A gravity balance structure of a sub-cross beam applied to a gantry machine tool

Abstract

This invention relates to a gravity balancing structure for a secondary crossbeam used in a gantry milling machine, belonging to the field of machine tool processing technology. It includes a main crossbeam, a secondary crossbeam mounted on the main crossbeam, a gravity balancing mechanism slidably mounted on the secondary crossbeam, and a lubrication assembly at the end of the secondary crossbeam for lubricating the sliding of the gravity balancing mechanism. In use, the secondary crossbeam ensures that when the working mechanism moves on the main crossbeam, the gravity balancing mechanism balances the weight acting on the main crossbeam to the position of the secondary crossbeam, avoiding uncertainties caused by deformation of the main crossbeam and improving the accuracy of the machine tool. Furthermore, by providing a lubrication assembly at the end of the secondary crossbeam for lubricating the sliding of the gravity balancing mechanism, this invention prevents the secondary crossbeam from jamming when subjected to significant weight, and ensures smooth movement of the working mechanism through timed lubrication.

Description

Technical Field

[0001] This invention relates to the field of machine tool processing technology, specifically to a gravity balance structure for a secondary crossbeam applied to a gantry milling machine. Background Technology

[0002] CNC gantry milling machines are among the most widely used CNC machine tools, primarily used for machining larger parts. They can perform grooving, drilling, reaming, boring, and other operations. Due to their structural limitations, CNC gantry milling machines have a crossbeam installed between two columns, and the greater the distance between the two columns, the longer the crossbeam. Moving parts such as saddles need to be mounted on the crossbeam, and rams and spindles need to be installed on the saddles to meet the machining requirements. These components are often quite heavy, sometimes weighing several tons, and the crossbeam deforms significantly due to gravity. The deformation of the crossbeam varies depending on the position of the moving parts as they move laterally, making it difficult to guarantee machine accuracy and meet customer requirements.

[0003] For example, in the patent application document with application number 201120481259.4, a pulley-type cylinder balancing mechanism is disclosed, and it is specifically disclosed that the cylinder provides balancing power, which can reduce the load on the drive motor, thereby achieving the effect of balancing gravity.

[0004] In the above technical solution, due to the effect of gravity balance, the friction is usually transferred to the moving component of the cylinder. At this time, the cylinder has a large mass load, which increases the friction between the moving components when the cylinder moves on the moving component. This can easily lead to jamming. When the friction increases, the reciprocating sliding friction seriously damages the slide rail, causing the gravity balance to fail. Summary of the Invention

[0005] The purpose of this invention is to provide a gravity balance structure for the secondary crossbeam used in gantry milling machines.

[0006] The technical problem solved by this invention is: in the prior art, when the moving component is balanced by gravity on the machine tool, the friction is transferred to the moving component of the cylinder, which leads to severe wear of the moving component of the cylinder and the slide rail is very prone to jamming.

[0007] The present invention can be achieved through the following technical solution: a secondary crossbeam gravity balancing structure applied to a gantry milling machine, including a main crossbeam, a working mechanism that is moved by a power device on the main crossbeam, a secondary crossbeam on the main crossbeam, a gravity balancing mechanism that is slidably arranged on the secondary crossbeam, and a lubrication component for lubricating the sliding of the gravity balancing mechanism at the end of the secondary crossbeam.

[0008] A further technical improvement of the present invention is that: the gravity balancing mechanism includes a balancing cylinder, the balancing cylinder is fixedly mounted on a cylinder mounting plate, the cylinder mounting plate and the secondary crossbeam guide rail are slidably connected, and the secondary crossbeam guide rail is fixedly mounted on the secondary crossbeam.

[0009] A further technical improvement of the present invention is that: a secondary crossbeam guide rail for laterally sliding the gravity balance mechanism is fixed on the secondary crossbeam, and a connecting cylinder is slidably arranged on the secondary crossbeam guide rail. The output end of the connecting cylinder is used as a receiving push plate to guide the oil inside the lubrication assembly out.

[0010] A further technical improvement of the present invention is that an oil leakage hole is provided on the receiving push plate, and the oil leakage hole wets the lubricating sponge through the oil leakage pipe.

[0011] A further technical improvement of the present invention is that: the connecting cylinder is fixedly installed on the connecting support plate, and a movable push plate is fixed on the side of the connecting support plate by a movable cylinder. The movable push plate is U-shaped, and the lubricating sponge is fixedly installed inside the movable push plate.

[0012] A further technical improvement of the present invention is that: an oil receiving interface is provided at the bottom of the movable push plate, the oil receiving interface is connected to the input end of the discharge pipe, and a spray outlet for wetting the lubricating sponge is fixed inside the movable push plate, the spray outlet is connected to the oil leakage pipe.

[0013] A further technical improvement of the present invention is that: the lubrication assembly includes a lubricating oil tank, the lubricating oil tank is rotatably mounted on the top frame by a power device, the top frame is fixedly mounted on the sub-beam, the lubricating oil tank has an oil outlet, and the oil outlet is controlled by a control assembly.

[0014] A further technical improvement of the present invention is that: the control component includes an oil baffle, the oil baffle is slidably disposed on the oil outlet, an adjusting slide rod is fixed on the side of the oil baffle, an adjusting spring is fixed on the adjusting slide rod to provide the adjusting slide rod to rebound, an oil push plate is fixed at the bottom of the oil baffle, and a receiving push plate is fixed on the receiving push plate to cooperate with the oil push plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. In use, this application utilizes a secondary crossbeam to balance the weight acting on the main crossbeam onto the secondary crossbeam when the working mechanism moves on the main crossbeam. As long as the gravity balancing mechanism is relatively stable, the weight borne by the main crossbeam can be reduced, avoiding the uncertainty caused by the deformation of the main crossbeam and improving the accuracy of the machine tool. Furthermore, this application provides a lubrication component at the end of the secondary crossbeam for lubricating the sliding of the gravity balancing mechanism. When the secondary crossbeam bears a large weight, the lubrication component provides timed lubrication to prevent jamming and ensure smooth movement of the working mechanism.

[0017] 2. By installing the secondary crossbeam on both sides of the main crossbeam, when the secondary crossbeam deforms under heavy load, it will not affect the deformation of the main crossbeam downwards, thereby maintaining the stability of the main crossbeam during operation and further avoiding the instability of the main crossbeam under stress deformation, thus improving the accuracy of the machine tool.

[0018] 3. This application employs a combination of a push plate and an oil push plate, so that when the push plate moves laterally, it pushes the oil push plate laterally. At this time, by adjusting the force of the spring, the oil outlet can allow the oil to enter the lubricating sponge and wet the lubricating sponge. During this process, the lubricating oil can be added quickly. After the addition is completed, by rotating the lubricating oil tank, the oil outlet can be moved from the lowest end to the side or the highest end, which can prevent oil leakage.

[0019] 4. This application utilizes a lubricating sponge to lubricate the secondary crossbeam guide rail. The lubricating sponge not only lubricates the secondary crossbeam guide rail but also catches any spilled oil, preventing excessive oil spillage during lubrication and thus ensuring a safe working environment for the mechanism.

[0020] 5. This application provides an oil receiving port at the bottom of the movable push plate to collect the oil discharged by extrusion, thus avoiding the oil pollution problem caused by the oil dripping directly onto the worktable. Furthermore, by connecting the oil receiving port to the input end of the discharge pipe, this application can collect the fallen oil while simultaneously achieving the recycling of the oil. Attached Figure Description

[0021] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram showing the position of the secondary crossbeam in this invention;

[0024] Figure 3 This is a schematic diagram showing the location of the lubrication assembly of the present invention;

[0025] Figure 4 This is a schematic diagram of the lubrication assembly structure of the present invention;

[0026] Figure 5 For the present invention Figure 4 A magnified view of a section at point A in the middle;

[0027] Figure 6 This is a schematic diagram of the connection component of the present invention;

[0028] Figure 7 For the present invention Figure 6 A magnified view of a section at point B in the middle;

[0029] Figure 8 This is a schematic diagram showing the location of the lubricating sponge according to the present invention;

[0030] Figure 9 This is a schematic diagram of the cooperation between the push plate and the oil push plate of the present invention.

[0031] In the diagram: 1. Left column; 2. Right column; 3. Main crossbeam; 4. Secondary crossbeam; 5. Saddle; 6. Main crossbeam guide rail; 7. Secondary crossbeam guide rail; 8. Main crossbeam slider; 9. Cylinder bracket; 10. Secondary crossbeam slider; 11. Balance cylinder; 12. Cylinder mounting plate; 13. Lubricating oil pipe; 14. Top frame; 15. Lubricating oil tank; 16. Adjusting shaft; 17. Oil baffle; 18. Oil outlet; 19. Oil push plate; 20. [Unclear text - possibly related to accessories] 21. Adjusting slide bar; 22. Adjusting slide groove; 23. Adjusting spring; 24. First support plate; 25. Receiving push plate; 26. Second support plate; 27. Connecting cylinder; 28. Connecting support plate; 29. ​​Matching push plate; 30. Oil leakage hole; 31. Oil leakage pipe; 32. Lubricating sponge; 33. Discharge pipe; 34. Oil receiving interface; 35. Spray outlet; 36. Moving push plate; 37. Connecting assembly; 38. Lubrication assembly. Detailed Implementation

[0032] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0033] Please see Figure 1-9As shown, a secondary crossbeam gravity balance structure applied to a gantry milling machine includes a left column 1 and a right column 2, which are respectively installed on both sides of the work platform. A main crossbeam 3 is fixedly installed above the left column 1 and the right column 2, and the two ends of the main crossbeam 3 are respectively fixedly connected to the two ends of the secondary crossbeam 4. The main crossbeam 3 is used to support and limit the movement of the working mechanism, while the secondary crossbeam 4 is equipped with a gravity balance mechanism to achieve gravity balance of the working mechanism and reduce the gravity load of the power.

[0034] Specifically, main crossbeam guide rails 6 are installed at the upper and lower ends of the main crossbeam 3. There are two sets of main crossbeam guide rails 6, and a main crossbeam slider 8 is slidably installed on the main crossbeam guide rails 6 to realize the sliding limit function of the working mechanism when it moves. The sliding saddle 5 is installed on the main crossbeam slider 8. When the main crossbeam slider 8 moves laterally along the main crossbeam guide rails 6, the sliding saddle 5 can move laterally relative to the main crossbeam 3, thereby realizing the lateral movement of the working mechanism.

[0035] Meanwhile, the gravity balancing mechanism includes a balancing cylinder 11, and secondary crossbeam guide rails 7 are installed at the upper and lower ends of the secondary crossbeam 4. A secondary crossbeam slider 10 is slidably mounted on the secondary crossbeam guide rail 7, and a cylinder mounting plate 12 is installed on the secondary crossbeam slider 10. A balancing cylinder 11 is installed on the cylinder mounting plate 12. The piston rod of the balancing cylinder 11 is connected to the cylinder bracket 9, and the cylinder bracket 9 is connected to the slide saddle 5. Air pressure is supplied through the balancing cylinder 11, so that the slide saddle 5 and the secondary crossbeam guide rail 7 are subjected to force. When the force provided by the two balancing cylinders 11 is equal to the weight of the slide saddle 5, the main crossbeam 3 is not deformed by the weight of the slide saddle 5, which can improve the accuracy and stability of the machine tool.

[0036] Therefore, in the above technical solution, the balancing cylinder 11 is used to balance the longitudinal force between the slide saddle 5 and the secondary crossbeam guide rail 7, thereby balancing the longitudinal force between the main crossbeam guide rail 6 and the slide saddle 5. When the working mechanism is started, that is, when the working mechanism moves laterally, the main crossbeam 3 is not subjected to longitudinal gravity, thus avoiding longitudinal deformation and improving the accuracy of the machine tool.

[0037] Furthermore, a lubrication assembly 38 is installed on the sub-beam 4, wherein the lubrication assembly 38 is used to lubricate the sub-beam guide rail 7. In this application, a connecting assembly 37 is provided between adjacent cylinder mounting plates 12.

[0038] Specifically, the connecting assembly 37 includes a first support plate 24 and a second support plate 26, wherein the first support plate 24 and the second support plate 26 are respectively fixedly installed on the cylinder mounting plate 12, and a connecting support plate 28 is fixed between the first support plate 24 and the second support plate 26, wherein a lubrication receiving assembly is provided in the middle of the connecting support plate 28, and the oil required by the lubrication receiving assembly is obtained from the position of the lubrication assembly 38.

[0039] Specifically, a connecting cylinder 27 is fixedly installed on the connecting support plate 28, and a receiving push plate 25 is fixed to the power end of the connecting cylinder 27. That is, the height of the receiving push plate 25 is controlled by the connecting cylinder 27, so that the receiving push plate 25 can be close to the position of the lubrication component 38, so that the oil can enter the interior of the lubrication receiving component from the receiving push plate 25.

[0040] In order to allow oil to enter the interior of the lubrication receiving assembly, the receiving push plate 25 is provided with an oil leakage hole 30, wherein the oil leakage hole 30 is connected to the interior of the lubrication receiving assembly through an oil leakage pipe 31. That is, the oil inside the lubrication assembly 38 falls onto the oil leakage hole 30 and then enters the interior of the lubrication receiving assembly through the oil leakage pipe 31.

[0041] Therefore, the lubrication assembly 38 includes a lubricating oil tank 15, that is, a top frame 14 is fixedly installed on the sub-beam 4, wherein the lubricating oil tank 15 is rotatably mounted on the top frame 14 via an adjusting shaft 16, wherein the adjusting shaft 16 is controlled by a motor, and the rotation of the adjusting shaft 16 is achieved by the motor, thereby achieving the height of the output end of the lubricating oil tank 15. That is, the lubricating oil tank 15 is respectively provided with a lubricating oil pipe 13 for allowing oil to enter the interior of the lubricating oil tank 15 and an oil outlet 18 for allowing oil to flow into the oil drain hole 30, wherein a control component for oil control is provided at the position of the oil outlet 18.

[0042] Specifically, the oil is first introduced into the lubricating oil tank 15 through the lubricating oil pipe 13. During use, the rotation of the lubricating oil tank 15 is controlled by the motor, so that the position of the oil outlet 18 is rotated to the side to avoid oil leakage caused by the oil outlet 18 being located at the bottom. At the same time, the control component is used to control the oil flow rate and flow rate.

[0043] The control assembly includes an oil baffle 17, an adjustment groove 22 on the side of the oil outlet 18, an adjustment rod 21 slidably disposed inside the adjustment groove 22, a limit plate on the adjustment rod 21, and the oil baffle 17 installed at the end of the adjustment rod 21. An adjustment spring 23 is fixed between the limit plate and the adjustment groove 22. An oil push plate 19 is fixed below the oil baffle 17, and a mating push plate 29 for cooperating with the oil push plate 19 is fixed on the receiving push plate 25.

[0044] When the receiving push plate 25 moves laterally, it pushes the oil push plate 19 to move laterally. At this time, it pushes the limit plate to move, so that the adjusting spring 23 is under pressure, thereby causing the oil baffle 17 to move out of the oil outlet 18, so that the oil can be discharged through the oil outlet 18 to the position of the oil leakage hole 30, thus realizing the discharge of oil.

[0045] The oil push plate 19 is Z-shaped, and a mating protrusion 20 is fixed on the lubricating oil tank 15 to cooperate with the oil push plate 19. The oil push plate 19 and the mating push plate 29 are used together to enable the lateral movement of the oil push plate 19. When the oil push plate 19 moves to the outermost position, the oil push plate 19 pushes onto the mating protrusion 20. At this time, the oil is initially guided by the oil push plate 19 and then guided again by the mating push plate 29 to the inside of the oil leakage hole 30.

[0046] The lubrication receiving component includes a movable push plate 36, which is installed at the output end of a movable cylinder. The movable push plate 36 can be controlled by the movable cylinder to move laterally, so that the movable push plate 36 is moved to the position of the secondary crossbeam guide rail 7 for lubrication. Therefore, in this application, the movable push plate 36 is U-shaped, and a lubricating sponge 32 is fixed inside the movable push plate 36, which is used to lubricate the secondary crossbeam guide rail 7.

[0047] In use, when the connecting support plate 28 moves laterally along with the first support plate 24 and the second support plate 26, it drives the connecting support plate 28 to move. At this time, the moving cylinder controls the moving push plate 36 to move towards the secondary crossbeam guide rail 7, so that the lubricating sponge 32 is close to the secondary crossbeam guide rail 7, and the secondary crossbeam guide rail 7 is lubricated when the connecting support plate 28 moves.

[0048] The movable push plate 36 has a rigid pipe running through it. The rigid pipe is connected to the oil leakage pipe 31 via a control valve. A spray outlet 35 is provided on the side of the rigid pipe. The spray outlet 35 is located inside the lubricating sponge 32 to spray oil onto the lubricating sponge 32. Since some oil is easily squeezed out when the lubricating sponge 32 is pressed against the secondary crossbeam guide rail 7, an oil receiving port 34 is provided at the lowest end of the movable push plate 36 to allow the oil to enter the oil receiving port 34 and then be discharged through the discharge pipe 33.

[0049] This application utilizes a lubricating sponge 32 to lubricate the secondary crossbeam guide rail 7. Because the lubricating sponge 32 has absorbency, it can prevent oil from falling directly onto the workbench and causing oil contamination. Some of the compressed oil is collected through the oil receiving port 34 and then discharged from the discharge pipe 33. The discharged oil is filtered and can be recycled.

[0050] In use, the present invention uses the balancing cylinder 11 to balance the forces between the slide saddle 5 and the secondary crossbeam guide rail 7, thereby balancing the longitudinal forces between the main crossbeam guide rail 6 and the slide saddle 5. When the working mechanism is started, that is, when the working mechanism moves laterally, the main crossbeam 3 is not subjected to longitudinal gravity, thus avoiding longitudinal deformation and improving the accuracy of the machine tool. In order to ensure the lubrication of the secondary crossbeam guide rail 7 and avoid problems such as jamming damage caused by the secondary crossbeam guide rail 7 under long-term use, this application uses the lubrication component 38 to start at regular intervals to achieve lubrication of the secondary crossbeam guide rail 7.

[0051] Specifically, firstly, by adjusting the rotation of the shaft 16, the oil outlet 18 is rotated to its lowest point. Then, when the connecting assembly 37 moves to its sidemost position, the connecting cylinder 27 is activated to control the height of the receiving push plate 25, so that the receiving push plate 25 and the outlet height of the oil outlet 18 are matched. As the receiving push plate 25 moves, the cooperating push plate 29 and the oil push plate 19 cooperate, pushing the cooperating push plate 29 to move laterally, thereby causing the oil baffle 17 to move laterally. At this time, the adjusting slide rod 21 slides inside the adjusting slide groove 22, and the adjusting spring 23 is subjected to compressive force, causing the oil baffle 17 to move from the oil outlet 18. The oil is moved out of position 8. At this time, the oil enters the oil leakage pipe 31 through the oil leakage hole 30. The oil is sprayed out onto the lubricating sponge 32 through the spray outlet 35 to wet the lubricating sponge 32. Then, the position of the moving push plate 36 is controlled by the moving cylinder to move the lubricating sponge 32 to the position of the secondary crossbeam guide rail 7 to lubricate the secondary crossbeam guide rail 7. At this time, the oil outlet 18 returns to its original position due to the reverse movement of the connecting support plate 28 and the rotation of the lubricating oil tank 15. At this time, the secondary crossbeam guide rail 7 can be fully lubricated by the reciprocating lateral movement of the connecting support plate 28.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A gravity counterbalance structure for a cross beam of a gantry machine tool, comprising a main cross beam (3) provided with a working mechanism by a power device, characterized in that: The main crossbeam (3) is provided with a sub crossbeam (4), the gravity balance mechanism is slidably arranged on the sub crossbeam (4), and the end of the sub crossbeam (4) is provided with a lubricating assembly (38) for lubricating the sliding of the gravity balance mechanism; The gravity balance mechanism comprises a balance cylinder (11), the balance cylinder (11) is fixedly installed on a cylinder mounting plate (12), the cylinder mounting plate (12) and the sub crossbeam guide rail (7) are slidably connected, and the sub crossbeam guide rail (7) is fixedly installed on the sub crossbeam (4); The sub crossbeam (4) is fixed with a sub crossbeam guide rail (7) for transverse sliding of the gravity balance mechanism, the connecting cylinder (27) is slidably arranged on the sub crossbeam guide rail (7), and the output end of the connecting cylinder (27) is used for guiding the outlet of oil liquid in the lubricating assembly (38) to the receiving push plate (25); The receiving push plate (25) is provided with an oil leakage hole (30), and the oil leakage hole (30) is used for wetting the lubricating sponge (32) through the oil leakage pipeline (31); The lubricating assembly (38) comprises a lubricating oil tank (15), the lubricating oil tank (15) is rotatably installed on the top frame (14) by a power device, the top frame (14) is fixedly installed on the sub crossbeam (4), the lubricating oil tank (15) is provided with an oil outlet (18), and the oil outlet (18) is controlled by a control assembly; The control assembly comprises an oil baffle (17), the oil baffle (17) is slidably arranged on the oil outlet (18), the oil baffle (17) is fixedly provided with an adjusting slide rod (21) on the side, the adjusting slide rod (21) is fixedly provided with an adjusting spring (23) for providing the rebound of the adjusting slide rod (21), the oil baffle (17) is fixedly provided with an oil push plate (19) at the bottom, and the receiving push plate (25) is fixedly provided with a matching push plate (29) for cooperating with the oil push plate (19).

2. The gravity balance structure of the cross beam applied to the gantry machine tool according to claim 1, characterized in that, The connecting cylinder (27) is fixedly installed on the connecting support plate (28), the connecting support plate (28) is fixedly provided with a moving push plate (36) on the side through a moving cylinder, the moving push plate (36) is in the shape of "U", and the lubricating sponge (32) is fixedly installed in the moving push plate (36).

3. The gravity counterbalance structure for the cross beam of a gantry machine tool according to claim 2, characterized in that, The bottom of the moving push plate (36) is provided with an oil receiving port (34), the oil receiving port (34) is connected to the input end of the discharge pipe (33), and the moving push plate (36) is fixedly provided with a spray outlet (35) for wetting the lubricating sponge (32) in the inside, and the spray outlet (35) is connected to the oil leakage pipeline (31).

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