JPH087115B2 - Sampling method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a method for collecting a sample from a package falling from the end of a conveyor that transports powdery substances such as coal and ore, lumps or a mixture of the two. It is about.

[Conventional technology]

The one shown in FIG. 3 is disclosed in Japanese Utility Model Publication No. 56-3653, and a vertical rotary shaft 2 attached to the tip of a gantry 1.
Is driven by a driving device 3, and a sampling box 5 is provided at the end of the revolving arm 4 fixed to the lower end of the rotary shaft 2.

The sampling box 5 is opened at the top and bottom and provided with a bottom lid 6 that can be opened and closed at the lower opening. The bottom lid 6 is fixed to the tip of an opening and closing arm 7, and the middle portion of the opening and closing arm 7 is a shaft. It is swingably attached to the arm 4 by means of 8.

A support cylinder 9 surrounding the shaft 2 is fixed to the lower part of the tip of the gantry 1, a spiral opening / closing guide 10 is fixed to the support cylinder 9, and a wheel 11 provided at the rear end of the opening / closing arm 7 is opened / closed as described above. The bottom cover 6 is brought into contact with the lower surface of the guide 10 so that the bottom cover 6 is opened when the collection box 5 is directed toward the end of the conveyor 12 as shown by a solid line, and the bottom cover 6 is opened by turning 180 ° as shown by a chain line.

The sampling box 5 in the position shown by the solid line in FIG.
A part of the transported material falling from the inside into the chute 13 is sampled, and when the swivel arm 4 swivels 180 °, the bottom lid 6 opens and the sampled sample is discharged to the sample chute 14.

Although not shown in the drawing, the one disclosed in Japanese Patent Publication No. 55-2574 is provided with a sampling portion (cutter) for the sample at the tip of the swivel arm, and the swivel arm is swung to provide the main sampling portion. By passing the bottom end of the conveyor,
A part of the transported material falling from the conveyor is sampled, and the sampled sample is carried out to the sample conveyor by an inner conveyor provided in the shape of a swing arm.

[Problems to be Solved by the Invention]

In the above-mentioned Japanese Utility Model Publication No. 56-3653, the width of the sampling box opening is large (usually specified to be 3 times the maximum particle size of the transported material), and the transported material falling from the sample conveyor Since the sample is collected over the entire cross section, the sampled amount is excessive compared to the amount required for measurement, and the sampled sample needs to be subjected to secondary sampling again, which complicates the sampling process.

Also, in Japanese Examined Patent Publication No. 55-2574, since a conveyor is also provided on the swivel arm, the device becomes large, and since the opening width is large as in the above case, the sampling amount is large, so secondary sampling is necessary. There is such a problem.

In addition, a recess is provided in a sampling member such as a round bar that rotates around a horizontal axis and advances and retreats along a coaxial axis. However, there is a problem that the structure becomes complicated because the sample collecting member needs to move forward and backward.

An object of the present invention is to solve the problems of the conventional sampling method as described above and to provide a method for collecting a minimum amount of samples so that the secondary sampling is not necessary.

[Means and Actions for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a revolving frame that revolves with a vertically oriented revolving shaft with a revolving arm that revolves around a radial axial center. Using a sampling means provided with a sampling box having a sampling opening, in the forward movement process of the swivel frame, the sampling opening is directed downward and stopped once at an arbitrary position in the package to be dropped. The moving arm is rotated halfway around its axis, the package is sampled with the sampling opening facing upward, and then the swivel frame is moved back to the sample discharging position on the side of the sampling position to collect the sampling opening. The sample is discharged downward and the next sampling process is started from that position, whereby the sample is sampled at random positions within the entire cross section of the package. If you can collect from the position It is possible to suppress the collected sample to the minimum required to be.

〔Example〕

In the embodiment shown in FIGS. 1 and 2, 21 is a frame and 22 is a gear box provided on the frame 21.

A drive device 23 such as a cyclomotor with a brake is provided behind the gear box 22, and a shaft of the drive device 23,
The input shaft of the gear box 22 is connected by a coupling 24.

The output shaft of the gear box 22 is a vertical turning shaft 25, on which the intermediate portion of the turning frame 26 is fixed.

A substantially horizontal round bar-shaped rotating arm 29 is rotatably supported on the upper part of the revolving frame 26 by front and rear bearings 28,
The collection box 30 is fixed to the tip.

The sampling box 30 has a spoon-like shape with a sampling opening 31 on one side.

Here, the sampling opening 31 has the same width as the conventional one, but the volume of the sampling box 30 is determined by the minimum necessary sample amount (specified amount) to be sampled at one time.

Reference numeral 32 denotes a drive device provided on the rear end of the revolving frame 26, which is like a cyclomotor with a brake, and its shaft and the rotating arm 29 are connected by a coupling 33.

Reference numeral 34 denotes a support rail that is supported by a plurality of brackets 35 on the upper portion of the frame 21, and has an arc shape centered on the turning shaft 25.

A downward bracket 36 is fixed to the front end of the revolving frame 26 as shown in FIG. 2, and upper and lower support rollers 37 provided on the bracket 36 sandwich the upper and lower sides of the support rail 34.

The drive device 23 is controlled by a command from a control panel (not shown). Further, the driving device 32 causes the rotating arm 29 to rotate forward and backward by 180 ° in response to a signal from a limit switch or the like, so that the sampling opening 31 faces upward or downward.

Reference numeral 38 in FIG. 2 denotes a conveyer conveyor, and the collection box 30 is faced to the end thereof so that the collection box 30 enters the falling cross section a of the transported article 39 falling from the conveyor 38.

 Next, a sampling method with the above device opened will be described.

The origin of the rotating arm 29 is point A in FIG. 1, which is the sample discharge position. The sampling box 30 is stopped at this position with the opening 31 facing downward.

When a sampling command is issued from the control panel, the drive device 23 is activated, the swing frame 26 starts to swing, and the transport object 39 is rotated at a random position in the range of points B and C on both sides of the falling cross section a of the package 39. The moving arm 29 is stopped.

Under the condition that the rotating arm 29 is stopped between the point B and the point C as described above, the driving device 32 is activated to rapidly rotate the rotating arm 29 by 180 °, and the collecting opening 31 is directed upward. Receive article 39.

As soon as a sample, which is a part of the transported object 39, enters the collection box 30, the drive device 23 is actuated to swivel the swivel frame 26 toward the sample discharge position A, and at the point A, the swivel frame 26 is swung.
When the drive stops, the drive device 32 operates to rotate the rotating arm 29 180 °, discharge the sample to the sample chute with the opening 31 facing downward, and in this state, wait until the next sample collection command is issued. To do.

The stop control of the revolving frame 26 at a random position in the range between the point B and the point C requires a time T ₁ required for turning from the point A to the point B and a time T ₂ required from the point A to the point C. Then, a random time in the time range of T _{1 to} T ₂ is calculated by the calculator of the control panel, and when it is calculated as T seconds, it is controlled by a timer to start turning from point A and stop turning after T seconds. To do.

For the calculation of random time, a random value from 0 to 99 is generated by a random generator in the calculator, and the value is set to n.
Then, T is calculated by the following equation.

T = T ₁ + (T ₂ −T ₁ ) × n / 99 In addition to the control method by the timer as described above, a driving device
It is also possible to detect and control the number of rotations of 32 motors.

Further, as the driving devices 23 and 32, a rotary actuator using air or hydraulic pressure may be used instead of using a motor as in the embodiment.

〔The invention's effect〕

As described above, according to the method of the present invention, since a sample is sampled from an arbitrary random position within the entire cross section of the conveyed product falling from the conveyor, a representative sample without bias can be obtained.

Further, since the sample can be kept to a necessary minimum without being excessively taken, the amount of the sample taken is greatly reduced. Further, in the case of the method of the present invention, since the horizontal swivel range of the sampling box is from the sampling position of the sample to the sample discharging position on the side thereof, the time required for one sampling is shortened. As a result, the sampling ability is improved,
There is an effect that the space required for installing the sampling means is greatly reduced.

[Brief description of drawings]

FIG. 1 is a plan view of an apparatus for carrying out the method of the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a side view showing an example of a conventional apparatus. 23, 32 …… Drive device, 25 …… Swivel axis, 26 …… Swivel frame, 29 …… Swivel arm, 30 …… Sampling box, 31 …… Sampling opening, 28 …… Conveyor conveyor, 39 …… Transport Stuff.

Claims (1)

[Claims] 1. A sampling method for sampling a part of a transported article falling from a conveyor by means of sampling means provided at the end of a conveyor, in which a radial frame is provided on a revolving frame that revolves with a vertically oriented revolving shaft. A sampling arm provided with a rotating arm that rotates around a center, and a sampling box having a sampling opening on one side at the tip of the rotating arm is used. After stopping at any position in the package that is falling downward,
Half-rotate the rotating arm about its axis, sample the package with the sampling opening facing upward, and then return the swivel frame to the sample discharge position on the side of the sample collection position for sampling. A method for sampling, comprising discharging the sample with the opening facing downward and starting the next sampling step from that position.