Numerical control four-corner welding machine and method

Abstract

The invention provides a numerical control four-corner welding machine, and belongs to the field of plastic steel welding machines, the numerical control four-corner welding machine comprises a lathe bed, the lathe bed is connected with a left cross beam and a right cross beam which are parallel to each other, and the left cross beam and the right cross beam can slide in the X direction; the two ends of the left cross beam are each connected with a machine head, the two ends of the right cross beam are each connected with a machine head, and the four sets of machine heads can slide in the Y direction. The machine head comprises a machine head bottom plate, two pressing assemblies are symmetrically arranged on the machine head bottom plate, and a positioning assembly is slidably connected between the two pressing assemblies in the Z direction. A heating assembly is arranged on the machine head bottom plate and can be used for heating and melting the sectional material fixed by the pressing assembly; a milling assembly is further arranged on the machine head bottom plate, and welding slag can be milled; the left cross beam and the right cross beam are further provided with a feeding assembly for conveying the sectional materials to move in the Y direction. Through cooperation of the pressing assembly and the positioning assembly, welding seams of the upper plane and the lower plane are small V-shaped concave faces during welding, little welding slag is generated, the welding seams are uniform and attractive, and the machining efficiency is high.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic-steel welding machines, and in particular relates to a numerically controlled four-corner welding machine and a method. Background Art

[0002] With the development of real estate, in order to install doors and windows more efficiently and safely in house construction, plastic steel doors and windows with better cost performance are usually used for house door and window construction, which greatly increases the demand for plastic steel doors and windows. In order to effectively improve the production efficiency of plastic steel doors and windows, manufacturers usually use special plastic steel door and window welding machines for the final welding and assembly of plastic steel door and window frames.

[0003] At present, there are two welding forms in the welding process of plastic doors and windows, one is seamless welding and the other is seam welding. The current welding seams are 3mm and 2mm. For 3mm and 2mm welds, a corner cleaning machine is needed to clean the welds after welding. Processing must be performed on two devices. Secondary positioning is required during corner cleaning. The defects in welding quality and profile height difference are reflected in the upper and lower planes on the corner cleaning machine. The problems are: 1) The welds cleaned on the upper and lower planes are too wide, 3mm or 2mm, which is not beautiful. 2) Especially for coated and co-extruded colored profiles, the colored part is cleaned off after cleaning, revealing the white base material, which needs to be painted with a paint color similar to that of the colored profile; 3) The height difference defect of the profile leads to uneven weld cleaning; 4) Processing on multiple devices increases equipment investment, occupies a lot of manpower, and has low processing efficiency.

[0004] The weld cleaning of seamless welding is a blade shearing method. At the end of welding, the blade will shear off the welds on the upper and lower planes, which is highly efficient. However, the disadvantages of this welding method are: 1) The angle strength of the weld is not high, about 1800-2200kN, which is unacceptable to companies with high requirements for plastic steel doors and windows; 2) The shearing blade is shearing-type, with rigid contact, and the blade needs to be replaced after 2-3 months to achieve a better shearing effect. Summary of the invention

[0005] In order to solve the above problems in the prior art, a CNC four-corner welding machine and method are proposed.

[0006] The technical solution to solve the technical problem of the present invention is as follows: on the one hand, a CNC four-corner welding machine is proposed, comprising a bed, a left beam and a right beam parallel to each other are connected on the bed, and the left beam and the right beam can slide along the X direction; a machine head is connected to each end of the left beam, and each end of the right beam is also connected to a machine head, and four sets of machine heads can slide along the Y direction; the machine head comprises a machine head bottom plate, two clamping assemblies are symmetrically arranged on the machine head bottom plate, and a positioning assembly is connected between the two clamping assemblies along the Z direction, and the positioning assembly can be moved from the top surface and the bottom surface of the profile; a heating assembly is provided on the machine head bottom plate, and the profile fixed by the clamping assembly can be heated and melted; a milling assembly is also provided on the machine head bottom plate, and the welding slag can be milled; a feeding assembly for conveying the profile to move along the Y direction is also provided on the left and right beams.

[0007] Preferably, the two clamping assemblies are arranged perpendicular to each other, and the two clamping assemblies form an L-shaped structure; the clamping assembly includes an upper clamp and a lower clamp; the bottom of the lower clamp is connected to the first guide block, and the corresponding machine head bottom plate is connected to the working feed guide rail; the machine head bottom plate is fixedly connected to the working feed cylinder, and the telescopic end of the working feed cylinder is connected to the lower clamp, pushing the lower clamp and the first guide block to slide along the working feed guide rail; one side of the lower clamp is connected to the column, and the top of the column is connected to the clamping connecting plate, and the clamping cylinder is fixedly connected to the clamping connecting plate, and the telescopic end of the clamping cylinder is connected to the upper clamp, and the upper clamp can move along the Z direction, and the upper clamp and the lower clamp can cooperate to clamp the profile.

[0008] Preferably, the lower pressing clamp is connected to a pad plate, the inner side of the pad plate is in contact with the outer side of the profile, and the side of the upper pressing clamp is also connected to a material hook clamping cylinder, the telescopic end of the material hook clamping cylinder is connected to the material hook clamping plate, and when the upper and lower pressing clamps press the profile, the material hook clamping plate can move toward the profile pad plate to clamp the profile laterally.

[0009] Preferably, the heating assembly includes a welding positioning plate, the bottom of the welding positioning plate is connected to the second guide block, the corresponding machine head bottom plate is connected to the movable guide rail, the telescopic end of the movable cylinder fixed on the machine head bottom plate is connected to the welding positioning plate so that the welding positioning plate can move along the movable guide rail; a welding stand is tiltedly arranged on the positioning welding plate, the welding stand is connected to the welding lifting guide rail, and the welding lifting guide rail is slidably connected to the third guide block; the top of the welding stand is connected to the heating plate lifting cylinder, the telescopic end of the heating plate lifting cylinder is connected to the heating fixing seat, the bottom of the heating fixing seat is connected to the third guide block, and the heating fixing seat is connected to the heating plate.

[0010] Preferably, the welding positioning plate at the bottom of the heating plate is also slidably connected to a rear rounded corner pressure plate, which can be pressed on the welding point of the two profiles. The rear rounded corner pressure plate is connected to the seventh guide block and the corresponding welding positioning plate is connected to the feed screw. The rear rounded corner pressure plate is driven by the feed motor on the welding positioning plate to move along the feed screw.

[0011] Preferably, the milling assembly includes a milling stand connected to the welding positioning plate, the milling stand is connected to the milling front and rear feed guide rails, the milling front and rear feed guide rails are cooperatively connected to the sixth guide block, the sixth guide block is driven by the front and rear feed drive cylinder on the milling stand, the sixth guide block is connected to the sliding seat, the sliding seat is connected to the motor lifting cylinder, the telescopic end of the motor lifting cylinder is connected to the milling motor mounting plate, the milling motor mounting plate is connected to the milling motor, and the output end of the milling motor is connected to the milling cutter.

[0012] Preferably, the positioning assembly includes an upper positioning plate and a lower positioning plate, the lower positioning plate is vertically slidably connected to the machine head bottom plate, the top of the lower positioning plate is connected to the lower V-shaped pressure plate, the bottom is connected to the lower pressure plate cylinder, the lower pressure plate cylinder is connected to the positioning cylinder, the positioning cylinder is vertically slidably connected to the bottom of the machine head bottom plate, the machine head bottom plate and the positioning cylinder are connected by a positioning connection pair; the bottom of the sliding seat is transversely slidably connected to the upper positioning plate, the bottom of the upper positioning plate is connected to the upper V-shaped pressure plate, the end of the upper V-shaped pressure plate is connected to the pressure plate switching cylinder, and the pressure plate switching cylinder can drive the upper V-shaped pressure plate to move along the upper positioning plate.

[0013] Preferably, the feeding assembly includes a feeding belt, which is driven by a feeding drive motor fixed on the left crossbeam; a pushing cylinder is connected to the bottom plate of the machine head, the telescopic end of the pushing cylinder is connected to a pushing plate, a fourth guide block is connected to the pushing plate, and a pushing guide rail is connected to the corresponding machine head base, the fourth guide block cooperates with the pushing guide rail to achieve guiding, and the pushing plate can push the welded profile onto the feeding belt to achieve feeding.

[0014] Preferably, the bottom of the machine head base plate is connected to a fifth guide block, and the left crossbeam and the right crossbeam are respectively connected to a machine head moving guide rail, and the fifth guide block cooperates with the machine head moving guide rail to realize movement of the machine head along the Y direction.

[0015] On the other hand, a welding method of a CNC four-corner welding machine is proposed, comprising the following steps: S1. Debugging: adjust the distance between the left and right beams of the equipment to the required width of the profile discharge, and extend the positioning cylinder and the lower pressure plate cylinder at the same time, so that the positioning plate is exposed to the lower pressure clamp; S2. Loading; first place the profile between the left and right beams, and manually place both ends of the profile on the lower pressure clamp; then place the profile between the two heads on a single beam, and manually place the two profiles between the two heads on the left beam and between the two heads on the right beam; S3. Positioning and limiting; the working cylinder drives the clamping assembly along the working guide rail to press the welding surface of the profile against the two sides of the positioning plate; after positioning is completed, the upper clamping cylinder drives the upper clamp to clamp the profile, and at the same time the hook clamping cylinder pulls the hook clamping plate to clamp the profile to prevent the profile from running; finally, the positioning cylinder and the lower pressure plate cylinder retract, and the positioning plate retracts below the plane of the lower pressure clamp.

[0016] S4. Heating; After the positioning plate is retracted, the worker enters the cylinder and withdraws to the heating plate feeding position. The heating plate lifting cylinder drives the heating plate along the welding lifting rail to reach the heating position. The worker enters the cylinder and drives the profile close to the heating plate for heating; S5. Milling; the work cylinder drives the profile to exit, the heating plate is withdrawn from the inside of the profile, and then driven by the moving cylinder to switch to the milling position of the machine head. The positions of the milling motor and the milling cutter are adjusted by the front and rear feed drive cylinders and the motor lifting cylinder. The milling motor drives the milling cutter to complete the milling of the edge positions of the upper and lower surfaces and the rear step surface of the profile, and the excess welding slag is milled off to prevent too much welding slag from overflowing during welding. Then the work cylinder drives the profile to the milling head exit position, and the milling head exits to complete the milling process of welding slag; S6. Welding; the feed motor drives the rear fillet pressing plate to press the profile, the lower pressing plate cylinder extends, and the lower V-shaped pressing plate presses the lower surface of the profile to prevent the welding slag on the lower surface of the profile from overflowing from the lower surface of the profile; at the same time, the upper V-shaped pressing plate is driven by the pressing plate switching cylinder to extend to the pressing position to achieve the pressing of the upper V-shaped groove; S7. Material discharge; when the welding time is reached, the upper V-shaped pressing plate and the lower V-shaped pressing plate are retracted, and then the rear rounded corner pressing plate is withdrawn, and the left beam and the right beam move in the opposite direction; the pushing cylinder drives the pushing plate to push the profile out of the clamping assembly, and the profile falls onto the feeding belt, and the feeding belt conveys the welded profile out of the welding machine.

[0017] Compared with the prior art, the above technical solution has the following advantages or beneficial effects: 1. The present invention realizes that the weld seams of the upper and lower planes are small V-shaped concave surfaces during welding through the cooperation of the clamping assembly and the positioning assembly, and generates very little welding slag, and the weld seams are uniform and beautiful, with high processing efficiency.

[0018] 2. The present invention ensures that welding slag is unlikely to overflow from the welding surface through the cooperation of the upper positioning plate and the lower positioning plate as well as the upper V-shaped pressure plate and the lower V-shaped pressure plate. Compared with the operation of cutting off the weld in seamless welding, the present invention has greater strength and can be used directly without cleaning, thereby improving processing efficiency and reducing equipment investment and personnel occupation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0021] Figure 3 It is an isometric view of the aircraft nose.

[0022] Figure 4 This is the right side isometric view of the milling component and heating component.

[0023] Figure 5 It is the left side isometric view of the milling component and heating component part.

[0024] Description of reference numerals: 1. Operation box; 2. Machine head; 21. Machine head bottom plate; 22. Work feed guide rail; 23. Moving guide rail; 24. Moving cylinder; 25. Pushing guide rail; 26. Fifth guide block; 27. Machine head moving guide rail; 3. Electric control box; 4. Bed; 41. Left crossbeam; 42. Right crossbeam; 5. Profile; 6. Clamping assembly; 61. Upper clamp; 62. Lower clamp; 63. First guide block; 64. Work feed cylinder; 65. Column; 66. Connecting plate; 67. Clamping cylinder; 68. Pad plate; 69. Hooking clamping cylinder; 610. Hooking clamping plate; 7. Positioning assembly; 71. Lower positioning plate; 72. Upper positioning plate; 73. Lower V-type pressing plate; 74. Lower pressing plate cylinder; 75. Positioning cylinder; 76. Positioning connection pair; 77. Upper V-type pressing plate; 78. Pressing plate switching cylinder; 8 , heating assembly; 81, welding positioning plate; 82, second guide block; 83, welding stand; 84, welding lifting guide rail; 85, third guide block; 86, heating plate lifting cylinder; 87, heating fixing seat; 88, heating plate; 89, rear fillet pressure plate; 810, seventh guide block; 811, feed screw; 812, feed motor; 9, feeding assembly; 91, feeding belt; 92, feeding drive motor; 93, push cylinder; 94, push plate; 95, fourth guide block; 10, milling assembly; 101, milling stand; 102, milling front and rear feed guide rail; 103, sixth guide block; 104, front and rear feed drive cylinder; 105, sliding seat; 106, motor lifting cylinder; 107, milling motor mounting plate; 108, milling motor; 109, milling cutter. DETAILED DESCRIPTION

[0025] In order to clearly illustrate the technical features of the present solution, the present invention is described in detail below through specific implementation methods and in combination with the accompanying drawings. The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. It should be noted that the components illustrated in the accompanying drawings are not necessarily drawn to scale. The present invention omits the description of known components and processing technologies and processes to avoid unnecessary limitations on the present invention. The orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Embodiment 1: See also Figure 1-Figure 5 The present embodiment proposes a CNC four-corner welding machine, including a bed 4, on which a left crossbeam 41 and a right crossbeam 42 are connected in parallel, and the left crossbeam 41 and the right crossbeam 42 can slide along the X direction; a head 2 is connected to each end of the left crossbeam 41, and a head 2 is also connected to each end of the right crossbeam 42, and the four heads 2 can slide along the Y direction; the head 2 includes a head bottom plate 21, on which two clamping assemblies 6 are symmetrically arranged, and a positioning assembly 7 is connected between the two clamping assemblies 6 along the Z direction, and the positioning assembly 7 can be from the top and bottom surfaces of the profile 5; a heating assembly 8 is provided on the head bottom plate 21, which can heat and melt the profile 5 fixed by the clamping assembly 6; a milling assembly 10 is also provided on the head bottom plate 21, which can mill the welding slag; a feeding assembly 9 for conveying the profile 5 to move along the Y direction is also provided on the left crossbeam 41 and the right crossbeam 42.

[0027] Embodiment 2: Continue reading Figure 1-Figure 5On the basis of the first embodiment, in this embodiment, the two clamping assemblies 6 are arranged perpendicular to each other, and the two clamping assemblies 6 form an L-shaped structure; the clamping assembly 6 includes an upper clamp 61 and a lower clamp 62; the bottom of the lower clamp 62 is connected to the first guide block 63, and the corresponding machine head bottom plate 21 is connected to the working guide rail 22; the machine head bottom plate 21 is fixedly connected to the working cylinder 64, and the telescopic end of the working cylinder 64 is connected to the lower clamp 62, pushing the lower clamp 62 and the first guide block 63 to slide along the working guide rail 22; one side of the lower clamp 62 is connected to the column 65, and the top of the column 65 is connected to the clamping connecting plate 66, and the clamping connecting plate 66 is fixedly connected to the clamping cylinder 67, and the telescopic end of the clamping cylinder 67 is connected to the upper clamp 61, and the upper clamp 61 can move along the Z direction. The upper clamp 61 and the lower clamp 62 can cooperate to clamp the profile 5.

[0028] The lower pressing clamp 62 is connected to a pad block 68, the inner side of the pad block 68 is in contact with the outer side of the profile 5, and the side of the upper pressing clamp 61 is also connected to a material hook clamping cylinder 69, and the telescopic end of the material hook clamping cylinder 69 is connected to a material hook clamping plate 610. When the upper pressing clamp 61 and the lower pressing clamp 62 press the profile 5, the material hook clamping plate 610 can move toward the profile 5 pad to clamp the profile 5 laterally.

[0029] Embodiment three: Continue reading Figure 1-Figure 5 In this embodiment, the heating assembly 8 includes a welding positioning plate 81, the bottom of the welding positioning plate 81 is connected to the second guide block 82, the corresponding head bottom plate 21 is connected to the moving guide rail 23, the telescopic end of the moving cylinder 24 fixed on the head bottom plate 21 is connected to the welding positioning plate 81 so that the welding positioning plate 81 can move along the moving guide rail 23; a welding stand 83 is tiltedly arranged on the positioning welding plate, the welding stand 83 is connected to the welding lifting guide rail 84, and the welding lifting guide rail 84 is slidably connected to the third guide block 85; the top of the welding stand 83 is connected to the heating plate lifting cylinder 86, the telescopic end of the heating plate lifting cylinder 86 is connected to the heating fixing seat 87, the bottom of the heating fixing seat 87 is connected to the third guide block 85, and the heating fixing seat 87 is connected to the heating plate 88. After the profile 5 is pressed and fixed, since the lower positioning plate 71 reserves the space for the heating plate 88 to enter between the two profiles 5, when in use, the heating plate 88 can be moved in only after the lower positioning plate 71 is moved down.

[0030] The welding positioning plate 81 at the bottom of the heating plate 88 is also slidably connected to a rear rounded corner pressing plate 89, which can be pressed on the welding position of the two profiles 5. The rear rounded corner pressing plate 89 is connected to the seventh guide block 810, and the corresponding welding positioning plate 81 is connected to a feed screw 811. The rear rounded corner pressing plate 89 is driven by a feed motor 812 on the welding positioning plate 81 to drive the rear rounded corner pressing plate 89 to move along the feed screw 811. The rounded corner design of the edge when welding between the two profiles 5 is realized by the rear rounded corner pressing plate 89, and the rounded corner size can be changed by replacing the rounded corner pressing plate.

[0031] The milling assembly 10 and the heating assembly 8 of this embodiment are arranged together, and both are arranged on the welding positioning plate 81. The milling assembly 10 includes a milling stand 101 connected to the welding positioning plate 81, and the milling stand 101 is connected to the milling front and rear feed guide rails 102, and the milling front and rear feed guide rails 102 are matched with the sixth guide block 103, and the sixth guide block 103 is driven by the front and rear feed drive cylinder 104 on the milling stand 101. The sixth guide block 103 is connected to the sliding seat 105, and the sliding seat 105 is connected to the motor lifting cylinder 106. The telescopic end of the motor lifting cylinder 106 is connected to the milling motor mounting plate 107, and the milling motor mounting plate 107 is connected to the milling motor 108, and the output end of the milling motor 108 is connected to the milling cutter 109.

[0032] The positioning assembly 7 of this embodiment includes an upper positioning plate 72 and a lower positioning plate 71. The lower positioning plate 71 is vertically slidably connected to the machine head base plate 21. The top of the lower positioning plate 71 is connected to the lower V-shaped pressure plate 73, and the bottom is connected to the lower pressure plate cylinder 74. The lower pressure plate cylinder 74 is connected to the positioning cylinder 75. The positioning cylinder 75 is vertically slidably connected to the bottom of the machine head base plate 21. The machine head base plate 21 and the positioning cylinder 75 are connected by a positioning connection pair 76; the bottom of the sliding seat 105 is laterally slidably connected to the upper positioning plate 72, and the bottom of the upper positioning plate 72 is connected to the upper V-shaped pressure plate 77. The end of the upper V-shaped pressure plate 77 is connected to the pressure plate switching cylinder 78, and the pressure plate switching cylinder 78 can drive the upper V-shaped pressure plate 77 to move along the upper positioning plate 72.

[0033] Embodiment 4: Continue reading Figure 1-Figure 5 The feeding assembly 9 of this embodiment includes a feeding belt 91, which is driven by a feeding drive motor 92 fixed on the left crossbeam 41; a pushing cylinder 93 is connected to the head bottom plate 21, and the telescopic end of the pushing cylinder 93 is connected to a pushing plate 94, and a fourth guide block 95 is connected to the pushing plate 94, and a pushing guide rail 25 is connected to the corresponding head 2 base, and the fourth guide block 95 cooperates with the pushing guide rail 25 to achieve guidance, and the pushing plate 94 can push the welded profile 5 onto the feeding belt 91 to achieve feeding.

[0034] In addition, the fifth guide block 26 is connected to the bottom of the head base plate 21, and the left crossbeam 41 and the right crossbeam 42 are respectively connected to the head moving guide rail 27. The fifth guide block 26 cooperates with the head moving guide rail 27 to realize the movement of the head 2 along the Y direction.

[0035] Embodiment five: Based on the above embodiments, this embodiment proposes a welding method of a CNC four-corner welding machine, comprising the following steps: S1. Debugging; The control part in this embodiment includes an operation box 1 and an electric control box 3, and the electric control box 3 controls the power supply of the entire welding machine. By inputting the length and width of the window size on the operation box 1, the distance between the left crossbeam 41 and the right crossbeam 42 of the equipment is adjusted to the required width of the profile 5, and the positioning cylinder 75 and the lower pressure plate cylinder 74 are extended at the same time, so that the positioning plate is exposed to the lower pressure clamp 62; S2. Loading; first, place the profile 5 between the left beam 41 and the right beam 42, and manually place both ends of the profile 5 on the lower clamp 62; then place the profile 5 between the two heads 2 on a single beam, and manually place the two profiles 5 between the two heads 2 on the left beam 41 and between the two heads 2 on the right beam 42; S3. Positioning and limiting; the work cylinder 64 drives the clamping assembly 6 to press the welding surface of the profile 5 against the two sides of the positioning plate along the work guide rail 22; after the positioning is completed, the upper clamping cylinder 67 drives the upper clamp 61 to clamp the profile 5, and at the same time the hook clamping cylinder 69 pulls the hook clamping plate 610 to clamp the profile 5 to prevent the profile 5 from running; finally, the positioning cylinder 75 and the lower pressure plate cylinder 74 retract, and the positioning plate retracts to below the plane of the lower pressure clamp 62.

[0036] S4 heating; after the positioning plate is retracted, the worker into the cylinder 64 withdraws to reach the heating plate 88 feed position, the heating plate lifting cylinder 86 drives the heating plate 88 along the welding lifting rail 84 to reach the heating position, the worker into the cylinder 64 drives the profile 5 close to the heating plate 88, for heating; S5. Milling; the work cylinder 64 drives the profile 5 to withdraw, the heating plate 88 is withdrawn from the inside of the profile 5, and then driven by the moving cylinder 24, it switches to the milling position of the head 2, and adjusts the position of the milling motor 108 and the milling cutter 109 by the front and rear feed drive cylinders 104 and the motor lifting cylinder 106. The milling motor 108 drives the milling cutter 109 to complete the milling of the edge position of the upper and lower surfaces and the rear step surface of the profile 5, and the excess welding slag is milled off to prevent too much welding slag from overflowing during welding. Then the work cylinder 64 drives the profile 5 to the exit position of the milling head 2, and the milling head 2 exits to complete the milling process of the welding slag; S6 welding; the feed motor 812 drives the rear fillet pressing plate 89 to press the profile 5, the lower pressing plate cylinder 74 extends, and the lower V-shaped pressing plate 73 presses the lower surface of the profile 5 to prevent the welding slag from overflowing from the lower surface of the profile 5; at the same time, the upper V-shaped pressing plate 77 is driven by the pressing plate switching cylinder 78, and extends to the pressing position to achieve the pressing of the upper V-shaped groove; S7. Discharging; when the welding time is reached, the upper V-shaped pressing plate 77 and the lower V-shaped pressing plate 73 are retracted, and then the rear rounded corner pressing plate 89 is withdrawn, and the left crossbeam 41 and the right crossbeam 42 move in the opposite direction; the pushing cylinder 93 drives the pushing plate 94 to push the profile 5 out of the clamping assembly 6, and the profile 5 falls onto the feeding belt 91, and the feeding belt conveys the welded profile 5 out of the welding machine.

[0037] Although the above describes the specific implementation mode of the invention in conjunction with the drawings, it is not intended to limit the scope of protection of the invention. Based on the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. A CNC four-corner welding machine, characterized in that: The machine bed comprises a bed body (4), a left crossbeam (41) and a right crossbeam (42) which are parallel to each other are connected to the bed body (4), and the left crossbeam (41) and the right crossbeam (42) can slide along the X direction; two ends of the left crossbeam (41) are respectively connected to a machine head (2), and two ends of the right crossbeam (42) are also respectively connected to a machine head (2), and four sets of machine heads (2) can slide along the Y direction; the machine head (2) comprises a machine head bottom plate (21), and two pressure plates are symmetrically arranged on the machine head bottom plate (21). A clamping assembly (6), a positioning assembly (7) is slidably connected between the two clamping assemblies (6) along the Z direction; a heating assembly (8) is provided on the head bottom plate (21) and is capable of heating and melting the profile (5) fixed by the clamping assembly (6); a milling assembly (10) is also provided on the head bottom plate (21) and is capable of milling the welding slag; and a feeding assembly (9) is also provided on the left crossbeam (41) and the right crossbeam (42) and is capable of conveying the profile (5) to move along the Y direction.

2. A CNC four-corner welding machine according to claim 1, characterized in that: The two clamping assemblies (6) are arranged perpendicular to each other, and the two clamping assemblies (6) form an L-shaped structure; the clamping assembly (6) comprises an upper clamp (61) and a lower clamp (62); the bottom of the lower clamp (62) is connected to a first guide block (63), and the corresponding machine head bottom plate (21) is connected to a work feed guide rail (22); the machine head bottom plate (21) is fixedly connected to a work feed cylinder (64), and the telescopic end of the work feed cylinder (64) is connected to the lower clamp (62), pushing the lower clamp (6 2) and the first guide block (63) slide along the working guide rail (22); one side of the lower pressing clamp (62) is connected to the column (65), the top of the column (65) is connected to the clamping connecting plate (66), the clamping connecting plate (66) is fixedly connected to the clamping cylinder (67), the telescopic end of the clamping cylinder (67) is connected to the upper pressing clamp (61), the upper pressing clamp (61) can move along the Z direction, and the upper pressing clamp (61) and the lower pressing clamp (62) can cooperate to clamp the profile (5).

3. A CNC four-corner welding machine according to claim 2, characterized in that: The lower pressing clamp (62) is connected to a backing plate (68), and the inner side of the backing plate (68) is in contact with the outer side of the profile (5); the upper pressing clamp (61) is also connected to a hook material clamping cylinder (69) on its side, and the telescopic end of the hook material clamping cylinder (69) is connected to a hook material clamping plate (610), and while the upper pressing clamp (61) and the lower pressing clamp (62) press the profile (5), the hook material clamping plate (610) can move toward the backing plate of the profile (5) to clamp the profile (5) laterally.

4. A CNC four-corner welding machine according to claim 1, characterized in that: The heating assembly (8) comprises a welding positioning plate (81), the bottom of the welding positioning plate (81) is connected to a second guide block (82), the corresponding machine head bottom plate (21) is connected to a movable guide rail (23), the telescopic end of a movable cylinder (24) fixed to the machine head bottom plate (21) is connected to the welding positioning plate (81) so that the welding positioning plate (81) can move along the movable guide rail (23); a welding stand (83) is obliquely arranged on the positioning welding plate, the welding stand (83) is connected to a welding lifting guide rail (84), and the welding lifting guide rail (84) is slidably connected to a third guide block (85); the top of the welding stand (83) is connected to a heating plate lifting cylinder (86), the telescopic end of the heating plate lifting cylinder (86) is connected to a heating fixing seat (87), the bottom of the heating fixing seat (87) is connected to the third guide block (85), and the heating fixing seat (87) is connected to a heating plate (88).

5. A CNC four-corner welding machine according to claim 4, characterized in that: The welding positioning plate (81) at the bottom of the heating plate (88) is also slidably connected to a rear rounded corner pressing plate (89), which can be pressed on the welding position of the two profiles (5). The rear rounded corner pressing plate (89) is connected to the seventh guide block (810), and the corresponding welding positioning plate (81) is connected to a feed screw (811). The rear rounded corner pressing plate (89) is driven by a feed motor (812) on the welding positioning plate (81) to move along the feed screw (811).

6. A CNC four-corner welding machine according to claim 1, characterized in that: The milling assembly (10) comprises a milling stand (101) connected to a welding positioning plate (81); the milling stand (101) is connected to a milling front and rear feed guide rail (102); the milling front and rear feed guide rail (102) is cooperatively connected to a sixth guide block (103); the sixth guide block (103) is driven by a front and rear feed drive cylinder (104) on the milling stand (101); the sixth guide block (103) is connected to a sliding seat (105); the sliding seat (105) is connected to a motor lifting cylinder (106); the telescopic end of the motor lifting cylinder (106) is connected to a milling motor mounting plate (107); the milling motor mounting plate (107) is connected to a milling motor (108); and the output end of the milling motor (108) is connected to a milling cutter (109).

7. A CNC four-corner welding machine according to claim 6, characterized in that: The positioning assembly (7) comprises an upper positioning plate (72) and a lower positioning plate (71), wherein the lower positioning plate (71) is vertically slidably connected to the machine head bottom plate (21), the top of the lower positioning plate (71) is connected to the lower V-shaped pressure plate (73), and the bottom is connected to the lower pressure plate cylinder (74), the lower pressure plate cylinder (74) is connected to the positioning cylinder (75), the positioning cylinder (75) is vertically slidably connected to the bottom of the machine head bottom plate (21), and the machine head bottom plate (21) and the positioning cylinder (75) are connected via a positioning connection pair (76); the bottom of the sliding seat (105) is laterally slidably connected to the upper positioning plate (72), the bottom of the upper positioning plate (72) is connected to the upper V-shaped pressure plate (77), the end of the upper V-shaped pressure plate (77) is connected to the pressure plate switching cylinder (78), and the pressure plate switching cylinder (78) can drive the upper V-shaped pressure plate (77) to move along the upper positioning plate (72).

8. The CNC four-corner welding machine according to claim 1, characterized in that: The feeding assembly (9) comprises a feeding belt (91), and the feeding belt (91) is driven by a feeding drive motor (92) fixed on the left crossbeam (41); a pushing cylinder (93) is connected to the head bottom plate (21), and the telescopic end of the pushing cylinder (93) is connected to a pushing plate (94); the pushing plate (94) is connected to a fourth guide block (95), and a pushing guide rail (25) is connected to the corresponding head (2) base; the fourth guide block (95) cooperates with the pushing guide rail (25) to achieve guidance, and the pushing plate (94) can push the welded profile (5) onto the feeding belt (91) to achieve feeding.

9. The CNC four-corner welding machine according to claim 1, characterized in that: The bottom of the machine head bottom plate (21) is connected to a fifth guide block (26), and the left crossbeam (41) and the right crossbeam (42) are respectively connected to a machine head moving guide rail (27). The fifth guide block (26) cooperates with the machine head moving guide rail (27) to realize movement of the machine head (2) along the Y direction.

10. A welding method for a CNC four-corner welding machine according to any one of claims 1 to 9, characterized in that The following steps are involved: S1. Debugging; the distance between the left beam (41) and the right beam (42) of the equipment is adjusted to the required width of the profile (5) discharge, and the positioning cylinder (75) and the lower pressure plate cylinder (74) are extended at the same time so that the positioning plate is exposed from the lower pressure clamp (62); S2. Loading; first, place the profile (5) between the left beam (41) and the right beam (42), and manually place both ends of the profile (5) on the lower clamp (62); then place the profile (5) between the two heads (2) on a single beam, and manually place the two profiles (5) between the two heads (2) on the left beam (41) and between the two heads (2) on the right beam (42); S3. Positioning and limiting; the work cylinder (64) drives the clamping assembly (6) along the work guide rail (22) to press the welding surface of the profile (5) against the two sides of the positioning plate; after the positioning is completed, the upper clamping cylinder (67) drives the upper clamp (61) to clamp the profile (5), and at the same time the hook clamping cylinder (69) pulls the hook clamping plate (610) to clamp the profile (5) to prevent the profile (5) from running; finally, the positioning cylinder (75) and the lower clamping plate cylinder (74) retract, and the positioning plate retracts to below the plane of the lower clamp (62). S4. Heating; after the positioning plate is retracted, the worker cylinder (64) is withdrawn to reach the feeding position of the heating plate (88), the heating plate lifting cylinder (86) drives the heating plate (88) along the welding lifting guide rail (84) to reach the heating position, and the worker cylinder (64) drives the profile (5) close to the heating plate (88) for heating; S5. Milling; the work cylinder (64) drives the profile (5) to withdraw, the heating plate (88) is withdrawn from the inside of the profile (5), and then driven by the moving cylinder (24), switched to the milling position of the machine head (2), and the positions of the milling motor (108) and the milling cutter (109) are adjusted by the front and rear feed drive cylinders (104) and the motor lifting cylinder (106), and the milling motor (108) drives the milling cutter (109) to complete the milling of the edge position of the upper and lower surfaces and the rear step surface of the profile (5), and the welding slag is milled off to prevent the welding slag from overflowing during welding, and then the work cylinder (64) drives the profile (5) to the withdrawal position of the milling machine head (2), and the milling machine head (2) is withdrawn, completing the milling process of the welding slag; S6. Welding; the feed motor (812) drives the rear fillet pressing plate (89) to press the profile (5), the lower pressing plate cylinder (74) extends, and the lower V-shaped pressing plate (73) presses the lower surface of the profile (5) to prevent the welding slag on the lower surface of the profile (5) from overflowing from the lower surface of the profile (5); at the same time, the upper V-shaped pressing plate (77) is driven by the pressing plate switching cylinder (78) to extend to the pressing position to achieve the pressing of the upper V-shaped groove; S7. Discharging; when the welding time is reached, the upper V-shaped pressing plate (77) and the lower V-shaped pressing plate (73) are retracted, and then the rear rounded corner pressing plate (89) is withdrawn, and the left crossbeam (41) and the right crossbeam (42) move in the opposite direction; the pushing cylinder (93) drives the pushing plate (94) to push the profile (5) out of the clamping assembly (6), and the profile (5) falls onto the feeding belt (91), and the feeding belt (91) conveys the welded profile (5) out of the welding machine.

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