Pavement thickness detection sampling device

Abstract

The utility model discloses a pavement thickness detection sampling device, which relates to the technical field of pavement detection and comprises a sampling barrel, a motor for driving the sampling barrel to rotate and a connecting support connected between an output shaft of the motor and the top of the sampling barrel, and a piston plate vertically sliding along the axis of the sampling barrel is mounted in the sampling barrel; a gas storage cavity is formed in the top of the sampling barrel, a through hole and a flow dividing channel are formed in the bottom of the gas storage cavity, and the through hole is communicated with an inner cavity of a barrel body of the sampling barrel. Therefore, manual operation is not needed to retain the sample core, various defects that the sample core is difficult to enter in a sampling stage, soil below the sample core is squeezed to be hard and hard and is difficult to insert into a limiting structure, pressure needing to be applied during sampling and the like due to the fact that large air pressure exists at the inner top of the sampling barrel for storing the sample core are overcome, and use is more convenient and faster.

Description

Technical Field

[0001] The utility model relates to the technical field of road surface detection, in particular to a road surface thickness detection sampling device. Background Art

[0002] Road construction is the most important part of transportation. Since roads need to be worked for a long time, the quality requirements for roads are relatively high. Usually, after the road construction is completed, its thickness will be tested by equipment to see if it meets the usage standards. Most of the existing tests are based on core drilling tests, and the measurement after core sampling is more obvious and direct.

[0003] After searching, the patent document with the announcement number "CN222689067U" discloses a road thickness detection device, which includes a base, with a threaded rod and a sliding rod installed on both sides of the top of the base, a slide plate slidingly provided between the threaded rod and the slide plate, a motor provided on the top of the slide plate, the output shaft of the motor passing through the top of the slide plate and fixedly connected to a concave plate, the bottom of the concave plate being fixedly connected to a sampling barrel, a limiting structure provided on the inside of the sampling barrel, the limiting structure including a screw rod, the ends of which are respectively connected to the inner bottom of the concave plate and the top of the sampling barrel. This road thickness detection device, by providing a limiting structure of the detection device, can ensure that the sample is always located inside the sampling barrel when it is taken out from the initial position of the road, preventing it from falling and affecting the detection, and has excellent practicality.

[0004] Based on the above search and combined with the existing technology, it is found that the existing road thickness detection sampling device requires manual rotation of the limiting structure when in use in order to limit the sample core in the sampling tube, and the sample core is connected to the soil layer below. Driving the limiting structure needs to overcome the resistance of the compressed soil layer at the bottom, which is difficult to rotate manually. At the same time, the spring set in the sampling tube and the gas originally existing in the sampling tube will hinder the entry of the sample core (as the sample core enters, the air pressure in the upper part of the sampling tube gradually increases, and the reaction force applied by the spring also increases), which is not conducive to the smooth entry of the sample core into the sampling tube, nor is it conducive to the stable retention of the sample core in the sampling tube. Therefore, a road thickness detection sampling device is needed. Utility Model Content

[0005] The purpose of this application is to provide a road thickness detection sampling device to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present application provides the following technical solutions: a road thickness detection sampling device, comprising a sampling cylinder, a motor for driving the sampling cylinder to rotate, and a connecting bracket connected between the motor output shaft and the top of the sampling cylinder, wherein a piston plate is installed in the sampling cylinder and slides vertically along the axis of the sampling cylinder;

[0007] An air storage cavity is formed at the top of the sampling tube, and a through hole and a diversion channel are opened at the bottom of the air storage cavity. The through hole is connected to the inner cavity of the sampling tube. The diversion channel is opened on the tube wall of the sampling tube and the lower end extends to the lower part of the sampling tube. A sliding hole connected to the lower end of the diversion channel is also opened on the inner side of the sampling tube.

[0008] A limiting structure is slidably installed in the sliding hole, and the limiting structure includes a limiting plate and a third spring. The limiting plate is slidably embedded in the sliding hole, and the limiting plate is elastically installed in the sliding hole by the third spring. The third spring applies a force to the limiting plate to move away from the axis of the sampling tube;

[0009] A one-way blocking structure and a blocking mechanism are installed in the air storage chamber. The one-way blocking structure is used to block the through hole, so that the air in the sampling cylinder body is squeezed by the piston plate and enters the air storage chamber in one direction. The one-way blocking structure can be opened by operating the top outside the sampling cylinder;

[0010] The blocking mechanism is used to block the connection between the shunt channel and the air storage chamber. When the sampling tube rotates, the blocking mechanism is affected by the centrifugal force to block the upper end of the shunt channel. The blocking mechanism automatically opens when the sampling tube stops rotating.

[0011] Preferably, the blocking mechanism includes a fixed plate, a blocking block and a second spring. The fixed plate is fixed to the bottom wall of the air storage chamber, the blocking block is slidably connected to the bottom wall of the air storage chamber, and both ends of the second spring are respectively fixed to the side walls on which the fixed plate and the blocking block are close to each other. The second spring applies a force to the blocking block to slide toward the side of the fixed plate.

[0012] Preferably, the one-way blocking structure includes a blocking plate and a first spring. The lower end of the blocking plate is plugged into the through hole. The upper end of the blocking plate is elastically connected to the top of the air storage chamber through the first spring. The first spring applies a downward force to the blocking plate.

[0013] Preferably, a sliding sleeve is fixed to the top of the sampling tube, and the lower end of the sliding sleeve extends into the air storage cavity;

[0014] The one-way blocking structure also includes a pull bolt, the lower end of which is fixed to the upper end of the blocking plate, and the upper end of which slides through the sliding sleeve and extends to the top of the sampling tube.

[0015] Preferably, the lower end of the diversion channel connected to the sliding hole is formed with an active cavity for accommodating the limit plate and the third spring. The cross-sectional area of the active cavity is larger than the cross-sectional area of the limit plate, and the end of the third spring away from the limit plate is fixed to the side wall of the active cavity.

[0016] Preferably, multiple groups of diversion channels, sliding holes, blocking mechanisms and limiting structures are provided, and the multiple groups of diversion channels, sliding holes, blocking mechanisms and limiting structures are distributed in a circular array along the axis of the sampling cylinder.

[0017] In summary, the technical effects and advantages of the utility model are:

[0018] 1. In the utility model, the purpose of automatically limiting the sample core is achieved through the arrangement of the blocking mechanism, the limiting structure, the air storage chamber, the diversion channel and the one-way blocking structure, so that the sample core does not need to be retained by manual operation, and it can avoid the presence of a large air pressure at the inner top of the sampling tube for storing the sample core, which leads to difficulties in entering the sample core during the sampling stage, the soil under the sample core is squeezed hard and difficult to insert into the limiting structure, and the pressure required to be applied during sampling is large. The utility model is more convenient and quick to use.

[0019] 2. In the present invention, through the arrangement of the sealing plate, the pull bolt and the first spring, when sampling is completed and the sample core in the sampling tube needs to be taken out, the staff only needs to pull the pull bolt so that the pull bolt drives the sealing plate to move upward, so that the air storage chamber is connected with the through hole again, and the pressurized gas in the air storage chamber enters the sampling tube again. At this time, the air pressure in the sliding hole is reduced, and the pressure is not enough to overcome the elastic force of the third spring to press the limit plate out, so that the limit plate is reset and contracted in the sliding hole under the elastic force of the third spring, and the sample core moves to the bottom of the sampling tube under the push of the upper air pressure. After the lower end of the sample core extends out of the sampling tube, the user can quickly take out the sample core, and the operation is also convenient and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 Schematic diagram of the three-dimensional structure in this embodiment;

[0022] Figure 2 This is a schematic diagram of the upper and lower ends of the sampling tube in this embodiment when viewed in section;

[0023] Figure 3 for Figure 2 A magnified view of the structure at center A;

[0024] Figure 4 This is a top sectional view of the sampling tube in this embodiment.

[0025] In the figure: 1. Sampling tube; 11. Air storage chamber; 12. Through hole; 13. Diverter channel; 131. Active chamber; 14. Sliding hole; 15. Sliding sleeve; 2. Motor; 3. Connecting bracket; 4. Sealing plate; 5. Pull bolt; 6. First spring; 7. Sealing mechanism; 71. Fixed plate; 72. Sealing block; 73. Second spring; 8. Limiting structure; 81. Limiting plate; 82. Third spring; 9. Piston plate. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Example: Reference Figures 1-4 The road thickness detection sampling device shown in the figure includes a sampling tube 1, a motor 2 for driving the sampling tube 1 to rotate, a connecting bracket 3 connected between the output shaft of the motor 2 and the top of the sampling tube 1, and a piston plate 9 is installed in the sampling tube 1 and slides vertically along the axis of the sampling tube 1; it also includes a mounting plate mounted on the connecting bracket 3 and the motor 2, a guide rod and a screw for supporting and driving the mounting plate to slide vertically, and a movable carriage for mounting the guide rod and the screw. The aforementioned mounting plate, guide rod, screw and movable carriage (not shown in the figure) are all disclosed in the prior art, and the connection method and layout between the components are all in the prior art. For example, the motor 2 is fixed to the top of the mounting plate and the output shaft moves downward and penetrates the mounting plate. The connecting bracket 3 is rotatably connected to the bottom of the mounting plate, and no further description is given here.

[0028] An air storage chamber 11 is formed at the top of the sampling barrel 1. A through hole 12 and a diverter channel 13 are formed at the bottom of the air storage chamber 11. The through hole 12 is connected to the inner cavity of the barrel of the sampling barrel 1. The diverter channel 13 is formed on the barrel wall of the sampling barrel 1 and its lower end extends to the lower part of the sampling barrel 1. A sliding hole 14 is also formed on the inner side of the sampling barrel 1 and is connected to the lower end of the diverter channel 13.

[0029] A limiting structure 8 is slidably installed in the sliding hole 14. The limiting structure 8 includes a limiting plate 81 and a third spring 82. The limiting plate 81 is slidably embedded in the sliding hole 14. The limiting plate 81 is elastically installed in the sliding hole 14 by the third spring 82. The third spring 82 applies a force to the limiting plate 81 to move away from the axis of the sampling tube 1;

[0030] A one-way blocking structure and a blocking mechanism 7 are installed in the air storage chamber 11. The one-way blocking structure is used to block the through hole 12, so that the air in the cylinder of the sampling cylinder 1 is squeezed by the piston plate 9 and enters the air storage chamber 11 in one direction. The one-way blocking structure can be opened by operating the top outside the sampling cylinder 1;

[0031] The blocking mechanism 7 is used to block the connection between the shunt channel 13 and the air storage chamber 11. When the sampling tube 1 rotates, the blocking mechanism 7 is affected by the centrifugal force to block the upper end of the shunt channel 13. The blocking mechanism 7 automatically opens when the sampling tube 1 stops rotating.

[0032] Based on the above structure, when sampling is carried out, the motor 2 drives the sampling cylinder 1 to rotate through the connecting bracket 3, and at the same time descends under the drive of the lead screw, and the centrifugal force of the blocking mechanism 7 affects the upper end of the blocking diversion channel 13, and the limit plate 81 shrinks in the sliding hole 14 under the action of centrifugal force and the elastic force of the third spring 82. In the process of the sample core entering the sampling cylinder 1, the sample core gradually pushes up the piston plate 9, so that the piston plate 9 compresses the upper air and squeezes the one-way blocking structure to open it, so that the air enters the air storage chamber 11 from the through hole 12. After the air is pressed into the air storage chamber 11, the air pressure increases. After the sampling is completed and the motor 2 stops, the one-way blocking structure automatically blocks the through hole 12 and seals the air storage chamber 11 at the same time. The blocking mechanism 7 opens automatically, allowing the pressurized gas in the air storage chamber 11 to enter the diversion channel 13, and after moving to the lower end of the diversion channel 13, it squeezes the limit plate 81, so that the limit plate 81 overcomes the elastic force of the third spring 82 under the action of pressure and pops out, achieving the purpose of automatically limiting the sample core by inserting the limit plate 81 under the sample core, thereby eliminating the need for manual operation to retain the sample core, and avoiding the presence of a large air pressure (or the influence of the spring force) on the inner top of the sampling tube 1 storing the sample core, resulting in difficulty in entering the sample core during the sampling stage, the soil under the sample core being squeezed hard and difficult to insert into the limiting structure, and the need to apply a large pressure during sampling, etc., making it more convenient and quick to use.

[0033] Furthermore, the blocking mechanism 7 includes a fixed plate 71, a blocking block 72 and a second spring 73. The fixed plate 71 is fixed to the inner bottom wall of the air storage chamber 11, and the blocking block 72 is slidably connected to the inner bottom wall of the air storage chamber 11. The two ends of the second spring 73 are respectively fixed to the side walls on which the fixed plate 71 and the blocking block 72 are close to each other. The second spring 73 applies a force to the blocking block 72 to slide toward the side of the fixed plate 71.

[0034] If locking sill 752 snap on the positioning plate 74 away from that locking sill 71, then lock core 71 is in the locking sill 75, and locking sill 71 from the hinge parts 72 of one end is fixed with the hinge parts 72 of one end.

[0035] Furthermore, the one-way blocking structure includes a blocking plate 4, a pull bolt 5 and a first spring 6. The lower end of the blocking plate 4 is plugged into the through hole 12, and the upper end of the blocking plate 4 is elastically connected to the top of the air storage chamber 11 through the first spring 6. The first spring 6 applies a downward force to the blocking plate 4.

[0036] A sliding sleeve 15 is fixed on the top of the sampling tube 1 , and the lower end of the sliding sleeve 15 extends into the air storage chamber 11 . The lower end of the pull bolt 5 is fixed to the upper end of the sealing plate 4 , and the upper end of the pull bolt 5 slides through the sliding sleeve 15 and extends above the sampling tube 1 .

[0037] Through the arrangement of the blocking plate 4, the pull bolt 5 and the first spring 6, when the sample core enters the sampling cylinder 1 and pushes the piston plate 9 upward, the piston plate 9 squeezes the upper air and applies a pressure greater than the elastic force of the first spring 6 to the blocking plate 4, thereby causing the blocking plate 4 to open upward, and the air enters the air storage chamber 11 through the through hole 12. After the piston plate 9 completes the squeezing, the air in the sampling cylinder 1 is pressed into the air storage chamber 11 by the piston plate 9. There is no pressurized gas under the blocking plate 4, and the elastic force of the first spring 6 causes the blocking plate 4 to block the through hole 12, thereby preventing the gas in the air storage chamber 11 from flowing back.

[0038] When the sample core in the sampling tube 1 is needed to be taken out, the staff only needs to pull the pull bolt 5 so that the pull bolt 5 drives the sealing plate 4 to move upward, so that the air storage chamber 11 is connected to the through hole 12 again, and the pressurized gas in the air storage chamber 11 enters the sampling tube 1 again. At this time, the air pressure in the sliding hole 14 is reduced, and the pressure is not enough to overcome the elastic force of the third spring 82 to press the limit plate 81 out, so that the limit plate 81 is reset and contracted in the sliding hole 14 under the elastic force of the third spring 82, and the sample core moves downward to the bottom of the sampling tube 1 under the push of the upper air pressure (due to friction factors and air pressure reduction, the sample core cannot be completely moved downward out of the sampling tube 1, but by reasonably designing the air pressure generated by the air, the sample core can be made to extend the lower end of the sampling tube 1 under the action of pressure). After the lower end of the sample core extends out of the sampling tube 1, the user can quickly take out the sample core, and the operation is also convenient and fast.

[0039] Furthermore, an active cavity 131 for accommodating the limit plate 81 and the third spring 82 is formed at the lower end of the diversion channel 13 connected to the sliding hole 14. The cross-sectional area of the active cavity 131 is larger than the cross-sectional area of the limit plate 81, and the end of the third spring 82 away from the limit plate 81 is fixed to the side wall of the active cavity 131.

[0040] Furthermore, the diversion channels 13 , the sliding holes 14 , the blocking mechanisms 7 and the limiting structures 8 are provided in multiple groups, and the multiple groups of diversion channels 13 , the sliding holes 14 , the blocking mechanisms 7 and the limiting structures 8 are distributed in a circular array along the axis of the sampling tube 1 .

[0041] The working principle of the present invention is as follows: in daily use, the motor 2 drives the sampling cylinder 1 to rotate through the connecting bracket 3, and at the same time descends under the drive of the lead screw, the fixed plate 71, the blocking block 72 and the second spring 73 rotate with the sampling cylinder 1, and the blocking block 72 is affected by the centrifugal force to overcome the elastic force of the second spring 73 and slide to the outside away from the central axis of the sampling cylinder 1, and moves to the upper end of the shunt channel 13, thereby sealing the shunt channel 13, and the limit plate 81 is contracted in the sliding hole 14 under the action of centrifugal force and the elastic force of the third spring 82. In the process of the sample core entering the sampling cylinder 1, the sample core gradually pushes up the piston plate 9, so that the piston plate 9 compresses the upper air and applies a pressure greater than the elastic force of the first spring 6 to the blocking plate 4, thereby causing the blocking plate 4 to open upward, and the air enters the storage through the through hole 12. After the air in the air storage chamber 11 is compressed into the air pressure increases, after the sampling is completed and the motor 2 stops, the air in the sampling tube 1 is pressed into the air storage chamber 11 by the piston plate 9. There is no pressurized gas at the lower part of the sealing plate 4. The elastic force of the first spring 6 will cause the sealing plate 4 to block the through hole 12 to prevent the gas in the air storage chamber 11 from flowing back. At the same time, the sealing block 72 moves toward the side of the fixed plate 71 under the elastic force of the second spring 73, thereby connecting the diversion channel 13 with the air storage chamber 11, so that the pressurized gas in the air storage chamber 11 enters the diversion channel 13 and squeezes the limiting plate 81 after moving to the lower end of the diversion channel 13. The limiting plate 81 overcomes the elastic force of the third spring 82 under the action of pressure and pops out, thereby achieving the purpose of automatically limiting the sample core by inserting the limiting plate 81 under the sample core.

[0042] When the sampling is completed and the sample core in the sampling tube 1 needs to be taken out, the staff only needs to pull the pull bolt 5 so that the pull bolt 5 drives the sealing plate 4 to move upward, so that the air storage chamber 11 is connected with the through hole 12 again, and the pressurized gas in the air storage chamber 11 enters the sampling tube 1 again. At this time, the air pressure in the slide hole 14 is reduced, and the pressure is not enough to overcome the elastic force of the third spring 82 to press the limit plate 81 out, so that the limit plate 81 is reset and contracted in the slide hole 14 under the elastic force of the third spring 82, and the sample core moves to the bottom of the sampling tube 1 under the push of the upper air pressure. After the lower end of the sample core extends out of the sampling tube 1, the user can quickly take out the sample core, and the operation is also convenient and fast.

[0043] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A road thickness detection sampling device, comprising a sampling cylinder (1), a motor (2) for driving the sampling cylinder (1) to rotate, and a connecting bracket (3) connected between the output shaft of the motor (2) and the top of the sampling cylinder (1), wherein a piston plate (9) is installed in the sampling cylinder (1) and slides vertically along the axis of the sampling cylinder (1), and is characterized in that: An air storage cavity (11) is formed at the top of the sampling cylinder (1), and a through hole (12) and a diversion channel (13) are provided at the bottom of the air storage cavity (11), wherein the through hole (12) is communicated with the inner cavity of the cylinder of the sampling cylinder (1), and the diversion channel (13) is provided on the cylinder wall of the sampling cylinder (1) and the lower end of the diversion channel (13) extends to the lower part of the sampling cylinder (1), and a sliding hole (14) is provided on the inner side of the sampling cylinder (1) and is communicated with the lower end of the diversion channel (13); A limiting structure (8) is slidably installed in the sliding hole (14), and the limiting structure (8) includes a limiting plate (81) and a third spring (82). The limiting plate (81) is slidably embedded in the sliding hole (14). The limiting plate (81) is elastically installed in the sliding hole (14) through the third spring (82). The third spring (82) applies a force to the limiting plate (81) to move away from the axis of the sampling tube (1); A one-way blocking structure and a blocking mechanism (7) are installed in the air storage chamber (11), and the one-way blocking structure is used to block the through hole (12), so that the air in the cylinder body of the sampling cylinder (1) enters the air storage chamber (11) in a one-way manner when the air is squeezed by the piston plate (9); The blocking mechanism (7) is used to block the connection between the shunt channel (13) and the air storage chamber (11). When the sampling cylinder (1) rotates, the blocking mechanism (7) is affected by the centrifugal force to block the upper end of the shunt channel (13). When the sampling cylinder (1) stops rotating, the blocking mechanism (7) automatically opens.

2. A road surface thickness detection sampling device according to claim 1, characterized in that: The blocking mechanism (7) comprises a fixed plate (71), a blocking block (72) and a second spring (73); the fixed plate (71) is fixed to the inner bottom wall of the air storage chamber (11); the blocking block (72) is slidably connected to the inner bottom wall of the air storage chamber (11); two ends of the second spring (73) are respectively fixed to the side walls of the fixed plate (71) and the blocking block (72) on a side close to each other; the second spring (73) applies a force to the blocking block (72) to slide toward the side of the fixed plate (71).

3. A road thickness detection sampling device according to claim 2, characterized in that: The one-way blocking structure comprises a blocking plate (4) and a first spring (6); the lower end of the blocking plate (4) is plugged into the through hole (12); the upper end of the blocking plate (4) is elastically connected to the top of the air storage chamber (11) via the first spring (6); and the first spring (6) applies a downward force to the blocking plate (4).

4. A road surface thickness detection sampling device according to claim 3, characterized in that: A sliding sleeve (15) is fixed to the top of the sampling tube (1), and the lower end of the sliding sleeve (15) extends into the air storage cavity (11); The one-way blocking structure further comprises a pull bolt (5), the lower end of the pull bolt (5) being fixed to the upper end of the blocking plate (4), and the upper end of the pull bolt (5) slidingly passing through the sliding sleeve (15) and extending to the top of the sampling tube (1).

5. The road surface thickness detection sampling device according to claim 1, characterized in that: The lower end of the diversion channel (13) communicating with the sliding hole (14) is formed with an active cavity (131) for accommodating the limit plate (81) and the third spring (82). The cross-sectional area of the active cavity (131) is larger than the cross-sectional area of the limit plate (81). One end of the third spring (82) away from the limit plate (81) is fixed to the side wall of the active cavity (131).

6. A road surface thickness detection and sampling device according to any one of claims 1 to 5, characterized in that: The diversion channels (13), the sliding holes (14), the blocking mechanisms (7), and the limiting structures (8) are provided in multiple groups, and the multiple groups of the diversion channels (13), the sliding holes (14), the blocking mechanisms (7), and the limiting structures (8) are distributed in a circular array along the axis of the sampling tube (1).

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