Measuring device for torsion-tension relation and friction coefficient of single-sided installation fastener

Abstract

The utility model discloses a device for measuring a torsion-tension relation and a friction coefficient of a single-side-mounted fastener, which can accurately measure data such as tightening torque T, pre-tightening force F, thread friction torque Tt, torsion angle and rotating speed of a single-side-mounted threaded fastener in the whole mounting process. Parameters such as a torque coefficient K, a thread friction coefficient [mu] t, a friction torque Tb (Tb = T-Tt) of a rotary supporting surface, a friction coefficient [mu] b of the supporting surface and the like can be calculated according to a related formula of a torsion-tension relation of thread fastening, and meanwhile, the problem of disassembly after installation is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of thread fastener connection measurement, specifically relates to a kind of measurement device of single-sided installation fastener torsion and friction coefficient. BACKGROUND

[0002] Typical thread fastener fastening connection refers to the connection structure of bolt, nut and clamped piece, and typical thread fastener fastening connection (such as shown in FIG. 1) is shown in FIG. 1. In engineering, the installation of thread fastener is usually realized by applying a certain tightening torque or torsion angle or pre-tightening force to the bolt or nut. During the installation or disassembly process, the driving side rotates, and the other side generally needs to be stopped. The feature is that it is generally completed on both sides of the clamped piece. The torsion and tension relationship of the fastener can be obtained on the ordinary torsion and tension testing machine. Figure 1

[0003] In some specific occasions in engineering, the fastener can only be inserted into the installation hole from one side of the clamped piece and fixed. At this time, a single-sided installation fastener is needed. The commonly used single-sided installation fastener is shown in FIG. 2, which includes a pin body B1, a core rod bolt B2, a pin sleeve B3 and a nut B4. The inside of the pin body B1 and the pin sleeve B3 is a through hole for passing through the core rod bolt B2. The load end of the pin body B1 is a conical body, and the other end is a conical inclined surface which is connected with the inner taper of the pin sleeve B3. The other end of the pin sleeve B3 is connected with the nut B4, and the connecting surface is provided with teeth. When the core rod bolt B2 is tightened, the nut B4 is stopped. The core rod bolt B2 penetrates the pin body B1, the pin sleeve B3 and the nut B4 to engage. Rotating the core rod bolt B2 and the nut B4 produces axial movement, pushes the pin sleeve B3 to move towards the pin body B1, and gradually expands the outer circle of the inner taper of the pin sleeve B3. When the expanded end surface of the pin sleeve B3 contacts the clamped piece, end face bending deformation occurs. When the tightening torque reaches a predetermined value, the deformation of the pin sleeve B3 reaches the best state, and the loading head of the core rod bolt B2 is broken (as shown in FIG. 3), achieving the purpose of single-sided installation and clamping the clamped piece (B5, B6). Figure 2 Figure 3

[0004] The measurement of the torsion and tension relationship and the friction coefficient of the single-sided installation fastener is the basis for guiding its design and installation. The tightening torque of the single-sided installation fastener will be converted into clamping force, which is usually referred to as pre-tightening force. The conversion relationship between the tightening torque and the pre-tightening force is called torque coefficient, which can be represented by the following formula:

[0005] T=kdF

[0006] ​​​k is called the torque coefficient, d is the nominal diameter of the bolt or nut, T is the tightening torque, and F is the pre-tightening force. In engineering, for a threaded fastening connection at a specific position, the designer needs to determine the pre-tightening force required during installation based on conditions such as load, and then calculate the required tightening torque or torsion angle through the formula, and the obtained tightening torque or torsion angle is used to guide the installation operation.

[0007] The torque-tension relationship of threaded fastening can also be expressed by the following formula:

[0008]

[0009] where T is the tightening torque, μ b is the support surface friction coefficient, r b is the effective radius of the support surface, p is the thread pitch, μ t is the thread friction coefficient, r t is the effective radius of the thread, is the thread profile angle. The first term on the right side of the above formula is the support surface friction torque, which can be represented by the symbol T b ; the second term is the equivalent thread friction torque, which can be represented by the symbol T t , that is:

[0010] T b =Fμ b r b

[0011]

[0012] In the prior art, the detection of the mechanical properties of single-sidedly installed fasteners is characterized by single-sided installation and loading test. However, due to the asymmetric stress caused by single-sided contact, bending moment error is easily caused. At the same time, most devices only support static / quasi-static loading, and dynamic load simulation is insufficient, which easily leads to an increase in fatigue life prediction deviation. In addition, the prior art also has the defect that the test piece is not easy to disassemble after single-sided installation and loading.

[0013] Therefore, it is necessary to provide a method for accurately measuring the torque-tension relationship and friction coefficient of a single-sidedly installed fastener, which is easy to disassemble the test piece. Practical new type content

[0014] The purpose of the present application is to provide a device for measuring the torque-tension relationship and friction coefficient of a single-sidedly installed fastener to solve the problems of the prior art.

[0015] In order to achieve the above-mentioned purpose, the present application specifically adopts the following technical solutions:

[0016] The present application provides a device for measuring the torque-tension relationship and friction coefficient of a single-sidedly installed fastener, comprising:

[0017] The loading frame is composed of a fixed carrier, an adjusting wedge, an adjusting screw and a movable carrier, the fixed carrier is used for mounting the tension-torsion composite sensor, the movable carrier is used for mounting the single-sided mounting fastener, the movable carrier is axially displaced along the single-sided mounting fastener, is rigidly positioned with the fixed carrier, and the position is controllable through the adjusting wedge and the adjusting screw, the single-sided mounting fastener is axially positioned and circumferentially stopped through the bearing disc and the stopper pressing plate, and is connected with the movable carrier through the stopper clamp

[0018] The tension-torsion composite sensor is mounted on the fixed carrier, is connected with the single-sided mounting fastener through the stopper clamp, and is used for measuring the pre-tightening force F and the thread friction torque T of the single-sided mounting fastener t ;

[0019] The rotary torque and angle sensor is connected with the single-sided mounting fastener loading head through the clamp, and is used for measuring the tightening torque T and the torsion angle of the test piece.

[0020] Further, the fixed carrier is a bent plate structure, the lower end surface of the fixed carrier is connectable with the application bench, the vertical surface of the fixed carrier is perpendicular to the lower end surface, the center of the fixed carrier is a stepped hole, the stepped hole is matched with the tension-torsion composite sensor, and the tension-torsion composite sensor is rigidly constrained through the circumferentially distributed fastening screws.

[0021] Further, the tension-torsion composite sensor is a cage structure, the right end surface of the tension-torsion composite sensor is a stepped shaft structure, the outer step is rigidly connected with the fixed carrier, and the left end surface of the tension-torsion composite sensor is an inner step through-hole structure, the inner step through-hole is used for mounting the stopper clamp.

[0022] Further, the inner step through-hole of the tension-torsion composite sensor is provided with a pin for mounting the stopper clamp, so that the stopper clamp is axially and circumferentially constrained with the tension-torsion composite sensor, the inner step hole end surface of the tension-torsion composite sensor is perpendicular to the center, and two cylindrical pin holes are uniformly distributed for mounting two cylindrical pin shafts, thereby constraining the circumferential rotation of the stopper clamp, so that the tension-torsion composite sensor can measure the pre-tightening force F and the thread torque T of the single-sided mounting fastener t .

[0023] Further, the stopper clamp is a stepped bowl structure, the outer end surface of the stopper clamp is provided with two symmetrically and uniformly distributed grooves for clamping the two cylindrical pin shafts of the tension-torsion composite sensor, and is used for transmitting the thread torque T of the single-sided mounting fastener to the tension-torsion composite sensor t The inner end surface of the stopper clamp is perpendicular to the center, the center through-hole is matched with the outer cylindrical gap of the single-sided mounting fastener, the pre-tightening force F and the thread torque T of the single-sided mounting fastener t are transmitted to the tension-torsion composite sensor through the stopper clamp, and the pre-tightening force F and the thread torque T of the single-sided mounting fastener are measured through the tension-torsion composite sensort .

[0024] Further, the center of the movable carrier is a stepped through hole, and the stepped end surface of the movable carrier is perpendicular to the stepped through hole and is used for mounting the bearing disc and rigidly connecting through a screw.

[0025] Further, the bearing disc is a disc structure, the center of which is a conical through hole, and the conical surface is matched with the end conical surface of the test piece to constrain the axial movement of the test piece, and the end surface is symmetrically arranged with four light holes for mounting the fastening screws; the inner hole of the bearing disc is slightly larger than the outer diameter of the test piece and is used for passing through the test piece; and the end surface of the bearing disc is provided with two threaded holes for fastening the stop pressing plate.

[0026] Further, the stop pressing plate is symmetrically distributed with two through holes at two ends, and the center distance is the same as that of the threaded holes on the end surface of the bearing disc, and the stop pressing plate is connected with the bearing disc through a screw, and the pressure of the end surface protruding step of the stop pressing plate on the single-sided mounting fastener can be controlled by controlling the pressing force of the screw, so that the nail body of the single-sided mounting fastener is constrained from rotating.

[0027] Further, the fixed carrier, the adjusting wedge block, the adjusting lead screw and the movable carrier form a bearing frame, the movable carrier is moved left and right along the guide column group and the guide rail group through cooperation of the adjusting wedge block and the adjusting lead screw; the guide rods of the guide column group are rigidly mounted on the end surface of the movable carrier and are symmetrically distributed on the four corners of the movable carrier and are perpendicular to the movable carrier, and the linear bearings of the four sets of guide column groups are rigidly mounted on the end surface of the fixed carrier and are perpendicular to the fixed carrier, so that parallel displacement of the movable carrier relative to the fixed carrier is realized.

[0028] The guide rail group is mounted on the two inclined surfaces of the adjusting wedge block, the sliders on the two sides are respectively mounted on the end surfaces of the fixed carrier and the movable carrier, the vertical movement of the adjusting wedge block drives the horizontal movement of the movable carrier, and the relative position of the movable carrier and the fixed carrier can be controlled by adjusting the vertical position of the adjusting wedge block.

[0029] Further, the end of the adjusting lead screw is connected with the upper end surface of the adjusting wedge block and is constrained by a pin, the adjusting lead screw can be freely rotated, the vertical movement of the adjusting lead screw drives the vertical movement of the adjusting wedge block, the upper end of the adjusting lead screw is engaged with the nut fixed to the fixed carrier, the adjusting lead screw is rotated, the adjusting wedge block moves vertically, and then the horizontal position of the movable carrier is moved.

[0030] Compared with the prior art, the device has the following beneficial effects:

[0031] The device for measuring the torsion and friction coefficient of the single-sided mounting fastener can accurately measure the tightening torque T, the pre-tightening force F and the thread friction torque T of the single-sided mounting threaded fastener in the whole mounting processt , the torsion angle and the rotation speed and the like data, and the torque coefficient K, the thread friction coefficient μ t , the friction torque T of the rotation support surface b (T b =T-T t ), the support surface friction coefficient μ b and the like parameters can be calculated according to the related formula of the torsion and tension relationship of the thread fastening, and the dismounting problem after the installation is solved. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a schematic view of a connection structure of a typical threaded fastener; Figure 1 , A1 is a bolt, A2 is a nut, A3 is a clamped piece 1, and A4 is a clamped piece 2.

[0033] Figure 2 is a schematic view of a structure of a commonly used single-side installation fastener (test piece); Figure 2 , B1 is a pin body, B2 is a core rod bolt, B3 is a pin sleeve, and B4 is a nut.

[0034] Figure 3 is a schematic view of a structure of a broken head after loading of a commonly used single-side installation fastener. Figure 3 , B2 is a core rod bolt, B5 is a clamped piece 3, and B6 is a clamped piece 4.

[0035] Figure 4 is a schematic view of installation of a tension-torsion composite sensor and a fixed bearing body provided by an embodiment of the present application.

[0036] Figure 5 is a schematic view of installation of a tension-torsion composite sensor and a stop clamp provided by an embodiment of the present application.

[0037] Figure 6 is a schematic view of installation of a movable bearing body and a bearing disc provided by an embodiment of the present application. Figure 6 , (a) is a side view, and (b) is a schematic view of a three-dimensional structure.

[0038] Figure 7 is a schematic view of installation of a bearing disc and a stop pressing plate provided by an embodiment of the present application. Figure 7 , (a) is a side view, and (b) is a front view.

[0039] Figure 8 is a schematic view of a structure of a loading frame provided by an embodiment of the present application. Figure 8 , (a) is a left view, (b) is a front view, and (c) is a right view.

[0040] Figure 9The structure diagram of the measuring device for the torsion and tension relationship and friction coefficient of the single-side installation fastener is provided for the embodiments of the present application Figure 1 .

[0041] Figure 10 The structure diagram of the measuring device for the torsion and tension relationship and friction coefficient of the single-side installation fastener is provided for the embodiments of the present application Figure 2 . DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0043] The commonly used single-side installation fastener currently comprises a nail body B1, a core rod bolt B2, a nail sleeve B3 and a nut B4, as shown in the drawings. Figure 3 The inner part of the nail body B1 and the nail sleeve B3 is a through hole for passing through the core rod bolt B2. The bearing end of the nail body B1 is a conical body, and the other end conical inclined surface is connected with the inner taper of the nail sleeve B3. The other end of the nail sleeve B3 is connected with the nut B4, and the connecting surface is provided with teeth. When the core rod bolt B2 is tightened, the nut B4 is stopped from rotating. The core rod bolt B2 penetrates the nail body B1, the nail sleeve B3 and the nut B4 to engage. Rotating the nut B4 of the core rod bolt B2 produces axial movement, pushes the nail sleeve B3 to move towards the nail body B1, and gradually expands the outer circle of the inner taper of the nail sleeve B3. When the expanded end surface of the nail sleeve B3 contacts the clamped part, end surface bending deformation is generated. When the tightening torque reaches a predetermined value, the deformation of the nail sleeve B3 reaches the best state, and the loading head of the core rod bolt B2 is broken (as shown in the drawings). The purpose of single-side installation and clamping the clamped part (B5, B6) is achieved. Figure 9

[0044] The measuring device for the torsion and tension relationship and friction coefficient of the single-side installation fastener provided by the present application comprises a fixed bearing body 1, a tension and torsion composite sensor 2, an adjusting wedge block 3, an adjusting lead screw 4, a stop clamp 5, a movable bearing body 6, a bearing disc 7, a stop pressing plate 8, a clamp 9 and a rotating torque and torsion angle sensor 10, as shown in the drawings. Figure 10 Figure 4

[0045] ​​​The fixed carrier 1, the adjusting wedge 3, the adjusting screw 4 and the movable carrier 6 constitute a loading frame, the fixed carrier 1 is used for mounting the tensile-torsional composite sensor 2; the movable carrier 6 is used for mounting the single-sided mounting fastener, the movable carrier 6 is axially displaced along the single-sided mounting fastener, is rigidly positioned with the fixed carrier 1, and the position is controllable through the adjusting wedge 3 and the adjusting screw 4; the single-sided mounting fastener is axially positioned and circumferentially stopped through the bearing disc 7 and the stopper pressing plate 8;

[0046] The tensile-torsional composite sensor 2 is mounted on the fixed carrier 1, is connected with the single-sided mounting fastener through the stopper clamp 5, and is used for measuring the pre-tightening force F and the thread friction torque T of the single-sided mounting fastener t ;

[0047] The rotating torque and angle sensor 10 is connected with the single-sided mounting fastener loading head through the clamp 9, and is used for measuring the tightening torque T and the torsion angle of the test piece.

[0048] Specifically, as shown in Figure 4 The fixed carrier 1 is a bent plate structure, the lower end surface of the fixed carrier 1 can be connected with an application rack, the vertical surface of the fixed carrier 1 is perpendicular to the lower end surface, the center of the fixed carrier 1 is a stepped hole, the stepped hole is matched with the tensile-torsional composite sensor 2, and the tensile-torsional composite sensor 2 is rigidly constrained through circumferentially distributed fastening screws.

[0049] As shown in Figure 5 The tensile-torsional composite sensor 2 is a cage structure, the right end surface of the tensile-torsional composite sensor 2 is a stepped shaft structure, the outer step is rigidly connected with the fixed carrier 1; the left end surface of the tensile-torsional composite sensor 2 is an inner step through hole structure, and the inner step through hole is used for mounting the stopper clamp 5.

[0050] As shown in Figure 6 The inner step through hole of the tensile-torsional composite sensor 2 is provided with the stopper clamp 5 through the pin, so that the stopper clamp 5 is axially and circumferentially constrained with the tensile-torsional composite sensor 2, the inner step hole end surface of the tensile-torsional composite sensor 2 is perpendicular to the center, and two cylindrical pin holes are uniformly distributed, used for mounting two cylindrical pin shafts, thereby constraining the circumferential rotation of the stopper clamp 5, so that the tensile-torsional composite sensor 2 can measure the pre-tightening force F and the thread torque T t .

[0051] The stopper clamp 5 is a stepped bowl structure, the outer end surface of the stopper clamp 5 is provided with two symmetrically and uniformly distributed grooves, clamped on the two cylindrical pin shafts of the tensile-torsional composite sensor 2, and used for transmitting the thread torque T of the single-sided mounting fastener tThe inner end surface of the stop clamp 5 is perpendicular to the center, the center through hole is matched with the outer cylindrical gap of the single-sided mounting fastener, the pre-tightening force F and the screw torque T of the single-sided mounting fastener t The pre-tightening force F and the screw torque T of the single-sided mounting fastener are transmitted to the tensile-torsional composite sensor 2 through the stop clamp 5 and measured by the tensile-torsional composite sensor 2 t .

[0052] As shown in Figure 7 , the center of the movable carrier 6 is a stepped through hole, the stepped end surface of the movable carrier 6 is perpendicular to the stepped through hole, and the stepped through hole is coaxial with the tensile-torsional composite sensor 2.

[0053] As shown in Figure 7 , the bearing disc 7 is a disc structure, the center is a conical through hole, the conical surface is matched with the end surface of the test piece, and the axial movement of the test piece is constrained, the end surface is symmetrically arranged with four light holes for mounting the fastening screw for constraining the circumferential movement of the test piece; the inner hole of the bearing disc 7 is slightly larger than the outer diameter of the test piece, and is used for passing through the test piece; the end surface of the bearing disc is provided with two threaded holes for fastening the stop pressing plate 8.

[0054] As shown in Figure 8 , the stop pressing plate 8 is symmetrically distributed with two through holes at both ends, the center distance is the same as the threaded hole of the bearing disc end surface, and the stop pressing plate 8 is connected with the bearing disc through the screw, and the pressing force of the stop pressing plate 8 end surface protruding step can be controlled by controlling the pressing force of the screw, so as to constrain the rotation of the nail body of the single-sided mounting fastener.

[0055] As shown in Figure 2 , the fixed carrier 1, the adjusting wedge block 3, the adjusting lead screw 4 and the movable carrier 6 form a bearing frame, and the movable carrier 6 moves left and right along the guide column group 11 and the guide rail group 12 through the cooperation of the adjusting lead screw 4 and the adjusting wedge block 3.

[0056] The guide rods of the guide column group 11 are rigidly mounted on the end surface of the movable carrier 6 and are symmetrically distributed on the four corners of the movable carrier 6, and are perpendicular to the movable carrier 6, and four sets of linear bearings of the guide column group 11 are rigidly mounted on the end surface of the fixed carrier 1 and are perpendicular to the fixed carrier 1, so as to realize the parallel displacement of the movable carrier 6 relative to the fixed carrier 1.

[0057] The guide rail group 12 is installed on the two inclined surfaces of the adjusting wedge block 3, the sliders on both sides are respectively installed on the end surfaces of the fixed carrier 1 and the movable carrier 6, and the vertical movement of the adjusting wedge block 3 drives the horizontal movement of the movable carrier 6, and the relative position of the movable carrier 6 and the fixed carrier 1 can be controlled by adjusting the vertical position of the adjusting wedge block 3.

[0058] The end of the adjusting screw 4 is connected with the upper end surface of the adjusting wedge 3, and is constrained by a pin. The adjusting screw 4 can rotate freely. The up-and-down movement of the adjusting screw 4 drives the up-and-down movement of the adjusting wedge 3. The upper end of the adjusting screw 4 is engaged with a nut fixed to the fixed carrier 1. By rotating the adjusting screw 4, the adjusting wedge 3 moves up and down, and the horizontal position of the movable carrier 6 is moved.

[0059] For the commonly used single-sided installation fastener (such as shown in Figure 3 and Figure 9 ), when measured by using the above measuring device (such as shown in ​ and 10 ), the specific steps are as follows:

[0060] S1, fix the fixed carrier 1.

[0061] S2, rigidly install the tensile-torsional composite sensor 2 on the end surface of the fixed carrier 1 by means of a screw, so that the fixed end of the tensile-torsional composite sensor 2 is axially and circumferentially constrained to the fixed carrier 1, so that the tensile-torsional composite sensor can measure the pre-tightening force and the torque of the loading end.

[0062] S3, install the stop clamp 5 on the inner end surface of the tensile-torsional composite sensor 2 by means of a pin, and axially and circumferentially constrain the stop clamp 5 to the tensile-torsional composite sensor 2; so that the tensile-torsional composite sensor can measure the pre-tightening force (F) and the thread torque (T t ) received by the single-sided installation fastener (test piece).

[0063] S4, displace the movable carrier 6 along the axial direction of the test piece, and rigidly position it with the fixed carrier 1 by means of a screw, and realize controllable position by means of the adjusting wedge 3 and the adjusting screw 4.

[0064] S5, rigidly install the carrier disc 7 on the end surface of the movable carrier 6 by means of a screw, and axially and circumferentially constrain it.

[0065] S6, install the single-sided installation fastener into the hole of the carrier disc 7, and then install the stop pressing plate 8, and press the end surface of the single-sided installation fastener by means of a screw, so as to realize axial positioning and circumferential rotation stopping of the test piece.

[0066] S7, connect the rotating torque and angle sensor 10 with the loading head of the single-sided installation fastener by means of the clamp 9.

[0067] The rotating torque and angle sensor 10 is used to measure the tightening torque (T) and the torsion angle of the single-sided installation fastener (test piece).

[0068] S8, by adjusting the rotation of the screw rod 4 to drive the movable carrier 6 to move horizontally, adjust to the required distance between the fixed carrier 1, and then load the test piece.

[0069] S9, by rotating the torque and torsion angle sensor 10 to obtain the tightening torque T and the torsion angle, and by the pull-torsion composite sensor to obtain the pre-tightening force F and the thread friction torque T of the test piece t ; by the pre-tightening force F, the tightening torque T, and the thread torque T t , the torque coefficient K is calculated, or the thread friction coefficient μ t is calculated, or the support surface friction coefficient μ b is calculated.

[0070] Specifically, the pre-tightening force F, the tightening torque T, and the following formula are used to calculate the torque coefficient K:

[0071] K=T / (D· F)

[0072] Where D is the diameter of the single-sided installation fastener nut.

[0073] The thread torque T t and the following formula are used to calculate the thread friction coefficient μ t :

[0074]

[0075] Where p is the single-sided installation fastener thread pitch, r t is the effective radius of the thread surface, is the thread tooth type angle;

[0076] The support surface friction torque T t is obtained by subtracting the thread torque T b from the tightening torque T, and the support surface friction coefficient μ b is calculated based on the following formula:

[0077] μ b= T b / (F· r b )

[0078] Where r b is the effective friction radius of the support surface.

[0079] S10, when the experiment is finished, the single-sided installation fastener loading head is twisted off, the adjusting screw rod 4 is rotated to the lowest position, at this time the distance between the movable carrier 6 and the fixed carrier 1 is the smallest, the pre-tightening force of the single-sided installation fastener is unloaded, and the single-sided installation fastener nut and the core rod bolt can be easily separated.

[0080] The position of the adjusting wedge 3 is controlled by rotating the adjusting screw 4, that is, the distance between the movable carrier 6 and the fixed carrier 1 is controlled; for a small load model, the torque for driving the adjusting screw 4 is not large, and manual operation can be easily twisted, and a manual driving mode is adopted; for a larger load model, the torque for driving the adjusting screw 4 is relatively large, and manual operation is relatively laborious at this time, and an electric driving mode is adopted.

[0081] In conclusion, the test method provided by the utility model can not only accurately measure the torque T, the pre-tightening force F, the thread friction torque Tt, the torsion angle, the rotation speed and other data of the unilateral installation thread fastener in the whole installation process, but also can calculate the torque coefficient K, the thread friction coefficient μ t , the friction torque T b (T b =T-T t ) of the rotating support surface and the support surface friction coefficient μ b and other parameters according to the relevant formula of the torsion and tension relationship of the thread fastening, and simultaneously solves the disassembly problem after the installation is completed.

[0082] The above is only a preferred embodiment of the utility model, and does not limit the utility model, and the patent protection scope of the utility model is subject to the claims, and any equivalent structural changes made according to the content of the specification and the drawings of the utility model should be included in the protection scope of the utility model.

Claims

1. A device for measuring the torsional relationship and coefficient of friction of a single-sided mounting fastener, characterized by, The application relates to a loading frame, a rotating torque and angle sensor and a single-surface mounting fastener. The fixed carrier (1) is a bent plate structure, the lower end surface of the fixed carrier (1) can be connected with an application rack, the vertical surface of the fixed carrier (1) is perpendicular to the lower end surface, the center of the fixed carrier (1) is a stepped hole, the stepped hole is matched with a tension-torsion composite sensor (2), and the tension-torsion composite sensor (2) is rigidly constrained through uniformly distributed fastening screws in the circumferential direction. Tension-torsion composite sensor (2) is installed on fixed carrier (1), and is connected with single-sided mounting fastener through stop clamp (5), and is used for measuring pre-tightening force F and thread friction torque T of single-sided mounting fastener t ; The tension-torsion composite sensor (2) is a cage structure, the right end surface of the tension-torsion composite sensor (2) is a stepped shaft structure, the outer step is rigidly connected with the fixed carrier (1); the left end surface of the tension-torsion composite sensor (2) is an inner stepped through hole structure, and the inner stepped through hole is used for mounting a stop clamp (5).

2. The measuring device for the torsion-lax relation and the friction coefficient of a single-side mounting fastener according to claim 1, wherein The center of the movable carrier (6) is a stepped through hole, the stepped end surface of the movable carrier (6) is perpendicular to the stepped through hole and is used for mounting a bearing disc (7) through screw rigid connection, and the stepped hole is coaxial with the tension-torsion composite sensor (2).

3. The apparatus for measuring the torsion-lifting relationship and the friction coefficient of a one-side mounting fastener according to claim 1, wherein The bearing disc (7) is a disc structure, the center is a conical through hole, the conical surface is matched with the end conical surface of a test piece, axial movement of the test piece is constrained, the end surface is symmetrically provided with four light holes and is used for mounting fastening screws; the inner hole of the bearing disc (7) is slightly larger than the outer diameter of the test piece and is used for passing through the test piece; two threaded holes are arranged on the end surface of the bearing disc (7) and are used for fastening a stop pressing plate (8).

4. The apparatus for measuring the torsion and the friction coefficient of a one-side mounting fastener according to claim 3, wherein The inner step through hole of the tensile-torsional composite sensor (2) is installed with the pin mounting stop clamp (5), so that the stop clamp (5) is axially and circumferentially constrained with the tensile-torsional composite sensor (2), the inner step hole end surface of the tensile-torsional composite sensor (2) is perpendicular to the center, and is uniformly distributed with two cylindrical pin holes, which are used to install two cylindrical pin shafts, thereby constraining the circumferential rotation of the stop clamp (5), so that the tensile-torsional composite sensor (2) can measure the pre-tightening force F and the thread torque T of the single-side installed fastener t .

5. The apparatus for measuring the torsion-lifting relationship and the coefficient of friction of a one-side mounting fastener according to claim 1, wherein The stop clamp (5) is a stepped bowl structure, and the outer end face of the stop clamp (5) is provided with two symmetrical and uniformly distributed grooves, which are clamped on the two cylindrical pin shafts of the tension-torsion composite sensor (2) to transmit the thread torque T of the single-sided installation fastener t The inner end face of the stop clamp (5) is perpendicular to the center, and the center through hole is matched with the outer cylindrical gap of the single-sided installation fastener, and the pre-tightening force F and the thread torque T of the single-sided installation fastener t The pre-tightening force F and the thread torque T of the single-sided installation fastener are transmitted to the tension-torsion composite sensor (2) through the stop clamp (5) and measured by the tension-torsion composite sensor (2) t .

6. The apparatus for measuring the torsion-lifting relationship and the coefficient of friction of a one-side mounting fastener according to claim 1, wherein The stop pressing plate (8) is symmetrically provided with two through holes at two ends, the center distance is the same as that of the threaded holes on the end surface of the bearing disc, the stop pressing plate (8) is connected with the bearing disc through screws, the end surface protruding step of the stop pressing plate (8) can be controlled to press the single-surface mounting fastener through control of the pressing force of the screws, so that the rotation of the pin body of the single-surface mounting fastener is constrained.

7. The apparatus for measuring the torsion-lifting relationship and the friction coefficient of a one-side mounting fastener according to claim 1, wherein The movable carrier (6) moves leftward and rightward along a guide column group (11) and a guide rail group (12) through cooperation of the adjusting screw (4) and the adjusting wedge (3); guide rods of the guide column group (11) are rigidly mounted on the end surface of the movable carrier (6) and are symmetrically distributed on the four corners of the movable carrier (6) and perpendicular to the movable carrier (6); linear bearings of the four sets of guide column groups (11) are rigidly mounted on the end surface of the fixed carrier (1) and are perpendicular to the fixed carrier (1), so that parallel displacement of the movable carrier (6) relative to the fixed carrier (1) is realized.

8. The apparatus for measuring the torsion-lifting relationship and the coefficient of friction of a one-side mounting fastener according to claim 1, wherein ​ 9. The apparatus for measuring the torsion-lifting relationship and the coefficient of friction of a one-side mounting fastener according to claim 1, wherein ​ The guide rail group (12) is installed on two inclined surfaces of the adjusting wedge (3), and the sliding blocks on both sides are respectively installed on the end faces of the fixed carrier (1) and the movable carrier (6); the vertical movement of the adjusting wedge (3) drives the horizontal movement of the movable carrier (6); and the relative position of the movable carrier (6) and the fixed carrier (1) can be controlled by adjusting the vertical position of the adjusting wedge (3).

10. The apparatus for measuring the torsion-lax relation and the friction coefficient of a one-side mounting fastener according to claim 1, wherein The end of the adjusting screw (4) is connected with the upper end face of the adjusting wedge (3) by using a pin, the adjusting screw (4) can rotate freely, the vertical movement of the adjusting screw (4) drives the vertical movement of the adjusting wedge (3), the upper end of the adjusting screw (4) is engaged with the nut fixed on the fixed carrier (1), the adjusting wedge (3) moves vertically by rotating the adjusting screw (4), and then the horizontal position of the movable carrier (6) is moved.

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