Anti-rollover device and control method for concrete mixer truck

Abstract

The present invention discloses a rollover prevention device and control method for a concrete mixer truck. The rollover prevention device is mounted on the chassis of the concrete mixer truck and supports the truck's mixing system and hydraulic system. The device comprises a load-bearing plate, an adjustment module, a locking module, a sensing module, an on-off valve, a safety valve, a three-position, four-way solenoid valve, a two-position, three-way solenoid valve, and a control module. By adjusting the position of the load-bearing plate, the present invention further improves the operating safety of the concrete mixer truck.

Description

Technical Field

[0001] The present invention relates to the field of automobile rollover prevention, and in particular to a rollover prevention device and a control method for a concrete mixer truck. Background Art

[0002] Concrete mixer trucks have a high center of gravity and poor driving stability. The vehicle itself is required to stir while driving. Especially when it is fully loaded, the concrete in the mixing barrel keeps turning over, causing the center of gravity of the entire vehicle to constantly change, causing eccentric vibration, and there is a risk of rollover accidents during driving.

[0003] Liang Peng and others designed a rollover prevention system for a concrete mixer truck (Patent No. 202221468585.6). The system includes a steering wheel angle sensor, a gravity sensor, an onboard controller, an air compressor, an air reservoir, a height control valve, and an air suspension. The gravity sensor detects changes in axle load, while the steering wheel angle sensor detects changes in steering wheel angle, direction, and angular velocity to adjust the air suspension's rise and fall, ensuring that axle loads remain within a certain range and that no axle load drops to zero, causing a rollover. However, this system fails to take into account the complex nature of the concrete mixer truck, the complex installation requirements of the mixing drum, and the limited axle load adjustment range of the system.

[0004] Zhao Tianyu and others designed a rollover-resistant concrete mixer truck (patent number 201821341314.8). This device consists of a front end, tank casing, cement tank, and support rods. When the concrete truck tilts, the support rods rotate around the rotating seat under the action of gravity, maintaining a vertical downward position. When the concrete truck tilts to a certain degree, the support rods can support the ground, thus supporting the tank casing and preventing it from toppling. Although the device will not fall over after a rollover, it cannot immediately resume driving, and the support rods may not be very effective on inclined and curved roads.

[0005] He Shaowei and others designed an improved concrete mixer truck (patent number 201721689257.8). The anti-rollover subframe of this device consists of a front subframe and a rear subframe. A slide is provided on the right side of the front subframe, and a roller is provided on the left side of the rear subframe. The front subframe is fixed to the bottom of the rear subframe by bolts, and the roller of the rear subframe is fixed to the slide of the front subframe. The height offset fixation of the rear and front subframes can lower the center of mass of the mixer truck. The front and rear subframes are fixedly connected by bolts. The relative slip generated by the semi-rigid connection of the bolts solves the problem of torsional torque transmission, thereby preventing the torsional torque of the front and rear subframes from being too large and causing torsional deformation, solving the problem of the mixer truck being prone to rollover. However, this device still has the possibility of rollover when encountering turns and slopes.

[0006] Yu Junyu et al. designed a rollover-resistant concrete mixer truck (Patent No. 201720432670.X). This device features a rollover-resistant wheel consisting of a hub, tires, and several adjustment levers for adjusting the wheel diameter. When the truck turns, the height difference between the two wheels causes the truck to tilt in the direction of the turn. The component of the truck's gravity in the tilting direction bears some of the centripetal force, reducing the likelihood of the truck rolling over during turns. However, this device fails to account for rollover accidents that can occur when driving in a straight line. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide an anti-rollover device and a control method for a concrete mixer truck in view of the defects involved in the background technology.

[0008] The present invention adopts the following technical solutions to solve the above technical problems:

[0009] A rollover prevention device for a concrete mixer truck is installed on the chassis of the concrete mixer truck and carries the mixing system and hydraulic system of the concrete mixer truck. It includes a bearing plate, an adjustment module, a locking module, a sensing module, a switch valve, a safety valve, a three-position four-way solenoid valve, a two-position three-way solenoid valve and a control module.

[0010] The load-bearing plate is rectangular and is arranged on the chassis of the concrete mixer truck through an adjustment module. Its length direction is parallel to the body direction of the concrete mixer truck and is used to carry the mixing system and hydraulic system of the concrete mixer truck.

[0011] The adjustment module includes a double-piston-rod hydraulic cylinder, first and second guide plates, first and second roller groups, first and second roller groups, and first and second baffles;

[0012] The double-piston-rod hydraulic cylinder is fixed at the center of the lower end surface of the load-bearing plate, and the piston rods at both ends are coaxial and perpendicular to the length direction of the load-bearing plate;

[0013] The first guide plate and the second guide plate are symmetrically arranged on both sides of the double-piston-rod hydraulic cylinder, are both vertically fixed to the lower end surface of the bearing plate, and are both parallel to the piston rods at both ends of the double-piston-rod hydraulic cylinder;

[0014] The first to second roller groups, the first to second roller groups, and the first to second baffles are all arranged on the chassis of the concrete mixer truck;

[0015] The first roller group and the second roller group each comprise n freely rotatable rollers fixed to the chassis of the concrete mixer truck via brackets, where n is a natural number greater than or equal to 2. The axes of the n rollers in the first roller group are collinear and evenly spaced; the axes of the n rollers in the second roller group are collinear and evenly spaced. The first roller group and the second roller group are symmetrically arranged at both ends of a double-piston-rod hydraulic cylinder, with the axes of the rollers therein perpendicular to the piston rods at both ends of the double-piston-rod hydraulic cylinder.

[0016] The first roller group and the second roller group each include m rollers having rotating shafts vertically fixed to the chassis of the concrete mixer truck, where m is a natural number greater than or equal to 2, wherein the rotating shafts of the m rollers in the first roller group are coplanar and evenly spaced; the rotating shafts of the m rollers in the second roller group are coplanar and evenly spaced; the outer walls of the m rollers in the first roller group are in contact with a side of the first guide plate away from the second guide plate, and the outer walls of the m rollers in the second roller group are in contact with a side of the second guide plate away from the first guide plate;

[0017] The first baffle and the second baffle are both vertically fixed to the chassis of the concrete mixer truck and symmetrically arranged at both ends of the double-piston-rod hydraulic cylinder, and the first baffle and the second baffle are both perpendicular to the piston rods at both ends of the double-piston-rod hydraulic cylinder;

[0018] The load-bearing plate frame is on the first roller group and the second roller group, and abuts against the cylindrical surfaces of each roller in the first roller group and the second roller group. A gap is left between the lower ends of the first guide plate and the second guide plate and the chassis of the concrete mixer truck, and a gap is left between the upper ends of the first baffle plate and the second baffle plate and the load-bearing plate, so that the double-piston-rod hydraulic cylinder can apply force to the first baffle plate and the second baffle plate to make the load-bearing plate freely roll relative to the first roller group and the second roller group in a direction perpendicular to the body of the concrete mixer truck;

[0019] The locking module includes a first locking unit and a second locking unit;

[0020] The first locking unit and the second locking unit have the same structure, and both include a cylinder, a slider, q return springs, and q power cylinders, where q is a natural number greater than or equal to 1;

[0021] The cylinder body is a column with one end open and the other end closed, and the closed end is provided with q mounting holes corresponding to the power cylinders one by one;

[0022] The slider is a column that matches the inner wall of the cylinder, is arranged in the cylinder, and is connected to the cylinder in a closed sliding manner. It can slide freely in the cylinder, and a friction layer is provided on the side of the slider away from the closed section of the cylinder.

[0023] The power cylinder is a power cylinder with one end open and the other end closed; the q open ends of the power cylinder and the q mounting holes at the closed end of the cylinder body are vertically and tightly connected one by one;

[0024] The q return springs are arranged in q power cylinders in a one-to-one correspondence; one end of the return spring is fixedly connected to the closed end of its corresponding power cylinder, and the other end is fixedly connected to the slider, in a stretched state;

[0025] A hydraulic inlet is provided at the center of the closed end of the power cylinder;

[0026] The first locking unit and the second locking unit are symmetrically arranged on both sides of the double-piston-rod hydraulic cylinder, and the cylinder body is fixedly connected to the chassis of the concrete mixer truck. The first locking unit is used to press the friction layer on the slider against the first guide plate when hydraulic pressure is injected, thereby locking the load-bearing plate and the chassis of the concrete mixer truck. The second locking unit is used to press the friction layer on the slider against the second guide plate when hydraulic pressure is injected, thereby locking the load-bearing plate and the chassis of the concrete mixer truck.

[0027] The P port of the switch valve is connected to the hydraulic pump outlet of the hydraulic system of the concrete mixer truck through an oil pipe, and the A port is connected to the P port of the two-position three-way solenoid valve through an oil pipe;

[0028] The P port of the three-position four-way solenoid valve is connected to the hydraulic pump outlet and the inlet of the safety valve of the hydraulic system of the concrete mixer truck through oil pipes, the T port is connected to the oil tank inlet of the hydraulic system of the concrete mixer truck through the oil pipe, the A port is connected to the chamber on one side of the double-piston-rod hydraulic cylinder through the oil pipe, and the B port is connected to the chamber on the other side of the double-piston-rod hydraulic cylinder through the oil pipe;

[0029] The P port of the two-position three-way solenoid valve is connected to the A port of the switch valve through an oil pipe, the T port is connected to the oil tank inlet of the hydraulic system of the concrete mixer truck and the outlet of the safety valve through oil pipes, and the A port is connected to the hydraulic inlet on each power cylinder in the first locking unit and the second locking unit through oil pipes;

[0030] The sensing module includes a first pressure gauge, a second pressure gauge, a flow meter, a first pressure sensor, a second pressure sensor, a first vehicle height sensor, and a second vehicle height sensor;

[0031] The first pressure gauge is provided on the oil pipe between the B port of the three-position four-way solenoid valve and the double-piston-rod hydraulic cylinder, and is used to measure the hydraulic pressure at the location and transmit it to the control module;

[0032] The second pressure gauge is provided on the oil pipe between port A of the three-position four-way solenoid valve and the double-piston-rod hydraulic cylinder, and is used to measure the hydraulic pressure there and transmit it to the control module;

[0033] The flow meter is provided at the outlet of the safety valve, and is used to measure the flow rate thereat and transmit it to the control module;

[0034] The first pressure sensor and the second pressure sensor are respectively arranged on the frame at the left rear wheel and the right rear wheel of the concrete mixer truck, and are used to measure the load of the rear axle of the concrete mixer truck at the left rear wheel and the right rear wheel and transmit it to the control module;

[0035] The first vehicle height sensor and the second vehicle height sensor are respectively arranged on the frame at the left rear wheel and the right rear wheel of the concrete mixer truck, and are used to measure the change in height of the left rear suspension and the right rear suspension of the concrete mixer truck relative to a preset height threshold and transmit the change to the control module;

[0036] The control module is electrically connected to the first pressure gauge, the second pressure gauge, the flow meter, the first pressure sensor, the second pressure sensor, the first vehicle height sensor, the second vehicle height sensor, the three-position four-way solenoid valve, the two-position three-way solenoid valve, and the switch valve, respectively, and is used to control the three-position four-way solenoid valve, the two-position three-way solenoid valve, and the switch valve according to the sensing signals of the first pressure gauge, the second pressure gauge, the flow meter, the first pressure sensor, the second pressure sensor, the first vehicle height sensor, and the second vehicle height sensor.

[0037] The present invention also discloses a control method for the anti-rollover device of the concrete mixer truck, comprising the following steps:

[0038] The first baffle is positioned on the left side of the concrete mixer truck relative to the second baffle, the first roller group is positioned on the left side of the concrete mixer truck relative to the second roller group, the first guide plate is positioned on the front side of the concrete mixer truck relative to the second guide plate, and port A of the three-position four-way solenoid valve is connected to the chamber on the left side of the double-piston-rod hydraulic cylinder;

[0039] The hydraulic system of the concrete mixer truck is in the activated state when the vehicle is running;

[0040] Step 1), the control module controls the solenoid coil of the switch valve to be energized;

[0041] Step 2), the control module collects the flow meter signal. If the flow meter signal is not 0, the control module controls the switch valve solenoid coil to cut off the power; if the flow meter signal is 0, jump to and re-execute step 2);

[0042] In step 3, the control module collects signals from the first vehicle height sensor and the second vehicle height sensor, obtains the height change of the left rear suspension and the right rear suspension of the concrete mixer truck relative to a preset height threshold, and calculates the absolute value LP of the difference. If LP is greater than or equal to the preset safety threshold LA, step 4 is executed; if LP is less than the preset safety threshold LA, the process jumps to step 3 again.

[0043] Step 4), the control module collects signals from the first pressure sensor and the second pressure sensor, obtains the load of the rear axle of the concrete mixer truck at the left rear wheel and the load at the right rear wheel, and compares the load at the left rear wheel and the load at the right rear wheel:

[0044] Step 4.1): If the load on the left rear wheel is greater than the load on the right rear wheel, the control module controls the left solenoid coil of the three-position four-way solenoid valve to be energized, and the process jumps to step 5.

[0045] Step 4.2): If the load on the left rear wheel is less than the load on the right rear wheel, the control module controls the right solenoid coil of the three-position four-way solenoid valve to be energized, and the process jumps to step 6.

[0046] Step 5), the control module collects the second pressure gauge signal PA, and if PA is less than or equal to the preset pressure threshold P, re-execute step 5); if PA is greater than the preset pressure threshold P, the solenoid coil of the two-position three-way solenoid valve is energized;

[0047] Step 6), the control module collects the first pressure gauge signal PB, and if PB is less than or equal to the preset pressure threshold P, re-execute step 6); if PB is greater than the preset pressure threshold P, the solenoid coil of the two-position three-way solenoid valve is energized;

[0048] In step 7), the control module collects signals from the first pressure sensor and the second pressure sensor to obtain the load on the left rear wheel and the load on the right rear wheel of the rear axle of the concrete mixer truck. If the load on the left rear wheel is not equal to the load on the right rear wheel, the process proceeds to step 7 again. If the load on the left rear wheel is equal to the load on the right rear wheel, the control module controls the solenoid coil of the three-position four-way solenoid valve to be de-energized, controls the solenoid coil of the two-position three-way solenoid valve to be de-energized, and jumps to step 1).

[0049] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects:

[0050] 1. Good compatibility: The installation layout of the mixing system and hydraulic system of a concrete mixer truck requires many technical considerations. The present invention does not modify the installation layout on the load plate, but only installs an anti-rollover device between the bottom of the load plate and the chassis.

[0051] 2. Good power source: The power source of the device comes from the concrete mixer truck's own hydraulic system, so there is no need to design a separate power source. The hydraulic system of the concrete mixer truck is an important device in the concrete mixer truck and has sufficient power source.

[0052] 3. Precise Control: The ECU collects signals from the first and second pressure sensors, as well as the first and second vehicle height sensors, to precisely control the concrete mixer truck's center of gravity, ensuring it remains essentially constant from the vehicle's longitudinal centerline.

[0053] 4. High Safety: Due to the high center of gravity of concrete mixer trucks, a slight adjustment of the load plate is all that is needed to prevent rollovers. The locking module also prevents the load plate from accidentally sliding, thereby preventing collisions with passing vehicles and people. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a structural diagram of an anti-rollover device for a concrete mixer truck according to the present invention.

[0055] Figure 2 The present invention is a structural diagram of the entire vehicle layout of an anti-rollover device for a concrete mixer truck.

[0056] Figure 3 The present invention is a structural diagram of the arrangement of the bearing plate of the anti-rollover device of a concrete mixer truck.

[0057] Figure 4 The present invention is a flow chart of a method for controlling an anti-rollover device of a concrete mixer truck.

[0058] In the figure, 1-carrying plate, 2-second roller group, 3-second guide plate, 4-second locking unit, 5-second roller group, 6-double-piston rod hydraulic cylinder, 7-first pressure gauge, 8-first locking unit, 9-first guide plate, 10-first roller group, 11-control module, 12-first roller group, 13-second pressure gauge, 14-three-position four-way solenoid valve, 15-two-position three-way solenoid valve, 16-flow meter, 17-safety valve, 18-switch valve. DETAILED DESCRIPTION

[0059] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings:

[0060] The present invention can be implemented in many different forms and should not be considered to be limited to the embodiments described herein. On the contrary, these embodiments are provided to make this disclosure thorough and complete and will fully convey the scope of the invention to those skilled in the art. In the accompanying drawings, components are enlarged for clarity.

[0061] It should be understood that although the terms first, second, third, etc. may be used herein to describe various elements, components, and / or parts, these elements, components, and / or parts are not limited by these terms. These terms are merely used to distinguish elements, components, and / or parts from each other. Therefore, the first element, component, and / or part discussed below can become the second element, component, or part without departing from the teachings of the present invention.

[0062] like Figure 1 、 Figure 2 、 Figure 3As shown, the present invention discloses an anti-rollover device for a concrete mixer truck, which is arranged on the chassis of the concrete mixer truck and carries the mixing system and hydraulic system of the concrete mixer truck, including a carrying plate, an adjustment module, a locking module, a sensing module, a switch valve, a safety valve, a three-position four-way solenoid valve, a two-position three-way solenoid valve and a control module;

[0063] The load-bearing plate is rectangular and is arranged on the chassis of the concrete mixer truck through an adjustment module. Its length direction is parallel to the body direction of the concrete mixer truck and is used to carry the mixing system and hydraulic system of the concrete mixer truck.

[0064] The adjustment module includes a double-piston-rod hydraulic cylinder, first and second guide plates, first and second roller groups, first and second roller groups, and first and second baffles;

[0065] The double-piston-rod hydraulic cylinder is fixed at the center of the lower end surface of the load-bearing plate, and the piston rods at both ends are coaxial and perpendicular to the length direction of the load-bearing plate;

[0066] The first guide plate and the second guide plate are symmetrically arranged on both sides of the double-piston-rod hydraulic cylinder, are both vertically fixed to the lower end surface of the bearing plate, and are both parallel to the piston rods at both ends of the double-piston-rod hydraulic cylinder;

[0067] The first to second roller groups, the first to second roller groups, and the first to second baffles are all arranged on the chassis of the concrete mixer truck;

[0068] The first roller group and the second roller group each comprise n freely rotatable rollers fixed to the chassis of the concrete mixer truck via brackets, where n is a natural number greater than or equal to 2. The axes of the n rollers in the first roller group are collinear and evenly spaced; the axes of the n rollers in the second roller group are collinear and evenly spaced. The first roller group and the second roller group are symmetrically arranged at both ends of a double-piston-rod hydraulic cylinder, with the axes of the rollers therein perpendicular to the piston rods at both ends of the double-piston-rod hydraulic cylinder.

[0069] The first roller group and the second roller group each include m rollers having rotating shafts vertically fixed to the chassis of the concrete mixer truck, where m is a natural number greater than or equal to 2, wherein the rotating shafts of the m rollers in the first roller group are coplanar and evenly spaced; the rotating shafts of the m rollers in the second roller group are coplanar and evenly spaced; the outer walls of the m rollers in the first roller group are in contact with a side of the first guide plate away from the second guide plate, and the outer walls of the m rollers in the second roller group are in contact with a side of the second guide plate away from the first guide plate;

[0070] The first baffle and the second baffle are both vertically fixed to the chassis of the concrete mixer truck and symmetrically arranged at both ends of the double-piston-rod hydraulic cylinder, and the first baffle and the second baffle are both perpendicular to the piston rods at both ends of the double-piston-rod hydraulic cylinder;

[0071] The load-bearing plate frame is on the first roller group and the second roller group, and abuts against the cylindrical surfaces of each roller in the first roller group and the second roller group. A gap is left between the lower ends of the first guide plate and the second guide plate and the chassis of the concrete mixer truck, and a gap is left between the upper ends of the first baffle plate and the second baffle plate and the load-bearing plate, so that the double-piston-rod hydraulic cylinder can apply force to the first baffle plate and the second baffle plate to make the load-bearing plate freely roll relative to the first roller group and the second roller group in a direction perpendicular to the body of the concrete mixer truck;

[0072] The locking module includes a first locking unit and a second locking unit;

[0073] The first locking unit and the second locking unit have the same structure, and both include a cylinder, a slider, q return springs, and q power cylinders, where q is a natural number greater than or equal to 1;

[0074] The cylinder body is a column with one end open and the other end closed, and the closed end is provided with q mounting holes corresponding to the power cylinders one by one;

[0075] The slider is a column that matches the inner wall of the cylinder, is arranged in the cylinder, and is connected to the cylinder in a closed sliding manner. It can slide freely in the cylinder, and a friction layer is provided on the side of the slider away from the closed section of the cylinder.

[0076] The power cylinder is a power cylinder with one end open and the other end closed; the q open ends of the power cylinder and the q mounting holes at the closed end of the cylinder body are vertically and tightly connected one by one;

[0077] The q return springs are arranged in q power cylinders in a one-to-one correspondence; one end of the return spring is fixedly connected to the closed end of its corresponding power cylinder, and the other end is fixedly connected to the slider, in a stretched state;

[0078] A hydraulic inlet is provided at the center of the closed end of the power cylinder;

[0079] The first locking unit and the second locking unit are symmetrically arranged on both sides of the double-piston-rod hydraulic cylinder, and the cylinder body is fixedly connected to the chassis of the concrete mixer truck. The first locking unit is used to press the friction layer on the slider against the first guide plate when hydraulic pressure is injected, thereby locking the load-bearing plate and the chassis of the concrete mixer truck. The second locking unit is used to press the friction layer on the slider against the second guide plate when hydraulic pressure is injected, thereby locking the load-bearing plate and the chassis of the concrete mixer truck.

[0080] The P port of the switch valve is connected to the hydraulic pump outlet of the hydraulic system of the concrete mixer truck through an oil pipe, and the A port is connected to the P port of the two-position three-way solenoid valve through an oil pipe;

[0081] The P port of the three-position four-way solenoid valve is connected to the hydraulic pump outlet and the inlet of the safety valve of the hydraulic system of the concrete mixer truck through oil pipes, the T port is connected to the oil tank inlet of the hydraulic system of the concrete mixer truck through the oil pipe, the A port is connected to the chamber on one side of the double-piston-rod hydraulic cylinder through the oil pipe, and the B port is connected to the chamber on the other side of the double-piston-rod hydraulic cylinder through the oil pipe;

[0082] The P port of the two-position three-way solenoid valve is connected to the A port of the switch valve through an oil pipe, the T port is connected to the oil tank inlet of the hydraulic system of the concrete mixer truck and the outlet of the safety valve through oil pipes, and the A port is connected to the hydraulic inlet on each power cylinder in the first locking unit and the second locking unit through oil pipes;

[0083] The sensing module includes a first pressure gauge, a second pressure gauge, a flow meter, a first pressure sensor, a second pressure sensor, a first vehicle height sensor, and a second vehicle height sensor;

[0084] The first pressure gauge is provided on the oil pipe between the B port of the three-position four-way solenoid valve and the double-piston-rod hydraulic cylinder, and is used to measure the hydraulic pressure at the location and transmit it to the control module;

[0085] The second pressure gauge is provided on the oil pipe between port A of the three-position four-way solenoid valve and the double-piston-rod hydraulic cylinder, and is used to measure the hydraulic pressure there and transmit it to the control module;

[0086] The flow meter is provided at the outlet of the safety valve, and is used to measure the flow rate thereat and transmit it to the control module;

[0087] The first pressure sensor and the second pressure sensor are respectively arranged on the frame at the left rear wheel and the right rear wheel of the concrete mixer truck, and are used to measure the load of the rear axle of the concrete mixer truck at the left rear wheel and the right rear wheel and transmit it to the control module;

[0088] The first vehicle height sensor and the second vehicle height sensor are respectively arranged on the frame at the left rear wheel and the right rear wheel of the concrete mixer truck, and are used to measure the change in height of the left rear suspension and the right rear suspension of the concrete mixer truck relative to a preset height threshold and transmit the change to the control module;

[0089] The control module is electrically connected to the first pressure gauge, the second pressure gauge, the flow meter, the first pressure sensor, the second pressure sensor, the first vehicle height sensor, the second vehicle height sensor, the three-position four-way solenoid valve, the two-position three-way solenoid valve, and the switch valve, respectively, and is used to control the three-position four-way solenoid valve, the two-position three-way solenoid valve, and the switch valve according to the sensing signals of the first pressure gauge, the second pressure gauge, the flow meter, the first pressure sensor, the second pressure sensor, the first vehicle height sensor, and the second vehicle height sensor.

[0090] like Figure 4 As shown, the present invention also discloses a control method for the anti-rollover device of the concrete mixer truck, comprising the following steps:

[0091] The first baffle is positioned on the left side of the concrete mixer truck relative to the second baffle, the first roller group is positioned on the left side of the concrete mixer truck relative to the second roller group, the first guide plate is positioned on the front side of the concrete mixer truck relative to the second guide plate, and port A of the three-position four-way solenoid valve is connected to the chamber on the left side of the double-piston-rod hydraulic cylinder;

[0092] The hydraulic system of the concrete mixer truck is in the activated state when the vehicle is running;

[0093] Step 1), the control module controls the solenoid coil of the switch valve to be energized.

[0094] Step 2), the control module collects the flow meter signal. If the flow meter signal is not 0, the control module controls the switch valve solenoid coil to cut off the power; if the flow meter signal is 0, jump to re-execute step 2).

[0095] The solenoid coil of the switch valve is energized to open, causing the locking unit to lock. Since the equipment installed on the carrier plate is heavy, the locking unit is required to fix the carrier plate when it does not move left or right.

[0096] In step 3, the control module collects signals from the first vehicle height sensor and the second vehicle height sensor, obtains the height change of the left rear suspension and the right rear suspension of the concrete mixer truck relative to the preset height threshold, and calculates the absolute value LP of the difference. If LP is greater than or equal to the preset safety threshold LA, execute step 4); if LP is less than the preset safety threshold LA, jump to and execute step 3 again.

[0097] Since minor changes in the center of gravity don't cause rollover, a vehicle height sensor is required to measure the change in height of the left and right suspensions relative to a preset height threshold. Experiments determine that when the absolute difference in the height difference between the left and right suspensions reaches a certain value, a rollover is imminent. A safety threshold, LA, is set based on this value. When the absolute difference in the height difference between the left and right suspensions relative to the preset height threshold is greater than or equal to the safety threshold, the load plate needs to be moved left or right to adjust the center of gravity and prevent rollover.

[0098] Step 4), the control module collects signals from the first pressure sensor and the second pressure sensor, obtains the load of the rear axle of the concrete mixer truck at the left rear wheel and the load at the right rear wheel, and compares the load at the left rear wheel and the load at the right rear wheel:

[0099] Step 4.1): If the load on the left rear wheel is greater than the load on the right rear wheel, the control module controls the left solenoid coil of the three-position four-way solenoid valve to be energized, and the process jumps to step 5.

[0100] Step 4.2): If the load on the left rear wheel is less than the load on the right rear wheel, the control module controls the right solenoid coil of the three-position four-way solenoid valve to be energized, and the process jumps to step 6.

[0101] Step 5), the control module collects the second pressure gauge signal PA, and if PA is less than or equal to the preset pressure threshold P, re-execute step 5); if PA is greater than the preset pressure threshold P, the solenoid coil of the two-position three-way solenoid valve is energized;

[0102] Step 6), the control module collects the first pressure gauge signal PB, and if PB is less than or equal to the preset pressure threshold P, re-execute step 6); if PB is greater than the preset pressure threshold P, the solenoid coil of the two-position three-way solenoid valve is energized;

[0103] If a rollover to the left is about to occur, the center of gravity is biased to the left, and the left load is greater than the right load. The control module controls the left electromagnetic coil of the three-position four-way solenoid valve to be energized, that is, pressurizing the left chamber of the double-piston-rod hydraulic cylinder, so that the load-bearing plate moves to the right. Similarly, if a rollover to the right is about to occur, the center of gravity is biased to the right, and the left load is less than the right load. The control module controls the right electromagnetic coil of the three-position four-way solenoid valve to be energized, that is, pressurizing the right chamber of the double-piston-rod hydraulic cylinder, so that the load-bearing plate moves to the left. At this moment, the locking device still fixes the load-bearing plate to prevent insufficient pressure in the chamber of the double-piston-rod hydraulic cylinder, which causes the load-bearing plate to move in the opposite direction and cause rollover. Therefore, a pressure gauge is required to measure whether the hydraulic pressure in the chamber reaches the threshold value P obtained from the experiment. When the chamber pressure reaches the threshold value P, the locking unit is released, and the load-bearing plate can move left and right.

[0104] When the chamber pressure reaches the threshold value P, the control module controls the solenoid coil of the two-position three-way solenoid valve to be energized, that is, the locking unit is released and the carrier plate can move left and right.

[0105] In step 7), the control module collects signals from the first pressure sensor and the second pressure sensor to obtain the load on the left rear wheel and the load on the right rear wheel of the rear axle of the concrete mixer truck. If the load on the left rear wheel is not equal to the load on the right rear wheel, the process proceeds to step 7 again. If the load on the left rear wheel is equal to the load on the right rear wheel, the control module controls the solenoid coil of the three-position four-way solenoid valve to be de-energized, controls the solenoid coil of the two-position three-way solenoid valve to be de-energized, and jumps to step 1).

[0106] The left load is equal to the right load, that is, the center of gravity is on the center line. The control module controls the solenoid coil of the three-position four-way solenoid valve to cut off the power, that is, the load plate does not need to move anymore, and the locking unit needs to work to fix the load plate.

[0107] In this way, in a scenario where the concrete mixer truck without the device of the present invention is not installed and will not overturn, the load-bearing plate in the present invention is directly above the chassis; if the concrete mixer truck without the device of the present invention is installed and will overturn, the load-bearing plate moves left and right to avoid overturning, and when the truck leaves the scenario, the load-bearing plate will also move directly above the chassis.

[0108] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art in the art to which this invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and, unless defined as such, will not be interpreted in an idealized or overly formal sense.

[0109] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rollover prevention device for a concrete mixer truck, which is installed on the chassis of the concrete mixer truck and carries the mixing system and hydraulic system of the concrete mixer truck, and is characterized in that: It includes a load-bearing plate, an adjustment module, a locking module, a sensing module, a switch valve, a safety valve, a three-position four-way solenoid valve, a two-position three-way solenoid valve and a control module; The load-bearing plate is rectangular and is arranged on the chassis of the concrete mixer truck through an adjustment module. Its length direction is parallel to the body direction of the concrete mixer truck and is used to carry the mixing system and hydraulic system of the concrete mixer truck. The adjustment module includes a double-piston-rod hydraulic cylinder, first and second guide plates, first and second roller groups, first and second roller groups, and first and second baffles; The double-piston-rod hydraulic cylinder is fixed at the center of the lower end surface of the load-bearing plate, and the piston rods at both ends are coaxial and perpendicular to the length direction of the load-bearing plate; The first guide plate and the second guide plate are symmetrically arranged on both sides of the double-piston-rod hydraulic cylinder, are both vertically fixed to the lower end surface of the bearing plate, and are both parallel to the piston rods at both ends of the double-piston-rod hydraulic cylinder; The first to second roller groups, the first to second roller groups, and the first to second baffles are all arranged on the chassis of the concrete mixer truck; The first roller group and the second roller group each comprise n freely rotatable rollers fixed to the chassis of the concrete mixer truck via brackets, where n is a natural number greater than or equal to 2. The axes of the n rollers in the first roller group are collinear and evenly spaced; the axes of the n rollers in the second roller group are collinear and evenly spaced. The first roller group and the second roller group are symmetrically arranged at both ends of a double-piston-rod hydraulic cylinder, with the axes of the rollers therein being perpendicular to the piston rods at both ends of the double-piston-rod hydraulic cylinder. The first roller group and the second roller group each include m rollers having rotating shafts vertically fixed to the chassis of the concrete mixer truck, where m is a natural number greater than or equal to 2, wherein the rotating shafts of the m rollers in the first roller group are coplanar and evenly spaced; the rotating shafts of the m rollers in the second roller group are coplanar and evenly spaced; the outer walls of the m rollers in the first roller group are in contact with a side of the first guide plate away from the second guide plate, and the outer walls of the m rollers in the second roller group are in contact with a side of the second guide plate away from the first guide plate; The first baffle and the second baffle are both vertically fixed to the chassis of the concrete mixer truck and symmetrically arranged at both ends of the double-piston-rod hydraulic cylinder, and the first baffle and the second baffle are both perpendicular to the piston rods at both ends of the double-piston-rod hydraulic cylinder; The load-bearing plate frame is on the first roller group and the second roller group, and abuts against the cylindrical surfaces of each roller in the first roller group and the second roller group. A gap is left between the lower ends of the first guide plate and the second guide plate and the chassis of the concrete mixer truck, and a gap is left between the upper ends of the first baffle plate and the second baffle plate and the load-bearing plate, so that the double-piston-rod hydraulic cylinder can apply force to the first baffle plate and the second baffle plate to make the load-bearing plate freely roll relative to the first roller group and the second roller group in a direction perpendicular to the body of the concrete mixer truck; The locking module includes a first locking unit and a second locking unit; The first locking unit and the second locking unit have the same structure, and both include a cylinder, a slider, q return springs, and q power cylinders, where q is a natural number greater than or equal to 1; The cylinder body is a column with one end open and the other end closed, and the closed end is provided with q mounting holes corresponding to the power cylinders one by one; The slider is a column that matches the inner wall of the cylinder, is arranged in the cylinder, and is connected to the cylinder in a closed sliding manner. It can slide freely in the cylinder, and a friction layer is provided on the side of the slider away from the closed section of the cylinder. The power cylinder is a power cylinder with one end open and the other end closed; the q open ends of the power cylinder and the q mounting holes at the closed end of the cylinder body are vertically and tightly connected one by one; The q return springs are arranged in q power cylinders in a one-to-one correspondence; one end of the return spring is fixedly connected to the closed end of its corresponding power cylinder, and the other end is fixedly connected to the slider, in a stretched state; A hydraulic inlet is provided at the center of the closed end of the power cylinder; The first locking unit and the second locking unit are symmetrically arranged on both sides of the double-piston-rod hydraulic cylinder, and the cylinder body is fixedly connected to the chassis of the concrete mixer truck. The first locking unit is used to press the friction layer on the slider against the first guide plate when hydraulic pressure is injected, thereby locking the load-bearing plate and the chassis of the concrete mixer truck. The second locking unit is used to press the friction layer on the slider against the second guide plate when hydraulic pressure is injected, thereby locking the load-bearing plate and the chassis of the concrete mixer truck. The P port of the switch valve is connected to the hydraulic pump outlet of the hydraulic system of the concrete mixer truck through an oil pipe, and the A port is connected to the P port of the two-position three-way solenoid valve through an oil pipe; The P port of the three-position four-way solenoid valve is connected to the hydraulic pump outlet and the inlet of the safety valve of the hydraulic system of the concrete mixer truck through oil pipes, the T port is connected to the oil tank inlet of the hydraulic system of the concrete mixer truck through the oil pipe, the A port is connected to the chamber on one side of the double-piston-rod hydraulic cylinder through the oil pipe, and the B port is connected to the chamber on the other side of the double-piston-rod hydraulic cylinder through the oil pipe; The P port of the two-position three-way solenoid valve is connected to the A port of the switch valve through an oil pipe, the T port is connected to the oil tank inlet of the hydraulic system of the concrete mixer truck and the outlet of the safety valve through oil pipes, and the A port is connected to the hydraulic inlet on each power cylinder in the first locking unit and the second locking unit through oil pipes; The sensing module includes a first pressure gauge, a second pressure gauge, a flow meter, a first pressure sensor, a second pressure sensor, a first vehicle height sensor, and a second vehicle height sensor; The first pressure gauge is provided on the oil pipe between the B port of the three-position four-way solenoid valve and the double-piston-rod hydraulic cylinder, and is used to measure the hydraulic pressure at the location and transmit it to the control module; The second pressure gauge is provided on the oil pipe between port A of the three-position four-way solenoid valve and the double-piston-rod hydraulic cylinder, and is used to measure the hydraulic pressure there and transmit it to the control module; The flow meter is arranged at the outlet of the safety valve, and is used to measure the flow at the outlet and transmit the flow to the control module; The first pressure sensor and the second pressure sensor are respectively arranged on the frame at the left rear wheel and the right rear wheel of the concrete mixer truck, and are used to measure the load of the rear axle of the concrete mixer truck at the left rear wheel and the right rear wheel and transmit it to the control module; The first vehicle height sensor and the second vehicle height sensor are respectively arranged on the frame at the left rear wheel and the right rear wheel of the concrete mixer truck, and are used to measure the change in height of the left rear suspension and the right rear suspension of the concrete mixer truck relative to a preset height threshold and transmit the change to the control module; The control module is electrically connected to the first pressure gauge, the second pressure gauge, the flow meter, the first pressure sensor, the second pressure sensor, the first vehicle height sensor, the second vehicle height sensor, the three-position four-way solenoid valve, the two-position three-way solenoid valve, and the switch valve, respectively, and is used to control the three-position four-way solenoid valve, the two-position three-way solenoid valve, and the switch valve according to the sensing signals of the first pressure gauge, the second pressure gauge, the flow meter, the first pressure sensor, the second pressure sensor, the first vehicle height sensor, and the second vehicle height sensor.

2. The control method of the anti-rollover device of the concrete mixer truck according to claim 1 is characterized in that: The following steps are involved: The first baffle is positioned on the left side of the concrete mixer truck relative to the second baffle, the first roller group is positioned on the left side of the concrete mixer truck relative to the second roller group, the first guide plate is positioned on the front side of the concrete mixer truck relative to the second guide plate, and port A of the three-position four-way solenoid valve is connected to the chamber on the left side of the double-piston-rod hydraulic cylinder; The hydraulic system of the concrete mixer truck is in the activated state when the vehicle is running; Step 1), the control module controls the solenoid coil of the switch valve to be energized; Step 2), the control module collects the flow meter signal. If the flow meter signal is not 0, the control module controls the switch valve solenoid coil to cut off the power; if the flow meter signal is 0, jump to and re-execute step 2); In step 3, the control module collects signals from the first vehicle height sensor and the second vehicle height sensor, obtains the height change of the left rear suspension and the right rear suspension of the concrete mixer truck relative to a preset height threshold, and calculates the absolute value LP of the difference. If LP is greater than or equal to the preset safety threshold LA, step 4 is executed; if LP is less than the preset safety threshold LA, the process jumps to step 3 again. Step 4), the control module collects signals from the first pressure sensor and the second pressure sensor, obtains the load of the rear axle of the concrete mixer truck at the left rear wheel and the load at the right rear wheel, and compares the load at the left rear wheel and the load at the right rear wheel: Step 4.1): If the load on the left rear wheel is greater than the load on the right rear wheel, the control module controls the left solenoid coil of the three-position four-way solenoid valve to be energized, and the process jumps to step 5. Step 4.2): If the load on the left rear wheel is less than the load on the right rear wheel, the control module controls the right solenoid coil of the three-position four-way solenoid valve to be energized, and the process jumps to step 6. Step 5), the control module collects the second pressure gauge signal PA, and if PA is less than or equal to the preset pressure threshold P, re-execute step 5); if PA is greater than the preset pressure threshold P, the solenoid coil of the two-position three-way solenoid valve is energized; Step 6), the control module collects the first pressure gauge signal PB, and if PB is less than or equal to the preset pressure threshold P, step 6 is executed again); If PB is greater than the preset pressure threshold P, the solenoid coil of the two-position three-way solenoid valve is energized; In step 7), the control module collects signals from the first pressure sensor and the second pressure sensor to obtain the load on the left rear wheel and the load on the right rear wheel of the rear axle of the concrete mixer truck. If the load on the left rear wheel is not equal to the load on the right rear wheel, the process proceeds to step 7 again. If the load on the left rear wheel is equal to the load on the right rear wheel, the control module controls the solenoid coil of the three-position four-way solenoid valve to be de-energized, controls the solenoid coil of the two-position three-way solenoid valve to be de-energized, and jumps to step 1).

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