JP5954707B2 - Center of mass measuring machine - Google Patents

Description

  The present invention relates to a center-of-mass measuring machine for measuring the center of mass of a rotating body to be centered.

The center-of-mass measuring machine is a machine also referred to as a mass centering device, a mass centering machine, or the like. It is a device that can measure the deviation.
The center-of-mass measuring instrument is usually provided with a pair of rotary gripping disks that grip and rotate synchronously with the material surfaces of the rotary shafts at the left and right ends of the rotating body to be centered. Each of the pair of rotary gripping disks is provided with a bearing device for receiving the shaft end portion of the rotating body and a clamp device for fixing the shaft end portion received by the bearing device.

The bearing device is positioned at a predetermined position with respect to the rotation center of the rotary gripping disk, and is adjusted so that the axial center end of the rotating body to be centered and the rotation center of the rotary gripping disk substantially coincide with each other. Yes.
In other words, a dedicated bearing device that matches the shaft diameter of the rotating body to be centered is used as the bearing device.

For this reason, when the type of the rotating body to be centered changes, it has to be replaced with a different bearing device in accordance with the shaft diameter of the rotating body, and there is a problem that it takes time to change the setup.
In order to solve such a problem, for example, a structure including a cylinder unit in a bearing device as described in Patent Document 1 has been put into practical use. In such a configuration, by displacing the cylinder unit, the center of mass at the time of rotation of the rotary gripping disk changes, so the mass center measuring machine must be readjusted so that measurement can be performed in consideration of the change. However, there was still a problem that it took time to change the setup.

Japanese Patent No. 3432429

The present invention has been made to solve the problem that the setup change described in the background art takes time, and is capable of easily performing setup change when the rotating body to be centered changes. The main purpose is to provide a machine.
Further, the present invention provides a center-of-mass measuring machine that can be easily replaced by simply adjusting the provided parts without replacement parts when replacing the setup. The other purpose is to provide.

  The invention according to claim 1 for solving the above-mentioned problems is a vibration frame and a pair of rotary grips which are provided on the vibration frame and which rotate synchronously by gripping the material surfaces on the left and right sides of the rotating body to be centered. The rotary gripping disk includes a bearing unit that receives a rotating shaft of the rotating body, and the bearing unit rotates a pair of V-shaped bearing members and the pair of V-shaped bearing members. A parallel movement mechanism that translates in a symmetric direction around the rotation axis of the rotary gripping disk on a plane orthogonal to the rotation axis of the gripping disk, and a fixed that fixes the pair of V-shaped bearing members at a predetermined parallel movement position. And a mechanism for measuring the center of mass.

  According to a second aspect of the present invention, the pair of V-shaped bearing members includes a pair of slide plates capable of translating on a plane orthogonal to the rotation axis of the rotary gripping disk, and the parallel movement mechanism includes the pair of slide plates. 2. The center-of-mass measuring device according to claim 1, further comprising an eccentric cam that engages with the slide plate and moves the pair of slide plates in a symmetric direction about the rotation axis of the rotary gripping disk. .

  The invention according to claim 3 is the mass according to claim 2, wherein the eccentric cam is a cam that rotates about a rotation center, and has a symmetrical shape with respect to the rotation center. It is a central measuring machine.

  According to this invention, when the rotating body to be centered changes, the pair of V-shaped bearing members of the bearing unit are adjusted according to the rotating body. To adjust the pair of V-shaped bearing members, the fixing mechanism is loosened so that the pair of slide plates included in the pair of V-shaped bearing members can be translated, and the pair of slide plates are parallelized using the parallel movement mechanism. Move. Then, the set-up is completed by fixing with a fixing mechanism after the movement.

For this reason, in the present invention, it is not necessary to replace parts at the time of the setup change, and the setup change can be easily performed in a short time.
In addition, since there is no need to replace parts every time the setup is changed, it is not necessary to pay attention to management of replacement parts.

FIG. 1 is a front view of a center-of-mass measuring instrument 10 according to an embodiment of the present invention. FIG. 2 is a perspective view illustrating the bearing unit 27 attached to the rotating body gripping disk 25. FIG. 3 is a front view of the bearing unit 27 as viewed from the front end side. FIG. 4 is a right side view of the bearing unit 27. FIG. 5 is a front view of the bearing unit 27 as seen from the front end side, and is a view showing a state in which the bearing unit 27 is adjusted so that a rotating body having a relatively large shaft diameter can be received. FIG. 6 is a view of the eccentric cam 40 as viewed from below. FIG. 7 is a vertical cross-sectional view of the right mount 15. FIG. 8 is a front view for explaining the engagement relationship between the slide plates 31 and 32 and the eccentric cam 40. FIG. 9 is a partial longitudinal sectional view of the bearing unit 27 and the rotating body gripping disk 25 drawn to explain the fixing shafts 61 and 62. FIG. 10 is a plan view showing the relationship between the fixing shafts 61 and 62 and the operation lever 65.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a front view of a center-of-mass measuring instrument 10 according to an embodiment of the present invention. The center-of-mass measuring machine 10 has a vibration frame 13 supported on a base 11 by a plurality of springs 12. On the vibration frame 13, a left frame 14 and a right frame 15 are provided on the left and right. The left gantry 14 and the right gantry 15 have a symmetrical structure, and both have substantially the same configuration.

That is, the left gantry 14 and the right gantry 15 are mounted on a guide rail 16 provided on the left upper surface of the vibration frame 13 and a guide rail 16 provided on the right upper surface of the vibration frame 13, respectively. It is slidable and can be positioned and fixed at any position.
The left gantry 14 and the right gantry 15 respectively include a base 17 that engages with the guide rail 16, a spindle unit 18 provided on the base 17, and a vertical frame 19 that is attached to the rear portion of the spindle unit 18 and extends upward. And a motor 20 attached to the upper part of the vertical frame 19. The rotational force of the motor 20 is transmitted from the motor-side pulley 21 to the spindle-side pulley 23 via the belt 22, and the spindle 24 extending horizontally in the left-right direction in the spindle unit 18 can be rotated.

A rotating body gripping disk 25 that is rotated by the spindle 24 is provided at the tip of the spindle 24 that protrudes from the tip of the spindle unit 18.
On the front surface side of the rotating body gripping disk 25, that is, on the front surface side facing each other, the end of a rotating body 26 to be centered, for example, an engine crankshaft 26 integrally formed by casting or forging is received. And a clamp unit 28 for pressing and fixing an end of a rotating body (for example, a crankshaft) 26 received by the bearing unit 27 in the direction of the bearing unit 27.

  In the center-of-mass measuring instrument 10, one end (left end) of a rotating body (for example, crankshaft) 26 to be centered is placed on a bearing unit 27 provided on the rotating body gripping disk 25 of the left gantry 14, and the others. The end (right end) is placed on a bearing unit 27 provided in the rotating body gripping disk 25 of the right gantry 15. And it clamps with the clamp unit 28 provided in each rotary body holding | maintenance disk 25. FIG.

  In this state, the motors 20 of the left gantry 14 and the right gantry 15 are synchronously rotated, whereby the spindles 24 of the spindle units 18 of the left and right gantry 14, 15 are synchronously rotated, and the rotating body gripping disk 25 of the left gantry 14 and The rotating body gripping disk 25 of the right gantry 15 rotates synchronously. That is, both ends of the rotating body (crankshaft) 26 are gripped by the pair of rotating body gripping disks 25 and rotated together with the pair of rotating body gripping disks 25.

In FIG. 1, for convenience of understanding, the integrally rotated elements are colored light gray.
At this time, if there is a deviation between the center of inertia of the rotating body (crankshaft) 26 and the center of rotation, a reaction proportional to the deviation occurs and the vibration frame 13 vibrates. The vibration of the vibration frame 13 is detected by a vibration detector (pickup) (not shown), and the amount of deviation between the center of inertia of the rotating body (crankshaft) 26 and the rotation center can be measured.

One of the features of the center-of-mass measuring machine 10 according to the present invention is that the bearing unit 27 provided in the rotating body gripping disk 25 is improved, and the bearing unit 27 receives a plurality of types of rotating bodies 26 having different shaft diameters. It is made into the structure which can be adjusted so that it may be. This point will be described in detail below.
FIG. 2 is a perspective view illustrating the bearing unit 27 attached to the rotating body gripping disk 25. FIG. 3 is a front view of the bearing unit 27 as viewed from the front end side, and FIG. 4 is a right side view of the bearing unit 27. FIG. 5 is also a front view of the bearing unit 27. In FIGS. 2 to 5 and the drawings for explaining the bearing unit 27 alone, which will be described later, the front surface of the bearing unit 27 is a surface different from the front surface of the mass center measuring machine 10 shown in FIG. I do n’t agree with that, so I ’ll tell you just in case.

2 to 5, the bearing unit 27 is attached to the mounting base 30, a pair of slide plates 31 and 32 provided on the front end surface of the mounting base 30, and the upper portions of the pair of slide plates 31 and 32. And a pair of bearing pieces 33 and 34 disposed so as to face the V shape.
The mounting base 30 includes, for example, a trapezoidal prism-shaped base 35 and a mounting guide 36 having a substantially L shape in side view connected to the tip of the base 35.

  The pair of slide plates 31 and 32 are held at their lower ends by the mounting guide 36 and are slidable and displaceable along the front surface of the mounting guide 36 in the directions of arrows A1-A2 so as to be separated from each other. In the state where the pair of slide plates 31 and 32 are moved in the direction of the arrow A2 and displaced to the positions close to each other, as shown in FIG. A diameter rotating body 26 can be received. Further, when the slide plates 31 and 32 are moved away from each other in the direction of the arrow A1, as shown in FIG. 5, the interval between the upper edges of the bearing pieces 33 and 34 is increased, and the rotation of the relatively thick shaft diameter is performed. The body 26 can be received.

  Further, the center of mass of the bearing unit 27 is prevented from changing on the rotating body gripping disk 25 even when the pair of slide plates 31 and 32 is in the close position shown in FIG. 3 or in the separated position shown in FIG. ing. Thus, even if the pair of slide plates 31 and 32 are slid, the mass of the rotating body (crankshaft) 26 having different shaft diameters does not affect the center of mass of the rotating body gripping disk 25 during rotation. It has the advantage that the setup change to deal with the center measurement can be made easily.

The sliding movement of the pair of slide plates 31 and 32 is fitted into the oblong operation holes 37 and 38 that are long in the vertical direction formed in the center portion in the left-right direction when the plates 31 and 32 are viewed from the front. This is realized by the eccentric cam 40.
FIG. 6 is a view of the eccentric cam 40 as viewed from below, and the left side in FIG. 6 indicates the front side of the bearing unit 27. As shown in FIG. 6, the eccentric cam 40 includes a first cam portion 41 that fits in the operation hole 37 of the slide plate 31 and a second cam portion 42 that fits in the operation hole 38 of the slide plate 32. It is a cam integrated in The first cam portion 41 and the second cam portion 42 are eccentric in directions different from each other by 180 ° with respect to the central axis. A shaft 43 extending rearward is connected to the central axis of the eccentric cam 40, and a second gear 44 having the number of teeth N (N is a natural number) is attached to the rear end of the shaft 43. The second gear 44 is meshed with the first gear 45 having a circumference twice that of the gear and having 2N teeth. An operation shaft 46 extending rearward is connected to the first gear 45.

In FIG. 6, reference numerals 47 and 48 indicate bearings, respectively.
FIG. 7 is a vertical cross-sectional view of the right mount 15. As shown in FIG. 7, the operation shaft 46 extends right and left in the center of the spindle unit 18, and an operation handle 49 is attached to the right end that is the rear end.

  In the spindle unit 18, an operation shaft 46 extends so as to penetrate the center of the spindle 24 concentrically. The spindle 24 and the operation shaft 46 are provided independently with respect to rotation. That is, the spindle 24, the spindle-side pulley 23 attached to the rear end side thereof, and the rotating body gripping disk 25 attached to the front end side thereof are rotated integrally by the driving force of the motor 20. On the other hand, the operation shaft 46, the operation handle 49 attached to the rear end side thereof, and the first gear 45 attached to the front end side thereof can be rotated to change the setup when the spindle 24 stops rotating. is there.

FIG. 8 is a front view for explaining the engagement relationship between the slide plates 31 and 32 and the eccentric cam 40, and the slide plates 31 and 32 when the pair of slide plates 31 and 32 are in the state shown in FIG. 32 shows the engagement relationship between the eccentric cam 40 and the left slide plate 31 (FIG. 8A) and the right slide plate 32 (FIG. 8B).
As shown in FIG. 8A, in the operation hole 37 of the left slide plate 31, the first cam portion 41 of the eccentric cam 40 has a wide portion on the right side and a narrow portion on the shaft 43 that is the rotation center. It is in the state located on the left side. On the other hand, as shown in FIG. 8B, the engagement relationship between the operation hole 38 of the right slide plate 32 and the second cam portion 42 of the eccentric cam 40 is the second cam on the right side with respect to the shaft 43 that is the rotation center. The narrow part of the part 42 is located on the left side of the wide part of the second cam part 42.

A spring unit 50 is mounted on the pair of slide plates 31 and 32, and the spring unit 50 always applies an elastic force in the separating direction between the pair of slide plates 31 and 32. And the elasticity of the direction which presses a pair of slide plates 31 and 32 against the attachment guide 36 is added.
6 to 8, in order to slide the pair of slide plates 31, 32, the operation handle 49 is operated, and the operation shaft 46 is rotated by 90 °. By this rotation, the first gear 45 rotates 90 °, and the rotation rotates the second gear 44 180 °. The rotation of the second gear 44 is transmitted to the eccentric cam 40 via the shaft 43, and the eccentric cam 40 is rotated 180 °. Thereby, the eccentric cam 40 is inverted 180 ° from the state of FIG. 3 to the state of FIG. 5, for example. As a result, for example, the pair of slide plates 31 and 32 is switched from the close position to the separated position.

In order to slide the pair of slide plates 31 and 32 in the reverse direction, the operation handle 49 may be operated to rotate the operation shaft 46 by 90 ° in the reverse direction.
In relation to the pair of slide plates 31 and 32, the following configuration is further provided as a configuration for assisting the slide movement.
With reference to FIGS. 2 to 5 and 8, when the slide plates 31 and 32 are viewed from the front, laterally long guide holes 51, 52, 53, 54 are provided on the left and right sides with respect to the operation holes 37, 38. A guide pin 55 projecting forward from the front surface of the mounting guide 36 passes through the guide holes 51 and 53, and a guide pin 56 passes through the guide holes 52 and 54. The guide holes 51 to 54 and the guide pins 55 and 56 make the sliding of the pair of slide plates 31 and 32 smooth.

Further, although not shown, a disc spring is interposed between the guide pins 55 and 56 and the slide plate 32 on the front side. This prevents play from occurring on the slide plates 31 and 32 when the fixing shafts 61 and 62 described below are loosened.
Further, when the pair of slide plates 31 and 32 are viewed from the front, the fixing holes 57, 58, 59, and 60 are located above the guide holes 51 to 54 in symmetrical positions around the operation holes 37 and 38. A pair of left and right fixing shafts 61 and 62 are provided through the fixing holes 57, 5859 and 60. The fixing holes 57 to 60 are also horizontally long holes so as not to prevent the pair of slide plates 31 and 32 from sliding in the lateral direction.

FIG. 9 is a partial longitudinal sectional view of the bearing unit 27 and the rotating body gripping disk 25 drawn to explain the fixing shafts 61 and 62. FIG. 10 is a plan view showing the relationship between the fixing shafts 61 and 62 and the operation lever 65.
As shown in FIG. 9, nuts 66 are screwed onto the tips of the fixing shafts 61 and 62. The rear of the fixing shafts 61 and 62 extends horizontally in the bearing unit 27, passes through the rotating body gripping disk 25 in the front-rear direction, and reaches the rear of the rotating body gripping disk 25.

  In addition, a flange pipe 67 is fixed to a middle portion in the length direction of the fixing shafts 61 and 62 in order to define a forward protrusion amount from the front surface of the rotating body gripping disk 25. A coil spring 68 is externally fitted to the outer peripheral surfaces of the fixing shafts 61 and 62 extending rearward from the flange pipe 67, and a nut 69 is screwed to the rear end portions of the fixing shafts 61 and 62. 68 is preloaded.

The operation lever 65 is fixed to a central portion in the length direction of a support shaft 70 extending in a direction orthogonal to the fixing shafts 61 and 62. Cams 71 are fixed to both ends of the support shaft 70. Further, the support shaft 70 is rotatably held on the spindle unit 18 side so as not to hinder the rotation of the rotating body gripping disk 25.
When the pair of slide plates 31 and 32 are slid, that is, in the bearing unit 27, when the type of the rotating body (rotating body to be centered) 26 to be received changes and the setup is changed, the operation lever 65 is In FIG. 9, for example, 90 ° rotation operation is performed counterclockwise about the support shaft 70. As a result, the cam 71 pushes the rear end portions (the right end portions in FIGS. 9 and 10) of the fixed shafts 61 and 62 forward (to the left). The fixing shafts 61 and 62 are slightly displaced forward (leftward) while the coil spring 68 is contracted by being pressed by the cam 71. As a result, the fixing force of the fixing shafts 61 and 62 fixing the slide plates 31 and 32 is loosened, and the pair of slide plates 31 and 32 can be slid.

  After the pair of slide plates 31 and 32 is slid, the operation lever 65 is rotated to the original state (the state shown in FIG. 9), so that the cam 71 presses the rear end portions of the fixing shafts 61 and 62. The pressing force to be released is released. As a result, the fixing shafts 61 and 62 are slightly displaced rearward (rightward) by the elasticity of the coil spring 68, and the pair of slide plates 31 and 32 are fixed at the tip portions thereof. In addition, the fixing shafts 61 and 62 are elastically biased rearward (rightward) by the force of the coil spring 68, so that the pair of slide plates 31 and 32 are securely fixed. Therefore, troublesome operations such as loosening or tightening the nut are unnecessary.

This embodiment has the above-described configuration, and in the center-of-mass measuring instrument 10, the rotating body to be received (rotating body to be centered) in the bearing unit 27 provided in the rotating body gripping disk 25. When the shaft diameter of 26 changes, the setup can be easily changed.
In this embodiment, the configuration in which the pair of slide plates 31 and 32 are slid and moved into two states by the eccentric cam 40 has been described. However, for example, the eccentric cam 40 is changed to a cam in which the amount of eccentricity is changed to three stages or to four stages. By using the cam, the position of the pair of slide plates 31 and 32 can be adjusted not only in two stages but also in three stages and four stages, and three or more types of rotating bodies 26 having different shaft diameters can be received. Thus, it can be set as the structure which can carry out setup change easily.

Further, in this embodiment, since the operation of the eccentric cam 40 can be operated with the operation handle 49 provided on the rear side of the gantry 14, 15, the operation of the eccentric cam 40 can be easily performed, and the setup can be changed. It can be set as the mass center measuring device 10 which can be performed more simply.
The present invention is not limited to the embodiment described above, and various modifications can be made within the scope of the claims.

DESCRIPTION OF SYMBOLS 10 Mass center measuring machine 11 Base 12 Spring 13 Vibration frame 14 Left frame 15 Right frame 18 Spindle unit 24 Spindle 25 Rotating body gripping disk 27 Bearing unit 28 Clamp unit 30 Mounting base 31, 32 Slide plate 33, 34 Bearing side 40 Eccentricity Cam 41 First cam portion 42 Second cam portion

Claims (3)

A vibration frame;
A pair of rotary gripping disks provided on the vibration frame and configured to grip and rotate the material surfaces on both the left and right sides of the rotating body to be centered;
The rotating gripping disk is provided with a bearing unit that receives a rotating shaft of the rotating body,
The bearing unit includes a pair of V-shaped bearing members;
A translation mechanism that translates the pair of V-shaped bearing members in a symmetrical direction around the rotation axis of the rotary gripping disk on a plane orthogonal to the rotation axis of the rotary gripping disk;
A center-of-mass measuring machine comprising: a fixing mechanism that fixes the pair of V-shaped bearing members at a predetermined parallel movement position. The pair of V-shaped bearing members includes a pair of slide plates capable of translating on a plane orthogonal to the rotation axis of the rotary gripping disk,
The parallel movement mechanism includes an eccentric cam that engages with the pair of slide plates and moves the pair of slide plates in a symmetric direction around a rotation axis of the rotary gripping disk. 1. The center-of-mass measuring machine according to 1.   3. The center-of-mass measuring machine according to claim 2, wherein the eccentric cam is a cam that rotates about a rotation center and has a symmetrical shape with respect to the rotation center.