CN111590327B

CN111590327B - High-speed stable tower type boring and milling machining center

Info

Publication number: CN111590327B
Application number: CN202010437963.3A
Authority: CN
Inventors: 陈福祥; 云祥有; 张根法
Original assignee: Shanghai Xinluo Mechanical Engineering Co ltd
Current assignee: Shanghai Xinluo Mechanical Engineering Co ltd
Priority date: 2020-05-21
Filing date: 2020-05-21
Publication date: 2022-03-11
Anticipated expiration: 2040-05-21
Also published as: CN111590327A

Abstract

The invention relates to the technical field of machining, and discloses a high-speed stable tower type boring and milling machining center which comprises a base bin seat and a controller, wherein a cavity is formed in the middle of the base bin seat, a liftable central cylinder is arranged in the cavity, a bearing seat is fixed at the top of the central cylinder, a rotary table is rotatably connected onto the bearing seat, a left cutting arm and a right cutting arm are symmetrically arranged on two sides of the rotary table, a rotating mechanism capable of driving the rotary table to rotate is arranged on the bearing seat, the area of the end part of one end, connected with the rotary table, of each of the left cutting arm and the right cutting arm is 2-3 times that of the other end, and the side walls of the left cutting arm and the right cutting arm are variable sections. This scheme utilization variable cross section makes the one end weight that left cutting arm and right cutting arm are connected with the revolving stage be greater than the weight of the other end, when guaranteeing left cutting arm and right cutting arm rigidity, is close to the revolving stage center with the focus of left cutting arm and right cutting arm to reduce the moment that slewing mechanism received, reduce slewing mechanism's inside wearing and tearing, restrain resonance source frequency, avoid influencing machining precision.

Description

High-speed stable tower type boring and milling machining center

Technical Field

The invention relates to the technical field of machining, in particular to a high-speed stable tower type boring and milling machining center.

Background

With the continuous development of industrialization, the requirement on the machining production efficiency of workpieces is higher and higher, which puts forward higher new requirements on machining equipment, and not only the machining equipment is required to have high machining precision, but also the machining equipment is required to be capable of finishing the machining of multi-station steps as soon as possible. Numerical control technology and numerical control equipment are important foundations of manufacturing industry modernization, and a numerical control machine is a typical numerical control device which utilizes the numerical control technology to improve processing precision and efficiency, and the occurrence of the numerical control machine has revolutionary influence on the traditional manufacturing industry.

The machining center is a highly automated multifunctional numerical control machine tool with a tool magazine and an automatic tool changer, and a common machining center has multiple functions of turning, milling, boring and the like, but the machining center is mainly used for machining small and medium-sized parts, is rarely used for machining large-sized parts and extra-large-sized parts, and is particularly used for machining inner walls of cylindrical and box-shaped parts. The center of the common vertical machining center is a rotating shaft, and a cutter seat is arranged at the top of the rotating shaft. The machining center required for machining large and extra-large parts is large in size and weight, and when the cutter is machined, the distance between the cutter and the rotating shaft is long, so that the center of gravity deviates far from the rotating shaft, the rotating shaft is large in moment, easy to wear and easy to cause an unstable phenomenon in the rotating process, and machining precision is affected. Therefore, a high-speed stable tower-type boring and milling machining center is needed, which can avoid abrasion caused by self weight of equipment, suppress resonance source frequency and avoid influence on machining precision.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a high-speed stable tower type boring and milling machining center which can avoid abrasion caused by self weight of equipment and inhibit resonance source frequency so as to avoid influence on machining precision.

The above object of the present invention is achieved by the following technical solutions:

the utility model provides a tower boring and milling machining center of high-speed stable form, includes base storehouse seat and installs the controller on base storehouse seat, the cavity has been seted up at base storehouse seat middle part, is equipped with the central section of thick bamboo of liftable in the cavity, a center section of thick bamboo top is fixed with the bearing frame, it is connected with the revolving stage to rotate on the bearing frame, revolving stage bilateral symmetry is provided with the left cutting arm that is used for bearing the boring cutter and the right cutting arm that is used for bearing the milling cutter, be equipped with on the bearing frame and be used for driving revolving stage pivoted slewing mechanism, the one end tip area that left side cutting arm and right cutting arm and revolving stage are connected is 2-3 times of another end area, left side cutting arm and right cutting arm lateral wall are the variable cross-section.

Through adopting above-mentioned technical scheme, utilize the variable cross section to make the one end weight that left cutting arm and right cutting arm are connected with the revolving stage be greater than the weight of the other end to this when guaranteeing left cutting arm and right cutting arm rigidity, is close to the revolving stage center with the focus of left cutting arm and right cutting arm, thereby reduces the moment that slewing mechanism received, reduces slewing mechanism's internal wear, suppresses resonance source frequency, avoids influencing machining precision.

The present invention in a preferred example may be further configured to: the left cutting arm and the right cutting arm are hollow, a plurality of special-shaped boxes are fixed in the left cutting arm and the right cutting arm, and a plurality of lightening holes are formed in the special-shaped boxes.

By adopting the technical scheme, the left cutting arm and the right cutting arm are supported by the special-shaped box with hollow inner parts, so that the rigidity of the left cutting arm and the right cutting arm is ensured, the weight of the left cutting arm and the right cutting arm is reduced, the dead weight of the left cutting arm and the right cutting arm is further reduced by the arrangement of the lightening holes, and the pressure applied to the rotating mechanism is further reduced.

The present invention in a preferred example may be further configured to: the rotating mechanism comprises a rotating motor which is fixed on the edge of the lower surface of the bearing seat and electrically connected with the controller, an output shaft of the rotating motor extends upwards and penetrates through the bearing seat to be connected with the rotating motor in a rotating mode, a driving gear is fixed to the top of the output shaft of the rotating motor, and a driven gear ring meshed with the driving gear is fixed to the lower surface of the rotary table.

Through adopting above-mentioned technical scheme, utilize to rotate motor drive driving gear and rotate to this drives driven ring gear and revolving stage and rotates, has realized the function of adjusting left cutting arm and right cutting arm, and the transmission of gear train, high-speed stable, precision is good, has reduced the influence of transmission structure to the work of cutter on left cutting arm and the right cutting arm, is favorable to ensureing the machining precision.

The present invention in a preferred example may be further configured to: the bearing comprises a turntable, a bearing seat and a bearing seat, and is characterized in that a composite bearing assembly is arranged between the turntable and the bearing seat, the composite bearing assembly comprises a bearing outer ring fixed with the bearing seat and a bearing inner ring fixed with the turntable, an annular groove is formed in the bearing inner ring, the bearing outer ring is sleeved in the annular groove, and a plurality of rolling shafts are uniformly paved between the surface of the bearing outer ring and the annular groove.

Due to the fact that the equipment is large in specification and heavy in self-weight, the technical scheme is adopted, and the bearing inner ring and the bearing outer ring are combined to form the composite bearing assembly, so that the composite bearing assembly is suitable for the weight of the rotary table, and the condition that the rotation of the rotary table is influenced due to the damage of the bearing is avoided; and the friction force between the bearing inner ring and the bearing outer ring is reduced through the rolling shaft, and the energy consumption of the rotating motor is reduced.

The present invention in a preferred example may be further configured to: the improved lifting mechanism is characterized in that a lifting mechanism is arranged in the center barrel and comprises a lifting motor which is located in the center barrel and electrically connected with the controller, a lifting screw which is located in the middle of the center barrel is connected to the lifting motor in a transmission mode, the bottom of the lifting screw is connected with the base bin base in a rotating mode, the lifting barrel is matched with the base bin base in a threaded mode, the top of the lifting barrel extends to the outside of the center barrel and is fixed with a guide barrel, a guide hole clamped with the guide barrel is formed in the center of the rotary table, and a conical surface is arranged on the edge of the top of the guide barrel.

Through adopting above-mentioned technical scheme, utilize elevator motor drive lift lead screw to rotate to this drives a lift section of thick bamboo and reciprocates on lift lead screw, and then drives guide cylinder and revolving stage lift, has realized the regulation to left cutting arm and right cutting arm height, is convenient for carry out the boring and milling.

The present invention in a preferred example may be further configured to: the top of the lifting cylinder is fixed with a disc-shaped connecting disc, the edge of the upper surface of the connecting disc is fixed with the bottom of the guide cylinder, and the middle part of the upper surface of the connecting disc is also fixed with a cylindrical weight.

Through adopting above-mentioned technical scheme, utilize cylindricality pouring weight to be close to the revolving stage center with the focus on the whole revolving stage to further reduce the moment that slewing mechanism received.

The present invention in a preferred example may be further configured to: and a bearing hydraulic cylinder is fixed on the base bin seat, and a round hole for a piston rod of the bearing hydraulic cylinder to insert and tightly abut against is formed in the inner top surface of the central cylinder.

Through adopting above-mentioned technical scheme, utilize the weight of the balanced revolving stage of bearing pneumatic cylinder and center section of thick bamboo, the setting of round hole still plays the effect of avoiding producing askew between center section of thick bamboo and the bearing pneumatic cylinder, has promoted the stability of a center section of thick bamboo, and the operating personnel of being convenient for installs bearing frame and revolving stage on a center section of thick bamboo.

The present invention in a preferred example may be further configured to: and a plurality of lightening holes are formed in the rotary table, the central cylinder and the base bin seat.

By adopting the technical scheme, the weight of the machining center is reduced by the lightening holes on the rotary table, the center cylinder and the base bin seat, so that the energy consumption of the bearing hydraulic cylinder is reduced.

The present invention in a preferred example may be further configured to: the utility model discloses a bearing platform, including base storehouse seat, bearing platform and base storehouse seat, the bearing platform all sides have been placed and have been traded the sword platform, trade the sword platform and include the support frame and be located the bearing platform of support frame top, be equipped with the fixed plate of liftable on the support frame, the bearing platform slides with the fixed plate and is connected.

By adopting the technical scheme, the lifting and sliding bearing platform is arranged, so that the activity space of an operator is enlarged, the flexibility is improved, the operator can conveniently perform tool changing operation, and the tool changing efficiency is improved.

The present invention in a preferred example may be further configured to: the lower side of the bearing table is provided with a sliding assembly, the sliding assembly comprises the fixed plate, the fixed plate is provided with a sliding plate in a sliding manner, the upper surface of the sliding plate is fixedly provided with a plurality of upper fixed blocks, each upper fixed block is provided with an upper sliding chute, the lower surface of the bearing table is fixedly provided with an upper sliding rail in sliding fit with the upper sliding chute, the upper surface of the fixed plate is fixedly provided with a plurality of lower fixed blocks, each lower fixed block is provided with a lower sliding chute, the lower surface of the sliding plate is fixedly provided with a lower sliding rail in sliding fit with the lower sliding chute, the upper surfaces of the sliding plate and the fixed plate are respectively provided with an upper mounting groove and a lower mounting groove for mounting the upper fixed blocks and the lower fixed blocks, the lengths of the upper mounting groove and the lower mounting groove are equal to the lengths of the edges of the sliding plate and the fixed plate, each upper sliding rail is matched with two upper sliding chutes, one of the upper sliding chutes is positioned in the middle of the upper mounting groove, the other upper sliding groove is positioned at the end part of the upper mounting groove; each lower sliding rail is matched with two lower sliding grooves, one lower sliding groove is positioned in the middle of the lower mounting groove, and the other lower sliding groove is positioned at the end part of the lower mounting groove; each go up the slide rail and all seted up threaded hole on the lateral wall at slide rail both ends down, screw-thread fit has stop screw on the threaded hole, and the last cladding of stop screw has the rubber sleeve.

By adopting the technical scheme, the sliding distance between the bearing platform and the sliding plate is limited by the limiting screw, and the sliding distance is limited to half of the length of the upper mounting groove and the length of the lower mounting groove, so that the upper fixing block and the lower fixing block are prevented from being separated from the sliding plate and the fixing plate due to overlarge stress, the firmness of the bearing platform is enhanced, and the safety of operators is guaranteed; the limiting screw is detachable, so that an operator can replace the limiting screw at regular intervals, and the limiting effect is ensured; the rubber sleeve can weaken the impact and play a role in protecting the upper fixing block and the lower fixing block.

In summary, the invention includes at least one of the following beneficial technical effects:

1. this scheme utilization variable cross section makes the one end weight that left cutting arm and right cutting arm are connected with the revolving stage be greater than the weight of the other end, when guaranteeing left cutting arm and right cutting arm rigidity, is close to the revolving stage center with the focus of left cutting arm and right cutting arm to reduce the moment that slewing mechanism received, reduce slewing mechanism's inside wearing and tearing, avoid influencing the machining precision. (ii) a

2. According to the scheme, the left cutting arm and the right cutting arm are supported by the special-shaped box with a hollow inner part, so that the rigidity of the left cutting arm and the right cutting arm is ensured, the weight of the left cutting arm and the right cutting arm is reduced, the dead weight of the left cutting arm and the right cutting arm is further reduced by the arrangement of the lightening holes, and the pressure applied to the rotating mechanism is further reduced;

3. this scheme utilization cylindricality pouring weight is close to the focus on the whole revolving stage to the revolving stage center to further reduce the moment that slewing mechanism received.

Drawings

FIG. 1 is a top view of a structure of the present invention;

FIG. 2 is a schematic sectional view of the base of the present invention;

FIG. 3 is an exploded view of the structure on the cutting arm of the present invention;

FIG. 4 is an exploded view of the structure within the receiving chamber of the present invention;

FIG. 5 is an exploded view of the upper and lower structures of the turntable according to the present invention;

FIG. 6 is a schematic structural view of a tool changer of the present invention;

fig. 7 is an enlarged schematic view of the structure at a in fig. 6.

Reference numerals: 1. a base bin seat; 11. a central barrel; 12. a bearing seat; 13. changing a tool table; 131. a support frame; 1311. a cross-shaped fixing frame; 1312. a sleeve; 132. a bearing table; 1321. a fence; 1322. a step; 133. a sliding assembly; 1331. a fixing plate; 1332. a lower fixed block; 1333. a lower chute; 1334. a lower mounting groove; 1341. a sliding plate; 1342. a lower slide rail; 1343. an upper fixed block; 1344. an upper chute; 1345. mounting a mounting groove; 135. an upper slide rail; 136. a limiting bump; 137. a lifting assembly; 1371. a lifting hydraulic cylinder; 1372. a guide post; 2. a turntable; 21. a guide hole; 22. a fabrication hole; 23. a top cover; 3. a left cutting arm; 31. a lower base; 32. an upper base; 321. a receiving cavity; 322. a movable frame; 323. a roller; 324. a disc spring; 325. a guide ring; 33. an X-direction driving mechanism; 331. a first drive motor; 332. a screw rod in the X direction; 333. a first moving block; 34. a Y-direction driving mechanism; 341. a second drive motor; 342. a Y-direction lead screw; 343. a second moving block; 35. a tool holder; 4. a right cutting arm; 51. rotating the motor; 52. a driving gear; 53. a driven gear ring; 54. a composite bearing assembly; 541. a bearing outer race; 542. a roller; 543. a bearing inner race; 544. an annular groove; 61. a lifting motor; 62. lifting a screw rod; 63. a transmission case; 64. a lifting cylinder; 65. a connecting disc; 66. a guide cylinder; 67. a columnar weight; 68. a load-bearing hydraulic cylinder; 69. a vertical slide rail; 691. a vertical slide block; 7. a special-shaped box.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, the high-speed stable tower type boring and milling machining center disclosed by the invention comprises a base 1, a turntable 2 and a controller (not shown); referring to fig. 2, the base 1 is tower-shaped, a hollow cavity is reserved in the hollow cavity, a central cylinder 11 is arranged in the hollow cavity, the cross section of the central cylinder 11 is regular octagon, the central cylinder is hollow in the hollow cavity, and a circular opening is formed in the top of the central cylinder. The top of the central cylinder 11 is provided with a bearing seat 12, the bearing seat 12 is in a circular disc structure, and the rotary table 2 is rotatably installed on the bearing seat 12. The cross section of the rotary table 2 is annular, two symmetrical cross sections are arranged on the periphery of the rotary table, a left cutting arm 3 and a right cutting arm 4 are respectively fixed on the two cross sections, and cutters for processing are respectively arranged on the left cutting arm 3 and the right cutting arm 4; the controller is used as a central processing unit of the machining center and is used for identifying operation commands written by operators and controlling the cutter to machine the workpiece.

As shown in fig. 1 and 3, the left cutting arm 3 and the right cutting arm 4 are hollow inside and have a box-type structure, the area of one end part of the left cutting arm 3 and the right cutting arm 4 connected with the turntable 2 is 2-3 times of the area of the other end part, and the side walls of the left cutting arm 3 and the right cutting arm 4 are of variable cross sections. A plurality of special-shaped boxes 7 used for supporting are fixed in the left cutting arm 3 and the right cutting arm 4, and a plurality of lightening holes are formed in the special-shaped boxes 7.

The left cutting arm 3 is provided with a lower base 31 and an upper base 32, the bottom of the upper base 32 is fixed with the lower base 31, and the upper base 32 is provided with a cutter seat 35 provided with cutters. Be equipped with down base 31 and last base 32 on the left side cutting arm 3, go up base 32 lower surface edge and the lower base 31 upper surface edge and all seted up a plurality of screw holes, a plurality of screw holes are followed the 31 length direction align to grid distribution of lower base, and screw-thread fit has a plurality of bolts on the screw hole to this is realized going up the fixed between base 32 and the lower base 31. And a cutter seat 35 provided with a cutter is arranged on the upper base 32. The left cutting arm 3 is provided with a sliding groove for the lower base 31 to slide and an X-direction sliding mechanism for driving the lower base 31 to slide, and the X-direction sliding mechanism comprises a first driving motor 331, an X-direction lead screw 332 and a first moving block 333. The first driving motor 331 is fixed at one end of the chute formed by the left cutting arm 3, which is close to the rotary table 2, an output shaft of the first driving motor 331 extends to the other end of the chute, an X-direction lead screw 332 is fixed on the output shaft of the first driving motor 331, and the other end of the X-direction lead screw 332 is rotatably connected with the other end of the chute. When the first driving motor 331 rotates, the X-direction lead screw 332 is driven to rotate, so as to drive the first moving block 333 to move along the X-direction lead screw 332, thereby realizing the X-direction sliding of the lower base 31 and the upper tool seat 35, and facilitating the adjustment of the X-direction position of the tool. The upper base 32 is provided with a sliding groove for sliding the tool holder 35 and a Y-direction driving mechanism 34 for driving the tool holder 35 to slide, and the Y-direction driving mechanism 34 includes a second driving motor 341, a Y-direction lead screw 342 and a second moving block 343. The second driving motor 341 is fixed at one end of the chute formed in the upper base 32, an output shaft of the second driving motor 341 extends to the other end of the chute, a Y-direction lead screw 342 is fixed on the output shaft of the second driving motor 341, and the other end of the Y-direction lead screw 342 is rotatably connected with the other end of the chute. When the second driving motor 341 rotates, the Y-direction lead screw 342 is driven to rotate, so as to drive the second moving block 343 to move along the Y-direction lead screw 342, thereby realizing Y-direction sliding of the tool holder 35, and facilitating adjustment of the Y-direction position of the tool.

As shown in fig. 3 and 4, the bottom of the upper base 32 is provided with a plurality of receiving cavities 321, in this embodiment, there are four receiving cavities 321, and the four receiving cavities 321 are distributed in a rectangular array. Each accommodating cavity 321 is internally provided with a movable frame 322, the top of the movable frame 322 is of a vertical rod-shaped structure, the bottom of the movable frame is provided with a rotating shaft in a penetrating way, and the rotating shaft is fixed with a roller 323. In this embodiment, the rollers 323 are steel bearings that are rotatably coupled to the upper surface of the upper base 32. A plurality of disc springs 324 which are stacked one on another are sleeved on the rod-shaped part at the top of the movable frame 322; the middle of the disc spring 324 is fixed to the movable frame 322, and the uppermost disc spring 324 abuts against the top of the receiving cavity 321. When the belleville spring 324 is pressed by the force exceeding the weight of the upper base 32, the belleville spring 324 contracts, and the movable rack 322 is lifted due to the contraction of the belleville spring 324, so that the roller 323 is accommodated in the accommodating cavity 321, and at the moment, an operator can fix the upper base 32 and the lower base 31 through bolts. When the position of the upper base 32 needs to be changed, after the bolts are disassembled, the belleville springs 324 are relaxed, and the rollers 323 at the bottom of the movable frame 322 extend downwards, so that the rollers 323 are in rolling connection with the upper surface of the lower base 31, an operator can conveniently push the upper base 32, tools such as a crane and the like are not needed for hoisting and transporting, and the lifting device is convenient and fast. The receiving cavity 321 is further fixed with a guiding ring 325, the guiding ring 325 is circular, and the middle portion of the guiding ring is abutted against the sidewall of the bottom of the movable rack 322, so as to prevent the movable rack 322 from shifting when ascending and descending.

As shown in fig. 2 and 5, the base cartridge 1 is provided with a rotating mechanism, and the rotating mechanism includes a rotating motor 51, a driving gear 52, a driven ring gear 53, and a compound bearing assembly 54. In this embodiment, there are two rotating motors 51, the two rotating motors 51 are both fixed on the edge of the lower surface of the bearing seat 12 and electrically connected to the controller, the output shaft of the rotating motor 51 extends upward and penetrates through the bearing seat 12, the output shaft of the rotating motor 51 is rotatably connected to the bearing seat 12, and the driving gear 52 is fixed on the output shaft of the rotating motor 51. The driven gear ring 53 is circular, teeth are arranged on the outer side wall of the driven gear ring, the driven gear ring is fixed on the lower surface of the rotary table 2 through bolts, and the driven gear ring 53 is meshed with the two driving gears 52. When the rotating motor 51 is started, the driving gear 52 is driven to rotate, so that the driven gear ring 53 and the rotary table 2 are driven to rotate, and the function of adjusting the cutting arm is realized. As shown in connection with fig. 3, the composite bearing assembly 54 includes a bearing outer race 541, a bearing inner race 543, and a roller 542. The bearing inner ring 543 and the bearing outer ring 541 are both circular rings, and an annular groove is formed around the bearing inner ring 543 for the bearing outer ring 541 to fit. The plurality of rollers 542 is provided, and the plurality of rollers 542 are uniformly laid between the surface of the bearing outer ring 541 and the annular groove 544. The bearing outer ring 541 is fixed on the upper surface of the bearing seat 12 through a hexagon bolt, the bearing inner ring 543 is fixed on the lower surface of the rotary table 2 through a hexagon bolt, and a plurality of threaded holes are distributed on the bearing inner ring 543 and the bearing outer ring 541 in a surrounding mode so that the inner hexagon bolt can penetrate through the threaded holes. A plurality of fabrication holes 22 penetrating through the turntable 2 are formed in the turntable 2 for a wrench to pass through, and the distance between the fabrication holes 22 and the central axis of the turntable 2 is equal to the distance between the threaded hole in the bearing outer ring 541 and the central axis of the bearing outer ring, so that an operator can fix the bearing outer ring 541.

Circular shape guiding hole 21 has been seted up at the revolving stage 2 middle part, and bearing frame 12 middle part opening part is equipped with guide cylinder 66, and guide cylinder 66 is the cylinder, and the lateral wall of guide cylinder 66 passes through the key-type connection chucking with guiding hole 21 inside wall. The top edge of the guide cylinder 66 is also provided with a conical surface to facilitate the installation of the guide cylinder 66 with the guide hole 21. The guide cylinder 66 is a part of a lifting mechanism, and the lifting mechanism further includes a lifting motor 61, a lifting screw 62, a transmission case 63, and a lifting cylinder 64. The lifting motor 61 is positioned in the base cabin base 1 and is electrically connected with the controller, the transmission box 63 is positioned at the lower side of the lifting motor 61, and the output shaft of the lifting motor 61 extends downwards into the transmission box 63. The bottom of the lifting screw 62 also extends into the transmission case 63, and the transmission case 63 is internally provided with a gear transmission assembly, so that the transmission connection between the lifting motor 61 and the lifting screw 62 is realized, and the purposes of speed reduction and transmission are achieved.

The lifting cylinder 64 is cylindrical, is sleeved on the top of the lifting screw 62 and is in threaded fit with the lifting screw 62; the top of the lifting cylinder 64 is provided with a circular connecting disc 65, the middle part of the connecting disc 65 is fixed with the top of the lifting cylinder 64, and the edge of the upper surface of the connecting disc 65 is fixed with the bottom of the guide cylinder 66. When the lifting motor 61 is started, the lifting screw 62 is driven to rotate, so that the lifting cylinder 64 is driven to move up and down on the lifting screw 62, and the guide cylinder 66 and the rotary table 2 are driven to lift, the height of the cutting arm is adjusted, and the boring and milling processing is facilitated. A cylindrical weight 67 is further fixed to the middle of the upper surface of the connecting plate 65, and the cylindrical weight 67 is cylindrical and made of lead and used for enabling the center of gravity of the whole turntable 2 to be close to the center of the turntable 2, so that the moment applied to the rotating mechanism is further reduced. The turntable 2 is further provided with a top cover 23, the top cover 23 is cylindrical, an annular flange is integrally formed on the outer side wall of the top cover 23, and the top of the guide cylinder 66 is provided with an annular groove for fixing the flange, so that the insulating and protecting effects are achieved.

Still be equipped with two bearing hydraulic cylinders 68 in the base storehouse seat 1, two bearing hydraulic cylinders 68 bottom and base storehouse seat 1 bottom are fixed, and the top is contradicted with the interior top surface of a center section of thick bamboo 11, has seted up two round holes on the top surface in a center section of thick bamboo 1111, and bearing hydraulic cylinder 6868111's piston rod top with insert in the round hole and support tightly to this balance revolving stage 2 and the weight of a center section of thick bamboo 11, avoid elevating system pressurized too big and damage. Lightening holes are formed in the rotary table 2, the base bin seat 1 and the central cylinder 11 so as to reduce the load of the bearing hydraulic cylinder 68. Still be equipped with two vertical slide rails 69 on the lateral wall of a center section of thick bamboo 11, vertical slide rail 69 top and bearing frame 12 lower surface are fixed, and the side slides with a 11 lateral wall of a center section of thick bamboo and is connected, and each vertical slide rail 69 slides on the cooperation and has two vertical slider 691, and vertical slider 691 passes through flange joint with base storehouse seat 1 the one side of a back of a center section of thick bamboo 11.

As shown in fig. 1 and 6, a tool changing table 13 is further disposed on the periphery of the base cartridge seat 1, the tool changing table 13 includes a support frame 131 and a bearing table 132, and the support frame 131 is located below the cutting arm; the supporting platform 132 is a plate-shaped structure, and is located above the supporting frame 131 for supporting an operator. The periphery of the carrying platform 132 is provided with a rail 1321, and the bottom of the rail 1321 is fixed with the carrying platform 132 to prevent an operator from falling. A step 1322 is further disposed on one side of the supporting frame 131, and handrails are fixed to both sides of the step 1322, so that an operator can conveniently and safely get on the platform 132.

A fixed plate 1331 and a sliding plate 1341 are further disposed between the load-bearing platform 132 and the supporting frame 131, and both the fixed plate 1331 and the sliding plate 1341 are rectangular plate-shaped structures and have the same area. The fixed plate 1331 is located below the sliding plate 1341, and a lifting assembly 137 is disposed between the supporting frame 131 and the fixed plate 1331, wherein the lifting assembly 137 includes a lifting hydraulic cylinder 1371 and four guide posts 1372. A cross fixing frame 1311 is fixed in the middle of the supporting frame 131, the cross section of the cross fixing frame 1311 is cross-shaped, the middle of the cross fixing frame 1311 is cylindrical, the hydraulic cylinder 1371 is fixed in the middle of the cross fixing frame 1311, and the piston rod of the hydraulic cylinder 1371 extends upwards to the bottom of the fixing plate 1331 and abuts against the lower surface of the fixing plate 1331. Four cylindrical sleeves 1312 are fixed on the supporting frame 131, and four guide posts 1372 are slidably engaged with the four sleeves 1312, respectively, and in this embodiment, the guide posts 1372 are telescopic posts. The tops of guide posts 1372 are fixed to the lower surface of fixing plate 1331, and when hydraulic lift cylinder 1371 is activated, the piston rod of hydraulic lift cylinder 1371 lifts fixing plate 1331 and carrier 132 thereon upward, at which time guide posts 1372 extend out of sleeve 1312; when the piston rod of the hydraulic lift cylinder 1371 is retracted, the fixed plate 1331 descends under the force of gravity, and the guide posts 1372 are received in the sleeves 1312, thereby performing the lifting function of the platform 132.

As shown in fig. 6 and 7, both sides of the upper surface of the fixing plate 1331 are provided with lower mounting grooves 1334, the length of the lower mounting groove 1334 is the same as that of the side of the fixing plate 1331, and in this embodiment, two lower fixing blocks 1332 are fixedly mounted on each lower mounting groove 1334. The lower fixing block 1332 is a rectangular block structure, and is provided with a lower chute 1333, the length direction of the lower chute 1333 is the same as that of the lower mounting groove 1334, and the two lower fixing blocks 1332 are respectively located at the middle part and the end part of the lower mounting groove 1334. Two lower sliding rails 1342 are fixed on the lower surface of the sliding plate 1341, and the lower sliding rails 1342 are slidably matched with the lower sliding grooves 1333, so as to realize the sliding of the sliding plate 1341.

Both sides of the upper surface of the sliding plate 1341 are provided with upper mounting grooves 1345, the length of the upper mounting grooves 1345 is the same as the length of the side edge of the sliding plate 1341, and in this embodiment, two upper fixing blocks 1343 are fixedly mounted on each upper mounting groove 1345. The shape of the upper fixing block 1343 is the same as that of the lower fixing block 1332, an upper chute 1344 is formed in the upper fixing block 1343, the length direction of the upper chute 1344 is identical to that of the upper mounting groove 1345, and the two upper fixing blocks 1343 are respectively located in the middle and at the end of the upper mounting groove 1345. Two upper slide rails 135 are fixed on the lower surface of the bearing platform 132, and the upper slide rails 135 are in sliding fit with the upper slide grooves 1344, so as to realize the sliding of the bearing platform 132. And the upper chute 1344 and the lower chute 1333 are all dovetail grooves, so as to prevent the bearing platform 132 from inclining and ensure the safety of operators.

Threaded holes are formed in the side walls of the two ends of the upper sliding rail 135 and the lower sliding rail 1342, limit screws are in threaded fit with the threaded holes, one ends of the limit screws exposed out of the threaded holes protrude out of the surfaces of the two sides of the upper sliding rail 135 and the lower sliding rail 1342, and rubber sleeves made of rubber are wrapped on the limit screws. When the carrier 132 slides outward the supporting frame 131, the limiting screws are abutted against the upper fixing block 1343 located in the middle of the upper mounting groove 1345 and the lower fixing block 1332 located in the middle of the lower mounting groove 1334, so as to limit the sliding distance of the carrier 132, so that the carrier 132 can only slide relative to the sliding plate 1341 by half the length of the upper mounting groove 1345, and limit the sliding plate 1341 can only slide relative to the fixing plate 1331 by half the length of the lower mounting groove 1334, so as to reduce the torque between the upper fixing block 1343, the lower fixing block 1332 and the carrier 132, and prevent the upper fixing block 1343 and the lower fixing block 1332 from being separated from the sliding plate 1341 and the fixing plate 1331 due to excessive stress, thereby enhancing the firmness of the carrier 132.

The implementation principle of the embodiment is as follows: when the workpiece needs to be machined, an operator only needs to write the machining process into a program language and input the program language into the controller, and the controller controls the rotation mechanism and the lifting mechanism to operate and controls the movement of the cutters on the left cutting arm 3 and the right cutting arm 4 so as to machine the workpiece. In this embodiment, the variable cross-section makes the weight of the end of the left cutting arm 3 and the right cutting arm 4 connected to the turntable 2 greater than the weight of the other end, so that the rigidity of the left cutting arm 3 and the right cutting arm 4 is ensured, and the center of gravity of the left cutting arm 3 and the center of gravity of the right cutting arm 4 are close to the center of the turntable 2, thereby reducing the moment applied to the rotating mechanism, reducing the internal wear of the rotating mechanism, suppressing the resonance source frequency, and avoiding the influence on the processing precision.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. A high-speed stable tower type boring and milling machining center, which comprises a base cabin seat (1) and a controller arranged on the base cabin seat (1), it is characterized in that the middle part of the base cabin seat (1) is provided with a cavity, a lifting central cylinder (11) is arranged in the cavity, a bearing seat (12) is fixed at the top of the central cylinder (11), a rotary table (2) is rotatably connected on the bearing seat (12), a left cutting arm (3) used for bearing a boring cutter and a right cutting arm (4) used for bearing a milling cutter are symmetrically arranged on two sides of the rotary table (2), a rotating mechanism for driving the rotary table (2) to rotate is arranged on the bearing seat (12), the area of the end part of one end of the left cutting arm (3) and the right cutting arm (4) connected with the turntable (2) is 2-3 times of the area of the other end, the side walls of the left cutting arm (3) and the right cutting arm (4) are variable sections; the rotating mechanism comprises a rotating motor (51) which is fixed on the edge of the lower surface of a bearing seat (12) and is electrically connected with a controller, an output shaft of the rotating motor (51) extends upwards and penetrates through the bearing seat (12) to be connected with the bearing seat in a rotating mode, a driving gear (52) is fixed to the top of the output shaft of the rotating motor (51), and a driven gear ring (53) meshed with the driving gear (52) is fixed to the lower surface of the rotary table (2).

2. The high-speed stable tower-type boring and milling machining center of claim 1, wherein the left cutting arm (3) and the right cutting arm (4) are hollow, a plurality of special-shaped boxes (7) are fixed in the left cutting arm and the right cutting arm, and a plurality of lightening holes are formed in the special-shaped boxes (7).

3. The high-speed stable tower-type boring and milling machining center is characterized in that a composite bearing assembly (54) is arranged between the rotary table (2) and the bearing seat (12), the composite bearing assembly (54) comprises a bearing outer ring (541) fixed with the bearing seat (12) and a bearing inner ring (543) fixed with the rotary table (2), an annular groove (544) is formed in the bearing inner ring (543), the bearing outer ring (541) is sleeved in the annular groove (544), and a plurality of rolling shafts (542) are uniformly paved between the surface of the bearing outer ring (541) and the annular groove (544).

4. The high-speed stable tower type boring and milling machining center is characterized in that a lifting mechanism is arranged in the center barrel (11), the lifting mechanism comprises a lifting motor (61) which is arranged in the center barrel (11) and electrically connected with a controller, a lifting lead screw (62) which is arranged in the middle of the center barrel (11) is in transmission connection with the lifting motor (61), the bottom of the lifting lead screw (62) is rotatably connected with the base (1) and is in threaded fit with the lifting barrel (64), the top of the lifting barrel (64) extends out of the center barrel (11) and is fixed with a guide barrel (66), a guide hole (21) which is tightly clamped with the guide barrel (66) is formed in the center of the rotary table (2), and a conical surface is arranged on the top edge of the guide barrel (66).

5. The high-speed stable tower type boring and milling machining center as claimed in claim 4, wherein a disc-shaped connecting disc (65) is fixed to the top of the lifting cylinder (64), the edge of the upper surface of the connecting disc (65) is fixed to the bottom of the guide cylinder (66), and a cylindrical weight (67) is further fixed to the middle of the upper surface of the connecting disc (65).

6. The high-speed stable tower-type boring and milling machining center according to claim 1, wherein a bearing hydraulic cylinder (68) is fixed on the base (1), and a circular hole for a piston rod of the bearing hydraulic cylinder (68) to be inserted and tightly abutted is formed in the inner top surface of the central cylinder (11).

7. The high-speed stable tower-type boring and milling machining center of claim 1, wherein a plurality of lightening holes are formed in the rotary table (2), the central cylinder (11) and the base (1).

8. The high-speed stable tower-type boring and milling machining center according to claim 1, wherein a cutter changing table (13) is placed on the periphery of the base (1), the cutter changing table (13) comprises a support frame (131) and a bearing table (132) located above the support frame (131), a liftable fixing plate (1331) is arranged on the support frame (131), and the bearing table (132) is connected with the fixing plate (1331) in a sliding manner.

9. The tower boring and milling machining center of claim 8, characterized in that a sliding assembly (133) is disposed under the bearing platform (132), the sliding assembly (133) includes the fixing plate (1331), a sliding plate (1341) is slidably disposed on the fixing plate (1331), a plurality of upper fixing blocks (1343) are fixed on the upper surface of the sliding plate (1341), an upper sliding slot (1344) is formed on each upper fixing block (1343), an upper sliding rail (135) slidably engaged with the upper sliding slot (1344) is fixed on the lower surface of the bearing platform (132), a plurality of lower fixing blocks (1332) are fixed on the upper surface of the fixing plate (1331), a lower sliding slot (1333) is formed on each lower fixing block (1332), and a lower sliding rail (1342) slidably engaged with the lower sliding slot (1333) is fixed on the lower surface of the sliding plate (1341), the upper surfaces of the sliding plate (1341) and the fixed plate (1331) are respectively provided with an upper mounting groove (1345) and a lower mounting groove (1334) for mounting the upper fixed block (1343) and the lower fixed block (1332), the lengths of the upper mounting groove (1345) and the lower mounting groove (1334) are equal to the lengths of the edges of the sliding plate (1341) and the fixed plate (1331), each upper slide rail (135) is matched with two upper slide grooves (1344), one of the upper slide grooves (1344) is positioned in the middle of the upper mounting groove (1345), and the other upper slide groove (1344) is positioned at the end part of the upper mounting groove (1345); each lower sliding rail (1342) is matched with two lower sliding grooves (1333), wherein one lower sliding groove (1333) is positioned in the middle of a lower mounting groove (1334), and the other lower sliding groove (1333) is positioned at the end part of the lower mounting groove (1334); each side wall at the two ends of the upper sliding rail (135) and the lower sliding rail (1342) is provided with a threaded hole, and a limit screw is in threaded fit with the threaded hole.