An integrated intelligent monitoring longitudinal double-helical shaft toggle link double-point press

Abstract

The application discloses a longitudinal double-crank elbow lever type double-point press machine integrated with intelligent monitoring and belongs to the field of metal plastic working equipment. The press machine comprises a three-part machine body frame formed by a cross beam, a stand and a base through pre-tightening of tension bolts and a sliding block arranged in the three-part machine body frame. A transmission system of the press machine synchronously drives two longitudinal cranks through gear meshing. The cranks drive guide columns fixed to the sliding block through a symmetrical elbow lever connecting rod mechanism, so that the sliding block obtains the motion characteristic of overlength pressure maintaining at the lower dead point. A die adjusting mechanism and a hydraulic locking mechanism driven by a worm wheel box are arranged in the sliding block, so that the die adjusting mechanism can accurately adjust and lock the die mounting height. The application has high rigidity, high synchronous precision and excellent anti-unbalanced load capacity and is particularly suitable for cold extrusion forming of precise parts such as hydrogen fuel cell metal bipolar plates.

Description

Technical Field

[0001] This invention belongs to the field of high-end metal plastic forming equipment, specifically relating to a longitudinal double crankshaft elbow type double-point press with intelligent monitoring and ultra-long pressure holding function, which is particularly suitable for cold extrusion forming of precision parts with high precision control. Background Technology

[0002] As the core equipment for metal plastic processing, the traditional transmission form of the press usually adopts a crank-connecting rod mechanism. This mechanism drives the flywheel and crankshaft to rotate through the motor, converting the circular motion into the linear reciprocating motion of the slider.

[0003] However, this classic structure has inherent limitations in its motion characteristics: the running cycle of the slider is basically symmetrical, resulting in a very short dwell time in the most critical bottom dead center region of forming, which cannot provide a stable pressure holding process. Therefore, traditional crank presses are mainly suitable for separation processes such as punching and blanking, while their application is greatly limited in plastic forming processes such as precision cold extrusion, thick plate stretching and stamping, which have strict requirements for bottom dead center pressure holding.

[0004] At the same time, with the rapid development of high-end manufacturing, unprecedentedly higher requirements have been placed on the process capabilities of presses. A typical example is the manufacturing of metal bipolar plates for hydrogen fuel cells. These workpieces usually have complex micro-channels and extremely thin walls. Their forming process not only requires extremely high stamping accuracy and rigidity, but more importantly, the slide needs to have a sufficiently long and stable dwell time at the bottom dead center to ensure that the material flows and is shaped fully and uniformly. Obviously, traditional crank presses cannot meet such demanding process conditions.

[0005] To address the common challenge of holding pressure at the bottom dead center, the industry has turned its attention to toggle presses. These machines employ multi-link mechanisms, and by optimizing the linkage parameters, they can fundamentally alter the motion curve of the slider. Their greatest advantage lies in the significant reduction in slider speed and the substantial extension of dwell time near the bottom dead center (approximately 980% longer than that of ordinary crank presses). Simultaneously, the return speed is faster. This makes toggle presses particularly suitable for processes requiring full plastic deformation of materials, such as stretching, stamping, and thick plate blanking, effectively reducing springback and improving forming accuracy.

[0006] However, even with the adoption of toggle mechanisms, existing presses still face a series of severe challenges in dealing with future large-scale industrial production. For example, to meet the demand for high-efficiency production, the equipment needs to have the characteristics of large tonnage and wide table, which puts forward higher requirements on the overall rigidity of the machine body, the synchronization accuracy of the dual-point transmission, and the guiding stability under ultra-long slide stroke. In addition, how to maintain the stability of the mold height during long-term continuous operation and avoid loss of accuracy due to vibration or temperature changes is also a core problem that urgently needs to be solved.

[0007] Meanwhile, with the development of intelligent manufacturing, traditional presses generally lack the ability to conduct online intelligent monitoring and high-precision measurement of key parameters in the forming process (such as actual holding pressure, dynamic accuracy of the bottom dead center of the slide, and micro-strain of the machine body). This makes it difficult to achieve closed-loop quality control and predictive maintenance due to the lack of data support for process optimization, which restricts their stability and traceability in the mass production of high-end precision parts.

[0008] In conclusion, the market urgently needs a new type of press that not only inherits the advantages of the toggle mechanism in maintaining pressure at the bottom dead center, but also achieves a comprehensive breakthrough in overall structural rigidity, motion synchronization accuracy, guiding stability, and long-term working accuracy maintenance, so as to truly meet the industrial production needs of the high-end precision forming field. Summary of the Invention

[0009] To address the problems of short holding time, low precision, and insufficient resistance to eccentric loads in traditional crank presses, as well as the poor rigidity, synchronization accuracy, and long-term precision retention of existing toggle presses under wide table and high-tonnage conditions, this invention proposes a novel longitudinal double-crankshaft toggle-type dual-point press solution. This solution aims to inherit the low-speed pressure holding advantages of the toggle mechanism while fundamentally improving the overall rigidity, motion synchronization accuracy, and operational stability of the equipment under heavy load and wide table conditions through collaborative and innovative structural design.

[0010] The present invention provides a longitudinally mounted double crankshaft elbow-type dual-point press with integrated intelligent monitoring. Its main structure includes a closed frame body composed of a crossbeam, a column and a base connected by tension bolts. The slider is set inside the frame body, and its two sides are connected by copper guide plates to form a sliding fit with an extra-long guide rail installed on the column to achieve precise guidance.

[0011] The core transmission and power conversion system of this invention comprises the following interconnected parts: a transmission system consisting of an electric motor, flywheel, clutch, drive shaft, large gear, and two small gears; a double crankshaft mechanism consisting of a first crankshaft and a second crankshaft that are longitudinally mounted in a crossbeam and rotate synchronously through a pair of meshing small gears; and an elbow linkage mechanism consisting of a main connecting rod, an upper elbow rod, and a lower elbow rod hinged together. The above systems work together to ultimately convert the rotational motion of the crankshaft into the linear reciprocating motion of the slider.

[0012] Specifically, the fuselage frame adopts a three-part combined structure. The crossbeams, columns and base are precisely positioned by positioning keys and positioning sleeves, and high preload is applied by tension bolts to ensure that each joint surface remains tightly fitted without gaps when bearing working loads, thereby forming a highly rigid closed force system.

[0013] In terms of transmission layout, one end of the drive shaft is connected to the clutch, and the other end is machined with a gear that meshes with the large gear. The large gear and the second small gear are connected by a key to form a combination, and the second small gear meshes with the first small gear. This gear transmission chain ensures the absolute synchronization of the double crankshaft rotation, which is the key to ensuring the motion accuracy of the double-point press.

[0014] The elbow linkage mechanism is symmetrically arranged on both sides of the crossbeam. The upper elbow is hinged to the first pin fixed to the crossbeam, and the lower elbow is hinged to the third pin fixed to the upper end of the guide post. The main connecting rod is hinged to both the upper and lower elbows through the second pin. The rotation of the crankshaft drives this elbow system through the main connecting rod, which in turn drives the slider connected to the guide post.

[0015] To accurately set and maintain the mold mounting height of the slider over a long period, this invention includes a mold adjustment and locking mechanism. This mechanism comprises left and right worm gear boxes linked by a connecting shaft, an adjusting screw connected to the output of the worm gear boxes, and an adjusting nut fixed to the guide post and threadedly engaged with the adjusting screw. Crucially, the adjusting screw is also equipped with a locking assembly consisting of a locking nut and a hydraulic cylinder. The high-pressure oil chamber formed between the two can generate axial force to eliminate the clearance of the threaded pair and achieve reliable locking of the mold height.

[0016] In addition, the present invention also includes a guide post and guide sleeve assembly as an important auxiliary guiding and load-bearing mechanism. The guide post and the slider are fixed together and extend into the guide sleeve fixed to the crossbeam. The contact surface of the two is provided with a copper tile containing an oil groove, which can withstand the main lateral force.

[0017] The lubrication system provides thin oil lubrication for key friction pairs and collects and recycles the lubricating oil through an oil return box located below the column guide rail.

[0018] The balancer uses a high-pressure air chamber inside the cylinder to provide an upward balancing force for stable operation through its balance cylinder fixed to the crossbeam and piston rod connected to the slider.

[0019] Behind the press, there is a maintenance platform near the clutch, which facilitates the maintenance and replacement of easily worn parts such as clutch friction plates.

[0020] Furthermore, the intelligent monitoring function described in this invention collects multi-dimensional data such as crankshaft phase, connecting rod force, and micro-strain of the fuselage through sensors (such as encoders, pressure sensors, and strain gauges) integrated in key parts, and transmits them to the upper system via a data interface to realize real-time monitoring, process analysis, and predictive maintenance of the molding process.

[0021] Compared with the prior art, the present invention brings significant beneficial effects through the above-described integrated design:

[0022] 1. The three-part pre-tightened body and guide post and guide sleeve assembly form multiple closed force flows, which greatly enhances the equipment's resistance to eccentric loads and the bottom dead center repeatability (up to ±0.02mm), which is beneficial to extending the mold life.

[0023] 2. The symmetrical elbow mechanism driven by the longitudinal double crankshaft, combined with the unique gear synchronization system, not only ensures the precise synchronization of the two-point movement, but also achieves an ultra-long pressure holding time of more than 60° crankshaft rotation near the bottom dead center of the slider. It can output full-tonnage pressure throughout the process, adapting to precision forming processes with strict requirements for pressure holding, such as cold extrusion and thick plate fine blanking.

[0024] 3. The hydraulic nut locking mechanism fundamentally prevents mold height drift; the extra-long guide rail and independent guide posts and sleeves share the lateral force and reduce the wear of the guide components; the thin oil circulation lubrication system improves the service life of each friction pair; the balancer effectively improves the transmission smoothness and operational safety.

[0025] 4. The wide double-point table design can accommodate larger molds; the adjustable mold mounting height enhances the equipment's versatility; and the integrated maintenance platform makes the replacement of key wear parts more convenient.

[0026] In summary, through a series of collaborative and innovative structural designs, this invention successfully provides a high-performance press with sufficient rigidity, high precision, long holding time, stable operation, and wide applicability, effectively solving the key equipment bottleneck problem in high-end precision plastic forming, especially in the mass production of high-precision parts such as metal bipolar plates for hydrogen fuel cells. Attached Figure Description

[0027] Figure 1 This is a front view of the longitudinally mounted double-crankshaft elbow-type double-point press of the present invention;

[0028] Figure 2 yes Figure 1 The first sectional view of the press shown along the frontal view mainly shows the toggle linkage system, the slider mold adjustment and locking mechanism;

[0029] Figure 3 yes Figure 1 The second sectional view of the press shown in the frontal view mainly shows the structure of the balancer.

[0030] Figure 4 This is a top view of the press of the present invention;

[0031] Figure 5 yes Figure 4 The first sectional view along the top view direction mainly shows the longitudinally mounted double crankshaft drive and synchronous gear system;

[0032] Figure 6 yes Figure 4The second sectional view along the upward direction mainly shows the connection relationship between the clutch, flywheel and drive shaft;

[0033] Figure 7 This is a rear view of the press of the present invention, mainly showing the drive shaft, the large gear and its key connection structure;

[0034] Figure 8 This is a three-dimensional schematic isometric view of the transmission component of the present invention;

[0035] Figure 9 This is a three-dimensional schematic exploded or sectional axonometric view of the beam assembly of the present invention;

[0036] Figure 10 This is a three-dimensional schematic exploded or cross-sectional axonometric view of the slider and column guide assembly of the present invention;

[0037] Figure 11 This is a schematic diagram of the curve showing the change in the displacement of the press slide as a function of the rotation angle of the main gear.

[0038] Figure 12 This is a schematic diagram showing the position of the elbow mechanism at the top dead center of the press of the present invention;

[0039] Figure 13 This is a schematic diagram showing the position of the elbow mechanism at the bottom dead center of the press of the present invention;

[0040] The labels in the diagram indicate: 1. Motor; 2. Crossbeam; 3. Column; 4. Slider; 5. Platform; 6. Base; 7. Tensioning bolt; 8. Pin No. 1; 9. Pin No. 2; 10. Pin No. 3; 11. Guide column; 12. Guide sleeve; 13. Adjusting screw; 14. Left worm gear box; 15. High-pressure oil chamber; 16. Upper elbow rod; 17. Main connecting rod; 18. Lower elbow rod; 19. Balancer; 20. Adjusting nut; 21. Nut locking mechanism; 22. Right worm gear box; 23. Column guide rail; 24. Locking screw 25. Cap; 26. Hydraulic cylinder; 27. Oil return box; 28. Piston; 29. ​​Balance cylinder; 30. Piston rod; 31. High-pressure air chamber; 32. Fixed seat; 33. Maintenance table; 34. Clutch; 35. Flywheel; 36. Pulley; 37. Rear axle sleeve; 38. No. 1 crankshaft; 39. Front axle sleeve; 40. No. 1 pinion; 41. Encoder; 42. No. 2 pinion shaft extension; 43. No. 2 crankshaft; 44. No. 2 pinion; 45. Large gear; 46. Drive shaft; 47. Flat key; 48. Long flat key. Detailed Implementation

[0041] To enhance understanding of the present invention, the invention will be further described in detail below with reference to embodiments and accompanying drawings. These embodiments are only for explaining the invention and do not constitute a limitation on the scope of protection of the invention.

[0042] like Figures 1 to 13As shown, the present invention provides a longitudinally mounted double crankshaft elbow-type dual-point press with integrated intelligent monitoring. Its core lies in constructing a pressure forming platform with high rigidity, high precision and excellent low-speed pressure holding characteristics through a series of mutually coordinated structural designs that form a closed force flow.

[0043] I. High-rigidity three-part pre-tensioned fuselage frame

[0044] like Figure 1 , Figure 4 and Figure 9 As shown, the fuselage frame is composed of three major independent cast or welded parts: the upper crossbeam 2, the middle left and right columns 3, and the lower base 6.

[0045] The mating surfaces between the crossbeam 2, column 3 and base 6 are initially precisely positioned by precision-machined positioning keys and positioning sleeves, and a huge preload is applied by four high-strength tension bolts 7 running through the entire frame, tightly connecting the three major components into a whole. This design ensures that even when the machine body is subjected to huge asymmetrical working loads, the mating surfaces can still maintain a tight fit without gaps.

[0046] The slider 4 is set in the frame space composed of two columns 3. Its two sides are connected to the extra-long and thickened column guide rail 23 processed on the inner side of the column 3 through large copper guide plates to form a main guide and auxiliary guide. This structure can effectively withstand the off-center load torque from the front and back and left and right directions, laying a solid foundation for the long-term precision and stability of the whole machine.

[0047] II. Vertically mounted double crankshaft absolute synchronous drive system

[0048] like Figure 5 , Figure 7 and Figure 8 As shown, the motor 1 drives the flywheel 34 to store energy through the pulley 35. When working, the clutch 33 is engaged to transmit the rotational kinetic energy to the longitudinally mounted drive shaft 45. The other end of the drive shaft 45 is machined with a gear that meshes with the large gear 44.

[0049] The key is that the large gear 44 is fixedly connected to the extended hub of the second small gear 43 (i.e., the second small gear shaft extension 41) via a long flat key 47, forming a synchronously rotating assembly; the second small gear 43 meshes with the first small gear 39; the first crankshaft 37 and the second crankshaft 42 are respectively connected to the first small gear 39 and the second small gear 43 via flat keys 46, and are arranged in parallel longitudinal directions along the axis, supported in the front bushing 38 and the rear bushing 36 inside the crossbeam 2. This unique gear transmission chain ensures that the first crankshaft 37 and the second crankshaft 42 maintain a completely synchronous rotation phase at any time, which is the fundamental guarantee for achieving the consistency of movement of the slider 4 of the dual-point press and eliminating torsional deformation.

[0050] III. Symmetrical Elbow-Lever Motion Conversion Mechanism

[0051] like Figure 2 , Figure 12 and Figure 13 As shown, a symmetrical elbow linkage mechanism is installed on the crank of each crankshaft, which includes a main connecting rod 17, an upper elbow 16, and a lower elbow 18.

[0052] The main connecting rod 17 is a split structure, which is mounted on the crankshaft crank by high-strength bolts, and the mating surface is provided with wear-resistant copper pads.

[0053] The upper end of the upper elbow 16 is hinged to the first pin 8 fixed on the crossbeam 2, and the lower end is hinged together with the lower end of the main connecting rod 17 and the upper end of the lower elbow 18 through the second pin 9.

[0054] The lower end of the lower elbow 18 is hinged to the No. 3 pin 10 fixed to the upper end of the guide post 11.

[0055] When the synchronously rotating hypercrankshaft drives the main connecting rod 17 to swing, this six-bar linkage system converts the rotational motion into an approximately vertical linear motion of the guide post 11. By precisely optimizing the length ratio of each link, this mechanism causes the slider 4 to sharply decrease in speed and generate a force amplification effect as it approaches the bottom dead center, ultimately achieving the desired effect. Figure 11 The ideal motion curve shown is as follows: an ultra-long pressure holding platform with a crankshaft rotation angle of more than 60° is formed near the bottom dead center, and the full-tonnage nominal force can be continuously output throughout the entire working stroke, thus adapting to forming processes that require low speed, stability and long-term pressure holding, such as cold extrusion and precision stamping.

[0056] IV. Precision mold adjustment and active mold height locking mechanism

[0057] like Figure 2 and Figure 10 As shown, the slider 4 has a left worm gear box 14 and a right worm gear box 22 that are symmetrically arranged inside. The two are linked by a connecting shaft. The mold adjustment motor drives the connecting shaft through a sprocket, which drives the worm gear in the worm gear box to rotate, and then drives the adjusting screw 13 to rotate. The adjusting screw 13 and the adjusting nut 20 fixedly installed on the guide post 11 form a threaded pair to realize the overall height adjustment of the slider 4.

[0058] The improvement lies in the hydraulic nut locking mechanism 21, which includes a locking nut 24 threadedly connected to the adjusting screw 13 and a hydraulic cylinder 25 fixed on the adjusting nut 20. High-pressure oil is injected between the locking nut 24 and the hydraulic cylinder 25 to form a high-pressure oil chamber 15. The huge axial force generated by the high-pressure oil forces the threaded side of the locking nut 24 to fit tightly with the threaded side of the adjusting screw 13, completely eliminating the gap of the threaded transmission pair and generating huge anti-loosening friction. This active pre-tightening and zero-gap locking mechanism can fundamentally prevent the die height from creeping under high-speed, high-load impact and vibration of the press, thereby keeping the bottom dead center repeatability accuracy within ±0.02mm for a long time.

[0059] V. Auxiliary System Integration

[0060] To improve overall performance, this invention also integrates several auxiliary systems:

[0061] 1. Auxiliary guiding and load-bearing system of guide column and guide sleeve: The guide sleeve 12 is fixedly installed at the bottom of the crossbeam 2, and the upper part of the guide column 11 extends into it for sliding fit. The contact surface is provided with a copper tile with an oil groove. This structure not only provides a second precision guide for the slider 4, but also forms a closed columnar load-bearing frame with the crossbeam 2, which significantly enhances the lateral rigidity of the machine body and effectively shares the lateral load of the main guide rail 23.

[0062] 2. Thin oil circulation lubrication and recovery system: Provides forced thin oil lubrication for all rotating hinge points and sliding surfaces, and sets up an oil return box 26 below the column guide rail 23 to collect the lubricating oil, filter it and recycle it to ensure clean lubrication and greatly extend the service life of the friction pair.

[0063] 3. Balancer system: The balance cylinder 28 is fixed on the crossbeam 2, and the lower end of the piston rod 29 is connected to the slider 4 through the fixed seat 31. The high-pressure air chamber 30 in the lower chamber of the balance cylinder 28 continuously provides an upward lifting force to balance the weight of the moving parts, so that the transmission runs smoothly and reduces gap impact and energy loss.

[0064] 4. Integrated maintenance platform: A dedicated maintenance platform 32 is set up behind the press and outside the clutch 33, so that vulnerable parts such as clutch friction plates can be replaced safely and conveniently, which greatly improves the maintainability and uptime of the equipment.

[0065] Implementation Example

[0066] The following example, using the precision stamping of metal bipolar plates for hydrogen fuel cells, illustrates the application process and superior performance of the press of this invention.

[0067] Metal bipolar plates are the core components of hydrogen fuel cell stacks. They are usually made of stainless steel or titanium alloy sheets with a thickness of 0.1 mm. Their surfaces need to be formed with a micro-channel network with a large aspect ratio and complex shape. This process places extremely stringent requirements on the pressure equipment. It not only requires extremely high rigidity and repeatability, but also requires the slider to provide a sufficiently long and stable holding time at the bottom dead center so that the ultra-thin metal material can fully plastically flow and completely fill the mold cavity, avoiding springback, warping or cracking.

[0068] The press of the present invention is now used for operation. The operator drives the left worm gear box 14 and the right worm gear box 22 through the mold adjustment motor according to the mold height to precisely adjust the slider 4 to the predetermined mold installation height. Then, the hydraulic nut locking mechanism 21 is activated. The huge axial force generated by the high pressure oil chamber 15 instantly locks the threaded pair of the adjusting screw 13 and the adjusting nut 20 to a zero clearance state, ensuring that the closing height of the press remains constant from the first piece to the last piece. This is a prerequisite for achieving a bottom dead center repeatability accuracy of ±0.02mm.

[0069] After production starts, the electric motor 1 drives the flywheel 34 to store energy. After the clutch 33 engages, the power is transmitted to the left and right symmetrical elbow linkage mechanism through the absolutely synchronized longitudinal double crankshaft drive system. Under the control of the elbow linkage mechanism, the slider 4 moves with the characteristic curve of "slow approach, uniform pressure holding, and fast return". At the moment of stamping, the speed of the slider 4 has dropped to an extremely low level, and it enters the ultra-long pressure holding stage with a crankshaft rotation angle of more than 60° at full tonnage pressure. During this ample process time, the thin plate material can flow evenly and fully to every tiny corner of the mold, forming a flow channel with clear outline and precise dimensions.

[0070] Throughout the stamping process, the three-part pre-tightened frame and the guide post and guide sleeve auxiliary guiding system together form multiple closed high-rigidity force flows, which makes the deformation of the equipment extremely small when subjected to asymmetrical microchannel forming forces, thereby directly ensuring the uniformity of the flow channel depth and extremely high dimensional consistency of the bipolar plate.

[0071] The balancer 19 works continuously to ensure smooth operation with minimal impact and vibration; the thin oil circulating lubrication system ensures that all moving parts are in optimal working condition; when planned maintenance is required, the rear maintenance platform 32 makes tasks such as replacing the clutch 33 friction plates safe and efficient.

[0072] In summary, this embodiment demonstrates that the longitudinally mounted double-crankshaft elbow-type dual-point press with integrated intelligent monitoring, through its collaborative and innovative structural design, comprehensively addresses the core requirements of high-end precision forming equipment for high rigidity, high precision, long pressure holding time, high stability, and easy maintenance. It is particularly suitable for high-volume, high-quality production scenarios with stringent process requirements, such as metal bipolar plates for hydrogen fuel cells, fully demonstrating its technological advancement and strong industrial practical value.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A longitudinally mounted double-crankshaft elbow-type dual-point press with integrated intelligent monitoring, characterized in that, include: The machine frame, slider, transmission system, double crankshaft mechanism, toggle linkage mechanism, guide post and guide sleeve assembly, and mold adjustment and locking mechanism; The fuselage frame consists of crossbeams, columns, and a base connected by tension bolts to form a closed structure. The slider is disposed within the body frame, and its two sides slide in cooperation with the column guide rail; The transmission system includes an electric motor, a flywheel, a clutch, a drive shaft, a large gear, a first pinion, and a second pinion; The double crankshaft mechanism includes a first crankshaft and a second crankshaft placed longitudinally within a crossbeam, which rotate synchronously through gear meshing; The elbow linkage mechanism includes a main connecting rod, an upper elbow rod, and a lower elbow rod. One end of the main connecting rod is connected to the crankshaft, and the other end is hinged to the upper elbow rod and the lower elbow rod through a pin. The guide post and guide sleeve assembly includes a guide post and a guide sleeve disposed opposite to each other, wherein the guide post is connected to the slider and extends into the guide sleeve for movement; The mold adjustment locking mechanism is located inside the slider, connected to the adjusting screw, and can lock the threaded engagement.

2. The longitudinally mounted double-crankshaft elbow-type two-point press according to claim 1, characterized in that, The fuselage frame is a three-part structure, with positioning keys and positioning sleeves provided between the crossbeams, columns and base, and connected by applying pre-tightening force through tension bolts.

3. The longitudinally mounted double-crankshaft elbow-type two-point press according to claim 1, characterized in that, In the elbow linkage mechanism: The upper end of the upper elbow is hinged to the No. 1 pin fixed on the crossbeam; The lower end of the elbow is hinged to the No. 3 pin fixed on the guide post; The main connecting rod is connected to the upper and lower elbow rods via the No. 2 pin.

4. The longitudinally mounted double-crankshaft elbow-type dual-point press according to claim 1, characterized in that, In the transmission system: One end of the drive shaft is connected to the clutch, and the other end is equipped with a gear that meshes with a large gear; The first pinion meshes with the second pinion and is connected to the first crankshaft and the second crankshaft respectively via keys.

5. The longitudinally mounted double-crankshaft elbow-type two-point press according to claim 1, characterized in that, The mold adjustment and locking mechanism includes: a left worm gear box and a right worm gear box, an adjusting screw and a locking assembly; The left and right worm gear boxes are linked together by a connecting shaft. The adjusting screw is threadedly engaged with the adjusting nut. The locking assembly includes a locking nut and a hydraulic cylinder, with a high-pressure oil chamber formed between them.

6. The longitudinally mounted double-crankshaft elbow-type two-point press according to claim 1, characterized in that, It also includes the lubrication and oil return structure: The slider is equipped with a copper guide plate that mates with the column guide rail; A copper tile with an oil groove is provided between the guide post and the guide sleeve; An oil return box is installed below the column guide rail.

7. The longitudinally mounted double-crankshaft elbow-type double-point press according to claim 1, characterized in that, It also includes a balancer, whose balance cylinder is fixed on the crossbeam, the piston rod is connected to the slider, and the balance cylinder is equipped with a high-pressure air chamber.

8. The longitudinally mounted double-crankshaft elbow-type two-point press according to claim 1, characterized in that, It also includes a maintenance platform located behind the press, adjacent to the clutch.

9. The longitudinally mounted double-crankshaft elbow-type double-point press according to claim 1, characterized in that, It also includes an intelligent monitoring system, which includes an encoder for monitoring the crankshaft rotation phase, sensors for monitoring the load on the machine body, and a data acquisition interface.

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