Dam compaction detection device

Abstract

The present invention discloses a dam body compaction detection device, including: a base, on which a through hole and a pair of slide grooves are arranged; two first screw rods, on which a first nut seat is respectively arranged; two first driving devices, which are respectively connected to the two first screw rods; a punching device, which includes: two second screw rods, on which a second nut seat is respectively arranged; two second driving devices, which are respectively connected to the two second screw rods; a first lifting plate, which is connected to the two second nut seats and has two limit plates arranged thereon; a punching member, which is arranged on the first lifting plate; a detection device body, which includes: a moving plate, on which a pair of sliders are arranged at the bottom; a lifting device, which is arranged on the moving plate; a second lifting plate, which is arranged on the lifting device; and a nuclear density meter, whose base is fixed on the second lifting plate. After the punching is completed, the present invention only needs to move the punching mechanism upwards to align the probe with the hole, which can improve the detection efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of compaction detection, and more specifically, to a dam body compaction detection device. Background Art

[0002] The nuclear density meter can detect the compaction, water content and void ratio of the dam body to determine whether the compaction, water content and void ratio meet the design requirements and national standards.

[0003] When testing the compaction of the dam body, it is necessary to first drill a hole at the location to be tested, and then extend the probe of the nuclear density meter into the hole for testing. However, the existing dam body compaction detection device, such as application number 202021173680.4, a dam body compaction detection device, when testing the compaction of the dam body, places the base on the surface of the dam body, and at the same time makes the movable plate slide along the slideway to the position where the hole needs to be drilled, and turns on the drilling mechanism so that the drill rod can move downward and pass through the through hole to drill into the dam body, thereby completing the drilling work, and then marks the drilling position through the marking component, and then moves the movable plate away to expose the hole, and then moves the positioning frame to the position where the probe of the nuclear density meter can be aligned with the hole, and then turns on the lifting mechanism, the lifting mechanism moves the base of the nuclear density meter downward and places it on the surface of the dam body, and then moves the probe downward so that the probe can smoothly extend into the hole for testing. However, after the punching is completed and the punching mechanism is moved upward, the movable plate must be moved and the holes must be marked, which results in low detection efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a dam body compaction detection device. After the drilling is completed, it is only necessary to move the drilling mechanism upward without marking the holes, so that the nuclear density meter can be moved until its probe is aligned with the holes, which can improve the detection efficiency.

[0005] In order to achieve these purposes and other advantages of the present invention, a dam body compaction detection device is provided, comprising:

[0006] The base is in the shape of an elongated strip, and a through hole is arranged on the base along its length direction, and the through hole penetrates the upper and lower surfaces of the base; a pair of slide grooves are arranged on the top of the base, and the slide grooves are arranged along the length direction of the base, and the through hole is located between the pair of slide grooves;

[0007] Two first screw rods are arranged on the base and extend along the length direction of the base, and a first nut seat is arranged on each of the two first screw rods;

[0008] Two first driving devices, which are respectively connected to one end of the two first screw rods and are used to drive the two first screw rods to rotate respectively;

[0009] A punching device, comprising:

[0010] Two second screw rods are respectively arranged vertically, and a second nut seat is respectively arranged on the two second screw rods;

[0011] Two second driving devices are respectively arranged on the two first nut seats and respectively connected to the bottoms of the two second screw rods, and are used to respectively drive the two second screw rods to rotate;

[0012] A first lifting plate, which is arranged above the through hole, is in the shape of a rectangular parallelepiped and includes a first side wall and a second side wall, and a third side wall and a fourth side wall, which are arranged opposite to each other. The third side wall and the fourth side wall are arranged at intervals along the length direction of the through hole. The first side wall and the second side wall are respectively fixedly connected to the two second nut seats. A limiting plate is respectively arranged on the third side wall and the fourth side wall. The two limiting plates are respectively detachably connected to the third side wall and the fourth side wall.

[0013] A punching member, which is arranged on the third side wall or the fourth side wall, and the through hole does not interfere with the up and down movement of the drill rod of the punching member;

[0014] The detection device body is located between the two first nut seats, and the detection device body includes:

[0015] The movable plate has a pair of sliders at the bottom, the sliders match the pair of slide grooves and are respectively located in the pair of slide grooves, and the sliders can move along the pair of slide grooves;

[0016] A lifting device, which is arranged on the movable plate;

[0017] A second lifting plate, which is arranged on the lifting device and is driven to move up and down by the lifting device;

[0018] A nuclear density meter, whose base is fixed on the second lifting plate; when the lifting device drives the nuclear density meter downward, the base can pass through the through hole and rest on the ground, and the carbon rod of the nuclear density meter can pass through the through hole; when the first lifting plate moves to the highest position and the two limit plates are not fixed on the third side wall and the fourth side wall, the detection device body can pass from under the first lifting plate and the punching member along the length direction of the base; when the first lifting plate moves to the highest position, the two limit plates are respectively fixed on the third side wall and the fourth side wall, the detection device body is located below the first lifting plate and the punching member, and is partially stuck between the two limit plates, and the carbon rod can be opposite to the hole drilled by the drill pipe.

[0019] Preferably, in the dam body compaction detection device, the dam body compaction detection device further comprises:

[0020] Two first guide rods are arranged on the base, extend along the length direction of the base, and pass through the two first nut seats respectively;

[0021] The punching device also includes:

[0022] The two second guide rods are respectively arranged vertically, the bottoms of the two second guide rods are respectively fixedly connected to the two first nut seats, and the tops of the two second guide rods respectively pass through the two second nut seats.

[0023] Preferably, in the dam body compaction detection device, a fixed plate is respectively provided on the third side wall and the fourth side wall, a limit plate is respectively passed through the two fixed plates, a first limit block is provided on the top of each limit plate, and the two first limit blocks are both placed on the fixed plates corresponding thereto, so that the two limit plates are respectively detachably connected to the third side wall and the fourth side wall.

[0024] Preferably, in the dam body compaction detection device, the drill rod is located below the first lifting plate.

[0025] Preferably, in the dam body compaction detection device, the cross-section of the slideway is an inverted T-shape, and the base and the through hole are both rectangular and coaxially arranged.

[0026] Preferably, in the dam body compaction detection device, the height of the bottom surface of the base is lower than the height of the bottom surface of the second lifting plate.

[0027] Preferably, in the dam body compaction detection device, the movable plate and the second lifting plate are both in the shape of a rectangular parallelepiped, and the detection device body further comprises:

[0028] Four third guide rods are respectively arranged vertically, the bottoms of the four third guide rods are respectively fixedly connected to the movable plate, and the tops of the four third guide rods respectively pass through the four corners of the second lifting plate;

[0029] A guard plate is fixed on the top of the four third guide rods; when the second lifting plate moves to the highest position, the second lifting plate abuts against the guard plate, and the nuclear density meter is located below the guard plate; when the first lifting plate moves to the highest position, the two limit plates are respectively fixed on the third side wall and the fourth side wall, the guard plate is located below the first lifting plate, and when it is stuck between the two limit plates, the height of the top of the nuclear density meter is lower than the height of the bottom of the two limit plates, and the carbon rod can be opposite to the hole drilled by the drill rod.

[0030] Preferably, in the dam body compaction detection device, when the guard plate is stuck between the two limit plates, the two limit plates are not in contact with other parts of the detection device body.

[0031] Preferably, in the dam body compaction detection device, the base and the movable plate are not opposite to each other.

[0032] Preferably, in the dam body compaction detection device, a second limit block is respectively provided on the top of the two second guide rods, and when the first lifting plate moves to the highest position, the two second nut seats respectively abut against the two second limit blocks.

[0033] The method for using the dam body compaction detection device comprises the following steps:

[0034] Place the base on the surface of the dam body, and at the same time, make the two first driving devices drive the two first screw rods to rotate respectively, so that the first lifting plate and the punching piece are moved to the position where the holes need to be punched along the extension direction of the first screw rod, and then open the punching piece, and at the same time, the two second driving devices drive the two second screw rods to rotate respectively, so that the first lifting plate and the punching piece are moved downward, and after the punching work is completed, the two second driving devices drive the two second screw rods to rotate respectively, so that the first lifting plate and the punching piece move upward to the highest position and expose the hole, then remove the limit plate close to the detection device body, and then push the detection device body toward the other limit plate. The body is moved until the detection device body contacts the limit plate, and then the removed limit plate is installed so that the detection device body is located below the first lifting plate and the punching piece, and is partially stuck between the two limit plates. At this time, the probe of the nuclear density meter is aligned with the position of the hole, and then the lifting device is turned on. The lifting device moves the second lifting plate and the base of the nuclear density meter downward and places the base of the nuclear density meter on the surface of the dam body, and then moves the probe downward, so that the probe can be smoothly extended into the hole for detection. After the detection is completed, the lifting device moves the second lifting plate and the base of the nuclear density meter upward, and then removes the two limit plates, and then repeats the process.

[0035] The present invention has at least the following beneficial effects:

[0036] After the punching is completed, the present invention does not need to mark the holes. It only needs to move the punching mechanism upward and move the detection device body to below the first lifting plate and the punching member, and make the guard plate stuck between the two limit plates, so that the nuclear density meter can be moved until its probe is aligned with the hole, which can improve the detection efficiency.

[0037] The present invention moves the punching member and the first lifting plate to the highest position and removes the two limit plates, so that the punching device and the detection device body do not interfere with each other during movement, and can move the punching device and the detection device body to different positions of the through hole, making it more convenient to use.

[0038] During the drilling process, the drilling machine can be rotated downward, so that the drill rod passes through the through hole and enters the dam body, thereby improving the drilling efficiency.

[0039] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a structural schematic diagram of a dam body compaction detection device according to an embodiment of the present invention;

[0041] Figure 2 is a schematic structural diagram of a guard plate clamped between two limit plates according to an embodiment of the present invention;

[0042] Figure 3 Schematic diagram of the structure of a base according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0044] It should be noted that, in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 on the present invention.

[0045] like Figures 1 to 3 As shown, the present invention provides a dam body compaction detection device, comprising:

[0046] The base 1 is in the shape of a long strip, and the base 1 has a Figure 3 A through hole 101 is provided in the left and right directions shown in the figure, and the through hole 101 passes through the upper and lower surfaces of the base 1; a pair of slide grooves 102 are provided on the top of the base 1, and the slide grooves 102 are arranged along the length direction of the base 1, and the through hole 101 is located between the pair of slide grooves 102;

[0047] Two first screw rods 2 are arranged on the base 1 and extend along the length direction of the base 1. A first nut seat 201 is respectively arranged on the two first screw rods 2. The first nut seat 201 and the first screw rod 2 form a ball screw pair;

[0048] Two first driving devices, which are respectively connected to one end of the two first screw rods 2, and are used to drive the two first screw rods 2 to rotate respectively;

[0049] A punching device, comprising:

[0050] Two second screw rods 3 are respectively arranged vertically, and a second nut seat 301 is respectively arranged on the two second screw rods 3, and the second nut seat 301 and the second screw rod 3 form a ball screw pair;

[0051] Two second driving devices, which are respectively arranged on the two first nut seats 201 and respectively connected to the bottoms of the two second screw rods 3, and are used to drive the two second screw rods 3 to rotate respectively;

[0052] A first lifting plate 4 is arranged above the through hole 101, and a vertical projection of the first lifting plate 4 is located within the vertical projection of the through hole 101. The first lifting plate 4 is in a rectangular shape and includes a first side wall and a second side wall, and a third side wall and a fourth side wall, which are arranged opposite to each other. The third side wall and the fourth side wall are arranged at intervals along the length direction of the through hole 101. The first side wall and the second side wall are fixedly connected to two second nut seats 301 respectively. A limiting plate 401 is arranged on the third side wall and the fourth side wall respectively, and the two limiting plates 401 are detachably connected to the third side wall and the fourth side wall respectively;

[0053] A punching member 5, which is disposed on the third side wall or the fourth side wall, and a drill rod 501 of the punching member 5 can pass through the through hole 101, and the through hole 101 does not interfere with the up and down movement of the drill rod 501 of the punching member 5;

[0054] The detection device body is located between the two first nut seats 201, and the detection device body includes:

[0055] The movable plate 6 has a pair of sliders at the bottom thereof, the pair of sliders match the pair of slide grooves 102 and are respectively located in the pair of slide grooves 102, and the pair of sliders can move along the pair of slide grooves 102;

[0056] A lifting device, which is arranged on the movable plate 6;

[0057] A second lifting plate 7, which is arranged on the lifting device and is driven to move up and down by the lifting device;

[0058] The nuclear density meter 8, whose base 801 is fixed on the second lifting plate 7; when the lifting device drives the nuclear density meter 8 downward, the base 801 can pass through the through hole 101 and rest on the ground, and the carbon rod of the nuclear density meter 8 can pass through the through hole 101; when the first lifting plate 4 moves to the highest position and the two limit plates 401 are not fixed on the third side wall and the fourth side wall, the detection device body can pass from under the first lifting plate 4 and the punching member 5 along the length direction of the base 1; when the first lifting plate 4 moves to the highest position, the two limit plates 401 are respectively fixed on the third side wall and the fourth side wall, the detection device body is located below the first lifting plate 4 and the punching member 5, and is partially or completely stuck between the two limit plates 401, and the carbon rod can be opposite to the hole drilled by the drill rod 501.

[0059] The dam body compaction detection device provided in this solution, when detecting the compaction of the dam body, places the base 1 on the surface of the dam body, and at the same time, the two first driving devices respectively drive the two first screws 2 to rotate, so that the first lifting plate 4 and the punching member 5 are moved to the position where the holes need to be punched along the extension direction of the first screw 2, and then the punching member 5 is turned on, and at the same time, the two second driving devices respectively drive the two second screws 3 to rotate, so that the first lifting plate 4 and the punching member 5 are downward, so that the drill rod 501 can rotate and move downward at the same time and pass through the through hole 101 to drill into the dam body, thereby completing the punching work. After that, the two second driving devices respectively drive the two second screws 3 to rotate, so that the first lifting plate 4 and the punching member 5 move upward to the highest position and expose the hole, and then remove the limit plate 401 (such as the one close to the detection device body). Figure 2 As shown, the limit plate 401 on the right side is pushed toward the other limit plate 401 until the detection device body contacts the limit plate 401, and then the removed limit plate 401 is installed so that the detection device body is located below the first lifting plate 4 and the punching member 5, and is partially stuck between the two limit plates 401. At this time, the probe of the nuclear density meter 8 is aligned with the position of the hole, and then the lifting device is turned on. The lifting device moves the second lifting plate 7 and the base 801 of the nuclear density meter 8 downward and places the base 801 of the nuclear density meter 8 on the surface of the dam body, and then moves the probe downward, so that the probe can be smoothly extended into the hole for detection. After the detection is completed, the lifting device moves the second lifting plate 7 and the base 801 of the nuclear density meter 8 upward, and then removes the two limit plates 401, and then repeats continuously.

[0060] In another embodiment, in the dam body compaction detection device, the dam body compaction detection device further comprises:

[0061] Two first guide rods are arranged on the base 1 and extend along the length direction of the base 1 and pass through the two first nut seats 201 respectively; the first guide rods can play a guiding role during the movement of the first nut seats 201.

[0062] The punching device also includes:

[0063] The two second guide rods 9 are respectively arranged vertically, the bottoms of the two second guide rods 9 are respectively fixedly connected to the two first nut seats 201, and the tops pass through the two second nut seats 301 respectively. The second guide rods 9 can play a guiding role during the movement of the second nut seats 301.

[0064] In another embodiment, in the dam body compaction detection device, a fixed plate 402 is respectively provided on the third side wall and the fourth side wall, a limit plate 401 is respectively passed through the two fixed plates 402, a first limit block is provided on the top of each limit plate 401, and the two first limit blocks are placed on the corresponding fixed plates 402 so that the two limit plates 401 are respectively detachably connected to the third side wall and the fourth side wall. When it is necessary to remove the limit plate 401, the first limit block is lifted upwards until the limit plate 401 is separated from the fixed plate 402, and the limit plate 401 can be removed.

[0065] In another solution, in the dam body compaction detection device, the drill rod 501 is located below the first lifting plate 4 .

[0066] In another embodiment, in the dam body compaction detection device, the cross section of the slide chute 102 is an inverted T-shape, and the base 1 and the through hole 101 are both rectangular and coaxially arranged.

[0067] In another embodiment, in the dam body compaction detection device, the height of the bottom surface of the base 801 is lower than the height of the bottom surface of the second lifting plate 7 .

[0068] In another embodiment, in the dam body compaction detection device, the movable plate 6 and the second lifting plate 7 are both in the shape of a rectangular parallelepiped, and the detection device body further includes:

[0069] The four third guide rods 10 are respectively arranged vertically, the bottoms of the four third guide rods 10 are respectively fixedly connected to the movable plate 6, and the tops respectively pass through the four corners of the second lifting plate 7; the third guide rods 10 can play a guiding role during the movement of the second lifting plate 7.

[0070] The guard plate 11 is fixed on the top of the four third guide rods 10; when the second lifting plate 7 moves to the highest position, the second lifting plate 7 and the guard plate 11 are against each other, and the nuclear density meter 8 is located below the guard plate 11; when the first lifting plate 4 moves to the highest position, the two limit plates 401 are respectively fixed on the third side wall and the fourth side wall, the guard plate 11 is located below the first lifting plate 4, and when it is stuck between the two limit plates 401, the height of the top of the nuclear density meter 8 is lower than the height of the bottom of the two limit plates 401, and the carbon rod can be opposite to the hole drilled by the drill rod 501.

[0071] In another embodiment, in the dam compaction detection device, when the guard plate 11 is stuck between the two limit plates 401, the two limit plates 401 do not contact other parts of the detection device body. By providing the guard plate 11, it is possible to prevent other parts of the detection device body from colliding with the limit plates 401 and the drill rod 501 and being damaged.

[0072] In another embodiment, in the dam body compaction detection device, the base 801 is not opposite to the movable plate 6, so that the movable plate 6 does not restrict the base 801 from moving downward.

[0073] In another embodiment, in the dam compaction detection device, a second limit block is respectively provided on the top of the two second guide rods 9, and when the first lifting plate 4 moves to the highest position, the two second nut seats 301 respectively abut against the two second limit blocks.

[0074] The method for using the dam body compaction detection device comprises the following steps:

[0075] Place the base on the surface of the dam body, and at the same time, make the two first driving devices drive the two first screw rods to rotate respectively, so that the first lifting plate and the punching piece are moved to the position where the holes need to be punched along the extension direction of the first screw rod, and then open the punching piece, and at the same time, the two second driving devices drive the two second screw rods to rotate respectively, so that the first lifting plate and the punching piece are moved downward, and after the punching work is completed, the two second driving devices drive the two second screw rods to rotate respectively, so that the first lifting plate and the punching piece move upward to the highest position and expose the hole, then remove the limit plate close to the detection device body, and then push the detection device body toward the other limit plate. The body is moved until the detection device body contacts the limit plate, and then the removed limit plate is installed so that the detection device body is located below the first lifting plate and the punching piece, and is partially stuck between the two limit plates. At this time, the probe of the nuclear density meter is aligned with the position of the hole, and then the lifting device is turned on. The lifting device moves the second lifting plate and the base of the nuclear density meter downward and places the base of the nuclear density meter on the surface of the dam body, and then moves the probe downward, so that the probe can be smoothly extended into the hole for detection. After the detection is completed, the lifting device moves the second lifting plate and the base of the nuclear density meter upward, and then removes the two limit plates, and then repeats the process.

[0076] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A dam compaction detection device, characterized in that: include: The base is in the shape of an elongated strip, and a through hole is arranged on the base along its length direction, and the through hole penetrates the upper and lower surfaces of the base; a pair of slide grooves are arranged on the top of the base, and the slide grooves are arranged along the length direction of the base, and the through hole is located between the pair of slide grooves; Two first screw rods are arranged on the base and extend along the length direction of the base, and a first nut seat is arranged on each of the two first screw rods; Two first driving devices, which are respectively connected to one end of the two first screw rods and are used to drive the two first screw rods to rotate respectively; A punching device, comprising: Two second screw rods are respectively arranged vertically, and a second nut seat is respectively arranged on the two second screw rods; Two second driving devices are respectively arranged on the two first nut seats and respectively connected to the bottoms of the two second screw rods, and are used to respectively drive the two second screw rods to rotate; A first lifting plate, which is arranged above the through hole, is in the shape of a rectangular parallelepiped and includes a first side wall and a second side wall, and a third side wall and a fourth side wall, which are arranged opposite to each other. The third side wall and the fourth side wall are arranged at intervals along the length direction of the through hole. The first side wall and the second side wall are respectively fixedly connected to the two second nut seats. A limiting plate is respectively arranged on the third side wall and the fourth side wall. The two limiting plates are respectively detachably connected to the third side wall and the fourth side wall. A punching member, which is arranged on the third side wall or the fourth side wall, and the through hole does not interfere with the up and down movement of the drill rod of the punching member; The detection device body is located between the two first nut seats, and the detection device body includes: The movable plate has a pair of sliders at the bottom, the sliders match the pair of slide grooves and are respectively located in the pair of slide grooves, and the sliders can move along the pair of slide grooves; A lifting device, which is arranged on the movable plate; A second lifting plate, which is arranged on the lifting device and is driven to move up and down by the lifting device; A nuclear density meter, whose base is fixed on the second lifting plate; when the lifting device drives the nuclear density meter downward, the base can pass through the through hole and rest on the ground, and the carbon rod of the nuclear density meter can pass through the through hole; when the first lifting plate moves to the highest position and the two limit plates are not fixed on the third side wall and the fourth side wall, the detection device body can pass from under the first lifting plate and the punching member along the length direction of the base; when the first lifting plate moves to the highest position, the two limit plates are respectively fixed on the third side wall and the fourth side wall, the detection device body is located below the first lifting plate and the punching member, and is partially stuck between the two limit plates, and the carbon rod can be opposite to the hole drilled by the drill pipe.

2. The dam body compaction detection device according to claim 1, characterized in that: The dam body compaction detection device also includes: Two first guide rods are arranged on the base, extend along the length direction of the base, and pass through the two first nut seats respectively; The punching device also includes: The two second guide rods are respectively arranged vertically, the bottoms of the two second guide rods are respectively fixedly connected to the two first nut seats, and the tops of the two second guide rods respectively pass through the two second nut seats.

3. The dam body compaction detection device according to claim 1, characterized in that: A fixing plate is respectively arranged on the third side wall and the fourth side wall, a limiting plate is respectively passed through the two fixing plates, a first limiting block is arranged on the top of each limiting plate, and the two first limiting blocks are both placed on the fixing plates corresponding thereto, so that the two limiting plates are respectively detachably connected to the third side wall and the fourth side wall.

4. The dam body compaction detection device according to claim 1, characterized in that: The drill rod is located below the first lifting plate.

5. The dam body compaction detection device according to claim 1, characterized in that: The cross section of the slide groove is an inverted T-shape, and the base and the through hole are both rectangular and coaxially arranged.

6. The dam body compaction detection device according to claim 1, characterized in that: The height of the bottom surface of the base is lower than the height of the bottom surface of the second lifting plate, and the base is not opposite to the moving plate.

7. The dam body compaction detection device according to claim 2, characterized in that: The movable plate and the second lifting plate are both in the shape of a rectangular parallelepiped, and the detection device body further includes: Four third guide rods are respectively arranged vertically, the bottoms of the four third guide rods are respectively fixedly connected to the movable plate, and the tops of the four third guide rods respectively pass through the four corners of the second lifting plate; A guard plate is fixed on the top of the four third guide rods; when the second lifting plate moves to the highest position, the second lifting plate abuts against the guard plate, and the nuclear density meter is located below the guard plate; when the first lifting plate moves to the highest position, the two limit plates are respectively fixed on the third side wall and the fourth side wall, the guard plate is located below the first lifting plate, and when it is stuck between the two limit plates, the height of the top of the nuclear density meter is lower than the height of the bottom of the two limit plates, and the carbon rod can be opposite to the hole drilled by the drill rod.

8. The dam body compaction detection device according to claim 7, characterized in that: When the guard plate is stuck between the two limit plates, the two limit plates are not in contact with other parts of the detection device body.

9. The dam body compaction detection device according to claim 2, characterized in that: A second limit block is respectively arranged on the top of the two second guide rods. When the first lifting plate moves to the highest position, the two second nut seats respectively abut against the two second limit blocks.

10. The method for using the dam body compaction detection device according to claim 1, characterized in that: The following steps are involved: Place the base on the surface of the dam body, and at the same time, make the two first driving devices drive the two first screw rods to rotate respectively, so that the first lifting plate and the punching piece are moved to the position where the holes need to be punched along the extension direction of the first screw rod, and then open the punching piece, and at the same time, the two second driving devices drive the two second screw rods to rotate respectively, so that the first lifting plate and the punching piece are moved downward, and after the punching work is completed, the two second driving devices drive the two second screw rods to rotate respectively, so that the first lifting plate and the punching piece move upward to the highest position and expose the hole, then remove the limit plate close to the detection device body, and then push the detection device body toward the other limit plate. The body is moved until the detection device body contacts the limit plate, and then the removed limit plate is installed so that the detection device body is located below the first lifting plate and the punching piece, and is partially stuck between the two limit plates. At this time, the probe of the nuclear density meter is aligned with the position of the hole, and then the lifting device is turned on. The lifting device moves the second lifting plate and the base of the nuclear density meter downward and places the base of the nuclear density meter on the surface of the dam body, and then moves the probe downward, so that the probe can be smoothly extended into the hole for detection. After the detection is completed, the lifting device moves the second lifting plate and the base of the nuclear density meter upward, and then removes the two limit plates, and then repeats the process.

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