An automatic loading and unloading pipe thread lathe

Abstract

The invention discloses an automatic loading and unloading pipe thread lathe in the technical field of thread lathe machines, comprising a frame, a cutting telescopic rod is installed at the end of the frame, the movable end of the cutting telescopic rod is fixedly connected with the movable frame, the movable frame is rotatably connected with the cutting assembly, the inner wall of the frame is slidably connected with the clamping rods arranged in a circular array, and the frame is installed with a driving assembly for driving the clamping rods to move towards each other, the clamping rods are all plugged with cross bars, both ends of each cross bar end are fixedly connected with clamping racks, the clamping racks are meshed with speed regulating gear sets rotatably connected to the frame, the speed regulating gear sets are meshed with clamping gears rotatably connected to the frame, the clamping gears are all fixedly connected with feeding rods, and the ends of the feeding rods are rotatably connected with push rods, and the other end of one of the feeding rods is rotatably connected with a pull rod, so that automatic loading and unloading can be realized without adding additional loading and unloading equipment, and at the same time, the moving distance of the turning part or the clamping part is shortened, thereby improving work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of thread lathes, in particular to an automatic loading and unloading pipe thread lathe. Background Art

[0002] Thread lathes refer to thread processing machines for turning threads. Among them, short thread lathes, pipe thread lathes and oil pipe joint thread lathes are mainly used for turning short thread workpieces and threads of oil pipes and casings used in petroleum and geological drilling; precision screw lathes are mainly used for processing precision threads in the machine tool manufacturing industry.

[0003] The existing new type of pipe thread lathe needs to be equipped with loading and unloading equipment for coordinated use, which greatly increases the cost of purchasing turning equipment. In addition, after the existing thread lathe turns the workpiece, the turning part or the clamping part needs to move a long distance to ensure that the turning part and the clamping part have enough distance for loading and unloading. The movement of the turning part or the clamping part greatly increases the turning time and reduces work efficiency. Summary of the invention

[0004] The technical problem of the present invention is to provide an automatic loading and unloading pipe thread lathe, which can realize automatic loading and unloading without adding additional loading and unloading equipment, and at the same time shorten the moving distance of the turning part or the clamping part, thereby improving work efficiency.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: it comprises a frame, a cutting telescopic rod is installed at the end of the frame, a movable end of the cutting telescopic rod is fixedly connected to a movable frame, a cutting assembly is rotatably connected to the inner wall of the frame, clamping rods arranged in a circular array are slidably connected, a driving assembly for driving the clamping rods to move toward each other is installed in the frame, the clamping rods are all plugged with cross bars, both ends of each cross bar end are fixedly connected with clamping racks, the clamping racks are meshed with a speed regulating gear set rotatably connected to the frame, and the speed regulating gear set is meshed with a gear set rotatably connected to the frame. The frame is rotatably connected to a clamping gear, and the clamping gears are fixedly connected to a feeding rod, and the ends of the feeding rods are rotatably connected to push rods, and the other end of one of the feeding rods is rotatably connected to a pull rod, and the pull rod and the push rod are rotatably connected to an L-shaped feeding push block through an axis, and the inner wall of the frame is fixedly connected to a clamping seat arranged in a circular array, and both sides of the clamping seat are fixedly connected to a sliding seat slidably connected to the push block, and a clamping block with a chamfer is slidably connected in the clamping seat, and a clamping spring is fixedly connected between the clamping block and the clamping seat, and the frame is equipped with a conveying assembly.

[0006] As a further solution of the present invention, the conveying assembly includes a transition motor installed on a frame, the output shaft of the transition motor is fixedly connected to a transition turntable, the transition turntable is provided with a feed trough arranged in a circular array, a suction cup is fixedly connected in the feed trough, a feed seat is rotatably connected to the bottom of the transition turntable, a support seat is fixedly connected to the end of the feed seat, and a conveying wheel is rotatably connected in the feed seat.

[0007] As a further solution of the present invention, the support seat includes an outer shell, a supporting telescopic rod is fixedly connected inside the outer shell, a universal wheel is fixedly connected to the movable end of the supporting telescopic rod, a fixed seat is slidably connected to the outer wall of the outer shell, and a limiting assembly is arranged between the fixed seat and the outer shell.

[0008] As a further solution of the present invention, the limit assembly includes a limit pin slidably connected to the fixed seat, a limit spring is fixedly connected between the limit pin and the fixed seat, and the housing is provided with at least two limit holes cooperating with the limit pin.

[0009] As a further solution of the present invention, the driving assembly includes a shift rod rotatably connected to the frame, a connecting rod is rotatably connected between the shift rods, a clamping groove is opened at one end of the shift rod, a clamping shaft is slidably connected in the clamping groove, the frame is rotatably connected to a driving telescopic rod, and the movable end of the driving telescopic rod is rotatably connected to the hinge between the shift rod and the connecting rod.

[0010] As a further solution of the present invention, the cutting assembly includes a cutting turntable rotatably connected to a movable frame, the cutting turntable is equipped with a cutting knife, the cutting turntable is fixedly connected to a driving gear disk, the movable frame is equipped with a cutting motor through a bracket, and the output shaft of the cutting motor is fixedly connected to a cutting gear meshing with the driving gear disk.

[0011] As a further solution of the present invention, the cutting disc is provided with mounting grooves arranged in a circumferential array, the axes of the mounting grooves are at different distances from the axes of the cutting disc, and the mounting grooves are threadedly connected with fixing bolts for fixing the cutting blades;

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. In the present invention, the clamping rods are brought close to each other to prepare for clamping the pipe fittings, and at the same time, the pipe fittings on the conveying assembly are moved between the clamping rods through the cross bar, the clamping rack, the speed regulating gear set, the clamping gear, the feeding rod, the push rod, the pull rod and the feeding push block until the clamping rod clamps the pipe fittings. After the pipe fittings are threaded, the newly-entered pipe fittings push the threaded pipe fittings away from the clamping rods, thereby realizing automatic and continuous loading and unloading. In the above process, there is no need to equip additional loading and unloading equipment for loading and unloading, and automatic and continuous loading and unloading can be realized. At the same time, the cutting assembly only needs to move to separate from the pipe fitting, and there is no need to consider the space required for loading and unloading. The cutting assembly will not interfere with the loading and unloading, which shortens the distance the cutting assembly moves, thereby reducing the time required for the cutting assembly to move, thereby shortening the time for thread turning of the pipe fittings, and improving the efficiency of thread machining of the pipe fittings.

[0014] 2. In the present invention, the pipe fittings are clamped at different positions of the pipe fittings by means of the clamping rod and the clamping block, so as to improve the stability of the pipe fittings during processing, thereby avoiding shaking during processing of the pipe fittings, which may cause deviation in the position of the pipe fitting threads, and thus improve the processing accuracy of the pipe fittings. At the same time, the clamping block cooperates with the clamping spring to enable it to clamp pipe fittings of different diameters. The feeding push block rotates first under the action of the push rod and the pull rod until the feeding push block contacts the pipe fitting and drives the pipe fitting to move, so that the feeding push block can drive the diameter range of the pipe fitting to increase. At the same time, the rotation angle of the feeding push block is inversely proportional to the diameter of the pipe fitting, so that the overall application range of the device is increased, thereby improving the practicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the overall internal structure of the frame of the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of the clamping seat and its connection relationship of the present invention;

[0019] Figure 4 This is a schematic diagram of the crossbar arrangement and connection relationship structure of the present invention;

[0020] Figure 5 This is a schematic diagram of the cross bar and its connection relationship structure of the present invention;

[0021] Figure 6This is a schematic diagram of the arrangement of the clamping seats and their connection relationship structure of the present invention;

[0022] Figure 7 This is a schematic diagram of the structure of the slide and its connection relationship of the present invention;

[0023] Figure 8 This is a schematic diagram of the arrangement of the clamping rods and their connection relationship structure of the present invention;

[0024] Fig. 9 For the present invention Figure 8 The enlarged structural diagram at A in the middle;

[0025] Fig.10 It is a schematic diagram of the structure of the movable frame and its connection relationship of the present invention;

[0026] Fig.11 It is a schematic diagram of the cross section of the material conveying seat and its connection relationship structure of the present invention;

[0027] Fig.12 It is a schematic diagram of the cross-sectional structure of the support seat of the present invention;

[0028] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0029] 1. Frame; 2. Cutting telescopic rod; 3. Movable frame; 41. Cutting turntable; 42. Cutting knife; 43. Driving gear plate; 44. Cutting motor; 45. Cutting gear; 46. Mounting slot; 47. Fixing bolt; 51. Push rod; 52. Connecting rod; 53. Clamping slot; 54. Clamping shaft; 55. Driving telescopic rod; 61. Transition motor; 62. Transition turntable; 63. Feeding trough; 64. Suction cup; 65. Feeding seat; 66. Conveying Wheel; 7, support seat; 71, shell; 72, support telescopic rod; 73, universal wheel; 74, fixed seat; 81, limit pin; 82, limit spring; 83, limit hole; 9, clamping rod; 10, cross bar; 11, clamping rack; 12, speed regulating gear set; 13, clamping gear; 14, feeding rod; 15, push rod; 16, pull rod; 17, feeding push block; 18, clamping seat; 19, slide seat; 20, clamping block; 21, clamping spring. DETAILED DESCRIPTION

[0030] 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.

[0031] See also Figure 1-12The present invention provides a technical solution: it includes a frame 1, a cutting telescopic rod 2 is installed at the end of the frame 1, a movable end of the cutting telescopic rod 2 is fixedly connected to a movable frame 3, the movable frame 3 is rotatably connected to a cutting assembly, the inner wall of the frame 1 is slidably connected to clamping rods 9 arranged in a circular array, a driving assembly for driving the clamping rods 9 to move toward each other is installed in the frame 1, the clamping rods 9 are all plugged with cross bars 10, and both ends of each cross bar 10 are fixedly connected to a clamping rack 11, the clamping racks 11 are meshed with a speed regulating gear set 12 rotatably connected to the frame 1, and the speed regulating gear set 12 is meshed with a clamping gear rotatably connected to the frame 1 The wheel 13 and the clamping gear 13 are fixedly connected with a feeding rod 14, and the ends of the feeding rod 14 are rotatably connected with a push rod 15, and the other end of one of the feeding rods 14 is rotatably connected with a pull rod 16, and the pull rod 16 and the push rod 15 are rotatably connected with an L-shaped feeding push block 17 through an axis, and the inner wall of the frame 1 is fixedly connected with a clamping seat 18 arranged in a circumferential array, and both sides of the clamping seat 18 are fixedly connected with a slide seat 19 slidably connected with the push block, and the clamping seat 18 is slidably connected with a clamping block 20 with a chamfer, and a clamping spring 21 is fixedly connected between the clamping block 20 and the clamping seat 18, and the frame 1 is installed with a conveying component;

[0032] When in use, the conveying assembly conveys the pipe (the pipe is located on the conveying assembly, and when the conveying assembly encounters an obstacle, the pipe stops moving). When the pipe contacts the feeding push block 17 rotatably connected to the pull rod 16, the pipe stops moving due to resistance. At the same time, the driving assembly drives the clamping rods 9 to approach each other. The clamping rods 9 approach each other and simultaneously drive the cross bar 10 to move. The cross bar 10 drives the clamping rack 11 to move, thereby rotating the speed regulating gear set 12 meshed with it. The speed regulating gear set 12 is used to increase the number of rotations of the clamping gear 13 to ensure that the feeding push block 17 pushes the pipe to move a sufficient distance. The speed regulating gear set 12 drives the clamping gear 13 meshed with it to rotate, and the clamping gear 13 drives the feeding rod 14 to rotate. The feeding rod 1 4 drives the push rod 15 and one end of the pull rod 16 to move. First, the pull rod 16 drives the feeding push block 17 connected to it for rotation to move along the pipe fitting. The feeding push block 17 rotates under the pulling force of the pull rod 16. The other end of the feeding push block 17 squeezes the pipe fitting and drives the pipe fitting to move. The push rod 15 pulls the feeding push block 17 connected to it for rotation to move in the opposite direction of the moving direction of the pipe fitting. The pipe fitting squeezes the clamping block 20 through the chamfer of the clamping block 20. The clamping block 20 compresses the clamping spring 21 and moves into the clamping seat 18 at the same time, so that the distance between the clamping blocks 20 increases. The clamping block 20 clamps and positions the pipe fitting under the action of the clamping spring 21. Then, the pull rod 16 pushes the feeding push block 1 connected to it for rotation in the opposite direction. 7. The feeding push block 17 rotates to make the end part detach from the pipe and move in the opposite direction, and the push rod 15 pushes the feeding push block 17 connected to it to move. The feeding push block 17 rotates to squeeze the pipe at one end and drive the pipe to move between the clamping rods 9. Finally, after the clamping rod 9 contacts the pipe, the pipe is fixed under the joint action of the clamping block 20 and the clamping rod 9, completing the feeding and fixing of the pipe. After the pipe is fixed, the cutting telescopic rod 2 drives the cutting assembly to move, and the cutting assembly performs thread cutting on the pipe. After the thread cutting of the pipe is completed, the cutting telescopic rod 2 resets the cutting assembly (only the cutting assembly needs to be detached from the pipe, and the moving distance is short). The clamping rods 9 move away from each other under the action of the driving assembly, and the cross bar 10 and the clamping The movement process and direction of the rack 11, the speed regulating gear set 12, the clamping gear 13, the feeding rod 14, the push rod 15, the pull rod 16 and the feeding push block 17 are completely opposite to the loading process and will not be described in detail here. Until it is fully reset, the above operation is repeated to realize automatic and continuous pipe loading. At the same time, the pushed pipe contacts the cut pipe to move the cut pipe, and the cut pipe falls after passing through the cutting assembly, thereby realizing automatic loading and unloading. There is no need to equip additional loading and unloading equipment, which reduces the procurement cost of the processing equipment. In addition, there is no need for a sufficient distance between the cutting assembly and the clamping part to ensure that loading and unloading can be carried out, which reduces the loading and unloading time and improves the processing efficiency.

[0033] It should be noted that a buffer needs to be provided at the place where the cut pipe falls to the ground, so as to prevent the cut pipe from directly contacting the frame 1, thereby causing deformation and damage of the pipe thread.

[0034] In the present invention, the clamping rods 9 are close to each other to prepare for clamping the pipe fittings, and at the same time, the pipe fittings on the conveying assembly are moved between the clamping rods 9 through the cross bar 10, the clamping rack 11, the speed regulating gear set 12, the clamping gear 13, the feeding rod 14, the push rod 15, the pull rod 16 and the feeding push block 17 until the clamping rod 9 clamps the pipe fittings. After the pipe fittings are threaded, the newly-incoming pipe fittings push the threaded pipe fittings away from the clamping rod 9, thereby realizing automatic and continuous loading and unloading. In the above process, there is no need to equip additional loading and unloading equipment for loading and unloading, and automatic and continuous loading and unloading can be realized. At the same time, the cutting assembly only needs to move to separate from the pipe fitting, and there is no need to consider the space required for loading and unloading. The cutting assembly will not interfere with the loading and unloading, which shortens the distance the cutting assembly moves, thereby reducing the time required for the cutting assembly to move, thereby shortening the time for thread turning of the pipe fittings and improving the efficiency of thread processing of the pipe fittings.

[0035] In addition, the clamping rod 9 and the clamping block 20 clamp the pipe fittings at different positions of the pipe fittings, thereby improving the stability of the pipe fittings during processing, thereby avoiding shaking during processing of the pipe fittings, which may cause deviations in the position of the pipe thread, thereby improving the accuracy of pipe processing. At the same time, the clamping block 20 cooperates with the clamping spring 21 to enable it to clamp pipe fittings of different diameters. The feeding push block 17 rotates first under the action of the push rod 15 and the pull rod 16 until the feeding push block 17 contacts the pipe fitting and drives the pipe fitting to move, so that the feeding push block 17 can drive the diameter range of the pipe fitting to increase. At the same time, the rotation angle of the feeding push block 17 is inversely proportional to the diameter of the pipe fitting, which increases the overall application range of the device and thereby improves the practicability of the device.

[0036] As a further solution of the present invention, the conveying assembly includes a transition motor 61 installed on the frame 1, the output shaft of the transition motor 61 is fixedly connected to a transition turntable 62, the transition turntable 62 is provided with a feed trough 63 arranged in a circular array, a suction cup 64 is fixedly connected in the feed trough 63, a feed seat 65 is rotatably connected to the bottom of the transition turntable 62, a support seat 7 is fixedly connected to the end of the feed seat 65, and a conveying wheel 66 is rotatably connected in the feed seat 65;

[0037] When in use, the conveying wheel 66 rotates and moves the pipe fittings on the feeding seat 65 through friction, and can stop driving the pipe fittings to move when the pipe fittings encounter an obstacle greater than the friction force between the conveying wheel 66 and the pipe fittings, so as to avoid continuous movement of the pipe fittings, resulting in excessive friction between the transition turntable 62 and the pipe fittings, resulting in increased rotation resistance of the transition turntable 62; the pipe fittings move to the feeding trough 63 on the transition turntable 62 under the action of the conveying wheel 66, and the transition motor 61 drives the transition turntable 62 to rotate. The pipe fittings move to the outer feeding push block 17 under the action of the transition turntable 62, which facilitates the feeding push block 17 to move the pipe fittings. At the same time, the rotation angle of the transition turntable 62 is related to the position of the feeding seat 65. The feeding seat 65 and the transition turntable 62 are rotatably arranged, so that the feeding seat 65 can be rotated at will, so that the appearance of the device is changed, thereby increasing the position where the device can be placed. For example, when the feeding seat 65 is ninety degrees with the frame 1, the device can be placed in the corner of the workshop, so that the device is less restricted by the site, and the practicality of the device is further improved;

[0038] As a further solution of the present invention, the support seat 7 includes a shell 71, a support telescopic rod 72 is fixedly connected inside the shell 71, a universal wheel 73 is fixedly connected to the movable end of the support telescopic rod 72, a fixed seat 74 is slidably connected to the outer wall of the shell 71, and a limit assembly is provided between the fixed seat 74 and the shell 71;

[0039] The support and telescopic rod 72 pulls the universal wheel 73 upward and away from the ground, thereby increasing the contact area between the support seat 7 and the ground and improving the stability of the support seat 7.

[0040] As a further solution of the present invention, the limiting assembly includes a limiting pin 81 slidably connected to the fixing seat 74, a limiting spring 82 is fixedly connected between the limiting pin 81 and the fixing seat 74, and the housing 71 is provided with at least two limiting holes 83 that cooperate with the limiting pin 81;

[0041] When in use, the limiting pin 81 is pulled and pulled out of the limiting hole 83, so that the fixing seat 74 and the shell 71 are detached from each other. When the limiting pin 81 and the limiting hole 83 are coaxial, the limiting spring 82 pulls the limiting pin 81 to be inserted into the limiting hole 83, so that the shell 71 and the fixing seat 74 are fixed. At the same time, the limiting pin 81 will not be detached under the action of the limiting spring 82 without external force, so as to avoid relative movement of the fixing seat 74 and the shell 71, resulting in reduced stability of the support seat 7.

[0042] As a further solution of the present invention, the driving assembly includes a lever 51 rotatably connected to the frame 1, a connecting rod 52 is rotatably connected between the levers 51, a clamping groove 53 is opened at one end of the lever 51, a clamping shaft 54 ​​is slidably connected in the clamping groove 53, and a driving telescopic rod 55 is rotatably connected to the frame 1, and a movable end of the driving telescopic rod 55 is rotatably connected to the hinge between the lever 51 and the connecting rod 52;

[0043] When in use, the telescopic rod 55 is driven to drive one end of one of the levers 51 to rotate, and the other end of the lever 51 pushes the adjacent lever 51 through the connecting rod 52, and so on. When the lever 51 rotates, the clamping rod 9 is driven to move through the clamping groove 53 and the clamping shaft 54, so that the clamping rods 9 are moved closer to or farther from each other. The connecting rod 52 makes each lever 51 rotate synchronously, so that the clamping rod 9 moves synchronously, ensuring that the position of the pipe after being clamped is at the same position, thereby reducing the error during pipe processing;

[0044] As a further solution of the present invention, the cutting assembly includes a cutting disc 41 rotatably connected to the movable frame 3, the cutting disc 41 is equipped with a cutting knife 42, the cutting disc 41 is fixedly connected to a driving toothed disc 43, the movable frame 3 is equipped with a cutting motor 44 through a bracket, and the output shaft of the cutting motor 44 is fixedly connected to a cutting gear 45 meshing with the driving toothed disc 43;

[0045] When in use, the cutting motor 44 drives the driving toothed disc 43 to rotate through the cutting gear 45, and the driving toothed disc 43 drives the cutting knife 42 to rotate. At the same time, the cutting telescopic rod 2 drives the cutting turntable 41 and the cutting knife 42 to move through the movable frame 3, so that the cutting knife 42 can cut the pipe thread.

[0046] As a further solution of the present invention, the cutting disc 41 is provided with mounting grooves 46 arranged in a circumferential array, the axis of the mounting grooves 46 is at different distances from the axis of the cutting disc 41, and the mounting grooves 46 are internally threaded with fixing bolts 47 for fixing the cutting blade 42;

[0047] When in use, the cutting tool 42 is fixed in different mounting grooves 46 by fixing bolts 47, and can turn thread grooves of different depths, thereby improving the use range of the thread lathe and improving the practicability of the thread lathe.

Claims

1. An automatic loading and unloading pipe thread lathe, comprising a frame (1), characterized in that: A cutting telescopic rod (2) is installed at the end of the frame (1), and a movable frame (3) is fixedly connected to the movable end of the cutting telescopic rod (2), and the movable frame (3) is rotatably connected to a cutting assembly. The inner wall of the frame (1) is slidably connected to clamping rods (9) arranged in a circumferential array, and a driving assembly for driving the clamping rods (9) to move toward each other is installed in the frame (1). The clamping rods (9) are all plugged with cross bars (10), and both ends of each end of the cross bar (10) are fixedly connected to a clamping rack (11), and the clamping racks (11) are meshed with a speed regulating gear group (12) rotatably connected to the frame (1), and the speed regulating gear group (12) is meshed with a clamping gear (13) rotatably connected to the frame (1), and the clamping gear (13) is fixedly connected to the frame (1). A feeding rod (14) is fixedly connected, and the ends of the feeding rod (14) are rotatably connected to push rods (15), and the other end of one of the feeding rods (14) is rotatably connected to a pull rod (16), and the pull rod (16) and the push rod (15) are respectively rotatably connected to their respective L-shaped feeding push blocks (17) through axes, and the inner wall of the frame (1) is fixedly connected to clamping seats (18) arranged in a circular array, and both sides of the clamping seats (18) are fixedly connected to sliding seats (19) slidably connected to the two feeding push blocks (17), and the clamping seats (18) are slidably connected to clamping blocks (20) with chamfers, and clamping springs (21) are fixedly connected between the clamping blocks (20) and the clamping seats (18), and the frame (1) is equipped with a conveying assembly.

2. The automatic loading and unloading pipe thread lathe according to claim 1 is characterized in that: The conveying assembly comprises a transition motor (61) mounted on a frame (1); the output shaft of the transition motor (61) is fixedly connected to a transition turntable (62); the transition turntable (62) is provided with a feed trough (63) arranged in a circular array; a suction cup (64) is fixedly connected inside the feed trough (63); a feed seat (65) is rotatably connected to the bottom of the transition turntable (62); an end of the feed seat (65) is fixedly connected to a support seat (7); and a conveying wheel (66) is rotatably connected inside the feed seat (65).

3. The automatic loading and unloading pipe thread lathe according to claim 2 is characterized in that: The support seat (7) comprises a shell (71), a support telescopic rod (72) is fixedly connected inside the shell (71), a universal wheel (73) is fixedly connected to the movable end of the support telescopic rod (72), a fixed seat (74) is slidably connected to the outer wall of the shell (71), and a limit position assembly is arranged between the fixed seat (74) and the shell (71).

4. The automatic loading and unloading pipe thread lathe according to claim 3 is characterized in that: The limiting assembly comprises a limiting pin (81) slidably connected to a fixing seat (74), a limiting spring (82) is fixedly connected between the limiting pin (81) and the fixing seat (74), and the housing (71) is provided with at least two limiting holes (83) cooperating with the limiting pin (81).

5. The automatic loading and unloading pipe thread lathe according to claim 1 is characterized in that: The driving assembly comprises a lever (51) rotatably connected to the frame (1); a connecting rod (52) is rotatably connected between the levers (51); a clamping groove (53) is provided at one end of the lever (51); a clamping shaft (54) is slidably connected in the clamping groove (53); the frame (1) is rotatably connected to a driving telescopic rod (55); a movable end of the driving telescopic rod (55) is rotatably connected to a hinge between the lever (51) and the connecting rod (52).

6. The automatic loading and unloading pipe thread lathe according to claim 5, characterized in that: The cutting assembly comprises a cutting disc (41) rotatably connected to a movable frame (3), the cutting disc (41) being equipped with a cutting knife (42), the cutting disc (41) being fixedly connected to a driving toothed disc (43), the movable frame (3) being equipped with a cutting motor (44) via a bracket, the output shaft of the cutting motor (44) being fixedly connected to a cutting gear (45) meshing with the driving toothed disc (43).

7. The automatic loading and unloading pipe thread lathe according to claim 6, characterized in that: The cutting disc (41) is provided with mounting grooves (46) arranged in a circumferential array, the axes of the mounting grooves (46) are at different distances from the axis of the cutting disc (41), and the mounting grooves (46) are internally threadedly connected with fixing bolts (47) for fixing the cutting blade (42).

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