JPH052840Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sampler for efficiently collecting a representative sample for quality control from a so-called air slide type powder pneumatic transportation device.

[Conventional technology]

As a device for collecting a representative sample for management from powder being transported in large quantities, there is a sampling device equipped with a collection amount control device that rotates a rotating basket as shown in Fig. 2 at the chute of the powder transportation route; Alternatively, a vibrating sampler as shown in FIG. 3 is used.

The sampling device shown in FIG. 2 rotates a rotary bucket 21 for sampling a sample from a powder transport route using a drive device 22.
The rotation speed of 2 is determined by measuring the amount passing through the powder transport route 24 with a flow meter 23 installed on this route 24.
The system is such that the rotation speed of the drive device 22 is controlled according to the measured value, and the sampling amount can be changed in proportion to fluctuations in the flow rate in the path.

The sampling device shown in FIG. 3 has a sampling hole 27 inserted into a chute 26 of the powder transport route, and an open pipe 28 inserted into the chute through an elastic material 31 at an angle smaller than perpendicular to the flow direction 30 of the powder. A vibrator 29 is attached to the end of the pipe 28, and the operating time of the vibrator 29 and the installation angle of the pipe 28 are determined.
The amount to be collected is adjusted by the diameter of the sampling hole 27 and the number of holes 27.

[Problem that the invention attempts to solve]

The sampling device shown in Figure 2 has good sampling accuracy because the amount collected can be changed according to changes in the amount of transportation, but there are problems such as the device is complex and requires a relatively large installation space. Almost never put into practice.

The device shown in FIG. 3 is a device that is widely used because the device itself is simple and compact. As mentioned above, the amount of sample collected by this device is determined by the operating time of the vibrator 29 attached to the end of the sampling tube, the diameter of the sampling tube 28, the diameter and number of sampling holes 27 drilled at the tip of the tube, etc. The measurement accuracy will improve if the sampling amount is increased and the reduction ratio relative to the transported amount is reduced, but the reduction operation after sampling becomes complicated, so it is recommended to increase the reduction ratio relative to the transported amount. The amount of sample collected per unit time had to be reduced.

Therefore, due to the relationship with the amount of sample collected per unit time, it was not possible to collect samples continuously, and even if the amount of transportation varied, only a substantially constant amount was collected without responding to the fluctuations. In addition, the hole diameter, number of holes, and mounting angle of the sampling pipe cannot be made larger than the relationship with the amount of sample to be collected, which not only causes frequent clogging, but also makes it difficult to continuously collect a certain amount of sample. It was necessary to pay close attention to maintenance and inspection. Furthermore, depending on the mounting position, there were problems such as not being able to collect a representative sample because the particle size separation effect occurred when the powder fell down the chute of a transporter or the like.

The object of the present invention is to solve the above-mentioned problems and provide a sampler that can continuously collect samples from a powder transport route, has a small size and simple structure, and has fewer accidents such as clogging.

[Means for solving problems]

The sample collector of the present invention has a sample collector installed inside a so-called air slide. The air slide is a powder transport device in which a canvas is installed in a downward-sloping duct to partition the cross section of the duct into upper and lower parts, the space below the canvas is used as a compressed air chamber, and the space in the canvas is used as a powder transport chamber.

The present invention is installed within the cross section of such a so-called air slide type powder transport device, and is constructed by combining the following elements. That is, it consists of (1) a retention chamber for the diverted powder, (2) a baffle plate hanging down from the upper end of the retention chamber, (3) a weir installed upright at the downstream end of the retention chamber, and (4) an opening at the bottom.

In addition, a hopper for storing the collected powder is provided at the lower end of the powder collection chamber, and at the outlet of the hopper, a rotary valve or screw conveyor whose rotation speed is changed according to a signal emitted from a powder measuring device is provided. It is a good idea to control the amount collected by installing something like this.

[Effect]

The powder in the retention chamber 1 is pushed by the powder pressure on the introduction side, that is, the upstream side, and is temporarily stopped by the weir plate 8 in the process of overflowing over the weir plate 8 and being discharged outside the retention chamber 1. At the same time, when passing under the baffle plate 7, it is pushed downward, so that the hopper 6 connected to the lower end of the retention chamber is constantly filled and pressed. Therefore, the powder in the hopper 6 is temporarily stopped flowing and is pressed down from above, so that it does not float, and the powder can be smoothly discharged from the hopper 6.

If a continuous extraction device is attached below the hopper 6, a representative powder sample can be collected in proportion to the flow rate flowing through the air slide.

〔Example〕

An embodiment of the sample collector of the present invention will be explained based on FIG.

Unadjusted raw material powder crushed for cement production
A sample collector as shown in Figure 1 was installed in the center of an air slide with a width of 406 mm and a height of 386 mm that was transported at 230 T/h.

The collecting device of the present invention consists of a main body consisting of a rectangular tube with a width of 100 mm, a length of 130 mm, and a height of 386 mm, and an inlet for introducing the powder with a width of 40 mm and a length of 35mm wide with a 304mm opening
A flange with a length of 304 mm is installed vertically, and the width is 100 mm at an angle of 15 degrees inside the main body from the upper end (top plate) of the opening.
A baffle plate with a length of 235 mm was installed. In addition, a length of 154 mm from the upper end is placed in the center of the surface facing the inlet.
Width 40mm opening (outlet) and height (length) 150mm
A sample collector with a weir plate was installed.

Fig. 1a is a longitudinal sectional view of the air slide when the sample collector of the present invention is installed in the air slide, Fig. 1b is a view taken along the line B-B, and Fig. 1c is a vertical cross-sectional view of the air slide. It is a CC arrow view of figure a.

The sample collector of the present invention is equipped with a retention chamber 1 for divided powder provided in the cross section of an air slide type powder transport path 10, and the powder on the upstream side with respect to the flow direction of the powder of the air slide is transferred to the retention chamber. 1, and an opening 3 for discharging the powder from the retention chamber 1 on the downstream side, and a flange is provided so as to form a groove-like passage along each opening 2, 3. 4 is installed. The upper end of this retention chamber 1 is attached to the ceiling of the air slide casing 5. The lower end of the retention chamber 1 passes through the bottom of the air slide casing 5 and connects to a hopper 6 provided outside the air slide.
is connected to. The retention chamber 1 has a central cross section larger than the cross sections of the inlet/outlet openings 2 and 3 in order to divert a portion of the powder flowing through the air slide and slow down the moving speed of the inflowing powder. Inside this retention chamber 1, there is a baffle plate 7 installed diagonally in the flow direction of the powder below the upper end of the introduction side opening 2. This acts to slow down the flow rate of the powder and to push the powder downward so that it passes under the baffle plate 7. Further, the discharge side opening 3 is provided with a weir plate 8 that stands up from its lower end, and prevents the powder that has penetrated the baffle plate 7 from flowing out and makes it stay there.

The size and number of retention chambers 1, the installation angle and dimensions of the baffle plates 7, and the dimensions of the weir plate 8 will vary depending on the transport capacity of the air slide, the amount of powder transported and the amount collected (reduction ratio), etc. It may be determined as appropriate.

It is preferable that the lower end of the baffle plate 7 and the upper end of the weir plate 8 are staggered, but it is preferable that the lower end of the baffle plate 7 is located in the fluidized powder path and has a structure that performs the above-mentioned action. The positions of the lower end of the baffle plate 7 and the upper end of the weir plate 8 are not limited.

In addition, the flanges 4, which are provided to form grooves along the openings for introducing and discharging powder into the retention chamber 1, prevent disturbances in the powder flow within the air slide that occur at the openings. Moreover, the groove formed by the flange 4 rectifies the flow of powder.

Although the shape of the retention chamber 1 is square in this embodiment, it may be of other shapes, such as a circle or a polygon.

A hopper with a connected discharge port is installed, and a screw conveyor with a groove to adjust the withdrawal amount is attached to the discharge port, but fluctuations in the withdrawal amount due to hopper clogging and flushing phenomena rarely occur. It's not on.

[Effect of idea]

As a result of installing the powder sampling device of the present invention inside a powder transporter, it is possible to follow the amount of collected material even if there are large fluctuations in the amount of transportation, and it is also possible to avoid phenomena such as clogging of powder inside the sampler. Since it is possible to continuously extract the necessary amount without any problems occurring, it is possible not only to improve measurement accuracy, but also to simplify the reduction operation, etc., which makes it possible to save labor in the measurement operation.

[Brief explanation of drawings]

FIG. 1a is a longitudinal sectional view of the powder collector of the present invention, FIG. 1b is a view taken along the line B-B, and FIG. 1c is a view taken along the line C-C in FIG. 1a. . FIG. 2 is a schematic diagram of a conventional collector. FIG. 3a is a longitudinal sectional view of a conventional collector equipped with a vibrator, and FIG. 3b is a view taken along the line A--A. DESCRIPTION OF SYMBOLS 1... Retention chamber, 2... Inlet side opening, 3... Discharge side opening, 4... Flange, 5... Air slide casing, 6... Hopper, 7... Baffle plate, 8
... Weir plate, 10 ... Air slide, 11 ... Powder, 12 ... Powder flow direction.

Claims (1)

[Scope of utility model registration request] A retention chamber for diverted powder provided in the cross section of the air slide type powder transport path, a baffle plate hanging down in the chamber, a weir plate erected at the trailing end of the chamber, and penetrating the bottom surface of the transport path. and a bottom opening for extracting powder from the chamber downward.