A core ejection type concrete drilling machine

Abstract

A sample core ejection type concrete drilling machine comprises a bottom plate and an adjusting column vertically arranged above the bottom plate, a connecting block is vertically slidably provided on the adjusting column, a drilling sampling device is provided on one side of the connecting block, the drilling sampling device comprises a shell connected to the connecting block and a drill bit vertically and rotatably arranged at the lower side thereof, a power device is also connected to the shell, the power device is transmission-connected to the drill bit through a transmission part and can drive the drill bit to rotate, the drill bit is a hollow columnar structure that passes through from top to bottom, and the position where the drill bit is installed in the shell is in a vertical through state, a connecting arm is also provided at the upper end of the adjusting module, the connecting arm is located above the shell, a vertically arranged push rod is connected thereto, the upper end of the push rod is connected to the connecting arm, and the lower end passes downward through the shell and extends into the drill bit, after the drilling is completed, the sample core inside the drill bit can be taken out by only using the push rod, and because the lower end of the push rod contacts the top of the sample core, the integrity of the sample core is also guaranteed, making the sample core removal work smoother.

Description

Technical Field

[0001] The invention relates to the technical field of engineering machinery, in particular to a core ejection type concrete drilling machine. Background Art

[0002] Concrete drilling machines have two main uses. One is as test equipment, which is used to drill holes in concrete buildings and take cores, and conduct physical and chemical testing on the sampled cores. Before the concrete produced by the applicant leaves the factory, it is necessary to cast the concrete in a trial mold, and use the drilling machine to drill sample cores on the trial mold for inspection to determine whether the concrete is qualified or to judge the grade of the concrete. At the same time, drilling machines are also widely used in test work such as coring of concrete pavements or coring of house walls; the second is as a construction machinery, used for drilling work in construction, such as installation of road spikes, road piles and bridge drilling, or drilling of integrated house pile foundations, etc., and are widely used in engineering construction fields such as transportation and building construction.

[0003] The existing concrete drilling machine devices have a fixed cylindrical drill bit structure and are all connected to the power device by transmission at the top. After drilling, the core inside is extremely difficult to remove due to the high rigidity of the concrete. Generally, the drill bit needs to be raised, and the drill bit needs to be hit with a metal stick or other metal products, and other tools are used to buckle the core out. Not only is it difficult to remove, but when the core is needed as a sample core for testing, it is also easy to damage the sample core. Based on this, Chinese patent CN201720666207.1 discloses a concrete core drilling machine with a separation device. The separation device is located below the drill bit, and a hole is provided in the middle for the drill bit to pass through. The sampling ring has several clamping parts along the circumference of the sampling ring. The device needs to move the drill bit to a predetermined position, and then use the short groove at the lower end of the drill bit to press the clamping part against the sample core, and use the clamping effect to pull out the sample core, which is more troublesome to use. At the same time, since the clamping position of the clamping part of the device is located at the end of the sample core, when the clamping force is too large, it is easy to damage the sample core and make it impossible to remove the sample core. When the clamping force is too small, it is impossible to overcome the rigidity of the sample core to remove the sample core, which makes it extremely difficult to control. In addition, when drilling and sampling, there is a risk of sample core breakage or incomplete sampling. The device can only remove the sample core with the short groove exposed at the lower end of the drill bit, and the broken part at the upper end still needs to be removed with the help of other tools, which has poor practicality. Summary of the invention

[0004] In order to solve the technical problem that when the above-mentioned concrete drilling machine device is drilling, the core body rigidity causes it to get stuck with the drill bit, and other tools are needed to remove the core body, and the structure of the sample core is easily damaged, resulting in incomplete sampling and affecting the detection test of the sample core, the present invention provides a sample core ejection type concrete drilling machine.

[0005] The technical solution of the present invention is as follows:

[0006] A core ejection type concrete drilling machine comprises a support module and an adjustment module thereon, a drilling sampling module and a core ejection module, wherein the support module supports and fixes the overall structure, the adjustment module is used to cooperate with and adjust the height of the drilling sampling module, and the drilling sampling module completes the drilling work, and after the drilling is completed, the core body can be taken out through the core ejection module, so that the drilling and removal of the core can be carried out more easily.

[0007] Specifically, the support module includes a base plate, and the drilling machine can be placed at the sampling position to be drilled through the base plate, the adjustment module includes an adjustment column vertically arranged above the base plate, the drilling sampling module includes a connecting block slidably arranged on the adjusting column, an adjusting member is also provided on one side of the connecting block, and the height of the connecting block can be adjusted by the adjusting member, and a drilling sampling device is also provided on one side of the connecting block, the drilling sampling device includes a shell connected to the connecting block, a drill bit is vertically and rotatably provided on the lower side of the shell, and a power device is also connected to the shell, the power device is connected to the drill bit through a transmission part and can drive the drill bit to rotate. As the main technical concept of the present invention, the drill bit is a hollow columnar structure that passes through from top to bottom, and the position where the drill bit is installed in the shell is in a vertical through state, that is, the drilling sampling device is in an unobstructed vertical through state along the axis of the drill bit at the position of the drill bit, and the sample core ejection module includes a connecting arm connected to the adjustment module and located above the shell, The connecting arm is connected to a vertically arranged push rod, the upper end of the push rod is connected to the connecting arm, and the lower end passes through the shell downward and extends into the drill bit. When drilling or sampling is performed, it is only necessary to place the drilling machine at the position to be drilled or sampled, and start the power device. The drilling sampling device is controlled to descend by the adjusting member to complete the drilling sampling work. After the sampling is completed, it is only necessary to control the drilling sampling device to rise by the adjusting member. The sample core inside the drill bit will be pushed out of the drill bit under the action of the push rod, and the sample core removal work is completed. No other device is required. The sample core can be removed only by the rise of the drilling sampling device, which makes the drilling sampling work more convenient. The push rod contacts the top of the sample core. When the sample core is removed, the integrity of the sample core can be better guaranteed, so that the sample core removal work is smoother. On the basis of the above, when the sample core is firmly connected with the inside of the drill bit, it is only necessary to repeatedly control the lifting and lowering of the drilling sampling device when the lower end of the push rod contacts the top of the sample core, so that the lower end of the push rod can completely remove the sample core by hitting it.

[0008] According to the above-mentioned core ejection type concrete drilling machine, the connecting arm is provided with a sliding hole matching the diameter of the push rod, the push rod is slidably arranged in the sliding hole and has a limit head on the upper end, a limit rod is inserted into the upper part of the push rod, the limit rod is located below the connecting arm and a compression spring is provided on the outer ring of the push rod between the limit rod and the connecting arm. On the one hand, such a setting method can prevent the push rod from being bent or damaged by the rigid impact force when the sample core is tightly connected to the drill bit and the sample core needs to be taken out with the help of the impact of the push rod. On the other hand, when the sample core still cannot be taken out by the impact force of the push rod, the drilling sampling device can be controlled to rise to lift the push rod upward, and the limit head of the push rod can be knocked with the help of other tools, so that the sample core can still be completely taken out when the connection is relatively firm.

[0009] It should be noted that in order to ensure that the lower end of the push rod can smoothly contact the sample core inside the drill bit and push the sample core out, the maximum length that the drill bit can extend from the bottom side of the bottom plate is greater than the minimum distance between the lower end of the push rod and the lower end of the drill bit.

[0010] As a preferred embodiment of the present invention, the minimum distance between the lower end of the push rod and the lower end of the drill bit is zero, so that when the push rod pushes out the sample core, the part of the sample core reserved in the drill bit can be completely pushed out by the push rod, and there is no need to manually remove the sample core, further ensuring the convenience of the drilling sampling work.

[0011] In the core ejection type concrete drilling machine as described above, the base plate includes a support plate and a connecting plate which are hingedly connected, the adjustment module is connected to the connecting plate, the support plate can be rotated to be perpendicular to the connecting plate and fixed to the adjustment module or the connecting arm by a fixing rod. In this state, the support plate is used as the base plate, the adjustment plate can be vertically set, and the drilling sampling work in the vertical plane can be completed, thereby expanding the application scope of the drilling machine.

[0012] Furthermore, a clamping rod is provided on one side of the upper end of the connecting plate close to the supporting plate for horizontal rotation, and at least one end of the clamping rod can be rotated to the lower side to contact the upper side of the supporting plate. In this state, the drilling and sampling work on the horizontal plane is completed, so that the connecting plate and the supporting plate can always be located in the same horizontal plane, preventing the connecting plate from tilting due to the downward tightening force of the drill bit during drilling sampling, thereby ensuring the verticality of the drill hole and the sample core.

[0013] In the core ejection concrete drilling machine as described above, the transmission part includes an axle, and the two ends of the axle are respectively connected to the power device and the drill bit through a bevel gear mechanism. The transmission work is completed by the bevel gear mechanism, making the transmission more stable and reliable.

[0014] Furthermore, the power device includes a motor, which is located on one side of the shell to prevent the rising height of the drilling sampling device from being limited by the relative positions of the connecting arm and the motor.

[0015] Furthermore, the bevel gear mechanism includes a first bevel gear connected to the motor drive shaft and a second bevel gear on the outer ring of the drill bit. A third bevel gear and a fourth bevel gear are respectively provided at both ends of the wheel shaft. The third bevel gear and the fourth bevel gear are respectively rollingly engaged with the first bevel gear and the second bevel gear.

[0016] Furthermore, the vertical projections of the adjusting module, the drilling sampling module and the core ejecting module are all located in the upper plane of the connecting plate, ensuring that the center of gravity of the adjusting module, the drilling sampling module and the core ejecting module falls on the connecting plate, thereby ensuring the stability of the drilling machine. A first opening is provided on the connecting plate below the drill bit, and the drill bit can pass through the first opening to complete the drilling sampling work.

[0017] The beneficial effects of the present invention are:

[0018] (1) The present invention is a core-ejecting concrete drilling machine. When drilling or sampling, it is only necessary to place the drill bit and the sampling device at the sampling position to be drilled, start the power device, and control the drilling sampling device to descend through the adjustment member to complete the drilling sampling work. After the sampling is completed, it is only necessary to control the drilling sampling device to rise through the adjustment member. The sample core inside the drill bit will be ejected from the drill bit under the action of the ejector rod, and the sample core removal work is completed. No other device is required. The sample core can be removed only by the rising of the drilling sampling device, making the drilling sampling work more convenient.

[0019] (2) The lower end of the push rod is in contact with the top of the sample core, which can better ensure the integrity of the sample core when the sample core is removed, making the sample core removal work smoother. When the sample core is firmly connected to the inside of the drill bit, it is only necessary to repeatedly control the lifting and lowering of the drilling sampling device when the lower end of the push rod is in contact with the top of the sample core, so that the lower end of the push rod can hit the sample core to remove it completely. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] By reading the detailed description of the preferred embodiment below, the scheme and advantages of the present application will become clear to those skilled in the art. The accompanying drawings are only for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention.

[0021] In the attached picture:

[0022] Figure 1 It is a structural schematic diagram of a drilling machine in an embodiment;

[0023] Figure 2 for Figure 1 The main view;

[0024] Figure 3 It is a schematic diagram of the state of the drilling machine in the embodiment when performing vertical plane drilling sampling work;

[0025] Figure 4 Schematic diagram of the connection structure between the adjustment module and the connecting arm in the embodiment;

[0026] Figure 5 It is a structural schematic diagram of a drilling sampling module in an embodiment;

[0027] Figure 6 Schematic diagram of the internal structure of the housing in the embodiment;

[0028] Figure 7 Schematic diagram of the connection structure between the connecting arm and the top rod in the embodiment;

[0029] Figure 8 for Figure 7 Cross-sectional view (connection location);

[0030] The components represented by the reference numerals in the figure are:

[0031] 1. Support module; 11. Support plate; 12. Connecting plate; 121. First opening; 13. Fixing rod; 14. Pressing rod; 2. Adjusting module; 21. Adjusting column; 22. Connecting column; 3. Drilling sampling module; 31. Adjusting device; 311. Connecting block; 312. Rotating driving disk; 3121. Rotating arm; 32. Drilling sampling device; 321. Shell; 3211. Second opening; 322. Motor; 3221. First bevel gear; 323. Drill bit; 3231. Second bevel gear; 324. Transmission unit; 3241. Third bevel gear; 3242. Fourth bevel gear; 4. Sample core ejecting module; 41. Connecting arm; 411. Sliding hole; 42. Ejecting device; 421. Ejector rod; 422. Compression spring; 423. Limiting rod. DETAILED DESCRIPTION

[0032] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0033] Example

[0034] This embodiment provides a core ejection type concrete drilling machine, see Figure 1 , including a supporting module 1 and an adjusting module 2 above it, a drilling sampling module 3 and a core ejecting module 4, wherein the supporting module 1 supports and fixes the overall structure, the adjusting module 2 is used to cooperate in adjusting the height of the drilling sampling module 3, and the drilling sampling module 3 completes the drilling sampling work, and after the drilling is completed, the core body can be taken out through the core ejecting module 4, so that the drilling and taking out of the core can be carried out more easily.

[0035] In this embodiment, combined with Figure 2 and Figure 3The support module 1 includes a horizontally arranged bottom plate, and the drilling machine can be placed at the position to be drilled and sampled through the bottom plate. The adjustment module 2 includes an adjustment column 21 vertically arranged above the bottom plate. The drilling sampling module 3 includes an adjustment device 31 and a drilling sampling device 32 located on one side thereof. The adjustment device 31 is vertically slidably connected to the adjustment column 21, and the adjustment device 31 can drive the drilling sampling device 32 to move up and down to complete the drilling sampling work.

[0036] Specifically, the adjusting column 21 includes a vertically arranged rectangular parallelepiped structure, a guide groove is vertically arranged on the front side of the adjusting column 21, and a rack is arranged on one side of the guide groove. The adjusting device 31 includes a connecting block 311, and the connecting block 311 is vertically slidably connected with the adjusting column 21 in a sleeve manner. The adjusting device 31 also includes an adjusting member located at the front side of the connecting block 311, and the height of the connecting block 311 can be adjusted by the adjusting device 31. In this embodiment, the adjusting member is a rotating driving disk 312, and the central axis of the rotating driving disk 312 is rotatably connected to the connecting block 311 and passes through the connecting block 311 to extend into the guide groove. A spur gear matching with the rack is arranged at one end of the central axis located in the guide groove. By rotating the rotating driving disk 312, the connecting block 311 can be driven to move up and down under the cooperation of the spur gear and the rack. The drilling sampling device 32 is arranged on one side of the connecting block 311, and the drilling sampling work is completed by the up and down movement of the connecting block 311.

[0037] Furthermore, the rotating drive disk 312 includes a rotating arm 3121 located on the front outer ring thereof, and the rotating arm 3121 can make the rotating drive of the rotating drive disk 312 easier.

[0038] Further, combined with Figure 4 and Figure 6 The drilling sampling device 32 includes a shell 321 located on one side of the connecting block 311 and connected to the connecting block 311. A drill bit 323 is vertically and rotatably provided on the lower side of the shell 321. A power device is also connected to the one side. The power device is connected to the drill bit 323 through a transmission part 324 and can drive the drill bit 323 to rotate, and under the action of the rotating drive disk 312, the drill bit 323 of the drilling sampling device 32 is driven to rise and fall vertically to complete the drilling sampling work.

[0039] In this embodiment, combined with Figure 6The shell 321 includes a hollow rectangular structure, one end of which is connected to the connecting block 311. The drill bit 323 is vertically rotatably arranged on the lower side of the shell 321 away from the end of the connecting block 311, and the upper end of the drill bit 323 extends into the shell 321. The power device is a motor 322 arranged on one side of the shell 321, and the transmission shaft of the motor 322 extends into the shell 321. The transmission part 324 includes a wheel axle located inside the shell 321, and the two ends of the wheel axle are respectively connected to the motor 322 and the drill bit 323 through a bevel gear mechanism. The transmission work is completed by the bevel gear mechanism, making the transmission more stable and reliable.

[0040] Specifically, the bevel gear mechanism includes a first bevel gear 3221 connected to the transmission shaft of the motor 322, and a second bevel gear 3231 is provided on the outer ring of one end of the drill bit 323 located in the housing 321. The wheel axle is horizontally arranged and a third bevel gear 3241 and a fourth bevel gear 3242 are respectively provided at both ends. The third bevel gear 3241 and the fourth bevel gear 3242 are respectively rollingly engaged with the first bevel gear 3221 and the second bevel gear 3231, and the first bevel gear 3221 is driven to rotate by the motor 322. The third bevel gear 3241 rotates under the action of the first bevel gear 3221 and then drives the fourth bevel gear 3242 to rotate, and the drill bit 323 is driven to rotate through the rotation of the fourth bevel gear 3242 to complete the drilling sampling work.

[0041] As the main technical concept of the present invention, combined with Figure 5 , Figure 7 and Figure 8The drill bit 323 is a hollow columnar structure that penetrates from top to bottom. The position of the housing 321 where the drill bit 323 is installed is in a vertical penetration state, that is, the upper side of the housing 321 is provided with a second opening 3211 coaxial with the drill bit 323 at the position of the drill bit 323, so that the drilling sampling device 32 is in a vertical penetration state without obstruction along the axis of the drill bit 323 at the position of the drill bit 323. The sample core ejection module 4 includes a connecting arm 41 and an ejection device 42 at one end of the connecting arm 41. The ejection device 42 includes a push rod 421 vertically arranged with the connecting arm 41, and the adjusting module 2 also includes a connecting column 22 vertically arranged at the upper end of the adjusting column 21. The end of the connecting arm 41 away from the push rod 421 is connected to the top of the connecting column 22, and the connecting arm 41 is located above the shell 321 as a whole. The upper end of the push rod 421 is connected to the connecting arm 41, and the lower end passes downward through the second opening 3211 of the shell 321 and extends from the upper end of the drill bit 323 into the inside of the drill bit 323. When When drilling or sampling, it is only necessary to place the drilling machine at the position to be drilled or sampled, start the power device, control the drilling sampling device 32 to descend by rotating the driving disk 312, and complete the drilling sampling work through the drill bit 323. After the sampling is completed, it is only necessary to control the drilling sampling device 32 to rise by rotating the driving disk 312 again. The sample core inside the drill bit 323 will be pushed out of the drill bit 323 under the action of the push rod 421, and the sample core removal work is completed. No other device is required, and only the drilling sampling device is used. The rise of the device 32 can complete the removal of the sample core, making the drilling sampling work more convenient. The push rod 421 contacts the top of the sample core. When the sample core is removed, the integrity of the sample core can be better guaranteed, making the sample core removal work smoother. On the basis of the above, when the sample core is firmly connected with the inside of the drill bit 323, it is only necessary to repeatedly control the lifting and lowering of the drilling sampling device 32 when the lower end of the push rod 421 contacts the top of the sample core, so that the lower end of the push rod 421 can completely remove the sample core by hitting it.

[0042] As a preferred embodiment, a sliding hole 411 matching the diameter of the ejector rod 421 is vertically provided on one end of the connecting arm 41 away from the connecting column 22, the ejector rod 421 is slidably arranged in the sliding hole 411 and a limiting head is provided at the upper end, the ejection device 42 also includes a compression spring 422 and a limiting rod 423, a through hole is transversely provided on the upper part of the ejector rod 421 and the limiting rod 423 is inserted into the through hole, the limiting rod 423 is located below the connecting arm 41, the compression spring 422 is located between the connecting arm 41 and the limiting rod 423 and is sleeved on the outer ring of the ejector rod 421, and the two ends of the compression spring 422 are respectively connected to the sliding hole 411. The lower outer ring 11 is in contact with the limiting rod 423, and the limiting head presses the upper end of the slide hole 411 under the action of the compression spring 422. On the one hand, such a setting can prevent the push rod 421 from being bent or damaged by the rigid impact force when the sample core is tightly connected with the drill bit 323 and the sample core needs to be taken out by the impact of the push rod 421. On the other hand, when the sample core still cannot be taken out by the impact force of the push rod 421, the drilling sampling device 32 can be controlled to rise to lift the push rod 421 upward, and the limiting head of the push rod 421 can be knocked with the help of other tools, so that the sample core can still be completely taken out when the connection is relatively firm.

[0043] Furthermore, the motor 322 is located at the rear side of the housing 321 to prevent the rising height of the drilling sampling device 32 from being limited by the relative positions of the connecting arm 41 and the motor 322 .

[0044] It should be noted that, in order to ensure that the lower end of the push rod 421 can smoothly contact the sample core inside the drill bit 323 and push out the sample core, the maximum length that the drill bit 323 can extend out of the lower side of the bottom plate is greater than the minimum distance between the lower end of the push rod 421 and the lower end of the drill bit 323. At the same time, the minimum distance between the lower end of the push rod 421 and the lower end of the drill bit 323 is zero, so that when the push rod 421 pushes out the sample core, the part of the sample core reserved in the drill bit 323 can be completely pushed out by the push rod 421, and there is no need to manually remove the sample core, which further ensures the convenience of the drilling sampling work.

[0045] In this embodiment, combined with Figure 3The bottom plate includes a support plate 11 and a connecting plate 12 which are hingedly connected. The connecting plate 12 and the support plate 11 are both horizontally arranged and connected by hinges. The adjusting column 21 is located on one side of the middle part of the connecting plate 12 close to the adjusting plate. The support plate 11 can be rotated upward to be perpendicular to the connecting plate 12 and is fixed to the adjusting module 2 or the connecting arm 41 through a fixing member. Specifically, a first connecting seat is provided on the side of the support plate 11 away from the connecting plate 12, and the fixing member is a fixing column, one end of which is rotatably connected to the first connecting seat. The connecting arm 41 is provided with a second connecting seat at one end away from the top rod 421, and when the support plate 11 is rotated upward to be perpendicular to the connecting plate 12, the end of the fixing column away from the first connecting seat can be fixed to the second connecting seat by a latch. In this state, with the support plate 11 as the bottom plate, that is, after the support plate 11 is fixed, when the adjusting plate is vertically arranged, the drilling sampling work in the vertical plane can be completed, thereby expanding the scope of application of the drilling machine.

[0046] Furthermore, a clamping rod 14 is horizontally rotatably provided on one side of the upper end of the connecting plate 12 close to the support plate 11, and at least one end of the clamping rod 14 can be rotated to the lower side to contact the upper side of the support plate 11, that is, when the support plate 11 and the connecting plate 12 are in the same horizontal plane, the support plate 11 can be clamped by rotating the clamping rod 14 to prevent it from rotating relative to the connecting plate 12. In this state, the drilling and sampling work on the horizontal plane is completed, so that the connecting plate 12 and the support plate 11 can always be located in the same horizontal plane, preventing the connecting plate 12 from tilting due to the downward tightening force of the drill bit 323 during drilling sampling, thereby ensuring the verticality of the drilling and sample core.

[0047] Furthermore, to ensure the stability of the drilling machine, the vertical projections of the adjusting module 2, the drilling sampling module 3 and the core ejecting module 4 are all located in the upper plane of the connecting plate 12, so that the center of gravity of the adjusting module 2, the drilling sampling module 3 and the core ejecting module 4 falls on the connecting plate 12, and a first opening 121 is provided on the connecting plate 12 below the drill bit 323, and the drill bit 323 can pass through the first opening 121 to complete the drilling sampling work.

Claims

1. A core ejection concrete drilling machine, characterized in that: It comprises a supporting module (1), an adjusting module (2), a drilling sampling module (3) and a sample core ejecting module (4); The support module (1) comprises a bottom plate, and the adjustment module (2) comprises an adjustment column (21) vertically arranged above the bottom plate; The drilling sampling module (3) comprises a connecting block (311) slidably arranged on the adjusting column (21), and a drilling sampling device (32) arranged on one side of the connecting block (311), the drilling sampling device (32) comprising a shell (321) connected to the connecting block (311), and a drill bit (323) vertically and rotatably arranged at the lower side of the shell (321), the shell (321) is also connected to a power device, the power device is transmission-connected to the drill bit (323) through a transmission part (324) and can drive the drill bit (323) to rotate, the drill bit (323) is a hollow columnar structure that is through-through from top to bottom, and the position of the shell (321) where the drill bit (323) is installed is in a vertical through-state; The sample core ejection module (4) comprises a connecting arm (41) connected to the adjustment module (2) and located above the housing (321); a vertically arranged ejector rod (421) is connected to the connecting arm (41); the upper end of the ejector rod (421) is connected to the connecting arm (41), and the lower end of the ejector rod (421) passes downward through the housing (321) and extends into the interior of the drill bit (323); The connecting arm (41) is provided with a sliding hole (411) matching the diameter of the push rod (421); the push rod (421) is slidably arranged in the sliding hole (411) and is provided with a limit head at the upper end; a limit rod (423) is also inserted into the upper part of the push rod (421); the limit rod (423) is located below the connecting arm (41) and a compression spring (422) is provided on the outer ring of the push rod (421) between the limit rod (423) and the connecting arm (41).

2. The core ejection type concrete drilling machine according to claim 1, characterized in that: The maximum length that the drill bit (323) can extend out of the lower side of the bottom plate is greater than the minimum distance between the lower end of the push rod (421) and the lower end of the drill bit (323).

3. The core ejection concrete drilling machine according to claim 2, characterized in that: The minimum distance between the lower end of the push rod (421) and the lower end of the drill bit (323) is zero.

4. A core ejection type concrete drilling machine according to any one of claims 1 to 3, characterized in that: The base plate comprises a support plate (11) and a connecting plate (12) which are hingedly connected, the adjustment module (2) is connected to the connecting plate (12), and the support plate (11) can be rotated to be perpendicular to the connecting plate (12) and fixed to the adjustment module (2) or the connecting arm (41) via a fixing rod (13).

5. The core ejection type concrete drilling machine according to claim 4, characterized in that: A clamping rod (14) is horizontally rotatably provided on one side of the upper end of the connecting plate (12) close to the supporting plate (11), and at least one end of the clamping rod (14) can be rotated to the lower side to contact the upper side of the supporting plate (11).

6. A core ejection type concrete drilling machine according to any one of claims 1 to 3, characterized in that: The transmission part (324) comprises a wheel axle, and two ends of the wheel axle are respectively connected to the power device and the drill bit (323) through a bevel gear mechanism.

7. The core ejection type concrete drilling machine according to claim 6, characterized in that: The power device comprises a motor (322) which is located on one side of the housing (321).

8. The core ejection type concrete drilling machine according to claim 7, characterized in that: The bevel gear mechanism comprises a first bevel gear (3221) connected to the transmission shaft of the motor (322), and a second bevel gear (3231) on the outer ring of the drill bit (323); a third bevel gear (3241) and a fourth bevel gear (3242) are respectively provided at both ends of the wheel shaft; the third bevel gear (3241) and the fourth bevel gear (3242) are respectively in rolling engagement with the first bevel gear (3221) and the second bevel gear (3231).

9. The core ejection type concrete drilling machine according to claim 4, characterized in that: The vertical projections of the adjustment module (2), the drilling sampling module (3) and the sample core ejection module (4) are all located in the upper plane of the connecting plate (12), and a first opening (121) is provided on the connecting plate (12) below the drill bit (323).

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