JPS5812983A - Continuous heating furnace - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a continuous heating furnace.

Various types of continuous furnaces are known for heat treatment such as brazing, such as a belt conveyor type, a bushing set, and a walking beam type. Because it is a continuous tunnel, it is difficult to perform precise gas and temperature control, and the heating schedule is difficult because the transfer method simply advances the workpiece at a fixed pitch at fixed intervals. Or, there is little flexibility in the heating cycle, and the workpieces in the furnace are individually heated rapidly or slowly, or the heating time is lengthened or shortened, or the heating cycle is preheated again. There was a disadvantage that it was not possible to obtain 1. Furthermore, since shocks and vibrations are applied to the workpiece during heating, which is the most important step in heat treatment, there is a problem in that, in addition to the aforementioned difficulties in temperature and gas control, precise heat treatment such as brazing cannot be performed.

The present invention eliminates the disadvantages of the conventional continuous heating furnace described above, and enables heat treatment by feeding the workpiece in tact while maintaining the independence of the atmosphere and temperature of each zone of preheating, heating, and cooling. The workpiece can be heated in a unique and free surface pattern that is separated from the preheating process without applying unnecessary shock or vibration to the workpiece, allowing for a wide variety of heating schedules that can be quickly adapted to various heat treatments. The aim is to provide a continuous heating furnace that can

In order to achieve this object, the present invention provides a preheating furnace having shutters in front and rear of the inlet, and also provides vertical heating through a lower chamber to this horizontal preheating furnace, so that the other side of the lower chamber is provided with a horizontal cooling chamber and an outlet section, and a trolley mechanism that can move freely and move up and down is arranged in the zone extending from the start end of the preheating furnace to the start end of the cooling chamber. The material to be processed can be moved freely between the lower chamber and the cooling chamber, and a 7-wheel lifter is disposed in the lower chamber in a relationship that intersects with the cart mechanism. In this book, the heating furnace is charged and extracted at different speeds and times, and the heated workpieces are placed in a cooling chamber where they are cooled while being transferred by a nine-tact feeding mechanism.

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

1 to 8 show an embodiment of a continuous heating furnace according to the present invention. Reference numeral 1 indicates a cylindrical inlet portion, and an opening T is formed at the bottom as shown in FIG. A charging mechanism 8 consisting of a lifter LF1 and a pusher P2 is provided directly below and at the end on the inlet side. A shutter 811 is provided at an intermediate position of the inlet portion 1, and the shutter 8H1, the lid plate 21 of the lifter LF1, and the gas inlet/outlet portion 22 constitute an inlet/exchange chamber 9.

Reference numeral 2 denotes a preheating furnace installed at right angles to the axis of the inlet section 1, which has a front chamber 10 communicating with the end of the inlet section 1 as shown in FIG. A tunnel-shaped preheating chamber 11 is formed. Shutters 812.8H3, which are raised and lowered by cylinders, are provided at the front and rear parts of the preheating chamber 11, respectively, and these shutters separate the preheating chamber 11 from the inlet 1 and the heating furnace, which will be described later. A predetermined atmosphere is created by the gas introduction section 23.

-3 is a vertical heating furnace installed above a lower chamber (or cylinder chamber) 12 connected in series with the preheating furnace 2, and inside is surrounded by a refractory and nine heating chambers 13 are formed. A half-shaped shutter 8H4 is installed between the heating chamber 13 and the lower chamber 12.
゜8H4'-6ERnbh, 3゜shi'ya77 SH4,
The crystal/resistance constant heating chamber 13 is separated from the lower chamber 12. A main gas introduction part 24 is provided on the ceiling of the auxiliary chamber 13, a heater 25 is attached to the inner wall, a peephole 26 is fixed to the side, and the peephole 26 and the shutter guide tube each have a gas inlet 24. An introduction section is provided.

4 is a cooling chamber which communicates at right angles with the lower chamber 12 with a rear chamber 14 as shown in FIG. 3, and thereafter extends parallel to the inlet portion 1 as shown in FIGS. to the 7th
As shown in the figure, the outlet portions 5 are arranged in a row at right angles. The cooling chamber 4 has a tunnel structure whose outer periphery is surrounded by a water cooling jacket 27, and a gas supply pipe 28 with a shower hole for atmospheric gas is inserted into the top of the tunnel. An inlet pipe 29 and an exhaust pipe 30.30 are led to the lower part, and these inlet pipe 29 and exhaust pipe 30.30 are connected by a circulation system equipped with a cooler 31 and pipes 3 and 2. .

H! discharged from the gas supply pipe 28! gas etc.
By regenerating the IC (refrigerant gas) and sending it to the cooling chamber 4, the amount of gas used is reduced.

The outlet part 5 has a horizontal cylindrical shape as shown in FIG. A pusher P5 is provided at the boundary of the cooling chamber 4 for transferring the object to be processed onto the lid LF4, and these pushers P5
An extraction mechanism 16 is constituted by the lifter LF4 and the lifter LF4. A shutter SH5 is provided in the middle of the exit section 5,
The shutter SH5 and the cover plate 21 of the previous lifter constitute an exit replacement chamber 17.

6 is a conveyor provided from the side of the outlet section 5 to the side of the entrance section 1, and has an open lower conveyor.

As shown in FIGS. 2 and 8, pushers P1. P6 is provided.

Reference numeral 18 denotes a horizontally elongated atmosphere box that is installed in series along the F direction of the front chamber 10 or 5 or the rear chamber 14. A cart mechanism 19 is built in which is movable and movable up and down for moving the preheating chamber 1j1 to the lower chamber 12 and the post-work chamber 14.

As shown in FIGS. 9 to 11, the trolley mechanism 19 includes a base plate (underframe) 33 disposed over almost the entire length of the atmosphere box 1B, and a base plate 33 that extends back and forth along the longitudinal direction of the base plate 33. The left and right parallel carts 34, 34 move forward, and the support plates 3 whose base ends are fixed to the parallel carts 34, 34, respectively.
5.35. Therefore, the base plate 33 is a lifter LF2. whose longitudinal ends at least penetrate the atmosphere box 1B. LF2', and the lifters LF2. The lifter LF2. It is possible to move up and down by operating LF2'.

In this embodiment, both sides of the longitudinally intermediate portion of the base plate 33 and the inner bottom of the atmosphere box are connected by means of the 7-piece mechanism 36, 36', so that the intermediate portion is also supported.

The base plate 33 has horizontal shafts 37.3 at the front and rear ends and at various places in the middle.
7', 37" is installed, and the horizontal axis at the front and rear ends is 37.37'.
has two main sprocket wheels 38.
38' are attached, and small sprocket wheels 39 are attached to the horizontal shafts 37'' at various intermediate points, and chains 40 and 40 are suspended around these sprocket wheels.
A portion of the chain 40.40 is connected to the axle 41.41 of the parallel truck 34.34. On the upper surface of the base plate 33, there are several sets of guide rails 42.4 along the longitudinal direction.
2 is laid, and wheels 43.43 rolling on guide rails 42.42 are provided on axles 41.41 of parallel bogies 34.34, respectively. Further, a conduction sprocket wheel 44 is attached to the horizontal shaft 37' of one main sprocket wheel 38', and a main shaft 45 extending outward from the atmosphere box 18 is provided at a position corresponding to the conduction sprocket wheel 44. A driving sprocket wheel 47 communicating with the prime mover 46 and a driven sprocket wheel 48 transmitting the driving force to the transmission sprocket wheel 44 are attached to both ends of this main shaft 450, and the driven sprocket wheel 4B and the transmission sprocket wheel 44 are connected to each other.
An IS wheel 49 is installed between the base plates 3 and 49 to maintain a constant tension even when the platform 3 is raised and lowered.
In order to enable the parallel carts 34 and 34 to move forward and backward manually, a subshaft 50 with a handle is installed parallel to the main shaft 45.
is provided, and the sub-shaft 5o and the main shaft 45 are connected by a sprocket and a chain.
In order to be able to detect the position of 4.34 from the outside, a detection shaft 51 parallel to the sub-shaft 5o is provided outside the atmosphere box 18, and a detection sprocket wheel 1 is attached to these two shafts. A detection chain saw ss to which a bogie position detector 54 is fixed is suspended.

The support plates 35 and 35 are parallel as before, and their base ends are fixed to the trolleys 34 and 34, and their base ends face each other with a predetermined space between them. As shown in Fig. 4, the bottom of the preheating furnace 2 is formed with a slit 56, 56 that allows the support plate 35, 35 to pass through, and the refractory between the sills 56, 56 penetrates the base plate 33. It is supported by pillar 57.

In order to support the workpiece, a front chamber 10 and a preheating chamber 11 are provided.
Fixed abutments 60, 61, 62 are provided in the rear chamber 14 at the same height level, respectively.
．． 35 is kept at a slightly lower level than the fixed abutment 6G and 61.62 under normal conditions, and when the base plate 33 rises, the fixed abutment 1
It is set to a higher level than 1G, 61.62. Phototubes PH1 to PH3 are provided at the fixed abutment 61 of the preheating chamber and at the position of the lid abutment to be described later.

Vertically above the heating chamber 13 is a heating furnace glue 7ter LF3.
is installed vertically, and has a cylinder 63 provided in the pit and a rod 64 that is raised and lowered by the cylinder 63, and the rod 64 is the tenth cylinder.
As shown in the figure, the rod extends between the support plates 35 and 35 through an opening 65 provided in the base plate 33, and the carriage mechanism 19 is attached to the upper end of the rod.
The support 66 is fixed to support the object to be processed. A rod 65 is provided at the center of the contact portion of the shutters SH4 and SH4' when the abutment rises to the heating chamber 13.
A seal portion 67 that surrounds the outer periphery of and blocks the rest of the
．． 67 are provided.

20 is a tact feeding mechanism provided in the cooling chamber 4, and as shown in FIGS. 6 and 12 to 14, there is a pusher P3 provided at the side end of the rear chamber 14, and a related position opposite to this pusher P3. A pusher P4 provided in the cooling chamber 40 and a pusher P4 provided in the recess 68 formed in the paper of the cooling chamber 40.
A cart with rollers 6S moves back and forth with a predetermined stroke by being connected at one longitudinal end to an operating rod, and nine one-way removable pawls 70 are attached to the cart with rollers 69 at regular intervals.
It is equipped with The one-way rotatable pawl 70 is configured so that when the cart 69 with rollers moves toward the starting end of the cooling chamber, it falls down to the level of the cart, and when it moves in the opposite direction, it stands up due to the weight T1 and the stopper 72. ing.

Note that the lifters LF1. LF
4 in detail, those lifters LFl, L
As shown in FIG. 15, P4 consists of a lifting rod T3, a lid plate 21, and a connecting body 74 that connects them.
It has a pressing protrusion 76 in contact with, and a support base T7 is fixed to the center of the upper surface. The packing wears out with use, and if the level of the support base T7 changes accordingly, the object to be processed will collide or fall, making smooth transfer impossible. This abutment 7
In order to always align the pressure ridges 7 with the levels of the inlet portion 1 and the outlet portion 5, and to ensure that the pressing ridges are brought into close contact with the packing 75 for good sealing, the present invention has a connecting body 74 as shown in FIG.
An elongated hole 78 is formed in and a bottle T9 is connected to the upper end of the elevating rod 73 through the elongated hole T8, so that the cover plate 21° can be raised and lowered by a small amount within the elongated hole.

In other drawings, 80 is a water cooling jacket provided outside the lower chamber, 81 is an exhaust section provided at the bottom of the atmosphere box 81, and 82 is a limit switch group 1.83 for inching operation.

Reference numeral 83 denotes a gas introduction section provided in the shutters SH2 and SH3.

Next, the usage situation of the connected heating furnace of the present invention will be explained.

When performing heat treatment such as brazing in the main furnace,
A workpiece W, which is a combination of parts to be brazed and a brazing material, is set on a base plate or tray W and placed on a conveyor 6. As a result, the workpiece W is transferred to the inlet section 1, and when the tray W comes into contact with the limit switch placed at the same position, the pusher P1 is actuated, and the workpiece W is transferred to the lifter LFI.
It is moved to the support stand 7T.

Subsequently, lifter LF1 rises, causing damage.
! 'The processed material is charged into the inlet section 1 from the upper open lower part, and at the same time the open lower part is closed by the lid plate 21 of the lift 4-LFI, so an inlet exchange chamber 9 is created and the atmosphere is replaced by the gas inlet/outlet part 22. .

After a certain period of time, shutter SH1 is opened,
Subsequently, the pusher P2 is activated, thereby pushing the object W to be processed.
is placed on a fixed abutment 60 in the front chamber 10. When this movement is detected by the limit switch, the limit switch LF2. LF
2' is activated, and the base plate 33 is floated from the lowered position to the raised position, and as the base plate 33 rises, the parallel carriage 3
4.34 is lifted by the same amount and the prop plate 35.3 is raised.
5, the workpiece W is floated from the fixed support 60.

When this operation is detected, the shutter SH2 is raised,
Along with that, Dynamic 4! i! When 41i is started, the system procerato group rotates and the chain 40° 40 moves, so the parallel carriages 34, 34 and the support plates 35, 35 start moving forward along the base plate 33, and the object W to be processed moves along the support plate 35. It enters the preheating chamber 11 while being supported from below by .35. When the object to be processed reaches the position where it blocks the phototube P)11, the rotation of the sprocket group stops, so the parallel carriages 34, 34 stop, and then the lifters LF2. LF2' operates to lower the base plate 33. Thereby, the object W to be processed is placed on the fixed support 61. Then, when the sysprokerato group is reversed again by the prime mover 46, the support plate 35.degree. 35 is kept at a lower level than the fixed abutment 61 and retreats from the preheating chamber 11 to the front chamber 10, where it waits.

When the next workpiece W reaches the front chamber 10 in the previous procedure, the platform 33 rises to support the workpiece W on the support plate 35.35, and the parallel carriage 34.34 By advancing, it is moved to the fixed support 61 of the preheating furnace 2. The shutter SH2 descends as the object passes through it, and separates the preheating chamber 11 from the outside to maintain a good atmosphere.
As shown in the figure, it is placed on fixed supports 61, 61' and preheated to a predetermined temperature in a wing state.

In this way, after a certain preheating time, the parallel truck 3'
4.34 moves forward on the base plate in the lowered state, and the fixed base 6
Stop at the bottom of 1'.

Next, lifter LF2. When the base plate 33 of LF2' rises, the object to be processed W is supported by the support plate 35.35, and then the parallel carriage 34°34 moves forward in parallel with the opening of the shutter 8H3. The object to be processed W is loaded into the lower chamber 12, and the parallel carriages 34 and 34 are stopped and the platform 33 is lowered by the phototubes and corresponding limit switches. As a result, the workpiece W to be removed is transferred to the support base 66 of the lifter LF3. At this time, shutter SH3 is already closed.

When the workpiece W has been moved in this way, the parallel trolley 34
．． 34 immediately retreats and stops below the workpiece W remaining in the preheating chamber 11, and protrudes into the preheating chamber due to the rise of the platform 33, causing the workpiece W to float away. Then, the parallel cart 34.34 moves forward to the empty fixed support 61.
After the object to be processed is transferred to the position 10, it is lowered by the base plate 3, and then retreats to the front vehicle 1o to wait for the next object to be processed.

On the other hand, the workpiece preheated as described above is transferred to the lifter LF.
When the lifter LF3 is placed on the support base 66 of No. 3, it starts to rise and stops when it reaches just below the shutters SH4, SH4'.
' opens.

After the heating chamber 13 is thereby opened, the lifter LF3 starts to rise, and the workpiece W enters the heating chamber from the lower end opening.

During this time, the object to be processed is preheated and its temperature is increased. Then, at the same time as the lower end of the object to be processed passes through the shutter SH4°8H4', the shutter 8H4°SH4' closes, leaving only a small gap around the outer circumference of the Shirorad due to the seal portion 67.67 formed on the abutting surface. The heating chamber 13 is cut off from the lower chamber 12. During this time, the lifter LF3 continues to rise and stops rising when it reaches a preset level of -,1. 11L' heating chamber 13 is divided from the lower chamber 12 as mentioned above, and atmospheric gas such as H gas is supplied from the main gas introduction section 24. It flows downward through the gap between the rods. Therefore, heating is performed under favorable conditions with uniform temperature distribution and gas distribution, and without shock or vibration. In addition, since there is a viewing tube 26, it is easy to inching the lifter LF3 according to the size of the workpiece while looking at it. Since the movement is performed independently from the movement by the second carriage mechanism 19, it is possible to set a free temperature schedule. In other words, by simply controlling the operation of the 7-star LF3 using a limit switch, you can perform rapid heating, slow heating,
Long-time heating and short-time heating can be performed freely. Note that the lifter LF3 has a parallel truck 34°34 and a support plate 35.
35, so it does not interfere with their running.

When the heating is completed as described above, the lid LF3 is lowered and stopped directly above the shutters SH4 and SH4' to gradually cool down, and then the shutter SH4 and SH4' are gradually cooled.
4. When SH4' is opened, it is moved to the lower chamber 12.

When this movement is confirmed, the parallel carts 34 and 34 move forward again, pick up the workpiece W supported by the lid LF3, and transfer it to the fixed support 62 in the rear chamber 14.

When the transfer is completed, the parallel cart 3 moves along the lowered platform 33.
4.34 moves backwards, places the workpiece in the preheating chamber 11 on the support 66 of the lifter LF3 in the same manner as described above, then moves the other workpiece in the preheating chamber 11 to the right, and places the workpiece in the preheating chamber 11 to the right. A workpiece to be processed is charged into the preheating chamber 11.

On the other hand, when the limit switch detects that the workpiece W is placed on the fixed support 62 of the rear chamber 14 as described above, the pusher P3 is activated to push the workpiece W into the cooling chamber 4. . As a result, the object W to be processed is transferred to the cart 69 with rollers waiting in the cooling chamber 4, and is cooled by the cooling gas injected from the gas supply pipe 28 and the water cooling jacket. The pusher P4 is operated during ' until the next object to be processed is placed on the fixed support 62, and this operation causes the cart 69 with rollers to move a certain distance along the recess 68, and at that time, it is raised up. The object to be processed is moved forward in the cooling chamber by the one-way rotatable claw 70.

When this operation is repeated sequentially for the subsequent objects to be processed and the objects to be processed are sent to the rear end of the cooling chamber 4, the button shear P5 (by the limit switch) is actuated to transport the objects to the outlet section 5.
move it in the direction of In the meantime, the lifter LF4 rises, and the opening 15 of the bottom part 5 is pushed out by the cover plate 21 at the upper end of the stator.
is sealed. This hermetic seal constitutes the outlet replacement chamber 1T, which has a predetermined atmosphere such as N or gas. Next, the shutter 5I (when the shutter 5 is opened, the object to be processed is transferred to the output replacement chamber 1).
11 people are put on the device and shutter S! -15 Lifter LF4 after closing
The material to be processed is extracted by the lowering of the material.

The extracted object to be treated is then transferred to the conveyor 6 by a pusher P6, and is removed from the plywood at an arbitrary position on the conveyor 6 and taken out.

Although the above is a standard operating situation, in the present invention, since the trolley machine 41119 and the lid LF3 are operated independently, the workpiece heated in the heating chamber 13 is returned to the preheating chamber 11 and heated to a low temperature. After heating, it is charged into the cooling chamber 4, or after being heated at a low temperature, it is placed in a heating furnace and heated again at a high temperature.It can be used for any heating cycle, and these can be easily done by setting a program using a limit switcher phototube, etc. It can be implemented.

According to the present invention as described above, the workpiece can be continuously heat-treated while maintaining the independence of the atmosphere and temperature of each zone of preheating, heating, and cooling. A vertical heating chamber is formed between the cooling chamber and the lower chamber, and the workpieces to be processed are moved from the preheating chamber to the cooling chamber using a cart mechanism that can move freely and move up and down. Transfer between heating chambers and holding the position in the heating chamber are performed using a lifter that does not interfere with the movement of the trolley mechanism, so the workpiece can be heated according to its own temperature schedule, separated from the preheating process, and the heating Preheating and preheating can be repeated freely, making it possible to implement a wide variety of heat cycles that can quickly respond to various heat treatment purposes. Furthermore, like a normal tact feed furnace, there is a so-called push-push raft.
Since the object to be processed is not heated, unnecessary shocks and vibrations are not applied to the object to be processed. Therefore, excellent effects such as heat treatment such as precision surface brazing can be obtained with ease of optimizing both temperature and atmosphere conditions.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an embodiment of a continuous heating furnace according to the present invention, Fig. 2 is a cross-sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a cross-sectional view taken along the line ■-■ in Fig. 1. Figure 4 is a sectional view of the preheating furnace in Figure 1, Figure 5V is a sectional view of the heating furnace in Figure 1, Figure 6 is a sectional view taken along the line Vl-Vl in Figure 1, and Figure 7 is a sectional view of the heating furnace in Figure 1. Figure 1 is a cross-sectional view taken along the line ■-■, Figure 8 is a cross-sectional view taken along the line ■-■ in Figure 1, Figure 9 is an enlarged view of Figure 3, Figure 10 is an enlarged view of Figure 5, Figure 11 is a perspective view showing the drive system of the truck mechanism, Figure 12 is a cross-sectional view of the cooling chamber and outlet section in Figure 1, Figure 13 is a rear view of the truck with rollers in the cooling chamber, and Figure 14 is a cross-sectional view of the truck with rollers in the cooling chamber. The figure is a side view, FIG. 15 is a front view showing the lift mechanism of the inlet and outlet sections, and FIG. 16 is a partially enlarged view thereof. 1... Inlet part, 2... Preheating furnace, 3... Heating furnace, 4
...Cooling chamber, 5...Outlet section, 8...Charging mechanism, 1
2... Lower chamber, 16... Extraction mechanism, 18... Atmosphere box, 19... Cart mechanism, 20... Tact feed mechanism, 21... Lid plate, 33... Base plate , 34.34
... Parallel truck, 35.35 ... Support plate, 4o, 4
0...Chae/, 42.42...Guide rail, 4
3.43...Wheel, 66...Abutment, 69...Dolly with rollers, Tσ...One-way rotating pawl, 73...Elevating rod, T4...Connection body, 77...・・Abutment, LFl
, LF2. LF2', LF3. LF4...
Lifter, SH2, 8H2', SH4, SH4'・
...Shutter patent applicant Yamazaki Electric Industry Co., Ltd. Figure 2 1! ; 7 Figure 4 Figure 57 Figure 5 Figure 15 ``A Figure 16 procedural amendment name included) Showa! 1-Month J, 2017 Director General of the Patent Office Shima 1) Haruki, Patent Office Examiner, 1, of the case. Indication: 1961 Patent Application No. 110.3-0 No. 3, Relationship with the case of the person making the amendment Patent Applicant: Yamazaki Electric Industry Co., Ltd. 4, Agent: 10II, Kyobashi, Chuo-ku, Tokyo / Shimome llI No. S No. Tsuchiya Building Telephone 344!-394za6, Subject of amendment Drawing (plan)

Claims (5)

[Claims] (1) A main preheating furnace 2 having shutters 8H2°SH3 in front and behind the inlet portion 1 is provided, and a vertical heating furnace 3 is provided at the end of the preheating furnace 2 via a lower chamber 12, and further Following the heating furnace 3, a horizontal cooling chamber 4 and an outlet section 5 are connected, one end of which is connected to the lower chamber 12, and a material loading mechanism 8 and an extraction mechanism are connected to the inlet section 1 and the outlet section 5. 16, and in the zone extending from the starting end of the preheating furnace 2 to the starting end of the cooling chamber 4, there is a cart mechanism that can move freely and move up and down to move the workpiece into the preheating furnace, the lower chamber, and the cooling chamber. 19, and shutters 8H4 and 8H4 are installed at the boundary between the heating furnace 2 and the lower chamber.
', a lifter LF3 is provided in the lower chamber 12 at a position intersecting with the trolley mechanism 1B, and a tact feeding mechanism 20 is provided in the cooling chamber 4. (2) The trolley mechanism 19 is arranged along the horizontally long atmosphere box 1B provided along the lower region of the preheating furnace, the lower chamber, and the starting end of the cooling chamber, and the atmosphere box 18 is disposed over almost the entire length of the atmosphere box 18 and extends at least at both ends. Lifter LF2. LF2'
Several sets of guide rails 42 are supported on the upper surface by
．． 42 is fixed to a base plate 33, wheels 43.43 are connected to the guide rails 42, 42 of the base plate 33, and a chain 40.43 is suspended from a sprocket wheel attached to the base plate 33.
40 and parallel carts 34.34 that move back and forth on a base plate, and support plates 35.35 erected on the parallel carts 34.34 with a predetermined space between them. Continuous heating furnace according to scope 1. (3) The lower chamber lid LF3 has a rod 64 that passes through an opening 65 formed in the base plate 33 and extends between the support plates 35 and 35, and the upper end of this rod is provided with a support for the workpiece. 6
The continuous heating furnace according to claim 1, wherein the lower chamber 12 is shut off by shutters SH4 and SH4' when the rod 64 is raised into the heating furnace. (4) Charge mechanism 8 and extraction mechanism 16 of inlet section 1 and outlet section 5
are each equipped with lifters LFI and LF4, and those 7
Tar LF1. LF4 includes a lifting rod T3, a cover plate 21 having a pressing protrusion T6 for the opening gasket in the outer area and a support T7 fixed in the inner area, and lifting rod T3 with respect to the cover plate 21 in the height direction. 2. The continuous heating furnace according to claim 1, further comprising a connecting body 74 that is connected with an appropriate amount of play. (5) The tact feeding mechanism 20 includes a pusher P3 at the cooling chamber side end and a pusher 7 provided at a position facing the pusher P3.
y-Y-P4 and a cart with rollers 6s which is arranged in a recess at the bottom of the cooling chamber and moves back and forth by the operating rod of the pusher P4.
The continuous heating furnace according to claim 1, comprising: and unidirectionally rotatable pawls TO attached at regular intervals to the roller-equipped cart 69.