JPH0346530B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conveying device for a cooling chamber in a vacuum furnace, an atmosphere furnace, a heating furnace, etc., which is installed in the cooling chamber of the vacuum furnace to convey a workpiece. be.

A conventional transfer device installed in a cooling chamber of a vacuum furnace has a configuration as shown in FIG. 1, for example.

In FIG. 1, a is a cooling chamber, and b is the cooling chamber a.
Two rails are arranged in parallel inside, c is a fork that runs along the rail b, and d is a fork that runs along the rail b.
Two front wheels are provided for guiding and supporting the rail, e are the same two rear wheels, and f is the rail b.
By raising and lowering the front end of the fork c
g is a workpiece such as a steel part, and h is a heating chamber. That is, the fork c travels along the rail b, and the workpiece g is transported to the heating chamber h.
The fork C has two wheels d installed at the front and two wheels d installed at the rear at a relatively large horizontal distance i to prevent it from falling due to the load of the workpiece g. It is supported by two wheels e. Therefore, since the large horizontal distance i is required, the cooling chamber a requires a large amount of wasted space j.

That is, in the conventional device, since the above-mentioned wasted space j is required, the cooling chamber a inevitably becomes longer in that direction, and the fork of the external charging device also needs to be longer by that length. In addition, the internal volume of the cooling chamber a increases by its length, resulting in an increase in the amount of vacuum pumping and refilling gas, the size of the attached vacuum pump, and the installation area of the furnace. There were flaws.

The present invention changes the mechanism for holding the load applied to the fork in the furnace from the conventional horizontal system to a vertical system. In other words, the fork overturning moment (the vertical force of the wheel b), but by replacing this overturning moment with a horizontal thrust and making it substantially receive it on a vertical surface, a cooling chamber in a vacuum furnace can overcome the above-mentioned drawbacks of the conventional device. The purpose of this invention is to provide a conveyance device for the following.

For this reason, the configuration of the conveying device for the cooling chamber in the vacuum furnace of the present invention includes a traveling platform that travels inside the cooling chamber of the vacuum furnace, a fork provided on the traveling platform and on which the workpiece is placed, and a load of the fork. A traveling platform feeding device that has a traveling platform support part that prevents the traveling platform from overturning and causes the traveling platform to travel, and a fork lifting device that raises and lowers the fork, and
The vehicle is characterized in that the traveling platform support portion is provided at an upper portion and a lower portion substantially within a plane that passes through the traveling platform and intersects with the running direction of the traveling platform.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 4.

In FIG. 2, 1 is a vacuum furnace, which has a heating chamber 2 and a cooling chamber 3 inside. Reference numeral 4 denotes rails, which are fixedly attached near the inner bottom of the cooling chamber 3 and are laid horizontally. Reference numeral 5 denotes feed screws, which are rotatably supported by bearings 6, and two of them having the same diameter and the same pitch are provided horizontally at the top and bottom. Reference numeral 7 denotes a trolley-type traveling platform, which has wheels 8 that roll on rails 4, and has female-threaded receiving screws 9 that are screwed into each feed screw 5. 10
1 is a fork (not shown) on which a workpiece is placed, and is attached to an elevating cart 11, which is slidably fitted into a vertical groove provided in the traveling platform 7. 12 is a lifting device which will be described later, and 13 is a rotating shaft.

The forward movement (movement toward the heating chamber 2) and the backward movement (movement away from the heating chamber 2) of the carriage 7 are performed by forward and reverse rotation of the feed screw 5. As mentioned above, four feed screws 5 are provided, and the male threads are cut under the same conditions, and as shown in FIG. 3, one endless chain 1 provided outside the cooling chamber
4, the four feed screws 5 rotate exactly the same, and the carriage 7 is moved in parallel while maintaining the same attitude. That is, as shown in FIG. 3, a sprocket 15 is attached to each feed screw 5, a sprocket 17 is attached to the drive motor 16, and the chain 14 is connected to each sprocket 15 and 17. has been done.

As shown in an enlarged view in FIG. 4, the elevating device 12 consists of an elevating lever mechanism, that is,
The rotating lever 1 is locked to the rotating shaft 13 with a key at the top.
8, a horizontal lever 20 having a rolling wheel 19 rolling on the running base 7 and pivotally attached to the lever 18 with a pin;
A support lever 21 is pivotally connected to the lever 20 by the axis of a wheel 19, a support lever 23 is pivotally connected to the lever 21 in an X shape and has a wheel 22 that rolls on the lower surface of the lifting cart 11, etc. As shown in FIG. 3, the drive mechanism for the rotating shaft 13 includes a drive motor 24 provided outside the cooling chamber, a sprocket 25 attached to the motor 24, and a rotating shaft 1.
It consists of a sprocket 26 attached to sprocket 3, and an endless chain 27 spanning between sprockets 25 and 26. That is, by rotating the drive motor 24 shown in FIG. 3 in the normal or reverse direction, the rotating shaft 13 is rotated in the normal or reverse direction via the chain 27, thereby causing the rotating lever 18 shown in FIG. rotates forward or reverse,
The support lever 21 cooperates with the support lever 23 by moving the horizontal lever 20 to the left or right to move the lifting carriage 11.
2, the fork 10 (see FIG. 2) attached to the lifting cart 11 moves up and down. It should be noted that the rotating lever 18 is adapted to slide with respect to the rotating shaft 13 when the traveling platform 7 is traveling.

In addition, the carriage feeding device includes the feed screw 5 shown in Figs. 2 and 3, the endless chain 14 shown in Fig. 3, and the sprockets 15 and 1.
7. The receiving screws 9, which are composed of a drive motor 16 and the like, and which are screwed together with the four feed screws 5 of the traveling base 7 and are located at two locations each at the upper and lower parts, are perpendicular to the running direction of the traveling base 7. in the plane, and therefore
The threaded portion of each feed screw 5 constitutes a carriage support portion that prevents the carriage 7 from falling due to the load of the fork 10. That is, the overturning moment for supporting the load on the fork 10 is received by the axial normal force of the upper and lower feed screws 5. In other words, the mechanism for holding the load applied to the fork 10 in the furnace is of a vertical type. For this reason, the length w of the traveling base 7 in the traveling direction (see FIG. 2) may be shortened, so it is minimized. Furthermore, since it is not necessary to provide the wheels 8 at the front and rear portions, they are provided only at the center.

In the vacuum furnace cooling chamber conveying device configured as shown in FIGS. 2 to 4, as described above, the traveling platform 7 is moved forward and backward by the rotation of the feed screw 5, and the forks 10 are raised and lowered. is performed by rotating the rotating shaft 13. Therefore, the movement of the fork 10 is as follows when carrying the workpiece into the heating chamber 2:
The object to be processed is placed in the cooling chamber 3 in an elevated state and advanced to the inside of the heating chamber 2, then lowered to place the object to be processed in the heating chamber 2, and in this lowered state is retreated to the cooling chamber 3. Next, when carrying out the workpiece from the heating chamber 2, it is advanced to the inside of the heating chamber 2 in a lowered state in the cooling chamber 3, and then raised to the inside of the heating chamber 2.
The object to be processed inside is placed thereon, and in this raised state, it is retreated to the cooling chamber 3.

In the above embodiment, two feed screws 5 are provided in the upper and lower portions of the carriage feeding device, but one feed screw 5 may be provided in the lower portion. Further, the design of the lifting lever system of the lifting device 12 may be changed to a screw type. Furthermore, the design of the feed screw system which also serves to prevent the carriage from falling in the above embodiment may be changed to a rack and pinion system. That is, a rack is fixed to the furnace side instead of the feed screw 5, a pinion is attached to the running table side instead of the receiving screw 9, and the traveling table 7 is moved by reciprocating the piston rod extending from outside the furnace into the furnace. You may run it. Similarly, the design of the feed screw system may be changed to a chain sprocket system.

As described above, the present invention has a traveling platform support part as a part of the traveling platform feeding device to also serve to prevent the traveling platform from overturning due to the load of the fork, and the traveling platform support part has the following functions: Since it is a so-called vertical support system in which the upper and lower parts are provided substantially in a plane that passes through the carriage and intersects with the running direction of the carriage, compared to the conventional horizontal support system, The depth of the running platform, that is, the length of the running platform in the running direction, can be minimized, which eliminates the wasted space inside the furnace and makes the furnace that much shorter. Therefore, it has the effect of completely eliminating the drawbacks of the conventional horizontal support system.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional side view showing an example of a conventional in-furnace conveyance device, Fig. 2 is a partially cutaway perspective view showing an embodiment of the present invention, and Fig. 3 is a drive of the feed screw shown in Fig. 2. FIG. 4 is an elevational view showing details of the lifting device of FIG. 2. 1...Vacuum furnace, 2...Heating chamber, 3...Cooling chamber,
4...Rail, 5...Feed screw, 6...Bearing, 7
...Dolly-type traveling platform, 8...Wheels, 9...Receptacle screws, 10...Fork, 11...Elevating cart, 12
... Lifting device, 13... Rotation axis, w... Depth dimension of traveling platform.

Claims (1)

[Claims] 1. The above-mentioned vacuum furnace has a traveling platform that travels inside the cooling chamber of the vacuum furnace, a fork provided on the traveling platform and on which a workpiece is placed, and a traveling platform support part that prevents the traveling platform from falling due to the load of the fork. a traveling platform feeding device for traveling a traveling platform; and a fork elevating device for raising and lowering the fork; characterized by being provided in the upper and lower parts in intersecting planes,
Transfer device for the cooling chamber inside the vacuum furnace.