JP2917640B2 - Automatic heat treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic heat treatment apparatus.

[0002]

2. Description of the Related Art A typical example of an automatic heat treatment apparatus for removing a heat-treated object after a predetermined time has elapsed is a tunnel-type furnace. This is a heat treatment apparatus having a tunnel-like structure extending in the longitudinal direction. In many cases, various conveyors are built-in for carrying the object in the furnace, and the speed of the various conveyors is adjusted so that the objects can stay in the furnace for a predetermined heat treatment time.

[0003]

Problems to be solved by the tunnel type automatic heat treatment apparatus are as follows.

(1) Due to the structure extending in the longitudinal direction,
Large floor space is required.

(2) A complicated drive system such as various conveyors, rollers, chains, sprockets, etc. is required for transporting the object in the furnace.

(3) Since the temperature distribution tends to be non-uniform due to the structural length, a large heater capacity is required.
Poor thermal efficiency.

(4) When a belt conveyor or a net conveyor is used for transporting an object in a furnace, there is a case where a part which is turned back and turned over must be passed outside the furnace. In that case, since the heated conveyor is cooled, the heat efficiency is deteriorated, the temperature distribution is adversely affected, and the room temperature (workplace) is raised to deteriorate the work environment.

(5) In the case of the tunnel type, a multi-stage type is structurally and economically difficult, and there is often one exit. Therefore, the processing capacity is small for large facilities.

The present invention has been made in view of the above points, and has as its object to provide an automatic heat treatment apparatus that is space-saving, has good thermal efficiency, has a stable temperature distribution, and is capable of improving efficiency in a multistage manner. It is.

[0010]

SUMMARY OF THE INVENTION The object of the present invention is to provide an automatic heat treatment apparatus comprising: a vertically long cylindrical heat treatment tank having a heater disposed therein; It has a motor provided via a speed reducer at the shaft end protruding outside from the heat treatment tank of this shaft, and a striker fixed to the lower part of the shaft speed reducer and arranged at equal intervals in the circumferential direction. A disc, a rotation-stop limit switch and a shutter-open limit switch disposed at an upper portion of the heat treatment tank at a predetermined interval so as to operate by being hit by a striker at a lower portion of the disc; A hanger having hooks connected at equal intervals in the axial direction of a portion in the heat treatment tank and arranged at predetermined intervals in the circumferential direction, and a charging door and a shutter opening provided on an outer wall of the heat treatment tank; For limit switch A discharge shutter that operates in conjunction with the operation of the switch, and an external inclined conveyor that is provided inside and outside of the discharge shutter unit and carries out the object dropped from the hook to the upper part, and has a hanger This is achieved by rotating the object by a certain angle every certain time and discharging the object from a discharge shutter linked to the rotation.

[0011]

Since the above means is provided, it does not require a large floor space, various conveyors for conveying in the furnace, and a large heater capacity for making the temperature distribution uniform as in the conventional case. Distribution and thermal efficiency are improved.

[0012]

Next, the present invention will be described in detail with reference to examples.

FIG. 1 shows an embodiment of the present invention. In the present embodiment, an automatic heat treatment apparatus is provided with a vertically long cylindrical heat treatment tank 2 having a sheathed heater 1 disposed therein.
And a shaft 3 extending vertically in substantially the center of the heat treatment tank 2.
A motor 5 provided at a shaft end of the shaft 3 protruding outside from the heat treatment tank 2 via a speed reducer 4;
A disk 7 having a striker 6 fixed to a lower portion and arranged at equal intervals in a circumferential direction, and a predetermined interval so as to be operated by being hit by the striker 6 below the disk 7. The rotation stop limit switch 8 and the shutter opening limit switch 9 disposed on the upper part of the heat treatment tank 2 are connected at equal intervals in the axial direction of a portion of the shaft 3 in the heat treatment tank 2 via the same. A hanger 11 having hooks 10 arranged at predetermined intervals in a circumferential direction;
A discharge shutter 13 which operates in conjunction with the operation of the input door 12 and the shutter opening limit switch 9 provided on the outer wall of the vehicle, and an object which is provided inside and outside the discharge shutter 13 and which is dropped from the hook 10 to an upper portion thereof. The object 14 is carried out, and is configured to have external inclined conveyors 15 and 16, and the hanger 11 is rotated by a certain angle at regular time intervals, and the object 14 is rotated from the discharge shutter 13 linked with the rotation.
Was discharged. By doing this,
Unlike the conventional, large floor space, various conveyors for transfer in the furnace, large heater capacity to make the temperature distribution uniform, etc. are not required, the temperature distribution and thermal efficiency are improved with a small capacity heater, It is possible to obtain an automatic heat treatment apparatus that is space-saving, has good thermal efficiency, has a stable temperature distribution, and is capable of improving efficiency in a multistage manner.

That is, a multi-stage (four-stage in FIG. 1) rotatable hanger 1 is provided inside a cylindrical heat treatment tank 2 having a sheath heater 1 attached to the inside and a heat insulating material 17 applied to the outside.
1 is mounted via a bearing 18. Hanger 1
One end of one shaft 3 is connected to a motor 5 via a speed reducer 4 such as a worm gear. Further, a disk 7 on which strikers 6 corresponding to the number of pitches are mounted at an equal pitch is fixed to the shaft 3, and a rotation stop limit switch 8 and a shutter open limit switch 9 are hit. Hooks 1 at equal pitch (equal angle) on loop hanger 11
0 is attached. The heat treatment tank 2 is provided with a charging door 12 for charging the object 14 and a discharge shutter 13 for discharging the object 14. The input door 12 is manually opened and closed, but the discharge shutter 13 is provided with an air cylinder 19 that is linked to the rotation of the hanger 11 so that it can be automatically opened and closed. Inside the discharge shutter 13, there is provided a short internal inclined conveyor 15 and a discharge striker 20 which strikes the object 14 and removes it from the hook 10. Outside the discharge shutter 13, an external inclined conveyor 16 for transferring and transporting the object 14 is provided. The top plate of the heat treatment tank 2 is provided with a stirring fan 21 for making the temperature distribution uniform.

The operation of the thus configured automatic heat treatment apparatus will be described below.

In the heat treatment tank 2 maintained at a predetermined temperature
Is the time T set in advance by the timer ₁Hanger 1 for each
1 is 1 pitch (for example, 30 if it is 12 equally divided)⁰Only)
It rotates continuously. Also, if you rotate one pitch at a time
In conjunction with this, the discharge shutter 13 opens and closes one by one. That
Mechanism is set time T₁Is elapsed, the motor 5 is driven, and
In the example of the figure, the hanger 11 rotates counterclockwise (right side).
You. On the way, the striker 6 of the disk 7 is the shutter opening limit.
Tap switch 9. At the same time, the discharge shutter 13
Opens and the set time T_TwoClose after elapse (T_TwoIs a few seconds). Han
The gar 11 has a striker 6 next to the disk 7 and a limiter for stopping rotation.
Switch 8 is actuated, ie, for one pitch
(30 in this case⁰) Spin and stop. And again
The timing of the imamer begins, T₁When the time has elapsed, the motor 5
Is driven, and the hanger 11 rotates. Hereafter, when
Repeat until

The worker opens the input door 12, suspends the object 14 on the hook 10 stopped at that position, and closes the input door 12. The object 14 rotates intermittently in the heat treatment tank 2 and is dispensed by itself after approximately (pitch number−1) × T ₁ hour has elapsed. When the hanger 11 rotates, the discharge shutter 13 opens in conjunction with the rotation of the hanger 11, while the discharge striker 20 protruding from the inner wall of the heat treatment tank 2 removes the object 14 from the hook 10 and falls onto the internal inclined conveyor 15. Let it. Discharge shutter 13
Since the is still open, the object 14 is transferred to the external inclined conveyor 16 as it is. Then (by T ₂ elapsed)
The discharge shutter 13 closes.

As described above, according to this embodiment, the following effects can be obtained.

(1) Space saving: It is a three-dimensional multi-stage type device, and a rotary type can save space.

(2) Simple structure: No complicated drive system or structure such as a conveyor or roller is required, and the structure is simple because of direct drive.

(3) Economical efficiency: It is small and simple because of the reasons (1) and (2), and the production cost is low.

(4) Good temperature distribution: There is no hopper or shielding plate inside, and it is mainly composed of only the object and the hanger. Moreover, since the airtightness is good, the stirring efficiency is good and the temperature distribution is uniform even with a small capacity heater. It is. (Low running cost).

(5) High efficiency ... Multi-stage type is easy, so it has a high capacity for the equipment cost and size.

(6) Easy setting of processing time: The heat treatment time can be easily changed by changing the time setting between pitch feeds.

The present invention requires a certain period of time for purposes other than heat treatment, and can be applied as a facility for automatically dispensing.

The range of the heat treatment time is limited.

That is, the loop-shaped hanger does not always rotate, but has a mechanism that rotates by a certain angle every certain time. Therefore, when the object is hung on the hook of the hanger immediately before the rotation, and when the object is hung on the hook of the hanger immediately after the rotation, the heat treatment time, that is, the object is discharged from the discharge shutter after one rotation after being hung. There is a difference in the time until the emergence.

[0028] For example, the angle 30 ⁰ in a loop of the hanger
It is assumed that 12 hooks are attached every other time, and that it rotates 30 ⁰ (that is, one pitch) once every two hours. If the timing at which the object is hung on the hook at the position of the slot is just before the rotation, the rotation starts immediately after the hanging, and the time remaining at the position of the slot is zero. If the suspension timing is immediately after the rotation, it means that the user stays at the position of the input port for 2 hours. That is, there is a difference of two hours between them. In the former case, the heat treatment time is 22
Time, 20 hours in the latter case. However, it is assumed that the discharge shutter is at the 12th pitch counting from the input port,
It is assumed that the target is immediately discharged when the discharge shutter reaches the position of the discharge shutter (12th pitch). (It does not stay at the 12th pitch).

[0029]

As described above, the present invention provides a vertically long cylindrical heat treatment tank in which a sheathed heater is disposed, an axis extending in a direction substantially perpendicular to the center of the heat treatment tank, and a heat treatment A motor provided via a speed reducer at the shaft end protruding outside from the tank, a disk fixed to the lower portion of the shaft speed reducer, and having a striker arranged at equal intervals in the circumferential direction, A rotation stop limit switch and a shutter opening limit switch disposed at an upper portion of the heat treatment tank with a predetermined interval therebetween so as to operate by being hit by a striker at a lower portion of the disc, and a shaft inside the heat treatment tank. A hanger having hooks connected at equal intervals in the axial direction of the parts and arranged at predetermined intervals in the circumferential direction, and a closing door and a shutter opening limit switch provided on the outer wall of the heat treatment tank. Link with movement It has a discharge shutter that is operated inside and outside, and an external inclined conveyor that is provided inside and outside of this discharge shutter part and carries out the object dropped from the hook to the upper part, and the hanger is set at a fixed angle at regular intervals. The object is ejected from the ejection shutter linked to the rotation, so that the floor space, the various conveyers for conveying in the furnace, the large heater capacity to make the temperature distribution uniform, etc. Temperature distribution and thermal efficiency are improved with a small capacity heater without the need for
It is possible to obtain an automatic heat treatment apparatus that is space-saving, has good thermal efficiency, has a stable temperature distribution, and is capable of improving efficiency in a multistage manner.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of an automatic heat treatment apparatus of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 sheath heater 2 heat treatment tank 3 axis 4 reduction gear 5 motor 6 striker 7 disk 8 rotation stop limit switch 9 shutter open limit switch 10 hook 11 hanger 12 input door 13 discharge shutter 14 object 15 internal inclined conveyor 16 external inclination Conveyor

Claims (1)

(57) [Claims] 1. A vertically long cylindrical heat treatment tank having a heater disposed therein, a shaft extending substantially perpendicular to the center of the heat treatment tank, and a shaft end of the shaft protruding outside from the heat treatment tank. A motor provided via a speed reducer, a disk fixed to a lower portion of the shaft on the shaft and having strikers arranged at equal intervals in the circumferential direction, and a lower portion of the disk A rotation stop limit switch and a shutter opening limit switch disposed at an upper portion of the heat treatment tank at predetermined intervals so as to be operated by being hit by a striker; and a shaft of a portion of the shaft in the heat treatment bath. Hangers having hooks connected at equal intervals in the direction and arranged at predetermined intervals in the circumferential direction thereof, and operation of a closing door and a shutter opening limit switch provided on an outer wall of the heat treatment tank. To A discharge shutter that moves and operates, and an external inclined conveyor that is provided inside and outside the discharge shutter unit and carries out the object dropped from the hook to the upper part thereof, and comprises the hanger for a predetermined time. An automatic heat treatment apparatus characterized in that the object is discharged from a discharge shutter linked with the rotation by rotating the object by a fixed angle every time.