Magnetic water jet in-hole grooving device and using method thereof

Abstract

The invention discloses a magnetic water jet in-hole grooving device and a using method thereof. The magnetic water jet hole inner grooving device comprises a liquid storage tank, a water suction pump, a booster pump, a liquid conveying pipe, a liquid storage pipe handle, an outer sleeve hoop, a limiting plate clamping groove, a tooth-shaped clamping groove, an outer supporting rod, a top resistance plate, two side resistance plates, an outer sleeve, a liquid storage pipe, a limiting plate, a movable lantern ring, a right anti-rotation device hoop, a limiting rod, a liquid inlet, a left anti-rotation device hoop and a magnetic nozzle. The electrolyte NaCl and the high-molecular polymer polyvinyl alcohol are added into the aqueous solution of the liquid storage tank, and meanwhile, the hooping effect of induced current generated by a magnetic field in the solution on jet flow is combined, so that the related problems that a grooving device is prone to abrasion, the jet flow is prone to cavitation, the cutting capacity and precision are not high, and equipment is heavy can be remarkably solved.

Description

Technical Field

[0001] The invention belongs to the technical field of inner grooving of a jet hole, and in particular relates to an inner grooving device of a magnetic water jet hole and a use method thereof. Background Art

[0002] Nowadays, abrasive jet or water jet is often used for cutting hard metal and non-metal materials, tunneling, ore mining, coal tunneling and oil drilling. These two technologies are relatively mature and industrialized in the field of jet cutting. Abrasive jet cutting improves the cutting ability of the jet by adding high-hardness particles to high-pressure water. The high-hardness particles commonly used in the field of abrasive jet are generally ceramsite, quartz sand and corundum. The equipment required for abrasive jet cutting includes an abrasive tank, a water tank, a booster pump and a nozzle. The abrasive tank is relatively large and not suitable for flexible operation. At the same time, during the cutting process, the abrasive will wear the nozzle and other related equipment, causing the nozzle to expand and thus affecting the cutting accuracy and cutting energy. On the one hand, abrasives often block the equipment pipeline. On the other hand, when cutting grooves in the hole, a large amount of abrasives often accumulate in the hole after the groove cutting is completed, and the abrasives need to be cleaned manually, which adds a burden to subsequent operations. The process of mixing abrasives into water will cause a large number of air nuclei to exist in the water, which will easily lead to cavitation in the process of jetting out of the pipe. The cavitation bubbles in the water will generate a large instantaneous pressure when they collapse. When the collapse occurs near the cutting object and the inner surface of the device, the high pressure generated by the continuous collapse of cavitation bubbles in the water flow will repeatedly erode the surface of the cutting object and the inner wall of the pipe, which will cause the surface of the cutting object to be rough and reduce the cutting accuracy.

[0003] Traditional water jet cutting uses water, a liquid with low viscosity. Viscosity can resist the expansion of the velocity difference inside the fluid, so the constant velocity core area of ​​the water jet will be smaller. Compared with the fluid with a larger constant velocity core area, the impact force and cutting ability of the fluid with a larger constant velocity core area will be more uniform and predictable, and the processing accuracy and quality will be higher. At the same time, due to the low viscosity of water, the collapse speed and collapse pressure of the cavitation will be greater during the injection process, which is not conducive to the precise cutting of the jet. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a magnetic water jet hole inner groove cutting device and a use method thereof, which can solve the problems existing in the prior art.

[0005] To solve the above problems, the technical solution provided by the present invention is as follows:

[0006] The embodiment of the present invention provides a magnetic water jet hole internal grooving device, comprising two outer sleeves (12) arranged in parallel, a left anti-rotation device hoop (22) being arranged on one side of the two outer sleeves (12), the left anti-rotation device hoop (22) being connected to four outer support rods (9), a right anti-rotation device hoop (16) and an outer sleeve hoop (6) being arranged on the other side of the two outer sleeves (12), the right anti-rotation device hoop (16) being connected to four outer support rods (9); two side resistance plates (11) and two top resistance plates (10) being connected between the eight outer support rods (9), the two top resistance plates (10) being located outside the two side resistance plates (11);

[0007] A liquid storage tube (13) is arranged between the two outer sleeves (12); one end of the liquid storage tube (13) is provided with a magnetic nozzle (23), and the other end passes through the outer sleeve hoop (6) and is connected to the liquid storage tube handle (5); limit plates (14) are arranged at both ends of the outer sleeve hoop (6), and the end of the limit plate (14) is connected to the right anti-rotation device hoop (16); the liquid storage tube (13) is connected to the booster pump (3), the water pump (2) and the liquid storage tank (1) in sequence through the infusion tube (4).

[0008] In a preferred embodiment of the present invention, the two outer sleeves (12) are provided with toothed slots (8) on the side end surfaces facing the right anti-rotation device hoop (16), and the right anti-rotation device hoop (16) can be rotatably engaged with the toothed slots (8).

[0009] In a preferred embodiment of the present invention, a movable ring (15) is provided on the side end surface of the liquid storage tube (13) facing the left anti-rotation device hoop (22), so as to facilitate the connection of the liquid storage tube (13) to the left anti-rotation device hoop (22).

[0010] In a preferred embodiment of the present invention, a liquid inlet (18) is provided on the side of the liquid storage tube (13) facing the liquid storage tube handle (5).

[0011] In a preferred embodiment of the present invention, two outer sleeves (12) are provided with limit rods (17) on the axial end faces of the right anti-rotation device hoop (16) corresponding to each other, and a limit plate slot (7) is provided on the end face of the right anti-rotation device hoop (16).

[0012] In a preferred embodiment of the present invention, the booster pump (3) is electrically connected to an electromagnetic coil, and the electromagnetic coil is electrically connected to a power source.

[0013] The embodiment of the present invention provides a method for using a magnetic water jet hole cutting device, comprising the following steps:

[0014] Step 1, preparation work before cutting: fill the liquid storage tank (1) with water and add a certain amount of electrolyte NaCl and high molecular polymer polyvinyl alcohol to increase the conductivity and viscosity of the solution, put the magnetic water jet hole cutting device into the hole, then align the limit plate (14) with the limit plate slot (7), push the limit plate (14) to move the right anti-rotation device hoop (16) forward, and the outer support rod (9) hinged on the right anti-rotation device hoop (16) will be opened, and the resistance plates (11) on both sides and the top resistance plate (10) will expand outwards under the push of the outer support rod (9) until they are close to the hole wall, and then the slot of the limit plate (14) is engaged with the toothed slot (8), and the magnetic water jet hole cutting device is firmly fixed in the center of the hole, and then the water pump (2) is used to extract an appropriate amount of solution into the liquid storage tube (13) to wet the entire inner wall of the pipeline;

[0015] Step 2, cutting work: turn on the power of the electromagnetic coil to apply a magnetic field, increase the hydraulic pressure to 40MPa through the booster pump (3), and then transport the solution to the liquid storage pipe (13) through the water pump (2). At this time, the solution is sprayed out from the magnetic nozzle (23) to start cutting the rock. Slowly drag the liquid storage pipe handle (5) to drive the magnetic nozzle (23) located on the liquid storage pipe (13) to perform a reciprocating motion to cut the inner wall of the hole until the cutting depth reaches the set groove cutting depth;

[0016] Step 3, dismantle the magnetic water jet hole grooving device: after the grooving is completed, turn off the water pump (2) and the booster pump (3), and at the same time rotate the limit plate (14) clockwise / counterclockwise out of the range of the limit plate slot (7), take out the limit plate (14), and the anti-rotation device hoop (16) also moves outward, and the resistance plates (11) on both sides and the top resistance plate (10) leave the hole wall. At this time, the magnetic water jet hole grooving device can be taken out of the hole, and the entire cutting work is completed.

[0017] Compared with the prior art, the embodiment of the present invention provides a magnetic water jet hole internal grooving device and a method of using the same, which has the following beneficial effects:

[0018] (1) Compared with traditional water pressure or abrasive jet cutting, the grooving device of the present invention adopts the method of adding electrolyte NaCl to the solution to increase the conductivity and applying a strong magnetic field at the nozzle. When the jet in the nozzle expands and deflects, the jet will cut the magnetic flux lines and generate induced current, so that the magnetic field will form a "hoop effect" on the jet that generates the induced current to inhibit the expansion and deflection of the jet. This design can effectively increase the effective length of the jet, expand the constant flow core area, and significantly improve the penetration ability and cutting accuracy of the jet.

[0019] (2) Compared with conventional water jet cutting, the grooving device of the present invention adds polyvinyl alcohol to the solution to increase the viscosity of the solution, which can effectively increase the jet flow velocity core area and solve the problem that conventional water pressure cutting is prone to cavitation effect, resulting in reduced cutting ability and low cutting accuracy.

[0020] (3) Compared with the traditional cutting device, the grooving device of the present invention adopts the anti-rotation device, which has the following three advantages: a. For grooving in holes with different apertures, the magnetic nozzle can always be located on the center line of the hole, thereby ensuring that the grooving can be accurately located on the plane where the center line of the hole is located. b. During the cutting process, the traditional device is very likely to undergo eccentric rotation under the reaction force of the jet impact force, resulting in grooving deviation. The friction force provided by the resistance plate of the present device after it is tightly fitted to the inner wall of the hole can effectively resist the eccentric rotation during the cutting process. c. With the joint operation of the anti-rotation device and the movable nozzle, the present device can adapt to grooving work in holes with different apertures and different hole depths.

[0021] (4) Compared with the traditional abrasive jet cutting, the grooving device of the present invention can also generate a jet with strong cutting ability without using abrasive particles, and can avoid the problems of abrasive particles easily clogging the pipeline, abrasive jets easily producing cavitation effects, abrasive particles easily wearing the nozzle and reducing the cutting accuracy, abrasive particles being difficult to clean after cutting, and abrasive particle storage tanks being large and difficult to operate flexibly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic overall cross-sectional view of the magnetic water jet hole cutting device when the resistance plate provided in an embodiment of the present application is closed.

[0024] Figure 2 A right view of a magnetic water jet hole cutting device provided in an embodiment of the present application.

[0025] Figure 3 for Figure 1 AA section diagram in .

[0026] Figure 4 for Figure 1 Schematic diagram of the BB cross section.

[0027] Figure 5A schematic diagram of the structure of the magnetic water jet hole cutting device when the resistance plate is opened provided in an embodiment of the present application.

[0028] Figure 6 A front view of a liquid storage tube of a magnetic water jet hole cutting device provided in an embodiment of the present application.

[0029] Figure 7 A right view of a liquid storage tube of a magnetic water jet hole cutting device provided in an embodiment of the present application.

[0030] Figure 8 A front view of an anti-rotation device hoop of a magnetic water jet hole cutting groove device provided in an embodiment of the present application.

[0031] Fig. 9 A schematic diagram of an anti-rotation device hoop and a limit plate of a magnetic water jet hole internal grooving device provided in an embodiment of the present application.

[0032] Figure numerals: 1-liquid storage tank; 2-water pump; 3-boosting pump; 4-infusion tube; 5-liquid storage tube handle; 6-outer sleeve hoop; 7-limit plate slot; 8-toothed slot; 9-outer support rod; 10-top resistance plate; 11-side resistance plates; 12-outer sleeve; 13-liquid storage tube; 14-limit plate; 15-movable ring; 16-right anti-rotation device hoop; 17-limit rod; 18-liquid inlet; 22-left anti-rotation device hoop; 23-magnetic nozzle. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. The "upper", "lower", "front", "rear", "left", "right", etc. used in the installation position or direction of the structure or parts of the present embodiment are based on the orientation of the given drawings. They are only for the convenience of expression to distinguish the relative positions of the components or directions, and do not represent the orientation of the grooving device of the present embodiment when in use.

[0034] like Figures 1 to 9As shown, an embodiment of the present invention provides a magnetic water jet hole inner grooving device, including two outer sleeves 12 arranged in parallel, a left anti-rotation device hoop 22 is arranged on one side of the two outer sleeves 12, the left rotation device hoop 22 is connected to four outer support rods 9, a right anti-rotation device hoop 16 and an outer sleeve hoop 6 are arranged on the other side of the two outer sleeves 12, the right anti-rotation device hoop 16 is connected to four outer support rods 9; two side resistance plates 11 and two top resistance plates 10 are connected between the eight outer support rods 9, and the two top resistance plates 10 are located on the outside of the two side resistance plates 11.

[0035] A liquid storage tube 13 is arranged between the two outer sleeves 12, one end of the liquid storage tube 13 is provided with a magnetic nozzle 23, and the other end passes through the outer sleeve hoop 6 and is connected to the liquid storage tube handle 5; limit plates 14 are arranged at both ends of the outer sleeve hoop 6, and the end of the limit plate 14 is connected to the right anti-rotation device hoop 16; the liquid storage tube 13 is connected to the booster pump 3, the water pump 2 and the liquid storage tank 1 in sequence through the infusion tube 4.

[0036] like Figure 1 and Figure 5 As shown, the two outer sleeves 12 are provided with toothed slots 8 on the side end surfaces facing the right anti-rotation device hoop 16, and the right anti-rotation device hoop 16 can rotate and engage along the toothed slots 8. Figure 6 As shown, a movable collar 15 is provided on the side end surface of the liquid storage tube 13 facing the left anti-rotation device hoop 22, so as to facilitate the connection of the liquid storage tube 13 to the left anti-rotation device hoop 22. Figure 2 As shown, a liquid inlet 18 is provided on the side of the liquid storage tube 13 facing the liquid storage tube handle 5. Figure 3 As shown, the two outer sleeves 12 are provided with limit rods 17 on the axial end faces of the right anti-rotation device hoop 16, and the end faces of the right anti-rotation device hoop 16 are provided with limit plate slots 7. The booster pump 3 of this embodiment is electrically connected to an electromagnetic coil, and the electromagnetic coil is electrically connected to a power source.

[0037] The embodiment of the present invention also provides a method for using the magnetic water jet hole cutting device, comprising the following steps:

[0038] Step 1, preparation before cutting: fill the liquid storage tank 1 with water and add a certain amount of electrolyte NaCl and high molecular polymer polyvinyl alcohol to increase the conductivity and viscosity of the solution, put the magnetic water jet hole grooving device into the hole, then align the limit plate 14 with the limit plate slot 7, push the limit plate 14 to move the right anti-rotation device hoop 16 forward, and the outer support rod 9 hinged on the right anti-rotation device hoop 16 will open accordingly. The resistance plates 11 on both sides and the top resistance plate 10 expand outwards under the push of the outer support rod 9 until they are close to the hole wall, and then the slot of the limit plate 14 is engaged with the toothed slot 8. At this time, the magnetic water jet hole grooving device is firmly fixed in the center of the hole, and then a proper amount of solution is pumped into the liquid storage tube 13 by the water pump 2 to wet the entire inner wall of the pipeline.

[0039] Step 2, cutting work: turn on the power of the electromagnetic coil to apply a magnetic field, increase the hydraulic pressure to 40MPa through the booster pump 3, and then transport the solution to the liquid storage tube 13 through the water pump 2. At this time, the solution is sprayed out from the magnetic nozzle 23 to start cutting the rock. Slowly drag the liquid storage tube handle 5 to drive the magnetic nozzle 23 located on the liquid storage tube 13 to perform a reciprocating motion and cut the inner wall of the hole until the cutting depth reaches the set groove depth.

[0040] Step 3, remove the grooving device inside the magnetic water jet hole: After the grooving is completed, turn off the water pump 2 and the booster pump 3, and rotate the limit plate 14 clockwise / counterclockwise out of the range of the limit plate slot 7, take out the limit plate 14, and the anti-rotation device hoop 16 also moves outward, and the resistance plates 11 on both sides and the top resistance plate 10 leave the hole wall. At this time, the magnetic water jet hole grooving device can be taken out of the hole, and the entire cutting work is completed.

[0041] The present invention adopts the method of adding electrolyte NaCl and high molecular weight polymer polyvinyl alcohol to the aqueous solution of the liquid storage tank, and at the same time combines the "hoop effect" of the induced current generated by the magnetic field in the solution on the jet, which can significantly alleviate the problems related to easy wear of the equipment, easy cavitation of the jet, low cutting ability and precision, and heavy equipment. The present invention adds polyvinyl alcohol to the aqueous solution to increase the viscosity of the water, which can increase the constant velocity flow core area of ​​the jet on the one hand, and effectively inhibit the cavitation effect on the other hand to improve the cutting ability and precision of the jet. Adding electrolyte NaCl to the aqueous solution can improve the conductivity of the solution. The cross section of the jet is equivalent to a series of closed annular loops. When the jet deviates and diffuses in the magnetic field and cuts the magnetic lines of induction, these closed loops will generate induced currents in the magnetic field. The induced current will generate radial forces under the action of the magnetic field to inhibit the deflection and diffusion of the jet. Therefore, it can effectively increase the effective length of the jet and thus improve the penetration ability of the jet. It can be seen that the use of a magnetic field to inhibit the deflection and diffusion of the jet and the use of polyvinyl alcohol to increase the viscosity of the jet are of great engineering significance in the field of jet cutting.

[0042] Although the present invention has been disclosed as above in terms of preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A magnetic water jet hole cutting device, characterized in that: The invention comprises two outer sleeves (12) arranged in parallel, a left anti-rotation device hoop (22) being arranged on one side of the two outer sleeves (12), the left anti-rotation device hoop (22) being connected to four outer support rods (9), a right anti-rotation device hoop (16) and an outer sleeve hoop (6) being arranged on the other side of the two outer sleeves (12), the right anti-rotation device hoop (16) being connected to four outer support rods (9); two side resistance plates (11) and two top resistance plates (10) being connected between the eight outer support rods (9), the two top resistance plates (10) being located outside the two side resistance plates (11); A liquid storage tube (13) is arranged between the two outer sleeves (12); one end of the liquid storage tube (13) is provided with a magnetic nozzle (23), and the other end passes through the outer sleeve hoop (6) and is connected to the liquid storage tube handle (5); limit plates (14) are arranged at both ends of the outer sleeve hoop (6), and the end of the limit plate (14) is connected to the right anti-rotation device hoop (16); the liquid storage tube (13) is connected to the booster pump (3), the water pump (2) and the liquid storage tank (1) in sequence through the infusion tube (4).

2. A magnetic water jet hole cutting device according to claim 1, characterized in that: The two outer sleeves (12) are provided with toothed slots (8) on the side end surfaces facing the right anti-rotation device sleeve (16), and the right anti-rotation device sleeve (16) can be rotatably engaged with the toothed slots (8).

3. A magnetic water jet hole cutting device according to claim 2, characterized in that: A movable collar (15) is provided on the side end surface of the liquid storage tube (13) facing the left anti-rotation device collar (22) to facilitate the connection of the liquid storage tube (13) to the left anti-rotation device collar (22).

4. A magnetic water jet hole cutting device according to claim 3, characterized in that: A liquid inlet (18) is provided on the side of the liquid storage tube (13) facing the liquid storage tube handle (5).

5. A magnetic water jet hole cutting device according to claim 4, characterized in that: The two outer sleeves (12) are provided with limit rods (17) on the axial end surfaces of the right anti-rotation device sleeve (16) correspondingly facing the right anti-rotation device sleeve (16), and the end surface of the right anti-rotation device sleeve (16) is provided with a limit plate slot (7).

6. A magnetic water jet hole cutting device according to claim 5, characterized in that: The boost pump (3) is electrically connected to an electromagnetic coil, and the electromagnetic coil is electrically connected to a power source.

7. A method for using the magnetic water jet hole cutting device as claimed in claim 6, characterized in that: The following steps are involved: Step 1, preparation work before cutting: fill the liquid storage tank (1) with water and add a certain amount of electrolyte NaCl and high molecular polymer polyvinyl alcohol to increase the conductivity and viscosity of the solution, put the magnetic water jet hole cutting device into the hole, then align the limit plate (14) with the limit plate slot (7), push the limit plate (14) to move the right anti-rotation device hoop (16) forward, and the outer support rod (9) hinged on the right anti-rotation device hoop (16) will be opened, and the resistance plates (11) on both sides and the top resistance plate (10) will expand outwards under the push of the outer support rod (9) until they are close to the hole wall, and then the slot of the limit plate (14) is engaged with the toothed slot (8), and the magnetic water jet hole cutting device is firmly fixed in the center of the hole, and then the water pump (2) is used to extract an appropriate amount of solution into the liquid storage tube (13) to wet the entire inner wall of the pipeline; Step 2, cutting work: turn on the power of the electromagnetic coil to apply a magnetic field, increase the hydraulic pressure to 40MPa through the booster pump (3), and then transport the solution to the liquid storage pipe (13) through the water pump (2). At this time, the solution is sprayed out from the magnetic nozzle (23) to start cutting the rock. Slowly drag the liquid storage pipe handle (5) to drive the magnetic nozzle (23) located on the liquid storage pipe (13) to perform a reciprocating motion to cut the inner wall of the hole until the cutting depth reaches the set groove cutting depth; Step 3, dismantle the magnetic water jet hole grooving device: after the grooving is completed, turn off the water pump (2) and the booster pump (3), and at the same time rotate the limit plate (14) clockwise / counterclockwise out of the range of the limit plate slot (7), take out the limit plate (14), and the anti-rotation device hoop (16) also moves outward, and the resistance plates (11) on both sides and the top resistance plate (10) leave the hole wall. At this time, the magnetic water jet hole grooving device can be taken out of the hole, and the entire cutting work is completed.

Images