Power head of numerical control machine tool

Abstract

The invention relates to the technical field of power heads, in particular to a numerical control machine tool power head which comprises an installation base, a driving motor is fixedly installed on the outer wall of a matching shell, an electric telescopic arm is fixedly connected with a gear set in the matching shell, and the end, away from the matching shell, of the electric telescopic arm is fixedly connected with a working spindle. A detection mechanism capable of detecting the precision of the working main shaft is further fixedly mounted in the mounting cover, if the main shaft deforms and protrudes, the abutting ball can be jacked up, if the abutting ball is not jacked up, the main shaft is normal, then the servo motor is closed, the spring is reset, the main shaft can be detected regularly, abnormity of the main shaft is found accurately through mechanical and electrical linkage, cost is low, maintenance is easy, and the working efficiency is high. Production loss caused by spindle damage can be avoided, machining precision and production continuity are guaranteed, the problems of deformation, precision deviation and the like of the spindle caused by high temperature and high heat can be accurately captured, complex sensors and monitoring systems are not needed, cost is reduced, and maintenance is easy and convenient.

Description

Technical Field

[0001] The invention relates to the technical field of power heads, in particular to a power head for a numerically controlled machine tool. Background Art

[0002] In modern manufacturing, CNC machine tools are the core equipment for high-precision and high-efficiency processing. The performance of their power heads directly affects the processing quality and production efficiency. The spindle of the power head is the key actuator. During long-term continuous operation, it is very easy to generate heat accumulation due to the combined effect of high-speed rotation and cutting load. When the heat cannot be dissipated in time, the spindle temperature continues to rise, which will cause thermal deformation, resulting in reduced processing accuracy and increased workpiece scrap rate. In severe cases, it may even cause spindle breakage, bearing jamming and other faults, causing equipment shutdown and maintenance, resulting in high maintenance costs and production delay losses; At present, most CNC machine tools have limitations in their spindle monitoring methods. Traditional temperature monitoring methods, such as thermocouples and infrared thermometers, are often single-point or local temperature measurements, which are difficult to fully reflect the overall temperature distribution of the spindle, and there is a response lag problem, and it is impossible to timely warn in the early stage of thermal deformation. Although some equipment has overload protection and simple temperature alarm functions, it lacks a comprehensive analysis of the spindle running time and temperature changes, and cannot effectively predict the risk of overheating deformation caused by long-term operation. In addition, the existing monitoring systems mostly rely on manual intervention, and cannot automatically perform power-off protection when abnormalities occur, which cannot meet the urgent needs of modern automated production for safe and stable operation of equipment. Therefore, the development of a CNC machine tool power head that can monitor the spindle running status in real time and combine timing detection with overheating warning power-off functions has become the key to improving equipment reliability and reducing production losses.

[0003] Chinese patent (publication number CN107297514A), this patented technology discloses a CNC machine tool power head, whose structure includes a motor protective cover, a circuit box, an assembly buckle, a transmission box, a transmission motor, a fixed plate, a spindle controller, an adjustment rod, an electric spindle, a processing tool handle, a guide block, a guide thread, a spindle shaft body, and a rotating axis. The transmission box and the fixed plate are both rectangular structures and are connected by a snap-fit ​​method. The left side of the transmission motor is installed on the upper end of the right side of the transmission box through the fixed plate. The beneficial effect of the invention is that the rotating axis provided inside the electric spindle is mutually fitted with the guide block through the guide thread, thereby ensuring dynamic balance during rotation and preventing forward and backward sliding, improving the processing accuracy, and avoiding processing influence.

[0004] According to the above scheme, when the above scheme is used, only the spindle is rotated. However, when the spindle rotates, overheating will occur, resulting in poor precision, causing damage to the spindle and the processed workpiece, and causing property loss. In order to solve the problem that when the spindle rotates, overheating will occur, resulting in poor precision, causing damage to the spindle and the processed workpiece, we have proposed a CNC machine tool power head. Summary of the invention

[0005] The object of the present invention is to provide a CNC machine tool power head to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A power head for a numerically controlled machine tool comprises a mounting base, a matching shell is fixedly mounted on the upper end of the mounting base, a gear set is mounted inside the matching shell, a driving motor is fixedly mounted on the outer wall of the matching shell, an output end of the driving motor is fixedly connected to the gear set inside the matching shell, a mounting box and a mounting cover are fixedly mounted on the upper end of the mounting base, an electric telescopic arm is rotatably connected inside the mounting box, and the electric telescopic arm is fixedly connected to the gear set inside the matching shell; The end of the electric telescopic arm away from the mating shell is fixedly connected to the working spindle, and the interior of the mounting cover is also fixedly installed with a detection mechanism for detecting the accuracy of the working spindle. The inner wall of the mounting cover is also fixedly installed with a power-off mechanism. When the driving motor drives the electric telescopic arm and the working spindle to rotate at high speed through the gear set, when the working spindle has poor accuracy or high-temperature deformation, the detection mechanism will drive the power-off mechanism to cut off the power.

[0007] As a further feature of the present invention, the detection mechanism includes a mounting tube, which is fixedly connected to the upper end of the mounting base by cooperating with the mounting frame. The interior of the mounting tube is rotatably connected to a plurality of swing arms with a reset function. The interior of the swing arm is slidably connected to a movable arm. The movable arm is fixedly connected to the inner wall of the swing arm by a fourth spring. The fourth spring will drive the movable arm and the swing arm to reset quickly. The fourth spring can drive the movable arm and the swing arm to quickly return to their original positions. Firstly, it can greatly shorten the reset time of the equipment, so that the equipment can be quickly put into the next round of work, significantly improving work efficiency. Secondly, timely reset avoids wear and damage that may be caused by the movable arm and the swing arm being in an abnormal position for a long time, effectively extending the service life of the components.

[0008] As a further feature of this solution, the fourth spring sleeve is mounted on the outer wall of the movable arm, and both ends of the movable arm are clamped with abutment balls. The end of the mounting tube away from the mating mounting frame is slidably connected to a mobile connection ring with a reset function, and the mobile connection ring is fixedly connected to a conductive ring close to the mounting tube. The abutment ball is designed to be spherical, which can effectively reduce the friction between its outer wall and the object. Smaller friction means that the wear and tear generated during contact and relative movement with the object is greatly reduced. On the one hand, the material consumption caused by friction loss is reduced, so that the abutment ball itself can maintain a good physical state and performance for a longer time, without the need for frequent replacement, reducing the cost of use. On the other hand, for the object in contact with it, the risk of scratches and wear is also reduced due to the small friction.

[0009] As a further feature of this solution, the conductive ring is fixedly connected to a second abutting annular tube, and the end of the conductive ring away from the mounting tube is fixedly connected to a mounting annular box, the mounting annular box is filled with helium, and the mounting annular box is slidably connected to a piston ring, and the piston ring is fixedly connected to the inner wall of the mounting annular box by a plurality of third springs, and the piston ring can move back and forth according to the expansion of the gas. The piston ring can move back and forth freely according to the expansion or contraction of the gas by virtue of its flexible structural characteristics. This high degree of freedom of movement ensures that it can accurately respond to subtle changes in gas pressure. When the gas in the annular box is heated and expanded to generate pressure, the piston ring can react quickly in a very short time, promote the subsequent mechanical structure to move, and realize rapid transmission. When the gas pressure decreases and contracts, the piston ring can quickly reset and drive the system back to its initial state.

[0010] As a further feature of the present invention, one end of the piston ring away from the mounting ring box is fixedly connected to a moving ring, and an upper end of the moving ring is fixedly connected to an abutment block, and the moving ring can drive the abutment block to move.

[0011] As a further feature of the present invention, a servo motor capable of driving the movable connecting ring to move is fixedly mounted on the upper end of the mounting base, and the servo motor has the characteristics of fast response speed and high precision.

[0012] As a further feature of the present invention, the power-off mechanism comprises a connecting frame, the upper end of which is slidably connected to a stress-bearing bar with a reset function. The stress-bearing bar can withstand a large force and is not easily damaged.

[0013] As a further feature of the present invention, the bottoms of the two stress-bearing bars are fixedly connected with connecting clip bars, and one end of the installation box close to the connecting frame is fixedly connected with a fifth spring, and the fifth spring is sleeved on the outer wall of the working spindle.

[0014] As a further feature of the present invention, one end of the fifth spring away from the working spindle is fixedly connected to a matching reset tube, the upper end of the matching reset tube is fixedly connected to a clamping column, and the outer wall of the clamping column abuts against the outer wall of the connecting clamping strip.

[0015] As a further feature of the present invention, a matching socket is fixedly connected to the upper end of the mounting base, and a mounting plug is fixedly connected to the bottom of the matching reset tube, and the mounting plug is plugged into the inside of the matching socket.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. When the present invention is used, the driving motor is started to drive the electric telescopic arm and the working spindle to rotate. When the spindle is running, the servo motor is started every ten minutes, and the pull rope is pulled by the recovery wheel to drive the conductive ring and other components to energize and rotate the swing arm, and its abutment ball contacts the outer wall of the spindle. If the spindle is deformed and bulged, the abutment ball will be lifted up. If it is not lifted up, it means that the spindle is normal. Then the servo motor is turned off and the spring is reset. The spindle can be detected regularly, and the spindle abnormality can be accurately detected by mechanical and electrical linkage. It has low cost and easy maintenance, can avoid production losses caused by spindle damage, ensure processing accuracy and production continuity, and can accurately capture the deformation and precision deviation of the spindle caused by high temperature and heat. It does not require complex sensors and monitoring systems, reduces costs and is easy to maintain.

[0017] 2. When the present invention is used, if a bulge appears on the working spindle, the abutment ball drives the moving arm to make another abutment ball abut against the inner wall of the conductive ring, and the current is connected to the conductive ring and the mounting ring box, so that the plurality of third springs quickly heat up due to the high voltage electricity, and the helium in the mounting ring box expands due to the heat, pushing the piston ring, the moving ring and the abutment block to move. After the abutment block contacts the force-bearing bar, the force-bearing bar and the connecting clip bar move upward, and the connecting clip bar is disengaged from the limit of the clip column. The fifth spring in the force storage state drives the matching reset tube and the clip column to move, so that the mounting plug quickly disengages from the matching socket to complete power-off. It can respond quickly when a bulge or deformation appears on the spindle, and realize rapid power-off through thermal and electrical linkage, so as to avoid further damage to the workpiece due to spindle precision and deformation problems, effectively reduce economic losses, and improve the safety and reliability of equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is a front view of a CNC machine tool power head.

[0019] Figure 2 The present invention is a schematic diagram of the internal structure of a matching shell in a power head of a CNC machine tool.

[0020] Figure 3 The present invention is a structural schematic diagram of a detection mechanism in a power head of a CNC machine tool.

[0021] Figure 4 The figure is a side view of a detection mechanism in a power head of a CNC machine tool.

[0022] Figure 5 This is a schematic diagram of the disassembly of a detection mechanism in a CNC machine tool power head.

[0023] Figure 6 The figure is a schematic diagram of the position structure of a servo motor in a CNC machine tool power head.

[0024] Figure 7 The figure is a schematic diagram of the internal structure of a swing arm in a power head of a CNC machine tool.

[0025] Figure 8 The figure is a schematic diagram of the position structure of a force bar in a power head of a CNC machine tool.

[0026] Fig. 9 The present invention is a structural schematic diagram of a power-off mechanism in a power head of a CNC machine tool.

[0027] Fig.10 The present invention is a schematic diagram of the position structure of an abutting bending block in a power head of a CNC machine tool.

[0028] In the figure: 1, driving motor; 2, matching shell; 3, mounting box; 4, working spindle; 5, mounting cover; 6, electric telescopic arm; 7, mounting base; 8, servo motor; 9, matching mounting frame; 10, mounting tube; 11, mounting ring box; 12, first abutting ring; 13, conductive ring; 14, swing arm; 15, second spring; 16, sliding rod; 18, pull rope; 19. Mobile connecting ring; 20. Third spring; 21. Abutment block; 22. Mobile ring; 23. Abutment round rod; 24. Recovering wire wheel; 25. Second abutment circular ring tube; 26. Abutment ball; 27. Mobile arm; 28. Fourth spring; 29. ​​Force strip; 30. Connecting clamp strip; 31. Connecting frame; 32. Clamping column; 33. Fifth spring; 35. Matching reset tube; 36. Matching socket; 37. Installing plug; 38. Abutting inclined block; 39. Sixth spring; 40. Abutting curved block; 41. Piston ring; 101. Detection mechanism; 201. Power-off mechanism. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example 1: Please refer to Figure 1-2As shown, in the embodiment of the present invention, a power head of a numerically controlled machine tool includes a mounting base 7, a matching shell 2 is fixedly mounted on the upper end of the mounting base 7, a gear set is installed inside the matching shell 2, a driving motor 1 is fixedly mounted on the outer wall of the matching shell 2, the output end of the driving motor 1 is fixedly connected to the gear set inside the matching shell 2, a mounting box 3 and a mounting cover 5 are fixedly mounted on the upper end of the mounting base 7, an electric telescopic arm 6 is rotatably connected to the inside of the mounting box 3 through a rotating shaft, the driving motor 1 can limit the speed of the electric telescopic arm 6 through the gear set, the electric telescopic arm 6 is fixedly connected to the gear set inside the matching shell 2, a conductive block is fixedly connected to the outer wall of the electric telescopic arm 6, a conductive matching ring is also fixedly connected to the inside of the mounting box 3, a ring groove is provided inside the conductive matching ring, the outer wall of the conductive block abuts against the inner wall of the ring groove, when the electric telescopic arm 6 rotates, the outer wall of the conductive block is driven to abut and move against the inner wall of the ring groove, the conductive matching ring is energized to transmit power to the electric telescopic arm 6 through the conductive block, which is not shown in the figure; The end of the electric telescopic arm 6 away from the matching shell 2 is fixedly connected to the working spindle 4, and the interior of the installation cover 5 is also fixedly installed with a detection mechanism 101 that can detect the accuracy of the working spindle 4. The inner wall of the installation cover 5 is also fixedly installed with a power-off mechanism 201. When the driving motor 1 drives the electric telescopic arm 6 and the working spindle 4 to rotate at a high speed through the gear set, when the working spindle 4 has poor accuracy or high-temperature deformation, the detection mechanism 101 will drive the power-off mechanism 201 to cut off the power; Example 2: Please refer to Figure 3 to Figure 7 As shown, the detection mechanism 101 includes a mounting tube 10, which is fixedly connected to the upper end of the mounting base 7 by cooperating with the mounting frame 9, and a plurality of swing arms 14 with a reset function are rotatably connected inside the mounting tube 10. Specifically, a plurality of openings are opened inside the mounting tube 10, and the plurality of openings are circumferentially distributed on the outer wall of the mounting tube 10, and each swing arm 14 is rotatably connected to the inner wall of the corresponding opening, and a reset torsion spring is clamped between the swing arm 14 and the opening, and a moving arm 27 is slidably connected inside the swing arm 14, and the moving arm 27 is fixedly connected to the inner wall of the swing arm 14 by a fourth spring 28, and the fourth spring 28 is sleeved on the outer wall of the moving arm 27, and both ends of the moving arm 27 are clamped with abutment balls 26, which are spherical. When the abutment balls 26 abut against the outer wall of the working spindle 4 for a long time, friction will occur, and wear will occur. Since the abutment balls 26 are clamped on the outer wall of the moving arm 27, the abutment balls 26 can be easily replaced; One end of the mounting tube 10 away from the matching mounting frame 9 is slidably connected to a movable connecting ring 19 having a reset function. Specifically, The movable connecting ring 19 is fixedly connected to one end close to the mounting tube 10 with a plurality of sliding rods 16, and the plurality of sliding rods 16 are distributed in a circle on the outer wall of the movable connecting ring 19, and each sliding rod 16 is slidably connected to the inside of the mounting tube 10, and each sliding rod 16 is fixedly connected to the mounting tube 10 through a second spring 15, and each second spring 15 is sleeved on the outer wall of the corresponding sliding rod 16, and the movable connecting ring 19 is fixedly connected to a conductive ring 13 close to the mounting tube 10, and a second abutting circular ring tube 25 is fixedly connected inside the conductive ring 13, and the inner wall diameter of the second abutting circular ring tube 25 is larger than the outer wall diameter of the mounting tube 10, when the inner wall of the second abutting circular ring tube 25 abuts against the outer wall of the mounting tube 10, the second abutting circular ring tube 25 will abut against the angle between the swing arm 14 and the mounting tube 10, and push the swing arm 14, and the end of the conductive ring 13 away from the mounting tube 10 is fixedly connected to the mounting circular ring box 11; The interior of the mounting ring box 11 is filled with helium, which is a light gas with low density and high thermal conductivity. Its intermolecular force is weak. When heated, molecules are more likely to obtain energy and move quickly, causing the gas volume to expand rapidly. A piston ring 41 is slidably connected to the interior of the mounting ring box 11. The piston ring 41 is fixedly connected to the inner wall of the mounting ring box 11 by a plurality of third springs 20. The plurality of third springs 20 are distributed in a circle between the piston ring 41 and the inner wall of the mounting ring box 11. The third spring 20 is made of beryllium bronze, which is a copper alloy containing beryllium, with high strength, high hardness, good wear resistance and corrosion resistance, high electrical conductivity and thermal conductivity. The end of the piston ring 41 away from the mounting ring box 11 is fixedly connected to a moving ring 22, and the upper end of the moving ring 22 is fixedly connected to an abutment block 21. The mounting bottom A servo motor 8 is fixedly installed on the upper end of the seat 7, which can drive the mobile connecting ring 19 to move. The outer wall of the mounting frame 9 is fixedly connected with an abutting round rod 23. Specifically, the output end of the servo motor 8 is fixedly connected with two recovery wire wheels 24, and the outer wall of each recovery wire wheel 24 is wound with a pull rope 18. The free end of each pull rope 18 is fixedly connected to the inner wall of the conductive ring 13. When the servo motor 8 is started, the servo motor 8 will drive all the recovery wire wheels 24 to rotate, and the recovery wire wheels 24 will recycle and pull the pull rope 18. When the pull rope 18 is pulled, it will pull the conductive ring 13, and the conductive ring 13 will drive the mobile connecting ring 19 to move. The mobile connecting ring 19 will move through the sliding rod 16, and the outer wall of the abutting round rod 23 will abut against the outer walls of all the pull ropes 18, and the abutting round rod 23 can guide the pull rope 18. See also Figure 4 , Figure 8 to Figure 10As shown, the power-off mechanism 201 includes a connecting frame 31, the upper end of the connecting frame 31 is slidably connected to a force-bearing strip 29 with a reset function, the force-bearing strip 29 and the connecting frame 31 are fixedly connected by a first spring, the bottoms of the two force-bearing strips 29 are fixedly connected to a connecting clamping strip 30, the end of the installation box 3 close to the connecting frame 31 is fixedly connected to a fifth spring 33, the fifth spring 33 is sleeved on the outer wall of the working spindle 4, the end of the fifth spring 33 away from the working spindle 4 is fixedly connected to a matching reset tube 35, the upper end of the matching reset tube 35 is fixedly connected to a clamping column 32, at this time the fifth spring 33 is in a state of storing force, the outer wall of the clamping column 32 abuts against the outer wall of the connecting clamping strip 30, the upper end of the mounting base 7 is fixedly connected to a matching socket 36, the bottom of the matching reset tube 35 is fixedly connected to a mounting plug 37, and the mounting plug 37 is internally plugged into the matching socket 36; One end of the working spindle 4 close to the connecting frame 31 is fixedly connected to the first abutting ring 12, and the outer wall of the matching reset tube 35 is also slidably connected to a plurality of abutting bevel blocks 38 with a reset function. The plurality of abutting bevel blocks 38 are circumferentially distributed on the outer wall of the matching reset tube 35, and each abutting bevel block 38 is fixedly connected to the matching reset tube 35 through a sixth spring 39. One end of the abutting bevel block 38 close to the matching reset tube 35 is fixedly connected to an abutting curved arc block 40, and the abutting curved arc block 40 is located inside the matching reset tube 35. When the accuracy of the working spindle 4 deviates, the matching reset tube 35 drives all the abutting bevel blocks 38 to abut against the inner wall of the first abutting ring 12, and all the abutting bevel blocks 38 move toward the center Gather together. When the abutting bevel block 38 is squeezed, the abutting bevel block 38 will squeeze and accumulate force on the sixth spring 39, and the abutting bevel block 38 will drive the abutting arc block 40 to move. At this time, all the abutting arc blocks 40 will abut against the outer wall of the working spindle 4, limit the working spindle 4, and brake the working spindle 4 to prevent the working spindle 4 from continuing to rotate and causing damage to the workpiece. The opposite ends of all the abutting arc blocks 40 are fixedly connected with rubber sheets, which can enhance the friction between the abutting arc blocks 40 and the working spindle 4. When all the abutting bevel blocks 38 are disengaged from the inner wall of the first abutting ring 12, the sixth spring 39 will release the accumulated force to drive the abutting bevel blocks 38 and the abutting arc blocks 40 to reset.

[0031] The working principle of the present invention is: When the present invention is used, the driving motor 1 is started, and the electric telescopic arm 6 is driven to rotate through the matching shell 2, and the electric telescopic arm 6 drives the working spindle 4 to rotate. When the working spindle 4 rotates at a high speed, due to the long-term use of the working spindle 4, high temperature and high heat will occur, and the outer wall and the shape will deviate and deform, and the accuracy will also deviate. When the working spindle 4 rotates at a high speed, the servo motor 8 is started every ten minutes. When the servo motor 8 is started, the servo motor 8 will drive all the recovery wire wheels 24 to rotate, and the recovery wire wheels 24 will recover and pull the pull rope 18. When the pull rope 18 is pulled, it will pull the conductive ring 13, and the conductive ring 13 drives the mobile connecting ring 19 to move, and the mobile connecting ring 19 will Move by sliding rod 16. Note that at this time, high voltage electricity is passed through swing arm 14, and the electricity of swing arm 14 will be connected to moving arm 27. When the second abutting annular tube 25 abuts against the angle between swing arm 14 and mounting tube 10, all swing arms 14 will rotate. When the abutting ball 26 at one end of swing arm 14 close to working spindle 4 abuts against the outer wall of working spindle 4, and working spindle 4 rotates at high speed and deforms or bends and bulges, abutting ball 26 will be lifted up. If the corresponding abutting ball 26 is not lifted up, it means that there is no problem with the outer wall of working spindle 4 and there is no error in accuracy. At this time, servo motor 8 is turned off, and second spring 15 drives conductive ring 13 and second abutting annular tube 25 to reset. If the working spindle 4 has a bulge problem, the abutment ball 26 will drive the moving arm 27 and the other abutment ball 26 to move. When the other abutment ball 26 abuts against the inner wall of the conductive ring 13, the electricity will be connected to the conductive ring 13, and the conductive ring 13 will connect the electricity to the mounting ring box 11. At this time, all the third springs 20 will be energized and quickly heat up. It is worth noting that due to the high voltage electricity, and multiple abutment balls 26 will continuously abut against the inner wall of the conductive ring 13, the third springs 20 will be continuously energized. At this time, the helium inside the mounting ring box 11 will expand due to the heat, and the expansion will drive the piston ring 41 to move, the piston ring 41 will drive the moving ring 22 to move, and the moving ring 22 will drive the abutment block 21 to move in the direction of the force bar 29 When the outer wall of the abutment block 21 abuts against the outer wall of the force-bearing bar 29, the inclined surface of the abutment block 21 will abut against the bottom of the force-bearing bar 29, and the force-bearing bar 29 moves upward, and the force-bearing bar 29 drives the connecting clip bar 30 to move upward, and the connecting clip bar 30 will be separated from the abutment with the outer wall of the clip post 32. At this time, the clip post 32 loses its limit. Since the fifth spring 33 is in a state of storing force, the fifth spring 33 will drive the matching reset tube 35 to reset and move, and the matching reset tube 35 will drive the clip post 32 to move, and at this time, it will also drive the installation plug 37 to quickly disengage from the plug-in inside the matching socket 36, completing a rapid power-off, thereby avoiding further damage to the workpiece due to the accuracy and deformation of the working spindle 4, causing economic losses; The working spindle 4 can also be driven to move by the electric telescopic arm 6, so that the abutment ball 26 can perform abutment detection on multiple positions of the working spindle 4. When the working spindle 4 is replaced, the pulling of the matching reset tube 35 and the temperature of the helium gas drops. At this time, the third spring 20 will drive the abutment block 21 and the movable ring 22 to reset through the piston ring 41. The second abutment annular tube 25 and the conductive ring 13 are reset under the action of the second spring 15, and the clamping column 32 is re-clamped on the outer wall of the connecting clamping strip 30. At this time, the fifth spring 33 accumulates force to pull the matching reset tube 35, so that the clamping column 32 is tightly clamped and limited with the outer wall of the connecting clamping strip 30, completing the reset, and the detection of the next side can be carried out.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A CNC machine tool power head, comprising a mounting base (7), characterized in that: A matching shell (2) is fixedly mounted on the upper end of the mounting base (7), a gear set is mounted inside the matching shell (2), a driving motor (1) is fixedly mounted on the outer wall of the matching shell (2), an output end of the driving motor (1) is fixedly connected to the gear set inside the matching shell (2), a mounting box (3) and a mounting cover (5) are fixedly mounted on the upper end of the mounting base (7), an electric telescopic arm (6) is rotatably connected inside the mounting box (3), and the electric telescopic arm (6) is fixedly connected to the gear set inside the matching shell (2); The end of the electric telescopic arm (6) away from the mating shell (2) is fixedly connected to the working spindle (4), and a detection mechanism (101) capable of detecting the accuracy of the working spindle (4) is also fixedly installed inside the mounting cover (5). A power-off mechanism (201) is also fixedly installed on the inner wall of the mounting cover (5). When the driving motor (1) drives the electric telescopic arm (6) and the working spindle (4) to rotate at a high speed through the gear set, when the working spindle (4) has poor accuracy or high-temperature deformation, the detection mechanism (101) will drive the power-off mechanism (201) to cut off the power.

2. A CNC machine tool power head according to claim 1, characterized in that: The detection mechanism (101) comprises a mounting tube (10), wherein the mounting tube (10) is fixedly connected to the upper end of the mounting base (7) by means of a matching mounting frame (9), wherein a plurality of swing arms (14) having a reset function are rotatably connected inside the mounting tube (10), wherein a movable arm (27) is slidably connected inside the swing arm (14), and wherein the movable arm (27) is fixedly connected to the inner wall of the swing arm (14) via a fourth spring (28).

3. A CNC machine tool power head according to claim 2, characterized in that: The fourth spring (28) is sleeved on the outer wall of the movable arm (27), and both ends of the movable arm (27) are clamped with abutment balls (26). The end of the mounting tube (10) away from the matching mounting frame (9) is slidably connected to a movable connecting ring (19) with a reset function, and the movable connecting ring (19) is fixedly connected to a conductive ring (13) close to the mounting tube (10).

4. A CNC machine tool power head according to claim 3, characterized in that: A second abutting annular tube (25) is fixedly connected inside the conductive ring (13); an end of the conductive ring (13) away from the mounting tube (10) is fixedly connected to a mounting annular box (11); the interior of the mounting annular box (11) is filled with helium; a piston ring (41) is slidably connected inside the mounting annular box (11); the piston ring (41) is fixedly connected to the inner wall of the mounting annular box (11) via a plurality of third springs (20).

5. A CNC machine tool power head according to claim 4, characterized in that: One end of the piston ring (41) away from the mounting ring box (11) is fixedly connected to a moving ring (22), and the upper end of the moving ring (22) is fixedly connected to an abutment block (21).

6. A CNC machine tool power head according to claim 3, characterized in that: A servo motor (8) capable of driving the movable connecting ring (19) to move is fixedly mounted on the upper end of the mounting base (7).

7. A CNC machine tool power head according to claim 1, characterized in that: The power-off mechanism (201) comprises a connecting frame (31), the upper end of the connecting frame (31) being slidably connected to a stress-bearing bar (29) having a reset function.

8. A CNC machine tool power head according to claim 7, characterized in that: The bottoms of the two force-bearing bars (29) are fixedly connected to a connecting clamping bar (30), and one end of the installation box (3) close to the connecting frame (31) is fixedly connected to a fifth spring (33), and the fifth spring (33) is sleeved on the outer wall of the working spindle (4).

9. A CNC machine tool power head according to claim 8, characterized in that: One end of the fifth spring (33) away from the working spindle (4) is fixedly connected to a matching reset tube (35), and the upper end of the matching reset tube (35) is fixedly connected to a clamping column (32), and the outer wall of the clamping column (32) abuts against the outer wall of the connecting clamping strip (30).

10. A CNC machine tool power head according to claim 9, characterized in that: The upper end of the mounting base (7) is fixedly connected to a matching socket (36), the bottom of the matching reset tube (35) is fixedly connected to a mounting plug (37), and the mounting plug (37) is internally plugged into the matching socket (36).

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