JPH08176654A - Device for removing sludge in fused salt bath liquid - Google Patents

Abstract

PURPOSE: To effectively, utilize the space in a fused salt bath tank and to surely and efficiently remove sludge. CONSTITUTION: This sludge removing device has a jig body 18, first to fourth tubular bodies 20, 22, 24, 26 for ladling up the fused salt bath liquid built in the jig body 18, a compressed air supplying means 28 for ladling up the fused salt bath liquid 16 by supplying compressed air to these first to fourth tubular bodies 20 to 26 via a pump installed outside the fused salt bath tank 14 and a sludge capturing means 30 for removing the sludge in the fused salt bath liquid 16 ladled up by the first to the fourth tubular bodies 20 to 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing sludge in a molten salt bath liquid for removing sludge mixed in the molten salt bath liquid.

[0002]

2. Description of the Related Art For example, a salt bath soft nitriding apparatus is used as an apparatus for surface-hardening iron-based metal parts such as crank shafts which are automobile parts. This salt bath nitrocarburizing device is configured to apply a surface hardening treatment to an iron-based metal part by immersing the iron-based metal part in a salt bath solution obtained by heating and melting a salt bath agent at a predetermined temperature. ing.

In this case, along with the above-mentioned surface hardening treatment, the amount of sludge mixed in the molten salt bath solution increases with time, which causes deterioration of the treatment quality of the iron-based metal parts as the material to be treated. I will end up. For this reason, various methods have been conventionally used to remove sludge in the molten salt bath liquid. For example, as disclosed in JP-A-56-127176, the molten salt in the molten salt bath is disclosed. The bath liquid is circulated by a pump or the like into a separation container provided outside the molten salt bath, and the sludge is separated by a lump-shaped sludge collecting member of fibrous fine wires arranged inside the separation container, and the sludge is collected. A method of integrally discarding a member and the sludge is known.

[0004]

However, in the above-mentioned prior art, a pump or a pipe dedicated to pumping the molten salt bath liquid must be installed in the molten salt bath. Therefore, in the molten salt bath, in addition to a jig space for holding the material to be treated and being immersed in the molten salt bath liquid, a space for installing a pump or a pipe is required. It has been pointed out that there is a problem that the whole becomes large and inefficient.

The present invention is intended to solve this type of problem, and aims to make effective use of the space in the molten salt bath and to reliably and efficiently remove sludge from the molten salt bath liquid. An object of the present invention is to provide an inside sludge removing device.

[0006]

In order to achieve the above-mentioned object, the present invention provides a jig body arranged in a molten salt bath liquid in a molten salt bath, and a jig body internally provided in the jig body. A plurality of pipes for pumping up the molten salt bath liquid, one end of which is opened by changing the height position of each other in the molten salt bath liquid and the other end of which is opened to the outside, and outside the molten salt bath By supplying compressed air to one end of each pipe through a pump provided, compressed air supply means for pumping up the molten salt bath liquid to the other end of the pipe, and each of the pipes. Sludge collecting means for removing sludge in the pumped molten salt bath liquid, which is disposed below the other end.

[0007]

In the sludge removing apparatus for molten salt bath liquid according to the present invention, the jig body is internally provided with a plurality of pipes for pumping the molten salt bath liquid. For this reason, in the molten salt bath, a space for arranging a dedicated pipe, a pump, etc. other than the jig body is not required, and the inside of the molten salt bath can be effectively utilized.

In addition, a plurality of pipes are arranged, and one end of each pipe is opened in the molten salt bath liquid by changing the height positions thereof. For this reason, it becomes possible to efficiently pump up the sludge floating in the molten salt bath liquid at different height positions due to the difference in mass in a short time.

[0009]

EXAMPLES Examples of a sludge removing device for molten salt bath according to the present invention will be described in detail below with reference to the accompanying drawings.

1 and 2, reference numeral 10
Shows a sludge removing device according to the present embodiment. The sludge removing device 10 is provided with a molten salt bath liquid 1 in a molten salt bath 14.
The jig main body 18 which is arranged in 6 and can hold the material 12 to be treated freely.
And inside the jig body 18, one end 20 of each
First to fourth pipes for pumping the molten salt bath liquid in which a to 26a are opened in the molten salt bath liquid 16 by changing their height positions and the other ends 20b to 26b are opened to the outside. Compressed air is supplied to one ends 20a to 26a of the first to fourth pipe bodies 20 to 26 via 20, 22, 24, 26 and a pump (not shown) provided outside the molten salt bath 14. As a result, compressed air supply means 28 for pumping up the molten salt bath liquid 16 to the other ends 20b to 26b of the first to fourth pipe bodies 20 to 26, and the first to fourth pipe bodies 20 to 26. Sludge collecting means 30 for removing sludge in the molten salt bath liquid 16 pumped up, which is disposed below the other ends 20b to 26b.

The molten salt bath 14 is provided with a tank body 32 made of a corrosion-resistant alloy, for example, Inconel, and the tank body 32 is filled with the molten salt bath liquid 16. The molten salt bath liquid 16 contains necessary molten salt bath liquid 16. Accordingly, one end of the stirring air supply pipe 34 is immersed along the bottom of the molten salt bath 14. A plurality of holes 36 are formed at one end of the stirring air supply pipe 34, and a stirring air supply source (not shown) is connected to the other end of the stirring air supply pipe 34.

As shown in FIG. 2, the jig body 18 has a cylindrical frame body 38, and the frame body 38 holds a plurality of pairs of holding members for holding the material 12 to be processed. Rod 4
0 and 40 are provided radially. A suspending portion 42 is formed in the central portion of the frame 38 so as to project upward (see FIG. 1).
reference).

The first to fourth tubular bodies 20 to 26 are frame bodies 38.
Are held at equal angular intervals (90 °) on the upper part of. One end 20a of the first pipe body 20 penetrates the lower portion of the frame body 38 and opens near the bottom of the tank body 32, and one end 22a of the second pipe body 22 opens inside the frame body 38. There is.
The one end 24 a of the third tubular body 24 is connected to the one end 22 of the second tubular body 22.
is opened above a, and one end 26a of the fourth tubular body 26 is further opened.
Is open above one end 24a of the third tubular body 24.

The compressed air supply means 28 has a connecting portion 44a whose one end is connected to an external pump (not shown).
To 50a are provided, and the other ends of the first to fourth supply pipes 44, 46, 48, 50 are opened toward the one ends 20a to 26a of the first to fourth pipe bodies 20 to 26, respectively. The first to fourth supply pipes 44 to 50 are fixed to the upper portion of the frame body 38 in parallel with the first to fourth pipe bodies 20 to 26, and the other ends thereof are curved upward from below. The first to fourth tubular bodies 20 to 26 are opened so as to face one ends 20a to 26a.

The other end 20b of the first to fourth pipe bodies 20 to 26
The first to fourth sludge collection containers, which are open downward on the upper side of the tank body 32 and form the sludge collection means 30 on the upper side of the frame body 38, are located on the lower side of the tank bodies 32 to 26b. 52, 54, 56 and 58 are provided. The first to fourth sludge collecting containers 52 to 58 are made of a material such as a steel plate, Inconel, or titanium having excellent heat resistance and chemical resistance.

The first sludge collection container 52 has a relatively large opening area in order to pump up sludge having a relatively large mass floating near the bottom of the tank 32 through the first tube 20. A mesh 60 is provided. The second sludge collection container 54 is provided with a fine mesh 62 for pumping sludge having a mass smaller than that of the first pipe 20 by the second pipe 22. The third sludge collection container 56 is provided with minute holes 64 for pumping sludge having a smaller mass through the third pipe body 24. In order to pump up a small amount of sludge into the fourth sludge collection container 58 via the fourth pipe body 26,
A fine hole portion 64 is provided, and a honeycomb-shaped filter member 66 made of cordierite ceramics or mullite ceramics is arranged inside thereof.

Next, the operation of the sludge removing device 10 thus constructed will be described.

A molten salt bath liquid 16 is obtained by heating the salt bath agent in the molten salt bath 14 to a predetermined temperature. Then, the jig main body 18 holding a plurality of materials 12 to be processed is dipped in the molten salt bath liquid 16 for a predetermined time so that the surface hardening treatment of the materials 12 to be processed, that is, nitriding treatment is performed. It At that time, if the stirring air is supplied to the stirring air supply pipe 34 through a stirring air supply source (not shown) as needed, the stirring air is discharged into the molten salt bath liquid 16 from the plurality of holes 36. The molten salt bath liquid 16 is stirred.

When the nitriding treatment is continued, the amount of sludge mixed in the molten salt bath liquid 16 increases with time, and this sludge is collected by the sludge collecting means 30.
That is, when compressed air is supplied to the first to fourth supply pipes 44 to 50 under the action of a pump (not shown) arranged outside, the compressed air is supplied to the first to fourth supply pipes 44 to 50.
From the other end of 50 to one end 20 of the first to fourth tubular bodies 20 to 26
a to 26a (see arrow in FIG. 1).
Therefore, the molten salt bath liquid 16 has one end 20a-
26a is introduced into the first to fourth tubular bodies 20 to 26,
The other ends 20b to 26b passing through the first to fourth pipe bodies 20 to 26 are supplied to the first to fourth sludge collecting containers 52 to 58 constituting the sludge collecting means 30.

At this time, the sludge in the molten salt bath liquid 16 is
It floats in the tank 32, and the floating height in the tank 32 changes due to the difference in the mass of the sludge. That is, the sludge having a large mass stays on the bottom side of the tank 32, while the sludge having a small mass floats on the upper side of the tank 32.

Therefore, the sludge having a relatively large mass floating near the bottom of the tank 32 is pumped up through the first pipe 20 and supplied to the first sludge collecting container 52. When the molten salt bath liquid 16 passes through the mesh 60 having a relatively large opening area of the first sludge collection container 52, the sludge having the relatively large mass is mixed with the first sludge.
It is accumulated in the sludge collection container 52.

Further, the sludge having a small mass in the molten salt bath liquid 16 is placed at a predetermined height in each second sludge.
And the second pipe pumped by the third pipe body 22, 24
And is supplied to the third sludge collecting containers 54 and 56, blocked by the fine mesh 62 and the fine hole portions 64, and deposited on the second and third sludge collecting containers 54 and 56. Further, the sludge having a minute mass floating on the upper side of the tank body 32 is pumped up by the fourth pipe body 26 and is discharged to the fourth side.
It is supplied to the sludge collection container 58 and removed through the plurality of filter members 66. Therefore, the sludge of various sizes mixed in the molten salt bath liquid 16 can be reliably collected by the sludge collecting means 30.

Here, since the filter member 66 has a honeycomb shape, the sludge collecting property is secured, and the salt of the salt bath base easily passes through the filter member 66. Does not remain. In particular, since the filter member 66 is made of porous cordierite ceramics or mullite ceramics, the sludge adsorbability is improved and the sludge can be reliably collected.

Next, when the sludge collecting means 30 is washed, the first to fourth sludge collecting containers 52 to 58 are
After being taken out from the jig main body 18, it is placed in an ultrasonic cleaning device or the like (not shown) and a predetermined cleaning operation is performed.

In this case, in this embodiment, the first to fourth pipe bodies 20 to 26 for drawing up the molten salt bath liquid 16 into the sludge collecting means 30 placed on the jig body 18 are the jigs. First to fourth supply pipes 44 to 50, which are installed in the main body 18 and are connectable to a pump (not shown) arranged outside the molten salt bath 14, are fixed to the jig main body 18. . Therefore, a space for arranging a pump, a dedicated pipe, or the like in the molten salt bath 14 is unnecessary, the space in the molten salt bath 14 can be effectively utilized, and the entire molten salt bath 14 can be effectively reduced in size. Can be converted. As a result, the effect of easily improving the efficiency of the salt bath processing operation of the material 12 to be processed can be obtained. Moreover,
The jig body 18 is not a collection mechanism dedicated to the tank body 32,
It can be applied to various forms of molten salt baths 14 and has an advantage of excellent versatility.

Further, in this embodiment, a plurality of (for example, four) first to fourth pipe bodies 20 to 26 are arranged in the tank body 32, and one ends 20a to 26a of the respective pipes are molten salt baths. The liquids 16 are opened by changing their height positions. Therefore, sludge floating in the tank 32 can be simultaneously pumped up by the first to fourth pipe bodies 20 to 26, and the sludge collecting operation can be easily performed.

Moreover, the sludge in the molten salt bath liquid 16 is
Due to the difference in mass, the sludge floats at different height positions in the tank body 32, and these sludges are accumulated in the first to fourth pipe bodies 20.
The first to fourth sludge collecting containers 52 to 58 corresponding to the respective sizes are selectively supplied through one end 20a to 26a having different heights. Therefore, it is possible to obtain the effect that the sludge collecting operation can be performed more efficiently and reliably.

In this embodiment, the first to fourth sludge collecting containers 52 to 58 are provided, but the number can be increased or decreased as necessary. In addition, the fourth sludge collection container 5
Although the filter member 66 is arranged only in No. 8, this kind of filter member can be arranged in all the collection containers 52 to 58.

Further, in the present embodiment, the molten salt bath liquid 1 in the tank body 32 is held with the material to be treated 12 held in the jig body 18.
Although the work of removing sludge from 6 is performed, the jig body 18 may be used without holding the material 12 to be processed. Furthermore, as shown in FIG. 3, it is possible to use a sludge removing device 10a dedicated to sludge removing processing, which is provided with a jig body 18a that does not have a function of holding the material 12 to be processed. The same components as those of the sludge removing device 10 are designated by the same reference numerals.

[0030]

EFFECTS OF THE INVENTION According to the sludge removing device for molten salt bath liquid of the present invention, the following effects and advantages are obtained.

The jig body is internally provided with a plurality of pipes for pumping the molten salt bath liquid. Therefore, in the molten salt bath,
In addition to the jig body, a space for arranging a dedicated pipe, a pump, or the like becomes unnecessary, and the inside of the molten salt bath can be effectively used.

Moreover, a plurality of pipes are arranged, and one end of each pipe is opened in the molten salt bath liquid by changing the height position thereof. For this reason, it becomes possible to efficiently pump up the sludge floating in the molten salt bath liquid at different height positions due to the difference in mass in a short time.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a schematic configuration of a sludge removing device in a molten salt bath liquid according to an embodiment of the present invention.

FIG. 2 is a schematic plan view of the sludge removing device.

FIG. 3 is a vertical cross-sectional view showing a schematic configuration of a sludge removing device that does not hold a material to be treated.

[Explanation of symbols]

10, 10a ... Sludge removing device 12 ... Material to be treated 14 ... Molten salt bath 16 ... Molten salt bath liquid 18, 18a ... Jig body 20, 22, 2
4, 26 ... Tube body 28 ... Compressed air supply means 30 ... Sludge collection means 32 ... Tank body 38 ... Frame body 44, 46, 48, 50 ... Supply pipes 52, 54, 56, 58 ... Sludge collection container 66 ... Filter member

Claims (2)

[Claims] 1. A jig main body arranged in a molten salt bath liquid in a molten salt bath; and an interior of the jig main body, wherein one end of each jig changes its height position in the molten salt bath liquid. And a plurality of pipes for pumping the molten salt bath liquid which are opened at the other ends of the respective pipes, and compressed air is supplied to one end of each pipe via a pump provided outside the molten salt bath. By supplying compressed air to the other end side of the pipe body for pumping up the molten salt bath liquid, and below the other end of each pipe body, in the pumped up molten salt bath liquid A sludge collecting device for removing sludge from the molten salt bath liquid, comprising: 2. The sludge removing device according to claim 1, wherein the sludge collecting means is disposed below the other end of each of the pipe bodies, and the sludge collecting means is adapted to change in height position of one end of each of the pipe bodies. An apparatus for removing sludge in a molten salt bath liquid, comprising a plurality of collecting members having different opening areas.