JP2972448B2 - Heat treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat treatment apparatus for successively carrying workpieces, which are continuously conveyed, into a plurality of closed-box-type heat treatment furnaces and individually performing heat treatment.

[0002]

2. Description of the Related Art A heat treatment apparatus for heat-treating a work which is continuously conveyed is roughly classified into a heat treatment furnace of a tunnel type having both open ends, and the work is heated while passing at a constant speed. (Japanese Patent Application Laid-Open No. 61-84321)
And a plurality of hermetically sealed box-type heat treatment furnaces are arranged side by side, and the work is sequentially carried in, the opening and closing door is closed, and after a certain time, the opening and closing door is opened to sequentially carry out the work (Japanese Patent Application Laid-Open (JP-A) no. No. 61-76873).

[0003] In the case of using the former tunnel type heat treatment furnace, a sand discharging conveyor is provided at the bottom of the furnace, and sand dropped from the surface of the work into the furnace when heat treatment is performed on a cast product. It is blown up by hot air and the like, and is discharged by the conveyor so as not to adhere to the surface of the work or to damage the surface of the work.

[0004]

However, in the latter case in which a plurality of closed box-type heat treatment furnaces are juxtaposed,
Since the furnace chamber is formed independently for each heat treatment furnace,
It is not possible to provide a sand discharging conveyor as provided in a tunnel type heat treatment furnace. Therefore, when the sand accumulates, the inside of all the heat treatment furnaces must be manually cleaned at a rate of once or twice a week, for example, which is very troublesome. Therefore, an object of the present invention is to make it possible to automatically discharge sand accumulated at the bottom of a plurality of closed box-type heat treatment furnaces.

[0005]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention provides a heat treatment apparatus in which continuously conveyed works are sequentially carried into a plurality of closed box type heat treatment furnaces and individually heat-treated. The heat treatment furnaces are arranged side by side in a row, and a hopper for collecting sand dropped from the work is formed at the bottom thereof, and a sand discharge port closed by a sand discharge door is formed on the hopper, A vacuum apparatus having a suction port which is moved forward and backward with respect to the mouth to open the sand discharging door to be connected to the sand discharging port is mounted on a bogie traveling and moving along the heat treatment furnace.

[0006]

According to the present invention, the sand dropped into the heat treatment furnace is collected in the hopper, and the truck equipped with the vacuum device is moved along the heat treatment furnace to stop at the position corresponding to the sand discharge port. When the suction port is advanced to the sand discharge port, the sand discharge door is pushed open and the two are connected. In this state, the sand in each heat treatment furnace is automatically activated by starting the vacuum device in this state. Is sucked and discharged.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on embodiments shown in the drawings. FIG. 1 is a front view showing the device of the present invention,
FIG. 2 is a side view thereof.

The heat treatment apparatus includes a closed box type heat treatment furnace 1 capable of individually setting temperature conditions in accordance with heat treatment conditions of a work, and a work transfer device 3 for loading and unloading the work to and from the heat treatment furnace 1. In addition, a cooling liquid tank 4 is provided for rapidly cooling a workpiece heated during quenching.

The heat treatment furnace 1 is arranged side by side with the work loading / unloading port 5 facing the front, and a hopper 6 for collecting sand dropped from the work is formed at the bottom.
Has a sand discharge port 7 closed by a sand discharge door 8.
9 is a sand discharging device for discharging sand in the heat treatment furnace 1,
A truck 11 that travels and moves on a rail 10 laid along the lower part of the heat treatment furnace 1 is moved forward and backward with respect to the sand discharge port 7 and pushes open the sand discharge door 8 to be connected to the sand discharge port 7. A vacuum device 13 having a suction port 12 is mounted.

The vacuum device 13 is provided with an elevating device 14 for vertically extending and retracting the suction port 12 opened upward to advance and retreat with respect to the sand discharge port 7. When positioned, the suction port 12 is extended with respect to the sand discharge port 7. In addition, the suction port 12 is formed to have a diameter larger than that of the sand discharge port 7, and a packing 12 a that is in close contact with a furnace wall is attached to a tip end thereof. The tip is closely attached to the furnace wall so as to include the sand discharge port 7 and the suction port 12
And the sand discharge port 7 are connected in an airtight state.

Further, the sand discharging door 8 that closes the sand discharging port 7 is maintained in a closed state by, for example, the elasticity of the hinge 15 with a spring, and the suction port 12 is extended at the rear end thereof. A lever 16 which is pushed by the packing 12a at the tip thereof and opens the sand discharging door 8 against the resilience of the hinge 15 with spring is attached.

The work transfer device 3 includes an elevator device 18 for lifting and lowering a lift 17 provided with a work loading / unloading mechanism for loading and unloading the work into and out of the heat treatment furnace. It is movably arranged on the top.

The cooling liquid tank 4 is provided with two water tanks 4a and 4b having different water temperatures so that the temperature of the cooling water can be selected according to the heat treatment conditions.
8 laid inside rail 19 for guiding 8
It is arranged so as to be movable on the upper side, so that either one of the water tanks 4a and 4b can be selected and moved to the lowered position of the lift 17.

The above is an example of the configuration of the present invention, and its operation will now be described. For example, when quenching a workpiece cast by a sand casting method, first, two heat treatment furnaces X and Y adjacent to each other are paired, the heat treatment furnace X is set to a predetermined quenching temperature, and the heat treatment furnace Y Is set to a predetermined tempering temperature. Next, the work with the mold removed is put into the cage C, and is sequentially carried into the heat treatment furnace X by the work transfer mechanism 3 and quenched and heated. The tempering heating is performed in another heat treatment furnace Y. In this case, the work to be quenched and heated is transported in a state where sand-type sand remains on its surface, and the sand falls during the heat treatment, so that the hopper 6 formed at the bottom of the heat treatment furnace 1 is formed. Gradually accumulates sand.

When, for example, one week's work has been completed, the carriage 11 is moved to the rightmost heat treatment furnace 1 so that the suction port 12 of the vacuum device 13 is located immediately below the sand discharge port 7 of the heat treatment furnace 1. When the suction port 12 is extended upward at the position where the suction port 1 is stopped,
Since the packing 12a at the tip of No. 2 pushes up the lever 16 of the sand discharging door 8 of the sand discharging port 7, the sand discharging door 8 is opened against the elasticity of the hinge 15 with spring.

Next, when the suction port 12 is further extended, the packing 12a is brought into close contact with the bottom outer wall surface of the heat treatment furnace 1 and the sand discharge port 7 is connected so as to be covered by the suction port 12. Turn on. At this time, since the sand discharging door 8 is open, not only the sand accumulated on the sand discharging door 8 but also the sand in the heat treatment furnace 1 is removed by the vacuum device 1.
It is forcibly sucked into 3. If the work loading / unloading port 5 of the heat treatment furnace 1 is slightly opened when sucking the sand in the furnace 1, the air flows smoothly and the sand in the furnace 1 can be efficiently sucked.

After suction for a certain period of time, the vacuum device 13 is turned off and the suction port 7 is contracted.
Is closed by the resilience of the spring hinge 15, and the cleaning operation ends. Next, the cart 1 is placed in the heat treatment furnace 1 on the left side.
1 is sequentially moved to suck and discharge the sand. Note that the present invention is not limited to the case where the heat treatment furnaces 1 are arranged in a row in a horizontal direction. It may be a case in which rows are arranged on both left and right sides along the moving direction.

[0018]

As described above, according to the present invention, when the truck on which the vacuum device is mounted is moved so that the suction port advances to each of the sand discharge ports, the sand discharge door is opened and the connection is established. By operating the vacuum device in this state, there is an excellent effect that sand accumulated in the furnace can be reliably and automatically sucked and discharged.

[Brief description of the drawings]

FIG. 1 is a front view showing a heat treatment apparatus according to the present invention.

FIG. 2 is a side view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Heat treatment furnace 3 ... Work transfer device 4 ... Coolant tank 6 ... Hopper 7 ... Sand discharge port 8 ... Sand discharge door 9 ... Sand discharge device 11 ... Truck 12 ・ ・ ・ Suction port 13 ・ ・ ・ Vacuum device

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Nobuya Kuimoto 1-9-9 Kakimotocho, Toyota City, Aichi Prefecture Inside Trinity Industry Co., Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) C21D 1 / 18 C21D 1/63

Claims (1)

(57) [Claims] 1. A heat treatment apparatus in which continuously conveyed workpieces are sequentially carried into a plurality of closed box type heat treatment furnaces (1) and individually heat-treated, wherein the heat treatment furnaces (1) are arranged in a horizontal line. A hopper (6) for collecting sand dropped from the work is formed at the bottom of the hopper, and the hopper (6)
Is formed with a sand discharge port (7) closed by a sand discharge door (8). The sand discharge port (7) is moved forward and backward with respect to the sand discharge port (7) to open the sand discharge door (8). A heat treatment apparatus characterized in that a vacuum device (13) having a suction port (12) connected to a heat treatment furnace (1) is mounted on a trolley (11) traveling and moving along the heat treatment furnace (1).