A sensor unit and a strain sensor using the same

Abstract

The utility model relates to sensor technical field, concretely relates to a kind of sensing unit and the strain sensor using the sensing unit, to solve the problem of the measurement accuracy and stability of pressure detection device insufficient.Its technical scheme main point is:a kind of sensing unit includes pressure-bearing end and object end, pressure-bearing end extends to object end and is fixedly connected to form at least one strain area, strain area is provided with strain gauge, strain gauge is connected with signal conversion device by signal line, when the force in the direction of object end is applied to pressure-bearing end, the surface of strain area produces deformation, signal conversion device converts the deformation of strain area into strain signal, sensing unit reduces lateral force interference, error, force transmission loss by structural design, improves measurement accuracy, guarantees the stability and durability of sensing unit, strain sensor reduces the link of strain transmission, accelerates signal response, to ensure that operator can adjust in time.

Description

Technical Field

[0001] This utility model relates to the field of sensors, and in particular to a sensing unit and a strain sensor using the sensing unit. Background Technology

[0002] Chinese utility model patent CN211762069U discloses an automatic pressure detection device for a circular die-cutting machine. The pressure detection device is installed by a sliding connection. When the rotating handle is lifted upward, it will press the sliding seat downward, thereby adjusting the pressure of the circular die and the circular cutter. When the sliding seat presses downward, the pressing part will bear the downward part, and the spring at the bottom of the bearing part will deform and contract. At this time, the bearing part will slide downward. When the spring contracts, it will generate a reaction force and transmit it to the pressure sensor on the bearing part. The pressure value received by the pressure sensor will be transmitted to the display screen through the wire for display, thereby realizing the quantification and recording of pressure.

[0003] However, the pressure transmission of the aforementioned pressure detection device relies on the indirect path of the sliding seat pressing down the bearing part, which in turn causes the spring to contract, and finally the reaction force is transmitted to the sensor. Furthermore, the spring has problems such as elastic fatigue, nonlinear deformation, and deformation feedback lag. If there is a slight misalignment between the sliding seat and the bearing part during the pressing process, the uneven force on the spring will cause the pressure received by the pressure sensor to be inaccurate. Pressure changes are transmitted through multiple links, resulting in response delays, which can lead to over- or under-adjustment. Moreover, the spring is sensitive to external vibrations. External vibrations can cause the spring to deform additionally, which can also cause the sensor to receive incorrect pressure signals.

[0004] Therefore, a new technical solution is proposed to solve the problems existing in the current technology. Utility Model Content

[0005] The purpose of this invention is to provide a sensing unit and a strain sensor using the sensing unit to solve the problem of insufficient measurement accuracy and stability of pressure detection devices in the prior art.

[0006] The technical solution of this utility model is: a sensing unit, including: a pressure-bearing end and a resistance end, wherein the pressure-bearing end extends toward the resistance end and is fixedly connected thereto to form at least one strain zone, wherein a strain gauge is provided in the strain zone, and the strain gauge is connected to a signal conversion device through a signal line. When a force is applied to the pressure-bearing end in the direction toward the resistance end, the surface of the strain zone deforms, and the signal conversion device converts the deformation of the strain zone into a strain signal.

[0007] Preferably, the strain zone includes at least one support member, and the strain gauge is disposed on the outer surface of the support member.

[0008] Preferably, the pressure-bearing end, the object-abutting end, and the support member are constructed as an integral structure, and the support member forms an arc-shaped transition with the pressure-bearing end and the object-abutting end, respectively.

[0009] Preferably, the pressure-bearing end and the object-abutting end are coaxially arranged, and the pressure-bearing end is used to withstand the force applied by the pressure-bearing component to the sensing unit.

[0010] Preferably, the orthographic projection of the strain gauge on the object-bearing end falls completely within the orthographic projection area of ​​the bearing end on the upper surface of the object-bearing end.

[0011] The strain sensor is also disclosed, including a sensing unit as described in any of the above claims, and further including: a housing disposed outside the sensing unit, the housing having a through hole extending vertically, at least one end of the pressure-bearing end and the object-abutting end passing through the through hole and fixedly connected to the housing, and a pressure-applying component disposed above the pressure-bearing end.

[0012] Preferably, a pressure-bearing component is provided above the pressure-bearing end, and a groove is provided at the upper end of the pressure-bearing component. When pressure is applied to the pressure-bearing end, the pressure-bearing component passes into the groove and abuts against the inner bottom wall of the groove.

[0013] Preferably, the bottom area of ​​the pressure-bearing component is larger than the area of ​​the upper end face of the pressure-bearing end.

[0014] Preferably, a display is fixedly connected to one side wall of the housing, and the signal conversion device is fixedly connected between the housing and the display.

[0015] Preferably, the housing has a receiving cavity communicating with the through hole, and a power supply device is provided in the receiving cavity to supply power to the signal conversion device.

[0016] Compared with the prior art, the advantages of this utility model are: (1) The sensing unit reduces lateral force interference, error and force transmission loss through structural design, improves measurement accuracy and ensures the stability and durability of the sensing unit.

[0017] (2) The strain sensor reduces the strain transmission links, speeds up the signal response, and reduces the feedback delay, thereby ensuring that the operator can make timely adjustments and reducing the additional deformation effect of external vibration on the sensing unit.

[0018] (3) It can quantify the pressure value through the pressure signal from the strain sensor, reduce feedback error and delay, facilitate the adjustment by the commissioning personnel at any time, quickly adjust the pressure, and detect the feedback pressure change in real time during mechanical operation to ensure pressure stability. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1This is a schematic diagram of the structure of the sensing unit described in this utility model; Figure 2 This is a circuit / signal connection diagram of the signal conversion device described in this utility model; Figure 3 This is a schematic diagram of the structure of the strain sensor described in this utility model; Figure 4 This is a schematic diagram of the strain sensor of this utility model without the outer cover plate and the pressure component; Figure 5 A cross-sectional view of the strain sensor of this utility model without the outer cover plate and the pressure component; Figure 6 This is a schematic diagram of the strain sensor of this utility model installed on a circular knife machine.

[0020] The components are as follows: 1. Sensing unit; 11. Pressure-bearing end; 12. Object-abutting end; 13. Strain zone; 131. Support component; 132. Strain gauge; 133. Signal conversion device; 2. Strain sensor; 21. Housing; 211. Through hole; 3. Pressurizing component; 4. Pressure-bearing component; 41. Groove; 5. Display; 6. Power supply device; 71. Power roller; 72. Driven roller; 73. Circular cutter roller; 74. Motor; 75. Reducer. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to specific embodiments: like Figure 1 , Figure 2 and Figure 5As shown, a sensing unit 1 includes a pressure-bearing end 11 and a contact end 12. The pressure-bearing end 11 is used to withstand the force applied to the sensing unit 1 by the pressure-applying component 3. The contact end 12 is in contact with the object to be measured. The pressure-bearing end 11 extends towards the contact end 12 and is fixedly connected to it to form at least one strain zone 13. The strain zone 13 includes at least one support member 131. When the number of support members 131 is greater than or equal to two, adjacent support members 131 do not interfere with each other. Multiple support members 131 can be arranged in a parallel array, or they can be arranged perpendicularly or at an angle to each other. Strain gauges 132 are attached to the strain zone 13. Connected to the signal conversion device 133 via a signal line, the support end 12 directly contacts the object under test, forming a stable force transmission path and reducing strain signal attenuation or delay during transmission. The support member 131 reduces the risk of excessive deformation or breakage of the strain zone 13, extending the service life of the sensing unit 1. The deformation of each support member 131 is independent, avoiding mutual interference between adjacent support members 131 under force, ensuring that the signal of the strain zone 13 accurately reflects the magnitude of the external force. When there are multiple support members 131, extreme values ​​can be removed and the average of multiple sets of data can be taken. The support member 131 also reduces the overall strain of the strain zone 13. The rigidity of the body enhances the sensitivity of the signal conversion device 133 to small strains. The orthographic projection of the strain gauge 132 on the bearing end 12 falls entirely within the orthographic projection area of ​​the bearing end 11 on the upper surface of the bearing end 12, ensuring the spatial and structural compatibility of the strain zone 13. The strain gauge 132 is located on the main path of force transmission, sensing the deformation of the support member 131 due to the pressure applied to the bearing end 11. This reduces interference signals caused by invalid deformation in non-stressed areas, such as local deformation caused by device vibration or installation deviation, thereby reducing measurement errors. The strain gauge 132 is attached... On the support 131, minute deformations can be accurately sensed, and the converted strain signal can accurately reflect the magnitude of the pressure force, significantly improving the real-time performance of strain signal acquisition. The strain gauge 132 is made of a material with a high strain sensitivity coefficient and stable electrical properties, which can accurately convert mechanical strain into a measurable electrical signal. It is preferably made of metal alloy strain-sensitive materials such as aluminum alloy, constantan, and nickel-chromium alloy. When the pressure end 11 is squeezed towards the object end 12, the surface of the strain zone 13 deforms. The signal conversion device 133 can sensitively capture the deformation of the strain zone 13 and convert it into a strain signal.

[0022] like Figures 3-6As shown, the strain sensor 2 includes the aforementioned sensing unit 1 and a housing 21 disposed outside the sensing unit 1. A display 5 is mounted on one side wall of the housing 21. A signal conversion device 133 is installed between the housing 21 and the display 5. A receiving cavity communicating with a through hole 211 is opened inside the housing 21. A power supply device 6 is installed in the receiving cavity and supplies power to the signal conversion device 133. The housing 21 has a through hole 211 extending vertically. At least one end of the pressure-bearing end 11 and the object-abutting end 12 passes through the through hole 211 and is thus installed inside the housing 21, ensuring that the pressure-bearing end 11 can receive the pressure of the pressure-applying component 3 and that the object-abutting end 12 can fit against the object to be measured, effectively transmitting external force to generate strain and avoiding displacement during measurement. The pressure-bearing end 11 is used to withstand the force applied by the pressure-applying component 3 to the sensing unit 1. A pressure-bearing component 4 can be optionally disposed above the pressure-bearing end 11, abutting against the pressure-bearing end 11. The bottom area of ​​the pressure-bearing component 4 is larger than that of the pressure-bearing end 11. The area of ​​the upper end face of the pressure end 11 is such that the upper end of the pressure bearing member 4 is provided with a groove 41. When the pressure bearing end 11 is pressurized, the pressure bearing member 3 passes through the groove 41 and abuts against the inner bottom wall of the groove 41. The pressure bearing member 4 is in direct contact with the pressure bearing end 11, which can evenly distribute the pressure of the pressure bearing member 3 to the pressure bearing end 11, avoid excessive local pressure of the pressure bearing member 3 causing deformation and damage to the pressure bearing end 11, reduce direct friction between the pressure bearing member 3 and the pressure bearing end 11, protect the surface of the pressure bearing end 11, and extend the service life of the sensing unit 1. The groove 41 restricts the lateral displacement of the pressure bearing member 3, ensures that the pressure is transmitted to the pressure bearing end 11 along the axis, reduces the lateral force generated by the pressure displacement, and reduces the error in the strain signal sensed by the strain zone 13, thereby improving the measurement accuracy. In at least one embodiment, the upper end face of the pressure bearing member 4 is not higher than the upper end face of the housing 21. When not pressurized, the pressure bearing member 4 and the pressure bearing end 11 are completely contained in the through hole 211, avoiding protrusion of the housing 21 surface and collision damage.

[0023] Example

[0024] like Figures 1-5As shown, a sensing unit 1 is an integrally formed columnar mandrel. The pressure-bearing end 11, the object-abutting end 12, and the support member 131 are constructed as a single unit. This integrated structure eliminates the need for additional connecting parts, reducing processing steps and assembly errors. Furthermore, the support member 131 forms an arc-shaped transition with both the pressure-bearing end 11 and the object-abutting end 12, resulting in more uniform overall mechanical properties. This disperses stress throughout the entire structure, significantly reducing the risk of localized stress concentration and extending the service life of the sensing unit 1. Using right-angle or acute-angle transitions prevents stress concentration at the corners when external forces are transmitted to the connection points. The arc-shaped transition allows stress to be evenly distributed along the curved surface, avoiding the risk of breakage and ensuring better linearity of the strain signal sensed by the strain gauge 132. The pressure-bearing end 11 and the object-abutting end 12 have circular cross-sectional shapes and are coaxially arranged. In other embodiments... In the example, the cross-sectional shape of the pressure-bearing end 11 and the object-abutting end 12 can also be a rectangle, a square, a hexagon, or other shapes. The coaxial arrangement of the pressure-bearing end 11 and the object-abutting end 12 ensures that the external force is transmitted along the axis, avoids interference from lateral forces caused by force offset, and reduces the error between the strain signal sensed by the subsequent strain zone 13 and the actual pressure state of the object to be measured. The strain zone 13 includes two support members 131. The height of the sensing unit 1 is greater than the diameter of the pressure-bearing end 11 and the object-abutting end 12, the length of the support member 131 is greater than the radius of the pressure-bearing end 11 and the object-abutting end 12, and the width of the support member 131 is less than the radius of the pressure-bearing end 11 and the object-abutting end 12. A strain gauge 132 made of aluminum alloy is pasted on the outer surface of the support member 131. The strain gauge 132 is connected to the signal conversion device 133 through a signal line. The signal conversion device 133 includes a PCB board and a controller.

[0025] like Figures 3-6 As shown, the strain sensor 2 includes the aforementioned sensing unit 1 and a housing 21. The housing 21 has a through hole 211 extending vertically. The pressure-bearing end 11 and the object-abutting end 12 are inserted into the through hole 211 and installed inside the housing 21. A pressure-bearing component 4 is placed above the pressure-bearing end 11 and abuts against the pressure-bearing end 11. A circular groove 41 is provided at the upper end of the pressure-bearing component 4. The pressure-bearing component 4 is used to withstand the force applied to the sensing unit 1 by the pressure-applying component 3. The pressure-applying component 3 is a set screw. When pressurizing the pressure-bearing end 11, the pressure-applying component 3 is rotated to penetrate into the groove 41 and abut against the inner bottom wall of the groove 41. The pressure-applying component 3 drives the pressure-bearing component 4 to pressurize the pressure-bearing end 11. A receiving cavity communicating with the through hole 211 is provided inside the housing 21. A power supply device 6 for powering the signal conversion device 133 is installed in the receiving cavity. The power supply device 6 is a battery pack.

[0026] like Figure 6As shown, the circular cutter includes a power roller 71, a driven roller 72, and a circular cutter roller 73. The power roller 71 is driven by a motor 74 equipped with a reducer 75. After the circular cutter is started, the power roller 71 drives the driven roller 72 to rotate. The material is put into the gap between the driven roller 72 and the circular cutter roller 73 for cutting. The strain sensor 2 is installed on the two side supports of the circular cutter so that the abutting end 12 abuts against the circular cutter roller 73. The pressure member 3 acts on the pressure bearing end 11, so that the strain sensor 2 measures the deformation through the strain gauge 132. After the signal conversion device 133 processes the deformation into a strain signal, the pressure value or curve applied between the driven roller 72 and the circular cutter roller 73 is finally displayed on the display 5. The operator adjusts the pressure data of the sensing units 1 on both sides of the circular cutter roller 73 according to the displayed pressure value. When the pressure needs to be adjusted, the operator applies a force to the pressure bearing end 11 in the direction of the abutting end 12 by rotating the pressure member 3.

[0027] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore, all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within this utility model.

Claims

1. A sensing unit, characterized in that, include: The pressure end (11) and the object-abutting end (12) are provided. The pressure end (11) extends toward the object-abutting end (12) and is fixedly connected to it to form at least one strain zone (13). The strain zone (13) is provided with a strain gauge (132). The strain gauge (132) is connected to a signal conversion device (133) through a signal line. When a force is applied to the pressure end (11) in the direction toward the object-abutting end (12), the surface of the strain zone (13) deforms. The signal conversion device (133) converts the deformation of the strain zone (13) into a strain signal.

2. The sensing unit according to claim 1, characterized in that: The strain zone (13) includes at least one support (131), and the strain gauge (132) is disposed on the outer surface of the support (131).

3. A sensing unit according to claim 2, characterized in that: The pressure-bearing end (11), the object-abutting end (12), and the support member (131) are constructed as an integral structure, and the support member (131) forms an arc transition with the pressure-bearing end (11) and the object-abutting end (12) respectively.

4. A sensing unit according to claim 1, characterized in that: The pressure-bearing end (11) and the object-abutting end (12) are coaxially arranged. The pressure-bearing end (11) is used to withstand the force exerted by the pressure-applying component (3) on the sensing unit (1).

5. A sensing unit according to claim 1, characterized in that: The orthographic projection of the strain gauge (132) on the abutment end (12) falls completely within the orthographic projection area of ​​the pressure bearing end (11) on the upper surface of the abutment end (12).

6. A strain sensor, comprising a sensing unit as described in any one of claims 1-5, characterized in that, Also includes: The housing (21) located outside the sensing unit (1) has a through hole (211) extending vertically. At least one end of the pressure-bearing end (11) and the object-abutting end (12) is inserted into the through hole (211) and fixedly connected to the housing (21).

7. The strain sensor according to claim 6, characterized in that: A pressure-bearing component (4) is provided above the pressure-bearing end (11). A groove (41) is provided at the upper end of the pressure-bearing component (4). When pressure is applied to the pressure-bearing end (11), the pressure-applying component (3) that applies force to the sensing unit (1) penetrates the groove (41) and abuts against the inner bottom wall of the groove (41).

8. The strain sensor according to claim 7, characterized in that: The bottom area of ​​the pressure-bearing component (4) is larger than the area of ​​the upper surface of the pressure-bearing end (11).

9. The strain sensor according to claim 6, characterized in that: A display (5) is fixedly connected to one side wall of the housing (21), and the signal conversion device (133) is fixedly connected between the housing (21) and the display (5).

10. The strain sensor according to claim 6, characterized in that: The housing (21) has a cavity that communicates with the through hole (211), and a power supply device (6) is provided in the cavity. The power supply device (6) provides power to the signal conversion device (133).

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