Auxiliary limiting structure for rock drill

Abstract

The utility model provides an auxiliary limiting structure for a rock drill, and relates to the technical field of rock drills, the auxiliary limiting structure comprises a lantern ring sleeved on a shell of the rock drill and provided with mounting holes uniformly distributed on an arc surface of the lantern ring; the supporting rods are hinged to the lantern ring and evenly distributed around the axis of the lantern ring. According to the self-adaptive rock wall supporting and low-loss transmission device, through the arranged lantern ring linkage sleeve structure, closed-loop control over self-adaptive rock wall supporting and low-loss transmission is achieved, when the sleeve axially slides under the counter-acting force of a rock wall, a limiting groove precisely guides a displacement path, a shifting wheel converts linear motion into radial expansion of a supporting rod, and a limiting spring is synchronously compressed to form an umbrella-shaped supporting network; and the stirring wheel is in rolling friction in the expansion process to reduce energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of rock drill technology, and more specifically, to an auxiliary limiting structure for rock drills. Background Technology

[0002] Rock drills are core equipment in mining, tunneling, and geological exploration, and their operating efficiency and drilling accuracy directly affect project progress and cost. Traditional rock drills break rock through impact rotation, but during drilling, complex geological conditions and equipment vibration can easily lead to hole position deviation or over-drilling, requiring auxiliary limiting structures to ensure operational accuracy. Existing technologies mostly employ mechanical limiting devices or sensor control systems, which trigger shutdown or adjust impact parameters by preset depth thresholds, effectively improving drilling positioning accuracy and automation levels, reducing the need for manual intervention, and showing significant advantages, especially in hard rock formations.

[0003] Rock cuttings generated during drilling accumulate at the bottom of the hole, easily clogging the signal channels of the limit sensor, leading to delayed or misjudged depth monitoring, and even causing equipment overload shutdown. Meanwhile, irregular hole walls or adhered rock cuttings in complex formations increase friction between the drill rod and the hole wall, making it difficult for the rock drill to successfully retract after drilling. This necessitates repeated adjustments to the impact energy or manual assistance in retracting the drill, extending the work cycle and exacerbating drill bit wear.

[0004] Therefore, we made improvements and proposed an auxiliary limiting structure for rock drills. Utility Model Content

[0005] In order to achieve the above-mentioned objectives, this utility model provides an auxiliary limiting structure for rock drills to improve the above-mentioned problems.

[0006] The application is as follows:

[0007] include:

[0008] The collar, fitted onto the outer casing of the rock drill, has the following characteristics:

[0009] Mounting holes are evenly distributed on the arc surface of the collar;

[0010] Support rods, hinged to the collar, and evenly distributed around the collar axis, with adjacent surfaces of each pair of support rods having:

[0011] A limiting spring is used to prevent the free ends of the support rods from moving away from each other.

[0012] The sleeve, which slides along the axis of the collar, is longer than the support rod and has the following features:

[0013] The limiting groove allows the mounting part of the mounting hole to pass through and forms a sliding path for the mounting part;

[0014] A buffer pad is provided at the contact surface between the sleeve and the rock wall;

[0015] The actuating wheels are evenly distributed on the sleeve and make rolling contact with the support rod;

[0016] When the sleeve and the collar are relatively displaced, the sleeve squeezes the support rod to open radially, and at the same time the support rod rubs the actuating wheel to rotate.

[0017] Preferably, the pre-compression of the limiting spring keeps the free end of the support rod in a retracted state in its natural state.

[0018] Preferably, the length of the limiting groove covers at least half the length of the sleeve.

[0019] Preferably, the surface of the actuating wheel is provided with a radial groove, and the contact end of the support rod and the actuating wheel is provided with a matching arc-shaped protrusion.

[0020] Preferably, the end of the limiting groove is provided with an inward arc-shaped flange.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] In the scheme of this application:

[0023] To address the problems of unstable support, high vibration transmission, and reset jamming in existing rock drills during rock breaking operations, this application implements a closed-loop control system for adaptive rock wall support and low-loss transmission through a collar-linked sleeve structure. When the sleeve slides axially under the reaction force of the rock wall, the limiting groove precisely guides the displacement path, and the actuating wheel converts linear motion into radial expansion of the support rod, synchronously compressing the limiting spring to form an umbrella-shaped support network. During the expansion process, the rolling friction of the actuating wheel reduces energy consumption. Attached Figure Description

[0024] Figure 1 This is a front view of the auxiliary limiting structure for a rock drill provided in this application;

[0025] Figure 2 A schematic diagram of the support rod structure for the auxiliary limiting structure of the rock drill provided in this application;

[0026] Figure 3 This is a schematic diagram of the sleeve structure of the auxiliary limiting structure for the rock drill provided in this application.

[0027] The image shows:

[0028] 1. Collar; 11. Mounting hole; 2. Support rod; 21. Limiting spring; 3. Sleeve; 31. Limiting groove; 32. Buffer pad; 33. Actuating wheel. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0030] For an example, please refer to... Figure 1 , Figure 2 and Figure 3 Auxiliary limiting structure for rock drills, including:

[0031] The collar 1, fitted onto the outer casing of the rock drill, has the following characteristics:

[0032] Mounting holes 11 are evenly distributed on the arc surface of collar 1;

[0033] Support rods 2 are hinged to collar 1 and evenly distributed around the axis of collar 1. The adjacent surfaces of any two support rods 2 have the following characteristics:

[0034] Limiting spring 21 restricts the free ends of support rod 2 from moving away from each other;

[0035] Sleeve 3, which slides along the axis of collar 1, has a length greater than that of support rod 2, and has the following features:

[0036] The limiting groove 31 allows the mounting part of the mounting hole 11 to pass through and forms a sliding path for the mounting part;

[0037] Buffer pad 32 is installed on the contact surface between sleeve 3 and rock wall;

[0038] The actuating wheels 33 are evenly distributed on the sleeve 3 and make rolling contact with the support rod 2;

[0039] When the sleeve 3 and the collar 1 are relatively displaced, the sleeve 3 squeezes the support rod 2 to open radially, and at the same time the support rod 2 rubs the actuating wheel 33 to rotate.

[0040] When the rock drill advances, causing the sleeve 3 to retract axially due to the reaction force from the rock wall, the sleeve 3 and the collar 1 experience relative displacement. At this time:

[0041] The sliding path of the sleeve 3 is precisely guided by the mounting part through the limiting groove 31 to ensure that the displacement is oriented along the axis; the actuating wheel 33 rolls and squeezes the support rod 2, converting the linear motion of the sleeve 3 into the radial expansion of the support rod 2; the preload of the limiting spring 21 is gradually overcome, so that the support rod 2 unfolds synchronously like umbrella ribs, forming distributed support points that match the irregular rock wall contour;

[0042] During the unfolding of support rod 2:

[0043] The rolling contact of the actuating wheel 33 transforms traditional sliding friction into low-resistance rolling, significantly reducing the energy consumption of the support rod 2 during deployment; the radial expansion force at the free end of the support rod 2 reacts to the sleeve 3 through the actuating wheel 33, pushing the buffer pad 32 to fit tightly against the rock wall; the buffer pad 32 simultaneously absorbs the impact of the rock wall and evenly distributes the reaction force to the sleeve 3.

[0044] When support rod 2 is fully extended:

[0045] The arc-shaped flange at the end of the limiting groove 31 makes hard contact with the mounting part, preventing the sleeve 3 from retracting excessively and providing mechanical displacement limit protection; the restoring force of the limiting spring 21 continues to act, causing the support rod 2 to automatically retract when the sleeve 3 moves forward, preventing the mechanism from jamming when retracting the drill; the reverse rolling of the actuating wheel 33 assists the support rod 2 to return to its original position smoothly, and at the same time, during the rotation, it will agitate the debris around the rock hole to fall off, so that the debris will not get stuck in the rock hole and make it difficult to remove the drill bit.

[0046] The pre-compression of the limiting spring 21 keeps the free end of the support rod 2 in a retracted state in its natural state;

[0047] When the sleeve 3 slides towards the collar 1, the actuating wheel 33 overcomes the preload of the limiting spring 21 and pushes the support rod 2 outward to form a bidirectional elastic limit.

[0048] The length of the limiting groove 31 covers at least half the length of the sleeve 3, providing a longer sliding distance for the sleeve 3, allowing the sleeve 3 to exert stronger pressure on the support rod 2, resulting in a more convenient way to remove the drill bit.

[0049] The surface of the actuating wheel 33 is provided with a radial groove, and the contact end of the support rod 2 with the actuating wheel 33 is provided with a matching arc-shaped protrusion;

[0050] The engagement of the groove and the protrusion converts sliding friction into rolling friction, while restricting the axial movement of the support rod 2 during the unfolding process.

[0051] The end of the limiting groove 31 is provided with an inward arc-shaped flange; when the sleeve 3 slides to the limit position, the mounting part of the mounting hole 11 abuts against the arc-shaped flange, and the sleeve 3 is prevented from coming out by mechanical hard limiting.

[0052] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. Auxiliary stop structure for rock drills, characterized in that include: The collar (1), fitted onto the outer shell of the rock drill, has the following characteristics: Mounting holes (11) are evenly distributed on the arc surface of the collar (1); Support rods (2) are hinged to the collar (1) and evenly distributed around the axis of the collar (1). The adjacent surfaces of each pair of support rods (2) have the following characteristics: A limiting spring (21) restricts the free ends of the support rods (2) from moving away from each other; The sleeve (3) is slidably disposed along the axis of the collar (1), and its length is greater than that of the support rod (2). It has the following features: The limiting groove (31) allows the mounting part of the mounting hole (11) to pass through and form a sliding path for the mounting part; A buffer pad (32) is provided on the contact surface between the sleeve (3) and the rock wall; The actuating wheels (33) are evenly distributed on the sleeve (3) and roll in contact with the support rod (2); When the sleeve (3) and the collar (1) are relatively displaced, the sleeve (3) squeezes the support rod (2) to open radially, and at the same time the support rod (2) rubs the actuating wheel (33) to rotate.

2. The auxiliary stop structure for a rock drill according to claim 1, characterized in that, The pre-compression of the limiting spring (21) keeps the free end of the support rod (2) in a closed state in its natural state.

3. The auxiliary stop structure for a rock drill according to claim 2, characterized in that The length of the limiting groove (31) covers at least half the length of the sleeve (3).

4. The auxiliary stop structure for a rock drill according to claim 3, characterized in that, The surface of the actuating wheel (33) is provided with a radial groove, and the contact end of the support rod (2) and the actuating wheel (33) is provided with a matching arc-shaped protrusion.

5. The auxiliary stop structure for a rock drill according to claim 4, characterized in that, The end of the limiting groove (31) is provided with an inward arc-shaped flange.

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