CN109781398B - Screw connection anti-loosening test measurement device and method - Google Patents
Screw connection anti-loosening test measurement device and method Download PDFInfo
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Abstract
The invention discloses a screw connection anti-loosening test measurement device and a screw connection anti-loosening test measurement method. According to the invention, axial load, torque, overturning moment and vibration can be applied to a plurality of screws at the same time, and a screw connection anti-loosening performance test is performed; the invention can realize the test of the connection looseness resistance of screws with different diameters for the sizes of screws with different sizes; the invention can realize the screw connection looseness prevention performance test of the connected piece with different materials, different friction coefficients, different surface morphologies and different diameters and structures; basic test data and technical basis are provided for solving the problem of looseness prevention of screw connection in engineering.
Description
Technical Field
The invention belongs to the technical field of threaded connection experiments, and particularly relates to a test device and a test method for detecting looseness prevention of screw connection under the action of external load and vibration.
Background
The threaded connection is easy to realize the adjustment of pretightening force and convenient to assemble, disassemble and maintain, so that the threaded connection is the most widely applied connection mode between a machine tool and other complex machines. Under the condition of small static load and working temperature change, the connecting screw thread is not loosened due to the fact that the screw angle meets the self-locking condition and the pretightening force. However, in the case of a threaded connection with large impact, vibration, variable load or temperature changes, the threaded connection may come loose, resulting in failure of the connection. To prevent the threaded connection from loosening, it must be tested and evaluated for its anti-loosening properties.
At present, most of test methods for evaluating the looseness resistance of threaded connection are performed on bolt-nut connection, and the looseness resistance is basically achieved by preventing relative rotation between a bolt and a nut, wherein through holes are formed in upper and lower connected pieces. In the engineering, the thickness of the connected piece with the through hole is smaller, the deformation is larger after loading, the connected piece with the threaded hole is generally quite thick, and more in practice, the connected piece with the threaded hole is connected by adopting screws. In addition, the conventional tests for threaded connections are often performed with a single bolt, and the single-direction load or vibration is often applied to the bolt. Therefore, aiming at the existing situation, it is necessary to provide a screw connection anti-loosening test device and a screw connection anti-loosening test method so as to bear multidirectional load and vibration at the same time, and the change of pretightening force in the test process can be monitored in real time.
Disclosure of Invention
The invention aims to provide a screw connection anti-loosening test measurement device and a screw connection anti-loosening test measurement method, so as to overcome the problems in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
A screw connection anti-loosening test measurement device comprises a T-shaped groove platform, a screw connection bearing assembly and a loading assembly, wherein the screw connection bearing assembly and the loading assembly are connected to the T-shaped groove platform;
The screw connection bearing assembly comprises a base, the base is fixed on one side of a T-shaped groove platform through a T-shaped bolt, an upper bearing piece is arranged on the base, a plurality of square stepped holes are formed in the base, mounting holes corresponding to the square stepped holes are formed in the upper bearing piece, a lower connecting piece is mounted in the square stepped holes, an upper connecting piece is mounted Kong Zhongan, a test screw is screwed into a threaded hole of the lower connecting piece through a through hole of the upper connecting piece to form a screw connection pair, and an annular force sensor is mounted between the joint surface of part of the test screw and the upper connecting piece;
the loading assembly comprises a loading base, the loading base is fixedly arranged on the other side of the T-shaped groove platform through a T-shaped bolt, a sliding seat is fixed on the loading base, a support is arranged in a sliding groove of the sliding seat, a vertical plate of the sliding seat is connected with a loading screw rod in a threaded manner, and one end of the loading screw rod penetrating through the vertical plate is contacted with one end of the support;
The side plate of the upper bearing piece is connected with a first flange, the other end of the support is connected with a second flange, and a force sensor is connected between the first flange and the second flange.
Further, a locating pin is installed between the upper connecting piece and the upper bearing piece.
Further, the contact point of the loading screw and the support passes through the axial centers of the second flange plate, the force sensor and the first flange plate.
Further, the sliding groove of the sliding seat is a dovetail groove.
Further, the test screw with the annular force sensor installed and the test screw without the annular force sensor installed are arranged at intervals.
The screw connection anti-loosening test measurement method comprises a screw connection anti-loosening performance test measurement method under the action of complex load and vibration and a screw connection anti-loosening performance test measurement method under the action of axial load, overturning moment and vibration;
the test and measurement method for the anti-loosening performance of the screw connection under the action of complex load and vibration comprises the following steps:
Step 1.1: for the test screw without the annular force sensor, screwing the test screw into a threaded hole of the lower connecting piece through a through hole of the upper connecting piece, and screwing the test screw to a preset pretightening force through a torque wrench; installing an annular force sensor between the test screw and the upper connecting piece, tightening the test screw, and reading the value of the pretightening force through a data acquisition instrument;
Step 1.2: rotating the loading screw rod to enable the loading screw rod to be in contact with the support, enabling an offset distance e to be arranged between the installation position of the axial center of the first flange plate on the side plate of the upper bearing member and the symmetry axis of the upper bearing member, rotating the loading screw rod to apply load, monitoring the magnitude of external load through the force sensor and the data acquisition instrument, transmitting acting force to the test screw through the upper bearing member to enable the test screw to bear axial load, torque and overturning moment at the same time, enabling exciting force to act on the side plate of the upper bearing member through the vibration exciter until a certain screw loosens or reaches a certain vibration frequency, and stopping the machine, and monitoring the change condition of the pretightening force of the test screw through the annular force sensor in the process;
the test measurement method for the anti-loosening performance of the screw connection under the action of axial load, overturning moment and vibration comprises the following steps:
Step 1.1: for the test screw without the annular force sensor, screwing the test screw into a threaded hole of the lower connecting piece through a through hole of the upper connecting piece, and screwing the test screw to a preset pretightening force through a torque wrench; installing an annular force sensor between the test screw and the upper connecting piece, tightening the test screw, and reading the value of the pretightening force through a data acquisition instrument;
Step 1.2: the loading screw is rotated to make the loading screw contact with the support, the axis center of the first flange plate is located on the symmetry axis of the upper bearing part at the installation position on the side plate of the upper bearing part, the loading screw is rotated to apply load, the magnitude of external load is monitored through the force sensor and the data acquisition instrument, acting force is transmitted to the test screw through the upper bearing part to enable the test screw to bear axial load and overturning moment at the same time, exciting force is applied to the side plate of the upper bearing part through the vibration exciter until a certain test screw loosens or reaches a certain vibration frequency, and then the machine is stopped, and the change condition of the pretightening force of the test screw is monitored through the annular force sensor in the process.
Compared with the prior art, the invention has the following beneficial technical effects:
The test device can apply axial load, torque, overturning moment and vibration to a plurality of screws at the same time, can also apply axial load, overturning moment and vibration independently, can apply vibration independently, and performs a screw connection anti-loosening performance test; the invention can realize the test of the connection looseness resistance of screws with different diameters and different structures by changing the sizes and structures of the upper connecting piece, the lower connecting piece and the test screw; the invention can realize the screw connection looseness prevention performance test of different materials and different friction coefficients of the connected piece by changing the materials and the surface processing modes of the upper and lower connecting pieces; the invention can monitor the change of the pretightening force of the screw at different positions when the external load acts through a plurality of annular force sensors arranged between the screw and the upper connecting piece.
According to the method, axial load, torque, overturning moment and vibration can be applied to a plurality of screws at the same time, and a screw connection looseness prevention performance test is carried out; the invention can realize the test of the connection looseness resistance of screws with different diameters for the sizes of screws with different sizes; the invention can also realize screw connection looseness prevention performance tests of different materials, different friction coefficients, different surface morphologies and different diameters and structures of the connected piece; basic test data and technical basis are provided for solving the problem of looseness prevention of screw connection in engineering.
Drawings
FIG. 1 is an isometric view of the overall assembly of the present invention;
FIG. 2 is an installation view of the screw connection assembly of the present invention, wherein (a) is a sectional view and (b) is a perspective view;
FIG. 3 is an installation view of the screw pretension monitoring assembly of the present invention, wherein (a) is a cross-sectional view and (b) is a perspective view;
fig. 4 is a schematic view of the load point of the present invention.
In the figure, a T-shaped trough platform; 2. a base; 3. an upper carrier; 4. a ring force sensor; 5. a test screw; t-shaped bolts; 7. a first flange; 8. a force sensor; 9. a slide; 10. a second flange; 11 support seats; 12. loading a base; 13. loading a screw; 14. an upper connecting piece; 15. a lower connecting piece; 16. and positioning pins.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
Referring to fig. 1 to 4, a screw connection anti-loosening performance test measurement device comprises a T-shaped groove platform 1 comprising a T-shaped groove, a screw connection bearing assembly and a loading assembly, wherein the screw connection bearing assembly and the loading assembly are installed on the T-shaped groove platform 1, a base 2 of the screw connection bearing assembly is fixed on the T-shaped groove platform 1 through two groups of T-shaped bolts 6, a loading base 12 of the loading assembly is fixed on the other side of the T-shaped groove platform 1 through the T-shaped bolts, a first flange 7 is connected with a side plate of an upper bearing piece 3 of the screw connection bearing assembly, a second flange 10 is connected with a support 11 of the loading assembly, and a force sensor 8 is installed between the first flange 7 and the second flange 10.
The screw connection bearing assembly is characterized in that a base 2 is fixedly arranged on one side of a T-shaped groove platform 1 through two groups of T-shaped bolts 6, 6 square stepped holes are uniformly formed in the base 2 around the circumferential center direction, and a lower connecting piece 15 is arranged in the square stepped holes corresponding to the base 2; the upper bearing piece 3 is placed on the base 2, 6 square mounting holes are uniformly formed in the same position of the upper bearing piece 3 corresponding to the base 2, and the upper connecting piece 14 is arranged in the mounting holes of the upper bearing piece 3; the test screw 5 is screwed into a threaded hole of the lower connecting piece 15 through a through hole of the upper connecting piece 14 to form a screw connection pair; the side plate of the upper carrier 3 is connected to the support 11 of the loading assembly via a first flange 7, a force sensor 8 and a second flange 10. An annular force sensor 4 is arranged between the joint surface of part of the test screw 5 and the upper connecting piece 14;
The loading assembly is characterized in that a loading base 12 is fixedly arranged on the other side of a T-shaped groove platform 1 through a T-shaped bolt 6, a sliding seat 9 is fixed on the loading base 12, a support 11 is arranged in a dovetail groove of the sliding seat 9, the support 11 is connected with a side plate of an upper bearing piece 3 of a screw connection bearing assembly through a second flange plate 10, a force sensor 8 and a first flange plate 7, a loading screw 13 is screwed into a vertical plate threaded hole of the sliding seat 9 and is in contact with the support 11, and the contact point is loaded and unloaded through the axial center of the second flange plate 10 and the force sensor 8 and the threads of the loading screw 13.
The test and measurement method of the anti-loosening performance of the screw connection under the complex load and vibration conditions comprises the following steps: ① Selecting an upper connecting piece 14 and a lower connecting piece 15 which are matched with the diameters of test screws, installing the lower connecting piece 15 in a stepped square hole corresponding to the base 2, installing the upper connecting piece 14 in a square hole of the upper bearing piece 3, and installing a pin 16 between the upper connecting piece 14 and the upper bearing piece 3; for the screw connection assembly without the annular force sensor 4, the test screw 5 is screwed into the threaded hole of the lower connecting piece 15 through the through hole of the upper connecting piece 14, and the test screw 5 is screwed to a preset pretightening force through a torque wrench. The screw pretightening force monitoring component of the annular force sensor 4 is installed, the annular force sensor 4 is installed between the test screw 5 and the upper connecting piece 14, the screw is screwed, and the pretightening force value is read through the data acquisition instrument. ② The loading screw 13 installed in the threaded hole of the vertical plate of the loading assembly sliding seat 9 is rotated to enable the loading screw 13 to be in contact with the support 11, the contact point passes through the second flange plate 10, the force sensor 8 and the axis center of the first flange plate 7, the first flange plate 7 is connected with the side plate of the upper bearing piece 3, as shown in fig. 4, an offset distance e exists between the installation position of the axis center O point of the first flange plate on the side plate of the upper bearing piece 3 and the symmetry axis A-A of the upper bearing piece. The rotary loading screw 13 applies load, the force sensor 8 and the data acquisition instrument monitor the magnitude of external load, the acting force is transmitted to the screw connection assembly through the upper bearing part 3, and the screw connection is simultaneously subjected to axial load, torque and overturning moment. Starting the vibration exciter, applying the exciting force to the side plate of the upper bearing piece 3, stopping the machine until a certain screw loosens or reaches a certain vibration frequency, and monitoring the change condition of the pretightening force of the measured screw through the annular force sensor 4 in the process. The steps are repeated, and the anti-loosening performance of screw connection under different pretightening forces, different external loads, different exciting forces, different vibration frequencies and different vibration amplitudes can be tested.
Changing the aperture of the upper connecting piece 14, the size of the threaded hole of the lower connecting piece 15 and the diameter of the test screw 5, and then executing a step ①、② to perform a test of the anti-loosening performance of the screw connection with different sizes; changing the processing method of the thread tooth or structure and the screw head supporting surface of the test screw 5, and then executing a step ①、② to test the anti-loosening performance of the screw connection with different structures; changing the materials and surface processing methods of the upper connecting piece 14 and the lower connecting piece 15, and then executing a step ①、② to test the anti-loosening performance of screw connection with different friction coefficients on the surface of the connected piece;
The test method for the anti-loosening performance of the screw connection under the effects of axial load, overturning moment and vibration is carried out according to the following steps:
① Selecting an upper connecting piece 14 and a lower connecting piece 15 which are matched with the diameters of test screws, installing the lower connecting piece 15 in a stepped square hole corresponding to the base 2, installing the upper connecting piece 14 in a square hole of the upper bearing piece 3, and installing a pin 16 between the upper connecting piece 14 and the upper bearing piece 3; for the screw connection assembly without the annular force sensor 4, the test screw 5 is screwed into the threaded hole of the lower connecting piece 15 through the through hole of the upper connecting piece 14, and the test screw 5 is screwed to a preset pretightening force through a torque wrench. The screw pretightening force monitoring component of the annular force sensor 4 is installed, the annular force sensor 4 is installed between the test screw 5 and the upper connecting piece 14, the screw is screwed, and the pretightening force value is read through the data acquisition instrument. ② The loading screw 13 installed in the threaded hole of the vertical plate of the loading assembly sliding seat 9 is rotated, so that the loading screw 13 contacts with the support 11, the contact point passes through the second flange plate 10, the force sensor 8 and the axial center of the first flange plate 7, the first flange plate 7 is connected with the side plate of the upper bearing member 3, as shown in fig. 4, and the installation position of the axial center O point of the first flange plate on the side plate of the upper bearing member 3 is located on the symmetry axis A-A of the upper bearing member, namely, the offset distance e=0. The rotary loading screw 13 applies load, the force sensor 8 and the data acquisition instrument monitor the magnitude of external load, the acting force is transmitted to the screw connection assembly through the upper bearing part 3, and the screw connection is simultaneously subjected to axial load and overturning moment. Starting the vibration exciter, applying the exciting force to the side plate of the upper bearing piece 3, stopping the machine until a certain screw loosens or reaches a certain vibration frequency, and monitoring the change condition of the pretightening force of the measured screw through the annular force sensor 4 in the process. The steps are repeated, and the anti-loosening performance of screw connection under different pretightening forces, different external loads, different exciting forces, different vibration frequencies and different vibration amplitudes can be tested.
The invention is described in detail below with reference to examples:
As shown in fig. 1, the test device of the invention has the structure that a base 2 of a screw connection bearing assembly is fixed on a T-shaped groove platform 1 by two groups of T-shaped bolts, a loading base 12 of a loading assembly is fixed on the other side of the T-shaped groove platform 1 by the T-shaped bolts, a first flange 7 is connected with a side plate of an upper bearing part 3 of the screw connection bearing assembly, a second flange 10 is connected with a support 11 of the loading assembly, and a force sensor 8 is arranged between the first flange 7 and the second flange 10.
As shown in fig. 1 to 3, the screw connection bearing assembly of the invention is that a base 2 is fixedly arranged on a T-shaped groove platform 1, and a lower connecting piece 15 is arranged in a square stepped hole corresponding to the base 2; the upper bearing piece 3 is placed on the base 2, the upper connecting piece 14 is arranged in a corresponding hole of the upper bearing piece 3, and a pin 16 is arranged between the upper connecting piece 14 and the upper bearing piece 3 for positioning; the test screw 5 is screwed into a threaded hole of the lower connecting piece 15 through a through hole of the upper connecting piece 14 to form a screw connection pair; the side plate of the upper carrier 3 is connected to the support 11 of the loading assembly via a first flange 7, a force sensor 8 and a second flange 10. An annular force sensor 4 is arranged between the joint surface of part of the test screw 5 and the upper connecting piece 14;
As shown in fig. 1, the loading assembly is structured that a loading base 12 is fixedly installed on a T-shaped groove platform 1, a sliding seat 9 is fixed on the loading base 12, a support 11 is installed in a dovetail groove of the sliding seat 9, the support 11 is connected with a side plate of an upper bearing piece 3 of the screw connection bearing assembly through a second flange plate 10, a force sensor 8 and a first flange plate 7, a loading screw 13 is screwed into a vertical plate threaded hole of the sliding seat 9 and is contacted with the support 11, and the contact point passes through the axial center of the second flange plate 10 and the force sensor 8.
The method for carrying out the test of the anti-loosening performance of the multi-screw connection by using the test device of the invention is implemented according to different conditions according to the following steps:
1. Selecting an upper connecting piece 14 and a lower connecting piece 15 which are matched with the diameters of test screws, installing the lower connecting piece 15 in a stepped square hole corresponding to the base 2, installing the upper connecting piece 14 in a square hole of the upper bearing piece 3, and installing a pin 16 between the upper connecting piece 14 and the upper bearing piece 3; for the screw connection assembly without the annular force sensor 4, the test screw 5 is screwed into the threaded hole of the lower connecting piece 15 through the through hole of the upper connecting piece 14, and the test screw 5 is screwed to a preset pretightening force through a torque wrench. The screw pretightening force monitoring component of the annular force sensor 4 is installed, the annular force sensor 4 is installed between the test screw 5 and the upper connecting piece 14, the screw is screwed, and the pretightening force value is read through the data acquisition instrument.
2. A test method for the anti-loosening performance of screw connection under the action of complex external load. The loading screw 13 installed in the threaded hole of the vertical plate of the loading assembly sliding seat 9 is rotated to enable the loading screw 13 to be in contact with the support 11, the contact point passes through the second flange plate 10, the force sensor 8 and the axis center of the first flange plate 7, the first flange plate 7 is connected with the side plate of the upper bearing piece 3, as shown in fig. 4, an offset distance e exists between the installation position of the axis center O point of the first flange plate on the side plate of the upper bearing piece 3 and the symmetry axis A-A of the upper bearing piece. The rotary loading screw 13 applies load, the force sensor 8 and the data acquisition instrument monitor the magnitude of external load, the acting force is transmitted to the screw connection assembly through the upper bearing part 3, and the screw connection is simultaneously subjected to axial load, torque and overturning moment. Starting the vibration exciter, applying the exciting force to the side plate of the upper bearing piece 3, stopping the machine until a certain screw loosens or reaches a certain vibration frequency, and monitoring the change condition of the pretightening force of the measured screw through the annular force sensor 4 in the process. The steps are repeated, and the anti-loosening performance of screw connection under different pretightening forces, different external loads, different exciting forces, different vibration frequencies and different vibration amplitudes can be tested.
3. Test of anti-loosening performance of screws with different sizes and structures. By adopting the test device and the test method, the test of the connection looseness resistance of screws with different sizes can be realized by changing the aperture of the upper connecting piece 14, the size of the threaded hole of the lower connecting piece 15 and the diameter of the test screw 5; the test of the connection looseness resistance of screws with different structures can be realized by changing the thread teeth or the structure of the test screw 5 and the processing method of the screw head supporting surface;
4. And (3) testing the looseness resistance of screw connection of different materials and friction coefficients. The materials and the combined surface processing method of the upper connecting piece 14 and the lower connecting piece 15 are changed, and the performance test of the looseness resistance of the screw connection with different friction coefficients of the surface of the connected piece is adopted by the test device and the test method;
5. A test method for the looseness-preventing performance of screw connection under the action of axial load, overturning moment and vibration. Installing and pre-tightening a screw assembly according to the method of the step 1; the loading screw 13 installed in the threaded hole of the vertical plate of the loading assembly sliding seat 9 is rotated, so that the loading screw 13 contacts with the support 11, the contact point passes through the second flange plate 10, the force sensor 8 and the axial center of the first flange plate 7, the first flange plate 7 is connected with the side plate of the upper bearing member 3, as shown in fig. 4, and the installation position of the axial center O point of the first flange plate on the side plate of the upper bearing member 3 is located on the symmetry axis A-A of the upper bearing member, namely, the offset distance e=0. The rotary loading screw 13 applies load, the force sensor 8 and the data acquisition instrument monitor the magnitude of external load, the acting force is transmitted to the screw connection assembly through the upper bearing part 3, and the screw connection is simultaneously subjected to axial load and overturning moment. Starting the vibration exciter, applying the exciting force to the side plate of the upper bearing piece 3, stopping the machine until a certain screw loosens or reaches a certain vibration frequency, and monitoring the change condition of the pretightening force of the measured screw through the annular force sensor 4 in the process. The steps are repeated, and the anti-loosening performance of screw connection under different pretightening forces, different external loads, different exciting forces, different vibration frequencies and different vibration amplitudes can be tested.
Claims (5)
1. The screw connection anti-loosening test measurement device comprises a T-shaped groove platform (1), and a screw connection bearing component and a loading component which are connected to the T-shaped groove platform (1);
The screw connection bearing assembly comprises a base (2), the base (2) is fixed on one side of a T-shaped groove platform (1) through a T-shaped bolt (6), an upper bearing part (3) is arranged on the base (2), a plurality of square stepped holes are formed in the base (2), mounting holes corresponding to the square stepped holes are formed in the upper bearing part (3), a lower connecting part (15) is mounted in the square stepped holes, an upper connecting part (14) is mounted Kong Zhongan, a test screw (5) is screwed into a threaded hole of the lower connecting part (15) through a through hole of the upper connecting part (14) to form a screw connection pair, and an annular force sensor (4) is mounted between the joint surfaces of part of the test screw (5) and the upper connecting part (14);
The loading assembly comprises a loading base (12), the loading base (12) is fixedly arranged on the other side of the T-shaped groove platform (1) through a T-shaped bolt (6), a sliding seat (9) is fixed on the loading base (12), a support (11) is arranged in a sliding groove of the sliding seat (9), a loading screw (13) is connected to a vertical plate of the sliding seat (9) in a threaded manner, and one end of the loading screw (13) penetrates through the vertical plate to be in contact with one end of the support (11);
A first flange plate (7) is connected to the side plate of the upper bearing piece (3), a second flange plate (10) is connected to the other end of the support (11), and a force sensor (8) is connected between the first flange plate (7) and the second flange plate (10);
the method is characterized by comprising a screw connection anti-loosening performance test measurement method under the action of complex load and vibration and a screw connection anti-loosening performance test measurement method under the action of axial load, overturning moment and vibration;
the test and measurement method for the anti-loosening performance of the screw connection under the action of complex load and vibration comprises the following steps:
Step 1.1: for the test screw (5) without the annular force sensor (4), screwing the test screw (5) into a threaded hole of the lower connecting piece (15) through a through hole of the upper connecting piece (14), and screwing the test screw (5) to a preset pretightening force through a torque wrench; the method comprises the steps of installing an annular force sensor (4) between a test screw (5) provided with the annular force sensor (4) and an upper connecting piece (14), tightening the test screw (5), and reading the value of the pretightening force through a data acquisition instrument;
Step 1.2: the method comprises the steps of rotating a loading screw (13), enabling the loading screw (13) to be in contact with a support (11), enabling an axial center of a first flange plate to have a offset distance e between an installation position on a side plate of an upper bearing piece (3) and a symmetrical axis of the upper bearing piece, applying load by the rotating loading screw (13), monitoring the magnitude of external load through a force sensor (8) and a data acquisition instrument, enabling acting force to be transmitted to a test screw (5) through the upper bearing piece (3) so as to enable the test screw to bear axial load, torque and overturning moment simultaneously, enabling exciting force to act on a side plate of the upper bearing piece (3) through an exciter until a certain screw loosens or reaches a certain vibration frequency, and stopping the test screw, wherein the change condition of the pretightening force of the test screw is monitored through an annular force sensor (4);
the test measurement method for the anti-loosening performance of the screw connection under the action of axial load, overturning moment and vibration comprises the following steps:
Step 1.1: for the test screw (5) without the annular force sensor (4), screwing the test screw (5) into a threaded hole of the lower connecting piece (15) through a through hole of the upper connecting piece (14), and screwing the test screw (5) to a preset pretightening force through a torque wrench; the method comprises the steps of installing an annular force sensor (4) between a test screw (5) provided with the annular force sensor (4) and an upper connecting piece (14), tightening the test screw (5), and reading the value of the pretightening force through a data acquisition instrument;
Step 1.2: the loading screw rod (13) is rotated, the loading screw rod (13) is in contact with the support (11), the axis center of the first flange plate (7) is located on the symmetry axis of the upper bearing part at the installation position on the side plate of the upper bearing part (3), the loading screw rod (13) is rotated, the load is applied, the size of the external load is monitored through the force sensor (8) and the data acquisition instrument, the acting force is transmitted to the test screw (5) through the upper bearing part (3), the axial load and the overturning moment are borne at the same time, the exciting force is applied to the side plate of the upper bearing part (3) through the vibration exciter, the machine is stopped until a certain test screw loosens or reaches a certain vibration frequency, and the change condition of the pretightening force of the test screw is monitored through the annular force sensor (4) in the process.
2. A screw connection anti-loosening test measurement method according to claim 1, characterized in that a locating pin (16) is mounted between the upper connecting piece (14) and the upper carrier piece (3).
3. A screw connection anti-loosening test measurement method according to claim 1, characterized in that the contact point of the loading screw (13) with the support (11) passes through the axial centers of the second flange (10), the force sensor (8) and the first flange (7).
4. The screw connection anti-loosening test measurement method according to claim 1, wherein the sliding groove of the sliding seat (9) is a dovetail groove.
5. The screw connection looseness prevention test measurement method according to claim 1, wherein the test screw (5) mounted with the annular force sensor (4) and the test screw (5) not mounted with the annular force sensor (4) are arranged at intervals.
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| CN110243685B (en) * | 2019-07-25 | 2021-09-03 | 洛阳理工学院 | Bolt connection strength comprehensive analysis experiment system |
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