Straight profile laser cutting positioning device based on three-jaw chuck

Abstract

The straight profile laser cutting positioning device based on the three-jaw chuck comprises a reference chuck, grooves are symmetrically formed in the top and the middle of the reference chuck, a leveling mechanism is installed at a notch in the top of the reference chuck, and the leveling mechanism is composed of an upper positioning reference clamping block, a leveling clamping block, an adjusting bolt and a puller bolt. The base is fixed in a notch in the top of the reference chuck through a cushion block, a bolt and a nut; an alignment mechanism is mounted in a notch in the middle of the reference chuck, consists of a rotating rod, a rotating boss, an alignment block, a connecting rod A, a connecting rod B, a connecting rod C and a connecting rod D, and is fixed in the notch in the middle of the reference chuck through a fixed flat plate and a fixed rotating shaft; a telescopic bracket is mounted below the fixed flat plate in the alignment mechanism, consists of a pair of straight gears, a connecting rod E, a connecting rod F, a connecting rod G and a connecting rod H, is mounted at the bottom of the reference chuck through a rotating shaft and a rotating nut, and is connected with the fixed flat plate in the alignment mechanism through a bolt; the top of the fixed flat plate in the alignment mechanism is provided with the jacking mechanism, and the jacking mechanism is composed of a sliding block, a spring and a top cap and is connected with the fixed flat plate in the alignment mechanism through a bolt. According to the laser cutting positioning device, the height difference between the two ends of the leveling clamping block is finely adjusted through an adjusting bolt in the leveling mechanism, so that the xy plane of the laser cutting positioning device is adjusted to be parallel to the xy plane of a laser cutting machine; the distance between the two alignment blocks is changed through a rotating rod in the alignment mechanism, so that the center position of the straight profile placed on the laser cutting machine is adjusted, and the axis, in the length direction, of the straight profile is parallel to the x axis of the laser cutting machine. A straight gear is rotated through a rotating nut in a telescopic support, and the height position of a fixed flat plate in the alignment mechanism in a notch in the middle of the reference chuck is adjusted; through the horizontal movement of the sliding block of the jacking mechanism and the stretching and retracting of the spring, the straight profile is clamped in the laser cutting positioning device. The laser cutting device is suitable for laser cutting of straight sectional materials with different section shapes, accurate positioning of the straight sectional materials on the laser cutting machine along all coordinate axes is achieved, and the cutting precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of laser cutting, and in particular to a straight profile laser cutting positioning device based on a three-jaw chuck. Background Art

[0002] Laser cutting technology has the advantages of high cutting accuracy and fast cutting speed. In my country, this technology has developed rapidly. At the same time, through linkage with five-axis machine tools, it can achieve precise cutting of multi-curvature parts. The corresponding five-axis machine tools are also equipped in large quantities in my country. Therefore, in a wide range of industrial production processes, laser cutting positioning and clamping devices are needed to cut industrial products.

[0003] At present, the laser cutting of super-long straight profile parts usually adopts the cutting method of three-point positioning tooling. However, the three-point acquisition is very easy to produce deviations when the linear span of the points is large; secondly, the cutting tooling also requires cumbersome buckles to fasten the parts, resulting in frequent knife avoidance in the cutting path; the traditional three-jaw chuck structure is generally for pipes or profiles with specific cross-sectional shapes, and cannot accurately locate the profile plane. Therefore, a laser cutting positioning method and corresponding clamping tooling are needed to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to remedy the deficiencies of the prior art and to provide a straight profile laser cutting positioning device based on a three-jaw chuck.

[0005] The present invention provides a straight profile laser cutting positioning device based on a three-jaw chuck, comprising: two reference chucks 1, two upper positioning reference blocks 2, two leveling blocks 3, adjusting bolts 4, tightening bolts 5, two fixed plates 7, two fixed rotating shafts 8, a rotating rod 9, a rotating boss 10, an alignment block 11, a connecting rod A12, a connecting rod B13, a connecting rod C14, a connecting rod D15, a telescopic bracket, a slider 23, a spring 24, and a top cap 25;

[0006] The cross-sectional shape of each reference chuck 1 is a regular hexagon, with protrusions provided on three non-adjacent sides, and a groove provided in the middle of the protrusion, the groove being used to clamp the claws of the three-claw chuck 200;

[0007] Two reference chucks 1 are arranged in parallel, two top notches are provided on the top of the reference chuck 1, a middle notch is provided in the middle, two long strip guide grooves are provided on both sides of the middle notch, and upper positioning reference blocks 2 are inserted into the top notches of the two reference chucks 1 that are located opposite to each other;

[0008] Two leveling blocks 3 are respectively arranged outside the two reference chucks 1 and below the upper positioning reference block 2; the upper parts of both ends of the upper positioning reference block 2 are respectively provided with adjusting bolts 4 and tightening bolts 5, the adjusting bolts 4 are used to adjust the height of both ends of the leveling block 3, and the tightening bolts 5 are used to fix the height of the leveling block 3; both ends of the leveling block 3 are provided with extension planes for the laser head of the laser cutting machine to perform height sampling;

[0009] The two fixed plates 7 are fixedly connected by two fixed shafts 8, and each fixed shaft 8 moves up and down in two guide grooves at opposite positions; one end of the spring 24 is connected to the top cap 25, and the other end is connected to the slider 23, the slider 23 is connected to the upper end of the fixed plate 7, and the straight profile is clamped between the top cap 25 and the leveling block 3;

[0010] A telescopic bracket is installed under each fixed plate 7, and the telescopic bracket includes: a spur gear A16, a spur gear B17, a connecting rod E18, a connecting rod F19, a connecting rod G20, a connecting rod H21, and a rotating nut 22;

[0011] The connecting rod E18 and the connecting rod F19, the connecting rod G20 and the connecting rod H21, the connecting rod F19 and the fixed plate 7, and the connecting rod H21 and the fixed plate 7 are all hinged; the two connecting rods E18 are fixedly connected to a synchronization rod, the two connecting rods G20 are fixedly connected to a synchronization rod, and both ends pass through the two reference chucks 1, and the ends of the two synchronization rods located on the same side of the reference chuck 1 are fixedly installed with spur gears A16 and spur gears B17, and the spur gears A16 and B17 are meshed, and the rotating nut 22 is fixedly installed on the spur gear A16, and the rotating nut 22 is rotated to drive the synchronization rod to rotate, thereby driving the connecting rod in the telescopic bracket to extend and retract, so that the fixed plate 7 moves, and at the same time, the fixed shaft 8 connected to the fixed plate 7 moves up and down in the guidance of the guide groove;

[0012] Two fixed rotating shafts 8 are penetrated and connected to the two ends of the connecting rod B13, and a rotating rod 9 is also penetrated in the middle of the connecting rod B13, and a rotating boss 10 is also connected to the rotating rod 9, and a connecting rod D15 is respectively hinged at both ends of the rotating boss 10, and the two connecting rods D15 are respectively hinged to a connecting rod C14, and the two connecting rods C14 are respectively hinged to an alignment block 11, and a connecting rod A12 is also respectively hinged on both sides of the rotating rod 9 on the connecting rod B13, and the two connecting rods A12 are respectively hinged to an alignment block 11; the two alignment blocks 11 are located above the connecting rod B13; the two connecting rods C14 are respectively penetrated on the two fixed rotating shafts 8 and rotate around the fixed rotating shafts 8; by rotating the rotating rod 9 in different directions, the rotating boss 10, the connecting rod D15, the connecting rod C14, and the connecting rod A12 are driven to move, so that the two alignment blocks 11 are separated or closed;

[0013] The straight profile is passed through the middle notch and clamped between the two alignment blocks 11 .

[0014] Optionally, the maximum distance between the two alignment blocks 11 is greater than 1.1 times the diameter D of the circumscribed circle of the cross section of the straight profile, and is used for lateral positioning of the straight profile whose cross section circumscribed circle diameter is less than or equal to D.

[0015] Optionally, the adjusting bolt 4 is passed upward from the lower surface of the leveling block 3 and connected to the upper positioning reference block 2, and the height position of the leveling blocks 3 on both sides is adjusted by rotating the adjusting nut at the end of the adjusting bolt 4;

[0016] The tightening bolt 5 is connected to the reference block 3 from the upper end of the upper positioning reference block 2. After the adjusting bolt 4 adjusts the position of the reference block 3, the tightening bolt 5 is tightened to fix the upper positioning reference block 2 and the reference block 3.

[0017] Use the laser head of the laser cutting machine to take points on the extended plane on both sides of the leveling block 3, rotate the adjustment bolt 4 according to the z coordinates of the two points to adjust the height of the two ends of the leveling block 3 to be consistent, and use the tightening bolt 5 to fix the position of the leveling block 3, so that the xy plane of the laser cutting positioning device is parallel to the xy plane of the laser cutting machine.

[0018] Optionally, the slide block 23 is connected to the top of the fixed plate 7 by bolts.

[0019] Optionally, the maximum telescopic height of the spring 24 is greater than 1.1 times the diameter D of the circumscribed circle of the straight profile cross section.

[0020] Optionally, the groove spacing is equal to the thickness of the jaws of the three-jaw chuck 200, so as to be closely matched with the three jaws of the three-jaw chuck 200;

[0021] The thickness of the reference chuck 1 is equal to the groove width of the jaws of the three-jaw chuck 200, and can be directly aligned and clamped in the three-jaw chuck 200;

[0022] The distance between the two reference chucks 1 is symmetrically distributed according to the length of the jaws of the three-jaw chuck 200.

[0023] Optionally, it also includes: a cushion block 6;

[0024] A cushion block 6 is provided on the end surface of the upper positioning reference block 2;

[0025] The top notch of the reference chuck 1 has a lug with an opening, and the pad 6, the upper positioning reference block 2 and the reference chuck 1 are connected in sequence by bolts and nuts, and the upper positioning reference block 2 is fixed to the notch at the top of the reference chuck 1.

[0026] Optionally, a through hole is provided on the fixed plate 7, and a positioning protrusion is provided inside the through hole;

[0027] The fixed rotating shaft 8 is provided with a positioning groove corresponding to the positioning protrusion.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The invention provides a straight profile laser cutting positioning device based on a three-jaw chuck, which can be applied to the precise positioning of straight profiles with various cross sections.

[0030] The present invention fine-tunes the height difference between the two ends of the leveling block by adjusting the adjusting bolts in the leveling mechanism, thereby adjusting the xy plane of the laser cutting positioning device of the present invention to be parallel to the xy plane of the laser cutting machine, thereby facilitating the leveling of the processing reference surface of straight profiles with a large linear span.

[0031] The present invention changes the distance between two alignment blocks by a rotating rod in an alignment mechanism, thereby adjusting the center position of a straight profile placed on a laser cutting machine, making the axis of the straight profile along its length direction parallel to the x-axis of the laser cutting machine, and aligning the straight profile clamped at both ends of the laser cutting machine.

[0032] The present invention adjusts the position of the fixed plate by rotating the nut in the telescopic bracket, so that two alignment blocks in the alignment mechanism are clamped at appropriate positions of the non-processed surfaces of straight profiles with different cross-sectional shapes.

[0033] The present invention provides additional clamping force for the straight profile through the spring in the tightening mechanism, so that the straight profile is precisely fitted with the lower surface of the leveling block; at the same time, the clamping force applied by the spring acts on the appropriate action point of the straight profile through the slider. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is an overall schematic diagram of the installation position of the laser cutting positioning device of the present invention on the laser cutting machine;

[0035] Figure 2 This is a partial enlarged view of the installation position of the laser cutting positioning device of the present invention on the laser cutting machine.

[0036] Figure 3 It is a schematic diagram of the overall structure of the laser cutting positioning device of the present invention;

[0037] Figure 4 It is a front isometric view of the alignment mechanism of the present invention;

[0038] Figure 5 It is a rear isometric view of the alignment mechanism of the present invention;

[0039] Figure 6 It is a structural schematic diagram of the telescopic bracket and the tightening mechanism of the present invention;

[0040] Among them, 1-reference chuck, 2-upper positioning reference block, 3-leveling block, 4-adjusting bolt, 5-tightening bolt, 6-pad, 7-fixed plate, 8-fixed shaft, 9-rotating rod, 10-rotating boss, 11-alignment block, 12-connecting rod A, 13-connecting rod B, 14-connecting rod C, 15-connecting rod D, 16-spur gear A, 17-spur gear B, 18-connecting rod E, 19-connecting rod F, 20-connecting rod G, 21-connecting rod H, 22-rotating nut, 23-slider, 24-spring, 25-top cap, 100-laser cutting machine base, 200-three-jaw chuck. DETAILED DESCRIPTION

[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0042] The present invention provides the following technical solutions:

[0043] The present invention provides a straight profile laser cutting positioning device based on a three-jaw chuck, comprising: two reference chucks 1, two upper positioning reference blocks 2, two leveling blocks 3, adjusting bolts 4, tightening bolts 5, two fixed plates 7, two fixed rotating shafts 8, a rotating rod 9, a rotating boss 10, an alignment block 11, a connecting rod A12, a connecting rod B13, a connecting rod C14, a connecting rod D15, a telescopic bracket, a slider 23, a spring 24, and a top cap 25;

[0044] The cross-sectional shape of each reference chuck 1 is a regular hexagon, with protrusions provided on three non-adjacent sides, and a groove provided in the middle of the protrusion, the groove being used to clamp the claws of the three-claw chuck 200;

[0045] Two reference chucks 1 are arranged in parallel, two top notches are provided on the top of the reference chuck 1, a middle notch is provided in the middle, two long strip guide grooves are provided on both sides of the middle notch, and upper positioning reference blocks 2 are inserted into the top notches of the two reference chucks 1 that are located opposite to each other;

[0046] Two leveling blocks 3 are respectively arranged outside the two reference chucks 1 and below the upper positioning reference block 2; the upper parts of both ends of the upper positioning reference block 2 are respectively provided with adjusting bolts 4 and tightening bolts 5, the adjusting bolts 4 are used to adjust the height of both ends of the leveling block 3, and the tightening bolts 5 are used to fix the height of the leveling block 3; both ends of the leveling block 3 are provided with extension planes for the laser head of the laser cutting machine to perform height sampling;

[0047] The two fixed plates 7 are fixedly connected by two fixed shafts 8, and each fixed shaft 8 moves up and down in two guide grooves at opposite positions; one end of the spring 24 is connected to the top cap 25, and the other end is connected to the slider 23, the slider 23 is connected to the upper end of the fixed plate 7, and the straight profile is clamped between the top cap 25 and the leveling block 3;

[0048] A telescopic bracket is installed under each fixed plate 7, and the telescopic bracket includes: a spur gear A16, a spur gear B17, a connecting rod E18, a connecting rod F19, a connecting rod G20, a connecting rod H21, and a rotating nut 22;

[0049] The connecting rod E18 and the connecting rod F19, the connecting rod G20 and the connecting rod H21, the connecting rod F19 and the fixed plate 7, and the connecting rod H21 and the fixed plate 7 are all hinged; the two connecting rods E18 are fixedly connected to a synchronization rod, the two connecting rods G20 are fixedly connected to a synchronization rod, and both ends pass through the two reference chucks 1, and the ends of the two synchronization rods located on the same side of the reference chuck 1 are fixedly installed with spur gears A16 and spur gears B17, and the spur gears A16 and B17 are meshed, and the rotating nut 22 is fixedly installed on the spur gear A16, and the rotating nut 22 is rotated to drive the synchronization rod to rotate, thereby driving the connecting rod in the telescopic bracket to extend and retract, so that the fixed plate 7 moves, and at the same time, the fixed shaft 8 connected to the fixed plate 7 moves up and down in the guidance of the guide groove;

[0050] Two fixed rotating shafts 8 are penetrated and connected to the two ends of the connecting rod B13, and a rotating rod 9 is also penetrated in the middle of the connecting rod B13, and a rotating boss 10 is also connected to the rotating rod 9, and a connecting rod D15 is respectively hinged at both ends of the rotating boss 10, and the two connecting rods D15 are respectively hinged to a connecting rod C14, and the two connecting rods C14 are respectively hinged to an alignment block 11, and a connecting rod A12 is also respectively hinged on both sides of the rotating rod 9 on the connecting rod B13, and the two connecting rods A12 are respectively hinged to an alignment block 11; the two alignment blocks 11 are located above the connecting rod B13; the two connecting rods C14 are respectively penetrated on the two fixed rotating shafts 8 and rotate around the fixed rotating shafts 8; by rotating the rotating rod 9 in different directions, the rotating boss 10, the connecting rod D15, the connecting rod C14, and the connecting rod A12 are driven to move, so that the two alignment blocks 11 are separated or closed;

[0051] The straight profile is passed through the middle notch and clamped between the two alignment blocks 11 .

[0052] Optionally, the maximum distance between the two alignment blocks 11 is greater than 1.1 times the diameter D of the circumscribed circle of the cross section of the straight profile, and is used for lateral positioning of the straight profile whose cross section circumscribed circle diameter is less than or equal to D.

[0053] Optionally, the adjusting bolt 4 is passed upward from the lower surface of the leveling block 3 and connected to the upper positioning reference block 2, and the height position of the leveling blocks 3 on both sides is adjusted by rotating the adjusting nut at the end of the adjusting bolt 4;

[0054] The tightening bolt 5 is connected to the reference block 3 from the upper end of the upper positioning reference block 2. After the adjusting bolt 4 adjusts the position of the reference block 3, the tightening bolt 5 is tightened to fix the upper positioning reference block 2 and the reference block 3.

[0055] Use the laser head of the laser cutting machine to take points on the extended plane on both sides of the leveling block 3, rotate the adjustment bolt 4 according to the z coordinates of the two points to adjust the height of the two ends of the leveling block 3 to be consistent, and use the tightening bolt 5 to fix the position of the leveling block 3, so that the xy plane of the laser cutting positioning device is parallel to the xy plane of the laser cutting machine.

[0056] Optionally, the slide block 23 is connected to the top of the fixed plate 7 by bolts.

[0057] Optionally, the maximum telescopic height of the spring 24 is greater than 1.1 times the diameter D of the circumscribed circle of the straight profile cross section.

[0058] Optionally, the groove spacing is equal to the thickness of the jaws of the three-jaw chuck 200, so as to be closely matched with the three jaws of the three-jaw chuck 200;

[0059] The thickness of the reference chuck 1 is equal to the groove width of the jaws of the three-jaw chuck 200, and can be directly aligned and clamped in the three-jaw chuck 200;

[0060] The distance between the two reference chucks 1 is symmetrically distributed according to the length of the jaws of the three-jaw chuck 200.

[0061] Optionally, it also includes: a cushion block 6;

[0062] A cushion block 6 is provided on the end surface of the upper positioning reference block 2;

[0063] The top notch of the reference chuck 1 has a lug with an opening, and the pad 6, the upper positioning reference block 2 and the reference chuck 1 are connected in sequence by bolts and nuts, and the upper positioning reference block 2 is fixed to the notch at the top of the reference chuck 1.

[0064] Optionally, a through hole is provided on the fixed plate 7, and a positioning protrusion is provided inside the through hole;

[0065] The fixed rotating shaft 8 is provided with a positioning groove corresponding to the positioning protrusion.

[0066] Exemplarily, the present invention provides a straight profile laser cutting positioning device based on a three-jaw chuck, comprising a reference chuck, wherein the reference chuck is symmetrically grooved at the top and the middle, and a leveling mechanism is installed on the top groove of the reference chuck, and the leveling mechanism is composed of an upper positioning reference block, a leveling block, an adjusting bolt and a tightening bolt; an alignment mechanism is installed on the middle groove of the reference chuck, and the alignment mechanism is composed of a rotating rod, a rotating boss, an alignment block, a connecting rod A, a connecting rod B, a connecting rod C, and a connecting rod D; a telescopic bracket is installed under the fixed plate of the alignment mechanism, and the telescopic bracket is composed of a spur gear A, a spur gear B, a connecting rod E, a connecting rod F, a connecting rod G, a connecting rod H, and a rotating nut; a tightening mechanism is installed on the top of the fixed plate of the alignment mechanism, and the tightening mechanism is composed of a slider, a spring, and a top cap.

[0067] Preferably, the cross-sectional shape of the reference chuck is approximately a regular hexagon, and the spacing between the grooves of the protruding parts on the three sides is equal to the thickness of the jaws of the three-jaw chuck, so that it can fit tightly with the three jaws of the three-jaw chuck; the thickness of the reference chuck is equal to the groove width of the jaws of the three-jaw chuck, so it can be directly aligned and clamped in the three-jaw chuck; to facilitate uniform load bearing, the spacing between the two reference chucks is symmetrically distributed according to the length of the jaws of the three-jaw chuck.

[0068] Preferably, the positioning method of the leveling mechanism is to use the laser head of the laser cutting machine to sample points on the extended planes on both sides of the leveling block, adjust the height of the two ends of the leveling block by rotating the adjusting bolts according to the z-coordinate of each point, and use the tightening bolts to fix the position of the leveling block, so that the xy plane of the laser cutting positioning device of the present invention is parallel to the xy plane of the laser cutting machine.

[0069] Preferably, the connecting rod A and connecting rod B, connecting rod C and connecting rod D, connecting rod D and rotating boss, connecting rod A and connecting rod C and alignment block, rotating rod and rotating boss in the alignment mechanism are all connected by bolts, and connecting rod B and connecting rod C are connected by a fixed rotating shaft; the alignment mechanism is installed at the middle notch of the reference chuck using nuts through the fixed plate and the fixed rotating shaft.

[0070] Preferably, the positioning method of the alignment mechanism is to adjust the distance between the two alignment blocks by rotating the rotating rod so that the axis of the straight profile along its length direction is parallel to the x-axis of the laser cutting machine. The maximum distance between the two alignment blocks is greater than 1.1 times the diameter D of the circumscribed circle of the cross section of the straight profile, which can be used for precise lateral positioning of straight profiles with a diameter of the circumscribed circle of the cross section less than or equal to D.

[0071] Preferably, the connecting rods E and F, the connecting rods G and H, and the connecting rods F and H and the fixed plate in the telescopic bracket are all connected by bolts; the telescopic bracket is installed at the bottom of the reference chuck by a rotating shaft, bolts and rotating nuts.

[0072] Preferably, the telescopic bracket adjusts the height position of the fixed plate in the middle notch of the reference chuck by rotating the rotating nut.

[0073] Preferably, the sliding block of the tightening mechanism is connected to the top of the fixed plate by bolts.

[0074] Preferably, the positioning method of the clamping mechanism can be achieved by moving the slider 23 on the fixed plate 7 and adjusting the height of the spring 24 so that the straight profile is clamped against the lower surface of the leveling block 3; the maximum telescopic height of the spring 24 is greater than 1.1 times the diameter D of the circumscribed circle of the straight profile cross section.

[0075] See also Figure 1-2The laser cutting positioning device of the present invention is respectively installed and fixed on the three-jaw chuck 200 at both ends of the laser cutting machine base 100.

[0076] See also Figure 3 The laser cutting positioning device of the present invention comprises two reference chucks 1, the reference chucks 1 are symmetrically grooved at the top and the middle, a leveling mechanism is installed at the top groove of the reference chuck 1, the leveling mechanism is composed of two upper positioning reference blocks 2, two leveling blocks 3, four adjusting bolts and four tightening bolts 5, and is fixed in the groove at the top of the reference chuck by a gasket 6 and bolts and nuts; an alignment mechanism is installed at the middle groove of the reference chuck 1.

[0077] See also Figure 4-5 The alignment mechanism of the present invention is composed of two fixed rotating shafts 8, a rotating rod 9, a rotating boss 10, two alignment blocks 11, two connecting rods A12, a connecting rod B13, two connecting rods C14, and two connecting rods D15; wherein, the connecting rod A12 and the connecting rod B13, the connecting rod C14 and the connecting rod D15, the connecting rod D15 and the rotating boss 10, the connecting rod A12 and the connecting rod C14 and the alignment block 11, the rotating rod 9 and the rotating boss 10 are all connected by bolts, and the connecting rod B13 and the connecting rod C14 are connected by the fixed rotating shaft 8; the alignment mechanism is installed at the middle notch of the reference chuck 1 through the fixed plate 7 and the fixed rotating shaft 8 using nuts.

[0078] See also Figure 6 The telescopic bracket of the present invention is composed of two spur gears A16, two spur gears B17, two connecting rods E18, two connecting rods F19, two connecting rods G20, two connecting rods H21 and two rotating nuts 22; wherein, the two spur gears A16 and the two spur gears B17 are fixed to the bottom of the reference chuck 1 through the rotating shaft and the rotating nut 22 respectively; wherein, the connecting rod E18 and the connecting rod F19, the connecting rod G20 and the connecting rod H21, the connecting rod F19 and the connecting rod H21 and the fixing plate 7 are all connected by bolts.

[0079] See also Figure 6 The clamping mechanism of the present invention is composed of two sliders 23, two springs 24, and two top caps; wherein the slider 23 is fixed to the top of the fixed plate 7 by bolts.

[0080] The working principle of the present invention is as follows: the laser cutting positioning device of the present invention is fixed in the three-jaw chuck 200 at both ends of the laser cutting machine base 100 through the reference chuck 1; first, the laser head of the laser cutting machine is used to collect points at the extension planes on both sides of the leveling block 3 in the leveling mechanism, and the heights of the two ends of the leveling block 3 are adjusted by rotating the adjusting bolts 4 according to the z coordinates of each point, and the position of the leveling block 3 is fixed by the tightening bolts 5, so that the xy plane of the laser cutting positioning device of the present invention is parallel to the xy plane of the laser cutting machine; secondly, the straight profile to be cut is fed from one side of the three-jaw chuck 200, and the spacing between the two alignment blocks 11 is adjusted by rotating the rotating rod 9 in the alignment mechanism, so that the axis of the straight profile along its length direction is parallel to the x-axis of the laser cutting machine; the height position of the fixed plate 7 in the middle notch of the reference chuck 1 is adjusted by screwing the rotating nut 22 in the telescopic bracket; the straight profile is tightened against the lower surface of the leveling block 3 by moving the position of the slider 23 in the tightening mechanism on the fixed plate 7 and adjusting the height of the spring 24.

[0081] Those skilled in the art should understand that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A straight profile laser cutting positioning device based on a three-jaw chuck, characterized in that: include: Two reference chucks (1), two upper positioning reference blocks (2), two leveling blocks (3), adjusting bolts (4), tightening bolts (5), two fixed plates (7), two fixed rotating shafts (8), a rotating rod (9), a rotating boss (10), an alignment block (11), a connecting rod A (12), a connecting rod B (13), a connecting rod C (14), a connecting rod D (15), a telescopic bracket, a slider (23), a spring (24), and a top cap (25); The cross-sectional shape of each reference chuck (1) is a regular hexagon, with protrusions provided on three non-adjacent sides and a groove provided in the middle of the protrusion, the groove being used to clamp the jaws of the three-jaw chuck (200); The two reference chucks (1) are arranged in parallel, the reference chucks (1) are provided with two top notches at the top, a middle notch at the middle, two long strip guide grooves are arranged on both sides of the middle notch, and upper positioning reference blocks (2) are inserted into the top notches of the two reference chucks (1) that are located opposite to each other; Two leveling blocks (3) are respectively arranged outside the two reference chucks (1) and are located below the upper positioning reference block (2); the upper parts of the two ends of the upper positioning reference block (2) are respectively provided with adjusting bolts (4) and tightening bolts (5); the adjusting bolts (4) are used to adjust the height of the two ends of the leveling block (3), and the tightening bolts (5) are used to fix the height of the leveling block (3); the two ends of the leveling block (3) are provided with extension planes for the laser head of the laser cutting machine to perform height sampling; The two fixed plates (7) are fixedly connected via two fixed rotating shafts (8), and each fixed rotating shaft (8) moves up and down in two guide grooves located opposite to each other; one end of the spring (24) is connected to the top cap (25), and the other end is connected to the slide block (23), the slide block (23) is connected to the upper end of the fixed plate (7), and the straight profile is clamped between the top cap (25) and the leveling block (3); A telescopic bracket is installed under each fixed plate (7), and the telescopic bracket includes: a spur gear A (16), a spur gear B (17), a connecting rod E (18), a connecting rod F (19), a connecting rod G (20), a connecting rod H (21), and a rotating nut (22); The connecting rod E (18) and the connecting rod F (19), the connecting rod G (20) and the connecting rod H (21), the connecting rod F (19) and the fixed plate (7), and the connecting rod H (21) and the fixed plate (7) are all hinged; the two connecting rods E (18) are fixedly connected to a synchronization rod, the two connecting rods G (20) are fixedly connected to a synchronization rod, and both ends pass through two reference chucks (1); the ends of the two synchronization rods located on the same side of the reference chucks (1) are fixedly installed with a spur gear A (16) and a spur gear B (17); the spur gear A (16) and the spur gear B (17) are meshed; the rotating nut (22) is fixedly installed on the spur gear A (16); the rotating nut (22) is rotated to drive the synchronization rod to rotate, thereby driving the connecting rod in the telescopic bracket to telescope, so that the fixed plate (7) moves, and at the same time, the fixed rotating shaft (8) connected to the fixed plate (7) moves up and down under the guidance of the guide groove; Two fixed rotating shafts (8) are connected to the two ends of the connecting rod B (13). A rotating rod (9) is also connected to the middle of the connecting rod B (13). A rotating boss (10) is also connected to the rotating rod (9). A connecting rod D (15) is hinged to each end of the rotating boss (10). The two connecting rods D (15) are respectively hinged to a connecting rod C (14). The two connecting rods C (14) are respectively hinged to an alignment block (11). The two sides of the rotating rod (9) on the connecting rod B (13) are also respectively hinged to a connecting rod D (15). Rod A (12), two connecting rods A (12) are respectively hinged to an alignment block (11); the two alignment blocks (11) are located above the connecting rod B (13); the two connecting rods C (14) are respectively passed through two fixed rotating shafts (8) and rotate around the fixed rotating shafts (8); by rotating the rotating rod (9) in different directions, the rotating boss (10), the connecting rod D (15), the connecting rod C (14), and the connecting rod A (12) are driven to move, so that the two alignment blocks (11) are separated or closed; The straight profile is passed through the middle notch and clamped between two alignment blocks (11).

2. The straight profile laser cutting positioning device based on a three-jaw chuck according to claim 1 is characterized in that: The maximum distance between the two alignment blocks (11) is greater than 1.1 times the diameter D of the circumscribed circle of the cross section of the straight profile, and is used for the lateral positioning of the straight profile whose cross section circumscribed circle diameter is less than or equal to D.

3. The straight profile laser cutting positioning device based on a three-jaw chuck according to claim 1 is characterized in that: The adjusting bolt (4) penetrates upward from the lower surface of the leveling block (3) and is connected to the upper positioning reference block (2). The height position of the leveling blocks (3) on both sides is adjusted by rotating the adjusting nut at the end of the adjusting bolt (4); The tightening bolt (5) is connected to the reference clamp (3) from the upper end of the upper positioning reference clamp (2). After the adjusting bolt (4) adjusts the position of the reference clamp (3), the tightening bolt (5) is tightened to fix the upper positioning reference clamp (2) and the reference clamp (3). The laser head of the laser cutting machine is used to take points at the extension planes on both sides of the leveling block (3), and the adjusting bolts (4) are rotated according to the z coordinates of the two taken points to adjust the heights of the two ends of the leveling block (3) to be consistent, and the position of the leveling block (3) is fixed by using the tightening bolts (5) so that the xy plane of the laser cutting positioning device is parallel to the xy plane of the laser cutting machine.

4. The straight profile laser cutting positioning device based on a three-jaw chuck according to claim 1 is characterized in that: The slide block (23) is connected to the top of the fixed plate (7) by bolts.

5. The straight profile laser cutting positioning device based on a three-jaw chuck according to claim 1 is characterized in that: The maximum telescopic height of the spring (24) is greater than 1.1 times the diameter D of the circumscribed circle of the straight profile cross section.

6. The straight profile laser cutting positioning device based on a three-jaw chuck according to claim 1 is characterized in that: The groove spacing is equal to the thickness of the jaws of the three-jaw chuck (200), and is used to closely match the three jaws of the three-jaw chuck (200); The thickness of the reference chuck (1) is equal to the groove width of the jaws of the three-jaw chuck (200), and can be directly aligned and clamped in the three-jaw chuck (200); The distance between the two reference chucks (1) is symmetrically distributed according to the length of the jaws of the three-jaw chuck (200).

7. The straight profile laser cutting positioning device based on a three-jaw chuck according to claim 1 is characterized in that: Also includes: Spacer (6); A cushion block (6) is arranged on the end surface of the upper positioning reference clamp block (2); The top notch of the reference chuck (1) is provided with a lug with an opening, and the cushion block (6), the upper positioning reference block (2) and the reference chuck (1) are sequentially connected by means of bolts and nuts, and the upper positioning reference block (2) is fixed to the notch at the top of the reference chuck (1).

8. The straight profile laser cutting positioning device based on a three-jaw chuck according to claim 1 is characterized in that: A through hole is provided on the fixed plate (7), and a positioning protrusion is provided inside the through hole; A positioning groove corresponding to the positioning protrusion is arranged on the fixed rotating shaft (8).

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