A multi-channel rotary joint combination

Abstract

A multi-channel rotary joint combination includes a plurality of slurry-gas and slurry-line rotary joints and a reduction box; the slurry-gas and slurry-line rotary joints each include a support frame, a lower rotating shaft, an upper rotating shaft, a sealing gasket, a rotating shaft jacket, an upper sleeve cover, a lower sleeve cover, an upper connecting shaft, an upper bracket and a transition joint; the slurry-gas and slurry-line rotary joints are arranged above the hollow main shaft of the reduction box; the hollow main shaft is arranged transversely along the reduction box; the support frame is arranged on the left and right sides of the slurry-gas and slurry-line rotary joints; the sealing gasket is located between the lower rotating shaft and the hollow main shaft; the first and second lower shaft grouting holes and the lower shaft air injection holes of the lower rotating shaft are respectively connected with the first and second main shaft grouting channels and the main shaft air injection channels of the hollow main shaft; the upper rotating shaft is placed in the lower shaft counterbore, and the upper shaft air delivery hole is connected with the lower shaft air injection hole; the transition joint is fixed to the upper rotating shaft; the upper sleeve cover is fixed to the rotating shaft jacket. The present invention is suitable for the requirements of rotary conveying of slurry and gas and sensor wiring of a mixing pile drilling rig, and meets the functional requirements of grouting, jetting and monitoring.

Description

Technical Field

[0001] The invention relates to a multi-channel swivel joint assembly, in particular to a cement soil mixing pile drilling rig for underground water-stop curtain wall construction, foundation pit excavation and protection, dam anti-seepage treatment and foundation reinforcement and improvement. Background Art

[0002] At present, cement mixing pile construction technology is widely used in industrial construction and urban construction foundation construction. Through a special multi-axis soil mixing drill, during the drilling and lifting process of the drill rod, cement slurry curing agent is sprayed from the front end of the drill bit, and forcedly mixed with loose soil, sand and gravel and curing agent to form a cement soil mixing reinforced foundation with integrity, water stability and certain strength. A large number of construction cases show that the internal homogeneity of the pile body varies greatly during the formation process, and the quality of the upper part of the cement soil mixing pile is better than that of the lower part.

[0003] The existing cement soil mixing pile drilling rig generally adopts the method of grouting and jetting at the bottom of the drill bit. As the drilling depth increases, the drill bit is subjected to a large soil pressure, and the slurry jetting resistance is large, resulting in insufficient cement slurry in the surrounding soil, making it difficult to ensure uniform mixing of cement slurry and soil, thereby affecting the homogeneous performance of the pile body. In order to improve the homogeneous performance of the pile body after drilling and mixing of cement soil mixing piles, ensure the consistency of the quality of the pile body from top to bottom, and improve the vertical accuracy requirements of the wall after the pile is formed, it is necessary to make necessary technical improvements to the drill rod and drill bit structure, set up multi-channel pipelines in the inner cavity of the drill rod and its drill bit to ensure that grouting and jetting are simultaneously performed on the surrounding soil during the mixing process, and realize grouting on the surrounding soil at different stages when the drill rod and its drilling tools are drilled down and lifted up, so as to promote the mixing of the surrounding soil and cement slurry components. By setting a drill rod inclinometer to monitor the deflection of the drill rod during rotary drilling, the operator is prompted to take corrective measures to improve the vertical accuracy of the wall of the mixing pile, thereby improving the construction quality and project progress of the mixing pile, improving construction efficiency and reducing construction costs. Summary of the invention

[0004] The main purpose of the present invention is to overcome the shortcomings of the existing mixing pile drilling rigs and provide a multi-channel swivel joint combination that can meet the needs of rotating and transporting slurry and compressed gas to the drill rod and its drilling tools and adapt to the wiring of monitoring cables, so as to meet the functional requirements of the mixing pile drilling rig to spray and inject air to the surrounding soil at different stages when the drill rod and its drilling tools are drilled down and lifted up, promote the full mixing of the surrounding soil and cement slurry, achieve the consistency of the pile body strength after the pile is formed, and improve the construction quality of the mixing pile; realize the arrangement of signal cables in the air pipe to detect the degree of deflection of the drill rod during rotation, so as to prompt the operator to take corresponding correction measures, greatly improve the operating efficiency of the mixing pile drilling rig, shorten the construction period and save construction costs.

[0005] The present invention is achieved through the following technical solutions:

[0006] A multi-channel rotary joint assembly, comprising: a plurality of slurry-gas rotary joints, a slurry line rotary joint and a reduction box, wherein:

[0007] The slurry-gas rotary joint comprises a support frame, a lower rotating shaft, an upper rotating shaft, a sealing gasket, a rotating shaft jacket, an upper sleeve cover, a lower sleeve cover, an upper connecting shaft, an upper bracket, a transition joint, a rotary gas injection joint, an air delivery pipe and a diverter block;

[0008] The pulp line rotary joint includes a support frame, a lower rotating shaft, an upper rotating shaft, a sealing gasket, a rotating shaft jacket, an upper sleeve cover, a lower sleeve cover, an upper connecting shaft, an upper bracket, a transition joint and a slip electric ring; wherein: the slip electric ring includes an outer cable connected to the outer ring of the slip electric ring, an inner cable led from the inner ring of the slip electric ring and a pressure plate; wherein:

[0009] The support frame includes a first stop claw, a second stop claw and a support frame flange located at the bottom;

[0010] The lower rotating shaft comprises a first lower shaft grouting hole, a second lower shaft grouting hole, a lower shaft air injection hole, a first lower shaft transverse grouting hole and a second lower shaft transverse grouting hole respectively connected to the first lower shaft grouting hole and the second lower shaft grouting hole, and also comprises a lower shaft countersunk hole at its upper end and a lower shaft docking cover at its outer wall;

[0011] The upper rotating shaft includes an upper shaft air delivery hole located therein and an upper shaft shoulder at the lower end;

[0012] The sealing gasket comprises a sealing gasket body and three upper convex lip rings with upper steel sleeves;

[0013] The shaft sleeve includes a first grouting ring groove and a second grouting ring groove located on the inner wall thereof, a plurality of sleeve ring grooves and sleeve grooves with oil supply nozzles, a sleeve countersunk hole located at the upper end thereof, a first grouting hole and a second grouting hole located on the outer wall thereof and connected to the first grouting ring groove and the second grouting ring groove respectively, and also includes a first locking hole and a second locking hole located on the outer wall thereof;

[0014] The upper cover comprises a first upper cover countersunk hole and a second upper cover countersunk hole;

[0015] The lower cover comprises a first lower cover countersunk hole and a second lower cover countersunk hole;

[0016] The upper bracket includes a bracket ring and a fixed vertical plate located on one side of the bracket ring;

[0017] The reduction box comprises a box body, a box cover, a plurality of hollow spindles having a first spindle grouting channel, a second spindle grouting channel, a spindle air injection channel and a spindle counterbore, and an end ring;

[0018] Features:

[0019] The hollow main shafts of the reduction box are arranged in a straight line along the transverse direction of the box body, and each hollow main shaft is arranged in a manner that both ends extend out of the reduction box. The upper end of each hollow main shaft extends out of the box cover and is located in each end ring, and the lower end of each hollow main shaft extends out of the box body and is connected to the external docking flange, drill rod and drilling tool; the first main shaft grouting channel, the second main shaft grouting channel, and the main shaft air injection channel of the hollow main shaft are arranged in a manner that their cross-sectional directions are equilateral triangle symmetrical and the axial directions are parallel to each other, and the upper end faces of the first main shaft grouting channel, the second main shaft grouting channel, and the main shaft air injection channel are all located at the main shaft countersunk hole of the hollow main shaft;

[0020] The three upper convex lip rings of the sealing gasket are arranged in an equilateral triangle symmetrical manner on the upper end surface of the sealing gasket body, and the upper steel sleeve is arranged in the hole of the upper convex lip ring; the sealing gasket is arranged at the main shaft counterbore of the hollow main shaft, and the three upper convex lip rings of the sealing gasket respectively enter the first lower shaft grouting hole, the second lower shaft grouting hole, and the lower shaft air injection hole at the lower end of the lower rotating shaft;

[0021] The plurality of slurry-gas rotary joints and slurry-line rotary joints are arranged above each hollow main shaft of the reduction box, and the plurality of slurry-gas rotary joints and slurry-line rotary joints all pass through the end ring of the reduction box through their lower rotating shafts to reach the upper end of the hollow main shaft;

[0022] The support frame is respectively arranged on the left and right sides of each slurry-gas rotary joint and the slurry-line rotary joint, and the first stop claw and the second stop claw of the support frame are respectively placed in the first locking hole and the second locking hole on the outer wall of the rotating shaft sleeve of each slurry-gas rotary joint and the slurry-line rotary joint; the support frame flange is fixedly mounted on each installation position of the box cover of the reduction box, so that multiple slurry-gas rotary joints and the slurry-line rotary joints are fixedly mounted on the upper end of each hollow main shaft;

[0023] The first lower shaft grouting hole, the second lower shaft grouting hole and the lower shaft air injection hole of the lower rotating shaft are arranged in a manner that their cross-sectional directions are equilateral triangle symmetrical and their axes are parallel to each other; the first lower shaft grouting hole and the second lower shaft grouting hole are respectively connected with the first lower shaft transverse grouting hole and the second lower shaft grouting hole in the lower rotating shaft, and the first lower shaft grouting hole and the second lower shaft grouting hole are respectively connected with the first grouting ring groove and the second grouting ring groove of the rotating shaft outer sleeve; the lower end of the lower rotating shaft is placed in the main shaft counterbore of the hollow main shaft, and the first lower shaft grouting hole, the second lower shaft grouting hole and the lower shaft air injection hole of the lower rotating shaft are respectively connected with the first main shaft grouting channel, the second main shaft grouting channel and the main shaft air injection channel of the hollow main shaft; the lower shaft docking cover is fixed on the hollow main shaft by screws to connect the lower rotating shaft and the hollow main shaft into one;

[0024] The first lower cover countersunk hole and the second lower cover countersunk hole of the lower cover are respectively installed with bearings and skeleton oil seals, and then sleeved on the installation position on the lower rotating shaft;

[0025] The shaft outer sleeve is mounted on the lower shaft and is fastened to the lower sleeve cover; the outer sleeve ring groove and the outer sleeve groove are respectively installed with O-rings and filled with grease; the first grouting hole and the second grouting hole of the shaft outer sleeve are respectively connected with the first grouting ring groove and the second grouting ring groove in the shaft outer sleeve, and the other ends are respectively connected to external grouting pipelines, and the proportioned cement slurry is pumped into the external grouting system;

[0026] The upper rotating shaft is placed in the lower shaft counterbore of the lower rotating shaft through its upper shaft shoulder, and its upper shaft air delivery hole is arranged obliquely and is connected with the lower shaft air injection hole of the lower rotating shaft; the upper end surface of the upper rotating shaft is fixed with a transition joint;

[0027] The upper connecting shaft is placed on the upper end surface of the transition joint through the upper shaft hole shoulder at the bottom thereof and then fixed to the upper rotating shaft through screws, thereby connecting the upper connecting shaft, the transition joint and the upper rotating shaft into one; the upper shaft air supply hole of the upper connecting shaft is connected with the through hole of the transition joint and the upper shaft air supply hole of the upper rotating shaft;

[0028] The first lower sleeve hole groove and the second upper sleeve hole groove of the upper sleeve cover are respectively installed with bearings and skeleton oil seals, and then pass through the upper connecting shaft and the transition joint and are fixed to the upper end surface of the rotating shaft sleeve;

[0029] The upper bracket is fixed on the upper cover through a bracket ring; the fixed vertical plate is fixed on one side of the bracket ring;

[0030] The rotary gas injection joint of the slurry-gas rotary joint is fixed on the upper connecting shaft; the diverter block is fixed on the fixed vertical plate; the air supply pipe connects the rotary gas injection joint and the diverter block;

[0031] The slipping electric ring of the slurry line rotary joint is mounted on the upper sleeve cover through its inner ring, the pressure plate is fixed on the end face of the slipping electric ring, and the other end is fastened to the fixed vertical plate; the inner cable passes through the through hole of the upper connecting shaft, the upper shaft air supply hole of the upper rotating shaft, the lower shaft air injection hole of the lower rotating shaft, the main shaft air injection channel of the hollow main shaft, and then enters the air pipe of the external drill rod and its drilling tool and is connected to the tilt sensor.

[0032] The present invention may be that the parallelism deviation of the axial center line between the first main shaft grouting channel, the second main shaft grouting channel and the main shaft air injection channel of the hollow main shaft, and between the first lower shaft grouting hole, the second lower shaft grouting hole and the lower shaft air injection hole of the lower rotating shaft are all 0.08~0.10mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the multi-channel rotary joint assembly of the present invention;

[0034] Figure 2 yes Figure 1 Left view of

[0035] Figure 3 yes Figure 1 A top view of

[0036] Figure 4 yes Figure 3 Middle AA section view;

[0037] Figure 5 It is a schematic diagram of the structure of the slurry-gas rotary joint in the multi-channel rotary joint assembly of the present invention;

[0038] Figure 6 yes Figure 5 Middle EE section view;

[0039] Figure 7 yes Figure 6 Middle MM section view;

[0040] Figure 8 It is a schematic structural diagram of a pulp line rotary joint in a multi-channel rotary joint assembly of the present invention;

[0041] Fig. 9 yes Figure 8 Middle FF section view;

[0042] Fig.10 It is the NN section view in 9;

[0043] Fig.11 It is a schematic diagram of the structure of the sealing pad in the multi-channel rotary joint assembly of the present invention;

[0044] Fig.12 yes Fig.11 Middle BB section view. DETAILED DESCRIPTION

[0045] The following is a further description of the multi-channel rotary joint assembly of the present invention in conjunction with the accompanying drawings.

[0046] A multi-channel rotary joint assembly, comprising: a plurality of slurry-gas rotary joints 20, a slurry-line rotary joint 20 and a reduction box 30, wherein the slurry-gas rotary joint 20 comprises a support frame 200, a lower rotating shaft 201, an upper rotating shaft 202, a sealing gasket 50, a rotating shaft jacket 204, an upper sleeve cover 205, a lower sleeve cover 206, an upper connecting shaft 207, an upper bracket 208, a transition joint 209, a rotary gas injection joint 210, an air delivery pipe 2101 and a diverter block 2102; the slurry-line rotary joint 20' comprises a support frame 200, a lower rotating shaft 201, an upper rotating shaft 202, a sealing gasket 50, a rotating shaft jacket 204, an upper sleeve cover 205, a lower sleeve cover 206, an upper connecting shaft 207, an upper bracket 208, a transition joint 209, a rotary gas injection joint 210, an air delivery pipe 2101 and a diverter block 2102. The support frame 200 includes a first stop claw 2006, a second stop claw 2007 and a support flange 2008 at the bottom; the lower rotating shaft 201 includes a first lower shaft grouting hole 2011, a second lower shaft grouting hole 2012, a lower shaft air injection hole 2013, a first lower shaft horizontal grouting hole 20111 and a second lower shaft horizontal grouting hole 20121 which are respectively connected to the first lower shaft grouting hole 2011 and the second lower shaft grouting hole 2012, and also includes a lower shaft grouting hole 2013 and a lower shaft grouting hole 2014. The lower shaft countersunk hole 2014 at the end and the lower shaft docking cover 2015 located on the outer wall thereof; the upper rotating shaft 202 includes an upper shaft air supply hole 2023 located therein and an upper shaft shoulder 2024 at the lower end; the sealing gasket 50 includes a sealing gasket body 500 and three upper convex lip rings 501 with an upper steel sleeve 5011; the rotating shaft outer sleeve 204 includes a first grouting ring groove 2041, a second grouting ring groove 2042, a plurality of outer sleeve ring grooves 2043 and outer sleeve grooves 2044 with oil supply nozzles located on the inner wall thereof, an outer sleeve countersunk hole 2045 located at the upper end thereof, and a first grouting hole 20411 located on the outer wall thereof and connected to the first grouting ring groove 2041 and the second grouting ring groove 2042 respectively. and a second grouting hole 20421, and also includes a first locking hole 2046 and a second locking hole 2047 located on its outer wall; the upper cover 205 includes a first upper cover countersunk hole 2051 and a second upper cover countersunk hole 2052; the lower cover 206 includes a first lower cover countersunk hole 2061 and a second lower cover countersunk hole 2062; the upper bracket 208 includes a bracket ring 2081 and a fixed vertical plate 2082 located on one side of the bracket ring; the reduction box 30 includes a box body 300, a box cover 301, a plurality of hollow spindles 302 with a first spindle grouting channel 3021, a second spindle grouting channel 3022, a spindle air injection channel 3023 and a spindle countersunk hole 3026, and an end ring 306; wherein:

[0047] The hollow main shafts 302 of the reduction box 30 are arranged in a straight line along the transverse direction of the box body 300, and each hollow main shaft 302 is arranged in a manner that both ends extend out of the reduction box 30, and the upper end of each hollow main shaft 302 extends out of the box cover 301 and is located in each end ring 306, and the lower end of each hollow main shaft 302 extends out of the box body 300 and is connected to an external docking flange, drill rod and drilling tools; the first main shaft grouting channel 3021, the second main shaft grouting channel 3022, and the main shaft air injection channel 3023 of the hollow main shaft 302 are arranged in a manner that their cross-sectional directions are equilateral triangle symmetrical and their axial directions are parallel to each other, and the upper end faces of the first main shaft grouting channel 3021, the second main shaft grouting channel 3022, and the main shaft air injection channel 3023 are all located at the main shaft counterbore 3026 of the hollow main shaft 302.

[0048] The three upper convex lip rings 501 of the sealing gasket 50 are arranged in an equilateral triangle symmetrical manner on the upper end surface of the sealing gasket body 500, and the upper steel sleeve 5011 is set in the hole of the upper convex lip ring 501; the sealing gasket 50 is set at the main shaft counterbore 3026 of the hollow main shaft 302, and the three upper convex lip rings 501 of the sealing gasket enter the first lower shaft grouting hole 2011, the second lower shaft grouting hole 2012, and the lower shaft gas injection hole 2013 at the lower end of the lower rotating shaft 201 respectively. The outer circle of the three convex lip rings on the sealing gasket is in close contact with the inner wall of each slurry pipe and gas pipe, effectively isolating the slurry and compressed gas, and preventing the leakage of cement slurry and the leakage of compressed gas; in addition, the steel sleeve set on the inner wall of the convex lip ring effectively convexly supports the lip ring, further improving the sealing and leak-proof effect of the sealing gasket.

[0049] The multiple slurry-gas rotary joints 20 and slurry-line rotary joints 20' are arranged above the hollow main shafts 302 of the reduction box 30. The multiple slurry-gas rotary joints 20 and slurry-line rotary joints 20' all pass through the end ring 306 of the reduction box 30 through their lower rotating shafts 201 to reach the upper end of the hollow main shaft 302.

[0050] The support frame 200 is respectively arranged on the left and right sides of each slurry-gas rotary joint 20 and the slurry-line rotary joint 20', and the first stop claw 2006 and the second stop claw 2007 of the support frame are respectively placed in the first locking hole 2046 and the second locking hole 2047 on the outer wall of the rotating shaft sleeve 204 of each slurry-gas rotary joint 20 and the slurry-line rotary joint 20'; the support frame flange 2008 is fixedly mounted at each installation position of the box cover 301 of the reduction box 30, so that multiple slurry-gas rotary joints 20 and slurry-line rotary joints 20' are fixedly mounted on the upper end of each hollow main shaft 302.

[0051] The first lower shaft grouting hole 2011, the second lower shaft grouting hole 2012 and the lower shaft air injection hole 2013 of the lower rotating shaft 201 are arranged in a manner that their cross-sectional direction is equilateral triangle symmetrical and their axes are parallel to each other; the first lower shaft grouting hole 2011 and the second lower shaft grouting hole 2012 are respectively connected with the first lower shaft transverse grouting hole 20111 and the second lower shaft transverse grouting hole 20121 in the lower rotating shaft 201, and the first lower shaft transverse grouting hole 20111 and the second lower shaft transverse grouting hole 20121 are respectively connected with the first grouting ring groove of the rotating shaft sleeve 204 2041 and the second grouting ring groove 2042 are connected; the lower end of the lower rotating shaft 201 is placed in the main shaft counterbore 3026 of the hollow main shaft 302, and the first lower shaft grouting hole 2011, the second lower shaft grouting hole 2012 and the lower shaft air injection hole 2013 of the lower rotating shaft are respectively connected with the first main shaft grouting channel 3021, the second main shaft grouting channel 3022 and the main shaft air injection channel 3023 of the hollow main shaft 302; the lower shaft docking cover 2015 is fixed on the hollow main shaft 302 by screws, connecting the lower rotating shaft 201 and the hollow main shaft into one.

[0052] The parallelism deviation of the axial center line between the first main shaft grouting channel 3021, the second main shaft grouting channel 3022 and the main shaft air injection channel 3023 of the hollow main shaft 302, and between the first lower shaft grouting hole 2011, the second lower shaft grouting hole 2012 and the lower shaft air injection hole 2013 of the lower rotating shaft 201 is 0.08-0.10mm. In this way, it is convenient to install the sealing gasket in place and ensure that the force distribution is uniform under compression, effectively improve the sealing performance of the joint, prevent the occurrence of cement slurry leakage and compressed gas leakage, and greatly improve the safety performance of drilling construction.

[0053] The lower cover 206 is respectively installed with bearings and skeleton oil seals in the first lower cover countersunk hole 2061 and the second lower cover countersunk hole 2062 and then mounted on the installation position on the lower rotating shaft 201 .

[0054] The shaft sleeve 204 is mounted on the lower shaft 201 and is tightly connected to the lower sleeve cover 206; the sleeve ring groove 2043 and the sleeve groove 2044 are respectively installed with O-rings and grease; in this way, the upper and lower slurries can be effectively isolated to prevent the upper and lower slurries from flowing into each other, and to prevent the slurry from leaking from the shaft sleeve 204 and the lower shaft 201, thereby improving its sealing performance. The first grouting hole 20411 and the second grouting hole 20421 of the shaft sleeve 204 are respectively connected to the first grouting ring groove 2041 and the second grouting ring groove 2042 in the shaft sleeve 204, and the other ends are respectively connected to the external grouting pipeline, and the proportioned cement slurry is pumped in by the external grouting system. It is ensured that the cement slurry sprayed out by the mixing pile drilling rig at different stages of drilling down and lifting is fully mixed with the surrounding soil, and the pile body quality of the mixing pile after the pile is formed meets the technical requirements.

[0055] The upper rotating shaft 202 is placed in the lower shaft countersunk hole 2014 of the lower rotating shaft 201 through its upper shaft shoulder 2024, and its upper shaft air supply hole 2023 is set obliquely and communicates with the lower shaft air injection hole 2013 of the lower rotating shaft 201; the upper end surface of the upper rotating shaft 202 is fixed with a transition joint 209.

[0056] The upper connecting shaft 207 is placed on the upper end surface of the transition joint 209 through the upper shaft hole shoulder 2071 located at the bottom thereof and then fixed to the upper rotating shaft 202 by screws, thereby connecting the upper connecting shaft 207, the transition joint 209 and the upper rotating shaft 202 into one; the upper shaft air supply hole 2023 of the upper connecting shaft 207 is connected with the through hole of the transition joint 209 and the upper shaft air supply hole 2023 of the upper rotating shaft 202.

[0057] The first upper cover countersunk hole 2051 and the second upper cover countersunk hole 2052 of the upper cover 205 are respectively installed with bearings and skeleton oil seals, and then pass through the upper connecting shaft 207 and the transition joint 209 to be fixed to the upper end surface of the rotating shaft sleeve 204.

[0058] The upper bracket 208 is fixed on the upper cover 205 through a bracket ring 2081 ; the fixed vertical plate 2082 is fixed on one side of the bracket ring 2081 .

[0059] The rotary air injection joint 210 of the slurry-air rotary joint 20 is fixed on the upper connecting shaft 207; the diverter block 2102 is fixed on the fixed vertical plate 2082; the air supply pipe 2101 connects the rotary air injection joint 210 and the diverter block 2102. After the external air pipe is connected to the diverter block, compressed air is pumped in, so that the mixing pile drilling rig can realize the functional requirements of spraying and jetting to the surrounding soil at different stages when the drill rod is drilled down and lifted up, so as to achieve full mixing of the surrounding soil and cement slurry and ensure that the strength of the pile body is consistent from top to bottom.

[0060] The slipping electric ring 211 of the slurry line rotary joint 20' is mounted on the upper cover 205 through its inner ring, the pressure plate 2113 is fixed on the end face of the slipping electric ring 211, and the other end is fastened to the fixed vertical plate 2082; the inner cable 2111 passes through the through hole of the upper connecting shaft 207, the upper shaft air supply hole 2023 of the upper rotating shaft 202, the lower shaft air injection hole 2013 of the lower rotating shaft 201, and the main shaft air injection channel 3023 of the hollow main shaft 302, and then enters the air pipe of the external drill pipe and connects to the tilt sensor. When the mixing pile drilling rig rotates and drills, the outer ring of the sliding electric ring 211 does not rotate, while the inner ring of the sliding electric ring 211 rotates with the upper connecting shaft 207, the upper rotating shaft 202, the lower rotating shaft 201 and the hollow main shaft 302 of the reduction gearbox 30 connected thereto, and the external drill rod, and the sensor cable led out thereof rotates accordingly without getting entangled, thereby ensuring that the inclinometer sensor connected thereto and located at the outer wall of the external drill rod transmits the monitored drill rod deflection to the external operation control system and display screen, so that the operator can take corresponding correction measures and effectively ensure the normal construction of the mixing pile drilling rig.

[0061] The multi-channel rotary joint combination of the present invention satisfies the requirements of slurry and compressed gas being rotatably transported to the drill rod and adapting to the wiring of monitoring cables, and meets the functional requirements of the mixing pile drilling rig to spray and inject air to the surrounding soil at different stages when the drill rod is drilled down and lifted up, thereby promoting full mixing of the surrounding soil and cement slurry, achieving consistency in the strength of the pile body after pile formation, and improving the construction quality of the mixing piles; by arranging signal cables and tilt sensors in the air pipe in the inner cavity of the drill rod of the mixing pile drilling rig, the degree of deviation of the center line during the rotation of the drill rod is monitored in real time, and the operator is prompted to take corresponding correction measures, thereby greatly improving the operating efficiency of the mixing pile drilling rig, shortening the construction period and saving construction costs.

[0062] Various changes and improvements may be made to the present invention without departing from the overall concept of the present invention. However, as long as they are identical or equivalent to the present invention, they also fall within the protection scope of the present invention.

Claims

1. A multi-channel rotary joint assembly, comprising: A plurality of slurry-gas rotary joints (20), a slurry-line rotary joint (20') and a reduction gearbox (30), wherein: The slurry-gas rotary joint (20) comprises a support frame (200), a lower rotating shaft (201), an upper rotating shaft (202), a sealing gasket (50), a rotating shaft jacket (204), an upper sleeve cover (205), a lower sleeve cover (206), an upper connecting shaft (207), an upper bracket (208), a transition joint (209), a rotary gas injection joint (210), an air delivery pipe (2101) and a diverter block (2102); The pulp line rotary joint (20') comprises a support frame (200), a lower rotating shaft (201), an upper rotating shaft (202), a sealing gasket (50), a rotating shaft outer sleeve (204), an upper sleeve cover (205), a lower sleeve cover (206), an upper connecting shaft (207), an upper bracket (208), a transition joint (209) and a slipping electric ring (211); wherein: the slipping electric ring (211) comprises an outer cable (2112) connected to the outer ring of the slipping electric ring, an inner cable (2111) led out from the inner ring of the slipping electric ring (211), and a pressure plate (2113); wherein: The support frame (200) comprises a first stop claw (2006), a second stop claw (2007) and a support frame flange (2008) located at the bottom; The lower rotating shaft (201) comprises a first lower shaft grouting hole (2011), a second lower shaft grouting hole (2012), a lower shaft air injection hole (2013), a first lower shaft transverse grouting hole (20111) and a second lower shaft transverse grouting hole (20121) respectively connected to the first lower shaft grouting hole (2011) and the second lower shaft grouting hole (2012), and also comprises a lower shaft countersunk hole (2014) located at an upper end thereof and a lower shaft docking cover (2015) located at an outer wall thereof; The upper rotating shaft (202) comprises an upper shaft air supply hole (2023) located therein and an upper shaft shoulder (2024) at the lower end; The sealing gasket (50) comprises a sealing gasket body (500) and three upper convex lip rings (501) with upper steel sleeves (5011); The shaft sleeve (204) comprises a first grouting annular groove (2041) and a second grouting annular groove (2042) located on its inner wall, a plurality of sleeve annular grooves (2043) and sleeve grooves (2044) having oil supply nozzles, a sleeve countersunk hole (2045) located at its upper end, a first grouting hole (20411) and a second grouting hole (20421) located on its outer wall and respectively connected to the first grouting annular groove (2041) and the second grouting annular groove (2042), and also comprises a first locking hole (2046) and a second locking hole (2047) located on its outer wall; The upper cover (205) comprises a first upper cover countersunk hole (2051) and a second upper cover countersunk hole (2052); The lower cover (206) comprises a first lower cover countersunk hole (2061) and a second lower cover countersunk hole (2062); The upper bracket (208) comprises a bracket ring (2081) and a fixed vertical plate (2082) located at one side of the bracket ring; The reduction box (30) comprises a box body (300), a box cover (301), a plurality of hollow main shafts (302) having a first main shaft grouting channel (3021), a second main shaft grouting channel (3022), a main shaft air injection channel (3023) and a main shaft counterbore (3026), and an end ring (306); Features: The hollow main shafts (302) of the reduction box (30) are arranged in a straight line along the transverse direction of the box body (300), and each hollow main shaft (302) is arranged in a manner that both ends extend out of the reduction box (30), and the upper end of each hollow main shaft (302) extends out of the box cover (301) and is located in each end ring (306), and the lower end of each hollow main shaft extends out of the box body (300) and is connected to an external docking flange, a drill rod and a drilling tool; the first main shaft grouting channel (3021), the second main shaft grouting channel (3022), and the main shaft air injection channel (3023) of the hollow main shaft (302) are arranged in a manner that their cross-sectional directions are equilateral triangle symmetrical and their axial directions are parallel to each other, and the upper end surfaces of the first main shaft grouting channel (3021), the second main shaft grouting channel (3022), and the main shaft air injection channel (3023) are all located at the main shaft counterbore (3026) of the hollow main shaft (302); The three upper convex lip rings (501) of the sealing gasket (50) are arranged in an equilateral triangle symmetrical manner on the upper end surface of the sealing gasket body (500), and the upper steel sleeve (5011) is arranged in the hole of the upper convex lip ring (501); the sealing gasket (50) is arranged at the main shaft counterbore (3026) of the hollow main shaft (302), and the three upper convex lip rings (501) of the sealing gasket respectively enter the first lower shaft grouting hole (2011), the second lower shaft grouting hole (2012), and the lower shaft air injection hole (2013) at the lower end of the lower rotating shaft (201); The plurality of pulp-gas rotary joints (20) and pulp-line rotary joints (20') are arranged above each hollow main shaft (302) of the reduction box (30); the plurality of pulp-gas rotary joints (20) and pulp-line rotary joints (20') all pass through the end ring (306) of the reduction box (30) via their lower rotating shafts (201) to reach the upper end of the hollow main shaft (302); The support frame (200) is respectively arranged on the left and right sides of each pulp-gas rotary joint (20) and pulp-line rotary joint (20'); the first stop claw (2006) and the second stop claw (2007) of the support frame are respectively placed in the first locking hole (2046) and the second locking hole (2047) on the outer wall of the rotating shaft sleeve (204) of each pulp-gas rotary joint (20) and pulp-line rotary joint (20'); the support frame flange (2008) is fixedly mounted on each installation position of the box cover (301) of the reduction box (30), so that the plurality of pulp-gas rotary joints (20) and pulp-line rotary joints (20') are fixedly mounted on the upper end of each hollow main shaft (302); The first lower shaft grouting hole (2011), the second lower shaft grouting hole (2012) and the lower shaft air injection hole (2013) of the lower rotating shaft (201) are arranged in a manner that their cross-sectional directions are equilateral triangle symmetrical and their axes are parallel to each other; the first lower shaft grouting hole (2011) and the second lower shaft grouting hole (2012) are respectively connected to the first lower shaft transverse grouting hole (20111) and the second lower shaft transverse grouting hole (20121) in the lower rotating shaft (201); the first lower shaft transverse grouting hole (20111) and the second lower shaft transverse grouting hole (20121) are respectively connected to the first grouting ring groove (20111) of the rotating shaft outer sleeve (204); 41), and the second grouting ring groove (2042); the lower end of the lower rotating shaft (201) is placed in the main shaft counterbore (3026) of the hollow main shaft (302); the first lower shaft grouting hole (2011), the second lower shaft grouting hole (2012), and the lower shaft air injection hole (2013) of the lower rotating shaft are respectively connected to the first main shaft grouting channel (3021), the second main shaft grouting channel (3022), and the main shaft air injection channel (3023) of the hollow main shaft (302); the lower shaft docking cover (2015) is fixedly mounted on the hollow main shaft (302) by screws, so as to connect the lower rotating shaft (201) and the hollow main shaft into one body; The first lower cover countersunk hole (2061) and the second lower cover countersunk hole (2062) of the lower cover (206) are respectively installed with a bearing and a skeleton oil seal, and then sleeved on the installation position on the lower rotating shaft (201); The shaft sleeve (204) is sleeved on the lower shaft (201) and is tightly connected to the lower sleeve cover (206); the sleeve ring groove (2043) and the sleeve groove (2044) are respectively installed with O-rings and filled with grease; the first grouting hole (20411) and the second grouting hole (20421) of the shaft sleeve (204) are respectively connected to the first grouting ring groove (2041) and the second grouting ring groove (2042) in the shaft sleeve (204), and the other ends are respectively connected to external grouting pipelines, and the proportioned cement slurry is pumped into the external grouting system; The upper rotating shaft (202) is placed in the lower shaft counterbore (214) of the lower rotating shaft (201) via its upper shaft shoulder (2024); its upper shaft air supply hole (2023) is arranged obliquely and is connected with the lower shaft air injection hole (213) of the lower rotating shaft (201); the upper end surface of the upper rotating shaft (202) is fixed with a transition joint (209); The upper connecting shaft (207) is placed on the upper end surface of the transition joint (209) through the upper shaft hole shoulder (2071) located at the bottom thereof and then fixed to the upper rotating shaft (202) through screws, thereby connecting the upper connecting shaft (207), the transition joint (209) and the upper rotating shaft (202) into one body; the upper shaft air supply hole (2023) of the upper connecting shaft (207) is connected to the through hole of the transition joint (209) and the upper shaft air supply hole (2023) of the upper rotating shaft (202); The first upper cover countersunk hole (2051) and the second upper cover countersunk hole (2052) of the upper cover (205) are respectively installed with a bearing and a skeleton oil seal, which then pass through the upper connecting shaft (207) and the transition joint (209) and are fixed to the upper end surface of the rotating shaft outer sleeve (204); The upper bracket (208) is fixedly mounted on the upper cover (205) via a bracket ring (2081); the fixed vertical plate (2082) is fixedly mounted on one side of the bracket ring (2081); The rotary gas injection joint (210) of the slurry-gas rotary joint (20) is fixedly mounted on the upper connecting shaft (207); the flow diversion block (2102) is fixedly mounted on the fixed vertical plate (2082); the air supply pipe (2101) connects the rotary gas injection joint (210) and the flow diversion block (2102); The slipping electric ring (211) of the slurry line rotary joint (20') is sleeved on the upper cover (205) through its inner ring; the pressing plate (2113) is fixed to the end face of the slipping electric ring (211), and the other end is fastened to the fixed vertical plate (2082); the inner cable (2111) passes through the through hole of the upper connecting shaft (207), the upper shaft air supply hole (2023) of the upper rotating shaft (202), the lower shaft air injection hole (2013) of the lower rotating shaft (201), and the main shaft air injection channel (3023) of the hollow main shaft (302), and then enters the air pipe of the external drill rod and its drilling tool, and then connects to the tilt sensor.

2. The multi-channel rotary joint assembly according to claim 1, characterized in that The parallelism deviations of the axial center lines between the first main shaft grouting channel (3021), the second main shaft grouting channel (3022) and the main shaft air injection channel (3023) of the hollow main shaft (302), and between the first lower shaft grouting hole (2011), the second lower shaft grouting hole (2012) and the lower shaft air injection hole (2013) of the lower rotating shaft (201) are all 0.08-0.10 mm.

Images