A fine blanking machine powered by flywheel energy storage

Abstract

The present invention discloses a fine blanking machine that uses a flywheel energy storage method to provide power, belonging to the field of punching machine technology. The fine blanking machine includes a frame and a main punch mechanism, a fast-forward mechanism, a back-pressure mechanism, a side-holding mechanism, and an oil tank arranged on the frame. The main punch mechanism includes a main motor, a flywheel, a main power pump, and a main oil cylinder. The main power pump is connected to the oil tank. The back-pressure mechanism includes a back-pressure oil cylinder. The back-pressure cylinder barrel is connected to an upper work surface. The side-holding mechanism includes a side-holding oil cylinder and a lower work surface. The lower work surface is arranged corresponding to the upper work surface. The main oil cylinder is used to drive the back-pressure cylinder barrel to move from top to bottom, thereby driving the upper work surface to punch the workpiece on the lower work surface from top to bottom. The fast-forward mechanism includes a fast-forward oil cylinder and a guide rail. The present invention performs punching from top to bottom, and large-tonnage equipment does not require foundation construction. The main punch mechanism uses flywheel energy storage, which saves energy while also reducing the load on the entire power grid.

Description

Technical Field

[0001] The present invention belongs to the technical field of punching machines, and in particular relates to a fine punching machine which adopts a flywheel energy storage method to provide power. Background Art

[0002] Common fineblanking equipment is divided into two types based on the power source for the main punching process. For punching capacities under 200 tons, mechanical systems are generally used, while for punching capacities greater than 200 tons, fully hydraulic systems are generally used. The main punching portion consumes the most energy in both types of fineblanking machines. Mechanical fineblanking machines utilize a toggle-type mechanism to achieve fast, short-stroke punching. They feature a small tabletop, lightweight moving parts, and low inertia. Their advantages include high speed, high precision, and low noise. However, their small tabletop makes them unsuitable for complex, progressive die structures with smaller tonnage. Hydraulic fineblanking machines, with their larger tabletop and accumulators, are suitable for fineblanking large-tonnage, long-stroke products. However, they suffer from significant energy losses during non-operating conditions, high current peaks during motor startup, and relatively high noise levels during operation. Furthermore, most common fineblanking machines utilize a bottom-up mechanism where the main power source is located below the machine, resulting in a bulky substructure. Consequently, foundation construction is required during installation, with the substructure placed in a pit for easy access. Summary of the Invention

[0003] Technical problem: In view of the above problems existing in the prior art, the technical problem to be solved by the present invention is to provide a fine blanking machine powered by a flywheel energy storage method to reduce foundation construction and reduce the load on the power grid.

[0004] Technical solution: In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0005] A fine blanking machine using flywheel energy storage to provide power includes a frame and a main punch mechanism, a fast-forward mechanism, a back-pressure mechanism, a side-pressing mechanism and an oil tank arranged on the frame. The main punch mechanism includes a main motor, a flywheel connected to the main motor, a main power pump connected to the flywheel and a main oil cylinder connected to the main power pump. The main power pump is connected to the oil tank through a main pump oil suction pipe. The main oil cylinder includes a main cylinder barrel and a main cylinder piston. The back-pressure mechanism includes a back-pressure oil cylinder. The back-pressure oil cylinder includes a main cylinder piston. The back-pressure cylinder barrel and the back-pressure cylinder piston are connected by a plug, and the back-pressure cylinder barrel is connected to an upper working table. The edge pressing mechanism includes an edge pressing oil cylinder and a lower working table connected to the edge pressing oil cylinder. The lower working table is arranged corresponding to the upper working table. The main oil cylinder is used to drive the back-pressure cylinder barrel to move from top to bottom, and then drive the upper working table to punch the workpiece on the lower working table from top to bottom. The fast-forward mechanism includes a fast-forward oil cylinder connected to the back-pressure oil cylinder and a guide rail connected to the fast-forward oil cylinder.

[0006] Furthermore, a pressure-building relief valve is provided on the oil circuit connecting the main power pump and the main oil cylinder. In the no-load state, the pressure-building relief valve is in a power-off state. The main motor drives the flywheel to store energy, and the flywheel drives the main power pump to rotate without load. When the punching of the main oil cylinder begins, the pressure-building relief valve is energized, the main power pump is loaded, and the flywheel transfers the stored kinetic energy to the main power pump to provide the main oil cylinder with kinetic energy for punching. After the punching is completed, the pressure-building relief valve loses power, and the flywheel continues to store energy.

[0007] Furthermore, the fast-forward cylinder includes a fast-forward cylinder body and a fast-forward rod body, the fast-forward rod body is connected to a foreign object detection cylinder, the fast-forward rod body is provided with a detection oil channel connected to the fast-forward cylinder oil circuit, the detection oil channel is connected to the foreign object detection cylinder, and the foreign object detection cylinder oil circuit is provided with a detection pressure sensor and a detection overflow valve.

[0008] Furthermore, an ear block is connected to the side of the back-pressure cylinder barrel, the guide rail includes a sliding block and a fixed plate, the ear block is connected to the sliding block, and a pin hole block is connected to the foreign object detection cylinder, and the pin hole block is connected to the ear block.

[0009] Furthermore, the oil pressure of the foreign object detection cylinder oil circuit is greater than the oil pressure of the fast-forward cylinder oil circuit, and the detection oil channel is connected to the foreign object detection cylinder oil circuit through a detection one-way valve.

[0010] Furthermore, the oil tank is higher than the master oil cylinder, and the master oil cylinder is higher than the main power pump.

[0011] Furthermore, the detection pressure sensor is electrically connected to the pressure-building relief valve.

[0012] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0013] 1. The main oil cylinder is set above the frame and punches from top to bottom, so that large-tonnage fine-blanking machine equipment (main punching tonnage greater than 200 tons) can be placed directly on the ground without foundation construction. The oil tank is above the main power pump and the main oil cylinder, so that the overall liquid level is higher than the main power pump and the main oil cylinder, which is conducive to the rapid downward self-priming of the main oil cylinder to obtain hydraulic oil to ensure the high-speed operation of the main oil cylinder. In addition, the main oil cylinder and the main valve block are arranged above the equipment, which is convenient for daily quick maintenance to detect oil leaks.

[0014] 2. The main punch mechanism uses a flywheel to store energy. The pressure-building relief valve on the pipeline is used to provide the main cylinder with kinetic energy for punching, which greatly reduces the power of the main motor and the noise during operation. While saving energy, it also reduces the load on the entire power grid. The main cylinder only works in the last very short punching process during the entire punching cycle to ensure that the flywheel has sufficient energy storage time.

[0015] 3. By connecting a foreign object detection cylinder to the fast-forward cylinder, the oil circuit pressure of the foreign object detection cylinder is tested to detect foreign objects during the downward process, ensuring the safety of mold production. The smaller cylinder diameter of the foreign object detection cylinder can reduce the detection force and improve the detection sensitivity. Combined with the design of the downward movement of the main cylinder, the pressure detected by the foreign object detection cylinder is not interfered by the weight of the main cylinder, and the detection sensitivity is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the back structure of the present invention;

[0018] Figure 3 It is a schematic diagram of the internal structure of the front side of the present invention;

[0019] Figure 4 It is a schematic diagram of the internal structure of the back side of the present invention;

[0020] Figure 5 This is a schematic diagram of the fast-forward cylinder and guide rail structure;

[0021] Figure 6 It is a schematic diagram of the cross-sectional structure of the fast-forward oil cylinder;

[0022] Figure 7 This is a schematic diagram of the connection structure between the foreign body detection cylinder and the fast-forward cylinder;

[0023] Figure 8 This is a partial structural diagram of the main power pump hydraulic system;

[0024] Figure 9 It is a partial structural diagram of the hydraulic system of the foreign object detection cylinder. DETAILED DESCRIPTION

[0025] The present invention will be further illustrated below with reference to specific examples. The examples are implemented based on the technical solutions of the present invention. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0026] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, a fine blanking machine that uses a flywheel energy storage method to provide power is hydraulic, and the main blanking tonnage reaches 300 tons. The fine blanking machine includes a frame 1 and a main punching mechanism, a fast-forward mechanism, a back-pressure mechanism, a side-holding mechanism 5 and an oil tank 6 arranged on the frame 1. The oil tank 6 is arranged above the rear side of the frame 1. The main punching mechanism includes a main motor 21, a flywheel 22, a main power pump 23 and a main oil cylinder 24. The main motor 21 is arranged in the middle position of the rear side of the frame 1, and the flywheel 22 is arranged below one end of the frame 1 and is located in the protective cover. The flywheel 22 is connected to the main motor 21 through a belt 211. The main power pump 23 is arranged at the other end of the rear side of the frame 1 opposite to the flywheel 22. The main power pump 23 is connected to the flywheel 22 through a transmission shaft 221. The main power pump 23 and the flywheel 22 are at the same height. The main power pump 23 is connected to the oil tank 6 through a main pump oil suction pipe 231.

[0027] like Figure 1 and Figure 3 As shown, the master cylinder 24 is arranged above the front side of the frame 1, the oil tank 6 is higher than the master cylinder 24, the master cylinder 24 is higher than the main power pump 23, the master cylinder 24 is connected to the main power pump 23 through an oil pipe, and the hydraulic oil can quickly enter the cylinder through the self-priming of the master cylinder 24. The master cylinder 24 adopts a plunger structure and is provided with a limited position hanging platform. The master cylinder 24 includes a master cylinder barrel 241 and a master cylinder piston 242. Under the action of hydraulic pressure, the master cylinder piston 242 reciprocates up and down.

[0028] like Figure 3 As shown, the back-pressure mechanism includes a back-pressure cylinder 41, which is used to provide one of the three-way pressure for fine stamping during the stamping process, ensuring that there is always a back-pressure on the back of the part to provide support during the stamping process to provide hydrostatic pressure to reduce the variable in the thickness direction. The back-pressure cylinder 41 includes a back-pressure cylinder barrel 411 and a back-pressure cylinder piston 412. The back-pressure cylinder barrel 411 is connected to the main cylinder piston 242. The back-pressure cylinder barrel 411 is connected to an upper working table 91, and the upper working table 91 is connected to the lower end face of the back-pressure cylinder barrel 411. There is an upper mold part of the mold on the upper working table 91, and the upper mold part is a concave mold. The hydraulic oil of the hydraulic system part of the back-pressure cylinder 41 comes from the oil tank 6, and adopts the existing hydraulic pipeline structure, including a motor, an accumulator, a switch valve, a safety valve, a pressure regulating valve, etc.

[0029] like Figure 3As shown, the edge holding mechanism 5 includes an edge holding cylinder 51 and a lower work surface 92. The edge holding cylinder 51 is used to provide one of the three forces in fine blanking, providing rib pressing and plate surface pressing during fine blanking, and providing hydrostatic pressure for fine blanking to reduce deformation in the thickness direction of the plate surface. The edge holding cylinder 51 includes an edge holding cylinder barrel 511 and an edge holding cylinder piston 512. The edge holding cylinder barrel 511 is arranged at the lower front side of the frame 1. The lower work surface 92 is connected to the upper end surface of the edge holding cylinder barrel 511 and corresponds to the position of the upper work surface 91. The lower work surface 92 has the lower die part of the mold, which is a punch. The hydraulic oil of the hydraulic system of the edge holding cylinder 51 comes from the oil tank 6, and adopts the existing hydraulic pipeline structure, including a motor, an accumulator, a switch valve, a safety valve, a pressure regulating valve, etc. The edge holding cylinder 51 is also responsible for providing the ejection force of the workpiece after blanking.

[0030] like Figure 1 and Figure 3 As shown, the fast-forward mechanism includes two fast-forward oil cylinders 31 and two guide rails 32. The two fast-forward oil cylinders 31 are arranged on both sides of the frame 1. The fast-forward oil cylinder 31 includes a fast-forward cylinder body 311 and a fast-forward rod body 312. Support blocks 15 are provided on both sides of the frame 1. The fast-forward cylinder body 311 is fixedly connected to the support blocks 15. Ear blocks 33 are respectively connected to the two sides of the back-pressure cylinder barrel 411. The fast-forward rod body 312 is connected to the ear blocks 33. When the fast-forward rod body 312 moves downward rapidly, it drives the back-pressure cylinder barrel 411 and the main cylinder piston 242 to move downward, thereby driving the upper working table 91 to move downward. The guide rail 32 adopts the existing eight-sided guide rail, including a sliding block 321 and a fixed plate 322. The ear block 33 is connected to the sliding block 321. The guide rail 32 is used to limit the up and down movement position of the ear block 33, thereby improving the up and down movement accuracy of the upper working table 91. Part of the hydraulic oil of the hydraulic system of the fast-forward cylinder 31 comes from the oil tank 6 and adopts the existing hydraulic pipeline structure, including a motor, accumulator, proportional reversing valve, balancing valve, foreign object detection oil circuit, and pressure sensor. The hydraulic system of the fast-forward cylinder 31 provides power for the rapid up and down process of the main cylinder 24. The diameter of the oil port passage is controlled by the proportional reversing valve to control the fast and slow movement process of the fast-forward cylinder 31, which can reduce the working time of the main cylinder, reduce equipment vibration and increase working frequency.

[0031] When the upper work surface 91 rapidly descends to the predetermined position, the main oil cylinder 24 drives the counter-pressure cylinder barrel 411 downward, thereby driving the upper work surface 91 downward to punch the workpiece on the lower work surface 92, completing the workpiece processing. The main valve block of the entire hydraulic system of the equipment is located above the frame for easy maintenance.

[0032] like Figure 8As shown, the main power pump 23 is connected to the main oil cylinder 24 through the first oil pipe 821 and the second oil pipe 822 (the oil pipe from the second oil pipe 822 to the middle of the main oil cylinder 24 and the switch valve, pressure relief valve and liquid filling valve on the oil pipe use existing equipment and pipeline structures, which are omitted in the figure). The first oil pipe 821 is connected to a pressure-building relief valve 81, which includes a pressure-building switch valve 811 for selecting whether to build pressure. The pressure-building relief valve 81 is connected to the oil tank 6 through a third oil pipe 83. In the no-load state, the pressure-building relief valve 81 is in a power-off state. When the pressure-building switch valve 811 is power-off, the pressure-building relief valve 81 is in a pressure-releasing state. The pressure-building relief valve 81 is in a power-off state. At this time, in the connected state, the oil in the master cylinder 24 can be driven by the fast-forward cylinder 31 to drive the master cylinder piston 242 to move and be self-sucked into the oil tank 6. The main motor 21 drives the flywheel 22 to store energy, and the flywheel 22 drives the main power pump 23 to rotate without load. When the master cylinder 24 starts punching, the pressure-building relief valve 81 is energized, and the pressure-building switch valve 811 is energized. The pressure-building relief valve 81 is now in the pressure-building state. The pressure-building relief valve 81 is disconnected, and the main power pump 23 is loaded. The flywheel 22 transfers the stored kinetic energy to the main power pump 23, providing the main cylinder 24 with kinetic energy for punching. After punching is completed, the pressure-building relief valve 81 is de-energized, and the flywheel 22 continues to store energy.

[0033] like Figure 5 、 Figure 6 、 Figure 7 and Figure 9As shown, the lower end of the fast-forward rod body 312 of the fast-forward oil cylinder 31 is connected to the foreign object detection oil cylinder 35, and the foreign object detection oil cylinder 35 includes a detection cylinder barrel 351 and a detection piston 352. The detection piston 352 is connected to the fast-forward rod body 312, and the detection cylinder barrel 351 is connected to the pin hole block 34. The pin hole block 34 is connected to the ear block 33. A detection oil channel 3121 connected to the oil circuit of the fast-forward oil cylinder 31 is provided in the fast-forward rod body 312. A detection one-way valve 3122 is also provided at the lower end of the detection oil channel 3121. The detection oil channel 3121 is connected to the oil circuit of the foreign object detection oil cylinder 35 through the detection one-way valve 3122. A detection pressure sensor 36 and a detection pressure sensor 36 are provided on the oil circuit of the foreign object detection oil cylinder 35. Detect overflow valve 37, the stroke of foreign object detection cylinder 35 is 5mm, the cylinder diameter of foreign object detection cylinder is smaller than the cylinder diameter of fast forward cylinder 31, the oil inside foreign object detection cylinder 35 enters the cylinder body of foreign object detection cylinder 35 through the hydraulic oil in fast forward cylinder body 311 through detection oil channel 3121 and detection one-way valve 3122, the detection overflow valve 37 on the oil line of detection cylinder 35 is 1Mpa higher than the oil of fast forward cylinder 31 system after pressure adjustment, when the fast forward rod body 312 moves downward, the hydraulic oil in fast forward cylinder body 311 is compensated to the cylinder of foreign object detection cylinder 35, and the detection one-way valve 3122 can prevent the oil in the cylinder of foreign object detection cylinder 35 from flowing back to the cylinder of fast forward cylinder 31 during the downward process. When the fast-forward oil cylinder 31 brings the upper work table 91 downward and contacts a foreign object, the oil in the detection cylinder will squeeze out the oil before the normal mold closing position set by the system and cause the pressure in the foreign object detection oil cylinder 35 to increase. At this time, the detection pressure sensor 36 set detects the pressure increase signal, and the detection pressure sensor 36 sends a signal to the fine blanking machine control system. The control system is electrically connected to the pressure-building switch valve 811 of the pressure-building relief valve 81 and controls its operation. The signal of the detection pressure sensor 36 is added to the condition for the pressure-building switch valve 811 to be energized. When the pressure exceeds During stamping, the main oil cylinder 24 does not perform pressurizing action, that is, the pressure-building switch valve 811 is not energized, and the control system stops the subsequent pressurizing action of the main oil cylinder 24. If no foreign matter is detected, the pressure in the foreign matter detection cylinder 35 does not increase and does not reach the alarm pressure before the normal mold closing position. Thereafter, the main oil cylinder 24 and the fast-forward oil cylinder 31 continue to descend. At this time, the pressure in the detection cylinder is not used as the alarm pressure monitoring input. After the stamping process is completed, the fast-forward rod 312 moves upward. During this process, the foreign matter detection oil cylinder 35 can self-prime and replenish oil through the detection oil channel 3121 and the detection one-way valve 3122. By utilizing the smaller diameter of the foreign object detection cylinder 35, the detection force can be reduced and the detection sensitivity can be improved. Since the main cylinder 24 is arranged at the top, the fast-forward cylinder 31 and the foreign object detection cylinder 35 are always in a hoisting state under the weight of the piston of the main cylinder 24. Different from the existing upward operation form of the main cylinder (the existing structure has interference due to the weight and inertia of the main cylinder plus contact with foreign objects), there is no interference from the weight of the main cylinder. It is equivalent to the pressure in the foreign object detection cylinder 35 being the pressure when the mold contacts the object, which makes the detection sensitivity higher.

[0034] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A fine blanking machine powered by a flywheel energy storage method, characterized in that: The invention comprises a frame (1) and a main thrust mechanism, a fast-forward mechanism, a back-pressure mechanism, a side-pressing mechanism (5) and an oil tank (6) arranged on the frame (1); the main thrust mechanism comprises a main motor (21), a flywheel (22) connected to the main motor (21), a main power pump (23) connected to the flywheel (22), and a main oil cylinder (24) connected to the main power pump (23); the main power pump (23) is connected to the oil tank (6) via a main pump oil suction pipe (231); the main oil cylinder (24) comprises a main cylinder barrel (241) and a main cylinder piston (242); the back-pressure mechanism comprises a back-pressure oil cylinder (41); the back-pressure oil cylinder (41) comprises a back-pressure cylinder connected to the main cylinder piston (242); The back-pressure cylinder (411) and the back-pressure cylinder piston (412) are connected to an upper working table (91). The edge pressing mechanism (5) includes an edge pressing oil cylinder (51) and a lower working table (92) connected to the edge pressing oil cylinder (51). The lower working table (92) is arranged corresponding to the upper working table (91). The main oil cylinder (24) is used to drive the back-pressure cylinder (411) to move from top to bottom, thereby driving the upper working table (91) to punch the workpiece on the lower working table (92) from top to bottom. The fast-forward mechanism includes a fast-forward oil cylinder (31) connected to the back-pressure oil cylinder (41) and a guide rail (32) connected to the fast-forward oil cylinder (31).

2. The fine blanking machine powered by flywheel energy storage according to claim 1, characterized in that: A pressure-building relief valve (81) is provided on the oil circuit connecting the main power pump (23) and the main oil cylinder (24). In a no-load state, the pressure-building relief valve (81) is in a power-off state. The main motor (21) drives the flywheel (22) to store energy, and the flywheel (22) drives the main power pump (23) to rotate without load. When the main oil cylinder (24) starts to punch, the pressure-building relief valve (81) is energized, the main power pump (23) is loaded, and the flywheel (22) transfers the stored kinetic energy to the main power pump (23), providing the main oil cylinder (24) with kinetic energy for punching. After the punching is completed, the pressure-building relief valve (81) is de-energized, and the flywheel (22) continues to store energy.

3. The fine blanking machine powered by flywheel energy storage according to claim 2, characterized in that: The fast-forward oil cylinder (31) comprises a fast-forward cylinder body (311) and a fast-forward rod body (312). A foreign matter detection oil cylinder (35) is connected to the fast-forward rod body (312). A detection oil passage (3121) connected to the oil passage of the fast-forward oil cylinder (31) is provided in the fast-forward rod body (312). The detection oil passage (3121) is communicated with the foreign matter detection oil cylinder (35). A detection pressure sensor (36) and a detection overflow valve (37) are provided on the oil passage of the foreign matter detection oil cylinder (35).

4. The fine blanking machine powered by flywheel energy storage according to claim 3, characterized in that: The side of the counter-pressure cylinder barrel (411) is connected to an ear block (33); the guide rail (32) includes a sliding block (321) and a fixed plate (322); the ear block (33) is connected to the sliding block (321); the foreign matter detection oil cylinder (35) is connected to a pin hole block (34); and the pin hole block (34) is connected to the ear block (33).

5. The fine blanking machine powered by flywheel energy storage according to claim 4, characterized in that: The oil pressure of the oil circuit of the foreign object detection oil cylinder (35) is greater than the oil pressure of the oil circuit of the fast-forward oil cylinder (31), and the detection oil channel (3121) is connected to the oil circuit of the foreign object detection oil cylinder (35) via a detection one-way valve (3122).

6. The fine blanking machine powered by flywheel energy storage according to claim 1, characterized in that: The oil tank (6) is higher than the main oil cylinder (24), and the main oil cylinder (24) is higher than the main power pump (23).

7. The fine blanking machine powered by flywheel energy storage according to claim 3, characterized in that: The detection pressure sensor (36) is electrically connected to the pressure-building relief valve (81).

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