Vibration force measuring device

Abstract

The present invention discloses a vibration force measuring device, which comprises a measuring platform, a lifting device, a sensor, a vibration transmission member, and an elastic support member. The measuring platform has a bearing surface for bearing an object to be measured. The lifting device is configured to lift the measuring platform away from the upper surface of the lifting device. The sensor is configured to sense the vibration amount generated when the object to be measured is in operation. The vibration transmission member has a first end and a second end opposite to each other. The first end is engaged with the sensor, and the second end is configured to receive the vibration amount. The elastic support member connects the measuring platform and the supporting structure, wherein the vibration transmission member and the elastic support member are respectively located on two opposite sides of the measuring platform. By respectively arranging the sensor, the vibration transmission member, and the elastic support member on two opposite sides of the object to be measured, the vibration force of the object to be measured during operation can be sensed instantly, and the vibration force data can be quantified and graded, so as to have the ability of rapid full inspection.

Description

Technical Field

[0001] The present invention relates to a force measuring device, and in particular to a vibration force measuring device. Background Art

[0002] Rotating machinery is widely used in electromechanical systems in various fields. In order to solve the problem of unbalanced vibration generated by rotating machinery during operation, the industry's known technology often uses a dynamic balancing machine to measure the unbalanced mass and location, and adopts a subtraction or addition correction method to solve the rotor unbalanced vibration problem.

[0003] Dynamic balancing machines can be divided into soft balancing machines and hard balancing machines in principle. Soft balancing machines are relatively rare in the market because they are complicated to operate. Hard balancing machines use piezoelectric force sensors to directly process the signal of the vibration force. For double-sided and single-sided dynamic balancing, hard balancing machines can provide a faster balancing method compared to the complex plane separation calculation of soft balancing machines.

[0004] The balancing machine mainly measures the rotor imbalance through the centrifugal force generated when the rotor rotates. The hard bearing balancing machine can directly measure the centrifugal force and then use the centrifugal force to calculate the rotor imbalance. The soft bearing balancing machine measures the vibration of the rotor when it rotates, so a test weight must be added to convert it into the rotor imbalance.

[0005] Hard support balancing machines are more suitable for rotors with large mass and large initial imbalance. Soft support balancing machines are more suitable for lighter rotors and rotors with very high operating speeds. Since lighter rotors and rotors with high speeds are widely used in various small household appliances, they are in great demand in the market.

[0006] However, for various small cooling fans used in the fields of electronics, automobiles, medical treatment, and home appliances, the hard-support balancing machine has too large an accuracy error for tiny vibration forces, and for high-speed rotors, the natural frequency may be too close to or lower than the natural frequency, and thus cannot be measured. The soft-support balancing machine developed for fans uses an accelerometer to measure vibration, which cannot meet the needs of the production line to directly detect centrifugal force. At the same time, there are errors in the conversion of the detected vibration into centrifugal force. In addition, the existing soft-support balancing machine specifications have poor measurement sensitivity and resolution for tiny vibration forces, and cannot accurately and directly present the small fan vibration force data required by the production line, and therefore cannot be further applied to product grading.

[0007] The biggest problem with existing fan vibration measurement systems for quality control on manufacturers' production lines is that the installation and measurement time is too long, and the amount of detection per unit time cannot exceed that of manual labor. Summary of the invention

[0008] Therefore, one purpose of the present invention is to provide a vibration force measuring device, which has sensors, vibration transmission parts, and elastic support parts respectively arranged on two opposite sides of the object to be measured, so as to instantly sense the vibration force of the object to be measured during operation, and to quantify and grade the vibration force data, thereby having the ability of rapid full inspection, and can solve the problem that commercial rotor vibration detection systems cannot conduct full inspection in product production lines with high-speed rotating components such as fans.

[0009] Another object of the present invention is to provide a vibration force measurement device that is easy to set up and install, thereby solving the problem of long measurement time in commercial rotor vibration detection systems in product production lines with high-speed rotating elements such as fans.

[0010] Another object of the present invention is to provide a vibration force measurement device, which can use a load cell sensor as a vibration sensor, so that the force change data of the object to be measured during operation can be directly measured, and it has the advantages of low cost, easy acquisition, and complete specifications, especially for the measurement range of micro-vibration forces below 10N.

[0011] Another object of the present invention is to provide a vibration force measurement device, whose measurement platform can be supported by a lifting device with no friction or low friction, thereby preventing friction interference and effectively improving the sensitivity of vibration force measurement of the object to be measured.

[0012] According to the above-mentioned purpose of the present invention, a vibration force measuring device is provided, which is suitable for measuring an object to be measured having a high-speed rotating element. This vibration force measuring device comprises a measuring platform, a lifting device, a sensor, a vibration transmission member, and an elastic support member. The measuring platform has a bearing surface for bearing the object to be measured. The lifting device is configured to lift the measuring platform off the upper surface of the lifting device. The sensor is configured to sense the vibration amount generated when the object to be measured is in operation. The vibration transmission member has a first end and a second end opposite to each other, wherein the first end is engaged with the sensor, and the second end is configured to receive the vibration amount. The elastic support member connects the measuring platform and the supporting structure, wherein the vibration transmission member and the elastic support member are respectively located on two opposite sides of the measuring platform.

[0013] According to an embodiment of the present invention, the measuring platform includes a fixture configured to fix the object to be measured on the measuring platform. The fixture includes a first clamping portion and a second clamping portion opposite to each other.

[0014] According to an embodiment of the present invention, the lifting device is an air bearing, which can use gas to float the measuring platform.

[0015] According to an embodiment of the present invention, the lifting device comprises at least three balls protruding from an upper surface of the lifting device, and the balls are configured to lift the measuring platform away from the upper surface of the lifting device.

[0016] According to an embodiment of the present invention, the lifting device further comprises at least one magnetic attraction element, and the magnetic attraction element is configured to exert a magnetic attraction force on the measuring platform.

[0017] According to an embodiment of the present invention, the second end of the vibration transmission element is further configured to abut against the object to be measured or the measuring platform.

[0018] According to an embodiment of the present invention, the sensor is coupled to the support structure, and the natural frequency of the system composed of the support structure, the sensor, and the elastic support member is lower than the rotation frequency of the object to be measured.

[0019] According to an embodiment of the present invention, the natural frequency of the elastic support member is less than half of the rotation frequency of the object to be measured.

[0020] According to an embodiment of the present invention, the vibration transmission element includes a ejector pin.

[0021] According to an embodiment of the present invention, the elastic supporting member includes a spring.

[0022] Compared with the prior art, the vibration force measuring device of the present invention has the following beneficial effects:

[0023] Sensors, vibration transmission parts, and elastic support parts are respectively set on the two opposite sides of the object to be tested, so that the vibration force of the object to be tested can be instantly sensed during operation, and the vibration force data can be quantified and graded. Therefore, the vibration force measurement device has the ability to quickly conduct a full inspection, which can solve the problem that commercial rotor vibration detection systems cannot conduct a full inspection in the production line of products with high-speed rotating components such as fans.

[0024] It is easy to set up and install, so it can solve the problem of long measurement time in commercial rotor vibration detection systems in product production lines with high-speed rotating components such as fans.

[0025] The measuring platform can use load cell sensors as vibration sensors, so it can directly measure the force change data of the object under test during operation, and has the advantages of low cost, easy acquisition, and complete specifications.

[0026] The measuring platform can be supported by a frictionless or low-friction lifting device, thereby preventing friction interference and effectively improving the sensitivity of the vibration force measurement of the object to be measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to make the above and other objects, features, advantages and embodiments of the present invention more clearly understood, the accompanying drawings are described as follows:

[0028] Figure 1 is a schematic side view of a vibration force measuring device according to an embodiment of the present invention; and

[0029] Figure 2 FIG. 4 is a side view schematic diagram of a vibration force measuring device according to another embodiment of the present invention.

[0030] Description of main reference numerals:

[0031] 100a-vibration force measuring device, 100b-vibration force measuring device, 110-measuring platform, 112-bearing surface, 114-clamping fixture, 114a-first clamping part, 114b-second clamping part, 116-first side, 118-second side, 120-lifting device, 122-upper surface, 124-base, 126-floating part, 130-sensor, 140-vibration transmission member, 142-first end, 144-second end, 150-elastic support member, 152-first end, 154-second end, 160-object to be measured, 170-supporting structure, 180-lifting device, 182-base, 184-ball, 186-magnetic element, 188-upper surface, X-coordinate axis, Y-coordinate axis, Z-coordinate axis. DETAILED DESCRIPTION

[0032] The hard support dynamic balancing technology is suitable for measuring rotors with vibrations less than the natural frequency of the system, and is therefore more suitable for larger rotor workpieces to directly measure centrifugal force. The soft support dynamic balancing technology is suitable for measuring rotors with vibrations greater than the natural frequency of the system, and is therefore more suitable for small and high-speed rotor workpieces to measure vibration displacement. The present invention proposes a vibration force measurement device, which is suitable for the vibration frequency of the object to be measured being higher than the natural frequency of the support system of the measurement device.

[0033] Please refer to Figure 1 , which is a side view schematic diagram of a vibration force measuring device according to one embodiment of the present invention. The vibration force measuring device 100a can be used to measure the force, such as vibration force, generated when the object to be measured 160 with a high-speed rotating element is in operation. In some examples, the object to be measured 160 can be a motor or a fan, such as a thin cooling fan or a thin motor. The rotation radius of the object to be measured 160 can be, for example, more than 3 times the axial thickness of the object to be measured 160. Generally speaking, the centrifugal force of a thin fan is greater than the centrifugal force of a non-thin fan. Therefore, the shaking force of a thin fan when it is in operation is mainly the radial centrifugal force generated by the offset of the fan's center of mass when it rotates. The vibration force measuring device 100a can mainly include a measuring platform 110, a lifting device 120, a sensor 130, a vibration transmission member 140, and an elastic support member 150.

[0034] The measuring platform 110 has a carrying surface 112. The object to be measured 160 can be placed on the carrying surface 112 and carried by the measuring platform 110. The carrying surface 112 can extend horizontally, for example. In some exemplary embodiments, the horizontal plane is an XY plane defined by a coordinate axis X and a coordinate axis Y, and the carrying surface 112 is substantially parallel to the XY plane during measurement. The coordinate axis Z is perpendicular to the XY plane, and the coordinate axis X, the coordinate axis Y, and the coordinate axis Z are perpendicular to each other. The measuring platform 110 can be made of a lightweight plate to reduce the influence of the vibration signal generated by the object to be measured 160 during operation.

[0035] In some examples, the measuring platform 110 may include a fixture 114. The fixture 114 may be convexly disposed on the bearing surface 112 of the measuring platform 110. The fixture 114 may clamp and fix the object to be measured 160 on the bearing surface 112 of the measuring platform 110. The measuring platform 110 may have a first side 116 and a second side 118 opposite to each other. In some exemplary examples, the fixture 114 includes a first clamping portion 114a and a second clamping portion 114b. The first clamping portion 114a and the second clamping portion 114b are respectively disposed on the first side 116 and the second side 118 of the measuring platform 110, and the first clamping portion 114a and the second clamping portion 114b are opposite to each other. The first clamping portion 114a and the second clamping portion 114b may both be, for example, L-shaped structures to support and clamp the object to be measured 160. The fixture 114 is not limited to the above examples, and the structure of the fixture 114 can be adjusted according to the appearance of the object to be tested 160 and the measurement requirements. The measurement platform 110 can also use other fixing elements, such as clamping parts, locking parts, magnetic parts, or vacuum adsorption parts, to clamp and fix the object to be tested 160 on the carrying surface 112 of the measurement platform 110.

[0036] The measuring platform 110 is disposed above the upper surface 122 of the lifting device 120. The lifting device 120 can lift the measuring platform 110 away from the upper surface 122 of the lifting device 120, thereby greatly reducing the friction between the measuring platform 110 and the lifting device 120. Since the upper surface 122 of the lifting device 120 is an XY plane, by reducing the friction between the measuring platform 110 and the lifting device 120, the interference of the friction on the vibration force signal of the object to be measured 160 in the XY plane can be avoided.

[0037] In this embodiment, the lifting device 120 is an air bearing. In some examples, the lifting device 120 may include a base 124 and at least one air bearing 124, such as two air bearings 124. Figure 1As shown. The air flotation portion 126 may be protruding from the base 124. For example, the air flotation portion 126 may be embedded in the base 124, and the top surface of the air flotation portion 126 is higher than the top surface of the base 124. In other examples, the top surface of the air flotation portion 126 may be flush with the top surface of the base 124, or may be lower than the top surface of the base 124. The air flotation portion 126 of the lifting device 120 may use gas to float the measurement platform 110 so that the measurement platform 110 is separated from the upper surface 122 of the lifting device 120.

[0038] The sensor 130 can be mainly used to sense the vibration amount generated when the object to be tested 160 is running. Figure 1 As shown, the sensor 130 can be indirectly coupled to the measuring platform 110. For example, the sensor 130 can be fixedly coupled to the support structure 170. The support structure 170 can be an external structure, or can be the base 124 of the lifting device 120 or an extension structure of the base 124. The sensor 130 can be, for example, a load cell sensor, a piezoelectric force sensor, or a capacitive force sensor. The sensor 130 can also be a displacement sensor, an acceleration sensor, etc., such as a linear differential transformer (LVDT), a capacitive displacement device, an optical ruler, a magnetic ruler, and an accelerometer. As long as the sensor can measure physical quantities such as force, displacement, or acceleration generated by vibration, it is within the scope of implementation of the sensor of the present invention. In some exemplary examples, the sensor 130 can be a load cell sensor. The load cell sensor can directly measure the force change data, especially for the measurement range of micro-vibration forces below 10N, and has the advantages of low cost, easy availability, and complete specifications.

[0039] The vibration transmission member 140 has a first end 142 and a second end 144 opposite to each other. In some examples, the vibration transmission member 140 may be a rod-shaped structure. For example, the vibration transmission member 140 may include a pin. The first end 142 of the vibration transmission member 140 is engaged with the sensor 130. The second end 144 of the vibration transmission member 140 is configured to receive the vibration amount generated when the object to be measured 160 is in operation. For example, the second end 144 of the vibration transmission member 140 may abut against a side of the object to be measured 160 or the first side 116 of the measuring platform 110. In some exemplary examples, the second end 144 of the vibration transmission member 140 abuts against the first clamping portion 144 located on the first side 116 of the measuring platform 110. Thereby, the change in the vibration amount of the measuring platform 110 caused by the operation of the object to be measured 160 can be transmitted to the sensor 130 via the vibration transmission member 140. For example, the vibration transmission element 140 can transmit the vibration generated when the object to be measured 160 runs on the measurement platform 110 to the sensor 130 .

[0040] The elastic support member 150 and the vibration transmission member 140 are respectively located on two opposite sides of the measuring platform 110. The elastic support member 150 can directly connect the object to be measured 160 and the support structure 170, or can connect one side of the measuring platform 110 and the support structure 170. In some exemplary embodiments, such as Figure 1 As shown, the elastic support member 150 may have a first end 152 and a second end 154 opposite to each other. The first end 152 of the elastic support member 150 is engaged with the second clamping portion 114b of the fixture 114, and the second end 154 is engaged with the support structure 170. The elastic support member 150 may include a spring, for example. The compressive force and the tensile force applied to the elastic support member 150 may respectively cause the elastic support member 150 to perform elastic movements of compression and tension between the second side 118 of the measuring platform 110 and the support structure 170.

[0041] In some examples, since the sensor 130 and the elastic support member 150 are both connected to the support structure 170, the natural frequency of the system composed of the support structure 170, the sensor 130, and the elastic support member 150 is designed to be lower than the rotation frequency of the object to be measured 160. The elastic support member 150 can use elastic elements with different natural frequencies according to the rotation frequency of the object to be measured 160 to be measured. In some exemplary examples, the natural frequency of the elastic support member 150 is less than half of the rotation frequency of the object to be measured 160.

[0042] Since the rotor type of most heat dissipating objects 160 is that the rotation diameter is 3 to 10 times greater than the axial size, the unbalance of the rotor of the object 160 during operation can be regarded as a single plane vibration, the main part of which is radial vibration. Therefore, this embodiment is simplified to only measure the radial vibration force of the object 160 on the XY plane.

[0043] Since the vibration transmission member 140 and the elastic support member 150 are respectively located at two opposite sides of the object to be measured 160 in the horizontal direction, for example, they are respectively connected to the first side 116 and the second side 118 of the measuring platform 110, and the elastic support member 150 can be compressed and stretched between the second side 118 of the measuring platform 110 and the supporting structure 170. Therefore, the radial vibration generated by the operation of the object to be measured 160 can make the measuring platform 110 reciprocate between the vibration transmission member 140 and the elastic support member 150, so that the first clamping portion 114a intermittently impacts the vibration transmission member 140. The vibration transmission member 140 can transmit these impact amounts to the sensor 130, whereby the sensor 130 can sense the vibration force generated by the operation of the object to be measured 160.

[0044] In the exemplary embodiment, the vibration force measuring device 100a uses a load cell sensor as the sensor 130. Since the load cell sensor can directly measure the force change data of the object to be tested 160 when it is running, the vibration force measuring device 100a has the capabilities of real-time force sensing, data quantification and grading, and rapid full inspection. For example, the upper and lower boundary values ​​of the vibration force of the object to be tested 160 can be set, so that the quality of the object to be tested 160 can be quickly detected according to the measurement data. In addition, the vibration sensing force can be graded, so that the product quality of the object to be tested 160 can be quickly graded according to the measurement data.

[0045] In addition, the load cell sensor is low in price, which can reduce the equipment cost of the vibration force measuring device 100a. Moreover, since the measuring platform 110 is supported by the frictionless air-floating lifting device 110, the vibration force measuring device 100a can accurately and sensitively measure the real vibration force of the object to be measured 160. The vibration force measuring device 100a is particularly suitable for measuring the vibration force of small precision cooling fans for electronics, vehicles, medical use, etc. with a vibration force level of 0.001N to 0.1N.

[0046] In application, the data measured by the vibration force measurement device 100 a may be further analyzed for characteristics through frequency domain, time domain, or model, so as to facilitate subsequent intelligent management.

[0047] The lifting device of the present invention is not limited to the above-mentioned air-floating element, and a low-friction element can also be used as the lifting device. Figure 2 , which is a side view schematic diagram of a vibration force measurement device according to another embodiment of the present invention. The components and structure of the vibration force measurement device 100b of this embodiment are substantially the same as those of the vibration force measurement device 100a. The difference between the two is that the lifting device 180 of the vibration force measurement device 100b is a low friction element including a plurality of balls 184.

[0048] In some examples, the lifting device 180 may mainly include a base 182 and a plurality of balls 184. The balls 184 are rollably disposed in the base 182, and the balls 184 protrude from an upper surface 188 of the lifting device 180. The measuring platform 110 is placed on the upper surface 188 of the lifting device 180 and supported by the balls 184. The balls 184 may lift the measuring platform 110 so that the measuring platform 110 is separated from the upper surface 188 of the lifting device 180. The number of the balls 184 may be, for example, equal to or greater than three, so as to stably support the measuring platform 110.

[0049] In this embodiment, the ball bearings 184 are used to lift the measuring platform 110, which can reduce the contact area between the measuring platform 110 and the lifting device 180, thereby significantly reducing the friction between the measuring platform 110 and the lifting device 180. In this way, the friction between the measuring platform 110 and the lifting device 180 can be prevented from interfering with the vibration force signal of the object to be measured 160 in the XY plane.

[0050] In some examples, such as Figure 2 As shown, the lifting device 180 further selectively includes one or more magnetic elements 186. In addition, the measuring platform 110 may include ferromagnetic material. The magnetic element 186 can apply magnetic force to the measuring platform 110, thereby applying a pre-pressure toward the upper surface 188 of the lifting device 180 to the measuring platform 110. The application of this pre-pressure can prevent the measuring platform 110 from jumping off due to excessive shaking force generated when the object to be measured 160 is in operation, so the lifting device 180 can stably support the measuring platform 110 during the measurement process.

[0051] From the above-mentioned embodiments, it can be seen that one advantage of the present invention is that the vibration force measuring device of the present invention is provided with sensors, vibration transmission components, and elastic support components on two opposite sides of the object to be measured, thereby being able to instantly sense the vibration force of the object to be measured during operation, and to quantify and grade the vibration force data. Therefore, the vibration force measuring device has the ability to conduct a rapid full inspection, which can solve the problem that the commercial rotor vibration detection system cannot conduct a full inspection in the production line of products with high-speed rotating components such as fans.

[0052] From the above-mentioned embodiments, another advantage of the present invention is that the vibration force measuring device of the present invention is easy to set up and install, thus solving the problem of long measurement time of commercial rotor vibration detection system in product production lines with high-speed rotating elements such as fans.

[0053] From the above-mentioned implementation mode, it can be known that another advantage of the present invention is that because the measuring platform of the vibration force measuring device of the present invention can use a load cell sensor as a sensor of vibration quantity, the force change data of the object to be measured during operation can be directly measured, and it has the advantages of low cost, easy acquisition, and complete specifications.

[0054] From the above embodiments, another advantage of the present invention is that the measuring platform of the vibration force measuring device of the present invention can be supported by a lifting device with no friction or low friction, thereby preventing friction interference and effectively improving the sensitivity of the vibration force measurement of the object to be measured.

[0055] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the claims.

Claims

1. A vibration force measuring device, suitable for measuring an object to be measured having a high-speed rotating element, characterized in that: The vibration force measuring device comprises: A measuring platform having a bearing surface for bearing the object to be measured; a lifting device configured to lift the measurement platform off an upper surface of the lifting device; A sensor configured to sense the vibration amount generated when the object to be tested is in operation; a vibration transmission member having opposing first and second ends, wherein the first end is engaged with the sensor and the second end is configured to receive the vibration amount; and An elastic support member connects the measuring platform and the supporting structure, wherein the vibration transmission member and the elastic support member are respectively located at two opposite sides of the measuring platform in the horizontal direction, and the sensor is engaged with the supporting structure.

2. The vibration force measuring device according to claim 1, characterized in that: The measuring platform includes a fixture, and the fixture is configured to fix the object to be measured on the measuring platform. The fixture includes a first clamping portion and a second clamping portion that are opposite to each other.

3. The vibration force measuring device according to claim 1, characterized in that: The lifting device is an air bearing, which can use gas to float the measuring platform.

4. The vibration force measuring device according to claim 1, characterized in that: The lifting device includes at least three balls protruding from the upper surface of the lifting device, and the balls are configured to lift the measuring platform away from the upper surface of the lifting device.

5. The vibration force measuring device according to claim 4, characterized in that: The lifting device further includes at least one magnetic attraction element, and the at least one magnetic attraction element is configured to apply a magnetic attraction force to the measuring platform.

6. The vibration force measuring device according to claim 1, characterized in that: The second end of the vibration transmission element is further configured to abut against the object to be measured or the measuring platform.

7. The vibration force measuring device according to claim 1, characterized in that: The sensor is connected to the support structure, and the natural frequency of a system composed of the support structure, the sensor, and the elastic support member is lower than the rotation frequency of the object to be measured.

8. The vibration force measuring device according to claim 7, characterized in that: The natural frequency of the elastic support member is less than half of the rotation frequency of the object to be measured.

9. The vibration force measuring device according to claim 1, characterized in that: The vibration transmission member includes an ejector pin.

10. The vibration force measuring device according to claim 1, characterized in that: The elastic supporting member includes a spring.

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