Milling device for cross recess of universal connecting shaft

Abstract

The invention relates to the technical field of cross recess milling, in particular to a universal connecting shaft cross recess milling device which comprises a case. A lifting platform and a base are mounted on the case; a hydraulic cylinder is rotationally mounted on the rotating base; a clamping block is fixedly mounted on the hydraulic cylinder; the case is provided with a tool apron; a positioning structure is arranged on the case and can drive the tool apron to be close to or away from the lifting table so as to drive the milling cutter to be close to the to-be-machined workpiece; a travelling crane structure is arranged on the case; the traveling structure can drive the cutter holder to reciprocate so as to drive the high-speed rotating milling cutter to travel according to a set track; a turnover structure is arranged on the machine box, and the turnover structure can drive the rotating base to rotate by 90 degrees and can drive the hydraulic cylinder to turn over by 180 degrees, so that the clamping blocks are driven to turn over synchronously, and a machined part is turned over; through the overturning structure, the offset distance between the intersection center of the longitudinal straight groove and the transverse straight groove and the central axis of the machined part can be reduced, so that the working efficiency of the universal connecting shaft is improved, and the machining efficiency can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cross-slot milling, and particularly to a milling device for the cross-slot of a universal joint shaft part. Background Technique

[0002] A universal joint shaft part is a device used to transmit power and allow a certain angular deviation between two shafts, commonly found in automotive drive systems, construction machinery, robot joints, etc. The cross-slot on the universal joint shaft part refers to the cross-shaped groove machined on the connecting shaft part (such as a flange fork or a cross shaft) (longitudinal straight grooves and transverse straight grooves are respectively milled on the two end faces of a cylindrical metal part, and the longitudinal straight grooves and the transverse straight grooves are perpendicular to each other).

[0003] In the machining of the cross-slot of a universal joint shaft part, the center deviation between the transverse slot and the vertical slot (i.e., the intersection point of the cross-slot deviates from the designed center position) will directly affect its function, service life and reliability. For example, it will lead to a reduction in transmission efficiency; local stress concentration (the deviation causes uneven contact between the cross shaft and the slot, and the contact stress is concentrated in a certain area, accelerating wear); an increase in frictional resistance (asymmetric force may cause vibration and increase energy loss (especially under high-speed working conditions)). The common machining of the cross-slot is completed by a milling device.

[0004] The milling device includes a clamping structure, a positioning traveling structure, a milling structure, etc.; during milling, the cylindrical metal column is fixed on the milling device through the clamping structure, and the milling structure is positioned and the milling stroke is controlled through the positioning traveling structure. A milling cutter is provided on the milling structure and can drive the milling cutter to rotate at a high speed. Through the mutual cooperation among the clamping structure, the positioning traveling structure and the milling structure, the machining of the cross-slot is completed.

[0005] Since the two mutually perpendicular straight grooves of the cross-slot are respectively arranged on the two end faces of the metal column, when machining with a common milling device, only the straight groove on one face can be machined first. After the machining is completed, the metal column is flipped 180° and rotated 90°, and then fixed on the milling device through the clamping structure to machine the straight groove on the other end face. After the metal column is flipped and rotated, it is necessary to re-position the metal column to ensure that the intersection point between the two straight grooves is located at the center position of the metal column; the position of the metal column deviates greatly during the flipping and rotating process, increasing the positioning difficulty and easily causing the intersection point of the cross-slot to deviate from the designed center position, resulting in poor machining quality and reducing the efficiency of machining the cross-slot. Summary of the Invention

[0006] The purpose of the present invention is to provide a milling device for the cross-slot of a universal joint shaft part to solve the problems raised in the above background technique.

[0007] To achieve the above purpose, the present invention provides the following technical solutions: A milling device for the cross groove of a universal connecting shaft part, comprising a machine case; A lifting table is slidably mounted on the machine case, and a rotating base is rotatably mounted; Two groups of hydraulic cylinders symmetrically arranged are rotatably mounted on the rotating base; A clamping block is fixedly mounted on the output end of the hydraulic cylinder; The machine case is provided with a tool holder for mounting a milling cutter; And the tool holder can drive the milling cutter to rotate at a high speed; A positioning structure is arranged on the machine case, and the positioning structure can drive the tool holder to approach or move away from the lifting table to drive the milling cutter to approach the workpiece to be processed; A traveling structure is arranged on the machine case; The traveling structure can drive the tool holder to reciprocate to drive the high-speed rotating milling cutter to travel along a set track; A flipping structure is arranged on the machine case, and the flipping structure can drive the rotating base to rotate 90°, and can drive the hydraulic cylinder to flip 180°, thereby driving the clamping block to flip synchronously to flip the workpiece.

[0008] As a further scheme of the present invention: The positioning structure includes multiple groups of columns fixedly mounted on the machine case; A transverse guide rail is arranged on the machine case; A sliding sleeve slidably fitted with the column is fixedly mounted on the transverse guide rail; A transverse lead screw column is rotatably mounted on the transverse guide rail; A transverse slider is slidably fitted on the transverse guide rail; A transverse thread sleeve threadedly connected with the transverse lead screw column is fixedly mounted on the transverse slider; The tool holder is connected with the transverse slider through a traveling structure.

[0009] As a further scheme of the present invention: The positioning structure further includes a vertical lead screw column rotatably mounted on the machine case; A vertical thread sleeve threadedly connected with the vertical lead screw column is fixedly mounted on the transverse guide rail.

[0010] As a further scheme of the present invention: The traveling structure includes a longitudinal guide rail fixedly mounted on the transverse slider; A longitudinal slider is slidably fitted on the longitudinal guide rail; The tool holder is fixedly connected with the longitudinal slider; A longitudinal lead screw column is rotatably mounted on the transverse slider; A longitudinal thread sleeve threadedly connected with the longitudinal lead screw column is fixedly mounted on the longitudinal slider.

[0011] As a further scheme of the present invention: The flipping structure includes a worm rotatably mounted on the machine case; A worm wheel meshing with the worm is fixedly mounted on the rotating base.

[0012] As a further scheme of the present invention: The flipping structure further includes a first bevel gear fixedly connected with the hydraulic cylinder; A second bevel gear meshing with the first bevel gear is fixedly mounted on the machine case.

[0013] As a further solution of the present invention: a driving motor is fixedly installed on the chassis, and a fixed turntable is fixedly installed on the output end of the driving motor; a plurality of first tooth blocks are fixedly installed on the fixed turntable; a sliding turntable is slidably fitted on the worm; a plurality of second tooth blocks that can engage with the first tooth blocks are fixedly installed on the sliding turntable; a first spring is sleeved on the worm, and two ends of the first spring respectively abut against the sliding turntable and the worm.

[0014] As a further solution of the present invention: a telescopic column is fixedly installed on the transverse guide rail; a telescopic sleeve that is slidably fitted with the telescopic column is fixedly installed on the chassis; a connecting rod is rotatably installed on the sliding turntable; a wedge block that is slidably fitted with the telescopic sleeve is fixedly installed on the connecting rod; a contact block that abuts against the wedge block is slidably fitted in the telescopic sleeve; a second spring is arranged in the telescopic sleeve, and two ends of the second spring respectively abut against the telescopic column and the contact block.

[0015] As a further solution of the present invention: an annular baffle is fixedly installed on the rotary base.

[0016] As a further solution of the present invention: symmetrically arranged hatch doors are slidably fitted on the chassis.

[0017] Compared with the prior art, the beneficial effects of the present invention are: through the flipping structure, the offset distance between the intersection center of the longitudinal straight groove and the transverse straight groove and the central axis of the workpiece can be reduced, thereby improving the working efficiency of the universal joint shaft; and through the flipping structure, during the process of machining one workpiece, it is possible to avoid performing multiple operations: clamping, releasing, positioning, resetting, and workpiece center positioning; thereby reducing the programming amount of the control system, greatly avoiding the probability of conflicts between various function programs, thereby improving the practicability of the device and reducing the subsequent maintenance frequency; and can effectively improve the machining efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of an embodiment of a milling device for the cross groove of a universal joint shaft part.

[0019] Figure 2 It is a schematic structural diagram of a lifting table in an embodiment of a milling device for the cross groove of a universal joint shaft part.

[0020] Figure 3 For Figure 2 The structural diagram at position A in

[0021] Figure 4 It is a schematic structural diagram of a column in an embodiment of a milling device for the cross groove of a universal joint shaft part.

[0022] Figure 5 ForFigure 4 Structural schematic diagram from another perspective.

[0023] Figure 6 Structural schematic diagram of the transverse guide rail in an embodiment of a milling device for the cross groove of a universal joint shaft.

[0024] Figure 7 Structural schematic diagram of the clamping block in an embodiment of a milling device for the cross groove of a universal joint shaft.

[0025] Figure 8 Structural schematic diagram of the worm gear and worm in an embodiment of a milling device for the cross groove of a universal joint shaft.

[0026] Figure 9 For Figure 8 Structural schematic diagram at position B in

[0027] Figure 10 Structural schematic diagram of the fixed turntable and the sliding turntable in an embodiment of a milling device for the cross groove of a universal joint shaft.

[0028] In the figure: 1, chassis; 101, hatch; 102, column; 2, lifting platform; 3, rotating base; 301, annular baffle; 302, worm gear; 4, hydraulic cylinder; 401, first bevel gear; 5, clamping block; 6, second bevel gear; 7, driving motor; 8, fixed turntable; 801, first tooth block; 9, sliding turntable; 901, second tooth block; 10, first spring; 11, connecting rod; 1101, wedge block; 12, worm; 13, transverse guide rail; 1301, vertical thread sleeve; 1302, sliding sleeve; 14, vertical lead screw column; 15, transverse slider; 1501, transverse thread sleeve; 16, transverse lead screw column; 17, longitudinal guide rail; 18, longitudinal slider; 1801, longitudinal thread sleeve; 19, longitudinal lead screw column; 20, tool holder; 21, telescopic column; 22, telescopic sleeve; 23, second spring; 24, abutting block. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] In addition, the elements in the present invention are referred to as "fixed to" or "disposed on" another element, and it can be directly on another element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation manners.

[0031] Please refer to Figures 1 to 10 , in the embodiment of the present invention, a milling device for a cross groove of a universal joint shaft member includes a machine case 1; A lifting table 2 is slidably mounted on the machine case 1 and a rotating base 3 is rotatably mounted; Two groups of hydraulic cylinders 4 symmetrically arranged are rotatably mounted on the rotating base 3; A clamping block 5 is fixedly mounted on the output end of the hydraulic cylinder 4; The machine case 1 is provided with a tool holder 20 for mounting a milling cutter; and the tool holder 20 can drive the milling cutter to rotate at a high speed; A positioning structure is provided on the machine case 1, and the positioning structure can drive the tool holder 20 to approach or move away from the lifting table 2 to drive the milling cutter to approach the workpiece to be processed; A traveling structure is provided on the machine case 1; the traveling structure can drive the tool holder 20 to reciprocate to drive the high-speed rotating milling cutter to travel along a set track; A flipping structure is provided on the machine case 1, and the flipping structure can drive the rotating base 3 to rotate 90° and can drive the hydraulic cylinder 4 to flip 180°, thereby driving the clamping block 5 to flip synchronously to flip the workpiece.

[0032] Taking the embodiment combined with all the features recorded in this application as an example, when in use, the workpiece to be processed is placed on the lifting table 2; The lifting table 2 can rise or fall in the machine case 1, and the rising or falling distance can be controlled by the control system. According to the length of the workpiece, the moving stroke of the lifting table 2 is adjusted.

[0033] Two hydraulic cylinders 4 work synchronously through a control system to drive two clamping blocks 5 closer or farther away from each other, thereby clamping the workpiece on the lifting table 2; the control system controls the distance of the lifting table 2 to rise or fall, so that the clamping blocks 5 can clamp the middle part of the workpiece, thus avoiding the phenomenon of tool collision during milling, so as to avoid damage to the device; and after the clamping blocks 5 clamp the workpiece, the lifting table 2 will descend in the chassis 1, so as to separate from the workpiece, avoiding the lifting table 2 from hindering the flipping of the workpiece during subsequent milling.

[0034] Reasonably select a milling cutter according to the workpiece and processing requirements, and fixedly install the milling cutter on the tool holder 20; the tool holder 20 can drive the milling cutter to rotate at a high speed to meet the milling requirements.

[0035] The control system controls the positioning structure to act, thereby driving the tool holder 20 to move horizontally and vertically in the transverse direction of the chassis 1, so as to drive the tool holder 20 to reach the best initial processing position, thereby reducing the difficulty and loss during the milling of the milling cutter.

[0036] The control system controls the action and trajectory of the traveling structure, thereby driving the tool holder 20 to move horizontally in the longitudinal direction of the chassis 1, so as to mill a longitudinal straight groove on one side end face of the workpiece.

[0037] After that, the control system controls the positioning structure to act, so as to drive the tool holder 20 away from the workpiece to facilitate the action of the flipping structure and avoid the phenomenon of tool collision.

[0038] The flipping structure drives the rotating base 3 to rotate 90°. During the rotation of the rotating base 3, the hydraulic cylinder 4 will rotate 180°, so as to flip the workpiece, so that the longitudinal straight groove is flipped to the lower end, and the unprocessed side end face is flipped to the upper end, and it will drive the workpiece to rotate at a right angle, so as to facilitate the subsequent processing of milling a transverse straight groove perpendicular to the longitudinal straight groove on the unprocessed side end face.

[0039] After the flipping structure acts, the control system controls the positioning structure and the traveling structure to act to process the transverse straight groove of the workpiece.

[0040] The flipping structure can reduce the offset distance between the intersection center of the longitudinal straight groove and the transverse straight groove and the central axis of the workpiece, thereby improving the working efficiency of the universal joint shaft; and through the flipping structure, it is possible to avoid performing multiple operations during the processing of one workpiece: clamping, releasing, positioning, resetting, and workpiece center positioning; thereby reducing the programming amount of the control system and greatly avoiding the probability of conflicts between various function programs, thus improving the practicability of the device and reducing the subsequent maintenance frequency.

[0041] In another embodiment of the present invention, the positioning structure includes multiple groups of columns 102 fixedly installed on the chassis 1; a transverse guide rail 13 is provided on the chassis 1; a sliding sleeve 1302 that is slidably fitted with the columns 102 is fixedly installed on the transverse guide rail 13; a transverse lead screw column 16 is rotatably installed on the transverse guide rail 13; a transverse slider 15 is slidably fitted on the transverse guide rail 13; a transverse threaded sleeve 1501 that is threadedly connected to the transverse lead screw column 16 is fixedly installed on the transverse slider 15; the tool holder 20 is connected to the transverse slider 15 through a traveling structure.

[0042] In another embodiment of the present invention, the positioning structure further includes a vertical lead screw column 14 rotatably installed on the chassis 1; a vertical threaded sleeve 1301 that is threadedly connected to the vertical lead screw column 14 is fixedly installed on the transverse guide rail 13.

[0043] Taking the embodiment combined with all the features described in this application as an example, when in use, the transverse lead screw column 16 is connected to a transverse driving device on the guide rail; the transverse driving device is controlled by a control system to act, thereby driving the transverse lead screw column 16 to rotate.

[0044] When the transverse lead screw column 16 rotates, it can drive the transverse threaded sleeve 1501 to move horizontally along the length direction of the transverse lead screw column 16 through threaded cooperation, thereby driving the transverse slider 15 to move synchronously, and thereby driving the tool holder 20 to move synchronously through the traveling structure; and the moving stroke is controlled according to the actual situation of the workpiece and the milling requirements. And when the transverse lead screw column 16 stops rotating, through threaded cooperation, the position of the transverse threaded sleeve 1501 is fixed, thereby fixing the position of the transverse slider 15, so as to prevent the position of the tool holder 20 from shifting due to the extrusion force between the high-speed rotating milling cutter and the workpiece during the milling process, thereby reducing the processing quality and even damaging the device.

[0045] The vertical lead screw column 14 is connected to a vertical driving device, and by controlling the vertical driving device to act through a control system, the vertical lead screw column 14 can be driven to rotate.

[0046] The rotating vertical lead screw column 14 can drive the vertical threaded sleeve 1301 to move along the length direction of the vertical lead screw column 14 through threaded cooperation, thereby driving the transverse guide rail 13 to move synchronously, and thereby driving the tool holder 20 to approach or move away from the lifting table 2 through the traveling structure; the control system adjusts the moving stroke of the transverse guide rail 13 according to the actual situation of the workpiece and the milling requirements, so as to improve the processing quality.

[0047] When the vertical lead screw column 14 stops rotating, through the threaded fit, the position of the vertical threaded sleeve 1301 is fixed, so that the vertical height of the tool holder 20 and the lifting table 2 is fixed, thereby avoiding the offset of the position of the tool holder 20 caused by the extrusion force between the high-speed rotating milling cutter and the workpiece during the milling process, so as to improve the processing quality and protect the device from damage.

[0048] In another embodiment of the present invention, the traveling structure includes a longitudinal guide rail 17 fixedly installed on the transverse slider 15; a longitudinal slider 18 is slidably fitted on the longitudinal guide rail 17; the tool holder 20 is fixedly connected to the longitudinal slider 18; a longitudinal lead screw column 19 is rotatably installed on the transverse slider 15; a longitudinal threaded sleeve 1801 threadedly connected to the longitudinal lead screw column 19 is fixedly installed on the longitudinal slider 18.

[0049] Taking the embodiment combined with all the features described in this application as an example, when in use, a longitudinal driving device connected to the longitudinal lead screw column 19 is fixedly installed on the transverse slider 15; the longitudinal driving device is controlled by the control system to drive the longitudinal lead screw column 19 to rotate.

[0050] The rotating longitudinal lead screw column 19 can drive the longitudinal threaded sleeve 1801 to move along the length direction of the longitudinal lead screw column 19 through the threaded fit, so as to drive the longitudinal slider 18 to move on the longitudinal guide rail 17, thereby driving the tool holder 20 to move synchronously.

[0051] The control system controls the movement trajectory of the tool holder 20 according to the actual situation of the workpiece and the milling requirements, so as to control the movement trajectory of the milling cutter on the end face of the workpiece. Through reasonable design, the processing quality can be improved.

[0052] Through the threaded fit between the longitudinal lead screw column 19 and the longitudinal threaded sleeve 1801, and by controlling the rotation speed of the longitudinal lead screw column 19 through the control system, the movement speed of the tool holder 20 is controlled, so as to control the milling speed of the milling cutter, which can effectively improve the milling quality and reduce the wear amount of the milling cutter. And through the threaded fit, the extrusion force between the high-speed rotating milling cutter and the workpiece can be offset, thereby improving the milling quality.

[0053] In another embodiment of the present invention, the flipping structure includes a worm 12 rotatably installed on the chassis 1; a worm gear 302 meshing with the worm 12 is fixedly installed on the rotating base 3.

[0054] Taking the embodiment combined with all the features described in this application as an example, when in use, after the longitudinal straight groove on the end face of the side of the workpiece close to the milling cutter is milled, through the cooperation of the positioning structure and the traveling structure, the milling cutter is moved away from the workpiece, so as to avoid the phenomenon of tool collision.

[0055] Afterwards, the control system is used to control the rotation of the worm 12. Through the meshing action, the worm wheel 302 is driven to rotate, thereby driving the rotating base 3 to rotate, and further driving the two groups of hydraulic cylinders 4 and the clamping blocks 5 to rotate synchronously. During the rotation process, the clamping block 5 maintains the clamping of the workpiece, thus preventing the dislocation of the workpiece.

[0056] By controlling the meshing between the worm 12 and the worm wheel 302 through the control system, the rotation angle of the rotating base 3 can be accurately controlled, so as to achieve a 90° rotation, making the subsequent processed horizontal straight groove and vertical straight groove perpendicular to each other, thereby improving the working efficiency of the universal joint shaft.

[0057] In another embodiment of the present invention, the flipping structure further includes a first bevel gear 401 fixedly connected to the hydraulic cylinder 4; a second bevel gear 6 is fixedly installed on the chassis 1 and meshes with the first bevel gear 401.

[0058] Taking the embodiment combined with all the features described in this application as an example, when in use, when the rotating base 3 rotates, it will drive the hydraulic cylinder 4 to rotate synchronously, thereby driving the first bevel gear 401 to rotate synchronously along the central axis of the rotating base 3.

[0059] During the synchronous rotation of the first bevel gear 401 with the rotating base 3, the first bevel gear 401 meshes with the second bevel gear 6, thereby driving the first bevel gear 401 to rotate along the central axis of the hydraulic cylinder 4.

[0060] By controlling the meshing of the first bevel gear 401 and the second bevel gear 6, when the rotating base 3 rotates 90°, the first bevel gear 401 can rotate 180°, thus realizing the flipping of the workpiece.

[0061] The flipping structure can reduce the offset distance between the intersection center of the longitudinal straight groove and the horizontal straight groove and the central axis of the workpiece, thereby improving the working efficiency of the universal joint shaft; and through the flipping structure, it is possible to avoid repeatedly performing the operations of clamping, releasing, positioning, resetting, and workpiece center positioning during the processing of one workpiece; thereby reducing the programming amount of the control system and greatly avoiding the probability of conflicts between various function programs, thus improving the practicability of the device and reducing the subsequent maintenance frequency.

[0062] In another embodiment of the present invention, a driving motor 7 is fixedly installed on the chassis 1. A fixed turntable 8 is fixedly installed at the output end of the driving motor 7; a plurality of first tooth blocks 801 are fixedly installed on the fixed turntable 8; a sliding turntable 9 is slidably fitted on the worm 12; a plurality of second tooth blocks 901 that can engage with the first tooth blocks 801 are fixedly installed on the sliding turntable 9; a first spring 10 is sleeved on the worm 12; both ends of the first spring 10 abut against the sliding turntable 9 and the worm 12 respectively.

[0063] In another embodiment of the present invention, a telescopic column 21 is fixedly installed on the transverse guide rail 13; a telescopic sleeve 22 that is slidably fitted with the telescopic column 21 is fixedly installed on the chassis 1; a connecting rod 11 is rotatably installed on the sliding turntable 9; a wedge block 1101 that is slidably fitted with the telescopic sleeve 22 is fixedly installed on the connecting rod 11; a contact block 24 that abuts against the wedge block 1101 is slidably fitted in the telescopic sleeve 22; a second spring 23 is arranged in the telescopic sleeve 22; and two ends of the second spring 23 respectively abut against the telescopic column 21 and the contact block 24.

[0064] Taking the embodiment in which all the features described in this application are combined as an example, when the driving motor 7 operates, it can drive the fixed turntable 8 to rotate.

[0065] In the initial state, multiple groups of first tooth blocks 801 and multiple groups of second tooth blocks 901 are engaged with each other. Therefore, when the fixed turntable 8 rotates, it can drive the sliding turntable 9 to rotate through the engagement between the first tooth blocks 801 and the second tooth blocks 901, thereby driving the worm 12 to rotate, and thereby driving the flipping structure to act, so as to realize the flipping of the workpiece.

[0066] When the positioning structure drives the transverse guide rail 13 to approach the workpiece, it will drive the telescopic column 21 to move inward in the telescopic sleeve 22, thereby compressing the second spring 23. As the compression amount of the second spring 23 gradually increases, its elastic force also gradually increases, so that the extrusion force between the contact block 24 and the wedge block 1101 also becomes larger and larger.

[0067] Moreover, the elastic force of the first spring 10 acts on the sliding turntable 9, and thus acts on the wedge block 1101 through the connecting rod 11.

[0068] When the elastic force of the second spring 23 is greater than the elastic force of the first spring 10, the contact block 24 will squeeze the wedge block 1101, causing it to slide in the telescopic sleeve 22, thereby driving the sliding turntable 9 to move away from the fixed turntable 8 through the connecting rod 11, and continuing to compress the first spring 10.

[0069] After the first tooth block 801 and the second tooth block 901 are separated, the rotation of the fixed turntable 8 will not be able to drive the sliding turntable 9 to rotate, and thus will not be able to drive the worm 12 to rotate, so that the position of the workpiece is kept fixed.

[0070] When the longitudinal straight groove on one end face of the workpiece is milled, the positioning structure will drive the transverse guide rail 13 to move away from the workpiece, thereby driving the milling cutter to move away from the workpiece, so as to facilitate the flipping of the workpiece and avoid tool collision.

[0071] During this process, the telescopic column 21 will move outwards within the telescopic sleeve 22, thereby reducing the compression of the second spring 23 to reduce the elastic force of the second spring 23. Until after the telescopic column 21 moves outwards by a certain distance, the elastic force of the second spring 23 becomes zero; at this time, the elastic force of the first spring 10 will drive the sliding turntable 9 closer to the fixed turntable 8, so that the first tooth block 801 and the second tooth block 901 are re-engaged; at the same time, the connecting rod 11 drives the wedge block 1101 to slide, so that the abutting block 24 is reset.

[0072] By controlling the height of the horizontal guide rail 13, the cooperation state between the fixed turntable 8 and the sliding turntable 9 is controlled, so as to ensure that when the vertical distance between the milling cutter and the workpiece is small, the flipping structure will not move accidentally, thereby reducing the probability of tool collision.

[0073] In another embodiment of the present invention, an annular baffle 301 is fixedly installed on the rotating base 3.

[0074] Taking the embodiment in which all the features described in this application are combined as an example, during use, the annular baffle 301 blocks the waste produced during the milling process, avoiding the waste from splashing everywhere and polluting the device, thereby improving the service life of the device and reducing the cleaning work.

[0075] In another embodiment of the present invention, symmetrically arranged hatch doors 101 are slidably fitted on the chassis 1.

[0076] Taking the embodiment in which all the features described in this application are combined as an example, during milling, after the high-speed rotating milling cutter contacts the workpiece, the workpiece has a large dynamic potential energy, and this dynamic potential energy is offset by being clamped by the clamping block 5; when the clamping block 5 cannot clamp firmly, the workpiece with a large kinetic energy may fly out of the chassis 1, which has a large potential danger; during processing, by closing the hatch door 101, the operator can be effectively protected from harm.

[0077] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0078] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only an independent technical solution. This narrative style of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A milling device for a cross groove of a universal joint shaft, comprising a chassis (1); It is characterized in that The chassis (1) is provided with a lifting platform (2) slidably mounted thereon and a rotating base (3) rotatably mounted thereon; two groups of symmetrically arranged hydraulic cylinders (4) are rotatably mounted thereon; and a clamping block (5) is fixedly mounted on the output end of the hydraulic cylinder (4); The chassis (1) is provided with a cutter seat (20) for mounting a milling cutter; and the cutter seat (20) is capable of driving the milling cutter to rotate at high speed; The chassis (1) is provided with a positioning structure, and the positioning structure can drive the tool holder (20) to move closer to or away from the lifting platform (2), so as to drive the milling cutter closer to the workpiece to be processed; The chassis (1) is provided with a crane structure; the crane structure is capable of driving the tool holder (20) to move back and forth, thereby driving the high-speed rotating milling cutter to move along a set trajectory; The chassis (1) is provided with a flipping structure, which can drive the rotating base (3) to rotate 90 degrees and can drive the hydraulic cylinder (4) to flip 180 degrees, thereby driving the clamping block (5) to flip synchronously, thereby flipping the workpiece.

2. A milling device for a cross groove of a universal joint shaft according to claim 1, characterized in that: The positioning structure comprises a plurality of groups of columns (102) fixedly mounted on the chassis (1); a transverse guide rail (13) is provided on the chassis (1); a sliding sleeve (1302) slidably engaged with the column (102) is fixedly mounted on the transverse guide rail (13); a transverse screw column (16) is rotatably mounted on the transverse guide rail (13); a transverse slider (15) is slidably engaged with the transverse guide rail (13); a transverse threaded sleeve (1501) threadedly connected to the transverse screw column (16) is fixedly mounted on the transverse slider (15); and the tool holder (20) is connected to the transverse slider (15) via a crane structure.

3. A milling device for a cross groove of a universal joint shaft according to claim 2, characterized in that: The positioning structure further comprises a vertical screw column (14) rotatably mounted on the chassis (1); a vertical threaded sleeve (1301) threadably connected to the vertical screw column (14) is fixedly mounted on the transverse guide rail (13).

4. A milling device for a cross groove of a universal joint shaft according to claim 3, characterized in that: The crane structure comprises a longitudinal guide rail (17) fixedly mounted on the transverse slider (15); a longitudinal slider (18) slidably engaged on the longitudinal guide rail (17); the tool holder (20) is fixedly connected to the longitudinal slider (18); a longitudinal screw column (19) is rotatably mounted on the transverse slider (15); and a longitudinal threaded sleeve (1801) threadedly connected to the longitudinal screw column (19) is fixedly mounted on the longitudinal slider (18).

5. The milling device for the cross groove of a universal joint shaft according to claim 2, characterized in that: The flip structure comprises a worm (12) rotatably mounted on the chassis (1); a worm wheel (302) meshing with the worm (12) is fixedly mounted on the rotating base (3).

6. A milling device for a cross groove of a universal joint shaft according to claim 5, characterized in that: The tilting structure further comprises a first bevel gear (401) fixedly connected to the hydraulic cylinder (4); and a second bevel gear (6) meshing with the first bevel gear (401) is fixedly mounted on the chassis (1).

7. A milling device for a cross groove of a universal joint shaft according to claim 6, characterized in that: A driving motor (7) is fixedly mounted on the chassis (1); a fixed turntable (8) is fixedly mounted on the output end of the driving motor (7); a plurality of groups of first tooth blocks (801) are fixedly mounted on the fixed turntable (8); a sliding turntable (9) is slidably engaged with the worm (12); a plurality of groups of second tooth blocks (901) that can engage with the first tooth blocks (801) are fixedly mounted on the sliding turntable (9); a first spring (10) is sleeved on the worm (12); and two ends of the first spring (10) are respectively in contact with the sliding turntable (9) and the worm (12).

8. A milling device for a cross groove of a universal joint shaft according to claim 7, characterized in that: A telescopic column (21) is fixedly mounted on the transverse guide rail (13); a telescopic sleeve (22) slidably engaged with the telescopic column (21) is fixedly mounted on the chassis (1); a connecting rod (11) is rotatably mounted on the sliding turntable (9); a wedge block (1101) slidably engaged with the telescopic sleeve (22) is fixedly mounted on the connecting rod (11); a resisting block (24) slidably engaged in contact with the wedge block (1101) is slidably engaged in the telescopic sleeve (22); a second spring (23) is arranged in the telescopic sleeve (22); two ends of the second spring (23) respectively resist the telescopic column (21) and the resisting block (24).

9. A milling device for a cross groove of a universal joint shaft according to claim 1, characterized in that: An annular baffle (301) is fixedly mounted on the rotating base (3).

10. The milling device for the cross groove of a universal joint shaft according to claim 1, characterized in that: The chassis (1) is slidably engaged with a symmetrically arranged cabin door (101).

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