Integrated displacement dynamometer

Abstract

The present invention provides a combined displacement dynamometer, comprising: an outer ring, a pressure head, a magnet, a magnetic detection element and a strain gauge, wherein the pressure head is connected to the outer ring in the circumference through a plurality of strain beams, the pressure head is arranged in the hollow area surrounded by the outer ring, the magnetic detection element is installed on the back of the pressure head, the magnet is connected to the outer ring, and the magnet is located in the hollow area and arranged on the side where the magnetic detection element is located, and the strain gauge is arranged on the strain beam. The present invention integrates the detection of displacement and force to form an integrated displacement dynamometer, which can detect displacement and force at the same time, so that the force value of the sensor can be compensated through the linear relationship between displacement and force value, thereby making the accuracy of the sensor output higher.

Description

Technical Field

[0001] The present invention relates to the technical field of sensors, and in particular to a combined displacement dynamometer. Background Art

[0002] For some traditional mobile phone screen detection equipment, due to the particularity of the equipment, the sensor detection accuracy must be high, the volume must be small, and its deformation must be small. Traditionally, a standard pressure sensor is generally used with a standard displacement sensor. Through two different types of sensors, the force value detection and flatness detection of the mobile phone screen are completed. This model not only greatly increases the cost of the equipment, but also requires a larger space to install the pressure sensor and displacement sensor, and the system accuracy is relatively poor. Summary of the invention

[0003] The present invention provides a combined displacement dynamometer to solve at least one of the above technical problems.

[0004] To solve the above problems, as one aspect of the present invention, a combined displacement dynamometer is provided, comprising: an outer ring, a pressure head, a magnet, a magnetic detection element and a strain gauge, wherein the pressure head is circumferentially connected to the outer ring through a plurality of strain beams, the pressure head is arranged in a hollow area surrounded by the outer ring, the magnetic detection element is mounted on the back of the pressure head, the magnet is connected to the outer ring, and the magnet is located in the hollow area and arranged on the side where the magnetic detection element is located, and the strain gauge is arranged on the strain beam.

[0005] Preferably, an auxiliary beam is protrudingly formed on the inner wall of the outer ring, and the magnet is mounted on the auxiliary beam.

[0006] Preferably, the magnet is mounted on the auxiliary beam via a magnet fixing block.

[0007] Preferably, the magnet fixing block comprises a body, a mounting hole connected to a screw hole on the auxiliary beam is formed on the body, and a mounting groove for mounting the magnet is formed on the body.

[0008] Preferably, the combined displacement dynamometer comprises two magnets which are symmetrically arranged relative to the center of the outer ring.

[0009] Preferably, the combined displacement dynamometer further comprises a circuit board, the magnetic detection element is arranged on the circuit board, and the circuit board is mounted on the back side by fasteners.

[0010] Preferably, the combined displacement dynamometer also includes an annular upper cover plate and a circular lower cover plate, the upper cover plate is connected to the opening on the first side of the outer ring, and the end of the pressure head protrudes from the opening of the upper cover plate, and the lower cover plate is connected to the opening on the second side of the outer ring.

[0011] Preferably, a plurality of fixing screw holes are provided in the circumference of the outer ring.

[0012] Preferably, an aviation plug is installed on the outer side wall of the outer ring, and the aviation plug is connected to the magnetic detection element and the strain gauge.

[0013] Preferably, the magnetic detection element is a Hall element.

[0014] Through the above technical scheme, the present invention integrates the detection of displacement and force to form an integrated displacement dynamometer, which can detect displacement and force at the same time, so that the force value of the sensor can be compensated through the linear relationship between displacement and force value, thereby making the sensor output more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematically shows a top view of the present invention;

[0016] Figure 2 Schematically shows Figure 1 AA section view;

[0017] Figure 3 Schematically shows a front view of the present invention;

[0018] Figure 4 A perspective view of the present invention is schematically shown;

[0019] Figure 5 Schematically shows an exploded view of the present invention;

[0020] Figure 6 Schematically shows an exploded view of the present invention;

[0021] Figure 7 A perspective view of a magnet fixing block is schematically shown;

[0022] Figure 8 A perspective view of a magnet fixing block is schematically shown.

[0023] The reference numerals in the figure are: 1. outer ring; 2. pressure head; 3. magnet; 4. magnetic detection element; 5. strain gauge; 6. strain beam; 7. auxiliary beam; 8. magnet fixing block; 9. mounting hole; 10. circuit board; 11. upper cover plate; 12. lower cover plate; 13. fixing screw hole; 14. aviation plug. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0025] One aspect of the present invention provides a combined displacement dynamometer, specifically a new type of combined sensor that can measure displacement and force simultaneously and compensate for force through displacement. The combined sensor is mainly used in the 3C industry, mobile phone screen detection, various presses and various automated equipment that require simultaneous detection of force and small-range displacement deformation.

[0026] The combined displacement dynamometer includes: an outer ring 1, a pressure head 2, a magnet 3, a magnetic detection element 4 and a strain gauge 5. The pressure head 2 is circumferentially connected to the outer ring 1 through a plurality of strain beams 6. The pressure head 2 is arranged in a hollow area surrounded by the outer ring 1. The magnetic detection element 4 is installed on the back of the pressure head 2. The magnet 3 is connected to the outer ring 1, and the magnet 3 is located in the hollow area and arranged on the side where the magnetic detection element 4 is located. The strain gauge 5 is arranged on the strain beam 6.

[0027] The strain beam adopts a shear beam structure. A strain gauge is attached to each strain beam. The strain beam is deformed by force, which affects the resistance change of the strain gauge. The Wheatstone bridge composed of the strain gauges is used to obtain an electrical signal output proportional to the deformation or force value.

[0028] The two magnets 3 are relatively fixed, and the bottom surface of the pressure head 2 is connected to a magnetic detection element 4. When the pressure head 2 is subjected to a force, it will produce a small downward deformation. At this time, the magnetic detection element 4 moves vertically relative to the magnetic field between the two relatively fixed magnets 3. Due to the Hall effect, an electric potential difference is generated in two directions perpendicular to the conductor and the magnetic flux lines. Therefore, a voltage or current signal can be output through a relatively simple circuit connection designed at the back end, thereby corresponding to the displacement deformation, a displacement signal can be output.

[0029] Since the corresponding deformation amount of the sensor is different when it is subjected to pressures of different magnitudes, and the force is proportional to the deformation amount, therefore, when the present invention is subjected to different pressures, its deformation amount (displacement) is also different.

[0030] Through the above technical scheme, the present invention integrates the detection of displacement and force to form an integrated displacement dynamometer, which can detect displacement and force at the same time, so that the force value of the sensor can be compensated through the linear relationship between displacement and force value, thereby making the sensor output more accurate.

[0031] Preferably, an auxiliary beam 7 is protrudingly formed on the inner wall of the outer ring 1, and the magnet 3 is mounted on the auxiliary beam 7. Preferably, the magnet 3 is mounted on the auxiliary beam 7 through a magnet fixing block 8. The auxiliary beam 7 is used to install and fix the magnet fixing block 8.

[0032] Preferably, the magnet fixing block 8 comprises a main body, a mounting hole 9 connected to a screw hole on the auxiliary beam 7 is formed on the main body, and a mounting groove for mounting the magnet 3 is formed on the main body.

[0033] Preferably, the combined displacement dynamometer comprises two magnets 3 which are symmetrically arranged relative to the center of the outer ring 1 .

[0034] Preferably, the combined displacement dynamometer further comprises a circuit board 10, the magnetic detection element 4 is arranged on the circuit board 10, and the circuit board 10 is mounted on the back side by fasteners.

[0035] Preferably, the combined displacement dynamometer also includes an annular upper cover plate 11 and a circular lower cover plate 12, the upper cover plate 11 is connected to the opening of the first side of the outer ring 1, and the end of the pressure head 2 protrudes from the opening of the upper cover plate 11, and the lower cover plate 12 is connected to the opening of the second side of the outer ring 1.

[0036] Preferably, a plurality of fixing screw holes 13 are provided in the circumferential direction of the outer ring 1 .

[0037] Preferably, an aviation plug 14 for connecting to an external device is installed on the outer side wall of the outer ring 1 , and the aviation plug 14 is connected to the magnetic detection element 4 and the strain gauge 5 .

[0038] Preferably, the magnetic detection element 4 is a Hall element.

[0039] The present invention is not only small in size and easy to install (installed in six screw holes), but also can output pressure signals and displacement signals at the same time through the internal circuit, and can use it to output the displacement in real time to control the motor to adjust the precision screw to move the corresponding displacement, to compensate for the error caused by the deformation of the sensor, so that the force value accuracy of the sensor output is greatly improved, and the equipment cost is greatly saved.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An integrated combined displacement dynamometer, characterized in that: include: An outer ring (1), a pressure head (2), a magnet (3), a magnetic detection element (4) and a strain gauge (5), wherein the pressure head (2) is connected to the outer ring (1) in the circumferential direction via a plurality of strain beams (6), the pressure head (2) is arranged in a hollow area surrounded by the outer ring (1), the magnetic detection element (4) is mounted on the back of the pressure head (2), the magnet (3) is connected to the outer ring (1), and the magnet (3) is located in the hollow area and arranged on the side where the magnetic detection element (4) is located, the strain gauge (5) is arranged on the strain beam (6), and the integrated combined displacement dynamometer detects displacement and force simultaneously, so that the force value of the sensor can be compensated through the linear relationship between the displacement and the force value, so that the accuracy of the sensor output is higher.

2. The integrated combined displacement dynamometer according to claim 1, characterized in that: An auxiliary beam (7) is protrudingly formed on the inner wall of the outer ring (1), and the magnet (3) is mounted on the auxiliary beam (7).

3. The integrated combined displacement dynamometer according to claim 2, characterized in that: The magnet (3) is mounted on the auxiliary beam (7) via a magnet fixing block (8).

4. The integrated combined displacement dynamometer according to claim 3, characterized in that: The magnet fixing block (8) comprises a main body, the main body is provided with a mounting hole (9) connected to a screw hole on the auxiliary beam (7), and the main body is formed with a mounting groove for mounting the magnet (3).

5. The integrated combined displacement dynamometer according to claim 3, characterized in that: The combined displacement dynamometer comprises two magnets (3) which are symmetrically arranged relative to the center of the outer ring (1).

6. The integrated combined displacement dynamometer according to claim 1, characterized in that: The combined displacement dynamometer further comprises a circuit board (10), the magnetic detection element (4) is arranged on the circuit board (10), and the circuit board (10) is mounted on the back side via a fastener.

7. The integrated combined displacement dynamometer according to claim 1, characterized in that: The combined displacement dynamometer further comprises an annular upper cover plate (11) and a circular lower cover plate (12); the upper cover plate (11) is connected to an opening on a first side of the outer ring (1), and an end of the pressure head (2) protrudes from the opening of the upper cover plate (11); and the lower cover plate (12) is connected to an opening on a second side of the outer ring (1).

8. The integrated combined displacement dynamometer according to claim 1, characterized in that: The outer ring (1) is provided with a plurality of fixing screw holes (13) in the circumferential direction.

9. The integrated combined displacement dynamometer according to claim 1, characterized in that: An aviation plug (14) is installed on the outer side wall of the outer ring (1), and the aviation plug (14) is connected to the magnetic detection element (4) and the strain gauge (5).

10. The integrated combined displacement dynamometer according to claim 1, characterized in that: The magnetic detection element (4) is a Hall element.

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