High-precision shaft workpiece grinding device

Abstract

The invention relates to the technical field of shaft workpiece machining, and discloses a high-precision shaft workpiece grinding device which comprises a machine tool frame, the two sides of the machine tool frame are each provided with an axis positioning assembly for positioning the axis position of a shaft, and the machine tool frame is slidably connected with an end fixing assembly for fixing one end of the shaft. A transverse moving assembly enabling the end fixing assembly to move along the machine tool frame is arranged in the machine tool frame, a rotary fixing assembly enabling a shaft piece to rotate is arranged on the machine tool frame, and a grinding set for grinding a workpiece is arranged on the machine tool frame through a driving assembly. When the shaft workpiece is installed, the axis of the shaft workpiece can be accurately made to coincide with the axes of the fixing pieces at the two ends, the situation of bending deformation caused by self weight or clamping force in the installation process is effectively reduced, vibration caused by centrifugal force can be remarkably reduced, and therefore the machining precision and stability are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of shaft workpiece processing, in particular to a high-precision shaft workpiece grinding device. Background Art

[0002] In the field of precision machinery manufacturing, the machining accuracy of shaft workpieces directly affects the performance, lifespan and operational stability of mechanical equipment. Such workpieces usually require extremely high geometric accuracy and surface quality. Especially in the fields of aerospace, precision machine tools, medical equipment and new energy vehicles, strict requirements are placed on the dimensional consistency, form and position tolerances and surface integrity of shaft parts.

[0003] After searching, the Chinese patent with announcement number CN107639478B discloses an intelligent grinding device for long-axis workpieces. This device can achieve the purpose of fully grinding the workpiece, automatically grinding the entire process, eliminating grinding dead corners, and improving the grinding efficiency of the workpiece. However, the following problems still exist: 1. When installing the shaft workpiece on the device, it is generally installed by manual handling. When clamping, the shaft workpiece needs to be manually lifted and aligned before clamping and fixing its end. The accuracy of manual visual inspection cannot be guaranteed, and a lot of time is consumed during the process, thereby reducing the efficiency of shaft workpiece installation. Therefore, how to quickly and accurately fix the shaft workpiece is an urgent problem that needs to be solved. 2. When grinding shaft workpieces, they are usually fixed by tightening both ends. However, when facing slender shafts, the middle of the shaft will bend downward due to its own gravity, which will easily cause vibration during the rotation of the shaft, resulting in deviations in the grinding results of the shaft workpiece. Therefore, how to solve the stability of the long shaft processing process and ensure the grinding accuracy is an urgent problem that needs to be solved now. 3. Using conical pins to fix both ends of the shaft can effectively ensure the stability of the shaft, but not all processed shaft workpieces have tapered grooves at the ends. This method is not applicable when facing solid shafts or tubular hollow shafts. Therefore, how to solve the problem of how to stably clamp a variety of different shaft workpieces is also an urgent problem that needs to be solved. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a high-precision shaft workpiece grinding device, which is mainly used to solve the problems that when the shaft workpiece is installed on the device, it is generally installed by manual transportation, and when clamping, the shaft workpiece needs to be manually lifted and aligned and then its ends are clamped and fixed. The manual visual inspection accuracy cannot be guaranteed, and a lot of time is consumed during the process, thereby reducing the efficiency of shaft workpiece installation. When grinding the shaft workpiece, it is generally fixed by tightening the two ends. However, when facing a slender shaft, the middle position of the shaft will bend downward due to its own gravity, which is prone to vibration during the rotation of the shaft, which in turn leads to deviations in the grinding results of the shaft workpiece. The use of conical tops to fix the two ends of the shaft can effectively ensure the stability of the shaft, but not all processed shaft workpiece ends have conical grooves, and this method is not applicable when facing solid shafts or tubular hollow shafts.

[0005] To achieve the above object, the present invention provides the following technical solutions: A high-precision shaft workpiece grinding device includes a machine tool frame, and a group of axis positioning components for positioning the axis position of the shaft are provided on both sides of the machine tool frame. An end fixing component for fixing one end of the shaft is slidably connected to the machine tool frame, and a transverse movement component for moving the end fixing component along the machine tool frame is provided in the machine tool frame. A rotating fixing component for rotating the shaft is provided on the machine tool frame. A grinding component for grinding the workpiece is provided on the machine tool frame through a driving component, and a lifting component for lifting the bottom of the shaft when it is ground is provided on the driving component.

[0006] The top outer wall of the U-shaped slide is fixedly connected to the H-shaped frame, and the upper surface of the slide is fixedly connected to the H-shaped frame, and the U-shaped slide is slidably connected to the H-shaped frame. An electric push rod 1 is fixedly connected between the U-shaped slide and the H-shaped frame, and two symmetrical U-shaped limit plates are fixedly connected to the top inner wall of the U-shaped slide, and slides are slidably connected in the two U-shaped limit plates. One end of the two slides is fixedly connected to the connecting frame, and a positioning wheel is rotatably connected between the inner walls on both sides of the two brackets through bearings. The top outer wall of the U-shaped slide is fixedly connected to the end plate, and an electric push rod 2 is fixedly connected between one side of the end plate and one side of the connecting frame.

[0007] On the basis of the above-mentioned scheme, the end fixing assembly includes a base plate slidably connected to the machine tool frame, an L-shaped seat is fixedly connected to the upper surface of the base plate, a square opening is opened at one end of the L-shaped seat, a sliding frame is slidably connected in the square opening, three mounting seats are fixedly connected to the outer wall of one side of the sliding frame, and one end of the three mounting seats is respectively fixedly connected to a three-jaw chuck 1, a conical ejector pin and a three-jaw chuck 2, and the three jaws in the three-jaw chuck 1 are arranged in reverse.

[0008] As a further solution of the present invention, positioning holes corresponding to the positions of the three mounting seats are provided on the sliding frame, and a through hole is provided on one side of the L-shaped seat for use with the positioning holes, and screws are used to cooperate with the positioning holes.

[0009] Furthermore, the transverse movement assembly includes a fixed block fixedly connected to the lower surface of the base plate, a screw rod is rotatably connected between the inner walls of both sides of the machine tool frame, the screw rod passes through the fixed block and is threadedly connected thereto, a guide rod is fixedly connected between the inner walls of both sides of the machine tool frame and at both sides of the screw rod, both of the guide rods pass through the fixed block and are slidably connected thereto, and a driving motor 1 is fixedly connected to the outer wall of one side of the machine tool frame for causing the screw rod to rotate forward and reverse along the axial direction.

[0010] On the basis of the above-mentioned scheme, the rotating fixing assembly includes a three-jaw chuck three rotatably connected to one side of the machine tool frame through a bearing, the machine tool frame is rotated through a connecting shaft, and one end of the connecting shaft is fixed to the three-jaw chuck, a driven pulley one is fixedly connected to the circumferential outer wall of one end of the connecting shaft, the upper surface of the machine tool frame is fixedly connected to a driving motor two, one end of the output shaft of the driving motor two is fixedly connected to a driving pulley one, and the driving pulley one and the driven pulley one are connected by a belt drive.

[0011] As a further solution of the present invention, the driving assembly includes a frame body fixedly connected to the machine tool frame, a transverse plate is slidably connected to the frame body, two symmetrical fixed plates are fixedly connected at both ends of the top outer wall of the frame body, and a rotating rod is rotatably connected between the two fixed plates on the same side, and two transmission wheels are fixedly connected to the circumferential outer walls of the two rotating rods, and the two transmission wheels at corresponding positions of the two groups are connected by transmission belts, and the transmission belt located above the transverse plate is fixed to the upper surface of the transverse plate by a buckle, and one side of one of the fixed plates is fixedly connected to a driving motor three that makes the rotating rod reverse along the axial direction.

[0012] Furthermore, the grinding assembly includes a penetrating slide that is slidably connected to the transverse plate, and two symmetrical V-shaped frames are fixedly connected to the bottom outer wall of the penetrating slide, and a protective shell is fixedly connected between the two V-shaped frames. A grinding wheel is rotatably connected between the inner walls on both sides of the protective shell through a bearing, and one end of the grinding wheel shaft is fixedly connected to a driven pulley 2 through the outer wall of one side of the protective shell. A driving motor 4 is fixedly connected to the bottom inner wall of the penetrating slide, and the end of the output shaft of the driving motor 4 is keyed to the active pulley 2, and the active pulley 2 and the driven pulley 2 are also connected by a belt drive, and an electric push rod 3 is fixedly connected between the top inner wall of the penetrating slide and the upper surface of the transverse plate.

[0013] Based on the above scheme, the lifting assembly includes an arc frame fixedly connected to one side of the transverse plate, the other end of the arc frame is fixedly connected to a support plate, the support plate is slidingly connected to a support frame, and the four corners of the support frame are rotatably connected to rotating wheels.

[0014] As a further solution of the present invention, a threaded hole is provided on the support plate, a threaded rod is threadedly connected to the threaded hole, and one end of the threaded rod is rotatably connected to the lower surface of the support frame through a bearing.

[0015] Compared with the prior art, the present invention provides a high-precision shaft workpiece grinding device with the following beneficial effects: 1. The present invention provides two sets of axis positioning components on both sides of the machine tool frame, which can accurately make the axis of the axis workpiece coincide with the axis of the fixing parts at both ends when installing the axis workpiece, and does not require manual multiple alignment when installing the axis workpiece, thereby effectively increasing the efficiency and accuracy of the axis workpiece installation.

[0016] 2. The present invention actively offsets the bending deformation caused by gravity and grinding force through the lifting assembly, significantly reduces the vibration caused by centrifugal force, thereby improving processing accuracy and stability, and the lifting assembly and the grinding assembly move synchronously, further ensuring that any position in the grinding process can be effectively supported.

[0017] 3. The present invention uses an end fixing assembly, which integrates an outward-type three-jaw chuck 1, a conical ejector pin and an inner-type three-jaw chuck 2 into one. When facing different shaft workpieces, the sliding frame can be replaced. It is applicable to different shaft workpieces and has a simple structure, which is easy to adjust according to actual conditions.

[0018] 4. The present invention can change the height of the support frame and thus the height of the rotating wheel by means of the threaded rod and threaded hole, thereby being able to adapt to shaft workpieces of different diameters and increasing the adaptability of the lifting assembly.

[0019] 5. The present invention provides electric push rods 1 and 2 in the axis positioning assembly, which can move to both sides after the axis is positioned, so as to avoid interference with other components during the grinding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the front three-dimensional structure of a high-precision shaft workpiece grinding device proposed by the present invention; Figure 2 This is a schematic diagram of the rear three-dimensional structure of a high-precision shaft workpiece grinding device proposed by the present invention; Figure 3 This is a schematic diagram of the structure of the axis positioning component of a high-precision shaft workpiece grinding device proposed by the present invention; Figure 4 This is a schematic diagram of the structure of the end fixing assembly of a high-precision shaft workpiece grinding device proposed by the present invention; Figure 5 A high-precision shaft workpiece grinding device proposed by the present invention Figure 4 Schematic diagram of a local enlarged structure; Figure 6 This is a schematic diagram of the structure of a transverse movement component of a high-precision shaft workpiece grinding device proposed by the present invention; Figure 7 This is a schematic diagram of the structure of the rotating and fixing components of a high-precision shaft workpiece grinding device proposed by the present invention; Figure 8 This is a schematic diagram of the drive assembly structure of a high-precision shaft workpiece grinding device proposed by the present invention; Figure 9 A high-precision shaft workpiece grinding device proposed by the present invention Figure 8 Schematic diagram of a local enlarged structure; Figure 10 This is a schematic diagram of the grinding assembly structure of a high-precision shaft workpiece grinding device proposed by the present invention; Figure 11 This is a schematic diagram of the structure of a lifting component of a high-precision shaft workpiece grinding device proposed by the present invention.

[0021] 1. Machine tool frame; 2. Axis positioning assembly; 201. Guide rail; 202. Slider; 203. H-shaped frame; 204. U-shaped slide; 205. Electric push rod 1; 206. U-shaped limit plate; 207. Slide plate; 208. Connecting frame; 209. End plate; 210. Electric push rod 2; 211. Bracket; 212. Positioning wheel; 3. End fixing assembly; 301. Bottom plate; 302. L-shaped seat; 303. Square mouth; 304. Slide frame; 305. Mounting seat; 306. Three-jaw chuck 1; 307. Conical ejector pin; 308. Three-jaw chuck 2; 309. Positioning hole; 310. Through hole; 311. Screw; 4. Transverse movement assembly; 401. Fixing block; 402. Screw rod; 403. Guide rod; 404. Drive motor 1; 5. Rotary fixed assembly Fixed assembly; 501, three-jaw chuck three; 502, drive motor two; 503, connecting shaft; 504, active pulley one; 505, driven pulley one; 6, drive assembly; 601, frame; 602, transverse plate; 603, fixed plate; 604, rotating rod; 605, transmission wheel; 606, transmission belt; 607, drive motor three; 608, buckle; 7, grinding assembly; 701, penetrating slide; 702, electric push rod three; 703, V-shaped frame; 705, protective shell; 706, grinding wheel; 707, driven pulley two; 708, drive motor four; 709, active pulley two; 8, lifting assembly; 801, arc frame; 802, support plate; 803, support frame; 804, rotating wheel; 805, threaded hole; 806, threaded rod. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or component being referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0024] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0025] See also Figures 1-11 As shown, a high-precision shaft workpiece grinding device includes a machine tool frame 1, and a group of axis positioning components 2 for positioning the axis position of the shaft are provided on both sides of the machine tool frame 1. An end fixing component 3 for fixing one end of the shaft is slidably connected to the machine tool frame 1, and a transverse movement component 4 for moving the end fixing component 3 along the machine tool frame 1 is provided in the machine tool frame 1. A rotating fixing component 5 for rotating the shaft is provided on the machine tool frame 1. A grinding component 7 for grinding the workpiece is provided on the machine tool frame 1 through a driving component 6, and a lifting component 8 for lifting the bottom of the shaft when it is ground is provided on the driving component 6.

[0026] When grinding the shaft workpiece, first place the shaft workpiece on the lifting assembly 8. At this time, the axis of the shaft workpiece is slightly lower than the axis between the end fixing assembly 3 and the rotating fixing assembly 5. Then, the axis positioning assemblies 2 on both sides of the machine tool frame 1 are used to squeeze the shaft workpiece so that the axis of the shaft workpiece coincides with the axis between the end fixing assembly 3 and the rotating fixing assembly 5. Then, the end fixing assembly 3 is driven by the transverse movement assembly 4 to push the shaft workpiece toward the rotating fixing assembly 5 until the shaft workpiece is sent to the rotating fixing assembly 5 for fixation. Then, the axis positioning assembly 2 is reset to avoid position for subsequent grinding operations. Then, the grinding assembly 7 is started and the driving assembly 6 is used to make the grinding assembly 7 reciprocate on the surface of the shaft workpiece for grinding. At the same time, the bottom of the shaft workpiece is lifted by the lifting assembly 8. The process of placing the shaft workpiece generates vibration that affects the accuracy.

[0027] In order to solve the technical problem of axis positioning of shaft workpieces, the present invention adopts an axis positioning assembly 2 including guide rails 201 fixedly connected to both sides of the machine tool frame 1 by bolts, two sliders 202 are slidably connected to the guide rails 201, the upper surface of the slider 202 is fixedly connected to an H-shaped frame 203 by bolts, and a U-shaped slide 204 is slidably connected to the H-shaped frame 203. An electric push rod 205 is fixedly connected between the U-shaped slide 204 and the H-shaped frame 203 by bolts, and two symmetrical push rods are fixedly connected on the top inner wall of the U-shaped slide 204 by bolts. There are U-shaped limit plates 206, and slides 207 are slidably connected inside the two U-shaped limit plates 206. One end of the two slides 207 is fixedly connected to a connecting frame 208 by bolts. Two symmetrical brackets 211 are fixedly connected to the connecting frame 208 by bolts. Positioning wheels 212 are rotatably connected between the inner walls of the two brackets 211 through bearings. The top outer wall of the U-shaped slide 204 is fixedly connected to an end plate 209 by bolts, and an electric push rod 210 is fixedly connected between one side of the end plate 209 and one side of the connecting frame 208 by bolts.

[0028] By means of the electric push rod 1 205 and the electric push rod 2 210 provided in the axis positioning assembly 2, the axis can be moved to both sides after the axis positioning is completed, so as to avoid interference with other components during the grinding process.

[0029] Specifically, multiple electric push rods 210 are started simultaneously to extend, and the connecting frame 208 is pushed to move by the slide 207 sliding in the U-shaped limit plate 206. When the connecting frame 208 moves, the positioning wheel 212 is driven by the bracket 211 to move toward the direction close to the shaft workpiece. Multiple groups of positioning wheels 212 squeeze the shaft workpiece so that the axis of the shaft workpiece and the axis between the end fixing component 3 and the rotating fixing component 5 coincide with each other, thereby completing the positioning of the axis of the shaft workpiece.

[0030] After the installation of the shaft workpiece is completed, the electric push rod 1 205 and the electric push rod 2 210 are started to retract, so that the axis positioning component 2 is reset to the initial position to avoid the subsequent grinding operation.

[0031] Two sets of axis positioning components 2 are respectively provided on both sides of the machine tool frame 1, which can accurately make the axis of the axis workpiece coincide with the axis of the fixing parts at both ends when the axis workpiece is installed, reduce the bending deformation caused by its own weight or clamping force, and ensure the straightness of the axis throughout its entire length.

[0032] In order to solve the technical problem of fixing the ends of various shaft workpieces, the present invention adopts an end fixing assembly 3 including a base plate 301 slidably connected to the machine tool frame 1, and the upper surface of the base plate 301 is fixedly connected to an L-shaped seat 302 by bolts, and a square opening 303 is opened at one end of the L-shaped seat 302, and a sliding frame 304 is slidably connected in the square opening 303, and three mounting seats 305 are fixedly connected to the outer wall of one side of the sliding frame 304 by bolts, and one end of the three mounting seats 305 is respectively fixedly connected to a three-jaw chuck 1 306, a conical ejector pin 307 and a three-jaw chuck 2 308 by bolts, and the three jaws in the three-jaw chuck 1 306 are set in reverse.

[0033] Furthermore, positioning holes 309 corresponding to the positions of the three mounting seats 305 are formed on the sliding frame 304 , and a through hole 310 used in conjunction with the positioning holes 309 is formed on one side of the L-shaped seat 302 , and a screw 311 used in conjunction with the through hole 310 and the positioning hole 309 is formed.

[0034] Specifically, when the fixed block 401 moves, the base plate 301 on it will be driven to move synchronously, and then the conical ejector pin 307 on the slide frame 304 will be pushed toward the direction close to the shaft workpiece through the L-shaped seat 302 on the base plate 301 and the slide frame 304. After the conical ejector pin 307 is embedded in the conical groove at the end of the shaft workpiece, it will push the shaft workpiece to move.

[0035] When the end of the shaft workpiece does not have a tapered groove, remove the screw 311 to disengage it from the positioning hole 309. If the end of the shaft workpiece is tubular, slide the slide frame 304 downward to align the first positioning hole 309 on it with the through hole 310, and then install the screw 311. When fixing the end of the shaft, use a chuck wrench to rotate any one of the three bevel teeth on the circumference of the three-jaw chuck 306, so that the three jaws move toward the outside of the circumference together to fix the inner wall of the tube in an external support manner.

[0036] If the shaft workpiece is in a solid state, slide the slide frame 304 upward to align the third positioning hole 309 on it with the through hole 310, and then install the screw 311. When fixing the end of the shaft, use the chuck wrench to rotate any one of the three bevel teeth on the circumference of the three-jaw chuck 2 308, so that the three jaws move toward the center together, thereby fixing one end of the shaft workpiece.

[0037] The outer three-jaw chuck 1 306, the conical ejector pin 307 and the inner three-jaw chuck 2 308 are integrated into the chuck. When facing different shaft workpieces, the sliding frame 304 can be replaced. It is applicable to different shaft workpieces and has a simple structure, which is easy to adjust according to actual conditions.

[0038] In the present invention, the transverse movement assembly 4 includes a fixed block 401 fixedly connected to the lower surface of the base plate 301 by bolts, and a screw rod 402 is rotatably connected between the inner walls of the two sides of the machine tool frame 1. The screw rod 402 passes through the fixed block 401 and is threadedly connected thereto. Guide rods 403 are fixedly connected by bolts between the inner walls of the two sides of the machine tool frame 1 and located on both sides of the screw rod 402. Both guide rods 403 pass through the fixed block 401 and are slidably connected thereto. A driving motor 404 is fixedly connected to the outer wall of one side of the machine tool frame 1 by bolts to make the screw rod 402 rotate forward and reverse along the axial direction.

[0039] It should be noted that the drive motor 404 is a prior art, and those skilled in the art can configure it according to actual needs, which will not be described in detail here.

[0040] Specifically, after the axis of the shaft workpiece is positioned, the drive motor 404 is started to drive the screw rod 402 to rotate. During the rotation of the screw rod 402, the fixed block 401 is driven to move along the screw rod 402 toward the direction close to the shaft workpiece.

[0041] In order to solve the technical problem of rotating shaft-type workpieces, the present invention adopts a rotating fixing component 5 including a three-jaw chuck 3 501 rotatably connected to one side of a machine tool frame 1 through a bearing, a connecting shaft 503 is rotatably connected through the machine tool frame 1, and one end of the connecting shaft 503 is fixed to the three-jaw chuck 3 501, a driven pulley 1 505 is fixedly connected to the circumferential outer wall of one end of the connecting shaft 503 by bolts, a driving motor 2 502 is fixedly connected to the upper surface of the machine tool frame 1 by bolts, one end of the output shaft of the driving motor 2 502 is fixedly connected to the driving pulley 1 504 by bolts, and the driving pulley 1 504 and the driven pulley 1 505 are connected by a belt drive.

[0042] It should be noted that the second driving motor 502 is a prior art, and those skilled in the art can configure it according to actual needs, which will not be described in detail here.

[0043] Specifically, after the other end of the shaft workpiece is inserted into the three-jaw chuck 501, use the chuck wrench to rotate any one of the three bevel teeth on the circumference of the three-jaw chuck 501, so that the three jaws move toward the center together, thereby clamping and fixing one end of the shaft workpiece, thereby completing the installation of the shaft workpiece; After completing the installation of the shaft workpiece, start the electric push rod 1 205 and the electric push rod 2 210 to retract, so that the axis positioning assembly 2 is reset to the initial position to avoid position for subsequent grinding operations, and then start the drive motor 2 502 to rotate the driven pulley 1 505 through the active pulley 1 504 and the belt. While the driven pulley 1 505 rotates, the three-jaw chuck 3 501 will rotate through the connecting shaft 503, so that the shaft workpiece rotates slowly along the axis direction.

[0044] It should be noted that the three-jaw chuck is an existing technology, including a chuck body, jaws embedded in the T-slot of the chuck, small bevel gears and large bevel gears in square holes evenly distributed around the circumference of the chuck, etc. Those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0045] In order to move the grinding assembly 7, the present invention adopts a driving assembly 6 including a frame 601 fixedly connected to the machine tool frame 1 by bolts, and a transverse plate 602 is slidably connected to the frame 601, and two symmetrical fixed plates 603 are fixedly connected to the two ends of the top outer wall of the frame 601 by bolts, and a rotating rod 604 is rotatably connected between the two fixed plates 603 on the same side, and two transmission wheels 605 are fixedly connected to the circumferential outer walls of the two rotating rods 604 by bolts. The two transmission wheels 605 in the two corresponding positions are connected by a transmission belt 606, and the transmission belt 606 located above the transverse plate 602 is fixed to the upper surface of the transverse plate 602 by a buckle 608. One side of one of the fixed plates 603 is fixedly connected by bolts to a driving motor 3 607 that makes the rotating rod 604 rotate forward and reverse along the axial direction.

[0046] It should be noted that the drive motor three 607 and the drive motor four 708 are existing technologies, and those skilled in the art can configure them according to actual needs, and they will not be described in detail here.

[0047] Specifically, while the grinding operation is in progress, the drive motor 3 607 is started to drive the rotating rod 604 to rotate. When the rotating rod 604 rotates, the transmission belt 606 is rotated through the transmission wheel 605 thereon. Since the transmission belt 606 and the transverse plate 602 are fixed on the transmission belt 606, the transverse plate 602 is driven to move back and forth along the frame 601 while rotating forward and reversely, thereby better grinding the shaft workpiece. At the same time, when the transverse plate 602 moves, the support plate 802 is driven to move through the arc frame 801. When the support plate 802 moves, the multiple rotating wheels 804 on the support frame 803 are moved synchronously, thereby lifting the shaft workpiece.

[0048] In order to grind shaft-type workpieces, the present invention adopts a grinding assembly 7 including a penetrating slide 701 that is slidably connected to the transverse plate 602. The bottom outer wall of the penetrating slide 701 is fixedly connected to two symmetrical V-frames 703 by bolts, and a protective shell 705 is fixedly connected between the two V-frames 703 by bolts. A grinding wheel 706 is rotatably connected between the inner walls of both sides of the protective shell 705 through a bearing. One end of the grinding wheel 706 shaft passes through the outer wall of one side of the protective shell 705 and is fixedly connected to a driven pulley 2 707 by bolts. A driving motor 4 708 is fixedly connected to the bottom inner wall of the penetrating slide 701 by bolts, and the output shaft end of the driving motor 4 708 is key-connected to the active pulley 2 709, and the active pulley 2 709 and the driven pulley 2 707 are also connected by belt drive. An electric push rod 3 702 is fixedly connected between the top inner wall of the penetrating slide 701 and the upper surface of the transverse plate 602 by bolts.

[0049] When in use, start the driving motor 4 708 to make the grinding wheel 706 rotate at high speed through the active pulley 2 709, the belt and the driven pulley 2 707, and wait for the grinding operation. Then start the electric push rod 3 702 to retract, thereby driving the grinding wheel 706 to move downward through the penetrating slide 701 until it contacts the shaft workpiece, and then the shaft workpiece can be ground.

[0050] It should be noted that the electric push rod 1 205 , the electric push rod 210 and the electric push rod 3 702 are all existing technologies, and those skilled in the art can configure them according to actual needs, which will not be described in detail here.

[0051] In order to solve the technical problem that long shaft workpieces are prone to vibration during processing, which affects the grinding accuracy, the present invention adopts a lifting assembly 8 including an arc frame 801 fixedly connected to one side of the transverse plate 602 by bolts, and the other end of the arc frame 801 is fixedly connected to a support plate 802 by bolts, and a support frame 803 is slidingly connected through the support plate 802, and rotating wheels 804 are rotatably connected to the four corners of the support frame 803, and a threaded hole 805 is opened on the support plate 802, and a threaded rod 806 is threadedly connected to the inner thread of the threaded hole 805, and one end of the threaded rod 806 is rotatably connected to the lower surface of the support frame 803 through a bearing.

[0052] When in use, the threaded rod 806 is rotated, and the support frame 803 is pushed upward while the threaded rod 806 rotates, so that the multiple rotating wheels 804 on the support frame 803 move upward until the rotating wheels 804 are in close contact with the circumferential outer wall of the shaft workpiece.

[0053] It actively offsets the bending deformation caused by gravity and grinding force, significantly reduces the vibration caused by centrifugal force, and thus significantly improves the processing accuracy and stability. The lifting component 8 and the grinding component 7 move synchronously, further ensuring that any position in the grinding process can be effectively supported.

[0054] Furthermore, by means of the threaded rod 806 and the threaded hole 805 , the height of the support frame 803 can be changed, thereby changing the height of the rotating wheel 804 , thereby adapting to shaft workpieces of different diameters and increasing the adaptability of the lifting assembly 8 .

[0055] It should be noted that in this application, an annular groove is axially provided on the inner wall of the threaded hole 805, and a nylon 66 damping ring with a Shore hardness of 85A is embedded in the groove. The continuous axial compression force generated by its elastic deformation forms an interference fit with a helix angle of 15°-20° with the surface of the threaded rod 806. When the threaded pair is subjected to axial vibration load, the nylon insert can generate a maximum elastic compression of 0.3mm, thereby increasing the friction coefficient between the thread contact surfaces from 0.15 to 0.68 (tested according to ASTM D1894 standard), effectively suppressing the loosening displacement caused by thread rebound.

[0056] The present invention is divided into the following steps when used: S1: When a shaft workpiece needs to be ground, the shaft workpiece to be ground is first placed on the lifting assembly 8. After the placement is completed, multiple electric push rods 205 are simultaneously started to extend, thereby pushing the U-shaped slide 204 to move upward along the H-shaped frame 203. The electric push rods 205 are further started to extend to the limit position. When the electric push rods 205 are extended to the limit position, the center plane between the two positioning wheels 212 coincides with the axis between the end fixing assembly 3 and the rotating fixing assembly 5; S2: Subsequently, multiple electric push rods 210 are simultaneously started to extend, and the connecting frame 208 is pushed to move by the slide plate 207 sliding in the U-shaped limit plate 206. When the connecting frame 208 moves, the positioning wheels 212 are driven by the bracket 211 to move toward the direction of the shaft workpiece. The multiple sets of positioning wheels 212 squeeze the shaft workpiece so that the axis of the shaft workpiece and the axes of the end fixing assembly 3 and the rotating fixing assembly 5 coincide with each other, thereby completing the positioning of the axis of the shaft workpiece; S3: After the axis of the shaft workpiece is positioned, the drive motor 1 404 is started to drive the screw rod 402 to rotate. During the rotation of the screw rod 402, the fixed block 401 is driven to move along the screw rod 402 toward the direction of the shaft workpiece; S4: When the fixed block 401 moves, the base plate 301 on it will be driven to move synchronously, and then the tapered ejector pin 307 on the slide frame 304 will be pushed toward the direction close to the shaft workpiece through the L-shaped seat 302 on the base plate 301 and the slide frame 304. After the tapered ejector pin 307 is embedded in the tapered groove at the end of the shaft workpiece, the shaft workpiece will be pushed to move. When the other end of the shaft workpiece is inserted into the three-jaw chuck three 501, the chuck wrench is used to rotate any one of the three bevel teeth on the circumference of the three-jaw chuck three 501, so that the three clamping jaws move toward the center together, thereby clamping and fixing one end of the shaft workpiece, thereby completing the installation of the shaft workpiece, and then rotating the threaded rod 806. When the threaded rod 806 rotates, the support frame 803 will be pushed upward, so that the multiple rotating wheels 804 on the support frame 803 move upward. The rotating wheels 804 are in close contact with the circumferential outer wall of the shaft workpiece; S5: After the installation of the shaft workpiece is completed, the electric push rod 1 205 and the electric push rod 2 210 are started to retract, thereby resetting the axis positioning assembly 2 to the initial position to avoid the position for the subsequent grinding operation. Then, the driving motor 2 502 is started to rotate the driven pulley 1 505 through the active pulley 1 504 and the belt. When the driven pulley 1 505 rotates, the three-jaw chuck 3 501 is rotated through the connecting shaft 503, thereby slowly rotating the shaft workpiece along the axis direction; S6: while the shaft workpiece is rotating, the drive motor 4 708 is started to rotate the grinding wheel 706 at high speed through the active pulley 2 709, the belt and the driven pulley 2 707, waiting for the grinding operation, and then the electric push rod 3 702 is started to retract, thereby driving the grinding wheel 706 to move downward through the penetrating slide 701 until it contacts the shaft workpiece, and then the shaft workpiece can be ground; S7: while the grinding operation is in progress, the driving motor 3 607 is started to drive the rotating rod 604 to rotate. When the rotating rod 604 rotates, the transmission belt 606 is rotated through the transmission wheel 605 thereon. Since the transmission belt 606 and the transverse plate 602 are fixed on the transmission belt 606, the transverse plate 602 is driven to move back and forth along the frame 601 while rotating in both directions, thereby better performing the grinding operation on the shaft workpiece. At the same time, when the transverse plate 602 moves, the support plate 802 is driven to move through the arc frame 801. When the support plate 802 moves, the multiple rotating wheels 804 on the support frame 803 are moved synchronously, thereby lifting the shaft workpiece. S8: When the end of the shaft workpiece does not have a tapered groove, remove the screw 311 to disengage it from the positioning hole 309. If the end of the shaft workpiece is tubular, slide the slide frame 304 downward to align the first positioning hole 309 on it with the through hole 310, and then install the screw 311. When fixing the end of the shaft, use a chuck wrench to rotate any one of the three bevel teeth on the circumference of the three-jaw chuck 1 306, so that the three clamping jaws move toward the outside of the circumference together, and fix the inner wall of the tube in an external support manner. If the shaft workpiece is solid, slide the slide frame 304 upward to align the third positioning hole 309 on it with the through hole 310, and then install the screw 311. When fixing the end of the shaft, use a chuck wrench to rotate any one of the three bevel teeth on the circumference of the three-jaw chuck 2 308, so that the three clamping jaws move toward the center together, thereby fixing one end of the shaft workpiece.

[0057] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A high-precision shaft workpiece grinding device, comprising a machine tool frame (1), characterized in that: A group of axis positioning components (2) for positioning the axis position of the shaft are provided on both sides of the machine tool frame (1); an end fixing component (3) for fixing one end of the shaft is slidably connected to the machine tool frame (1); a transverse movement component (4) for moving the end fixing component (3) along the machine tool frame (1) is provided in the machine tool frame (1); a rotating fixing component (5) for rotating the shaft is provided on the machine tool frame (1); a grinding component (7) for grinding a workpiece is provided on the machine tool frame (1) via a driving component (6); and a lifting component (8) for lifting the bottom of the shaft when it is ground is provided on the driving component (6).

2. A high-precision shaft workpiece grinding device according to claim 1, characterized in that: The axis positioning assembly (2) comprises guide rails (201) fixedly connected to both sides of the machine tool frame (1), two sliders (202) being slidably connected to the guide rails (201), an H-shaped frame (203) being fixedly connected to the upper surface of the slider (202), a U-shaped slide (204) being slidably connected to the H-shaped frame (203), an electric push rod (205) being fixedly connected between the U-shaped slide (204) and the H-shaped frame (203), and two symmetrical U-shaped limiting plates (206) being fixedly connected to the top inner wall of the U-shaped slide (204). The two U-shaped limit plates (206) are both slidably connected to a slide plate (207), one end of the two slide plates (207) is fixedly connected to a connecting frame (208), two symmetrical brackets (211) are fixedly connected to the connecting frame (208), and a positioning wheel (212) is rotatably connected between the inner walls of the two brackets (211) through a bearing, and the top outer wall of the U-shaped slide (204) is fixedly connected to an end plate (209), and an electric push rod (210) is fixedly connected between one side of the end plate (209) and one side of the connecting frame (208).

3. A high-precision shaft workpiece grinding device according to claim 1, characterized in that: The end fixing assembly (3) comprises a base plate (301) slidably connected to the machine tool frame (1); an L-shaped seat (302) is fixedly connected to the upper surface of the base plate (301); a square opening (303) is opened at one end of the L-shaped seat (302); a sliding frame (304) is slidably connected in the square opening (303); three mounting seats (305) are fixedly connected to the outer wall of one side of the sliding frame (304); one end of the three mounting seats (305) is respectively fixedly connected to a three-jaw chuck (306), a conical ejector pin (307) and a three-jaw chuck (308); and the three clamping jaws in the three-jaw chuck (306) are arranged in opposite directions.

4. A high-precision shaft workpiece grinding device according to claim 3, characterized in that: The sliding frame (304) is provided with positioning holes (309) corresponding to the positions of the three mounting seats (305), and one side of the L-shaped seat (302) is provided with a through hole (310) for use with the positioning hole (309), and a screw (311) for use with the through hole (310) and the positioning hole (309).

5. A high-precision shaft workpiece grinding device according to claim 4, characterized in that: The transverse movement assembly (4) includes a fixed block (401) fixedly connected to the lower surface of the base plate (301), a screw rod (402) is rotatably connected between the inner walls on both sides of the machine tool frame (1), the screw rod (402) passes through the fixed block (401) and is threadedly connected thereto, a guide rod (403) is fixedly connected between the inner walls on both sides of the machine tool frame (1) and located on both sides of the screw rod (402), both of the guide rods (403) pass through the fixed block (401) and are slidably connected thereto, and a driving motor (404) is fixedly connected to the outer wall of one side of the machine tool frame (1) for causing the screw rod (402) to rotate forward and reverse along the axial direction.

6. A high-precision shaft workpiece grinding device according to claim 2, characterized in that: The rotating fixed component (5) includes a three-jaw chuck three (501) rotatably connected to one side of the machine tool frame (1) through a bearing, a connecting shaft (503) is rotatably connected to the machine tool frame (1), and one end of the connecting shaft (503) is fixed to the three-jaw chuck three (501), and a driven pulley one (505) is fixedly connected to the circumferential outer wall of one end of the connecting shaft (503), and a driving motor two (502) is fixedly connected to the upper surface of the machine tool frame (1), and one end of the output shaft of the driving motor two (502) is fixedly connected to a driving pulley one (504), and the driving pulley one (504) and the driven pulley one (505) are connected by a belt transmission.

7. The high-precision shaft workpiece grinding device according to claim 1, characterized in that: The driving assembly (6) includes a frame (601) fixedly connected to the machine tool frame (1), a transverse plate (602) being slidably connected to the frame (601), two symmetrical fixed plates (603) being fixedly connected at both ends of the top outer wall of the frame (601), a rotating rod (604) being rotatably connected between the two fixed plates (603) on the same side, two transmission wheels (605) being fixedly connected to the circumferential outer walls of the two rotating rods (604), two sets of two transmission wheels (605) at corresponding positions being transmission-connected via a transmission belt (606), the transmission belt (606) located above the transverse plate (602) being fixed to the upper surface of the transverse plate (602) via a buckle (608), and a driving motor (607) for causing the rotating rod (604) to rotate forward and reverse along the axial direction being fixedly connected to one side of one of the fixed plates (603).

8. A high-precision shaft workpiece grinding device according to claim 7, characterized in that: The grinding assembly (7) includes a penetrating slide (701) that is slidably connected to the transverse plate (602), two symmetrical V-shaped frames (703) are fixedly connected to the outer wall of the bottom of the penetrating slide (701), a protective shell (705) is fixedly connected between the two V-shaped frames (703), and a grinding wheel (706) is rotatably connected between the inner walls of both sides of the protective shell (705) through a bearing, and one end of the shaft of the grinding wheel (706) passes through the outer wall of one side of the protective shell (705). The wall is fixedly connected to a driven pulley 2 (707), the bottom inner wall of the penetrating slide (701) is fixedly connected to a driving motor 4 (708), the output shaft end of the driving motor 4 (708) is key-connected to a driving pulley 2 (709), and the driving pulley 2 (709) and the driven pulley 2 (707) are also connected through a belt transmission, and an electric push rod 3 (702) is fixedly connected between the top inner wall of the penetrating slide (701) and the upper surface of the transverse plate (602).

9. The high-precision shaft workpiece grinding device according to claim 7, characterized in that: The lifting assembly (8) comprises an arc frame (801) fixedly connected to one side of the transverse plate (602); the other end of the arc frame (801) is fixedly connected to a supporting plate (802); a support frame (803) is slidably connected to the supporting plate (802); and rotating wheels (804) are rotatably connected to the four corners of the support frame (803).

10. The high-precision shaft workpiece grinding device according to claim 9, characterized in that: A threaded hole (805) is provided on the support plate (802), and a threaded rod (806) is connected to the inner thread of the threaded hole (805). One end of the threaded rod (806) is rotatably connected to the lower surface of the support frame (803) via a bearing.

Images