A testing machine coaxiality calibration device

Abstract

The utility model discloses a testing machine coaxial degree calibrating device. Including the testing machine main part, the testing machine crossbeam, the testing machine upper / lower stress point, the testing machine base, the upper stress point clamping fixed part and the lower stress point clamping fixed part, the testing machine main part top is provided with the testing machine crossbeam, testing machine crossbeam is connected with the testing machine upper stress point down, the testing machine base top is provided with the testing machine lower stress point, the upper stress point clamping fixed part and the lower stress point clamping fixed part are connected with the testing machine upper stress point, the testing machine lower stress point respectively. The utility model discloses calibrating device measurement traceability simple and convenient, through detecting the coaxial degree of the device at different specifications and sizes stress point, can guarantee the accuracy of the utility model device calibrating method, can reduce the uncertain factor of the measurement result of the influence of artificial installation fixed in the heavy hammer method present stage.

Description

Technical Field

[0001] This utility model belongs to the field of measuring equipment and relates to a testing machine device, specifically a testing machine coaxiality verification device. Background Technology

[0002] The calibration device is mainly applicable to electronic universal testing machines. These machines utilize a servo motor as a power source, with rotation controlled by a speed regulation system. After deceleration by a reduction system, a precision lead screw drives the moving crossbeam to rise and fall, performing various mechanical property tests on metallic and non-metallic materials, including tensile, compression, bending, and shear tests. The overall structure of the electronic universal testing machine mainly consists of a gantry-type column structure, a moving crossbeam, a servo motor acceleration and deceleration system, a force measuring system, and auxiliary fixtures.

[0003] Currently, according to JJG 475-2008 "Verification Procedure for Electronic Universal Testing Machines", the verification method for the coaxiality of testing machines with a range of no more than 5kN is to use the weight method. Specifically, a weight is suspended at the center of force on the testing machine with a tensile space of no less than 500mm, so that the center of the weight is located within a circle with a diameter of 2mm centered on the lower center of force.

[0004] However, in actual use of the weighted hammer method for verification, the suspension rope connecting the weight cannot be guaranteed to be correctly fixed at the center of the force point on the testing machine. The connection between the weight and the suspension rope mainly relies on manual knotting for fixation, which easily causes angular deviation between the center axis of the weight and the center axis of the suspension rope. The specifications and dimensions of the upper and lower force points of testing machines produced by different manufacturers are inconsistent, making it impossible to completely fix the weight and suspension rope by making tooling of appropriate specifications and dimensions. In the description of the verification method as "within a circle with a diameter of 2mm centered on the lower force center", the lower force plate of the general testing machine does not have an etched or obvious characteristic of a center circle with a diameter of 2mm, requiring manual determination of the center circle or center point of the lower force plate, which involves many uncertainties. In terms of metrological verification instrument requirements, it is difficult to trace the overall coaxiality of the weight and suspension rope assembly through metrological traceability. Some horizontal testing machines cannot be verified for coaxiality using the weighted hammer method.

[0005] It is evident that in the existing technology, the manual fixing of the weight and rope in the actual use of the weight method for verification is inefficient, and the combination of the weight and rope is temporarily difficult to measure and trace, thus failing to guarantee the accuracy of the coaxiality verification and measurement traceability of testing machines with a range not exceeding 5kN. Utility Model Content

[0006] This invention overcomes the above-mentioned defects and provides a coaxiality verification device for testing machines. This verification device offers simple and convenient metrological traceability. By detecting the coaxiality of the device at stress points of different specifications and dimensions, the accuracy of the verification method can be guaranteed, reducing the uncertainty in measurement results caused by manual installation and fixation in the current heavy hammer method.

[0007] The technical solution of this utility model is as follows.

[0008] A coaxiality testing device for a testing machine includes: an upper force-bearing point clamping and fixing component and a lower force-bearing point clamping and fixing component.

[0009] The upper force-bearing point clamping and fixing component includes a coaxial bar with a tapered angle, a first three-jaw centering clamping component, a workpiece centering and fixing component, and a second three-jaw centering clamping component.

[0010] The first three-jaw centering clamping component and the second three-jaw centering clamping component are fixed to the workpiece by centering and fixing, so that the first three-jaw centering clamping component and the second three-jaw centering clamping component are on the same central axis; the coaxial bar with tapered angle is clamped and fixed by the first three-jaw centering clamping component.

[0011] Among them, the conical angle coaxiality bar, the first three-jaw centering clamping component, the workpiece centering and fixing component, and the second three-jaw centering clamping component are on the same central axis.

[0012] The clamping dimensions of the second and third jaw centering clamping components are adjustable.

[0013] The lower force-bearing point clamping and fixing component includes: a self-aligning flat workpiece, a circular hole feature, and a third three-jaw centering clamping component.

[0014] The third three-jaw centering clamping component and the self-aligning flat workpiece are fixedly installed so that the third three-jaw centering clamping component and the self-aligning flat workpiece are on the same central axis.

[0015] Among them, the self-aligning flat plate workpiece and the round hole feature are on the same central axis.

[0016] The clamping dimensions of the third three-jaw centering clamping component are adjustable.

[0017] In this utility model, the functions of the self-aligning fixed workpiece and the self-aligning flat workpiece are as follows:

[0018] 1. The self-aligning and fixing workpiece has screw holes. It is fixedly installed with the first three-jaw centering clamping component and the second three-jaw centering clamping component by locking screws respectively. Generally, there is a gap between the locking screw and the mounting holes on the first three-jaw centering clamping component and the second three-jaw centering clamping component. The coaxiality of the first three-jaw centering clamping component and the second three-jaw centering clamping component can be ensured by adjusting the relative position of the first three-jaw centering clamping component, the self-aligning and fixing workpiece and the second three-jaw centering clamping component.

[0019] 2. The function of the self-aligning plate workpiece is similar to the installation and adjustment process described above. By adjusting the relative position of the self-aligning plate workpiece and the third three-jaw centering clamping component, the coaxiality of the circular hole feature and the third three-jaw centering clamping component is ensured.

[0020] The upper force-bearing point clamping and fixing component is installed and fixed on the force-bearing point of the test machine under test through the second three-jaw centering clamping component.

[0021] The lower force-bearing point clamping and fixing component is installed and fixed on the lower force-bearing point of the test machine through the third three-jaw centering clamping component.

[0022] Among them, the lower force-bearing clamping and fixing components and the lower force-bearing point of the test machine under test remain fixed.

[0023] The height of the stress point on the test machine relative to the stress point on the lower part of the test machine can be adjusted by the crossbeam of the test machine.

[0024] The tapered coaxiality bar is adjusted by the crossbeam of the test machine to change the height of the upper force point relative to the lower force point of the test machine. This causes the tip of the tapered coaxiality bar to fall onto the self-aligning flat workpiece plane with a circular hole feature in the clamping and fixing component of the lower force point. The coaxiality of the test machine is then determined by judging whether the tip of the tapered coaxiality bar is within the range of the circular hole feature.

[0025] The coaxiality measurement and traceability method of the present invention includes: the upper force point clamping and fixing component clamping and fixing coaxiality bars of different diameter specifications through the second three-jaw centering clamping component.

[0026] Among them, the position of the coaxiality bar with tapered angle and the coaxiality bar with different diameter specifications remains unchanged relative to the central axis.

[0027] By measuring the coaxiality measurement parameters of the coaxiality bar with tapered angle and coaxiality bars of different diameters, the coaxiality of the upper force-bearing clamping and fixing component is ensured when clamping the force-bearing points of the test machine of different sizes.

[0028] The upper force-bearing point clamping and fixing component clamps and fixes coaxiality bars of different diameter specifications through the third three-jaw centering clamping component.

[0029] Among them, the circular hole feature and the coaxiality bars of different diameters remain unchanged in position relative to the central axis.

[0030] By measuring the coaxiality measurement parameters of the coaxiality bars with circular holes and different diameter specifications, the coaxiality of the lower force-bearing clamping and fixing components is ensured when clamping the force-bearing points on the testing machine of different specifications and sizes.

[0031] Compared with the prior art, the advantages of this utility model are:

[0032] This utility model provides a coaxiality verification device for a testing machine. By utilizing a combination structure of a coaxiality bar, a self-aligning workpiece, and a three-jaw centering clamping component, the verification method using this utility model can save manual installation and fixing time compared to the current verification method of manually fixing a weight. It is applicable to horizontal structure testing machines and testing machines with different specifications and sizes of stress points.

[0033] The calibration device of this utility model is simple and convenient for metrological traceability. By detecting the coaxiality of the device at force points of different specifications and sizes, the accuracy of the calibration method of this utility model device can be guaranteed, and the uncertainty of the measurement results caused by the manual installation and fixing in the current heavy hammer method can be reduced. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of the testing machine under inspection;

[0035] Figure 2 This is a front view schematic diagram of the device of this utility model installed and fixed on the test machine under test to carry out the measurement value transfer work;

[0036] Figure 3 yes Figure 2 The figure shown is a three-dimensional structural diagram of the device of this utility model installed and fixed on the test machine under test to carry out the measurement value transfer work;

[0037] Figure 4 This is an exploded structural diagram of the device of this utility model installed and fixed on the test machine under test.

[0038] Figure 5 This is an exploded structural diagram of the device of this utility model installed and fixed at the stress point under the test machine.

[0039] Figure 6 This is a schematic diagram of the overall structure of the force-bearing clamping and fixing component for metering and traceability in the device of this utility model.

[0040] Figure 7 This is a schematic diagram of the overall structure of the lower force-bearing clamping and fixing component for metering and traceability in this utility model device;

[0041] Figure 8This is a structural schematic diagram of the first three-jaw centering clamping component, the first three-jaw centering clamping component, and the first three-jaw centering clamping component.

[0042] The components in the diagram are as follows:

[0043] 1. External structure of the testing machine under inspection; 2. Crossbeam of the testing machine under inspection; 3. Upper stress point of the testing machine under inspection; 4. Lower stress point of the testing machine under inspection; 5. Base of the testing machine under inspection; 6. Upper stress point clamping and fixing component; 7. Lower stress point clamping and fixing component; 6-1. Coaxiality bar with tapered angle; 6-2. First three-jaw centering clamping component; 6-3. Centering and fixing workpiece; 6-4. Second three-jaw centering clamping component; 6-5. Coaxiality bars of different diameters; 6-6. Locking screw; 7-1. Centering flat workpiece; 7-2. Circular hole feature; 7-3. Third three-jaw centering clamping component; 8-1. Outer shell; 8-2. Movable jaws; 8-3. Drive component with threaded groove and bevel gear; 8-4. Bevel gear adjusting component. Detailed Implementation

[0044] This utility model mainly aims to improve and innovate the current method for verifying the coaxiality of testing machines with a range of no more than 5kN, and proposes a testing machine coaxiality verification device and its verification method.

[0045] The specific components of this utility model's calibration device are as follows: Figures 4-5 As shown, its installation and fixing method is as follows: Figures 1-3 As shown.

[0046] Before the inspection, the upper force point clamping and fixing component 6 and the lower force point clamping and fixing component 7 are reserved between the upper force point 3 and the lower force point 4 of the test machine under inspection.

[0047] The upper force-bearing point clamping and fixing component 6 consists of a coaxial bar with a tapered angle 6-1, a first three-jaw centering clamping component 6-2, a centering and fixing workpiece 6-3, a second three-jaw centering clamping component 6-4, and a locking screw 6-6.

[0048] The first three-jaw centering clamping component 6-2 and the second three-jaw centering clamping component 6-4 are respectively installed and fixed on the self-aligning and fixing workpiece 6-3 by locking screws 6-6. By adjusting the relative positions of the first three-jaw centering clamping component 6-2, the second three-jaw centering clamping component 6-4 and the self-aligning and fixing workpiece 6-3, the first three-jaw centering clamping component 6-2 and the second three-jaw centering clamping component 6-4 are on the same central axis; the coaxial bar 6-1 with tapered angle is clamped and fixed by the first three-jaw centering clamping component 6-2.

[0049] Therefore, the conical angle coaxiality bar 6-1, the first three-jaw centering clamping component 6-2, the centering and fixing workpiece 6-3, and the second three-jaw centering clamping component 6-4 are on the same central axis.

[0050] The upper force-bearing point clamping and fixing component 6 is installed and fixed in advance according to the above installation method. Then, the clamping size of the second three-jaw centering clamping component 6-4 is changed and installed and fixed on the force-bearing point 3 of the test machine under test.

[0051] The lower force-bearing point clamping and fixing component 7 consists of a self-aligning flat workpiece 7-1 with a round hole feature, a round hole feature 7-2, a third three-jaw centering clamping component 7-3, and a locking screw 6-6.

[0052] The self-aligning flat workpiece 7-1 is mounted and fixed on the third three-jaw centering clamping component 7-3 by locking screws 6-6. By adjusting the relative positions of the self-aligning flat workpiece 7-1 and the third three-jaw centering clamping component 7-3, the third three-jaw centering clamping component 7-3 and the self-aligning flat workpiece 7-1 with the round hole feature 7-2 are on the same central axis.

[0053] Therefore, the self-aligning flat workpiece 7-1 and the circular hole feature 7-2 are on the same central axis.

[0054] The lower force-bearing point clamping and fixing component 7 is installed and fixed in advance according to the above installation method. Then, the clamping size of the third three-jaw centering clamping component 7-3 is changed and installed and fixed on the lower force-bearing point 4 of the test machine under test.

[0055] The conical coaxiality bar 6-1 is adjusted by the crossbeam 2 of the test machine to change the height of the force point 3 on the test machine, so that the tip of the conical angle of the conical coaxiality bar 6-1 falls onto the plane of the self-aligning flat workpiece 7-1 with a circular hole feature in the clamping and fixing part 7 of the lower force point. It is then determined whether the tip of the conical angle of the conical coaxiality bar 6-1 is within the range of the circular hole feature 7-2. It should be noted that Figure 5 The central hole 7-2 is the center hole of the self-aligning flat workpiece 7-1, and the other holes are the mounting screw holes of the locking screw 6-6. The judgment condition is whether it falls into the central hole of the central hole 7-2, thereby judging the coaxiality of the tested machine.

[0056] The coaxiality measurement traceability method of this utility model's calibration device and its specific components are as follows: Figures 6-7 As shown.

[0057] The coaxiality measurement traceability method of this utility model uses the upper force point clamping and fixing component 6 and the lower force point clamping and fixing component 7 to clamp coaxiality bars 6-5 of different diameter specifications for measurement traceability.

[0058] The upper force-bearing clamping and fixing component 6 clamps and fixes coaxial bars 6-5 of different diameter specifications through the second three-jaw centering clamping component 6-4, so that the position of the coaxial bar 6-1 with tapered angle and the coaxial bar 6-5 of different diameter specifications relative to the central axis remains unchanged.

[0059] By measuring the coaxiality measurement parameters of the coaxiality bar 6-1 with a tapered angle and the coaxiality bars 6-5 with different diameter specifications, the coaxiality of the upper force-bearing clamping and fixing component 6 is ensured when clamping the force-bearing point 3 on the testing machine of different specifications and sizes.

[0060] The lower force-bearing clamping and fixing component 7 clamps and fixes coaxiality bars 6-5 of different diameter specifications through the third three-jaw centering clamping component 7-3, so that the position of the circular hole feature 7-2 and the coaxiality bars 6-5 of different diameter specifications relative to the central axis remains unchanged.

[0061] By measuring the coaxiality measurement parameters of the coaxiality feature 7-2 with a circular hole and the coaxiality bars 6-5 of different diameters, the coaxiality of the lower force-bearing clamping and fixing component 7 is ensured when clamping the force-bearing point 4 on the test machine of different sizes.

[0062] It should be noted that during tracing the source, only measurement is required. Figure 6 The overall coaxiality of the conical coaxiality bar 6-1 with different diameter specifications and the coaxiality of the coaxiality bar 6-5, and Figure 7 The coaxiality of the overall circular hole feature 7-2 and the coaxiality bars 6-5 of different diameter specifications is unrelated to the testing machine being inspected.

[0063] In this embodiment, the first three-jaw centering clamping component, the first three-jaw centering clamping component, and the first three-jaw centering clamping component are as follows: Figure 8 As shown, the device includes a housing 8-1, movable jaws 8-2, a drive component 8-3 with threaded grooves and bevel gears, and a bevel gear adjusting component 8-4. By rotating the bevel gear adjusting component 8-4 with a wrench, the rotation of the bevel gear adjusting component 8-4 drives the drive component 8-3 with threaded grooves and bevel gears to rotate in a circle. The drive component 8-3 with threaded grooves and bevel gears drives the three jaws of the movable jaws 8-2 to move radially towards the center simultaneously, thereby completing the automatic centering or clamping of the jaws 8-2. In this embodiment, the three-jaw centering clamping component (three-jaw chuck) is an existing centering clamping product that can be purchased commercially.

Claims

1. A device for verifying the coaxiality of a testing machine, characterized in that, The test machine includes a main body, a crossbeam (2), an upper force point (3), a lower force point (4), a base (5), an upper force point clamping and fixing component (6), and a lower force point clamping and fixing component (7). The crossbeam (2) is located at the top of the main body. The upper force point (3) is connected to the crossbeam (2). The lower force point (4) is located below the upper force point (3) and on the top of the base (5). The upper force point clamping and fixing component (6) and the lower force point clamping and fixing component (7) are connected to the upper force point (3) and the lower force point (4) of the test machine, respectively.

2. The coaxiality calibration device for a testing machine as described in claim 1, characterized in that, The upper force-bearing point clamping and fixing component (6) consists of a coaxial bar with a tapered angle (6-1), a first three-jaw centering clamping component (6-2), a centering and fixing workpiece (6-3), and a second three-jaw centering clamping component (6-4). The first three-jaw centering clamping component (6-2) and the second three-jaw centering clamping component (6-4) are on the same central axis, and the centering and fixing workpiece (6-3) is connected between the first three-jaw centering clamping component (6-2) and the second three-jaw centering clamping component (6-4). The coaxial bar with a tapered angle (6-1) is connected below the first three-jaw centering clamping component (6-2).

3. The coaxiality verification device for a testing machine as described in claim 2, characterized in that, The three-jaw centering clamping component (6-4) is connected to upper force-bearing points (3) of different specifications.

4. The coaxiality testing device for a testing machine as described in claim 1, characterized in that, The lower force-bearing point clamping and fixing component (7) consists of a self-aligning flat workpiece (7-1) and a third three-jaw centering clamping component (7-3); the third three-jaw centering clamping component (7-3) and the self-aligning flat workpiece (7-1) are fixedly installed such that the third three-jaw centering clamping component (7-3) and the self-aligning flat workpiece (7-1) with a round hole feature are on the same central axis; the self-aligning flat workpiece (7-1) has a round hole feature (7-2).

5. The coaxiality testing device for a testing machine as described in claim 4, characterized in that, The third three-jaw centering clamping component (7-3) is connected to different specifications of lower force-bearing points (4) below.

6. The coaxiality calibration device for a testing machine as described in claim 1, characterized in that, The height position of the upper force point (3) of the test machine relative to the lower force point (4) of the test machine is adjusted by the crossbeam (2) of the test machine.

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