Conveying device for laser cutting machine

Abstract

The invention relates to the technical field of laser cutting machines, in particular to a conveying device for a laser cutting machine, which comprises a support assembly, a table board assembly and a driving assembly, the table board assembly comprises a first rack plate and a second rack plate, and the first rack plate and the second rack plate are used for supporting plates; the driving assembly comprises a cam driving shaft, the cam driving shaft comprises a plurality of columnar cams used for correspondingly driving the first rack plate and the second rack plate, and the conveying device further comprises a lifting assembly used for controlling the first rack plate and the second rack plate to alternately ascend and descend between an upper dead center and a lower dead center; when the first rack plate or the second rack plate starts to move from an upper dead center to a lower dead center, the first rack plate and the second rack plate are located at the position of the upper dead center. The cylindrical cam is used for driving, the first rack plate and the second rack plate alternately convey plates, sliding of the first rack plate and the second rack plate relative to the plates is reduced, and therefore the situation that the surfaces of the plates are scratched is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of laser cutting machines, and in particular to a conveying device for laser cutting machines. Background Art

[0002] Laser cutting utilizes a high-energy-density laser beam to heat the workpiece, rapidly raising its temperature to the material's boiling point in a very short time. This causes the material to vaporize, forming vapor. This vapor is ejected at a high velocity, creating an incision in the material as it is ejected. Due to its advantages of fast cutting speed, high precision, and high degree of automation, laser cutting machines are commonly used in the processing of various sheet materials, including metal and plastic. Within the automated production process of laser cutting machines, the transport of sheet material is a key component influencing overall processing efficiency.

[0003] The Chinese patent with authorization announcement number CN221695668U discloses a conveying device of a laser cutting machine, including a bracket assembly, a table assembly and a driving mechanism. The bracket assembly is provided with an installation space, the table assembly is movably arranged in the installation space, the table assembly is provided with an avoidance opening, the driving mechanism is arranged on the bracket assembly and drivenly connected to the table assembly, the driving mechanism includes a chain transmission assembly and a driving assembly, the chain transmission assembly includes a driving shaft, a first driving sprocket, a second driving sprocket, a driven shaft, a driven sprocket and a conveying chain, the driving shaft is rotatably arranged on the bracket assembly, the first driving sprocket is sleeved on the driving shaft, the driving assembly is drive-connected to the first driving sprocket, the second driving sprocket is sleeved on the driving shaft, the driven shaft is rotatably arranged on the bracket assembly and is spaced apart from the driving shaft, the driven sprocket is sleeved on the driven shaft, the conveying chain is sleeved on the second driving sprocket and the driven sprocket, and is drivenly connected to the table assembly, and the table assembly is used to place the plate to be processed.

[0004] However, the table assembly is driven by a conveyor chain, and there is a slight gap at the joint of the conveyor chain (usually about 0.1-0.5mm / chain link). In the long-distance conveying scenario of the laser cutting machine (usually 5-10m), the cumulative error caused by the conveyor chain gap can reach several millimeters. When the system is under load, the gap effect presents a distributed cumulative characteristic: the second active sprocket must first overcome the local link gap of the conveyor chain in the initial rotation before it can push the table assembly. Under heavy loads, these gaps may cause large changes in the length of the conveyor chain, thereby causing non-uniform movement of the table assembly along its length. This asynchronous movement can easily cause the table assembly and the plate to move relative to each other, resulting in scratches on the surface of the plate, which in turn affects the processing quality. Summary of the Invention

[0005] The present invention provides a conveying device for a laser cutting machine, which aims to solve the problem in the related art that when a tabletop component conveys a plate, it may slide relative to the plate, causing scratches on the surface of the plate.

[0006] A conveying device for a laser cutting machine of the present invention includes a bracket assembly, a table assembly and a driving assembly, wherein the table assembly includes a first rack plate and a second rack plate arranged alternately, and the first rack plate and the second rack plate are used to support the plate; the driving assembly includes a cam driving shaft, and the cam driving shaft includes a plurality of cylindrical cams for correspondingly driving the first rack plate and the second rack plate, and the cylindrical cams corresponding to the first rack plate and the cylindrical cams corresponding to the second rack plate are installed at an angle of 180°; the conveying device also includes a lifting assembly for controlling the first rack plate and the second rack plate to alternately rise and fall between the top dead center and the bottom dead center; wherein, when the first rack plate moves to the top dead center and moves along the plate conveying direction, the second rack plate is at the bottom dead center and moves in the opposite direction; when the second rack plate moves to the top dead center and moves along the plate conveying direction, the first rack plate is at the bottom dead center and moves in the opposite direction; and when the first rack plate or the second rack plate starts to move from the top dead center to the bottom dead center, the first rack plate and the second rack plate are at the top dead center position.

[0007] The advantages of the present invention are as follows: Each time, multiple first and second rack plates are provided under the sheet material. The first and second rack plates alternately move on their corresponding cylindrical cams, causing the first rack plate or the second rack plate to carry the sheet material at its top dead center, while the other second rack plate or the first rack plate moves in the opposite direction and resets at its bottom dead center. The first and second rack plates alternately convey the sheet material. Simultaneously, the first and second rack plates are driven by a cam drive shaft, so that each first rack plate or the second rack plate is driven by a cylindrical cam. This eliminates the accumulation of gaps between the rack plates, thereby reducing the chance of the first rack plate or the second rack plate rubbing against the sheet material surface when supporting it, thereby reducing scratches on the sheet material surface and preventing some first rack plates from supporting the sheet material while others slide relative to it. Furthermore, the cylindrical cams corresponding to the first and second rack plates have a phase difference of 180°, so that during synchronous rotation, the cylindrical cams ensure that the first and second rack plates accurately move in opposite directions and with a precise relative movement distance. When the first rack plate or the second rack plate moves from the top dead center to the bottom dead center, the first rack plate and the second rack plate are at the top dead center position, so that the first rack plate or the second rack plate has completed supporting the plate before resetting to the bottom dead center, so that the plate is maintained at the same height, ensuring stable transportation of the plate. At the same time, the plate does not need to move up and down, avoiding displacement deviation or vibration scratching caused by height difference.

[0008] Preferably, both ends of the first rack plate and the second rack plate are provided with a connecting seat, the connecting seat includes a lifting rod and a horizontally movable base, the lifting rod is vertically arranged and slidably connected to the horizontally movable base, the first rack plate and the second rack plate are fixed on the lifting rod of the connecting seat, the lifting assembly drives the first rack plate and the second rack plate to move up and down by driving the lifting rod, and the horizontally movable base is horizontally driven by a cylindrical cam.

[0009] The effect is that the connecting seat includes a lifting rod and a horizontally movable base, the horizontally movable base is horizontally driven by a cylindrical cam, the lifting rod is vertically arranged, and the first rack plate and the second rack plate are respectively fixed on their corresponding lifting rods. The lifting assembly drives the first rack plate and the second rack plate to rise and fall by driving the lifting rod, thereby completely decoupling the horizontal movement and vertical movement of the first rack plate and the second rack plate, eliminating the energy loss and structural deformation caused by the composite motion, and ensuring the trajectory of the first rack plate and the second rack plate.

[0010] Preferably, the lifting assembly includes a synchronous drive rod and a linear drive member. The synchronous drive rod is arranged horizontally, and a drive groove is opened on the synchronous drive rod. The drive groove has a horizontal section. A roller is installed on the lifting rod, and the roller is in the drive groove. The linear drive member drives the lifting rod to move up and down through the synchronous drive rod.

[0011] The effect is that the linear drive member drives the synchronous drive rod to move. The synchronous drive rod is provided with a drive slot. The roller on the lifting rod is located in the drive slot. The position of the drive slot is moved to raise and lower the roller. The synchronous drive rod can move synchronously under the action of the linear drive member. The roller can reduce the friction between the lifting rod and the synchronous drive rod. The horizontal section of the drive slot allows the roller to roll along the horizontal section of the drive slot when the lifting rod moves horizontally.

[0012] Preferably, the driving groove is Z-shaped, the synchronous driving rod is arranged to slide horizontally through the support rail fixed on the bracket assembly, the linear driving member drives the synchronous driving rod to move horizontally, and the roller drives the lifting rod to move up and down when it moves along the middle inclined part of the driving groove.

[0013] The effect is that: the driving groove is Z-shaped, and the linear driving part can move the synchronous driving rod horizontally. At this time, the support rail is used to bear the gravity of the plate and reduce deformation, thereby ensuring that the first rack plate and the second rack plate support the plate. The linear driving part drives the synchronous driving rod to move horizontally, so that the roller moves along the middle inclined position of the driving groove to realize the rising or falling of the lifting rod.

[0014] Preferably, the driving groove is in a straight line shape, and the linear driving member pushes the synchronous driving rod to move vertically up and down, thereby causing the roller to drive the lifting rod to move up and down.

[0015] Preferably, a slide groove is provided on the horizontal movable base, the length direction of the slide groove is parallel to the conveying direction of the plate, a slider is slidably arranged in the slide groove, the lifting rod is vertically slidably connected to the slider, and a spring is provided at each end of the slider along the conveying direction of the plate, and the spring drives the slider to return to the middle of the slide groove through the pre-tightening force.

[0016] The effect is that the slider slides horizontally within the chute. When the first or second rack plate drives the sheet material to move horizontally or stop, the cylindrical cam, at the moment of reversal, uses the preload of the spring to convert the reverse inertial kinetic energy generated by the first or second rack plate into elastic potential energy. This reduces the possibility of the sheet material failing to move synchronously with the first or second rack plate due to excessive slider acceleration, thereby helping to reduce scratches on the sheet material surface.

[0017] Preferably, the cam drive shaft further includes an inner rod and an adjusting sleeve, the inner rod has a polygonal cross section, and the cylindrical cam and the adjusting sleeve are alternately sleeved on the inner rod.

[0018] The effect is that the cylindrical cam and the adjusting sleeve are alternately sleeved on the inner rod in sequence, so that the installation of the cam drive shaft is relatively simple, and the position of the cylindrical cam can be accurately adjusted through the adjusting sleeve.

[0019] Preferably, the bracket assembly includes a hollow longitudinal beam, a slide rail is provided inside the longitudinal beam, the slide rail includes an outer U-shaped frame, an inner U-shaped frame and a rolling body, the outer U-shaped frame is fixed inside the longitudinal beam, the inner U-shaped frame is inside the outer U-shaped frame, and both ends of the inner U-shaped frame have a blocking portion formed by bending inward, and a V-shaped groove is provided on the side wall of the horizontally movable base for cooperating with the rolling body, and the rolling body is maintained in contact with the outer U-shaped frame through the inner U-shaped frame.

[0020] The result is that the outer U-shaped frame is fixed inside the longitudinal beam, while the inner U-shaped frame is located inside the outer U-shaped frame. The rolling elements are connected by rolling in the V-shaped grooves, thus keeping the entire slide rail inside the longitudinal beam, reducing the impact of debris on the slide rail. The ends of the inner U-shaped frame are bent inward to ensure that the inner U-shaped frame maintains a correct alignment with the horizontal movable base, preventing accidental separation.

[0021] Preferably, a mounting arm is provided at the upper end of the lifting rod, one end of the mounting arm is fixed on the lifting rod, and the other end passes through the longitudinal beam and is fixedly provided with a clamping block, a vertical clamping slot is provided on the clamping block, the lower end of the clamping slot is blocked and the upper end passes through, and the ends of the first rack plate and the second rack plate are inserted into the clamping slot from top to bottom.

[0022] The effect is that the lower end of the slot is blocked and the upper end is penetrated, so that the first rack plate and the second rack plate can be directly inserted into the slot, so that the first rack plate and the second rack plate can be replaced more conveniently.

[0023] Preferably, at least one drive motor is connected to the cam drive shaft in its length direction.

[0024] The effect is that the drive motor is used to drive the cam drive shaft. When two or more drive motors are set to start at the same time, the deformation resistance of the inner rod can be increased, ensuring that the drive motor drives the cam drive shaft to rotate synchronously, thereby ensuring that the plate will not be displaced relative to the first rack plate or the second rack plate.

[0025] By adopting the above technical solution, the beneficial effects of the present invention are: The present invention provides the following advantages: the first and second rack plates alternately move along their corresponding cylindrical cams, causing the first rack plate or the second rack plate to support the sheet at its top dead center, while the second rack plate or the first rack plate reverses and resets at its bottom dead center. Each first rack plate or the second rack plate is driven by a cylindrical cam, eliminating the accumulation of backlash between the first rack plate and the second rack plate when driving the sheet, thereby reducing the chance of the first rack plate or the second rack plate scraping against the sheet surface when supporting it, and thus reducing scratches on the sheet surface. The cylindrical cams and adjustment sleeves are alternately mounted on the inner rod, simplifying installation of the cam drive shaft and enabling precise adjustment of the cylindrical cam position via the adjustment sleeve. The slider slides horizontally within the chute. When the first rack plate or the second rack plate drives the sheet horizontally or stops, the cylindrical cam, at the moment of reversal, utilizes the preload of the spring to convert the reverse inertial kinetic energy generated by the first rack plate or the second rack plate into elastic potential energy. This reduces the situation where the plate fails to move synchronously with the first rack plate or the second rack plate due to excessive acceleration of the slider, thereby helping to reduce scratches on the surface of the plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 1 is a schematic structural diagram of a laser cutting machine according to an embodiment of the present invention; Figure 2 is a three-dimensional schematic diagram of a conveying device for a laser cutting machine in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure inside the longitudinal beam in an embodiment of the present invention; Figure 4 Schematic diagram of the positions of the first rack plate and the second rack plate in an embodiment of the present invention; Figure 5 2 is a schematic diagram of the connection structure of the lifting assembly in an embodiment of the present invention; Figure 6 2 is a schematic structural diagram of a clamping block in an embodiment of the present invention; Figure 7 is a schematic structural diagram of a slide rail in an embodiment of the present invention; Figure 8is a perspective view of a horizontally movable base in an embodiment of the present invention; Figure 9 yes Figure 7 Cross-sectional view in the AA direction; Figure 10 is a schematic structural diagram of a drive assembly in an embodiment of the present invention; Figure 11 It is a structural schematic diagram of a lifting assembly in another embodiment of the present invention.

[0027] Reference numerals: 11. Frame; 12. Moving gantry; 13. Laser cutting head; 2. Bracket assembly; 21. Crossbeam; 22. Longitudinal beam; 221. Gap slot; 3. Table assembly; 31. First rack plate; 32. Second rack plate; 4. Drive assembly; 41. Drive motor; 42. Cam drive shaft; 421. Inner rod; 422. Cylindrical cam; 423. Adjustment sleeve; 43. Mounting hole; 44. Connector; 5. Lifting assembly; 51. Synchronous drive rod; 52. Linear drive Parts; 53, support rail; 54, drive groove; 6, connecting seat; 61, lifting rod; 62, horizontal movable base; 621, slide groove; 622, slider; 623, linear bearing; 624, spring; 625, end cover; 626, long groove; 63, mounting arm; 64, clamping block; 641, clamping groove; 65, horizontal rod; 66, roller; 7, slide rail; 71, outer U-shaped frame; 72, inner U-shaped frame; 721, blocking part; 73, rolling element; 74, V-shaped groove. DETAILED DESCRIPTION

[0028] The following combination Figures 1 to 11 The embodiments of the present invention are described in detail, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0029] This embodiment discloses a conveying device for a laser cutting machine, such as Figure 1 and Figure 2As shown, the device is used for a laser cutting machine, including a support assembly 2, a table assembly 3 and a drive assembly 4. The laser cutting machine includes a frame 11, on which is mounted a movable gantry 12 that moves along the length of the frame 11. A laser cutting head 13 is provided on the movable gantry 12. The support assembly 2 is fixed to the frame 11, and the table assembly 3 is connected to the frame 11 through the support assembly 2. The table assembly 3 is arranged horizontally and extends along the length of the frame 11. The table assembly 3 is located directly below the laser cutting head 13. The upper surface of the table assembly 3 is used to place the plate to be cut. The drive assembly 4 is used to drive the table assembly 3 so that the plate on the table assembly 3 moves along the length of the table assembly 3 to reach the cutting position of the laser cutting head 13. In the process of moving the plate from one end of the table assembly 3 to the other end, on the one hand, the plate needs to be started and stopped. On the other hand, when the plate reaches the cutting position, it may move beyond the predetermined position due to mechanical inertia. At this time, the plate also needs to move in the opposite direction.

[0030] refer to Figure 2 and Figure 3 The bracket assembly 2 includes a crossbeam 21 and a longitudinal beam 22. There are two longitudinal beams 22 and they are arranged in parallel. The crossbeam 21 is perpendicular to the longitudinal beams 22 and its two ends are welded and fixed to the two longitudinal beams 22 respectively. The table assembly 3 includes a plurality of rack plates, and the length direction of the rack plates is perpendicular to the longitudinal beams 22. When the bracket assembly 2 is installed on the frame 11, the longitudinal beam 22 is parallel to the length direction of the frame 11. The plurality of rack plates are arranged at intervals along the length direction of the longitudinal beam 22, and the two adjacent rack plates are the first rack plate 31 and the second rack plate 32, that is, when multiple rack plates are arranged, the first rack plate 31 and the second rack plate 32 are arranged alternately. The toothed side of the rack plate is vertically facing upward and is used to support the plate. The drive assembly 4 is mounted on the longitudinal beam 22. The drive assembly 4 causes the first rack plate 31 and the second rack plate 32 to alternately move in opposite directions. Specifically, when the first rack plate 31 moves along the sheet conveying direction, the second rack plate 32 moves in the opposite direction of the sheet conveying direction; or, when the second rack plate 32 moves along the sheet conveying direction, the first rack plate 31 moves in the opposite direction of the sheet conveying direction. A lifting assembly 5 is also connected to the first rack plate 31 and the second rack plate 32. The lifting assembly 5 is used to control the vertical position of the first rack plate 31 and the second rack plate 32. The highest point of the first rack plate 31 and the second rack plate 32 is the same and serves as the top dead center. The lowest point of the first rack plate 31 and the second rack plate 32 is the same and serves as the bottom dead center. During the movement of the plate, the first rack plate 31 and the second rack plate 32 are alternately moved to the upper dead point position through the lifting assembly 5 to support the lower surface of the plate and when the first rack plate 31 or the second rack plate 32 moves along the plate conveying direction, the other second rack plate 32 or the first rack plate 31 are both at the lower dead point position.

[0031] In order to ensure that the height of the plate remains unchanged during the conveying process, when the first rack plate 31 or the second rack plate 32 starts to move toward the lower dead center, the first rack plate 31 and the second rack plate 32 should both be at the upper dead center position, that is, before the second rack plate 32 moves to the lower dead center, it must be ensured that the first rack plate 31 has moved from the lower dead center position to the upper dead center position; or before the first rack plate 31 moves to the lower dead center, it must be ensured that the second rack plate 32 has moved from the lower dead center position to the upper dead center position.

[0032] refer to Figure 4 and Figure 5 The lifting assembly 5 includes a synchronous drive rod 51 and a linear drive member 52. A lifting assembly 5 is connected to both ends of all the first rack plates 31, and a lifting assembly 5 is connected to both ends of all the second rack plates 32. The synchronous drive rod 51 is parallel to the longitudinal beam 22. In this embodiment, the longitudinal beam 22 is a square tube profile, and the synchronous drive rod 51 is located inside the longitudinal beam 22. A support rail 53 is fixed inside the longitudinal beam 22. The support rail 53 is parallel to the longitudinal beam 22 and is fixedly connected to the longitudinal beam 22 by bolts. One support rail 53 is fixed on each of the two vertical side walls of the longitudinal beam 22. The synchronous drive rods 51 of the two lifting assemblies 5 are slidably connected to the support rail 53. There is a structure for reducing friction between the support rail 53 and the synchronous drive rod 51, such as a ball bearing. The linear drive member 52 can be a hydraulic cylinder, a pneumatic cylinder, or an electric cylinder. The linear drive member 52 is fixed to the side wall of the longitudinal beam 22, and one end of the synchronous drive rod 51 is fixed to the output end of the linear drive member 52, allowing the linear drive member 52 to drive the synchronous drive rod 51 to move horizontally along the support rail 53. A drive slot 54 is defined in the side wall of the synchronous drive rod 51. This drive slot 54 is used to drive the rack plates 31 up and down. All first rack plates 31 are raised and lowered by the same synchronous drive rod 51, while all second rack plates 32 are raised and lowered by a different synchronous drive rod 51. The drive slot 54 is Z-shaped. When the linear drive member 52 drives the synchronous drive rod 51 to move horizontally, the first and second rack plates 31, 32 are driven by different synchronous drive rods 51 and move along the Z-shaped trajectory of the drive slot 54 to reach either the top dead center or the bottom dead center. Because the weight of the sheet material placed on the rack plates is transferred to the support rail 53 via the synchronous drive rod 51, which is fixed to the longitudinal beam 22, this reduces stress deformation of the synchronous drive rod 51 and improves stability.

[0033] refer to Figure 5 and Figure 6, both ends of the rack plate are provided with a connecting seat 6, and the connecting seat 6 is used to connect the lifting assembly 5 and the driving assembly 4. The connecting seat 6 includes a lifting rod 61 and a horizontally movable base 62. The lifting rod 61 is vertically arranged. The lower end of the lifting rod 61 is used to connect to the horizontally movable base 62, and a mounting arm 63 is fixedly provided on the upper end. One end of the mounting arm 63 is fixed to the lifting rod 61 by threaded connection or welding, and the other end is fixedly provided with a clamping block 64. A vertical clamping slot 641 is provided on the clamping block 64. The lower end of the clamping slot 641 is blocked and the upper end passes through. The clamping slot 641 is located on the side wall of the clamping block 64 facing the rack plate, and the width of the clamping slot 641 is equal to the thickness of the rack plate. Insert the rack plate into the clamping slot 641 from top to bottom for fixing, which facilitates the installation and replacement of the rack plate. Reference Figure 3 A clearance groove 221 for the mounting arm 63 to pass through is provided on the side wall of the longitudinal beam 22. The height of the clearance groove 221 can meet the up and down movement distance of the mounting arm 63, and the horizontal width of the clearance groove 221 can meet the reciprocating movement distance of the mounting arm 63 along the length direction of the longitudinal beam 22. The mounting arm 63 is disconnected from the middle and fixedly connected by a flange, and the position of the flange is inside the longitudinal beam 22. During installation, one end of the mounting arm 63 is installed inside the longitudinal beam 22 together with the connecting seat 6, and the other end is connected to the flange at the position of the clearance groove 221 for easy installation. The connecting seat 6 is completely located inside the longitudinal beam 22, which can protect the connecting seat 6, reduce the frequency of maintenance, and improve the accuracy of operation.

[0034] A horizontal rod 65 is fixed to the side wall of the lifting rod 61. A roller 66 is mounted on the horizontal rod 65. The roller 66 is located within the drive slot 54, reducing friction as the roller 66 moves within the drive slot 54. When the rack plate needs to move horizontally, the roller 66 on the lifting rod 61 moves along the horizontal portions at both ends of the drive slot 54. When the rack plate needs to be adjusted up and down, the roller 66 rolls along the inclined portion in the middle of the drive slot 54.

[0035] refer to Figure 7 、 Figure 8 and Figure 9The lower portion of the horizontally movable base 62 is connected to the drive assembly 4. A slot 621 is defined in the upper portion. The length of the slot 621 is parallel to the horizontal movement direction of the rack plate. A slider 622 is slidably mounted within the slot 621. The middle portion of the slider 622 is adapted to receive the lifting rod 61. A linear bearing 623 is sleeved around the outer portion of the lifting rod 61 and secured to the slider 622. These bearings reduce friction between the lifting rod 61 and the slider 622. Furthermore, a spring 624 is positioned at each end of the slider 622 along the horizontal movement direction of the rack plate. The axis of the spring 624 is parallel to the horizontal movement direction of the rack plate. One end of the spring 624 abuts against the sidewall of the slider 622, while the other end is secured to the sidewall of the horizontally movable base 62. The spring 624 is positioned within the slot 621. Both springs 624 have the same preload force and abut against the slider 622. As the slider 622 moves along the slide groove 621, the elastic force of one spring 624 increases while the elastic force of the other spring 624 decreases. The elastic forces of the two springs 624 are used to drive the slider 622 back to the center position of the horizontally movable base 62. To prevent the lifting rod 61 from rotating horizontally, the lower end of the lifting rod 61 is designed with a rectangular cross-section. A slot 626 is defined within the horizontally movable base 62 for inserting the lower end of the lifting rod 61. The distance between the two opposing side walls of the lower end of the lifting rod 61 is equal to the width of the slot 626, allowing the lifting rod 61 to slide along the slot 626 without rotating.

[0036] refer to Figure 9 and Figure 10The drive assembly 4 includes a drive motor 41 and a cam drive shaft 42. The cam drive shaft 42 includes an inner rod 421, a cylindrical cam 422, and an adjustment sleeve 423. The inner rod 421 has a rectangular or polygonal cross-section and is rotatably mounted within and parallel to the longitudinal beam 22. The drive motor 41 drives the inner rod 421 through a speed reducer. Multiple cylindrical cams 422 are provided, with each rack plate corresponding to a cylindrical cam 422. The cylindrical cams 422 corresponding to the first rack plate 31 and the second rack plate 32 are installed at an angle of 180 degrees. The inner holes of the cylindrical cams 422 engage with the inner rod 421, and the adjustment sleeve 423 is positioned between the two cylindrical cams 422. During installation, the cylindrical cams 422 and the adjustment sleeve 423 are alternately mounted on the inner rod 421 to assemble the cam drive shaft 42. When the inner rod 421 rotates, the multiple cylindrical cams 422 rotate coaxially and simultaneously drive the first rack plate 31 and the second rack plate 32 to move in opposite directions. A mounting hole 43 is defined in the lower portion of the horizontally movable base 62, and the cylindrical cams 422 are positioned within the mounting hole 43. A connector 44 is inserted into the side wall of the horizontally movable base 62, with one end of the connector 44 positioned within the contour groove of the cylindrical cams 422. The connector 44 moves along the contour groove of the cylindrical cams 422, thereby enabling the cylindrical cams 422 to drive the horizontally movable base 62 to move horizontally.

[0037] refer to Figure 3 and Figure 7 A slide rail 7 for mounting the horizontally movable base 62 is provided within the longitudinal beam 22. The slide rail 7 includes an outer U-shaped frame 71, an inner U-shaped frame 72, and a rolling element 73. The outer U-shaped frame 71 is a long strip structure with a U-shaped cross section. The outer U-shaped frame 71 is inserted into the longitudinal beam 22 along its length. Horizontal raceways for the rolling elements 73 are provided on both sides of the outer U-shaped frame 71. The inner U-shaped frame 72 serves as a retaining frame for the rolling elements 73. Holes are provided on the inner U-shaped frame 72 for mounting the rolling elements 73. The inner U-shaped frame 72 is located within the outer U-shaped frame 71. Each inner U-shaped frame 72 corresponds to a horizontally movable base 62, and multiple inner U-shaped frames 72 are provided within the outer U-shaped frame 71. Both ends of the inner U-shaped frame 72 have an inwardly bent blocking portion 721 to prevent the horizontally movable base 62 from detaching from the inner U-shaped frame 72. V-shaped grooves 74 are provided on the two opposite side walls of the horizontal movable base 62, and the rolling bodies 73 are rollingly connected in the V-shaped grooves 74, so that the horizontal movable base 62 can be stably connected to the longitudinal beam 22 through the cam drive shaft 42 and two rows of rolling bodies 73, and the friction between the horizontal movable base 62 and the longitudinal beam 22 can be reduced through the rolling bodies 73.

[0038] The working process of this embodiment is as follows: First, during the sheet cutting process, the first rack plate 31 and the second rack plate 32 are both moved to their top dead center positions by the lifting assembly 5, thereby jointly supporting the sheet. During sheet conveying, the second rack plate 32 is first moved horizontally by the corresponding synchronous drive rod 51, causing the roller 66 on the lifting rod 61 to roll along the inclined portion of the drive slot 54. As the lifting rod 61 descends, the second rack plate 32 is lowered to its bottom dead center position. At this time, the cam drive shaft 42 rotates under the action of the drive motor 41, and the cylindrical cams 422 corresponding to the first rack plate 31 and the second rack plate 32 both rotate. The cylindrical cams 422 corresponding to the first rack plate 31 push the first rack plate 31 to move in the conveying direction of the plate, and the second rack plate 32 moves in the opposite direction, so that the first rack plate 31 can drive the plate to complete a horizontal movement of a certain distance; then, the second rack plate 32 moves horizontally through the corresponding synchronous drive rod 51, causing the roller 66 on the lifting rod 61 to roll along the inclined part of the driving groove 54, thereby driving the second rack plate 32 to move from the lowest point to the highest position; when the second rack plate 32 is also in the upper When the first rack plate 31 reaches the bottom dead center, the synchronous drive rod 51 corresponding to the first rack plate 31 can be moved horizontally, causing the lifting rod 61 connected to the first rack plate 31 to move downward under the action of the roller 66, so that the first rack plate 31 moves to the bottom dead center position. At this time, the cam drive shaft 42 rotates again under the action of the drive motor 41, and the first rack plate 31 will move in the opposite direction of the sheet conveying direction under the action of the corresponding cylindrical cam 422, and the second rack plate 32 will drive the sheet to continue to move a distance along the sheet conveying direction. Then, the second rack plate 32 is restored to the top dead center position by the lifting assembly 5. Repeating this process multiple times can allow the sheet to be conveyed continuously in the same direction. Since each cylindrical cam 422 conveys a rack plate separately, no cumulative deviation will be generated. Each rack plate can directly convey the sheet without first eliminating the accumulated gap. In this way, the rack plate will not slide relative to the sheet surface during conveyance, reducing scratches on the sheet surface. During the conveying process, when the rack plate drives the sheet, the slider 622 lags behind the horizontally movable base 62 due to inertia. The spring 624 at the rear end of the slider 622, along the sheet conveying direction, compresses first. This also reduces the possibility of relative slippage between the sheet and the rack plate due to excessive inertia. In other embodiments, when the sheet is conveyed continuously, the sheet can first be driven by the rack plate as the rack plate moves upward from bottom to top to abut against the sheet, causing the rack plate to slide on the horizontally movable base 62 via the slider 622. This allows the sheet to move horizontally without stopping, but rather within a relatively small speed range.

[0039] In other embodiments, reference Figure 11The synchronous drive rod 51 is horizontally and movably arranged inside the longitudinal beam 22, and the linear drive member 52 is fixed on the longitudinal beam 22 in a vertical arrangement, so that the two ends of the synchronous drive rod 51 are respectively connected to a linear drive member 52, and the two linear drive members 52 move the synchronous drive rod 51 up and down at the same time. The driving groove 54 on the synchronous drive rod 51 is in a straight line and horizontally arranged.

[0040] In other embodiments, a plurality of synchronously rotating drive motors 41 may be arranged at intervals along the length direction of the cam drive shaft 42 , and the plurality of drive motors 41 synchronously drive the same cam drive shaft 42 .

[0041] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A conveying device for a laser cutting machine, comprising a support assembly (2), a table assembly (3) and a drive assembly (4), characterized in that: The tabletop assembly (3) comprises a first rack plate (31) and a second rack plate (32) that are alternately arranged, and the first rack plate (31) and the second rack plate (32) are used to support the plate; The driving assembly (4) includes a cam driving shaft (42), the cam driving shaft (42) includes a plurality of cylindrical cams (422) for correspondingly driving the first rack plate (31) and the second rack plate (32), the cylindrical cams (422) corresponding to the first rack plate (31) and the cylindrical cams (422) corresponding to the second rack plate (32) are installed at an angle interval of 180 degrees; The conveying device further comprises a lifting assembly (5) for controlling the first rack plate (31) and the second rack plate (32) to alternately lift and lower between the top dead center and the bottom dead center; When the first rack plate (31) moves to the top dead center and moves in the plate conveying direction, the second rack plate (32) is at the bottom dead center and moves in the opposite direction; when the second rack plate (32) moves to the top dead center and moves in the plate conveying direction, the first rack plate (31) is at the bottom dead center and moves in the opposite direction; and when the first rack plate (31) or the second rack plate (32) moves from the top dead center to the bottom dead center, the first rack plate (31) and the second rack plate (32) are at the top dead center.

2. A conveying device for a laser cutting machine according to claim 1, characterized in that: Both ends of the first rack plate (31) and the second rack plate (32) are provided with a connecting seat (6), the connecting seat (6) includes a lifting rod (61) and a horizontal movable base (62), the lifting rod (61) is vertically arranged and slidably connected to the horizontal movable base (62), the first rack plate (31) and the second rack plate (32) are fixed on the lifting rod (61) of the connecting seat (6), the lifting assembly (5) drives the lifting rod (61) to drive the first rack plate (31) and the second rack plate (32) to move up and down, and the horizontal movable base (62) is horizontally driven by the cylindrical cam (422).

3. A conveying device for a laser cutting machine according to claim 2, characterized in that: The lifting assembly (5) includes a synchronous drive rod (51) and a linear drive member (52). The synchronous drive rod (51) is arranged horizontally and is provided with a drive groove (54). The drive groove (54) has a horizontal section. A roller (66) is installed on the lifting rod (61). The roller (66) is located in the drive groove (54). The linear drive member (52) drives the lifting rod (61) to move up and down through the synchronous drive rod (51).

4. A conveying device for a laser cutting machine according to claim 3, characterized in that: The driving groove (54) is Z-shaped, and the synchronous driving rod (51) is arranged to slide horizontally through a support rail (53) fixed on the bracket assembly (2). The linear driving member (52) drives the synchronous driving rod (51) to move horizontally, and the roller (66) drives the lifting rod (61) to move up and down when moving along the middle inclined part of the driving groove (54).

5. The conveying device for a laser cutting machine according to claim 3, characterized in that: The driving groove (54) is in a straight line shape, and the linear driving member (52) pushes the synchronous driving rod (51) to move vertically up and down, thereby causing the roller (66) to drive the lifting rod (61) to move up and down.

6. A conveying device for a laser cutting machine according to any one of claims 2 to 5, characterized in that: The horizontal movable base (62) is provided with a slide groove (621), the length direction of the slide groove (621) is parallel to the conveying direction of the plate, a slider (622) is slidably provided in the slide groove (621), the lifting rod (61) is vertically slidably connected to the slider (622), and a spring (624) is provided at each end of the slider (622) along the conveying direction of the plate, and the spring (624) drives the slider (622) to return to the middle of the slide groove (621) through a pre-tightening force.

7. A conveying device for a laser cutting machine according to any one of claims 1 to 5, characterized in that: The cam drive shaft (42) further comprises an inner rod (421) and an adjusting sleeve (423); the inner rod (421) has a polygonal cross section, and the cylindrical cam (422) and the adjusting sleeve (423) are alternately sleeved on the inner rod (421).

8. The conveying device for a laser cutting machine according to claim 2, characterized in that: The support assembly (2) includes a hollow longitudinal beam (22), a slide rail (7) is provided inside the longitudinal beam (22), and the slide rail (7) includes an outer U-shaped frame (71), an inner U-shaped frame (72) and a rolling body (73), the outer U-shaped frame (71) is fixed inside the longitudinal beam (22), the inner U-shaped frame (72) is located inside the outer U-shaped frame (71), and both ends of the inner U-shaped frame (72) have a blocking portion (721) formed by bending inward, and a V-shaped groove (74) is provided on the side wall of the horizontal movable base (62) to cooperate with the rolling body (73), and the rolling body (73) is maintained in contact with the outer U-shaped frame (71) through the inner U-shaped frame (72).

9. The conveying device for a laser cutting machine according to claim 8, characterized in that: A mounting arm (63) is provided at the upper end of the lifting rod (61), one end of the mounting arm (63) is fixed to the lifting rod (61), and the other end passes through the longitudinal beam (22) and is fixedly provided with a clamping block (64), a vertical clamping slot (641) is provided on the clamping block (64), the lower end of the clamping slot (641) is blocked, and the upper end passes through, and the ends of the first rack plate (31) and the second rack plate (32) are inserted into the clamping slot (641) from top to bottom.

10. The conveying device for a laser cutting machine according to claim 1, characterized in that: At least one drive motor (41) is connected to the cam drive shaft (42) in its length direction.

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