A sloping drum test device

Abstract

The application provides a slope-changing drum test device and relates to the technical field of automobile test and detection. The drum test device comprises a drum, a gearbox, an inertial mass block and a detection structure connected in sequence, further comprises a drum fixing table for supporting the drum, the drum fixing table is arranged on both sides of the drum, and a self-balancing structure for adjusting the inclination degree of the drum is arranged below the drum fixing table. The drum test device changes the rotation speed of the drum through the gearbox, influences the friction force of the automobile wheel on the drum, and then realizes slope simulation in cooperation with the self-balancing structure. The self-balancing structure controls the inclination degree of itself through the lever principle, and then realizes the test of automobile rollover prevention.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile test and detection, in particular to a drum test device capable of changing slope. BACKGROUND

[0002] Commercial vehicles mainly undertake long-distance transportation tasks, and the terrain in China is mainly mountainous and hilly. The undulating road will inevitably lead to changes in torque to maintain vehicle speed, resulting in an increase in fuel consumption and poor fuel economy. Higher fuel consumption increases the cost of logistics transportation, and reducing fuel consumption has become one of the main research directions in the field of commercial vehicles.

[0003] At present, the advanced auxiliary driving system (such as the predictive cruise control (PCC) system) of commercial vehicles is a relatively mature technology, which can obtain the slope information after road network reconstruction, solve the optimal torque output and gear position on the road in front of the vehicle, control the engine to work at the optimal torque for fuel economy, and adjust the vehicle speed, thereby realizing optimal control based on the front road network reconstruction to reduce fuel consumption. Based on the test requirements of the energy-saving indicators of the advanced auxiliary driving of commercial vehicles, a test device for simulating the continuous change of the slope of a specific road spectrum is studied to provide a test road for the fuel-saving performance indicators of the advanced auxiliary driving system of commercial vehicles.

[0004] However, in the existing test device, the test device cannot continuously change the road slope simulation during the test. In the known technology, many vehicle manufacturers and testing agencies are researching predictive cruise control technology, but in the known research progress, the test bench must be stopped to change the data and parameters of the test bench, thereby changing the simulation degree of the slope, and the existing test bench cannot simulate and test the anti-rollover data of the vehicle. SUMMARY

[0005] Therefore, the present application aims to provide a drum test device capable of changing slope to solve the technical problems in the prior art that the test device can only change the data and parameters of the test bench after the test bench is stopped, cannot continuously change the road slope simulation, and the existing test bench cannot simulate and test the anti-rollover data of the vehicle.

[0006] To achieve the above-mentioned purpose, the present application provides a drum test device capable of changing slope, which comprises a drum, a gearbox, an inertia mass block and a detection structure connected in sequence, and further comprises a drum fixing table for supporting the drum, the drum fixing table being arranged on both sides of the drum, and a self-balancing structure for adjusting the inclination degree of the drum being arranged below the drum fixing table.

[0007] According to an optional embodiment, the drum fixing table comprises support arms and a sliding plate, the support arms are arranged on both sides of the drum and connected with the drum through a rotating shaft, and the sliding plate is arranged below the support arms and fixedly connected with the support arms.

[0008] According to an optional embodiment, a sliding structure for enabling the drum fixing table to slide is arranged between the sliding plate and the self-balancing structure, the sliding structure comprises a sliding groove and a sliding block matched with each other, the sliding groove is arranged on the top surface of the self-balancing structure, and the sliding block is fixedly arranged below the sliding plate.

[0009] According to an optional embodiment, the self-balancing structure comprises a fixed plate, a balancing plate, a base and a cylinder group, the sliding groove is arranged on the upper surface of the fixed plate, the fixed plate is arranged above the base, the balancing plate and the cylinder group are vertically arranged between the fixed plate and the base, the cylinder group drives the fixed plate to move up and down, and the upper surface of the balancing plate is movably connected with the fixed plate.

[0010] According to an optional embodiment, the cylinder group comprises four driving cylinders, two of which are arranged on one side of the balancing plate, and the other two are arranged on the other side of the balancing plate.

[0011] According to an optional embodiment, the gearbox is internally provided with a resistance structure, a regular structure and a vertical partition plate, a strip-shaped hole is arranged on the partition plate, a spiral shaft is arranged in the strip-shaped hole, a cylinder assembly for driving the spiral shaft to move up and down is arranged below the spiral shaft, and the spiral shaft is drivingly connected with the resistance structure or the regular structure at different heights under the driving of the cylinder assembly.

[0012] According to an optional embodiment, the resistance structure comprises a first connecting gear, a transition gear, an outer ring gear, a first conical gear, a second conical gear and a resistance shaft, the first connecting gear is arranged below the spiral shaft and can be meshingly connected with the spiral shaft, the transition gear is coaxially arranged with the first connecting gear, the first connecting gear drives the transition gear to rotate, the transition gear is meshingly and drivingly connected with the outer ring gear, the outer ring gear is coaxially arranged with the first conical gear, the second conical gear is meshingly and drivingly connected with the first conical gear, and the resistance shaft passes through the second conical gear.

[0013] According to an optional embodiment, the regular structure comprises a second connecting gear, a third conical gear and a fourth conical gear, the second connecting gear is arranged above the spiral shaft and can also be meshingly connected with the spiral shaft, the third conical gear is coaxially arranged with the second connecting gear, and the fourth conical gear is meshingly and drivingly connected with the third conical gear.

[0014] According to one optional embodiment, it further includes a wheel lifting structure, which includes a base plate, an X-shaped lifting frame, a lifting cylinder, and a rotating drum. The base plate is provided with a recessed sliding area, the X-shaped lifting frame is slidably disposed in the recessed sliding area, and crossbeams are provided on both the upper and lower parts of the X-shaped lifting frame. The two ends of the lifting cylinder are fixed on the crossbeams, and the rotating drum is disposed on the top of the X-shaped lifting frame.

[0015] According to one optional embodiment, the device further includes a water cooling mechanism, which includes a water cooling box and water cooling pipes, the water cooling pipes running through the entire drum test device, and the water cooling box being connected to a water circulation device.

[0016] The rotary drum testing device with adjustable slope provided by this invention has the following technical advantages:

[0017] This type of rotating drum test device for changing slope includes a rotating drum, a gearbox, an inertial mass block, a detection structure, and a rotating drum fixing platform connected in sequence. The rotating drum fixing platform is located on both sides of the rotating drum to support it. There is a self-balancing structure under the rotating drum fixing platform. This invention changes the rotation speed of the rotating drum through the gearbox, affecting the friction force of the car wheels on the rotating drum, and then, in conjunction with the self-balancing structure, achieves slope simulation. The self-balancing structure controls its own tilt degree through the lever principle, thereby realizing the test of preventing the car from rolling over. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a drum testing device according to an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 Side sectional view of the drum fixing platform of the rotating drum test device;

[0021] Figure 3 yes Figure 1 Top view of the sliding structure of the rotary drum test device;

[0022] Figure 4 yes Figure 1 A schematic diagram of the internal structure of the gearbox in the rotary drum test device;

[0023] Figure 5 yes Figure 4Enlarged view of the middle A;

[0024] Figure 6 is Figure 4 Another angle schematic view of the gearbox interior;

[0025] Figure 7 is Figure 1 Structure schematic view of the wheel lifting structure of the drum test device.

[0026] wherein, Figures 1-7 :

[0027] 1. The drum;

[0028] 2. The gearbox; 21, the partition; 22, the strip-shaped hole; 23, the spiral shaft; 24, the cylinder assembly; 241, the supporting cylinder; 242, the supporting seat; 243, the concave groove; 25, the resistance structure; 251, the first connecting gear; 252, the transition gear; 253, the outer ring gear; 254, the first bevel gear; 255, the second bevel gear; 256, the resistance shaft; 26, the conventional structure; 261, the second connecting gear; 262, the third bevel gear; 263, the fourth bevel gear; 264, the conventional shaft;

[0029] 3. The inertia mass; 4, the detection structure; 5, the shaft coupling; 6, the drum fixing table; 61, the sliding plate; 611, the sliding block; 62, the supporting arm; 63, the limiting block; 7, the self-balancing structure; 71, the fixed plate; 711, the sliding groove; 712, the limiting groove; 72, the balancing plate; 73, the base; 74, the driving cylinder; 75, the spring; 76, the cylindrical slot; 77, the cylindrical rotating shaft;

[0030] 8. The wheel lifting structure; 81, the bottom plate; 811, the recessed sliding area; 82, the X-shaped lifting frame; 821, the cross frame; 83, the lifting cylinder; 84, the rotating drum. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0032] As described in the background, many car companies and testing institutions in the prior art are researching predictive cruise control technology, but in the known research progress, the test bench can only be stopped to change the data and parameters of the test bench, thereby changing the simulation degree of the slope, and the test bench cannot simulate and test the anti-rollover data of the automobile.

[0033] Based on this, the present invention provides a rotating drum test device for changing the slope. The rotation speed of the drum is changed by the gearbox, which affects the friction force of the car wheels on the drum. In turn, the slope is simulated by a self-balancing structure. The self-balancing structure controls its tilt degree through the lever principle, thereby realizing the test of preventing the car from rolling over.

[0034] The following is a specific example. Figures 1-7 The embodiments of the present invention will be described in further detail below.

[0035] like Figure 1 The diagram shown is a schematic diagram of a rotating drum test device with a variable slope according to an embodiment of the present invention. The rotating drum test device includes a rotating drum 1, a gearbox 2, an inertial mass block 3, and a detection structure 4. The rotating drum 1, gearbox 2, inertial mass block 3, and detection structure 4 are connected in sequence. A coupling 5 is provided between the rotating drum 1 and the gearbox 2. The coupling 5 is fixed on the shaft of the gearbox 2, and the rotating drum 1 and the coupling 5 are detachably connected.

[0036] The drum 1 also has drum fixing platforms 6 on both sides, which are used to support the drum 1. A self-balancing structure 7 is provided below the drum fixing platform 6, which is used to adjust the tilt of the drum 1.

[0037] Specifically, such as Figure 1 and Figure 2 As shown, the drum fixing platform 6 includes a support arm 62 and a slide plate 61. The support arm 62 is located on both sides of the drum 1 and is connected to the drum 1 through a rotating shaft. The support arm 62 is frustoconical in shape, and its top is connected to the drum 1 through a rotating shaft. The slide plate 61 is located below the support arm 62 and is fixedly connected to the support arm 62. The fixed connection here is preferably integrally formed, that is, the support arm 62 and the slide plate 61 are stamped together in one piece.

[0038] In order to enable the drum mounting platform 6 to slide back and forth within a certain range on the self-balancing structure 7, such as Figure 3 As shown, the slide plate 61 of the drum fixing platform 6 has a sliding structure between it and the fixing plate 71 of the self-balancing structure 7. The sliding structure allows the drum fixing platform 6 to slide on the fixing plate 71 of the self-balancing structure 7.

[0039] The sliding structure of this embodiment includes a sliding groove 711 and a slider 611 that cooperate with each other. The slider 611 is located on the bottom surface of the slide plate 61 and is integrally formed with the slide plate 61. There are four sliders 611, with two sliders 611 forming a group. The sliding groove 711 is located on the top surface of the fixing plate 71 and is formed by an inward recess in the surface of the fixing plate 71. There are two sliding grooves 711, and the two groups of sliders 611 are slidably connected to the sliding grooves 711. Figure 2 As shown.

[0040] In addition, such as Figure 3As shown, the sliding structure further comprises a limiting block 63, which functions to prevent the sliding block 611 from sliding too far. The sliding groove 711 has limiting grooves 712 on both sides, which are formed by the inward recess of the surface of the fixed plate 71. The limiting block 63 is slidably arranged in the limiting groove 712, which can limit the sliding of the sliding block 611, that is, the sliding block 611 can slide within a certain range. When the limiting block 63 slides to one end of the limiting groove 712, the sliding block 611 cannot slide.

[0041] The self-balancing structure 7 of the embodiment comprises a fixed plate 71, a balancing plate 72, a base 73, and a cylinder group, as shown in Figure 1 The fixed plate 71 is arranged above the base 73 at a certain distance therefrom, and the balancing plate 72 and the cylinder group are vertically arranged between the fixed plate 71 and the base 73. The cylinder group drives the fixed plate 71 to move up and down, and the upper side of the balancing plate 72 is movably connected with the fixed plate 71.

[0042] Further, as shown in Figure 1 The cylinder group is composed of four driving cylinders 74, two of which are arranged on one side of the balancing plate 72, and the other two are arranged on the other side of the balancing plate 72. A spring 75 is sleeved on the air rod of each driving cylinder 74, and the upper and lower ends of the driving cylinder are fixedly connected with the fixed plate 71 and the base 73, respectively.

[0043] The bottom surface of the fixed plate 71 is provided with a cylindrical slot 76, and the upper top surface of the balancing plate 72 is provided with a cylindrical rotating shaft 77. The bottom surface of the fixed plate 71 is movably connected with the upper side of the balancing plate 72. The driving cylinders 74 on both sides are in a half-extended state in normal times. The four driving cylinders 74 are connected with a control system, which controls the four driving cylinders 74 on both sides to control the balance of the fixed plate 71. The sliding structure arranged on the fixed plate 71 drives the drum fixing table 6 on both sides of the rotating drum 1 to move up and down, thereby controlling the inclination of the rotating drum 1, and testing the anti-rollover data of the vehicle.

[0044] Specifically, as shown in Figures 4-6 The transmission 2 has a resistance structure 25, a conventional structure 26, and a vertical partition plate 21. The resistance structure 25 enables the rotating drum 1 to realize a resistance mode, and the conventional structure 26 enables the rotating drum 1 to realize a conventional mode. The partition plate 21 is provided with a strip-shaped hole 22 extending from the upper side to the lower side of the partition plate 21. A spiral shaft 23 is arranged in the strip-shaped hole 22. A cylinder assembly 24 is arranged below the spiral shaft 23 to drive the spiral shaft 23 to move up and down. The spiral shaft 23 is drivingly connected with the resistance structure 25 or the conventional structure 26 at different heights under the driving of the cylinder assembly 24.

[0045] Further, as shown in Figures 4-6 The support cylinder 241 is composed of a support cylinder 241 and a support seat 242, wherein the support cylinder 241 is a double-rod support cylinder 241, the support seat 242 is fixedly connected with the air rod top of the double-rod support cylinder 241, the upper side of the support seat 242 is provided with a concave groove, the concave groove 243 is used for supporting the spiral shaft 23, the up-and-down movement of the spiral shaft 23 is changed by the up-and-down movement of the air rod of the support cylinder 241, and the resistance structure 25 and the conventional structure 26 are respectively located on the upper side and the lower side of the spiral shaft 23.

[0046] The resistance structure 25 of the embodiment comprises a first connecting gear 251, a transition gear 252, an outer ring gear 253, a second bevel gear 255 and a resistance shaft 256, as shown in Figure 4 and Figure 5 The first connecting gear 251 is arranged below the spiral shaft 23 and can be in meshing transmission with the spiral shaft 23, the transition gear 252 is coaxially arranged with the first connecting gear 251, the first connecting gear 251 drives the transition gear 252 to rotate, the transition gear 252 is in meshing transmission connection with the outer ring gear 253, the outer ring gear 253 is coaxially arranged with the second bevel gear 255 and 254, the second bevel gear is in meshing transmission connection with the second bevel gear 255 and 254, and the resistance shaft 256 passes through the second bevel gear.

[0047] Specifically, the support seat 242 drives the spiral shaft 23 to move downward under the driving of the support cylinder 241, the spiral shaft 23 rotates under the driving of an external force, the spiral shaft 23 drives the first connecting gear 251 to rotate, the first connecting gear 251 drives the transition gear 252 to rotate, the transition gear 252 drives the outer ring gear 253 to rotate, the outer ring gear 253 drives the second bevel gear 255 and 254 to rotate, the second bevel gear 255 and 254 drives the second bevel gear to rotate, and the resistance shaft 256 is drivingly connected with the rotating drum 1. Since the power is transmitted through a plurality of gears, the resistance is increased in the transmission process, so that the transmission efficiency is reduced, and the rotating drum 1 is further fed back, so that the rotating speed of the rotating drum 1 is reduced, and the slope simulation in the automobile rotating drum test is realized.

[0048] The conventional structure 26 of the embodiment comprises a second connecting gear 261, a third bevel gear 262 and a fourth bevel gear 263, as shown in Figure 4 and Figure 6 The second connecting gear 261 is arranged above the spiral shaft 23 and can be in meshing transmission with the spiral shaft 23, the third bevel gear 262 is coaxially arranged with the second connecting gear 261, and the fourth bevel gear 263 is in meshing transmission connection with the third bevel gear 262.

[0049] Specific process is: support seat 242 in support cylinder 241 drive helical shaft 23 upward movement, helical shaft 23 under the drive of external force rotates, helical shaft 23 rotation drives second connecting gear 261 rotation, second connecting gear 261 rotation drives third bevel gear 262 rotation, third bevel gear 262 drives fourth bevel gear 263 rotation, fourth bevel gear 263 through the conventional shaft 264 power transmission to rotary drum 1.

[0050] Need to be explained, the third bevel gear 262 and the fourth bevel gear 263 of the embodiment are consistent in size, the second bevel gear 255 254 and the second bevel gear are consistent in size, the third bevel gear 262 and the fourth bevel gear 263 are smaller in size than the second bevel gear 255 254 and the second bevel gear, and the number of gears of the conventional structure 26 is also less than the gear format of the resistance structure 25, so that the resistance structure 25 is relatively the conventional structure 26, the power transmission efficiency is lower.

[0051] More specifically, as shown in Figure 7 Also includes wheel lifting structure 8, wheel lifting structure 8 includes bottom plate 81, X type lifting frame 82, lifting cylinder 83 and rotary drum 84, bottom plate 81 is provided with recessed sliding area 811, X type lifting frame 82 is slidably provided in recessed sliding area 811, X type lifting frame 82 is provided with horizontal frame 821 on the upper and lower parts, lifting cylinder 83 is fixed on the horizontal frame 821, rotary drum 84 is provided on the top of X type lifting frame 82.

[0052] Need to be explained, here X type lifting frame 82 is slidably provided in recessed sliding area 811 means that when lifting cylinder 83 drives the two frame bodies of X type lifting frame 82 to rotate, the bottom of X type lifting frame 82 can slide in recessed sliding area 811.

[0053] The embodiment controls the height of the whole X type lifting frame 82 through lifting cylinder 83, so as to realize the lifting of the wheel, and the whole wheel lifting structure 8 is provided on both sides of rotary drum 1, which will not affect the operation of rotary drum 1.

[0054] More specifically, the cooling device includes a water-cooled tank and a water-cooled pipe, the water-cooled pipe penetrates through the whole device, the water-cooled tank is connected to a water circulation device, and the water in the water-cooled tank is circulated in the whole device through the water circulation device, so as to achieve the effect of cooling the device (the water-cooled tank and the water circulation device are conventional structures 26, and therefore will not be described here).

[0055] The embodiment changes the structure of the gearbox 2 of the drum test device, changes the rotating speed of the drum 1 through the feedback of the gearbox 2, further affects the friction of the automobile wheel on the drum 1, and further realizes the slope simulation of the drum 1 test bench, and further sets the self-balancing structure 7 below the drum 1, controls the inclination of the balance plate 72 of the lever through the lever principle and the driving cylinders 74 arranged on both sides of the lever, and further realizes the test of the automobile rollover prevention, and further sets the wheel lifting structure 8, which facilitates the placement of the automobile and increases the practicability of the test device.

[0056] The use method of the drum test device with changed slope of the embodiment comprises the following steps.

[0057] (1) Before testing, the balance plate 72 in the self-balancing structure 7 is in a horizontal state, the gearbox 2 is in a conventional mode, the automobile runs, and the test is realized through the drum 1;

[0058] (2) When testing the rollover prevention test, the cylinder group runs, the balance plate 72 is inclined, and the rollover prevention test is completed;

[0059] (3) When changing the slope simulation of the automobile test, the screw shaft 23 is lowered through the descending of the air rod of the supporting cylinder 241, the screw shaft 23 is connected with the first connecting gear 251, the resistance shaft 256 is rotated through the transition gear 252, the outer ring gear 253, the first bevel gear 254 and the second bevel gear, and the gearbox 2 is switched to the resistance structure 25, and the feedback is realized on the drum 1, the rotating speed of the drum 1 is changed, and the slope simulation of the automobile drum test is realized.

[0060] In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "a plurality of" is two or more than two; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0061] In the description of the application, it also needs to be explained that unless there is a clear and specific provision and limitation, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0062] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A slope changing drum test device comprising a drum, a gear box, an inertia mass and a detection structure connected in series, characterized in that, Also include a rotating drum fixing table for supporting the rotating drum, the rotating drum fixing table is arranged on both sides of the rotating drum, the rotating drum fixing table is provided with a self-balancing structure below for adjusting the degree of inclination of the rotating drum; The gearbox is provided with resistance structure, conventional structure and vertical partition plate, the partition plate is provided with strip-shaped hole, the screw shaft is arranged in the strip-shaped hole, the screw shaft is provided with cylinder assembly below for driving the screw shaft to move up and down, the screw shaft is driven to move at different heights by the cylinder assembly and is drivingly connected with the resistance structure or the conventional structure.

2. A changing-gradient drum test apparatus according to claim 1, characterized in that The rotating drum fixing table includes support arms and a sliding plate, the support arms are arranged on both sides of the rotating drum and are connected with the rotating drum through rotating shafts, and the sliding plate is arranged below the support arms and is fixedly connected with the support arms.

3. A changing-gradient drum test apparatus according to claim 2, wherein A sliding structure is arranged between the sliding plate and the self-balancing structure for enabling the rotating drum fixing table to slide, the sliding structure includes sliding grooves and sliding blocks matched with each other, the sliding grooves are located on the top surface of the self-balancing structure, and the sliding blocks are fixedly arranged below the sliding plate.

4. A changing-gradient drum test apparatus according to claim 3, wherein The self-balancing structure includes a fixed plate, a balance plate, a base and a cylinder group, the sliding grooves are arranged on the upper surface of the fixed plate, the fixed plate is arranged above the base, the balance plate and the cylinder group are vertically arranged between the fixed plate and the base, the cylinder group drives the fixed plate to move up and down, and the balance plate is movably connected with the fixed plate above.

5. A changing-gradient drum test apparatus according to claim 4, wherein The cylinder group includes four driving cylinders, two of which are arranged on one side of the balance plate, and the other two are arranged on the other side of the balance plate.

6. The changing grade drum test device of claim 1, wherein, The resistance structure includes a first connecting gear, a transition gear, an outer ring gear, a first conical gear, a second conical gear and a resistance shaft, the first connecting gear is arranged below the screw shaft and can be meshingly connected with the screw shaft, the transition gear is coaxially arranged with the first connecting gear, the first connecting gear drives the transition gear to rotate, the transition gear is meshingly connected with the outer ring gear, the outer ring gear is coaxially arranged with the first conical gear, the second conical gear is meshingly connected with the first conical gear, and the resistance shaft passes through the second conical gear.

7. The changing grade drum test device of claim 1, wherein, The conventional structure includes a second connecting gear, a third conical gear and a fourth conical gear, the second connecting gear is arranged above the screw shaft and can also be meshingly connected with the screw shaft, the third conical gear is coaxially arranged with the second connecting gear, and the fourth conical gear is meshingly connected with the third conical gear.

8. The changing grade drum test device of claim 1, wherein, Also include a wheel lifting structure, the wheel lifting structure includes a bottom plate, an X-shaped lifting frame, lifting cylinders and a rotating drum, the bottom plate is provided with a recessed sliding area, the X-shaped lifting frame is slidably arranged in the recessed sliding area, horizontal frames are arranged on the upper and lower parts of the X-shaped lifting frame, the ends of the lifting cylinders are fixed on the horizontal frames, and the rotating drum is arranged on the top of the X-shaped lifting frame.

9. The changing grade drum test device of claim 1, wherein, The water cooling mechanism comprises a water cooling tank and a water cooling pipe, the water cooling pipe runs through the whole drum test device, and the water cooling tank is connected with a water circulation device.

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