Torsion limiting assembly of leaf spring type torque measuring device

Abstract

The invention discloses a torsion limiting assembly of a leaf spring type torque measuring device, which comprises a mounting bottom plate, two groups of fixed supporting columns and floating connecting blocks which are symmetrically arranged, four groups of pressing plates and two groups of leaf springs, and the two groups of fixed supporting columns which are vertically arranged are symmetrically mounted on the two sides of the mounting bottom plate; the blades are symmetrically distributed at the front and back of a main blade of the device along the measuring axis direction of the blade static moment measuring device, and are respectively arranged at two sides of a main beam along the direction vertical to the measuring axis. One end of each floating connecting block is rigidly connected with the main beam, the other end of each floating connecting block is elastically coupled with the corresponding fixed supporting column through a leaf spring, and the two floating connecting blocks are symmetrically distributed on the main blade front and back in the measuring axis direction, are opposite to the fixed supporting columns on the same side front and back and are located on the two sides of the main beam in the direction perpendicular to the measuring axis; the two sets of leaf springs are clamped and fixed through four sets of pressing plates, two sets of pressing plates are connected with the fixed supporting column, and the other two sets of pressing plates are connected with the floating connecting block. The limiting problem of the blade static moment measuring equipment can be solved.

Description

Technical Field

[0001] This invention belongs to the field of precision measuring equipment technology, specifically relating to a torsional limiting component of a leaf spring type torque measuring device. Background Technology

[0002] Force transmission and limiting technology in blade static moment measurement devices is a core component of precision blade measurement in fields such as aero-engines and wind power generation, and its performance directly affects measurement accuracy and equipment stability. Currently, most such devices rely on balance structures, using a fulcrum blade assembly as the core of force transmission, transmitting torque through the contact between the blade edge and the bearing. In non-measurement conditions (such as blade loading / unloading, fixture replacement, etc.), existing blade static moment measurement devices are susceptible to displacement deviations due to external forces affecting the main beam and fulcrum blade assembly. To address this issue, some technical solutions add a main beam lifting drive mechanism to disengage the fulcrum blade edge from the bearing when not in operation, thus avoiding mechanical damage. However, this lifting adjustment needs to be repeated before and after each measurement, resulting in cumbersome operation, slow response, and a significant reduction in measurement efficiency.

[0003] Furthermore, the opening angle of a conventional tool bearing groove is typically larger than the design value of the fulcrum tool's cutting edge angle. While this reduces the accuracy requirements for installation alignment, it can cause the main beam to passively sway along the X-direction during actual measurements. Existing technologies often employ rigid limiting structures to forcibly constrain this displacement. Although this can suppress mechanical vibration, excessive constraint reaction forces can interfere with the linear transmission of the measurement torque, causing force decoupling errors. Especially in high-precision measurement scenarios, the compatibility contradiction between rigid limiting and flexible force transmission becomes more prominent, making it difficult to simultaneously meet the dual requirements of positioning stability and force transmission fidelity. Summary of the Invention

[0004] The purpose of this invention is to provide a torsional limiting component for a leaf spring type torque measuring device, which can solve the limiting problem of blade static torque measuring equipment.

[0005] To achieve the above objectives, one aspect of the present invention provides a torsional limiting assembly for a leaf spring-type torque measuring device, used for limiting the static torque of a blade measuring device, comprising a mounting base plate, two sets of symmetrically arranged fixed support columns and floating connecting blocks, four sets of clamping plates, and two sets of leaf springs.

[0006] The mounting base plate is a rectangular rigid base, which is installed on the base of the blade static moment measuring device. Two sets of vertically arranged fixed support columns are symmetrically installed on both sides. The two sets of fixed support columns are symmetrically distributed in front of and behind the main blade of the blade static moment measuring device along the measuring axis of the blade static moment measuring device, and located on both sides of the main beam of the blade static moment measuring device along the measuring axis perpendicular to the measuring axis of the blade static moment measuring device.

[0007] One end of the floating connecting block is rigidly connected to the main beam of the blade static moment measuring device, and the other end is elastically coupled to the fixed support column through a leaf spring. The two sets of floating connecting blocks are symmetrically distributed in front of and behind the main blade of the blade static moment measuring device along the measuring axis direction of the blade static moment measuring device, and opposite to the front and back of the fixed support column on the same side. They are located on both sides of the main beam of the blade static moment measuring device along the measuring axis direction perpendicular to the blade static moment measuring device.

[0008] The two sets of leaf springs are clamped and fixed by four sets of clamping plates, two of which are connected to the fixed support column, and the other two are connected to the floating connecting block.

[0009] Preferably, two sets of clamping plates are bolted to the fixed support column, and the other two sets of clamping plates are bolted to the floating connecting block. The four sets of clamping plates apply a controllable clamping force through the pre-tightening bolts to ensure that the installation pre-tightening amount of the leaf spring is adjustable.

[0010] Preferably, both sets of leaf springs are arranged horizontally along the X-axis. The swing driving force of the main beam along the X-axis is transmitted through the axial elastic deformation of the leaf springs. The bending stiffness of the horizontal leaf springs in the Y-axis direction inhibits the forward and backward movement of the main beam. The symmetrical layout of the two sets of horizontal leaf springs forms torsional stiffness. When the main beam is subjected to external torque, the leaf springs undergo reverse shear deformation, which limits the torsional angle of the main beam around the Z-axis to within the allowable range.

[0011] Preferably, the tops of the two sets of fixed support columns are parallel and coplanar, and the upper surface of the floating connecting block is parallel and coplanar with the top surface of the fixed support columns.

[0012] Preferably, the fixed support column is made of stainless steel or hard aluminum, and the floating connecting block is made of hard aluminum.

[0013] Preferably, the leaf spring and the main cutting edge of the blade static torque measuring device are located on the same plane.

[0014] Preferably, the leaf spring has a thickness of 0.2 to 0.5 mm and is made of beryllium bronze.

[0015] Preferably, the mounting base plate is made of high-strength aluminum alloy or stainless steel.

[0016] According to the torsional limiting assembly of the leaf spring type torque measuring device of the present invention described above, the limiting problem of blade static torque measuring equipment can be solved. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort:

[0018] Figure 1 This is a top view of the structural composition of the torsion limiting assembly of a leaf spring type torque measuring device according to an embodiment of the present invention;

[0019] Figure 2 This is an isometric side view of the torsion limiting assembly of a leaf spring type torque measuring device according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the torsion limit assembly of a leaf spring type torque measuring device according to an embodiment of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0022] One embodiment of the present invention provides a torsional limiting assembly for a leaf spring type torque measuring device, used for limiting the static torque measuring device of a blade, such as... Figure 1-3 As shown, the torsional limiting component of the leaf spring type torque measuring device in this embodiment of the invention includes a mounting base plate 5, a fixed support column 1, a floating connecting block 3, a pressing plate 4, and a leaf spring 2. Its core is to achieve decoupling control of multi-degree-of-freedom constraints and force transmission through the elastic deformation of the leaf spring 2.

[0023] The mounting base plate 5 is a rectangular rigid base that is installed on the foundation (base) of the blade static moment measuring device. Two sets of vertically arranged fixed support columns 1 are symmetrically bolted on both sides of the base plate to provide the bearing reference for the overall assembly. The tops of the two sets of fixed support columns 1 are parallel and coplanar.

[0024] Two sets of fixed support columns 1 are symmetrically distributed in front of and behind the main blade of the blade static moment measuring device along the measuring axis direction of the blade static moment measuring device; and on both sides of the main beam of the blade static moment measuring device along the measuring axis direction perpendicular to the blade static moment measuring device. Preferably, the fixed support columns 1 are made of stainless steel or hard aluminum.

[0025] The floating connecting block 3 consists of two sets of symmetrically arranged transition connectors. One end of the floating connecting block 3 is rigidly connected to the main beam 6 of the blade static moment measuring device via bolts, while the other end is elastically coupled to the fixed support column 1 via leaf spring 2. After installation, the upper surface of the floating connecting block 3 is parallel and coplanar with the top surface of the fixed support column 1.

[0026] Two sets of floating connecting blocks 3 are symmetrically distributed in front of and behind the main blade of the blade static moment measuring device along the measuring axis direction, and opposite to the front and back of the fixed support column 1 on this side; they are located on both sides of the main beam of the blade static moment measuring device along the measuring axis direction perpendicular to the measuring axis direction. Preferably, the floating connecting blocks 3 are made of hard aluminum.

[0027] The leaf spring 2 is clamped and fixed by four sets of clamping plates 4. Two sets of clamping plates 4 are bolted to the fixed support column 1, and the other two sets of clamping plates 4 are bolted to the floating connecting block 3. A controllable clamping force is applied by pre-tightening bolts to ensure that the installation pre-tightening amount of the leaf spring 2 is adjustable. Both sets of leaf springs 3 are arranged horizontally along the X-axis, and their extension direction is consistent with the swing direction (X-axis) of the measuring main beam 6. The bending stiffness of the horizontal leaf springs 3 in the Y-axis direction inhibits the back-and-forth movement of the main beam 6; the symmetrical layout of the two sets of horizontal leaf springs 3 forms torsional stiffness. When the main beam 6 is subjected to external torque, the leaf springs 3 undergo reverse shear deformation, limiting the torsional angle around the Z-axis to within the allowable range.

[0028] As a preferred option, the leaf spring 3 has a thickness of 0.2 to 0.5 mm, is made of beryllium bronze, has an elastic modulus of 110 to 130 GPa, and a yield strength of ≥1000 MPa, and has both high elasticity and fatigue resistance.

[0029] The swing driving force of the main beam 6 along the X-axis is transmitted through the axial elastic deformation of the leaf spring 3, while the interference force in the Z-axis direction is isolated by the lateral stiffness of the leaf spring 3. When the main beam 6 is subjected to the impact of blade loading and unloading, the leaf spring 2 absorbs energy through elastic deformation and automatically resets after unloading due to the superelastic properties of beryllium bronze.

[0030] In one embodiment, a rectangular mounting base plate 5 is fabricated using high-strength aluminum alloy (such as 6061-T6) or stainless steel, with a surface flatness ≤0.01mm. Two sets of fixed support columns 1 are symmetrically installed on both sides of the base plate, with a verticality error ≤0.005mm, and the parallelism of the two sets of support columns is ensured to be ≤0.02mm by laser calibration. Two sets of symmetrical bolt holes are machined on the top surface of the support columns for subsequent installation of the clamping plate 4. The floating connecting block 3 is rigidly connected to the main beam 6 of the measuring device by bolts. Two beryllium bronze leaf springs 2 are used, with dimensions of: length × width × thickness = 60mm × 30mm × 0.3mm, and the surface is electrolytically polished. The leaf springs are arranged along the X-axis, with one end placed above the fixed support column 1 and clamped by the clamping plate 4, and the other end placed above the floating connecting block 3 and clamped by another clamping plate 4. After installation, the flatness of the leaf spring 2 is checked using a dial indicator to ensure that the flatness error of the leaf spring after clamping is ≤0.02mm. Mechanical limit blocks are installed at the extreme swing position of the main beam 6 of the device to prevent the leaf spring from being overloaded and deformed.

[0031] When the blade measuring fixture 7 is bolted to the measuring end of the main beam 6, and then the blade to be measured 8 is mounted on the measuring end of the blade measuring fixture 7 for measurement, the main beam will experience displacement and torsion due to the bolt installation, the weight of the fixture, and the weight of the blade. At this time, the leaf spring can suppress the X-direction displacement and the torsion around the Z-axis in the horizontal direction. When the blade to be measured 8 is mounted and enters the measurement state, the Z-direction displacement caused by the blade's gravity, i.e., the torsion of the main beam 6 around the Y-axis, is not affected, thereby transmitting the static moment of the blade. Actual measurements using a static moment measuring device for a certain type of aero-engine blade show that after adopting this limiting component:

[0032] 1. The maximum permissible error of the device is guaranteed to be 0.05%M (M is the measured value, and the unit is gm), which is at the leading level in China;

[0033] 2. The sensitivity limit of the device is 20 g / mm, which is only 0.01% of the device's range, making it a leading device in China.

[0034] 3. Significantly reduced blade wear rate and improved blade measurement efficiency.

[0035] According to the above embodiment of the leaf spring type torque measuring device torsion limiting assembly of the present invention, the fixed support column is vertically fixed on both sides of the mounting base plate, one end of the floating connecting block is rigidly connected to the main beam, and the other end is connected to the fixed support column through two sets of parallel leaf springs. Four sets of clamping plates are clamped and fixed between the fixed support column and the floating connecting block using pre-tightened bolts. Through the elastic deformation characteristics of the leaf spring, constraints are formed in the X and Y axis translation and the torsion direction around the Z axis, while allowing the lossless transmission of the measuring force in the X axis direction. The limiting assembly of the present invention can adapt to installation misalignment errors and ensure the positioning accuracy of the main blade under blade loading and unloading, fixture replacement and other external vibration or impact conditions. Compared with the traditional rigid limiting structure, the present invention has both positioning stability and force transmission sensitivity, and has no risk of mechanical wear, making it particularly suitable for high-precision scenarios such as static torque measurement of aerospace blades.

[0036] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A torsional limiting assembly for a leaf spring type torque measuring device, used for limiting the static torque of a blade measuring device, characterized in that, This includes a mounting base plate, two sets of symmetrically arranged fixed support columns and floating connecting blocks, four sets of clamping plates, and two sets of leaf springs. The mounting base plate is a rectangular rigid base, which is installed on the base of the blade static moment measuring device. Two sets of vertically arranged fixed support columns are symmetrically installed on both sides. The two sets of fixed support columns are symmetrically distributed in front of and behind the main blade of the blade static moment measuring device along the measuring axis of the blade static moment measuring device, and located on both sides of the main beam of the blade static moment measuring device along the measuring axis perpendicular to the measuring axis of the blade static moment measuring device. One end of the floating connecting block is rigidly connected to the main beam of the blade static moment measuring device, and the other end is elastically coupled to the fixed support column through a leaf spring. The two sets of floating connecting blocks are symmetrically distributed in front of and behind the main blade of the blade static moment measuring device along the measuring axis direction of the blade static moment measuring device, and opposite to the front and back of the fixed support column on the same side. They are located on both sides of the main beam of the blade static moment measuring device along the measuring axis direction perpendicular to the blade static moment measuring device. The two sets of leaf springs are clamped and fixed by four sets of clamping plates, two of which are connected to the fixed support column, and the other two are connected to the floating connecting block.

2. The torsional limiting assembly of the leaf spring type torque measuring device as described in claim 1, characterized in that, Two sets of clamping plates are bolted to the fixed support column, and the other two sets of clamping plates are bolted to the floating connecting block. The four sets of clamping plates apply controllable clamping force through the pre-tightening bolts to ensure that the installation pre-tightening amount of the leaf spring is adjustable.

3. The torsional limiting assembly of the leaf spring type torque measuring device as described in claim 1 or 2, characterized in that, Both sets of leaf springs are arranged horizontally along the X-axis. The oscillating driving force of the main beam along the X-axis is transmitted through the axial elastic deformation of the leaf springs. The bending stiffness of the horizontal leaf springs in the Y-axis direction inhibits the forward and backward movement of the main beam. The symmetrical layout of the two sets of horizontal leaf springs forms torsional stiffness. When the main beam is subjected to external torque, the leaf springs undergo reverse shear deformation, which limits the torsional angle of the main beam around the Z-axis to within the allowable range.

4. The torsional limiting assembly of the leaf spring type torque measuring device as described in claim 1 or 2, characterized in that, The tops of the two sets of fixed support columns are parallel and coplanar, and the upper surface of the floating connecting block is parallel and coplanar with the top surface of the fixed support columns.

5. The torsional limiting assembly of the leaf spring type torque measuring device as described in claim 1 or 2, characterized in that, The fixed support column is made of stainless steel or hard aluminum, and the floating connecting block is made of hard aluminum.

6. The torsional limiting assembly of the leaf spring type torque measuring device as described in claim 1 or 2, characterized in that, The leaf spring and the main cutting edge of the blade static torque measuring device are located on the same plane.

7. The torsional limiting assembly of the leaf spring type torque measuring device as described in claim 1 or 2, characterized in that, The leaf spring has a thickness of 0.2 to 0.5 mm and is made of beryllium bronze.

8. The torsional limiting assembly of the leaf spring type torque measuring device as described in claim 1 or 2, characterized in that, The mounting base plate is made of high-strength aluminum alloy or stainless steel.

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