CN116000387A - Automatic change material loading and unloading pipe screw machine - Google Patents

Abstract

The invention discloses an automatic loading and unloading pipe thread lathe in the technical field of thread lathes. It includes 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 a movable frame, and the movable frame is rotatably connected with a cutting assembly. , the inner wall of the frame is slidably connected with clamping rods arranged in a circular array, and a drive assembly for driving the clamping rods to move in the opposite direction is installed in the frame. Both ends are fixedly connected with a clamping rack, and the clamping racks are meshed with a speed-regulating gear set that is rotatably connected with the frame. It is connected with a feeding rod, and the end of the feeding rod is connected with a push rod, and the other end of one of the feeding rods is connected with a pull rod. There is no need to add additional loading and unloading equipment, and it can also realize automatic loading and unloading. At the same time, the turning part or the clamping Part of the moving distance is shortened to improve work efficiency.

Description

An automatic loading and unloading pipe thread lathe

technical field

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

Background technique

A thread lathe refers to a thread processing machine tool 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 for petroleum and geological drilling; precision screw lathes are mainly used for machining precision threads in the machine tool manufacturing industry .

The existing new pipe thread lathes need to be equipped with loading and unloading equipment for cooperative use, which greatly increases the cost of purchasing turning equipment. In addition, after the turning part of the existing thread lathe turns the workpiece, the turning part or the clamping part needs to move for a long time Make sure that there is enough distance between the turning part and the clamping part for loading and unloading. During the movement of the turning part or the clamping part, the turning time is greatly increased and the work efficiency is reduced.

Contents of the invention

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 clamping part and improve work efficiency.

In order to achieve the above object, the present invention provides the following technical solutions: including a frame, the end of the frame is equipped with a cutting telescopic rod, the movable end of the cutting telescopic rod is fixedly connected to a movable frame, and the movable frame is rotatably connected to a cutting assembly , the inner wall of the frame is slidably connected with clamping rods arranged in a circular array, and a driving assembly for driving the clamping rods to move toward each other is installed in the frame, and the clamping rods are all inserted with cross bars, each Both ends of the ends of each of the crossbars are fixedly connected with clamping racks, and the clamping racks are all meshed with speed regulating gear sets that are rotatably connected with the frame, and the speed regulating gear sets are all meshed with the frame Rotatingly connected clamping gears, the clamping gears are all fixedly connected with feeding rods, and the ends of the feeding rods are all rotatably connected with push rods, and the other end of one of the feeding rods is rotatably connected with a pull rod. Both the pull rod and the push rod are connected with an L-shaped feeding push block through shaft rotation, and the inner wall of the frame is fixedly connected with a clamping seat arranged in a circular array, and both sides of the clamping seat are fixedly connected with a pushing block. The sliding seat is slidingly connected with the block, and the clamping block with chamfer is slidably connected in the clamping seat, and the clamping spring is fixedly connected between the clamping block and the clamping seat, and the rack is installed There are conveying components.

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

As a further solution of the present invention, the support seat includes a shell, the shell is fixedly connected with a support telescopic rod, the movable end of the support telescopic rod is fixedly connected with a universal wheel, and the outer wall of the shell is slidably connected with a fixed seat, so A limiting component is arranged between the fixing seat and the shell.

As a further solution of the present invention, the limiting assembly includes a limiting pin slidingly connected to the fixed base, a limiting spring is fixedly connected between the limiting pin and the fixing base, and the housing is provided with at least two Pin-fit limiting hole.

As a further solution of the present invention, the driving assembly includes a driving rod that is rotatably connected to the frame, and a connecting rod is rotatably connected between the driving rods, and a clamping groove is opened at one end of the driving rod, and the clamping groove The inner slide is connected with a clamping shaft, and the frame is rotatably connected with a driving telescopic rod, and the movable end of the driving telescopic rod is rotatably connected at the hinge joint of the driving rod and the connecting rod.

As a further solution of the present invention, the cutting assembly includes a cutting turntable that is rotatably connected to the movable frame, the cutting turntable is equipped with a cutting knife, the cutting turntable is fixedly connected with a driving tooth disc, and the movable frame is equipped with a cutting blade through a bracket. A motor, the output shaft of the cutting motor is fixedly connected with a cutting gear meshed with the driving toothed disc.

As a further solution of the present invention, the cutting turntable is provided with installation grooves arranged in a circular array, the distances between the axes of the installation grooves and the cutting turntable are different, and the inner threads of the installation grooves are connected with holes for fixing the cutting tool. the fixing bolt;

Compared with prior art, the beneficial effect of the present invention is:

1. In the present invention, the pipe fittings are prepared to be clamped by the clamping rods approaching each other, and at the same time, they are conveyed 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 The pipe fittings on the assembly move between the clamping rods until the clamping rods clamp the pipe fittings. After the pipe fittings are threaded, the new pipe fittings push the turned pipe fittings away from the clamping rods to realize automatic continuous loading and unloading. During the above process, Automatic and continuous loading and unloading can be realized without additional equipment for loading and unloading. At the same time, the cutting assembly only needs to move to separate from the pipe, without considering the space required for loading and unloading, and the cutting assembly will not affect the loading and unloading. Interference is caused to shorten the moving distance of the cutting assembly, thereby reducing the time required for the cutting assembly to move, thereby shortening the time for thread turning of pipe fittings and improving the efficiency of thread processing of pipe fittings.

2. In the present invention, the pipe fittings are clamped at different positions of the pipe fittings by the clamping rod and the clamping block, so as to improve the stability of the pipe fittings during processing, thereby avoiding shaking during the processing of the pipe fittings, resulting in deviation of the thread position of the pipe fittings, and further improving the pipe fittings. At the same time, the cooperation between the clamping block and the clamping spring can make it clamp pipes of different diameters. The feeding push block rotates first under the action of the push rod and the pull rod until the feed push block touches the pipe and drives The movement of the pipe fittings increases the diameter range of the pipe fittings that can be driven by the feeding push block. At the same time, the rotation angle of the feed push block is inversely proportional to the diameter of the pipe fittings, which increases the overall application range of the device and improves the practicability of the device.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that are required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is a schematic diagram of the overall structure of the present invention;

Fig. 2 is a schematic diagram of the overall internal structure of the frame of the present invention;

Fig. 3 is a structural schematic diagram of the clamping seat and its connection relationship of the present invention;

Fig. 4 is a structural schematic diagram of the arrangement of crossbars and their connection relationship in the present invention;

Fig. 5 is a structural schematic diagram of the crossbar and its connection relationship of the present invention;

Fig. 6 is a structural schematic diagram of the arrangement of the clamping seats and their connection relationship in the present invention;

Fig. 7 is a structural schematic diagram of the sliding seat and its connection relationship of the present invention;

Fig. 8 is a structural schematic diagram of the arrangement of clamping rods and their connection relationship in the present invention;

Fig. 9 is a schematic diagram of an enlarged structure at A in Fig. 8 of the present invention;

Fig. 10 is a structural schematic diagram of the movable frame and its connection relationship of the present invention;

Fig. 11 is a schematic diagram of the section of the material delivery seat of the present invention and its connection relationship;

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

In the accompanying drawings, the list of parts represented by each label is as follows:

1. Rack; 2. Cutting telescopic rod; 3. Movable frame; 41. Cutting turntable; 42. Cutting knife; 43. Drive toothed plate; 44. Cutting motor; 45. Cutting gear; 46. Installation groove; 47. Fixed Bolt; 51, driving rod; 52, connecting rod; 53, clamping groove; 54, clamping shaft; 55, driving telescopic rod; 61, excessive motor; 62, excessive turntable; 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, sliding seat; 20, clamping block; 21, clamping spring.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Please refer to Figures 1-12, the present invention provides a technical solution: including a frame 1, a cutting telescopic rod 2 is installed at the end of the frame 1, and the movable end of the cutting telescopic rod 2 is fixedly connected with a movable frame 3, and the movable frame 3 is connected in rotation There are cutting components, the inner wall of the frame 1 is slidingly connected with clamping rods 9 arranged in a circular array, and the drive assembly for driving the clamping rods 9 to move in the opposite direction is installed in the frame 1, and the clamping rods 9 are all inserted with cross bars 10. Both ends of the ends of each cross bar 10 are fixedly connected with clamping racks 11, and the clamping racks 11 are meshed with speed-regulating gear sets 12 that are rotatably connected with the frame 1, and the speed-regulating gear sets 12 are meshed with The clamping gear 13 that is rotatably connected with the frame 1, the clamping gear 13 is fixedly connected with a feed rod 14, and the ends of the feed rod 14 are rotatably connected with a push rod 15, and the other end of one of the feed rod 14 is rotatably connected with a Pull rod 16, pull rod 16 and push rod 15 are all connected with the feeding push block 17 of L-shaped structure through shaft rotation, and frame 1 inner wall is fixedly connected with the clamping seat 18 that is arranged in circular array, and clamping seat 18 both sides A sliding seat 19 is fixedly connected to the push block, and a clamping block 20 with chamfers is slidably connected in the clamping seat 18, and a clamping spring is fixedly connected between the clamping block 20 and the clamping seat 18. 21. Rack 1 is equipped with conveying components;

During use, the conveying assembly transports the pipe fittings (the pipe fittings are located on the conveying assembly, and when the conveying assembly encounters obstacles, the pipe fittings stop moving), when the pipe fittings contact the feeding push block 17 that is rotatably connected with the pull rod 16, the pipe fittings are subjected to resistance and stop moving, and at the same time , the driving assembly drives the clamping rods 9 to approach each other, and the clamping rods 9 drive the crossbar 10 to move when they are close to each other, and the crossbar 10 drives the clamping rack 11 to move, so that the speed regulating gear set 12 meshing with it rotates, and the speed regulating gear Group 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 Rotate, the feeding rod 14 drives the push rod 15 and one end of the pull rod 16 to move. At first, the pull rod 16 drives the feed push block 17 connected to the pull rod to move along the pipe, and the feed push block 17 will rotate 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 to move in the opposite direction of the pipe fitting moving direction, and the pipe fitting squeezes the holding block through the clamping block 20 chamfering 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, and the clamping block 20 clamps and positions the pipe under the action of the clamping spring 21 , and then, the pull rod 16 reversely pushes the feed push block 17 which is connected to it in rotation, and this feed push block 17 rotates so that the end is separated from the pipe fitting and moves in reverse, while the push rod 15 pushes the feed push block 17 which is connected to it to move , the feeding push block 17 rotates to squeeze one end of the pipe and drives the pipe to move between the clamping rods 9. Finally, after the clamping rod 9 contacts the pipe, the pipe is under the joint action of the clamping block 20 and the clamping rod 9 After the pipe fittings are fixed, the cutting telescopic rod 2 drives the cutting assembly to move, and the cutting assembly performs thread cutting on the pipe fittings. After the thread cutting of the pipe fittings, the cutting telescopic rod 2 resets the cutting assembly (only cutting The component can be separated from the pipe fitting, and the moving distance is short) the clamping rod 9 is away from each other under the action of the driving component, the cross bar 10, the clamping rack 11, the speed regulating gear group 12, the clamping gear 13, the feeding rod 14, the pusher The moving process and direction of the rod 15, the pull rod 16 and the feeding push block 17 are completely opposite to the feeding process, and will not be described in detail here until they are completely reset. Repeat the above operations to realize automatic and continuous pipe fitting feeding. The pipe fittings interfere with the cut pipe fittings, so that the cut pipe fittings move, and the cut pipe fittings pass through the cutting assembly and fall down, so as to realize automatic loading and unloading, without additional loading and unloading equipment, which reduces the purchase cost of processing equipment. , and there is no need for a sufficient distance between the cutting component and the clamping part, so as to ensure that the loading and unloading can be carried out, which reduces the time for loading and unloading, and thus improves the processing efficiency.

It should be noted that a buffer should be provided at the landing place of the cut pipe fitting to avoid direct contact between the cut pipe fitting and the frame 1, resulting in deformation and damage to the thread of the pipe fitting.

In the present invention, the clamping rods 9 are close to each other to prepare to clamp the pipe fittings. The pipe fittings on the feeding push block 17 conveying assembly move between the clamping rods 9 until the clamping rods 9 clamp the pipe fittings. After the pipe fittings are threaded, the newly entered pipe fittings push the turned pipe fittings away from the clamping rods 9 to realize 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 components only need to move to separate from the pipe fittings, and there is no need to consider the space required for loading and unloading. , The cutting assembly will not interfere with loading and unloading, shortening the moving distance of the cutting assembly, thereby reducing the time required for the cutting assembly to move, thereby shortening the time for pipe thread turning and improving the efficiency of pipe thread processing.

In addition, the clamping rod 9 and the clamping block 20 clamp the pipe fittings at different positions of the pipe fittings to improve the stability of the pipe fittings during processing, so as to avoid shaking during the processing of the pipe fittings, resulting in deviation of the thread position of the pipe fittings, thereby improving the processing precision of the pipe fittings At the same time, the clamping block 20 cooperates with the clamping spring 21 to enable it to clamp pipes of different diameters, and the feed push block 17 rotates first under the action of the push rod 15 and the pull rod 16 until the feed push block 17 contacts After the pipe fittings, the pipe fittings are driven to move, so that the feeding push block 17 can drive the diameter range of the pipe fittings to increase. At the same time, the rotation angle of the feeding push block 17 is inversely proportional to the diameter of the pipe fittings, which increases the overall application range of the device and improves the practicability of the device. .

As a further solution of the present invention, the conveying assembly includes a transitional motor 61 installed on the frame 1, the output shaft of the transitional motor 61 is fixedly connected with a transitional turntable 62, and the transitional turntable 62 is provided with feeding troughs 63 arranged in a circular array. A suction cup 64 is fixedly connected in the material trough 63, a material delivery seat 65 is rotatably connected to the bottom of the transitional turntable 62, a support seat 7 is fixedly connected to the end of the material delivery seat 65, and a delivery wheel 66 is rotatably connected to the interior of the material delivery seat 65;

When in use, the delivery wheel 66 rotates and moves the pipe fittings on the material delivery seat 65 through friction, and can stop driving the pipe fittings to move when the pipe encounters an obstacle greater than the friction force between the delivery wheel 66 and the pipe fittings, so as to avoid continuous movement of the pipe fittings, resulting in excessive The friction between the turntable 62 and the pipe fittings is too large, resulting in an increase in the rotation resistance of the turntable 62; the pipe fittings move to the feeding trough 63 on the turntable 62 under the action of the delivery wheel 66, and the turntable 62 is driven by the turntable motor 61 to rotate, and the pipe fittings are placed on the turntable Under the action of 62, it moves to the outer feeding push block 17, which is convenient for the feed push block 17 to move the pipe fittings. At the same time, the rotation angle of the excessive turntable 62 is related to the position of the feeding seat 65. The material seat 65 can be rotated at will, so that the shape of the device can be changed, so that the position where the device can be placed can be increased. The limit becomes smaller, further improving the practicability of the device;

As a further solution of the present invention, the support seat 7 includes a shell 71, the shell 71 is fixedly connected with a support telescopic rod 72, the movable end of the support telescopic rod 72 is fixedly connected with a universal wheel 73, and the outer wall of the shell 71 is slidably connected with a fixed seat 74. A limiting assembly is arranged between the seat 74 and the shell 71;

During use, before the material feeding seat 65 moves, the movable end of the supporting telescopic rod 72 drives the universal wheel 73 to move downward until the universal wheel 73 touches the ground, and then cancels the limit assembly between the fixed seat 74 and the shell 71. The fixed seat 74 can move relative to the shell 71, and the fixed seat 74 moves upwards and breaks away from the ground. At this time, the universal wheel 73 contacts the ground to reduce the friction between the support seat 7 and the ground, and reduce the resistance when the material delivery seat 65 rotates. After rotating to a suitable position, the bottom of the fixing seat 74 is brought into contact with the ground again and fixed with the housing 71 by the limit assembly, and the supporting telescopic rod 72 pulls the universal wheel 73 upwards and breaks away from the ground to increase the contact area between the support seat 7 and the ground and improve The stability of support seat 7 has been improved.

As a further solution of the present invention, the limit assembly includes a limit pin 81 that is slidably connected to the fixed seat 74, and a limit spring 82 is fixedly connected between the limit pin 81 and the fixed seat 74. The limit hole 83 that pin 81 cooperates;

During use, pull the limit pin 81 and pull the limit pin 81 out of the limit hole 83, so that the fixing seat 74 is separated from the housing 71 and fixed. When the limit pin 81 is coaxial with the limit hole 83, the limit spring 82 pulls The limit pin 81 is inserted in the limit hole 83 to fix the housing 71 and the fixed seat 74, and the limit pin 81 will not disengage under the action of the limit spring 82 without external force, so as to avoid the fixed seat 74 and the shell 71. Relative movement causes the stability of the support seat 7 to decrease;

As a further solution of the present invention, the drive assembly includes a driving lever 51 that is rotatably connected to the frame 1, and a connecting rod 52 is rotatably connected between the driving levers 51. One end of the driving lever 51 is provided with a clamping groove 53, and inside the clamping groove 53 Slidingly connected with a clamping shaft 54, the frame 1 is rotatably connected with a driving telescopic rod 55, and the movable end of the driving telescopic rod 55 is rotatably connected at the hinge joint between the driving rod 51 and the connecting rod 52;

When in use, drive the telescopic rod 55 to drive one end of one of the driving rods 51 to rotate, and the other end of the driving rod 51 pushes the adjacent driving rod 51 through the connecting rod 52, and so on. When the driving rod 51 rotates, it passes through the clamping groove 53 and the clamping shaft 54 Drive the clamping rods 9 to move, thereby realizing the mutual approach and distance of the clamping rods 9, and the connecting rod 52 makes each driving rod 51 rotate synchronously, thereby making the clamping rods 9 move synchronously, ensuring that the position of the pipe after being clamped is at the same Position, reduce the error when processing pipe fittings;

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

When in use, the cutting motor 44 drives the toothed disc 43 to rotate through the cutting gear 45, and the driven 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, thereby realizing the cutting tool. 42 pairs of pipe thread cutting;

As a further solution of the present invention, the cutting turntable 41 is provided with mounting grooves 46 arranged in a circular array, the distances between the axes of the mounting grooves 46 and the cutting turntable 41 are different, and the mounting grooves 46 are internally threaded to be used for fixing the cutting blade 42. The fixing bolt 47;

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

Claims (7)

1. An automatic loading and unloading pipe thread lathe, comprising a frame (1), characterized in that: the end of the frame (1) is equipped with a cutting telescopic rod (2), and the movable end of the cutting telescopic rod (2) A movable frame (3) is fixedly connected, and the movable frame (3) is rotatably connected with a cutting assembly, and the inner wall of the frame (1) is slidably connected with clamping rods (9) arranged in a circular array, and the frame (1) is equipped with a drive assembly for driving the clamping rods (9) to move toward each other. The clamping rods (9) are all inserted with cross bars (10), and each of the ends of the cross rods (10) has two ends. Both ends are fixedly connected with a clamping rack (11), and the clamping rack (11) is meshed with a speed-regulating gear set (12) that is rotatably connected with the frame (1), and the speed-regulating gear set (12) ) are all meshed with clamping gears (13) that are rotatably connected to the frame (1), and the clamping gears (13) are all fixedly connected with feeding rods (14), and the ends of the feeding rods (14) are all A push rod (15) is rotatably connected, 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 connected with an L-shaped structure through a shaft rotation The feeding push block (17), the inner wall of the frame (1) is fixedly connected with the clamping seat (18) arranged in a circular array, and the both sides of the clamping seat (18) are fixedly connected with the push block Slidingly connected sliding seat (19), the clamping block (20) with chamfers is slidably connected in the clamping seat (18), the clamping block (20) and the clamping seat (18) Clamping springs (21) are fixedly connected between them, and the frame (1) is equipped with a conveying assembly. 2. A kind of automatic loading and unloading pipe threading lathe according to claim 1, characterized in that: the conveying assembly includes a transition motor (61) installed on the frame (1), and the transition motor (61) outputs The shaft is fixedly connected with a transitional turntable (62), and the transitional turntable (62) is provided with feeding troughs (63) arranged in a circular array, and suction cups (64) are fixedly connected in the feeding chute (63), so The bottom of the transitional turntable (62) is rotatably connected with a feeding seat (65), the end of the feeding seat (65) is fixedly connected with a support seat (7), and the inside of the feeding seat (65) is rotatably connected with a conveying wheel (66). 3. An automatic loading and unloading pipe thread lathe according to claim 2, characterized in that: the support seat (7) includes a casing (71), and a support telescopic rod (72) is fixedly connected inside the casing (71) ), the movable end of the supporting telescopic rod (72) is fixedly connected with a universal wheel (73), and the outer wall of the casing (71) is slidably connected with a fixed seat (74), and the fixed seat (74) is connected with the casing (71) There are limited components between them. 4. A kind of automatic loading and unloading pipe threading lathe according to claim 3, characterized in that: the limit assembly includes a limit pin (81) slidingly connected to the fixed seat (74), and the limit pin ( 81) is fixedly connected with a limit spring (82) with the fixed seat (74), and the housing (71) is provided with at least two limit holes (83) matched with the limit pin (81). 5. An automatic loading and unloading pipe thread lathe according to claim 1, characterized in that: the driving assembly includes a driving lever (51) rotatably connected to the frame (1), and one of the driving levers (51) A connecting rod (52) is rotatably connected between them, and one end of the driving rod (51) is provided with a clamping groove (53), and a clamping shaft (54) is slidably connected in the clamping groove (53). The frame (1) is rotatably connected with a driving telescopic rod (55), and the movable end of the driving telescopic rod (55) is rotatably connected at the hinged part of the driving rod (51) and the connecting rod (52). 6. A kind of automatic loading and unloading pipe thread lathe according to claim 5, characterized in that: the cutting assembly includes a cutting turntable (41) which is rotatably connected with the movable frame (3), and the cutting turntable (41) is installed There is a cutting knife (42), the cutting turntable (41) is fixedly connected with a drive 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) A cutting gear (45) meshed with the drive chainring (43) is fixedly connected. 7. An automatic loading and unloading pipe thread lathe according to claim 6, characterized in that: the cutting turntable (41) is provided with mounting grooves (46) arranged in a circular array, and the mounting grooves (46) The distance between the axis and the axis of the cutting turntable (41) is different, and the mounting groove (46) is internally threaded with a fixing bolt (47) for fixing the cutting knife (42).

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