A self-locking protection mechanism for die stamping

Abstract

The present invention belongs to the field of die stamping technology, and specifically refers to a self-locking protection mechanism for die stamping, including a positioning cylinder, a die mounting plate, a stamping mechanism, a trigger unit and a clearance unit, wherein the upper end of the positioning cylinder is fixed, the die mounting plate is arranged at the protruding end of the positioning cylinder, the stamping mechanism is centrally symmetrically arranged at the two side ends of the die mounting plate, the trigger unit is symmetrically arranged at the middle of the two sides of the die mounting plate, and the clearance unit is arranged at the bottom of the trigger unit. The present invention can clear the tilted workpiece out of the working area in advance through the cooperation of the trigger unit and the clearance unit, thereby better protecting the die and preventing the die from being damaged by abnormal materials.

Description

Technical Field

[0001] The invention belongs to the technical field of die stamping, and in particular relates to a self-locking protection mechanism for die stamping. Background Art

[0002] Die stamping is a processing method that applies pressure to the material to separate or plastically deform the sheet material to obtain the desired parts. Stamping requires the cooperation of the upper and lower dies.

[0003] Traditional stamping operations require operators to stand throughout the entire process, and the operator completes the loading, positioning, and unloading of the workpiece. When there is a problem with the workpiece, the operator can directly intervene to remove the workpiece. With the application and development of intelligent manufacturing technology, the stamping of small products has gradually achieved automatic loading, automatic positioning, and automatic unloading. It has become a trend that manual labor is replaced by machines.

[0004] However, automated stamping operations still have certain defects at this stage. There are defects in the incoming workpiece, and there may be problems with misalignment and tilting during automatic positioning, which makes the workpiece partially higher. During stamping, the inclined area of ​​the product contacts the mold in advance, and the workpiece folds after being pressed, resulting in serious uneven thickness of the sheet, causing damage to the mold, and even more serious damage to the stamping equipment.

[0005] However, the mold opening cost and the production cost of stamping equipment are relatively high, and the above problems need to be improved. Summary of the invention

[0006] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a self-locking protection mechanism for mold stamping. Through the cooperation of the trigger unit and the clearance unit, the tilted workpiece can be cleared out of the working area in advance, thereby better protecting the mold and avoiding damage to the mold due to abnormal materials.

[0007] The technical solution adopted by the present invention is as follows: A self-locking protection mechanism for mold stamping proposed by the present invention includes a positioning cylinder, a mold mounting plate, a stamping mechanism, a trigger unit and a clearance unit. The upper end of the positioning cylinder is fixed, and the mold mounting plate is arranged at the protruding end of the positioning cylinder. The center of the stamping mechanism is symmetrically arranged at the two side ends of the mold mounting plate, and the trigger unit is symmetrically arranged at the middle of both sides of the mold mounting plate. The clearance unit is arranged at the bottom of the trigger unit. The mold mounting plate is used to fix the upper mold, and a lower mold is arranged below the upper mold. The two cooperate with the stamping mechanism to stamp out the product into the desired shape. The air inlet pipe of the positioning cylinder is provided with air circuit valves at the front and rear, and the two sets of air circuit valves are respectively connected with the clearance units on both sides, and the clearance units are used to determine whether there are abnormal parts under the upper mold. When abnormal parts are found, the trigger unit starts and closes the air circuit valve, so that the air inlet pipe of the positioning cylinder is no longer ventilated, so that it stops extending, so as to protect the upper mold. The side wall of the positioning cylinder is also provided with a position sensor. When the trigger unit is started, the position sensor is used to determine whether the current stop position of the positioning cylinder is the set position. If it is not the set position, the alarm connected to the position sensor will alarm.

[0008] Furthermore, the trigger unit includes a touch rod, an outer sleeve, a rotating piston, a spring 1 and a hook claw, the outer sleeve is arranged through the mold mounting plate, the rotating piston is arranged in the outer sleeve, the rotating piston can be spirally lifted and lowered in the outer sleeve, the middle part of the hook claw is hinged in the rotating piston, the touch rod passes through the rotating piston and is slidably arranged in the outer sleeve, the spring 1 is connected between the top inner wall of the outer sleeve and the top of the touch rod, the spring 1 always pulls the touch rod into the inner part of the outer sleeve, and the end of the hook claw close to the spring 1 is hinged on the touch rod; a reset hole is provided at the upper end of the side wall of the outer sleeve, and when an abnormality occurs, the reset hole is inflated to enable the parts in the trigger unit to overcome the resistance of the spring 1 and reset to the initial state. In the initial state, the trigger unit can be actively operated by pumping air from the reset hole, thereby driving the clearance unit to rotate. A sensing hole is provided in the middle of the side wall of the outer sleeve, and the sensing hole is connected to the air circuit valve. An air inlet hole is provided at the bottom of the side wall of the outer sleeve. In the initial state, the outer circumferential side wall of the rotating piston is sealed and fitted with the sensing hole, thereby separating the sensing hole from the air inlet hole. A positioning groove is provided around the bottom of the inner side wall of the outer sleeve, and the bottom of the hook claw can be embedded in the positioning groove. A spiral groove is provided in the middle of the inner side wall of the outer sleeve; the interior of the rotating piston is hollow, and a positioning column 2 is provided in the hollow cavity inside the rotating piston. The middle part of the hook claw is hinged on the positioning column 2, and the outer side wall of the rotating piston A guide boss is provided on the upper part, and the guide boss is embedded in the spiral groove; a lower column is provided at the middle and lower part of the touch rod, and the lower column is sealed with the inner hole of the outer sleeve; a transverse slot is provided at the middle and upper part of the touch rod, and the transverse slot can make the hook claw open and close normally, so that the hook claw can be normally embedded in the positioning groove without causing interference to the hook claw; a longitudinal slot is provided at the middle and upper part of the touch rod perpendicular to the direction of the transverse slot, and when the touch rod slides along the outer sleeve, the positioning column 2 is in the longitudinal slot, and the longitudinal slot can avoid interference with the positioning column 2, and a positioning column 1 is provided at the upper end of the longitudinal slot, and one end of the hook claw close to the spring 1 is hinged on the positioning column 1; when the touch rod is pushed upward, the touch rod is in the spring The piston is pressed downwards and the piston is moved out of the way when the cam is in the air, and the piston is then pushed back into the airtight container, where it is pressed downwards and the cam is released, causing the piston to move out of the airtight container.

[0009] Furthermore, in order to completely cover and detect whether there is an abnormality in any area below the upper mold, the clearance unit includes an installation bin, a touch plate, a floating plate, a slider, a spring 2 and a rope. The installation bin is arranged at the lower end of the trigger unit, and the touch plate is arranged on the installation bin. Preferably, the touch plate is an isosceles triangle, and the floating plates are arranged in pairs. The floating plates are slidably arranged on the side walls of the touch plates, and the slider is slidably arranged in the installation bin. The spring 2 is connected between the slider and the installation bin, and the spring 2 is a tension spring. The rope is connected between the slider and the floating plate. Fixed pulleys are provided inside the floating plate and the touch plate, and the rope is wound around the fixed pulley. In the absence of external force intervention, the spring 2 causes the floating plate to slide in a direction away from the installation bin through the action of the slider and the rope, and the structure driven by the rope connection. The design can make both the touch plate and the floating plate thin plates, reduce the thickness and weight of the clearance unit, and also reduce the load of the clearance unit on the trigger unit; when there is an abnormal workpiece under the upper mold, the abnormal positioning of the workpiece causes local elevation, and the high point of the workpiece touches the touch plate or the floating plate first, and the workpiece causes a certain thrust on the touch plate or the floating plate, and this thrust is transmitted to the trigger unit. After the trigger unit is subjected to the force, it rotates a certain angle and drives the clearance unit to rotate as a whole, and the rotation radius of the floating plate is larger than the rotation radius of the touch plate. The floating plates of the clearance units symmetrically arranged on both sides will contact the diagonal floating plates when rotating. When in contact, the floating plates are subjected to the thrust of the other party and slide along the side wall of the touch plate, and the spring is stretched until the floating plates of the clearance units on both sides are separated from each other, and the spring and the floating plate are reset.

[0010] Furthermore, the stamping mechanism includes a hydraulic cylinder, a transmission rod, a pulley group 1, a pulley group 2, a motor, a balancing valve and a floating turntable. The floating turntable is rotatably arranged on the mold mounting plate, the transmission rod is penetrated and arranged in the center of the floating turntable, the protruding end of the hydraulic cylinder is arranged on the transmission rod, the motor is penetrated and arranged on the lower wall of the mold mounting plate, the pulley group 1 is connected between the motor and the floating turntable, the balancing valve is arranged on the upper wall of the mold mounting plate, and the balancing valve can be opened or closed by rotating the valve stem of the balancing valve, and the pulley group 2 is connected to the motor and the valve stem of the balancing valve; balancing oil tanks are symmetrically arranged at both ends of the mold mounting plate, and oil unloading holes are arranged on the upper and lower walls of the balancing oil tank, and mounting holes are symmetrically arranged in the middle of the mold mounting plate, the floating turntable is rotatably arranged in the balancing oil tank, the outer sleeve is arranged in the mounting hole, and there is a gap between the floating turntable and the upper and lower walls of the balancing oil tank, and the gap is filled with hydraulic oil. The position of the floating turntable in the height direction of the balancing oil tank is determined by the upper and lower ends. The content of hydraulic oil is determined. When the hydraulic pressure in the upper gap is greater, the floating turntable is biased downward. When the hydraulic pressure in the lower gap is greater, the floating turntable is biased upward. The oil unloading hole at the upper end of the balancing oil tank is connected to the balancing valve through the upper oil pipe, and the oil unloading hole at the lower end of the balancing oil tank is connected to the balancing valve through the lower oil pipe. The hydraulic oil content at the upper and lower ends of the balancing oil tank is adjusted by the upper and lower oil pipes, thereby adjusting the height of the floating turntable so that it can engage with the transmission rod; the lower end array of the transmission rod is provided with a mosaic rib plate, and the mosaic rib plates of the array are symmetrically arranged on both sides of the transmission rod. The internal array of the floating turntable is provided with a lining rib plate, and the lining rib plates of the array are symmetrically arranged on the inner side wall of the floating turntable. A gap is left between the lining rib plates on both sides, and the gap between the lining rib plates on both sides is not less than the width of the mosaic rib plate. The gap between the upper and lower adjacent lining rib plates is adapted to the thickness of the mosaic rib plate. In order to enable the mosaic rib plate to be easily inserted between the lining rib plates, the ends of the lining rib plates are processed by chamfering.

[0011] The beneficial effects achieved by the present invention using the above structure are as follows:

[0012] 1. The trigger unit cooperates with the clearance unit to determine whether the workpiece under the upper die is an abnormal part, so as to better protect the upper die and stamping equipment;

[0013] 2. The clearance unit can completely cover the space under the upper mold, and conduct full coverage detection of all areas under the upper mold that may have abnormalities, without missing any areas, thus avoiding the possibility of damaging the upper mold and stamping equipment due to missed detection;

[0014] 3. The floating plate can slide along both sides of the touch plate. Through this structural design, the lower space of the upper mold can be fully covered for detection. When an abnormality is found, the floating plate will not be restricted by the rotation radius, so that it can automatically rotate with the trigger unit;

[0015] 4. The use of ropes inside the clearance unit to drive the floating plate to slide can reduce the thickness of the touch plate and the floating plate, thereby reducing the weight of the clearance unit as a whole, and ultimately reducing the load on the spring in the trigger unit, thereby improving the detection sensitivity of the trigger unit;

[0016] 5. After receiving the thrust from the clearance unit, the trigger unit can automatically rotate upward and open the sensing hole. The external gas acts on the gas circuit valve through the sensing hole, closing the gas circuit valve and stopping the positioning cylinder from moving, thus preventing the upper mold from moving further downward and avoiding damage to the upper mold.

[0017] 6. The driving rod and floating turntable of the stamping mechanism are rotationally connected. During the rotation and engagement of the driving rod and the floating turntable, due to the low accuracy of the positioning cylinder, the positioning error generated in the height direction may cause the two to be unable to engage smoothly. The floating turntable can float up and down in the mold mounting plate, so that the driving rod and the floating turntable can be smoothly engaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A structural schematic diagram of a self-locking protection mechanism for die stamping proposed by the present invention;

[0019] Figure 2 This is the state diagram before the clearance unit is triggered;

[0020] Figure 3 This is the state diagram after the headroom unit is triggered;

[0021] Figure 4 An exploded view of a self-locking protection mechanism for die stamping proposed by the present invention;

[0022] Figure 5 Cutaway view of the trigger unit Figure 1 ;

[0023] Figure 6 Cutaway view of the trigger unit Figure 2 ;

[0024] Figure 7 A partial cross-sectional view of an exploded view of a trigger unit;

[0025] Figure 8 It is a structural schematic diagram of a rotating piston;

[0026] Fig. 9 is a cross-sectional view of the outer sleeve;

[0027] Fig.10 It is a structural schematic diagram of a region of a positioning column on a touch rod;

[0028] Fig.11 It is a schematic diagram of the structure of the headroom unit;

[0029] Fig.12 a cross-sectional view of a headroom unit;

[0030] Fig.13 It is the position relationship diagram of the stamping mechanism and the die mounting plate;

[0031] Fig.14 It is a schematic diagram of the internal structure of the transmission rod and the floating turntable;

[0032] Fig.15 A fracture view of a cross-sectional view of the mold mounting plate;

[0033] Fig.16 A fracture view of the transmission rod

[0034] Fig.17 This is a cross-sectional view of the floating turntable.

[0035] Among them, 1. positioning cylinder, 2. mold mounting plate, 3. stamping mechanism, 4. trigger unit, 5. clearance unit, 6. touch rod, 7. outer sleeve, 8. rotating piston, 9. spring 1, 10. hook claw, 11. reset hole, 12. air inlet hole, 13. induction hole, 14. spiral groove, 15. positioning groove, 16. lower column, 17. transverse slot hole, 18. longitudinal slot hole, 19. positioning column 1, 20. installation bin, 21. touch plate, 22. floating plate, 23. Slider, 24. Spring 2, 25. Rope, 26. Hydraulic cylinder, 27. Transmission rod, 28. Pulley group 1, 29. Pulley group 2, 30. Motor, 31. Balance valve, 32. Floating turntable, 33. Lower oil pipe, 34. Upper oil pipe, 35. Mounting hole, 36. Balance oil tank, 37. Oil unloading hole, 38. Mosaic rib plate, 39. Lining rib plate, 40. Air circuit valve, 41. Position sensor, 42. Positioning column 2, 43. Guide boss.

[0036] Among them, Figure 1 , Figure 2 and Figure 4 In the figure, a represents the upper mold.

[0037] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be understood that terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0040] like Figure 1-Figure 4 As shown, a self-locking protection mechanism for mold stamping proposed by the present invention includes a positioning cylinder 1, a mold mounting plate 2, a stamping mechanism 3, a trigger unit 4 and a clearance unit 5. The upper end of the positioning cylinder 1 is fixed, the mold mounting plate 2 is arranged at the protruding end of the positioning cylinder 1, the stamping mechanism 3 is centrally symmetrically arranged at the two side ends of the mold mounting plate 2, the trigger unit 4 is symmetrically arranged at the middle of the two sides of the mold mounting plate 2, and the clearance unit 5 is arranged at the bottom of the trigger unit 4. The mold mounting plate 2 is used to fix the upper mold a, and a lower mold (not shown in the drawings) is arranged below the upper mold a. The two cooperate with the stamping mechanism 3 to stamp out the product into the required size; Air circuit valves 40 are distributed on the front and rear of the air intake pipe of the positioning cylinder 1. The two groups of air circuit valves 40 are respectively connected to the clearance units 5 on both sides. The clearance units 5 are used to determine whether there are abnormal parts under the upper mold a. When abnormal parts are found, the trigger unit 4 starts and closes the air circuit valve 40, so that the air intake pipe of the positioning cylinder 1 is no longer ventilated and stops extending to protect the upper mold a. A position sensor 41 is also provided on the side wall of the positioning cylinder 1. When the trigger unit 4 is started, the position sensor 41 is used to determine whether the current stop position of the positioning cylinder 1 is the set position. If it is not the set position, the alarm connected to the position sensor 41 will alarm.

[0041] like Figure 4-Figure 10As shown, the trigger unit 4 includes a feeler rod 6, an outer sleeve 7, a rotating piston 8, a spring 9 and a hook 10. The outer sleeve 7 is arranged through the mold mounting plate 2, the rotating piston 8 is arranged in the outer sleeve 7, the rotating piston 8 can be spirally lifted and lowered in the outer sleeve 7, the middle part of the hook 10 is hinged in the rotating piston 8, the feeler rod 6 passes through the rotating piston 8 and is slidably arranged in the outer sleeve 7, the spring 9 is connected between the inner wall of the top end of the outer sleeve 7 and the top end of the feeler rod 6, the spring 9 always pulls the feeler rod 6 into the outer sleeve 7, and the end of the hook 10 close to the spring 9 is hinged on the feeler rod 6 A reset hole 11 is provided at the upper end of the side wall of the outer sleeve 7. When an abnormality occurs, the reset hole 11 is inflated to enable the parts in the trigger unit 4 to overcome the resistance of the spring 9 and reset to the initial state. The trigger unit 4 can also be actively operated by pumping air from the reset hole 11, thereby driving the clearance unit 5 to rotate. A sensing hole 13 is provided in the middle of the side wall of the outer sleeve 7. The sensing hole 13 is connected to the air circuit valve 40. An air inlet hole 12 is provided at the bottom of the side wall of the outer sleeve 7. In the initial state, the outer circumferential side wall of the rotating piston 8 is sealed and fitted with the sensing hole 13, thereby connecting the sensing hole 13 to the air circuit valve 40. The air inlet hole 12 is separated, a positioning groove 15 is arranged around the bottom of the inner wall of the outer sleeve 7, the bottom of the hook 10 can be embedded in the positioning groove 15, and a spiral groove 14 is arranged in the middle of the inner wall of the outer sleeve 7; the rotating piston 8 is hollow inside, and a positioning column 42 is arranged in the hollow cavity inside the rotating piston 8, the middle part of the hook 10 is hinged on the positioning column 42, and a guide boss 43 is arranged on the outer wall of the rotating piston 8, and the guide boss 43 is embedded in the spiral groove 14; a lower column 16 is arranged in the middle and lower part of the touch rod 6, and the lower column 16 is sealed with the inner hole of the outer sleeve 7, and the touch rod A transverse slot 17 is provided in the middle and upper part of the feeler rod 6, and the transverse slot 17 can enable the hook claw 10 to open and close normally, so that the hook claw 10 can be normally embedded in the positioning groove 15 without causing interference to the hook claw 10. A longitudinal slot 18 is provided in the middle and upper part of the feeler rod 6 in a direction perpendicular to the transverse slot 17. When the feeler rod 6 slides along the outer sleeve 7, the positioning column 42 is in the longitudinal slot 18, and the longitudinal slot 18 can avoid interference with the positioning column 42. A positioning column 19 is provided at the upper end of the longitudinal slot 18, and one end of the hook claw 10 close to the spring 19 is hinged on the positioning column 19;When the feeler rod 6 is pushed upward, the feeler rod 6 shrinks into the outer sleeve 7 under the action of the tension of the spring 19 and the external thrust. After the feeler rod 6 shrinks, it will drive the hook 10 to move upward through the positioning column 19. Because the middle part of the hook 10 is hinged on the positioning column 2 42, the hook 10 will first be retracted from the open state, so that the bottom of the hook 10 is separated from the positioning groove 15. After the hook 10 is separated from the positioning groove 15, the hook 10 will follow the feeler rod 6 to move upward and drive the rotating piston 8 to move upward. When the rotating piston 8 moves upward, it will also rotate a certain angle under the action of the guide boss 43 and the spiral groove 14, and drive the feeler rod 6 to rotate a certain angle synchronously. After the rotating piston 8 spirally rises, the sensing hole 13 is separated from the outer circumferential wall of the rotating piston 8, and the gas in the air inlet hole 12 enters the sensing hole 13, and then flows into the gas circuit valve 40, so that the gas circuit valve 40 is closed. ;

[0042] like Figure 11-Figure 12 As shown, in order to completely cover and detect whether there is an abnormality in any area below the upper mold a, the clearance unit 5 includes an installation bin 20, a touch plate 21, a floating plate 22, a slider 23, a spring 24 and a rope 25. The installation bin 20 is arranged at the lower end of the trigger unit 4, and the touch plate 21 is arranged on the installation bin 20. Preferably, the touch plate 21 is an isosceles triangle, the floating plates 22 are arranged in pairs, the floating plates 22 are slidably arranged on the side walls of the touch plates 21, the slider 23 is slidably arranged in the installation bin 20, the spring 24 is connected between the slider 23 and the installation bin 20, the spring 24 is a tension spring, the rope 25 is connected between the slider 23 and the floating plate 22, and fixed pulleys (not marked in the drawings) are arranged inside the floating plate 22 and the touch plate 21. The rope 25 is wound around the fixed pulley. In the absence of external force intervention, the spring 24 passes through the slider 23 and The rope 25 causes the floating plate 22 to slide in a direction away from the installation bin 20. The structural design connected and driven by the rope 25 can make the touch plate 21 and the floating plate 22 both thin plates, thereby reducing the thickness and weight of the clearance unit 5 and the load of the clearance unit 5 on the trigger unit 4. When there is an abnormal workpiece below the upper mold a, the abnormal positioning of the workpiece causes a local rise, and the high point of the workpiece touches the touch plate 21 or the floating plate 22 first. The workpiece causes a certain thrust on the touch plate 21 or the floating plate 22, and the thrust is transmitted to the trigger unit 4. After receiving the force, the trigger unit 4 rotates a certain angle and drives the clearance unit 5 to rotate as a whole. The rotation radius of the floating plate 22 is greater than the rotation radius of the touch plate 21. The floating plates 22 of the clearance unit 5 symmetrically arranged on both sides will contact the diagonal floating plates 22 when rotating. Figure 3 As shown, when in contact, the floating plate 22 receives the thrust of the other party and slides along the side wall of the contact plate 21, and the spring is stretched until the floating plates 22 of the clearance units 5 on both sides are separated from each other, and the spring and the floating plate 22 are reset.

[0043] like Figure 13-Figure 17As shown, the stamping mechanism 3 includes a hydraulic cylinder 26, a transmission rod 27, a pulley group 1 28, a pulley group 29, a motor 30, a balance valve 31 and a floating turntable 32. The floating turntable 32 is rotatably arranged on the mold mounting plate 2. The transmission rod 27 is arranged through the center of the floating turntable 32. The protruding end of the hydraulic cylinder 26 is arranged on the transmission rod 27. The motor 30 is arranged through the lower wall of the mold mounting plate 2. The pulley group 1 28 is connected between the motor 30 and the floating turntable 32. The balance valve 31 is arranged on the upper wall of the mold mounting plate 2. The valve stem of the balance valve 31 can be opened or closed by rotating it. Close the balancing valve 31, and the pulley group 29 is connected to the motor 30 and the valve stem of the balancing valve 31; the two ends of the mold mounting plate 2 are symmetrically provided with balancing oil tanks 36, and the upper and lower walls of the balancing oil tanks 36 are provided with oil unloading holes 37. The middle part of the mold mounting plate 2 is symmetrically provided with mounting holes 35, and the floating turntable 32 is rotatably arranged in the balancing oil tank 36. The outer sleeve 7 is arranged in the mounting hole 35. There is a gap between the floating turntable 32 and the upper and lower walls of the balancing oil tank 36. The gap is filled with hydraulic oil. The position of the floating turntable 32 in the height direction of the balancing oil tank 36 is determined by the hydraulic oil at the upper and lower ends. When the hydraulic pressure in the upper gap is greater, the floating turntable 32 is biased downward, and when the hydraulic pressure in the lower gap is greater, the floating turntable 32 is biased upward; the unloading hole 37 at the upper end of the balancing oil tank 36 is connected to the balancing valve 31 through the upper oil pipe 34, and the unloading hole 37 at the lower end of the balancing oil tank 36 is connected to the balancing valve 31 through the lower oil pipe 33. The hydraulic oil content at the upper and lower ends of the balancing oil tank 36 is adjusted through the upper oil pipe 34 and the lower oil pipe 33, thereby adjusting the height of the floating turntable 32 so that it can be engaged with the transmission rod 27; the lower end array of the transmission rod 27 is provided with an embedded The interlocking ribs 38 of the array are symmetrically arranged on both sides of the transmission rod 27. The internal array of the floating turntable 32 is provided with lining ribs 39. The lining ribs 39 of the array are symmetrically arranged on the inner wall of the floating turntable 32. There is a gap between the lining ribs 39 on both sides. The gap between the lining ribs 39 on both sides is not less than the width of the interlocking ribs 38. The gap between the upper and lower adjacent lining ribs 39 is adapted to the thickness of the interlocking ribs 38. In order to make the interlocking ribs 38 easily inserted between the lining ribs 39, the ends of the lining ribs 39 are processed by chamfering. Fig.14 In order to better show the matching state of the embedded rib plate 38 and the lining rib plate 39, only a part of the embedded rib plate 38 is shown. In fact, the embedded rib plate 38 is distributed on the transmission rod 27 in multiple groups (such as Fig.16 As shown), the number of the engaging ribs 38 on the transmission rod 27 can cover the stroke distance of the positioning cylinder 1 moving up and down.

[0044] During specific operation, the position of the position sensor 41 on the positioning cylinder 1 is set according to the specifications of the product to be stamped. When the positioning cylinder 1 is in this position, it stops extending, and the bottom wall of the clearance unit 5 is just close to the workpiece, but has not yet contacted the workpiece. When the clearance unit 5 rotates, the clearance unit 5 will not cause scratches on the surface of the workpiece; at the same time, the motor 30 is started, and the motor 30 drives the floating turntable 32 to rotate through the pulley group 1 28, so that the embedded rib plate 38 is in the middle of the gap between the inner lining rib plates 39 on both sides, ensuring that the transmission rod 27 can move up and down relative to the floating turntable 32. At this time, the valve stem of the balance valve 31 is opened under the action of the pulley group 29, so that the upper oil pipe 34 and the lower oil pipe 33 are connected, so that the oil at the upper and lower ends of the balance oil tank 36 can flow.

[0045] After the adjustment is completed, the positioning cylinder 1 is started, the air inlet pipe of the positioning cylinder 1 is ventilated, and the mold mounting plate 2 is driven to move downward, and the trigger unit 4 and the clearance unit 5 fixed on the mold mounting plate 2 also move downward.

[0046] If the workpiece under the upper mold a is abnormally positioned at this time, and a local tilt is high, when the touch plate 21 and the floating plate 22 move to the highest point of the workpiece, the workpiece contacts the touch plate 21 or the floating plate 22, and the workpiece applies a thrust to the touch plate 21 or the floating plate 22. This thrust is transmitted to the touch rod 6 through the mounting chamber 20. After the touch rod 6 is pushed upward, it will drive the end of the hook claw 10 hinged with the positioning column 19 to move upward, and the hook claw 10 is restricted by the positioning column 2 42, and the hook claw 10 cannot move up immediately. The hook claw 10 will first be retracted from the open state, so that the lower end of the hook claw 10 is disengaged from the positioning groove 15, and then move upward as a whole. When the hook claw 10 moves upward, the hook claw 10 drives the rotating piston 8 to move upward synchronously through the positioning column 2 42. The rotating piston 8 rises along the spiral groove 14 under the action of the guide boss 43. When the rotating piston 8 rotates, it will drive the synchronous rotation of the touch rod 6, so that the clearance unit 5 is rotated from the bottom of the upper mold a to outside the working area as a whole.

[0047] When the rotating piston 8 rotates and rises, the sensing hole 13 and the rotating piston 8 are no longer sealed, the air inlet hole 12 is connected to the sensing hole 13, and the gas flows into the sensing hole 13 from the air inlet hole 12, and then enters the air circuit valve 40, so that the air circuit valve 40 is closed, so that the positioning cylinder 1 no longer extends, and the upper mold a is prevented from continuing to press down the workpiece and causing damage to the upper mold a; because the positioning cylinder 1 stops moving at this time, the position sensor 41 cannot sense the position of the positioning cylinder 1, and the alarm connected to the position sensor 41 will alarm and remind the staff to confirm and handle it.

[0048] When the clearance unit 5 rotates following the trigger unit 4, a thrust is generated between the diagonal floating plates 22 on both sides. After being subjected to the force, the floating plates 22 will shrink and slide inward along the side walls of the touch plate 21. At this time, the spring 24 is stretched by the rope 25. When the clearance units 5 on both sides rotate and disengage, the spring 24 shrinks back to the initial state and pulls the floating plates 22 back to the initial position through the rope 25.

[0049] When the above fault processing is completed, it is only necessary to introduce gas into the reset hole 11 so that the gas pushes the feeler rod 6 downward and drives the rotating piston 8 and the hook 10 downward until the rotating piston 8 moves to the lowest position and the lower end of the hook 10 is re-embedded in the positioning groove 15. At this time, the feeler rod 6 rotates in the opposite direction to the initial angle and drives the clearance unit 5 to return to the bottom of the upper mold a.

[0050] If the workpieces under the upper mold a are in normal state during the descent of the positioning cylinder 1, the clearance unit 5 will not rotate midway. When the positioning cylinder 1 moves to the position sensor 41, the positioning cylinder 1 stops extending. The clearance unit 5 is close to the workpiece at this time, but is in contact with the workpiece. Air is sucked from the reset hole 11, causing the feeler rod 6 to contract under the action of negative pressure, and the feeler rod 6 moves up, thereby driving the rotating piston 8, the hook claw 10 and the clearance unit 5 to move up and rotate a certain angle. The working principle here is the same as the principle in the above-mentioned abnormal state, and will not be repeated.

[0051] When the clearance unit 5 rotates out of the working area, the motor 30 is started, and the motor 30 drives the floating turntable 32 to rotate through the pulley group 28, so that the embedded rib plate 38 rotates along the gap between the upper and lower adjacent lining rib plates 39 until it is embedded; if there is a height difference between the embedded rib plate 38 and the gap between the upper and lower adjacent lining rib plates 39, the embedded rib plate 38 will simultaneously apply a thrust to the lining rib plate 39 when it rotates, so that the lining rib plate 39 moves slightly up and down, so that the embedded rib plate 38 is stuck between the lining rib plates 39; when the lining rib plates 39 move up and down, the floating turntable 32 moves up and down synchronously, and with the movement of the floating turntable 32, the oil at the upper and lower ends of the balancing oil tank 36 will be automatically adjusted through the upper oil pipe 34, the lower oil pipe 33 and the balancing valve 31.

[0052] After the transmission rod 27 is engaged with the floating turntable 32, the motor 30 stops rotating, and the valve stem of the balance valve 31 rotates from an open state to a closed state under the action of the pulley group 29. At this time, the hydraulic oil at the upper and lower ends of the balance oil tank 36 will no longer flow, and the floating turntable 32 can no longer move up and down under the action of the oil. The mold mounting plate 2 is connected and fixed to the transmission rod 27 and the hydraulic cylinder 26, and no relative displacement occurs between the upper mold a and the transmission rod 27.

[0053] Then the hydraulic cylinder 26 is started, the hydraulic cylinder 26 is extended and retracted, and the upper mold a is driven downward through the transmission rod 27, the floating turntable 32 and the mold mounting plate 2. With the cooperation of the upper mold a and the lower mold, the stamping operation is completed.

[0054] This solution can detect abnormal parts in the entire operating area, solving the problem of single-point detection by sensors. It not only frees up manpower but also prevents damage to the mold.

[0055] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0056] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

[0057] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A self-locking protection mechanism for die stamping, characterized in that: The invention comprises a positioning cylinder (1), a mold mounting plate (2), a punching mechanism (3), a trigger unit (4) and a clearance unit (5), wherein the mold mounting plate (2) is arranged at the protruding end of the positioning cylinder (1), the punching mechanism (3) is centrally symmetrically arranged at the two side ends of the mold mounting plate (2), the trigger unit (4) is symmetrically arranged at the middle of the two sides of the mold mounting plate (2), and the clearance unit (5) is arranged at the bottom of the trigger unit (4); The clearance unit (5) comprises a mounting bin (20), a touch plate (21), a floating plate (22), a slider (23), a second spring (24) and a rope (25); the mounting bin (20) is arranged at the lower end of the trigger unit (4); the touch plate (21) is arranged on the mounting bin (20); the floating plates (22) are arranged in pairs; the floating plates (22) are slidably arranged on the side wall of the touch plate (21); the slider (23) is slidably arranged in the mounting bin (20); the second spring (24) is connected between the slider (23) and the mounting bin (20); and the rope (25) is connected between the slider (23) and the floating plate (22); The punching mechanism (3) comprises a hydraulic cylinder (26), a transmission rod (27), a pulley group 1 (28), a pulley group 2 (29), a motor (30), a balancing valve (31) and a floating turntable (32); the floating turntable (32) is rotatably arranged on the mold mounting plate (2); the transmission rod (27) is arranged through the center of the floating turntable (32); the protruding end of the hydraulic cylinder (26) is arranged on the transmission rod (27); the motor (30) is arranged through the lower wall of the mold mounting plate (2); the pulley group 1 (28) is connected between the motor (30) and the floating turntable (32); the balancing valve (31) is arranged on the upper wall of the mold mounting plate (2); and the pulley group 2 (29) is connected to the motor (30) and the valve stem of the balancing valve (31); The trigger unit (4) comprises a touch rod (6), an outer sleeve (7), a rotating piston (8), a spring (9) and a hook (10); the outer sleeve (7) is arranged through the mold mounting plate (2); the rotating piston (8) is arranged in the outer sleeve (7); the middle part of the hook (10) is hinged in the rotating piston (8); the touch rod (6) passes through the rotating piston (8) and is slidably arranged in the outer sleeve (7); the spring (9) is connected between the inner wall of the top end of the outer sleeve (7) and the top end of the touch rod (6); and the hook (10) is hinged on the touch rod (6) at one end close to the spring (9); Balancing oil bins (36) are symmetrically provided at both ends of the mold mounting plate (2), and oil discharge holes (37) are provided on the upper and lower walls of the balancing oil bin (36). The oil discharge hole (37) at the upper end of the balancing oil bin (36) is communicated with the balancing valve (31) through an upper oil pipe (34), and the oil discharge hole (37) at the lower end of the balancing oil bin (36) is communicated with the balancing valve (31) through a lower oil pipe (33). Mounting holes (35) are symmetrically provided in the middle of the mold mounting plate (2), and the outer sleeve (7) is arranged in the mounting hole (35); The floating turntable (32) is rotatably disposed in the balancing oil tank (36), and gaps are left between the floating turntable (32) and the upper and lower walls of the balancing oil tank (36); The lower end array of the transmission rod (27) is provided with an embedded rib plate (38), and the embedded rib plates (38) of the array are symmetrically arranged on both sides of the transmission rod (27). The internal array of the floating turntable (32) is provided with an inner lining rib plate (39), and the inner lining rib plates (39) of the array are symmetrically arranged on the inner side wall of the floating turntable (32). A gap is left between the inner lining rib plates (39) on both sides, and the gap between the inner lining rib plates (39) on both sides is not less than the width of the embedded rib plate (38), and the gap between the upper and lower adjacent inner lining rib plates (39) is adapted to the thickness of the embedded rib plate (38).

2. A self-locking protection mechanism for die stamping according to claim 1, characterized in that: A reset hole (11) is provided at the upper end of the side wall of the outer sleeve (7), a sensing hole (13) is provided in the middle of the side wall of the outer sleeve (7), an air inlet hole (12) is provided at the bottom of the side wall of the outer sleeve (7), a positioning groove (15) is provided around the bottom of the inner wall of the outer sleeve (7), the bottom of the hook claw (10) can be embedded in the positioning groove (15), and a spiral groove (14) is provided in the middle of the inner wall of the outer sleeve (7).

3. A self-locking protection mechanism for die stamping according to claim 2, characterized in that: The interior of the rotary piston (8) is hollow, a second positioning column (42) is provided in the hollow cavity inside the rotary piston (8), the middle part of the hook claw (10) is hingedly arranged on the second positioning column (42), and a guide boss (43) is provided on the outer wall of the rotary piston (8), and the guide boss (43) is embedded in the spiral groove (14).

4. A self-locking protection mechanism for die stamping according to claim 3, characterized in that: A lower column (16) is provided at the middle and lower part of the touch rod (6), and the lower column (16) is sealed with the inner hole of the outer sleeve (7). A transverse slot (17) is provided at the middle and upper part of the touch rod (6), and a longitudinal slot (18) is provided at the middle and upper part of the touch rod (6) in a direction perpendicular to the transverse slot (17). A positioning column (19) is provided at the upper end of the longitudinal slot (18), and one end of the hook (10) close to the spring (9) is hingedly provided on the positioning column (19).

5. A self-locking protection mechanism for die stamping according to claim 4, characterized in that: Air path valves (40) are distributed front and rear on the air inlet pipe of the positioning cylinder (1), and a position sensor (41) is provided on the side wall of the positioning cylinder (1).

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