A servo press with high precision, low inertia and stable pressure maintaining

Abstract

This invention relates to a servo press with high precision, low inertia, and stable pressure holding. It includes a main frame assembly, a cooling and vibration damping device, a symmetrical servo drive assembly, a nested transmission assembly, a high-torque transmission assembly, a scissor press pressure holding device, a pressure pad stabilizing drive assembly, and the cooling and vibration damping device. The symmetrical servo drive assembly, nested transmission assembly, high-torque transmission assembly, and cooling and vibration damping device are located on the upper part of the main frame assembly. The scissor press pressure holding device and the pressure pad stabilizing drive assembly are located in the middle and lower parts of the main frame assembly, respectively. The scissor press pressure holding device is connected to the main frame assembly. This servo press employs symmetrical servo drive, nested gear transmission, hydraulic scissor press pressure holding, and is equipped with a water-cooled cooling and vibration damping structure. It features high precision, low inertia, stable pressure holding, and high operational stability, making it suitable for metal stamping processes with high requirements for machining accuracy, pressure holding stability, and equipment operational reliability.

Description

Technical Field

[0001] This invention relates to the field of press technology, specifically to a servo press with high precision, low inertia, and stable pressure holding. Background Technology

[0002] Servo presses, as core equipment in precision metal processing, rely on the combination of servo drives and mechanical transmission to achieve processes such as stamping and pressure holding, and are widely used in manufacturing fields such as automobiles and precision machinery. However, in actual industrial applications, existing traditional servo press solutions still have many unresolved technical problems, specifically as follows:

[0003] 1. Low transmission efficiency and limited torque output: Traditional servo presses often use a single servo motor as the power source, combined with a multi-stage gear set to achieve power transmission and speed regulation. This transmission method has obvious shortcomings: First, the transmission chain is long, and the mechanical friction loss generated by gear meshing and bearing rotation is large, resulting in low power transmission efficiency and insufficient energy utilization. Second, the torque amplification capacity of multi-stage gear transmission is limited. When facing heavy load conditions such as heavy sheet metal stamping and thick-walled part forming, it cannot output sufficient torque, which can easily lead to insufficient power and processing jams. Third, the rigid connection characteristics of the coupling in the transmission system introduce unavoidable transmission backlash, which can easily cause impacts when the equipment starts, stops, or reverses, not only reducing operational stability but also accelerating the wear of parts.

[0004] 2. Insufficient stability of machining accuracy, affecting yield: On the one hand, during gear transmission, due to machining errors, assembly deviations, or long-term wear, problems such as gear meshing misalignment and uneven tooth surface contact are prone to occur. This can lead to a decrease in transmission accuracy or even cause individual gears to break due to overload, resulting in equipment shutdown. On the other hand, the transmission system generates a lot of heat when running at high speed, causing thermal deformation of core components such as gears, drive shafts, and frames, which changes the transmission fit accuracy. At the same time, the vibration generated by the equipment operation will be directly transmitted to the stamping die and workpiece, resulting in stamping position deviation and uneven holding pressure, which greatly reduces the yield and makes it difficult to meet the requirements of high-precision machining.

[0005] 3. Poor flexibility in pressure holding function and lack of customized processing capability: The pressure holding structure of traditional servo presses is mostly a mechanical design with fixed stroke and fixed pressure. It cannot flexibly adjust the pressure holding pressure and pressure holding stroke distance according to the processing requirements of parts with different thicknesses and materials. It can only realize a single mode of pressure holding operation. At the same time, most equipment does not have a secondary stamping function. For complex parts that require step-by-step forming and multiple pressure holding, it cannot complete precise customized processing. The process adaptability is poor, which limits the application scenarios of the equipment.

[0006] 4. Insufficient stability and shortened service life of the pressure pad device: As an important auxiliary component of a servo press, the pressure pad device is mainly used to cooperate with the mold to achieve precise positioning and auxiliary forming of the workpiece. Traditional pressure pad drive structures often adopt a simple lifting and guiding design, which is prone to problems such as lifting interference, guiding deviation, and jamming during operation. Moreover, the friction and wear between the pressure pad and the guiding mechanism are relatively large. Long-term use will lead to a decrease in guiding accuracy and running jams, which not only affects the processing accuracy but also shortens the overall service life of the equipment and increases maintenance costs.

[0007] 5. Lack of integrated cooling and vibration reduction measures limits precision and reliability: Existing servo presses often employ independent cooling and vibration reduction structures, equipped only with separate cooling components such as cooling fans and cooling pipes, or separately added vibration damping pads and buffers. This fails to achieve a synergistic effect between cooling and vibration reduction. On one hand, a single cooling structure cannot quickly dissipate heat from the transmission system, motor, and other components, leaving thermal deformation problems unresolved. On the other hand, independent vibration reduction structures cannot effectively suppress the transmission of multi-source vibrations, and the impact of vibration on machining accuracy persists, further limiting the precision and long-term operational reliability of the equipment. Summary of the Invention

[0008] The purpose of this invention is to provide a servo press with high precision, low inertia, and stable pressure holding. This press adopts symmetrical servo drive, nested gear transmission, hydraulic scissor fork pressure holding, and is equipped with a water-cooled cooling and vibration reduction structure. It features high precision, low inertia, stable pressure holding, and high operational stability, and is suitable for metal stamping processes with high requirements for processing accuracy, pressure holding stability, and equipment operational reliability.

[0009] The technical solution adopted by this invention to solve its technical problem is: a servo press with high precision, low inertia, and stable pressure holding, comprising a main frame assembly, a cooling and vibration damping device, and a scissor press pressure holding device, wherein the cooling and vibration damping device and the scissor press pressure holding device are respectively connected to the main frame assembly; it also includes a high-torque transmission device, a pressure pad stabilizing drive device, a nested transmission device, and a symmetrical servo transmission device, wherein the symmetrical servo transmission device, the nested transmission device, and the high-torque transmission device are respectively located on the upper part of the main frame assembly, and the pressure pad stabilizing drive device is located on the lower part of the main frame assembly; the symmetrical servo transmission device includes a motor B, a drive shaft B, and a gear C, wherein the motor has an internal cavity, and the drive shaft B... The drive shaft B is a gear shaft, with a gear C located in the middle of the drive shaft B. The nested transmission device includes a gear B, a gear sleeve, and a support shaft B. The gear B and gear sleeve are mounted on the support shaft B, and the gear sleeve is installed inside the gear B. The gear B meshes with the gear C. The gear sleeve has a shoulder B and an inter-tooth groove B on its outer side. The high-torque transmission device includes a housing gear A and a support shaft A. The gear A has a shoulder A and an inter-tooth groove A on its outer side. The gear A meshes with the gear sleeve, and the shoulder A engages with the inter-tooth groove B. The shoulder B engages with the inter-tooth groove A. Eccentric circles are symmetrically arranged on the front and rear sides of the gear A, and a connecting rod is loosely fitted on each eccentric circle.

[0010] Furthermore, the main frame includes a box-shaped base, a body column, a transmission box, a transmission box cover, a slider, an upper mold, and a lower mold. The body column is welded to the upper end of the box-shaped base, and the transmission box is welded and installed on the upper end of the body column. The slider, upper mold, and lower mold are sequentially arranged between the transmission box and the box-shaped base. The box-shaped base has an internal cavity, and a guide plate is provided on the inner side of the cavity. The guide plate is inserted into the guide groove to guide the drive gear plate and prevent the drive gear plate from deflecting during its reciprocating motion. A motor mounting seat A is welded to the outside of the box-shaped base, and a hinge seat A is provided on the upper end face of the slider. The hinge shaft A is installed on the hinge seat A, and a scissor guide groove is provided on the inner side of the slider.

[0011] Furthermore, the box-shaped base is provided with foundation mounting seats at the four corners, the cavity is located in the middle of the box-shaped base, and convex plates are symmetrically provided on the front and rear sides of the cavity. A rectangular slide rail is provided on the inner side of the machine body column, so that the convex blocks of the slider and the upper and lower molds can be inserted into the rectangular slide rail, and the slider and the upper mold can be guided to prevent the slider and the upper mold from deflecting, ensuring the accuracy of the linear movement of the slider and the upper mold, and the design of the closed ends on the upper and lower sides of the rectangular slide rail can play a limiting role. The transmission box has a transmission box cover at its upper end. The front and rear ends of the transmission box are symmetrically provided with a support shaft hole B, a drive shaft hole, and a support shaft hole A. Support shaft B, drive shaft, and support shaft A are respectively installed in the support shaft hole B, drive shaft hole, and support shaft hole A. The slider and upper mold have protrusions at their four corners, which mate with the rectangular slide rails of the machine body column. The lower mold also has protrusions at its four corners and is mounted to the bottom of the rectangular slide rails of the machine body column via these protrusions. The slider is a hollow cuboid structure. There are two scissor guide grooves symmetrically located on the inner surface of the slider. A set of ribs is symmetrically provided on the front and rear outer sides of the slider. The symmetrical ribs on the front and rear outer sides of the slider improve rigidity and ensure that the hinge seat does not deform under stress.

[0012] Furthermore, the motor B is a servo motor, and there are four motors B. There are two drive shafts B arranged in parallel at the top and bottom. Each pair of motors B is symmetrically installed at both ends of the upper and lower drive shafts B. The drive shafts B extend directly into the motor B and are rigidly connected to the rotor, eliminating the need for traditional couplings and realizing an integrated structure of direct drive between the servo motor and the drive shaft.

[0013] Furthermore, gear B has an internal spline, and there are two gears of B arranged horizontally to the left and right. Gear B is located in the center of the upper and lower drive shafts B. The right gear B meshes with gear C on drive shaft B, and the left gear B meshes with the right gear B. The gear sleeve has an external spline, and there are two gear sleeves that mate with the internal splines of gear B through the external splines. Gear B and gear sleeve are loosely fitted on the support shaft B. Both ends of gear B and gear sleeve have sleeves. There are two shoulders B and two inter-tooth grooves B, which are arranged alternately and symmetrically. By connecting gear B and gear sleeve with internal and external splines, the traditional two-stage transmission is transformed into a single-stage transmission, simplifying the transmission structure. That is, gear B drives the gear sleeve on it to directly mesh with gear A, replacing the traditional three-gear meshing transmission. Moreover, the internal and external spline mating improves the mating accuracy and transmits greater torque.

[0014] Furthermore, the shoulder A and the inter-tooth groove A are provided in multiple staggered and symmetrical arrangements. Gear A and support shaft A are loosely fitted. Sleeves are provided at both ends of gear A. There are four connecting rods, with a ring in the middle of the connecting rod and round holes at both ends. A hinge shaft B is installed in the round hole at the upper end of the connecting rod. The shoulder A and the inter-tooth groove B are engaged, and vice versa, to ensure the correct meshing of gear A and gear sleeve. That is, by engaging shoulder B and inter-tooth groove A, misalignment between gear A and gear sleeve is corrected, preventing individual teeth from being overloaded and breaking. It can also enhance torque transmission strength and reduce the overall weight of the gear while ensuring load-bearing strength, thus achieving lightweighting of the equipment.

[0015] Furthermore, the scissor lift pressure holding device includes a scissor lift rod, a hydraulic cylinder, and a scissor lift hinge shaft. The scissor lift hinge shaft is located below the slider of the main frame device and is installed in the scissor lift guide groove. The hydraulic cylinder is mounted on the scissor lift hinge shaft. The scissor lift rod is located between the slider and the upper die, allowing for flexible adjustment of the pressure holding pressure and stroke according to the part processing requirements, achieving stable pressure holding. Additionally, this scissor lift structure can also be used for secondary stamping.

[0016] Furthermore, the pressure pad stabilizing device includes a hydraulic washer, a push rod, a push plate, an upper arc plate, a drive gear plate, a lower arc plate, a drive gear, and a motor A. The hydraulic washer is located above the lower mold in the main frame, and the push plate, the upper arc plate, the drive gear plate, the lower arc plate, the drive gear, and the motor A are respectively located below the slider in the main frame.

[0017] Furthermore, the hydraulic washer has a hollow rectangular frame structure. The lower end face of the hydraulic washer has four circular blind holes with internal threads at its four corners. The upper end face of the push plate also has four circular blind holes with internal threads at its four corners. The hydraulic washer and the circular blind holes on the push plate are coaxially arranged. Multiple push rods are provided, each with external threads at both ends. The hydraulic washer and the push plate are connected via push rods, which are connected to the main frame device. The middle of the push plate has a circular through hole with internal threads. The top of the upper arc plate has a cylindrical externally threaded cylinder. The externally threaded cylinder of the upper arc plate mates with the circular through hole with internal threads on the push plate and is fixed by a fastening nut. The upper arc plate is located directly below the push plate. The height of the push plate can be adjusted via the externally threaded cylinder. The upper and lower arc plates are both semi-circular arc plates. There are two drive gear plates, with the upper and lower arc plates welded to the upper and lower end faces of the two drive gear plates, respectively. The front and rear ends of the drive gear plate are respectively provided with guide grooves, and the inner side of the drive gear plate is provided with a rack; the drive gear is located in the middle of the two drive gear plates. The drive gear is a partial gear, and the toothed part of the drive gear occupies a central angle of 120 degrees. The drive gear is mounted on the drive shaft A, which is driven by the motor A. The motor A is connected to the motor mounting base A, and the motor mounting base A is connected to the main frame.

[0018] Furthermore, the cooling and vibration damping device includes a water-cooled box, a water-cooled box cover, and a water-cooled box mounting base. The water-cooled box mounting base is welded and installed on both sides of the transmission box. The water-cooled box is installed on the water-cooled box mounting base. The upper end face of the water-cooled box is provided with a water-cooled box cover, and the water-cooled box is provided with cooling water.

[0019] The beneficial effects of this invention are:

[0020] The servo press of this invention achieves integrated transmission of the servo motor and drive shaft through a direct-drive structure of a symmetrical servo transmission device, reducing power transmission loss and improving operational stability. Symmetrically distributed servo motors are used for collaborative drive to achieve power superposition. The internal and external spline fit of the nested transmission device simplifies the transmission structure, achieving efficient torque transmission and improving meshing accuracy. The shoulder and inter-tooth groove of the high-torque transmission device ensure correct gear meshing and prevent overload of individual teeth, while also achieving lightweight gear design. The scissor fork pressure holding device maintains stamping stability and allows for flexible stroke adjustment, adapting to the processing requirements of parts of different thicknesses and enabling secondary stamping. The evenly distributed design of the hinge seats ensures that the stamped parts are subjected to pressure... Uniform force; the local gear of the pressure pad stabilizing drive device cooperates with the drive gear plate to achieve smooth lifting and lowering of the pressure pad without motion interference; the cooperation between the guide groove and the guide plate improves the lifting and guiding accuracy; the water-cooling structure of the cooling and vibration damping device cools the transmission system, prevents thermal deformation of parts, absorbs vibration energy, reduces friction and wear, and improves transmission accuracy; the rectangular slide rail and protrusion of the main frame cooperate to ensure the linear motion accuracy of the slider and the mold; the rib structure improves the rigidity and stress stability of the slider; the clearance fit between the push rod and the through hole of the lower mold and the application of grease reduce friction and wear and extend the service life of the equipment; the adjustable design of the push plate height further improves the adaptability of the pressure pad device. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 This is a half-sectional structural diagram of the box-shaped base of the present invention.

[0023] Figure 3 This is a schematic diagram of the power system of the present invention.

[0024] Figure 4 This is a schematic diagram of the symmetrical servo transmission device of the present invention.

[0025] Figure 5 This is a schematic diagram of the nested transmission device and the high-torque transmission device of the present invention.

[0026] Figure 6 This is a partial structural diagram of the meshing point between gear A and gear sleeve in this invention.

[0027] Figure 7 This is a partial structural schematic diagram of the scissor lift pressure holding device of the present invention.

[0028] Figure 8 This is a schematic diagram of the pressure pad stabilizing device of the present invention.

[0029] Figure 9 This is a schematic diagram of the cooling and vibration damping device of the present invention.

[0030] In the picture:

[0031] 1. Box-type base; 2. Motor mounting bracket A; 3. Motor A; 4. Push plate; 5. Lower mold; 6. Hydraulic washer; 7. Upper mold; 8. Slider; 9. Transmission box; 10. Transmission box cover; 11. Water-cooled box cover; 12. Water-cooled box; 13. Motor B; 14. Buffer pad; 15. Motor mounting bracket B; 16. Hinge bracket A; 17. Scissor lift pressure holding device; 18. Machine body column; 19. Rectangular slide rail; 20. Bolt B; 21. Foundation mounting bracket; 22. Lower arc plate; 23. Guide groove; 24. Upper arc plate; 25. Hinge shaft A; 26. Hinge shaft B; 27. Connecting rod; 28. Support shaft A; 29. ​​Gear B; 30. Gear A; 31. Gear sleeve; 3 2. Eccentric circle; 33. Bolt A; 34. Support shaft B; 35. Drive shaft B; 36. Drive gear plate; 37. Drive gear; 38. Internal spline; 39. Shoulder A; 40. Inter-tooth groove A; 41. External spline; 42. Inter-tooth groove B; 43. Shoulder B; 44. Rib plate; 45. Protrusion; 46. Scissor lift guide groove; 47. Hydraulic cylinder; 48. Scissor lift hinge shaft; 49. Scissor lift rod; 50. Hinge shaft C; 51. Fastening nut; 52. Water-cooled box mounting base; 53. Support shaft hole B; 54. Drive shaft hole; 55. Support shaft hole A; 56. Sleeve A; 57. Sleeve B; 58. Guide plate; 59. Gear C; 60. Drive shaft A; 61. Push rod. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] like Figures 1 to 9As shown, the present invention discloses a servo press with high precision, low inertia, and stable pressure holding, comprising a main frame assembly, a symmetrical servo transmission device, a nested transmission device, a high-torque transmission device, a scissor press pressure holding device 17, a pressure pad stabilizing drive device, and a cooling and vibration damping device. The symmetrical servo transmission device, the nested transmission device, the high-torque transmission device, and the cooling and vibration damping device are located on the upper part of the main frame assembly, while the scissor press pressure holding device 17 and the pressure pad stabilizing drive device are located in the middle and lower parts of the main frame assembly, respectively. The main frame includes a box-shaped base 1, a machine body column 18, a transmission box 9, a transmission box cover 10, a slider 8, an upper mold 7, and a lower mold 5. The machine body column 18 is welded to the upper end of the box-shaped base 1, and the transmission box 9 is welded and installed on the upper end of the machine body column 18. The slider 8, the upper mold 7, and the lower mold 5 are located sequentially between the transmission box 9 and the box-shaped base 1. The lower mold 5 has four circular through holes. The box-shaped base 1 has a cavity inside, and a guide plate 58 is provided on the inner side of the cavity. A motor mounting base A2 is welded to the outside of the box-shaped base 1. Motor A3 is mounted on motor mounting base A2. A hinge seat A16 is provided on the upper end face of slider 8, and hinge shaft A25 is mounted on hinge seat A16. A scissor guide groove 46 is opened on the inner side of slider 8. Four foundation mounting seats 21 are provided at the four corners of the box-type base 1. The cavity is located in the center of the box-type base 1 and has a rectangular structure. Guide plates 58 are symmetrically arranged on the front and rear sides of the cavity. Four machine body columns 18 are circumferentially welded to the upper end face of the box-type base 1. A rectangular slide rail 19 is opened on the inner side of the machine body columns 18. A transmission box cover 10 is provided on the upper end of the transmission box 9. Support shaft holes B53 and drive shaft holes 54 are symmetrically opened on the front and rear ends of the transmission box 9. The support shaft A28 hole, support shaft B53 hole, drive shaft hole 54 and support shaft A55 are respectively installed in the support shaft B34, drive shaft and support shaft A28; the slider 8 and the upper mold 7 are provided with protrusions 45 at the four corners, the protrusions 45 of the slider 8 and the upper mold 7 cooperate with the rectangular slide rail 19 of the machine body column 18, the lower mold 5 is also provided with protrusions 45 at the four corners, the lower mold 5 is installed at the bottom of the rectangular slide rail 19 of the machine body column 18 through the protrusions 45 and fixed by bolts B20; there are four hinge seats A16 and they are respectively welded to the four corners of the upper end face of the slider 8. The shape of the hinge seat A16 is a near-isosceles triangle structure, and the hinge shaft A25 There are four of them, which are respectively connected to the connecting rod 27 and the hinge seat A16. The slider 8 is a hollow cuboid structure. There are two scissor guide grooves 46, which are symmetrically located on the inner surface of the slider 8. The scissor guide grooves 46 are rounded rectangular groove structures. A set of ribs 44 are symmetrically provided on the front and rear outer sides of the slider 8. There are two ribs 44 in each set, which are arranged horizontally at the top and bottom. The cross-section of the rib 44 is pentagonal.

[0034] The present invention provides guide plates 58 symmetrically arranged on the front and rear sides of the cavity, so that the guide plates 58 are inserted into the guide groove 23 to guide the drive tooth plate 36 and prevent the drive tooth plate 36 from deflecting when it moves up and down.

[0035] The present invention provides a rectangular slide rail 19 on the inner side of the machine body column 18, so that the slider 8 and the protrusions 45 of the upper mold 7 and the lower mold 5 are inserted into the rectangular slide rail 19, which guides the slider 8 and the upper mold 7, prevents the slider 8 and the upper mold 7 from deflecting, ensures the accuracy of the linear movement of the slider 8 and the upper mold 7, and provides a limiting function through the closed ends on the upper and lower sides of the rectangular slide rail 19.

[0036] Combination Figure 4 As shown, the symmetrical servo drive device includes a motor B13, a drive shaft B35, and a gear C59. The motor B13 has an internal cavity, and the drive shaft B35 extends directly into the cavity of the motor B13 and is directly connected to the rotor. The drive shaft B35 is a gear shaft, and a gear C59 is located in the middle of the drive shaft B35. The motor B13 is a servo motor, and there are four motors B13. There are two drive shafts B35, which are arranged in parallel at the top and bottom. Every two motors B13 are symmetrically installed at both ends of the upper and lower drive shafts B13. The drive shaft B35 extends directly into the interior of the motor B13 and is rigidly connected to the rotor. The gears C59 and B29 on the drive shaft B35 are herringbone teeth.

[0037] This invention allows the drive shaft B35 to be directly inserted into the cavity and directly connected to the rotor, which can reduce the number of parts, simplify the mechanism, significantly improve the transmission efficiency and operational stability of the system, and save axial installation space.

[0038] This invention allows the drive shaft B35 to extend directly into the motor B13 and be rigidly connected to the rotor. The lower part of the motor B13 is provided with a buffer pad 14 and a motor mounting base B15. The traditional coupling is eliminated, realizing a direct-drive integrated structure of the servo motor B and the drive shaft B35.

[0039] The present invention sets gears C59 and B29 on drive shaft B35 as herringbone teeth, which can improve transmission smoothness and eliminate axial force.

[0040] This invention installs motors B13 at both ends of the drive shaft B35 to achieve coordinated driving by two motors B and symmetrical output of the two motors B. This allows for power superposition, easily obtaining the total torque or power that a single motor B cannot achieve, thus meeting the driving requirements of heavy loads. Furthermore, it ensures that the drive shaft B35 is subjected to symmetrical forces, enabling the drive shaft B35 to transmit power stably and precisely.

[0041] Combination Figure 5As shown, the nested transmission device mainly consists of gear B29, gear sleeve 31, and support shaft B34. Gear B29 and gear sleeve 31 are mounted on support shaft B34 and fastened by bolt A33. Gear sleeve 31 is installed inside gear B29, and gear B29 meshes with gear C59. Gear sleeve 31 has a shoulder B43 and an inter-tooth groove B42 on its outer side. Gear B29 has an internal spline 38. There are two gears B29, arranged horizontally to the left and right. Gears B29 are located in the center of the upper and lower drive shafts B35. The right gear B29 meshes with gear C59 on drive shaft B35, and the left gear B meshes with the right gear B. Gear sleeve 31 has an external spline 41 on its outer side. There are two gear sleeves 31, which are engaged with the internal spline 38 of gear B29 via external spline 41. Gear B29 and gear sleeve 31 are loosely fitted on support shaft B34. Both ends of gear B29 and gear sleeve 31 are provided with sleeves B57. There are two shoulders B43 and two inter-tooth grooves B42, which are arranged alternately and symmetrically. The radial dimension of gear B29 is 3 to 5 times the radial dimension of gear C59, the radial dimension of gear B29 is 3 to 5 times the radial dimension of gear sleeve 31, and the radial dimension of gear A30 is 1.5 to 2 times the radial dimension of gear B29.

[0042] This invention connects gear B29 and gear sleeve 31 with internal and external splines, transforming the traditional two-stage transmission into a single-stage transmission, thus simplifying the transmission structure. Specifically, gear B29 drives gear sleeve 31 to directly mesh with gear A30, replacing the traditional three-gear meshing transmission. Furthermore, the internal and external spline connection improves the fitting accuracy and transmits greater torque.

[0043] The present invention provides sleeves at both ends of gear B29 and gear sleeve 31 to prevent gear B29 and gear sleeve 31 from moving axially.

[0044] Combination Figure 6 As shown, the high-torque transmission device mainly consists of gear A30 and support shaft A28. Gear A30 has a shoulder A39 and an inter-tooth groove A40 on its outer side. Gear A30 meshes with gear sleeve 31. Shoulder A39 cooperates with inter-tooth groove B42, and shoulder B43 cooperates with inter-tooth groove A40. Eccentric circles 32 are symmetrically installed on the front and rear sides of gear A30. Each eccentric circle 32 is loosely fitted with a connecting rod 27 through a sleeve A56. There are eight shoulders A39 and eight inter-tooth grooves A40, which are arranged symmetrically and alternately. Gear A30 is loosely fitted on support shaft A28. Sleeves are provided at both ends of gear A30. There are four connecting rods 27. A ring is provided in the middle of the connecting rod 27. Circular holes are provided at both ends of the connecting rod 27. A hinge shaft B26 is installed in the circular hole at the upper end of the connecting rod 27.

[0045] This invention uses shoulder A39 to engage with inter-tooth groove B42 and shoulder B43 to engage with inter-tooth groove A40 to ensure proper meshing of gear A30 and gear sleeve 31. Specifically, by engaging shoulder B43 with inter-tooth groove A40, misalignment between gear A30 and gear sleeve 31 is corrected, preventing individual teeth from being overloaded and breaking. Furthermore, it can enhance torque transmission strength and reduce the overall weight of the gears while ensuring load-bearing strength, thus achieving lightweighting of the equipment.

[0046] In this invention, the connecting rod 27 is loosely fitted onto the eccentric circle 32, so that the connecting rod 27 drives the slider 8 to rise and fall with a small swing amplitude.

[0047] The present invention installs a hinge shaft B26 in the upper circular hole of the connecting rod 27, so that the two connecting rods 27 can swing synchronously.

[0048] Combination Figure 7 As shown, the scissor lift pressure holding device 17 includes scissor lift rods 49, hydraulic cylinders 47, and scissor lift hinge shafts 48. The scissor lift hinge shafts 48 are located below the slider 8 and are installed in the scissor lift guide groove 46. Preferably, there are four scissor lift rods 49, two of which are connected at their outer ends by the scissor lift hinge shafts 48, and the middle parts of the other two scissor lift rods 49 are connected by hinge shafts C50. The hydraulic cylinder 47 is installed on the scissor lift hinge shafts 48. Circular holes are opened at both ends and the middle part of the scissor lift rods 49.

[0049] The present invention provides a scissor bar 49 between the slider 8 and the upper mold 7, which can flexibly adjust the holding pressure and stroke according to the processing requirements of the parts to achieve stable holding pressure; in addition, secondary stamping can also be achieved through this scissor structure.

[0050] The present invention distributes the hinge seats A16 evenly above the slider 8 to ensure uniform force during the pressure holding process and improve the pressure holding accuracy.

[0051] Combination Figure 8As shown, the pressure pad stabilizing device mainly consists of a hydraulic washer 6, push rods 61, push plate 4, upper arc plate 24, drive gear plate 36, lower arc plate 22, drive gear 37, and motor A3. The hydraulic washer 6 is located above the lower mold 5, while the push plate 4, upper arc plate 24, drive gear plate 36, lower arc plate 22, drive gear 37, and motor A3 are located below the slider 8. The hydraulic washer 6 has a hollow rectangular frame structure, with four circular blind holes with internal threads at the four corners of its lower end face. The push plate 4 also has four circular blind holes with internal threads at the four corners of its upper end face. The circular blind holes on the hydraulic washer 6 and the push plate 4 are coaxially arranged. There are four push rods 61, each with external threads at both ends. The hydraulic washer 6 is connected to the push plate 4 by a push rod 61. The push rod 61 is installed in the through hole of the lower mold 5. The push rod 61 and the through hole of the lower mold 5 are clearance fit and are lubricated with grease. The push plate 4 has a circular through hole with internal threads in the center. The top of the upper arc plate 24 has a cylindrical external thread. The cylindrical external thread of the upper arc plate 24 fits with the circular through hole with internal threads of the push plate 4 and is fixed by a fastening nut 51. The upper arc plate 24 is located directly below the push plate 4. The height of the push plate 4 can be adjusted by the cylindrical external thread. The upper arc plate 24 and the lower arc plate 22 are both semi-circular arc plates. There are two drive gear plates 36. The upper arc plate 24 and the lower arc plate 22 are welded to the upper and lower end faces of the two drive gear plates 36, respectively. The front and rear ends of the drive gear plate 36 are respectively provided with guide grooves 23. The guide grooves 23 are rounded rectangles and cooperate with the guide plate 58 inside the box-shaped base 1. The inner side of the drive gear plate 36 is provided with a rack. The drive gear 37 is located in the middle of the two drive gear plates 36. The drive gear 37 is a partial gear. The toothed part of the drive gear 37 occupies a central angle of 120 degrees. The drive gear 37 is mounted on the drive shaft A60. The drive shaft A60 is driven by the motor A3. The motor A3 is mounted on the motor mounting base A2. The motor mounting base A2 is welded to the box-shaped base 1.

[0052] In this invention, the push rod 61 is installed in the through hole of the lower mold 5. The push rod 61 and the through hole of the lower mold 5 are clearance fit and are coated with grease, which facilitates the free up and down movement of the push rod 61 in the through hole and reduces the friction and wear between the push rod 61 and the lower mold 5 by the grease, thus extending the service life.

[0053] This invention employs a partial tooth design for the drive gear 37, which meshes with the drive gear plates 36 on both sides to achieve smooth lifting and lowering of the pressure pad stabilizing device. Specifically, when the toothed portion of the drive gear 37 contacts the left drive gear plate 36, it will drive the drive gear plates 36 on both sides to rise. Then, the drive gear 37 continues to rotate. When the toothed portion of the drive gear 37 disengages from the left drive gear plate 36, the toothed portion of the drive gear 37 will contact the right drive gear plate 36, driving the drive gear plates 36 on both sides to fall. This partial tooth design prevents interference with the lifting and lowering of the drive gear plates 36.

[0054] The present invention provides guide grooves 23 on both sides of the drive tooth plate 36, which cooperate with the guide plate 58 in the box-shaped base 1 to ensure the guiding accuracy during the lifting process and improve the running stability.

[0055] The present invention designs the upper and lower arc plates into an arc shape, which allows the drive gear 37 to maintain a uniform gap with the inner wall of the ring when rotating, thus preventing local collisions.

[0056] Combination Figure 9 As shown, the cooling and vibration damping device mainly consists of a water-cooled box 12, a water-cooled box cover 11, and a water-cooled box mounting base 52. The water-cooled box mounting base 52 is welded and installed on both sides of the transmission box 9. The water-cooled box 12 is installed on the water-cooled box mounting base 52. The upper end face of the water-cooled box 12 is provided with the water-cooled box cover 11. Cooling water is provided inside the water-cooled box 12. There are two water-cooled box mounting bases 52, which are symmetrically welded and installed on both sides of the transmission box 9. There are two water-cooled boxes 12. The upper end face of the water-cooled box 12 has an internally threaded circular water injection hole in the center. The water-cooled box cover 11 is provided with an external thread.

[0057] The present invention provides water-cooled boxes 12 on both sides of the transmission box 9. This design can both cool the transmission system inside the transmission box 9 and reduce the vibration of the transmission system. Specifically, the cooling water in the water-cooled box 12 cools the heat transferred from the transmission system to the transmission box 9, preventing thermal deformation of the transmission system and ensuring motion accuracy. At the same time, the cooling water in the water tank can absorb the vibration energy transferred from the transmission system to the transmission box 9, that is, convert the vibration energy into the wave energy of the water for absorption, ensuring transmission accuracy, reducing friction and wear, and further improving the stability of equipment operation and processing accuracy.

[0058] The above description is merely an illustration of some principles of the present invention. This specification is not intended to limit the present invention to the specific structures and applicable scope shown. Therefore, all possible modifications and equivalents that may be used fall within the scope of the patent application of this invention.

[0059] Except for the technical features described in the specification, all other technical features are known to those skilled in the art.

Claims

1. A servo press with high precision, low inertia, and stable pressure holding, comprising a main frame assembly, a cooling and vibration damping device, and a scissor press pressure holding device, wherein the cooling and vibration damping device and the scissor press pressure holding device are respectively connected to the main frame assembly, characterized in that, It also includes a high-torque transmission device, a pressure pad stabilizing drive device, a nested transmission device, and a symmetrical servo transmission device. The symmetrical servo transmission device, the nested transmission device, and the high-torque transmission device are respectively located on the upper part of the main frame device, and the pressure pad stabilizing drive device is located on the lower part of the main frame device. The symmetrical servo transmission device includes a motor B, a drive shaft B, and a gear C. The motor has an internal cavity, and the drive shaft B extends directly into the motor cavity and is directly connected to the rotor. The drive shaft B is a gear shaft, and the gear C is located in the middle of the drive shaft B. The nested transmission device includes a gear B, a gear sleeve, and a support shaft B. The gear B and the gear sleeve are mounted on the support shaft B, and the gear sleeve is installed inside the gear B. Gear B meshes with gear C. The outer side of the gear sleeve is provided with a shoulder B and an inter-tooth groove B. The high-torque transmission device includes a housing gear A and a support shaft A. The outer side of gear A is provided with a shoulder A and an inter-tooth groove A. Gear A meshes with the gear sleeve. The shoulder A and the inter-tooth groove B cooperate. The shoulder B and the inter-tooth groove A cooperate. Eccentric circles are symmetrically provided on the front and rear sides of gear A. A connecting rod is loosely fitted on each eccentric circle. Motor B is a servo motor. There are four motors B. There are two drive shafts B arranged in parallel at the top and bottom. Every two motors B are symmetrically arranged at the two ends of the upper and lower drive shafts B. The drive shaft B extends into the interior of motor B and is rigidly connected to the rotor.

2. The servo press with high precision, low inertia, and stable pressure holding as described in claim 1, characterized in that, The main frame includes a box-shaped base, a body column, a transmission box, a transmission box cover, a slider, an upper mold, and a lower mold. The body column is welded to the upper end of the box-shaped base. The transmission box is welded and installed on the upper end of the body column. The slider, the upper mold, and the lower mold are arranged sequentially between the transmission box and the box-shaped base. The box-shaped base has a cavity inside, and a guide plate is provided on the inner side of the cavity. A motor mounting seat A is welded to the outside of the box-shaped base. A hinge seat A is provided on the upper end face of the slider. The hinge shaft A is installed on the hinge seat A. A scissor guide groove is provided on the inner side of the slider.

3. The servo press with high precision, low inertia and stable pressure holding according to claim 2, characterized in that, The box-shaped base has foundation mounting seats at its four corners. The cavity is located in the middle of the box-shaped base. The front and rear sides of the cavity are symmetrically provided with protruding plates. The inner side of the machine body column is provided with a rectangular slide rail. The upper end of the transmission box is provided with a transmission box cover. The front and rear ends of the transmission box are symmetrically provided with support shaft hole B, drive shaft hole and support shaft hole A. Support shaft B, drive shaft and support shaft A are installed in support shaft hole B, drive shaft hole and support shaft A respectively. The slider and the upper mold are provided with protrusions at their four corners. The protrusions of the slider and the upper mold cooperate with the rectangular slide rail of the machine body column. The lower mold is also provided with protrusions at its four corners. The lower mold is installed at the bottom of the rectangular slide rail of the machine body column through the protrusions. The slider is a hollow cuboid structure. There are two scissor guide grooves and they are symmetrically provided on the inner surface of the slider. A set of ribs is symmetrically provided on the front and rear outer sides of the slider.

4. The servo press with high precision, low inertia and stable pressure holding according to claim 1, characterized in that, Gear B has an internal spline. There are two gears B arranged horizontally to the left and right. Gear B is located in the middle of the upper and lower drive shafts B. The right gear B meshes with gear C on drive shaft B, and the left gear B meshes with the right gear B. The gear sleeve has an external spline. There are two gear sleeves, which engage with the internal spline of gear B through the external spline. Gear B and gear sleeve are loosely fitted on support shaft B. Sleeves are provided at both ends of gear B and gear sleeve. There are two shoulders B and two inter-tooth grooves B, which are arranged symmetrically and alternately.

5. The servo press with high precision, low inertia and stable pressure holding according to claim 1, characterized in that, The shoulder A and the tooth groove A are provided in multiple ways and are arranged symmetrically. The gear A is loosely fitted on the support shaft A. Sleeves are provided at both ends of the gear A. There are four connecting rods. A ring is provided in the middle of the connecting rod. Circular holes are provided at both ends of the connecting rod. A hinge shaft B is installed in the circular hole at the upper end of the connecting rod.

6. The servo press with high precision, low inertia and stable pressure holding according to claim 1, characterized in that, The scissor lift pressure holding device includes a scissor lift rod, a hydraulic cylinder, and a scissor lift hinge shaft. The scissor lift hinge shaft is located below the slider of the main frame and is installed in the scissor lift guide groove. The hydraulic cylinder is located on the scissor lift hinge shaft.

7. The servo press with high precision, low inertia and stable pressure holding according to claim 1, characterized in that, The pressure pad stabilizing device includes a hydraulic washer, a push rod, a push plate, an upper arc plate, a drive gear plate, a lower arc plate, a drive gear, and a motor A. The hydraulic washer is located above the lower mold in the main frame device, and the push plate, the upper arc plate, the drive gear plate, the lower arc plate, the drive gear, and the motor A are respectively located below the slider in the main frame device.

8. The servo press with high precision, low inertia and stable pressure holding according to claim 7, characterized in that, The hydraulic washer has a hollow rectangular frame structure. Each of the four corners of the lower end face of the hydraulic washer has a circular blind hole with internal threads. Similarly, each of the four corners of the upper end face of the push plate has a circular blind hole with internal threads. The hydraulic washer and the circular blind holes on the push plate are coaxially arranged. Multiple push rods are provided, each with external threads at both ends. The hydraulic washer and the push plate are connected via push rods, which are also connected to the main frame device. The push plate has a circular through hole with internal threads in the middle. The top of the upper arc plate has a cylindrical externally threaded cylinder. The externally threaded cylinder of the upper arc plate mates with the circular through hole with internal threads on the push plate and is fixed by a fastening nut. The upper arc plate is located directly below the push plate. The height of the push plate can be adjusted via the externally threaded cylinder. The upper and lower arc plates are both semi-circular arc plates. There are two drive gear plates, with the upper and lower arc plates welded to the upper and lower end faces of the two drive gear plates, respectively. The front and rear ends of the drive gear plate are respectively provided with guide grooves, and the inner side of the drive gear plate is provided with a rack; the drive gear is located in the middle of the two drive gear plates. The drive gear is a partial gear, and the toothed part of the drive gear occupies a central angle of 120 degrees. The drive gear is mounted on the drive shaft A, which is driven by the motor A. The motor A is connected to the motor mounting base A, and the motor mounting base A is connected to the main frame.

9. The servo press with high precision, low inertia and stable pressure holding according to claim 1, characterized in that, The cooling and vibration damping device includes a water-cooled box, a water-cooled box cover, and a water-cooled box mounting base. The water-cooled box mounting base is located on both sides of the transmission box. The water-cooled box is connected to the water-cooled box mounting base. The water-cooled box cover is located on the upper surface of the water-cooled box, and cooling water is provided inside the water-cooled box.

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