Mechanical servo-stretch-pad overload protection device and monitoring adjustment method

Abstract

The application provides a mechanical servo-stretching-pad overload protection device and a monitoring and adjusting method, and relates to the field of stamping. The adjusting assembly comprises a screw rod, a first nut, a piston sleeve, a piston, a connecting block and a gland. The connecting block is connected with a top crown of a press machine. The connecting block is fixedly connected with the gland. An inner cavity is formed between the connecting block and the gland. The piston is arranged in the inner cavity. The piston is connected with the connecting block. The piston sleeve is slidingly arranged between the piston and the connecting block. A closed annular cavity is formed between the piston sleeve, the piston and the connecting block. One end of the first nut penetrates one end of the gland and slides in the inner cavity. The one end of the first nut is in mutual extrusion with the piston sleeve. The first nut is threadedly connected with the screw rod. The screw rod is used for being connected with a driving assembly. The closed annular cavity is used for being connected with a hydraulic assembly. When the pressure on the top crown is too large, the oil in the closed annular cavity is discharged by opening the hydraulic assembly. The top crown is lowered and is not pressed any more. The internal structure of the mechanical servo-stretching-pad is ensured to be not damaged.

Description

Technical Field

[0001] This invention relates to the field of stamping technology, and more specifically, to a mechanical servo tension pad overload protection device and monitoring and adjustment method. Background Technology

[0002] In the stamping process of sheet metal, the stretching pad installed inside the press base provides blank holder force to the sheet metal, preventing defects such as wrinkling. With the development of industry, servo stretching pads have gradually replaced the original gas stretching pads.

[0003] In a mechanical servo stretching pad, a servo motor drives a lead screw to rotate. The lead screw is connected to a nut, which in turn is connected to an upper crown. The crown provides blank holder force for sheet metal forming via an ejector rod. Currently, the connection between the nut and the crown is a rigid connection, meaning the crown and nut are connected together using bolts.

[0004] During the sheet metal forming process, mechanical failures may cause the pressure on the nut to exceed the maximum working pressure of the mechanical servo stretching pad. The pressure is transmitted to the inside of the mechanical servo stretching pad through the lead screw, causing damage to the internal structure of the mechanical servo stretching pad. Summary of the Invention

[0005] The problem that this invention aims to solve is that in existing mechanical servo stretch pads, the nut and the top crown are rigidly connected, which can easily damage the internal structure of the mechanical servo stretch pad under excessive working pressure.

[0006] To address the aforementioned problems, this invention provides a mechanical servo tension pad overload protection device, comprising an adjustment component and a hydraulic component; The adjusting assembly includes a lead screw, a first nut, a piston sleeve, a piston, a connecting block, and a pressure cap. The connecting block is connected to the top crown of the press and is fixedly connected to the pressure cap, forming an inner cavity between the connecting block and the pressure cap. The piston is disposed in the inner cavity and is connected to the connecting block. The piston sleeve is slidably installed between the piston and the connecting block, forming a sealed annular cavity between the piston sleeve, the piston, and the connecting block. One end of the first nut passes through the pressure cap and slides in the inner cavity to press against the piston sleeve. The first nut is threadedly connected to the lead screw, which is connected to a drive assembly. The sealed annular cavity is connected to a hydraulic assembly.

[0007] Optionally, the adjusting assembly further includes a spherical pad and a spherical ring, both of which are slidably installed in the inner cavity. One end of the spherical pad is in contact with one end of the spherical ring, and the contact area is spherical. The other end of the spherical ring is in contact with the piston sleeve, and the other end of the spherical pad is connected to one end of the first nut.

[0008] Optionally, the hydraulic assembly includes a pressure sensor, a check valve, a solenoid directional valve, and an oil tank. The pressure sensor is connected to the sealed annular cavity via an oil pipe. The inlet of the solenoid directional valve is connected to the sealed annular cavity, and the outlet of the solenoid directional valve is connected to the oil tank. One end of the check valve is connected to the sealed annular cavity, and the other end of the check valve is connected to the oil inlet. The check valve is used to prevent oil in the sealed annular cavity from leaking from the oil inlet.

[0009] Optionally, the hydraulic assembly further includes a throttle valve, with the drain port of the solenoid directional valve connected to one end of the throttle valve and the other end of the throttle valve connected to the oil tank.

[0010] Optionally, the hydraulic assembly further includes a safety valve and a switching valve, wherein the input port of the safety valve is connected to the sealed annular cavity, and the output port of the safety valve is connected to the oil tank; one end of the switching valve is connected to the sealed annular cavity, and the other end of the switching valve is connected to the oil tank.

[0011] Optionally, the mechanical servo tension pad overload protection device further includes a position monitoring component. The position monitoring component is used to monitor the position of the slider in the press. The position monitoring component includes an encoder, a gear, a rack, and a bracket. The bracket is used to be mounted on a column guide rail connected to a column. The encoder is mounted on the bracket. The encoder's rotating shaft is connected to the gear shaft of the gear. The rack is used to be connected to the slider guide rail. The slider guide rail is mounted on the slider. The gear meshes with the rack.

[0012] On the other hand, the present invention also provides a method for monitoring and adjusting a mechanical servo tension pad, based on the above-mentioned mechanical servo tension pad overload protection device, the method for monitoring and adjusting a mechanical servo tension pad includes: Monitor the pressure on the connecting block to obtain the real-time pressure value; When the real-time pressure value is greater than the pressure threshold, the hydraulic component is controlled to operate and the press is stopped. The hydraulic component is used to discharge the oil in the sealed annular cavity.

[0013] Optionally, the monitoring of the pressure on the connecting block to obtain the real-time pressure value includes: The real-time pressure data uploaded by the pressure sensor is obtained to obtain the real-time pressure value experienced by the connecting block.

[0014] Optionally, before controlling the hydraulic components to operate and pausing the press when the real-time pressure value exceeds the pressure threshold, the method further includes: Obtain the data uploaded by the encoder to get the height and position information of the slider.

[0015] Optionally, the step of controlling the hydraulic components to operate and pausing the press when the real-time pressure value is greater than the pressure threshold includes: When the real-time pressure value is greater than the pressure threshold, the electromagnetic reversing valve is opened to discharge the oil in the sealed annular cavity, the driving device of the slider is stopped, and the driving assembly of the drive screw is accelerated.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides an overload protection device and monitoring and adjustment method for a mechanical servo tension pad. When the mechanical servo tension pad is working normally, the sealed annular cavity is filled with oil. When the pressure on the top crown is too high, the hydraulic component is activated to discharge the oil from the sealed annular cavity. The connecting block, the piston connected to the connecting block, and the pressure cap descend as the oil in the sealed annular cavity is discharged. When the connecting block descends, since the top crown is connected to the connecting block, the top crown also descends a certain distance. After descending, the top crown is no longer under pressure. Therefore, even if the pressure on the top crown is too high, since the top crown and the first nut are no longer rigidly connected, the pressure is released through the adjustment of the adjustment component, ensuring that the internal structure of the mechanical servo tension pad will not be damaged. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall structure of the press is shown; Figure 2 A three-dimensional schematic diagram of a mechanical servo stretching pad in an embodiment of the present invention is shown; Figure 3 A cross-sectional view of the mechanical servo stretch pad adjustment assembly in an embodiment of the present invention is shown; Figure 4 A schematic diagram of the hydraulic assembly for the mechanical servo stretching pad in an embodiment of the present invention is shown; Figure 5 A schematic diagram of slider installation in an embodiment of the present invention is shown; Figure 6 It shows Figure 5 A magnified view of a section at point A in the middle; Figure 7 A schematic diagram of the position detection component in an embodiment of the present invention is shown; Figure 8 It shows Figure 6 A magnified view of a section at point B in the middle.

[0018] Explanation of reference numerals in the attached figures: 1. Lead screw; 2. First nut; 3. Spherical washer; 4. Spherical ring; 5. Piston sleeve; 6. Piston; 7. Connecting block; 8. Gland; 9. Large lip seal; 10. Small lip seal; 11. Pressure sensor; 12. Switch valve; 13. Safety valve; 14. Check valve; 15. Solenoid directional valve; 16. Throttle valve; 17. Oil tank; 18. Top crown; 19. Servo motor; 20. Synchronous belt; 21. Encoder; 22. Coupling; 23. Gear shaft; 24. Gear; 25. Rack; 26. Bracket; 27. Encoder mounting plate; 28. Rack mounting plate; 29. ​​Snap ring; 30. Second nut; 31. Washer; 32. Cotter pin; 33. Slider; 34. Column; 35. Slider guide rail; 36. Column guide rail; 37. Sealed annular cavity. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in sequences other than those illustrated or described herein.

[0021] In the description of this specification, references to terms such as "embodiment," "one embodiment," and "one implementation" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or implementation is included in at least one embodiment or implementation of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or implementations.

[0022] Figure 1 A schematic diagram of the overall structure of the press is shown. The press is divided into upper and lower parts. The upper part is mounted on the column 200. Driven by the main transmission system 100 of the press, the upper mold slider 300 of the upper part drives the upper mold to move up and down reciprocally. The lower part of the press, the base 400, is installed in the pit. The top crown 500 moves up and down in the base 400 under the drive of the mechanical servo stretching pad 600 and its drive device. When the top crown 500 moves upward, it drives the ejector rod and the pressure ring to move upward. The pressure ring and the upper mold work together to restrict the edge movement of the sheet metal. The upper mold presses down to press the sheet metal between the upper mold and the lower mold for shaping.

[0023] Figure 2A three-dimensional schematic diagram of a mechanical servo tension pad in an embodiment of the present invention is shown. The overload protection device for the mechanical servo tension pad includes an adjustment component and a hydraulic component. like Figure 3 and Figure 4 The adjusting assembly includes a lead screw 1, a first nut 2, a piston sleeve 5, a piston 6, a connecting block 7, and a pressure cap 8. The connecting block 7 is connected to the top crown 18 of the press and is fixedly connected to the pressure cap 8, forming an inner cavity between the connecting block 7 and the pressure cap 8. The piston 6 is disposed in the inner cavity and is connected to the connecting block 7. The piston sleeve 5 is slidably installed between the piston 6 and the connecting block 7, forming a sealed annular cavity 37 between the piston sleeve 5, the piston 6, and the connecting block 7. One end of the first nut 2 passes through the pressure cap 8 and slides in the inner cavity to press against the piston sleeve 5. The first nut 2 is threadedly connected to the lead screw 1, which is connected to a drive assembly, which can be a servo motor that directly drives the lead screw 1 to rotate. The sealed annular cavity 37 is connected to the hydraulic assembly.

[0024] exist Figure 2 In the process, the upper end of the adjusting component is connected to the top crown 18, and the lower end of the adjusting component is connected to the drive component of the lead screw 1. The drive component of the lead screw 1 includes a servo motor 19 and a synchronous belt 20. The servo motor 19 is installed inside the press base, and a pulley is connected to the output shaft of the servo motor 19. Another pulley is connected to the bottom of the lead screw 1, and the synchronous belt 20 is fitted between the two pulleys. When the servo motor 19 starts, it drives the lead screw 1 to rotate through the synchronous belt 20. When the lead screw 1 rotates, it drives the first nut 2 in the adjusting component to move up and down. The movement of the first nut 2 drives the entire adjusting component and the top crown 18 connected to the adjusting component to move up and down. Figure 3 In the middle section, piston 6 is connected to the upper part of connecting block 7 by bolts, and gland 8 is connected to the bottom of connecting block 7 by bolts. Two sealing grooves are opened on the lower outer side of piston 6 and the inner side of connecting block 7, and large lip seals 9 are installed in each of the four sealing grooves. A sealing groove is opened on the upper outer side of piston 6, and a small lip seal 10 is installed in the sealing groove. The multiple sealing rings ensure the sealing effect of the annular cavity 37. Connecting block 7 is connected to top crown 18 by bolts. Furthermore, the drive mechanism of lead screw 1 and first nut 2 can be replaced by a gear and rack, rack cylinder, or hydraulic cylinder, etc.

[0025] In this embodiment, when the mechanical servo stretching pad is working normally, the sealed annular cavity is filled with oil. When the pressure on the top crown 18 is too high, the oil in the sealed annular cavity is discharged by opening the hydraulic component. The connecting block 7, the piston 6 connected to the connecting block 7, and the pressure cap 8 descend as the oil in the sealed annular cavity is discharged. When the connecting block 7 descends, the top crown 18 also descends a certain distance because it is connected to the connecting block 7. After descending, the top crown 18 is no longer under pressure. Therefore, even if the pressure on the top crown 18 is too high, since the top crown 18 and the first nut 2 are no longer rigidly connected, the pressure is released by the adjustment of the adjustment component, ensuring that the internal structure of the mechanical servo stretching pad will not be damaged.

[0026] In one embodiment of the present invention, such as Figure 3 and Figure 4 As shown, the adjustment assembly also includes a spherical pad 3 and a spherical ring 4. Both the spherical pad 3 and the spherical ring 4 are slidably installed in the inner cavity. One end of the spherical pad 3 is in contact with one end of the spherical ring 4, and the contact area is spherical. The other end of the spherical ring 4 is in contact with the piston sleeve 5, and the other end of the spherical pad 3 is connected to one end of the first nut 2.

[0027] Specifically, the first nut 2 and the spherical washer 3 are connected by bolts. The upper part of the spherical washer 3 is in contact with the spherical ring 4, and the contact surface between the two is spherical. The upper part of the spherical ring 4 is a piston sleeve 5, and the inside of the piston sleeve 5 is a piston 6. During the sheet metal forming process, the top crown 18 is subjected to a large vertical component force and a small horizontal component force. The spherical contact between the spherical washer 3 and the spherical ring 4 helps the tension pad withstand the impact of the horizontal component force. In addition, multiple overload protection devices can be installed under the top crown 18, for example... Figure 2 Four overload protection devices are installed. Since different positions of the top crown 18 may be subjected to different pressures, the screw nut in each overload protection device can provide different magnitudes of force to cooperate with the sheet metal drawing process. The four different magnitudes of force will generate an off-center load. The spherical pad 3 and the spherical ring 4 are spherical at the contact point, which can avoid mechanical damage caused by the off-center load. In addition, when one of the overload protection devices is subjected to excessive pressure, the internal sealed annular cavity 37 is forced to release oil, and a small drop occurs in the overload protection device at this point. At this time, the connecting block 7 in the overload protection device and the central axis of the first nut 2 may deviate and not be completely aligned. However, since the contact point between the spherical pad 3 and the spherical ring 4 is spherical, when the central axis of the connecting block 7 and the central axis of the first nut 2 are not aligned, the spherical ring 4 will slide on the spherical pad 3, eliminating the lateral pressure caused by the misalignment of the central axes of the connecting block 7 and the first nut 2.

[0028] In one embodiment of the present invention, such as Figure 4The hydraulic assembly includes a pressure sensor 11, a one-way valve 14, a solenoid directional valve 15, and an oil tank 17. The pressure sensor 11 is connected to the sealed annular cavity 37 via an oil pipe. The oil inlet of the solenoid directional valve 15 is connected to the sealed annular cavity 37, and the oil outlet of the solenoid directional valve 15 is connected to the oil tank 17. One end of the one-way valve 14 is connected to the sealed annular cavity 37, and the other end of the one-way valve 14 is connected to the oil inlet. The one-way valve 14 is used to prevent the oil in the sealed annular cavity 37 from leaking from the oil inlet.

[0029] Specifically, the solenoid directional valve 15 is in the right position when the oil pressure is at its normal value. The pressure sensor 11 can monitor the oil pressure in the sealed annular cavity 37 in real time. When the pressure value exceeds the pressure threshold, the pressure sensor 11 sends a signal to switch the solenoid directional valve 15 to the left position. The oil flows back to the oil tank 17 through the solenoid directional valve 15, depressurizing the sealed annular cavity 37. During the depressurization process, the top crown 18, connecting block 7, piston 6, small lip seal 10 and two large lip seal 9 mounted on piston 6, and pressure cap 8 will descend together, thus avoiding damage to the structure of the mechanical servo stretching pad. After depressurization, the pressure sensor 11 sends a signal to switch the solenoid directional valve 15 to the right position. Oil can then be injected into the sealed annular cavity 37 through the oil inlet and check valve 14, and the mechanical servo stretching pad can resume operation. In addition, in order to control the orderly operation of each valve and drive component, a control unit can be set up for the overload protection device. The control unit is used to receive the signal sent by the pressure sensor 11 and can control the solenoid directional valve 15 to switch the working position, etc.

[0030] In one embodiment of the present invention, such as Figure 4 The hydraulic assembly also includes a throttle valve 16. The drain port of the solenoid directional valve 15 is connected to one end of the throttle valve 16, and the other end of the throttle valve 16 is connected to the oil tank 17. By adjusting the opening of the throttle valve 16 between the solenoid directional valve 15 and the oil tank 17, the speed at which the oil is discharged from the sealed annular cavity 37 can be controlled, thereby controlling the descent speed of the crown 18.

[0031] In one embodiment of the present invention, such as Figure 4 The hydraulic assembly also includes a safety valve 13 and a switching valve 12. The input port of the safety valve 13 is connected to the sealed annular cavity 37, and the output port of the safety valve 13 is connected to the oil tank 17. One end of the switching valve 12 is connected to the sealed annular cavity 37, and the other end of the switching valve 12 is connected to the oil tank 17.

[0032] Specifically, the switch valve 12 is normally closed. If necessary during equipment maintenance, the switch valve 12 can be manually switched to the open state. The safety valve 13 provides double protection for the overload protection device. If the solenoid directional valve 15 cannot switch normally when the oil is overloaded, the safety valve 13 can form a passage to guide the oil into the oil tank 17.

[0033] In one embodiment of the present invention, such as Figure 5-7 As shown, the mechanical servo tension pad overload protection device also includes a position monitoring component. The position monitoring component is used to monitor the position of the slider 33 in the press. The position monitoring component includes an encoder 21, a gear 24, a rack 25, and a bracket 26. The bracket 26 is used to be mounted on a column guide rail 36 connected to the column 34. The encoder 21 is mounted on the bracket 26. The rotating shaft of the encoder 21 is connected to the gear shaft 23 of the gear 24. The rack 25 is used to be connected to the slider guide rail 35. The slider guide rail 35 is mounted on the slider 33. The gear 24 meshes with the rack 25.

[0034] Specifically, the position monitoring component primarily monitors the position of slider 33 in real time. When the stretching pad is overloaded, similar to a vehicle having a braking distance, the slider 33 of the press will not immediately stop moving. Therefore, when the stretching pad is overloaded, the position monitoring device can detect the problematic slider position and record the slider 33's position information for subsequent maintenance. Additionally, based on the displacement of the top crown 18 and slider 33, it can indirectly reflect the displacement of the lower and upper dies, thus proactively controlling slider 33 to stop moving. Simultaneously, it controls the mechanical servo stretching pad's drive assembly (e.g., servo motor 19) to drive the lead screw 1, causing the connecting block 7 and top crown 18 to accelerate downwards. After the press stops in an emergency, slider 33 will drive the upper die upwards, and work will resume once everything returns to normal. In traditional presses, this is usually done in... Figure 1 A displacement monitoring component is installed near the main drive system 100 of the press. By monitoring the rotation of the gears in the main drive system 100, the displacement and position of the press slide can be calculated indirectly. However, there is a gap between the gears in the main drive system 100, and the gap will gradually increase as the press is used, making the calculated slide position inaccurate.

[0035] In this embodiment, as Figure 5 While the mechanical servo stretching pad is working, the slider 33 moves vertically up and down along the column 34, and the position information of the slider 33 is fed back to the control unit in real time.

[0036] like Figure 6 and Figure 7The bracket 26 is fixed on the column guide rail 36, which is mounted on the column 34. The encoder mounting plate 27 is mounted on the bracket 26, and the encoder 21 is fixed on the encoder mounting plate 27. The encoder 21 is connected to the gear shaft 23 via the coupling 22. The gear shaft 23 and the gear 24 transmit torque via a flat key. The gear 24 is axially positioned by a snap ring 29 mounted on the gear shaft 23. The rack mounting plate 28 is mounted on the slider guide rail 35, which is mounted on the side of the slider 33. Figure 6 and Figure 8 The rack 25 is fixed to the rack mounting plate 28 by the second nut 30 and the washer 31. The cotter pin 32 passes through the top of the rack and the second nut 30, serving to prevent the second nut 30 from rotating and loosening. During the operation of the press, the slider 33 drives the rack 25 to move up and down. The linear motion of the rack 25 is converted into the rotational motion of the gear 24. The rotational motion of the gear 24 causes the encoder 21 to send an angle signal, thereby directly obtaining the real-time height of the slider 33.

[0037] In one embodiment of the present invention, a method for monitoring and adjusting a mechanical servo tension pad is also provided. Based on the above-mentioned mechanical servo tension pad overload protection device, the method for monitoring and adjusting the mechanical servo tension pad includes: Step 1: Monitor the pressure on the connecting block 7 and obtain the real-time pressure value; Step 2: When the real-time pressure value is greater than the pressure threshold, control the hydraulic component to operate and control the press to stop working. The hydraulic component is used to discharge the oil in the sealed annular cavity 37.

[0038] When the pressure on the monitoring connecting block 7 exceeds the pressure threshold, the hydraulic components are activated to discharge the oil in the sealed annular cavity. The connecting block 7, the piston 6 connected to the connecting block 7, and the pressure cap 8 descend as the oil in the sealed annular cavity is discharged. Consequently, the top crown 18 also descends a certain distance. After descending, the top crown 18 is no longer under pressure, ensuring that the internal structure of the mechanical servo stretching pad is not damaged.

[0039] In one embodiment of the present invention, the monitoring of the pressure on the connecting block 7 to obtain the real-time pressure value includes: The real-time pressure data uploaded by the pressure sensor 11 is acquired to obtain the real-time pressure value experienced by the connecting block 7. The oil pressure within the sealed annular cavity 37 is obtained through the pressure sensor 11, thereby indirectly obtaining the real-time pressure value experienced by the connecting block 7.

[0040] In one embodiment of the present invention, before controlling the hydraulic components to operate and controlling the press to stop working when the real-time pressure value is greater than the pressure threshold, the method further includes: The data uploaded by encoder 21 is acquired to obtain the height position information of slider 33. Slider 33 drives rack 25 to move up and down, rack 25 drives gear 24 to rotate, and the rotation of gear 24 causes encoder 21 to send an angle signal. Encoder 21 sends the angle signal to the control center, thereby directly obtaining the real-time height of slider 33.

[0041] In one embodiment of the present invention, the step of controlling the hydraulic components to operate and controlling the press to suspend operation when the real-time pressure value is greater than the pressure threshold includes: When the real-time pressure value exceeds the pressure threshold, the electromagnetic reversing valve 15 is opened to discharge the oil in the sealed annular cavity 37, the drive device of the slider 33 stops moving, thus stopping the slider 33's displacement, and the drive assembly of the drive screw 1 (e.g., servo motor 19) is accelerated to make the screw 1 drive the connecting block 7 and the top crown 18 to move downwards at an accelerated speed. The position monitoring component mainly monitors the slider's position in real time. When the stretching pad is overloaded, the position monitoring device can detect the problematic slider position and record the slider 33's position information for subsequent maintenance, etc. At the same time, the servo motor of the mechanical servo stretching pad will also drive the connecting block 7 and the top crown 18 to move downwards at an accelerated speed through the screw 1. After the press is stopped in an emergency, the slider 33 is controlled to drive the upper die upwards, and work resumes after everything returns to normal. The drive device of the slider 33 can be as follows: Figure 1 The gear set and motor constitute the main drive system 100 of the press. Based on the real-time height of the slider 33, the slider 33 is controlled to rise a certain safe distance, so that the upper and lower dies separate.

[0042] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. An overload protection device for a mechanical servo tension pad, characterized in that, Includes regulating components and hydraulic components; The adjusting assembly includes a lead screw (1), a first nut (2), a piston sleeve (5), a piston (6), a connecting block (7), and a pressure cap (8). The connecting block (7) is used to connect to the top crown (18) of the press. The connecting block (7) is fixedly connected to the pressure cap (8), and an inner cavity is formed between the connecting block (7) and the pressure cap (8). The piston (6) is disposed in the inner cavity and is connected to the connecting block (7). The piston sleeve (5) is slidably installed between the piston (6) and the connecting block (7), and a sealed structure is formed between the piston sleeve (5), the piston (6), and the connecting block (7). The annular cavity (37) has one end of the first nut (2) passing through the pressure cap (8) and sliding in the inner cavity to be used to press against the piston sleeve (5). The first nut (2) is threadedly connected to the lead screw (1), which is used to connect to the drive assembly. The sealed annular cavity (37) is used to communicate with the hydraulic assembly. The real-time pressure value is obtained by monitoring the pressure on the connecting block (7). When the real-time pressure value is greater than the pressure threshold, the hydraulic assembly is controlled to operate and the press is controlled to stop working. The hydraulic assembly is used to discharge the oil in the sealed annular cavity (37). The adjustment assembly also includes a spherical pad (3) and a spherical ring (4). The spherical pad (3) and the spherical ring (4) are slidably installed in the inner cavity. One end of the spherical pad (3) is attached to one end of the spherical ring (4), and the attachment point is spherical. The other end of the spherical ring (4) is in contact with the piston sleeve (5), and the other end of the spherical pad (3) is connected to one end of the first nut (2). There are multiple mechanical servo tension pad overload protection devices. Multiple mechanical servo tension pad overload protection devices are arranged in parallel to support the top crown (18). Each mechanical servo tension pad overload protection device is driven independently.

2. The mechanical servo tension pad overload protection device according to claim 1, characterized in that, The hydraulic components include a pressure sensor (11), a check valve (14), a solenoid directional valve (15), and an oil tank (17). The pressure sensor (11) is connected to the sealed annular cavity (37) via an oil pipe. The oil inlet of the solenoid directional valve (15) is connected to the sealed annular cavity (37), and the oil outlet of the solenoid directional valve (15) is connected to the oil tank (17). One end of the check valve (14) is connected to the sealed annular cavity (37), and the other end of the check valve (14) is connected to the oil inlet. The check valve (14) is used to prevent the oil in the sealed annular cavity (37) from leaking from the oil inlet.

3. The mechanical servo tension pad overload protection device according to claim 2, characterized in that, The hydraulic assembly also includes a throttle valve (16), the oil outlet of the solenoid directional valve (15) is connected to one end of the throttle valve (16), and the other end of the throttle valve (16) is connected to the oil tank (17).

4. The mechanical servo tension pad overload protection device according to claim 2, characterized in that, The hydraulic assembly also includes a safety valve (13) and a switching valve (12). The input port of the safety valve (13) is connected to the sealed annular cavity (37), and the output port of the safety valve (13) is connected to the oil tank (17). One end of the switching valve (12) is connected to the sealed annular cavity (37), and the other end of the switching valve (12) is connected to the oil tank (17).

5. The mechanical servo tension pad overload protection device according to claim 2, characterized in that, It also includes a position monitoring component for monitoring the position of the slider (33) in the press. The position monitoring component includes an encoder (21), a gear (24), a rack (25), and a bracket (26). The bracket (26) is mounted on a column guide rail (36) connected to the column (34). The encoder (21) is mounted on the bracket (26). The shaft of the encoder (21) is connected to the gear shaft (23) of the gear (24). The rack (25) is connected to the slider guide rail (35). The slider guide rail (35) is mounted on the slider (33). The gear (24) meshes with the rack (25).

6. A method for monitoring and adjusting a mechanical servo tension pad, characterized in that, The mechanical servo tension pad overload protection device as described in claim 5 includes: Monitor the pressure on the connecting block (7) to obtain the real-time pressure value; When the real-time pressure value is greater than the pressure threshold, the hydraulic component is controlled to operate and the press is stopped. The hydraulic component is used to discharge the oil in the sealed annular cavity (37).

7. The mechanical servo tension pad monitoring and adjustment method according to claim 6, characterized in that, The pressure on the monitoring connection block (7) is used to obtain real-time pressure values, including: The real-time pressure data uploaded by the pressure sensor (11) is obtained to obtain the real-time pressure value received by the connecting block (7).

8. The mechanical servo tension pad monitoring and adjustment method according to claim 6, characterized in that, Before controlling the hydraulic components to operate and pausing the press when the real-time pressure value exceeds the pressure threshold, the method further includes: Get the data uploaded by the encoder (21) and obtain the height position information of the slider (33).

9. The mechanical servo tension pad monitoring and adjustment method according to claim 8, characterized in that, The step of controlling the hydraulic components to operate and pausing the press when the real-time pressure value is greater than the pressure threshold includes: When the real-time pressure value is greater than the pressure threshold, the electromagnetic reversing valve (15) is opened to discharge the oil in the sealed annular cavity (37), the driving device of the slider (33) is stopped, and the driving assembly of the drive screw (1) is accelerated.

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