JPS624653B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for automatically measuring moisture in a powder mixture of ore, coal, etc.

A conventional moisture measuring device is described in Japanese Utility Model Publication No. 52-52635. This known measuring device has one sample pan mounted on a movable vehicle body, and the sample pan is moved back and forth between the weighing machine and the sample input chute together with the vehicle body. Push the weighing machine up onto the car body using the plate support, place it on the weighing machine, measure the total weight of the sample before drying and the sample plate, dry the sample with an infrared lamp and blower, and then proceed as above. The weight of the sample and the sample plate after drying is measured by the above operation, and the moisture percentage is calculated from both of these measured values and the weight of the sample plate alone.

In the case of the above-mentioned conventional device, the time required for drying is short because the sample placed on one sample dish must be dried, the moisture percentage measured, and the next sample measured after this dried sample is discharged. If the time is longer than the time required for sample input and measurement (usually the time required for drying is longer), there is a problem that efficiency is extremely low.

In order to solve the problems of the conventional measuring device as described above, this invention enables a plurality of sample dishes to be dried simultaneously in a drying oven.
A reversible conveyor runs through this drying oven, and a sample tray on the conveyor that extends forward of the drying oven is pushed up so that it is directly under the sample input chute, and then lowered to input the sample. An electronic balance that lifts the sample plate onto the conveyor and measures the total weight of the sample and sample plate under the condition that the sample plate that received the sample is stopped before the drying oven. A weighing machine such as the above, and a function that lifts multiple sample plates that are sequentially received into the drying oven together with the samples after weighing, stops for a time set by a timer, then descends and places the sample plates on the conveyor. A plurality of sample plate lifting devices are used to lift the sample plate, and after the sample plate with the dried sample is weighed by the weighing machine, the sample plate placed on the conveyor is pushed out to the side of the conveyor and the sample on the sample plate is discharged. A sample discharging device that pushes the sample tray back onto the conveyor after discharging it into a chute, and a calculator that calculates the moisture percentage from the weight of the sample before drying, the weight of the sample after drying, and the weight of the sample tray on the same sample tray. It consists of

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

In the figure, reference numeral 1 denotes a frame of the apparatus of the present invention, and a sample input chute 2 is arranged at the upper part near the rear end.

A is a chain conveyor, which consists of a pair of left and right sprockets 3 fixed to rotating shafts provided at the front and rear of a frame 1, an endless chain 4 whose front and rear folded parts are engaged with the sprockets, and a chain 4 on the left and right. It consists of a large number of receiving plates 5 fixed at both ends at regular intervals, and is driven in forward and reverse directions by a drive mechanism M as shown in FIG.

Reference numeral 6 denotes a lifting platform located at the lower part of the input chute 2, which is located on a lifting cylinder 7 operated by air or hydraulic pressure, and extends between the left and right chains 4 of the conveyor A and the front and rear receiving plates 5. It's becoming like that.

Reference numeral 8 denotes an electronic balance as an example of a weighing machine placed adjacent to the lifting table 6. A base 9 made of a heat insulating material is placed on the tray of the electronic balance, and the balance 8 is equipped with an lifting cylinder operated by air or hydraulic pressure. 10, and the left and right chains 4 of the conveyor A and the front and rear receiving plates 5
Base 9 appears in between.

Further, on one side of the balance 8, there is provided an air or hydraulically operated pusher 12 for pushing the sample plate 11 on the chain 4 of the conveyor A to the other side of the balance 8. A rotary table 13 of a sample ejection device C is provided to receive the sample plate 11 pushed out.

The rotary table 13 rotates around a shaft 14 on the side of the frame 1 as shown in FIGS. 4 and 5, and is moved to the position indicated by the solid line in FIG. It rotates from to the state shown by the chain line.

Further, on the rotating table 13, there is also a sample plate 1 on the table.
A clamp pawl 16 is provided for gripping 1, and this pawl 16 is opened and closed by an appropriate driving means. Furthermore, a discharge chute 17 for the measured sample is provided at the bottom of the rotary table 13, and a pusher 18 is provided outside the rotary table 13 to return the sample tray 11 from which the sample has been discharged onto the conveyor A. An air nozzle 19 is provided above to blow off the remaining sample attached to the vertical sample plate 11 fixed on the table.

20 is a drying oven, and conveyor A is connected to this drying oven 20.
A plurality of sample dishes 11 can be housed inside the furnace. Further, this furnace 20 is provided with a plurality of sample plate lifting devices B. This device B consists of a lifting frame 21 and an air or hydraulic cylinder 22 for raising and lowering the lifting frame 21, and the frame 21 is provided with a clamp claw 23 that can be opened and closed.

Entrances and exits for the conveyor A are provided before and after the furnace 20, and the opening is made larger at the rear end for the sample dish 11 to enter and exit, and a door 24 that opens and closes using hydraulic pressure or an air cylinder 25 is provided to stop the conveyor A. The opening inside the furnace 20 is closed to the minimum extent possible, and the opening at the front end of the furnace 20 is set to the minimum extent that allows only the conveyor A to pass through.

As shown in FIG. 1, a leveling plate 26 for leveling the sample on the sample plate 11 and an air or hydraulic cylinder 27 for raising and lowering the plate are provided above between the lifting table 6 and the electronic balance 8.

This invention has the above configuration, and its operation will be explained next.

First, the temperature inside the drying oven 20 is raised to a constant temperature by an appropriate heating device, and then when a sample input preparation signal is received from the device at the previous stage of the device of the present invention, each lifting device inside the drying oven 20 B is lowered to place one sample plate 11 on conveyor A, conveyor A is moved to the right to move plate 11 onto lifting platform 6, and then conveyor A is stopped.

Next, the lifting platform 6 is raised and the tray 11 is brought close to the lower end of the chute 2 to enter the sample receiving state, and a sample loading OK signal is issued, and a certain amount of sample is accepted onto the tray 11 from the previous stage device.

When the sample is completely loaded, the cylinder 7 is opened, the lifting table 6 is lowered from the chain 4, and the sample plate 11 is placed on the receiving plate 5 of the conveyor A. Next, the conveyor A is started and the sample plate 11 is moved to the left in FIG.
6, the sample on the plate 11 is leveled, and then the leveling plate 26 is raised.

When the plate 11 is placed on the base 9, the conveyor A stops, the cylinder 10 is opened, the balance 8 rises, the plate 11 is placed on the base 9, and the plate 11 is moved away from the conveyor A, so that the total weight of the sample and the plate 11 is reduced. is measured and stored in a storage device.

When weighing is completed, the balance 8 and base 9 are lowered, the plate 11 is placed on the conveyor A, the conveyor A is then started, the cylinder 25 is opened, and the door 24 is raised, so the plate 11 enters the drying oven 20. However, when the plate 11 comes directly under the lifting frame 21 from which the plate 11 was suspended, the conveyor A stops and the cylinder 22
As a result, the lifting frame 21 descends, clamps both sides of the plate 11 with its clamp claws 23, and rises, lifting the plate 1.
The sample within 1 enters the dry state.

Thereafter, when the next sample input preparation signal is received from the previous stage device, the sample is loaded into another sample dish 11 in the same manner as the previous time.

In this way, the sample dishes 11 that have received the samples are placed into the drying oven 20 one after another, and the samples are dried.
Since the drying time after receiving item 1 is set,
When the set time has been reached, the lifting device B is disengaged and the sample plate 11 carrying the dried sample is placed on the conveyor A, the conveyor A is activated, the door 24 is opened, and the sample plate 11 is transferred onto the balance 8. then stop and door 2
4 is closed.

Next, the balance 8 and base 9 are raised to weigh the dried sample and the plate 11, and upon completion of the weighing, the balance 8 and base 9 are lowered to place the sample plate 11 on the conveyor A, and then the pusher 12 is activated. The plate 11 on the conveyor A is pushed out onto the rotary table 13 of the sample discharge device C which is waiting in a horizontal state.

Under the condition that the plate 11 is placed on the table 13, the clamp claw 16 clamps the plate 11, and then the drive device 15
is activated to rotate the rotary table 13 by 90 degrees together with the plate 11, and discharge the sample on the plate 11 to the chute 17. At the same time, air is jetted from the nozzle 19 to blow away the sample remaining on the plate 11.

After that, the rotary table 13 returns to the horizontal position, and the clamp claw 1
6 is opened and the pusher 18 is opened to return the empty sample pan 11 onto the conveyor A. The sample plate 11 returned onto the conveyor A in this way is moved by the electronic balance 8 to the plate 1.
Measure the weight of only 1 in the same way. Thereafter, it is returned to the drying oven 20 by the conveyor A and lifted up by the lifting device B, and is placed in a standby state.

On the other hand, the weight of the sample on the same sample plate 11 after drying + the weight of the plate 11 W ₂ is stored in the electronic computer that stores the sample on the sample plate 11 before drying + the weight of the plate 11 W ₁
When the weight W ₃ of only the plate 11 is input, W ₁ −W ₂ /W ₁ −W ₃ ×100=moisture % is calculated, and the moisture % of the sample is printed on a card or tape by an automatic printing machine. .

The operation of each of the above parts is controlled by position detection by a limit switch and signals from a timer.

In addition, as a pretreatment of samples to be supplied to the apparatus of the present invention, the amount of sample necessary for moisture measurement can be automatically separated from a large amount of samples by a fractionator and then introduced into the input chute 2. However, there are cases where a fixed amount of the sample is manually introduced into the chute 2, and a particle size measuring device can be connected next to the discharge chute 17 to use the sample for particle size measurement.

In this invention, after the sample is loaded into the input chute as described above, operations such as measuring, drying, and discharging the sample are all performed fully automatically.In particular, in the case of this invention, multiple By installing a sample plate lifting device and lifting the sample plate during drying, the conveyor underneath can run freely. Even while the sample is being loaded, conditioned, and weighed, the drying of the samples on other weighing pans is progressing in the drying oven, so the time required for loading the sample on the drying pan and weighing is longer than that required. Even when the time required for drying is quite long, one device of the present invention has the unique effect of being able to perform continuous and efficient moisture measurement without leaving the loading device or weighing device idle for a long time.

[Brief explanation of the drawing]

FIG. 1 is a partially vertical side view of the measuring device of the present invention, FIG. 2 is a plan view of the same, and FIG.
FIG. 4 is a longitudinal sectional front view taken along the lines of FIG. 1, and FIG. 5 is a side view of the sample discharge device. 2... Sample input chute, 6... Lifting platform, 8...
...Electronic balance, 11... Sample plate, 12, 18... Pusher, 17... Discharge chute, 20... Drying oven, A... Chain conveyor, B... Sample plate lifting device, C... Sample discharge device.

Claims (1)

[Claims] 1. Receive the sample on the sample plate, level it, and use a weighing machine to measure the total weight of the sample and sample plate before drying, the total weight of the sample and sample plate after drying, and the weight of only the sample plate. A moisture measuring device equipped with a calculator that measures and calculates the moisture percentage from these measured values includes a drying oven, a reversible conveyor that runs through the drying oven, and a conveyor that extends in front of the drying oven. The sample tray on the conveyor is lifted up so that it is directly below the sample input chute, and then lowered to place the sample tray loaded with the sample on the conveyor, and the sample tray that received the sample is placed in the drying oven. There is a weighing machine such as an electronic balance that measures the total weight of the sample and sample plate by pushing the sample plate onto the conveyor under the condition that the sample plate is stopped at the front, and a drying oven that receives multiple sample plates one after another into the drying oven after weighing. A plurality of sample plate lifting devices are used to lift the sample plate together with the sample on the conveyor, stop for a time set by a timer, and then descend to place the sample plate on the conveyor. A sample discharge device that pushes the sample plate placed on the conveyor to the side of the conveyor, discharges the sample on the sample plate to a discharge chute, and then pushes the sample plate back onto the conveyor; An automatic moisture measuring device consisting of a calculator that calculates the moisture percentage from the sample weight before drying, the sample weight after drying, and the weight of the sample plate.