Nut fatigue testing device

Abstract

The utility model belongs to the technical field of thread fatigue testing equipment, and discloses a nut fatigue testing device, which comprises a linear driving mechanism, a nut rotating assembly and a screwing fixing assembly, and is characterized in that the nut rotating assembly is driven by the linear driving mechanism to do linear reciprocating motion along a first direction; the nut rotating assembly comprises a rotating driving part and a nut fixing assembly, the nut fixing assembly is driven by the rotating driving part to rotate, and the rotating fixing assembly is arranged in the first direction; the nut fixing assembly comprises a first clamping piece and a second clamping piece, the first clamping piece and the second clamping piece are detachably connected, and a clamping position for fixing a nut is formed between the first clamping piece and the second clamping piece. The non-standard thread fatigue life testing device can be suitable for non-standard thread fatigue life testing, not only can be convenient for mounting and dismounting of non-standard nuts, but also can be used for fixing non-standard nuts with different sizes and different shapes, and is wider in application range, simpler in overall structure, low in cost and better in portability.

Description

Technical Field

[0001] The utility model belongs to the technical field of thread fatigue testing equipment, and particularly relates to a nut fatigue testing device. Background Art

[0002] The thread fatigue life test usually simulates the thread connection between a component with an external thread and a component with an internal thread several times, that is, the use process is simulated by many reciprocating connections between the two. During the connection simulation, the torque during the connection process is detected by detection components such as torque sensors. The torque reflects the fatigue life to determine whether it meets the requirements.

[0003] Current thread fatigue testing equipment is primarily designed for standardized bolts and nuts. It cannot be directly applied to non-standard bolts and nuts, such as welding gun tips and nuts, due to differences in size and material. Furthermore, the equipment is automated, resulting in high costs and being bulky. The tooling used to secure the nut is a sleeve-type structure, making it difficult to disassemble and replace, and the applicable sizes are relatively limited, making it inconvenient to use. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide a nut fatigue testing device to solve the problems that existing thread fatigue testing equipment is not suitable for non-standard nut thread testing and the tooling used to fix the nut is not convenient for disassembly, assembly and replacement.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A nut fatigue testing device includes a linear drive mechanism, a nut rotating assembly, and a screw-on fixing assembly. The nut rotating assembly is driven by the linear drive mechanism to perform linear reciprocating motion along a first direction. The nut rotating assembly includes a rotary drive component and a nut fixing assembly. The nut fixing assembly is driven to rotate by the rotary drive component. The screw-on fixing assembly is arranged in the first direction. The nut fixing assembly includes a first clamping member and a second clamping member. The first clamping member and the second clamping member are detachably connected, and a clamping position for fixing the nut is formed therebetween. The screw-on fixing assembly includes a fixing member and a torque detection member. The fixing member is used to install a screw-on component for connecting the nut. The first clamping member and the second clamping member fix the target part by clamping. Compared with the fixing method of the sleeve, this fixing method can facilitate the clamping and fixing of non-standard nuts of different sizes and shapes. In addition, the detachable connection between the first clamping member and the second clamping member facilitates disassembly and assembly, and facilitates the installation of the nut, making the operation faster. The linear drive mechanism can move the nut rotating assembly connected thereto in a first direction to perform feed motion before screwing. During screwing, the nut rotating assembly can drive the nut fixing assembly to which the nut is fixed to rotate, so that the nut can be screwed onto components such as bolts through rotation, and torque data can be obtained through the reciprocating movement of the linear drive mechanism and the torque detection component during the screwing process, thereby enabling the test of thread fatigue life.

[0007] In a possible implementation, the nut rotating assembly further includes a transmission shaft, which is driven to rotate by the rotary drive component, and the first clamping member or the second clamping member is fixedly connected to the transmission shaft. The transmission shaft can connect the first clamping member and the second clamping member to the nut rotating assembly, thereby improving the reliability of the transmission structure.

[0008] In a possible implementation, the transmission shaft is provided with an axial cavity for the screw-on component to extend into. Since the screw-on component will pass through the nut during the screw-on process, the provision of the transmission shaft axial cavity facilitates the screw-on component to extend into the axial cavity, thereby providing an escape space.

[0009] In a possible implementation, the nut rotation assembly further includes a connection base, a rotary drive component disposed on the connection base connected to the linear drive mechanism, and an output shaft of the rotary drive component detachably connected to the transmission shaft. The rotary drive component can drive the connection shaft to rotate, and connecting the rotary drive component to the connection base facilitates providing stable support. Furthermore, the detachable connection of the transmission shaft to the output end of the rotary drive component facilitates simultaneous replacement of the transmission shaft and the first and second clamping members to facilitate thread testing of non-standard nuts of different sizes or shapes.

[0010] In a possible implementation, the transmission shaft is rotatably connected to the connecting seat via a bearing. By using the connecting seat as a support and rotating in conjunction with the bearing, the coaxiality and stability of the nut during rotation can be further improved.

[0011] In a possible implementation, the first and second clamping members are both C-shaped and symmetrical, with the ends of the first and second clamping members connected by fasteners. The C-shaped clamping structure of the first and second clamping members allows for the clamping of non-standard bolts with varying shapes. Furthermore, the use of fasteners such as bolts for connection facilitates adjustment of the degree of compression and the securing of non-standard nuts of varying sizes, extending applicability and providing greater convenience.

[0012] In a possible implementation, the linear drive mechanism includes a mounting base, a second motor, a screw, and a slider. The second motor is mounted on the mounting base, and the output shaft of the second motor is connected to the screw. The screw passes through a slider that is slidably engaged with the mounting base, and the slider is threadedly engaged with the screw. The nut rotating assembly is connected to the slider. The second motor can drive the screw to rotate. The screw rotation can achieve linear motion due to the structural action of the threaded engagement, thereby driving the nut rotating assembly mounted thereon to move linearly. The screw and the slider are connected by a threaded engagement, and the screw-on member of the nut is also threaded. In this way, when the nut rotating assembly is driven to move in the first direction, the nut can be effectively screwed onto the screw-on member by driving it at the same speed, making the screwing more rapid and accurate.

[0013] In a possible implementation, the system further includes a controller, a first proximity switch, and a second proximity switch, wherein the first proximity switch is set at a first test detection position in the first direction, and the second proximity switch is set at a second test detection position in the first direction, and the first proximity switch, the second proximity switch, the second motor, and the torque detection component are simultaneously connected to the controller. The first and second proximity switches can be used to facilitate detection of whether the nut on the nut rotation assembly has been rotated to the first and second test detection positions of the screw-on member, thereby controlling the forward and reverse rotation of the nut to achieve multiple reciprocating screwing actions.

[0014] In a possible implementation, a chip blowing assembly is further included. The chip blowing assembly includes an air pump and an air outlet pipe. The air outlet of the air pump is connected to the air outlet pipe, and the nozzle of the air outlet pipe is directed toward the screw-on component. The chip blowing assembly can remove iron chips generated during the screwing process, facilitating repeated screwing and improving test accuracy.

[0015] In a possible implementation, a control box is further included, having a supporting portion extending integrally to one side. The linear drive mechanism is mounted on the supporting portion, and the air pump, cooling fan, and power supply are installed within the control box. The supporting portion serves as a base for mounting the test mechanism, enhancing overall integrity and overall mobility. Furthermore, the control box's built-in power supply enhances portability and facilitates movement.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The nut fatigue testing device of the utility model can be applied to the fatigue life test of non-standard threads. It is convenient for the installation and disassembly of non-standard nuts and can also fix non-standard nuts of different sizes and shapes. It has a wider adaptability. In addition, the overall structure of the device is relatively simple, the cost is low, and it has good portability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional view of a nut fatigue testing device;

[0019] Figure 2 A perspective view of a nut rotating assembly of a nut fatigue testing device;

[0020] Figure 3 A cross-sectional view of a nut rotating assembly of a nut fatigue testing device;

[0021] Figure 4 A three-dimensional view of a linear drive mechanism of a nut rotating assembly of a nut fatigue testing device;

[0022] Figure 5 A three-dimensional view of a screw-on fixing assembly of a nut fatigue testing device;

[0023] Figure 6 A top view of a nut fatigue testing device;

[0024] Figure 7 A three-dimensional view of a nut fatigue testing device in the rear direction;

[0025] Figure 8 Schematic diagram of the coaxiality calibration principle of a nut fatigue testing device.

[0026] In the figure: 1- linear drive mechanism; 11- second motor; 12- lead screw; 13- lead screw mounting plate; 14- slider; 15- mounting seat; 16- adjusting gasket; 2- nut rotating assembly; 21- first motor; 22- bottom plate; 23- motor fixing plate; 24- bearing support plate; 25- bearing; 26- first clamping member; 27- second clamping member; 28- transmission shaft; 3- gun head nut; 4- test gun head; 5- screw fixing assembly; 51- torque detection component; 52- fixing component; 6- air outlet duct; 7- box body; 8- control box; 81- cooling fan; 82- air pump; 84- power supply; 85- controller; 86- second proximity switch; 87- first proximity switch; 9- calibration axis. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0028] Please refer to Figure 1-7 As shown, an embodiment of the present application provides a nut fatigue testing device, including a linear drive mechanism 1, a nut rotating assembly 2 and a screw-on fixing assembly 5, wherein the nut rotating assembly 2 is driven by the linear drive mechanism 1 to perform linear reciprocating motion along a first direction, and the nut rotating assembly 2 includes a rotating drive component and a nut fixing assembly, and the nut fixing assembly is driven to rotate by the rotating drive component, and the screw-on fixing assembly 5 is arranged in the first direction.

[0029] The linear drive mechanism 1 can make the nut rotating assembly 2 connected thereto move along the first direction to perform feed motion before screwing. During screwing, the nut rotating assembly 2 can drive the nut fixing assembly to which the nut is fixed to rotate, so that the nut can be screwed onto components such as bolts through rotation, and torque data can be obtained through the torque detection component 51 during the reciprocating movement and screwing process of the linear drive mechanism 1, thereby realizing the test of thread fatigue life.

[0030] Please refer to Figure 2 and Figure 3 As shown, in an embodiment of the present application, the nut fixing assembly may include a first clamping member 26 and a second clamping member 27. The first clamping member 26 and the second clamping member 27 are detachably connected, and a clamping position for fixing the nut is formed therebetween.

[0031] The first clamping member 26 and the second clamping member 27 fix the target part by clamping. Compared with the fixing method of the sleeve, this fixing method has better compatibility and can facilitate the clamping and fixing of non-standard nuts of different sizes and shapes. In addition, the detachable connection between the first clamping member 26 and the second clamping member 27 facilitates disassembly and installation of the nut, making the operation faster. In a specific embodiment, the detachable connection can be that the first clamping member 26 and the second clamping member 27 are both connected by fasteners, or one end is hinged and the other end is connected by a lock, which also facilitates disassembly.

[0032] Combine Figure 6 As shown, the screw-on fixing assembly 5 includes a fixing component 52 and a torque detection component 51. The fixing component 52 is used to mount a screw-on component for nut connection. The fixing component 52 can fix the screw-on component, such as a bolt, in a first direction and coaxially with the nut. This allows the fixing component 52 to be screwed onto the screw-on component during nut feeding. The torque detection component 51, located at a corresponding portion of the fixing component 52, contacts the screwed nut to obtain torque data.

[0033] In the specific implementation process, the screw-on component can be a welding gun head, and correspondingly, the nut is a gun head nut 3; of course, it can also be other non-standard nuts and bolt components that need to be fatigue tested, and there is no limitation.

[0034] In one embodiment, the nut rotating assembly 2 further includes a transmission shaft 28 , which is driven to rotate by the rotary drive component, and the first clamping member 26 or the second clamping member 27 is fixedly connected to the transmission shaft 28 .

[0035] In this way, the first clamping member 26 and the second clamping member 27 can be connected to the nut rotating assembly 2 through the transmission shaft 28, thereby improving the reliability of the transmission structure. In addition, the first clamping member 26 or the second clamping member 27 can be fixedly connected to the transmission shaft 28, and the transmission shaft 28 can be used as a fixed basis, so that the structure is more stable and has better structural properties during rotation.

[0036] Preferably, the first clamping member 26 or the second clamping member 27 is integrally formed with the transmission shaft 28, so that the transmission shaft 28 and the unfixed clamping member can be replaced at the same time and can be used to fix non-standard nuts of different sizes and shapes.

[0037] In order to avoid the rotational connection member during the rotational connection process with the nut, the transmission shaft 28 is further provided with an axial cavity for the rotational connection member to extend into.

[0038] Furthermore, the nut rotation assembly 2 also includes a connecting seat, and the rotation driving component is arranged on the connecting seat connected to the linear drive mechanism 1, and the output shaft of the rotation driving component is detachably connected to the transmission shaft 28.

[0039] In this way, the rotary drive component can drive the connecting shaft to rotate, and connecting the rotary drive component to the connecting seat can provide stable support, and the transmission shaft 28 is detachably connected to the output end of the rotary drive component, which can facilitate the simultaneous replacement of the transmission shaft 28 and the first clamping member 26 and the second clamping member 27 to test the threads of non-standard nuts of different sizes or shapes.

[0040] Specifically, the rotary drive component is a first motor 21. The connecting base includes a base plate 22 and a motor fixing plate 23 and a bearing support plate 24 vertically fixed to the base plate 22. The motor fixing plate 23 and the bearing support plate 24 are respectively equipped with the rotary drive component and the bearing 25.

[0041] In order to make the rotation of the transmission shaft 28 more stable and have higher coaxiality, the transmission shaft 28 is rotatably connected to the connecting seat through the bearing 25. By using the connecting seat as a support and rotating with the bearing 25, the coaxiality and stability of the nut during rotation can be further improved.

[0042] Please continue to refer to Figure 2 and Figure 3 As shown, in a preferred embodiment of the first clamping member 26 and the second clamping member 27, the first clamping member 26 and the second clamping member 27 are both C-shaped structures and symmetrical to each other, and the two ends of the first clamping member 26 and the second clamping member are connected by fasteners.

[0043] The first clamping member 26 and the second clamping member 27 utilize a C-shaped clamping structure, allowing for the clamping of non-standard bolts with varying shapes, such as hexagonal, circular, or rectangular non-standard nuts. Due to the simultaneous clamping method, the clamping of non-standard bolts with varying sizes is also acceptable. The simultaneous use of fasteners such as bolts facilitates adjustment of the degree of compression and the securing of non-standard nuts of varying sizes, expanding its applicability and providing greater convenience.

[0044] Please refer to Figure 4 As shown, in an embodiment of the present application, the linear drive mechanism 1 may include a mounting seat 15, a second motor 11, a screw 12 and a slider 14, the second motor 11 is arranged on the mounting seat 15, and the output shaft of the second motor 11 is connected to the screw 12, the screw 12 passes through the slider 14 that is slidably fitted on the mounting seat 15, and the slider 14 is threadedly fitted with the screw 12; the nut rotation assembly 2 is connected to the slider 14.

[0045] The second motor 11 can drive the screw 12 to rotate. The rotation of the screw 12 can achieve linear motion due to the structure of the threaded engagement, thereby driving the nut rotation assembly 2 mounted thereon to move linearly. The screw 12 is connected to the slider 14 by a threaded engagement, and the screw-on member of the nut is also threaded. In this way, when the nut rotation assembly 2 is driven to move in the first direction, the nut can be effectively screwed onto the screw-on member by driving it at the same speed, making the screwing faster and more accurate. Specifically, the screw 12 is rotatably mounted on the screw mounting plate 13.

[0046] It can be understood that in order to effectively screw the nut onto the screw-on component at the same rotation speed, the feed speed of one pitch of the screw rod 12 of the linear drive mechanism 1 can be configured to be equal to the feed speed of the motor driving the nut to rotate one circle, so that it can be screwed on accurately.

[0047] In order to achieve repeated reciprocating rotation, in an embodiment of the present application, it may also include a controller 85, a first proximity switch 87 and a second proximity switch 86, the first proximity switch 87 is set at a first test detection position in the first direction, the second proximity switch 86 is set at a second test detection position in the first direction, and the first proximity switch 87, the second proximity switch 86, the second motor 11 and the torque detection component 51 are connected to the controller 85 at the same time.

[0048] The first proximity switch 87 and the second proximity switch 86 can be used to detect whether the nut on the nut rotating assembly 2 has been rotated to the first and second test detection positions of the screw-on member, thereby controlling the forward and reverse rotation of the nut to achieve multiple reciprocating screwing operations. Of course, the first and second proximity switches 87 and 86 can be other photoelectric switches, such as infrared sensors, and are not limited thereto.

[0049] In an embodiment of the present application, a chip blowing assembly may also be included, which includes an air pump 82 and an air outlet pipe 6. The air outlet end of the air pump 82 is connected to the air outlet pipe 6, and the nozzle of the air outlet pipe 6 faces the screw-on component.

[0050] The chip blowing assembly can remove the iron chips generated during the screwing process, which is more conducive to repeated screwing and improves the accuracy of the test.

[0051] During the specific implementation process, a control box 8 may also be included. The control box 8 has a load-bearing portion extending integrally to one side. The linear drive mechanism 1 is arranged on the load-bearing portion, and the air pump 82, cooling fan 81 and power supply 84 are installed in the control box 8. The load-bearing portion can be used as a base for installing the test mechanism, making the integrity stronger and able to be moved as a whole. In addition, the power supply 84 provided by the control box 8 can improve portability and make movement more convenient. The power supply 84 can be a battery, which provides power, and the cooling fan 81 is used to dissipate heat from the internal heat-generating components. The control box 8 has a box body 7.

[0052] The working principle of a nut fatigue testing device according to an embodiment of the present application is as follows:

[0053] First, the gun head nut 3 and the test gun head 4 are respectively installed on the nut fixing assembly and the fixing component 52, and then the first motor 21 and the second motor 11 are started by the controller 85 to run simultaneously and rotate forward. The movement speed of the first motor 21 and the second motor 11 satisfies the feed speed of the second motor 11 driving the screw rod 121 pitches and the feed speed of the second motor 11 driving the nut 1 circle. After the gun head nut 3 is screwed onto the test gun head 4, it continues to be screwed in and contacts the torque sensor and can detect the knob torque. When it is screwed in to the first test detection position and is detected by the first proximity switch 87, the first motor 21 and the second motor 11 stop rotating and reverse. When the welding gun nut rotates in the opposite direction to the second test detection position and is detected by the second proximity switch 86, the first motor 21 and the second motor 11 stop rotating and rotate forward, and then screw in to the first test detection position. Several reciprocating rotations are performed, thereby testing the fatigue life of the welding gun head nut 3.

[0054] Please refer to Figure 8 As shown, a coaxiality calibration method of a nut fatigue testing device according to an embodiment of the present application is as follows:

[0055] The first step is to fix the fixing component 52 on the mounting base 15 of the linear drive mechanism 1 and accurately locate it with a positioning pin as a reference;

[0056] Step 2: Pass the calibration shaft 9 through the motor fixing plate 23 and the bearing support plate 24 and fix it to the fixing component 52, thereby determining the position of the linear drive mechanism 1 and the nut rotating assembly 2;

[0057] Step 3: Add the adjusting shim 16 and tighten the corresponding fixing screws, then remove the calibration shaft 9.

[0058] The above are merely preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be construed as limiting the present invention. The scope of protection of the present invention shall be determined by the scope defined in the claims. Persons skilled in the art will appreciate that improvements and modifications may be made without departing from the spirit and scope of the present invention, and such improvements and modifications shall also be considered within the scope of protection of the present invention.

Claims

1. A nut fatigue testing device, characterized in that: The invention comprises a linear drive mechanism (1), a nut rotating assembly (2) and a screw-on fixing assembly (5), wherein the nut rotating assembly (2) is driven by the linear drive mechanism (1) to perform linear reciprocating motion along a first direction, the nut rotating assembly (2) comprises a rotary drive component and a nut fixing assembly, the nut fixing assembly is driven to rotate by the rotary drive component, and the screw-on fixing assembly (5) is arranged in the first direction; The nut fixing assembly comprises a first clamping member (26) and a second clamping member (27), wherein the first clamping member (26) and the second clamping member (27) are detachably connected and a clamping position for fixing the nut is formed therebetween; The screw-on fixing assembly (5) comprises a fixing component (52) and a torque detection component (51), wherein the fixing component (52) is used for installing a screw-on component for nut connection.

2. A nut fatigue testing device according to claim 1, characterized in that: The nut rotating assembly (2) further comprises a transmission shaft (28), the transmission shaft (28) being driven to rotate by the rotary drive component, and the first clamping member (26) or the second clamping member (27) being fixedly connected to the transmission shaft (28).

3. A nut fatigue testing device according to claim 2, characterized in that: The transmission shaft (28) is provided with a shaft cavity for the screw-on component to extend into.

4. A nut fatigue testing device according to claim 2, characterized in that: The nut rotating assembly (2) further comprises a connecting seat, a rotating drive component is arranged on the connecting seat connected to the linear drive mechanism (1), and an output shaft of the rotating drive component is detachably connected to the transmission shaft (28).

5. A nut fatigue testing device according to claim 4, characterized in that: The transmission shaft (28) is rotatably connected to the connecting seat via a bearing (25).

6. A nut fatigue testing device according to claim 1, characterized in that: The first clamping member (26) and the second clamping member (27) are both C-shaped structures and are symmetrical to each other. The first clamping member (26) and the second clamping member are connected at both ends by fasteners.

7. A nut fatigue testing device according to claim 1, characterized in that: The linear drive mechanism (1) comprises a mounting seat (15), a second motor (11), a screw (12) and a slider (14); the second motor (11) is arranged on the mounting seat (15), and the output shaft of the second motor (11) is connected to the screw (12); the screw (12) passes through the slider (14) which is slidably engaged on the mounting seat (15), and the slider (14) is threadedly engaged with the screw (12); the nut rotating assembly (2) is connected to the slider (14).

8. A nut fatigue testing device according to claim 7, characterized in that: The invention also includes a controller (85), a first proximity switch (87) and a second proximity switch (86), wherein the first proximity switch (87) is set at a first test detection position in the first direction, and the second proximity switch (86) is set at a second test detection position in the first direction, and the first proximity switch (87), the second proximity switch (86), the second motor (11) and the torque detection component (51) are connected to the controller (85) at the same time.

9. A nut fatigue testing device according to claim 1, characterized in that: It also includes a chip blowing assembly, which includes an air pump (82) and an air outlet pipe (6). The air outlet end of the air pump (82) is connected to the air outlet pipe (6), and the nozzle of the air outlet pipe (6) faces the screw-on component.

10. A nut fatigue testing device according to claim 9, characterized in that: The invention also includes a control box (8), which has a bearing portion integrally extending to one side, the linear drive mechanism (1) is arranged on the bearing portion, and the air pump (82), the cooling fan (81) and the power supply (84) are installed in the control box (8).

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