A pipe fitting weld cutting tool

Abstract

A pipe fitting weld cutting tool, which includes: a support seat for surrounding and mounting on the outer side of the pipe fitting to be cut, and the support seat is composed of a first support module and a second support module that are detachably connected; a fixing seat installed at one end of the support seat and for surrounding the pipe fitting to be cut, and the fixing seat is composed of a first fixing module and a second fixing module that are detachably connected; a cutting assembly, including a rotating gear, a guiding seat, a cutting tool, a radial transmission assembly and an axial transmission assembly; a rotating drive assembly, installed on the fixing seat and meshing with the rotating gear, for driving the rotating gear to rotate; a radial triggering assembly, installed on the support seat, for triggering the radial transmission assembly to drive the cutting tool to move radially when in a pressed state and when the rotating gear rotates. The pipe fitting weld cutting tool has the advantages of less occupied working space, high cutting precision, and convenient installation and disassembly.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe fitting processing, and particularly relates to a pipe fitting weld cutting tool. Background Art

[0002] The reactor core neutron flux measurement system (hereinafter referred to as RIC) measures the thermal neutron flux distribution of the reactor during the operation of a nuclear power plant and is one of the very important systems in the main system. The RIC usually includes 50 neutron flux guide tubes and 50 manual isolation valves. The 50 guide tubes are usually processed from the stainless steel material Z2CN18-10, are all in an "L" shape, have a length between 8 m and 11.5 m, are welded corresponding to the bottom pipe fittings of the pressure vessel at the upper end, and are welded corresponding to the upstream end of the manual isolation valve at the lower end. The manual isolation valve is a ball valve, usually made of the stainless steel material Z2CN18-10, and its downstream end is welded to the sealing section. Its function is to isolate and repair the RIC system under specific circumstances. When problems that cannot be repaired occur in the RIC manual isolation valve and the sealing section, it is necessary to use a pipe fitting weld cutting tool to cut and separate the guide tube and the manual isolation valve welded in the RIC in order to replace a new manual isolation valve.

[0003] Most of the existing pipe fitting weld cutting work is carried out by a machine tool for cutting or manually operating a small weld cutting machine by hand. Among them, the machine tool for machine tool cutting occupies a large space and is not suitable in the case of a narrow working space. Moreover, machine tool cutting of pipe fitting welds also requires that the pipe fitting to be processed can move itself and is not suitable when the pipe fitting to be processed is fixed; the cutting accuracy of manually operating a small weld cutting machine by hand is not high and the efficiency is low.

[0004] However, on the one hand, the 50 guide tubes in the RIC system are arranged in an array in space, and the interval between every two of the 50 guide tubes is only 120 mm, and the available space above and below each guide tube is only 350 mm. That is to say, the space where tools around the guide tube can be installed / operated is very narrow; in addition, the guide tube cannot move; therefore, the existing machine tool cutting is difficult to be used for cutting and separating the guide tube and the manual isolation valve. On the other hand, the guide tube is a non-replaceable part, and the weld type between the guide tube and the manual isolation valve is socket welding, and it is necessary to ensure that the base material of the guide tube is not damaged during the cutting process. However, there is also a weld penetration depth after the guide tube is welded, which requires a sufficiently high cutting accuracy. Obviously, the existing manually operated small weld cutting machine is also difficult to be used for cutting and separating the guide tube and the manual isolation valve. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a pipe fitting weld cutting tool that occupies less working space, has high cutting accuracy, and is convenient for installation and disassembly in view of the above problems in the prior art.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is to provide a pipe fitting weld cutting tool, including:

[0007] A support seat for surrounding and mounting on the outer side of the pipe fitting to be cut, and the support seat is composed of a first support module and a second support module that are detachably connected;

[0008] A fixing seat installed at one end of the support seat and for surrounding the pipe fitting to be cut, and the fixing seat is composed of a first fixing module and a second fixing module that are detachably connected;

[0009] A cutting assembly, including a rotating gear, a guide seat, a cutting tool, a radial transmission assembly, and an axial transmission assembly; the rotating gear is rotatably installed on the fixing seat around the axis of the pipe fitting to be cut, and the rotating gear is composed of two half-tooth rings that are detachably connected, and the two half-tooth rings are respectively accommodated in the first fixing module and the second fixing module; the guide seat is installed on the rotating gear, and the guide seat is composed of two guide blocks that are detachably connected; the cutting tool is movably installed on the guide seat along the radial or axial direction of the rotating gear; the radial transmission assembly is used to drive the cutting tool to move radially along the rotating gear under the action of an external force; the axial transmission assembly is used to drive the cutting tool to move axially along the rotating gear under the action of an external force;

[0010] A rotation drive assembly, installed on the fixing seat and meshing with the rotating gear, for driving the rotating gear to rotate;

[0011] A radial trigger assembly, installed on the support seat, for triggering the radial transmission assembly to drive the cutting tool to move radially when in a pressed state and when the rotating gear rotates.

[0012] In the pipe fitting weld cutting tool provided by the present invention, an axial trigger assembly is further included, installed on the support seat, for triggering the axial trigger assembly to drive the cutting tool to move axially when in a pressed state and when the rotating gear rotates.

[0013] In the pipe fitting weld cutting tool provided by the present invention, the cutting assembly includes two cutting tools, two sets of radial transmission assemblies, and two sets of axial transmission assemblies; the two cutting tools are respectively movably installed on the two guide blocks along the radial or axial direction of the rotating gear; the two sets of radial transmission assemblies are respectively connected to the two cutting tools, for respectively driving the corresponding cutting tool to move radially along the rotating gear; the two sets of axial transmission assemblies are respectively connected to the two cutting tools, for respectively driving the corresponding cutting tool to move axially along the rotating gear.

[0014] In the pipe fitting weld cutting tool provided by the present invention, the radial transmission assembly includes:

[0015] The feeding slider is installed on the guiding block so as to be movable along the radial direction of the rotating gear.

[0016] The feeding rack is installed on the guiding block so as to be movable along the radial direction of the rotating gear and is used for being pushed by the radial triggering assembly.

[0017] The connecting assembly has one end meshed with the feeding rack and the other end abutted against the feeding slider, and is used for driving the feeding slider to move radially when the radial triggering assembly pushes the feeding rack.

[0018] In the pipe weld cutting tool provided by the present invention, the connecting assembly includes a connecting shaft rotatably penetrating through the feeding slider, a feeding gear sleeved on the lower end of the connecting shaft, and a feeding cam sleeved on the connecting shaft; a feeding pin shaft is fixed on the feeding slider; the cam abuts against the feeding pin shaft, and the feeding gear is meshed with the feeding rack; the cam is used for pushing the feeding pin shaft when rotating from a first position to a second position under the drive of the feeding gear so that the feeding slider moves a certain distance along the radial direction of the rotating gear towards the pipe to be cut.

[0019] In the pipe weld cutting tool provided by the present invention, the radial transmission assembly further includes a return spring, and opposite ends of the return spring respectively abut against the feeding slider and the corresponding guiding block; the feeding slider is used for compressing the return spring when moving along the radial direction of the rotating gear towards the pipe to be cut; the return spring is used for pushing the feeding slider to move along the radial direction of the rotating gear away from the pipe to be cut when the cam rotates from the second position to the first position under the drive of the feeding gear.

[0020] In the pipe weld cutting tool provided by the present invention, the axial transmission assembly includes:

[0021] A tool slider is installed on the feeding slider.

[0022] A tool holder, for installing and fixing the cutting tool, is installed on the tool slider so as to be movable along the axial direction of the rotating gear.

[0023] A feeding lead screw is rotatably installed on the tool slider, one end of which extends into the tool holder and is in threaded connection with the tool holder, and the other end is exposed outside the tool slider.

[0024] In the pipe weld cutting tool provided by the present invention, the axial transmission assembly further includes a feeding star wheel sleeved on the other end of the feeding lead screw and used for being pushed by the axial triggering assembly.

[0025] In the pipe fitting weld cutting tool provided by the present invention, the cutting tool includes a grooving tool and a beveling tool; the grooving tool and the beveling tool are respectively installed on the two guiding blocks.

[0026] In the pipe fitting weld cutting tool provided by the present invention, the first support module includes a first fixing rod, and a first end support block and a first middle support block are sleeved on the first fixing rod at intervals; the second support module includes a second fixing rod, and a second end support block and a second middle support block are sleeved on the second fixing rod at intervals;

[0027] The first end support block and the second end support block, the first middle support block and the second middle support block are respectively detachably connected through a locking component;

[0028] The ends of the first fixing rod and the second fixing rod are respectively connected to the first fixing module and the second fixing module;

[0029] The rotary driving component is installed on the first fixing module;

[0030] The radial triggering component and the axial triggering component are arranged on the second fixing rod at intervals.

[0031] Implementing the pipe fitting weld cutting tool provided by the present invention can achieve the following beneficial effects:

[0032] 1. It occupies less working space, has high cutting precision, and is convenient for installation and disassembly;

[0033] 2. It can prevent the cutting tool from moving excessively towards the pipe fitting to be cut, prevent the cutting tool from damaging the pipe fitting to be cut (i.e., the guiding pipe), and ensure that the guiding pipe body is not mis-cut due to human operation factors;

[0034] 3. The cutting tool includes a grooving tool and a beveling tool; the grooving tool and the beveling tool are respectively installed on the two guiding blocks. The center lines of the grooving tool and the beveling tool are coincident. When performing cutting operations, it is ensured that the grooving tool advances first and the beveling tool feeds subsequently, so as to realize grooving and beveling simultaneously, and the weld cutting and beveling processing can be completed at one time;

[0035] 4. The axial feed of the cutting tool can be realized manually or automatically;

[0036] 5. Grooves are provided on the first fixing rod and the second fixing rod to facilitate the positioning and installation of the first middle support block and the second middle support block. Through the dimension design of the first fixing rod and the second fixing rod and the position design of the grooves, it can be ensured that when the first middle support block and the second middle support block clamp the outside of the manual isolation valve, the position of the cutting tool can be aligned with the required cutting position of the weld, without repeated adjustment;

[0037] 6. By precisely designing and machining the feed rack, feed gear, and feed cam, the maximum radial cutting depth can be controlled to ensure that the base material of the guide tube is not damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A three-dimensional exploded view of the pipe weld cutting tool provided by the present invention;

[0039] Figure 2 A cross-sectional view of the pipe weld cutting tool provided by the present invention;

[0040] Figure 3 A partial cross-sectional view of the pipe weld cutting tool provided by the present invention;

[0041] Figure 4 A reference view of the usage state of the pipe weld cutting tool provided by the present invention.

[0042] Explanation of the reference numerals in the drawings of the specific embodiments:

[0043]

[0044] SPECIFIC EMBODIMENTS

[0045] For a clearer understanding of the technical features, objectives, and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the scope of protection of the present invention.

[0046] This embodiment provides a pipe weld cutting tool. It is particularly suitable for cutting the weld between the guide tube and the manual isolation valve in the core neutron flux measurement system.

[0047] In this embodiment, refer to Figure 1 and Figure 2, the pipe fitting weld cutting tool includes a support base, a fixed base, a cutting assembly, a rotary drive assembly, and a radial trigger assembly. The support base is used for surrounding and mounting on the outer side of the pipe fitting to be cut, and the support base is composed of a first support module and a second support module that are detachably connected. The fixed base is installed at one end of the support base and is used for surrounding the pipe fitting to be cut, and the fixed base is composed of a first fixed module and a second fixed module that are detachably connected. The cutting assembly includes a rotary gear 2, a guide seat 29, a cutting knife 36, a radial transmission assembly, and an axial transmission assembly. The rotary gear 2 is rotatably installed on the fixed base around the axis of the pipe fitting to be cut, and the rotary gear 2 is composed of two half gear rings 20, 21 that are detachably connected. The two half gear rings 20, 21 are respectively accommodated in the first fixed module and the second fixed module; the guide seat 29 is installed on the rotary gear 2, and the guide seat 29 is composed of two guide blocks 29a, 29b that are detachably connected; the cutting knife 36 is movably installed on the guide seat 29 along the radial or axial direction of the rotary gear 2; the radial transmission assembly is used for driving the cutting knife 36 to move radially along the rotary gear 2 under the action of an external force; the axial transmission assembly is used for driving the cutting knife 36 to move axially along the rotary gear 2 under the action of an external force. The rotary drive assembly is installed on the fixed base and meshes with the rotary gear 2 to drive the rotary gear 2 to rotate. The radial trigger assembly is installed on the support base and is used for triggering the radial transmission assembly to drive the cutting knife 36 to move radially when in a pressed state and when the rotary gear 2 rotates.

[0048] In this embodiment, the first support module includes a first fixing rod 41a, on which a first end support block 47 and a first intermediate support block 42a are sleeved at intervals; the second support module includes a second fixing rod 41b, on which a second end support block 48 and a second intermediate support block 42b are sleeved at intervals; the first end support block 47 is detachably connected to the second end support block 48, the first intermediate support block 42a and the second intermediate support block 42b respectively through a locking assembly; the ends of the first fixing rod 41a and the second fixing rod 41b are respectively connected to the first fixing module and the second fixing module. Specifically, when the pipe weld cutting tool needs to be installed on the pipe to be cut, the two ends of the first end support block 47 and the two ends of the second end support block 48 are tightly connected through a locking assembly respectively, the two ends of the first intermediate support block 42a and the two ends of the second intermediate support block 42b are tightly connected through a locking assembly respectively, and the two ends of the first fixing module and the second fixing module are tightly connected through a locking assembly respectively. Taking the locking assembly for connecting the first end support block 47 and the second end support block 48 as an example, the structure of the locking assembly is described. The locking assembly includes a connecting rod 14 with an external thread. One end of the connecting rod 14 is rotatably connected to an ear at one end of the first end support block 47, and a pressing nut 15 is threadedly connected to the other end. When the first end support block 47 and the second end support block 48 need to be connected, first align the first end support block 47 and the second end support block 48, then insert the connecting rod 14 connected to the first end support block 47 into the ear at one end of the second end support block 48, and then screw the pressing nut 15 so that the pressing nut 15 tightly presses against the ear at one end of the second end support block 48, thereby realizing the connection between the first end support block 47 and the second end support block 48.

[0049] In some other embodiments, the two ends of the first end support block 47 and the two ends of the second end support block 48 can also be directly tightly connected by screws. Similarly, the two ends of the first intermediate support block 42a and the two ends of the second intermediate support block 42b, as well as the two ends of the first fixing module and the second fixing module, can all be directly tightly connected by screw members.

[0050] In this embodiment, the rotating gear 2 and the fixed seat are connected through a plurality of annularly arranged bearings 19, so as to realize the rotational mounting of the rotating gear 2 on the fixed seat.

[0051] In this embodiment, the rotary drive assembly is installed on the first fixed module. The rotary drive assembly includes a motor mounting base 4, a pneumatic motor 3, and a transmission gear 5. The motor mounting base 4 is fixed on the first fixed module, the pneumatic motor 3 is installed on the motor mounting base 4, and the transmission gear 5 is connected to the output shaft of the pneumatic motor 3 and meshes with the rotary gear 2. Thus, when the pneumatic motor 3 operates, it can drive the rotary gear 2 to rotate. In addition, the pneumatic motor 3 is arranged below the side of the entire pipe weld cutting tool, which can reduce its interference with on-site operations. To reduce noise, a silencer 1 can also be installed on the pneumatic motor 3.

[0052] In this embodiment, the radial drive assembly includes a feed slider 31, a feed rack 23, and a connection assembly. The feed slider 31 is installed on the guide blocks 29a and 29b so as to be movable along the radial direction of the rotary gear 2; the feed rack 23 is installed on the guide blocks 29a and 29b so as to be movable along the radial direction of the rotary gear 2. The outer end of the feed rack 23 protrudes from the guide blocks 29a and 29b for being pushed by the radial trigger assembly, and the inner end of the feed rack 23 is elastically connected to the guide blocks 29a and 29b through a second spring 22; one end of the connection assembly meshes with the feed rack 23 and the other end abuts against the feed slider 31, and is used for driving the feed slider 31 to move radially when the radial trigger assembly pushes the feed rack 23. The connection assembly includes a connection shaft 25 rotatably passing through the feed slider 31, a feed gear 24 sleeved on the lower end of the connection shaft 25, and a feed cam 30 sleeved on the connection shaft 25; a feed pin 33 is fixed on the feed slider 31; the cam abuts against the feed pin 33, and the feed gear 24 meshes with the feed rack 23; see Figure 3, when the feed rack 23 is affected by an external force and moves towards the pipe fitting to be cut, it can drive the cam to rotate from the first position to the second position; it can be understood that when the feed rack 23 is affected by an external force and moves towards the pipe fitting to be cut, it will also compress the second spring 22, and when the external force acting on the feed rack 23 disappears, the second spring 22 will push the feed rack 23 to move away from the pipe fitting to be cut to the initial position; the cam is used to push the feed pin 33 during the process of rotating from the first position to the second position under the drive of the feed gear 24 so that the feed slider 31 moves a certain distance along the radial direction of the rotating gear 2 towards the pipe fitting to be cut. Those skilled in the art should understand that when the cam is in the first position, the distance from the contact point between the feed pin 33 and the cam to the rotation center of the cam is the smallest, and when the cam is in the second position, the distance from the contact point between the feed pin 33 and the cam to the rotation center of the cam is the largest. Thus, when the cam rotates from the first position to the second position, it can push the feed pin 33 so that the feed slider 31 moves a certain distance along the radial direction of the rotating gear 2 towards the pipe fitting to be cut. Moreover, through the precise design and precise machining of the feed rack 23, the feed gear 24 and the feed cam 30, the radial feed accuracy can be controlled to reach 0.02 mm and the maximum radial cutting depth.

[0053] In this embodiment, the axial transmission assembly includes a tool slider 34, a tool holder 35 and a feed screw 37. The tool slider 34 is installed on the feed slider 31; the tool holder 35 is used for installing and fixing the cutting tool 36 and is installed on the tool slider 34 so as to be movable along the axial direction of the rotating gear 2; the feed screw 37 is rotatably installed on the tool slider 34, one end extends into the tool holder 35 and is threadedly connected with the tool holder 35, and the other end is exposed outside the tool slider 34. The axial transmission assembly further includes a feed star wheel 40, and the feed star wheel 40 is sleeved on the other end of the feed screw 37 and is used for being pushed by the axial trigger assembly. In this way, rotating the feed star wheel 40 can drive the cutting tool 36 to move axially along with the tool holder 35. Moreover, through the precise design and precise machining of the feed star wheel 40 and the feed screw 37, the axial feed accuracy can be controlled to reach 0.05 mm.

[0054] In this embodiment, the radial trigger assembly is disposed on the second fixing rod 41b. The radial trigger assembly includes a radial trigger rod 52 passing through the first fixing rod 41a. Opposite ends of the radial trigger rod 52 are exposed from the first fixing rod 41a. The radial trigger rod 52 and the feed rack 23 are in the same plane parallel to the rotating gear 2. The radial trigger rod 52 is configured to extend into the rotation path of the feed rack 23 under the action of an external force. It can be understood that when the radial trigger assembly is in the depressed state, the radial trigger rod 52 is located in the rotation path of the feed rack 23. Thus, when the radial trigger assembly is in the depressed state, when the feed rack 23 rotates with the rotating gear 2 and rotates to contact the radial trigger rod 52, the feed rack 23 can move radially under the action of the radial trigger rod 52, thereby driving the cam to rotate from the first position to the second position.

[0055] See Figure 4 , when using the pipe joint weld cutting tool to cut the weld between the guide pipe and the manual isolation valve, first install and fix the first support module and the second support module on the manual isolation valve, then install the first fixing module and the second fixing module on the first support module and the second support module respectively, and connect and fix the first fixing module and the second fixing module to form the fixing seat, and then surround and fix the fixing seat on the outside of the guide pipe, so as to complete the installation of the pipe joint weld cutting tool. After the installation is completed, adjust the radial trigger assembly to the depressed state, and then start the rotary drive assembly to make the rotating gear 2 rotate around the axis of the guide pipe. When the rotating gear 2 rotates, on the one hand, it triggers the radial drive assembly to drive the cutting tool 36 to move radially, so that the cutting tool 36 radially cuts into a certain position of the weld between the guide pipe and the manual isolation valve part, and on the other hand, it also drives the cutting tool 36 to rotate around the axis of the guide pipe. Thus, the cutting tool 36 cuts into the weld from a certain position of the weld. When the cutting depth of the weld reaches the designed depth and it is necessary to change the feed direction of the cutting tool 36, the axial drive assembly can be manually toggled to make the cutting tool 36 move axially, so that the entire weld between the guide pipe and the manual isolation valve can be accurately cut off, and the separation from the manual isolation valve can be completed without damaging the guide pipe.

[0056] In summary, the pipe joint weld cutting tool provided in this embodiment has the advantages of less occupied working space, high cutting accuracy, and convenient installation and disassembly.

[0057] Further, the radial drive assembly further includes a return spring 27, and opposite ends of the return spring 27 respectively abut against the feed slider 31 and the corresponding guide blocks 29a and 29b; the feed slider 31 is configured to compress the return spring 27 during the movement along the radial direction of the rotary gear 2 toward the pipe to be cut; the return spring 27 is configured to push the feed slider 31 to move along the radial direction of the rotary gear 2 away from the pipe to be cut during the process that the cam rotates from the second position to the first position driven by the feed gear 24. In this way, it is possible to prevent the cutting tool 36 from moving excessively toward the pipe to be cut, prevent the cutting tool 36 from damaging the pipe to be cut (i.e., the guide pipe), and ensure that the guide pipe body is not accidentally cut due to human operation factors.

[0058] Further, the cutting assembly includes two cutting tools 36, two sets of radial drive assemblies, and two sets of axial drive assemblies; the two cutting tools 36 are respectively mounted on the two guide blocks 29a and 29b so as to be movable along the radial or axial direction of the rotary gear 2; the two sets of radial drive assemblies are respectively connected to the two cutting tools 36 and are configured to drive the corresponding cutting tools 36 to move along the radial direction of the rotary gear 2; the two sets of axial drive assemblies are respectively connected to the two cutting tools 36 and are configured to drive the corresponding cutting tools 36 to move along the axial direction of the rotary gear 2. The cutting tool 36 includes a grooving tool and a beveling tool; the grooving tool and the beveling tool are respectively mounted on the two guide blocks 29a and 29b. The centerlines of the grooving tool and the beveling tool coincide. During the cutting operation, it is ensured that the grooving tool feeds first and the beveling tool feeds later, so as to achieve grooving and beveling simultaneously, and the weld cutting and beveling processing can be completed at one time. By precisely designing and precisely machining the grooving tool, the weld cutting length is controlled to be 1.5 mm. By precisely designing and precisely machining the beveling tool, it is ensured that the angle of the beveling tool is consistent with the weld bevel angle.

[0059] Further, the pipe fitting weld cutting tool further includes an axial trigger assembly installed on the support base for triggering the axial movement of the cutting tool 36 driven by the axial trigger assembly when in the pressed state and when the rotating gear 2 rotates. Specifically, the axial trigger assembly is arranged on the second fixed rod 41b. The axial trigger assembly includes an axial trigger rod 51 penetrating through the first fixed rod 41a. Opposite ends of the axial trigger rod 51 are exposed outside the first fixed rod 41a. The axial trigger rod 51 and the feed star wheel 40 are located in the same plane parallel to the rotating gear 2. The radial trigger rod 52 is configured to extend to the rotation path of the feed star wheel 40 under the action of an external force. It can be understood that the axial trigger rod 51 is located on the rotation path of the feed star wheel 40 when the axial trigger assembly is in the pressed state. Thus, when the axial trigger assembly is in the pressed state, when the feed star wheel 40 rotates with the rotating gear 2 and rotates to contact the axial trigger rod 51, the feed star wheel 40 can rotate automatically under the action of the axial trigger rod 51, thereby driving the cutting tool 36 to axially move along with the tool holder 35. It is not difficult to find that we can achieve the automatic axial feed of the cutting tool 36 by means of the pneumatic motor 3.

[0060] Further, a first pressing assembly is provided on the first end support block 47. The first end support block 47 has a first cavity with an opening facing inward. The first pressing assembly includes a first pressing block 441 movably arranged in the first cavity of the first end support block 47 along the radial direction of the rotating gear 2 and a first adjusting rod 442 rotatably installed on the first end support block 47. The first adjusting rod 442 is threadedly connected to the first pressing block 441. When the first adjusting rod 442 rotates, it drives the first pressing block 441 to move along the radial direction of the rotating gear 2. The second end support block 48 is provided with a second pressing assembly. The second end support block 48 has a second cavity with an opening facing inward, and the second cavity is aligned with the first cavity. The second pressing assembly includes a second pressing block 461 movably arranged in the second cavity of the second end support block 48 along the radial direction of the rotating gear 2 and a second adjusting rod 462 rotatably installed on the second end support block 48. The second adjusting rod 462 is threadedly connected to the second pressing block 461. When the second adjusting rod 462 rotates, it drives the second pressing block 461 to move along the radial direction of the rotating gear 2. Thus, by adjusting the first adjusting rod 442 and the second adjusting rod 462, the first pressing block 441 and the second pressing block 461 can jointly clamp the manual isolation valve, thereby ensuring that the first end support block 47 and the second end support block 48 can more firmly hold the outside of the manual isolation valve.

[0061] Further, the first intermediate support block 42a is provided with a third pressing assembly. The first intermediate support block 42a has a third cavity with an opening facing inward. The third pressing assembly includes a third pressing block 431 disposed in the third cavity of the first intermediate support block 42a and movable along the radial direction of the rotating gear 2, and a third adjusting rod 432 rotatably mounted on the first intermediate support block 42a. The third adjusting rod 432 is threadedly connected to the third pressing block 431. When the third adjusting rod 432 rotates, it drives the third pressing block 431 to move along the radial direction of the rotating gear 2. The second intermediate support block 42b is provided with a fourth pressing assembly. The second intermediate support block 42b has a fourth cavity with an opening facing inward, and the fourth cavity is aligned with the third cavity. The fourth pressing assembly includes a fourth pressing block 451 disposed in the fourth cavity of the second intermediate support block 42b and movable along the radial direction of the rotating gear 2, and a fourth adjusting rod rotatably mounted on the second intermediate support block 42b. The fourth adjusting rod is threadedly connected to the fourth pressing block 451. When the fourth adjusting rod rotates, it drives the fourth pressing block 451 to move along the radial direction of the rotating gear 2. Thus, by adjusting the third adjusting rod 432 and the fourth adjusting rod, the third pressing block 431 and the fourth pressing block 451 can jointly clamp the manual isolation valve, ensuring that the first intermediate support block 42a and the second intermediate support block 42b can more firmly hold the outside of the manual isolation valve.

[0062] Further, grooves can be provided on the first fixing rod 41a and the second fixing rod 41b to facilitate the positioning and installation of the first intermediate support block 42a and the second intermediate support block 42b. Through the dimension design of the first fixing rod 41a and the second fixing rod 41b and the position design of the grooves, it can be ensured that when the first intermediate support block 42a and the second intermediate support block 42b are clamped outside the manual isolation valve, the position of the cutting tool 36 can be aligned with the required cutting position of the weld seam.

[0063] Further, the pipe weld cutting tool further includes an elastic bushing 11 for clamping between the fixed seat and the pipe to be cut. The elastic bushing 11 has a split structure and is composed of two symmetrically arranged cylindrical pieces. Through the self-centering principle of the tapered elastic bushing 11, it can be ensured that the rotation axis of the rotating gear 2 coincides with the axis of the guide pipe. Further, a locking nut 10 can be provided on the outer side of the elastic bushing 11. The outer peripheral side of the locking nut 10 is threadedly connected to the fixed seat, which can prevent the elastic bushing 11 from undergoing axial displacement. It should be understood that for the convenience of installation, the locking nut 10 also adopts a split structure.

[0064] Furthermore, a convex ring 521 is provided on the circumference of the radial trigger rod 52, and a first spring 522 is provided between the side of the convex ring 521 facing the pipe to be cut and the first fixing rod 41a; the radial trigger assembly also includes a locking rod 523 that can be movably penetrated through the first fixing rod 41a, and the locking rod 523 abuts against the side of the convex ring 521 that is away from the pipe to be cut when in the locked position. In this way, by simply pulling the locking rod 523, the radial trigger rod 52 can move in a direction away from the guide tube under the action of the first spring 522, so that the radial trigger rod 52 is no longer located on the rotation path of the feed rack 23, thereby stopping cutting.

[0065] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A pipe fitting weld cutting tool, characterized in that, Comprising: A support seat for surrounding and mounting on the outer side of the pipe fitting to be cut, the support seat being composed of a first support module and a second support module which are detachably connected; A fixing seat mounted at one end of the support seat and for surrounding the pipe fitting to be cut, the fixing seat being composed of a first fixing module and a second fixing module which are detachably connected; A cutting assembly, including a rotating gear (2), a guide seat (29), a cutting tool (36), a radial transmission assembly and an axial transmission assembly; the rotating gear (2) is rotatably mounted on the fixing seat around the axis of the pipe fitting to be cut, the rotating gear (2) is composed of two half gear rings (20, 21) which are detachably connected, and the two half gear rings (20, 21) are respectively accommodated in the first fixing module and the second fixing module; the guide seat (29) is mounted on the rotating gear (2), and the guide seat (29) is composed of two guide blocks (29a, 29b) which are detachably connected; the cutting tool (36) is movably mounted on the guide seat (29) along the radial or axial direction of the rotating gear (2); the radial transmission assembly is used for driving the cutting tool (36) to move along the radial direction of the rotating gear (2) under the action of an external force; the axial transmission assembly is used for driving the cutting tool (36) to move along the axial direction of the rotating gear (2) under the action of an external force; A rotary drive assembly, mounted on the fixing seat and meshing with the rotating gear (2), for driving the rotating gear (2) to rotate; A radial trigger assembly, mounted on the support seat, for triggering the radial transmission assembly to drive the cutting tool (36) to move radially when in a pressed state and when the rotating gear (2) rotates; Further comprising an axial trigger assembly, mounted on the support seat, for triggering the axial trigger assembly to drive the cutting tool (36) to move axially when in a pressed state and when the rotating gear (2) rotates; The cutting assembly includes two cutting tools (36), two sets of radial transmission assemblies and two sets of axial transmission assemblies; the two cutting tools (36) are respectively movably mounted on the two guide blocks (29a, 29b) along the radial or axial direction of the rotating gear (2); the two sets of radial transmission assemblies are respectively connected to the two cutting tools (36), for respectively driving the corresponding cutting tool (36) to move along the radial direction of the rotating gear (2); the two sets of axial transmission assemblies are respectively connected to the two cutting tools (36), for respectively driving the corresponding cutting tool (36) to move along the axial direction of the rotating gear (2).

2. The pipe fitting weld cutting tool according to claim 1, characterized in that, The radial transmission assembly includes: A feed slider (31), movably mounted on the guide block (29a, 29b) along the radial direction of the rotating gear (2); A feed rack (23), movably mounted on the guide block (29a, 29b) along the radial direction of the rotating gear (2), for being pushed by the radial trigger assembly; A connecting component, one end of which meshes with the feed rack (23) and the other end of which abuts against the feed slider (31), is configured to drive the feed slider (31) to move radially when the radial triggering component pushes against the feed rack (23).

3. The pipe fitting weld cutting tool according to claim 2, characterized in that The connecting component includes a connecting shaft (25) rotatably disposed through the feed slider (31), a feed gear (24) sleeved on the lower end of the connecting shaft (25), and a feed cam (30) sleeved on the connecting shaft (25); a feed pin shaft (33) is fixed on the feed slider (31); the cam abuts against the feed pin shaft (33), and the feed gear (24) meshes with the feed rack (23); the cam is configured to push against the feed pin shaft (33) during the process of rotating from a first position to a second position under the drive of the feed gear (24) so that the feed slider (31) moves a certain distance radially toward the pipe to be cut along the rotating gear (2).

4. The pipe fitting weld cutting tool according to claim 3, characterized in that, The radial transmission component further includes a return spring (27), and opposite ends of the return spring (27) respectively abut against the feed slider (31) and the corresponding guide blocks (29a, 29b); the feed slider (31) is configured to compress the return spring (27) during the process of moving radially toward the pipe to be cut along the rotating gear (2); the return spring (27) is configured to push the feed slider (31) to move radially away from the pipe to be cut along the rotating gear (2) during the process of the cam rotating from the second position to the first position under the drive of the feed gear (24).

5. The pipe fitting weld cutting tool according to claim 2, wherein The axial transmission component includes: A tool slider (34), which is installed on the feed slider (31); A tool holder (35) for installing and fixing the cutting tool (36), and is installed on the tool slider (34) so as to be movable along the axis of the rotating gear (2); A feed lead screw (37), which is rotatably installed on the tool slider (34), one end of which extends into the tool holder (35) and is threadedly connected to the tool holder (35), and the other end of which is exposed outside the tool slider (34).

6. The pipe fitting weld cutting tool according to claim 5, characterized in that, The axial transmission component further includes a feed star wheel (40), which is sleeved on the other end of the feed lead screw (37) and is configured to be pushed by the axial triggering component.

7. The pipe fitting weld cutting tool according to claim 1, characterized in that, The cutting tool (36) includes a grooving tool and a beveling tool; the grooving tool and the beveling tool are respectively installed on the two guide blocks (29a, 29b).

8. The pipe fitting weld cutting tool according to claim 6, characterized in that, The first support module includes a first fixing rod (41a), and a first end support block (47) and a first intermediate support block (42a) are sleeved on the first fixing rod (41a) at intervals; the second support module includes a second fixing rod (41b), and a second end support block (48) and a second intermediate support block (42b) are sleeved on the second fixing rod (41b) at intervals; The first end support block (47) and the second end support block (48), the first intermediate support block (42a) and the second intermediate support block (42b) are respectively detachably connected by a locking component; The ends of the first fixing rod (41a) and the second fixing rod (41b) are respectively connected to the first fixing module and the second fixing module; The rotation driving assembly is installed on the first fixing module; The radial triggering assembly and the axial triggering assembly are arranged on the second fixing rod (41b) at intervals.

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