JP2593975Y2 - Turntable device with torque limiter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive system for rotating a turntable of a heat treatment apparatus, and more particularly to a drive system provided with a torque limiter mechanism.

[0002]

2. Description of the Related Art A turntable of a heat treatment apparatus can be rotated by a rotation torque generated by a motor or the like. Rotational torque from the motor is transmitted to the turntable through various drive mechanisms, and these drive mechanisms may be provided with limit mechanisms for protection of the motor and the like. The limit mechanism is used to automatically cut off the transmission of rotational torque when the turntable is overloaded.

[0003]

As a conventional limit mechanism, an overload of a motor is detected by a current value (electric signal) of the turntable motor, and the turntable motor is electrically turned off according to the detection result. There is something.
Such a type that detects a current value is not necessarily suitable for a relatively small turntable motor that rotates a turntable because it is difficult to determine an overload based on the current value. An object of the present invention is to provide a limit mechanism that mechanically releases an overload of a motor without detecting a current value as in the related art, in order to solve such a problem.

[0004]

A turntable with a torque limiter according to the present invention includes a turntable, a drive source for rotating the turntable, a turntable drive system driven by the drive source, and a turntable. A turntable driven system engaged with the table drive system to rotate the turntable;
It is positioned above the table,
When the turntable is overloaded,
Thrust load relief means is provided to release a thrust load applied from the turntable driven system to the turntable drive system to release the engagement between the turntable drive system and the turntable driven system. In one embodiment of the present invention
According to this report, the thrust load relief means is a turntable drive system.
It is provided in.

[0005]

FIG. 1 is a perspective view of a heat treatment apparatus according to an embodiment of the present invention, and FIG.
Sectional views along III-III are shown in FIGS. Although the heat treatment apparatus of the present embodiment is a hot air heating type, the present invention is also suitably used for a microwave heating type or a combination of both. After the air heated by the heater 4 is turned into hot air by the fan 2 rotated by the fan motor 3, the air passes through a spiral chamber 8 provided above and below the heating chamber 1, and is further provided above and below the jet plate 6, 7. The heated object 17 is jetted through the jet port 19. In order to uniformly heat the object 17 to be heated, the turntable 14 is rotated at a predetermined speed on the turntable shaft 15 during the heat treatment. The motor 13 fixed to the gear box 18 by the turntable motor fixing legs 28 generates a rotation torque for rotating the turntable 14. 5 to FIG.
The rotation torque generated by the
Only a transmission mechanism for transmitting the information to the transmission is partially shown. The turntable driving gear 9 meshed with the teeth 16 provided on the outer periphery of the turntable 14 is connected to a connecting shaft A21.
22. Left and right twisted spiral miter gears 12 and 10 are fixed to respective ends of the connection shaft A21 and the connection shaft B22, and these gears are engaged so as to engage with each other in a direction perpendicular to each other.

[0006] The connecting shaft A bearing 27 is the bearing fixture 1
1 and is fixed to the upper part of the heating chamber 1 by the connecting shaft A2.
1 is rotated inside this. The connection shaft B22 is adapted to rotate between two connection shaft B bearings 26 of the gear box 18, and in a normal state, the connection shaft A21 is engaged through the engagement of the left and right twisted spiral miter gears 12 and 10. To rotate. As described above, the gear box 18 is used to support a turntable driving system including the connecting shaft B22 and the right-hand spiral miter gear 10 fixed to the end of the connecting shaft B22. The rotational torque transmitted by the turntable drive system is then transmitted to the turntable 14 through a turntable driven system including a connecting shaft A21 and a left-handed spiral miter gear 12 fixed to the end of the connecting shaft A22. Is transmitted. The connecting pin 24 is inserted into the opposite side of the right-hand spiral miter gear 10 fixed to the end of the connecting shaft B22. The connection pin 24 also serves as a stopper. The connection shaft B22 is a grooved connection shaft joint 2
3 is designed to slide in the horizontal direction,
The opposite side of the connection shaft joint 23 is fixed to a tip of a shaft of the motor 13 by a connection shaft pin 24.

The connecting shaft joint 23 and the motor 13
The compression coil spring 25 is provided in the gap between the two, and the compression coil spring 25 is in the extended state in the normal state, so that the rotational torque from the motor 13 is transmitted well from the connecting shaft B22 to the turntable driven system side . When an overload is applied to the turntable 14 for some reason, a thrust load having a direction as shown in FIG. 8 is generated between the right-hand spiral miter gear 10 and the left-hand spiral miter gear 12. Even when a thrust load occurs, the rotational torque of the motor 13 is normally transmitted to the turntable drive gear 9 as long as the pressing force of the compression coil spring 25 is larger than the magnitude of the thrust load. This state is shown in FIG. When the turntable 14 is overloaded by a predetermined amount or more, or the turntable 14 is locked for some reason and the magnitude of the thrust load is larger than the pressing force of the compression coil spring 25, the compression coil spring 25 moves in the direction of the motor 13. Compressed. This state is shown in FIG. As is apparent from the drawing, in this case, the right-hand spiral miter gear 10 rotates while the left-hand spiral miter gear 12 is removed by the compression coil spring 25 being compressed. As a result, a direct load is prevented from being applied to the turntable motor 13, and the overload removing function, that is, the torque limiter mechanism operates.

[0008] Thus, according to the present invention, when the took more than a predetermined overload on the turntable 14, automatically disengage the torque limiter mechanism from engagement with the turntable driving system and the turntable driven system Is provided.

[0009]

Unlike the method of detecting an overload by detecting an electric signal, the overload is detected and released by using only a mechanical action, so that it is difficult to detect the electric signal. A limit mechanism that can be used in a small heat treatment apparatus using a turntable is provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a heat treatment apparatus according to the present invention.

FIG. 2 is a cross-sectional view taken along the line II of the heat treatment apparatus of FIG.

FIG. 3 is a cross-sectional view taken along line II-II of the heat treatment apparatus of FIG.

FIG. 4 is a cross-sectional view of the heat treatment apparatus of FIG. 1, taken along line III-III.

FIG. 5 shows only the turntable drive system according to the present invention.

FIG. 6 is a diagram showing a normal operation state of the turntable drive system according to the present invention.

FIG. 7 is a diagram showing a normal operation state of the turntable drive system according to the present invention.

FIG. 8 is a diagram showing a state in which the torque limiter function of the turntable drive system according to the present invention is operated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating room 2 Fan 3 Fan motor 4 Heater 5 Fan guide 6 Above jet plate 7 Below jet plate 8 Spiral chamber 9 Turntable drive gear 10 Right spiral spiral miter gear 11 Bearing fixture 12 Left spiral spiral miter gear 13 Turntable motor 14 Turntable 15 Turntable shaft 16 Turntable teeth 17 Heated object 18 Gear box 19 Jet injection port 20 Turntable bearing 21 Connection shaft A 22 Connection shaft B 23 Connection joint 24 Connection pin 25 Compression coil spring 26 Connection shaft B bearing 27 Connection Shaft A bearing 28 Turntable motor fixed shaft

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H24C 15/16 H05B 6/78

Claims (2)

(57) [Scope of request for utility model registration] 1. A turntable, a drive source for rotating the turntable, a turntable drive system driven by the drive source, and engaged by the turntable drive system to rotate the turntable. In a turntable device including a turntable driven system, the driving source is located above the turntable.
Positioned, the turntable device, when overload is applied to the turntable, escape the thrust load applied to the turntable drive system from the turntable driven system, the turntable drive system and the A turntable device provided with a thrust load relief means for releasing engagement with a turntable driven system. 2. The method according to claim 1, wherein said thrust load releasing means is provided in said turn.
The turn according to claim 1, which is provided in a table drive system.
Table equipment.