Distributed main transmission mechanism of large four-point servo press

Abstract

The invention belongs to the field of material pressure forming machining equipment, and particularly relates to a distributed main transmission mechanism of a large four-point servo press. Each servo driving assembly comprises a transmission assembly and one or more servo motors. The servo motor is installed on the machine body cross beam, the transmission assembly is controlled and driven to move through the servo motor, and then the sliding block located at the tail end of the transmission assembly is controlled and driven to move up and down in parallel. Compared with the prior art, by arranging the two sets of independent distributed servo driving assemblies, the torque of the driving assemblies on the two sides can be independently configured according to needs, then the unbalance loading resisting capacity is enhanced, and energy consumption can be reduced; the manufacturing errors of the structures on the two sides can be conveniently compensated through servo drive control; and the overall transmission structure of the large press machine is simplified, and the machining difficulty of a transmission part is reduced.

Description

Technical Field

[0001] The invention belongs to the field of material pressure forming processing equipment, in particular to a distributed main transmission mechanism of a large four-point servo press. Background Art

[0002] Forging production occupies an extremely important position in modern industry. Forging has fast forming speed, high production efficiency, high material utilization rate and low energy consumption. Therefore, the number of parts processed by forging accounts for a large proportion in all walks of life. With the development of modern society, there are more and more personalized needs, higher and higher requirements for product forming, and new materials are constantly emerging. This requires forging production equipment to have high adaptability and flexibility to meet the production needs of products of various specifications, types and materials. Traditional forging equipment is mostly rigid equipment, which is difficult to meet such production needs. Therefore, servo forging equipment with high controllability, high flexibility, high efficiency and energy saving has become a hot topic of research. With the application of servo presses in the field of high-precision and difficult-to-form parts in the automotive, home appliances, electronics and other industries, it has shown incomparable superiority over other presses and is the main direction of forging equipment development in the future.

[0003] At present, large servo presses (above 400 tons) are mostly driven by two points or four points due to their large tonnage and large worktable. At present, the main transmission mechanism of large servo presses is usually to replace the ordinary motor and clutch of the traditional mechanical press with one or more servo motors through gears to force synchronous drive, and transform the ordinary press into a servo press. Most of them adopt the two-point drive structure disclosed in patent CN118544630A and the four-point drive structure disclosed in patent CN104553013A. Both of them are driven by multiple servo motors on the left and right sides through mechanical gears to force synchronous drive the pressure slide block to move. This structure can realize the servo drive of large presses, but the gear tooth profiles on the left and right sides and the connection keyway and eccentric limiter must be strictly controlled during processing. In particular, the four-point drive structure disclosed in patent CN104553013A requires higher consistency between the two eccentric gears on the same axis, otherwise it is difficult to ensure the parallelism between the slide block and the lower worktable. The super-large structure gear is extremely difficult to process and difficult to assemble and adjust. Especially for large multi-station presses, the load difference between the left and right stations is large, and the overload can even reach 3:2. The torque output by the transmission disclosed in the above patent is the same. In order to meet the forming needs, the driving power of the motor must be increased, thereby increasing the energy consumption of the system. Summary of the invention

[0004] The purpose of the present invention is to provide a distributed main transmission mechanism and method for a large four-point servo press, which synchronously drives the movement of a slider by two groups of independent servo drive components distributed on the left and right sides of the press body, thereby realizing the control of the transmission structure in the two groups of independent servo drive components by the servo motor, and the driving torque on both sides can be configured according to needs, with strong anti-eccentric load capability and reduced energy consumption; the two points on the same side are driven by two connecting rods driven by the same eccentric gear, with a simple structure and good synchronization; the servo drive structures on both sides are independent, and the manufacturing errors of the structures on both sides can be easily compensated by servo drive control, thereby reducing the processing requirements of the transmission parts on both sides, and the high-precision parallel movement of the slider is guaranteed by closed-loop servo drive control, and the servo drive can easily realize process curve control such as displacement-speed and displacement-driving torque.

[0005] The technical solution for achieving the purpose of the present invention is: a distributed servo press main transmission structure, a large four-point servo press distributed main transmission mechanism, and the servo drive components are axially symmetrically distributed; each group of servo drive components includes a transmission component and one or more servo motors, and the two points on the same side are driven by two connecting rods driven by the same eccentric gear; the servo motor is installed on the cross beam of the fuselage, and the movement of the transmission component is controlled and driven by the servo motor, thereby controlling and driving the slider located at the end of the transmission component to move up and down in parallel.

[0006] Compared with the prior art, the present invention has the following significant advantages:

[0007] (1) The present invention provides two independent distributed servo drive components, so that the torque of the drive components on both sides can be independently configured as needed, thereby enhancing the anti-eccentric load capability and reducing energy consumption, which is particularly beneficial for large multi-station servo presses;

[0008] (2) The two independent servo drive components of the present invention can conveniently compensate for the manufacturing errors of the structures on both sides through servo drive control, thereby reducing the machining accuracy requirements of the transmission parts on both sides; and simplifying the overall transmission structure of the large press.

[0009] (3) In the present invention, the two-point drive in the servo drive assembly on the same side is driven by the same eccentric gear, which simplifies the structure and ensures the synchronization of the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a front view of an example of the present invention;

[0011] Figure 2 This is a diagram of the composition of the servo drive components of an example of the present invention. DETAILED DESCRIPTION

[0012] The terms used in the present invention are only for the purpose of illustrating the embodiments of the present invention and are not intended to limit the present invention. Figure 1 and Figure 2 , some embodiments of the present invention are described in detail.

[0013] The present invention discloses a distributed main transmission mechanism for a servo press, comprising a body crossbeam 1, two groups of axisymmetrically distributed servo drive components 2 and a slide block 3.

[0014] like Figure 1 Each servo drive assembly 2 includes: a transmission assembly, a servo motor 2-2 and a brake 2-3.

[0015] The transmission assembly includes: a drive input gear assembly, an eccentric wheel assembly and a connecting member 2-12;

[0016] The input gear assembly includes: a first gear 2-1, a first shaft 2-4, a third gear 2-5, and a second gear 2-6;

[0017] The eccentric wheel assembly includes: a second shaft 2-7, an eccentric gear 2-8 and a connecting rod 2-9.

[0018] Two servo motors 2-2 are installed on the fuselage cross beam 1. The output shafts of the servo motors 2-2 are connected to the two first gears 2-1. The first gear 2-1 is meshed with the third gear (large gear) 2-5. The first shaft 2-4 is rotatably connected to the fuselage cross beam 1. The third gear (large gear) 2-5 is coaxially fixedly connected to the first shaft 2-4. The second gear 2-6 is coaxially fixedly connected to the first shaft 2-4. The second gear 2-6 is meshed with the eccentric gear 2-8. The second shaft 2-7 is rotatably connected to the fuselage cross beam 1. The eccentric gear 2-8 is fixedly connected to the second shaft 2-7. The connecting rod 2-9 is arranged on both sides of the eccentric gear 2-8, and the upper part is fixedly connected to the eccentric gear 2-8. The lower part of the connecting rod 2-9 is rotatably connected to the connecting member 2-11 through the pin 2-10; the bottom of the connecting member 2-11 is fixedly connected to the slider 3. The eccentric journals on both sides of the eccentric gear 2-8 drive two connecting rods 2-9, and the connecting rods 2-9 drive the slider 3 to move through the connecting piece 2-11, thereby realizing the two-point drive of the slider 3 of the two-point drive press on the same side.

[0019] The brake 2-3 is arranged at the shaft end of the first shaft 2-4, and the brake 2-3 body is fixedly mounted on the fuselage cross beam 1, so as to realize emergency braking in case of emergency to ensure the safety of the press operation.

[0020] The working process of the main transmission structure of the distributed servo press is as follows: the four servo motors 2-2 installed on the fuselage cross beam 1 drive the first gear 2-1 to rotate, and then drive the third gear 2-5 on the first shaft 2-4 to rotate, and then the second gear 2-6 on the first shaft 2-4 drives the eccentric gear 2-8 on the second shaft 2-7 to rotate, and then the eccentric gear 2-8 is connected to the connecting piece 2-11 on the slider 3 through two connecting rods 2-9 and pins 2-10, and the slider 3 of the four-point drive press is moved on both sides at the same time; the brake 2-3 configured at the shaft end of the first shaft 2-4 realizes emergency braking in an emergency to ensure the safety of the press operation. Through the precise synchronous control of the closed-loop servo on both sides, the high-precision parallel movement of the slider is realized, and the process curve control such as displacement-speed and displacement-driving torque can be easily realized.

[0021] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A distributed main transmission mechanism for a large four-point servo press, characterized in that: The servo drive components (2) are arranged in an axisymmetric distribution; each group of servo drive components (2) comprises a transmission component and a servo motor (2-2); the servo motor (2-2) is mounted on the fuselage cross beam (1), and the servo motor (2-2) controls and drives the movement of the transmission component, thereby controlling and driving the slider (3) located at the end of the transmission component to move in an upper and lower plane.

2. The distributed main transmission mechanism of the large four-point servo press according to claim 1 is characterized in that: The transmission assembly in each group of servo drive assemblies (2) comprises an input gear assembly, an eccentric wheel assembly and a connecting piece (2-11); the servo motor (2-2) drives the input gear assembly to move, and then the input gear assembly drives the eccentric wheel assembly to rotate eccentrically; the eccentric wheel assembly is hinged to the upper part of the connecting piece (2-11), and the lower part of the connecting piece (2-11) is fixed on the slider (3).

3. The distributed main transmission mechanism of the large four-point servo press according to claim 2 is characterized in that: The input gear assembly comprises a first gear (2-1), a first shaft (2-4), a third gear (2-5), and a second gear 2-6; the output shaft of the servo motor (2-2) is connected to the two first gears (2-1), the first gear (2-1) is meshed with the third gear (2-5), the first shaft (2-4) is rotationally connected to the fuselage cross beam 1, the third gear (2-5) is coaxially fixedly connected to the first shaft (2-4), and the second gear (2-6) is coaxially fixedly connected to the first shaft (2-4).

4. The distributed main transmission mechanism of the large four-point servo press according to claim 3 is characterized in that: The eccentric wheel assembly comprises a second shaft (2-7), an eccentric gear (2-8) and a connecting rod (2-9); the second shaft (2-7) is rotatably connected to the fuselage cross beam (1), the eccentric gear (2-8) is fixedly connected to the second shaft (2-7), and the second gear (2-6) is meshed with the eccentric gear (2-8); the connecting rod (2-9) is arranged on both sides of the eccentric gear (2-8), and the upper part of the connecting rod (2-9) is fixedly connected to the eccentric gear (2-8); the lower part of the connecting rod (2-9) is rotatably connected to the connecting member (2-11) through a pin (2-10); the bottom of the connecting member (2-11) is fixedly connected to the slider (3); the eccentric gear (2-8) rotates eccentrically around the second shaft (2-7), thereby driving the connecting rod (2-9) to move up and down; thereby realizing the up and down movement of the slider (3).

5. The distributed main transmission mechanism of the large four-point servo press according to claim 2 is characterized in that: Each group of servo drive components (2) also includes a brake (2-3), which is arranged at the shaft end of the first shaft (2-4). The brake (2-3) is fixedly mounted on the fuselage cross beam (1) and is used to implement emergency braking in an emergency.

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