Rotation speed test bench of motorized spindle and test system thereof

Abstract

The invention discloses a rotating speed testboard of an electric spindle and a test system thereof, the rotating speed testboard comprises a work testboard, the upper end of the work testboard is fixedly provided with a rotating speed torque measuring device, a data processing unit, an upper computer and a motor, the upper end of the work testboard is provided with two symmetrically arranged fixing assemblies, and the two fixing assemblies are fixedly provided with the electric spindle. One fixing assembly is in sliding connection with the working test board, the other fixing assembly is fixedly connected with the working test board, a fixing ring is fixed to the left end of the fixing assembly fixed to the working test board, and a detection assembly in sliding connection with the working test board is arranged at the left end of the fixing ring; the left end of the detection assembly is provided with an installation ring fixedly connected with the work test bench, the left end of the installation ring is rotatably connected with a coupler, and a plurality of guide rods penetrating through the sliding seat are fixed between the installation ring and the fixing ring. Whether the rotating end and the fixed end of the motorized spindle are concentric can be detected.

Description

Technical Field

[0001] The invention relates to the technical field of electric spindles, in particular to a rotation speed test bench and a test system of an electric spindle. Background Art

[0002] The electric spindle is a new technology that has emerged in the field of CNC machine tools, integrating the machine tool spindle with the spindle motor. The spindle is a set of components, which includes the electric spindle itself and its accessories: the electric spindle, high-frequency frequency conversion device, oil mist lubricator, cooling device, built-in encoder, tool changer, etc. This transmission structure form of "combining the spindle motor and the machine tool spindle into one" makes the spindle component relatively independent from the transmission system and overall structure of the machine tool, so it can be made into a "spindle unit", commonly known as "electric spindle", which has the characteristics of high speed, high precision, low noise, and the structure with a lock on the inner ring is more suitable for spray lubrication.

[0003] Chinese patent application number CN201820228025.0 discloses a non-contact electric spindle reliability test bench, including a base, on which are arranged in sequence an electric dynamometer assembly, a speed torque sensor assembly, a ceramic test rod, a magnetic ring, an electromagnet assembly, a non-contact electromagnetic exciter assembly and an electric spindle assembly, the electric dynamometer assembly includes an electric dynamometer, the output shaft of the electric dynamometer is connected to the speed torque sensor assembly, the speed torque sensor assembly includes a speed torque sensor and an elastic coupling, one end of the speed torque sensor is connected to the output shaft of the electric dynamometer, and the other end is connected to the elastic coupling, the elastic coupling is connected to one end of the ceramic test rod, a magnetic ring is set in the middle of the ceramic test rod, a non-contact electromagnetic exciter assembly is arranged on the front side of the magnetic ring, an electromagnet assembly is arranged on the rear side of the magnetic ring, and the other end of the ceramic test rod is connected to the electric spindle assembly. The electric dynamometer is used to realize torque loading, the non-contact exciter is used to realize radial loading, and the electromagnet is used to realize axial loading.

[0004] Chinese patent application No. 201820585797.X discloses a comprehensive performance test system for an electric spindle, comprising: a host computer, a frequency converter for driving the electric spindle under test, an electric spindle fixture mechanism for positioning the electric spindle under test, a vibration measuring device for measuring the axial vibration information of the core shaft of the electric spindle under test, and a speed torque measuring device for measuring the speed torque information of the electric spindle under test; the electric spindle fixture mechanism is also connected with a plurality of temperature sensors for collecting temperature information at different positions on the surface of the electric spindle under test, a plurality of sound level sensors for collecting noise information at different positions during the operation of the electric spindle under test, and a vibration sensor for collecting vibration information during the operation of the electric spindle under test; the host computer performs a comprehensive performance test on the electric spindle under test according to the information collected by each measuring device and sensor, thereby realizing automatic testing of the comprehensive performance of the electric spindle, with high testing efficiency and accurate and reliable test results; the structure is simple and the installation is convenient, and it can complete the testing of electric spindles of various specifications.

[0005] The following problems may occur during the use of the above solution: 1. When testing the electric spindle, the speed and torque information of the electric spindle are detected, but the concentricity of the rotating end and the fixed end of the electric spindle cannot be detected. During the use of the electric spindle, if the rotating end and the fixed end are not concentric, it will cause the motor to vibrate, affect the operation of the motor, and generate noise. At the same time, the internal friction of the non-concentric electric spindle increases, resulting in increased energy loss, thereby reducing the overall efficiency of the motor and shortening its service life.

[0006] 2. When connecting the electric spindle and the detection equipment, the above solutions are all connected through couplings or flanges. When the flange and the coupling are connected to the electric spindle, screws are usually used for connection. Due to the different diameters of the electric spindle, the depth of the screw engagement will also be different. When the electric spindle is rotated and tested, the dynamic balance of the electric spindle will be affected, resulting in deviations in the detection data. Summary of the invention

[0007] In view of the above problems, the present invention provides a speed test bench for an electric spindle and a test system thereof, which solve the above problems.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a speed test bench for an electric spindle and a test system thereof, comprising a working test bench, a speed torque measuring device, a data processing unit, a host computer and a motor are fixed on the upper end of the working test bench, two symmetrically arranged fixed components are provided on the upper end of the working test bench, an electric spindle is fixed on the two fixed components, the fixed components comprise a clamping plate, one of the fixed components is slidably connected to the working test bench, and the other fixed component is fixedly connected to the working test bench, a coupling is connected to the left end of the electric spindle, and the The left end of the coupling is connected to a speed and torque measuring device, and a clamping block is slidably connected to the inside of the clamping plate. A clamping rod is conveniently connected to one side of the clamping block for transmission. The clamping rod adopts an electric telescopic rod, and the outer wall of the fixed section of the clamping rod is provided with a thread. The clamping rod is connected to the clamping plate through the thread, and one end of the clamping rod is connected to the clamping block. The other end of the clamping rod is provided with a hexagonal countersunk hole, and a hexagonal rod is transmitted and slidably connected in the hexagonal countersunk hole. The hexagonal rod is transmission-connected to a servo motor, and the servo motor is fixedly connected to the clamping plate.

[0009] Preferably, a fixing ring is fixed to the left end of the fixing assembly fixed on the working test bench, a detection assembly slidably connected to the working test bench is provided at the left end of the fixing ring, a mounting ring fixedly connected to the working test bench is provided at the left end of the detection assembly, a coupling is rotatably connected to the left end of the mounting ring, a plurality of guide rods penetrating the slide seat are fixed between the mounting ring and the fixing ring, and the fixing assembly, the detection assembly, the mounting ring and the fixing ring are coaxially arranged; The detection assembly includes a slide seat, which is slidably connected to the working test bench, an ink supply ring is fixed to the upper end of the slide seat, a connecting ring is fixed to the inner side of the ink supply ring, a plurality of fixed cylinders are fixed to the inner side of the connecting ring along its circumference, a slide rod is slidably connected to the inside of the fixed cylinder via a spring, a distance sensor A is fixed to one end of the fixed cylinder close to the slide rod, a ball is rollingly connected to one end of the slide rod away from the distance sensor A, and a marking assembly fixedly connected to the slide rod is provided on the outer side of the ball; The marking component includes an inkjet chamber, which is connected to an ink supply ring. A plurality of nozzles are provided along the circumference of the lower end of the inkjet chamber. A plurality of sliding columns are fixed along the circumference of the interior of the inkjet chamber. A blocking ring is slidably connected to the sliding column. The upper end of the blocking ring is fixedly connected to the inkjet chamber via a compression spring. A plurality of plugs corresponding to the nozzles are fixed along the circumference of the lower end of the blocking ring. An electromagnet A is fixed to the upper end of the inkjet chamber.

[0010] Preferably, the interior of the fixed cylinder is hollow, the sliding rod is slidably connected inside the fixed cylinder, the lengths of the multiple sliding rods extended in the natural state are the same, the interiors of the fixed cylinder and the sliding rod are both provided with ink supply hoses, the two ends of the ink supply hoses are respectively connected to the ink supply ring and the inkjet chamber, the spray hole opened at the lower end of the inkjet chamber is in a ring shape to surround the ball therein, and contact sensors are fixed at both ends of the ink supply ring.

[0011] Preferably, a plurality of telescopic rods are fixed along the circumference of the inner wall of the mounting ring, and a distance measuring sensor B is fixed on each of the telescopic rods. The lengths of the telescopic rods extended in a static state are consistent. Two symmetrically arranged commutators are fixed to the lower end of the mounting ring, and the two commutators are respectively connected in transmission with a moving screw rod, the moving screw rod is rotationally connected to the fixed assembly, the moving screw rod is transmission connected to the slide seat, the motors are transmission connected to the two commutators, and the motor causes the moving screw rod to rotate synchronously through the commutator.

[0012] Preferably, one end of the coupling is rotatably connected to the mounting ring, and a margin for relative sliding with the coupling is provided at the connection between the coupling and the mounting ring. The other end of the coupling is drivingly connected to the input shaft of a speed and torque measuring device. The coupling comprises two symmetrically arranged connecting cylinders, which are flexibly connected. A rotating ring is rotatably connected to the connecting cylinder, and a limiting ring is slidably connected to the connecting cylinder. A plurality of rotating cylinders rotatably connected to the connecting cylinder are provided between the limiting ring and the rotating ring, and the rotating cylinders are meshed with the rotating ring and the rotating cylinders.

[0013] Preferably, the inner wall of the connecting cylinder is provided with a plurality of limit grooves along its circumference, and the interior of the connecting cylinder is slidably connected with a fixed plate through the limit grooves, and the fixed plate and the limit grooves are slidably connected by a spring, and an electromagnet B and a limit pin are fixed to one end of the fixed plate, and the limit pin passes through the electromagnet B, and a groove corresponding to the limit pin is provided on the electric spindle, and a battery is fixed to the other end of the fixed plate, and the battery supplies power to the electromagnet B.

[0014] Preferably, the outer wall of the connecting cylinder is provided with a plurality of mounting grooves along its circumference, and spring sheets are provided in the mounting grooves. The inner side of the limiting ring is provided with a stop block corresponding to the mounting grooves along its circumference, and the stop block is inserted in the mounting groove and connected with the spring sheets. The limiting ring limits the rotating drum to prevent it from rotating.

[0015] Preferably, the lower end of the rotating cylinder is threadedly connected to a threaded rod, the lower end of the threaded rod is fixed with a clamping block, the left and right ends of the clamping block are hinged to one end of the telescopic cylinder, and the other end of the telescopic cylinder is hinged to the connecting cylinder.

[0016] Preferably, an adjusting screw is provided between the two fixed components, one end of the adjusting screw is rotatably connected to a fixed component fixed with a fixing ring, the adjusting screw is transmission-connected to another fixed component, the fixed component includes a vibration sensor, the lower end of the vibration sensor is fixed with a sliding seat slidably connected to a working test bench, the upper end of the vibration sensor is fixed with a clamping plate, the inside of the clamping plate is rotatably connected to a worm gear, the inner wall of the worm gear is evenly distributed with a plurality of top blocks, the inside of the clamping plate is slidingly provided with a plurality of clamping blocks, the clamping blocks correspond to the top blocks one-to-one, the clamping plate is rotatably connected to a worm, and the worm is transmission-connected to the worm gear.

[0017] Preferably, a plurality of hydraulic rods are fixed inside the fixing ring along its circumference, and distance measuring sensors C are fixed to the fixed ends of the hydraulic rods.

[0018] The electric spindle speed test system uses the above-mentioned electric spindle speed test bench, and includes the following steps: S1: Fix the electric spindle through the fixing assembly and connect the electric spindle to the speed and torque measuring device through the coupling; S2: The sliding rod, the distance sensor C and the telescopic rod extend to clamp the electric spindle, and the corresponding distance sensor A and distance sensor B detect the data of the electric spindle. At the same time, the moving screw rotates to drive the detection component to move to detect whether the electric spindle is concentric; S3: When the detection component detects the non-concentric position of the electric spindle and the uneven position of the surface, the marking component will mark it with ink to facilitate the adjustment and maintenance of the electric spindle; S4: The electric spindle and the speed torque measuring device are connected through a coupling. The speed torque measuring device is convenient for detecting the torque and speed of the electric spindle, and displaying and recording them through a data processing unit and a host computer.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. By performing mobile detection on the position of the rotating shaft of the electric spindle through the detection component, it is helpful to detect whether the rotating end of the electric spindle is concentric with the fixed end. At the same time, the specific non-concentric position of the rotating end can be obtained to ensure that the surface of the rotating end of the electric spindle is flat and concentric with the fixed end; by the ball bearings against the surface of the rotating end of the electric spindle, when encountering protrusions or depressions, the ball bearings and the slide bar will extend or retract relatively, and at the same time, the distance sensor A detects the extension amount of the slide bar in real time. Through the changes in the extension amount of the slide bar, it is obtained whether the surface of the rotating end of the electric spindle is smooth and whether it is concentric with the fixed end of the electric spindle.

[0020] 2. Through the cooperation of the marking component and the detection component, when the surface of the rotating end of the electric spindle is uneven or the rotating end of the electric spindle is not concentric with the fixed end, the marking component performs inkjet marking to facilitate rapid maintenance and adjustment of the electric spindle; by fixing the contact sensor on the ink supply ring, when the slide moves, it can effectively prevent the slide from hitting the mounting ring and the fixed ring, thereby preventing damage to some components.

[0021] 3. A coupling is set to connect the electric spindle and the input shaft of the speed and torque measuring device. The center lines of the rotating cylinder and the fixed plate arranged inside the coupling are located on the axis line inside the coupling. When the coupling rotates, the dynamic balance stability of the coupling itself can be guaranteed, thereby preventing errors in the detection data due to the unstable dynamic balance of the coupling when detecting the electric spindle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the clamping plate of the present invention; Figure 3 It is a schematic diagram of the overall structure of the present invention; Figure 4 It is a schematic diagram of a test bench of the present invention; Figure 5 It is an overall schematic diagram of the detection component of the present invention; Figure 6 It is an overall schematic diagram of the fixing cylinder of the present invention; Figure 7 It is a cross-sectional schematic diagram of the fixing tube of the present invention; Figure 8 It is a schematic diagram of the explosion of the inkjet chamber of the present invention; Fig. 9It is an overall schematic diagram of the mounting ring of the present invention; Fig.10 It is an overall schematic diagram of the coupling of the present invention; Fig.11 It is a partial enlarged schematic diagram of the coupling of the present invention; Fig.12 It is an exploded schematic diagram of the coupling of the present invention; Fig.13 It is a cross-sectional schematic diagram of a fixing assembly of the present invention; Fig.14 It is a schematic diagram of the overall structure of the fixing assembly of the present invention.

[0023] Explanation of the markings in the figure: 1. Working test bench; 2. Slide; 3. Mounting ring; 4. Fixed ring; 5. Coupling; 6. Clamping plate; 11. Speed ​​torque measuring device; 12. Data processing unit; 13. Host computer; 14. Adjusting screw; 15. Moving screw; 16. Motor; 17. Guide rod; 21. Ink supply ring; 22. Connecting ring; 23. Fixed cylinder; 24. Sliding rod; 25. Ball; 26. Distance sensor A; 27. Inkjet chamber; 28. Ink supply hose; 29. ​​Electromagnet A; 31. Telescopic rod; 311. Distance sensor B; 41. Hydraulic rod; 411. Distance sensor C; 51, connecting cylinder; 52, limiting ring; 53, rotating ring; 54, rotating cylinder; 55, fixing plate; 61, vibration sensor; 62, sliding seat; 63, worm wheel; 64, clamping block; 65, worm; 161, commutator; 511, mounting groove; 512, spring; 513, limiting groove; 211, contact sensor; 271, sliding column; 272, blocking ring; 273, plug; 274, spray hole; 521, stopper; 541, threaded rod; 542, clamping block; 543, telescopic cylinder; 551, electromagnet B; 552, limiting pin; 553, battery; 631, top block. 7, clamping block; 71, clamping rod; 72, hexagonal countersunk hole; 73, servo motor. DETAILED DESCRIPTION

[0024] The following embodiments of the present invention are described in further detail in conjunction with 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.

[0025] Embodiment 1: See also Figure 3 , Figure 4 and Fig.14The speed test bench and the test system of the electric spindle include a working test bench 1, a speed torque measuring device 11, a data processing unit 12, a host computer 13 and a motor 16 are fixed on the upper end of the working test bench 1. The data processing unit 12 and the host computer 13 are existing equipment. Again, no more details are given. The data processing unit 12 and the host computer 13 are mainly used to process, respond to and record the data generated by the device. The motor 16 provides power to ensure that the detection component can move and detect the rotating end of the electric spindle. The speed torque measuring device 11 is used to detect the speed and torque of the electric spindle. The upper end of the working test bench 1 is provided with two symmetrical devices. The fixing assembly is arranged in a fixed manner, and an electric spindle is fixed on two of the fixing assemblies. One of the fixing assemblies is slidably connected to the working test bench 1, and the other fixing assembly is fixedly connected to the working test bench 1. The fixing assembly realizes the fixation of the electric spindle and ensures that both ends of the electric spindle are at the same height. Furthermore, by setting one of the two fixing assemblies fixedly and the other slidingly, the fixing assembly can be suitable for electric spindles of different lengths, and the applicability is greater. The left end of the fixing assembly fixed on the working test bench 1 is fixed with a fixing ring 4, and the left end of the fixing ring 4 is provided with a detection assembly slidably connected to the working test bench 1. The position of the rotating shaft of the electric spindle is detected by the detection assembly. The mobile detection is beneficial to detect whether the rotating end and the fixed end of the electric spindle are concentric. At the same time, the specific non-concentric position of the rotating end can be obtained to ensure that the rotating end surface of the electric spindle is flat and concentric with the fixed end. The left end of the detection component is provided with a mounting ring 3 fixedly connected to the working test bench 1. The left end of the mounting ring 3 is rotatably connected with a coupling 5. The coupling 5 is used to connect the electric spindle and the speed and torque measuring device 11, so that the electric spindle drives the speed and torque measuring device 11 to rotate, and the speed and torque measuring device 11 is used to detect the speed and torque of the electric spindle. A plurality of guide rods 17 that penetrate the slide seat 2 are fixed between the mounting ring 3 and the fixed ring 4. The fixed component, The detection assembly, the mounting ring 3 and the fixing ring 4 are coaxially arranged, and a plurality of hydraulic rods 41 are fixed along the circumference of the fixing ring 4. The fixed ends of the hydraulic rods 41 are fixed with distance sensors C411. The hydraulic rods 41 are extended and retracted to clamp and fix the fixed end of the electric spindle. At the same time, the distance sensor C411 detects the extension amount of the hydraulic rods 41 to facilitate the fixation of the fixed end of the electric spindle. At the same time, the diameter of the electric spindle and whether the fixed end of the electric spindle is concentric with the fixing assembly and the fixing ring 4 can be obtained through the value change of the distance sensor C411. When the data of each distance sensor C411 are consistent, it means that the fixed end of the electric spindle is concentrically fixed with the fixing ring 4.

[0026] See also Figure 5 , Figure 6 , Figure 7Considering that during the use of the electric spindle, if the rotating end and the fixed end are not concentric, the motor will vibrate, affect the operation of the motor, and generate noise. At the same time, the internal friction of the non-concentric electric spindle increases, resulting in increased energy loss, thereby reducing the overall efficiency of the motor and shortening its service life. The detection component includes a slide 2, which is slidably connected to the working test bench 1. An ink supply ring 21 is fixed to the upper end of the slide 2, and a connecting ring 22 is fixed to the inner side of the ink supply ring 21. A plurality of fixed cylinders 23 are fixed to the inner side of the connecting ring 22 along its circumference. The fixed The interior of the cylinder 23 is slidably connected to a slide bar 24 through a spring, a distance sensor A26 is fixed to one end of the fixed cylinder 23 close to the slide bar 24, and a ball 25 is rollingly connected to one end of the slide bar 24 away from the distance sensor A26. The interior of the fixed cylinder 23 is hollow, and the slide bar 24 is slidably connected to the interior of the fixed cylinder 23 through a spring, and the ball 25 abuts against the surface of the rotating end of the electric spindle. When encountering a protrusion or a depression, the ball 25 and the slide bar 24 cooperate to extend or retract relatively, and at the same time, the distance sensor A26 detects the extension amount of the slide bar 24 in real time. The change in the extension amount of the slide bar 24 can be used to determine whether the surface of the rotating end of the electric spindle is smooth and whether it is concentric with the fixed end of the electric spindle. The lengths of the slide bars 24 extended in the natural state are the same. The fixed cylinder 23 and the slide bar 24 are both provided with an ink supply hose 28. The two ends of the ink supply hose 28 are respectively connected to the ink supply ring 21 and the inkjet chamber 27. The ink supply hose 28 connects the ink supply ring 21 and the fixed cylinder 23, which is beneficial to transport the ink in the ink supply ring 21 to the inkjet chamber 27, ensuring that there is sufficient ink in the inkjet chamber 27 to prevent the ink from being insufficient and causing marking to fail. The spray hole 274 opened at the lower end of the chamber 27 is annular and surrounds the ball 25 therein. Contact sensors 211 are fixed to the left and right ends of the ink supply ring 21. By fixing the contact sensor 211 on the ink supply ring 21, when the slide 2 moves, it is effectively prevented from hitting the mounting ring 3 and the fixing ring 4, and damage to some components is prevented. By cooperating with the marking component and the detection component, when the surface of the rotating end of the electric spindle is uneven or the rotating end of the electric spindle is not concentric with the fixed end, the marking component performs inkjet marking, which is convenient for rapid maintenance and adjustment of the electric spindle.

[0027] See also Figure 6 , Figure 7 and Figure 8Considering that when the rotating shaft of the electric spindle exposed at the fixed end is not concentric with the fixed end, it is not possible to determine where the electric spindle begins to be non-concentric. If it can be determined and marked, it is convenient to repair and adjust the electric spindle. The outer side of the ball 25 is provided with a marking component fixedly connected to the slide bar 24. The marking component performs inkjet marking on the uneven surface of the rotating end of the electric spindle or the position that causes the rotating end of the electric spindle to be non-concentric with the fixed end, which is convenient for rapid repair and adjustment of the electric spindle. The marking assembly includes an inkjet chamber 27, the inkjet chamber 27 is connected to the ink supply ring 21, the lower end of the inkjet chamber 27 has a plurality of nozzles 274 along its circumference, the interior of the inkjet chamber 27 is fixed with a plurality of slide posts 271 along its circumference, a plugging ring 272 is slidably connected to the slide post 271, the upper end of the plugging ring 272 is fixedly connected to the inkjet chamber 27 through a compression spring, and the lower end of the plugging ring 272 is fixed with a plurality of plugs 273 corresponding to the nozzles 274 along its circumference. An electromagnet A29 is fixed on the upper end of 27. When the ball 25 rolls on the rotating end face of the electric spindle and encounters an uneven rotating end face of the electric spindle, the ball 25 will move against the slide bar 24. At this time, the distance sensor A26 detects the extension and contraction amount of the slide bar 24, and the value of the distance sensor A26 will change. At this time, the electromagnet A29 is energized to absorb the blocking ring 272 upward, the spring on the blocking ring 272 is compressed, the plug 273 is away from the nozzle 274, and the ink in the inkjet chamber 27 is ejected. Inkjet marking is performed on the uneven rotating end surface of the electric spindle. When the value detected by the distance sensor A26 is restored, the electromagnet A29 is powered off. At this time, the spring on the blocking ring 272 will push the blocking ring 272 downward, so that the plug 273 is blocked in the nozzle hole 274 again. At this time, the ink in the inkjet chamber 27 is no longer sprayed out. At the same time, a sliding column 271 is arranged inside the inkjet chamber 27. The sliding column 271 guides the sliding of the blocking ring 272, so that the plug 273 can be accurately blocked in the nozzle hole 274.

[0028] See also Figure 3 , Figure 4 and Fig. 9Considering the concentric detection of the rotating end and the fixed end of the electric spindle, it is necessary to first perform fixed detection on the rotating end of the electric spindle to determine the axis of the electric spindle. At the same time, considering the detection of the end surface of the rotating end of the electric spindle, it is necessary to move the detection device to detect the changes in the surface of the rotating end of the electric spindle. The inner wall of the mounting ring 3 is fixed with a plurality of telescopic rods 31 along its circumference. The telescopic rods 31 clamp the end surface of the rotating end of the electric spindle. Distance measuring sensors B311 are fixed on the telescopic rods 31. The lengths of the telescopic rods 31 extended in a static state are consistent. The distance measuring sensor B311 detects the extension amount of the telescopic rods 31. When the electric spindle rotates, if the extension amount detected by the distance measuring sensor B311 changes repeatedly, it means that the rotating end of the electric spindle is not concentric with the electric spindle. The greater the change in the data detected by the distance measuring sensor B311, the lower the concentricity. When the data detected by sensor B311 remains unchanged, the rotating end of the surface electric spindle is concentric with the electric spindle, and two symmetrically arranged commutators 161 are fixed to the lower end of the mounting ring 3. The two commutators 161 are respectively connected to the movable screw 15 in a transmission manner. The movable screw 15 is rotatably connected to the fixed component, and the movable screw 15 is connected to the slide 2 in a transmission manner. The motor 16 is transmitted to the two commutators 161. The motor 16 causes the movable screw 15 to rotate synchronously through the commutator 161, and power is provided by the motor 16, and the transmission direction is changed through the commutator 161, so that the two movable screws 15 rotate synchronously. The rotation of the movable screw 15 drives the slide 2 to move, so that the detection component on the slide 2 detects the overall end face of the rotating end of the electric spindle, detects whether the rotating end face of the electric spindle is flat, and further detects whether the middle part of the rotating end of the electric spindle is concentric.

[0029] See also Figure 3 , Fig.10 , Fig.11 and Fig.12, considering that the connection between the electric spindle and the detection equipment is carried out through a coupling or a flange, and the flange and the coupling are usually connected with screws when connecting the electric spindle. Due to the different diameters of the electric spindle, the depth of the screw engagement will also be different. When the electric spindle is rotated and tested, the dynamic balance of the electric spindle will be affected, resulting in deviations in the detection data. One end of the coupling 5 is rotatably connected to the mounting ring 3, and a margin for relative sliding with the coupling 5 is provided at the connection between the coupling 5 and the mounting ring 3. The other end of the coupling 5 is drivingly connected to the input shaft of the speed and torque measuring device 11. The coupling 5 includes two symmetrically arranged connecting cylinders 51, the two connecting cylinders 51 are flexibly connected, a rotating ring 53 is rotatably connected to the connecting cylinder 51, a limiting ring 52 is slidably connected to the connecting cylinder 51, and a plurality of rotating cylinders 54 rotatably connected to the connecting cylinder 51 are arranged between the limiting ring 52 and the rotating ring 53, and the rotating cylinder 54 is meshed with the rotating ring 53 and the rotating cylinder 54. The coupling 5 is arranged to connect the electric spindle and the input shaft of the speed and torque measuring device 11, and the center lines of the rotating cylinder 54 and the fixing plate 55 arranged inside the coupling 5 are both located on the axis line inside the coupling 5. The coupling 5 can ensure the dynamic balance stability of the coupling 5 itself while rotating, so as to prevent the detection data from being erroneous due to the unstable dynamic balance of the coupling 5 when detecting the electric spindle. The inner wall of the connecting cylinder 51 is provided with a plurality of limit grooves 513 along its circumference. The interior of the connecting cylinder 51 is slidably connected with a fixing plate 55 through the limit grooves 513. The fixing plate 55 is slidably connected with the limit grooves 513 through a spring. An electromagnet B551 and a limit pin 552 are fixed to one end of the fixing plate 55. The limit pin 552 penetrates the electromagnet B551. The electric spindle is provided with a limit pin 553. 52 corresponds to the groove on the electric spindle, and a battery 553 is fixed at the other end of the fixed plate 55. The battery 553 supplies power to the electromagnet B551. When fixing the electric spindle, the limit pin 552 is engaged with the groove on the electric spindle to prevent the electric spindle from sliding when it rotates. At the same time, after the limit pin 552 corresponds to the groove on the electric spindle, the electromagnet B551 is energized to fix the electric spindle to prevent the electric spindle from detaching. The electromagnet B551, the limit pin 552 and the battery 553 are all arranged at the center of the fixed plate 55 to ensure the overall dynamic balance and stability of the coupling 5.

[0030] See also Figure 3 , Fig.10 , Fig.11 and Fig.12, considering that after the electric spindle is clamped and fixed, the electric spindle needs to rotate when it rotates. In order to prevent the rotating drum 54 from reversing and losing the clamping of the electric spindle, the rotating drum 54 needs to be fixed. The outer wall of the connecting cylinder 51 is provided with a plurality of mounting grooves 511 along its circumference. The mounting grooves 511 are each provided with a spring sheet 512. The inner side of the limiting ring 52 is provided with a stopper 521 corresponding to the mounting grooves 511 along its circumference. The stopper 521 is inserted into the mounting groove 511 and connected with the spring sheet 512. The limiting ring 52 limits the rotating drum 54 to prevent it from rotating. The lower end of the rotating drum 54 is threadedly connected with a threaded rod 541. The lower end of the threaded rod 541 is fixed with a clamping block 542. The left and right ends of the clamping block 542 are hinged with one end of the telescopic cylinder 543. The other end of the telescopic cylinder 543 is hinged to the connecting cylinder 51. When the electric spindle needs to be connected for transmission, the electric spindle needs to be further centrally positioned to prevent deviation from affecting the dynamic balance test of the electric spindle. The rotating end of the electric spindle is inserted into the connecting cylinder 51, and the limit ring 52 is pushed to one side to release the engagement between the limit ring 52 and the rotating cylinder 54. At the same time, the spring piece 512 is compressed. At this time, the rotating ring 53 is rotated, and the rotating ring 53 drives the rotating cylinder 54 to rotate. Since the threaded rod 541 is threadedly connected to the rotating cylinder 54, and the telescopic cylinder 543 limits the rotation of the clamping block 542, multiple threaded rods 541 are synchronously extended to clamp and fix the electric spindle. At this time, the limit ring 52 is released, and the spring piece 512 is restored against the limit ring 52, and the limit ring 52 is re-engaged with the rotating cylinder 54 to prevent the rotating cylinder 54 from rotating.

[0031] See also Figure 3 , Figure 4 , Fig.13 and Fig.14Considering that the fixed end of the electric spindle is fixed, in order to ensure that the axis center line of the fixed end of the electric spindle is horizontal, the electric spindle is fixed by a fixing device, and an adjusting screw 14 is provided between the two fixing components. One end of the adjusting screw 14 is rotatably connected to the fixing component fixed with the fixing ring 4, and the adjusting screw 14 is transmission-connected to another fixing component. By connecting the fixing components by adjusting the screw 14, the distance between the two fixing components can be adjusted, so that the device can fix electric spindles of different lengths. At the same time, the positions of the fixing holes of the two fixing components are concentrically arranged to ensure that the two ends of the electric spindle are horizontal when the electric spindle is fixed. The fixing component includes a vibration sensor 61, and the lower end of the vibration sensor 61 is fixed with A sliding seat 62 is slidably connected to the working test bench 1, and a clamping plate 6 is fixed on the upper end of the vibration sensor 61. A worm gear 63 is rotatably connected inside the clamping plate 6. A plurality of top blocks 631 are evenly distributed on the inner wall of the worm gear 63. A plurality of clamping blocks 64 are slidably arranged inside the clamping plate 6. The clamping blocks 64 correspond to the top blocks 631 one by one. A worm 65 is rotatably connected to the clamping plate 6, and the worm 65 is transmission-connected to the worm gear 63. When fixing the electric spindle, the worm 65 is rotated, the worm 65 meshes with the worm gear 63, and drives the rotating ring 53 to rotate. At this time, the top block 631 inside the worm gear 63 rotates accordingly, and the top block 631 gradually and synchronously squeezes and ejects the clamping block 64, thereby clamping and fixing the electric spindle.

[0032] Embodiment 2: Please refer to Figure 1 and Figure 2The clamping plate 6 is internally slidably connected with a clamping block 7, and one side of the clamping block 7 is conveniently connected to a clamping rod 71 for transmission. The clamping rod 71 adopts an electric telescopic rod, and the outer wall of the fixed section of the clamping rod 71 is provided with a thread. The clamping rod 71 is connected to the clamping plate 6 through a thread, and one end of the clamping rod 71 is connected to the clamping block 7. The other end of the clamping rod 71 is provided with a hexagonal countersunk hole 72, and a hexagonal rod is transmitted and slidably connected in the hexagonal countersunk hole 72. The hexagonal rod is transmission-connected with a servo motor 73, and the servo motor 73 is fixedly connected to the clamping plate 6. When in use, the electric spindle is placed in the center of the clamping plate 6, and the clamping rod 71 is controlled to work synchronously, so that the protruding end of the clamping block 7 moves against the clamping block 7. The electric spindle is initially clamped and fixed, and then the rotating end of the electric spindle is connected to the input end of the speed and torque measuring device 11 through a coupling. The speed and torque measuring device 11 is an existing device and is internally provided with an angle sensor. The electric spindle is started to work at a low speed, and the maximum phase point of the vibration of the electric spindle during rotation is determined by the cooperation between the vibration sensor 61 and the built-in angle sensor of the speed and torque measuring device 11. The servo motor 73 relative to the electric spindle is used to drive the hexagonal rod to rotate, and then the clamping rod 71 is rotated to adjust the concentricity of the electric spindle. The electric spindle is started again to rotate, and the minimum vibration point is determined after multiple corrections, and then a high-speed performance test is performed. After the test is completed, the clamping rod 71 is retracted and reset for the next test.

[0033] When the present invention is used: First, the worm 65 is rotated, and the worm 65 meshes with the worm wheel 63, driving the rotating ring 53 to rotate. At this time, the top block 631 inside the worm wheel 63 rotates accordingly, and the top block 631 gradually squeezes and ejects the clamping block 64 synchronously, thereby clamping and fixing the electric spindle, and the limit pin 552 is connected with the groove on the electric spindle to prevent the electric spindle from sliding when it rotates. At the same time, after the limit pin 552 corresponds to the groove on the electric spindle, the electromagnet B551 is energized to fix the electric spindle, and the other end of the coupling 5 Repeat the operation to fix the connection with the speed torque measuring device 11, the hydraulic rod 41 is extended and retracted to clamp and fix the fixed end of the electric spindle, and the distance sensor C411 detects the extension amount of the hydraulic rod 41, so as to facilitate the fixation of the fixed end of the electric spindle. At the same time, the diameter of the electric spindle and whether the fixed end of the electric spindle is concentric with the fixed assembly and the fixed ring 4 can be obtained through the value change of the distance sensor C411. When the data of each distance sensor C411 are consistent, it means that the fixed end of the electric spindle is concentrically fixed with the fixed ring 4; Then, the ball 25 abuts against the surface of the rotating end of the electric spindle. When encountering a protrusion or a depression, the ball 25 and the slide bar 24 cooperate to extend or retract relatively. At the same time, the distance sensor A26 detects the extension amount of the slide bar 24 in real time. Through the change of the extension amount of the slide bar 24, it is obtained whether the surface of the rotating end of the electric spindle is smooth and whether it is concentric with the fixed end of the electric spindle. Next, when the slide 2 moves, it is effectively prevented from hitting the mounting ring 3 and the fixing ring 4, and from damaging some components. By cooperating with the marking component and the detection component, when the surface of the rotating end of the electric spindle is uneven or the rotating end of the electric spindle is not concentric with the fixed end, the marking component performs inkjet marking, which facilitates rapid maintenance and adjustment of the electric spindle. Finally, the data processing unit 12 and the host computer 13 process, respond and record the data generated by the device. The motor 16 provides power to ensure that the detection component can move and detect the rotating end of the electric spindle. The speed and torque measuring device 11 is used to detect the speed and torque of the electric spindle.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A speed test bench for an electric spindle, comprising a working test bench (1), wherein a speed and torque measuring device (11), a data processing unit (12), a host computer (13) and a motor (16) are fixed to the upper end of the working test bench (1), characterized in that: The upper end of the working test bench (1) is provided with two symmetrically arranged fixing components, on which an electric spindle is fixed, the fixing components comprising a clamping plate (6), one of the fixing components being slidably connected to the working test bench (1), and the other fixing component being fixedly connected to the working test bench (1), the left end of the electric spindle being connected to a coupling (5), the left end of the coupling (5) being connected to a speed torque measuring device (11), the interior of the clamping plate (6) being slidably connected to a clamping block (7), one side of the clamping block (7) being convenient for transmission connection. A clamping rod (71) is connected, the clamping rod (71) is an electric telescopic rod, the outer wall of the fixed section of the clamping rod (71) is provided with a thread, the clamping rod (71) is connected to the clamping plate (6) through the thread, one end of the clamping rod (71) is connected to the clamping block (7), the other end of the clamping rod (71) is provided with a hexagonal countersunk hole (72), a hexagonal rod is transmission-connected and slidably connected in the hexagonal countersunk hole (72), the hexagonal rod is transmission-connected to a servo motor (73), and the servo motor (73) is fixedly connected to the clamping plate (6).

2. The electric spindle speed test bench according to claim 1, characterized in that: One end of the coupling (5) is rotatably connected to the mounting ring (3); a margin for relative sliding with the coupling (5) is provided at the connection between the coupling (5) and the mounting ring (3); the other end of the coupling (5) is drivingly connected to the input shaft of a speed and torque measuring device (11); the coupling (5) comprises two symmetrically arranged connecting cylinders (51); the two connecting cylinders (51) are flexibly connected; a rotating ring (53) is rotatably connected to the connecting cylinder (51); a limit ring (52) is slidably connected to the connecting cylinder (51); a plurality of rotating cylinders (54) rotatably connected to the connecting cylinder (51) are provided between the limit ring (52) and the rotating ring (53); the rotating cylinders (54) are meshed with the rotating ring (53) and the rotating cylinders (54).

3. The electric spindle speed test bench according to claim 2, characterized in that: The inner wall of the connecting cylinder (51) is provided with a plurality of limiting grooves (513) along its circumference; a fixing plate (55) is slidably connected to the interior of the connecting cylinder (51) via the limiting grooves (513); the fixing plate (55) and the limiting grooves (513) are slidably connected via a spring; an electromagnet B (551) and a limiting pin (552) are fixed to one end of the fixing plate (55); the limiting pin (552) penetrates the electromagnet B (551); a groove corresponding to the limiting pin (552) is provided on the electric spindle; a storage battery (553) is fixed to the other end of the fixing plate (55); the storage battery (553) supplies power to the electromagnet B (551).

4. The electric spindle speed test bench according to claim 3, characterized in that: The outer wall of the connecting cylinder (51) is provided with a plurality of mounting grooves (511) along its circumference, and each of the mounting grooves (511) is provided with a spring sheet (512). The inner side of the limiting ring (52) is provided with a stopper (521) corresponding to the mounting grooves (511) along its circumference, and the stopper (521) is inserted into the mounting grooves (511) and connected to the spring sheet (512). The limiting ring (52) limits the rotating cylinder (54) to prevent it from rotating.

5. The electric spindle speed test bench according to claim 4, characterized in that: The lower end of the rotating cylinder (54) is threadedly connected to a threaded rod (541), the lower end of the threaded rod (541) is fixed to a clamping block (542), the left end and the right end of the clamping block (542) are hinged to one end of a telescopic cylinder (543), and the other end of the telescopic cylinder (543) is hinged to the connecting cylinder (51).

6. The electric spindle speed test bench according to claim 5, characterized in that: An adjusting screw (14) is provided between the two fixed assemblies, one end of the adjusting screw (14) is rotatably connected to a fixed assembly to which a fixing ring (4) is fixed, and the adjusting screw (14) is transmission-connected to the other fixed assembly, the fixed assembly comprising a vibration sensor (61), a sliding seat (62) slidably connected to the working test bench (1) being fixed at the lower end of the vibration sensor (61), a clamping plate (6) being fixed at the upper end of the vibration sensor (61), a worm gear (63) being rotatably connected inside the clamping plate (6), a plurality of top blocks (631) being evenly distributed on the inner wall of the worm gear (63), a plurality of clamping blocks (64) being slidably provided inside the clamping plate (6), the clamping blocks (64) corresponding one-to-one to the top blocks (631), a worm (65) being rotatably connected to the clamping plate (6), and the worm (65) being transmission-connected to the worm gear (63).

7. The electric spindle speed test system is characterized by: The speed test bench for the electric spindle according to claim 6 comprises the following steps: S1: fixing the electric spindle by means of a fixing assembly, and connecting the electric spindle to a speed and torque measuring device (11) by means of a coupling (5); S2: starting the electric spindle to work at a low speed, and determining the maximum phase point of vibration when the electric spindle rotates by cooperating with the vibration sensor (61) and the angle sensor built into the speed and torque measuring device (11); S3: Use the servo motor (73) to drive the hexagonal rod to rotate, and then rotate the clamping rod (71) to adjust the concentricity of the electric spindle, and start the electric spindle again to rotate. After multiple calibrations, the minimum vibration point is determined; S4: After the detection is completed, the servo motor (73) drives the clamping rod (71) to be retracted and reset for the next detection.

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