Pile foundation sampling device for road and bridge construction

Abstract

The invention relates to the technical field of road detection devices, in particular to a pile foundation sampling device for road and bridge construction, which comprises a cylinder frame, a driving disc is arranged in the cylinder frame, at least three milling cutter drill bits are rotatably arranged on the driving disc, and the three milling cutter drill bits revolve along a circular track and rotate at a high speed. The sampling precision is higher, the surface of a sample core is smoother, a cleaning roller is further arranged on the driving disc, a roller brush of the cleaning roller conducts secondary treatment and cleaning on the surface of the sample core, subsequent sample core treatment is facilitated, the detection efficiency is improved, meanwhile, a rotating sleeve, a belt wheel and limiting belts are arranged on the periphery of a drill rod of a milling cutter drill bit, the sample core is limited through the multiple limiting belts, and the detection accuracy is improved. By arranging the film covering assembly, the sample core can be automatically covered with a film after entering the cover cylinder, the sample core is effectively prevented from making contact with air for a long time, the surface of the sample core is prevented from being oxidized, the protection effect is improved, and the detection precision is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of road detection devices, and in particular to a pile foundation sampling device for road and bridge construction. Background Art

[0002] The road pile foundation sampling device is mainly used to extract samples from road pile foundations in order to test and evaluate material properties.

[0003] For example, Chinese patent CN116718419A discloses a drilling sampling device for road and bridge inspection, which includes a support frame, a drill barrel, a knocking assembly, a detection assembly and a drive assembly. Driven by the first drive unit and the second drive unit in the drive assembly, the drill barrel gradually samples on the road or bridge. After the drill barrel sampling is completed, the detection assembly detects whether there is a sample core inside the drill barrel. If the detection assembly detects that there is a sample core inside the drill barrel, the third drive unit starts to drive the knocking block to slide back and forth along the slide rail, and the knocking block knocks the drill barrel to knock out the sample core stuck in the drill barrel.

[0004] However, in the above scheme, the contact area between the drill tube and the sample core is large when sampling, resulting in greater friction. The heat generated by friction will cause the surface properties of the sample core to change, and the sample core needs to be processed again after sampling, which is not conducive to the efficiency of detection. Summary of the invention

[0005] Based on this, it is necessary to provide a pile foundation sampling device for road and bridge construction to address the problem that the current barrel drill has a large contact area with the sample core during sampling.

[0006] The above purpose is achieved through the following technical solutions: A pile foundation sampling device for road and bridge construction, comprising: A cartridge rack, on which a drive disc is coaxially and rotatably arranged, on which at least three milling cutter bits are rotatably arranged, and the three milling cutter bits are evenly distributed along the circumference of the drive disc; A driving assembly, the driving assembly is used to drive the driving disc and the milling cutter drill bit to rotate around their own axes respectively; A cover cylinder, wherein the cover cylinder is located at the bottom of the cylinder frame, and the bottom of the cover cylinder is higher than the tops of the three milling cutter bits; A cleaning roller is rotatably arranged on the driving disk, a roller brush is arranged on the periphery of the cleaning roller, the interior of the cleaning roller is hollow, and negative pressure is formed inside the cleaning roller for absorbing debris.

[0007] Furthermore, the drill rod of the milling cutter drill bit is coaxially and rotatably connected to a rotating sleeve, the rotating sleeve is coaxially and fixedly provided with a pulley on its outer periphery, and limiting belts are wound around the three pulleys, and the inner surface of the limiting belts abuts against the outer surface of the sample core.

[0008] Furthermore, a film coating assembly is provided on the inner surface of the cover cylinder, and the film coating assembly can coat and seal the sample core entering the cover cylinder.

[0009] Furthermore, the coating assembly includes a coating sleeve and a top plate, the coating sleeve is coaxially and rotatably arranged on the inner circumference of the cover sleeve, the side wall of the coating sleeve is filled with a folded film, one end of the film is fixedly connected to the coating sleeve, the top plate is axially slidably arranged on the inner circumference of the coating sleeve, and the bottom of the top plate is fixedly connected to the other end of the film.

[0010] Furthermore, the top plate and the cover tube are provided with guide telescopic rods, and the outer periphery of the guide telescopic rods is provided with elastic parts.

[0011] Furthermore, the drive assembly includes a first drive motor and a second drive motor, the first drive motor is fixedly arranged in the drum frame, the rotating shaft of the first drive motor is coaxial with and fixedly connected to the drive disk, the second drive motor is coaxial and fixedly arranged at the bottom of the drive disk, and the rotating shaft of the second drive motor is driven by the peripheral transmission belts of three milling cutter drill bits.

[0012] Furthermore, a transmission wheel is coaxially and fixedly provided on the outer periphery of the drill rods of the three milling cutter drill bits, and a transmission belt is provided on the outer periphery of the transmission wheel and the outer periphery of the rotating shaft of the second driving motor.

[0013] Furthermore, a transmission gear is fixedly provided on the outer periphery of the connecting shaft of the cleaning roller, a gear ring is provided on the inner side wall of the cartridge frame, the axis of the gear ring coincides with the axis of the cartridge frame, and the transmission gear meshes with the gear ring.

[0014] Furthermore, the upper end of the drum frame has a cavity, the upper end surface of the cavity has an opening, the opening is connected to an air pump, a filter is arranged on the opening, and the connecting shaft of the cleaning roller is hollow and the top end is located in the cavity.

[0015] Furthermore, a gripping handle is fixedly provided on the upper end surface of the cartridge rack.

[0016] The beneficial effects of the present invention are: The present invention adopts a milling cutter-type drill, which reduces the contact area compared to the traditional barrel drill, so that the sampling accuracy is higher and the surface of the sample core is smoother; and the roller brush of the cleaning roller is used to perform secondary treatment and cleaning on the surface of the sample core, which is convenient for subsequent sample core processing and improves detection efficiency.

[0017] The present invention arranges a rotating sleeve, a pulley and a limiting belt on the outer periphery of a milling cutter drill bit drill rod, limits the sample core by a plurality of limiting belts, increases the limiting area, reduces the vibration of the sample core and improves the stability.

[0018] The present invention arranges a film covering component in the cover tube, so that the sample core can be automatically covered with a film after entering the cover tube, effectively blocking the sample core from contacting with the air for a long time, preventing oxidation of the sample core surface, improving the protection effect, and ensuring the detection accuracy.

[0019] The cleaning roller of the present invention realizes rotation while revolving through meshing transmission with the gear ring, and its peripheral roller brush can perform secondary grinding on the surface of the sample core and remove debris; the cleaning roller is hollow inside, and the connecting shaft is also hollow. In conjunction with the vacuum pump and the filter screen, it can effectively absorb drilling debris, reduce dust, absorb part of the heat, and avoid damage to the vacuum pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a pile foundation sampling device for road and bridge construction provided by one embodiment of the present invention; Figure 2 for Figure 1 A front view of a pile foundation sampling device for road and bridge construction provided in an embodiment; Figure 3 for Figure 2 A cross-sectional view along AA of a pile foundation sampling device for road and bridge construction provided in an embodiment; Figure 4 for Figure 3 A partial enlarged view of part X of a pile foundation sampling device for road and bridge construction provided in an embodiment; Figure 5 for Figure 2 A cross-sectional view along BB of a pile foundation sampling device for road and bridge construction provided in an embodiment; Figure 6 for Figure 2 A cross-sectional view of a pile foundation sampling device for road and bridge construction along CC provided in an embodiment; Figure 7 for Figure 1 A top view of a pile foundation sampling device for road and bridge construction provided in one embodiment; Figure 8 for Figure 7 A cross-sectional view along EE of a pile foundation sampling device for road and bridge construction provided in an embodiment; Fig. 9 for Figure 8 A partial enlarged view of part Y of a pile foundation sampling device for road and bridge construction provided in an embodiment; Fig.10 A schematic diagram of the internal structure of a pile foundation sampling device for road and bridge construction in a first state provided by an embodiment of the present invention; Fig.11 for Fig.10 A partial enlarged view of the Z portion of the pile foundation sampling device for road and bridge construction provided in an embodiment of the present invention in the first state; Fig.12 A schematic diagram of the internal structure of a pile foundation sampling device for road and bridge construction in a second state provided by an embodiment of the present invention; Fig.13 for Fig.12 A partial enlarged view of the U portion of the pile foundation sampling device for road and bridge construction in the second state provided by one embodiment.

[0021] in: 100, cartridge holder; 110, gripping handle; 120, cavity; 130, opening; 140, filter screen; 150, drive disk; 160, connecting disk; 170, dust cover; 200, milling cutter drill bit; 210, drill rod; 220, rotating sleeve; 230, pulley; 240, limiting belt; 250, transmission wheel; 260, transmission belt; 270, limiting ring; 300, cleaning roller; 310, connecting shaft; 320, transmission gear; 330, gear ring; 400, cover tube; 410, film sleeve; 420, receiving groove; 430, film; 440, top plate; 450, guide telescopic rod; 460, elastic member; 470, connecting ear; 500, a first driving motor; 510, a second driving motor; 600, sample core. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0024] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0025] Refer to the following Figure 1-Figure 13 To describe a pile foundation sampling device for road and bridge construction provided by the present invention.

[0026] A pile foundation sampling device for road and bridge construction is suitable for sampling road pile foundations, comprising a drum frame 100, a driving disk 150 is rotatably arranged inside the drum frame 100, three milling drill bits 200 are rotatably arranged on the driving disk 150, specifically, drill rods 210 of the three milling drill bits 200 are rotatably connected to the driving disk 150, the three milling drill bits 200 are evenly distributed along the circumference of the driving disk 150, the three milling drill bits 200 are located at the bottom of the drum frame 100, and a driving assembly is arranged on the drum frame 100, the driving assembly can drive the driving disk 150 to rotate around its own axis and can also drive the three milling drill bits 200 to rotate around their own axes, so that the driving disk 150 drives the three milling drill bits 200 rotating around their own axes to revolve, and the orbits of the three milling drill bits 200 revolving around their own axes are circular, so that a cylindrical sample core 600 can be drilled, and the sample core 600 can be drilled in the drum frame. A cover cylinder 400 is provided at the bottom of 100, and the bottom of the cover cylinder 400 is higher than the top of the three milling cutter bits 200, and the three milling cutter bits 200 do not contact the cover cylinder 400. As the cylinder frame 100 is pressed down, the sample core 600 drilled out by the three milling cutter bits 200 moves upward relative to the cover cylinder 400, and the cylindrical sample core 600 gradually enters the cover cylinder 400, and a cleaning roller 300 is also rotatably provided on the driving disk 150, and the connecting shaft 310 of the cleaning roller 300 is rotatably connected to the driving disk 150, and the cleaning roller 300 and the milling cutter bits 200 are in the same plane, and a roller brush (not shown in the figure) is provided on the outer periphery of the cleaning roller 300, and the roller brush contacts the outer periphery of the sample core 600 at the bottom of the cover cylinder 400, and when the cleaning roller 300 rotates around its own axis, the roller brush can rub against the outer periphery of the sample core 600, thereby polishing and cleaning the outer periphery of the sample core 600 for two times.

[0027] At the same time, the cleaning roller 300 in the present invention is hollow inside and has a through hole at the bottom. The bottom of the cleaning roller 300 is slightly higher than the bottom of the milling cutter bit 200, so that the cleaning roller 300 can absorb the debris generated when the milling cutter bit 200 takes samples, thereby reducing dust in the environment, and the suction force of the cleaning roller 300 can absorb part of the heat generated when the milling cutter bit 200 drills the sample core 600.

[0028] It can be understood that the present invention reduces the contact area by adopting a milling cutter-type drill compared to the traditional barrel drill method, thereby achieving higher accuracy and a smoother surface of the sample core 600, and uses the roller brush of the cleaning roller 300 to perform secondary treatment and cleaning on the surface of the sample core 600, which can make subsequent processing of the sample core 600 more convenient and greatly improve the detection efficiency of the sample core 600.

[0029] Specifically, the outer circumference of the lower part of the drill rod 210 of the milling drill bit 200 in this embodiment is coaxially and rotatably connected to the rotating sleeve 220, and two bearings are arranged between the outer circumference of the drill rod 210 of the milling drill bit 200 and the inner circumference of the rotating sleeve 220. Figure 3 and Figure 4 As shown, the two bearings are located at the upper and lower positions respectively. The bearing connection can improve the stability of the two when they rotate relative to each other. The upper position of the outer periphery of the rotating sleeve 220 is coaxial and the fixed sleeve is provided with a pulley 230. The outer periphery of the drill rod 210 of each milling drill bit 200 is the same. A limiting belt 240 is arranged around the outer periphery of the three pulleys 230, and the inner surface of the limiting belt 240 can contact the outer surface of the sample core 600, thereby stabilizing the sample core 600 and reducing the vibration of the sample core 600.

[0030] It should be noted that, in order to further reduce the vibration of the sample core 600, the present invention has three pulleys 230 axially arranged on the outer periphery of the rotating sleeve 220 on the outer periphery of the drill rod 210, and the outer peripheries of the three pulleys 230 are provided with limiting belts 240, totaling three limiting belts 240. The different heights of the three limiting belts 240 make the area of ​​the sample core 600 limited larger, thereby further improving the stability of the sample core 600.

[0031] In a further embodiment, a coating assembly is provided in the cover tube 400 of the present invention, and the coating assembly can cover the sample core 600 entering the cover tube 400 with a film 430 to seal the sample core 600, thereby preventing the surface of the sample core 600 from being in contact with the outside air for a long time to produce an oxidation reaction and affect the detection of the sample core 600.

[0032] Specifically, Fig.10 , Fig.11 , Fig.12 and Fig.13As shown, the coating assembly in this embodiment includes a coating sleeve 410 and a top plate 440. The coating sleeve 410 is coaxially and rotatably arranged on the inner periphery of the cover cylinder 400. An annular groove is provided on the inner periphery of the bottom of the cover cylinder 400, and the coating sleeve 410 is rotatably connected in the annular groove. The outer periphery of the coating sleeve 410 is in sliding contact with the bottom of the annular groove so that the coating sleeve 410 can rotate in the annular groove, but the coating sleeve 410 cannot move axially relative to the annular groove. A receiving groove 420 is provided on the side wall of the coating sleeve 410, and the receiving groove 420 is filled with a folded film 430. One end of the film 430 is fixed in the receiving groove 420, and the other end of the film 430 extends out of the receiving groove 420 and is connected to the top plate 440. The top plate 440 is axially slidably arranged on the inner periphery of the coating sleeve 410, and the top plate 440 can move axially along the coating sleeve 410, and the bottom of the top plate 440 is connected to the film 430.

[0033] When the sample core 600 comes into contact with the top plate 440, due to the interaction between the two, the sample core 600 applies an upward thrust to the top plate 440, causing the top plate 440 to move axially upward inside the cover tube 400. In the process of upward movement, the top plate 440 pulls the film 430 by virtue of the connection with the film 430, so that the film 430 gradually extends out of the receiving groove 420 of the coating sleeve 410. Finally, the film 430 completely covers the surface of the sample core 600, constructing an effective isolation barrier, effectively blocking the long-term contact between the sample core 600 and the air, and significantly improving the protection effect of the sample core 600.

[0034] Specifically, in order to ensure that the top plate 440 can move along the axial direction of the coating sleeve 410, a guide telescopic rod 450 is arranged in the cover tube 400. There is gas inside the guide telescopic rod 450, and the gas can be compressed to have a telescopic function, and is initially in an extended state. One end of the guide telescopic rod 450 is fixed to the top of the cover tube 400, and the other end of the guide telescopic rod 450 is fixed to the upper end of the top plate 440. When the top rod drives the top plate 440 to move upward, the guide telescopic rod 450 will be shortened synchronously to guide the top plate 440 to move along a predetermined axial direction.

[0035] A compression spring is sleeved on the outer periphery of the guide telescopic rod 450 as an elastic member 460. The upper end of the elastic member 460 is fixed to the top end of the cover tube 400, and the lower end is in contact with the top end of the top plate 440. In the initial state, the elastic member 460 maintains its original length. As the top plate 440 moves up and down, the elastic member 460 expands and contracts accordingly, which can not only buffer the impact force of the top plate 440 during the movement, but also help the top plate 440 to reset.

[0036] It should be noted that since the guide telescopic rod 450 arranged inside the cover barrel 400 has a certain length, the maximum distance of the axial upward movement of the top plate 440 in the cover barrel 400 will be affected by the guide telescopic rod 450, so that the sample core 600 cannot be completely covered by the film 430. Therefore, the present invention slides the upper end of the guide telescopic rod 450 at the top of the cover barrel 400, so that one end of the guide telescopic rod 450 can slide out of the cover barrel 400, thereby reducing the influence of the length of the guide telescopic rod 450 on the maximum distance of the upward movement of the top plate 440 in the cover barrel 400. That is to say, when the top plate 440 moves upward in the cover barrel 400, the upper end of the guide telescopic rod 450 can move upward at the top of the cover barrel 400. When the upper end moves to the maximum distance, the guide telescopic rod 450 begins to shorten, so that the top plate 440 can move a greater distance upward in the cover barrel 400.

[0037] Specifically, Fig.10 and Fig.12 As shown, a guide cylinder is provided at the top of the cover cylinder 400, and the bottom of the guide cylinder is connected to the cover cylinder 400. The upper end of the guide telescopic rod 450 can be accommodated inside the guide cylinder. When the guide telescopic rod 450 moves upward, it can enter the guide cylinder through the guidance of the guide cylinder.

[0038] In this embodiment, the cover cylinder 400 is configured to be able to slide along the axial direction of the cartridge frame 100. Three connecting ears 470 are fixedly arranged on the outer periphery of the cover cylinder 400. The three connecting ears 470 are slidably sleeved on the outer periphery of the drill rod 210 of the milling cutter drill bit 200, so that the cover cylinder 400 can move along the axial direction of the cartridge frame 100, and a limit ring 270 is arranged on the outer periphery of the rotating sleeve 220 on the outer periphery of the drill rod 210 of the milling cutter drill bit 200, so as to limit the axial upward movement distance of the cover cylinder 400, as shown in FIG. Figure 3 , Fig.10 and Fig.12 As shown, in the initial state, the lower end of the cover cylinder 400 is closest to the top of the milling cutter bit 200. When the milling cutter bit 200 starts to drill the sample core 600, the top of the sample core 600 will abut the top plate 440 and move upward. Since there is an elastic member 460 between the top plate 440 and the cover cylinder 400, the sample core 600 will first push the cover cylinder 400 to move upward as a whole. When the three connecting ears 470 on the cover cylinder 400 move to contact with the limit ring 270, they stop moving upward. At this time, the top plate 440 begins to compress the elastic member 460, and the top plate 440 begins to move upward relative to the cover cylinder 400, so that the film 430 inside the cover cylinder 400 gradually covers the outer periphery of the sample core 600, thereby preventing the sample core 600 from being in contact with the air for a long time.

[0039] In a further embodiment, the driving assembly in the present invention includes a first driving motor 500 and a second driving motor 510. The first driving motor 500 is firmly anchored to the top of the drum frame 100 with the help of an adaptive mounting base. The output shaft is rigidly fixed coaxially with the center of the driving disk 150 through a high concentricity connection process. When the first driving motor 500 receives a start command, according to the motor operation principle, the output shaft uses the driving disk 150 as a load to drive it to perform a fixed-axis rotation motion around its own axis. Driven by the driving disk 150, the three milling cutter drill bits 200 mechanically connected thereto synchronously carry out a circular orbital motion, and the drilling operation of the target sample core 600 is achieved by means of this motion mode.

[0040] The second drive motor 510 is positioned by a specific tool and accurately installed at the geometric center position of the bottom of the drive disk 150. The outer circumferential surface of the drill rod 210 of each milling drill bit 200 is coaxially assembled with a transmission wheel 250 through a reliable fixing method such as a key connection. According to the principle of mechanical transmission, Figure 5 As shown, a transmission belt 260 sequentially surrounds the inner circumference of the three transmission wheels 250 according to the established winding rules, and forms a reliable friction transmission connection with the outer circumference of the output shaft of the second drive motor 510. When the second drive motor 510 is started, the output shaft drives the transmission belt 260 to make a circular motion by virtue of the friction between the transmission belt 260, and then synchronously transmits the rotational driving torque to the three transmission wheels 250, driving the milling cutter drill bit 200 to synchronously rotate, and providing cutting power for the drilling operation of the sample core 600.

[0041] Specifically, a dust cover 170 is provided on the second drive motor 510 in this embodiment. The dust cover 170 can effectively block external dust, powder and other impurities from entering the second drive motor 510, and prevent dust from accumulating on motor windings, iron cores and other components, thereby reducing problems such as poor heat dissipation and reduced insulation performance caused by dust accumulation, thereby extending the service life of the motor.

[0042] In a further embodiment, in order to give the cleaning roller 300 a rotation function, a transmission gear 320 is coaxially fixedly installed on the outer periphery of the connecting shaft 310 of the cleaning roller 300 by a reliable method such as a key connection or interference fit, and a gear ring 330 is provided on the inner wall of the drum frame 100. The axis of the gear ring 330 coincides with the axis of the drum frame 100, and forms a meshing transmission relationship with the transmission gear 320.

[0043] Since the cleaning roller 300 is rotatably installed on the driving disk 150, when the driving disk 150 is driven by the first driving motor 500 and starts to rotate, the cleaning roller 300 then revolves around the central axis of the drum frame 100. Since the transmission gear 320 is installed on the connecting shaft 310 of the cleaning roller 300, and the ring gear 330 is fixed to the inner wall of the drum frame 100, during the revolution of the cleaning roller 300, the transmission gear 320 and the ring gear 330 are continuously meshed. According to the gear meshing transmission principle, the cleaning roller 300 will rotate around its own axis while revolving. This motion characteristic enables the roller brush on the periphery of the cleaning roller 300 to perform secondary grinding on the surface of the sample core 600, and effectively remove debris and other impurities on the surface of the sample core 600.

[0044] It should be noted that, in order to ensure the smooth rotation of the cleaning roller 300 and the milling cutter drill bit 200, a connecting disk 160 is also rotatably arranged in the drum frame 100. There are three cleaning rollers 300 in this embodiment, so six rotating holes are opened on the connecting disk 160, and the six rotating holes are paired two by two. The drill rods 210 of the three milling cutter drill bits 200 pass through the three rotating holes respectively, and the connecting shafts 310 of the three cleaning rollers 300 pass through the other three rotating holes respectively. When the driving disk 150 rotates, the connecting shafts 310 of the three cleaning rollers 300 and the drill rods 210 of the three milling cutter drill bits 200 can drive the connecting disk 160 to rotate. The connecting disk 160 makes the rotation of the cleaning roller 300 and the milling cutter drill bit 200 more stable.

[0045] In a further embodiment, in order to enable the cleaning roller 300 to absorb impurities, the connecting shaft 310 of the cleaning roller 300 is set to be hollow, and a cavity 120 is set at the upper end of the drum frame 100, and an opening 130 is provided on the top of the cavity 120, and the opening 130 is connected to an air pump (not shown in the figure), and a filter screen 140 is provided on the opening 130. The top of the connecting shaft 310 of the cleaning roller 300 is also located in the cavity 120. When the air pump is started, a negative pressure is formed in the cavity 120, so that a negative pressure is also formed inside the cleaning roller 300, so that the debris generated when the milling cutter drill bit 200 drills the sample core 600 can be absorbed into the cavity 120. The setting of the filter screen 140 can prevent impurities from entering the air pump and damaging the air pump.

[0046] Specifically, Figure 3As shown, the driving disc 150 of the present invention is rotatably sealed and connected in the cartridge frame 100, and a cavity 120 is formed between the driving disc 150 and the top of the cartridge frame 100. The top of the connecting shaft 310 of the cleaning roller 300 passes through the driving disc 150 and is located in the cavity 120. The hollowness of the connecting shaft 310 allows the interior of the cleaning roller 300 to communicate with the cavity 120. Therefore, when negative pressure is formed in the cavity 120, the cleaning roller 300 can absorb debris through the hollow connecting shaft 310 and suck the debris into the cavity 120. In order to facilitate the rotational connection of the connecting shaft 310 of the cleaning roller 300 on the driving disk 150, two bearings are also provided at the connection between the connecting shaft 310 of the cleaning roller 300 and the driving disk 150. The lower end face of one of the two bearings located at the top abuts against the upper end face of the driving disk 150, while the upper end face abuts against the nut above the connecting shaft 310 of the cleaning roller 300; similarly, the upper end face of the bearing located at the bottom abuts against the lower end face of the driving disk 150, while the lower end face abuts against the nut below the connecting shaft 310 of the cleaning roller 300.

[0047] Specifically, a holding handle 110 is fixedly provided on the top of the cartridge rack 100 in the present invention, and there are two holding handles 110. When performing a coring operation, the operator moves the cartridge rack 100 through the two holding handles 110, and applies force to the holding handles 110 so that the cartridge rack 100 has a tendency to move downward, thereby enabling the three milling cutter drill bits 200 to revolve in a circular trajectory and rotate around their own axes so as to move downward to gradually drill the sample core 600.

[0048] The specific working process of a pile foundation sampling device for road and bridge construction provided by the present invention is described in combination with the above embodiments: The pile foundation sampling device for road and bridge construction is placed at the designated position. The operator grasps the handle 110 and presses it downward, and starts the first drive motor 500 and the second drive motor 510. The first drive motor 500 drives the drive disk 150 to rotate around its own axis, and the drive disk 150 drives the three milling drill bits 200 and the three cleaning rollers 300 to revolve around the axis of the drive disk 150. Since the transmission gear 320 on the outer periphery of the connecting shaft 310 of the cleaning roller 300 is engaged with the gear ring 330 in the drum frame 100, the connecting shaft 310 of the cleaning roller 300 drives the cleaning roller 300 to rotate around its own axis, and the second drive motor 510 drives the drill rods 210 of the three milling drill bits 200 to rotate synchronously through the transmission belt 260 and the transmission wheel 250, the three milling drill bits 200 rotate at high speed around their own axes to start drilling the sample core 600.

[0049] During the process of drilling the sample core 600, when the cleaning roller 300 rotates around its own axis, the roller brush on its periphery can grind the periphery of the sample core 600 for a second time, and the vacuum pump (not shown in the figure) is started. When the vacuum pump draws air, negative pressure is formed in the cavity 120. The upper end of the connecting shaft 310 of the cleaning roller 300 is located in the cavity 120, so the bottom of the cleaning roller 300 can absorb air, thereby sucking the debris drilled by the three milling cutter drill bits 200 into the cavity 120. The filter screen 140 at the top of the cavity 120 can prevent the debris from damaging the vacuum pump.

[0050] As the length of the sample core 600 gradually increases, the outer circumference of the sample core 600 will be limited by the three limiting belts 240, so that the sample core 600 can stably enter the cover cylinder 400. After the sample core 600 enters the cover cylinder 400, it contacts the top plate 440. As the sample core 600 moves upward, the sample core 600 can push the cover cylinder 400 to move upward synchronously. When the cover cylinder 400 moves to the point where the three connecting ears 470 contact the limiting ring 270, it stops moving upward, and the top plate 440 begins to compress the elastic member 460. The top plate 440 moves axially upward relative to the coating sleeve 410 in the cover cylinder 400. Since the coating sleeve 410 is rotatably arranged on the inner periphery of the cover cylinder 400, the coating sleeve 410 and the top plate 440 can be stationary in the circumferential direction relative to the sample core 600, while the coating sleeve 410 and the top plate 440 rotate circumferentially relative to the cover cylinder 400, so that the top plate 440 can smoothly pull the film 430 inside the coating sleeve 410 to extend and cover the outer periphery of the sample core 600. After coring is completed, the outer periphery of the sample core 600 is covered with a layer of film 430 to reduce the prolonged contact between the surface of the sample core 600 and the outside air, thereby avoiding affecting the subsequent detection accuracy of the sample core 600.

[0051] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A pile foundation sampling device for road and bridge construction, characterized in that: include: A cartridge rack, on which a drive disc is coaxially and rotatably arranged, on which at least three milling cutter bits are rotatably arranged, and the three milling cutter bits are evenly distributed along the circumference of the drive disc; A driving assembly, the driving assembly is used to drive the driving disc and the milling cutter drill bit to rotate around their own axes respectively; A cover cylinder, wherein the cover cylinder is located at the bottom of the cylinder frame, and the bottom of the cover cylinder is higher than the tops of the three milling cutter bits; A cleaning roller is rotatably arranged on the driving disk, a roller brush is arranged on the periphery of the cleaning roller, the interior of the cleaning roller is hollow, and negative pressure is formed inside the cleaning roller for absorbing debris.

2. The pile foundation sampling device for road and bridge construction according to claim 1, characterized in that: The drill rod of the milling cutter drill bit is coaxially and rotatably connected to a rotating sleeve, the rotating sleeve is coaxially and fixedly provided with a pulley on its outer periphery, and limiting belts are wound around three pulleys, and the inner surface of the limiting belts abuts against the outer surface of the sample core.

3. The pile foundation sampling device for road and bridge construction according to claim 1, characterized in that: The inner surface of the cover cylinder is provided with a film covering component, and the film covering component can cover and seal the sample core entering the cover cylinder.

4. The pile foundation sampling device for road and bridge construction according to claim 3 is characterized in that: The coating assembly includes a coating sleeve and a top plate. The coating sleeve is coaxially and rotatably arranged on the inner periphery of the cover sleeve. The side wall of the coating sleeve is filled with a folded film. One end of the film is fixedly connected to the coating sleeve. The top plate is axially slidably arranged on the inner periphery of the coating sleeve. The bottom of the top plate is fixedly connected to the other end of the film.

5. The pile foundation sampling device for road and bridge construction according to claim 4, characterized in that: A guiding telescopic rod is arranged inside the top plate and the cover tube, and an elastic member is arranged on the outer periphery of the guiding telescopic rod.

6. The pile foundation sampling device for road and bridge construction according to claim 1, characterized in that: The driving assembly includes a first driving motor and a second driving motor. The first driving motor is fixedly arranged in the drum frame. The rotating shaft of the first driving motor is coaxial with and fixedly connected to the driving disk. The second driving motor is coaxially and fixedly arranged at the bottom of the driving disk. The rotating shaft of the second driving motor is driven by the peripheral transmission belts of three milling cutter drill bits.

7. The pile foundation sampling device for road and bridge construction according to claim 6, characterized in that: The outer peripheries of the drill rods of the three milling cutter drill bits are coaxially and fixedly provided with transmission wheels, and the outer peripheries of the transmission wheels and the outer periphery of the rotating shaft of the second driving motor are provided with transmission belts.

8. The pile foundation sampling device for road and bridge construction according to claim 6, characterized in that: A transmission gear is fixedly arranged on the outer periphery of the connecting shaft of the cleaning roller, a gear ring is arranged on the inner side wall of the cartridge frame, the axis of the gear ring coincides with the axis of the cartridge frame, and the transmission gear meshes with the gear ring.

9. The pile foundation sampling device for road and bridge construction according to claim 8, characterized in that: The upper end of the drum frame has a cavity, the upper end surface of the cavity has an opening, the opening is connected to an air pump, a filter is arranged on the opening, the connecting shaft of the cleaning roller is hollow and the top end is located in the cavity.

10. The pile foundation sampling device for road and bridge construction according to claim 1, characterized in that: A holding handle is fixedly arranged on the upper end surface of the cartridge frame.

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