A plasma cutting device for the production of expansion joints

Abstract

The present invention relates to the technical field of plasma cutting, and specifically to a plasma cutting device for the production of expansion joints, which includes a plasma arc gun and an arc intercepting integrator for intercepting the scattered branches on the periphery of the plasma arc beam emitted by the plasma arc gun. The arc intercepting integrator includes a disc frame, an external gear ring, a module device, a rail frame, and an inner core cooling device. The channel cylinder body is spliced by multiple evenly arranged core blocks. The plasma arc beam passes through the inside of the channel cylinder body. If there are scattered branches on the periphery of the plasma arc beam, the branches will be intercepted by the channel cylinder body, and the remaining densely gathered plasma arc beam passes through the intercepting cylinder body and then penetrates the workpiece plate, making the edge of the cut workpiece plate smoother and neater.

Description

Technical Field

[0001] The present invention relates to the technical field of plasma cutting, and particularly to a plasma cutting device for the production of expansion joints. Background Art

[0002] During the process of enterprise production and processing of expansion joints, a plasma cutting process is involved. Plasma arc cutting is to pass a mixed gas through a high-frequency arc. The high-frequency arc decomposes or ionizes some gases into basic atomic particles, thereby generating plasma. Then the arc jumps to the stainless steel workpiece, and the high-pressure gas blows the plasma out of the cutting torch nozzle. The high energy released when the gas in the plasma returns to the normal state generates a high temperature, which is almost twice the melting point of stainless steel, thus quickly melting the stainless steel.

[0003] During plasma arc cutting, the plasma arc emission gun emits a plasma arc, and the plasma arc beam with impact force penetrates the workpiece plate. In order to make the edge of the cut workpiece smoother and neater, the plasma arc beam needs to be concentrated into a thin beam with concentrated energy. The plasma arc beam emitted by the plasma arc emission gun can pass through the inner hole of the intercepting cylinder. If there are scattered branches around the plasma arc beam, the arc branches will be intercepted by the intercepting cylinder. In this way, only the part with concentrated energy remains in the plasma arc beam passing through the inside of the intercepting cylinder. When the concentrated plasma arc beam cuts the workpiece plate, the edge of the cut plate will be smoother and neater. However, when the intercepting cylinder contacts the scattered branches of the high-temperature plasma arc beam, the intercepting cylinder will gradually heat up. If it is not replaced in time, the overheated intercepting cylinder will be damaged by the impact.

[0004] Based on the purpose of eliminating the scattered branches around the plasma arc beam, the present invention provides a plasma cutting device for the production of expansion joints. Summary of the Invention

[0005] The purpose of the present invention is to provide a plasma cutting device for the production of expansion joints to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A plasma cutting device for the production of expansion joints includes a plasma arc emission gun and an arc intercepting integrator for intercepting the scattered branches around the plasma arc beam emitted by the plasma arc emission gun. The arc intercepting integrator includes:

[0007] A disk frame fixed on the plasma arc emission gun, and the plasma arc beam emitted by the plasma arc emission gun passes through the central hole on the disk frame.

[0008] An external gear ring provided around the edge of the disk frame, and the external gear ring is stuck in the annular groove opened on the side wall of the edge of the disk frame.

[0009] A plurality of module devices evenly arranged in a ring are driven under the outer gear ring, and the plurality of module devices form a channel for the plasma arc to pass through at the convergence point, and the peripheral random branches of the plasma arc beam are intercepted by the channel;

[0010] A rail frame used to guide the module devices to gather together, one end of the rail frame is fixed on the disk frame, and one side of each module device is correspondingly distributed with a rail frame;

[0011] The module device is provided with an inner core cooling device, which blows air to cool down the components replaced from the channel on the module device.

[0012] The module device comprises:

[0013] The unit piles are fixed on the disc frame, and the worm and the flat shaft are supported on the unit piles, one end of the worm is meshed and connected with the outer gear ring through a fixed gear, and the spiral teeth on the worm are meshed and connected with the gear fixed at one end of the flat shaft;

[0014] A module stand is fixed at the other end of the horizontal axis, and a plurality of local modules are evenly arranged around the edge of the module stand.

[0015] The local module includes:

[0016] A circular shaft movably sleeved in a through hole provided on the module vertical plate, and a cam weight block fixed at one end of the circular shaft;

[0017] The channel unit element supported by the other end of the circumferential shaft.

[0018] The channel unit component includes a T-seat fixedly connected to the circulating shaft, a telescopic plate that slides and telescopes in a plate groove opened on the T-seat, a core block fixed at one end of the telescopic plate, a sliding resistance plate vertically fixed at one side of the telescopic plate, a spring supported between the T-seat and the telescopic plate, and a direction rod passing through the inside of the spring, wherein the direction rod slides through a column hole opened on the T-seat, and one end of the direction rod is fixed on the telescopic plate.

[0019] The core block is in the shape of a fan-shaped block. A plurality of evenly arranged core blocks are butt-jointed to form a channel cylinder for intercepting peripheral random branches of a plasma arc beam, and the remaining concentrated plasma arc passes through the inside of the channel cylinder and penetrates the workpiece plate. The rail frame includes a column and an L-shaped baffle fixed on one side of the column. The sliding resistance plate that moves around is blocked by the rail frame column, and the sliding resistance plate rises along the channel between the rail frame column and the L-shaped baffle, and the channel cylinder formed by butt-jointing the core blocks is controlled by the telescopic plate to move axially.

[0020] The inner core cooling device includes an outer ring cylinder gear fixed on the middle of the module vertical plate, a plurality of unit arc plates evenly arranged outside the outer ring cylinder gear, a cylindrical box for blowing air to the inner wall of the channel on the core block, an airway device for supplying air to the cylindrical box, and a linkage device for establishing a transmission between the outer ring cylinder gear and the airway device. The unit arc plate is fixed on the module vertical plate, and a plurality of air holes are provided on the shell of the cylindrical box facing the core block.

[0021] The airway device includes a flat tube with one end fixedly connected to the cylindrical box, a wind box fixedly connected to the other end of the flat tube, a fan arranged in the wind box, and an actuating shaft fixed in the middle of the fan, the actuating shaft is movably sleeved in a through hole opened in the middle of the bottom plate at one end of the wind box, the other end of the wind box is fixedly connected to a hard pipe, and the hard pipe is fixed on the unit pile column.

[0022] The linkage device comprises an integrated frame with one end fixed on the wind box, a temporary driving group supported by the other end of the integrated frame, and a speed increasing group for establishing transmission between the driving shaft and the temporary driving group.

[0023] The speed increasing group includes a driving shaft cylinder movably sleeved in a through hole provided on the integrated frame, a speed increasing gear with a fixed sleeve at one end of the driving shaft cylinder, a side control shaft also movably sleeved in a column hole provided on the integrated frame, and an acceleration gear with a fixed sleeve on the side control shaft. The end of the driving shaft is meshed and connected to the acceleration gear through a fixed gear, and the side control shaft is meshed and connected to the speed increasing gear through a fixed cylinder gear.

[0024] The temporary driving group includes an adjusting frame, a linkage column gear supported at one end of the adjusting frame, a return spring connected between the adjusting frame and the integrated frame, a pressure control rod sliding through a column hole opened at the other end of the adjusting frame, a compression spring sleeved on the pressure control rod, one end of the pressure control rod is contacted and transmitted with the encountered unit arc plate by setting a thick head, the compression spring is supported between the thick head of the pressure control rod and the adjusting frame, the waist of the linkage column gear is movably sleeved in the through hole opened on the adjusting frame by fixing the I-shaped cylinder, the local section on the integrated frame slides through the square hole opened on the adjusting frame, one end of the linkage column gear is meshed and connected with the outer ring cylinder gear, and the other end of the linkage column gear is inserted into the gear hole opened at the axis center of the temporary driving shaft cylinder to establish transmission.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The channel cylinder is spliced ​​together by multiple evenly arranged core blocks. The plasma arc beam passes through the inside of the channel cylinder. If there are random branches outside the plasma arc beam, the branches will be intercepted by the channel cylinder. The remaining densely gathered plasma arc beam passes through the interception cylinder and then penetrates the workpiece plate, making the edge of the cut workpiece plate smoother and neater.

[0027] 2. The plasma arc beam passes through a row of intercepting cylinders, and the row of intercepting cylinders moves axially synchronously. The intercepting cylinder at one end decomposes, and the decomposed core blocks are cooled by blowing air. The intercepting cylinder at the other end is spliced and generated. In such a row of intercepting cylinders, there are intercepting cylinders that intercept the scattered branches of the periphery of the plasma arc beam, and there are also overheated intercepting cylinders that automatically decompose to avoid continuous temperature rise. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of the present invention.

[0029] Figure 2 It is a schematic position diagram of the arc intercepting integrator.

[0030] Figure 3 It is a schematic structural diagram of the arc intercepting integrator.

[0031] Figure 4 It is a schematic position diagram of the module device.

[0032] Figure 5 It is a schematic structural diagram of the module device.

[0033] Figure 6 It is a schematic position diagram of the local module.

[0034] Figure 7 It is a schematic structural diagram of the local module.

[0035] Figure 8 It is a schematic position diagram of the inner core cooling device.

[0036] Figure 9 It is a schematic structural diagram of the core block.

[0037] Figure 10 It is a schematic structural diagram of the inner core cooling device.

[0038] Figure 11 It is a schematic structural diagram of the air duct device.

[0039] Figure 12 It is a schematic structural diagram of the speed increasing group.

[0040] Figure 13 It is a schematic structural diagram of the temporarily moving group.

[0041] Figure 14 It is a schematic position diagram of the linkage column gear.

[0042] In the figure: plasma arc gun 1, arc intercepting integrator 2, disc rack 3, external gear ring 4, module device 5, rail rack 6, inner core cooling device 7, module vertical disc 8, local module 9, unit pile column 10, worm 11, flat shaft 12, circumferential travel shaft 13, cam weight 14, channel unit component 15, direction rod 16, spring 17, T seat 18, telescopic plate 19, sliding resistance plate 20, core block 21, unit arc plate 22, cylindrical box 23, outer ring barrel gear 24, air duct device 25, linkage device 26, flat tube 27, air box 28, fan 29, driving shaft 30, integrated rack 31, speed increasing group 32, temporary driving group 33, side control shaft 34, speed increasing gear 35, temporary driving shaft cylinder 36, accelerating gear 37, pressure control rod 38, pressure spring 39, adjusting rack 40, return elastic piece 41, linkage column gear 42. Detailed implementation manners

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the technical solutions in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] Please refer to Figures 1 to 14 , the present invention provides a technical solution: a plasma cutting device for the production of expansion joints, including a plasma arc gun 1 and an arc intercepting integrator 2 for intercepting the scattered branches of the plasma arc beam emitted by the plasma arc gun 1. The arc intercepting integrator 2 includes:

[0045] A disc rack 3 fixed on the plasma arc gun 1, and the plasma arc beam emitted by the plasma arc gun 1 passes through the middle hole on the disc rack 3;

[0046] An external gear ring 4 arranged around the edge of the disc rack 3, and the external gear ring 4 is stuck in the annular groove opened on the side wall of the edge of the disc rack 3;

[0047] Driven by a plurality of uniformly arranged module devices 5 below the external gear ring 4, and a plurality of module devices 5 form a channel for the plasma arc line to pass through at the gathering place, and the scattered branches of the plasma arc beam are intercepted by the channel;

[0048] A rail rack 6 for guiding the gathering of the module devices 5, one end of the rail rack 6 is fixed on the disc rack 3, and one rail rack 6 is correspondingly distributed on one side of each module device 5;

[0049] An inner core cooling device 7 attached to the module device 5, and the inner core cooling device 7 blows air to cool the components replaced from the channel on the module device 5.

[0050] Refer to Figure 5 Understand, the module device 5 includes:

[0051] The unit pile 10 is fixed on the disk frame 3, and the worm 11 and the flat shaft 12 supported on the unit pile 10, one end of the worm 11 is meshed and connected with the outer gear ring 4 through a fixed gear, and the spiral teeth on the worm 11 are meshed and connected with the gear fixed at one end of the flat shaft 12;

[0052] The other end of the flat shaft 12 is fixed with a module stand 8 , and a plurality of local modules 9 are evenly arranged around the edge of the module stand 8 .

[0053] refer to Figure 7 It is understood that local module 9 includes:

[0054] A circular shaft 13 movably sleeved in a through hole provided on the module stand 8, and a cam weight 14 fixed at one end of the circular shaft 13;

[0055] The other end of the circumferential shaft 13 supports a channel unit element 15 .

[0056] refer to Figure 7 It is understood that the channel unit 15 includes a T-seat 18 fixedly connected to the circular shaft 13, a telescopic plate 19 that slides and telescopes in a plate groove opened on the T-seat 18, a core block 21 fixed at one end of the telescopic plate 19, a sliding resistance plate 20 vertically fixed on one side of the telescopic plate 19, a spring 17 supported between the T-seat 18 and the telescopic plate 19, and a direction rod 16 passing through the inside of the spring 17, the direction rod 16 slides through the column hole opened on the T-seat 18, and one end of the direction rod 16 is fixed on the telescopic plate 19.

[0057] The core block 21 is fan-shaped, and a plurality of evenly arranged core blocks 21 are butt-jointed to form a channel cylinder for intercepting the peripheral random branches of the plasma arc beam, and the remaining concentrated plasma arc passes through the inside of the channel cylinder and penetrates the workpiece plate. The rail frame 6 includes a column and an L-shaped baffle fixed on one side of the column. The sliding resistance plate 20 moving around is blocked by the column of the rail frame 6, and the sliding resistance plate 20 rises along the channel between the column of the rail frame 6 and the L-shaped baffle, and the channel cylinder formed by the butt joint of the core blocks 21 is controlled by the telescopic plate 19 to move axially.

[0058] refer to Figure 9, the plasma arc beam passes through the middle of a row of channel cylinders. If there are scattered branches on the plasma arc beam, they will be intercepted by the channel cylinders, and the remaining concentrated plasma arc beam will be emitted straight, and then penetrate the workpiece plate, making the cut edge of the workpiece plate neat. The temperature of the channel cylinder rises. To prevent irreversible impact damage caused by overheating of the channel cylinder, the channel cylinder at the plasma arc beam emission position is replaced periodically. In this way, the channel cylinder with increased temperature leaves the plasma arc beam emission. Specifically, the cylinder formed by four core blocks 21 rises straight, automatically separates after reaching the top, and the separated core blocks 21 move along a C-shaped route, and will move to the position where cold air is sprayed. The cold air blows onto the inner wall of the channel of the core block 21 to quickly cool the core block 21. After cooling, the core block 21 continues to move, and finally the multiple core blocks 21 arranged in a ring are re-assembled into a channel cylinder. In this way, the channel cylinder at the plasma arc beam emission position always exists, and there are always departures and replenishments. In this way, the interception work of the scattered branches of the plasma arc beam and the replacement work of the channel cylinder do not affect each other.

[0059] The core block 21 moves along a C-shaped route because the external gear ring 4 is externally connected to a driving mechanism in the prior art. The external gear ring 4 rotates to drive all the worm gears 11 to rotate, and then drives the module vertical disk 8 to rotate through the flat shaft 12, causing the circumferential axis 13 to move in a circular motion. Under the action of the gravity of the cam weight 14, the T seat 18 always remains horizontal. In this way, the telescopic plate 19 drives the core block 21, and the core block 21 moves horizontally along a C-shaped route. Figure 9 The core block 21 that forms the channel cylinder rises because the sliding resistance plate 20 in circular motion is intercepted, clamped and guided by the rail frame 6, and then the sliding resistance plate 20 rises straight, correspondingly controlling the channel cylinder to rise straight.

[0060] Reference Figure 10 Understand that the inner core cooling device 7 includes an outer ring gear 24 fixed in the middle of the module vertical disk 8, a plurality of unit arc plates 22 evenly arranged around the outside of the outer ring gear 24, a cylindrical box 23 that blows air onto the inner wall of the channel on the core block 21, an air duct device 25 that supplies air to the cylindrical box 23, and a linkage device 26 that establishes transmission between the outer ring gear 24 and the air duct device 25. The unit arc plates 22 are fixed on the module vertical disk 8, and a plurality of air holes are opened on the side shell of the cylindrical box 23 facing the core block 21.

[0061] The air duct device 25 includes a flat tube 27 fixedly connected to one end of the cylindrical box 23, a wind box 28 fixedly connected to the other end of the flat tube 27, a fan 29 arranged in the wind box 28, and a driving shaft 30 fixed in the middle of the fan 29. The driving shaft 30 is movably sleeved in a through hole opened in the middle of the bottom plate at one end of the wind box 28. The other end of the wind box 28 is fixedly connected to a hard pipe, and the hard pipe is fixed on the unit pile 10.

[0062] The linkage device 26 includes an integrated frame 31 with one end fixed to the wind box 28, a temporary drive group 33 supported by the other end of the integrated frame 31, and a speed increasing group 32 that establishes transmission between the driving shaft 30 and the temporary drive group 33.

[0063] The speed increasing group 32 includes a temporary shaft cylinder 36 movably sleeved in a through hole provided on the integrated frame 31, a speed increasing gear 35 with a fixed sleeve at one end of the temporary shaft cylinder 36, a side control shaft 34 also movably sleeved in a column hole provided on the integrated frame 31, and an acceleration gear 37 fixed on the side control shaft 34. The end of the driving shaft 30 is meshed and connected with the acceleration gear 37 through a fixed gear, and the side control shaft 34 is meshed and connected with the speed increasing gear 35 through a fixed cylinder gear.

[0064] The temporary motion group 33 includes an adjustment frame 40, a linkage column gear 42 supported by one end of the adjustment frame 40, a return spring 41 connected between the adjustment frame 40 and the integrated frame 31, a pressure control rod 38 sliding through the column hole opened at the other end of the adjustment frame 40, a compression spring 39 sleeved on the pressure control rod 38, one end of the pressure control rod 38 is provided with a rough head to contact and drive with the unit arc plate 22 encountered, the compression spring 39 is supported between the rough head of the pressure control rod 38 and the adjustment frame 40, the waist of the linkage column gear 42 is movably sleeved in the through hole opened on the adjustment frame 40 by fixing the I-shaped cylinder, and the local on the integrated frame 31 The segment slides through the square hole opened on the adjustment frame 40, one end of the linkage column gear 42 is meshed with the outer ring cylinder gear 24 for transmission connection, and the other end of the linkage column gear 42 is inserted into the gear hole opened at the axis of the temporary shaft cylinder 36 to establish transmission. The compression spring 39 is designed to avoid the tooth rigidity collision problem during the insertion of the linkage column gear 42 into the temporary shaft cylinder 36. Once the arc plate 22 of the surrounding motion unit lifts the pressure control rod 38, the pressure control rod 38 pushes the adjustment frame 40 through the compression spring 39, and the adjustment frame 40 drives the linkage column gear 42, and the linkage column gear 42 is smoothly and flexibly inserted into the temporary shaft cylinder 36.

[0065] The core block 21 moves around to the position of the cylindrical box 23, and cold air is sprayed out of the cylindrical box 23 to cool the inner wall of the channel on the core block 21. After the core block 21 and the cylindrical box 23 are separated, the cold air automatically stops spraying, thus avoiding waste of cold air.

[0066] Gas transmission principle: The rotation of the module vertical disk 8 drives the outer ring cylinder gear 24, and then drives the adjacent moving shaft cylinder 36 through the linkage column gear 42. Next, it drives the side control shaft 34 through the speed increasing gear 35, and further accelerates the rotation of the gear 37 to drive the driving shaft 30. The corresponding fan 29 rotates continuously to achieve ventilation. The rigid pipe connected to the air box 28 is externally connected to the cold air supply mechanism in the prior art. The rotation of the fan 29 conveys cold air. The cold air flows through the air box 28, the flat pipe 27 and the cylindrical box 23, and then is ejected and sprayed on the core block 21. The process of cold air spraying is intermittent. When cold air is sprayed, the unit arc plate 22 contacts the pressure control rod 38, and the core block 21 moves away from the cylindrical box 23. The corresponding unit arc plate 22 and the pressure control rod 38 that move in a circular motion are separated. In this way, the return spring piece 41 pushes to move the adjustment frame 40. The adjustment frame 40 drives the linkage column gear 42. The axially moving linkage column gear 42 is separated from the adjacent moving shaft cylinder 36, the driving path of the fan 29 rotation is disconnected, the fan 29 stops rotating, and the cold air stops being conveyed.

[0067] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A plasma cutting device for manufacturing expansion joints, comprising a plasma arc gun and an arc intercepting integrator for intercepting the scattered branches outside the plasma arc beam emitted by the plasma arc gun, characterized in that: The arc intercepting integrator comprises: A disc frame fixed on the plasma arc gun, wherein the plasma arc beam emitted by the plasma arc gun passes through a middle hole on the disc frame; An outer gear ring is arranged at the edge of the disc frame, and the outer gear ring is clamped in a ring groove provided on the side wall of the disc frame edge; A plurality of module devices evenly arranged in a ring are driven under the outer gear ring, and the plurality of module devices form a channel for the plasma arc to pass through at the convergence point, and the peripheral random branches of the plasma arc beam are intercepted by the channel; A rail frame used to guide the module devices to gather together, one end of the rail frame is fixed on the disk frame, and one side of each module device is correspondingly distributed with a rail frame; The module device is provided with an inner core cooling device, which blows air to cool down the components replaced from the channel on the module device; The module device comprises: The unit piles are fixed on the disc frame, and the worm and the flat shaft are supported on the unit piles, one end of the worm is meshed and connected with the outer gear ring through a fixed gear, and the spiral teeth on the worm are meshed and connected with the gear fixed at one end of the flat shaft; A module stand plate fixed at the other end of the horizontal axis, and a plurality of local modules evenly arranged around the edge of the module stand plate; The local module includes: A circular shaft movably sleeved in a through hole provided on the module vertical plate, and a cam weight block fixed at one end of the circular shaft; A channel unit element supported at the other end of the traveling shaft; The channel unit element includes a T-seat fixedly connected to the traveling shaft, a telescopic plate that slides and telescopes in a plate groove provided on the T-seat, a core block fixed at one end of the telescopic plate, a sliding resistance plate vertically fixed at one side of the telescopic plate, a spring supported between the T-seat and the telescopic plate, and a direction rod passing through the inside of the spring, the direction rod slides through a column hole provided on the T-seat, and one end of the direction rod is fixed on the telescopic plate; The core block is in the shape of a fan-shaped block. A plurality of evenly arranged core blocks are butt-jointed to form a channel cylinder for intercepting peripheral random branches of a plasma arc beam, and the remaining concentrated plasma arc passes through the inside of the channel cylinder and penetrates the workpiece plate. The rail frame includes a column and an L-shaped baffle fixed on one side of the column. The sliding resistance plate that moves around is blocked by the rail frame column, and the sliding resistance plate rises along the channel between the rail frame column and the L-shaped baffle, and the channel cylinder formed by butt-jointing the core blocks is controlled by the telescopic plate to move axially.

2. The plasma cutting device for manufacturing expansion joints according to claim 1, wherein: The inner core cooling device includes an outer ring cylinder gear fixed on the middle of the module vertical plate, a plurality of unit arc plates evenly arranged outside the outer ring cylinder gear, a cylindrical box for blowing air to the inner wall of the channel on the core block, an airway device for supplying air to the cylindrical box, and a linkage device for establishing a transmission between the outer ring cylinder gear and the airway device. The unit arc plate is fixed on the module vertical plate, and a plurality of air holes are provided on the shell of the cylindrical box facing the core block.

3. The plasma cutting device for manufacturing expansion joints according to claim 2, wherein: The airway device includes a flat tube with one end fixedly connected to the cylindrical box, a wind box fixedly connected to the other end of the flat tube, a fan arranged in the wind box, and an actuating shaft fixed in the middle of the fan, the actuating shaft is movably sleeved in a through hole opened in the middle of the bottom plate at one end of the wind box, the other end of the wind box is fixedly connected to a hard pipe, and the hard pipe is fixed on the unit pile column.

4. The plasma cutting device for manufacturing expansion joints according to claim 3, wherein: The linkage device comprises an integrated frame with one end fixed on the wind box, a temporary driving group supported by the other end of the integrated frame, and a speed increasing group for establishing transmission between the driving shaft and the temporary driving group.

5. The plasma cutting device for manufacturing an expansion joint according to claim 4, wherein: The speed increasing group includes a driving shaft cylinder movably sleeved in a through hole provided on the integrated frame, a speed increasing gear fixedly sleeved at one end of the driving shaft cylinder, a side control shaft also movably sleeved in a column hole provided on the integrated frame, and an acceleration gear fixedly sleeved on the side control shaft. The end of the driving shaft is meshed and connected to the acceleration gear through a fixed gear, and the side control shaft is meshed and connected to the speed increasing gear through a fixed cylinder gear.

6. The plasma cutting equipment for manufacturing expansion joints according to claim 5, characterized in that: The temporary driving group includes an adjusting frame, a linkage column gear supported at one end of the adjusting frame, a return spring connected between the adjusting frame and the integrated frame, a pressure control rod sliding through a column hole opened at the other end of the adjusting frame, a compression spring sleeved on the pressure control rod, one end of the pressure control rod is contacted and transmitted with the encountered unit arc plate by setting a thick head, the compression spring is supported between the thick head of the pressure control rod and the adjusting frame, the waist of the linkage column gear is movably sleeved in the through hole opened on the adjusting frame by fixing the I-shaped cylinder, the local section on the integrated frame slides through the square hole opened on the adjusting frame, one end of the linkage column gear is meshed and connected with the outer ring cylinder gear, and the other end of the linkage column gear is inserted into the gear hole opened at the axis center of the temporary driving shaft cylinder to establish transmission.

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