Intelligent control system of double-disc friction screw press

Abstract

An intelligent control system of a double-disc friction screw press comprises a friction disc electro-hydraulic control clutch mechanism, a sliding block electro-hydraulic control brake mechanism and a control system, the friction disc electro-hydraulic control clutch mechanism controls clutch of a friction disc and a flywheel, and the sliding block electro-hydraulic control brake mechanism controls braking of a sliding block. The control system achieves intelligent control of the friction disc electro-hydraulic control clutch mechanism and the sliding block electro-hydraulic control brake mechanism. Under the condition that the existing structure of the double-disc screw press is not changed, the change of the up-and-down movement direction of the sliding block of the screw press is intelligently controlled, and the function of braking at any time is achieved, so that the energy-saving, efficient, intelligent and automatic control of the double-disc friction screw press is achieved; adaptive learning can be carried out under various working conditions to obtain appropriate technological parameters, and efficient and high-quality machining is completed.

Description

Technical Field

[0001] The invention belongs to the technical field of double-disc friction screw presses in forging equipment, and in particular relates to an intelligent control system of a double-disc friction screw press. Background Art

[0002] The double-disc friction screw press is a machine that rotates the double friction discs on the top left and right, and drives the flywheel to rotate in different directions through their respective friction end faces. The screw rotation screw pair that is fastened to the flywheel is converted into a drive for the slider of the press to reciprocate up and down to complete the task of forging the workpiece. Because there is no analog sensor involved in the forward and reverse movement of the screw, flexible automatic control cannot be achieved, resulting in large impact vibration noise, serious energy waste, poor working reliability, and insufficient safety. However, its market share is still large and it is still widely used in automobiles, railways, engineering machinery, aerospace and other fields. Therefore, it has become an urgent problem to transform and upgrade the current backward traditional double-disc friction screw press.

[0003] The common double-disc friction screw presses currently generally rotate the two friction discs on the top, contacting the friction middle flywheel respectively to rotate the flywheel and drive the screw rod to rotate, so that the slider completes the up and down movement, and the slider completes the forging work. In this process, the clutch of the left and right friction discs drives the reversing valve through the manual handle to complete the drive of the operating cylinder, and the main shaft of the friction disc is moved by the lever to change the contact relationship between the friction disc and the flywheel. Because the two friction discs have the same direction of rotation, when they contact the flywheel respectively, they will change the rotation direction of the flywheel and complete the change of the movement direction.

[0004] When braking is required, the current double-disc friction screw press uses a brake device placed on the upper part of the slider to complete the braking. The principle of the braking device is to use a brake ramp fixed on the machine body to push the brake rod. When the slider moves to near the top dead center, the brake ramp pushes the brake rod so that the rotating plate at one end of the band brake tightens the brake steel belt with friction material, and the friction belt on the steel belt holds the brake friction wheel on the left-rotating screw to complete the braking of the screw rotation. The kinetic energy of the rotating screw and flywheel, as well as the slider and upper mold in linear motion, is converted into friction heat on the brake friction surface, and finally the slider stops moving to the top dead center. Therefore, when changing the slider to stop at different positions near the top dead center, it is necessary to repeatedly adjust the up and down positions of the brake ramp fixed on the machine body and the left and right moving hydraulic reversing valves of the two friction discs on the top of the equipment to achieve the position of the clutch ramp on the machine body for reversing, so as to adjust the contact time and position of the friction disc and the flywheel, which is laborious to operate.

[0005] The existing double-disc friction screw press slider is not equipped with an analog sensor for online automatic detection of slider displacement and speed, so the slider cannot be started and stopped at any position; in particular, the kinetic energy of the flywheel and the slider cannot be adaptively controlled according to the different requirements of the deformation force and kinetic energy of the workpiece.

[0006] In summary, the existing double-disc friction screw press has the following problems:

[0007] 1) The double friction discs on the top of the screw press move left and right to realize the forward and reverse rotation of the screw press flywheel, so that the upward and downward control of the slider is rigid, which often causes the deformation of small-sized workpieces to use the maximum slider stroke and deformation work. That is to say, the force and work provided each time are too large, and adaptive control cannot be achieved, resulting in serious energy waste, excessive impact, vibration and noise during processing, and short mold life.

[0008] 2) The existing belt brake uses a triangular rigid plate and a fast braking inclined plate fixed on the machine body, which causes the screw press to be braked only near the top dead center position and cannot be braked at any position. In addition, the braking force cannot be adjusted during the braking process according to the absorbed kinetic energy, resulting in serious energy waste during the braking process, reduced working reliability, serious wear of friction materials and a short service life.

[0009] 3) The existing double-disc friction press slider is not equipped with a dynamic analog sensor that can automatically monitor the speed and displacement changes online, so it is impossible to implement intelligent adaptive control of the screw press according to the plastic deformation force and energy required by different workpieces. Summary of the invention

[0010] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide an intelligent control system for a double-disc friction screw press, which can intelligently control the change of the up and down movement direction of the slider of the screw press without changing the existing structure of the double-disc screw press, and realize the function of braking at any time, thereby realizing energy-saving, efficient and intelligent automatic control of the double-disc friction screw press.

[0011] In order to achieve the above object, the technical solution adopted by the present invention is:

[0012] An intelligent control system for a double-disc friction screw press comprises a friction disc electro-hydraulic control clutch mechanism, a slider electro-hydraulic control brake mechanism and a control system. The friction disc electro-hydraulic control clutch mechanism controls the clutch between the friction disc 1 and the flywheel 3, and the slider electro-hydraulic control brake mechanism controls the braking of the slider 8. The control system realizes intelligent control of the friction disc electro-hydraulic control clutch mechanism and the slider electro-hydraulic control brake mechanism.

[0013] The friction disc electro-hydraulic controlled clutch mechanism includes a lever mechanism 4, the output end of the lever mechanism 4 is connected to the main shaft 2, the input end of the lever mechanism 4 is connected to the operating cylinder 10, the inlet and outlet oil of the operating cylinder 10 are connected through a three-position four-way hand-operated integrated electro-hydraulic proportional valve 11 and an oil outlet of an oil pump 14; the oil circuit supplied by the oil pump 14 reaches a corresponding pressure and enters the three-position four-way hand-operated integrated electro-hydraulic proportional valve 11, and the three-position four-way hand-operated integrated electro-hydraulic proportional valve 11 is operated to control the inlet and outlet oil of the operating cylinder 10, thereby completing the clutch operation of the two friction surfaces in the friction disc 1 and the flywheel 3.

[0014] The slide block electro-hydraulic control brake mechanism includes a first brake cylinder 17, a second brake cylinder 18, a third brake cylinder 25, and a fourth brake cylinder 26, which are evenly distributed on the outer side of the middle part of the slide block 8. The inlet and outlet oil of the four brake cylinders are connected through a two-position three-way electro-hydraulic proportional valve 16 and the oil outlet of the oil pump 14; the oil circuit supplied by the oil pump 14 reaches the corresponding pressure and enters the two-position three-way electro-hydraulic proportional valve 16, and the oil output of the two-position three-way electro-hydraulic proportional valve 16 is electrically controlled to push the brake blocks on the protruding ends of the first brake cylinder 17, the second brake cylinder 18, the third brake cylinder 25, and the fourth brake cylinder 26 to support the slide block 8 to complete the braking, and the two-position three-way electro-hydraulic proportional valve 16 is returned by power failure, and the first brake cylinder 17, the second brake cylinder 18, the third brake cylinder 25, and the fourth brake cylinder 26 return under the action of their respective springs.

[0015] The control system includes a position sensor 19 and a speed sensor 20 set for the slider 8, and the data outputs of the position sensor 19 and the speed sensor 20 are connected to the control ends of the two-position three-way electro-hydraulic proportional valve 16 and the three-position four-way hand-held electric electro-hydraulic proportional valve 11; the position sensor 19 and the speed sensor 20 detect the movement status of the slider 8 online, combine the iterative learning principle and the BP neural network control strategy, perform machine learning, and obtain processing parameters. By controlling the three-position four-way hand-held electric electro-hydraulic proportional valve 11 and the two-position three-way electro-hydraulic proportional valve 16, the reversing and braking of the slider 8 are completed, so that the slider speed and the flywheel speed reach the determined values, that is, the striking kinetic energy set before each forging is accurately controlled to achieve intelligent control.

[0016] That is to say, the present invention is aimed at the double-disc friction screw press widely used in existing industrial practice, and specifically involves adding an electro-hydraulic proportional valve to the hydraulic system for controlling the left and right movement of two friction disks on the top of the screw press, adding four hydraulic cylinders with braking functions to the slider, a slider displacement and speed sensor, and a corresponding electro-hydraulic system hardware and software intelligent control strategy, thereby realizing energy-saving, efficient, intelligent and automatic control of the double-disc friction screw press.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) The present invention transforms the control of the left and right movement of the top friction disk on the original double-disc friction screw press structure by adding a hand-electric integrated electro-hydraulic proportional valve to replace the manual operating lever, and a slider displacement and speed sensor to test the signal of the slider of the screw press, so as to obtain the required flywheel and slider striking kinetic energy online, and feed back the speed sensor on the slider to the electro-hydraulic proportional valve in a closed loop, so as to intelligently realize the left and right disks to quickly and accurately move the double friction disks on the top of the screw press to the left and right, and realize the forward and reverse rotation of the screw press flywheel and the upward and downward movement of the slider.

[0019] 2) Add four brake cylinders with braking functions to the slider, automatically detect the dynamic displacement and speed signals of the slider during its up and down movement, and adopt corresponding control strategies to achieve reliable and efficient braking and stopping of the slider at any position.

[0020] 3) The control system adopts the iterative learning principle and BP neural network intelligent control strategy. According to the deformation force and deformation work required for different plastic deformation workpieces, the required kinetic energy is determined. By automatically detecting the dynamic displacement and speed sensor detection signals during the up and down movement of the slider online, the flywheel speed and slider speed are accurately controlled in an adaptive closed loop to achieve energy saving and vibration reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the transmission structure of an embodiment of the present invention.

[0022] Figure 2 for Figure 1 AA cross-section diagram.

[0023] Figure 3 for Figure 1 BB cross-sectional view. DETAILED DESCRIPTION

[0024] The present invention is described in detail below in conjunction with embodiments and drawings.

[0025] like Figure 1 and Figure 2 As shown, the double-disc friction screw press includes a motor 21, which drives the belt 24 to rotate, and drives the main shaft 2 to drive the friction disk 1 to rotate. When the surface of the friction disk 1 contacts the flywheel 3, it drives the flywheel 3 to rotate, thereby rotating the screw rod 5, driving the slider 8 to move upward and downward, and completing the forging operation; by adjusting the position of the brake ramp 22, the lever 21 is pushed to tighten the brake belt 6 to complete the braking of the screw rod 5, and the upper and lower baffles 7 are used to limit the upper and lower positions of the driving slider 8.

[0026] An intelligent control system for a double-disc friction screw press comprises a friction disc electro-hydraulic control clutch mechanism, a slider electro-hydraulic control brake mechanism and a control system. The friction disc electro-hydraulic control clutch mechanism controls the clutch between the friction disc 1 and the flywheel 3, and the slider electro-hydraulic control brake mechanism controls the braking of the slider 8. The control system realizes intelligent control of the friction disc electro-hydraulic control clutch mechanism and the slider electro-hydraulic control brake mechanism.

[0027] like Figure 1 As shown, the friction disc electro-hydraulic controlled clutch mechanism includes a lever mechanism 4, the output end of the lever mechanism 4 is connected to the main shaft 2, the input end of the lever mechanism 4 is connected to the operating cylinder 10, the inlet and outlet oil of the operating cylinder 10 is connected through a three-position four-way hand-operated integrated electro-hydraulic proportional valve 11, a first pressure reducing valve 12 and an oil pump 14 outlet, and the oil pump 14 is connected to a relief valve 15; the oil circuit supplied by the oil pump 14 reaches a suitable pressure through the first pressure reducing valve 12 and enters the three-position four-way hand-operated integrated electro-hydraulic proportional valve 11, and the three-position four-way hand-operated integrated electro-hydraulic proportional valve 11 is manually operated or electrically controlled by the handle 9 to control the inlet and outlet oil of the operating cylinder 10, change the flow direction of the hydraulic oil in the operating cylinder 10, so that it pushes or pulls into the lever mechanism 4, thereby driving the main shaft 2 to move left and right, and completing the clutch operation of the two friction surfaces in the friction disc 1 and the flywheel 3.

[0028] like Figure 1 and Figure 3 As shown, the slide electro-hydraulic control brake mechanism includes a first brake cylinder 17, a second brake cylinder 18, a third brake cylinder 25, and a fourth brake cylinder 26 uniformly distributed on the outer side of the middle of the slide 8. The inlet and outlet oils of the first brake cylinder 17, the second brake cylinder 18, the third brake cylinder 25, and the fourth brake cylinder 26 are connected through a two-position three-way electro-hydraulic proportional valve 16, a second pressure reducing valve 13, and an oil pump 14 outlet; the oil supplied by the oil pump 14 reaches a suitable pressure through the second pressure reducing valve 13. The hydraulic oil enters the two-position three-way electro-hydraulic proportional valve 16, and the oil is discharged by the electronically controlled two-position three-way electro-hydraulic proportional valve 16 to push the brake blocks on the extended ends of the first brake cylinder 17, the second brake cylinder 18, the third brake cylinder 25, and the fourth brake cylinder 26 to press against the slider 8 to complete the braking. The two-position three-way electro-hydraulic proportional valve 16 is returned by power failure, and the first brake cylinder 17, the second brake cylinder 18, the third brake cylinder 25, and the fourth brake cylinder 26 are returned under the action of the spring, and the hydraulic oil flows back to the oil tank.

[0029] like Figure 1As shown, the control system includes a position sensor 19 and a speed sensor 20 set for the slider 8, and the data outputs of the position sensor 19 and the speed sensor 20 are connected to the control ends of the two-position three-way electro-hydraulic proportional valve 16 and the three-position four-way hand-operated integrated electro-hydraulic proportional valve 11; the position sensor 19 and the speed sensor 20 detect the movement status of the slider 8 online, record the data, refer to the screw press striking energy calculation formula (1), combine the iterative learning principle and the BP neural network control strategy, and perform machine learning to obtain the appropriate processing parameters for this batch of parts, and control the three-position four-way hand-operated integrated electro-hydraulic proportional valve 11 and the two-position three-way electro-hydraulic proportional valve 16 to complete the reversal and braking of the slider, so that the slider speed and the flywheel speed reach the determined value, that is, the striking kinetic energy set before each forging is accurately controlled to achieve intelligent control;

[0030]

[0031] Where m is the mass of the flywheel 3, the screw rod 5 and the slider 8 (kg), and J is the moment of inertia of the flywheel 3 and the screw rod 5 (kg·m 2 ), v is the maximum linear velocity of the slider 8 during striking (m / s), ω is the maximum angular velocity of the flywheel during striking (rad / s), and h is the thread lead of the screw rod (m).

Claims

1. An intelligent control system for a double-disc friction screw press, characterized in that: The invention comprises a friction disc electro-hydraulic controlled clutch mechanism, a slider electro-hydraulic controlled brake mechanism and a control system. The friction disc electro-hydraulic controlled clutch mechanism controls the clutch of the friction disc (1) and the flywheel (3), the slider electro-hydraulic controlled brake mechanism controls the braking of the slider (8), and the control system realizes intelligent control of the friction disc electro-hydraulic controlled clutch mechanism and the slider electro-hydraulic controlled brake mechanism.

2. The system according to claim 1, characterized in that: The friction disc electro-hydraulic controlled clutch mechanism comprises a lever mechanism (4), wherein the output end of the lever mechanism (4) is connected to the main shaft (2), and the input end of the lever mechanism (4) is connected to the operating oil cylinder (10). The inlet and outlet oil of the operating oil cylinder (10) are connected via a three-position four-way hand-operated integrated electro-hydraulic proportional valve (11) and an oil outlet of an oil pump (14); the oil supplied by the oil pump (14) reaches a corresponding pressure and enters the three-position four-way hand-operated integrated electro-hydraulic proportional valve (11), and the three-position four-way hand-operated integrated electro-hydraulic proportional valve (11) is operated to control the inlet and outlet oil of the operating oil cylinder (10), thereby completing the clutch operation between the two friction surfaces in the friction disc (1) and the flywheel (3).

3. The system according to claim 1, characterized in that: The slide block electro-hydraulic control brake mechanism comprises a first brake oil cylinder (17), a second brake oil cylinder (18), a third brake oil cylinder (25), and a fourth brake oil cylinder (26) uniformly distributed on the outer side of the slide block (8); the inlet and outlet oil of the first brake oil cylinder (17), the second brake oil cylinder (18), the third brake oil cylinder (25), and the fourth brake oil cylinder (26) are connected via a two-position three-way electro-hydraulic proportional valve (16) and an oil outlet of an oil pump (14); the oil supplied by the oil pump (14) reaches a corresponding pressure and enters the two-position three-way electro-hydraulic proportional valve (16) and the oil outlet of the oil pump (14); The proportional valve (16) operates the two-position three-way electro-hydraulic proportional valve (16) to discharge oil through electric control to push the brake blocks on the extended ends of the first brake oil cylinder (17), the second brake oil cylinder (18), the third brake oil cylinder (25) and the fourth brake oil cylinder (26) to press against the slide block (8) to complete braking. The two-position three-way electro-hydraulic proportional valve (16) is returned to its original position by power failure, and the first brake oil cylinder (17), the second brake oil cylinder (18), the third brake oil cylinder (25) and the fourth brake oil cylinder (26) are returned to their original position under the action of the spring.

4. The system according to claim 1, characterized in that: The control system comprises a position sensor (19) and a speed sensor (20) arranged for the slider (8); the data outputs of the position sensor (19) and the speed sensor (20) are connected to the control ends of the two-position three-way electro-hydraulic proportional valve (16) and the three-position four-way hand-operated integrated electro-hydraulic proportional valve (11); the position sensor (19) and the speed sensor (20) detect the movement status of the slider (8) online, combine the iterative learning principle and the BP neural network control strategy, perform machine learning, obtain processing parameters, and control the three-position four-way hand-operated integrated electro-hydraulic proportional valve (11) and the two-position three-way electro-hydraulic proportional valve (16) to complete the reversal and braking of the slider (8), so that the slider speed and the flywheel speed reach a certain value, that is, the striking kinetic energy set before each forging is accurately controlled, and intelligent control is realized.

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