Two-way connector for grouting drilling machine

Abstract

The invention belongs to the technical field of grouting drilling machines, and particularly relates to a two-way connector for a grouting drilling machine, which comprises an outer sleeve, an inner sleeve and a central pipe, the front end of the outer sleeve is provided with a front end slurry inlet and a lateral slurry inlet which are connected with a first slurry inlet head and a second slurry inlet head; the front pipe section of the inner sleeve is rotatably and hermetically connected with the front end of the outer sleeve; a water passing hole in the pipe wall of the transition section is communicated with the second slurry inlet head; the middle pipe section is rotatably and hermetically connected with the rear end of the outer sleeve; the central pipe is mounted in the inner sleeve and is in sealed connection with the front pipe section, and a pipe cavity of the central pipe is communicated with the first slurry inlet head; the transition section, the middle pipe section and the rear pipe section are matched with the center pipe in a gap mode so that a second slurry passing channel can be formed between the center pipe and the inner sleeve. According to the scheme, the two-way connector can achieve two-way grouting, so that grout is isolated from each other, mixing of the two kinds of grout is prevented, and the two-way connector can be directly installed on a two-fluid drill rod and is suitable for being applied to an advanced drilling machine and an underground drilling machine with the two-fluid drill rod.

Description

Technical Field

[0001] The invention belongs to the technical field of grouting drills, and in particular relates to a two-way joint for a grouting drill. Background Art

[0002] During the drilling operation, the anchor drilling rig often needs to inject grout into the drill bit through the drill pipe to achieve cooling or lubrication. The drill pipe in the prior art is mostly a single-channel structure. When grouting, this structure only needs to inject the mixed slurry through the rotating connector at the top of the drill pipe.

[0003] However, with the development of drilling technology, the separate injection of different slurries has become the main trend. For this reason, a dual-liquid drill pipe capable of injecting two kinds of slurries is designed in the prior art. The existing rotary connector is not compatible with the dual-liquid drill pipe. Therefore, it is necessary to design a two-way joint structure that can be suitable for the dual-liquid drill pipe. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a two-way joint for a grouting drill.

[0005] The technical solution adopted by the present invention is:

[0006] A two-way joint for a grouting drill comprises an outer casing, an inner casing and a center pipe;

[0007] The front end of the outer sleeve is provided with a front pulp inlet, and the tube wall in the middle of the outer sleeve is provided with a lateral pulp inlet; the front pulp inlet is connected to a first pulp inlet head, and the lateral pulp inlet is connected to a second pulp inlet head;

[0008] The inner casing comprises a front pipe section, a transition section, a middle pipe section and a rear pipe section which are arranged in sequence from front to rear; the front pipe section is coaxially arranged in the outer casing and is rotatably sealed and connected to the front end of the outer casing through a rotating seal; a water hole is arranged on the pipe wall of the transition section, and the water hole is communicated with the second pulp inlet head; the middle pipe section is coaxially arranged in the outer casing and is rotatably sealed and connected to the rear end of the outer casing through a sealing ring; the rear pipe section is located outside the rear end of the outer casing;

[0009] The central tube is installed in the inner casing; the central tube is sealed and connected to the front tube section, and the tube cavity of the central tube is used as the first slurry passage and is connected to the first slurry inlet head; the transition section, the middle tube section and the rear tube section cooperate with the gap of the central tube to form a second slurry passage between the central tube and the inner casing.

[0010] As an alternative or supplement to the above-mentioned two-way joint: the rear end of the two-way joint is used to connect the double-liquid drill rod of the grouting drill rig, and the double-liquid drill rod includes an outer pipe rod and an inner pipe rod with a gap matching each other; the outer pipe rod is sealed and connected to the rear pipe section, and the gap between the outer pipe rod and the inner pipe rod is connected to the second slurry passage; the inner pipe rod is sealed and connected to the center pipe, and the lumen of the inner pipe rod is connected to the first slurry inlet channel.

[0011] As an alternative or supplement to the above-mentioned two-way joint: a centering ring is arranged between the central tube and the rear tube section, the central tube is inserted into the ring hole in the center of the centering ring, and the outer edge of the centering ring is abutted against the tube wall of the rear tube section; a notch or through hole for slurry passing is arranged on the centering ring.

[0012] As an alternative or supplement to the above two-way joint: steps for pressing against the end face of the centering ring are arranged on the hole wall of the rear pipe section and on the central pipe.

[0013] As an alternative or supplement to the above two-way joint: the sealing ring includes a first sealing ring and a second sealing ring, and the first sealing ring and the second sealing ring are arranged on the pipe wall at the rear end of the outer sleeve in a front-rear manner.

[0014] As an alternative or supplement to the above two-way joint: the rear end of the outer sleeve is connected to a gland, and a bearing is arranged between the gland and the outer wall of the middle pipe section.

[0015] As an alternative or supplement to the above-mentioned two-way joint: the bearing includes a first bearing and a second bearing, the first bearing is arranged in front of the second bearing; a force transmission arc ring is arranged between the first bearing and the second bearing, the force transmission arc ring includes a plurality of force transmission arc petals, the rear edges of the force transmission arc petals are turned inward and snap-fitted with the annular groove on the outer wall of the middle pipe section; the outer surface of the force transmission arc petals is connected with an outer hoop ring.

[0016] As an alternative or supplement to the above-mentioned two-way joint: the step surface between the middle pipe section and the rear pipe section is pressed against the rear end surface of the second bearing inner ring; the rear edge of the pressure cover is turned inward and pressed against the rear end surface of the second bearing outer ring.

[0017] As an alternative or supplement to the above-mentioned two-way joint: the transition section cooperates with the gap of the outer casing so that the water hole and the lateral slurry inlet remain connected when they are misaligned.

[0018] The beneficial effects of the present invention are as follows: the dual-way joint in this scheme can realize dual-way grouting, so that the slurries are isolated from each other to prevent the mixing of the two slurries, and can be directly installed on the dual-liquid drill pipe, and is suitable for use on advanced drilling rigs and tunnel drilling rigs with dual-liquid drill pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below.

[0020] Figure 1 It is a three-dimensional structural diagram of the two-way connector in this scheme;

[0021] Figure 2 It is a cross-sectional structural diagram of the two-way connector in this scheme;

[0022] Figure 3 It is a matching structure diagram of the inner sleeve and the outer sleeve in this scheme;

[0023] Figure 4 It is a cross-sectional structural diagram of the outer sleeve part in this scheme;

[0024] Figure 5 It is a cross-sectional structural diagram of the inner sleeve part in this scheme.

[0025] In the figure: 1-first pulp inlet head; 2-second pulp inlet head; 3-pressure cover; 4-inner sleeve; 41-front pipe section; 42-transition section; 43-middle pipe section; 44-rear pipe section; 45-water hole; 46-ring groove; 5-outer sleeve; 6-rotating seal; 7-first sealing ring; 8-second sealing ring; 9-first bearing; 10-outer hoop; 11-force transmission arc ring; 12-second bearing; 13-center pipe; 14-centering ring. DETAILED DESCRIPTION

[0026] The technical solution in this embodiment will be clearly and completely described below in conjunction with the accompanying drawings. The described embodiments are only some of the embodiments, not all of them. Based on the embodiments in this solution, all other embodiments obtained by ordinary technicians in this field without making creative work are within the protection scope of this solution.

[0027] Example 1

[0028] like Figures 1 to 5 As shown, this embodiment designs a two-way joint for a grouting drill, including an outer casing 5, an inner casing 4, a center pipe 13 and other components.

[0029] The outer sleeve 5 is in the shape of a round tube. The front end of the outer sleeve 5 is provided with a front slurry inlet, which is connected to the first slurry inlet 1 by welding or threaded connection, and the first slurry inlet 1 can be a 90-degree elbow. A lateral slurry inlet is provided on the pipe wall in the middle of the outer sleeve 5; the lateral slurry inlet is connected to the second slurry inlet 2 by welding or threaded connection, and the second slurry inlet 2 is generally a straight pipe.

[0030] The inner sleeve 4 is a circular tube structure with a small front end and a large rear end. The inner sleeve 4 includes a front tube section 41, a transition section 42, a middle tube section 43 and a rear tube section 44 which are arranged in sequence from front to rear.

[0031] The front pipe section 41 is coaxially arranged in the outer sleeve 5, and the front pipe section 41 and the outer sleeve 5 are gap-matched. A rotating seal 6 is arranged in the gap between the front pipe section 41 and the outer sleeve 5. The rotating seal 6 is in a circular ring shape. The inner wall of the rotating seal 6 is sealed and rotatably matched with the outer wall of the front pipe section 41, and the outer wall of the rotating seal 6 is sealed and matched with the inner wall of the outer sleeve 5; when the first slurry inlet head 1 is threadedly connected to the front end slurry inlet, the end face of the first slurry inlet head 1 is pressed against the front end face of the rotating seal 6 to achieve a sealing match.

[0032] The transition section 42 is coaxially arranged in the outer sleeve 5, and the transition section 42 and the outer sleeve 5 are gap-matched. The outer diameter of the transition section 42 is slightly larger than the front pipe section 41, and provides conditions for the formation of the second pulp passage. A water hole 45 is arranged on the pipe wall of the transition section 42, and the water hole 45 is connected to the second pulp inlet 2; and because the transition section 42 and the outer sleeve 5 are gap-matched, the water hole 45 and the lateral pulp inlet can also maintain the connection between the two when the two are misaligned.

[0033] The front part of the middle pipe section 43 is coaxially arranged in the outer sleeve 5, and the rear part extends out of the outer sleeve 5. The middle pipe section 43 is matched with the outer sleeve 5 in a gap. The outer diameter of the middle pipe section 43 is slightly larger than the transition section 42, and provides conditions for the formation of the second slurry passage. The front outer side of the middle pipe section 43 is rotatably sealed and connected to the rear end of the outer sleeve 5 through a sealing ring. The sealing ring includes a first sealing ring 7 and a second sealing ring 8. The first sealing ring 7 and the second sealing ring 8 are arranged on the pipe wall of the rear end of the outer sleeve 5 one after the other. The inner walls of the first sealing ring 7 and the second sealing ring 8 are sealed and rotatably matched with the outer wall of the middle pipe section 43, and the outer walls of the first sealing ring 7 and the second sealing ring 8 are sealed and matched with the inner wall of the outer sleeve 5.

[0034] The rear pipe section 44 is located outside the outer sleeve 5 and is coaxial with the outer sleeve 5. An internal thread is provided on the inner wall of the rear end of the rear pipe section 44 to facilitate threaded connection with the outer pipe rod of the double-liquid drill pipe.

[0035] The central tube 13 is installed in the inner sleeve 4; the central tube 13 is sealed and connected to the front tube section 41 (it can be connected by a tight fit or an interference fit to achieve sealing), and the tube cavity of the central tube 13 is used as the first slurry passage and is connected to the first slurry inlet head 1; the transition section 42, the middle tube section 43 and the rear tube section 44 are matched with the central tube 13 gap to form a second slurry passage between the central tube 13 and the inner sleeve 4, and the second slurry passage is connected to the water hole 45 and the lateral slurry inlet.

[0036] A centering ring 14 is arranged between the central tube 13 and the rear tube section 44. The function of the centering ring 14 is to support the rear end of the central tube 13 so that the rear end of the central tube 13 remains at the center of the rear tube section 44. The central tube 13 is inserted into the annular hole at the center of the centering ring 14, and the outer edge of the centering ring 14 abuts against the tube wall of the rear tube section 44. A notch or through hole for slurry passage is arranged on the centering ring 14, so that the slurry can flow from the front side of the centering ring 14 to the rear side of the centering ring 14.

[0037] The hole wall of the rear pipe section 44 and the central pipe 13 are both provided with steps for pressing against the end surface of the centering ring 14 .

[0038] The rear end of the outer sleeve 5 is connected to a gland 3, and a bearing is arranged between the gland 3 and the outer wall of the middle pipe section 43. The bearing includes a first bearing 9 and a second bearing 12, and the first bearing 9 is arranged in front of the second bearing 12; a force transmission arc ring 11 is arranged between the first bearing 9 and the second bearing 12, and the force transmission arc ring 11 includes a plurality of force transmission arc petals, and the rear edge of the force transmission arc petals is turned inward and snap-fitted with the annular groove 46 on the outer wall of the middle pipe section 43; the outer ring 10 is connected to the outer surface of the force transmission arc petals, and the outer ring 10 is used to gather the force transmission arc petals together. The step surface between the middle pipe section 43 and the rear pipe section 44 is pressed against the rear end face of the inner ring of the second bearing 12; the rear edge of the gland 3 is turned inward and pressed against the rear end face of the outer ring of the second bearing 12.

[0039] When the two-way joint for the grouting drill in this embodiment is used: the rear end of the two-way joint is connected to the double-liquid drill rod of the grouting drill, and the double-liquid drill rod includes an outer pipe rod and an inner pipe rod that fit each other with a gap; after the two-way joint is connected to the double-liquid drill rod, the outer pipe rod is threadedly connected and sealed with the rear pipe section 44, and there is a gap between the outer pipe rod and the rear end of the central pipe 13, so that the gap between the outer pipe rod and the inner pipe rod is connected to the second slurry passage. The inner pipe rod is sealed and connected to the central pipe 13, and the tube cavity of the inner pipe rod is connected to the first slurry inlet channel.

[0040] The above embodiments are merely examples for the purpose of clarifying the description, and are not intended to limit the implementation methods; it is not necessary and impossible to list all implementation methods exhaustively. However, obvious changes or modifications derived therefrom are still within the scope of protection of the present technology.

Claims

1. A two-way joint for a grouting drill, characterized in that: It comprises an outer sleeve (5), an inner sleeve (4) and a central tube (13); The front end of the outer sleeve (5) is provided with a front pulp inlet, and the middle part of the outer sleeve (5) is provided with a lateral pulp inlet; the front pulp inlet is connected to a first pulp inlet head (1), and the lateral pulp inlet is connected to a second pulp inlet head (2); The inner sleeve (4) comprises a front pipe section (41), a transition section (42), a middle pipe section (43) and a rear pipe section (44) which are arranged in sequence from front to rear; the front pipe section (41) is coaxially arranged in the outer sleeve (5) and is rotatably sealed and connected to the front end of the outer sleeve (5) through a rotating seal (6); a water hole (45) is arranged on the pipe wall of the transition section (42), and the water hole (45) is connected to the second pulp inlet head (2); the middle pipe section (43) is coaxially arranged in the outer sleeve (5) and is rotatably sealed and connected to the rear end of the outer sleeve (5) through a sealing ring; the rear pipe section (44) is located outside the rear end of the outer sleeve (5); The central tube (13) is installed in the inner sleeve (4); the central tube (13) is sealedly connected to the front tube section (41); the tube cavity of the central tube (13) is used as a first pulp passage and is connected to the first pulp inlet head (1); the transition section (42), the middle tube section (43) and the rear tube section (44) are matched with the central tube (13) in a gap to form a second pulp passage between the central tube (13) and the inner sleeve (4).

2. The two-way joint for a grouting drill according to claim 1, characterized in that: The rear end of the two-way joint is used to connect the double-liquid drill rod of the grouting drill, and the double-liquid drill rod comprises an outer tube rod and an inner tube rod that are fitted with each other through a gap; the outer tube rod is sealedly connected to the rear tube section (44), and the gap between the outer tube rod and the inner tube rod is communicated with the second slurry passage; the inner tube rod is sealedly connected to the central tube (13), and the tube cavity of the inner tube rod is communicated with the first slurry inlet channel.

3. The two-way joint for a grouting drill according to claim 1, characterized in that: A centering ring (14) is provided between the central tube (13) and the rear tube section (44); the central tube (13) is inserted into the annular hole at the center of the centering ring (14); the outer edge of the centering ring (14) abuts against the tube wall of the rear tube section (44); a notch or through hole for pulp passage is provided on the centering ring (14).

4. The two-way joint for a grouting drill according to claim 3, characterized in that: Steps for pressing against the end surface of the centering ring (14) are provided on the hole wall of the rear pipe section (44) and on the center pipe (13).

5. The two-way joint for a grouting drill according to claim 1, characterized in that: The sealing ring comprises a first sealing ring (7) and a second sealing ring (8), and the first sealing ring (7) and the second sealing ring (8) are arranged one after the other on the tube wall at the rear end of the outer sleeve (5).

6. The two-way joint for a grouting drill according to any one of claims 1 to 5, characterized in that: The rear end of the outer sleeve (5) is connected to a gland (3), and a bearing is provided between the gland (3) and the outer wall of the middle pipe section (43).

7. The two-way joint for a grouting drill according to claim 6, characterized in that: The bearing comprises a first bearing (9) and a second bearing (12), wherein the first bearing (9) is arranged in front of the second bearing (12); a force transmission arc ring (11) is arranged between the first bearing (9) and the second bearing (12), wherein the force transmission arc ring (11) comprises a plurality of force transmission arc petals, the rear edges of the force transmission arc petals are turned inwards and snap-fitted with the annular grooves (46) on the outer wall of the middle pipe section (43); and an outer hoop ring (10) is externally connected to the force transmission arc petals.

8. The two-way joint for a grouting drill according to claim 7, characterized in that: The step surface between the middle pipe section (43) and the rear pipe section (44) is pressed against the rear end surface of the inner ring of the second bearing (12); the rear edge of the gland (3) is turned inward and pressed against the rear end surface of the outer ring of the second bearing (12).

9. The two-way joint for a grouting drill according to claim 6, characterized in that: The transition section (42) is matched with the gap of the outer sleeve (5) so that the water hole (45) and the lateral pulp inlet remain connected when they are misaligned.

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