Three-chuck zero-tailing pipe cutting machine

Abstract

The invention discloses a three-chuck zero-tailing pipe cutting machine, and relates to the technical field of pipe machining equipment, the three-chuck zero-tailing pipe cutting machine comprises a rack and a middle chuck, the middle chuck is located on the rack, the middle chuck comprises two sets of first clamping jaws and two sets of second clamping jaws, the top of each set of first clamping jaws is fixedly connected with a protection block, and a first air cylinder is arranged in each protection block; three sets of driving wedge blocks are fixed to the inner side of the first air cylinder, each set of driving wedge blocks are horizontally arranged in the vertical direction of the axis of the first air cylinder, one side of each set of driving wedge blocks is in contact connection with a driven wedge block, the inclined face of each driven wedge block is matched with the inclined face of the corresponding driving wedge block, and a pressurizing clamping jaw is fixed to one side of each driven wedge block. An air inlet pipe and an exhaust pipe are arranged on the outer side of the first air cylinder, a baffle is connected to the outer side of the protection block through bolts, the air inlet pipe and the exhaust pipe penetrate through the baffle, and through holes are formed in the two ends of the protection block.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe processing equipment, in particular to a three-chuck zero tail pipe cutting machine. BACKGROUND

[0002] In the pipe processing industry, pipe cutting machines are commonly used equipment, and the core purpose is to efficiently and accurately cut tubular materials into the required length. Most of the pipe cutting machines on the market currently use single-chuck or double-chuck structures, which have two major core defects in the process of clamping and cutting the pipe: insufficient clamping force leading to precision deviation, and serious waste of tail material. On the one hand, the clamping mechanism of traditional pipe cutting machines usually adopts a direct clamping method, and the clamping force is limited. When processing thicker or higher hardness pipes, the pipe may slip during cutting, which not only affects the cutting accuracy, resulting in a large deviation in the length of the cut pipe, but also may damage the cutting tool, increasing production costs. On the other hand, due to the lack of an effective pulling mechanism, the existing pipe cutting machines often leave a long tail at the end of the pipe during the cutting process. These tail materials are difficult to reuse, causing serious waste of raw materials, especially for some valuable pipe materials, which greatly increases the production cost of enterprises. In addition, the processing of tail materials also requires additional manpower and time, reducing the overall production efficiency.

[0003] Therefore, it is necessary to design a three-chuck zero tail pipe cutting machine with high practicability and precision. SUMMARY

[0004] The present application aims to provide a three-chuck zero tail pipe cutting machine to solve the problems raised in the background.

[0005] To solve the above technical problems, the present application provides the following technical solution: a three-chuck zero tail pipe cutting machine, comprising a rack and a middle chuck, the middle chuck being located on the rack, the middle chuck comprising two groups of first clamping jaws and two groups of second clamping jaws, each group of first clamping jaws being fixedly connected at the top with a protection block, the protection block being internally provided with a cylinder one, the cylinder one being fixedly provided on the inner side with three groups of driving wedges, each group of driving wedges being horizontally arranged along the vertical direction of the cylinder one axis, each group of driving wedges being contactingly connected on one side with a driven wedge, the inclined surface of the driven wedge being adapted to the inclined surface of the driving wedge, the driven wedge being fixedly provided on one side with a booster clamping jaw.

[0006] According to the above technical solution, the top of the push rod of the cylinder one is fixedly provided with a push block, the push block is bolted with the protection block, the outer side of the cylinder one is provided with an air inlet pipe and an air outlet pipe, the outer side of the protection block is bolted with a baffle, the air inlet pipe and the air outlet pipe penetrate the baffle, the both ends of the protection block are provided with through holes, the inside of the through holes is provided with a rod sleeve, the inside of the rod sleeve is contactingly connected with a stop rod, the top of the stop rod is bolted with the booster clamping jaw.

[0007] According to the technical scheme, the bottom of each group of first clamping jaws is fixedly connected with a sliding block one, both sides of the sliding block one are slidably connected with a fixed plate one, the top of the fixed plate one is fixedly connected with a laser displacement sensor, the bottom of the fixed plate one is boltedly connected with a disc body, the bottom of the sliding block one is slidably connected with the disc body, the bottom of each group of second clamping jaws is fixedly connected with a sliding block two, both sides of the sliding block two are slidably connected with a fixed plate two, the bottom of the fixed plate two is boltedly connected with the disc body, and the bottom of the sliding block two is slidably connected with the disc body.

[0008] According to the technical scheme, a plurality of groups of gear holes are formed in the top of the disc body, two groups of gear sleeves one and two groups of gear sleeves two are boltedly connected to the back of the disc body, each group of gear sleeves one and two corresponds to one gear hole, a circular table is fixed to the back of the disc body, and two groups of fixed columns one and two are fixedly connected to the back of the disc body, and one end of each of the fixed columns one and two is boltedly connected with a back plate.

[0009] According to the technical scheme, a plurality of groups of gear holes are formed in the top of the disc body, two groups of gear sleeves one and two groups of gear sleeves two are boltedly connected to the back of the disc body, each group of gear sleeves one and two corresponds to one gear hole, a circular table is fixed to the back of the disc body, and two groups of fixed columns one and two are fixedly connected to the back of the disc body, and one end of each of the fixed columns one and two is boltedly connected with a back plate.

[0010] According to the technical scheme, a plurality of groups of gear holes are formed in the top of the disc body, two groups of gear sleeves one and two groups of gear sleeves two are boltedly connected to the back of the disc body, each group of gear sleeves one and two corresponds to one gear hole, a circular table is fixed to the back of the disc body, and two groups of fixed columns one and two are fixedly connected to the back of the disc body, and one end of each of the fixed columns one and two is boltedly connected with a back plate.

[0011] According to the technical scheme, a plurality of groups of gear holes are formed in the top of the disc body, two groups of gear sleeves one and two groups of gear sleeves two are boltedly connected to the back of the disc body, each group of gear sleeves one and two corresponds to one gear hole, a circular table is fixed to the back of the disc body, and two groups of fixed columns one and two are fixedly connected to the back of the disc body, and one end of each of the fixed columns one and two is boltedly connected with a back plate.

[0012] According to the technical scheme, a plurality of groups of gear holes are formed in the top of the disc body, two groups of gear sleeves one and two groups of gear sleeves two are boltedly connected to the back of the disc body, each group of gear sleeves one and two corresponds to one gear hole, a circular table is fixed to the back of the disc body, and two groups of fixed columns one and two are fixedly connected to the back of the disc body, and one end of each of the fixed columns one and two is boltedly connected with a back plate.

[0013] According to the technical scheme, a plurality of groups of gear holes are formed in the top of the disc body, two groups of gear sleeves one and two groups of gear sleeves two are boltedly connected to the back of the disc body, each group of gear sleeves one and two corresponds to one gear hole, a circular table is fixed to the back of the disc body, and two groups of fixed columns one and two are fixedly connected to the back of the disc body, and one end of each of the fixed columns one and two is boltedly connected with a back plate.

[0014] According to the technical scheme, the rear chuck and the front chuck are arranged on the rack from left to right, and the middle chuck is arranged between the rear chuck and the front chuck, the middle chuck and the front chuck have the same structure and configuration, and the working chamber is arranged on the rack.

[0015] Compared with the prior art, the present application has the following beneficial effects: the front chuck is provided with the functions of clamping and pulling material, the clamping and pulling material integration is realized, the equipment floor area is reduced, the zero tail material reduces the cost, the laser displacement sensor is arranged, the difference value of the round run-out is detected before each cutting, the cutting precision is improved, and the wedge is arranged to increase the clamping force. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, together with the embodiments of the present application, to explain the present application, and do not constitute a limitation on the present application. In the drawings: Figure 1 It is a schematic diagram of the overall structure of the present application; Figure 2 It is a schematic diagram of the overall structure of the middle chuck of the present application; Figure 3 It is a schematic diagram of the structure of the first claw and the booster claw of the present application; Figure 4 It is a schematic diagram of the internal structure of the booster claw of the present application; Figure 5 It is a schematic diagram of the Figure 4 It is a sectional view at B; Figure 6 It is a schematic diagram of the disc body structure of the present application; Figure 7 It is a schematic diagram of the back structure of the disc body of the present application; Figure 8 It is a schematic diagram of the Figure 6 It is an enlarged schematic diagram at A; Figure 9 It is a schematic diagram of the back connection of the disc body of the present application; Figure 10 It is a schematic diagram of the connection of the second cylinder of the present application; Figure 11 It is a schematic diagram of the connection of the third cylinder of the present application; Figure 12 It is a schematic diagram of the connection of the second driving gear and the second driven gear of the present application; Figure 13 It is a schematic diagram of the overall rear structure of the present application; In the figure: 1, rack; 101, rear chuck; 102, front chuck; 103, operation panel; 104, cutting knife; 105, working chamber; 2, middle chuck; 3, first claw; 301, slider one; 302, fixed plate one; 3021, laser displacement sensor; 4, booster claw; 401, protection block; 4011, through hole; 4012, blocking rod; 4013, rod sleeve; 402, cylinder one; 4021, intake pipe; 4022, exhaust pipe; 403, driving wedge; 404, push block; 405, baffle; 406, driven wedge; 5, second claw; 501, slider two; 5011, rack; 502, fixed plate two; 6, disc body; 601, gear hole; 6011, driven gear one; 6012, driving gear one; 602, gear sleeve one; 603, fixed column one; 604, fixed column two; 605, circular table; 606, gear sleeve two 7, chuck frame; 701, lifting ring one; 702, lifting ring two; 703, square groove; 704, round plate; 705, back plate; 8, cylinder two; 801, rotating block one; 802, fixed block one; 803, connecting rod one; 9, gear ring one; 10, gear ring two; 11, cylinder three; 1101, rotating block two; 1102, fixed block two; 1103, connecting rod two; 12, motor; 1201, driving gear two; 1202, driven gear two; 1203, protective cover. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0018] Please refer to Figures 1-13 The present application provides a technical solution: a three-chuck zero tail pipe cutting machine, comprising a rack 1 and a middle chuck 2, the middle chuck 2 is located on the rack 1, the middle chuck 2 comprises two groups of first claws 3 and two groups of second claws 5, each group of first claws 3 is fixedly connected with a protection block 401 at the top, the protection block 401 is internally provided with a cylinder one 402, the cylinder one 402 is fixedly connected with three groups of driving wedges 403 on the inner side, each group of driving wedges 403 is arranged horizontally along the vertical direction of the axis of the cylinder one 402, each group of driving wedges 403 is connected with a driven wedge 406 on one side, the inclined surface of the driven wedge 406 is matched with the inclined surface of the driving wedge 403 (as Figure 5 shown), the driven wedge 406 is fixedly connected with a booster claw 4 on one side; The push rod top of the cylinder 402 is fixed with a push block 404, the push block 404 is bolted with the protection block 401, the cylinder 402 is provided with an air inlet pipe 4021 and an exhaust pipe 4022 on the outer side, the protection block 401 is bolted with a baffle 405 on the outer side, the air inlet pipe 4021 and the exhaust pipe 4022 penetrate through the baffle 405, the protection block 401 is provided with a through hole 4011 at both ends, the through hole 4011 is provided with a rod sleeve 4013 inside, the rod sleeve 4013 is in contact with a blocking rod 4012 inside, the blocking rod 4012 top is bolted with the boost claw 4; The bottom of each group of first claws 3 is fixedly connected with a sliding block 301, the sliding block 301 is slidably connected with a fixed plate 302 on both sides, the fixed plate 302 top is fixedly connected with a laser displacement sensor 3021, the fixed plate 302 bottom is bolted with a disc body 6, the sliding block 301 bottom is slidably connected with the disc body 6, the bottom of each group of second claws 5 is fixedly connected with a sliding block 501, the sliding block 501 is slidably connected with a fixed plate 502 on both sides, the fixed plate 502 bottom is bolted with the disc body 6, the sliding block 501 bottom is slidably connected with the disc body 6; The disc body 6 top is provided with a plurality of gear holes 601, the disc body 6 back is bolted with two groups of gear sleeves 602 and two groups of gear sleeves 606, each group of gear sleeves 602 and 606 corresponds to one of the gear holes 601, the disc body 6 back is fixed with a circular table 605, the disc body 6 back is fixedly connected with two groups of fixed columns 603 and 604, one end of the fixed column 603 and 604 is bolted with a back plate 705; A plurality of gear holes 601 are internally bearing connected with driven gears 6011 and driving gears 6012, the sliding block 501 one side is fixed with a rack 5011, when the sliding block 501 is in the outermost circle of the disc body 6, the rack 5011 is engaged with the driven gear 6011, the driven gear 6011 top is bearing connected with the fixed plate 502, the driving gear 6012 tooth width is greater than that of the driven gear 6011, the driving gear 6012 bottom is bearing connected with the gear sleeve 602, the driving gear 6012 lower part is engaged with a gear ring 2 10, the gear ring 2 10 is provided with two symmetrical fly ear parts around the outer circle; The back plate 705 bottom is bearing connected with a chuck frame 7, the chuck frame 7 one end is fixedly connected with a lifting ring 701, the chuck frame 7 side is fixed with a lifting ring 702, the back plate 705 top is centrally provided with a square groove 703, the square groove 703 is fixed with a plurality of circular tablets 704, the circular tablet 704 top is in contact with a gear ring 1 9, the gear ring 1 9 is provided with two symmetrical fly ear parts around the outer circle; The fixed column one 603 is connected with rotating block one 801 through bearings, one end of the rotating block one 801 is fixedly connected with air cylinder two 8, the push rod of the air cylinder two 8 is fixedly connected with fixed block one 802, the top of the fixed block one 802 is fixedly connected with connecting rod one 803, the top of the connecting rod one 803 is bolted with the flying ear part of the gear ring one 9, the top of the gear ring one 9 is in contact with the gear ring two 10, the inner rings of the gear ring one 9 and the gear ring two 10 are all in rotation connection with the circular table 605; The fixed column two 604 is connected with rotating block two 1101 through bearings, one end of the rotating block two 1101 is fixedly connected with air cylinder three 11, the push rod of the air cylinder three 11 is fixedly connected with fixed block two 1102, the top of the fixed block two 1102 is fixedly connected with connecting rod two 1103, the top of the connecting rod two 1103 is bolted with the flying ear part of the gear ring two 10; The bottom of the chuck frame 7 is connected with driven gear two 1202 through bearings, the top of the driven gear two 1202 is in meshing with driving gear two 1201, the driving gear two 1201 is keyed with motor 12, one end of the motor 12 is bolted with protective cover 1203, one side of the protective cover 1203 is bolted with the chuck frame 7; The rear chuck 101 and the front chuck 102 are arranged on the rack 1 from left to right, the rear chuck 101 is prior art and is not described herein, the middle chuck 2 is located between the rear chuck 101 and the front chuck 102, the structure and configuration of the middle chuck 2 and the front chuck 102 are the same, the rack 1 is provided with working bin 105, the working bin 105 is fixedly provided with operation panel 103, and the working bin 105 is internally provided with cutting knife 104, the cutting knife 104 can be a hard alloy cutter, which is prior art and is not described herein.

[0019] Working principle: when the workpiece needs to be clamped, air is supplied to the air cylinder two 8 and the air cylinder three 11, the push rods on the air cylinder two 8 and the air cylinder three 11 push the fixed block one 802 and the fixed block two 1102 to move away from the air cylinder two 8 and the air cylinder three 11, so that the rotating block one 801 and the rotating block two 1101 rotate around the axis of the fixed column one 603 and the fixed column two 604, drive the air cylinder two 8 and the air cylinder three 11 to rotate along the axis of the back plate 705, further drive the gear ring one 9 and the gear ring two 10 to rotate along their own axes, so that the driving gear one 6012 in meshing with them rotates, the rotation of the driving gear one 6012 drives the driven gear one 6011 to rotate, the rotation of the driven gear one 6011 drives the sliding block one 301 and the sliding block two 501 to move to the center axis of the disc body 6, so as to realize clamping and clamping of the steel pipe.

[0020] When the clamping force needs to be increased, the air inlet pipe 4021 is ventilated, and since the push block 404 is fixed, the push rod fixed on the push block 404 drives the air cylinder one 402 to move towards the push block 404, the movement of the air cylinder one 402 drives the three sets of driving wedge blocks 403 to move parallel to the air cylinder one 402, the driven wedge block 406 decomposes the force from the driving wedge block 403 into a force parallel to the air cylinder one 402 and a force perpendicular to the air cylinder one 402, the stop rod 4012 limits the force parallel to the air cylinder one 402 of the pressurizing claw 4, only the force perpendicular to the air cylinder one 402 is left, which promotes the pressurizing claw 4 to move in the vertical direction of the air cylinder one 402, so that the driving wedge block 403 increases the clamping force of the pressurizing claw 4.

[0021] A method for using a three-chuck zero tail pipe cutting machine, comprising the following steps: First, set the pre-tightening force in the operation system according to the material, wall thickness and diameter of the steel pipe, manually place the steel pipe to be cut into the rear chuck 101 and clamp it, and then send it to the middle chuck 2 for clamping, the two chucks clamp the steel pipe together, at this time the cutting knife 104 is between the middle chuck 2 and the front chuck 102, before cutting, drive the motor 12 to make the middle chuck 2 rotate one circle with the steel pipe, and the laser displacement sensor 3021 detects whether the round runout error is generated, in the case that all other conditions are met, the causes of the round runout error are divided into two categories: the horizontal centers of the three chucks are inconsistent and there is rust on the surface of the steel pipe, if no round runout error is generated, directly cut, if the round runout error is generated, first judge whether it is caused by the rust on the surface of the steel pipe, loosen the middle chuck 2, advance the rear chuck 101 with the steel pipe for a distance, clamp the middle chuck 2 again and then rotate one circle, and then measure whether the error is generated by the laser displacement sensor 3021, if no error is generated, it is judged that the round runout error is caused by the rust on the surface of the steel pipe, if the error is generated, it is judged that the round runout error is caused by the inconsistent horizontal centers of the chucks, first remove the steel pipe, replace it with a high-precision and length-adjustable center shaft that can be clamped by the three chucks, slowly rotate the three chucks, and then measure the radial runout error near the three chucks by using the dial gauge, adjust the height of the three chucks until the three centers overlap, and then cut the steel pipe.

[0022] Second step, when the first cutting is finished, the front chuck 102 retreats to the end of cutting clamping, the middle chuck 2 releases the steel pipe, the cutting knife 104 moves up, the rear chuck 101 and the front chuck 102 clamp the steel pipe and move forward together with the middle chuck 2, the middle chuck 2 stops moving when moving to the front of the cutting knife 104, the rear chuck 101 and the front chuck 102 clamp the steel pipe and continue to move until the appropriate position, at this time the end of the steel pipe which needs to be cut is located behind the middle chuck 2, the middle chuck 2 clamps the steel pipe, and the middle chuck 2 rotates a circle with the steel pipe before cutting, the laser displacement sensor 3021 detects whether the round runout error is generated, the causes of the error generated this time are two categories, which are the impurities such as residual debris of the claw and the rust on the surface of the steel pipe, first, the rear chuck 101 is moved to one end of the steel pipe and clamped, the middle chuck 2 releases the steel pipe, then the claw is manually wiped clean, the middle chuck 2 clamps the steel pipe again, the rear chuck 101 is released back to the original position, and the round runout error is detected again, if no error is generated, it is judged that the impurities remaining in the claw affect the precision, if the error is still generated, it is judged that the rust on the surface of the steel pipe generates the error, then the clamping position of the middle chuck 2 is switched until no error is generated before the cutting continues.

[0023] It should be noted that the relative terms, such as first and second, and the like are used herein solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0024] Finally, it should be noted that: the above only describes the preferred embodiments of the present application, and is not used to limit the present application, although the foregoing embodiments of the present application are described in detail, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A three-chuck zero tail pipe cutting machine comprising a frame (1) and a middle chuck (2), characterized in that, The middle chuck (2) is located on the rack (1), the middle chuck (2) includes two groups of first clamping jaws (3) and two groups of second clamping jaws (5), the top of each group of first clamping jaws (3) is fixedly connected with a protection block (401), the inside of the protection block (401) is provided with a cylinder one (402), the inner side of the cylinder one (402) is fixedly connected with three groups of driving wedge blocks (403), each group of driving wedge blocks (403) is arranged horizontally along the vertical direction of the cylinder one (402) axis, one side of each group of driving wedge blocks (403) is connected with a driven wedge block (406), the inclined surface of the driven wedge block (406) is matched with the inclined surface of the driving wedge block (403), one side of the driven wedge block (406) is fixedly connected with a booster clamping jaw (4).

2. The three-chuck zero-scraps pipe cutting machine according to claim 1, characterized in that, The top of the push rod of the cylinder one (402) is fixedly connected with a push block (404), the push block (404) is bolted with the protection block (401), the outer side of the cylinder one (402) is provided with an air inlet pipe (4021) and an exhaust pipe (4022), the outer side of the protection block (401) is bolted with a baffle (405), the air inlet pipe (4021) and the exhaust pipe (4022) penetrate through the baffle (405), the both ends of the protection block (401) are provided with through holes (4011), the inside of the through hole (4011) is provided with a rod sleeve (4013), the inside of the rod sleeve (4013) is connected with a stop rod (4012), the top of the stop rod (4012) is bolted with the booster clamping jaw (4).

3. The three-chuck zero-scraps pipe cutting machine of claim 2, wherein, The bottom of each group of first clamping jaws (3) is fixedly connected with a sliding block one (301), the both sides of the sliding block one (301) are slidably connected with a fixed plate one (302), the top of the fixed plate one (302) is fixedly connected with a laser displacement sensor (3021), the bottom of the fixed plate one (302) is bolted with a disc body (6), the bottom of the sliding block one (301) is slidably connected with the disc body (6), the bottom of each group of second clamping jaws (5) is fixedly connected with a sliding block two (501), the both sides of the sliding block two (501) are slidably connected with a fixed plate two (502), the bottom of the fixed plate two (502) is bolted with the disc body (6), the bottom of the sliding block two (501) is slidably connected with the disc body (6).

4. The three-chuck zero-scraps pipe cutting machine of claim 3, wherein, The top of the disc body (6) is provided with a plurality of gear holes (601), the back of the disc body (6) is bolted with two groups of gear sleeve one (602) and two groups of gear sleeve two (606), each group of gear sleeve one (602) and gear sleeve two (606) corresponds to one of the gear holes (601), the back of the disc body (6) is fixedly connected with a circular table (605), the back of the disc body (6) is fixedly connected with two groups of fixed columns one (603) and two groups of fixed columns two (604), one end of the fixed column one (603) and the fixed column two (604) is bolted with a back plate (705).

5. The three-chuck zero-scraps tube cutting machine of claim 4, wherein, A plurality of gear holes (601) inside the bearing connected with driven gear one (6011) and driving gear one (6012), the slider two (501) side fixed with rack (5011), when the slider two (501) in the outermost circle of the disc body (6), the rack (5011) with driven gear one (6011) mesh, the top of driven gear one (6011) with fixed plate two (502) bearing connection, the gear width of driving gear one (6012) is greater than the gear width of driven gear one (6011), the bottom of driving gear one (6012) and gear cover one (602) are bearing connected, the lower part of driving gear one (6012) is engaged with gear ring two (10), the gear ring two (10) is provided with two symmetrical flying ear parts around the outer circle.

6. The three-chuck zero-scraps tube cutting machine of claim 5, wherein, The bottom of the back plate (705) is bearing connected with chuck frame (7), one end of the chuck frame (7) is fixedly connected with lifting ring one (701), the side of the chuck frame (7) is fixedly connected with lifting ring two (702), the top of the back plate (705) is provided with square groove (703) in the center, a plurality of round tablets (704) are fixedly connected around the square groove (703), the top of the round tablet (704) is contact connected with gear ring one (9), the gear ring one (9) is provided with two symmetrical flying ear parts around the outer circle.

7. The three-chuck zero-scraps tube cutting machine of claim 6, wherein, The circumference of the fixed column one (603) is bearing connected with rotating block one (801), one end of the rotating block one (801) is fixedly connected with air cylinder two (8), the push rod of the air cylinder two (8) is fixedly connected with fixed block one (802), the top of the fixed block one (802) is fixedly connected with connecting rod one (803), the top of the connecting rod one (803) is bolted with the flying ear part of the gear ring one (9), the top of the gear ring one (9) is in contact with the gear ring two (10), the inner circle of the gear ring one (9) and the gear ring two (10) are rotatably connected with the circular table (605).

8. The three-chuck zero-scraps tube cutting machine of claim 7, wherein, The circumference of the fixed column two (604) is bearing connected with rotating block two (1101), one end of the rotating block two (1101) is fixedly connected with air cylinder three (11), the push rod of the air cylinder three (11) is fixedly connected with fixed block two (1102), the top of the fixed block two (1102) is fixedly connected with connecting rod two (1103), the top of the connecting rod two (1103) is bolted with the flying ear part of the gear ring two (10).

9. The three-chuck zero-scraps tube cutting machine of claim 8, wherein, The bottom of the chuck frame (7) is bearing connected with driven gear two (1202), the top of the driven gear two (1202) is engaged with driving gear two (1201), the driving gear two (1201) is key connected with motor (12), one end of the motor (12) is bolted with protective cover (1203), one side of the protective cover (1203) is bolted with the chuck frame (7).

10. The three-chuck zero-scraps tube cutting machine of claim 9, wherein, The rack (1) is respectively provided with a rear chuck (101) and a front chuck (102) from left to right, the middle chuck (2) is located between the rear chuck (101) and the front chuck (102), the structure and configuration of the middle chuck (2) and the front chuck (102) are same, the rack (1) is provided with a working bin (105), the working bin (105) is fixed with an operation panel (103), and the working bin (105) is internally provided with a cutting knife (104).

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