Built-in torque adjustable angular displacement sensor

Abstract

The present invention discloses a built-in torque-adjustable angular displacement sensor, wherein the inner end of a horizontal rotating shaft passes through a through hole at the front end of a shell from the outside to the inside and is connected to a collector ring assembly, and an elastic washer and an adjusting nut which are sequentially mounted on the rotating shaft from the front to the back are both placed in the inner cavity of the shell and between the front inner wall of the shell and the collector ring assembly, and the adjusting nut is connected to the rotating shaft by a thread, and the front end of the elastic washer contacts the vertical inner wall surface at the front end of the shell, and the rear end of the elastic washer contacts the front end surface of the adjusting nut. 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 forward to compress it or backward 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 a built-in 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 a built-in 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] A built-in torque-adjustable angular displacement sensor comprises 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 built-in torque-adjustable angular displacement sensor also comprises an elastic washer and an adjusting nut, the elastic washer and the adjusting nut are both placed in the inner cavity of the shell and located between the front end inner wall 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 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 vertical inner wall surface of the front end of the shell, and the rear end of the elastic washer contacts the front end surface of the adjusting nut.

[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 the adjusting nut pushes forward, it is compressed, and its elasticity increases, and the pressure and friction on the adjusting nut and the inner 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 backward, the elastic washer stretches backward under the action of its own elasticity, and its elasticity decreases, and the pressure and friction on the adjusting nut and the inner 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 built-in torque-adjustable angular displacement sensor also includes a limit pin, and a forward-concave circular groove is provided in the area on the vertical inner wall at the front end of the shell and located within the elastic gasket. 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. 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 facilitate the rapid and accurate installation of the angular displacement sensor on other equipment, the front end of the shell is provided with a small-diameter cylindrical section with a reduced diameter, and the small-diameter cylindrical section is provided with an external thread and a mounting nut, and a positioning pin for positioning and installing the angular displacement sensor is installed on the vertical outer wall of the shell located on the rear side of the small-diameter cylindrical section.

[0015] Preferably, in order to facilitate quick installation and removal of the positioning pin, the positioning pin is bonded to the shell.

[0016] 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.

[0017] 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.

[0018] The beneficial effects of the present invention are:

[0019] 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 forward to compress it or move it backward 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 in a shell, and when the rotation torque needs to be adjusted, the cover plate needs to be opened, which is a little troublesome, but the overall appearance is more beautiful, and the front end of the shell can be provided with a mounting nut, which is conducive to the rapid installation of the sensor; 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

[0020] Figure 1 It is one of the main cross-sectional views of the built-in torque-adjustable angular displacement sensor of the present invention;

[0021] 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 built-in torque adjustable angular displacement sensor of the present invention;

[0022] 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 built-in torque adjustable angular displacement sensor of the present invention;

[0023] Figure 4 This is a third side structural schematic diagram of the associated structure of the limit pin and the limit convex block of the built-in torque adjustable angular displacement sensor of the present invention;

[0024] Figure 5 This is the second main sectional view of the built-in torque-adjustable angular displacement sensor of the present invention. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings:

[0026] like Figure 1 and Figure 5 As shown, the built-in torque adjustable angular displacement sensor of the present invention comprises a rotating shaft 1, a housing 4, a cover plate 19, a resistor (see Figure 1 and Figure 5 The first resistor 12 and Figure 1 The second resistor 22), the collector ring assembly, the elastic washer 9 and the adjusting nut 10, the resistor and the collector ring assembly are installed in the inner cavity of the shell 4 and the cover plate 19, the inner end of the horizontal 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 4 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 19 is connected to the rear end of the shell 4, the elastic washer 9 and the adjusting nut 10 are both placed in the inner cavity of the shell 4 and are located between the front end inner wall of the shell 4 and the collector ring assembly, the elastic washer 9 and the adjusting nut 10 are sequentially mounted on the rotating shaft 1 from front to back, the adjusting nut 10 is threadedly connected to the rotating shaft 1, the outer peripheral edge of the elastic washer 9 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 9 contacts the vertical inner wall surface of the front end of the shell 4, and the rear end of the elastic washer 9 contacts the front end surface of the adjusting nut 10.

[0027] Figure 1 and Figure 5 Also shown is a clamping ring 5 installed on the rotating shaft 1 and used to limit the rotating shaft 1, which is a conventional structure.

[0028] like Figure 1 and Figure 5 As shown, the basic working principle of the built-in torque adjustable angular displacement sensor of the present invention is as follows:

[0029] 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 10 to rotate, and the resistance generated by the elastic washer 9 on the adjusting nut 10 is applied to the shaft 1, so the rotational torque of the shaft 1 changes due to the pressure of the adjusting nut 10 on the elastic washer 9; according to the actual required rotational torque, after multiple tests and adjustments, the adjusting nut 10 can be adjusted to the most suitable position on the shaft 1 to meet the demand for adjustable rotational torque (including starting torque).

[0030] 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.

[0031] In order to limit and adjust the rotation angle of the rotating shaft 1, the built-in torque-adjustable angular displacement sensor also includes a limit pin 8. A forward-concave circular groove 6 is provided on the vertical inner wall at the front end of the housing 4 and in the area within the elastic washer 9. The limit pin 8 is installed on the rotating shaft 1 and placed in the circular groove 6. The first end of the limit pin 8 is placed outside the rotating shaft 1. A limit protrusion 7 protruding toward the center direction of the circular groove 6 is provided on the circumferential groove wall of the circular groove 6. The limit pin 8 and the limit protrusion 7 meet the following conditions: when the first end of the limit pin 8 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 8 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 rotating shaft 1 must be less than 360°. The specific rotatable angle is calculated as follows: the angle at which the limiting protrusion 7 prevents the limiting pin 8 from rotating plus the rotation angle occupied by the limiting pin 8 itself is the stop angle of the angular displacement sensor. 360° minus the stop angle is the rotatable angle of the rotating shaft 1. By controlling the size and accuracy of the limiting pin 8 and the limiting protrusion 7, the rotation angle and control accuracy of the angular displacement sensor can be controlled. The relative relationship between the limiting pin 8 and the limiting protrusion 7 is shown in Figure 1. Figure 2-Figure 4 As shown, Figure 2 The limiting pin 8 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 8 contacts one side of the limiting protrusion 7, preventing the rotating shaft 1 from continuing to rotate counterclockwise; Figure 4 The limiting pin 8 contacts the other side of the limiting protrusion 7, preventing the rotating shaft 1 from continuing to rotate clockwise.

[0032] 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 8 have an angle and the angle meets the following conditions: the limiting protrusion 7 and the limiting pin 8 are in line contact or surface contact when in contact. In this way, the contact between the two is more stable and reliable than point contact.

[0033] In order to improve the elasticity and life of the elastic gasket 9, the radial cross-section of the elastic gasket 9 is an outward convex shape, which is less likely to be compressed and lose elasticity than an inward concave shape.

[0034] In order to facilitate the quick and accurate installation of the angular displacement sensor on other equipment, the front end of the housing 4 is provided with a small-diameter cylindrical section with a reduced diameter, and the small-diameter cylindrical section is provided with an external thread and is fitted with a mounting nut 2. A positioning pin 3 for positioning and installing the angular displacement sensor is installed on the vertical outer wall of the housing 4 located at the rear side of the small-diameter cylindrical section. During installation, the small-diameter cylindrical section is passed through the mounting hole on the mounting plate of other equipment, positioned by the positioning pin 3, and then the mounting nut 2 is tightened to complete the installation.

[0035] In order to facilitate quick installation and removal of the positioning pin 3, the positioning pin 3 is bonded to the housing 4.

[0036] 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 4 and the cover plate 19 . Figure 1 There are two circuit components in the figure. Figure 5 , which is a circuit component.

[0037] 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 4 is connected to the front end of the middle shell 11 which is open at both the front and rear ends, the rear end of the middle shell 11 is connected to the front end of the cover 19, the former circuit assembly is placed in the middle shell 11, and the latter circuit assembly is placed in the cover 19. Figure 1 and Figure 5 Also shown are a first resistor 12, a first sleeve 13, a first collector ring 14, a first lead 15, a first upper spring 16 and a first lower spring 17 of a first circuit assembly. Figure 1 Also shown are a second resistor 22, a second sleeve 18, a second collector ring 20, a second lead 24, a second upper spring piece 21 and a second lower spring piece 23 of a second circuit component, which are conventional structures.

[0038] 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. A built-in 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 built-in 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 in the inner cavity of the shell and between the front end inner wall of the shell and the collecting ring assembly, the elastic washer and the adjusting nut 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 and the center hole wall of the elastic washer 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 vertical inner wall surface of the front end of the shell, and the rear end of the elastic washer contacts the front end surface of the adjusting nut, and the adjusting nut is used to push the elastic washer forward to compress it or move it backward to stretch it, thereby changing the friction force at the front and rear ends of the elastic washer, thereby changing the rotation The resistance to shaft rotation is used to realize the regulation and control of the rotational torque of the angular displacement sensor; the built-in torque-adjustable angular displacement sensor also includes a limit pin, and the area on the vertical inner wall of the front end of the shell located within the elastic gasket is provided with a forward-concave circular groove, 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 built-in 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 built-in 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 built-in torque adjustable angular displacement sensor according to claim 1 or 2, characterized in that: The front end of the shell is provided with a small-diameter cylindrical section with a reduced diameter, and the small-diameter cylindrical section is provided with an external thread and a mounting nut, and a positioning pin for positioning and installing the angular displacement sensor is installed on the vertical outer wall of the shell located on the rear side of the small-diameter cylindrical section.

5. The built-in torque adjustable angular displacement sensor according to claim 4, characterized in that: The positioning pin is bonded to the housing.

6. The built-in 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.

7. The built-in torque adjustable angular displacement sensor according to claim 6, 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.

Images