EP4129512A1

EP4129512A1 - Multi-drive combined bending machine

Info

Publication number: EP4129512A1
Application number: EP21905430.1A
Authority: EP
Inventors: Lixin Wang; Jun Wang; Zhenguang Li; Lei Zhang
Original assignee: Deartech Machine Tool Suzhou Corp Ltd
Current assignee: Deartech Machine Tool Suzhou Corp Ltd
Priority date: 2020-12-14
Filing date: 2021-11-18
Publication date: 2023-02-08
Also published as: CN112692113B; EP4129512A4; CN112692113A; WO2022127501A1

Abstract

The present invention discloses a multi-drive combined bending machine, which includes a bending component, a driving component and a transmission component. Two ends of the transmission component are respectively connected to the bending component and the driving component. The transmission component includes a transmission member and a mounting member arranged on the transmission member. The mounting member is provided with a connecting member fixedly connected thereto at one end, and the connecting member is sleeved with the bending component rotatable relative thereto. A rotating member sleeved on the connecting member and rotatable relative to the connecting member is arranged between the mounting member and the bending component. The bending component is capable of abutting against the rotating member, so as to rotate relative to the connecting member under an applied force.

Description

Technical field

The present invention relates to the technical field of bending machines, and in particular to a multi-drive combined bending machine.

Background

The description in this section merely provides background information related to the present invention, and does not necessarily constitute the prior art.
The existing pure electric servo bending machine on the market is a new development direction of the bending machine industry at present due to its advantages of energy saving, high efficiency, quick response and no need of hydraulic oil. However, due to the influence of load, bending deformation, deformation caused by eccentric loading and other factors, the current pure electric servo bending machine still has technical bottlenecks.
The existing pure electric servo bending machine usually adopts a screw/nut set as the transmission structure, and generally uses a combination of a single screw and a servo motor as the transmission form. Due to the limitation of the load characteristics of the ball screw, it is difficult for the existing pure electric servo bending machine to be applied to occasions with large load. Besides, in the bending process, the sliding plate will be deformed to some extent due to its abutting operation. In the related art, a combination of a compensating component and a data processing component is used to eliminate this deformation, which, however, is based on the situation that the force bearing points on both ends of the sliding plate are hinged. In the screw/nut set structure in the related art, since the fixation is at the force bearing point of the sliding plate, when the sliding plate is deformed, the nut will drive the screw to deviate from its theoretical position, causing poor bending accuracy and reliability. In addition, in the bending process, the screw will be subject to a rapid reciprocating radial force, which will cause the screw to swing. Combined with the operating characteristics of the screw, the screw may be prone to failure, which greatly reduces the transmission efficiency and service life of the screw.
It should be noted that, the foregoing description of the technical background is only for ease of describing the technical solutions of the invention clearly and completely, and is described for ease of understanding by a person skilled in the art. The foregoing technical solutions cannot be considered as known to a person skilled in the art only because the solutions are described in the background part of the present invention.

Summary

In order to overcome the defects in the related art, embodiments of the present invention provide a multi-drive combined bending machine. Under the cooperation of a rotating member, a transmission component and a bending component, the transmission component is ensured not to be deformed before and after the bending component is deformed, so that the transmission members will not fail.
An embodiment of the present application discloses a multi-drive combined bending machine, which includes a bending component, a driving component and a transmission component. Two ends of the transmission component are respectively connected to the bending component and the driving component so that the transmission component is capable of driving the bending component to move toward a material to be bent under the action of the driving component.
The transmission component includes a transmission member and a mounting member arranged on the transmission member. The mounting member is provided with a connecting member fixedly connected thereto at one end, and the connecting member is sleeved with the bending component rotatable relative thereto. A rotating member sleeved on the connecting member and rotatable relative to the connecting member is arranged between the mounting member and the bending component. The bending component is capable of abutting against the rotating member, so as to rotate relative to the connecting member under an applied force.
Further, there are a plurality of the transmission members, and the plurality of transmission members are symmetrically arranged with respect to the bending component and located at inner and outer sides of the bending component.
Further, the connecting member includes a tie rod with a fixed end being threadedly locked with the mounting member and a free end running through the bending component, and the rotating member includes a thrust joint bearing fixedly arranged on the mounting member and having a preset clearance with an outer side wall of the tie rod.
Further, the bending component includes a vertical plate and a bending portion arranged on the vertical plate. The vertical plate is provided with a mounting notch extending along an inner and outer side direction thereof. The free end of the tie rod is capable of extending into the mounting notch after running through a part of the vertical plate structure along a moving direction of the bending component. The free end of the tie rod is provided with a locking member capable of abutting against an inner side wall of the vertical plate.
Further, a conical member and a spherical member sleeved on the tie rod are further arranged between the locking member and the inner side wall of the vertical plate. A conical surface of the conical member abuts against a spherical surface of the spherical member.
Further, the multi-drive combined bending machine further includes a guide rail extending along the moving direction of the bending component. The guide rail is slidably provided with a guide member capable of being fixedly connected to the vertical plate.
Further, the transmission member includes ball screws extending along a moving direction of the bending component. The mounting member comprises a nut seat, which is threadedly connected with two of the ball screws running through the nut seat, and each of the ball screws corresponds to one of the driving component respectively.
Further, the nut seat is provided with a plurality of lubricating through holes extending to the ball screws, and the lubricating through hole is provided with an oil nozzle.
Further, the driving component includes a servo motor, a first pulley member, a synchronous belt and a second pulley member. An output end of the servo motor is drivingly connected to the first pulley member. The second pulley member is drivingly connected to the transmission component. The timing belt is arranged on the first pulley member and the second pulley member, so as to transmit driving force of the servo motor to the transmission component.
Further, a bearing member running through the ball screws is arranged between the second pulley member and the transmission component. The bearing member includes a gland, a bearing seat and a plurality of thrust angular contact ball bearings.
With reference to the foregoing technical solutions, the beneficial effects of the present invention are analyzed as follows:

1. By arranging the bending component and the rotating member in the present application, when the vertical plate of the bending component is arched upward, only the rotating member rotates a corresponding angle under the action of the vertical plate, and the relative position between the connecting member, the mounting member and the transmission members does not change after the vertical plate is arched upward, so that the transmission members will not fail in the related art.
2. By arranging the driving component and the transmission component in the present application, since the transmission members in each group are symmetrically arranged with respect to the vertical plate and located at the inner and outer sides of the vertical plate, there may be two transmission members arranged at each fixing point of the vertical plate, which doubles the original load. In addition, by using the two-point fixing method, the bending machine of the present invention can work effectively with the numerical control system and the compensation mechanism in the related art on the premise of completely avoiding the failure of the ball screws, so as to realize precise compensation.

To make the foregoing and other objectives, features, and advantages of the present invention easier to understand, a detailed description is made below by using listed preferred embodiments with reference to the accompanying drawings.

Brief description of the drawings

To describe the technical solutions in embodiments of this application or in the existing technology more clearly, the following briefly describes the accompanying drawings required for describing the embodiments or the existing technology. Apparently, the accompanying drawings in the following description show merely some embodiments of the present invention, and a person of ordinary skill in the art may derive other drawings from these accompanying drawings without creative efforts.

FIG. 1 is an overall schematic diagram of a multi-drive combined bending machine according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a machine frame according to an embodiment of the present invention;
FIG. 3 is a partial schematic diagram according to an embodiment of the present invention;
FIG. 4 is a partial sectional view of a transmission component according to an embodiment of the present invention;
FIG. 5 is a partial enlarged view of A in FIG. 4; and
FIG. 6 is a partial top view according to an embodiment of the present invention.

Reference numerals of the drawings: 1, bending component; 2, driving component; 3, transmission component; 4, connecting member; 5, rotating member; 6, guide rail; 7, guide member; 11, vertical plate; 12, bending portion; 13, mounting notch; 21, servo motor; 22, first pulley member; 23, synchronous belt; 24, second pulley member; 25, gland; 26, bearing seat; 27, thrust angular contact ball bearing; 31, ball screw; 32, nut seat; 33, lubricating through hole; 34, oil nozzle; 41, locking member; 42, conical member; and 43, spherical member.

Detailed description

The technical solutions of embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are merely a part rather than all of the embodiments of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
It should be noted that in the descriptions of the present invention, terms "first" and "second" are only used to describe the objective and distinguish similar objects without a limitation on a sequence between the two, and cannot be understood as indicating or implying relative importance. In addition, in descriptions of the present invention, "a plurality of" means two or more, unless otherwise stated.
As shown in FIG. 1 to FIG. 6, this embodiment discloses a multi-drive combined bending machine, which includes a bending component 1, a driving component 2 and a transmission component 3. The above-mentioned components may be arranged on a machine frame according to mounting needs. Two ends of the transmission component 3 are respectively connected to the bending component 1 and the driving component 2 so that the transmission component 3 is capable of driving the bending component 1 to move toward a material to be bent under the action of the driving component 2, thereby effectively completing the bending procedure. The bending machine in the present application can work with the numerical control system in the related art to complete the required operations more intelligently.
As shown in FIG. 1 and FIG. 2, in this implementation, the machine frame includes a first wall plate and a second wall plate extending along a vertical direction and arranged at an interval, and a plurality of connecting plates 11 and reinforcing ribs disposed horizontally between the first wall plate and the second wall plate. The first wall plate and the second wall plate are provided with lifting lugs. The number of the lifting lugs may be two or a multiple of two. In this way, if the machine frame is to be moved, the machine frame may be fixed to an external apparatus through the lifting lugs, and then the machine frame can be moved conveniently. According to the requirements for hardness, weight and other parameters, the machine frame may be made of a steel material, or a combination of a steel material and other materials, which is not limited and described here.
As shown in FIG. 1, in this implementation, the transmission component 3 is arranged above the bending component 1, the driving component 2 is arranged above the transmission component 3, and the driving component 2 is arranged on the machine frame. As shown in FIG.3, the bending component 1 includes the vertical plate 11 extending along the vertical direction and a bending portion 12 arranged on the vertical plate 11. Preferably, the bending portion 12 is arranged at or near a lower end of the vertical plate 11. The bending portion 12 is composed of a tool pressing member and a mounting member. The bending portion 12 is adaptively arranged according to different requirements for angle, position and other parameters of the material to be bent.
In this implementation, as showed in FIG.3, the driving component 2 adopts a pure electric servo drive manner, and specifically includes a pure electric servo motor 21, a first pulley member 22, a synchronous belt 23 and a second pulley member 24. In order to have the characteristics of compact structure and small occupied space, the above structure may be preferably mounted in the following manner. The pure electric servo motor 21 is fixedly arranged on the machine frame, and an output shaft of the pure electric servo motor extends along the vertical direction. The first pulley member 22 may be a relatively small pulley that can be drivingly connected to the pure electric servo motor 21 and located above the pure electric servo motor 21. The second pulley member 24 may be a relatively big pulley. The first pulley member 22 and the second pulley member 24 are arranged in a same horizontal plane, and can both be engaged with the synchronous belt 23 to realize a transmission connection.
According to the above arrangement, when in use, the pure electric servo motor 21 outputs a preset speed to drive the first pulley member 22 to rotate, and the first pulley member 22 can effectively drive the second pulley member 24 to rotate through the synchronous belt 23, so that the driving force of the pure electric servo motor 21 is effectively transmitted. Of course, the first pulley member 22 and the second pulley member 24 may also be other transmission structures such as gears, which are not limited and described here.
As shown in FIG. 1 and FIG. 3-FIG. 6, due to the influence of the mechanical limit of the worktable and other structures and the bending force, in the bending process, the vertical plate 11 of the bending component 1 may be arched (deformed) upward in the middle from the two fixed ends, and may also slightly deflect left and right. The deformation and the deflection are manifestations of the rotation of the bending component relative to the connecting member 4.
In the related art, a screw/nut set is usually used as the transmission component 3, and the vertical plate 11 is fixed with the nut in a rigid connection manner. On the one hand, the above-mentioned deformation may cause the screw to swing along its radial direction all the time under the action of the deforming force, which will cause failures of the screw/nut set such as breakage of the fixed end of the screw. On the other hand, in the traditional mounting and fixing manner, the bolt needs to be aligned with a plurality of parts before running through and being locked with the parts, the locking procedure can only be achieved after ensuring the machining accuracy between the parts, which increases the machining difficulty. However, the technical solution of the transmission component 3 in this embodiment can effectively solve the above technical problems.
In this implementation, the transmission component 3 includes a transmission member and a mounting member arranged on the transmission member. The mounting member is provided with a connecting member 4 fixedly connected thereto at one end. The connecting member 4 is sleeved with the bending component rotatable relative thereto. A rotating member 5 sleeved on the connecting member 4 and rotatable relative to the connecting member 4 is arranged between the mounting member and the bending component. The bending component 1 is capable of abutting against the rotating member 5, so as to rotate relative to the connecting member 4 under an applied force. With the arrangement of the above structure, when the vertical plate 11 of the bending component 1 is arched upward, only the rotating member 5 rotates a corresponding angle under the action of the vertical plate 11, and the relative position between the connecting member 4, the mounting member and the transmission members does not change after the vertical plate 11 is arched upward, so that the transmission members will not fail as in the related art.
As shown in FIG.4, in one of the embodiments, the transmission member 30 is preferably a common ball screw member on the market. The ball screw member includes a ball screw31 extending along the vertical direction and a nut seat 32 threadedly sleeved on the ball screw 31. An upper end of the ball screw 31 is connected to the second pulley member 24 in a transmission manner, so that the ball screw 31 can rotate around its own axis under the action of the driving force of the pure electric servo motor 21, thereby driving the nut seat 32 to reciprocate along the vertical direction. The vertical plate 11 is connected to the nut seat 32, and can move synchronously along the vertical direction with the nut seat 32.
The ball screw members are preferably respectively arranged on the left side and the right side of the upper end of the vertical plate 11. The vertical plate 11 is correspondingly provided with a mounting notch 13 extending along an inner and outer side direction thereof. Preferably, the mounting notch 13 runs through the inner and outer sides of the vertical plate 11. The nut seat 32 is provided with a plurality of lubricating through holes 33 extending to the ball screws 31, and the lubricating through hole 33 is provided with an oil nozzle 34. Lubricating oil may be added to the oil nozzle 34 to act on the ball screw 31, thereby performing a lubrication function and prolonging the service life.
As shown in FIG 5, the connecting member 4 includes a tie rod extending along the vertical direction. A lower end surface of the nut seat 32 is provided with a threaded hole extending along the vertical direction. An upper surface of the vertical plate 11 is provided with a connecting hole extending along the vertical direction. The connecting hole can communicate with the mounting notch 13. The tie rod has an upper end threadedly locked in the threaded hole, and a lower end (free end) extending into the mounting notch 13 after running through the connecting hole. The free end of the tie rod is provided with a locking member 41 capable of abutting against an inner side wall of the vertical plate 11, so that the nut seat 32 can be connected to the vertical plate 11 through the tie rod.
The rotating member 5 includes a thrust joint bearing fixedly arranged on a lower surface of the nut seat 32 and capable of abutting against an upper end surface of the vertical plate 11. Due to its spherical sliding surface, the thrust joint bearing may also make a tilting motion (i.e., self-aligning motion) within a certain angle range. It is worth noting that both the vertical plate 11 and the thrust joint bearing form a clearance fit with the tie rod.
According to the above arrangement, when the vertical plate 11 is deformed, a sliding portion of the thrust joint bearing may rotate a corresponding angle with the vertical plate 11 through the arrangement of thrust joint bearing. In combination with the clearance fit, the deformed vertical plate 11 and the rotating thrust joint bearing may not contact the tie rod, thereby avoiding mechanical interference. Therefore, the relative position between the tie rod, the nut seat 32 and the ball screws 31 does not change after the vertical plate 11 is deformed, and the screw may not be subject to force in the radial direction, which is completely different from the related art. As a result, the ball screws 31 will not fail in the related art.
As shown in FIG. 1 and FIG. 3, in this implementation, there are a plurality of the transmission members. Preferably, the number of the transmission members is four, two in each group. The transmission members in each group are symmetrically arranged with respect to the vertical plate 11 and located at inner and outer sides of the vertical plate 11. The four transmission members operate synchronously, and the nut seats 32 of the transmission members in each group may be arranged integrally.
In the existing pure electric servo bending machine, limited by the connecting structure between the transmission component 3 and the bending component 1, one fixing point can only be provided with one pure electric servo motor 21, which may lead to the defect of small single-point load. In addition, if multi-point arrangement is used on the basis of the above structure to increase the load of the bending machine, the vertical plate 11 may be arched like waves in the vertical plane in the working process, which makes the bending machine fail to work with the numerical control system and the compensation mechanism in the related art to realize precise compensation.
In this implementation, with the above arrangement, there may be two transmission members arranged at each fixing point of the vertical plate 11, which doubles the original load. In addition, by using the two-point fixing method, the bending machine of the present invention can work effectively with the numerical control system and the compensation mechanism in the related art on the premise of completely avoiding the failure of the ball screws 31, so as to realize precise compensation.
As shown in FIG. 4 and FIG. 5, in this implementation, a conical member 42 and a spherical member 43 sleeved on the tie rod are further arranged between the locking member 41 and the inner side wall of the vertical plate 11. A conical surface of the conical member 42 abuts against a spherical surface of the spherical member 43. The conical member 42 is located above of spherical member 43. In the operation process of the two sets of transmission components 3, due to the errors caused by mechanical fit, the heights on the two sides of the vertical plate 11 may be slightly different. This problem can be solved by the spherical member 43 rotating relative to the conical member 42, which can avoid eccentric loading of the ball screws and lower the difficulty of mounting the vertical plate 11 to the machine frame. In this way, the bending portion 12 arranged on the vertical plate 11 have good parallelism with the worktable, and thus can accurately bend the material to be bent.
An elastic member sleeved on the tie rod is also arranged between conical member 42 and the inner side wall of the vertical plate 11. The elastic member includes a spring washer sleeved on the tie rod and abutting against the inner side wall of the vertical plate 11, and a disc spring located between the spring washer and the conical member 42. Due to its working environment, the vertical plate 11 needs to reciprocate rapidly in the vertical direction. The above flexible arrangement, on the one hand, can perform a cushioning function when the vertical plate 11 is lifted upward, and the other hand, can cooperate with the conical member 42 and the spherical member 43 to reduce the difficulty and cost in machining the vertical plate 11 and the nut seat 32.
In this implementation, a bearing member is arranged between the second pulley 24 and the transmission component 3. Specifically, the bearing member is located below the second pulley member 24 and runs through the transmission component 3. The bearing member includes a bearing seat 26 fixedly arranged on the machine frame, a plurality of thrust angular contact ball bearings 27 located on the bearing seat 26, and a gland 25 for limiting the thrust angular contact ball bearings 27. With the above arrangement, the bearing member has a large contact angle, and thus, is less affected by the centrifugal force and more suitable for the ball screws 31 rotating at high speed in the present application.
As shown in FIG. 1 and FIG. 3, the bending machine of the present application further includes a guide rail 6 arranged outside the vertical plate 11 along the vertical direction. The guide rail 6 is slidably provided with a guide member 7 capable of being fixedly connected to the vertical plate 11. The guide rail 6 is fixed relative to the machine frame, and thus, can perform a guide function when the vertical plate 11 reciprocates along the up-down direction.
Specific embodiments are used in this specification to describe the principle and implementations of the present invention. The foregoing embodiments are merely intended to help understand the method and core idea of the present invention. In addition, with respect to the implementations and the application scope, modifications may be made by a person of ordinary skill in the art according to the idea of the present invention. Therefore, the specification shall not be construed as a limitation on the present invention.

Claims

A multi-drive combined bending machine, characterized in that comprising a bending component, a driving component and a transmission component, wherein two ends of the transmission component are respectively connected to the bending component and the driving component so that the transmission component is capable of driving the bending component to move toward a material to be bent under the action of the driving component; and
the transmission component comprises a transmission member and a mounting member arranged on the transmission member, the mounting member is connected with a connecting member fixedly connected thereto at one end, the connecting member is sleeved with the bending componentrotatable relative thereto, a rotating member sleeved on the connecting member and rotatable relative to the connecting member is arranged between the mounting member and the bending component, and the bending component is capable of abutting against the rotating member, so as to rotate relative to the connecting member under an applied force.
The multi-drive combined bending machine according to claim 1, characterized in that there are a plurality of the transmission members, and the plurality of transmission members are symmetrically arranged with respect to the bending component and located at inner and outer sides of the bending component.
The multi-drive combined bending machine according to claim 1, characterized in that the connecting member comprises a tie rod with a fixed end being threadedly locked with the mounting member and a free end running through the bending component, and the rotating member comprises a thrust joint bearing fixedly arranged on the mounting member and having a preset clearance with an outer side wall of the tie rod.
The multi-drive combined bending machine according to claim 3, characterized in that the bending component comprises a vertical plate and a bending portion arranged on the vertical plate, the vertical plate is provided with a mounting notch extending along an inner and outer side direction thereof, the free end of the tie rod is capable of extending into the mounting notch after running through a part of the vertical plate structure along a moving direction of the bending component, and the free end of the tie rod is provided with a locking member capable of abutting against an inner side wall of the vertical plate.
The multi-drive combined bending machine according to claim 4, characterized in that a conical member and a spherical member sleeved on the tie rod are further arranged between the locking member and the inner side wall of the vertical plate, wherein a conical surface of the conical member abuts against a spherical surfaceof the spherical member.
The multi-drive combined bending machine according to claim 4, characterized in that further comprising a guide rail extending along the moving direction of the bending component, wherein the guide rail is slidably provided with a guide member capable of being fixedly connected to the vertical plate.
The multi-drive combined bending machine according to claim 1, characterized in that the transmission member comprises ball screws extending along a moving direction of the bending component, the mounting member comprises a nut seat(32), which is threadedly connected with two of the ball screws(31) running through the nut seat(32), and each of the ball screws corresponds to one of the driving components respectively.
The multi-drive combined bending machine according to claim 7, characterized in that the nut seat is provided with a plurality of lubricating through holes extending to the ball screws, and the lubricating through hole is provided with an oil nozzle.
The multi-drive combined bending machine according to claim 7, characterized in that the driving component comprises a servo motor, a first pulley member, a synchronous belt(23) and a second pulley member, wherein an output end of the servo motor is drivingly connected to the first pulley member, the second pulley member is drivingly connected to the transmission component, and the synchronous belt(23) is arranged on the first pulley member and the second pulley member, so as to transmit driving force of the servo motor to the transmission component.
The multi-drive combined bending machine according to claim 9, characterized in that a bearing member running through the ball screws is arranged between the second pulley member and the transmission component, and the bearing member comprises a gland, a bearing seat and a plurality of thrust angular contact ball bearings.