Boring machine spindle straightness detection device and detection method

Abstract

The present invention relates to the technical field of detection structures, and in particular to a boring machine spindle straightness detection device and detection method, comprising a detection unit for detecting the straightness of the spindle and two groups of clamping units for clamping both ends of the spindle; wherein the detection unit comprises: a crossbeam; a conductive plate, which is installed on the crossbeam and is used to contact the spindle, so that the spindle is charged and forms an electrode in a capacitor; by forming a capacitor with the spindle and the charged plate, the straightness of the spindle is detected by utilizing the change in electric field strength. This method has low requirements for the detection position of the electric field detector, avoids data inaccuracy caused by measurement position deviation, and utilizes the electric field detector to be sensitive to small changes, so as to provide more accurate measurement results.

Description

Technical Field

[0001] The present invention relates to the technical field of detection structures, and in particular to a device and method for detecting the straightness of a boring machine spindle. Background Art

[0002] A boring machine is a machine tool used for precision hole machining in workpieces and is widely used in fields such as machinery manufacturing, the automotive industry, aerospace, and mold manufacturing. It is capable of high-precision machining of internal cylindrical surfaces, end faces, and other complex-shaped surfaces. During the boring process, the boring cutter moves along the axis of the workpiece or a specific path to remove material and form the desired geometric shape. The boring machine mandrel is one of the key components of the boring machine. Its function is to support and rotate the boring cutter to ensure that the boring cutter cuts along the predetermined trajectory. The straightness of the mandrel is directly related to the machining accuracy and affects the quality of the machined parts. If the mandrel is bent or deflected, it will cause the machined hole to have ovality, taper, or irregular shapes, which will affect the assembly accuracy and the final performance of the product.

[0003] To ensure machining quality, the straightness of the boring machine spindle must be checked. Straightness refers to the degree to which the spindle maintains a perfectly straight line throughout its entire length. Any deviation from this ideal line is considered an error. Accurate straightness testing can promptly identify and correct potential spindle problems, such as wear, deformation, or improper installation, thereby improving machining efficiency, reducing scrap, and extending the life of the equipment.

[0004] Traditional spindle straightness detection usually relies on laser distance measurement. By moving the laser distance meter along the axis of the spindle, the distance between the distance meter and different positions on the outer surface of the spindle is detected. The floating range is calculated by measuring the distance to determine whether the spindle straightness is qualified. This detection method requires the distance meter to be able to move accurately along the axis of the spindle, and its detection conditions are relatively harsh. In actual applications, the movement of the distance meter often produces deviations in different directions. The data measured based on the deviation is inaccurate, resulting in low detection accuracy. In addition, its operation is cumbersome and not easy to popularize and use. Summary of the Invention

[0005] In view of the above technical problems, the present invention provides a boring machine spindle straightness detection device and detection method, the specific technical solution adopted is:

[0006] According to a first aspect of the present invention, there is provided a boring machine spindle straightness detection device, comprising a detection unit for detecting the straightness of the spindle and two sets of clamping units for clamping both ends of the spindle;

[0007] Wherein, the detection unit includes:

[0008] beam;

[0009] a conductive sheet mounted on the crossbeam and adapted to contact the mandrel, thereby electrifying the mandrel and forming an electrode in the capacitor;

[0010] A charged plate is mounted on the crossbeam, the charged plate is parallel to the core shaft, and the charged plate is used in conjunction with the core shaft as another electrode in the capacitor. The charged plate is composed of a plurality of capacitor plates arranged in a straight line, and the capacitor plates slide on the crossbeam;

[0011] The electric field detector is used to detect the electric field strength between the capacitor plate and the core shaft.

[0012] In some embodiments of the present invention, the detection unit further includes:

[0013] a first motor, mounted on the crossbeam;

[0014] A first threaded rod, transmission-mounted on an output end of the first motor;

[0015] The movable seat is slidably mounted on the cross beam along the length direction of the cross beam. The first threaded rod passes through the movable seat and is threadedly connected to each other. The electric field detector is fixed on the movable seat.

[0016] In some embodiments of the present invention, the detection unit also includes two transmission wheels, which are distributed along the length direction of the beam and are both rotatably installed on the beam. A plurality of circular steps are arranged on the outer wall of the transmission wheel from top to bottom, and the radius of the plurality of steps increases successively. The plurality of steps on the two transmission wheels correspond one to one, and the corresponding two steps are connected through a transmission belt. The plurality of capacitor plates are divided into two groups, each group is connected to a plurality of transmission belts. When the transmission wheel rotates, the positions of the plurality of capacitor plates are adjusted at equal intervals, and a second motor for providing power to a transmission wheel is provided on the beam.

[0017] In some embodiments of the present invention, each capacitor plate is provided with a contact block, the movable seat is provided with a support sleeve, a contact column is slidably inserted into the support sleeve, and the support sleeve and the contact column are connected by an insulating spring.

[0018] In some embodiments of the present invention, the clamping unit comprises:

[0019] Fixed plate;

[0020] A top column is coaxial with the fixed plate and is slidably inserted into the fixed plate;

[0021] A plurality of side clamping arms are distributed in a ring shape on the end surface of the fixed disk around the axis of the fixed disk, and the side clamping arms slide on the fixed disk along the radial direction of the fixed disk. The side clamping arms are connected to the top column through a pull rod.

[0022] In some embodiments of the present invention, the detection unit further includes a ring rotatably mounted on a fixed disk, the two ends of the beam are fixedly connected to the rings on the two fixed disks, and one of the fixed disks is provided with a third motor for providing power for the rotation of the ring.

[0023] In some embodiments of the present invention, each of the side clamping arms is provided with a mounting seat, and two support plates are rotatably provided on the mounting seat, the two support plates are inclined relative to each other, and the two support plates are connected by an elastic insulating clip;

[0024] Wherein, the mounting seat slides on the side clamping arm along the axis direction of the fixed disk, and the mounting seat and the side clamping arm are connected via a first spring;

[0025] A second spring and a movable sleeve are sleeved on the outer wall of the top column. The second spring connects the movable sleeve and the top column. The pull rod is rotatably mounted on the movable sleeve.

[0026] In some embodiments of the present invention, the clamping unit further comprises:

[0027] a machine base, on which the fixing plate is fixed;

[0028] The cylinder is fixedly installed on the machine base;

[0029] A tooth plate is slidably mounted on the machine base, and the output end of the cylinder is connected to the tooth plate;

[0030] The gear column is rotatably mounted on the machine base, and the gear column is meshed with the gear plate;

[0031] Two second threaded rods are respectively installed at both ends of the gear column, and the threads of the two second threaded rods are opposite to each other. A threaded sleeve is screwed on each second threaded rod, and the threaded sleeve is fixedly connected to the top column on the fixed plate through a connecting plate.

[0032] According to a second aspect of the present invention, a method for detecting the straightness of a boring machine spindle is provided, comprising the following steps:

[0033] According to the length of the core shaft, multiple capacitor plates on the charged plate are adjusted to corresponding positions;

[0034] The two ends of the mandrel are clamped and fixed by two sets of clamping units, and the mandrel is parallel to the charged plate on the beam;

[0035] The outer wall of the core shaft is in contact with the conductive sheet, so that the power supply can energize the core shaft through the conductive sheet;

[0036] The power supply supplies power to the multiple capacitor plates on the charged plate, so that a stable electric field is formed between the capacitor plates and the core shaft;

[0037] Use an electric field detector to detect the electric field strength between each capacitor plate and the core shaft, and compare the detected electric field strength with the specified value to determine whether the core shaft straightness meets the requirements.

[0038] In some embodiments of the present invention, the electric field detector is an electrometer, a voltmeter, or an electric field probe.

[0039] The beneficial effects of the present invention are:

[0040] By forming a capacitor with the core shaft and the charged plate, the straightness of the core shaft is detected by using the change in electric field strength. This method has low requirements for the detection position of the electric field detector, avoiding inaccurate data caused by measurement position deviation, and using the electric field detector to be sensitive to small changes, it can provide more accurate measurement results. Since the detection of electric field strength is less affected by the detection position and more affected by the shape of the core shaft as an electrode, this method has better anti-interference performance, reduces the influence of external factors on the detection results, and improves detection accuracy. Compared with traditional detection methods, capacitive detection does not require precise mechanical moving devices to ensure the accuracy of the detection position, which makes the operation simpler and easier to popularize and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] 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.

[0042] Figure 1 It is a structural schematic diagram of the present invention;

[0043] Figure 2 is a schematic structural diagram of a detection unit in an embodiment of the present invention;

[0044] Figure 3 yes Figure 2 Structural diagram from another perspective;

[0045] Figure 4 2 is a schematic structural diagram of a transmission wheel in an embodiment of the present invention;

[0046] Figure 5 1 is a schematic structural diagram of an electric field detector according to an embodiment of the present invention;

[0047] Figure 6 is a structural schematic diagram of a clamping unit in an embodiment of the present invention;

[0048] Figure 7 2 is a schematic structural diagram of a side clamping arm in an embodiment of the present invention.

[0049] Reference numerals:

[0050] 100, mandrel;

[0051] 200, detection unit; 201, crossbeam; 202, conductive sheet; 203, capacitor plate; 204, electric field detector; 205, first motor; 206, first threaded rod; 207, movable base; 208, transmission wheel; 209, transmission belt; 210, second motor; 211, contact block; 212, support sleeve; 213, contact post; 214, insulating spring; 215, collar; 216, third motor;

[0052] 300, clamping unit; 301, fixed plate; 302, top column; 303, side clamping arm; 304, pull rod; 305, mounting base; 306, support plate; 307, elastic insulating clip; 308, first spring; 309, machine base; 310, cylinder; 311, tooth plate; 312, tooth column; 313, second threaded rod; 314, threaded sleeve; 315, connecting plate; 316, second spring; 317, movable sleeve. DETAILED DESCRIPTION

[0053] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0054] like Figures 1 to 3 As shown, a boring machine spindle straightness detection device of the present invention includes a detection unit 200 for detecting the straightness of the spindle 100 and two sets of clamping units 300 for clamping both ends of the spindle 100;

[0055] The detection unit 200 includes:

[0056] beam 201;

[0057] The conductive sheet 202 is mounted on the crossbeam 201 and is used to contact the core shaft 100 to charge the core shaft 100 and form an electrode in the capacitor;

[0058] A charged plate is mounted on the crossbeam 201 and is parallel to the core shaft 100. The charged plate is used in conjunction with the core shaft 100 as another electrode in the capacitor. The charged plate is composed of multiple capacitor plates 203 arranged in a straight line. The capacitor plates 203 slide on the crossbeam 201.

[0059] An electric field detector 204 is used to detect the electric field strength between the capacitor plate 203 and the core shaft 100;

[0060] Since the core shaft 100 and the charged plate form a capacitor, a stable electric field will be generated between them. When the electric field detector 204 detects the electric field, the detection position of the electric field detector 204 has little effect on the electric field strength. In this way, the requirements for the detection position of the electric field detector 204 are reduced, thereby avoiding the inability to accurately detect the core shaft 100 due to high requirements for the detection position of the electric field detector 204. While ensuring the detection accuracy, the detection requirements are reduced and the detection anti-interference performance is improved. When the core shaft 100 is bent or there is an uneven position on the surface, the core shaft 100 acts as an electrode, which will directly affect the electric field strength. At this time, the electric field detected by the electric field detector 204 The intensity changes, and thus this method can achieve rapid and accurate detection of the core shaft 100, reduce the generation of error factors, and reduce the influence of error factors on the detection results; the conductive sheet 202 and the charged plate are respectively connected to the two poles of a power supply; by using multiple capacitor plates 203 to form the charged plate, and allowing the capacitor plates 203 to move on the beam 201, the coverage range of the charged plate can be adjusted, so that core shafts 100 of different lengths can be detected; during detection, each capacitor plate 203 will form a stable electric field with the core shaft 100, and the electric field detector 204 can detect the electric field between the capacitor plates 203 at different positions and the core shaft 100;

[0061] Since the plurality of capacitor plates 203 all carry the same charge, the charges between two adjacent capacitor plates 203 will interfere with each other. To prevent the interference from affecting the electric field strength, a partition for isolating the charges can be provided on the side wall of each capacitor plate 203. Of course, if the charge interference between two adjacent capacitor plates 203 is stable, the interference will not affect the detection work and the phenomenon can be left untreated. In actual use, since the straightness of the mandrel 100 needs to be determined by using the electric field strength detected by the electric field detector 204, a plurality of standard sample mandrels 100 can be used for preliminary testing, and the standard electric field strength can be determined based on the test results. In this way, during the formal test, when the detected electric field strength exceeds the standard electric field strength, the straightness of the mandrel 100 is deemed unqualified.

[0062] By forming a capacitor with the core shaft 100 and the charged plate, the straightness of the core shaft 100 is detected by utilizing the change in electric field strength. This method has low requirements for the detection position of the electric field detector 204, avoids inaccurate data caused by measurement position deviation, and utilizes the electric field detector 204 to be sensitive to small changes, which can provide more accurate measurement results. Since the detection of electric field strength is less affected by the detection position and more affected by the shape of the core shaft 100 as an electrode, this method has better anti-interference performance, reduces the influence of external factors on the detection results, and improves detection accuracy. Compared with traditional detection methods, capacitive detection does not require precise mechanical moving devices to ensure the accuracy of the detection position, which makes the operation simpler and easier to popularize and use.

[0063] like Figure 3 and Figure 5 As shown, the detection unit 200 further includes:

[0064] A first motor 205 is mounted on the crossbeam 201;

[0065] A first threaded rod 206 is transmission-mounted on the output end of the first motor 205;

[0066] The movable base 207 is slidably mounted on the crossbeam 201 along the length direction of the crossbeam 201. The first threaded rod 206 passes through the movable base 207 and is threadedly connected to each other. The electric field detector 204 is fixed on the movable base 207.

[0067] The movable seat 207 provides an installation position for the electric field detector 204. Since the electric field detector 204 needs to detect the electric field around the capacitor plates 203 at different positions, the electric field detector 204 needs to move along the length direction of the beam 201. The first motor 205 can push the movable seat 207 to move through the first threaded rod 206, and the movable seat 207 drives the electric field detector 204 to move. In order to avoid interference with the detection work caused by the above structure, an area or partition that can block the electric field can be established between the above structure and the beam 201.

[0068] During detection, if the distances between two adjacent capacitor plates 203 are not equal, since the multiple capacitor plates 203 all carry the same charge, the interference between the two adjacent capacitor plates 203 will affect the detection structure. Therefore, the multiple capacitor plates 203 need to be evenly distributed on the beam 201. Figures 2 to 4As shown, the detection unit 200 also includes two transmission wheels 208, which are distributed along the length direction of the beam 201 and are both rotatably mounted on the beam 201. A plurality of circular steps are sequentially arranged on the outer wall of the transmission wheel 208 from top to bottom, and the radius of the plurality of steps increases sequentially. The plurality of steps on the two transmission wheels 208 correspond to each other one by one, and the corresponding two steps are connected through a transmission belt 209. The plurality of capacitor plates 203 are divided into two groups, each group is connected to a plurality of transmission belts 209. When the transmission wheel 208 rotates, the positions of the plurality of capacitor plates 203 are adjusted at equal intervals. A second motor 210 for providing power to one transmission wheel 208 is provided on the beam 201; the plurality of capacitor plates 203 are divided into two groups, one group is connected to the plurality of transmission belts 209 on one side of the axis of the transmission wheel 208, and the other group is connected to the plurality of transmission belts 209 on the other side of the axis of the transmission wheel 208, that is, each transmission belt 209 is connected to two capacitor plates 203, and The positions of the two capacitor plates 203 are symmetrically distributed on the left and right sides of the midpoint of the beam 201. In this way, when the transmission belt 209 rotates, the two capacitor plates 203 on the transmission belt 209 will move closer or farther away synchronously. Since multiple transmission belts 209 are synchronously driven through multiple steps on the transmission wheel 208, multiple capacitor plates 203 will be adjusted at equal intervals. In this way, the electronic interference between two adjacent capacitor plates 203 is consistent, so that the interference will not affect the detection of the electric field detector 204, thereby improving the detection accuracy. The second motor 210 provides power for the movement of the transmission wheel 208 and the transmission belt 209.

[0069] like Figure 5 As shown, each capacitor plate 203 is provided with a contact block 211, and a support sleeve 212 is provided on the movable seat 207. A contact column 213 is slidably inserted on the support sleeve 212. The support sleeve 212 and the contact column 213 are connected by an insulating spring 214. When the contact column 213 contacts the end face of the contact block 211, the electric field detector 204 is energized and measures the electric field between the capacitor plate 203 and the core shaft 100. In this way, when the electric field detector 204 moves between two adjacent capacitor plates 203, the electric field detector 204 will not be affected by the position. The electric field is measured because the electric field at this position is unstable, so this method can reduce electric field interference. The electric field detector 204 only measures the electric field at the corresponding position of the capacitor plate 203. Specifically, multiple contact blocks 211 are connected to the same power supply, and the power supply is not shared with the power supply on the capacitor plate 203. The end face of the contact block 211 facing the contact column 213 is set to be conical, so that the contact column 213 can be in smooth contact with the contact block 211, and the use of the insulating spring piece 214 can make the contact between the contact column 213 and the contact block 211 closer.

[0070] When the clamping unit 300 clamps the mandrel 100, in order to improve the clamping effect and positioning accuracy of the mandrel 100, the following methods can be used: Figure 6In the manner shown, the clamping unit 300 includes:

[0071] Fixed plate 301;

[0072] The top column 302 is coaxial with the fixed plate 301 and slidably inserted into the fixed plate 301;

[0073] Multiple side clamping arms 303 are distributed in an annular manner on the end surface of the fixed disk 301 around the axis of the fixed disk 301, and the side clamping arms 303 slide on the fixed disk 301 in the radial direction of the fixed disk 301. The side clamping arms 303 are connected to the top column 302 via a pull rod 304;

[0074] The end of the top column 302 is used to press the end face of the core shaft 100, and multiple side clamping arms 303 are used to simultaneously clamp and fix the core shafts 100 between them. Specifically, the fixed plate 301 can support the structure thereon. When the top column 302 moves toward the end face of the core shaft 100 between the two sets of clamping units 300, the top column 302 will use multiple pull rods 304 to pull the multiple side clamping arms 303 closer to each other, and the multiple side clamping arms 303 will clamp and fix the outer wall of the core shaft 100 between them. Since the multiple side clamping arms 303 move synchronously, the fixed axis fixing effect of the core shaft 100 can be achieved, and the top column 302 can contact the end face of the core shaft 100. Therefore, the top column 302 on the two sets of clamping units 300 can be used to squeeze and fix the core shaft 100 in the horizontal direction.

[0075] In order to conduct a comprehensive inspection of the outer wall of the core shaft 100, Figure 6 As shown, the detection unit 200 also includes a ring 215 rotatably mounted on the fixed disk 301, and both ends of the beam 201 are fixedly connected to the rings 215 on the two fixed disks 301. One of the fixed disks 301 is provided with a third motor 216 for providing power for the rotation of the ring 215. When the third motor 216 drives the ring 215 to rotate, the ring 215 drives the beam 201 to perform a circular motion around the core shaft 100, thereby adjusting the structure on the beam 201 to different angles to detect different positions of the outer wall of the core shaft 100.

[0076] like Figure 7As shown, each side clamping arm 303 is provided with a mounting seat 305, and two support plates 306 are rotatably provided on the mounting seat 305. The two support plates 306 are relatively inclined, and the two support plates 306 are connected by an elastic insulating clip 307; when the side clamping arm 303 squeezes the outer wall of the core shaft 100, the elastic insulating clip 307 contacts the outer wall of the core shaft 100, and as the side clamping arm 303 is squeezed, the elastic insulating clip 307 will deform and stick to the outer wall of the core shaft 100, thereby realizing surface contact extrusion of the core shaft 100, increasing the contact area, and facilitating the protection of the core shaft 100, and because the elastic insulating clip 307 can be elastically deformed, it can be applicable to core shafts 100 of different diameters, and when the elastic insulating clip 307 is deformed, the support plate 306 will rotate on the mounting seat 305.

[0077] Further, such as Figure 7 As shown, the mounting seat 305 slides on the side clamping arm 303 along the axis direction of the fixed disk 301, and the mounting seat 305 and the side clamping arm 303 are connected by a first spring 308. After the side clamping arm 303 completes clamping the core shaft 100, the end of the top column 302 also needs to press and fix the core shaft 100. At this time, if the core shaft 100 and the side clamping arm 303 cannot move relative to each other, then the squeezing of the core shaft 100 by the top column 302 will cause relative wear between the core shaft 100 and the elastic insulating clip 307 on the side clamping arm 303. To avoid this phenomenon, the core shaft 100 can be allowed to move laterally by enabling the mounting seat 305 to move on the side clamping arm 303, and the first spring 308 is provided to ensure that the mounting seat 305 is reset.

[0078] Since the side clamping arms 303 and the top column 302 can clamp the core shaft 100 in sequence, but cannot achieve synchronous instantaneous clamping, other structures need to be set on the fixed plate 301 to control the sequence timing, such as Figure 6 As shown, a second spring 316 and a movable sleeve 317 are provided on the outer wall of the top column 302, the second spring 316 connects the movable sleeve 317 and the top column 302, and the pull rod 304 is rotatably installed on the movable sleeve 317. The second spring 316 is used to generate an elastic pulling force on the movable sleeve 317. When the side clamping arm 303 completes the clamping work of the core shaft 100, the side clamping arm 303, the pull rod 304 and the movable sleeve 317 stop moving. At this time, the top column 302 will continue to move and pull the second spring 316 to undergo elastic deformation until the top column 302 completes the clamping work of the core shaft 100. In this way, the movement of the top column 302 can realize the side clamping arm 303 and the top column 302 clamping the core shaft 100 in sequence.

[0079] like Figure 1 As shown, the clamping unit 300 further includes:

[0080] A machine base 309, on which the fixed plate 301 is fixed;

[0081] Cylinder 310, fixedly mounted on the base 309;

[0082] The tooth plate 311 is slidably mounted on the base 309, and the output end of the cylinder 310 is connected to the tooth plate 311;

[0083] The tooth column 312 is rotatably mounted on the machine base 309 and is meshed with the tooth plate 311;

[0084] Two second threaded rods 313 are respectively mounted on the two ends of the tooth column 312, and the threads of the two second threaded rods 313 are rotated in opposite directions. A threaded sleeve 314 is screwed onto each second threaded rod 313, and the threaded sleeve 314 is fixedly connected to the top column 302 on the fixed plate 301 via a connecting plate 315;

[0085] The machine base 309 is used to support the structure above it. When the cylinder 310 is extended or retracted, it will push the gear column 312 to rotate through the gear plate 311. The gear column 312 drives the two second threaded rods 313 to rotate synchronously. Since the threads of the two second threaded rods 313 are in opposite directions, the two threaded sleeves 314 will move in opposite directions synchronously. The two threaded sleeves 314 will drive the two top columns 302 to move in opposite directions synchronously through the two connecting plates 315, thereby providing power for the clamping unit 300 to clamp or release the core shaft 100.

[0086] A detection method for a boring machine spindle straightness detection device of the present invention comprises the following steps:

[0087] According to the length of the core shaft 100, the multiple capacitor plates 203 on the charged plate are adjusted to corresponding positions;

[0088] The two ends of the core shaft 100 are clamped and fixed by two sets of clamping units 300, and the core shaft 100 is parallel to the charged plate on the beam 201;

[0089] The outer wall of the core shaft 100 is in contact with the conductive sheet 202 , so that the power source can energize the core shaft 100 through the conductive sheet 202 ;

[0090] The power supply supplies power to the plurality of capacitor plates 203 on the charged plate, so that a stable electric field is formed between the capacitor plates 203 and the core shaft 100;

[0091] The electric field intensity between each capacitor plate 203 and the core shaft 100 is detected by using the electric field detector 204, and the detected electric field intensity is compared with the specified value to determine whether the straightness of the core shaft 100 meets the requirements.

[0092] This method of using the electric field strength within the capacitor to detect the core shaft 100 can reduce the influence of the detection position on the detection result, thereby improving the anti-interference effect, simplifying the detection method, and improving the detection accuracy. According to actual conditions, the electric field detector 204 can be an electrometer, a voltmeter, an electric field probe, etc., and its interference effect is as follows:

[0093] High impedance electrometer, interference level: low;

[0094] Reason: An electrometer usually has a probe that has some capacitance, which may change the distribution of the local electric field.

[0095] High impedance voltmeter, interference level: low;

[0096] Reason: The voltmeter indirectly calculates the electric field strength by measuring the voltage between the two plates and does not directly interfere with the electric field. However, this structure cannot achieve non-contact detection and its application is relatively limited.

[0097] Optical electric field probe, interference level: low;

[0098] Reason: The electric field probe usually has a metal probe, and the presence of the probe may change the distribution of the local electric field, thereby producing a smaller interference effect.

[0099] Of course, the degree of interference of the electric field by the electric field detector 204 may also be used as a basic detection parameter to further optimize the detection accuracy.

[0100] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A boring machine spindle straightness detection device, characterized in that: It includes a detection unit for detecting the straightness of the core shaft and two sets of clamping units for clamping the two ends of the core shaft; Wherein, the detection unit includes: beam; a conductive sheet mounted on the crossbeam and adapted to contact the mandrel, thereby electrifying the mandrel and forming an electrode in the capacitor; A charged plate is mounted on the crossbeam, the charged plate is parallel to the core shaft, and the charged plate is used in conjunction with the core shaft as another electrode in the capacitor. The charged plate is composed of a plurality of capacitor plates arranged in a straight line, and the capacitor plates slide on the crossbeam; An electric field detector is used to detect the electric field strength between the capacitor plate and the core shaft; The detection unit also includes: a first motor, mounted on the crossbeam; A first threaded rod, transmission-mounted on an output end of the first motor; The movable seat is slidably mounted on the crossbeam along the length direction of the crossbeam, the first threaded rod passes through the movable seat and is threadedly connected to each other, and the electric field detector is fixed on the movable seat; The detection unit also includes two transmission wheels, which are distributed along the length of the beam and are both rotatably mounted on the beam. The outer walls of the transmission wheels are sequentially provided with a plurality of circular steps from top to bottom, with the radii of the plurality of steps increasing in sequence. The plurality of steps on the two transmission wheels correspond to each other one by one, and the corresponding two steps are connected by a transmission belt. The plurality of capacitor plates are divided into two groups, each group is connected to the plurality of transmission belts. When the transmission wheels rotate, the positions of the plurality of capacitor plates are adjusted at equal intervals. The beam is provided with a second motor for providing power to one of the transmission wheels. Each of the capacitor plates is provided with a contact block, the movable seat is provided with a support sleeve, a contact column is slidably inserted into the support sleeve, and the support sleeve and the contact column are connected by an insulating spring sheet.

2. The boring machine spindle straightness detection device according to claim 1, characterized in that: The clamping unit comprises: Fixed plate; A top column is coaxial with the fixed plate and is slidably inserted into the fixed plate; A plurality of side clamping arms are distributed in a ring shape on the end surface of the fixed disk around the axis of the fixed disk, and the side clamping arms slide on the fixed disk along the radial direction of the fixed disk. The side clamping arms are connected to the top column through a pull rod.

3. The boring machine spindle straightness detection device according to claim 2, characterized in that: The detection unit also includes a ring rotatably mounted on a fixed disk. Both ends of the beam are fixedly connected to the rings on the two fixed disks. One of the fixed disks is provided with a third motor for providing power for the rotation of the ring.

4. The boring machine spindle straightness detection device according to claim 2, characterized in that: Each of the side clamping arms is provided with a mounting seat, on which two support plates are rotatably provided, the two support plates are inclined relative to each other, and the two support plates are connected by an elastic insulating clip; Wherein, the mounting seat slides on the side clamping arm along the axis direction of the fixed disk, and the mounting seat and the side clamping arm are connected via a first spring; A second spring and a movable sleeve are sleeved on the outer wall of the top column. The second spring connects the movable sleeve and the top column. The pull rod is rotatably mounted on the movable sleeve.

5. The boring machine spindle straightness detection device according to claim 4, characterized in that: The clamping unit further comprises: a machine base, on which the fixing plate is fixed; The cylinder is fixedly installed on the machine base; A tooth plate is slidably mounted on the machine base, and the output end of the cylinder is connected to the tooth plate; The gear column is rotatably mounted on the machine base, and the gear column is meshed with the gear plate; Two second threaded rods are respectively installed at both ends of the gear column, and the threads of the two second threaded rods are opposite to each other. A threaded sleeve is screwed on each second threaded rod, and the threaded sleeve is fixedly connected to the top column on the fixed plate through a connecting plate.

6. The method for detecting the straightness of a boring machine spindle according to claim 1, wherein: The steps include: According to the length of the core shaft, multiple capacitor plates on the charged plate are adjusted to corresponding positions; The two ends of the mandrel are clamped and fixed by two sets of clamping units, and the mandrel is parallel to the charged plate on the beam; The outer wall of the core shaft is in contact with the conductive sheet, so that the power supply can energize the core shaft through the conductive sheet; The power supply supplies power to the multiple capacitor plates on the charged plate, so that a stable electric field is formed between the capacitor plates and the core shaft; Use an electric field detector to detect the electric field strength between each capacitor plate and the core shaft, and compare the detected electric field strength with the specified value to determine whether the core shaft straightness meets the requirements.

7. The boring machine spindle straightness detection device according to claim 1, characterized in that: The electric field detector adopts one of an electrometer, a voltmeter and an electric field probe.

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