JPH02225617A - Hardening device - Google Patents

Abstract

PURPOSE:To rapidly cool a metallic product with which heating is completed in a short period of time by hanging the metallic product which is heated to a high temp. in a heating furnace to a transporting base and feeding the product into a cooling chamber positioned right below the heating furnace. CONSTITUTION:Opening/closing doors 6R, 6L of the heating furnace 1 are opened and a lifting chain 11 is lowered down to a prescribed position. Both the left and right positions of the transporting base 2 hanging the metallic product W in a feeding/ejecting zone Z is guided and supported to a lifting stand 13 where the chain 11 is engaged with the front end of the transporting base 2. The chain 11 is then pulled up and the metallic product W which is held hung to the transporting base 2 is housed into the heating furnace 1. The opening/closing doors 6R, 6L are closed and the product is heated to a high temp. by a heater H. The opening/closing doors 6R, 6L are opened and the chain 11 is lowered to feed the metallic product W into the cooling liquid in the cooling chamber 3 upon completion of the heat treatment. The metallic product W is subjected to the hardening treatment in this way in an extremely short period of time by the extremely simple operation and the hardening quality is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a quenching apparatus that rapidly cools a metal product heated to a high temperature in a heating furnace by immersing it in a cooling liquid in a cooling tank.

[Conventional technology]

As shown in FIG. 5, in the conventional hardening apparatus, the heating furnace 5 is opened by opening an opening/closing door 52 at the entrance and exit provided at the front of the heating furnace 51.
A metal product W pulled out horizontally from inside the cooling tank 53 is placed on a lifting platform 54 disposed inside the cooling tank 53.
A common method is to place the device on a lift cage (not shown) suspended from above and drop it into a cooling liquid (Utility Model Publication No. 183257/1983, Japanese Patent Publication No. 23055/1983).

(Refer to Utility Model Publication No. 63-6202 and Utility Model Publication No. 63-19312).

[Problem to be solved by the invention]

By the way, in order to improve the quality of hardening, the heated metal product W must be rapidly cooled in as short a time as possible.

However, in the conventional general method, before the metal product W heated to a high temperature in the heating furnace 51 is immersed in the cooling tank 53,
First, the opening/closing door 52 of the heating furnace 51 is opened, and then the metal product W is pulled out horizontally from inside the heating furnace 51 and placed on the lifting platform 54, and then the lifting platform 54 is moved to the cooling tank 53.
Since a three-stage operation of vertically lowering the metal product inward is required, it takes a considerable amount of time to cool down the heated metal product.

In particular, if a heavy metal product W is pulled out of the heating furnace 51 forcefully, a large reaction will occur, so it is necessary to pull it out slowly to avoid impact. There was a problem in that it took a long time to immerse the steel in the quenching process, and the quality of the quenching deteriorated.

In addition, the present applicant claims that the metal product W drawn out from the heating furnace
A lifting platform 54 is used as a means to instantly drop the liquid into the cooling tank.
However, instead of a lift cage, a cylinder for moving a single-acting ram up and down is provided at the bottom of the cooling tank 53, and a device is proposed in which the heated metal product W is placed on a pedestal provided at the upper end of the single-acting ram and dropped. (Refer to Japanese Utility Model Publication No. 62-174.66.) In this case, the cylinder had to be buried deep underground, resulting in a significant increase in equipment costs.

Therefore, the technical object of the present invention is to enable a heated metal product to be dropped into a cooling tank more quickly than before with relatively low equipment cost.

[Means to solve the problem]

In order to solve this problem, the present invention provides a quenching device that quenches metal products heated to high temperature in a heating furnace by immersing them in a cooling liquid in a cooling tank, which is installed directly above the cooling tank. An entrance for metal products is opened at the bottom of the installed heating furnace, and an opening/closing door is provided to close the entrance. It is characterized by a vertical chain that is removably connected to the conveyor table that arrives at the conveyor table and sends the metal products suspended from the conveyor table into the heating furnace and the cooling tank. .

[Effect]

According to the present invention, when the conveyor platform on which the metal product is suspended arrives between the cooling tank and the heating furnace disposed directly above it,
First, an opening/closing door provided at the bottom of the heating furnace is opened, and then a lifting chain vertically installed inside the heating furnace is lowered and connected to a conveyance table.

Then, when the elevating chain rises and the metal products suspended from the conveyor platform connected to the chains are sent into the heating furnace, the opening/closing door of the heating furnace is closed and heating of the metal products begins. Ru.

When the heating of the metal products is completed, the opening/closing door of the heating furnace is opened, and at the same time, the lifting chain is lowered, and the heated metal products are suspended in the cooling tank on the conveyor table. It is sent and rapidly cooled in the cooling liquid stored in the cooling tank.

Therefore, the operation of feeding the heated metal products into the cooling tank requires only two steps: opening the door of the heating furnace and lowering the lifting chain, and the time from completion of heating to cooling is longer than before. The time required for quenching is also significantly reduced, improving the quenching quality.

In particular, according to the present invention, a heated metal product is vertically lowered through an entrance/exit opened at the bottom of a heating furnace.
Since the metal products are directly fed into the cooling tank directly below, even if the metal products are large and heavy, there will be no reaction or shock when they are quickly taken out of the heating furnace.

Furthermore, since the high-temperature air inside the heating furnace has a lower specific gravity than the air outside, even if the opening/closing door of the entrance/exit opening at the bottom of the heating furnace is opened, it hardly flows out to the outside. Therefore, even if the opening/closing door is open while the metal products are sent into the cooling tank and cooled by the lifting chain vertically installed inside the heating furnace, the heat loss inside the heating furnace is extremely small.

In addition to the above configuration, there is a position between the heating furnace and the cooling tank to support both the left and right ends of the conveyor platform that has arrived between them, and a lifting chain to suspend the metal product sent into the cooling tank. By providing a pair of left and right elevating frames that can be raised and lowered back and forth between the positions that receive the left and right ends of the conveyor table, when the conveyor table suspending metal products sent into the cooling tank is received by the elevating frame. , since it is possible to remove the lifting chain from the conveyance table, raise only the chain into the heating furnace, and close the opening/closing door of the heating furnace.
It is possible to reliably prevent the temperature inside the furnace from dropping, thereby saving energy and running costs.

〔Example〕

Hereinafter, the present invention will be specifically described based on embodiments shown in the drawings.

FIG. 1 is a front view of a hardening apparatus according to the present invention, FIG. 2 is a side view thereof, and FIGS. 3 and 4 are a front view and a side view showing essential parts.

In the figure, l is a heating furnace that heats the metal products W to a high temperature with electric heaters H provided on the left and right side walls, and is located in the loading zone Z where the conveyor table 2 on which the metal products W are suspended is transported. A cooling tank 3 containing a cooling liquid for rapidly cooling the metal products W heated to a high temperature in the heating furnace I is formed directly above the carry-in/out zone Z.

An entrance/exit 4 for metal products W is opened at the bottom of the heating furnace 1, and opening/closing doors 6R and 6L are slidably provided on a rail 5 disposed horizontally along the entrance/exit 4.

Opening/closing R6R and 6L are chains 8 that are wound around subblocks L-7R and 7L arranged at both ends of the rail 5.
R and 8L, piston rod 1 of cylinder 9
By expanding and contracting the sprocket 7L, the sprocket 7L, which is engaged with the rank 10a of the piston rod 10, is rotated forward and backward to open and close.

Further, from the ceiling of the heating furnace 1, a lifting chain 11° 11-., which is removably connected to the conveying table 2 which has suspended the metal product W and has arrived at the carry-in ratio zone Z, is connected to the conveying table. A plurality of U-bolts 2a, 2a- are installed vertically corresponding to the positions of the U-bolts 2a, 2a- attached to the top surface of the 2.

Each lifting chain 11 is made of a material that does not easily twist, such as a roller chain, and has a hook l at its tip that is hooked onto a U-bolt 2a attached to the transport platform 2.1. A is attached.

In addition, 12 is a cylinder that drives the lifting chain 11, and by moving a pair of movable pulleys 12b and 12c attached to the tip of the piston rod 123 forward and backward, the fixed pulley 11b is rotated forward and backward to move up and down. It is configured to move up and down the chain 11 for use.

Reference numeral 13 denotes a pair of left and right elevating racks that support both left and right ends of the conveyance table 2, and a transfer position P1 that supports both left and right ends of the conveyor table 2 that has arrived at the carry-in ratio zone Z, and a lifting chain 11.
The metal product W sent into the cooling tank 3 is lifted and lowered back and forth between a cooling position P2 that receives both left and right ends of the conveyor table 2 from which the metal product W is suspended.

That is, the elevating frame 13 first guides and supports the conveying table 2 at the transfer position P1 when the conveying table 2 arrives at the carry-in ratio zone Z, and then the conveying table 2 is moved to the heating furnace 1 by the elevating chain 11. While the metal product W is being heated in the heating furnace L, the metal product W is lowered to the cooling position P2,
Next, when the metal product W is sent into the cooling tank 3,
The metal product W is received at the cooling position P2, and when the hardening is completed, the metal product W is transferred to the carry-in ratio zone Z together with the conveyor table 2.
It is designed to raise the level.

FIG. 3 is a front view showing the elevating drive device 14 of the elevating pedestal 13, in which the elevating pedestal 13, which is connected to the tip of the chain 1G that is run in the vertical direction by the motor 15, is moved along the guide rail 17. It is configured to move up and down between the position P and the cooling position 22.

The guide rail 17 is configured such that its lower end 1.72 is bent outward by a link mechanism 19 driven by a cylinder 18.

That is, since the elevating frame 13 protrudes inside the rail 17, when it is lowered to the cooling position P2 and is on standby,
In order to prevent the metal product W fed into the cooling tank 3 from the heating furnace 1 from hitting the elevating pedestal I3, the lower end portion 17a of the rail is bent outward and the pedestal 13 is rotated downward and retracted.

Then, just before the metal product W is sent into the cooling tank 3 and the conveyance table 2 reaches the cooling position Pt, the lower end of the rail 1
7a is returned to the straightened state, and the elevating frame 13 is projected inward to receive the transport platform 2.

Moreover, FIG. 4 is a side view showing the release device 20 that removes the lifting chain 11 from the conveyance table 2 received by the lifting frame 13 at the cooling position P2.

The release device 20 includes a slider 21 that pushes and moves the transport platform 2 by a predetermined distance along the longitudinal direction of the elevating platform 13.
, and a cylinder 22 for moving the slider 21 forward and backward.

The slider 21 has a rear end 23a so as to rotate upward.
The slider 21 is configured to run on a supported horizontal rail 23, and the tip of the slider 21 is provided with a protrusion 24 that pushes the carrier 2, and the upper end is a cylinder that is offset from the fulcrum 23a position of the horizontal rail 23. 22 piston rods 22a are connected.

Therefore, when the piston rod 22a contracts, the slider 21 retreats, and when it reaches the rear end of the horizontal rail 23, the horizontal rail 23 moves through the slider 21 to the fulcrum 2.
It rotates upward around 3a, and the portion protruding into the cooling tank 3 is retracted.

Furthermore, when the piston rod 22a extends, the horizontal rail 23 returns to the horizontal position, and the slider 22 moves forward along the horizontal rail 23, pushing the carrier 2 with the protrusion 24 provided at the tip. has been completed.

The above is an example of the configuration of the present invention, and the operation thereof will be explained next.

When attempting to harden the metal product W suspended from the conveyor table 2, after opening the opening/closing doors 6R and 6L of the heating furnace 1, lower the lifting chain 11°ti-.
When the conveyance table 2 arrives at the carry-in amount zone Z, it is made to stand by at a height at which the hook lla at the tip of the lifting chain 11 can engage with the U pole 1-2a of the conveyance table 2.

When the conveyance table 2 on which the metal product W is suspended arrives at the carry-in amount zone Z, the conveyance table 2 is guided and supported by the elevating frame 13 on both the left and right sides, and at the same time, each U on the upper surface of the conveyance table 2
The bolts 2a are engaged with each hook Ila of the elevating chain 11, respectively.

Next, when the elevating chains 11, 11, . . . are pulled up, the metal product W is housed in the heating furnace 1 while being suspended from the conveyor table 2, and the openings i6R and 6L are closed and heated to a high temperature.

During this time, the elevating frame 13 is lowered and stands by at the cooling position P.

After the heat treatment is completed, the opening/closing doors 6R and 6L are opened, the lifting chain 11 is lowered, and the metal product W is opened.
is sent into the cooling tank 3.

In this way, since the heating furnace 1 is located directly above the cooling tank 3, when sending the metal products W from the heating furnace 1 to the cooling tank 3, the opening/closing doors 6R and 6L provided at the bottom of the heating furnace 1 are opened. Only two steps of opening and lowering are required, and there is no need to move the heavy metal product W horizontally, so it can be sent into the cooling tank 3 in an extremely short time.

In addition, since the elevating frame 13 and the release device 20, which normally protrude inward from the periphery of the cooling tank 3, are retracted when the metal product W is sent into the cooling tank 3, the allowable dimensions of the cooling tank 3 are Even when hardening a metal product W with large dust, the metal product W will not be damaged by hitting the lifting frame 13 or the release device 20.

Then, the transport platform 2 is at the cooling position P! Just before being descended into
The elevating frame 13, which had been evacuated, returns to its original position, and the transport platform 2 is received thereon.

After that, if the lifting chains ti, ii, etc. are further lowered and the transport platform 2 is moved, the hooks lla and Upol)
Lower it to a height where it is no longer aligned with 2a.

Here, when the cylinder 22 of the release device 20 is activated and the slider 21 is advanced to push the conveyor table 2 and move it a predetermined distance, the engagement between the lifting chain 11 and the conveyor table 2 is released, and then the lifting chain 11 in the heating furnace 1,
Open/close n6R and 6L.

Note that the opening/closing doors m6R and 6L are provided at the bottom of the heating furnace l, so even if these are opened, the high temperature air in the heating furnace rarely flows out to the outside. If 6L and 6L are closed, the effect of energy saving will be even greater.

After cooling is completed, the elevating frame 13 is moved to the transfer position P.
1 and lift the processed metal products W along with the transport platform 2 to the carry-in zone Z, and then carry them out to the next process to complete the hardening work.

Note that, as in the above embodiment, the metal product W is not limited to the case where it is processed while being hung on the transport table 2, but also when it is stored in a cage provided on the transport table 2 and processed. Good too.

Further, the opening/closing doors 6R and 6L are not limited to being opened and closed horizontally, and any opening/closing method such as double doors may be adopted.

〔effect〕

As described above, according to the present invention, the lift chain is lowered at the same time as the opening/closing door provided at the bottom of the heating furnace is opened, and the metal product heated to high temperature is placed directly below the heating furnace. Since the product is fed into the cooling tank, the process from pulling it out of the heating furnace to sending it into the cooling tank requires only two steps: opening the door and lowering the metal product. Moreover, the heating furnace and cooling tank are arranged above and below. Because the metal products are transported into the cooling tank, all you have to do is lower the lifting chain, which greatly reduces the time it takes to transport the metal products from the heating furnace to the cooling tank, which improves the quality of quenching. can be improved.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a hardening apparatus according to the present invention, Fig. 2 is a side view thereof, Figs. 3 and 4 are front and side views showing the main parts, respectively, and Fig. 5 is a conventional FIG. 2 is a schematic configuration diagram of an input device. Explanation of symbols W--Metal products, Z--Transportation zone, 1-Heating furnace,
2-Transportation platform, 3.-Cooling tank, 4.-Entrance/exit, 6R16L
- Opening/closing door, 11 - Lifting chain, 13-... Lifting frame. ! Figure

Claims (2)

[Claims] (1) Metal products (W) heated to high temperature in the heating furnace (1)
) is immersed in a cooling liquid in a cooling tank (3) to rapidly cool the metal products. (4) is opened, and the opening/closing doors (6R, 6L) that close the entrance/exit are opened.
) is provided in the heating furnace (1), and the metal product (W) is suspended and connected to and disconnected from the transport platform (2) that comes between the heating furnace (1) and the cooling tank (3). The metal products (W), which are freely connected and suspended on the conveyance table (2), are placed in a heating furnace (
1) and into the cooling tank (3).
A quenching device characterized in that 1) is installed vertically. (2) A position (P_
1), and a transport platform (2) on which the metal product (W) sent into the cooling tank (3) is suspended by the lifting chain (11).
2. The quenching apparatus according to claim 1, further comprising a pair of left and right elevating frames (13) that are reciprocally raised and lowered between a position (P_2) that receives both left and right ends of the left and right ends (P_2).