A worktable of a double-end laser cutting machine

Abstract

The application discloses a workbench of a double-end laser cutting machine and belongs to the technical field of laser cutting equipment. The workbench comprises a main beam and bed frame beams with a double-layer structure on both sides. A labyrinth constant temperature mechanism is nested in the inner layer of the bed frame beam. The constant temperature mechanism is composed of a seamless square tube and staggered L-shaped metal baffles welded on the outer wall of the square tube. The metal baffles abut against the inner wall of the bed frame beam to form a turbulent liquid flow channel. The interior of the bed frame beam is divided into two sections by a partition plate, and the two sections are cross-connected through a double-cavity communication square tube at the bottom to realize the cross-connection of the flow channels of the bed frame beams on both sides. A temperature sensor is further installed on the bottom of the bed frame beam. The application forms S-shaped forced turbulence through the staggered baffles, greatly improves the heat exchange efficiency, and uses the baffles as stiffeners to improve the structural rigidity. In combination with the sectional communication waterway design, the temperature gradient of the bed body of the super-long double-end cutting machine is completely eliminated, the thermal deformation is effectively avoided, and the machining precision is ensured.

Description

Technical Field

[0001] This invention relates to the field of laser cutting equipment technology, and in particular to a worktable for a double-ended laser cutting machine. Background Technology

[0002] With the upgrading of modern industrial processing demands, dual-end laser cutting equipment has been widely used for cutting ultra-long pipes or large-format panels due to its ability to achieve one-time, high-efficiency cutting of workpieces. When working, the two laser generators located at opposite ends of the base operate simultaneously, resulting in double the heat generation on the same machine tool.

[0003] During the cutting process, a significant amount of heat is transferred to the worktable bed below, including residual heat from the laser penetrating the sheet metal, thermal radiation from the molten metal slag, and heat generated by the cutting head operating for extended periods. Due to the inherent thermal expansion and contraction properties of the cuboid machine tool structure, excessive heat accumulation in certain areas of the worktable can cause irreversible thermal deformation of the support beams and guide rail mounting surfaces. This thermal bending or torsional deformation severely compromises the mechanical backlash and micron-level positioning accuracy during dual-head collaborative cutting, ultimately leading to decreased processing quality and reduced yield.

[0004] Most existing worktables use a single structural support or rely solely on external fans for natural surface convection cooling, which cannot fundamentally overcome the overall heat dissipation limit caused by dual heat sources and is difficult to meet the precise constant temperature requirements of high-power, dual-end laser cutting equipment. Summary of the Invention

[0005] The purpose of this invention is to provide a worktable for a dual-end laser cutting machine. By embedding a labyrinthine constant temperature mechanism inside the load-bearing bed frame beam, it is possible to force turbulent stripping of the large amount of heat generated by the dual heat sources, eliminate the temperature gradient in each section of the bed, fundamentally prevent the machine tool from thermal deformation, and ensure the straightness of the high-precision guide rail and the cutting quality.

[0006] The objective of this invention is achieved through the following technical solution: a worktable for a dual-end laser cutting machine, comprising a main beam and two side frame beams, wherein the main beam and the frame beams are connected and fixed by several crossbeams, a support beam is provided on the outer side of the frame beams, and a guide rail is installed on the support beams, wherein the frame beams have a double-layer structure, the outer layer being a structural support layer, and the inner layer being a labyrinth-type constant temperature mechanism; The labyrinth-type thermostatic mechanism includes a seamless square tube, and the outer side of the seamless square tube is provided with staggered baffles; the labyrinth-type thermostatic mechanism inside the same bed frame beam consists of two sections, separated by a partition plate, and the partition plate is fixedly connected to the seamless square tube. It also includes a connecting square tube disposed between the two bed frame beams.

[0007] Furthermore, water supply pipes are provided on the inner sides of both ends of the seamless square tube. The water supply pipes include a central pipe and a connecting port installed through one side of the central pipe. The central pipe is welded and fixed to the end of the seamless square tube, and the seamless square tube has through holes at both the upper and lower openings of the central pipe.

[0008] Furthermore, square annular sealing blocks are fitted on the outer sides of both ends of the seamless square tube, and the inner side of the sealing block is connected to the seamless square tube, and the outer side is connected to the inner wall of the bed frame beam by welding.

[0009] Furthermore, the staggered spoiler is a discontinuously welded staggered metal baffle, which is an L-shaped metal block welded and fixed to the outer wall of the seamless square tube, and the outer surface of the metal baffle abuts against the inner wall of the bed frame beam.

[0010] Furthermore, the remaining volume between the outer wall of the seamless square tube and the inner wall of the bed frame beam is the liquid flow channel of the labyrinth-type constant temperature mechanism, and the interception surface area of ​​a single metal baffle is 1 / 4 of the cross-sectional area of ​​the liquid flow channel.

[0011] Furthermore, a set of opposing metal baffles is provided on the same vertical plane, with the two metal baffles located at the two ends of the diagonal of the seamless square tube section, and several sets of metal baffles are arranged in an alternating manner.

[0012] Furthermore, the staggered spoilers serve two purposes: first, they act as reinforcing ribs to improve the rigidity of the labyrinth-type thermostat; second, they force the coolant to follow an S-shaped tortuous path, breaking the laminar boundary layer of the fluid and forming turbulence, which greatly improves the convective heat transfer coefficient and rapidly strips away the heat radiated from both ends to the base surface.

[0013] Furthermore, the partition plate is welded to the outer wall of the seamless square tube, and its outer surface abuts against the inner wall of the bed frame beam. The bottom of the bed frame beam has through holes on both sides of the partition plate.

[0014] Furthermore, the connecting square tube has two cavities arranged side by side inside. Both ends of the connecting square tube are sealed by sealing plates. Each cavity has a connecting pipe port at the top of both ends. The connecting pipe port is inserted into the through hole at the bottom of the bed frame beam, so that the liquid flow channels belonging to the same section inside the two bed frame beams are interconnected. The connecting square tube is fixed to the bed frame beam by a bracket.

[0015] Furthermore, both ends of the bed frame beam are equipped with pipe restraints and are fixed with screws, forming an overall limiting ring structure with an opening angled downwards.

[0016] Furthermore, along the length of the workbench, the workbench is divided into multiple protection zones, and an array of temperature sensors is installed on the bottom surface of the bed frame beam in each protection zone.

[0017] In summary, compared with the prior art, the present invention has the following advantages: 1. In the present invention, the bed frame beam adopts a double-layer structure design, and the internal residual volume forms an independent liquid flow channel, which physically combines the structural support layer that carries the guide rail with the cooling system. Through the built-in seamless square tube and specially designed staggered metal baffle, the coolant is forced to form a high heat exchange efficiency S-shaped turbulence in the tube wall, which actively and quickly absorbs and carries away the extreme heat conducted to the bed by the double cutting head. 2. In the present invention, the staggered baffle is designed as a support structure connecting the seamless square tube and the inner wall of the bed frame beam, so that it can act as a turbulence generator and also serve as a high-strength internal reinforcing rib, which greatly improves the overall bending and torsional stiffness of the workbench. 3. In the present invention, the water jacket of the extra-long bed frame beam is divided into two sections by a partition plate, and the water channels of the inner cavities of the left and right bed frame beams are interconnected by a connecting square tube with a double cavity at the bottom. The segmented interconnected fluid layout avoids the temperature difference between the hot and cold ends caused by the long-distance unidirectional flow of coolant, and ensures that the coefficient of thermal expansion in the entire length of the workbench remains absolutely uniform. 4. In the present invention, an array of temperature sensors is pre-set at the bottom of the bed frame beam according to the protection zone division, which can monitor the thermal footprint of the dual cutting head in real time during dynamic operation, providing a hardware foundation for subsequent linkage control of water valve flow and realization of regional follow-up constant temperature. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the workbench frame structure of the present invention; Figure 3 This is a schematic cross-sectional view of a portion of the bed frame beam structure of the present invention; Figure 4 This is a schematic diagram of the labyrinth-type constant temperature mechanism of the present invention; Figure 5 This is an enlarged schematic diagram of a portion of structure A in this invention; Figure 6 This is an enlarged schematic diagram of a portion of the B structure of the present invention; Figure 7 This is a partial structural diagram of the labyrinth-type constant temperature mechanism of the present invention; Figure 8 This is a schematic diagram of a partial structure of the connecting square tube of the present invention.

[0019] In the diagram: 1-Main beam, 2-Bed frame beam, 3-Support beam, 4-Maze-type thermostatic mechanism, 5-Connecting square tube, 6-Pipeline constraint component; 41-Seamless square tube, 42-Staggered baffle, 43-Difference partition, 44-Water supply fitting, 45-Sealing block, 51-Cavity, 52-Sealing plate, 53-Connecting pipe port; 441 - Central conduit, 442 - Connector. Detailed Implementation

[0020] The technical solution of the present invention will be further described in detail below through specific embodiments, but the present invention is not limited to these embodiments.

[0021] Combination Figures 1 to 8 The worktable of a dual-end laser cutting machine shown includes a main beam 1 and two side bed frame beams 2. The main beam 1 and the bed frame beams 2 are connected and fixed by several cross beams. A support beam 3 is provided on the outside of the bed frame beam 2. A guide rail is installed on the support beam 3. The bed frame beam 2 has a double-layer structure, with the outer layer being a structural support layer and the inside being a labyrinth-type constant temperature mechanism 4. The labyrinth-type thermostatic mechanism 4 includes a seamless square tube 41, and an interlaced baffle 42 is provided on the outside of the seamless square tube 41; the labyrinth-type thermostatic mechanism 4 inside the same bed frame beam 2 consists of two sections, which are separated by a partition plate 43, and the partition plate 43 is fixedly connected to the seamless square tube 41. It also includes a connecting square tube 5 installed between the two bed frame beams 2.

[0022] The seamless square tube 41 has water supply fittings 44 on the inner sides of both ends. The water supply fittings 44 include a central pipe 441 and a connecting port 442 installed on one side of it. The central pipe 441 is welded and fixed to the end of the seamless square tube 41, and the seamless square tube 41 has through holes at the upper and lower openings of the central pipe 441.

[0023] Both ends of the seamless square tube 41 are fitted with square ring-shaped sealing blocks 45. The inner side of the sealing block 45 is connected to the seamless square tube 41, and the outer side is connected to the inner wall of the bed frame beam 2 by welding.

[0024] The staggered spoiler 42 is a discontinuously welded staggered metal baffle. The metal baffle is an L-shaped metal block welded and fixed to the outer wall of the seamless square tube 41. The outer surface of the metal baffle abuts against the inner wall of the bed frame beam 2.

[0025] The remaining volume between the outer wall of the seamless square tube 41 and the inner wall of the bed frame beam 2 is the liquid flow channel of the labyrinth-type constant temperature mechanism 4, and the interception surface area of ​​a single metal baffle is 1 / 4 of the cross-sectional area of ​​the liquid flow channel.

[0026] A set of opposing metal baffles is provided on the same vertical plane. The two metal baffles are located at the two ends of the diagonal of the seamless square tube 41 section, and several sets of metal baffles are arranged in an alternating manner.

[0027] The staggered baffle 42 has two functions: first, it acts as a reinforcing rib to improve the rigidity of the labyrinth-type thermostat 4; second, it forces the coolant to follow an S-shaped tortuous path, breaking the laminar boundary layer of the fluid and forming turbulence, which greatly improves the convective heat transfer coefficient and rapidly strips away the heat radiated from both ends to the surface of the base.

[0028] The partition plate 43 is welded to the outer wall of the seamless square tube 41, and its outer surface abuts against the inner wall of the bed frame beam 2. The bottom of the bed frame beam 2 has through holes on both sides of the partition plate 43.

[0029] The connecting square tube 5 has two cavities 51 arranged side by side inside. Both ends of the connecting square tube 5 are sealed by sealing plates 52. Each cavity 51 has a connecting pipe port 53 at the top of both ends. The connecting pipe port 53 is inserted into the through hole at the bottom of the bed frame beam 2, so that the liquid flow channels belonging to the same section inside the two bed frame beams 2 are connected to each other. The connecting square tube 5 is fixed to the bed frame beam 2 by a bracket.

[0030] Both ends of the bed frame beam 2 are equipped with pipe restraint components 6, which are fixed by screws. The whole structure presents a limiting ring structure with an opening angled downward.

[0031] Along the length of the workbench, the workbench is divided into multiple protection zones, and an array of temperature sensors is installed on the bottom surface of the bed frame beam 2 in each protection zone.

[0032] Working principle: When the dual-head laser cutting machine starts high-power processing, the dual cutting heads radiate a large amount of heat to the support beam 3 and the bed frame beam 2. At this time, the external chiller unit starts, and the coolant is injected into the double-layer flow channel of the bed frame beam 2 through the connecting port 442 on one side and the central pipe 441 from the through holes at both ends of the seamless square tube 41.

[0033] During fluid propulsion, the fluid encounters staggered L-shaped metal baffles (i.e., staggered baffles 42). The originally gentle laminar flow is forced to be repeatedly blocked, split, and converged, forcing the coolant to take a violent "S"-shaped tortuous path between the square tube and the inner wall of the bed frame, forming strong turbulence, breaking the fluid thermal boundary layer near the tube wall, increasing the convective heat transfer coefficient several times, and rapidly absorbing and carrying away the high temperature absorbed by the outer layer of the bed frame beam 2.

[0034] Meanwhile, due to the action of the partition plate 43 and the double-cavity connecting square tube 5, the coolant channels on the left and right sides form a cross-connected network. Combined with the different inlet and outlet water directions, the heat exchange in the front and rear sections of the worktable and the left and right bed frames is evenly neutralized. Not only is localized heat forcefully extracted, but the temperature along the entire length of the large worktable is dynamically locked at a highly consistent level, completely eliminating deflection deformation caused by heat and ensuring the high-speed, precise displacement of the dual-head laser. Furthermore, the L-shaped metal baffle, seamless square tube 41, and bed frame beam 2 constitute a dense internal skeleton support, ensuring that the bed frame beam maintains extremely high mechanical rigidity even when subjected to heavy plates and coolant hydrostatic pressure.

[0035] The embodiments of the present invention are not limited to those described above. Without departing from the spirit and scope of the present invention, those skilled in the art can make various changes and improvements to the present invention in form and detail, and these are all considered to fall within the protection scope of the present invention.

Claims

1. A worktable for a double-ended laser cutting machine, comprising a main beam (1) and two side frame beams (2), wherein the main beam (1) and the frame beams (2) are connected and fixed by a plurality of crossbeams, and a support beam (3) is provided on the outer side of the frame beams (2), and a guide rail is installed on the support beam (3), characterized in that: The bed frame beam (2) has a double-layer structure, with the outer layer being a structural support layer and the inner layer being a labyrinth-type constant temperature mechanism (4). The labyrinth-type thermostatic mechanism (4) includes a seamless square tube (41), and the outside of the seamless square tube (41) is provided with staggered baffles (42); the labyrinth-type thermostatic mechanism (4) inside the same bed frame beam (2) consists of two sections, separated by a partition plate (43), and the partition plate (43) is fixedly connected to the seamless square tube (41); It also includes a connecting square tube (5) disposed between the two bed frame beams (2); The seamless square tube (41) is provided with water supply pipe fittings (44) on the inner sides of both ends. The water supply pipe fittings (44) include a central pipe (441) and a connecting port (442) installed through one side. The central pipe (441) is welded and fixed to the end of the seamless square tube (41), and the seamless square tube (41) has through holes at the upper and lower openings of the central pipe (441). The seamless square tube (41) is fitted with square ring-shaped sealing blocks (45) on both outer sides. The inner side of the sealing block (45) is connected to the seamless square tube (41) and the outer side is connected to the inner wall of the bed frame beam (2) by welding. The staggered baffle (42) is a non-continuously welded staggered metal baffle. The metal baffle is an L-shaped metal block welded and fixed to the outer wall of the seamless square tube (41). The outer surface of the metal baffle abuts against the inner wall of the bed frame beam (2). The remaining volume between the outer wall of the seamless square tube (41) and the inner wall of the bed frame beam (2) is the liquid flow channel of the labyrinth thermostatic mechanism (4), and the interception surface area of ​​a single metal baffle is 1 / 4 of the cross-sectional area of ​​the liquid flow channel.

2. The worktable of a double-ended laser cutting machine according to claim 1, characterized in that: A set of opposing metal baffles is provided on the same vertical plane. The two metal baffles are located at the two ends of the diagonal of the cross section of the seamless square tube (41), and several sets of metal baffles are arranged in an alternating manner.

3. The worktable of a dual-end laser cutting machine according to claim 2, characterized in that: The partition plate (43) is welded to the outer wall of the seamless square tube (41), and its outer surface abuts against the inner wall of the bed frame beam (2). The bottom of the bed frame beam (2) has through holes on both sides of the partition plate (43).

4. The worktable of a dual-end laser cutting machine according to claim 3, characterized in that: The connecting square tube (5) has two cavities (51) arranged side by side inside. The two ends of the connecting square tube (5) are sealed by sealing plates (52). Each cavity (51) has a connecting pipe port (53) at the top of both ends. The connecting pipe port (53) is inserted into the through hole at the bottom of the bed frame beam (2), so that the liquid flow channels belonging to the same section inside the two bed frame beams (2) are interconnected. The connecting square tube (5) is fixed to the bed frame beam (2) by a bracket.

5. The worktable of a dual-end laser cutting machine according to claim 4, characterized in that: Both ends of the bed frame beam (2) are provided with pipe restraints (6) and are fixed by screws. The whole structure presents a limiting ring structure with the opening angled downward.

6. The worktable of a dual-end laser cutting machine according to claim 5, characterized in that: Along the length of the workbench, the workbench is divided into multiple protection zones, and an array of temperature sensors is installed on the bottom surface of the bed frame beam (2) in each protection zone.

Images