JPH0647043B2 - Sludge removal device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sludge removing device which is installed in combination with various processing devices and removes sludge suspended and mixed in a liquid of the processing device.

[Conventional technology]

In various treatments using molten salt, aqueous solution or oil,
During operation, sludge accumulates in the liquid over time and floats into the liquid. This sludge removal has been a matter of great concern in order to sufficiently enhance the treatment effect of the treated material and to maintain good quality after treatment. That is,
Since the treatment quality of the material to be treated deteriorates due to the increase in sludge with time, the sludge cycle is fixedly determined for the purpose of recovering the treatment quality.

Conventionally, the generally used sludge removing means is to collect and remove sludge in the liquid with a metal net or ladle, or to filter with a filter, or to collect at the bottom of the treatment tank a collecting tray ( The sludge pan) was submerged and the sludge was allowed to settle on the sludge to collect the sludge. Alternatively, a removal tank was attached to the treatment tank and the collected sludge was periodically taken out.

[Problems to be solved by the invention]

However, in the prior art as described above, manual collection takes time and incomplete removal, and when a filter is used, the filter is easily clogged and it takes time to clean or replace it. In this case, the original operation must be interrupted during the sludge settling separation, and further, in the case of a device that attaches a removal tank to the treatment tank and periodically takes out the separated sludge, it takes manpower to take out the collected sludge. In addition, there is a problem that the effective space of the processing tank is reduced. Further, in these conventional techniques, in the case of a molten liquid which requires human power and is exposed to high temperature, the operator must perform dangerous work, which is not preferable from the viewpoint of occupational safety. However, these sludge removal methods have been forced to be carried out in order to maintain good quality of treated materials, and the emergence of an apparatus capable of efficiently separating and removing sludge without human labor is awaited. It is in the present condition.

SUMMARY OF THE INVENTION It is an object of the present invention to solve these conventional problems and to provide a sludge removing device that is more efficient than any conventional device without interrupting the operation of the device.

[Means for solving problems]

The above problems can be achieved by the sludge removing device according to the present invention.

That is, the present invention is provided in parallel with various processing apparatuses, and a liquid containing sludge in the processing apparatus is pumped by a pump means, and an inflow pipe for supplying into the tank from above the tank and a liquid after sludge removal are refluxed to the heat treatment apparatus. A sludge removing device for removing sludge in a tank, the upper chamber having an inverted conical bottom opening at a position deviating from the center of the funnel-shaped bottom, and the upper chamber. A rectifying pipe installed downward from the bottom center, a body part where sludge settles, an inverted conical hopper that forms the bottom part of the removal tank, a valve and a valve seat attached to the lower end apex of the hopper, A sludge discharge pipe that is opened and closed by a valve and a valve seat and opens to the outside air, a lid, a stem that is erected vertically upward from the valve to a position above the lid, and penetrates through the center of the stem and the valve. Hole Comprising a disposed a jam removal rod through, and is characterized in that it is arranged inside the thermal insulation vessel.

According to a preferred aspect of the present invention, the handle for opening and closing the valve is fixed to the stem at a right angle through the cam groove formed in the guide tube, and is guided to the cam groove by rotating the handle horizontally. With the handle, the stem and the valve are raised and lowered while rotating to open and close the valve.

According to another aspect of the invention, the device is mounted on a movable carriage.

[Work]

The sludge removing apparatus of the present invention as described above is configured as described above, and the operation of separating and removing sludge from the liquid in the processing tank for performing various processes using this apparatus will be described with reference to the accompanying drawings. To do.

First, the liquid containing sludge that has settled to the bottom of the treatment tank is continuously pumped up by an appropriate pumping pump means such as an air lift pump, and passes through the inflow pipe 10 of the removal tank 1 connected to the discharge pipe of the removal tank. The liquid is supplied below the liquid surface of the upper chamber 3, and the liquid is calmed in the upper chamber 3, descends through the flow straightening pipe 4, and enters the lower body portion 5. Due to the expansion of the flow path cross section of the lower body portion 5, the liquid is remarkably reduced in rising speed and is returned to the processing tank through the outflow pipe 11. In this process, the sludge contained in the liquid settles and precipitates and concentrates at the bottom of the inverted conical bottom, and the sludge in the reflux liquid is removed.

The liquid targeted by the present invention refers to a melt such as an inorganic mixed salt for general metal heat treatment, a chemical conversion treatment solution, an aqueous solution such as a plating solution or cutting oil, an oil such as a quenching oil. The specific gravity during use is about 1.4 to 2, and the object to be removed is fine sludge and sludge with a specific gravity of 2.5 to 6 generated as a result of immersion heating, carburizing and nitriding of metal parts in such a melt. Becomes That is, in the process of removing sludge using this difference in specific gravity, the molten liquid is rectified by the rectifying pipe 4.
Also, the flow velocity and passage time when passing through the sinking portion of the body portion 5 are important factors. In the rectifying tube 4, the passage speed is 1 m / min or less, and when the passage time is 10 seconds or more, the rectification effect is Well, if the passing speed exceeds 1 m / min, the phenomenon of rolling up the sludge concentrated in the thickening part occurs, and if the passing time is shorter than 10 seconds, it disturbs the sedimentation of the sludge in the sedimentation part and reduces the effect of sedimentation separation. .

Even when the rectifying tube 4 has a dimensional structure satisfying the above conditions, it is necessary to simultaneously satisfy the two conditions that the rising speed of the melt in the sedimentation part is 0.06 m / min or less and the passage time is 5 minutes or more. Preferred to provide good settling.

When the handle 9 fixed at a right angle to the stem 12 of the valve 7 is horizontally operated through the inclined cam groove 15 bored in the handle guide tube 14, the handle 9 moves up or down along the inclination of the cam groove 15. As a result, the stem 12 and the valve 7 which are integrated with the handle 9 are also raised or lowered while rotating, whereby the valve 7 is easily and reliably opened and closed. By this valve operation, the sludge passes through the discharge pipe 13 and is withdrawn to the sludge tray 17 provided below the discharge pipe opening.

When sludge is not discharged smoothly due to solid salt depositing in the sludge discharge pipe, use the hole drilled in the center of the valve and its stem at the bottom of the tank to move the sludge clogging removal rod 16 that is inserted through And the solid salt can be removed.

In the case of the molten liquid, the liquid temperature of the sludge removing tank is maintained at a constant temperature equal to or higher than the in-tank temperature of various processing devices by the furnace 2 having the heating and temperature adjusting means provided, and thus the liquid temperature after sludge removal is maintained. As much as possible to reduce the liquid temperature,
It can be refluxed to various processing devices. In addition, the inflow pipe 10
The atmosphere contacting part of the is kept warm by a heat insulating material, and the atmosphere contacting part of the outflow pipe 11 is controlled to have a constant temperature of the melt flowing out by a coating having heating and temperature adjusting means, and a salt is deposited by cooling to form a pipeline. Prevent blockage. Further, the sludge removal tank is provided with a thermocouple 19 or a liquid level gauge as a sensor for detecting and alarming an abnormal rise in the liquid level in order to prevent overflow of the inflow liquid due to an accidental blockage of the outflow pipe.

This device is a cart that can be moved by casters, etc.
If it is mounted on 18, the sludge removing device can also remove sludge from a plurality of treatment tanks.

The sludge removal device described above can be operated without disturbing the operation of the original processing tank at all, and it is completely automatic except for sludge discharge operation, and the part that requires human power is also programmed by adding an automation mechanism. Therefore, it is possible to easily fully automate the process.

〔Example〕

Table 1 shows a comparison between the results of using the device of the present invention for removing sludge in the salt bath nitrocarburizing tank and using the sludge pan method that has been conventionally performed.

When the apparatus of the present invention was used, an air lift pump was used as the means for drawing up the melt containing sludge from the salt bath nitrocarburizing tank to the sludge removing tank.

In the device of the present invention, in the case of the dimensions of the embodiment shown in the table,
The inflow speed of the pumped salt into the removal tank was carried out within the range of 72 to 180 / H, and the sedimentation and separation of sludge was good.

At this time, the flow rate of the molten liquid passing through the straightening pipe is 0.35 to 0.88 m.
/ Min, transit time is 29 to 12 sec, the speed of the melt rising in the sedimentation part is 0.019 to 0.049 m / min, transit time is 15.7 to 6.2
It was min.

Comparing the results in Table 1, under the embodiments shown in the table,
Compared to the sludge pan method, the slag removal effect according to the present invention is
In addition to the improvement of about 22%, the conventional method inevitably stops for 2 hours with respect to the operating time of the heat treatment tank, but in the apparatus of the present invention, the stopping time is 0, which significantly improves the production efficiency.

[Effect]

According to the present invention as described above, the sludge in the liquid can be separated and removed more efficiently and with less heat loss than any conventional device without obstructing the operation of the treatment tank. Also, the labor required to operate this device may be less than that of any conventional device.

In addition, the device improves occupational safety issues,
Stable quality can be obtained. In addition, if an automated mechanism is added to the operation of the sludge discharge valve, it can be easily unmanned.

[Brief description of drawings]

FIG. 1 is a schematic vertical cross-sectional view partially showing a sludge removing device for molten metal according to the present invention in a perspective view. 1 ... Sludge removal tank, 2 ... Insulating furnace 3 ... Upper chamber, 4 ... Rectifying tube 5 ... Body, 6 ... Hopper 7 ... Valve, 8 ... Valve seat 9 ... Handle, 10 ... … Inflow pipe 11 …… outflow pipe, 12 …… stem 13 …… outflow pipe, 14 …… guide pipe 15 …… cam groove, 16 …… clogging removal rod 17 …… sludge tray, 18 …… carriage 19 …… thermoelectric Pair, 20 …… Furnace cover

Claims (3)

[Claims] 1. A processing apparatus is provided in parallel, and a liquid containing sludge in the processing apparatus is pumped up by a pump means, and an inflow pipe for supplying from the upper part of the tank into the tank and the liquid after sludge removal are refluxed to the processing apparatus. A sludge removing device having an outflow pipe for removing sludge in a tank, wherein the inflow pipe has an inverted conical bottom opening at a position off the center of the funnel-shaped bottom, and the upper chamber bottom. A straightening pipe installed from the center downward, a body part where sludge settles, an inverted conical hopper that forms the bottom part of the removal tank, a valve and a valve seat installed on the top of the lower end of the hopper, and a valve. And a sludge discharge pipe which is opened and closed by a valve seat and opens to the outside air, a lid, a stem which is erected vertically upward from the valve and above the lid, and which penetrates through the center of the stem and the valve. Through the hole Comprising a disposed a jam removal rod
The sludge removing device is characterized in that it is arranged in a heat insulation tank. 2. A handle for opening and closing the valve penetrates a cam groove formed in a guide tube and is fixed at a right angle to a stem, and is guided to the cam groove by rotating the handle in a horizontal direction together with the handle. The sludge removing device according to claim 1, wherein the stem and the valve are configured to rotate to move up and down to open and close the valve. 3. The sludge removing device according to claim 1, wherein the device is mounted on a movable carriage.