Tire loading fatigue test device and test method

Abstract

The invention relates to a tire loading fatigue test device and a test method, belonging to the technical field of aviation tires, and is characterized in that a driving part comprises a driving large roller and a motor assembly driving the driving large roller to move; a loading part clamping the test tire; the loading part comprises a sliding base parallel to the driving large roller axis and a loading head device capable of clamping multiple test tires at the same time; a horizontal transverse slide is provided on the sliding base, and a transverse driving device is provided to enable the loading head device to move laterally to change the test tire, and the loading head device is connected to the sliding base through the horizontal transverse slide; a longitudinal feeding part driving the loading part to realize longitudinal movement on a horizontal plane; the longitudinal feeding part comprises a test bench base, a longitudinal driving frame and a longitudinal driving unit driving the longitudinal driving frame to move; one end of the longitudinal driving frame is vertically fixedly connected to the sliding base, and the other end of the longitudinal driving frame is connected to the movable end of the longitudinal driving unit.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation tires, and in particular relates to a tire loading fatigue test device and a test method. Background Art

[0002] When the aircraft tire is loaded for fatigue testing, the high-speed friction rotation will cause the tire to heat up, and as the test time increases, the temperature rise continues to increase until it approaches the temperature limit allowed by the rubber tire. At this time, the test must be stopped and the tire temperature must be waited for to drop. In fact, in the test, the waiting time for cooling is often longer than the loading test time, resulting in long waiting time and low test efficiency. At present, it is understood that the aircraft tire loading test device is a single tire loading head structure, which can only accelerate the cooling of the tire by fan air supply, but this method has a limited cooling speed and cannot solve the problem of downtime caused by temperature rise. Summary of the invention

[0003] The present invention provides a tire loading fatigue test device and a test method to solve the technical problems existing in the known technology. The tire loading fatigue test device and the test method are used to test tires that reach the temperature limit, and can quickly perform rotation tests to avoid downtime and waiting, thereby improving test efficiency.

[0004] The first object of the present invention is to provide a tire loading fatigue test device, comprising:

[0005] A driving unit, the driving unit comprising a driving large roller (1) and a motor assembly that drives the driving large roller (1) to move;

[0006] A loading part for clamping a test tire (2); the loading part comprises a sliding base (12) parallel to the axis of the driving large roller (1), a loading head device (3) capable of clamping a plurality of test tires (2) at the same time, and a transverse driving device (10) for driving the loading head device (3) to move transversely; a horizontal slideway is provided on the sliding base, and the loading head device (3) is connected to the sliding base (12) via the horizontal slideway;

[0007] A longitudinal feed part drives the loading part to realize longitudinal movement on a horizontal plane; the longitudinal feed part comprises a test bench base (5), a longitudinal drive frame and a longitudinal drive unit that drives the longitudinal drive frame to move; one end of the longitudinal drive frame is vertically fixedly connected to the sliding base, and the other end of the longitudinal drive frame is connected to the movable end of the longitudinal drive unit.

[0008] Furthermore, the loading head device (3) comprises a plurality of brackets parallel to each other, one end of each bracket being clamped with a horizontal slideway of a sliding base, and the other end of each bracket being provided with a half-bearing axle seat (7) connected to a test tire (2).

[0009] Furthermore, the longitudinal drive unit is a telescopic loading cylinder (6), the outer shell of the telescopic loading cylinder (6) is fixedly connected to the test bench base (5), and the telescopic rod of the telescopic loading cylinder (6) is fixedly connected to the longitudinal drive frame.

[0010] Furthermore, the bracket comprises a left bracket (13) and a right bracket (9); the left bracket (13) and the right bracket (9) are provided with a "["-shaped slide groove on the opposite surfaces thereof, and a plurality of "concave" grooves are longitudinally provided on the slide groove; the sliding bracket (8) is connected to the slide groove through a T-shaped clamping bolt; a vertical pin shaft hole is provided on the sliding bracket (8); the sliding bracket (8) is connected to the middle half-bearing shaft seat (15) through a pin shaft; the ends of the left bracket (13) and the right bracket (9) are provided with half-bearing shaft seats (7).

[0011] Furthermore, the transverse driving device (10) includes: a rack (19) arranged on a sliding base (12); the left bracket (13) and the right bracket (9) are connected via an intermediate connecting rod (11); a driving support (16) is fixed to the side of the right bracket (9); a driving gear (18) and a driving motor (20) are installed on the driving support (16); the driving motor (20) is connected to the driving gear (18) via a transmission shaft (21), and the driving gear (18) and the rack (19) are meshed.

[0012] Furthermore, a displacement sensor (17) for detecting the horizontal lateral displacement of the loading head device (3) is installed on the above-mentioned driving support (16).

[0013] A second object of the present invention is to provide a testing method for a tire loading fatigue testing device, comprising the following steps:

[0014] S1, installing a plurality of test tires (2) on a loading head device (3);

[0015] S2, turning on the driving unit to drive the large roller (1) to rotate at a required speed;

[0016] S3, the test tire (2) moves laterally along the sliding base through a horizontal slideway, so that one of the test tires (2) is coplanar with the driving large roller (1);

[0017] S4, the test tire (2) is brought into close contact with the driving large roller (1) through the longitudinal feeding part, and the test tire (2) is rotated under the drive of the driving large roller (1). When the temperature of the test tire (2) reaches the upper limit of the allowable temperature, the stage test data is recorded, and the test tire (2) is separated from the driving large roller (1) through the longitudinal feeding part;

[0018] S5. Repeat S3 and S4 until each test tire (2) is tested for the first time;

[0019] S6. Repeat S3 and S4, perform multiple tests on each test tire (2), and accumulate the test data of each test tire at each stage.

[0020] The advantages and positive effects of the present invention are:

[0021] The present invention is used to control the temperature rise of the tire and improve the test efficiency during the tire loading fatigue test; specifically:

[0022] The present invention realizes automatic sequential feeding and unloading of test tires through lateral and longitudinal feeding mechanisms; that is, when the first test tire reaches the upper limit of the allowable temperature, it can be quickly switched to the second test tire, and when the third tire reaches the upper limit of the allowable temperature, the first test tire completes the cooling process and can enter the test process again. Obviously, the present invention can improve the efficiency of the test; at the same time, the sliding bracket between the left bracket and the right bracket and the middle half-wall axle seat can realize the test of the middle test tire with an inclination angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the overall structure diagram of the aviation tire fatigue loading test bench of the present invention;

[0024] Figure 2 It is a structural diagram of a three-tire loading head device of the present invention;

[0025] Figure 3 It is a structural diagram of the lateral movement drive of the three-tire loading head device of the present invention;

[0026] Figure 4 It is a flow chart of the present invention.

[0027] In the figure: 1. driving large roller; 2. test tire; 3. loading head device; 4. main telescopic frame; 5. test bench base; 6. telescopic loading cylinder; 7. half-bearing shaft seat; 8. sliding bracket; 9. right bracket; 10. bracket transverse movement driving device; 11. middle connecting rod; 12. sliding base; 13. left bracket; 14. T-type clamping bolt; 15. middle half-bearing shaft seat; 16. driving support; 17. shift sensor; 18. driving gear; 11-1. upper middle connecting rod; 11-2. lower middle connecting rod; 19. rack; 20. driving motor; 21. transmission shaft. DETAILED DESCRIPTION

[0028] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0029] See also Figures 1 to 3 , a tire loading fatigue test device, comprising:

[0030] A driving unit, the driving unit includes a driving large roller 1 and a motor assembly that drives the driving large roller 1 to move;

[0031] A loading part for clamping the test tire 2; the loading part comprises a transverse sliding base 12 parallel to the axis of the driving large roller 1, a loading head device 3 capable of clamping multiple test tires 2 at the same time, and a transverse driving device 10 for driving the loading head device 3 to move transversely; a horizontal slide is provided on the sliding base, the loading head device 3 is connected to the sliding base through the horizontal slide, and the transverse driving device 10 can realize the transverse change of the test tire;

[0032] A longitudinal feed part drives the loading part to realize longitudinal movement on the horizontal plane; the longitudinal feed part includes a test bench base 5, a longitudinal drive frame and a longitudinal drive unit that drives the longitudinal drive frame to move; one end of the longitudinal drive frame is vertically fixedly connected to the sliding base, and the other end of the longitudinal drive frame is connected to the movable end of the longitudinal drive unit. In order to achieve force balance, the longitudinal drive frame is connected to the main telescopic frame 4, so that the main telescopic frame 4 and the loading part realize a multi-point connection relationship, thereby achieving uniform force.

[0033] The loading head device 3 includes a plurality of brackets parallel to each other, one end of each bracket is clamped with a horizontal slideway of a sliding base, and the other end of each bracket is provided with a half-bearing axle seat 7 connected to the test tire 2 .

[0034] The longitudinal driving unit is a telescopic loading cylinder 6 , a shell of which is fixedly connected to the test bench base 5 , and a telescopic rod of which is fixedly connected to the longitudinal driving frame.

[0035] The transverse direction and the longitudinal direction in the present application are two directions perpendicular to each other in the horizontal plane, wherein the longitudinal direction refers to the direction perpendicular to the driving large roller axis, and the transverse direction refers to the direction parallel to the driving large roller axis;

[0036] The bracket includes a left bracket 13 and a right bracket 9; the opposite surfaces of the left bracket 13 and the right bracket 9 are installed with a "["-shaped slide groove, and the slide groove has multiple "concave" grooves longitudinally. The sliding bracket 8 is connected to the slide groove through a T-shaped clamping bolt, and a vertical pin shaft hole is opened on the sliding bracket 8. The sliding bracket 8 is connected to the middle half-bearing shaft seat 15 through a pin shaft; the ends of the left bracket 13 and the right bracket 9 are installed with half-bearing shaft seats 7.

[0037] The sliding base 12 is provided with a rack 19 parallel to the horizontal sliding. The left bracket 13 and the right bracket 9 are connected by an intermediate connecting rod 11. A driving support 16 is fixed to the side of the right bracket 9. A driving gear 18 and a driving motor 20 are installed on the driving support 16; the driving motor 20 is connected to the driving gear 18 through a transmission shaft 21, and the driving gear 18 and the rack 19 are meshed.

[0038] A displacement sensor 17 for detecting the horizontal lateral displacement of the loading head device 3 is installed on the driving support 16 .

[0039] Tire fatigue testing requires long-term high-speed rolling testing with designed loading, such as Figure 1 As shown: 3 test tires 2 are mounted side by side on the loading head device 3. During the test, the driving roller 1 rotates first according to the tire test speed requirement. The loading head device is connected to the main telescopic frame 4 and is pushed by the telescopic loading cylinder 6. It is pushed out horizontally along the track of the test bench base 5 to perform a pressure test on one of the tires according to the required load. When the temperature of the loaded test tire rises to a temperature close to the allowable temperature rise, the main loading cylinder retracts, and the loading head device can move laterally to align another tire with the driving roller, and then perform a loading test on the second tire..., and then perform a loading test on the third tire. When the test reaches the temperature limit of the third tire, the temperature of the first tire has completely dropped, and the repeated loading test can be continued. In this way, the three tires are tested in rotation without interruption until the test is completed.

[0040] like Figure 2 As shown: the left bracket 13 and the right bracket 9 can be respectively equipped with one test tire in a cantilever state through their respective half-bearing axle seats 7. Two sliding brackets 8 are respectively installed on the inner side of the left and right brackets, and the third test tire is installed through a pair of intermediate half-bearing axle seats 15. According to the different extension lengths of the left and right sliding brackets, the requirements for the roll angle of the third test tire can be achieved. The tail of the left and right brackets is a dovetail groove structure, which is installed on the sliding base 12 and connected in parallel through the upper and lower intermediate connecting rods 11. The bracket transverse driving device 10 can achieve the lateral translation of the three test tires.

[0041] According to the test requirements of different tires, different parameters such as driving large roller speed, tire loading pressure, tire test temperature limit time, lateral movement distance of three tires, etc. can be set. The whole test can be automatically controlled by the program, and the three tires are rotated for loading test, and the test data of each tire is accumulated.

[0042] The loading requirements of the intermediate test tire roll angle test can be achieved by extending the left and right sliding brackets to different lengths. The structure is that a "["-shaped slide groove is set inside the left and right brackets, and after the sliding brackets on both sides are adjusted to the required position along the slide groove, they are fixed with T-type clamping bolts 14 to ensure the roll angle state of the intermediate tire.

[0043] like Figure 3 As shown: the loading head device includes a sliding base, a left bracket, a right bracket, a pair of sliding brackets in the middle, a pair of intermediate connecting rods 11 (upper intermediate connecting rod 11-1 and lower intermediate connecting rod 11-2) arranged above and below, and a bracket transverse movement driving device;

[0044] The left bracket, the right bracket and the sliding base are connected with a dovetail groove structure. The left and right brackets can slide horizontally on the sliding base to align the test tire with the driving large roller. The sliding base is connected to the main telescopic frame. The main telescopic frame can be longitudinally extended along the test bench base track to achieve tire loading and unloading. Depending on the size of the tire, the loading range can be from tens of kilograms to 20 tons;

[0045] There is a half-wall axle seat at the front end of the left bracket and the right bracket, which can fix the tire axle on the side cantilever. There is a pair of sliding brackets in the middle, one extending and the other contracting, which can make the "tire-axle" produce a roll angle. The hinged half-wall axle seat at the front end can clamp the tire axle with a roll angle. The sliding brackets on both sides are clamped and fixed by bolts in the T-slot, which can achieve a stepless roll angle state, and the maximum roll angle can reach ±20°. The test tire diameter can be applied from 300mm to 1500mm;

[0046] The bracket transverse driving device 10 includes a driving motor 20, a transmission shaft 21, a driving gear 18, and a rack 19; the driving motor-driving gear is fixed to the right bracket through a driving support 16, and the upper and lower middle connecting rods connect the left and right brackets into one, and the rack is fixed to the sliding base. When the driving device is working, the gear drives the rack, and the left and right brackets slide laterally together to adjust the working position of each tire. Limit switches are set at both ends of the sliding base to prevent the left and right brackets from exceeding the travel;

[0047] Testing process:

[0048] A testing method for a tire loading fatigue testing device comprises the following steps:

[0049] S1, installing a plurality of test tires (2) on a loading head device (3);

[0050] S2, turning on the driving unit to drive the large roller (1) to rotate at a required speed;

[0051] S3, the test tire (2) moves laterally along the sliding base through a horizontal slideway, so that one of the test tires (2) is coplanar with the driving large roller (1);

[0052] S4, the test tire (2) is brought into close contact with the driving large roller (1) through the longitudinal feeding part, and the test tire (2) is rotated under the drive of the driving large roller (1). When the temperature of the test tire (2) reaches the upper limit of the allowable temperature, the stage test data is recorded, and the test tire (2) is separated from the driving large roller (1) through the longitudinal feeding part;

[0053] S5. Repeat S3 and S4 until each test tire (2) is tested for the first time;

[0054] S6. Repeat S3 and S4, perform multiple tests on each test tire (2), and accumulate the test data of each test tire at each stage.

[0055] 1) Install the test tire. First retract the loading head device and move the bracket horizontally to the appropriate position; remove the two side half-wall axle covers and the middle pair of half-wall axle covers. If the middle tire has a roll angle requirement, first adjust the telescopic position of the left and right sliding brackets (see the angle scale plate) to roughly meet the roll angle requirement.

[0056] According to the design requirements, three test "tire-axles" are hoisted separately (assemble the tire and axle first). The two side "tire-axles" can be directly fastened by the half-bearing axle covers and fixed with bolts; after the middle "tire-axle" is placed on the half-bearing axle seat, the roll angle must be checked under the support of the crane (the middle half-bearing axle seat can be rotated and equipped with an angle detector). After the sliding bracket is telescoped and fine-tuned to meet the roll angle requirements, the T-type clamping bolts of the sliding bracket are tightened, and the middle pair of half-bearing axle cover bolts are tightened.

[0057] 2) Calibrate the test tires. The three test tires may have different diameters, different rotation speeds, and different loading requirements. It is necessary to calibrate the lateral movement of each tire according to the number of the three tires. The lateral position of the bracket is recorded by the lateral movement sensor (rotary encoder in the lateral movement drive device); the longitudinal position calibration (loading pressure direction, used to calculate the actual rolling radius) is recorded by the travel sensor of the telescopic loading cylinder in the main telescopic frame; the speed of the main drive large roller is determined according to the linear speed requirements of the test tire. In addition, for tires of different diameters, the retracted position of the main frame can be manually set in the test automatic program to reduce unnecessary empty return travel.

[0058] 3) Tire loading test The tire loading test is an automatic control process. The loading load and loading time (based on the time limit for reaching the high temperature of the tire) are set for each tire on the console; the tire linear speed is calculated by the driving large roller speed combined with the actual rolling radius of the tire, and the rolling radius of the tire is calculated by subtracting the difference between the calibrated theoretical radius and the actual extension after loading. The three tires are automatically rotated for loading tests according to the program, and each tire accumulates the test mileage until the test is completed.

[0059] 4) After the test, the process of removing the tire is similar to that of installing the test tire.

[0060] Control system description:

[0061] 1) The electrical control system of the 3 tire loading test bench consists of three parts: the central control console, the hydraulic pump station control cabinet and the on-site operation box.

[0062] 2) The central control console is the control center of the entire control system, which is mainly composed of an operating table cabinet, an industrial computer and two LCD monitors. The industrial computer is mainly responsible for controlling the PLC in the hydraulic pump station module to complete related functional tasks, and transmits test data in real time through the field bus, completes the test curve, and synchronously displays it on the operating table panel.

[0063] 3) The hydraulic pump station control cabinet is mainly used to control the hydraulic system and realize the hydraulic transmission in the test, including the telescopic loading cylinder and the bracket transverse drive motor. Through the field bus PROFIBUS-DP communication, the operation console can realize remote control, and the hydraulic system can also be controlled locally by the operation box.

[0064] 4) The on-site operation box panel consists of buttons and indicator lights, which are mainly used for local control operations. The loading head can be manually moved horizontally and the positions of the three tires can be calibrated locally.

[0065] 5) The test process is carried out in accordance with the requirements of 2) and 3) in the above "Specific Implementation Methods". The test control flow chart is as follows: Figure 4 shown.

[0066] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A tire loading fatigue test device, characterized in that: include: A driving unit, the driving unit comprising a driving large roller and a motor assembly for driving the driving large roller; A loading part for clamping the test tire; the loading part comprises a sliding base parallel to the driving large roller axis, a loading head device capable of clamping multiple test tires at the same time, and a lateral driving device for driving the loading head device to move laterally; a horizontal slideway is provided on the sliding base, and the loading head device is connected to the sliding base through the horizontal slideway; A longitudinal feed part that drives the loading part to realize longitudinal movement on a horizontal plane; the longitudinal feed part comprises a test bench base, a longitudinal drive frame and a longitudinal drive unit that drives the longitudinal drive frame to move; one end of the longitudinal drive frame is vertically fixedly connected to the sliding base, and the other end of the longitudinal drive frame is connected to the movable end of the longitudinal drive unit; The loading head device comprises a plurality of brackets parallel to each other, one end of each bracket is clamped with the horizontal slideway of the sliding base, and the other end of each bracket is installed with a half-bearing axle seat connected to the test tire; The longitudinal driving unit is a telescopic loading cylinder, the shell of which is fixedly connected to the test bench base, and the telescopic rod of which is fixedly connected to the longitudinal driving frame; The bracket comprises a left bracket and a right bracket; the left bracket and the right bracket are provided with a "["-shaped slide groove on the opposite surface, and the slide groove is provided with a plurality of "concave" grooves in the longitudinal direction; the sliding bracket is connected to the slide groove through a T-shaped clamping bolt; a vertical pin shaft hole is provided on the sliding bracket, and the sliding bracket is connected to the middle half-bearing shaft seat through a pin shaft; the ends of the left bracket and the right bracket are provided with half-bearing shaft seats; Through lateral movement and longitudinal feeding, the test tires are automatically fed and unloaded in sequence; when the first test tire reaches the upper limit of the allowable temperature, it can quickly switch to the second test tire, and when the third test tire reaches the upper limit of the allowable temperature, the first test tire completes the cooling process and can enter the test process again; The left bracket and the right bracket are respectively equipped with one test tire in a cantilever state through their respective half-bearing axle seats; a sliding bracket is installed on the inner side of the left and right brackets respectively, and the third test tire is mounted through a pair of middle half-bearing axle seats. According to the different extended lengths of the left and right sliding brackets, the roll angle requirement of the third test tire is achieved.

2. The tire loading fatigue testing device according to claim 1, characterized in that: The transverse driving device includes: a rack arranged on a sliding base, the left bracket and the right bracket are connected by an intermediate connecting rod, a driving support is fixed on the side of the above-mentioned right bracket, and a driving gear and a driving motor are installed on the driving support; the driving motor is connected to the driving gear through a transmission shaft, and the driving gear and the rack are meshed.

3. The tire loading fatigue testing device according to claim 2, characterized in that: A displacement sensor for detecting the horizontal lateral displacement of the loading head device is installed on the above-mentioned driving support.

4. A testing method based on the tire loading fatigue testing device according to claim 1, characterized in that: The steps include: S1. Install multiple test tires on the loading head device; S2, turn on the driving unit to drive the large roller to rotate at the required speed; S3, the test tire moves laterally along the sliding base through the horizontal slideway so that one of the test tires is coplanar with the driving large roller; S4, the test tire is brought into close contact with the driving roller by means of a longitudinal feeding portion, and the test tire is rotated under the drive of the driving roller. When the temperature of the test tire reaches the upper limit of the allowable temperature, the stage test data is recorded, and the test tire is separated from the driving roller by means of the longitudinal feeding portion; S5. Repeat S3 and S4 until each test tire is tested for the first time; S6. Repeat S3 and S4, perform multiple tests on each test tire, and accumulate the test data of each test tire at each stage.

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