Heavy press rotary table

Abstract

The present application relates to the technical field of press, and discloses a heavy press rotary workbench, which comprises a supporting table, a rotary table rotatably connected to the upper surface of the supporting table, a first annular groove arranged on the upper surface of the supporting table, a second annular groove arranged on the lower surface of the rotary table, an installation space formed by the first annular groove and the second annular groove, a heavy load rolling element arranged in the installation space, a workbench matched with the upper surface of the rotary table, and a separable connection between the rotary table and the workbench, which is used to block the temperature transmission path of the workpiece to be processed in the rotary table. The rotary table and the workbench are supported by the heavy load rolling element, and the rotary table can rotate coaxially relative to the supporting table. The workbench and the rotary table are designed as a split structure, and the contact thermal resistance can be formed between the workbench and the rotary table when the workbench is placed on the rotary table.

Description

Technical Field

[0001] This invention relates to the field of press technology, specifically to a heavy-duty press rotary table. Background Technology

[0002] Presses are used to apply pressure to heavy workpieces to press them into the desired shape. Presses can drive a punch head to continuously impact heavy workpieces for stamping, or they can use the punch head to apply static pressure to heavy workpieces, using static pressure to deform the heavy workpieces.

[0003] Heavy workpieces need to be heated to a red-hot state before processing to increase their plasticity. The temperature of heavy workpieces may exceed 1000℃. The heat of heavy workpieces can be transferred downwards through heat conduction and heat radiation, causing the supporting structure below to be heated and thus increasing its plasticity. For heavy presses, under the weight of the heavy workpiece, the worktable, and the impact of the punch head, the worktable and its internal components are prone to deformation and accelerated wear.

[0004] When machining heavy workpieces, rotation may be required to facilitate processing at different positions. For heavy-duty presses, the weight of the heavy workpiece and the worktable supporting it can reach tons. Rotating heavy workpieces typically requires a crane to lift the worktable and rotate it, which in turn drives the heavy workpiece to rotate. This process is complex, time-consuming, and difficult to control the positional accuracy of the heavy workpiece. Summary of the Invention

[0005] In order to overcome the above-mentioned technical problems in the prior art, the present invention provides a heavy-duty press rotary table. By designing the worktable and the rotary table as a separate structure, when the worktable is placed on the rotary table, a contact thermal resistance can be formed between the worktable and the rotary table.

[0006] To achieve the above objectives, embodiments of the present invention provide a heavy-duty press rotary table, comprising: a support platform; a rotary table rotatably connected to the upper surface of the support platform; the upper surface of the support platform is provided with a first annular groove, and the lower surface of the rotary table is provided with a second annular groove, the first annular groove and the second annular groove forming an installation space, the installation space containing a heavy-duty rolling element; a worktable matching and fitting the upper surface of the rotary table, the rotary table and the worktable being detachably connected, the detachable connection being used to block the temperature transfer path of the workpiece to be processed within the rotary table; the heavy-duty rolling element supports the rotary table and the worktable, enabling the rotary table to rotate coaxially relative to the support platform.

[0007] Preferably, the upper surface of the support platform is provided with a first annular groove, and the lower surface of the rotary table is provided with a second annular groove. The first annular groove and the second annular groove enclose an installation space. The rolling support is disposed in the installation space. The rolling support includes a base located in the first annular groove and a top seat located in the second annular groove. The upper surface of the base is provided with a third annular groove, and the lower surface of the top seat is provided with a fourth annular groove. The third annular groove and the fourth annular groove enclose a rolling space. The heavy-duty rolling element is disposed in the rolling space. The heavy-duty rolling element includes a plurality of first balls and a plurality of second balls. The diameter of the first balls is larger than the diameter of the second balls. Two adjacent first balls are distributed along the circumferential gap of the third annular groove. Two second balls are disposed between two adjacent first balls. The two second balls are respectively located on opposite sides of the first balls along the radial direction of the third annular groove.

[0008] Preferably, the first annular groove is provided with a plurality of elastic support members that provide support for the base. The elastic support member includes a support plate connected to the base, a support shaft located below the support plate, and an elastic member sleeved on the support shaft. The elastic member is used to provide a first upward pre-tightening thrust to the base. The elastic support member also includes an energy storage hydraulic cylinder, which is spaced apart from the elastic member. The piston rod of the energy storage hydraulic cylinder is tractively connected to the base. The surface of the base that contacts the piston rod is provided with a pressure sensor array. The energy storage hydraulic cylinder is used to provide a second upward pre-tightening thrust to the base.

[0009] Preferably, the top seat has a positioning step on the side facing the base, and the base has a stepped groove on the side facing the top seat. The positioning step extends into the stepped groove and is in clearance fit with the stepped groove. The third annular groove is located on the bottom surface of the stepped groove, and the central angle corresponding to the third annular groove is less than 180º. The fourth annular groove is located on the positioning step, and the cross-section of the fourth annular groove is U-shaped. The distance between the bottom of the fourth annular groove and the bottom of the third annular groove is equal to the diameter of the first ball.

[0010] Preferably, the rotary table is provided with an oil injection hole, and the upper surface of the top seat is provided with an annular oil injection groove coaxial with the top seat. The oil injection hole communicates with the annular oil injection groove. The top seat is also provided with a plurality of oil inlet holes communicating with the annular oil injection groove and the third annular groove. The cross-section of the annular oil injection groove is arc-shaped. Along the direction from the end of the annular oil injection groove near the oil injection hole to the farthest end from the oil injection hole, the height of the inlet of the oil inlet gradually decreases. The inlet of the oil inlet farthest from the oil injection hole is located at the bottom end of the annular oil injection groove. The oil injection hole is an oblique hole or an L-shaped hole.

[0011] Preferably, the outer surface of the rotary table is provided with an external gear ring, which meshes with multiple drive gears. The multiple drive gears rotate actively to drive the external gear ring to rotate. The multiple drive gears are evenly distributed along the circumference of the external gear ring. The drive gears are bevel gears, and the external gear ring is a bevel gear ring that meshes with the bevel gears. The bevel gears are located below the external gear ring, and a support structure is also provided below the bevel gears. The support structure includes a support rod fixed relative to the support platform and a driven bevel gear rotatably mounted on the support rod. The driven bevel gear meshes with the drive gears. An atomizing nozzle pointing towards the upper surface of the drive gear is provided on the support rod. The atomizing nozzle is connected to an oil supply system through a pipe, and the oil supply system is used to provide lubricating oil to the atomizing nozzle.

[0012] Preferably, a heat insulation structure and / or heat insulation material is provided between the worktable and the rotary table; the heat insulation structure includes a heat insulation protrusion on one of the worktable and the rotary table, the heat insulation protrusion being designed as at least a spherical surface, and a heat insulation groove adapted to the heat insulation protrusion is provided on the other of the worktable and the rotary table, the heat insulation protrusion and the heat insulation groove cooperating to form a heat insulation gap between the worktable and the rotary table, and the heat insulation structure further includes a reflective layer disposed within the heat insulation gap; the heat insulation protrusion... A buffer pad is provided on the outer side of the worktable, which is elastically connected between the worktable and the rotary table. A second positioning hole is provided at the center of the rotary table, and a second positioning protrusion is provided at the center of the worktable to cooperate with the second positioning hole. The second positioning protrusion is at least part of a sphere, and at least part of the second positioning hole is a spherical surface adapted to the second positioning protrusion. A disc spring is sleeved on the second positioning protrusion. An annular heat-insulating baffle is provided on the lower surface of the worktable, and the heat-insulating protrusion is located within the range enclosed by the heat-insulating baffle.

[0013] Preferably, the rotary table is driven by a lifting mechanism, which provides upward static pressure to the rotary table. The lifting mechanism includes multiple energy-storing servo hydraulic cylinders, the piston rods of which are driven by the rotary table. The piston rods are parallel to the axis of the rotary table. A roller is provided at the end of the piston rod that contacts the rotary table. A pressure equalizing plate is provided at the bottom of the rotary table and is wavy in shape, which is rolled and connected to the roller. An annular limiting groove adapted to the pressure equalizing plate is provided on the rotary table.

[0014] Preferably, the support platform is provided with a first positioning hole, and the rotary table is provided with a first positioning protrusion that cooperates with the first positioning hole; a sleeve is fitted on the first positioning protrusion; along the axial direction of the sleeve, the sleeve is wavy, and the sleeve forms multiple annular wavy grooves, and an elastic sealing ring is provided in the wavy grooves.

[0015] Preferably, the worktable is provided with at least three centering hydraulic cylinders, the piston rods of the centering hydraulic cylinders are arranged radially along the worktable, and the piston rods of the centering hydraulic cylinders are provided with rotatable centering rollers. The circumferential side surfaces of the centering rollers are regular polygonal prisms, and the circumferential side surfaces of the centering rollers are rounded. The worktable is provided with a plurality of limiting structures for limiting the piston rods of the centering hydraulic cylinders. The limiting structure includes at least two limiting blocks provided on opposite sides of the piston rods. The limiting blocks are provided with arc-shaped grooves adapted to the piston rods. The arc-shaped grooves are provided with cleaning structures at both ends along the axial direction. The cleaning structures are elastically connected to the piston rods, and the arc-shaped grooves are clearance-fitted with the piston rods.

[0016] The present invention has at least the following technical effects through the technical solution provided by the present invention:

[0017] By designing the worktable and rotary table as separate structures, when the worktable is placed on the rotary table, contact thermal resistance can be formed between the worktable and the rotary table. At the microscopic level, the surfaces of the worktable and the rotary table have multiple lattices, resulting in uneven surfaces. This allows gaps to be formed between the worktable and the rotary table, and these gaps are filled with air, thereby increasing the thermal resistance between the worktable and the rotary table. This reduces the heat energy transferred from the worktable to the rotary table through heat conduction, and thus reduces the heat energy transferred to the heavy-duty rolling components. This helps to prevent the heavy-duty rolling components from becoming more plastic at high temperatures, which is beneficial for preventing deformation of the heavy-duty rolling components, extending their service life, and reducing the frequency of maintenance, repair, and replacement of the heavy-duty rolling components.

[0018] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a heavy-duty press rotary table according to some embodiments of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of a rolling support member according to some embodiments of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of a heavy-duty rolling element according to some embodiments of the present invention;

[0022] Figure 4 This is another structural schematic diagram of a heavy-duty press rotary table according to some embodiments of the present invention;

[0023] Figure 5 This is a schematic diagram of the thermal insulation structure shown in some embodiments of the present invention;

[0024] Figure 6 This is another structural schematic diagram of the rolling support member shown in some embodiments of the present invention;

[0025] Figure 7 This is a schematic diagram of the connection between the rotary table and the support platform according to some embodiments of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of a workbench according to some embodiments of the present invention;

[0027] Figure 9 This is a schematic diagram of the limiting structure according to some embodiments of the present invention.

[0028] In the diagram: 100, support platform; 110, first positioning hole; 200, rotary table; 210, heat insulation groove; 220, first positioning protrusion; 230, second positioning hole; 240, oil injection hole; 260, sleeve; 300, worktable; 310, heat insulation protrusion; 320, second positioning protrusion; 330, heat insulation flange; 340, centering hydraulic cylinder; 350, centering roller; 360, limiting structure; 370, cleaning structure; 400, rolling support. Support component; 410, base; 411, stepped groove; 420, top seat; 421, positioning step; 430, heavy-duty rolling element; 431, first ball bearing; 432, second ball bearing; 440, elastic support component; 441, support plate; 442, support shaft; 443, elastic element; 444, base plate; 450, annular oil injection groove; 460, oil inlet hole; 510, external gear ring; 520, drive gear; 530, support structure; 600, lifting mechanism. Detailed Implementation

[0029] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0030] In this invention, the terms "system" and "network" are used interchangeably. "Multiple" refers to two or more; therefore, in this invention, "multiple" can also be understood as "at least two." "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / ", unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship. Furthermore, it should be understood that in the description of this invention, terms such as "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or order.

[0031] Figure 1 This is a schematic diagram of the structure of a heavy-duty press rotary table according to some embodiments of the present invention. Figure 2 This is a schematic diagram of the structure of a rolling support member according to some embodiments of the present invention.

[0032] Please see Figure 1 This invention provides a heavy-duty press rotary worktable, including a support platform 100, a rotary table 200, and a worktable 300. The heavy-duty press rotary worktable is located below the press's punch head.

[0033] The support platform 100 serves as the mounting base for installing rotating components. The support platform 100 can be made of metal and can have various shapes, such as cylindrical, prismatic, disc-shaped, or rotary. The upper surface of the support platform 100 serves as a support surface for supporting the rotating components. As an example, the support platform 100 is designed as a rotary shape, with a maximum diameter of 1700 mm, a height of 350 mm, and a weight of 5-6 tons.

[0034] The rotary table 200 is rotatably connected to the support platform 100 and serves as a mounting base for installing the worktable 300, thereby driving the worktable 300 to rotate synchronously. In one possible embodiment, the rotary table 200 can be designed as a rotary body, and the maximum diameter of the rotary table 200 can be the same as the maximum diameter of the support platform 100. The thickness of the rotary table 200 can be the same as or similar to the thickness of the support platform 100.

[0035] In one possible implementation, the upper surfaces of the rotary table 200 and the support platform 100 are rotatably connected. A rolling support 400 is provided between the rotary table 200 and the support platform 100 to form a rolling connection between them. The rolling support 400 is used to reduce the resistance when the rotary table 200 and the support platform 100 rotate relative to each other. The rolling support 400 includes a plurality of heavy-duty rolling elements 430 that bear the weight of the rotating component. The heavy-duty rolling elements 430 provide support for the rotating component and form a rolling connection with the rotary table 200 and the support platform 100 respectively, so that the rotary table 200 and the support platform 100 can rotate relative to each other.

[0036] The worktable 300 is used to support heavy workpieces and forms a contact thermal resistance with the rotary table 200.

[0037] The worktable 300 can be used to support large heavy workpieces weighing more than 1 ton (not shown in the figure). Large heavy workpieces are usually block metal materials heated to a red-hot state. The heavy workpieces are pressed and deformed by the pressure of the press.

[0038] In one possible implementation, the upper surfaces of the worktable 300 and the rotary table 200 are fitted together. The rotary table 200 and the worktable 300 are detachably connected, which blocks the temperature transfer path of the workpiece within the rotary table 200. When the rotary table 200 rotates, friction causes the worktable 300 and the rotary table 200 to rotate synchronously. The worktable 300 and the rotary table 200 can be designed as rotating bodies to ensure uniform mass distribution along the circumference.

[0039] The worktable 300 and the rotary table 200 are designed as separate structures. When the worktable 300 is placed on the rotary table 200, a contact thermal resistance can be formed between the worktable 300 and the rotary table 200. At the microscopic level, the surfaces of the worktable 300 and the rotary table 200 have multiple lattices, resulting in uneven surfaces. This allows gaps to be formed between the worktable 300 and the rotary table 200, and these gaps are filled with air. This increases the thermal resistance between the worktable 300 and the rotary table 200, reducing the heat energy transferred from the worktable 300 to the rotary table 200 through heat conduction. Consequently, the heat energy transferred to the heavy-duty rolling element 430 is reduced, thus preventing the heavy-duty rolling element 430 from increasing plasticity at high temperatures. This helps prevent the heavy-duty rolling element 430 from deforming, extends its service life, and reduces the frequency of maintenance, repair, and replacement of the heavy-duty rolling element 430.

[0040] The worktable 300 and rotary table 200 are designed as separate structures, and the worktable 300 can be replaced as needed to accommodate heavy workpieces of different sizes, which helps to expand the application range of the rotary worktable of heavy presses.

[0041] In one possible implementation, a lifting structure can be provided on the workbench 300 to facilitate the use of lifting machinery for installation, replacement, maintenance, or other operations. The lifting structure may include at least one of the following: a buckle, a slot, or a connecting column that mates with a hook. The connecting column may include a columnar structure arranged radially along the workbench 300, and may have holes, slots, or limiting steps that mate with the hook. The lifting structure can be distributed circumferentially along the outer surface of the workbench 300. The lifting structure can employ existing technology; its specific structure and working principle are not considered improvements in this solution and will not be elaborated here.

[0042] In one possible implementation, the upper surface of the support platform 100 is provided with a first annular groove, and the lower surface of the rotary table 200 is provided with a second annular groove. The first annular groove and the second annular groove enclose and form an installation space, and the rolling support 400 is provided in the installation space.

[0043] In one possible implementation, such as Figure 2 As shown, the rolling support 400 includes a base 410 located in a first annular groove and a top seat 420 located in a second annular groove. The upper surface of the base 410 is provided with a third annular groove, and the lower surface of the top seat 420 is provided with a fourth annular groove. The third annular groove and the fourth annular groove enclose a rolling space, and the heavy-duty rolling element 430 is disposed in the rolling space.

[0044] The heavy-duty rolling element 430 can bear pressure and create a gap between the base 410 and the top seat 420. When torque is applied to the rotary table 200, the heavy-duty rolling element 430 can form a rolling connection with the base 410 and the top seat 420 respectively, allowing the rotary table 200 to rotate relative to the support platform 100. In one possible embodiment, the rotary table 200 and the support platform 100 can be clearance-fitted, and the width of the gap can be controlled by the dimensions of the heavy-duty rolling element 430.

[0045] The first, second, third, and fourth annular grooves can be coaxially arranged and collinear with the rotation center line of the rotary table 200.

[0046] In one possible implementation, the cross-sections of the third and fourth annular grooves can have various shapes, such as at least one of C-shape, U-shape, rectangle, and V-shape. Their specific shapes can also be set according to actual needs. The third and fourth annular grooves can respectively conform to the heavy-duty rolling element 430, or a certain gap can be reserved.

[0047] The base 410 and the support platform 100, and the top seat 420 and the rotary table 200 can be connected in various ways, such as snap-fit, threaded connection, etc.

[0048] In actual use, the heavy-duty rolling element 430 needs to form rolling friction with the top seat 420 and the base 410 to reduce the resistance when the rotary table 200 rotates relative to the support table 100. If all the heavy-duty rolling elements 430 are in close contact, it will increase the wear between the heavy-duty rolling elements 430. Furthermore, due to the machining errors between the heavy-duty rolling elements 430, it is difficult for multiple heavy-duty rolling elements 430 to be neatly arranged in the third annular groove. The distance between the heavy-duty rolling elements 430 and the center of the third annular groove may have a certain deviation, resulting in a certain deviation in the radial and axial directions of multiple heavy-duty rolling elements 430 in the third annular groove. This will cause multiple heavy-duty rolling elements 430 to be unable to contact the top seat 420 at the same time. When the top seat 420 and the base 410 rotate relative to each other, some heavy-duty rolling elements 430 may fail due to lack of load, while some heavy-duty rolling elements 430 may be overloaded and experience accelerated wear. Meanwhile, when the heavy-duty rolling element 43 expands due to heat, the heavy-duty rolling element 430 does not have sufficient space to accommodate the thermal expansion deformation, which will further aggravate the wear of the heavy-duty rolling element 430. If the gaps between the heavy-duty rolling elements 430 are distributed, under impact, the heavy-duty rolling elements 430 are prone to circumferential movement and cluster together, resulting in uneven distribution of the supported area of ​​the top seat 420, which in turn can easily cause the rotary table to deflect. At the same time, the heavy-duty rolling elements 430 are also prone to frequent collisions, generating noise. If limiting grooves are set on the top seat 420 and the base 410 to limit the position of each heavy-duty rolling element 430, it will increase the processing difficulty and processing cost of the top seat 420 and the base 410.

[0049] Figure 3 This is a schematic diagram of the structure of a heavy-duty rolling element according to some embodiments of the present invention.

[0050] In one possible implementation, such as Figure 3 As shown, the heavy-duty rolling element 430 includes a plurality of first balls 431 and a plurality of second balls 432. The diameter of the first balls 431 is larger than the diameter of the second balls 432. Two adjacent first balls 431 are distributed along the circumferential gap of the third annular groove. Two second balls 432 are provided between two adjacent first balls 431. The two second balls 432 are respectively located on opposite sides of the first balls 431 along the radial direction of the third annular groove.

[0051] The first ball bearing 431 is used to support the weight of the rotating component. The top of the first ball bearing 431 is in rolling connection with the top seat 420, and the bottom of the first ball bearing 431 is in rolling connection with the base 410.

[0052] The second ball bearing 432 fills the gap between two adjacent first balls 431 and the base 410, forming a gap between the two adjacent first balls 431 to prevent direct contact and wear. The second ball bearing 432 also helps maintain the relative positional accuracy of the two adjacent first balls 431. In one possible implementation, the second ball bearing 432 can form a clearance fit with the two adjacent first balls 431, allowing for a certain amount of play between them. This accommodates dimensional deviations caused by machining errors, thermal expansion, etc., reducing friction and wear between the second ball bearing 432 and the first balls 431, and preventing them from jamming and becoming difficult to rotate. The size of the gap is a preset value, such as 0.2mm, 0.5mm, 1mm, or other values, and the specific value can be set according to actual needs.

[0053] In actual use, the first ball 431 can contact up to four second balls 432 at the same time. An oil storage gap can be formed between the first ball 431 and the four second balls 432. When the four second balls 432 rotate, they can drive the lubricating oil to rotate and then adhere to the first ball 431. The four second balls 432 can increase the amount of lubricating oil carried each time and adhere the lubricating oil to the first ball 431 from multiple directions, which is beneficial to improve the efficiency of lubricating oil adhering to the first ball 431 and increase the lubrication performance of the first ball 431.

[0054] The second ball 432 can also radially limit the first ball 431. When the rotary table 200 is subjected to radial load, the load is transmitted to the top seat 420 and further to the corresponding first ball 431. The first ball 431 can radially press the corresponding second ball 432. The second ball 432 is used to limit the radial movement of the first ball 431, preventing the first ball 431 from shifting laterally or wearing unevenly at the edge. The second ball 432 and the first ball 431 are in rolling contact. The limiting process does not hinder the rotary rolling, suppresses the second ball 432 from causing disorder in the arrangement of the first ball 431, and improves the radial impact resistance and positioning stability of the first ball 431.

[0055] As an example only, the assembly method of the rolling support 400 is as follows: First, the base 410 is fixed to the first annular groove of the support platform 100 by snap-fit ​​or bolts, with the third annular groove on the upper surface of the base 410 facing upwards; Second, the first ball bearing 431 and the second ball bearing 432 are placed sequentially along the circumference of the third annular groove, with the gap between the first ball bearing 431 and the second ball bearing 432 being evenly distributed; Third, the top seat 420 is hoisted above the second annular groove of the rotary table 200, so that the fourth annular groove of the top seat 420 is aligned with the third annular groove of the base 410, and then slowly lowered until they are completely in contact; Fourth, the top seat 420 is fixed to the second annular groove by positioning pins and bolts, so that the third annular groove and the fourth annular groove enclose a closed rolling space, with the first ball bearing 431 and the second ball bearing 432 located within the rolling space.

[0056] Due to factors such as machining errors, assembly errors, and wear, there may be certain assembly errors between the base 410 and the top seat 420. This may result in problems such as excessive installation gaps or excessively tight installation of the heavy-duty rolling parts 430 at different positions. Consequently, the heavy-duty rolling parts 430 at different positions may experience varying degrees of wear, affecting the overall shape accuracy of the rolling support 400. Furthermore, it may cause jamming at certain positions of the rolling support 400, leading to accelerated wear.

[0057] In one possible implementation, such as Figure 2 As shown, the first annular groove is provided with a plurality of elastic support members 440 that provide support for the base 410. Each elastic support member 440 includes a support plate 441 connected to the base 410, a support shaft 442 located below the support plate 441, and an elastic member 443 sleeved on the support shaft 442. The elastic member 443 is used to provide an upward preloaded first thrust to the base 410.

[0058] The elastic element 443 is connected between the support plate 441 and the bottom surface of the first annular groove, and is used to provide an upward elastic thrust to the support plate 441. The support shaft 442 can be used to restrict a certain degree of freedom of the elastic element 443, guide the direction of the elastic force, and prevent the elastic element 443 from deflecting and becoming loose from the support plate 441.

[0059] A certain gap is reserved between the support shaft 442 and the bottom surface of the first annular groove to provide sufficient space for the movement of the support shaft 442. The support plate 441 can be used to increase the effective area supported by the base 410. Multiple elastic support members 440 can be evenly distributed along the circumference of the first annular groove to provide support for different positions of the base 410. Under the synergistic action of multiple elastic support members 440, the base 410 can adaptively deform to eliminate the relative positional deviation between the base 410 and the top seat 420 caused by factors such as processing errors, assembly errors, and wear, so that the heavy-duty rolling members 430 at different positions can be subjected to uniform force.

[0060] The elastic support 440 is a preset value, such as six, eight, ten or other quantities, and its specific quantity can be set according to actual needs.

[0061] In one possible implementation, a base plate 444 may also be provided below the support plate 441, and an elastic element 443 is disposed between the support plate 441 and the base plate 444. The base plate 444 is provided with a guide hole adapted to the support shaft 442. At least a portion of the support shaft 442 can extend into the guide hole and slide in connection with the guide hole. By utilizing the cooperation between the guide hole and the support shaft 442, the radial movement freedom of the support shaft 442 can be restricted, thereby guiding the support shaft 442 to move along its axial direction. This facilitates guiding the direction of the elasticity applied by the elastic element 443 to the base to be perpendicular to the lower surface of the base 410, which is beneficial for the base 410 to be evenly stressed at different positions.

[0062] When the rotary table 200 deviates from the support table 100 due to factors such as machining error, assembly error, and uneven mass distribution, the rotary table 200 can press the heavy-duty rolling element 430 on the lower side. The heavy-duty rolling element 430 can press the base 410 downward, causing the elastic element 443 to adapt to elastic deformation. This avoids static friction between the heavy-duty rolling element 430 and the base 410, which can cause wear or deformation. This helps protect the safety of the heavy-duty rolling element 430 and extend its service life.

[0063] The elastic element 443 for heavy workpieces can adopt various structures, such as springs, disc springs, etc.

[0064] In one possible implementation, the elastic support 440 may further include an energy storage hydraulic cylinder (not shown in the figure), which is spaced apart from the elastic member 443. The piston rod of the energy storage hydraulic cylinder is connected to the base 410 in a transmission manner. The surface of the base 410 in contact with the piston rod is provided with a pressure sensor array. The energy storage hydraulic cylinder is used to provide a second thrust for upward pre-tightening of the base 410.

[0065] The accumulator hydraulic cylinder has a cylinder body and an accumulator chamber connected to the oil chamber within the cylinder body. After the hydraulic pump delivers hydraulic oil to the oil chamber of the cylinder body to control the piston rod to its position, hydraulic oil can continue to be pumped into the accumulator chamber to store hydraulic energy. After the hydraulic pump is shut off, the accumulator chamber maintains pressure on the piston rod, ensuring its positional accuracy. When the piston rod is subjected to impact, the pressure is transmitted to the accumulator chamber via hydraulic oil, which acts as a buffer and absorbs vibration. When the pressure on the piston rod decreases, the hydraulic oil in the accumulator chamber pushes the piston rod back to its original position. The specific structure and working principle of the accumulator hydraulic cylinder are existing technologies and are not considered improvements to this solution; therefore, they will not be elaborated upon here.

[0066] The accumulator hydraulic cylinder provides a second upward preload to the base 410, which, in conjunction with the elastic element 443, provides a first upward preload to the base 410. This increases the upward preload force on the base 410, thereby enhancing its load-bearing capacity for heavy rotating components. When the base 410 is subjected to an off-center load, the downward pressure is transmitted to the elastic support. The elastic element 443, working in conjunction with the accumulator hydraulic cylinder, simultaneously acts as a buffer, enhancing the overall resistance of the elastic support to instantaneous impacts. This improves the stability and anti-tipping ability of the heavy-duty rotary table 200.

[0067] The first and second thrusts are evenly distributed along the circumference of the base 410, which can also eliminate the angular deviation between the base 410 and the top seat 420 caused by factors such as processing errors and assembly errors, as well as the gap between the base 410 and the heavy-duty rolling element 430, so that the base 410 and the heavy-duty rolling element 430 maintain good contact.

[0068] The pressure sensor array includes multiple pressure sensors arranged in an array. This array detects pressure values ​​at different locations on the contact surface between the piston rod and the base 410. Based on these pressure values, the contact condition between the piston rod and the base 410 can be determined, such as whether the contact is good, whether it is surface contact, and whether there is an angular deviation between the piston rod and the base 410. By analyzing the pressure values ​​corresponding to multiple piston rods, it is possible to determine whether the base 410 as a whole is bearing an off-center load.

[0069] Pressure sensors can be distributed in various ways, such as in a ring array, a rectangular array, or a radial array.

[0070] The pressure sensor array can be communicatively connected to the control module. The pressure data detected by the pressure sensor array can be transmitted to the control module, which then analyzes and processes the pressure data.

[0071] As an example only, multiple pressure data detected by the same pressure sensor array include a first pressure and a second pressure. The control module can compare the pressure data with a first pressure threshold and a second pressure threshold, respectively, where the first pressure threshold is less than the second pressure threshold. When the first pressure is less than the first pressure threshold and the second pressure is greater than the second pressure threshold, the control module can determine that the pressure on the side of the piston rod corresponding to the first pressure is less than the pressure on the side of the piston rod corresponding to the second pressure, and the base 410 may have an off-center load. Therefore, it can be determined that the downward pressure applied by the rotary table 200 is unevenly distributed in the circumferential direction.

[0072] As an example only, the control module can also calculate the average pressure of multiple pressure data corresponding to the same pressure sensor array, and determine the average pressure corresponding to different piston rods, and determine whether the base 410 is under off-center load based on the average pressure corresponding to multiple piston rods.

[0073] As an example only, the pressure sensor array can be a resistance strain gauge pressure sensor array, including eight pressure sensors arranged in a ring array, each pressure sensor being embedded in the surface of the base 410 that contacts the piston rod; the control module is a control module with preset first pressure threshold (e.g., 0.5 MPa), second pressure threshold (e.g., 2.0 MPa), and pressure difference threshold (e.g., 0.3 MPa); after receiving the pressure data from the pressure sensor array, the control module calculates the average pressure value in the corresponding area of ​​each accumulator hydraulic cylinder; when the difference between the average pressures of any two areas is greater than the pressure difference threshold, the control module sends a control signal to the proportional valve of the accumulator hydraulic cylinder with higher pressure to reduce the oil supply, and sends a control signal to the proportional valve of the accumulator hydraulic cylinder with lower pressure to increase the oil supply, the adjustment range being proportional to the pressure difference; when the difference between the average pressures of each area is less than the pressure difference threshold, each accumulator hydraulic cylinder maintains its current working state.

[0074] For the side with greater pressure, the control module can control the corresponding accumulator hydraulic cylinder to reduce the thrust applied to the piston rod. For the side with greater pressure, the control module can control the corresponding accumulator hydraulic cylinder to increase the thrust applied to the piston rod. This keeps the pressure between the different piston rods and the base 410 balanced. For example, keeping the pressure balanced can include the difference between the maximum average pressure and the minimum average pressure being less than a difference threshold. This allows for dynamic adjustment of the base 410 based on the downward pressure applied by the heavy-duty rotary table 200. This enables the base 410 to adapt to the slight axial position changes of the heavy-duty rolling element 430 under eccentric load, thereby preventing wear of the heavy-duty rolling element 430 due to the slight eccentric load of the heavy-duty rotary table 200.

[0075] The control module can pre-store a first pressure threshold, a second pressure threshold, and a difference threshold. The control module calculates the average pressure of the corresponding area of ​​each accumulator hydraulic cylinder based on the pressure value detected by each pressure sensor array. When the difference between any two average pressures is greater than the difference threshold, the control module sends an increase oil supply command to the accumulator hydraulic cylinder with the lower average pressure and a decrease oil supply command to the accumulator hydraulic cylinder with the higher average pressure. The adjustment range of the oil supply is proportional to the pressure difference until each average pressure difference is less than the difference threshold.

[0076] The control module can control the pump corresponding to the accumulator hydraulic cylinder based on the pressure data detected by the pressure sensor array and a preset level, such as controlling the amount of hydraulic oil pumped into the accumulator hydraulic cylinder. The preset level and the algorithm used by the control module are existing technologies, and their specific details are not considered improvements to this solution and will not be elaborated here.

[0077] By employing an energy storage hydraulic cylinder, the displacement of the base 410 under eccentric load can be passively buffered and actively adjusted. It can respond to minute positional changes of the base 410, which helps to ensure the accuracy of adjustment.

[0078] In actual use, the rotary table 200 needs to be rotated frequently to drive the worktable 300 and heavy workpieces to rotate. However, since the weight of the rotary worktable of a large press may be in the tons, the starting resistance during rotation is large, and the inertia after rotation is large, resulting in large braking resistance, which increases the difficulty of transmission and braking.

[0079] Figure 4 This is another structural schematic diagram of a heavy-duty press rotary table according to some embodiments of the present invention.

[0080] In one possible implementation, such as Figure 4 As shown, the outer surface of the rotary table 200 is provided with an external gear ring 510, which meshes with multiple drive gears 520. The multiple drive gears 520 are evenly distributed along the circumference of the external gear ring 510.

[0081] The drive gear 520 drives the external gear ring 510 to rotate. By setting multiple drive gears 520 to rotate synchronously, the driving force on the external gear ring 510 can be increased. This allows for greater driving force to counteract the starting resistance of the rotary table 200, thus enabling faster driving of the rotary table 200. Multiple drive gears 520 can rotate synchronously at the same speed, either clockwise or counterclockwise. When the drive gears 520 stop rotating synchronously, the meshing of multiple drive gears 520 with the external gear ring 510 increases the resistance experienced by the external gear ring 510, counteracting the inertial force of the rotary table 200 and improving the braking accuracy of the rotary table 200.

[0082] Multiple drive gears 520 can be driven by corresponding transmission components, which may include multiple motors and transmission chains connecting the motors and the drive gears 520. Alternatively, multiple drive gears 520 can be driven by the same transmission component, which may include a motor and a transmission chain connecting the multiple drive gears 520 to the motor. The transmission chain can drive the multiple drive gears 520 to rotate synchronously or brake. The transmission chain may include gear transmission chains, etc. In one possible implementation, the number of drive gears 520 is a preset value, such as three, four, six, or other numbers, and the specific number can be set according to actual needs. In one possible implementation, the multiple drive gears 520 can be evenly distributed along the circumference of the external gear ring 510 to ensure uniform force distribution on the external gear ring 510.

[0083] As an example only, multiple drive gears 520 are driven by corresponding geared servo motors. Each geared servo motor has a power of 15-30kW and a rated speed of 1500rpm. The geared servo motor includes a reducer connected between the drive gear 520 and the geared servo motor. The reduction ratio of the reducer can be 1:50 to 1:100. The output shaft of the reducer is coaxially and fixedly connected to the input shaft of the drive gear 520 through a coupling. The geared servo motor is electrically connected to an external control system. The control module controls the speed and direction of each geared servo motor according to a preset speed curve to achieve synchronous driving of multiple drive gears 520. The transmission chain includes a drive sprocket, a driven sprocket, and a chain. The drive sprocket is fixed on the output shaft of the reducer, and the driven sprocket is coaxially and fixedly connected to the input shaft of the drive gear 520.

[0084] By setting multiple drive gears 520, the movement freedom of the rotary table 200 along multiple radial directions can be restricted, thereby improving the coaxiality between the rotary table 200 and the support table 100. This prevents the axis of the rotary table 200 and the support table 100 from shifting, which would cause the heavy-duty rolling element 430 to bear shear force, thus protecting the safety of the heavy-duty rolling element 430.

[0085] In one possible implementation, the drive gear 520 can be a bevel gear, and the external gear ring 510 can be a bevel gear ring that meshes with the bevel gear. The bevel gear is located below the external gear ring 510. Through the meshing of the drive gear 520 and the external gear ring 510, the rotary table 200 can also be provided with upward support, maintaining the positional accuracy of the rotary table 200 and the relative positional accuracy between the rotary table 200 and the support table 100. This avoids the angular deviation between the rotary table 200 and the support table 100 in the horizontal direction caused by factors such as machining errors, assembly errors, and uneven weight distribution, thereby preventing wear between the rotary table 200 and the support table 100.

[0086] In one possible implementation, a support structure 530 is further provided below the bevel gear. The support structure 530 includes a support rod fixed relative to the support platform 100 and a driven bevel gear rotatably mounted on the support rod. The driven bevel gear meshes with the driving gear 520, providing support for the driving gear 520 and maintaining the positional accuracy of the driving gear 520. This helps to ensure that the driving gear 520 is subjected to uniform force on its upper and lower sides, preventing the driving gear 520 from being subjected to pressure from the external gear ring 510 and causing angular deviation. At the same time, it can increase the load-bearing capacity of the driving gear 520. When the downward pressure of the impact force does not coincide with the axis of the rotary table 200, resulting in heavier pressure on one side of the rotary table 200, the support provided by the driven bevel gear for the driving gear 520 can enhance the driving gear 520's ability to resist pressure and prevent the driving gear 520 from moving or deforming.

[0087] The support rod is equipped with an atomizing nozzle (not shown in the figure) pointing towards the upper surface of the drive gear 520. The atomizing nozzle is connected to an oil supply system (not shown in the figure) through a pipe. The oil supply system is used to supply lubricating oil to the atomizing nozzle.

[0088] The atomizing nozzle can spray the lubricating oil in a mist form, allowing the misted lubricating oil to wet the upper surface of the drive gear 520, thus increasing the contact area between the drive gear 520 and the lubricating oil. This ensures that the drive gear 520 receives sufficient lubricating oil and avoids problems such as dripping or splashing of liquid lubricating oil, thereby improving the utilization rate of lubricating oil and ensuring the lubrication effect of the drive gear 520.

[0089] The oil supply system may include at least a pump and an oil tank for storing lubricating oil. The pump can pump the lubricating oil in the oil tank to the atomizing nozzle. After the lubricating oil is sprayed out through the atomizing nozzle, it can form a lubricating oil mist that flies toward the drive gear 520.

[0090] The atomizing nozzle and oil supply system can adopt existing technologies. Their specific structure and working principle are not considered as improvements in this solution and will not be elaborated here.

[0091] In actual use, although the worktable 300 and the rotary table 200 adopt a split structure to effectively reduce heat conduction, the worktable 300 can still transfer heat energy to the rotary table 200 through thermal radiation, which causes the rotary table 200 to heat up, increasing the risk of the heavy-duty rolling parts 430 heating up under the action of thermal radiation and increasing plasticity.

[0092] Figure 5 This is a schematic diagram of the thermal insulation structure according to some embodiments of the present invention.

[0093] In one possible implementation, such as Figure 5As shown, a heat insulation structure and / or heat insulation material are provided between the worktable 300 and the rotary table 200.

[0094] The heat insulation structure includes a heat insulation protrusion on one of the worktable 300 and the rotary table 200. The heat insulation protrusion is designed to be at least part of a sphere. The other of the worktable 300 and the rotary table 200 is provided with a heat insulation groove that is adapted to the heat insulation protrusion. Through the cooperation between the heat insulation protrusion and the heat insulation groove, a heat insulation gap is formed between the worktable 300 and the rotary table 200. The heat insulation structure also includes a reflective layer (not shown in the figure) disposed in the heat insulation gap.

[0095] As an example only, the lower surface of the worktable 300 is provided with a heat-insulating protrusion 310, and the upper surface of the rotary table 200 is provided with a heat-insulating groove 210. At least a portion of the heat-insulating protrusion 310 can extend into the heat-insulating groove 210. The cooperation between the heat-insulating protrusion 310 and the heat-insulating groove 210 can limit the relative degrees of freedom between the worktable 300 and the rotary table 200, ensuring that the rotary table 200 can drive the worktable 300 to rotate synchronously, while preventing the worktable 300 from moving relative to the rotary table 200. This helps maintain the relative positional accuracy of the worktable 300 and the rotary table 200. By forming a heat-insulating gap, the air volume between the worktable 300 and the rotary table 200 is increased, enhancing the effect of air-blocking heat conduction and further reducing the heat transferred from the worktable 300 to the rotary table 200 through heat conduction. Simultaneously, sufficient space is provided for the reflective layer.

[0096] The reflective layer is used to reflect heat energy transferred downwards via thermal radiation. In one possible implementation, the reflective layer may cover the portion of the lower surface of the worktable 300 without heat-insulating protrusions, and / or the reflective layer may cover the portion of the upper surface of the rotary table 200 without heat-insulating grooves 210. When one reflective layer is provided, the heat energy transferred downwards from the worktable 300 via thermal radiation can be reflected upwards, thereby reducing the amount of heat energy transferred to the rotary table 200 and its area below via thermal radiation, and delaying the time it takes for heat energy to be conducted to the rotary table 200 and its area below via thermal radiation. When two reflective layers are provided, the two reflective layers can be spaced apart, and some heat energy can be repeatedly reflected between the two reflective layers, thereby further delaying the time it takes for heat energy to be conducted to the rotary table 200 and its area below via thermal radiation.

[0097] In one possible implementation, the reflective layer may have a layered structure, such as at least one of 310S austenitic stainless steel sheet, 310S austenitic stainless steel foil, Hastelloy sheet, etc.

[0098] Thermal insulation materials are used to isolate thermal radiation. The thermal insulation materials can be filled in the thermal insulation gap. The thermal insulation materials can include a variety of materials, such as at least one of nano aerogel, mullite microporous thermal insulation blocks, hollow alumina ceramic balls, etc., which can further improve the thermal insulation effect, reduce the heat energy conducted to the rotary table 200 and below through thermal radiation, and delay the conduction time.

[0099] The heat-insulating protrusion 310 is designed as at least a spherical surface, which facilitates automatic alignment between the heat-insulating protrusion 310 and the heat-insulating groove 210, thereby improving the positioning accuracy and effect of the worktable 300. In one possible embodiment, at least a portion of the side surface of the heat-insulating groove 210 can be designed as a spherical or conical surface adapted to the heat-insulating protrusion 310. This helps to increase the contact area between the heat-insulating protrusion 310 and the heat-insulating groove 210, thereby increasing the restraining effect of the heat-insulating groove 210 on the heat-insulating protrusion 310. This prevents the heat-insulating groove 210 from separating from the heat-insulating protrusion 310 under inertia, which could cause the worktable 300 to become loose or shift, thus improving the stability of the worktable 300.

[0100] In one possible implementation, the heat insulation groove 210 can communicate with the second annular groove on the lower surface of the rotary table 200, so that when the top seat 420 needs to be removed, a push rod can be inserted from the heat insulation groove 210 to push the top seat 420 outward.

[0101] In one possible implementation, a buffer pad (not shown in the figure) is provided on the outer side of the heat insulation protrusion 310, and the buffer pad (not shown in the figure) is elastically connected between the worktable 300 and the rotary table 200.

[0102] The use of a buffer pad layer avoids direct rigid contact between the heat-insulating protrusion 310 and the heat-insulating groove 210, reducing wear between them and minimizing impact during workbench 300 installation, thus preventing damage. The buffer pad layer can be made of various materials, such as spring steel or brass, to ensure its strength can support the weight of the workbench 300 and provide a certain degree of elasticity. The buffer pad layer can be designed in various shapes, such as annular or conical, to provide elastic support to the heat-insulating protrusion 310 circumferentially. Multiple buffer pad layers can adaptively deform according to the fit between the corresponding heat-insulating protrusion 310 and heat-insulating groove 210, accommodating shape deviations caused by wear, processing errors, assembly errors, etc.

[0103] In one possible implementation, a second positioning hole 230 is provided at the center of the rotary table 200, and a second positioning protrusion 320 that mates with the second positioning hole 230 is provided at the center of the worktable 300. The second positioning protrusion 320 is at least a spherical part, and at least a part of the second positioning hole 230 is a spherical surface adapted to the second positioning protrusion 320. A disc spring is sleeved on the second positioning protrusion.

[0104] The worktable 300 is positioned by the cooperation of the second positioning hole 230 and the second positioning protrusion 320. The spherical fit between the second positioning hole 230 and the second positioning protrusion 320 allows for automatic centering of the worktable 300, which helps improve the positioning accuracy of the worktable 300. In one possible embodiment, the contact area between the second positioning hole 230 and the second positioning protrusion 320 is larger than the contact area between the heat-insulating protrusion 310 and the heat-insulating groove 210. The cooperation between the second positioning hole 230 and the second positioning protrusion 320 provides main support for the second positioning protrusion 320. Multiple heat-insulating protrusions 310 and corresponding heat-insulating grooves 210 provide multiple upward supports for the worktable 300 from the circumference of the second positioning protrusion 320, which limits the deflection of the worktable 300 around its radial direction and ensures the stability of the worktable 300.

[0105] When the worktable 300 is connected to the rotary table 200, the disc spring is in a compressed state. The disc spring can provide an upward elastic support force to the worktable 300. During the installation of the worktable 300, it can apply an upward elastic force to the worktable 300 through its own elastic deformation, thereby automatically centering the worktable 300 and adjusting the level of the worktable 300, which helps to improve the installation accuracy of the worktable 300.

[0106] In one possible implementation, the lower surface of the worktable 300 is provided with an annular heat-insulating baffle 330, and the heat-insulating protrusion 310 is located within the area enclosed by the heat-insulating baffle 330. The heat-insulating baffle 330 can enclose a circular area, and when the worktable 300 is connected to the rotary table 200, the heat-insulating baffle 330 can seal the gap between the worktable 300 and the rotary table 200, preventing external impurities from entering the gap and causing wear on the buffer pad layer.

[0107] In actual use, due to the large total weight of the rotary table 200, the worktable 300 and the heavy workpiece, when the rotary table 200 and the support table 100 rotate relative to each other, the heavy-duty rolling element 430 not only has to bear the pressure from above, but also the friction between the heavy-duty rolling element 430 and the base 410 and the top seat 420. At the same time, due to the processing error of the heavy-duty rolling element 430, different heavy-duty rolling elements 430 may have certain dimensional deviations, which makes the heavy-duty rolling element 430 easy to deform to different degrees under pressure.

[0108] In one possible implementation, such as Figure 4 As shown, the rotary table 200 is connected to a lifting mechanism 600, which provides upward static pressure to the rotary table 200.

[0109] The lifting mechanism 600 provides upward static pressure to the rotary table 200, which can share the pressure borne by the heavy-duty rolling element 430, and prevent the heavy-duty rolling element 430 from being easily deformed due to long-term operation under high pressure. When the rotary table 200 rotates, it can also reduce the wear of the heavy-duty rolling element 430, which is conducive to extending the service life of the heavy-duty rolling element 430.

[0110] In one possible implementation, the lifting mechanism 600 can provide multiple support points for the rotary table 200. These support points can be evenly distributed around the rotation center line of the rotary table 200 to ensure uniform force distribution on the rotary table 200 and prevent excessive pressure on one side of the rotary table 200, which could cause it to deflect. The number of support points is a preset value, such as three, four, six, or other numbers, and the specific number can be set according to actual needs.

[0111] After the lifting mechanism 600 applies a thrust to the rotary table 200, under the action of the elastic element 443, the base 410 can adaptively adjust its height so that the base 410 and the top seat 420 keep clamping the heavy-duty rolling element 430, preventing the heavy-duty rolling element 430 from separating from the top seat 420 and ensuring the performance of the heavy-duty rolling element 430.

[0112] In one possible implementation, the lifting mechanism 600 includes a plurality of energy storage servo hydraulic cylinders, the piston rods of the plurality of energy storage servo hydraulic cylinders are connected to the rotary table 200 in a transmission manner, the piston rods are parallel to the axis of the rotary table 200, a roller is provided at one end of the piston rod that contacts the rotary table, a pressure equalization plate is provided at the bottom of the rotary table 200 that is tumblingly connected to the roller, the pressure equalization plate is wavy, and an annular limiting groove adapted to the pressure equalization plate is provided on the rotary table 200.

[0113] The control precision of the energy-storing servo hydraulic cylinder can reach within 0.1mm, thus accurately controlling the piston rod stroke. This ensures that when the lifting mechanism 600 provides support in contact with the rotary table 200, the heavy-duty rolling element 430 can also maintain good contact with the top seat 420, preventing excessive lifting of the rotary table 200 and subsequent failure of the heavy-duty rolling element 430. The energy-storing servo hydraulic cylinder also acts as an elastic element, providing upward elastic support for the rotary table 200. The relative position of the rotary table 200 and the support platform 100 can be adjusted by regulating the extension and retraction length of the piston rod, ensuring the accuracy of their relative position. Simultaneously, it can share some of the load on the heavy-duty rolling element 430, reducing the pressure on it and thus minimizing wear. The energy-storing servo hydraulic cylinder can utilize existing technology; its specific structure and working principle are not considered improvements in this solution and will not be elaborated upon here.

[0114] Due to minor manufacturing, assembly, and control stroke deviations that may exist in multiple energy-storing servo hydraulic cylinders, the extension height of each roller is difficult to be completely consistent. By employing a corrugated pressure equalizing plate, when the rollers apply pressure to the pressure equalizing plate, the plate can adaptively deform, redistributing the point load formed between multiple piston rods and rollers. This avoids single-point overload on individual rollers and unloaded load on other rollers, enabling multiple energy-storing servo hydraulic cylinders to synchronously share the lifting load and preventing the rotary table 200 from deflecting due to deflection.

[0115] In one possible implementation, the pressure equalizing plate is arranged in a wavy shape along the radial direction. When the roller applies pressure to the pressure equalizing plate, the roller can deform radially, thereby dispersing the upward thrust applied by the roller to the pressure equalizing plate radially. This increases the effective range of radial support for the rotary table 200 and avoids radial deviations between multiple force points of the rotary table 200 and the roller due to manufacturing errors, assembly errors, and control stroke deviations. This prevents the rotary table from being subjected to eccentric loads and deflecting.

[0116] By setting an annular limiting groove, the pressure equalizing plate can be limited to prevent it from shifting radially along the rotary table.

[0117] In one possible implementation, a pressure sensor can be installed between the pressure equalizing plate and the piston rod of the energy storage servo hydraulic cylinder. The pressure sensor detects the pressure between the pressure equalizing plate and the piston rod in real time. The control module can adjust the stroke of the piston rod of the energy storage servo hydraulic cylinder based on a preset program and the pressure detected by the pressure sensor. This facilitates automated control of the pressure applied to the pressure equalizing plate by the piston rod of the energy storage servo hydraulic cylinder, ensuring that the height difference between the ends of multiple piston rods is no greater than 0.1 mm. The preset program consists of preset values ​​that can be set according to actual needs, and will not be elaborated further here.

[0118] In one possible implementation, multiple mounting holes can be provided within the support platform 100, and the energy storage servo hydraulic cylinder can be installed in the corresponding mounting holes. This allows the energy storage servo hydraulic cylinder to avoid structures such as the external gear ring 510, and provides protection for the energy storage servo hydraulic cylinder. Simultaneously, the radius of the virtual ring surrounding the multiple support points provided by the energy storage servo hydraulic cylinder is smaller than the radius of the third annular groove. When there is a risk of deflection of the rotary table 200, the pressure of the rotary table 200 is first borne by the energy storage servo hydraulic cylinder. The hydraulic system corresponding to the energy storage servo hydraulic cylinder can control the flow of hydraulic oil within the energy storage servo hydraulic cylinder to adjust the thrust applied by the energy storage servo hydraulic cylinder to the rotary table 200, thereby adapting to the angle changes of the rotary table 200. This shares some of the pressure with the heavy-duty rolling element 430, preventing the heavy-duty rolling element 430 from deforming or being damaged under pressure.

[0119] By setting rollers, dynamic friction can be generated between the rollers and the rotary table 200, thereby reducing wear and the resistance when the rotary table 200 rotates.

[0120] When a heavy workpiece is placed on the worktable 300, and the stamping head performs stamping or hydrostatic processing on the heavy workpiece, the pressure direction of the stamping head may not coincide with the axis of the rotary table 200 depending on the placement position of the heavy workpiece and the process requirements. This results in greater pressure on one side of the rotary table 200, causing the rotary table 200 to deflect to a certain extent.

[0121] The lifting mechanism 600 may also include multiple pressure detection units to detect the pressure applied by the rotary table 200 to the structure below in real time. For example, multiple pressure detection units may be distributed between the support platform 100 and the rotary table 200, or multiple pressure detection units may be set on the corresponding piston rod, or between the top seat 420 and the base 410. The pressure unit may correspond to the energy storage servo hydraulic cylinder. When the pressure change detected by a certain pressure detection unit meets the preset conditions, the hydraulic system can supply oil to the corresponding energy storage servo hydraulic cylinder to increase the upward thrust that the energy storage servo hydraulic cylinder can provide, thereby counteracting the pressure applied by the stamping head and preventing the rotary table 200 from deflecting under the pressure of the stamping head, which could lead to deformation or wear of the heavy-duty rolling parts 430 and wear of the rotary table 200.

[0122] In one possible implementation, the hydraulic system may include a control module for collecting, analyzing, and processing data, and controlling other structures based on a preset program. The control module may include various components, such as a processor, microprocessor, controller, or cloud server. The control module can communicate with a pressure detection unit to receive pressure data detected by the unit, analyze and process the pressure data based on a preset program, and control the accumulator servo hydraulic cylinder according to the processing results. The hydraulic system may also include inlet and outlet oil lines connected to the accumulator servo hydraulic cylinder, solenoid valves and pumps located on these lines, and the control module can communicate with the solenoid valves and pumps to automate their control, thereby controlling the oil inflow or outflow of the accumulator servo hydraulic cylinder.

[0123] The hydraulic system and preset programs are existing technologies, and their specific details, structure, and working principles are not considered improvements to this solution and will not be elaborated upon here. The preset conditions are preset values ​​that can be set according to actual needs.

[0124] Figure 6 This is another structural schematic diagram of a rolling support member according to some embodiments of the present invention.

[0125] In one possible implementation, such as Figure 6 As shown, the top seat 420 has a positioning step 421 on the side facing the base 410, and the base 410 has a stepped groove 411 on the side facing the top seat 420. The positioning step 421 extends into the stepped groove 411 and is in clearance fit with the stepped groove 411. A third annular groove is provided on the bottom surface of the stepped groove 411, and the central angle corresponding to the third annular groove is less than 180º. A fourth annular groove is provided on the positioning step 421. The cross-section of the fourth annular groove is U-shaped, and the distance between the bottom of the fourth annular groove and the bottom of the third annular groove is equal to the diameter of the heavy-duty rolling element 430.

[0126] By utilizing the cooperation between the stepped groove 411 and the positioning step 421, the relative radial movement freedom of the top seat 420 and the base 410 can be restricted. When the top seat 420 and the base 410 move relative to each other in the radial direction, the positioning step 421 can be prevented from disengaging from the stepped groove 411, thereby restricting the relative radial movement of the rotary table 200 and the support table 100. At the same time, it can prevent the top seat 420 and the base 410 from applying shear force to the heavy-duty rolling element 430, which is beneficial to protecting the safety of the heavy-duty rolling element 430 and extending its service life.

[0127] In one possible implementation, the second ball 432 is located inside the portion of the fourth annular groove that extends into the stepped groove 411 and fills the space between the first ball 431 and the inner wall of the fourth annular groove. The second ball 432 radially limits the first ball 431 to prevent the first ball 431 from colliding with or wearing against the inner wall of the fourth annular groove.

[0128] In one possible implementation, such as Figure 2 As shown, the rotary table 200 is provided with an oil injection hole 240, and the upper surface of the top seat 420 is provided with an annular oil injection groove 450 coaxial with the top seat 420. The oil injection hole 240 is connected to the annular oil injection groove 450. The top seat 420 is also provided with multiple oil inlet holes 460 connecting the annular oil injection groove 450 and the third annular groove. The cross-section of the annular oil injection groove 450 is arc-shaped. Along the direction from the end of the annular oil injection groove 450 near the oil injection hole 240 to the farthest end from the oil injection hole 240, the height of the inlet of the oil inlet hole 460 gradually decreases. The inlet of the oil inlet hole 460 farthest from the oil injection hole 240 is located at the bottom of the annular oil injection groove 450.

[0129] Lubricating oil can be added to the annular oil filling groove 450 through the oil filling hole 240. The lubricating oil can flow along the annular oil filling groove 450. The thickness of the lubricating oil in the annular oil filling groove 450 is inversely proportional to the distance from the oil filling hole 240. That is, the farther away from the oil filling hole 240, the lower the thickness of the lubricating oil in the annular oil filling groove 450. By designing the inlet height of the oil inlet hole 460 to be different, lubricating oil can flow into the oil inlet hole 460 at all points in the annular oil filling groove 450. This avoids the lubricating oil flow channel formed by the annular oil filling groove 450 being too long, which would prevent the lubricating oil from entering the third annular groove through the oil inlet hole 460 farthest from the oil filling hole 240. This can save the need to open additional oil filling holes 240, reduce the machining difficulty of the rotary table 200, and at the same time avoid the strength of the rotary table 200 being reduced due to the opening of multiple oil filling holes 240. Connecting the oil injection hole 240 to the annular oil injection groove 450 can also eliminate the need for additional positioning structures, avoiding increased positioning requirements between the rotary table 200 and the top seat 420, as well as increased positioning difficulty and cost.

[0130] In one possible implementation, the depth of the annular oil filling groove 450 may also gradually increase along the direction away from the oil filling hole 240, so that the lubricating oil in the annular oil filling groove 450 can flow to a lower position and flow from different oil filling holes 240 into the fourth annular groove, so as to lubricate the multiple heavy-duty rolling elements 430.

[0131] In one possible implementation, the oil injection hole 240 is an oblique hole or an L-shape, thereby facilitating the flow of lubricating oil from the oil injection hole 240 into the annular oil injection groove 450 and reducing lubricating oil backflow that could lead to leakage. In another possible implementation, a plunger can be provided at the inlet of the oil injection hole 240 to seal the oil injection hole 240, preventing external impurities from entering the lubricating oil through the oil injection hole 240 and causing wear between the impurities and the heavy-duty rolling element 430.

[0132] By setting the stepped groove 411, the stepped groove 411 can also be used to contain lubricating oil. The oil inlet 460 can be pointed to the stepped groove 411 so that the lubricating oil can be directly guided into the stepped groove 411 to avoid lubricating oil leakage.

[0133] Figure 7 This is a schematic diagram of the connection between the rotary table and the support platform according to some embodiments of the present invention.

[0134] In one possible implementation, such as Figure 7 As shown, the support platform 100 is provided with a first positioning hole 110, and the rotary table 200 is provided with a first positioning protrusion 220 that cooperates with the first positioning hole 110; a sleeve 260 is fitted on the first positioning protrusion 220.

[0135] Along the axial direction of the sleeve 260, the sleeve 260 is wavy, forming multiple annular wavy grooves, and elastic sealing rings (not shown in the figure) are provided in the wavy grooves.

[0136] By utilizing the cooperation between the first positioning hole and the first positioning protrusion, the support platform 100 and the rotary table 200 can be radially positioned and limited, thereby improving the positioning accuracy of the support platform 100 and the rotary table 200, as well as the relative position accuracy of the support platform 100 and the rotary table 200 in the radial direction. This avoids the situation where the rotary component as a whole is eccentric with the support platform 100 due to the relative position of the support platform 100 and the rotary table 200 in the radial direction, and avoids the centrifugal force that occurs when the rotary component rotates due to the eccentricity between the rotary component as a whole and the support platform 100.

[0137] By using sleeve 260, direct contact between the first positioning hole 110 and the first positioning protrusion 220 can be avoided, preventing wear. It also prevents gaps between the first positioning hole 110 and the first positioning protrusion 220, thus avoiding radial displacement between the support platform 100 and the rotary table 200. The sleeve 260 is designed with a wave shape, giving it a certain degree of elasticity. This allows the sleeve 260 to adapt to deformation under pressure, enhancing its applicability. Simultaneously, it provides sufficient space for deformation of the support platform 100 and the rotary table 200 during thermal expansion. The use of an elastic sealing ring enhances the sealing performance between the first positioning hole 110 and the first positioning protrusion 220.

[0138] In one possible implementation, the sleeve 260 is provided with a plurality of grooves arranged along the axial direction. The openings of the grooves are staggered at both ends of the sleeve 260. Along the axial direction of the sleeve 260, the length of the groove can be greater than 75% of the length of the sleeve 260. When the sleeve 260 is thermally expanded or deformed by compression, the grooves can be used to reserve space for the circumferential deformation of the sleeve 260.

[0139] In actual use, heavy workpieces can be stamped or hydrostatically processed after being placed on the worktable 300. However, heavy workpieces are generally large in size. If the center of gravity of the heavy workpiece and the worktable 300 is not aligned, the center of gravity of the heavy workpiece, the worktable 300 and the rotary table 200 as a whole may shift, resulting in uneven mass distribution of the heavy workpiece, the worktable 300 and the rotary table 200 as a whole. When the rotary table 200 rotates, it may tilt, causing the wear of the heavy-duty rolling element 430 on one side to accelerate, which seriously affects the service life of the heavy-duty rolling element 430.

[0140] Figure 8 This is a schematic diagram of the structure of a workbench according to some embodiments of the present invention. Figure 9 This is a schematic diagram of the limiting structure according to some embodiments of the present invention.

[0141] In one possible implementation, such as Figure 8 , Figure 9 As shown, the worktable 300 is provided with at least three centering hydraulic cylinders 340. The piston rod of the centering hydraulic cylinder 340 is arranged radially along the worktable 300. The piston rod of the centering hydraulic cylinder 340 is provided with a rotatable centering roller 350. The circumferential side of the centering roller 350 is a regular polygonal prism, and the circumferential side of the centering roller 350 adopts a rounded transition.

[0142] The worktable 300 is provided with multiple limiting structures 360 for limiting the piston rod of the centering hydraulic cylinder 340. Each limiting structure 360 ​​includes at least two limiting blocks located on opposite sides of the piston rod. Each limiting block has an arc-shaped groove adapted to the piston rod. Cleaning structures 370 are provided at both ends of the arc-shaped groove along the axial direction. The cleaning structures 370 are elastically connected to the piston rod, and the arc-shaped groove is clearance-fitted with the piston rod.

[0143] The piston rod of the centering hydraulic cylinder 340 can apply a thrust to the heavy workpiece, thereby changing the relative position of the heavy workpiece and the worktable 300.

[0144] For heavy workpieces with a rotating shape, when the piston rods of multiple centering hydraulic cylinders 340 move synchronously, they can apply thrust to the heavy workpiece from multiple directions. Depending on the relative position of the heavy workpiece and the worktable 300, different positions of the heavy workpiece can successively contact multiple centering rollers 350 to be pushed by the piston rods of the centering hydraulic cylinders 340 and thus displaced, until the heavy workpiece simultaneously contacts multiple centering rollers 350. Since the piston rods of multiple centering hydraulic cylinders 340 move synchronously, they can push the heavy workpiece to coincide with the center of gravity of the worktable 300 to achieve centering. This keeps the center of gravity of the heavy workpiece and the worktable 300 on the same vertical line, which is beneficial to keep the center of gravity of the heavy workpiece, the worktable 300 and the rotary table 200 as a whole on the same vertical line. This makes the mass distribution of the heavy workpiece, the worktable 300 and the rotary table 200 as a whole uniform. When the rotary table 200 rotates, it avoids uneven mass distribution, which would cause uneven force on the heavy-duty rolling parts 430 and lead to accelerated wear of the heavy-duty rolling parts 430.

[0145] For heavy workpieces that are not rotating, such as cuboids or irregular shapes, the control module can calculate the center of gravity of the heavy workpiece. Then, based on the position of the center of gravity, the piston rod of the centering hydraulic cylinder 340 can be extended by different lengths to push the heavy workpiece relative to the worktable 300 until their centers of gravity coincide. The control module can calculate the center of gravity of the heavy workpiece and control the centering hydraulic cylinder 340 based on a preset program. The preset program consists of preset values ​​that can be set and stored in the control module according to actual needs. Its specific details are not considered improvements to this solution and will not be elaborated upon here.

[0146] The number of centering hydraulic cylinders 340 is a preset value, such as three, four, six or other numbers, and the specific number can be set according to actual needs.

[0147] Multiple centering hydraulic cylinders 340 can also be controlled individually. When the heavy workpiece is prismatic or irregular in shape, or when the punch head and the worktable 300 are eccentric, the relative position of the heavy workpiece and the worktable 300 can be adjusted in real time by using multiple centering hydraulic cylinders 340, so that the pressure position of the heavy workpiece corresponds to the punch head, thereby improving the flexibility during processing.

[0148] When the piston rod pushes a heavy workpiece, the piston rod will be subjected to radial off-center load because the side of the heavy workpiece being pushed is not perpendicular to the axis of the piston rod. This may cause the piston rod to deflect or even bend due to the radial pressure. By setting a limiting structure 360, the piston rod of the centering hydraulic cylinder 340 can be provided with radial support and limited, preventing the piston rod from deflecting under radial off-center load, thereby maintaining the positional accuracy and stability of the piston rod and preventing bending deformation. By setting an arc-shaped groove to connect with the piston rod, the piston rod can be limited in multiple directions along the circumference of the piston rod by the cooperation of the arc-shaped groove, thereby further improving the stability of the piston rod.

[0149] The cleaning structure 370 is used to automatically clean impurities from the piston rod surface during piston rod extension and retraction, preventing impurities from entering the piston rod and limiting block and causing wear on the piston rod and limiting block. The cleaning structure 370 may include multiple cleaning parts respectively disposed on corresponding limiting blocks. The cleaning parts can be made of various materials, such as at least one of sponge, rubber, and silicone. The cleaning parts can cover the surface of the piston rod and can also be impregnated with lubricating oil to lubricate the piston rod during extension and retraction.

[0150] By utilizing the centering roller 350 to directly contact the heavy workpiece, the heat conduction path between the heavy workpiece and the piston rod can be interrupted, reducing the heat energy transferred to the centering hydraulic cylinder 340 through heat conduction. This prevents problems such as decreased viscosity, decreased oil pressure, and cavitation caused by heating of the hydraulic oil in the centering hydraulic cylinder 340. The centering roller 350 can rotate relative to the piston rod to adaptively adjust its angle, making it suitable for heavy workpieces of various shapes.

[0151] The side of the centering roller 350 is designed as a hexagonal prism, which helps to increase the contact area between the centering roller 350 and the heavy workpiece and improve the stability when the centering roller 350 is connected to the heavy workpiece.

[0152] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.

[0153] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not describe the various possible combinations separately.

[0154] Furthermore, various different implementations of the present invention can be combined arbitrarily, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed in the present invention.

Claims

1. A heavy-duty press rotary table, characterized in that, include: Support platform; A rotary table is rotatably connected to the upper surface of the support platform; the upper surface of the support platform is provided with a first annular groove, and the lower surface of the rotary table is provided with a second annular groove. The first annular groove and the second annular groove enclose an installation space, and a heavy-duty rolling element is provided in the installation space. The worktable matches and fits the upper surface of the rotary table. The rotary table and the worktable are detachably connected. The detachable connection is used to block the temperature transfer path of the workpiece inside the rotary table. The rotary table and the worktable are supported by the heavy-duty rolling elements, enabling the rotary table to rotate coaxially with respect to the support platform.

2. The heavy-duty press rotary table according to claim 1, characterized in that, The upper surface of the support platform is provided with a first annular groove, and the lower surface of the rotary table is provided with a second annular groove. The first annular groove and the second annular groove enclose and form an installation space. A rolling support is provided in the installation space. The rolling support includes a base located in the first annular groove and a top seat located in the second annular groove. The upper surface of the base is provided with a third annular groove, and the lower surface of the top seat is provided with a fourth annular groove. The third annular groove and the fourth annular groove enclose and form a rolling space. The heavy-duty rolling element is disposed in the rolling space. The heavy-duty rolling element includes a plurality of first balls and a plurality of second balls. The diameter of the first balls is larger than the diameter of the second balls. Two adjacent first balls are distributed along the circumferential gap of the third annular groove. Two second balls are provided between two adjacent first balls. The two second balls are respectively located on opposite sides of the first balls along the radial direction of the third annular groove.

3. The heavy-duty press rotary table according to claim 2, characterized in that, The first annular groove is provided with a plurality of elastic support members that provide support for the base. The elastic support members include a support plate connected to the base, a support shaft located below the support plate, and an elastic member sleeved on the support shaft. The elastic member is used to provide an upward pre-tightening first thrust to the base. The elastic support also includes an energy storage hydraulic cylinder, which is spaced apart from the elastic component. The piston rod of the energy storage hydraulic cylinder is connected to the base in a transmission manner. The surface of the base that contacts the piston rod is provided with a pressure sensor array. The energy storage hydraulic cylinder is used to provide a second thrust for upward pre-tightening of the base.

4. The heavy-duty press rotary table according to claim 2, characterized in that, The top seat has a positioning step on the side facing the base, and the base has a stepped groove on the side facing the top seat. The positioning step extends into the stepped groove and is in clearance fit with the stepped groove. The third annular groove is located on the bottom surface of the stepped groove, and the central angle corresponding to the third annular groove is less than 180º. The fourth annular groove is located on the positioning step, and the cross-section of the fourth annular groove is U-shaped. The distance between the bottom of the fourth annular groove and the bottom of the third annular groove is equal to the diameter of the first ball.

5. The heavy-duty press rotary table according to claim 4, characterized in that, The rotary table is provided with an oil injection hole, and the upper surface of the top seat is provided with an annular oil injection groove coaxial with the top seat. The oil injection hole is connected to the annular oil injection groove. The top seat is also provided with a plurality of oil inlet holes connecting the annular oil injection groove and the third annular groove. The cross-section of the annular oil injection groove is arc-shaped. Along the direction from the end of the annular oil injection groove near the oil injection hole to the farthest end from the oil injection hole, the height of the inlet of the oil inlet gradually decreases. The inlet of the oil inlet farthest from the oil injection hole is located at the bottom of the annular oil injection groove. The oil injection hole is either an oblique hole or an L-shaped hole.

6. The heavy-duty press rotary table according to claim 1, characterized in that, The outer surface of the rotary table is provided with an external gear ring, which meshes with multiple drive gears. The multiple drive gears rotate actively to drive the external gear ring to rotate. The multiple drive gears are evenly distributed along the circumference of the external gear ring. The drive gears are bevel gears, and the external gear ring is a bevel gear ring that meshes with the bevel gears. The bevel gears are located below the external gear ring, and a support structure is also provided below the bevel gears. The support structure includes a support rod that is fixed relative to the support table and a driven bevel gear that is rotatably mounted on the support rod. The driven bevel gear meshes with the drive gears. An atomizing nozzle is provided on the support rod pointing towards the upper surface of the drive gear. The atomizing nozzle is connected to an oil supply system through a pipe. The oil supply system is used to provide lubricating oil to the atomizing nozzle.

7. The heavy-duty press rotary table according to claim 1, characterized in that, A heat insulation structure and / or heat insulation material is provided between the worktable and the rotary table; The heat insulation structure includes a heat insulation protrusion on one of the worktable and the rotary table, the heat insulation protrusion being designed as at least a spherical surface, and a heat insulation groove adapted to the heat insulation protrusion on the other of the worktable and the rotary table. The heat insulation protrusion and the heat insulation groove cooperate with each other to form a heat insulation gap between the worktable and the rotary table. The heat insulation structure also includes a reflective layer disposed within the heat insulation gap. A buffer pad is provided on the outer side of the heat insulation protrusion, and the buffer pad is elastically connected between the worktable and the rotary table. The rotary table has a second positioning hole at its center, and the worktable has a second positioning protrusion at its center that mates with the second positioning hole. The second positioning protrusion is at least part of a sphere, and the second positioning hole is at least part of a spherical surface that mates with the second positioning protrusion. A disc spring is fitted on the second positioning protrusion. The lower surface of the workbench is provided with an annular heat-insulating baffle, and the heat-insulating protrusion is located within the area enclosed by the heat-insulating baffle.

8. The heavy-duty press rotary table according to claim 1, characterized in that, The rotary table is connected to a lifting mechanism, which is used to provide upward static pressure to the rotary table. The lifting mechanism includes multiple energy storage servo hydraulic cylinders. The piston rods of the multiple energy storage servo hydraulic cylinders are connected to the rotary table. The piston rods are parallel to the axis of the rotary table. A roller is provided at the end of the piston rod that contacts the rotary table. A pressure equalizing plate is provided at the bottom of the rotary table that is tactilely connected to the roller. The pressure equalizing plate is wavy. An annular limiting groove adapted to the pressure equalizing plate is provided on the rotary table.

9. The heavy-duty press rotary table according to claim 1, characterized in that, The support platform is provided with a first positioning hole, and the rotary table is provided with a first positioning protrusion that mates with the first positioning hole; a sleeve is fitted onto the first positioning protrusion. Along the axial direction of the sleeve, the sleeve is wavy, and the sleeve forms multiple annular wavy grooves, with elastic sealing rings provided in the wavy grooves.

10. The heavy-duty press rotary table according to claim 1, characterized in that, The workbench is equipped with at least three centering hydraulic cylinders. The piston rod of the centering hydraulic cylinder is arranged radially along the workbench. The piston rod of the centering hydraulic cylinder is equipped with a rotatable centering roller. The circumferential side of the centering roller is a regular polygonal prism, and the circumferential side of the centering roller adopts a rounded transition. The workbench is provided with a plurality of limiting structures for limiting the piston rod of the centering hydraulic cylinder. The limiting structure includes at least two limiting blocks located on opposite sides of the piston rod. The limiting blocks are provided with arc-shaped grooves adapted to the piston rod. The arc-shaped grooves are provided with cleaning structures at both ends along the axial direction. The cleaning structures are elastically connected to the piston rod, and the arc-shaped grooves are clearance-fitted with the piston rod.

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