TW201326716A - In-furnace transporting apparatus and heating furnace - Google Patents

Abstract

This invention provides an in-furnace transporting apparatus which sequentially moves a work along fixed beams provided on a furnace bed in a heating furnace. This apparatus is very simple and relatively low-cost in comparison with an apparatus of a walking-beam type and can be easily maintained. In a heating furnace 10 a plurality of fixed beams 19 are provided above a furnace bed 13 to extend in the direction of moving of work A. A plurality of movement guide slots 17 piercing through the furnace bed 13 and extending in the direction of moving of work are formed and arranged over the width of the heating furnace. A cart 22 traveling along the movement guide slots 17 are provided to move the work supported by the fixed beams 14, such that, the work is supported by ascending a lift support member 22b which is provided on the cart 22 to extend upwards through the movement guide slots 17 and is capable of moving up and down. The work is sequentially moved by moving the cart 22 with the work supported by the lift support member 22b to a desired position.

Description

Furnace transfer device and heating furnace

The present invention relates to an in-furnace conveying device that conveys a workpiece in a furnace and a heating furnace including the in-furnace conveying device described above. Specifically, when the workpiece is conveyed in the furnace by the in-furnace conveyance device, the workpiece is sequentially moved in a fixed beam provided above the hearth along the conveyance direction. When moving up, the moving beam (moving beam) provided along the conveying direction of the workpiece moves back and forth in the vertical direction and the feeding direction by a moving frame, thereby performing a walking operation. The conventional walking type in-furnace conveying device which transports the object to be processed by sequentially moving the object on the fixed beam has the following features: the device is very simple, and the overall cost can be greatly reduced and maintained. (maintenance) and the like are also easily performed.

Conventionally, in a heating furnace or the like, a workpiece such as a steel sheet or a steel sheet is sequentially conveyed in a furnace and continuously processed, and the workpiece is sequentially conveyed in the furnace as described above. For the internal transport device, a walking beam type device is commonly used.

Here, in the walking beam type in-furnace conveying device, generally, such as Patent Document 1 (JP-A-63-50413), Patent Document 2 (Japanese Patent Laid-Open No. Hei 8-199227), Patent Document 3 (Japanese Laid-Open Patent Publication No. Hei 10-183235), and Patent Document 4 (Japanese Patent Laid-Open In the furnace bed provided in the furnace, a plurality of spacer supporting members are provided along the object to be processed at a predetermined interval in a direction orthogonal to the conveying direction of the workpiece. a fixed beam in the direction of conveyance, and a moving beam extending substantially along the conveying direction of the workpiece into a substantially full length of the furnace, and being held in a penetrating portion of the hearth from a moving frame provided below the hearth The support members projecting above the hearth are provided with a plurality of moving beams at a predetermined interval in a direction orthogonal to the conveyance direction of the workpiece.

Further, in the above-described walking beam type in-furnace conveying device, the moving frame is supported by the walking beam driving means, and the moving beam is driven by the walking beam driving means to move the moving beams provided on the moving frame The moving motion (rectangular motion) is reciprocated in the vertical direction and the feeding direction, and the objects to be processed are sequentially moved on the fixed beam by the moving beams, so that the objects to be processed are sequentially moved in the furnace.

Here, when the moving beam provided in the moving frame is moved by the walking beam driving means as described above, in order to increase the size of the walking beam driving means, and to provide the following under the hearth of the heating furnace or the like as described above The moving frame and/or the walking beam driving means must increase the digging depth below the hearth. Therefore, the aforementioned apparatus requires a large amount of cost, and requires a large amount of power required to drive the traveling beam driving means, and there is a problem that the running cost is also increased.

Further, in the heating furnace for heating the object to be treated, a walking beam as described above is provided In the in-furnace conveying apparatus of the type, in order to prevent deformation or damage of each of the moving beams described above, the moving beams are water-cooled.

However, in the walking beam type in-furnace conveying apparatus, in order to provide each moving beam so as to extend over the entire length of the furnace along the conveying direction of the workpiece, it is necessary to extend the furnace to the furnace as described above. A large-scale water-cooling apparatus required for water cooling of the entire moving beam of the entire length is also problematic, and water cooling loss is also increased.

An object of the present invention is to provide an in-furnace conveying device for conveying a workpiece in a furnace and a heating furnace including the above-described in-furnace conveying device, and to solve the above-described various types of the in-furnace conveying device using a walking beam type. Kind of problem.

In other words, in the furnace of a heating furnace or the like, when the objects to be processed are sequentially moved by the in-furnace conveying device on the fixed beam provided above the hearth, the object is compared. In the above-described walking beam type in-furnace conveying device, the equipment is extremely simple, and the overall cost can be greatly reduced, and maintenance and the like can be easily performed.

In the in-furnace conveyance device of the present invention, a plurality of conveyance directions along the object to be processed are provided at a predetermined interval in the direction orthogonal to the conveyance direction of the workpiece on the upper side of the hearth. And a plurality of transport guide grooves that pass through the hearth along the transport direction of the workpiece, and are disposed at a predetermined interval in a direction orthogonal to the transport direction of the workpiece, and are in the above-described hearth Below the transport guide The transport vehicle that travels in the transport direction of the object to be processed is provided with an elevating and holding portion that is raised and lowered by the transport guide groove and protrudes upward; and the in-furnace transport device raises the lift holding portion provided in the transport vehicle. The workpiece held by the fixed beam is held by the lift holding portion, and the transport vehicle is moved to transport the workpiece held by the lift holding portion to a predetermined position of the fixed beam.

In this way, it is not necessary to provide a large walking beam driving means as in the conventional walking beam type in-furnace conveying device, and the walking beam driving means is arranged along the conveying direction of the processed object and below the hearth to maintain the edge. The moving frame of the plurality of moving beams extending over the entire length of the furnace is moved in the direction in which the object is conveyed, and the moving frame is moved to reciprocate the moving beams in the vertical direction and the feeding direction to move the actor.

Further, as described above, in order to keep the object to be held in the lift holding portion provided in the moving vehicle, it is not necessary to provide a plurality of moving beams extending over the entire length of the furnace, such as a walking beam type in-furnace conveying device, and the furnace is provided. The structure inside is simple.

Here, in the in-furnace conveyance device, it is preferable to provide a cooling means for cooling the elevating and holding portion in order to prevent the elevating and holding portion that holds the workpiece from being excessively heated and deformed in the furnace.

In addition, when the lift holding portion of the transport vehicle is raised as described above, the workpiece held by the fixed beam is held by the lift holding portion, and the transport vehicle is moved to transport the workpiece held in the lift holding portion. When the predetermined position of the fixed beam is reached, a plurality of the transports can be provided in a direction orthogonal to the transport direction of the workpiece in accordance with each transport guide groove. car. Further, a plurality of the transport vehicles can be provided in plurality in a plurality of predetermined intervals along the transport direction of the workpiece.

Further, in the heating furnace of the present invention, when the objects to be processed are sequentially conveyed in the furnace and heated continuously, the apparatus is carried out by using the in-furnace conveying apparatus.

Further, in the heating furnace of the present invention, the side wall surface guide groove can be placed in the loading portion side of the heating furnace in which the workpiece is carried into the heating furnace, and the side wall surface guide groove can be placed in correspondence with the conveyance guide groove. The side wall surface guide groove guides the transport vehicle to the outside of the heating furnace on the loading unit side. In this manner, the transport vehicle can be guided to the outside of the heating furnace on the loading unit side to repair and replace the moving vehicle.

In addition, it is possible to provide a loading guide groove so as to be placed in the loading portion of the heating furnace so as to correspond to the above-described conveyance guide groove and the carry-in side wall guide groove, and to be provided by the carry-in guide groove. The lifting and lowering holding portion of the transporting vehicle is raised, and the object to be processed in the loading and unloading portion is held in the elevating and holding portion, and the object to be processed held in the elevating and holding portion is carried in through the loading guide groove and the side wall surface guiding groove. To the furnace. In this way, it is not necessary to carry in the object to be processed which is usually provided as another device.

Further, in the heating furnace of the present invention, the side wall surface guide groove can be carried out so as to be carried out in correspondence with the transfer guide groove on the carry-out portion side of the heating furnace that carries the workpiece to the outside of the heating furnace, and the carry-out is carried out. The side wall surface guide groove guides the transport vehicle to the outside of the heating furnace on the carry-out portion side. In this way, the transport vehicle can be guided to the outside of the heating furnace on the side of the carry-out portion. For the repair and replacement of moving vehicles.

In addition, it is possible to provide a carry-out guide groove so as to be carried in the elevating and holding portion of the transport vehicle, and to carry out the ejecting guide groove so as to correspond to the transport guide groove and the carry-out side wall guide groove. The object to be processed is carried out to the outside of the heating furnace by the above-described carry-out side wall guide groove and the carry-out guide groove. In this way, it is not necessary to carry out the unloading device of the object to be processed which is usually provided as another device.

In the in-furnace conveyance device of the present invention, the conveyance vehicle that travels in the conveyance direction of the workpiece below the hearth is provided with an elevation holding portion that is raised and lowered by the conveyance guide groove and is raised and lowered. When the lift holding portion is raised, the workpiece held by the fixed beam is held by the lift holding portion, and the transport vehicle is moved to move the workpiece held by the lift holding portion to a predetermined position of the fixed beam, and the processed object is processed. The objects are sequentially transported in the furnace, so that there is no need for a walking beam type in-furnace conveying device as in the prior art, and a moving frame for holding a plurality of moving beams and/or for driving under the hearth is provided. The moving frame is a large device for moving the beam driving means for moving the moving beams.

As a result, when the in-furnace conveying apparatus of the present invention is used, the digging depth under the hearth of the heating furnace or the like can be reduced, the cost required for the equipment can be drastically reduced, and the running cost can also be reduced, and further, the bed surface formed on the excavation Since only the structure of the rail for transporting the vehicle is laid, a wide space can be secured, and maintenance and the like can be easily performed.

Further, in the in-furnace conveying device of the present invention, since the object to be processed is In the state of being placed in the elevating and holding unit of the transport vehicle, the transporting vehicle is moved to transport the workpiece held by the elevating and holding unit to a predetermined position of the fixed beam, so that the elevating and holding unit can hold the object to be treated. The length of the degree is sufficient, and the moving beam of the in-furnace conveying device as in the conventional walking type is not required, and is disposed to extend along the conveying direction of the object to be substantially the entire length of the furnace, and is also eliminated when the lifting is maintained. When cooling the part, it is necessary to move the large water-cooling equipment of the beam as described above or to increase the problem of water cooling loss.

Further, in the heating furnace of the present invention, when the side wall surface guiding groove and the side wall surface guiding groove are carried in such a manner as to correspond to the conveying guide groove, the groove can be guided by the loading side wall surface and the side wall surface guiding groove can be carried out. By guiding the transport vehicle to the outside of the heating furnace, maintenance and replacement of the transport vehicle can be easily performed without stopping the heating furnace and cooling it.

In addition, when the loading unit that carries the object to be processed into the heating furnace or the carrying-out unit that carries the workpiece to the outside of the heating furnace and the loading guide groove and the carrying-out guide groove are provided, it is not necessary to The loading device and the unloading device of the object to be processed provided by other devices simplify the device and reduce the cost.

1‧‧‧ moving into the department

1a‧‧‧Driving guide groove

2‧‧‧ Moving out

2a‧‧‧Driving guide groove

10‧‧‧heating furnace

11‧‧‧ side wall

12‧‧‧ burning device

13‧‧‧ hearth

14‧‧‧Fixed beams

14a‧‧‧Support components

15‧‧‧ Move in

15a‧‧‧Getting started

16‧‧‧Moving out

16a‧‧‧Getting started

17‧‧‧Transportation ditch

18a‧‧‧ Moving into the side wall guide groove

18b‧‧‧ Moving out of the side wall guide groove

20‧‧‧In-furnace conveying device

21‧‧‧Guided track

22‧‧‧Transportation car

22a‧‧‧ lifting device

22b‧‧‧ Lifting and Maintaining Department

22c‧‧‧ Waterway

23‧‧‧ Cooling means

A‧‧‧Processed objects

G‧‧‧ bed surface

Fig. 1 is a schematic longitudinal cross-sectional view showing the longitudinal direction of the heating furnace in the furnace moving device according to the embodiment of the present invention.

Fig. 2 is a schematic longitudinal cross-sectional view showing the direction in which the in-furnace moving device according to the embodiment of the present invention is placed along the width direction of the heating furnace.

Fig. 3 is a schematic longitudinal cross-sectional view showing the longitudinal direction of the heating furnace in the furnace moving device according to the embodiment of the present invention.

In the heating furnace of the above-described embodiment, the lift holding portion provided in the transport vehicle is raised, and the workpiece held on the fixed beam is held on the lift holding portion. Illustrating.

In the heating furnace of the above-described embodiment, the state in which the workpiece is moved to the predetermined position in the conveyance direction of the workpiece while the workpiece is held on the elevation holding portion is shown. Part of the illustration.

Fig. 6 is a view showing a state in which the lifting and lowering holding portion of the transport vehicle is moved to a predetermined position in the heating furnace of the above-described embodiment, and the object to be processed is held on the fixed beam at a predetermined position. Figure.

In the heating furnace of the above-described embodiment, the moving vehicle is moved in a direction opposite to the conveying direction of the workpiece, and the moving vehicle is guided to the position of the object to be conveyed next. Part of the state diagram.

Fig. 8 is a schematic longitudinal cross-sectional view of the transport vehicle in which the two in-furnace moving devices are disposed at predetermined intervals in the conveying direction of the workpiece in the heating furnace according to the embodiment, along the longitudinal direction of the heating furnace. Illustrating.

In the heating furnace of the above-described embodiment, the transfer vehicle is provided with three in-furnace moving devices at predetermined intervals in the conveyance direction of the workpiece, and the workpiece before the heat treatment is carried in. On the side of the loading unit of the heating furnace, the side wall surface guide groove and the carry-in guide groove are provided so as to correspond to the transfer guide groove of the hearth, and the object to be processed which is heated and processed is carried out from the heating furnace. Providing the carry-out side wall surface guide groove and the carry-out guide groove along with the transfer guide groove described above A schematic longitudinal cross-sectional view of the longitudinal direction of the heating furnace.

Fig. 10 is a schematic longitudinal cross-sectional view along the longitudinal direction of the heating furnace in the embodiment shown in Fig. 9.

In the heating furnace of the above-described embodiment, the conveyance vehicle in which three in-furnace moving devices are provided at a predetermined interval in the conveyance direction of the workpiece, and the object to be processed before the heat treatment is shown. The loading side of the loading unit is placed in the loading unit side of the heating furnace, and the side wall surface guiding groove is placed in contact with the conveying guide groove of the hearth, and the object to be processed which is heated and processed is carried out from the heating furnace, and In the case where the conveyance guide groove is provided, a schematic longitudinal cross-sectional view of a state in which the conveyance vehicle is guided to the outside of the heating furnace is provided.

Hereinafter, an in-furnace conveying apparatus and a heating furnace in which the in-furnace conveying apparatus are provided according to an embodiment of the present invention will be specifically described with reference to the drawings. In addition, the in-furnace conveyance apparatus and the heating furnace of the present invention are not limited to the embodiments described below, and those skilled in the art can be appropriately changed without departing from the scope of the invention.

As shown in Figs. 1 to 3, in the heating furnace 10 of the present embodiment, a plurality of combustion devices 12 are provided on the side wall 11, and a predetermined interval is placed on the hearth 13 toward the conveyance direction of the workpiece A. The support member 14a is erected, and the width of the heating furnace 10 orthogonal to the conveyance direction of the workpiece A is provided so as to provide the fixing beam 14 along the conveyance direction of the workpiece A on the support members 14a. A plurality of the aforementioned fixed beams 14 are disposed in a direction at predetermined intervals.

In the heating furnace 10 of the present embodiment, when the workpiece A is sequentially heated, the loading door 15a provided in the inlet 15 of the heating furnace 10 is opened, and the loading unit 1 is moved. The object A before the heat treatment is carried into the heating furnace 10 through the carry-in port 15 so that the object A is held on the fixed beam 14.

Then, the workpiece A held as described above on the fixed beam 14 is heated in the heating furnace 10 by the combustion device 12, and the workpiece A held on the fixed beam 14 is made to be described later. The in-furnace conveyance device 20 is sequentially conveyed to the downstream side in the conveyance direction on the fixed beam 14, and is subjected to heat treatment.

Then, the loading door 16a provided in the delivery port 16 of the heating furnace 10 is opened, and the workpiece A heated as described above is carried out to the unloading unit 2 outside the heating furnace 10 through the delivery port 16.

In the heating furnace 10 of the present embodiment, when the workpiece A held on the fixed beam 14 is sequentially conveyed to the downstream side in the conveyance direction by the in-furnace conveyance device 20 on the fixed beam 14, At a position that does not overlap with the fixed beam 14, a plurality of passes through the hearth 13 of the heating furnace 10 are provided at predetermined intervals in the width direction of the heating furnace 10 orthogonal to the conveying direction of the workpiece A. The transfer guide groove 17 in the conveyance direction of the workpiece A is placed.

Further, in the in-furnace conveyance device 20, a plurality of conveying directions along the conveyance direction of the workpiece A are laid on the bed surface G below the hearth 13 so as to correspond to the respective conveyance guide grooves 17. Guide the track 21, and set a self-propelled cart 22 on each of the guide rails 21, and Further, each of the transport vehicles 22 provided on each of the guide rails 21 is provided with an elevating and holding portion 22b that protrudes upward by the corresponding transport guide groove 17, and that is lifted and lowered by the elevating device 22a.

Then, in the in-furnace conveyance device 20, when the workpiece A held on the fixed beam 14 is sequentially conveyed toward the downstream side in the conveyance direction on the fixed beam 14, as shown in Fig. 4, When the lifting/lowering portion 22b of the transport vehicle 22 is raised to a position higher than the fixed beam 14, the workpiece A held on the fixed beam 14 is held by the lift holding portion 22b.

Then, as shown in FIG. 5, the conveyance vehicle 22 is moved to the predetermined position along the guide rail 21 in the conveyance direction of the workpiece A while the workpiece A is held in the elevation holding portion 22b. The workpiece A held by the elevation holding portion 22b is transported to a predetermined position of the fixed beam 14.

Thereafter, as shown in Fig. 6, the lifting and lowering holding unit 22b holding the workpiece A is lowered to the original position lower than the fixed beam 14 by the lifting device 22, and is held in the lifting and holding portion. The workpiece A of 22b is held above the fixed beam 14 on the downstream side in the conveying direction from the original position.

Then, as described above, the object to be processed A is held by the lifting and lowering holding portion 22b on the fixed beam 14, and as shown in Fig. 7, the transporting vehicle 22 is transported along the guide rail 21 toward the object A to be processed. Moving in the opposite direction, the transport vehicle 22 is guided to the position of the next processed object A. Thereafter, the operation as described above is repeated a plurality of times, and the crucible will remain in Each of the objects A on the fixed beam 14 is sequentially conveyed toward the downstream side in the conveyance direction on the fixed beam 14.

Further, in this embodiment, in order to prevent the elevation holding portion 22b from being excessively heated in the heating furnace 10 to be deformed or damaged, it is cooled. For example, the pipe is bent into a inverted groove shape, and the cooling and holding portion 22b is introduced, and the cooling water is introduced into the water passage 22c formed in the elevation holding portion 22b by a cooling means 23 such as a pump. The 俾 prevents the elevation holding portion 22b from being excessively heated.

Further, in the present embodiment, the transport vehicle 22 that travels by itself is provided on the guide rail 21, but the transport vehicle 22 can be moved along the guide rail 21 from the outside.

Further, in the present embodiment, only one transport vehicle 22 as described above is provided on each of the guide rails 21. However, as shown in Fig. 8, two or more of the guide rails 21 are provided. In the transport vehicle 22 described above, the transport object 22 can be transported by sequentially transporting the workpiece A held on the fixed beam 14 to the downstream side in the transport direction.

In addition, as described above, the workpiece A before the heat treatment is carried into the heating furnace 10 from the loading unit 1 outside the heating furnace 10, and the workpiece A heated in the heating furnace 10 is self-heated from the heating furnace 10. When the unloading unit 2 outside the heating furnace 10 is carried out, in order to use the in-furnace conveying device 20, as shown in FIGS. 9 and 10, the conveying guide groove 17 can be associated with the loading side of the heating furnace 10. In the loading unit 1 , the loading guide groove 1 a is provided, and the loading guide groove 1 a is provided in the loading unit 1 , and the conveying guide groove 17 can be provided on the carrying-out side of the heating furnace 10 . In the manner of carrying out the side wall surface guide groove 18b, the carry-out guide groove 2a is provided in the carry-out unit 2.

In the case where the workpiece A before the heat treatment of the loading unit 1 is carried into the heating furnace 10, the transport vehicle 22 is guided from the heating furnace 10 to the lower side of the loading unit 1, and the transport vehicle 22 is placed. The lifting and lowering holding portion 22b is raised by the loading guide groove 1a of the loading unit 1, and the workpiece A of the loading unit 1 is held by the lifting and holding unit 22b. In the state where the workpiece A is held in the elevation holding portion 22b, the transport vehicle 22 is moved from the loading unit 1 to the heating furnace 10, and the workpiece A held in the above-described elevation holding portion 22b is moved along The loading guide groove 1a is carried into the heating furnace 10 from the loading unit 1 through the loading port 15 and the carrying wall surface guiding groove 18a. Thereafter, the lift holding portion 22b is lowered by the conveyance guide groove 17, and the workpiece A held by the lift holding portion 22b is held by the fixed beam 14 provided in the heating furnace 10.

In addition, when the workpiece A heated and processed in the heating furnace 10 is carried out from the heating furnace 10 to the unloading unit 2 outside the heating furnace 10, the lifting and lowering holding portion 22b of the transport vehicle 22 is raised to be in the heating furnace. The workpiece A heated in the 10 is held in the elevation holding portion 22b. In this state, the transport vehicle 22 is moved from the heating furnace 10 to the lower side of the unloading unit 2, and the elevating and holding unit 22b is moved from the transport guide groove 17 through the carry-out port 16 and the side wall surface guide groove 18b. The carry-out guide groove 2a is moved, and the workpiece A held by the lift holding portion 22b is guided from the inside of the heating furnace 10 to the carry-out unit 2 through the carry-out port 16. Thereafter, the lift holding portion 22b is lowered by the carry-out guide groove 2a. The workpiece A held by the elevation holding portion 22b is held in the carry-out portion 2.

In the above-described manner, the workpiece A before the heat treatment is carried into the heating furnace 10 from the loading unit 1, or the workpiece A that has been heated and processed is carried out from the heating furnace 10 to the loading unit 2 It becomes easy to carry out.

In addition, as described above, the side wall surface guide groove 18a and the carry-in guide groove 1a are provided on the loading side of the heating furnace 10 so as to correspond to the conveyance guide groove 17, and the side wall surface guide groove is provided on the carry-out side of the heating furnace 10. 18b and the guide groove 2a for carrying out, and when the conveyance vehicle 22 is guided to the outside of the heating furnace 10, even if the heating furnace 10 is stopped without cooling, maintenance and/or repair of the conveyance vehicle 22 etc. can be performed. In addition, the loading unit 1 and the carrying-out unit 2 for the loading guide groove 1a and the carrying-out guiding groove 2a are provided, and the transporting vehicle 22 is protected from the scale falling from the workpiece A before and after the heating, or The effect of the effects of the heat radiated.

In addition, as shown in FIG. 11, the loading unit 1 and the carrying-out unit 2 in which the loading guide groove 1a and the carrying-out guiding groove 2a are provided can be omitted, and in this case, the transporting vehicle 22 can be enlarged. The maintenance space when taken out to the outside of the heating furnace 10 makes it easier to maintain or repair or replace the transport vehicle 22 and the like.

1‧‧‧ moving into the department

2‧‧‧ Moving out

10‧‧‧heating furnace

11‧‧‧ side wall

12‧‧‧ burning device

13‧‧‧ hearth

14‧‧‧Fixed beams

14a‧‧‧Support components

15‧‧‧ Move in

15a‧‧‧Getting started

16‧‧‧Moving out

16a‧‧‧Getting started

20‧‧‧In-furnace conveying device

21‧‧‧Guided track

22‧‧‧Transportation car

22a‧‧‧ lifting device

22b‧‧‧ Lifting and Maintaining Department

23‧‧‧ Cooling means

A‧‧‧Processed objects

G‧‧‧ bed top

Claims (9)

An in-furnace conveying device is provided with a plurality of fixing beams along the conveying direction of the workpiece at a predetermined interval in a direction orthogonal to the conveying direction of the workpiece, and facing the object to be processed A plurality of transport guide grooves that penetrate the hearth along the transport direction of the workpiece are disposed at a predetermined interval in a direction orthogonal to the transport direction, and are directed along the transport guide groove below the hearth. The transport vehicle that travels in the transport direction of the processing object is provided with an elevating and holding portion that is raised and lowered by the transport guide groove and protrudes upward, and the in-furnace transport device raises the lift holding portion provided in the transport vehicle to be held in the foregoing The object to be processed of the fixed beam is held by the lift holding portion, and the transport vehicle is moved to transport the workpiece held by the lift holding portion to a predetermined position of the fixed beam. The in-furnace conveying device according to the first aspect of the invention is provided with a cooling means for cooling the lifting and lowering holding portion that holds the workpiece. The in-furnace conveying apparatus according to the first or second aspect of the invention, wherein the transporting vehicle system is provided in a plurality of directions in a direction orthogonal to a conveying direction of the workpiece, corresponding to each of the conveying guide grooves. The in-furnace conveying apparatus according to the first or second aspect of the invention, wherein the conveying means is provided in a plurality of positions at a predetermined interval in a conveying direction of the workpiece. A heating furnace is provided with an in-furnace conveying device as described in claim 1 or 2. A heating furnace as described in claim 5, wherein The processing object is carried into the loading unit side of the heating furnace in the heating furnace, and the side wall surface guiding groove is provided so as to correspond to the conveying guide groove, and the conveyance vehicle is guided to the loading unit by the loading side wall surface guiding groove. The outside of the heating furnace on the side. The heating furnace according to the sixth aspect of the invention, wherein the loading portion for carrying the workpiece into the heating furnace is provided with a guiding groove for the loading guide groove and the loading side wall surface guiding groove. The lifting and lowering holding portion provided in the transporting vehicle is lifted by the loading guide groove, and the object to be processed in the loading portion is held by the lifting and lowering portion, and is held by the loading guide groove and the side wall surface guiding groove. The workpiece in the lift holding portion is carried into the heating furnace. The heating furnace according to the fifth or sixth aspect of the invention, wherein the carrying-out side of the heating furnace outside the heating furnace is carried out, and the carrying-out side is provided corresponding to the conveying guide groove. The wall guide groove guides the groove by the carry-out side wall surface guide, and guides the transport vehicle to the outside of the heating furnace on the carry-out portion side. The heating furnace according to the eighth aspect of the invention, wherein the unloading guide groove is provided in a carry-out portion that carries the workpiece to the outside of the heating furnace so as to correspond to the transport guide groove and the carry-out side wall guide groove. The object to be processed held in the elevating and holding portion of the transport vehicle is carried out to the outside of the heating furnace through the carry-out side wall surface guide groove and the carry-out guide groove.