High-precision shaft workpiece grinding device

Abstract

The application relates to the technical field of shaft workpiece machining, and discloses a high-precision shaft workpiece grinding device, which comprises a machine tool frame, a group of shaft line positioning assemblies for positioning the shaft line positions of shafts are arranged on the two sides of the machine tool frame, an end fixing assembly for fixing one end of the shaft is slidably connected to the machine tool frame, a transverse moving assembly for moving the end fixing assembly along the machine tool frame is arranged in the machine tool frame, a rotary fixing assembly for rotating the shaft is arranged on the machine tool frame, and a grinding assembly for grinding the workpiece is arranged on the machine tool frame through a driving assembly. The application can accurately make the shaft line of the shaft workpiece coincide with the shaft lines of the two end fixing assemblies when the shaft workpiece is installed, effectively reduces the bending deformation caused by the self weight or clamping force in the installation process, significantly reduces the vibration caused by the centrifugal force, and improves the machining precision and stability.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of shaft workpiece machining, in particular to a high-precision shaft workpiece grinding device. BACKGROUND

[0002] In the field of precision machinery manufacturing, the machining precision of shaft workpieces directly affects the performance, service life and running stability of mechanical equipment. Such workpieces are usually required to have extremely high geometric precision and surface quality. In particular in the fields of aerospace, precision machine tools, medical devices and new energy vehicles, strict requirements are put forward for the size consistency, shape and position tolerance and surface integrity of shafts.

[0003] According to the search, the Chinese patent with the publication number CN107639478B discloses a long shaft workpiece intelligent grinding device. The device can achieve the purpose of overall grinding of the workpiece, automatic grinding throughout the process, eliminates grinding dead angles, and improves the grinding efficiency of the workpiece. However, there are still the following problems:

[0004] 1. When installing the shaft workpiece on the device, the manual carrying method is generally used for installation, and the end of the shaft workpiece needs to be clamped and fixed after being lifted and aligned by manual work. The visual precision of manual work cannot be guaranteed, and a large amount 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 to be solved.

[0005] 2. When grinding the shaft workpiece, the two-end clamping method is generally used for fixation. However, when facing a slender shaft, the middle part of the shaft will bend downward due to its own gravity, which is easy to vibrate during the rotation of the shaft, thereby causing deviation in the grinding result of the shaft workpiece. Therefore, how to solve the stability during the processing of the long shaft and ensure the grinding precision is an urgent problem to be solved.

[0006] 3. The two ends of the shaft are fixed by using conical pins, which can effectively ensure the stability of the shaft. However, not all processed shaft workpiece ends have conical grooves. In the case of solid shafts or tubular hollow shafts, this method is not applicable. Therefore, how to solve the stable clamping operation of different shaft workpieces is also an urgent problem to be solved. SUMMARY

[0007] In view of the defects of the prior art, the high-precision shaft workpiece grinding device is mainly used to solve the problem that the shaft workpiece is generally installed by manual carrying when being installed on the device, and the end of the shaft workpiece needs to be clamped and fixed after being manually lifted and aligned during clamping, the manual visual precision cannot be guaranteed, and a large amount of time is consumed during the process, thereby reducing the efficiency of the shaft workpiece installation, and the problem that the shaft workpiece is generally fixed by two-end pressing when being ground, but the middle part of the slender shaft is bent downward due to its own gravity, so that the shaft workpiece is prone to vibration during rotation, thereby causing deviation of the grinding result of the shaft workpiece, and the problem that the two ends of the shaft are fixed by using conical pins, although the stability of the shaft can be effectively ensured, but not all processed shaft workpieces have conical grooves, and this method is not applicable to solid shafts or tubular hollow shafts.

[0008] To achieve the above object, the present application provides the following technical scheme:

[0009] A high-precision shaft workpiece grinding device, comprising a machine tool frame, a group of shaft line positioning assemblies for positioning the shaft line position of the shaft workpiece are arranged on both sides of the machine tool frame, an end fixing assembly for fixing one end of the shaft workpiece is slidably connected to the machine tool frame, a horizontal moving assembly for moving the end fixing assembly along the machine tool frame is arranged in the machine tool frame, a rotating fixing assembly for rotating the shaft workpiece is arranged on the machine tool frame, a grinding assembly for grinding the workpiece is arranged on the machine tool frame through a driving assembly, and a lifting assembly for lifting the bottom of the shaft workpiece during grinding is arranged on the driving assembly.

[0010] Further, the shaft line positioning assembly comprises guide rails fixedly connected to both sides of the machine tool frame, two sliding blocks are slidably connected to the guide rails, an H-shaped frame is fixedly connected to the upper surface of the sliding blocks, a U-shaped carriage is slidably connected to the H-shaped frame, an electric push rod one is fixedly connected between the U-shaped carriage and the H-shaped frame, two symmetrical U-shaped limiting plates are fixedly connected to the top inner wall of the U-shaped carriage, two sliding plates are slidably connected in the two U-shaped limiting plates, a connecting frame is fixedly connected to one end of the two sliding plates, two symmetrical supports are fixedly connected to the connecting frame, a positioning wheel is rotatably connected between the inner walls on both sides of the two supports through a bearing, an end plate is fixedly connected to the top outer wall of the U-shaped carriage, and an electric push rod two is fixedly connected between one side of the end plate and one side of the connecting frame.

[0011] On the basis of the foregoing scheme, the end fixing assembly comprises a bottom plate slidingly connected to the machine tool frame, an L-shaped seat is fixedly connected to the upper surface of the bottom plate, a square hole is formed in one end of the L-shaped seat, a sliding frame is slidingly connected in the square hole, three mounting seats are fixedly connected to one side outer wall of the sliding frame, three-jaw chuck one, a conical center pin and three-jaw chuck two are respectively fixedly connected to one end of the three mounting seats, and the three clamping jaws in the three-jaw chuck one are oppositely arranged.

[0012] As a further scheme of the present application, positioning holes corresponding to the positions of the three mounting seats are formed in the sliding frame, a through hole is formed in one side of the L-shaped seat and is used in cooperation with the positioning holes, and a screw is used in cooperation with the positioning holes and the through hole.

[0013] Further, the horizontal moving assembly comprises a fixed block fixedly connected to the lower surface of the bottom plate, a lead screw is rotatably connected between the inner walls of the two sides of the machine tool frame, the lead screw passes through the fixed block and is threadedly connected thereto, guide rods are fixedly connected between the inner walls of the two sides of the machine tool frame and are located at positions on both sides of the lead screw, the two guide rods both pass through the fixed block and are slidingly connected thereto, and a driving motor one is fixedly connected to one side outer wall of the machine tool frame and is configured to positively and reversely rotate the lead screw along the axial direction.

[0014] On the basis of the foregoing scheme, the rotating fixing assembly comprises a three-jaw chuck three rotatably connected to one side of the machine tool frame through a bearing, a connecting shaft is rotatably connected to pass through the machine tool frame, one end of the connecting shaft is fixedly connected to the three-jaw chuck three, a driven pulley one is fixedly connected to the circumferential outer wall of one end of the connecting shaft, a driving motor two is fixedly connected to the upper surface of the machine tool frame, a driving pulley one is fixedly connected to one end of the output shaft of the driving motor two, and the driving pulley one and the driven pulley one are drivingly connected through a belt.

[0015] As a further scheme of the present application, the driving assembly comprises a frame body fixedly connected to the machine tool frame, a horizontal moving plate is slidingly connected to the frame body, two fixed plates symmetrically fixedly connected to the top outer walls of the frame body, a rotating rod rotatably connected between the two fixed plates on the same side, two transmission wheels fixedly connected to the circumferential outer walls of the two rotating rods, two transmission belts drivingly connected between the two transmission wheels at corresponding positions, the transmission belt located above the horizontal moving plate being fixedly connected to the upper surface of the horizontal moving plate through buckles, and a driving motor three fixedly connected to one side of one of the fixed plates and configured to positively and reversely rotate the rotating rod along the axial direction.

[0016] Further, the grinding assembly comprises a penetrating slide frame connected to the transverse plate through sliding, two V-shaped frames are fixedly connected to the outer wall of the bottom of the penetrating slide frame, a protective shell is fixedly connected between the two V-shaped frames, a grinding wheel is rotatably connected between the inner walls on the two sides of the protective shell through a bearing, one end of the grinding wheel shaft is fixedly connected to a driven pulley two through the outer wall of one side of the protective shell, a driving motor four is fixedly connected to the inner wall of the bottom of the penetrating slide frame, a driving pulley two is key-connected to the output shaft end of the driving motor four, and the driving pulley two and the driven pulley two are also connected through a belt transmission, and an electric push rod three is fixedly connected between the top inner wall of the penetrating slide frame and the upper surface of the transverse plate.

[0017] On the basis of the foregoing scheme, the lifting assembly comprises an arc-shaped frame fixedly connected to one side of the transverse plate, the other end of the arc-shaped frame is fixedly connected to a supporting plate, a supporting frame is slidably connected through the supporting plate, and rotating wheels are rotatably connected to the four corners of the supporting frame.

[0018] As a further scheme of the present application, a threaded hole is formed in the supporting plate, a threaded rod is threadedly connected in the threaded hole, and one end of the threaded rod is rotatably connected to the lower surface of the supporting frame through a bearing.

[0019] Compared with the prior art, the present application provides a high-precision shaft workpiece grinding device, which has the following advantages:

[0020] 1、The two groups of axis positioning assemblies arranged on the two sides of the machine tool frame can accurately make the axis of the shaft workpiece coincide with the axis of the two end fixing members when the shaft workpiece is installed, and manual alignment is not required when the shaft workpiece is installed, thereby effectively increasing the efficiency and precision of shaft workpiece installation.

[0021] 2、The lifting assembly can actively offset the bending deformation caused by gravity and grinding force, and significantly reduce the vibration caused by centrifugal force, thereby improving the machining precision and stability, and the lifting assembly and the grinding assembly move synchronously, thereby further ensuring that any position in the grinding process can be effectively supported.

[0022] 3、The end fixing assembly integrates the outer expanding three-jaw chuck one, the conical center pin and the inner clamping three-jaw chuck two, the sliding slide frame can be replaced when facing different shaft workpieces, and the end fixing assembly is applicable to different shaft workpieces and has a simple structure and is convenient to adjust according to actual conditions.

[0023] 4、The threaded rod and the threaded hole can change the height of the supporting frame, thereby changing the height of the rotating wheel, and thereby adapting to shaft workpieces of different diameters and increasing the adaptability of the lifting assembly.

[0024] 5、The electric push rod one and the electric push rod two that are equipped in the axial positioning assembly can move to two sides after the positioning of the axis is completed, avoid position of other parts during the grinding process, and avoid interference. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A front side perspective structural schematic view of the high-precision shaft workpiece grinding device is provided.

[0026] Figure 2 A rear side perspective structural schematic view of the high-precision shaft workpiece grinding device is provided.

[0027] Figure 3 An axial positioning assembly structural schematic view of the high-precision shaft workpiece grinding device is provided.

[0028] Figure 4 An end fixing assembly structural schematic view of the high-precision shaft workpiece grinding device is provided.

[0029] Figure 5 A grinding assembly structural schematic view of the high-precision shaft workpiece grinding device is provided. Figure 4 A partial enlarged structural schematic view of the high-precision shaft workpiece grinding device is provided.

[0030] Figure 6 A transverse moving assembly structural schematic view of the high-precision shaft workpiece grinding device is provided.

[0031] Figure 7 A rotating fixing assembly structural schematic view of the high-precision shaft workpiece grinding device is provided.

[0032] Figure 8 A driving assembly structural schematic view of the high-precision shaft workpiece grinding device is provided.

[0033] Figure 9 A partial enlarged structural schematic view of the high-precision shaft workpiece grinding device is provided. Figure 8 A grinding assembly structural schematic view of the high-precision shaft workpiece grinding device is provided.

[0034] Figure 10 A grinding assembly structural schematic view of the high-precision shaft workpiece grinding device is provided.

[0035] Figure 11 A lifting assembly structural schematic view of the high-precision shaft workpiece grinding device is provided.

[0036] In the figure: 1, machine tool frame; 2, axial positioning assembly; 201, guide rail; 202, sliding block; 203, H-shaped frame; 204, U-shaped carriage; 205, electric push rod one; 206, U-shaped limiting plate; 207, sliding plate; 208, connecting frame; 209, end plate; 210, electric push rod two; 211, support; 212, positioning wheel; 3, end fixing assembly; 301, bottom plate; 302, L-shaped seat; 303, square hole; 304, sliding frame; 305, mounting seat; 306, three-jaw chuck one; 307, conical center pin; 308, three-jaw chuck two; 309, positioning hole; 310, through hole; 311, screw; 4, horizontal moving assembly; 401, fixed block; 402, screw rod; 403, guide rod; 404, driving motor one; 5, rotary fixing assembly; 501, three-jaw chuck three; 502, driving motor two; 503, connecting shaft; 504, driving pulley one; 505, driven pulley one; 6, driving assembly; 601, frame body; 602, horizontal moving plate; 603, fixed plate; 604, rotating rod; 605, transmission wheel; 606, transmission belt; 607, driving 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, driving motor four; 709, driving pulley two; 8, lifting assembly; 801, arc-shaped frame; 802, supporting plate; 803, support frame; 804, rotating wheel; 805, threaded hole; 806, threaded rod. DETAILED DESCRIPTION

[0037] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the present application with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0038] The numbers of components in the text, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequence or technical meaning. The "connection" and "coupling" of the present application include direct and indirect connection (coupling) unless otherwise specified. In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientations or positional relationships shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as limiting the present application.

[0039] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in horizontal height than the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in horizontal height than the second feature.

[0040] Referring to Figures 1-11 As shown in the figure, a high-precision shaft workpiece grinding device, including machine tool frame 1, both sides of the machine tool frame 1 is provided with a group of shaft line positioning assembly 2 for positioning the shaft line position of the shaft, the machine tool frame 1 is slidably connected with the end of the shaft fixed end fixed assembly 3, the machine tool frame 1 is provided with a horizontal moving assembly 4 for moving the end fixed assembly 3 along the machine tool frame 1, the machine tool frame 1 is provided with a rotating fixed assembly 5 for rotating the shaft, the machine tool frame 1 is provided with a grinding assembly 7 for grinding the workpiece through the driving assembly 6, the driving assembly 6 is provided with a lifting assembly 8 for lifting the bottom of the shaft during grinding.

[0041] When the shaft workpiece is ground, the shaft workpiece is first placed on the lifting assembly 8, at this time the shaft line of the shaft workpiece is slightly lower than the shaft line between the end fixed assembly 3 and the rotating fixed assembly 5, then the shaft workpiece is extruded by the shaft line positioning assembly 2 on both sides of the machine tool frame 1, so that the shaft line of the shaft workpiece coincides with the shaft line between the end fixed assembly 3 and the rotating fixed assembly 5, then the end fixed assembly 3 is driven by the horizontal moving assembly 4 to push the shaft workpiece to move towards the rotating fixed assembly 5, until the shaft workpiece is fixed in the rotating fixed assembly 5, then reset the shaft line positioning assembly 2 for subsequent grinding operation, then start the grinding assembly 7 and make the grinding assembly 7 reciprocate on the surface of the shaft workpiece to grind, while the bottom of the shaft workpiece is lifted by the lifting assembly 8, the shaft workpiece is placed during the process, which produces vibration and affects the accuracy.

[0042] In order to solve the technical problem of the axis positioning of the shaft workpiece, the axis positioning assembly 2 comprises guide rails 201 fixedly connected on both sides of the machine tool frame 1 by bolts, two sliding blocks 202 slidingly connected on the guide rails 201, an H-shaped frame 203 fixedly connected on the upper surface of the sliding block 202 by bolts, a U-shaped sliding frame 204 slidingly connected on the H-shaped frame 203, an electric push rod one 205 fixedly connected between the U-shaped sliding frame 204 and the H-shaped frame 203 by bolts, two symmetrical U-shaped limiting plates 206 fixedly connected on the top inner wall of the U-shaped sliding frame 204 by bolts, two sliding plates 207 slidingly connected in the two U-shaped limiting plates 206, a connecting frame 208 fixedly connected on one end of the two sliding plates 207 by bolts, two symmetrical supports 211 fixedly connected on the connecting frame 208 by bolts, a positioning wheel 212 rotatably connected between the inner walls on both sides of the two supports 211 through bearings, an end plate 209 fixedly connected on the top outer wall of the U-shaped sliding frame 204 by bolts, and an electric push rod two 210 fixedly connected between one side of the end plate 209 and one side of the connecting frame 208 by bolts.

[0043] Through the electric push rod one 205 and the electric push rod two 210 arranged in the axis positioning assembly 2, the axis positioning assembly 2 can move to both sides after the positioning of the axis is completed, so as to avoid interference with other parts during the grinding process.

[0044] Specifically, the multiple electric push rod twos 210 are started at the same time to extend, the connecting frame 208 is pushed to move through the sliding plates 207 sliding in the U-shaped limiting plates 206, the positioning wheels 212 are driven to move towards the shaft workpiece through the supports 211 while the connecting frame 208 moves, and the shaft workpiece is extruded by the multiple groups of positioning wheels 212, so that the axis of the shaft workpiece coincides with the axis between the end fixing assembly 3 and the rotary fixing assembly 5, thereby completing the positioning of the axis of the shaft workpiece.

[0045] After the installation of the shaft workpiece is completed, the electric push rod one 205 and the electric push rod two 210 are started to retract, so that the axis positioning assembly 2 is reset to the initial position, thereby avoiding interference with subsequent grinding operations.

[0046] The two groups of axis positioning assemblies 2 arranged on both sides of the machine tool frame 1 can accurately make the axis of the shaft workpiece coincide with the axis of the end fixing assembly when the shaft workpiece is installed, so as to reduce the bending deformation caused by the weight or clamping force and ensure the straightness of the shaft in the full length range.

[0047] In order to solve the technical problem of fixing the end of various shaft workpieces, the end fixing assembly 3 comprises a bottom plate 301 slidably connected to the machine tool frame 1, an L-shaped seat 302 fixedly connected to the upper surface of the bottom plate 301 by bolts, a square hole 303 formed in one end of the L-shaped seat 302, a sliding frame 304 slidably connected in the square hole 303, three mounting seats 305 fixedly connected to one side outer wall of the sliding frame 304 by bolts, three-jaw chuck one 306, conical center pin 307 and three-jaw chuck two 308 fixedly connected to one end of the three mounting seats 305 respectively, and the three clamping jaws in the three-jaw chuck one 306 are oppositely arranged.

[0048] Further, positioning holes 309 corresponding to the positions of the three mounting seats 305 are formed in the sliding frame 304, a through hole 310 cooperating with the positioning holes 309 is formed in one side of the L-shaped seat 302, and a screw 311 cooperating with the positioning holes 309 and the through hole 310.

[0049] Specifically, the fixing block 401 moves while driving the bottom plate 301 on it to move synchronously, and then the L-shaped seat 302 and the sliding frame 304 on the bottom plate 301 push the conical center pin 307 on the sliding frame 304 to move towards the shaft workpiece, and after the conical center pin 307 is embedded in the conical groove at the end of the shaft workpiece, the shaft workpiece is pushed to move.

[0050] When the end of the shaft workpiece does not have a conical groove, the screw 311 is removed to disengage it from the positioning hole 309, if the end of the shaft workpiece is tubular, the sliding frame 304 is slid downward to align the first positioning hole 309 on it with the through hole 310, and then the screw 311 is installed, when fixing the end of the shaft, the chuck wrench is used to rotate any one of the three umbrella teeth on the circumference of the three-jaw chuck one 306, so that the three clamping jaws move together to the outside of the circumference, and the inner wall of the pipe is fixed by outward expansion.

[0051] If the shaft workpiece is solid, the sliding frame 304 is slid upward to align the third positioning hole 309 on it with the through hole 310, and then the screw 311 is installed, when fixing the end of the shaft, the chuck wrench is used to rotate any one of the three umbrella teeth on the circumference of the three-jaw chuck two 308, so that the three clamping jaws move together to the center, and then the end of the shaft workpiece is fixed.

[0052] The three-jaw chuck one 306, the conical center pin 307 and the three-jaw chuck two 308 are integrated, and the sliding frame 304 can be replaced when facing different shaft workpieces, and can be applied to different shaft workpieces, and the structure is simple and convenient to adjust according to actual conditions.

[0053] The horizontal moving assembly 4 comprises a fixed block 401 fixedly connected to the lower surface of the bottom plate 301, a lead screw 402 rotatably connected between the inner walls of the two sides of the machine tool frame 1, the lead screw 402 penetrating through the fixed block 401 and being threadedly connected with the fixed block 401, guide rods 403 fixedly connected between the inner walls of the two sides of the machine tool frame 1 and located at the positions on the two sides of the lead screw 402, the two guide rods 403 penetrating through the fixed block 401 and being slidably connected with the fixed block 401, and a drive motor one 404 fixedly connected to the outer wall of one side of the machine tool frame 1 and configured to reversibly drive the lead screw 402 to rotate along the axial direction.

[0054] It should be noted that the drive motor one 404 is a prior art, and a person skilled in the art can set it according to actual needs, which will not be described here.

[0055] Specifically, after the positioning of the axis of the shaft workpiece is completed, the drive motor one 404 is started to drive the lead screw 402 to rotate, and in the process of the rotation of the lead screw 402, the fixed block 401 is driven to move along the lead screw 402 towards the shaft workpiece.

[0056] In order to solve the technical problem of rotating the shaft workpiece, the rotating fixing assembly 5 comprises a three-jaw chuck three 501 rotatably connected to one side of the machine tool frame 1 through a bearing, a connecting shaft 503 rotatably penetrating through the machine tool frame 1 and fixedly connected to the three-jaw chuck three 501 at one end, a driven pulley one 505 fixedly connected to the circumferential outer wall of the one end of the connecting shaft 503 through a bolt, a drive motor two 502 fixedly connected to the upper surface of the machine tool frame 1 through a bolt, a driving pulley one 504 fixedly connected to the output shaft of the drive motor two 502 at one end, and the driving pulley one 504 and the driven pulley one 505 being drivingly connected through a belt.

[0057] It should be noted that the drive motor two 502 is a prior art, and a person skilled in the art can set it according to actual needs, which will not be described here.

[0058] Specifically, after 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 gears on the circumference of the three-jaw chuck three 501, so that the three clamping jaws move towards the center together, thereby clamping and fixing one end of the shaft workpiece, and thereby completing the installation of the shaft workpiece.

[0059] After the installation of the shaft workpiece is completed, the electric push rod one 205 and the electric push rod two 210 are started to retract, so that the axis positioning assembly 2 is reset to the initial position to avoid the subsequent grinding operation, and then the drive motor two 502 is started to drive the driving pulley one 504 and the belt to drive the driven pulley one 505 to rotate, and at the same time the three-jaw chuck three 501 is driven to rotate through the connecting shaft 503 when the driven pulley one 505 rotates, so that the shaft workpiece slowly rotates along the axial direction.

[0060] It should be noted that the three-jaw chuck is prior art, including the chuck body, the clamping jaw embedded in the T-shaped slot of the chuck, the small bevel gear and the large bevel gear in the square hole uniformly distributed on the circumference of the chuck, etc. Those skilled in the art can set it according to actual needs, which will not be repeated here.

[0061] In order to make the grinding assembly 7 move, the present application adopts the driving assembly 6 including the frame body 601 fixedly connected on the machine tool frame 1, the transverse plate 602 slidingly connected on the frame body 601, the two symmetrical fixed plates 603 fixedly connected on the top outer wall of the frame body 601, the rotating rod 604 rotatably connected between the two fixed plates 603 on the same side, the two transmission wheels 605 fixedly connected on the circumferential outer wall of the two rotating rods 604, the two transmission wheels 605 in corresponding positions being drivingly connected through the transmission belt 606, the transmission belt 606 above the transverse plate 602 being fixed on the upper surface of the transverse plate 602 through the buckle 608, and one side of the fixed plate 603 being fixedly connected with the driving motor three 607 for making the rotating rod 604 rotate in the axial direction.

[0062] It should be noted that the driving motor three 607 and the driving motor four 708 are prior art, and those skilled in the art can set them according to actual needs, which will not be repeated here.

[0063] Specifically, the driving motor three 607 is started to drive the rotating rod 604 to rotate while the grinding operation is carried out. The transmission belt 606 is rotated through the transmission wheel 605 on the rotating rod 604. Since the transmission belt 606 is fixed with the transverse plate 602, the transverse plate 602 is reciprocatingly moved along the frame body 601 while the transmission belt 606 rotates in the forward and reverse directions, so as to better grind the shaft workpiece. At the same time, the arc-shaped frame 801 drives the supporting plate 802 to move while the transverse plate 602 moves, and the plurality of rotating wheels 804 on the supporting frame 803 are synchronously moved while the supporting plate 802 moves, thereby lifting the shaft workpiece.

[0064] In order to grind the shaft workpiece, the grinding assembly 7 is adopted, which comprises a penetrating slide frame 701 slidably connected through the horizontal moving plate 602, two symmetrical V-shaped frames 703 fixedly connected to the outer wall of the bottom of the penetrating slide frame 701 by bolts, a protective shell 705 fixedly connected between the two V-shaped frames 703 by bolts, a grinding wheel 706 rotatably connected between the inner walls on the two sides of the protective shell 705 by bearings, a driven pulley two 707 fixedly connected to one end of the shaft of the grinding wheel 706 through the outer wall of one side of the protective shell 705 by bolts, a driving motor four 708 fixedly connected to the bottom inner wall of the penetrating slide frame 701 by bolts, a driving pulley two 709 key-connected to the output shaft end of the driving motor four 708, and the driving pulley two 709 and the driven pulley two 707 are also connected through the belt transmission, and an electric push rod three 702 is fixedly connected between the top inner wall of the penetrating slide frame 701 and the upper surface of the horizontal moving plate 602 by bolts.

[0065] When in use, the driving motor four 708 is started to make the grinding wheel 706 rotate at high speed through the driving pulley two 709, the belt and the driven pulley two 707, and the grinding operation is waited, and then the electric push rod three 702 is started to retract, so that the grinding wheel 706 is driven by the penetrating slide frame 701 to move downward to contact the shaft workpiece, and the grinding operation of the shaft workpiece can be performed.

[0066] It should be noted that the electric push rod one 205, the electric push rod two 210 and the electric push rod three 702 are all prior art, which can be set according to actual needs by those skilled in the art, and details are not repeated here.

[0067] In order to solve the technical problem that the shaft workpiece is easy to vibrate during the machining process and affects the grinding precision, the lifting assembly 8 is adopted, which comprises an arc-shaped frame 801 fixedly connected to one side of the horizontal moving plate 602 by bolts, a supporting plate 802 fixedly connected to the other end of the arc-shaped frame 801 by bolts, a supporting frame 803 slidably connected through the supporting plate 802, a rotating wheel 804 rotatably connected to each of the four corners of the supporting frame 803, a threaded hole 805 formed in the supporting plate 802, and a threaded rod 806 threadedly connected in the threaded hole 805, and one end of the threaded rod 806 is rotatably connected to the lower surface of the supporting frame 803 by a bearing.

[0068] When in use, the threaded rod 806 is rotated, and the supporting frame 803 is lifted up at the same time, so that the plurality of rotating wheels 804 on the supporting frame 803 move upward, and the rotating wheels 804 are in close contact with the circumferential outer wall of the shaft workpiece.

[0069] The bending deformation caused by the active counteracting of the gravity and the grinding force is significantly reduced, the vibration caused by the centrifugal force is significantly reduced, the machining precision and stability are significantly improved, the lifting assembly 8 and the grinding assembly 7 are synchronously moved, and the machining precision and stability are further ensured.

[0070] Further, by providing 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, and thereby the adaptability of the lifting assembly 8 to shaft workpieces of different diameters can be increased.

[0071] It should be noted that in the present application, the inner wall of the threaded hole 805 is provided with an annular groove in the axial direction, and a nylon 66 damping ring with a Shore hardness of 85A is embedded in the groove. The continuous axial compression force generated by the elastic deformation of the nylon 66 damping ring forms a 15°-20° helix angle interference fit with the surface of the threaded rod 806. When the threaded pair is subjected to axial vibration load, the nylon insert can produce an elastic compression of 0.3 mm, which can increase the friction coefficient between the threaded contact surfaces from 0.15 to 0.68 (according to the ASTM D1894 standard test), effectively inhibiting the loosening displacement caused by the rebound of the threads.

[0072] The present application is divided into the following steps when in use:

[0073] S1: When the shaft workpiece needs to be ground, first place the shaft workpiece to be ground on the lifting assembly 8, and simultaneously start the plurality of electric push rods 205 to extend and push the U-shaped carriage 204 to move upward along the H-shaped frame 203. Continue to extend the electric push rod 205 to the limit position, and when the electric push rod 205 is extended to the limit position, the central plane between the two positioning wheels 212 coincides with the axis between the end fixed assembly 3 and the rotating fixed assembly 5;

[0074] S2: Then simultaneously start the plurality of electric push rods 210 to extend and push the connecting frame 208 to move through the sliding plate 207 sliding in the U-shaped limiting plate 206. When the connecting frame 208 moves, the positioning wheels 212 will be driven by the support 211 to move towards the shaft workpiece. The plurality of positioning wheels 212 extrude the shaft workpiece to make the axis of the shaft workpiece coincide with the axis between the end fixed assembly 3 and the rotating fixed assembly 5, thereby completing the positioning of the axis of the shaft workpiece;

[0075] S3: After completing the positioning of the axis of the shaft workpiece, start the driving motor 404 to drive the lead screw 402 to rotate, which will drive the fixed block 401 to move along the lead screw 402 towards the shaft workpiece;

[0076] S4: While the fixed block 401 moves, the bottom plate 301 on it synchronously moves, and then the L-shaped seat 302 and the sliding frame 304 on the bottom plate 301 push the conical thimble 307 on the sliding frame 304 to move towards the shaft workpiece, and after the conical thimble 307 is embedded into the conical groove at the end of the shaft workpiece, the shaft workpiece is pushed to move, and when the other end of the shaft workpiece is inserted into the three-jaw chuck three 501, any one of the three umbrella teeth on the circumference of the three-jaw chuck three 501 is rotated by using the chuck wrench, so that the three clamping jaws move towards the center together, thereby clamping and fixing one end of the shaft workpiece, and then the threaded rod 806 is rotated, and while the threaded rod 806 rotates, the support frame 803 is lifted upwards, so that the plurality of rotating wheels 804 on the support frame 803 move upwards and tightly contact the circumferential outer wall of the shaft workpiece;

[0077] S5: After the installation of the shaft workpiece is completed, the electric push rod one 205 and the electric push rod two 210 are started to retract, so that the shaft line positioning assembly 2 is reset to the initial position to avoid the subsequent grinding operation, and then the driving motor two 502 is started to rotate the driven pulley one 505 through the driving pulley one 504 and the belt, and while the driven pulley one 505 rotates, the three-jaw chuck three 501 is rotated through the connecting shaft 503, so that the shaft workpiece slowly rotates along the shaft line direction;

[0078] S6: While the shaft workpiece rotates, the driving motor four 708 is started to rotate the grinding wheel 706 through the driving pulley two 709, the belt and the driven pulley two 707, and then the electric push rod three 702 is started to retract, so that the grinding wheel 706 is driven downwards by the penetrating slide 701 to contact the shaft workpiece, and the grinding operation of the shaft workpiece is completed;

[0079] S7: While the grinding operation is performed, the driving motor three 607 is started to rotate the rotating rod 604, and while the rotating rod 604 rotates, the transmission belt 606 is rotated through the transmission wheel 605 on it, and since the transmission belt 606 is fixed with the transverse plate 602, the transverse plate 602 reciprocatingly moves along the frame body 601 when the transmission belt 606 rotates in the forward and reverse directions, so that the grinding operation of the shaft workpiece is better, and at the same time, while the transverse plate 602 moves, the support frame 803 on the bracket 802 is moved through the arc-shaped bracket 801, so that the plurality of rotating wheels 804 on the support frame 803 synchronously move, thereby lifting the shaft workpiece;

[0080] S8: When the shaft workpiece end does not have a taper slot, the screw 311 is removed from the positioning hole 309, if the shaft workpiece end is tubular, the slide frame 304 is slid downward to align the first positioning hole 309 on the slide frame 304 with the through hole 310, then the screw 311 is installed, when fixing the shaft end, the chuck wrench is used to rotate any one of the three bevel gears on the circumference of the three-jaw chuck one 306, so that the three clamping jaws move outward together, and the inner wall of the pipe is fixed outward, if the shaft workpiece is solid, the slide frame 304 is slid upward to align the third positioning hole 309 on the slide frame 304 with the through hole 310, then the screw 311 is installed, when fixing the shaft end, the chuck wrench is used to rotate any one of the three bevel gears on the circumference of the three-jaw chuck two 308, so that the three clamping jaws move to the center, and then the end of the shaft workpiece is fixed.

[0081] The technical features of the above embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described, but it should be understood that any combination of the technical features is within the scope of the present disclosure as long as there is no contradiction.

[0082] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these are within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A high-precision grinding device for shaft workpieces, comprising a machine frame (1), characterized in that, Both sides of the machine tool frame (1) are provided with a group of axis positioning components (2) for positioning the axis position of the shaft, the machine tool frame (1) is slidably connected with an end fixing component (3) for fixing one end of the shaft, the machine tool frame (1) is provided with a transverse moving component (4) for moving the end fixing component (3) along the machine tool frame (1), the machine tool frame (1) is provided with a rotating fixing component (5) for rotating the shaft, and the machine tool frame (1) is provided with a grinding component (7) for grinding the workpiece through a driving component (6); the driving component (6) is provided with a lifting component (8) for lifting the bottom of the shaft during grinding; The axis positioning component (2) comprises guide rails (201) fixedly connected to both sides of the machine tool frame (1), two sliding blocks (202) slidably connected to the guide rails (201), an H-shaped frame (203) fixedly connected to the upper surface of the sliding block (202), a U-shaped sliding frame (204) slidably connected to the H-shaped frame (203), an electric push rod one (205) fixedly connected between the U-shaped sliding frame (204) and the H-shaped frame (203), two symmetrical U-shaped limiting plates (206) fixedly connected to the top inner wall of the U-shaped sliding frame (204), two sliding plates (207) slidably connected in the two U-shaped limiting plates (206), a connecting frame (208) fixedly connected to one end of the two sliding plates (207), two symmetrical supports (211) fixedly connected to the connecting frame (208), a positioning wheel (212) rotatably connected between the inner walls of the two supports (211), an end plate (209) fixedly connected to the top outer wall of the U-shaped sliding frame (204), and an electric push rod two (210) fixedly connected between one side of the end plate (209) and one side of the connecting frame (208). The driving component (6) comprises a frame body (601) fixedly connected to the machine tool frame (1), and a transverse moving plate (602) slidably connected to the frame body (601); The grinding component (7) comprises a penetrating sliding frame (701) slidably connected to the transverse moving plate (602); The lifting component (8) comprises an arc-shaped frame (801) fixedly connected to one side of the transverse moving plate (602), a supporting plate (802) fixedly connected to the other end of the arc-shaped frame (801), a supporting frame (803) slidably connected through the supporting plate (802), and four rotating wheels (804) rotatably connected to the four corners of the supporting frame (803).

2. The high-precision grinding device for shaft workpieces according to claim 1, characterized in that, The end fixing assembly (3) includes a bottom plate (301) slidably connected to the machine tool frame (1), the upper surface of the bottom plate (301) is fixedly connected with an L-shaped seat (302), one end of the L-shaped seat (302) is provided with a square opening (303), the square opening (303) is slidably connected with a sliding frame (304), one side outer wall of the sliding frame (304) is fixedly connected with three mounting seats (305), one end of each of the three mounting seats (305) is fixedly connected with a three-jaw chuck one (306), a conical center pin (307) and a three-jaw chuck two (308), respectively, three clamping jaws in the three-jaw chuck one (306) are oppositely arranged.

3. The high-precision shaft workpiece grinding device according to claim 2, characterized in that, A positioning hole (309) corresponding to each of the three mounting seats (305) is formed in the sliding frame (304), a through hole (310) matched with the positioning hole (309) is formed in one side of the L-shaped seat (302), and a screw (311) matched with the positioning hole (309) is arranged in the through hole (310).

4. The high-precision grinding device for shaft workpieces according to claim 3, characterized in that, The horizontal moving assembly (4) includes a fixed block (401) fixedly connected to the lower surface of the bottom plate (301), a lead screw (402) rotatably connected between the inner walls of the two sides of the machine tool frame (1), the lead screw (402) penetrating through the fixed block (401) and being threadedly connected therewith, guide rods (403) fixedly connected between the inner walls of the two sides of the machine tool frame (1) and located at positions on both sides of the lead screw (402), the two guide rods (403) penetrating through the fixed block (401) and being slidably connected therewith, and a drive motor one (404) fixedly connected to the outer wall of one side of the machine tool frame (1) and configured to reversibly drive the lead screw (402) to rotate along the axial direction.

5. The high-precision shaft workpiece grinding device according to claim 1, characterized in that, The rotating fixing assembly (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) rotatably connected to the machine tool frame (1) and fixedly connected to the three-jaw chuck three (501) at one end, a driven pulley one (505) fixedly connected to the circumferential outer wall of one end of the connecting shaft (503), a drive motor two (502) fixedly connected to the upper surface of the machine tool frame (1), a driving pulley one (504) fixedly connected to the output shaft of the drive motor two (502), and the driving pulley one (504) and the driven pulley one (505) being drivingly connected through a belt.

6. The high-precision shaft workpiece grinding device according to claim 1, characterized in that, The frame body (601) is fixedly connected with two symmetrical fixed plates (603) at both ends of the top outer wall, two rotating rods (604) are rotatably connected between the two fixed plates (603) on the same side, two transmission wheels (605) are fixedly connected to the circumferential outer walls of the two rotating rods (604), two transmission wheels (605) in corresponding positions are drivingly connected through a transmission belt (606), the transmission belt (606) located above the horizontal moving plate (602) is fixed to the upper surface of the horizontal moving plate (602) through buckles (608), and one side of one of the fixed plates (603) is fixedly connected with a drive motor three (607) configured to reversibly drive the rotating rod (604) to rotate along the axial direction.

7. The high-precision shaft workpiece grinding device according to claim 1, characterized in that, The bottom outer wall of the penetrating slide (701) is fixedly connected with two symmetrical V-shaped frames (703), the two V-shaped frames (703) are fixedly connected with a protective shell (705), the two side inner walls of the protective shell (705) are rotatably connected with a grinding wheel (706) through a bearing, one end of the grinding wheel (706) shaft is fixedly connected with a driven pulley two (707) penetrating through one side outer wall of the protective shell (705), the bottom inner wall of the penetrating slide (701) is fixedly connected with a driving motor four (708), the output shaft end of the driving motor four (708) is key-connected with a driving pulley two (709), and the driving pulley two (709) and the driven pulley two (707) are also connected through a belt drive, and the top inner wall of the penetrating slide (701) and the upper surface of the transverse moving plate (602) are fixedly connected with an electric push rod three (702).

8. The high-precision shaft workpiece grinding device according to claim 1, characterized in that, The supporting frame (803) is fixedly connected with a supporting plate (804), and the supporting plate (804) is fixedly connected with a supporting plate (804).

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