CN114753219A - Road springback and deflection detection device based on Beckman beam method and use method - Google Patents

Abstract

The invention discloses a device for detecting the rebound and deflection of a road based on a Beckman beam method and a using method thereof, wherein the detection device comprises a connecting frame; a platform truck; the Beckman beam is hinged with the platform truck; the sliding assembly comprises a sliding block and a supporting rod, the sliding block is connected with the platform car in a sliding mode, the supporting rod is installed on the sliding block, and the supporting rod can jack up the Beckman beam; the traction assembly comprises a motor, a contact switch and a rope, the motor is electrically connected with the contact switch, the contact switch can be triggered by a sliding block, and the rope bypasses a connecting frame and two ends of the rope are connected to an output shaft and the sliding block of the motor respectively. According to the invention, the Beckman beams are loaded on the platform truck, and the platform truck can be driven to move when the connecting frame moves, so that the labor burden when the measuring equipment is carried is reduced; during the testing process, the link moves and the platform truck stays in situ through the rope unwrapping wire for data acquisition, and after the testing is completed, the motor can be triggered to wind the rope, so that the platform truck returns to the tail of the link to prepare for the measurement of the next measuring point.

Description

A road springback deflection detection device based on Beckman beam method and using method

technical field

The invention relates to a road rebound deflection detection device based on the Beckman beam method in the technical field of municipal engineering detection equipment and a use method thereof.

Background technique

Road deflection detection is an important indicator for the detection of road construction quality and bearing capacity during operation. The qualified bearing capacity reflects the qualified construction quality and also means the safe operation of the road. At present, the Beckman beam method for detecting road springback and deflection is still an important method in road design and construction in my country and even in the world.

At present, the Beckman beam method is generally used for road engineering rebound and deflection detection. In the tested road section, the detection frequency is 1 point/(20m per lane). The equipment used is composed of Beckman beams, dial indicators and watch frames, and is tested with a standard test vehicle with a single rear axle and a single side double wheel set that meets the specifications. The Beckman beam is a straight aluminum alloy beam, the middle part is hinged with the support, the length ratio of the forearm and the rear arm is 2:1, the front end touches the ground and the rear end is connected with the dial indicator. At the beginning of the experiment, the front end of the Beckman beam was inserted 30 to 50 mm from the front end of the gap between the double rear wheels on one side of the test vehicle. Then the experimenter drove the test car to 3 meters away, and another experimenter recorded the maximum value L ₁ and the stable value L ₂ of the dial indicator, and obtained the calculation formula L=2*|L ₂ -L ₁ | according to the standard specification The springback deflection value of the measuring point. In the actual test, due to the multi-lane road, the test vehicle with a single rear axle and a single-sided dual-wheel set can walk in the middle of two adjacent lanes, and the single-sided dual-wheel set can be driven in one lane respectively, so that two can be used at the same time. For Beckman beams, the deflection detection of two lanes is carried out, which further improves the detection efficiency relatively.

However, the testing process is cumbersome and requires multiple people to work together at the same time. During the experiment, one person was required to drive the standard loading vehicle, four persons were divided into two groups, and two Beckman beams were inserted into the gap between the rear wheels of the vehicle at each measuring point respectively. One person is required to direct the loading vehicle, so to complete the deflection value detection requires eight people to work together, which is not only inefficient but also wastes a lot of manpower. Moreover, the Beckman beam is several meters long. When multiple measuring points need to be measured, multiple people are required to carry it together, which further increases the labor burden of the testing process.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a road rebound deflection detection device based on the Beckman beam method and its use method, which can reduce the labor burden of the experimenter.

According to an embodiment of the first aspect of the present invention, there is provided a road rebound deflection detection device based on the Beckman beam method, including:

a connecting frame, which is used to be installed at the rear of the test vehicle, and the connecting frame is provided with a fixed pulley;

A platform vehicle with a plurality of rollers at the bottom;

The Beckman beam is hinged with the platform vehicle, and the ratio of the distance between the hinge point and the front end and the rear end of the Beckman beam is 2:1, the front end of the Beckman beam can be in contact with the ground, and the A dial indicator is installed at the rear end, and the probe of the dial indicator is in contact with the ground;

A sliding assembly includes a sliding block and a support rod, the sliding block is slidably connected with the platform vehicle, the supporting rod is mounted on the sliding block, and one end of the supporting rod can be in contact with the Beckman beam and jacking up the Beckman beam;

a traction assembly, which includes a motor, a contact switch and a rope, the motor is electrically connected to the contact switch, the contact switch is arranged at the front end of the stroke of the slider and can be triggered by the slider, the rope bypasses Both ends of the fixed pulley and the rope are respectively connected to the output shaft of the motor and the slider.

According to the embodiment of the first aspect of the present invention, further, a guide frame is further provided at the tail of the connecting frame, and the guide frame includes two C-shaped steels, and the grooves of the two C-shaped steels are arranged oppositely; the sliding assembly is further It includes a T-shaped frame, the T-shaped frame is installed on the slider, the end of the T-shaped frame is provided with a cross bar, and the two ends of the cross bar can slide into the grooves of the two C-shaped steels respectively. Inside.

According to the embodiment of the first aspect of the present invention, further, the distance between the rear ends of the two C-shaped steels is greater than the distance between the front ends of the two C-shaped steels, and the distance between the front ends of the two C-shaped steels is equal to the length of the crossbar.

According to the embodiment of the first aspect of the present invention, further, the number of the cross bars is two, and the two cross bars are arranged in parallel and can both slide into the grooves of the C-shaped steel.

According to the embodiment of the first aspect of the present invention, further, the bottom of the Beckman beam is provided with a limit block, the surface of the limit block is wavy, the two ends of the limit block are protruding and the middle is concave, and one end of the support rod can slide into the recess of the limit block.

According to the embodiment of the first aspect of the present invention, further, the sliding assembly further includes a spring, two ends of the spring are respectively connected to the sliding block and the platform cart, and the spring provides the sliding block with a rearward direction driving force.

According to the embodiment of the first aspect of the present invention, further, the device for detecting road rebound and deflection based on the Beckman beam method further includes a cortical connecting belt, and both ends of the cortical connecting belt are respectively connected to the Beckman beams. Probe of the rear end and the dial indicator.

According to the embodiment of the first aspect of the present invention, further, the dial indicator is a digital display dial indicator.

According to the embodiment of the first aspect of the present invention, further, the road rebound deflection detection device based on the Beckman beam method further includes a numerical control device, and the numerical control device is electrically connected to the digital dial indicator for recording Experimental results.

According to an embodiment of the second aspect of the present invention, a method for using a road rebound deflection detection device based on the Beckman beam method is provided, including:

Connect the platform vehicle to the connecting frame through the rope, the connecting frame is installed at the rear of the test vehicle, wind the redundant rope on the output shaft of the motor, and adjust the Beckman beam position, so that the front end of the Beckman beam can extend into the rear wheel gap of the connecting frame;

Slide the slider to the rear end of its stroke, and the front end of the Beckman beam is in contact with the ground and is located on the measuring point 30-50mm in front of the double rear wheel clearance of the test vehicle;

Start the test vehicle and drive away in a straight line, drive the motor output shaft to rotate and release the rope wound on it, the dial indicator continuously records the reading, and obtains the maximum reading L ₁ ;

The test vehicle travels 3 meters away from the platform vehicle, the ropes are all released, read the stable value L ₂ of the dial indicator, and the road rebound deflection value L=2*|L ₂ -L ₁ |;

The test vehicle continues to drive, the sliding block is pulled forward by the rope, and the support rod is in contact with the Beckman beam and pushes the front end of the Beckman beam off the ground;

The slider moves to the front end of its stroke and triggers the contact switch, the motor starts and the rope is wound and recovered, and the platform car gradually approaches the connecting frame until the platform car and the Connecting frame tail contact;

The test car brakes, the slider and the connecting frame are relatively stationary, and the platform car moves forward due to inertia, and the Beckman beam moves forward relative to the support rod, and the Beckman beam moves forward. The front end is in contact with the ground again, the contact switch is out of contact with the slider, and the contact switch is reset;

The test vehicle continues to drive, drives the motor output shaft to rotate and releases the rope wound on it, and the dial indicator records the deflection change reading of this road section;

The above steps are repeated to obtain road springback and deflection values of multiple measuring points, and the detection ends.

The beneficial effects of the embodiments of the present invention include: in the present invention, the Beckman beam is loaded by the platform vehicle, and the platform vehicle can be driven to move when the connecting frame moves, thereby reducing the labor burden when handling the measuring equipment; during the detection process, the connecting frame moves while the platform vehicle moves. Data collection is carried out by keeping the rope pay-off in place. After the detection is completed, the motor can be triggered to wind the rope, so that the platform truck returns to the tail of the connecting frame to prepare for the measurement of the next measuring point.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly describes the accompanying drawings that are used in the description of the embodiments. Obviously, the described drawings are only a part of the embodiments of the present invention, but not all of the embodiments, and those skilled in the art can obtain other design solutions and drawings according to these drawings without creative work.

1 is a side view of an embodiment of a first aspect of the present invention;

Fig. 2 is the top view of the embodiment of the first aspect of the present invention;

Fig. 3 is a partial enlarged view of the connecting frame in the embodiment of the first aspect of the present invention.

Detailed ways

This part will describe the specific embodiments of the present invention in detail, and the preferred embodiments of the present invention are shown in the accompanying drawings. Each technical feature and overall technical solution of the invention should not be construed as limiting the protection scope of the invention.

In the description of the present invention, it should be understood that the azimuth description, such as the azimuth or position relationship indicated by up, down, front, rear, left, right, etc., is based on the azimuth or position relationship shown in the drawings, only In order to facilitate the description of the present invention and simplify the description, it is not indicated or implied that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including this number, above, below, within, etc. are understood as including this number. If it is described that the first and the second are only for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance, or indicating the number of the indicated technical features or the order of the indicated technical features. relation.

In the description of the present invention, unless otherwise clearly defined, terms such as setting, installation, and connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

Referring to FIGS. 1 to 2 , the road rebound deflection detection device based on the Beckman beam method in the embodiment of the first aspect of the present invention includes a connecting frame 1 , a platform vehicle 2 , a Beckman beam 3 , a dial indicator 4 , and a sliding Assembly 5 and Traction Assembly 6. The connecting frame 1 is a component connected to the test vehicle, the test vehicle is a vehicle loaded with rated counterweight, and its rear axle is a double-sided 4-wheel structure, and the Beckman beam 3 is inserted into the gap between the two rear wheels on the same side for testing. , because it is close to the pressure point of the road surface, a more accurate road rebound deflection value can be measured. The platform vehicle 2 is a flatbed vehicle, and a plurality of rollers 21 are provided at the bottom to improve the mobility of the platform vehicle. The Beckman beam 3 is hinged on the platform vehicle 2, and the length ratio of the front end and the rear end to the hinged position is 2:1, and the front end of the beam can be in contact with the ground to realize rebound deflection detection. The rear end of the Beckman beam 3 is installed with a percent In Table 4, the probe of dial indicator 4 is in contact with the ground, and the rebound deflection value of the measuring point can be obtained by reading the change of the reading on dial indicator 4.

The sliding assembly 5 includes a sliding block 51 and a supporting rod 52. The sliding block 51 is slidably connected to the platform vehicle 2. The supporting rod 52 is installed on the sliding block 51, which is inclined forward and has an angle of 10° to 20° with the ground. One end of 52 is provided with a T-shaped cross bar, which can contact with the Beckman beam 3 and lift it up. The traction assembly 6 includes a motor 61, a contact switch 62 and a rope 63. The motor 61 is electrically connected to the contact switch 62. The contact switch 62 is arranged at the front end of the stroke of the slider 51 and can be contacted and triggered by the slider 51. The two ends of the rope 63 are respectively It is connected to the output shaft of the motor 61 and the slider 51, and the rope 63 is wound around the fixed pulley preset at the tail of the connecting frame 1. When the motor 61 starts and winds the rope 63, it can drive the platform vehicle 2 to move forward. Specifically, the output shaft of the motor 61 can also be externally connected to a reel, and the rope 63 is wound on the reel. The reel is provided with a side baffle to prevent the rope 63 from leaking outside the reel.

At the beginning of the measurement, the slider 51 is at the rear end of its stroke, the support rod 52 is not in contact with the Beckman beam 3 , and the front end of the Beckman beam 3 is in contact with the ground. When the connecting frame 1 drives away from the platform vehicle 2, the output shaft on the motor 61 rotates passively, the rope 63 is released, and the dial indicator 4 continuously records the value change to obtain deflection data. When the rope 63 is completely released, the connecting frame 1 will continue to drive the slider 51 to move forward, and the support rod 52 will move along with it and push up the Beckman beam 3 to prevent the Beckman beam 3 from causing damage to the Beckman beam 3 when the subsequent platform vehicle 2 starts to move. hinder. When the slider 51 reaches the front end of its stroke, the contact switch 62 is triggered, the motor 61 starts and starts to wind the rope 63 , and the platform cart 2 gradually approaches the connecting frame 1 until it returns to the tail of the connecting frame 1 . Therefore, when the measurement of multiple measuring points is performed, it is not necessary for the experimenter to manually carry the equipment, which can greatly reduce the labor intensity of the experimenter.

Further, the tail of the connecting frame 1 is also provided with a guide frame 12 . Referring to FIG. 3 , the guide frame 12 includes two C-shaped steels 121 , and the grooves of the two C-shaped steels 121 are arranged oppositely. The sliding assembly 5 also includes a T-shaped frame 53, which is connected with the slider 51, and a cross bar 531 is provided at the end of the T-shaped frame 53, and the two ends of the cross bar 531 can slide into the grooves of the two C-shaped steels 121 respectively. Inside, the connection between the T-shaped frame 53 and the guide frame 12 is realized. Specifically, in order to facilitate the sliding of the cross bar 531 , the two C-shaped steels 121 are inclined downward, and the T-shaped frame 53 is hinged with the slider 51 .

Further, the distance between the two C-shaped steels 121 at the rear end is greater than the distance between the two C-shaped steels 121 at the front end, the rear ends are separated from each other, and the front ends are retracted to the same distance as the length of the cross bar 531 in order to fix the T-shaped frame 53 and prevent it. Shake left and right. That is, the openings at the rear ends of the two C-shaped steels 121 are opened obliquely, and when the T-shaped frame 53 is offset, the T-shaped frame 53 can be guided to enter and connect with it. The distance between the front ends of the two C-shaped steels 121 is equal to the length of the crossbar 531 , which reduces the lateral swing of the crossbar 531 when it reaches the front end of the C-shaped steel 121 .

Further, the number of the cross bars 531 is two, and the two cross bars 531 are arranged parallel to each other and can both slide into the grooves of the C-shaped steel 121, and the two cross bars 531 abut against the grooves of the C-shaped steel 121 at the same time, The swing of the T-frame 53 is reduced, thereby reducing the swing of the platform vehicle 2 .

Further, the bottom of the Beckman beam 3 is provided with a limit block 31, one side of which is bonded to the Beckman beam 3, and the surface of the other side is wavy. One end can be scratched over its projection and slipped into the dimple. Therefore, when the support rod 52 lifts the Beckman beam 3 and slides into the pit, the Beckman beam 3 can form a more stable support effect, preventing the support rod 52 from loosening from the Beckman beam 3 when the test vehicle suddenly accelerates or decelerates. The Beckman beam 3 was erroneously placed at the non-measuring point position.

Further, the sliding assembly 5 also includes a spring 54, two ends of the spring 54 are respectively connected to the slider 51 and the platform vehicle 2, which are in a stretched state, and apply a backward driving force to the slider 51 to prevent the test vehicle from suddenly accelerating When the speed of the output shaft of the motor 61 is not synchronized with the acceleration of the test vehicle, the acceleration of the test vehicle may be slower than that of the test vehicle, which may cause a forward pulling force on the slider 51 through the rope 63, thereby starting the motor 61 at the wrong time. Take up the line.

Further, the road rebound and deflection detection device based on the Beckman beam method also includes a cortical connecting belt 7, the two ends of which are respectively connected to the rear end of the Beckman beam 3 and the measuring head of the dial indicator 4, which is cushioned on the measuring head. Below the head, to prevent the ground friction from causing damage to the probe when the platform cart 2 moves.

Further, the dial indicator 4 is a digital dial indicator, which displays the reading through the display screen, which is convenient for data recording and can improve the accuracy of the reading.

Further, the road springback and deflection detection device based on the Beckman beam method also includes a numerical control device 8, which is electrically connected to the digital dial indicator, and can directly obtain and record the measurement data, which is convenient for the later detection of multiple measurement points. The measurement data is processed uniformly to improve the efficiency of data processing. Specifically, the numerical control device 8 is fixed at the back end of the Beckman beam 3, and is connected to the digital dial indicator through a data cable. The programming software on the computer is used to read the dial indicator data every 0.1s and store it. The analysis calculates the deflection value. When the test vehicle reaches the measuring point, the stop state lasts for at least 5s, and the dial indicator does not change at this time, which can be used as the starting point for the program software to calculate and extract the data. When the test car is started, the dial indicator data changes during the process of moving forward. It usually takes 0.5min until it walks out of the measuring point 3m. The software program should be set to analyze and record the data within 0.5min, and extract the minimum and maximum values. It is then calculated and stored according to the specification. Before each inspection, the starting and ending stakes of the detected road section should be input on the numerical control device 8, and then in sequence, every 20m, and the code given to this data is the product of the starting stake and the number of inspections and 20. Or the terminal station number minus the product of the number of detections and 20, as the position station number of the measuring point for positioning.

A method for using a road rebound deflection detection device based on the Beckman beam method in the embodiment of the second aspect of the present invention includes the following steps:

S1. Connect the connecting frame 1 to the test vehicle, and connect the platform vehicle 2 to the connecting frame 1 through the rope 63, specifically by passing the rope 63 around the fixed pulley 11 at the rear of the connecting frame 1, and connecting one end of the rope 63 to the slider 51 Connect, wind the redundant rope 63 on the output shaft of the motor 61, adjust the position of the Beckman beam 3 so that the front end of the Beckman beam 3 can extend into the rear wheel gap of the connecting frame 1, and make the Beckman beam 3 The position of contact with the ground is located at the measuring point 30-50mm in front of the double rear wheel clearance;

S2. Slide the slider 51 to the rear end of its stroke, and the front end of the Beckman beam 3 is in contact with the ground;

S3. Start the test car and drive away in a straight line. The speed of the vehicle is kept at 4-6km/h, and the output shaft of the motor 61 is driven to rotate and release the rope 63 wound on it. The reading of the dial indicator 4 changes, and the maximum value L of the reading is recorded. ₁ ;

S4. The test vehicle drives 3 meters away from the platform vehicle 2, and it is considered that the test vehicle has left the detection area, the ropes 63 are all released, the reading of the dial indicator 4 tends to be stable, and the stable value L ₂ at this time is recorded. Rebound deflection value L=2*|L ₂ -L ₁ |;

S5. The test vehicle continues to drive, pulls the slider 51 forward through the rope 63, and the support rod 52 contacts the Beckman beam 3 and pushes the front end of the Beckman beam 3 off the ground;

S6. The slider 51 moves to the front end of its stroke and triggers the contact switch 62, the motor 61 starts and the rope 63 is wound and reeled, and the platform car 2 is gradually approached to the connecting frame 1 until the platform car 2 is in contact with the tail of the connecting frame 1;

S7. The test vehicle brakes after reaching the next measuring point, the slider 51 is in contact with the connecting frame 1 and thus remains relatively stationary, while the platform vehicle 2 moves forward due to inertia, and the Beckman beam 3 moves forward relative to the support rod 52 and Finally, the two are separated from each other, and the front end of Beckman beam 3 is in contact with the ground again;

S8. The test vehicle continues to drive, drives the output shaft of the motor 61 to rotate and releases the rope 63 wound on it, and the dial indicator 4 records the deflection change reading of this road section, and the reading method is consistent with steps S3 to S4;

S9. The above steps are repeated to obtain road rebound and deflection values of multiple measuring points, and the detection ends.

Specifically, in some embodiments, when the test vehicle travels to a distance of 19 meters from the platform vehicle 2, the ropes 63 are all released, the motor 61 is driven to start to take up the wire, and the wire is completed at another measuring point at 20 meters. , to check the next measuring point. In other embodiments, when the test vehicle travels to a place 3 meters away from the platform vehicle 2 , the ropes 63 are all released and begin to take up the wire. The connection frame 1 is provided with an induction switch, which is electrically connected to the motor 61 . , when the platform car 2 is docked with the connecting frame 1, the induction switch can stop the motor 61 and continue to take up the wire, and the test car carries the platform car 2 to the next measuring point for testing.

The preferred embodiments of the present invention have been specifically described above, but the invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. , these equivalent modifications or substitutions are all included within the scope defined by the claims of the present application.

Claims (10)

1. a road rebound deflection detection device based on Beckman beam method, is characterized in that, comprises: a connecting frame (1), which is used to be installed at the rear of the test vehicle, the connecting frame (1) is provided with a fixed pulley (11); a platform vehicle (2), the bottom of which is provided with a plurality of rollers (21); The Beckman beam (3) is hinged with the platform vehicle (2), and the ratio of the distance between the hinge point and the front end and the rear end of the Beckman beam (3) is 2:1, and the The front end can be in contact with the ground, a dial indicator (4) is installed at the rear end of the Beckman beam (3), and the probe of the dial indicator (4) is in contact with the ground; A sliding assembly (5) includes a sliding block (51) and a support rod (52), the sliding block (51) is slidably connected with the platform vehicle (2), and the support rod (52) is installed on the sliding block (52). On the block (51), one end of the support rod (52) can contact the Beckman beam (3) and lift the Beckman beam (3); A traction assembly (6) includes a motor (61), a contact switch (62) and a rope (63), the motor (61) is electrically connected with the contact switch (62), and the contact switch (62) is arranged on the The front end of the stroke of the slider (51) and can be triggered by the slider (51), the rope (63) goes around the fixed pulley (11) and the two ends of the rope (63) are respectively connected to The output shaft of the motor (61) and the slider (51). 2. The road rebound deflection detection device based on the Beckman beam method according to claim 1, characterized in that: a guide frame (12) is also provided at the tail of the connecting frame (1), and the guide frame (12) ) comprises two C-shaped steels (121), the grooves of the two C-shaped steels (121) are arranged oppositely; the sliding assembly (5) also includes a T-shaped frame (53), and the T-shaped frame (53) is installed In the slider (51), the end of the T-shaped frame (53) is provided with a cross bar (531), and the two ends of the cross bar (531) can be respectively slid into the two C-shaped steels (121). ) in the groove. 3. The road rebound deflection detection device based on the Beckman beam method according to claim 2, characterized in that: the distance between the rear ends of the two C-shaped steels (121) is greater than that of the two C-shaped steels (121) The distance between the front ends of the two C-shaped steels (121) is equal to the length of the cross bar (531). 4. The road rebound deflection detection device based on the Beckman beam method according to claim 2, wherein the number of the cross bars (531) is two, and the two cross bars (531) are parallel It is arranged and can be slid into the groove of the C-shaped steel (121). 5. The road rebound deflection detection device based on the Beckman beam method according to claim 1, characterized in that: a limit block (31) is provided at the bottom of the Beckman beam (3), and the limit block ( 31) The surface is wavy, with both ends protruding and the middle concave, and one end of the support rod (52) can slide into the recess of the limiting block (31). 6 . The road rebound deflection detection device based on the Beckman beam method according to claim 1 , wherein the sliding assembly ( 5 ) further comprises a spring ( 54 ), two ends of the spring ( 54 ). Connected to the slider (51) and the platform cart (2), respectively, the spring (54) provides a backward driving force to the slider (51). 7. The road rebound deflection detection device based on the Beckman beam method according to claim 1, is characterized in that: the road rebound deflection detection device based on the Beckman beam method also comprises a cortical connecting belt (7) , the two ends of the cortical connecting belt (7) are respectively connected to the rear end of the Beckman beam (3) and the measuring head of the dial indicator (4). 8 . The road rebound deflection detection device based on the Beckman beam method according to claim 1 , wherein the dial indicator (4) is a digital dial indicator. 9 . 9. The road rebound deflection detection device based on the Beckman beam method according to claim 8, is characterized in that: the road rebound deflection detection device based on the Beckman beam method further comprises numerical control equipment (8), The numerical control device (8) is electrically connected to the digital dial indicator for recording experimental results. 10. A method of using the road rebound deflection detection device based on the Beckman beam method, is characterized in that, comprising: The platform vehicle (2) is connected to the connecting frame (1) through the rope (63), the connecting frame (1) is installed at the rear of the test vehicle, and the redundant rope (63) is wound On the output shaft of the motor (61), adjust the position of the Beckman beam (3) so that the front end of the Beckman beam (3) can extend into the rear wheel gap of the connecting frame (1); Slide the slider (51) to the rear end of its stroke, and the front end of the Beckman beam (3) is in contact with the ground and is located on the measuring point 30-50mm in front of the double rear wheel clearance of the test vehicle; Start the test vehicle and drive away in a straight line, drive the output shaft of the motor (61) to rotate and release the rope (63) wound on it, the dial indicator (4) continues to record the reading, and the maximum reading is obtained value L ₁ ; The test vehicle travels 3 meters away from the platform vehicle (2), the ropes (63) are all released, and the stable value L ₂ of the dial indicator (4) and the road rebound and deflection value are read. L=2*|L ₂ -L ₁ |; The test vehicle continues to drive, the sliding block (51) is pulled forward by the rope (63), and the support rod (52) contacts the Beckman beam (3) and pushes the Beckman beam to move forward. (3) The front end is lifted off the ground; The sliding block (51) moves to the front end of its stroke and triggers the contact switch (62), the motor (61) is activated and the rope (63) is wound and recovered, and the platform vehicle (2) is directed toward the contact switch (62). The connecting frame (1) is gradually approached until the platform vehicle (2) is in contact with the tail of the connecting frame (1); When the test vehicle brakes, the slider (51) and the connecting frame (1) are relatively stationary, while the platform vehicle (2) moves forward due to inertia, and the Beckman beam (3) is relative to the The support rod (52) moves forward, the front end of the Beckman beam (3) is in contact with the ground again, the contact switch (62) is out of contact with the slider (51), and the contact switch (62) is reset ; The test vehicle continues to drive, drives the output shaft of the motor (61) to rotate and releases the rope (63) wound thereon, and the dial indicator (4) records the deflection change reading of this road section; The above steps are repeated to obtain road springback and deflection values of multiple measuring points, and the detection ends.

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