage bin (3) is adjusted to maintain the constant material level.
3. The accurate feeding device suitable for the long-period operation test is characterized in that the feeding rotating mechanism comprises a spiral spring (9) arranged in a pipeline between the secondary storage bin (3) and the feeding pipe (10) and a feeding stepping motor (2) which is arranged outside the pipeline and used for driving the spiral spring (9) to rotate, the rotating speed of the feeding stepping motor (2) is controlled through a feeding PID controller (12) to output a rotating speed signal, and then the feeding amount is adjusted to maintain the constant pressure difference between measuring points in the feeding pipe (10).
4. The accurate feeding device suitable for the long-period running test is characterized in that a plurality of acoustic vibrators (4) are arranged on the outer wall of the secondary bin (3) to avoid the powder from being compacted in the powder bin.
5. The accurate feeding device suitable for the long-period operation test is characterized in that a necking is arranged at the interface of the feeding pipe (10) and the feeding rotating device, and the wind speed is increased to enhance the carrying capacity of wind to powder.
6. The accurate feeding device suitable for the long-period operation test is characterized in that a visual window (15) is arranged on the side wall of the primary storage bin (1) to facilitate monitoring of the material amount in the storage bin.
7. A precision feeding device suitable for long-period running tests according to claim 1, characterized in that an air distribution plate (13) is arranged at the end of the feeding pipe (10) close to the fluidizing air.
8. The accurate feeding device suitable for the long-period operation test is characterized in that the feeding turntable (7) is provided with a plurality of channels along the circumferential direction, when the channels rotate to the first-stage storage bin (1), the materials enter the channels, when the channels filled with the materials rotate to the second-stage storage bin (3), the materials enter the second-stage storage bin (3) under the action of gravity.
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| CN111765950A (en) * | 2020-06-18 | 2020-10-13 | 上海空间电源研究所 | Automatic weighing mechanism for thermal battery isolation powder |
| CN112224892A (en) * | 2020-10-14 | 2021-01-15 | 中国石油化工股份有限公司 | Accurate feed arrangement of low concentration solid particle |
| CN112829974A (en) * | 2021-02-19 | 2021-05-25 | 河北欧卡自动化设备有限公司 | Automatic weighing and subpackaging equipment and weighing and subpackaging method thereof |
| CN116585925A (en) * | 2023-07-17 | 2023-08-15 | 广东工业大学 | Multi-shaft kneader |
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| CN112224892A (en) * | 2020-10-14 | 2021-01-15 | 中国石油化工股份有限公司 | Accurate feed arrangement of low concentration solid particle |
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