JPS64596Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention prevents the adverse effects caused by variations in the physical properties of the filter paper in a device that continuously collects and measures the amount of suspended matter using tape-shaped filter paper. The present invention relates to a filter paper driving device that obtains accurate measurement results.

Generally, when sampling various substances in the atmosphere on a filter paper and measuring the amount, gravimetric method, light transmission method, radiation irradiation method, etc. are used to measure the difference between before and after sampling on the filter paper. We are looking for a quantity per unit time.

However, this measurement method poses no problems if the sampling time is relatively short and the filter paper is removed after each sampling.
When performing unattended continuous measurements over a long period of time, a long tape-shaped filter paper is used, and variations in the detection means and the thickness of the filter paper affect the measurement results.

In other words, when sampling a substance suspended on a tape-shaped filter paper for a certain period of time at a constant speed, the amount of permeation through the filter paper before sampling is measured in the detection section, and then the filter paper is moved to the collection section. After sampling the suspended matter there, the detection section measures the amount of permeation after sampling, calculates the amount of trapped material from the difference before and after, and repeats this at regular intervals for continuous measurement.

In such a measurement operation, either two detection units are installed or one detector is moved to measure the amount of permeation before and after the floating matter is collected.

In the former case, variations among the detection units themselves become a problem, and selecting the same detection unit is time consuming and difficult, and furthermore, the measurement path becomes long. Furthermore, when the detector is moved as in the latter case, position reproducibility becomes a problem.

Therefore, the present invention uses a single detector and moves the tape-shaped filter paper back and forth between the detection section and the collection section, thereby eliminating distortion of the filter paper caused by the difference in mechanical configuration between the forward and return trips. In order to minimize changes in physical properties such as thickness, the purpose is to always apply a constant tension to the filter paper to improve position reproducibility.

That is, the present invention provides fixedly provided 1
A tape-shaped filter paper is run in a collection/measurement block consisting of two detection parts and a collection part by a rotating rotating body such as a capstan shaft and a capstan roller, and collection and measurement are performed continuously. In the continuous floating matter collection/measuring device, a pair of moving rollers on which the tape-shaped filter paper is wound are provided between a tape-shaped filter paper delivery reel and the block, and between a tape-shaped filter paper take-up reel and the block, respectively. are installed so as to be movable in the front and back direction of the tape-shaped filter paper in the block, and the rotating shafts of these pair of moving rollers are pivotally connected to a spacing plate at a predetermined interval, and each of the moving rollers and A tension mechanism is interposed in the filter paper tape between each reel, and a tension detector for operating the delivery reel is installed on the tension mechanism on the delivery side of the filter paper tape and one of the moving rollers, and a tension mechanism on the winding side of the filter paper tape. and a tension detector for operating the take-up reel is interposed on one of the moving rollers, and the distance between the detection point of the detection section and the collection point of the collection section is set to correspond to the circumferential length of the clamping rotating body. The present invention relates to a filter paper drive device in a continuous floating matter collection/measuring device characterized by the following characteristics.

Below, an embodiment of the device according to the present invention will be described with reference to the drawings. A collection/measuring block 1 includes a detection section 2 consisting of a single detector, and a floating object constituting the collection section approximately in the center. A suction tube 3, a capstan shaft 4 on the opposite side of the detection unit 2 across the suction tube 3, and a capstan roller 5 for bringing the filter paper into close contact with the capstan shaft 4 are arranged. The middle of the measuring block 1 is divided into upper and lower parts so that a tape-shaped filter paper can be passed through at right angles to the suction tube 3, and a groove 6 is formed.
is formed.

There is a measurement point A in the center of the detection part 2, and a collection point B in the center of the suction tube 3, and this interval is determined by the capstan shaft 4.
It is set to correspond to the circumference of.

The interval between AB is preferably set to an integral multiple for convenience of work, and in this example, 2
It is set to double.

On the left and right extension of the divided lower part 1' of the collection and measurement block 1, the collection and measurement block 1
Moving rollers 7 and 7' are installed symmetrically around the suction tube 3 on a chassis 17 fixed to the same. That is, the moving rollers 7, 7' are
The shafts 20, 20' are rotatably attached via ball bearings 19, and the lower ends of these shafts 20, 20'
16'.

Each of these movable tables 16, 16' is arranged between the V-grooves 21, 22, which are disposed on a guide bar 23 fixed to the chassis 17, and a V-groove 22, which is disposed on the opposite position. ball bearing 1
8, it is movably installed relative to the chassis 17.

Furthermore, both moving tables 16, 16' are connected to a spacing plate 8 formed of an L angle at a predetermined interval, so that the moving rollers 7, 7' are always kept at a constant interval. to move left and right (back and forth in the direction of travel).

Tension rollers 9, 9', a feed reel 10, and a take-up reel 11 are arranged symmetrically below the moving rollers 7, 7' and closer to the center than the moving rollers 7, 7'.

The tension rollers 9 and 9' rotate with the movement of the wound filter paper 15, and can be moved slightly parallel to the left and right, and have springs 12 and 12' at the bottom.
are connected to each other to adjust the tension of the tape-like filter paper 15 as it moves.

That is, when the tension applied to the filter paper 15 adjusted by the springs 12, 12' weakens, the tension roller 9 moves to the left, and the other tension roller 9' moves to the right. Further, when the tension of the filter paper is strong, the tension roller 9 moves to the right, and the tension roller 9' moves to the left.

The tension roller 9 has a tension detector 13 for operating the delivery reel, and the moving roller 7' has a tension detector 14 for operating the take-up reel.
is installed.

In order to collect and measure floating substances in the atmosphere using the device of the present invention, first pull out the tip of the tape-shaped filter paper 15 wound up on the feed reel 10, and sequentially apply it to the tension roller 9 and the moving roller 7 to collect and measure the suspended matter in the atmosphere. It passes through the measurement point A of the divided groove 6 of the block 1, the collection point B, between the capstan shaft 4 and the capstan roller 5, and is then applied to the moving roller 7', the tension roller 9', and the take-up reel 11.
Pull it out and wrap it around, fix the tip there,
Adjust the tension of the filter paper 15.

That is, when the capstan shaft 4 starts rotating counterclockwise, the filter paper 15 moves from right to left (forward direction). At this time, since the moving rollers 7 and 7' are stopped, the tension on the filter paper 15 is increased by the tension roller 9, and the moving rollers 7 and 7'
is moved from right to left by the capstan shaft 4 by 1/2 of the distance that the filter paper was moved, and the tension applied to the filter paper 15 is equal to both tension rollers 9, 9' by the tension rollers 9, 9'. Become. When the filter paper 15 continues to move further, the moving rollers 7 and 7' move further to the left, the tension detector 14 detects insufficient tension on the filter paper 15, and the take-up reel 11 is activated to wind up the filter paper 15. .
When the filter paper 15 is wound onto the take-up reel 11, the tension on the filter paper 15 is increased by the tension roller 9', the moving rollers 7, 7' move to the right, and the tension applied to the filter paper 15 is increased by the tension roller 9' and the tension roller 9'. It is also equal to 9'.

When the filter paper 15 is sufficiently wound up, the tension detector 14 detects the tension of the filter paper and the take-up reel 1
1 stops.

During this time, the tension applied to the filter paper 15 by the tension roller 9 increases, so the tension detector 13
detects the excessive tension, the feed reel 10 feeds out the filter paper 15, and the tension roller 9,
The tension due to 9' is kept constant,
While the capstan shaft 4 rotates once in the counterclockwise direction, the filter paper 15 moves from the delivery reel 10 to the take-up reel 11 by the circumference of the capstan shaft 4.

The above is the initial operation and operation from setting the filter paper to starting measurement.

Next, the measurement operation begins according to a preset program.

First, the filter paper 15 that has been moved is measured at measurement point A for the amount of permeation through the filter paper before collection.

Next, the capstan shaft 4 rotates counterclockwise twice to move the filter paper 15 to the collection point B.

The drive of the feed reel 10 and the take-up reel 11 is designed to stop after feeding a new filter paper 15 to a certain length, so they are stopped at this time, so the rotation of the capstan shaft 4 causes The filter paper 15 moves to the left, tension is applied to the filter paper 15 by the tension roller 9, and tension is weakened by the movement of the filter paper 15 by the tension roller 9', causing the tension rollers 9 and 9' to become unbalanced.

Therefore, the moving rollers 7 and 7' move to the left while rotating counterclockwise, and move to a position where the tension of the filter paper 15 becomes constant by the tension rollers 9 and 9'. ' are connected to each other, the filter paper 15 moves to the left while maintaining a constant distance and tension, and the part of the filter paper 15 that is at the measurement point A moves to the collection point B.

At the collection point B, the suction tube 3 clips the filter paper 15, and after performing a predetermined sampling, the filter paper 15 is unclipped and the capstan shaft 4 is rotated twice clockwise. Then, the filter paper 15 is placed at the collection point B.
The part returns to the measurement point A of the detection unit 2 and stops. In this case as well, both the take-up reel 11 and the feed-out reel 10 are stopped, so when the capstan shaft 4 rotates clockwise, the tension roller 9' has a stronger leftward tension, and the filter paper 15 tries to move to the right. .

Then, the filter paper 15 is moved in parallel to the right while already being applied with a certain tension by the spacing plate 8 connected to the moving rollers 7 and 7'.

In this way, the filter paper 15 returns to the initial measurement point A, the amount of permeation after collecting suspended matter is measured, and the amount of collected material is calculated by a separately connected known arithmetic processing section (not shown). One cycle ends.

Thereafter, continuous measurements are performed by repeating the same operation.

Therefore, according to the present invention, the filter paper is moved back and forth between the measurement point and the collection point while a certain tension is applied to it, that is, it moves back and forth over a distance determined by the circumference of the capstan shaft. , the distance moved by the clockwise or counterclockwise direction of the capstan shaft is always constant, and not only is it almost unaffected by changes in physical properties such as distortion and thickness of the filter paper, but it is also difficult to reproduce the position of the filter paper. It has good properties, and has the effect of providing accurate measurement results and stable measurement in continuous measurement of suspended matter.

[Brief explanation of the drawing]

The drawing shows an embodiment of the filter paper drive device in the continuous floating matter collection and measurement device according to the present invention.
FIG. 1 is a schematic front view of an embodiment of the apparatus, FIG. 2 is a partial sectional view of a moving roller, and FIG. 3 is a side view of FIG. 2. 1... Collection/measurement block, 2... Detection section, 3
...Collection unit, 4... Capstan shaft (pinch rotating body), 5... Capstan roller (pinch rotating body), 7, 7'... Moving roller, 8... Spacing plate, 9, 9' ... Tension roller (tension mechanism), 10 ... Delivery reel, 11 ... Take-up reel, 13, 14 ... Tension detector, 15 ... Tape-shaped filter paper, 20, 20' ... Rotating shaft, A ... ...Measurement point, B...Collection point.

Claims (1)

[Scope of utility model registration request] A tape-shaped filter paper is run and captured by a rotating rotating body such as a capstan shaft and a capstan roller in a collecting/measuring block consisting of a detecting part and a collecting part, each of which is fixedly provided. In a continuous floating matter collection/measuring device that continuously performs collection and measurement, the tape-shaped filter paper is wound between the feed reel of the tape-shaped filter paper and the block, and between the take-up reel of the tape-shaped filter paper and the block. A pair of rotated moving rollers are installed so as to be movable in the front-rear direction of the tape-shaped filter paper in the block, and the rotating shafts of the pair of moving rollers are pivoted to a spacing plate at a predetermined interval. At the same time,
A tension mechanism is interposed between each of the moving rollers and each reel of the tape-like filter paper, and a tension detector for operating the delivery reel is provided on the tension mechanism on the sending side of the tape-like filter paper and one of the moving rollers. A tension detector for operating the take-up reel is interposed between the tension mechanism on the take-up side and one of the moving rollers, and the distance between the detection point of the detection section and the collection point of the collection section is determined by the circle of the clamping rotating body. A drive device for filter paper in a continuous floating matter collection/measuring device, characterized in that it is determined in accordance with the circumference.