JPH0579448B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method and apparatus for shrink-fitting a heated rotor to a compressor crankshaft, and is particularly suitable for application to an automated compressor line. and regarding equipment.

[Conventional technology]

For example, as described in JP-A No. 169742/1983, when shrink-fitting the rotor of a completely hermetic compressor in a conventional method and apparatus for shrink-fitting members, the heated rotor is It was shrink-fitted so that it could be lifted from the bottom of the shaft. When this method is incorporated into the automatic assembly process of a hermetic compressor,
When assembling the compressor part with the airtight container, it is easier to assemble it by pointing it downward, so the assembly is completed with the tip of the crankshaft pointing downward. During the next process of shrink-fitting the crankshaft and rotor, if the heated rotor is to be inserted from above, the tip of the crankshaft must be turned over so that it faces upward. To prevent this reversal, the rotor was shrink-fitted from below.

[Problem that the invention seeks to solve]

When the above-mentioned conventional technology is incorporated into the automatic assembly process of a completely hermetic compressor, it has the effect of eliminating the reversing process of the crankshaft side member. Also, it is difficult to measure the gap between the stator inner diameter and rotor outer diameter after the rotor has been shrink-fitted because the crankshaft is positioned below.

Furthermore, since the rotor shrink-fitting mechanism part enters the lower part of the apparatus, there is a problem in that maintenance of the equipment is difficult.

An object of the present invention is to provide a method and apparatus for shrink fitting members suitable for automatic assembly of a hermetic compressor.

[Means for solving problems]

A feature of the present invention is that when one of two members is heated and shrink-fitted, air pressure is applied to the outer periphery of the fitting guide of one of the heating members to be shrink-fitted, and the heating member is moved to the center of the guide. a heating device that heats one of the members to be shrink-fitted by pressing the heating member from above while the member is placed in a shrink-fit position, and a transfer unit that moves the heating member to a predetermined position. a fixing device for fixing and positioning the other shrink-fit fitting member below the heating member transferred to the predetermined position; A shrink fit fitting force applying means grips and guides by vacuum suction and applies a shrink fit fitting force, and after the heating member is guided to a mating position of a mating member by the guide, the hole in the heating member is The heating member is provided with an air supply device for supplying air pressure from the inside of the guide toward the outer periphery to position the heating member at the center of the guide.

[Effect]

When two members are shrunk-fitted, the heating device heats the upper one of the upper and lower members, and the shrink-fit force applying means applies a fitting force to the lower mating member. to move the upper member. At this time, by supplying air pressure to the hole of the member to be moved from the inside of the guide toward the outer periphery to position the heating member at the center of the guide,
Makes the insertion operation easier. In addition, by supplying air pressure, an air layer is created between the inner diameter of the member and the outer diameter of the guide, and the axes of both members that are shrink-fitted can be aligned accurately.

〔Example〕

Hereinafter, one embodiment of the present invention will be explained with reference to FIGS. 1 to 5.

1 is a compressor section in which the spiral fixed scroll and orbiting scroll laps are engaged,
The crankshaft 2 inserted into the orbiting bearing of the orbiting scroll is supported by a bearing provided on the frame, and a rotation prevention mechanism is provided on the back surface of the orbiting scroll.

3 is the rotor of the electric motor, which is in a heated state. 4 is a stator. 6 is a closed container for the compressor section 1;
This shows a state in which the stator 4 is fixed. The closed container 6 is positioned by a positioning member 5 and set at a predetermined position. A pallet 21 is formed integrally with the positioning member 5.

22 are chain conveyors arranged in two rows, connected to a drive device (not shown), and mounted so that the pallets 21 can be placed thereon and moved. 29 and 30 are palette 21
This is the positioning hole. Reference numerals 23 and 24 indicate positioning cylinders, which are provided with pins 25 and 26 so as to be movable in the vertical direction, and are driven, for example, hydraulically. When the pins 27 and 28 are inserted into the holes 29 and 30 at the tips of the pins 25 and 26, the pallet 2
Position 1.

Reference numeral 33 denotes a slat plate, which can be moved over the receiving plate 38 by rollers 331 attached to the slat plate 33. Each slat plate 33 is connected by a chain 34,
It is connected to a drive device (not shown), and a slat plate 33 is mounted so as to be movable and rotatable.

A pedestal 34 is attached to the upper part of the slat plate 33. 341 is a hole provided through the pedestal 34. 35 is a heating coil and cylinder 35
1 and both ends thereof are connected to an oscillator 37 installed in a heating device 371 via a terminal block 352.

36 is configured to be hydraulically driven by a push-up cylinder, and via a bracket 361,
It is attached to a pillar 60.

362 is attached by a rod so as to be movable in the vertical direction within the cylinder 36, and has a watzpere 363 and a pin portion 364 formed at its tip. It is inserted and rotor 3 is placed on it. The rotor 3 is moved by the operation of the piston 36.
It is pushed up to a position where it is easily heated by the coil 35.

Reference numeral 39 is connected to a rod 401 by a guide bar, and has the function of moving the rod 401 in the vertical direction using a cylinder 40. The cylinder 40 is fixed to a pedestal 45, and the pedestal 45 is fixed to a slide body 47 by a pillar 46. 42 is a vacuum pad that grips the heating member, sandwiching a cushioning material 43 and connected to a slide tube 44, the end of the slide tube 44 being connected to a rod 48;
A cylinder 49 allows movement in the vertical direction. The cylinder 49 is attached to the slide body 47. The slide body 47 has a base 50
It is attached so as to be slidable in the left and right direction along a slide rail 51 attached to the. The slide body 47 is connected to the rod 52 and the cylinder 5
3, and reciprocates between a position directly above the crankshaft 2 and a position above the center of the heating coil 35 that heats the heating member.

Reference numeral 54 denotes a vacuum outlet, which is connected to a vacuum generator via a hose (not shown).

55 is an air passage, although the end is not shown,
Connected to a high pressure air generator via a hose. The base 50 is fixed to a column 56.
This column 56 is attached to the mounting base plate 57 via the base plate 57.
is fixed.

In Fig. 2, 39 is a guide, and guide 3
An air passage 59 is provided on the outer periphery of the air passage 9, and a plurality of air passages 58 communicate with the air passage 55.

Next, its effect will be explained.

The rotor 3 of the electric motor is placed on the pedestal 34 of the slat plate 33 by another means, and the heating coil 3
The transfer is controlled so that it is positioned and stopped directly below 5. When the rotor 3 is transferred directly below the heating coil 35, the push-up cylinder 36 is operated to insert the pin portion 364 at the tip of the rod 362 into the hole 50 of the rotor 3, and place it on the washer 363. Push it further upward and insert it into the cylinder of the heating coil 35. At this position, the push-up cylinder 36 maintains a stopped state. Next, the oscillator 37 is operated to apply a high frequency current of about 25 KHz to the heating coil 35.
supply to. As a result, an induced current flows on the surface of the rotor 3 within the heating coil 35, generating Joule heat and causing the rotor 3 to generate heat. A detection means (not shown) detects that the rotor 3 has been heated to a predetermined temperature, or after a predetermined period of time has elapsed, the push-up cylinder 36 starts operating again and the rod 362 is further raised, and the heated rotor 3 is Wait for the next process operation. At this time, the push-up cylinder 36 maintains a stopped state. Operate the cylinder 53 and press the rod 5.
It is connected to 2. The guide 3 attached to the slide body 47 by moving the slide body 47
9 and the axis of the hole 50 of the rotor 3 are aligned. Next, the cylinder 40 is operated to lower the guide 39 connected to the rod 401, and the tip of the guide 39 comes into contact with the pin 364, which was previously inserted into the hole 50 of the heated and waiting rotor 3. At this position, the cylinder 40 remains stopped. Next, actuate the cylinder 49 to release the rod 4.
The vacuum pad 42 is lowered through the slide tube 44 and the buffer material 43 attached to the end of the rotor 8, and is stopped at a position where the outer peripheral end of the heated rotor 3 and the end of the vacuum pad 42 come into contact. In this state, a vacuum is drawn from the vacuum port 54 of the vacuum pad 42 via a hose (not shown) by a vacuum generator, and the heated rotor 3 is placed in a vacuum suction state. When the degree of vacuum within the vacuum pad 42 is sufficient to lift the rotor 3 is detected by a detection means (not shown), or after a predetermined period of time has elapsed, the cylinder 49 starts operating again and lifts the vacuum pad 4 while holding the heated rotor 3.
2 rises. Thereafter, the push-up cylinder 36 operates to lower the rod 362 to its lowest position. The slide main body 47 moves by the above-described operation. At the same time, the pallet 21 is positioned in advance.
The axial center of the crankshaft 2 of the compressor 1 fixed in the upper airtight container 6 is positioned so that the axial center of the guide 39 coincides with the axial center. Next, the guide 39 is lowered by the operation of the cylinder 40 until it comes into contact with the crankshaft 2 below. Maintain the stopped state in this position.

After this, it is held by suction with the vacuum pad,
The rotor 3 is lowered by actuation of the cylinder 49. In the state shown in FIG. 2, just before the rotor 3 enters the crankshaft 2, high-pressure air is guided from the air passage 55 to the air passage 58 and then to the air passage 59 through a hose (not shown) connected to a high-pressure air generator. is discharged into the hole 50 of the rotor 3.

This action is to center the hole 50 of the rotor 3 and the guide 39. Further, when the rotor 3 starts to be inserted into the crankshaft 2, high-pressure air also flows into the gap between the hole 50 of the crankshaft 2 and the rotor 3, and a centering effect is performed here as well.

Also, the reason why a buffer 43 is interposed between the vacuum pad 42 and the slide cylinder 44 is to ensure smooth centering by air pressure and to absorb slight misalignment between the crankshaft 2 and the guide 39. Therefore, the vacuum pad is floating. FIG. 3 shows a state in which the shrink fit has been completed. The time required for this shrink fit is several seconds. Further, the high pressure air is several kg/cm ² and does not require particularly high pressure.

The heated rotor 3 is pushed down to a predetermined position on the crankshaft 2, and the shrink fit is completed. When the shrink fit is completed, the vacuum pad 42 and guide 39 are raised.

In this way, the sealed container 6 with the rotor 3 fixed thereto by shrink-fitting is transferred together with the pallet 21 to the next assembly process by a chain conveyor.

Next, an automatic assembly process for the hermetic compressor, including the process of shrink-fitting the rotor 3 and crankshaft 2 described above, will be explained.

FIG. 5 shows an outline of the automatic assembly process of the hermetic compressor. FIG. 5a shows the process of preparing a compressor assembly in which the compressor section 1 and the crankshaft 2 are assembled.

FIG. 5b shows the centering of the compressor assembly and the motor stator 4 and the closed container 6 prepared in the previous step.
The figure shows the fixing process by welding with. For centering, first center the crankshaft 2 using a jig 10, then place another jig 1 on the outside of the jig 10.
1, and center the stator 4. When the centering of both is completed, the compressor assembly and the stator 4 are housed inside by covering the airtight container 6 from above and are fixed by shrink fitting. Then, the outer periphery of the compressor section 1 and the hermetic container 6 are welded and fixed at a point 7 from the outside of the hermetic container 6.

When the welding and fixing is completed, the jigs 10, 1
Take out 1 and move to the next process.

FIG. 5c shows a state in which the rotor 3 is fixed to the crankshaft 2 by shrink fitting. The shrink fitting method and apparatus are as described above. In other words, the feature of this process is that the rotor 3 and the crankshaft 2 are shrink-fitted in the same manner as conventionally, in order to eliminate the work of reversing the sealed container, the crankshaft 2 is turned downward and the rotor 3 is pushed up and shrink-fitted. In contrast to the conventional method, the present invention has the crankshaft 2 facing upward, and the rotor 3 heated from above is shrunk and fixed while being centered by air pressure. This point is that when automatically assembling a hermetic compressor, the assembly time is reduced by assembling the parts from above, and compared to the conventional method of downward assembly, where the equipment is located at the bottom. Easy to maintain. Although not shown, in the previous process, the axial center of the stator 4 and the compressor section 1 was measured after the shrink fit and the rotor 3 was fixed, and the stator 4 and the rotor 3 were measured after the rotor 3 was shrink fit.
Gap measurement becomes easier and automation of measurement becomes possible. Inversion techniques are now no longer a difficult problem.

FIG. 5d shows the process of welding the entire circumference of the cap 8, cap 12 and the closed container 6 at point 9 to seal them.

According to this embodiment, the rotor can be shrunk-fitted by pressing down from above, which improves workability and facilitates automatic assembly. Furthermore, since assembly accuracy can be measured from above in the previous and subsequent processes, automation becomes easier.

〔Effect of the invention〕

According to the present invention, it is possible to obtain a rotor shrink fitting method and apparatus suitable for automatic assembly of a hermetic compressor.

[Brief explanation of the drawing]

FIG. 1 is a schematic overall view of one embodiment of the present invention, and FIG.
The figure is an enlarged cross-sectional view of the main part showing the initial state diagram during the shrink-fit process, Figure 3 is an enlarged cross-sectional view of the main part showing the state diagram at the end of the shrink-fit process, and Figure 4 is the figure 2. A-A of
The sectional view, FIG. 5, shows a conceptual diagram of the automatic assembly process. DESCRIPTION OF SYMBOLS 1... Compressor part, 2... Crankshaft, 3... Rotor, 4... Stator, 5... Positioning member, 6
... airtight container, 8 ... cap, 12 ... cap, 21 ... pallet, 22 ... chain conveyor, 23, 24 ... positioning cylinder, 35 ...
Heating coil, 36... Push-up cylinder, 37...
Oscillator, 38... pedestal, 39... guide bar, 4
2... Vacuum pad, 40, 49, 53... Cylinder, 47... Slide body, 51... Guide rail.

Claims (1)

[Claims] 1. In a device in which one of two members is heated and fixed by shrink fitting, air pressure is applied from the center to the outer periphery of the fitting guide of one of the heating members to be fixed by shrink fitting to guide the heating member. 1. A method for shrink-fitting members, which comprises pressing a heating member from above while positioning the member at the center of the member, thereby firmly fitting and shrink-fitting the member. 2. In a device that heats and shrink-fits one of two members, a heating device that heats one of the members to be shrink-fitted, and a transfer and fitting device that transfers the heating member to a predetermined position. , a fixing device for fixing and positioning the other shrink-fit fitting member below the heating member transferred to the predetermined position; Shrink fit fitting force applying means for guiding the heating member to the fitting portion of the mating member and applying a shrink fit fitting force; and a device for supplying air pressure from the inside of the guide to the outer periphery of the hole to position the heating member at the center of the guide.