Main dead point safety detection and locking system for a press automatic line and its locking method

Abstract

The present invention relates to a main dead center safety detection and locking system and a locking method for a host of a press automatic line. The locking system includes a flywheel, a crankshaft and a slider driven by a motor. A clutch-brake is connected to the end of the flywheel and the braking and clutching actions are realized by the drive of a cylinder. The cylinder is connected to a pressure air source through a double check valve. A braking cylinder is provided on the outer periphery of the flywheel for braking the flywheel during emergency stop. The braking cylinder is connected to the pressure air source through a normally closed two-way three-way solenoid valve. An electronic cam encoder is provided at one end of the crankshaft. A mechanical cam and a proximity switch one are connected to the other end of the crankshaft. Proximity switches two and three are respectively provided on the double check valve. A normally open two-way three-way solenoid valve is provided on the connecting pipeline between the double check valve and the clutch-brake for cutting off the pipeline in case of double check valve failure. A slider top dead center locking and detecting device is provided between the slider and the press body for locking the slider at the top dead center position in case of double check valve failure or asynchronous mutual inspection between the crankshaft and the slider.

Description

Technical Field

[0001] The present invention relates to the field of intelligent high-end equipment technology, and in particular to a top dead point safety detection and locking system for a main machine of a press automatic line and a locking method thereof, which is used in a crankshaft slider top dead point safety detection and locking system when a local abnormality occurs in the clutch and brake system of a press in automated stamping production. Background Art

[0002] In recent years, automated press lines have become increasingly popular within the sheet metal processing industry, particularly within the home appliance and automotive sectors, due to their advantages such as minimal footprint, high efficiency, and consistent finished product quality. With the application of advanced processes and technologies, demands for automated lines are increasing. This in turn requires the machines that comprise the automated lines to have faster stroke times and shorter stop times. Safety and reliability are fundamental to automated lines. Therefore, ensuring that the machine accurately and reliably stops at top dead center after each stamping process is crucial.

[0003] The main machine of the automated stamping production line in the prior art is divided into a single working mode and a continuous working mode. In the single working mode, the main machine needs to stop once after each stamping stroke to facilitate demolding. Each shutdown requires the crankshaft to stop at the origin position, and the corresponding slider to stop at the top dead center position. In the connected working mode, when the brake is required to stop after a certain number of continuous working strokes, the slider is also required to stop at the top dead center position to ensure safety. Whether it is a single working mode or a continuous working mode, the safe shutdown is based on the clutch braking system and the crankshaft slider mutual inspection synchronization. During the automatic operation process, once there is a problem with the clutch braking circuit or the crankshaft slider mutual inspection is not synchronized, the slider cannot be safely docked at the top dead center, and there are certain safety hazards. Summary of the invention

[0004] In response to the safety hazard problem that exists when an abnormality occurs in the clutch braking circuit or the crankshaft slider mutual inspection link in the press brake clutch system in the prior art, the present invention provides a main machine top dead point safety detection locking system for a press automatic line, aiming to set up a safety detection structure in the clutch braking circuit and the slider self-inspection link to ensure that the slider is locked at the top dead point link in the event of a sudden abnormality, thereby ensuring the safety of the press system.

[0005] In order to achieve the purpose of the present invention, the present invention first provides a main machine top dead center safety detection locking system of a press automatic line, including a flywheel and a crankshaft driven by a motor, a slider is connected to the crankshaft, a clutch brake is connected to the end of the flywheel, and the clutch brake is driven by a cylinder to realize braking and clutching actions. The cylinder is connected to the pressure air source through a double valve, and a brake cylinder is provided on the periphery of the flywheel for braking the flywheel in an emergency stop. The brake cylinder is often closed and a two-position three-way solenoid valve is connected to the pressure air source. An electronic cam is provided at one end of the crankshaft. encoder, the other end of the crankshaft is connected to a mechanical cam and a proximity switch 1 for detecting the crankshaft origin and the top dead center position of the slider, and is characterized in that the double valve is respectively provided with a proximity switch 2 and a proximity switch 3 for detecting the valve action position, and a normally open two-position three-way solenoid valve is provided on the connecting pipeline between the double valve and the clutch brake, which is used to cut off the pipeline when the double valve fails, and a slider top dead center locking detection device is provided between the slider and the press body, which is used to lock the slider at the top dead center position when the double valve fails or the crankshaft sliders are out of sync with each other.

[0006] The main machine top dead point safety detection locking system of the press automatic line of the present invention is provided with a normally open two-position three-way solenoid valve in the clutch brake circuit. When the double valve does not move and operates normally during braking, resulting in the clutch not moving and separating normally, the normally open two-position three-way solenoid valve and the normally closed two-position three-way solenoid valve are energized and operated at the same time, while cutting off the pressure air source of the clutch brake cylinder, thereby separating the clutch and causing the flywheel to lose power. At the same time, the brake cylinders circumferential to the flywheel operate to brake the flywheel. In addition, a slider top dead point locking detection device is provided between the slider and the press body. When the brake circuit fails or the crankshaft sliders are out of sync with each other, the slider can be locked at the top dead point position in time to ensure the safe operation of the press.

[0007] To facilitate the upper dead point locking of the slider, the upper dead point locking detection device of the slider includes a guide sleeve fixing seat connected to the press body, the guide sleeve is fixed on the guide sleeve fixing seat, the slider is provided with a guide block fixing seat, the guide block fixing seat is provided with a guide block cooperating with the guide sleeve, the direction of the guide block and guide sleeve guiding cooperation is consistent with the direction of movement of the slider, the guide cooperation section of the guide block and guide sleeve is provided with a waist-shaped hole with the length direction consistent with the guiding direction, the waist-shaped hole passes through the guide block and guide sleeve axially, and a locking fixing seat is provided on the outer side of the guide sleeve corresponding to the waist-shaped hole, and a horizontal guide sleeve is fixed on the locking fixing seat on the horizontal side corresponding to the waist-shaped hole, the horizontal outer end of the horizontal guide sleeve is connected to a locking cylinder, and the piston rod end of the locking cylinder is connected to a guide pin, the guide pin is guided and cooperated with the horizontal guide sleeve, and the outer end of the guide pin away from the piston rod can be guided through the waist-shaped hole and extend out of the outside of the waist-shaped hole.

[0008] In order to facilitate monitoring of the action of the brake cylinder, a proximity switch 4 is provided on the brake component of the brake cylinder to detect whether the brake member has reached the braking position. When the brake member reaches the braking position, the proximity switch 4 is triggered to send a braking signal.

[0009] In order to facilitate the detection of whether the slider is successfully locked, proximity switches five and six for detecting the position of the guide pin are provided at positions corresponding to the openings on both sides of the waist-shaped hole on the locking fixed seat. When the guide pin passes through proximity switches five and six, trigger feedback signals are respectively issued.

[0010] In order to further achieve the purpose of safe locking of the slider at the top dead point, the present invention also provides a locking method using the above-mentioned top dead point safety detection and locking system, which is specifically:

[0011] The PLC controller receives the braking signal and controls the following braking process and detection process, wherein the braking process includes active braking process and passive braking process.

[0012] Active braking process: The PLC controller sends a braking signal, and the electronic cam encoder calculates the braking angle according to the crankshaft slider stroke, so that the slider finally stops at the top dead center. It also sends a braking signal to the double valve, which actuates. The proximity switch 2 or proximity switch 3 detects the actuation signal of the double valve and feeds it back to the PLC controller, and the flywheel is successfully braked. If neither proximity switch 2 nor proximity switch 3 detects the actuation signal of the double valve, the passive braking process begins.

[0013] Detection process: The electronic cam encoder and the mechanical cam mutually check whether the crankshaft origin position is consistent and send a signal to the PLC controller through the proximity switch 1 to detect whether the slider stops at the top dead center position; when the signal of the crankshaft origin detected by the electronic cam encoder is inconsistent with the mechanical cam position detected by the proximity switch 1, a fault error signal and a passive braking signal are issued, and the passive braking process is entered;

[0014] Passive braking process: includes flywheel braking process and slider top dead point locking process. After receiving fault feedback, the PLC controller sends out flywheel braking signal and slider top dead point locking signal to synchronously enter the flywheel braking process and slider top dead point locking process respectively; flywheel braking process: the motor is powered off and decelerates until it stops, and at the same time, the normally open two-position three-way solenoid valve and the normally closed two-position three-way solenoid valve are simultaneously actuated to brake the flywheel to a stop; slider top dead point locking process: the locking cylinder intake piston rod moves to push the guide pin to insert into the waist-shaped hole, and proximity switch five and proximity switch six detect the guide pin position and feedback the slider locking top dead point signal to the PLC controller.

[0015] Through the above locking method, when there is an abnormality in the clutch-brake circuit or the crank-slider mutual inspection link in the continuous working mode and single working mode of the press, timely and safe shutdown is achieved from two aspects: flywheel braking and slider locking, ensuring rapid braking of the flywheel and locking the slider at the top dead center position to prevent accidents such as injury to people or damage to the die. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the safety detection and locking system for the top dead center of the main machine of the automatic press line of the invention.

[0017] Figure 2 is a three-dimensional view of the structure of the locking detection device for the slider top dead center.

[0018] Figure 3 It is a structural diagram of the locking detection device for the block top dead center.

[0019] Figure 4 It is a control relationship diagram of the safety detection and locking system for the top dead center of the main machine of the automatic press line of the present invention.

[0020] Among them, 1 is the motor; 2 is the flywheel; 3 is the clutch-brake; 4 is the normally open two-position three-way solenoid valve; 5 is the double check valve; 6 is the proximity switch two; 7 is the proximity switch three; 8 is the two-position two-way three-way solenoid valve; 9 is the proximity switch four; 10 is the brake cylinder; 11 is the proximity switch one; 12 is the mechanical cam; 13 is the slider; 14 is the crankshaft; 15 is the electronic cam encoder; 16 is the guide sleeve; 17 is the guide sleeve fixing seat; 18 is the proximity switch five; 19 is the horizontal guide sleeve; 20 is the locking cylinder; 21 is the locking fixing seat 22 is the guide block; 23 is the guide block fixing seat; 24 is the proximity switch six; 25 is the guide pin. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Embodiment 1

[0022] As Figures 1 to 3 shown, the safety detection and locking system for the top dead center of the main machine of the automatic press line of this embodiment includes a flywheel 2 and a crankshaft 14 driven by a motor 1. Specifically, when connecting, the motor is drivingly connected to the flywheel 2 through a transmission system. In this embodiment, a belt drive connection form is adopted. A clutch-brake 3 is provided at the end of the flywheel 1. The braking component of the clutch-brake 3 realizes braking and clutch actions through the drive of a cylinder. The cylinder is connected to the pressure air source through a double check valve 5. A brake cylinder 10 is provided on the outer circumference of the flywheel 2 for synchronously braking the flywheel 2 during emergency stop. The brake cylinder 10 is connected to the pressure air source through a normally closed two-position three-way solenoid valve 8; to facilitate monitoring the action of the brake cylinder 10, a proximity switch four 9 for detecting whether the braking component reaches the braking position is provided on the braking component of the brake cylinder 10. When the braking component reaches the braking position, the proximity switch four 9 is triggered to send a braking signal, indicating that the brake cylinder operates normally.

[0023] To achieve the transmission connection between the flywheel 2 and the crankshaft 14, the central axis of the flywheel 2 is connected to the crankshaft 14 via a transmission component. In this embodiment, a gear transmission connection is adopted; a slider 13 that moves synchronously is connected to the crankshaft. The slider 13 is used to mount the moving die part of the processing die; an electronic cam encoder 15 is provided at one end of the crankshaft 14, and a mechanical cam 12 and a proximity switch 11 for detecting the origin of the crankshaft 11 and the top dead center position of the slider 13 are connected to the other end of the crankshaft 14. The installation of the crank part of the crankshaft 14 and the protruding part of the mechanism cam corresponds to each other. When the cam rotates to the top dead center, it contacts the proximity switch 11 (this is also the position where the crankshaft is at the origin), causing it to trigger a feedback signal; at the same time, during the rotation of the crankshaft, the electronic cam encoder tracks the origin of the crankshaft according to the number of strokes and the position of the crankshaft, and cross-checks with the trigger signal of the proximity switch 1. To track and detect whether the strokes of the crankshaft 14 and the slider 13, and the phases of the electronic cam encoder 15 and the mechanical cam 12 are consistent, so as to ensure the accuracy of the movement of the slider 13; proximity switches 6 and 7 for detecting the valve action position are respectively provided on the dual valve 5. When the dual valve acts, generally one of the proximity switch 6 or the proximity switch 7 will generate a trigger signal. A normally open two-position three-way solenoid valve 4 is provided on the connecting pipeline between the dual valve 5 and the clutch brake 3, which is used to cut off the pipeline when the dual valve 6 fails, so that the cylinder of the clutch brake 3 acts to brake the flywheel 2. At the same time, a slider top dead center locking detection device is provided between the slider 13 and the press body, which is used to lock the slider 13 at the top dead center position when the dual valve 6 fails or the crankshaft and slider cross-check is out of sync.

[0024] To facilitate the realization of the locking of the slider at the top dead center, the slider top dead center locking detection device of this embodiment is as Figure 2 and Figure 3As shown in the figure, it includes a guide sleeve fixing seat 17 fixedly connected to the press body through a number of bolts. A guide sleeve 16 is fixedly connected to the guide sleeve fixing seat 17. A guide block fixing seat 23 is provided on the slider. The guide block fixing seat 23 is also fixedly connected to the slider 13 through a number of bolts. A guide block 22 that cooperates with the guide sleeve 16 is provided on the guide block fixing seat 23. The direction of the guiding cooperation between the guide block 22 and the guide sleeve 16 is the same as the direction of movement of the slider 13, that is, vertical movement. A waist-shaped hole with a length direction consistent with the guiding direction is provided in the guiding cooperation section between the guide block 22 and the guide sleeve 16. The waist-shaped hole axially penetrates the guide block 22 and the guide sleeve 16. A locking fixing seat 21 is provided on the outer side of the guide sleeve 16 corresponding to the waist-shaped hole. A horizontal guide sleeve 19 is fixed on one side in the horizontal direction corresponding to the waist-shaped hole on the locking fixing seat 21. The horizontal outer end of the horizontal guide sleeve 19 is connected to a locking cylinder 20. The end of the piston rod of the locking cylinder 20 is connected to a guide pin 25. The guide pin 25 is in guiding cooperation with the horizontal guide sleeve 19, and the outer end of the guide pin 25 away from the piston rod can be guided through the waist-shaped hole and extend out of the outer side of the waist-shaped hole. To facilitate detecting whether the slider 13 is successfully locked at a position near the top dead center, proximity switches five 18 and proximity switches six 24 for detecting the position of the guide pin 25 are provided at positions on the locking fixing seat 21 corresponding to the orifices on both sides of the waist-shaped hole. When the guide pin 25 passes by the proximity switch five 18 and the proximity switch six 24, trigger feedback signals are respectively sent out, indicating that the slider has been successfully locked at the top dead center position.

[0025] The top dead center safety detection and locking system of the press automatic line in this embodiment sets a normally open two-way three-way solenoid valve 4 in the clutch brake circuit. When the double pilot valve 5 does not move during braking and the clutch does not separate normally, neither the proximity switch two 7 nor the proximity switch three 6 sends an action signal, indicating a double pilot valve 5 failure. The normally open two-way three-way solenoid valve 4 and the normally closed two-way three-way solenoid valve 8 are simultaneously energized and actuated. On one hand, the pressure air source of the clutch brake cylinder is cut off to separate the clutch, and the flywheel loses power. At the same time, the braking cylinder 10 in the circumferential direction of the flywheel 2 acts to brake the flywheel. On the other hand, a slider top dead center locking detection device is provided between the slider 13 and the press body to lock the slider 13 at the top dead center position in time when there is a fault in the brake circuit or the crankshaft-slider mutual inspection is out of sync, ensuring the safe operation of the press. The above-mentioned top dead center safety detection and locking system of the main machine in this embodiment can be used in both single working mode and continuous working mode of automatic line stamping production. During normal braking, the clutch is separated by the action of the double pilot valve. During the movement process, the action of the double pilot valve is detected by the signal feedback of the proximity switch two and the proximity switch three to determine whether the flywheel is braked normally. At the same time, the electronic cam encoder and the mechanical cam always mutually inspect whether the crankshaft, electronic cam, and mechanical cam are consistent during the operation process to confirm that the crankshaft-slider actions are consistent, and all connection structures are correct without looseness or deviation. When any one of the double pilot valve, mechanical cam, or electronic cam is abnormal, the normally open two-way three-way solenoid valve 4, the normally closed two-way three-way solenoid valve 8, the braking cylinder, and the slider top dead center locking detection device act simultaneously to brake the flywheel and the slider, and ensure that the slider is locked near the top dead center, thus protecting the safety of the die and the press system.

[0026] Embodiment 2

[0027] This embodiment is a locking method for the top dead center safety detection and locking system of the press automatic line based on Embodiment 1, which is used in single working mode or continuous working mode of automatic stamping production. The control relationship of each action detection component in the system is as Figure 4 shown, and the locking method is controlled by a PLC controller, specifically as follows:

[0028] The PLC controller receives a braking signal and controls the implementation of the following braking process and detection process. The braking process includes an active braking process and a passive braking process. The active braking process refers to the normal shutdown in automatic production to brake the flywheel, crankshaft, and slider and lock the slider at the dead center position, and the corresponding crankshaft stops at the origin position. The passive braking process refers to the braking process when there is a fault in the brake circuit controlled by the double pilot valve or the crankshaft-slider mutual inspection requires an emergency stop.

[0029] Active braking process: The PLC controller issues a braking signal. The electronic cam encoder 15 calculates the braking angle based on the crank-slider stroke, causing the slider 14 to finally stop at the top dead center, and sends a braking signal to the dual valve 5. The dual valve 4 operates. The proximity switch two 7 or the proximity switch three 6 detects the action signal of the dual valve 5 and feeds it back to the PLC controller, and the flywheel is successfully braked. When neither the proximity switch two 7 nor the proximity switch three 6 detects the action signal of the dual valve 5, it indicates that the dual valve has a fault, and the passive braking process is entered.

[0030] Detection process: The electronic cam encoder 15 and the mechanical cam 12 mutually check whether the origin positions of the crankshaft 14 are consistent and send signals to the PLC controller through the proximity switch one 11 to detect whether the slider 13 stops at the top dead center position. When the signal of the crankshaft 13 origin detected by the electronic cam encoder 15 is inconsistent with the position of the mechanical cam 12 detected by the proximity switch one 11, the PLC controller issues a fault error signal and a passive braking signal, and enters the passive braking process.

[0031] Passive braking process: It includes the flywheel braking process and the slider top dead center locking process that are carried out simultaneously. After receiving the fault feedback, the PLC controller issues a flywheel braking signal and a slider top dead center locking signal, and enters the flywheel braking process and the slider top dead center locking process synchronously respectively. Flywheel braking process: The motor 1 is powered off and decelerates until it stops. At the same time, the normally open two-way three-way solenoid valve 4 and the normally closed two-way three-way solenoid valve 8 operate simultaneously to brake the flywheel 2 until it stops. Slider top dead center locking process: The locking cylinder 22 intakes air, and the piston rod moves to push the guide pin 25 to be inserted into the kidney-shaped hole in a guiding manner. The proximity switch five 18 and the proximity switch six 24 successively detect the position of the guide pin 25 and feed back the signal that the slider is successfully locked at the top dead center to the PLC controller.

[0032] In the above locking method, in the continuous working mode and the single working mode of the press, when the clutch-brake circuit or the mutual inspection link of the crankshaft slider is abnormal, it ensures timely and safe shutdown from two aspects of flywheel braking and slider locking, ensures rapid braking of the flywheel, and the slider is locked at the top dead center position, preventing accidents such as injury to people or damage to the mold.

Claims

1. A locking method for the upper dead point safety detection and locking system of the main machine of a press automatic line. The upper dead point safety detection and locking system of the main machine of the press automatic line includes a flywheel and a crankshaft driven by a motor. A slider is connected to the crankshaft. A clutch-brake is connected to the end of the flywheel. The clutch-brake realizes braking and clutch actions through the drive of a cylinder. The cylinder is connected to a pressure air source through a double-check valve. A braking cylinder is provided on the outer circumference of the flywheel for braking the flywheel during emergency stops. The braking cylinder is connected to the pressure air source through a normally closed two-way three-way solenoid valve. An electronic cam encoder is provided at one end of the crankshaft. A mechanical cam and a proximity switch 1 for detecting the origin of the crankshaft and the upper dead point position of the slider are connected to the other end of the crankshaft. It is characterized in that, Proximity switch two and proximity switch three for detecting the valve action position are respectively provided on the double - linked valve. A normally - open two - position three - way solenoid valve is provided on the connecting pipeline between the double - linked valve and the clutch brake for cutting off the pipeline in case of double - linked valve failure. A slider top dead center locking detection device is provided between the slider and the press body for locking the slider at the top dead center position in case of double - linked valve failure or out - of - sync mutual inspection between the crankshaft and the slider; A proximity switch four for detecting whether the braking member reaches the braking position is provided on the braking member of the braking cylinder. When the braking member reaches the braking position, the proximity switch four is triggered to send a braking signal; Proximity switch five and proximity switch six for detecting the position of the guide pin are provided at positions corresponding to the orifices on both sides of the kidney - shaped hole on the locking fixing seat. When the guide pin passes by proximity switch five and proximity switch six, trigger feedback signals are respectively sent; It is characterized in that the locking method The PLC controller receives the braking signal and controls the implementation of the following braking process and detection process. The braking process includes an active braking process and a passive braking process, Active braking process: The PLC controller sends a braking signal. The electronic cam encoder calculates the braking angle according to the crank - slider stroke, so that the slider finally stops at the top dead center and sends a braking signal to the double - linked valve. The double - linked valve acts, and the action signal of the double - linked valve detected by proximity switch two or proximity switch three is fed back to the PLC controller, and the flywheel is successfully braked; When neither proximity switch two nor proximity switch three detects the action signal of the double - linked valve, the passive braking process is entered; Detection process: The electronic cam encoder and the mechanical cam mutually check whether the origin positions of the crankshaft are consistent and send signals to the PLC controller through proximity switch one to detect whether the slider stops at the top dead center position; When the signal of the crankshaft origin detected by the electronic cam encoder is inconsistent with the position of the mechanical cam detected by proximity switch one, a fault error signal and a passive braking signal are sent, and the passive braking process is entered; Passive braking process: It includes a flywheel braking process and a slider top dead center locking process. After receiving the fault feedback, the PLC controller sends a flywheel braking signal and a slider top dead center locking signal and simultaneously enters the flywheel braking process and the slider top dead center locking process; Flywheel braking process: The motor is powered off and decelerates until it stops. At the same time, the normally - open two - position three - way solenoid valve and the normally - closed two - position three - way solenoid valve act simultaneously to brake the flywheel until it stops; Slider top dead center locking process: The locking cylinder intakes air and the piston rod moves to push the guide pin to be guided and inserted into the kidney - shaped hole. Proximity switch five and proximity switch six detect the position of the guide pin and feed back the slider locking top dead center signal to the PLC controller.

2. The locking method of the upper dead center safety detection and locking system of the main machine of the press automatic line according to claim 1, wherein the slider upper dead center locking detection device comprises a guide sleeve fixing seat connected to the press body, a guide sleeve is fixed on the guide sleeve fixing seat, a guide block fixing seat is arranged on the slider, a guide block matched with the guide sleeve is arranged on the guide block fixing seat, the direction of the guiding fit between the guide block and the guide sleeve is consistent with the direction of the slider movement, a kidney-shaped hole with the length direction consistent with the guiding direction is arranged on the guiding fit section of the guide block and the guide sleeve, the kidney-shaped hole axially penetrates through the guide block and the guide sleeve, a locking fixing seat is arranged on the outer side of the guide sleeve corresponding to the kidney-shaped hole, a horizontal guide sleeve is fixed on one side in the horizontal direction corresponding to the kidney-shaped hole on the locking fixing seat, a locking cylinder is connected to the horizontal outer end of the horizontal guide sleeve, a guide pin is connected to the end of the piston rod of the locking cylinder, the guide pin is in guiding fit with the horizontal guide sleeve, and the outer end of the guide pin far away from the piston rod can be guided to penetrate through the kidney-shaped hole and extend out of the outer side of the kidney-shaped hole.

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