CN216321169U - Stepless regulation screw type dust generator - Google Patents

Abstract

The utility model belongs to the technical field of dust generation, and particularly provides a stepless adjusting screw type dust generator. The stepless regulation screw type dust generator mainly comprises a triangular stirring rod, a dust container, a spiral conveying rod and a turning dust conveying device. The frequency-adjustable micro motor drives a triangular stirring rod in the dust container to uniformly feed dust to structures such as a spiral conveying rod, the spiral conveying rod conveys the dust to a turning dust conveying device at different speeds under the stepless adjustment of a side motor, and finally the dust is discharged to the environment through a transverse dust conveying device or a longitudinal dust conveying device. The device can store a certain amount of dust samples, the dust is stirred and discharged through the triangular stirring rod, the discharging process is uniform, the dust is not easy to agglomerate and block, and meanwhile, the dust uniformly falls into the structure of the spiral conveying rod under the action of gravity. After the fixed impeller in the turning dust conveying device is dispersed again, the dust is uniformly and stably generated by means of the wind power of the electric fan, and fine particles are generated, the dust generation amount is stepless and adjustable, and the dispersibility is good.

Description

A stepless adjustment screw type dust generator

technical field

The invention belongs to the technical field of dust generation, and specifically provides a stepless adjustment screw type dust generator.

Background technique

The dust generator is an indispensable device in testing the dust removal effect of the dust removal device. It can disperse the required sample into the air to form a uniform dust-laden airflow, simulating various industrial dust-laden gases. The dust generators currently used mainly include disc suction blowing and spiral rapping.

Due to the different diameters of several concentric arc grooves, the dust holding capacity of each groove is different in the disk suction and blowing type dust generator published by Chinese patent CN2671672C. It is also possible to control the amount of dust generated by adjusting the depth of the scraper into the groove or changing the speed of the motor to produce a constant concentration of dust, but the suction duct has a certain length. Excessive amount of dust inhaled by the duct will lead to blockage of the suction duct, and too little inhalation will have a great influence on the adhesion of the inner wall of the duct, resulting in suction errors; Chinese patent CN211724004U discloses a spiral rapping type dust generator with complex structure, due to the vortex rod The dust feeding is slow, and the dust accumulates above the feeding port, which is prone to blockage, and the vibration noise is large. For fine dust, since it is easy to block the feeding port, the dust generation is mostly uneven. The device is more complicated to use. "The staff can replace the worm with different parameters such as pitch and pressure angle according to the size of the dust material". In addition, by adding Vibration mechanism to avoid dust material hardening and sticking, and then adding shock-proof rubber pads on the base, the structure is redundant, but dust hardening cannot be effectively avoided. In a vibrating spiral dust generator disclosed in Chinese patent CN203737132U, the discharge port is also easy to be blocked by bulking materials, and an electromagnetic warehouse wall vibrator is also used to avoid powder agglomeration, prevent material "blocking", "tower arch" ” phenomenon, but for the powder with fine particles, especially the powder located in the middle of the hopper, the phenomenon of caking and clogging cannot be effectively avoided, so the powder may not be uniformly and continuously sent to the screw conveying shaft, which may lead to The dust concentration is uneven. Therefore, a dust generator with stable dust generation, small size, simple structure, low price, controllable dust generation rate, adjustable dust generation rate, large range, wide adaptability and micron dust generation is required.

Utility model content

The utility model aims to solve some deficiencies of the current dust generator, so that the dust is not easy to agglomerate in the process of dust generation, and it is not easy to block the discharge port, and the utility model has the advantages of uniform and stable dust generation, infinitely adjustable dust generation, small size, and structure. Simple, low cost, can generate dust for fine particles, adjustable dust generation rate and large range, and can meet the requirements of experiments for different dust generation rates.

For achieving the above object, the technical scheme adopted by the present utility model is:

A stepless adjustment screw type dust generator, comprising a conical dust container, a conveying pipe connected with a discharge port below it, and a direction-changing dust conveying device connected with the conveying pipe, the conveying pipe is arranged horizontally, and the conical dust container is inside the conical dust container. There is a triangular stirring rod driven and rotated by an adjustable frequency micro motor. The triangular stirring rod is arranged close to the discharge port of the conical dust container, and can be close to the conical dust container when it rotates around the axis of the discharge port of the conical dust container. When the triangular stirring rod stops moving, there is a channel for dust to pass between the triangular stirring rod and the discharge port of the conical dust container;

The conveying pipe is sleeved on the outer periphery of the screw, the screw pitch is 5-20 mm, one end of the screw passes through the bearing at the end of the conveying pipe and is driven by the adjustable frequency side motor, and one end of the screw is installed on the bearing at the other end of the conveying pipe. In clearance fit with the conveying pipe, the bearing seals the two ends of the annular space between the conveying pipe and the screw, and the variable-direction dust conveying device is arranged below the end of the conveying pipe that is far away from the motor on the adjustable frequency side. One end is provided with an electric fan, and the other end is provided with a fixed impeller. The electric fan draws air into the dust conveying pipe and carries the dust discharged from the conveying pipe through the fixed impeller to the outside of the outlet end of the dust conveying pipe.

The upper end of the conical dust container is provided with a disc cover that can be opened, the lower end of the conical dust container is a conical ash hopper, the discharge port is located at the bottom end of the conical ash hopper, and the triangular stirring rod includes a cantilevered ash hopper. A shaft driven by a frequency-modulated micro-motor and a rib connected to the lower part of the shaft. The shaft is arranged concentrically with the conical hopper and the discharge opening. The rib and the lower part of the shaft form a triangular member close to the inner circumference of the conical hopper. The bottom end of the shaft does not contact the screw rod, and the top end of the shaft passes through the disc cover and is connected with the adjustable frequency micromotor fixed in the center of the disc cover through a connecting rod.

The direction-changing dust conveying device includes a transverse dust conveying device and a longitudinal dust conveying device. The transverse dust conveying pipe is a T-shaped three-way pipe, which has a vertical end that communicates with the discharge port of the conveying pipe, and is provided with an electric fan respectively. 2. The two horizontal ends of the fixed impeller; the longitudinal dust conveying pipe is a Y-shaped four-way pipe, the upper end of which is connected with the outlet of the conveying pipe by bolts, the lower end is built with a fixed impeller, and the left and right sides are provided with an angle between the upper end and the upper end. 30° branch pipes, and electric fans are installed in the branch pipes on the left and right sides.

Compared with the prior art, the beneficial effects of the present utility model:

1. By adding a triangular stirring rod in the conical dust container, the falling of dust at the hole is accelerated, so that the discharge port of the conical dust container is not easy to bridge and block. The dust is stirred more fully and evenly, reducing the possibility of agglomeration and reducing the dust retention on the wall of the ash chamber.

2. By arranging a screw under the conical dust container, after the dust falls evenly on the screw thread, the dust can be transported forward stably under the action of the stable rotating forward airflow formed during the ash feeding process, and the dust can be obtained at the dust feeding port. Stable dust conveying capacity, the screw pitch is controlled at 5-20mm, which can effectively avoid material jamming and uneven discharging.

3. Drive the triangular stirring rod in the ash feeding process by the micro motor, set the corresponding stirring rate according to different particle sizes, and control the speed of the screw by setting the frequency-adjustable side motor on the screw of the ash feeding process, so as to control the dust feeding amount. The stepless adjustment of the dust generation rate can be achieved, which can reach 5-200g/min, which can meet the requirements of different dust generation rates in the experiment. Uniform and stable dust generation, so that the fine particles after dust generation have a high degree of dispersion and are closer to the industrial state.

4. The direction-changing dust conveying device is detachable. Connecting this device can change the direction of dust conveying and improve the applicability of the device. The fixed impeller further promotes the dispersion of dust, and the electric fan also prevents the deposition of dust.

Description of drawings

Fig. 1 is the structural representation of the horizontal dust conveying of the utility model;

Fig. 2 is the structural representation of the longitudinal dust conveying of the utility model;

Fig. 3 is the left side view of the support frame of the present utility model;

Fig. 4 is the top view of the support frame of the utility model;

Fig. 5 is the dust generation stability test data of the utility model device;

Fig. 6 is the fitting curve of the dust generation amount of the utility model device;

In the figure, 1 is a stirrer, 1-1 is a frequency-adjustable micromotor, 1-2 is a triangular stirring rod, 2 is a conical dust container, 2-1 is a disc cover, 2-2 is a fastening button, 2-2 is a -3 is conical ash hopper, 2-4 is transparent strip, 3 is screw conveying device, 3-1 is bearing, 3-2 is screw, 3-3 is conveying pipe, 3-4 is coupling, 3- 5 is the adjustable frequency side motor, 4 is the support frame, 4-1 is the reinforcing plate, 4-2 is the support side plate, 4-3 is the triangular support plate, 4-4 is the support concave table, 4-5 is the bottom plate, 5 It is a horizontal dust conveying device, 5-1 is a horizontal dust conveying pipe, 5-2 is an electric fan, 5-3 is a fixed impeller, 6 is a longitudinal dust conveying device, and 6-1 is a longitudinal dust conveying pipe

Detailed ways

The present invention will be further described below with reference to the accompanying drawings.

As shown in Fig. 1 to Fig. 4, a stepless adjustment screw type dust generator of the present invention comprises a conical dust container 2 and a conveying pipe 3-3 arranged laterally below it. The upper end of the conical dust container 2 is provided with an openable disc cover 2-1, the lower end of the conical dust container 2 is a conical ash hopper 2-3, and the discharge port is located at the bottom end of the conical ash hopper 2-3 , there is a transparent strip 2-4 on the side, which can realize the visualization of dust margin. The disc cover 2-1 is tightly connected with the conical ash hopper 2-3 through the fastening button 2-2, and forms an ash-loading chamber; The dust container 2 is also provided with a triangular stirring rod 1-2. The triangular stirring rod 1-2 includes a shaft and a rib connected to the lower part of the shaft. The shaft is arranged concentrically with the conical ash hopper 2-3 and the discharge port. The rib and the lower part of the shaft form a triangular member close to the inner circumference of the conical hopper 2-3, the bottom end of the triangular stirring rod 1-2 does not contact the screw 3-2, and the top of the triangular stirring rod 1-2 passes through The disc cover 2-1 is connected with a frequency-adjustable micromotor 1-1 fixed at the center of the disc cover 2-1. The conveying pipe 3-3 is sleeved on the outer circumference of the screw 3-2, the screw pitch is 5-20mm, one end of the screw 3-2 passes through the bearing 3-1 at the end of the conveying pipe 3-3, and passes through the coupling 3-4 It is connected and fixed with the frequency-adjustable side motor 3-5, the other end of the screw 3-2 is installed on the bearing 3-1 at the other end of the conveying pipe 3-3, and the screw 3-2 is in clearance fit with the conveying pipe 3-3, and the conveying pipe The annular space between 3-3 and the screw 3-2 is closed by the bearings 3-1 at both ends to form a sealed dust chamber. The dust conveying pipe 5-1 is arranged below the end of the conveying pipe 3-3 away from the frequency-adjustable side motor 3-5.

The utility model is a stepless adjusting screw type dust generator, which has two modes of horizontal dust discharge and longitudinal dust discharge. Among them, the horizontal dust conveying pipe 5-1 is a T-shaped three-way pipe, the diameter of the vertical end interface communicated with the discharge port of the conveying pipe 3-3 is 2 cm, and the electric fans 5- 2 or fixed impeller 5-3, the distance from the edge of the interface is 3 cm, and the diameter of the horizontal end interface with the fixed impeller is 4 cm.

The longitudinal dust conveying pipe 6-1 is a Y-shaped four-way pipe. The diameter of the upper interface connected with the discharge port of the conveying pipe 3-3 is 2 cm, and the diameter of the lower interface as the dust conveying port is 4 cm. The impeller is also provided with left and right interfaces at a position of 30° with the upper interface, and an electric fan is installed inside, and the distance between the electric fan and the fixed impeller and the edge of the interface is 3 cm.

The upper joint of the ribs 1-2 of the triangular stirring rod is at the midpoint of the shaft, and the lower joint is 1cm away from the bottom end of the shaft.

As shown in Figures 3 and 4, the conveying pipe 3-3 is welded to the support concave table 4-4, the frequency-adjustable side motor 3-5 is fixed to the support side plate 4-2 through flanges and bolts, and the support concave table 4-4 It is connected and reinforced with the supporting side plate 4-2 by the reinforcing plate 4-1, and the supporting concave platform 4-4 and the supporting side plate 4-2 are both installed on the bottom plate 4-5, and one side of the supporting side plate 4-2 is Two triangular support plates 4-3 are welded to strengthen the support stability.

Practical test:

The stepless adjustment screw type dust generator of the present utility model is used to eject different types of dust, and the experimental results are shown in Table 1 below.

Table 1

The indicated value of the governor in Table 1 is the speed regulation gear value of the motor 3-5 on the adjustable frequency side. The indicated value of the governor shown in Table 1 is only the value selected in the experiment. The governor can realize stepless speed regulation. The frequency-adjustable side motors 3-5 are AC motors. The existing AC motor speed regulation circuit controls the high-speed switching of the electronic switch by outputting a high-speed PWM (pulse width modulation) signal from the controller to realize the speed regulation of the AC motor, such as the patent CN3- The existing speed control circuit introduced by 2780032-3A includes a first rectifier circuit, a switch circuit and a freewheeling circuit that provide a power supply circuit for the AC motor, and an MCU that controls the switch circuit to switch the switch state. The switch circuit is turned on in the switch state. When the switch circuit is switched off, the induced electromotive force generated on the windings of the AC motor is discharged through the freewheeling circuit, and the MCU In the control period, the PWM signal is output according to the preset frequency change rule to realize the switch state switching of the control switch circuit, thereby realizing the operation and speed regulation of the AC motor.

As shown in Table 1, the frequency-adjustable side motor 3-5 is driven by the speed-regulating gear value, so that the screw 3-2 can output dust materials at different discharge rates at different speeds, and at the same time, the power is transferred through the AC motor speed-regulating circuit. The speed of the fan 5-2 is set to different gears, and the output air volume of the electric fan 5-2 is different. The dust concentration of the flue gas.

Practical test:

The stepless adjustment screw type dust generator of the present utility model sprays pulverized coal when the speed adjustment gear value is 50, and the dust generation per unit time is measured as shown in Figure 5 below;

The arithmetic mean value of the 8 groups of data measured is: 70.108g/min. Through data processing, the relative deviation of each group of data is in the range of -0.99% - 1.01%, which reflects to a certain extent that the amount of dust generated per unit time is stable. .

It can be seen from Figure 6 that the correlation coefficient is 1, and when the speed control gear value is 50, the fitting degree of the fitting curve of the amount of dust generated by the sprayed pulverized coal over time is very good, and the fitting curve expression reflects the unit time The dust generation increment is stable at a constant value, which verifies the dust generation stability.

Claims (3)

1. A stepless regulation screw type dust generator comprises a conical dust container (2), a conveying pipe (3-3) communicated with a discharge port below the conical dust container, and a direction-changing dust conveying device (5/6) communicated with a discharge port of the conveying pipe (3-3), wherein the conveying pipe (3-3) is transversely arranged, it is characterized in that a triangular stirring rod (1-2) driven by a frequency-adjustable micro motor (1-1) to rotate is arranged in the conical dust container (2), the triangular stirring rod (1-2) is arranged close to the discharge opening of the conical dust container (2), and can move close to the inner circumference of the conical dust container (2) when rotating around the axis of the discharge opening of the conical dust container (2), when the triangular stirring rod (1-2) stops moving, a channel for dust to pass through is arranged between the triangular stirring rod (1-2) and the discharge port of the conical dust container (2);

the conveying pipe (3-3) is sleeved on the periphery of the screw rod (3-2), the screw pitch of the screw rod is 5-20mm, one end of the screw rod (3-2) penetrates through a bearing (3-1) at the end part of the conveying pipe (3-3) and is driven by a frequency-adjustable side motor (3-5), the other end of the screw rod (3-2) is installed on the bearing (3-1) at the other end of the conveying pipe (3-3), the screw rod (3-2) is in clearance fit with the conveying pipe (3-3), the bearing (3-1) seals two ends of an annular space between the conveying pipe (3-3) and the screw rod (3-2), the direction-changing dust conveying device (5/6) is arranged below one end, far away from the frequency-adjustable side motor (3-5), of the direction-changing dust conveying device (5/6), of the electric fan (5-2) is arranged at one end in the dust conveying pipe, the other end is provided with a fixed impeller (5-3), and the electric fan (5-2) pumps air into the dust conveying pipe to carry the dust discharged by the conveying pipe (3-3) to be dispersed and blown out of the outlet end of the dust conveying pipe through the fixed impeller (5-3).

2. The stepless adjusting screw type dust generator as claimed in claim 1, wherein the upper end of the conical dust container (2) is provided with an openable disc cover plate (2-1), the lower end of the conical dust container (2) is provided with a conical ash bucket (2-3), the discharge port is positioned at the bottom end of the conical ash bucket (2-3), the triangular stirring rod (1-2) comprises a shaft rod which is driven by the frequency-adjustable micro motor (1-1) to rotate, and a rib which is connected with the lower part of the shaft rod, the shaft rod is concentrically arranged with the conical ash bucket (2-3) and the discharge port, the rib and the lower part of the shaft rod enclose a triangular component close to the inner circumference of the conical ash bucket (2-3), the bottom end of the shaft rod is not contacted with the screw rod (3-2), and the top end of the shaft rod passes through the disc cover plate (2-1) and is connected with the frequency-adjustable micro motor (1-1) fixed at the center of the disc cover plate (2-1) The rods are connected.

3. The stepless adjustable screw-type dust generator of claim 1, wherein the direction-changing dust conveying device comprises a transverse dust conveying device (5) and a longitudinal dust conveying device (6),

the transverse dust conveying pipe (5-1) is a T-shaped three-way pipe and is provided with a vertical end communicated with the discharge hole of the conveying pipe (3-3) and two horizontal ends respectively provided with an electric fan (5-2) and a fixed impeller (5-3);

the longitudinal dust conveying pipe (6-1) is a Y-shaped four-way pipe, the upper end of the longitudinal dust conveying pipe is connected with the discharge port of the conveying pipe (3-3) through a bolt, a fixed impeller is arranged in the lower end of the longitudinal dust conveying pipe, branch pipes with an included angle of 30 degrees with the upper end are arranged on the left side and the right side, and electric fans are arranged in the branch pipes on the left side and the right side.

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