CN220982511U - Device for measuring dynamic axial tension and compression force - Google Patents

Abstract

The utility model provides a device for measuring dynamic axial tension and compression force, which comprises: the first side output shaft and the second side input shaft of the vertical support arm of the L-shaped force reversing device are respectively suitable for mounting a tested piece and a motor, and the first end of the transverse support arm is hinged with the first bracket; the pull pressure measuring assembly comprises N first force sensors, wherein the first ends of the N first force sensors are respectively hinged with the second ends of the transverse support arms, the second ends of the N first force sensors are respectively hinged with N second supports, and the axes of the N first force sensors are perpendicular to the first side output shaft. The device for measuring dynamic axial tension and pressure measures the tension and pressure in the axial direction by an indirect force measuring method while the shaft rotates on the basis of using a contact force sensor, thereby ensuring the measuring accuracy and the economical efficiency.

Description

Device for measuring dynamic axial tension and compression force

Technical Field

The utility model relates to the field of axial force measurement, in particular to a device for measuring dynamic axial tension and compression force.

Background

The comprehensive test bed for propeller is a test bed for testing the relation between axial propelling force and shaft work of various propellers under different working conditions (such as the conditions of pitch, incoming flow speed and the like). In the test of aviation propellers and marine propellers, it is necessary to measure the axial force (including tensile force and pressure force) in the upper axis direction of the propeller blades after the blades act with working media while the blades rotate. The traditional testing means have the conditions of low precision, difficult calibration and the like for the application of 'measuring shaft work and simultaneously accurately measuring and checking axial force'.

In the existing force measuring mechanism, various precise non-contact sensors are mostly used, however, non-contact instruments for measuring axial tension on a rotating shaft system are far less economical and accurate than contact force sensors, the equipment is expensive and difficult to install, additional radio acquisition or other acquisition equipment is needed, and meanwhile, the pure tension value is difficult to directly read because tension, torque and shaft bending moment coexist. The existing guide rail movable force measuring mechanism using the contact force sensor has the defects that axial force is inconsistent with a measuring axis, guide rail friction errors, uneven force caused by cantilever blade installation and the like.

Disclosure of utility model

Aiming at the problems in the prior art, the utility model provides a novel device for measuring dynamic axial tension and compression force. The device for measuring dynamic axial tension and pressure measures the tension and pressure in the axial direction by an indirect force measuring method while the shaft rotates on the basis of using a contact force sensor, thereby ensuring the measuring accuracy and the economical efficiency.

Specifically, the utility model provides a device for measuring dynamic axial tension pressure, which comprises:

The L-shaped force reversing device comprises a transverse support arm and a vertical support arm, a first side output shaft of the vertical support arm is suitable for mounting a rotating shaft of a tested piece, a second side input shaft is suitable for being connected with a motor, and a first end of the transverse support arm is hinged with a first bracket;

The tension and pressure measurement assembly comprises N first force sensors, wherein first ends of the N first force sensors are respectively hinged with second ends of the transverse support arms, second ends of the N first force sensors are respectively hinged with N second supports, axes of the N first force sensors are perpendicular to the first side output shaft, and N is an integer greater than or equal to 1.

According to one embodiment of the present utility model, in the apparatus for measuring dynamic axial tension pressure described above, the apparatus further comprises a tension-pressure calibration assembly, the tension-pressure calibration assembly includes a second force sensor and a force loading unit, a first end of the second force sensor is connected to the vertical support arm, a second end of the second force sensor is hinged to a first end of the force loading unit, a second end of the force loading unit is hinged to a second bracket, and the second force sensor, the force loading unit and a first side output shaft of the vertical support arm are coaxial;

according to an embodiment of the present utility model, in the above device for measuring dynamic axial tension and compression force, the tension and compression force calibration assembly is detachably hinged with the vertical support arm.

According to an embodiment of the present utility model, in the above device for measuring dynamic axial tension pressure, a first vertical distance from a hinge point of the vertical support arm and the lateral support arm to a first side output shaft of the vertical support arm is equal to a second vertical distance from the hinge point to a second end of the lateral support arm.

According to an embodiment of the present utility model, in the above device for measuring dynamic axial tension pressure, the vertical support arm is a central bearing or a parallel axis gear machine; or the vertical support arm is provided with a central bearing or a parallel axis gear machine.

According to an embodiment of the present utility model, in the apparatus for measuring dynamic axial tension pressure, N is 1, and the first end of the first force sensor is hinged at a midpoint of the second end of the transverse arm.

According to an embodiment of the present utility model, in the apparatus for measuring dynamic axial tension pressure, N is greater than 1, and first ends of the N first force sensors are equally spaced and hinged to second ends of the transverse arms.

According to an embodiment of the present utility model, in the apparatus for measuring dynamic axial tension pressure, the test piece is a propeller.

According to an embodiment of the present utility model, in the above device for measuring dynamic axial tension pressure, the calibration force loading unit is a hydraulic force loader or an electric force loader.

According to an embodiment of the present utility model, in the above-mentioned apparatus for measuring dynamic axial tension pressure, the second force sensor is configured to detect, in a calibration state, a value of a different first calibration force applied thereto by the force loading unit;

The N first force sensors are used for detecting the values of corresponding second calibration forces born by the force loading unit when the force loading unit applies different calibration forces to the first force sensors in a calibration state, and detecting the values of the forces to be calibrated born by the tested piece under different working conditions in a test state;

The target value of the axial force of the tested piece under different working conditions is obtained by calibrating the value of the force to be verified through the corresponding relation between the value of the first calibration force and the value of the second calibration force.

It is to be understood that both the foregoing general description and the following detailed description of the present utility model are exemplary and explanatory and are intended to provide further explanation of the utility model as claimed.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model. In the accompanying drawings:

Fig. 1 is a schematic view of a test state of an apparatus for measuring dynamic axial tension pressure according to the present utility model.

Fig. 2 is a schematic illustration of the calibration state of the device for measuring dynamic axial tension pressure according to the utility model.

Reference numerals illustrate:

propeller 10

L-shaped force reversing device 11

Transverse arm 12

Vertical support arm 13

First side output shaft 131

Second side input shaft 132

Pulling pressure calibration assembly 14

Second force sensor 141

Force loading unit 142

Pulling pressure measuring assembly 15

First force sensor 151

First support 16

Third support 17

Second support 18

Foundation 19

Detailed Description

Embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to the preferred embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Furthermore, although terms used in the present utility model are selected from publicly known and commonly used terms, some terms mentioned in the present specification may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Furthermore, it is required that the present utility model is understood, not simply by the actual terms used but by the meaning of each term lying within.

The basic principle and preferred embodiments of the present utility model will be discussed in more detail with reference to the accompanying drawings. The device for measuring dynamic axial tension and compression force has a calibration state and a test state.

First, referring to fig. 1, there is a schematic diagram of the experimental state of the apparatus for measuring dynamic axial tension pressure of the present utility model. As shown in fig. 1, the test state of the device for measuring dynamic axial tension and compression force of the utility model mainly comprises an L-shaped force reversing device 11 and a tension and compression force measuring assembly 15.

In particular, the L-shaped force reversing device 11 comprises a transverse arm 12 and a vertical arm 13. Wherein the first side output shaft 131 of the vertical support arm 13 is suitable for mounting the rotating shaft of the tested piece and the second side input shaft 132 is suitable for being connected with a motor, and the first end of the horizontal support arm 12 is hinged with the first bracket 16. Preferably, the hinge point of the first end of the transverse arm 12 and the first bracket 16 is on the intersection line of the transverse arm 12 and the vertical arm 13.

Preferably, the first side output shaft 131 of the vertical support arm 13 may be connected to a shaft flange of the tested piece, and the second side input shaft 132 of the vertical support arm 13 is connected to a shaft flange of the motor.

Preferably, the first vertical distance from the hinge point of the vertical arm 13 and the horizontal arm 12 to the first side output shaft of the vertical arm (13) is equal to the second vertical distance from the hinge point to the second end of the horizontal arm 12. Furthermore, in some embodiments, the first vertical distance and the second vertical distance may also be unequal, but need to be in a predetermined ratio for subsequent calibration calculations.

Further, in a preferred embodiment, the vertical arm 13 is a center bearing or a parallel axis gear machine. In another preferred embodiment, the vertical support arm 13 is provided with a central bearing or a parallel axis gear machine, for example, the vertical support arm 13 further includes a frame body for mounting or placing the central bearing or the parallel axis gear machine in addition to the central bearing or the parallel axis gear machine.

The test piece according to the present utility model may be any component or device having a rotating shaft and requiring measurement of dynamic axial tension, such as the propeller 10 shown in fig. 1. The propeller 10 may be an aviation propeller, a marine propeller, or the like.

Further, the pull pressure measuring assembly 15 includes N first force sensors 151. Wherein, the first ends of the N first force sensors 151 are respectively hinged with the second ends of the transverse support arms 12, the second ends of the N first force sensors 151 are respectively hinged with the N second brackets 18, and the axes of the N first force sensors 151 are perpendicular to the first side output shaft 131.

Wherein N is an integer greater than or equal to 1. In particular, N may be equal to 1, i.e., the pull pressure measurement assembly 15 may include a first force sensor 151 with a first end of the first force sensor 151 hinged at a midpoint of the second end of the transverse arm 12. N may be any integer greater than 1, that is, the pull pressure measuring assembly 15 may also include a plurality of first force sensors 151, where first ends of the plurality of first force sensors 151 are respectively hinged to second ends of the transverse support arm 12, so as to improve measurement accuracy. Also, the first ends of the plurality of first force sensors 151 are preferably equally spaced apart from each other at the second ends of the transverse arms 12.

As described above, the utility model eliminates the way of the guide rail movable force measuring mechanism, utilizes the L-shaped force reversing device to convert the axial force into the force perpendicular to the axial direction through the hinge, and can measure the pulling/pressure in the axial direction by using the indirect force measuring method while the shaft rotates, thereby avoiding the problems of inconsistent axial force and measuring axis, uneven force caused by guide rail friction errors and cantilever installation paddles and the like which possibly occur in guide rail force measurement, and greatly improving the measuring precision of the pulling/pressure in the axial direction.

To further improve the measurement accuracy, a pull pressure calibration assembly 14 is added to the L-shaped force reversing device 11 and the pull pressure measurement assembly 15, turning to fig. 2.

Specifically, as shown in FIG. 2, the pull pressure calibration assembly 14 includes a second force sensor 141 and a force loading unit 142. Wherein a first end of the second force sensor 141 is connected to the vertical support arm 13, a second end of the second force sensor 141 is hinged to a first end of the force loading unit 142, a second end of the force loading unit 142 is hinged to the third bracket 17, and the second force sensor 141, the force loading unit 142 and the first side output shaft 131 of the vertical support arm 13 are coaxial.

Further, the force loading unit 142 described above may be any type of force loader, such as, but not limited to, a hydraulic force loader or an electric force loader.

Preferably, the pull pressure calibration assembly 14 is detachably hinged to the vertical arm 13. For example, in the test state of FIG. 1, the pull pressure calibration assembly 14 is installed or opened. And in the fig. 2 calibration state, the pull pressure calibration assembly 14 is disassembled or shut off (as in fig. 1).

In the embodiment shown in fig. 1, the second force sensor 141 is configured to detect, in a calibration state, a value of a different first calibration force applied thereto by the force loading unit 142; the N first force sensors 151 are used to detect the values of the corresponding second calibration forces that the force loading unit 142 receives when applying different calibration forces to the second force sensor 141 in the calibration state, and to detect the values of the forces to be calibrated that the test piece receives under different working conditions in the test state. The target value of the axial force of the tested piece under different working conditions is obtained by calibrating the force value to be calibrated through the corresponding relation between the value of the first calibration force and the value of the second calibration force.

In addition, the device for measuring dynamic axial tension pressure of the utility model preferably further comprises a verification process after calibration and before test. For example, in one embodiment, the first sensor 151 may be self-calibrated, e.g., after mounting the propeller, the force sensor pulling the pressure measurement assembly 15 may have a reading due to the cantilever mounting of the propeller, and the reading is cleared to complete the calibration. In another embodiment, the second sensor 141 of the pull pressure calibration assembly 14 is used to check the first sensor 151 of the pull pressure test assembly, and after mounting the propeller and installing the pull pressure calibration assembly 14, the readings of the first sensor 151 and the second sensor 141 in the check state should be the same if the first vertical distance and the second vertical distance are equal.

In the embodiment of fig. 1 and 2 of the present utility model, the first bracket 16 and the second bracket 18 are fixed to the base 19, and the third bracket 17 is fixed to the first mount. In addition, in order to make the motor coaxially connected with the vertical bracket, the motor can be lifted by a second fixing frame arranged on the foundation 19.

For a better understanding of the present technical solution, the checksum test procedure of the device for measuring dynamic axial tension pressure according to the present utility model is described in detail below with reference to fig. 1 and 2: first, as shown in fig. 1, after the propeller 10 is mounted on the parallel axis gear machine (or the intermediate bearing), the second force sensor 141 connected to the parallel axis is applied with a calibrated axial force (denoted as set { C }) to the second force sensor 141 by the hydraulic or electric loading unit mounted thereafter, the axial force being identical to the force (denoted as set { T }) applied by the propeller 10 on the gear box (or the intermediate bearing) at the time of the formal test, that is { T = { C }; then, the value [ C ] of the second force sensor 141 is read at different calibration force magnitudes while the reading [ R ] of the first force sensor 151 is recorded, with C belonging to the set { C } being [ C ] ∈ { C } and R belonging to the set { R } being R ε { R }. Since any R is a reading obtained under different axial forces of C, by recording different sets of data records, a mapping table of values of { R } and any axial force, i.e., { C } → { R }, can be obtained. Because { T = { C }, so far, a mapping table between the reading set { R } of the first force sensor 151 and any axial force { T } can be obtained and is recorded as { R } → { T }; finally, as shown in fig. 2, after the second force sensor 141 is disconnected, a formal test can be performed on the tested piece, the readings of the first force sensor 151 of the mounted propeller 10 under different working conditions (such as the incoming flow speed of the aviation propeller 10, the pitch and the rotation speed of the propeller 10) are recorded, and the value of the axial force of the propeller 10 under different working conditions can be measured by comparing the mapping table { R } → { T }.

In summary, the utility model provides a device for measuring dynamic axial tension and compression force with a brand new structure. The device for measuring dynamic axial tension pressure utilizes the L-shaped force reversing device, and converts axial force into force perpendicular to the axial direction through the hinge, and can measure tension/pressure in the axial direction when the shaft rotates by using an indirect force measuring method, so that the problems that the axial force is inconsistent with a measuring axis, the friction error of the guide rail, the uneven force caused by the installation of the blade on the cantilever and the like possibly occurring in guide rail type force measurement are avoided, and the measuring precision of the tension/pressure in the axial direction is greatly improved. Furthermore, the calibration sensor of the pull pressure measurement assembly is calibrated by the pull pressure calibration assembly, so that the value of the working axial force of the propeller in the test state can not be error caused by the friction force among mechanisms, namely, the final measurement value is obtained by calibrating the reading of the second force sensor through the first force sensor parallel to the axis, and the economical efficiency of the measurement device is also ensured under the condition of ensuring the measurement precision. In addition, the contact force sensor with high precision and high reliability can work normally under severe working conditions, and the maintenance cost is low.

It will be apparent to those skilled in the art that various modifications and variations can be made to the above-described exemplary embodiments of the present utility model without departing from the spirit and scope of the utility model. Therefore, it is intended that the present utility model cover the modifications and variations of this utility model provided they come within the scope of the appended claims and their equivalents.

Claims (10)

1. An apparatus for measuring dynamic axial tension pressure, comprising:

the L-shaped force reversing device (11), the L-shaped force reversing device (11) comprises a transverse support arm (12) and a vertical support arm (13), a first side output shaft (131) of the vertical support arm (13) is suitable for mounting a rotating shaft of a tested piece, a second side input shaft (132) is suitable for being connected with a motor, and a first end of the transverse support arm (12) is hinged with a first bracket (16);

The tension and pressure measurement assembly (15), the tension and pressure measurement assembly (15) comprises N first force sensors (151), first ends of the N first force sensors (151) are respectively hinged with second ends of the transverse support arms (12), second ends of the N first force sensors (151) are respectively hinged with N second supports (18), and axes of the N first force sensors (151) are perpendicular to the first side output shaft (131), and N is an integer greater than or equal to 1.

2. The device for measuring dynamic axial tension pressure according to claim 1, further comprising a tension pressure calibration assembly (14), said tension pressure calibration assembly (14) comprising a second force sensor (141) and a force loading unit (142), a first end of said second force sensor (141) being connected to said vertical support arm (13), a second end of said second force sensor (141) being hinged to a first end of said force loading unit (142), a second end of said force loading unit (142) being hinged to a third support (17), said second force sensor (141), said force loading unit (142) and a first side output shaft (131) of said vertical support arm (13) being coaxial.

3. Device for measuring dynamic axial tension and compression forces according to claim 2, characterized in that the tension and compression force calibration assembly (14) is detachably hinged to the vertical arm (13).

4. Device for measuring dynamic axial tension pressure according to claim 1 or 2, wherein the first vertical distance from the hinge point of the vertical arm (13) and the lateral arm (12) to the first side output shaft of the vertical arm (13) and the second vertical distance from the hinge point to the second end of the lateral arm (12) are equal.

5. Device for measuring dynamic axial tension pressure according to claim 1 or 2, characterized in that the vertical arm (13) is a central bearing or a parallel axis gear machine; or the vertical arm (13) is provided with a central bearing or a parallel axis gear machine.

6. A device for measuring dynamic axial tension pressure as claimed in claim 1 or 2, wherein N is 1, and the first end of the first force sensor (151) is hinged at a midpoint of the second end of the transverse arm (12).

7. Device for measuring dynamic axial tension pressure according to claim 1 or 2, wherein N is greater than 1, the first ends of the N first force sensors (151) being equally spaced hinged at the second ends of the transversal arms (12).

8. Device for measuring dynamic axial tension pressure according to claim 1 or 2, wherein the tested piece is a propeller (10).

9. The device for measuring dynamic axial tension pressure according to claim 2, wherein the force loading unit (142) is a hydraulic force loader or an electric force loader.

10. The device for measuring dynamic axial pull pressure according to claim 2, wherein the second force sensor (141) is adapted to detect, in a calibrated state, the value of a first, different calibration force applied thereto by the force loading unit (142);

The N first force sensors (151) are used for detecting the values of corresponding second calibration forces born by the force loading unit (142) when different calibration forces are applied to the second force sensors (141) in a calibration state, and detecting the values of the forces to be verified born by the tested piece under different working conditions in a test state;

The target value of the axial force of the tested piece under different working conditions is obtained by calibrating the value of the force to be verified through the corresponding relation between the value of the first calibration force and the value of the second calibration force.