Ram high-speed balance structure of heavy-load gantry machine tool

Abstract

The utility model relates to a heavy-load gantry machine tool ram high-speed balance structure which comprises a sliding plate and a ram, the sliding plate surrounds the outer side of the ram, the ram is driven by a motor speed reducing unit arranged above the sliding plate to slide up and down in the ram, four linear rails are installed on the surface of the ram, and the linear rails are arranged on the sliding plate. The utility model relates to the technical field of gantry machine tool rams. According to the ram high-speed balance structure of the heavy-duty gantry machine tool, the working speed and the fast moving speed of a Z shaft of the heavy-duty gantry machine tool are greatly increased, and the machining efficiency of the machine tool is improved; four linear rails are arranged to surround the ram, so that the stability of Z-axis operation is ensured; the nitrogen balance cylinder works independently, no external power equipment is needed, noise is avoided, installation is easy, use is convenient, and maintenance can be avoided when the nitrogen balance cylinder is used properly; a nitrogen cylinder is selected, precision and smoothness can be greatly improved in the machining process, micro-vibration is avoided, the service life of the lead screw and the motor is prolonged, and high-speed dynamic balance optimization is achieved.

Description

Technical Field

[0001] This utility model relates to the field of gantry milling machine slide technology, specifically a high-speed balancing structure for heavy-duty gantry milling machine slide. Background Technology

[0002] Currently, heavy-duty gantry crane products have relatively heavy rams, with a typical working speed of 5m / min and a rapid traverse speed of 10m / min. They employ screw drives and single or double hydraulic cylinder balancing to balance approximately 80% of the weight of the Z-axis moving parts.

[0003] As heavy-duty machine tools develop towards higher speeds and greater precision, the dynamic balance and lubrication of the ram system have become key bottlenecks restricting performance. Traditional gantry machine tool rams mostly employ hydraulic cylinder balancing systems, but under high-speed motion (≥40m / min), these hydraulic systems exhibit the following drawbacks:

[0004] Shock and vibration: Due to the incompressibility of the liquid, the hydraulic cylinder experiences a sudden pressure change during start-up and shutdown, which triggers the "water hammer effect" in the pipeline, exacerbating mechanical vibration and affecting machining accuracy;

[0005] Complex maintenance: Hydraulic systems require oil pumps, valve groups, and cooling devices, resulting in high maintenance costs and the risk of leakage.

[0006] Insufficient lubrication: Traditional grease lubrication or timed oil injection methods are prone to oil film breakage under high-speed conditions, resulting in dry friction between the linear guide and the slider contact surface, accelerating wear and generating micro-vibration, and reducing the life of the lead screw. Utility Model Content

[0007] To address the shortcomings of existing technologies, this invention provides a high-speed balancing structure for the slide of a heavy-duty gantry milling machine, thus solving the aforementioned problems.

[0008] To achieve the above objectives, this utility model is implemented through the following technical solution: a high-speed balancing structure for a heavy-duty gantry milling machine ram, comprising a sliding plate and a ram, wherein the sliding plate surrounds the outside of the ram, and the ram is driven to slide up and down within the ram by a motor reducer set above the sliding plate, wherein four linear rails are installed on the surface of the ram, and a slider that is slidably connected to the linear rails is provided in the inner cavity of the sliding plate.

[0009] It also includes two nitrogen cylinders symmetrically arranged on both sides of the slide block, and the two nitrogen cylinders are mounted on both sides of the slide block through two nitrogen cylinder seats;

[0010] It also includes an oil replenishment mechanism mounted on the slide plate. The oil replenishment mechanism comprises an oil supply tank fixed to the slide plate and an oil return hopper fixed directly below the linear guide rail on the slide block. The inner cavity of the slide block has an inner groove, and the inner cavity of the inner groove is rotatably connected to a roller that is rollingly connected to the side of the linear guide rail via a connecting shaft. One side of the oil supply tank is connected to an oil outlet pipe. One end of the oil outlet pipe penetrates and extends into the inner cavity of the inner groove, and the end of the oil outlet pipe is connected to a drip pipe facing the joint between the linear guide rail and the slide block. One end of the connecting shaft penetrates and extends into the inner cavity of the oil outlet pipe, and four pairs of... The system features four semi-circular push plates that rotate and seal with the inner cavity of the oil outlet pipe. During operation, when the ram moves, it drives the linear guide to move within the slider. This movement causes friction with the rollers, which in turn rotate the connecting shaft, causing the push plates to rotate within the oil outlet pipe. This pushes the high-viscosity oil inside along the drip pipe, replenishing the linear guide with oil. Traditional grease lubrication is prone to oil film breakage at high speeds of 40 m / min, leading to localized dry friction on the linear guide. Excessive oil replenishment can contaminate the machining area and affect the cleanliness of the machine tool. This system achieves "on-demand oil supply," saving 40% more oil than traditional timed lubrication.

[0011] As a further embodiment of this utility model: the four rails are distributed on the left and right sides of the slide block, one on each side and two on the rear side. The left and right sides are the main guide rails, each with three sliders, and the two rear sides are the auxiliary guide rails, each with two sliders.

[0012] As a further embodiment of this utility model: the two nitrogen cylinders are placed on the left and right sides of the slide block, with their center lines coinciding with the center line of the slide block.

[0013] As a further embodiment of this utility model: the oil return hopper is connected to the oil supply tank through the oil return pipe, and the oil return pipe passes through a magnetic filter, supplies new oil to the oil supply tank through the main oil circuit, and the auxiliary oil circuit recovers waste oil through the oil return hopper. After centrifugal separation, it is mixed with fresh lubricating oil at a ratio of 1:4 for reuse, reducing waste oil discharge by 90%.

[0014] As a further embodiment of this utility model, four oil replenishment mechanisms are provided, which are respectively arranged above and below the four linear rails.

[0015] The slide plate surrounds the ram, which is equipped with four linear guides. Ten sliders move up and down within the slide plate. The left and right sides are the main guide rails, each with three sliders, while the two rear guide rails are auxiliary guide rails, each with two sliders. The transmission mechanism, including the motor and reducer, is located at the rear of the ram. This arrangement and the four linear guides ensure the stability of the ram's operation. The ram and its moving parts weigh approximately 5 tons and operate at a speed of 40 m / min, with a rapid traverse speed of 45 m / min. Such high-speed movement would place a significant impact on the hydraulic cylinders and pipelines if traditional hydraulic cylinder balancing were used. Therefore, nitrogen cylinders are chosen for balancing. Simply fill the nitrogen cylinders with nitrogen and install them; no external piping is required. The nitrogen cylinders are placed on the left and right sides of the slide, with their centers aligned with the center of the slide. The two nitrogen cylinder seats are installed on both sides of the slide using eight M16 bolts, and positioning keys ensure that the cylinder seats do not move. The two nitrogen cylinders are connected to the cylinder seats using twelve M10 bolts. Floating support plates are installed at the bottom of the nitrogen cylinders to ensure that the nitrogen cylinders have a slight adjustment angle. This structure ensures the high-speed operation of the slide while also taking into account stability and safety.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] It greatly improves the working speed and rapid traverse speed of the Z-axis of heavy-duty gantry milling machines, thereby increasing the machining efficiency; it is equipped with four linear guides that surround the ram to ensure the stability of the Z-axis operation; the nitrogen balance cylinder works independently, requiring no external power equipment, producing no noise, and is simple to install and easy to use, requiring no maintenance if used properly; the use of nitrogen cylinders can significantly improve accuracy and surface finish during machining, eliminating micro-vibration and extending the service life of the lead screw and motor; high-speed dynamic balance optimization.

[0018] The centerline of the symmetrically arranged nitrogen cylinders coincides with the center of gravity of the slide block, and the inertial impact of the 5-ton slide block is offset by the gas spring effect, reducing the vibration amplitude by 60% compared with the traditional hydraulic system.

[0019] The “4-rail + 10-slider” layout provides redundant support, increasing the anti-overturning moment to 2.3 times that of the traditional double-rail structure.

[0020] Intelligent on-demand lubrication

[0021] Friction-oil supply linkage mechanism: The roller rotates with the linear guide, and drives the push plate to squeeze high-viscosity oil through the connecting shaft, realizing "oil supply as movement". The lubrication flow rate is positively correlated with the speed, saving 40% of oil compared with timed lubrication;

[0022] Precise dripping prevents contamination: The dripping pipeline sprays oil directionally to the joint between the linear guide and the slider. Combined with the return oil bucket and magnetic filter, waste oil is recovered, reducing oil splashing by 90% and waste oil discharge to 10% of that of traditional systems.

[0023] Synergistic improvement of thermo-mechanical performance

[0024] Rolling friction between the roller and the linear guide replaces sliding friction, reducing the temperature rise at the contact surface from 15°C to 8°C.

[0025] The auxiliary oil circuit centrifugal separation system mixes the recovered oil with fresh oil at a ratio of 1:4 for reuse, avoiding viscosity decay caused by oil oxidation and extending the oil change cycle. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 This is a top view of the structure of this utility model;

[0028] Figure 3 This is a schematic diagram of the oil replenishment mechanism of this utility model;

[0029] Figure 4 This utility model Figure 3 A magnified view of a portion of point A in the middle.

[0030] In the diagram: 1. Slide plate; 2. Slide block; 3. Nitrogen cylinder; 4. Linear rail; 5. Slider; 6. Oil supply tank; 7. Oil outlet pipe; 8. Roller; 9. Connecting shaft; 10. Push plate; 11. Oil dripping pipe; 12. Oil return bucket. Detailed Implementation

[0031] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0032] Please see Figure 1-4 This utility model provides a technical solution: a high-speed balancing structure for a heavy-duty gantry milling machine slide ram, including a slide plate 1 and a slide ram 2. The slide plate 1 surrounds the outside of the slide ram 2. The slide ram 2 is driven to slide up and down inside the slide ram 2 by a motor reducer set above the slide plate 1. Four linear rails 4 are installed on the surface of the slide ram 2. The inner cavity of the slide plate 1 is provided with a slider 5 that is slidably connected to the linear rails 4.

[0033] It also includes two nitrogen cylinders 3 symmetrically arranged on both sides of the slide block 2, and the two nitrogen cylinders 3 are installed on both sides of the slide block 2 through two nitrogen cylinder seats;

[0034] It also includes an oil replenishment mechanism installed on the slide plate 1. The oil replenishment mechanism includes an oil supply tank 6 fixed on the slide plate 1 and an oil return hopper 12 fixed directly below the linear guide 4 on the slide block 2. The inner cavity of the slider 5 has an inner groove. The inner cavity of the inner groove is rotatably connected to a roller 8 that is rolled and connected to the side of the linear guide 4 via a connecting shaft 9. One side of the oil supply tank 6 is connected to an oil outlet pipe 7. One end of the oil outlet pipe 7 passes through and extends into the inner cavity of the inner groove. The end of the oil outlet pipe 7 is connected to an oil drip pipe 11 that faces the joint between the linear guide 4 and the slider 5. One end of the connecting shaft 9 passes through and extends into the inner cavity of the oil outlet pipe 7. Four symmetrically arranged... The four push plates 10 are semi-circular plates that rotate and seal with the inner cavity of the oil outlet pipe 7. When the slide ram 2 moves, it drives the linear guide 4 to move within the slider 5. During the movement, it rubs against the roller 8, causing the roller 8 to rotate. The rotation of the roller 8 drives the connecting shaft 9 to rotate, which in turn drives the push plates 10 to rotate within the oil outlet pipe 7. This pushes the high-viscosity oil inside through the drip pipe 11 to replenish the oil in the linear guide 4. Traditional grease lubrication is prone to oil film breakage at high speeds of 40 m / min, resulting in local dry friction of the linear guide. Excessive oil replenishment can easily contaminate the processing area and affect the cleanliness of the machine tool. "On-demand oil supply" saves 40% more oil than traditional timed lubrication.

[0035] Four guide rails 4 are distributed on the left and right sides of the slide block 2, and two on the rear side. The left and right sides are the main guide rails, each with three sliders 5, and the two rear sides are auxiliary guide rails, each with two sliders 5.

[0036] Two nitrogen cylinders 31 are placed on the left and right sides of the slide block 2, with their center lines coinciding with the center line of the slide block 2.

[0037] The return oil hopper 12 is connected to the oil supply tank 6 through the return oil pipeline, and the return oil pipeline passes through a magnetic filter. It supplies new oil to the oil supply tank 6 through the main oil circuit. The auxiliary oil circuit recovers waste oil through the return oil hopper 12. After centrifugal separation, it is mixed with fresh lubricating oil at a ratio of 1:4 for reuse, reducing waste oil discharge by 90%.

[0038] There are four oil replenishment mechanisms, which are set above and below the four linear guides 4 respectively.

[0039] The slide plate 1 encircles the slide ram 2, on which four linear guides 4 are installed. Ten sliders move up and down within the slide plate 1. The left and right sides are the main guide rails, each with three sliders 5, and the two rear sides are auxiliary guide rails, each with two sliders 5. The transmission mechanism, including the motor and reducer, is located behind the slide ram 2. This arrangement and the four linear guide layout ensure the stability of the slide ram 2 during operation. The slide ram 2 and its moving parts weigh approximately 5 tons and operate at a speed of 40 m / min, with a rapid traverse speed of 45 m / min. Such high-speed movement would place a significant impact on the hydraulic cylinders and pipelines if traditional hydraulic cylinder balancing were used. Therefore, nitrogen cylinder 3 is chosen for balancing. It only needs to be filled with nitrogen before installation, without the need for external piping. Nitrogen cylinder 3 is placed on the left and right sides of ram 2, with its center aligned with the center of ram 2. The two nitrogen cylinder seats are installed on both sides of ram 2 using eight M16 grade 12.9 bolts, and positioning keys ensure that the cylinder seats will not move. The two nitrogen cylinders 3 are connected to the cylinder seats by twelve M10 bolts. A floating support plate is installed at the bottom of nitrogen cylinder 3 to ensure that nitrogen cylinder 3 has a slight adjustment angle. The above structure ensures the high-speed operation of ram 2, while also taking into account stability and safety.

[0040] The centerline of the symmetrically arranged nitrogen cylinder 3 coincides with the center of gravity of the slide ram 2. The inertial impact of the 5-ton slide ram is offset by the gas spring effect, which reduces the vibration amplitude by 60% compared with the traditional hydraulic system.

[0041] The "4-rail + 10-slider" layout has 3 sliders on each side and 2 sliders on each side at the rear, forming redundant support and increasing the anti-overturning moment to 2.3 times that of the traditional double-rail structure.

[0042] Intelligent on-demand lubrication

[0043] Friction-oil supply linkage mechanism: Roller 8 rotates with the linear guide 4, and drives push plate 10 to squeeze high viscosity oil through connecting shaft 9, realizing "oil supply as movement". The lubrication flow rate is positively correlated with the speed, saving 40% of oil compared with timed lubrication;

[0044] Precise dripping prevents contamination: The dripping pipe 11 sprays oil directionally to the joint between the linear guide and the slider, and works with the return oil bucket 12 and the magnetic filter to recover waste oil, reducing oil splashing by 90% and reducing waste oil discharge to 10% of the traditional system.

[0045] Synergistic improvement of thermo-mechanical performance

[0046] Roller 8 and linear guide 4 use rolling friction instead of sliding friction, and the temperature rise of the contact surface is reduced from 15℃ to 8℃.

[0047] The auxiliary oil circuit centrifugal separation system mixes the recovered oil with fresh oil at a ratio of 1:4 for reuse, avoiding viscosity decay caused by oil oxidation and extending the oil change cycle.

[0048] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. 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 utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A high-speed balancing structure for a heavy-duty gantry milling machine ram, comprising a slide plate (1) and a ram (2), wherein the slide plate (1) surrounds the outside of the ram (2), and the ram (2) is driven to slide up and down within the ram (2) by a motor reducer unit disposed above the slide plate (1), characterized in that: The surface of the slide block (2) is equipped with four linear rails (4), and the inner cavity of the slide plate (1) is provided with a slider (5) that is slidably connected to the linear rails (4); It also includes two nitrogen cylinders (3) symmetrically arranged on both sides of the slide (2), and the two nitrogen cylinders (3) are mounted on both sides of the slide (2) through two nitrogen cylinder seats; It also includes an oil replenishment mechanism set on the slide plate (1). The oil replenishment mechanism includes an oil supply tank (6) fixed on the slide plate (1) and an oil return hopper (12) fixed directly below the linear guide (4) on the slide block (2). The inner cavity of the slider (5) is provided with an inner groove. The inner cavity of the inner groove is rotatably connected to a roller (8) that is rolled and connected to the side of the linear guide (4) through a connecting shaft (9). One side of the oil supply tank (6) is connected to an oil outlet pipe (7). One end of the oil outlet pipe (7) passes through and extends into the inner cavity of the inner groove. The end of the oil outlet pipe (7) is connected to a drip pipe (11) facing the joint between the linear guide (4) and the slider (5). One end of the connecting shaft (9) passes through and extends into the inner cavity of the oil outlet pipe (7). Four symmetrically arranged push plates (10) are fixedly connected to the surface of the inner cavity of the oil outlet pipe (7) on the connecting shaft (9). The four push plates (10) are semi-circular plates that rotate and seal with the inner cavity of the oil outlet pipe (7).

2. The high-speed balancing structure for a heavy-duty gantry milling machine ram according to claim 1, characterized in that: The four guide rails (4) are distributed on the left and right sides of the slide block (2) and on the rear side, one on each side and two on the rear side. The left and right sides are the main guide rails, each with three sliders (5), and the two on the rear side are the auxiliary guide rails, each with two sliders (5).

3. The high-speed balancing structure for a heavy-duty gantry milling machine ram according to claim 1, characterized in that: The two nitrogen cylinders (3) are placed on the left and right sides of the slide (2), with their center lines coinciding with the center line of the slide (2).

4. The high-speed balancing structure for a heavy-duty gantry milling machine ram according to claim 1, characterized in that: The return oil hopper (12) is connected to the oil supply tank (6) through the return oil pipeline. The return oil pipeline passes through a magnetic filter and supplies new oil to the oil supply tank (6) through the main oil circuit. The auxiliary oil circuit recovers waste oil through the return oil hopper (12). After centrifugal separation, it is mixed with fresh lubricating oil at a ratio of 1:4 for reuse, reducing waste oil discharge by 90%.

5. The high-speed balancing structure for a heavy-duty gantry milling machine ram according to claim 1, characterized in that: There are four oil replenishment mechanisms, which are set above and below the four linear rails (4).

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