Automatic clamping mechanism and method for boring and milling of gearbox of large vertical mill

Abstract

The present invention discloses an automatic clamping mechanism and method for boring and milling of a large vertical milling machine gearbox, belonging to the technical field of machine tool parts processing, including a rough positioning clamping mechanism, a horizontal alignment support mechanism, an auxiliary support clamping mechanism, and a rough positioning auxiliary mechanism matched with the rough positioning clamping mechanism; the vertical auxiliary center plane of the rough positioning auxiliary mechanism is coplanar with the vertical center plane of the gearbox; the rough positioning clamping mechanism includes a support boss for supporting the bottom end surface of the rough positioning auxiliary mechanism and a rough positioning clamping part for clamping the rough positioning auxiliary mechanism; the horizontal alignment support mechanism includes two height-adjusting support rods for supporting the corresponding ends of the bottom end surface of the gearbox plate and capable of adjusting the support height. The present invention performs horizontal clamping of the milling machine gearbox blank, can perform automatic horizontal alignment, saves alignment time, reduces the labor intensity of the operator, and at the same time, the clamping is stable and the clamping force is sufficient.

Description

Technical Field

[0001] The invention belongs to the technical field of auxiliary equipment for machining gearboxes of grinding machines, and in particular relates to an automatic clamping mechanism and method for boring and milling machining of gearboxes of large vertical grinding machines. Background Art

[0002] The structure of the gearbox of a large vertical mill is as follows Figure 1 As shown, it comprises a cylindrical part 01 and a gear box plate 02 which are fixedly connected. The gear box plate 02 is a rectangular plate structure, wherein the central axis of the cylindrical part 01 and the central axis of the gear box plate 02 are collinear, collectively referred to as the central axis of the gear box 04. The four corners of the gear box plate 02 are provided with vertically penetrating box plate through holes 021. When the vertical mill gear box is placed horizontally, the vertical center plane 05 of the gear box is used as the symmetry plane. Two fin plates 03 extending in the radial direction of the cylindrical part 01 are respectively provided on the outer side wall of the cylindrical part 01 on both sides of the vertical center plane 05. The two fin plates 03 located on the same side of the vertical center plane 05 are symmetrical about the horizontal center plane 06 of the gear box. The fin plates 03 are provided with vertically penetrating fin plate through holes 031. The vertical center plane 05 of the gear box is perpendicular to the upper and lower end faces of the gear box plate 02, and the horizontal center plane 06 of the gear box is perpendicular to the front and rear end faces of the gear box plate 02.

[0003] When boring and milling the gearbox of the mill, in order to ensure that the machined surface is perpendicular to the boring bar, combined with the combined structural setting of the cylindrical part 01 and the gearbox plate 02 in the gearbox of the mill, when fixing the gearbox blank of the mill, it is necessary to ensure that the vertical center plane 05 in the gearbox of the mill is parallel to the boring bar, and the horizontal center plane 06 is parallel to the worktable of the boring and milling machine.

[0004] However, the combined structural setting of the cylindrical part 01 and the gear box plate 02 in the gear box of the grinding machine causes problems such as time-consuming leveling, unstable pressing, and insufficient pressing force when parallel positioning and pressing are performed on the worktable of the boring and milling machine, which can easily cause movement during the processing and affect normal processing operations. Summary of the invention

[0005] In order to solve the problems of time-consuming leveling, unstable clamping and insufficient clamping force in the existing clamping scheme of the gearbox of a large vertical mill, the present invention proposes an automatic clamping mechanism for boring and milling processing of the gearbox of a large vertical mill.

[0006] An automatic clamping mechanism for boring and milling of a large vertical mill gearbox, comprising a coarse positioning clamping mechanism for lateral support of a cylindrical portion, a horizontal alignment support mechanism for adjusting the horizontality of a horizontal center plane, an auxiliary support clamping mechanism for clamping a mill gearbox blank, and a coarse positioning auxiliary mechanism that cooperates with the coarse positioning clamping mechanism to achieve parallelism of a vertical center plane with a boring bar;

[0007] The coarse positioning clamping mechanism, the horizontal alignment support mechanism, and the auxiliary support clamping mechanism are fixedly arranged on the machine tool workbench; the coarse positioning auxiliary mechanism is fixedly arranged on the outer side wall of the cylindrical portion, and the vertical auxiliary center plane of the coarse positioning auxiliary mechanism parallel to the central axis of the gear box is coplanar with the vertical center plane of the gear box;

[0008] The coarse positioning and clamping mechanism comprises a supporting boss for supporting the bottom end surface of the coarse positioning auxiliary mechanism and a coarse positioning and clamping portion for clamping the coarse positioning auxiliary mechanism;

[0009] The horizontal alignment support mechanism includes two height-adjusting support rods which are used to support corresponding ends of the bottom end surface of the gear box plate and can adjust the support height.

[0010] Preferably, the auxiliary support and clamping mechanism includes an auxiliary clamping assembly and a clamping assembly; an auxiliary clamping assembly for supporting and clamping the corresponding fin plate on the lower side of the vertical center plane is arranged on each side of the coarse positioning and clamping mechanism, and a clamping assembly for use with the corresponding box plate through hole is arranged on the side of the height adjustment support rod facing the auxiliary clamping assembly.

[0011] Preferably, the coarse positioning auxiliary mechanism comprises an auxiliary seat for being fixedly connected to the outer side wall of the cylindrical portion, and an auxiliary support plate is fixedly arranged at one end of the auxiliary seat away from the cylindrical portion;

[0012] The bottom end surface of the auxiliary support plate is parallel to the horizontal center plane of the gear box.

[0013] Preferably, the coarse positioning and clamping mechanism comprises a coarse positioning base for fixedly connecting to the machine tool worktable, and the supporting boss is arranged on the top of the coarse positioning base;

[0014] The rough positioning and pressing part comprises a rotary oil cylinder arranged on a rough positioning base, and the piston rod end of the rotary oil cylinder is fixedly arranged to press a pressing plate on the top end surface of the auxiliary support plate.

[0015] Preferably, a pressure plate support block for supporting the pressure plate is fixedly arranged on the top end of the rough positioning base, and the pressure plate support block and the supporting boss are distributed on both sides of the piston rod of the rotary oil cylinder.

[0016] Preferably, a positioning assembly for roughly positioning the mill gearbox blank to achieve parallelism between the vertical center plane and the boring bar is provided between the rough positioning clamping mechanism and the rough positioning auxiliary mechanism;

[0017] The positioning assembly comprises a coarse positioning block fixedly arranged on one side of the coarse positioning base and a coarse positioning groove arranged on the auxiliary support plate and used to cooperate with the coarse positioning block;

[0018] A matching gap is reserved between the coarse positioning groove and the coarse positioning block as a horizontal center plane horizontal alignment adjustment space.

[0019] Preferably, the height adjustment support rod comprises a support seat fixedly arranged on the machine tool workbench, the upper part of the support seat is rotatably matched with a rotating nut, the inner hole thread of the rotating nut is matched with a support rod for supporting the gear box plate, the radial outer side wall of the rotating nut is a worm gear structure, the worm gear structure is adaptively connected to the worm, the worm is adaptively connected to the reducer and the servo motor; the reducer and the servo motor are arranged on the support seat;

[0020] A protective cover is arranged outside the rotating nut to protect the worm gear structure, the worm, the reducer and the servo motor.

[0021] Preferably, a circle of guide grooves is provided on the lower portion of the radial outer side wall of the rotating nut along the circumferential direction, and a bolt pin matching the guide groove is provided on the support seat.

[0022] Preferably, the auxiliary clamping assembly includes a first supporting top, a first clamping top, and a first clamping screw fixedly arranged on a machine tool workbench;

[0023] The top surface of the first support top is provided with a V-shaped support groove adapted to the right-angle edge of the bottom end of the corresponding fin plate;

[0024] A first pressing plate is arranged at the top end of the first pressing top, and a V-shaped pressing groove is arranged on the bottom surface of the end of the first pressing plate to form a fin pressing portion that can be clamped in the corresponding fin through hole;

[0025] The first pressing plate is provided with a first strip groove, the top end of the first pressing screw rod passes through the first strip groove upward, and a first pressing nut is threadedly matched on the first pressing screw rod at the upper part of the first strip groove.

[0026] Preferably, the clamping assembly comprises a second clamping top and a second clamping screw fixedly arranged on a machine tool workbench;

[0027] A second pressing plate is arranged at the top of the second pressing top, and the lower parts of the two side surfaces of the end of the second pressing plate are arc surface structures adapted to the inner wall surfaces of the corresponding box plate through holes;

[0028] The second pressing plate is provided with a second strip groove, the top end of the second pressing screw rod passes through the second strip groove upward, and the second pressing screw rod at the upper part of the second strip groove is threadedly matched with a second pressing nut.

[0029] The invention also provides an automatic clamping method for boring and milling processing of a gear box of a large vertical mill.

[0030] A large vertical milling machine gearbox boring and milling processing automatic clamping method is implemented by using a large vertical milling machine gearbox boring and milling processing automatic clamping mechanism, comprising the following steps:

[0031] Step S1, welding a rough positioning auxiliary mechanism to a rough workpiece of a milling machine gearbox;

[0032] Step S2, fixing the coarse positioning and clamping mechanism and the horizontal alignment support mechanism on the machine tool workbench according to preset positions;

[0033] Step S3, roughly positioning the blank workpiece of the grinding machine gearbox so that the vertical center plane of the gearbox is parallel to the boring bar;

[0034] Step S4, automatically adjusting the horizontal alignment of the blank workpiece of the gear box of the grinding machine;

[0035] Step S5, installing the auxiliary support and clamping mechanism on the machine tool workbench;

[0036] Step S6, pressing the rough workpiece of the mill gearbox;

[0037] Step S7: After clamping is completed, the subsequent processing operation begins.

[0038] The beneficial effects of the present invention are:

[0039] (1) The present invention performs horizontal clamping on the mill gearbox blank, and all subsequent processing operations can be performed after one clamping, thereby effectively improving the processing efficiency and ensuring the product processing accuracy.

[0040] (2) The coordination between the coarse positioning clamping mechanism and the coarse positioning auxiliary mechanism in the present invention can realize the coarse positioning of the grinding machine gear box blank on the machine tool, so that the vertical center plane of the gear box is parallel to the boring bar, ensuring the rapid alignment of the blank, improving the alignment speed, and shortening the alignment time.

[0041] (3) The horizontal alignment support mechanism of the present invention can automatically perform horizontal alignment adjustment on the blank workpiece of the grinding machine gear box, thereby avoiding the difficulty of manual alignment, saving alignment time, improving clamping efficiency, and reducing the labor intensity of the operator.

[0042] (4) The structural setting of the auxiliary clamping assembly in the present invention fully considers the structural characteristics of the fin plate on the blank workpiece. A V-shaped support groove is set on the top surface of the first support top to match the right-angle edge of the bottom end of the corresponding fin plate. A V-shaped pressing groove is set on the first pressing plate at the top end of the first clamping top, thereby forming a fin plate clamping portion that can be stuck in the through hole of the corresponding fin plate, ensuring that there is no slippage during clamping, and effectively ensuring the stability of the clamping; and the matching setting between the first clamping screw, the first clamping nut and the first pressing plate ensures that sufficient clamping force is provided to the cylindrical portion to solve the problem of insufficient clamping force.

[0043] (5) The clamping assembly in the present invention realizes the clamping of the gear box plate based on the corresponding box plate through holes on the gear box plate. In order to better ensure the clamping force, the lower parts of the two side surfaces of the second pressure plate end are set to an arc surface structure that is compatible with the inner wall surface of the corresponding box plate through holes, so as to facilitate the cooperation with the box plate through holes to achieve the purpose of clamping; and the cooperation between the second clamping screw, the second clamping nut and the second pressure plate ensures that sufficient clamping force is provided to the gear box plate to solve the problem of insufficient clamping force.

[0044] (6) The present invention is a universal tooling, and during batch processing, there is no need to repeatedly replace the tooling, thus shortening the product processing cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0046] Figure 1 It is a schematic structural stereogram of a large vertical mill gearbox;

[0047] Figure 2 It is a structural schematic diagram of the automatic clamping mechanism for boring and milling of a gearbox of a large vertical mill according to the present invention;

[0048] Figure 3 It is a structural schematic diagram of the coarse positioning auxiliary mechanism in the present invention;

[0049] Figure 4 It is a structural schematic diagram of the positioning component in the present invention;

[0050] Figure 5 It is a structural schematic diagram of the rough positioning and clamping mechanism in the present invention;

[0051] Figure 6 It is a schematic diagram of the structure of the height-adjusting support rod in the present invention;

[0052] Figure 7 It is a schematic diagram of the matching structure of the rotating nut, the worm, the reducer, and the servo motor in the present invention;

[0053] Figure 8 is a schematic structural stereogram of the rotating nut in the present invention;

[0054] Fig. 9 is a schematic cross-sectional view of the structure of the rotating nut in the present invention;

[0055] Fig.10 is a schematic structural stereogram of the auxiliary support and clamping mechanism of the present invention;

[0056] Fig.11 yes Fig.10 A-direction view;

[0057] Fig.12 yes Fig.10 B-direction view;

[0058] in:

[0059] 01-cylindrical part, 02-gear box plate, 021-box plate through hole, 03-fin plate, 031-fin plate through hole, 04-gear box center axis, 05-vertical center plane, 06-horizontal center plane;

[0060] 1-coarse positioning clamping mechanism, 11-supporting boss, 12-coarse positioning base, 13-rotating cylinder, 14-pressing plate, 15-key, 16-bolt, 17-pressing plate supporting block, 18-coarse positioning block;

[0061] 2-horizontal alignment support mechanism, 21-height adjustment support rod, 211-support seat, 212-rotating nut, 213-support rod, 214-worm, 215-reducer, 216-servo motor, 217-protective cover, 218-guide groove, 219-bolt pin;

[0062] 3-auxiliary support clamping mechanism, 31-auxiliary clamping assembly, 311-first support top, 312-first clamping top, 313-first clamping screw, 314-V-shaped support groove, 315-first pressing plate, 316-V-shaped pressing groove, 317-fin plate clamping part, 318-first clamping nut, 319-first strip groove, 32-clamping assembly, 321-second clamping top, 322-second clamping screw, 323-second pressing plate, 324-second strip groove, 325-second clamping nut;

[0063] 4 - coarse positioning auxiliary mechanism, 41 - auxiliary seat, 42 - auxiliary support plate, 43 - coarse positioning groove;

[0064] 5-Machine tool workbench;

[0065] 6-Product outline. DETAILED DESCRIPTION

[0066] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0067] Embodiment 1:

[0068] like Figure 2As shown, the automatic clamping mechanism for boring and milling of a large vertical grinding machine gearbox comprises a coarse positioning clamping mechanism 1 for laterally supporting the cylindrical portion 01, a horizontal alignment support mechanism 2 for adjusting the horizontality of the horizontal center plane 06, an auxiliary support clamping mechanism 3 for clamping the grinding machine gearbox blank, and a coarse positioning auxiliary mechanism 4 cooperating with the coarse positioning clamping mechanism 1 to achieve parallelism between the vertical center plane 05 and the boring bar; wherein the coarse positioning clamping mechanism 1, the horizontal alignment support mechanism 2, and the auxiliary support clamping mechanism 3 are fixedly arranged on the machine tool worktable 5, and the coarse positioning auxiliary mechanism 4 is fixedly arranged on the outer wall of the cylindrical portion 01. The vertical auxiliary center plane of the coarse positioning auxiliary mechanism 4 parallel to the central axis 04 of the gearbox is coplanar with the vertical center plane 05 of the gearbox. The installation position of the coarse positioning auxiliary mechanism 4 in this application is the best position for the cylindrical part 01 to support the force. After the coarse positioning auxiliary mechanism 4 is welded at this position, the stress of the workpiece is minimized and the deformation is no more than 5um. On the basis of effectively ensuring the support force of the cylindrical part 01 of the workpiece, the deformation of the workpiece is minimized, and the processing accuracy of the workpiece can be well guaranteed. The best position for the cylindrical part 01 to support the force is determined by finite element analysis, which is a prior art and will not be repeated here.

[0069] The coarse positioning and clamping mechanism 1 comprises a supporting boss 11 for supporting the bottom end surface of the coarse positioning auxiliary mechanism 4 and a coarse positioning and clamping portion for clamping the coarse positioning auxiliary mechanism 4;

[0070] The horizontal alignment support mechanism 2 includes two height-adjusting support rods 21 for supporting the corresponding ends of the bottom end surface of the gear box plate 02 and capable of adjusting the support height.

[0071] Specifically, the auxiliary support and clamping mechanism 3 includes an auxiliary clamping component 31 and a clamping component 32; an auxiliary clamping component 31 is arranged on each side of the coarse positioning and clamping mechanism 1 for supporting and clamping the corresponding fin plate 03 on the lower side of the vertical center plane 05, and a clamping component 32 is arranged on the side of the height adjustment support rod 21 facing the auxiliary clamping component 31 for use in conjunction with the corresponding box plate through hole 021.

[0072] like Figure 3 As shown, the coarse positioning auxiliary mechanism 4 includes an auxiliary seat 41 for fixedly connecting with the outer wall of the cylindrical part 01, and an auxiliary support plate 42 is fixedly arranged at one end of the auxiliary seat 41 away from the cylindrical part 01, and the bottom end surface of the auxiliary support plate 42 is parallel to the horizontal center plane 06 of the gear box. In the present application, the auxiliary seat 41 and the outer wall of the cylindrical part 01 are connected in the form of spot welding, which can effectively prevent deformation caused by welding.

[0073] like Figure 5As shown, the rough positioning and clamping mechanism 1 includes a rough positioning base 12 for fixed connection with the machine tool worktable 5, and a support boss 11 is arranged at the top of the rough positioning base 12; the rough positioning and clamping part includes a rotating oil cylinder 13 arranged on the rough positioning base 12, and the piston rod end of the rotating oil cylinder 13 is fixedly arranged to clamp the pressure plate 14 on the top surface of the auxiliary support plate 42. Specifically, the piston rod of the rotating oil cylinder 13 and the pressure plate 14 are matched and connected by a key 15 and fastened by a bolt 16. In addition, a pressure plate support block 17 for supporting the pressure plate 14 is fixedly arranged at the top of the rough positioning base 12, and the pressure plate support block 17 and the support boss 11 are distributed on both sides of the piston rod of the rotating oil cylinder 13.

[0074] In the present application, the coarse positioning clamping mechanism 1 is a component that provides lateral support for the cylindrical portion 01 in the workpiece, and is used in conjunction with the coarse positioning auxiliary mechanism 4, wherein the coarse positioning base 12 is a welded structure as a whole, and the setting of the support boss 11 makes the workpiece more stable and less deformed. Since the top area of ​​the support boss 11 is small, the contact between the support boss 11 and the auxiliary support plate 42 can be approximated as point contact, and the subsequent leveling can be approximated as rotation around the contact point; when the rotating cylinder 13 is started, the piston rod is extended and retracted during its rotation, thereby realizing the upward and downward movement of the pressure plate 14, so as to loosen or clamp the auxiliary support plate 42. After one end of the pressure plate 14 clamps the auxiliary support plate 42, the other end thereof is clamped on the pressure plate support block 17, thereby ensuring the force support of the rear part of the pressure plate 14 when it is clamped, so that the pressure of the pressure plate 14 is balanced, and the service life of the rotating cylinder 13 is ensured.

[0075] Specifically, a positioning assembly for roughly positioning the mill gearbox blank to achieve a vertical center plane 05 parallel to the boring bar is provided between the rough positioning clamping mechanism 1 and the rough positioning auxiliary mechanism 4; Figure 4 As shown, the positioning assembly includes a coarse positioning block 18 fixedly arranged on one side of the coarse positioning base 12 and a coarse positioning groove 43 arranged on the auxiliary support plate 42 for cooperating with the coarse positioning block 18, and a matching gap is left between the coarse positioning groove 43 and the coarse positioning block 18 as a horizontal alignment adjustment space for the horizontal center plane 06. In the present application, when the milling machine gearbox blank is placed according to the matching relationship between the coarse positioning groove 43 and the coarse positioning block 18, the vertical center plane 05 can be parallel to the boring bar when the blank falls, and the setting of the matching gap provides an adjustment space for the horizontal alignment of the horizontal center plane 06 in the milling machine gearbox blank workpiece.

[0076] Specifically, Figure 6-Figure 9As shown, the height adjustment support rod 21 includes a support seat 211 fixedly set on the machine tool worktable 5, and a rotating nut 212 is rotatably matched on the upper part of the support seat 211. The inner hole thread of the rotating nut 212 is matched with a support rod 213 for supporting the gear box plate 02. The radial outer wall of the rotating nut 212 is a worm gear structure, and the worm gear structure is adapted to be connected with the worm 214, and the worm 214 is adapted to be connected with the reducer 215 and the servo motor 216; a circle of guide grooves 218 are arranged on the lower part of the radial outer wall of the rotating nut 212 along the circumferential direction, and a bolt pin 219 matched with the guide groove 218 is arranged on the support seat 211. The cooperation between the guide groove 218 and the bolt pin 219 in the present application can ensure that the rotating nut 212 only rotates without causing displacement in the up and down directions, thereby pushing the support rod 213 to rise and fall, wherein the reducer 215 and the servo motor 216 are arranged on the support seat 211. In the present application, the worm gear structure is meshed with the worm 214, and the worm 214 is connected with the reducer 215 and the servo motor 216, so as to achieve the purpose of multi-stage deceleration and force enhancement. At the same time, the meshing structure of the worm gear has a self-locking function, which adds another layer of self-locking protection under the condition of thread self-locking, so as to ensure accurate positioning during height adjustment. The height adjustment support rod 21 in the present application plays the role of supporting the gear box plate 02 and adjusting the height of the corresponding end of the gear box plate 02 to perform horizontal alignment of the horizontal center plane 06.

[0077] In addition, a protective cover 217 is provided outside the rotating nut 212 to protect the worm gear structure, the worm 214 , the speed reducer 215 , and the servo motor 216 .

[0078] Specifically, Figure 10-11 As shown, the auxiliary clamping assembly 31 includes a first support top 311, a first clamping top 312, and a first clamping screw 313 fixedly arranged on the machine tool workbench 5;

[0079] A V-shaped support groove 314 is provided on the top surface of the first support top 311, which matches the right-angle edge of the bottom end of the corresponding fin plate 03;

[0080] A first pressing plate 315 is disposed at the top of the first pressing top 312, and a V-shaped pressing groove 316 is disposed on the bottom surface of the end of the first pressing plate 315 to form a fin pressing portion 317 that can be stuck in the corresponding fin through hole 031;

[0081] The first pressing plate 315 is provided with a first strip groove 319 , and the top end of the first pressing screw 313 passes through the first strip groove 319 upwards. The first pressing screw 313 at the upper part of the first strip groove 319 is threadedly engaged with a first pressing nut 318 .

[0082] Since the mill gearbox blank has no pressure point and cannot be clamped by a conventional pressure plate, the present application realizes the clamping of the cylindrical part 01 based on the fin plate through hole 031 on the fin plate 03 on the lower side of the horizontal center plane 06. When the horizontal center plane 06 of the mill gearbox blank is adjusted to be parallel to the machine tool worktable 5, the fin plate 03 on the lower side of the horizontal center plane 06 is inclined. The normal support top and pressure plate will generate oblique force on the inclined surface, causing the support and clamping to fail. According to the particularity of the fin plate 03 on the mill gearbox, the present application sets a V-shaped support groove 314 on the top surface of the first support top 311, which is adapted to the right-angle edge at the bottom end of the corresponding fin plate 03, and sets a V-shaped pressure groove 316 on the first pressure plate 315 at the top end of the first clamping top 312, thereby forming a fin plate clamping part 317 that can be stuck in the corresponding fin plate through hole 031, ensuring that no slippage occurs during clamping, and effectively ensuring the stability of the clamping. In the present application, the coordination between the first clamping screw 313, the first clamping nut 318 and the first pressure plate 315 ensures that sufficient clamping force is provided to the cylindrical portion 01 to solve the problem of insufficient clamping force.

[0083] like Fig.10 , Fig.12 As shown, the pressing assembly 32 includes a second pressing top 321 and a second pressing screw 322 fixedly arranged on the machine tool workbench 5;

[0084] A second pressing plate 323 is disposed at the top of the second pressing top 321, and the lower parts of the two side surfaces of the end of the second pressing plate 323 are arc-surface structures adapted to the inner wall surfaces of the corresponding box plate through holes 021;

[0085] The second pressing plate 323 is provided with a second strip groove 324 , and the top end of the second pressing screw 322 passes through the second strip groove 324 upwards. The second pressing screw 322 at the upper part of the second strip groove 324 is threadedly engaged with a second pressing nut 325 .

[0086] The present application realizes the compression of the gear box plate 02 based on the corresponding box plate through hole 021 on the gear box plate 02. In order to better ensure the compression force, the lower parts of the two side surfaces of the end of the second pressure plate 323 are set to be an arc surface structure that matches the inner wall surface of the corresponding box plate through hole 021, so as to facilitate the cooperation with the box plate through hole 021 to achieve the purpose of compression. The cooperation between the second compression screw 322, the second compression nut 325 and the second pressure plate 323 in the present application ensures that sufficient compression force is provided to the gear box plate 02 to solve the problem of insufficient compression force.

[0087] Embodiment 2:

[0088] The automatic clamping method for boring and milling of a gearbox of a large vertical mill is implemented by using the automatic clamping mechanism for boring and milling of a gearbox of a large vertical mill in Example 1, and comprises the following steps:

[0089] Step S1, welding the rough positioning auxiliary mechanism 4 to the rough workpiece of the gear box of the mill, and during welding, ensuring that the vertical auxiliary center plane of the rough positioning auxiliary mechanism 4 parallel to the center axis 04 of the gear box is coplanar with the vertical center plane 05 of the gear box;

[0090] Step S2, the coarse positioning and clamping mechanism 1 and the horizontal alignment support mechanism 2 are fixedly installed on the machine tool workbench 5 according to preset positions;

[0091] Step S3, roughly positioning the blank workpiece of the grinding machine gearbox so that the vertical center plane 05 of the gearbox is parallel to the boring bar;

[0092] By means of the lifting device, based on the coarse positioning block 18 on the coarse positioning clamping mechanism 1 and the coarse positioning groove 43 on the coarse positioning auxiliary mechanism 4, the rough workpiece of the gear box of the mill is placed on the top of the coarse positioning clamping mechanism 1 and the horizontal alignment support mechanism 2, so as to achieve the coarse positioning of the rough workpiece of the gear box of the mill, so that the vertical center plane 05 of the gear box is parallel to the boring bar;

[0093] Step S4, automatically adjusting the horizontal alignment of the blank workpiece of the gear box of the grinding machine;

[0094] When the milling machine gearbox blank workpiece is in an ideal clamping state, the theoretical coordinate values ​​of several points on the product circumference line 6 are detected to determine the theoretical position of the product circumference line 6 in the ideal clamping state; after the milling machine gearbox blank workpiece is roughly positioned and placed, the actual coordinate values ​​of the corresponding points on the product circumference line 6 are detected to determine the actual position of the product circumference line 6 after the rough positioning; the end of the gearbox plate 02 is raised or lowered according to the offset between the theoretical position and the actual position of the product circumference line 6;

[0095] After adjustment, the horizontal center plane 06 of the gearbox is parallel to the machine tool table 5 to ensure that the machining surface is perpendicular to the boring bar;

[0096] Specifically, a circular product circumference line 6 perpendicular to the central axis 04 of the gear box is determined in advance on the outer wall surface of one end of the cylindrical part 01 away from the gear box plate 02 as a positioning line, wherein when the blank workpiece of the grinding machine gear box is in an ideal clamping state, the product circumference line 6 is perpendicular to the boring bar;

[0097] When the milling machine gearbox blank workpiece is in an ideal clamping state, the machine tool probe is used to detect the theoretical coordinate values ​​of several points on the product contour 6. The theoretical coordinate values ​​of these points are pre-stored in the control system, and the theoretical circle equation of the product contour 6 is fitted based on these theoretical coordinate values;

[0098] After the rough positioning of the milling machine gearbox blank workpiece, the actual coordinate values ​​of the corresponding points on the product contour 6 are detected by the machine tool probe, and the actual coordinate values ​​are input into the control system. The control system will determine whether the input value is abnormal. If the difference between the actual coordinates and the theoretical coordinates of the corresponding points exceeds the set value, the control system will determine that the input value is wrong and require re-entry; the control system fits the actual circle equation of the product contour 6 according to the actual coordinate values ​​of these points;

[0099] According to the positional offset between the actual circle of the product circumference 6 and the theoretical circle, the end of the gear box plate 02 is raised or lowered; and the specific value of the raising or lowering is obtained by using the Pythagorean theorem and trigonometric function relationship according to the positional offset between the actual circle of the product circumference 6 and the theoretical circle and the size data of the blank workpiece; wherein the specific scheme of obtaining the height value that the end of the gear box plate 02 should be raised or lowered according to the positional offset between the actual circle of the product circumference 6 and the theoretical circle and the size data of the blank workpiece can be realized by using the existing technology, which will not be repeated here;

[0100] The control system drives the corresponding servo motor 216 to rotate, so that the two height adjustment support rods 21 adjust the heights of both ends of the gear box plate 02 accordingly;

[0101] After adjustment, the horizontal center plane 06 of the gear box is parallel to the machine tool table 5 to ensure that the processing surface is perpendicular to the boring bar.

[0102] Step S5, installing the auxiliary support and clamping mechanism 3 on the machine tool workbench 5;

[0103] Install the auxiliary clamping assembly 31 at the position corresponding to the fin plate 03 on the lower side of the vertical center plane 05, and install the clamping assembly 32 at the position corresponding to the box plate through hole 021;

[0104] Step S6, pressing the rough workpiece of the mill gearbox;

[0105] The rotary cylinder 13 is driven to cause the pressing plate 14 to press the top surface of the auxiliary support plate 42;

[0106] The V-shaped support groove 314 of the first support top 311 is supported on the right-angle edge at the bottom end of the corresponding fin plate 03, the fin plate pressing portion 317 at the end of the first pressing plate 315 is clamped in the corresponding fin plate through hole 031 and pressed, and the first clamping nut 318 is tightened to provide sufficient pressing force;

[0107] Insert the end of the second pressing plate 323 into the corresponding box plate through hole 021 and press it, and tighten the second clamping nut 325 to provide sufficient clamping force;

[0108] Step S7: After clamping is completed, the subsequent processing operation begins.

[0109] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not a limitation of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the protection scope of the present invention.

Claims

1. Automatic clamping mechanism for boring and milling of gearbox of large vertical mill, characterized by: The invention comprises a coarse positioning and clamping mechanism (1) for laterally supporting a cylindrical portion (01), a horizontal alignment support mechanism (2) for adjusting the horizontality of a horizontal center plane (06), an auxiliary support and clamping mechanism (3) for clamping a mill gearbox blank, and a coarse positioning auxiliary mechanism (4) for cooperating with the coarse positioning and clamping mechanism (1) to achieve parallelism between a vertical center plane (05) and a boring bar; The coarse positioning clamping mechanism (1), the horizontal alignment support mechanism (2), and the auxiliary support clamping mechanism (3) are fixedly arranged on the machine tool worktable (5); the coarse positioning auxiliary mechanism (4) is fixedly arranged on the outer wall of the cylindrical portion (01), and the vertical auxiliary center plane of the coarse positioning auxiliary mechanism (4) parallel to the central axis (04) of the gear box is coplanar with the vertical center plane (05) of the gear box; The coarse positioning clamping mechanism (1) comprises a supporting boss (11) for supporting the bottom end surface of the coarse positioning auxiliary mechanism (4) and a coarse positioning clamping portion for clamping the coarse positioning auxiliary mechanism (4); The horizontal alignment support mechanism (2) comprises two height-adjusting support rods (21) for supporting corresponding ends of the bottom end surface of the gear box plate (02) and capable of adjusting the support height; The auxiliary support clamping mechanism (3) comprises an auxiliary clamping assembly (31) and a clamping assembly (32); an auxiliary clamping assembly (31) for supporting and clamping the corresponding fin plate (03) on the lower side of the vertical center plane (05) is arranged on each side of the rough positioning clamping mechanism (1); a clamping assembly (32) for use in conjunction with the corresponding box plate through hole (021) is arranged on the side of the height adjustment support rod (21) facing the auxiliary clamping assembly (31); The coarse positioning auxiliary mechanism (4) comprises an auxiliary seat (41) for being fixedly connected to the outer wall of the cylindrical portion (01), and an auxiliary support plate (42) is fixedly arranged at one end of the auxiliary seat (41) away from the cylindrical portion (01); The bottom end surface of the auxiliary support plate (42) is parallel to the horizontal center plane (06) of the gear box; The coarse positioning and clamping mechanism (1) comprises a coarse positioning base (12) for being fixedly connected to a machine tool workbench (5), and the supporting boss (11) is arranged on the top of the coarse positioning base (12); The rough positioning and pressing part comprises a rotating oil cylinder (13) arranged on a rough positioning base (12), and the piston rod end of the rotating oil cylinder (13) is fixedly arranged to press a pressing plate (14) on the top end surface of the auxiliary support plate (42); A positioning assembly for roughly positioning the mill gearbox blank to achieve parallelism between the vertical center plane (05) and the boring bar is provided between the rough positioning clamping mechanism (1) and the rough positioning auxiliary mechanism (4); The positioning assembly comprises a coarse positioning block (18) fixedly arranged on one side of the coarse positioning base (12) and a coarse positioning groove (43) arranged on the auxiliary support plate (42) and used to cooperate with the coarse positioning block (18); a matching gap is left between the coarse positioning groove (43) and the coarse positioning block (18) as a horizontal alignment adjustment space for the horizontal center plane (06); The auxiliary pressing assembly (31) comprises a first supporting top (311), a first pressing top (312), and a first pressing screw rod (313) fixedly arranged on a machine tool workbench (5); A V-shaped support groove (314) is provided on the top surface of the first support top (311) and is matched with the right-angle edge of the bottom end of the corresponding fin plate (03); A first pressing plate (315) is arranged at the top end of the first pressing top (312), and a V-shaped pressing groove (316) is arranged on the bottom surface of the end of the first pressing plate (315) to form a fin pressing portion (317) that can be clamped in the corresponding fin through hole (031); A first strip groove (319) is provided on the first pressing plate (315), the top end of the first pressing screw rod (313) passes through the first strip groove (319) upwards, and a first pressing nut (318) is threadedly matched on the first pressing screw rod (313) at the upper part of the first strip groove (319); The pressing assembly (32) comprises a second pressing top (321) and a second pressing screw (322) fixedly arranged on a machine tool workbench (5); A second pressing plate (323) is disposed at the top end of the second pressing top (321), and the lower parts of the two side surfaces of the ends of the second pressing plate (323) are arc surface structures adapted to the inner wall surfaces of the corresponding box plate through holes (021); A second strip groove (324) is provided on the second pressing plate (323), the top end of the second pressing screw rod (322) passes through the second strip groove (324) upwards, and a second pressing nut (325) is threadedly engaged on the second pressing screw rod (322) at the upper part of the second strip groove (324).

2. The automatic clamping mechanism for boring and milling of gearbox of large vertical mill as claimed in claim 1, characterized in that: The height adjustment support rod (21) comprises a support seat (211) fixedly arranged on a machine tool worktable (5); a rotating nut (212) is rotatably matched on the upper part of the support seat (211); the inner hole thread of the rotating nut (212) is matched with a support rod (213) for supporting the gear box plate (02); the radial outer side wall of the rotating nut (212) is in a worm gear structure; the worm gear structure is adaptively connected to a worm (214); the worm (214) is adaptively connected to a reducer (215) and a servo motor (216); the reducer (215) and the servo motor (216) are arranged on the support seat (211); The rotating nut (212) is provided with a protective cover (217) on the outside for protecting the worm gear structure, the worm (214), the speed reducer (215), and the servo motor (216).

3. The automatic clamping mechanism for boring and milling of gearbox of large vertical mill as claimed in claim 2, characterized in that: A circle of guide grooves (218) are arranged along the circumferential direction on the lower portion of the radial outer side wall of the rotating nut (212), and a bolt pin (219) matching with the guide groove (218) is arranged on the support seat (211).

4. A method for automatically clamping a gearbox for a large vertical mill during boring and milling, which is implemented by using the automatic clamping mechanism for boring and milling a gearbox for a large vertical mill as claimed in any one of claims 1 to 3, characterized in that: The following steps are involved: Step S1, welding a rough positioning auxiliary mechanism (4) to a rough workpiece of a grinding machine gearbox; Step S2, fixing the coarse positioning and clamping mechanism (1) and the horizontal alignment support mechanism (2) on the machine tool workbench (5) according to preset positions; Step S3, roughly positioning the blank workpiece of the grinding machine gearbox so that the vertical center plane (05) of the gearbox is parallel to the boring bar; Step S4, automatically adjusting the horizontal alignment of the blank workpiece of the gear box of the grinding machine; Step S5, installing the auxiliary support and clamping mechanism (3) on the machine tool workbench (5); Step S6, pressing the rough workpiece of the mill gearbox; Step S7: After clamping is completed, the subsequent processing operation begins.

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