A 3D paving system based on liquid leveling

Abstract

The present invention discloses a 3D paving system based on liquid leveling, which includes a paver, a 3D paving control module electrically connected to the paver, and a liquid leveling module. The paver elevation information is obtained in real time through the liquid leveling module, and the elevation information is sent to the 3D paving control module. After obtaining the elevation information, the 3D paving control module generates a paving instruction corresponding to the paver, and uses the pressure balance principle of the liquid to perform elevation transmission. It has strong anti-interference in signal transmission and also has greater advantages in economic benefits.

Description

Technical Field

[0001] The present invention relates to the field of 3D paving technology, and in particular to a 3D paving system based on liquid leveling. Background Art

[0002] In the 1970s, my country began to develop asphalt mixture paver products. In order to master and catch up with the world's advanced technology as soon as possible, my country introduced a number of international brands of pavers, such as Niigata from Japan, Dynapac, Vogler and ABG from Germany. In the 1980s, through learning and absorbing the world's advanced technology, my country independently developed a full range of pavers, and paver control systems also came into being. At this stage, pavers usually use "slipper" sensors and sonar sensors, relying on the guide beams or reference lines set up by surveyors to control the paving thickness and smoothness. Looking around the world, in the battle for the construction machinery market, whether the control method is excellent has become a key point. Topcon mmGPS measurement system consists of three parts: GNSS base station, laser transmitter and mmGPS mobile station. When the system is working, the GNSS base station sends differential signals to the mobile station receiver in real time through the radio transmitter, and the laser transmitter transmits elevation information to the mobile station in real time; the mmGPS mobile station receiver system processes and solves the received GPS satellite signals in the sky, the differential signals sent by the GNSS base station, and the elevation information transmitted by the laser transmitter, respectively, to achieve real-time GNSS plane centimeter-level and elevation millimeter-level positioning. Since the laser scanner emits an invisible laser beam, too many people standing or walking in the scanning area, and mechanical movement will affect the scanning quality, and the equipment based on laser system leveling is generally expensive and costly. Summary of the invention

[0003] The present invention provides a 3D paving system based on liquid leveling, aiming to propose a new 3D paving leveling method, reduce the impact on signal transmission, and reduce equipment cost investment.

[0004] The present invention provides a 3D paving system based on liquid leveling, which comprises: a paver, a 3D paving control module electrically connected to the paver, and a liquid leveling module, wherein the liquid leveling module obtains elevation information of the paver in real time and sends the elevation information to the 3D paving control module, wherein the 3D paving control module generates a paving instruction corresponding to the paver after obtaining the elevation information, and the paver executes the current paving thickness according to the paving instruction, and the liquid leveling module comprises a measuring tube, wherein the measuring tube comprises a first A straight pipe, a second straight pipe vertically fixed at a predetermined monitoring point, and a connecting pipe connected between the lower pipe opening of the first straight pipe and the lower pipe opening of the second straight pipe, the connecting pipe is lower than the first straight pipe and the second straight pipe, the connecting pipe is a hose with a length greater than the distance between the first straight pipe and the second straight pipe, the measuring tube is injected with measuring liquid, the liquid level of the measuring liquid is located in the first straight pipe and the second straight pipe, a measuring instrument for monitoring the liquid level of the second straight pipe is provided at the predetermined monitoring point, and the measuring instrument is electrically connected to the 3D paving control module.

[0005] The embodiment of the present invention obtains the elevation information of the paver in real time through the liquid leveling module, and sends the elevation information to the 3D paving control module. After obtaining the elevation information, the 3D paving control module generates a paving instruction corresponding to the paver, and uses the pressure balance principle of the liquid to transmit the elevation. It has strong anti-interference ability in signal transmission and also has greater advantages in economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0007] Figure 1 It is a structural schematic diagram of a 3D paving system based on liquid leveling provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0008] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0009] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0010] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0011] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0012] See also Figure 1 , is a structural schematic diagram of a 3D paving system based on liquid leveling provided by an embodiment of the present invention, the 3D paving system based on liquid leveling comprises: a paver 10, a 3D paving control module 30 electrically connected to the paver 10, and a liquid leveling module, the liquid leveling module acquires elevation information of the paver 10 in real time, and sends the elevation information to the 3D paving control module 30, the 3D paving control module 30 generates a paving instruction corresponding to the paver after acquiring the elevation information, the paver 10 executes the current paving thickness according to the paving instruction, the liquid leveling module comprises a measuring tube, the measuring tube comprises a measuring tube vertically fixed to the paver 10, a first straight pipe 21 on the monitor, a second straight pipe 22 vertically fixed at a predetermined monitoring point 40, and a connecting pipe 23 connected between the lower pipe opening of the first straight pipe 21 and the lower pipe opening of the second straight pipe 22, the connecting pipe 23 is lower than the first straight pipe 21 and the second straight pipe 22, the connecting pipe 23 is a hose with a length greater than the distance between the first straight pipe 21 and the second straight pipe 22, a measuring liquid is injected into the measuring tube, the liquid level of the measuring liquid is located in the first straight pipe 21 and the second straight pipe 22, a measuring instrument 24 for monitoring the liquid level of the second straight pipe 22 is provided at the predetermined monitoring point 40, and the measuring instrument 24 is electrically connected to the 3D paving control module 30.

[0013] Specifically, the first straight pipe 21 is fixed on the paver 10, follows the movement of the paver 10, and synchronously feeds back the elevation change generated by the movement to the second straight pipe 22 fixed at the predetermined monitoring point through the connecting pipe 23, and the change of the liquid level can be directly and stably measured in the second straight pipe 22, so as to calculate the elevation information of the paver 10. In a specific implementation, for example, a scale can be set on the outer wall of the second straight pipe 22, and the scale value corresponding to the liquid level in the second straight pipe 22 can be obtained in real time through an infrared scanning device, so as to obtain the liquid level change value information. The elevation information of the paver 10 is obtained in real time through the liquid leveling module, and the elevation information is sent to the 3D paving control module 30. After obtaining the elevation information, the 3D paving control module 30 generates a paving instruction corresponding to the paver 10, and uses the pressure balance principle of the liquid to transmit the elevation. It has strong anti-interference in signal transmission, and also has greater advantages in economic benefits.

[0014] In one embodiment, if an unexpected situation occurs and causes the spreading machine 10 to shake, resulting in fluctuations in the liquid level in the measuring tube, the reading change value of the liquid level in the second straight tube 22 caused by the height adjustment of the spreading machine is collected, and the first maximum liquid level value and the first minimum liquid level value corresponding to the reading change value are read. The predicted liquid level equilibrium value of the corresponding liquid level after calming is calculated through the maximum liquid level value and the minimum liquid level value. At the same time when the liquid level returns to the predicted liquid level equilibrium value next time, the upper pipe opening of the second straight tube 22 and / or the upper pipe opening of the first straight tube 21 are blocked for a predetermined period of time and then unblocked. After the liquid level is still, the reading of the second straight tube 22 is read, and the elevation information is calculated based on the change in the reading of the second straight tube 22.

[0015] Specifically, if the liquid level in the second straight tube 22 is allowed to freely return to equilibrium, it generally takes a relatively long time. If the predicted liquid level equilibrium value is obtained by the highest value and the lowest value, the upper tube opening of the second straight tube 22 or the upper tube opening of the first straight tube 21 is blocked for a predetermined time at the same time when the liquid level returns to the predicted liquid level equilibrium value next time, and then the blockage is released. The predetermined time can be a moment much shorter than the original recovery time, such as 0.2 seconds. After blocking, the liquid in the tube will be forced to stop or slow down due to the remaining enclosed air at both ends, which will greatly reduce the total time for the liquid level in the second straight tube 22 to return to calm. For a good blocking effect, the upper tube openings of the second straight tube 22 and the upper tube openings of the first straight tube 21 can also be blocked at the same time.

[0016] In one embodiment, the liquid leveling module is also provided with an electric valve that can simultaneously block the upper pipe opening of the first straight pipe 21 and the upper pipe opening of the second straight pipe 22, or can individually block the upper pipe opening of the first straight pipe 21 or the upper pipe opening of the second straight pipe 22. The valve is not shown in the figure, and the valve is triggered to start by the 3D paving control module 30 when it needs to be started.

[0017] In one embodiment, after executing the step of reading the first maximum liquid level value and the first minimum liquid level value corresponding to the reading change value, it also includes: judging whether the difference between the maximum liquid level value or the minimum liquid level value and the liquid level static value before the change exceeds a first preset difference range, and the first preset difference range can be a fixed value or a range value; if the difference between the maximum liquid level value or the minimum liquid level value and the liquid level static value before the change does not exceed the first preset difference range, the paver maintains the current paving thickness and continues the paving operation.

[0018] In one embodiment, during the current liquid level adjustment cycle, the paving machine remains stationary or continues to operate at a preset speed lower than the normal driving speed.

[0019] Specifically, in order to prevent the paver from leveling too frequently and affecting the paving efficiency, the leveling trigger threshold can be pre-set, that is, whether the difference between the lowest liquid level and the static liquid level before the change exceeds the preset difference range. If it does not exceed this range, it is assumed that the paving road surface is flat and the paving operation continues. The leveling action will only be performed after the threshold is exceeded. Because liquid leveling requires a period of time to adjust the liquid level, it is best to keep the paver still at this time, which can improve the smoothness and continuity of the road surface after the paving operation, or continue the operation at a preset speed lower than the normal driving speed to cross the road surface in an emergency.

[0020] In one embodiment, the measuring liquid is water or a liquid with a viscosity not greater than that of water.

[0021] Specifically, the measuring liquid may be, for example, water or mercury, but is not limited thereto, and may also be replaced by other liquids whose viscosity is not greater than that of water.

[0022] Example 1

[0023] Take water as the liquid in the measuring tube as an example, choose a plastic transparent water tube to add an appropriate amount of water, the dimensions of the first straight tube, the second straight tube and the connecting tube are all 10mm in inner diameter and 13mm in outer diameter, and the connecting tube is 20m long. The following is the data obtained from the adjustment process when encountering emergencies during the specific experiment:

[0024] (1) In the equilibrium state, the liquid level reading in the second straight tube is 3cm. Suddenly, one end of the tube rises and rises to a fixed value. When the liquid in one end of the tube rises to the highest reading, the reading is recorded (the reading is 11cm), and the reading at the other end is recorded at the same time (the reading is 6cm). After that, the water level floats up and down, and it takes 7 seconds to reach equilibrium. The reading at equilibrium is about 8.5cm. This is in the absence of resistance. The leveling time of the liquid is a bit long. When the paver is operating normally, it will not wait so long before paving. So what method can be used to reduce this time? In this case, the following method of timed closing of the pipe end is used to reduce the closing time! In the equilibrium state, the readings at both ends of the tube are 3cm. Suddenly, one end of the tube is raised and raised to a fixed value. When the liquid in the tube rises to the highest reading at one end, the reading is recorded (the reading is 11cm), and the reading at the other end is recorded at the same time (the reading is 6cm). The default average of the two is 8.5cm. When the liquid level drops to 8.5cm, both ends of the tube are immediately closed. The closing time is about 0.2 seconds, and the equilibrium time is 1.6 seconds. The reading at equilibrium is also about 8.5cm. In this case, the forward speed of the paver is slightly reduced, and the normal paving data before the liquid level suddenly rises is used at the fixed time at the beginning. The road surface can basically be paved very smoothly. In the case of sudden potholes, the 3D intelligent paving system currently on the market cannot achieve the leveling effect in one go.

[0025] In one embodiment, after the paver continues to operate at a preset speed lower than the normal driving speed, it also includes: judging whether the first maximum liquid level fluctuation of the liquid level in the second tube body after the first unblocking or the difference between the maximum liquid level and the predicted liquid level balance value exceeds a second preset difference range; if the first maximum liquid level fluctuation of the liquid level in the second tube body after the first unblocking or the difference between the maximum liquid level and the predicted liquid level balance value exceeds the second preset difference range, then starting the liquid level adjustment process for the second time.

[0026] Specifically, if the liquid level at both ends of the water pipe is forced to level for the first time and then the pipe ends are released, the liquid level does not reach a nearly static state, but moves over a large range again. This situation should be because the paver has passed through a slightly up and down area twice in a row. At this time, the port needs to be forced to level for the second time, and the leveling time is correspondingly increased. In response to this change, the following example is made.

[0027] Example 2

[0028] Use water as the liquid in the tube, choose a plastic transparent water pipe and add an appropriate amount of water. The water pipe is 20m long, the inner diameter of the pipe is 10mm, and the outer diameter of the pipe is 13mm.

[0029] In the equilibrium state, the water level in the water pipe is 5cm. Suddenly, the water pipe on the right is raised by 6cm, and after staying for 1 second, it is raised by 6cm again. The liquid level on the left rises accordingly, and the position where the liquid level on the right moves relatively is decreasing. When the liquid level on the left rises to the highest position (the position where the liquid level is basically static), record the elevation reading of 15 and the time of 1.88 seconds. After that, the liquid level on the left begins to decrease. When it drops to the lowest point (the position where the liquid level is basically static), record the elevation reading of 6.5cm (estimated) and the time of 3.55 seconds. When the liquid level on the left rises to 10.75cm (approximately) again, close both ends of the pipe. The closing time is about 0. .2 seconds, and the equilibrium time is 5.3 seconds. After a stay of about 0.2 seconds, the end is released, and the liquid level continues to move and rises slightly on the left. When the liquid level on the left rises to the highest point, the elevation is recorded as 11 cm, and the time is 5.6 seconds. Thereafter, the liquid level drops, and when it drops to the average, the two ends of the tube are forcibly closed. The closing time is about 0.2 seconds. After the closing is stopped, the liquid level basically does not move. The total staying time is 6.1 seconds. This is the time when encountering relatively large potholes and there are two consecutive large fluctuations of the liquid level in a short period of time. If the road surface to be paved is relatively smooth, the liquid level fluctuation will not be so large, and the relative stillness time of the liquid level will not be so long.

[0030] The above is a test conducted on a 20-meter-long water pipe. In the actual construction process, it is impossible to relocate the site every 20 meters. At present, the generally controlled distance of 3D paving is about 80 meters, which can still meet the construction requirements. In view of this situation, we conducted a test using a 100-meter-long water pipe.

[0031] Example 3

[0032] Take water as the liquid in the tube, choose a plastic transparent water tube and add an appropriate amount of water. The length of the water tube is 100m, the inner diameter of the tube is 10mm, and the outer diameter of the tube is 13mm. The water level in the water tube is 5cm in the equilibrium state. Suddenly raise the right side of the water tube by 6cm, stay for 1 second and then raise it by 6cm. The liquid level on the left side rises accordingly, and the position where the liquid level on the right side stays after relative movement is decreasing. When the liquid level on the left side rises to the highest position (the position where the liquid level is basically still), record the elevation reading of 14cm and the time of 2.89 seconds. After that, the liquid level on the left side begins to decrease. When it drops to the lowest point (the position where the liquid level is basically still), record the elevation reading of 7.5cm and the time of 4.89 seconds. , when the left liquid level rises to 10.75cm again, close both ends of the tube. The closing time is about 0.2 seconds, and the equilibrium time is 5.73 seconds. After staying for about 0.2 seconds, release the end, and the liquid level continues to move. The left side rises slightly. When the left liquid level rises to the highest point, record the elevation reading of 11cm and the time of 6.21 seconds. After that, the liquid level drops. When it drops to the average, force the two ends of the tube to close. The closing time is about 0.2 seconds. After stopping the closing, the liquid level basically does not move. The total staying time is 7.01 seconds. In this case, water is used as the leveling liquid. If a high-density liquid can be used, the reaction time will be reduced to a certain extent.

[0033] For different liquids, if their adhesion resistance is the same, the liquid with a higher density has a shorter reaction time. You can choose the required liquid appropriately according to actual needs and cost.

[0034] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A 3D paving system based on liquid leveling, characterized in that: include: A paver, a 3D paving control module electrically connected to the paver, and a liquid leveling module, the liquid leveling module acquiring elevation information of the paver in real time and sending the elevation information to the 3D paving control module, the 3D paving control module generating a paving instruction corresponding to the paver after acquiring the elevation information, the paver executing the current paving thickness according to the paving instruction, the liquid leveling module comprising a measuring tube, the measuring tube comprising a first straight tube vertically fixed on the paver, a second straight tube vertically fixed at a predetermined monitoring point, and a connecting tube connected between the lower pipe mouth of the first straight tube and the lower pipe mouth of the second straight tube, the connecting tube being lower than the first straight tube and the second straight tube, the connecting tube being a hose with a length greater than the distance between the first straight tube and the second straight tube, the measuring tube being injected with measuring liquid, the liquid level of the measuring liquid being located at the first straight tube. In the one straight pipe and the second straight pipe, a measuring instrument for monitoring the liquid level of the second straight pipe is provided at the predetermined monitoring point, and the measuring instrument is electrically connected to the 3D paving control module. When an unexpected situation occurs and causes the paving machine to be jolted and causes the liquid level in the measuring pipe to fluctuate, a liquid level adjustment process is executed, and the liquid level adjustment process includes collecting the reading change value of the liquid level in the second straight pipe, reading the first highest liquid level value and the first lowest liquid level value corresponding to the reading change value, and calculating the corresponding predicted liquid level balance value of the liquid level after calming through the highest liquid level value and the lowest liquid level value, and at the same time when the liquid level returns to the predicted liquid level balance value next time, the upper pipe opening of the second straight pipe and / or the upper pipe opening of the first straight pipe are blocked for a predetermined period of time and then unblocked, and the reading of the second straight pipe is read after the liquid level is still, and the elevation information is calculated according to the change value of the reading of the second straight pipe.

2. The 3D paving system based on liquid leveling according to claim 1, characterized in that: The liquid leveling module is also provided with an electric valve which can simultaneously block the first straight pipe upper opening and the second straight pipe upper opening, or can individually block the first straight pipe upper opening or the second straight pipe upper opening.

3. The 3D paving system based on liquid leveling according to claim 1, characterized in that: After executing the step of reading the first highest liquid level value and the first lowest liquid level value corresponding to the reading change value, the method further includes: Determine whether the difference between the maximum value of the liquid level or the minimum value of the liquid level and the static value of the liquid level before the change exceeds a first preset difference range; If the difference between the maximum value of the liquid level or the minimum value of the liquid level and the static value of the liquid level before the change does not exceed a first preset difference range, the paver maintains the current paving thickness and continues the paving operation.

4. The 3D paving system based on liquid leveling according to claim 1, characterized in that: When in the current liquid level adjustment cycle, the paver remains stationary or continues to operate at a preset speed lower than the normal driving speed.

5. The 3D paving system based on liquid leveling according to claim 4, characterized in that: After the paver continues to operate at a preset speed lower than the normal driving speed, it also includes: Determine whether the first maximum liquid level value of the liquid level fluctuation in the second straight tube after the first unblocking or the difference between the maximum liquid level value and the predicted liquid level equilibrium value exceeds a second preset difference range; If the first maximum liquid level value of the liquid level fluctuation in the second straight tube after the first unblocking or the difference between the maximum liquid level value and the predicted liquid level equilibrium value exceeds the second preset difference range, the liquid level adjustment process is started for the second time.

6. The 3D paving system based on liquid leveling according to claim 1, characterized in that: The measuring liquid is water or a liquid whose viscosity is not greater than that of water.

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