A portal type machining machine

Abstract

The application relates to the technical field of machine tool machining, and discloses a crown-type gantry machining machine tool, which comprises a gantry machine tool body, a cross beam slidably installed on the top of the gantry machine tool body, a sliding seat slidably installed on one side of the cross beam, a sliding ram slidably installed in the sliding seat, and two sliding blocks symmetrically and fixedly installed on the outer side of the sliding ram. The flow of lubricating oil flowing back to the oil tank through the throttle valve and the pipeline is monitored through the flow meter, so that the abnormal working condition is fed back through the lubrication state of the lubricating oil between the sliding blocks and the sliding rails, and the acceleration sensor is triggered to realize real-time monitoring on the running speed of the sliding ram and the sliding blocks, so that when the abnormal working condition occurs, the acceleration sensor is in a non-detection state, the abnormal working condition cannot be timely perceived and reported, the machining precision loss caused by the sudden abnormality is avoided, the stability and consistency of the machining precision are ensured, and the overall machining efficiency and equipment reliability are improved.

Description

Technical Field

[0001] This application relates to the field of machine tool processing technology, and in particular to a crane-type gantry machining center. Background Technology

[0002] A gantry machining center is a CNC machine tool with its spindle Z-axis perpendicular to the worktable. It adopts a portal frame structure consisting of double columns and a top beam, which has high rigidity and is suitable for machining large and complex workpieces in aerospace, shipbuilding and other fields. According to the motion mode, it is divided into fixed beam type, moving beam type, moving column type and overhead crane type.

[0003] The characteristic of overhead gantry machining centers is that the crossbeam can only move horizontally along the X-axis and cannot move vertically along the Z-axis. Therefore, when it is necessary to process the workpiece according to the height change of the workpiece, the machining parts can only be moved up and down by the slide. Since the slide and machining parts are mounted on the side relative to the slide, the force between the slide and the slide is uneven over a long period of time. The guide rail that limits the movement of the slide is prone to wear and deformation and other abnormal conditions due to long-term operation.

[0004] In response to this, existing technologies for periodic inspection and maintenance of machine tools employ two detection methods for abnormal guideways: one is offline precision inspection, which requires machine shutdown to meet inspection conditions, and the other is online status monitoring, which does not require machine shutdown. In the latter, to ensure the lifespan of the accelerometer and avoid unnecessary wear or scratches on the guideway surface caused by prolonged continuous contact, a periodic inspection scheme is typically used. Therefore, when abnormalities begin to appear in the guideway due to wear, changes in preload, or foreign objects, the accelerometer may be out of service and unable to immediately capture the initial fault signal. This results in the abnormal condition not being detected and reported in a timely manner, gradually developing to the point of affecting machining accuracy and ultimately impacting machining efficiency. Summary of the Invention

[0005] This application proposes a crane-type gantry machining tool, which monitors the flow rate of lubricating oil returning to the oil tank via a flow meter through a throttle valve and pipeline. Abnormal working conditions are fed back based on the lubrication status of the lubricating oil between the slide block and the slide rail. An accelerometer is triggered to monitor the travel speed of the slide block and ram in real time. This prevents abnormal working conditions from going undetected and unreported when the accelerometer is not in a detection state, thus avoiding loss of machining accuracy due to undetected sudden anomalies. It ensures the stability and consistency of machining accuracy, improves overall machining efficiency and equipment reliability, and solves the problem that when the accelerometer is periodically monitored for the ram's travel status, it cannot promptly detect and report abnormal working conditions when the accelerometer is not in a detection state, thus affecting machining accuracy and efficiency.

[0006] To achieve the above objectives, this application adopts the following technical solution: a gantry milling machine tool, comprising a gantry machine tool body, and a crossbeam slidably mounted on the top of the gantry machine tool body. A slide block is slidably mounted on one side of the crossbeam, and a slide ram is slidably mounted inside the slide block. Two sliders are symmetrically fixedly mounted on the outer side of the slide ram, and two slide rails are symmetrically fixedly mounted on the opposite inner side of the slide block. Each slider is slidably connected to its corresponding slide rail for limiting. An adjusting plate is rotatably mounted on the top of the slide rail, and an acceleration sensor is fixedly mounted on the adjusting plate near the slider. A progressive distributor is fixedly installed on the top of the slide rail. The oil outlet of the progressive distributor is fixedly connected to an oil injection pipe. The oil outlet of the progressive distributor is also fixedly connected to a throttle valve. The end of the throttle valve away from the progressive distributor is fixedly connected to the oil tank through a pipe. A flow meter is fixedly installed inside the pipe. The acceleration sensor and the flow meter are both connected to the PLC control system signal. The signal connection is used to monitor abnormal working conditions between the slider and the slide rail in real time and trigger the acceleration sensor in the non-operating state to monitor the travel speed of the ram and the slider in a timely manner.

[0007] During the lubrication process of the slider and slide rail mating surfaces via the oil injection pipe, the flow rate of lubricating oil returning to the oil tank through the throttle valve and pipeline is monitored in real time by a flow meter. This allows for feedback on abnormal working conditions based on the lubrication status of the lubricating oil between the slider and slide rail, and triggers an acceleration sensor to monitor the travel speed of the ram and slider in real time. This prevents abnormal working conditions from going undetected and unreported when the acceleration sensor is not in a detection state, thus avoiding loss of machining accuracy due to undetected sudden anomalies, ensuring the stability and consistency of machining accuracy, and improving overall machining efficiency and equipment reliability.

[0008] Furthermore, a rotating shaft is fixedly installed on the top of the slide rail, and the top of the rotating shaft is rotatably connected to the adjusting plate to support the adjusting plate.

[0009] Furthermore, a torsion spring is fitted on the outer side of the rotating shaft. The bottom end of the torsion spring is fixedly connected to the slide rail, and the top end of the torsion spring is fixedly connected to the adjusting plate. Under the action of the torsion spring's elastic force, the acceleration sensor remains away from the slider.

[0010] Furthermore, an mounting plate is fixedly installed on the inner side wall of the slide block. The mounting plate and the acceleration sensor are located on the same side of the adjustment plate. An electromagnet is fixedly installed on the side of the mounting plate near the adjustment plate, and the electromagnet is electrically connected to the PLC control system. The end of the adjustment plate near the electromagnet is made of ferromagnetic material.

[0011] Furthermore, the oil outlets of the progressive distributor are all fixedly connected to oil supply pipes, and the ends of the oil supply pipes away from the progressive distributor are all fixedly connected to a T-pipe. One end of the T-pipe away from the oil supply pipe is fixedly connected to the oil injection pipe.

[0012] Furthermore, the other end of the three-way pipe away from the oil supply pipe is fixedly connected to the throttle valve to allow excess lubricating oil to flow through the flow space.

[0013] Furthermore, a support shaft is fixedly installed at the bottom of the end of the adjustment plate away from the rotating shaft, and a slide groove adapted to the support shaft is opened on the top of the slide rail. The adjustment plate is supported by the support shaft to assist in the installation stability of the acceleration sensor.

[0014] Furthermore, the end of the support shaft near the slide groove is arc-shaped to reduce the friction when the support shaft slides inside the slide groove.

[0015] The beneficial effects of this invention are as follows:

[0016] This application provides a crane-type gantry machining tool. During the normal operation of the machining equipment driven by the ram, the flow rate of lubricating oil returning to the oil tank through the throttle valve and pipeline is monitored by a flow meter. The lubrication status of the lubricating oil between the slider and the slide rail is used to provide feedback on abnormal working conditions, and triggers an acceleration sensor to monitor the travel speed of the ram and slider in real time. This is to prevent the abnormal working conditions from being undetected and unreported when the acceleration sensor is not in a detection state, thus avoiding the loss of machining accuracy due to the failure to detect sudden abnormalities in time, ensuring the stability and consistency of machining accuracy, and improving the overall machining efficiency and equipment reliability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort:

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the front cross-sectional structure of the slide of the present invention;

[0020] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0021] Figure 4 This is a schematic diagram of the structure of the slide block, slide rail and adjusting plate of the present invention;

[0022] Figure 5 This is a schematic diagram of the slide rail, acceleration sensor, and oil injection pipe of the present invention.

[0023] In the diagram: 1. Gantry machine body; 2. Crossbeam; 3. Slide; 4. Roller; 5. Slider; 6. Slide rail; 7. Adjusting plate; 8. Acceleration sensor; 9. Progressive distributor; 10. Oil injection pipe; 11. Oil delivery pipe; 12. T-connector; 13. Throttle valve; 14. Rotary shaft; 15. Torsion spring; 16. Mounting plate; 17. Electromagnet; 18. Support shaft; 19. Slide groove. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] See Figures 1 to 5A gantry milling machine tool includes a gantry machine tool body 1 and a crossbeam 2 slidably mounted on the top of the gantry machine tool body 1. A slide block 3 is slidably mounted on one side of the crossbeam 2, and a slide block 4 is slidably mounted inside the slide block 3. Two sliders 5 are symmetrically fixedly mounted on the outer side of the slide block 4, and two slide rails 6 are symmetrically fixedly mounted on the opposite inner side of the slide block 3. Each slider 5 is slidably connected to the corresponding slide rail 6 for limiting. A processing device for processing workpieces is fixedly mounted on the bottom of the slide block 4. When processing the workpiece, the workpiece is placed on the worktable of the gantry machine tool body 1. In the horizontal direction, the crossbeam 2 is controlled by a drive source to move the slide block 3 and the slide block 4 according to the position of the workpiece. In the vertical direction, the slide block 4 is controlled by a drive source to move the processing device up and down. When the slide block 4 moves up and down, the sliders 5 and the slide rails 6 are in a relative sliding state.

[0026] A rotating shaft 14 is fixedly mounted on the top of the slide rail 6. An adjusting plate 7 is rotatably mounted on the top of the rotating shaft 14. A torsion spring 15 is fitted on the outer side of the rotating shaft 14. The bottom end of the torsion spring 15 is fixedly connected to the slide rail 6, and the top end of the torsion spring 15 is fixedly connected to the adjusting plate 7. An acceleration sensor 8 is fixedly mounted on the outer side of the adjusting plate 7 away from the rotating shaft 14. The acceleration sensor 8 is a sensor that can measure acceleration. The acceleration sensor 8 is placed on the side of the adjusting plate 7 closer to the slider 5. Under the action of the elastic force of the torsion spring 15, the adjusting plate 7 drives the acceleration sensor 8 to rotate around the rotating shaft 14 as the axis. The adjustment plate 7 moves away from the slider 5, and a support shaft 18 is fixedly installed at the bottom of the end of the adjustment plate 7 away from the rotating shaft 14. The top of the slide rail 6 has a groove 19 that matches the support shaft 18. The adjustment plate 7 is supported by the support shaft 18 to assist in the installation stability of the acceleration sensor 8. When the adjustment plate 7 drives the acceleration sensor 8 to rotate around the rotating shaft 14, the bottom of the support shaft 18 also slides inside the groove 19. The end of the support shaft 18 near the groove 19 is arc-shaped to reduce the friction when the support shaft 18 slides inside the groove 19.

[0027] A mounting plate 16 is fixedly installed on the inner wall of the slide block 3. The mounting plate 16 and the acceleration sensor 8 are located on the same side of the adjusting plate 7. An electromagnet 17 is fixedly installed on the side of the mounting plate 16 near the adjusting plate 7, and the electromagnet 17 is electrically connected to the PLC control system. The end of the adjusting plate 7 near the electromagnet 17 is made of ferromagnetic material. When the electromagnet 17 is energized, it will generate a repulsive force on the end of the adjusting plate 7 near the electromagnet 17. At this time, the end of the adjusting plate 7 away from the acceleration sensor 8 is subjected to force, and the repulsive force generated by the electromagnet 17 on the end of the adjusting plate 7 near the electromagnet 17 is greater than the elastic force of the rotating shaft 14, so that the adjusting plate 7 and the acceleration sensor 8 rotate about the rotating shaft 14 as the axis towards the slider 5 until the detection end of the acceleration sensor 8 is in contact with the slider 5. Then, during the up and down movement of the slider 5, the moving speed of the slider 5 is monitored by the acceleration sensor 8. When abnormalities occur between slide rail 5 and slide rail 6 due to wear, local pitting, or overturning torque generated by slide rail 4 and processing equipment, the moving speed of slide rail 4 and slide block 5 will fluctuate, and their acceleration will also fluctuate. Acceleration sensor 8 monitors these abnormal fluctuations and transmits the monitoring data to the PLC control system. The PLC control system processes and analyzes the data and sends an alarm to the staff for abnormal signals. After a single test is completed, electromagnet 17 is no longer energized, so that the repulsive force between electromagnet 17 and adjustment plate 7 disappears. Under the action of the elastic force of rotating shaft 14, adjustment plate 7 and acceleration sensor 8 rotate in the opposite direction around rotating shaft 14 to reset, so that the detection end of acceleration sensor 8 is no longer in contact with slide block 5, to prevent acceleration sensor 8 from being damaged due to continuous contact with slide block 5, which would affect the service life and detection accuracy of acceleration sensor 8.

[0028] The vibration between slider 5 and slide rail 6 includes multiple "modes," such as overall translational vibration along the moving direction of slide ram 4 and torsional vibration in the horizontal direction. When the vibration between slider 5 and slide rail 6 is caused by the impact of slide ram 4 changing direction in the vertical direction or by the overall resonance of the machine tool, the abnormal vibration waveforms detected by the two acceleration sensors 8 are in phase. If this type of abnormal condition occurs at a low frequency and is not continuous, it is a normal phenomenon during the operation of the gantry machine tool body 1 and does not require immediate shutdown for maintenance. When the vibration between slider 5 and slide rail 6 is caused by the gap or wear between slider 5 and slide rail 6 on one side, the vibration waveforms detected by the two acceleration sensors 8 are in opposite phase. If this type of abnormal condition occurs continuously within a single detection time of the acceleration sensor 8, it is necessary to shut down the machine for maintenance as soon as possible.

[0029] A progressive distributor 9 is fixedly installed on the top of the slide rail 6. The progressive distributor 9 is a device used for progressively distributing liquids. It includes multiple working pistons, each corresponding to two oil outlets. After lubricating oil is pumped into the progressive distributor 9 via an oil pump and pipeline, the lubricating oil sequentially drives each working piston to move. Only after the current working piston reaches its designated position and the lubricating oil flows out from its corresponding outlet can the oil pump continue pumping to drive the next working piston to move, allowing lubricating oil to flow out from its corresponding outlet. Thus, the progressive distributor 9 achieves the purpose of timed and quantitative delivery of lubricating oil. All oil outlets of the device 9 are fixedly connected to oil supply pipes 11. The ends of the oil supply pipes 11 away from the progressive distributor 9 are fixedly connected to a three-way pipe 12. One end of the three-way pipe 12 away from the oil supply pipe 11 is fixedly connected to an oil injection pipe 10. The oil injection pipe 10 delivers lubricating oil from inside the slide rail 6 to between the slider 5 and the slide rail 6. As the slide block 4 moves the slider 5 up and down, the lubricating oil is gradually consumed. The progressive distributor 9 can achieve the purpose of timed and metered oil pumping, so that the contact surface between the slider 5 and the slide rail 6 is always in a state of uniform lubrication. This avoids the condition that some areas are dry, which would increase the friction between the slider 5 and the slide rail 6 and accelerate the wear of the contact surface, thus ensuring the lubrication effect.

[0030] The other end of the three-way pipe 12, away from the oil supply pipe 11, is fixedly connected to a throttle valve 13. The end of the throttle valve 13, away from the three-way pipe 12, is fixedly connected to the oil tank via a pipe. The throttle valve 13 is a valve that controls the fluid flow rate by changing the throttling cross-section or throttling length. A flow meter (not shown in the figure) is fixedly installed inside the pipe between the throttle valve 13 and the oil tank, and the flow meter is electrically connected to the PLC control system. When the lubricating oil is delivered to the three-way pipe 12 via the progressive distributor 9 and the oil supply pipe 11, if there is no abnormality at the contact surface between the slider 5 and the slide rail 6, under the action of the resistance of the contact surface, some of the lubricating oil will flow back to the oil tank through the throttle valve 13 and the pipe. Under normal conditions, the flow rate of lubricating oil returning to the oil tank via the throttle valve 13 and pipeline, as monitored by the flow meter, is within a certain threshold range. This prevents excessive lubricating oil loss between the slider 5 and the slide rail 6, ensuring normal lubrication. When an abnormality occurs at the contact surface between the slider 5 and the slide rail 6, causing the gap to widen, the resistance of the contact surface decreases, and more lubricating oil flows into the contact surface. Consequently, the flow rate of lubricating oil returning to the oil tank via the throttle valve 13 and pipeline decreases. The PLC control system processes and analyzes the monitoring data from the flow meter to alert the staff when the lubricating oil flow rate is abnormal.

[0031] When the flow meter repeatedly detects a decrease in the flow rate of lubricating oil returning to the oil tank through the throttle valve 13 and pipeline, the PLC control system energizes the electromagnet 17 in advance. This causes the regulating plate 7 and the acceleration sensor 8 to deflect about the axis of rotation 14. The acceleration sensor 8 immediately monitors the travel speed of the slider 5 to determine if there are any abnormalities in the contact surface between the slider 5 and the slide rail 6, helping the staff to troubleshoot in a timely manner. If there are no abnormalities in the contact surface between the slider 5 and the slide rail 6, then the inspection should focus on the operating temperature of the contact surface between the slider 5 and the slide rail 6, the oil pump pipeline, etc. The flow rate of lubricating oil returning to the oil tank through the throttle valve 13 and pipeline is monitored by a flow meter. The lubrication status of the lubricating oil between the slider 5 and the slide rail 6 is used to report abnormal working conditions. The acceleration sensor 8 is triggered to monitor the travel speed of the slide block 4 and the slider 5 in real time. This is to prevent the abnormal working conditions from being undetected and unreported when the acceleration sensor 8 is not in a detection state. This avoids loss of machining accuracy due to the failure to detect sudden abnormalities in time, ensures the stability and consistency of machining accuracy, and improves the overall machining efficiency and equipment reliability.

[0032] Working principle:

[0033] When machining a workpiece, the workpiece is placed on the worktable of the gantry milling machine body 1. In the horizontal direction, the drive source controls the crossbeam 2 to move the slide block 3 and slide ram 4 according to the workpiece position. In the vertical direction, the drive source controls the slide ram 4 to move the machining equipment up and down. When the slide ram 4 moves up and down, the slider 5 and the slide rail 6 are in a relative sliding state. During the process of delivering lubricating oil to the oil inlet of the progressive distributor 9 through the oil pump and pipeline in a timed and quantitative manner, after the lubricating oil is delivered to the three-way pipe 12 through the progressive distributor 9 and the oil delivery pipe 11, part of the lubricating oil flows normally through the oil injection pipe 10 to the contact surface between the slider 5 and the slide rail 6. The movement of the sliding block 5 and the slide rail 6 lubricates the contact surface. Some of the excess lubricating oil flows back to the oil tank through the throttle valve 13 and the pipeline. The flow rate of the lubricating oil flowing back to the oil tank through the throttle valve 13 and the pipeline is monitored by the flow meter. When the contact surface between the sliding block 5 and the slide rail 6 becomes abnormal and the gap increases, the resistance of the contact surface between the sliding block 5 and the slide rail 6 decreases, and more lubricating oil will flow into the contact surface. Therefore, the flow rate of the lubricating oil flowing back to the oil tank through the throttle valve 13 and the pipeline will decrease. The PLC control system processes and analyzes the monitoring data of the flow meter to warn the staff when the lubricating oil flow is abnormal.

[0034] During the up-and-down movement of the slide block 4, the PLC control system periodically energizes the electromagnet 17. When energized, the electromagnet 17 generates a repulsive force on the end of the adjusting plate 7 closest to it. At this time, the end of the adjusting plate 7 furthest from the acceleration sensor 8 experiences a force, and the repulsive force generated by the electromagnet 17 on the end of the adjusting plate 7 closest to it is greater than the elastic force of the rotating shaft 14. This causes the adjusting plate 7 and the acceleration sensor 8 to rotate about the axis of the rotating shaft 14 towards the slider 5 until the detection end of the acceleration sensor 8 contacts the slider 5. Then, during the up-and-down movement of the slider 5, the acceleration sensor 8 monitors the moving speed of the slider 5. When abnormalities occur between the slider 5 and the slide rail 6 due to wear, localized pitting, or the overturning moment generated between the slide block 4 and the processing equipment, etc., [the system detects these abnormalities]. The moving speed of the slide block 4 and the slider 5 will fluctuate, and their acceleration will also fluctuate. The acceleration sensor 8 monitors these abnormal fluctuations and transmits the monitoring data to the PLC control system. The PLC control system processes and analyzes the data and sends an alarm to the staff for abnormal signals. After a single test is completed, the electromagnet 17 is no longer energized, so that the repulsive force between the electromagnet 17 and the adjustment plate 7 disappears. Under the action of the elastic force of the rotating shaft 14, the adjustment plate 7 and the acceleration sensor 8 rotate in the opposite direction around the rotating shaft 14 as the axis to reset, so that the detection end of the acceleration sensor 8 is no longer in contact with the slider 5, so as to prevent the acceleration sensor 8 from being damaged due to continuous contact with the slider 5, which would affect the service life and detection accuracy of the acceleration sensor 8.

[0035] When the flow meter repeatedly detects a decrease in the flow rate of lubricating oil returning to the oil tank through the throttle valve 13 and pipeline, the PLC control system energizes the electromagnet 17 in advance, allowing the acceleration sensor 8 to immediately monitor the travel speed of the slider 5 to determine if there is any abnormality in the contact surface between the slider 5 and the slide rail 6. This helps the staff troubleshoot the problem in a timely manner. If there is no abnormality between the contact surface between the slider 5 and the slide rail 6, then the operating temperature of the contact surface between the slider 5 and the slide rail 6, the oil pump pipeline, etc., need to be inspected. The flow meter monitors the flow rate of lubricating oil returning to the oil tank through the throttle valve 13 and pipeline to provide feedback on abnormal working conditions through the lubrication status of the lubricating oil between the slider 5 and the slide rail 6, and triggers the acceleration sensor 8 to monitor the travel speed of the slide block 4 and the slider 5 in real time. This is to prevent the abnormal working conditions from going undetected and unreported when the acceleration sensor 8 is not in a detection state, thus avoiding loss of processing accuracy due to undetected sudden abnormalities, ensuring the stability and consistency of processing accuracy, and improving overall processing efficiency and equipment reliability.

[0036] 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.

Claims

1. A gantry milling machine tool, comprising a gantry machine tool body (1), and a crossbeam (2) slidably mounted on the top of the gantry machine tool body (1), wherein a slide block (3) is slidably mounted on one side of the crossbeam (2), and a slide block (4) is slidably mounted inside the slide block (3), characterized in that, Two sliders (5) are symmetrically fixedly installed on the outer side of the slide block (4), and two slide rails (6) are symmetrically fixedly installed on the inner side of the slide block (3). Each slider (5) is limited and slidably connected to the corresponding slide rail (6). An adjusting plate (7) is rotatably installed on the top of the slide rail (6). An acceleration sensor (8) is fixedly installed on the side of the adjusting plate (7) near the slider (5). A progressive distributor (9) is fixedly installed on the top of the slide rail (6). The oil outlet of the progressive distributor (9) is fixedly connected to an oil injection pipe (10). The oil outlet of the progressive distributor (9) is also fixedly connected to a throttle valve (13). The end of the throttle valve (13) away from the progressive distributor (9) is fixedly connected to the oil tank through a pipe, and a flow meter is fixedly installed inside the pipe. The acceleration sensor (8) and the flow meter are both connected to the PLC control system signal. The signal connection is used to monitor the abnormal working conditions between the slider (5) and the slide rail (6) in real time and trigger the acceleration sensor (8) in the non-operating state to monitor the travel speed of the slide block (4) and the slider (5) in a timely manner.

2. The overhead crane type gantry machining center according to claim 1, characterized in that, A rotating shaft (14) is fixedly installed on the top of the slide rail (6). The top of the rotating shaft (14) is rotatably connected to the adjusting plate (7) to support the adjusting plate (7).

3. The overhead crane type gantry machining center according to claim 2, characterized in that, A torsion spring (15) is fitted on the outside of the rotating shaft (14). The bottom end of the torsion spring (15) is fixedly connected to the slide rail (6), and the top end of the torsion spring (15) is fixedly connected to the adjusting plate (7). Under the action of the elastic force of the torsion spring (15), the acceleration sensor (8) remains away from the slider (5).

4. The overhead crane type gantry machining center according to claim 1, characterized in that, An mounting plate (16) is fixedly installed on the inner wall of the slide (3). The mounting plate (16) and the acceleration sensor (8) are located on the same side of the adjustment plate (7). An electromagnet (17) is fixedly installed on the side of the mounting plate (16) near the adjustment plate (7). The electromagnet (17) is electrically connected to the PLC control system. The end of the adjustment plate (7) near the electromagnet (17) is made of ferromagnetic material.

5. A crane-type gantry machining center according to claim 1, characterized in that, The oil outlet of the progressive distributor (9) is fixedly connected to the oil supply pipe (11). The end of the oil supply pipe (11) away from the progressive distributor (9) is fixedly connected to the three-way pipe (12). One end of the three-way pipe (12) away from the oil supply pipe (11) is fixedly connected to the oil injection pipe (10).

6. A crane-type gantry machining center according to claim 5, characterized in that, The other end of the three-way pipe (12) away from the oil supply pipe (11) is fixedly connected to the throttle valve (13) to allow excess lubricating oil to flow through the flow space.

7. A crane-type gantry machining center according to claim 2, characterized in that, The adjustment plate (7) is fixedly mounted with a support shaft (18) at the bottom of the end away from the rotating shaft (14). The top of the slide rail (6) is provided with a slide groove (19) that matches the support shaft (18). The adjustment plate (7) is supported by the support shaft (18) to assist in the installation stability of the acceleration sensor (8).

8. A crane-type gantry machining center according to claim 7, characterized in that, The end of the support shaft (18) near the slide groove (19) is arc-shaped to reduce the friction when the support shaft (18) slides inside the slide groove (19).

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