Hollow screw drill

Abstract

The invention provides a hollow screw drill which is provided with a through mounting channel, the mounting channel is used for allowing a screen pipe to penetrate through, and the hollow screw drill comprises a drill bit and a screw rod, the screw motor is provided with a rotor pipe and a stator pipe, the stator pipe is arranged on the outer side of the rotor pipe in a sleeving mode, an inner cavity of the rotor pipe is located on the mounting channel, a gas channel is formed between the stator pipe and the rotor pipe, a threaded structure is arranged on the outer wall of the stator pipe, the screw motor is provided with an input end and a connecting end which are oppositely arranged, and the connecting end is in driving connection with the drill bit. The gas channel is connected with gas conveying equipment through an input end; the end cover is arranged at a port, close to one side of the input end, of the rotor pipe, the end cover is provided with a plugging plate, the plugging plate has a plugging state and a crushing state which are oppositely arranged, and when the plugging plate is in the crushing state, the screen pipe can enter an inner cavity of the rotor pipe. By means of the technical scheme, the problem that in the prior art, after a directional drilling tool is lifted out, drilling holes are prone to being blocked, and the whole-hole-section screen pipe cannot be efficiently put down can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of underground coal mine drilling, in particular to a hollow screw drill. Background Art

[0002] At present, when coal mining is carried out, broken and soft coal seams often exist in the mining area. Broken and soft coal seams generally have the characteristics of complex structural stress, high gas pressure, low permeability and coal body fragmentation. During the construction of gas extraction drilling, hole collapse, blowout and hole wall instability are prone to occur, resulting in shallow hole depth and possible borehole blockage, which affects the gas control effect.

[0003] In the prior art, a screw drill using air, nitrogen or other gases as a power medium is used to perform gas extraction drilling. After the drilling is completed, the drill is lifted and a screen is placed in the screw hole. Alternatively, the screen is not placed first and a hole sweeping drill is used to sweep the hole before the screen is placed. The screen plays a supporting role in the borehole before gas extraction is performed to ensure the stability of the borehole during gas extraction. However, since the local hole section of the drill hole in the broken soft coal seam is prone to collapse, the depth of the screen cannot be guaranteed, which affects the gas extraction effect. In addition, new holes are easily drilled during the hole sweeping process, resulting in the screen placed through the inner hole of the hole sweeping drill not being placed in the original borehole, thereby affecting the gas extraction effect. At the same time, placing the screen after lifting the drill increases the labor intensity of the workers and reduces the construction efficiency. On the other hand, the construction site needs to be equipped with a cable drill for directional drilling with measurement while drilling and a hole sweeping drill for placing the screen, which increases the cost of purchasing coal mine materials and the site space for storing drill tools. Summary of the invention

[0004] The invention provides a hollow screw drill to solve the problem that after the directional drilling drill in the prior art is raised, the borehole is easily blocked and a screen pipe cannot be efficiently lowered into the entire hole section.

[0005] The present invention provides a hollow screw drill, the hollow screw drill has a penetrating installation channel, the installation channel is used to penetrate a screen tube, the hollow screw drill comprises: a drill bit; a screw motor, having a rotor tube and a stator tube, the stator tube is sleeved on the outside of the rotor tube, the inner cavity of the rotor tube is located on the installation channel, a gas channel is provided between the stator tube and the rotor tube, a threaded structure is provided on the outer wall of the stator tube, the screw motor has an input end and a connecting end which are relatively arranged, the connecting end is connected to the drill bit driving, and the gas channel is connected to a gas conveying device through the input end; an end cover is arranged at a port of the rotor tube close to the input end, the end cover has a blocking plate, the blocking plate has a blocking state and a crushing state which are relatively arranged, when the blocking plate is in the blocking state, the blocking plate blocks the installation channel, and gas can enter the gas channel; when the blocking plate is in the crushing state, the screen tube can enter the inner cavity of the rotor tube.

[0006] Furthermore, the end cover also includes a connecting pipe, which is connected to the rotor tube. The sealing plate is fixedly arranged in the connecting pipe. The connecting pipe has a guide section, which is located on the side of the sealing plate away from the rotor tube. The inner diameter of the guide section gradually decreases in the direction away from the rotor tube.

[0007] Furthermore, a plurality of air guide holes are arranged at annular intervals on the side wall of the guide section.

[0008] Furthermore, the connecting pipe also includes a connecting section, one end of which is fixedly connected to the rotor tube, and the other end of which is fixedly connected to the guide section. The inner wall of the guide section has an annular slot, and the connecting section has a connecting boss, which is inserted into the slot. There is a gap between the connecting boss and the bottom of the slot, and the sealing plate is detachably arranged in the gap.

[0009] Furthermore, the blocking plate is made of glass.

[0010] Furthermore, the drill bit has a drill bit cavity, which is located on the installation channel. The drill bit is provided with blade wings, which are hinged on the side walls of the drill bit to block or open the installation channel.

[0011] Furthermore, the hollow screw drill also includes a measuring rod, which is detachably connected to the screw motor, and has a first inner tube and a first outer tube. The first inner tube is inserted into the first outer tube, and the inner cavity of the first inner tube is located on the installation channel. A sensor is arranged on the outer wall of the first inner tube, and the sensor is used to obtain the working status of the hollow screw drill during drilling.

[0012] Furthermore, the hollow screw drilling tool also includes an extension rod, which is arranged at the end of the measuring rod away from the screw motor. The extension rod has a second inner tube and a second outer tube. The second inner tube is inserted into the second outer tube, and the inner cavity of the second inner tube is located on the installation channel. The first inner tube and the second outer tube are detachably connected, and an electrical connection structure is arranged between the first inner tube and the second outer tube. The sensor is electrically connected to the electrical connection structure. A signal line is arranged between the second inner tube and the second outer tube, and the signal line is electrically connected to the electrical connection structure. The signal line is used to transmit the signal acquired by the sensor.

[0013] Further, the first inner tube is inserted into the second outer tube, the inner wall of the second outer tube is provided with a conductive ring, the conductive ring is electrically connected to the signal line, the outer wall of the first inner tube is provided with a first conductive seat, the first conductive seat and the conductive ring cooperate to form an electrical connection structure, the first conductive seat includes a first rubber ring and a plurality of first ring petals, the first rubber ring is annularly arranged on the outer wall of the first inner tube, the plurality of first ring petals are annularly arranged on the first rubber ring at intervals, and the first ring petals protrude from the circumferential side of the first rubber ring, and the first ring petals are electrically connected to the sensor.

[0014] Furthermore, a plurality of extension rods are provided, and the plurality of extension rods are connected in sequence. A second conductive seat is provided at the first end of the second inner tube away from the conductive ring. The second conductive seat includes a second rubber ring and a plurality of second ring petals. The second rubber ring is arranged in an annular manner on the outer wall of the second inner tube. The plurality of second ring petals are arranged in an annular manner at intervals on the second rubber ring, and the second ring petals protrude from the circumferential side of the second rubber ring. The second ring petals are electrically connected to the conductive ring through a signal line, and two adjacent extension rods are electrically connected to the second conductive seat through the conductive ring.

[0015] By applying the technical solution of the present invention, the hollow screw drill can drive the drill bit to rotate through the screw motor, and then drill holes in the coal wall. When the drilling construction is completed, the screen tube can be sent into the coal wall through the installation channel of the hollow screw drill. When the screen tube reaches the installation position, the hollow screw drill is lifted out of the borehole to complete the installation of the screen tube. In the above process, the hollow screw drill itself forms a protective tube for the screen tube to prevent the collapse of the borehole when the screen tube moves in the borehole. The installation channel guides the formation of the screen tube, and there is no need to use a hole sweeping drill to clean the borehole, preventing new holes from being drilled during the hole sweeping process, ensuring that the screen tube can be installed in place, and reducing equipment requirements; at the same time, the hollow screw drill of the present application does not need to completely lift the screw motor and the drill bit out of the borehole before inserting the screen tube, which reduces the labor intensity of the workers and ensures the construction efficiency of the drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 The schematic diagram of the structure of the hollow screw drill provided by the present invention during drilling operation is shown;

[0018] Figure 2 The schematic diagram of the structure of the hollow screw drill provided by the present invention when it is lowered into the screen pipe is shown;

[0019] Figure 3 The structural schematic diagram of the screw motor provided by the present invention is shown;

[0020] Figure 4 The schematic diagram of the structure of the end cover provided by the present invention is shown;

[0021] Figure 5 A schematic structural diagram of a drill bit provided by the present invention is shown;

[0022] Figure 6 A schematic structural diagram of a measuring rod provided by the present invention is shown;

[0023] Figure 7A schematic structural diagram of a first conductive seat provided by the present invention is shown;

[0024] Figure 8 The figure shows a schematic structural diagram of the extension rod provided by the present invention.

[0025] The above drawings include the following reference numerals:

[0026] 01. Screen tube; 02. Gas transmission equipment; 03. Data analysis equipment;

[0027] 100, drill bit; 110, drill bit cavity; 120, blade;

[0028] 200, screw motor; 210, rotor tube; 220, stator tube; 230, end cover; 231, blocking plate; 232, connecting tube; 2321, guide section; 2322, connecting section; 233, air guide hole; 240, universal shaft; 250, connecting shaft;

[0029] 300, measuring rod; 310, first inner tube; 311, first conductive seat; 3111, first rubber ring; 3112, first ring petal; 312, connecting wire; 320, first outer tube;

[0030] 400, extension rod; 410, second inner tube; 420, second outer tube; 421, conductive ring; 422, second conductive seat; 430, signal line. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figures 1 to 4As shown, an embodiment of the present invention provides a hollow screw drill, the hollow screw drill has a through installation channel, the installation channel is used to penetrate the screen pipe 01, and the hollow screw drill includes a drill bit 100 and a screw motor 200. Among them, the screw motor 200 has a rotor tube 210 and a stator tube 220, the stator tube 220 is sleeved on the outside of the rotor tube 210, the inner cavity of the rotor tube 210 is located on the installation channel, and there is a gas channel between the stator tube 220 and the rotor tube 210, and a threaded structure is provided on the outer wall of the stator tube 220. The screw motor 200 has an input end and a connecting end that are relatively arranged, the connecting end is connected to the drill bit 100 for driving, and the gas channel is connected to the gas conveying device 02 through the input end. An end cover 230 is provided at the port of the rotor tube 210 close to the input end. The end cover 230 has a sealing plate 231. The sealing plate 231 has a relatively set sealing state and a broken state. When the sealing plate 231 is in the sealing state, the sealing plate 231 blocks the installation channel, and the gas can enter the gas channel; when the sealing plate 231 is in the broken state, the screen tube 01 can enter the inner cavity of the rotor tube 210.

[0033] By applying the technical solution of the present invention, the hollow screw drill can drive the drill bit to rotate through the screw motor 200, and then drill holes in the coal wall. When the drilling construction is completed, the screen tube 01 can be sent into the coal wall through the installation channel of the hollow screw drill. When the screen tube 01 reaches the installation position, the hollow screw drill is pulled out of the borehole to complete the installation of the screen tube 01. In the above process, the hollow screw drill itself forms a protective tube for the screen tube 01 to prevent the collapse of the borehole when the screen tube 01 moves in the borehole. The installation channel guides the formation of the screen tube 01. There is no need to use a hole sweeping drill to clean the borehole, prevent new holes from being drilled during the hole sweeping process, ensure that the screen tube 01 can be installed in place, and reduce equipment requirements; at the same time, the hollow screw drill of the present application does not need to completely pull the screw motor 200 and the drill bit 100 out of the borehole before inserting the screen tube 01, which reduces the labor intensity of the workers and ensures the construction efficiency of the drilling.

[0034] Specifically, refer to Figure 3As shown, similar to a liquid-driven screw drill, a threaded drive structure is provided on the outer wall of the rotor tube 210 of the screw motor 200 provided in the present application. When the sealing plate 231 is in a sealed state, the airflow will not enter the inner cavity of the rotor tube 210, that is, it will not flow out through the installation channel, but enter the gas channel through the port at the connecting end. The gas cooperates with the threaded drive structure to drive the rotor tube 210 to rotate, thereby driving the drill bit 100 to rotate. After the drill bit 100 completes drilling, the gas delivery is stopped, and the screen tube 01 is lowered into the installation channel. When the screen tube 01 reaches the position of the sealing plate 231, an impact force can be applied to the screen tube 01 to break the sealing plate 231, so that the installation channel is connected, and the screen tube 01 can pass through the inner cavity of the rotor tube 210, and then drill out from the drill bit 100 to complete the installation of the screen tube 01.

[0035] like Figure 4 As shown, the end cover 230 further includes a connecting pipe 232, which is connected to the rotor tube 210, and the blocking plate 231 is fixedly arranged in the connecting pipe 232. The connecting pipe 232 has a guide section 2321, which is located on the side of the blocking plate 231 away from the rotor tube 210, and the inner diameter of the guide section 2321 gradually decreases in the direction away from the rotor tube 210. Through the above arrangement, the guide section 2321 of the end cover 230 can guide the movement of the screen tube 01, ensuring that the screen tube 01 can align with the blocking plate 231 when it moves to the position of the blocking plate 231.

[0036] When the gas reaches the position of the sealing plate 231, the airflow will be stopped by the sealing plate 231 and will generate vortices due to the action of the guide section 2321, thereby affecting the efficiency of the airflow and further affecting the rotation effect of the screw motor 200. In the present application, a plurality of air guide holes 233 are arranged at annular intervals on the side wall of the guide section 2321. The plurality of air guide holes 233 can enable the airflow to flow directly out of the guide section 2321 to ensure the circulation efficiency of the gas.

[0037] Furthermore, the connecting pipe 232 also includes a connecting section 2322, one end of which is fixedly connected to the rotor tube 210, and the other end of which is fixedly connected to the guide section 2321. The inner wall of the guide section 2321 has an annular slot, and the connecting section 2322 has a connecting boss, which is inserted into the slot, and there is a gap between the end surface of the connecting boss facing one end of the slot and the bottom of the slot, and the blocking plate 231 is detachably arranged in the gap. Through the above arrangement, the broken blocking plate 231 can be easily replaced, the end cover 230 can be reused, and the construction cost can be reduced.

[0038] Specifically, the slot and the connecting boss may be connected via threads.

[0039] Specifically, a sealant such as glass glue may be applied around the sealing plate 231 to ensure the sealing performance at the sealing plate 231 .

[0040] In one embodiment of the present application, the blocking plate 231 is made of glass. This arrangement makes it easy to observe the situation inside the installation channel. The glass material has a certain structural strength and is also easy to break when subjected to a certain impact force, so that the blocking plate 231 can be broken by the impact of the screen tube 01.

[0041] Specifically, a conical impact head may be provided at the end of the screen pipe 01 to facilitate the screen pipe 01 to break the blocking plate 231 .

[0042] Furthermore, a connecting shaft 250 is provided at the connecting end of the rotor tube 210, and the connecting shaft 250 is used to fix the drill bit 100. A universal shaft 240 is also connected between the connecting shaft 250 and the rotor tube 210 to improve the performance of the hollow screw drilling tool. The connecting shaft 250 and the universal shaft 240 are both hollow structures.

[0043] like Figure 5 As shown, the drill bit 100 has a drill bit cavity 110, and the drill bit cavity 110 is located on the installation channel. The drill bit 100 is provided with a blade wing 120, and the blade wing 120 is hinged on the side wall of the drill bit 100 to block or open the installation channel. Through the above arrangement, when the drill bit 100 is in a rotating working state, the blade wing 120 can block the installation channel to prevent debris and other debris from entering; when the screen pipe is lowered, the blade wing 120 can be opened to open the installation channel so that the screen pipe 01 can pass through smoothly.

[0044] Specifically, the blade 120 may be driven by hydraulic pressure or by an electric motor.

[0045] like Figure 6 As shown, the hollow screw drilling tool also includes a measuring rod 300, which is detachably connected to the screw motor 200. The measuring rod 300 has a first inner tube 310 and a first outer tube 320. The first inner tube 310 is inserted into the first outer tube 320. The inner cavity of the first inner tube 310 is located on the installation channel. A sensor is arranged on the outer wall of the first inner tube 310. The sensor is used to obtain the working status of the hollow screw drilling tool during drilling. The sensor may include a transmission module, a temperature sensor module, an acceleration sensor module, a magnetic sensor module, a formation identification module and a microcontroller module, etc., to obtain the current working status of the drilling, so as to judge the progress of the current drilling work. Specifically, two seismic isolation rings may be respectively arranged at both ends of the multiple sensor modules along the axial direction of the measuring rod 300 to reduce the influence of vibration on the sensor identification accuracy.

[0046] like Figure 7 and Figure 8The hollow screw drill also includes an extension rod 400, which is arranged at one end of the measuring rod 300 away from the screw motor 200. The extension rod 400 has a second inner tube 410 and a second outer tube 420. The second inner tube 410 is inserted into the second outer tube 420, and the inner cavity of the second inner tube 410 is located on the installation channel. The first inner tube 310 and the second outer tube 420 are detachably connected. An electrical connection structure is arranged between the first inner tube 310 and the second outer tube 420, and the sensor is electrically connected to the electrical connection structure. A signal line 430 is arranged between the second inner tube 410 and the second outer tube 420, and the signal line 430 is electrically connected to the electrical connection structure. The signal line 430 is used to transmit the signal obtained by the sensor. A connecting line 312 can also be arranged between the first inner tube 310 and the first outer tube 320, and the connecting line 312 is respectively connected to the electrical connection structure and the sensor to realize signal transmission. The extension rod 400 can extend the length of the hollow screw drill, and the signal line 430 in the extension rod 400 can realize signal transmission in the hole, and the stability of signal transmission is ensured through wired connection.

[0047] Specifically, a threaded connection structure is provided on the inner wall of the first outer tube 320 and the outer wall of the second outer tube 420, and the first outer tube 320 and the second outer tube 420 are connected by the threaded connection structure. The first inner tube 310 is inserted into the second outer tube 420, and a conductive ring 421 is provided on the inner wall of the second outer tube 420, and the conductive ring 421 is electrically connected to the signal line 430. A first conductive seat 311 is provided on the outer wall of the first inner tube 310, and the first conductive seat 311 cooperates with the conductive ring 421 to form an electrical connection structure. The first conductive seat 311 includes a first rubber ring 3111 and a plurality of first ring petals 3112. The first rubber ring 3111 is annularly arranged on the outer wall of the first inner tube 310, and the plurality of first ring petals 3112 are annularly arranged on the first rubber ring 3111 at intervals, and the first ring petals 3112 protrude from the circumferential side of the first rubber ring 3111, and the first ring petals 3112 are electrically connected to the sensor. Through the above arrangement, the first ring petal 3112 and the conductive ring 421 can be electrically connected to realize data transmission. The first rubber ring 3111 can provide radial elastic force for the first ring petal 3112. At the same time, the first ring petal 3112 protrudes from the circumferential side of the first rubber ring 3111, which can ensure the stability of the connection between the first ring petal 3112 and the conductive ring 421.

[0048] Specifically, the conductive ring 421 may be a copper ring.

[0049] In the present application, a plurality of extension rods 400 are provided, and the plurality of extension rods 400 are connected in sequence. A second conductive seat 422 is provided at the first end of the second inner tube 410 away from the conductive ring 421. The second conductive seat 422 has a similar structure to the first conductive seat 311, including a second rubber ring and a plurality of second ring petals. The second rubber ring is annularly arranged on the outer wall of the second inner tube 410. The plurality of second ring petals are annularly arranged at intervals on the second rubber ring, and the second ring petals protrude from the circumferential side of the second rubber ring. The second ring petals are electrically connected to the conductive ring 421 through a signal line 430, and two adjacent extension rods 400 are electrically connected to the second conductive seat 422 through the conductive ring 421. Through the above arrangement, the signal line 430 between two adjacent extension rods 400 can be connected to the conductive ring 421 through the second conductive seat 422. When the extension rod 400 extends the drilling depth, the length of the signal line 430 is extended, so that the signal line 430 can be connected to the data analysis device 03 to analyze the current drilling state of the hollow screw drilling tool.

[0050] Furthermore, a non-magnetic rod can be arranged between the extension rod 400 and the measuring rod 300, and between the measuring rod 300 and the screw motor 200 to reduce the signal shielding of the sensor in the measuring rod 300 by the magnetic field. A cable is also arranged in the non-magnetic rod between the extension rod 400 and the measuring rod 300 to realize the electrical connection between the extension rod 400 and the measuring rod 300. The structure of the non-magnetic rod is the same as that of the extension rod 400, and the only difference is that the non-magnetic rod is made of non-magnetic material.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0052] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0053] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0054] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0055] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hollow screw drill, characterized in that: The hollow screw drill has a penetrating installation channel, and the installation channel is used to penetrate the screen tube (01). The hollow screw drill comprises: Drill bit (100); A screw motor (200) comprises a rotor tube (210) and a stator tube (220), wherein the stator tube (220) is sleeved on the outer side of the rotor tube (210), the inner cavity of the rotor tube (210) is located on the installation channel, a gas channel is provided between the stator tube (220) and the rotor tube (210), a threaded structure is provided on the outer wall of the stator tube (220), the screw motor (200) comprises an input end and a connecting end which are arranged opposite to each other, the connecting end is drivingly connected to the drill bit (100), and the gas channel is connected to the gas conveying device (02) through the input end; An end cover (230) is arranged at a port on the rotor tube (210) close to the input end. The end cover (230) has a blocking plate (231). The blocking plate (231) has a blocking state and a broken state that are relatively arranged. When the blocking plate (231) is in the blocking state, the blocking plate (231) blocks the installation channel, and gas can enter the gas channel; when the blocking plate (231) is in the broken state, the screen tube (01) can enter the inner cavity of the rotor tube (210).

2. The hollow screw drill according to claim 1, characterized in that: The end cover (230) further comprises a connecting pipe (232), wherein the connecting pipe (232) is connected to the rotor tube (210), the blocking plate (231) is fixedly arranged in the connecting pipe (232), and the connecting pipe (232) has a guide section (2321), wherein the guide section (2321) is located on a side of the blocking plate (231) away from the rotor tube (210), and the inner diameter of the guide section (2321) gradually decreases in a direction away from the rotor tube (210).

3. The hollow screw drill according to claim 2, characterized in that: A plurality of air guide holes (233) are arranged at annular intervals on the side wall of the guide section (2321).

4. The hollow screw drill according to claim 2, characterized in that: The connecting tube (232) further comprises a connecting section (2322), one end of the connecting section (2322) being fixedly connected to the rotor tube (210), and the other end of the connecting section (2322) being fixedly connected to the guide section (2321), the inner wall of the guide section (2321) having an annular slot, the connecting section (2322) having a connecting boss, the connecting boss being inserted into the slot, a gap being provided between the connecting boss and the bottom of the slot, and the blocking plate (231) being detachably arranged in the gap.

5. The hollow screw drill according to claim 1, characterized in that: The blocking plate (231) is made of glass.

6. The hollow screw drill according to claim 1, characterized in that: The drill bit (100) has a drill bit cavity (110), the drill bit cavity (110) is located on the installation channel, and the drill bit (100) is provided with a blade (120), the blade (120) is hinged on the side wall of the drill bit (100) to block or open the installation channel.

7. The hollow screw drill according to claim 1, characterized in that: The hollow screw drill also includes a measuring rod (300), which is detachably connected to the screw motor (200). The measuring rod (300) has a first inner tube (310) and a first outer tube (320). The first inner tube (310) is inserted into the first outer tube (320). The inner cavity of the first inner tube (310) is located on the installation channel. A sensor is provided on the outer wall of the first inner tube (310). The sensor is used to obtain the working status of the hollow screw drill when drilling.

8. The hollow screw drill according to claim 7, characterized in that: The hollow screw drilling tool also includes an extension rod (400), which is arranged at one end of the measuring rod (300) away from the screw motor (200), and the extension rod (400) has a second inner tube (410) and a second outer tube (420), the second inner tube (410) is inserted into the second outer tube (420), and the inner cavity of the second inner tube (410) is located on the installation channel, the first inner tube (310) and the second outer tube (420) are detachably connected, an electrical connection structure is arranged between the first inner tube (310) and the second outer tube (420), and the sensor is electrically connected to the electrical connection structure, and a signal line (430) is arranged between the second inner tube (410) and the second outer tube (420), and the signal line (430) is electrically connected to the electrical connection structure, and the signal line (430) is used to transmit the signal acquired by the sensor.

9. The hollow screw drill according to claim 8, characterized in that: The first inner tube (310) is inserted into the second outer tube (420); the inner wall of the second outer tube (420) is provided with a conductive ring (421); the conductive ring (421) is electrically connected to the signal line (430); the outer wall of the first inner tube (310) is provided with a first conductive seat (311); the first conductive seat (311) cooperates with the conductive ring (421) to form the electrical connection structure; the first conductive seat (311) comprises a first rubber ring (3111) and a plurality of first ring petals (3112); the first rubber ring (3111) is annularly arranged on the outer wall of the first inner tube (310); the plurality of first ring petals (3112) are annularly arranged on the first rubber ring (3111) at intervals; the first ring petals (3112) protrude from the circumferential side of the first rubber ring (3111); the first ring petals (3112) are electrically connected to the sensor.

10. The hollow screw drill according to claim 9, characterized in that: A plurality of extension rods (400) are provided, and the plurality of extension rods (400) are connected in sequence. A second conductive seat (422) is provided at a first end of the second inner tube (410) away from the conductive ring (421). The second conductive seat (422) comprises a second rubber ring and a plurality of second ring petals. The second rubber ring is arranged in an annular shape on the outer wall of the second inner tube (410). The plurality of second ring petals are arranged in an annular shape at intervals on the second rubber ring, and the second ring petals protrude from the circumferential side of the second rubber ring. The second ring petals are electrically connected to the conductive ring (421) via the signal line (430), and two adjacent extension rods (400) are electrically connected to the second conductive seat (422) via the conductive ring (421).

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