Steering system and acceleration loading test equipment

Abstract

The utility model provides a steering system and acceleration loading test equipment. The steering system comprises two steering mechanisms which are respectively arranged at two ends of a rack of the acceleration loading test equipment; the steering mechanism comprises a steering frame, two steering wheel sets and two driving assemblies. The bogie is connected with the rack, and the two steering wheel sets are rotationally connected to the two ends of the bogie correspondingly. The two driving assemblies are arranged on the bogie, the output ends of the two driving assemblies are correspondingly connected with the two steering wheel sets correspondingly, and the two driving assemblies are used for driving the two steering wheel sets to swing in the same direction or in the opposite directions correspondingly. When the two steering wheel sets swing reversely, the acceleration loading test equipment steers in situ. According to the steering system and the accelerated loading test equipment, the steering radius can be reduced, the limitation of the test site area on the position transfer of the accelerated loading test equipment is eliminated, and the steering mode can be flexibly selected according to the actual situation, so that the position transfer flexibility and the adaptability to the test site are improved.

Description

Technical Field

[0001] This utility model belongs to the field of road performance testing technology, specifically relating to a steering system and accelerated loading test equipment. Background Technology

[0002] Accelerated loading test equipment is used to comprehensively simulate the actual service conditions of road materials and structures in special geographical environments, simulate different vehicle axle load compositions, and conduct scientific research on accelerated loading tests of new structures, new materials, and new processes using full-scale tests. To facilitate movement and changes in test sites or loading positions on the road surface, accelerated loading test equipment is usually equipped with a mobile system. However, due to the equipment's large weight and size, while the current mobile system possesses linear displacement and steering capabilities, its large turning radius is caused by limitations in the steering angle. Therefore, the current accelerated loading test equipment has extremely poor mobility and urgently needs improvement. Utility Model Content

[0003] This utility model provides a steering system and an accelerated loading test equipment, which aims to reduce the turning radius of the accelerated loading test equipment and improve the position transfer flexibility of the accelerated loading equipment.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: Firstly, a steering system is provided, comprising two steering mechanisms respectively disposed at both ends of the frame of an accelerated loading test equipment; the steering mechanism includes a bogie, two steering wheel sets, and two drive components;

[0005] The bogie is connected to the frame, and two steering wheel sets are rotatably connected to both ends of the bogie. Two drive components are located on the bogie and their output ends are respectively connected to the two steering wheel sets. The two drive components are used to drive the two steering wheel sets to swing in the same or opposite directions. When the two steering wheel sets swing in opposite directions, the accelerated loading test equipment turns in place.

[0006] In conjunction with the first aspect, in one possible implementation, the steering wheel assembly includes a load-bearing wheel cover, a traveling wheel rotatably connected to the load-bearing wheel cover, and a rotary drive component disposed on the load-bearing wheel cover and used to drive the traveling wheel to roll on the ground; the bogie is provided with a slewing support bearing, the outer ring of the slewing support bearing is fixedly connected to the bogie, and the inner ring of the slewing support bearing is fixedly connected to the load-bearing wheel cover.

[0007] In some embodiments, the drive assembly includes a telescopic drive member and a drive arm; one end of the telescopic drive member is fixedly connected to the bogie, and the other end is hinged to the drive arm; one end of the drive arm is hinged to the bogie, and the other end is hinged to the inner ring of the bearing; the telescopic drive member is used to drive the drive arm to swing so that the inner ring of the bearing rotates relative to the outer ring of the bearing.

[0008] For example, the drive arm includes a first swing arm and a second swing arm; wherein, one end of the first swing arm is hinged to the bogie, and the other end bends and extends away from the telescopic drive member and is hinged to one end of the second swing arm, and the bent portion of the first swing arm is hinged to the output end of the telescopic drive member; the other end of the second swing arm is hinged to the inner ring of the bearing.

[0009] For example, the top of the load-bearing wheel cover is provided with a flange, which is fixedly connected to the inner ring of the bearing. The flange has a fixed shaft that passes upward through the inner ring of the bearing. The fixed shaft is offset from the rotation center of the inner ring of the bearing and is hinged to the second swing arm.

[0010] In one possible implementation, rotating drive components are symmetrically installed on both sides of the load-bearing wheel cover, and the output end of each rotating drive component is connected to a walking wheel.

[0011] In some embodiments, the rotary drive includes a hydraulic motor and a wheel-side reducer; the wheel-side reducer is fixedly connected to the side wall of the load-bearing wheel cover, the hydraulic motor is fixedly connected to the power input end of the wheel-side reducer, and the traveling wheel is fixedly connected to the power output end of the wheel-side reducer.

[0012] For example, a brake valve is connected to the hydraulic motor.

[0013] In some embodiments, the bogie has a circumferentially closed cavity in which both drive components are located.

[0014] The advantages of the steering system provided by this utility model are as follows: Compared with the prior art, the steering system of this utility model has two steering mechanisms installed at both ends of the frame. The two steering wheel groups of each steering mechanism can rotate independently under the drive of one of the drive components. Therefore, the swing direction of the two steering wheel groups can be the same or opposite. Thus, when one steering mechanism maintains its initial state and the two steering wheel groups of the other steering mechanism swing in the same direction at a certain angle, the accelerated loading test equipment can perform conventional steering actions. When the steering wheel groups of the two steering mechanisms swing in the same direction at the same angle, the accelerated loading test equipment can perform overall oblique or lateral position transfer. When the steering wheel groups of the two steering mechanisms swing in opposite directions and the two steering wheel groups on the same steering mechanism swing in the same direction, the two steering mechanisms form a figure-eight shape, thereby reducing the turning radius of the accelerated loading test equipment. When the two steering wheel groups of the two steering mechanisms swing in the same direction to form a figure-eight shape, the accelerated loading test equipment can perform on-the-spot turning, further reducing the turning radius. It can eliminate the constraint of the test site area on the position transfer of the accelerated loading test equipment, and can flexibly select the steering mode according to the actual situation, thereby improving the position transfer flexibility and adaptability of the accelerated loading test equipment to the test site.

[0015] Secondly, this utility model embodiment also provides an accelerated loading test equipment, including the above-mentioned steering system.

[0016] The beneficial effects of the accelerated loading test equipment provided by this utility model are as follows: Compared with the prior art, the accelerated loading test equipment of this utility model adopts the above-mentioned steering system, which can reduce the turning radius, eliminate the restriction of the test site area on the position transfer of the accelerated loading test equipment, and flexibly select the steering mode according to the actual situation, thereby improving its position transfer flexibility and adaptability to the test site. Attached Figure Description

[0017] Figure 1 A three-dimensional structural schematic diagram of one of the steering mechanisms of the steering system provided in an embodiment of this utility model;

[0018] Figure 2 This is a front view schematic diagram of the steering mechanism used in the embodiment of this utility model;

[0019] Figure 3 This is a three-dimensional structural diagram of the steering wheel assembly used in an embodiment of this utility model;

[0020] Figure 4 This is a schematic diagram of the main structure of the driving component used in the embodiment of this utility model;

[0021] Figure 5 A schematic diagram of the steering mode of the steering system provided in an embodiment of this utility model.

[0022] In the diagram: 10. Steering mechanism; 11. Bogie; 12. Steering wheel assembly; 121. Load-bearing wheel cover; 1211. Flange; 1212. Fixed shaft; 122. Traveling wheel; 123. Rotary drive component; 1231. Hydraulic motor; 1232. Wheel-side reducer; 1233. Brake valve; 13. Drive assembly; 131. Telescopic drive component; 132. Drive arm; 1321. First swing arm; 1322. Second swing arm; 14. Slewing support bearing; 141. Bearing outer ring; 142. Bearing inner ring. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] It should be noted that when an element is referred to as being "set on" or "connected to" another element, it can be directly on or indirectly on the other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0025] Please refer to the following: Figures 1 to 5 The steering system provided by this utility model will now be described. The steering system includes two steering mechanisms 10 respectively located at both ends of the frame of the acceleration loading test equipment; the steering mechanism 10 includes a bogie 11, two steering wheel sets 12, and two drive components 13; the bogie 11 is connected to the frame, and the two steering wheel sets 12 are rotatably connected to both ends of the bogie 11; the two drive components 13 are both located on the bogie 11 and their output ends are respectively connected to the two steering wheel sets 12, and the two drive components 13 are used to drive the two steering wheel sets 12 to swing in the same direction or in opposite directions; wherein, when the two steering wheel sets 12 swing in opposite directions, the acceleration loading test equipment turns in place.

[0026] It should be noted that accelerated loading test equipment typically has a relatively large length. In this embodiment, the two steering mechanisms 10 are respectively located at both ends of the frame's length. In this embodiment, each steering wheel assembly 12 has a power source to drive itself to rotate and roll on the ground; that is, each steering wheel assembly 12 is self-propelled. The specific power source can be a geared motor or a hydraulic motor 1231. In this embodiment, each end of the bogie 11 is rotatably connected to a steering wheel assembly 12, thereby enabling the frame to have four walking support points distributed in a rectangular array. The connection between the frame and the bogie 11 can be a sliding connection. When the accelerated loading test equipment needs to be moved, the frame is lifted by a driving component such as a hydraulic lifting cylinder. During the accelerated loading test, the frame is lowered so that it is directly supported on the ground, thereby relieving the load on the steering mechanism 10.

[0027] The steering system provided in this embodiment can offer at least the following steering modes:

[0028] 1. Conventional semi-figure-eight turn, such as Figure 5 As shown in Figure a, in one steering mechanism 10, the two steering wheel sets 12 deflect in the same direction, while in the other steering mechanism 10, the two steering wheel sets 12 do not deflect. At this time, the overall rotation center of the frame is located on the extension line of the wheel axle of the undeflected steering wheel set 12. This situation requires a larger turning radius.

[0029] II. Lateral movement, such as Figure 5 As shown in Figure b, the two steering wheel groups 12 of the two steering mechanisms 10 swing in the same direction by 90 degrees, which allows the frame to change from longitudinal movement to lateral movement.

[0030] III. The entire eight characters indicate a change in direction, such as... Figure 5 As shown in the figure, the two steering wheel sets 12 of the two steering mechanisms 10 deflect in the same direction, but the steering wheel sets 12 of the two steering mechanisms 10 deflect in opposite directions, thus making the two steering mechanisms 10 form a figure-eight shape. At this time, the rotation center of the frame is located on the extension line of the symmetrical center line of the two bogies 11, and the turning radius is smaller than that of conventional half figure-eight steering.

[0031] IV. Diagonal, such as Figure 5 As shown in the diagram, similar to the lateral movement mode, but in the diagonal movement mode, the swing angle of each steering wheel group 12 is less than 90 degrees. At this time, the overall movement direction of the frame can be tilted at a certain angle to its own long axis direction.

[0032] 5. Turn in place, such as Figure 5 As shown in the diagram, the two steering wheel sets 12 of the two steering mechanisms 10 are both deflected in the direction. At this time, the rotation center coincides with the geometric center of the frame, which enables the entire accelerated loading test equipment to rotate around the geometric center of the frame as the origin. In this mode, the turning radius is the smallest.

[0033] Compared with the prior art, the steering system provided in this embodiment has two steering mechanisms 10 installed at both ends of the frame. The two steering wheel groups 12 of each steering mechanism 10 can rotate independently under the drive of one of the drive components 13. Therefore, the swing direction of the two steering wheel groups 12 can be the same or opposite. Thus, the steering mode can be flexibly selected according to the actual situation. When using the full figure-eight steering and stationary steering modes, the turning radius can be greatly reduced, thereby eliminating the constraint of the test site area on the position transfer of the accelerated loading device. This can improve the position transfer flexibility of the accelerated loading test equipment and its adaptability to the test site.

[0034] In some embodiments, see Figure 2 and Figure 3The steering wheel assembly 12 includes a load-bearing wheel cover 121, a traveling wheel 122 rotatably connected to the load-bearing wheel cover 121, and a rotary drive component 123 disposed on the load-bearing wheel cover 121 and used to drive the traveling wheel 122 to roll on the ground; the bogie 11 is provided with a slewing support bearing 14, the outer ring 141 of the slewing support bearing 14 is fixedly connected to the bogie 11, and the inner ring 142 of the slewing support bearing 14 is fixedly connected to the load-bearing wheel cover 121.

[0035] The main function of the load-bearing wheel cover 121 is to provide load-bearing and force transmission. The weight of the main body of the equipment is transferred to the two bogies 11 through the frame, and then to the load-bearing wheel cover 121 through the bogies 11, and finally to the ground through the bogie wheel assembly 12. Therefore, the load-bearing wheel cover 121 needs to have sufficient structural strength. Specifically, it can be formed by welding thick steel plates and welding reinforcing ribs on the cover. The rotary drive component 123 can be an electric component or a hydraulic power component. Considering the heavy weight of the equipment and the low travel speed, a hydraulic power component such as a hydraulic motor 1231 is preferred as the rotary drive component 123. The rotary drive component 123 drives the traveling wheels 122 to roll on the ground to realize the movement of the equipment. The slewing support bearing 14 is a large bearing that can withstand large radial loads, axial loads and overturning moments. The use of the slewing support bearing 14 to connect the load-bearing wheel cover 121 to the bogies 11 can improve the rotational stability of the load-bearing wheel cover 121 relative to the bogies 11.

[0036] As one specific implementation of the aforementioned driving component 13, please refer to Figure 4 The drive assembly 13 includes a telescopic drive member 131 and a drive arm 132; one end of the telescopic drive member 131 is fixedly connected to the bogie 11, and the other end is hinged to the drive arm 132; one end of the drive arm 132 is hinged to the bogie 11, and the other end is hinged to the inner ring 142 of the bearing; the telescopic drive member 131 is used to drive the drive arm 132 to swing so that the inner ring 142 of the bearing rotates relative to the outer ring 141 of the bearing.

[0037] The telescopic drive component 131 can be an electric push rod or a hydraulic cylinder. A hydraulic cylinder is preferred to improve the stability of the driving force and power output. When the telescopic drive component 131 changes length based on the telescopic action, the drive arm 132 can swing under the drive of the telescopic drive component 131, thereby causing the inner ring 142 of the bearing to rotate relative to the outer ring 141 of the bearing. Since the load-bearing wheel cover 121 is connected to the inner ring 142 of the bearing, it can drive the load-bearing wheel cover 121 to rotate synchronously with the inner ring 142 of the bearing, thereby realizing the swing of the steering wheel assembly 12. The structure is stable and reliable.

[0038] Specifically, such as Figure 4As shown, the drive arm 132 includes a first swing arm 1321 and a second swing arm 1322. One end of the first swing arm 1321 is hinged to the bogie 11, and the other end bends and extends away from the telescopic drive member 131 and is hinged to one end of the second swing arm 1322. The bent portion of the first swing arm 1321 is hinged to the output end of the telescopic drive member 131. The other end of the second swing arm 1322 is hinged to the inner ring of the bearing 142. If the drive arm 132 is an integral structure, the range of rotation angles of the inner ring of the bearing 142 will be limited. Here, by using the first swing arm 1321 and the second swing arm 1322, which are hinged to each other, as the drive arm 132, the swing angle of the first swing arm 1321 can be amplified by the second swing arm 1322, thereby driving the inner ring of the bearing 142 to obtain a larger rotation angle. Specifically, in this embodiment, the inner ring of the bearing 142 can drive the steering wheel assembly 12 to achieve a steering angle of ±100°.

[0039] For some possible implementations, please refer to [link / reference]. Figure 3 and Figure 4 The top of the load-bearing wheel cover 121 is provided with a flange 1211, which is fixedly connected to the bearing inner ring 142. The flange 1211 has a fixed shaft 1212 that passes upward through the bearing inner ring 142. The fixed shaft 1212 is offset from the rotation center of the bearing inner ring 142 and is hinged to the second swing arm 1322. By connecting the flange 1211 to the bearing inner ring 142, a ring of fasteners can be arranged axially along the bearing inner ring 142 and connected to the flange 1211, thereby improving the connection strength. At the same time, the edge of the flange 1211 can support the underside of the bearing inner ring 142, thereby improving the vertical load-bearing capacity and the support stability of the load-bearing wheel cover 121 on the bogie 11. The fixed shaft 1212 eccentrically arranged on the flange 1211 serves as the connection point for hinged connection with the second swing arm 1322. The force of the second swing arm 1322 can be transmitted to the flange 1211 through the fixed shaft 1212, and then to the bearing inner ring 142 through the flange 1211. This avoids stress concentration caused by direct force on the bearing inner ring 142, which is beneficial to improving the service life of the slewing bearing 14.

[0040] It should be noted that, as Figure 2 As shown, rotating drive members 123 are symmetrically installed on both sides of the load-bearing wheel cover 121, and the output end of each rotating drive member 123 is connected to a traveling wheel 122. By setting two rotating drive members 123 on the support and each driving a traveling wheel 122 to rotate, not only can the driving force be improved, but the contact area between each steering wheel assembly 12 and the ground can also be increased, thereby improving the load capacity of the steering wheel assembly 12.

[0041] Optionally, the structure of the rotary drive 123 in this embodiment is as follows: Figure 3As shown, the rotary drive 123 includes a hydraulic motor 1231 and a wheel-side reducer 1232; the wheel-side reducer 1232 is fixedly connected to the side wall of the load-bearing wheel cover 121, the hydraulic motor 1231 is fixedly connected to the power input end of the wheel-side reducer 1232, and the traveling wheel 122 is fixedly connected to the power output end of the wheel-side reducer 1232.

[0042] The function of the wheel-side reducer 1232 is to reduce speed and increase torque, thereby increasing the torque transmitted from the hydraulic motor 1231 to the traveling wheel 122, thus improving the driving force. The wheel-side reducer 1232 is directly fixed to the load-bearing wheel cover 121, and then the hydraulic motor 1231 is connected to the wheel-side reducer 1232 or the load-bearing wheel cover 121, and the output section of the hydraulic motor 1231 is connected to the power input end of the wheel-side reducer 1232. The hub of the traveling wheel 122 can be directly fixedly connected to the connecting plate of the power output end of the wheel-side reducer 1232. The structure is simple and compact.

[0043] It should be noted that, see Figure 3 In this embodiment, a brake valve 1233 is connected to the hydraulic motor 1231. By setting the brake valve 1233, service braking can be achieved. That is, during driving, the oil supply to the hydraulic motor 1231 can be cut off by the brake valve 1233 to automatically stop the vehicle. Since the equipment is heavy and travels at a low speed, there is no need to set up a separate dedicated brake. Of course, considering parking stability, a normally closed parking brake can also be installed on the wheel-side reducer 1232, and the oil circuit of the normally closed parking brake can be controlled by the parking brake valve. When parking, cutting off the oil allows the parking brake to brake the wheel-side reducer 1232 under the action of spring force. When driving, opening the parking brake valve allows oil to flow to the parking brake, thereby disengaging the parking brake and allowing the wheel-side reducer 1232 to operate normally. This improves the stability of the parking state and prevents the vehicle from rolling away.

[0044] For examples, please refer to Figure 1 The bogie 11 has a circumferentially enclosed cavity, and both drive assemblies 13 are located within the cavity. Specifically, the bogie 11 can be a rectangular frame structure that encloses the cavity. The placement of the two drive assemblies 13 within the cavity can improve the structural compactness of the steering mechanism 10 and reduce its weight, while also providing safety protection for the drive assemblies 13.

[0045] Based on the same inventive concept, combined with Figures 1 to 5 It is understood that this application embodiment also provides an accelerated loading test equipment, including the above-described steering system.

[0046] Compared with the prior art, the accelerated loading test equipment provided in this embodiment can reduce the turning radius and eliminate the constraints of the test site area on the position transfer of the accelerated loading test equipment due to the adoption of the above-mentioned steering system. The steering mode can be flexibly selected according to the actual situation, thereby improving its position transfer flexibility and adaptability to the test site.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A steering system characterized by, The steering system comprises two steering mechanisms arranged at two ends of a rack of an acceleration loading test equipment respectively; the steering mechanism comprises a steering frame, two steering wheel groups and two driving assemblies; The steering frame is connected with the rack, and the two steering wheel groups are rotatably connected with two ends of the steering frame respectively; the two driving assemblies are arranged on the steering frame and have output ends connected with the two steering wheel groups respectively, and the two driving assemblies are used for driving the two steering wheel groups to swing in the same direction or in opposite directions; when the two steering wheel groups swing in opposite directions, the acceleration loading test equipment turns in place.

2. The steering system of claim 1, wherein, The steering wheel group comprises a load wheel cover, a walking wheel rotatably connected with the load wheel cover, and a rotary driving member arranged on the load wheel cover and used for driving the walking wheel to roll on the ground; a slewing support bearing is arranged on the steering frame, a bearing outer ring of the slewing support bearing is fixedly connected with the steering frame, and a bearing inner ring of the slewing support bearing is fixedly connected with the load wheel cover.

3. The steering system of claim 2, wherein, The driving assembly comprises a telescopic driving member and a driving arm; one end of the telescopic driving member is fixedly connected with the steering frame, and the other end is hingedly connected with the driving arm; one end of the driving arm is hingedly connected with the steering frame, and the other end is hingedly connected with the bearing inner ring; the telescopic driving member is used for driving the driving arm to swing so that the bearing inner ring rotates relative to the bearing outer ring.

4. The steering system of claim 3, wherein, The driving arm comprises a first swing arm and a second swing arm; one end of the first swing arm is hingedly connected with the steering frame, the other end extends towards a direction away from the telescopic driving member and is hingedly connected with one end of the second swing arm, and a bending part of the first swing arm is hingedly connected with an output end of the telescopic driving member; the other end of the second swing arm is hingedly connected with the bearing inner ring.

5. The steering system of claim 4, wherein, A flange plate is arranged on a top of the load wheel cover, the flange plate is fixedly connected with the bearing inner ring, and the flange plate has a fixed shaft penetrating upwards through the bearing inner ring, the fixed shaft deviates from a slewing center of the bearing inner ring and is hingedly connected with the second swing arm.

6. The steering system of claim 5, wherein, The rotary driving members are symmetrically arranged on two sides of the load wheel cover, and the walking wheels are connected with output ends of the rotary driving members.

7. The steering system of claim 6, wherein, The rotary driving member comprises a hydraulic motor and a wheel-side reducer; the wheel-side reducer is fixedly connected with a side wall of the load wheel cover, the hydraulic motor is fixedly connected with a power input end of the wheel-side reducer, and the walking wheel is fixedly connected with a power output end of the wheel-side reducer.

8. The steering system of claim 7, wherein, A brake valve is connected with the hydraulic motor.

9. A steering system according to any one of claims 1 to 8, wherein, The steering frame has a circumferentially closed cavity, and the two driving assemblies are arranged in the cavity.

10. Accelerated loading test equipment, characterized in that, The steering system comprises the steering system according to any one of claims 1-9.

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