A negative pressure chip taking device based on a mine drilling chip method

Abstract

The utility model relates to the technical field of mine safety equipment, especially based on the negative pressure takes the device of taking off of mine drilling cuttings method, include: negative pressure dust absorption pipe, its one end connects negative pressure source for generating suction airflow, dust absorption head is connected in the other end of negative pressure dust absorption pipe for aiming at and plugging the drilling hole mouth, dust absorption head includes: base and multicavity seal ring, multicavity seal ring is constituted by at least three independent sealing chambers arranging along the circumferential direction, every independent sealing chamber is connected with an independent inflation control passage respectively, pressure sensing unit and control unit, and control unit is configured as: according to the pressure value of each pressure sensing unit feedback, independently controls the inflation state of corresponding independent sealing chamber, the utility model discloses through the whole type seal ring is improved for multicavity independent controllable structure, and introduces pressure sensing feedback and closed loop control logic, solved the sealing problem of negative pressure takes the device when facing the irregular, broken drilling hole mouth in the pit.

Description

Technical Field

[0001] This utility model relates to the field of mining safety equipment technology, and in particular to a negative pressure chip removal device based on the mining cuttings method. Background Technology

[0002] The drilling cuttings method (also known as the drilling cuttings volume method) is a key method for monitoring stress in underground coal seams and providing early warning of rockburst hazards. Its principle is to drill holes in the coal and rock mass, collect and weigh the coal (rock) cuttings drilled out, and inversely determine the stress concentration around the roadway based on the amount of drilling cuttings and its variation. Therefore, efficient, complete and pollution-free collection of drilling cuttings samples is the primary prerequisite for ensuring the accuracy of this method.

[0003] Currently, negative pressure cuttings collection devices are commonly used. These devices typically consist of a negative pressure fan, a suction hose, and a suction head at one end. The suction head is pushed towards the borehole opening, and the negative pressure draws the drilled cuttings into a collection container. However, in the complex downhole environment, this technology has significant drawbacks: Downhole rock walls are often uneven, and borehole openings are prone to micro-fractures or irregular shapes due to construction vibrations. Existing cuttings suction heads are mostly rigid flared mouths or simple rubber ring structures, which are difficult to form an effective seal with such irregular openings. A large amount of external air is drawn in through the gaps, which seriously dilutes the negative pressure at the opening, resulting in insufficient suction power. A large amount of drill cuttings (especially lighter fine particles) escape into the roadway air, causing not only sample loss and data distortion, but also serious pollution of the working environment. The existing device's chip suction head lacks adaptive adjustment capability; when faced with elliptical, cracked, or severely broken orifices, it cannot dynamically compensate for sealing pressure, often requiring manual and repeated adjustments to the device angle or padding material, which is cumbersome and has unstable results, greatly affecting monitoring efficiency. The entire sealing and suction process relies on manual observation and experience-based judgment, making it impossible to perceive the sealing status in real time. Operators cannot know when the seal reaches its optimal state to begin efficient sampling, nor can they receive immediate alerts when the seal fails.

[0004] Therefore, to address the above problems, a negative pressure cuttings removal device based on the mining cuttings method is proposed. By improving the integral sealing ring into a multi-chamber independently controllable structure and introducing pressure sensing feedback and closed-loop control logic, the sealing problem of the negative pressure cuttings removal device when facing irregular and broken borehole openings in the well is solved. Utility Model Content

[0005] In order to overcome the problems of poor sealing reliability and limited adaptability when using traditional negative pressure chip removal devices on irregular and uneven rock walls.

[0006] The technical solution of this utility model is: a negative pressure cuttings removal device based on the mining drill cuttings method, comprising: The negative pressure dust suction pipe is connected to a negative pressure source at one end to generate suction airflow; The chip suction head, connected to the other end of the negative pressure chip suction tube, is used to align and seal the borehole opening; The dust suction head includes: A base is fixedly connected to the negative pressure dust suction pipe; A multi-chamber sealing ring is fixedly installed at the front end of the base to form a seal with the rock wall around the borehole opening; The multi-chamber sealing ring is composed of at least three independent sealing chambers arranged in a circumferential direction; Each of the aforementioned independent sealed chambers is connected to an independent inflation control passage; A pressure sensing unit is disposed on the surface of each of the independent sealed chambers that contacts the rock wall, for detecting the contact pressure between the chamber and the rock wall; The control unit is connected to each of the pressure sensing units and each of the inflation control paths, respectively. The control unit is configured to independently control the inflation state of the corresponding independent sealed chamber based on the pressure value fed back by each of the pressure sensing units.

[0007] Preferably, the control unit receives pressure feedback signals from each pressure sensing unit in real time and independently and specifically controls the inflation state of the corresponding sealing chamber based on the differences in these signals. When the contact pressure in the area corresponding to a certain chamber is insufficient due to the orifice being recessed or broken (i.e., there is a risk of leakage), the control unit will instruct to supplement the inflation of that specific chamber to further expand it and fill the gap. For areas where the contact pressure is already sufficient, the air pressure is maintained unchanged. Through this mechanism of zoned sensing and on-demand compensation, the entire sealing ring can ultimately form a balanced and tight fit with the irregular rock wall orifice in all directions, thereby achieving a reliable seal throughout the entire area.

[0008] Preferably, the inflation control path includes: A public air pump; A multi-port control valve has its inlet connected to the common air pump and its multiple outlets connected to the corresponding independent sealed chambers via independent air guide pipes. The control unit is signal-connected to the multi-way control valve and is used to control the opening and closing and the degree of opening of each air outlet.

[0009] Preferably, the logic for controlling inflation in the control unit includes: Provide a uniform initial air pressure to all the aforementioned independent sealed chambers, causing them to initially expand and come into contact with the rock wall; Read the values ​​of each pressure sensing unit and identify the chambers whose pressure values ​​are lower than a preset threshold; The multi-way control valve is controlled to supplement air only to chambers whose pressure values ​​are lower than a preset threshold until their pressure values ​​reach or exceed the preset threshold.

[0010] Preferably, each independent sealing chamber of the multi-chamber sealing ring is a fan-shaped structure cut radially, and all independent sealing chambers are spliced ​​together in the circumferential direction to form a complete annular sealing structure.

[0011] Preferably, the independent sealed chambers are made of wear-resistant elastic material, and each chamber is detachably connected to the base.

[0012] Preferably, the device further includes a fixing bracket, the fixing bracket comprising: A base with a strong magnet; A multi-jointed universal arm, one end of which is connected to the base, and the other end of which is connected to the base of the negative pressure suction pipe or the suction head.

[0013] The beneficial effects of this utility model are: This invention solves the sealing problem of negative pressure cuttings sampling devices when facing irregular and broken borehole openings by improving the integral sealing ring into a multi-chamber independently controllable structure and introducing pressure sensing feedback and closed-loop control logic. It realizes the transformation from passive fitting to active adaptation, can identify weak points in the seal and dynamically compensate for them, and ensures that a reliable negative pressure zone can be formed under various complex borehole conditions, thereby significantly improving the cuttings sampling rate and effectively preventing sample leakage and environmental pollution. This device can intelligently adapt to boreholes of different shapes and integrity to achieve dynamic and reliable sealing, thereby ensuring high integrity and low environmental pollution of cuttings sampling. Attached Figure Description

[0014] Figure 1 The diagram shown is a three-dimensional structural schematic of the negative pressure chip removal device based on the mining drill cuttings method of this utility model. Figure 2 The diagram shown is a partial three-dimensional structural schematic of the negative pressure chip removal device based on the mining cuttings method of this utility model. Figure 3 The image shown is a side view of the negative pressure chip removal device based on the mining cuttings method of this utility model. Explanation of reference numerals in the attached drawings: 1. Negative pressure suction pipe; 2. Suction head; 21. Base; 22. Multi-chamber sealing ring; 221. Sealing chamber; 222. Inner ring skeleton; 223. Inflation port; 2211. Rubber bladder; 2212. Fan-shaped back plate; 3. Fixture; 31. Base; 32. Universal arm; 33. Clamp; 4. Electrical control box; 41. Pressure sensor. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Example 1 Please see Figure 1 , Figure 2 and Figure 3 This utility model provides an embodiment: a negative pressure cuttings removal device based on the mining drill cuttings method, comprising: The negative pressure suction pipe 1 is connected at one end to a negative pressure source to generate suction airflow; The chip suction head 2 is connected to the other end of the negative pressure chip suction pipe 1 and is used to align and seal the borehole opening; The lint suction head 2 includes: A base 21 is fixedly connected to the negative pressure dust suction pipe 1; A multi-chamber sealing ring 22 is fixedly installed at the front end of the base 21 to form a seal with the rock wall around the borehole opening; The multi-chamber sealing ring 22 is composed of at least three independent sealing chambers 221 arranged in a circumferential direction; Each independent sealed chamber 221 is connected to an independent inflation control passage; A pressure sensing unit is disposed on the surface of each independent sealed chamber 221 that contacts the rock wall, for detecting the contact pressure between the chamber and the rock wall; The control unit is connected to each pressure sensing unit and each inflation control path signal respectively; The control unit is configured to independently control the inflation state of the corresponding independent sealed chamber 221 based on the pressure value fed back by each pressure sensing unit.

[0017] The control unit receives pressure feedback signals from each pressure sensing unit in real time and independently and specifically controls the inflation state of the corresponding sealing chamber 221 based on the differences in these signals. When the contact pressure in a certain area of ​​a chamber is insufficient due to the orifice being recessed or broken (i.e., there is a risk of leakage), the control unit will instruct to supplement the inflation of that specific chamber to further expand it and fill the gap. For areas where the contact pressure is already sufficient, the air pressure is kept constant. Through this mechanism of zoned sensing and on-demand compensation, the entire sealing ring can ultimately form a balanced and tight fit with the irregular rock wall orifice in all directions, thereby achieving a reliable seal throughout the entire area.

[0018] Furthermore, the inflation control pathway includes: A public air pump; A multi-port control valve has an inlet connected to a common air pump and multiple outlets connected to corresponding independent sealed chambers 221 via independent air guide pipes. The control unit is connected to the multi-way control valve and is used to control the opening and closing of each air outlet and the degree of opening.

[0019] Furthermore, the control unit's logic for controlling inflation includes: Provide a uniform initial air pressure to all independent sealed chambers 221, causing them to initially expand and come into contact with the rock wall; Read the values ​​of each pressure sensing unit and identify the chambers whose pressure values ​​are lower than a preset threshold; Control the multi-way control valve to supplement air only to chambers with pressure values ​​below a preset threshold until their pressure values ​​reach or exceed the preset threshold. This logic avoids rubber fatigue or energy waste caused by overall overcharging, achieving precise and energy-saving adaptive sealing.

[0020] Furthermore, each independent sealing chamber 221 of the multi-chamber sealing ring 22 is a fan-shaped structure with radial sectioning, and all independent sealing chambers 221 are spliced ​​together in the circumferential direction to form a complete annular sealing structure; this structure is beneficial for uniform pressure distribution and manufacturing process.

[0021] Furthermore, the independent sealed chambers 221 are made of wear-resistant elastic material, and each chamber is detachably connected to the base 21; specifically, quick installation can be achieved through a slot structure, so that a chamber can be quickly replaced individually after accidental damage, without scrapping the entire dust collection head 2, which greatly reduces maintenance costs and time.

[0022] Furthermore, the device also includes a fixing bracket 3, which includes: A base 31 with a strong magnet; it can instantly attach to ferromagnetic components such as steel beams and drill rig housings; A multi-joint universal arm 32 is connected at one end to a base 31 and at the other end to a base 21 of a negative pressure suction pipe 1 or a suction head 2. By adjusting the joints of the universal arm 32, the operator can easily adjust and fix the suction head 2 in the optimal hole position.

[0023] Through the above steps, the integral sealing ring is improved into a multi-chamber independently controllable structure, and pressure sensing feedback and closed-loop control logic are introduced, thereby solving the sealing problem of the negative pressure cuttings sampling device when facing irregular and broken drill holes in the well. It realizes the transformation from passive fitting to active adaptation, can identify weak points in the seal and dynamically compensate for them, and ensures that a reliable negative pressure zone can be formed under various complex well conditions, thereby significantly improving the cuttings sampling rate and effectively preventing sample leakage and environmental pollution. This device can intelligently adapt to drill holes of different shapes and integrity, achieve dynamic and reliable sealing, and thus ensure high integrity and low environmental pollution of cuttings sampling.

[0024] Example 2 Optionally, this embodiment elaborates on the core structure of the present invention, namely the dust suction head 2 with adaptive sealing function and its control system.

[0025] This embodiment provides a negative pressure chip removal device based on the mining cuttings method, which mainly includes: a negative pressure chip suction pipe 1, a chip suction head 2, a fixed bracket 3, and an electrical control box 4.

[0026] The negative pressure chip suction pipe 1 is a flexible and wear-resistant pipe. One end of it is connected to the negative pressure source through a quick connector. The negative pressure source is usually an explosion-proof centrifugal fan. The other end is fixedly connected to the chip suction head 2. A chip suction channel is formed inside the negative pressure chip suction pipe 1.

[0027] The chip suction head 2 includes a base 21 and a multi-chamber sealing ring 22; the base 21 is a shell made of metal or high-strength engineering plastic, one end of which is connected to the flange of the negative pressure chip suction pipe 1, and the internal cavity is in communication with the channel of the negative pressure chip suction pipe 1; the other end of the base 21 is designed with an installation interface.

[0028] The multi-chamber sealing ring 22 is detachably mounted on the mounting interface at the front end of the base 21 by bolts; such as Figure 2 and Figure 3 As shown, in this embodiment, the multi-chamber sealing ring 22 is composed of six independent sealing chambers 221 evenly arranged along the circumferential direction; each sealing chamber 221 is a fan-shaped bladder made of wear-resistant rubber (such as nitrile rubber NBR or polyurethane PU); the six fan-shaped bladders are fixed together by their common inner ring skeleton 222, forming a complete circular ring structure; each sealing chamber 221 is provided with an independent inflation port 223.

[0029] The key to this embodiment lies in the inflation control path and sensing system: a miniature explosion-proof air pump and a small multi-way control valve are installed in the electrical control box 4; the air outlet of the common air pump is connected to the main air inlet of the multi-way control valve; the six air outlets of the multi-way control valve are respectively connected to the dust suction head 2 through six independent air guide pipes, and finally connected to the inflation interface 223 of the six sealed chambers 221 one by one.

[0030] On the outer surface of each sealed chamber 221 that contacts the rock wall (i.e., the arc surface of the fan-shaped bladder), a flexible thin-film pressure sensor 41 is embedded; the signal lines of these sensors are then connected to the electrical control box 4.

[0031] The control unit is integrated inside the electrical control box 4. Its core can be a programmable logic controller (PLC) or a microcontroller. The control unit is electrically connected to the multi-way control valve, each pressure sensor 41, the air pump and an optional handheld remote control terminal via cables.

[0032] The working principle and steps of this embodiment are as follows: The operator roughly aligns the chip suction head 2 with the drilling hole opening A through the fixing support 3, and pushes it forward to make the multi-chamber sealing ring 22 initially contact the rock wall B around the hole opening.

[0033] The operator issues a start command via a button or a remote controller. After receiving the command, the control unit first starts the air pump, and controls all the gas outlet branches of the multi-way control valve to open at the same opening degree, so as to synchronously fill all six sealing chambers 221 with gas at a relatively low pressure (for example, the initial air pressure P_init is set to 0.05-0.1 MPa); this step enables the six fan-shaped bladders to expand uniformly and gently, and initially fit the contour of the hole opening.

[0034] After the gas charging is briefly stabilized (for example, 2 seconds later), the control unit simultaneously reads the real-time pressure values P_i (i=1,2,…6) fed back by the six pressure sensors 41; a preset sealing compliance pressure threshold P_th (for example, 0.15MPa) is stored in the control unit; the control unit compares each P_i with P_th.

[0035] The logical judgment of the control unit 45 is as follows: For all sealing chambers 221 where P_i ≥ P_th, it is determined that the sealing in this area is good, and the control unit instructs the multi-way control valve to close the corresponding gas outlet branch to stop charging gas into it; For any sealing chamber 221 where P_j<P_th (assuming that there is a depression or breakage in the hole opening area corresponding to the j-th chamber), this area is determined as a sealing weak point; the control unit then instructs the multi-way control valve to individually increase the opening degree of the gas outlet branch leading to the j-th chamber, while keeping the air pump in operation, so as to perform supplementary gas charging only to the j-th chamber.

[0036] During the supplementary gas charging process, the control unit continuously monitors the feedback value of the pressure sensor 41 of the j-th chamber; once P_j rises to ≥ P_th, the corresponding gas outlet branch is immediately closed; this process can be performed on multiple low-pressure chambers at the same time; finally, when the control unit detects that the pressure values P_i of all six chambers meet the condition of ≥ P_th, it is determined that the adaptive sealing is completed; at this time, the control unit can light up the green indicator light or send a "sealing ready" signal to the handheld terminal.

[0037] After receiving the ready signal, the operator can start the main negative pressure fan; since the full-area close fit between the chip suction head 2 and the irregular hole opening A has been achieved through the above process, and the leakage points are effectively sealed, a stable high negative pressure zone can be formed at the hole opening A, and the drilling cuttings drilled out by the drill pipe C are efficiently sucked into the negative pressure chip suction pipe 1 with almost no escape.

[0038] Embodiment 3 Optionally, this embodiment further optimizes the mechanical structure of the sealing ring based on embodiment 2, focusing on maintainability.

[0039] In this embodiment, each independent sector-shaped sealing chamber 221 of the multi-chamber sealing ring 22 has the following specific structure: it includes a flexible rubber bladder 2211 and a rigid sector-shaped back plate 2212; the rubber bladder 2211 is bonded to one side of the sector-shaped back plate 2212; the six sector-shaped back plates 2212 engage with each other through the slots on their sides and the buckles on the common inner ring skeleton 222 to achieve quick assembly and locking, and together form a complete ring.

[0040] The inner ring skeleton 222 is connected to the base 21 of the dust suction head 2 by a ring of bolts. When a single sealed chamber 221 needs to be replaced, simply loosen the mounting bolts of the base 21, remove the entire multi-chamber sealing ring 22, and then manually move the fan-shaped back plate 2212 corresponding to the damaged chamber to disengage its clip from the inner ring skeleton 222. The damaged chamber module can then be removed individually. Align the clip of the new chamber module of the same specification with the skeleton clip and press it into place to complete the replacement. Finally, reinstall the repaired sealing ring back into the base 21. This design reduces maintenance time from hours to minutes and eliminates the need to replace the entire expensive component, significantly reducing operating costs.

[0041] Example 4 Optionally, this embodiment provides a more complete and easier-to-use downhole operation system based on embodiment 2 or 3.

[0042] The fixed support 3 includes a strong magnet base 31 and a multi-joint universal arm 32. The bottom surface of the strong magnet base 31 is a neodymium iron boron permanent magnet, which can instantly and firmly attach to the metal support beam of the tunnel, the drilling rig body, or any iron surface. The multi-joint universal arm 32 consists of multiple connecting rods connected by ball joints or knob locking joints. One end of the arm is connected to the base 31, and the other end is tightly clamped to the base 21 of the negative pressure suction pipe 1 or the suction head 2 by a clamp 33. By loosening and locking the knobs of each joint, the operator can flexibly adjust the suction head 2 to any desired spatial position and angle, and align it with the drill hole at different heights and directions. After adjustment, locking the knob will stably support the device, freeing the operator's hands.

[0043] The operation process of this utility model is as follows: transport the device to the drilling position → use the magnetic base 31 and universal arm 32 to initially position the chip suction head 2 → push the device to make the multi-chamber sealing ring 22 contact the hole opening → start the control unit to execute the intelligent sealing program → after sealing is ready, start the main negative pressure fan to perform efficient and dust-free sampling → after sampling is completed, the control unit controls the multi-way valve to exhaust the air, and the sealing ring retracts and resets → release the universal arm 32 clamp 33 and remove the device.

[0044] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A negative pressure cuttings removal device based on the mining drill cuttings method, characterized in that: include: The negative pressure suction pipe (1) is connected at one end to a negative pressure source to generate suction airflow; The chip suction head (2) is connected to the other end of the negative pressure chip suction tube (1) and is used to align and seal the borehole opening; The dust suction head (2) includes: A base (21) is fixedly connected to the negative pressure suction pipe (1); A multi-chamber sealing ring (22) is fixedly installed at the front end of the base (21) to form a seal with the rock wall around the borehole opening; The multi-chamber sealing ring (22) is composed of at least three independent sealing chambers (221) arranged in the circumferential direction; Each of the independent sealed chambers (221) is connected to an independent inflation control passage; A pressure sensing unit is disposed on the surface of each of the independent sealed chambers (221) that contacts the rock wall, for detecting the contact pressure between the chamber and the rock wall; The control unit is connected to each of the pressure sensing units and each of the inflation control paths, respectively. The control unit is configured to independently control the inflation state of the corresponding independent sealed chamber (221) based on the pressure value fed back by each of the pressure sensing units.

2. The negative pressure cuttings removal device based on the mining drill cuttings method according to claim 1, characterized in that: The inflation control path includes: A public air pump; A multi-port control valve has its inlet connected to the common air pump and its multiple outlets connected to the corresponding independent sealed chamber (221) via independent air guide pipes. The control unit is signal-connected to the multi-way control valve and is used to control the opening and closing and the degree of opening of each air outlet.

3. A negative pressure cuttings removal device based on the mining cuttings method according to claim 2, characterized in that: The logic for controlling inflation in the control unit includes: Provide a uniform initial air pressure to all the individual sealed chambers (221) to allow them to initially expand and come into contact with the rock wall; Read the values ​​of each pressure sensing unit and identify the chambers whose pressure values ​​are lower than a preset threshold; The multi-way control valve is controlled to supplement air only to chambers whose pressure values ​​are lower than a preset threshold until their pressure values ​​reach or exceed the preset threshold.

4. A negative pressure cuttings removal device based on the mining drill cuttings method according to claim 1, characterized in that: Each independent sealing chamber (221) of the multi-chamber sealing ring (22) is a fan-shaped structure cut radially, and all independent sealing chambers (221) are spliced ​​together in the circumferential direction to form a complete annular sealing structure.

5. A negative pressure cuttings removal device based on the mining drill cuttings method according to claim 1, characterized in that: The independent sealed chambers (221) are made of wear-resistant elastic material, and each chamber is detachably connected to the base (21).

6. A negative pressure cuttings removal device based on the mining drill cuttings method according to claim 1, characterized in that: The device further includes a fixing bracket (3), the fixing bracket (3) comprising: A base with a strong magnet (31); A multi-joint universal arm (32) is connected at one end to the base (31) and at the other end to the base (21) of the negative pressure suction pipe (1) or the suction head (2).

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