Electric explosion spraying device for preparing inner wall coating of small-diameter metal pipes

Abstract

The present invention provides an electric explosion spraying device for preparing coatings on the inner walls of small-diameter metal pipes, which relates to the field of electric explosion spraying. The device comprises a low-voltage conductive pipe connected to the low-voltage end of a capacitor; a metal pipe driving mechanism for driving the metal pipe to move axially along the interior of the low-voltage conductive pipe; a low-voltage electrode provided on the metal pipe driving mechanism; a high-voltage conductive pipe connected to the high-voltage end of the capacitor, and a high-voltage electrode provided at its end; a certain distance between the low-voltage electrode and the high-voltage electrode; and an automatic wire feeding mechanism assembled in the high-voltage conductive pipe and capable of gradually feeding the metal wire. When the metal wire moves between the low-voltage electrode and the high-voltage electrode, the capacitor discharges, forming an electric field between the low-voltage electrode and the high-voltage electrode, and directing current to the metal wire, thereby achieving electric explosion spraying at the corresponding position on the inner wall of the metal pipe. The electric explosion spraying device can achieve long-distance stable automatic wire feeding, meeting the demand for coating the inner wall of small-diameter metal pipes.

Description

Technical Field

[0001] The invention relates to the technical field of electric explosion spraying, in particular to an electric explosion spraying device for preparing inner wall coatings of small-caliber metal pipes. Background Art

[0002] Traditional hot and cold spraying methods struggle to produce high-quality coatings on the interior walls of tubes and holes with diameters less than 40 mm, significantly limiting their application in heat exchange tube fabrication. Furthermore, existing electric explosion methods struggle to scale up for production, with the primary drawback being the difficulty in delivering the explosive material (wire or powder) into the electric field. Other in-tube coating techniques, such as plasma spraying, supersonic flame spraying, and arc spraying, require tubes with diameters of at least 100 mm. Therefore, developing a spraying device capable of rapidly and precisely applying energy to coating materials within a confined space to create coatings is a new challenge facing the thermal spray industry.

[0003] Although the existing electric explosion spraying device can prepare coatings on the inner wall of a pipe in a narrow space, it still has the following shortcomings: 1. The existing electric explosion spraying device cannot achieve long-distance stable continuous spraying in a metal pipe with an inner diameter of 40mm. 2. The metal wire of the existing electric explosion equipment uses a carrier wire for continuous wire feeding, but the surface of the carrier wire needs to be melted and then bonded to the metal wire. Each bonding process is cumbersome and time-consuming. 3. The existing equipment cannot feed wire over long distances, and the wire feeding power source is close to the place where the electric explosion occurs, which can easily cause unstable wire feeding. 4. The existing equipment uses metal contact for electrical conduction, which is dangerous to use. Summary of the Invention

[0004] In response to the above-mentioned technical defects, the present invention provides an electric explosion spraying device for preparing inner wall coatings of small-diameter metal pipes, which can achieve long-distance stable and continuous wire feeding, and adopts air breakdown to achieve electric explosion spraying, thereby achieving long-distance stable and continuous spraying in metal pipes with an inner diameter of 40mm.

[0005] Specifically, the present invention provides an electric explosion spraying device for preparing inner wall coating of a small-caliber metal pipe, comprising:

[0006] A low-voltage conductive tube connected to the low-voltage end of the capacitor, into which the metal tube to be sprayed can extend;

[0007] a metal tube drive mechanism connected to the metal tube and used to drive the metal tube to move axially along the interior of the low-voltage conductive tube; a low-voltage electrode is provided on the metal tube drive mechanism, and during the movement of the metal tube, the low-voltage electrode does not move axially relative to the low-voltage conductive tube;

[0008] A high-voltage conductive tube connected to the high-voltage end of the capacitor, with a high-voltage electrode provided at its end; a certain distance exists between the low-voltage electrode and the high-voltage electrode;

[0009] An automatic wire feeding mechanism, which is assembled in the high-voltage conductive tube and can reciprocate along the axial direction of the high-voltage conductive tube to achieve gradual feeding of the metal wire;

[0010] When the metal wire moves between the low-voltage electrode and the high-voltage electrode, the capacitor discharges, forming an electric field between the low-voltage electrode and the high-voltage electrode, and directing current to the metal wire to achieve electric explosion spraying at the corresponding position of the inner wall of the metal tube.

[0011] As a further illustration of the present invention, the automatic wire feeding mechanism includes:

[0012] A wire guide tube, which is inserted into the high-voltage conductive tube and can reciprocate along the axial direction of the high-voltage conductive tube under the action of a reciprocating drive mechanism;

[0013] A wire feeding tube is arranged in the high-voltage conductive tube, with one end of the wire feeding tube inserted into the wire guide tube and the other end capable of passing through the high-voltage electrode;

[0014] A metal wire clamping mechanism, which is arranged in the wire guide tube and connected to the end of the wire feeding tube;

[0015] The metal wire is sequentially inserted into the wire guide tube, the wire clamping mechanism and the wire feeding tube; during the movement of the wire guide tube toward the end close to the high-voltage electrode, the wire clamping mechanism can clamp the metal wire so that it follows the wire feeding tube to move between the low-voltage electrode and the high-voltage electrode; during the movement of the wire guide tube toward the end away from the high-voltage electrode, the wire clamping mechanism releases the metal wire to keep the metal wire stationary.

[0016] As a further illustration of the present invention, when the wire guide tube reciprocates once, the length of the metal wire passing through the high-voltage conductive tube is exactly the same as the distance between the high-voltage electrode and the low-voltage electrode.

[0017] As a further illustration of the present invention, the wire clamping mechanism includes a wire clamping nozzle and a limiting rod of an annular structure, wherein the limiting rod is fixed in the wire guide tube, the wire clamping nozzle can slide along the inside of the wire guide tube, one end of the wire clamping nozzle is connected to the wire feeding tube, and the other tip can be inserted into the limiting rod;

[0018] When the tip of the wire clamping nozzle is inserted into the limiting rod, the tip is squeezed and gradually closed until the wire is clamped. When the tip of the wire clamping nozzle is withdrawn from the limiting rod, the tip gradually opens until the wire is released.

[0019] As a further illustration of the present invention, a through hole is provided at the center of the high voltage electrode, and a rubber damping ring is installed in the through hole; the wire feeding tube and the rubber damping ring are tightly fitted;

[0020] During the movement of the wire guide tube toward the end close to the high-voltage electrode, the wire feeding tube is subjected to the resistance of the rubber damping ring, driving the tip of the wire clamping nozzle to insert into the limit rod; during the movement of the wire guide tube toward the end away from the high-voltage electrode, the wire feeding tube is subjected to the reverse resistance of the rubber damping ring, driving the tip of the wire clamping nozzle to exit the limit rod.

[0021] As a further illustration of the present invention, the metal tube driving mechanism includes:

[0022] A trapezoidal lead screw capable of rotating under the drive of a motor; the low-voltage electrode is connected to one end of the trapezoidal lead screw close to the high-voltage electrode;

[0023] a nut, which is assembled on the trapezoidal lead screw and fixedly connected to the end of the metal tube;

[0024] A metal tube limiting mechanism, which is used to limit the rotational displacement of the metal tube so that it can only move axially inside the low-voltage conductive tube;

[0025] During the rotation of the trapezoidal lead screw, the nut drives the metal tube to move axially along the interior of the low-voltage conductive tube.

[0026] As a further illustration of the present invention, the metal tube limiting mechanism includes a tightening belt and a metal tube tightening mechanism, and the metal tube tightening mechanism is composed of a fisheye bolt, a nut and a metal tube tightening sleeve;

[0027] A through slot is formed in the low-voltage conductive tube along its axial direction, the metal tube tightening sleeve is slidably connected to the through slot, the fisheye bolt is assembled in the metal tube tightening sleeve, and the upper end bolt portion thereof penetrates the metal tube tightening sleeve and extends above the metal tube tightening sleeve;

[0028] The tightening band is passed through the lower end connecting ring of the fisheye bolt and then wrapped around the metal pipe. The fisheye bolt can cooperate with the nut connected to its upper end to make the tightening band pull the metal pipe upward, thereby making the metal pipe and the metal pipe tightening sleeve move synchronously axially along the low-voltage conductive pipe.

[0029] As a further illustration of the present invention, both the low-voltage electrode and the high-voltage electrode are of an inner conical structure, and a gas release channel is further provided on the side of the low-voltage electrode.

[0030] As a further illustration of the present invention, an insulating protective cover is provided at the end of the high-voltage electrode; a plastic sleeve is provided between the low-voltage electrode and the metal tube drive mechanism;

[0031] The high-voltage electrode and the outer wall of the high-voltage conductive tube are both wrapped with a heat shrink tube for high-voltage insulation protection.

[0032] As a further illustration of the present invention, there is a gap between the low-voltage electrode and the inner wall of the metal tube, and there is a gap between the metal tube and the inner wall of the low-voltage conductive tube.

[0033] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0034] 1. In the present invention, the electric explosion spraying device realizes conduction between the low-voltage conductive tube, the metal tube and the low-voltage electrode and the metal wire by breaking down the gap with a large current. By breaking down the air, the low-voltage conductive tube, the metal tube and the low-voltage electrode can move without interfering with each other, thereby achieving stability in the operation of the equipment.

[0035] 2. In the present invention, the electric explosion spraying device realizes automatic wire feeding through an automatic wire feeding mechanism in conjunction with a high-voltage conductive tube, eliminating the need for the cumbersome operation of using a carrier wire, and can achieve long-distance stable wire feeding, thereby improving safety and durability, having fewer parts, and being easy to install and use.

[0036] Other features and advantages of this technical solution will be described in the subsequent description, and in part will become apparent from the description, or understood by practicing this technical solution. The objectives and other advantages of this technical solution can be achieved and obtained through the structures specifically pointed out in the written description and the accompanying drawings.

[0037] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide a further understanding of the present technical solution and constitute a part of the specification. Together with the embodiments of the present technical solution, they are used to explain the present technical solution and do not constitute a limitation of the present technical solution. In the accompanying drawings:

[0039] Figure 1 A schematic diagram of the overall structure of the electric explosion spraying device provided by the present invention for preparing the inner wall coating of a small-caliber metal pipe;

[0040] Figure 2 A schematic cross-sectional view of an electric explosion spraying device for preparing inner wall coatings of small-caliber metal pipes provided by the present invention;

[0041] Figure 3 A schematic structural diagram of the automatic wire feeding mechanism provided by the present invention;

[0042] Figure 4 A schematic diagram of the metal tube tightening mechanism provided by the present invention;

[0043] Figure 5 A schematic diagram of the inner cone low-voltage electrode structure provided by the present invention;

[0044] Figure 6 This is a schematic diagram of the high-voltage electrode structure provided by the present invention.

[0045] Description of reference numerals:

[0046] Trapezoidal screw 1, nut 2, low-voltage conductive tube 3, tightening belt 4, metal tube tightening mechanism 5, fisheye bolt 501, nut 502, metal tube tightening sleeve 503, insulating protective cover 6, wire clamping nozzle 7, limit rod 8, metal tube 9, plastic sleeve 10, low-voltage electrode 11, high-voltage electrode 12, heat shrink tube 13, high-voltage conductive tube 14, wire guide tube 15, through groove 17, air release channel 18, through hole 19, electric explosion chamber 20, wire feeding tube 21, rubber damping ring 22, metal wire 23. DETAILED DESCRIPTION

[0047] The preferred embodiments of the present technical solution are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present technical solution and are not used to limit the present technical solution.

[0048] like Figures 1-6 As shown, the present invention provides an electric explosion spraying device for preparing a coating on the inner wall of a small-diameter metal tube, comprising: a low-voltage conductive tube 3, which is connected to the low-voltage end of a capacitor, and a metal tube 9 to be sprayed can be inserted into the low-voltage conductive tube 3; a metal tube driving mechanism, which is connected to the metal tube 9 and is used to drive the metal tube 9 to move axially along the inside of the low-voltage conductive tube 3; a low-voltage electrode 11 is provided on the metal tube driving mechanism, and during the movement of the metal tube 9, the low-voltage electrode 11 does not move axially relative to the low-voltage conductive tube 3; a high-voltage conductive tube 14, which is connected to the capacitor The high-voltage end of the metal tube 9 is provided with a high-voltage electrode 12 at its end; there is a certain spacing distance between the low-voltage electrode 11 and the high-voltage electrode 12; an automatic wire feeding mechanism is assembled in the high-voltage conductive tube 14 and can move back and forth along the axial direction of the high-voltage conductive tube 14 to realize the gradual feeding of the metal wire 23; when the metal wire 23 moves between the low-voltage electrode 11 and the high-voltage electrode 12, the capacitor discharges, so that an electric field is formed between the low-voltage electrode 11 and the high-voltage electrode 12, and the current is introduced into the metal wire 23, thereby realizing electric explosion spraying at the corresponding position of the inner wall of the metal tube 9.

[0049] It should be noted that the "low voltage" defined in the low-voltage conductive tube 3 and low-voltage electrode 11 in the present invention only indicates that they are electrically connected to the low-voltage terminal of the capacitor, while the "high voltage" defined in the high-voltage conductive tube 14 and high-voltage electrode 12 only indicates that they are electrically connected to the high-voltage terminal of the capacitor. The low-voltage terminal of the capacitor is its ground terminal, and the voltage at the high-voltage terminal of the capacitor must be maintained at or above 8 kV.

[0050] Furthermore, there is a gap between the low-voltage electrode 11 and the inner wall of the metal tube 9, preferably 1-2 mm. There is also a gap between the metal tube 9 and the inner wall of the low-voltage conductive tube 3, preferably 1-2 mm. The distance between the low-voltage electrode 11 and the high-voltage electrode 12 is preferably 60-70 mm.

[0051] This electric explosion spray device achieves electrical continuity between the low-voltage conductive tube, the metal tube, the low-voltage electrode, and the metal wire by breaking down gaps (the gap between the low-voltage conductive tube and the metal tube, and the gap between the metal tube and the low-voltage electrode) with a high current. Breaking down air prevents the low-voltage conductive tube, the metal tube, and the low-voltage electrode from interfering with each other, thus ensuring stable operation. This electric explosion spray device eliminates the cumbersome bonding process of a carrier wire. Instead, it utilizes an automatic wire feeding mechanism in conjunction with the high-voltage conductive tube to achieve stable, long-distance automatic wire feeding, improving safety and durability. It also has fewer parts and is easy to install and use. Therefore, the electric explosion spray device provided by the present invention is capable of achieving stable, continuous spraying over long distances within a metal tube with an inner diameter of 40 mm.

[0052] Specifically, the above-mentioned automatic wire feeding mechanism includes: a wire guide tube 15, which is inserted into the high-voltage conductive tube 14 and can reciprocate along the axial direction of the high-voltage conductive tube 14 under the action of the reciprocating drive mechanism; a wire feeding tube 21, which is arranged in the high-voltage conductive tube 14, and one end of which is inserted into the wire guide tube 15, and the other end can penetrate the high-voltage electrode 12; a wire clamping mechanism, which is arranged in the wire guide tube 15 and connected to the end of the wire feeding tube 21; the metal wire 23 is inserted into the wire guide tube 15, the wire clamping mechanism and the wire feeding tube 21 in sequence; when the wire guide tube 15 moves toward the end close to the high-voltage electrode 12, the wire clamping mechanism can clamp the metal wire 23 so that it follows the wire feeding tube 21 to move between the low-voltage electrode 11 and the high-voltage electrode 12; when the wire guide tube 15 moves toward the end away from the high-voltage electrode 12, the wire clamping mechanism releases the metal wire 23 to keep the metal wire 23 stationary.

[0053] Furthermore, the reciprocating drive mechanism for driving the wire guide tube 15 to reciprocate along the axial direction of the high-voltage conductive tube 14 may be a crank-connecting rod mechanism, or other drive structures capable of achieving reciprocating motion.

[0054] Specifically, the wire clamping mechanism includes a wire clamping nozzle 7 and a limiting rod 8 of an annular structure. The limiting rod 8 is fixed in the wire guide tube 15. The wire clamping nozzle 7 can slide along the inside of the wire guide tube 15. One end of the wire clamping nozzle 7 is connected to the wire feeding tube 21, and the other tip can be inserted into the limiting rod 8. During the process of the tip of the wire clamping nozzle 7 being inserted into the limiting rod 8, the tip is squeezed and gradually closed until the wire 23 is clamped. During the process of the tip of the wire clamping nozzle 7 withdrawing from the limiting rod 8, the tip gradually opens until the wire 23 is released. Furthermore, one end of the wire clamping nozzle 7 is specifically connected to the wire feeding tube 21 by an interference fit; the limiting rod 8 is preferably a ceramic rod.

[0055] Specifically, a through hole 19 is provided at the center of the high-voltage electrode 12, and a rubber damping ring 22 is assembled in the through hole 19; the wire feeding tube 21 and the rubber damping ring 22 are tightly fitted; in the process of the wire guide tube 15 moving toward the end close to the high-voltage electrode 12, due to the friction between the rubber damping ring 22 and the wire feeding tube 21, the wire feeding tube 21 is subjected to the resistance of the rubber damping ring 22, driving the tip of the wire clamping nozzle 7 to insert into the limit rod 8; in the process of the wire guide tube 15 moving toward the end away from the high-voltage electrode 12, the wire feeding tube 21 is subjected to the reverse resistance of the rubber damping ring 22, driving the tip of the wire clamping nozzle 7 to exit the limit rod 8.

[0056] Preferably, the wire guide tube 15 reciprocates once, and the length of the metal wire 23 passing through the high-voltage conductive tube 14 is exactly consistent with the distance between the high-voltage electrode 12 and the low-voltage electrode 11.

[0057] Specifically, the metal tube driving mechanism includes: a trapezoidal screw 1, which can rotate under the drive of a motor; a low-voltage electrode 11 is connected to one end of the trapezoidal screw 1 close to the high-voltage electrode 12; a nut 2, which is assembled on the trapezoidal screw 1 and is fixedly connected to the end of the metal tube 9; a metal tube limiting mechanism, which is used to limit the rotational displacement of the metal tube 9 so that it can only move axially along the inside of the low-voltage conductive tube 3; during the rotation of the trapezoidal screw 1, the nut 2 drives the metal tube 9 to move axially along the inside of the low-voltage conductive tube 3.

[0058] More specifically, the metal tube limiting mechanism includes a tightening belt 4 and a metal tube tightening mechanism 5, and the metal tube tightening mechanism 5 is composed of a fisheye bolt 501, a nut 502 and a metal tube tightening sleeve 503; a through groove 17 is opened on the low-voltage conductive tube 3 along its axial direction, and the metal tube tightening sleeve 503 is slidably connected to the through groove 17, and the fisheye bolt 501 is assembled in the metal tube tightening sleeve 503, and its upper end bolt portion passes through the metal tube tightening sleeve 503 and extends above it; the tightening belt 4 passes through the lower end connecting ring of the fisheye bolt 501 and is wrapped around the metal tube 9. The fisheye bolt 501 can cooperate with the nut 502 connected to its upper end to make the tightening belt 4 pull the metal tube 9 upward, so that the metal tube 9 and the metal tube tightening sleeve 503 move synchronously axially along the low-voltage conductive tube 3.

[0059] The trapezoidal screw 1 rotates under the drive of the motor, driving the nut 2 to rotate. The nut 2 is tightly connected to the metal tube 9. Since the metal tube 9 is constrained by the tightening mechanism 5, the nut 2 drives the metal tube 9 to move axially along the low-voltage conductive tube 3 (trapezoidal screw 1).

[0060] Preferably, an insulating protective cover 6 is provided at the end of the high-voltage electrode 12; a plastic sleeve 10 is provided between the low-voltage electrode 11 and the metal tube driving mechanism; the outer walls of the high-voltage electrode 12 and the high-voltage conductive tube 14 are both wrapped with a heat shrink tube 13 for high-voltage insulation protection; and the high-voltage electrode 12 and the high-voltage conductive tube 14 are specifically connected by an interference fit.

[0061] The plastic sleeve 10 and insulating protective cover 6 are preferably made of high-molecular-weight polyethylene, which exhibits excellent heat resistance, electrical insulation, and chemical stability. Furthermore, they exhibit excellent hardness, rigidity, mechanical strength, and toughness. Furthermore, they are easily reprocessable and recyclable upon melting, making them a typical environmentally friendly material. Specifically, the plastic sleeve 10 is connected between the low-voltage electrode 11 and the lead screw 1. The low-voltage electrode 11 blocks the flow of current through the plastic sleeve 10, providing insulation and protection for the rear end of the lead screw 1.

[0062] Preferably, both the low-voltage electrode 11 and the high-voltage electrode 12 are of inner conical structure, and a venting channel 18 is also provided on the side of the low-voltage electrode 11. Previous studies have found that during the electric explosion process, energy is concentrated in the middle of the metal wire, and the energy at both ends is relatively low, which easily forms large particle spraying, resulting in uneven spraying effect. The inner conical structure can prevent large particles at both ends of the metal wire from being deposited on the metal tube 9 to form an uneven coating. Later, only the low-voltage electrode 11 and the insulating protective cover 6 need to be replaced. The shock wave generated during the electric explosion process causes a large pressure difference between the electric explosion chamber and the outside world. In order to reduce the impact of the pressure difference on the operation of the equipment, a venting channel 18 that can release pressure is opened on the side of the low-voltage electrode 11 along its axial direction, so that the gas can be effectively discharged and the stable use of the explosion chamber can be protected.

[0063] It should be noted that the above-mentioned trapezoidal screw 1, low-voltage electrode 11, high-voltage electrode 12, insulating protective cover 6, high-voltage conductive tube 14 and other components can be extended into the interior of the metal tube 9 without interfering with each other; the positions of the low-voltage electrode 11, high-voltage electrode 12, trapezoidal screw 1, low-voltage conductive tube 3 and high-voltage conductive tube 14 are all fixed, and only the metal tube 9 can reciprocate inside the low-voltage conductive tube 3 under the action of the trapezoidal screw 1, and the metal wire 23 can be fed under the action of the automatic wire feeding mechanism, and gradually fed into the space between the low-voltage electrode 11 and the high-voltage electrode 12 to realize electric explosion spraying.

[0064] It should be noted that when the metal wire 23 enters between the high-voltage electrode 12 and the low-voltage electrode 11 , a small gap exists between the high-voltage electrode 12 , the low-voltage electrode 11 and the metal wire 23 .

[0065] The electric explosion spraying device provided by the present invention is used for preparing the inner wall coating of a small-caliber metal pipe. The automatic wire feeding and electric explosion spraying process are specifically as follows:

[0066] After the metal wire 23 passes through the wire guide tube 15 and passes through the wire clamping nozzle 7 and the wire feeding tube 21, the crank connecting rod mechanism drives the wire guide tube 15 to move to the left. When the wire guide tube 15 moves to a certain position to the left, mutual resistance occurs between the wire feeding tube 21 connected to the front end of the wire clamping nozzle 7 and the rubber damping ring 22. The wire feeding tube 21 causes the wire clamping nozzle 7 to move to the right relative to the wire guide tube 15 and contact the limit rod 8, and squeeze it. The wire clamping nozzle 7 closes and clamps the metal wire 23. Subsequently, the wire clamping nozzle 7 clamps the metal wire 23 and moves to the left along the wire guide tube 15 Movement, when it reaches the designated position (electric explosion chamber 20) between the high-voltage electrode 12 and the low-voltage electrode 11, the crank-connecting rod mechanism drives the wire guide tube 15 to move to the right, and an opposite resistance occurs between the wire feeding tube 21 connected to the front end of the wire clamping nozzle 7 and the rubber damping ring 22, causing the wire clamping nozzle 7 to move to the left relative to the limit rod 8. The wire clamping nozzle 7 gradually opens, and the metal wire 23 is no longer clamped, so it no longer follows the wire clamping nozzle 7 to move to the right. At this time, the wire guide tube 15 drives the wire clamping nozzle 7 and the wire feeding tube 21 to continue to move to the right until the reset is completed. The crank-connecting rod mechanism drives the wire guide tube 15 and the wire clamping nozzle 7 to repeat the above movement process, and automatic wire feeding can be achieved.

[0067] At the same time, the motor drives the trapezoidal screw 1 to rotate, and the nut 2 drives the metal tube 9 to self-rotate. Since the metal tube 9 is fixed together with the metal tube tightening mechanism 5, and the metal tube tightening sleeve 503 on the metal tube tightening mechanism 5 can only slide along the through groove 17 on the low-voltage conductive tube 3, under the condition of axial constraint, the nut 2 and the metal tube 9 cannot self-rotate and can only move linearly along the trapezoidal screw 1, thereby extending into the low-voltage conductive tube 3 until the part to be sprayed is located between the high-voltage electrode 12 and the low-voltage electrode 11, and then stops moving. At this time, the internal space of the metal tube 9 between the high-voltage electrode 12 and the low-voltage electrode 11 forms an electric explosion chamber 20.

[0068] When the metal wire 23 moves between the low-voltage electrode 11 and the high-voltage electrode 12 under the action of the automatic wire feeding mechanism, and the part of the metal tube 9 to be sprayed also moves between the high-voltage electrode 12 and the low-voltage electrode 11, the capacitor discharges, reaches the high-voltage electrode 12 through the high-voltage conductive tube 14, and breaks through the gap between the low-voltage conductive tube 3 and the metal tube 9 and the gap between the metal tube 9 and the low-voltage electrode 11 through the low-voltage conductive tube 3 to reach the low-voltage electrode 11. An electric field is formed between the low-voltage electrode 11 and the high-voltage electrode 12, and a large current is introduced into the metal wire 23 by breaking through the gap between the metal wire 23 and the two electrodes, thereby realizing electric explosion.

[0069] Obviously, those skilled in the art may make various changes and modifications to this technical solution without departing from the spirit and scope of this technical solution. Thus, if these modifications and variations of this technical solution fall within the scope of the claims of this technical solution and their equivalents, this technical solution is intended to include these modifications and variations.

Claims

1. An electric explosion spraying device for preparing inner wall coating of small-caliber metal pipes, characterized in that: include: A low-voltage conductive tube (3) connected to the low-voltage end of the capacitor, wherein the metal tube (9) to be sprayed can extend into the low-voltage conductive tube (3); a metal tube driving mechanism connected to the metal tube (9) and used to drive the metal tube (9) to move axially inside the low-voltage conductive tube (3); a low-voltage electrode (11) is provided on the metal tube driving mechanism, and during the movement of the metal tube (9), the low-voltage electrode (11) does not move axially relative to the low-voltage conductive tube (3); A high-voltage conductive tube (14) is connected to the high-voltage end of the capacitor, and a high-voltage electrode (12) is provided at its end; a certain distance exists between the low-voltage electrode (11) and the high-voltage electrode (12); An automatic wire feeding mechanism, which is assembled in the high-voltage conductive tube (14) and can reciprocate along the axial direction of the high-voltage conductive tube (14) to achieve gradual feeding of the metal wire (23); The automatic wire feeding mechanism comprises: A wire guide tube (15) is inserted into the high-voltage conductive tube (14) and is capable of reciprocating along the axial direction of the high-voltage conductive tube (14) under the action of a reciprocating drive mechanism; A wire feeding tube (21), which is arranged in the high-voltage conductive tube (14), and one end of which is inserted into the wire guide tube (15), and the other end of which is capable of passing through the high-voltage electrode (12); A metal wire clamping mechanism, which is arranged in the wire guide tube (15) and connected to the end of the wire feeding tube (21); The wire clamping mechanism includes a wire clamping nozzle (7) and a limiting rod (8) of an annular structure, wherein the limiting rod (8) is fixed in the wire guide tube (15), and the wire clamping nozzle (7) can slide along the inside of the wire guide tube (15), one end of the wire clamping nozzle (7) is connected to the wire feeding tube (21), and the other tip can be inserted into the limiting rod (8); A through hole (19) is provided at the center of the high-voltage electrode (12), and a rubber damping ring (22) is installed in the through hole (19); the wire feeding tube (21) and the rubber damping ring (22) are tightly fitted; When the metal wire (23) moves between the low-voltage electrode (11) and the high-voltage electrode (12), the capacitor discharges, forming an electric field between the low-voltage electrode (11) and the high-voltage electrode (12), and directing current to the metal wire (23), thereby achieving electric explosion spraying at a corresponding position on the inner wall of the metal tube (9).

2. The electric explosion spraying device for preparing inner wall coating of small-diameter metal pipe according to claim 1, characterized in that: The metal wire (23) is sequentially inserted into the wire guide tube (15), the wire clamping mechanism and the wire feeding tube (21); when the wire guide tube (15) moves toward one end close to the high-voltage electrode (12), the wire clamping mechanism can clamp the metal wire (23) so that it follows the wire feeding tube (21) and moves between the low-voltage electrode (11) and the high-voltage electrode (12); when the wire guide tube (15) moves toward one end away from the high-voltage electrode (12), the wire clamping mechanism releases the metal wire (23) so that the metal wire (23) remains stationary.

3. The electric explosion spraying device for preparing inner wall coating of small-caliber metal pipe according to claim 2, characterized in that: The wire guide tube (15) reciprocates once, and the length of the metal wire (23) passing through the high-voltage conductive tube (14) is exactly the same as the distance between the high-voltage electrode (12) and the low-voltage electrode (11).

4. The electric explosion spraying device for preparing inner wall coating of small-caliber metal pipe according to claim 2, characterized in that: During the process of the tip of the wire clamping mouth (7) being inserted into the limiting rod (8), the tip is squeezed and gradually closed until the metal wire (23) is clamped; during the process of the tip of the wire clamping mouth (7) being withdrawn from the limiting rod (8), the tip gradually opens until the metal wire (23) is released.

5. The electric explosion spraying device for preparing inner wall coating of small-caliber metal pipe according to claim 1, characterized in that: During the movement of the wire guide tube (15) toward the end close to the high-voltage electrode (12), the wire feeding tube (21) is subjected to the resistance of the rubber damping ring (22), driving the tip of the wire clamping nozzle (7) to be inserted into the limiting rod (8); during the movement of the wire guide tube (15) toward the end away from the high-voltage electrode (12), the wire feeding tube (21) is subjected to the reverse resistance of the rubber damping ring (22), driving the tip of the wire clamping nozzle (7) to exit the limiting rod (8).

6. The electric explosion spraying device for preparing inner wall coating of small-caliber metal pipe according to claim 1, characterized in that: The metal tube driving mechanism comprises: A trapezoidal lead screw (1) capable of rotating under the drive of a motor; the low-voltage electrode (11) is connected to one end of the trapezoidal lead screw (1) close to the high-voltage electrode (12); A nut (2) assembled on the trapezoidal lead screw (1) and fixedly connected to the end of the metal tube (9); A metal tube limiting mechanism, which is used to limit the rotational displacement of the metal tube (9) so that it can only move axially inside the low-voltage conductive tube (3); During the rotation of the trapezoidal lead screw (1), the nut (2) drives the metal tube (9) to move axially along the interior of the low-voltage conductive tube (3).

7. The electric explosion spraying device for preparing inner wall coating of small-caliber metal pipe according to claim 6, characterized in that: The metal tube limiting mechanism comprises a tightening belt (4) and a metal tube tightening mechanism (5), wherein the metal tube tightening mechanism (5) is composed of a fisheye bolt (501), a nut (502) and a metal tube tightening sleeve (503); A through slot (17) is provided on the low-voltage conductive tube (3) along its axial direction, the metal tube tightening sleeve (503) is slidably connected to the through slot (17), the fisheye bolt (501) is assembled in the metal tube tightening sleeve (503), and the upper end bolt portion thereof passes through the metal tube tightening sleeve (503) and extends above the metal tube tightening sleeve (503); The tightening belt (4) passes through the lower end connecting ring of the fisheye bolt (501) and is then wound around the metal tube (9). The fisheye bolt (501) can cooperate with the nut (502) connected to its upper end, so that the tightening belt (4) tightens the metal tube (9) upward, thereby causing the metal tube (9) and the metal tube tightening sleeve (503) to move synchronously axially along the low-voltage conductive tube (3).

8. The electric explosion spraying device for preparing inner wall coating of small-diameter metal pipe according to claim 1, characterized in that: The low-voltage electrode (11) and the high-voltage electrode (12) both have an inner conical structure, and a gas release channel (18) is further provided on the side of the low-voltage electrode (11).

9. The electric explosion spraying device for preparing inner wall coating of small-caliber metal pipe according to claim 1, characterized in that: An insulating protective cover (6) is provided at the end of the high-voltage electrode (12); a plastic sleeve (10) is provided between the low-voltage electrode (11) and the metal tube drive mechanism; The outer walls of the high-voltage electrode (12) and the high-voltage conductive tube (14) are both wrapped with a heat shrink tube (13) for high-voltage insulation protection.

10. The electric explosion spraying device for preparing inner wall coating of small-caliber metal pipe according to claim 1, characterized in that: There is a gap between the low-voltage electrode (11) and the inner wall of the metal tube (9), and there is a gap between the metal tube (9) and the inner wall of the low-voltage conductive tube (3).

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