Non-fixed connection type inter-dimension self-decoupling wireless passive two-dimensional sensor

Abstract

The invention discloses a non-fixedly-connected inter-dimension self-decoupling wireless passive two-dimensional sensor which comprises an input end, a connecting plate, an axial force detection element, a steel ball, a steel ball fixing element, a torque detection element and a bearing. According to the non-fixed connection type inter-dimension self-decoupling wireless passive two-dimensional sensor, the parallel input coupling force is split through a reasonable and ingenious structure through the cooperation of the ball and the bearing. The split forces are transmitted to different detection elements along respective transmission paths, so that the detected values of the axial force component and the torsional force component in the parallel double forces are more accurate; the function of the sensor is realized by using fewer parts, and the weight and the processing and manufacturing cost of the sensor are reduced; a power supply line is not required to be connected or data can be acquired through a wired interface; the method can be applied to precision machining, robots and medical equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of sensors, and in particular relates to a non-fixed inter-dimensional self-decoupling wireless passive two-dimensional sensor. Background Art

[0002] A sensor is a device and apparatus that can sense a specified measured quantity and convert it into a usable signal according to a certain rule, and is usually composed of a sensitive element and an elastic element. A multi-dimensional force sensor is a force sensor that can simultaneously measure force and torque information in more than two directions, and is widely used in the fields of robotics, bioengineering, industrial manufacturing, medical and health, etc.

[0003] At the present stage, two-dimensional and even multi-dimensional force sensors are mainly divided into resistive strain type, piezoelectric type, and capacitive force sensors, which have simple structures, high sensitivity and high precision. The structure of the sensor is to paste or install strain sensitive elements on an elastic element of a certain shape by other methods. When a mechanical quantity acts on the elastic element, the elastic element deforms, and the resistance value of the strain sensitive element changes accordingly. Then, the change circuit converts the resistance value change into a voltage change output, and the magnitude of the force can be known according to the voltage change amount.

[0004] However, when the sensor is subjected to the combination of torsional stress and bending stress, in the prior art, the sensor often compensates and splits the force by forming a bridge circuit with strain gauges, and does not have the ability to split the torsional stress and bending stress in the mechanical structure.

[0005] In the existing two-dimensional / multi-dimensional sensors, since wires must be used to connect the strain gauges, even if radio is used for information transmission, the battery has limited power, so it is difficult to achieve long-term dynamic monitoring. Summary of the Invention

[0006] The purpose of the present invention is to provide a non-fixed inter-dimensional self-decoupling wireless passive two-dimensional sensor. Through the cooperation of balls and bearings, the coupled forces input in parallel are split by a reasonable and ingenious structure. The split forces are transmitted along their respective transmission paths to different detection elements, making the detected values of the axial force component and the torsional force component in the parallel double forces more accurate.

[0007] The present invention solves the technical problems by adopting the following technical solutions: A non-fixed inter-dimensional self-decoupling wireless passive two-dimensional sensor, comprising an input end, a connecting plate, an axial force detection element, steel balls, steel ball fixing elements, a torque detection element, and bearings.

[0008] The input end of the sensor is provided with a central threaded hole; four through holes are evenly distributed at 90° intervals with the axis of the central hole as the rotation center on the upper part of the input end;

[0009] The lower end of the input end is a hollow shaft, and 4 spherical grooves are evenly distributed at intervals of 90° with the axis of the central hole as the rotation center at the outer end of the hollow shaft.

[0010] The connecting plate is provided with a central hole, and 4 through holes are evenly distributed at intervals of 90° with the axis of the central hole as the rotation center. Four evenly distributed spherical grooves are provided in the through holes of the connecting plate, and their radii are the same as the radius of the steel balls.

[0011] The top end of the axial force detection element is provided with an external thread. The axial force detection element passes through the hollow shaft at the lower end of the input end and forms a fit with the threaded hole. The middle of the axial force detection element is in the shape of a thin sheet, and the magnetostrictive material is pasted at this position.

[0012] The bottom of the axial force detection element is provided with a shoulder, the purpose of which is for positioning and for force transmission.

[0013] The middle of the steel ball fixing element is a through hole, and 4 small circular through holes are evenly distributed around the through hole.

[0014] The number of the steel balls is 4, and they are installed in the four small circular through holes of the ball fixing element. The connecting plate, the steel ball fixing element and the torque detection element fix the steel balls in the four small circular through holes of the steel ball fixing element.

[0015] The torque detection element is provided with a through hole, and a counterbore with a larger diameter is provided at the bottom, and its function is to install a bearing. The torque detection element is provided with 4 through holes evenly distributed at intervals of 90° with the axis of the central hole as the rotation center. The middle of the torque detection element is in a hollow shape with a lower stiffness, and the magnetostrictive material is pasted at this position.

[0016] The present invention has the following beneficial effects: The non-solidly-connected inter-dimensional self-decoupling wireless passive two-dimensional sensor of the present invention can simultaneously respond to the axial force component and the torsional force component in the parallel double forces, that is, perform structural splitting of the parallel double forces; moreover, there is no need to connect to a power supply line or collect data through a wired interface; it can be applied in precision machining, robots and medical equipment. Description of the Drawings

[0017] Figure 1 is a three-dimensional structural schematic diagram of the non-solidly-connected inter-dimensional self-decoupling wireless passive two-dimensional sensor of the present invention.

[0018] Figure 2 is a three-dimensional structural sectional view of the non-solidly-connected inter-dimensional self-decoupling wireless passive two-dimensional sensor of the present invention.

[0019] Figure 3 is an exploded structural schematic diagram of the non-solidly-connected inter-dimensional self-decoupling wireless passive two-dimensional sensor of the present invention.

[0020] Figure 4It is a structural sectional view of the torque detection element of the present invention.

[0021] Figure 5 It is a three-dimensional structural schematic diagram of the connecting plate of the present invention.

[0022] The markings in the figure are as follows: 1 - input end; 2 - connecting plate; 3 - axial force detection element; 4 - steel ball; 5 - steel ball fixing element; 6 - axial force detection element; 7 - bearing. Specific embodiments

[0023] The technical solution of the present invention will be further described below in conjunction with embodiments and the accompanying drawings.

[0024] Embodiment 1

[0025] This embodiment provides a non - fixedly - connected inter - dimensional self - decoupling wireless passive two - dimensional sensor, including an input end, a connecting plate, an axial force detection element, a steel ball, a steel ball fixing element, a torque detection element, and a bearing.

[0026] The lower end of the input end 1 of the sensor is a through - hole, and the axial force detection element 3 passes through the through - hole and forms a fit with the threaded hole of the input end 1. The bottom of the axial force detection element contacts the bearing 7, and the bearing 7 is fixed in the bottom counter - bore of the torque detection element 6.

[0027] The steel ball 7 is installed in the circular hole of the steel ball fixing element 5. The connecting plate 2 is provided with a central hole, and four through - holes are evenly distributed at 90° intervals with the axis of the central hole as the rotation center.

[0028] The axial force detection element 3 is fixed through the input end 1 and the bearing 7 installed at the bottom of the torque detection element 6.

[0029] Preferably, there is contact but no fit between the input end 1 and the steel ball 4. The input end 1 will not separate from the steel ball 4 when stressed. The connecting plate 2, the steel ball fixing element 5, and the torque detection element 6 are connected by bolts, and the ball 4 is jointly limited by the input end 1, the connecting plate 2, the steel ball fixing element 5, and the torque detection element 6.

[0030] Preferably, when the non-fixed inter-dimensional self-decoupling wireless passive two-dimensional sensor is subjected to a torsional force, since the input end 1 and the axial force detection element 3 are connected by threads and there is a bearing at the bottom of the axial force detection element 3, the torque will not act on the magnetostrictive material of the axial force detection element 3, avoiding the influence of the torsional force on the axial force detection element 3. The input end 1 will transfer the torque to the steel ball fixing element 5 through the ball. Since the connecting plate 2, the steel ball fixing element 5 and the axial force detection element 6 are connected by bolts, the torque will be transferred to the axial force detection element 6, meeting the requirement of the axial force detection element 6 being stressed in a single direction and ensuring the measurement accuracy of the dual-force parallel sensor based on a rigid structure with flexible materials attached. Under the action of the applied excitation magnetic field, the magnetostrictive inverse effect (Villari effect) is generated, and by responding to the magnetic field change through the response coil, the torsional stress can be obtained.

[0031] Preferably, when the non-fixed inter-dimensional self-decoupling wireless passive two-dimensional sensor is subjected to an axial force, the axial force will be transferred to the magnetostrictive material of 3 through the thread fit between the input end 1 and the axial force detection element 3. The input end 1 and the steel ball fixing element 5 do not have direct contact and the force is transmitted through the steel ball 4. However, when the axial force is applied, the steel ball 4 and the input end 1 are only in contact but not fixedly connected, so it will not affect the magnetostrictive material in the axial force detection element 6. The requirement of the axial force detection element 3 being stressed in a single direction is met, ensuring the measurement accuracy of the non-fixed inter-dimensional self-decoupling wireless passive two-dimensional sensor. Under the action of the applied excitation magnetic field, the magnetostrictive inverse effect (Villari effect) is generated, and by responding to the magnetic field change through the response coil, the bending stress can be obtained.

[0032] The order of the above embodiments is only for convenience of description and does not represent the superiority or inferiority of the embodiments.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. However, such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A non-fixed-connected inter-dimensional self-decoupling wireless passive two-dimensional sensor, comprising an input end, a connecting plate, an axial force detection element, steel balls, steel ball fixing elements, a torque detection element, and a bearing. The input end of the sensor is provided with a central hole, with the axis of the central hole as the rotation center, and 4 through holes for connection are provided. The lower part of the input end is a hollow shaft, the top of which is provided with an internal thread, and the outer side of the lower part of the input end is provided with four uniformly distributed spherical grooves; a shoulder is provided at the bottom of the input end. The inner hole diameter of the connecting plate is smaller than the inner hole diameter of the steel ball fixing element. Four spherical grooves are provided at the bottom of the central hole of the connecting plate. The top of the axial force detection element is provided with an external thread. The middle part of the axial force detection element is in the shape of a thin sheet, and magnetostrictive material is pasted at this position. The axial force detection element passes through the hollow shaft of the input end, and the external thread at the top is connected to the threaded hole of the input end. The steel balls are placed in the grooves of the steel ball fixing elements during installation, and are jointly limited by the connecting plate, the steel ball fixing elements and the torque detection element. The steel ball fixing element has 4 through holes for connection with the axis of the central hole as the rotation center. The torque detection element is in the shape of a "gong", and a through hole is axially provided at the top, and is connected to the connecting plate through a bolt. One end of the bolt is fixed on the connecting plate, and the other end is fixed on the torque detection element; the middle of the torque detection element is in a hollow shape, and magnetostrictive material is pasted on the outer side wall; The bearing is fixed at the bottom of the torque detection element, and the bottom of the axial force detection element is positioned at the shoulder position of the input end.

2. The non-fixed-connected inter-dimensional self-decoupling wireless passive two-dimensional sensor according to claim 1, wherein The steel balls are installed between the input end, the torque detection element and the connecting plate; the contact between the steel balls and the input end and the torque detection element is point contact.

3. The non-fixed-connected inter-dimensional self-decoupling wireless passive two-dimensional sensor according to claim 1, characterized in that, The input end, the connecting plate, the torque detection element, the steel balls, the steel ball fixing elements and the torque detection element are connected by bolts; one end of the bolt is fixed on the connecting plate, and one end is fixed on the torque detection element.

4. The non-fixed inter-dimensional self-decoupling wireless passive two-dimensional sensor according to claim 1, wherein One end of the input end and the axial force detection element is connected by thread fit, and the other end of the axial force detection element is fixed by a bearing installed on the torque sensitive element.

5. The non-fixed-connected inter-dimensional self-decoupling wireless passive two-dimensional sensor according to claim 1, wherein The magnetostrictive materials of the axial force detection element and the torque detection element are at a certain distance in the vertical direction and will not affect each other.

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