CN112414434A - Built-in angular displacement sensor with adjustable torque - Google Patents

Built-in angular displacement sensor with adjustable torque Download PDF

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Publication number
CN112414434A
CN112414434A CN202011406754.9A CN202011406754A CN112414434A CN 112414434 A CN112414434 A CN 112414434A CN 202011406754 A CN202011406754 A CN 202011406754A CN 112414434 A CN112414434 A CN 112414434A
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CN
China
Prior art keywords
shell
displacement sensor
angular displacement
rotating shaft
elastic washer
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011406754.9A
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Chinese (zh)
Inventor
吴永胜
郭刚
唐飞
于四辉
谢平
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Chengdu Hongming Electronics Co Ltd
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Chengdu Hongming Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Chengdu Hongming Electronics Co Ltd filed Critical Chengdu Hongming Electronics Co Ltd
Priority to CN202011406754.9A priority Critical patent/CN112414434A/en
Publication of CN112414434A publication Critical patent/CN112414434A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/02—Vibration-dampers; Shock-absorbers with relatively-rotatable friction surfaces that are pressed together
    • F16F7/023—Vibration-dampers; Shock-absorbers with relatively-rotatable friction surfaces that are pressed together and characterised by damping force adjustment means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/25—Selecting one or more conductors or channels from a plurality of conductors or channels, e.g. by closing contacts

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

The invention discloses a built-in angular displacement sensor with adjustable torque, wherein the inner end of a transverse rotating shaft penetrates through a through hole at the front end of a shell from outside to inside and then is connected with a collector ring assembly, an elastic washer and an adjusting nut which are sequentially sleeved on the rotating shaft from front to back are arranged in an inner cavity of the shell and are positioned between the inner wall of the front end of the shell and the collector ring assembly, the adjusting nut is connected with the rotating shaft through threads, the front end of the elastic washer is in surface contact with the surface of the vertical inner wall at the front end of the shell, and the rear end of the elastic washer is in surface contact with the surface of the front. The invention uses the adjusting nut to push the elastic washer to move forwards to compress or move backwards to extend by installing the elastic washer and the adjusting nut on the rotating shaft, thereby changing the friction force at the front end and the rear end of the elastic washer, changing the rotating resistance of the rotating shaft, realizing the adjustment control of the rotating torque (including the starting torque) of the angular displacement sensor, and being suitable for the application occasions with the adjustment control requirements on the rotating torque.

Description

Built-in angular displacement sensor with adjustable torque
Technical Field
The invention relates to an angular displacement sensor, in particular to a built-in angular displacement sensor with adjustable rotation torque (including starting torque).
Background
With the development of science and technology, the angular displacement sensor is used as an angle and position detection mechanism to realize the conversion from mechanical motion to electrical signals, and is widely applied to complete machines, precision instruments and meters and the like of industries, ships, aviation, aerospace and the like which have higher technical indexes and various harsh test requirements on high precision and long service life. In high-demand applications, requirements for rotation torque (including starting torque) adjustment, rotation angle limitation and the like of the rotating shaft are provided.
The conventional angular displacement sensor has the following defects:
the traditional angular displacement sensor has no structure for adjusting and controlling the rotating torque, the rotating torque distribution is random, and the rotating torque distribution cannot be changed and controlled in practical application, so that the traditional angular displacement sensor is not suitable for application occasions with adjusting and controlling requirements on the rotating torque.
The traditional angular displacement sensor has no structure for limiting the rotation angle of the rotating shaft, generally has a 360-degree rotation range, namely, has no angle limitation, and is very likely to cause the problem that a circuit or a structure is damaged due to the fact that the angle exceeds 360 degrees, so that the traditional angular displacement sensor is not suitable for application occasions with limited rotation angle limiting control requirements.
In addition, the conventional angular displacement sensor generally only has one resistor body and one set of collector ring assembly, and if a fault occurs, the conventional angular displacement sensor cannot normally work, so that the reliability is not high enough, and the conventional angular displacement sensor is not suitable for application occasions with high requirements on the diagonal displacement detection reliability.
Disclosure of Invention
The present invention aims to solve the above problems by providing a built-in angular displacement sensor with adjustable torque.
The invention realizes the purpose through the following technical scheme:
a built-in angular displacement sensor with adjustable torque comprises a rotating shaft, a shell, a cover plate, a resistor body and a collector ring assembly, wherein the resistor body and the collector ring assembly are arranged in inner cavities of the shell and the cover plate, the inner end of the rotating shaft which is transverse penetrates through a through hole in the front end of the shell from outside to inside and then is connected with the collector ring assembly, the front end of the cover plate is connected with the rear end of the shell, the built-in angular displacement sensor with adjustable torque further comprises an elastic washer and an adjusting nut, the elastic washer and the adjusting nut are both arranged in the inner cavity of the shell and are positioned between the inner wall of the front end of the shell and the collector ring assembly, the elastic washer and the adjusting nut are sequentially sleeved on the rotating shaft from front to back, the adjusting nut is connected with the rotating shaft through threads, the peripheral edge of the elastic washer and the central hole wall are not in the same plane and respectively form a front end, the front end of the elastic washer is in surface contact with the vertical inner wall of the front end of the shell, and the rear end of the elastic washer is in surface contact with the front end of the adjusting nut.
In the structure, the elastic washer and the adjusting nut are innovative structures of the invention, the elastic washer can be made of thin steel sheets and other materials, has elasticity, is compressed when pushed forwards by the adjusting nut, the elasticity is increased, the pressure and the friction force on the adjusting nut and the inner wall of the shell are increased, the resistance on the rotating shaft when the rotating shaft starts to rotate and in the rotating process is increased, namely the starting torque and the rotating torque of the angular displacement sensor are increased; on the contrary, after the adjusting nut moves backwards, the elastic washer extends backwards under the action of the elasticity of the elastic washer, the elasticity of the elastic washer is reduced, the pressure and the friction force on the inner wall of the adjusting nut and the shell are reduced, the resistance on the rotating shaft when the rotating shaft starts to rotate and in the rotating process is reduced, namely the starting torque and the rotating torque of the angular displacement sensor are reduced; because the adjusting nut is connected with the rotating shaft through the threads, a user can move the adjusting nut forwards or backwards by rotating the adjusting nut, and therefore the purpose of adjusting the rotating torque (including the starting torque) of the angular displacement sensor is achieved.
Preferably, in order to limit and adjust the rotation angle of the rotating shaft, the built-in angular displacement sensor with adjustable torque further comprises a limit pin, a circular groove which is recessed forwards is formed in a region, located within the elastic washer, of the vertical inner wall of the front end of the shell, the limit pin is mounted on the rotating shaft and is arranged in the circular groove, a first end of the limit pin is arranged outside the rotating shaft, a limit bump which protrudes towards the center direction of the circular groove is arranged on the circumferential groove wall of the circular groove, and the limit pin and the limit bump meet the following conditions: when the first end of the limiting pin rotates to the position of the limiting lug, the first end of the limiting pin can be blocked by the limiting lug, and when the second end of the limiting pin rotates to the position of the limiting lug, the second end of the limiting pin cannot be blocked by the limiting lug. The limiting convex block enables the limiting pin not to rotate plus the rotating angle occupied by the limiting pin to be the stop angle of the angular displacement sensor, the stop angle subtracted by 360 degrees is the rotating angle of the angular displacement sensor, and the rotating angle and the control precision of the angular displacement sensor can be controlled by controlling the size of the limiting pin and the size and the precision of the limiting convex block.
Preferably, in order to improve the limiting stability and the control precision of the rotation angle of the angular displacement sensor, an included angle is formed between two linear surfaces of the limiting convex block, which are in contact with the limiting pin, and the included angle satisfies the following conditions: the limiting convex block is in line contact or surface contact with the limiting pin when in contact.
Preferably, the elastic washer has a radial cross section in a convex shape in order to improve elasticity and life of the elastic washer.
Preferably, in order to facilitate the angular displacement sensor to be quickly and accurately mounted on other equipment, the front end of the shell is provided with a small-diameter cylindrical section with a reduced diameter, the small-diameter cylindrical section is provided with an external thread and is sleeved with a mounting nut, and a positioning pin for positioning and mounting the angular displacement sensor is mounted on a vertical outer wall of the shell, which is located on the rear side of the small-diameter cylindrical section.
Preferably, the dowel pins are bonded to the housing to facilitate quick assembly and disassembly of the dowel pins.
According to the practical application requirement, one resistor body and one current collecting ring assembly form a circuit assembly, and one or more circuit assemblies are installed in the shell and the cover plate.
Preferably, in order to meet the requirements of high precision and high reliability, reduce the size, save the cost and facilitate assembly, the number of the circuit assemblies is two, the two current collecting ring assemblies are sequentially sleeved on the rotating shaft from front to back, the rear end of the shell is connected with the front end of a middle shell with openings at the front and the back, the rear end of the middle shell is connected with the front end of the cover plate, the former circuit assembly is arranged in the middle shell, and the latter circuit assembly is arranged in the cover plate.
The invention has the beneficial effects that:
the elastic washer and the adjusting nut are arranged on the rotating shaft, and the adjusting nut is used for pushing the elastic washer to move forwards to compress or move backwards to extend the elastic washer, so that the friction force at the front end and the rear end of the elastic washer is changed, the rotating resistance of the rotating shaft is changed, the adjustment control of the rotating torque (including the starting torque) of the angular displacement sensor is realized, and the adjusting nut is suitable for application occasions with the adjustment control requirements on the rotating torque; the elastic washer and the adjusting nut are arranged in the shell, the cover plate needs to be opened when the rotating torque needs to be adjusted, the cover plate is slightly troublesome, but the whole appearance is attractive, and the mounting nut can be arranged at the front end of the shell, so that the sensor can be mounted quickly; the limiting pin and the limiting lug are arranged in the shell, so that the rotating shaft cannot rotate by 360 degrees, namely, the angle limiting function is realized, the problem of damage caused by the fact that the rotating shaft exceeds a limit position is avoided, and the rotating shaft limiting device is suitable for application occasions with limited rotating angle control requirements; through setting up two or more circuit assembly, even one of them circuit assembly damages still can normally work, has improved product reliability, is applicable to the application scenario that diagonal displacement detection reliability requires highly.
Drawings
FIG. 1 is one of the front cross-sectional views of the built-in torque-tunable angular displacement sensor of the present invention;
FIG. 2 is a schematic side view of an associated structure of a limit pin and a limit bump of the built-in angular displacement sensor with adjustable torque according to the present invention;
FIG. 3 is a second schematic side view of the related structure of the limit pin and the limit bump of the built-in angular displacement sensor with adjustable torque according to the present invention;
FIG. 4 is a third schematic diagram of a side view of an associated structure of a limit pin and a limit bump of the built-in angular displacement sensor with adjustable torque according to the present invention;
fig. 5 is a second front cross-sectional view of the built-in torque-adjustable angular displacement sensor of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
as shown in fig. 1 and 5, the built-in moment-adjustable angular displacement sensor of the present invention includes a rotating shaft 1, a housing 4, a cover plate 19, a resistive body (see a first resistive body 12 in fig. 1 and 5 and a second resistive body 22 in fig. 1), a current collecting ring assembly, an elastic washer 9 and an adjusting nut 10, wherein the resistive body and the current collecting ring assembly are installed in the inner cavities of the housing 4 and the cover plate 19, the inner ends (the rear end and the right end in the figures) of the transverse rotating shaft 1 penetrate through a through hole at the front end of the housing 4 from outside to inside (from front to back and from left to right in the figures) and are connected with the current collecting ring assembly, the front end of the cover plate 19 is connected with the rear end of the housing 4, the elastic washer 9 and the adjusting nut 10 are both placed in the inner cavity of the housing 4 and located between the inner wall at the front end of the housing 4 and the current collecting ring assembly, the adjusting nut 10 is connected with the rotating shaft 1 through threads, the peripheral edge of the elastic washer 9 and the central hole wall are not in the same plane and respectively form a front end and a rear end, the front end of the elastic washer 9 is in surface contact with the vertical inner wall of the front end of the shell 4, and the rear end of the elastic washer 9 is in surface contact with the front end of the adjusting nut 10.
Also shown in fig. 1 and 5 is a collar 5, of conventional construction, mounted on the shaft 1 and serving to retain the shaft 1.
As shown in fig. 1 and 5, the basic working principle of the built-in angular displacement sensor with adjustable torque of the present invention is as follows:
the rotating shaft 1 rotates to drive the collector ring assembly to rotate, and reeds of the collector ring assembly rotate on the working surface of the resistor body in a contact manner to complete the acquisition of electric signals; meanwhile, the rotating shaft 1 rotates to drive the adjusting nut 10 to rotate, and the resistance generated by the elastic washer 9 on the adjusting nut 10 is applied to the rotating shaft 1, so that the rotating torque of the rotating shaft 1 is changed due to the pressure of the adjusting nut 10 on the elastic washer 9; according to the actual required rotating moment, after a plurality of times of test adjustment, the adjusting nut 10 can be adjusted to the most appropriate position on the rotating shaft 1, so that the requirement of adjustable rotating moment (including starting moment) can be met.
As shown in fig. 1 to 5, the present invention also discloses a plurality of more optimized structures, and one or more structures can be combined with the above structures to form a more optimized technical solution according to actual needs.
In order to limit and adjust the rotation angle of the rotating shaft 1, the built-in angular displacement sensor with adjustable torque further comprises a limiting pin 8, a circular groove 6 which is inwards concave forwards is arranged in an area, located within an elastic gasket 9, on the vertical inner wall of the front end of the shell 4, the limiting pin 8 is installed on the rotating shaft 1 and is arranged in the circular groove 6, the first end of the limiting pin 8 is arranged outside the rotating shaft 1, a limiting lug 7 which is convex towards the center direction of the circular groove 6 is arranged on the circumferential groove wall of the circular groove 6, and the limiting pin 8 and the limiting lug 7 meet the following conditions: when the first end of the limit pin 8 rotates to the position of the limit bump 7, the first end can be blocked by the limit bump 7, and when the second end of the limit pin 8 rotates to the position of the limit bump 7, the second end cannot be blocked by the limit bump 7. When the device is used, the rotatable angle of the rotating shaft 1 is less than 360 degrees, and the specific rotatable angle calculation method is as follows: the limiting convex block 7 enables the limiting pin 8 not to rotate plus the rotating angle occupied by the limiting pin 8 to be the stop angle of the angular displacement sensor, the stop angle subtracted by 360 degrees is the rotating angle of the rotating shaft 1, and the rotating angle and the control precision of the angular displacement sensor can be controlled by controlling the size of the limiting pin 8 and the size and the precision of the limiting convex block 7. The relative relationship between the limit pin 8 and the limit bump 7 is shown in fig. 2-4, and the limit pin 8 in fig. 2 is not in contact with the limit bump 7, so that the rotation of the rotating shaft 1 is not influenced; the limiting pin 8 in fig. 3 contacts with one side of the limiting bump 7 to prevent the rotating shaft 1 from rotating counterclockwise; the limit pin 8 in fig. 4 contacts with the other side of the limit bump 7, and blocks the rotating shaft 1 from further rotating clockwise.
In order to improve the limiting stability and the control precision of the rotating angle of the angular displacement sensor, an included angle is formed between the two side linear surfaces of the limiting convex block 7, which are in contact with the limiting pin 8, and the included angle meets the following conditions: the limit lug 7 is in line contact or surface contact with the limit pin 8. Therefore, the two contact is more stable and reliable than point contact.
In order to improve the elasticity and life of the elastic washer 9, the radial cross section of the elastic washer 9 has a convex shape which is less likely to be compressed to lose elasticity than a concave shape.
In order to install the angular displacement sensor on other equipment quickly and accurately, the front end of the shell 4 is provided with a small-diameter cylindrical section with the diameter reduced, the small-diameter cylindrical section is provided with an external thread and is sleeved with an installation nut 2, and a positioning pin 3 used for positioning and installing the angular displacement sensor is installed on the vertical outer wall of the shell 4 on the rear side of the small-diameter cylindrical section. During installation, the small-diameter cylindrical section penetrates through installation holes in installation plates of other equipment, is positioned through the positioning pin 3, and then the installation nut 2 is screwed to complete installation.
In order to facilitate the quick assembly and disassembly of the positioning pin 3, the positioning pin 3 is bonded on the shell 4.
According to the actual application requirement, one resistor body and one current collecting ring assembly form a circuit assembly, and one or more circuit assemblies are arranged in the shell 4 and the cover plate 19. Two circuit elements are shown in fig. 1 and one circuit element is shown in fig. 5.
In order to meet the requirements of high precision and high reliability, reduce the size, save the cost and facilitate assembly, two circuit assemblies are provided, as shown in fig. 1, the two current collecting ring assemblies are sequentially sleeved on the rotating shaft 1 from front to back, the rear end of the shell 4 is connected with the front end of the middle shell 11 with openings at the front and the back, the rear end of the middle shell 11 is connected with the front end of the cover plate 19, the former circuit assembly is arranged in the middle shell 11, and the latter circuit assembly is arranged in the cover plate 19. Fig. 1 and 5 also show the first resistor body 12, the first sleeve 13, the first slip ring 14, the first lead 15, the first upper lead 16 and the first lower lead 17 of the first circuit assembly, and fig. 1 also shows the second resistor body 22, the second sleeve 18, the second slip ring 20, the second lead 24, the second upper lead 21 and the second lower lead 23 of the second circuit assembly, which are conventional structures.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, so long as the technical solutions can be realized on the basis of the above embodiments without creative efforts, which should be considered to fall within the protection scope of the patent of the present invention.

Claims (8)

1. A built-in angular displacement sensor with adjustable torque comprises a rotating shaft, a shell, a cover plate, a resistor body and a collector ring assembly, wherein the resistor body and the collector ring assembly are arranged in inner cavities of the shell and the cover plate, the inner end of the rotating shaft in the transverse direction penetrates through a through hole in the front end of the shell from outside to inside and then is connected with the collector ring assembly, and the front end of the cover plate is connected with the rear end of the shell, and the angular displacement sensor is characterized in that: the built-in angular displacement sensor with adjustable torque further comprises an elastic washer and an adjusting nut, wherein the elastic washer and the adjusting nut are arranged in the inner cavity of the shell and are positioned between the inner wall of the front end of the shell and the current collecting ring assembly, the elastic washer and the adjusting nut are sequentially sleeved on the rotating shaft from front to back, the adjusting nut is connected with the rotating shaft through threads, the peripheral edge and the central hole wall of the elastic washer are not in the same plane and respectively form a front end and a rear end, the front end of the elastic washer is in surface contact with the vertical inner wall of the front end of the shell, and the rear end of the elastic washer is in surface contact with the front end of the adjusting nut.
2. The built-in moment-adjustable angular displacement sensor of claim 1, wherein: the built-in angular displacement sensor with adjustable torque further comprises a limiting pin, a circular groove which is inwards concave forwards is arranged in an area, located within the elastic washer, on the vertical inner wall of the front end of the shell, the limiting pin is installed on the rotating shaft and is arranged in the circular groove, the first end of the limiting pin is arranged outside the rotating shaft, a limiting convex block which protrudes towards the center direction of the circular groove is arranged on the circumferential groove wall of the circular groove, and the limiting pin and the limiting convex block meet the following conditions: when the first end of the limiting pin rotates to the position of the limiting lug, the first end of the limiting pin can be blocked by the limiting lug, and when the second end of the limiting pin rotates to the position of the limiting lug, the second end of the limiting pin cannot be blocked by the limiting lug.
3. The built-in moment-adjustable angular displacement sensor of claim 2, wherein: the limiting convex block is used for forming an included angle between two side linear surfaces which are in contact with the limiting pin, and the included angle meets the following conditions: the limiting convex block is in line contact or surface contact with the limiting pin when in contact.
4. The built-in moment-adjustable angular displacement sensor of claim 1, 2 or 3, wherein: the radial section of the elastic washer is in an outward convex shape.
5. The built-in moment-adjustable angular displacement sensor of claim 1, 2 or 3, wherein: the front end of shell is equipped with the path cylinder section that the diameter reduces and be equipped with the external screw thread on this path cylinder section and the cover is equipped with mounting nut, be located on the shell the vertical outer wall of path cylinder section rear side is installed and is used for the location installation angle displacement sensor's locating pin.
6. The built-in moment-adjustable angular displacement sensor of claim 5, wherein: the locating pin is bonded to the housing.
7. The built-in moment-adjustable angular displacement sensor of claim 1, 2 or 3, wherein: one resistor body and one current collecting ring assembly form a circuit assembly, and one or more circuit assemblies are arranged in the shell and the cover plate.
8. The built-in moment-adjustable angular displacement sensor of claim 7, wherein: the two collecting ring assemblies are sequentially sleeved on the rotating shaft from front to back, the rear end of the shell is connected with the front end of a middle shell with openings at the front and the back, the rear end of the middle shell is connected with the front end of the cover plate, the former circuit assembly is arranged in the middle shell, and the latter circuit assembly is arranged in the cover plate.
CN202011406754.9A 2020-12-04 2020-12-04 Built-in angular displacement sensor with adjustable torque Pending CN112414434A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011406754.9A CN112414434A (en) 2020-12-04 2020-12-04 Built-in angular displacement sensor with adjustable torque

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011406754.9A CN112414434A (en) 2020-12-04 2020-12-04 Built-in angular displacement sensor with adjustable torque

Publications (1)

Publication Number Publication Date
CN112414434A true CN112414434A (en) 2021-02-26

Family

ID=74830160

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011406754.9A Pending CN112414434A (en) 2020-12-04 2020-12-04 Built-in angular displacement sensor with adjustable torque

Country Status (1)

Country Link
CN (1) CN112414434A (en)

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