Hydraulic rock drill front guide waterproof structure

Abstract

The utility model relates to tunnel construction machinery technical field, concretely relates to a kind of hydraulic rock drill front guide waterproof structure, drill tail transmission is connected on the rotary mechanism of hydraulic rock drill, front guide waterproof structure includes the water injection sleeve for being set on the outer periphery of drill tail, holds sleeve, head casing, waterproof cover and buffer pad;The head casing is used to be connected to the rotary mechanism of the hydraulic rock drill, the holding sleeve and the water injection sleeve are installed in the inside of the head casing, the holding sleeve is located between the rotary mechanism of the hydraulic rock drill and the water injection sleeve;The waterproof cover is connected to the head casing, the buffer pad is installed between the end surface of the waterproof cover and the head casing.The utility model's hydraulic rock drill front guide waterproof structure, by the structure cooperation of waterproof cover, buffer pad and head casing, drill tail and waterproof cover can be prevented from relative motion, avoid the problem that gap increases due to abrasion, waterproof effect weakens.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction machinery technology, and in particular to a waterproof structure for the front guide of a hydraulic rock drill. Background Technology

[0002] Hydraulic rock drills are the most critical equipment in drill-and-blast tunnel construction. The operation of a rock drill includes functions such as impact, rotation, propulsion, flushing, and lubrication. Flushing primarily aims to remove rock debris generated during drilling and cool the drill bit, ensuring it can press firmly against the rock face to prevent dry drilling and extend the life of the drill bit. However, during tunnel construction, the flushing water is often acidic and typically enters the rock drill head along the drill rod. In this situation, if the waterproofing structure of the drill head is inadequate, parts are highly susceptible to corrosion, severely impacting the normal operation and reliability of the rock drill.

[0003] Currently, the most common waterproof structure for hydraulic rock drill heads on the market uses embedded sealing rings within the drill body. Specifically, a water seal is embedded in the guide sleeve at one end of the drill bit to prevent flushing water from entering the drill head and thus avoiding corrosion. However, due to the repeated impact of the impact piston and the rebound of the rock, the guide sleeve may experience radial impact force from the drill bit, leading to stress concentration, deformation of the guide sleeve, or failure of the water seal. If this occurs, external flushing water can enter the drill head through the gap between the guide sleeve and the drill bit, causing corrosion.

[0004] In addition, there is a waterproof structure on the market that connects a waterproof cover to the front end of the water injection sleeve of a rock drill. However, in this structure, the waterproof cover is connected to the drill head by bolts. When the drill bit is impacted by the impact piston, relative movement occurs between the drill bit and the waterproof cover, inevitably causing wear. When the wear reaches a certain level, the inner diameter of the center hole of the waterproof cover will be larger than the outer diameter of the drill bit. At this point, the waterproof cover fails, and flushing water will enter the rock drill head along the gap, causing parts to rust.

[0005] Therefore, there is an urgent need for a waterproof structure that is not prone to waterproofing failure due to relative movement between the drill bit and the waterproof cover to solve the above-mentioned technical problems. Utility Model Content

[0006] The main purpose of this utility model is to provide a waterproof structure for the front of a hydraulic rock drill, which aims to solve the technical problem that the existing waterproof structure of the hydraulic rock drill head is prone to waterproof failure due to relative movement between the drill bit and the waterproof cover.

[0007] To achieve the above objectives, this utility model proposes a waterproof leading structure for a hydraulic rock drill. The drill bit is driven and connected to the rotary mechanism of the hydraulic rock drill. The waterproof leading structure includes a water-filled sleeve, a gripping sleeve, a drill head housing, a waterproof cover, and a buffer pad, all fitted onto the outer periphery of the drill bit. The drill head housing is connected to the rotary mechanism of the hydraulic rock drill. The gripping sleeve and the water-filled sleeve are installed inside the drill head housing, with the gripping sleeve located between the rotary mechanism and the water-filled sleeve. The waterproof cover is connected to the drill head housing, and the buffer pad is installed between the waterproof cover and the end face of the drill head housing.

[0008] The improved waterproof structure of the hydraulic rock drill is further enhanced by the fact that a gasket is provided between the grip sleeve and the rotary mechanism of the hydraulic rock drill.

[0009] The improved hydraulic rock drill front waterproof structure of this utility model is that the water injection sleeve is provided with a water cavity, which is connected to the flushing hole of the drill bit tail, and the two ends of the water cavity are respectively embedded with a first water seal.

[0010] The improved waterproof structure of the hydraulic rock drill is further enhanced by the fact that a second water seal is embedded in the handle sleeve.

[0011] The improved hydraulic rock drill front waterproof structure of this utility model is that the inner diameter of the central hole of the waterproof cover is smaller than the outer diameter of the end of the drill bit rod. The waterproof cover and the drill bit are installed by an interference fit, and the interference fit part is provided with annular anti-slip texture along the axial direction.

[0012] The improvement of the hydraulic rock drill front waterproof structure of this utility model is that the material of the waterproof cover is polyurethane rubber.

[0013] The improved waterproof structure of the hydraulic rock drill is further characterized by an umbrella-shaped stepped structure at the outer end of the waterproof cover, with a protrusion in the middle of the umbrella-shaped stepped structure.

[0014] The improved waterproof structure of the hydraulic rock drill is further enhanced by the fact that the outer surface of the waterproof cover is provided with a wear-resistant ceramic coating.

[0015] The improved waterproof structure of the hydraulic rock drill is further enhanced by the fact that the surface of the buffer pad is provided with a pressure relief groove.

[0016] The improved waterproof structure of the hydraulic rock drill is further enhanced by the fact that the buffer pad is made of silicone and has a thickness of 2-3 mm.

[0017] The technical solution of this utility model has the following beneficial effects: This utility model discloses a waterproof structure for the hydraulic rock drill's front guide. Through the structural cooperation of the waterproof cover, buffer pad, and drill head housing, it prevents relative movement between the drill bit and the waterproof cover, avoiding the problem of increased gaps and weakened waterproofing effect due to wear. This further improves the overall structure's sealing, durability, and operational stability. When the rock drill is drilling upwards, the waterproof cover effectively prevents flushing water from entering the drill's interior, preventing internal parts from corroding due to contact with acidic flushing water. This enhances the rock drill's reliability and durability under harsh working conditions, reduces maintenance and replacement costs due to parts corrosion, and solves the technical problem of waterproofing failure in existing hydraulic rock drill head waterproof structures caused by relative movement between the drill bit and the waterproof cover. The waterproof cover of this utility model can be made of rubber or other materials with a certain degree of elasticity, utilizing its elasticity to directly fit onto the drill bit, completing the installation without disassembling the drill head. Compared with traditional waterproofing methods, this design saves a significant amount of manpower and resources, reduces maintenance costs, and improves construction efficiency. During rock drilling, the waterproof cover not only prevents flushing water from entering the rock drill's interior but also serves as a dustproof measure. Meanwhile, its structural design protects the front face of the rock drill head from damage by rock cuttings, further extending the service life of the equipment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a longitudinal sectional view of the waterproof structure of the hydraulic rock drill of this utility model; Figure 2 This is a schematic diagram of the waterproof cover of the hydraulic rock drill front waterproof structure of this utility model; Figure 3 This is a schematic diagram of the buffer pad of the front waterproof structure of the hydraulic rock drill of this utility model.

[0020] Explanation of icon numbers: 1-Bristle shank; 101-Flushing hole; 2-Waterproof cover; 201-Umbrella-shaped stepped structure; 202-Boss; 3-Buffer pad; 301-Pressure relief groove; 4-Water injection sleeve; 401-Water cavity; 402-Flushing channel; 403-Oil-gas seal; 404-Oil-gas passage; 5-Head seal; 6-Head housing; 601-Water injection port; 7-Holding sleeve; 8-First water seal; 9-Second water seal; 10-Rotation mechanism. Detailed Implementation

[0021] The technical solutions of the present utility model 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 utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0023] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly and specifically defined.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0026] like Figures 1-3As shown, this utility model proposes a front-end waterproof structure for a hydraulic rock drill. The drill bit 1 is driven and connected to the rotary mechanism 10 of the hydraulic rock drill. The front-end waterproof structure includes a water-filled sleeve 4, a gripping sleeve 7, a head housing 6, a waterproof cover 2, and a buffer pad 3, which are fitted onto the outer periphery of the drill bit 1. The head housing 6 is connected to the rotary mechanism 10 of the hydraulic rock drill. The gripping sleeve 7 and the water-filled sleeve 4 are installed inside the head housing 6. The gripping sleeve 7 is located between the rotary mechanism 10 of the hydraulic rock drill and the water-filled sleeve 4. The waterproof cover 2 is connected to the head housing 6, and the buffer pad 3 is installed between the waterproof cover 2 and the end face of the head housing 6.

[0027] Specifically, the drill bit 1 is provided with a spline that engages with the spline sleeve in the rotary mechanism 10, achieving a transmission connection with the rotary mechanism 10. An oil-gas channel 404 is also provided on the water injection sleeve 4, and oil-gas seals 403 are provided on both sides of the oil-gas channel 404. Further, a head seal 5 is provided inside the head housing 6, between the front mating surface of the water injection sleeve 4 and the front mating surface of the head housing 6, to prevent the intrusion of foreign objects such as dust. Preferably, the head seal 5 is a lip seal with an outward opening. When foreign objects from outside the rock drill enter the rock drill and act on the lip, the lip opens to provide a one-sided seal, and the pressure of the medium penetrating the head self-tightens to seal, improving the sealing performance of the mating surface.

[0028] Preferably, a washer is provided between the gripping sleeve 7 and the rotary mechanism 10 of the hydraulic rock drill. In this embodiment, the washer is a corrugated elastic washer, thereby compensating for the end face gap caused by vibration and preventing the gripping sleeve 7 from shifting due to vibration. The washer can be made of rubber material.

[0029] Preferably, the water injection sleeve 4 has a water cavity 401, which is connected to the flushing hole 101 of the drill bit 1. First water seals 8 are embedded at both ends of the water cavity 401. The water cavity 401 is an annular cavity surrounding the drill bit 1, and there are two water cavities 401: one connected to the flushing hole 101 of the drill bit 1, and the other connected to the water inlet 601 of the drill head housing 6. The two water cavities 401 are connected by a flushing channel 402. The stroke of the flushing hole 101 of the drill bit 1 is less than the length of the annular water cavity 401. The function of the first water seal 8 is to prevent the flushing water in the water cavity 401 from invading other parts of the rock drill and causing corrosion. In this embodiment, the first water seal 8 is a lip seal, with the sealing lips on both sides arranged opposite each other. It uses the pressure of the flushing water in the water cavity 401 to self-tighten, preventing the flushing water in the water cavity 401 from leaking out, thereby preventing the flushing water in the water cavity 401 from invading other parts of the rock drill and causing corrosion.

[0030] Preferably, the grip sleeve 7 is embedded with a second water seal 9 to prevent rinsing water from entering the rotary mechanism 10. In this embodiment, the second water seal is a lip seal with the lip facing outward to prevent rinsing water from the rinsing mechanism from entering the rotary mechanism 10.

[0031] Preferably, the inner diameter of the central hole of the waterproof cover 2 is smaller than the outer diameter of the rod end of the drill bit 1. The waterproof cover 2 and the drill bit 1 are installed with an interference fit. The interference fit part is provided with annular anti-slip grooves along the axial direction to prevent relative movement between the drill bit 1 and the waterproof cover 2. Compared with the traditional waterproof structure, this fitting method avoids the problem of increased gap and weakened waterproof effect due to wear. At the same time, the multiple sealing design, wear-resistant treatment of key components and the addition of anti-vibration structure further improve the sealing performance, durability and working stability of the overall structure.

[0032] Furthermore, the waterproof cover 2 has a certain degree of elasticity; preferably, the material of the waterproof cover 2 is polyurethane rubber. The Shore hardness of the outer surface of the umbrella-shaped stepped part of the waterproof cover 2 that contacts the gravel is 85±5, exhibiting high hardness and high wear resistance. The interference fit between the drill bit 1 and the waterproof cover 2 is mirror-polished to reduce scratches on the inner wall of the waterproof cover 2 during assembly. Simultaneously, extreme pressure lithium-based grease is applied to the mating surfaces to reduce wear caused by relative movement.

[0033] Preferably, such as Figure 2 As shown, the outer end of the waterproof cover 2 is an umbrella-shaped stepped structure 201, and a boss 202 is provided in the middle of the umbrella-shaped stepped structure 201. When the rock drill is drilling upwards, the flushing water will flow directly or along the drill rod to the front end of the waterproof cover 2 of the rock drill water injection sleeve 4 due to gravity. The boss 202 can guide the flushing water flowing along the umbrella-shaped stepped structure 201 to slide off the surface of the waterproof cover 2, thus guiding the flushing water and preventing it from entering the inside of the rock drill head.

[0034] Preferably, the outer surface of the waterproof cover 2 is provided with a wear-resistant ceramic coating, which can enhance the resistance to impact and wear and prevent medium and large-sized stones from damaging the rock drill head.

[0035] Preferably, such as Figure 3 As shown, the surface of the buffer pad 3 is provided with a pressure relief groove 301. When rock drilling is not in progress, the rear end face of the buffer pad 3 is in contact with the front end face of the head housing 6. The buffer pad 3 can prevent dust from entering the rock drill head and can also buffer the high-frequency vibration of the rock drill during operation, avoiding the formation of negative pressure on the contact surface due to vibration to adsorb dust, thereby achieving the dual function of waterproofing and dustproofing.

[0036] Preferably, the buffer pad 3 is made of silicone, and its thickness is between 2-3 mm. The Shore hardness of the buffer pad 3 is 50±5. The buffer pad 3 and the waterproof cover 2 are bonded and fixed with a high-strength silicone rubber adhesive. The rear end face of the waterproof cover 2 (the area where the buffer pad 3 is bonded) is sanded to remove surface oil, release agent, and oxide layer, and to increase surface roughness to enhance the adhesion of the adhesive. After sanding, the surface is wiped with anhydrous ethanol to ensure that there is no dust residue.

[0037] This utility model's hydraulic rock drill front waterproof structure, through the structural cooperation of the waterproof cover 2, buffer pad 3, and drill head housing 6, prevents relative movement between the drill bit 1 and the waterproof cover 2, avoiding the problem of increased gaps and weakened waterproofing effect due to wear; it further improves the overall structure's sealing performance, durability, and operational stability. When the rock drill is drilling upwards, the waterproof cover 2 effectively blocks flushing water from entering the rock drill's interior, preventing internal parts from corroding due to contact with acidic flushing water, improving the rock drill's reliability and durability under harsh working conditions, reducing maintenance and replacement costs due to parts corrosion, and solving the technical problem of waterproofing failure in existing hydraulic rock drill head waterproof structures caused by relative movement between the drill bit 1 and the waterproof cover 2. The waterproof cover 2 of this utility model can be made of rubber or other materials with a certain degree of elasticity, utilizing its elastic properties to directly fit onto the drill bit 1, completing the installation without disassembling the drill head. Compared with traditional waterproofing methods, this design saves a significant amount of manpower and resources, reduces maintenance costs, and improves construction efficiency. During rock drilling, the waterproof cover 2 not only prevents flushing water from entering the rock drill, but also acts as a dust barrier. Simultaneously, its structural design protects the front face of the rock drill head from damage by drilling debris, further extending the equipment's service life.

[0038] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A waterproof guide structure for a hydraulic rock drill, wherein the drill bit (1) is driven and connected to the rotary mechanism (10) of the hydraulic rock drill, characterized in that, The leading waterproof structure includes a water injection sleeve (4), a grip sleeve (7), a head housing (6), a waterproof cover (2), and a buffer pad (3) for being fitted onto the outer periphery of the drill bit (1); the head housing (6) is used to connect to the rotary mechanism (10) of the hydraulic rock drill, the grip sleeve (7) and the water injection sleeve (4) are installed inside the head housing (6), and the grip sleeve (7) is located between the rotary mechanism (10) of the hydraulic rock drill and the water injection sleeve (4); the waterproof cover (2) is connected to the head housing (6), and the buffer pad (3) is installed between the waterproof cover (2) and the end face of the head housing (6).

2. The waterproof structure of the hydraulic rock drill front as described in claim 1, characterized in that, A washer is provided between the holding sleeve (7) and the rotary mechanism (10) of the hydraulic rock drill.

3. The waterproof structure for the hydraulic rock drill front as described in claim 1, characterized in that, The water injection sleeve (4) is provided with a water cavity (401), which is connected to the flushing hole (101) of the rod tip (1). The two ends of the water cavity (401) are respectively fitted with a first water seal (8).

4. The waterproof structure of the hydraulic rock drill front as described in claim 1, characterized in that, The grip sleeve (7) is equipped with a second water seal (9).

5. The waterproof structure of the hydraulic rock drill front as described in claim 1, characterized in that, The inner diameter of the center hole of the waterproof cover (2) is smaller than the outer diameter of the rod end of the drill bit (1). The waterproof cover (2) and the drill bit (1) are installed with an interference fit. The interference fit part is provided with annular anti-slip texture along the axial direction.

6. The waterproof structure of the hydraulic rock drill front as described in claim 1, characterized in that, The waterproof cover (2) is made of polyurethane rubber.

7. The waterproof structure for the hydraulic rock drill front as described in claim 1, characterized in that, The outer end of the waterproof cover (2) is an umbrella-shaped stepped structure (201), and a boss (202) is provided in the middle of the umbrella-shaped stepped structure (201).

8. The waterproof structure of the hydraulic rock drill front as described in claim 1, characterized in that, The outer surface of the waterproof cover (2) is provided with a wear-resistant ceramic coating.

9. The waterproof structure for the hydraulic rock drill front as described in claim 1, characterized in that, The surface of the buffer pad (3) is provided with a pressure relief groove (301).

10. The waterproof structure of the hydraulic rock drill front as described in claim 1, characterized in that, The material of the buffer pad (3) is silicone, and the thickness of the buffer pad (3) is between 2-3 mm.

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