JPH02165028A - Dynamic balance tester - Google Patents

Abstract

PURPOSE:To perform many kinds of a test and to facilitate maintenance by making the interval between stands adjustable and providing unbalance detection means to the respective stands. CONSTITUTION:The interval between stands 2, 3 is adjusted by the rotation of a motor 43 and an object 10 be tested is placed on rollers 8, 28 to perform a dynamic balance test. Since the rollers 8, 28 are provided through a spline shaft 13 and rotated at a synchronous speed, unbalance can be accurately measured. When the shaft diameter of the object 10 to be tested is different according to a place, the number of the gears of timing pulleys 17, 32 are changed to change the rotational speed of the rollers 8, 28. Since the motor 12 and the shaft 13 are mounted to the fixed frames of the stands 2, 3, no useless vibration is transmitted to the vibration frame of each stand. Since the shaft 13 and a screw shaft 40 are provided above a bed 1, the maintenance around a peripheral bearing after the arrangement on the spot is easy. By this method, the dynamic balancing test of many kinds of the object to be tested can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a dynamic balance tester for performing a dynamic balance test on a Gf4C to be tested such as a crankshaft.

<Prior Art> A dynamic balance tester for measuring the unbalance of a test object such as a crankshaft is known. This type of dynamic balance testing machine has conventionally been equipped with two frames fixed to a bed at a constant interval, and each frame has been provided with a roller and a detector, respectively. Rollers are used to support objects under test such as crankshafts.
By rotating the roller, the supported test object is rotated. The unbalance of the rotating test object is then detected by a detector.

The two frames each support a specified shaft part of the test object, so the spacing between them corresponds to the length of the test object, and generally, the distance between the two stands corresponds to the length of the test object. Currently, a dynamic balance test machine is installed at the station. First, if you try to change the spacing between the frames attached to the bed, the timing pulley or other R
This is because the structure also has to be moved, which takes a lot of time.

In order to improve this situation, a dynamic balance tester described in Japanese Utility Model Publication No. 62-29937 has been proposed as a prior art that is of interest to the present invention. The dynamic balance tester described in the official gazette requires at least one mount to be tested.
By making the body movable in the axial direction, the spacing between the frames can be adjusted, making it possible to perform dynamic balance tests on test bodies of different lengths.

<Problems to be Solved by the Invention> The dynamic balance tester described in the above-mentioned public notice was tested in Ill!
Although it is possible to adjust the spacing between the frames according to the length of the body, the structure for adjusting the spacing between the frames is extremely complicated, and the power transmission mechanism for transmitting rotational force to the rollers of each frame is required. Since it is housed inside the bed, it has the disadvantage that maintenance etc. are difficult to perform.

Therefore, an object of the present invention is to provide a dynamic balance tester that can change the spacing between frames with a simpler structure.

Means for Solving the Problems> The present invention includes a bed, two or more plurality of pedestals erected on the bed, and a rotating shaft pivotally supported by the plurality of pedestals, At least one of the pedestals is movable relative to the bed,
Each of the plurality of frames supports a test object, and
A roller for rotating the test object and a detection means for detecting unbalance of the test object are provided, and any one of the plurality of stands includes:
a driving source; a first transmission mechanism for transmitting the driving force of the driving source to the roller provided on the pedestal; and a first transmission mechanism for transmitting the driving force of the driving source to the rotary shaft supported on the shaft. 2 transmission mechanism is provided, and among the plurality of mounts, each of the mounts other than the one provided with the drive source etc. transmits the rotational force of the rotary shaft supported thereon. A third
5. A transmission radius is provided. A spline or a key eraser is formed on the rotating shaft, and at least one of the second transmission mechanism and the third transmission mechanism
The dynamic balance testing machine is characterized in that it is movable in the axial direction of the rotating shaft along the spline or key.

Further, the present invention includes a bed and two or more plurality of mounts erected on the bed, and among the plurality of mounts,
At least one mount is movable with respect to the bed, and each of the plurality of mounts includes a roller for supporting a test object and rotating the test object, and a roller for supporting the test object and rotating the test object. It is characterized by being provided with a detection means for detecting an unbalance of the body, a drive source, and a transmission mechanism for transmitting the driving force of the drive source to the roller provided on the frame. This is a dynamic balance test machine.

In each of the dynamic balance test machines, a longitudinal member for adjusting a gantry interval is provided on the bed and is connected to the plurality of mounts, and the longitudinal member is screwed to at least one of the plurality of mounts. Preferably, by rotating the longitudinal member, the coupling position between the longitudinal member and the at least one pedestal to which the longitudinal member is screwed changes, thereby making it possible to move the at least one pedestal.

According to one aspect of the present invention, only one of the two or more frames is provided with a drive source, and the driving force of the drive source is transmitted through the first transmission mechanism. 1 which is transmitted to the roller of the mount and also transmitted to the roller of the other mount via the second transmission mechanism, the rotating shaft, and the third transmission mechanism.
A spline or key is formed on the rotating shaft,
The second or third transmission mechanism is movable along its spline or key. Therefore, even if the interval between the frames changes, the coupling relationship between the second transmission mechanism or the third transmission mechanism provided in the frames and the rotating shaft also moves without any problem.

According to another aspect of the present invention, each of the plurality of mounts is provided with a drive source, and the rollers of each mount are rotated by the drive source. Therefore, if the pedestal is moved, the rollers provided on the pedestal are moved to zero.
Drive source and transmission device for rotation! ! Move from 4.

According to a further aspect of the invention, two or more pedestals are connected by a longitudinal member for adjusting the pedestal spacing. When the longitudinal member is rotated, the coupling position of at least one screw-coupled pedestal and the longitudinal member changes, and the spacing between the plurality of pedestals changes.

<Examples> Examples of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a front view of a dynamic balance tester according to an embodiment of the present invention, FIG. 2 is a right side view thereof, and FIG. 3 is a left side view thereof. In FIGS. 1 and 2, parts that are necessary for explanation are partially cut away to show the internal structure, and parts that are not directly related to the structure of the invention (for example, mounting bolts, etc.) are shown. ) are omitted. Further, FIG. 3 is a diagram in which unnecessary parts for explanation are omitted.

This will be explained with reference to FIGS. 1 to 3. Bed 1 is
If necessary, it is fixed by, for example, being fixed to a foundation concrete block buried in the ground. Two frames 2 and 3 are erected on the bed 1. These two frames 2 and 3 are both movable along the surface of the bed 1 in the left-right direction indicated by arrow A1.

As shown in FIG. 2, the pedestal 2 includes a vibrating frame 4 provided on the upper side and a fixed frame 5 provided on the lower side, and a plate spring 6 is provided between the vibrating frame 4 and the fixed frame 5. .7, and the fixed frame 5 is disposed on the bed 1. Therefore, the vibrating frame 4 held by the plate springs 6.7 can vibrate in the front-back direction.

A pair of rollers 8.9 are rotatably provided on the vibrating frame 4 in the front-rear direction. These pair of rollers 8
, 9 are for supporting one end portion of the test object 10 such as a crankshaft. By rotating the pair of rollers 8.9, the test object 10 supported by the pair of rollers 8, 9 is rotated.

A mounting base 11 is fixed to the fixed frame 5 and projects rearward thereof, and a motor 12 as a drive source is provided on the mounting base 11. The motor 12 is connected to the pair of rollers 8 mentioned above.
, 9 and a spline shaft 13, which will be described later. Note that the motor 12 may include a gear mechanism or the like if necessary.

The rotational force of the motor 12 is transmitted to the rollers 8, 9 and the spline shaft 13 by a transmission mechanism consisting of a boob and a belt. More specifically, the fixed frame 5 is equipped with a drive pulley 14 and a guide pulley 15, and the vibrating frame 4 is equipped with a tension pulley 16. Also, roller 8
Timing pulleys 1 and 9 have timing pulleys 1 and 9 respectively.
7 and 18 are coupled, and a timing pulley 19 is coupled to the spline shaft 13. A timing belt 20 is placed around these drive pulley 14, guide pulley 15, tension pulley 16, and timing pulleys 17, 18, and 19. Further, the rotation shaft of the motor 12 is provided with a pulley 21, and the pulley 21 and the drive pulley 14
A belt 22 is placed between the two. Therefore, the rotational force of the motor 12 is transmitted to the drive boot 914 via the pulley 21 and the belt 22, and as the drive pulley 14 is rotated, the timing pulleys 17, 18, and 19 are rotated.
is rotated, and the rollers 8 and 9 and the tin line shaft 13 are rotated.

In this embodiment, the mechanism for transmitting the rotational force of the drive pulley 14 to the rollers 8 and 9 and the spline shaft 13 is provided by the timing belt 20 and the timing pulley 17,
18.19, but other belts, namely V
A belt or a flat belt and a matching bobbin may be used. Note that when a timing belt and a timing pulley are used, there is no slippage, so the rollers 8, 9 and spline shaft 13 can be accurately rotated at a predetermined synchronous speed. The advantage is that it can be done.

The pedestal 2 is further equipped with a pickup 23. The pickup 23 is for detecting the vibration of the vibrating frame 4 with respect to the fixed frame 5. Its main body is attached to the fixed frame 5, and the vibration detecting portion is in contact with the vibrating frame 4. Detection outputs from the two pickups are given to a vibration detection circuit (not shown).

The configuration of the pedestal 3 is basically the same as that of the pedestal 2, as shown in FIG. 3, and includes a vibration frame 24. Fixed frame 25. Two plate springs 2 connecting the vibrating frame 24 and the fixed frame 25
6,27. It consists of a pair of rollers 28 and 29 rotatably provided on the vibrating frame 24 and a pickup 30 for detecting vibrations of the vibrating frame 24. The difference between this pedestal 3 and the pedestal 2 is that it is not equipped with a motor as a drive source, and instead, a pair of rollers 28 and 29 are rotated by the rotational force of the spline shaft 13. That is what we are doing. To explain more specifically, a timing pulley 31 fitted on the spline shaft 13 is provided, and timing pulleys 32 and 33 are connected to the pair of rollers 28 and 29, respectively. Further, a tension pulley 34 is provided on the vibrating frame 24, and the fixed frame 24 is provided with a tension pulley 34.
5 is provided with a guide pulley 39, and a timing belt 35 is hung around the timing pulleys 31, 32, 33, tension pulley 34, and guide pulley 39.

As shown in FIG. 1, a spline shaft 13 for transmitting driving force is arranged between the mounts 2 and 3. As shown in FIG. The right side of the tin line shaft 13 is rotatably supported by a bearing 36 provided on the fixed frame 5 of the pedestal 2, and the above-mentioned timing pulley 19 is fixed to the right end thereof.

On the other hand, a spline 37 is formed on the left side of the spline shaft 13. Then, the timing pulley 3 mentioned above
1 has a boss that fits into this spline 37. A part of the timing pulley 31 is connected to the frame 3 via a bearing 38.
It is held by a fixed frame 25. Therefore, the timing pulley 31 moves along the spline shaft 13 along the spline 37.
can be moved in the axial direction.

The length of the spline 37 formed on the spline shaft 13 is
The length may be set as necessary depending on the amount by which the distance between the mounts 2 and 3 is changed. That is, as shown in this embodiment, the spline 37 may be formed on a part of the spline shaft 13, or the spline 37 may be formed over almost the entire length of the spline shaft 13.

Further, in this embodiment, the tin line shaft 13 is used, but a eraser shaft having a key groove having the same function as the spline shaft 13 may also be used.

Furthermore, in this embodiment, the right part of the spline shaft 13 is rotatably supported by a bearing 36 provided on the fixed frame 5 of the pedestal 2, and the spline axle load 3 is applied to the left and right sides of the pedestal 2. Although it has a structure that does not move, instead of this, an engagement similar to the engagement between the pedestal 3 and the spline shaft 13 is adopted, and the spline shaft 13 is moved in the left and right direction with respect to the pedestal 2. In other words, a spline may also be formed on the right side of the spline shaft 13, the timing pulley 19 may be attached via this spline, and a part of the timing pulley 19 may be mounted on a mount via a bearing. It may be configured such that the second fixed frame 5 holds it.

Furthermore, in this embodiment, the spline shaft 13 is engaged with the timing pulley 19 and the timing pulley 31, but instead of this, the spline shaft 13 is engaged with the timing pulleys 17 and 32.
, timing pulleys 18 and 33, guide pulleys 15 and 39
, or may be engaged with tension pulleys 16 and 34.

A feed screw shaft 40 is further arranged on the bed 1. The feed screw shaft 40 is rotatably supported on both sides by bearings 41 and 42 protruding from the bed 1, and a motor 43 for rotating the feed screw shaft 40 is connected to the left end thereof. The feed screw shaft 40 is provided with a right-handed thread forming part 44 having a right-hand thread on the right side with respect to the center thereof, and a left-hand thread forming part 45 having a left-hand thread on the left side. The right thread forming part 44 is pushed through a threaded bearing 46 fixed to the fixed frame 5 of the pedestal 2, and the left thread forming part 45 is inserted into a threaded bearing 47 fixed to the fixed frame 25 of the mount 3. . Therefore, by rotating the feed screw shaft 40 in the same direction by the motor 43, the pedestal 2 is guided to the right-hand thread forming part 44, and the pedestal 3 is guided to the left-hand thread forming part 44.
5 and are moved in a direction toward each other. Further, by rotating the feed screw shaft 40 in the opposite direction by the motor 43, the mount 2 and the mount 3 are moved in a direction away from each other.

In this embodiment, the feed screw shaft 40 is rotated by the motor 43, but instead of the motor 43, a handle is attached to one end of the feed screw shaft 40, and the feed screw shaft 40 is manually rotated. Good too. In addition, motor 4
3 may be an electric motor, a hydraulic motor, or a pneumatic motor.

Furthermore, in this embodiment, since both the pedestal 2 and the pedestal 3 are movable with respect to the bed 1, the feed screw shaft 40 is moved to the right-hand thread forming portion 44 and the left-hand thread forming portion 45 as described above.
However, if only one of the mounts 2 and 3 is movable relative to the bed 1, and the other is fixed relative to the bed 1, the feed screw shaft 40 The shaft may have a right-handed thread or a left-handed thread only for the movable frame.

Since this embodiment is configured as described above, by rotating the motor 43, the interval between the mounts 2 and 3 can be easily adjusted to a desired interval. After the mounts 2 and 3 are spaced at a desired distance, the test object 10 is placed on the rollers 8 and 9 of the mount 2 and the rollers 28 and 29 of the mount 3, and a dynamic balance test of the test object 10 is performed. . At this time, since the rollers 8 and 9 of the pedestal 2 and the rollers 28 and 29 of the pedestal 3 are connected via the spline shaft 13, they are rotated at mutually synchronized speeds. Therefore, the unbalance of the test object 10 can be accurately measured.

Note that the shaft diameter of the test object varies depending on the location, and roller 8
, 9 and the shaft diameter of the test object at the portion supported by rollers 28, 2.
The shaft diameter of the portion supported by 9 may be different from the shaft diameter of the test object. In such a case, the diameter of the roller 89 and the roller 28.29
The diameters of the rollers 8,
It is necessary to change the rotational speed of roller 9 and the rotational speed of rollers 28 and 29. In that case, roller 8.9 or roller 2
The number of teeth of the timing pulleys 17, 18 or 32, 33 connected to the timing pulleys 8.29 and 32.33 may be changed.

Further, the motor 12 and the spline shaft 13 are connected to the frame 2.
, 3, unnecessary vibrations are not transmitted to the vibrating frames 4, 24 of each mount 2.3.

Furthermore, since the spline shaft 13 and the feed screw shaft 40 are arranged above the bed 1, maintenance of the spline shaft 13, the feed screw shaft 40, and the surrounding bearings is easy after installation at the site. There is also the advantage of being

FIG. 4 is a front view of a dynamic balance tester according to another embodiment of the present invention, and FIG. 5 is a right side view thereof. A feature of the embodiment shown in FIGS. 4 and 5 is that the two frames 2 provided on the bed 1 are symmetrical and of equal construction, and each is provided with its own motor 12.
rollers 8 and 9 provided on each frame 2 by 2;
is rotated. As a result of this configuration, the motor 12 attached to the pedestal 2
It is no longer necessary to transmit the rotational force of the
The spline shaft 13, which was necessary in the illustrated embodiment, is omitted. The rest of the structure is the same as that of the frame 2 of the embodiment described in FIGS. 1 and 2, and corresponding parts are given the same numbers and will not be described here.

Note that the motors 12 of the two mounts 2 are normally rotated synchronously at the same speed, but if it is necessary to rotate them at different speeds in relation to the shaft diameter of the test object, the speed of each motor 12 may be changed to match that. All you have to do is control.

Also in this embodiment, the two mounts 2 are not movable relative to the bed 1, and only one of the mounts 2 is moved relative to the bed 1.
It may also be configured to be movable.

In the above embodiment, two mounts 2゜3 are provided on the bed 1, but there may be three or more mounts.Especially when the test object is long in the axial direction or when the test object is If the body is heavy, three or more mounts are provided. Even in that case, the rollers of each mount can be rotated based on the configuration of the present invention. Furthermore, it is not necessary that all the frames are movable with respect to the bed 1, and only any one of the three or more frames may be used as necessary. When making any frame movable, one set of feed screw shaft for moving the frame and a motor for rotating the screw shaft may be sufficient, or two or more sets of feed screw shafts and motors may be required. Maybe. In any case, it may be constructed based on the idea of the present invention.

Further, the motor for rotating the feed screw shaft may be replaced with a normal electric motor and may be a pneumatic motor or a hydraulic motor.

Furthermore, instead of the feed screw shaft, a longitudinal member that is slid by an air cylinder may be used to make any frame movable.

In addition, each mount was provided with a pair of rollers, and both rollers were rotated by a timing belt, but only one of the pair of rollers was rotated by a timing belt. While the roller is being rotated, the other roller may be in a freely rotatable state.

Furthermore, it should be noted that these embodiments can be applied to both a so-called soft-type dynamic balance tester and a so-called hard-type dynamic balance tester.

<Effects of the Invention> Since the present invention is configured as described above, it provides a dynamic balance tester that can adjust the frame spacing with a simple structure and can perform dynamic balance tests on a wide variety of test objects. can do.

Furthermore, since the structure is simple, maintenance is easy.

Of course, the measurement accuracy as a dynamic balance tester is not impaired, and the amount of unbalance of the test object can be accurately detected.

[Brief explanation of the drawing]

FIG. 1 is a front view of a dynamic balance tester according to an embodiment of the present invention. FIG. 2 is a right side view of the dynamic balance tester shown in FIG. 1. FIG. 3 is a left side view of the dynamic balance test machine shown in FIG. 1, and is a simplified diagram in which parts other than those necessary for explanation are omitted. FIG. 4 is a front view of a dynamic balance tester according to another embodiment of the present invention. FIG. 5 is a right side view of the dynamic balance tester shown in FIG. 4. In the figure, 1... Bed, 2.3... Frame, 4°24... Vibration frame, 5, 25... Fixed frame, 6, 7, 2
6゜27...plate spring, 8,9.28.29...
・Roller, 10...Test object, 12...Motor, 1
3... Tin line shaft, 14... Drive pulley, 16.
34...Tension 1-ri, 17.18, 19, 31
,32゜33...timing pulley, 20.35...
・Timing belt, 23.30...Pickup,
40... Indicates the feed screw shaft. Patent Applicant Nagahama Seisakusho Co., Ltd. Agent Patent Attorney Kou Inaoka

Claims (3)

[Claims] (1) It includes a bed, two or more plurality of frames erected on the bed, and a rotating shaft pivotally supported by the plurality of frames, and at least one of the plurality of frames includes the The plurality of frames are movable with respect to the bed, and each of the plurality of frames includes a roller for supporting a test object and rotating the test object, and a roller for detecting an imbalance between the test object. Any one of the plurality of frames is provided with a drive source and a detection means for transmitting the driving force of the drive source to the roller provided on the frame. A first transmission mechanism and a second transmission mechanism for transmitting the driving force of the drive source to the pivotally supported rotating shaft are provided, and among the plurality of frames, the drive source, etc. is provided. Each of the mounts other than one of the mounts is provided with a third transmission mechanism for transmitting the rotational force of the rotary shaft supported to the roller provided on the mount, and the rotation A spline or a keyway is formed in the shaft, and at least one of the second transmission mechanism and the third transmission mechanism is movable in the axial direction of the rotating shaft along the spline or the keyway. A dynamic balance testing machine characterized by: (2) The bed includes a bed and two or more mounts erected on the bed, at least one of the mounts is movable with respect to the bed, and the plurality of mounts are movable with respect to the bed. Each of the frames includes a roller for supporting a test object and rotating the test object, a detection means for detecting an unbalance of the test object, a drive source, and the drive source. A dynamic balance testing machine comprising: a transmission mechanism for transmitting the driving force of the above to the roller provided on the mount. (3) In the dynamic balance tester according to claim 1 or 2, a longitudinal member for adjusting the spacing between the frames is provided on the bed, and the longitudinal member is connected to the plurality of frames. By rotating the longitudinal member, which is screwed to at least one of the plurality of frames, the coupling position between the longitudinal member and the at least one frame which is threadedly coupled to the longitudinal member changes. A dynamic balance tester characterized in that it can be moved.