A mine tailings transfer pipe wear resistant joint having a graded wear layer

Abstract

The application relates to the technical field of pipeline joint, in particular to a mine tailing conveying pipe wear-resistant joint with a graded wear-resistant layer. A connecting end of the pipeline joint is movably provided with a butt joint sleeve, and the pipeline joint is arc-shaped in side view. The pipeline joint comprises a wear-resistant layer made of high-chromium cast iron material at the innermost part, a buffer layer between the surface layer and the base body, and a base body layer at the outer part. A stable butt joint mechanism is arranged in the butt joint sleeve and is used for improving the stability of the joint and the pipeline during butt joint. A shock absorption protection mechanism is arranged in the buffer layer and is used for improving the rigid strength of the butt joint part of the pipeline joint. The double locking structure is used for stably butt joining the pipeline, the spring and the air bag are cooperatively used for the shock absorption structure, the butt joint loose deviation problem is reduced, the conveying impact is weakened, and the pipeline stability and the service life of the joint are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of pipe joint technology, specifically to a wear-resistant joint for a mine tailings conveying pipe with a graded wear-resistant layer. Background Technology

[0002] Tailings transportation is a core supporting process in mining operations. Tailings media often contain hard particles such as sand and slag, exhibiting strong corrosiveness, high scouring force, and high impact during transportation. This places extremely high demands on the wear resistance, structural stability, and shock absorption performance of the transportation pipelines and connecting joints. As the core connecting component of the tailings transportation pipeline, the pipe joint directly affects the sealing, integrity, and service life of the entire pipeline, and is a key structure for ensuring continuous and stable tailings transportation. Currently, the conventional tailings transportation pipe joints on the market have relatively simple structural designs, mostly adopting single-layer wear-resistant structures or simple flange connections, which have many technical defects.

[0003] Firstly, traditional joints have rudimentary positioning structures, lacking precise positioning and stable contact during the connection process. This leads to issues like misalignment, loosening, and displacement when the pipe and joint are connected, resulting in poor stability. This necessitates repeated manual calibration, significantly increasing installation and commissioning difficulty and reducing overall pipeline installation efficiency. It also easily causes uneven joint gaps, leading to leakage and seepage during long-term tailings transport. Secondly, most existing joints lack targeted shock-absorbing and protective structures. The fluid impact and media vibration impact generated during high-speed tailings transport directly act on the joint connection. Under long-term alternating load impact, the joint connection is prone to structural loosening, deformation, and cracking, significantly shortening its service life and increasing pipeline maintenance costs. Furthermore, existing wear-resistant joints are mostly single-layer designs, lacking a graded buffer structure. The absence of a buffer transition structure between the wear-resistant layer and the base layer prevents effective mitigation of media impact loads, leading to wear layer detachment and excessive wear.

[0004] To address the aforementioned issues, innovative designs are urgently needed based on existing approaches. Summary of the Invention

[0005] The purpose of this invention is to provide a wear-resistant joint for mine tailings conveying pipes with a graded wear-resistant layer, so as to solve the problems mentioned in the background art. The technical solution of this invention provides a solution that is significantly different from the existing technology, which is too simplistic.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a wear-resistant joint for a mine tailings conveying pipe with a graded wear-resistant layer, comprising a pipe joint, wherein a butt sleeve is movably installed at the connecting end of the pipe joint, and the pipe joint is arc-shaped in side view; The pipe joint includes an innermost wear-resistant layer made of high-chromium cast iron, a buffer layer sandwiched between the outer layer and the substrate, and a substrate layer on the outside of the pipe joint. A stabilizing connection mechanism is provided in the connection sleeve, and the stabilizing connection mechanism is used to improve the stability of the joint when it is connected to the pipe. A shock-absorbing and protective mechanism is provided in the buffer layer and is used to improve the rigidity of the pipe joint connection.

[0007] Preferably, the stable docking mechanism includes abutment blocks, which are elastically and slidably installed in the docking sleeve, and four abutment blocks are arranged at equal angles with the docking sleeve as the center; The abutment block is trapezoidal in side view, the inclined surface of the abutment block faces the connection port, and the abutment block is arc-shaped in front view.

[0008] Preferably, a pressure spring is connected to the upper end of the abutment block, and the upper end of the pressure spring is installed at the bottom end of the compression block; The extrusion block is elastically limited and slidably installed inside the docking sleeve, and the extrusion block is trapezoidal in side view.

[0009] Preferably, a movable block is elastically and slidably installed at the right end of the docking sleeve, and a moving strip is abutted against the front end of the movable block. The moving strip is slidably installed inside the docking sleeve. The movable bar is shaped like an inverted right trapezoid in side view, and the inclined surface of the movable bar abuts against the upper end of the movable block.

[0010] Preferably, the surface of the pipe joint is provided with a sliding groove at equal angles, and the side walls of the sliding groove are provided with track grooves. The sliding groove is inclined forward and upward when viewed from the side, and the movable block is slidably installed in the track groove.

[0011] Preferably, the stable docking mechanism further includes a limiting block, which is elastically slidably installed in the docking sleeve, and the sliding position of the limiting block corresponds to the circular hole opened on the back of the movable block.

[0012] Preferably, the shock absorption and protection mechanism includes a shock absorption plate, which is disposed in a buffer layer inside the pipe joint. Shock absorption springs are evenly distributed on the shock absorption plate, and an arc-shaped plate is connected to the upper end of each shock absorption spring.

[0013] Preferably, four arc-shaped plates are arranged at equal angles with the shock-absorbing plate as the center. The arc-shaped plates are slidably installed in the inner buffer layer at the front end of the pipe joint, and a shock-absorbing airbag is installed at the upper end of the arc-shaped plates.

[0014] Preferably, the shock absorption and protection mechanism further includes a piston cylinder, which is installed in a sliding groove; The piston rod on the piston cylinder slides against the groove at the front end of the movable block. A return spring surrounds the outside of the piston rod. The piston cylinder is connected to the shock-absorbing airbag through an air supply hose.

[0015] Preferably, an abutment plate is provided on the movement trajectory of the piston rod, the abutment plate is inverted "L" shape when viewed from the side, and a support block is fixedly installed at the lower end of the abutment plate; The support block is an isosceles trapezoid in side view and is located between the shock-absorbing plate and the arc-shaped plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. A dedicated and stable docking mechanism significantly improves the stability of joint docking and the efficiency of pipeline fixing installation. Four sets of trapezoidal arc-shaped abutment blocks are set at equal angles within the docking sleeve, forming an elastic abutment positioning structure in conjunction with pressure springs and extrusion blocks. During pipeline docking, the abutment blocks can automatically align and correct themselves by adaptively fitting the pipe docking end with their inclined surfaces, effectively preventing misalignment and offset issues and initially ensuring docking accuracy. Simultaneously, the limited sliding cooperation between the movable blocks, moving strips, and the inclined sliding grooves and track grooves of the pipeline joint, combined with elastic limit blocks, forms a double locking structure, enabling precise positioning and fixing after docking, reducing loosening and movement of the joint and pipeline after docking. This combination of adaptive positioning and mechanical locking reduces repeated manual calibration, simplifies the docking installation process, significantly improves the overall installation efficiency of pipeline docking and fixing, and greatly enhances the stability of pipeline operation and installation. 2. The pipe joint features a three-tiered structure: a base layer, a buffer layer, and a high-chromium cast iron wear-resistant layer. The buffer layer acts as a transitional structure, effectively bearing and mitigating the impact load of the medium, reducing the risk of the wear-resistant layer detaching or wearing off due to direct exposure to high-intensity impacts. Simultaneously, the buffer layer incorporates a multi-stage damping structure consisting of damping plates, damping springs, and arc-shaped plates. This absorbs the fluid impact and mechanical vibration generated during high-speed tailings transport, weakening the impact load from within the joint and effectively enhancing the overall rigidity and strength of the joint connection, extending its service life. Furthermore, a damping airbag is fitted to the upper end of the arc-shaped plate. During connection, the airbag receives the compressed gas from inside the piston cylinder via a gas delivery hose, expanding to fill the gaps within the buffer layer and improving the overall structural compactness. The damping airbag also expands adaptively when heated, further enhancing the structural stability of the connection. The expanded airbag significantly increases its damping stroke and load-bearing capacity, creating a synergistic damping effect with the damping springs and damping plates. This dynamically adapts to high-temperature, high-impact transport conditions, offering superior damping performance and greater adaptability compared to traditional fixed damping structures. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the mating sleeve of the present invention; Figure 3 This is a schematic cross-sectional view of the mating sleeve structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 This is a schematic diagram of the connection structure between the pipe joint and the movable block of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point B; Figure 7 This is a schematic diagram of the three-dimensional structure of the abutment block of the present invention; Figure 8 This is a schematic cross-sectional view of the pipe joint structure of the present invention; Figure 9 This is a schematic diagram of the connection structure between the shock-absorbing plate and the arc-shaped plate of the present invention.

[0018] In the diagram: 1. Pipe joint; 2. Butt sleeve; 3. Abutment block; 4. Pressure spring; 5. Extrusion block; 6. Movable block; 7. Moving strip; 8. Sliding groove; 9. Track groove; 10. Limiting block; 11. Shock-absorbing plate; 12. Shock-absorbing spring; 13. Arc plate; 14. Shock-absorbing airbag; 15. Piston cylinder; 16. Piston rod; 17. Return spring; 18. Abutment plate; 19. Support block. Detailed Implementation

[0019] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0020] Please see Figures 1-9 The present invention provides a technical solution: a wear-resistant joint for a mine tailings conveying pipe with a graded wear-resistant layer, including a pipe joint 1, a connecting sleeve 2 movably installed at the connecting end of the pipe joint 1, and the pipe joint 1 is arc-shaped when viewed from the side. Pipe joint 1 includes an innermost wear-resistant layer made of high-chromium cast iron, pipe joint 1, a buffer layer sandwiched between the surface layer and the substrate, and a substrate layer on the outside of pipe joint 1. A stabilizing connection mechanism is installed in the connection sleeve 2. The stabilizing connection mechanism is used to improve the stability of the joint when it is connected to the pipeline. The vibration damping and protection mechanism is installed in the buffer layer and is used to improve the rigidity of the joint of pipe joint 1.

[0021] As one embodiment of the present invention, the stable docking mechanism includes an abutment block 3, which is elastically and slidably installed in the docking sleeve 2, and four abutment blocks 3 are arranged at equal angles with the docking sleeve 2 as the center. The abutment block 3 is trapezoidal when viewed from the side, and its inclined surface faces the connection port. When viewed from the front, the abutment block 3 is arc-shaped.

[0022] In one embodiment of the present invention, a pressure spring 4 is connected to the upper end of the abutment block 3, and the upper end of the pressure spring 4 is installed at the bottom end of the compression block 5. The extrusion block 5 is elastically limited and slidably installed inside the docking sleeve 2. The extrusion block 5 is trapezoidal in side view.

[0023] As one embodiment of the present invention, a movable block 6 is elastically and slidably installed on the right end of the docking sleeve 2, and a moving strip 7 is abutted against the front end of the movable block 6. The moving strip 7 is slidably installed inside the docking sleeve 2. The movable bar 7 is shaped like an inverted right trapezoid when viewed from the side, and the inclined surface of the movable bar 7 abuts against the upper end of the movable block 6.

[0024] In one embodiment of the present invention, the surface of the pipe joint 1 is provided with a sliding groove 8 at equal angles, and the side walls of the sliding groove 8 are provided with track grooves 9. The sliding groove 8 is inclined forward and upward when viewed from the side, and the movable block 6 is slidably installed in the track groove 9.

[0025] As one embodiment of the present invention, the stable docking mechanism further includes a limiting block 10, which is elastically slidably installed in the docking sleeve 2, and the sliding position of the limiting block 10 corresponds to the circular hole opened on the back of the movable block 6.

[0026] In its specific implementation, the mechanism consists of four sets of abutment blocks 3, pressure springs 4, and extrusion blocks 5 arranged in a ring at equal angles inside the docking sleeve 2 to form an elastic abutment assembly. The trapezoidal inclined surface of the abutment block 3 is used to achieve self-correction of the pipeline docking. The elastic extension and contraction of the pressure spring 4 ensures that the abutment block 3 always fits against the outer wall of the pipeline, completing the initial alignment. During the sliding process of the docking sleeve 2, the right-end movable block 6 slides along the inclined sliding groove 8 and track groove 9 of the pipeline joint 1, and the inclined surface transmission of the right-angled trapezoidal moving bar 7 achieves smooth displacement. When the movable block 6 slides to the preset position, the elastic limiting block 10 inside the docking sleeve 2 is engaged with the round hole on the back of the movable block 6 to form a mechanical lock. This dual structure of elastic pre-positioning and mechanical locking effectively reduces pipeline docking offset and loosening problems, simplifies the installation process, and greatly improves the docking accuracy and overall stability of the tailings conveying pipeline.

[0027] As one embodiment of the present invention, the shock absorption and protection mechanism includes a shock absorption plate 11, which is disposed in a buffer layer inside the pipe joint 1. Shock absorption springs 12 are disposed at equal intervals on the shock absorption plate 11, and an arc-shaped plate 13 is connected to the upper end of the shock absorption springs 12.

[0028] As one embodiment of the present invention, four arc-shaped plates 13 are arranged at equal angles with the shock-absorbing plate 11 as the center. The arc-shaped plates 13 are slidably installed in the inner buffer layer at the front end of the pipe joint 1. A shock-absorbing airbag 14 is installed at the upper end of the arc-shaped plates 13.

[0029] As one embodiment of the present invention, the shock absorption and protection mechanism further includes a piston cylinder 15, which is installed in the sliding groove 8; The piston rod 16 on the piston cylinder 15 slides against the groove at the front end of the movable block 6. A return spring 17 surrounds the outside of the piston rod 16. The piston cylinder 15 is connected to the shock-absorbing airbag 14 through the air supply hose.

[0030] As one embodiment of the present invention, an abutment plate 18 is provided on the movement trajectory of the piston rod 16. The abutment plate 18 is inverted "L" shape when viewed from the side, and a support block 19 is fixedly installed at the lower end of the abutment plate 18. The support block 19 is an isosceles trapezoid in side view and is located between the damping plate 11 and the arc plate 13.

[0031] A basic shock absorption system is formed by supporting four sets of annularly arranged arc-shaped plates 13 with multiple sets of shock-absorbing springs 12. The springs can absorb the fluid impact and mechanical vibration loads of tailings transportation through spring extension and contraction. When the pipeline is docked and locked, the movable block 6 squeezes the piston rod 16 of the piston cylinder 15, compressing the return spring 17 to generate compressed gas. The compressed gas is then inflated through the gas delivery hose to the shock-absorbing airbag 14, filling the gap of the buffer layer. It is supported by the abutment plate 18 and the support block 19. In the non-docked state, the spring pressure can be released to maintain a relaxed state, effectively protecting the shock absorption structure and improving durability.

[0032] Working principle: During the docking operation, four trapezoidal arc-shaped abutment blocks 3, arranged at equal angles around the center of the circle inside the docking sleeve 2, can adaptively fit the end of the pipe to be docked by relying on the inclined surface facing the pipe connection port, realizing automatic alignment and correction, and eliminating docking offset and misalignment problems; the top of the abutment block 3 is connected to the pressure spring 4, and the top of the pressure spring 4 is assembled at the bottom of the trapezoidal extrusion block 5. The extrusion block 5 is elastically limited and slidably installed inside the docking sleeve 2. Through the elastic expansion and contraction of the pressure spring 4, the abutment block 3 is always in contact with the outer wall of the pipe, realizing elastic abutment positioning, initially ensuring docking accuracy, and eliminating the need for repeated manual calibration.

[0033] After initial alignment, the mechanical locking and reinforcement process begins. Workers slide the docking sleeve 2 relative to the pipe joint 1. The movable block 6 at the right end of the docking sleeve 2 moves with the displacement, its front end abutting against the inclined surface of the inverted right-angled trapezoidal moving strip 7. Through the inclined surface compression transmission, the moving strip 7 is pushed to slide within the docking sleeve 2. Simultaneously, a forward- and upward inclined sliding groove 8 is formed on the surface of the pipe joint 1 at equal angles. The track grooves 9 on both sides of the sliding groove 8 provide limiting guidance for the movable block 6, allowing it to slide smoothly along the track grooves 9, adapting to the inclined docking trajectory. When the movable block 6 slides to the designated locking position, the elastically sliding limiting block 10 inside the docking sleeve 2 precisely engages with the round hole on the back of the movable block 6, forming a mechanical limiting lock. Combined with the initial elastic abutment positioning, this constitutes a double locking structure, reducing the problem of loosening and shifting after the pipe and joint are connected, improving installation efficiency and pipeline connection stability. During the operation phase, the damping plate 11, damping spring 12, and arc plate 13 inside the buffer layer constitute a basic multi-level damping structure. The damping spring 12, which is equidistantly arranged on the damping plate 11, supports the four arc plates 13 set at equal angles at the upper end. When the fluid impact force and medium vibration force generated by the high-speed transport of tailings are transmitted to the inside of the joint, the damping spring 12 is compressed by the arc plate 13, and the impact load is absorbed by the spring's expansion and contraction deformation, effectively strengthening the overall rigidity of the joint connection.

[0034] During the synchronous process of pipeline docking and locking, the shock-absorbing airbag 14 completes its inflation and pre-tightening. When the movable block 6 slides and locks, its front groove abuts against the piston rod 16 of the piston cylinder 15, pushing the piston rod 16 to compress the return spring 17, causing compressed gas to be generated inside the piston cylinder 15. The gas is transported through the gas delivery hose to the shock-absorbing airbag 14 at the upper end of the arc plate 13, causing the shock-absorbing airbag 14 to expand and fill the gap inside the buffer layer. The residual heat generated during the tailings transportation process will cause the shock-absorbing airbag 14 to expand adaptively a second time, further compacting the internal structure of the buffer layer and improving the stability of the docking connection. At the same time, the expanded shock-absorbing airbag 14 can form a synergistic shock absorption effect with the shock-absorbing spring 12 and the shock-absorbing plate 11, dynamically adapting to the complex transportation conditions of high temperature and high impact.

[0035] Among them, an inverted "L"-shaped abutment plate 18 is fixedly assembled on the movement trajectory of the piston rod 16. The isosceles trapezoidal support block 19 at the bottom end of the abutment plate 18 is arranged between the damping plate 11 and the arc plate 13, which can form auxiliary support for the damping structure. When the pipe joint 1 is not connected, the arc plate 13 and the damping plate 11 on the damping mechanism will not squeeze the damping spring 12, so that the damping spring 12 is kept in a relaxed state, effectively extending the service life of the damping protection mechanism and reducing the pipeline operation and maintenance cost.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A wear-resistant joint for a mine tailings conveying pipe with a graded wear-resistant layer, comprising a pipe joint (1), characterized in that: The pipe joint (1) is movably fitted with a mating sleeve (2) at its connecting end, and the pipe joint (1) is arc-shaped when viewed from the side. The pipe joint (1) includes an innermost wear-resistant layer made of high-chromium cast iron. The pipe joint (1) is sandwiched between the surface layer and the substrate as a buffer layer. The outer part of the pipe joint (1) is the substrate layer. A stabilizing docking mechanism is provided in the docking sleeve (2) and is used to improve the stability of the joint when it is connected to the pipe. The shock-absorbing and protective mechanism is set in the buffer layer and is used to improve the rigidity of the joint of the pipe joint (1).

2. The wear-resistant joint for a mine tailings conveying pipe with a graded wear-resistant layer according to claim 1, characterized in that: The stable docking mechanism includes abutment blocks (3), which are elastically limited and slidably installed in the docking sleeve (2). Four abutment blocks (3) are arranged at equal angles with the docking sleeve (2) as the center. The abutment block (3) is trapezoidal in side view, the inclined surface of the abutment block (3) faces the connection port, and the abutment block (3) is arc-shaped in front view.

3. The wear-resistant joint for a mine tailings conveying pipe with a graded wear-resistant layer according to claim 2, characterized in that: The upper end of the abutment block (3) is connected to a pressure spring (4), and the upper end of the pressure spring (4) is installed at the bottom end of the compression block (5). The extrusion block (5) is elastically limited and slidably installed inside the docking sleeve (2), and the extrusion block (5) is trapezoidal in side view.

4. The wear-resistant joint for a mine tailings conveying pipe with a graded wear-resistant layer according to claim 3, characterized in that: The right end of the docking sleeve (2) is elastically limited and slidably installed with a movable block (6), the front end of the movable block (6) abuts against a moving strip (7), and the moving strip (7) is slidably installed inside the docking sleeve (2). The movable bar (7) is in the shape of an inverted right trapezoid when viewed from the side, and the inclined surface of the movable bar (7) abuts against the upper end of the movable block (6).

5. The wear-resistant joint for a mine tailings conveying pipe with a graded wear-resistant layer according to claim 4, characterized in that: The surface of the pipe joint (1) is provided with a sliding groove (8) at equal angles. The side walls of the sliding groove (8) are provided with track grooves (9). The sliding groove (8) is tilted forward and upward when viewed from the side. The movable block (6) is slidably installed in the track groove (9).

6. The wear-resistant joint for a mine tailings conveying pipe with a graded wear-resistant layer according to claim 5, characterized in that: The stable docking mechanism also includes a limiting block (10), which is elastically slidably installed in the docking sleeve (2). The sliding position of the limiting block (10) corresponds to the circular hole opened on the back of the movable block (6).

7. The wear-resistant joint for a mine tailings conveying pipe with a graded wear-resistant layer according to claim 6, characterized in that: The shock absorption and protection mechanism includes a shock absorber plate (11), which is set in a buffer layer inside the pipe joint (1). Shock absorber springs (12) are arranged at equal intervals on the shock absorber plate (11), and an arc plate (13) is connected to the upper end of the shock absorber spring (12).

8. The wear-resistant joint for a mine tailings conveying pipe with a graded wear-resistant layer according to claim 7, characterized in that: The arc plate (13) is arranged at equal angles with the shock-absorbing plate (11) as the center. The arc plate (13) is slidably installed in the buffer layer inside the front end of the pipe joint (1). The upper end of the arc plate (13) is equipped with a shock-absorbing airbag (14).

9. The wear-resistant joint for a mine tailings conveying pipe with a graded wear-resistant layer according to claim 8, characterized in that: The shock absorption and protection mechanism also includes a piston cylinder (15), which is installed in a sliding groove (8); The piston rod (16) on the piston cylinder (15) slides against the groove at the front end of the movable block (6). A return spring (17) surrounds the outside of the piston rod (16). The piston cylinder (15) is connected to the shock-absorbing airbag (14) through the air supply hose.

10. The wear-resistant joint for a mine tailings conveying pipe with a graded wear-resistant layer according to claim 9, characterized in that: An abutment plate (18) is provided on the movement trajectory of the piston rod (16). The abutment plate (18) is inverted "L" shape when viewed from the side. A support block (19) is fixedly installed at the lower end of the abutment plate (18). The support block (19) is an isosceles trapezoid in side view and is located between the damping plate (11) and the arc plate (13).

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