Roadbed rolling monitoring system

Abstract

The invention discloses a roadbed rolling monitoring system, and relates to the technical field of road construction. The device specifically comprises a display device, a monitoring assembly used for monitoring the position of the power control rod and a controller, the monitoring assembly and the display device are electrically connected with the controller, and the monitoring assembly is used for detecting the position of the power control rod and inputting the position information of the power control rod into the controller; the controller judges whether the road roller advances or retreats according to the position information of the power control rod, the controller counts the rolling times of the roadbed according to the advancing and retreating of the road roller, and the display device is used for displaying the rolling times counted by the controller. The rolling frequency is judged by monitoring the power control rod, external network or satellite positioning is not needed, and the purpose of monitoring the rolling frequency in non-signal areas such as underground areas, mountainous areas and tunnels can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of road construction, and in particular provides a roadbed compaction monitoring system. Background Art

[0002] Road rollers are widely used in road construction or road maintenance. Roads are usually divided into base layers and surface layers. During road construction or road maintenance, after the base layer construction is completed, it is necessary to lay materials for forming the surface layer on the base layer and compact the materials by the road roller. During the surface layer forming process, the road roller needs to roll the materials many times to compact the materials, thereby ensuring the quality of the road. For example, after the surface layer material is laid, the road roller needs to move back and forth repeatedly in one direction to reduce. During the rolling process, the roller operator tends to forget or misremember the number of rolling times, resulting in insufficient rolling times. When the number of rolling times is insufficient, the materials constituting the road are not compacted, resulting in poor road quality; conversely, too many rolling times will lead to over-pressure, which will also lead to poor road quality. Therefore, in the prior art, a technology for monitoring the number of rolling times of the road roller through satellite signals has been developed. For example, the invention patent with the announcement number CN113737614B and the name of a road base unmanned driving group rolling system can obtain the number of rolling times of the road roller through Beidou monitoring of the road roller to avoid the problem of insufficient rolling times.

[0003] However, in underground construction environments such as tunnels, it is difficult for satellite signals to monitor the roller, so it is impossible to count the number of times the roadbed is rolled, and operators still need to perform manual counting. Therefore, in signal-free construction environments such as tunnels, there is still a problem of being unable to accurately monitor the number of times the roadbed is rolled, which needs to be solved urgently. Summary of the invention

[0004] The present invention provides a roadbed compaction monitoring system, which is used to solve the problem that the number of roadbed compaction times cannot be accurately monitored in a signal-free construction environment such as a tunnel.

[0005] The technical solution of the present invention is as follows:

[0006] A roadbed compaction monitoring system includes a display device, a monitoring component for monitoring the position of a power control lever, and a controller. The monitoring component and the display device are electrically connected to the controller respectively. The monitoring component is used to detect the position of the power control lever and input the position information of the power control lever into the controller. The controller determines whether the roller is moving forward or backward according to the position information of the power control lever. The controller counts the number of roadbed compactions according to the forward and backward movement of the roller. The display device is used to display the number of compactions that the controller has counted.

[0007] In this solution, the monitoring component can monitor the position of the power control lever. The power control lever of the roller is used to control the roller to move forward or backward. The power control lever is usually set on the right side of the driver's seat. When the power control lever moves forward, the roller moves forward; conversely, when the power control lever moves backward, the roller moves backward. When the roller rolls the roadbed, it rolls the roadbed by continuously moving forward and backward. When the roller switches from moving forward to moving backward, it means that the roller has completed one rolling and needs to move backward for another rolling. The forward and backward movement of the roller needs to be controlled by the power control lever. Therefore, this solution monitors the position of the power control lever through the monitoring component to determine whether the roller is moving forward or backward, thereby judging the number of times the roller rolls the roadbed. The display device is used to display the number of rolling times, so that the driver can intuitively observe the number of rolling times to prevent the roadbed from being rolled too many or too few times. The power control lever can be monitored by the monitoring component without connecting to the external network. It can be used in mountainous areas, tunnels, underground and other network-free environments and can be applied to various harsh environments.

[0008] During the roadbed rolling process, the roller may deviate from the rolling route. At this time, the roller may temporarily reverse to return to the rolling route. At this time, the controller will monitor the power control lever position to change backward. In order to prevent the controller from counting this short-term reversal as a rolling number, when the controller counts the roadbed rolling times, when the power control lever position changes and maintains the specified time, the controller counts the number of times. When the controller counts the number of times, the display device updates the displayed rolling number.

[0009] In this solution, the controller will only add a new statistical number of crushing times after the position of the power control lever has changed for a certain period of time, which can effectively avoid the problem of inaccurate statistical times caused by a brief setback.

[0010] Preferably, the monitoring assembly includes a fixed seat and a movable seat, the movable seat is connected to the power control lever and moves with the power control lever, the fixed seat is arranged on the roller body, and a sensing element is arranged between the movable seat and the fixed seat, the sensing element is used to sense the position of the movable seat relative to the fixed seat, and the sensing element is electrically connected to the controller.

[0011] In this solution, because the movable seat is installed on the power control rod, the movable seat can move with the power control rod, so monitoring the position of the power control rod can be achieved by monitoring the position of the movable seat relative to the fixed seat. The provision of the movable seat makes it easier to install the sensing element and reduces the difficulty of monitoring the power control rod.

[0012] Preferably, the sensing element includes a detection rod and a connecting hole adapted to the detection rod, the detection rod is provided with a resistor, the resistor is arranged along the axial direction of the detection rod, one end of the detection rod is hinged to the movable seat, the fixed seat is provided with a connecting hole, the detection rod and the connecting hole are slidably connected, two conductive contact pins are provided in the connecting hole, the two conductive contact pins are respectively located on both sides of the hole wall of the connecting hole, the two conductive contact pins are in contact with the resistor at the same time, the two conductive contact pins are connected through the resistor, the circuit where the two conductive contact pins are located is provided with a resistance tester, the resistance tester is electrically connected to the controller, the sliding of the detection rod along the axial direction of the connecting hole will change the resistance value, and the controller judges the position of the power control rod by the resistance value.

[0013] In this solution, when the power control rod moves, it will drive the movable seat and the detection rod to move, and the movement of the detection rod will slide relative to the connection hole, so that the contact position between the two conductive contact pins and the resistor sheet on the detection rod changes. When the detection rod moves, it only needs to make the contact position between the conductive contact pins and the resistor sheet different, and the resistance value detected in the circuit where the resistance tester is located will also change. The controller can determine the position of the operating rod based on the change in resistance value. The advantages of this setting method are that it is stable and reliable, is less affected by the vibration of the roller, and can adapt to harsh environments.

[0014] Preferably, the detection rod is provided with a strip through hole, the length direction of the strip through hole is parallel to the axial direction of the detection rod, and a number of resistor sheets with different resistance values ​​are arranged in the strip through hole. When the detection rod slides along the axial direction of the connecting hole, the conductive contact pin will contact different resistor sheets, causing the resistance value detected by the resistance tester to change.

[0015] In this solution, a plurality of resistor sheets are arranged along the axis direction of the detection rod. When the detection rod moves, the conductive contact pin will be connected to different resistor sheets, so that the resistance value in the circuit where the resistance tester is located changes. The advantage of this arrangement is that materials with large resistance value differences can be selected to form the resistor sheets. After the detection rod moves, the resistance value in the circuit where the resistance tester is located can change significantly, thereby improving the accuracy of the detection and reducing the accuracy requirements of the resistance tester, thereby achieving the effect of reducing costs.

[0016] Preferably, along the axial direction of the detection rod, the resistance value of each resistor increases or decreases.

[0017] In this solution, the resistance value of the resistor increases or decreases along the axis direction of the detection rod. The regular change of the resistance value makes it easier to judge the position of the detection rod and is also more convenient for installing the resistor.

[0018] Preferably, the resistor sheet can also be another implementation structure, in which the shape of the resistor sheet is U-shaped, and the resistor sheet is connected to both sides of the detection rod at the same time. Two conductive contact pins are respectively in contact with the resistor sheet on both sides of the detection rod, and the detection rod moves along the connecting hole to change the resistance value in the circuit where the resistance tester is located.

[0019] In this solution, only one resistor is provided. When the detection rod moves, the contact position between the conductive contact pin and the resistor changes, and the length of the resistor between the two conductive contact pins also changes accordingly, that is, the resistance value of the circuit where the resistance tester is located changes. The advantage of this arrangement is that the structure is simple and easy to install.

[0020] Since the moving direction of the power control rod of the roller is to swing around the valve, the angle of the detection rod will change when the power control rod moves. In order to solve the problem that the power control rod is stuck when the detection rod is connected to the fixed seat, the fixed seat includes a first seat body, an elastic connecting piece and a second seat body. The first seat body is fixedly connected to the roller body, and the second seat body is connected to the first seat body through an elastic connecting piece. The connecting hole is opened in the second seat body.

[0021] In the present solution, because the first seat body and the second seat body are connected by an elastic connecting member, when the angle of the detection rod changes, the second seat body is acted upon by the detection rod and transmits the force to the elastic connecting member. At this time, the elastic connecting member is adaptively deformed by the force of the second seat body, so that the angle of the second seat body follows the change of the detection rod, thereby preventing the second seat body and the detection rod from getting stuck and causing the power control rod to be unable to move.

[0022] Preferably, the elastic connecting member includes a spring or a rubber block.

[0023] In this solution, springs or rubber blocks are low-cost mature products in the market, which are easy to obtain and low in cost.

[0024] Preferably, the system further comprises an indicator light which is electrically connected to the controller, and when the number of rolling times counted by the controller reaches a specified number, the controller controls the indicator light to flash.

[0025] In this solution, the indicator light can remind the driver to prevent the driver from forgetting to pay attention to the display device due to fatigue.

[0026] Beneficial effects of the present invention:

[0027] The present invention monitors the power control lever to determine the number of rolling times, does not require external network or satellite positioning, and can achieve the purpose of monitoring the number of rolling times in areas without signals such as underground, mountainous areas, tunnels, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solution of the present invention, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 is a schematic diagram of a power control lever and a monitoring assembly of the present invention;

[0030] Figure 2 A circuit diagram of the resistance tester, the detection rod and the conductive contact pin of the present invention;

[0031] Figure 3 A cross-sectional view of an embodiment of a detector of the present invention;

[0032] Figure 4 for Figure 3 A top view of

[0033] Figure 5 A front view of another embodiment of the detector of the present invention;

[0034] Figure 6 for Figure 5 A top view of

[0035] Figure 7 A front view of another embodiment of the detector of the present invention;

[0036] Figure 8 The left side view of the fixed seat.

[0037] In the above drawings, the corresponding reference numerals are as follows:

[0038] 1. Power control lever; 2. Movable seat; 3. Detection rod; 4. Fixed seat; 5. Resistance tester; 6. Conductive contact pin; 7. Resistor sheet; 8. Strip through hole; 9. Insulating layer; 10. First seat body; 11. Elastic connecting piece; 12. Second seat body; 13. Connecting hole. DETAILED DESCRIPTION

[0039] In conjunction with the accompanying drawings, the technical solution of the present invention is clearly and completely described through specific implementation methods of the embodiments of the present invention.

[0040] Embodiment 1:

[0041] like Figure 1As shown, this embodiment 1 provides a roadbed rolling monitoring system for monitoring the number of times the roller rolls the roadbed to prevent under-pressure due to too few rolling times or over-pressure due to too many rolling times. The system includes a display device, a monitoring component and a controller, wherein the display device is used to display the number of rolling times, and the driver can watch the display device to determine the number of rolling times to prevent the driver from forgetting the number of rolling times and causing under-pressure or over-pressure. The monitoring component is used to monitor the power control lever 1 of the roller, and the power control lever 1 of the roller is used to control the roller to move forward or backward. When the roller starts rolling the roadbed, it moves forward and backward on the roadbed to roll back and forth. When the roller switches from forward to backward, it usually completes one rolling. Similarly, when the roller switches from backward to forward, it also means that one rolling is completed. Therefore, the monitoring component is used to monitor the power control lever 1, and the forward and backward states of the roller are judged by the position of the power control lever 1. When the monitoring component monitors the power control lever 1, the position signal of the power control lever 1 is sent to the controller, and the controller converts the signal into the number of rolling times and displays it through the display device. In other words, the monitoring component and the display device are electrically connected to the controller.

[0042] The display device is a display screen, which is used to display the specified number of rolling times and the number of rolling times that have been completed.

[0043] During implementation, the roller needs to move itself to achieve the transfer in a small range. During this process, the monitoring component does not need to monitor. Therefore, a start switch can be configured for the monitoring component or the controller. When it is necessary to start counting, press the start switch, the monitoring component starts to monitor the power control lever 1, and the controller starts counting.

[0044] During the rolling process, the roller needs to roll along the prescribed path to ensure uniform rolling quality of the roadbed, thereby ensuring the quality of the road. If the roller accidentally deviates from the rolling path during the rolling process, it may need to return to the original rolling path in the opposite direction. In order to prevent this process from being counted as one rolling number by the controller, an anti-misjudgment setting can be set for the controller. The anti-misjudgment setting means that when the monitoring component monitors that the power control lever 1 moves forward or backward, it needs to maintain a specified length of time in this state before the controller will count the number of times and control the display device to update the displayed rolling number once, adding one to the original rolling number.

[0045] If the time length specified in the anti-misjudgment setting is greater than one minute, the time required for the roller to return to the originally set rolling path will usually not exceed one minute, which can avoid the problem of incorrect counting of the number of rolling times due to adjusting the position of the roller.

[0046] An anti-misjudgment setting is set in the controller so that there is no need to manually adjust the monitoring system during the roller position adjustment process, which will not increase the operating difficulty for the driver.

[0047] The system is also provided with a timing module and a printing device, which are electrically connected to the controller respectively. When the monitoring component starts monitoring, the timing module starts timing. After the controller counts a rolling, the controller will obtain the duration of a rolling from the timing module and record the start time and end time of the rolling. The end time of a rolling is also the start time of the next rolling. After completing the specified number of rollings, the controller controls the printing device to print out the number of rollings and time. For example, the first rolling was from 14:00 to 14:15, and the second rolling was from 14:15 to 14:28. The printing device can use a receipt printer, and the rolling conditions of each section of the path can be viewed through the printed files.

[0048] The controller can be a single chip microcomputer or PLC. The whole system does not need to be connected to the external network and can be used in mountainous areas, tunnels, underground and other non-network environments.

[0049] like Figure 1 As shown, the monitoring assembly is used to monitor the position of the power control lever 1, and includes a fixed seat 4, a sensing element and a movable seat 2, wherein the fixed seat 4 is arranged on the body of the road roller, and the fixed seat 4 is located at the front side or the rear side of the power control lever 1. The movable seat 2 is arranged on the power control lever 1, and the movable seat 2 moves with the power control lever 1. The sensing element is arranged between the fixed seat 4 and the movable seat 2, and is used to sense the position of the movable seat 2. Because the movable seat 2 is located on the power control lever 1, the purpose of monitoring the position of the power control lever 1 can be achieved by monitoring the position of the movable seat 2 relative to the fixed seat 4.

[0050] It should be noted that monitoring the position of the power control lever 1 actually means monitoring whether the power control lever 1 is in the forward position or the backward position, so as to determine whether the roller is in the forward or backward state.

[0051] The sensing element includes a detection rod 3 and a connection hole 13 adapted to the detection rod 3, wherein one end of the detection rod 3 is hinged to the movable seat 2, the detection rod 3 is movably connected to the connection hole 13, and the connection hole 13 is arranged on the fixed seat 4. A resistor 7 is arranged on the detection rod 3, and two conductive contact pins 6 are arranged in the connection hole 13, the two conductive contact pins 6 are respectively located on opposite sides of the connection hole 13, and the conductive contact pins 6 are in contact with the resistor 7. In other words, the resistor 7 electrically connects the two conductive contact pins 6. Figure 2As shown, it also includes a resistance tester 5, the resistor sheet 7, two conductive contact pins 6 and the resistance tester 5 are located in the same circuit, and the resistance tester 5 is used to detect the resistance in the circuit, that is, to detect the resistance of the resistor sheet 7. When the detection rod 3 moves along the connecting hole 13, the contact position of the two conductive contact pins 6 with the resistor sheet 7 changes, and the resistance value between the two conductive contact pins 6 changes accordingly. Therefore, the change information of the resistance value can be obtained through the resistance tester 5. The resistance tester 5 is electrically connected to the controller, and the controller can determine the position of the power control rod 1 according to the change information of the resistance value. For example, when the power control rod 1 is located in the forward position, the resistance value is located in a numerical range, and when the power control rod 1 is located in the backward position, the resistance value is located in another numerical range, and the two numerical ranges have no overlapping area. Therefore, the power control rod 1 is located in which numerical range the resistance value is located.

[0052] In order to enable the movement of the detection rod 3 to change the resistance between the two conductive contact pins 6, this embodiment provides two implementation methods as examples, and other methods that can achieve this effect should also fall within the protection scope of the present invention.

[0053] like Figure 3 and Figure 4 As shown, one implementation mode is that two resistor sheets 7 are arranged on the detection rod 3, the resistance values ​​of the two resistor sheets 7 are different, and the two resistor sheets 7 are arranged along the axial direction of the detection rod 3. When the power control rod 1 is in the forward position, the two conductive contact pins 6 are in contact with one resistor sheet 7, and when the power control rod 1 is in the backward position, the two conductive contact pins 6 are in contact with the other resistor sheet 7. Therefore, the movement of the detection rod 3 can change the resistance between the two conductive contact pins 6. In order to facilitate the conductive contact pins 6 on both sides of the detection rod 3 to contact the resistor sheets 7, a strip through hole 8 is arranged on the detection rod 3, and the strip through hole 8 runs through the side of the detection rod 3, and the resistor sheet 7 is installed in the strip through hole 8. The resistor sheets 7 can be separated by an insulating layer 9, for example, a plastic sheet is arranged between the resistor sheets 7, and the plastic sheet and the resistor sheet 7 are fixed by screws or glue.

[0054] like Figure 5 and Figure 6As shown, another embodiment is to set a U-shaped resistor sheet 7 on the detection rod 3, and the two ends of the U-shaped resistor sheet 7 are respectively connected to the two opposite sides of the detection rod 3, and the two conductive contact pins 6 are respectively in contact with the resistor sheet 7 on both sides of the detection rod 3. At this time, the resistance value between the two conductive contact pins 6 is related to the contact position between the two conductive contact pins 6 and the resistor sheet 7. The current in the circuit flows from one conductive contact pin 6 to another conductive contact pin 6. The greater the distance between the two conductive contact pins 6 and the end of the resistor sheet 7, the shorter the length of the resistor through which the current passes, and the smaller the resistance value detected by the resistance tester 5; conversely, the smaller the distance between the two conductive contact pins 6 and the end of the resistor sheet 7, the longer the length of the resistor through which the current passes, and the larger the resistance value detected by the resistance tester 5. Therefore, when the power control lever 1 is in the stop position, that is, between the forward position and the backward position, the resistance tester 5 will detect a specific resistance value. When the fixing seat 4 is located in front of the power control lever 1 and the resistance value is greater than the specific resistance value, it means that the power control lever 1 is in the forward position; and when the resistance value is less than the specific resistance value, it means that the power control lever 1 is in the backward position; when the fixing seat 4 is located on the rear side of the power control lever 1 and the resistance value is greater than the specific resistance value, it means that the power control lever 1 is in the backward position, and when the resistance value is less than the specific resistance value, it means that the power control lever 1 is in the forward position.

[0055] The two embodiments listed above can not only monitor the position of the power control lever 1, but the second embodiment can also monitor the speed of the roller. The greater the forward movement of the power control lever 1, the faster the roller moves forward, and the greater the backward movement of the power control lever 1, the faster the roller moves backward. In the second embodiment, the resistance value changes continuously with the movement of the detection rod 3, so the moving speed of the roller can be judged by the size of the resistance value.

[0056] like Figure 7 As shown, the first embodiment can also determine the speed of the roller after improvement. The improvement is as follows: more resistors 7 need to be arranged in the strip-shaped through hole 8, each resistor 7 has a different resistance value, and each resistor 7 is arranged along the axial direction of the detection rod 3, and each resistor 7 is arranged in order according to the size of the resistance value. In this case, the size of the resistance value is also related to the movement amount of the detection rod 3, and the speed of the roller can also be determined by the size of the resistance value. The thickness of the insulating layer 9 between each resistor 7 should be as thin as possible to avoid the conductive contact pin 6 being in contact with the insulating layer 9.

[0057] Because the speed of the roller is also closely related to the compaction effect of the roadbed, the controller can correspond the change in resistance value to the speed of the roller, and then print it out through a printer to facilitate monitoring of the roller's compaction conditions.

[0058] The power control lever 1 is actually a valve used to control the forward and backward movement of the roller. The power control lever 1 usually moves in a swinging manner. Therefore, when the power control lever 1 moves, the angle of the detection lever 3 will change. In order to prevent the detection lever 3 from getting stuck with the connecting hole 13 and causing the movement of the power control lever 1 to be blocked, the fixing seat 4 is deformed. Figure 8 As shown, the fixing seat 4 includes a first seat body 10, an elastic connecting member 11 and a second seat body 12. The first seat body 10 is connected to the body of the road roller, and the first seat body 10 and the second seat body 12 are connected through the elastic connecting member 11. The connecting hole 13 is provided in the second seat body 12. When the angle of the detection rod 3 changes, the elastic connecting member 11 will be elastically deformed by force, so that the second seat body 12 can change the angle with the detection rod 3 to avoid the detection rod 3 and the connecting hole 13 from getting stuck.

[0059] The elastic connecting member 11 may be a spring or a rubber block.

[0060] The system also includes an indicator light, which can be set on the steering wheel or on the side of the instrument panel, and the indicator light is electrically connected to the controller. When the counted rolling times reaches the set times, the controller will control the indicator light to flash to remind the driver to end the rolling of the roadbed.

[0061] Different roadbed materials are used in different areas, and different rolling times are required. Therefore, the controller is also equipped with a programmer to adjust the set rolling times to ensure that the indicator will flash only when the statistical rolling times reach the set rolling times.

Claims

1. A roadbed compaction monitoring system, characterized in that: The invention comprises a display device, a monitoring component for monitoring the position of a power control lever (1), and a controller, wherein the monitoring component and the display device are electrically connected to the controller respectively, wherein the monitoring component is used to detect the position of the power control lever (1) and input the position information of the power control lever (1) into the controller, wherein the controller determines whether the roller is moving forward or backward according to the position information of the power control lever (1), and the controller counts the number of times the roller rolls the roadbed according to the number of times the roller moves forward or backward, and the display device is used to display the number of times the controller has counted the number of times the roller has rolled.

2. A roadbed compaction monitoring system according to claim 1, characterized in that: When the controller counts the number of times the roadbed is rolled, when the position of the power control lever (1) changes and remains for a specified period of time, the controller counts the number of times once. When the controller counts the number of times once, the display device updates the number of times of rolling displayed once.

3. A roadbed compaction monitoring system according to claim 1, characterized in that: The monitoring assembly comprises a fixed seat (4) and a movable seat (2); the movable seat (2) is connected to a power control lever (1) and moves following the power control lever (1); the fixed seat (4) is arranged on a roller body; a sensing element is arranged between the movable seat (2) and the fixed seat (4); the sensing element is used to sense the position of the movable seat (2) relative to the fixed seat (4); and the sensing element is electrically connected to a controller.

4. A roadbed compaction monitoring system according to claim 3, characterized in that: The sensing element comprises a detection rod (3) and a connection hole (13) adapted to the detection rod (3); the detection rod (3) is provided with a resistor (7) which is arranged along the axial direction of the detection rod (3); one end of the detection rod (3) is hinged to the movable seat (2); the fixed seat (4) is provided with a connection hole (13); the detection rod (3) and the connection hole (13) are slidably connected; two conductive contact pins (6) are arranged in the connection hole (13); the two conductive contact pins (6) are respectively located on both sides of the hole wall of the connection hole (13); the two conductive contact pins (6) are in contact with the resistor (7) at the same time; the two conductive contact pins (6) are connected through the resistor (7); a resistance tester (5) is provided in the circuit where the two conductive contact pins (6) are located; the resistance tester (5) is electrically connected to a controller; the sliding of the detection rod (3) along the axial direction of the connection hole (13) will change the resistance value in the circuit where the resistance tester (5) is located; the controller determines the position of the power control rod (1) according to the resistance value.

5. A roadbed compaction monitoring system according to claim 4, characterized in that: The detection rod (3) is provided with a strip-shaped through hole (8), the length direction of the strip-shaped through hole (8) is parallel to the axial direction of the detection rod (3), and a plurality of resistor sheets (7) with different resistance values ​​are arranged in the strip-shaped through hole (8). When the detection rod (3) slides along the axial direction of the connecting hole (13), the conductive contact pin (6) contacts with different resistor sheets (7), thereby changing the resistance value detected by the resistance tester (5).

6. A roadbed compaction monitoring system according to claim 5, characterized in that: Along the axial direction of the detection rod (3), the resistance value of each resistor sheet (7) increases or decreases.

7. A roadbed compaction monitoring system according to claim 4, characterized in that: The resistor sheet (7) is in a U-shape and is connected to both sides of the detection rod (3) at the same time. The two conductive contact pins (6) are in contact with the resistor sheet (7) on both sides of the detection rod (3) respectively. The detection rod (3) moves along the connection hole (13) to change the resistance value in the circuit where the resistance tester (5) is located.

8. A roadbed compaction monitoring system according to claim 4, characterized in that: The fixed seat (4) comprises a first seat body (10), an elastic connecting piece (11) and a second seat body (12); the first seat body (10) is fixedly connected to the roller body; the second seat body (12) is connected to the first seat body (10) via the elastic connecting piece (11); and the connecting hole (13) is provided in the second seat body (12).

9. A roadbed compaction monitoring system according to claim 8, characterized in that: The elastic connecting member (11) comprises a spring or a rubber block.

10. A roadbed compaction monitoring system according to claim 9, characterized in that: It also includes an indicator light, which is electrically connected to the controller. When the number of rolling times counted by the controller reaches a specified number, the controller controls the indicator light to flash.

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