Underwater oxygen arc cutting knife with anti-tempering protection structure

Abstract

The underwater oxygen arc cutting knife with the anti-backfire protection structure comprises a cutting knife body and a cutting knife chuck arranged on the cutting knife body, and the cutting knife body comprises a control assembly, a first anti-backfire assembly, a fixing piece, an air pipe connecting assembly, a second connecting pipe and a cable connecting assembly. The first fireproof assembly comprises a linkage valve rod, a first valve seat and a first elastic piece and is used for controlling whether oxygen enters the cutter chuck or not. The cutter chuck comprises a mounting sleeve, a clamping block and a second anti-backfire assembly, and the second anti-backfire assembly comprises a ball, a second valve seat and a second elastic piece and is used for preventing hot slag from entering the cutter body and the air valve. According to the utility model, a dual anti-backfire protection structure is realized through the first anti-backfire assembly and the second anti-backfire assembly, and the backfire phenomenon during underwater cutting operation can be effectively prevented, so that the cutter body and the air valve are prevented from being burnt by backfire, and the service life is effectively prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to underwater engineering tool technical field, concretely relates to underwater oxygen arc cutter with backfire protection structure. BACKGROUND

[0002] Underwater hot cutting method is to use heat source to heat metal, or burn in pure oxygen, make metal melt, and adopt certain measure to remove molten metal or slag to form cut, such as underwater oxygen-flame cutting, underwater electric arc cutting, underwater electric arc-oxygen cutting etc.

[0003] Among them, underwater oxygen arc cutter is the tool of electric oxygen cutting of diver at all kinds of depth underwater, has wide application in marine platform maintenance and demolition, ship hull disassembly and salvage, channel cleaning dredging etc. marine engineering and port engineering field. Specifically, cutter is cut by using electricity and oxygen, arc discharge dissolves and cuts metal, and red-hot metal and oxygen occur oxidation reaction, release a large amount of heat, and under the action of oxygen flow, blow liquid metal, reach the purpose of continuous cutting.

[0004] However, the traditional underwater oxygen arc cutter needs to open and close gas valve frequently when using, and backfire phenomenon is easy to occur. When backfire, the molten slag of scorching heat pours into cutter body and gas valve, can cause cutter body and gas valve burnout, seriously affect service life. UTILITY MODEL CONTENTS

[0005] The utility model is carried out in order to solve above-mentioned problem, purpose is at providing a kind of underwater oxygen arc cutter with backfire protection structure.

[0006] The utility model provides a kind of underwater oxygen arc cutter with backfire protection structure, including cutter body and the cutter chuck of being located on cutter body, with such characteristics:

[0007] Cutter body includes control joint, first backfire prevention joint, fixed part, gas pipe connection joint, second connecting pipe and cable connection joint,

[0008] The control assembly comprises a connecting block and a handle. The connecting block is internally provided with a stepped hole. The upper hole of the stepped hole is located on the top wall of the connecting block, and the lower hole is located on the bottom wall of the connecting block. The two ends of the stepped hole are large-diameter sections. The upper end large-diameter section is communicated with the lower end large-diameter section through a medium-diameter section and a small-diameter section. The combination of the upper end large-diameter section and the medium-diameter section, the medium-diameter section and the small-diameter section, and the small-diameter section and the lower end large-diameter section are all provided with positioning steps. The positioning steps of the medium-diameter section and the small-diameter section have stop portions extending towards the upper end large-diameter section. The two end holes of the stepped hole are respectively provided with upper and lower sealing covers. The sealing covers and the inner wall of the stepped hole are both provided with sealing members. The lower sealing cover is provided with a sliding hole communicated with the lower end large-diameter section. The top wall of the connecting block is provided with a fixed lug. The bottom wall of the connecting block is provided with two hinged lugs. The handle is hinged to the connecting block through the two hinged lugs.

[0009] The first anti-retempering assembly comprises a linkage valve rod, a first valve seat, and a first elastic member. The diameter of the linkage valve rod is smaller than that of the small-diameter section. The linkage valve rod is slidably arranged in the connecting block through the sliding hole. One end of the linkage valve rod is located in the medium-diameter section of the stepped hole, and the other end is located outside the stepped hole and abuts against the handle. The outer wall of the linkage valve rod and located in the lower end large-diameter section is provided with a limiting portion. The diameter of the limiting portion is larger than that of the sliding hole. The first valve seat is arranged on one end of the linkage valve rod. The diameter of the first valve seat is larger than that of the small-diameter section. The first elastic member is arranged between the upper sealing cover and the first valve seat.

[0010] The fixing member is provided with two fixed holes arranged in an upper and lower manner. The outer wall of the fixing member facing the handle is provided with a movable groove.

[0011] The trachea connecting assembly comprises a first connecting pipe and a trachea joint. One end of the first connecting pipe is communicated with the first connecting hole through the lower fixed hole of the fixing member. The trachea joint is arranged on the other end of the first connecting pipe.

[0012] One end of the second connecting pipe is communicated with the second connecting hole, and the other end is connected with the cutter chuck.

[0013] The cable connecting assembly comprises a third connecting pipe, a cable joint, and a conductive copper bar. One end of the third connecting pipe is fixed on the fixing member through the upper fixed hole. The cable joint is arranged on the other end of the third connecting pipe. One end of the conductive copper bar is connected with the other end of the third connecting pipe, and the other end is connected with the cutter chuck through the fixed lug.

[0014] The cutter holder comprises a mounting sleeve, a clamping block and a second anti-backfire assembly, the mounting sleeve has a first through hole and a second through hole with different inner diameters in the interior, a positioning step is arranged at the joint of the first through hole and the second through hole, the first through hole is communicated with the other end of a second connecting pipe, the clamping block is arranged in the second through hole, the clamping block has a clamping hole in the interior for accommodating an underwater cutting blade, the second anti-backfire assembly comprises a ball, a second valve seat and a second elastic member, the ball is arranged in the first through hole and located at the other end of the second connecting pipe, the diameter of the ball is larger than the inner diameter of the second connecting pipe, the second valve seat is arranged in the interior of the mounting sleeve, the second valve seat is provided with a ventilation hole communicated with the clamping hole, one end of the second elastic member is connected with the ball, and the other end is connected with the second valve seat.

[0015] The third connecting pipe, the cable joint and the conductive copper bar are all provided with an insulating sleeve, the inner wall and the outer wall of the mounting sleeve, the outer wall of the clamping block and the second valve seat and the clamping block are all provided with an insulating pad, and the insulating pad between the second valve seat and the clamping block is provided with a communication hole.

[0016] In the underwater oxygen arc cutter with the anti-backfire protection structure, the fixing member is a clamp made of insulating material.

[0017] In the underwater oxygen arc cutter with the anti-backfire protection structure, the ball is a high-temperature-resistant ball.

[0018] Effects of the utility model

[0019] According to the underwater oxygen arc cutter with the anti-backfire protection structure, the double anti-backfire protection structure is realized through the first anti-backfire assembly and the second anti-backfire assembly, the occurrence of backfire during underwater cutting operation can be effectively prevented, the backfire from burning the cutter body and the gas valve is avoided, and the service life is effectively prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a sectional view of the utility model.

[0021] BRIEF DESCRIPTION OF REFERENCE NUMERALS

[0022] 10, control joint; 11, connecting block; 111, stepped hole; 112, first connecting hole; 113, second connecting hole; 12, upper sealing cover; 13, lower sealing cover; 14, sealing member; 15, fixed lug plate; 16, hinged lug plate; 17, handle; 20, first anti-backfire joint; 21, linkage valve rod; 22, first valve seat; 23, first elastic member; 30, fixed member; 31, fixed hole; 32, movable groove; 40, air pipe connecting joint; 41, first connecting pipe; 42, air pipe joint; 50, second connecting pipe; 60, cable connecting joint; 61, third connecting pipe; 62, cable joint; 63, conductive copper bar; 70, mounting sleeve; 71, first through hole; 72, second through hole; 80, clamping block; 81, clamping hole; 90, second anti-backfire joint; 91, ball; 92, second valve seat; 921, air hole; 93, second elastic member; 100, insulating sleeve; 110, insulating pad; 120, communication hole. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the following embodiments will be described in detail in combination with the drawings.

[0024] EMBODIMENT

[0025] Figure 1 is a sectional view of the present application.

[0026] As shown in Figure 1 , the present embodiment provides an underwater oxygen arc cutter with an anti-backfire protection structure, comprising: a cutter body and a cutter chuck provided on the cutter body.

[0027] As shown in Figure 1 , the cutter body comprises a control joint 10, a first anti-backfire joint 20, a fixed member 30, an air pipe connecting joint 40, a second connecting pipe 50, and a cable connecting joint 60.

[0028] As shown in Figure 1As shown, the control assembly 10 comprises a connecting block 11 and a handle 17. The connecting block 11 is internally provided with a stepped hole 111, the upper aperture of the stepped hole 111 is located on the top wall of the connecting block 11, and the lower aperture is located on the bottom wall of the connecting block 11. The two ends of the stepped hole 111 are large-diameter sections, the upper end large-diameter section communicates with the lower end large-diameter section through a medium-diameter section and a small-diameter section. The junctions of the upper end large-diameter section and the medium-diameter section, the medium-diameter section and the small-diameter section, and the small-diameter section and the lower end large-diameter section are all provided with positioning steps. The positioning steps of the medium-diameter section and the small-diameter section have stop portions extending towards the upper end large-diameter section. The two end apertures of the stepped hole 111 are respectively provided with upper and lower sealing covers 13. The upper and lower sealing covers 13 are both provided with sealing members 14 between the sealing covers 13 and the inner wall of the stepped hole 111. Among them, a sealing ring is preferably arranged between the upper sealing cover 12 and the positioning step, and a sealing gasket is preferably arranged between the upper sealing cover 12 and the inner wall of the stepped hole 111; a sealing gasket is preferably arranged between the lower sealing cover 13 and the inner wall of the stepped hole 111. The lower sealing cover 13 is provided with a sliding hole communicating with the lower end large-diameter section. A first connecting hole 112 communicating with the medium-diameter section is formed on one side wall of the connecting block 11, and a second connecting hole 113 communicating with the small-diameter section is formed on the other side wall of the connecting block 11. The top wall of the connecting block 11 is provided with a fixed lug plate 15, and the bottom wall of the connecting block 11 is provided with two hinged lug plates 16. The handle 17 is hinged to the connecting block 11 through the two hinged lug plates 16. Among them, the two hinged lug plates 16 are both arranged close to one side wall of the connecting block 11, and are respectively arranged close to the front wall and the rear wall of the connecting block 11, and a hinge rod for hinging with the handle 17 is arranged between the two hinged lug plates 16.

[0029] As shown in Figure 1 The first anti-backfire assembly 20 comprises a linkage valve rod 21, a first valve seat 22, and a first elastic member 23. The diameter of the linkage valve rod 21 is smaller than the diameter of the small-diameter section, and the linkage valve rod 21 is slidably arranged in the connecting block 11 through the sliding hole. One end of the linkage valve rod 21 is located in the medium-diameter section of the stepped hole 111, and the other end is located outside the stepped hole 111 and abuts against the handle 17. A limiting portion is arranged on the outer wall of the linkage valve rod 21 and located in the lower end large-diameter section, and the diameter of the limiting portion is larger than the diameter of the sliding hole. Among them, the limiting portion can be arranged in multiple, and the main function of the limiting portion is to cooperate with the lower sealing cover 13 to fix the position of the linkage valve rod 21 each time it is reset, and to avoid seawater entering the small-diameter section of the stepped hole 111 when not in use. The first valve seat 22 is arranged on one end of the linkage valve rod 21, and the diameter of the first valve seat 22 is larger than the diameter of the small-diameter section. The first elastic member 23 is arranged between the upper sealing cover 12 and the first valve seat 22. Among them, when the first elastic member 23 is in a natural state, the bottom wall of the first valve seat 22 is in contact with the stop portion; when the first elastic member 23 is in a contracted state, the bottom wall of the first valve seat 22 is separated from the stop portion.

[0030] As shown in Figure 1As shown, the fixing member 30 has two fixing holes 31 arranged vertically, and the fixing member 30 has a movable groove 32 on the outer wall facing the handle 17. The fixing member 30 is used to fix the relative position between the first connecting pipe 41 and the third connecting pipe 61, and the movable groove 32 is used to allow the other end of the handle 17 to move up and down without restricting its movement.

[0031] In this embodiment, the fastener 30 is a clamp made of insulating material.

[0032] like Figure 1 As shown, the tracheal connector 40 includes a first connecting pipe 41 and a tracheal connector 42. One end of the first connecting pipe 41 passes through the fixing hole 31 located at the bottom of the fixing member 30 and communicates with the first connecting hole 112. The tracheal connector 42 is provided on the other end of the first connecting pipe 41.

[0033] like Figure 1 As shown, one end of the second connecting pipe 50 is connected to the second connecting hole 113, and the other end is connected to the cutter chuck.

[0034] like Figure 1 As shown, the cable connector assembly 60 includes a third connecting pipe 61, a cable connector 62, and a conductive copper busbar 63. One end of the third connecting pipe 61 is fixed to the fixing member 30 through the fixing hole 31 located above. The cable connector 62 is located on the other end of the third connecting pipe 61. One end of the conductive copper busbar 63 is connected to the other end of the third connecting pipe 61, and the other end passes through the fixing ear plate 15 and is connected to the cutter chuck. The conductive copper busbar 63 is tightly connected to the cutter chuck by bolts and screws.

[0035] In this embodiment, insulating sleeves 100 are fitted onto the third connecting pipe 61, cable connector 62, and conductive copper busbar 63, thereby ensuring that the cutter body is not electrified.

[0036] like Figure 1 As shown, the cutter chuck includes a mounting sleeve 70, a clamping block 80, and a second anti-backfire assembly 90.

[0037] In this embodiment, the mounting sleeve 70 has a first through hole 71 and a second through hole 72 with different inner diameters. A positioning step is provided at the joint of the first through hole 71 and the second through hole 72. The first through hole 71 is connected to the other end of the second connecting pipe 50.

[0038] In this embodiment, the clamping block 80 is disposed in the second through hole 72, and the clamping block 80 is provided with a clamping hole 81 for placing the underwater cutting bar.

[0039] In this embodiment, the second backfire prevention assembly 90 includes a ball bearing 91, a second valve seat 92, and a second elastic element 93. The ball bearing 91 is disposed within the first through hole 71 and located at the other end of the second connecting pipe 50, and the diameter of the ball bearing 91 is larger than the inner diameter of the second connecting pipe 50. The second valve seat 92 is disposed inside the mounting sleeve 70, and a vent hole 921 communicating with the clamping hole 81 is provided on the second valve seat 92. One end of the second elastic element 93 is connected to the ball bearing 91, and the other end is connected to the second valve seat 92. Preferably, the ball bearing 91 is made of a high-temperature resistant material.

[0040] In this embodiment, insulating pads 110 are provided on the inner and outer walls of the mounting sleeve 70, the outer wall of the clamping block 80, and between the second valve seat 92 and the clamping block 80. A connecting hole 120 is provided on the insulating pad 110 between the second valve seat 92 and the clamping block 80. This ensures that the cutter body is not electrified.

[0041] When using this invention for underwater cutting, firstly, the underwater cutting blade is installed on the cutting tool chuck. Then, the cable is connected to the cable connector 62, and the oxygen pipe is connected to the air pipe connector 42. After the cable is energized, the current is transmitted from the conductive copper busbar 63 to the cutting tool chuck, then from the cutting tool chuck to the underwater cutting blade, and finally to the workpiece. At this time, the diver squeezes the handle 17, causing the handle 17 to rise against the linkage valve stem 21, thereby causing the first valve seat 22 to squeeze the first elastic element 23. This allows the oxygen to pass sequentially through the first connecting pipe 41, the first connecting hole 112, the middle diameter section of the stepped hole 111, and the small diameter section of the stepped hole 111 before entering the second connecting pipe 50. Then, the oxygen pushes up the ball bearing 91, allowing the oxygen to enter the air hole of the underwater cutting blade through the vent hole 921 and the connecting hole 120, and finally to the workpiece, thus working together with the current to generate an electric arc for cutting. After the cutting work is completed, the diver releases the handle 17. At this time, the handle 17 resets, which drives the linkage valve stem 21 to reset and descend, causing the first elastic element 23 to return to its natural state. This causes the first valve seat 22 to re-fit with the stop part, so that oxygen can no longer enter the second connecting pipe 50 through the stepped hole 111. Then, the ball 91 resets under the action of the second elastic element 93, so that during the tempering moment, the hot molten slag can be prevented from entering the second connecting pipe 50 through the clamping hole 81, the connecting hole 120, and the vent hole 921, thus avoiding damage to the cutter body and the gas valve.

[0042] The role and effect of the embodiments

[0043] The underwater oxygen arc cutter with a backfire protection structure according to this utility model achieves a dual backfire protection structure through the first backfire protection assembly and the second backfire protection assembly, which can effectively prevent backfire during underwater cutting operations, thereby avoiding backfire from burning the cutter body and gas valve, and thus effectively extending the service life.

[0044] The above embodiments are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model.

Claims

1. An underwater oxygen arc cutter with a backfire protection structure, comprising a cutter body and a cutter chuck disposed on the cutter body, characterized in that: The cutter body includes a control assembly, a first anti-backfire assembly, a fixing component, an air pipe connection assembly, a second connecting pipe, and a cable connection assembly. The control assembly includes a connecting block and a handle. The connecting block has a stepped hole inside, with the upper opening located on the top wall of the connecting block and the lower opening located on the bottom wall. Both ends of the stepped hole are large-diameter sections. The upper large-diameter section communicates with the lower large-diameter section via a medium-diameter section and a small-diameter section. Positioning steps are provided at the junctions of the upper large-diameter section with the medium-diameter section, the medium-diameter section with the small-diameter section, and the small-diameter section with the lower large-diameter section. The positioning steps of the medium-diameter section and the small-diameter section have a surface facing the upper large-diameter section. The extended stop portion of the segment has upper and lower sealing caps at both ends of the stepped hole, and sealing elements are provided between the upper and lower sealing caps and the inner wall of the stepped hole. The lower sealing cap has a sliding hole communicating with the lower large-diameter segment. A first connecting hole communicating with the middle-diameter segment is opened on one side wall of the connecting block, and a second connecting hole communicating with the small-diameter segment is opened on the other side wall. A fixed ear plate is provided on the top wall of the connecting block, and two hinged ear plates are provided on the bottom wall of the connecting block. The handle is hinged to the connecting block through the two hinged ear plates. The first backfire prevention assembly includes a linkage valve stem, a first valve seat, and a first elastic element. The diameter of the linkage valve stem is smaller than the diameter of the small diameter section. The linkage valve stem is slidably mounted on the connecting block through the sliding hole. One end of the linkage valve stem is located inside the middle diameter section of the stepped hole, and the other end is located outside the stepped hole and abuts against the handle. A limiting part is provided on the outer wall of the linkage valve stem located in the lower large diameter section. The diameter of the limiting part is larger than the diameter of the sliding hole. The first valve seat is located on one end of the linkage valve stem. The diameter of the first valve seat is larger than the diameter of the small diameter section. The first elastic element is located between the upper sealing cover and the first valve seat. The fastener has two fastening holes arranged vertically and horizontally, and the fastener has a movable groove on its outer wall facing the handle. The tracheal connector includes a first connecting pipe and a tracheal connector. One end of the first connecting pipe passes through the fixing hole located at the bottom of the fixing member and communicates with the first connecting hole. The tracheal connector is located on the other end of the first connecting pipe. One end of the second connecting tube is connected to the second connecting hole, and the other end is connected to the cutter chuck; The cable connector assembly includes a third connecting tube, a cable connector, and a conductive copper busbar. One end of the third connecting tube is fixed to the fixing member through the fixing hole located above. The cable connector is located on the other end of the third connecting tube. One end of the conductive copper busbar is connected to the other end of the third connecting tube, and the other end passes through the fixing ear plate and is connected to the cutter chuck. The cutter chuck includes a mounting sleeve, a clamping block, and a second anti-backfire assembly. The mounting sleeve has a first through hole and a second through hole with unequal inner diameters. A positioning step is provided at the junction of the first through hole and the second through hole. The first through hole communicates with the other end of the second connecting pipe. The clamping block is located in the second through hole and has a clamping hole for placing the underwater cutting blade. The second anti-backfire assembly includes a ball bearing, a second valve seat, and a second elastic element. The ball bearing is located in the first through hole and at the other end of the second connecting pipe. The diameter of the ball bearing is larger than the inner diameter of the second connecting pipe. The second valve seat is located inside the mounting sleeve and has a vent hole communicating with the clamping hole. One end of the second elastic element is connected to the ball bearing, and the other end is connected to the second valve seat. The third connecting pipe, the cable connector, and the conductive copper busbar are all fitted with insulating sleeves. Insulating pads are provided on the inner and outer walls of the mounting sleeve, the outer wall of the clamping block, and between the second valve seat and the clamping block. A connecting hole is provided on the insulating pad between the second valve seat and the clamping block.

2. The underwater oxygen arc cutter with a tempering protection structure according to claim 1, characterized in that: in, The fastener is an insulating clamp.

3. The underwater oxygen arc cutter with a tempering protection structure according to claim 1, characterized in that: in, The balls are made of high-temperature resistant material.

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