A precision cutting device and deformation-resistant cutting method for thin-walled pipe fittings

Abstract

This invention discloses a precision cutting device and anti-deformation cutting method for thin-walled pipe fittings, relating to the field of thin-walled pipe fitting production technology. It includes a machine base with a fixed frame mounted on it. Auxiliary support components are installed on the upper surface of the machine base and the upper end of the fixed frame. The auxiliary support components use rolling clamps to hold the thin-walled pipe fittings. A lifting drive frame is fixed to the rear side of the machine base, and a cutting blade is vertically mounted on the lifting drive frame. This invention, through the arrangement of a main shaft, a fixed support sleeve, and an adjusting support sleeve, and in conjunction with a pull-out assembly and auxiliary support components, provides close support to the cutting point of the thin-walled pipe fitting, preventing inward deformation during cutting. Furthermore, the operator can adjust the distance between the fixed and adjusting support sleeves according to the wall thickness of the thin-walled pipe fitting to achieve optimal support at the cutting point, ensuring a high yield of finished thin-walled pipe fittings after cutting.

Description

Technical Field

[0001] This invention relates to the field of thin-walled pipe manufacturing technology, and in particular to a precision cutting device and a deformation-resistant cutting method for thin-walled pipes. Background Technology

[0002] Thin-walled tubes are made by piercing steel ingots or solid tube blanks to form rough tubes, which are then hot-rolled, cold-rolled, or cold-drawn. Thin-walled tubes hold an important position in my country's steel pipe industry. The raw material for thin-walled tubes is round tube blanks, which are cut into billets of about 1 meter in length by a cutting machine and then conveyed to a furnace for heating.

[0003] During the elongation process of thin-walled pipes, it is usually necessary to cut the thin-walled pipes to obtain finished thin-walled pipes of a predetermined length. When cutting thin-walled pipes, special attention should be paid to the deformation of the pipe ends, that is, the deformation of the thin-walled pipes at the cut. There are various cutting devices in the prior art that can reduce the deformation of thin-walled pipes.

[0004] For example, a pipe production anti-deformation cutting device disclosed in patent document CN111660358B includes a slide, the inner side of which is connected to a fixed sleeve via a pneumatic telescopic rod. There are two sets of fixed sleeves, each set including two semi-circular sleeves with their ends fitting together. The interior of each semi-circular sleeve is hollow, and the concave surface on the outer side of the semi-circular sleeve is provided with several through holes. A sealing gasket is fixedly connected to the concave surface on the outer side of the semi-circular sleeve. A fixed cylinder is fixedly connected to the top of the slide, and the fixed cylinder is driven by the pneumatic telescopic rod through an air passage. The pneumatic telescopic rod is connected to a pressure regulating mechanism through a hose. A knife holder is provided on the inner side of the slide and slidably connected thereto.

[0005] For example, the patent document with publication number "CN113618146B" discloses a thin-walled steel pipe anti-deformation cutting device, which includes a support plate and a motor. The motor is fixedly installed on the side of the support plate, and a power mechanism is fixedly installed on the side of the support plate. A rotating mechanism is sleeved on the outer surface of the power mechanism, and a support sleeve is sleeved on the outer surface of the rotating mechanism. The support sleeve is fixedly connected to the support plate, and a cutting mechanism is threadedly connected to the front end of the rotating mechanism.

[0006] Based on the above search and combined with existing technology, it was found that existing precision cutting devices for thin-walled pipes all have certain defects in use. For example, the patent document with publication number "CN111660358B" discloses a solution that reduces the external pressure during cutting by changing the air pressure inside the pipe. However, this pressure becomes uncontrollable as the cutting progresses, and the pressure is unreliable when vibration occurs during cutting. Therefore, the anti-deformation effect is not ideal. Another example is the patent document with publication number "CN113618146B," which discloses a solution of internal cutting and external clamping by a hoop. However, the gap between the hoops is large and difficult to adjust, which cannot provide good limiting support for the part of the pipe being cut, making its anti-deformation effect not ideal. Therefore, there is a need for a precision cutting device for thin-walled pipes and an anti-deformation cutting method. Summary of the Invention

[0007] The purpose of this application is to provide a precision cutting device and a deformation-resistant cutting method for thin-walled pipes to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this application provides the following technical solution: a precision cutting device for thin-walled pipes, including a base, a fixed frame mounted on the base, auxiliary support members mounted on the upper surface of the base and the upper end of the fixed frame, the auxiliary support members using a rolling clamp to hold the thin-walled pipes, a lifting drive frame fixed to the rear side of the base, a cutting blade vertically mounted on the lifting drive frame, a servo motor for driving the cutting blade to rotate mounted on one side of the cutting blade, and a side plate fixed to one end of the base;

[0009] A main shaft is rotatably connected to the side plate, and the other end of the main shaft extends toward the other end of the equipment base.

[0010] A fixed support sleeve is fixedly sleeved on the main shaft, and an adjustable support sleeve is also adjustable on the main shaft. The adjustable support sleeve can be adjusted horizontally along the axis of the main shaft. The fixed support sleeve and the adjustable support sleeve are symmetrically arranged about the cutting surface of the cutting blade, and there is a gap between the side wall of the fixed support sleeve and the side wall of the cutting blade on the side that is close to each other.

[0011] A drive motor for driving the spindle to rotate is installed at the end of the side plate of the equipment base away from the spindle;

[0012] Among them, the upper surface of the equipment base is also equipped with a tie assembly. The tie assembly and the fixed support sleeve cooperate to roll and pull the thin-walled tube from one end of the thin-walled tube, and with the help of multiple auxiliary support components, the thin-walled tube remains stable before and after cutting.

[0013] Positioning sensors are fixedly embedded in the side walls of the fixed support sleeve and the adjusting support sleeve at their respective ends. The positioning sensors are used to sense the cutting depth of the cutting blade and control the lifting drive frame to stop when the cutting edge of the cutting blade coincides with the detection range of the positioning sensor, so that the cutting blade stops descending.

[0014] As a further supplement to this solution, one end of the main shaft is connected to the output shaft of the drive motor, and the end of the main shaft away from the drive motor is provided with a reduced diameter section with a diameter smaller than the inner diameter of the adjusting support sleeve. A sliding groove is provided on the main shaft, the extension direction of the sliding groove is parallel to the axis of the main shaft, and the end opening of the sliding groove is located at the end of the reduced diameter section.

[0015] The spindle also has a threaded section on the circumference of the reduced diameter section; the slide groove passes through the threaded section laterally;

[0016] The inner side of the adjusting support sleeve is fixed with a sliding rib that slides with the sliding groove, and an adjusting ring is rotatably connected to one side of the adjusting support sleeve. The adjusting ring is threaded and adapted to the threaded part.

[0017] As a further supplement to this solution, a connecting hole extending radially along the spindle is provided at one end of the reduced diameter section near the threaded section.

[0018] A limiting ring is movably sleeved on the reduced diameter section of the spindle. One side of the limiting ring abuts against the side wall of the reduced diameter section near the threaded part. A fastening bolt that is threaded into the connecting hole is provided through the limiting ring. The nut of the fastening bolt abuts against the bottom wall of the stepped hole of the limiting ring.

[0019] As a further supplement to this solution, a cooling chamber is provided inside the spindle. The length of the cooling chamber covers the gap between the fixed support sleeve and the adjusting support sleeve. A cooling channel is provided on one side of the cooling chamber. The cooling channel extends towards the side of the spindle away from the drive motor. A rotary joint communicating with the cooling channel is rotatably connected to the end of the spindle away from the drive motor.

[0020] A circulating pump is fixed on the side plate of the equipment base. The circulating pump is connected to the rotary joint through a circulating pipe. When the circulating pump is started, it circulates coolant into the rotary joint through the circulating pipe.

[0021] As a further supplement to this solution, the cooling channel includes an inlet channel and an outlet channel. The inlet channel is coaxial with the spindle, and the outlet channel is parallel to the axis of the spindle.

[0022] The rotary joint includes an inlet connector that communicates with the inlet channel and an outlet connector that communicates with the outlet channel.

[0023] Among them, the water inlet channel and the water outlet channel, as well as the water inlet connector and the water outlet connector, are not connected to each other;

[0024] In addition, there are two circulation pipes, which are fixed and connected to the inlet and outlet connectors respectively. The circulation pipe connected to the inlet connector is connected to the output end of the circulation pump, and the circulation pipe connected to the outlet connector is connected to the input end of the circulation pump.

[0025] As a further supplement to this solution, the pull assembly includes a fixed frame, a tension spring, a slider, and a pressure rod;

[0026] The fixed frame is fixed to the upper surface of the equipment base, the slider is slidably embedded in the fixed frame, the upper and lower ends of the tension spring are fixed to the bottom surface of the slider and the bottom wall of the fixed frame respectively, and the pressure rod is rotatably connected to one side of the slider through a rotating shaft;

[0027] The end of the pressure rod away from the side plate of the equipment base is shaped like a frustum.

[0028] As a further supplement to this solution, the auxiliary support components include a fixed base, a sliding base, support wheels, and a compression spring;

[0029] The auxiliary support installed on the equipment base is set upwards. The lower end of the fixed seat is fixed to the upper end surface of the equipment base. The lower end of the sliding seat is elastically slidably connected to the fixed seat through a compression spring. The support wheel is rotatably connected to the upper end of the sliding seat. The axis of the support wheel is parallel to the axis of the main shaft.

[0030] The auxiliary support components installed on the fixed frame are positioned downwards.

[0031] As a further supplement to this solution, the rotation direction of the cutting blade is opposite to that of the spindle, and there is a speed difference between the cutting blade and the spindle.

[0032] This application also discloses a method for preventing deformation during cutting of thin-walled pipe fittings, applied in a precision cutting device for thin-walled pipe fittings as described above, comprising the following steps:

[0033] S1. Insert the thin-walled tube into the main shaft from the end away from the drive motor, and press down the inner wall of the thin-walled tube end by the pull-down assembly, so that the thin-walled tube is clamped by the fixed support sleeve, the adjusting support sleeve and the pull-down assembly. At the same time, multiple sets of auxiliary support components assist in clamping the thin-walled tube along the outer wall of the thin-walled tube.

[0034] S2. Turn on the drive motor, the lifting drive frame, and the servo motor that drives the cutting blade to rotate, so that the cutting blade rotates and moves down, and at the same time, the spindle drives the thin-walled tube to rotate through the fixed support sleeve and the adjusting support sleeve, thereby cutting the thin-walled tube.

[0035] S3. When the cutting blade cuts through the thin-walled pipe and falls between the two positioning sensors of the fixed support sleeve and the adjusting support sleeve, the lifting drive frame stops descending, so that the cutting blade stays at that position to continue cutting.

[0036] S4. Cutting is completed after the thin-walled tube has rotated one revolution.

[0037] As a further supplement to this method, in S2, the rotation direction of the cutting blade is opposite to the rotation direction of the thin-walled tube, and there is a speed difference between the cutting blade and the thin-walled tube;

[0038] In S2, the fixed support sleeve and the adjusting support sleeve can provide support for the cutting part of the thin-walled pipe to fit the cutting point, so that the thin-walled pipe will not undergo concave deformation during cutting.

[0039] In addition, before performing S1, the staff can adjust the distance between the fixed support and the adjusting support according to the wall thickness of the thin-walled pipe fitting to achieve the best support effect at the cutting point of the thin-walled pipe fitting.

[0040] In summary, the technical effects and advantages of this invention are as follows:

[0041] 1. In this invention, by setting up a main shaft, a fixed support sleeve, and an adjustable support sleeve, and using them in conjunction with a pull-out assembly and auxiliary support components, the fixed support sleeve and the adjustable support sleeve can provide close support to the cutting point of the thin-walled pipe, so that the thin-walled pipe will not undergo inward deformation during cutting. In addition, the operator can adjust the distance between the fixed support sleeve and the adjustable support sleeve according to the wall thickness of the thin-walled pipe to achieve the best support effect at the cutting point of the thin-walled pipe, ensuring the finished product qualification rate of the thin-walled pipe after cutting.

[0042] 2. In this invention, by circulating coolant into the cooling chamber, the spindle and the ends of the corresponding fixed support sleeve and adjusting support sleeve that are close to each other are cooled, thereby cooling the cutting point of the thin-walled tube and avoiding phase change caused by excessive temperature at the cutting part of the thin-walled tube during cutting, and ultimately further improving the effect of preventing deformation of the end of the thin-walled tube. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the three-dimensional structure in this embodiment;

[0045] Figure 2 This is a cross-sectional structural diagram of the main shaft, fixed support sleeve, and adjusting support sleeve in this embodiment;

[0046] Figure 3 for Figure 2Enlarged view of the structure at point A in the middle;

[0047] Figure 4 This is a schematic diagram of a partial structure of the spindle in this embodiment;

[0048] Figure 5 This is a schematic diagram of the disassembled structure of the fixed support sleeve and the adjustable support sleeve in this embodiment;

[0049] Figure 6 This is a schematic diagram of the tie rod assembly and auxiliary support structure in this embodiment;

[0050] Figure 7 This is a side view of the structure when cutting thin-walled pipes in this embodiment.

[0051] In the diagram: 1. Equipment base; 11. Auxiliary support; 111. Fixed seat; 112. Sliding seat; 113. Support wheel; 114. Compression spring; 12. Fixed frame; 2. Lifting drive frame; 3. Cutting blade; 4. Main shaft; 41. Cooling chamber; 42. Cooling channel; 421. Water inlet channel; 422. Water outlet channel; 43. Limiting ring; 431. Fastening bolt; 44. Slide groove; 45. Threaded part; 46. Connecting hole; 47. Rotary joint; 471. Water inlet connector; 472. Water outlet connector; 5. Drive motor; 6. Circulating pump; 61. Circulating pipe; 7. Fixed support sleeve; 8. Adjusting support sleeve; 81. Adjusting ring; 82. Sliding rib; 9. Pull-out assembly; 91. Fixed frame; 92. Tension spring; 93. Slider; 94. Downward pressure rod; 10. Positioning sensor. Detailed Implementation

[0052] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] Example:

[0054] refer to Figures 1-7 The thin-walled pipe precision cutting device shown includes a device base 1, a fixed frame 12 mounted on the device base 1, auxiliary support members 11 mounted on the upper surface of the device base 1 and the upper end of the fixed frame 12, the auxiliary support members 11 use rolling clamps to hold the thin-walled pipe, a lifting drive frame 2 fixed on the rear side of the device base 1, a cutting blade 3 vertically lifted and lowered on the lifting drive frame 2, a servo motor for driving the cutting blade 3 to rotate is also mounted on one side of the cutting blade 3, and a side plate is also fixed at one end of the device base 1;

[0055] A main shaft 4 is rotatably connected to the side plate, and the other end of the main shaft 4 extends toward the other end of the equipment base 1.

[0056] A fixed support sleeve 7 is fixedly sleeved on the main shaft 4, and an adjustable support sleeve 8 is also adjustablely sleeved on the main shaft 4. The adjustable support sleeve 8 can be adjusted horizontally along the axis of the main shaft 4. The fixed support sleeve 7 and the adjustable support sleeve 8 are symmetrically arranged about the cutting surface of the cutting blade 3, and there is a gap between the side wall of the fixed support sleeve 7 and the side wall of the adjustable support sleeve 8 that are close to each other and the side wall of the cutting blade 3.

[0057] A drive motor 5 for driving the spindle 4 to rotate is installed at the end of the side plate of the equipment base 1 away from the spindle 4;

[0058] Among them, the upper surface of the equipment base 1 is also equipped with a tie assembly 9. The tie assembly 9 cooperates with the fixed support sleeve 7 to roll and pull the thin-walled pipe (such as a thin-walled stainless steel pipe) from one end, and cooperates with multiple auxiliary support components 11 to keep the thin-walled pipe stable before and after cutting.

[0059] Positioning sensors 10 are fixedly embedded in the side walls of the fixed support sleeve 7 and the adjusting support sleeve 8 at their respective ends. The positioning sensors 10 are used to sense the cutting depth of the cutting blade 3, and control the lifting drive frame 2 to stop when the cutting edge of the cutting blade 3 coincides with the detection range of the positioning sensor 10, so that the cutting blade 3 stops descending.

[0060] Based on the above structure, when it is necessary to cut thin-walled pipes, the operator first puts the thin-walled pipe onto the main shaft 4 from the end away from the drive motor 5, and the inner wall of the thin-walled pipe end is pressed down by the pull assembly 9, so that the thin-walled pipe is clamped by the fixed support sleeve 7, the adjusting support sleeve 8 and the pull assembly 9. At the same time, multiple sets of auxiliary support parts 11 assist in clamping the thin-walled pipe along the outer wall of the thin-walled pipe. Then, the drive motor 5, the lifting drive frame 2 and the servo motor that drives the cutting blade 3 to rotate are turned on, so that the cutting blade 3 rotates and moves down, and at the same time, the main shaft 4 drives the thin-walled pipe to rotate through the fixed support sleeve 7 and the adjusting support sleeve 8, thereby cutting the thin-walled pipe. When the cutting edge of the cutting blade 3 cuts through the thin-walled pipe and falls between the two positioning sensors 10 of the fixed support sleeve 7 and the adjusting support sleeve 8, the lifting drive frame 2 stops descending, so that the cutting blade 3 stays at this position and continues to cut until the thin-walled pipe rotates one revolution and the cutting is completed.

[0061] Because the fixed support sleeve 7 and the adjustable support sleeve 8 can provide close support to the cutting point of the thin-walled pipe fitting, the thin-walled pipe fitting will not undergo inward deformation during cutting. In addition, the staff can adjust the distance between the fixed support sleeve 7 and the adjustable support sleeve 8 according to the wall thickness of the thin-walled pipe fitting to achieve the best support effect at the cutting point of the thin-walled pipe fitting, and ensure the finished product qualification rate of the thin-walled pipe fitting after cutting.

[0062] It should be noted that, in order to meet the precise cutting requirements of the cutting blade 3 and to change the cutting position by adjusting the distance between the fixed support sleeve 7 and the adjusting support sleeve 8, those skilled in the art can also set a sliding track (not shown in the figure) that moves along the axis of the main shaft 4 on the lifting drive frame 2 according to actual usage requirements, thereby adjusting the position of the cutting blade 3 so that the cutting blade 3 can always be in the middle between the fixed support sleeve 7 and the adjusting support sleeve 8 for precise cutting operations.

[0063] Furthermore, one end of the main shaft 4 is connected to the output shaft of the drive motor 5 for transmission. The end of the main shaft 4 away from the drive motor 5 is provided with a reduced diameter section with a diameter smaller than the inner diameter of the adjusting support sleeve 8. A slide groove 44 is provided on the main shaft 4. The extension direction of the slide groove 44 is parallel to the axis of the main shaft 4, and the end opening of the slide groove 44 is located at the end of the reduced diameter section.

[0064] The main shaft 4 is provided with a threaded part 45 on the circumference of the reduced diameter section; the slide groove 44 passes through the threaded part 45 laterally.

[0065] The inner side of the adjusting support sleeve 8 is fixed with a sliding rib 82 that slides with the sliding groove 44. An adjusting ring 81 is rotatably connected to one side of the adjusting support sleeve 8. The adjusting ring 81 is threadedly matched with the threaded part 45.

[0066] When the position of the adjusting support sleeve 8 needs to be adjusted, the operator only needs to rotate the adjusting ring 81, so that the adjusting ring 81 interacts with the threaded part 45, thereby causing the adjusting ring 81 to move horizontally along the axis of the main shaft 4, which in turn drives the adjusting support sleeve 8 to move horizontally. The adjusting support sleeve 8 also slides with the sliding groove 44 through the sliding rib 82. Therefore, after the position of the adjusting support sleeve 8 is adjusted, the adjusting support sleeve 8 is still affected by the rotation of the main shaft 4 and rotates, ensuring the transmission effect between the two. By adjusting the adjusting support sleeve 8, the gap between the fixed support sleeve 7 and the adjusting support sleeve 8 can be changed, so as to provide good inner wall support for thin-walled pipes of different wall thicknesses and prevent the thin-walled pipes from deforming during the cutting process.

[0067] Furthermore, a connecting hole 46 extending radially along the main shaft 4 is provided at one end of the reduced diameter portion of the main shaft 4 near the threaded portion 45.

[0068] A limiting ring 43 is movably sleeved on the reduced diameter section of the main shaft 4. One side of the limiting ring 43 abuts against the side wall of the reduced diameter section near the threaded section 45. A fastening bolt 431 is threadedly connected to the connecting hole 46 through the limiting ring 43. The nut of the fastening bolt 431 abuts against the bottom wall of the stepped hole of the limiting ring 43.

[0069] By setting the limiting ring 43, the adjusting ring 81 can be limited when it is turned to the outermost end of the threaded part 45, so as to avoid the adjusting ring 81 being turned too much, which would cause the thread self-locking effect between it and the threaded part 45 to deteriorate, thereby causing the adjusting ring 81 to disengage and the adjusting support sleeve 8 to lose its limit, thus preventing the adjusting support sleeve 8 from losing its effective support for the thin-walled pipe.

[0070] Furthermore, a cooling chamber 41 is provided inside the main shaft 4. The length of the cooling chamber 41 covers the gap between the fixed support sleeve 7 and the adjusting support sleeve 8. A cooling channel 42 is provided on one side of the cooling chamber 41. The cooling channel 42 extends towards the side of the main shaft 4 away from the drive motor 5. A rotary joint 47 communicating with the cooling channel 42 is rotatably connected to the end of the main shaft 4 away from the drive motor 5.

[0071] A circulation pump 6 is fixed on the side plate of the equipment base 1. The circulation pump 6 is connected to the rotary joint 47 through the circulation pipe 61. When the circulation pump 6 is started, it circulates coolant into the rotary joint 47 through the circulation pipe 61.

[0072] By circulating coolant (such as water) into the cooling chamber 41, the spindle 4 and the corresponding fixed support sleeve 7 and adjusting support sleeve 8 that are close to each other are cooled. This can cool the cutting point of the thin-walled tube and prevent phase change caused by excessive temperature at the cutting part of the thin-walled tube during cutting. Ultimately, this further improves the effect of preventing deformation of the end of the thin-walled tube.

[0073] Furthermore, the cooling channel 42 includes a water inlet channel 421 and a water outlet channel 422. The water inlet channel 421 is coaxially arranged with the main shaft 4, and the water outlet channel 422 is parallel to the axis of the main shaft 4.

[0074] The rotary joint 47 includes an inlet joint 471 that communicates with the inlet channel 421 and an outlet joint 472 that communicates with the outlet channel 422.

[0075] Among them, the water inlet channel 421 and the water outlet channel 422, and the water inlet connector 471 and the water outlet connector 472 are not connected to each other;

[0076] In addition, two circulation pipes 61 are provided and fixed and connected to the inlet connector 471 and the outlet connector 472 respectively. The circulation pipe 61 connected to the inlet connector 471 is connected to the output end of the circulation pump 6, and the circulation pipe 61 connected to the outlet connector 472 is connected to the input end of the circulation pump 6, thereby realizing the purpose of circulating and injecting coolant into the cooling chamber 41.

[0077] Furthermore, the pull assembly 9 includes a fixed frame 91, a tension spring 92, a slider 93, and a pressure rod 94;

[0078] The fixed frame 91 is fixed to the upper surface of the equipment base 1. The slider 93 is slidably embedded in the fixed frame 91. The upper and lower ends of the tension spring 92 are fixed to the bottom surface of the slider 93 and the bottom wall of the fixed frame 91, respectively. The pressure rod 94 is rotatably connected to one side of the slider 93 through a rotating shaft.

[0079] Among them, the end of the pressure rod 94 away from the side plate of the equipment base 1 is formed into a frustum shape.

[0080] When the end of the thin-walled pipe extends to the end of the lower pressure rod 94, the operator can manually raise the lower pressure rod 94 or the slider 93 to make the lower pressure rod 94 rise and be located inside the thin-walled pipe. When the thin-walled pipe goes deeper, the lower pressure rod 94 can be released, so that the lower pressure rod 94 descends under the elastic force of the tension spring 92 and fits against the inner wall of the thin-walled pipe. This allows the lower pressure rod 94 to work with the fixed support sleeve 7 and the adjusting support sleeve 8 to support the inside of the thin-walled pipe, thereby ensuring the stable clamping of the end of the thin-walled pipe.

[0081] Furthermore, the auxiliary support 11 includes a fixed base 111, a sliding base 112, a support wheel 113, and a compression spring 114;

[0082] The auxiliary support 11 installed on the equipment base 1 is set upward. The lower end of the fixed seat 111 is fixed to the upper end surface of the equipment base 1. The lower end of the sliding seat 112 is elastically slidably connected to the fixed seat 111 through the compression spring 114. The support wheel 113 is rotatably connected to the upper end of the sliding seat 112. The axial direction of the support wheel 113 is parallel to the axial direction of the main shaft 4.

[0083] The auxiliary support 11 installed on the fixed frame 12 is positioned downwards.

[0084] Multiple support wheels 113 are arranged around the periphery of the thin-walled pipe and roll against the outer wall of the thin-walled pipe. At the same time, under the elastic force of the compression spring 114, they can flexibly clamp the thin-walled pipe and play an auxiliary support role, so that the two sections of thin-walled pipe after cutting have stable support and avoid the thin-walled pipe from shifting during cutting.

[0085] It should be noted that the rotation direction of the cutting blade 3 is opposite to that of the spindle 4, and there is a speed difference between the cutting blade 3 and the spindle 4, which allows the thin-walled pipe to rotate in the opposite direction to the cutting blade 3, thus facilitating circumferential cutting of the thin-walled pipe.

[0086] A method for preventing deformation during cutting of thin-walled pipe fittings, applied in the aforementioned precision cutting device for thin-walled pipe fittings, includes the following steps:

[0087] S1. The thin-walled tube is inserted into the main shaft 4 from the end away from the drive motor 5, and the inner wall of the end of the thin-walled tube is pressed down by the pull assembly 9, so that the thin-walled tube is clamped by the fixed support sleeve 7, the adjusting support sleeve 8 and the pull assembly 9. At the same time, multiple sets of auxiliary support parts 11 assist in clamping the thin-walled tube along the outer wall of the thin-walled tube.

[0088] S2. Turn on the drive motor 5, the lifting drive frame 2, and the servo motor that drives the cutting blade 3 to rotate, so that the cutting blade 3 rotates and moves down, and at the same time, the main shaft 4 drives the thin-walled tube to rotate through the fixed support sleeve 7 and the adjusting support sleeve 8, thereby cutting the thin-walled tube.

[0089] The rotation direction of the cutting blade 3 is opposite to that of the thin-walled pipe, and there is a speed difference between the cutting blade 3 and the thin-walled pipe;

[0090] Since the fixed support sleeve 7 and the adjusting support sleeve 8 can provide support for the cutting part of the thin-walled pipe to fit the cutting point, the thin-walled pipe will not undergo inward deformation during cutting.

[0091] S3. When the cutting blade 3 cuts through the thin-walled pipe and falls between the two positioning sensors 10 of the fixed support sleeve 7 and the adjusting support sleeve 8, the lifting drive frame 2 stops descending, so that the cutting blade 3 stays at that position to continue cutting.

[0092] S4. Cutting is completed after the thin-walled tube has rotated one revolution.

[0093] In addition, before performing S1, the staff can adjust the distance between the fixed support sleeve 7 and the adjusting support sleeve 8 according to the wall thickness of the thin-walled pipe fitting to achieve the best support effect at the cutting point of the thin-walled pipe fitting.

[0094] 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 precision cutting device for thin-walled pipe fittings, comprising a device base (1), a fixing frame (12) mounted on the device base (1), auxiliary support members (11) mounted on the upper surface of the device base (1) and the upper end of the fixing frame (12), the auxiliary support members (11) being used for rolling clamping of thin-walled pipe fittings, a lifting drive frame (2) fixed to the rear side of the device base (1), a cutting blade (3) vertically and vertically mounted on the lifting drive frame (2), a servo motor for driving the cutting blade (3) to rotate being mounted on one side of the cutting blade (3), and a side plate fixed to one end of the device base (1), characterized in that: A main shaft (4) is rotatably connected to the side plate, and the other end of the main shaft (4) extends toward the other end of the equipment base (1); A fixed support sleeve (7) is fixedly sleeved on the main shaft (4), and an adjustable support sleeve (8) is also adjustablely sleeved on the main shaft (4). The adjustable support sleeve (8) can be adjusted horizontally along the axis of the main shaft (4). The fixed support sleeve (7) and the adjustable support sleeve (8) are symmetrically arranged about the cutting surface of the cutting blade (3), and there is a gap between the sidewalls of the fixed support sleeve (7) and the adjustable support sleeve (8) on the side closest to each other and the sidewall of the cutting blade (3). A drive motor (5) for driving the main shaft (4) to rotate is installed at the end of the side plate of the equipment base (1) away from the main shaft (4). The upper surface of the equipment base (1) is also equipped with a pull assembly (9). The pull assembly (9) cooperates with the fixed support sleeve (7) to roll and pull the thin-walled tube from one end of the thin-walled tube, and cooperates with multiple auxiliary support members (11) to keep the thin-walled tube stable before and after cutting. Specifically, the pull assembly (9) includes a fixed frame (91), a tension spring (92), a slider (93), and a pressure rod (94). The fixed frame (91) is fixed to the upper surface of the equipment base (1), the slider (93) is slidably embedded in the fixed frame (91), the upper and lower ends of the tension spring (92) are respectively fixed to the bottom surface of the slider (93) and the bottom wall of the fixed frame (91), and the pressure rod (94) is rotatably connected to one side of the slider (93) through a rotating shaft. The end of the pressure rod (94) away from the side plate of the equipment base (1) is shaped like a frustum; The fixed support sleeve (7) and the adjusting support sleeve (8) are both fixedly embedded with positioning sensors (10) on the side walls of their respective ends. The positioning sensors (10) are used to sense the cutting depth of the cutting blade (3) and control the lifting drive frame (2) to stop when the blade of the cutting blade (3) coincides with the detection range of the positioning sensor (10), so that the cutting blade (3) stops descending.

2. The precision cutting device for thin-walled pipes according to claim 1, characterized in that: One end of the main shaft (4) is connected to the output shaft of the drive motor (5) for transmission. The end of the main shaft (4) away from the drive motor (5) is provided with a reduced diameter section with a diameter smaller than the inner diameter of the adjusting support sleeve (8). A sliding groove (44) is provided on the main shaft (4). The extension direction of the sliding groove (44) is parallel to the axis of the main shaft (4), and the end opening of the sliding groove (44) is located at the end of the reduced diameter section. The main shaft (4) is provided with a threaded part (45) on the periphery of the reduced diameter section; the slide groove (44) passes through the threaded part (45) laterally. The inner side of the adjusting support sleeve (8) is fixed with a sliding rib (82) that slides in conjunction with the sliding groove (44). An adjusting ring (81) is rotatably connected to one side of the adjusting support sleeve (8). The adjusting ring (81) is threadedly adapted to the threaded part (45).

3. The precision cutting device for thin-walled pipes according to claim 2, characterized in that: The reduced diameter portion of the main shaft (4) near the threaded portion (45) has a connecting hole (46) extending radially along the main shaft (4). A limiting ring (43) is movably sleeved on the reduced diameter section of the main shaft (4). One side of the limiting ring (43) abuts against the side wall of the reduced diameter section near the threaded section (45). A fastening bolt (431) is threadedly connected to the connecting hole (46) through the limiting ring (43). The nut of the fastening bolt (431) abuts against the bottom wall of the stepped hole of the limiting ring (43).

4. The precision cutting device for thin-walled pipes according to claim 1, characterized in that: A cooling chamber (41) is provided inside the main shaft (4). The length of the cooling chamber (41) covers the gap between the fixed support sleeve (7) and the adjusting support sleeve (8). A cooling channel (42) is provided on one side of the cooling chamber (41). The cooling channel (42) extends towards the side of the main shaft (4) away from the drive motor (5). A rotating joint (47) communicating with the cooling channel (42) is rotatably connected to the end of the main shaft (4) away from the drive motor (5). A circulation pump (6) is fixed on the side plate of the equipment base (1). The circulation pump (6) is connected to the rotary joint (47) through the circulation pipe (61). When the circulation pump (6) is started, it circulates coolant into the rotary joint (47) through the circulation pipe (61).

5. The precision cutting device for thin-walled pipes according to claim 4, characterized in that: The cooling channel (42) includes a water inlet channel (421) and a water outlet channel (422). The water inlet channel (421) is coaxially arranged with the main shaft (4), and the water outlet channel (422) is parallel to the axis of the main shaft (4). The rotary joint (47) includes an inlet joint (471) communicating with the inlet channel (421) and an outlet joint (472) communicating with the outlet channel (422). The water inlet channel (421) and the water outlet channel (422), and the water inlet connector (471) and the water outlet connector (472) are not connected to each other; In addition, the circulation pipe (61) is provided in two parts and is fixed and connected to the inlet connector (471) and the outlet connector (472) respectively. The circulation pipe (61) connected to the inlet connector (471) is connected to the output end of the circulation pump (6), and the circulation pipe (61) connected to the outlet connector (472) is connected to the input end of the circulation pump (6).

6. The precision cutting device for thin-walled pipes according to claim 1, characterized in that: The auxiliary support (11) includes a fixed seat (111), a sliding seat (112), a support wheel (113), and a compression spring (114). An auxiliary support (11) installed on the equipment base (1) is set upwards. The lower end of the fixed seat (111) is fixed to the upper end surface of the equipment base (1). The lower end of the sliding seat (112) is elastically slidably connected to the fixed seat (111) through a compression spring (114). The support wheel (113) is rotatably connected to the upper end of the sliding seat (112). The axial direction of the support wheel (113) is parallel to the axial direction of the main shaft (4). The auxiliary support (11) installed on the fixed frame (12) is set downward.

7. The precision cutting device for thin-walled pipes according to claim 1, characterized in that: The rotation direction of the cutting blade (3) is opposite to that of the spindle (4), and there is a speed difference between the cutting blade (3) and the spindle (4).

8. A method for preventing deformation during cutting of thin-walled pipe fittings, applied in a precision cutting device for thin-walled pipe fittings as described in claim 1, characterized in that: Includes the following steps: S1. Insert the thin-walled tube into the main shaft (4) from the end away from the drive motor (5), and press down the inner wall of the end of the thin-walled tube by the pull assembly (9), so that the thin-walled tube is clamped by the fixed support sleeve (7), the adjusting support sleeve (8) and the pull assembly (9). At the same time, multiple sets of auxiliary support parts (11) assist in clamping the thin-walled tube along the outer wall of the thin-walled tube. S2. Turn on the drive motor (5), the lifting drive frame (2), and the servo motor that drives the cutting blade (3) to rotate, so that the cutting blade (3) rotates and moves down, and at the same time, the spindle (4) drives the thin-walled pipe to rotate through the fixed support sleeve (7) and the adjusting support sleeve (8), thereby cutting the thin-walled pipe. S3. When the cutting blade (3) cuts through the thin-walled pipe and falls between the two positioning sensors (10) of the fixed support sleeve (7) and the adjusting support sleeve (8), the lifting drive frame (2) stops descending, so that the cutting blade (3) stays at that position and continues to cut. S4. The cutting is completed after the thin-walled pipe has rotated one revolution.

9. A method for preventing deformation during cutting of thin-walled pipe fittings according to claim 8, characterized in that: In S2, the rotation direction of the cutting blade (3) is opposite to the rotation direction of the thin-walled pipe, and there is a speed difference between the cutting blade (3) and the thin-walled pipe; In S2, since the fixed support sleeve (7) and the adjusting support sleeve (8) can support the cutting part of the thin-walled pipe in close contact with the cutting point, the thin-walled pipe will not undergo concave deformation during cutting. In addition, before performing S1, the staff can adjust the distance between the fixed support sleeve (7) and the adjusting support sleeve (8) according to the wall thickness of the thin-walled pipe fitting to achieve the best support effect for the cutting point of the thin-walled pipe fitting.

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