A high-safety hardware mold stamping machine

Abstract

This invention relates to the field of stamping machine technology, specifically a high-safety hardware mold stamping machine, comprising: a frame, a motor housed within the frame, a main shaft mounted within the frame, a brake mounted on the main shaft, a transmission device connected to the main shaft, a foot switch mounted on the frame, a punch movably connected to the frame, and a worktable mounted on the frame; a sensing device is fixedly mounted on the worktable, controlling the descent of the punch; the sensing device includes a pressure plate and a safety light curtain; a push-away device is located above the pressure plate; when the safety light curtain stops the punch from falling, the push-away device is simultaneously activated to push the worker's hand off the pressure plate from the stamping machine. This invention improves the safety of the stamping machine by simultaneously pushing the worker's hand away or slowing the speed at which the hand reaches towards the stamping area when the safety device stops the stamping machine, ensuring that the worker's hands cannot enter the stamping area before the sensing device completely stops stamping.

Description

Technical Field

[0001] This invention relates to the field of stamping machine technology, specifically a high-safety hardware mold stamping machine. Background Technology

[0002] Metal stamping is a process that uses a punch press and dies to deform or break sheet metal such as stainless steel, iron, aluminum, and copper, as well as irregularly shaped materials, to achieve a specific shape and size. It has advantages such as low cost and speed, and can produce large quantities of identical metal parts. Metal stamping technology is widely used in the production of automotive parts and electrical components.

[0003] Currently, most domestic electronics and home appliance manufacturing industries are labor-intensive, and stamping machinery is widely used in their production processes. Due to the high cost and large footprint of fully automated production equipment, factories still rely on manual feeding and unloading of materials, inevitably placing workers near the dangerous areas of the stamping machinery. Stamping machinery is inherently dangerous, and to maximize operator safety, numerous safety devices are used. Currently, the most widely used safety devices in stamping production are two-hand push-button devices and photoelectric safety devices.

[0004] However, in production, due to changes in product requirements, the size of the molds needs to be constantly changed. Changing the size of the sheet metal is relatively cumbersome, often resulting in a mismatch between the sheet metal and the mold size. For example, when stamping small parts, because the sheet metal is much larger than the mold, it tends to tilt on the mold. This requires workers to manually support the sheet metal during continuous feeding to prevent tilting, ensuring it is in the correct position and maintaining stable stamping quality. The sheet metal also needs to be moved during continuous stamping for the next round. In this situation, using a two-button safety device means the worker cannot use their hands to support the sheet metal, thus affecting stamping production. Therefore, a two-button safety device is unsuitable for this production situation. When using a safety light curtain, because the worker is holding the sheet metal, their hands and the sheet metal are always near the mechanical danger zone. When manually supporting the sheet metal, the distance between the worker's hand and the danger zone of the stamping machine is insufficient to meet the safety distance required for the safety light curtain to send a signal to the stamping machine for response. The stamping machine cannot stop in time before causing injury to the worker, leaving the worker's hands unprotected during the stamping process.

[0005] Therefore, the use of these two types of stamping safety devices does not meet the production requirements of this production mode, and their applicability under this working condition is low, which in turn reduces the safety when producing small stamped parts.

[0006] Therefore, a high-safety hardware mold stamping machine is provided. Summary of the Invention

[0007] The purpose of this invention is to provide a high-safety hardware mold stamping machine, improve the applicability of safety devices in manual continuous feeding, and improve the safety of workers in manual continuous feeding.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A high-safety hardware mold stamping machine includes: a frame, a motor installed inside the frame, a main shaft installed inside the frame, a brake installed on the main shaft, a transmission device connected to the main shaft, a foot switch installed on the frame, a punch movably connected to the frame, an upper mold fixedly installed at the lower end of the punch, a worktable installed on the frame, and a lower mold fixedly installed on the worktable;

[0010] The features are as follows: a base is provided on the workbench, a fixed block is provided on the base, a limiting block is provided on the base, and a sensing device is fixedly installed on the limiting block. The sensing device controls the brake to stop the punch from falling. The sensing device includes a pressure plate and a safety light curtain. A push-away device is provided above the pressure plate. The pressure plate restricts the worker's arm within the push-away range of the push-away device and stores energy for the push-away device. After the safety light curtain detects that the hand is close to the danger zone, it brakes the punch and simultaneously activates the push-away device to push the hand off the pressure plate from the press.

[0011] It should be noted that the limit block boundary, from the limit block to the worker's side, is now defined as the safe zone; the mold closing range of the upper and lower molds is defined as the dangerous zone; and the area outside the safe zone and the dangerous zone is defined as the braking zone.

[0012] Based on the above scheme, its general working principle is as follows: Before stamping, the height of the limiting block is level with the mold through an adjustment device. The limiting block blocks the worker's hands, defining a safe area for the worker's activities. When the worker presses the pressure plate, the sensor detects that both hands or arms are placed on the pressure plate. The sensor then controls the brake to close, releasing the lock on the main shaft. The worker then presses the foot switch, causing the punch to move downwards and close the upper and lower molds. Furthermore, during the downward rotation of the pressure plate, the pressure plate drives the push-away device to retract. If at least one hand reaches into the danger zone of the stamping machine during the stamping process, the sensor controls the brake to open, locking the main shaft and stopping the punch movement, preventing the upper and lower molds from closing. Additionally, the sensor activates the push-away device, which pushes the worker's hand away from the stamping machine.

[0013] This design, through the cooperation of a pressure plate and a sensing device, forces the worker to keep both arms pressed against the pressure plate during material feeding; otherwise, the press stops operating. The press is started using a combination of hand and foot switches. This prevents accidental activation of the foot switch when the worker's hands are near the mold during material handling or other special circumstances, thus closing the mold and preventing accidents caused by the worker's hands not being removed in time. The sensing device, in conjunction with a push-away device, stores energy based on the worker's pressing action on the pressure plate. When the press stops, the sensor simultaneously pushes the worker's hands away or slows their movement towards the danger zone, ensuring that the worker's hands cannot enter the danger zone before the press completely stops, thereby improving the safety of the press.

[0014] Preferably, the sensing device includes two safety light grids vertically mounted on the limiting block, with the bottom of the safety light grids 15mm higher than the top of the limiting block. Two pressure plates are rotatably mounted on the limiting block, each pressure plate having an arc-shaped baffle. Side plates are provided on both sides of the pressure plates, and pull rods are provided on the four side plates. Each of the four pull rods is fitted with a spring. The pull rods are connected to the pressure plates via connecting ropes. When the spring only receives the weight of the pressure plates, the baffle is located between the two safety light grids. When the spring is in its natural state, the baffle is located between the two safety light grids. When the spring is fully compressed, the baffle is disengaged from the detection area between the two safety light grids.

[0015] Its working principle is as follows: When the worker feeds the material, he presses down on the pressure plate with both hands. The pressure plate rotates downward, causing the baffle to rotate. The baffle moves out of the detection range of the safety light curtain, and the press releases the brake. At the same time, the pressure plate moves the pull rod through the connecting rope, and the pull rod compresses the second spring. After the worker removes his hands from the pressure plate, the second spring returns to its original position under the action of its elasticity. The second spring pushes the pull rod, and the pull rod returns the pressure plate to its original position through the connecting rope. The baffle re-enters the inspection range of the safety light curtain, and the press is braked again.

[0016] It should be noted that, to ensure the sheet material does not obstruct the safety light curtain and stop the press, the safety light curtain is raised to create a designated area for the sheet material to pass through. The maximum thickness of the sheet material being pressed is generally 10mm, therefore this area must be at least 10mm high. To prevent the sheet material from obstructing the safety light curtain during pushing, a 50% margin is added, so the bottom of the safety light curtain is 15mm higher than the top of the limiting block. Multiple push ropes are used; if one rope fails, the others can still function normally, ensuring the normal operation of the device. This design better protects user safety and improves the reliability of the pushing device.

[0017] The combination of pressure plates and safety light curtains ensures that the press can only be started when the worker presses the pressure plate with their arm. This restrains the worker's hand or arm on the pressure plate during the stamping process, ensuring their hand is in a safe position. Furthermore, when a worker removes material, they might accidentally step on the foot switch, which could cause the press to close, potentially injuring their hand or body. This design ensures the press can only be started when the worker presses the pressure plate, and the safety light curtain also stops the press if the worker's hand reaches towards it while pressing the pressure plate, thus guaranteeing their hand is in a safe position during stamping. Once the worker's hand leaves the pressure plate, the baffle automatically resets and triggers the safety light curtain signal, stopping the press and preventing the aforementioned injury risks. Side plates on both sides of the pressure plate separate the two plates to prevent the worker from pressing both plates simultaneously with only one hand.

[0018] Preferably, the pushing device includes an electromagnet mounted on the pull rod, the electromagnet being electrically connected to a safety light curtain, a push block on each of the two side plates, an iron plate on each push block cooperating with the electromagnet, multiple push ropes connecting the two push blocks, a groove on each side plate for moving the push block along a defined trajectory, a spring between the push block and the groove, and the end of the groove facing the person tilting upwards.

[0019] Its working principle is as follows: When the pressure plate is first pressed, the baffle still blocks the safety light curtain, and the safety light curtain controls the electromagnet to be de-energized. The electromagnet cannot attract the iron piece on the push block, so the pull rod cannot move during the downward rotation of the pressure plate. When the baffle no longer blocks the safety light curtain, the safety light curtain controls the electromagnet to be energized. The electromagnet attracts the iron piece on the push block, and the pull rod and push block are attracted together. During the movement of the pull rod, the push block is moved, and the push block compresses the first spring. When the arm is still pressing the pressure plate but the hand triggers the safety light curtain, the safety light curtain controls the electromagnet to be de-energized. The electromagnet cannot attract the iron piece on the push block, and the push block separates from the pull rod. This allows the pressure plate pressed by the worker to no longer restrict the push block. At this time, the push block is only subjected to the elastic force of the first spring. The push block resets under the elastic force of the first spring, and the push rope connecting the two push blocks pushes the worker's hands upward away from the press.

[0020] It should be noted that, in order to conform to the direction of rotation of the human hand joint, the slide is tilted upwards, so that the worker's hand can bend towards himself better during the pushing process.

[0021] This design utilizes safety light curtains to detect when a worker's hands reach towards the stamping area. Simultaneously, it brakes the stamping machine and forcibly pushes the worker's hands away, ensuring worker safety. Furthermore, it reduces the speed at which the worker's hands reach towards the stamping machine, stopping it before the worker enters the dangerous area, thus improving the safety of using the stamping machine.

[0022] Preferably, the limiting block is provided with a telescopic rod. When the telescopic rod is in the extended state, it is located on the moving path of the baffle. An infrared sensor is provided on the side plate. The infrared sensor electrically controls the telescopic rod. A spring is provided on the top of the extended end of the telescopic rod. A sleeve is fixedly connected above the spring. The telescopic rod provides movement limit for the sleeve, and the side wall of the sleeve is always in contact with the fixed end of the telescopic rod.

[0023] Its working principle is as follows: During the feeding process, the worker first presses the pressure plate, and the baffle rotates out of the detection range of the safety light curtain. When feeding, the worker's hands continue to move forward. The worker's hands or arms block the infrared sensor, and the infrared sensor controls the extension rod to extend. The extension rod is in the reset path of the baffle. At this time, due to the obstruction of the extension rod, even if the worker cannot press the pressure plate into place, the baffle will not reset and trigger the safety light curtain. When the worker's hands are removed, the hands no longer block the infrared sensor, the extension rod retracts, and the baffle can reset. The baffle can still trigger the safety light curtain to stop the press when no one is pressing it.

[0024] It should be noted that spring three is used as a buffer for the telescopic rod to prevent the baffle from remaining on the telescopic rod when it extends, thus avoiding damage. The telescopic rod provides a movement limit for the sleeve, making its movement more stable. Furthermore, it allows the sleeve to apply the force of the baffle to the fixed end of the telescopic rod, which is thicker and has a base at the bottom, further enhancing stability. This reduces the impact on the telescopic rod's extension and retraction.

[0025] This design eliminates the need for workers to continuously press the pressure plate during the feeding process, preventing issues such as the pressure plate failing to be pressed down properly due to the arm gradually straightening during material feeding, thus triggering the safety light curtain and causing accidental stops. This ensures the continuity of the feeding operation.

[0026] Preferably, two fixing blocks are rotatably mounted on the base. The two fixing blocks are L-shaped and are provided with adsorption elements. The base is provided with protrusions that limit the rotation angle of the fixing blocks.

[0027] The adsorption element is a magnet, and the fixing block includes a first fastening magnet, a second fastening magnet, and a third fastening magnet. The first fastening magnet...

[0028] After changing the mold, the distance between the mold and the limiting block changes due to the size of the mold and the area on the worktable where the present invention can be placed. When the distance between the mold and the limiting block is less than the safety distance required for the safety light curtain, the safety light curtain cannot stop the press in time, causing a safety accident and thus ensuring the effectiveness of the safety light curtain.

[0029] Its working principle is as follows: When the worktable is large enough and has sufficient area to place the base, the base is fully placed on the worktable. Rotating the fixing block causes the first fastening magnet on the fixing block to restrict the vertical movement of the base. The feeding table presses against the mold to restrict the horizontal movement. The protrusion of the fixing block prevents the device from tipping over when the worker presses down. When the worktable is too small or the mold is too large and the worktable does not have enough area to place the base, rotating the fixing block causes the second and third fastening magnets to work together to press the fixing block tightly against the worktable. At this time, the second fastening magnet restricts the horizontal movement of the base, and the third fastening magnet restricts the vertical movement. The recess on the base is locked against the edge of the worktable to prevent the device from tipping over, thus fixing the device to the edge of the worktable.

[0030] This design solves the problem of unstable placement of safety devices due to insufficient space on the worktable when changing different molds, thus improving the device's adaptability to different molds. The fixing block prevents workers from applying force to the device during feeding, thus preventing it from pushing closer to the mold. Failure to meet the operating conditions of the safety light curtain can lead to its inability to stop the stamping machine in time, causing safety accidents, thereby ensuring the safety of stamping operations.

[0031] The device is magnetically attached, making it easy to move when changing molds and avoiding interference with the mold change process.

[0032] Preferably, the push block is equipped with a pulley, and the connecting rope is wound around the movable pulley. One end of the connecting rope is connected to the edge of the pressure plate, and the other end is fixed to the limiting block. The movable pulley structure reduces the resistance generated by the compression and pushing device, and increases the force with which the pushing device pushes the worker's hands away, ensuring the effectiveness of pushing the worker's hands away. Because of the movable pulley structure, the pressure plate needs to rotate twice its stroke to compress the pushing device. To ensure the pushing distance of the pushing device, the connecting rope is connected to the edge of the pressure plate, increasing the rotation radius and stroke, thereby maximizing the compression of the pushing device and increasing the distance the pushing device pushes the worker's hands away, thus improving the safety of the device.

[0033] Preferably, a feeding platform is fixedly provided on the side of the limiting block near the lower mold, and the other end of the feeding platform rests against the side of the lower mold so that the distance between the limiting block and the lower mold is equal to the safety distance required by the safety light curtain.

[0034] Because workers need to press the pressure plate when using this device, it is inconvenient for them to control the up-and-down movement of the sheet metal. This design allows workers to place the sheet metal on the feeding table and manually push it to feed the stamping machine. This ensures that the sheet metal is correctly positioned before entering the mold, preventing it from falling between the limiting block and the mold after being punched by the stamping machine, thus avoiding situations where workers have to reach into the dangerous area to manually retrieve or remove it. This improves worker efficiency and reduces worker hazards.

[0035] According to safety light curtain installation standards, the safety distance S must not be less than 100mm. When the distance between the limit block and the mold is less than 100mm, the safety light curtain cannot stop the press in time to prevent hands from being placed in the danger zone.

[0036] By placing the feeding platform between the limiting block and the mold, a sufficient safety distance is ensured between the safety light curtain and the stamping area, allowing the safety light curtain to stop the stamping machine in a timely manner. This prevents accidents caused by worker installation errors or forgetting to leave a safety distance, which could result in the limiting block being too close to the mold and the safety light curtain failing to stop the stamping machine in time. In addition, it balances the center of gravity shift caused by the sensing device, increasing the stability of the device in use.

[0037] Preferably, the maximum retraction of the push-away device is equal to the length of the travel of the end of the baffle used to block the safety light curtain.

[0038] This design ensures that the baffle can only completely disengage from the detection area of ​​the safety light curtain after the worker fully compresses the push-away device, thereby releasing the safety light curtain's braking effect on the press. This guarantees the push-away device is usable in every processing cycle, thus ensuring the protective effect of this invention. It also ensures that the push-away device provides sufficient pushing force and distance in each pressing process to start the press, guaranteeing that after triggering the safety light curtain, the push-away device has sufficient pushing force to quickly push the hand away from the press, thus ensuring the safety of using this invention. If the push-away device is not sufficiently compressed, even if the safety light curtain brakes the press, the push-away device will not provide sufficient pushing force and distance when a hand is extended into the pressing area, thus compromising the operator's safety.

[0039] Preferably, the support plate and the pressure plate are tilted downwards at 17° when in their natural state. To ensure that the pressure plate can correctly detect whether the worker's arm is pressing on it, a method of setting the tilt angle of the pressure plate is adopted so that the material placed on the pressure plate can slide down. When debris falls on the pressure plate, the debris slides down with the material and will not affect the detection function of the pressure plate. The minimum tilt angle that can make the material slide down is calculated. Most of the stamping material is stainless steel. The static friction coefficient between polyethylene plastic and stainless steel is about 0.2 to 0.3. Therefore, the minimum tilt angle θ that the pressure plate can make slide down is θ = arctan(0.3) ≈ 17°. So when the tilt angle of the pressure plate is 17°, the material that falls on the pressure plate can just slide down. If the angle is too large, it will make the worker's pressing action on the pressure plate awkward and increase the difficulty of pressing the pressure plate during the feeding process; if the angle is too small, it will not be able to balance the gravity and prevent the debris from sliding down. This design reduces the risk of the sensor misidentifying a worker's hand as a pressing plate due to debris or material pressing down on it, thus preventing the incorrect release of the press brake. It ensures that the push-away device can accurately push the worker's hand away after the safety light curtain is triggered, thereby improving the safety of the device.

[0040] It is worth noting that if the pressure plate or sheet is made of other materials, increasing the friction between the sheet and the pressure plate, the tilt angle needs to be appropriately increased to ensure the sheet on the pressure plate is secure and the height of the pressure plate is increased so that workers can press the pressure plate in a convenient posture.

[0041] In summary, compared with the prior art, the beneficial effects of the present invention are as follows:

[0042] 1. Improve the applicability of safety devices in manual continuous feeding and enhance the safety of workers during manual continuous feeding. By simultaneously pushing the worker's hand or arm away or slowing the speed at which the hand reaches into the stamping area when the press is stopped, the sensing device ensures that the worker's hands cannot enter the stamping area before the press is completely stopped.

[0043] 2. Ensure the pushing device has sufficient force to remove the worker's hand. To achieve this, a force-saving mechanism is used, utilizing the principle of pulleys to amplify the force exerted by the worker pressing the pressure plate, thus providing sufficient pushing force. This ensures the worker can promptly leave the danger zone during the process from the safety light curtain sending a signal to the press stopping, protecting the worker's safety.

[0044] 3. Ensure the push-away device can promptly and accurately push away the operator's hand as the safety light curtain stops the press. By introducing specific actions to start the press during continuous feeding, the worker's feeding movements are restricted, confining the worker's arm within a specific area. This ensures the push-away device can accurately push the hand away, thereby improving the press's safety. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the main structure of the stamping press;

[0046] Figure 2 for Figure 1 Enlarged view of section A;

[0047] Figure 3 This is the left view of the stamping machine;

[0048] Figure 4 for Figure 3 Enlarged view of section B;

[0049] Figure 5 for Figure 4 Enlarged view of section C;

[0050] Figure 6 for Figure 4 A cross-sectional view of the present invention;

[0051] Figure 7 for Figure 6 Enlarged view of section D;

[0052] Figure 8 for Figure 7 Diagram showing the state of the pressing plate;

[0053] Figure 9 for Figure 7 State diagram of the trigger push-off device.

[0054] In the diagram: 1. Frame; 2. Lower die; 3. Punch; 4. Foot switch; 5. Limiting block; 6. Sensing device; 7. Base; 8. Infrared sensor; 9. Fixing block; 10. Feeding table; 11. Push-away device; 101. Spindle; 102. Brake; 103. Worktable; 201. Upper die; 601. Safety light curtain; 602. Pressure plate; 603. Baffle; 604. Spring 2; 605. Pull rod; 801, telescopic rod; 802, spring three; 803, sleeve; 901, protrusion; 902, fastening magnet one; 903, fastening magnet two; 904, fastening magnet three; 1101, side plate; 1102, slide groove; 1103, push block; 1104, pusher rope; 1105, spring one; 1106, connecting rope; 1107, pulley; 1108, electromagnet; 1109, iron sheet. Detailed Implementation

[0055] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0056] Please see Figures 1 to 9 This illustrates a specific embodiment of the present invention:

[0057] The sheet material is stainless steel, and the sheet size is 200mm×300mm×5mm. The die stamping area is 200mm×100mm. The stamping press stroke is 200mm.

[0058] The following selections are made based on actual production conditions: The feeding platform 10 is set to a length of 100mm according to the required safety distance of the safety light curtain 601. The safety light curtain 601 is 200mm long and vertically installed. The height difference between the safety light curtain 601 and the limiting block 5 is 8mm, and the distance between the two safety light curtains 601 is 200mm. The pressure plate 602 is made of polyethylene plastic. Since the static friction coefficient between polyethylene plastic and stainless steel is approximately 0.3, the tilt angle of the pressure plate 602 is set to θ = arctan(0.3) ≈ 17° to allow debris and material pieces falling on the pressure plate 602 to slide off slowly. Based on the fact that the weight of a single hand and forearm of a 50kg adult woman is approximately 2kg, the spring 1105 has an elastic coefficient of 156N / m and a maximum deformation of 80mm. The minimum magnetic force of the electromagnet 1108 is at least 25N. The push rope 1104 is made of aramid material. The push rope 1104 has less deformation when pushing the hand away, resulting in a faster pushing speed and better effect.

[0059] During installation, a fastening magnet 902 is fastened to the fixing block 9. The fastening magnet 902 restricts the vertical movement of the base 7. The protrusion 901 jams the fixing block 9, preventing the device from tipping over when the worker presses it down.

[0060] Before using the press, place your hands outside the safe area, step on the foot switch 4, observe whether the press punch 3 falls, and test whether the safety light curtain 601 is malfunctioning.

[0061] The material sheet is placed on the feeding table 10, and both hands are naturally placed on the pressure plate 602. The pressure plate 602 rotates downwards under the weight of the hands and arms. The baffle 603 on the pressure plate 602 moves away from the detection area of ​​the safety light curtain 601, releasing the control of the brake 102, allowing the punch 3 to fall. During the downward rotation of the pressure plate 602, the pressure plate 602 pulls the push block 1103 within the slide groove 1102 via the connecting rope 1106. The push block 1103 compresses the spring 1105, retracting the push block 1103 towards the limiting block 5. The hands continue to move forward, and the worker's hands or arms block the infrared sensor 8. The infrared sensor 8 controls the extension rod 801 to extend, placing the extension rod 801 on the reset path of the baffle 603. Pushing the sheet material with both hands, part of the sheet material is placed into the lower mold 2 along the feeding table 10. Keeping both hands on the pressure plate 602, the worker steps on the foot switch 4. The foot switch 4 controls the punch 3 to fall, and the upper mold 201 fixed on the punch 3 closes with the lower mold 2. The stamping of the sheet material is completed. The worker lifts one hand, and the pressure plate 602, which was pressed by that hand, is no longer under the pressure of the hand. The pressure plate 602 resets under the elastic force of spring 1105 and spring 2604. The hand no longer blocks the infrared sensor 8, the telescopic rod 801 retracts, and the pressure plate 602 drives the baffle 603 to rotate into the detection area of ​​the safety light curtain 601. The safety light curtain 601 controls the brake 102 to brake the main shaft 101. At this time, during the reset of the pressure plate 602, the push block 1103 resets simultaneously. The push rope 1104 connecting the two push blocks 1103 pushes the worker's hands upward away from the stamping machine. Workers use their hands or tools to complete the stamping of workpieces, thus avoiding accidental stepping of the foot switch 4 in the material handling factory, which could cause the mold to suddenly close and injure the worker's hand.

[0062] During the stamping process, if a worker's arm presses against the pressure plate 602 or their hands block the infrared sensor 8, but their hand reaches towards the stamping machine and triggers the safety light curtain 601, the safety light curtain 601 controls the electromagnet 1108 to de-energize. The electromagnet 1108 no longer attracts the push block 1103, and the push block 1103 separates from the pull rod 605. The pressure plate 602 no longer restricts the push block 1103 from resetting, and the push block 1103 moves rapidly under the elastic force of the first spring 1105. The push rope 1104 connecting the two push blocks 1103 pushes the worker's hands upward away from the stamping machine, causing the worker's arms to bend towards themselves, thus ensuring worker safety. At this time, after the hands are lifted and the infrared sensor 8 no longer detects the hands, the telescopic rod 801 retracts, the baffle 603 resets again, continues to block the safety light curtain 601, the second spring 604 drives the pressure plate to reset, and the pull rod 605 contacts the push block 1103 again.

[0063] When the last piece of material is completely on the feeding table 10, the worker's hands cannot press the pressure plate 602 while simultaneously placing the piece into the lower mold 2 due to the obstruction of the limiting block 5. The worker places the piece into the mold, then puts his hands back on the pressure plate 602 and presses the foot switch 4. The foot switch 4 controls the punch 3 to fall, and the upper mold 201 fixed on the punch 3 closes with the lower mold 2.

[0064] Although the beneficial effects of the present invention have been shown in detail and embodiments have been provided in this specification, those skilled in the art can make various changes, modifications, substitutions and alterations to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-safety hardware mold stamping machine, comprising: A frame (1) is provided with a motor inside the frame (1), a spindle (101) is installed inside the frame (1), a brake (102) is provided on the spindle (101), a transmission device is connected to the spindle (101), a foot switch (4) is provided on the frame (1), a punch (3) is movably connected on the frame (1), an upper mold (201) is fixedly installed at the lower end of the punch (3), a worktable (103) is provided on the frame (1), and a lower mold (2) is fixedly installed on the worktable (103); The feature is that: a base (7) is provided on the workbench (103), a fixing block (9) is provided on the base (7), a limiting block (5) is provided on the base (7), and a sensing device (6) is fixedly installed on the limiting block (5). The sensing device (6) controls the brake (102) to stop the punch (3) from falling. The sensing device (6) includes a pressure plate (602) and a safety light curtain (601). A pushing device (11) is provided above the pressure plate (602). The pressure plate (602) restricts the worker's arm within the pushing range of the pushing device (11) and stores energy for the pushing device (11). The safety light curtain (601) brakes the punch (3) after detecting that the hand is close to the danger area, and at the same time starts the pushing device (11) to push the hand on the pressure plate (602) away from the press. The sensing device (6) includes two safety light grids (601) vertically mounted on the limiting block (5). The bottom of the safety light grid (601) is 15mm higher than the top of the limiting block (5). Two pressure plates (602) are rotatably mounted on the limiting block (5). Each of the two pressure plates (602) is provided with an arc-shaped baffle (603). Side plates (1101) are provided on both sides of the pressure plates (602). Pull rods (605) are provided on the four side plates (1101). Each of the four pull rods (605) is fitted with a second spring (604). The pull rods (605) are connected to the pressure plates (602) by a connecting rope (1106). When the second spring (604) is in its natural state, the baffle (603) is located between the two safety light grids (601). When the second spring (604) is fully compressed, the baffle (603) is disengaged from the detection area between the two safety light grids (601). The pushing device (11) includes an electromagnet (1108) mounted on the pull rod (605), the electromagnet (1108) being electrically connected to a safety light curtain (601), push blocks (1103) on both side plates (1101), iron plates (1109) cooperating with the electromagnet (1108) on the push blocks (1103), multiple push ropes (1104) connecting the two push blocks (1103), and a groove (1102) for moving the push blocks (1103) along a defined trajectory on the side plate (1101), with a spring (1105) between the push blocks (1103) and the groove (1102), the groove (1102) tilting upwards towards the person; The limiting block (5) is provided with a telescopic rod (801). When the telescopic rod (801) is in the extended state, it is located on the movement path of the baffle (603). The side plate (1101) is provided with an infrared sensor (8). The infrared sensor (8) electrically controls the telescopic rod (801). The top of the extended end of the telescopic rod (801) is provided with a spring three (802). A sleeve (803) is fixedly connected above the spring three (802). The telescopic rod (801) provides movement limit for the sleeve (803), and the inner wall of the sleeve (803) is always in contact with the fixed end of the telescopic rod (801). A feeding platform (10) is fixedly provided on the side of the limiting block (5) near the lower mold (2), and the other end of the feeding platform (10) is pressed against the side of the lower mold (2) so that the distance between the limiting block (5) and the lower mold (2) is equal to the safety distance required by the safety light curtain (601). The pull rod (605) is provided with a pulley (1107), the connecting rope (1106) is wound around the pulley (1107), one end of the connecting rope (1106) is connected to the edge of the pressure plate (602), and the other end of the connecting rope (1106) is fixed to the limiting block (5).

2. The high-safety hardware mold stamping machine according to claim 1, characterized in that: The maximum retraction of the push-away device (11) is equal to the length of the travel of the baffle (603) at one end used to block the safety light curtain (601).

3. The high-safety hardware mold stamping machine according to claim 1, characterized in that: The pressure plate (602) tilts downward at 17° when in its natural state.

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