Multi-rod symmetrical transmission mechanism of press machine and press machine

Abstract

The invention discloses a press machine multi-rod symmetrical transmission mechanism and a press machine, and belongs to the technical field of plastic processing press machines. Comprising a supporting shaft, a multi-rod assembly and a driving assembly. A large gear is rotationally arranged on the supporting shaft. The multi-rod assembly comprises a cross rod axially and eccentrically arranged on the large gear, the cross rod is rotationally connected with a first connecting rod, the first connecting rod is rotationally connected with a crank, the crank is fixedly connected with a crankshaft, the crankshaft is rotationally arranged on the supporting shaft and provided with a connecting rod journal, and the connecting rod journal and the crank are located on the two sides of the supporting shaft respectively. A second connecting rod is rotationally connected to the connecting rod journal and rotationally connected with the press sliding block, and the axis of the large gear and the axis of the crankshaft are arranged in a relatively eccentric mode. The driving assembly drives the large gear to rotate and drives the eccentrically-arranged cross rod to move, the cross rod drives the crankshaft to rotate through the first connecting rod and the crank, the connecting rod journal on the crankshaft rotates around the axis of the crankshaft and drives the second connecting rod to move, and the second connecting rod finally drives the press sliding block to move up and down.

Description

Technical Field

[0001] This application relates to the technical field of plastic processing presses, and particularly to a multi-rod symmetric transmission mechanism for a press and a press. Background Art

[0002] With the continuous progress of digital heavy-duty drive technology and the increasing demand for process flexibility and green intelligent manufacturing in the plastic processing field, replacing traditional presses with servo presses has become an important development direction in the modern plastic processing field. Servo presses achieve diverse slider movements through precise control of speed, position, and torque by servo motors, bringing many advantages to plastic processing, such as improving processing accuracy, extending die life, promoting digital and automated production, and achieving energy conservation and emission reduction.

[0003] However, the servo press field also faces some challenges and problems during development. Firstly, the transmission mechanisms of existing servo presses are unreasonable, resulting in excessive motor power and high costs. And the slider movement curve is not ideal. In addition, since servo presses need to withstand large impact forces and vibrations during processing, there are high requirements for their overall stiffness. However, in actual applications, due to design or manufacturing reasons, the overall stiffness of some servo presses may be poor, thus affecting the processing accuracy and service life of the equipment. Summary of the Invention

[0004] The purpose of this application is to provide a multi-rod symmetric transmission mechanism for a press and a press, which are used to solve the problems in the prior art that the slider movement curve of the press transmission is not ideal, the force transmission of the mechanism is unbalanced, and the overall stiffness is poor.

[0005] To solve the above technical problems, the following technical solutions are adopted in this application:

[0006] On the one hand, this application provides a multi-rod symmetric transmission mechanism for a press, including: a support shaft, on which a large gear is rotatably arranged;

[0007] A multi-rod assembly, including a cross bar axially eccentrically arranged on the large gear, a first connecting rod rotatably connected to the cross bar, a crank rotatably connected to the first connecting rod, a crankshaft fixedly connected to the crank, the crankshaft being rotatably arranged on the support shaft, the crankshaft having a connecting rod journal, the connecting rod journal and the crank being located on both sides of the support shaft respectively, a second connecting rod rotatably connected to the connecting rod journal, the second connecting rod being rotatably connected to the press slider, and the axis of the large gear and the axis of the crankshaft being relatively eccentrically arranged.

[0008] A driving assembly for driving the large gear to rotate.

[0009] In this solution, a driving component drives a large gear to rotate. The rotation of the large gear drives a horizontally-bar arranged eccentrically to move. The horizontally-bar drives a crankshaft to rotate through a first connecting rod and a crank. The connecting rod journal on the crankshaft rotates around the axis of the crankshaft, driving the second connecting rod to move. The second connecting rod finally drives the slider of the press to move up and down. This solution has a compact structure, can effectively convert rotational motion into linear motion, achieve an ideal slider motion curve, and at the same time, the force transmission of the entire mechanism is more balanced, the overall stiffness is high, the motion is more stable, and the strength of the components is better. By adjusting the parameters of each component, various different slider motion curves can be achieved, and it can be applied to presses with high precision and high efficiency.

[0010] Optionally, the large gear includes a first large gear and a second large gear arranged coaxially, and the horizontally-bar is arranged between the first large gear and the second large gear.

[0011] Through the arrangement of the first large gear and the second large gear, the horizontally-bar receives driving forces from two gears, making the motion more stable. And the two coaxially arranged gears can provide a more stable support structure, thereby increasing the stiffness of the entire transmission mechanism. This helps to maintain the stability and accuracy of the mechanism, especially when bearing heavy loads or moving at high speeds.

[0012] Optionally, the support shaft includes a first support shaft and a second support shaft. A first shaft-end baffle for fixing the first large gear is provided on the first support shaft, and a second shaft-end baffle for fixing the second large gear is provided on the second support shaft. The connecting rod journal and the crank are respectively located on both sides of the first support shaft.

[0013] The first support shaft and the second support shaft can provide more stable support for the first large gear and the second large gear. This helps to reduce vibrations and noises caused by unstable support and improve the running smoothness of the mechanism.

[0014] The arrangement of the first shaft-end baffle and the second shaft-end baffle ensures the axial fixation of the first large gear and the second large gear, preventing axial movement during operation. This helps to maintain the meshing accuracy and transmission efficiency of the gears and improve the reliability of the mechanism.

[0015] Optionally, the end of the crankshaft on one side of the connecting rod journal is rotatably connected to the press body.

[0016] In this solution, the crankshaft is fixed to the machine tool through the first support shaft on both sides of the connecting rod journal, enhancing the stability of the entire transmission mechanism.

[0017] Optionally, the connecting rod is rotatably connected to the middle of the horizontally-bar.

[0018] The horizontally-bar can receive driving forces from two gears more evenly, making the force transmission more balanced;

[0019] Optionally, the driving member includes a motor, a coupling, and a pinion gear, the pinion gear meshes with the large gear, and the output end of the motor is connected to the pinion gear through the coupling.

[0020] As a power source, the motor can provide stable and controllable rotational motion. Connecting the output end of the motor to the pinion gear through the coupling can ensure smooth power transmission, reducing vibration and shock. The meshing transmission between the pinion gear and the large gear is efficient and reliable. Gear transmission can transmit a large torque while maintaining high transmission accuracy. This helps to ensure the stability and durability of the transmission mechanism. At the same time, it also reduces the motor power requirement.

[0021] Optionally, the crank is fixedly connected to the crankshaft by a key.

[0022] Using a key (such as a flat key, spline key, etc.) to fixedly connect the crank to the crankshaft has the advantages of simple structure, easy manufacturing and installation, etc. Through the torque transmission function of the key, the relative position between the crank and the crankshaft can be ensured to be stable.

[0023] Optionally, the crank and the crankshaft have multiple fixed angles.

[0024] By adjusting the fixed angle between the crank and the crankshaft, the motion curve of the slider can be flexibly changed, meeting different working conditions and load requirements.

[0025] On the other hand, the present application provides a press, including the multi-link symmetric transmission mechanism of the press.

[0026] Compared with the prior art, the beneficial effects achieved by the present application are as follows: In the present invention, the driving assembly drives the large gear to rotate, the rotation of the large gear drives the eccentrically arranged cross bar to move, the cross bar drives the crankshaft to rotate through the first connecting rod and the crank, the connecting rod journal on the crankshaft rotates around the axis of the crankshaft, driving the second connecting rod to move, and the second connecting rod finally drives the press slider to move up and down. The structure of the present invention is compact, which can effectively convert rotational motion into linear motion, realizing an ideal slider motion curve. By adjusting the parameters of each component, multiple different slider motion curves can be realized, and it can be applied to high-precision and high-efficiency presses. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0028] Figure 1is the front view of some embodiments provided by this application;

[0029] Figure 2 is the side view of some embodiments provided by this application.

[0030] Explanation of reference numerals: 1 - support shaft; 2 - large gear; 3 - multi - rod assembly; 4 - drive assembly; 5 - slider; 6 - press body; 11 - first support shaft; 12 - second support shaft; 21 - first large gear; 22 - second large gear; 31 - cross bar; 32 - first connecting rod; 33 - crank; 34 - crankshaft; 35 - second connecting rod; 341 - connecting rod journal; 41 - motor; 42 - coupling; 43 - pinion; 111 - first shaft end baffle; 121 - second shaft end baffle. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this disclosure / this application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of this application and its application or use.

[0032] Embodiment 1

[0033] This embodiment introduces a multi - rod symmetric transmission mechanism device for a press. Refer to Figure 1 and Figure 2 , the multi - rod symmetric transmission mechanism in this embodiment for the press includes a support shaft 1, a multi - rod assembly 3, and a drive assembly 4. Among them, a large gear 2 is rotatably arranged on the support shaft 1. The multi - rod assembly 3 includes a cross bar 31 axially and eccentrically arranged on the large gear 2. A first connecting rod 32 is connected to the cross bar 31 through a rotating pair. A crank 33 is connected to the first connecting rod 32 through a rotating pair. A crankshaft 34 is fixedly connected to the crank 33. The crankshaft 34 is rotatably arranged on the support shaft 1. The crankshaft 34 has a connecting rod journal 341. The connecting rod journal 341 and the crank 33 are respectively located on both sides of the support shaft 1. A second connecting rod 35 is connected to the connecting rod journal 341 through a rotating pair. The second connecting rod 35 is connected to the press slider 5 through a rotating pair. The axis of the large gear 2 and the axis of the crankshaft 34 are relatively eccentrically arranged. It should be noted that in this embodiment, the relative eccentricity value e between the axis of the large gear 2 and the axis of the crankshaft 34 is less than any one of the length value of the crank 33, the length value of the first connecting rod 32, and the vertical distance value between the axis of the large gear 2 and the cross bar 31. At the same time, the sum of the relative eccentricity value between the axis of the large gear 2 and the axis of the crankshaft 34 and any one of the length value of the crank 33, the length value of the first connecting rod 32, and the vertical distance value between the axis of the large gear 2 and the cross bar 31 is always less than the sum of the other two values. Further, the drive assembly 4 is used to drive the large gear 2 to rotate.

[0034] In this embodiment, the driving component 4 drives the large gear 2 to rotate. The rotation of the large gear 2 drives the movement of the horizontally arranged cross bar 31 which is eccentrically arranged. The cross bar 31 drives the crankshaft 34 to rotate through the first connecting rod 32 and the crank 33. The connecting rod journal 341 on the crankshaft 34 rotates around the axis of the crankshaft 34, driving the movement of the second connecting rod 35. The second connecting rod 35 finally drives the press slider 5 to move up and down. The structure of this solution is compact, which can effectively convert the rotational motion into a linear motion and achieve an ideal motion curve of the slider 5. By adjusting the parameters of each component, various different motion curves of the slider 5 can be realized, which can be applied to high-precision and high-efficiency presses.

[0035] In this embodiment, the end of the crankshaft 34 on one side of the connecting rod journal 341 is rotatably connected to the press body 6. The crankshaft 34 is fixed to the machine tool through the first support shafts 11 on both sides of the connecting rod journal 341, enhancing the stability of the entire transmission mechanism. The rotation of the connecting rod journal 341 drives the connecting rod to move, thereby driving the slider 5 to move up and down. In order to enable the force on the connecting rod journal 341 to be evenly transmitted to the first support shaft 11 and the machine tool, it is ensured that the crankshaft 34 can better maintain the shape and position accuracy when bearing heavy loads. In this embodiment, the distances from the connecting rod journal 341 to the support shaft 1 and the machine tool are the same.

[0036] In this embodiment, the driving member includes a motor 41, a coupling 42 and a small gear 43. The small gear 43 meshes with the large gear 2. The output end of the motor 41 is connected to the small gear 43 through the coupling 42. The motor 41 serves as a power source and can provide a stable and controllable rotational motion. By connecting the output end of the motor 41 to the small gear 43 through the coupling 42, the smooth transmission of power can be ensured, reducing vibration and impact. The meshing transmission between the small gear 43 and the large gear 2 has the characteristics of high efficiency and reliability. Gear transmission can transmit a large torque while maintaining a high transmission accuracy. This helps to ensure the stability and durability of the transmission mechanism. At the same time, the power requirement of the motor 41 is also reduced.

[0037] Embodiment 2:

[0038] Based on the same inventive concept as Embodiment 1, refer to Figure 1 And Figure 2, the multi-link symmetric transmission mechanism of the press in this embodiment includes a support shaft 1, a multi-link assembly 3, and a drive assembly 4. Among them, a large gear 2 is rotatably arranged on the support shaft 1. In this example, the large gear 2 includes a first large gear 21 and a second large gear 22 arranged coaxially. The multi-link assembly 3 includes a cross bar 31 axially and eccentrically arranged between the first large gear 21 and the second large gear 22. To enable the cross bar 31 to receive the driving forces from the two gears more evenly and ensure more balanced force transmission. In this embodiment, the connecting rod is rotatably connected to the middle of the cross bar 31. Through the arrangement of the first large gear 21 and the second large gear 22, the cross bar 31 receives the driving forces from the two gears, making the movement smoother. And the two coaxially arranged gears can provide a more stable support structure, thereby increasing the stiffness of the entire transmission mechanism. It helps to maintain the stability and accuracy of the mechanism, especially when bearing heavy loads or moving at high speeds.

[0039] Furthermore, the support shaft 1 includes a first support shaft 11 and a second support shaft 12. A first shaft end baffle 111 for fixing the first large gear 21 is provided on the first support shaft 11, and a second shaft end baffle 121 for fixing the second large gear 22 is provided on the second support shaft 12. The first support shaft 11 and the second support shaft 12 can provide more stable support for the first large gear 21 and the second large gear 22. It helps to reduce vibrations and noises caused by unstable support and improve the running smoothness of the mechanism. The settings of the first shaft end baffle 111 and the second shaft end baffle 121 ensure the axial fixation of the first large gear 21 and the second large gear 22, preventing axial movement during operation. It helps to maintain the meshing accuracy and transmission efficiency of the gears and improve the reliability of the mechanism.

[0040] In this embodiment, the driving member includes a motor 41, a coupling 42, and two small gears 43. The two small gears 43 are respectively meshed with the first large gear 21 and the second large gear 22.

[0041] Furthermore, a first connecting rod 32 is rotatably connected to the cross bar 31. A crank 33 is rotatably connected to the first connecting rod 32. A crankshaft 34 is fixedly connected to the crank 33. The crankshaft 34 is rotatably arranged on the support shaft 1. The crankshaft 34 has a connecting rod journal 341. The connecting rod journal 341 and the crank 33 are respectively located on both sides of the first support shaft 11. A second connecting rod 35 is rotatably connected to the connecting rod journal 341. The second connecting rod 35 is rotatably connected to the press slider 5. The axis of the large gear 2 and the axis of the crankshaft 34 are relatively eccentrically arranged. The drive assembly 4 is used to drive the large gear 2 to rotate.

[0042] In this embodiment, the crank 33 is fixedly connected to the crankshaft 34 by a key, and the crank 33 and the crankshaft 34 have multiple fixed angles. The crank 33 and the crankshaft 34 are fixedly connected using a key (such as a flat key, a spline key, etc.). This has the advantages of simple structure, easy manufacturing and installation, etc. Through the torque transmission function of the key, the relative position between the crank 33 and the crankshaft 34 can be ensured to be stable. By adjusting the fixed angle between the crank 33 and the crankshaft 34, the motion curve of the slider 5 can be flexibly changed. It can meet different working conditions and load requirements.

[0043] Embodiment Three:

[0044] This embodiment provides a press, including the multi-link symmetric transmission mechanism of the press in Example One or Embodiment Two.

[0045] The above are only the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the technical principles of the present disclosure / the present application, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present disclosure / the present application.

Claims

1. A multi-rod symmetrical transmission mechanism for a press, characterized in that: include: A support shaft (1), wherein a large gear (2) is rotatably arranged on the support shaft (1); The multi-rod assembly (3) comprises a cross rod (31) axially eccentrically arranged on the large gear (2), the cross rod (31) being rotatably connected to a first connecting rod (32), the first connecting rod (32) being rotatably connected to a crank (33), the crank (33) being fixedly connected to a crankshaft (34), the crankshaft (34) being rotatably arranged on the support shaft (1), the crankshaft (34) having a connecting rod journal (341), the connecting rod journal (341) and the crank (33) being respectively located on both sides of the support shaft (1), the connecting rod journal (341) being rotatably connected to a second connecting rod (35), the second connecting rod (35) being rotatably connected to a press slide (5), and the axis of the large gear (2) and the axis of the crankshaft (34) being eccentrically arranged relative to each other; A driving assembly (4) is used to drive the large gear (2) to rotate.

2. The multi-rod symmetrical transmission mechanism of a press machine according to claim 1, characterized in that: The large gear (2) comprises a first large gear (21) and a second large gear (22) which are coaxially arranged, and the crossbar (31) is arranged between the first large gear (21) and the second large gear (22).

3. The multi-rod symmetrical transmission mechanism of a press machine according to claim 2, characterized in that: The support shaft (1) comprises a first support shaft (11) and a second support shaft (12); the first support shaft (11) is provided with a first shaft end baffle (111) for fixing the first large gear (21); the second support shaft (12) is provided with a second shaft end baffle (121) for fixing the second large gear (22); the connecting rod journal (341) and the crank (33) are respectively located on both sides of the first support shaft (11).

4. The multi-rod symmetrical transmission mechanism for a press machine according to claim 3, characterized in that: The end of the crankshaft (34) located on one side of the connecting rod journal (341) is rotatably connected to the press machine bed (6).

5. The multi-rod symmetrical transmission mechanism for a press machine according to claim 2, characterized in that: The connecting rod is rotatably connected to the middle portion of the cross rod (31).

6. The multi-rod symmetrical transmission mechanism for a press machine according to claim 1, characterized in that: The driving member comprises a motor (41), a coupling (42) and a pinion gear (43); the pinion gear (43) is meshed with the large gear (2); and the output end of the motor (41) is connected to the pinion gear (43) via the coupling (42).

7. The multi-rod symmetrical transmission mechanism for a press machine according to claim 1, characterized in that: The crank (33) and the crankshaft (34) are fixedly connected via a key.

8. The multi-rod symmetrical transmission mechanism for a press machine according to claim 7, characterized in that: The crank (33) and the crankshaft (34) have a plurality of fixed angles.

9. The multi-rod symmetrical transmission mechanism for a press machine according to claim 1, characterized in that: The relative eccentricity between the axis of the large gear (2) and the axis of the crankshaft (34) is smaller than any one of the length of the crank (33), the length of the first connecting rod (32), and the vertical distance between the axis of the large gear (2) and the crossbar (31); at the same time, the sum of the relative eccentricity between the axis of the large gear (2) and the axis of the crankshaft (34) and any one of the length of the crank (33), the length of the first connecting rod (32), and the vertical distance between the axis of the large gear (2) and the crossbar (31) is always smaller than the sum of the other two values.

10. A press machine, characterized in that: The press comprises a press multi-rod symmetrical transmission mechanism as described in any one of claims 1-9.

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