CN114689165A - Sensing device with prepressing element - Google Patents
Sensing device with prepressing element Download PDFInfo
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- CN114689165A CN114689165A CN202011580672.6A CN202011580672A CN114689165A CN 114689165 A CN114689165 A CN 114689165A CN 202011580672 A CN202011580672 A CN 202011580672A CN 114689165 A CN114689165 A CN 114689165A
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- piezoelectric elements
- stress
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- 230000001681 protective effect Effects 0.000 claims description 7
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- 230000036316 preload Effects 0.000 claims 6
- 238000010586 diagram Methods 0.000 description 14
- 238000006073 displacement reaction Methods 0.000 description 8
- 238000005520 cutting process Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
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- 238000010292 electrical insulation Methods 0.000 description 2
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
- G01H11/08—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means using piezoelectric devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0061—Force sensors associated with industrial machines or actuators
- G01L5/0076—Force sensors associated with manufacturing machines
Abstract
The invention discloses a sensing device with a prepressing element, which comprises a shell, two piezoelectric elements and the prepressing element. The shell comprises a sensing part, a connecting part and a contact part. The sensing part is provided with a space for accommodating the two piezoelectric elements. The contact part is provided with a groove and is connected with the sensing part and the connecting part. The pre-pressing element comprises a pre-pressing part and a cantilever part. The prepressing part is suspended above the sensing part. The cantilever part is suspended above the contact part and comprises a fixed end and a free end. The fixed end is connected with the shell and the free end is connected with the prepressing part.
Description
Technical Field
The present invention relates to a sensing device, and more particularly, to a sensing device with a pre-pressing element.
Background
The demand for machine tools will grow dramatically due to the development of future smart manufacturing and other industries. The state of a Spindle (Spindle) of a machine tool affects the machining precision of the machine tool, so how to effectively monitor the health state of the Spindle is a key technology for intelligent manufacturing.
Currently, there is no sensing device that can directly measure the force (e.g., cutting force) that the spindle of the machine tool is subjected to. Today, only indirect methods are available for estimating the cutting force of a machine tool spindle. For example, the cutting force of the spindle of the machine tool is indirectly estimated using a vibration signal measured by a vibration sensor. However, these methods require complex algorithms and do not accurately measure the forces experienced by the machine tool spindle.
In addition, the conventional sensing devices cannot properly fix the piezoelectric element inside the sensing device, so that the performance of the sensing devices is seriously affected, and the sensing devices cannot obtain accurate sensing results.
In addition, the conventional sensing device cannot properly fix the piezoelectric element inside the sensing device, or needs to press the housing of the sensing device by a jig, so as to fix the piezoelectric element inside the sensing device, and then, the subsequent housing welding process can be performed. When the jig presses the housing of the sensing device, the piezoelectric elements disposed inside the sensing device are often broken, thereby greatly reducing the yield of the manufacturing process of the sensing device.
Disclosure of Invention
According to an embodiment of the present invention, a sensing device with a pre-stress element is provided, which includes a housing, two piezoelectric elements, a pre-stress element, and a conductive element. The shell comprises a sensing part, a connecting part and a contact part. The sensing part comprises a bottom plate and an outer wall. The outer wall is arranged on the bottom plate, so that a space is formed between the outer wall and the bottom plate. The connecting part is provided with a hole penetrating through the connecting part. The contact part is provided with a groove and is connected with the sensing part and the connecting part. Two piezoelectric elements are disposed in the space, each piezoelectric element having a first electrode and a second electrode. The pre-pressing element comprises a pre-pressing part and a cantilever part. The prepressing part is arranged above the sensing part. The cantilever part is arranged above the contact part and comprises a fixed end and a free end. The fixed end is connected with the contact part, and the free end is connected with the prepressing part so as to enable the prepressing part to generate displacement along the direction far away from the two piezoelectric elements or generate another displacement along the other direction close to the two piezoelectric elements. The conductive element is arranged between the two piezoelectric elements, wherein the conductive element is electrically connected with the first electrode of each piezoelectric element, the bottom plate is electrically connected with the second electrode of one piezoelectric element, and the prepressing part is electrically connected with the second electrode of the other piezoelectric element.
According to another embodiment of the present invention, a sensing device with a pre-pressing element is provided, which includes a housing, two piezoelectric elements and a pre-pressing element. The shell comprises a sensing part, a connecting part and a contact part. The sensing part comprises a bottom plate, an inner wall and an outer wall. The bottom plate is provided with a through hole. The inner wall is arranged on the bottom plate and surrounds the through hole to form a through hole. The outer wall is arranged on the bottom plate, so that a space is formed between the outer wall and the bottom plate. The connecting part is provided with a hole penetrating through the connecting part. The contact part is provided with a groove and is connected with the sensing part and the connecting part. Two piezoelectric elements are disposed in the space, each piezoelectric element having a first electrode and a second electrode. The pre-pressing element comprises a pre-pressing part and a cantilever part. The prepressing part is arranged above the sensing part. The cantilever part is arranged above the contact part and comprises a fixed end and a free end. The fixed end is connected with the contact part, and the free end is connected with the prepressing part so as to enable the prepressing part to generate displacement along the direction far away from the two piezoelectric elements or generate another displacement along the other direction close to the two piezoelectric elements.
The foregoing description of the present invention and the following detailed description are presented to illustrate and explain the principles and spirit of the invention and to provide further explanation of the invention as claimed.
Drawings
FIG. 1 is a schematic diagram of a sensing device with a pre-pressing element according to a first embodiment of the present invention;
fig. 2 is a structural diagram of a housing of a sensing device with a pre-pressing element according to a first embodiment of the invention;
fig. 3 is a structural diagram of a prestressing element of a sensing device with a prestressing element according to a first embodiment of the present invention;
fig. 4 is a schematic view of a pre-pressing element of a sensing device with a pre-pressing element according to a first embodiment of the present invention;
FIG. 5 is a cross-sectional view of a sensing device with a pre-stressing element according to a first embodiment of the present invention;
FIG. 6 is a schematic view of the sensing device with a pre-pressing element according to the first embodiment of the present invention mounted on the collar of the spindle;
FIG. 7 is a structural diagram of a sensing device with a pre-pressing element according to a second embodiment of the present invention;
FIG. 8 is a structural diagram of a housing of a sensing device with a pre-pressing element according to a second embodiment of the present invention;
fig. 9 is a structural diagram of a prestressing element of a sensing device with prestressing elements according to a second embodiment of the present invention.
Description of the symbols
1,2 sensing device
11,21 casing
111,211: sensing part
1111,2111 bottom plate
1112 inner wall
1113,2113 exterior wall
112,212 connecting part
113,213 contact part
12,22 piezoelectric element
121,221 first electrode
122,222 second electrode
13,23 precompression element
131,231 pre-pressing part
132,232 cantilever part
14,24 conductive element
15,25: cable wire
151 signal line
152 ground wire
16,26 electric insulation sleeve
17 protective sleeve
F1 fixed end
F2 free end
T is perforation
H is a hole
S, S' space
L is a groove
SdSpindle
R is a lantern ring
P is a contact point
K connecting element
Detailed Description
The embodiments of the sensing device with a pre-stressing element according to the present invention will be described below with reference to the accompanying drawings, in which the components may be exaggerated or reduced in size or scale for the sake of clarity and convenience in the drawing description. In the following description and/or claims, when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present; when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present, and other words used to describe the relationship between the elements or layers should be interpreted in the same manner. For ease of understanding, like elements in the following embodiments are illustrated with like reference numerals.
Please refer to fig. 1, fig. 2 and fig. 3, which are a structural diagram of a sensing device with a pre-pressing element, a structural diagram of a housing of the sensing device with the pre-pressing element and a structural diagram of the pre-pressing element of the sensing device with the pre-pressing element according to a first embodiment of the present invention. As shown in fig. 1, the sensing device 1 includes a housing 11, two piezoelectric elements 12, a pre-pressing element 13, a conductive element 14, a cable 15, and an electrical insulating sheath 16.
As shown in fig. 2, the housing 11 includes a sensing portion 111, a connecting portion 112, and a contact portion 113. The sensing portion 111 includes a bottom plate 1111, an inner wall 1112, and an outer wall 1113. The inner wall 1112 and the outer wall 1113 are disposed on the base plate 111. The bottom plate 1111 of the sensing portion 111 is electrically conductive, and the connecting portion 112 and the contact portion 113 are electrically conductive. The bottom plate 1111 has a through hole, and the inner wall 1112 surrounds the through hole to form a through hole T. An annular space S is formed between the inner wall 1112 and the outer wall 1113. The connecting portion 112 has a hole H penetrating the connecting portion 112. The contact portion 113 has a groove L, and the sensing portion 111 is connected to the connection portion 112 through the contact portion 113. In the present embodiment, the sensing portion 111 may be annular; in another embodiment, the sensing portion 111 may also be oval, polygonal, trapezoidal, irregular, or other shapes.
As shown in fig. 1 and 2, the two piezoelectric elements 12 are disposed in an annular space S formed by the inner wall 1112, the outer wall 1113 and the bottom plate 1111 of the sensing portion 111. Each piezoelectric element 12 has a first electrode 121 and a second electrode 122. In addition, each piezoelectric element 12 has a central hole so that the shape of each piezoelectric element 12 can correspond to the shape of the annular space S of the sensing part 111 so that each piezoelectric element 12 can be disposed in the annular space S.
As shown in fig. 1 to fig. 3, the pre-pressing element 13 includes a pre-pressing portion 131 and a cantilever portion 132, and both the pre-pressing portion 131 and the cantilever portion 132 are conductive. The pre-pressing portion 131 is suspended above the sensing portion 111 to cover the two piezoelectric elements 12. The pre-pressing portion 131 also has a central hole, and the shape of the pre-pressing portion 131 is made to correspond to the shape of the two piezoelectric elements 12 and the shape of the annular space S of the sensing portion 111. The cantilever 132 is suspended above the contact 113 and includes a fixed end F1 and a free end F2. The fixed end F1 of the cantilever 132 is connected to the contact 113, and the free end F2 of the cantilever 132 is connected to the pre-pressing part 131, so that the pre-pressing part 131 has a function of generating a displacement in a direction away from the two piezoelectric elements 12 or a function of generating another displacement in another direction close to the two piezoelectric elements 12. Further, when the pre-pressing portion 131 is subjected to an external force and is displaced in a direction away from the two piezoelectric elements 12, the cantilever portion 132 can generate a restoring force in a direction approaching the two piezoelectric elements 12, so that the pre-pressing portion 131 can generate a pre-pressing force and apply the pre-pressing force to the two piezoelectric elements 12.
In addition, the cantilever 132 may further include two fixed end extensions E. Two fixed end extensions E are disposed at both sides of the fixed end F1 and connected to the contact portion 113 of the housing 11. The fixed end F1 of the cantilever 132 and the two fixed end extensions E form a U-shape. By this design, the restoring force generated by the pre-pressing element 13 can be adjusted by changing the length of the two fixed end extensions E. When the pre-pressing portion 131 is to generate a same displacement, the longer the length of the two fixed end extensions E is, the greater the restoring force generated by the pre-pressing element 13 is. In contrast, when the pre-pressing portion 131 is to generate a same displacement, the shorter the length of the two fixed end extensions E is, the smaller the restoring force generated by the pre-pressing element 13 is. The length of the two fixed end extensions E can be adjusted for different applications to meet the requirements of different situations.
Please refer to fig. 4, which is a schematic diagram of a pre-pressing element of a sensing device with a pre-pressing element according to a first embodiment of the present invention. As shown in the figure, each piezoelectric element 12 has a first electrode 121 and a second electrode 122. In the present embodiment, one piezoelectric element 12 is disposed on the bottom plate 1111 of the sensing part 111 and is in contact with the bottom plate 1111. A conductive element 14 is disposed on the piezoelectric element 12 and another piezoelectric element 12 is disposed on the conductive element 14 such that the conductive element 14 is disposed between the two piezoelectric elements 12. Therefore, the conductive element 14 can electrically connect the first electrodes 121 of the respective piezoelectric elements 12. With the above-described structure, the bottom plate 1111 of the sensing portion 111 may be electrically connected to the second electrode 122 of one of the piezoelectric elements 12, and the pre-pressing portion 131 of the pre-pressing element 13 may be electrically connected to the second electrode 122 of the other piezoelectric element 12. In one embodiment, the conductive element 14 may be a metal sheet, such as a copper sheet, iron sheet, or other conductive element.
When the pre-pressing portion 131 of the pre-pressing element 13 is subjected to an external force and is displaced in a direction away from the two piezoelectric elements 12, the cantilever portion 132 of the pre-pressing element 13 can generate a restoring force in a direction approaching the two piezoelectric elements 12. The restoring force causes the pre-pressing portion 131 of the pre-pressing element 13 to press one of the piezoelectric elements 12, so that the pre-pressing portion 131 of the pre-pressing element 13 can generate a pre-pressing force and apply the pre-pressing force to the two piezoelectric elements 12. Therefore, the pre-pressing element 13 can effectively fix the two piezoelectric elements 12 inside the sensing device 1 by the pre-pressing force. As can be seen from the above, the pre-pressing element 13 can generate pre-pressing force and apply the pre-pressing force to the two voltage elements 12, so that the phenomenon of poor contact between the voltage elements 12 and the electrical channels can be avoided, and the accuracy and sensitivity of the sensing device 1 can be improved. In addition, the pre-stress generated by the pre-pressing element 13 can also effectively fix the two piezoelectric elements 12 to prevent the two piezoelectric elements 12 from being deformed and displaced to damage, so that the yield of the sensor device 1 during manufacturing and the reliability of future use can be effectively improved.
As shown in fig. 1 and 2, the cable 15 passes through the hole H of the connecting portion 112 and extends to the groove L of the contact portion 113, and is connected to the conductive element 14. In addition, the electrical insulating sheath 16 covers a portion of the cable 15 and a portion of the conductive element 14 to provide electrical insulation. In one embodiment, the electrically insulating sleeve 16 may be a heat shrink, an insulating glue, an adhesive tape, or other similar electrically insulating elements.
Please refer to fig. 5, which is a cross-sectional view of a sensing device with a pre-pressing element according to a first embodiment of the present invention. As shown, the cable 15 includes a signal line 151 and a ground line 152, and the ground line 152 is a hollow tubular structure. The ground line 152 surrounds the signal line 151 and is electrically insulated from the signal line 151.
The signal line 151 is connected to the conductive element 14 to form a first electrical path. The electrically insulating sheath 16 covers the signal line 151, the conductive element 14, and the contact P connecting the signal line 151 and the conductive element 14.
In addition, as mentioned above, the prepressing part 131 and the cantilever part 132 of the prepressing element 13 may be conductive, and the bottom plate 1111, the contact part 113 and the connection part 112 of the sensing part 111 of the housing 11 may be conductive. As can be seen in fig. 5, the ground wire 152 of the cable wire 15 is connected to the connection portion 112 of the housing 11. The fixed end F1 of the cantilever portion 132 of the pre-pressing element 13 is connected to the contact portion 113 of the housing. Therefore, the connecting portion 112 of the housing 11 is connected to the prestressing portion 131 of the prestressing element 13 through the cantilever portion 132 of the prestressing element 13. The prepressing section 131 of the prepressing element 13 contacts the second electrode 122 of one of the piezoelectric elements 12. Therefore, the ground wire 152 of the cable 15, the connecting portion 112 of the housing 11, the cantilever portion 132 of the pre-pressing element 13, and the pre-pressing portion 131 form a second electrical path, so that the ground wire 152 of the cable 15 can be electrically connected to the second electrode contacted by the pre-pressing portion 122 through the second electrical path.
In addition, the ground wire 152 of the cable 15 is connected to the connection portion 112 of the housing 11, and the connection portion 112 of the housing 11 is connected to the bottom plate 1111 of the sensing portion 111 of the housing 11 through the contact portion 113 of the housing 11. The bottom plate 1111 of the sensing part 111 contacts the second electrode 122 of the other piezoelectric element 12. Therefore, the ground wire 152 of the cable 15, the connecting portion 112 of the housing 11, the contact portion 113, and the bottom plate 1111 of the sensing portion 111 form another second electrical path, so that the ground wire 152 of the cable 15 can be electrically connected to the second electrode contacted by the bottom plate 1111.
As shown in fig. 5, the sensing device 1 may further include a protective sheath 17, which covers the contact portion 113 and the connection portion 112 of the housing 11 and the cable 15 to provide a good protection function. In one embodiment, protective sleeve 17 may be a heat shrink or other similar element.
As can be seen from the above, the sensing device 1 has a special structure design to provide a complete electrical path, so that the cable 15 can be directly electrically connected to the two voltage devices 12 disposed inside the sensing device 1 without additional connectors or joints. This not only simplifies the assembly process of the sensing device 12, but also reduces the overall size of the sensing device 12.
Please refer to fig. 6, which is a schematic diagram illustrating a sensing device with a pre-pressing element according to a first embodiment of the present invention installed on a collar of a spindle. As shown in the drawing, the sensing portion 111 of the housing 11 of the sensing device 1 has a through hole, so that the sensing device 1 can be stably fixed to the spindle S of the machine tool by a connecting member K (e.g., a screw)dSo that the sensing device 1 can be more effectively connected with the main shaft SdIntegration, and therefore the sensing device 1 directly measures the spindle S of the machine tooldThe bearing force of the device does not need complex algorithm, thereby effectively reducing the cost.
Of course, the above description is only exemplary, and the structure of each element, the connection relationship of each element and the operation manner of the sensing device 1 can be changed according to the actual requirement, and the invention is not limited thereto.
It should be noted that there is no sensing device that can directly measure the force (e.g., cutting force) applied to the spindle of the machine tool. Today, only indirect methods are available for estimating the cutting force of a machine tool spindle. For example, the cutting force of the spindle of the machine tool is indirectly estimated using a vibration signal measured by a vibration sensor. However, these methods require complex algorithms and do not accurately measure the forces experienced by the machine tool spindle. On the contrary, according to the embodiment of the invention, the sensing device can be arranged on the main shaft sleeve ring sleeved on the machine tool, so that the sensing device can be effectively integrated with the main shaft to directly measure various forces borne by the main shaft, a complex algorithm is not needed, and the measuring accuracy can be effectively improved.
Furthermore, according to the embodiment of the present invention, the sensing portion of the housing of the sensing device has a through hole, and the sensing portion can be screwed into the through hole through a connecting element (such as a screw), so that the sensing device can be stably fixed to the collar of the spindle of the machine tool, and the sensing device can be more effectively integrated with the spindle.
In addition, the conventional sensing devices can not properly fix the piezoelectric element inside the sensing devices, which can seriously affect the performance of the sensing devices, and thus the sensing devices can not obtain accurate sensing results. On the contrary, according to the embodiment of the present invention, the sensing device has the pre-pressing element, which can apply a proper pre-pressing force to the piezoelectric element inside the sensing device, so as to increase the effective stressed area of the piezoelectric element, thereby effectively improving the measurement sensitivity of the sensing device.
In addition, the conventional sensing device cannot properly fix the piezoelectric element inside the sensing device, or a jig is required to press the housing of the sensing device, so that the subsequent housing welding process can be performed after the piezoelectric element inside the sensing device is fixed. When the jig presses the housing of the sensing device, the piezoelectric elements disposed inside the sensing device are often broken, thereby greatly reducing the yield of the manufacturing process of the sensing device. On the contrary, according to the embodiment of the invention, the sensing device has the cantilever beam type pre-pressing element, which can apply a proper pre-pressing force to the piezoelectric element inside the sensing device, so that the piezoelectric element can be effectively fixed inside the sensing device, the piezoelectric element is prevented from being broken, and the manufacturing process yield of the assembly of the sensing device is greatly improved.
Furthermore, according to the embodiment of the present invention, the sensing device has a special structural design, so that the piezoelectric element disposed on the sensing device can be directly electrically connected to the cable, and no additional connector or joint is required, thereby simplifying the steps of assembling the sensing device to the spindle. The electrical connection between the piezoelectric element and the cable line will be described in more detail below.
Please refer to fig. 7, fig. 8 and fig. 9, which are a structural diagram of a sensing device with a pre-pressing element, a structural diagram of a housing of the sensing device with a pre-pressing element and a structural diagram of a pre-pressing element of the sensing device with a pre-pressing element according to a second embodiment of the present invention. As shown in fig. 7, the sensing device 2 includes a housing 21, two piezoelectric elements 22, a pre-pressing element 23, a conductive element 24, a cable 25, and an electrically insulating sheath 26.
As shown in fig. 8, the housing 21 includes a sensing portion 211, a connecting portion 212, and a contact portion 213. Unlike the previous embodiment, the sensing portion 211 includes a bottom plate 2111 and an outer wall 2113 but does not include an inner wall, and the bottom plate 1111 does not have a through hole. Similarly, the outer wall 2113 is disposed on the bottom plate 211 and surrounds the bottom plate 211 to form a space S'. The bottom plate 2111 of the sensing portion 211 is electrically conductive, and the connection portion 212 and the contact portion 213 are electrically conductive. The connecting portion 212 has a hole H penetrating the connecting portion 212. The contact portion 213 has a groove L, and the sensing portion 211 is connected with the connection portion 212 through the contact portion 213. In the present embodiment, the sensing portion 211 may have a disc shape. In another embodiment, the sensing portion 211 may also be oval, polygonal, trapezoidal, irregular, or other shapes.
As shown in fig. 7 and 8, the two piezoelectric elements 22 are disposed in a space S' formed by the outer wall 2113 and the bottom plate 2111 of the sensing portion 211. Each piezoelectric element 22 has a first electrode 221 and a second electrode 222. Unlike the first embodiment, each piezoelectric element 22 does not have a central hole.
As shown in fig. 7 to 9, the pre-pressing element 23 includes a pre-pressing portion 231 and a cantilever portion 232, and both the pre-pressing portion 231 and the cantilever portion 232 are conductive. The pre-pressing part 231 is suspended above the sensing part 211 to cover the two piezoelectric elements 22. Unlike the first embodiment, the prepressing section 231 does not have a central hole. The cantilever 232 is suspended above the contact 213 and includes a fixed end F1 and a free end F2. The fixed end F1 of the cantilever 232 is connected to the contact 213, and the free end F2 of the cantilever 232 is connected to the pre-pressing part 231.
The cable 25 passes through the hole H of the connecting portion 212 and extends to the groove L of the contact portion 213, and is connected to the conductive member 24. An electrically insulating sheath 26 covers a portion of the cable 25 and a portion of the conductive element 24 to provide electrical insulation.
Except for the structure of the sensing portion 211 of the housing 21, the structure of the pre-pressing portion 231 of the pre-pressing element 23, and the structures of the two piezoelectric elements 22, the structure of other elements of the sensing device 2, the connection relationship of the elements, and the operation manner are similar to those of the first embodiment, and therefore, the detailed description thereof is omitted.
As described above, the sensing portion 211 of the housing 21 includes the bottom plate 2111 and the outer wall 2113 but does not include the inner wall, and the sensing portion 211 of the housing 21 has a disk shape. Therefore, the sensing device 2 is not limited to the application of measuring the cutting force of the spindle of the machine tool, and may be installed at other positions to implement various applications, so that the application range of the sensing device 2 is wider.
Of course, the above description is only an example, and the structure of each element, the connection relationship of each element and the operation manner of the sensing device 2 can be changed according to the actual requirement, and the invention is not limited thereto.
In summary, according to the embodiments of the present invention, the sensing device can be disposed on the spindle sleeve ring of the machine tool, so that the sensing device can be effectively integrated with the spindle to directly measure various forces borne by the spindle, and therefore, a complex algorithm is not required and the measurement accuracy can be effectively improved at low cost.
Further, according to the embodiment of the present invention, the sensing portion of the housing of the sensing device has a through hole, and the through hole can be screwed by a connecting element (e.g., a screw), so that the sensing device can be stably fixed to the spindle collar of the machine tool, and the sensing device can be more effectively integrated with the spindle.
In addition, according to the embodiment of the invention, the sensing device is provided with the cantilever type pre-pressing element, which can apply appropriate pre-pressing force to the piezoelectric element inside the sensing device, so that the effective stressed area of the piezoelectric element is increased, and the measurement sensitivity of the sensing device can be effectively improved.
In addition, according to the embodiment of the invention, the sensing device is provided with the cantilever beam type pre-pressing element, and the piezoelectric element in the sensing device can be applied with proper pre-pressing force, so that the piezoelectric element can be effectively fixed in the sensing device, the piezoelectric element is prevented from being broken, and the manufacturing process yield of the assembly of the sensing device is greatly improved.
Furthermore, according to the embodiments of the present invention, the sensing device has a special structure design, so that the piezoelectric element disposed on the sensing device can be electrically connected to the cable without an additional connector or joint. Therefore, the steps of assembling the sensing device to the spindle can be simplified, and the overall volume of the sensing device can be reduced.
It can be seen that the present invention has achieved the desired enhanced effect through the prior art, and is not readily appreciated by those skilled in the art, and its improvements and practical applications have been made to meet the requirements of the patent applications.
The foregoing is by way of example only, and not limiting. It is intended that all equivalent modifications or variations be included in the appended claims without departing from the spirit and scope of the invention.
Claims (29)
1. A sensing device with a pre-load element, comprising:
a housing, comprising:
a sensing portion comprising:
a base plate; and
an outer wall disposed on the bottom plate and surrounding the bottom plate to form a space;
a connecting part having a hole penetrating the connecting part; and
a contact part which is provided with a groove and is connected with the sensing part and the connecting part;
two piezoelectric elements disposed in the space, wherein each of the piezoelectric elements has a first electrode and a second electrode;
a preload element comprising:
a prepressing part suspended above the sensing part; and
a cantilever part suspended above the contact part, wherein the cantilever part comprises a fixed end and a free end, the fixed end is connected with the shell, and the free end is connected with the prepressing part;
and the conductive element is arranged among the piezoelectric elements, wherein the conductive element is electrically connected with the first electrode of each piezoelectric element, the bottom plate is electrically connected with the second electrode of one piezoelectric element, and the prepressing part is electrically connected with the second electrode of the other piezoelectric element.
2. The sensing device with pre-stress element as claimed in claim 1, wherein the cantilever generates a restoring force toward the piezoelectric elements when the pre-stress portion is displaced away from the piezoelectric elements by an external force.
3. A sensing device with a pre-pressing element as claimed in claim 2, wherein when the external force is removed, the restoring force causes the pre-pressing portion to press against one of the piezoelectric elements.
4. The sensing device with pre-pressing element as claimed in claim 1, wherein the fixing end is connected to the contact portion of the housing.
5. The apparatus for sensing a pre-stress element as claimed in claim 1, wherein the cantilever further includes two fixed end extensions disposed on two sides of the fixed end and connected to the contact portion of the housing.
6. The sensing device with pre-stressed elements as claimed in claim 1, wherein the sensing portion further comprises an inner wall disposed on the bottom plate.
7. The apparatus according to claim 6, wherein the base plate has a through hole, and the inner wall surrounds the through hole to form a through hole.
8. The sensing device with pre-stressed element as claimed in claim 1, further comprising a cable, wherein the cable comprises a signal line and a ground line, wherein the ground line surrounds the signal line and is electrically insulated from the signal line.
9. The sensing device with pre-stress element as claimed in claim 8, wherein the signal line is connected to the conductive element such that the signal line is electrically connected to the first electrode of each of the piezoelectric elements.
10. The sensing device with pre-stress element as claimed in claim 8, wherein the pre-stress portion and the cantilever portion of the pre-stress element are both conductive, the contact portion and the connecting portion of the housing are both conductive, the ground line is connected to the connecting portion, the pre-stress portion contacts the second electrode of one of the piezoelectric elements, and the ground line is electrically connected to the second electrode of the piezoelectric element through the connecting portion, the contact portion, the cantilever portion and the pre-stress portion.
11. The sensing device with pre-stress element as claimed in claim 10, wherein the bottom plate of the sensing portion of the housing is electrically conductive, the ground wire is connected to the connecting portion and the bottom plate contacts the second electrode of another one of the piezoelectric elements, and the ground wire is electrically connected to the second electrode of the piezoelectric element through the connecting portion, the contact portion and the bottom plate.
12. The sensing device with pre-stressed element as claimed in claim 8, further comprising an electrically insulating sheath covering the signal line, the conductive element and the contact, the contact connecting the signal line and the conductive element.
13. The sensing device with pre-stressed element as claimed in claim 1, further comprising a protective sheath covering the contact portion, the connecting portion and the cable.
14. The sensing device with pre-stressed element as claimed in claim 13, wherein the protective sheath is a heat-shrinkable sleeve.
15. The sensing device with pre-stress element as claimed in claim 1, wherein the sensing portion is circular, elliptical, polygonal, trapezoidal or irregular.
16. A sensing device with a pre-load element, comprising:
a housing, comprising:
a sensing portion comprising:
a base plate having a through hole;
the inner wall is arranged on the bottom plate and surrounds the through hole to form a through hole; and
the outer wall is arranged on the bottom plate and surrounds the bottom plate, so that an annular space is formed between the outer wall and the inner wall;
a connecting part having a hole penetrating the connecting part; and
a contact part which is provided with a groove and is connected with the sensing part and the connecting part;
two piezoelectric elements disposed in the space, wherein each of the piezoelectric elements has a first electrode and a second electrode; and
a preload element comprising:
a prepressing part suspended above the sensing part; and
the cantilever part is suspended above the contact part and comprises a fixed end and a free end, wherein the fixed end is connected with the shell, and the free end is connected with the prepressing part.
17. The sensing device with pre-stress element as claimed in claim 16, wherein the cantilever generates a restoring force toward the piezoelectric element when the pre-stress portion is subjected to an external force and is displaced away from the piezoelectric elements.
18. A sensing device with a pre-pressing element as claimed in claim 17, wherein the restoring force causes the pre-pressing portion to press against one of the piezoelectric elements when the external force is removed.
19. The apparatus for sensing a device with a pre-load element as claimed in claim 16, wherein the fixed end is connected to the contact portion of the housing.
20. The apparatus for sensing a preload element as claimed in claim 16, wherein the cantilever further comprises two fixed end extensions disposed on opposite sides of the fixed end and connected to the contact portion of the housing.
21. The sensing device with pre-stress element as claimed in claim 16, further comprising a conductive element electrically connected to the first electrode of each of the piezoelectric elements, the bottom plate electrically connected to the second electrode of one of the piezoelectric elements, and the pre-stress portion electrically connected to the second electrode of the other of the piezoelectric elements.
22. The sensing device with pre-stressed element as claimed in claim 21, further comprising a cable, the cable comprising a signal line and a ground line, wherein the ground line surrounds the signal line and is electrically insulated from the signal line.
23. The sensing device with pre-stress element of claim 22, wherein the signal line is connected to the conductive element such that the signal line is electrically connected to the first electrode of each of the piezoelectric elements.
24. The sensing device with pre-stress element as claimed in claim 22, wherein the pre-stress portion and the cantilever portion of the pre-stress element are both conductive, the contact portion and the connecting portion of the housing are both conductive, the ground line is connected to the connecting portion, the pre-stress portion contacts the second electrode of one of the piezoelectric elements, and the ground line is electrically connected to the second electrode of the piezoelectric element through the connecting portion, the contact portion, the cantilever portion and the pre-stress portion.
25. A sensing device with a pre-pressing element as claimed in claim 22, wherein the bottom plate of the sensing portion of the housing is electrically conductive, the ground wire is connected to the connecting portion, the bottom plate contacts the second electrode of another one of the piezoelectric elements, and the ground wire is electrically connected to the second electrode of the piezoelectric element through the connecting portion, the contact portion and the bottom plate.
26. The sensing device with a pre-stressed element as claimed in claim 22, further comprising an electrically insulating sheath covering the signal line, the conductive element and the contact, the contact connecting the signal line and the conductive element.
27. The sensing device with pre-stressed element as claimed in claim 22, further comprising a protective sheath covering the contact portion, the connecting portion and the cable.
28. A sensing device with pre-stressed elements as in claim 27, wherein the protective sheath is a heat-shrinkable sleeve.
29. The sensing device with pre-stress element as claimed in claim 16, wherein the sensing portion is circular, elliptical, polygonal, trapezoidal or irregular.
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| CN202011580672.6A CN114689165A (en) | 2020-12-28 | 2020-12-28 | Sensing device with prepressing element |
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| CN202011580672.6A CN114689165A (en) | 2020-12-28 | 2020-12-28 | Sensing device with prepressing element |
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