CN203241182U - Spoke/center pin column combined-type three-dimensional force sensor - Google Patents

Abstract

The utility model discloses a three-dimensional force sensor combined with a wheel spoke and a center pin, which belongs to the field of sensor technology applications, and in particular relates to a novel three-dimensional force sensor, which is mainly used in three-dimensional force detection. The sensor is composed of an elastic body (1) and a strain gauge group (2). The elastic body (1) is an integral symmetrical structure consisting of a spoke base (3), a rib (5) and a center pin (4 ), the rib plate (5) consists of four pieces, which contain eight sides perpendicular to the XY plane, and the strain gauge group (2) includes 12 strain gauge pairs, which are respectively pasted on the elastic body (1) four On the eight sides of four rectangular sides and four ribs (5), the strain gauge group (2) produces strain with the change of shape of the elastic body (1) and causes the resistance to change, and through the Wheatstone bridge composed of strain gauges Output three voltage signals that change linearly and proportionally to the three-direction component forces F _X , F _Y , and F _Z respectively.

Description

Three-dimensional force sensor combined with spoke and central pin

technical field

The utility model belongs to the application field of sensor technology, in particular to a novel three-dimensional force sensor, which is mainly used in three-dimensional force detection.

Background technique

Three-dimensional force sensors are widely used in machinery manufacturing, robots, test detection and other fields. At present, the common sensors at home and abroad mainly include strain gauge and piezoelectric crystal, and the elastic body structure can be divided into cantilever beam type, double beam type, four beam type, island type, spoke type and so on. At the same time, a multi-sensor parallel decoupling three-dimensional force sensor based on the Stewart structure has been developed. However, these sensors have defects such as complex structure, poor linearity, low stiffness, inconvenient calibration, low sensitivity, and high manufacturing cost. Moreover, the developed three-dimensional force sensors often use tensile, compressive, and bending stresses, namely The principle of normal stress to achieve load measurement has the following disadvantages: the change of the force point will cause a large change in sensitivity; the deviation of sensitivity is relatively large when the tension and compression cycle loading is carried out; the ability to resist eccentric load and lateral load is poor; Large height or width, so the volume is large; the measurement of small loads cannot be carried out. These problems have affected the improvement of the main technical indicators of force measurement and load cells. At the same time, these sensors are inconvenient to install and fix, which makes it difficult to use multiple three-dimensional force sensors in parallel, and cannot meet the needs of rail vehicle bogie parameter testing.

Contents of the invention

The technical problem to be solved by the utility model is to overcome the problems existing in the prior art, and provide a three-dimensional force sensor with high measurement accuracy and compact structure combined with a wheel spoke and a center pin.

In order to solve the above-mentioned technical problems, the utility model is realized by adopting the following technical solutions, which are explained as follows in conjunction with the accompanying drawings:

A three-dimensional force sensor combined with a spoke and a center pin, characterized in that:

The sensor is composed of an elastic body 1 and a strain gauge group 2. The elastic body 1 is an integral symmetrical structure composed of a spoke base 3, a rib plate 5 and a center pin 4, and the center pin 4 passes through the rib plate 5 is connected to the center of the spoke base 3, and the surface of the central pin 4 includes four rectangular sides, two of which are symmetrically parallel and perpendicular to the XY plane, that is, the bottom plane of the spoke base 3, and the ribs 5 are four pieces, It contains eight sides perpendicular to the XY plane, and the strain gauge group 2 includes 12 strain gauge pairs,

Respectively pasted on the four rectangular sides of the central pin 4 in the elastic body 1 and the eight sides of the four ribs 5 perpendicular to the XY plane, the strain gauge group 2 produces strain with the change of the shape of the elastic body 1 resulting in The resistance changes, and through the Wheatstone bridge composed of strain gauges, it outputs three voltage signals that are linearly proportional to the component forces F _X , F _Y , and F _Z in three directions.

The four rectangular sides on the center pin post 4 include: the first side 10 of the square post, the second side 11 of the square post, the third side 12 of the square post and the fourth side 13 of the square post, wherein the first side of the square post 10 and the third side 12 of the square column are parallel to the X axis, the second side 11 of the square column and the fourth side 13 of the square column are parallel to the Y axis, and the four ribs 5 include eight sides perpendicular to the XY plane.

The first pair of strain gauges 22 , the second pair of strain gauges 23 , the third pair of strain gauges 24 and the fourth pair of strain gauges 25 of the strain gauge group 2 correspond to the first side 10 , On the four sides of the second side 11 of the square column, the third side 12 of the square column and the fourth side 13 of the square column, the fifth strain gauge pair 26, the sixth strain gauge pair 27, the seventh strain gauge pair 28, the eighth strain gauge pair The strain gauge pair 29, the ninth strain gauge pair 30, the tenth strain gauge pair 31, the eleventh strain gauge pair 32 and the twelfth strain gauge pair (33) respectively correspond to the four ribs 5 attached to the elastic body 1. on eight sides.

Each pair of strain gauges in the strain gauge group 2 includes two identical uniaxial strain gauges, which are pasted on the same side of the elastic body 1. The angles are 45° and 135° respectively.

In the first strain gauge pair 22 and the third strain gauge pair 24, the 1a uniaxial strain gauges 34 and 2a uniaxial strain gauges (36) have a longitudinal center axis of symmetry at an angle of 45° to the X axis, and the 1b uniaxial strain gauges 35, 2b uniaxial strain gauges (37) have an angle of 135° between the longitudinal central axis of symmetry and the X axis; 3a uniaxial strain gauges 38, 4a uniaxial strain gauges in the second strain gauge pair 23 and the fourth strain gauge pair 25 The longitudinal center axis of symmetry of (40) forms an included angle of 45° with the Y axis, and the longitudinal center axis of 3b uniaxial strain gauges 39 and 4b uniaxial strain gauges (41) form an included angle of 135° with the Y axis;

The included angles between the longitudinal symmetry center line of the two uniaxial strain gauges in the eight strain gauge pairs on the eight sides of the four rib plates 5 and the Z direction, that is, perpendicular to the XY plane, are 45° and 135° respectively.

The four strain gauges in the first strain gauge pair 22 and the third strain gauge pair 24 form a Wheatstone bridge, forming a full-bridge measurement circuit for measuring the component force in the X-axis direction; the second strain gauge pair 23 and The fourth strain gauge pair 25 forms a Wheatstone bridge, which is used for a full-bridge measurement circuit for measuring component forces in the Y-axis direction.

The four uniaxial strain gauges in the fifth strain gauge pair 26 and the sixth strain gauge pair 27 form a Wheatstone bridge, forming a full-bridge measurement circuit for measuring the component force in the Z-axis direction; the seventh strain gauge Four uniaxial strain gauges in the pair 28 and the eighth strain gauge pair 29 form a Wheatstone bridge to form a full-bridge measurement circuit for measuring the component force in the Z-axis direction; the ninth strain gauge pair 30 and the tenth strain gauge pair The four uniaxial strain gauges in the sheet pair 31 form a Wheatstone bridge to form a full-bridge measurement circuit for measuring the component force in the Z-axis direction; the eleventh strain gauge pair 32 and the twelfth strain gauge pair 33 The four uniaxial strain gauges constitute a Wheatstone bridge, forming a full-bridge measurement circuit for measuring the component force in the Z-axis direction;

Connect the input power of the above four full-bridge measurement circuits for measuring the component force in the Z-axis direction in parallel, and connect the four positive signal outputs of the four full-bridge measurement circuits in parallel to form a positive signal output; connect the four full-bridge measurement circuits The four negative signal outputs are connected in parallel to form a negative signal output, thereby forming a parallel measurement circuit for measuring the component force in the Z-axis direction.

Compared with the prior art, the beneficial effects of the utility model are:

1. The sensor has stable sensitivity and strong ability to resist eccentric load and lateral load.

2. Simple and compact structure, easy to install.

3. The interference between sensor dimensions is small, and the measurement accuracy is high.

Description of drawings

Fig. 1 is the axonometric projection diagram of the combined three-dimensional force sensor of the wheel spoke and the center pin described in the utility model;

Fig. 2 is the front view of the elastic body in the combined three-dimensional force sensor of the spoke and center pin described in the utility model;

Fig. 3 is a sectional view along the A-A section in Fig. 2;

Fig. 4 is the axonometric projection diagram of the elastic body in the three-dimensional force sensor of the spoke and center pin combined type described in the utility model;

Fig. 5 is the front view of the combined three-dimensional force sensor of the spoke and center pin described in the utility model;

Fig. 6 is a sectional view along A-A section among Fig. 5;

Fig. 7 is a schematic diagram of the sticking position of the strain gauge pair in the three-dimensional force sensor of the combined spoke and center pin described in the present invention;

Fig. 8 is a schematic diagram of a full-bridge measurement circuit in the X-axis direction in the combined three-dimensional force sensor of the spoke and center pin described in the present invention;

Fig. 9 is a schematic diagram of a full-bridge measurement circuit in the Y-axis direction in the combined three-dimensional force sensor of the spoke and center pin described in the present invention;

Fig. 10 is a schematic diagram of a parallel measurement circuit in the Z-axis direction in the combined three-dimensional force sensor of the spoke and center pin according to the present invention.

In the figure: 1. Elastic body, 2. Strain gauge group, 3. Spoke base, 4. Center pin, 5. Rib plate, 6. Cylindrical section, 7. Square sticker section, 8. Boss section, 9. Mounting section, 10. The first side of the square column, 11. The second side of the square column, 12. The third side of the square column, 13. The fourth side of the square column, 14. The first side of the spoke rib, 15. The spoke rib The second side, 16. The third side of the spoke rib, 17. The fourth side of the spoke rib, 18. The fifth side of the spoke rib, 19. The sixth side of the spoke rib, 20. The seventh side of the spoke rib, 21 .The eighth side of the spoke web, 22. The first pair of strain gauges, 23. The second pair of strain gauges, 24. The third pair of strain gauges, 25. The fourth pair of strain gauges, 26. The fifth pair of strain gauges, 27. The sixth pair of strain gauges, 28. The seventh pair of strain gauges, 29. The eighth pair of strain gauges, 30. The ninth pair of strain gauges, 31. The tenth pair of strain gauges, 32. The eleventh pair of strain gauges, 33. The first pair of strain gauges Twelve strain gauge pairs, 34.1a uniaxial strain gauge, 35.1b uniaxial strain gauge, 36.2a uniaxial strain gauge, 37.2b uniaxial strain gauge, 38.3a uniaxial strain gauge, 39.3b uniaxial strain gauge, 40.4a Uniaxial strain gauge, 41.4b uniaxial strain gauge, 42.5a uniaxial strain gauge, 43.5b uniaxial strain gauge, 44.6a uniaxial strain gauge, 45.6b uniaxial strain gauge, 46.7a uniaxial strain gauge, 47.7b single Axial strain gauge, 48.8a uniaxial strain gauge, 49.8b uniaxial strain gauge, 50.9a uniaxial strain gauge, 51.9b uniaxial strain gauge, 52.10a uniaxial strain gauge, 53.10b uniaxial strain gauge, 54.11a uniaxial Strain gauge, 55.11b uniaxial strain gauge, 56.12a uniaxial strain gauge, 57.12b uniaxial strain gauge.

Detailed ways

Below in conjunction with accompanying drawing, specific content of the present utility model and its embodiment are described in detail:

Referring to Fig. 1, the combined three-dimensional force sensor of the wheel spoke and the center pin described in the utility model includes an elastic body 1 and a strain gauge group 2, wherein the elastic body 1 is a special-shaped symmetrical structure, and the strain gauge group 2 includes 12 strain gauges Yes, paste them on the surface at different positions of the elastic body 1 respectively.

Referring to Fig. 2, Fig. 3 and Fig. 4, the elastic body 1 is a special-shaped structure, which is composed of three parts: the spoke base 3, the rib plate 5 and the center pin 4, wherein the spoke base 3 is a square ring structure, the outer four corners are processed with transition fillets, the inner is circular and hollow, and the bottom surface of the spoke base 3 is parallel to the XY plane. The central pin 4 is a cylindrical structure, which can be divided into a bottom cylindrical section 6, a square sticker section 7, a boss section 8 and a clamping section 9 according to different shapes. The central axis of symmetry of the center pin 4 coincides with the axis of symmetry of the center of the spoke base 3 , which is the axis of symmetry of the elastic body 1 . The bottom surface of the central pin 4 is higher than the bottom surface of the spoke base 3, and four ribs 5 are evenly distributed between the spoke base 3 and the cylindrical section 6 of the central pin 4 to connect the two to form a complete structure , so that the external three-dimensional force applied to the clamping section 9 of the center pin 4 is completely transmitted to the spoke base 3 through the four ribs 5 .

The spoke base 3 is processed with threaded holes, so that the spoke base 3 can be fixed on other objects by bolts.

The boss section 8 and the clamping section 9 of the center pin 4 are respectively processed with a cylindrical boss and a cylindrical shaft, and threads are processed on the top to facilitate the clamping and fixing of the top end of the elastic body 1 . The square sticker segment 7 is a square cylinder with symmetrical structure, and the intersection line of the central symmetrical plane parallel to the XZ plane of the square sticker segment 7 and the central symmetrical plane parallel to the YZ plane of the square sticker segment 7 is symmetrical to the center of the center pin 4 The axes coincide. The square patch segment 7 has four rectangular sides of equal size and perpendicular to the XY plane: the first side 10 of the square pillar, the second side 11 of the square pillar, the third side 12 of the square pillar and the fourth side 13 of the square pillar. Wherein, the first side 10 of the square column and the third side 12 of the square column are parallel to the X axis, and the second side 11 of the square column and the fourth side 13 of the square column are parallel to the Y axis. In order to improve the sensitivity of the sensor, on the premise of meeting the required rigidity, the central pin 4 is machined with a central round hole to ensure that the square sticker segment 7 produces sufficient deformation when it is subjected to lateral forces along the X-axis and Y-axis.

Between the spoke base 3 and the central pin 4 are evenly distributed four ribs 5 with the same shape and size and symmetrical structure, and the four ribs 5 are connected to the central symmetrical plane perpendicular to the XY plane. The central axis of symmetry coincides. The four ribs 5 have a total of 8 sides perpendicular to the XY plane: the first side 14 of the spoke rib, the second side 15 of the spoke rib, the third side 16 of the spoke rib, the fourth side 17 of the spoke rib, and the spoke rib The fifth side 18, the sixth side 19 of the spoke rib, the seventh side 20 of the spoke rib, and the eighth side 21 of the spoke rib.

Referring to Fig. 5 and Fig. 6, the strain gauge group 2 includes 12 strain gauge pairs in total: the first strain gauge pair 22, the second strain gauge pair 23, the third strain gauge pair 24, the fourth strain gauge pair 25, the fifth strain gauge pair Gauge pair 26, sixth strain gauge pair 27, seventh strain gauge pair 28, eighth strain gauge pair 29, ninth strain gauge pair 30, tenth strain gauge pair 31, eleventh strain gauge pair 32, twelfth strain gauge pair The strain gauge pairs 33, each strain gauge pair consists of two identical uniaxial strain gauges.

Referring to Figure 7, the included angles between the two uniaxial strain gauge longitudinal center symmetry lines of each strain gauge pair and the axes parallel to the measured component force F of the strain gauge pair are 45° and 135° respectively, so as to simultaneously measure the shear stress generated Two principal stresses of equal magnitude perpendicular to each other and of tension and compression form a pair.

Referring to Fig. 5, Fig. 6, Fig. 8 and Fig. 9, the first pair of strain gauges 22, the second pair of strain gauges 23, the third pair of strain gauges 24, and the fourth pair of strain gauges 25 are respectively pasted on the square stickers of the center pin 4. The four sides of the segment 7: the first side 10 of the square column, the second side 11 of the square column, the third side 12 of the square column and the fourth side 13 of the square column. At the same time, the first pair of strain gauges 22, the second pair of strain gauges 23. The positions of the third pair of strain gauges 24 and the fourth pair of strain gauges 25 relative to their pasting sides are the same. Wherein, the first pair of strain gauges 22 is attached to the first side 10 of the square column, and the third pair of strain gauges 24 is attached to the third side 12 of the square column. The 1a uniaxial strain gauge 34 with an angle of 45° to the X-axis in the first strain gauge pair 22, the 1b uniaxial strain gauge 35 with a 135° angle to the X-axis and the third strain gauge pair 24 with an angle to the X-axis The 2a uniaxial strain gauge 36 with an included angle of 45° and the 2b uniaxial strain gauge 37 with an angle of 135° to the X-axis have the same sensitivity coefficient, and the initial resistance value is Rx, forming a Wheatstone bridge for measuring the X-axis direction The full-bridge measurement circuit of component force, Ex is the power supply voltage of the component force measurement circuit in the X-axis direction, and Ux is the output signal voltage of the component force measurement circuit in the X-axis direction; the second strain gauge pair 23 is pasted on the second side of the square column 11, The fourth strain gauge pair 25 is pasted on the fourth side 13 of the square column, the 3a uniaxial strain gauge 38 which forms an angle of 45° with the Y axis in the second strain gauge pair 23, and the 3b uniaxial strain gauge 38 which forms an angle of 135° with the Y axis. The sensitivity coefficients of the axial strain gauge 39 and the 4a uniaxial strain gauge 40 having an angle of 45° with the Y-axis and the 4b uniaxial strain gauge 41 having an angle of 135° with the Y-axis in the fourth strain gauge pair 25 are the same. The resistance value is Ry, which constitutes a Wheatstone bridge to form a full-bridge measurement circuit for measuring the component force in the Y-axis direction. output signal voltage.

Referring to Fig. 5, Fig. 6 and Fig. 10, the fifth strain gauge pair 26, the sixth strain gauge pair 27, the seventh strain gauge pair 28, the eighth strain gauge pair 29, the ninth strain gauge pair 30, and the tenth strain gauge pair 31. The eleventh strain gauge pair 32 and the twelfth strain gauge pair 33 are respectively pasted on the eight sides of the four ribs in the spoke base 3: the first side of the spoke rib 9, the second side of the spoke rib 15, On the third side 16 of the spoke rib, the fourth side 17 of the spoke rib, the fifth side 18 of the spoke rib, the sixth side 19 of the spoke rib, the seventh side 20 of the spoke rib, and the eighth side 21 of the spoke rib. The above eight strain gauge pairs have the same positions relative to their pasting sides, and the sensitivity coefficients of the sixteen uniaxial strain gauges of the eight strain gauge pairs are all the same, and the initial resistance values are all Rz. The fifth strain gauge pair 26 is pasted on the first side 14 of the spoke rib, and the sixth strain gauge pair 27 is pasted on the second side 15 of the spoke rib. In the fifth strain gauge pair 26, the 5a uniaxial strain gauge 42 forming an angle of 45° with the Z axis, the 5b uniaxial strain gauge 43 forming an angle of 135° with the Z axis, and the sixth strain gauge pair 27 forming an angle with the Z axis The 6a uniaxial strain gauge 44 with an included angle of 45° and the 6b uniaxial strain gauge 45 with an angle of 135° to the X-axis have the same sensitivity coefficient, and the initial resistance value is RZ, forming a Wheatstone bridge for measuring the Z-axis direction Full-bridge measuring circuit for component force;

Similarly, four uniaxial strain gauges in the seventh strain gauge pair 28 and the eighth strain gauge pair 29: 7a uniaxial strain gauge 46, 7b uniaxial strain gauge 47, 8a uniaxial strain gauge 48, 8b uniaxial strain gauge Sheet 49 constitutes a Wheatstone bridge, forming a full-bridge measurement circuit for measuring the component force in the Z-axis direction; four uniaxial strain gauges in the ninth strain gauge pair 30 and the tenth strain gauge pair 31: 9a uniaxial Strain gauges 50, 9b uniaxial strain gauges 51, 10a uniaxial strain gauges 52, 10b uniaxial strain gauges 53 constitute a Wheatstone bridge, forming a full-bridge measurement circuit for measuring the component force in the Z-axis direction; the eleventh Four uniaxial strain gauges in the strain gauge pair 32 and the twelfth strain gauge pair 33: 11a uniaxial strain gauge 54, 11b uniaxial strain gauge 55, 12a uniaxial strain gauge 56, 12b uniaxial strain gauge 57 Wheatstone bridge, forming a full-bridge measurement circuit for measuring the force component in the Z-axis direction. The above-mentioned four full-bridge measurement circuits for measuring the Z-axis direction component force are uniformly provided with the required power supply signals, and the four positive signal outputs of the four full-bridge measurement circuits are connected in parallel to form a positive signal output; the four Four negative signal outputs in the full-bridge measurement circuit are connected in parallel to form one negative signal output, thereby forming a parallel measurement circuit for measuring the component force in the Z-axis direction.

The working principle of the three-dimensional force sensor combined with the spoke and the center pin:

When the spoke and center pin combined three-dimensional force sensor is working, the clamping section 9 of the center pin 4 in the elastic body 1 is fixedly connected with the force-applying object, and the spoke base 3 in the elastic body 1 is fixed on the bearing by means of bolts or the like. force on the object. When the external force acts on the combined three-dimensional force sensor of the wheel spoke and the center pin through the center pin 4, under the action of the X-axis and Y-axis direction components FX and FY, the center pin 4 generates shear stress, and the Z-axis direction component force Under the action of FZ, the four ribs 5 in the elastic body 1 generate shear stress. Since the shear stress produces two principal stresses that are equal in size and perpendicular to each other in the direction of 45° and that are doubled in tension and compression, the pairs of strain gauges pasted on the four sides of the square patch segment 7 and the 8 sides of the rib plate The corresponding change in resistance value occurs. After supplying the required power supply voltage to the X-axis direction component force measurement circuit, Y-axis direction component force measurement circuit, and Z-axis direction component force parallel measurement circuit, each measurement circuit outputs an output voltage signal proportional to the magnitude of the component force in the corresponding direction. The measured three-dimensional force value can be obtained after the data acquisition system calibrates the output signal of the combined three-dimensional force sensor of the spoke and the center pin.

Claims (6)

1. a spoke and centrepin column combination formula three-dimensional force sensor is characterized in that:

This sensor is comprised of elastic body (1) and foil gauge group (2), described elastic body (1) is a monoblock type symmetrical structure, by spoke pedestal (3), gusset (5) forms with center pin (4), described center pin (4) is connected to the center of spoke pedestal (3) by gusset (5), comprise four rectangle sides on center pin (4) face, symmetrical parallel and be that spoke pedestal (3) baseplane is vertical with the XY plane in twos wherein, described gusset (5) is four, comprise eight sides vertical with the XY plane on it, described foil gauge group (2) comprises 12 foil gauges pair, stick on respectively on four rectangle sides and eight of four gussets (5) sides vertical with the XY plane on the center pin (4) in the elastic body (1), described foil gauge group (2) produces strain with elastic body (1) change of shape and causes resistance variations, and the Wheatstone bridge output that forms by foil gauge respectively with three direction component F _X, F _Y, F _ZThree voltage signals that linear direct ratio changes.

2. spoke according to claim 1 and centrepin column combination formula three-dimensional force sensor is characterized in that:

Four rectangle sides on described center pin (4) face comprise: square column the first side (10), square column the second side (11), square column the 3rd side (12) and square column the 4th side (13), wherein, square column the first side (10) is parallel with X-axis with square column the 3rd side (12), square column the second side (11) is parallel with Y-axis with square column the 4th side (13), comprises eight sides vertical with the XY plane on four gussets (5).

3. spoke according to claim 1 and 2 and centrepin column combination formula three-dimensional force sensor is characterized in that:

The first foil gauge of described foil gauge group (2) is to (22), the second foil gauge is to (23), the 3rd foil gauge sticks on respectively square column first side (10) of center pin (4) to (25) to (24) and the 4th foil gauge, square column the second side (11), on four sides on square column the 3rd side (12) and square column the 4th side (13), the 5th foil gauge is to (26), the 6th foil gauge is to (27), the 7th foil gauge is to (28), the 8th foil gauge is to (29), the 9th foil gauge is to (30), the tenth foil gauge is to (31), the 11 foil gauge sticks on respectively on eight sides of four gussets (5) in the elastic body (1) (33) (32) and the 12 foil gauge.

4. spoke according to claim 1 and 2 and centrepin column combination formula three-dimensional force sensor is characterized in that:

Each foil gauge is to including two identical uniaxial strain sheets in the described foil gauge group (2), two the foil gauge longitudinal center line of symmetries axis direction angle parallel with component F that sticks on the same side of elastic body (1) is respectively 45 ° and 135 °, be described the first foil gauge to (22) and the 3rd foil gauge to 1a uniaxial strain sheet (34) in (24), longitudinal center's axis of symmetry of 2a uniaxial strain sheet (36) and X-axis are 45 ° of angles, 1b uniaxial strain sheet (35), longitudinal center's axis of symmetry of 2b uniaxial strain sheet (37) and X-axis are 135 ° of angles; The second foil gauge is 45 ° of angles to (23) and the 4th foil gauge to longitudinal center's axis of symmetry and the Y-axis of 3a uniaxial strain sheet (38), 4a uniaxial strain sheet (40) in (25), and longitudinal center's axis of symmetry and the Y-axis of 3b uniaxial strain sheet (39), 4b uniaxial strain sheet (41) are 135 ° of angles;

The vertical symmetrical center line and the Z direction that stick on two uniaxial strain sheets of eight foil gauge centerings on eight sides of four gussets (5) namely are respectively 45 ° and 135 ° perpendicular to XY in-plane angle.

5. spoke according to claim 3 and centrepin column combination formula three-dimensional force sensor is characterized in that:

Described the first foil gauge forms a resistance bridge to (22) and the 3rd foil gauge to four foil gauges in (24), is formed for measuring the full bridge measurement circuit of X-direction component; The second foil gauge forms a resistance bridge to (23) and the 4th foil gauge to (25), is used for measuring the full bridge measurement circuit of Y direction component.

6. spoke according to claim 3 and centrepin column combination formula three-dimensional force sensor is characterized in that:

Described the 5th foil gauge consists of resistance bridge to (26), the 6th foil gauge to four uniaxial strain sheets in (27), forms a full bridge measurement circuit that is used for measuring Z-direction component; The 7th foil gauge consists of resistance bridge to (28), the 8th foil gauge to four uniaxial strain sheets in (29), forms a full bridge measurement circuit that is used for measuring Z-direction component; The 9th foil gauge consists of resistance bridge to (30), the tenth foil gauge to four uniaxial strain sheets in (31), forms a full bridge measurement circuit that is used for measuring Z-direction component; The 11 foil gauge consists of resistance bridge to (32), the 12 foil gauge to four uniaxial strain sheets in (33), forms a full bridge measurement circuit that is used for measuring Z-direction component;

In parallel to above-mentioned four full bridge measurement circuit input powers that be used for to measure Z-direction component, four positive signal output-parallels in four full bridge measurement circuit form a positive signal and export; With four negative signal output-parallels in four full bridge measurement circuit, form a negative signal output, thereby form a metering circuit in parallel of measuring Z-direction component.

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