Multi-power unit and its coordinated control system for large-tonnage servo press

Abstract

The application discloses a large-tonnage servo press multiple power unit and a collaborative control system thereof, and relates to the technical field of servo presses.The large-tonnage servo press multiple power unit and the collaborative control system thereof comprise a bearing bottom plate, a total control box for controlling the whole device and a mounting support frame for supporting the whole device are mounted on the upper surface of the bearing bottom plate, and a top frame is fixedly mounted at the top end of the mounting support frame; and two symmetrical power units are arranged.The mounting support frame with an H-shaped steel frame structure is matched with shock-absorbing rubber pads, so that the vibration of the equipment during operation is effectively reduced, and the overall rigidity is improved; the collaborative layout of the bearing bottom plate and the top frame ensures that the load is uniformly distributed and adapts to large-tonnage impact working conditions; the meshing transmission of the driving gear and the driven inner gear ring of the double servo motors is matched with a servo driver and an absolute encoder, so that the precise synchronization of two shafts is realized; and the cooperation design of the inner six-rib sleeve and the limiting cylinder ensures that the pressure slide column does not deviate during upward and downward sliding.

Description

Technical Field

[0001] This invention relates to the field of servo press technology, and more particularly to a multi-power unit and its coordinated control system for a large-tonnage servo press. Background Technology

[0002] Servo presses generally refer to presses driven and controlled by servo motors. This includes servo presses for metal forging and specialized servo presses for industries such as refractory materials. Due to the numerical control characteristics of servo motors, they are sometimes also widely referred to as CNC presses. Their core feature is the synchronous control of multiple power units, coordinating the actions of each unit through a closed-loop system (such as a PLC or motion controller) to ensure load balance and motion consistency.

[0003] Most existing large-tonnage servo presses use gear transmission to drive the crank-connecting rod structure to control the slide to slide up and down. Mechanical transmission clearance (such as gear backlash) can easily cause phase difference, which requires regular calibration. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and propose a multi-power unit and its collaborative control system for a large-tonnage servo press.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: The high-tonnage servo press has multiple power units, including: The base plate 1 has a main control box 2 for controlling the overall device and a mounting support frame 4 for supporting the overall device installed on its upper surface. A top frame 5 is fixedly installed at the top of the mounting support frame 4. At least two symmetrically arranged power units are configured with a connecting turntable 15 as their main body. A rotating mounting ring 8 is integrally formed on one side of the connecting turntable 15, and a driven internal gear ring 9 is fixedly installed on one side of the inner wall of the rotating mounting ring 8. Servo motors 11 are provided at both ends of the top of the top frame 5. A drive gear 12 is fixedly installed at the end of the output shaft of the servo motor 11, and the drive gear 12 meshes with the inner wall of the driven internal gear ring 9. A drive convex arm 16 is integrally formed on the side wall of the connecting turntable 15. A rotating pin 17 is fixedly connected to the end of the drive convex arm 16. A drive connecting rod 18 is rotatably installed on the outer wall of the rotating pin 17, and a rotating connecting shaft 19 is rotatably installed at the bottom end between the two drive connecting rods 18. The pressure slide column 21 is provided in at least two parts, and a rotating connecting seat 20 is welded to the top of each part. The two rotating connecting seats 20 are respectively rotatably installed at both ends of the rotating connecting shaft 19. The outer wall of the pressure slide column 21 is fitted with an internal hexagonal sleeve 23.

[0006] As a preferred embodiment of the present invention: a multi-faceted insert 30 is fixedly inserted into the bottom end of the pressure slide 21, and a limiting sleeve 31 is fixedly sleeved on the bottom of the outer wall of the pressure slide 21. The bottom ends of the multi-faceted insert 30 and the limiting sleeve 31 are integrally formed with mounting circular plates 32. Mounting lifting platforms 33 are fixedly installed at the bottom ends of the two mounting circular plates 32. End connecting frames 34 are fixedly installed on both sides of the mounting lifting platforms 33, and mounting bases 35 are welded to both ends of one side of the end connecting frames 34.

[0007] Based on the aforementioned scheme: a guide slide column 36 is fixedly installed inside the mounting base 35, and multiple limiting guide sleeves 37 are equidistantly arranged on the lower part of the outer wall of the guide slide column 36. A high-precision linear bearing 38 is fixedly installed inside the limiting guide sleeve 37, and the high-precision linear bearing 38 is slidably sleeved on the outer wall of the guide slide column 36.

[0008] Based on the aforementioned scheme: a mounting arm 39 is fixedly connected to one side of the limiting guide sleeve 37, a positioning connection box 14 is fixedly installed between multiple mounting arms 39, and mounting side frames 13 are fixedly installed on both sides of the positioning connection box 14, and the mounting side frames 13 are fixedly connected to the mounting support frame 4.

[0009] As a preferred embodiment of the present invention: a sleeve connecting bracket 28 is provided between the two inner hexagonal sleeves 23, and a bracket engaging bracket 29 is fixedly installed at both ends of the sleeve connecting bracket 28. The bracket engaging bracket 29 is fixedly connected to the side wall of the positioning connecting box 14. Multiple mounting back brackets 22 are fixedly installed at equal intervals on the back of the positioning connecting box 14, and the mounting back brackets 22 are fixedly connected to the mounting support frame 4.

[0010] As a preferred embodiment of the present invention: the inner wall of the hexagonal sleeve 23 is provided with a plurality of mounting grooves 24 at equal intervals, and a plurality of limiting bearing shafts 25 are rotatably mounted at equal intervals inside the mounting grooves 24. The outer wall of the limiting bearing shafts 25 is rotatably sleeved with a limiting roller 26; the outer wall of the pressure slide 21 is provided with a plurality of planes parallel to the axis at equal intervals, the plurality of planes corresponding to the plurality of mounting grooves 24 and fitting against the outer wall of the limiting roller 26.

[0011] As a preferred embodiment of the present invention: a roller bearing 7 is fixedly sleeved on the outer wall of the rotating mounting ring 8, and a rotating support frame 6 is fixedly installed on the outer wall of the outer ring of the roller bearing 7, and the rotating support frame 6 is fixedly installed on the top of the top frame 5; a motor mounting base 10 is fixedly installed on the bottom of the servo motor 11, and the motor mounting base 10 is fixedly installed on the top of the top frame 5.

[0012] The collaborative control system of multiple power units for a large-tonnage servo press includes: an industrial computer, a servo driver, an absolute encoder, 42 displacement sensors, and a pressure sensor; the industrial computer is equipped with an x86 architecture processor and supports real-time control via EtherCAT bus; the servo driver adopts a cross-coupling compensation algorithm and has a built-in temperature compensation module.

[0013] As a preferred embodiment of the present invention, the displacement sensor 42 is disposed at the top of the guide slide column 36 of the multi-power unit of the large-tonnage servo press, and measures the descent distance of the top of the guide slide column 36 in real time, and feeds back the measurement data to the industrial computer.

[0014] As a preferred embodiment of the present invention: the pressure sensor is installed at the bottom of the mounting lifting platform 33 of the multi-power unit of the large-tonnage servo press, and is set as a piezoelectric quartz sensor with a range of 0-5000kN and a linearity error of <0.1%FS.

[0015] The beneficial effects of this invention are as follows: This application uses an H-shaped steel frame structure for the installation support frame, combined with shock-absorbing rubber pads, to effectively reduce equipment operating vibration and improve overall rigidity; the coordinated layout of the load-bearing base plate and the top frame ensures uniform load distribution and adapts to heavy-tonnage impact conditions; dual servo motors achieve precise synchronization of the two axes through the meshing of the drive gear and the driven internal gear ring, in conjunction with a servo driver and an absolute encoder; the design of the internal hexagonal sleeve and the limiting roller ensures that the pressure slide column slides up and down without deviation.

[0016] Real-time data feedback from displacement and pressure sensors enables multi-axis collaborative control via EtherCAT bus, supporting online quality assessment and process parameter optimization. Servo motors directly drive eccentric gear shafts, combined with cross-coupling compensation algorithms, resulting in 80% energy savings compared to traditional hydraulic systems. Renishaw RGH22 absolute encoders are used to achieve closed-loop position control with a repeatability accuracy of ±0.001°. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the overall assembly of the present invention.

[0018] Figure 2 This is a partial cross-sectional view of the overall assembly of the present invention.

[0019] Figure 3 For the present invention Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0020] Figure 4 For the present invention Figure 2 A magnified schematic diagram of the structure at point B in the middle.

[0021] Figure 5 For the present invention Figure 2 A magnified schematic diagram of the structure at point C.

[0022] Figure 6 For the present invention Figure 2 A magnified schematic diagram of the structure at point D.

[0023] In the diagram: 1. Bearing base plate; 2. Main control box; 3. Pressure bearing platform; 4. Mounting support frame; 5. Top frame; 6. Rotating bearing frame; 7. Roller bearing; 8. Rotating mounting ring; 9. Driven internal gear ring; 10. Motor mounting base; 11. Servo motor; 12. Drive gear; 13. Mounting side frame; 14. Positioning connection box; 15. Connecting turntable; 16. Drive convex arm; 17. Rotating pin; 18. Drive connecting rod; 19. Rotating connecting shaft; 20. Rotating connecting seat; 21. Pressure slide; 22. Mounting back. 23. Frame; 24. Hexagonal sleeve; 25. Mounting slide; 26. Limiting bearing shaft; 27. Limiting roller; 28. End mounting block; 29. ​​Sleeve connecting bracket; 30. Bracket and clamp; 31. Multi-faceted insert; 32. Limiting sleeve; 33. Mounting round plate; 34. Mounting lifting platform; 35. End connecting frame; 36. Mounting base; 37. Guide slide; 38. Limiting guide sleeve; 39. High-precision linear bearing; 40. Mounting boom; 41. Top mounting boom; 42. Positioning mounting cylinder; 43. Displacement sensor. Detailed Implementation

[0024] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0025] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0026] Large-tonnage servo presses with multiple power units and their coordinated control systems, such as Figures 1 to 6 As shown, it includes: a support frame structure, two symmetrically arranged power units, and a collaborative control system for controlling the overall device.

[0027] The support frame structure of the multi-power unit of the large-tonnage servo press includes a bearing base plate 1 and a mounting support frame 4. The mounting support frame 4, which supports the overall device, is fixedly installed on the upper surface of the bearing base plate 1. A main control box 2 for controlling the overall device is fixedly installed in the middle of the upper surface of the bearing base plate 1. A pressure bearing platform 3 is fixedly installed at the top of the main control box 2. A workpiece forming die is fixedly installed on the upper surface of the pressure bearing platform 3. A top frame 5 is fixedly installed at the top of the mounting support frame 4.

[0028] The main control box 2 is equipped with an IP65 protection rating and a built-in overload protection module (response time less than 5ms); the mounting support frame 4 adopts an H-shaped steel frame structure and integrates a shock-absorbing rubber pad (15mm thick) on the top.

[0029] The main body of the power unit is a connecting turntable 15. A rotating mounting ring 8 is integrally formed on one side of the connecting turntable 15. A roller bearing 7 is fixedly sleeved on the outer wall of the rotating mounting ring 8. A rotating bearing frame 6 is fixedly installed on the outer wall of the outer ring of the roller bearing 7. The rotating bearing frame 6 is fixedly installed on the top of the top frame 5. The connecting turntable 15 is forged from 45# steel and has a surface carburizing treatment (hardness HRC58-62).

[0030] An adapter ring groove is provided on the inner wall of the rotating mounting ring 8 away from the connecting turntable 15. A driven internal gear ring 9 is fixedly installed inside the adapter groove. Multiple threaded pins are welded at equal intervals on the side wall of the adapter ring groove. The threaded pins pass through the driven internal gear ring 9 and are fixed by nuts. The driven internal gear ring 9 is made of 20CrMnTi alloy steel and the tooth surface is high frequency quenched.

[0031] Servo motors 11 are provided at both ends of the top of the top frame 5. A drive gear 12 is fixedly installed at the output shaft end of the servo motor 11, and the drive gear 12 meshes with the inner wall of the driven internal gear ring 9. A motor mounting base 10 is fixedly installed at the bottom end of the servo motor 11, and the motor mounting base 10 is fixedly installed at the top of the top frame 5.

[0032] The side wall of the connecting turntable 15 is integrally formed with a drive convex arm 16. The end of the drive convex arm 16 is fixedly connected to a rotating pin 17 on the side away from the rotating mounting ring 8. The outer wall of the rotating pin 17 is rotatably mounted with a drive connecting rod 18 through a bearing. The drive connecting rod 18 adopts a hollow rectangular tube structure to reduce weight. A rotating connecting shaft 19 is rotatably mounted at the bottom end between the two drive connecting rods 18.

[0033] Rotary connecting shaft 19 has rotating connecting seats 20 mounted on both ends. A pressure slide 21 is welded to the bottom of the rotating connecting seat 20. An inner hexagonal sleeve 23 is sleeved on the outer wall of the pressure slide 21. Three mounting grooves 24 are equidistantly opened on the inner wall of the inner hexagonal sleeve 23. Multiple limiting bearing shafts 25 are rotatably mounted equidistantly inside the mounting grooves 24. A limiting roller 26 is rotatably sleeved on the outer wall of the limiting bearing shaft 25.

[0034] The inner cavity of the internal hexagonal sleeve 23 is configured as a regular hexagonal prism groove. Three mounting grooves 24 are equidistantly opened on the side wall of the regular hexagonal prism groove. Both ends of the limiting bearing shaft 25 penetrate the cylinder of the internal hexagonal sleeve 23 and extend outward. Its extended end is rotatably sleeved with an end mounting block 27, which is welded to the outer wall of the internal hexagonal sleeve 23.

[0035] Three planes parallel to the axis are arranged at equal intervals on the outer wall of the pressure sliding column 21, the plurality of planes correspond to the plurality of mounting chutes 24 and fit with the outer wall of the limiting roller 26, which fully ensures that the pressure sliding column 21 can slide up and down stably without deviation.

[0036] A sleeve connecting clamp frame 28 is arranged between the two inner hexagonal prismatic sleeves 23, clamp frame matching hoop frames 29 are fixedly installed at both ends of the sleeve connecting clamp frame 28, and a positioning connection box 14 is fixedly installed on one side of the clamp frame matching hoop frame 29.

[0037] The sleeve connecting clamp frame 28 comprises an upper part and a lower part with the same structure and size, the upper part is composed of two semicircular clamp rings and a cross arm welded between the two clamp rings, and a vertical rod is welded between the cross arms of the upper part and the lower part, so that the upper part and the lower part are relatively fixed; and a convex platform is integrally formed on the inner wall of the clamp ring, and a corresponding groove is formed on the outer wall of the inner hexagonal prismatic sleeve 23.

[0038] The main body of the clamp frame matching hoop frame 29 is provided with an upper semicircular hoop ring and a lower semicircular hoop ring, a convex platform is integrally formed on the inner wall of the hoop ring, the convex platform is clamped inside the groove, and both ends of the hoop ring and both ends of the clamp ring are fixedly connected through bolts to lock and fix the inner hexagonal prismatic sleeve 23; a connecting vertical rod is welded between the two hoop rings, a -shaped fixing arm is integrally formed at both ends of the connecting vertical rod, and the fixing arm is fixedly connected with the side wall of the positioning connection box 14.

[0039] Mounting side frames 13 are fixedly installed on both sides of the positioning connection box 14, and a plurality of mounting back frames 22 are fixedly installed on the back surface of the positioning connection box 14 at equal intervals, and both the mounting side frames 13 and the mounting back frames 22 are fixedly connected with the mounting support frame 4.

[0040] A multi-edge inserting column 30 is fixedly inserted at the bottom end of the pressure sliding column 21, a limiting sleeve 31 is fixedly sleeved on the bottom of the outer wall of the pressure sliding column 21 through a fixing bolt, and the fixing bolt runs through the multi-edge inserting column 30 and the pressure sliding column 21; and a mounting circular plate 32 is integrally formed at the bottom ends of the multi-edge inserting column 30 and the limiting sleeve 31.

[0041] A mounting lifting table 33 is fixedly installed at the bottom ends of the two mounting circular plates 32, a convex mold for workpiece forming is fixedly installed at the bottom end of the mounting lifting table 33, end connection frames 34 are fixedly installed on both sides of the mounting lifting table 33 through a plurality of bolts, and mounting bases 35 are welded at both ends of the side of the end connection frame 34 away from the mounting lifting table 33.

[0042] Inside the mounting base 35, a guide slide column 36 is fixedly installed by bolts. Two limiting guide sleeves 37 are equidistantly arranged on the lower part of the outer wall of the guide slide column 36. A high-precision linear bearing 38 is fixedly installed inside the limiting guide sleeve 37 and slides on the outer wall of the guide slide column 36. A mounting arm 39 is fixedly connected to one side of the limiting guide sleeve 37. The two mounting arms 39 are fixedly installed on the top and bottom of the side wall of the positioning connection box 14, respectively.

[0043] In this embodiment, when in use, two servo motors 11 are started, and through the meshing of the drive gear 12 and the driven internal gear ring 9, the rotating mounting ring 8 is driven to rotate clockwise. The rotating mounting ring 8 drives the top of the drive connecting rod 18 to move synchronously through the drive convex arm 16 and the rotating pin 17. The bottom end of the drive connecting rod 18 drives the two pressure sliding columns 21 to slide synchronously up and down through the rotating connecting seat 20 and the rotating connecting shaft 19. Under the cooperation of the internal hexagonal sleeve 23 and the limiting roller 26, the two pressure sliding columns 21 slide stably up and down without positional deviation. The mounting circular plate 32 drives the mounting lifting platform 33 to move synchronously and stably up and down. During the up and down movement of the mounting lifting platform 33, the guide sliding column 36 moves synchronously. Under the action of the high-precision linear bearing 38 and the limiting guide sleeve 37, the stability of the up and down movement of the mounting lifting platform 33 is further improved.

[0044] The collaborative control system of the multi-power unit of the large-tonnage servo press includes an industrial computer, servo driver, absolute encoder, displacement sensor 42, and pressure sensor located inside the main control box 2, and is equipped with a control panel for controlling the overall device; the industrial computer is equipped with an X86 architecture processor and supports real-time control via EtherCAT bus.

[0045] A top mounting arm 40 is fixedly installed at the top of the guide slide column 36. A positioning mounting cylinder 41 is fixedly connected to one end of the top mounting arm 40. A displacement sensor 42 is fixedly installed inside the positioning mounting cylinder 41 and is located directly above the mounting arm 39. The displacement sensor 42 is used to calculate the displacement of the guide slide column 36. The displacement sensor 42 measures the descent distance of the top of the guide slide column 36 in real time and feeds the measurement data back to the industrial computer. The industrial computer adjusts the output speed of the two servo motors 11, and then adjusts the deflection position of the drive arm 16 to adjust the height of the pressure slide column 21, so as to achieve the purpose of balanced force on the mounting lifting platform 33 and maintain the stable displacement of the mounting lifting platform 33.

[0046] The servo drive works in conjunction with the absolute encoder to control the servo motor 11. The industrial computer directly sends commands to the servo drive. After receiving the commands, the servo drive drives the servo motor 11 to operate according to its internal algorithm, and collects the output speed feedback signal in real time through the absolute encoder connected to the servo motor 11. The servo drive adopts a cross-coupling compensation algorithm to achieve a speed difference of less than 0.5% between the two axes. It has a built-in temperature compensation module (PT100 sensor) with a temperature drift coefficient of less than 0.02% / ℃. The absolute encoder is set to Renishaw RGH22 type with a resolution of 4096PPR and a repeatability accuracy of ±0.001°. The pressure sensor is installed at the bottom of the mounting platform 33. It is a piezoelectric quartz sensor with a range of 0-5000kN and a linearity error of <0.1%FS. It is used to calculate the specific pressure applied and feeds back the calculated pressure value to the industrial computer in real time. The industrial computer adjusts the output speed of the servo motor 11, thereby adjusting the pressure released by the mounting platform 33.

[0047] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multi-power unit for a large-tonnage servo press, characterized in that: include: The base plate (1) is supported by a main control box (2) for controlling the overall device and a mounting support frame (4) for supporting the overall device. A top frame (5) is fixedly installed at the top of the mounting support frame (4). At least two symmetrically arranged power units are configured with a connecting turntable (15) as their main body. A rotating mounting ring (8) is integrally formed on one side of the connecting turntable (15), and a driven internal gear ring (9) is fixedly installed on one side of the inner wall of the rotating mounting ring (8). Servo motors (11) are provided at both ends of the top of the top frame (5). A drive gear (12) is fixedly installed at the end of the output shaft of the servo motor (11), and the drive gear (12) meshes with the inner wall of the driven internal gear ring (9). A drive convex arm (16) is integrally formed on the side wall of the connecting turntable (15). A rotating pin (17) is fixedly connected to the end of the drive convex arm (16). A drive connecting rod (18) is rotatably installed on the outer wall of the rotating pin (17), and a rotating connecting shaft (19) is rotatably installed at the bottom end between the two drive connecting rods (18). Pressure slides (21) are provided in at least two, and a rotating connecting seat (20) is welded to the top of each slide. The two rotating connecting seats (20) are respectively rotatably installed at both ends of the rotating connecting shaft (19). The outer wall of the pressure slide (21) is fitted with an inner hexagonal sleeve (23). A sleeve connecting bracket (28) is provided between the two internal hexagonal sleeves (23). Both ends of the sleeve connecting bracket (28) are fixedly installed with bracket fitting brackets (29). The bracket fitting brackets (29) are fixedly connected to the side wall of the positioning connecting box (14). Multiple mounting back brackets (22) are fixedly installed at equal intervals on the back of the positioning connecting box (14). The mounting back brackets (22) are fixedly connected to the mounting support frame (4). The inner wall of the inner hexagonal sleeve (23) is provided with multiple mounting grooves (24) at equal intervals. Multiple limiting bearing shafts (25) are rotatably mounted inside the mounting grooves (24) at equal intervals. The outer wall of the limiting bearing shafts (25) is rotatably sleeved with a limiting roller (26). The outer wall of the pressure slide (21) is provided with multiple planes parallel to the axis at equal intervals. The multiple planes correspond to the multiple mounting grooves (24) and fit against the outer wall of the limiting roller (26).

2. The multi-power unit of the large-tonnage servo press according to claim 1, characterized in that: The bottom end of the pressure slide (21) is fixedly inserted with a multi-faceted insert (30), and the bottom of the outer wall of the pressure slide (21) is fixedly sleeved with a limiting sleeve (31). The bottom ends of the multi-faceted insert (30) and the limiting sleeve (31) are integrally formed with mounting round plates (32). The bottom ends of the two mounting round plates (32) are fixedly installed with mounting lifting platforms (33). The two sides of the mounting lifting platforms (33) are fixedly installed with end connecting frames (34). The two ends of one side of the end connecting frames (34) are welded with mounting bases (35).

3. The multi-power unit of the large-tonnage servo press according to claim 2, characterized in that: The mounting base (35) is fixedly installed with a guide slide column (36). Multiple limiting guide sleeves (37) are equidistantly arranged on the lower part of the outer wall of the guide slide column (36). A high-precision linear bearing (38) is fixedly installed inside the limiting guide sleeve (37). The high-precision linear bearing (38) is slidably sleeved on the outer wall of the guide slide column (36).

4. The multi-power unit of the large-tonnage servo press according to claim 3, characterized in that: One side of the limiting guide sleeve (37) is fixedly connected to an installation arm (39), and a positioning connection box (14) is fixedly installed between multiple installation arms (39). Both sides of the positioning connection box (14) are fixedly installed with installation side frames (13), and the installation side frames (13) are fixedly connected to the installation support frame (4).

5. The multi-power unit for a large-tonnage servo press according to claim 1, characterized in that: The outer wall of the rotating mounting ring (8) is fixedly fitted with a roller bearing (7), and the outer wall of the outer ring of the roller bearing (7) is fixedly fitted with a rotating support frame (6), which is fixedly installed at the top of the top frame (5); the bottom end of the servo motor (11) is fixedly fitted with a motor mounting base (10), which is fixedly installed at the top of the top frame (5).

6. A coordinated control system for multiple power units of a large-tonnage servo press, used to control the multiple power units of the large-tonnage servo press as described in any one of claims 1-5, characterized in that, include: Industrial computer, servo drive, absolute encoder, displacement sensor (42), pressure sensor; the industrial computer is equipped with an X86 architecture processor and supports real-time control via EtherCAT bus; the servo drive adopts a cross-coupling compensation algorithm and has a built-in temperature compensation module. The absolute encoder is connected to the servo motor (11); the displacement sensor (42) is set at the top of the guide column (36) of the multi-power unit of the large-tonnage servo press, and measures the descent distance of the top of the guide column (36) in real time and feeds the measurement data back to the industrial computer; the pressure sensor is installed at the bottom of the mounting lifting platform (33) of the multi-power unit of the large-tonnage servo press, and is set as a piezoelectric quartz sensor with a range of 0 to 5000kN and a linearity error of less than 0.1%FS.

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