A wheeled vehicle passability in-situ test simulation device

Abstract

The purpose of the present invention is to overcome the shortcomings of the prior art and provide a wheeled vehicle passability evaluation test device, which can realize low-cost, high-efficiency, and repeatable vehicle passability tests under various working conditions, including a press, a wheel loading system, a soil trough, and a metering system; the press is connected to the wheel loading system and is used to apply pressure to the wheel loading system; the soil trough can contain sand and soil; the wheel loading system can be set on the sand and soil and is used to simulate tire driving under the action of the press; the metering system is used to measure the soil pressure values ​​at different depths when the wheel loading system is simulated. The pressure value and displacement of the press actuator are recorded.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle passability evaluation and relates to an in-situ test simulation device for the passability of a wheeled vehicle. Background Art

[0002] Vehicle passability generally refers to the ability of a vehicle to travel on uneven roads and soft soils, and generally refers to the road support passability. The main task of vehicle support passability research is to use theoretical analysis and experimental methods to explore the working characteristics and load conditions of various vehicles under different soil conditions, so as to improve vehicle performance, and develop mathematical models and equations based on the relationship between soil characteristics, loads and vehicle parameters to determine the vehicle design parameters and ideal design solutions. The ground factors that affect vehicle passability mainly include soil pressure characteristics, shear characteristics and load characteristics.

[0003] At present, vehicle passability assessment usually adopts numerical simulation combined with on-site in-situ test verification analysis methods. Due to the complexity of rock and soil, simple numerical simulation results must be combined with in-situ test verification to obtain reliable analysis results. Therefore, in-situ tests play an indispensable role in data support in vehicle passability assessment analysis.

[0004] However, current in-situ vehicle passability tests are expensive, difficult to organize, have poor repeatability, and have high randomness in the data, making it difficult to conduct tests on a variety of different operating conditions. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide an in-situ test simulation device for the passability of a wheeled vehicle, which can realize low-cost, high-efficiency, repeatable tests of the passability of a vehicle under various working conditions.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: an in-situ test simulation device for the passability of a wheeled vehicle, comprising a press, a wheel loading system, a soil trough and a metering system;

[0007] The press is connected to the wheel loading system and is used to apply pressure to the wheel loading system;

[0008] The soil trough can contain sand and soil;

[0009] The wheel loading system can be arranged on the sand to simulate tire driving under the action of a press;

[0010] The metering system is used to measure the soil pressure values ​​at different depths when the wheel loading system is in simulated operation, and to record the pressure value and displacement of the press actuator.

[0011] Further, the metering system includes a plurality of pressure sensors and a press machine private service system;

[0012] The pressure sensors are buried at different depths in the sand of the soil trough to collect the pressure values ​​of the sand at different depths;

[0013] The press private server system is used to record the pressure value and displacement of the press actuator.

[0014] Further, the wheel loading system includes a steel inner wheel hub, a rubber outer tire, a wheel axle, and a press actuator connection mechanism;

[0015] The rubber outer tire is tightly fitted on the outer ring of the inner wheel hub, and the wheel axle passes through the center of the steel inner wheel hub;

[0016] The press actuator connection mechanism comprises a connection plate with a connection hole and an axle connection member fixedly connected to the middle portion of the connection plate;

[0017] The connecting plate is connected to the actuator of the press through connecting holes and bolts;

[0018] The wheel axle connecting member is two fixing plates arranged in parallel, and mounting holes are arranged at corresponding positions of the two fixing plates; the wheel axle connecting member is connected to the wheel axle through the mounting holes and nuts.

[0019] The above settings achieve the following effects: the rubber outer tire and axle of the wheel loading system are close to the wheels of real wheeled vehicles, and the simulation effect is good. The press actuator connection mechanism is tightly and rigidly connected to the press actuator through bolts, ensuring the effective transmission of the load applied by the press and the accuracy of the measured value of the actuator displacement.

[0020] Furthermore, the soil trough is made of steel, including a bottom plate and four side plates, and the bottom plate and the side plates are connected with screws.

[0021] The above setting achieves the following effects: the bottom plate and four side plates of the steel soil trough are fastened together with screws, which can effectively withstand soil pressure and press pressure, thereby improving the test effect.

[0022] Furthermore, water of different water levels can be added to the soil trough; a rubber pad is laid on the surface of the bottom plate, reinforcing screws are provided on the upper part of the side plate to fasten the side plate, and a rubber sealing strip can be installed on the contact surface of the side plate to prevent water leakage.

[0023] The above settings achieve the following effects: rubber pads are installed, and rubber anti-seepage strips are installed at the contact surface of the steel plate to prevent water leakage. Water can be injected into the soil trough to simulate the working condition of a water-containing foundation.

[0024] Furthermore, a road panel placed on the upper surface of the sand can be arranged in the soil trough;

[0025] The metering system also includes a strain gauge arranged on the lower surface of the road slab and an under-slab earth pressure gauge arranged below the road slab.

[0026] Furthermore, the evaluation method of the wheeled vehicle passability in-situ test simulation device comprises the following steps:

[0027] Step 1: Simulate the actual foundation. Lay sand in the soil trough according to the actual proportion of foundation soil, and pour water according to the actual groundwater level.

[0028] Step 2: Bury pressure sensors. Bury pressure sensors at different depths in the soil trench to measure soil pressure values.

[0029] Step 3: Assembly of wheel pressurizing system. Use a steel inner wheel hub with a rubber tire to simulate a wheeled vehicle tire. Use a steel axle to pass through the steel inner wheel hub, fix the simulated tire on the steel bracket, and use a nut to connect it to the press actuator connection mechanism.

[0030] Step 4: Apply pressure and record. Use a press to apply pressure. The pressure value and displacement of the press actuator are automatically recorded by the press private server system, and the pressure value in the soil is recorded by the pressure sensor buried in the soil. The pressure value of the press actuator reflects the tire pressure, the displacement of the press actuator reflects the tire settlement, and the pressure value in the soil reflects the pressure value at different depths in the soil.

[0031] Furthermore, the method further comprises:

[0032] Prepare multiple sets of soil trenches to simulate actual foundations;

[0033] Spray the curing agent in different soil troughs and leave them for different periods of time;

[0034] Pressure is applied in different soil tanks and recorded by a metering system.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The present invention can realistically simulate the bearing pressure of foundation soil on wheeled vehicles, and can simulate many foundation soil conditions, including various soil types and whether there is groundwater.

[0037] 2. The test data of the present invention has a wide range: including the settlement of foundation soil and soil pressure at different burial depths. With different presses, it can simulate many types of loads: static load, low-frequency cyclic dynamic load, long-term load, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0039] Figure 1 It is the overall structural schematic diagram of the present invention:

[0040] Figure 2 The wheel loading system of the present invention;

[0041] Figure 3 It is the soil trough of the present invention.

[0042] In the figure: 1. press; 2. wheel loading system; 21. inner wheel hub; 22. outer tire; 23. axle; 24. press actuator connection mechanism; 241. connecting plate; 242. fixing plate; 3. soil trough; 31. soil body; 32. road panel; 33. soil pressure gauge under the panel; 34. strain gauge. DETAILED DESCRIPTION

[0043] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0044] Embodiment 1:

[0045] This embodiment provides a wheeled vehicle passability in-situ test simulation device, such as Figure 1 As shown, it includes a press 1, a wheel loading system 2, a soil trough 3 and a metering system; the press 1 is connected to the wheel loading system 2 and is used to apply pressure to the wheel loading system 2; the soil trough 3 can be filled with sand and soil; the wheel loading system 2 can be set on the sand and soil, and is used to simulate tire driving under the action of the press 1; the metering system is used to measure the pressure values ​​of the soil 31 at different depths when the wheel loading system 2 simulates operation, and record the pressure value and displacement of the actuator of the press 1.

[0046] The metering system includes multiple pressure sensors and a press private server system; the pressure sensors are buried at different depths in the sand of the soil trough 3 to collect sand pressure values ​​at different depths; the press private server system is used to record the pressure value and displacement of the actuator of the press 1.

[0047] like Figure 2 As shown, the wheel loading system 2 includes a steel inner wheel hub 21, a rubber outer tire 22, an axle 23, and a press 1 actuator connection mechanism; the rubber outer tire 22 fits tightly to the outer ring of the inner wheel hub 21, and the axle 23 passes through the center of the steel inner wheel hub 21; the press 1 actuator connection mechanism includes a connecting plate 241 with a connecting hole and a wheel axle connector fixedly connected to the middle of the connecting plate 241.

[0048] The connecting plate 241 is connected to the actuator of the press 1 through connecting holes and bolts; the wheel axle connecting member is two parallel fixed plates 242, and the two fixed plates 242 are provided with mounting holes at corresponding positions; the wheel axle connecting member is connected to the wheel axle 23 through mounting holes and nuts.

[0049] The rubber outer tire 22 and the wheel axle 23 of the wheel loading system 2 are close to the wheels of a real wheeled vehicle, and the simulation effect is good. The actuator connection mechanism of the press 1 is tightly and rigidly connected to the actuator of the press 1 through bolts, ensuring the effective transmission of the load applied by the press 1 and the accuracy of the measured value of the actuator displacement.

[0050] The wheel loading system 2 includes a steel inner wheel hub 21, a rubber outer tire 22, an axle 23, and a press 1 actuator connection mechanism. The rubber outer tire 22 fits tightly on the outer ring of the inner wheel hub 21. The axle 23 passes through the center of the steel inner wheel hub 21. The press 1 actuator connection mechanism is connected to the axle 23 through a nut, and the rectangular steel plate at the top of the actuator connection mechanism is connected to the actuator of the press 1 with four bolts.

[0051] The soil trough 3 is made of steel and consists of a bottom plate and four side plates. The bottom plate and the side plates are connected by screws. A rubber pad can be laid on the surface of the bottom plate to prevent water leakage. The upper part of the side plate has reinforcing screws to fasten the side plate. The contact surface of the side plate can be equipped with a rubber sealing strip to prevent water leakage.

[0052] Among them, soil 31 is placed in the soil trough 3 according to the working conditions, and water at different water levels can be added according to the working conditions. A steel-core rubber wheel is placed in the center of the upper surface of the soil 31, and the wheel is connected to the hydraulic press head. An axial load is applied to the wheel through the hydraulic press. The load acts on the soil 31, and the settlement time-history curve of the soil 31 can be measured through the displacement meter on the hydraulic head. At different burial depths of the soil 31, soil pressure sensors are buried to measure the soil pressure values ​​of the soil 31 at different depths. The tire pressure, the settlement of the soil 31, and the soil pressure values ​​at different burial depths of the foundation can be used to correct the calculation model and determine the tire passability.

[0053] The rubber outer tire 22 and axle 23 of the wheel loading system 2 are close to the wheels of a real wheeled vehicle, and the simulation effect is good. The actuator connection mechanism of the press 1 is tightly and rigidly connected to the actuator of the press 1 through bolts, ensuring the effective transmission of the load applied by the press 1 and the accuracy of the displacement meter measurement of the actuator. The bottom plate and the four side plates of the steel soil trough 3 are fastened with screws, and rubber anti-seepage strips are installed at the contact surface of the steel plate. Water can be injected into the soil trough 3 to simulate the working conditions of the water-containing foundation.

[0054] Compared with the prior art, the beneficial effects achieved by the present invention are: it can realistically simulate the bearing pressure of the foundation soil on the wheeled vehicle, and can simulate a variety of foundation soil body 31 working conditions, and can realistically simulate various types of soil bodies 31 and whether there is groundwater. The test data range is wide: including the settlement of the foundation soil and the soil pressure at different burial depths. In conjunction with different presses 1, it can simulate a variety of load types: static load, low-frequency cyclic dynamic load, long-term load, etc.

[0055] In the actual implementation process, the specific steps include:

[0056] Step 1: Simulate the actual foundation. Lay sand in the soil trough 3 according to the actual proportion of the foundation soil, and pour water according to the actual groundwater level;

[0057] Step 2: Bury pressure sensors. Bury pressure sensors at different depths in the soil trench 3 to measure soil pressure values;

[0058] Step 3: Assemble the wheel pressurizing system. Use a steel inner wheel hub 21 with a rubber tire to simulate a wheeled vehicle tire. Use a steel wheel axle 23 to pass through the steel inner wheel hub 21, fix the simulated tire on the steel bracket, and use a nut to connect it to the actuator connection mechanism of the press 1;

[0059] Step 4: Apply pressure and record. Use press 1 to apply pressure. The pressure value and displacement of the actuator of press 1 are automatically recorded by the press private server system, and the pressure value in the soil is recorded by the pressure sensor buried in the soil. The pressure value of the actuator of press 1 reflects the tire pressure, the displacement of the actuator of press 1 reflects the tire settlement, and the pressure value in the soil reflects the pressure value at different depths in the soil.

[0060] A road panel 32 placed on the upper surface of the sand can also be arranged in the soil trough 3 ; the metering system also includes a strain gauge 34 arranged on the lower surface of the road panel 32 and an under-plate soil pressure gauge 33 arranged below the road panel 32 .

[0061] The present invention can not only be used for vehicle passability test, but also can be used to test the implementation effect of sand solidifying agent. The specific operation steps are as follows:

[0062] Step 1: Prepare multiple sets of soil trenches 3 to simulate the actual foundation. Lay sand in the soil trenches 3 according to the actual proportion of foundation soil, and pour water according to the actual groundwater level.

[0063] Step 2: Bury pressure sensors. Bury pressure sensors at different depths in the soil trench 3 to measure soil pressure values.

[0064] Step 3: Assembling the wheel pressurizing system. Use a steel inner wheel hub 21 with a rubber tire to simulate a wheeled vehicle tire. Use a steel wheel axle 23 to pass through the steel inner wheel hub 21, fix the simulated tire on the steel bracket, and use a nut to connect it to the actuator connection mechanism of the press 1.

[0065] Step 4: spray different doses or types of curing agents in different soil troughs 3 and place them for different periods of time;

[0066] Step 5: Apply pressure in different soil grooves 3 and record it. Use press 1 to apply pressure. The pressure value and displacement of the actuator of press 1 are automatically recorded by the press private server system, and the pressure value in the soil is recorded by the pressure sensor buried in the soil. The pressure value of the actuator of press 1 reflects the tire pressure, the displacement of the actuator of press 1 reflects the tire settlement, and the pressure value in the soil reflects the pressure value at different depths in the soil. Match different curing agents with tire pressure and tire settlement to obtain the implementation effect of different curing agents.

[0067] After the test is completed, the solidified soil should be removed in time and the curing agent residue should be cleaned up, and new sand and soil should be filled in to prevent the curing agent residue from interfering with the next test results.

[0068] In addition, during the test, attention should be paid to using the controlled variable method and only changing one influence variable of the curing agent at a time.

[0069] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features, and in the description of the present invention, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0070] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0073] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A wheeled vehicle passability in-situ test simulation device, characterized in that: Includes press, wheel loading system, soil trough and metering system; The press is connected to the wheel loading system and is used to apply pressure to the wheel loading system; The soil trough can contain sand and soil; The wheel loading system can be arranged on the sand to simulate tire driving under the action of a press; The metering system is used to measure the soil pressure values ​​at different depths during the simulated operation of the wheel loading system, and to record the pressure value and displacement of the press actuator; The metering system includes a plurality of pressure sensors and a press service system; The pressure sensors are buried at different depths in the sand of the soil trough to collect the pressure values ​​of the sand at different depths; The press private server system is used to record the pressure value and displacement of the press actuator; The evaluation method of the wheeled vehicle passability in-situ test simulation device comprises the following steps: Lay sand in the soil trough according to the actual proportion of foundation soil, and pour water according to the actual height of the groundwater level; Pressure sensors are buried at different depths of the soil trench; Install the wheel loading system on the press and adjust the wheel loading system to just above the sand in the soil trough; The pressure is applied by the press, and the pressure value and displacement of the press actuator are recorded by the press private server system, and the pressure value in the soil is recorded by the pressure sensor buried in the soil; The testing method of the wheeled vehicle passability in-situ test simulation device includes testing the implementation effect of the sand solidifying agent, and the operating steps are: Step 1: Prepare multiple sets of soil trenches to simulate the actual foundation; lay sand in the soil trenches according to the actual proportion of foundation soil, and pour water according to the actual groundwater level; Step 2: burying pressure sensors; burying pressure sensors at different depths in the soil trench to measure soil pressure values; Step 3: Assemble the wheel pressurizing system; use a steel inner wheel hub with a rubber tire to simulate a wheeled vehicle tire; use a steel wheel axle to pass through the steel inner wheel hub, fix the simulated tire on the steel bracket, and use a nut to connect it to the press actuator connection mechanism; Step 4: Spray different doses or types of curing agents in different soil troughs and place them for different periods of time; Step 5: Apply pressure in different soil grooves and record it; use a press to apply pressure, the pressure value and displacement of the press actuator are automatically recorded by the press private service system, and the pressure value in the soil is recorded by the pressure sensor buried in the soil; the pressure value of the press actuator reflects the tire pressure, the displacement of the press actuator reflects the tire settlement, and the pressure value in the soil reflects the pressure values ​​at different depths in the soil; match different curing agents with tire pressure and tire settlement to obtain the implementation effects of different curing agents; After the test is completed, the solidified soil should be removed in time and the curing agent residue should be cleaned up, and new sand and soil should be filled in to prevent the curing agent residue from interfering with the next test results.

2. The wheeled vehicle passability in-situ test simulation device according to claim 1, characterized in that: The wheel loading system includes a steel inner wheel hub, a rubber outer tire, a wheel axle, and a press actuator connection mechanism; The rubber outer tire is tightly fitted on the outer ring of the inner wheel hub, and the wheel axle passes through the center of the steel inner wheel hub; The press actuator connection mechanism comprises a connection plate with a connection hole and an axle connection member fixedly connected to the middle portion of the connection plate; The connecting plate is connected to the actuator of the press through connecting holes and bolts; The wheel axle connecting member is two fixing plates arranged in parallel, and mounting holes are arranged at corresponding positions of the two fixing plates; the wheel axle connecting member is connected to the wheel axle through the mounting holes and nuts.

3. The wheeled vehicle passability in-situ test simulation device according to claim 1, characterized in that: The soil trough is made of steel and comprises a bottom plate and four side plates, and the bottom plate and the side plates are connected with screws.

4. The wheeled vehicle passability in-situ test simulation device according to claim 3, characterized in that: The soil trough can also be filled with water at different water levels; the surface of the bottom plate is paved with a rubber pad, the upper part of the side plate is provided with reinforcing screws for fastening the side plate, and the contact surface of the side plate can be equipped with a rubber sealing strip to prevent leakage.

5. The wheeled vehicle passability in-situ test simulation device according to claim 3, characterized in that: The soil trough can also be provided with a road panel placed on the upper surface of the sand; The metering system also includes a strain gauge arranged on the lower surface of the road slab and an under-slab earth pressure gauge arranged below the road slab.

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