JP5494990B2 - Automatic dissolution apparatus for dry assay samples - Google Patents

Description

The present invention relates to an automatic melting apparatus capable of continuously automatically melting a plurality of crucibles containing samples for dry assay. More specifically, the present invention provides a melting furnace that heats a crucible containing a sample for dry assay analysis, and a means for transferring the crucible into and out of the melting furnace. In particular, the present invention relates to a melting apparatus that can be charged into a melting furnace and automatically melted.

Various types of melting furnaces for heat-treating metal samples are conventionally known. For example, Patent Document 1 discloses a roller hearth type vacuum bypass furnace in which a conveying roller is provided in an elongated furnace and a water cooling jacket is provided on a roller bearing. Patent Document 2 discloses a furnace structure in which, for example, a furnace roller is provided with cooling means in a roller hearth heating furnace of a continuous casting facility. Patent Document 3 discloses a furnace structure that recovers the heat of exhaust gas to increase thermal efficiency in a rotary hearth furnace for producing reduced iron.

Japanese Patent No. 2860998 JP 2002-172453 A JP-A-11-222617

The conventional heating furnace has been attempted to reduce the heat load of the transport roller or increase the thermal efficiency, but all relate to the internal structure of the furnace, and the object to be processed is charged into the furnace, or the furnace There is no description about the means for taking out from the inside, and the technical configuration for continuously controlling a series of operations from charging of the workpiece into the furnace to heating in the furnace and taking out from the furnace is shown. It has not been.

The present invention solves the above-mentioned problems in the conventional heating furnace, and is provided with a melting furnace for heating the crucible, a transfer means in the furnace, and a means for putting the crucible in and out of the melting furnace. A series of operations from charging to heating and removal from the furnace can be performed continuously, and multiple crucibles are continuously charged into the melting furnace to automatically prepare samples for dry assay. An automatic dissolution apparatus that can be dissolved automatically is provided.

The present invention relates to an automatic melting apparatus for precious metal samples for dry assay , which has the following configuration.
[1] An automatic melting device that continuously performs dry assay analysis, and is equipped with a crucible for storing a precious metal sample for dry assay , a melting furnace for melting the sample in the crucible, and a crucible containing the sample in the melting furnace. The melting furnace has an annular shape, and is formed in an annular shape. The melting furnace has an annular shape that rotates freely, a means for rotating the furnace bottom, and an annular shape that covers the furnace bottom. Having a housing part forming a tunnel,
The arm device is provided with a rotatable arm and chuck means at the tip of the arm,
In the furnace of the annular tunnel, heating means are provided at regular intervals, and the furnace temperature is formed to be a plurality of temperature zones for heating the sample of the dry assay,
Automatic dissolution apparatus characterized by being charged into melting furnace crucible is taken out from the melting furnace the sample is heated and melted while passing through the furnace.
[2] The automatic melting apparatus according to the above [1], wherein the temperature zone in the furnace is controlled step by step to the heating conditions for melting the noble metal sample of the dry assay.
[3] Lead oxide, borax, and additives are charged into the crucible together with the sample powder for dry assay analysis, and the sample in the crucible is heated and melted while being transferred through the annular tunnel of the melting furnace. ] Or the automatic melting apparatus according to [2] above.
[4] The crucible containing the sample for the dry assay is held by the chuck means and is inserted into the melting furnace by rotating the arm, and the sample for the dry assay is taken while the crucible passes through the furnace. The automatic melting apparatus according to any one of [1] to [3], wherein the crucible that has been heated and melted and passed through the furnace is gripped by the chuck means and is taken out of the melting furnace by the rotation of the arm.

In the automatic melting system of the present invention, heating means are provided at regular intervals in the furnace of the annular tunnel, and the temperature in the furnace is formed into a plurality of temperature zones for heating the sample for dry assay. Since the sample of the dry assay is heated while the crucible is transferred through the furnace, the heating temperature cannot be uneven. Incidentally, in a melting furnace where the crucible is not transferred, heating unevenness in the furnace may occur, for example, the temperature becomes higher as it is closer to the heating element. On the other hand, since the heating of the melting furnace is uniform in the automatic melting apparatus of the present invention, the lead button is surely manufactured in the dry assay, and an accurate analysis result can be obtained.

In the automatic melting apparatus of the present invention, for example, lead oxide, borax, additives, and iron materials are put together with a sample powder for dry assay, and the sample for dry assay is dissolved while the crucible is transferred in the furnace. If the series of operations from crucible charging to heating and removal are continuously performed, gold can be analyzed efficiently by the ash blowing method.

In addition, the automatic melting apparatus of the present invention has a melting furnace for heating the crucible, a transfer means in the furnace, and a means for taking the crucible into and out of the melting furnace, so that a series of operations from charging the crucible to heating and taking out are performed. It can be performed continuously, and a plurality of crucibles can be continuously charged into a melting furnace and automatically melted. Therefore, it is possible to simplify the work of dissolving the dry assay sample and to greatly increase the work efficiency.

In the automatic melting apparatus of the present invention, for example, the melting furnace is formed in an annular shape, and one arm device is installed so that the carry-in port and the carry-out port are within the arm rotation range of the arm device. In addition, since the arm device can be used both as a crucible loading means and a take-out means, the device configuration is compact and can be installed in a limited work place, and a limited work space is effectively used. Can be used.

The automatic melting apparatus of the present invention includes, for example, a rotatable circular furnace bottom, a means for rotating the furnace bottom, an annular tunnel-shaped fixed housing covering the furnace bottom, and a means for heating the inside of the furnace And the crucible is transferred to the inside of the furnace by rotating the furnace bottom. According to this structure, the driving means is not installed in the furnace, so that the heat burden on the driving means is small and the durability is high. A good automatic dissolution system can be formed.

In the automatic melting apparatus of the present invention, the arm device can be formed by, for example, a vertical arm that can be rotated up and down, left and right, and a horizontal arm that is connected to the vertical arm, and the crucible loading step within the rotation range of the arm. By connecting the unloading process and the unloading process, a series of operations can be performed by a single arm device, and an efficient continuous automatic melting operation can be performed.

The automatic melting apparatus of the present invention, for example, continuously loads a plurality of crucibles containing a sample into the melting furnace at regular intervals by the arm device, and heats and melts the sample while the crucible passes through the furnace. The continuous automatic melting in which the crucible in which the sample is melted is successively taken out from the melting furnace in succession by the arm device can be performed.

Since the automatic dissolution apparatus of the present invention continuously dissolves the sample, the dissolution time does not become a waiting time, and the number of crucible treatments can be greatly increased. Specifically, it is possible to increase the number of processes from about 2300 crucibles to about 3300. Furthermore, since the automatic melting system of the present invention can automate all of the series of operations, it is possible to proceed with work without direct entry of personnel into the work environment for handling lead.

Hereinafter, the present invention will be specifically described based on embodiments shown in the drawings.
An example of the automatic dissolution apparatus of the present invention is shown in FIGS. In the apparatus configuration shown in the figure, a circular melting furnace 20 and an arm apparatus 30 for taking a crucible into and out of the melting furnace 20 are provided. A crucible carry-in portion 40 and a carry-out portion 41 are respectively installed around the arm device 30.

As shown in FIGS. 2 to 4, the melting furnace 20 includes a rotatable round furnace bottom 21 and a housing part 22 that forms an annular tunnel covering the furnace bottom 21. The furnace bottom 21 is formed of a circular pedestal 21A and a refractory furnace material 21B provided on the upper surface of the pedestal 21A. Further, means 21C for rotating the pedestal 21A is provided on the outer peripheral surface of the pedestal 21A. In the illustrated example, the chain of the rotating means 21C is wound around the outer periphery of the base 21A. The chain 21C is connected to driving means (not shown), and the pedestal 21A is rotated around the central axis by moving the chain 21C.

A housing portion 22 is provided on the upper portion of the furnace bottom portion 21. The housing portion 22 is fixedly supported by a support post 22F. The housing portion 22 forms an annular tunnel 22 </ b> A that covers the top of the furnace bottom portion 21. The lower end of the outer peripheral portion 22D of the housing portion 22 extends to the outside of the pedestal 21A, and a gap 22E is provided between the pedestal 21A and the housing portion 22. It is formed so that external air can flow into the furnace by natural convection through the gap 22E.

An annular tunnel 22A of the melting furnace 20 is lined with a refractory furnace material 22B, and heaters 22C are installed on the furnace inner wall at regular intervals. By adjusting the heating temperature of the heater 22C, the inside of the furnace of the annular tunnel 22A can be formed in a stepwise temperature block.

The melting furnace 20 is provided with a carry-in port 22G at the front position shown in FIGS. 2 to 3, and a position that is advanced by 3/4 from the carry-in port 22G through the annular furnace (at 270 degrees with respect to the carry-in port 22G). A carry-out port 22H is provided at the position).

An arm device 30 is installed in the vicinity of the melting furnace 20. The arm device 30 has a rotatable arm, and is arranged so that the carry-in port and the carry-out port of the melting furnace are located within the turn range of the arm. In the example of the apparatus shown in the figure, one arm device serving both as a charging means and a taking out means for the melting furnace 20 is installed in the vicinity of the carry-in port and the carry-out port.

The arm device 30 includes a pedestal 31, a vertical arm (referred to as a vertical arm) 32 on the pedestal 31, and a horizontal arm (referred to as a horizontal arm) connected to the tip of the vertical arm 32. 33). The vertical arm 32 is pivotally supported on the pedestal 31 by a plurality of bearing means, and is formed to be rotatable up and down and left and right. The horizontal arm 33 is rotatably connected to the tip of the vertical arm 32. Further, a chuck means 34 is pivotally supported at the tip of the lateral arm 33 so as to be rotatable. The chuck means 34 has a claw member 35 that can be freely opened and closed.

Around the arm device 30, a carry-in unit 40 is installed in the vicinity of the carry-in port 22G of the melting furnace 20, and a carry-out unit 41 is installed in the vicinity of the carry-out port 22H. A carriage 42 in which a large number of crucibles 43 are arranged is formed in the carry-in portion 40 and the carry-out 41 so as to go in and out.

In the above apparatus configuration, the vertical arm 32 and the horizontal arm 33 of the arm device 30 are rotated toward the carriage 32 of the carry-in section 40, and the crucible 43 of the carriage 42 is gripped by the chuck means 34 of the horizontal arm 33. The vertical arm 32 and the horizontal arm 33 are rotated toward the melting furnace 20, and the crucible 43 is charged into the furnace from the carry-in port 22G.

The crucible charged in the furnace is installed on the upper surface of the furnace material 21B forming the furnace bottom of the pedestal 21A, and the crucible is carried out through the furnace of the annular tunnel 22A by rotating the pedestal 21A by the chain 21C. It is transported toward 22H. Since the inside of the annular tunnel 22A is formed in a plurality of temperature zones in which the furnace temperature is controlled stepwise, the crucible is heated to an optimum temperature while being transferred through the annular tunnel furnace, and the sample inside the crucible is Is dissolved.

The crucible that has reached the carry-out port 22H is taken out of the furnace by the arm device. The vertical arm 32 and the horizontal arm 33 of the arm device rotate toward the carry-out port 22H, and the crucible of the carry-out port 22H is gripped by the chuck means 34. In this state, the vertical arm 32 and the horizontal arm 33 face the carry-out portion 41. The crucible 43 is placed on the carriage 42 that is rotated and is waiting at the carry-out portion 41.

According to the above apparatus configuration, a plurality of crucibles containing samples are continuously charged into the melting furnace at regular intervals by the arm device, and the samples are heated and melted while the crucible passes through the furnace. The melted crucible can be continuously taken out from the melting furnace sequentially by the above-mentioned arm device, and continuous melting can be performed.

Furthermore, in the above-mentioned continuous melting, lead oxide, borax, additives, and iron materials are put in the crucible charged in the melting furnace together with the sample powder for dry assay, and the sample is subjected to dry assay. Melting and dry analysis can be performed continuously. In this sample dissolution, when iron material is added to the sample, an electromagnet is provided on the chuck means attached to the arm tip of the arm device so that the iron material in the crucible is adsorbed to the electromagnet in the sample analysis by the iron nail method. Can be taken out automatically.

Moreover, the inside of the furnace can be divided into a plurality of temperature-controllable blocks, and the crucible heating conditions necessary for carrying out the dry assay can be controlled. Furthermore, by installing the entire automatic melting system under the hood of the exhaust draft, guiding the generated gas to the outside, cleaning it through a scrubber, etc., and removing it, it is possible to form a melting system with excellent working environment. .

Layout of automatic melting device of the present invention The top view of the melting furnace used for the automatic melting device of the present invention Front view of the melting furnace in FIG. Schematic partial cross-sectional view of the melting furnace of FIG. Schematic diagram of an arm device used in the automatic melting apparatus of the present invention Plan view of the arm device of FIG.

20-melting furnace, 21-furnace bottom, 21A-pedestal, 21B-furnace material, 21C-rotating means (chain), 22-housing part, 22A-annular tunnel, 22B-furnace material, 22C-heater, 22D-housing Lower end, 22E-gap, 22F-support, 22G-loading port, 22H-loading port, 30-arm device, 31-pedestal, 32-vertical arm, 33-horizontal arm, 34-chuck means, 40-loading unit, 41-unloading part, 42-cart, 43-crucible.

Claims (4)

It is an automatic melting device that continuously performs dry assay analysis, including a crucible for storing a precious metal sample for dry assay , a melting furnace for melting the sample in the crucible, a crucible containing the sample being charged into the melting furnace, or The melting furnace has an arm device to be taken out from the melting furnace, and the melting furnace is formed in an annular shape, and forms a rotatable circular furnace bottom, means for rotating the furnace bottom, and an annular tunnel covering the furnace bottom. A housing portion that
The arm device is provided with a rotatable arm and chuck means at the tip of the arm,
In the furnace of the annular tunnel, heating means are provided at regular intervals, and the furnace temperature is formed to be a plurality of temperature zones for heating the sample of the dry assay,
Automatic dissolution apparatus characterized by being charged into melting furnace crucible is taken out from the melting furnace the sample is heated and melted while passing through the furnace. The automatic melting apparatus according to claim 1, wherein the temperature zone in the furnace is controlled step by step to heating conditions for melting a noble metal sample for dry assay. The crucible is charged with lead oxide, borax, and additives together with sample powder for dry assay analysis, and the sample in the crucible is heated and melted while being transferred through the annular tunnel of the melting furnace. 2. The automatic dissolving apparatus described in 2. The crucible containing the sample for the dry assay is gripped by the chuck means and loaded into the melting furnace by the rotation of the arm, and the sample for the dry assay is heated and melted while the crucible passes through the furnace. The automatic melting apparatus according to any one of claims 1 to 3, wherein the crucible that has passed through the furnace is gripped by the chuck means and is taken out of the melting furnace by rotation of the arm.

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