Anti-tilt table for a press
By using an adjustable rigid connection and auxiliary support mechanism on the press, the problems of equipment wear and precision reduction caused by off-center load torque are solved, and a high-efficiency and stable stamping process is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HEFEI METALFORMING MACHINE TOOL
- Filing Date
- 2026-04-20
- Publication Date
- 2026-06-05
AI Technical Summary
In the existing technology, when facing off-center load torque, presses rely on strengthening structural rigidity or complicated mold design, resulting in low production efficiency, high cost, inability to dynamically adapt to actual working conditions, and damage to mold life and precision.
An adjustable rigid connection mechanism and an auxiliary support mechanism are adopted. The adjustable rigid support of the table is achieved through threaded columns and ball joints. Automatic leveling is performed by combining pressure sensors and PID algorithms. The auxiliary support mechanism is disengaged from the ground track during positioning to ensure positioning accuracy.
It effectively counteracts the stamping off-center load torque, improves mold life and part precision, enhances equipment stability and production efficiency, reduces equipment wear and tear, and achieves dynamic adaptive adjustment.
Smart Images
Figure CN122142157A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of press workbench technology, specifically to an anti-eccentric load workbench for a press. Background Technology
[0002] Stamping is a core process in the field of metal forming and is widely used in modern manufacturing industries such as automobiles, aerospace, and home appliances. During the stamping process, especially when producing deep-drawn parts or asymmetrical structural parts (such as car doors and fenders), the force center of the die often does not coincide with the physical center of the press slide and worktable, resulting in significant off-center loading. This off-center loading essentially forms a huge overturning moment, which forces the critical components of the press, especially the slide and worktable, to produce harmful relative tilting and elastic deformation. Currently, the industry mainly relies on several traditional technical means to address off-center loading issues. These include enhancing the rigidity of the equipment structure by using thicker castings or welded structures to passively resist deformation. While these methods have some effect, they cannot fundamentally eliminate the internal stress caused by off-center loading moments. Other methods involve optimizing mold design, such as adding balance blocks, reinforcing guide pillars, or implementing complex surface compensation designs to attempt to adjust the pressure center to the equipment center. However, this significantly increases the design and manufacturing costs and complexity of the molds, and an optimized solution for one mold is usually not transferable to other molds, lacking versatility. Finally, there are process adjustments and manual interventions. Operators mitigate the impact by reducing the nominal tonnage, slowing down the stamping speed, or roughly leveling the mold by inserting shims of varying thicknesses between the worktable and the lower die based on experience. These methods severely sacrifice equipment production efficiency and capacity, and their leveling accuracy is low, dependent on worker experience, unable to adapt to dynamic changes, and have unstable effects.
[0003] Current traditional solutions for dealing with off-center loads are all passive or reactive, mainly relying on increasing structural rigidity or complex mold design. Manual adjustment lacks precision and stability, and manual shim leveling methods have low precision and poor consistency, making it impossible to dynamically adapt to actual working conditions. Passive solutions will accelerate the wear and tear of equipment and molds, and the continuous action of off-center load torque will lead to permanent deterioration of the machine body's precision.
[0004] Therefore, there is an urgent need in this field for an innovative technical solution that can fundamentally and proactively offset the stamping off-center load moment, and achieve uniform load support of the worktable without significantly increasing the weight and cost of the equipment, thereby significantly improving the mold life, part accuracy and equipment stability. Summary of the Invention
[0005] Technical problems to be solved
[0006] To address the shortcomings of existing technologies, this invention provides an anti-eccentric load worktable for presses, which solves the problems of over-reliance on enhanced structural rigidity or complex mold design, insufficient precision and stability of manual adjustment, low precision and poor consistency of manual shim leveling methods, inability to dynamically adapt to actual working conditions, accelerated wear and tear on equipment and molds due to passive bearing solutions, and permanent deterioration of machine body precision caused by continuous eccentric load torque.
[0007] Technical solution To achieve the above objectives, the present invention provides the following technical solution: an anti-eccentric load worktable for a press, comprising a movable base, a ground track, and a table surface, and further comprising: The system includes four cylindrical sections, each equipped with a rigid connecting mechanism. These mechanisms are installed at the four corners of the movable base via the cylindrical sections. Each rigid connecting mechanism uses a threaded column as a support, with the upper end of the threaded column fixedly connected to the lower end of the platform via a ball joint. The rigid connecting mechanism allows for adjustable height adjustment of the platform's tilt angle, enabling the worktable to support the mold from multiple directions and resist the eccentric load generated during workpiece stamping when the mold is closed. An auxiliary support mechanism is installed at the lower end of the movable base. When the movable base moves to the designated position, it can lift the movable base off the ground track and lock it in place, so that the worktable will not shift when subjected to impact. The movable rollers are provided in four places and are respectively installed at the four corners of the movable base. The movable rollers cooperate with the ground track.
[0008] As a further description of the above technical solution, the rigid connection mechanism includes an internally threaded sleeve, which is threadedly connected to a threaded column. A worm gear is fixedly connected to the side wall of the internally threaded sleeve, and a worm is meshed on one side of the worm gear. A drive motor is fixedly connected to one side of the cylinder, and the output end of the drive motor is fixedly connected to one end of the worm. The other end of the worm is rotatably connected to the inner wall of the cylinder through a needle roller bearing. The internal threaded sleeve is equipped with support components at both its upper and lower ends. The internal threaded sleeve is rotatably installed inside the cylinder by the two support components. The upper end of the cylinder is fixedly connected to a cover plate by bolts. A sliding sleeve is provided at the center of the cover plate. A displacement sensor is fixedly connected to one side of the sliding sleeve. The sliding sleeve is sleeved with the side wall of the threaded column. The upper end of the threaded column is fixedly connected to the spherical part of the ball joint. The ball cup part of the ball joint is fixedly connected to the lower end of the platform by high-strength screws.
[0009] As a further description of the above technical solution, the support assembly includes a ring, which is fixed inside a cylinder and has an annular groove. A first annular plate is sleeved inside the annular groove. The first annular plate is fixed at the lower opening of an internally threaded sleeve. A second annular plate is fixedly connected to the upper opening of the internally threaded sleeve. A positioning ring is provided at the lower end of the cover plate. A positioning groove that cooperates with the positioning ring is provided on one side of the second annular plate.
[0010] As a further description of the above technical solution, the first annular plate is provided with a first annular groove on the side opposite to the annular groove, and the second annular plate is provided with a second annular groove on the side opposite to the positioning ring. Multiple balls are rolled between the first annular groove and the second annular groove.
[0011] As a further description of the above technical solution, the side wall of the threaded column is provided with a guide part, a threaded part and a locking part from top to bottom. A locking assembly is provided inside the cylinder. The locking assembly cooperates with the locking part to mechanically lock the threaded column by hydraulic locking, so that the mechanical clearance of the rigid connection mechanism is not easily impacted by the mechanical vibration force transmitted from above the worktable.
[0012] As a further description of the above technical solution, the locking assembly includes a first locking block and a second locking block. Each of the first and second locking blocks has an arc-shaped groove at one end opposite to the locking portion. Four guide posts are sleeved at the four corners of the first locking block through guide holes. One end of each of the four guide posts is fixedly connected to one side of the second locking block. A brake plate is provided on the side wall of the cylinder. A hydraulic cylinder is fixedly connected to one side of the brake plate. The output end of the hydraulic cylinder passes through the side wall of the cylinder and is fixedly connected to one side of the first locking block. The end of each guide post away from the second locking block is fixedly connected to one side of the brake plate. A bushing is sleeved on the side wall of the guide post, and the bushing is fixed to the side wall of the cylinder.
[0013] As a further description of the above technical solution, a fixed seat is provided at the lower end of the cylinder, and a mounting seat is provided at the lower end of the fixed seat. A pressure sensor is installed in the mounting seat. The fixed seat and the mounting seat are installed on the inner wall of the movable base by multiple high-strength bolts. A polygonal hole is opened at the lower end of the locking part, and a polygonal prism is sleeved in the polygonal hole. The polygonal prism is fixed to the upper end of the mounting seat.
[0014] As a further description of the above technical solution, the auxiliary support mechanism includes two T-shaped guide rails, and the lower ends of the two T-shaped guide rails are slidably connected to T-shaped slide blocks. The lower ends of the T-shaped slide blocks are provided with positioning sliders, and the lower ends of the T-shaped slide blocks are fixedly connected with positioning seats. The positioning seats are provided with slots, the corners of the positioning sliders are provided with inclined surfaces, and the slots are provided with chamfers that cooperate with the inclined surfaces. The lower end of the movable base is fixedly connected to a double-outlet oil cylinder, and the two output shaft ends of the double-outlet oil cylinder are respectively fixedly connected to the opposite side of the two T-shaped slides. The lower end of the positioning seat is fixedly connected to a fixing plate.
[0015] As a further description of the above technical solution, a positioning part is provided in the slot, and a locking groove is provided on one side of the positioning slider. When the positioning slider is inserted into the slot, the locking groove is inserted into the positioning part, so that the T-shaped slide and the positioning seat are locked in place.
[0016] As a further description of the above technical solution, the lower end of the horizontal part of the T-shaped slide is fixedly connected to multiple rotating shafts, and each of the multiple rotating shafts is rotatably connected to a positioning roller, which contacts one side of the vertical part of the T-shaped slide.
[0017] Beneficial effects Compared with the prior art, the present invention provides an anti-eccentric load worktable for a press, which has the following beneficial effects: 1. This technical solution can achieve adjustable rigid support for the table surface in the vertical direction through the mounting base cylinder, threaded column and ball joint. It is equivalent to the traditional fixed installation method using bolts and wedges. This technical solution can quickly adjust the tilt angle of the table surface through the adjustable height threaded column to deal with the parallelism of the mold after the worktable moves, as well as the off-center load force generated when the workpiece deforms between the upper and lower molds during stamping.
[0018] 2. This technical solution utilizes a positioning slider and a positioning seat to position the movable base. Due to the height difference between the positioning slider and the slot on the positioning seat, the movable base can be raised as a whole, thereby causing the movable rollers to detach from the ground track. This achieves precise positioning. Furthermore, the positioning seat can directly support the rigid connection mechanism, allowing the impact force of the upper mold to be directly transmitted to the positioning seat. This prevents the structure of the movable worktable from undergoing elastic deformation and ensures that the forming quality of the workpiece is not affected during mold closing and stamping. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the anti-eccentric load worktable for a press proposed in this invention; Figure 2This is a cross-sectional view of a rigid connection mechanism in an anti-eccentric load worktable for a press, as proposed in this invention. Figure 1 ; Figure 3 This is a cross-sectional view of a rigid connection mechanism in an anti-eccentric load worktable for a press, as proposed in this invention. Figure 2 ; Figure 4 This is a schematic diagram of the internal threaded sleeve, worm gear, worm, threaded column, and locking assembly in an anti-eccentric load worktable for a press proposed in this invention. Figure 5 This is a schematic diagram of the internal threaded sleeve and threaded column in an anti-eccentric load worktable for a press proposed in this invention. Figure 6 This is a schematic diagram of the structure of the anti-eccentric load worktable, the movable base, and the auxiliary support mechanism for a press proposed in this invention. Figure 7 This is a schematic diagram of the T-shaped slide, positioning seat, and positioning slider in an anti-eccentric load worktable for a press proposed in this invention; Figure 8 This is a cross-sectional view of the T-shaped slide, positioning seat, and positioning slider in an anti-eccentric load worktable for a press proposed in this invention. Figure 1 ; Figure 9 This is a cross-sectional view of the T-shaped slide, positioning seat, and positioning slider in an anti-eccentric load worktable for a press proposed in this invention. Figure 2 ; Figure 10 This is a schematic diagram of the T-shaped slide, positioning roller, and positioning slider in an anti-eccentric load worktable for a press proposed in this invention; Figure 11 This is a schematic diagram of the positioning seat and positioning part in an anti-eccentric load worktable for a press proposed in this invention; Figure 12 This invention proposes an anti-eccentric load worktable for a press. Figure 7 The right view.
[0020] In the diagram: 1. Movable base; 2. Platform; 3. Ground guide rail; 4. Cover plate; 5. Drive motor; 6. Hydraulic cylinder; 7. Mounting base; 8. Cylinder; 9. Movable roller; 10. Sliding sleeve; 11. Displacement sensor; 12. Guide section; 13. Worm gear; 14. First annular plate; 15. Brake plate; 16. Pressure sensor; 17. Guide column; 18. First locking block; 19. Second locking block; 20. Screw 21. Threaded part; 22. Spherical part; 23. Ball cup part; 24. Ball; 25. Second annular plate; 26. Ring; 27. Polyhedral prism; 28. Bushing; 29. Positioning ring; 30. Worm gear; 31. Locking part; 32. T-shaped slide; 33. Double-outlet oil cylinder; 34. Positioning seat; 35. T-shaped guide rail; 36. Positioning roller; 37. Positioning slider; 38. Positioning part; 39. Locking groove. Detailed Implementation
[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0022] Example See attached document Figure 1-12An anti-eccentric load workbench for a press includes a movable base 1, a ground track 3, and a table surface 2. Four movable rollers 9 are installed on the movable base 1 at its four corners, respectively. The rollers 9 cooperate with the ground track 3. A motor drive system is required on the movable base 1 to allow the rollers 9 to drive the movable base 1 to move at low speed on the ground track 3, facilitating mold changes. Inside the movable base 1, four cylinders 8 are also provided, and each cylinder 8 contains a rigid connection mechanism. The rigid connection mechanism is installed at the four corners of the movable base 1 via the cylinders 8. A fixed seat is provided at the lower end of each cylinder 8, and a mounting seat 7 is provided at the lower end of each fixed seat. A pressure sensor 16 is installed in the mounting seat 7. The fixed seat and the mounting seat 7 are installed on the inner wall of the movable base 1 by multiple high-strength bolts. The rigid connection mechanism uses a threaded column as a support member. The upper end of the threaded column is fixedly connected to the lower end of the table surface 2 via a ball joint. The ball joint is fixedly connected to the ball part 22, and the ball cup part 23 of the ball joint is fixedly connected to the lower end of the table 2 by a high-strength screw. The side wall of the threaded column is provided with a guide part 12, a threaded part 20 and a locking part 31 from top to bottom. The lower end of the locking part 31 is provided with a polygonal hole, and a polygonal prism 27 is sleeved in the polygonal hole. The polygonal prism 27 is fixed to the upper end of the mounting base 7. The rigid connection mechanism adjusts the tilt angle of the table 2 by adjusting the telescopic height, so that the worktable can support the mold from multiple directions and resist the off-center load generated when stamping the workpiece during mold closing. like Figure 1 and Figure 2 As shown, adjustable rigid support for the table 2 can be achieved vertically through the mounting base 7, cylinder 8, threaded column, and ball joint. This is equivalent to the traditional fixing method using bolts and wedges. This technical solution uses the height-adjustable threaded column to quickly adjust the tilt angle of the table 2, addressing the parallelism of the mold after it moves on the worktable, and the eccentric load generated when the workpiece deforms between the upper and lower molds during stamping. The specific technical solution is as follows: The rigid connection mechanism designed in the technical solution includes an internal threaded sleeve 21, which is threadedly connected to a threaded post. A worm gear 13 is fixedly connected to the side wall of the internal threaded sleeve 21. A worm 30 is meshed on one side of the worm gear 13. A drive motor 5 is fixedly connected to one side of the cylinder 8. The output end of the drive motor 5 is fixedly connected to one end of the worm 30. The other end of the worm 30 is rotatably connected to the inner wall of the cylinder 8 through a needle roller bearing. Support assemblies are installed at both the upper and lower ends of the internal threaded sleeve 21. The internal threaded sleeve 21 is rotatably installed inside the cylinder 8 by the two support assemblies. A cover plate 4 is fixedly connected to the upper end of the cylinder 8 by bolts. A sliding sleeve 10 is provided at the center of the cover plate 4. A displacement sensor 11 is fixedly connected to one side of the sliding sleeve 10. The sliding sleeve 10 is sleeved with the side wall of the threaded column. The support assembly includes a ring 26. The ring 26 is fixed inside the cylinder 8 and is provided with an annular groove. A first annular plate 14 is sleeved in the annular groove. The first annular plate 14 is fixed at the lower end opening of the internal threaded sleeve 21. A second annular plate 25 is fixedly connected to the upper end opening of the internal threaded sleeve 21. A positioning ring 29 is provided at the lower end of the cover plate 4. A positioning groove that cooperates with the positioning ring 29 is provided on one side of the second annular plate 25. The first annular plate 14 has a first annular groove on the side opposite to the annular groove, and the second annular plate 25 has a second annular groove on the side opposite to the positioning ring 29. Multiple balls 24 are rolled between the first annular groove and the second annular groove.
[0023] like Figures 2-5 As shown, the drive motor 5 drives the worm gear 30 to rotate the worm wheel 13. The rotation of the worm wheel 13 drives the internal threaded sleeve 21 to rotate. When the internal threaded sleeve 21 rotates, it interacts with the threaded part 20 on the threaded column, causing the threaded column to move upward. When the threaded column moves upward, it pushes the ball joint to move the table 2 upward, thereby providing an unbalanced support force to the table. This allows the table to provide a support force exceeding that of the other three dead points when the mold is under stress, thus enabling the table 2 to provide anti-eccentric load support force to the mold. Since it is difficult to obtain the actual eccentric load force when the mold is unloaded, a workpiece is first placed in the mold as a sample after the mold is installed, and a stamping is completed using a press. During stamping, when the workpiece, especially an irregularly shaped workpiece, deforms, a lateral force is generated in the mold cavity, which is the main factor causing the eccentric load force. Therefore, when the workpiece is deformed by the press stamping mold, the lower end of the worktable that bears the stamping force will experience uneven force. Therefore, a high-precision pressure sensor 16 installed in the mounting base 7 is used to collect the force at four points. The control system uses real-time acquisition of the electrical signals from the four pressure sensors. The PLC controller continuously calculates the pressure difference between each point as the control basis. The PID algorithm is used to convert the pressure deviation into a control quantity and output it to the drive motor 5. The motor drives the corresponding lead screw through the worm gear 13 and worm 30 to adjust the height, forming a closed-loop feedback of "detecting pressure difference → calculating adjustment amount → performing height compensation → re-detecting". When all sensor pressure values reach dynamic equilibrium (pressure difference approaches zero and is within the allowable error range), the PID output drops to the maintenance threshold, the motor stops adjusting, and the system enters a stable holding state. The entire process achieves automatic leveling closed-loop control of multi-support unbalanced forces. The above closed-loop control uses existing technology, which will not be elaborated on here. In this way, the support rigidity of the platform 2 can be adjusted by the threaded columns designed at the four corners, and the adjustment angle range is a fine adjustment angle of 0.1°-1°.
[0024] To reduce the mechanical clearance of the rigid connection mechanism from sloshing under impact, this technical solution also includes a locking component inside the cylinder 8. The locking component, in conjunction with the locking part 31, mechanically locks the threaded column by means of hydraulic locking, so that the mechanical clearance of the rigid connection mechanism is less likely to be impacted by the mechanical vibration force transmitted from above the worktable.
[0025] The locking assembly includes a first locking block 18 and a second locking block 19. The first locking block 18 and the second locking block 19 are each provided with an arc-shaped groove that matches the locking part 31 at their opposite ends. Four guide posts 17 are sleeved at the four corners of the first locking block 18 through guide holes. One end of each of the four guide posts 17 is fixedly connected to one side of the second locking block 19. A brake plate 15 is provided on the side wall of the cylinder 8. A hydraulic cylinder 6 is fixedly connected to one side of the brake plate 15. The output end of the hydraulic cylinder 6 passes through the side wall of the cylinder 8 and is fixedly connected to one side of the first locking block 18. The end of the guide post 17 away from the second locking block 19 is fixedly connected to one side of the brake plate 15. A bushing 28 is sleeved on the side wall of the guide post 17 and the bushing 28 is fixed on the side wall of the cylinder 8. like Figures 2-4As shown, after adjustment, the system controls the hydraulic cylinder 6 to push the first locking block 18 to move. At the same time, the hydraulic cylinder 6 drives the brake plate 15 to pull the guide column 17 under force. The guide column 17 under force drives the second locking block 19 to move under force. In this way, the first locking block 18 and the second locking block 19 can jointly squeeze the locking part 31 on the threaded column, so that the threaded column will not be axially deflected when subjected to the impact force at the upper end, thus ensuring the stability of the rigid connection mechanism after adjustment.
[0026] In existing technology, the design of the movable worktable facilitates the removal of the mold from under the press. This is achieved through the use of tracks and rollers, with precise motor control of the movement distance. This allows the mold to accurately reach below the press slide during mold changes, facilitating quick installation and fixing of the upper mold by technicians. However, due to the continuous punching pressure provided by the press, the roller shaft components supporting the weight above will deform under the impact force. This causes changes in the positioning accuracy of the rollers and the installation accuracy of the mold. This change directly affects the mold closing accuracy, severely impacting the stamping precision and leading to defective products. Therefore, this technical solution incorporates an auxiliary support mechanism. This mechanism is installed at the lower end of the movable base 1. When the movable base 1 moves to the designated position, it can be lifted off the ground track 3 by 1-4mm. At this point, the movable roller 9 has detached from the surface of the ground track 3. Since the auxiliary support mechanism also acts as a locking and positioning mechanism, the worktable will not shift under punching pressure during use, ensuring positioning and mold closing accuracy. The specific technical solution is as follows: The auxiliary support mechanism includes two T-shaped guide rails 35, and a T-shaped slide block 32 is slidably connected to the lower end of each of the two T-shaped guide rails 35. A positioning slider 37 is provided at the lower end of the T-shaped slide block 32, and a positioning seat 34 is fixedly connected to the lower end of the T-shaped slide block 32. A slot is provided on the positioning seat 34, and an inclined surface is provided at the corner of the positioning slider 37. A chamfer is provided on the slot to match the inclined surface. A double-outlet oil cylinder 33 is fixedly connected to the lower end of the movable base 1. The two output shaft ends of the double-outlet oil cylinder 33 are fixedly connected to the opposite side of the two T-shaped slide blocks 32, respectively. like Figures 8-9As shown, when the auxiliary support mechanism is not working, the lowest plane of the positioning slider 37 is located below the plane at the bottom of the slot, with a height of 1-4mm. When locked, the positioning slider 37 is inserted into the slot by the push of the double-outlet oil cylinder 33. During the insertion process, the positioning slider 37 can be accurately guided into the slot by the cooperation of the inclined surface and the chamfer. At this time, the moving base 1 can be positioned. Due to the height difference between the positioning slider 37 and the slot on the positioning seat 34, the entire moving base can be raised, thereby causing the moving roller 9 to leave the ground track 3. This achieves precise positioning. The positioning seat 34 can be used to directly support the rigid connection mechanism, so that the impact force of the upper mold can be directly transmitted to the positioning seat 34, so that the structure of the moving worktable will not undergo elastic deformation and will not affect the forming quality of the workpiece during mold closing and stamping.
[0027] A fixing plate is fixedly connected to the lower end of the positioning seat 34. The fixing plate can fix the positioning seat 34 to the ground foundation, so that the auxiliary support mechanism can provide sufficient support strength. The technical solution for locking the auxiliary support mechanism is that a positioning part 38 is provided in the slot, and a locking groove 39 is provided on one side of the positioning slider 37. When the positioning slider 37 is inserted into the slot, the positioning part 38 is inserted into the locking groove 39, so that a mutual interlocking effect can be formed, so that the positioning slider 37 will not have vertical displacement in the positioning seat 34, and the T-shaped slide 32 and the positioning seat 34 are locked. Multiple rotating shafts are fixedly connected to the lower end of the horizontal part of the T-shaped slide 32. Positioning rollers 36 are rotatably connected to the shaft walls of the multiple rotating shafts. The positioning rollers 36 are in contact with the vertical part of the T-shaped slide 32. The positioning rollers 36 play a guiding and positioning role when the positioning slider 37 is inserted into the slot, so that the positioning slider 37 with high fit can be smoothly engaged with the slot.
[0028] It should be noted that the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An anti-eccentric load worktable for a press, comprising a movable base (1), a ground track (3), and a table surface (2), characterized in that, Also includes: Four cylinders (8) are provided, and each cylinder (8) is equipped with a rigid connection mechanism. The rigid connection mechanism is installed at the four corners of the movable base (1) through the cylinder (8). The rigid connection mechanism uses a threaded column as a support. The upper end of the threaded column is fixedly connected to the lower end of the table (2) through a ball joint. The rigid connection mechanism adjusts the tilt angle of the table (2) through adjustable telescopic height, so that the worktable can support the mold from multiple directions and resist the off-center load generated when stamping the workpiece during mold closing. An auxiliary support mechanism is installed at the lower end of the movable base (1). When the movable base (1) moves to the designated position, it can lift the movable base (1) away from the ground track (3) and can also play a locking and positioning role so that the worktable will not deviate when subjected to impact force. Four movable rollers (9) are provided and installed at the four corners of the movable base (1). The movable rollers (9) cooperate with the ground track (3).
2. The anti-eccentric load worktable for a press according to claim 1, characterized in that: The rigid connection mechanism includes an internal threaded sleeve (21), which is threadedly connected to a threaded column. A worm gear (13) is fixedly connected to the side wall of the internal threaded sleeve (21). A worm (30) is meshed on one side of the worm gear (13). A drive motor (5) is fixedly connected to one side of the cylinder (8). The output end of the drive motor (5) is fixedly connected to one end of the worm (30). The other end of the worm (30) is rotatably connected to the inner wall of the cylinder (8) through a needle roller bearing. The internal threaded sleeve (21) is equipped with support components at both the upper and lower ends. The internal threaded sleeve (21) is rotatably installed in the cylinder (8) by the two support components. The upper end of the cylinder (8) is fixedly connected to a cover plate (4) by bolts. A sliding sleeve (10) is provided at the center of the cover plate (4). A displacement sensor (11) is fixedly connected to one side of the sliding sleeve (10). The sliding sleeve (10) is sleeved with the side wall of the threaded column. The upper end of the threaded column is fixedly connected to the ball part (22) of the ball joint. The ball cup part (23) of the ball joint is fixedly connected to the lower end of the table (2) by high-strength screws.
3. The anti-eccentric load worktable for a press according to claim 2, characterized in that: The support assembly includes a ring (26), which is fixed inside the cylinder (8) and has an annular groove. A first annular plate (14) is sleeved inside the annular groove. The first annular plate (14) is fixed at the lower opening of the internal threaded sleeve (21). A second annular plate (25) is fixedly connected at the upper opening of the internal threaded sleeve (21). A positioning ring (29) is provided at the lower end of the cover plate (4). A positioning groove that cooperates with the positioning ring (29) is provided on one side of the second annular plate (25).
4. The anti-eccentric load worktable for a press according to claim 3, characterized in that: The first annular plate (14) has a first annular groove on the side opposite to the annular groove, and the second annular plate (25) has a second annular groove on the side opposite to the positioning ring (29). Multiple balls (24) are rolled between the first annular groove and the second annular groove.
5. The anti-eccentric load worktable for a press according to claim 1, characterized in that: The side wall of the threaded column is provided with a guide part (12), a threaded part (20) and a locking part (31) from top to bottom. A locking assembly is provided inside the cylinder (8). The locking assembly cooperates with the locking part (31) to mechanically lock the threaded column by means of hydraulic locking, so that the mechanical gap of the rigid connection mechanism is not easily impacted by the mechanical vibration force transmitted above the worktable.
6. The anti-eccentric load worktable for a press according to claim 5, characterized in that: The locking assembly includes a first locking block (18) and a second locking block (19). The first locking block (18) and the second locking block (19) are each provided with an arc-shaped groove that matches the locking part (31) at their opposite ends. Four guide posts (17) are sleeved at the four corners of the first locking block (18) through guide holes. One end of each of the four guide posts (17) is fixedly connected to one side of the second locking block (19). A brake plate (15) is provided on the side wall of the cylinder (8). A hydraulic cylinder (6) is fixedly connected to one side of the brake plate (15). The output end of the hydraulic cylinder (6) passes through the side wall of the cylinder (8) and is fixedly connected to one side of the first locking block (18). The end of the guide post (17) away from the second locking block (19) is fixedly connected to one side of the brake plate (15). A bushing (28) is sleeved on the side wall of the guide post (17). The bushing (28) is fixed on the side wall of the cylinder (8).
7. The anti-eccentric load worktable for a press according to claim 5, characterized in that: The lower end of the cylinder (8) is provided with a fixed seat, and the lower end of the fixed seat is provided with a mounting seat (7). A pressure sensor (16) is installed in the mounting seat (7). The fixed seat and the mounting seat (7) are installed on the inner wall of the movable base (1) by multiple high-strength bolts. The lower end of the locking part (31) is provided with a polygonal hole, and a polygonal prism (27) is sleeved in the polygonal hole. The polygonal prism (27) is fixed to the upper end of the mounting seat (7).
8. The anti-eccentric load worktable for a press according to claim 1, characterized in that: The auxiliary support mechanism includes two T-shaped guide rails (35), and the lower ends of the two T-shaped guide rails (35) are slidably connected to T-shaped slide blocks (32). The lower ends of the T-shaped slide blocks (32) are provided with positioning sliders (37), and the lower ends of the T-shaped slide blocks (32) are fixedly connected with positioning seats (34). The positioning seats (34) are provided with slots, and the corners of the positioning sliders (37) are provided with inclined surfaces. The slots are provided with chamfers that cooperate with the inclined surfaces. The lower end of the movable base (1) is fixedly connected to a double-outlet oil cylinder (33), and the two output shaft ends of the double-outlet oil cylinder (33) are fixedly connected to the opposite side of the two T-shaped slides (32), respectively. The lower end of the positioning seat (34) is fixedly connected to a fixing plate.
9. The anti-eccentric load worktable for a press according to claim 8, characterized in that: The slot is provided with a positioning part (38), and a locking groove (39) is provided on one side of the positioning slider (37). When the positioning slider (37) is inserted into the slot, the locking groove (39) is inserted into the positioning part (38), so that the T-shaped slide (32) and the positioning seat (34) are locked in place.
10. An anti-eccentric load worktable for a press according to claim 8, characterized in that: The lower horizontal part of the T-shaped slide (32) is fixedly connected to multiple rotating shafts, and each of the multiple rotating shafts is rotatably connected to a positioning roller (36), which contacts one side of the vertical part of the T-shaped slide (32).