Cement-based material drilling and sampling device and working method

Abstract

The invention relates to a cement-based material drilling and sampling device, and belongs to the technical field of cement-based material sampling equipment.The cement-based material drilling and sampling device comprises a stand column perpendicular to a water tank and a transverse column connected with the stand column and parallel to the water tank, the transverse column is provided with a drilling machine provided with a drill bit, and the water tank is provided with a lifting unit independently controlled through a servo motor; the lifting unit is provided with a hinged rotating shaft connected with the sample box, a cement-based material sample can be drilled in an inclined state, a filter screen is arranged at the bottom of the sample box, sewage generated after drilling can be filtered and flows into a water tank to achieve cyclic utilization, and friction between the sample and the inner wall of a rotating head is reduced through the unique design of a drill bit; the push-pull rod and the pushing device are matched with the lifting unit to automatically take out a sample without manpower, the sample box is driven to incline through the lifting unit in the initial drilling stage, inclined drilling is conducted firstly, then vertical drilling is conducted, and the problems that a traditional cement-based material drilling and sampling machine is difficult to drill in the initial drilling process and shakes are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of cement-based material sampling equipment, and in particular relates to a cement-based material drilling sampling device and a working method. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Cement-based materials refer to engineering materials that use cement as a binder. Concrete and mortar are the most common cement-based materials. Laboratories often use cement-based material drilling and coring machines to test its composition, quality, and distribution of aggregates. However, drilling and sampling machines often cause debris and sewage splashing during operation. The drilled sample is easily stuck in the drill bit, and it is easy to damage the sample itself when it is removed by external force. When the drill bit vertically contacts the cement-based material sample, it is extremely difficult for the drill bit to drill into the sample due to the large contact area with the cement-based material surface. This will cause the drill bit and the drilling machine to shake and move violently, which will damage the drilling and sampling machine in the long run.

[0004] The existing patent document publication number CN106644568A discloses a cement-based material drilling sampler, which prevents the splash of debris and sewage by placing a protective cover on the drill bit. However, it does not take into account the problem that the sample after drilling is easily stuck in the drill bit and that when the drill bit vertically contacts the cement-based material sample, it is extremely difficult for the drill bit to drill into the sample due to the large contact area with the surface of the cement-based material. In addition, the friction between the cement-based material and the drill bit is too large to be removed by manpower. Summary of the invention

[0005] The object of the present invention is to provide a cement-based material drilling sampling device which can solve at least one of the above-mentioned technical problems.

[0006] To achieve the above-mentioned purpose, the present invention provides a cement-based material drilling sampling device, including a water tank, a sample box, and a drilling rig. The water tank is a rectangular structure, and a column and a lifting unit perpendicular to the water tank are arranged in sequence from left to right along the length direction of the top surface of the rectangular block. The bottom of the lifting unit is fixedly connected to the water tank, and the top of the lifting unit is provided with a rotating shaft connected to the sample box. The bottom of the sample box is provided with an articulated rotating shaft, and the rotating shaft is rotatably connected to the articulated rotating shaft. The top of the column is vertically connected to a horizontal column parallel to the length direction of the water tank, and the drilling rig is arranged on the horizontal column and is perpendicular to the center point space of the sample box.

[0007] Furthermore, the column is a hollow structure, and a slide groove and a sliding rheostat are provided on the side of the column close to the sample box. A rubber wheel is provided at the bottom of the sliding rheostat to slide up and down in the slide groove provided on the column; a water pump for pumping water from a water tank is provided above the inside of the column, and a water pipe is connected between the water pump and the water tank.

[0008] Furthermore, the drilling rig is provided with a drill bit, the inner diameter of the lower section of the drill bit remains unchanged, the inner diameters of the middle section and the upper section are larger than the inner diameter of the lower section, the inner wall of the middle section and the inner wall of the upper section of the drill bit are provided with four slide rails arranged in a spatial cross along the moving direction of the drill bit, and a pushing device is provided inside the drill bit, and the pushing device extends four round rods through elastic parts to contact the slide rails on the inner wall of the drill bit, and the pushing device slides up and down inside the drill bit.

[0009] Furthermore, vertical through grooves are provided on the outer sides of the middle and upper sections of the drill bit, and push-pull rods are provided in the through grooves. Both ends of the push-pull rods are threaded and provided with push-pull rod nuts. The push-pull rods extend out of the drill bit and can slide up and down along the through grooves. A stretching device is provided between the push-pull rod nut and the drill bit, and a row of vertical circular holes is provided below the stretching device to realize connection with the sample box.

[0010] Furthermore, a circular hole larger than the outer diameter of the drill bit is provided in the circular hole in the middle of the bottom of the sample box, and a cylindrical rod extends from the inner wall of the circular hole for fixing the stretching device during sampling.

[0011] Furthermore, a filter screen is provided at the bottom of the sample box, the filter screen is provided below the circular hole of the sample box, and a flow guide pipe connected to the water tank is provided on the filter screen.

[0012] Furthermore, the guide pipe guides the filtered water to flow into the water tank.

[0013] Furthermore, the lifting unit includes a first lifting unit, a second lifting unit, a third lifting unit and a fourth lifting unit, and the lifting units are individually controlled by separate servo motors. The first lifting unit and the second lifting unit are arranged on the left side of the bottom of the sample box, and the third lifting unit and the fourth lifting unit are arranged on the right side of the bottom of the sample box.

[0014] Furthermore, a sliding cap is provided on the sliding rheostat, a connecting rod is provided on the left side of the sample box, and the connecting rod and the sliding cap are connected by a spring.

[0015] A working method of the above-mentioned cement-based material drilling sampling device comprises the following steps:

[0016] (1) Place the cement-based material sample into the sample box and fix the sample to the center of the sample box;

[0017] (2) The lifting unit is driven to rise by a servo motor, and the sample is raised horizontally to a position where it contacts the drill bit. The servo motors of the first lifting unit and the second lifting unit are controlled to lower one side of the sample box so that the sample box forms an acute angle with the horizontal plane. At this time, the head of the drill bit and the upper surface of the sample material are kept in an inclined state. Then the drilling speed of the drill is controlled to keep the drill running at a low speed of no more than 100 revolutions per minute. The water pump is also operated at a low power under the maximum resistance value of the sliding rheostat to control the flow rate of the water. After the drill bit drills into the right side of the sample to form a semicircular mark, the first lifting unit and the second lifting unit are controlled to rise to the same height as the third lifting unit and the fourth lifting unit. When a circular mark is drilled out and has a certain depth, the first lifting unit, the second lifting unit, the third lifting unit and the fourth lifting unit are controlled to rise at the same time until the drilling is completed.

[0018] (3) When the lifting unit is controlled by the servo motor to rise, the sample box is driven to move upward. The connecting rod at the bottom of the sample box drives the sliding cap of the sliding rheostat to slide upward through the spring, so that the drilling speed of the drill bit increases to the fastest and the water output of the water pump increases to the maximum. The sewage in the drilling process will flow into the water tank through the filter screen for recycling. When the sliding cap of the sliding rheostat moves to the top, that is, the resistance is the smallest, if the sample has not been drilled, the sliding rheostat as a whole will slide upward along the slide groove on the right side of the column driven by the bottom rubber wheel and always maintain the state of minimum resistance.

[0019] (4) After drilling is completed, install the stretching device on both sides of the push-pull rod and tighten the nuts on both sides to the appropriate position. Adjust the stretching device to the appropriate position so that the two extension rods at the bottom of the sample box pass through the circular holes at the bottom of the stretching device to connect the push-pull rod, the stretching device and the sample box. Control the lifting unit to descend so that the sample box pulls the push-pull rod downward while descending, and finally makes the push-pull rod contact with the pushing device, and the sample in the drill bit is ejected through the pushing device.

[0020] The beneficial effects of one or more of the above technical solutions are:

[0021] 1. The present invention sets a lifting unit. When the drill bit is close to the sample, the lifting unit on the same side is lowered to keep the head of the drill bit and the upper surface of the sample material in an inclined state. When a semicircular mark is drilled on the surface of the sample, the lifting unit on the falling side is raised to the same height as the lifting unit on the other side, so that a complete circle is gradually drilled. Subsequently, the two groups of lifting units rise simultaneously to drill the sample.

[0022] 2. The present invention controls the drilling speed of the drill bit and the speed of the water flow at the water outlet of the drill bit by setting a sliding rheostat, and controls the drilling speed of the drill bit to keep it at a slower speed when no hole is drilled or when drilling at an angle, thereby avoiding damage to the sample when the drill bit is drilling a hole for the first time, and controlling the water flow speed can achieve water conservation; through the set filter, the sewage flowing out when drilling the sample is filtered and then flows back into the water tank, thereby achieving the purpose of recycling and saving water resources.

[0023] 3. The present invention improves the drill bit. The inner diameter of the lower part of the drill bit remains unchanged, and the inner diameter of the middle and upper part increases over a longer distance, thereby greatly reducing the friction between the cement-based material sample and the inner wall of the drill bit. The displacement of the lifting unit and the sample box is used to pull the push-pull rod in the drill bit to contact the push device to push out the sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.

[0025] Figure 1 A three-dimensional diagram of a sampling device in an embodiment of the present invention;

[0026] Figure 2 A cross-sectional view of a sampling device according to an embodiment of the present invention from a front view;

[0027] Figure 3 A side view of a drill bit in an embodiment of the present invention;

[0028] Figure 4 In the embodiment of the present invention Figure 3 AA section view;

[0029] Figure 5 This is a schematic diagram of a pushing device in an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of a lifting unit in an embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of a sample box in an embodiment of the present invention;

[0032] Figure 8 This is a diagram showing the relative positions of the sliding rheostat and the right side of the column in an example of the present invention.

[0033] In the figure, 1. horizontal column; 2. drilling rig; 3. drill bit; 4. sample box; 5. first lifting unit; 6. articulated rotating shaft; 7. second lifting unit; 8. roller; 9. water tank; 10. third lifting unit; 11. fourth lifting unit; 12. water pipe; 13. handle; 14. column; 15. water pump; 16. sliding rheostat; 17. spring; 18. adjustment screw; 19. filter; 20. guide tube; 21. push-pull rod; 22. stretching device; 23. push-pull rod nut; 24. pushing device; 25. rubber wheel. DETAILED DESCRIPTION

[0034] like Figure 1-Figure 8 As shown, an embodiment of the present invention describes a cement-based material drilling sampling device, which includes a water tank 9, a sample box 4 and a drilling rig 2.

[0035] like Figure 1 As shown, the water tank 9 is a rectangular structure, and a column 14 and a lifting unit perpendicular to the water tank are arranged in sequence from left to right along the length direction of the top surface of the rectangular parallelepiped. A rotating shaft connected to the sample box 4 is arranged on the top of the lifting unit, and a hinged rotating shaft 6 is arranged at the bottom of the sample box 4. The top of the column 14 is vertically connected to a horizontal column 1 parallel to the length direction of the water tank 9. The drilling rig 2 is arranged on the horizontal column 1 and is perpendicular to the center point space of the sample box 4; the four sides of the sample box 4 are respectively provided with adjustment screws 18 for fixing the sample and adjusting the position of the sample.

[0036] Specifically, the lifting unit includes a first lifting unit 5, a second lifting unit 7, a third lifting unit 10 and a fourth lifting unit 11. The lifting units are individually controlled by separate servo motors. The first lifting unit 5 and the second lifting unit 7 are arranged on the left side of the bottom of the sample box 4, and the third lifting unit 10 and the fourth lifting unit 11 are arranged on the right side of the bottom of the sample box 4.

[0037] like Figure 2 As shown, the interior of the column 14 is a hollow structure, and a slide groove and a sliding rheostat 16 are provided on the side of the column 14 close to the sample box 4. A rubber wheel 25 is provided at the bottom of the sliding rheostat 16 to slide up and down in the slide groove provided on the column 14; the rubber wheel 25 enables the sliding rheostat 16 to slide up and down along the slide groove on the side of the column 14 without falling; a handle 13 is provided on the outside away from the sample box 4.

[0038] A water pump 15 for pumping water from the water tank 9 is arranged above the interior of the column 14 . The water pump 15 is fixed in the column 14 by round rods extending from the upper, left and right directions. A water pipe 12 is connected between the water pump 15 and the water tank 9 .

[0039] like Figure 3As shown, the inner diameter of the lower section of the drill bit 3 remains unchanged, and the inner diameters of the middle section and the upper section are larger than the inner diameter of the lower section, which is beneficial to reducing the friction between the cement-based material sample and the inner wall of the drill bit 3 and reducing the difficulty of sampling. The inner wall of the middle section and the inner wall of the upper section of the drill bit 3 are provided with four slide rails arranged in a spatial cross along the moving direction of the drill bit 3. A push-pull rod 21 and a jacking device 24 are provided inside the drill bit 3 from top to bottom. The push-pull rod 21 slides up and down in the grooves on both sides of the drill bit 3 and has nuts on both sides to limit the left and right displacement of the push-pull rod so that it does not slide out of the drill bit. A groove slideway for the displacement of the jacking device 24 is provided below the push-pull rod, and the strength of the drill bit 3 itself is not affected.

[0040] like Figure 8 As shown, a sliding cap is also provided on the sliding rheostat 16, and a connecting rod is provided on the left side of the sample box 4. The connecting rod and the sliding cap are connected by a spring 17. Specifically, each circle of the sliding rheostat 16 is sealed with insulating glue, and a ceramic insulating tube is used to perform an insulating effect, so that each circle of the resistance wire cannot be mutually conductive. The power supply and the terminal, the resistance wire, the metal rod, and the metal rod nut form a series circuit, and the resistance of the sliding rheostat is adjusted by the sliding cap.

[0041] Specifically, the spring 17 connects the connecting rod extending from the bottom of the sample box 4 and the connecting rod on the sliding cap, and uses the flexibility of the spring 17 to enable the sample box 4 to achieve inclined drilling. When the sample box rises, the sliding cap of the sliding rheostat 16 is driven to move upward, thereby reducing the resistance, increasing the drilling speed of the drill bit, and increasing the water flow rate.

[0042] A circular hole larger than the outer diameter of the drill bit 3 is provided in the middle position of the bottom of the sample box 4, and a filter screen 19 is provided at the bottom of the sample box 4. The filter screen 19 is provided below the circular hole of the sample box 4. A guide pipe 20 connected to the water tank 9 is provided on the filter screen 19. The guide pipe 20 is used to guide the filtered water to flow into the water tank 9. A water outlet is provided at the bottom of the water tank 9, and rollers 8 are provided on the four corners below. The water pump 15 transports the water in the water tank 9 to the inner wall of the drill bit 3 through the water pipe 12. In the process of drilling cement-based material samples, the water flowing out of the drill bit 3 is first filtered by the filter screen 19, and finally flows into the water tank through the guide pipe 20 for recycling.

[0043] like Figure 3 and Figure 4 As shown, vertical through grooves are arranged on the outer sides of the middle section and the upper section of the drill bit 3, and a push-pull rod 21 is arranged through the through grooves. Both ends of the push-pull rod 21 are threaded and provided with push-pull rod nuts 23. The push-pull rod 21 extends out of the drill bit 3 and can slide up and down along the through grooves. A stretching device 22 is arranged between the push-pull rod nut 23 and the drill bit 3, and a row of vertical circular holes is arranged below the stretching device 22 to realize connection with the sample box 4.

[0044] Specifically, Figure 3 and Figure 7As shown, the stretching device 22 is distributed between the drill bit 3 and the push-pull rod nut 23 and can be detachably connected. It is removed when drilling and installed on both sides of the push-pull rod 21 when sampling and is limited to left and right displacement by the push-pull rod nut 23. It is mainly used to connect the stretching device 22 with the rod set in the circular hole of the sample box 4 when the sample box 4 descends, so that the push-pull rod 21 is pulled downward with the sample box 4 to push out the sample in the drill bit 3 to complete the sampling.

[0045] like Figure 5 As shown, the push device 24 in the drill bit is composed of a cylindrical vertical rod in the middle, an elastic member and a cylindrical cross bar. The elastic member extends from the middle of the vertical rod to the surrounding cross-shaped, and fixes four cylindrical cross bars in four vertical groove slideways in the drill bit to slide up and down.

[0046] The working method of the drilling device mentioned above in this application:

[0047] (1) Place a sample of cement-based material into the sample box 4 and fix the sample to the center of the sample box 4;

[0048] (2) The lifting unit is driven to rise by a servo motor, and the sample is horizontally lifted to a position where it contacts the drill bit 3. The servo motors of the first lifting unit 5 and the second lifting unit 7 are controlled to lower one side of the sample box 4 so that the sample box 4 forms an acute angle with the horizontal plane. At this time, the head of the drill bit 3 and the upper surface of the sample material are kept in an inclined state. Then the drilling speed of the drill rig 2 is controlled to keep the drill rig 2 rotating at a low speed of no more than 100 revolutions per minute. The water pump 15 also operates at a low power under the maximum resistance value of the sliding rheostat 16 to control the flow rate of the water. After the drill bit 3 drills into the right side of the sample to form a semicircular mark, the first lifting unit 5 and the second lifting unit 7 are controlled to rise to the same height as the third lifting unit 10 and the fourth lifting unit 11. When a circular mark is drilled out and has a certain depth, the first lifting unit 5, the second lifting unit 7, the third lifting unit 10 and the fourth lifting unit 11 are finally controlled to rise simultaneously until the drilling is completed.

[0049] (3) When the lifting unit is controlled by the servo motor to rise, the sample box 4 is driven to move upward. The connecting rod at the bottom of the sample box 4 drives the sliding cap of the sliding rheostat 16 to slide upward through the spring 17, so that the drilling speed of the drill bit 3 increases until it reaches the fastest speed that the drilling machine 2 can provide. At the same time, the water output of the water pump 15 increases to the maximum; the sewage in the drilling process will flow into the water tank 9 through the filter 19 for recycling; when the sliding cap of the sliding rheostat 16 moves to the top, that is, when the resistance is the smallest, if the sample has not been drilled, the sliding rheostat 16 as a whole will slide upward along the slide groove on the right side of the column 14 driven by the bottom rubber wheel 25, and always maintain the state of minimum resistance;

[0050] (4) After drilling is completed, install the stretching device 22 on both sides of the push-pull rod 21 and screw the push-pull rod nuts 23 on both sides to the appropriate position. Adjust the stretching device 22 to the appropriate position so that the two protruding rods at the bottom of the sample box 4 pass through the circular holes at the bottom of the stretching device 22 to connect the push-pull rod 21, the stretching device 22 and the sample box 4. Control the lifting unit to descend so that the sample box 4 pulls the push-pull rod 21 downward while descending, and finally makes the push-pull rod 21 contact with the pushing device 24, so that the sample in the drill bit 3 is pushed out by the pushing device 24.

[0051] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A cement-based material drilling sampling device, comprising a water tank, a sample box and a drilling rig, characterized in that: The water tank is a rectangular structure, and columns and a lifting unit perpendicular to the water tank are arranged in sequence from left to right along the length direction of the top surface of the rectangular block. The bottom of the lifting unit is fixedly connected to the water tank, and the top of the lifting unit is provided with a rotating shaft connected to the sample box. The bottom of the sample box is provided with an articulated rotating shaft, and the rotating shaft is rotatably connected to the articulated rotating shaft. The top of the column is vertically connected to a horizontal column parallel to the length direction of the water tank, and the drilling rig is arranged on the horizontal column and is perpendicular to the center point space of the sample box.

2. A cement-based material drilling sampling device as claimed in claim 1, characterized in that: The column is a hollow structure, and a slide groove and a sliding rheostat are arranged on the side of the column close to the sample box. A rubber wheel is arranged at the bottom of the sliding rheostat to slide up and down in the slide groove arranged on the column; a water pump that draws water from the water tank is arranged above the inside of the column, and a water pipe is connected between the water pump and the water tank.

3. A cement-based material drilling sampling device as claimed in claim 1, characterized in that: The drilling rig is provided with a drill bit, the inner diameter of the lower section of the drill bit remains unchanged, the inner diameters of the middle section and the upper section are larger than the inner diameter of the lower section, the inner wall of the middle section and the inner wall of the upper section of the drill bit are provided with four slide rails arranged in a spatial cross along the moving direction of the drill bit, and a pushing device is provided inside the drill bit, and the pushing device extends four round rods through an elastic part to contact the slide rails on the inner wall of the drill bit, and the pushing device slides up and down inside the drill bit.

4. A cement-based material drilling sampling device as claimed in claim 3, characterized in that: Vertical through grooves are arranged on the outer sides of the middle section and the upper section of the drill bit, and push-pull rods are arranged in the through grooves. Both ends of the push-pull rods are threaded and provided with push-pull rod nuts. The push-pull rods extend out of the drill bit and can slide up and down along the through grooves. A stretching device is arranged between the push-pull rod nut and the drill bit, and a row of vertical circular holes is arranged below the stretching device to realize connection with the sample box.

5. A cement-based material drilling sampling device as claimed in claim 1, characterized in that: A circular hole larger than the outer diameter of the drill bit is arranged in the circular hole at the middle position of the bottom of the sample box, and a cylindrical rod extends out from the inner wall of the circular hole to fix the stretching device when sampling.

6. A cement-based material drilling sampling device as claimed in claim 1, characterized in that: A filter screen is arranged at the bottom of the sample box, the filter screen is arranged below the circular hole of the sample box, and a flow guide pipe connected to the water tank is arranged on the filter screen.

7. A cement-based material drilling sampling device as claimed in claim 6, characterized in that: The guide pipe guides the filtered water to flow into the water tank.

8. A cement-based material drilling sampling device as claimed in claim 1, characterized in that: The lifting unit includes a first lifting unit, a second lifting unit, a third lifting unit and a fourth lifting unit, and the lifting units are individually controlled by separate servo motors. The first lifting unit and the second lifting unit are arranged on the left side of the bottom of the sample box, and the third lifting unit and the fourth lifting unit are arranged on the right side of the bottom of the sample box.

9. A cement-based material drilling sampling device as claimed in claim 2, characterized in that: A sliding cap is arranged on the sliding rheostat, a connecting rod is arranged on the left side of the sample box, and the connecting rod and the sliding cap are connected by a spring.

10. A method for operating the cement-based material drilling sampling device according to any one of claims 1 to 9, characterized in that: The following steps are involved: (1) Place the cement-based material sample into the sample box and fix the sample to the center of the sample box; (2) The lifting unit is driven to rise by a servo motor, and the sample is raised horizontally to a position where it contacts the drill bit. The servo motors of the first lifting unit and the second lifting unit are controlled to lower one side of the sample box so that the sample box forms an acute angle with the horizontal plane. At this time, the head of the drill bit and the upper surface of the sample material are kept in an inclined state. Then the drilling speed of the drill is controlled to keep the drill running at a low speed of no more than 100 revolutions per minute. The water pump is also operated at a low power under the maximum resistance value of the sliding rheostat to control the flow rate of the water. After the drill bit drills into the right side of the sample to form a semicircular mark, the first lifting unit and the second lifting unit are controlled to rise to the same height as the third lifting unit and the fourth lifting unit. When a circular mark is drilled out and has a certain depth, the first lifting unit, the second lifting unit, the third lifting unit and the fourth lifting unit are controlled to rise at the same time until the drilling is completed. (3) When the lifting unit is controlled by the servo motor to rise, the sample box is driven to move upward. The connecting rod at the bottom of the sample box drives the sliding cap of the sliding rheostat to slide upward through the spring, so that the drilling speed of the drill bit increases to the fastest and the water output of the water pump increases to the maximum. The sewage in the drilling process will flow into the water tank through the filter screen for recycling. When the sliding cap of the sliding rheostat moves to the top, that is, the resistance is the smallest, if the sample has not been drilled, the sliding rheostat as a whole will slide upward along the slide groove on the right side of the column driven by the bottom rubber wheel and always maintain the state of minimum resistance. (4) After drilling is completed, install the stretching device on both sides of the push-pull rod and tighten the nuts on both sides to the appropriate position. Adjust the stretching device to the appropriate position so that the two extension rods at the bottom of the sample box pass through the circular holes at the bottom of the stretching device to connect the push-pull rod, the stretching device and the sample box. Control the lifting unit to descend so that the sample box pulls the push-pull rod downward while descending, and finally makes the push-pull rod contact with the pushing device, and the sample in the drill bit is ejected through the pushing device.

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