A sampling device for roadbed quality detection in road construction

Abstract

The present invention relates to the technical field of sampling devices, and discloses a sampling device for roadbed quality inspection in road construction, comprising a housing, a circular knife arranged at the bottom of the housing, two bayonet holes symmetrically opened at both sides of the circular knife, a sampling mechanism arranged inside the circular knife, and a lifting mechanism arranged at the top of the housing; the sampling mechanism comprises a telescopic unit arranged at the top of the circular knife, a rotating unit arranged at the middle of the circular knife, and an opening and closing unit arranged at a side of the circular knife away from the telescopic unit; the telescopic unit comprises a variable diameter hole arranged at the top of the circular knife, a connecting rod arranged inside the variable diameter hole, two cutting knives symmetrically arranged at both ends of the connecting rod, and a special-shaped groove opened on the inner wall of the circular knife. By setting the sampling mechanism, the convenience of sampling is improved, the dependence on other tools is reduced, and the traditional method of hitting the circular knife with a hammer is replaced by a rotating handle, which improves the sampling efficiency and reduces the difficulty of operation.

Description

Technical Field

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

[0002] During road construction, roadbed quality inspection is extremely important and directly related to the service life of the road and driving safety. The purpose of the roadbed quality inspection sampling device is that it can accurately and efficiently obtain roadbed material samples and provide reliable data support for subsequent laboratory testing. In the early stage of road construction, by sampling and testing the roadbed materials, it can be evaluated whether the raw materials meet the design requirements and provide a basis for construction. During the construction process, the sampling device can regularly test key indicators such as roadbed compaction and water content to ensure construction quality. During the road acceptance stage, the sampling device can help the inspection unit quickly obtain roadbed samples and provide an important reference for road quality assessment.

[0003] The sampling device of traditional roadbed quality inspection is widely used in road construction, but due to the limitations of its structure and working principle, there are often some problems that cannot be ignored. For example, the sampling device of traditional roadbed quality inspection often needs to be equipped with a variety of tools during operation, which increases the complexity and inconvenience of on-site inspection. Specifically, these devices usually require the use of round knives, sleeves, hammers, shovels and possible safety protection equipment. When sampling, the round knife is knocked with a hammer to make it penetrate the roadbed material to the required depth. In this process, due to the need to knock hard, the operation is laborious, and the operation steps are cumbersome, so the efficiency is low, which easily affects the work efficiency; in traditional roadbed quality inspection, after the round knife cuts into the roadbed, it needs to be dug out of the roadbed with a shovel. After digging out the sample, since the sample may be damaged or irregular in shape during the sampling process, the operator also needs to manually trim the sample to ensure the integrity and regularity of the sample. This step usually requires delicate operation, which is not only very inconvenient to operate, but also easy to cause secondary contamination of the sample, affecting the accuracy of the test results. Summary of the invention

[0004] In view of the problem that the existing technology requires the use of multiple tools for coordination and the need to manually trim samples, which leads to cumbersome operations and thus affects engineering efficiency, a sampling device for roadbed quality detection in road construction is proposed.

[0005] The purpose is to reduce the reliance on other tools during the operation and make the sampling process easier to operate.

[0006] The technical solution of the present invention is a sampling device for roadbed quality detection in road construction, comprising a housing, a circular knife arranged at the bottom of the housing, two bayonet holes symmetrically opened on both sides of the circular knife, a sampling mechanism arranged inside the circular knife, and a lifting mechanism arranged at the top of the housing;

[0007] The sampling mechanism includes a telescopic unit arranged at the top of the circular knife, a rotating unit arranged at the middle of the circular knife, and an opening and closing unit arranged at a side of the circular knife away from the telescopic unit;

[0008] The telescopic unit includes a reducing hole arranged at the top of the circular knife, a connecting rod arranged inside the reducing hole, two cutting knives symmetrically arranged at both ends of the connecting rod, a special-shaped groove arranged on the inner wall of the circular knife, a short shaft arranged at the top of the connecting rod, a round pin arranged at the top of the short shaft, a lifting spring sleeved at the bottom of the short shaft, a shaft sleeve arranged at the top of the lifting spring, a long pin arranged at the side of the shaft sleeve away from the round pin, the top and bottom of the lifting spring respectively abut against the bottom of the shaft sleeve and the top of the connecting rod, a driving hole arranged at the side of the shaft sleeve close to the round pin, the inner wall of the driving hole is slidably connected to the outer wall of the round pin, a driving wheel arranged at the top of the shaft sleeve, a rotating shaft arranged at the top of the driving wheel, a knob arranged at the top of the rotating shaft, and a top hole arranged at the top of the shell close to the rotating shaft, and the inner wall of the top hole is slidably connected to the top of the rotating shaft.

[0009] Furthermore, a circular groove is formed on the top of the circular knife on the side away from the variable diameter hole, an annular groove is formed inside the circular knife surrounding the circular groove and the variable diameter hole, a short groove is formed on the top of the circular groove, and a through hole is formed on the side of the short groove away from the variable diameter hole.

[0010] Furthermore, the rotating unit includes a gear ring arranged inside the annular groove, a positioning shaft arranged at the top of the circular groove, a transmission gear arranged outside the positioning shaft, a collecting cylinder arranged on the inner wall of the circular knife, and a driven wheel arranged on the top of the collecting cylinder, and the side of the driven wheel away from the cutter is meshed and connected with the bottom of the transmission gear.

[0011] Furthermore, the opening and closing unit includes a disc arranged on the top of the positioning shaft, a downward pressure spring arranged on the top of the disc, the top and bottom of the downward pressure spring are respectively fixedly connected to the top of the short groove and the top of the disc, a square hole is opened on the outer wall of the circular knife away from the cutting knife side, an inclined block is arranged inside the through hole, and a cover plate is arranged on the inner side of the square hole.

[0012] Furthermore, the outer side of the cover plate is provided with an arc-shaped groove, a latch arranged inside the arc-shaped groove, a locking spring arranged on a side of the arc-shaped groove away from the latch, and a slot arranged on a side of the square hole close to the latch.

[0013] Further, the lifting mechanism includes a winding unit arranged on the top of the housing, and a releasing unit arranged inside the winding unit;

[0014] The winding unit includes a stepped hole opened on the top side of the shell away from the top hole, a handle arranged inside the stepped hole, a reel arranged at the bottom of the handle, a cable arranged in the middle of the reel, a roller arranged at the top of the cable, two support plates symmetrically arranged on both sides of the roller, the tops of the two support plates are fixedly connected to the top of the inner wall of the shell, and an impact plate is arranged at the bottom of the cable.

[0015] Furthermore, two bayonet holes are symmetrically opened on both sides of the impact plate, two guide bars are symmetrically arranged on both sides of the inner wall of the shell, a partition is arranged on the top of the guide bar, and a force storage spring is arranged at the bottom of the partition.

[0016] Furthermore, the release unit includes a pressure rod arranged at the top of the handle, two limiting holes symmetrically opened on the side of the handle away from the pressure rod, a lever arranged at the bottom of the pressure rod, both sides of the lever are rotatably connected to the limiting holes, a return spring arranged at the bottom of the lever, a lifting rod arranged on the side of the lever away from the pressure rod, two clamping blocks symmetrically arranged at the bottom of the lifting rod, two inclined holes symmetrically opened at the bottom of the handle, and two clamping grooves symmetrically opened inside the wire wheel, and the bottom of the clamping block passes through the inclined hole and is clamped with the clamping groove.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The sampling mechanism is set up to improve the convenience of sampling and reduce the dependence on other tools. The sampling mechanism integrates a circular knife, a collecting tube and a driving assembly, making the sampling process simpler, which not only reduces the labor intensity of the operator, but also reduces the complexity of operation caused by a variety of tools. In addition, it can ensure the standardization of samples, reduce the impact of human factors on sample integrity, and improve the accuracy of test data.

[0019] 2. Through the setting of the lifting mechanism, the traditional method of using a hammer to hit the circular knife is replaced by a rotating handle. This improvement reduces labor intensity, improves work efficiency, and makes the sampling process smooth and controllable. Compared with using a hammer to hit, the method of rotating the handle is not only more labor-saving, but also improves the safety of the working environment. By rotating the handle instead of hammering, the sampling process is made lighter, more efficient and safer.

[0020] 3. The setting of the rotating unit improves the sampling efficiency and reduces the difficulty of operation. The design of the rotating unit allows the circular knife to accurately rotate and trim the sample after sampling to ensure that the sample surface is flat and meets the requirements of laboratory analysis. It avoids the tedious steps of traditional manual trimming and reduces the workload of operators. At the same time, it also reduces the risk of sample damage caused by uneven manual trimming, improves the overall work efficiency, maintains the original structure of the sample, reduces human errors, and improves the accuracy of experimental data. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0023] Figure 3 An exploded view of the present invention;

[0024] Figure 4 It is a cross-sectional view of a circular knife of the present invention;

[0025] Figure 5 It is a schematic diagram of the connection between the gear ring and the transmission gear of the present invention;

[0026] Figure 6 It is a schematic diagram of the connection between the circular knife and the collecting cylinder of the present invention;

[0027] Figure 7 It is a schematic diagram of the cutter and sleeve structure of the present invention;

[0028] Figure 8 It is a schematic diagram of the connection between the transmission gear and the positioning shaft of the present invention;

[0029] Fig. 9 It is a schematic diagram of the arc groove and slot structure of the present invention;

[0030] Fig.10 It is a schematic diagram of the connection between the impact plate and the housing of the present invention;

[0031] Fig.11 For the present invention Fig. 9 A magnified image of area A;

[0032] Fig.12 It is a schematic diagram of the internal structure of the handle of the present invention;

[0033] Fig.13 A cross-sectional view of the wire wheel and the handle of the present invention;

[0034] Fig.14 It is a schematic diagram of the connection between the lever and the lifting rod of the present invention.

[0035] In the figure:

[0036] 1. Shell; 2. Circular knife; 3. Bayonet 1; 4. Sampling mechanism; 5. Lifting mechanism; 41. Variable diameter hole; 42. Connecting rod; 43. Cutter; 44. Special-shaped groove; 45. Short shaft; 46. Round pin; 47. Lifting spring; 48. Bushing; 49. Long pin; 410. Driving hole; 411. Driving wheel; 412. Knob; 413. Top hole; 414. Circular groove; 415. Ring groove; 416. Short groove; 417. Through hole; 418. Gear ring; 419. Positioning shaft; 420. Transmission gear; 421. Collecting cylinder; 422. Driven wheel; 423. Disc; 424. Press down spring; 425, square hole; 426, cover plate; 427, arc groove; 428, latch; 429, locking spring; 430, slot; 431, rotating shaft; 432, inclined block; 51, stepped hole; 52, handle; 53, reel; 54, cable; 55, roller; 56, support plate; 57, impact plate; 58, bayonet 2; 59, guide strip; 510, partition; 511, force storage spring; 512, pressure rod; 513, limiting hole; 514, lever; 515, reset spring; 516, lifting rod; 517, block; 518, inclined hole; 519, slot. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0038] Example 1, reference Figure 1-Figure 14, which is the first embodiment of the present invention, provides a sampling device for roadbed quality detection in road construction, including a shell 1, a circular knife 2 slidably connected to the bottom of the shell 1, two bayonet holes 3 symmetrically opened on both sides of the circular knife 2, and also including a sampling mechanism 4 rotatably connected to the inside of the circular knife 2, and a lifting mechanism 5 fixedly connected to the top of the shell 1; the sampling mechanism 4 includes a telescopic unit rotatably connected to the top of the circular knife 2, a rotating unit rotatably connected to the middle of the circular knife 2, and an opening and closing unit slidably connected to the side of the circular knife 2 away from the telescopic unit; the telescopic unit includes a reducing hole 41 set at the top of the circular knife 2, a connecting rod 42 rotatably connected to the inside of the reducing hole 41, two cutting knives 43 symmetrically fixedly connected to the two ends of the connecting rod 42, a special-shaped groove 44 opened on the inner wall of the circular knife 2, and a lifting mechanism 5 fixedly connected to the top of the shell 1; 2, a short shaft 45 at the top, a round pin 46 fixedly connected to the top of the short shaft 45, a lifting spring 47 sleeved on the bottom of the short shaft 45, a sleeve 48 abutting against the top of the lifting spring 47, a long pin 49 fixedly connected to the side of the sleeve 48 away from the round pin 46, the top and bottom of the lifting spring 47 abutting against the bottom of the sleeve 48 and the top of the connecting rod 42 respectively, a driving hole 410 opened on the side of the sleeve 48 close to the round pin 46, the inner wall of the driving hole 410 is slidably connected to the outer wall of the round pin 46, a driving wheel 411 abutting against the top of the sleeve 48, a rotating shaft 431 fixedly connected to the top of the rotating shaft 431, a knob 412 fixedly connected to the top of the rotating shaft 431, and a top hole 413 opened on the top of the housing 1 close to the rotating shaft 431, the inner wall of the top hole 413 is slidably connected to the top of the rotating shaft 431.

[0039] Specifically, by moving the shaft sleeve 48 downward, the round pin 46 and the short shaft 45 can be driven to rotate, and the short shaft 45 drives the connecting rod 42 and the cutter 43 to rotate, so that the cutter 43 extends from the special-shaped groove 44, and the sample machine is trimmed. Through the sampling mechanism 4, the convenience of sampling is improved and the dependence on other tools is reduced. The sampling mechanism 4 integrates the round knife 2, the collecting cylinder 421 and the driving assembly, making the sampling process simpler, which not only reduces the labor intensity of the operator, but also reduces the complexity of operation caused by the large number of tools. In addition, it can ensure the standardization of samples, reduce the impact of human factors on sample integrity, and improve the accuracy of test data.

[0040] Reference Figure 4 A circular groove 414 is formed on the top of the circular knife 2 on the side away from the reducing hole 41, an annular groove 415 is formed inside the circular knife 2 surrounding the circular groove 414 and the reducing hole 41, a short groove 416 is formed on the top of the circular groove 414, and a through hole 417 is formed on the side of the short groove 416 away from the reducing hole 41.

[0041] Specifically, the annular groove 415 can accommodate the gear ring 418, and the circular groove 414 can accommodate the transmission gear 420 to move up and down.

[0042] Reference Figure 6 and Figure 7 The rotating unit includes a gear ring 418 rotatably connected to the inside of the annular groove 415, a positioning shaft 419 slidably connected to the top of the circular groove 414, a transmission gear 420 rotatably connected to the outside of the positioning shaft 419, a collecting cylinder 421 rotatably connected to the inner wall of the circular knife 2, and a driven wheel 422 fixedly connected to the top of the collecting cylinder 421, and the driven wheel 422 is meshedly connected to the bottom of the transmission gear 420 on the side away from the cutter 43.

[0043] Specifically, the gear ring 418 is driven to rotate by the driving wheel 411, and the gear ring 418 can drive the driven wheel 422 and the collecting tube 421 to rotate through the transmission gear 420. The collecting tube 421 rotates and drives the sample to rotate at the same time, and drives the sample and the cutter 43 to rotate relative to each other, thereby cutting the sample.

[0044] Example 2, reference Figure 8 and Fig. 9 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the opening and closing unit includes a disc 423 fixedly connected to the top of the positioning shaft 419, a downward pressure spring 424 fixedly connected to the top of the disc 423, the top and bottom of the downward pressure spring 424 are respectively fixedly connected to the top of the short groove 416 and the top of the disc 423, a square hole 425 is opened on the outer wall of the circular knife 2 away from the cutting knife 43, an inclined block 432 slidably connected to the inside of the through hole 417, and a cover plate 426 rotatably connected to the inner side of the square hole 425.

[0045] Specifically, by pressing the inclined block 432, the disc 423, the positioning shaft 419 and the driven gear can be pushed upward. After the driven gear moves upward, it is disengaged from the driven wheel 422. The downward pressing spring 424 can reset the inclined block 432 and the disc 423 after the pressing is released.

[0046] Reference Fig. 9 An arc-shaped groove 427 is formed on the outer side of the cover plate 426, a latch 428 is slidably connected to the inside of the arc-shaped groove 427, a locking spring 429 is fixedly connected to the side of the arc-shaped groove 427 away from the latch 428, and a slot 430 is formed on the side of the square hole 425 close to the latch 428.

[0047] Specifically, the arc-shaped groove 427 can accommodate the latch pin 428 and the locking spring 429 , and can constrain the movement trajectory of the latch pin 428 .

[0048] Reference Fig.10 and Fig.11The lifting mechanism 5 includes a winding unit arranged on the top of the shell 1, and a releasing unit fixedly connected to the inside of the winding unit; the winding unit includes a stepped hole 51 opened on the top of the shell 1 away from the top hole 413, a handle 52 slidably connected to the inside of the stepped hole 51, a reel 53 rotatably connected to the bottom of the handle 52, a cable 54 fixedly connected to the middle of the reel 53, a roller 55 abutting against the top of the cable 54, two support plates 56 symmetrically rotatably connected to both sides of the roller 55, the tops of the two support plates 56 are fixedly connected to the top of the inner wall of the shell 1, and an impact plate 57 fixedly connected to the bottom of the cable 54.

[0049] Specifically, the handle 52 can drive the reel 53 to reel in the cable 54 . After the cable 54 is reeled in, it drives the impact plate 57 to move upward, and the force storage spring 511 is compressed by the impact plate 57 .

[0050] Reference Fig.10 , two sides of the impact plate 57 are symmetrically provided with bayonet 2 58 , two guide bars 59 symmetrically fixedly connected to the two sides of the inner wall of the shell 1 , and a partition 510 fixedly connected to the top of the guide bar 59 , and a force storage spring 511 arranged at the bottom of the partition 510 .

[0051] Specifically, the second bayonet 58 can prevent the impact plate 57 from rotating by cooperating with the guide bar 59 , and can constrain the movement trajectory of the impact plate 57 .

[0052] Reference Figure 10-13 The release unit includes a pressure rod 512 slidably connected to the top of the handle 52, two limiting holes 513 symmetrically opened on the side of the handle 52 away from the pressure rod 512, a lever 514 abutting against the bottom of the pressure rod 512, both sides of the lever 514 are rotatably connected to the limiting holes 513, a return spring 515 fixedly connected to the bottom of the lever 514, a lifting rod 516 abutting against the side of the lever 514 away from the pressure rod 512, two clamping blocks 517 symmetrically fixedly connected to the bottom of the lifting rod 516, two inclined holes 518 symmetrically opened at the bottom of the handle 52, and two clamping grooves 519 symmetrically opened inside the wire wheel 53, and the bottom of the clamping block 517 passes through the inclined hole 518 and is clamped with the clamping groove 519.

[0053] Specifically, the pressure rod 512 can drive the lever 514 to rotate, the lever 514 drives the lifting rod 516 to move upward, and the lifting rod 516 drives the block 517 to move at the same time, releasing the cooperation between the block 517 and the slot 519, so that the wire wheel 53 can rotate, and the rest of the structure is the same as that of Example 1.

[0054] Based on Examples 1-2, the working principle of the present invention is as follows: the bottom of the sampling device is vertically aligned with the roadbed and the shell 1 is pressed, at which point the bottom of the circular knife 2 contacts the roadbed, and then the handle 52 is rotated, and the handle 52 rotates while driving the wire wheel 53 to rotate, and the wire wheel 53 rotates while winding up the cable 54. During the winding process of the cable 54, the impact plate 57 is driven to rise, and the impact plate 57 rises along a straight line under the action of the second bayonet 58 and the guide strip 59, and squeezes the force storage spring 511 while rising. When the impact plate 57 moves up to the maximum stroke, the circular knife 2 will retract into the interior of the shell 1. At this time, pressing the pressure rod 512 downward will cause one end of the long arm of the lever 514 to move downward, squeezing the reset spring 515 while moving downward. When the long arm of the lever 514 moves downward The short arm rises and drives the lifting rod 516 to rise at the same time. The lifting rod 516 drives the block 517 to move upward together. The block 517 is squeezed by the inclined hole 518 while moving upward. Therefore, the two blocks 517 will approach each other until they are retracted into the interior of the handle 52, thereby releasing the connection with the slot 519 and releasing the constraint on the wire wheel 53, so that the wire wheel 53 can rotate. At this time, the force storage spring 511 will push the impact plate 57 to move downward. The impact plate 57 moves downward and drives the bottom end of the cable 54 to move together. The cable 54 drives the wire wheel 53 to rotate for unwinding. After the impact plate 57 moves downward, it hits the top of the circular knife 2, and then the pressure rod 512 is released. The reset spring 515 drives the lever 514 and the pressure rod 512 to reset. The lever 514 resets At the same time, the lifting rod 516 and the block 517 are reset. By turning the handle 52, the inclined hole 518 and the slot 519 are aligned, and the block 517 will be reconnected with the slot 519, so as to limit the line wheel 53. At this time, turning the handle 52 can drive the line wheel 53 to reel in the cable 54 again, and the impact plate 57 will hit the circular knife 2, so that it will completely cut into the roadbed. The inside of the circular knife 2 is filled with the sample, and then the circular knife 2 is pulled out, and the knob 412 is pressed and rotated while being pressed. The knob 412 moves downward and drives the rotating shaft 431 to move downward. The rotating shaft 431 squeezes the shaft sleeve 48 through the driving wheel 411. After the driving wheel 411 moves downward, it meshes with the gear ring 418. The shaft sleeve 48 moves downward and passes through the driving hole 41 0 The round pin 46 is squeezed and the lifting spring 47 is charged, and the short shaft 45 and the connecting rod 42 are rotated at the same time. The connecting rod 42 rotates and drives the cutter 43 to rotate, so that the cutter 43 extends from the inside of the special-shaped groove 44 to cut the roadbed sample inside the round knife 2. The knob 412 drives the driving wheel 411 to rotate through the rotating shaft 431. The driving wheel 411 drives the transmission gear 420 to rotate through the gear ring 418. The transmission gear 420 drives the collecting tube 421 and the sample inside it to rotate through the driven wheel 422. When the collecting tube 421 rotates, the blade will exceed the sample at the top and bottom of the collecting tube 421 for trimming. After rotating a few circles and completing the trimming, release the knob 412, and the lifting spring 47 will reset the sleeve 48 and the cutter 43.The shaft sleeve 48 pushes the driving wheel 411 upward to release the meshing with the gear ring 418, and resets the rotating shaft 431 through the driving wheel 411, and then pushes the latch 428 to squeeze the locking spring 429 and release the cooperation with the latch 428, releasing the constraint on the cover plate 426. After opening the cover plate 426, the inclined block 432 is pressed, and the inclined block 432 squeezes the disc 423 to make it rise. While the disc 423 rises, the downward pressure spring 424 accumulates force, and the disc 423 drives the positioning shaft 419 and the transmission gear 420 to move upward. After the transmission gear 420 moves upward, it releases the meshing with the driven wheel 422. At this time, the collection tube 421 can be poured out through the square hole 425 to complete the sampling.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A sampling device for roadbed quality detection in road construction, comprising a housing (1), a circular knife (2) arranged at the bottom of the housing (1), and two bayonet holes (3) symmetrically arranged on both sides of the circular knife (2), characterized in that: It also includes a sampling mechanism (4) arranged inside the circular knife (2), and a lifting mechanism (5) arranged on the top of the housing (1); The sampling mechanism (4) comprises a telescopic unit arranged at the top of the circular knife (2), a rotating unit arranged at the middle of the circular knife (2), and an opening and closing unit arranged at a side of the circular knife (2) away from the telescopic unit; The telescopic unit comprises a reducing hole (41) provided at the top of the circular knife (2), a connecting rod (42) provided inside the reducing hole (41), two cutting knives (43) symmetrically provided at both ends of the connecting rod (42), a special-shaped groove (44) provided on the inner wall of the circular knife (2), a short shaft (45) provided at the top of the connecting rod (42), a round pin (46) provided at the top of the short shaft (45), a lifting spring (47) sleeved on the bottom of the short shaft (45), a shaft sleeve (48) provided at the top of the lifting spring (47), a long pin (49) provided on the side of the shaft sleeve (48) away from the round pin (46), and a lifting spring (47). The top and bottom of the housing (1) are respectively in contact with the bottom of the shaft sleeve (48) and the top of the connecting rod (42); a driving hole (410) is provided on the side of the shaft sleeve (48) close to the round pin (46); the inner wall of the driving hole (410) is slidably connected to the outer wall of the round pin (46); a driving wheel (411) is provided on the top of the shaft sleeve (48); a rotating shaft (431) is provided on the top of the driving wheel (411); a knob (412) is provided on the top of the rotating shaft (431); and a top hole (413) is provided on the top of the housing (1) close to the rotating shaft (431); the inner wall of the top hole (413) is slidably connected to the top of the rotating shaft (431).

2. The sampling device for roadbed quality detection in road construction according to claim 1 is characterized in that: A circular groove (414) is formed on the top of the circular knife (2) on a side away from the diameter-changing hole (41), an annular groove (415) is formed inside the circular knife (2) and surrounds the circular groove (414) and the diameter-changing hole (41), a short groove (416) is formed on the top of the circular groove (414), and a through hole (417) is formed on the side of the short groove (416) away from the diameter-changing hole (41).

3. The sampling device for roadbed quality detection in road construction according to claim 1 is characterized in that: The rotating unit comprises a gear ring (418) arranged inside the annular groove (415), a positioning shaft (419) arranged at the top of the circular groove (414), a transmission gear (420) arranged outside the positioning shaft (419), a collecting cylinder (421) arranged on the inner wall of the circular knife (2), and a driven wheel (422) arranged at the top of the collecting cylinder (421), wherein the side of the driven wheel (422) away from the cutting knife (43) is meshedly connected with the bottom of the transmission gear (420).

4. The sampling device for roadbed quality detection in road construction according to claim 1, characterized in that: The opening and closing unit comprises a disc (423) arranged at the top of the positioning shaft (419), a downward pressure spring (424) arranged at the top of the disc (423), the top and bottom of the downward pressure spring (424) being fixedly connected to the top of the short groove (416) and the top of the disc (423) respectively, a square hole (425) opened on the outer wall of the circular knife (2) away from the cutting knife (43), an inclined block (432) arranged inside the through hole (417), and a cover plate (426) arranged on the inner side of the square hole (425).

5. The sampling device for roadbed quality detection in road construction according to claim 4 is characterized in that: The outer side of the cover plate (426) is provided with an arc-shaped groove (427), a latch (428) arranged inside the arc-shaped groove (427), a locking spring (429) arranged on a side of the arc-shaped groove (427) away from the latch (428), and a slot (430) provided on a side of the square hole (425) close to the latch (428).

6. The sampling device for roadbed quality detection in road construction according to claim 1, characterized in that: The lifting mechanism (5) comprises a winding unit arranged on the top of the housing (1), and a releasing unit arranged inside the winding unit; The winding unit comprises a stepped hole (51) opened on the top side of the housing (1) away from the top hole (413), a handle (52) arranged inside the stepped hole (51), a wire wheel (53) arranged at the bottom of the handle (52), a cable (54) arranged in the middle of the wire wheel (53), a roller (55) arranged at the top of the cable (54), two support plates (56) symmetrically arranged on both sides of the roller (55), the tops of the two support plates (56) are fixedly connected to the top of the inner wall of the housing (1), and an impact plate (57) arranged at the bottom of the cable (54).

7. The sampling device for roadbed quality detection in road construction according to claim 6 is characterized in that: The impact plate (57) is symmetrically provided with two bayonet holes (58) on both sides, two guide bars (59) are symmetrically arranged on both sides of the inner wall of the shell (1), a partition plate (510) is arranged on the top of the guide bar (59), and a force storage spring (511) is arranged at the bottom of the partition plate (510).

8. The sampling device for roadbed quality detection in road construction according to claim 6, characterized in that: The release unit comprises a pressure rod (512) arranged at the top of the handle (52), two limiting holes (513) symmetrically opened on the side of the handle (52) away from the pressure rod (512), a lever (514) arranged at the bottom of the pressure rod (512), both sides of the lever (514) are rotatably connected to the limiting holes (513), a return spring (515) arranged at the bottom of the lever (514), a lifting rod (516) arranged on the side of the lever (514) away from the pressure rod (512), two clamping blocks (517) symmetrically arranged at the bottom of the lifting rod (516), two inclined holes (518) symmetrically opened at the bottom of the handle (52), and two clamping grooves (519) symmetrically opened inside the wire wheel (53), and the bottom of the clamping block (517) passes through the inclined hole (518) and is clamped with the clamping groove (519).

Images