Pipe feeding device

Abstract

The utility model relates to the technical field of pipe cutting machining, in particular to a pipe feeding device which comprises a transmission mechanism, a jacking mechanism, a clamping mechanism and a plurality of conveying mechanisms. The multiple conveying mechanisms are arranged in parallel in the longitudinal direction. The multiple conveying mechanisms are connected with the transmission mechanism, and the transmission mechanism can synchronously drive the conveying belts of the multiple conveying mechanisms to move in the transverse direction. A jacking mechanism and / or a clamping mechanism are / is arranged between a pair of adjacent conveying mechanisms in the longitudinal direction; the jacking mechanism and the clamping mechanism can ascend and descend in the vertical direction. And the pipe is clamped through the clamping mechanism, so that the stability in the pipe jacking process is guaranteed. The pipe in the jacking process and the pipe in the cutting process are continuously supported through the jacking mechanism, fulcrum structures except a chuck are effectively added, and the adaptability to machining of long pipes is high.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe cutting and processing, in particular to a pipe feeding device. Background Art

[0002] The pipe loading device is a common loading tool for transporting pipes. The pipes are placed on the pipe loading device manually or by external equipment, and the pipe loading device then transports the pipes to the next station for processing. When cutting pipes, the pipe loading device generally transports the pipes through a conveyor belt structure such as a belt or chain, and transports the pipes from one end of the conveyor belt to the other end. Sometimes it is necessary to lift the pipes so that the pipes can dock with the chuck of the next process, and the chuck clamps the pipes and transports them for cutting. After the chuck clamps the pipes, it drives the pipes to rotate and move horizontally toward the cutting machine, and the cutting machine cuts the pipes.

[0003] When it is necessary to lift the pipe, generally multiple lifting and clamping mechanisms capable of vertical lifting are arranged on the inner side of multiple conveyor belts. Multiple clamping and lifting mechanisms first clamp the pipe synchronously, and then lift the pipe to a height coaxial with the axis of the chuck, which can effectively ensure the stability of the pipe during the lifting process. However, since the pipe needs to rotate continuously during the cutting process, multiple clamping and lifting mechanisms need to be lowered and reset after the pipe and the chuck are docked. This is suitable for pipes with shorter lengths, but has poor adaptability for pipes with longer lengths. This is because the pipe is clamped by only one pair of chucks, and the distance between the center of gravity of the pipe and the chuck is large, which makes it easy for the long pipe to deform during the cutting process, resulting in reduced quality of the pipe or even scrapping. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a pipe feeding device, which solves the technical problem that the traditional pipe feeding device has poor transportation stability when transporting pipes with a long length.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose, the pipe feeding device of the utility model comprises a transmission mechanism, a lifting mechanism, a clamping mechanism and a plurality of conveying mechanisms;

[0008] A plurality of the conveying mechanisms are arranged in parallel along the longitudinal direction;

[0009] The plurality of conveying mechanisms are connected to the transmission mechanism, and the transmission mechanism can synchronously drive the conveying belts of the plurality of conveying mechanisms to move in the lateral direction;

[0010] Along the longitudinal direction, the lifting mechanism and / or the clamping mechanism is arranged between a pair of adjacent conveying mechanisms;

[0011] The lifting mechanism and the clamping mechanism can both be lifted and lowered in a vertical direction.

[0012] Optionally, the lifting mechanism includes a lifting drive and a lifting wheel;

[0013] The telescopic rod of the lifting drive is connected to the lifting wheel, and the lifting drive can drive the lifting wheel to rise and fall along the vertical direction;

[0014] A concave slot is provided on the side wall of the lifting wheel.

[0015] Optionally, the lifting mechanism further includes a supporting slide plate and a positioning pin; the lifting wheel is a variable diameter wheel;

[0016] The supporting slide plate is connected to the telescopic rod of the lifting drive, and the lifting drive can drive the supporting slide plate to rise and fall along the vertical direction;

[0017] The variable diameter wheel is rotatably connected to the supporting slide plate;

[0018] The end surface of the variable diameter wheel is provided with a plurality of plug-in holes along its circumference; the plurality of plug-in holes are provided with the concave slots of a plurality of sizes corresponding to each other along the transverse direction;

[0019] A positioning hole is provided on the supporting slide plate, and the inserting hole and the positioning hole are fixed by the positioning pin.

[0020] Optionally, the lifting drive is a double-stage lifter; the double-stage lifter includes a primary lifter and a secondary lifter;

[0021] The telescopic rod of the first-stage lifter is connected to the second-stage lifter; the telescopic rod of the second-stage lifter is connected to the lifting wheel.

[0022] Optionally, the clamping mechanism includes a lifting drive, a mounting slide, a roller assembly and a clamp;

[0023] The telescopic rod of the lifting drive is connected to the mounting slide, and the lifting drive can drive the mounting slide to rise and fall along the vertical direction;

[0024] The roller assembly and the clamp are both mounted on the mounting slide plate; the clamp can clamp or release the roller assembly along the axial direction.

[0025] Optionally, the roller assembly includes a support roller, a fixing frame, an adjusting screw and a locking knob;

[0026] The fixing frame is slidably connected to the mounting slide along the vertical direction;

[0027] The support roller is mounted on the fixing frame;

[0028] The adjusting screw is rotatably connected to the mounting slide and is threadedly connected to the fixing frame; the self-rotation of the adjusting screw can drive the mounting slide to rise and fall along the vertical direction;

[0029] The adjusting screw is threadedly connected to the mounting slide plate so as to be able to abut against or move away from the adjusting screw;

[0030] The clamp is connected to the fixing frame.

[0031] Optionally, a scale is provided on the fixing frame, and a pointer is provided on the mounting slide.

[0032] Optionally, the conveying mechanism further comprises a bracket and a plurality of blocking blocks;

[0033] The conveyor belt is installed on the bracket; along the transverse direction, a plurality of the blocking blocks are arranged in an array on the conveyor belt.

[0034] Optionally, the feeding device further comprises a positioning frame;

[0035] The positioning frame is provided with a support rod; the support rod is arranged parallel to the conveyor belt, and the top surfaces of the two are in the same horizontal plane.

[0036] Optionally, the transmission mechanism includes a driver, a connecting rod and a plurality of transmission gears;

[0037] A plurality of transmission gears are sleeved on the connecting rod;

[0038] The plurality of transmission gears are meshed and driven one by one with the conveyor belts of the plurality of conveying mechanisms;

[0039] The driver is connected to the connecting rod and can drive the connecting rod to rotate.

[0040] (III) Beneficial effects

[0041] The beneficial effects of the utility model are:

[0042] Multiple conveying mechanisms are connected to the transmission mechanism, and the transmission mechanism can synchronously drive the conveyor belts of the multiple conveying mechanisms to move laterally, thereby improving the synchronous driving performance of the multiple conveying mechanisms, thereby improving the transportation stability of the pipe on the conveyor belt, and also improving the docking position accuracy between the pipe and the lifting mechanism and the clamping mechanism during jacking.

[0043] A lifting mechanism and / or a clamping mechanism is provided between a pair of adjacent conveying mechanisms, and the clamping mechanism clamps the pipe to ensure stability during the lifting process. The lifting mechanism continuously supports the pipe during the lifting process and the cutting process, effectively increasing the fulcrum structure in addition to the chuck, and has strong adaptability to the processing of longer pipes.

[0044] The lifting mechanism and the clamping mechanism are both arranged on the inner side of the multiple conveying mechanisms, occupying a small space. When lifting the pipe, the lifting mechanism and the clamping mechanism support the pipe at the same time, and the clamping mechanism clamps the pipe to limit the pipe horizontally. When cutting the pipe, the clamping mechanism is reset, and the lifting mechanism continues to support the pipe, effectively avoiding deformation of the long pipe during cutting; and, the multiple lifting mechanisms are reset one by one as the chuck approaches, effectively ensuring the number of pipe fulcrums during the entire cutting process, and realizing stable cutting and processing of long pipes.

[0045] The jacking mechanism is integrated into the pipe feeding device. The jacking mechanism is used to lift and support the pipe, and also to support the pipe rotating during the cutting process. It is multi-purpose and improves the integration of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a structural schematic diagram of the pipe feeding device of the utility model;

[0047] Figure 2 It is a connection diagram of the transmission mechanism and the conveying mechanism of the utility model;

[0048] Figure 3 It is a structural schematic diagram of the jacking mechanism of the utility model;

[0049] Figure 4 It is a structural schematic diagram of the clamping mechanism of the utility model;

[0050] Figure 5 It is a structural schematic diagram of the roller assembly of the utility model.

[0051] [Description of Reference Numerals]

[0052] 1: Transmission mechanism; 11: Driver; 12: Connecting rod;

[0053] 2: Lifting mechanism; 21: Lifting driver; 223: Primary track; 224: Slider; 225: Secondary lifter; 226: Secondary track;

[0054] 22: lifting wheel; 221: concave slot; 222: plug-in hole; 23: supporting slide plate; 24: positioning pin;

[0055] 3: Clamping mechanism; 31: Lifting drive; 32: Mounting slide; 321: Pointer; 33: Roller assembly; 331: Support roller; 332: Fixed frame; 3321: Scale; 333: Adjusting screw; 334: Locking knob; 34: Clamp;

[0056] 4: conveying mechanism; 41: bracket; 411: leveling legs; 412: connecting legs; 42: blocking block; 43: conveyor belt;

[0057] 5: Positioning frame. DETAILED DESCRIPTION

[0058] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0059] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0060] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] See also Figure 1 and Figure 2The utility model provides a pipe feeding device, which includes a transmission mechanism 1, a lifting mechanism 2, a clamping mechanism 3 and a plurality of conveying mechanisms 4; the plurality of conveying mechanisms 4 are arranged in parallel along the longitudinal direction; the plurality of conveying mechanisms 4 are connected to the transmission mechanism 1, and the transmission mechanism 1 can synchronously drive the conveyor belts 43 of the plurality of conveying mechanisms 4 to move in the transverse direction; in the longitudinal direction, a lifting mechanism 2 and / or a clamping mechanism 3 are arranged between a pair of adjacent conveying mechanisms 4; the lifting mechanism 2 and the clamping mechanism 3 can both be lifted and lowered in the vertical direction. The transverse direction is the sliding direction of the conveyor belt 43, and the longitudinal direction is the axial direction of the pipe after the pipe is placed on the pipe feeding device.

[0063] Multiple conveying mechanisms 4 are connected to the transmission mechanism 1, and the transmission mechanism 1 can synchronously drive the conveyor belts 43 of the multiple conveying mechanisms 4 to move laterally, thereby improving the synchronous driving performance of the multiple conveying mechanisms 4, thereby improving the transportation stability of the pipe on the conveyor belt 43, and also improving the docking position accuracy between the pipe and the jacking mechanism 2 and the clamping mechanism 3 during jacking.

[0064] A lifting mechanism 2 and / or a clamping mechanism 3 are provided between a pair of adjacent conveying mechanisms 4. The clamping mechanism 3 clamps the pipe to ensure stability during the lifting process. The lifting mechanism 2 continuously supports the pipe during the lifting process and the pipe during the cutting process, effectively increasing the fulcrum structure in addition to the chuck, and having strong adaptability to the processing of longer pipes.

[0065] The lifting mechanism 2 and the clamping mechanism 3 are both arranged on the inner side of the multiple conveying mechanisms 4, occupying a small space. When lifting the pipe, the lifting mechanism 2 and the clamping mechanism 3 support the pipe at the same time, and the clamping mechanism 3 clamps the pipe to limit the pipe horizontally. When cutting the pipe, the clamping mechanism 3 is reset, and the lifting mechanism 2 continues to support the pipe, effectively avoiding deformation of the long pipe during cutting; and the multiple lifting mechanisms 2 are reset one by one as the chuck approaches, effectively ensuring the number of pipe fulcrums during the entire cutting process, and realizing stable cutting and processing operations of long pipes.

[0066] The jacking mechanism 2 is integrated into the pipe feeding device. The jacking mechanism 2 is used for both jacking and supporting the pipe and for supporting the pipe rotating during the cutting process. It is multi-functional and improves the integration of the equipment.

[0067] like Figure 3As shown, the lifting mechanism 2 includes a lifting driver 21 and a lifting wheel 22; the telescopic rod of the lifting driver 21 is connected to the lifting wheel 22, and the lifting driver 21 can drive the lifting wheel 22 to rise and fall in the vertical direction; a concave card slot 221 is provided on the side wall of the lifting wheel 22. The lifting driver 21 is one of a cylinder, a hydraulic cylinder or an electric push rod. The shape of the concave card slot 221 can be square, or it can be adapted to the shape of the outer wall of the pipe, that is, an arc shape, so as to improve the support stability of the lifting wheel 22. The concave card slot 221 can support the pipe without affecting the rotation of the pipe during the cutting process, and can effectively cooperate with the chuck to perform the cutting and processing of the pipe.

[0068] Furthermore, the lifting mechanism 2 also includes a support slide 23 and a positioning pin 24; the lifting wheel 22 is a variable diameter wheel; the support slide 23 is connected to the telescopic rod of the lifting driver 21, and the lifting driver 21 can drive the support slide 23 to rise and fall in the vertical direction; the variable diameter wheel is rotatably connected to the support slide 23; the end face of the variable diameter wheel is provided with a plurality of plug holes 222 along its circumference; the plurality of plug holes 222 are provided with concave slots 221 of a plurality of sizes in a one-to-one correspondence along the transverse direction; the support slide 23 is provided with a positioning hole, and the plug hole 222 and the positioning hole are fixed by the positioning pin 24. Specifically, the fulcrum changes synchronously when the variable diameter wheel rotates, and by providing a plurality of sizes of concave slots 221, the variable diameter wheel can support pipes of different outer diameters, thereby improving the adaptability of the pipe feeding device to the processing of pipes of different outer diameters. Optionally, the pipe model is marked on the end surface of the reducing wheel at the positions corresponding to the multiple plug holes 222, so that the model of the concave slot 221 corresponding to the reducing wheel can be quickly adjusted according to the pipe model to achieve rapid diameter change. The quick-release connection structure of the plug hole 222, the positioning hole and the positioning pin 24 is easy to disassemble and assemble, so that the reducing wheel can be quickly fixed and the diameter can be adjusted.

[0069] Secondly, the lifting drive 21 is a two-stage lifter; the two-stage lifter includes a first-stage lifter and a second-stage lifter 225; the telescopic rod of the first-stage lifter is connected to the second-stage lifter 225; the telescopic rod of the second-stage lifter 225 is connected to the lifting wheel 22. In this embodiment, the two-stage lifter also includes a mounting seat, a first-stage track 223, a slider 224 and a second-stage track 226. The telescopic rod of the first-stage lifter is connected to the mounting seat and guided and slidable through the first-stage track 223; the slider 224 is connected to the mounting seat, and the second-stage lifter 225 is installed on the slider 224; the telescopic rod of the second-stage lifter 225 is connected to the supporting slide plate 23 and guided and slidable through the second-stage track 226. Among them, the first-stage lifter and the second-stage lifter 225 can be one of a cylinder, a hydraulic cylinder or an electric push rod, and can be a linear propulsion device. The second-stage lifter 225 can compensate for the lifting height of the variable diameter wheel, and the first-stage lifter and the second-stage lifter 225 can be lifted and lowered synchronously, effectively reducing the lifting time of the lifting mechanism 2. The double-stage lifter can be lifted twice in the vertical direction, which effectively increases the lifting stroke of the lifting driver 21 and improves the docking position accuracy of the pipe and the chuck.

[0070] See also Figure 4 The clamping mechanism 3 includes a lifting driver 31, a mounting slide 32, a roller assembly 33 and a clamp 34; the telescopic rod of the lifting driver 31 is connected to the mounting slide 32, and the lifting driver 31 can drive the mounting slide 32 to lift and lower in the vertical direction; the roller assembly 33 and the clamp 34 are both installed on the mounting slide 32; the clamp 34 can clamp or release the roller assembly 33 along the axial direction. In this embodiment, the lifting driver 31 has the same structure as the lifting driver 21, which is convenient for the maintenance and replacement of equipment parts; the clamp 34 is driven by a cylinder to move a pair of jaws in reverse. Specifically, the roller assembly 33 is used to support the pipe. Since there may be a placement error in the pipe, in the process of the clamp 34 clamping the pipe, the clamp 34 pushes the pipe to roll on the roller assembly 33 to achieve the centering of the pipe, even if the axis of the pipe coincides with the axis of the chuck in the vertical direction, it is convenient for the pipe to dock with the chuck after lifting. The clamping mechanism 3 has both clamping and supporting operations, and cooperates with the jacking mechanism 2 to jack up the pipe, which effectively improves the transportation stability during the pipe jacking process.

[0071] like Figure 5As shown, the roller assembly 33 includes a support roller 331, a fixing frame 332, an adjusting screw 333 and a locking knob 334; the fixing frame 332 is slidably connected with the mounting slide 32 in the vertical direction; the support roller 331 is mounted on the fixing frame 332; the adjusting screw 333 is rotatably connected with the mounting slide 32 and is threadedly connected with the fixing frame 332; the self-rotating adjusting screw 333 can drive the mounting slide 32 to rise and fall in the vertical direction; the adjusting screw 333 is threadedly connected with the mounting slide 32 so as to be able to abut against or move away from the adjusting screw 333; the clamp 34 is connected with the fixing frame 332 and rises and falls synchronously with the fixing frame 332. When processing pipes with different outer diameters, the top of the support roller 331, i.e., the fulcrum height, needs to be adjusted accordingly. Specifically, first loosen the locking knob 334 to release the abutment limit of the locking knob 334 on the adjusting screw 333; rotate the adjusting screw 333, and the fixing frame 332 is raised and lowered synchronously; tighten the locking knob 334, fix the adjusting screw 333, and complete the adjustment of the fulcrum height of the support roller 331, so that the fulcrum height of the support roller 331 is consistent with the fulcrum height of the concave slot 221 corresponding to the lifting wheel 22.

[0072] Furthermore, a scale 3321 is provided on the fixing frame 332, and a pointer 321 is provided on the mounting slide 32. When adjusting the fulcrum height of the roller assembly 33, the scale 3321 is raised and lowered synchronously, and the size of the corresponding model on the scale 3321 is aligned with the pointer 321 according to the outer diameter size of the required processed pipe, so as to achieve accurate and rapid adjustment of the fulcrum height of the roller assembly 33.

[0073] See here Figure 2 , the conveying mechanism 4 also includes a bracket 41 and a plurality of stop blocks 42; the conveyor belt 43 is installed on the bracket 41; in the horizontal direction, a plurality of stop blocks 42 are arranged in an array on the conveyor belt 43. In this embodiment, a transmission mechanism 1 is arranged at one end of the bracket 41, and the other end is connected to the chuck mechanism of the next process. The pipe can be placed between a pair of adjacent stop blocks 42 manually or by external equipment, that is, the pipe is engaged in the inside of a pair of adjacent stop blocks 42, and the lateral movement of the pipe is limited by a pair of adjacent stop blocks 42, so as to realize the stable transportation of the pipe in the horizontal direction on the conveyor belt 43. In this embodiment, a leveling leg 411 and a connecting leg 412 are arranged at the bottom end of the bracket 41, and an adjuster is arranged at the bottom end of the leveling leg 411 for adjusting the horizontality of the bracket 41; the connecting leg 412 is connected to the chuck mechanism of the next process.

[0074] Secondly, the feeding device also includes a positioning frame 5; the positioning frame 5 is provided with a support rod; the support rod is arranged parallel to the conveyor belt 43, and the top surfaces of the two are in the same horizontal plane. The fulcrum height of the support rod is consistent with the fulcrum height of the conveyor belt 43. The arrangement of the positioning frame 5 can reduce the number of transmission mechanisms 1 arranged and save equipment costs. The number of positioning frames 5 can be multiple, and can be arranged on the side or inside of multiple transmission mechanisms 1. Of course, it is necessary to open an air avoidance on the positioning frame 5 to avoid interference with the pipes during the jacking process. Optionally, a conveyor belt and a clamping block are arranged on the support rod, similar to the arrangement of the conveyor belt 43 and the blocking block 42. When the transmission mechanism 1 drives the pipeline to move laterally, it can simultaneously drive the conveyor belt and the clamping block to move, thereby improving the lateral limiting ability of the positioning frame 5 on the pipeline.

[0075] In addition, the transmission mechanism 1 includes a driver 11, a connecting rod 12 and a plurality of transmission gears; the plurality of transmission gears are sleeved on the connecting rod 12; the plurality of transmission gears mesh with the conveyor belts 43 of the plurality of conveying mechanisms 4 in a one-to-one correspondence and transmission; the driver 11 is connected to the connecting rod 12 and can drive the connecting rod 12 to rotate. The driver 11 is an electric motor or a motor, and the transmission gear meshes with the gear box of the conveyor belt 43 for transmission. In this embodiment, a total of three conveying mechanisms 4 are provided, and two lifting mechanisms 2 and two clamping mechanisms 3 are provided respectively. The specific number of settings can be set according to the length of the required processed pipe. The installation position of the lifting mechanism 2 is arranged along the longitudinal array to ensure the stability of the support. The three conveying mechanisms 4 are driven by the same transmission mechanism 1, and the synchronization stability is strong; for embodiments with a larger number of conveying mechanisms 4, multiple transmission mechanisms 1 can be provided, and each transmission mechanism 1 synchronously drives multiple conveying mechanisms 4, which can effectively improve the stability of the pipe feeding device in lateral conveying of the pipe.

[0076] It should be understood that the above description of the specific embodiments of the utility model is only for illustrating the technical route and features of the utility model, and its purpose is to enable those skilled in the art to understand the content of the utility model and implement it accordingly, but the utility model is not limited to the above specific implementation methods. All changes or modifications made within the scope of the claims of the utility model should be included in the protection scope of the utility model.

Claims

1. A pipe feeding device, characterized in that: The loading device comprises a transmission mechanism (1), a lifting mechanism (2), a clamping mechanism (3) and a plurality of conveying mechanisms (4); The plurality of conveying mechanisms (4) are arranged in parallel along the longitudinal direction; The plurality of conveying mechanisms (4) are connected to the transmission mechanism (1), and the transmission mechanism (1) is capable of synchronously driving the conveying belts (43) of the plurality of conveying mechanisms (4) to move in a lateral direction; Along the longitudinal direction, the lifting mechanism (2) and / or the clamping mechanism (3) is arranged between a pair of adjacent conveying mechanisms (4); The lifting mechanism (2) and the clamping mechanism (3) can both be lifted and lowered in a vertical direction.

2. The pipe feeding device according to claim 1, characterized in that: The lifting mechanism (2) comprises a lifting driver (21) and a lifting wheel (22); The telescopic rod of the lifting driver (21) is connected to the lifting wheel (22), and the lifting driver (21) can drive the lifting wheel (22) to rise and fall along the vertical direction; A concave slot (221) is provided on the side wall of the lifting wheel (22).

3. The pipe feeding device according to claim 2, characterized in that: The lifting mechanism (2) further comprises a supporting slide plate (23) and a positioning pin (24); the lifting wheel (22) is a variable diameter wheel; The supporting slide plate (23) is connected to the telescopic rod of the lifting drive (21), and the lifting drive (21) can drive the supporting slide plate (23) to rise and fall along the vertical direction; The diameter-changing wheel is rotatably connected to the supporting slide plate (23); The end surface of the diameter-changing wheel is provided with a plurality of plug-in holes (222) along its circumference; the side wall of the diameter-changing wheel is provided with the concave card slots (221) of a plurality of sizes, and the plurality of plug-in holes (222) are arranged in a one-to-one correspondence with the concave card slots (221) of a plurality of sizes; The supporting slide plate (23) is provided with a positioning hole, and the insertion hole (222) and the positioning hole are fixed via the positioning pin (24).

4. The pipe feeding device according to claim 2, characterized in that: The lifting drive (21) is a double-stage lifter; the double-stage lifter comprises a primary lifter and a secondary lifter (225); The telescopic rod of the primary lifter is connected to the secondary lifter (225); and the telescopic rod of the secondary lifter (225) is connected to the lifting wheel (22).

5. The pipe feeding device according to any one of claims 1 to 4, characterized in that: The clamping mechanism (3) comprises a lifting drive (31), a mounting slide plate (32), a roller assembly (33) and a clamp (34); The telescopic rod of the lifting drive (31) is connected to the mounting slide plate (32), and the lifting drive (31) can drive the mounting slide plate (32) to move up and down along the vertical direction; The roller assembly (33) and the clamp (34) are both mounted on the mounting slide plate (32); the clamp (34) is capable of clamping or releasing the roller assembly (33) along the axial direction.

6. The pipe feeding device according to claim 5, characterized in that: The roller assembly (33) comprises a supporting roller (331), a fixing frame (332), an adjusting screw (333) and a locking knob (334); The fixing frame (332) is slidably connected to the mounting slide plate (32) along the vertical direction; The supporting roller (331) is mounted on the fixing frame (332); The adjusting screw (333) is rotatably connected to the mounting slide (32) and is threadedly connected to the fixing frame (332); the adjusting screw (333) can drive the mounting slide (32) to rise and fall along the vertical direction by rotating. The adjusting screw (333) is threadedly connected to the mounting slide plate (32) so as to be able to abut against or move away from the adjusting screw (333); The clamp (34) is connected to the fixing frame (332).

7. The pipe feeding device according to claim 6, characterized in that: The fixing frame (332) is provided with a scale (3321), and the mounting slide plate (32) is provided with a pointer (321).

8. The pipe feeding device according to any one of claims 1 to 4, characterized in that: The conveying mechanism (4) further comprises a bracket (41) and a plurality of material blocking blocks (42); The conveyor belt (43) is installed on the bracket (41); along the transverse direction, a plurality of the blocking blocks (42) are arranged in an array on the conveyor belt (43).

9. The pipe feeding device according to claim 8, characterized in that: The feeding device further comprises a positioning frame (5); The positioning frame (5) is provided with a support rod; the support rod is arranged in parallel with the conveyor belt (43), and the top surfaces of the two are in the same horizontal plane.

10. The pipe feeding device according to any one of claims 1 to 4, characterized in that: The transmission mechanism (1) comprises a driver (11), a connecting rod (12) and a plurality of transmission gears; A plurality of transmission gears are sleeved on the connecting rod (12); The plurality of transmission gears mesh with the conveyor belts (43) of the plurality of conveying mechanisms (4) for transmission in a one-to-one correspondence; The driver (11) is connected to the connecting rod (12) and is capable of driving the connecting rod (12) to rotate.

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