A dynamic balance detection device with a long rod structure for a main shaft

Abstract

The present invention relates to the technical field of detection equipment, and in particular to a dynamic balance detection device of a long rod structure for a spindle, comprising a clamping structure for clamping a tool rod, a measuring structure connected to the clamping structure and used for detecting the dynamic balance of the tool rod, and a power structure for providing rotational power to the measuring structure and the tool rod; the measuring structure comprises two flat plates distributed up and down and an intermediate body located between the two flat plates, and a plurality of mutually parallel guide rods are connected between the two flat plates; by adopting a soft connection method, the tool rod is allowed to move freely during rotation, thereby avoiding the interference of the traditional hard connection method with the eccentricity of the tool rod rotation, improving the detection accuracy, and by converting the eccentricity of the tool rod in the horizontal direction into the change of the distance between the intermediate body and the flat plate in the vertical direction during rotation, the interference of the tool rod rotation movement itself on the distance detection can be avoided, making the distance detection more stable and accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of detection equipment, and in particular to a dynamic balance detection device with a long rod structure for a main shaft. Background Art

[0002] In the field of high-end CNC machine tools and precision machining, the spindle toolholder is the core component connecting the machine tool spindle and the cutting tool. Its dynamic balance performance directly affects the machining accuracy, surface quality and equipment life. With the popularization of high-speed machining and five-axis linkage technologies, the long rod structure of the toolholder is highly susceptible to centrifugal force and aerodynamic effects when rotating at high speeds due to its large aspect ratio (usually exceeding 8:1) and long overhang. This can cause problems such as nonlinear vibration and thermal deformation.

[0003] The traditional dynamic balancing test method is to directly connect one end of the tool rod to the rotating shaft of the motor output end through a coupling or other structure, thereby driving the tool rod to rotate, and then use a distance meter to measure the eccentricity of the other end of the tool rod during rotation, so as to detect whether the dynamic balance of the tool rod is qualified. However, since this method has a hard connection between the tool rod and the rotating shaft, it will interfere with the eccentricity of the tool rod rotation and affect the detection accuracy. In addition, since the eccentricity is measured when the tool rod is rotating, the vibration caused by the centrifugal force of the tool rod (such as bending vibration and torsional vibration) will cause fluctuations in its instantaneous displacement, which will cause inaccurate measurement signals. Summary of the Invention

[0004] The present invention provides a dynamic balance detection device with a long rod structure for a main shaft, which can effectively solve the problems in the background technology.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A dynamic balance detection device for a long rod structure for a spindle, comprising a clamping structure for clamping a tool bar, a measuring structure connected to the clamping structure and for detecting the dynamic balance of the tool bar, and a power structure for providing rotational power to the measuring structure and the tool bar;

[0007] The measuring structure includes two upper and lower plates and an intermediate body located between the two plates. A plurality of mutually parallel guide rods are connected between the two plates, and each of the guide rods passes through the intermediate body. The intermediate body and the plurality of guide rods are used to guide the two plates so that they can perform relative translational motion in any horizontal direction. One of the plates is connected to the power structure, and the other plate is connected to the clamping structure.

[0008] Wherein, a laser rangefinder is provided between the intermediate body and one of the flat plates for detecting the distance therebetween.

[0009] In some embodiments of the present invention, 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 vertical thrust to the knife rod.

[0010] In some embodiments of the present invention, the push-pull unit includes a first electromagnetic disk and a second electromagnetic disk having a mutual force, the force being suction or repulsion, the first electromagnetic disk being arranged on the intermediate body, and the second electromagnetic disk being arranged on one of the flat plates.

[0011] In some embodiments of the present invention, the magnitude of the acting force between the first electromagnetic magnetic disk and the second electromagnetic magnetic disk can be adjusted.

[0012] In some embodiments of the present invention, an outer ring is provided on the outer side of the second electromagnetic disk, the outer ring is fixed on the corresponding flat plate, a circular groove is provided on the inner wall of the outer ring, an inner disk is provided in the circular groove, and a plurality of rolling elements are rotatably provided on the upper and lower surfaces of the inner disk, and the inner disk moves in the circular groove by means of the plurality of rolling elements;

[0013] A plurality of curved arm structures are provided between the first electromagnetic magnetic disk and the second electromagnetic magnetic disk, and the plurality of curved arm structures are used to align the first electromagnetic magnetic disk and the second electromagnetic magnetic disk in a vertical direction.

[0014] 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 tilt direction and tilt distance of the guide rod on the flat plate or the intermediate body.

[0015] In some embodiments of the present invention, the ranging unit includes a support plate arranged on the flat plate or the intermediate body, the support plate is located on the outside of one of the guide rods, and the guide rod is provided with an electrode ring, and the support plate is provided with two electrode plates used in conjunction with the electrode ring, and the two electrode plates are separated from each other.

[0016] In some embodiments of the present invention, the clamping structure includes a supporting cylinder installed at the bottom of the corresponding flat plate, a plurality of clamping parts are provided in the supporting cylinder, and the plurality of clamping parts are distributed circumferentially around the supporting cylinder;

[0017] The clamping portion includes two mutually meshing tooth columns, each of which is provided with an oblique arm, and the two oblique arms are inclined in opposite directions, and each oblique arm is provided with an electromagnetic suction plate;

[0018] The two tooth columns are elastically connected via an elastic body.

[0019] In some embodiments of the present invention, the clamping structure further comprises a synchronization ring coaxially arranged with the support cylinder, the synchronization ring being provided with a plurality of slide posts, the slide posts sliding on the support cylinder along the axis direction of the support cylinder;

[0020] The synchronizer ring is rotatably connected to one of the oblique arms in each of the clamping parts via a connecting arm.

[0021] In some embodiments of the present invention, 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;

[0022] The electromagnetic suction plate is provided with a plurality of through slots along its length direction, and the length direction of the through slots is perpendicular to the length direction of the electromagnetic suction plate. One end of the through slots penetrates the side wall of the electromagnetic suction plate, and the penetration directions of two adjacent through slots are opposite.

[0023] The technical solution of the present invention can achieve the following technical effects:

[0024] By adopting a soft connection method, the tool rod is allowed to move freely during rotation, thereby avoiding the interference of the traditional hard connection method on the eccentricity of the tool rod rotation, improving the detection accuracy, and by converting the eccentricity of the tool rod in the horizontal direction into the change of the distance between the intermediate body and the plate in the vertical direction during rotation, the interference of the tool rod rotation movement itself on the distance detection can be avoided, making the distance detection more stable and accurate; by introducing gravity into the measurement work, the centrifugal force of the tool rod can be conveniently restricted in the reverse direction, avoiding the tool rod from moving arbitrarily due to the centrifugal force, resulting in the inability to accurately measure the eccentricity of the tool rod; the measurement method based on centrifugal force can make the measurement work simpler and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 Schematic diagram of the exploded structure of the clamping structure and the measuring structure in an embodiment of the present invention;

[0028] Figure 3 is a schematic structural diagram of a measurement structure in an embodiment of the present invention;

[0029] Figure 4 2 is a schematic structural diagram of a push-pull unit in an embodiment of the present invention;

[0030] Figure 5 is a structural schematic diagram of the clamping structure in an embodiment of the present invention;

[0031] Figure 6 is a structural schematic diagram of a clamping portion in an embodiment of the present invention;

[0032] Figure 7 yes Figure 6 A schematic structural diagram of the middle clamping part from another perspective;

[0033] Figure 8 Schematic diagram of the structure of the electromagnetic suction plate in an embodiment of the present invention.

[0034] Reference numerals:

[0035] 100, knife bar;

[0036] 200, clamping structure; 201, supporting cylinder; 202, clamping part; 203, tooth column; 204, inclined arm; 205, electromagnetic suction plate; 206, elastic body; 207, synchronization ring; 208, connecting arm; 209, sliding column; 210, through groove; 211, narrow opening; 212, long opening; 213, arc-shaped wide opening;

[0037] 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 element; 311, first connecting arm; 312, second connecting arm; 313, support plate; 314, electrode plate; 315, electrode ring;

[0038] 400. Power structure. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] like Figures 1 to 2As shown, a dynamic balance detection device for a long rod structure for a spindle of the present invention includes a clamping structure 200 for clamping a tool bar 100, a measuring structure 300 connected to the clamping structure 200 and used for detecting the dynamic balance of the tool bar 100, and a power structure 400 for providing rotational power to the measuring structure 300 and the tool bar 100;

[0042] The measurement structure 300 includes two upper and lower flat plates 301 and an intermediate body 302 located between the two plates 301. Several parallel guide rods 303 are connected between the two plates 301, and each guide rod 303 passes through the intermediate body 302. The intermediate body 302 and the guide rods 303 are used to guide the two plates 301, enabling relative translational motion in any horizontal direction. One plate 301 is connected to the power structure 400, and the other plate 301 is connected to the clamping structure 200.

[0043] A laser rangefinder 304 is provided between the intermediate body 302 and a flat plate 301 for detecting the distance therebetween.

[0044] In the present invention, the power structure 400, the measuring structure 300, the clamping structure 200 and the tool rod 100 are arranged in sequence from top to bottom, and the tool rod 100 is vertically fixed on the clamping structure 200, so that gravity can be used to keep the above structures in a natural state, and in order to improve the detection accuracy, it is necessary to make the axis of the tool rod 100, the center point of the clamping structure 200, the center point of the measuring structure 300 and the running axis of the power structure 400 on the same vertical line; the clamping structure 200 is used to support and fix the tool rod 100 to achieve the connection work, and the measuring structure 300 is used to measure the eccentricity of the tool rod 100 when it rotates, so as to determine whether the dynamic balance of the tool rod 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 measuring structure 300, the clamping structure 200 and the tool rod 100; in some embodiments, when it is necessary to measure different speeds of the tool rod 100, it can be achieved by adjusting the output speed of the power structure 400;

[0045] To facilitate understanding of how the measuring structure 300 specifically implements the detection work, the measuring structure 300 is explained in detail here. The two flat plates 301 and the intermediate body 302 on the measuring structure 300 are distributed in the vertical direction, and a number of mutually parallel guide rods 303 are used to connect the flat plates 301 and the intermediate body 302. In this way, when the lower flat plate 301 deviates, the several guide rods 303 and the intermediate body 302 can guide it so that it can move in any direction, and the lower flat plate 301 always remains in a horizontal state, so that the knife rod 100 can always remain in a vertical state. The intermediate body 302 provided here can serve as an auxiliary support for the several guide rods 303, so that the distance between the points of the several guide rods 303 on the intermediate body 302 remains constant, thereby preventing the several guide rods 303 from twisting with each other, causing the two flat plates 301 to be unable to remain parallel; the upper flat plate The position of 301 can be fixed by the power structure 400, and the lower plate 301 can be moved in any direction, thereby realizing the soft connection of the knife rod 100, avoiding interference with the eccentricity of the knife rod 100 during hard connection, and at the same time enabling the knife rod 100 to always maintain a vertical state; because the lower plate 301 is guided by the plurality of guide rods 303 when it moves, when the lower plate 301 moves in the horizontal direction, it will also be displaced in the vertical direction, that is, the vertical distance between the intermediate body 302 and the two plates 301 will change, so the laser rangefinder 304 is used to directly detect the distance between the intermediate body 302 and any plate 301, so that the eccentricity of the knife rod 100 can be detected, and this detection method will not be affected by the rotation of the knife rod 100 itself, so it has stronger anti-interference ability and higher detection accuracy;

[0046] It should be noted that the above detection method converts the rotational motion of the tool bar 100 into a change in the distance between the intermediate body 302 and any flat plate 301. Therefore, bending vibration and torsional vibration generated by the rotation of the tool bar 100 will not interfere with the vertical detection of the laser rangefinder 304. As long as the tool bar 100 rotates smoothly at a specified speed, the distance between the intermediate body 302 and any flat plate 301 can be stabilized.

[0047] It is further understood that, when the knife rod 100 rotates, its centrifugal force causes the knife rod 100 to perform eccentric movement, and the eccentric movement of the knife rod 100 causes its displacement in the vertical direction, and this displacement needs to overcome the gravity of the knife rod 100. Therefore, the movement of the knife rod 100 is affected by the combined influence of gravity and its own rotation speed. If there is no effect of gravity, then when the knife rod 100 rotates, it will move in any direction and displacement, so that its eccentricity cannot be measured. In addition, gravity can help the knife rod 100 to restore its position in a natural state, that is, to locate the initial position of the knife rod 100. Therefore, by utilizing the combined effect of the centrifugal force and gravity when the knife rod 100 rotates, the eccentricity of the knife rod 100 can be detected more stably and accurately.

[0048] By adopting a flexible connection method, the tool rod 100 is allowed to move freely during rotation, thereby avoiding the interference of the traditional hard connection method on the rotation eccentricity of the tool rod 100, improving the detection accuracy, and by converting the eccentricity of the tool rod 100 in the horizontal direction into the change of the distance between the intermediate body 302 and the flat plate 301 in the vertical direction during rotation, the interference of the rotation movement of the tool rod 100 itself on the distance detection can be avoided, making the distance detection more stable and accurate; by introducing gravity into the measurement work, the centrifugal force of the tool rod 100 can be conveniently restricted in the reverse direction, avoiding the tool rod 100 from moving arbitrarily due to the centrifugal force, resulting in the inability to accurately measure the eccentricity of the tool rod 100; the measurement method based on centrifugal force can make the measurement work simpler and more convenient;

[0049] In actual operation, the structure can be placed in a vacuum box for measurement to reduce air interference, and in order to reduce the influence of friction during measurement, electromagnetic suspension support or other low-friction support methods can be used for each rotating component; the laser rangefinder 304 can be installed on any plate 301 or the intermediate body 302, as long as it can measure the vertical distance between the intermediate body 302 and any plate 301; since the guide rod 303 and the plate 301 and the intermediate body 302 need to be rotatably connected, so that the lower plate 301 can be allowed to move in any direction, spheres need to be set at both ends and the middle of the guide rod 303, and the spheres are used to connect to the corresponding plate 301 and the intermediate body 302.

[0050] Based on the above implementation, since gravity is one of the important factors affecting the eccentric distance of the knife bar 100, when the eccentricity limit range is small, that is, when the detection is more strict, the eccentricity can be magnified. Specifically, Figure 2, a push-pull unit 305 is provided between the intermediate body 302 and a flat plate 301, and the push-pull unit 305 is used to provide a vertical thrust to the knife rod 100; the push-pull unit 305 can be installed between the upper flat plate 301 and the intermediate body 302, or between the lower flat plate 301 and the intermediate body 302. As long as it can provide a force for the corresponding flat plate 301 or the intermediate body 302, the force can be transmitted to the knife rod 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 offsets part of the gravity of the knife rod 100. At this time, the eccentricity of the knife rod 100 due to the centrifugal force increases, thereby increasing the range, facilitating detection, and avoiding the situation where the influence of external interference factors on the eccentricity is more prominent when the eccentricity limit range is small, resulting in an inability to perform accurate detection;

[0051] In some embodiments, when the eccentricity of the knife rod 100 is large and exceeds the relative motion range of the two plates 301, the push-pull unit 305 can be used to provide a downward thrust to the corresponding intermediate body 302 or the lower plate 301 to increase the force acting along the gravity direction of the knife rod 100, thereby offsetting part of the centrifugal force and reducing the eccentricity of the knife rod 100.

[0052] By utilizing the above-mentioned structural manner, the eccentric distance of the tool rod 100 can be adjusted according to actual conditions, thereby facilitating the detection of tool rods 100 of different specifications or different detection requirements.

[0053] Based on the above implementation, Figures 3 and 4 As shown, the push-pull unit 305 includes a first electromagnetic disk 306 and a second electromagnetic disk 307 that have an acting force on each other, and the acting force is suction or repulsion. 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 flat plate 301 in the vertical direction; since the acting force can be suction or repulsion, 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.

[0054] When testing tool rods 100 of different specifications or when different specifications are used for testing, the force provided by the push-pull unit 305 to the tool rod 100 needs to be adjustable to change the eccentricity of the tool rod 100 and facilitate testing. The force between the first electromagnetic disk 306 and the second electromagnetic disk 307 can be adjusted.

[0055] In some embodiments, the magnitude of the applied 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 so on.

[0056] When the 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 will be 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. In order to ensure that the first electromagnetic disk 306 and the second electromagnetic disk 307 are always in a vertically facing state, the following method can be used: Figure 4 In the embodiment shown, 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 provided on the inner wall of the outer ring 308. An inner disk 309 is provided in the circular groove. A plurality of rolling elements 310 are rotatably provided on the upper and lower surfaces of the inner disk 309. The inner disk 309 moves in the circular groove by means of the rolling elements 310.

[0057] A plurality of curved arm structures are provided between the first electromagnetic magnetic disk 306 and the second electromagnetic magnetic disk 307 , and the plurality of curved arm structures are used to align the first electromagnetic magnetic disk 306 and the second electromagnetic magnetic disk 307 in the vertical direction;

[0058] The outer ring 308 and the plurality of rolling elements 310 in the above-described structure can define the position of the inner disk 309 and allow the inner disk 309 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 magnet 306 can drive the second electromagnetic magnet 307 to move horizontally synchronously via the plurality of crank structures. The first electromagnetic magnet 306 and the second electromagnetic magnet 307 always maintain a positive facing state. The crank structure deforms, and the distance between the first electromagnetic magnet 306 and the second electromagnetic magnet 307 changes. The second electromagnetic magnet 307 drives the inner disk 309 to move within the circular groove on the outer ring 308, causing the crank structure to bend.

[0059] In some embodiments, the specific structure of the crank 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, and the support plate 313 is rotatably connected to the first electromagnetic disk 306. The radial line of the crank 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 axis of each rotating node on the crank arm structure. Therefore, several crank arm structures can be used to guide the first electromagnetic disk 306 and the second electromagnetic disk 307, so that they remain aligned and the distance between them is allowed to change.

[0060] When performing dynamic balancing on the tool bar 100, if it is necessary to determine the eccentric distance and eccentric mass of the tool bar 100 to facilitate subsequent adjustment, the following method can be used: Figure 3In the manner shown, the measuring structure 300 further includes a distance measuring unit, which is used to measure the tilt direction and tilt distance of the guide rod 303 on the flat plate 301 or the intermediate body 302;

[0061] By using the distance measuring unit to detect the tilt direction and tilt distance of the guide rod 303, the eccentricity direction and eccentricity distance of the tool bar 100 can be determined. Based on the mass of the tool bar 100, the various parameters of the dynamic balance of the tool bar 100 can be determined, which facilitates the subsequent use of methods such as adding counterweights or drilling to reduce weight to achieve a balanced state of the tool bar 100.

[0062] Using the above method, not only can the dynamic balance of the tool rod 100 be detected, but also the specific unqualified parameters of the tool rod 100 can be measured; in some embodiments, the eccentricity parameter can also be determined based on the distance detected by the laser rangefinder 304 and the distance measuring unit's judgment on the tilt direction of the guide rod 303.

[0063] Based on the above implementation, Figure 3 As shown, the distance measuring unit includes a support plate 313 provided on the flat plate 301 or the intermediate body 302. The support plate 313 is located outside a guide rod 303, and an electrode ring 315 is provided on the guide rod 303. Two electrode plates 314 are provided on the support plate 313 for use with the electrode ring 315, and the two electrode plates 314 are separated from each other.

[0064] In the present invention, the support plate 313 is mainly used to support the two electrode plates 314. The two electrode plates 314 can form a capacitor structure with the electrode ring 315. Then, by using the change in the capacitance value of the two capacitor structures when the guide rod 303 is tilted, the distance between the electrode ring 315 and the two electrode plates 314 can be reversely deduced. Using these two distance values, the position of the guide rod 303 after tilting, that is, the eccentric distance and eccentric direction of the knife rod 100, can be calculated.

[0065] It should be noted that, since capacitance is generated between the electrode plate 314 and the electrode ring 315 , conventional structures such as a power supply, a capacitance detector, a display, and a controller need to be configured externally for the distance measurement structure.

[0066] In some embodiments of the present invention, Figures 5 to 7 As shown, the clamping structure 200 includes a support cylinder 201 installed at the bottom of the corresponding flat plate 301, and a plurality of clamping portions 202 are provided in the support cylinder 201, and the plurality of clamping portions 202 are distributed circumferentially around the support cylinder 201;

[0067] The clamping portion 202 includes two mutually meshing tooth columns 203, each tooth column 203 is provided with an inclined arm 204, and the two inclined arms 204 are inclined in opposite directions, and each inclined arm 204 is provided with an electromagnetic suction plate 205;

[0068] The two tooth columns 203 are elastically connected via an elastic body 206;

[0069] It should be noted that the support cylinder 201 is mainly used to provide a support position for the plurality of clamping parts 202. The two tooth columns 203 are meshed with each other, so that when one tooth column 203 rotates, the other tooth column 203 rotates synchronously in the opposite direction, thereby causing the two oblique arms 204 to move synchronously relative to each other. The oblique arms 204 can push the electromagnetic suction plate 205 to adhere to the outer wall of the knife rod 100. Then, the electromagnetic suction plate 205 is energized, so that the electromagnetic suction plate 205 is adsorbed on the knife rod 100, thereby achieving the tightening of the knife rod 100. Since the two tooth columns 203 move synchronously, the two electromagnetic suction plates 205 can squeeze and fix the knife rod 100 at the same time, thereby ensuring that the knife rod 100 is vertical.

[0070] Since the two oblique arms 204 are inclined in opposite directions, when the knife rod 100 tends to move upward, the lower oblique arm 204 will move toward the outer wall of the knife rod 100 due to the friction between the corresponding electromagnetic suction plate 205 and the knife rod 100, thereby achieving a more secure squeezing effect on the knife rod 100; when the knife rod 100 tends to move downward, the upper oblique arm 204 will provide a more secure squeezing effect on the knife rod 100, thereby improving the firmness of the knife rod 100;

[0071] When the electromagnetic suction plate 205 is powered off, the elastic force of the elastic body 206 is required to ensure that the electromagnetic suction plate 205 returns to its natural state.

[0072] Based on the above implementation, Figures 5 and 6 As shown, the clamping structure 200 further includes a synchronization ring 207 coaxially arranged with the support cylinder 201, and a plurality of slide posts 209 are provided on the synchronization ring 207. The slide posts 209 slide on the support cylinder 201 along the axis direction of the support cylinder 201;

[0073] The synchronizer ring 207 is rotatably connected to one of the oblique arms 204 in each clamping portion 202 via a connecting arm 208;

[0074] The synchronizer ring 207 is connected to the upper or lower inclined arms 204 in each clamping part 202. When one inclined arm 204 moves, it will push the synchronizer ring 207 to move in the vertical direction through the connecting arm 208. The synchronizer ring 207 will drive the sliding column 209 to slide on the supporting cylinder 201. At the same time, the synchronizer ring 207 drives the corresponding inclined arms 204 to move through the remaining connecting arms 208, so that the clamping parts 202 are all in motion, realizing the synchronous movement process of the clamping parts 202 and realizing the fixed axis work of the tool rod 100.

[0075] Based on the above implementation, Figures 7 and 8As shown, the electromagnetic suction plate 205 rotates on the oblique 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;

[0076] The electromagnetic suction plate 205 has a plurality of through slots 210 formed along its length. The length of the through slots 210 is perpendicular to the length of the electromagnetic suction plate 205. One end of the through slots 210 extends through the side wall of the electromagnetic suction plate 205, and adjacent through slots 210 extend in opposite directions.

[0077] In the present invention, the rotational arrangement of the electromagnetic suction plate 205 and the limitation of the center of gravity of the electromagnetic suction plate 205 ensure that the electromagnetic suction plate 205 is vertical in a natural state, thereby enabling the electromagnetic suction plate 205 to accurately fit the outer wall of the tool rod 100, thereby preventing the electromagnetic suction plate 205 from tilting relative to the tool rod 100 when clamping tool rods 100 of different diameters.

[0078] The arrangement of the plurality of through slots 210 on the electromagnetic suction plate 205 allows the electromagnetic suction plate 205 to deform to a certain extent, thereby facilitating its contact with the tool rods 100 of different diameters and achieving a surface contact effect. In order to improve the strength of the electromagnetic suction plate 205 during deformation and prevent it from breaking, the through slots 210 can be formed by a combination of a narrow opening 211, a long opening 212, and an arc-shaped wide opening 213, such as Figure 8 As shown, the diameter of the arc-shaped wide opening 213 is the largest. In this way, the electromagnetic suction plate 205 is less likely to tear when deformed. In addition, the provision of the narrow opening 211 can reduce the opening of the through-slot 210, thereby correspondingly increasing the area of ​​the adjacent arc-shaped wide opening 213, making it easier to protect the deformed position of the arc-shaped wide opening 213 and improving the overall strength of the electromagnetic suction plate 205.

[0079] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A dynamic balance detection device for a spindle with a long rod structure, characterized in that: It comprises a clamping structure for clamping a 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 to the measuring structure and the tool bar; The measuring structure includes two upper and lower plates and an intermediate body located between the two plates. A plurality of mutually parallel guide rods are connected between the two plates, and each of the guide rods passes through the intermediate body. The intermediate body and the plurality of guide rods are used to guide the two plates so that they can perform relative translational motion in any horizontal direction. One of the plates is connected to the power structure, and the other plate is connected to the clamping structure. Wherein, a laser rangefinder is provided between the intermediate body and one of the flat plates for detecting the distance therebetween; 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 vertical thrust to the knife rod; The push-pull unit includes a first electromagnetic disk and a second electromagnetic disk that have an acting force on each other, the acting force being an attractive force or a repulsive force, the first electromagnetic disk being arranged on the intermediate body, and the second electromagnetic disk being arranged on one of the flat plates; An outer ring is provided on the outer side of the second electromagnetic disk, and the outer ring is fixed on the corresponding flat plate. A circular groove is provided on the inner wall of the outer ring, and an inner disk is provided in the circular groove. A plurality of rolling bodies are rotatably provided on the upper and lower surfaces of the inner disk, and the inner disk moves in the circular groove by the plurality of rolling bodies. Wherein, a plurality of curved arm structures are provided between the first electromagnetic magnetic disk and the second electromagnetic magnetic disk, and the plurality of curved arm structures are used to align the first electromagnetic magnetic disk and the second electromagnetic magnetic disk in a vertical direction; The measuring structure further includes a distance measuring unit, which is used to measure the tilt direction and tilt distance of the guide rod on the flat plate or the intermediate body; The ranging unit includes a support plate arranged on the flat plate or the intermediate body, the support plate is located on the outside of one of the guide rods, and the guide rod is provided with an electrode ring, and the support plate is provided with two electrode plates used in conjunction with the electrode ring, and the two electrode plates are separated from each other.

2. A dynamic balance detection device for a spindle with a long rod structure according to claim 1, characterized in that: The magnitude of the acting force between the first electromagnetic magnetic disk and the second electromagnetic magnetic disk can be adjusted.

3. The dynamic balance detection device for a spindle with a long rod structure according to claim 1, characterized in that: The clamping structure includes a supporting cylinder installed at the bottom of the corresponding flat plate, and a plurality of clamping parts are provided in the supporting cylinder, and the plurality of clamping parts are distributed circumferentially around the supporting cylinder; The clamping portion includes two mutually meshing tooth columns, each of which is provided with an oblique arm, and the two oblique arms are inclined in opposite directions, and each oblique arm is provided with an electromagnetic suction plate; The two tooth columns are elastically connected via an elastic body.

4. The dynamic balance detection device for a spindle with a long rod structure according to claim 3, characterized in that: The clamping structure further includes a synchronization ring coaxially arranged with the support cylinder, and a plurality of slide posts are arranged on the synchronization ring, and the slide posts slide on the support cylinder along the axis direction of the support cylinder; The synchronizer ring is rotatably connected to one of the oblique arms in each of the clamping parts via a connecting arm.

5. The dynamic balance detection device for a spindle with a long rod structure according to claim 4, 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; The electromagnetic suction plate is provided with a plurality of through slots along its length direction, and the length direction of the through slots is perpendicular to the length direction of the electromagnetic suction plate. One end of the through slots penetrates the side wall of the electromagnetic suction plate, and the penetration directions of two adjacent through slots are opposite.

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