JPH0445803A - Sludge removing device - Google Patents

Abstract

PURPOSE:To efficiently separate and remove sludge by providing an upper chamber having an inverted conical bottom with its inlet pipe opened at a position away from the center, a flow straightening pipe, a shell in which sludge is settled, a hopper forming the bottom of a removal tank, valves, a discharge pump and a lid. CONSTITUTION:A sludge-contg. liq. is supplied to the upper chamber 3 of a removal tank 1 from an inlet pipe 10, settled and allowed to flow down into a shell 5 through a flow straightening pipe 4. The fluid with the ascending speed reduced in the shell 5 is returned to a treating tank through an outlet pipe 11. The sludge is settled in this process, deposited in a hopper 6 and concentrated. The sludge is discharged into a sludge pan 17 by operating a valve 7 with a handle 9. The liq. temp. in the tank 1 and the temp. of the contact part of the outlet pipe 11 with the atmosphere are kept constant by a heating and temp. control means, and the pipe 10 is covered with an insulating material and kept warm. A liq. level gage having a detection alarm for the liq. level is furnished to the tank 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sludge removal device that is attached to various processing devices and removes sludge floating in the liquid of the processing device.

[Conventional technology]

In various treatments using molten salts, aqueous solutions or oils,
Sludge accumulates in the liquid over time during operation and becomes suspended in 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 processing quality of the material to be processed deteriorates due to the increase in sludge over time, a certain sludge removal cycle is determined with the aim of restoring the processing quality.

Conventionally, common methods for removing sludge include collecting and removing the sludge in the liquid using a metal net or ladle, filtering it with a filter, or installing a collection square dish ( This was done by sinking a sludge pan (sludge pan) onto which the sludge was allowed to settle and collecting it, or by attaching a removal tank to the treatment tank and periodically taking out the collected sludge.

[Problem that the invention seeks to solve]

However, in the conventional techniques described above, manual collection is time-consuming and removal is incomplete; when using a filter, the filter is easily clogged and cleaning or replacement is time-consuming; and when using a sludge pan, the removal is incomplete. In this case, the original operation must be interrupted during the sedimentation and separation of the sludge, and if the removal tank is attached to the treatment tank and the separated sludge is taken out periodically, it is necessary to manually take out the collected sludge. In addition, there are problems in that the effective space of the processing tank is reduced. Furthermore, these conventional techniques require manual labor, and in the case of a molten liquid exposed to high temperatures, the operator must perform dangerous work, which is undesirable from the standpoint of labor safety. However, in order to maintain good quality of treated materials after processing, it is necessary to implement these sludge removal methods, and the emergence of equipment that can efficiently separate and remove sludge without requiring human labor is awaited. The current situation is that

The present invention aims to solve these conventional problems and provide a sludge removal device that is more efficient than any conventional device without interrupting the operation of the device.

[Means for solving problems]

The above-mentioned problems are achieved by the sludge removal device according to the present invention.

That is, the present invention is installed in various processing devices, pumps up liquid containing sludge in these processing devices with pump means,
A sludge removal device for removing sludge in the tank, comprising an inflow pipe that supplies the tank from above into the tank and an outflow pipe that returns the liquid after sludge removal to the heat treatment device, the inflow pipe having a funnel shape. An upper chamber having an inverted conical bottom that opens at a position off the center of the bottom, a rectifier pipe attached downward from the center of the bottom of the upper chamber, a body in which sludge settles, and a bottom of the removal tank. The hopper is characterized by comprising an inverted conical hopper, a valve and a valve seat attached to the top of the lower end of the hopper, a sludge discharge pipe that is opened and closed by the valve and valve seat and opens to the outside air, and a lid. be.

According to a preferred embodiment of the invention, the stem of the valve is raised vertically upward from the valve to two parts above the lid, and a blockage removal rod is inserted through the stem and a hole provided through the center of the valve. A handle for opening and closing the valve passes through a cam groove bored in the guide tube and is fixed to the stem at right angles, and by rotating the handle horizontally, it is guided into the cam groove and opens the stem and valve together with the handle. The valve is configured to rotate and move up or down to open and close the valve.

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

[For production]

The sludge removal device of the present invention is constructed as described above, and its operation will be explained with reference to the attached drawings when this device is used to separate and remove sludge from liquid in a processing tank in which various treatments are performed. do.

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

The liquid targeted by the present invention refers to a molten liquid such as an inorganic mixed salt for general metal heat treatment, an aqueous solution such as a chemical conversion liquid, a plating liquid, or an oil such as cutting oil or quenching oil. For example, in the case of a molten liquid , the specific gravity in use is”. The objects to be removed are fine sludge and sludge with a specific gravity of 2.5 to 6, which are produced as a result of immersing metal parts in such a molten liquid and heating, carburizing, and nitriding. That is, in the process of removing sludge using this specific gravity difference, the flow velocity and passage time of the melt when it passes through the rectifier tube 4 and the settling section of the body section 5 are important factors. The passing speed is 1. m/mjn or less and the passing time is 10 seconds or more, the rectification effect is good, and the passing speed is 1 m/m,
If it exceeds in, a phenomenon occurs in which the concentrated sludge is rolled up in the concentrating section, and if the passing time is shorter than 10 seconds, the settling of the sludge in the settling section is disturbed, reducing the effect of settling force separation.

Even if the dimensional structure of the rectifier tube 4 satisfies the above conditions, the rising speed of the melt at the settling part is 0.06 m/mi.
It is preferable to simultaneously satisfy the two conditions of n or less and passage time of 5 minutes or more in order to achieve good sedimentation of the sludge.

Handle guide tube] Slanted cam groove 1 hollowed out in 4
When the handle 9 fixed perpendicularly to the stem 12 of the valve 7 through the cam groove 5 is operated in the horizontal direction, the handle 9 moves up or down along the slope of the cam groove 15. 12 and the valve 7 also move up or down while rotating, whereby the valve 7 opens and closes easily and reliably. By operating this valve, the sludge passes through the discharge pipe J3 and is drawn out into the sludge tray 7 provided below the discharge pipe opening.

If solid salt is precipitated in the sludge discharge pipe and the sludge cannot be discharged smoothly, the sludge clog removal rod 16 is inserted through the valve at the bottom of the tank and the hole drilled in the center of its stem. It can be moved up and down to remove solid vines l-.

In the case of molten liquid, what is the temperature of the liquid in the sludge removal tank, the installed heating and temperature? The furnace 2 having section A means is maintained at a constant temperature equal to or greater than the temperature of the heat treatment melt bath. In addition, the air contact portion of the inflow pipe 10 is coated and kept warm with a heat insulating material, and the air contact portion of the outflow pipe 11 is coated with heating and temperature control means to keep the temperature of the flowing melt constant.
Cooling prevents vines I from precipitating and clogging the pipes. In addition, there is an abnormality in the liquid level in the sludge removal tank to prevent the inflow liquid from being drawn in the event of a blockage of the outflow pipe.
A thermocouple 19 or a liquid level gauge should be provided as a sensor to detect and alarm the second rise.

Note that if this device is placed on a cart 18 that is movable with casters or the like, one sludge removing device can remove sludge from a plurality of treatment tanks.

The sludge removal equipment described above can be operated without interfering with the original operation of the treatment tank]2.Everything other than the sludge discharge operation is completely automatic, and parts that require human power are also programmed with automation mechanisms added. By doing so, it is possible to easily fully automate the process.

〔Example〕

Table 1 shows a comparison of the results when the apparatus of the present invention is used to remove sludge from a salt bath nitrocarburizing tank and when the conventional sludge pan method is used.

When the apparatus of the present invention was used, a Nearlift I pump was used as a means for pumping up the molten liquid containing sludge from the salt bath nitrocarburizing tank to the sludge removal tank.

(Margins below) In the device of the present invention, in the case of the dimensions of the embodiment shown in the table,
The flow rate of pumped salt into the removal tank is 72 to 180 Q.
/H, and the sedimentation and separation of the sludge was good.

The flow rate of the melt passing through the rectifier tube at this time is 0.35 to 0.
．． 88m/min, passing time is 29~12sec,
The velocity of the melt rising through the settling section is 0.019 to 0.04
The speed was 9 m/min, and the passing time was 15.7 to 6.2 m1n.

Comparing the results in Table 1, under the implementation shown in the table,
Compared to the sludge pan method, the sludge removal effect of the present invention is
In addition, the conventional method requires a two-hour stoppage compared to the operating time of the heat treatment tank, but the apparatus of the present invention requires a stoppage time of 0, significantly improving production efficiency.

〔effect〕

According to the present invention as described above, the sludge in the liquid seal can be separated and removed more efficiently than any conventional device without interfering with the operation of the treatment tank at all. Additionally, the effort required to operate the device is less than any conventional device.

In addition, the five devices have improved occupational safety issues,
Stable quality can be obtained. Furthermore, by adding an automation mechanism to the operation of the sludge discharge valve, etc., it is possible to easily make the system unmanned.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical cross-sectional view showing a partially transparent view of an apparatus for removing sludge in a melt according to the present invention. 1...Sludge removal tank 3...Upper chamber 5...Body part 7...Valve 9...Handle 11...Outflow pipe 13...Discharge pipe 15/Cam groove 17...Sludge The receiver is a plate 19...thermocouple 2...warming furnace 4...straightening tube 6...hopper 8...valve seat 10...inflow pipe 12...stem 14...guide pipe 16.・Clog removal rod 18 ・Dolly 20 ・Hearth lid

Claims (1)

[Scope of Claims] 1. An inflow pipe that is attached to various processing equipment, pumps up the liquid containing sludge in the processing equipment and supplies it into the tank from above the tank, and the liquid after the sludge is removed is used for the above-mentioned processing. A sludge removal device for removing sludge in a tank, comprising an outflow pipe that returns to the device, the upper chamber having an inverted conical bottom with the inflow pipe opening at a position off the center of the funnel-shaped bottom; A rectifier pipe attached downward from the center of the bottom of the upper chamber, a body section where sludge settles, an inverted conical hopper forming the bottom of the removal tank, and a valve attached to the top of the lower end of the hopper. A sludge removal device comprising a seat, a valve and a sludge discharge pipe opened and closed to the outside air by the valve seat, and a lid. 2. The stem of the valve is raised vertically upward from the valve to the top of the lid, and a blockage removal rod is disposed through a hole made through the stem and the center of the valve, and a handle for opening and closing the valve is provided. passes through a cam groove bored in the guide tube and is fixed to the stem at right angles, and when the handle is rotated horizontally, it is guided to the cam groove and the stem and valve are rotated together with the handle and raised or lowered, The sludge removal device according to claim 1, wherein the sludge removal device is configured to open and close a valve. 3. The sludge removal device according to claim 1 or 2, wherein the device is mounted on a movable trolley.