Precise cutting device for thin-wall pipe fitting and anti-deformation cutting method

Abstract

The invention discloses a thin-wall pipe fitting precise cutting device and an anti-deformation cutting method, and relates to the technical field of thin-wall pipe fitting production.The thin-wall pipe fitting precise cutting device comprises an equipment base, a fixing frame is installed on the equipment base, auxiliary supporting pieces are installed on the upper surface of the equipment base and the upper end of the fixing frame correspondingly, and the auxiliary supporting pieces are used for clamping a thin-wall pipe fitting in a rolling mode; a lifting driving frame is fixed to the rear side of the equipment base, a cutting knife is vertically installed on the lifting driving frame in a lifting mode, the main shaft, the fixed supporting sleeve and the adjusting supporting sleeve are arranged and used in cooperation with an opposite-pulling assembly and an auxiliary supporting piece, the fixed supporting sleeve and the adjusting supporting sleeve can support a cut part of a thin-wall pipe fitting in a mode of being attached to a cutting point, and therefore the thin-wall pipe fitting can be cut conveniently. Concave deformation of the thin-wall pipe fitting is avoided when the thin-wall pipe fitting is cut. In addition, the worker can adjust the distance between the fixed supporting sleeve and the adjusting supporting sleeve according to the wall thickness of the thin-wall pipe fitting, the optimal supporting effect of the cutting point of the thin-wall pipe fitting is achieved, and the finished product percent of pass of the cut thin-wall pipe fitting is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of thin-walled pipe production, and in particular to a thin-walled pipe precision cutting device and an anti-deformation cutting method. Background Art

[0002] Thin-walled tubes are made by perforating steel ingots or solid tubes into rough tubes, and then hot-rolling, cold-rolling or cold-drawing. Thin-walled tubes play an important role in my country's steel pipe industry. The raw material of thin-walled tubes is round tube billets, which are cut by a cutting machine into billets with a length of about 1 meter and sent to the furnace for heating via a conveyor belt.

[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 the thin-walled pipes, special attention should be paid to the deformation of the ends of the pipes, that is, the deformation of the thin-walled pipes at the cutting point. There are various cutting devices in the prior art that can reduce the deformation of thin-walled pipes.

[0004] As disclosed in the patent document with publication number "CN111660358B", an anti-deformation cutting device for pipe production includes a slide, the inner side of the slide is connected to a fixed sleeve through a pneumatic telescopic rod, the fixed sleeve has two groups, each group of the fixed sleeve includes two semicircular sleeves with two ends fitted together, the interior of the semicircular sleeve is hollow, and the concave surface of the outer side of the semicircular sleeve is provided with a plurality of through holes, a sealing gasket is fixedly connected to the concave surface of the outer side of the semicircular sleeve, a fixed cylinder is fixedly connected at the top end of the slide, the fixed cylinder is transmitted to the pneumatic telescopic rod through an airway, the pneumatic telescopic rod is connected to the pressure regulating mechanism through a hose, and a knife holder slidably connected to the slide is provided on the inner side of the slide.

[0005] For another example, a patent document with publication number "CN113618146B" discloses a thin-walled steel pipe anti-deformation cutting device, including a support plate and a motor, wherein the motor is fixedly mounted on the side of the support plate, a power mechanism is fixedly mounted on the side of the support plate, a rotating mechanism is sleeved on the outer surface of the power mechanism, 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 in combination with the prior art, it is found that the existing thin-walled pipe precision cutting devices have certain defects when used. For example, the patent document with the publication number "CN111660358B" discloses a solution of reducing the external pressure during cutting by changing the air pressure inside the pipe. However, the pressure becomes uncontrollable as the cutting proceeds, and the pressure is unreliable when the cutting produces vibrations. Therefore, the anti-deformation effect is not ideal. Another example is the patent document with the publication number "CN113618146B". The solution disclosed is internal cutting and external auxiliary tightening through a hoop body. However, the gap between the hoop bodies is large and difficult to adjust, and it is impossible to provide good limiting support for the cut part of the pipe, so that the anti-deformation effect is not ideal. Therefore, a thin-walled pipe precision cutting device and an anti-deformation cutting method are needed. Summary of the invention

[0007] The purpose of the present application is to provide a thin-walled pipe precision cutting device and an anti-deformation cutting method to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a device for accurately cutting thin-walled pipe fittings, comprising a device base, a fixing frame installed on the device base, auxiliary support members installed on the upper surface of the device base and the upper end of the fixing frame, the auxiliary support members roll to clamp the thin-walled pipe fittings, a lifting drive frame fixed to the rear side of the device base, a cutting knife vertically lifted and lowered on the lifting drive frame, a servo motor for driving the cutting knife to rotate is also installed on one side of the cutting knife, and a side plate is also fixed to one end of the device base;

[0009] The side plate is rotatably connected with a main shaft, and the other end of the main shaft extends to the other end of the equipment base;

[0010] A fixed sleeve is provided on the main shaft, and an adjustable sleeve is provided on the main shaft. The adjustable sleeve can be horizontally moved and adjusted along the axis direction of the main shaft. The fixed sleeve and the adjustable sleeve are symmetrically arranged with respect to the cutting surface of the cutting knife, and there is a gap between the side walls of the fixed sleeve and the adjustable sleeve on the side close to each other and the side wall of the cutting knife;

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

[0012] Among them, a pulling component is also installed on the upper surface of the equipment base. The pulling component cooperates with the fixed support sleeve to roll and pull the thin-walled pipe from one end of the thin-walled pipe, and cooperates with multiple auxiliary support members to keep the thin-walled pipe stable before and after cutting;

[0013] The side walls of the fixed support sleeve and the adjustable support sleeve close to one end are fixedly embedded with positioning sensors, which are used to sense the cutting depth of the cutting knife and control the lifting drive frame to stop when the blade of the cutting knife coincides with the detection range of the positioning sensor itself, so that the cutting knife stops descending.

[0014] As a further supplement to the present solution, one end of the main shaft is drivingly connected to the output shaft of the driving motor, and the end of the main shaft away from the driving motor is provided with a reduced diameter portion having a diameter smaller than the inner diameter of the adjusting support sleeve, and a slide groove is provided on the main shaft, the extension direction of the slide groove is parallel to the axis of the main shaft, and the end opening of the slide groove is located at the end of the reduced diameter portion;

[0015] The main shaft is provided with a threaded portion on the peripheral side of the reduced diameter portion; the slide groove passes through the threaded portion transversely;

[0016] A sliding rib which is slidably matched with the sliding groove is fixed on the inner side of the adjusting support sleeve, and an adjusting ring is rotatably connected to one side of the adjusting support sleeve, and the adjusting ring is threadably matched with the threaded part.

[0017] As a further supplement to this solution, a connecting hole extending in the radial direction of the main shaft is provided at one end of the reduced diameter portion of the main shaft close to the threaded portion;

[0018] A limiting ring is provided on the movable sleeve of the reduced diameter part of the main shaft, one side of the limiting ring is pressed against the side wall of the reduced diameter part close to the threaded part, a fastening bolt threadedly connected to the connecting hole is penetrated through the limiting ring, and the nut part of the fastening bolt is pressed against the bottom wall of the stepped hole of the limiting ring.

[0019] As a further supplement to the present solution, a cooling cavity is provided in the spindle, the length of which covers the gap between the fixed support sleeve and the adjustable support sleeve, a cooling channel is provided on one side of the cooling cavity, the cooling channel extends to the side of the spindle away from the drive motor, and the end of the spindle away from the drive motor is rotatably connected to a rotating joint connected to the cooling channel;

[0020] A circulation pump is fixed on the side plate of the equipment base, and the circulation pump is connected with the rotating joint through a circulation pipe. When the circulation pump is started, the coolant is circulated and transported to the rotating joint through the circulation pipe.

[0021] As a further supplement to this solution, the cooling channel includes a water inlet channel and a water outlet channel, the water inlet channel is coaxially arranged with the main shaft, and the water outlet channel is parallel to the axis of the main shaft;

[0022] The rotary joint includes a water inlet joint communicated with the water inlet channel and a water outlet joint communicated with the water outlet channel;

[0023] The water inlet channel and the water outlet channel, the water inlet joint and the water outlet joint are not connected to each other;

[0024] In addition, two circulation pipes are provided and are respectively fixed and connected to the water inlet joint and the water outlet joint. The circulation pipe connected to the water inlet joint is connected to the output end of the circulation pump, and the circulation pipe connected to the water outlet joint is connected to the input end of the circulation pump.

[0025] As a further supplement to this solution, the tension assembly includes a fixed frame, a tension spring, a slider and a push 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 respectively fixed to the bottom surface of the slider and the bottom wall of the fixed frame, and the lower pressure rod is rotatably connected to one side of the slider through a rotating shaft;

[0027] Wherein, one end of the pressing rod away from the side plate of the equipment base is formed into a frustum shape.

[0028] As a further supplement to this solution, the auxiliary support member includes a fixed seat, a sliding seat, a support wheel and a compression spring;

[0029] The auxiliary support member installed on the equipment base is arranged upward, 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 supporting wheel is rotatably connected to the upper end of the sliding seat, and the axial direction of the supporting wheel is parallel to the axial direction of the main shaft;

[0030] Wherein, the auxiliary support member installed on the fixing frame is arranged downward.

[0031] As a further supplement to the present solution, the rotation direction of the cutting knife is opposite to the rotation direction of the main shaft, and there is a rotation speed difference between the cutting knife and the main shaft.

[0032] The present application also discloses: a thin-walled pipe deformation prevention cutting method, which is applied to a thin-walled pipe precision cutting device as described above, comprising the following steps:

[0033] S1. Insert the thin-walled pipe from the end of the main shaft away from the driving motor onto the main shaft, and make the inner wall of the end of the thin-walled pipe be pressed down by the tension assembly, so that the thin-walled pipe is clamped by the fixed support sleeve, the adjustable support sleeve and the tension assembly, and at the same time, multiple groups of auxiliary support members assist in clamping the thin-walled pipe along the outer wall of the thin-walled pipe;

[0034] S2, turning on the drive motor, the lifting drive frame and the servo motor that drives the cutting knife to rotate, so that the cutting knife rotates and moves downward, and at the same time, the spindle drives the thin-walled pipe to rotate through the fixed support sleeve and the adjustable support sleeve, thereby cutting the thin-walled pipe;

[0035] S3, when the cutting blade cuts through the thin-walled pipe and falls between the two relative positioning sensors of the fixed support sleeve and the adjustable support sleeve, the lifting drive frame stops descending, so that the cutting blade stays at this position for continuous cutting;

[0036] S4. Cutting is completed after the thin-walled pipe rotates one circle.

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

[0038] In S2, since the fixed support sleeve and the adjustable support sleeve can support the cut portion of the thin-walled pipe fitting in close contact with the cutting point, the thin-walled pipe will not be deformed inward during cutting;

[0039] In addition, before performing S1, the staff can also adjust the distance between the fixed support sleeve and the adjustable support sleeve 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 the present invention are as follows:

[0041] 1. In the present invention, by setting the main shaft, the fixed support sleeve and the adjustable support sleeve, and using them in conjunction with the pulling assembly and the auxiliary support member, the fixed support sleeve and the adjustable support sleeve can support the cut portion of the thin-walled pipe fitting to fit the cutting point, so that the thin-walled pipe will not be deformed inward during cutting; in addition, the staff can also adjust the distance between the fixed support sleeve and the adjustable support sleeve according to the wall thickness of the thin-walled pipe fitting to achieve the best support effect of the cutting point of the thin-walled pipe fitting, thereby ensuring the qualified rate of the finished thin-walled pipe fittings after cutting.

[0042] 2. In the present invention, by circulating coolant into the cooling chamber, the main shaft and the ends of the corresponding fixed support sleeve and the adjustable support sleeve close to each other are cooled, so that the cutting point of the thin-walled pipe can be cooled to avoid phase change caused by excessive temperature in the cutting part of the thin-walled pipe during cutting, and finally further improve the effect of preventing deformation of the ends of the thin-walled pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 Schematic diagram of the three-dimensional structure in this embodiment;

[0045] Figure 2 Schematic diagram of the cross-sectional structure of the main shaft, the fixed support sleeve and the adjustable support sleeve in this embodiment;

[0046] Figure 3 for Figure 2A magnified view of the structure at center;

[0047] Figure 4 Schematic diagram of the local structure of the main shaft in this embodiment;

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

[0049] Figure 6 It is a schematic diagram of the structure of the tensioning assembly and the auxiliary support member in this embodiment;

[0050] Figure 7 It is a schematic diagram of the side view structure when cutting thin-walled pipe fittings in this embodiment.

[0051] In the figure: 1. Equipment base; 11. Auxiliary support member; 111. Fixed seat; 112. Sliding seat; 113. Support wheel; 114. Compression spring; 12. Fixed frame; 2. Lifting drive frame; 3. Cutting knife; 4. Spindle; 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. Rotating joint; 471. Water inlet joint; 472. Water outlet joint; 5. Driving motor; 6. Circulating pump; 61. Circulating pipeline; 7. Fixed support sleeve; 8. Adjusting support sleeve; 81. Adjusting ring; 82. Sliding rib; 9. Pulling assembly; 91. Fixed frame; 92. Tension spring; 93. Sliding block; 94. Pressing rod; 10. Positioning sensor. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] Example:

[0054] refer to Figure 1-Figure 7 A thin-walled pipe precision cutting device shown in the figure comprises an equipment base 1, a fixing frame 12 is installed on the equipment base 1, an auxiliary support member 11 is installed on the upper surface of the equipment base 1 and the upper end of the fixing frame 12, the auxiliary support member 11 is used to roll and clamp the thin-walled pipe, a lifting drive frame 2 is fixed to the rear side of the equipment base 1, a cutting knife 3 is vertically lifted and installed on the lifting drive frame 2, a servo motor for driving the cutting knife 3 to rotate is also installed on one side of the cutting knife 3, and a side plate is also fixed to one end of the equipment base 1;

[0055] The side plate is rotatably connected to a main shaft 4, and the other end of the main shaft 4 extends to the other end of the equipment base 1;

[0056] A fixed sleeve 7 is fixedly provided on the main shaft 4, and an adjustable sleeve 8 is also adjustable on the main shaft 4. The adjustable sleeve 8 can be horizontally moved and adjusted along the axis direction of the main shaft 4. The fixed sleeve 7 and the adjustable sleeve 8 are symmetrically arranged with respect to the cutting surface of the cutting knife 3, and there is a gap between the side walls of the fixed sleeve 7 and the adjustable sleeve 8 on the side close to each other and the side wall of the cutting knife 3;

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

[0058] Among them, a pulling component 9 is also installed on the upper surface of the equipment base 1. The pulling component 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 of the thin-walled pipe, and cooperates with multiple auxiliary support members 11 to keep the thin-walled pipe stable before and after cutting;

[0059] The side walls of the fixed support sleeve 7 and the adjustable support sleeve 8 close to one end are fixedly embedded with a positioning sensor 10, which is used to sense the cutting depth of the cutting knife 3 and control the lifting drive frame 2 to stop when the blade of the cutting knife 3 coincides with the detection range of the positioning sensor 10 itself, so that the cutting knife 3 stops descending.

[0060] Based on the above structure, when it is necessary to cut the thin-walled pipe fitting, the staff first inserts the thin-walled pipe fitting from the end of the main shaft 4 away from the driving motor 5 onto the main shaft 4, and makes the inner wall of the end of the thin-walled pipe fitting be pressed down by the pulling component 9, so that the thin-walled pipe fitting is clamped by the fixed support sleeve 7, the adjusting support sleeve 8 and the pulling component 9, and at the same time, multiple groups of auxiliary support members 11 assist in clamping the thin-walled pipe fitting along the outer wall of the thin-walled pipe fitting; then turn on the driving motor 5 and the lifting driving frame 2 and the servo motor that drives the cutting knife 3 to rotate, so that the cutting knife 3 rotates and moves downward, and at the same time, the main shaft 4 drives the thin-walled pipe fitting to rotate through the fixed support sleeve 7 and the adjusting support sleeve 8, so as to cut the thin-walled pipe fitting, when the blade of the cutting knife 3 cuts through the thin-walled pipe fitting and falls between the two relative positioning sensors 10 of the fixed support sleeve 7 and the adjusting support sleeve 8, the lifting driving frame 2 stops descending, so that the cutting knife 3 stays at this position for continuous cutting until the thin-walled pipe fitting rotates one circle and the cutting is completed;

[0061] Since the fixed support sleeve 7 and the adjustable support sleeve 8 can support the cut part of the thin-walled pipe fitting to fit the cutting point, the thin-walled pipe fitting will not be deformed inward during cutting; in addition, the staff can also 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 of the cutting point of the thin-walled pipe fitting, thereby ensuring the qualified rate of the finished thin-walled pipe fittings after cutting.

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

[0063] Further, one end of the main shaft 4 is drivingly connected to the output shaft of the driving motor 5, and the end of the main shaft 4 away from the driving motor 5 is provided with a reduced diameter portion having a diameter smaller than the inner diameter of the adjusting support sleeve 8, and 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 portion;

[0064] The main shaft 4 is also provided with a threaded portion 45 on the peripheral side of the reduced diameter portion; the slide groove 44 passes through the threaded portion 45 transversely;

[0065] A sliding rib 82 that slidably cooperates with the sliding groove 44 is fixed to the inner side of the adjusting support sleeve 8 , and an adjusting ring 81 is rotatably connected to one side of the adjusting support sleeve 8 , and the adjusting ring 81 is threadably adapted to the threaded portion 45 .

[0066] When it is necessary to adjust the position of the adjusting sleeve 8, the staff only needs to rotate the adjusting ring 81 so that the adjusting ring 81 interacts with the threaded portion 45, so that the adjusting ring 81 moves horizontally along the axial direction of the main shaft 4, thereby driving the adjusting sleeve 8 to move horizontally, and the adjusting sleeve 8 slides with the sliding groove 44 through the sliding rib 82. Therefore, after adjusting the position of the adjusting sleeve 8, the adjusting sleeve 8 is still affected by the rotation of the main shaft 4 and rotates to ensure the transmission effect between the two. By adjusting the adjusting sleeve 8, the gap between the fixed sleeve 7 and the adjusting sleeve 8 can be changed, so that the inner wall of thin-walled pipes with different wall thicknesses can be well supported to prevent the thin-walled pipes from being deformed during the cutting process.

[0067] Furthermore, a connecting hole 46 extending in the radial direction of the main shaft 4 is formed at one end of the reduced diameter portion of the main shaft 4 close to the threaded portion 45;

[0068] A limit ring 43 is movably sleeved on the reduced diameter portion of the main shaft 4, one side of the limit ring 43 is pressed against the side wall of the reduced diameter portion close to the threaded portion 45, a fastening bolt 431 threadedly connected to the connecting hole 46 is penetrated by the limit ring 43, and the nut portion of the fastening bolt 431 is pressed against the bottom wall of the stepped hole of the limit ring 43.

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

[0070] Furthermore, a cooling cavity 41 is provided in the spindle 4, the length of which covers the gap between the fixed support sleeve 7 and the adjustable support sleeve 8, a cooling channel 42 is provided on one side of the cooling cavity 41, the cooling channel 42 extends to the side of the spindle 4 away from the drive motor 5, and the end of the spindle 4 away from the drive motor 5 is rotatably connected to a rotating joint 47 connected to the cooling channel 42;

[0071] A circulation pump 6 is fixed on the side plate of the equipment base 1 , and the circulation pump 6 is connected to the rotary joint 47 through a circulation pipe 61 . When the circulation pump 6 is started, the cooling liquid is circulated and transported to the rotary joint 47 through the circulation pipe 61 .

[0072] By circulating coolant (such as water) into the cooling chamber 41, the main shaft 4 and the corresponding ends of the fixed support sleeve 7 and the adjustable support sleeve 8 close to each other are cooled, so that the cutting point of the thin-walled pipe can be cooled to avoid phase change caused by excessive temperature in the cutting part of the thin-walled pipe during cutting, and finally further improve the effect of preventing deformation of the ends of the thin-walled pipe.

[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 rotating joint 47 includes a water inlet joint 471 communicating with the water inlet channel 421 and a water outlet joint 472 communicating with the water outlet channel 422;

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

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

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

[0078] The fixed frame 91 is fixed to the upper surface of the device 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 lower pressure rod 94 is rotatably connected to one side of the slider 93 through a rotating shaft;

[0079] Among them, the end of the pressing 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 staff can manually lift the lower pressure rod 94 or the slider 93 to raise the lower pressure rod 94 and make the lower pressure rod 94 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 with the inner wall of the thin-walled pipe, so that the lower pressure rod 94 can cooperate with the fixed support sleeve 7 and the adjustable 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 member 11 includes a fixed seat 111, a sliding seat 112, a support wheel 113 and a compression spring 114;

[0082] The auxiliary support member 11 installed on the equipment base 1 is arranged 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 a compression spring 114, the support wheel 113 is rotatably connected to the upper end of the sliding seat 112, and the axial direction of the support wheel 113 is parallel to the axial direction of the main shaft 4;

[0083] The auxiliary support member 11 installed on the fixing frame 12 is arranged downward.

[0084] A plurality of support wheels 113 are arranged around the circumference of the thin-walled pipe fitting and roll in contact with the outer wall of the thin-walled pipe fitting. At the same time, under the elastic force of the compression spring 114, the thin-walled pipe fitting can be flexibly clamped to play an auxiliary supporting role, so that the two sections of thin-walled pipe fittings after cutting have stable support, avoiding the deviation of the thin-walled pipe fitting during cutting.

[0085] It should be noted that the rotation direction of the cutting knife 3 is opposite to that of the main shaft 4, and there is a speed difference between the cutting knife 3 and the main shaft 4, so that the thin-walled pipe can rotate opposite to the cutting knife 3, thereby facilitating circumferential cutting of the thin-walled pipe.

[0086] A thin-walled pipe deformation prevention cutting method is applied to the above-mentioned thin-walled pipe precision cutting device, comprising the following steps:

[0087] S1, insert the thin-walled pipe from the end of the main shaft 4 away from the driving motor 5 onto the main shaft 4, and make the inner wall of the end of the thin-walled pipe be pressed down by the tension component 9, so that the thin-walled pipe is clamped by the fixed support sleeve 7, the adjustable support sleeve 8 and the tension component 9, and at the same time, multiple groups of auxiliary support members 11 assist in clamping the thin-walled pipe along the outer wall of the thin-walled pipe;

[0088] S2, turning on the drive motor 5, the lifting drive frame 2 and the servo motor driving the cutting knife 3 to rotate, so that the cutting knife 3 rotates and moves downward, and at the same time, the spindle 4 drives the thin-walled pipe to rotate through the fixed support sleeve 7 and the adjustable support sleeve 8, thereby cutting the thin-walled pipe;

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

[0090] Since the fixed support sleeve 7 and the adjustable support sleeve 8 can support the cut portion of the thin-walled pipe fitting in close contact with the cutting point, the thin-walled pipe will not be deformed inward when being cut;

[0091] S3, when the blade of the cutting knife 3 cuts through the thin-walled pipe and falls between the two opposite positioning sensors 10 of the fixed support sleeve 7 and the adjustable support sleeve 8, the lifting drive frame 2 stops descending, so that the cutting knife 3 stays at this position for continuous cutting;

[0092] S4. Cutting is completed after the thin-walled pipe rotates one circle.

[0093] In addition, before performing S1, the staff can also 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 of the cutting point of the thin-walled pipe fitting.

[0094] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for accurately cutting thin-walled pipe fittings, comprising a device base (1), a fixing frame (12) being mounted on the device base (1), an auxiliary support member (11) being mounted on the upper surface of the device base (1) and the upper end of the fixing frame (12), the auxiliary support member (11) being used to roll and clamp the thin-walled pipe fittings, a lifting drive frame (2) being fixed on the rear side of the device base (1), a cutting knife (3) being mounted on the lifting drive frame (2) for vertical lifting, a servo motor for driving the cutting knife (3) to rotate being also mounted on one side of the cutting knife (3), a side plate being also fixed on one end of the device base (1), characterized in that: The side plate is rotatably connected to a main shaft (4), and the other end of the main shaft (4) extends toward the other end of the equipment base (1); The main shaft (4) is provided with a fixed support sleeve (7) on the fixed sleeve, and the main shaft (4) is provided with an adjustable support sleeve (8) on the adjustable sleeve. The adjustable support sleeve (8) can be horizontally moved and adjusted along the axis direction of the main shaft (4). The fixed support sleeve (7) and the adjustable support sleeve (8) are symmetrically arranged with respect to the cutting surface of the cutting knife (3), and there is a gap between the side walls of the fixed support sleeve (7) and the adjustable support sleeve (8) on the side close to each other and the side wall of the cutting knife (3); A driving motor (5) for driving the main shaft (4) to rotate is installed at one end of the side plate of the equipment base (1) away from the main shaft (4); A pulling assembly (9) is also installed on the upper surface of the equipment base (1), and the pulling assembly (9) cooperates with the fixed support sleeve (7) to roll and pull the thin-walled pipe from one end of the thin-walled pipe, and cooperates with the plurality of auxiliary support members (11) to keep the thin-walled pipe stable before and after cutting; A positioning sensor (10) is fixedly embedded in the side walls of the fixed support sleeve (7) and the adjustable support sleeve (8) at one end thereof. The positioning sensor (10) is used to sense the cutting depth of the cutting knife (3) and control the lifting drive frame (2) to stop when the blade of the cutting knife (3) coincides with the detection range of the positioning sensor (10), so that the cutting knife (3) stops descending.

2. A device for accurately cutting thin-walled pipes according to claim 1, characterized in that: One end of the main shaft (4) is drivingly connected to the output shaft of the driving motor (5); the end of the main shaft (4) away from the driving motor (5) is provided with a reduced diameter portion whose diameter is 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 portion; The main shaft (4) is also provided with a threaded portion (45) on the peripheral side of the reduced diameter portion; the slide groove (44) passes through the threaded portion (45) transversely; A sliding rib (82) that is slidably matched with the sliding groove (44) is fixed on the inner side of the adjusting support sleeve (8), and an adjusting ring (81) is rotatably connected to one side of the adjusting support sleeve (8), and the adjusting ring (81) is threadably matched with the threaded portion (45).

3. The device for accurately cutting thin-walled pipes according to claim 2, characterized in that: A connecting hole (46) extending in the radial direction of the main shaft (4) is provided at one end of the reduced diameter portion of the main shaft (4) close to the threaded portion (45); A limiting ring (43) is movably sleeved on the reduced diameter portion of the main shaft (4), one side of the limiting ring (43) is pressed against the side wall of the reduced diameter portion close to the threaded portion (45), a fastening bolt (431) threadedly connected to the connecting hole (46) is passed through the limiting ring (43), and the nut portion of the fastening bolt (431) is pressed against the bottom wall of the stepped hole of the limiting ring (43).

4. The device for accurately cutting thin-walled pipes according to claim 1, characterized in that: A cooling cavity (41) is provided in the main shaft (4), the length of the cooling cavity (41) covers the gap between the fixed support sleeve (7) and the adjustable support sleeve (8), a cooling channel (42) is provided on one side of the cooling cavity (41), the cooling channel (42) extends to a side of the main shaft (4) away from the drive motor (5), and an end of the main shaft (4) away from the drive motor (5) is rotatably connected to a rotating joint (47) in communication with the cooling channel (42); 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 a circulation pipe (61); when the circulation pump (6) is started, the circulation pump (6) circulates the cooling liquid into the rotary joint (47) through the circulation pipe (61).

5. The device for accurately cutting thin-walled pipes according to claim 4, characterized in that: The cooling channel (42) comprises a water inlet channel (421) and a water outlet channel (422), wherein 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 rotating joint (47) comprises a water inlet joint (471) communicating with the water inlet channel (421) and a water outlet joint (472) communicating with the water outlet channel (422); Wherein, the water inlet channel (421) and the water outlet channel (422), and the water inlet joint (471) and the water outlet joint (472) are not connected to each other; In addition, two circulation pipes (61) are provided and are respectively fixed to and connected with the water inlet joint (471) and the water outlet joint (472); the circulation pipe (61) connected with the water inlet joint (471) is connected with the output end of the circulation pump (6), and the circulation pipe (61) connected with the water outlet joint (472) is connected with the input end of the circulation pump (6).

6. The device for accurately cutting thin-walled pipes according to claim 1, characterized in that: The pulling assembly (9) comprises a fixing frame (91), a tension spring (92), a sliding block (93) and a pressing rod (94); The fixed frame (91) is fixed to the upper surface of the device 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 inner bottom wall of the fixed frame (91), and the lower pressure rod (94) is rotatably connected to one side of the slider (93) through a rotating shaft; Wherein, the end of the pressing rod (94) away from the side plate of the equipment base (1) is formed into a frustum shape.

7. The device for accurately cutting thin-walled pipes according to claim 1, characterized in that: The auxiliary support member (11) comprises a fixed seat (111), a sliding seat (112), a supporting wheel (113) and a compression spring (114); The auxiliary support member (11) mounted on the device base (1) is arranged upward, the lower end of the fixed seat (111) is fixed to the upper end surface of the device base (1), the lower end of the sliding seat (112) is elastically slidably connected to the fixed seat (111) via a compression spring (114), the support wheel (113) is rotatably connected to the upper end of the sliding seat (112), and the axial direction of the support wheel (113) is parallel to the axial direction of the main shaft (4); Wherein, the auxiliary support member (11) installed on the fixing frame (12) is arranged downward.

8. The device for accurately cutting thin-walled pipes according to claim 1, characterized in that: The rotation direction of the cutting knife (3) is opposite to the rotation direction of the main shaft (4), and there is a rotation speed difference between the cutting knife (3) and the main shaft (4).

9. A method for cutting thin-walled pipes to prevent deformation, applied to a device for accurately cutting thin-walled pipes as claimed in claim 1, characterized in that: The following steps are involved: S1, inserting the thin-walled pipe fitting from the end of the main shaft (4) away from the driving motor (5) onto the main shaft (4), and pressing the inner wall of the end of the thin-walled pipe fitting downward by the tensioning assembly (9), so that the thin-walled pipe fitting is clamped by the fixed support sleeve (7), the adjustable support sleeve (8) and the tensioning assembly (9), and at the same time, multiple groups of auxiliary support members (11) are used to assist in clamping the thin-walled pipe fitting along the outer wall of the thin-walled pipe fitting; S2, turning on the driving motor (5), the lifting driving frame (2) and the servo motor driving the cutting knife (3) to rotate, so that the cutting knife (3) rotates and moves downward, and at the same time, the main shaft (4) drives the thin-walled pipe to rotate through the fixed support sleeve (7) and the adjustable support sleeve (8), thereby cutting the thin-walled pipe; S3, when the blade of the cutting knife (3) cuts through the thin-walled pipe and falls between the two opposite positioning sensors (10) of the fixed support sleeve (7) and the adjustable support sleeve (8), the lifting drive frame (2) stops descending, so that the cutting knife (3) stays at this position to continue cutting; S4. Cutting is completed after the thin-walled pipe rotates one circle.

10. A thin-walled pipe deformation prevention cutting method according to claim 9, characterized in that: In S2, the rotation direction of the cutting knife (3) is opposite to the rotation direction of the thin-walled pipe, and there is a rotation speed difference between the cutting knife (3) and the thin-walled pipe; In S2, since the fixed support sleeve (7) and the adjustable support sleeve (8) can support the cut portion of the thin-walled pipe fitting in a manner that fits the cutting point, the thin-walled pipe will not be deformed inward when being cut; In addition, before performing S1, the staff can also 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 of the cutting point of the thin-walled pipe fitting.

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