Non-contact torsion sensor
By designing a non-contact torque sensor using wireless power supply and wireless signal transmission technology, the problems of rough torque setting of existing power tools and high cost of high-end power tools are solved, precise torque control and recording are achieved, cost reduction and filling the gap in the household power tool industry.
Patent Information
- Application Number
- CN202421385450.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-17
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-06-17
AI Technical Summary
The torque setting of existing power tools is rough, unable to achieve precise torque control and recording, and high-end power tools with torque function are expensive, limiting their application in the home power tool industry.
A non-contact torque sensor is designed, adopting wireless power supply and wireless signal transmission technology, combining bracket and coil shaping to ensure uniform sensor gaps, reduce signal noise, and achieve high integration through coaxial arrangement of the stator and rotor.
It improves sensor life and measurement accuracy, achieves precise torque control and recording, reduces the cost of power tools, and fills the gap in high-precision torque tools in the home power tool industry.
Smart Images
Figure CN222761775U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electric tool sensors, in particular to a non-contact torque sensor. Background Art
[0002] A non-contact torque sensor is a device used to measure the torsional torque of an object. It monitors the changes in torque in real time without direct contact with the object.
[0003] With the development of society, electric tools have been widely used in production and life, greatly improving social productivity and accelerating social development. Existing electric tools are often relatively simple, with only components such as motors and deceleration structures, relying on spring mechanical structures to achieve torque control, and relying on current sampling to achieve motor and maximum torque protection. Therefore, its torque setting is relatively rough and cannot achieve accurate torque control and recording. High-end electric tools with torque functions are often used in large factories such as automobile production lines. Their complex functions and high costs greatly limit their use scenarios. Therefore, there are many gaps in the household electric tool industry, lacking a simple, effective and reliable high-precision electric torque tool. Therefore, a non-contact torque sensor is proposed to solve the above problems. Utility Model Content
[0004] In view of the deficiencies of the prior art, the utility model provides a non-contact torque sensor, which has the advantages of using wireless power supply and wireless signal transmission technology, using a bracket and shaping the coil to ensure uniform sensor gap, greatly improving sensor life while reducing signal noise, etc., and solves the problem that electric tools are often relatively simple, with only components such as motors and deceleration structures, relying on spring mechanical structures to achieve torque control, and relying on current sampling to achieve motor and maximum torque protection. Therefore, its torque setting is relatively rough and cannot achieve accurate torque control and recording. High-end electric tools with torque functions are often used in large factories such as automobile production lines. They have complex functions and high costs, which greatly limit their use scenarios. Therefore, there are many gaps in the household electric tool industry, lacking a simple, effective and reliable high-precision electric torque tool.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a non-contact torque sensor, comprising an elastomer, an inductor and a signal processing unit, the signal processing unit comprising a stator sleeved on the left outer wall of the elastomer and a rotor sleeved on the outer side of the elastomer close to the stator, the stator and the rotor are coaxially arranged and can rotate with each other, the rotor is fixed on the elastomer, the stator and the rotor are arranged at intervals, the inductor is arranged on the surface of the elastomer and is electrically connected to the stator, a stator bracket is sleeved on the outer side of the stator, a first bearing is sleeved on the outer side of the elastomer, a rotor bracket is sleeved on the outer side of the rotor, a second bearing is sleeved on the left side of the rotor bracket, a stator coil bracket is fixedly connected to the left side of the stator, a rotor coil bracket is fixedly connected to the right side of the rotor, stator coils are fixed to the inner wall of the stator, a rotor coil is fixed to the inner wall of the rotor, a stator magnetic insulation material is fixedly connected between the stator and the stator coil, and a rotor magnetic insulation material is fixedly connected between the rotor and the rotor coil.
[0006] Furthermore, the stator and the rotor are coaxially arranged in parallel or coaxially sleeved, and a gap is provided between the stator and the rotor.
[0007] Furthermore, the gap between the stator and the rotor is 0.5 to 50 mm, and the elastic body is a shaft body, and the elastic body is rotatably fixed on the bracket.
[0008] Furthermore, the elastomer is connected to the bracket by means of a first bearing, the stator and the rotor of the signal processing unit are both fixed with a circuit bracket, the stator and the rotor of the signal processing unit are provided with a coil, the coil is a flat structure, and the coil is fitted with the circuit bracket.
[0009] Furthermore, the stator and rotor of the signal processing unit transmit and receive signals by means of Bluetooth, infrared, NFC, frequency modulation and amplitude modulation, and magnetic isolation material is arranged between the stator and rotor coils of the signal processing unit.
[0010] Furthermore, the stator and the rotor of the signal processing unit are provided with signal output terminals.
[0011] Furthermore, the signal output terminal outputs an analog signal or a serial port digital signal or a single bus digital signal.
[0012] Compared with the prior art, the present invention provides a non-contact torque sensor having the following features:
[0013] Beneficial effects:
[0014] 1. The non-contact torque sensor uses wireless power supply and wireless signal transmission technology to improve the sensor life, and uses a bracket and coil shaping to ensure uniform sensor gap and reduce signal noise.
[0015] 2. The non-contact torque sensor uses a planar coil to reduce the axial size and improve the integration of the sensor, solving the problem that power tools are often simple, with only components such as motors and deceleration structures, relying on spring mechanical structures to achieve torque control, and relying on current sampling to achieve motor and maximum torque protection. Therefore, its torque setting is relatively rough and cannot achieve accurate torque control and recording. High-end power tools with torque functions are often used in large factories such as automobile production lines. Their complex functions and high costs greatly limit their use scenarios. Therefore, there are many gaps in the household power tool industry, lacking a simple, effective and reliable high-precision electric torque tool. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is an exploded view of the three-dimensional structure of the torque sensor of the utility model;
[0017] Figure 2 It is a structural schematic diagram of the application of the central shaft torque sensor of the utility model.
[0018] In the figure: 1 elastomer, 2 inductor, 3 stator, 4 rotor, 5 stator bracket, 6 rotor bracket, 7 stator coil bracket, 8 rotor coil bracket, 9 first bearing, 10 second bearing, 11 rotor magnetic isolation material, 12 stator magnetic isolation material, 13 rotor coil, 14 stator coil. DETAILED DESCRIPTION
[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0020] See also Figures 1 to 2A non-contact torque sensor in this embodiment includes an elastic body 1, a sensor 2 and a signal processing unit. The signal processing unit includes a stator 3 sleeved on the left outer wall of the elastic body 1 and a rotor 4 sleeved on the outer side of the elastic body 1 near the stator 3. The stator 3 and the rotor 4 are coaxially arranged and can rotate with each other. The rotor 4 is fixed on the elastic body 1, and the stator 3 and the rotor 4 are arranged at intervals. The sensor 2 is arranged on the surface of the elastic body 1 and is electrically connected to the stator 3. A stator bracket 5 is sleeved on the outer side of the stator 3, a first bearing 9 is sleeved on the outer side of the elastic body 1, a rotor bracket 6 is sleeved on the outer side of the rotor 4, and a second bearing 10 is sleeved on the left side of the rotor bracket 6. A stator coil bracket 7 is fixedly connected to the left side of the stator 3, and a rotor coil bracket 8 is fixedly connected to the right side of the rotor 4. Stator coils 14 are fixed to the inner wall of the stator 3, and a rotor coil 13 is fixed to the inner wall of the rotor 4. A stator magnetic isolation material 12 is fixedly connected between the stator 3 and the stator coil 14, and a rotor magnetic isolation material 11 is fixedly connected between the rotor 4 and the rotor coil 13.
[0021] Among them, the stator 3 and the rotor 4 are arranged coaxially and in parallel or coaxially and sleeved, a gap is set between the stator 3 and the rotor 4, the gap between the stator 3 and the rotor 4 is 0.5 to 50 mm, the elastomer 1 is an axis, the elastomer 1 is rotatably fixed on the bracket, the elastomer 1 and the bracket are connected by a first bearing 9, the stator 3 and the rotor 4 of the signal processing unit are fixed with a line bracket, the stator 3 and the rotor 4 of the signal processing unit are provided with a coil, the coil is a flat structure, the coil and the line bracket are fitted together, the stator 3 and the rotor 4 of the signal processing unit receive and send signals by Bluetooth, infrared, NFC, frequency modulation and amplitude modulation, a magnetic isolation material is set between the coils of the stator 3 and the rotor 4 of the signal processing unit, the stator 3 and the rotor 4 of the signal processing unit are provided with a signal output terminal, and the output signal of the signal output terminal is an analog signal, a serial digital signal or a single bus digital signal.
[0022] It should be noted that the sensor 2 is a strain gauge, and the signal processing unit is a stator 3 and a rotor 4 that are separately arranged and can rotate relative to each other. The stator 3 and the rotor 4 of the signal processing unit are coaxially arranged and sleeved on the elastic body 1 of the axial structure. The stator 3 of the signal processing unit is fixedly connected to the bracket or the shell, and the stator 3 and the rotor 4 of the signal processing unit are coaxially arranged in parallel, and a gap is provided between the stator 3 and the rotor 4. Of course, in addition to the above-mentioned parallel arrangement of the stator 3 and the rotor 4, the stator 3 and the rotor 4 can also be coaxially sleeved and arranged, and a gap is provided between the stator 3 and the rotor 4 to ensure that the shape of the coil is complete and the gap between the coils is uniform. In order to reduce the influence of electromagnetic interference on the measurement accuracy, two groups of magnetic isolation materials are provided, wherein a stator magnetic isolation material 12 is provided between the stator 3 and the stator coil 14, and a rotor magnetic isolation material 11 is provided between the rotor 4 and the rotor coil 13. The magnetic isolation material can effectively shield electromagnetic waves and improve the measurement accuracy. The strain gauge is installed in a direction perpendicular to the plane where the coils of the stator 3 and rotor 4 of the signal processing unit are located to avoid the electromagnetic field of the coil generating an induced electrical signal in the strain gauge and reducing the sensor accuracy. The stator 3 and rotor 4 of the signal processing unit are provided with a signal output terminal. When Bluetooth is used to transmit signals, the signal output terminal is Bluetooth and can be set on the stator 3 or rotor 4 of the signal processing unit. When the signal output terminal outputs a wired analog signal, a serial port digital signal or a single bus digital signal, the signal output terminal output is set on the rotor 4 of the signal processing unit.
[0023] In addition, in order to reduce the interference of the coil transmission and reception on the circuit board, a magnetic isolation material is set between the circuit board and the coil. The magnetic isolation material can be selected according to the installation method of the coil. Flat bonding or coaxial sleeve connection
[0024] The working principle of the above embodiment is:
[0025] The rotor 4 of the signal processing unit is arranged close to the strain gauge and is fixed on the elastomer 1 by means of a rotor bracket 6 and moves with the elastomer 1. The output of the strain gauge is electrically connected to the rotor 4 of the signal processing unit. The sensor 2 can also be made of magnetostrictive material. The transmitting coil of the stator 3 of the signal processing unit and the receiving coil of the rotor 4 of the signal processing unit are used to realize wireless power supply of the sensor. The stator 3 and the rotor 4 of the signal processing unit transmit signals by infrared. The stator 3 of the signal processing unit is provided with an infrared receiver, and the rotor 4 of the signal processing unit is provided with an infrared transmitting tube. The infrared transmission method can use Bluetooth, NFC, frequency modulation, amplitude modulation and coil modulation to send and receive signals. When using the coil modulation method for transmission, an additional coil needs to be provided for transmitting the signal. The distance between the stator 3 and the rotor 4 of the signal processing unit changes by no more than 0.5 mm during the rotation process to reduce the interference of the electromagnetic field on signal acquisition and improve the sampling and sensor accuracy.
[0026] The electrical components appearing in the article are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device for control such as a computer, and the existing public power connection technology is not described in detail in the article.
[0027] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A non-contact torque sensor, comprising an elastic body (1), a sensor (2) and a signal processing unit, characterized in that: The signal processing unit comprises a stator (3) sleeved on the left outer wall of the elastic body (1) and a rotor (4) sleeved on the outer side of the elastic body (1) close to the stator (3), the stator (3) and the rotor (4) are coaxially arranged and can rotate relative to each other, the rotor (4) is fixed on the elastic body (1), the stator (3) and the rotor (4) are arranged at intervals, the sensor (2) is arranged on the surface of the elastic body (1) and is electrically connected to the stator (3), the stator (3) is sleeved on the outer side of the stator bracket (5), the elastic body (1) is sleeved on the outer side of the first bearing (9), and the rotor (4) is arranged on the outer side of the stator bracket (5). (4) A rotor support (6) is sleeved on the outer side, a second bearing (10) is sleeved on the left side of the rotor support (6), a stator coil support (7) is fixedly connected to the left side of the stator (3), a rotor coil support (8) is fixedly connected to the right side of the rotor (4), a stator coil (14) is fixedly connected to the inner wall of the stator (3), a rotor coil (13) is fixedly connected to the inner wall of the rotor (4), a stator magnetic insulation material (12) is fixedly connected between the stator (3) and the stator coil (14), and a rotor magnetic insulation material (11) is fixedly connected between the rotor (4) and the rotor coil (13).
2. A non-contact torque sensor according to claim 1, characterized in that: The stator (3) and the rotor (4) are coaxially arranged in parallel or coaxially sleeved, and a gap is provided between the stator (3) and the rotor (4).
3. A non-contact torque sensor according to claim 1, characterized in that: The gap between the stator (3) and the rotor (4) is 0.5 to 50 mm, the elastic body (1) is an axle body, and the elastic body (1) is rotatably fixed on the bracket.
4. The non-contact torque sensor according to claim 1, characterized in that: The elastic body (1) is connected to the bracket by means of a first bearing (9); the stator (3) and the rotor (4) of the signal processing unit are both fixed with a circuit bracket; the stator (3) and the rotor (4) of the signal processing unit are provided with a coil; the coil is a flat structure; and the coil is arranged in close contact with the circuit bracket.
5. The non-contact torque sensor according to claim 1, characterized in that: The stator (3) and the rotor (4) of the signal processing unit transmit and receive signals by means of Bluetooth, infrared, NFC, frequency modulation and amplitude modulation, and magnetic isolation material is provided between the coils of the stator (3) and the rotor (4) of the signal processing unit.
6. The non-contact torque sensor according to claim 1, characterized in that: The stator (3) and the rotor (4) of the signal processing unit are provided with signal output ends.
7. A non-contact torque sensor according to claim 6, characterized in that: The output signal of the signal output terminal is an analog signal, a serial port digital signal or a single bus digital signal.