JP7401572B2 - Furnace workpiece charging and extraction device - Google Patents

Description

The present invention relates to a workpiece charging/extracting device for a furnace, which is capable of loading a workpiece into the furnace and extracting the workpiece to the outside of the furnace by properly shutting off the inside and outside of the furnace without requiring maintenance.

As a furnace equipped with a device for charging a long workpiece such as a round steel or a pipe into the furnace or extracting it from the furnace in a direction transverse to the longitudinal direction of the workpiece, for example, Patent Documents 1- 3 is known.

The "furnace for heat-processing a workpiece" in Patent Document 1 is a furnace for heat-processing a workpiece, which has a blow-off hood provided with a nozzle for blowing out an air flow for heat-processing the workpiece. The conveying means for conveying the work is equipped with a drive mechanism that adjusts the distance between the nozzle and the part of the workpiece facing the nozzle so that the airflow blown from the nozzle hits the workpiece at a desired flow rate, This is a walking beam type conveyance means that performs rectangular motion or circular motion in a vertical plane accompanied by movement of the workpiece. In accordance with the movement timing, the distance between the nozzle and the part of the workpiece facing the nozzle is adjusted at the same vertical speed as the vertical speed of the vertical component of the workpiece movement, and with the same vertical stroke amount as the vertical stroke amount of the workpiece. A control device is provided, into which information regarding the dimensions of the workpiece and a control value for the vertical movement of the walking beam conveyance means are inputted, and the control device is connected to the drive mechanism and receives information regarding the dimensions of the workpiece. The drive mechanism is driven and controlled by outputting information and control values, and the nozzles are arranged in plurality in the direction in which the workpiece is conveyed in the zone where the thermal processing is performed, and the drive mechanism is configured to control the drive mechanism according to the information and control values. The distance between the nozzle and the workpiece portion facing the nozzle is individually adjusted for each of the plurality of nozzles.

The "charging/extracting device for a heating furnace equipped with a sealing device" of Patent Document 2 has a pocket portion formed by recessing a part of the circumferential surface in the axial direction at the material charging port and/or extraction port. A rotary door that is freely rotatable and a casing that covers a part of the outer periphery of the rotary door are provided, and the casing has an opening and a sealing member that can move forward and backward within the opening is inserted, The seal member has a first pressure contact surface that presses the rotating door circumferential surface, and a second pressure contact surface that presses the inner circumference of the opening of the casing.

The "charging/extracting device for a heating furnace equipped with a sealing device" in Patent Document 3 is rotatably arranged at a material charging port and/or extraction port, and a part of the circumferential surface is recessed in the axial direction. It has a rotating door with a pocket formed therein, and a sealing hood that is swingably disposed outside the furnace and can substantially close the opening area of the pocket when the pocket is positioned outside the furnace, and It is constructed by providing an outlet near the sealing hood for ejecting exhaust gas from the heating furnace into the sealing hood.

Patent No. 5795560 Special Publication No. 62-16249 Special Publication No. 63-9565

In the furnace disclosed in Patent Document 1, the opening for charging and extracting the workpiece is left open, or even if a door is provided, it is open while the workpiece is passing through, so there is no leakage from the opening. Outside air flows into the furnace, and heat inside the furnace dissipates outside the furnace.

The seal devices of Patent Documents 2 and 3 have a pocket portion for storing and transferring the material (workpiece) by recessing a part of the circumferential surface in the axial direction in order to prevent outside air from circulating during the passage of the workpiece. The heating furnace is equipped with a revolving door that forms a reciprocating door, and by swinging the revolving door back and forth, materials are charged into or extracted from the inside and outside of the heating furnace.

These charging/extracting devices are equipped with a sealing member that presses the circumferential surface of the rotating door and the inner circumference of the opening of the casing that covers part of the rotating door, as a means to isolate the inside and outside of the furnace. .

In this configuration, since the rotating door swings back and forth while the sealing member is in pressure contact with the circumferential surface of the rotating door and the inner circumference of the opening, the sealing member is abraded by sliding, creating a gap that communicates between the inside and outside of the furnace. occurs early, and the atmosphere inside the furnace leaks through this gap.

Furthermore, maintenance work such as replacing worn seal members is extremely complicated, and there is a problem in that the operation of the furnace must be stopped for maintenance.

The present invention was devised in view of the above-mentioned conventional problems, and it is possible to properly shut off the inside and outside of the furnace, charge the work into the furnace, and extract it out of the furnace without requiring maintenance. The purpose of the present invention is to provide a workpiece charging/extracting device for a furnace.

The workpiece charging/extracting device for a furnace according to the present invention is a device for charging a workpiece into or extracting the workpiece from the furnace in a direction intersecting the longitudinal direction of the workpiece. In order to charge or extract from the inside of the furnace, the furnace opening is formed to communicate between the inside and outside of the furnace, and has a recess for receiving and delivering the work from the transverse direction of the work. A drum that is rotated so as to be rotated from outside the furnace to inside the furnace or from inside the furnace to outside the furnace, and a water seal part that is provided at the lower part of the furnace opening and in which the lower part of the drum is immersed. It is characterized by being prepared.

The apparatus is characterized in that an air curtain device is provided above the furnace opening and forms an air curtain above the drum.

In the furnace workpiece charging/extracting device according to the present invention, the workpiece can be charged into the furnace and extracted to the outside of the furnace by appropriately shutting off the inside and outside of the furnace without requiring maintenance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram illustrating a preferred embodiment of a furnace workpiece charging and extraction device according to the present invention. FIG. 2 is a schematic perspective view showing a drum used in the workpiece charging/extracting device of the furnace shown in FIG. 1;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a furnace workpiece charging and extraction apparatus according to the present invention will be described in detail below with reference to the accompanying drawings.

The furnace workpiece charging/extracting device according to the present embodiment is configured to use a furnace opening of a heating furnace such as a walking beam type that transports and heat-treats a long round steel or pipe extending in a predetermined direction as a workpiece in a transport direction. be prepared for.

Furnace openings are provided at both ends of the furnace body in the direction in which the workpiece is transported, and the workpieces are loaded into the furnace and extracted from the furnace through these furnace openings.

Of course, the furnace is not limited to a heating furnace for heat treatment, and may be any other processing furnace.

In this embodiment, as shown in FIG. 1, the workpiece W, which is a round steel, is oriented in a direction perpendicular to the conveyance direction in its longitudinal direction, and is substantially horizontal in the direction intersecting the longitudinal direction (conveyance direction). , is charged into the furnace body 1 through the furnace opening 2, and extracted from the furnace body 1.

The furnace opening 2 is formed so as to communicate the inside and outside of the furnace body 1 in order to charge the workpiece W into the furnace body 1 .

On the extraction side, it is formed to communicate between the inside and outside of the furnace body 1 in order to extract the workpiece W to the outside of the furnace body 1 .

In the following explanation, a workpiece charging/extracting device 3 provided in the furnace opening 2 on the charging side will be taken as an example. Even on the extraction side, the configuration is the same and can be understood by flipping FIG. 1 left and right.

The furnace opening 2 is formed to be long and wide in the horizontal direction. The upper furnace wall 1a that defines the upper part of the furnace opening 2 is provided so as to protrude outward from the furnace body 1 than the lower furnace wall 1b that defines the lower part of the furnace opening 2.

A workpiece loading/extracting device 3 for a furnace according to the present embodiment includes a drum 4 rotatably supported by a furnace opening 2, and an air curtain device provided on the outside of the furnace wall 1a above the furnace opening 2. 5, a water tank 6 as a water seal part arranged outside the furnace body 1 and connected to the furnace wall 1b below the furnace opening 2, and a drive mechanism (not shown) for rotating the drum 4. .

The drum 4 and its drum shaft 4a are arranged in the vicinity of the furnace opening 2 of the furnace body 1 along the horizontal direction, orthogonal to the conveyance direction.

The drum 4 is formed to have a diameter D larger than the height H of the furnace opening 2 in the vertical direction. The drum 4 is positioned such that its upper portion protrudes upward from below the upper furnace wall 1a, and its lower portion is positioned so as to face the lower furnace wall 1b from the upstream side in the conveyance direction.

The drum 4 is provided with a recess 4b that is recessed along the longitudinal direction toward the center of the drum 4, that is, toward the drum shaft 4a, and is used to receive and deliver the work W from the lateral direction of the work W. In the illustrated example, the recess 4b is formed in the shape of a substantially arcuate groove.

A drive mechanism (not shown) that transmits rotational force is connected to the drum shaft 4a of the drum 4, and is configured to repeatedly rotate in a reciprocating direction within a predetermined angular range.

More specifically, the recess 4b of the drum 4 is located on the upper side of the drum 4, and the recess 4b is located further outside the furnace body 1 than the furnace opening 2 with respect to the upper furnace wall 1a. and a state where it is located inside the furnace body 1.

As shown in FIG. 2, the length of the recess 4b in the drum longitudinal direction is shorter than the overall length of the drum 4, and both ends of the recess 4b in the longitudinal direction of the drum 4 are partitioned by the circumferential surface 4c of the drum 4. . The recessed portion 4b receives and delivers the workpiece W whose length is shorter than the recessed portion 4b.

The concave shape of the concave portion 4b is formed such that the width in the direction along the drum circumferential direction gradually increases on the circumferential surface 4c side of the drum 4 so that the workpiece W can be transferred smoothly.

Water 6a is filled in the water tank 6, and the lower part of the drum 4 facing the lower furnace wall 1b is immersed.

Therefore, the space between the upper end of the furnace wall 1b below the furnace opening 2 and the drum 4 is sealed with water 6a in the water tank 6.

Furthermore, since the drum 4 is immersed in the water 6a in the water tank 6, the repeated rotation of the drum 4 causes the inside of the furnace body 1 to communicate with the outside through the furnace opening 2, and outside air flows into the furnace. This prevents the atmosphere inside the furnace from leaking out of the furnace.

The air curtain device 5 is arranged outside the furnace body 1 and provided on the upper furnace wall 1a. The air curtain device 5 includes a spout 5a that spouts air downward toward the circumferential surface 4c of the drum 4 over the entire width of the furnace opening 2.

The air ejected from the ejection port 5a forms an air curtain between the upper furnace wall 1a and the drum 4 that blocks the inside and outside of the furnace body 1.

Next, the operation of the furnace workpiece charging/extracting device according to this embodiment will be explained. The drum 4 has a receiving position for the workpiece W, where the recess 4b is located above the drum 4, and the recess 4b is located outside the furnace body 1 from the upper furnace wall 1a, as shown in FIG. As shown in FIG. 1(c), the recess 4b repeatedly rotates back and forth between the upper furnace wall 1a and a transfer position for the workpiece W located inside the furnace body 1.

Further, the lower part of the drum 4 is immersed in water 6a in a water tank 6, and air from the air curtain device 5 is blown toward the upper part of the drum 4 to form an air curtain.

When charging the workpiece W into the furnace body 1 from the outside of the furnace body 1, the workpiece W is supplied to the recess 4b when the recess 4b is located at the workpiece W receiving position.

The drum 4, in which the recess 4b has received the workpiece W, is rotated clockwise in the figure. At this time, as shown in FIG. 1(b), an air curtain is formed in the upper part of the drum 4 along the circumferential surface 4c, and the lower part of the drum 4 is rotated in the water tank 6 in a water-sealed state. be moved.

When the drum 4 further rotates and reaches the transfer position of the workpiece W as shown in FIG. will be delivered to.

Thereafter, the drum 4 is reversed and returns to the workpiece W receiving position shown in FIG. 1(a) again to receive the next workpiece W.

According to the furnace workpiece loading/extracting device 3 according to the present embodiment, the lower part of the drum 4, which repeatedly rotates back and forth and has the recess 4b for receiving and delivering the workpiece W located on the upper side, is stretched over the water tank 6. Since it is immersed in water 6a, the inside and outside of the furnace body 1 can be reliably shut off between the furnace opening 2 and the lower part of the drum 4.

Since the seal at the bottom of the drum 4 has a water-sealing structure, the rotating drum 4 will not be worn out, and no gap will be created that communicates the inside and outside of the furnace body 1. Therefore, the inside and outside of the furnace body 1 can be appropriately shut off without requiring maintenance.

Inside the furnace body 1, there are cases where the pressure at the bottom is lower than at the top, making it easier to draw outside air in. In this embodiment, the bottom of the drum 4 is sealed with water, so this situation can be avoided. It is also possible to effectively shut off the inside and outside of the furnace body 1.

An air curtain device 5 that blows air toward the top of the drum 4 to form an air curtain is provided above the furnace opening 2, so that the gap between the upper furnace wall 1a and the drum 4 is filled with air. It can be blocked off with curtains.

Since the seal on the upper part of the drum 4 is also an air curtain, the rotating drum 4 will not be worn out, and no gap will be created that communicates the inside and outside of the furnace body 1. Therefore, the inside and outside of the furnace body 1 can be appropriately shut off without requiring maintenance.

Further, in the above embodiment, an example in which the drum 4 is repeatedly rotated back and forth has been described, but the present invention is not limited to this. Of course, it is also possible to continue rotating in one direction and return to the workpiece W receiving position.

Further, the above embodiments are for facilitating understanding of the present invention, and are not intended to be interpreted as limiting the present invention. It goes without saying that the present invention may be modified and improved without departing from its spirit, and that the present invention includes equivalents thereof.

1 Furnace body 1a Furnace wall above the furnace opening 1b Furnace wall below the furnace opening 2 Furnace opening 3 Charging/extracting device 4 Drum 4a Drum shaft 4b Recess 4c Surrounding surface 5 Air curtain device 5a Spout 6 Water tank 6a Water 7 Conveyance section D Drum diameter H Vertical height of furnace opening W Workpiece

Claims (2)

A device for charging a workpiece into or extracting it from the furnace in a horizontal direction perpendicular to the longitudinal direction of the workpiece extending in the horizontal direction,
In order to charge the workpiece into the furnace or extract it from the furnace, the furnace opening is formed to communicate between the inside and outside of the furnace, and has a recess for receiving and transferring the workpiece from the short side direction of the workpiece. and a drum that is rotated so as to rotate the recess from outside the furnace to inside the furnace or from inside the furnace to outside the furnace;
A workpiece loading/extracting device for a furnace, comprising: a water seal provided at a lower part of the furnace opening, and into which a lower part of the drum is immersed.
2. The furnace workpiece loading/extracting device according to claim 1, further comprising an air curtain device provided above the furnace opening and forming an air curtain above the drum.

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