Dynamic balance detection device of long rod body structure for main shaft

Abstract

The invention relates to the technical field of detection equipment, in particular to a dynamic balance detection device of a long rod body structure for a main shaft, which comprises a clamping structure used for clamping a cutter bar, a measuring structure connected with the clamping structure and used for detecting the dynamic balance of the cutter bar, and a power structure used for providing rotation power for the measuring structure and the cutter bar, the measuring structure comprises two flat plates distributed up and down and a middle body located between the two flat plates, and a plurality of guide rods parallel to each other are connected between the two flat plates; the cutter bar is allowed to freely move during rotation by adopting a flexible connection mode, so that interference on the rotation eccentricity of the cutter bar in a traditional hard connection mode is avoided, the detection accuracy is improved, the eccentricity of the cutter bar in the horizontal direction when the cutter bar rotates is converted into the change of the distance between the middle body and the flat plate in the vertical direction, and the detection accuracy is improved. Therefore, the interference of the rotating motion of the cutter bar on the distance detection can be avoided, and the distance detection is more stable and accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of detection equipment, and particularly relates to a dynamic balance detection device for a long rod structure of a spindle. Background Art

[0002] In the fields of high-end CNC machine tools and precision machining, as the core component connecting the machine tool spindle and the cutting tool, the dynamic balance performance of the spindle tool bar directly affects the machining accuracy, surface quality and equipment life. With the popularization of technologies such as high-speed machining and five-axis linkage, due to the large length-diameter ratio (usually exceeding 8:1) and long overhang length of the long rod structure of the tool bar, it is extremely vulnerable to the influence of centrifugal force and aerodynamic effects during high-speed rotation, leading to problems such as non-linear vibration and thermal deformation. The traditional dynamic balance detection method is to directly connect one end of the tool bar to the rotating shaft of the motor output end through a coupling or other structures to drive the tool bar to rotate, and then measure the eccentricity of the other end of the tool bar during rotation through a rangefinder to detect whether the dynamic balance of the tool bar is qualified. However, since the connection between the tool bar and the rotating shaft is a rigid connection in this method, it will interfere with the rotation eccentricity of the tool bar and affect the detection accuracy. Moreover, since the measurement of the eccentricity is carried out under the rotating state of the tool bar, the vibration caused by the centrifugal force of the tool bar (such as bending vibration and torsional vibration) will cause the instantaneous displacement fluctuation on its surface, and this fluctuation will cause the inaccuracy of the measurement signal. Summary of the Invention

[0003] The present invention provides a dynamic balance detection device for a long rod structure of a spindle, which can effectively solve the problems in the background art.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: A dynamic balance detection device for a long rod structure of a spindle, comprising a clamping structure for clamping the tool bar, a measuring structure connected to the clamping structure and used for detecting the dynamic balance of the tool bar, and a power structure for providing rotational power for the measuring structure and the tool bar; The measuring structure includes two flat plates distributed vertically and an intermediate body located between the two flat plates. A plurality of mutually parallel guide rods are connected between the two flat plates, and each guide rod passes through the intermediate body. The intermediate body and the plurality of guide rods are used to guide the two flat plates so that they can perform relative translational movement in any horizontal direction. One flat plate is connected to the power structure, and the other flat plate is connected to the clamping structure; Wherein, a laser rangefinder for detecting the distance therebetween is arranged between the intermediate body and one of the flat plates.

[0005] In some embodiments of the present invention, a push-pull unit is arranged between the intermediate body and one of the flat plates, and the push-pull unit is used to provide a vertical thrust to the tool bar.

[0006] In some embodiments of the present invention, the push-pull unit includes a first electromagnetic disk and a second electromagnetic disk that exert forces on each other, the force being a suction force or a repulsive force. The first electromagnetic disk is disposed on the intermediate body, and the second electromagnetic disk is disposed on one of the flat plates.

[0007] In some embodiments of the present invention, the magnitude of the force between the first electromagnetic disk and the second electromagnetic disk can be adjusted and set.

[0008] In some embodiments of the present invention, an outer ring is disposed outside the second electromagnetic disk. The outer ring is fixed to the corresponding flat plate. A circular groove is formed on the circumferential inner wall of the outer ring. An inner disk is disposed in the circular groove. A plurality of rolling bodies are rotatably disposed on the upper and lower surfaces of the inner disk. The inner disk moves in the circular groove by means of the plurality of rolling bodies. Wherein, a plurality of curved arm structures are disposed between the first electromagnetic disk and the second electromagnetic disk, and the plurality of curved arm structures are used to align the first electromagnetic disk and the second electromagnetic disk in the vertical direction.

[0009] In some embodiments of the present invention, the measuring structure further includes a distance measuring unit, and the distance measuring unit is used to measure the inclination direction and inclination distance of the guide rod on the flat plate or the intermediate body.

[0010] In some embodiments of the present invention, the distance measuring unit includes a support plate disposed on the flat plate or the intermediate body. The support plate is located outside one of the guide rods. An electrode ring is disposed on the guide rod. Two electrode plates that cooperate with the electrode ring are disposed on the support plate, and the two electrode plates are separated from each other.

[0011] In some embodiments of the present invention, the clamping structure includes a support cylinder installed at the bottom of the corresponding flat plate. A plurality of clamping portions are disposed in the support cylinder, and the plurality of clamping portions are circumferentially distributed around the support cylinder. Each clamping portion includes two tooth columns that mesh with each other. Oblique arms are inclined on each tooth column, and the inclination directions of the two oblique arms are opposite. Electromagnetic suction plates are disposed on each oblique arm. The two tooth columns are elastically connected by an elastic body.

[0012] In some embodiments of the present invention, the clamping structure further includes a synchronous ring coaxially disposed with the support cylinder. A plurality of sliding columns are disposed on the synchronous ring, and the sliding columns slide on the support cylinder along the axial direction of the support cylinder. The synchronous ring is rotatably connected to one of the oblique arms in each clamping portion by a connecting arm.

[0013] In some embodiments of the present invention, the electromagnetic suction plate rotates on the inclined arm, and the center of gravity of the electromagnetic suction plate is located below the rotation axis of the electromagnetic suction plate; A plurality of through grooves are formed in the electromagnetic suction plate along its own length direction, and the length direction of the through grooves is perpendicular to the length direction of the electromagnetic suction plate. One end of the through groove penetrates to the side wall of the electromagnetic suction plate, and the penetration directions of two adjacent through grooves are opposite.

[0014] Through the technical solution of the present invention, the following technical effects can be achieved: By adopting a flexible connection method, the tool bar is allowed to move freely during rotation, thus avoiding the interference of the rotation eccentricity of the tool bar in the traditional rigid connection method, improving the detection accuracy, and by converting the eccentricity of the tool bar in the horizontal direction during rotation into the change of the distance between the intermediate body and the flat plate in the vertical direction, the interference of the rotation movement of the tool bar itself on the distance detection can be avoided, making the distance detection more stable and accurate; by introducing gravity into the measurement work, it is convenient to reversely limit the centrifugal force of the tool bar, avoiding the random movement of the tool bar due to the centrifugal force, resulting in the inability to accurately measure the eccentricity of the tool bar; based on the measurement method of centrifugal force, the measurement work can be made simpler and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 is a structural schematic diagram of the present invention; Figure 2 is an exploded structural schematic diagram of the clamping structure and the measurement structure in an embodiment of the present invention; Figure 3 is a structural schematic diagram of the measurement structure in an embodiment of the present invention; Figure 4 is a structural schematic diagram of the push-pull unit in an embodiment of the present invention; Figure 5 is a structural schematic diagram of the clamping structure in an embodiment of the present invention; Figure 6 is a structural schematic diagram of the clamping part in an embodiment of the present invention; Figure 7 is Figure 6 a structural schematic diagram of the clamping part from another perspective; Figure 8 is a structural schematic diagram of the electromagnetic suction plate in an embodiment of the present invention.

[0017] Reference numerals: 100, tool shank; 200, clamping structure; 201, support cylinder; 202, clamping part; 203, tooth column; 204, inclined arm; 205, electromagnetic suction plate; 206, elastic body; 207, synchronizing ring; 208, connecting arm; 209, sliding column; 210, through groove; 211, narrow opening; 212, long opening; 213, arc-shaped wide opening; 300, measuring structure; 301, flat plate; 302, intermediate body; 303, guide rod; 304, laser rangefinder; 305, push-pull unit; 306, first electromagnetic disk; 307, second electromagnetic disk; 308, outer ring; 309, inner disk; 310, rolling body; 311, first connecting arm; 312, second connecting arm; 313, support plate; 314, electrode plate; 315, electrode ring; 400, power structure. Detailed implementation manners

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs. The terms used in the specification of this invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0020] As Figures 1 to 2 shown, a dynamic balance detection device for a long rod structure of a main shaft according to the present invention includes a clamping structure 200 for clamping a tool shank 100, a measuring structure 300 connected to the clamping structure 200 and used to detect the dynamic balance of the tool shank 100, and a power structure 400 for providing rotational power for the measuring structure 300 and the tool shank 100; The measuring structure 300 includes two flat plates 301 arranged vertically and an intermediate body 302 located between the two flat plates 301. A plurality of mutually parallel guide rods 303 are connected between the two flat plates 301, and each guide rod 303 passes through the intermediate body 302. The intermediate body 302 and the plurality of guide rods 303 are used to guide the two flat plates 301 so that they can perform relative translational motion in any horizontal direction. One flat plate 301 is connected to the power structure 400, and the other flat plate 301 is connected to the clamping structure 200; Wherein, a laser rangefinder 304 for detecting the distance therebetween is provided between the intermediate body 302 and one flat plate 301; In the present invention, the power structure 400, the measurement structure 300, the clamping structure 200, and the tool shank 100 are arranged in sequence from top to bottom. The tool shank 100 is vertical and fixed on the clamping structure 200, so that the above structures can be kept in a natural state by gravity. And to improve the detection accuracy, it is necessary to make the axis of the tool shank 100, the center point of the clamping structure 200, the center point of the measurement structure 300, and the operating axis of the power structure 400 on the same vertical line. The clamping structure 200 is used to clamp and fix the tool shank 100 to achieve the connection work. The measurement structure 300 is used to measure the eccentricity of the tool shank 100 when it rotates, so as to determine whether the dynamic balance of the tool shank 100 is qualified according to the eccentricity. The power structure 400 can be a conventional structure such as a servo motor, which provides power for the rotation of the measurement structure 300, the clamping structure 200, and the tool shank 100. In some embodiments, when it is necessary to measure the tool shank 100 at different rotational speeds, it can be achieved by adjusting the output rotational speed of the power structure 400. To facilitate understanding of how the measurement structure 300 specifically realizes the detection work, the measurement structure 300 is explained in detail here. The two flat plates 301 and the intermediate body 302 on the measurement structure 300 are distributed in the vertical direction. A number of mutually parallel guide rods 303 are used to connect the flat plate 301 and the intermediate body 302. In this way, when the lower flat plate 301 deviates, the number of guide rods 303 and the intermediate body 302 can guide it, enabling it to move in any direction, and the lower flat plate 301 always remains in a horizontal state, so that the tool shank 100 can always remain in a vertical state. The intermediate body 302 provided here can play the role of auxiliary support for a number of guide rods 303, so that the distance between the points of a number of guide rods 303 on the intermediate body 302 remains constant, thus avoiding the mutual torsion of a number of guide rods 303 and causing the two flat plates 301 to not be able to maintain a parallel state. The position of the upper flat plate 301 can be fixed by the power structure 400, while the lower flat plate 301 can move in any direction, thereby realizing the soft connection work of the tool shank 100, avoiding interference with the eccentricity of the tool shank 100 during hard connection, and at the same time enabling the tool shank 100 to always remain in a vertical state. Since when the lower flat plate 301 moves, a number of guide rods 303 guide the lower flat plate 301, when the lower flat plate 301 moves in the horizontal direction, it will also generate a displacement in the vertical direction, that is, the vertical distance between the intermediate body 302 and the two flat plates 301 will change. In this way, by directly detecting the distance between the intermediate body 302 and any one of the flat plates 301 with a laser rangefinder 304, the detection work of the eccentricity of the tool shank 100 can be realized. This detection method is not affected by the rotation movement of the tool shank 100 itself, so its anti-interference ability is stronger and the detection accuracy is higher. It should be noted that the above detection method converts the rotational motion of the tool shank 100 into the change in the distance between the intermediate body 302 and any flat plate 301. Therefore, the bending vibration and torsional vibration generated when the tool shank 100 rotates will not interfere with the detection of the laser rangefinder 304 in the vertical direction. As long as the tool shank 100 rotates smoothly at the specified rotational speed, the distance between the intermediate body 302 and any flat plate 301 can be stabilized; Furthermore, when the tool shank 100 rotates, its centrifugal force will cause the tool shank 100 to perform eccentric motion. The eccentric motion of the tool shank 100 will cause its displacement in the vertical direction, and this displacement needs to overcome the gravity of the tool shank 100. Therefore, the motion of the tool shank 100 is comprehensively affected by gravity and its own rotational speed. Without the action of gravity, when the tool shank 100 rotates, it will move in any direction and displacement, making it impossible to measure its eccentricity; in addition, gravity can help the tool shank 100 return to its position in the natural state, that is, position the initial position of the tool shank 100. Therefore, by using the combined action of the centrifugal force and gravity when the tool shank 100 rotates, the eccentricity of the tool shank 100 can be detected more stably and accurately; By adopting a flexible connection method, the tool shank 100 is allowed to move freely during rotation, thus avoiding the interference with the rotational eccentricity of the tool shank 100 in the traditional rigid connection method and improving the detection accuracy. And by converting the eccentricity of the tool shank 100 in the horizontal direction during rotation into the change in the distance between the intermediate body 302 and the flat plate 301 in the vertical direction, the interference of the rotational motion of the tool shank 100 itself on the distance detection can be avoided, making the distance detection more stable and accurate; by introducing gravity into the measurement work, it is convenient to reversely limit the centrifugal force of the tool shank 100 and avoid the tool shank 100 moving randomly due to the centrifugal force, resulting in the inability to accurately measure the eccentricity of the tool shank 100; the measurement method based on centrifugal force can make the measurement work simpler and more convenient; In actual operation, the structure can be placed in a vacuum chamber for measurement to reduce air interference. And to reduce the influence of friction during measurement, electromagnetic suspension support or other low-friction support methods can be adopted for each rotating component; the laser rangefinder 304 can be installed on any flat plate 301 or the intermediate body 302, as long as it can measure the vertical distance between the intermediate body 302 and any flat plate 301; since the guide rod 303 needs to be rotatably connected to both the flat plate 301 and the intermediate body 302 to allow the lower flat plate 301 to move in any direction, spheres need to be provided at both ends and the middle of the guide rod 303 and connected to the corresponding flat plate 301 and intermediate body 302 using the spheres.

[0021] Based on the above implementation, since gravity is one of the important factors affecting the rotational eccentricity distance of the tool bar 100, when the specified eccentricity limit range is small, that is, when the detection is relatively strict, the eccentricity can be amplified. Specifically, as Figure 2 , a push-pull unit 305 is provided between the intermediate body 302 and a flat plate 301. The push-pull unit 305 is used to provide a vertical thrust to the tool bar 100. The push-pull unit 305 can be installed between the upper flat plate 301 and the intermediate body 302, or can be installed between the lower flat plate 301 and the intermediate body 302. As long as it can provide a force to the corresponding flat plate 301 or the intermediate body 302, the force can be transmitted to the tool bar 100. When the push-pull unit 305 provides an upward pulling force to the intermediate body 302 or the flat plate 301, the pulling force cancels out part of the gravity of the tool bar 100. At this time, the eccentricity generated by the tool bar 100 due to the centrifugal force increases, thereby increasing the range, facilitating detection, and avoiding the more prominent influence of external interference factors on the eccentricity when the eccentricity limit range is small, resulting in inaccurate detection; In some embodiments, when the eccentricity of the tool bar 100 is large and exceeds the relative movement range of the two flat plates 301, the push-pull unit 305 can be used to provide a downward thrust to the corresponding intermediate body 302 or the lower flat plate 301 to increase the acting force along the gravity direction of the tool bar 100, thereby canceling out part of the centrifugal force and reducing the eccentricity distance of the tool bar 100; Using the above structural method, the eccentricity distance of the tool bar 100 can be adjusted according to the actual situation, thereby facilitating the detection of tool bars 100 with different specifications or different detection requirements.

[0022] Based on the above implementation, as Figures 3 to 4 shown, the push-pull unit 305 includes a first electromagnetic disk 306 and a second electromagnetic disk 307 that have a force acting on each other. The acting force is a suction force or a repulsive force. The first electromagnetic disk 306 is arranged on the intermediate body 302, and the second electromagnetic disk 307 is arranged on a flat plate 301. The acting force between the first electromagnetic disk 306 and the second electromagnetic disk 307 can be transmitted to the intermediate body 302 and a flat plate 301, thereby achieving the effect of providing an acting force to the corresponding intermediate body 302 or the flat plate 301 in the vertical direction. Since the acting force can be a suction force or a repulsive force, the direction of the acting force can be changed by adjusting the current in the first electromagnetic disk 306 or the second electromagnetic disk 307.

[0023] Since when detecting tool bars 100 with different specifications or adopting different specification detection requirements, the acting force provided by the push-pull unit 305 to the tool bar 100 needs to be adjustable to change the eccentricity of the tool bar 100 and facilitate detection, the magnitude of the acting force between the first electromagnetic disk 306 and the second electromagnetic disk 307 can be set to be adjustable; In some embodiments, the magnitude of the acting force can be adjusted by changing the magnitude of the current, changing the distance between the first electromagnetic disk 306 and the second electromagnetic disk 307, and other means.

[0024] When the tool shank 100 rotates and becomes eccentric, the intermediate body 302 and the flat plate 301 move relative to each other. At this time, the first electromagnetic disk 306 and the second electromagnetic disk 307 are misaligned, which results in a reduction in the effective range of the interaction force between the first electromagnetic disk 306 and the second electromagnetic disk 307. To ensure that the first electromagnetic disk 306 and the second electromagnetic disk 307 are always facing each other in the vertical direction, the following can be adopted Figure 4 As shown in the figure, an outer ring 308 is provided on the outer side of the second electromagnetic disk 307. The outer ring 308 is fixed to the corresponding flat plate 301. A circular groove is formed on the circumferential inner wall of the outer ring 308. An inner disk 309 is arranged in the circular groove. A plurality of rolling bodies 310 are rotatably arranged on the upper and lower surfaces of the inner disk 309. The inner disk 309 moves in the circular groove by means of the plurality of rolling bodies 310; Among them, a plurality of curved arm structures are arranged between the first electromagnetic disk 306 and the second electromagnetic disk 307. The plurality of curved arm structures are used to align the first electromagnetic disk 306 and the second electromagnetic disk 307 in the vertical direction; By using the outer ring 308 and the plurality of rolling bodies 310 in the above structure, the position of the inner disk 309 can be limited, and the inner disk 309 is allowed to move in the horizontal direction. At the same time, the friction between the inner disk 309 and the outer ring 308 can be reduced. In this way, when the intermediate body 302 and the flat plate 301 move relative to each other, the first electromagnetic disk 306 can drive the second electromagnetic disk 307 to move horizontally synchronously through the plurality of curved arm structures. The first electromagnetic disk 306 and the second electromagnetic disk 307 always face each other, and the curved arm structures are deformed. The distance between the first electromagnetic disk 306 and the second electromagnetic disk 307 changes. The second electromagnetic disk 307 drives the inner disk 309 to move in the circular groove on the outer ring 308, and the curved arm structures are bent; In some embodiments, the specific structure of the curved arm structure can be a first connecting arm 311 and a second connecting arm 312 that are rotatably connected to each other. The first connecting arm 311 is rotatably connected to the inner disk 309. The support plate 313 is rotatably connected to the first electromagnetic disk 306. The radial line of the curved arm structure on the first electromagnetic disk 306 and the plane where the axis of the first electromagnetic disk 306 is located are perpendicular to the rotation axes of the respective rotation nodes on the curved arm structure. Thus, the orientation of the first electromagnetic disk 306 and the second electromagnetic disk 307 can be realized by using the plurality of curved arm structures, so that they are kept in an aligned state and the distance between them is allowed to change.

[0025] When performing dynamic balance detection on the tool shank 100, if it is necessary to determine the eccentricity distance and eccentric mass of the tool shank 100 to facilitate subsequent adjustment work, the following can be adopted Figure 3In the manner shown, the measuring structure 300 further includes a distance measuring unit for measuring the inclination direction and inclination distance of the guide rod 303 on the flat plate 301 or the intermediate body 302; By detecting the inclination direction and inclination distance of the guide rod 303 using the distance measuring unit, the eccentricity direction and eccentricity distance of the tool shank 100 can be determined. Then, based on the mass of the tool shank 100, various parameters of the dynamic balance of the tool shank 100 can be determined, facilitating subsequent use of methods such as adding counterweights or drilling to reduce weight to bring the tool shank 100 to a balanced state; Using the above method, not only can it be detected whether the dynamic balance of the tool shank 100 is qualified, but also the specific unqualified parameters of the tool shank 100 can be measured; in some embodiments, the eccentricity parameters can also be determined according to the distance detected by the laser rangefinder 304 and in combination with the determination of the inclination direction of the guide rod 303 by the distance measuring unit.

[0026] Based on the above implementation, as Figure 3 shown, the distance measuring unit includes a support plate 313 disposed on the flat plate 301 or the intermediate body 302. The support plate 313 is located outside one guide rod 303, and an electrode ring 315 is provided on the guide rod 303. Two electrode plates 314 cooperating with the electrode ring 315 are provided on the support plate 313, and the two electrode plates 314 are separated from each other; In the present invention, the support plate 313 is mainly used to support the two electrode plates 314. Both electrode plates 314 can form a capacitive structure with the electrode ring 315. Then, by using the change in capacitance value in the two capacitive structures when the guide rod 303 is inclined, the distance between the electrode ring 315 and the two electrode plates 314 can be deduced in reverse. Using these two distance values, the position of the guide rod 303 after inclination, that is, the eccentricity distance and eccentricity direction of the tool shank 100, can be calculated; It should be noted that since capacitance is generated between the electrode plate 314 and the electrode ring 315, it is necessary to configure conventional structures such as a power supply, a capacitance detector, a display, and a controller for the distance measuring structure externally.

[0027] In some embodiments of the present invention, as Figures 5 to 7 shown, the clamping structure 200 includes a support cylinder 201 installed at the bottom of the corresponding flat plate 301. A plurality of clamping portions 202 are provided inside the support cylinder 201, and the plurality of clamping portions 202 are circumferentially distributed around the support cylinder 201; The clamping portion 202 includes two tooth columns 203 that mesh with each other. Oblique arms 204 are inclined on each tooth column 203, and the inclination directions of the two oblique arms 204 are opposite. Electromagnetic suction plates 205 are provided on each oblique arm 204; The two tooth columns 203 are elastically connected by an elastic body 206; It should be noted that the supporting cylinder 201 is mainly used to provide a supporting position for several clamping parts 202. The two tooth columns 203 are meshed with each other. When one tooth column 203 rotates, the other tooth column 203 rotates synchronously in the opposite direction. As a result, the two inclined arms 204 move relatively synchronously. The inclined arm 204 can push the electromagnetic suction plate 205 against the outer wall of the tool bar 100. Then, the electromagnetic suction plate 205 is energized, so that the electromagnetic suction plate 205 adsorbs on the tool bar 100, realizing the fastening work of the tool bar 100. Since the two tooth columns 203 move synchronously, the two electromagnetic suction plates 205 can simultaneously squeeze and fix the tool bar 100, thus ensuring that the tool bar 100 is vertical. Since the two inclined arms 204 are inclined and the inclined directions are opposite, when the tool bar 100 has an upward movement tendency, the lower inclined inclined arm 204 will have a movement tendency towards the outer wall of the tool bar 100 due to the friction between the corresponding electromagnetic suction plate 205 and the tool bar 100, thereby achieving a more firm extrusion effect on the tool bar 100. When the tool bar 100 has a downward movement tendency, the upper inclined arm 204 will provide a more firm extrusion effect for the tool bar 100, thereby improving the firmness of the tool bar 100. When the electromagnetic suction plate 205 is powered off, in order to ensure that the electromagnetic suction plate 205 returns to its natural state, the elastic force of the elastic body 206 needs to be utilized.

[0028] Based on the above implementation, as Figures 5 to 6 shown, the clamping structure 200 further includes a synchronous ring 207 coaxially arranged with the supporting cylinder 201. A number of sliding columns 209 are arranged on the synchronous ring 207, and the sliding columns 209 slide on the supporting cylinder 201 along the axial direction of the supporting cylinder 201. The synchronous ring 207 is rotatably connected to one inclined arm 204 of each clamping part 202 through a connecting arm 208. The synchronous ring 207 is connected to the upper inclined arms 204 or the lower inclined arms 204 of each clamping part 202. When one inclined arm 204 moves, it will push the synchronous ring 207 to move in the vertical direction through the connecting arm 208. The synchronous ring 207 will drive the sliding column 209 to slide on the supporting cylinder 201. At the same time, the synchronous ring 207 drives the corresponding inclined arm 204 to move through the remaining several connecting arms 208, so that several clamping parts 202 are all in a moving state, realizing the synchronous movement process of several clamping parts 202 and realizing the fixed-axis work of the tool bar 100.

[0029] Based on the above implementation, as Figures 7 to 8 shown, the electromagnetic suction plate 205 rotates on the inclined arm 204, and the center of gravity of the electromagnetic suction plate 205 is located below the rotation axis of the electromagnetic suction plate 205. A plurality of through grooves 210 are formed in the electromagnetic suction plate 205 along its own length direction, and the length direction of the through grooves 210 is perpendicular to the length direction of the electromagnetic suction plate 205. One end of the through groove 210 penetrates to the side wall of the electromagnetic suction plate 205, and the penetration directions of two adjacent through grooves 210 are opposite; In the present invention, the rotation setting of the electromagnetic suction plate 205 and the limitation of the center of gravity of the electromagnetic suction plate 205 can ensure that the electromagnetic suction plate 205 is vertical in the natural state, so that the electromagnetic suction plate 205 can accurately fit the outer wall of the tool bar 100, and avoid the electromagnetic suction plate 205 tilting relative to the tool bar 100 when clamping tool bars 100 with different diameters; The arrangement of a plurality of through grooves 210 on the electromagnetic suction plate 205 allows the electromagnetic suction plate 205 to generate a certain amount of deformation, so as to facilitate its fitting with tool bars 100 of different diameters and achieve a surface contact effect; to improve the strength of the electromagnetic suction plate 205 during deformation and avoid its fracture, the through groove 210 can adopt a combination of a narrow opening 211, a long opening 212 and an arc-shaped wide opening 213, such as Figure 8 shown, the diameter of the arc-shaped wide opening 213 is the largest. In this way, when the electromagnetic suction plate 205 is deformed, it is not easy to tear, and the arrangement of the narrow opening 211 can reduce the opening of the through groove 210, so as to correspondingly increase the area of the adjacent arc-shaped wide opening 213, facilitate the protection of the deformation position of the arc-shaped wide opening 213, and improve the overall strength of the electromagnetic suction plate 205.

[0030] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A dynamic balance detection device for a long rod structure of a main shaft, characterized in that, It includes a clamping structure for clamping a tool shank, a measuring structure connected to the clamping structure and used for detecting the dynamic balance of the tool shank, and a power structure for providing rotational power for the measuring structure and the tool shank; The measuring structure includes two flat plates distributed vertically and an intermediate body located between the two flat plates. A number of mutually parallel guide rods are connected between the two flat plates, and each of the guide rods passes through the intermediate body. The intermediate body and the number of guide rods are used to guide the two flat plates so that they can perform relative translational movement in any horizontal direction. One of the flat plates is connected to the power structure, and the other flat plate is connected to the clamping structure; Wherein, a laser rangefinder for detecting the distance therebetween is provided between the intermediate body and one of the flat plates.

2. The dynamic balance detection device for a long rod structure of a main shaft according to claim 1, wherein A push-pull unit is provided between the intermediate body and one of the flat plates, and the push-pull unit is used to provide a thrust in the vertical direction to the tool shank.

3. The dynamic balance detection device for the long rod structure of the main shaft according to claim 2, characterized in that, The push-pull unit includes a first electromagnetic disk and a second electromagnetic disk that have an acting force between them. The acting force is a suction force or a repulsive force. The first electromagnetic disk is arranged on the intermediate body, and the second electromagnetic disk is arranged on one of the flat plates.

4. The dynamic balance detection device for a long rod structure of a main shaft according to claim 3, characterized in that, The magnitude of the acting force between the first electromagnetic disk and the second electromagnetic disk can be adjusted and set.

5. The dynamic balance detection device for a long rod structure of a main shaft according to claim 3, characterized in that, An outer ring is arranged outside the second electromagnetic disk, and the outer ring is fixed to the corresponding flat plate. A circular groove is formed on the circumferential inner wall of the outer ring, and an inner disk is arranged in the circular groove. A number of rolling bodies are rotatably arranged on the upper and lower surfaces of the inner disk, and the inner disk moves in the circular groove by means of the number of rolling bodies; Wherein, a number of curved arm structures are arranged between the first electromagnetic disk and the second electromagnetic disk, and the number of curved arm structures are used to align the first electromagnetic disk and the second electromagnetic disk in the vertical direction.

6. The dynamic balance detection device with a long rod structure for the main shaft according to claim 1, wherein, The measuring structure further includes a distance measuring unit, and the distance measuring unit is used to measure the inclination direction and inclination distance of the guide rod on the flat plate or the intermediate body.

7. The dynamic balance detection device for the long rod structure of the main shaft according to claim 6, characterized in that, The distance measuring unit includes a support plate arranged on the flat plate or the intermediate body. The support plate is located outside one of the guide rods, and an electrode ring is arranged on the guide rod. Two electrode plates used in cooperation with the electrode ring are arranged on the support plate, and the two electrode plates are separated from each other.

8. The dynamic balance detection device for the long rod structure of the main shaft according to claim 1, characterized in that, The clamping structure includes a support cylinder body installed at the bottom of the corresponding flat plate. A number of clamping parts are arranged in the support cylinder body, and the number of clamping parts are circumferentially distributed around the support cylinder body; The clamping part includes two tooth columns that mesh with each other. Oblique arms are inclinedly arranged on each of the tooth columns, and the inclination directions of the two oblique arms are opposite. Electromagnetic suction plates are arranged on each of the oblique arms; The two tooth columns are elastically connected by an elastic body.

9. The dynamic balance detection device for the long rod structure of the main shaft according to claim 8, characterized in that, The clamping structure further includes a synchronous ring coaxially arranged with the support cylinder body. A number of sliding columns are arranged on the synchronous ring, and the sliding columns slide on the support cylinder body along the axis direction of the support cylinder body; The synchronous ring is rotatably connected to one of the oblique arms in each of the clamping parts through a connecting arm.

10. The dynamic balance detection device for the long rod structure of the main shaft according to claim 9, characterized in that, The electromagnetic suction plate rotates on the oblique arm, and the center of gravity of the electromagnetic suction plate is located below the rotation axis of the electromagnetic suction plate; A plurality of through grooves are formed in the electromagnetic suction plate along its own length direction, and the length direction of the through grooves is perpendicular to the length direction of the electromagnetic suction plate. One end of the through groove penetrates through the side wall of the electromagnetic suction plate, and the penetration directions of two adjacent through grooves are opposite.

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