JPS5824485B2 - Walking conveyor type heat treatment furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a walking conveyor type heat treatment furnace.

In particular, the present invention provides a heat treatment furnace for heat treating steel plates, etc.
The conveyance means for processing materials such as steel plates is composed of an elevating beam and a forward and backward conveyor, which facilitates the transfer of processing materials into and out of the furnace. The present invention relates to a walking conveyor type heat treatment furnace that simplifies the supporting means and enables efficient heat treatment.

Conventional heat treatment furnaces generally employ a roller conveyor as a means for conveying the material to be treated within the furnace, but such roller means has the following problems.

That is, the manufacturing cost of the rollers is high, and since the rollers are installed across the furnace width direction, the furnace width is restricted due to the manufacturing length of the rollers, and therefore the width of the processing material is restricted.
An extremely large number of rollers is required, and double the number of support means such as bearings are required on the left and right sides, making it necessary to install each roller on the side wall of the furnace, which makes manufacturing the furnace complicated and expensive, and requires a large number of side walls of the furnace. It is difficult to seal the support means of
There are problems such as the large opening area of the furnace side wall, large heat loss, and poor thermal efficiency.

The rollers are also heated in the furnace together with the processing material, causing expansion and contraction in the axial direction and thermal distortion in the direction perpendicular to this.Repetition of this will shorten the life of the rollers, and the rollers must be inspected regularly. In addition to requiring replacement, which is troublesome and complicated in terms of maintenance, it is also difficult to configure the bearing to allow the roller to expand and contract in the axial direction, and to perform sealing while maintaining this.

Further, when the material to be treated is conveyed by means of rollers, the heated material to be treated is fed while being rubbed by the rollers, which causes scratches on the surface of the material to be treated, which impairs the marketability of the material to be treated.

Therefore, instead of the means for conveying the material to be treated using the rollers of the heat treatment furnace, a means for conveying the treated material using a walking beam has been proposed.

The walking beam type conveyance means has a plurality of beams arranged in parallel, each beam is systemized into a plurality of groups, and each group is shifted in phase to perform a combined movement of vertical movement and back-and-forth movement.
The material receiver transfers the material and sends the material when the height levels of adjacent sets of beams arranged in parallel are synchronized.

Although this walking beam method has the advantage of a simple structure, it is difficult to carry the material into the furnace.

During unloading, the loading and unloading sides are roller conveyors, making it difficult to smoothly transfer materials.Also, while the walking beam is in horizontal motion, the roller conveyor is in rotary motion, so the conveyance speed of both sides is low. It is difficult to match the materials, and it is difficult to adjust the conveyance speed, such as by fast forwarding the materials to be processed.

Further, due to the difficulty in adjusting the conveyance speed, when a heat treatment line including a heat treatment furnace is configured, it is difficult to adjust the feed rate of the entire line and the feed rate within the furnace, which is inconvenient in terms of line configuration.

Furthermore, in the walking beam method, it is necessary to provide a large number of openings in the hearth to allow the beam support member to move back and forth.
The number of openings in the hearth is large and large, which causes heat loss in the furnace, and the sealing means for these is complicated as it requires a water tank, etc., and the scale of the processing material falls into the water seal. There are also problems such as the need for removal means and the like.

In view of the above-mentioned problems in conventional heat treatment furnaces, the present inventors have developed the present invention in order to effectively solve the problems.

The object of the present invention is to provide a heat treatment furnace for heat treating steel plates, etc., in which the means for conveying the treated material is composed of two systems: an elevating beam and a forward and backward conveyor, and the speed of conveying the material in the furnace and the conveyance of the next process are adjusted. A walking conveyor that allows you to freely adjust and set the speed, loading speed, and even the conveyance speed when heating the material. Similar to the roller conveyor type, the walking conveyor transfers the material in and out of the furnace, making the conveyance smoother. Provides heat treatment furnaces.

Further, the object of the present invention is to achieve the above without using a single roller means, to simplify the structure, to reduce various equipment costs and maintenance costs as much as possible, to achieve excellent economic efficiency, and to provide a set of rollers and To provide a walking conveyor type heat treatment furnace which minimizes heat loss in the furnace side wall and hearth like a double walking beam type, has good thermal efficiency, and is effective in utilizing thermal energy.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

Figure 1 is a side sectional view of the furnace according to the present invention, and Figure 2 is a side sectional view of the furnace according to the present invention.
3 is an enlarged view of the portion indicated by arrow 3 in FIG. 1, FIG. 4 is a sectional view taken along line 4-4 in FIG. 3, and FIG. 5 is an explanatory diagram of the conveyor drive system.

The furnace 1 is long in the front and back, and as shown in FIG. It can be opened and closed freely.

Heating burners 4 are provided on the ceiling 1a and left and right side walls 1b and 1c of the furnace 10, and at the front and rear of the furnace 1,
Rollers 7.7 are provided which communicate with an input roller conveyor 5 and an output roller conveyor 6 provided inside and outside the furnace.

An upper truck 8 is provided outside the bottom of the hearth 1d, a lower truck 9 is provided below the upper truck 8, and wheels 10, 11, etc. are provided above and below the lower truck 9 in the length direction. It is laid out appropriately,
The upper wheels 10... are movably in contact with the lower surface of the upper truck 8, and the lower wheels 11... are placed on the inclined surface of the inclined table 12....

The upper truck 8 and the lower truck 9 form a pair, and this truck is divided into two systems 8A, 8B, 9A, and 9B.

The lower carts 9A, 9B of each system are connected to separate lifting cylinder devices 13A, 13B, and the strokes of the lower carts 9A, 9B move up and down due to the rolling of the wheels 11 on the ramp 12, and each cylinder device 13A, 13B is separately operated. The upper carriages 8A and 8B are made to move only up and down alternately.

A plurality of columns 14 are erected in the length direction and width direction of the furnace 1 on the upper carts 8A, 8B, and 14A, 14B... are provided for each system of the carts of the columns, This pillar 1
4A, 14B... are openings 1e provided in the hearth 1d.
... is projected into the furnace chamber S.

The opening 1e... is set to a size that allows sufficient sliding of the pillars 14A, 14B... since they only move up and down.
A metal bellows 15 is interposed between the bottom of the opening 1e and the top surface of the upper carts 8A, 8B so as to surround the outer periphery of this part of the support columns 14A, 14B, and seal the opening 1e. do.

At the upper end of these pillars 14A, 14B... is a cart 8A.

Support beams 16... are provided parallel to the above-mentioned carts 8A, 8B...
According to ..., the beams 16A, 16B... are divided into two systems, and the beams 16A, 16B of different systems are adjacent to each other.
They are provided alternately every other time, and are provided in the furnace chamber S in parallel in the length direction.

Beam 16A. Guide parts 16a and 16b are provided at the front and rear ends of 16B and are bent downward, and the lower ends of these parts pass through the hearth 1d and are connected to the front and rear ends of the carts 8A and 8B. The extension part is surrounded by metal bellows 15 and sealed.

The support beams 16... are formed in the shape of a hollow box as shown in FIGS. 3 and 4, and contain a cooling medium 17 inside, and are covered with a refractory material 18 except for the upper surface. The side pieces 16c are spaced apart from side to side.

16c is erected in the length direction to support the upper side of the refractory 18, and a groove 1 is formed in the length direction between the side pieces 16c, 16c.
9, and this concave groove 19 is provided except for the front and rear portions of the support beams 16, as shown in FIG.

A plate-shaped rail 20 with a smaller width is laid on the groove 19, and rollers 21 are arranged on the rail 20 at a predetermined pitch in the length direction, and flanges are provided at both ends of the roller 210. 21 a, 21 a are formed and engaged with the side surface of the rail 20, and the side surface (axial direction) of the roller 21 is formed.
At the same time, the shaft 21B of the roller 21 is supported by beam retainers 22 at both ends to regulate the pitch between the rollers 21.

A beam 23 is mounted longitudinally on a roller 21 disposed on the support beam 16, and the beam 23 is a hollow box-like body containing a cooling medium 24 inside, similar to the beam 16. A rail member 25 having a width between the flanges 21 a of the roller 21 is attached below the roller 23 .

The receiver is provided with an appropriate interval in the length direction of the beam 23 so that it is approximately C.
A mold reinforcing member 26... is provided, and this reinforcing member 26.
...The outer periphery of the beam 23 between the beams 23 is filled with a heat insulating material 27, and this receiver serves as a heat insulator for the heat transmitted to the beam 23 from the support fitting 30 of the refractory 29 that constitutes the pedestal 28 provided on the beam 23. This prevents loss, reduces the temperature difference between the upper and lower parts of the metal fitting 30, and prevents cracking due to thermal stress.

A pedestal 28 consisting of a refractory 29 and a box-shaped support fitting 30 with an opening at the top is fixed on the beam 23, and a pedestal 28 is fixed on the beam 23. Scars) 30a, 30a are provided to support both sides of the heat insulating material 2T.

The rollers 21 to pedestals 28 described above are provided for each support beam, and therefore the pedestals 28 for conveying the material have two systems 28A and 28A.
, 28B... In the illustrated example, as shown in FIG. 3, since the pedestal 28 is long, the refractory and supporting metal fittings are made into a block shape of a predetermined length, which are connected back and forth, and the pedestal 28 as a whole is provided.
8.

The forward and backward conveyor 31 is formed by the above, and this conveyor 31 is provided with two systems 31A, 31B, . . . .

5 The front and rear of the pedestal 2B that constitutes the forward and backward conveyor are connected to chains 32 and 33, and in the illustrated example, brackets 23a are attached to the front and rear of the beam 230, and the chains 32 and 33 are connected to these.
The chino 32 includes a roller 32a, a link 32b, and a refractory material 32cO, and the other 33 is constructed in the same manner.

The two parallel conveyors 31a and 31B are driven by a drive system as shown in FIG.

Cheno 32A before and after each conveyor 31A, 31B.

32B, 33A, and 33B are sprockets 34A.

534B, 35A, and 35B, and the sprockets 34A and 34B in the same direction are connected to the shaft 36A, which is arranged in parallel.
36B connects the motor 38 via clutches 37A and 37B.
．． Output sprocket 39. Tension guide sprocket 40.40 and left and right sprockets 41A, 41
The sprockets 41A and 41B are driven in the same direction by a chino 42.

The other chinos 33A and 33B also have sprockets 35A and 3.
The system from 5B to motor 38' is constructed in the same way.

i Regarding the movement of the conveyors 31A and 31B, it is assumed that, for example, one motor 38 is driven in the direction of arrow A, and the other motor 38' is driven in the opposite direction, in the direction of arrow A.

In the illustrated state, clutch 37B is connected and clutch 37A is connected.
are separated.

Also, clutch 37A' is connected and clutch 37B' is disengaged.

Therefore, the power of the motor 38 is transmitted to the conveyor 31B via the clutch 37B, sprocket 34B, and chain 32B, and the conveyor 31B is transferred to the conveyor 31B on the support beam 16B.
2, it is moved forward in the convex direction within the range of stroke 1, and since the clutch 37B' is disengaged, the power of the motor 38' is not transmitted to the system of the chino 33B.

The power of the motor 38' is transmitted to the conveyor 31A via the clutch 37A', the sprocket 35A, and the chain 33A, and the conveyor 31A is moved backward on the support beam 16A in the two directions indicated by the arrows within the range of stroke 1, and the system of the chain 32A is Since the clutch 37A is disengaged, the power of the motor 38 is not transmitted.

The forward and backward strokers of the conveyors 31A and 31B are detected by limit switches, etc., and the clutch 37
Alternately connect and disconnect the systems of motor 38.38'
The power is transmitted alternately to drive the two conveyors in opposite directions.

When the direction of the arrow is set as the conveying direction, one conveyor 31
B is rising on trolley 8B, or is at its rising limit,
The other conveyor 31A is being lowered by the cart 8A, and the system of both conveyors 31A and 31B alternately moves up and down within a height h.

Next, to systematically explain the loading, heating, and unloading of materials, in FIG.
Upon opening, the tray is passed onto the conveyor 31 via the guide roller 7, and conveyed by the conveyor 31 inside the furnace chamber S in the direction of the arrow H.

As described above, the conveyor 31 alternately moves up and down for each system 31A and 31B, and at the upper limit, the carry-in roller 5. The conveyor 31A is at the same level as the horizontal surface of the guide roller 7, and the material is fed by the system of the conveyor 31A at the upper limit of this level, and
The 1B system is lowered and the conveyor is retracted in the opposite direction to prepare for the next feed of material.

At the forward limit of the system of one conveyor 31A, the other conveyor 3
1B rises, and at the position where the height levels are the same, the driving of conveyors 31A and 31B is reversed.

The conveyor 31A descends and passes the material to the ascending conveyor 31B, and the material is sent by the conveyor 31B.

Ru.

In this way, the workpiece W is conveyed by vertical movement of the conveyors 31A and 31B and by switching between forward and reverse driving directions.

At this time, the support beams 16 of the conveyors 31A and 31B only move up and down, and do not move back and forth like a walking beam.

The conveyors 31A, 31B move forward when receiving and supporting the material, and repeat the above process to convey the material to the conveyor 31A, 31B.
31B conveys the material.

During this conveyance process, the material is heated, and during this heating, the conveyor support surface of the material, that is, the lower surface supported by the conveyor, is efficiently heated as the conveyor is replaced.

At the end of the conveyors 31A, 31B, the material is transferred to the guide roller 7, the door 3 is opened, the material is carried out to the carry-out roller 6, and the material is conveyed to the next process.

Although the illustrated embodiments have been described in detail above, the drive systems for the conveyors 31A and 31B are not limited to the illustrated examples and can be selected as appropriate, and the configuration of the conveyor 31 can also be set as appropriate.

As is clear from the above (according to the present invention, compared to a heat treatment furnace equipped with a conventional conveying means using rollers, there is no roller, therefore, the roller, the bearing for the roller, the support means for absorbing the expansion of the roller, and the accompanying seal) It is possible to obtain a heat treatment i-processing furnace that does not require a large number of holes in the furnace side wall, simplifies the transportation means as much as possible, simplifies the furnace structure, and is extremely superior in terms of furnace construction and maintenance. can.

In addition, unlike conventional walking beam type heat treatment furnaces, the beam does not move back and forth, and the opening area of the hearth is as small as possible because only the beam moves up and down. A heat treatment furnace with as little wall heat loss as possible, high thermal efficiency, and effective use of thermal energy can be obtained.

Furthermore, according to the present invention, a good product can be obtained without scratches during conveyance, such as with a roller-type conveyance means, and with no scratches during transfer, such as on the material receivers inside and outside the furnace, such as with a walking beam type conveyance means. The transfer speed can be freely adjusted and set by moving forward and backward with a rotational motion, and the transfer speed of the material processing line and the transfer speed inside the furnace can be matched, which is difficult with a walking beam heat treatment furnace. This enables high-speed unloading and quenching of materials, which contributes to improving the performance of heat treatment furnaces.

In addition, the conveyor line on the loading and unloading side and the receiving side of the material are taken up by the forward movement of the conveyor, and the receiving side is used to transfer the material, so this can be done rationally and smoothly, and the drive system as in the example is adopted. Because of this, the conveyor system can be easily synchronized by the rotational movement of the same drive source, and has various other features, making it highly practical.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a side sectional view of the furnace, FIG. 2 is an enlarged sectional view taken along line 2-2 in FIG. 4 is a sectional view taken along line 4-4 in FIG. 3, and FIG. 5 is a perspective view showing an example of a conveyor drive system. In the drawing, 1 is a furnace, 16 is a support beam, 31 is a conveyor,
32 to 41 are drive systems.

Claims (1)

[Claims] 1. Equipped with at least two systems of support beams that move up and down, a conveyor that moves back and forth in the length direction on the support beam, and a drive system that moves the conveyor back and forth alternately in forward and reverse directions within a constant stroke, A walking conveyor type heat treatment furnace characterized in that the material is conveyed while being passed between two conveyors that move the material up and down.