An automatic positioning device for the cylinder body of a 3D printing device

Abstract

The present invention relates to the technical field of metal 3D printing, and specifically relates to an automatic positioning device for a cylinder block of a 3D printing device, including a frame, a moving carrier plate, a positioning mechanism, and a locking unit. In the present invention, preliminary front-back positioning in the front-back direction is performed by front and rear limit plates, and then preliminary left-right positioning is performed by pressing strips to provide a positioning reference for the subsequent positioning process. After that, the limit rod gradually abuts against the inner wall of the through hole, the pressing rod located in the waist-shaped groove captures and limits the cylinder block, and the pressing rod located outside the waist-shaped groove presses the cylinder block. In summary, precise positioning of the cylinder block is performed to make it directly above the lifting seat. Finally, a plurality of stable triangular frames are formed by the locking unit to ensure the stability of the rod body during the subsequent movement to the upper line, avoiding the problem of poor accuracy of the cylinder block position caused by movement. Secondly, automatic positioning and feeding of the cylinder block are realized, improving the efficiency of cylinder block positioning and feeding.

Description

Technical Field

[0001] The present invention relates to the technical field of metal 3D printing, and specifically to an automatic positioning device for the cylinder block of a 3D printing device. Background Technique

[0002] Powder melting metal additive manufacturing is an advanced 3D printing technology, commonly used in fields such as aerospace, automotive, medical, and mold manufacturing. Metal powder is laid layer by layer and selectively melted using a laser or electron beam as a heat source, causing the powder in the corresponding area to fuse and form the required solid part. Among them, the cylinder block used in the process of powder melting metal additive manufacturing is one of the core parts of the device, usually referred to as a build chamber or a forming chamber, and an empty cylinder block needs to be moved into the corresponding printing position before operation.

[0003] Currently, the empty cylinder block in a 3D printing device is first transported by an external existing logistics AGV cart, and manual labor is used to cooperate to load the empty cylinder block onto the printing area. This requires multiple manual operations with auxiliary tools and belongs to a semi-automatic operation process. Secondly, because of the high precision requirements of 3D printing devices, the transportation of the cylinder block by the logistics AGV cart cannot meet the precision requirements, affecting the efficiency during the overall printing process and the accuracy of loading the cylinder block, and easily causing problems that affect the subsequent printing effect. Summary of the Invention

[0004] Based on this, it is necessary to provide an automatic positioning device for the cylinder block of a 3D printing device, aiming to solve the problems of the above-mentioned existing technologies.

[0005] This application provides an automatic positioning device for the cylinder block of a 3D printing device, including: a frame, on the upper end surface of the frame, a U-shaped base plate is fixedly arranged. On the upper end surface of the base plate, a plurality of balls arranged circumferentially along its U-shaped area are rollably arranged. A moving carrier plate is placed on the upper end surface of the base plate. The moving carrier plate is driven by an external hydraulic cylinder 1 to move left and right and is used to carry and move the cylinder block.

[0006] A positioning mechanism for limiting the cylinder block is arranged on the frame. The positioning mechanism includes an L-shaped frame. The L-shaped frame is arranged on the moving carrier plate. On the upper end surface of the horizontal section of the L-shaped frame, a lifting seat is slidably arranged up and down through two connecting rods distributed left and right. On both the front and rear sides of the lifting seat, two limiting rods distributed left and right and with a vertical axis are arranged. On both the left and right sides of the lifting seat, two pressing strips distributed front and rear are arranged. A driving unit is arranged on the L-shaped frame. The driving unit includes an opposite moving group and a delay driving group. When the lifting seat rises, the limiting rods are driven to insert into the through holes at the corresponding positions at the bottom of the cylinder block, and two locking triangles are formed by the cooperation of the four limiting rods to center the cylinder block front and back, and the pressing strips on both sides press and center the cylinder block left and right.

[0007] The upper end surface of the base plate is provided with a preliminary limiting unit. The preliminary limiting unit includes a longitudinal cylinder and a limiting plate for preliminary limiting. Two rows of longitudinally arranged cylinders are fixedly arranged on the upper end surface of the base plate at equal intervals from left to right. The telescopic end of the longitudinal cylinder is fixedly provided with an L-shaped limiting plate, and the inner corner area of the limiting plate faces downward. The front and rear distributed limiting plates are symmetric about the front and back. A locking unit is arranged on the L-shaped frame. The locking unit includes a moving rod for locking the pressing strip and a pressing plate for locking the limiting rod. After the positioning and guiding of the cylinder body are completed, the state of the cylinder body is locked by the locking unit, and then the cylinder body is moved.

[0008] According to a preferred embodiment, the positioning mechanism includes sliding blocks. The front and rear end faces of the lifting seat are each provided with a sliding block that slides back and forth through a connecting shaft. Two symmetrically arranged hinge bars are hinged to the opposite faces of the two sliding blocks. All the limiting rods are fixedly arranged on the upper end faces of the corresponding hinge bars. A first spring is fixedly arranged between two adjacent hinge bars to maintain the included angle between the two adjacent hinge bars in the initial state.

[0009] According to a preferred embodiment, the diameter of the limiting rod is smaller than the diameter of the through hole at the bottom of the cylinder body.

[0010] According to a preferred embodiment, a placement groove is formed through the front and rear of the lifting seat. The approaching movement group includes a rotating shaft. The lower end face of the lifting seat is rotatably provided with a rotating shaft that penetrates into the placement groove, and the rotating shaft is located at the center of the lifting seat. A gear is fixedly sleeved on the rotating shaft. Two laterally distributed racks are slidably arranged on the front and rear inner walls of the placement groove, and the two racks are symmetric about the left and right center of the axis of the rotating shaft. The sliding blocks correspond to the racks one by one. A horizontally extending rod with an axis extending from front to back is fixedly arranged on the end face of the sliding block facing the corresponding rack. The horizontally extending rod slidably penetrates through the corresponding rack back and forth. A second spring is fixedly sleeved on the horizontally extending rod between the rack and the sliding block.

[0011] According to a preferred embodiment, the time-delay driving group includes a mating cylinder. The upper end face of the L-shaped frame is fixedly provided with a mating cylinder. A spiral groove is formed in the inner wall of the mating cylinder. A mating rod that cooperates with the spiral groove is fixedly arranged on the rotating shaft.

[0012] According to a preferred embodiment, a vertically oriented lag groove is formed inside the mating cylinder. The lag groove is located below the spiral groove and communicates with the spiral groove. The mating rod is located in the lag groove before cooperating with the spiral groove.

[0013] According to an advantageous embodiment, the positioning mechanism further includes a mounting frame. L-shaped mounting frames are fixedly arranged on the left and right end faces of the lifting seat. On the upper end face of the vertical section of the mounting frame, a mounting plate is fixedly arranged. The lower end face of the pressing strip is hinged to the corresponding mounting plate. A plurality of pressing rods for positioning the waist-shaped grooves on the left and right end faces of the cylinder body shell are arranged on the pressing strip. Limiting strips are fixedly arranged on the left and right end faces of the mounting plate, and the two corresponding limiting strips cooperate with each other to limit the rotation angle of the two corresponding pressing strips within a set range.

[0014] According to an advantageous embodiment, the plurality of pressing rods on the same pressing strip are arranged at equal intervals along the length direction of the pressing strip, and the axial direction of the pressing rod is the same as the thickness direction of the pressing strip. A fixed circular plate is fixedly arranged on the end face of the pressing rod away from the pressing strip, and a third spring is fixedly arranged between the fixed circular plate and the pressing strip.

[0015] According to an advantageous embodiment, the locking unit includes a moving rod. Two axially vertical and left-right symmetric moving rods are slidably arranged up and down on the horizontal section of the L-shaped frame. The two moving rods are driven by an external hydraulic cylinder three to move up and down. A locking plate is fixedly arranged between two adjacent pressing strips. A locking groove is formed on the locking plate. The lower end of the inner wall of the locking groove and the upper end of the moving rod are both chamfered. A mounting circular plate is fixedly sleeved on the moving rod. A pushing plate is arranged above the moving rod, and a fourth spring is fixedly arranged between the pushing plate and the mounting circular plate.

[0016] According to an advantageous embodiment, the locking unit further includes a loop-shaped strip. A loop-shaped strip is fixedly arranged on the two moving rods. Two front-back distributed pressing plates are fixedly arranged on the loop-shaped strip. The upper end of the pressing plate is an isosceles trapezoid with a larger upper part and a smaller lower part. The pressing plate presses the corresponding two hinge strips to lock the corresponding two limiting rods.

[0017] In summary, the present invention has at least the following beneficial effects: First, in the present invention, preliminary positioning in the front-back direction is carried out through the limiting plate, and then preliminary positioning in the left-right direction is carried out through the pressing strip, providing a positioning reference for the subsequent positioning process. The limiting rod gradually abuts against the inner wall of the through hole, the pressing rod located in the waist-shaped groove captures and limits the cylinder body, and the pressing rod located outside the waist-shaped groove presses the cylinder body. In summary, precise positioning of the cylinder body is carried out so that it is directly above the lifting seat. Finally, a plurality of stable triangular frames are formed through the locking unit to ensure the stability of the cylinder body during the subsequent movement to the upper line process, avoiding the problem that the position accuracy of the cylinder body becomes poor due to movement. Secondly, automatic positioning and feeding of the cylinder body are realized, improving the efficiency of cylinder body positioning and feeding.

[0018] Second, the extrusion plate moves upward to between the corresponding two hinge bars, so that a fixed triangular frame is jointly formed between the extrusion plate and the corresponding two hinge bars, improving the positioning stability while locking the position of the limiting rod. Through the locking process, it is ensured that the cylinder block is in the specified position before moving onto the production line, guaranteeing the accuracy of the subsequent cylinder block moving onto the production line.

[0019] Third, a limiting rod with a smaller diameter is first inserted into the through hole and then moved to abut against the hole wall. The four abutting forces cooperate in pairs to position the cylinder block in the front-back, left-right directions, reducing the requirement for the position accuracy after the initial positioning of the cylinder block. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0021] Figure 1 Shows a schematic three-dimensional structure diagram of a cylinder block automatic positioning device for a 3D printing device according to an embodiment of the present invention.

[0022] Figure 2 Shows an exploded structure diagram among the cylinder block, the moving carrier plate, and the frame according to an embodiment of the present invention.

[0023] Figure 3 Shows a partially sectional three-dimensional structure diagram among the cylinder block, the moving carrier plate, and the limiting rod according to an embodiment of the present invention.

[0024] Figure 4 Shows a partially sectional three-dimensional structure diagram among the moving carrier plate, the lifting seat, and the extrusion plate according to an embodiment of the present invention.

[0025] Figure 5 Shows according to an embodiment of the present invention Figure 4 An enlarged view of part A.

[0026] Figure 6 Shows a partially sectional three-dimensional structure diagram among the lifting seat, the limiting rod, and the mating cylinder according to an embodiment of the present invention.

[0027] Figure 7 Shows according to an embodiment of the present invention Figure 6 An enlarged view of part B.

[0028] Figure 8 Shows a schematic diagram of the state change of the four limiting rods limiting and tightly abutting the bottom through holes of the cylinder block according to an embodiment of the present invention.

[0029] Among them, the above-mentioned attached drawings include the following reference numerals: 1, frame; 2, base plate; 3, ball; 4, movable carrier plate; 5, positioning mechanism; 50, L-shaped frame; 500, lifting seat; 501, limiting rod; 502, pressing strip; 51, longitudinal cylinder; 510, limiting plate; 52, sliding block; 520, hinge strip; 521, first spring; 53, placement groove; 54, driving unit; 540, rotating shaft; 541, gear; 542, rack; 543, horizontal rod; 544, second spring; 545, mating cylinder; 546, spiral groove; 547, mating rod; 548, lag groove; 55, mounting frame; 550, mounting plate; 551, pressing rod; 552, limiting strip; 56, fixed circular plate; 560, third spring; 6, locking unit; 60, moving rod; 600, locking plate; 601, pushing plate; 602, fourth spring; 61, loop strip; 610, pressing plate; 7, cylinder block. Detailed implementation manners

[0030] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention with reference to the attached drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0031] As Figure 1 and Figure 2 shown, an automatic positioning device for the cylinder block of a 3D printing device includes a frame 1. A U-shaped base plate 2 is fixedly arranged on the upper end surface of the frame 1. A plurality of balls 3 arranged circumferentially along the U-shaped area are rollingly arranged on the upper end surface of the base plate 2. A movable carrier plate 4 is placed on the upper end surface of the base plate 2. The movable carrier plate 4 is driven by an external hydraulic cylinder I (not shown in the figure) to move left and right and is used to carry and move the cylinder block 7.

[0032] As Figure 1 , Figure 3 , Figure 4 and Figure 6As shown, a positioning mechanism 5 for limiting the cylinder body 7 is provided on the frame 1. The positioning mechanism 5 includes an L-shaped frame 50. The L-shaped frame 50 is provided on the moving carrier plate 4. The upper end surface of the horizontal section of the L-shaped frame 50 is slidably provided with a lifting seat 500 up and down through two connecting rods distributed left and right. The lifting seat 500 is driven by an external hydraulic cylinder two (not shown in the figure) to move up and down. Two limiting rods 501 distributed left and right and with vertical axes are provided on both the front and rear sides of the lifting seat 500. Two pressing strips 502 distributed front and rear are provided on both the left and right sides of the lifting seat 500. A driving unit 54 is provided on the L-shaped frame 50. The driving unit 54 includes an opposite moving group and a delay driving group. When the lifting seat 500 rises, the limiting rods 501 are driven to insert into the through holes at the corresponding positions at the bottom of the cylinder body 7, and two locking triangles are formed by the cooperation of the four limiting rods 501. At the same time, the cylinder body 7 is centered front and rear, and the cylinder body 7 is pressed and centered left and right by the two pressing strips 502 on both sides.

[0033] As Figure 1 and Figure 2 shown, a preliminary limiting unit is provided on the upper end surface of the base plate 2. The preliminary limiting unit includes a longitudinal cylinder 51 and a limiting plate 510 for preliminary limiting. Two rows of longitudinal cylinders 51 arranged equidistantly from left to right are fixedly provided on the upper end surface of the base plate 2. The telescopic end of the longitudinal cylinder 51 is fixedly provided with an L-shaped limiting plate 510. The inner corner area of the limiting plate 510 faces downward. The limiting plates 510 distributed front and rear are symmetric front and rear. A locking unit 6 is provided on the L-shaped frame 50. The locking unit 6 includes a moving rod 60 for locking the pressing strip 502 and a pressing plate 610 for locking the limiting rod 501. After the positioning and guiding of the cylinder body 7 are completed, the state of the cylinder body is locked by the locking unit 6, and then the cylinder body 7 is moved.

[0034] During operation, the external hydraulic cylinder one works to move the moving carrier plate 4 to the right. Then, an existing external AGV places the cylinder body 7 on the moving carrier plate 4. The moving carrier plate 4 resets and drives the cylinder body 7 to move to the left above the frame 1. During this process, the friction between the moving carrier plate 4 and the base plate 2 is reduced by the multiple balls 3 provided, avoiding excessive wear of the moving carrier plate 4 during reciprocating movement left and right and affecting the subsequent positioning process.

[0035] Then the longitudinal cylinder 51 works, causing its telescopic end to drive the limiting plate 510 to extend out. The limiting plate 510 approaches the cylinder body 7 and the moving carrier plate 4. Finally, the vertical section of the limiting plate 510 contacts the moving carrier plate 4, and the horizontal section of the limiting plate 510 contacts the cylinder body 7. The cooperation between the limiting plates 510 distributed front and rear completes the limiting and pressing of the moving carrier plate 4 and the cylinder body 7 in the front-rear direction. Among them, limiting the moving carrier plate 4 ensures the stability of the moving carrier plate 4 during the subsequent adjustment and positioning of the cylinder body 7, and the limiting and pressing process of the cylinder body 7 in the front-rear direction facilitates the subsequent positioning operation.

[0036] Refer toFigure 8 After that, the external hydraulic cylinder II works to move the lifting seat 500 upward. The lifting seat 500 drives the pressing strip 502 to move upward to a specified position. Then, as the lifting seat 500 continues to move upward, the driving unit 54 operates, causing the pressing strip 502 to press against the left and right sides of the cylinder block 7, completing the limit in the left and right directions of the cylinder block 7. At this time, the limiting rod 501 is located directly below the corresponding through hole on the cylinder block 7. Then, as the lifting seat 500 continues to move upward, the limiting rod 501 passes through the through hole at the bottom of the cylinder block 7 and causes the two limiting rods 501 on the same side to gradually press against the inner wall of the through hole, that is, the positioning and guiding process of the cylinder block 7 is completed. The locking unit 6 works, causing the two corresponding limiting rods 501 on the same side to be locked and the pressing strip 502 to be locked, finally forming a stable positioning of the cylinder block 7. Then, the external hydraulic cylinder I works to drive the moving carrier plate 4 to move out the positioned cylinder block 7 and convey the cylinder block 7 to the 3D printing device.

[0037] As Figure 1 , Figure 4 and Figure 6 As shown in [figures], the positioning mechanism 5 includes sliding blocks 52. The front and rear end faces of the lifting seat 500 are each provided with a sliding block 52 that slides back and forth through a connecting shaft. The opposite sides of the two sliding blocks 52 are each hinged with two symmetrically arranged hinge bars 520 on the left and right. All the limiting rods 501 are fixedly arranged on the upper end faces of the corresponding hinge bars 520. A first spring 521 is fixedly arranged between adjacent two hinge bars 520 to maintain the included angle between adjacent two hinge bars 520 in the initial state through the first spring 521.

[0038] As Figure 3 As shown in [figures], the diameter of the limiting rod 501 is smaller than the diameter of the through hole at the bottom of the cylinder block 7, which facilitates the smooth passing of the limiting rod 501 through the corresponding through hole during the subsequent positioning process and also reduces the requirement for the accuracy of the initial placement position of the cylinder block 7.

[0039] As Figure 4 and Figure 6 As shown in [figures], a placement groove 53 is formed through the front and rear of the lifting seat 500. The opposite movement group includes a rotating shaft 540. The lower end face of the lifting seat 500 is rotatably provided with a rotating shaft 540 that penetrates into the placement groove 53, and the rotating shaft 540 is located at the central position of the lifting seat 500. A gear 541 is fixedly sleeved on the rotating shaft 540. Two racks 542 that are distributed left and right and mesh with the gear 541 are slidably arranged on the front and rear inner walls of the placement groove 53, and the two racks 542 are symmetric about the axis of the rotating shaft 540. The sliding blocks 52 correspond to the racks 542 one by one. A horizontal rod 543 with an axis extending from front to back is fixedly arranged on the end face of the sliding block 52 facing the corresponding rack 542. The horizontal rod 543 slides through the corresponding rack 542 back and forth. A second spring 544 is fixedly sleeved on the horizontal rod 543 between the rack 542 and the sliding block 52.

[0040] During operation, after the moving carrier plate 4 drives the cylinder block 7 to move above the frame 1, the external second hydraulic cylinder works to move the lifting seat 500 upward. The lifting seat 500 drives the hinge bars 520 and the limit rods 501 thereon to move upward synchronously. It should be noted that through the preliminary guiding of the front and rear limit plates 510, the cylinder block 7 is located at the middle position in the front - rear direction on the moving carrier plate 4. At the same time, the process of the pressing bar 502 pressing the cylinder block 7 makes the cylinder block 7 located at the middle position in the left - right direction of the frame 1, that is, the alignment process of the cylinder block 7 is completed.

[0041] After that, the lifting seat 500 continues to move upward, so that the limit rod 501 passes through the corresponding through - hole on the cylinder block 7. Through the operation of the driving unit 54, the rotating shaft 540 drives the gear 541 to rotate. Through the meshing between the gear 541 and the rack 542, the rack 542 moves away from the corresponding sliding block 52, so that the second spring 544 is stretched. Through the elastic force generated by the stretching of the second spring 544, the sliding block 52 pulls the two hinge bars 520 thereon. The hinge bars 520 pull the corresponding limit rods 501, so that the two limit rods 501 corresponding to the same sliding block 52 gradually approach the inner wall of the through - hole and finally abut against the inner wall of the through - hole (as Figure 8 shown), that is, two symmetrically - locked triangles are formed in the front and rear.

[0042] Due to the elastic property of the first spring 521, the angle between the corresponding two hinge bars 520 is maintained at a specified angle. When the center of the cylinder block 7 is initially located at the center position of the frame 1, the vertical projection of the through - hole covers the corresponding limit rod 501, ensuring that the subsequent limit rod 501 can move upward and insert into the corresponding through - hole.

[0043] As Figure 4 、 Figure 6 and Figure 7 shown, the delay driving group includes a fitting cylinder 545. The upper end surface of the L - shaped frame 50 is fixedly provided with a fitting cylinder 545. The inner wall of the fitting cylinder 545 is provided with a spiral groove 546. A fitting rod 547 that cooperates with the spiral groove 546 is fixedly provided on the rotating shaft 540.

[0044] As Figure 7 shown, a vertically - oriented lag groove 548 is opened inside the fitting cylinder 545. The lag groove 548 is located below the spiral groove 546 and communicates with the spiral groove 546. The fitting rod 547 is located in the lag groove 548 before cooperating with the spiral groove 546.

[0045] As Figure 1 and Figure 4As shown, the positioning mechanism 5 further includes a mounting bracket 55. L-shaped mounting brackets 55 are fixedly arranged on the left and right end faces of the lifting seat 500. A mounting plate 550 is fixedly arranged on the upper end face of the vertical section of the mounting bracket 55. The lower end face of the pressing strip 502 is hinged to the corresponding mounting plate 550. A plurality of pressing rods 551 for positioning the waist-shaped grooves on the left and right end faces of the outer shell of the cylinder block 7 are arranged on each pressing strip 502. Limiting strips 552 are fixedly arranged on the left and right end faces of the mounting plate 550. The two corresponding limiting strips 552 cooperate with each other to limit the rotation angle of the two corresponding pressing strips 502 within a set range all the time.

[0046] As Figure 4 shown, the plurality of pressing rods 551 on the same pressing strip 502 are arranged at equal intervals along the length direction of the pressing strip 502, and the axial direction of the pressing rod 551 is the same as the thickness direction of the pressing strip 502. A fixed circular plate 56 is fixedly arranged on the end face of the pressing rod 551 away from the pressing strip 502. A third spring 560 is fixedly arranged between the fixed circular plate 56 and the pressing strip 502.

[0047] As Figure 1 、 Figure 3 and Figure 5 shown, the locking unit 6 includes a moving rod 60. Two axially vertical and left-right symmetric moving rods 60 are arranged on the horizontal section of the L-shaped frame 50 in a vertically sliding manner. The two moving rods 60 are driven by an external hydraulic cylinder III (not shown in the figure) to move up and down. A locking plate 600 is fixedly arranged between two adjacent pressing strips 502. A locking groove is formed in the locking plate 600. The lower end of the inner wall of the locking groove and the upper end of the moving rod 60 are both chamfered. A mounting circular plate is fixedly sleeved on the moving rod 60. A pushing plate 601 is arranged above the moving rod 60. A fourth spring 602 is fixedly arranged between the pushing plate 601 and the mounting circular plate.

[0048] After the cylinder block 7 moves to the specified position on the moving carrier plate 4, the external hydraulic cylinder II works to lift the lifting seat 500. At this time, the two mounting brackets 55 drive the pressing strip 502 to move upward. The pressing strip 502 is located on the left and right sides of the cylinder block 7. Then the external hydraulic cylinder III works to drive the moving rod 60 to drive the mounting circular plate, the pushing plate 601 and the spring IV 602 to move upward synchronously. At this time, the pushing plate 601 is located above the moving rod 60. The pushing plate 601 moves to closely adhere to the lower end of the locking plate 600. At this time, the upper end of the moving rod 60 is located below the pushing plate 601 (the moving rod 60 is not inserted and engaged with the corresponding locking groove), contacts the corresponding two pressing strips 502, and pushes the pressing strip 502 to drive the pressing rod 551 thereon to approach the cylinder block 7. Finally, the pressing rod 551 contacts the cylinder block 7, and the spring III 560 is stretched, so as to perform preliminary limiting on the left and right directions of the cylinder block 7, and cooperate with the limiting plate 510 to perform preliminary limiting on the front and back directions of the cylinder block 7, so that the cylinder block 7 is directly above the lifting seat 500, and at the same time, the limiting rod 501 is located below the corresponding through hole.

[0049] Then the external hydraulic cylinder II continues to work, so that the limiting rod 501 moves upward through the corresponding through hole. In the above process, the lifting seat 500 drives the rotating shaft 540 and the matching rod 547 to move upward synchronously. The matching rod 547 slides in the lag groove 548. As the limiting rod 501 initially passes through the through hole, the matching rod 547 moves into the spiral groove 546. Thus, in the subsequent upward movement process of the lifting seat 500, the rotating shaft 540 drives the gear 541 to rotate synchronously, that is, drives the limiting rod 501 to perform positioning and guiding on the cylinder block.

[0050] Secondly, in the above process, the spring III 560 is in a stretched state. The lifting seat 500 drives the mounting plates 550 and the pressing strips 502 on the left and right sides to move upward synchronously. During the upward movement of the pressing strip 502, part of the pressing rods 551 on the same mounting plate 550 are caught in the corresponding waist-shaped grooves, and the remaining pressing rods 551 continue to tightly press the cylinder block 7. Therefore, the pressing rods 551 located in the waist-shaped grooves perform capture and limiting on the cylinder block 7, and the pressing rods 551 located outside the waist-shaped grooves press the cylinder block 7, improving the stability in the subsequent process.

[0051] After the above process and the positioning process of the limiting rod 501, the cylinder block 7 is positioned and limited to the specified position on the lifting seat 500, completing the positioning and guiding process of the cylinder block 7. The external hydraulic cylinder III continues to work to insert the moving rod 60 into the corresponding locking groove, so as to complete the pin locking of all the pressing strips 502.

[0052] Such as Figure 1 、 Figure 3 and Figure 4As shown, the locking unit 6 further includes a loop bar 61. The loop bar 61 is fixedly arranged on the two moving rods 60 together. Two pressing plates 610 distributed front and back are fixedly arranged on the loop bar 61. The upper end of the pressing plate 610 is an isosceles trapezoid with a larger upper part and a smaller lower part. The pressing plate 610 presses the corresponding two hinge bars 520 to lock the corresponding two limiting rods 501.

[0053] As the moving rod 60 drives the continuous upward movement of the loop bar 61, the pressing strip 502 is locked. The pressing plate 610 moves upward between the corresponding two hinge bars 520, so that a fixed triangular frame is jointly formed between the pressing plate 610 and the corresponding two hinge bars 520, improving the positioning stability while locking the position of the limiting rod 501. Secondly, the inclined surface at the upper part of the pressing plate 610 facilitates the upward movement of the pressing plate 610 to squeeze into the corresponding two hinge bars 520.

[0054] In summary, the positioning and guiding of the cylinder block 7 and the locking process after the positioning and guiding are completed, improving the stability during the subsequent process of the moving carrier plate 4 driving the cylinder block 7 into the 3D printing device. When the cylinder block 7 is about to be moved into the 3D printing device, all structures are reset, and at this time, the cylinder block 7 is located at the designated position on the moving carrier plate 4.

[0055] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0056] In addition, the terms "first", "second", "No. 1", "No. 2" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "No. 1", "No. 2" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0057] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "connected", "installed", 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. "Arranged" can also only represent a positional relationship. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] The embodiments of the specific implementation manners are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. An automatic positioning device for the cylinder body of a 3D printing device, characterized in that, Including: A frame (1), on the upper end surface of the frame (1), a U-shaped base plate (2) is fixedly arranged. On the upper end surface of the base plate (2), a plurality of balls (3) arranged circumferentially along the U-shaped area are rollingly arranged. A movable carrier plate (4) is placed on the upper end surface of the base plate (2); A positioning mechanism (5) for limiting a cylinder body (7) is arranged on the frame (1). The positioning mechanism (5) includes an L-shaped frame (50). An L-shaped frame (50) is arranged on the movable carrier plate (4). On the upper end surface of the horizontal section of the L-shaped frame (50), a lifting seat (500) is slidably arranged up and down through two connecting rods distributed left and right. On both the front and rear sides of the lifting seat (500), two limiting rods (501) distributed left and right and with vertical axes are arranged. On both the left and right sides of the lifting seat (500), two pressing strips (502) distributed front and rear are arranged. A driving unit (54) is arranged on the L-shaped frame (50). The driving unit (54) includes an opposite movement group and a delay driving group. When the lifting seat (500) rises, the limiting rods (501) are driven to insert into through holes at corresponding positions at the bottom of the cylinder body (7). The delay driving group is used to drive the opposite movement group to drive the limiting rods (501) to move and abut against the inner wall of the through hole, so that the four limiting rods (501) cooperate with each other to form two locking triangles. At the same time, the cylinder body (7) is centered front and rear, and the pressing strips (502) on both sides press and center the cylinder body (7) left and right; A preliminary limiting unit is arranged on the upper end surface of the base plate (2). The preliminary limiting unit includes a longitudinal cylinder (51) and a limiting plate (510) for preliminary limiting. A locking unit (6) is arranged on the L-shaped frame (50). The locking unit includes a moving rod (60) for locking the pressing strip (502) and an extrusion plate (610) for locking the limiting rod (501).

2. The automatic positioning device for the cylinder body of a 3D printing device according to claim 1, wherein: Two rows of longitudinally arranged cylinders (51) are fixedly arranged on the upper end surface of the base plate (2). The telescopic end of the longitudinal cylinder (51) is fixedly provided with an inverted L-shaped limiting plate (510). The inner corner area of the limiting plate (510) faces downward. The limiting plates (510) distributed front and rear are symmetric front and rear.

3. The automatic positioning device for the cylinder body of a 3D printing device according to claim 1, characterized in that: The positioning mechanism (5) includes sliding blocks (52). On both the front and rear end surfaces of the lifting seat (500), sliding blocks (52) are slidably arranged front and rear through connecting shafts. On the opposite surfaces of the two sliding blocks (52), two symmetrically arranged hinge bars (520) are hinged. All the limiting rods (501) are fixedly arranged on the upper end surfaces of the corresponding hinge bars (520). A first spring (521) is fixedly arranged between two adjacent hinge bars (520).

4. An automatic positioning device for a cylinder body of a 3D printing device according to claim 1, characterized in that: The diameter of the limiting rod (501) is smaller than the diameter of the through hole at the bottom of the cylinder body (7).

5. The automatic positioning device for the cylinder body of a 3D printing device according to claim 1, wherein: A placing groove (53) is formed through the lifting seat (500) in the front-back direction. The facing movement group includes a rotating shaft (540). The rotating shaft (540) is rotatably arranged on the lower end surface of the lifting seat (500) and penetrates into the placing groove (53). The rotating shaft (540) is located at the central position of the lifting seat (500). A gear (541) is fixedly sleeved on the rotating shaft (540). Two racks (542) which are distributed left and right and meshed with the gear (541) are slidably arranged on the inner wall of the placing groove (53) in the front-back direction. The two racks (542) are symmetric about the left-right center of the axis of the rotating shaft (540). The sliding blocks (52) correspond to the racks (542) one by one. A horizontal rod (543) with an axis extending from the front to the back is fixedly arranged on the end surface of the sliding block (52) facing the corresponding rack (542). The horizontal rod (543) slides through the corresponding rack (542) in the front-back direction. A second spring (544) is fixedly sleeved on the horizontal rod (543) between the rack (542) and the sliding block (52).

6. The automatic positioning device for the cylinder body of a 3D printing device according to claim 5, characterized in that: The delay driving group includes a matching cylinder (545). The matching cylinder (545) is fixedly arranged on the upper end surface of the L-shaped frame (50). A spiral groove (546) is formed in the inner wall of the matching cylinder (545). A matching rod (547) which is matched with the spiral groove (546) is fixedly arranged on the rotating shaft (540). A vertical lag groove (548) is formed inside the matching cylinder (545). The lag groove (548) is located below the spiral groove (546) and communicated with the spiral groove (546). The matching rod (547) is located in the lag groove (548) before being matched with the spiral groove (546).

7. An automatic positioning device for a cylinder body of a 3D printing device according to claim 1, characterized in that: The positioning mechanism (5) further includes a mounting frame (55). L-shaped mounting frames (55) are fixedly arranged on the left and right end surfaces of the lifting seat (500). A mounting plate (550) is fixedly arranged on the upper end surface of the vertical section of the mounting frame (55). The lower end surface of the pressing strip (502) is hinged to the corresponding mounting plate (550). A plurality of pressing rods (551) for positioning the waist-shaped grooves on the left and right end surfaces of the outer shell of the cylinder (7) are arranged on the pressing strip (502). Limiting strips (552) are fixedly arranged on the left and right end surfaces of the mounting plate (550). The two corresponding limiting strips (552) cooperate with each other to limit the rotation angle of the two corresponding pressing strips (502) within a set range all the time.

8. The automatic positioning device for the cylinder body of a 3D printing device according to claim 7, characterized in that: The plurality of pressing rods (551) on the same pressing strip (502) are arranged at equal intervals along the length direction of the pressing strip (502). The axis direction of the pressing rod (551) is the same as the thickness direction of the pressing strip (502). A fixed circular plate (56) is fixedly arranged on the end surface of the pressing rod (551) away from the pressing strip (502). A third spring (560) is fixedly arranged between the fixed circular plate (56) and the pressing strip (502).

9. The automatic positioning device for the cylinder body of a 3D printing device according to claim 1, characterized in that: The locking unit (6) includes a moving rod (60). Two moving rods (60) with vertical axes and symmetrically arranged left and right are slidably arranged up and down on the horizontal section of the L-shaped frame (50). The two moving rods (60) are driven by an external hydraulic cylinder three to move up and down. A locking plate (600) is fixedly arranged between adjacent two pressing strips (502). A locking groove is formed on the locking plate (600). The lower end of the inner wall of the locking groove and the upper end of the moving rod (60) are both chamfered. An installation circular plate is fixedly sleeved on the moving rod (60). A pushing plate (601) is arranged above the moving rod (60). A fourth spring (602) is fixedly arranged between the pushing plate (601) and the installation circular plate.

10. The automatic positioning device for the cylinder body of a 3D printing device according to claim 9, characterized in that: The locking unit (6) further includes a loop strip (61). The loop strip (61) is fixedly arranged on the two moving rods (60). Two pressing plates (610) distributed front and back are fixedly arranged on the loop strip (61). The upper end of the pressing plate (610) is an isosceles trapezoid with a smaller upper part and a larger lower part.

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