Alternating current servo motor driven flywheel screw compression nitrogen energy storage type super high speed bar stock precision shearing equipment

Abstract

The application discloses an AC servo motor driven flywheel spiral nitrogen gas compressed energy type super-speed bar material precision shearing equipment, which comprises a frame structure, wherein a high-pressure gas chamber mechanism, a hammer head movement mechanism and a die are arranged on the frame structure from top to bottom; the high-pressure gas chamber mechanism cooperates with the hammer head movement mechanism to strike the die, and the bar material is cut off and separated under the action of the die; the complicated hydraulic drive system is omitted; the flywheel spiral nitrogen gas compressed energy mode is adopted to realize the super-speed striking (20m / s-30m / s) of the hammer head; the control is simple, the hammer head return speed is fast, and the energy utilization rate is high.

Description

Technical Field

[0001] This invention belongs to the field of high-speed metal bar shearing technology, specifically designing an ultra-high-speed precision shearing device for bars that uses an AC servo motor-driven flywheel spiral compression nitrogen energy storage. Background Technology

[0002] Currently, the most common high-speed precision shearing equipment for bar stock is the hydraulic-pneumatic hammer (Dong Yuanzhe. Research on the separation mechanism and dynamic fracture mechanics behavior of high-speed and low-energy composite precision shearing of metal bars [D]. Xi'an: Xi'an Jiaotong University, 2020). Its structural principle is that a high-pressure gas chamber is installed above the equipment, and the piston and the moving shear blade are fixedly connected in the high-pressure gas chamber; the metal bar is placed below the moving shear blade and is clamped in a hydraulic clamping mold; its working principle is that the high-pressure gas pushes the piston rod downward, and the piston rod drives the shear blade to shear the bar stock. This type of equipment has the following disadvantages: 1) The piston driven by the hydraulic pump station compresses the gas to store energy, the hydraulic system is complex, the energy utilization rate is low, the price is expensive, and the control is difficult; 2) The hammer speed during the shearing process is less than 10m / s, which cannot reach the strain rate required for the ductile-brittle transition of the material, and the active load required for shearing is large. Summary of the Invention

[0003] To overcome the shortcomings of the above-mentioned technologies, the present invention aims to provide an ultra-high-speed precision shearing device for bar stock that uses an AC servo motor-driven flywheel spiral compression nitrogen energy storage system. This eliminates the need for a complex hydraulic drive system and achieves ultra-high-speed hammer impact (20m / s to 30m / s) through flywheel spiral compression nitrogen energy storage. The device features simple control, fast hammer return speed, and high energy utilization.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] An ultra-high-speed precision shearing device for bar stock, driven by an AC servo motor and using a flywheel spiral compression nitrogen storage system, includes a frame structure. The frame structure is equipped with a high-pressure air chamber mechanism, a hammer movement mechanism, and a die 40 from top to bottom. The high-pressure air chamber mechanism works in conjunction with the hammer movement mechanism to strike the die 40, and the bar stock is cut and separated under the action of the die 40.

[0006] The frame structure is composed of an upper crossbeam 30, a lower crossbeam 12, and a column 5. A tensioning screw 28 is installed inside the column 5. An upper crossbeam super nut 29 is arranged on the upper surface of the upper crossbeam 30, and the upper end of the upper crossbeam super nut 29 is connected to the upper end of the tensioning screw 28. Lower crossbeam super nuts 33 are symmetrically arranged on the inner side partition of the lower crossbeam 12, and the lower end of the lower crossbeam super nut 33 is connected to the lower end of the tensioning screw 28.

[0007] The high-pressure air chamber mechanism includes servo motors 3 connected to both sides of the upper crossbeam 30. A small gear 43 mounted on the output shaft of the servo motor 3 meshes with a flywheel 44. The flywheel 44 is connected to the main screw 21. The main screw 21 is installed in the middle cylinder 4 of the upper crossbeam through a support sleeve 1, a one-way thrust cylindrical roller bearing 15, a single-row cylindrical roller bearing 17, and a screw lower baffle 19. The main screw 21 is connected to the main nut 20. The main nut 20 is connected to the hammer body connecting end cap 6 and the screw. The female sleeve 22 is fixedly connected, the nut sleeve 22 is connected to the upper surface of the upper slide plate 8, the protruding part of the lower surface of the upper slide plate 8 is engaged with the inner ring of the main cylinder barrel 24, the main cylinder barrel 24 is coaxially engaged with the cylinder piston 26, the cylinder piston 26 is coaxially engaged with the cylinder copper sleeve 25, the cylinder copper sleeve 25 is fixedly connected to the upper slide plate 8 through the cylinder tension screw 31, the two sides of the upper slide plate 8 are fixedly connected with the slider 7, the slider 7 is slidably engaged with the guide rail 11, and the guide rail 11 is symmetrically installed on the two side columns 5;

[0008] The upper slide plate 8, cylinder barrel 24, cylinder piston 26 and cylinder bushing 25 are connected by the cylinder tensioning screw 31 to form a high-pressure gas chamber, which is filled with nitrogen.

[0009] The hammerhead movement mechanism includes first pulleys 34 symmetrically installed on both sides of the upper slide plate 8. The first pulleys 34 are connected by belts 35, second pulleys 37 and third pulleys 36. The second pulleys 37 are symmetrically installed on both sides of the hammerhead 9. The third pulleys 36 are fixedly installed on the column 5. Locking devices 39 symmetrically installed on the front and rear sides of the column 5 are connected to the piston part of the hydraulic cylinder 10 through locking device support plates 32. The hydraulic cylinder 10 is fixedly installed on the left and right sides of the column 5. The hydraulic cylinder 10 is connected to the hydraulic pump station 42 through hydraulic valves 27 and oil pipes 41.

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] 1) By using an AC permanent magnet servo synchronous motor to drive a flywheel screw to convert nitrogen gas for energy storage, the energy utilization rate is significantly higher than that of hydraulic transmission.

[0012] 2) The initial pressure in the high-pressure chamber before gas compression can reach 1-5 MPa, and the pressure after energy storage can reach more than 10 MPa, which can achieve huge energy storage. After the energy is released, the hammer can achieve a higher speed of impact (20m / s-30m / s), so that the bar can be cut and separated at the strain rate required for the ductile-brittle transition, reducing the active shear load required by the equipment and improving the cross-sectional quality. Attached Figure Description

[0013] Figure 1 This is the front view of the present invention.

[0014] Figure 2 This is a left view of the present invention and a schematic diagram of its connection with a hydraulic pump station.

[0015] Figure 3 This is a top view of the present invention. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings.

[0017] Reference Figure 1 , Figure 2 and Figure 3 An ultra-high-speed precision shearing device for bar stock, driven by an AC servo motor and using a flywheel spiral compression nitrogen storage system, includes a frame structure. The frame structure is equipped with a high-pressure air chamber mechanism, a hammer movement mechanism, and a mold 40 from top to bottom. The high-pressure air chamber mechanism works in conjunction with the hammer movement mechanism to strike the mold 40, and the bar stock is cut and separated under the action of the mold 40.

[0018] The frame structure is composed of an upper crossbeam 30, a lower crossbeam 12, and a column 5. A tensioning screw 28 is installed inside the column 5. Two sets of upper crossbeam super nuts 29 are arranged on the upper surface of the upper crossbeam 30, and the upper ends of the upper crossbeam super nuts 29 and tensioning screw 28 are connected. Two sets of lower crossbeam super nuts 33 are symmetrically arranged on the inner side partition of the lower crossbeam 12, and the lower ends of the lower crossbeam super nuts 33 and tensioning screw 28 are connected.

[0019] The high-pressure air chamber mechanism includes four servo motors 3 fixedly connected to both sides of the upper crossbeam 30 via motor supports 2. A pinion 43 mounted on the output shaft of each servo motor 3 meshes with a flywheel 44. The flywheel 44 is connected to the main screw 21 via an adjusting flange 13. The main screw 21 is installed in the intermediate cylinder 4 of the upper crossbeam via a support sleeve 1, an upper cover 14 of the crossbeam, a one-way thrust cylindrical roller bearing 15, an upper cover 16 of the thrust bearing, a single-row cylindrical roller bearing 17, a thrust bearing seat 18, and a lower screw baffle 19. The main screw 21 and the main nut 20 are connected... The main nut 20 is fixedly connected to the hammer body connecting end cover 6 and the nut sleeve 22. The nut sleeve 22 is connected to the upper surface of the upper slide plate 8 through the flange 23. The protruding part of the lower surface of the upper slide plate 8 is engaged with the inner ring of the main cylinder barrel 24. The main cylinder barrel 24 and the cylinder piston 26 are coaxially engaged. The cylinder piston 26 and the cylinder copper sleeve 25 are coaxially engaged. The cylinder copper sleeve 25 is fixedly connected to the upper slide plate 8 through the cylinder tensioning screw 31. The two sides of the upper slide plate 8 are fixedly connected to the slider 7. The slider 7 and the guide rail 11 are slidably engaged. The guide rail 11 is symmetrically installed on the two side columns 5.

[0020] The upper slide plate 8, cylinder barrel 24, cylinder piston 26 and cylinder bushing 25 are connected by the cylinder tensioning screw 31 to form a high-pressure gas chamber, which is filled with nitrogen.

[0021] The hammerhead movement mechanism includes four first pulleys 34 symmetrically installed on both sides of the upper slide plate 8. The first pulleys 34 are connected by a belt 35, a second pulley 37, and a third pulley 36. The second pulleys 37 are symmetrically installed on both sides of the hammerhead 9. The third pulleys 36 are fixedly installed on the column 5. Four locking device support seats 38 are symmetrically installed on the front and rear sides of the column 5. The locking device support seats 38 and the locking device support plates 32 are coaxially engaged. The locking devices 39 connected to the locking device support seats 38 are connected to the piston part of the hydraulic cylinder 10 through the locking device support plates 32. The hydraulic cylinder 10 is fixedly installed on the left and right sides of the column 5. The hydraulic cylinder 10 is connected to the hydraulic pump station 42 through the hydraulic valve 27 and the oil pipe 41.

[0022] The working principle of this invention is as follows:

[0023] This invention utilizes the characteristic of metallic materials where toughness decreases and brittleness increases at high strain rates. Four servo motors 3 drive a pinion 43 to rotate a flywheel 44, which in turn rotates the main screw 21. The main screw 21 is limited by the lower screw baffle 19 and cannot move vertically. The main nut 20 moves downwards under the rotational engagement of the main screw 21. The nut sleeve 22 is fixed to the main nut 20 and moves downwards along with it. The high-pressure chamber, composed of the upper slide plate 8, cylinder barrel 24, cylinder piston 26, and cylinder copper sleeve 25 connected by a cylinder tensioning screw 31, is filled with nitrogen. The high-pressure chamber moves downwards along with the nut sleeve 22. When the cylinder piston 26 contacts the hammer head 9, the hammer head 9 is limited by the locking device support plate 32 and cannot move downwards. The cylinder piston 26, obstructed, moves upwards relative to the cylinder barrel 24, compressing the nitrogen in the high-pressure chamber and causing a rapid increase in internal pressure. When the pressure in the high-pressure chamber reaches the designed critical value, hydraulic oil is controlled by hydraulic valve 27, and hydraulic oil enters hydraulic cylinder 10 from pump station 42 along oil pipe 41. The piston of hydraulic cylinder 10 drives locking device support plate 32 and locking device 39 to move outward of column 5. Locking device support plate 32 is pulled away, and hammer 9 moves at high speed towards shearing die 40 under the push of cylinder piston 26. At this time, the pressure energy in the high-pressure chamber is converted into the kinetic energy of hammer 9. Under the combined action of gravity, the speed of hammer 9 reaches 20m / s to 30m / s. Hammer 9 strikes the moving shear block of die 40, and the bar is cut and separated under the action of the moving shear block.

[0024] The first pulley 34, belt 35, second pulley 37, and third pulley 36 form a movable pulley pair. During the falling process of the hammer 9, the belt 35 moves downward driven by the second pulley 37 which is fixed to the hammer 9. According to the characteristics of the movable pulley pair, the belt 35 is always in a slack state during this process, ensuring that the hammer 9 can fall freely.

[0025] During the return stroke, the four servo motors 3 drive the pinion 43 to rotate in the opposite direction, and simultaneously drive the flywheel 44 to rotate in the opposite direction; the main screw 21 rotates in the opposite direction under the drive of the flywheel 44, and the main nut 20, nut sleeve 22 and high-pressure air chamber move upward; the first pulley 34, which is fixed to the upper slide plate 8, moves upward, while the third pulley 36 remains stationary, thus driving the second pulley 37 and hammer 9 to move upward; the hammer 9 leaves the upper surface of the shearing die 40 and returns to the initial position before impact. At this time, the four servo motors 3 stop rotating, and the hammer 9 stops moving; the hydraulic valve 27 reverses, and the piston of the hydraulic cylinder 10 drives the locking device support plate 32 and the locking device support plate 39 to move inward toward the column 5. The locking device support plate 39 moves to directly below the hammer 9, supporting the hammer 9.

Claims

1. A high-speed precision bar shearing device driven by an AC servo motor and using a flywheel spiral compression nitrogen energy storage system, comprising a frame structure, characterized in that: The frame structure is equipped with a high-pressure air chamber mechanism, a hammer movement mechanism, and a mold (40) from top to bottom. The high-pressure air chamber machine works in conjunction with the hammer movement mechanism to strike the mold (40), and the bar stock is cut and separated under the action of the mold (40). The frame structure is composed of an upper crossbeam (30), a lower crossbeam (12), and a column (5); a tensioning screw (28) is provided inside the column (5); an upper crossbeam super nut (29) is arranged on the upper surface of the upper crossbeam (30); the upper crossbeam super nut (29) is connected to the upper end of the tensioning screw (28); lower crossbeam super nuts (33) are symmetrically arranged on the inner side partition of the lower crossbeam (12); the lower crossbeam super nuts (33) are connected to the lower end of the tensioning screw (28). The high-pressure air chamber mechanism includes servo motors (3) connected to both sides of the upper crossbeam (30). A small gear (43) and a flywheel (44) are meshed on the output shaft of the servo motor (3). The flywheel (44) is connected to the main screw (21). The main screw (21) is installed in the middle cylinder (4) of the upper crossbeam through a support sleeve (1), a one-way thrust cylindrical roller bearing (15), a single-row cylindrical roller bearing (17), and a screw lower baffle (19). The main screw (21) is connected to the main nut (20). The main nut (20) is connected to the hammer body connecting end cap (6) and the nut. The sleeve (22) is fixedly connected, the nut sleeve (22) is connected to the upper surface of the upper slide plate (8), the protruding part of the lower surface of the upper slide plate (8) is engaged with the inner ring of the main cylinder barrel (24), the main cylinder barrel (24) and the cylinder piston (26) are coaxially engaged, the cylinder piston (26) and the cylinder copper sleeve (25) are coaxially engaged, the cylinder copper sleeve (25) is fixedly connected to the upper slide plate (8) through the cylinder tension screw (31), the upper slide plate (8) is fixedly connected to the slider (7) on both sides, the slider (7) and the guide rail (11) are slidably engaged, and the guide rail (11) is symmetrically installed on the two side columns (5); The upper slide plate (8), the main cylinder barrel (24), the cylinder piston (26) and the cylinder bushing (25) are connected by the cylinder tensioning screw (31) to form a high-pressure air chamber; The hammer movement mechanism includes a first pulley (34) symmetrically installed on both sides of the upper slide plate (8). The first pulley (34) is connected to the second pulley (37) and the third pulley (36) via a belt (35). The second pulley (37) is symmetrically installed on both sides of the hammer (9). The third pulley (36) is fixedly installed on the column (5). The locking device (39) symmetrically installed on the front and rear sides of the column (5) is connected to the piston part of the hydraulic cylinder (10) via the locking device support plate (32). The hydraulic cylinder (10) is fixedly installed on the left and right sides of the column (5). The hydraulic cylinder (10) is connected to the hydraulic pump station (42) via the hydraulic valve (27) and the oil pipe (41).

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