Rock drill sealing assembly and oil-free lubricating water seal rock drill

Abstract

The invention belongs to the technical field of rock drills, and relates to a rock drill sealing assembly and an oil-free lubricating water seal rock drill. Comprising an air inlet connector and a rapping mechanism, the rapping mechanism is provided with an inner cavity, the air inlet connector makes contact with the inner cavity, and the rapping mechanism does reciprocating motion and rotating motion; a water-free sealing structure is arranged between the inner cavity and the air inlet connector and comprises an elastic sealing ring, and supporting rings are arranged on the left side and the right side of the elastic sealing ring. According to the novel oil-free lubricating water seal rock drill, the air inlet connector is supported through the two supporting rings made of high molecular weight polyethylene materials, tension is provided through the U-shaped stainless steel spring in the elastic seal, the outer abrasion-resistant sealing ring is supported to continuously seal the contact face, it is guaranteed that steam does not leak out, and the service life is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of rock drills and relates to a rock drill sealing component and an oil-free lubricating water-sealed rock drill. Background Art

[0002] Hydraulic rock drills are mainly used in the taphole opening machine in front of the blast furnace iron-making yard. The hydraulic rock drill is a device that uses hydraulic oil to drive the piston to move in high-frequency reciprocating linear and rotational motion, driving the drill bit to achieve efficient drilling. When the hydraulic rock drill is working, it is necessary to continuously perform water vapor blowing inside the body to ensure continuous cooling inside the body and dust removal at the taphole; the water vapor blowing and dust removal function of the hydraulic rock drill must use a fixed channel inside the rock drill body and cannot flow to other parts, affecting the service life of the equipment.

[0003] Oil-lubricated water-sealed rock drill structure Figure 5 and Figure 6 As shown, the rock drill housing 1 is fixed, and the rapping mechanism 2 reciprocates at high frequency inside the copper sleeve 3. The inner and outer spline sleeves 4 are connected to the inner splines of the rapping mechanism 2 and the outer splines of the gear shaft 6, which play a role in common rotation. The rear portion 5 of the housing is connected to the rock drill housing 1 and the rear end cover 7 respectively through fasteners, forming a closed cavity. The end face of the air inlet connector 8 is connected to the rear end cover 7 through fasteners, and the long axis of the air inlet connector 8 is supported by the inner hole of the rear end cover 7. A U-shaped ring 9 is installed at one end of the air inlet connector 8, and the sealing surface of the U-shaped ring 9 contacts the inner cavity of the rapping mechanism 2 to form a waterproof surface.

[0004] When the oil-lubricated water-sealed rock drill is working, the vibration mechanism 2 and the air inlet connector 8 perform relative reciprocating high-frequency motion and relative rotational motion at the same time. An oil mist lubrication connector 11 is provided at the tail of the air inlet connector 8, and an elongated hole 12 is provided inside to connect to the U-shaped ring 9. There are three U-shaped sealing rings at the end of the air inlet connector 8. Water vapor continuously enters the inner hole channel of the vibration mechanism 2 through the air inlet connector 8 and is blown out from the drill bit, which can not only take away the heat of the rock drill body, but also cool the iron mouth with water and blow away the dust at the iron mouth. During the water vapor blowing process, the U-shaped ring 9 plays the role of sealing the water vapor to prevent it from entering other cavities of the rock drill. Figure 6 As shown in the enlarged view of Part I, the middle portion of the first U-shaped ring 9.1 and the second U-shaped ring 9.2 contains a channel for oil mist lubrication, while the third U-shaped ring 9.3 cannot. When the hydraulic rock drill is operating, atomized water must be continuously introduced into the internal channel. Due to the high-frequency movement of the inner cavity of the rapping mechanism 2 at the water-gas joint 8, some of the water in the inner cavity of the rapping mechanism 2 is reversed and impacted backwards on the third U-shaped ring 9.3. The first U-shaped ring 9.1, the second U-shaped ring 9.2, and the third U-shaped ring 9.3 work together to prevent the reverse flow of water vapor into the rear end cover 7.

[0005] However, the disadvantages of this prior art are as follows: like" Figure 6The enlarged diagram of the structure of the oil-lubricated water-sealed rock drill part I is shown in the following figure: Structural Machining Difficulties: The air inlet connector of this structure requires machining an elongated hole 12, which is not only difficult to manufacture but also prone to positioning deviation. Since the elongated hole is only 2mm away from the water-gas passage, drilling through the oil-mist lubrication channel and the water-gas passage is very likely during machining, causing water-gas and oil mixing, directly affecting normal operation of the equipment. Functional flaws: Although the structure utilizes three U-ring seals, this lacks effective support. The high-speed rotation and reciprocating motion of the rapping mechanism causes severe wear on the U-rings. Furthermore, U-ring 3 lacks oil mist lubrication, making it susceptible to damage. Once U-ring 3 is damaged, moisture can come into contact with the lubricant, altering the environmental medium and significantly shortening the equipment's service life. Poor economic efficiency: This structure requires the use of three U-rings to achieve the water seal function, and must be equipped with an oil mist lubrication system, resulting in poor overall economic efficiency. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide a rock drill sealing assembly and an oil-free lubricated water-sealed rock drill.

[0007] A rock drill sealing assembly includes an air inlet joint and a rapping mechanism, wherein the rapping mechanism is provided with an inner cavity, the air inlet joint contacts the inner cavity, and the rapping mechanism performs reciprocating motion and rotational motion; A waterless sealing structure is provided between the inner cavity and the air inlet joint. The waterless sealing structure comprises an elastic sealing ring. Support rings are provided on both the left and right sides of the elastic sealing ring.

[0008] Furthermore, the elastic sealing ring includes a lip sealing ring and a U-shaped spring, and the U-shaped spring is located on the inner wall of the sealing lip of the lip sealing ring.

[0009] Furthermore, a limiting protrusion is provided on the sealing lip of the lip-shaped sealing ring.

[0010] Furthermore, the support ring is made of high molecular weight polyethylene material.

[0011] Furthermore, the U-shaped spring is made of stainless steel.

[0012] Furthermore, the vibrating mechanism is provided with inner and outer spline sleeves on the outside, and a first external spline is provided on the outside of the vibrating mechanism, and the inner and outer spline sleeves are meshed with the first external spline; the outer part of the inner and outer spline sleeves is provided with a gear shaft, and a second external spline is provided on the gear shaft, and the inner and outer spline sleeves are meshed with the second external spline.

[0013] Furthermore, the gear shaft is driven by a motor.

[0014] Further, it includes the rock drill sealing assembly described in any one of the above items.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The new oil-free lubricated water seal rock drill air inlet joint eliminates the lubricating oil hole, which reduces processing difficulty and manufacturing cost.

[0016] 2. The new oil-free lubricated water-sealed rock drill supports the air inlet joint through two high molecular weight polyethylene support rings. The elastic seal uses the internal U-shaped stainless steel spring to provide tension, supporting the external wear-resistant sealing ring to continuously seal the contact surface, ensuring that water and gas do not leak out and extending the service life.

[0017] 3. The new oil-free lubricated water seal rock drill does not require oil lubrication water seal function. The support ring in the seal is not easy to wear. Only the sealing ring needs to be replaced. Compared with the three U-shaped sealing rings, the price is low and the economic effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are incorporated in and constitute a part of this specification and, together with the description, serve to explain the principles of the invention.

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 Schematic diagram of the structure of the oil-free lubricated water-sealed rock drill in the present invention; Figure 2 The oil-free lubricated water-sealed rock drill in the present invention A magnified schematic diagram of the part structure; Figure 3 This is an enlarged view of the support ring in the present invention; Figure 4 It is a partial enlarged view of the elastic sealing ring in the present invention; Figure 5 This is a structural diagram of an oil-lubricated water-sealed rock drill; Figure 6 For oil-lubricated water-sealed rock drills Enlarged schematic diagram of the part structure.

[0021] Among them: 1 is the rock drill housing; 2 is the vibration mechanism; 3 is the copper sleeve; 4 is the internal and external spline sleeve; 5 is the rear part of the housing; 6 is the gear shaft; 7 is the rear end cover; 8 is the air inlet joint; 9 is the U-shaped ring; 9.1 is the first U-shaped ring; 9.2 is the second U-shaped ring; 10 is the waterless sealing structure; 10.1 is the support ring; 10.2 is the elastic sealing ring; 10.2.1 is the lip sealing ring; 10.2.2 is the U-shaped spring; 11 is the oil mist lubrication joint; 12 is the elongated hole. DETAILED DESCRIPTION

[0022] Here, exemplary embodiments will be described in detail, and the embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are only examples consistent with some aspects of the present invention described in detail in the appended claims.

[0023] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. Example

[0024] A rock drill sealing assembly includes an air inlet joint 8 and a rapping mechanism 2, wherein the rapping mechanism 2 is provided with an inner cavity, the air inlet joint 8 is in contact with the inner cavity, and the rapping mechanism 2 performs reciprocating motion and rotational motion; A waterless sealing structure 10 is provided between the inner cavity and the air inlet connector 8. The waterless sealing structure 10 comprises an elastic sealing ring 10.2. Support rings 10.1 are provided on both the left and right sides of the elastic sealing ring 10.2.

[0025] Specifically, such as Figure 1 and Figure 2As shown, the rock drill housing 1 is fixed, and the rapping mechanism 2 is inside the copper sleeve 3. The gear shaft 6 is connected to the inner and outer spline sleeves 4 in the rear portion 5 of the housing. During operation, the air intake joint 8 continuously introduces water vapor to cool the machine body and purge the iron mouth. The air intake joint 8 is fixed by bolts and the rear end cover 7. One end of the shaft head of the air intake joint 8 is positioned by the inner hole of the rear end cover 7, and the other end is supported and positioned by a support ring 10.1. The support ring 10.1 also plays a guiding role. Since the air intake joint 8 is fixed, the outer spline part of the rapping mechanism 2 can move linearly and high-frequency in the inner spline of the inner and outer spline sleeves 4, performing the rapping action. The rear end cavity of the rapping mechanism 2 simultaneously enters the small shaft head end of the air intake joint 8, performing linear reciprocating motion. At the same time, the outer spline of the inner and outer spline sleeves 4 is connected to the gear shaft 6. The motor drives the gear 6 to drive the inner and outer spline sleeves 4 and the rapping mechanism 2 to rotate together, performing a rotational action. The new oil-free lubrication water-sealed rock drill can simultaneously perform rapping and rotational actions. The waterless seal 9 is installed at one end of the air inlet joint 8 and contacts the inner cavity of the rapping mechanism 2 through the elastic sealing ring 10.2, forming a waterproof surface to prevent water and gas leakage. When the new oil-free lubricated water-sealed rock drill is working, atomized water continuously enters the air inlet joint 8, enters the drill bit through the inner hole of the rapping mechanism 2, and is blown out to cool the machine body and purge the iron mouth. Figure 2 ), the waterless sealing structure 10 comprises a support ring 10.1 and a U-shaped spring 10.2.2. Two identical support rings 10.1 support one end of the air inlet connector 8. An elastic sealing ring 10.2 is positioned between the two support rings 10.1 to provide waterproofing. The elastic sealing ring 10.2 is an asymmetric sealing structure, consisting of a lip seal 10.2.1 and a corrosion-resistant U-shaped spring 10.2.2. Supported by the U-shaped spring 10.2.2, the lip seal 10.2.1 provides excellent sealing capabilities.

[0026] Furthermore, the elastic sealing ring 10.2 comprises a lip sealing ring 10.2.1 and a U-shaped spring 10.2.2. The U-shaped spring 10.2.2 is located on the inner wall of the sealing lip of the lip sealing ring 10.2.1. A limiting protrusion is provided on the sealing lip of the lip sealing ring 10.2.1.

[0027] Furthermore, if Figure 3 As shown, the support ring 10.1 is made of high molecular weight polyethylene material.

[0028] Specifically, the support ring 10.1 is a high molecular weight polyethylene material, which is fully suitable for hydraulic and pneumatic applications due to its excellent friction and wear properties.

[0029] Furthermore, the U-shaped spring 10.2.2 is made of stainless steel.

[0030] Specifically, such as Figure 4As shown, the U-shaped spring 10.2.2 is made of high-performance stainless steel, is suitable for media such as water and gas, and can provide various loads required by the lip seal 10.2.1.

[0031] Furthermore, the outside of the rapping mechanism 2 is provided with an inner and outer spline sleeve 4, and the outside of the rapping mechanism 2 is provided with a first external spline, and the inner and outer spline sleeve 4 is engaged with the first external spline; the outside of the inner and outer spline sleeve 4 is provided with a gear shaft 6, and the gear shaft 6 is provided with a second external spline, and the inner and outer spline sleeve 4 is engaged with the second external spline.

[0032] Furthermore, the gear shaft 6 is driven by a motor.

[0033] Specifically, the outer splines of the inner and outer spline sleeves 4 are connected to the gear shaft 6 , and the gear shaft 6 is driven by a motor to drive the inner and outer spline sleeves 4 and the rapping mechanism 2 to rotate together and perform a rotational action.

[0034] Further, it includes the rock drill sealing assembly described in any one of the above items.

[0035] Working principle: In the new oil-free lubricated water-seal rock drill, the tail inner cavity of the vibrating mechanism 2 enters the small shaft head end of the air inlet connector 8 and performs linear reciprocating motion; at the same time, the outer spline of the inner and outer spline sleeves 4 is connected to the gear shaft 6, and the gear shaft 6 is driven by the motor to drive the inner and outer spline sleeves 4 and the vibrating mechanism 2 to rotate together, performing a rotational motion. The new oil-free lubricated water-seal rock drill can perform vibrating and rotational motions at the same time. When the new oil-free lubricated water-seal rock drill is performing water-gas purging tasks, the oil-free lubricated water-seal rock drill no longer needs to use oil mist lubrication water seals before work because the air inlet connector 8 has eliminated the oil mist lubrication channel. The support ring 10.1 is a high molecular weight polyethylene material. Due to its excellent friction and wear properties, it is fully suitable for water pressure and pneumatic applications. Through the support and guiding effect of the two support rings 10.1 on the air inlet connector 8, the vibrating mechanism 2 can effectively reduce the friction with the elastic sealing ring 10.2 during high-speed rotation and reciprocating motion, avoiding the elastic sealing ring 10.2 from excessive wear and failure. The elastic sealing ring 10.2 is suitable for high-speed linear reciprocating and rotating environments, can seal under high-speed linear motion and rotational motion conditions, and can adapt to working temperatures up to 300°C. During the water vapor purge task, the lip sealing ring 10.2.1 contacts the inner cavity of the vibration mechanism 2, and after wear, it is continued to be supported by the U-shaped spring 10.2.2 to expand outward. The U-shaped spring 10.2.2 is made of high-performance stainless steel and is suitable for media such as water vapor. It can provide the various loads required by the lip sealing ring 10.2.1. The lip sealing ring 10.2.1 allows fluid pressure to be applied to the sealing lip, so that the entire sealing pressure will continue to rise with the increase in working pressure, compensating for the wear of the lip sealing ring 10.2.1 and achieving the effect of continuously sealing water vapor. Since the support ring 10.1 in the elastic seal is not easy to wear, only the sealing ring needs to be replaced, so it is highly economical.

[0036] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0037] It should be understood that the present invention is not limited to the above description and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A rock drill sealing assembly, characterized in that: It comprises an air inlet joint (8) and a rapping mechanism (2), wherein the rapping mechanism (2) is provided with an inner cavity, the air inlet joint (8) is in contact with the inner cavity, and the rapping mechanism (2) performs reciprocating motion and rotational motion; A waterless sealing structure (10) is provided between the inner cavity and the air inlet connector (8), the waterless sealing structure (10) comprising an elastic sealing ring (10.2), and support rings (10.1) are provided on both the left and right sides of the elastic sealing ring (10.2).

2. The rock drill sealing assembly according to claim 1, wherein: The elastic sealing ring (10.2) comprises a lip sealing ring (10.2.1) and a U-shaped spring (10.2.2), wherein the U-shaped spring (10.2.2) is located on the inner wall of the sealing lip of the lip sealing ring (10.2.1).

3. The rock drill sealing assembly according to claim 2, wherein: A limiting protrusion is provided on the sealing lip of the lip-shaped sealing ring (10.2.1).

4. The rock drill sealing assembly according to claim 2, wherein: The U-shaped spring (10.2.2) is made of stainless steel.

5. The rock drill sealing assembly according to claim 1, wherein: The support ring (10.1) is made of high molecular weight polyethylene material.

6. The rock drill sealing assembly according to claim 1, wherein: The rapping mechanism (2) is provided with an inner and outer spline sleeve (4) on the outside, a first outer spline is provided on the outside of the rapping mechanism (2), and the inner and outer spline sleeve (4) is meshed with the first outer spline; the inner and outer spline sleeve (4) is provided with a gear shaft (6) on the outside, a second outer spline is provided on the gear shaft (6), and the inner and outer spline sleeve (4) is meshed with the second outer spline.

7. The rock drill sealing assembly according to claim 6, wherein: The gear shaft (6) is driven by a motor.

8. An oil-free lubricated water-sealed rock drill, characterized in that: A rock drill sealing assembly comprising the rock drill sealing assembly according to any one of claims 1 to 7.

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