CN210358658U - Mechanical full-electric servo numerical control bending machine based on composite drive - Google Patents
Mechanical full-electric servo numerical control bending machine based on composite drive Download PDFInfo
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- CN210358658U CN210358658U CN201921156020.2U CN201921156020U CN210358658U CN 210358658 U CN210358658 U CN 210358658U CN 201921156020 U CN201921156020 U CN 201921156020U CN 210358658 U CN210358658 U CN 210358658U
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Abstract
The utility model discloses a mechanical type full electric servo numerical control bender based on combined drive, including the frame, link firmly the lower mould that is used for bending with the frame, can follow the main slider of frame up-and-down motion, with main slider sliding connection and the vice slider that can slide relatively from top to bottom and with vice slider link firmly, cooperate the last mould that the lower mould was bent, be connected with on the main slider and be used for driving the main slider together with the main actuating mechanism of vice slider motion, bilateral symmetry is connected with two vice actuating mechanism that are used for driving the relative main slider motion of vice slider on the vice slider. The utility model discloses be fit for the large-tonnage, and have heavy load, high accuracy, low energy consumption, driving motor power is little, power utilization is high, fast and manufacturing cost low grade advantage, utilize link mechanism's non-linear motion characteristic and the auto-lock characteristic of specific position and the vice driven auto-lock characteristic of screw thread simultaneously.
Description
Technical Field
The utility model relates to a panel bender especially relates to a full electric servo numerical control bender of mechanical type based on combined drive.
Background
The numerical control bending machine is the most important and basic equipment in the field of metal plate processing, and energy conservation, environmental protection, high speed, high precision, digitalization and intellectualization are the development trends in the future. The driving modes of the numerical control bending machine include hydraulic driving and mechanical and electrical servo driving, and at present, the hydraulic driving mode is mainly used, but the mechanical and electrical servo driving is a future development trend.
The hydraulic drive has the advantages of large tonnage and easy realization of bending processing of large-breadth thick plates; the disadvantages of hydraulic drives are the following: 1. large noise, high energy consumption, hydraulic oil leakage and environmental pollution; 2. the cost is high, and high-precision parts such as a hydraulic oil cylinder, a valve bank, a hydraulic pump and the like have high cost, wherein the high-end market of the valve bank and the hydraulic pump almost completely depends on import, and the cost is high; 3. the precision is not high, the position precision control of the hydraulic system has inherent disadvantages, and the position controllability is poor; 4. the service life is short, components are worn, and the hydraulic oil circuit is polluted, so that the stability of a hydraulic system is easily influenced; 5. the action impact of the slide block is large and not gentle; 6. the influence of factors such as environmental temperature, humidity and dust is large; 7. the motion control is complicated.
The mechanical-electric servo can solve the defects of the hydraulic driving mode, but the mechanical-electric servo driving mode has technical bottlenecks, so that the mechanical-electric servo is only applied to the field of small tonnage at present and generally does not exceed 50 tons. The existing small-tonnage mechanical all-electric servo bending driving mode is shown in fig. 1 and fig. 2, a heavy-duty ball screw driving mode is mostly adopted, and the small-tonnage mechanical all-electric servo bending driving mode mainly comprises a servo motor a, a synchronous belt transmission b, a ball screw transmission c, a sliding block d, a workbench e and the like. The servo motor is fixed on the rack, the ball screw is hinged with the rack, the sliding block is connected with the rack in a sliding mode and can slide along the upper direction and the lower direction of the rack, and the workbench is fixed on the rack. The synchronous belt transmission consists of a small belt wheel, a synchronous belt and a large belt wheel, and plays roles in speed reduction and transmission. The slide block is driven by the ball screw transmission pair, the servo motor drives the screw to rotate through the synchronous belt, and the slide block moves up and down under the driving of the ball screw transmission pair. The sliding block d moves up and down relative to the workbench e, the upper die f is installed on the sliding block, and the lower die g is installed on the workbench, so that the bending processing of the plate h can be realized. The slide block is symmetrically driven by the left screw and the right screw, so that on one hand, the load is large, the rigidity is high, and on the other hand, when a parallelism error occurs between the upper die and the lower die, the parallelism fine adjustment can be realized through the reverse rotation of the left motor and the right motor.
The mechanical full-electric servo bending machine driven by the ball screw has the advantages of simple structure, high mechanical transmission efficiency, high speed and high precision, and effectively solves the problems of hydraulic transmission; the disadvantages are as follows: 1. the cost is high, the high-precision and heavy-load ball screw basically depends on import, and the price is high; 2. the machining and manufacturing precision of the machine tool is high; 3. the bending machine is only suitable for small-tonnage bending machines; 4. the power utilization rate is low, the required driving motor power is large, and the cost is high; 5. the lead screw is easily worn and damaged.
The power utilization rate and the power consumed by the servo motor in the actual use process are determined by the load, and the ratio of the power consumed in the actual use process to the maximum power index (or rated power) which can be reached by the motor can be used as the power utilization rate. Generally, the bending machine successively undergoes three action stages in the process of bending the plate: 1. in the fast descending stage, the slide block moves downwards from the upper dead point until the upper die contacts the plate, and the speed is high in the stage and the load is small; the speed is generally in the range of 150 mm/s-200 mm/s, the load basically overcomes the gravity of the sliding block, the gravity of the sliding block is generally not more than 1/50 of the nominal bending force of the bending machine, and therefore the load is very small; this phase is typically high speed, low load; 2. in the working-in stage, the bending machine bends the plate, which is a typical low-speed and large-load stage, the speed is about 20mm/s, and the speed is about 1/10 of the fast-down speed; 3. and in the return stage, after the plate is bent, the sliding block moves upwards and returns to the top dead center, and the speed and the load of the sliding block are the same as those in the fast-down stage, and the sliding block is high-speed and low-load.
From the above, the working condition of the bending machine is the typical variable speed and variable load working condition. Because the transmission ratio of the ball screw transmission is fixed, the servo motor reaches the highest rotating speed n at the fast descending stagemaxBut peak torque MmaxFar from this, according to empirical data, generally 1/50, which is only the peak torque, the load can be directly equivalent to the output torque of the motor, and then the power consumed by the motor corresponding to the fast-down phase is:
and in the working stage, the motor reaches the peak torque MmaxHowever, according to empirical data, the rotational speed of the motor is only the maximum rotational speed n max1/10, mainly considering safety factors, the working speed of the bending machine is generally low, and the power required by the motor at this stage is as follows:
therefore, the driving system needs to meet the requirement of the highest rotating speed at the fast descending stage and the return stroke stage, and simultaneously needs to meet the requirement of the peak torque at the working process stage; then, with a fixed transmission ratio, the peak power: pmax＝nmax×Mmax. The required power of the driving motor is very large, and even in the actual use process, the highest peak power is not used by the motor, so that the power of the motor is not completely applied, namely, the power utilization rate is low. Taking a 35-ton mechanical-electric servo bending machine commonly available in the market as an example, the fast down speed and the return speed are generally 200mm/s, the nominal bending force is 350kN, in order to meet the requirements of the highest speed and the maximum bending force at the same time, 2 7.5kW servo motors are generally needed, and the conventional configuration of the market is adopted at present, but in the actual working process, the actually consumed power of the two servo motors is approximately 1 kW-2 kW, and the utilization rate of the power is very low.
Therefore, it is desired to solve the above problems.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model aims at providing a be fit for the large-tonnage, and have heavy load, high accuracy, low energy consumption, driving motor power is little, power utilization is high, fast and manufacturing cost low grade advantage, utilize the self-locking characteristic of the non-linear motion characteristic of link mechanism and specific position and the vice driven self-locking characteristic of screw thread simultaneously based on compound drive's full electric servo numerical control bender of mechanical type.
The technical scheme is as follows: in order to achieve the purpose, the utility model discloses a mechanical full-electric servo numerical control bending machine based on compound drive, which comprises a frame, a lower die fixedly connected with the frame and used for bending, a main slider capable of moving up and down along the frame, an auxiliary slider slidably connected with the main slider and capable of sliding up and down relatively, and an upper die fixedly connected with the auxiliary slider and matched with the lower die for bending, wherein the main slider is connected with a main driving mechanism used for driving the main slider to move together with the auxiliary slider, and the auxiliary slider is bilaterally and symmetrically connected with two auxiliary driving mechanisms used for driving the auxiliary slider to move relative to the main slider; a main guide assembly for guiding the main sliding block to move up and down is arranged at the corresponding position of the main sliding block and the frame; the auxiliary sliding block passes through the main sliding block and can slide up and down relative to the main sliding block.
The main driving mechanism comprises a main power component positioned on the rack, 2 symmetrically arranged main cranks driven by the main power component, and a main connecting rod connected with each main crank revolute pair, and the main connecting rods are hinged with the main sliding blocks; the main power assembly outputs power to drive the main crank to rotate, and the main sliding block and the auxiliary sliding block are driven to move up and down through the main connecting rod; the auxiliary driving mechanism comprises an auxiliary power assembly positioned on the rack, a screw rod driven by the auxiliary power assembly and hinged with the main sliding block, and a nut in threaded fit with the screw rod, and the nut is fixedly connected with the auxiliary sliding block; the auxiliary power assembly outputs power to drive the screw rod to rotate, and the auxiliary sliding block is driven to move up and down relative to the main sliding block through the threaded matching nut.
Preferably, the main power assembly comprises a main driving motor located on the frame, a main synchronizing shaft connected with an output shaft of the main driving motor through belt transmission, synchronizing shaft gears respectively located at two shaft ends of the main synchronizing shaft, and crank gears engaged with the synchronizing shaft gears, and the crank gears are coaxially arranged with the main crank and can drive the main crank to rotate.
Furthermore, the auxiliary power assembly comprises an auxiliary driving motor positioned on the rack, a small belt wheel positioned on an output shaft of the auxiliary driving motor, a large belt wheel coaxially and fixedly connected with the screw rod, and a synchronous belt wound on the small belt wheel and the large belt wheel.
Furthermore, the parallelism deviation of the upper die and the lower die can be adjusted by the asynchronous operation of 2 auxiliary driving motors which are arranged in bilateral symmetry.
Preferably, the main connecting rod is a connecting rod structure with adjustable length, and the connecting rod structure comprises a support, a worm which is positioned in the support and two shaft ends of which are hinged with the support, a worm wheel which is positioned in the support and is meshed with the worm, and an upper screw rod and a lower screw rod which are connected through threads and are arranged on the worm wheel in a penetrating manner, wherein the upper screw rod and the lower screw rod both penetrate out of the support; one shaft end of the worm is connected with a motor, and the motor is started to drive the worm gear and the worm to transmit, so that the upper screw rod and the lower screw rod are driven to move up and down along the worm gear to realize adjustable length; an upper thread matched with the upper screw rod and a lower thread matched with the lower screw rod are arranged in the worm wheel, and the thread pitches of the upper thread and the lower thread are different; the outer cylindrical surfaces of the upper screw and the lower screw are provided with two planes which are symmetrical to each other, and the corresponding positions of the support are provided with through holes which are matched with the upper screw and the lower screw to form a sliding pair.
Further, the nut is provided with a clearance eliminating mechanism, the clearance eliminating mechanism comprises a pressing block which is arranged on the screw rod in a penetrating mode together with the nut, a plurality of counter bores which are formed along the circumference of the pressing block in an evenly distributed mode in the reverse direction, a guide rod which penetrates through the counter bores and is fixed with the nut, and a spring which is sleeved on the guide rod, the guide rod is provided with a guide rod step surface, one end of the spring abuts against the guide rod step surface, the other end of the spring abuts against the counter bore step surface, and pre.
Preferably, the thread of the nut is provided with a taper with an inclination angle a for reducing stress concentration.
Furthermore, a plurality of grooves which are arranged along the circumferential direction and extend along the axial direction are arranged on the thread of the nut.
Furthermore, the movement stroke of the main crank is larger than that of the nut, the main driving mechanism drives the main sliding block and the auxiliary sliding block to realize high-speed, light-load and non-working stroke movement, and the auxiliary driving mechanism drives the auxiliary sliding block to realize low-speed, heavy-load and working stroke movement; or the motion stroke of the main crank is smaller than that of the nut, the main driving mechanism drives the main sliding block and the auxiliary sliding block to realize low-speed, heavy-load and work-stroke motion, and the auxiliary driving mechanism drives the auxiliary sliding block to realize high-speed, light-load and non-working stroke motion.
Has the advantages that: compared with the prior art, the utility model has the advantages of it is following:
(1) the utility model makes full use of the non-linear motion characteristic of the link mechanism and the self-locking characteristic of the specific position, and adopts two independent driving mechanisms to realize the fast-down, work-in and return actions of the bending machine according to the actual working condition characteristics of the numerical control bending machine; wherein, the fast-down and return actions are realized by a fast, low-load and large-stroke driving mechanism; the driving mechanism with low speed, small stroke and heavy load is adopted to realize the work-in bending, the performance is effectively improved, the cost is reduced, the high-speed heavy load is realized, and the driving mechanism has important significance for promoting the development of a numerical control bending machine from a traditional hydraulic driving mode to a mechanical-electric servo driving mode.
(2) The utility model discloses in because of link mechanism's nonlinear motion characteristic, under driving motor at the uniform velocity rotation condition, link mechanism is lower at its upper and lower dead point position's speed, and higher, the action is mild, do not have the impact at intermediate position speed.
(3) The utility model adopts a fast large-stroke driving mechanism to realize fast descending and returning actions, adopts a slow small-stroke driving mechanism with larger force increasing effect to realize feeding actions, adopts two driving mechanisms to cooperate with actions, and can greatly improve the power utilization rate of a servo motor, thereby realizing a heavy-load large-tonnage bending machine and overcoming the technical bottleneck in the industry;
(4) the utility model greatly improves the power utilization rate of the servo motor, the bending machine with the same tonnage can adopt a smaller driving motor, does not need expensive heavy-load and high-precision ball screws, and uses common parts such as cranks, connecting rods and the like, thereby effectively reducing the manufacturing cost, and having no maintenance and high reliability;
(5) the utility model can respectively drive the main driving mechanism and the auxiliary driving mechanism according to different process requirements, and the main driving mechanism and the auxiliary driving mechanism are matched to act, so that a plurality of processing modes are realized, and the combination is flexible;
(6) the main connecting rod of the utility model can be arranged into a connecting rod structure with adjustable length, when different molds are replaced, the distance between the upper and lower sliding blocks can be adjusted by adjusting the length of the connecting rod, the application range is large, and the adjustment precision is high;
(7) the utility model discloses in utilize the depth of parallelism deviation of the adjustable mould of going up of the asynchronous operation of the vice driving motor that 2 bilateral symmetry set up and lower mould, make the left and right sides nonparallel of lower slider, can realize taking tapered bending.
Drawings
FIG. 1 is a schematic diagram of a bending machine in the prior art;
FIG. 2 is a schematic view of a prior art bending of a sheet material;
FIG. 3 is a schematic diagram of the present invention;
FIG. 4 is a schematic structural view of the present invention;
FIG. 5 is a schematic structural view of the main driving mechanism of the present invention;
FIG. 6 is a schematic structural view of the auxiliary driving mechanism of the present invention;
fig. 7 is a schematic structural view of the middle link structure of the present invention;
FIG. 8 is a schematic view of the connection of worm and worm gear in the connecting rod structure of the present invention;
fig. 9 is a schematic connection diagram of the worm wheel, the upper screw rod and the lower screw rod in the connecting rod structure of the present invention;
fig. 10 is a schematic end view of the upper screw rod and the lower screw rod in the connecting rod structure of the present invention;
fig. 11 is a schematic structural view of the middle gap eliminating mechanism of the present invention;
fig. 12 is a schematic cross-sectional view of the backlash eliminating mechanism of the present invention;
fig. 13 is a schematic view of the taper of the nut of the present invention;
fig. 14 is a schematic view of a groove on the nut of the present invention;
fig. 15(a) -15 (c) are schematic diagrams of the movement in the lower stage of embodiment 1 of the present invention;
fig. 16(a) -16 (b) are schematic diagrams of the movement in the working stage in embodiment 1 of the present invention;
fig. 17 is a schematic view of the non-linear motion characteristic of the middle link mechanism according to the present invention.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 3, the utility model relates to a full electric servo numerical control bender of mechanical type based on combined drive, include frame 1, lower mould 2, main slider 3, vice slider 4 and go up mould 5. The main sliding block 3 is connected with the frame 1 in a sliding manner and can move up and down along the frame 1, main guide grooves 31 for guiding sliding are symmetrically arranged on the left and right of the main sliding block 3, main guide blocks 32 which are inserted into the main guide grooves 31 and can slide up and down along the main guide grooves 31 are arranged at corresponding positions on the frame, and the main guide grooves 31 and the main guide blocks 32 form a main guide assembly; vice slider 4 and main slider sliding connection and can slide from top to bottom relatively the main slider, set up on the main slider 3 and supply vice slider 4 to pass and play the gliding vice guide way 33 of direction, the bilateral symmetry is provided with the gliding vice guide block 34 from top to bottom along vice guide way 33 on vice slider 4, and vice slider 4 passes vice guide way 33, and vice guide block 34 slides from top to bottom along vice guide way 33. The upper die 5 and the lower die 2 are matched with each other to realize bending, wherein the upper die 5 is fixed on the auxiliary sliding block 4 and can move up and down along with the auxiliary sliding block 4, and the lower die 2 is fixed on the rack 1.
As shown in fig. 4 and 5, the main slider 3 is connected with a main driving mechanism for driving the main slider and the auxiliary slider to move, the main driving mechanism includes a main power assembly, main cranks 6 and main connecting rods 7, the main upper cranks 6 are arranged symmetrically left and right and driven by the same main power assembly, each main crank 6 is connected with a main connecting rod 7 in a rotating pair, and the main connecting rods 7 are hinged with the main slider. The upper power assembly comprises a main driving motor 10 positioned on the rack, a main synchronizing shaft 11 connected with an output shaft of the main driving motor through belt transmission, synchronizing shaft gears 12 respectively positioned at two shaft ends of the main synchronizing shaft and crank gears 13 meshed with each synchronizing shaft gear, wherein the crank gears 13 are coaxially arranged with the main crank 6 and can drive the main crank 6 to rotate. The belt transmission comprises a driving wheel connected with an output shaft of the main driving motor, a driven wheel arranged on the main synchronizing shaft 11 and a synchronous belt wound on the driving wheel and the driven wheel to realize transmission. The two shaft ends of the main synchronizing shaft 11 are hinged with the frame and can rotate along the axis. The central shaft of the crank gear 13 is arranged on the main crank 6 in a penetrating way and is hinged with the frame. The main driving motor 10 is started, the main synchronizing shaft 11 is driven to rotate through belt transmission, the synchronizing shaft gears 12 on the left side and the right side are driven to rotate simultaneously, the synchronizing shaft gears 12 and the crank gears 13 are in gear engagement transmission, the main crank 6 which is coaxially arranged is driven to rotate, and the main sliding block 3 and the auxiliary sliding block 4 are driven to move up and down through the main connecting rod 7. The utility model discloses a main connecting rod 7 is the link structure with adjustable length, as shown in fig. 7, fig. 8 and fig. 9, this link structure includes support 18, worm 19, worm wheel 20, goes up screw rod 21, lower screw rod 22 and motor 23. The motor 23 is fixedly connected with one shaft end of the worm 19 and is used for driving the worm 19 to rotate. The worm 19 is positioned in the support 18, two shaft ends are hinged with the support 18, and the worm wheel 20 is positioned in the support 18 and meshed with the worm to form a worm and gear transmission pair. The worm wheel 20 is internally provided with an upper thread matched with the upper screw rod and a lower thread matched with the lower screw rod, and the thread pitches of the upper thread and the lower thread are different. The upper screw 21 and the lower screw 22 are threaded on the worm wheel 20, the upper screw and the lower screw both penetrate out of the support 18, and the extended upper screw 21 and the extended lower screw 22 are used for hinging other parts. The motor 23 is started to drive the worm gear to drive, so that the upper screw 21 and the lower screw 22 are driven to move up and down along the worm gear, and the length of the connecting rod structure is adjustable. The pitch of the upper thread is P1, the pitch of the lower thread is P2, the worm wheel rotates for a circle, the length adjustment quantity delta which can be realized by the connecting rod structure is P1-P2, and the adjustment precision of the connecting rod is effectively improved. As shown in fig. 10, the outer cylindrical surfaces of the upper screw 21 and the lower screw 22 are provided with two planes 24 that are symmetrical to each other, the corresponding positions of the support are provided with through holes 25 that are matched with the upper and lower screws to form a sliding pair, the surfaces of the through holes 25 that are matched with the planes 24 and guided are also planes, and the surfaces that are matched with the thread surfaces can be thread surfaces or other surfaces that can have a guiding function.
As shown in fig. 4 and 6, two auxiliary driving mechanisms for driving the auxiliary sliding block to move relative to the main sliding block are symmetrically connected to the auxiliary sliding block 4 from left to right, each auxiliary driving mechanism comprises an auxiliary power assembly, a lead screw 8 and a nut 9, the lead screw 8 is driven by the auxiliary power assembly, the lead screw 8 and the nut 9 are in threaded fit transmission, and the nut 9 is fixedly connected with the auxiliary sliding block 4. The auxiliary power assembly comprises an auxiliary driving motor 14 positioned on the rack, a small belt wheel 15 positioned on an output shaft of the auxiliary driving motor, a large belt wheel 16 coaxially and fixedly connected with the screw rod, and a synchronous belt 17 wound on the small belt wheel and the large belt wheel. The auxiliary driving motor 14 is fixedly arranged on the main sliding block 3, one end of the screw rod 8 is fixedly provided with a large belt wheel 16, the middle of the large belt wheel is hinged with the main sliding block 3, and the lower end of the large belt wheel is matched with the nut 9 to form a thread pair. The auxiliary driving motor 14 is started to drive the small belt wheel 15 to rotate and drive the large belt wheel 16 to rotate through the synchronous belt 17, the screw rod 8 and the nut 9 form a thread transmission pair, the screw rod rotates, and the auxiliary sliding block 4 is driven to move up and down relative to the main sliding block 3 through the thread transmission pair. The utility model discloses the depth of parallelism deviation of the adjustable mould of going up of 14 asynchronous operation of the vice driving motor of usable 2 bilateral symmetry settings and lower mould. The nut 9 of the present invention is provided with a gap eliminating mechanism, as shown in fig. 11 and 12, which includes a pressing block 26, a guide rod 28 and a spring 29. The pressing block 26 and the nut 9 are arranged on the screw rod 8 in a penetrating mode, and the thread pitch and the thread rotating direction of the pressing block 26 are the same as those of the nut 9. A plurality of counter bores 27 are uniformly distributed along the circumferential direction of the pressing block 26, a guide rod step surface is arranged on the guide rod 28, the guide rod 28 penetrates through the counter bores 27 to be fixedly connected with the nut 9, and a moving pair is formed between the outer wall surface of the guide rod and the wall surface of the hole of the pressing block to play a role in guiding. The spring 29 is sleeved on the guide rod 28, one end of the spring 29 abuts against the step surface of the guide rod, the other end of the spring 29 abuts against the step surface of the counter bore, pre-pressing load is formed, and therefore the purpose of eliminating the gap is achieved, and the spring 29 is preferably a butterfly spring. Only have few rings of screw thread bearing load when the vice transmission of common screw thread, very easily arouse the stress concentration destruction of screw thread, have very big quality safety hidden danger, as shown in fig. 13, the utility model discloses in be equipped with the tapering that is used for reducing stress concentration's inclination for an on the screw thread of nut 9, can effectively reduce thread engagement's rigidity, increase the number of turns of atress screw thread, and then reach the purpose that reduces stress concentration. The main restriction factor of screw thread transmission speed limit and load-carrying capacity is lubricated and heat dissipation problem, consequently as shown in fig. 14, the utility model discloses set up a plurality of at the screw thread of nut 9 and arrange and follow the slot 30 that the axis direction extends along the circumferencial direction, through slot 30, inside lubricating oil easily flowed into the screw thread, be convenient for lubricate and dispel the heat, and do not have the influence to screw thread auxiliary drive's rigidity and intensity.
The utility model discloses a main crank 6's motion stroke is greater than the motion stroke of nut 9, and main actuating mechanism drives the main slide and realizes high-speed big stroke motion together with vice slider, and vice actuating mechanism drives vice slider and realizes the motion of low-speed little stroke. The working condition of the bending machine is a typical variable speed and variable load working condition, the fast descending and returning stages are high-speed and low-load large-stroke movement stages, and the working advancing stage is a low-speed and large-load small-stroke movement stage. Therefore the utility model discloses a main actuating mechanism drives main slider and realizes fast down and return stage, and vice actuating mechanism drives vice slider and realizes that the worker advances the stage. As shown in fig. 15(a), the main slider 3 is at the top dead center, i.e., the main crank 6 and the main link 7 are collinear and coincide. The utility model discloses a fast lower stage is as shown in fig. 15(b), main driving motor 10 starts, rotate through belt drive main synchronizing shaft 11, the synchronizing shaft gear 12 who drives the left and right sides simultaneously rotates, synchronizing shaft gear 12 and crank gear 13 gear engagement transmission, it is omega 1 to drive the main crank 6 of coaxial setting and rotate its rotational speed, it is down fast together with vice slider 4 to drive main slider 2 through main connecting rod 7, it finishes to reach the position shown in fig. 15(c) promptly fast lower stage, main slider 2 is located the bottom dead center this moment, main crank 6 and main connecting rod 7 collineation promptly, but both do not coincide, main actuating mechanism is in the auto-lock position this moment, main driving motor 10 only need provide very little driving torque promptly, do not provide driving torque even, can bear very big load of bending. And because the length of the main crank 6 is large, the effect of quick descending and large stroke in the quick descending stage can be realized. The utility model discloses make full use of when the main slide block is in two positions of top dead center and bottom dead center, the mechanism is in the auto-lock position. As shown in fig. 17, the typical nonlinear motion characteristic of the link mechanism is low in speed and small in impact at the start and end of the fast-downward motion. As shown in fig. 16(a) and 16(b), the auxiliary driving motors 14 on the left and right sides are started to drive the small belt wheel 15 to rotate and drive the large belt wheel 16 to rotate through the synchronous belt 17, the screw rods 8 and the nuts 9 form a screw transmission pair, the screw rods 8 rotate, the rotation speeds of the two screw rods 8 are omega 2 and omega 3, and the auxiliary sliding block 4 is driven to move up and down relative to the main sliding block 3 through the screw transmission pair. Thread pair drives are generally limited by the heat generated by friction present, i.e., there is a limit to F 'x V, where F' is the load carrying capacity and V is the operating speed. Therefore, the utility model makes full use of the characteristic, the fast descending stage and the return stage, the main slide block driving mechanism acts, the screw rod does not rotate and is in a self-locking state, and the high-speed, light-load and non-working stroke movement is realized; in the process of working, the main sliding block movement mechanism is in a self-locking position, and low-speed, heavy-load and working stroke movement is realized through screw driving. In order to realize low-speed, heavy-load and engineering movement, the driving motor improves the driving torque of the screw through the speed reducing mechanism, and simultaneously reduces the screw pitch of the screw to realize low-speed heavy-load driving.
The utility model discloses in can make up fast lower stage and worker's advance stage, realize different processing modes, take different mode according to the operating mode difference, reach the light load fast, heavy load slow effect, promote driving motor power utilization.
A fast mode: only a fast-descending stage is adopted, namely when the thin plate is bent, the bending processing can be finished only by driving the main sliding block to move up and down along with the auxiliary sliding block through the main driving mechanism due to small load, and the speed is high;
the heavy load mode: firstly, performing quick descending and then performing a working process, namely, firstly performing quick descending, and after the main sliding block reaches a bottom dead point, starting to operate the auxiliary sliding block to bend;
mixed mode: the fast descending stage and the working progress stage act simultaneously;
small opening bending mode: the main sliding block stays at the bottom dead center or moves upwards for a small distance, only the auxiliary sliding block moves linearly in a small stroke range to bend, and the mode is only suitable for bending small-size and simple parts and is high in efficiency.
Example 2
The structure of example 2 is the same as that of example 1, except that: the movement stroke of the main crank 6 is smaller than that of the nut 9, the main driving mechanism drives the upper sliding block to realize low-speed small-stroke movement, and the auxiliary driving mechanism drives the lower sliding block to realize high-speed large-stroke movement. The working condition of the bending machine is a typical variable speed and variable load working condition, the fast descending and returning stages are high-speed and low-load large-stroke movement stages, and the working advancing stage is a low-speed and large-load small-stroke movement stage. Therefore the utility model discloses a slider realization is fast down and is returned the journey stage under vice actuating mechanism drives, and main actuating mechanism drives the top shoe and realizes the worker and advance the stage.
Claims (10)
1. The utility model provides a mechanical type full electric servo numerical control bender based on combined drive which characterized in that: the bending machine comprises a rack (1), a lower die (2) fixedly connected with the rack and used for bending, a main sliding block (3) capable of moving up and down along the rack, an auxiliary sliding block (4) connected with the main sliding block in a sliding manner and capable of sliding up and down relatively, and an upper die (5) fixedly connected with the auxiliary sliding block and matched with the lower die for bending, wherein the main sliding block (3) is connected with a main driving mechanism used for driving the main sliding block and the auxiliary sliding block to move together, and the auxiliary sliding block (4) is symmetrically connected with two auxiliary driving mechanisms used for driving the auxiliary sliding block to move relative to the main sliding; a main guide assembly for guiding the main sliding block to move up and down is arranged at the corresponding position of the main sliding block (3) and the rack (1); the auxiliary sliding block (4) penetrates through the main sliding block (3) and can slide up and down relative to the main sliding block.
2. The mechanical full-electric servo numerical control bending machine based on the compound drive according to claim 1, is characterized in that: the main driving mechanism comprises a main power component positioned on the rack, 2 symmetrically arranged main cranks (6) driven by the main power component, and a main connecting rod (7) connected with each main crank revolute pair, and the main connecting rods (7) are hinged with the main sliding blocks (3); the main power component outputs power to drive the main crank (6) to rotate, and the main sliding block (3) and the auxiliary sliding block (4) are driven to move up and down through the main connecting rod (7); the auxiliary driving mechanism comprises an auxiliary power assembly positioned on the rack, a screw rod (8) driven by the auxiliary power assembly and hinged with the main sliding block (3), and a nut (9) in threaded fit with the screw rod, and the nut (9) is fixedly connected with the auxiliary sliding block (4); the auxiliary power assembly outputs power to drive the screw rod (8) to rotate, and the auxiliary sliding block (4) is driven to move up and down relative to the main sliding block (3) through the threaded matching nut (9).
3. The mechanical full-electric servo numerical control bending machine based on the compound drive according to claim 2, is characterized in that: the main power assembly comprises a main driving motor (10) positioned on the rack, a main synchronizing shaft (11) connected with an output shaft of the main driving motor through belt transmission, synchronizing shaft gears (12) respectively positioned at two shaft ends of the main synchronizing shaft and crank gears (13) meshed with the synchronizing shaft gears, wherein the crank gears (13) are coaxially arranged with the main crank (6) and can drive the main crank (6) to rotate.
4. The mechanical full-electric servo numerical control bending machine based on the compound drive according to claim 2, is characterized in that: the auxiliary power assembly comprises an auxiliary driving motor (14) positioned on the rack, a small belt wheel (15) positioned on an output shaft of the auxiliary driving motor, a large belt wheel (16) coaxially and fixedly connected with the screw rod, and a synchronous belt (17) wound on the small belt wheel and the large belt wheel.
5. The mechanical full-electric servo numerical control bending machine based on the compound drive according to claim 4, is characterized in that: the parallelism deviation of the upper die and the lower die can be adjusted by the asynchronous operation of 2 auxiliary driving motors (14) which are arranged in bilateral symmetry.
6. The mechanical full-electric servo numerical control bending machine based on the compound drive according to claim 2, is characterized in that: the main connecting rod (7) is of a connecting rod structure with adjustable length, the connecting rod structure comprises a support (18), a worm (19) which is positioned in the support and two shaft ends of which are hinged with the support, a worm wheel (20) which is positioned in the support and is meshed with the worm, and an upper screw rod (21) and a lower screw rod (22) which are connected with the worm wheel in a penetrating way through threads, and both the upper screw rod and the lower screw rod penetrate out of the support; one shaft end of the worm is connected with a motor (23), the motor (23) is started to drive the worm gear and the worm to transmit, so that the upper screw rod (21) and the lower screw rod (22) are driven to move up and down along the worm gear to realize adjustable length; an upper thread matched with the upper screw and a lower thread matched with the lower screw are arranged in the worm wheel (20), and the thread pitches of the upper thread and the lower thread are different; the outer cylindrical surfaces of the upper screw rod (21) and the lower screw rod (22) are provided with two mutually symmetrical planes (24), and the corresponding positions of the support are provided with through holes (25) which are matched with the upper screw rod and the lower screw rod to form a moving pair.
7. The mechanical full-electric servo numerical control bending machine based on the compound drive according to claim 2, is characterized in that: the nut (9) is provided with a clearance eliminating mechanism, the clearance eliminating mechanism comprises a pressing block (26) which is arranged on the screw rod (8) in a penetrating way together with the nut (9), a plurality of counter bores (27) which are uniformly distributed along the circumference of the pressing block in a reverse direction, a guide rod (28) which penetrates through the counter bores and is fixed with the nut, and a spring (29) which is sleeved on the guide rod, the guide rod is provided with a guide rod step surface, one end of the spring (29) is abutted against the guide rod step surface, the other end of the spring (29) is abutted against the counter bore step.
8. The mechanical full-electric servo numerical control bending machine based on the compound drive according to claim 2, is characterized in that: the thread of the nut (9) is provided with a taper with an inclination angle a for reducing stress concentration.
9. The mechanical full-electric servo numerical control bending machine based on the compound drive according to claim 2, is characterized in that: the thread of the nut (9) is provided with a plurality of grooves (30) which are arranged along the circumferential direction and extend along the axial direction.
10. The mechanical full-electric servo numerical control bending machine based on the compound drive according to claim 2, is characterized in that: the motion stroke of the main crank (6) is larger than that of the nut (9), the main driving mechanism drives the main sliding block and the auxiliary sliding block to realize high-speed, light-load and non-working stroke motion, and the auxiliary driving mechanism drives the auxiliary sliding block to realize low-speed, heavy-load and working stroke motion; or the motion stroke of the main crank (6) is smaller than that of the nut (9), the main driving mechanism drives the main sliding block and the auxiliary sliding block to realize low-speed, heavy-load and work-stroke motion, and the auxiliary driving mechanism drives the auxiliary sliding block to realize high-speed, light-load and non-working stroke motion.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110280632A (en) * | 2019-07-22 | 2019-09-27 | 南京邮电大学 | The mechanical full electric servo numerical control bender of high-speed overload based on composite drive |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110280632A (en) * | 2019-07-22 | 2019-09-27 | 南京邮电大学 | The mechanical full electric servo numerical control bender of high-speed overload based on composite drive |
| CN110280632B (en) * | 2019-07-22 | 2024-03-26 | 南京邮电大学 | High-speed heavy-load mechanical all-electric servo numerical control bending machine based on compound drive |
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| GR01 | Patent grant | ||
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Assignee: Zhangjiagang Institute of Zhangjiagang Assignor: NANJING University OF POSTS AND TELECOMMUNICATIONS Contract record no.: X2020980007094 Denomination of utility model: Mechanical all electric servo CNC bending machine based on compound drive Granted publication date: 20200421 License type: Common License Record date: 20201026 |
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| EE01 | Entry into force of recordation of patent licensing contract |