Dust collection cover for down-the-hole drill
By introducing ground anchors, lifting drive components, and dust-blocking components into the dust collection hood of the down-the-hole drilling rig, combined with the double-layer composite structure of the hood and distance sensor control, the problem of dust leakage caused by drilling vibration was solved, achieving more efficient dust collection and hood stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-24
- Publication Date
- 2026-03-31
AI Technical Summary
Traditional down-the-hole drill dust covers are prone to shifting under drilling vibration and swaying, leading to dust leakage. Furthermore, traditional sealing methods fail under vibration and compression, making them ineffective in blocking dust.
The design incorporates ground anchors and lifting drive components, with a double-layer composite structure. The outer layer is made of high-elasticity rubber, and the inner layer is made of lightweight alloy. Dust-blocking components and dust collection pipes are installed at the bottom of the cover. The position of the cover is adjusted by a distance sensor and controller to ensure sealing, and it is kept stable by hydraulic cylinders and anchor rods.
It effectively prevents dust leakage, improves dust collection efficiency, reduces drill cuttings accumulation, protects the working environment and personnel health, and enhances the stability and sealing of the cover.
Smart Images
Figure CN224064309U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of dust prevention technology for down-the-hole drilling rigs, and specifically relates to a dust collection cover for down-the-hole drilling rigs. Background Technology
[0002] Down-the-hole (DH) drills are rock drilling equipment used for drilling rocks. Their internal structure differs from that of ordinary rock drills. The front end of the impactor is connected to the drill bit, and the rear end is connected to the drill rod. The drill rod is connected to the power head. During operation, the power head pushes the drill rod, which in turn drives the impactor to perform impact drilling operations on the rock. DH drills generate a large amount of dust during the drilling process. Therefore, a dust collection hood needs to be installed at the drill bit to collect the dust generated during drilling and prevent dust from splashing around and polluting the environment.
[0003] When drilling with a down-the-hole drill, the violent vibration generated by the impactor is transmitted to the dust collection hood through the drill rod, causing the hood to move dynamically. As the drilling depth increases (especially when it exceeds 3m), the swing amplitude of the drill rod increases significantly, causing the dust collection hood to shift and creating a gap between the hood and the ground. Traditional dust collection hoods only rely on a rigid base or a flexible sealing ring to contact the ground. Under the combined effects of vibration and swaying, the rigid base is prone to detaching from the ground, while the flexible sealing ring fails due to compression deformation, further aggravating dust leakage. Utility Model Content
[0004] To address the above problems, the purpose of this utility model is to provide a dust collection cover for down-the-hole drilling rigs, thereby solving the problems mentioned in the background art.
[0005] This utility model provides a dust collection hood for a down-the-hole drill rig, including a hood body, which is hollow inside and has circular holes at both ends for the drill bit to pass through. The circular hole at the end of the hood body away from the ground forms a dynamic seal with the drill bit to prevent dust from overflowing. A ground anchor is provided on the side of the hood body closest to the ground to fix the relative position of the hood body and the ground during drilling and to suppress dynamic displacement of the hood body caused by drilling vibration. A lifting drive assembly is installed between the hood body and the down-the-hole drill frame to adjust the vertical position of the hood body according to the working state of the drill bit.
[0006] Preferably, it also includes a controller and a distance sensor installed at the bottom of the down-the-hole drill frame. The output end of the distance sensor is connected to the signal input end of the controller to provide the controller with a signal of the distance from the down-the-hole drill frame to the ground. The controller determines the distance from the bottom surface of the cover to the ground based on the signal in order to control the operation of the lifting drive assembly.
[0007] Preferably, the ground anchor is a rigid base embedded in the side of the cover near the ground and smaller in size than the cover, and a plurality of anchor rods evenly distributed along the circumference of the rigid base.
[0008] Preferably, the cross-section of the cover is annular, and its side surface is curved, which extends from the circumference of the cover's cross-section to both sides of the tire.
[0009] Preferably, the cover adopts a double-layer composite structure, with an outer layer of highly elastic rubber and an inner layer of lightweight alloy base surface, wherein the rubber layer and the alloy base surface are integrally formed by a vulcanization process.
[0010] Preferably, the lifting drive assembly is a hydraulic cylinder disposed between the end of the cover away from the ground and the drill frame of the down-the-hole drill.
[0011] Preferably, a dust-blocking component is provided at the circular hole at the end of the cover away from the ground. The dust-blocking component includes an annular base that is detachably connected to the end of the cover away from the ground; a rubber valve fixed inside the base, with multiple sets of V-shaped blades evenly distributed along the circumference of the annular base in its middle; and a dust-blocking brush located at the bottom of the rubber valve, consisting of multiple sets of nylon bristles.
[0012] Preferably, the cover is connected to the dust removal system of the down-the-hole drilling rig through a dust collection pipe. The dust collection pipe extends from the end of the cover away from the ground into the inner cavity of the cover, and a dust filter is installed at the end of the dust collection pipe located in the inner cavity of the cover.
[0013] The beneficial effects of this utility model are: by installing ground anchors at the bottom of the cover and installing a lifting drive assembly between the cover and the down-the-hole drill frame, when the lifting drive assembly drives the cover to move downward, it applies external force to the ground anchors, causing them to insert into the ground, thereby improving the stability of the cover and enabling it to stick to the ground when the drill bit is drilling, thus preventing dust from splashing out from the gap between the cover and the ground.
[0014] Meanwhile, by setting up a controller and a distance sensor, the distance sensor is installed at the bottom of the drilling rig frame to provide the controller with a signal of the distance between the drilling rig frame and the ground. The controller determines the distance from the bottom surface of the cover to the ground based on this signal and controls the lifting drive assembly to drive the cover to move the appropriate distance. Attached Figure Description
[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0016] Figure 2 This is a schematic diagram of the isometric structure of this utility model;
[0017] Figure 3 This is a cross-sectional structural diagram of the present invention;
[0018] Figure 4 This is a first-view structural diagram of the housing and the drill frame of the down-the-hole drill rig in the installation state of this utility model.
[0019] Figure 5This is a second-view structural diagram of the housing and the drill frame of the down-the-hole drill rig in the installation state of this utility model.
[0020] Figure 6 This is a cross-sectional structural diagram of the housing and the drill frame of the down-the-hole drill in the installation state of this utility model;
[0021] Figure 7 This is an enlarged structural diagram of point A in this utility model.
[0022] In the diagram: 1. Cover; 2. Drill tool; 3. Circular hole; 4. Ground anchor; 5. Lifting drive assembly; 6. Down-the-hole drill frame; 7. Distance sensor; 8. Rigid base; 9. Anchor bolt; 10. Hydraulic cylinder; 11. Annular base; 12. Rubber valve; 13. Dust collection pipeline; 14. Dust filter cover; 15. Flexible valve; 16. Guide sleeve; 17. Dust baffle. Detailed Implementation
[0023] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of this utility model in any way.
[0024] During drilling, the down-the-hole (DH) drill uses a high-frequency impact to break up the rock. The vibration energy is transmitted through the drill rod to the dust collection hood. Simultaneously, as the drilling depth increases, the drill rod's swing amplitude increases, potentially causing the dust collection hood to shift and fail, leading to dust leakage into the working environment. This not only pollutes the environment but also harms the workers. Furthermore, during drilling, compressed air impacts the rock strata through the drill bit, and the resulting drill cuttings are ejected in the opposite direction along the gap between the drill rod and the borehole wall under high-pressure airflow. Some of the drill cuttings accumulate at the bottom of the hood. Experimental data shows that when the drilling depth exceeds 3m, the drill cuttings accumulation rate at the bottom can reach 0.5-1kg / min (based on measured data from the 2022 issue of the journal *Mining Machinery*). Traditional dust collection hoods rely solely on a rigid base 8 or a flexible sealing ring to contact the ground. Drill cuttings accumulation raises the bottom of the hood 1, creating a gap between the rigid base 8 and the ground (the probability of seal failure reaches 70% when the gap is >5mm). The flexible sealing ring is deformed by the drill cuttings, reducing contact pressure (the air leakage rate increases fourfold when the sealing ring compression rate drops from 30% to 10%). Drill string vibration (frequency 50-120Hz) exacerbates the dispersed distribution of drill cuttings at the bottom of the hood 1, forming localized high accumulation areas (height differences can reach 20-30mm), causing the hood 1 to tilt (the anchoring force decreases by 60% when the tilt angle is >3°).
[0025] To address the aforementioned technical problems, this utility model employs the following improvements: Figure 1-7As shown, a dust collection hood for a down-the-hole drill rig includes a hollow hood 1 with circular holes 3 at both ends for the drill bit 2 to pass through, used to prevent dust from spilling out; a ground anchor 4 located on the side of the hood 1 closest to the ground, used to ensure the hood 1 is in close contact with the ground during drilling and to prevent displacement that could cause dust to splash; and a lifting drive assembly 5 installed between the hood 1 and the down-the-hole drill frame 6 (specifically, on a guide sleeve 16 at the bottom of the drill frame, which provides guidance for the drill bit 2, preventing it from tilting during drilling and reducing its swaying) and used to adjust the vertical position of the hood 1 according to the working state of the drill bit 2. The hood 1 has an annular cross-section and curved sides extending from the circumference of the hood 1 towards both sides of the tire. Similar to a tire, the inner cavity of the cover 1 forms a dust storage chamber to collect drill cuttings ejected in the opposite direction, reducing the amount of drill cuttings accumulating at the bottom of the cover 1 and preventing the formation of localized high accumulation areas at the bottom of the cover 1 that could lead to dust leakage. At the same time, the cover 1 adopts a double-layer composite structure, with an outer layer of highly elastic rubber and an inner layer of lightweight alloy base surface. The rubber layer and the alloy base surface are integrally formed through a vulcanization process. The part of the cover 1 that contacts the ground is the rubber layer, which is a flexible base surface that buffers the vibration of the drill bit 2 (shock absorption efficiency ≥70%) and has good shrinkage. It can be used for surface sealing of different forms such as mud and rocks, which can increase the dust collection effect. Meanwhile, the inner layer uses a lightweight alloy base surface to provide structural strength, prevent the cover 1 from deforming, maintain the stability of the cover 1, and prevent the cover 1 from deforming and losing its dust collection effect.Additionally, the ground anchor 4 consists of a rigid base 8, smaller than the cover 1, embedded in the side of the cover 1 closest to the ground, and multiple anchor rods 9 evenly distributed around the rigid base 8. The rigid base 8 is embedded in the cover 1 and connected to the lightweight alloy base surface, and the thickness of the rigid base 8 is the same as the thickness of the outer layer, ensuring the flatness of the ground surface of the cover 1. The lifting drive assembly 5 is a hydraulic cylinder 10 (or an electric push rod) located between the end of the cover 1 furthest from the ground and the drill frame 6 of the down-the-hole drill rig. During drilling, the hydraulic cylinder 10 drives the cover 1 to move downward, applying external force to the ground anchor 4, causing it to insert into the ground, thereby improving the stability of the cover 1 and ensuring it stays close to the ground when the drill 2 is drilling. Under the dual action of the anchor rods 9 and the hydraulic cylinder 10, the stability of the cover 1 is further increased, preventing the cover 1 from shifting too far. The movement of the cover 1 prevents dust from splashing out from the gap between the cover 1 and the ground. When drilling is not in progress, the hydraulic cylinder 10 drives the cover 1 to move upward and reset, while simultaneously pulling the anchor rod 9 out of the ground to prevent wear on the cover 1 when the down-the-hole drill moves. To prevent dust from leaking out from the gap between the cover 1 and the drill bit 2, a dust-blocking component is installed at the round hole 3 at the end of the cover 1 away from the ground. This dust-blocking component is used to form a dynamic seal with the drill bit. The dust-blocking component includes an annular base 11 that is detachably connected (e.g., bolted or threaded) to the end of the cover 1 away from the ground, a rubber valve 12 fixed inside the base and having multiple sets of V-shaped blades evenly distributed around the circumference of the annular base 11, and a dust-blocking brush 17 composed of multiple sets of nylon bristles located at the bottom of the rubber valve 12. Figure 7 As shown, both the rubber valve 12 and the dust bristle 17 are designed in annular shape. Multiple sets of V-shaped cutting edges cut the inner side of the rubber valve 12 into multiple elastic valves 15. When the drill bit 2 passes through the dust bristle assembly, the multiple elastic valves 15 and the side of the brush bristles away from the annular base 11 contact the surface of the drill bit 2, filling the gap between the drill bit 2 and the cover 1. This double shielding reduces or prevents dust from splashing out from the gap between the drill bit 2 and the cover 1. At the same time, a dust collection pipe 13 is installed on the top of the cover 1. One end of the dust collection pipe 13 extends through the cover 1 and into the interior of the cover 1. A dust filter hood 14 is connected to filter dust and prevent dust from clogging the dust collection pipe 13. The other end of the dust collection pipe 13 is connected to the down-the-hole drill dust removal system (vacuum cleaner). When the down-the-hole drill dust removal system is working, it creates a negative pressure inside the dust collection pipe 13 and the cavity of the hood 1. Dust entering the hood 1 is filtered by the dust filter hood 14, which filters out larger particles generated during drilling and prevents them from entering the down-the-hole drill dust removal system. The dust is absorbed into the down-the-hole drill dust removal system along the dust filter hood 14 and the dust collection pipe 13, preventing it from spreading to the outside.
[0026] Furthermore, such as Figure 4As shown, to prevent the cover 1 from being excessively squeezed by the hydraulic cylinder 10, a controller and a distance sensor 7 electrically connected to the controller are also provided at the bottom of the down-the-hole drill frame 6. This distance sensor 7 can be an ultrasonic distance sensor or an infrared distance sensor. For the ultrasonic distance sensor 7, a transparent plastic sheet can be installed at the bottom of the down-the-hole drill frame 6 to prevent flying dust from damaging the distance sensor 7. The distance sensor 7 is used to monitor the signal of the distance between the down-the-hole drill frame 6 and the ground. The controller determines the distance from the bottom surface of the cover 1 to the ground based on this signal to control the operation of the lifting drive assembly 5. Specifically, for example, if the distance from the upper surface to the lower surface of the cover 1 is 50 cm, the length of the anchor rod 9 is 20 cm, and the distance from the down-the-hole drill frame 6 to the ground is 1 meter, then the hydraulic cylinder 10 needs to drive the cover 1 downwards by 51-52 cm to ensure that the cover 1 is tightly fitted to the ground. Figure 2 As shown, the size of the cover 1 is much larger than the size of the drill bit, and the anchor rod 9 is also installed far away from the drill bit. When the drill bit is drilling, the soil around the hole is soft. Installing the anchor rod 9 away from the drill bit can prevent the anchor rod 9 from detaching from the ground. To further ensure that the cover 1 can be stably attached to the ground, multiple distance sensors 7 (not shown in the figure) can be installed on the drill frame 6 of the down-the-hole drill rig to monitor the distances from the drill frame 6 to the ground at multiple points around the cover 1. Alternatively, large rocks on the ground can be cleared before drilling to ensure the accuracy of the distance sensors 7.
Claims
1. A dust collecting hood for a roof bolter, characterized by, The utility model relates to a dustproof cover for a downhole drill, comprising: a cover body (1) which is hollow inside and has a circular hole (3) at both ends for a drill (2) to pass through, the circular hole (3) at the end of the cover body (1) away from the ground forms a dynamic seal with the drill (2) to prevent dust from overflowing; a ground anchor (4) arranged on the side of the cover body (1) close to the ground to fix the relative position of the cover body (1) and the ground during drilling by the drill (2) and to prevent dynamic displacement of the cover body (1) caused by drilling vibration; a lifting drive assembly (5) installed between the cover body (1) and a downhole drill rig (6) to adjust the position of the cover body (1) in the vertical direction according to the working state of the drill (2).
2. A dust collecting hood for a roof bolter as claimed in claim 1, characterised in that: The utility model further comprises a controller and a distance measuring sensor (7) installed at the bottom of the downhole drill rig (6), the output end of the distance measuring sensor (7) is connected to the signal input end of the controller to provide a signal of the distance from the downhole drill rig (6) to the ground to the controller, and the controller judges the distance from the bottom surface of the cover body (1) to the ground according to the signal to control the operation of the lifting drive assembly (5).
3. A dust collecting hood for a roof bolter as defined in claim 1, characterized in that: The ground anchor (4) is a rigid base (8) embedded on the side of the cover body (1) close to the ground and smaller in size than the cover body (1) and a plurality of anchor rods (9) evenly distributed along the circumference of the rigid base (8).
4. The dust collecting hood for a roof bolter according to claim 1, characterized in that: The cross section of the cover body (1) is annular, and the side surface is a curved surface extending from the cross section of the cover body (1) to both sides of the tire.
5. A dust collecting hood for a roof bolter as claimed in claim 4, characterised in that: The cover body (1) adopts a double-layer composite structure, the outer layer is a high-elasticity rubber layer, and the inner layer is a lightweight alloy base surface, and the rubber layer and the alloy base surface are integrally formed through a vulcanization process.
6. A dust collecting hood for a roof bolter as defined in claim 1, characterized in that: The lifting drive assembly (5) is a hydraulic cylinder (10) arranged between the end of the cover body (1) away from the ground and the downhole drill rig (6).
7. A dust collecting hood for a roof bolter as defined in claim 1, characterized in that: A dust blocking assembly is arranged at the circular hole (3) at the end of the cover body (1) away from the ground, and the dust blocking assembly comprises: a ring-shaped base body (11) detachably connected to the end of the cover body (1) away from the ground; a rubber valve (12) fixed to the inner side of the base body, the middle part of which is evenly distributed with a plurality of V-shaped knife edges along the circumference of the ring-shaped base body (11); a dust blocking brush (17) arranged at the bottom of the rubber valve (12) and composed of a plurality of nylon brush hairs.
8. A dust collecting hood for a roof bolter as defined in claim 1, characterized in that: The cover body (1) is connected to a dust removal system of the downhole drill through a dust collecting pipeline (13), the dust collecting pipeline (13) extends to the inner cavity of the cover body (1) through the end of the cover body (1) away from the ground, and a dust filter cover (14) is installed at one end of the dust collecting pipeline (13) in the inner cavity of the cover body (1).