Self-cleaning type deburring device for metal lining plastic pipe machining

Abstract

The invention relates to the technical field of pipe machining, in particular to a self-cleaning type deburring device for metal lining plastic pipe machining, deburring, cold shrinkage and self-cleaning are integrated in the same air flow circulation, an input fan drives a coaxial impeller through an air inlet switching channel, an inner impeller rotates at a high speed, an outer impeller rotates at a low speed and rotates in the opposite directions, an outer cutting knife is driven to finish metal at a low speed, and the inner impeller rotates at a high speed; the inner cutter throws away plastic molten chips at a high speed, bidirectional axial force is counteracted in real time, an air cylinder descends after chamfering is completed, cold air directly blows a plastic lining through a shaft air groove, and the plastic lining is instantly shrunk and automatically loosened to be convenient to retract when the temperature reaches the room temperature. And finally, the air flow is accelerated through a communication pipeline of the separation output box, light plastic scraps are sucked into a collection box, heavy metal scraps are left on a buffering platform, online separation of the double materials is achieved, and secondary deposition is avoided.

Description

Technical Field

[0001] This invention relates to the field of pipe processing technology, specifically to a self-cleaning deburring device for processing metal-lined plastic pipes. Background Technology

[0002] Metal-lined plastic pipe is a composite pipe with a metal outer skeleton and a food-grade thermoplastic inner lining. It combines the strength of steel pipes with the advantages of plastic, such as corrosion resistance, non-scaling, and hygienic non-toxicity. Common lining materials are PE, PE-RT, or PPR. The outer galvanized steel pipe or seamless steel pipe is formed in one piece using a special rolling process, with a lining thickness of 2-3 mm. It has strong adhesion and can withstand vacuum negative pressure. The product strictly complies with GB / T 28897 and CJ / T 253 standards, can withstand pressures up to 2.5 MPa at room temperature, and has a long-term operating temperature range of -20℃ to 95℃, making it suitable for both hot and cold applications. Installation uses grooved, flanged, or threaded connections, eliminating the need for secondary threading, making construction convenient. The overall cost is 20% lower than that of pure plastic pipes, and the service life exceeds 50 years. It is widely used in building hot and cold water supply, fire protection, and chemical fluid transportation systems.

[0003] When cutting or chamfering, the thermal expansion coefficients and cutting performance of metal and plastic are different, which easily produces composite burrs (metal burrs + plastic melted edges). Traditional deburring methods cannot achieve both simultaneously. If the metal blade runs at high speed over the plastic, the edge melts immediately. If the plastic blade runs at low speed over the metal, the edge chipps. The process window is extremely narrow, and operators can only make compromise settings.

[0004] In view of this, we propose a self-cleaning deburring device for processing metal-lined plastic pipes. Summary of the Invention

[0005] The purpose of this invention is to provide a self-cleaning deburring device for processing metal-lined plastic pipes, to solve the problem in the background art where the different thermal expansion coefficients and cutting properties of metal and plastic materials easily lead to the generation of composite burrs. To achieve the above objective, this invention provides the following technical solution: A self-cleaning deburring device for processing metal-lined plastic pipes, comprising a device base, a mounting shell slidably connected to the top surface of the device base, a buffer platform fixedly connected to the top surface of the mounting shell, a clamping mounting arm fixedly connected to the outer surface of the device base, a pipe clamp fixedly connected to the outer surface of the clamping mounting arm, an air inlet switching channel provided on the outer surface of the device base, a coaxial impeller provided on the inner surface of the mounting shell, an outer cutting blade provided on the outer surface of the coaxial impeller, an inner cutting blade fixedly connected to one end of the coaxial impeller, and a separation output box provided on the outer surface of the buffer platform.

[0006] Preferably, the air inlet switching channel includes an input fan, which is fixedly connected to the outer surface of the device base. A lifting channel is slidably connected to the inner surface of the device base. A double input slot is fixedly connected to the inner surface of the lifting channel. An air inlet slot is formed on the outer surface of the mounting housing. An inner pipe is slidably connected to the inner surface of the lifting channel. An inner input slot is formed on the outer surface of the inner pipe. An inner baffle is fixedly connected to the outer surface of the inner pipe. An inner output slot is formed on the outer surface of the inner pipe. A lifting cylinder is fixedly connected to the outer surface of the device base.

[0007] Preferably, the output end of the input fan extends through to the inner surface of the device base, the top surface of the lifting channel is fixedly connected to the mounting housing, one end of the inner pipe is closed, the number of lifting cylinders is three and they are arranged in a ring, and the output end of the lifting cylinder is fixedly connected to the mounting housing.

[0008] Preferably, the coaxial impeller includes an inner impeller, which is rotatably connected to the inner surface of the mounting housing. An inner drive shaft is fixedly connected to the inner surface of the inner impeller, and a shaft groove is formed on the outer surface of the inner drive shaft. An outer impeller is rotatably connected to the end of the mounting housing away from the inner impeller. An outer drive shaft is fixedly connected to the inner surface of the outer impeller, and an outer mounting base is fixedly connected to the outer surface of the outer drive shaft.

[0009] Preferably, the inner drive shaft is a cylindrical tube, the inner drive shaft is slidably connected to the inner surface of the outer drive shaft, the inner impeller and the outer impeller rotate in opposite directions, and the inner surface of the inner drive shaft is slidably connected to the inner pipe.

[0010] Preferably, the external cutting tool includes a tool holder, which is slidably connected to the inner surface of the external mounting base. An adjusting screw is threadedly connected to the inner surface of the tool holder. A tool mounting base is fixedly connected to the top surface of the tool holder. An external tool is slidably connected to the inner surface of the tool mounting base. One end of the external tool is fixedly connected to an ejector spring.

[0011] Preferably, there are two tool holders that are symmetrically distributed, the adjusting screw is rotatably connected to the inner surface of the outer mounting base, and the other end of the ejector spring is fixedly connected to the inner surface of the tool mounting base.

[0012] Preferably, the internal cutting tool includes an internal support seat, which is fixedly connected to the outer surface of the internal drive shaft. A guide groove is formed on the outer surface of the internal support seat. A tool mounting ring is fixedly connected to the outer surface of the internal support seat. An internal tool is slidably connected to the inner surface of the tool mounting ring. One end of the internal tool is hinged to a tool hinge arm. A hinge limiting post is slidably connected to the inner surface of the tool hinge arm. A heating coil is fixedly connected to the outer surface of the tool mounting ring.

[0013] Preferably, the guide groove is distributed in a ring on the outer surface of the inner support, the number of inner cutters is two and they are symmetrically distributed, both ends of the cutter hinge arm are connected to the inner cutter hinge, and the hinge limiting post is slidably connected to the inner surface of the cutter mounting ring.

[0014] Preferably, the separation output box includes a connecting pipe, which is fixedly connected to the outer surface of the buffer platform. A drainage channel is fixedly connected to the outer surface of the connecting pipe, a tightening channel is fixedly connected to the inner surface of the drainage channel, a diffusion channel is fixedly connected to the bottom surface of the tightening channel, and a collection box is fixedly connected to the other end of the connecting pipe. An exhaust filter is fixedly connected to the outer surface of the collection box.

[0015] Preferably, the connecting pipe extends through to the inner surface of the mounting housing, and there are three connecting pipes arranged in a ring. The exhaust filter is located on the upper outer side of the collection box.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] In this invention, by coaxial impeller, outer cutting tool and inner cutting tool rotating in the same direction and in opposite directions with differential cutting, a composite machining effect of low-speed high-precision chamfering of metal shell and high-speed centrifugal chip removal of plastic liner with real-time bidirectional axial force cancellation is achieved. In the working process, a single airflow first drives the inner impeller at high speed and then drives the outer impeller at low speed. One cut at high speed and one cut at low speed do not require two motors. Mechanical homogeneity ensures synchronization and avoids the tool mark misalignment caused by frequency difference in traditional "dual electric spindle". At the same time, the reverse rotation balances the force on the tube opening and prevents the cut from becoming elliptical.

[0018] In this invention, by switching the air intake channel and coordinating with the airflow drive of the input fan, the transmission of "zero motor spindle" and the risk of current overload are achieved. When the lifting cylinder is raised, the double input slots are aligned with the air intake slot, and the airflow instantly drives the impeller to rotate. When it descends, the inner baffle cuts off the air path and simultaneously opens the inner output slot for cooling and contraction, thus achieving the effects of driving, collecting and cooling.

[0019] In this invention, the airflow self-cleaning mechanism, which combines the separation of the output box, the connecting pipe, and the drainage channel, achieves the self-cleaning effect of online separation of lightweight plastic shavings and heavy metal shavings, and the absence of secondary welding in the cutting zone. The airflow still has velocity after completing the work done by the impeller, and is accelerated through the narrowed cross-section connecting pipe, forming a local negative pressure at the drainage channel 72. This draws the suspended plastic shavings into the collection box and traps them through the exhaust filter. The denser metal shavings remain on the buffer platform due to inertia and can be directly recycled, avoiding the traditional "mixed shavings accumulation" that causes plastic slag to wrap around metal shavings and re-weld onto the pipe opening, forming secondary burrs. At the same time, the high-speed airflow cools the metal shavings instantly, reducing the surface oxidation color and reducing the need for subsequent acid washing processes. Attached Figure Description

[0020] Figure 1 This is a side view of the overall structure of the present invention;

[0021] Figure 2 This is a front view schematic diagram of the overall structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the internal structure of the present invention;

[0023] Figure 4 These are the components of the air intake switching channel of the present invention;

[0024] Figure 5 The components of the coaxial impeller of this invention;

[0025] Figure 6 The inner pipe, inner baffle, and inner output groove of this invention;

[0026] Figure 7 The present invention comprises an inner impeller, an outer impeller, and an outer mounting base;

[0027] Figure 8 The external mounting base and external cutting tool of the present invention;

[0028] Figure 9 These are the components of the external cutting tool of the present invention;

[0029] Figure 10 The present invention comprises a tool mounting base, an external tool, and an ejector spring;

[0030] Figure 11 These are the components of the internal cutting tool of the present invention;

[0031] Figure 12 The present invention comprises an inner cutting tool, a cutting tool hinge arm, and a hinge limiting post;

[0032] Figure 13 This invention relates to a separate output box and a buffer platform.

[0033] Figure 14 The connecting pipe and mounting housing of the present invention;

[0034] Figure 15 This invention relates to a connecting pipe and a drainage channel;

[0035] Figure 16 This is a schematic diagram of the internal drainage channel of the present invention.

[0036] In the diagram: 1. Device base; 11. Mounting housing; 12. Buffer platform; 2. Clamping mounting arm; 21. Pipe clamp; 3. Air inlet switching channel; 31. Input fan; 32. Lifting channel; 321. Dual input slots; 322. Air inlet slot; 33. Inner pipe; 331. Inner input slot; 332. Inner baffle; 333. Inner output slot; 34. Lifting cylinder; 4. Coaxial impeller; 41. Inner impeller; 411. Inner drive shaft; 412. Shaft air slot; 42. Outer impeller; 421. Outer drive shaft; 422. 5. External mounting base; 5. External cutting tool; 51. Tool holder; 52. Adjusting screw; 54. Tool mounting base; 55. External tool; 551. Ejection spring; 6. Internal cutting tool; 61. Internal bearing seat; 62. Guide groove; 63. Tool mounting ring; 64. Internal tool; 641. Tool hinge arm; 642. Hinge limiting post; 65. Heating coil; 7. Separation output box; 71. Connecting pipe; 72. Drainage channel; 721. Tightening channel; 722. Diffusion channel; 73. Collection box; 731. Exhaust filter. Detailed Implementation

[0037] 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.

[0038] Please see Figures 1 to 16 The present invention provides a technical solution: a self-cleaning deburring device for processing metal-lined plastic pipes, comprising a device base 1, a mounting shell 11 slidably connected to the top surface of the device base 1, a buffer platform 12 fixedly connected to the top surface of the mounting shell 11, a clamping mounting arm 2 fixedly connected to the outer surface of the device base 1, a pipe clamp 21 fixedly connected to the outer surface of the clamping mounting arm 2, an air inlet switching channel 3 provided on the outer surface of the device base 1, a coaxial impeller 4 provided on the inner surface of the mounting shell 11, an outer cutting blade 5 provided on the outer surface of the coaxial impeller 4, an inner cutting blade 6 fixedly connected to one end of the coaxial impeller 4, and a separation output box 7 provided on the outer surface of the buffer platform 12.

[0039] The air inlet switching channel 3 includes an input fan 31, which is fixedly connected to the outer surface of the device base 1. A lifting channel 32 is slidably connected to the inner surface of the device base 1. A double input slot 321 is fixedly connected to the inner surface of the lifting channel 32. An air inlet slot 322 is opened on the outer surface of the mounting housing 11. An inner pipe 33 is slidably connected to the inner surface of the lifting channel 32. An inner input slot 331 is opened on the outer surface of the inner pipe 33. An inner baffle 332 is fixedly connected to the outer surface of the inner pipe 33. An inner output slot 333 is opened on the outer surface of the inner pipe 33. A lifting cylinder 34 is fixedly connected to the outer surface of the device base 1.

[0040] The output end of the input fan 31 extends through to the inner surface of the device base 1. The top surface of the lifting channel 32 is fixedly connected to the mounting housing 11. One end of the inner pipe 33 is closed. There are three lifting cylinders 34 arranged in a ring. The output end of the lifting cylinder 34 is fixedly connected to the mounting housing 11.

[0041] The coaxial impeller 4 includes an inner impeller 41, which is rotatably connected to the inner surface of the mounting housing 11. An inner drive shaft 411 is fixedly connected to the inner surface of the inner impeller 41. A shaft air groove 412 is opened on the outer surface of the inner drive shaft 411. An outer impeller 42 is rotatably connected to the end of the mounting housing 11 away from the inner impeller 41. An outer drive shaft 421 is fixedly connected to the inner surface of the outer impeller 42. An outer mounting base 422 is fixedly connected to the outer surface of the outer drive shaft 421.

[0042] The inner drive shaft 411 is a cylindrical tube, and the inner drive shaft 411 is slidably connected to the inner surface of the outer drive shaft 421. The inner impeller 41 and the outer impeller 42 rotate in opposite directions, and the inner surface of the inner drive shaft 411 is slidably connected to the inner pipe 33.

[0043] Through the combined action of the air inlet switching channel 3 and the coaxial impeller 4, during use, the input fan 31 inputs airflow into the device base 1 and the lifting channel 32. In the default state, the lifting cylinder 34 lifts the lifting channel 32 and the mounting housing 11 upwards. At this time, the outer cutting blade 5 and the inner cutting blade 6 come into contact with the clamped pipe.

[0044] After the lifting channel 32 is raised, the inner pipe 33 will not be raised along with the lifting channel 32 since the inner pipe 33 is not fixedly connected to the lifting channel 32. The double input slot 321 will rise with the lifting channel 32, and the double input slot 321 will block the inner output slot 333 on the inner pipe 33. Since one end of the inner pipe 33 is closed, the top inner output slot 333 cannot output airflow after being blocked. All the airflow input by the input fan 31 enters the mounting housing 11 from the outer ring of the double input slot 321 through the air inlet slot 322, and passes through the inner impeller 41 and the outer impeller 42.

[0045] The inner impeller 41 and the outer impeller 42 will rotate due to the influence of the airflow. Since the impeller arc surfaces of the inner impeller 41 and the outer impeller 42 are in opposite directions, but the airflow direction is unidirectional, the aerodynamic torques on the inner impeller 41 and the outer impeller 42 are in opposite directions, so the inner impeller 41 and the outer impeller 42 rotate in opposite directions.

[0046] Meanwhile, as the airflow passes through the inner impeller 41 and the outer impeller 42 in sequence, the airflow will do work on the two impellers in sequence, and the energy will be lost with distance. The inner impeller 41 receives the airflow before the outer impeller 42, so the rotation speed of the inner impeller 4 will be faster than that of the outer impeller 42.

[0047] The inner impeller 41 and the outer impeller 42 drive the inner drive shaft 411 and the outer drive shaft 421 to rotate respectively. The outer drive shaft 421 is sleeved outside the inner drive shaft 411 and has a shorter axial dimension. It is directly connected to the outer mounting base 422 to control the rotation of the outer cutting tool 5. The inner drive shaft 411 extends out from the outer drive shaft 421 and drives the inner cutting tool 6 to rotate, thereby controlling the rotation of the cutting tools in opposite directions. The speed of the outer cutting tool 5 will be lower than the speed of the inner cutting tool 6.

[0048] The opposite rotation of the two tools during the cutting process counteracts the axial force and reduces the elliptical deformation of the pipe opening.

[0049] By using different rotation speeds, the heating rate of the outer metal during the cutting process is reduced, and the radial force is reduced so that the plastic can adapt. At the same time, the plastic chips are light and are thrown off in time by high centrifugation; the metal chips are heavy and can reliably slide off by gravity at low speed, without bringing the hot molten plastic to the tip of the cutter to melt and accumulate again.

[0050] After the cutting is completed, the lifting cylinder 34 moves the lifting channel 32 and the mounting housing 11 downwards, the outer cutting blade 5 and the inner cutting blade 6 disengage from the clamped pipe, and at the same time, since the position of the inner pipe 33 remains unchanged, after the double input groove 321 descends, the outer ring hole will be blocked by the inner baffle 332 outside the inner pipe 33, the airflow will no longer enter the interior of the mounting housing 11, and both the inner impeller 41 and the outer impeller 42 will stop rotating.

[0051] Meanwhile, as the dual input slots 321 descend, the previously blocked inner output slots 333 are exposed. Airflow enters the inner drive shaft 411 through the inner input slots 331 and the inner output slots 333, and exits from the shaft air slots 412. The internal plastic liner is affected by the ambient temperature air and shrinks.

[0052] The external cutting tool 5 includes a tool holder 51, which is slidably connected to the inner surface of the external mounting base 422. An adjusting screw 52 is threadedly connected to the inner surface of the tool holder 51. A tool mounting base 54 is fixedly connected to the top surface of the tool holder 51. An external tool 55 is slidably connected to the inner surface of the tool mounting base 54. One end of the external tool 55 is fixedly connected to an ejector spring 551.

[0053] There are two tool holders 51, which are symmetrically distributed. The adjusting screw 52 is rotatably connected to the inner surface of the outer mounting base 422, and the other end of the ejector spring 551 is fixedly connected to the inner surface of the tool mounting base 54.

[0054] The internal cutting tool 6 includes an internal support 61, which is fixedly connected to the outer surface of the internal drive shaft 411. A guide groove 62 is provided on the outer surface of the internal support 61. A tool mounting ring 63 is fixedly connected to the outer surface of the internal support 61. An internal tool 64 is slidably connected to the inner surface of the tool mounting ring 63. One end of the internal tool 64 is hinged to a tool hinge arm 641. A hinge limit post 642 is slidably connected to the inner surface of the tool hinge arm 641. A heating coil 65 is fixedly connected to the outer surface of the tool mounting ring 63.

[0055] The guide groove 62 is distributed in a ring on the outer surface of the inner bearing seat 61. There are two inner cutters 64 and they are symmetrically distributed. Both ends of the cutter hinge arm 641 are hinged to the inner cutter 64. The hinge limit post 642 is slidably connected to the inner surface of the cutter mounting ring 63.

[0056] By setting the external cutting tool 5 and the internal cutting tool 6, during use;

[0057] When cutting or chamfering, the thermal expansion coefficients and cutting properties of metal and plastic are different, which can easily produce composite burrs, and traditional deburring methods cannot take into account both.

[0058] The outer cutting tool 5 and the inner cutting tool 6 respectively cut the metal outer shell and the plastic inner lining of the pipe;

[0059] The external cutting tool 5 first forms a threaded drive with the tool holder 51 through the adjusting screw 52, ​​adjusting the distance between the external cutting tool 55 on the tool holder 51 and the metal shell of the pipe;

[0060] Before processing, at room temperature, the inner diameter of the plastic liner is slightly smaller than the outer diameter of the tube and can be easily inserted. The inner cutting tool 6 extends into the plastic liner so that the inner tool 64 makes contact.

[0061] The heating coil 65 is activated, and the temperature rises rapidly. The plastic expands more than the metal, and the inner diameter shrinks, forming a uniform and tight fit. At the same time, the plastic melted edge burrs that "stick to the pipe opening" due to heat softening during the cutting process are squeezed outward and exposed, so that they can be removed in one go by the subsequent blade.

[0062] The outer cutter 55 rotates with the outer impeller 42 at a slower speed than the inner impeller 41. The outer cutter 55 is pushed out of the cutter mounting seat 54 by the ejector spring 551 and contacts the metal shell of the pipe to cut the metal burrs. During the cutting process, as the thickness of the metal shell of the pipe decreases, the outer cutter 55 is gradually pushed outward until it cuts from the metal layer into the plastic layer. At this point, the outer cutter 55 is disengaged from the cutter mounting seat 54 and is only connected by the ejector spring 551. The cutting force drops sharply, realizing "force-controlled layer switching" and avoiding the plastic being scratched by the metal cutter.

[0063] During the cutting process, the inner cutting tool 64 can move laterally inside the inner support 61. Since it is connected to the tool hinge arm 641, and the tool hinge arm 641 is restricted by the hinge limit post 642 to only move vertically, the distance that the inner tools 64 on both sides extend outward is symmetrical with respect to the hinge limit post 642. The tool hinge arm 641 descends under its own weight and pulls the inner tools 64 on both sides inward. In the initial state, the inner tool 64 can easily extend into the plastic liner.

[0064] The inner bearing seat 61 rotates with the inner impeller 41 and rotates faster than the outer impeller 42, thereby cutting the burrs on the plastic liner. Due to the high rotation speed, the inner tool 64 can be thrown outward to contact the plastic liner, which has self-adaptability.

[0065] After the cutting is completed, both the outer cutting tool 5 and the inner cutting tool 6 stop rotating. The tool hinge arm 641 descends under its own weight and pulls the inner tools 64 on both sides inward. The inner tools 64 retract, and at the same time, the airflow from the input fan 31 is output from the shaft air groove 412, causing the plastic liner to shrink and cool.

[0066] The separate output box 7 includes a connecting pipe 71, which is fixedly connected to the outer surface of the buffer platform 12. A flow channel 72 is fixedly connected to the outer surface of the connecting pipe 71. A tightening channel 721 is fixedly connected to the inner surface of the flow channel 72. A diffusion channel 722 is fixedly connected to the bottom surface of the tightening channel 721. A collection box 73 is fixedly connected to the other end of the connecting pipe 71. An exhaust filter 731 is fixedly connected to the outer surface of the collection box 73.

[0067] The connecting pipe 71 extends through to the inner surface of the mounting housing 11. There are three connecting pipes 71 arranged in a ring. The exhaust filter 731 is located on the upper outer side of the collection box 73.

[0068] By separating the output box 7, during use, when the outer cutting tool 5 and the inner cutting tool 6 rotate to cut, the airflow passes through the two impellers inside the mounting housing 11 and is output to the outside through the connecting pipe 71. Although the airflow intensity decreases at this time, the cross-sectional size of the tightening channel 721 inside the connecting pipe 71 gradually decreases, which has an acceleration effect.

[0069] The airflow enters the collection box 73 again through the connecting pipe 71 and the diversion channel 72, and is output through the exhaust filter 731;

[0070] When the airflow passes through the flow channel 72, the high flow rate generates air pressure that sucks in the plastic debris temporarily left on the buffer platform 12 and temporarily stores it inside the collection box 73. Meanwhile, the metal debris has a higher density and is difficult to be sucked up, remaining on the surface of the buffer platform 12. This achieves separation of the two materials and prevents the plastic slag from wrapping the metal debris and forming "secondary burrs".

[0071] The diffusion channel 722 at the bottom of the tightening channel 721 extends the effective area by setting multiple expansion sections behind the throat and setting multiple "funnel mouths" in series, and the adsorption range is increased after being superimposed.

[0072] At the same time, the high-speed airflow carries away some of the heat and provides initial cooling to the surface of the metal shavings.

[0073] In this embodiment, as Figure 1 , Figure 2 As shown, the device base 1 and the mounting housing 11 are used to install components inside, and the pipe clamp 21 clamps the pipe and aligns the cutting area at the bottom for deburring.

[0074] In this embodiment, as Figure 3 As shown, the input fan 31 inputs airflow into the device base 1 and the lifting channel 32. Depending on the position of the inner baffle 332, the airflow is sent into the mounting housing 11 to drive the impeller, or sent into the inner drive shaft 411 for cooling.

[0075] In this embodiment, as Figure 4 , Figure 5 As shown, the inner impeller 41 and the outer impeller 42 are rotatably connected to both ends of the mounting housing 11, and the inner drive shaft 411 and the outer drive shaft 421 rotate inside and outside respectively, driving the outer cutting tool 5 and the inner cutting tool 6 respectively.

[0076] In this embodiment, as Figure 6 As shown, depending on the position of the inner baffle 332, the airflow is output from the inner pipe 33 or from the outer ring of the dual input slot 321;

[0077] In this embodiment, as Figure 7 As shown, the outer drive shaft 421 is sleeved outside the inner drive shaft 411 and has a shorter axial dimension. It is directly connected to the outer mounting base 422 to control the rotation of the outer cutting tool 5.

[0078] In this embodiment, as Figure 8 , Figure 9 , Figure 10 As shown, the outer cutting tool 5 cuts the outside of the pipe, and self-adaptation is achieved by adjusting the position of the outer cutting tool 55;

[0079] In this embodiment, as Figure 11 , Figure 12 As shown, the internal cutting tool 6 cuts the plastic lining of the pipe and retracts due to its own weight.

[0080] In this embodiment, as Figure 13 , Figure 14 , Figure 15 , Figure 16 As shown, the air pressure generated when the airflow passes through quickly sucks in the plastic debris temporarily left on the buffer platform 12 and temporarily stores it inside the collection box 73.

[0081] The invention's usage and advantages: A self-cleaning deburring device for processing metal-lined plastic pipes, the working process of which is as follows:

[0082] like Figures 1 to 16 As shown, during use, the pipe clamp 21 fixes the pipe; the input fan 31 is started, and the lifting cylinder 34 lifts the lifting channel 32, the mounting shell 11, and the buffer platform 12 as a whole, so that the outer cutting blade 5 and the inner cutting blade 6 are close to the pipe opening; the airflow enters the mounting shell 11 through the double input slot 321 and the air inlet slot 322, driving the inner impeller 41 (high speed) and the outer impeller 42 (low speed) to rotate in opposite directions with a clear difference in speed, ready for cutting;

[0083] The outer cutter 55 (low speed) adheres to the metal shell under the action of the ejector spring 551. When the thickness decreases, it automatically extends outward. The cutting force drops sharply when it cuts into the plastic layer, realizing "force-controlled layer switching". The inner cutter 64 (high speed) retracts first under its own weight. After extending into the plastic liner, the heating coil 65 heats up to 80 ℃. The inner diameter of the plastic shrinks, hugs and squeezes out the melt edge burrs. Then it is thrown out by high speed and adheres to the inner wall, completing the plastic chamfering.

[0084] After cutting, the lifting cylinder 34 descends: the double input slot 321 is closed by the inner baffle 332, and the inner impeller 41 and the outer impeller 42 stop rotating; the inner output slot 333 is exposed, and the airflow switches through the inner input slot 331, the inner output slot 333, and the axial air slot 412 to blow directly onto the plastic liner, causing it to cool and relax, making it easier to retract the tool.

[0085] The residual airflow enters the collection box 73 through the connecting pipe 71 and the diversion channel 72. Plastic debris is sucked in by the accelerated airflow and temporarily stored in the collection box 73. Metal debris, due to its high density, remains on the buffer platform 12, achieving separation of the two materials. At the same time, the high-speed airflow cools the metal debris, completing self-cleaning.

[0086] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-cleaning deburring device for processing metal-lined plastic pipes, comprising a device base (1), wherein a mounting shell (11) is slidably connected to the top surface of the device base (1), a buffer platform (12) is fixedly connected to the top surface of the mounting shell (11), the buffer platform (12) is used to temporarily support chips, a clamping mounting arm (2) is fixedly connected to the outer surface of the device base (1), and a pipe clamp (21) is fixedly connected to the outer surface of the clamping mounting arm (2), the pipe clamp (21) is used to position the pipe, characterized in that: The outer surface of the device base (1) is provided with an air inlet switching channel (3) for providing and switching airflow paths. The inner surface of the mounting housing (11) is provided with a coaxial impeller (4) for converting airflow kinetic energy into rotational power. The outer surface of the coaxial impeller (4) is provided with an outer cutting blade (5) for cutting metal burrs at low speed. One end of the coaxial impeller (4) is fixedly connected with an inner cutting blade (6) for removing plastic burrs at high speed. The outer surface of the buffer platform (12) is provided with a separation output box (7) for separating and collecting chips of different densities.

2. The self-cleaning deburring device for processing metal-lined plastic pipes according to claim 1, characterized in that: The air inlet switching channel (3) includes an input fan (31), a lifting channel (32), a double input slot (321), and an air inlet slot (322). The input fan (31) is connected to the device base (1). The lifting channel (32) is slidably disposed in the device base (1) and is used to drive the mounting shell (11) to rise and fall. The double input slot (321) is disposed in the lifting channel (32) and is used to switch the airflow direction. The air inlet slot (322) is disposed on the mounting shell (11) and is used to introduce airflow to the coaxial impeller (4).

3. The self-cleaning deburring device for processing metal-lined plastic pipes according to claim 2, characterized in that: The lifting channel (32) is provided with an inner pipe (33), the inner pipe (33) is provided with an inner input groove (331), an inner baffle (332) and an inner output groove (333), the inner baffle (332) is used to control the opening and closing of the airflow channel, the inner output groove (333) is used to output the cold compressed airflow, and the device base (1) is provided with a lifting cylinder (34) for driving the lifting channel (32) to rise and fall.

4. The self-cleaning deburring device for processing metal-lined plastic pipes according to claim 3, characterized in that: The coaxial impeller (4) includes an inner impeller (41) and an inner drive shaft (411). The inner impeller (41) is rotatably disposed inside the mounting housing (11). The inner drive shaft (411) is connected to the inner impeller (41). The inner drive shaft (411) is provided with a shaft air groove (412) for outputting cold compressed airflow.

5. The self-cleaning deburring device for processing metal-lined plastic pipes according to claim 4, characterized in that: The mounting housing (11) is also provided with an outer impeller (42), the outer impeller (42) is connected to an outer drive shaft (421), and the outer drive shaft (421) is provided with an outer mounting seat (422) for mounting an outer cutting tool (5).

6. The self-cleaning deburring device for processing metal-lined plastic pipes according to claim 5, characterized in that: The external cutting tool (5) includes a tool holder (51), an adjusting screw (52), a tool mounting base (54), and an external cutting tool (55). The tool holder (51) is slidably disposed in the external mounting base (422). The adjusting screw (52) is used to adjust the position of the tool holder (51). The external cutting tool (55) is slidably disposed in the tool mounting base (54) and is provided with an ejector spring (551) for controlling the cutting force.

7. A self-cleaning deburring device for processing metal-lined plastic pipes according to claim 6, characterized in that: The inner cutting tool (6) includes an inner support (61), a tool mounting ring (63), and an inner tool (64). The inner support (61) is connected to the inner drive shaft (411) and is provided with a guide groove (62) for guiding the cooling airflow. The inner tool (64) is slidably disposed in the tool mounting ring (63) and is connected with a tool hinge arm (641) and a hinge limit post (642) for controlling the extension and retraction of the tool. The tool mounting ring (63) is provided with a heating coil (65) for heating the plastic liner.

8. The self-cleaning deburring device for processing metal-lined plastic pipes according to claim 7, characterized in that: The separation output box (7) includes a connecting pipe (71), a drainage channel (72), and a collection box (73). The connecting pipe (71) is connected to the buffer platform (12). The drainage channel (72) is used to form a negative pressure to suck up debris. A tightening channel (721) is fixedly connected to the inner surface of the drainage channel (72). A diffusion channel (722) is fixedly connected to the bottom surface of the tightening channel (721). The collection box (73) is connected to the end of the connecting pipe (71) and is provided with an exhaust filter (731) for filtering and collecting plastic debris.

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