CN216862660U

CN216862660U - Square tube positioning and conveying mechanism

Info

Publication number: CN216862660U
Application number: CN202123299754.6U
Authority: CN
Inventors: 彭园春; 龙琼
Original assignee: Kunshan Xintongnuo Automation Equipment Co ltd
Current assignee: Kunshan Xintongnuo Automation Equipment Co ltd
Priority date: 2021-12-24
Filing date: 2021-12-24
Publication date: 2022-07-01
Anticipated expiration: 2031-12-24

Abstract

The utility model relates to a square tube positioning and conveying mechanism which comprises a rack, wherein a chain conveyor belt transversely arranged on the left side and the right side is arranged at the top of the rack, the chain conveyor belt is fixedly arranged on the rack through a chain base, a plurality of base plates are arranged on the chain conveyor belt at equal intervals, a jig for mounting a square tube is fixedly arranged on each base plate, and a cavity for placing the square tube is formed in the jig; the chain conveyer belt top erect the bottom with frame fixed connection's positioning fixture, positioning fixture can be to the square pipe location of passing through its below. The square pipe positioning and conveying mechanism is simple in operation, square pipe parts can be continuously clamped and conveyed without manual clamping, positioning and discharging, manual intervention is few, accurate positioning can be achieved through the positioning clamp in the square pipe part conveying process, matched trimming or inner angle chamfering equipment is convenient to machine the positioned square pipes, machining efficiency is greatly improved, the square pipe positioning and conveying mechanism is also suitable for batch machining of other pipe parts, and adaptability is high.

Description

Square tube positioning and conveying mechanism

Technical Field

The utility model relates to a square tube conveying and positioning device, in particular to a square tube positioning and conveying mechanism.

Background

In the field of manufacturing and processing, the processing of some sleeve parts is often involved, such as the internal corner chamfering or edge cutting processing of metal or nonmetal pipe parts such as square pipes and round pipes, and the processing of the pipe parts is usually carried out by a machine tool.

The inner angle chamfering and the trimming of the pipe parts can be accurately processed by the machine tool, but the machine tool can only clamp one product at a time and needs manual clamping and unloading by an operator, and the machine tool processing mode is difficult to meet the requirement on the working efficiency for processing pipe parts with a large number; the machine tool fixture is simple and convenient to clamp and machine round pipe parts, inconvenient to clamp square pipe parts, complicated to operate and capable of influencing machining efficiency due to the fact that the square pipe parts need to be clamped and fixed by a special positioning fixture.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a square tube positioning and conveying mechanism which is convenient for batch clamping and positioning of square tube parts.

In order to solve the technical problems, the utility model is realized by the following technical scheme: a square tube positioning and conveying mechanism comprises a rack, wherein a chain conveyor belt transversely arranged on the left side and the right side is arranged at the top of the rack, the chain conveyor belt is fixedly arranged on the rack through a chain base, a plurality of base plates are arranged on the chain conveyor belt at equal intervals, a jig for mounting a square tube is fixedly arranged on each base plate, a cavity with an opening at the top and the front end is arranged on the jig, and the square tube is placed in the cavity; the chain conveyer belt top erect the bottom with frame fixed connection's positioning fixture, positioning fixture can be to the accurate location of square pipe through its below.

Preferably, the chain conveyor belt consists of a driven sprocket and a driving sprocket which are arranged in bilateral symmetry and a conveying chain matched with the outer parts of the driven sprocket and the driving sprocket, and the base plate is fixedly arranged on the outer peripheral surface of the conveying chain; the driven chain wheel and the driving chain wheel are respectively movably connected to the chain base through a driven shaft and a driving shaft, and the driven shaft and the driving shaft both extend out of the front end of the chain base; the outer part of the driving shaft close to the front end of the driving shaft is sleeved with a ratchet wheel fixedly connected with the driving shaft, the part of the driving shaft, which is positioned outside the front end of the ratchet wheel, is connected with a rocker, one end of the rocker, which corresponds to the driving shaft, is movably connected with the driving shaft through a bearing, and the other end of the rocker is in transmission connection with a driving cylinder fixedly arranged on a rack through a fisheye bearing; the rocker is movably connected with a pawl capable of being matched with the ratchet wheel in a clamping mode through an elastic pin shaft, the driving cylinder can drive the rocker to swing up and down through the fisheye bearing, the ratchet wheel is pushed through the pawl connected to the rocker, stepping movement of the ratchet wheel is achieved, and the driving shaft is driven to rotate through the ratchet wheel.

Preferably, a positioning wheel is fixedly arranged at the front end of the driven shaft, a plurality of positioning holes are formed in the front end face of the positioning wheel in a circular array with the center of the end face as the circle center, a first positioning cylinder corresponding to the positioning wheel in the front-back direction is fixedly arranged on the rack, a positioning column capable of stretching and retracting back and forth is in transmission connection with the first positioning cylinder, and the positioning column corresponds to one positioning hole in the front-back direction and can be matched with the positioning hole in an inserting mode.

Preferably, the positioning fixture comprises a support, the bottom of the support is fixedly connected to the top of the frame, an upper plate and a lower plate which are parallel to each other up and down and correspond to each other are fixedly arranged on the support, the upper plate is positioned above the top of the chain conveyor belt, the lower plate is positioned between the chain conveyor belts, two groups of supporting bearings which are symmetrically arranged front and back are arranged at the top of the lower plate, the two groups of supporting bearings are respectively positioned on the front side and the back side of the chain conveyor belt, and the top of the supporting bearings is in left-right rolling fit with the bottom of the passing base plate; the vertical downward second location cylinder of piston rod is fixed to be provided with on the upper plate, the terminal fixedly connected with clamp plate of piston rod of second location cylinder, the clamp plate is between upper plate and chain conveyer belt, the clamp plate with support bearing corresponds from top to bottom, and its left and right sides symmetry is provided with the side limiting plate of two vertical settings, interval between two side limiting plates and the width about being greater than the tool, side limiting plate bottom is provided with side location bearing, and side location bearing on two side limiting plates can respectively with the side about the tool roll cooperation from top to bottom.

Preferably, a substrate positioning bearing which is matched with the rear end face of the substrate in a rolling manner in the left-right direction is arranged at the rear side of the chain conveyor on the lower plate, and the substrate positioning bearing corresponds to the pressing plate up and down.

Preferably, the part of the pressing plate corresponding to the top surface of the jig is provided with a connecting hole which is communicated up and down, a T-shaped pressing rod which can be movably matched with the connecting hole up and down is arranged in the connecting hole in a penetrating manner, a soft rubber pressing block is fixedly arranged at the bottom of the pressing rod, and a buffering spring is sleeved on the part, between the pressing plate and the soft rubber pressing block, of the pressing rod.

Preferably, two guide pillars are vertically arranged on the front side and the rear side of the second positioning cylinder, the bottoms of the guide pillars penetrate through guide holes preset in the upper plate to be fixedly connected with the pressing plate, and the guide pillars are in up-and-down sliding fit with the guide holes.

Preferably, a chain stay is arranged on the top surface of the lower plate corresponding to the chain conveyor belt, a jacking cylinder with a vertically upward piston rod is fixedly arranged on the bottom surface of the lower plate, and the piston rod of the jacking cylinder penetrates through a preset engagement hole in the lower plate upwards to be fixedly connected with the chain stay.

Preferably, the jacking cylinders are arranged in a bilateral symmetry mode.

Preferably, a downward inclined material receiving slide way is fixedly arranged at the position, corresponding to the left end of the chain conveyor belt up and down, of the left side of the rack.

Compared with the prior art, the utility model has the advantages that: the square pipe positioning and conveying mechanism is simple in operation, square pipe parts can be continuously clamped and conveyed without manual clamping, positioning and discharging, manual intervention is few, accurate positioning can be achieved through the positioning clamp in the square pipe part conveying process, matched trimming or inner angle chamfering equipment is convenient to machine the positioned square pipes, machining efficiency is greatly improved, the square pipe positioning and conveying mechanism is also suitable for batch machining of other pipe parts, and adaptability is high.

Drawings

The utility model is further described below with reference to the accompanying drawings.

FIG. 1 is a schematic view of a front perspective structure of a square tube positioning and conveying mechanism of the present invention;

FIG. 2 is an enlarged view of A in FIG. 1;

FIG. 3 is a schematic view of a back side three-dimensional structure of the square tube positioning and conveying mechanism of the utility model;

FIG. 4 is a schematic structural diagram of the front side of the square pipe positioning and conveying mechanism of the utility model;

fig. 5 is an enlarged view of the structure B in fig. 4.

In the figure: 1. a frame; 11. a chain base; 12. a receiving chute; 2. a chain conveyor; 21. a conveyor chain; 22. a drive sprocket; 23. a driven sprocket; 24. a substrate; 25. a jig; 251. a cavity; 26. a support bearing; 27. a substrate positioning bearing; 3. positioning wheels; 4. a first positioning cylinder; 5. positioning a clamp; 51. a support; 511. an upper plate; 512. a lower plate; 52. a second positioning cylinder; 521. a guide post; 53. pressing a plate; 54. pressing the soft rubber blocks; 541. a pressure lever; 542. a buffer spring; 55. a side limiting plate; 551. a side locating bearing; 6. a driving cylinder; 61. a fisheye bearing; 7. a ratchet wheel; 71. a rocker; 72. a pawl.

Detailed Description

The utility model is described in detail below with reference to the following figures and embodiments:

the square pipe positioning and conveying mechanism shown in fig. 1 and 3 comprises a frame 1, wherein a chain conveyor belt 2 transversely arranged at the left and right is arranged at the top of the frame 1, the chain conveyor belt 2 is fixedly arranged on the frame 1 through a chain base 11, a plurality of base plates 24 are arranged on the chain conveyor belt 2 at equal intervals, a jig 25 for mounting a square pipe is fixedly arranged on each base plate 24, a cavity 251 with an opening at the top and the front end is arranged on the jig 25, and the square pipe is placed in the cavity 251; the chain conveyor 2 top erect the bottom with 1 fixed connection's of frame positioning fixture 5, positioning fixture 5 can be to the accurate location of square pipe through its below.

In order to facilitate the chain conveyor belt 2 to realize stepping movement, the chain conveyor belt 2 is composed of a driven sprocket 23 and a driving sprocket 22 which are arranged in bilateral symmetry and a conveying chain 21 which is matched with the outer parts of the driven sprocket 23 and the driving sprocket 22, and the base plate 24 is fixedly arranged on the outer peripheral surface of the conveying chain 21; the driven chain wheel 23 and the driving chain wheel 22 are respectively movably connected to the chain base 11 through a driven shaft and a driving shaft, and the driven shaft and the driving shaft both extend out of the front end of the chain base 11; the outer part of the driving shaft close to the front end of the driving shaft is sleeved with a ratchet wheel 7 fixedly connected with the driving shaft, the part of the driving shaft, which is positioned at the outer side of the front end of the ratchet wheel 7, is connected with a rocker 71, one end of the rocker 71, which corresponds to the driving shaft, is movably connected with the driving shaft through a bearing, and the other end of the rocker 71 is in transmission connection with a driving cylinder 6 fixedly arranged on the rack 1 through a fisheye bearing 61; the rocker 71 is movably connected with a pawl 72 capable of being matched with the ratchet wheel 7 in a clamping mode through an elastic pin shaft, the driving cylinder 6 can drive the rocker 71 to swing up and down through the fisheye bearing 61, the pawl 72 connected to the rocker 71 pushes the ratchet wheel 7, stepping movement of the ratchet wheel 7 is achieved, and the driving shaft is driven to rotate through the ratchet wheel 7.

In order to facilitate further positioning after the chain conveyor belt 2 stops, the driven chain wheel 23 is placed to rotate, the positioning wheel 3 is fixedly arranged at the front end of the driven shaft, a plurality of positioning holes are formed in the circular array of the front end face of the positioning wheel 3 by taking the center of the end face as the circle center, the first positioning air cylinder 4 corresponding to the positioning wheel 3 in the front and back direction is fixedly arranged on the rack 1, a positioning column capable of stretching and moving back and forth is connected to the first positioning air cylinder 4 in a transmission mode, and the positioning column corresponds to one of the positioning holes in the front and back direction and can be matched with the positioning holes in an inserted mode.

As shown in fig. 2 and 5, in order to position the jig 2 passing through the lower part of the positioning fixture 5 in the left-right direction, the positioning fixture 5 includes a bracket 51 fixedly connected to the top of the frame 1 at the bottom, an upper plate 511 and a lower plate 512 which are parallel to each other and correspond to each other are fixedly arranged on the bracket 51, the upper plate 511 is located above the top of the chain conveyor 2, the lower plate 512 is located between the chain conveyors 2, two sets of support bearings 26 are symmetrically arranged at the top of the lower plate 512 in the front-back direction, the two sets of support bearings 26 are respectively located at the front and back sides of the chain conveyor 2, and the top of the support bearings is in left-right rolling fit with the bottom of the passing base plate 24; the upper plate 511 is fixedly provided with a second positioning cylinder 52 with a piston rod vertically downward, the tail end of the piston rod of the second positioning cylinder 52 is fixedly connected with a pressing plate 53, the pressing plate 53 is arranged between the upper plate 511 and the chain conveyor belt 2, the pressing plate 53 vertically corresponds to the supporting bearing 26, the left side and the right side of the pressing plate 53 are symmetrically provided with two vertically arranged side limiting plates 55, the distance between the two side limiting plates 55 is larger than the left width and the right width of the jig 25, the bottom of each side limiting plate 55 is provided with a side positioning bearing 551, and the side positioning bearings 551 on the two side limiting plates 55 can be respectively in up-down rolling fit with the left side surface and the right side surface of the jig 25.

In order to guide and position the rear end of the substrate 24 located below the positioning fixture 5, a substrate positioning bearing 27 is disposed on the lower plate 512 at the rear side of the chain conveyor 2 and is in rolling engagement with the rear end face of the substrate 24 in the left-right direction, and the substrate positioning bearing 27 corresponds to the pressing plate 53 in the up-down direction.

In order to position the top of the square tube in the positioning fixture 5 and prevent the square tube from deforming due to pressure, the pressing plate 53 is provided with a connecting hole which is communicated up and down at a position corresponding to the top surface of the jig 25, a T-shaped pressing rod 541 which is movably matched with the connecting hole up and down is arranged in the connecting hole in a penetrating manner, the bottom of the pressing rod 541 is fixedly provided with a soft rubber pressing block 54, and a buffer spring 542 is sleeved at a position, between the pressing plate 53 and the soft rubber pressing block 54, of the pressing rod 541.

In order to ensure the stability of the pressure plate 53 during the up-and-down movement, two guide posts 521 vertically arranged are symmetrically arranged on the front side and the rear side of the second positioning cylinder 52, the bottoms of the guide posts 521 penetrate through a guide hole preset on the upper plate 511 to be fixedly connected with the pressure plate 53, and the guide posts 521 are in up-and-down sliding fit with the guide hole.

As shown in fig. 4, in order to ensure the balance of the vertical stress of the chain conveyor belt while applying an acting force to the jig and the square pipe by the positioning fixture 5, and prevent the chain conveyor belt from deforming in a single-sided stress manner, a chain stay 81 is disposed at a position of the top surface of the lower plate 512 corresponding to the chain conveyor belt 2, a jacking cylinder 8 with a vertically upward piston rod is fixedly disposed at the bottom surface of the lower plate 512, and the piston rod of the jacking cylinder 8 upwardly penetrates through a preset engagement hole on the lower plate 512 to be fixedly connected with the chain stay 81.

In order to ensure the stability of the jacking of the chain stay 81, the jacking cylinders 8 are provided with two left-right symmetrical devices.

In order to facilitate the falling of the square pipes in the jig 25 on the chain conveyor belt 2 into the designated material box, a downward-inclined material receiving slide way 12 is fixedly arranged at the position, corresponding to the left end of the chain conveyor belt 2, of the left side of the rack 1 from top to bottom.

The specific working mode is as follows: the square pipe parts are placed in a cavity 251 of a jig 25 at the top of the right end of the chain conveyor belt 2, the jig 25 with the square pipe parts is moved from right to left through the chain conveyor belt 2, the chain conveyor belt 2 rotates, the driving mechanism is driven by a driving chain wheel 22, the driving wheel 22 is fixedly connected with a driving shaft, a rocker 71 at the front end of the driving shaft is driven by a driving cylinder 6 to swing up and down by taking the end face center of the driving shaft as an axis, pawls 72 arranged on the rocker 71 move synchronously when the rocker 71 swings, the pawls 72 can push ratchet wheels 7 corresponding to the pawls to rotate in a stepping mode in the anticlockwise direction, the ratchet wheels 7 drive the driving shaft to rotate synchronously, the driving shaft further drives the driving chain wheel 22 to rotate synchronously, and the driving chain wheel 22 drives a transmission chain 21 outside the driving chain wheel to rotate synchronously from right to left by matching with a driven wheel 23, so that the rotation of a chain transmission belt 2 is realized; the chain conveyor belt 2 moves from left to right, the jig 25 provided with the square pipe is driven to move synchronously, when the jig 25 provided with the square pipe enters the position of the positioning clamp 5, the driving cylinder 6 stops moving, the chain conveyor belt 2 stops moving, meanwhile, the positioning column on the first positioning cylinder 4 extends forwards and is inserted into a corresponding positioning hole, the positioning wheel 3 is positioned through the positioning column, and then the driven shaft is positioned through the positioning wheel 3, so that the driven chain wheel 23 is prevented from rotating; then the jacking cylinder 8 jacks up the chain stay 81 to enable the conveying chain 21 above the chain stay 81 to be upwards propped up, meanwhile, the second positioning cylinder 52 drives the pressing plate 53 at the bottom of the second positioning cylinder to be downwards, the side limiting plates 55 provided with side positioning bearings 551 at the left side and the right side of the bottom of the pressing plate 53 are clamped at the left side and the right side of the jig 25 provided with the square pipe, so that the limiting of the left side and the right side of the jig 25 is realized, and meanwhile, the top surface of the square pipe is jacked through the soft rubber pressing block 54 to realize the positioning work of the top of the square pipe; the positioned square tube is processed through processing equipment, such as an edge cutting device or an inner angle chamfering device, arranged on the outer side of the front face of the positioning clamp 5, so that the position stability of the square tube during processing is ensured, and the processing precision of the square tube is further ensured; after the square tube is machined, the second positioning cylinder 52 drives the pressing plate 53 to reset upwards, so that the substrate positioning bearing 27 is separated from the jig 25, the first positioning cylinder 4 drives the positioning column to contract and reset, the positioning column is separated from the positioning wheel 3, the jacking cylinder 8 drives the chain stay 81 to reset downwards, the chain stay 21 is separated from the conveying chain 21, then the driving cylinder 6 continues to drive the driving chain wheel 22 to drive the conveying chain 21 to move in a stepping mode, the machined square tube moves leftwards along with the chain conveying belt 2 and leaves the position of the positioning clamp 5, meanwhile, the square tube to be machined on the rear jig 25 can be located in the positioning clamp 5, the positioning and machining actions are repeated, the square tube parts arranged on the jig 25 are machined in a stepping mode sequentially, the square tube which moves to the leftmost end along with the chain conveying belt 2 after machining can automatically fall down due to gravity when the conveying chain 21 rotates downwards and fall into the material receiving slide 12 corresponding to the lower side, the material receiving frame or the conveyer belt can be placed below the material receiving slide way 12, so that the processed square pipe parts can be conveniently collected or conveyed.

The square pipe positioning and conveying mechanism is simple in operation, square pipe parts can be continuously clamped and conveyed without manual clamping, positioning and discharging, manual intervention is few, accurate positioning can be achieved through the positioning clamp in the square pipe part conveying process, matched trimming or inner angle chamfering equipment is convenient to machine the positioned square pipes, machining efficiency is greatly improved, the square pipe positioning and conveying mechanism is also suitable for batch machining of other pipe parts, and adaptability is high.

It is to be emphasized that: the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims

1. The utility model provides a square pipe location conveying mechanism which characterized in that: the square tube mounting device is provided with a rack (1), wherein the top of the rack (1) is provided with a chain conveyor belt (2) which is transversely arranged at the left and right sides, the chain conveyor belt (2) is fixedly arranged on the rack (1) through a chain base (11), a plurality of base plates (24) are arranged on the chain conveyor belt (2) at equal intervals, a jig (25) for mounting a square tube is fixedly arranged on each base plate (24), a cavity (251) with an opening at the top and the front end is arranged on each jig (25), and the square tube is placed in the cavity (251); the chain conveyor belt (2) top erect the bottom with frame (1) fixed connection's positioning fixture (5), positioning fixture (5) can be to the accurate location of square pipe through its below.

2. The square tube positioning and conveying mechanism according to claim 1, wherein: the chain conveyor belt (2) consists of a driven sprocket (23) and a driving sprocket (22) which are arranged in bilateral symmetry and a conveying chain (21) matched with the outer parts of the driven sprocket (23) and the driving sprocket (22), and the base plate (24) is fixedly arranged on the outer peripheral surface of the conveying chain (21); the driven chain wheel (23) and the driving chain wheel (22) are movably connected to the chain base (11) through a driven shaft and a driving shaft respectively, and the driven shaft and the driving shaft extend to the outer side of the front end of the chain base (11); the outer part of the driving shaft close to the front end of the driving shaft is sleeved with a ratchet wheel (7) fixedly connected with the driving shaft, the part of the driving shaft, which is positioned on the outer side of the front end of the ratchet wheel (7), is connected with a rocker (71), one end of the rocker (71), which corresponds to the driving shaft, is movably connected with the driving shaft through a bearing, and the other end of the rocker is in transmission connection with a driving cylinder (6) fixedly arranged on the rack (1) through a fisheye bearing (61); the rocker (71) is movably connected with a pawl (72) capable of being matched with the ratchet wheel (7) in a clamping mode through an elastic pin shaft, the driving cylinder (6) can drive the rocker (71) to swing up and down through the fisheye bearing (61), the pawl (72) connected to the rocker (71) pushes the ratchet wheel (7), stepping movement of the ratchet wheel (7) is achieved, and the driving shaft is driven to rotate through the ratchet wheel (7).

3. The square tube positioning and conveying mechanism according to claim 2, wherein: the driven shaft front end is fixed with locating wheel (3), and the preceding terminal surface of locating wheel (3) uses its terminal surface center to have a plurality of locating holes as centre of a circle circular array, fixed being provided with on frame (1) with locating wheel (3) front and back corresponding first positioning cylinder (4), transmission connection has the reference column that can flexible activity around can on first positioning cylinder (4), this reference column with the position front and back correspondence of one of them locating hole and can with the locating hole cooperation of pegging graft.

4. The square tube positioning and conveying mechanism according to claim 1, wherein: the positioning fixture (5) comprises a support (51) with the bottom fixedly connected to the top of the rack (1), an upper plate (511) and a lower plate (512) which are parallel up and down and correspond to each other are fixedly arranged on the support (51), the upper plate (511) is positioned above the top of the chain conveyor belt (2), the lower plate (512) is positioned between the chain conveyor belts (2), two groups of supporting bearings (26) which are symmetrically arranged front and back are arranged on the top of the lower plate (512), the two groups of supporting bearings (26) are respectively positioned on the front side and the rear side of the chain conveyor belt (2), and the top of the supporting bearings is in left-right rolling fit with the bottom of the passing base plate (24); the upper plate (511) is fixedly provided with a second positioning cylinder (52) with a piston rod vertically downward, the tail end of the piston rod of the second positioning cylinder (52) is fixedly connected with a pressing plate (53), the pressing plate (53) is arranged between the upper plate (511) and the chain conveyor belt (2), the pressing plate (53) corresponds to the supporting bearing (26) up and down, the left side and the right side of the pressing plate are symmetrically provided with two vertically arranged side limiting plates (55), the distance between the two side limiting plates (55) is larger than the left width and the right width of the jig (25), the bottom of each side limiting plate (55) is provided with a side positioning bearing (551), and the side positioning bearings (551) on the two side limiting plates (55) can be respectively in up-and-down rolling fit with the left side and the right side of the jig (25).

5. The square tube positioning and conveying mechanism according to claim 4, wherein: and a substrate positioning bearing (27) which is matched with the rear end surface of the substrate (24) in a left-right direction in a rolling manner is arranged at the rear side part of the chain conveyor belt (2) on the lower plate (512), and the substrate positioning bearing (27) corresponds to the pressing plate (53) up and down.

6. The square tube positioning and conveying mechanism according to claim 4, wherein: the clamp plate (53) is provided with a connecting hole which is communicated up and down at a position corresponding to the top surface of the jig (25), a T-shaped pressing rod (541) which can be movably matched with the clamp plate up and down is arranged in the connecting hole in a penetrating manner, a soft rubber pressing block (54) is fixedly arranged at the bottom of the pressing rod (541), and a buffer spring (542) is sleeved at a position between the clamp plate (53) and the soft rubber pressing block (54) on the pressing rod (541).

7. The square tube positioning and conveying mechanism according to claim 4, wherein: two guide posts (521) which are vertically arranged are symmetrically arranged on the front side and the rear side of the second positioning cylinder (52), the bottoms of the guide posts (521) penetrate through guide holes which are preset in an upper plate (511) and are fixedly connected with the pressing plate (53), and the guide posts (521) are in up-and-down sliding fit with the guide holes.

8. The square tube positioning and conveying mechanism according to claim 4, wherein: the position of hypoplastron (512) top surface corresponding chain conveyor (2) is provided with chain stay (81), and hypoplastron (512) bottom surface is fixed and is provided with piston rod vertical ascending jacking cylinder (8), the piston rod of jacking cylinder (8) upwards pass hypoplastron (512) on preset the interlock hole with chain stay (81) fixed connection.

9. The square tube positioning and conveying mechanism according to claim 8, wherein: the jacking cylinders (8) are arranged in a bilateral symmetry mode.

10. The square tube positioning and conveying mechanism according to claim 1, wherein: the receiving chute (12) which inclines downwards is fixedly arranged at the position, corresponding to the left end of the chain conveyor belt (2) from top to bottom, of the left side of the rack (1).