A method for removing burrs and chamfering the end face of explosion-proof small-diameter metal pipes.

Abstract

This invention proposes a method for removing burrs and chamfering the end face of explosion-proof small-diameter metal pipes. The method includes the following steps: measuring the outer diameter of the pipe end face using calipers to confirm the selection of the clamping and centering mechanism and the specifications of the sealing components; fabricating the explosion-proof housing, clamping and centering mechanism, and tool holder; pre-assembling the clamping and centering mechanism; assembling the clamping and centering mechanism, tool holder, cutting tool, spring, linear bearing, thrust ball bearing, and explosion-proof housing; sealing the front and rear ends of the pipe, inserting the pipe into the explosion-proof housing through the clamping and centering mechanism until it touches the cutting tool, centering the pipe using the mechanical iris lever, and clamping the pipe using the positioning screws; connecting the inflation valve of the explosion-proof housing to a gas source for pressurization and pressure maintenance, filling with non-flammable gases such as carbon dioxide, argon, or nitrogen, ensuring the pressure gauge reading is >0.2 MPa; rotating the tool holder forward to grind, completing the burr removal and chamfering operation.

Description

Technical Field

[0001] This invention relates to pipelines in the field of marine engineering, and in particular to a method for removing burrs and chamfering the end face of explosion-proof small-diameter metal pipes. Background Technology

[0002] Shipbuilding is a complex field with diverse working environments, and the construction process often requires end-face treatment of pipes.

[0003] However, in the process of implementing the inventive technical solution in the embodiments of this application, the inventors of this application discovered that the above-mentioned technology has at least the following technical problems:

[0004] Pipes are generally made of metal, and the processing of metal pipes typically involves mechanical grinding and cutting, which generates a large number of sparks. These sparks can come into direct contact with the surrounding work environment, potentially causing fires or explosions and increasing safety risks. Summary of the Invention

[0005] To address the shortcomings of existing technologies and the safety risks posed by sparks generated during burr removal and chamfering of explosion-proof small-diameter metal pipe end faces, this application provides a method for burr removal and chamfering of explosion-proof small-diameter metal pipe end faces. This method utilizes a device for burr removal and chamfering of explosion-proof small-diameter metal pipe end faces. One end uses a clamping and centering mechanism to hold and center the pipe, while the other end uses a magnetic tool holder to drive a cutting tool. Burr removal and chamfering are performed within a sealed cavity enclosed by an explosion-proof shell. The explosion-proof shell is filled with non-flammable gases such as carbon dioxide, argon, and nitrogen, ensuring a completely sealed environment and providing explosion-proof protection. This solves the technical problem of burr removal and chamfering of explosion-proof small-diameter metal pipe end faces.

[0006] The solution adopted by the embodiments of this application to solve the technical problem is:

[0007] An explosion-proof device for removing burrs and chamfering the end face of small-diameter metal pipes includes an explosion-proof housing, a base, a clamping and centering mechanism, a cutting tool, a cutting tool holder, a double-lip stainless steel PTFE skeleton oil seal for the cutting tool holder, a spring, a thrust ball bearing, and a linear bearing.

[0008] The explosion-proof enclosure is used to house the pipe, and non-flammable gas is filled into the enclosed, sealed chamber for deburring and chamfering operations. A base is fixed to the lower part of the explosion-proof enclosure, supporting its stability. A clamping and centering mechanism is located at one end of the explosion-proof enclosure to clamp and center the pipe, ensuring the quality of the deburring and chamfering operations. A cutting tool is located in the housing of the explosion-proof enclosure, with its center collinear with the clamping and centering mechanism, used for deburring and chamfering the pipe. A tool holder extends into the chamber of the explosion-proof enclosure, inserts and fixes the cutting tool, and rotates during the deburring and chamfering process for feeding and connection to external power. At the outer end of the tool holder… The mirror image has another tool holder, and magnets are embedded in the adjacent parts of the two tool holders, making the tool holders magnetic. A friction plate is provided between the two tool holders to link them together for power transmission. A double-lip stainless steel PTFE skeleton oil seal is fitted on the tool holder for sealing between the tool holder and the explosion-proof housing. A linear bearing is set in the chamber opposite to the clamping and centering mechanism for mounting the tool holder that extends into the explosion-proof housing. A spring is mounted on the tool holder that extends into the explosion-proof housing to allow the tool to automatically return to its original position after the feed pressure is reduced. A thrust ball bearing is mounted on the tool holder that extends into the explosion-proof housing and is located outside the double-lip stainless steel PTFE skeleton oil seal of the tool holder and inside the spring.

[0009] The tube is clamped to one end of the explosion-proof housing by a clamping and centering mechanism, and the tool holder for the insert tool is located at the other end of the explosion-proof housing. The explosion-proof housing is filled with non-flammable gas, and the tool holder drives the tool to perform burr removal and chamfering operations within the cavity of the explosion-proof housing.

[0010] In a preferred embodiment, an internal plug is provided at the end of the pipe that extends into the explosion-proof housing, and an external plug is provided at the outer end of the pipe. Both the internal and external plugs are internal expansion plugs.

[0011] In a preferred embodiment, one end of the explosion-proof housing has a chamber for housing the tube and mounting the cutting tool; a pressure gauge and an inflation valve are provided radially in the chamber. The inflation valve is used to connect to a 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, control the amount of non-flammable gas injected, and avoid insufficient or over-injection; the other end of the explosion-proof housing has a bearing through hole and a through hole boss for mounting and fixing a linear bearing, a double-lip stainless steel PTFE skeleton oil seal for the tool holder, a thrust ball bearing, and a spring.

[0012] In a preferred embodiment, a mechanical iris is provided at one end of the clamping and centering mechanism for centering the tube. The clamping and centering mechanism is provided radially with a lever sealing port for operating the mechanical iris. A double-lip stainless steel PTFE skeleton oil seal is provided on the outside 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 can be varied, with the number being ≥3 and evenly distributed. The screw tightening process requires simultaneous feeding of 1 / 2 thread without affecting the clamping and centering mechanism.

[0013] In a preferred embodiment, the mechanical iris in the clamping and centering mechanism can be an Archimedes spiral iris or other structures with a ring-shaped centering function.

[0014] In a preferred embodiment, the mechanical iris includes a chassis, a gear plate, a dial, and blades, with a lever on the dial extending outward through a lever seal.

[0015] In a preferred embodiment, the tool holder includes a feed rotary shaft and a shoulder. The feed rotary shaft is located at one end of the tool holder, and the shoulder is located at the other end. A hexagonal connecting rod through hole is located in the middle of the tool holder. Grooves arranged around the hexagonal connecting rod through hole are arranged on the outer side of the shoulder for embedding magnets. In the tool holder extending into the explosion-proof housing, a spring, a thrust ball bearing, and a double-lip stainless steel PTFE skeleton oil seal of the tool holder are sequentially mounted on the feed rotary shaft and connected to a linear bearing. The shank of the tool is inserted into the hexagonal connecting rod through hole. The hexagonal connecting rod through hole of the tool holder, mirrored thereon, is used to connect a hexagonal connecting rod. Rotational power is provided at the end of the hexagonal connecting rod via a handle or power tool to drive the tool to rotate.

[0016] In a preferred embodiment, standard scale lines are engraved on the feed rotation axis of the tool holder.

[0017] In a preferred embodiment, the cutting 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 is V-shaped, and the grinding head of the internal burr removal and chamfering tool is inverted V-shaped; the shank of the tool is hexagonal, so that the tool can be inserted into the hexagonal connecting rod through hole of the tool holder.

[0018] In a preferred embodiment, the friction pad is made of soft silicone and soft rubber.

[0019] To further address the technical problems addressed in the embodiments of this application, the embodiments of this application provide a method for removing and chamfering the end face of an explosion-proof small-diameter metal pipe, which utilizes an explosion-proof small-diameter metal pipe end face burr removal and chamfering device, including the following steps:

[0020] Step 1: Use vernier calipers to measure the outer diameter of the pipe end face to confirm the selected clamping and centering mechanism and the specifications and dimensions of the sealing components. The mechanical iris of the clamping and centering mechanism must be able to center and clamp the pipe. Among the sealing components, the double-lip stainless steel PTFE skeleton oil seal of the pipe must match the pipe, and the double-lip stainless steel PTFE skeleton oil seal of the tool holder must match the tool holder. Use vernier calipers to measure the burr size of the pipe end face to confirm the deburring depth.

[0021] Step 2: Based on the selected clamping and centering mechanism specifications and the outer diameter of the end face of the pipe to be processed, manufacture the explosion-proof shell, clamping and centering mechanism, and tool holder.

[0022] Step 3: Pre-install the clamping and centering mechanism. The clamping and centering mechanism uses a mechanical iris, and clamping is mainly achieved by tightening with positioning screws after centering.

[0023] Step four: Assemble the clamping and centering mechanism, tool holder, cutting tool, spring, linear bearing, thrust ball bearing, and explosion-proof housing. When assembling, select springs with appropriate wire diameters to ensure sufficient rebound force while avoiding any impact on the tool holder's feed stroke. Assemble the magnets into the grooves of the tool holders and secure them with quick-drying adhesive. During assembly, ensure that the magnetic guide lines of each tool holder are aligned in the same direction, while ensuring that the magnetic guide lines of the two tool holders are opposite in direction to ensure that the magnets can attract each other. Select an appropriate number, diameter, and thickness of magnets based on the outer diameter, wall thickness, material hardness, and friction coefficient of the friction plates of the tube being cut.

[0024] Step 5: Seal the front and rear ends of the tube, and insert the tube into the explosion-proof housing through the clamping and centering mechanism. Use the lever of the mechanical iris to center the tube and clamp it with the positioning screw. Connect the gas valve at the lower end of the explosion-proof housing to the gas source for pressurization and pressure maintenance. Fill with non-flammable gases such as carbon dioxide, argon, and nitrogen. Observe the pressure gauge after filling / pressurizing.

[0025] Step six: Securely connect the manual rotating handle or cordless electric drill to the hexagonal connecting rod of the tool holder. While rotating the tool holder, slowly press it in to grind the tool holder forward, completing the burr removal and chamfering operation.

[0026] Furthermore, in step five, after the tube is inserted into the end face of the cutter and tightened, it needs to be pulled back 10-20mm.

[0027] Furthermore, in step five, the device must be pressurized or inflated and sealed before construction, and the pressure gauge must be dynamically monitored throughout the construction process. Construction must be stopped if the pressure drops or is insufficient. As long as the gas used for inflation is not flammable, there are no restrictions. The inflation method and inflation valve are not restricted as long as the pressure requirement is met. The pressure must be >0.2 MPa. If the pressure gauge pressure drops suddenly during construction, construction must be stopped immediately, and the leak must be checked and repaired.

[0028] Furthermore, in step six, the tool holder is fed in batches, with each batch feeding 2mm.

[0029] Positive effects: The technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0030] 1. As this application embodiment adopts the technical means of clamping and centering the tube by setting a clamping and centering mechanism at one end of the explosion-proof shell, the clamping and centering mechanism has a mechanical iris and a positioning screw, has telescopicity and clamping force, operates flexibly, and centers accurately, effectively solving the technical problem of centering when removing burrs and chamfering the tube in the prior art, thereby achieving the technical effect of ensuring the quality of burr removal and chamfering.

[0031] 2. Because the embodiments of this application adopt the technical means of setting a knife holder at the other end of the explosion-proof shell and inserting the knife into the cavity of the explosion-proof shell, the knife performs pipe burr removal and chamfering operations in a sealed non-flammable gas protective environment, which effectively solves the technical problem of pipe burr removal and chamfering safety in the prior art, and thus achieves the technical effect of avoiding the safety risks caused by sparks generated during burr removal and chamfering.

[0032] 3. Because the embodiments of this application employ the technical means of assembling a spring on the feed rotation shaft of the tool holder and embedding magnets on the two tool holders, the tool holder has rebound and magnetism. During the tool feeding process, only uniform pressing is required. When the tool gets stuck with the end face of the tube, bolt, or bar, it will automatically disengage. At the same time, due to the action of the spring, after the feed pressure is reduced, the tool will automatically reset. This effectively solves the technical problem of excessive feed amount and mechanical locking leading to accidents in the prior art, thereby achieving the technical effect of automatic tool disengagement and reset.

[0033] 4. Because the embodiments of this application employ technical means of setting internal and external plugs at both ends of the pipe, embedding a double-lip stainless steel PTFE skeleton oil seal between the pipe and the clamping and centering mechanism, and embedding a double-lip stainless steel PTFE skeleton oil seal between the knife holder and the explosion-proof shell, the device can be completely sealed, effectively solving the technical problems of pipe burr removal and chamfering safety in the prior art, thereby achieving the technical effect of explosion protection.

[0034] 5. Since the embodiments of this application adopt the technical means of filling the explosion-proof enclosure with non-flammable gases such as carbon dioxide, argon, and nitrogen through an inflation valve, the technical problem of safety risks caused by burr removal and chamfering sparks in the prior art is effectively solved, thereby achieving the technical effect of explosion protection.

[0035] It is suitable as a method for removing burrs and chamfering the end face of explosion-proof small-diameter metal pipes. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 An exploded view of an explosion-proof device for removing burrs and chamfering the end face of small-diameter metal pipes;

[0038] Figure 2 Northwest isometric view of an explosion-proof small-diameter metal pipe end face burr removal and chamfering device;

[0039] Figure 3 A southwest isometric view of an explosion-proof small-diameter metal pipe end face burr removal and chamfering device;

[0040] Figure 4 A front view of a device for removing and chamfering the end face of an explosion-proof small-diameter metal pipe;

[0041] Figure 5 A front sectional view of a device for removing and chamfering the end face of an explosion-proof small-diameter metal pipe;

[0042] Figure 6 A top view of a device for removing and chamfering the end face of an explosion-proof small-diameter metal pipe;

[0043] Figure 7 A side view of an explosion-proof small-diameter metal pipe end face burr removal and chamfering device;

[0044] Figure 8 Southwest isometric view of the clamping and centering mechanism;

[0045] Figure 9 Front view of the clamping centering mechanism;

[0046] Figure 10 A cross-sectional view of the clamping and centering mechanism AA;

[0047] Figure 11 Top view of the clamping and centering mechanism;

[0048] Figure 12 CC section view of the clamping and centering mechanism;

[0049] Figure 13 This is the isometric view of the southeast side of the tool holder;

[0050] Figure 14Schematic diagram of external burr removal and chamfering tools;

[0051] Figure 15 This is a schematic diagram of a tool for removing internal burrs and chamfering.

[0052] In the picture:

[0053] 0. Pipe,

[0054] 01. Pipeline sealing,

[0055] 02. External sealing of the pipe;

[0056] 1. Explosion-proof casing,

[0057] 11. Pressure gauge

[0058] 12. Inflation valve;

[0059] 2. Base;

[0060] 3. Clamping and centering mechanism;

[0061] 31. Mechanical iris,

[0062] 311. Chassis

[0063] 312. Gear disc,

[0064] 313. Dial,

[0065] 314. Leaf blade

[0066] 32. Locating screws,

[0067] 33. Double-lip stainless steel PTFE skeleton oil seal for pipes;

[0068] 4. Cutting tools;

[0069] 41. Deburring and chamfering tools,

[0070] 42. Internal burr removal and chamfering tools;

[0071] 5. Knife holder,

[0072] 51. Feed rotary axis,

[0073] 52.Protruding shoulders,

[0074] 53. Hexagonal connecting rod through hole,

[0075] 54. Groove;

[0076] 6. Double-lip stainless steel PTFE skeleton oil seal for the tool holder;

[0077] 7. Spring;

[0078] 8. Thrust ball bearing;

[0079] 9. Linear bearings. Detailed Implementation

[0080] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Although embodiments of the present invention have been shown and described, it will be understood by those skilled 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. The scope of the present invention is defined by the appended claims and their equivalents. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0081] As shown in the figure, an explosion-proof small-diameter metal pipe end face burr removal and chamfering device includes an explosion-proof shell 1, a base 2, a clamping and centering mechanism 3, a cutting tool 4, a cutting tool holder 5, a double-lip stainless steel PTFE skeleton oil seal for the cutting tool holder 6, a spring 7, a thrust ball bearing 8, and a linear bearing 9.

[0082] The explosion-proof housing 1 is a cylindrical structure used to house the tube 0. Non-flammable gas is filled into the enclosed sealed chamber for burr removal and chamfering operations to avoid safety risks caused by grinding sparks.

[0083] The base 2 is fixed to the lower part of the explosion-proof housing 1, supporting the explosion-proof housing 1 to maintain stability, so that the deburring and chamfering operations can be carried out smoothly;

[0084] The clamping and centering mechanism 3 is located 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.

[0085] The cutting tool 4 is placed in the receiving cavity of the explosion-proof housing 1. The cutting tool 4 is collinear with the center of the clamping and centering mechanism 3 and is used to remove burrs and chamfer the pipe 0.

[0086] The tool holder 5 is a stepped hollow shaft that extends into the chamber of the explosion-proof housing 1. The tool 4 is inserted and fixed in place. It rotates during the deburring and chamfering process for feeding and connecting to external power. Another tool holder 5 is mirrored on the outer end of the tool holder 5. Magnets are embedded in the adjacent parts of the two tool holders 5, making the tool holders 5 magnetic. A friction plate is provided between the two tool holders 5 to link them together for power transmission.

[0087] The double-lip stainless steel PTFE skeleton oil seal 6 of the tool holder is assembled on the tool holder 5 and is used for sealing between the tool holder 5 and the explosion-proof housing 1.

[0088] The linear bearing 9 is disposed in the cavity opposite to the clamping and centering mechanism 3 and is used to assemble the tool holder 5 that extends into the explosion-proof housing 1;

[0089] Spring 7 is mounted on tool holder 5 that extends into explosion-proof housing 1, so that tool 4 can automatically reset after feed pressure is reduced;

[0090] The thrust ball bearing 8 is mounted on the tool holder 5, which extends into the explosion-proof housing 1, and is located outside the double-lip stainless steel PTFE skeleton oil seal 6 and inside the spring 7.

[0091] The tube 0 is clamped to one end of the explosion-proof housing 1 by the clamping and centering mechanism 3, and the tool holder 5 of the insert tool 4 is set at the other end of the explosion-proof housing 1. The explosion-proof housing 1 is filled with non-flammable gases such as carbon dioxide, argon and nitrogen. The tool holder 5 drives the tool 4 to perform burr removal and chamfering operations in the cavity of the explosion-proof housing 1. The operation is in a sealed state and has an explosion-proof effect.

[0092] To ensure the stability of the structure in this embodiment, an internal pipe plug 01 is provided at the end of the pipe 0 that extends into the explosion-proof shell 1, and an external pipe plug 02 is provided at the outer end of the pipe 0. Both the internal pipe plug 01 and the external pipe plug 02 are internal expansion type pipe plugs to ensure sufficient pipe sealing force and form two seals in the inner cavity of the pipe 0 to seal it.

[0093] To further ensure the stability of the structure in this embodiment, one end of the explosion-proof housing 1 is provided with a chamber for housing the tube 0 and mounting the cutting tool 4. A pressure gauge 11 and a gas filling valve 12 are provided radially on the explosion-proof housing 1. The gas filling valve 12 is used to connect to a gas source for pressurization and pressure maintenance. The pressure gauge 11 is used to dynamically monitor the sealing effect during burr removal and chamfering processes, and can also control the amount of non-flammable gas injected to avoid insufficient or excessive filling. The other end of the explosion-proof housing 1 is provided with a bearing through-hole and a through-hole boss for mounting and fixing the linear bearing 9, the double-lip stainless steel PTFE skeleton oil seal 6 of the cutting tool holder, the thrust ball bearing 8, and the spring 7. In this embodiment, to ensure the entire device is completely sealed, or for better explosion-proof performance, the device can be filled with non-flammable gases such as carbon dioxide, argon, or nitrogen. After filling / pressurizing, the pressure gauge should be observed; the pressure gauge must maintain a pressure >0.2 MPa.

[0094] 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 lever sealing port is provided radially on the clamping and centering mechanism 3 for operating the mechanical iris 31. A double-lip stainless steel PTFE skeleton oil seal 33 is provided on the outside of the mechanical iris 31 for sealing the connection 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, according to the actual situation. The number of positioning screws 32 can be increased depending on the actual situation, but it is necessary to ensure that the number of positioning screws 32 is ≥3 and they are distributed in a 360° ring at equal angles. 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 screwed in 1 / 2 thread evenly each time until clamped. Specifically, the number, specifications and distribution of positioning screws 32 can take many forms. The number must be ≥3 and evenly distributed. The screw tightening process needs to be fed 1 / 2 thread synchronously and should not affect the clamping and centering mechanism 3.

[0095] As a conventional technical choice, the mechanical iris 31 in the clamping and centering mechanism 3 can be an Archimedes spiral iris or other structures with a ring-shaped centering function.

[0096] Preferably, the mechanical iris 31 includes a chassis 311, a gear disc 312, a dial 313, and a blade 314, with a lever on the dial 313 extending outward through a lever sealing port.

[0097] To further optimize the structure of this embodiment, the tool holder 5 includes a feed rotation shaft 51 and a shoulder 52. The feed rotation shaft 51 is provided at one end of the tool holder 5, and the shoulder 52 is provided at the other end. A hexagonal connecting rod through hole 53 is provided in the middle of the tool holder 5. Grooves 54 are arranged on the outer side of the shoulder 52 with the hexagonal connecting rod through hole 53 as the center, for embedding magnets. In the tool holder 5 extending into the explosion-proof housing 1, a spring 7, a thrust ball bearing 8, and a tool holder double-lip stainless steel PTFE skeleton oil seal 6 are sequentially mounted on the feed rotation shaft 51 and connected to a linear bearing 9. The shank 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 thereon, is used to connect a hexagonal connecting rod. The end of the hexagonal connecting rod is connected to a handle or power tool to provide rotational power to drive the tool 4 to rotate.

[0098] Preferably, the feed rotation axis 51 of the tool holder 5 is engraved with standard scale lines to confirm the feed depth.

[0099] 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. The grinding head of the external burr removal and chamfering tool 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 has a hexagonal structure, which allows the tool 4 to be inserted into the hexagonal connecting rod through hole 53 of the tool holder 5.

[0100] As a standard technical choice, friction pads are made of soft silicone and soft rubber materials that have high friction and a certain degree of softness.

[0101] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages:

[0102] Because 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, which has telescopicity and clamping force, flexible operation and precise centering. Therefore, the tube 0 can be centered by the clamping and centering mechanism 3, and has concentricity, which ensures the quality of burr removal and chamfering.

[0103] Since a tool holder 5 is provided at the other end of the explosion-proof housing 1, and the tool 4 is inserted into the cavity of the explosion-proof housing 1, the tool 4 performs the deburring and chamfering of the pipe 0 in a sealed environment to avoid the safety risks caused by sparks generated during deburring and chamfering.

[0104] Because spring 7 is mounted on the feed rotation shaft 51 of tool holder 5 and magnets 10 are embedded on the two tool holders 5, tool holder 5 has rebound and magnetism. During the feeding process of tool 4, it is only necessary to press evenly. There is no need to worry about excessive feed amount causing mechanical lock-up or even accidents. When tool 4 is stuck with the end face of tube 0, it will automatically disengage. At the same time, due to the action of spring 7, after the feed pressure is reduced, tool 4 will automatically reset.

[0105] Because the pipe 0 is equipped with an inner pipe plug 01 and an outer pipe plug 02 at both ends, and a double-lip stainless steel PTFE skeleton oil seal 33 is embedded between the pipe 0 and the clamping and centering mechanism 3, and a double-lip stainless steel PTFE skeleton oil seal 6 is embedded between the knife holder 5 and the explosion-proof shell 1, the device can be completely sealed and achieve better explosion-proof effect.

[0106] Since non-flammable gases such as carbon dioxide, argon, and nitrogen are filled into the explosion-proof enclosure 1 through the gas filling valve 12, the device can be completely sealed, thus achieving better explosion-proof performance.

[0107] A method for removing burrs and chamfering the end face of an explosion-proof small-diameter metal pipe includes the following steps:

[0108] Step 1: Use vernier calipers to measure the outer diameter of the end face of pipe 0 to confirm the selected clamping and centering mechanism 3 and the specifications and dimensions of the sealing components. The mechanical iris 31 of the clamping and centering mechanism 3 must have sufficient flexibility to center and clamp pipe 0. Among the sealing components, the double-lip stainless steel PTFE skeleton oil seal 33 of the pipe is matched with pipe 0, and the double-lip stainless steel PTFE skeleton oil seal 6 of the knife holder is matched with the knife holder 4 to meet the requirements for rotary and linear motion sealing. Use vernier calipers to measure the burr size of the end face of pipe 0 to confirm the deburring depth. The end face chamfer needs to be calculated in advance based on the chamfer outer diameter, wall thickness, and end face inclination angle. To avoid complex calculations affecting construction efficiency, it is recommended to use a batch feeding method, that is, feed 2mm each time, take out pipe 0 to observe or measure whether it meets the requirements, if it does not meet the requirements, feed 2mm again until it meets the requirements.

[0109] Step 2: Based on the selected clamping and centering mechanism 3 specifications and the outer diameter of the end face of the tube 0 to be processed, manufacture the explosion-proof housing 1, the clamping and centering mechanism 3, and the tool holder 5. To facilitate design, production, and subsequent interchangeability of parts, the tool holder 5 adopts a mirror design principle. The tool holder 5 is not only the device for fixing, rotating, advancing, and retracting the tool 4, but also the power transmission device for the entire burr removal and chamfering device. The end of the tool holder 5 is connected to the handle or power tool to provide rotational power to ensure the normal rotation of the tool 4. To ensure that the tool 4 can perform its normal function and to ensure its durability, the outer diameter of the feed rotary shaft 51 is 0.2-0.5mm smaller than the inner diameter of the linear bearing 9.

[0110] Step 3: Pre-install the clamping and centering mechanism 3 to ensure its flexible operation, accurate centering, and sufficient clamping force. The clamping and centering mechanism 3 uses a mechanical iris 31. In actual use, an Archimedes spiral iris or other structures with a ring-shaped centering function can also be used. The mechanical iris 31 has only a single centering mechanism. Depending on the actual situation, the number of mechanical irises 31 can be appropriately increased to reduce centering error. Clamping is mainly achieved by tightening with screws after centering. In this embodiment, three screws are used. Depending on the actual situation, the number of screws can be increased, but it is necessary to ensure that the number of screws is ≥3 and they are distributed in a 360° ring at equal angles. Multiple screws must be tightened synchronously during the tightening process, and the screws must not interfere with the centering accuracy of the mechanical iris 31. Each time, multiple bolts must be screwed in 1 / 2 thread evenly until clamped.

[0111] Step four: Assemble the clamping and centering mechanism 3, tool holder 5, cutting tool 4, spring 7, linear bearing 9, thrust ball bearing 8, and explosion-proof housing 1. Assemble in the correct order. Select spring 7 with appropriate wire diameter; the wire diameter of stainless steel and carbon steel springs should be greater than that of copper and non-metallic springs. The specific spring wire diameter should be selected based on the actual spring force of the same batch of springs to meet usage requirements. Spring 7 should ensure sufficient rebound force while avoiding excessive rebound force that could affect the feed stroke of tool holder 5. Insert the magnet into the groove 54 of tool holder 5. For assembly, use quick-drying adhesive to fix it, and wait for it to completely solidify before use. During assembly, it is necessary to ensure that the magnetic guide lines of each of the two tool holders 5 are in the same direction, and at the same time, ensure that the magnetic guide lines of the two tool holders are in opposite directions to ensure that the magnets can attract each other. According to the outer diameter, wall thickness, material hardness and friction coefficient of the cutting tube 0, select an appropriate number, diameter and thickness of magnets to ensure sufficient cutting rotation transmission force and safety. While ensuring the cutting force, it is also necessary to ensure that the tool holder connection can be disengaged in time in case of mechanical jamming to ensure safety.

[0112] 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 cutter 4. To prevent locking, retract the tube 0 10-20mm after touching the cutter 4.

[0113] Use the lever on the mechanical iris 31 to center the pipe 0, and clamp the pipe using the positioning screw 32. Connect the inflation valve 12 at the lower end of the explosion-proof housing 1 to the gas source for pressurization and pressure maintenance. Observe the pressure gauge 11 at the upper end to ensure that the entire device is completely sealed. Alternatively, for better explosion-proof performance, the device can be filled with non-flammable gases such as carbon dioxide, argon, or nitrogen. After inflation / pressurization, observe the pressure gauge 11. The pressure gauge 11 must maintain a pressure >0.2 MPa. If the pressure on the pressure gauge 11 drops suddenly during construction, construction must be stopped immediately, and leaks must be checked and repaired. The pressure gauge 11 mainly monitors the entire... The sealing effect is dynamically monitored during construction, and the amount of non-combustible gas filled can be controlled to avoid insufficient or excessive filling. The manual rotating handle or cordless electric drill is fixedly connected to the small end of the cutter head 5 with a standard hexagonal connecting rod. While rotating the cutter head 5, press it in slowly. Because of the rebound spring 7 and the magnetic cutter head 5, the feeding process only requires uniform pressing. There is no need to worry about excessive feed amount causing mechanical lock-up and accidents. When the cutter 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 cutter 4 will automatically reset after the feed pressure is reduced.

[0114] Step 6: Rotate the tool holder 5 forward to grind, completing the burr removal and chamfering.

[0115] It is worth noting that all contents not described in detail in the specification are existing technologies known to those skilled in the art. Furthermore, the model parameters of the clamping and centering mechanism 3, the double-lip stainless steel PTFE skeleton oil seal 6 of the tool holder, 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. Electrical control components not mentioned in this technical solution are not shown in the figure because they are existing technologies, and will not be described further here.

[0116] Finally, it should be noted that the above description 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 foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for deburring and chamfering the end face of explosion-proof small-diameter metal pipes, characterized in that: Includes explosion-proof housing (1), base (2), clamping and centering mechanism (3), cutting tool (4), tool holder (5), double-lip stainless steel PTFE skeleton oil seal of tool holder (6), spring (7), thrust ball bearing (8) and linear bearing (9); The explosion-proof enclosure (1) is used to house the tube (0) and to fill the enclosed sealed chamber with non-flammable gas for deburring and chamfering operations. The base (2) is fixed to the lower part of the explosion-proof enclosure (1) to support the explosion-proof enclosure (1) and keep it stable; The clamping and centering mechanism (3) is set at one end of the explosion-proof housing (1) to clamp the pipe (0) and center it to ensure the quality of burr removal and chamfering operations; The cutting tool (4) is placed in the cavity of the explosion-proof housing (1). The cutting tool (4) is collinear 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) extends into the chamber of the explosion-proof housing (1), inserts and fixes the tool (4), and rotates during the burr removal and chamfering process for feeding and connection to external power; there is another tool holder (5) mirrored on 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 holder (5) is magnetic; a friction plate is provided between the two tool holders (5) to link them together for power transmission; The double-lip stainless steel PTFE skeleton oil seal (6) of the tool holder is assembled on the tool holder (5) for sealing between the tool holder (5) and the explosion-proof shell (1); The linear bearing (9) is located in the chamber opposite to the clamping and centering mechanism (3) and is used to assemble the tool holder (5) that extends into the explosion-proof housing (1). A spring (7) is mounted on a tool holder (5) that extends into the explosion-proof housing (1) so that the tool (4) can automatically reset after the feed pressure is reduced. The thrust ball bearing (8) is mounted on the tool holder (5) that extends into the explosion-proof housing (1) and is located outside the double-lip stainless steel PTFE skeleton oil seal (6) and inside the spring (7). The tube (0) is clamped at one end of the explosion-proof housing (1) by the clamping and centering mechanism (3), and the tool holder (5) of the insert tool (4) is set at the other end of the explosion-proof housing (1). Non-flammable gas is filled into the explosion-proof housing (1), and the tool holder (5) drives the tool (4) to perform burr removal and chamfering operations in the 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, characterized in that: The pipe (0) extends into the explosion-proof shell (1) and is provided with an internal pipe plug (01) and an external pipe plug (02) at the outer end of the pipe (0). Both the internal pipe plug (01) and the external pipe plug (02) are internal expansion type pipe plugs.

3. The explosion-proof small-diameter metal pipe end face burr removal and chamfering device according to claim 2, characterized in that: The explosion-proof housing (1) has a chamber at one end for housing the tube (0) and assembling the cutting tool (4); a pressure gauge (11) and an air filling valve (12) are provided in the radial direction of the chamber. The air filling valve (12) is used to connect to the 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-flammable gas filling. The explosion-proof housing (1) has a bearing through hole and a through hole boss at the other end for assembling and fixing the linear bearing (9), the double-lip stainless steel PTFE skeleton oil seal of the tool holder (6), the thrust ball bearing (8) and the spring (7).

4. The explosion-proof small-diameter metal pipe end face burr removal and chamfering device according to claim 3, characterized in that: The clamping and centering mechanism (3) is provided with a mechanical iris (31) at one end for centering the tube (0). The clamping and centering mechanism (3) is provided with a handle sealing port in the radial direction for operating the mechanical iris (31). A double-lip stainless steel PTFE skeleton oil seal (33) is provided on the outside 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, specifications and distribution of the positioning screw (32) are in various forms. The number must be ≥3 and evenly distributed. The screw tightening process requires synchronous feeding of 1 / 2 thread and does not affect 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, characterized in that: The mechanical iris (31) in the clamping and centering mechanism (3) can be an Archimedes spiral iris or other structures with a ring centering function; The mechanical iris (31) includes a chassis (311), a gear disc (312), a dial (313), and a blade (314), with a lever on the dial (313) extending outward through a lever sealing port.

6. The explosion-proof small-diameter metal pipe end face deburring and chamfering device according to claim 5, characterized in that: The tool holder (5) includes a feed rotary shaft (51) and a shoulder (52). The feed rotary shaft (51) is provided at one end of the tool holder (5), and the shoulder (52) is provided at the other end. A hexagonal connecting rod through hole (53) is provided in the middle of the tool holder (5). On the outer side of the shoulder (52), there are grooves (54) arranged with the hexagonal connecting rod through hole (53) as the center, for embedding magnets. In the tool holder (5) that extends into the explosion-proof housing (1), springs are sequentially mounted on the feed rotary shaft (51). Spring (7), thrust ball bearing (8) and tool holder double-lip stainless steel PTFE skeleton oil seal (6) are connected to linear bearing (9). The shank 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 thereto, is used to connect the hexagonal connecting rod. The hexagonal connecting rod is connected to a handle or power tool at the end to provide rotational power to drive the tool (4) to rotate. The feed rotation shaft (51) of the tool holder (5) is engraved with standard scale lines.

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

8. A method for removing burrs and chamfering the end face of an explosion-proof small-diameter metal pipe, characterized in that: The apparatus according to any one of claims 1-7 comprises the following steps: Step 1: Use vernier calipers to measure the outer diameter of the end face of the tube (0) to confirm the selection of the clamping and centering mechanism (3) and the specifications and dimensions of the sealing components. The mechanical iris (31) of the clamping and centering mechanism (3) must have sufficient extensibility to center and clamp the tube (0). Among the sealing components, the double-lip stainless steel PTFE skeleton oil seal (33) of the tube is matched with the tube (0), and the double-lip stainless steel PTFE skeleton oil seal (6) of the tool holder is matched with the tool holder 4. Use vernier calipers to measure the burr size of the end face of the tube (0) to confirm the deburring depth. Step 2: Based on the selected clamping and centering mechanism (3) specifications and the outer diameter of the end face of the pipe (0) to be processed, manufacture the explosion-proof shell (1), clamping and centering mechanism (3) and tool holder (5). Step 3: Pre-install the clamping and centering mechanism (3). The clamping and centering mechanism (3) uses a mechanical iris (31). The clamping is mainly done by using positioning screws (32) to tighten after centering. Step 4: Assemble the clamping centering mechanism (3), tool holder (5), tool (4), spring (7), linear bearing (9), thrust ball bearing (8), and explosion-proof housing (1). When assembling, a spring (7) with a suitable wire diameter should be selected to ensure sufficient rebound force, while avoiding the rebound force affecting the feed stroke of the tool holder (5). Assemble the magnet with the groove (54) of the tool holder (5) and fix it with quick-drying glue. When assembling, it is necessary to ensure that the magnetic guide line direction of each tool holder (5) in the two tool holders is consistent, and at the same time, it is necessary to ensure that the magnetic guide line direction of the two tool holders is opposite, so as to ensure that the magnets can attract each other. Select the appropriate number, diameter, and thickness of magnets according to the outer diameter, wall thickness, material hardness, and friction coefficient of the cutting tube (0). 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 cutting tool (4). Use the lever of the mechanical iris (31) to center the tube (0) and clamp the tube with the positioning screw (32). Connect the gas filling valve (12) at the lower end of the explosion-proof housing (1) to the gas source for pressurization and pressure maintenance. Fill in non-flammable gases such as carbon dioxide, argon, and nitrogen. Observe the pressure gauge (11) after filling / pressurizing. Step 6: Securely connect the manual rotating handle or the cordless electric drill to the hexagonal connecting rod of the tool holder (5). While rotating the tool holder (5), slowly press it in to grind the tool holder (5) forward, thus completing the burr removal and chamfering operation.

9. The method for removing burrs and chamfering the end face of an explosion-proof small-diameter metal pipe according to claim 8, characterized in that: In step five, after the tube (0) is inserted into the end face of the cutter and tightened, it needs to be pulled back 10-20mm. In step five, the device needs to be pressurized or gas-filled and sealed before construction, and the pressure gauge (11) needs to be dynamically monitored throughout the construction process. If the pressure drops or is insufficient, construction must be stopped. As long as the gas being filled is not flammable, it is not restricted. The filling method and filling valve are not restricted as long as they meet the pressure requirements. The pressure is >0.2 MPa. If the pressure gauge (11) drops suddenly during the construction process, construction must be stopped immediately, and the leak must be checked and repaired.

10. The method for removing burrs and chamfering the end face 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 batch feeding 2mm.

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