JP2649130B2 - Vacuum drying equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum drying apparatus used for washing a machined metal part (hereinafter referred to as "work") and then drying the work.

[0002]

2. Description of the Related Art Conventionally, as an apparatus for drying a work after washing with water, an air blow apparatus, a hot air heating apparatus, or the like is generally used. Etc., and were collectively stored in a container and dried.

[0003] A vacuum drying apparatus for drying in a vacuum atmosphere is conventionally known. Since this vacuum drying apparatus does not conduct heat in a vacuum, radiation by far-infrared rays or the like is usually adopted as a heat supply method.

[0004]

However, when a large number of works are collectively housed in a basket or the like and dried by air blow or hot air heating as described above, the works must be sufficiently stirred in the basket or the like. Therefore, the outer work can be dried, but the overlapping inner work cannot be dried because air or hot air does not reach.

[0005] The conventional vacuum drying apparatus has the advantage that the evaporation of water is promoted and drying can be performed at a low temperature in a short time. However, when this vacuum drying apparatus is used for drying a workpiece,
Metals have poor heat absorption to radiation as a heat supply method, and aluminum-based materials have very poor thermal efficiency. Therefore, there is a problem that practicality is poor when the object to be dried is a workpiece. .

That is, in order to transfer heat to a work without radiation and without using other medium such as gas,
Contact heat transfer, which transfers heat directly to the workpiece, is the most effective and reliable. When the object of the contact heat transfer is a large number of works, it is important that the heating element can evenly contact each work and any part of each work.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is capable of drying a large number of works at a time and drying the works in a vacuum atmosphere having high drying efficiency. It is an object to provide a drying device.

[0008]

In order to solve the above-mentioned problems, a vacuum drying apparatus according to the present invention has a cylindrical shape in which a work input port is provided at one end in a longitudinal direction and a work outlet is provided at the other end. A stirring drum having a rotary drum that is hermetically closed in a closed state of an opening / closing lid provided at the work input port and the work outlet, and a spiral part of which is cut off on the inner peripheral surface of the rotary drum. The rotating drum is rotatably supported on a shaft fixed to the center of both ends in the longitudinal direction by a supporting means fixed to a frame, and one of the shafts is formed in a hollow body, and Connected to an external vacuum pump that depressurizes the inside of the rotary drum through a hollow body,
A heater is attached to the outer peripheral surface of the rotary drum, and means for heating a workpiece moving inside by heat radiation from the inner peripheral surface of the rotary drum is provided. Means for rotating the rotating drum,
The opening / closing lid is provided with means for performing opening / closing operations by operating a fitting clutch as required.

[0009]

The vacuum drying apparatus according to the present invention is for drying a large number of works at once. When using the vacuum drying apparatus, firstly, the works after washing are drained, and then the large number of works are rotated from the work input port. Put it in the drum. After the loading, the opening / closing lid is closed, and the rotating drum is hermetically sealed in a state where the work is stored. Next, the rotating drum rotates, and at the same time, the inside of the rotating drum is depressurized by the vacuum pump, and the peripheral wall of the rotating drum is heated by the heater.

In the rotating drum, as the rotating drum rotates, the work is repeatedly lifted and dropped along the inner peripheral surface of the rotating drum by the spiral agitating feed plate, and each work is moved from the heater. Is received by the contact heat transfer from the peripheral wall of the rotating drum, and is uniformly heated.

Further, since the pressure in the rotary drum is reduced,
The evaporation of moisture is promoted, and the work can be dried at a low temperature in a short time. The latent heat taken from the work by the evaporation of water is always supplied by contact with the peripheral wall of the rotating drum.

The work dried in the rotary drum as described above is sent to the work outlet by the stirring feed plate,
The work is taken out by opening the opening / closing lid of the work outlet.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a partially cutaway side view showing a vacuum drying apparatus according to an embodiment, in which 1 is a rotating drum.

The rotating drum 1 is formed of a metal oblong cylinder having both ends closed, and is attached to the frame 2 with shafts 11 and 12 protruding from both ends. in this case,
One of the shafts 11 is formed as a hollow shaft communicating with the inside of the rotary drum 1, and a rotary joint 13 is attached to the tip of the hollow shaft. The rotary joint 13 is connected to a vacuum pump via a vacuum valve or a vacuum break valve (not shown). 3 is connected. The rotary drum 1 is driven to rotate by a forward / reverse rotation motor (forward / reverse rotation mechanism) 4, and the rotation force is transmitted by a chain 41.

At one end of the rotary drum 1, there is provided a work input port 5 which is opened by cutting out a part of the peripheral wall, and at the other end of the rotary drum 1, the work input port 5 is provided. A work outlet 6 is provided at an opposite position. The work inlet 5 and the work outlet 6 are provided with opening / closing lids 51 and 61 for closing the inside of the rotary drum 1 in a closed state.

Next, FIGS. 2 and 3 (sectional views taken along the line AA in FIG. 2) show the opening / closing structure of the opening / closing lid 51 provided in the work input port 5. FIG.
This will be described below.

The opening / closing lid 51 is formed in an arc-shaped plate along the outer peripheral surface of the rotary drum 1, and both end edges thereof are
Are slidably fitted to the guide frames 52, 52 fixed to the guide frame 52.

On the outer surface of the opening / closing lid 51, a rack tooth 5 extends in the circumferential direction which is the opening / closing direction of the opening / closing lid 51.
The pinion gears 54, 54 meshed with the rack teeth 53, 53 are fixed to the guide frame 5.
It is mounted on a gear shaft 55 extending between the gears 2 and 52.
A cover opening / closing motor 56 is attached to the frame 2 so as to face one end of the gear shaft 55. The lid opening / closing motor 56 is supported by a cylinder 57 so as to be able to advance and retreat in the axial direction of the gear shaft 55. When the rotary drum 1 stops at a predetermined stop position, the lid opening / closing motor 56 moves forward, A fitting clutch 58 transmitting torque from the gear 56 to the gear shaft 55 is provided between the motor shaft 56a and the gear shaft 55 via a flexible joint (not shown).

Therefore, when the rotary drum 1 is at the predetermined stop position, the lid opening / closing motor 56 advances by the cylinder 57 to engage the engagement type clutch 58, and the rotational force is transmitted from the lid opening / closing motor 56 to the gear shaft 55. The pinion gear 5
4 rotates, and the pinion gear 54 moves the rack teeth 53 to open and close the opening / closing lid 51. In this case, the cover opening / closing 51 is opened by the forward rotation of the cover opening / closing motor 56,
The lid opening / closing 51 is closed by the reverse rotation of the lid opening / closing motor 56.

As shown in FIG. 3, a hard rubber 59 is attached to the inner surface of the opening / closing lid 51 at a position surrounding the work input port 5 in a closed state.
Functions as a hermetic seal packing when the pressure of the rotary drum 1 is reduced.

Since the opening / closing structure of the opening / closing lid 61 provided at the work outlet 6 is the same as the opening / closing structure of the opening / closing lid 51 of the work input port 5, the description is omitted.

Returning to FIG. 1, a spiral stirring feed plate 7 is provided on the inner peripheral surface of the rotary drum 1 so as to project therefrom. The stirring feed plate 7 is for moving the work accommodated in the rotary drum 1 while stirring by rotating the rotary drum 1, and is provided continuously from the work input port 5 to the work outlet 6. ing.

In the present invention, since the forward / reverse rotation motor 4 is used as the drive motor for the rotary drum 1, if the rotary drum 1 is rotated forward and backward in the drying process of the work, the work moves forward and backward alternately. The drum is repeatedly lifted and dropped along the inner peripheral surface of the rotating drum 1. Therefore, sufficient processing is possible even with a compact rotating drum. In addition, in the take-out step after drying, the work can be moved to the work take-out port 6 only by rotating the rotary drum 1 forward.

A heater 8 serving as a heating source is mounted on the outer peripheral surface of the rotary drum 1 at a position avoiding the opening / closing lids 51 and 61, and the outer periphery of the heater 8 is covered with a heat insulating material 81. The power supply to the heater 8 is performed via a slip ring.

The rotary drum 1 has a stop position where the work inlet 5 is opened upward and the work outlet 6 is opened downward, and the work is opposed to the work inlet 5 at the stop position. A supply hopper 91 is provided, and a work receiving container 92 faces the work outlet 6.
Is provided. Although not shown, a sensor for detecting the presence of the work is provided on the work outlet 6 side.

Next, the operation of the embodiment will be described. When using the vacuum drying apparatus of this embodiment, first, the work after water washing is drained, and then stored in the work supply hopper 91. Next, the work is accommodated in the rotating drum 1. In this case, at a predetermined stop position of the rotating drum 1,
The work input port 5 is opened by opening the opening / closing lid 51,
A fixed amount of work is supplied from the work supply hopper 91.
After the work is supplied, the opening / closing lid 51 is closed to seal the inside of the rotating drum 1.

Next, the rotating drum 1 is rotated, and at the same time, the inside of the rotating drum 1 is depressurized by the vacuum pump 3 and the peripheral wall of the rotating drum 1 is heated by the heater 8.

Due to the rotation of the rotary drum, the work moves in the rotary drum 1 by repeatedly moving up and down along the inner peripheral surface of the rotary drum 1 by the spiral stirring feed plate 7. At this time, if you rotate the rotating drum forward and backward,
Processing can be performed for a long time. Therefore,
The contact state of the work with the inner peripheral surface of the rotating drum 1 constantly changes, and each work receives heat from the heater 8 from the peripheral wall of the rotating drum 1 by contact heat transfer, and is uniformly heated.

Further, since the inside of the rotary drum 1 is depressurized by the vacuum pump 3, the evaporation of water is promoted, and the work can be dried at a low temperature in a short time. The latent heat taken from the work by the evaporation of water is always supplied by contact with the peripheral wall of the rotating drum 1.

The work dried in the rotary drum 1 as described above is sent to the work take-out port 6 by the stirring feed plate 7. Then, the rotation of the rotary drum 1 is stopped by the detection of the sensor, the vacuum valve in the pipeline is closed, and the vacuum breaking valve is opened. Thereafter, the work is taken out of the rotary drum 1 into the work receiving container 92 by opening the opening / closing lid 61 of the work take-out opening 6. Thereafter, the drying operation is repeated with one cycle from the input of the work to the removal of the work as one cycle.

Although the embodiment of the present invention has been described with reference to the drawings, the specific configuration is not limited to this embodiment.

[0032]

As described above, in the vacuum drying apparatus according to the present invention, the heater is attached to the outer peripheral surface of the rotary drum, and the heater is directly contacted with the rotary drum and the spiral stirring feed plate directly heated by the heater. Heating action, and
Due to the stirring action of the spiral stirring feed plate, and furthermore, the effect of promoting the evaporation of water in a vacuum atmosphere has the effect that the drying treatment can be performed uniformly and efficiently.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing a vacuum drying apparatus according to an embodiment.

FIG. 2 is a side view showing an opening / closing structure of an opening / closing lid provided at a work input port in the vacuum drying device.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary drum 2 Frame 3 Vacuum pump 4 Forward / reverse rotation motor (forward / reverse rotation mechanism) 5 Work inlet 51 Open / close lid 6 Work outlet 61 Open / close lid 7 Stirring feed plate 8 Heater 81 Insulation material 58 Fitting clutch

Claims (1)

(57) [Claims] 1. A cylindrical shape having a work inlet at one end in a longitudinal direction and a work outlet at the other end, and a closed state of an opening / closing lid provided at the work inlet and the work outlet. A rotating and rotating drum is provided, and a stirring and feeding plate having a spiral shape and a center portion thereof is cut off and protruded from an inner circumferential surface of the rotating drum, and the rotating drum is fixed to centers of both end surfaces in a longitudinal direction. The shaft is rotatably supported by a support means fixed to the frame, and one of the shafts is formed in a hollow body and connected to an external vacuum pump for reducing the pressure inside the rotary drum through the hollow body, A heater is attached to an outer peripheral surface of the rotary drum, and a means for heating a workpiece moving inside by heat radiation from an inner peripheral surface of the rotary drum is provided. ,
A vacuum drying apparatus comprising: means for rotating a rotary drum; and means for opening and closing the opening / closing lid by operating a fitting clutch as required.