Axial force measuring unit and axial force measuring balance

Abstract

The invention relates to an axial force measuring unit and an axial force measuring balance, which are used for solving the problems that a lateral force exists in an existing thrust measuring result and a 45-degree test bed cannot measure part of data. The device comprises a limiting device, a force transmission steel ball and a force sensor, wherein the working surface of the limiting device is provided with a hemispherical groove or a groove with an arc-shaped bottom surface; the force transmission steel ball is located between the working surface of the limiting device and the sensitive surface of the force sensor and is located in the groove; the radius of the hemispherical groove is larger than that of the force transmission steel ball, or the radius of the groove with the semicircular section is larger than that of the force transmission steel ball, or the width of the groove with the oval section is larger than that of the force transmission steel ball. The surface, opposite to the working surface, of the limiting device is a first connecting surface which is used for connecting a measured object; the surface, opposite to the sensitive surface, of the force sensor is a second connecting surface which is used for being connected with a fixed object.

Description

Technical Field

[0001] The invention relates to a force value measuring device, in particular to an axial force measuring unit and an axial force measuring balance. Background Art

[0002] The engine needs to undergo thrust testing during the research and development stage, and the thrust values ​​under various operating conditions need to be obtained during the thrust testing.

[0003] During thrust testing, the engine support frame will deform, resulting in lateral force in the final result of thrust measurement, causing inaccurate measurement results.

[0004] Currently, some engines can only be installed on a test bench installed at a 45° angle. However, some data in the engine thrust test corresponding to this test bench cannot be measured, resulting in the lack of data required for subsequent work and making it impossible to carry out subsequent work. Summary of the invention

[0005] The present invention provides an axial force measuring unit and an axial force measuring balance, which are used to solve the problem of lateral force existing in the current thrust measurement results and the problem that a 45° test bench cannot measure some data.

[0006] During the existing engine test, the engine is rigidly connected to the test bench through a triangular bracket with fixing bolts. In this state, the thrust parameter is accurately measured (eliminating the influence of lateral force). Considering that there are various combustion conditions when the engine is ignited, and the influence is relatively complex, the engine thrust is an extremely important technical indicator. Verifying the thrust design indicator of the engine through test is an important process to ensure the reliability of the engine. This solution eliminates the influence of lateral force introduced by various factors, and finally obtains the accurate measurement result of the engine thrust.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] An axial force measuring unit, which is special in that:

[0009] Including limit device, force transmission steel ball and force sensor:

[0010] The working surface of the limit device is provided with a groove, which is a hemispherical groove or a long strip groove with a semicircular or semi-elliptical cross section; the force-conducting steel ball is located between the working surface of the limit device and the sensitive surface of the force sensor and is located in the groove; the radius of the hemispherical groove is greater than the radius of the force-conducting steel ball, or the radius of the groove with a semicircular cross section is greater than the radius of the force-conducting steel ball, or the width of the groove with an elliptical cross section is greater than the radius of the force-conducting steel ball;

[0011] The surface of the limiting device opposite to the working surface is a first connecting surface, which is used to connect to the object to be measured;

[0012] The surface of the force sensor opposite to the sensitive surface is a second connecting surface, which is used for connecting to a fixed object.

[0013] An axial force measuring balance, which is special in that:

[0014] It includes an upper base, a lower base, and a plurality of axial force measuring units arranged between the upper base and the lower base;

[0015] The axial force measuring unit comprises a limit device, a force conducting steel ball and a force sensor:

[0016] The working surface of the limit device is provided with a groove, which is a hemispherical groove or a long strip groove with a semicircular or semi-elliptical cross section; the force-conducting steel ball is located between the working surface of the limit device and the sensitive surface of the force sensor and is located in the groove; the radius of the hemispherical groove is greater than the radius of the force-conducting steel ball, or the radius of the groove with a semicircular cross section is greater than the radius of the force-conducting steel ball, or the width of the groove with an elliptical cross section is greater than the radius of the force-conducting steel ball;

[0017] The surface of the limiting device opposite to the working surface is the first connecting surface;

[0018] The surface of the force sensor opposite to the sensitive surface is a second connecting surface;

[0019] The first connection surfaces of the plurality of limit devices are all connected to the upper base;

[0020] The second connection surfaces of the plurality of force sensors are all connected to the lower base;

[0021] The upper base is used to connect to the object to be measured;

[0022] The lower base is used for connecting a fixed object.

[0023] Furthermore, it also includes at least two connection components for connecting the upper base and the lower base; the connection components include bolts;

[0024] The tail of the bolt passes through the through hole of the upper base and is screwed to the threaded hole of the lower base; a gap is provided between the bolt and the through hole of the upper base;

[0025] When the force sensor output is zero, the distance between the upper base and the lower base is maximum.

[0026] Furthermore, the connection assembly also includes a limiting nut;

[0027] The limiting nut is arranged on the bolt and is located between the upper base and the lower base;

[0028] When the force sensor output is at its maximum value, the gap between the limit nut and the upper base is 0.

[0029] Furthermore, the connection assembly further comprises a locking nut;

[0030] The locking nut is arranged on the bolt and is used for fixing the bolt on the lower base.

[0031] Furthermore, the upper base and the lower base have the same shape, both of which are circular, annular, square or frame-shaped.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. In the present invention, a force-conducting steel ball is arranged so that only the top of the force-conducting steel ball contacts the limit device, thereby ensuring that the force-conducting steel ball and the force sensor can only be subjected to axial force.

[0034] 2. The present invention is a balance as a whole, which reduces the debugging process of installing a single sensor before testing, reduces the difficulty of installation, and improves the convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the structure of an axial force measurement unit in an embodiment of the present invention;

[0036] Figure 2 It is a structural schematic diagram of an axial force measuring balance in an embodiment of the present invention;

[0037] Figure 3 It is a partial cross-sectional view of the axial force measuring balance in the embodiment of the present invention.

[0038] The specific reference numerals are as follows:

[0039] 1. Limit device; 11. Groove; 2. Force transmission steel ball; 3. Force sensor; 4. Upper base; 5. Lower base; 6. Bolt; 7. Limit nut; 8. Lock nut. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0041] The present invention provides an axial force measuring balance, such as Figure 2 As shown, it includes an upper base 4, a lower base 5 and a plurality of axial force measuring units. The upper base 4 and the lower base 5 are both annular. In other embodiments, the upper base 4 and the lower base 5 may also be square or diamond-shaped or other shapes. The plurality of axial force measuring units may be randomly distributed between the upper base 4 and the lower base 5. In this embodiment, they are evenly distributed. Figure 3As shown, the upper base 4 and the lower base 5 are connected by bolts 6, limit nuts 7 and locking nuts 8. The lower ends of the bolts 6 pass through the upper base 4 and the lower base 5 in sequence, and the lower ends of the bolts 6 are finally screwed into the lower base 5. The limit nuts 7 and locking nuts 8 are arranged on the bolts 6 located on the upper base 4 and the lower base 5 to fix the upper base 4 and the lower base 5.

[0042] Axial force measuring unit Figure 1 As shown, it includes a limit device 1, a force conducting steel ball 2 and a force sensor 3. The limit device 1 and the force sensor 3 are arranged correspondingly, so that the force conducting steel ball 2 is located between the working surface of the limit device 1 and the sensitive surface of the force sensor 3; the working surface of the limit device 1 is provided with a hemispherical groove 11, and in other embodiments, it can also be a long strip groove with a semicircular cross section or a semi-elliptical cross section; the force conducting steel ball 2 is located in the groove 11; the length or diameter of the groove 11 is greater than the radius of the force conducting steel ball 2, so that only the vertex of the conducting steel ball 2 contacts the limit device 1, so that the force can only be transmitted to the conducting steel ball 2 in the axial direction, and the vertex of the conducting steel ball 2 then axially transmits the force to the force sensor 3. Therefore, only the axial force can be measured in the force sensor 3.

[0043] In this embodiment, eight axial force measuring units are evenly arranged along the circumference between the upper base 4 and the lower base 5 .

[0044] The final force is transmitted from the upper base 4 to the lower base 5 through a plurality of limit devices 1, a force conducting steel ball 2 and a force sensor 3 in sequence, and the axial force can be measured on the lower base 5 by a force measuring instrument.

[0045] When the engine is installed on the test bench at an angle of 45°, the thrust F of the engine is equal to the resultant force of the eight axial force sensing units 7 in the axial direction, that is:

[0046] F=F1+F2+F3+F4+F5+F6+F7+F8;

[0047] Among them: F1~F8 are the axial forces measured by 8 axial force measurement units respectively.

Claims

1. An axial force measurement unit, characterized in that: It comprises a limit device (1), a force transmission steel ball (2) and a force sensor (3): The working surface of the limiting device (1) is provided with a groove (11), and the groove (11) is a hemispherical groove or a long strip groove with a semicircular or semi-elliptical cross section; the force-conducting steel ball (2) is located between the working surface of the limiting device (1) and the sensitive surface of the force sensor (3) and is located in the groove; the radius of the hemispherical groove is greater than the radius of the force-conducting steel ball (2), or the radius of the groove with a semicircular cross section is greater than the radius of the force-conducting steel ball (2), or the width of the groove with an elliptical cross section is greater than the radius of the force-conducting steel ball (2); The surface of the limiting device (1) opposite to the working surface is a first connecting surface, which is used to connect to the object to be measured; The surface of the force sensor (3) opposite to the sensitive surface is a second connecting surface, which is used for connecting to a fixed object.

2. An axial force measuring balance, characterized in that: It comprises an upper base (4), a lower base (5), and a plurality of axial force measuring units arranged between the upper base and the lower base; The axial force measuring unit comprises a limit device (1), a force conducting steel ball (2) and a force sensor (3): The working surface of the limit device (1) is provided with a groove (11), and the groove (11) is a hemispherical groove or a long strip groove with a semicircular or semi-elliptical cross section; the force-conducting steel ball (2) is located between the working surface of the limit device (1) and the sensitive surface of the force sensor (3) and is located in the groove; the radius of the hemispherical groove is greater than the radius of the force-conducting steel ball (2), or the radius of the groove with a semicircular cross section is greater than the radius of the force-conducting steel ball (2), or the width of the groove with an elliptical cross section is greater than the radius of the force-conducting steel ball (2); The surface of the limiting device (1) opposite to the working surface is a first connecting surface; The surface of the force sensor (3) opposite to the sensitive surface is a second connecting surface; The first connection surfaces of the plurality of limit devices (1) are all connected to the upper base (4); The second connection surfaces of the plurality of force sensors (3) are all connected to the lower base (5); The upper base (4) is used to connect to the object to be measured; The lower base (5) is used for connecting a fixed object.

3. An axial force measuring balance according to claim 2, characterized in that: It also includes at least two connection components for connecting the upper base (4) and the lower base (5); the connection components include bolts (6); The tail of the bolt (6) passes through the through hole of the upper base (4) and is screwed to the threaded hole of the lower base (5); a gap is provided between the bolt (6) and the through hole of the upper base (4); When the output of the force sensor (3) is zero, the distance between the upper base (4) and the lower base is maximum.

4. An axial force measuring balance according to claim 3, characterized in that: The connecting assembly also includes a limiting nut (7); The limiting nut (7) is arranged on the bolt (6) and is located between the upper base (4) and the lower base (5); When the output of the force sensor (3) is at a maximum value, the gap between the limit nut (7) and the upper base (4) is zero.

5. An axial force measuring balance according to claim 3 or 4, characterized in that: The connecting assembly also includes a locking nut (8); The locking nut (8) is arranged on the bolt (6) and is used to fix the bolt (6) on the lower base (5).

6. An axial force measuring balance according to claim 5, characterized in that: The upper base (4) and the lower base (5) have the same shape, and are both circular, annular, square or frame-shaped.

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