JPS6130338A - Centering and assembling device - Google Patents

Abstract

PURPOSE:To improve assembling accuracy and operation efficiency by calculating the offset of the first shaft mounted vertically on a measuring stand from the position of a center push pin pushed against the center hole of the second shaft to correct the position of the first shaft. CONSTITUTION:After carrying out a master measuring process and storing the zero point of an offset, a rotor shaft 1, on which through vanes 3, 3' are joined and a rear shaft 2 is mounted and temporarily fixed, is mounted on a measuring stand 5, and when a starting button is pushed a fine control rod 13 for X, Y coordinate axes advances to a prescribed position. Sliders 7, 7' advance then, and a return rod 17 runs against the side of the rotor shaft 1 to press it against the rod 13. The shaft 1 therefore moves slightly to a position fixed by the rod 13. Then, detected values on four electric micrometers are read, and offsets on the X, Y coordinate axes are calculated from the detected values and the value at zero point of the offset. The rod 13 is then moved back and forth until the offset becomes 2mu or less. When the offset has been within the above values, a center push pin 21 goes down to push against the center hole of the shaft 2, and both shafts are fixed after cramped by an arm 23.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a shaft centering and assembly device.

For example, the rotor of a through-vane compressor is
As shown in FIG. 2, the through vanes 3, 3' are inserted into the rotor shaft 1, and the rear shaft 2 is fastened with bolts 4 to be assembled. This assembly requires extremely high coaxiality precision between the rotor shaft 1 and the rear shaft 7F2. The present invention relates to a centering and assembly device used for such assembly work.

[Jubei technology]

In Jube's centering and assembly equipment, a dedicated air micrometer is installed to measure each of the rotor shaft and rear shaft (7), and the actual shaft axis center relative to the reference is measured for each shaft. It is a device that repeatedly corrects the position in the X and Y directions, performs centering work, and when the mutual centers match, fastens with bolts, etc. (Automation Technology No. 14 @ No. 2, pages 100 to 105) [Invention [Problems to be Solved] Such devices have problems such as the errors of the two sets of air micrometers being added together, reducing the overall assembly accuracy, and the structure of the device being complicated and expensive. . Furthermore, since each of the two parts is measured independently and the centering adjustment is performed, there is a problem that mutual interference occurs, and the workability is poor as it takes more than 20 seconds for centering, making it unsuitable for mass production.

SUMMARY OF THE INVENTION In view of the above-mentioned points, an object of the present invention is to provide a centering and assembling device suitable for mass production, which has good precision, simple structure, and high workability. Therefore, the present invention focuses on the center hole of the shaft used as a reference hole during shaft polishing, and performs centering adjustment using a part of the taper of the center hole. The configuration is a centering assembly device for fastening and assembling a first shaft and a second shaft, and includes a measuring table on which the first shaft is placed vertically, and a first shaft placed on the measuring table. In order to detect the position of the side surface of the shaft, four position sensors are arranged around the first shaft at every 90 degrees, and the first shaft placed on the measuring table is placed on the measuring table. In order to press the fine-adjustment feed mechanism that moves minutely and the center presser pin, which has the same taper as the center hole of the second shaft 7F, into the center hole of the second shaft, it moves up and down on the extension of the center axis of the first shaft. and a clamp mechanism that presses and fixes the first shaft and the second shaft.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of a centering assembly device to which the present invention is applied. This embodiment is an apparatus for assembling the rotor section of a through vane compressor shown in FIG. A cylindrical measuring table 5 is fixed to a base 50. The measuring table 5 has a shelf portion 5A on the inside on which the rotor shaft 1 is placed. The shelf portion 5A is polished as a reference surface. Hereinafter, the plane parallel to this reference plane will be referred to as the X-Y plane, the left-right direction in the drawing will be referred to as the X-axis, and the front-back direction perpendicular to the drawing will be referred to as the Y-lees.

Along the X-axis, electric micrometers 6.6', which are position sensors, are arranged facing each other in order to detect the position of the circumferential surface of the rotor shaft 7) 1 placed on the shelf 5A of the measuring table 5. ing. One electric micrometer 6 is fixed to a slider 7, the slider 7 is held by an id 8 so as to be slidable left and right in the drawing, the id 8 is fixed to a support 9, and the support 9 is fixed to a base 50. There is. A slider 7 on which an electric micrometer 6 is mounted is driven left and right by an air ring 10 fixed to a support 9. A window is provided on the side surface of the measuring table 5 so that the measuring tip of the electric micrometer 6 can come into contact with the side surface of the rotor shaft 1. The other electric micrometer 6' similarly has a slider 7'.
The slider 7' is held slidably from side to side by a guide and door 8' fixed to the support 9', and the air cylinder 1
0'. A gear 11 is rotatably held by the support 9 via a bearing, and a feed screw 12 is screwed into the center of the gear 11. A fine adjustment rod 13 is fixed to the feed screw 12, and the fine adjustment rod 13 moves left and right according to the rotation of the gear 11 and is linearly positioned. The gear 11 is rotationally driven by a servo motor 15&2 via a gear 14. A window is provided on the side surface of the measuring table 5 so that the microprick rod 13 can come into contact with the side surface of the rotor shaft 1. An X-axis return rod 17 is attached to the slider 7' on the right side of the drawing so that it can slide left and right.
It is energized at 8.

Similarly, along the vertical direction (Y axis) of the drawing,
The feature consists of a Y-axis position sensor consisting of an electric micrometer attached to the slider arranged facing each other, a Y-axis fine adjustment rod driven by a servo motor, and a Y-axis return rod attached to the slider. An adjustment mechanism is provided.

A rear shaft 7F presser cylinder 22 is disposed above the measuring table 5 and is equipped with a center presser pin 21 arranged so as to coincide with the central axis of the measuring table 5 in order to press the center hole of the rear shaft 2. has been done.

The cylinder 22 is fixed to a support (not shown) fixed to the base 50. A clamp arm 23 that presses and clamps the rotor shaft 1 and rear shaft 2 against the measuring table 5 is swingably attached to the support (not shown) and is driven by a cylinder 24.

The driving direction of each air cylinder (10, 10', 22, 24 and two cylinders for Y-axis sligs (not shown) is switched by an electromagnetic valve in the cylinder control unit 31, and each electromagnetic pulp is controlled by an electronic control unit (ECU). ) 30. The outputs of the X-axis electric micrometer 6,6' and two Y-axis electric micrometers (not shown) are output to an electronic control unit (ECU) 30. The electronic control unit (ECU) 30 outputs drive control signals to each cylinder based on signals from these four position sensors and signals from an operation console (not shown) that outputs start signals, etc., and also controls the X-axis servo. The motor 15 and the Y-axis servo motor are driven and controlled so that the axial center of the rotor shaft 1 placed on the measuring table 5 coincides with the position of the center holding pin 21.

The operation will be explained with reference to charts 70 in FIGS. 3 and 4. Prior to the start of assembly work, a master measurement process shown in FIG. 3 is executed.

The master measurement process is started by placing a master, which serves as a standard for the coaxiality of the rotor shaft 1 and the rear shaft 2, on the measurement table 5 and pressing a start button on an operation console (not shown). In step 303, the cylinder 22 is driven, and the center presser pin 21 descends to press the center hole of the master. At this time, as shown in Fig. 5, when the taper part of the center holding pin 21 and the taper part of the center hole of the rear shaft 2 collide, and the center is off, the pressing is done horizontally perpendicular to the direction. Resilient force acts in the direction, and the master moves on the measuring table 5 until the center axis coincides with the position of the center holding pin 21. Next, in step 304, the cylinder 24 is driven and the clamp arm 23 is lowered to press and clamp the master onto the measuring table 5. Then, in step 305, the cylinders 10, 10', etc. are driven, and the sliders 7, .
7' and two sliders on the Y axis (not shown) move forward,
The probe of an electric micrometer fixed to each slider is brought into contact with the circumferential side of the master to detect the position of the side (see FIG. 6). Next, in step 306, the detection values (X, , X, , Yl, Yl) of the four electric micrometers arranged oppositely along the X and Y axes are read. Next, in step 307, the zero points of the deviation of each axis, ΔX0=X, -X, and ΔY o = Y +
Y 2 is calculated and stored in memory. As a result, the deviation of the X-axis and Y-axis when the central axis of the rotor shaft 1 coincides with the position of the center holding pin "21," that is, the zero points of the deviation ΔX0 and ΔY0, are measured and stored.

Next, in step 308, the slider retreats to release the measuring tip of the electric micrometer from the master, and the center presser pin 21 and clamp arm 23 are raised to complete the master measurement process.

The master measurement process is executed and the zero point of deviation ΔX0, ΔY0
After this is stored, the final rotor assembly process shown in FIG. 4 is executed. Through vane 3 on rotor shaft 1.
3' are assembled, the rear shaft 2 is mounted, and the bolts 4 are loosely and temporarily fastened, and then placed on the measuring table 5, and by pressing a start button on an operation console (not shown), the centering assembly process is started.

At step 403, the X-axis fine adjustment feed motor 15 is driven, and the X-axis fine adjustment rod 13 is advanced by a predetermined position fit. The Y-axis fine adjustment rod (not shown) also moves forward in the same way. Then, in step 404, shillings 10.
10' is driven, and the slider 7.7' moves forward. As the slider 7' advances, the return rod 17 comes into contact with the side surface of the rotor shaft 1, and the compressive force of the spring 18 presses the rotor shaft 1 against the fine adjustment rod 13. Similarly, a Y-axis adjustment rod (not shown) presses the rotor shaft 1 against the Y-axis fine adjustment rod. Therefore, the rotor shaft 1 slides on the measuring table 5 and moves slightly to the position determined by the fine adjustment rod. Next, in step 405, the detection values (X, , X2, Yl, Y2) of the four electric micrometers arranged oppositely along the X and Y axes are read. Next, in step 406, the X-axis deviation amount ΔX=XI calculate. Next, in steps 407 to 413, it is determined whether the absolute values of the deviation amounts ΔX and ΔY are 2 μ or less, and if the deviation amounts are 2 μ or more, the X-axis fine adjustment rod or Y-axis fine adjustment rod is adjusted to that deviation amount. Only the suitable scenery is moved forward or backward according to the sign, and the process returns to step 405 again. XI
From step 405 to step 414 until the deviation amount of I# and Y Yuzu becomes 2μ or less! A is fed back one after another and n is returned. When the amount of deviation becomes 2 μ or less, the process proceeds to step 415. At step 415, the sill 22 is driven, and the center presser pin 21 descends to press the center hole of the abutment 2.

At this time, as shown in FIG. 5, a part of the taper of the center holding pin 21 and a part of the taper of the center hole of the shaft 7 abut, and a horizontal thrust force f# is applied to the rear shaft 2. ) 1 so that the axial center of the rear shaft 2 and the center holding pin 21 are aligned. Therefore, the axial center of the rotor shaft 1 and the axial center of the shaft 7 2 coincide with each other. Then, in step 416, 2 shillings
4 is driven, the clamp arm 23 descends and presses the rear shaft 2. Next, in step 417, the operator tightens the bolts 4 to fix the rear shaft 2 to the rotor shaft 1. Then, in step 418,
The axis fine adjustment rod 13 and the Y-axis fine adjustment rod (not shown) move backward. Next, in step 419, the center presser pin 21 is raised, the slider is retreated to release the electric micrometers on each axis, and the clamp arm 23 is raised to complete the rotor assembly process.

In this embodiment, variations in the diameter of the rotor shaft 1 are absorbed by moving the fine adjustment rod, and the variation in the diameter of the rotor shaft 1 is absorbed.
The center of the axis can be aligned with the position of the center holding pin 21 with an accuracy of 2μ or less. On the other hand, since the center hole of the rear shaft 2 is used as a reference hole during polishing, the concentricity with the peripheral side surface of the center hole holder 7F is very high, and the center hole is pressed with the center holding pin 21. Thereby, the axial center of the rear shaft 2 and the center holding pin 21 can be easily aligned. Therefore, it was possible to stably achieve the coaxiality of 10 μm or less, which is required when assembling the rotor shaft 1 and the rear shaft 2. Furthermore, since no measurement is required for centering the rear shaft 2, there is an advantage that the time required for centering is very short.

In the embodiments described above, an example was described in which the fine adjustment rod is composed of a fine adjustment rod and a return rod for linear positioning. As schematically shown in FIG. 7, it is also possible to configure the fine adjustment feeding mechanism to consist of an eccentric disk 41, 41' and a return rod 17, 17'. The eccentric disk 41, 41' is fixed so that its rotating shaft 42, 42' is eccentric about 1 mII from the center of the disk (the eccentricity is exaggerated in the drawing). Return rod 1 biased by spring 18.18'
7.17' press the rotor shaft 1 against the respective opposite discs 41,41'. Rotating shaft 42.42'
The rotor shaft 1 can be moved slightly by rotating the rotor shaft 1 with a servo motor (not shown) and determining the angular position.

The micro-feed mechanism consisting of an eccentric disk has the advantage that it has a simple structure because it does not require a linear drive part such as a feed screw and only needs a rotary drive part, and can easily be manufactured with high rigidity.

In addition, a servo motor is used to drive the eccentric disk, and an ordinary DC motor is used to drive the disk in forward and reverse directions at a constant rotation speed.
In the process corresponding to
It is also possible to adopt a system in which the camera stops when 1ΔY becomes 2μ or less. This method has the advantage that the structure of the eccentric disk driving section and the electronic control device is simple.

[Other Examples]

FIG. 8 shows an embodiment in which positioning and centering are performed manually without using a servo motor. A measuring table 5 and a stand 51 are mounted on a base 50. Four electric micrometers 6 for detecting the position of the circumferential surface of the rotor shaft 1 placed on the measuring stand 5 are arranged around the measuring stand 5. Below the electric micrometers 6, the rotor shaft 1 A fine adjustment feeding device 52 consisting of a rod-shaped micrometer is attached to push the side surface of the shaft and move it slightly. stand 51
A slider 53 is attached so as to be slidable up and down, and is moved up and down by a handle lever 54. A center holding pin 21 is fixed to the slider 53. Center presser pin 2
Position 1 is located between the center hole and the center holding pin 21 when the master for Rotan Sen7F is placed on the measuring table 4.
are installed so that their positions match perfectly. A clamp arm 23 is swingably attached to a stand 51 and is moved up and down by a sill 55.

In the rotor assembly procedure, the rotor shaft 1 is placed on the measuring table 5, and based on the readings of the four electric micrometers 6, the fine adjustment feed device 6 is operated to slightly move the rotor shaft 1 for centering. Next, raise the rear shaft 7) 2, operate the handle lever 54, and move the center presser pin 21 to the rear shaft 2.
The center hole of the rear shaft 2 is pressed against the center hole of the center hole, and the center of the rear shaft 2 is centered by abutment between a tapered portion of the center hole and a tapered portion of the center holding pin 21. Next, the cylinder 55 is activated to lower the clamp arm 23 and clamp the rear shaft 2. In this state, rotor shaft 1 and rear shaft 2
Tighten with bolt 4 to complete the assembly.

〔Effect of the invention〕

As explained above, since the present invention utilizes the center hole of the shaft, the structure is simple, the coaxiality accuracy required for shaft assembly can be easily achieved in a short time, and the workability is improved. It has excellent effects such as being expensive and suitable for mass production.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing an embodiment of the present invention, Fig. 1 is an exploded perspective view of the eye, Fig. 3 and Fig. 4 are flowcharts for explaining the operation of this embodiment, and Fig. 5 is a center presser pin. FIG. 6 is an explanatory diagram showing the alignment with the center hole, FIG. 6 is an explanatory diagram showing the arrangement of the position detector, FIG. 7 is a configuration diagram showing an embodiment of the fine adjustment feed mechanism, and FIG. 8 is a diagram showing the second embodiment. FIG. 1... Rotor shaft, 2... Rear shaft, 3.
3'... Through vane, 4... Volt, 5... Measuring stand, 6.6'... Electric micrometer, 7,7'.
...Slider, 13...Fine adjustment rod, 17...Return rod, 18...Spring, 21...Center holding pin, 23...Clamp arm, 30...Electronic control unit (ECU). ;(;,-...,゛Fig. 2, 3M, Fig. 5, 6M, 7M, Y Fig. 8

Claims (1)

[Scope of Claims] 1. A centering and assembling device for fastening and assembling a first shaft and a second shaft, comprising a measuring table on which the first shaft is vertically placed, and a measuring table placed on the measuring table. In order to detect the position of the side surface of the first shaft, four position sensors are arranged around the first shaft at every 90 degrees, and the first shaft placed on the measuring table is measured. A fine adjustment feed mechanism that moves slightly on the table, and a center presser pin that has the same taper as the center hole of the second shaft, is placed on the extension of the center axis of the first shaft in order to press it against the center hole of the second shaft. A centering assembly device comprising: a center holding mechanism that moves the shaft up and down, and a clamp mechanism that presses and fixes the first shaft and the second shaft. 2. The fine adjustment feed mechanism includes a fine adjustment rod that is linearly positioned by a motor, and a return rod that is disposed opposite to the fine adjustment rod so as to press the first shaft against the fine adjustment rod. The centering and assembly device according to scope 1. 3. The fine adjustment feeding mechanism includes an eccentric disk that is angularly positioned by a motor, and a return rod that is disposed opposite to the eccentric disk to press the first shaft against the eccentric disk. A centering and assembling device according to claim 1. 4 Calculate the amount of deviation of the center axis position of the first shaft from the center presser pin position from the position of the side surface of the first shaft detected by the four position sensors, and adjust the fine adjustment feed based on the calculation result. 4. The centering and assembly apparatus according to claim 1, further comprising an electronic control device that drives the mechanism and corrects the first shaft mounting position.