Double power head type high speed inner circle turning machine tool for crank shaft

Abstract

The application relates to the technical field of crankshaft machining, and discloses a double-power-head type crankshaft high-speed internal circle turning machine tool, which comprises a workbench, two machining devices for machining inclined oil holes are symmetrically arranged on the workbench, and a clamping mechanism is arranged on the workbench. The clamping mechanism comprises two mounting seats which are fixedly connected on the workbench in a symmetrical mode, connecting shafts are rotationally connected to the mounting seats in a damping mode, a centering assembly is connected between the two connecting shafts, and a positioning assembly for positioning and clamping a crankshaft is connected to the centering assembly. The double-power-head type crankshaft high-speed internal circle turning machine tool can effectively solve the problems that, in the prior art, when a traditional turning machining method is used to machine an inclined oil hole of a crankshaft, the spindle angle of a machining device needs to be adjusted for multiple times or the crankshaft needs to be re-clamped, resulting in low machining precision and efficiency; and when a numerical control machining center is used to machine the inclined oil hole of the crankshaft, the cost of a tool is high, the tool depends on professional operation and maintenance, and the economy is poor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of crankshaft machining, in particular to a double-power-head type crankshaft high-speed internal circular turning machine tool. BACKGROUND

[0002] The crankshaft, as a core rotating component of an engine, has a structure including a main shaft neck, a connecting rod shaft neck, a crank arm, a balance weight and an oil hole, and mainly functions to convert the reciprocating linear motion of a piston into rotary motion to realize power output. The inclined oil hole is an oil hole structure with a specific inclination angle provided on the main shaft neck, the connecting rod shaft neck or the crank arm, and plays an important role in conveying lubricating oil from the main shaft neck to the connecting rod shaft neck. The machining precision and quality of the inclined oil hole are directly related to the lubrication efficiency and service life of the crankshaft.

[0003] The current inclined oil hole machining process mainly includes two types: one is a traditional turning machine tool machining process, which uses a clamp and a center rest to position and clamp the crankshaft, adjusts the inclination angle of the main shaft of the machine tool, and sequentially completes drilling, boring and chamfering processes. The advantage of this process is that the equipment investment cost is relatively low. However, it is limited by the need for multiple adjustments of the main shaft angle or re-clamping of the crankshaft during the machining process, resulting in relatively low machining precision and production efficiency. The other is a numerical control machining center machining process, which uses a five-axis linkage numerical control system to clamp the crankshaft on the machining center table and realizes accurate machining of the inclined oil hole through three-dimensional space coordinate linkage. This process can complete the machining of multiple inclined oil holes at one time, significantly reducing the clamping frequency, effectively improving the production efficiency while ensuring high precision machining requirements. However, it is limited by the high cost of special tools and strict requirements for the skill level of operators and equipment maintenance, resulting in high overall machining cost. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the present application provides a double-power-head type crankshaft high-speed internal circular turning machine tool, which can effectively solve the problems of the prior art, such as the need for multiple adjustments of the main shaft angle of the machining device or re-clamping of the crankshaft when machining the inclined oil hole of the crankshaft by traditional turning, resulting in low machining precision and efficiency, and the high cost of tools and dependence on professional operation and maintenance when machining the inclined oil hole of the crankshaft by numerical control machining center, which is not economical.

[0005] To achieve the above-mentioned purposes, the present application is realized by the following technical solutions:

[0006] The present application provides a double-power-head type crankshaft high-speed internal circular turning machine tool, which includes:

[0007] A workbench is provided on the workbench, and two machining devices for machining inclined oil holes are symmetrically arranged on the workbench.

[0008] The clamping mechanism comprises two mounting seats symmetrically fixedly connected on the workbench, a connecting shaft rotationally connected on the mounting seat, and a centering assembly commonly connected between the two connecting shafts.

[0009] The overturning mechanism comprises a mounting rod rotationally connected on the workbench through a connecting seat, a forward-reverse motor fixedly connected on one end of the mounting rod, a linkage assembly connected at the middle position of the mounting rod and capable of driving the connecting shaft to rotate, and a supporting assembly symmetrically connected on both ends of the mounting rod and capable of keeping the positioning assembly horizontal.

[0010] Further, the centering assembly comprises two mounting plates symmetrically arranged above and below, and the two mounting plates are connected with the connecting shaft through two groups of scissors plates symmetrically arranged front and back.

[0011] Further, the upper mounting plate is designed in two sections and rotationally connected between the two sections, two fixing frames are symmetrically arranged on both sides of the mounting plate, the fixing frame is also designed in two sections and comprises an L-shaped frame and a horizontal frame slidingly connected on the vertical section of the L-shaped frame, the L-shaped frame and the lower mounting plate are slidingly connected through the front and back symmetrically arranged connecting plates, and the horizontal frame and the upper mounting plate are also slidingly connected through the front and back symmetrically arranged connecting plates.

[0012] Further, the scissors plate is composed of two symmetrically arranged hinged plates, the end of each hinged plate is rotationally connected with a sliding seat, the two sliding seats at the same height are connected through a thrust spring, a connecting strip is commonly slidingly connected on the two sliding seats, the front and rear lower connecting strips are fixedly connected with the mounting plate, and the rear upper connecting strip is abuttingly connected with the mounting plate.

[0013] Further, the positioning assembly comprises a positioning seat, the positioning seat is dampingly slidingly connected on the horizontal section of the L-shaped frame and the horizontal frame of the fixing frame, the end faces of the two positioning seats symmetrically arranged above and below and close to each other are provided with clamping grooves, and the end faces of the two mounting plates close to each other are also symmetrically fixedly connected with positioning seats.

[0014] Further, the positioning seat on the mounting plate is provided with a limiting seat symmetrically arranged on the left and right sides, the limiting seat is provided with a chamfer and detachably connected on the positioning seat.

[0015] Further, the linkage assembly comprises a worm fixedly sleeved on the mounting rod, a worm wheel rotationally sleeved on the connecting shaft and engaged with the worm, and a transmission disc fixedly sleeved on the connecting shaft, the transmission disc is symmetrically provided with arc-shaped grooves, the arc-shaped grooves are optimal arcs, a guide rod is fixedly connected on the worm wheel and slidingly connected in the corresponding arc-shaped groove.

[0016] Further, the supporting assembly comprises threaded rods, symmetrically fixedly connected with the mounting rods, two mobile bases movably connected with the threaded rods, the lower end of the mobile base being connected with a supporting rod through a spring seat, the spring seat penetrating the workbench and movably installed on the workbench.

[0017] Further, the two mounting plates are jointly connected with an expansion seat near the front side, the movable section of the expansion seat being fixedly connected with a limiting plate, the lower mounting plate being fixedly connected with a locking seat at the rear end, and the upper mounting plate and the locking seat being detachably connected through bolts.

[0018] Compared with the prior art, the technical scheme provided by the present application has the following beneficial effects:

[0019] In the embodiment, two machining devices are symmetrically arranged on both sides of the workbench, and when machining the inclined oil holes on the crankshaft of the same specification, the positions and angles of the machining devices are only needed to be adjusted according to the angle of the inclined oil hole at the beginning, and after the clamping mechanism fixes the crankshaft, the two machining devices are synchronously fed to complete the machining of the inclined oil hole on one side, and after the machining is completed, the crankshaft is turned over by one hundred and eighty degrees through the turnover mechanism, and since the inclined oil holes of the crankshaft are symmetrically distributed with respect to the middle connecting rod journal, the machining device is automatically positioned with respect to the machining device on the other side after the turnover, and the angle of the machining device does not need to be adjusted again, and the machining device is fed again to complete the machining on the other side. The above machining utilizes the symmetric distribution characteristics of the inclined oil holes of the crankshaft, and through the cooperation of the double power heads and the turnover mechanism, the “one-time clamping and twice symmetric machining” is realized. Compared with the traditional process of multiple adjustment of the spindle, the crankshaft does not need to be clamped or the machining device does not need to be adjusted multiple times, and the machining precision is also relatively high. Compared with the high-cost cutter of the numerical control machining center, the operation is relatively simple and the cost is relatively low. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the crankshaft as the object of action in the embodiment of the present application.

[0022] Figure 2 It is a schematic diagram of the three-dimensional structure of the crankshaft when being machined by the machining device in the embodiment of the present application.

[0023] Figure 3 It is a schematic diagram of the overall structure of the embodiment of the present application.

[0024] Figure 4It is the structural schematic diagram of the clamping mechanism before and after state transformation in the embodiment of the present application.

[0025] Figure 5 It is the structural schematic diagram of the clamping mechanism in the exploded state in the embodiment of the present application.

[0026] Figure 6 It is the structural schematic diagram of the supporting assembly in the embodiment of the present application.

[0027] Figure 7 It is the structural schematic diagram of the positioning assembly in the embodiment of the present application.

[0028] Figure 8 It is the structural schematic diagram of the turnover mechanism in the embodiment of the present application.

[0029] Figure 9 It is the structural schematic diagram of the connecting shaft, transmission disc, worm gear and worm in the exploded state in the embodiment of the present application.

[0030] The reference numerals in the drawings represent respectively: 1, workbench; 11, machining device; 2, clamping mechanism; 21, connecting shaft; 22, centering assembly; 221, mounting plate; 222, scissor plate; 223, fixing frame; 224, connecting plate; 225, sliding seat; 226, connecting strip; 23, positioning assembly; 231, positioning seat; 2311, clamping groove; 232, limiting seat; 3, turnover mechanism; 31, mounting rod; 32, connecting assembly; 321, worm; 322, worm gear; 323, transmission disc; 3231, arc-shaped groove; 324, guide rod; 325, telescopic seat; 326, limiting plate; 327, locking seat; 328, bolt; 33, supporting assembly; 331, threaded rod; 332, moving seat; 333, spring seat; 334, supporting rod. DETAILED DESCRIPTION

[0031] To make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0032] The present application will be further described below in combination with the embodiments. EMBODIMENT

[0033] Please refer to Figure 3 and Figure 4 The present application provides a technical scheme: a double-power head type high-speed inner circle turning machine tool for crankshaft, comprising:

[0034] A workbench 1, two machining devices 11 for machining inclined oil holes are symmetrically arranged on the workbench 1.

[0035] A clamping mechanism 2, two mounting seats are symmetrically fixedly connected on the workbench 1, two connecting shafts 21 are rotatably connected on the mounting seats, a centering assembly 22 is commonly connected between the two connecting shafts 21, a positioning assembly 23 for positioning and clamping the crankshaft is connected on the centering assembly 22.

[0036] A turnover mechanism 3, a mounting rod 31 is rotatably connected on the workbench 1 through a connecting seat, a forward-reverse motor is fixedly connected on one end of the mounting rod 31, a linkage assembly 32 for driving the connecting shaft 21 to rotate is connected at the middle position of the mounting rod 31, supporting assemblies 33 for keeping the positioning assembly 23 horizontal are symmetrically connected on both ends of the mounting rod 31.

[0037] Specifically, before machining, the positions and angles of the two machining devices 11 are adjusted according to the machining needs of the inclined oil holes, and the two machining devices 11 are adjusted to the state as shown in the figure. Figure 2 At the beginning, the centering assembly 22 is in an open state, the supporting assemblies 33 are pushed from below to above to keep them in a horizontal state, the crankshaft to be machined is placed on the positioning assembly 23, the centering assembly 22 is closed, the crankshaft is fixed and clamped by the positioning assembly 23, then the machining devices 11 are started to make the two machining devices 11 feed synchronously to the crankshaft, and a group of inclined oil holes are machined on the crankshaft.

[0038] After machining, the two forward-reverse motor driving shafts rotate synchronously clockwise, driving the two mounting rods 31 to rotate synchronously clockwise, the rotation of the mounting rods 31 will first drive the two supporting assemblies 33 thereon to move synchronously away, releasing the support of the lower part of the centering assembly 22, then the linkage assembly 32 drives the connecting shaft 21 to rotate, when the front and rear connecting shafts 21 rotate synchronously, they will drive the centering assembly 22, the positioning assembly 23 and the crankshaft to rotate synchronously by one hundred and eighty degrees with the center axis of the connecting shaft 21 as the rotation center, so that the three are turned over synchronously, after the turning over is completed, the forward-reverse motor driving shafts rotate synchronously counterclockwise, so that the supporting assemblies 33 move again to the lower part of the centering assembly 22 to support it from below, so as to ensure the stability during machining.

[0039] It is worth noting that the inclined oil holes on the crankshaft are generally arranged between the main journal and the connecting rod journal, at a certain angle to the axis, generally inclined from the main journal oil passage to the connecting rod journal oil passage, and symmetrically distributed with the middle connecting rod journal as the center of symmetry (the distribution position of the inclined oil holes is shown in the figure). Figure 2 Based on the above characteristics, after the crankshaft is turned over by one hundred and eighty degrees, it will be switched to be aligned with the machining device 11, and another group of inclined oil holes can be machined on the crankshaft as the machining device 11 feeds again.

[0040] Compared with the conventional turning processing mode, the processing mode has the advantages that when the same specification crankshaft is processed, the position and angle of the processing device 11 only need to be adjusted before processing, the spindle angle does not need to be adjusted for multiple times or the crankshaft does not need to be re-clamped, compared with the numerical control processing center crankshaft, the processing mode has the advantages that the operation and maintenance difficulty is low, the requirement for the operator is low, and the cost is also low.

[0041] Please refer to Figure 5 and Figure 6 , the centering assembly 22 comprises mounting plates 221, two of which are symmetrically arranged on the upper and lower surfaces, the two mounting plates 221 are connected with the connecting shaft 21 through two groups of scissors plates 222 which are symmetrically arranged in front and back, and the scissors plates 222 are rotationally connected with the connecting shaft 21.

[0042] The upper mounting plate 221 is designed in two sections and rotationally connected between the two sections, two fixing frames 223 are symmetrically arranged on the left and right sides of the mounting plate 221, the fixing frame 223 is also designed in two sections and consists of an L-shaped frame and a horizontal frame which is slidingly connected to the vertical section of the L-shaped frame, the L-shaped frame and the lower mounting plate 221 are slidingly connected through the front and back symmetrically arranged connecting plates 224, and the horizontal frame and the upper mounting plate 221 are also slidingly connected through the front and back symmetrically arranged connecting plates 224.

[0043] The scissors plate 222 is composed of two symmetrically arranged hinged plates, the end of each hinged plate is rotationally connected with a sliding seat 225, the two sliding seats 225 at the same height are connected through a thrust spring, the thrust spring applies a thrust force to the two sliding seats 225, so that the two sliding seats 225 are away from each other in the initial state, a connecting strip 226 is slidingly connected to the two sliding seats 225, the connecting strips 226 in front and at the lower rear are fixedly connected with the mounting plate 221, and the connecting strip 226 at the upper rear is abuttingly connected with the mounting plate 221, since the two sliding seats 225 are away from each other, the upward included angle between the two hinged plates in the scissors plate 222 is relatively large, so that the distance between the two mounting plates 221 is also relatively small in the initial state.

[0044] Please refer to Figures 5-7 , the positioning assembly 23 comprises positioning seats 231, the positioning seats 231 are dampingly slidingly connected to the horizontal section of the L-shaped frame and the horizontal frame in the fixing frame 223, the end faces of the two positioning seats 231 which are symmetrically arranged and close to each other are provided with clamping grooves 2311, and the positioning seats 231 are also symmetrically and fixedly connected to the end faces of the two mounting plates 221 which are close to each other.

[0045] Limiting seats 232 are symmetrically arranged on the positioning seats 231 on the mounting plate 221, and the limiting seats 232 are provided with chamfers and detachably connected to the positioning seats 231.

[0046] Specifically, before machining, the positions of the positioning seats 231 on the fixing frames 223 are adjusted according to the distance between the central axis of the main journal of the crankshaft and the central axis of the connecting rod journal, so that the positions of the positioning seats 231 are approximately corresponding to the connecting rod journals, and then the crankshaft is placed horizontally on the lower positioning seats 231, and the middle connecting rod journal is placed on the positioning seat 231 of the mounting plate 221, and the remaining connecting rod journals are placed on the positioning seats 231 of the fixing frames 223, and the limiting seats 232 play a guiding role in the placement process and adjust the position of the middle connecting rod journal on the corresponding positioning seat 231 by cooperating with the crank arms on both sides of the middle connecting rod journal.

[0047] Then, the upper mounting plate 221 is rotated from the inclined state to the horizontal state (as shown in FIG. 6), and the positioning seats 231 on the upper mounting plate 221 and the positioning seats 231 on the upper fixing frames 223 press the crankshaft, and the distance between the upper mounting plate 221 and the lower mounting plate 221 is automatically adjusted according to the diameter of the connecting rod journal of the crankshaft, the included angle between the two hinged plates in the scissors plate 222 is reduced, the distance between the two sliding seats 225 is also reduced, the thrust spring is compressed, and the scissors plate 222 applies pressure to the upper mounting plate 221 in the opposite direction, so that the upper mounting plate 221 can fixedly clamp the crankshaft and prevent the crankshaft from shifting during machining. Figure 4

[0048] It is worth noting that the fixing frames 223 can slide on the connecting plates 224 within a certain range, the positioning seats 231 on the fixing frames 223 can slide on the fixing frames 223 within a certain range, and the distance between the connecting rod mounting plates 221 can change within a certain range, so as to adapt to crankshafts with different lengths of crank arms and different lengths of connecting rod journals, and increase the versatility of the machine tool.

[0049] Please refer to Figure 8 and Figure 9 , the linkage assembly 32 comprises a worm 321 fixedly sleeved on the mounting rod 31, a worm wheel 322 engaged with the worm 321 rotatably sleeved on the connecting shaft 21, and a transmission disc 323 fixedly sleeved on the connecting shaft 21, the transmission disc 323 is provided with an arc-shaped groove 3231 penetratingly formed thereon, the arc-shaped groove 3231 is an arc of a circle, a guide rod 324 is fixedly connected to the worm wheel 322, and the guide rod 324 is slidably connected in the corresponding arc-shaped groove 3231.

[0050] ​The supporting assembly 33 comprises threaded rods 331, the threaded rods 331 are symmetrically and fixedly connected to the mounting rods 31, two moving seats 332 matched with the threaded rods 331 are slidably connected to the threaded rods 331, the lower ends of the moving seats 332 are connected with supporting rods 334 through spring seats 333, the horizontal sections of the supporting rods 334 are provided with chamfers, which facilitates the sliding of the supporting rods 334 below the lower connecting plate 224, the spring seats 333 penetrate through the workbench 1 and are slidably installed on the workbench 1, in the initial state, the horizontal sections of the supporting rods 334 are below the lower connecting plate 224, on the one hand, the multiple supporting rods 334 support the connecting plate 224 from below to above, which can make the connecting plate 224 in a horizontal state, on the other hand, the upward pushing force of the supporting rods 334 under the action of the spring seats 333 can also push the upward included angle between the two hinged plates in the scissor plate 222 to increase, so as to transmit the force to the upper mounting plate 221, make the two mounting plates 221 further close to each other, improve the clamping force of the positioning seat 231 to the crankshaft, and make the clamping more stable.

[0051] Please refer to Figure 4 and Figure 6 , the positions close to the front side between the two mounting plates 221 are commonly connected with an expansion seat 325, the movable section of the expansion seat 325 is fixedly connected with a limiting plate 326 for correcting the levelness of the upper mounting plate 221, the position close to the rear end of the lower mounting plate 221 is fixedly connected with a locking seat 327, and the upper mounting plate 221 and the locking seat 327 are detachably connected through a bolt 328.

[0052] In specific work, after the upper positioning seat 231, the horizontal section of the mounting plate 221 and the fixed frame 223 are converted from the inclined state to the horizontal state and fixedly clamp the crankshaft, the bolt 328 is installed in the locking seat 327, and the upper and lower mounting plates 221 are locked.

[0053] After locking, the two forward and reverse motors are synchronously started to drive the mounting rods 31 on both sides to rotate clockwise, when the mounting rods 31 rotate, on the one hand, the threaded rods 331 are driven to rotate, so that the two moving seats 332 symmetrically move away, the supporting rods 334 are driven to move out from below the connecting plate 224 through the spring seats 333, the supporting effect of the connecting plate 224 is cancelled, and the rotation of the crankshaft is avoided, on the other hand, the rotation of the mounting rods 31 also drives the worm 321 to rotate, so as to drive the worm wheel 322 to synchronously rotate, the clockwise rotation of the worm wheel 322 drives the guide rod 324 to slide in the arc-shaped groove 3231, during this period, the transmission disc 323 is stationary, and thus the connecting shaft 21 is also stationary, until the supporting rods 334 completely separate from below the connecting plate 224, the guide rod 324 slides to the end of the arc-shaped groove 3231 and contacts with the transmission disc 323, and the transmission disc 323 is synchronously driven to rotate.

[0054] The rotation of the transmission disc 323 drives the continuous shaft 21 to rotate synchronously, and further drives the mounting plate 221, the fixed frame 223 and the crankshaft to rotate synchronously. When the continuous shaft 21 rotates by 180 degrees, the reversible motor stops first, and then starts to rotate counterclockwise, driving the mounting rod 31 to rotate counterclockwise synchronously. The counterclockwise rotation of the mounting rod 31 drives the spring seat 333 to rotate counterclockwise synchronously, so that the guide rod 324 slides to the lower side of the connecting plate 224 to support it. In this process, the guide rod 324 slides in the arc-shaped groove 3231 again and does not drive the transmission disc 323 to rotate. At this time, the crankshaft after the overturning is aligned with the machining device 11 at the position of the oil hole to be machined, so that the machining device 11 can machine another group of oil holes on the crankshaft. Compared with the conventional secondary or multiple re-clamping of the main shaft, this overturning positioning method has the advantages of high positioning accuracy and reduced machining process, which can significantly improve the machining efficiency.

[0055] It is worth noting that the reason why the arc-shaped groove 3231 must be an arc is that when the reversible motor is started for the first time, the supporting rod 334 is separated from the lower side of the connecting plate 224, and as the reversible motor continues to operate, the crankshaft is overturned and the supporting rod 334 is also driven to move away from the crankshaft. When the reversible motor is restarted after being stopped, the supporting rod 334 is driven to move towards the crankshaft again. Only when the arc-shaped groove 3231 is an arc, the guide rod 324 will not drive the transmission disc 323 to rotate when the supporting rod 334 moves to the lower side of the connecting plate 224.

[0056] Therefore, after the machining of a crankshaft is completed, the reversible motor needs to be rotated again to reset the supporting rod 334 and the clamping mechanism 2 to the initial position before machining the next crankshaft, so as to ensure the normal operation of the next machining.

[0057] It is worth noting that the above-mentioned double-power head type crankshaft high-speed internal circular turning machine tool also has the following advantages:

[0058] Advantage one, the positioning seat 231 on the fixed frame 223 can be damped and slid on the L-shaped frame and the horizontal frame, the mounting plate 221 is connected with the continuous shaft 21 through the scissors plate 222, the sliding seat 225 at the end of the scissors plate 222 is opened by the thrust spring, when the crankshaft is placed, the limiting seat 232 guides the crank arm through the chamfer, and the position is adjusted, the fixed frame 223 can slide on the connecting plate 224, the positioning seat 231 can slide on the fixed frame 223, and the spacing between the mounting plate 221 is adjusted according to the specifications of the crankshaft under the action of the scissors plate 222 and the thrust spring. Through the linkage adjustment of the positioning seat 231, the fixed frame 223 and the scissors plate 222, the clamp does not need to be frequently replaced, and various specifications of crankshafts can be quickly adapted, and the pressure of the thrust spring ensures the stability of clamping, avoids machining deviation, and improves the universality and machining stability.

[0059] Second, in this embodiment, two machining devices 11 are symmetrically arranged on both sides of the workbench 1. When machining the inclined oil holes on the same specification crankshaft, only the position and angle of the machining device 11 need to be adjusted according to the angle of the inclined oil hole at the beginning. After the clamping mechanism 2 fixes the crankshaft, the two machining devices 11 are fed synchronously to complete the machining of the inclined oil hole on one side. After the machining is completed, the crankshaft is turned over by one hundred and eighty degrees through the turnover mechanism 3. Since the inclined oil holes of the crankshaft are symmetrically distributed with the middle connecting rod journal, after the turnover, the other side to be machined hole is automatically aligned with the machining device 11, and there is no need to adjust the angle of the device again. The machining device 11 can complete the machining on the other side after feeding again. The above machining utilizes the symmetric distribution characteristics of the inclined oil holes of the crankshaft, and through the cooperation of the double power head and the turnover mechanism 3, the "one clamping and twice symmetric machining" is realized. Compared with the high-cost tool of the traditional process of adjusting the spindle or the numerical control machining center many times, the machining time and the operation complexity are greatly reduced, and the efficiency and the economy are taken into account.

[0060] Third, in this embodiment, the threaded rod 331 of the supporting assembly 33 is fixed on the mounting rod 31, the moving seat 332 is slidingly connected with the threaded rod 331, the lower end is connected with the supporting rod 334 through the spring seat 333, and the fixed section of the spring seat 333 slides on the workbench 1. In the initial state, the horizontal section of the supporting rod 334 is located below the lower connecting plate 224, the spring seat 333 applies a pushing force upward, the connecting plate 224 is supported through the supporting rod 334, the mounting plate 221 is kept horizontal, at the same time, the pushing force is transmitted to the upper mounting plate 221 through the scissor plate 222, and the crankshaft is clamped through the clamping groove 2311 of the positioning seat 231. During machining, the supporting force of the supporting rod 334 and the pressure of the pushing spring jointly act to offset the vibration caused by the cutting force, prevent the crankshaft from deviating, the mechanical linkage of the spring seat 333 and the supporting rod 334 provides a continuous upward supporting force, and the pressure transmission of the scissor plate 222 forms a double stable structure of supporting and clamping, improves the clamping rigidity of the crankshaft, reduces the machining vibration, and guarantees the machining precision and surface quality of the inclined oil hole.

[0061] Advantage four, in the embodiment, the arc-shaped slot 3231 of the transmission disc 323 is an optimal arc, the guide rod 324 of the worm wheel 322 slides in the arc-shaped slot 3231, when the mounting rod 31 rotates, the guide rod 324 is initially located in the non-driving area of the arc-shaped slot 3231, the supporting rod 334 moves away from the connecting plate 224 first, thereby releasing the support on the clamping mechanism 2, after the supporting rod 334 is completely separated, the guide rod 324 slides to the driving end of the arc-shaped slot 3231, pushes the transmission disc 323 to rotate, drives the crankshaft to overturn, when overturning, the guide rod 324 returns along the optimal arc, avoids pushing the transmission disc 323 in the reverse direction, ensures that the supporting rod 334 does not drive the crankshaft to rotate when returning, maintains the accurate positioning after overturning, the geometric characteristics of the optimal arc-shaped slot 3231 realize the action timing control of "the supporting rod 334 is separated first and then driven to overturn", avoids mechanical interference, ensures that the posture of the crankshaft is stable during overturning, the positioning accuracy is guaranteed by the rigidity of the mechanical structure, does not need to rely on manual calibration or complex sensing feedback, and improves the reliability and machining consistency of the mechanism.

[0062] Advantage five, in the embodiment, the arrangement of the scissors plate 222 in the centering assembly 22 ensures that the distance between the upper and lower mounting plates 221 to the central axis of the connecting shaft 21 is always equal, so that when the crankshafts of different specifications are cooperated by the centering assembly 22 and the positioning assembly 23, the central axis height of the connecting rod journal is always consistent with the height of the central axis of the connecting shaft 21, and the height of the central axis of the connecting shaft 21 is consistent with the height of the central axis of the machining device 11, so that only the position and angle of the machining device 11 need to be adjusted before machining, and the machining device 11 can always face the connecting shaft journal of the crankshaft.

[0063] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit the same; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the embodiments of the present application.

Claims

1. A dual-power head type crankshaft high-speed internal circular turning machine tool, characterized by, The utility model relates to a kind of centering and clamping mechanism for machining inclined oil hole of crankshaft, including: Workbench (1), two machining devices (11) for machining inclined oil hole are symmetrically arranged on the workbench (1); Clamping mechanism (2), the clamping mechanism (2) includes mounting seat, two mounting seats are symmetrically fixedly connected on the workbench (1), damping rotation is connected with connecting shaft (21) on the mounting seat, common connection is connected with centering component (22) between two connecting shafts (21), the centering component (22) is connected with the positioning component (23) for positioning and clamping crankshaft; The overturning mechanism (3) includes mounting rod (31), the mounting rod (31) is rotatably connected on the workbench (1) by connecting seat, one end of mounting rod (31) is fixedly connected with forward and reverse motor, the middle position of mounting rod (31) is connected with the linkage component (32) that can drive connecting shaft (21) rotation, two ends of mounting rod (31) are symmetrically connected with the supporting component (33) for keeping the positioning component (23) horizontal; The linkage component (32) includes worm (321), the worm (321) is fixedly sleeved on the mounting rod (31), the worm gear (322) that is engaged with the worm (321) is rotatably sleeved on the connecting shaft (21), transmission disc (323) is also fixedly sleeved on the connecting shaft (21), the arc-shaped groove (3231) is formed in the transmission disc (323), the arc-shaped groove (3231) is superior arc, the guide rod (324) is symmetrically fixedly connected on the worm gear (322), the guide rod (324) is slidably connected in the corresponding arc-shaped groove (3231); The supporting component (33) includes threaded rod (331), the threaded rod (331) is symmetrically fixedly connected on the mounting rod (31), the mobile seat (332) that is adapted to it is slidably connected on two threaded rods (331), the lower end of the mobile seat (332) is connected with supporting rod (334) by spring seat (333), spring seat (333) penetrates workbench (1) and is slidably installed on the workbench (1).

2. A dual power head type crankshaft high speed internal cylindrical turning machine according to claim 1, characterized in that: The centering component (22) includes mounting plate (221), two mounting plates (221) are symmetrically arranged on the upper and lower, two mounting plates (221) are connected with connecting shaft (21) by two groups of scissor plates (222) that are symmetrically arranged in front and back, the scissor plate (222) is rotatably connected between the connecting shaft (21).

3. A dual power head type crankshaft high speed internal cylindrical turning machine according to claim 2, characterized in that: The upper mounting plate (221) is designed in two sections and rotatably connected between two sections, two fixed frames (223) are symmetrically arranged on both sides of mounting plate (221), the fixed frame (223) is also designed in two sections, and is composed of L-shaped frame and horizontal frame slidably connected on the vertical section of L-shaped frame, the L-shaped frame and the lower mounting plate (221) are slidably connected by front and back symmetrically connected plates (224), and the horizontal frame and the upper mounting plate (221) are slidably connected by front and back symmetrically connected plates (224).

4. The dual-power head type crankshaft high-speed internal cylindrical turning machine according to claim 2, characterized by: The scissor plate (222) is composed of two symmetrically arranged hinged plates, the end of each hinged plate is rotationally connected with a sliding seat (225), the two sliding seats (225) at the same height are connected through a thrust spring, the two sliding seats (225) are jointly and slidably connected with a connecting strip (226), the connecting strips (226) at the front and lower rear are fixedly connected with the mounting plate (221), and the connecting strip (226) at the upper rear is abuttingly connected with the mounting plate (221).

5. A dual power head type crankshaft high speed internal cylindrical turning machine according to claim 2, characterized in that: The positioning assembly (23) comprises positioning seats (231), the positioning seats (231) are slidably connected to the horizontal segment of the L-shaped frame and the horizontal frame in the fixing frame (223), the end faces of the two positioning seats (231) which are symmetrically arranged and close to each other are provided with clamping grooves (2311), and the end faces of the two mounting plates (221) which are close to each other are also symmetrically and fixedly connected with the positioning seats (231).

6. A dual power head type crankshaft high speed internal cylindrical turning machine according to claim 5, characterized in that: The positioning seats (231) on the mounting plates (221) are symmetrically provided with limiting seats (232) which are arranged on the left and right sides, the limiting seats (232) are provided with chamfers and are detachably connected to the positioning seats (231).

7. The dual-power head type crankshaft high-speed internal cylindrical turning machine according to claim 1, characterized by: The two mounting plates (221) are jointly connected with an extension seat (325) at a position close to the front side, the movable segment of the extension seat (325) is fixedly connected with a limiting plate (326), the rear end of the lower mounting plate (221) is fixedly connected with a locking seat (327), and the upper mounting plate (221) and the locking seat (327) are detachably connected through bolts (328).

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