A mud pipe assembly for horizontal directional drilling rig

Abstract

The present invention discloses a mud pipe assembly for a horizontal directional drilling rig, which belongs to the technical field of pipe joints. A transition pipe is provided at the right end of the flange, and a positioning boss is provided at the right end of the transition pipe; the left end of the horizontal pipe is inserted into the positioning boss; an arc-shaped welding boss with an arc-shaped surface is provided at one end of the connecting joint, and the inner side of the arc-shaped welding boss has an anti-wear inner cylindrical tube integrated with the connecting joint; a sealing plate is welded at both ends of the vertical pipe, and the inner side of the sealing plate has a plurality of fan-shaped reinforcing ribs evenly distributed around the center of the sealing plate. The flange and the positioning boss of the present invention are formed into one body with a transition pipe, which avoids the flange surface being affected by welding thermal deformation during welding and solves the hidden danger of mud leakage; the anti-wear inner cylindrical tube of the connecting joint is inserted into five distribution holes, which has the effect of preventing the granular substances in the mud from wearing the inner wall of the weld, and the sealing plate is provided with evenly distributed anti-wear reinforcing ribs, which also play an anti-wear role on the weld and avoids weld cracking after long-term work.

Description

Technical Field

[0001] The invention relates to the technical field of pipe joints, in particular to a mud pipe assembly of a horizontal directional drilling rig. Background Art

[0002] In the engineering machinery industry, mud pipes are currently commonly used in horizontal directional drilling. Due to the large amount of acidic substances and hard granular media in the mud during use, different degrees of wear will occur on the inner wall and welds of the pipe. At the same time, there are certain requirements for the verticality and flatness of the installation position of the flange surface connected to the mud system joint, otherwise it will form a poor seal, causing leakage of mud in the pipeline and pollution. Therefore, it is very important to prevent wear and limit the connection flange surface when designing the mud pipe assembly.

[0003] A Chinese patent discloses a dredging mud pipe for water conservancy projects (CN214093534U), which includes a mud pipe, a corrugated pipe sleeved on the outer wall of the mud pipe, and a sleeve that is telescopic along the axial direction of the mud pipe. The two ends of the corrugated pipe are respectively provided with clamps for clamping the corrugated pipe to the mud pipe, and the clamp is provided with a mounting groove for fixing the sleeve. The sleeve on the clamp includes a sleeve and a plug rod that is respectively threadedly connected to the two ends of the sleeve, so that the telescopic length of the overall mud pipe can be adjusted at a fixed distance.

[0004] The problems existing in the prior art are:

[0005] 1. The entire implementation process of a sludge pipe for desilting in water conservancy projects is only a single-channel conveying of sludge, and the flange is directly welded to the pipeline. The flange surface is easily deformed due to the influence of welding heat, which will affect the sealing problem with the sludge system after assembly, affecting the assembly and sealing quality;

[0006] 2. The pipe joints of the traditional mud pipe assembly for conveying mud are directly welded between the hollow structure and the arc structure matching the outer diameter of the pipe and the pipe hole. During use, there are more acidic substances and hard granular media in the mud, which will cause varying degrees of wear on the inner wall and weld of the pipe, making leakage problems prone to occur. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides a mud pipe assembly for a horizontal directional drilling rig.

[0008] The present invention is achieved through the following technical solutions: a mud pipe assembly of a horizontal directional drilling rig, wherein the right end of the flange is provided with a transition pipe, and the right end of the transition pipe is provided with a positioning boss with a positioning hole; the left end of the horizontal pipe is inserted into the positioning hole of the positioning boss, and the left end of the horizontal pipe is welded to the positioning boss; a vertical pipe is fixed to the right end of the horizontal pipe, and a row of distribution holes is provided on the vertical pipe; an arc-shaped welding boss with an arc-shaped surface is provided at one end of the connecting joint, and the inner side of the arc-shaped welding boss is provided with an anti-wear inner cylindrical tube which is integrated with the connecting joint; the anti-wear inner cylindrical tube is inserted into the distribution hole of the vertical pipe, and the anti-wear inner cylindrical tube cooperates with the distribution hole with a small gap, and the arc-shaped welding boss is adhered to the surface of the vertical pipe and welded to be integrated; two sealing plates are respectively welded to the two ends of the vertical pipe, and the inner side of the sealing plate is provided with a plurality of fan-shaped reinforcing rib plates evenly distributed around the center of the sealing plate, and the fan-shaped reinforcing rib plates are adhered to the inner wall of the vertical pipe; a limiting bracket is fixed under the vertical pipe, and a support plate is provided between the upper end of the limiting bracket and the vertical pipe.

[0009] Furthermore, the flange is provided with evenly distributed connection holes and adjustment elliptical holes; the flange, transition pipe and positioning boss are integrally formed by forging; and the transition pipe has the same diameter as the transverse pipe.

[0010] The left end face of the horizontal pipe is a plane, and the right end face of the horizontal pipe is milled with an arc surface. The arc surface of the horizontal pipe is attached to the surface of the vertical pipe and welded to form a whole.

[0011] The end of the connecting joint away from the vertical pipe has a 24° inner cone structure and an outer thread.

[0012] The lower end of the limit bracket is provided with a positioning flange plate, on which a long elliptical hole is opened, and the limit bracket and the positioning flange plate are forged as one piece; the limit bracket is a square tube, and the upper end face of the limit bracket is milled with an arc surface, and the arc surface of the limit bracket is attached to the surface of the vertical pipe and welded together as a whole.

[0013] The support plate is welded to the side of the limiting bracket, the support plate is in a 7-shape, the upper end surface of the support plate is milled with an arc surface, and the arc surface of the support plate is attached to the surface of the vertical pipe and welded to be integrated.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The flange and the positioning boss are integrated with a transition pipe, which is an integral forged part, avoiding the flange surface from being affected by welding thermal deformation during welding, ensuring that there is no flash seam on the surface when the flange is connected to the rotating joint of the horizontal directional drilling rig body, and solving the hidden danger of mud leakage;

[0016] 2. The arc-shaped welding boss on one side of the connecting joint is tangent to and welded with the vertical pipe. The anti-wear inner cylindrical tube is inserted into the five distribution holes. The outer diameter of the anti-wear inner cylindrical tube and the inner diameter of the distribution hole are matched with a small gap, which has the effect of preventing the granular substances in the mud from wearing the inner wall of the weld and avoiding the problem of welding cracking after long-term work;

[0017] 3. The sealing plate is equipped with evenly distributed anti-wear reinforcing ribs, which play an anti-wear role on the weld of the assembly during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of the structure of the present invention;

[0019] Figure 2 It is a left view of the structure of the present invention;

[0020] Figure 3 It is a top view of the structure of the present invention;

[0021] Figure 4 It is the main view of the flange structure;

[0022] Figure 5 This is the left view of the flange structure;

[0023] Figure 6 It is the main view of the horizontal pipe structure;

[0024] Figure 7 It is the main view of the vertical pipeline structure;

[0025] Figure 8 It is the main view of the connection joint structure;

[0026] Fig. 9 It is the main view of the sealing plate structure;

[0027] Fig.10 It is a bottom view of the sealing plate structure;

[0028] Fig.11 It is the main view of the limit bracket structure;

[0029] Fig.12 It is a bottom view of the limit bracket structure;

[0030] Fig.13 It is the main view of the supporting plate structure;

[0031] Fig.14 It is the left view of the support plate structure;

[0032] In the figure: 1. Flange; 1-1. Transition pipe; 1-2. Positioning boss; 1-3. Connection hole; 1-4. Adjustment elliptical hole; 2. Horizontal pipe; 3. Vertical pipe; 3-1. Distribution hole; 4. Connecting joint; 4-1. Arc welding boss; 4-2. Wear-resistant inner cylinder; 4-3. 24︒ inner cone structure; 4-4. External thread; 5. Closing plate; 5-1. Fan-shaped reinforcing rib plate; 6. Limit bracket; 6-1. Positioning flange plate; 6-2. Long elliptical hole; 7. Support plate. DETAILED DESCRIPTION

[0033] The following is a specific embodiment of the present invention, and the present invention will be further described in conjunction with the accompanying drawings.

[0034] Combination Figures 1 to 3 As shown, a horizontal directional drilling rig mud pipe assembly includes a flange 1, a horizontal pipe 2, a vertical pipe 3, a connecting joint 4, a sealing plate 5 and a limiting bracket 6.

[0035] Recombination Figure 4 and Figure 5 As shown, the right end of the flange 1 has a transition pipe 1-1, the right end of the transition pipe 1-1 has a positioning boss 1-2, and a positioning hole is opened in the positioning boss 1-2. The flange 1, the transition pipe 1-1 and the positioning boss 1-2 are forged into one piece. The flange 1 is provided with evenly distributed connection holes 1-3 and adjustment elliptical holes 1-4.

[0036] Recombination Figure 6 As shown, the left end face of the horizontal pipe 2 is a plane, and the right end face of the horizontal pipe 2 is milled with an arc surface. The left end of the horizontal pipe 2 is inserted into the positioning hole of the positioning boss 1-2, and the left end of the horizontal pipe 2 is welded to the positioning boss 1-2. The diameter of the horizontal pipe 2 and the transition pipe 1-1 are the same. The arc surface of the right end of the horizontal pipe 2 is attached to the surface of the vertical pipe 3 and welded to form a whole.

[0037] Recombination Figure 7 As shown, both ends of the vertical pipe 3 are open, one side of the vertical pipe 3 is provided with a through hole for connecting with the horizontal pipe 2, and the other side is provided with five distribution holes 3-1 arranged in a row, and the distribution holes 3-1 are used to connect with the connecting joint 4.

[0038] Recombination Figure 8 As shown, one end of the connection joint 4 has a 24︒ inner cone structure 4-3 and an outer thread 4-4, and the other end is provided with an arc-shaped welding boss 4-1 with an arc surface. The inner side of the arc-shaped welding boss 4-1 has a wear-resistant inner cylindrical tube 4-2 which is integrated with the connection joint 4. The wear-resistant inner cylindrical tube 4-2 is inserted into the distribution hole 3-1 of the vertical pipe 3, and the wear-resistant inner cylindrical tube 4-2 and the distribution hole 3-1 are matched with a small gap. The arc-shaped welding boss 4-1 is attached to the surface of the vertical pipe 3 and welded to form a whole.

[0039] Recombination Fig. 9 and Fig.10 As shown, two sealing plates 5 are welded to the two ends of the vertical pipe 3 respectively, and the inner side of the sealing plate 5 has a plurality of fan-shaped reinforcing ribs 5 - 1 evenly distributed around the center of the sealing plate 5 , and the fan-shaped reinforcing ribs 5 - 1 are in contact with the inner wall of the vertical pipe 3 .

[0040] Recombination Fig.11 and Fig.12 As shown, the limit bracket 6 is a square tube, and the lower end of the limit bracket 6 has a positioning flange plate 6-1, and the positioning flange plate 6-1 is provided with an oblong hole 6-2. The limit bracket 6 and the positioning flange plate 6-1 are forged into one piece. The upper end face of the limit bracket 6 is milled with an arc surface, and the arc surface of the limit bracket 6 is attached to the surface of the vertical pipe 3 and welded to form a whole.

[0041] Recombination Fig.13 and Fig.14 As shown, two support plates 7 are provided, and the two support plates 7 are symmetrically distributed on both sides of the limiting bracket 6. The support plate 7 is in a 7-shape, and a circular arc surface is milled on the upper end surface of the support plate 7. The support plate 7 is welded to the side of the limiting bracket 6, and the circular arc surface at the upper end is attached to the surface of the vertical pipe 3 and welded to form a whole.

[0042] The specific implementation is as follows:

[0043] First, the horizontal pipe 2 is inserted into the positioning hole of the positioning boss 1-2 for welding, wherein the outer cylindrical diameter of the transition pipe 1-1 at the left end of the positioning boss 1-2 and the flange is the same as that of the horizontal pipe 2 and is integrated with the flange. This structure can avoid the traditional mud pipe horizontal pipe being directly inserted into the flange hole for welding, resulting in the phenomenon of flange thermal deformation, and solves the problem of easy leakage of the flange surface seal;

[0044] Secondly, the flange 1, the horizontal pipe 2 and the vertical pipe 3 which have been welded are welded, and the connecting joint 4 with the anti-wear inner cylindrical tube 4-2 with the weld to prevent mud wear is respectively inserted into the five distribution holes 3-1 thereof for welding;

[0045] Next, a sealing plate 5 having evenly distributed fan-shaped reinforcing ribs 5-1 is welded on both ends of the vertical pipe 3. During welding, the fan-shaped reinforcing ribs 5-1 are inserted into the inner hole of the vertical pipe 3;

[0046] Finally, the limiting bracket 6 and the supporting plate 7 are welded.

[0047] The flange 1 of the mud pipe assembly in this embodiment is connected to the rotary joint of the horizontal directional drilling rig body, and the limit bracket 6 is fixed to the body with bolts. The connecting joint 4 distributed in the vertical pipe 3 is connected to the hose assembly joint to transport mud.

Claims

1. A horizontal directional drilling rig mud pipe assembly, Features: The right end of the flange (1) has a transition pipe (1-1), and the right end of the transition pipe (1-1) has a positioning boss (1-2) with a positioning hole; the left end of the transverse pipe (2) is inserted into the positioning hole of the positioning boss (1-2), and the left end of the transverse pipe (2) is welded to the positioning boss (1-2); A vertical pipe (3) is fixed to the right end of the horizontal pipe (2), and a row of distribution holes (3-1) is provided on the vertical pipe (3); An arc-shaped welding boss (4-1) having an arc-shaped surface is provided at one end of the connection joint (4), and an anti-wear inner cylindrical tube (4-2) which is integrated with the connection joint (4) is provided on the inner side of the arc-shaped welding boss (4-1); the anti-wear inner cylindrical tube (4-2) is inserted into the distribution hole (3-1) of the vertical pipe (3), the anti-wear inner cylindrical tube (4-2) and the distribution hole (3-1) are matched with a small gap, and the arc-shaped welding boss (4-1) and the surface of the vertical pipe (3) are attached and welded together as a whole; Two sealing plates (5) are respectively welded to the two ends of the vertical pipe (3); the inner side of the sealing plate (5) has a plurality of fan-shaped reinforcing rib plates (5-1) evenly distributed around the center of the sealing plate (5); the fan-shaped reinforcing rib plates (5-1) are in contact with the inner wall of the vertical pipe (3); A limiting bracket (6) is fixed under the vertical pipe (3), and a support plate (7) is provided between the upper end of the limiting bracket (6) and the vertical pipe (3); The flange (1) is provided with evenly distributed connection holes (1-3) and adjustment elliptical holes (1-4); the flange (1), the transition pipe (1-1) and the positioning boss (1-2) are integrally formed by forging; the transition pipe (1-1) and the transverse pipe (2) have the same diameter.

2. A horizontal directional drilling rig mud pipe assembly according to claim 1, characterized in that: The left end face of the horizontal pipe (2) is a plane, and the right end face of the horizontal pipe (2) is milled with an arc surface. The arc surface of the horizontal pipe (2) and the surface of the vertical pipe (3) are bonded and welded together to form a whole.

3. The horizontal directional drilling rig mud pipe assembly according to claim 1, characterized in that: The end of the connecting joint (4) away from the vertical pipe (3) has a 24° inner cone structure (4-3) and an outer thread (4-4).

4. The horizontal directional drilling rig mud pipe assembly according to claim 1, characterized in that: The lower end of the limit bracket (6) has a positioning flange plate (6-1), the positioning flange plate (6-1) is provided with an oblong hole (6-2), and the limit bracket (6) and the positioning flange plate (6-1) are forged as one piece; the limit bracket (6) is a square tube, the upper end face of the limit bracket (6) is milled with an arc surface, and the arc surface of the limit bracket (6) is attached to the surface of the vertical pipe (3) and welded to form a whole.

5. A horizontal directional drilling rig mud pipe assembly according to claim 4, characterized in that: The support plate (7) is welded to the side of the limiting bracket (6), the support plate (7) is in the shape of a letter "7", the upper end surface of the support plate (7) is milled with an arc surface, and the arc surface of the support plate (7) is attached to the surface of the vertical pipe (3) and welded to form a whole.

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