Universal testing device for friction coefficient of screwed pipe joint and standard bolt

Abstract

The utility model relates to the technical field of machinery, and discloses a universal testing device for the friction coefficient of a screwed pipe joint and a standard bolt, which comprises a fixed supporting plate, a sensor rotating bracket and a composite sensor, and is characterized in that the sensor rotating bracket is rotationally connected to the upper end of the fixed supporting plate through a rotating bolt and a rotating nut; rotating support fixing screws are arranged on the two sides of the lower portion of the sensor rotating support, the composite sensor is installed on the sensor rotating support, and sensor fixing screws are arranged on the two sides of the upper portion of the sensor rotating support. Meanwhile, the thread friction coefficient and the supporting surface friction coefficient of the threaded pipe joint can be tested, and the thread friction coefficient and the supporting surface friction coefficient of the pipe can be tested; according to the utility model, the friction coefficient of standard bolt and nut threaded connection and the measurement of pipe joint threaded connection can be rapidly converted by rotating the composite sensor by 180 degrees, and the two measurement functions are compatible.

Description

Technical Field

[0001] The utility model relates to the technical field of machinery, in particular to a universal testing device for friction coefficients of threaded pipe joints and standard bolts. Background Art

[0002] Friction coefficient testing devices are used in the machinery industry, especially in rail transportation, automobile, wind power, aviation, chemical and other industries. They are mainly used in the fields where threaded pipe joints are used in brake lines, hydraulic lines, pneumatic lines, air conditioning lines and other pipelines in the above industries.

[0003] The existing standard bolt and nut threaded connection friction coefficient measuring device is mainly used to measure the standard bolt and nut connection. After the bolt and nut are tightened, the bolt will be subjected to tensile force. The current standard bolt and nut threaded connection friction coefficient measuring device can only withstand tensile force but not pressure. For the measurement of the friction coefficient of pipe joint threads, the existing standard bolt and nut threaded connection friction coefficient measuring device cannot be directly used. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a universal test device for friction coefficient of threaded pipe joints and standard bolts, which solves the problem that existing friction coefficient test devices cannot measure the friction coefficient of threaded pipe joints.

[0005] In order to solve the above technical problems, the technical solution provided by the utility model is: a universal testing device for the friction coefficient of threaded pipe joints and standard bolts, including a fixed support plate, a sensor rotating bracket and a composite sensor, the sensor rotating bracket is rotatably connected to the upper end of the fixed support plate by a rotating bolt and a rotating nut, rotating bracket fixing screws are provided on both sides of the lower side of the sensor rotating bracket, and are fixedly connected to both sides of the fixed support plate, the composite sensor is installed on the sensor rotating bracket, sensor fixing screws are provided on both sides of the upper side of the sensor rotating bracket, and the composite sensor is fixedly connected to the sensor rotating bracket through the two sensor fixing screws.

[0006] As an improvement, the composite sensor is provided with a sensor positioning device, which is fixed to the threaded hole of the composite sensor by means of a sensor positioning device fixing screw. The number of the sensor positioning device fixing screws is four. The sensor positioning device includes a circumferential positioning disc and an axial positioning opening cylinder. The axial positioning opening cylinder is provided with a threaded hole. The number of the threaded holes is four, making the device more practical and stable.

[0007] As an improvement, the sensor positioning device is fixed with a threaded gasket through sensor fixing screws. There are four sensor fixing screws, which are adapted to the threaded holes. The threaded gasket is provided with several threaded holes. A pipe joint is installed on the composite sensor, which is adapted to the threaded holes. Different pipe joint thread specifications can be adapted by replacing threaded gaskets with different thread specifications.

[0008] As an improvement, an embedded part is provided on the step on the inner side of the composite sensor. The embedded part is flat in shape and is also located in the U-shaped groove of the open structure of the sensor positioning device. Two threaded holes are provided above the embedded part. A support surface gasket is fixedly connected to the top of the embedded part by screws, which can test the friction torque and preload force.

[0009] As an improvement, a countersunk hole is provided at the upper end of the support surface gasket for the cylindrical head screw to sink into the support surface gasket. A conical countersunk hole is provided at the center of the support surface gasket. The size and shape of the countersunk hole match the outer dimensions of the pipe joint, making the device more stable.

[0010] The advantages of the present invention over the prior art are that the present invention can not only measure the total friction coefficient of a threaded pipe joint, but can also simultaneously test the thread friction coefficient and the supporting surface friction coefficient of the threaded pipe joint, and can also test the thread friction coefficient and the supporting surface friction coefficient of the pipe.

[0011] The utility model can also quickly switch the measurement of the friction coefficient of the standard bolt and nut thread connection and the pipe joint thread connection by rotating the composite sensor 180 degrees, and has the function of compatible measurement of the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is an assembly diagram of the present utility model.

[0013] Figure 2 It is a schematic diagram of the circumferential positioning disc and the axial positioning opening cylinder of the utility model.

[0014] Figure 3 It is a schematic diagram of the embedded and supporting gasket of the utility model.

[0015] As shown in the figure: 1. Rotation bolt; 2. Rotation nut; 3. Fixed support plate; 4. Sensor rotation bracket; 5. Composite sensor; 6. Threaded gasket fixing screw; 7. Pipe joint; 8. Threaded gasket; 9. Sensor fixing screw; 10. Rotation bracket fixing screw; 11. Sensor positioning device; 1101. Circumferential positioning disk; 1102. Axial positioning open cylinder; 12. Sensor positioning device fixing screw; 13. Embedded; 14. Support surface gasket. DETAILED DESCRIPTION

[0016] The present invention will be described in further detail below with reference to the accompanying drawings.

[0017] The utility model combines the friction coefficient detection Figures 1 to 3 A universal testing device for the friction coefficient of a threaded pipe joint and a standard bolt includes a fixed support plate 3, a sensor rotating bracket 4 and a composite sensor 5. The sensor rotating bracket 4 is rotatably connected to the upper end of the fixed support plate 3 through a rotating bolt 1 and a rotating nut 2. Rotating bracket fixing screws 10 are provided on both sides of the lower side of the sensor rotating bracket 4 and are fixedly connected to both sides of the fixed support plate 3. The composite sensor 5 is installed on the sensor rotating bracket 4. Sensor fixing screws 9 are provided on both sides of the upper side of the sensor rotating bracket 4. The composite sensor 5 is fixedly connected to the sensor rotating bracket 4 through two sensor fixing screws 9.

[0018] A sensor positioning device 11 is provided on the composite sensor 5. The sensor positioning device 11 is fixed to the threaded hole of the composite sensor 5 by means of sensor positioning device fixing screws 12. There are four sensor positioning device fixing screws 12. The sensor positioning device 11 includes a circumferential positioning disc 1101 and an axial positioning opening cylinder 1102. The axial positioning opening cylinder 1102 is provided with threaded holes. There are four threaded holes, which makes the device more practical and stable.

[0019] The sensor positioning device 11 is fixed with a threaded gasket 8 through a sensor fixing screw 9. There are four sensor fixing screws 9, which are adapted to the threaded holes. The threaded gasket 8 is provided with several threaded holes. A pipe joint 7 is installed on the composite sensor 5, and the pipe joint 7 is adapted to the threaded holes. By replacing threaded gaskets 8 with different thread specifications, different thread specifications of the pipe joint 7 can be adapted.

[0020] An inlay 13 is provided on the step on the inner side of the composite sensor 5. The inlay 13 is flat in shape. The inlay 13 is also located in the U-shaped groove of the open structure of the sensor positioning device 11. Two threaded holes are provided above the inlay 13. A supporting surface gasket 14 is fixedly connected to the top of the inlay 13 by screws, which can test the friction torque and preload force. Two countersunk holes are provided on the upper end of the supporting surface gasket 14 for cylindrical head screws to sink into the supporting surface gasket 14. A conical countersunk hole is provided at the center of the supporting surface gasket 14. The size and shape of the countersunk hole match the outer dimensions of the pipe joint 7, making the device more stable.

[0021] During actual use of this device, the two rotating bracket fixing screws 10 are loosened, the sensor rotating bracket 4 is rotated to perform the threaded connection test of the pipe joint 7, and the two rotating bracket fixing screws 10 are tightened after rotation. The composite sensor 5 is assembled to the sensor rotating bracket 4 according to the friction coefficient test requirements of the pipe joint 7, and the two sensor fixing screws 9 are tightened. The sensor positioning device 11 is tightened and fixed to the composite sensor 5 with four sensor positioning device fixing screws 12, and the support surface gasket 14 is tightened to the threaded hole of the embedded 13 with two fixing screws to form a whole. The inlay 13 is placed on the inner step of the composite sensor 5, and the two positioning pins of the composite sensor 5 are passed through the two bolt holes of the inlay 13. According to the thread specifications of the pipe joint 7, a suitable threaded gasket 8 is selected, and the pipe joint 7 is screwed into the threaded hole of the threaded gasket 8. The screwing amount of the pipe joint 7 is adjusted so that the pipe joint 7 contacts the tapered hole of the support surface gasket 14. The threaded gasket 8 is positioned and initially assembled to the threaded hole of the U-shaped bracket of the sensor positioning device 11 with four threaded gasket fixing screws 6. Then, the pipe joint 7 is slightly unscrewed half a turn, and the four threaded gasket fixing screws 6 are tightened.

[0022] Finally, adjust the position of the integral test sensor and connect it to the tightening tool to perform the tightening test. During the tightening process, the total tightening torque, thread torque, and preload can be measured. The total torque of the threaded pipe joint is measured by the tightening tool's torque sensor or a separate torque sensor. The thread torque of the threaded pipe joint can be obtained by subtracting the friction torque from the total torque. This ultimately measures the pressure, total torque, thread torque, and friction torque during tightening of the threaded pipe joint. This allows the calculation of the total friction coefficient μtot, thread friction coefficient μth, and support surface friction coefficient μb of the pipe joint 7 according to the method in GB / T 16823.3 standard.

[0023] Finally, the friction coefficient test device for threaded pipe joints can measure the various friction coefficients of threaded pipe joints (total friction coefficient, thread friction coefficient and support surface friction coefficient), thereby achieving the purpose of measuring the friction coefficient of the pipe joint 7 and enabling quality control according to customer requirements.

[0024] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. A universal testing device for the friction coefficient of threaded pipe joints and standard bolts, comprising a fixed support plate (3), a sensor rotating bracket (4) and a composite sensor (5), characterized in that: The sensor rotating bracket (4) is rotatably connected to the upper end of the fixed support plate (3) through a rotating bolt (1) and a rotating nut (2); rotating bracket fixing screws (10) are provided on both sides below the sensor rotating bracket (4) and are fixedly connected to both sides of the fixed support plate (3); the composite sensor (5) is mounted on the sensor rotating bracket (4); sensor fixing screws (9) are provided on both sides above the sensor rotating bracket (4); and the composite sensor (5) is fixedly connected to the sensor rotating bracket (4) through the two sensor fixing screws (9).

2. The universal testing device for friction coefficient of threaded pipe joints and standard bolts according to claim 1, characterized in that: The composite sensor (5) is provided with a sensor positioning device (11), the sensor positioning device (11) is fixed to the threaded hole of the composite sensor (5) by means of sensor positioning device fixing screws (12), the number of the sensor positioning device fixing screws (12) being four, the sensor positioning device (11) comprising a circumferential positioning disc (1101) and an axial positioning opening cylinder (1102), the axial positioning opening cylinder (1102) being provided with threaded holes, the number of the threaded holes being four.

3. The universal testing device for friction coefficient of threaded pipe joints and standard bolts according to claim 2, characterized in that: The sensor positioning device (11) is fixedly mounted with a threaded gasket (8) via sensor fixing screws (9), wherein the number of the sensor fixing screws (9) is four and the screws are adapted to the threaded holes, and the threaded gasket (8) is provided with a plurality of threaded holes, and a pipe joint (7) is mounted on the composite sensor (5), and the pipe joint (7) is adapted to the threaded holes.

4. The universal testing device for friction coefficient of threaded pipe joints and standard bolts according to claim 3, characterized in that: An inlay (13) is provided on the step on the inner side of the composite sensor (5), the inlay (13) being flat in shape, and the inlay (13) is also located in the U-shaped groove of the open structure of the sensor positioning device (11), two threaded holes are provided above the inlay (13), and a support surface gasket (14) is fixedly connected above the inlay (13) by screws.

5. The universal testing device for friction coefficient of threaded pipe joints and standard bolts according to claim 4, characterized in that: The upper end of the support surface gasket (14) is provided with two countersunk holes for cylindrical head screws to sink into the support surface gasket (14). The center of the support surface gasket (14) is provided with a conical countersunk hole, and the size and shape of the countersunk hole match the outer dimensions of the pipe joint (7).

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