JPH055885B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a conveying device that takes in and sends out a processed product, for example, takes the processed product into the furnace chamber from outside the furnace of various types of furnaces, and transports the processed product outside the furnace after heat treatment. It relates to a conveyance device for sending out to.

[Prior art]

When heating processed products such as steel materials, multiple processing steps such as preheating, heating, carburizing, nitriding, and quenching are required. In order to improve the efficiency of the heat treatment process, it is desirable to connect furnaces that perform different processes and perform the heat treatment in a continuous flow, but in the past, each process was performed in separate furnaces. There are many places to be.

FIG. 1 shows a conventional conveying device installed in a quenching furnace when performing the above-mentioned individual heat treatment.
A brief description is given below.

Quenching oil 2 is stored in the lower part of the furnace body 1.
A vertical elevating rail 3 is provided across the lower and upper parts of the. An L-shaped elevating frame 4 is attached to the elevating rail 3 via rollers 5, and the elevating frame 4 can be raised and lowered by means of an elevating cylinder 6. Further, the elevating frame 4 is provided with a fork rail 7 extending in the horizontal direction, and the fork rail 7 is provided with a fork 8 that extends and contracts in two stages. An arm 10 that is swung by a cylinder 9 for operating the fork is engaged with the fork 8, and as the arm 10 swings, the fork 8 expands and contracts.

When performing quenching treatment using the above-mentioned conveying device,
The inlet 11 of the quenching furnace is opened, the lifting frame 4 is raised by the cylinder 6, and the arm 10 is swung;
The fork 8 is passed through the inlet 11 and extended out of the furnace. A processed product 12 is placed at the position where the fork 8 extends, and after lifting the tip of the fork 8 slightly and cutting off the processed product 12, the cylinder 9 is actuated to move the fork 8 through the arm 10. The process is shortened and the processed product 12 is taken into the furnace. Next, the lifting frame 4 is lowered and the processed product 12 is immersed in the quenching oil 2 for a required period of time.

When carrying out the processed product 12 out of the furnace, the above operation may be performed in reverse.

In the above-mentioned conventional conveying device, the fork 8 is supported in a cantilevered manner, so a support part is required below the place where the processed product 12 is placed, and this supporting part becomes a dead space and is The furnace becomes larger. Since the swinging arm 10 is provided in the furnace, it becomes an obstacle to gas circulation when a desired gas atmosphere is created. In addition, both ends of the shaft supporting the arm 10 pass through the furnace body 1, and although not shown, the components of the device for lifting the tip of the fork 8 pass through the furnace body 1, so there are many sealing points. It is difficult to create a vacuum state. Furthermore, since the above-mentioned conveyance device can only move the processed product 12 in and out of the furnace in one direction, when a quenching furnace is installed online, a device for loading or sending the processed product into the furnace from the opposite direction is required. Must be provided separately.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a conveying device that is simple in structure, compact, and does not require dead space, and that takes in processed products from one direction and sends them out in the opposite direction, thereby solving the problems of the prior art described above.

[Structure of the invention]

The present invention comprises a chain conveyor provided with a delivery dog and a conveyance bar, and a conveyance lever that can engage a conveyance bar at one end and a conveyed object at the other end, and the conveyance bar and conveyance lever are engaged with each other. The conveyed object can be pulled in by the conveyor, and then transferred by the movement of the chain conveyor.
Furthermore, it can be delivered by a delivery dog.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a layout diagram of an industrial furnace in which a front chamber 15, a heating chamber 16, and a quenching chamber 17 are arranged in series, and shows an example in which a conveying device 18 according to the present invention is implemented in the quenching chamber 17 of the industrial furnace. .

To explain the general heat treatment process in FIG. 2, the processed product 12 placed on the table 19 outside the furnace is loaded into the front chamber 15 with the insertion door 20 opened, and after the insertion door 20 is closed, Preheating or vacuum heating vaporization cleaning is performed in the chamber 15 . When the required processing is performed in the front chamber 15, the partition door 21 is opened and the heating chamber 16 is opened.
When the chambers 15 and 16 are closed by the partition door 21, the heating chamber 16 is filled with a heat treatment gas or liquid agent to create the required atmosphere for carburizing, nitriding, etc. Further, the intermediate door 22 is opened, the processed product 12 is taken in by the transfer device 18 provided in the quenching chamber 17, and the intermediate door 22 is closed. The conveying device 18 is operated to immerse the processed product 12 in the quenching oil 2 to perform the quenching process. When the quenching process is completed, the processed product 12 is pulled up,
The extraction door 23 is opened and the extract is delivered to the outside table 19 by the conveyance device 18.

Thus, by sequentially charging new products to be processed into the front chamber 15 in accordance with the flow of products to be processed, the products to be processed can be continuously heat-treated.

Next, the conveying device 18 described above in FIGS. 3 to 5 will be described in detail.

A pair of lifting rails 24 on the left and right inside the quenching chamber 17,
24 are provided facing each other, and the elevating rails 24, 24
A T-shaped elevating frame 26 is attached via rollers 25 so that it can be raised and lowered. The lifting frame 26 is appropriately reinforced by a diagonal member 27, an upper beam 28, etc., and the lower end of a rod 31 of an lifting shaft 30 vertically attached to the top plate 29 of the quenching chamber 17 is connected to the beam 28.

A driven shaft 32 and a drive shaft 33 are rotatably attached to the front part (extraction door 23 side) and the rear part (intermediate door 22 side) of the elevating frame 26, respectively, and a pair of driven sprockets 34 are attached to each of the driven shaft 32 and the drive shaft 33. , drive sprocket 35
Insert. A conveyor chain 36 is endlessly wound around the driven sprocket 34 and the drive sprocket 35, and the left and right conveyor chains 36, 36
The conveyor bar 37 is attached to the conveyor chains 36, 36 at the required positions.
8 (see Figure 6).

A pair of flanged guide rollers 39 are fitted onto the drive shaft 33, and a support rod 40 is attached in front of the guide rollers 39. The guide roller 39
A U-shaped conveyance lever 41 opening toward the rear is fitted into the groove, and the conveyance bar 37 can be fitted into and removed from a hook portion 42 provided on the lower surface of the front end of the conveyance lever 41.

Further, the conveyance lever 41 has a length such that it rests on the driven shaft 32 and the support rod 40 when the conveyance bar 37 is detached, and the portion that comes into contact with the driven shaft 32 is stably supported on the driven shaft 32. A recessed portion 43 is formed so as to be formed. Further, the lower surface of the rear end of the transport lever 41 is chamfered so that it can easily ride on the guide roller 39, and a ratchet 44 is provided at the rear end as shown in FIG.

The pivot point and the center of gravity of the ratchet 44 are eccentric, so that one end always protrudes from the upper surface of the transport lever 41, and the ratchet 44 has a structure that allows it to freely rotate clockwise but not counterclockwise. It is as follows.

One end of the drive shaft 33 is connected to the elevating frame 2
6, and a sprocket 45 is fitted to the extending end (see FIG. 4). Further, an axle box 47 is provided on the side wall 46 on the extended end side of the quenching chamber 17, and a rotary shaft 48 is rotatably and airtightly attached to the axle box 47. Sprockets 49 and 50 are fixed to the outdoor end and the indoor end of the rotating shaft 48, and the sprocket 49 at the outdoor end and a sprocket 51 provided on a motor reducer 52 are connected by a chain 53.

A first arm 5 is provided at the extending end of the drive shaft 33.
One end of the second arm 55 is pivotally connected to the indoor end of the rotary shaft 48, and the arms 54 and 55 are rotatably connected by an idler shaft 63. Sprockets 56 and 5 are provided at the shaft end of the rotating shaft 48 inside the quenching chamber and at both ends of the idler shaft 63, respectively.
7 and 58, and connect sprockets 56 and 57 and sprockets 45 and 58 with chains 59 and 60.

Incidentally, reference numeral 62 in the figure represents a support metal fitting for supporting the conveyance lever 41.

Next, the operation of the above device will be explained with reference to FIGS. 5 to 8.

The transport lever 37 and the hook portion 42 are on standby in an engaged state. When pulling out the processed product from the heating chamber 16, the sprocket 5 is moved by a motor (not shown).
1. Rotate the drive sprocket 35 of the drive shaft 33 counterclockwise via the chain 53, sprocket 49, sprocket 56, chain 59, sprocket 57, sprocket 58, and chain 60, and move the transport lever 41 to the left in the figure. Then, the rear end portion of the transfer lever 41 is made to protrude from the furnace wall toward the heating chamber 16 side.

In the above state, the front end of the processed product 12 is placed on the transport lever 41.
Make sure it overlaps the rear end of the. During this process, the upper end of the ratchet 44 sinks and returns to its original position in the recess at the bottom of the workpiece 12, so that the rear end of the transport lever 41 and the workpiece 12 engage with each other.

Next, the drive sprocket 35 is rotated clockwise to move the transport lever 41 to the right in the figure.

The processed product 12 is pulled until the front end is placed on the conveyor chain 36, and the transport bar and the transport lever 41
The hook portion 42 is separated. When the transport lever 41 and the transport bar 37 are separated, the recess 4 of the lever 41
3 and the driven shaft 32, and the rear end of the lever rests on the support hardware 62 and is supported below the conveying surface as shown in FIG. Upon further rotation, the processed product 12 is moved to the center of the furnace by the movement of the conveyor chain 36.

When the processed product 12 reaches the center of the furnace, the drive sprocket 35 is stopped.

The rod 31 of the elevating cylinder 30 is protruded, the elevating frame 26 is lowered, and the product 12 is transferred to the quenching oil 2.
immerse in it. When the elevating frame 26 descends, the bending state of the first arm 54 and the second arm 55 changes, the connection state between the rotation shaft 48 and the drive shaft 33 is maintained, and the sprockets 56, 57, 5
The rotations caused by the bending movements of the arms 8 and 45 cancel each other out, and do not cause the drive shaft 33 to rotate (FIG. 7).

The rod 31 is retracted, the elevating frame 26 is raised, and the product 12 to be processed is lifted up to the transport level.

Open the extraction door 23 and rotate the drive sprocket 35 further clockwise. As described above, the conveyor chain 36 is provided with a delivery dog 38 so as to be located immediately behind the product 12 when the product 12 is placed on the conveyor chain 36. As the sprocket 35 rotates clockwise, the processed product 12 moves to the right via the conveyor chain 36 , and eventually the front half of the processed product 12 comes off the conveyor chain 36 .
When the transfer ability is lost, the delivery dog 38 comes into contact with the rear end surface of the processed product 12 and sends the processed product 12 onto the out-of-furnace table 19 (FIG. 8). When most of the processed products 12 have been transferred to the table 19 outside the furnace,
Completely remove it from the furnace using the necessary means.

When the delivery of the processed product 12 is completed, the drive sprocket 35 is reversed. By reversing the sprocket 35, the conveyor chain 36 moves in the opposite direction to the aforementioned direction, and the conveyor bar 37 and the hook portion 42 engage with each other. As the conveyor chain 36 moves further, it enters the standby state as described above.

Thus, the conveyance operation of taking in the processed product 12 from one inlet and sending it out from the other outlet is completed.

As is clear from the above description of the structure and function of the present invention, the structure is simple and compact, and there is almost no dead space (especially in the horizontal direction).

In the above embodiment, the present invention is implemented in a quenching furnace, and an elevating device is also included, but it goes without saying that the present invention may be provided for simply transferring in the horizontal direction.

Further, the chain conveyor may have three or four rows.

〔Effect of the invention〕

As described above, according to the present invention, the following excellent effects can be exhibited.

(i) For transport only in the horizontal direction, only one driving source is required, and the structure is simple and compact.

(ii) All moving parts are housed inside the furnace, and the only place that penetrates the furnace body is the drive shaft, making it easy to seal.

(iii) The device can be miniaturized and almost no dead space is required.

(iv) Since the conveyance direction is unidirectional, it can be incorporated online.

(v) Since the number of component parts is small and simple, manufacturing costs are low and reliability and maintainability are improved.

[Brief explanation of the drawing]

FIG. 1 is an elevational view of a conventional conveying device, FIG. 2 is a layout diagram of an industrial furnace in which the present invention is implemented, FIG. 3 is a side view of an embodiment of the present invention, and FIG. 4 is a front view of the same. 5 to 8 are explanatory diagrams of the operation of this embodiment, and FIG. 9 is an explanatory diagram of the rear end portion of the conveyance lever. 18 is a conveyance device, 32 is a driven shaft, 33 is a drive shaft, 34 is a driven sprocket, 35 is a drive sprocket, 36 is a conveyor chain, 3
7 is a conveyance bar, 38 is a delivery dog, 39 is a guide roller, 41 is a conveyance lever, 42 is a hook portion, and 44 is a ratchet.

Claims (1)

[Claims] 1. A drive shaft and a driven shaft are arranged in parallel, a plurality of sprockets are attached to both shafts, a double conveyor chain is wound around the sprockets, and a delivery dock is protruded from a desired position of the conveyor chain. A conveyor bar is provided between two conveyor chains, a guide roller is fixed to one of the shafts, and a hook portion is formed at one end to be placed and guided by the guide roller and to be able to engage and disengage from the conveyor bar. A conveying device comprising: a conveying lever having a ratchet at the other end capable of engaging with an object to be conveyed.