External torque adjustable angular displacement sensor

Abstract

The present invention discloses an external torque-adjustable angular displacement sensor, wherein the inner end of a rotating shaft passes through a through hole at the front end of a housing from the outside to the inside, and an adjusting nut and an elastic washer which are sequentially mounted on the rotating shaft from the front to the back are both placed outside the front end of the housing, and the adjusting nut is connected to the rotating shaft by a thread, and the outer peripheral edge of the elastic washer and the central hole wall are not in the same plane and form a front end and a rear end respectively, and the front end of the elastic washer contacts the rear end surface of the adjusting nut, and the rear end of the elastic washer contacts the vertical outer wall surface of the front end of the housing. The present invention installs an elastic washer and an adjusting nut on the rotating shaft, and uses the adjusting nut to push the elastic washer to move backward to compress it or move forward to stretch it, thereby changing the friction force at the front and rear ends of the elastic washer, thereby changing the resistance to the rotation of the rotating shaft, and realizing the adjustment and control of the rotation torque (including the starting torque) of the angular displacement sensor, and is suitable for application occasions where there is a need to adjust and control the rotation torque.

Description

Technical Field

[0001] The invention relates to an angular displacement sensor, in particular to an external torque-adjustable angular displacement sensor with adjustable rotation torque (including starting torque). Background Art

[0002] With the development of science and technology, angular displacement sensors, as angle and position detection mechanisms to achieve the conversion from mechanical motion to electrical signals, are widely used in complete machines and precision instruments such as industry, shipbuilding, aviation, and aerospace that have high technical indicators and various harsh test requirements for high precision and long life. In high-demand applications, relevant requirements will be put forward for the rotation torque (including starting torque) adjustment of the shaft and the rotation angle limit.

[0003] The defects of traditional angular displacement sensors are:

[0004] Traditional angular displacement sensors do not have a structure for regulating and controlling the rotational torque. The distribution of the rotational torque is relatively random and cannot be changed and controlled in practical applications. Therefore, they are not suitable for applications that require regulation and control of the rotational torque.

[0005] Traditional angular displacement sensors do not have a structure to limit the rotation angle of the shaft. The rotation range is generally 360°, that is, there is no angle limit. It is very likely that the circuit or structure will be damaged if it exceeds 360°. Therefore, it is not suitable for applications that require limited control of the rotation angle.

[0006] In addition, traditional angular displacement sensors generally only have one resistor and a set of collector ring components. If a fault occurs, they cannot work normally and the reliability is not high enough. Therefore, they are not suitable for applications with high requirements for angular displacement detection reliability. Summary of the invention

[0007] The purpose of the present invention is to provide an external torque-adjustable angular displacement sensor in order to solve the above-mentioned problem.

[0008] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0009] The invention discloses an external torque-adjustable angular displacement sensor, comprising a rotating shaft, a shell, a cover plate, a resistor and a collector ring assembly, wherein the resistor and the collector ring assembly are installed in the inner cavity of the shell and the cover plate, the inner end of the horizontal rotating shaft passes through the through hole at the front end of the shell from the outside to the inside and is connected to the collector ring assembly, the front end of the cover plate is connected to the rear end of the shell, the external torque-adjustable angular displacement sensor also comprises an elastic washer and an adjusting nut, the elastic washer and the adjusting nut are both placed on the outside of the front end of the shell, the adjusting nut and the elastic washer are sequentially mounted on the rotating shaft from front to back, the adjusting nut is threadedly connected to the rotating shaft, the outer peripheral edge of the elastic washer and the center hole wall are not in the same plane and form a front end and a rear end respectively, the front end of the elastic washer contacts the rear end surface of the adjusting nut, and the rear end of the elastic washer contacts the vertical outer wall surface of the front end of the shell.

[0010] In the above structure, the elastic washer and the adjusting nut are innovative structures of the present invention. The elastic washer can be made of materials such as thin steel sheets and has elasticity. When pushed backward by the adjusting nut, it is compressed, and its elasticity increases, and the pressure and friction on the adjusting nut and the outer wall of the shell increase. The resistance of the rotating shaft when it starts to rotate and during the rotation process increases, that is, the starting torque and rotational torque of the angular displacement sensor increase; conversely, after the adjusting nut moves forward, the elastic washer stretches forward under the action of its own elasticity, and its elasticity decreases, and the pressure and friction on the adjusting nut and the outer wall of the shell decrease. The resistance of the rotating shaft when it starts to rotate and during the rotation process decreases, that is, the starting torque and rotational torque of the angular displacement sensor decrease. Since the adjusting nut is connected to the rotating shaft by a thread, the user can move it forward or backward by rotating the adjusting nut, thereby achieving the purpose of adjusting the rotational torque (including the starting torque) of the angular displacement sensor.

[0011] Preferably, in order to limit and adjust the rotation angle of the rotating shaft, the external torque-adjustable angular displacement sensor also includes a limit pin, and a forward-concave circular groove is provided on the vertical inner wall at the front end of the shell, and the limit pin is installed on the rotating shaft and placed in the circular groove, and the first end of the limit pin is placed outside the rotating shaft, and a limit protrusion protruding toward the center direction of the circular groove is provided on the circumferential groove wall of the circular groove, and the limit pin and the limit protrusion meet the following conditions: when the first end of the limit pin is rotated to the position of the limit protrusion, it can be blocked by the limit protrusion, and when the second end of the limit pin is rotated to the position of the limit protrusion, it cannot be blocked by the limit protrusion. The angle at which the limit pin cannot rotate plus the rotation angle occupied by the limit pin itself is the stop angle of the angular displacement sensor. 360° minus the stop angle is the rotatable angle of the angular displacement sensor. The rotation angle and control accuracy of the angular displacement sensor can be controlled by controlling the size and accuracy of the limit pin and the size of the limit bump.

[0012] Preferably, in order to improve the limiting stability and control accuracy of the rotation angle of the angular displacement sensor, there is an angle between the two side straight lines surfaces on the limiting protrusion for contacting the limiting pin and the angle satisfies the following conditions: the limiting protrusion is in line contact or surface contact with the limiting pin.

[0013] Preferably, in order to improve the elasticity and life of the elastic gasket, the radial cross-section of the elastic gasket is an outward convex shape.

[0014] Preferably, in order to protect the adjusting nut and the elastic washer and to improve aesthetics, a front cover is connected to the front outer wall of the shell, the rotating shaft passes through the central through hole of the front cover, and the adjusting nut and the elastic washer are placed in the front cover.

[0015] According to actual application requirements, one resistor and one collector ring assembly form a circuit assembly, and one or more circuit assemblies are installed in the housing and the cover plate.

[0016] Preferably, in order to meet the requirements of high precision and high reliability, reduce the volume, save costs and facilitate assembly, there are two circuit components, and the two collecting ring components are sequentially mounted on the rotating shaft from front to back, and the rear end of the outer shell is connected to the front end of the middle shell which is open at the front and back, and the rear end of the middle shell is connected to the front end of the cover plate, and the first circuit component is placed in the middle shell, and the second circuit component is placed in the cover plate.

[0017] The beneficial effects of the present invention are:

[0018] The present invention installs an elastic washer and an adjusting nut on the rotating shaft, and uses the adjusting nut to push the elastic washer to move backward to compress it or move forward to stretch it, thereby changing the friction force at the front and rear ends of the elastic washer, thereby changing the resistance to the rotation of the rotating shaft, and realizing the adjustment control of the rotation torque (including the starting torque) of the angular displacement sensor, which is suitable for application occasions where there is a need to adjust and control the rotation torque; the elastic washer and the adjusting nut of the present invention are placed outside the outer end of the shell, which is slightly poor in aesthetics, and the mounting nut for installing the sensor cannot be set at the front end of the shell, but when the rotation torque needs to be adjusted, it can be quickly adjusted, and it is convenient to use; by arranging a limit pin and a limit convex block in the shell, the rotating shaft cannot be rotated 360 degrees, that is, it has an angle limit function, avoids the damage problem caused by the rotating shaft rotating beyond the limit position, and is suitable for application occasions where there is a need for limited control of the rotation angle; by arranging two or more circuit components, even if one of the circuit components is damaged, it can still work normally, thereby improving the product reliability, and is suitable for application occasions where the reliability of angular displacement detection is required to be high. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is one of the main cross-sectional views of the external torque-adjustable angular displacement sensor of the present invention;

[0020] Figure 2 It is one of the side structural schematic diagrams of the associated structure of the limit pin and the limit convex block of the external torque adjustable angular displacement sensor of the present invention;

[0021] Figure 3 This is a second side view structural schematic diagram of the associated structure of the limit pin and the limit convex block of the external torque adjustable angular displacement sensor of the present invention;

[0022] Figure 4 This is a third side view structural schematic diagram of the associated structure of the limit pin and the limit convex block of the external torque adjustable angular displacement sensor of the present invention;

[0023] Figure 5 This is the second main sectional view of the external torque-adjustable angular displacement sensor of the present invention. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings:

[0025] like Figure 1 and Figure 5 As shown, the external torque adjustable angular displacement sensor of the present invention comprises a rotating shaft 1, a housing 6, a cover plate 18, a resistor (see Figure 1 and Figure 5 The first resistor 11 and Figure 1The second resistor 23), the collector ring assembly, the elastic washer 4 and the adjusting nut 3, the resistor body and the collector ring assembly are installed in the inner cavity of the shell 6 and the cover plate 18, the inner end of the transverse rotating shaft 1 (the rear end and the right end in the figure) passes through the through hole at the front end of the shell 6 from the outside to the inside (from the front to the back and from the left to the right in the figure) and is connected to the collector ring assembly, the front end of the cover plate 18 is connected to the rear end of the shell 6, the elastic washer 4 and the adjusting nut 3 are both placed on the outside of the front end of the shell 6, the adjusting nut 3 and the elastic washer 4 are sequentially mounted on the rotating shaft 1 from the front to the back, the adjusting nut 3 and the rotating shaft 1 are connected by threads, the outer peripheral edge of the elastic washer 4 and the center hole wall are not in the same plane and form a front end and a rear end respectively, the front end of the elastic washer 4 contacts the rear end surface of the adjusting nut 3, and the rear end of the elastic washer 4 contacts the vertical outer wall surface of the front end of the shell 6.

[0026] Figure 1 and Figure 5 Also shown are two clamping rings 5 ​​which are installed on the rotating shaft 1 and are used to limit the rotating shaft 1, which is a conventional structure.

[0027] like Figure 1 and Figure 5 As shown, the basic working principle of the external torque adjustable angular displacement sensor of the present invention is as follows:

[0028] The rotation of the shaft 1 drives the collector ring assembly to rotate, and the reed of the collector ring assembly rotates in contact on the working surface of the resistor to complete the collection of electrical signals; at the same time, the rotation of the shaft 1 drives the adjusting nut 3 to rotate, and the resistance generated by the elastic washer 4 on the adjusting nut 3 is applied to the shaft 1, so the rotational torque of the shaft 1 changes due to the pressure of the adjusting nut 3 on the elastic washer 4; according to the actual required rotational torque, after multiple tests and adjustments, the adjusting nut 3 can be adjusted to the most suitable position on the shaft 1 to meet the demand for adjustable rotational torque (including starting torque).

[0029] like Figure 1-Figure 5 As shown, the present invention also discloses the following multiple more optimized structures. According to actual needs, one or more of the following structures can be superimposed and combined with the above structure to form a more optimized technical solution.

[0030] In order to limit and adjust the rotation angle of the rotating shaft 1, the external torque-adjustable angular displacement sensor also includes a limit pin 9. A circular groove 8 concave forward is provided on the vertical inner wall at the front end of the shell 6. The limit pin 9 is installed on the rotating shaft 1 and placed in the circular groove 8. The first end of the limit pin 9 is placed outside the rotating shaft 1. A limit protrusion 7 protruding toward the center direction of the circular groove 8 is provided on the circumferential groove wall of the circular groove 8. The limit pin 9 and the limit protrusion 7 meet the following conditions: when the first end of the limit pin 9 rotates to the position of the limit protrusion 7, it can be blocked by the limit protrusion 7, and when the second end of the limit pin 9 rotates to the position of the limit protrusion 7, it cannot be blocked by the limit protrusion 7. When in use, the rotatable angle of the shaft 1 must be less than 360°. The specific rotatable angle is calculated as follows: the angle at which the limit pin 9 cannot rotate plus the rotation angle of the limit pin 9 itself is the stop angle of the angular displacement sensor. 360° minus the stop angle is the rotatable angle of the shaft 1. By controlling the size and accuracy of the limit pin 9 and the limit bump 7, the rotation angle and control accuracy of the angular displacement sensor can be controlled. The relative relationship between the limit pin 9 and the limit bump 7 is shown in Figure 1. Figure 2-Figure 4 As shown, Figure 2 The limiting pin 9 in the middle does not contact the limiting protrusion 7, and does not affect the rotation of the shaft 1; Figure 3 The limiting pin 9 contacts one side of the limiting protrusion 7, preventing the rotating shaft 1 from continuing to rotate counterclockwise; Figure 4 The limiting pin 9 contacts the other side of the limiting protrusion 7, preventing the rotating shaft 1 from continuing to rotate clockwise.

[0031] In order to improve the limiting stability and control accuracy of the rotation angle of the angular displacement sensor, the two straight line surfaces on the limiting protrusion 7 for contacting the limiting pin 9 have an angle and the angle meets the following conditions: the limiting protrusion 7 is in line contact or surface contact with the limiting pin 9. In this way, the contact between the two is more stable and reliable than point contact.

[0032] In order to improve the elasticity and life of the elastic gasket 4, the radial cross section of the elastic gasket 4 is an outward convex shape, which is less likely to be compressed and lose elasticity than an inward concave shape.

[0033] In order to protect the adjusting nut 3 and the elastic washer 4 and to improve the appearance, a front cover 2 is connected to the front outer wall of the housing 6, the rotating shaft 1 passes through the central through hole of the front cover 2, and the adjusting nut 3 and the elastic washer 4 are placed in the front cover 2. When the rotation torque needs to be adjusted, the front cover 2 is opened and the adjusting nut 3 is rotated.

[0034] According to actual application requirements, one resistor and one collector ring assembly form a circuit assembly, and one or more circuit assemblies are installed in the housing 6 and the cover plate 18 . Figure 1 There are two circuit components in the figure. Figure 5 , which is a circuit component.

[0035] In order to meet the requirements of high precision and high reliability and reduce the volume, save costs and facilitate assembly, the circuit components are two, such as Figure 1 As shown, the two collecting ring assemblies are sequentially mounted on the rotating shaft 1 from front to back, the rear end of the outer shell 6 is connected to the front end of the middle shell 10 which is open at both the front and rear ends, the rear end of the middle shell 10 is connected to the front end of the cover plate 18, the former circuit assembly is placed in the middle shell 10, and the latter circuit assembly is placed in the cover plate 18. Figure 1 and Figure 5 Also shown are a first resistor 11, a first sleeve 12, a first collector ring 13, a first lead 14, a first upper spring 15 and a first lower spring 16 of a first circuit assembly. Figure 1 Also shown are a second resistor 23, a second sleeve 17, a second collector ring 20, a second lead 19, a second upper spring 21 and a second lower spring 22 of a second circuit component, which are conventional structures.

[0036] The above embodiments are only preferred embodiments of the present invention and are not limitations of the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. An external torque adjustable angular displacement sensor, comprising a rotating shaft, a housing, a cover plate, a resistor and a collector ring assembly, wherein the resistor and the collector ring assembly are installed in the inner cavity of the housing and the cover plate, the inner end of the horizontal rotating shaft passes through the through hole at the front end of the housing from the outside to the inside and is connected to the collector ring assembly, and the front end of the cover plate is connected to the rear end of the housing, characterized in that: The external torque-adjustable angular displacement sensor also includes an elastic washer and an adjusting nut, wherein the elastic washer and the adjusting nut are both placed on the outside of the front end of the shell, and the adjusting nut and the elastic washer are sequentially mounted on the rotating shaft from front to back, and the adjusting nut is threadedly connected to the rotating shaft, and the outer peripheral edge of the elastic washer and the center hole wall are not in the same plane and form a front end and a rear end respectively, and the front end of the elastic washer contacts the rear end surface of the adjusting nut, and the rear end of the elastic washer contacts the vertical outer wall surface of the front end of the shell, and the adjusting nut is used to push the elastic washer backward to compress it or forward to stretch it, thereby changing the friction force at the front and rear ends of the elastic washer, thereby changing the rotation of the rotating shaft. Resistance, to achieve the adjustment and control of the rotational torque of the angular displacement sensor; the external torque-adjustable angular displacement sensor also includes a limit pin, a circular groove concave forward is provided on the vertical inner wall of the front end of the shell, the limit pin is installed on the rotating shaft and placed in the circular groove, the first end of the limit pin is placed outside the rotating shaft, and a limit protrusion protruding toward the center direction of the circular groove is provided on the circumferential groove wall of the circular groove, the limit pin and the limit protrusion meet the following conditions: when the first end of the limit pin is rotated to the position of the limit protrusion, it can be blocked by the limit protrusion, and when the second end of the limit pin is rotated to the position of the limit protrusion, it cannot be blocked by the limit protrusion.

2. The external torque adjustable angular displacement sensor according to claim 1, characterized in that: There is an angle between the two side straight lines on the limiting protrusion for contacting the limiting pin, and the angle satisfies the following condition: the limiting protrusion is in line contact or surface contact with the limiting pin.

3. The external torque adjustable angular displacement sensor according to claim 1 or 2, characterized in that: The radial cross section of the elastic gasket is an outward convex shape.

4. The external torque adjustable angular displacement sensor according to claim 1 or 2, characterized in that: A front cover is connected to the front outer wall of the shell, the rotating shaft passes through the central through hole of the front cover, and the adjusting nut and the elastic washer are placed in the front cover.

5. The external torque adjustable angular displacement sensor according to claim 1 or 2, characterized in that: One resistor and one collector ring assembly form a circuit assembly, and one or more circuit assemblies are installed in the housing and the cover plate.

6. The external torque adjustable angular displacement sensor according to claim 5, characterized in that: There are two circuit components, and the two collecting ring components are sequentially mounted on the rotating shaft from front to back. The rear end of the outer shell is connected to the front end of the middle shell which is open at the front and back, and the rear end of the middle shell is connected to the front end of the cover plate. The first circuit component is placed in the middle shell, and the second circuit component is placed in the cover plate.

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