A rotary impact testing device and method

Abstract

The application belongs to the technical field of strength test, and particularly relates to a rotary impact test device and method. The device comprises a variable frequency motor, a clutch, a slip ring, a brake, an inner wheel, a tested piece, a fixed wedge shaft, a rotating wedge shaft, a torque speed instrument, an inertia disc and a test platform. The rotary impact test device and method are based on a rotary impact test mode of "first clutching, then braking and passive mechanical collision", and the main principle is that the tested piece, the inertia disc, a collision mechanical mechanism and the like are first rotated together, then separated from a power source after reaching a specified rotating speed and continuously rotated by inertia, then the brake is started to stop the rotation of the tested piece, and at this moment, the rotating wedge shaft is continuously rotated by 108 degrees by the inertia disc and collides with the fixed wedge shaft and transmits kinetic energy to the tested piece. The rotary impact test mode is more reliable and easy to realize, and is suitable for high rotating speed and low rotating speed conditions.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of strength test, and particularly relates to a rotating impact test device and method. BACKGROUND

[0002] Impact test is generally a test method for determining the safety, reliability and effectiveness of a product when the product is subjected to external force impact or action. The conventional impact test method is generally a drop hammer, pendulum or horizontal acceleration test method, and the impact test is performed in a straight line or tangent direction. These impact test methods can only be applied to straight line collision and cannot be applied to collision process research of high-speed rotating elements.

[0003] Therefore, it is desirable to have a technical solution to overcome or at least alleviate at least one of the aforementioned deficiencies of the prior art. SUMMARY

[0004] The application aims to provide a rotating impact test device and method to solve at least one problem existing in the prior art.

[0005] The technical solution of the application is as follows:

[0006] The first aspect of the application provides a rotating impact test device, comprising:

[0007] A variable frequency motor is installed on a test platform;

[0008] A clutch is installed on the test platform, a front end of the clutch is connected with the variable frequency motor, and a rear end of the clutch is provided with a slip ring;

[0009] A test piece is connected with the slip ring at a front end thereof;

[0010] An inner wheel is sleeved on an outer side of the test piece, and an inner ring of the inner wheel is connected with an outer ring of the test piece through a key;

[0011] A brake is installed on the test platform and sleeved on an outer side of the inner wheel;

[0012] A fixed wedge shaft is connected with the inner ring of the test piece through a key at a front end thereof, and two impact surfaces are arranged at a rear end of the fixed wedge shaft;

[0013] A rotating wedge shaft is connected with the rear end of the fixed wedge shaft through a bearing at a front end thereof, the front end of the rotating wedge shaft is provided with two impact surfaces matched with the impact surfaces of the fixed wedge shaft, and the impact surfaces of the rotating wedge shaft can collide with the impact surfaces of the fixed wedge shaft after the rotating wedge shaft rotates 108° relative to the fixed wedge shaft;

[0014] An inertia disc is installed on the test platform, and a torque speed sensor is arranged between the inertia disc and the rear end of the rotating wedge shaft.

[0015] In at least one embodiment of the present application, the variable frequency motor is installed on the test platform through a first support frame.

[0016] In at least one embodiment of the present application, the clutch and the slip ring are installed on the test platform through a second support frame.

[0017] In at least one embodiment of the present application, the brake is a drum brake.

[0018] In at least one embodiment of the present application, the brake is installed on the test platform through a third support frame, wherein,

[0019] The third support frame includes a rectangular support seat and a support base, the rectangular support seat includes a front support plate and a rear support plate, and the support base is fixed on the test platform by bolts;

[0020] The brake is provided with a front mounting edge and a rear mounting edge, the front mounting edge is connected with the front support plate flange, and the rear mounting edge is connected with the rear support plate flange.

[0021] In at least one embodiment of the present application,

[0022] The rear end of the fixed wedge shaft is provided with four bosses, which are sequentially first boss, second boss, third boss and fourth boss in clockwise direction, the plane opposite to the first boss and the second boss is a1 plane, the plane opposite to the second boss and the first boss is b1 plane, the plane opposite to the third boss and the fourth boss is a2 plane, and the plane opposite to the fourth boss and the third boss is b2 plane, wherein, the a1 plane and the a2 plane are in the same plane, and together form an impact surface A;

[0023] The b1 plane and the b2 plane are in the same plane, and together form an impact surface B, the impact surface B and the impact surface A have an included angle of 108°.

[0024] In at least one embodiment of the present application, the torque speed sensor and the inertia disc are installed on the test platform through a fourth support frame.

[0025] The second aspect of the present application provides a rotary impact test method based on the rotary impact test device as described above, comprising:

[0026] The rotating speed and direction of the variable frequency motor are set, and other rotating parts are driven to rotate together by the variable frequency motor;

[0027] When reaching the set speed and stabilizing, the clutch is disconnected and the frequency conversion motor is connected, and after confirming the disconnection of the clutch, the brake is started;

[0028] When the brake is started, the inner wheel, the tested piece and the fixed wedge shaft stop rotating together;

[0029] The inertia disc drives the rotating wedge shaft to continue rotating by inertia, and when rotating 108°, the rotating wedge shaft collides with the fixed wedge shaft at the impact surface and transmits kinetic energy to the tested piece, and the strain, rotating speed and torque data of the tested piece are collected by the torque speed instrument for impact process analysis;

[0030] After completing the collision, the brake is released after the frequency conversion motor stops rotating.

[0031] The application has at least the following beneficial technical effects:

[0032] The rotating impact test device of the application adopts the rotating impact test mode of "first clutching, then braking and passive mechanical collision", can realize parameter measurement and adjustment of impact rotating speed and inertia in the mechanical collision process of high-speed rotating elements, and can truly and effectively realize impact strength and impact dynamic characteristic test of high-speed rotating elements. BRIEF DESCRIPTION OF DRAWINGS

[0033] Fig. 1 is a whole schematic view of the rotating impact test device of one embodiment of the application;

[0034] Fig. 2 is a schematic view of the assembly position of the tested piece of one embodiment of the application;

[0035] Fig. 3 is a schematic view of the impact surface of the fixed wedge shaft and the rotating wedge shaft of one embodiment of the application.

[0036] Among them:

[0037] 1-frequency conversion motor; 2-clutch; 3-slip ring; 4-brake; 5-inner wheel; 6-tested piece; 7-fixed wedge shaft; 8-rotating wedge shaft; 9-torque speed instrument; 10-inertia disc; 11-test platform. DETAILED DESCRIPTION

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0039] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this application.

[0040] The following is in conjunction with the appendix Figs. 1 to 3 This application will be described in further detail.

[0041] The first aspect of this application provides a rotating impact testing apparatus, including a variable frequency motor 1, a clutch 2, a slip ring 3, a brake 4, an inner wheel 5, a test piece 6, a fixed wedge shaft 7, a rotating wedge shaft 8, a torque tachometer 9, an inertia disk 10, and a test platform 11.

[0042] like Fig. 1 As shown, the variable frequency motor 1 is installed on the test platform 11 and is used to provide power; the clutch 2 is installed on the test platform 11, the front end of the clutch 2 is connected to the variable frequency motor 1, and the rear end of the clutch 2 is equipped with a slip ring 3. The clutch 2 can disconnect the output shaft of the variable frequency motor 1 from other rotating parts in the test device after the variable frequency motor 1 reaches the set speed, so that all rotating parts after the clutch 2 can continue to rotate by inertia.

[0043] The front end of the tested piece 6 is connected with the slip ring 3, the inner wheel 5 is sleeved outside the tested piece 6, and the inner ring of the inner wheel 5 is connected with the outer ring of the tested piece 6 through a key, the brake 4 is installed on the test platform 11, and the brake 4 is sleeved outside the outer ring of the inner wheel 5. The slip ring 3 is used for connecting the strain wire of the tested piece 6, the wire end rotating with the tested piece 6 is converted into a fixed end connected with a measuring device, and an electric signal of strain measurement is transmitted; the inner ring of the inner wheel 5 is connected with the tested piece 6, the inner wheel 5 and the tested piece 6 remain relatively stationary during rotation, the outer ring of the inner wheel 5 cooperates with the brake 4 to realize friction braking; the brake 4 clamps the inner wheel 5 to realize the function of rapid braking.

[0044] The front end of the fixed wedge shaft 7 is connected with the inner ring of the tested piece 6 through a key, and the key connection is used in the embodiment, the two are relatively fixed and rotate synchronously; the rear end of the fixed wedge shaft 7 is provided with two impact surfaces; the front end of the rotating wedge shaft 8 is connected with the rear end of the fixed wedge shaft 7 through a bearing and can rotate relatively in the rotating direction, the front end of the rotating wedge shaft 8 is provided with two impact surfaces matched with the fixed wedge shaft 7, and when the rotating wedge shaft 8 rotates 108° relative to the fixed wedge shaft 7, the impact surface of the rotating wedge shaft 8 can collide with the impact surface of the fixed wedge shaft 7.

[0045] Further, the inertia disc 10 is installed on the test platform 11, the inertia disc 10 is connected with the rear end of the rotating wedge shaft 8, and the torque speed instrument 9 is arranged between the inertia disc 10 and the rotating wedge shaft 8. The torque speed instrument 9 can feed back the rotating speed and the torque in real time, and after cooperation with a collection system, the torque and rotating speed data of the tested piece 6 in the collision process can be recorded; the inertia disc 10 is designed according to the test requirement, and after the rotating speed reaches a specified value, the inertia disc 10 can drive the rotating wedge shaft 8 to rotate by inertia after the clutch 2 and the brake 4 are started, and collide with the fixed wedge shaft 7, which is the main source of impact kinetic energy.

[0046] In the preferred embodiment of the application, the variable frequency motor 1 is installed on the test platform 11 through a first support frame, the clutch 2 and the slip ring 3 are installed on the test platform 11 through a second support frame, the brake 4 is installed on the test platform 11 through a third support frame, the torque speed instrument 9 and the inertia disc 10 are installed on the test platform 11 through a fourth support frame, and the test platform 11 is used to stably support the test equipment and is connected with the ground to provide sufficient system stiffness. Each support frame adopts a proper assembly structure to stably install the corresponding component. In the embodiment, the brake 4 is a drum brake, the third support frame includes a rectangular support seat and a support base, the rectangular support seat includes a front support plate and a rear support plate, a through hole for installing the tested piece 6 and its assembly structure is arranged in the center of the rectangular support seat, and the support base is fixed on the test platform 11 through bolts; the brake 4 is provided with a front mounting edge and a rear mounting edge, the front mounting edge is flange-connected with the front support plate, and the rear mounting edge is flange-connected with the rear support plate.

[0047] In the preferred embodiment of the present application, as shown in Fig. 3 The rear end of the fixed wedge shaft 7 is provided with four bosses, in clockwise order, a first boss, a second boss, a third boss, and a fourth boss. The plane opposite the first boss and the second boss is the a1 plane, the plane opposite the second boss and the first boss is the b1 plane, the plane opposite the third boss and the fourth boss is the a2 plane, and the plane opposite the fourth boss and the third boss is the b2 plane. The a1 plane and the a2 plane are in the same plane and together form the impact surface A. The b1 plane and the b2 plane are in the same plane and together form the impact surface B. The impact surface B and the impact surface A have an included angle of 108°. The front end of the rotating wedge shaft 8 is provided with two impact surfaces. In this embodiment, the fixed wedge shaft 7 and the rotating wedge shaft 8 share four impact surfaces. The a1 plane and the a2 plane are in the same impact surface A and are in the inner ring of the wedge shaft. The b1 plane and the b2 plane are in the same impact surface B and are in the outer ring of the wedge shaft. The impact surface A and the impact surface B have an included angle of 108°, so when the fixed wedge shaft 7 and the rotating wedge shaft 8 rotate relative to each other, they will collide at the impact surface A or the impact surface B after rotating 108°.

[0048] Based on the above-mentioned rotary impact test device, the second aspect of the present application provides a rotary impact test method, comprising the following steps:

[0049] a. Set the speed and direction of the variable frequency motor 1, and drive the other rotating parts to rotate together by the variable frequency motor 1;

[0050] b. When the set speed is reached and stabilized, start the clutch 2 to disconnect the variable frequency motor 1, and determine that the clutch 2 is disconnected, then start the brake 4;

[0051] c. When the brake 4 is started, the inner ring 5, the test piece 6, and the fixed wedge shaft 7 stop rotating together;

[0052] d. The inertia disc 10 drives the rotating wedge shaft 8 to continue rotating by inertia. When the rotating wedge shaft 8 rotates 108°, it collides with the fixed wedge shaft 7 at the impact surface A or the impact surface B (determined by the direction of rotation), and transmits kinetic energy to the test piece 6. The strain, speed, and torque data of the test piece 6 are collected by the torque speed instrument 9 for impact process analysis;

[0053] e. After the collision is completed, the brake 4 is released after the variable frequency motor 1 stops rotating.

[0054] The rotating impact test device and method of the application is based on the rotating impact test mode of "first clutching, then braking, passive mechanical collision", and the main principle is: first, make the tested piece 6, the inertia disc 10, the collision mechanical mechanism and the like rotate together, and after reaching the specified rotating speed, separate from the power source, and continue to rotate by inertia; then, start the brake 4 to make the tested piece 6 stop rotating; at this time, the rotating wedge shaft 8 continues to rotate 108° with the inertia disc 10, collides with the fixed wedge shaft 7, and transmits kinetic energy to the tested piece 6. This rotating impact test mode is more reliable and easy to realize, and is suitable for high rotating speed and low rotating speed conditions. The application can make the tested piece produce mechanical impact in the high-speed rotating direction, and can realize parameter measurement in the impact process, impact speed and inertia adjustment, so as to realize the impact strength and impact dynamic characteristic test of the high-speed rotating element.

[0055] The above is only a specific embodiment of the application, but the protection scope of the application is not limited to this, any skilled person in the art can easily think of changes or replacements within the technical range disclosed in the application, which should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A rotary impact testing device, characterized by, The utility model relates to a rotating impact test device, which comprises the following parts: a variable frequency motor (1) is installed on a test platform (11); a clutch (2) is installed on the test platform (11), the front end of the clutch (2) is connected with the variable frequency motor (1), and the rear end of the clutch (2) is provided with a slip ring (3); a tested piece (6) is connected with the slip ring (3) at the front end; an inner wheel (5) is sleeved on the outer side of the tested piece (6), and the inner ring of the inner wheel (5) is connected with the outer ring of the tested piece (6) through a key; a brake (4) is installed on the test platform (11), and the brake (4) is sleeved on the outer side of the inner wheel (5); a fixed wedge shaft (7) is connected with the inner ring of the tested piece (6) through a key at the front end, and the rear end of the fixed wedge shaft (7) is provided with two impact surfaces; a rotating wedge shaft (8) is connected with the rear end of the fixed wedge shaft (7) through a bearing at the front end, the front end of the rotating wedge shaft (8) is provided with two impact surfaces matched with the fixed wedge shaft (7), and when the rotating wedge shaft (8) rotates 108 degrees relative to the fixed wedge shaft (7), the impact surfaces of the rotating wedge shaft (8) can collide with the impact surfaces of the fixed wedge shaft (7); an inertia disc (10) is installed on the test platform (11), the inertia disc (10) is connected with the rear end of the rotating wedge shaft (8), and a torque speed instrument (9) is arranged between the inertia disc (10) and the rotating wedge shaft (8).

2. The rotary impact testing device of claim 1, wherein, The variable frequency motor (1) is installed on the test platform (11) through a first support frame.

3. The rotary impact testing device of claim 1, wherein, The clutch (2) and the slip ring (3) are installed on the test platform (11) through a second support frame.

4. The rotary impact testing device of claim 1, wherein, The brake (4) is a drum brake.

5. The rotary impact testing device of claim 4, wherein, The brake (4) is installed on the test platform (11) through a third support frame, wherein the third support frame comprises a rectangular support seat and a support base, the rectangular support seat comprises a front support plate and a rear support plate, and the support base is fixed on the test platform (11) through bolts; the brake (4) is provided with a front mounting edge and a rear mounting edge, the front mounting edge is connected with the front support plate flange, and the rear mounting edge is connected with the rear support plate flange.

6. The rotating impact test device according to claim 1, wherein the rear end of the fixed wedge shaft (7) is provided with four bosses, which are a first boss, a second boss, a third boss and a fourth boss in sequence in a clockwise direction, the opposite plane of the first boss and the second boss is an a1 plane, the opposite plane of the second boss and the first boss is a b1 plane, the opposite plane of the third boss and the fourth boss is an a2 plane, and the opposite plane of the fourth boss and the third boss is a b2 plane, wherein the a1 plane and the a2 plane are in the same plane and form an impact surface A together. The b1 plane and the b2 plane are in the same plane and jointly form an impact surface B, which has an included angle of 108° with the impact surface A.

7. The rotary impact testing device of claim 1, wherein, The torque speed meter (9) and the inertia disc (10) are installed on the test platform (11) through a fourth support frame.

8. A rotary impact test method based on the rotary impact test device according to any one of claims 1 to 7, characterized by, Comprise: Set the speed and direction of the variable frequency motor (1), and drive other rotating parts to rotate together through the variable frequency motor (1); When the set speed is reached and stabilized, start the clutch (2) to disconnect the variable frequency motor (1), and determine that the clutch (2) is disconnected, and then start the brake (4); When the brake (4) is started, the inner wheel (5), the tested part (6) and the fixed wedge shaft (7) stop rotating together; The inertia disc (10) drives the rotating wedge shaft (8) to continue to rotate by inertia, and when it rotates by 108°, the rotating wedge shaft (8) collides with the fixed wedge shaft (7) at the impact surface and transmits kinetic energy to the tested part (6). The strain, speed and torque data of the tested part (6) are collected by the torque speed meter (9) for impact process analysis; After the collision is completed, the brake (4) is released after the variable frequency motor (1) stops rotating.

Images