CN115198603A

CN115198603A - Road surface flatness detection device

Info

Publication number: CN115198603A
Application number: CN202210831780.9A
Authority: CN
Inventors: 李�杰; 尚亚军; 张瑞玲; 张坤; 吴俊红; 刘彦玲
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-07-15
Filing date: 2022-07-15
Publication date: 2022-10-18

Abstract

The utility model belongs to the technical field of levelness detection device and specifically relates to a road flatness detection device is related to, and it includes three meters ruler, still include along three meters ruler length direction set up in guide rail, the sliding connection of its lateral wall in the casing of guide rail, set up in the dial plate of outer wall top surface of the housing, rotate connect in the first pointer of dial plate, along three meters ruler direction of height sliding connection in connecting rod, the fixed mounting of casing in the butt joint wheel of connecting rod bottom, set up in the connecting rod with be used for the drive between the first pointer the rotatory drive assembly of first pointer. This application has the effect that promotes detection efficiency, ensures to detect the precision.

Description

Road surface flatness detection device

Technical Field

The application relates to the field of levelness detection devices, in particular to a road surface evenness detection device.

Background

The measurement of the pavement evenness is an important detection item in the acceptance of road and bridge construction, and the measurement of the longitudinal concave-convex amount of the pavement is mainly carried out by an instrument to reflect the smoothness of the longitudinal section of the pavement, which is related to the comfort and safety of driving.

The detection equipment for the pavement evenness is divided into a section type and a reaction type. The section equipment is an instrument for measuring the convex-concave condition of the surface of a road, such as the most commonly used three-meter straight ruler and continuous flatness meter. The international flatness index (IRI) is established on the basis of the index, and is the most basic index of flatness.

The three-meter ruler measurement method comprises two kinds of single ruler maximum gap measurement and equidistant (1.5 m) continuous measurement, wherein the three-meter ruler measurement is commonly used for quality control and inspection acceptance during construction, and the qualification rate of a measurement section is calculated during single ruler measurement. The equidistant continuous test can also be used for checking and accepting construction quality, but the standard deviation is calculated and used for expressing the flatness degree.

The three meter ruler measures the maximum clearance of the foot from the road surface to indicate the flatness of the road surface in mm. The method is suitable for measuring the flatness of each layer of compacted pavement surface, so as to evaluate the construction quality and the service quality of the pavement. It can also be used for the construction flatness detection after the roadbed surface is formed.

In view of the above-mentioned related technologies, the inventor believes that, when the measurement is performed by using the three-meter ruler method, a worker needs to visually observe the gap between the three-meter ruler and the ground to determine the maximum gap position.

Disclosure of Invention

In order to promote the detection efficiency to the road flatness, ensure to detect the precision, this application provides a road flatness detection device.

The application provides a road flatness detection device adopts following technical scheme:

the utility model provides a road flatness detection device, includes three meters ruler, still include along three meters ruler length direction set up in guide rail, the sliding connection of its lateral wall in the casing of guide rail, set up in the dial plate of casing outer wall top surface, rotate connect in the first pointer of dial plate, along three meters ruler direction of height sliding connection in connecting rod, the fixed mounting of casing in the butt joint wheel of connecting rod bottom, set up in the connecting rod with be used for the drive between the first pointer the rotatory drive assembly of first pointer.

Preferably, the transmission assembly includes the edge three meters ruler width direction sets up and rotate and connect in shells inner wall's fixed axle, coaxial fixed connection in the drive gear of fixed axle, set up in the casing and mesh in drive gear's drive rack, fixed connection in the connecting rod with bracing piece, coaxial fixed connection between the drive rack in the drive bevel gear of fixed axle, connect in the drive mechanism of first pointer, shells inner wall seted up communicate in the perforation of dial plate, first pointer tip be equipped with rotate connect in the perforation in the axle sleeve, drive mechanism including rotate connect in shells inner wall top surface and with the coaxial driven bevel gear of axle sleeve, set up in the axle sleeve with one-way driving medium between the driven bevel gear, driven bevel gear mesh in the drive bevel gear, shells inner wall seted up with the coaxial first spacing annular of driven bevel gear, the coaxial fixed connection of driven bevel gear terminal surface rotate connect in the first connecting ring in the first spacing annular, first spacing annular cross-section with first connecting ring cross-section is the T type.

Preferably, driven bevel gear has the centre bore, one-way driving medium include coaxial fixed connection in the axle sleeve just is located the rolling disc in the centre bore, set up in the wedge groove of rolling disc perisporium, set up in transmission ball, the fixed connection in the wedge inslot inner wall just contradict in the spring leaf of transmission ball, the wedge groove degree of depth winds the rolling disc circumference deepens gradually, the spring leaf is located the darker one end of wedge groove, be equipped with the damping piece that is used for injecing the axle sleeve pivoted position in the casing.

Preferably, a second pointer is rotatably arranged on the dial plate, a transmission shaft penetrating through the shaft sleeve and rotatably connected to the bottom surface of the inner wall of the shell at the bottom end is arranged at the end part of the second pointer, a transmission mechanism is arranged between the transmission shaft and the driving bevel gear, two groups of transmission mechanisms respectively connected to the transmission shaft and the shaft sleeve are of mirror image structures, and the transmission directions of the one-way transmission pieces in the two groups of transmission mechanisms are the same.

Preferably, the outer wall of the shaft sleeve is fixedly connected with a first sliding rail which extends annularly around the circumference of the shaft sleeve and has a T-shaped section, the end part of the first pointer is connected with the first sliding rail in a sliding manner, the circumferential wall of the transmission shaft is fixedly connected with a second sliding rail which extends annularly around the circumference of the transmission shaft and has a T-shaped section, and the end part of the second pointer is connected with the second sliding rail in a sliding manner.

Preferably, the damping piece includes the conflict piece, is used for the drive conflict piece to be close to the adjustment mechanism of axle sleeve and transmission shaft, the conflict piece is close to one side of axle sleeve seted up respectively with the axle sleeve with first joint groove of transmission shaft matched with and second joint groove, the axle sleeve with the transmission shaft contradict respectively in first joint inslot wall and second joint inslot wall.

Preferably, adjustment mechanism is including seting up in the through-hole of casing lateral wall, along horizontal direction sliding connection in carriage release lever in the through-hole, rotate connect in casing outer wall and threaded connection in the drive ring of carriage release lever, to touch multitouch fixed connection in the carriage release lever is located one end in the casing, the spacing groove that extends along its length direction is seted up to the carriage release lever, through-hole inner wall fixedly connected with sliding connection in the stopper of spacing inslot, the casing outer wall seted up with the spacing annular of the coaxial second of drive ring, the coaxial fixedly connected with of drive ring terminal surface rotate connect in the spacing annular of second go-between, the spacing annular cross-section of second with second go-between cross-section is the T type.

Preferably, the connecting rods are at least two, the connecting rods are located the same fixedly connected with mounting plate of the outside one end of the shell, the butt wheels are installed on the mounting plate, the connecting rods are located the end face in the shell is provided with inserting grooves extending along the length direction of the connecting rods, the shell top face is fixedly connected with guide rods which are inserted in the inserting grooves in a one-to-one sliding mode, the opening ends of the inner walls of the inserting grooves are fixedly connected with first limiting rings, the guide rods are located the second limiting rings fixedly connected with one ends of the inserting grooves, a first reset spring sleeved on the guide rods is arranged between the first limiting rings and the second limiting rings, and a second reset spring is arranged between the end portions of the guide rods and the bottom face of the inserting grooves.

Preferably, a positioning block is fixedly connected to the dial plate, and the first pointer and the second pointer point to zero scale marks when abutting against the positioning block.

Preferably, the three-meter ruler comprises a first ruler body and a second ruler body, the end parts of the first ruler body and the second ruler body are hinged to each other, and the guide rail is divided into two sections and is respectively arranged on the first ruler body and the second ruler body.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the flatness of the pavement is tested, the three-meter ruler is placed at a proper position on the pavement, the shell is made to move along the length direction of the three-meter ruler by sliding the shell, the butting wheels butted on the pavement push the connecting rod to move in the height direction of the three-meter ruler under the concave-convex change of the pavement, and under the coordination of the driving rack and the driving gear, the driving bevel gear is driven to rotate by the fixed shaft;

2. before the next detection is prepared, the first pointer and the second pointer are conveniently rotated to enable the first pointer and the second pointer to be respectively abutted against the positioning block for zeroing, so that the staff can conveniently observe the next detection;

3. when the pressure on the shaft sleeve and the transmission shaft needs to be adjusted, a worker rotates the driving ring to enable the movable rod in threaded connection with the inner wall of the driving ring to move along the horizontal direction under the matching of the limiting groove and the limiting block, so that the contact blocks pressed on the surfaces of the shaft sleeve and the transmission shaft are enabled to adjust the pressure between the shaft sleeve and the transmission shaft;

4. through setting up wedge groove, transmission ball and the cooperation of spring plate, when driven bevel gear and rolling disc carry out one-way transmission, through the frictional force of transmission ball with the centre bore inner wall, can be faster drive the rolling disc, reduce the stroke of driven bevel gear idle running to promote first pointer or second pointer wobbling precision.

Drawings

Fig. 1 is an overall structural schematic diagram of the present embodiment.

Fig. 2 is a partially enlarged view of a portion a in fig. 1.

Fig. 3 is a sectional view of the inside of the housing in this embodiment.

Fig. 4 is a sectional view of the inside of the housing in the present embodiment.

FIG. 5 is a cross-sectional view of the one-way transmission of this embodiment.

Fig. 6 is a partially enlarged view of a portion B in fig. 3.

Fig. 7 is a partially enlarged view of a portion C in fig. 3.

Description of reference numerals: 1. three meters of a straightedge; 2. a guide rail; 3. a housing; 4. a dial plate; 5. a first pointer; 6. a second pointer; 7. a connecting rod; 8. a butting wheel; 9. a transmission assembly; 10. a first rule body; 11. a second ruler body; 12. mounting a plate; 13. inserting grooves; 14. a guide bar; 15. a first limit ring; 16. a second stop collar; 17. a first return spring; 18. a second return spring; 19. a fixed shaft; 20. a drive gear; 21. a drive rack; 22. a support bar; 23. a drive bevel gear; 24. a transmission mechanism; 25. perforating; 26. a shaft sleeve; 27. a drive shaft; 28. a first slide rail; 29. a second slide rail; 30. positioning blocks; 31. a driven bevel gear; 32. a one-way transmission member; 33. a first limit ring groove; 34. a first connecting ring; 35. a central bore; 36. rotating the disc; 37. a wedge-shaped groove; 38. a drive ball; 39. a spring plate; 40. a damping member; 41. a contact block; 42. an adjustment mechanism; 43. a first clamping groove; 44. a second clamping groove; 45. a through hole; 46. a travel bar; 47. a drive ring; 48. a limiting groove; 49. a limiting block; 50. a second limit ring groove; 51. a second connecting ring.

Detailed Description

The present application is described in further detail below with reference to figures 1-7.

The embodiment of the application discloses road surface roughness detection device. Referring to fig. 1-7, a pavement evenness detection apparatus comprises a three-meter ruler 1, a guide rail 2 arranged on a side wall of the three-meter ruler in the length direction of the three-meter ruler 1, a housing 3 slidably connected to the guide rail 2, a dial 4 arranged on the top surface of the outer wall of the housing 3, a first pointer 5 and a second pointer 6 rotatably connected to the dial 4, a connecting rod 7 slidably connected to the housing 3 in the height direction of the three-meter ruler 1, a butting wheel 8 fixedly mounted at the bottom end of the connecting rod 7, and a transmission assembly 9 arranged between the connecting rod 7 and the first pointer 5 and used for driving the first pointer 5 and the second pointer 6 to rotate.

Wherein, three meters ruler 1 includes the mutual articulated first chi body 10 of tip and second chi body 11, and guide rail 2 prefers to set up to T type guide rail 2, and guide rail 2 divide into two sections and set up respectively in first chi body 10 and second chi body 11, and connecting rod 7 is equipped with two, and slides respectively and pegs graft in the both sides of casing 3 bottom, and connecting rod 7 is located the outside one end of casing 3 and is connected with mounting panel 12 jointly fixedly, and butt joint wheel 8 is installed in mounting panel 12 bottom surface.

For making the butt joint wheel 8 can support tightly in the road surface all the time, connecting rod 7 is located the inside terminal surface of casing 3 and sets up the inserting groove 13 that extends along its length direction, 3 top surface fixedly connected with one-to-one of casing slides guide bar 14 of pegging graft in inserting

groove

13, 13 inner wall open end fixedly connected with of inserting groove 15, guide bar 14 is located the one end fixedly connected with second spacing ring 16 of inserting groove 13, be equipped with the first reset spring 17 that the guide bar 14 was located to the cover between first spacing ring 15 and the second spacing ring 16, be equipped with second reset spring 18 between 14 tip of guide bar and the 13 bottom surfaces of inserting groove.

The transmission assembly 9 comprises a fixing shaft 19 which is arranged along the width direction of the three-meter ruler 1 and is rotatably connected to the inner wall of the shell 3, a driving gear 20 which is coaxially and fixedly connected to the fixing shaft 19, a driving rack 21 which is arranged in the shell 3 and is meshed with the driving gear 20, a supporting rod 22 which is fixedly connected between the connecting rod 7 and the driving rack 21, a driving bevel gear 23 which is coaxially and fixedly connected to the fixing shaft 19, and two groups of transmission mechanisms 24 which are respectively connected to the first pointer 5 and the second pointer 6.

Wherein, the top surface of the inner wall of the casing 3 is provided with a through hole 25 communicated with the dial 4, the end part of the first pointer 5 is provided with a shaft sleeve 26 rotatably connected in the through hole 25, the end part of the second pointer 6 is provided with a transmission shaft 27 penetrating the shaft sleeve 26 and rotatably connected with the bottom surface of the inner wall of the casing 3, the two groups of transmission mechanisms 24 are respectively connected with the shaft sleeve 26 and the transmission shaft 27, the two groups of transmission mechanisms 24 respectively connected with the transmission shaft 27 and the shaft sleeve 26 are of mirror image structures in the up-down direction, and the transmission directions of the unidirectional transmission pieces 32 in the two groups of transmission mechanisms 24 are the same.

In order to facilitate the zeroing of the first pointer 5 and the second pointer 6, a first sliding rail 28 which extends annularly around the outer wall of the shaft sleeve 26 and has a T-shaped section is fixedly connected to the outer wall of the shaft sleeve 26, the end of the first pointer 5 is slidably connected to the first sliding rail 28, a second sliding rail 29 which extends annularly around the outer wall of the transmission shaft 27 and has a T-shaped section is fixedly connected to the peripheral wall of the transmission shaft 27, and the end of the second pointer 6 is slidably connected to the second sliding rail 29. Wherein first pointer 5 is shorter than and second pointer 6, two locating pieces 30 of fixedly connected with on the dial plate 4, when first pointer 5 and second pointer 6 butt respectively in the locating piece 30 for corresponding, first pointer 5 and second pointer 6 all point to zero scale mark, and the staff is convenient for through rotating first pointer 5 and second pointer 6, make first pointer 5 and second pointer 6 butt respectively in locating piece 30 zero, and the staff of being convenient for observes when detecting next time.

The transmission mechanism 24 connected to the first pointer 5 includes a driven bevel gear 31 rotatably connected to the top surface of the inner wall of the housing 3 and coaxial with the shaft sleeve 26, and a one-way transmission member 32 disposed between the shaft sleeve 26 and the driven bevel gear 31, the driven bevel gear 31 is meshed with the driving bevel gear 23, a first limit ring 15 groove coaxial with the driven bevel gear 31 is formed in the inner wall of the housing 3, a first connecting ring 34 rotatably connected to the first limit ring 15 groove is coaxially and fixedly connected to the end surface of the driven bevel gear 31, and the cross sections of the first limit ring 15 groove and the first connecting ring 34 are both T-shaped.

The driven bevel gear 31 is provided with a central hole 35, the one-way transmission member 32 comprises a rotating disc 36 coaxially and fixedly connected to the shaft sleeve 26 and positioned in the central hole 35, a wedge-shaped groove 37 formed in the peripheral wall of the rotating disc 36, a transmission ball 38 arranged in the wedge-shaped groove 37, and a spring piece 39 fixedly connected to the inner wall of the wedge-shaped groove 37 and abutted against the transmission ball 38, the depth of the wedge-shaped groove 37 is gradually deepened around the circumferential direction of the rotating disc 36, and the spring piece 39 is positioned at the deeper end of the wedge-shaped groove 37.

Under the cooperation of the wedge-shaped groove 37, the transmission ball 38 and the spring piece 39, when the driven bevel gear 31 and the rotating disc 36 perform one-way transmission, the rotating disc 36 can be driven more quickly through the friction force between the transmission ball 38 and the inner wall of the central hole 35, the idle stroke of the driven bevel gear 31 is reduced, and therefore the swinging precision of the first pointer 5 or the second pointer 6 is improved

The damping piece 40 used for limiting the rotation position of the shaft sleeve 26 is arranged in the shell 3, the damping piece 40 comprises a contact block 41 and an adjusting mechanism 42 used for driving the contact block 41 to be close to the shaft sleeve 26 and the transmission shaft 27, a first clamping groove 43 and a second clamping groove 44 matched with the shaft sleeve 26 and the transmission shaft 27 are respectively formed in one side, close to the shaft sleeve 26, of the contact block 41, and the shaft sleeve 26 and the transmission shaft 27 are respectively abutted to the inner wall of the first clamping groove 43 and the inner wall of the second clamping groove 44.

The adjusting mechanism 42 includes a through hole 45 formed in the side wall of the housing 3, a moving rod 46 slidably connected in the through hole 45 along the horizontal direction, a driving ring 47 rotatably connected to the outer wall of the housing 3 and threadedly connected to the moving rod 46, a contact block 41 fixedly connected to one end of the moving rod 46 located in the housing 3, a limiting groove 48 extending along the length direction of the moving rod 46 is formed in the moving rod 46, a limiting block 49 slidably connected in the limiting groove 48 is fixedly connected to the inner wall of the through hole 45, a second limiting ring 16 groove coaxial with the driving ring 47 is formed in the outer wall of the housing 3, a second connecting ring 51 rotatably connected in the second limiting ring 16 groove is coaxially and fixedly connected to the end surface of the driving ring 47, and the groove cross section of the second limiting ring 16 and the cross section of the second connecting ring 51 are both T-shaped.

When the pressure on the shaft sleeve 26 and the transmission shaft 27 needs to be adjusted, a worker rotates the driving ring 47 to enable the moving rod 46 which is in threaded connection with the inner wall of the driving ring 47 to move in the horizontal direction under the matching of the limiting groove 48 and the limiting block 49, so that the abutting block 41 which is pressed on the surfaces of the shaft sleeve 26 and the transmission shaft 27 is enabled to adjust the pressure between the shaft sleeve 26 and the transmission shaft 27.

The implementation principle of the road flatness detection device in the embodiment of the application is as follows:

when the pavement evenness is tested, after the three-meter ruler 1 is placed at a proper position on a pavement, the shell 3 is made to move along the length direction of the three-meter ruler 1 by sliding the shell 3, the abutting wheels 8 abutting against the pavement push the connecting rods 7 to move in the height direction of the three-meter ruler 1 under the concave-convex change of the pavement, the driving bevel gear 23 is driven to rotate by the fixing shaft 19 under the matching of the driving rack 21 and the driving gear 20, the driven bevel gears 31 in the two groups of transmission mechanisms 24 respectively connected to the shaft sleeve 26 and the transmission shaft 27 synchronously rotate while the driving bevel gear 23 rotates, so that the first pointer 5 and the second pointer 6 are respectively driven to rotate, and under the matching of the one-way transmission piece 32 and the damping piece 40, when the driven bevel gears 31 rotate to the large end of the wedge-shaped groove 37, the transmission ball 38 is further moved to the large end of the wedge-shaped groove 37 under the action of friction force, therefore, the friction force between the rotating disc 36 and the inner wall of the central hole 35 is reduced, under the coordination of the damping piece 40, the driven bevel gear 31 cannot drive the rotating disc 36 to rotate, when the driven bevel gear 31 rotates to the small end facing the wedge-shaped groove 37, the inner wall of the central hole 35 drives the transmission ball 38 to move towards the small end of the wedge-shaped groove 37 through the friction force, under the condition that the transmission ball 38 is extruded, the friction force between the rotating disc 36 and the inner wall of the central hole 35 is increased, so that the driven bevel gear 31 can drive the rotating disc 36 to rotate, when the rotating disc 36 drives the first pointer 5 or the second pointer 6 to swing to the maximum amplitude, the position can be kept, so that a worker can observe scales of the dial 4, the maximum swing amplitude of the first pointer 5 is added with the maximum swing amplitude of the second pointer 6, namely the maximum gap of the section of the road surface, and the detection efficiency is improved, and the detection precision is improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a road flatness detection device, includes three meters ruler (1), its characterized in that: still include along three meters ruler (1) length direction set up in guide rail (2), the sliding connection of its lateral wall in casing (3) of guide rail (2), set up in dial plate (4) of casing (3) outer wall top surface, rotate connect in first pointer (5) of dial plate (4), along three meters ruler (1) direction of height sliding connection in connecting rod (7), the fixed mounting of casing (3) in butt wheel (8) of connecting rod (7) bottom, set up in connecting rod (7) with be used for the drive between first pointer (5) transmission assembly (9) that first pointer (5) are rotatory.

2. The road flatness detecting apparatus according to claim 1, wherein: the transmission assembly (9) comprises a fixed shaft (19) which is arranged along the width direction of the three-meter ruler (1) and is rotatably connected to the inner wall of a shell (3), a driving gear (20) coaxially and fixedly connected to the fixed shaft (19), a driving rack (21) which is arranged in the shell (3) and is meshed with the driving gear (20), a supporting rod (22) which is fixedly connected between the connecting rod (7) and the driving rack (21), a driving bevel gear (23) coaxially and fixedly connected to the fixed shaft (19), and a transmission mechanism (24) connected to the first pointer (5), wherein the inner wall of the shell (3) is provided with a through hole (25) communicated with the dial (4), the end part of the first pointer (5) is provided with a shaft sleeve (26) rotatably connected in the through hole (25), the transmission mechanism (24) comprises a driven bevel gear (31) which is rotatably connected to the top surface of the inner wall of the shell (3) and is coaxial with the shaft sleeve (26), and a one-way transmission piece (32) arranged between the shaft sleeve (26) and the driven bevel gear (31), the driven bevel gear (31) is meshed with the inner wall of the shell (3), and a first limit ring (15) of the driving bevel gear (31) is arranged on the inner wall of the shell (3), the end face of the driven bevel gear (31) is coaxially and fixedly connected with a first connecting ring (34) which is rotatably connected in the groove of the first limiting ring (15), and the section of the groove of the first limiting ring (15) and the section of the first connecting ring (34) are both T-shaped.

3. A road flatness detecting apparatus according to claim 2, wherein: driven bevel gear (31) has centre bore (35), one-way transmission spare (32) including coaxial fixed connection in axle sleeve (26) and being located rolling disc (36) in centre bore (35), set up in wedge groove (37) of rolling disc (36) perisporium, set up in drive ball (38), fixed connection in wedge groove (37) inner wall and conflict in spring leaf (39) of drive ball (38), wedge groove (37) degree of depth is around rolling disc (36) circumference deepens gradually, spring leaf (39) are located the darker one end of wedge groove (37), be equipped with in casing (3) and be used for injecing damping piece (40) of axle sleeve (26) turned position.

4. A road flatness detecting apparatus according to claim 3, wherein: dial plate (4) are gone up to rotate and are equipped with second pointer (6), second pointer (6) tip is equipped with and passes axle sleeve (26) and bottom rotate connect in transmission shaft (27) of casing (3) inner wall bottom surface, transmission shaft (27) with be equipped with drive mechanism (24) between drive bevel gear (23), connect respectively in two sets of drive mechanism (24) of transmission shaft (27) and axle sleeve (26) are mirror image structure, and the direction of transmission of unidirectional transmission spare (32) is the same in two sets of drive mechanism (24).

5. The road flatness detecting apparatus according to claim 4, wherein: the outer wall of the shaft sleeve (26) is fixedly connected with a first sliding rail (28) which extends annularly around the circumferential direction of the shaft sleeve and has a T-shaped section, the end part of the first pointer (5) is connected with the first sliding rail (28) in a sliding manner, the circumferential wall of the transmission shaft (27) is fixedly connected with a second sliding rail (29) which extends annularly around the circumferential direction of the transmission shaft and has a T-shaped section, and the end part of the second pointer (6) is connected with the second sliding rail (29) in a sliding manner.

6. The road flatness detecting apparatus according to claim 4, wherein: damping piece (40) are close to including contact block (41), be used for drive contact block (41) the adjustment mechanism (42) of axle sleeve (26) and transmission shaft (27), contact block (41) are close to one side of axle sleeve (26) seted up respectively with axle sleeve (26) with transmission shaft (27) matched with first joint groove (43) and second joint groove (44), axle sleeve (26) with transmission shaft (27) contradict respectively in first joint groove (43) inner wall and second joint groove (44) inner wall.

7. The road flatness detection device according to claim 6, wherein: adjusting mechanism (42) including set up in through-hole (45) of casing (3) lateral wall, along horizontal direction sliding connection in carriage release lever (46) in through-hole (45), rotate connect in casing (3) outer wall and threaded connection in drive ring (47) of carriage release lever (46), conflict piece (41) fixed connection in carriage release lever (46) is located the one end in casing (3), carriage release lever (46) are seted up along its length direction extension spacing groove (48), through-hole (45) inner wall fixedly connected with sliding connection in spacing block (49) in spacing groove (48), casing (3) outer wall seted up with the coaxial second spacing ring (16) groove of drive ring (47), the coaxial fixedly connected with of drive ring (47) terminal surface rotates connect in the second go-between (51) of second spacing ring (16) inslot, second spacing ring (16) groove cross-section with second go-between (51) cross-section is the T type.

8. The road flatness detecting apparatus according to claim 4, wherein: the connecting rod (7) is provided with at least two, the connecting rod (7) is located the outer one end of casing (3) is fixedly connected with mounting panel (12) altogether, butt joint wheel (8) install in mounting panel (12), connecting rod (7) are located terminal surface in casing (3) is seted up along inserting groove (13) that its length direction extends, casing (3) top surface fixedly connected with one-to-one slides and pegs graft in guide bar (14) in inserting groove (13), inserting groove (13) inner wall open end fixedly connected with first spacing ring (15), guide bar (14) are located one end fixedly connected with second spacing ring (16) in inserting groove (13), be equipped with between first spacing ring (15) and second spacing ring (16) and overlap and locate guide bar (14) first reset spring (17), be equipped with second reset spring (18) between guide bar (14) tip and inserting groove (13) bottom surface.

9. The road flatness detecting apparatus according to claim 5, wherein: the dial plate (4) is fixedly connected with a positioning block (30), and the first pointer (5) and the second pointer (6) are abutted against the positioning block (30) and point to zero scale marks.

10. The road flatness detecting apparatus according to claim 1, wherein: the three-meter ruler (1) comprises a first ruler body (10) and a second ruler body (11) which are hinged to each other at the end parts, and the guide rail (2) is divided into two sections and is respectively arranged on the first ruler body (10) and the second ruler body (11).