A large gantry production line heavy workbench exchange system and method

Abstract

The application provides a large gantry production line heavy workbench exchange system and method, belongs to numerical control milling machine technical field, the system includes bed and transition position drag board, the bed is provided with bed static pressure guide rail; The bottom of numerical control gantry milling machine drag board is provided with static pressure guide rail surface, which is placed on the bed static pressure guide rail through the static pressure guide rail surface; The transition position drag board is provided with transition position drag board guide rail, the numerical control gantry milling machine drag board is provided with numerical control gantry milling machine drag board guide rail correspondingly, the bottom of the workbench is provided with the roller matched with the transition position drag board guide rail and the numerical control gantry milling machine drag board guide rail; The power supply device is used to drive the workbench to move along the guide rail between the numerical control gantry milling machine drag board and the transition position drag board. The automatic, precise and lossless exchange of heavy workbench between processes is realized.

Description

Technical Field

[0001] This invention belongs to the field of CNC milling machine technology, and particularly relates to a heavy-duty worktable exchange system and method for a large gantry production line. Background Technology

[0002] In high-end equipment manufacturing sectors such as aerospace, energy and power, and shipbuilding, core components are often characterized by large size, heavy weight, complex structure, and high machining precision requirements. CNC gantry milling machines, as key machine tools for machining such large parts, directly impact the quality of the final product and the production cycle with their machining efficiency and precision. In actual production, a large part typically requires multiple different processes to complete all machining steps. A single CNC gantry milling machine often lacks all the necessary machining capabilities or tooling configurations; therefore, the conversion and transfer of parts between different processes becomes an inevitable step.

[0003] To address the issue of transferring large parts between multiple machine tools, the common practice in existing technologies is as follows: after a part completes its current process on one machine tool, the operator must first disassemble all the clamping fixtures securing the part to the machine tool's worktable. Then, using overhead cranes or other lifting equipment, the part is lifted and transported to the vicinity of the next machine tool. It is then re-aligned, positioned, and clamped onto the new machine tool's worktable before the next processing step can begin. This is a discrete operation mode that relies on manual operation in conjunction with large lifting equipment.

[0004] However, in the existing operating model, the entire process of hoisting, transferring, repositioning, and clamping is time-consuming, requires a large amount of manual intervention and coordination, and occupies valuable workshop space and lifting equipment resources, resulting in a slow overall production line pace and low production efficiency. Secondly, each reclamping introduces new positioning reference errors, which, after accumulating over multiple processes, can seriously affect the final machining accuracy and geometric tolerances of the parts. In addition, some large parts are highly susceptible to damage during hoisting and transfer due to uneven stress.

[0005] Therefore, the present invention provides a heavy-duty workbench exchange system and method for a large gantry production line. Summary of the Invention

[0006] This invention provides a heavy-duty workbench exchange system and method for a large gantry production line, which at least solves the problems of low efficiency, cumulative accuracy error and easy damage to parts caused by hoisting, transportation and repeated clamping in the prior art.

[0007] In a first aspect, embodiments of this application provide a heavy-duty workbench exchange system for a large gantry production line, the system comprising: The bed and transition slide are fixed to the foundation, and the bed is equipped with a bed static pressure guide rail; The CNC gantry milling machine slide has a hydrostatic guide surface at its bottom. The CNC gantry milling machine slide is placed on the bed hydrostatic guide via the hydrostatic guide surface and can reciprocate along the bed hydrostatic guide. The worktable is used to support and hold the parts to be processed. The clamping and lifting device installed on the slide of the CNC gantry milling machine is used to push downward to clamp the worktable during machining, and to retract upward to lift the worktable during exchange. The positioning device installed on the slide of the CNC gantry milling machine is used to extend the positioning sleeve and insert it into the positioning hole of the worktable during machining to achieve positioning, and to retract the positioning sleeve during exchange; the transition slide is provided with a transition slide guide rail, and the CNC gantry milling machine slide is correspondingly provided with a CNC gantry milling machine slide guide rail; the bottom of the worktable is provided with rollers that cooperate with the transition slide guide rail and the CNC gantry milling machine slide guide rail. The power supply device installed on the transition slide is used to drive the worktable to move along the guide rail between the CNC gantry milling machine slide and the transition slide.

[0008] Furthermore, the clamping and lifting device includes a clamping and lifting cylinder, the cylinder body of which is fixed to the slide of the CNC gantry milling machine, and the piston rod end of which is connected to the guide rail of the slide of the CNC gantry milling machine. The extension and retraction of the piston rod of the clamping and lifting cylinder drives the slide guide rail of the CNC gantry milling machine to rise and fall.

[0009] Furthermore, the positioning device includes a positioning cylinder, the cylinder body of which is fixed to the slide of the CNC gantry milling machine, and the piston rod end of the positioning cylinder is connected to the positioning sleeve. The extension and retraction of the piston rod of the positioning cylinder drives the positioning sleeve to insert into or retract from the positioning hole on the worktable.

[0010] Furthermore, the power supply device includes a gear and rack structure and a hydraulic cylinder structure; The gear rack structure includes a rack, a gear meshing with the rack, and a gear motor that drives the gear. The hydraulic cylinder structure includes a hydraulic cylinder, the cylinder body of which is fixed to the transition slide plate, and the piston rod end of the hydraulic cylinder is connected to the gear motor mounting plate. The gear motor is fixed to the gear motor mounting plate, and the bottom of the gear motor mounting plate is provided with a hydrostatic guide surface. The gear motor mounting plate cooperates with the hydrostatic guide surface fixed to the transition slide plate through the hydrostatic guide surface, so that the gear motor mounting plate can move along the hydrostatic guide under the drive of the hydraulic cylinder.

[0011] Secondly, the present invention provides a method for exchanging heavy-duty workbenches on a large gantry production line, applied to a system as described in the above aspects, the method comprising: Step S1: When a process change is required, if the worktable carrying the part that has completed the previous process is located on the transition slide, the power supply device is controlled to move the worktable along the guide rail to the slide of the CNC gantry milling machine. Step S2: Control the positioning device to work, so that the positioning sleeve extends and inserts into the positioning hole of the worktable, thereby completing the positioning of the worktable on the slide of the CNC gantry milling machine; Step S3: Control the clamping and lifting device to work, so that the piston rod of the clamping and lifting cylinder extends and drives the CNC gantry milling machine slide guide rail to descend until it contacts and presses against the bottom surface of the worktable, thus completing the clamping and fixing of the worktable; Step S4: Start the CNC gantry milling machine to process the parts fixed on the worktable in this operation; Step S5: After processing is completed, control the clamping and lifting device and the positioning device to release the restriction on the worktable, and then control the power supply device to move the worktable back to the transition slide along the guide rail; Step S6: Remove the worktable and workpiece carrying the processed parts, and transport the other worktable carrying the parts to be processed to the transition slide, repeating steps S1 to S5.

[0012] Further, in step S1, the operation of the control power supply device specifically includes: Start the gear motor to drive the gear to rotate. The gear meshes with the rack and pushes the worktable to the end of the rack. The hydraulic cylinder is activated, pushing the gear motor mounting plate and the gear rack structure fixed thereto forward a preset distance. The worktable is pushed to the predetermined position on the slide of the CNC gantry milling machine; The hydraulic cylinder retracts, driving the gear motor mounting plate back to its initial position, wherein the preset distance... This is the total stroke required for the worktable to move from the transition slide to the CNC gantry milling machine slide.

[0013] Further, in step S2, the control and positioning device specifically operates by: extending the piston rod of the control positioning cylinder to push the positioning sleeve upward by a preset distance. And insert it into the positioning hole of the worktable, wherein the preset distance The vertical travel required for the positioning sleeve to move from the disengaged position to the insertion into the positioning hole.

[0014] Further, in step S3, the control clamping and lifting device specifically operates by: controlling the piston rod of the clamping and lifting cylinder to extend, driving the CNC gantry milling machine's slide guide rail to move downwards by a preset distance. Until it contacts and presses firmly against the bottom surface of the workbench, where the preset distance is... The vertical travel required for the slide guide rail of a CNC gantry milling machine to descend from the lifting position to the clamping position.

[0015] Furthermore, in step S5, the release of the restriction specifically includes: controlling the piston rod of the clamping and lifting cylinder to retract, driving the CNC gantry milling machine's slide guide rail to move upward by the preset distance. Until it re-engages with the rollers at the bottom of the worktable, lifting the worktable; the piston rod of the positioning cylinder retracts, driving the positioning sleeve to move downwards by the preset distance. This causes the positioning sleeve to exit the positioning hole of the worktable.

[0016] Furthermore, in step S5, the reverse operation of the control power supply device specifically includes: The hydraulic cylinder is activated, pushing the gear motor mounting plate and gear rack structure forward, so that the gear re-meshes with the end of the rack at the bottom of the worktable; The gear motor is started to rotate in the opposite direction, driving the worktable to move towards the transition slide plate; when the worktable moves to the first end of the rack, the hydraulic cylinder retracts, driving the gear motor mounting plate and the gear rack structure back to the initial position on the transition slide plate.

[0017] As can be seen from the above technical solutions, the present invention has the following advantages: The heavy-duty workbench exchange system for the large gantry production line provided in this application eliminates the multiple positioning reference errors introduced by repeated disassembly, transfer and re-clamping of parts through a mechanism of one-time clamping of the workbench and precise positioning and locking on multiple machine tools, thus ensuring the cumulative accuracy of multi-process composite machining.

[0018] The worktable is supported and driven smoothly by the guide rail throughout the exchange process, avoiding the risk of deformation or damage to parts caused by suspension and shaking in traditional hoisting, and providing a reliable guarantee for the manufacturing of large precision parts. Attached Figure Description

[0019] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1This is an isometric drawing of the overall structure of a heavy-duty workbench exchange system for a large gantry production line according to the present invention.

[0021] Figure 2 This is a top view of the overall structure of a heavy-duty workbench exchange system for a large gantry production line according to the present invention.

[0022] Figure 3 This is a cross-sectional view of the workbench, CNC gantry milling machine slide, bed and foundation connection of a heavy-duty workbench exchange system for a large gantry production line according to the present invention.

[0023] Figure 4 This is a partial enlarged view A of the connection between the slide and the bed of a CNC gantry milling machine in a heavy-duty workbench exchange system for a large gantry production line according to the present invention.

[0024] Figure 5 This is a top view of the heavy-duty workbench exchange system for a large gantry production line according to the present invention, when the workbench is located on the transition slide.

[0025] Figure 6 This is a top view of the transition slide of the heavy-duty workbench exchange system for a large gantry production line according to the present invention, when there is no workbench.

[0026] Figure 7 This is a partial enlarged view (B) of the gear motor mounting plate position when the transition slide of the heavy-duty workbench exchange system for a large gantry production line of the present invention has no workbench.

[0027] Figure 8 This is a cross-sectional view of the connection between the motor mounting plate and the transition slide plate in a heavy-duty workbench exchange system for a large gantry production line according to the present invention.

[0028] Figure 9 This is a view of the heavy-duty workbench exchange system for a large gantry production line according to the present invention, with the workbench located on the slide of a CNC gantry milling machine.

[0029] Figure 10 This is a partial enlarged view (C) of the connection between the CNC gantry milling machine slide guide rail and the worktable in a heavy-duty worktable exchange system for a large gantry production line according to the present invention.

[0030] Figure 11 This is a partially enlarged view (D) of the gear and rack structure of a heavy-duty workbench exchange system for a large gantry production line according to the present invention.

[0031] Figure 12 This is a top view of the heavy-duty workbench exchange system for a large gantry production line according to the present invention, with the workbench located on the slide of a CNC milling machine.

[0032] Figure 13This is a cross-sectional view of the clamping and lifting device of a heavy-duty workbench exchange system for a large gantry production line according to the present invention.

[0033] Figure 14 This is a cross-sectional view of the positioning device of a heavy-duty workbench exchange system for a large gantry production line according to the present invention.

[0034] Reference numerals: 1-CNC gantry milling machine; 2-Worktable; 3-Positioning hole; 4-Positioning sleeve; 5-CNC gantry milling machine slide; 6-Bed hydrostatic guide rail; 7-Positioning cylinder; 8-Bed; 9-Foundation; 10-Transition slide; 11-Cylinder; 12-Roller; 13-Hydraulic cylinder; 14-Transition slide guide rail; 15-CNC gantry milling machine slide guide rail; 16-Gear motor mounting plate; 17-Gear motor; 18-Hydrostatic guide rail surface; 19-Hydrostatic guide rail; 20-Rack. Detailed Implementation

[0035] To make the purpose, features, and advantages of this application more apparent and understandable, specific embodiments and accompanying drawings will be used to clearly and completely describe the technical solution protected by this application. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0036] This application provides a heavy-duty workbench exchange system and method for a large gantry production line, which solves the current urgent technical problem of realizing automatic, precise, and non-destructive exchange of heavy-duty workbenches between processes.

[0037] The technical solutions proposed in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0038] This application provides a heavy-duty workbench exchange system for a large gantry production line, the system comprising: The bed 8 and the transition slide 10 are fixed on the foundation 9, and the bed 8 is provided with a bed static pressure guide rail 6; The CNC gantry milling machine slide 5 has a hydrostatic guide surface 18 at its bottom. The CNC gantry milling machine slide 5 is placed on the bed hydrostatic guide 6 through the hydrostatic guide surface 18 and can reciprocate along the bed hydrostatic guide 6. Workbench 2 is used to support and hold the parts to be processed; The clamping and lifting device installed on the slide 5 of the CNC gantry milling machine is used to push downward to clamp the worktable 2 during machining, and to retract upward to lift the worktable 2 during exchange. The positioning device installed on the CNC gantry milling machine slide 5 is used to extend the positioning sleeve 4 and insert it into the positioning hole 3 of the worktable 2 to achieve positioning during machining, and to retract the positioning sleeve 4 during exchange; the transition slide 10 is provided with a transition slide guide 14, the CNC gantry milling machine slide 5 is correspondingly provided with a CNC gantry milling machine slide guide 15, and the bottom of the worktable 2 is provided with rollers 12 that cooperate with the transition slide guide 14 and the CNC gantry milling machine slide guide 15; The power supply device installed on the transition slide 10 is used to drive the worktable 2 to move along the guide rail between the CNC gantry milling machine slide 5 and the transition slide 10.

[0039] In an exemplary embodiment, the clamping and lifting device includes a clamping and lifting cylinder 11. The cylinder body of the clamping and lifting cylinder 11 is fixed on the slide 5 of the CNC gantry milling machine. The piston rod end of the clamping and lifting cylinder 11 is connected to the guide rail 15 of the CNC gantry milling machine slide. The extension and retraction of the piston rod of the clamping and lifting cylinder 11 drives the CNC gantry milling machine slide guide rail 15 to rise and fall, thereby realizing the clamping and lifting action.

[0040] According to another embodiment of the present invention, the positioning device includes a positioning cylinder 7, the cylinder body of the positioning cylinder 7 is fixed on the slide plate 5 of the CNC gantry milling machine, the piston rod end of the positioning cylinder 7 is connected to the positioning sleeve 4, and the positioning sleeve 4 is inserted into or removed from the positioning hole 3 on the worktable 2 by the extension and retraction of the piston rod of the positioning cylinder 7.

[0041] It should be noted that the power supply device includes a gear and rack structure and a hydraulic cylinder structure; The gear rack structure includes a rack 20, a gear meshing with the rack 20, and a gear motor 17 that drives the gear. The hydraulic cylinder structure includes a hydraulic cylinder 13, the cylinder body of which is fixed to the transition slide plate 10, and the piston rod end of the hydraulic cylinder 13 is connected to the gear motor mounting plate 16. The gear motor 17 is fixed to the gear motor mounting plate 16, and the bottom of the gear motor mounting plate 16 is provided with a hydrostatic guide surface 18. The gear motor mounting plate 16 cooperates with the hydrostatic guide rail 19 fixed on the transition slide plate 10 through the hydrostatic guide surface 18, so that the gear motor mounting plate 16 can move along the hydrostatic guide rail 19 under the drive of the hydraulic cylinder 13.

[0042] In one embodiment, such as Figure 1 , Figure 2 As shown, a heavy-duty workbench exchange system for a large gantry production line includes a CNC gantry milling machine 1, which is used to process the required parts, and the parts are fixed on the workbench 2.

[0043] like Figure 13 , Figure 14 As shown, the worktable 2 is fixed on the slide 5 of the CNC gantry milling machine by a clamping device and a positioning device.

[0044] like Figure 3 , Figure 4 As shown, the CNC gantry milling machine slide is placed on the bed hydrostatic guide rail 6. The hydrostatic guide rail surface 18 of the CNC gantry milling machine 1 is in contact with the bed hydrostatic guide rail 6. The bed hydrostatic guide rail 6 and the bed 8 are integrated. The CNC gantry milling machine slide 5 can move relative to the bed 8 along the bed hydrostatic guide rail 6. The bed 8 is fixed on the foundation 9, thereby realizing the movement of the part in the X-axis direction.

[0045] like Figure 6 As shown, when the previous part processing operation is completed and the CNC gantry milling machine 1 needs to perform processing, the worktable 2 is located on the transition slide 10. The transition slide 10 is fixed on the foundation 9. Power is provided by the gear and rack structure and hydraulic cylinder structure on the transition slide 10 to move the worktable 2 along the transition slide guide rail 14 and the CNC gantry milling machine slide guide rail 15 to the slide on the CNC gantry milling machine 1. Then, it is fixed on the CNC gantry milling machine slide 5 by the clamping device and the positioning device for part processing. In this example, the moving distance of the worktable 2 along the transition slide guide rail 14 and the CNC gantry milling machine slide guide rail 15 to the slide on the CNC gantry milling machine 1 is 530 mm.

[0046] like Figure 7 As shown, in the hydraulic cylinder structure, one end of the hydraulic cylinder 13 is connected to the transition slide plate 10, and the other end is connected to the gear motor mounting plate 16 in the gear and rack structure.

[0047] like Figure 8 As shown, the motor is fixed on the gear motor mounting plate 16, and the gear motor mounting plate 16 moves relative to the static pressure guide rail 19 via the transition plate 10.

[0048] The static pressure guide rail 19 is fixed on the transition slide plate 10, and the static pressure guide rail surface 18 is located on the gear motor mounting plate 16. The static pressure guide rail surface 18 is in contact with the static pressure guide rail 19, thereby enabling the gear motor 17 to move relative to the transition slide plate 10 along the static pressure guide rail 19.

[0049] like Figure 11 As shown, the rack 20 in the gear and rack structure is fixed on the worktable 2.

[0050] The transition slide guide 14 and the CNC gantry milling machine slide guide 15 are in contact with the roller 12, which is fixed on the worktable 2.

[0051] like Figure 10As shown, the clamping device includes a clamping and lifting cylinder 11 and a CNC gantry milling machine slide guide rail 15.

[0052] The transition slide rail 14 is fixed on the transition slide 10.

[0053] One end of the clamping and lifting cylinder 11 is connected to the guide rail 15 of the CNC gantry milling machine slide, and the other end is fixed on the CNC gantry milling machine slide 5.

[0054] like Figure 14 As shown, the positioning device includes a positioning sleeve 4, a positioning hole 3, and a positioning cylinder 7.

[0055] The positioning hole 3 is located on the worktable 2. One end of the positioning cylinder 7 is connected to the positioning sleeve 4, and the other end is fixed on the slide 5 of the CNC gantry milling machine.

[0056] The positioning device works by moving the positioning sleeve 4 into the positioning hole 3 with the positioning cylinder 7, so that the positioning sleeve 4 is concentric with the positioning hole 3, thereby achieving positioning.

[0057] The clamping device works by having the clamping lifting cylinder 11 drive the CNC gantry milling machine slide guide 15 to move downwards, so that the CNC gantry milling machine slide guide 15 contacts the worktable 2, thereby achieving clamping. In this example, the moving distance of the positioning sleeve 4 in the clamping device is 35 mm, that is, it moves downwards 35 mm from when the CNC gantry milling machine slide guide 15 contacts the roller 12, and the CNC gantry milling machine slide guide 15 contacts the worktable 2.

[0058] like Figure 5 , Figure 9 , Figure 12 As shown, after the CNC gantry milling machine 1 completes the machining of the part, the part is located on the CNC gantry milling machine slide 5. The clamping device and positioning device release the restriction on the worktable 2. Power is provided by the gear rack structure and hydraulic cylinder structure to move the worktable 2 along the CNC gantry milling machine slide 5 and the transition slide guide rail 14 to the transition slide 10 for the next machining process.

[0059] The workflow of the gear and rack structure and hydraulic cylinder structure in moving the worktable 2 from the transition slide 10 to the CNC gantry milling machine slide 5 is as follows: First, the gear and rack structure moves to send the worktable 2 to the end of the rack 20. Then, the hydraulic cylinder structure drives the rack 20 forward to the positioning position by moving the gear motor mounting plate 16. Finally, the hydraulic cylinder structure drives the gear motor mounting plate 16 back to the initial position. In this example, the moving distance of the worktable 2 from the transition slide 10 to the CNC gantry milling machine slide 5 is 53 mm.

[0060] The working process of moving the worktable 2 from the CNC gantry milling machine slide 5 to the transition slide 10 is as follows: First, the hydraulic cylinder 13 drives the gear motor mounting plate 16 to the end of the rack 20. Then, the gear rack structure moves the worktable 2. When it reaches the beginning of the rack 20, the hydraulic cylinder 13 retracts, driving the gear motor mounting plate 16 and the rack 20 to move onto the transition slide 10.

[0061] The working mode of releasing the clamping device from the worktable 2 is as follows: the clamping and lifting cylinder 11 drives the CNC gantry milling machine slide guide 15 to move upward until the CNC gantry milling machine slide guide 15 contacts the roller 12, and then the position of the clamping and lifting cylinder 11 is locked. In this example, the clamping device moves a distance of 35 mm from the clamping state to the lifting roller 12.

[0062] The working method to release the restriction of the positioning device on the worktable 2 is that the positioning cylinder 7 drives the positioning sleeve 4 to move downward, so that the positioning sleeve 4 leaves the positioning hole 3, so that the positioning sleeve 4 and the positioning hole 3 are not in contact in the horizontal direction.

[0063] The present invention also provides a method for exchanging heavy-duty workbenches in a large gantry production line, applicable to the systems described in the above aspects, the method comprising: Step S1: When a process change is required, if the worktable 2 carrying the part that has completed the previous process is located on the transition slide 10, then control the power supply device to move the worktable 2 along the guide rail to the CNC gantry milling machine slide 5. Step S2: Control the positioning device to work, so that the positioning sleeve 4 extends out and is inserted into the positioning hole 3 of the worktable 2, thereby completing the positioning of the worktable 2 on the slide 5 of the CNC gantry milling machine; Step S3: Control the clamping and lifting device to work, so that the piston rod of the clamping and lifting cylinder 11 extends and drives the CNC gantry milling machine slide guide rail 15 to descend until it contacts and presses against the bottom surface of the worktable 2, thus completing the clamping and fixing of the worktable 2. Step S4: Start the CNC gantry milling machine 1 and perform this process on the part fixed on the worktable 2; Step S5: After processing is completed, control the clamping and lifting device and the positioning device to release the restriction on the worktable 2, and then control the power supply device to move the worktable 2 back to the transition slide plate 10 along the guide rail; Step S6: Remove the worktable 2 carrying the processed parts and the workpiece, and transport the other worktable 2 carrying the parts to be processed to the transition slide 10. Repeat steps S1 to S5 to achieve continuous automated production.

[0064] In step S1, the operation of the control power supply device specifically includes: Start the gear motor 17 to drive the gear to rotate. The gear meshes with the rack 20 and pushes the worktable 2 to the end of the rack 20. The hydraulic cylinder 13 is activated, pushing the gear motor mounting plate 16 and the gear rack structure fixed thereto forward a preset distance. Push the worktable 2 to the predetermined position on the slide 5 of the CNC gantry milling machine; The hydraulic cylinder 13 retracts, driving the gear motor mounting plate 16 back to its initial position, wherein the preset distance... This refers to the total travel required for the worktable 2 to move from the transition slide 10 to the CNC gantry milling machine slide 5. It should be noted that the preset distance... .

[0065] In step S2, the control and positioning device works by extending the piston rod of the control positioning cylinder 7, which pushes the positioning sleeve 4 upward by a preset distance. And insert it into the positioning hole 3 of the worktable 2, wherein the preset distance This refers to the vertical travel required for the positioning sleeve 4 to move from the disengaged position to the insertion position hole 3. It should be noted that the preset distance... .

[0066] In step S3, the control clamping and lifting device works specifically by: controlling the piston rod of the clamping and lifting cylinder 11 to extend, driving the CNC gantry milling machine slide guide rail 15 to move downwards by a preset distance. Until it contacts and presses firmly against the bottom surface of workbench 2, wherein the preset distance This refers to the vertical travel required for the slide guide 15 of the CNC gantry milling machine to descend from the jacking position (in contact with roller 12) to the clamping position (in contact with the worktable 2). It should be noted that the preset distance... .

[0067] In step S5, the release of the restriction specifically includes: controlling the piston rod of the clamping and lifting cylinder 11 to retract, driving the CNC gantry milling machine slide guide rail 15 to move upward by the preset distance. Until it re-contacts the roller 12 at the bottom of the worktable 2, lifting the worktable 2; control the piston rod of the positioning cylinder 7 to retract, driving the positioning sleeve 4 to move downwards by the preset distance. This causes the positioning sleeve 4 to exit the positioning hole 3 of the workbench 2.

[0068] In step S5, the reverse operation of the control power supply device specifically includes: Start the hydraulic cylinder 13 to push the gear motor mounting plate 16 and the gear rack structure forward, so that the gear re-meshes with the end of the rack 20 at the bottom of the worktable 2; The gear motor 17 is started to rotate in the opposite direction, driving the worktable 2 to move towards the transition slide 10; when the worktable 2 moves to the head end of the rack 20, the hydraulic cylinder 13 retracts, driving the gear motor mounting plate 16 and the gear rack structure back to the initial position on the transition slide 10.

[0069] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0070] Any changes, modifications, substitutions, and variations made to the embodiments without departing from the principles and spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A heavy-duty workbench exchange system for a large gantry production line, characterized in that, The system includes: The bed (8) and transition slide (10) are fixed on the foundation (9), and the bed (8) is provided with bed static pressure guide rail (6). The CNC gantry milling machine slide (5) has a hydrostatic guide surface (18) at its bottom. The CNC gantry milling machine slide (5) is placed on the bed hydrostatic guide (6) through the hydrostatic guide surface (18) and can reciprocate along the bed hydrostatic guide (6). The workbench (2) is used to support and fix the parts to be processed; The clamping and lifting device installed on the slide (5) of the CNC gantry milling machine is used to push downward to clamp the worktable (2) during processing and to retract upward to lift the worktable (2) during exchange. The positioning device installed on the CNC gantry milling machine slide (5) is used to extend the positioning sleeve (4) and insert it into the positioning hole (3) of the worktable (2) to achieve positioning during processing, and to retract the positioning sleeve (4) during exchange; the transition slide (10) is provided with a transition slide guide rail (14), the CNC gantry milling machine slide (5) is correspondingly provided with a CNC gantry milling machine slide guide rail (15), and the bottom of the worktable (2) is provided with rollers (12) that cooperate with the transition slide guide rail (14) and the CNC gantry milling machine slide guide rail (15). The power supply device disposed on the transition slide (10) is used to drive the worktable (2) to move along the guide rail between the CNC gantry milling machine slide (5) and the transition slide (10).

2. The heavy-duty workbench exchange system for a large gantry production line according to claim 1, characterized in that, The clamping and lifting device includes a clamping and lifting cylinder (11). The cylinder body of the clamping and lifting cylinder (11) is fixed on the slide (5) of the CNC gantry milling machine. The piston rod end of the clamping and lifting cylinder (11) is connected to the guide rail (15) of the slide of the CNC gantry milling machine. The extension and retraction of the piston rod of the clamping and lifting cylinder (11) drives the slide rail (15) of the CNC gantry milling machine to rise and fall.

3. The heavy-duty workbench exchange system for a large gantry production line according to claim 2, characterized in that, The positioning device includes a positioning cylinder (7), the cylinder body of which is fixed on the slide (5) of the CNC gantry milling machine. The piston rod end of the positioning cylinder (7) is connected to the positioning sleeve (4). The positioning sleeve (4) is inserted into or removed from the positioning hole (3) on the worktable (2) by the extension and retraction of the piston rod of the positioning cylinder (7).

4. The heavy-duty workbench exchange system for a large gantry production line according to claim 3, characterized in that, The power supply device includes a gear and rack structure and a hydraulic cylinder structure; The gear rack structure includes a rack (20), a gear meshing with the rack (20), and a gear motor (17) that drives the gear. The hydraulic cylinder structure includes a hydraulic cylinder (13), the cylinder body of which is fixed on the transition slide plate (10), and the piston rod end of the hydraulic cylinder (13) is connected to the gear motor mounting plate (16); the gear motor (17) is fixed on the gear motor mounting plate (16), and the bottom of the gear motor mounting plate (16) is provided with a hydrostatic guide surface (18). The gear motor mounting plate (16) cooperates with the hydrostatic guide rail (19) fixed on the transition slide plate (10) through the hydrostatic guide surface (18), so that the gear motor mounting plate (16) can move along the hydrostatic guide rail (19) under the drive of the hydraulic cylinder (13).

5. A method for exchanging heavy-duty workbenches in a large gantry production line, applied to the system as described in any one of claims 1 to 4, characterized in that, The method includes: Step S1: When a process change is required, if the worktable (2) carrying the part that has completed the previous process is located on the transition slide (10), the power supply device is controlled to work and the worktable (2) is moved along the guide rail to the slide (5) of the CNC gantry milling machine. Step S2: Control the positioning device to work, so that the positioning sleeve (4) extends out and is inserted into the positioning hole (3) of the worktable (2) to complete the positioning of the worktable (2) on the slide (5) of the CNC gantry milling machine; Step S3: Control the clamping and lifting device to work, so that the piston rod of the clamping and lifting cylinder (11) extends and drives the CNC gantry milling machine slide guide rail (15) to descend until it contacts and presses against the bottom surface of the worktable (2), thus completing the clamping and fixing of the worktable (2); Step S4: Start the CNC gantry milling machine (1) and perform this process on the part fixed on the worktable (2); Step S5: After processing is completed, control the clamping and lifting device and the positioning device to release the restriction on the worktable (2), and then control the power supply device to move the worktable (2) back to the transition slide (10) along the guide rail. Step S6: Remove the worktable (2) carrying the processed parts and the workpiece, and transport the other worktable (2) carrying the parts to be processed to the transition slide (10), repeating steps S1 to S5.

6. The method according to claim 5, characterized in that, In step S1, the operation of the control power supply device specifically includes: Start the gear motor (17) to drive the gear to rotate. The gear meshes with the rack (20) and pushes the worktable (2) to the end of the rack (20). The hydraulic cylinder (13) is activated, pushing the gear motor mounting plate (16) and the gear rack structure fixed thereto forward a preset distance. The worktable (2) is pushed to the predetermined position on the slide (5) of the CNC gantry milling machine; The hydraulic cylinder (13) retracts, driving the gear motor mounting plate (16) back to its initial position, wherein the preset distance... The total stroke required for the worktable (2) to move from the transition slide (10) to the CNC gantry milling machine slide (5).

7. The method according to claim 6, characterized in that, In step S2, the control and positioning device works specifically by: extending the piston rod of the control positioning cylinder (7) to push the positioning sleeve (4) upward by a preset distance. And insert it into the positioning hole (3) of the worktable (2), wherein the preset distance The vertical travel required for the positioning sleeve (4) to move from the disengaged position to the insertion positioning hole (3).

8. The method according to claim 7, characterized in that, In step S3, the control clamping and lifting device works specifically by: controlling the piston rod of the clamping and lifting cylinder (11) to extend, driving the CNC gantry milling machine slide guide rail (15) to move downward by a preset distance. Until it contacts and presses firmly against the bottom surface of the workbench (2), wherein the preset distance The vertical stroke required for the slide guide rail (15) of the CNC gantry milling machine to descend from the lifting position to the clamping position.

9. The method according to claim 8, characterized in that, In step S5, the release of the restriction specifically includes: controlling the piston rod of the clamping and lifting cylinder (11) to retract, driving the CNC gantry milling machine slide guide rail (15) to move upward by the preset distance. Until it re-contacts the roller (12) at the bottom of the worktable (2), lifting the worktable (2); control the piston rod of the positioning cylinder (7) to retract, driving the positioning sleeve (4) to move downward by the preset distance. This causes the positioning sleeve (4) to exit the positioning hole (3) of the worktable (2).

10. The method according to claim 9, characterized in that, In step S5, the reverse operation of the control power supply device specifically includes: Start the hydraulic cylinder (13) to push the gear motor mounting plate (16) and the gear rack structure forward, so that the gear re-meshes with the end of the rack (20) at the bottom of the worktable (2); The gear motor (17) is started to rotate in the opposite direction, driving the worktable (2) to move towards the transition slide (10); when the worktable (2) moves to the head end of the rack (20), the hydraulic cylinder (13) retracts, driving the gear motor mounting plate (16) and the gear rack structure back to the initial position on the transition slide (10).

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