Method for burr removal and chamfering of end face of explosion-proof small-caliber metal pipe

Abstract

The invention provides a method for burr removal and chamfering of the end face of an explosion-proof type small-caliber metal pipe. Comprising the following steps: measuring the end face excircle size of a pipe by using a vernier caliper, and confirming the specifications and sizes of a clamping centering mechanism and a sealing element; manufacturing an explosion-proof shell, a clamping and centering mechanism and a tool apron; the clamping and centering mechanism is preassembled in advance; a clamping centering mechanism, a tool apron, a tool, a spring, a linear bearing, a thrust ball bearing and an anti-explosion shell are assembled; the front end and the rear end of the pipe are sealed, the pipe is inserted into the anti-explosion shell from the clamping and centering mechanism end to make contact with the cutter, a shifting handle of a mechanical iris is operated to center the pipe, and the pipe is clamped through a positioning screw; an inflation valve of the anti-explosion shell is connected with a gas source for pressurizing and pressure maintaining, non-combustible gas such as carbon dioxide, argon and nitrogen is inflated, and it needs to be guaranteed that the pressure of a pressure gauge is larger than 0.2 mpa; and the tool apron is rotated, the tool apron is screwed forwards to be ground, and burr removing and chamfering operation is completed.

Description

Technical Field

[0001] The invention relates to a pipeline in the field of ships, and in particular to a method for removing burrs and chamfering the end surface of an explosion-proof small-caliber metal pipe. Background Art

[0002] The shipbuilding industry is complex and the operating environment is diverse. The pipe end faces often need to be processed during the construction process.

[0003] However, the inventors of this application found that the above technology has at least the following technical problems in the process of implementing the technical solution of the invention in the embodiment of this application: Pipes are generally made of metal pipes, and mechanical grinding and cutting are generally used in the processing of metal pipes. A large number of sparks will be generated in the processing process. The sparks will directly contact the surrounding working environment and easily cause fire and explosion accidents in the surrounding environment, which will increase safety risks. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, and to address the problem of sparks generated by end face burr removal and chamfering of explosion-proof small-diameter metal pipes, the embodiment of the present application provides a method for end face burr removal and chamfering of explosion-proof small-diameter metal pipes. The method uses an explosion-proof small-diameter metal pipe end face burr removal and chamfering device, one end of which uses a clamping and centering mechanism to clamp the pipe for centering and clamping, and the other end drives the tool through a magnetic tool holder to remove burrs and chamfer in a closed accommodating chamber covered by an explosion-proof housing. The explosion-proof housing is filled with carbon dioxide, argon, and nitrogen non-flammable gases, and is completely in a sealed state, which has an explosion-proof effect and solves the technical problem of end face burr removal and chamfering of explosion-proof small-diameter metal pipes.

[0005] The solution adopted by the embodiment of the present application to solve the technical problem is: An explosion-proof small-caliber metal pipe end face burr removal and chamfering device comprises an explosion-proof housing, a base, a clamping and centering mechanism, a tool, a tool holder, a tool holder double-lip stainless steel PTFE skeleton oil seal, a spring, a thrust ball bearing and a linear bearing; The explosion-proof housing is used to accommodate the pipe, and non-flammable gas is filled into the enclosed closed chamber to perform burr removal and chamfering operations; the base is fixedly arranged at the lower part of the explosion-proof housing to support the explosion-proof housing 1 to maintain stability; the clamping and centering mechanism is arranged at one end of the explosion-proof housing to clamp the pipe and center it to ensure the quality of burr removal and chamfering operations; the tool is arranged in the accommodating cavity of the explosion-proof housing, and the tool and the center of the clamping and centering mechanism are in line, and are used to remove burrs and chamfer the pipe; the tool holder extends into the chamber of the explosion-proof housing, and the tool is inserted and fixed, and rotates during the burr removal and chamfering process, and is used for feeding and connecting with external power; at the outer end of the tool holder There is another knife seat in the mirror image, and magnets are embedded in the adjacent parts of the two knife seats, so that the knife seats are magnetic; a friction plate is arranged between the two knife seats to link them for power transmission; the double-lip stainless steel PTFE skeleton oil seal of the knife seat is assembled on the knife seat, which is used for sealing between the knife seat and the explosion-proof housing; the linear bearing is arranged in the chamber facing the clamping and centering mechanism, which is used for assembling the knife seat extending into the explosion-proof housing; the spring is assembled on the knife seat extending into the explosion-proof housing, which is used for the tool to automatically reset after the feed pressure is reduced; the thrust ball bearing is assembled on the knife seat extending into the explosion-proof housing, and is located on the outside of the double-lip stainless steel PTFE skeleton oil seal of the knife seat and the inside of the spring; The tube is clamped at one end of the explosion-proof casing by a clamping and centering mechanism, a tool holder for inserting a tool is arranged at the other end of the explosion-proof casing, non-flammable gas is filled into the explosion-proof casing, and the tool holder drives the tool to remove burrs and chamfer in the accommodating cavity of the explosion-proof casing.

[0006] In a preferred embodiment, an inner tube plug is provided at the end of the tube extending into the explosion-proof housing, and an outer tube plug is provided at the outer end of the tube, and both the inner tube plug and the outer tube plug are internal expansion type tube plugs.

[0007] In a preferred embodiment, a chamber is provided at one end of the explosion-proof casing for accommodating the pipe and assembling the cutting tool; a pressure gauge and an air charging valve are provided in the radial direction of the chamber, the air charging valve is used to connect to the gas source for pressurization and pressure maintenance, and the pressure gauge is used to dynamically monitor the sealing effect of the burr removal and chamfering process, and control the amount of non-combustible gas charged to avoid insufficient or overcharging; a bearing through hole and a through hole boss are provided at the other end of the explosion-proof casing for assembling and fixing linear bearings, double-lip stainless steel PTFE skeleton oil seals of the tool holder, thrust ball bearings and springs.

[0008] In a preferred embodiment, a mechanical iris is provided at one end of the clamping and centering mechanism for centering the tube. A hand seal is radially provided on the clamping and centering mechanism for operating the mechanical iris. A tube double-lip stainless steel polytetrafluoroethylene skeleton oil seal is provided on the outer side of the mechanical iris for sealing between the clamping and centering mechanism and the tube. A positioning screw is provided at the other end of the clamping and centering mechanism for locking and fixing the tube. The number, specifications and distribution of the positioning screws have various forms, the number meets ≥3 and is evenly distributed, and the screw tightening process needs to synchronously feed 1 / 2 thread without affecting the clamping and centering mechanism.

[0009] In a preferred embodiment, the mechanical iris in the clamping and centering mechanism may be an Archimedean spiral iris or other structures with an annular centering function.

[0010] In a preferred embodiment, the mechanical iris includes a base plate, a toothed plate, a dial and blades, and a dial hand on the dial extends outward through a dial hand sealing opening.

[0011] In a preferred embodiment, the tool holder includes a feed rotating shaft and a boss, wherein the feed rotating shaft is provided at one end of the tool holder and the boss is provided at the other end; a hexagonal connecting rod through hole is provided in the middle of the tool holder, and grooves are arranged on the outer side of the boss with the hexagonal connecting rod through hole as the center for embedding magnets; in the tool holder extending into the explosion-proof housing, the feed rotating shaft is sequentially equipped with a spring, a thrust ball bearing and a tool holder double-lip stainless steel PTFE skeleton oil seal, and is connected to a linear bearing, and the handle of the tool is inserted into the hexagonal connecting rod through hole; the hexagonal connecting rod through hole of the tool holder, which is mirrored therewith, is used to connect the hexagonal connecting rod, and a rotational power is provided at the end of the hexagonal connecting rod through a handle or an electric tool to drive the tool to rotate.

[0012] In a preferred embodiment, standard scale lines are engraved on the feed rotation axis of the tool holder.

[0013] In a preferred embodiment, the tool includes an external burr removal and chamfering tool and an internal burr removal and chamfering tool, wherein the grinding head of the external burr removal and chamfering tool head is V-shaped, and the grinding head of the internal burr removal and chamfering tool head is inverted V-shaped; the shank of the tool is a hexagonal structure, so that the tool can be inserted into the hexagonal connecting rod through hole of the tool holder.

[0014] In a preferred embodiment, the friction plate is made of soft silicone and soft rubber.

[0015] In order to further solve the technical problem to be solved by the embodiment of the present application, in a method for removing burrs and chamfering the end face of an explosion-proof small-diameter metal pipe provided in the embodiment of the present application, an explosion-proof small-diameter metal pipe end face burr removal and chamfering device is applied, comprising the following steps: Step 1: Use a vernier caliper to measure the outer diameter of the end face of the pipe, confirm the specifications and dimensions of the clamping and centering mechanism and the seal, the mechanical iris elasticity of the clamping and centering mechanism must meet the requirements of centering and clamping the pipe, the double-lip stainless steel PTFE skeleton oil seal of the pipe in the seal matches the pipe, and the double-lip stainless steel PTFE skeleton oil seal of the knife holder matches the knife holder; use a vernier caliper to measure the burr size of the end face of the pipe to confirm the screw-in depth of the deburring; Step 2: According to the specifications of the selected clamping and centering mechanism and the outer diameter of the end surface of the pipe to be processed, an explosion-proof housing, a clamping and centering mechanism and a knife seat are manufactured; Step 3: pre-install the clamping and centering mechanism. The clamping and centering mechanism uses a mechanical iris. The clamping is mainly tightened by using positioning screws after centering. Step 4: Assemble the clamping and centering mechanism, tool holder, tool, spring, linear bearing, thrust ball bearing and explosion-proof housing. When assembling, select springs with appropriate wire diameter to ensure sufficient rebound force and avoid the rebound force affecting the tool holder feed stroke; assemble the magnet and the groove of the tool holder and fix them with quick-drying glue. When assembling, ensure that the magnetic guide lines of each tool holder in the two tool holders are in the same direction and the magnetic guide lines of the two tool holders are in opposite directions to ensure that the magnets can attract each other; select magnets with appropriate quantity, diameter and thickness according to the outer diameter, wall thickness and material hardness of the cutting tube and the friction coefficient of the friction plate; Step 5: Seal the front and rear ends of the tube, insert the tube from the clamping and centering mechanism end into the explosion-proof housing to touch the tool, operate the mechanical iris handle to center the tube, and clamp the tube with the positioning screw; connect the inflation valve at the lower end of the explosion-proof housing to the gas source to pressurize and maintain the pressure, and fill it with non-combustible gases such as carbon dioxide, argon, and nitrogen. Observe the pressure gauge after inflation / pressurization; Step six: fix the manual rotating handle or the rechargeable electric drill to the hexagonal connecting rod of the tool holder, rotate the tool holder while slowly pressing it in, screw the tool holder forward for grinding, and complete the burr removal and chamfering operations.

[0016] Furthermore, in step five, after the tube is inserted into the end face of the cutter and tightened, it needs to be withdrawn 10-20 mm.

[0017] Furthermore, in the step five, the device needs to be pressurized or inflated and sealed before construction, and the pressure gauge needs to be dynamically monitored during the entire construction process. Construction needs to be stopped if the pressure drops or is insufficient. There are no restrictions on the gas filled as long as it is non-flammable gas. There are no restrictions on the inflation method and inflation valve as long as they meet the pressure requirements. The pressure is greater than 0.2 MPa. If the pressure gauge pressure drops suddenly during the construction process, construction needs to be stopped immediately, and the leak must be checked and repaired.

[0018] Furthermore, in step six, the tool holder is fed in batches, with each feeding being 2 mm.

[0019] Positive effects: The technical solution provided in the embodiments of the present application has at least the following technical effects or advantages: 1. Since the embodiment of the present application adopts a technical means of clamping the pipe with a clamping and centering mechanism at one end of the explosion-proof casing, the clamping and centering mechanism has a mechanical iris and a positioning screw, has elasticity and clamping force, is flexible in operation, and has precise centering, which effectively solves the technical problem of centering during burr removal and chamfering of the pipe in the prior art, thereby achieving the technical effect of ensuring the quality of burr removal and chamfering.

[0020] 2. Since the embodiment of the present application adopts a technical means in which a tool holder is provided at the other end of the explosion-proof casing, and the tool is inserted on the tool holder and extends into the accommodating cavity of the explosion-proof casing, the tool performs pipe burr removal and chamfering operations in a closed non-flammable gas protection environment, which effectively solves the technical problems of pipe burr removal and chamfering safety in the prior art, thereby achieving the technical effect of avoiding the safety risks caused by sparks generated by burr removal and chamfering.

[0021] 3. Since the embodiment of the present application adopts the technical means of assembling a spring on the feed rotating shaft of the tool holder and inlaying magnets on the two tool holders, the tool holder has resilience and magnetism. During the tool feeding process, it only needs to be pressed evenly. When the tool is stuck with the end face of the pipe, bolt, or bar, it will automatically disengage. At the same time, due to the action of the spring, the tool will automatically reset after the feed pressure is reduced, which effectively solves the technical problems of excessive feed amount and mechanical locking in the feeding process leading to accidents in the prior art, thereby achieving the technical effect of automatic disengagement and reset of the tool.

[0022] 4. Since the embodiment of the present application adopts the technical means of arranging inner and outer seals at both ends of the pipe, inlaying a double-lip stainless steel polytetrafluoro skeleton oil seal between the pipe and the clamping and centering mechanism, and inlaying a double-lip stainless steel polytetrafluoro skeleton oil seal between the knife holder and the explosion-proof shell, the device can be completely in a sealed state, effectively solving the technical problems of pipe burr removal and chamfering safety in the prior art, thereby achieving the technical effect of explosion-proof.

[0023] 5. Since the embodiment of the present application adopts the technical means of filling non-combustible gases such as carbon dioxide, argon, nitrogen, etc. into the explosion-proof housing through an inflation valve, it effectively solves the technical problem of safety risks caused by sparks generated by burr removal and chamfering in the prior art, thereby achieving the technical effect of explosion-proof.

[0024] The invention is suitable for use as a method for removing burrs and chamfering the end faces of explosion-proof small-diameter metal pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 This is an exploded view of an explosion-proof small-diameter metal pipe end face burr removal and chamfering device; Figure 2 It is a northwest isometric view of an explosion-proof small-diameter metal pipe end face burr removal and chamfering device; Figure 3 It is a southwest isometric view of an explosion-proof small-diameter metal pipe end face burr removal and chamfering device; Figure 4 This is a front view of an explosion-proof small-diameter metal pipe end face burr removal and chamfering device; Figure 5 This is a front view and cross-section of an explosion-proof small-diameter metal pipe end face burr removal and chamfering device; Figure 6 It is a top view of an explosion-proof small-diameter metal pipe end face burr removal and chamfering device; Figure 7 It is a side view of an explosion-proof small-diameter metal pipe end face burr removal and chamfering device; Figure 8 It is the southwest isometric view of the clamping and centering mechanism; Fig. 9 This is the front view of the clamping and centering mechanism; Fig.10 It is the AA section view of the clamping and centering mechanism; Fig.11 It is a top view of the clamping and centering mechanism; Fig.12 It is the cross-sectional view of the clamping and centering mechanism CC; Fig.13 This is the southeast isometric view of the tool holder; Fig.14 It is a schematic diagram of the external burr removal and chamfering tool; Fig.15 Schematic diagram of internal burr removal and chamfering tool.

[0027] In the figure: 0. Tube, 01. Sealing inside the pipe, 02. Blocking outside the pipe; 1. Explosion-proof housing, 11. Pressure gauge, 12. Inflation valve; 2. Base; 3. Clamping and centering mechanism; 31. Mechanical iris, 311. Chassis, 312. Sprocket, 313. Dial, 314. Leaves, 32. Positioning screws, 33. Pipe double lip stainless steel PTFE skeleton oil seal; 4. Knives; 41. External burr removal and chamfering tools, 42. Internal burr removal and chamfering tools; 5. Knife holder, 51. Feed rotary axis, 52.Protruding shoulders, 53. Hexagonal connecting rod through hole, 54. Groove; 6. Knife holder double lip stainless steel PTFE skeleton oil seal; 7. Spring; 8.Thrust ball bearing; 9. Linear bearings. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Although the embodiments of the present invention have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention.

[0029] As shown in the figure, an explosion-proof small-diameter metal pipe end face burr removal and chamfering device includes an explosion-proof housing 1, a base 2, a clamping and centering mechanism 3, a tool 4, a tool holder 5, a tool holder double-lip stainless steel PTFE skeleton oil seal 6, a spring 7, a thrust ball bearing 8 and a linear bearing 9; The explosion-proof housing 1 is a cylindrical structure, used to accommodate the pipe 0, and non-combustible gas is filled into the enclosed closed chamber to perform burr removal and chamfering operations to avoid safety risks caused by grinding sparks; The base 2 is fixedly arranged at the lower part of the explosion-proof housing 1 to support the explosion-proof housing 1 to maintain stability, so that the burr removal and chamfering operations can be carried out smoothly; The clamping and centering mechanism 3 is arranged at one end of the explosion-proof housing 1, and is used to clamp the pipe 0 and center it to ensure the quality of burr removal and chamfering operations; The tool 4 is arranged in the accommodating cavity of the explosion-proof housing 1, and the tool 4 is colinear with the center of the clamping and centering mechanism 3, and is used to remove burrs and chamfer the pipe 0; The tool holder 5 is a stepped hollow shaft, which extends into the chamber of the explosion-proof housing 1, and is inserted and fixed with the tool 4. It rotates during the burr removal and chamfering process, and is used for feeding and connecting with external power. Another tool holder 5 is mirrored at the outer end of the tool holder 5, and magnets are embedded in the adjacent parts of the two tool holders 5, so that the tool holders 5 are magnetic. A friction plate is provided between the two tool holders 5 to link them for power transmission. The knife seat double-lip stainless steel PTFE skeleton oil seal 6 is assembled on the knife seat 5 and is used for sealing between the knife seat 5 and the explosion-proof housing 1; The linear bearing 9 is arranged in a chamber facing the clamping and centering mechanism 3 and is used to assemble the knife seat 5 extending into the explosion-proof housing 1; The spring 7 is mounted on the knife seat 5 extending into the explosion-proof housing 1, and is used to automatically reset the knife 4 after the feed pressure is reduced; The thrust ball bearing 8 is assembled on the knife seat 5 extending into the explosion-proof housing 1, and is located on the outside of the double-lip stainless steel PTFE skeleton oil seal 6 of the knife seat and the inside of the spring 7; Among them, the tube 0 is clamped at one end of the explosion-proof casing 1 by a clamping and centering mechanism 3, and a tool holder 5 for inserting a tool 4 is arranged at the other end of the explosion-proof casing 1. The explosion-proof casing 1 is filled with non-combustible gases such as carbon dioxide, argon and nitrogen. The tool holder 5 drives the tool 4 to remove burrs and chamfer in the accommodating cavity of the explosion-proof casing 1. The operation process is in a sealed state, which has an explosion-proof effect.

[0030] In order to ensure the stability of the structure of this embodiment, an inner tube plug 01 is provided at the end of the tube 0 extending into the explosion-proof casing 1, and an outer tube plug 02 is provided at the outer end of the tube 0. Both the inner tube plug 01 and the outer tube plug 02 are internal expansion type tube plugs, which ensure sufficient tube sealing force and form two seals in the inner cavity of the tube 0 to seal it.

[0031] In order to further ensure the stability of the structure of this embodiment, a chamber is provided at one end of the explosion-proof housing 1 for accommodating the tube 0 and assembling the tool 4; a pressure gauge 11 and an air filling valve 12 are provided in the radial direction of the explosion-proof housing 1, the air filling valve 12 is used to connect the gas source for pressurization and pressure maintenance, and the pressure gauge 11 is used to dynamically monitor the sealing effect of the burr removal and chamfering process, and can also control the amount of non-combustible gas charged to avoid insufficient or overcharging; a bearing through hole and a through hole boss are provided at the other end of the explosion-proof housing 1 for assembling and fixing the linear bearing 9, the double-lip stainless steel tetrafluoro skeleton oil seal 6 of the tool holder, the thrust ball bearing 8 and the spring 7. In this embodiment, in order to ensure that the entire device is completely in a sealed state, or for a better explosion-proof effect, the device can be filled with non-combustible gases such as carbon dioxide, argon, and nitrogen, and the pressure gauge is observed after inflation / pressurization, and the pressure gauge must be guaranteed to be greater than 0.2 MPa.

[0032] In order to optimize the structure of this embodiment, the clamping and centering mechanism 3 is a cylindrical structure. A mechanical iris 31 is provided at one end of the clamping and centering mechanism 3 for clamping and centering the tube 0. A hand seal is radially provided at the clamping and centering mechanism 3 for operating the mechanical iris 31. A tube double-lip stainless steel tetrafluoro skeleton oil seal 33 is provided on the outer side of the mechanical iris 31 for sealing between the clamping and centering mechanism 3 and the tube 0. A positioning screw 32 is provided at the other end of the clamping and centering mechanism 3 for locking and fixing the tube 0. In this embodiment, three positioning screws 32 are used. The number of positioning screws 32 can be increased under actual circumstances, but it is necessary to ensure that the number of positioning screws 32 is ≥3 and is distributed at equal angles in a 360° ring. Multiple positioning screws 32 need to be tightened synchronously during the tightening process. The positioning screws 32 must not interfere with the centering accuracy of the clamping and centering mechanism 3. Multiple positioning screws 32 need to be evenly screwed in 1 / 2 thread each time until they are clamped. Specifically, the number, specifications and distribution of the positioning screws 32 have various forms, the number meets the requirement of ≥3 and is evenly distributed, the screw tightening process needs to be fed synchronously 1 / 2 thread, and does not affect the clamping and centering mechanism 3.

[0033] As a conventional technical choice, the mechanical iris 31 in the clamping and centering mechanism 3 may be an Archimedean spiral iris or other structures with an annular centering function.

[0034] Preferably, the mechanical iris 31 includes a base plate 311 , a toothed plate 312 , a dial 313 and blades 314 , and a dial handle on the dial 313 extends outward through a dial handle sealing opening.

[0035] In order to further optimize the structure of this embodiment, the tool holder 5 includes a feed rotating shaft 51 and a boss 52. The feed rotating shaft 51 is provided at one end of the tool holder 5, and the boss 52 is provided at the other end; a hexagonal connecting rod through hole 53 is provided in the middle of the tool holder 5, and grooves 54 are arranged on the outer side of the boss 52 with the hexagonal connecting rod through hole 53 as the center, which are used to embed magnets; in the tool holder 5 extending into the explosion-proof housing 1, the feed rotating shaft 51 is sequentially assembled with a spring 7, a thrust ball bearing 8 and a tool holder double-lip stainless steel polytetrafluoroethylene skeleton oil seal 6, and is connected to a linear bearing 9, and the handle of the tool 4 is inserted into the hexagonal connecting rod through hole 53; the hexagonal connecting rod through hole 53 of the tool holder 5, which is mirrored therewith, is used to connect the hexagonal connecting rod, and the end of the hexagonal connecting rod is connected through a handle or an electric tool to provide rotational power to drive the tool 4 to rotate.

[0036] Preferably, the feed rotation axis 51 of the tool holder 5 is engraved with standard scale lines for confirming the feed depth.

[0037] In order to further optimize the structure of this embodiment, the tool 4 includes an external burr removal and chamfering tool 41 and an internal burr removal and chamfering tool 42, wherein the grinding head of the external burr removal and chamfering tool head 41 is V-shaped, and the grinding head of the internal burr removal and chamfering tool 42 is inverted V-shaped; the shank of the tool 4 is a hexagonal structure, so that the tool 4 can be inserted into the hexagonal connecting rod through hole 53 of the tool holder 5.

[0038] As a conventional technical choice, the friction plate is made of soft silicone and soft rubber materials with greater friction and a certain degree of softness.

[0039] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages: Since a clamping and centering mechanism 3 is provided at one end of the explosion-proof housing 1 to clamp the tube 0, the clamping and centering mechanism 3 has a mechanical iris 31 and a positioning screw 32, has elasticity and clamping force, is flexible in operation, and has precise centering. Therefore, the tube 0 can be centered through the clamping and centering mechanism 3, has concentricity, and ensures the quality of burr removal and chamfering.

[0040] Since a tool holder 5 is provided at the other end of the explosion-proof housing 1, and a tool 4 is inserted on the tool holder and extends into the accommodating cavity of the explosion-proof housing 1, the tool 4 performs burr removal and chamfering operations on the tube 0 in a covered and closed environment, thereby avoiding safety risks caused by sparks generated by burr removal and chamfering.

[0041] Since the spring 7 is assembled on the feed rotating shaft 51 of the tool holder 5 and the magnets 10 are embedded on the two tool holders 5, the tool holder 5 has resilience and magnetism. During the feeding process of the tool 4, it only needs to be pressed evenly. There is no need to worry about excessive feeding amount, resulting in mechanical locking or even accidents. When the tool 4 is stuck with the end face of the pipe 0, it will automatically disengage. At the same time, due to the action of the spring 7, the tool 4 will automatically reset after the feeding pressure is reduced.

[0042] Since an inner tube seal 01 and an outer tube seal 02 are provided at both ends of the tube 0, a tube double-lip stainless steel polytetrafluoro skeleton oil seal 33 is embedded between the tube 0 and the clamping and centering mechanism 3, and a knife holder double-lip stainless steel polytetrafluoro skeleton oil seal 6 is embedded between the knife holder 5 and the explosion-proof housing 1, the device can be completely in a sealed state to obtain a better explosion-proof effect.

[0043] Since non-combustible gases such as carbon dioxide, argon, and nitrogen are charged into the explosion-proof housing 1 through the charging valve 12, the device can be completely sealed, thereby having a better explosion-proof effect.

[0044] A method for removing burrs and chamfering the end surface of an explosion-proof small-caliber metal pipe comprises the following steps: Step 1: Use a vernier caliper to measure the outer diameter of the end face of the tube 0, confirm the specifications and dimensions of the clamping and centering mechanism 3 and the seal, the elasticity of the mechanical iris 31 of the clamping and centering mechanism 3 must meet the requirements of centering and clamping the tube 0, the tube double-lip stainless steel polytetrafluoroethylene skeleton oil seal 33 in the seal matches the tube 0, and the knife holder double-lip stainless steel polytetrafluoroethylene skeleton oil seal 6 matches the knife holder 4 to meet the requirements of rotational motion and linear motion sealing; use a vernier caliper to measure the burr size of the end face of the tube 0 to confirm the screw-in depth of the deburring, the end face chamfer needs to be calculated in advance according to the chamfer outer diameter, wall thickness and end face inclination angle, in order to avoid complex calculations affecting the construction efficiency, it is recommended to adopt the method of batch feeding, that is, feeding 2mm each time, taking out the tube 0 to observe or measure whether it meets the requirements, if not, feed 2mm again until it meets the requirements; Step 2: According to the specifications of the selected clamping and centering mechanism 3 and the outer diameter of the end face of the tube 0 to be processed, the explosion-proof housing 1, the clamping and centering mechanism 3 and the tool holder 5 are manufactured. To facilitate the design, production and interchangeability of subsequent parts, the tool holder 5 adopts the mirror design principle. The tool holder 5 is not only a fixing, rotating, advancing and retreating device of the tool 4, but also a power transmission device for the entire burr removal and chamfering device. The end of the tool holder 5 is connected to the handle or the electric tool to provide rotational power to ensure the normal rotation of the tool 4. To ensure that the tool 4 can play a normal function and ensure its durability, the outer diameter of the feed rotating shaft 51 is 0.2-0.5mm smaller than the inner diameter of the linear bearing 9; Step three, pre-install the clamping and centering mechanism 3 in advance to ensure that the clamping and centering mechanism 3 is flexible in operation, accurate in centering and has sufficient clamping force. The clamping and centering mechanism 3 adopts a mechanical iris 31. In actual use, an Archimedean spiral iris or other structures with annular centering function can also be used. At the same time, the mechanical iris 31 has only a single centering mechanism. According to actual conditions, the number of mechanical irises 31 can be appropriately increased to reduce the centering error; clamping is mainly tightened with screws after centering. This embodiment adopts three screws. According to actual conditions, the number of screws can be increased, but it is necessary to ensure that the number of screws is ≥3 and is distributed at 360° annular angles. Multiple screws need to be tightened synchronously during the tightening process, and the screws must not interfere with the centering accuracy of the mechanical iris 31. Multiple bolts need to be screwed in 1 / 2 thread evenly each time until they are clamped; Step 4: Assemble the clamping and centering mechanism 3, the knife seat 5, the knife 4, the spring 7, the linear bearing 9, the thrust ball bearing 8 and the explosion-proof housing 1. The assembly shall be performed in order. The spring 7 with a suitable wire diameter shall be selected. The wire diameter of the stainless steel and carbon steel springs shall be greater than the wire diameter of the copper and non-metal springs. The specific size of the spring wire diameter shall be selected according to the actual elastic force of the same batch of springs to meet the use requirements. The spring 7 ensures sufficient rebound force and avoids excessive rebound force affecting the feed stroke of the knife seat 5. Insert the magnet into the groove 54 of the knife seat 5. Assemble and fix with quick-drying glue, and wait for it to solidify completely before use. During assembly, it is necessary to ensure that the magnetic guide lines of each of the two knife seats 5 are in the same direction, and at the same time ensure that the magnetic guide lines of the two knife seats are in opposite directions to ensure that the magnets can attract each other; according to the outer diameter, wall thickness and material hardness of the cutting tube 0 and the friction coefficient of the friction plate, select magnets of appropriate number, diameter and thickness to ensure sufficient cutting rotation conduction force and safety. While ensuring the cutting force, it is also necessary to ensure that when the machine is stuck, the knife seat connection part can be disengaged in time to ensure safety; Step 5: seal the front and rear ends of the tube 0, and insert the tube 0 from the clamping and centering mechanism 3 into the explosion-proof housing 1 to touch the tool 4. To prevent locking, retreat 10-20 mm after touching the tool 4. Operate the dial of the mechanical iris 31 to center the tube 0, and clamp the tube by the positioning screw 32; connect the inflation valve 12 at the lower end of the explosion-proof housing 1 to the gas source to pressurize and maintain the pressure, observe the upper end pressure gauge 11, and make sure that the entire device is completely sealed. Alternatively, for better explosion-proof effect, the device can be filled with non-combustible gases such as carbon dioxide, argon, and nitrogen. After inflation / pressurization, observe the pressure gauge 11, which must be >0.2 MPa. If the pressure of the pressure gauge 11 drops suddenly during the construction process, stop the construction immediately, check and repair the leak. The pressure gauge 11 can mainly be used to check the entire The sealing effect can be dynamically monitored during the construction process, and the amount of non-combustible gas charged can also be controlled to avoid insufficient or overcharging; the manual rotating handle or the rechargeable hand drill is fixedly connected to the small end of the tool holder 5 with a standard hexagonal connecting rod, and the tool holder 5 is slowly pressed in while rotating. Since a rebound spring 7 and a magnetic tool holder 5 are provided, the feeding process only requires uniform pressing, and there is no need to worry about excessive feeding, resulting in mechanical locking and causing accidents. When the tool 4 is stuck with the end face of the pipe 0, it will automatically disengage. At the same time, due to the action of the spring 7, the tool 4 will automatically reset after the feeding pressure is reduced; Step 6: Screw the tool holder 5 forward for grinding to complete burr removal and chamfering.

[0045] It is worth noting that the contents not described in detail in the specification belong to the prior art known to those skilled in the art, and the model parameters of the clamping and centering mechanism 3, the tool holder double-lip stainless steel PTFE skeleton oil seal 6, the spring 7, the thrust ball bearing 8, the linear bearing 9, the magnet, the hexagonal connecting rod and the mechanical iris 31 are not specifically limited and can be determined using conventional equipment. In this technical solution, the electrical control components not mentioned are not shown in the figure because they belong to the prior art and will not be described here.

[0046] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An explosion-proof small-caliber metal pipe end face burr removal and chamfering device, characterized by: It includes an explosion-proof housing (1), a base (2), a clamping and centering mechanism (3), a tool (4), a tool holder (5), a tool holder double-lip stainless steel polytetrafluoroethylene skeleton oil seal (6), a spring (7), a thrust ball bearing (8) and a linear bearing (9); The explosion-proof housing (1) is used to accommodate the pipe (0), and a non-combustible gas is filled into the enclosed closed chamber to perform burr removal and chamfering operations; The base (2) is fixedly mounted on the lower part of the explosion-proof housing (1) to support the explosion-proof housing (1) to maintain stability; A clamping and centering mechanism (3) is arranged at one end of the explosion-proof housing (1) and is used to clamp the pipe (0) and center it to ensure the quality of burr removal and chamfering operations; The tool (4) is arranged in the accommodating cavity of the explosion-proof housing (1), the tool (4) and the center of the clamping and centering mechanism (3) are colinear, and are used to remove burrs and chamfer the pipe (0); The tool holder (5) extends into the chamber of the explosion-proof housing (1), into which the tool (4) is inserted and fixed, and rotates during the burr removal and chamfering process, and is used for feeding and connecting with external power. Another tool holder (5) is mirrored at the outer end of the tool holder (5), and magnets are embedded in the adjacent parts of the two tool holders (5), so that the tool holders (5) have magnets. A friction plate is provided between the two tool holders (5), so that they are linked to transmit power. The knife seat double-lip stainless steel polytetrafluoroethylene skeleton oil seal (6) is assembled on the knife seat (5) and is used for sealing between the knife seat (5) and the explosion-proof housing (1); The linear bearing (9) is arranged in a chamber facing the clamping and centering mechanism (3) and is used for assembling a knife seat (5) extending into the explosion-proof housing (1); The spring (7) is mounted on a tool holder (5) extending into the explosion-proof housing (1) and is used to automatically reset the tool (4) after the feed pressure is reduced; The thrust ball bearing (8) is mounted on the knife seat (5) extending into the explosion-proof housing (1) and is located on the outside of the double-lip stainless steel tetrafluoroethylene skeleton oil seal (6) of the knife seat and on the inside of the spring (7); The tube (0) is clamped at one end of the explosion-proof housing (1) by a clamping and centering mechanism (3), a tool holder (5) for inserting a tool (4) is arranged at the other end of the explosion-proof housing (1), the explosion-proof housing (1) is filled with non-flammable gas, and the tool holder (5) drives the tool (4) to perform burr removal and chamfering operations in the accommodating cavity of the explosion-proof housing (1).

2. The explosion-proof small-diameter metal pipe end face burr removal and chamfering device according to claim 1 is characterized in that: The end of the tube (0) extending into the explosion-proof housing (1) is provided with an inner tube plug (01), and the outer tube plug (02) is provided at the outer end of the tube (0). Both the inner tube plug (01) and the outer tube plug (02) are inner expansion type tube plugs.

3. The explosion-proof small-diameter metal pipe end face burr removal and chamfering device according to claim 2 is characterized by: A chamber is provided at one end of the explosion-proof housing (1) for accommodating a tube (0) and assembling a tool (4); a pressure gauge (11) and an air charging valve (12) are provided in the radial direction of the chamber; the air charging valve (12) is used to connect to an air source for pressurization and pressure maintenance; the pressure gauge (11) is used to dynamically monitor the sealing effect of the burr removal and chamfering process and control the amount of non-combustible gas charged; a bearing through hole and a through hole boss are provided at the other end of the explosion-proof housing (1) for assembling a fixed linear bearing (9), a tool holder double-lip stainless steel tetrafluoroethylene skeleton oil seal (6), a thrust ball bearing (8) and a spring (7).

4. The explosion-proof small-diameter metal pipe end face burr removal and chamfering device according to claim 3 is characterized by: A mechanical iris (31) is provided at one end of the clamping and centering mechanism (3) for centering the tube (0). A hand seal is provided radially on the clamping and centering mechanism (3) for operating the mechanical iris (31). A tube double-lip stainless steel polytetrafluoroethylene skeleton oil seal (33) is provided on the outer side of the mechanical iris (31) for sealing between the clamping and centering mechanism (3) and the tube (0). A positioning screw (32) is provided at the other end of the clamping and centering mechanism (3) for locking and fixing the tube (0). The number, specification and distribution of the positioning screw (32) are various. The number satisfies ≥3 and is evenly distributed. During the screw tightening process, 1 / 2 thread needs to be fed synchronously without affecting the clamping and centering mechanism (3).

5. The explosion-proof small-diameter metal pipe end face burr removal and chamfering device according to claim 4 is characterized in that: The mechanical iris (31) in the clamping and centering mechanism (3) may be an Archimedean spiral iris or other structures with an annular centering function; The mechanical iris (31) comprises a base plate (311), a toothed plate (312), a dial (313) and blades (314); a dial handle on the dial (313) extends outward through a dial handle sealing opening.

6. The explosion-proof small-diameter metal pipe end face deburring and chamfering device according to claim 5 is characterized by: The knife seat (5) comprises a feed rotating shaft (51) and a boss (52), wherein the feed rotating shaft (51) is provided at one end of the knife seat (5) and the boss (52) is provided at the other end; a hexagonal connecting rod through hole (53) is provided in the middle of the knife seat (5), and grooves (54) are arranged on the outer side of the boss (52) with the hexagonal connecting rod through hole (53) as the center, for embedding magnets; in the knife seat (5) extending into the explosion-proof housing (1), the feed rotating shaft (51) is sequentially equipped with springs; The tool holder (4) is provided with a spring (7), a thrust ball bearing (8) and a double-lip stainless steel polytetrafluoroethylene skeleton oil seal (6), and is connected to a linear bearing (9). The handle of the tool (4) is inserted into the hexagonal connecting rod through hole (53). The hexagonal connecting rod through hole (53) of the tool holder (5) is mirrored therewith and is used to connect the hexagonal connecting rod. The end of the hexagonal connecting rod is connected through a handle or an electric tool to provide rotational power to drive the tool (4) to rotate. The feed rotation axis (51) of the tool holder (5) is engraved with standard scale lines.

7. The explosion-proof small-diameter metal pipe end face deburring and chamfering device according to claim 6 is characterized by: The tool (4) comprises an external burr removal and chamfering tool (41) and an internal burr removal and chamfering tool (42), wherein the grinding head of the external burr removal and chamfering tool head (41) is V-shaped, and the grinding head of the internal burr removal and chamfering tool (42) is inverted V-shaped; the shank of the tool (4) is a hexagonal structure, so that the tool (4) can be inserted into the hexagonal connecting rod through hole (53) of the tool holder (5); and the friction plate is made of soft silicone and soft rubber.

8. A method for removing burrs and chamfering the end surface of an explosion-proof small-diameter metal pipe, characterized in that: The device according to any one of claims 1 to 7 comprises the following steps: Step 1: Use a vernier caliper to measure the outer diameter of the end face of the tube (0), confirm the specifications and dimensions of the clamping and centering mechanism (3) and the sealing member, the elasticity of the mechanical iris (31) of the clamping and centering mechanism (3) must meet the requirements of centering and clamping the tube (0), the tube double-lip stainless steel tetrafluoro skeleton oil seal (33) in the seal must match the tube (0), and the knife holder double-lip stainless steel tetrafluoro skeleton oil seal (6) must match the knife holder 4; use a vernier caliper to measure the burr size of the end face of the tube (0) to confirm the screw-in depth for deburring; Step 2: According to the selected specifications of the clamping and centering mechanism (3) and the outer diameter of the end surface of the pipe (0) to be processed, the explosion-proof housing (1), the clamping and centering mechanism (3) and the knife seat (5) are manufactured; Step 3: pre-install the clamping and centering mechanism (3), wherein the clamping and centering mechanism (3) uses a mechanical iris (31), and the clamping is mainly performed by fastening with a positioning screw (32) after centering; Step 4: Assemble the clamping and centering mechanism (3), the knife seat (5), the knife (4), the spring (7), the linear bearing (9), the thrust ball bearing (8) and the explosion-proof housing (1). When assembling, a spring (7) with a suitable wire diameter should be selected to ensure sufficient rebound force and avoid the rebound force affecting the feed stroke of the knife seat (5); assemble the magnet with the groove (54) of the knife seat (5) and fix them with quick-drying glue. When assembling, it is necessary to ensure that the magnetic guide lines of each knife seat (5) in the two knife seats (5) are in the same direction and at the same time ensure that the magnetic guide lines of the two knife seats are in opposite directions to ensure that the magnets can attract each other; according to the outer diameter, wall thickness and material hardness of the cutting tube (0) and the friction coefficient of the friction plate, select magnets with a suitable number, diameter and thickness; Step 5: seal the front and rear ends of the tube (0), insert the tube (0) from the end of the clamping and centering mechanism (3) into the explosion-proof housing (1) to touch the tool (4), operate the handle of the mechanical iris (31) to center the tube (0), and clamp the tube by the positioning screw (32); connect the inflation valve (12) at the lower end of the explosion-proof housing (1) to the gas source to pressurize and maintain the pressure, and fill it with carbon dioxide, argon, nitrogen and other non-flammable gases, and observe the pressure gauge (11) after inflation / pressurization; Step 6: fix the manual rotating handle or the rechargeable hand drill to the hexagonal connecting rod of the tool holder (5), rotate the tool holder (5) and slowly press it in, so that the tool holder (5) is rotated forward for grinding, and the burr removal and chamfering operation are completed.

9. The method for removing burrs and chamfering the end surface of an explosion-proof small-diameter metal pipe according to claim 8, characterized in that: In step 5, after the pipe (0) is inserted into the end face of the cutter and tightened, it needs to be withdrawn 10-20 mm; In step 5, the device needs to be pressurized or inflated to seal before construction, and the pressure gauge (11) needs to be dynamically monitored during the entire construction process. If the pressure drops or is insufficient, construction needs to be stopped. The gas to be filled is not restricted as long as it is non-flammable gas. The inflation method and inflation valve are not restricted as long as they meet the pressure requirements, and the pressure is greater than 0.2 MPa. If the pressure of the pressure gauge (11) drops suddenly during the construction process, construction needs to be stopped immediately, and the leak needs to be checked and repaired.

10. The method for removing burrs and chamfering the end surface of an explosion-proof small-diameter metal pipe according to claim 9, characterized in that: In step six, the tool holder (5) is fed in batches, with each feeding being 2 mm.

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