CN101936539A

CN101936539A - Tensile powder feeder

Info

Publication number: CN101936539A
Application number: CN 201010298185
Authority: CN
Inventors: 孙家鼎
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-09-30
Filing date: 2010-09-30
Publication date: 2011-01-05

Abstract

The invention discloses a tensile powder feeder, which consists of two parts, namely a powder feeding device and a powder measuring device. Powder of a powder conveying system falls onto a powder feeding plate of the tensile powder feeder from a powder feeding hopper according to the gravity of the powder; in order to adapt to the change of convey load, the stepping angle of the rotation of a stepping motor is adjusted to adapt to the change; the powder feeding plate is driven to rotate the same rotation angle to control a passageway cross section of the powder so that the controlled powder enters the powder measuring device; the opening angle of the powder feeding plate is adjusted to control the powder feeding amount of the powder feeding hopper; when the measured powder falls onto a powder measuring plate from the powder feeding plate, the powder feeding plate generates a positive torque under the action of the gravity of the powder; a powder measuring rotation shaft generates a negative torque under the action of the tensile force of an extension spring at the same time to keep dynamic balance with the positive torque; a tension sensor measures the tensile force of the deformation of the spring and can output 4 to 20mA standard analog current magnitude to a computer in real time; and the real-time instantaneous flow rate of the powder is measured, wherein approved by National Institute of Metrology of PRC(NIM), the measuring precision is of 0.5 level.

Description

The tensile force type machine supplying powder

Technical field

The present invention relates to a kind of tensile force type machine supplying powder of accurate measurement powder flow.

Background technology

The coal-burning power plant monitors that the technology of boiler coal-ash feed status and accurate measurement flow thereof is very important, and it can influence the safety and economy operation of boiler.Up to now, the coal dust preparation system that many coal-burning power plants and steel plant are arranged is storage formula or half a direct-firing coal dust preparation system in adopting, continued to use the feed status that for many years Impeller powder feeder can not monitor coal dust, can not accurately measure powder-feeding amount, but also many consumed powers, existing problems in service are more, the real production equipment that falls behind that belongs to should firmly be eliminated, and the tensile force type machine supplying powder can monitor the feed status of coal dust, also can accurately measure powder-feeding amount, can also save electric energy, guarantee the safety and economy operation of boiler milling system effectively, " energy-saving and emission-reduction " effect highly significant.

Summary of the invention

The objective of the invention is: by accurate measurement, make powder delivery system can be in operation under the safety and economy state, " energy-saving and emission-reduction " are had great significance the real-time gravity flow of powder delivery system.The tensile force type machine supplying powder is formed by surveying powder harvester and computer software.For the coal-burning power plant, powder under the running status is coal dust or flyash, all has good flow behavior, the powder in powder storehouse in the powder delivery system, fall into giving on the powder plate (3) of tensile force type machine supplying powder according to its powder gravity warp to powder bucket (1), under the driving of planetary reducer (6) and stepper motor (7), for adapting to the variation of carrying load, the step angle of regulating the stepper motor rotation adapts with it, drive and rotate identical step angle for the powder plate, drive the angle of opening for the powder plate and control the cross section of fluid channel of powder, controlled powder is entered survey the powder device, entering the powder amount of surveying the powder device is the pulse signal that produces by change PLC, and the angle that adjusting opens for the powder plate is controlled the powder-feeding amount to the powder bucket.Survey under the powdery attitude initial, the step angle that stepper motor is set is zero, give the powder plate and survey powder plate (14) and all be in the equalising torque closed condition, surveying the powder flow this moment is zero, when tested powder is surveyed the powder plate by falling for the powder plate, surveying the powder plate falls under the powder gravity effect of surveying on the powder plate at it, make survey powder rotating shaft (15) lose original balance and produce forward torque, rotating shaft is rotated, extension spring (25) distortion that is stretched, survey the powder rotating shaft under the effect of extension spring pulling force, produce opposing torque and forward torque and keep dynamic equilibrium, pulling force sensor (26) with the extension spring polyphone, can record the tensile force of camber of spring, and can export the 4-20mA standard analog magnitude of current in real time and give computer, the pulling force that computer software records according to pulling force sensor, measure the real-time instantaneous delivery of powder, assert through China National Measuring Science Research Inst., its certainty of measurement is 0.5 grade, computer also demonstrates angle and the traffic trends figure that opens to the powder plate, offer the operations staff, as the important evidence of adjusting boiler safety and economical operation.

Description of drawings

Shown Fig. 1 is the front view of tensile powder feeder; Fig. 2 is its top view, tensile powder feeder is by to the powder device with survey two parts of powder device and consist of: taper is provided with to powder plate (3) to lower mouthful of powder bucket (1) and is connected with screw with stage casing to powder rotating shaft (2), pass respectively to powder casing (4) by supporting for powder bearing block assembly (5) for the two ends of powder rotating shaft, be connected 7 with planetary reducer (6) with stepper motor for an end of powder rotating shaft) coaxial concentric the connection, end with the gas balance pipe (9) of draft gauge (8) is connected with giving the powder casing, the other end is connected with survey powder casing (10), survey the powder device and be provided with the maximum powder sinking tube (13) of surveying powder powder amount of prepackage by the end face that the band circumference saves the survey powder casing of (11), its lower port arranges surveys powder plate (14), surveying the powder plate is connected with survey powder rotating shaft (15), survey the powder rotating shaft and pass survey powder cabinet exterior, surveying the two ends of powder rotating shaft is supported by the survey powder bearing block assembly (16) of surveying the outer sidewall connection of powder casing respectively, survey an end of powder rotating shaft by being with the leading screw (18) of adjusting stone roller (17) to interconnect with runner piece (23), the outer rim of runner piece is twined seizing wire (24), the extension spring (25) of contacting under it, and pulling force sensor (26), the lead-out wire of pulling force sensor (27) is connected with the computer data acquiring mouth, can carry the 4-20mA standard analog magnitude of current to computer, these assembling parts be placed in the dustproof case (28) of sealing together.

The specific embodiment

In the Figure of description: the tensile force type machine supplying powder is the gravity flow of accurate measurement coal dust in real time, the tensile force type machine supplying powder is by constituting with survey powder device two parts to the powder device: give powder plate (3) and be connected for powder rotating shaft (2) what be provided with to powder bucket (1) end opening, planetary reducer of coaxial connection (6) and stepper motor (7) can drive synchronous rotation orientation angle arbitrarily with it, regulate the aperture of giving the powder plate and quantitatively give powder to surveying the powder device, satisfy the needs of carrying the powder load, survey powder plate (14) and giving survey powder rotating shaft generation forward torque under the effect of grain weight power, the opposing torque institute balance that the deformation force of spring (25) of can being stretched produces, can record the deformation force of extension spring with the pulling force sensor (26) that extension spring is contacted mutually, lead-out wire (27) by pulling force sensor can be exported the corresponding 4-20mA standard analog magnitude of current to computer, thereby records the gravity flow of the real-time accurate measurement powder of tensile force type machine supplying powder, survey angle and instantaneous gravity flow tendency chart that the powder plate is opened.

Claims

1. tensile force type machine supplying powder, it is characterized in that: taper is provided with to powder plate (3) to the end opening of powder bucket (1) and is connected with screw with the stage casing of giving powder rotating shaft (2), pass to powder casing (4) by supporting for powder bearing block assembly (5) for the two ends of powder rotating shaft respectively, give an end and planetary reducer (6) and coaxial concentric connection of stepper motor (7) of powder rotating shaft, an end that has the gas balance pipe (9) of draft gauge (8) is connected with giving the powder casing, the other end is connected with survey powder casing (10), survey the powder device and be provided with the maximum powder sinking tube (13) of surveying the powder amount of prepackage by the end face that the band circumference saves the survey powder casing of (11), its lower port is provided with surveys powder plate (14), surveying the powder plate is connected with survey powder rotating shaft (15), survey the powder rotating shaft and pass survey powder cabinet exterior, the two ends of surveying the powder rotating shaft are respectively by surveying survey powder bearing block assembly (16) support that powder casing lateral wall connects, an end of surveying the powder rotating shaft is by being with the leading screw (18) of adjusting stone roller (17) to interconnect with runner piece (23), runner piece outer rim is twined seizing wire (24), the extension spring (25) of contacting under it, and pulling force sensor (26), the lead-out wire of pulling force sensor (27) is connected with the computer data acquiring mouth, can carry the 4-20mA standard analog magnitude of current to computer, these parts are fitted together place in the dustproof case (28) that sealing can lock.