JPH04221731A - Reference position detecting device for rotary body for balance tester - Google Patents

Abstract

PURPOSE:To prevent the occurrence of malfunction of a sensor even when the temperature of a rotary body is high by providing a detecting sensor for detecting the unbalancing phase reference position of the rotary body of a balance tester with a cooling device. CONSTITUTION:By blowing air for cooling against the sensor head of a phase reference position detecting sensor 16 or installing the sensor head in air flow and the like for cooling, the detecting sensor 16 is prevented from malfunction owing to heat generated by a rotary body R even when the temperature of the rotary body R is high.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] This invention relates to a reference position detection device for a rotating body which is normally provided in a balance testing machine, and is particularly suitable for a testing machine for measuring the unbalance of a high-temperature rotating body. The present invention relates to a reference position detection device for a rotating body.

0002

2. Description of the Related Art Taking a motor armature as an example, it may be heated to about 120 degrees Celsius due to the manufacturing process. Therefore, when the heated motor armature is set in the balance tester, it has not yet been completely cooled down and may be at a high temperature of approximately 80 to 100 degrees Celsius.

[0003] Even if an attempt is made to immediately measure the unbalance of such a high-temperature motor armature, accurate measurement cannot be performed. This is because the reference position detection sensor, so-called proximity sensor, for detecting the unbalance phase reference position of the rotating body required for unbalance measurement has a standard operating temperature range of -10 degrees Celsius to +55 degrees Celsius. This is because it is a degree. Therefore, when the rotating body is at a high temperature, the proximity sensor is placed in a state where the ambient temperature is 60 degrees Celsius or higher due to the heat generated by the rotating body, and does not operate normally.

0004

[Problem to be Solved by the Invention] Conventionally, there has been no method or device to proactively solve this problem, and the method has been to wait for the rotating body to cool down naturally, so that the temperature of the rotating body falls within the operating temperature range of the proximity sensor. After that, the rotating body was placed in a balance tester and its unbalance was measured. For this reason, conventionally, it was necessary to secure a place and structure to naturally cool the high-temperature rotating body under test, such as a motor armature.
This has the disadvantage of being undesirable in terms of space and economy. Further, in the case of a system in which the balance tester is systematized and can consistently measure unbalance and correct it, there is a drawback that the cycle time for the system to process the rotating body is long.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a reference position detection device that can operate accurately even when a rotating body is at a high temperature, which has not been provided heretofore.

[0006]

[Means for Solving the Problems] The present invention relates to a reference position detection device for a rotating body for a balance testing machine, and is provided at a position close to the rotating body when the rotating body for measuring unbalance is set. The apparatus is characterized in that it includes a reference position detection sensor for detecting an unbalanced phase reference position of a rotating body, and a sensor cooling means for cooling the reference position detection sensor with cooling gas.

[0007]

[Operation] The reference position detection sensor is cooled with cooling gas by the sensor cooling means. Specifically, for example, cooling gas is blown onto the reference position detection sensor, or the reference position detection sensor is disposed within a passage through which the cooling gas passes. Therefore, even if the temperature of the rotating body to be measured is high, the heat generated by the rotating body has little effect on the reference position detection sensor, and the reference position detection sensor is operated within its operating temperature range.

[0008]

[Embodiments] Hereinafter, embodiments of the present invention will be explained in detail. FIG. 2 is a front view showing an example of a balance testing machine equipped with a reference position detection device according to an embodiment of the present invention, and FIG. 3 is a sectional view taken along line A-A in FIG. The balance tester 1 is equipped with two bearing stands 5 and 6 held by a spring 3 installed upright on a bed 2, and these bearing stands 5 and 6 support a rotating body, such as a motor armature R, whose imbalance is to be measured. The rotating shafts at both ends are held. A pair of support arms 7a and 7b are provided on the bed 2, and pulleys 8 and 9 are rotatably held by the support arms 7a and 7b, respectively. Furthermore, a motor 10 is attached to the lower side of the bed 2,
A motor pulley 11 is provided on the rotating shaft of the motor 10. A drive belt 15 is wound around the three pulleys 8, 9 and 11 mentioned above. And motor 1
When the drive belt 15 is moved by 0, the rotating body R is rotated at a predetermined unbalance measurement speed.

Further, as mentioned above, the rotating body R is mounted on the bearing stand 5,
A reference position detection device 100 is provided at a position close to and facing the lower outer circumferential surface of the rotating body R when the reference position detection device 100 is set to 6. A feature of this embodiment is that the reference position detection device 100 is configured to include a cooling device as described below. FIG. 1 is an illustrative diagram showing the configuration of a reference position detection device 100 according to this embodiment. In FIG. 1, R is the lower part of the rotating body for measuring the unbalance mentioned above. The reference position detection device 100 is equipped with a proximity sensor 16 for detecting an unbalanced phase reference position. This proximity sensor 16 is provided at a position where its sensor surface (upper end surface in the figure) is close to and faces the circumferential surface of the rotating body R. The proximity sensor 16 is mounted within a storage case 17 made of a material with low thermal conductivity. The proximity sensor 16 is installed in a storage chamber 18 formed in the storage case 17. The upper end of the storage chamber 18 is open, and a cooling air supply hole 19 is communicated with the lower portion of the storage chamber 18 . A cooling air supply device 21 is attached to the cooling air supply hole 19 via an air supply pipe 20. Therefore, the cooling air generated by the cooling air supply device 21 enters into the storage chamber 18 from the lower side of the storage chamber 18 via the supply pipe 20 and the supply hole 19, and flows out from the upper end opening of the storage chamber 18. do. Therefore, the proximity sensor 16 is placed within the cooling air flow path. Therefore, even if the rotating body R is at a high temperature of nearly 100 degrees Celsius, the proximity sensor 16 placed in the cooling air is not easily affected by the heat generated by the rotating body R and operates normally.

Therefore, it is not necessary to naturally cool the rotating body R until the temperature drops below a predetermined temperature as in the conventional case.
The unbalance measurement can be performed while the rotating body R remains at a high temperature. Therefore, the cycle time of processing in the unbalance measurement and correction system can be shortened, and additional equipment and additional space of the balance tester can be reduced.

FIG. 4 is a diagram showing a modification of the mounting portion of the proximity sensor 16, and is a plan view of the storage case 17 viewed from above. As shown in FIG. 4, radiation fins 22 that spread radially may be attached to the proximity sensor 16. Heat dissipation fin 2
2 is made of a material with good thermal conductivity, such as copper or aluminum. The radiation fin 22 is connected to the proximity sensor 1
The proximity sensor 16 may be formed integrally with the exterior body 6, or the proximity sensor 16 may be housed in a separately formed heat dissipation fin 22.

FIG. 5 is a diagram showing another example of the storage case 17 for the proximity sensor 16, in which (a) is a plan view and (b) is a longitudinal sectional view. As shown in FIG. 5, various air holes 23 are formed around the storage chamber 18 that houses the proximity sensor 16, and cooling air is supplied to the proximity sensor 16 in the storage chamber 18 from above and below. You can do it like this. FIG. 6 shows a proximity sensor 16 according to still another embodiment of the present invention.
FIG.
b) is a longitudinal sectional view. As shown in FIG. 6, the storage chamber 18
For example, a cylindrical sintered metal ring 24 may be arranged around the sintered metal ring 24, and cooling air may be sent into the storage chamber 18 via this sintered metal ring 24. Sintered metal is usually made of small metal particles that have been sintered and hardened, and has a large number of passage holes. Therefore, when cooling air is sent into the storage chamber 18 through the sintered metal ring 24, the cooling air is supplied to the proximity sensor 16 from various sources. Therefore, the proximity sensor 16 is evenly exposed to the cooling air and cooled.

FIG. 7 is an illustrative diagram showing the configuration of a reference position detection device 101 according to yet another embodiment of the present invention. In the embodiment of FIG. 7, the proximity sensor 16 is not placed in the storage chamber 18 and provided with cooling air as in the previous embodiments, but the sensor head (upper end surface in the figure) of the proximity sensor 16 is provided with cooling air. The structure is such that cooling air is blown directly. More specifically, the cooling air generated by the cooling air supply device 21 is supplied to the jet nozzle 25 via the air supply pipe 20, and the cooling air is supplied to the jet nozzle 25 through the air supply pipe 20.
5 toward the sensor head of the proximity sensor 16. Therefore, since cooling air is directly blown onto the sensor head of the proximity sensor 16, even if the rotating body R is at a high temperature, the heat generated by the rotating body R will not have a negative effect on the sensor head of the proximity sensor 16. do not have.

In the embodiment of FIG. 7 as well, the proximity sensor 16 may be provided with radiation fins 22, as shown in FIG. Further, in the embodiment shown in FIG. 7, the proximity sensor 16 is not housed in a housing member made of a material with low thermal conductivity, but on the contrary, the proximity sensor 16 is housed in a mounting bracket made of a metal with high thermal conductivity.
It is preferable that it be installed. The present invention can be applied to various types of balance test machines other than the balance test machines explained with reference to FIGS. 2 and 3, and is not limited to the balance test machine like this embodiment. do not have. It should be noted that various other design changes can be made without changing the gist of the invention.

[0015]

[Effects of the Invention] Since the present invention is constructed as described above, even if the rotating body whose unbalance is to be measured is at a high temperature, the unbalance reference position can be accurately detected even if the rotating body is at a high temperature. Balance measurements can be made quickly. Also,
In the balance testing machine and unbalance detection and correction system to which the present invention is applied, the space of the device can be reduced, and the cycle time for processing a rotating body can be shortened.

[Brief explanation of the drawing]

FIG. 1 is an illustrative diagram showing the configuration of a reference position detection device according to an embodiment of the present invention.

FIG. 2 is a front view showing an example of the configuration of a balance tester to which an embodiment of the present invention is applied.

FIG. 3 is a sectional view taken along line A-A in FIG. 2;

FIG. 4 is a diagram showing another example of the configuration of the proximity sensor in the embodiment of the present invention.

FIG. 5 is a diagram showing the configuration of a reference position detection sensor storage case according to another embodiment of the present invention.

FIG. 6 is a diagram showing the configuration of a storage case for a reference position detection sensor according to another embodiment of the present invention.

FIG. 7 is an illustrative diagram showing the configuration of a reference position detection device according to still another embodiment of the present invention.

[Explanation of symbols]

1 Balance tester 16 Proximity sensor (phase reference position detection sensor) 17
Proximity sensor storage container 18 Storage chamber 21 Cooling air supply device 25 Cooling air jet nozzle 100 Reference position detection device 101 Reference position detection device

Claims (1)

[Claims] Claim 1: Provided at a position close to the rotating body when the rotating body for measuring unbalance is set,
A rotating body for a balance testing machine, comprising a reference position detection sensor for detecting an unbalanced phase reference position of the rotating body, and a sensor cooling means for cooling the reference position detection sensor with cooling gas. Reference position detection device.