Ball screw loading fatigue test device

Abstract

The invention provides a ball screw loading fatigue test device which is characterized in that a driving motor in the device is connected with a ball screw through a coupling, and the ball screw is supported on a foundation through a first bearing seat and a second bearing seat; the sliding rail is arranged on the foundation, and the sliding block is arranged on the sliding rail and can freely and linearly slide along the sliding rail; the lead screw nut supporting seat is fixed on the sliding block; the fatigue load loading device is arranged on the sliding rail and can linearly move on the sliding rail; when a lead screw nut of the fatigue load loading device moves to the two ends of the limit stroke and touches the travel switches, the control system controls the driving motor 1 to automatically switch to rotate in the reverse direction, and the lead screw nut moves in the reverse linear direction. The required driving motor torque is small, the load loading device is simple and reliable in structure, the motor is automatically controlled to rotate forwards and backwards in the whole fatigue test process, and the device is simple in structure, light in weight, safe, reliable and suitable for the ball screw fatigue test.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of helicopter tilt actuation system test, in particular to a ball screw loading fatigue test device. BACKGROUND

[0002] The ball screw loading fatigue test device is a kind of device for loading axial fatigue load on the ball screw to verify the fatigue performance of the ball screw assembly and obtain the fatigue life of the ball screw.

[0003] The traditional ball screw test bench drives the screw rotation by a driving motor, the screw nut is fixed on the test tooling table, the tooling table makes linear reciprocating motion by driving the screw to rotate forward and reverse, a weight is added on the tooling table or a hydraulic loading cylinder capable of linear motion is designed to load fatigue load on the ball screw, the torque of the driving motor of the traditional ball screw test bench not only needs to overcome the fatigue load but also needs to overcome the friction of the ball screw and the rolling bearing, the requirement for the driving motor is high, the load loading mechanism is relatively complex, the whole fatigue test bench needs to be manually controlled or the motor needs to be controlled in time, and the risk of the screw nut moving beyond the limit stroke is high. SUMMARY

[0004] To solve the problems of the prior art, such as high requirement for the driving motor, complex load loading mechanism, high risk of the screw nut moving beyond the limit stroke, etc., the present application provides a ball screw loading fatigue test device, the required driving motor torque is small, the load loading device structure is simple and reliable, the whole fatigue test process is automatically controlled, the structure is simple to use, light in weight, safe and reliable, and suitable for ball screw fatigue test. In a first aspect, a ball screw loading fatigue test device is provided, comprising: a driving motor 1, a foundation 2, a first bearing seat 3, a ball screw 7, a second bearing seat 10, a shaft coupling 16, a slide rail, a sliding block, a fatigue load loading device, and a stroke switch, The driving motor 1 is connected with the ball screw 7 through the shaft coupling 16, the ball screw 7 is supported on the foundation 2 through the first bearing seat 3 and the second bearing seat 10, the slide rail is arranged on the foundation 2, the sliding block is arranged on the slide rail and can freely slide linearly along the slide rail, and the screw nut support seat is fixed on the sliding block, The fatigue load loading device is arranged on the slide rail and can move linearly on the slide rail, and the left and right limit strokes of the screw are provided with stroke switches, when the screw nut of the fatigue load loading device moves to the limit stroke, collides with the stroke switch, and the control system controls the driving motor 1 to automatically switch to reverse rotation, the screw nut moves linearly in reverse.

[0005] Optionally, the slide rail comprises a first slide rail 4 and a second slide rail 13, the first slide rail 4 and the second slide rail 13 are arranged on the foundation 2, and the fatigue load loading device is arranged on the first slide rail 4 and the second slide rail 13.

[0006] Optionally, the travel switch comprises a right travel switch 11 and a left travel switch 15, the right travel switch 11 and the left travel switch 15 are arranged at the left and right limit positions of the screw rod respectively.

[0007] Optionally, the sliding block comprises a first sliding block 5, a second sliding block 8, a third sliding block 12 and a fourth sliding block 14, the first sliding block 5 and the second sliding block 8 are arranged on the first slide rail 4, and the third sliding block 12 and the fourth sliding block 14 are arranged on the second slide rail 13. The first screw nut support seat 6 is fixed on the first sliding block 5 and the fourth sliding block 14, and the second screw nut support seat 9 is fixed on the second sliding block 8 and the third sliding block 12.

[0008] Optionally, the fatigue load loading device comprises a first screw nut 17, a first loading nut 18, a first loading screw 19, a second screw nut 21, a first locking nut 22, a second locking nut 23, a second loading screw 25 and a second loading nut 26. The first screw nut 17 is arranged on the first screw nut support seat 6, the second screw nut 21 is arranged on the second screw nut support seat 9, and the first screw nut 17 and the second screw nut 21 are arranged back to back on the ball screw 7, the first loading screw 19 and the second loading screw 25 are arranged between the first screw nut support seat 6 and the second screw nut support seat 9, and the first loading nut 18 and the second loading nut 26 are rotated to load the screw nut with an axial load, when the first loading screw 19 and the second loading screw 25 load differently, the two back-to-back screw nuts are loaded with an axial load and a torque load. The first loading nut 18 is located on the left side of the first loading screw 19, the second loading nut 26 is located on the left side of the second loading screw 25, and is pressed on the first screw nut support seat 6 through thread connection; The first locking nut 22 is arranged at the right end of the first loading screw 19, and the second locking nut 23 is arranged at the right end of the second loading screw 25, for fixing the loading screw and the pressure sensor on the second screw nut support seat 9, while not affecting the loading load of the screw nut.

[0009] Further, the fatigue load loading device further comprises: a first pressure sensor 20, a second pressure sensor 24, The first pressure sensor 20 is pressed on the second screw nut support seat 9 by the boss of the first loading screw 19, and the second pressure sensor 24 is pressed on the second screw nut support seat 9 by the boss of the second loading screw 25, for measuring the axial load of the loading.

[0010] Optionally, the first screw nut 17 and the second screw nut 21 of the fatigue load loading device are arranged on the first slide rail 4 and the second slide rail 13 and cannot rotate.

[0011] Optionally, the first loading screw rod 19 and the second loading screw rod 25 are arranged in a regular hexagon, a square or a flat key at one end, and the inner hole of the first screw nut support seat 6 is also arranged in a regular hexagon, a square or a flat key to prevent rotation.

[0012] The present application has at least the following beneficial effects: The driving motor 1 directly drives the ball screw 7 to rotate, and the two back-to-back screw nuts move linearly on the slide rail. The fatigue load loading device loads the axial load on the screw nut. The driving torque of the driving motor 1 only needs to overcome the friction of the ball screw 7 and the friction of the slide rail, and has nothing to do with the fatigue load, thereby reducing the torque of the driving motor 1. The right limit switch 11 and the left limit switch 15 are arranged at the left and right limit positions of the screw, respectively. The driving motor 1 is automatically switched to reverse rotation by the control system, the screw nut moves linearly in the opposite direction, and the fatigue test can automatically run down without manual intervention. The first screw nut 17 and the second screw nut 21 are arranged back-to-back on the ball screw 7, and the axial load and torque load are loaded on the screw nut by rotating the first loading nut 18 and the second loading nut 26. The axial load is measured by the pressure sensor. The ball screw fatigue test loading device has a compact and practical structure. The present application is suitable for ball screw loading test. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a schematic diagram of the ball screw loading fatigue test device of the present application; Figure 2 It is a schematic diagram of the fatigue load loading device of the present application; Figure 3 It is a schematic diagram of the loading screw rod of the present application.

[0014] Among them, 1-driving motor; 2-foundation; 3-first bearing seat; 4-first slide rail; 5-first sliding block; 6-first screw nut support seat; 7-ball screw; 8-second sliding block; 9-second screw nut support seat; 10-second bearing seat; 11-right limit switch; 12-third sliding block; 13-second slide rail; 14-fourth sliding block; 15-left limit switch; 16-coupling; 17-first screw nut; 18-first loading nut; 19-first loading screw rod; 20-first pressure sensor; 21-second screw nut; 22-first locking nut; 23-second locking nut; 24-second pressure sensor; 25-second loading screw rod; 26-second loading nut. DETAILED DESCRIPTION

[0015] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, any other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0016] The features and illustrative embodiments of various aspects of the present application will be described below in detail. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without some of these specific details. The description of the embodiments is merely to provide a better understanding of the present application by showing examples of the present application. The present application is in no way limited to any specific settings and methods presented below, but covers any improvements, replacements and modifications of structures, methods and devices without departing from the spirit of the present application. In the drawings and the following description, well-known structures and techniques are not shown to avoid unnecessary obscuring of the present application.

[0017] It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict, and each embodiment can be referred to and cited by each other.

[0018] The present application will be described in detail below with reference to the drawings and specific embodiments.

[0019] Referring to Figure 1 The present application provides a ball screw loading fatigue test device, which comprises a driving motor 1, a foundation 2, a first bearing seat 3, a first sliding rail 4, a first sliding block 5, a first screw nut support seat 6, a ball screw 7, a second sliding block 8, a second screw nut support seat 9, a second bearing seat 10, a right travel switch 11, a third sliding block 12, a second sliding rail 13, a fourth sliding block 14, a left travel switch 15, a shaft coupling 16 and a fatigue load loading device. The driving motor 1 is connected with the ball screw 7 through the coupling 16, the ball screw 7 is supported on the foundation 2 through the first bearing seat 3 and the second bearing seat 10; the first slide rail 4 and the second slide rail 13 are installed on the foundation 2, the sliding block can freely linearly slide on the slide rail; the fatigue load loading device is arranged on the first slide rail 4 and the second slide rail 13 and can linearly move on the slide rail; the right and left limit travel switches 11 and 15 are respectively arranged at the two ends of the left and right limit travel of the screw, when the screw nut moves to the limit travel position at the two ends, collides with the travel switch, the control system controls the driving motor 1 to automatically switch to reverse rotation, the screw nut linearly moves in the reverse direction, and the fatigue test can automatically run down without manual intervention.

[0020] The fatigue load loading device is composed of the first screw nut 17, the first loading nut 18, the first loading screw 19, the first pressure sensor 20, the second screw nut 21, the first locking nut 22, the second locking nut 23, the second pressure sensor 24, the second loading screw 25 and the second loading nut 26, as shown in Figure 2 The first screw nut 17 and the second screw nut 21 are back-to-back installed on the ball screw 7, the first loading screw 19 and the second loading screw 25 are arranged between the first screw nut support seat 6 and the second screw nut support seat 9, the screw nut is loaded with an axial load by rotating the first loading nut 18 and the second loading nut 26, when the first loading screw 19 and the second loading screw 25 load differently, the two back-to-back screw nuts are loaded with an axial load and a torque load; wherein one end of the first loading screw 19 and the second loading screw 25 is arranged into a regular hexagon, a regular quadrilateral or a flat key, and the inner hole of the first screw nut support seat 6 is also arranged into a regular hexagon, a regular quadrilateral or a flat key, so as to prevent rotation, as shown in Figure 3 The first loading nut 18 is located at the left side of the first loading screw 19, the second loading nut 26 is located at the left side of the second loading screw 25, and is pressed on the first screw nut support seat 6 through threaded connection; the first pressure sensor 20 is pressed on the second screw nut support seat 9 by the boss of the first loading screw 19, and the second pressure sensor 24 is pressed on the second screw nut support seat 9 by the boss of the second loading screw 25, for measuring the axial load; the first locking nut 22 is arranged at the right end of the first loading screw 19, and the second locking nut 23 is arranged at the right end of the second loading screw 25, for fixing the loading screw and the pressure sensor on the second screw nut support seat 9, while not affecting the loading load of the screw nut.

[0021] The first screw nut 17 and the second screw nut 21 of the fatigue load loading device are arranged to slide on the first sliding rail 4 and the second sliding rail 13 but cannot rotate; the first screw nut 17 is installed on the first screw nut support seat 6 through a screw, the second screw nut 21 is installed on the second screw nut support seat 9 through a screw, the first screw nut support seat 6 is fixed on the first sliding block 5 and the fourth sliding block 14 through bolts, and the second screw nut support seat 9 is fixed on the second sliding block 8 and the third sliding block 12 through bolts.

[0022] In another embodiment, referring to Figure 1 and Figure 2 , the ball screw fatigue test loading device comprises a driving motor 1, a foundation 2, a first bearing seat 3, a first sliding rail 4, a first sliding block 5, a first screw nut support seat 6, a ball screw 7, a second sliding block 8, a second screw nut support seat 9, a second bearing seat 10, a right travel switch 11, a third sliding block 12, a second sliding rail 13, a fourth sliding block 14, a left travel switch 15, a shaft coupling 16, a first screw nut 17, a first loading nut 18, a first loading screw 19, a first pressure sensor 20, a second screw nut 21, a first locking nut 22, a second locking nut 23, a second pressure sensor 24, a second loading screw 25 and a second loading nut 26.

[0023] The driving motor 1 directly drives the ball screw 7 to rotate, the two back-to-back screw nuts move linearly on the sliding rails, the fatigue load loading device is arranged between the two back-to-back screw nuts, axial loads are applied to the screw nuts, and the driving torque of the driving motor 1 only needs to overcome the friction of the ball screw 7 and the friction of the sliding rails, and is irrelevant to the fatigue load, so that the torque of the driving motor 1 is reduced.

[0024] In the device, the driving motor 1 directly drives the ball screw 7 to rotate, the two back-to-back screw nuts move linearly on the sliding rails, the fatigue load loading device applies axial loads to the screw nuts, the driving torque of the driving motor 1 only needs to overcome the friction of the ball screw 7 and the friction of the sliding rails, and is irrelevant to the fatigue load, so that the torque of the driving motor 1 is reduced. The right travel switch 11 and the left travel switch 15 are arranged at the left and right limit positions of the ball screw respectively, the driving motor 1 is automatically switched to rotate in the reverse direction through a control system, the screw nuts move linearly in the reverse direction, the fatigue test can automatically run down without manual intervention, the first screw nut 17 and the second screw nut 21 are arranged back to back on the ball screw 7, axial loads and torque loads are applied to the screw nuts by rotating the first loading nut 18 and the second loading nut 26, and the axial loads are measured through the pressure sensors. The ball screw fatigue test loading device is compact, practical and simple in structure, and can be used for ball screw loading test.

[0025] The key points of the present application are as follows: 1) The driving motor 1 is designed to directly drive the lead screw, and the rotating speed of the driving motor 1 is adjustable; 2) Two support seats are respectively used to support two lead screw nuts, and the bottom of each support seat is provided with a sliding rail, when the driving motor 1 drives the lead screw, the two back-to-back lead screw nuts move linearly on the sliding rail; 3) Two limit position travel switches are respectively designed at the left and right stroke ends of the lead screw, when the lead screw nut moves to the limit position at the two ends and hits the travel switch, the control system controls the driving motor 1 to automatically switch to reverse rotation, and the lead screw nut moves reversely, so that the test can automatically run down; 4) The loading nuts and screw rods on the left and right sides form a loading mechanism, which respectively loads the two lead screw nuts with axial loads in opposite directions; 5) The pressure sensor is pressed on the lead screw nut support seat by the boss of the loading screw rod, and is used to measure the loaded axial load; 6) One end of the first loading screw rod 19 and the second loading screw rod 25 is provided with a regular hexagon, a regular quadrilateral or a flat key, and the first lead screw nut is supported.

[0026] The above only expresses the embodiments of the present application, and the description is relatively specific and detailed, but it cannot be understood as the limitation of the patent scope. It should be noted that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. In addition, the non-exhaustive parts of the present application are all conventional technologies.

Claims

1. A ball screw loading fatigue testing device, characterized in that, include: Drive motor (1), foundation (2), first bearing housing (3), ball screw (7), second bearing housing (10), coupling (16), slide rail, slider, fatigue load loading device, limit switch, The drive motor (1) is connected to the ball screw (7) via a coupling (16). The ball screw (7) is supported on the foundation (2) via a first bearing seat (3) and a second bearing seat (10). The slide rail is set on the foundation (2), and the slider is set on the slide rail and can slide freely in a straight line along the slide rail. The screw nut support seat is fixed on the slider. The fatigue load loading device is set on the slide rail and can move linearly on the slide rail; limit switches are set at both ends of the left and right limit strokes of the lead screw. When the lead screw nut of the fatigue load loading device moves to the two ends of the limit stroke and hits the limit switch, the control system controls the drive motor 1 to automatically switch to the reverse direction of rotation, and the lead screw nut moves linearly in the opposite direction.

2. The apparatus according to claim 1, characterized in that, The slide rail includes a first slide rail (4) and a second slide rail (13), which are set on the foundation (2). The fatigue load loading device is set on the first slide rail (4) and the second slide rail (13).

3. The apparatus according to claim 2, characterized in that, The limit switches include a right limit switch (11) and a left limit switch (15). The right limit switch (11) and the left limit switch (15) are respectively set at the left and right limit travel ends of the lead screw.

4. The apparatus according to claim 3, characterized in that, The slider includes a first slider (5), a second slider (8), a third slider (12), and a fourth slider (14). The first slider (5) and the second slider (8) are located on the first slide rail (4), and the third slider (12) and the fourth slider (14) are located on the second slide rail (13). The first lead screw nut support (6) is fixed on the first slider (5) and the fourth slider (14), and the second lead screw nut support (9) is fixed on the second slider (8) and the third slider (12).

5. The apparatus according to claim 4, characterized in that, The fatigue load loading device comprises a first lead screw nut (17), a first loading nut (18), a first loading screw (19), a second lead screw nut (21), a first locking nut (22), a second locking nut (23), a second loading screw (25), and a second loading nut (26). The first lead screw nut (17) is set on the first lead screw nut support seat (6), and the second lead screw nut (21) is set on the second lead screw nut support seat (9). The first lead screw nut (17) and the second lead screw nut (21) are set back to back on the ball screw (7). The first loading screw (19) and the second loading screw (25) are set between the first lead screw nut support seat (6) and the second lead screw nut support seat (9). Rotating the first loading nut (18) and the second loading nut (26) applies an axial load to the lead screw nut. When the loads of the first loading screw (19) and the second loading screw (25) are different, the two back-to-back lead screw nuts are loaded with an axial load and a torque load. The first loading nut (18) is located to the left of the first loading screw (19), and the second loading nut (26) is located to the left of the second loading screw (25), and is pressed on the first screw nut support seat (6) by a threaded connection; The first locking nut (22) is located at the right end of the first loading screw (19), and the second locking nut (23) is located at the right end of the second loading screw (25). It is used to fix the loading screw and the pressure sensor on the second screw nut support (9) without affecting the loading load of the screw nut.

6. The apparatus according to claim 5, characterized in that, The fatigue load loading device also includes: a first pressure sensor (20) and a second pressure sensor (24). The first pressure sensor (20) is pressed onto the second lead screw nut support seat (9) by the boss of the first loading screw (19), and the second pressure sensor (24) is pressed onto the second lead screw nut support seat (9) by the boss of the second loading screw (25), for measuring the axial load.

7. The apparatus according to claim 5, characterized in that, The first lead screw nut (17) and the second lead screw nut (21) of the fatigue load loading device are set on the first slide rail (4) and the second slide rail (13) and cannot rotate.

8. The apparatus according to claim 3, characterized in that, One end of the first loading screw (19) and the second loading screw (25) is set to a regular hexagon, a regular square or a flat key, and the inner hole of the first screw nut support seat (6) is also set to a regular hexagon, a regular square or a flat key.

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