A stamping equipment with automatic die changing function

Abstract

This invention relates to the field of stamping equipment technology, and more particularly to an automatic die-changing stamping device, comprising an automatic die-loading device, a stamping press, and a controller. The automatic die-loading device transfers the die to the stamping press. The stamping press includes a frame, a stamping power source, a stamping slide, a lower die holder, and an upper die holder. The upper and lower die holders are opposite each other and both are equipped with die-locking structures. A detection mechanism is provided within the upper die holder, which is triggered when a set distance is reached between the upper die holder and the upper die. During die installation, the automatic die-loading device places the die on the lower die holder, the stamping power source moves to the bottom dead center, and then the adjusting mechanism lowers the stamping slide. When the set distance is reached between the upper die holder and the upper die, the detection mechanism is triggered, and the die-locking structures in the upper and lower die holders respectively lock the upper and lower dies. This automatic die-changing stamping device can adapt to dies of different heights, shorten the waiting time required for die changing, and improve production efficiency.

Description

Technical Field

[0001] This invention relates to the field of stamping equipment technology, and in particular to a stamping equipment with automatic die changing capability. Background Technology

[0002] Stamping is a key process in manufacturing and is widely used in the production of parts in industries such as automobiles, home appliances, and electronics.

[0003] The vibration damping and noise-absorbing pads on automotive brake pads are also first produced as blanks through stamping, followed by precision machining. In actual production, due to the variety of vibration damping and noise-absorbing pad models, stamping equipment requires frequent mold changes. Traditional mold changes mainly rely on manual operation. However, different molds have different heights, and the total height of the upper and lower molds changes after wear. When changing molds, it is necessary to ensure that the upper mold holder moves to the bottom dead center and is in contact with the top surface of the upper mold before fixing the upper mold. This prevents damage to the mold during subsequent stamping operations. In stamping equipment, the stamping power source (usually a crank-connecting rod mechanism) is connected to the stamping slide via a ball-end screw. The upper mold holder is mounted on the stamping slide. When the height of the upper mold holder needs to be adjusted, the connection of the threaded joint of the ball-end screw can be adjusted to change the height of the upper mold holder. Previously, when changing molds, the mold was first placed on the stamping equipment, which then moved to its bottom dead center. The operator then lowered the upper mold holder, carefully observing the distance between the upper mold holder and the upper mold. Once contact was ensured, the descent was stopped immediately, and finally, the mold clamping device was used to clamp the mold, completing the installation. However, this existing method undoubtedly takes a long time, affecting normal production. Furthermore, because it is a manual operation, inexperienced operators may find it extremely time-consuming, and improper operation can damage the equipment.

[0004] Therefore, it is necessary to improve existing technologies to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a stamping device with automatic mold changing, which aims to solve the problem of long time consumption when changing molds in the prior art.

[0006] To achieve the above objectives, the present invention provides an automatic die-changing stamping device, comprising an automatic die-loading device, a stamping machine, and a controller. The automatic die-loading device is used to transfer the die to the stamping machine and to retrieve and store the die after retrieving it from the stamping machine. The stamping machine includes a frame, a stamping power source mounted on the frame, a stamping slide that is driven to rise and fall on the frame by the stamping power source, a lower die holder mounted on the frame, and an upper die holder mounted on the stamping slide. An adjustment mechanism for adjusting the height of the stamping slide is provided between the stamping power source and the stamping slide. The upper die holder and the lower die holder are opposite each other and are both provided with die-locking structures. A detection mechanism is provided in the upper die holder. The detection mechanism is triggered and sends a signal to the controller when a set distance value is reached between the upper die holder and the upper die. When installing the die, the automatic die-loading device places the die in the lower die holder, the stamping power source moves to the bottom dead center, and then the adjustment mechanism lowers the stamping slide. When the set distance value is reached between the upper die holder and the upper die, the detection mechanism is triggered, and the controller controls the die-locking structures in the upper and lower die holders to lock the upper die and the lower die, respectively.

[0007] Furthermore, the upper mold frame includes an upper mounting plate, and the detection mechanism includes a movable block that slides vertically on the upper mounting plate, a transmission block that slides horizontally on the upper mounting plate, and a detection element connected to the transmission block. The movable block and the transmission block are connected in a transmission manner, and a spring is provided between the movable block and the upper mounting plate. The spring causes the movable block to tend to protrude downwards from the upper mounting plate. When the movable block is pushed upwards, the transmission block can be pushed by the movable block to the trigger position, at which time the detection element is triggered. When the movable block moves downwards, the transmission block leaves the trigger position, and the detection element is de-triggered.

[0008] Furthermore, there are two movable blocks arranged along the width of the mold. The transmission block is bifurcated and includes two bifurcated sections and a single-head section. The two bifurcated sections are connected to the two movable blocks respectively, and the single-head section is connected to the detection element. The upper mounting plate is provided with a bifurcated slide groove that matches the transmission block.

[0009] Furthermore, each movable block has a hook-shaped structure at its top, with a bottoming plane below the hook-shaped structure. Each forked segment has a limit post at its end, which slides between the hook-shaped structure and the bottoming plane. When two movable blocks rise simultaneously, causing the hook-shaped structures to disengage from the limit posts, the two bottoming planes simultaneously abut against the two forked segments, pushing the transmission block to the trigger position. When only one movable block rises, the hook-shaped structure of the other movable block hooks onto the limit post. The controller detects the resistance when the adjusting mechanism lowers the stamping slide. When the resistance exceeds the set range, the controller controls the adjusting mechanism to stop lowering the stamping slide.

[0010] Furthermore, the stamping equipment also includes a demolding mechanism; the upper die is a concave die with a cavity, and the lower die is a convex die. A demolding ejector block that can slide up and down is provided in the cavity of the upper die, and the demolding ejector block is connected to the top surface of the upper die; the demolding mechanism is connected to the upper die frame, and the demolding mechanism includes a demolding push rod that can push the demolding ejector block from top to bottom; during the stamping operation, before each stamping, the demolding push rod rises and moves away from the demolding ejector block in the upper die, and the demolding ejector block can slide upward; after each stamping, the demolding push rod descends and pushes the demolding ejector block downward to make the product in the cavity fall out of the cavity; when installing the die, the demolding push rod rises.

[0011] Furthermore, the demolding mechanism also includes a pry bar and a demolding cylinder. One end of the pry bar is hinged to the upper mounting plate, and the other end of the pry bar is hinged to the movable end of the demolding cylinder. The fixed end of the demolding cylinder is hinged to the upper mounting plate. The demolding push rod is movably hinged to the middle of the pry bar. The upper mounting plate is provided with a through hole for the demolding push rod to pass through. A spring is provided between the through hole and the demolding push rod, and the spring causes the demolding push rod to tend to rise.

[0012] Furthermore, the locking structure of the upper mold frame includes two positioning mechanisms and two clamping devices. The positioning mechanisms are arranged along the width direction of the mold and include positioning pins that are slidably connected to the upper mounting plate in the vertical direction. The upper mold is provided with positioning holes corresponding to the positioning pins. The two clamping devices clamp the upper mold onto the upper mounting plate from both sides in the width direction of the upper mold. When installing the mold, the clamping devices clamp the mold after the positioning pins are inserted into the positioning holes.

[0013] Furthermore, the positioning mechanism also includes a positioning transmission slider that is slidably connected to the upper mounting plate in the horizontal direction and a positioning drive cylinder that drives the positioning transmission slider to slide. The positioning transmission slider is provided with an inclined slide rail, and the positioning pin is slidably connected to the inclined slide rail.

[0014] Furthermore, the mold clamping device includes a mold clamping base, a proximity drive cylinder, a mold clamping slider, a mold clamping drive cylinder, and a mold clamping rod. The mold clamping base is slidably connected to the upper mounting plate and is driven by the proximity drive cylinder to approach and move away from the upper mold. The mold clamping slider is slidably connected to the mold clamping base and is driven to slide by the mold clamping drive cylinder. The mold clamping slider is provided with an inclined elongated sliding hole. The middle part of the mold clamping rod is hinged to the mold clamping base. One end of the mold clamping rod is slidably connected to the elongated sliding hole, and the other end of the mold clamping rod is the clamping end. The distance from the end of the mold clamping rod slidably connected to the elongated sliding hole to the hinge position is 4 to 10 times the distance from the clamping end to the hinge position.

[0015] Furthermore, the automatic mold loading device includes a storage rack and a pick-and-place arm connected to the storage rack. The pick-and-place arm has three sliding degrees of freedom in the lateral, longitudinal, and vertical directions, as well as one rotational degree of freedom about a vertical axis.

[0016] The present invention provides an automatic mold-changing stamping equipment in which the mold loading and unloading operation is completed by an automatic mold-loading device. After the mold is placed on the stamping machine, the upper mold frame descends. The upper mold frame is equipped with a detection mechanism that descends with the upper mold frame. When the upper mold frame descends to a set distance from the upper mold, the detection mechanism is triggered, and the mold-locking structures on the upper and lower mold frames are activated to lock the upper and lower molds respectively. The entire mold installation process is highly automated and fast, eliminating the need for manpower and time as in existing technologies, shortening the waiting time required for mold changing, and improving production efficiency. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the stamping equipment with automatic mold changing according to the present invention;

[0018] Figure 2 It is a 3D structural diagram of a stamping press;

[0019] Figure 3 It is a three-dimensional structural diagram of the upper mold frame and the lower mold frame;

[0020] Figure 4 This is a 3D structural diagram showing the upper mold frame with some components hidden.

[0021] Figure 5 This is a three-dimensional structural diagram viewed from below the upper mold frame;

[0022] Figure 6 This is a 3D structural diagram showing the upper mold frame concealing the upper mounting plate.

[0023] Figure 7 This is an exploded structure diagram of the testing organization;

[0024] Figure 8 It is a 3D structural diagram of the mold;

[0025] Figure 9 It is a three-dimensional sectional view of the mold;

[0026] Figure 10 This is a three-dimensional sectional view of the demolding mechanism;

[0027] Figure 11 This is a 3D structural diagram of the positioning mechanism;

[0028] Figure 12 This is a 3D structural diagram of the mold clamp.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Automatic mold loading device; 11. Storage rack; 12. Picking and placing arm;

[0031] 2. Stamping machine; 21. Machine frame; 22. Stamping power source; 23. Stamping slide block; 24. Ball end screw; 25. Lower die holder; 26. Upper die holder; 261. Upper mounting plate;

[0032] 3. Detection mechanism; 31. Movable block; 311. Hook-shaped structure; 312. Top plane; 32. Transmission block; 321. Forked section; 322. Single-head section; 323. Limiting post; 324. Roller; 33. Detection element;

[0033] 4. Demolding mechanism; 41. Demolding push rod; 42. Pry bar; 43. Demolding cylinder;

[0034] 51. Upper mold; 511. Mold cavity; 512. Ejector block; 513. Positioning hole; 52. Lower mold;

[0035] 6. Positioning mechanism; 61. Positioning pin; 62. Positioning transmission slider; 621. Inclined slide rail; 63. Positioning drive cylinder;

[0036] 7. Mold clamping device; 71. Mold clamping base; 72. Proximity drive cylinder; 73. Mold clamping slider; 731. Elongated sliding hole; 74. Mold clamping drive cylinder; 75. Mold clamping rod. Detailed Implementation

[0037] The present invention will be described in detail below with reference to specific embodiments.

[0038] In this invention, unless otherwise explicitly specified and limited, terms such as "set in," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or a connection through one or more intermediate media. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The directional terms appearing in this invention are for the purpose of better describing the characteristics of the features and the relationships between them. It should be understood that when the orientation of this invention changes, the orientation of the characteristics of the features and the relationships between them also changes accordingly. Therefore, directional terms do not constitute an absolute spatial limitation on the characteristics of the features and the relationships between them, but only a relative limitation.

[0039] This embodiment provides a stamping device with automatic mold changing capability, such as... Figures 1 to 12 As shown, it includes an automatic die-mounting device 1, a stamping machine 2, and a controller (not shown in the figure). Both the automatic die-mounting device 1 and the stamping machine 2 are controlled by the controller.

[0040] The automatic die-loading device 1 is used to transfer the die to the press 2 and to retrieve and store the die after it has been taken from the press 2. Preferably, the automatic die-loading device 1 includes a storage rack 11 and a pick-and-place arm 12 connected to the storage rack 11. The pick-and-place end of the pick-and-place arm 12 has three sliding degrees of freedom in the lateral, longitudinal, and vertical directions, and one rotational degree of freedom about a vertical axis. The three sliding degrees of freedom and one rotational degree of freedom ensure that the pick-and-place end of the pick-and-place arm 12 can slide to any position on the storage rack 11 to pick up and place the die and smoothly place the die into the press 2. The three sliding degrees of freedom are realized by lead screw and nut pairs in the lateral, longitudinal, and vertical directions, respectively, while the one rotational degree of freedom is realized by a rotary motor. The mutual installation relationship between the lead screw and nut pairs and the rotary motor is prior art and will not be described in detail in this embodiment.

[0041] The stamping press 2 includes a frame 21, a stamping power source 22 (preferably a crank-rocker mechanism in this embodiment) mounted on the frame 21, a stamping slide 23 driven by the stamping power source 22 to move up and down on the frame 21 (an adjustment mechanism for adjusting the height of the stamping slide 23 is provided between the stamping power source 22 and the stamping slide 23, the adjustment mechanism usually includes a ball end screw 24 provided between the stamping slide 23 and the crank-rocker mechanism, by rotating the ball end screw 24, the height of the stamping slide 23 relative to the bottom dead center of the crank-rocker mechanism can be adjusted by means of a threaded connection pair), a lower die holder 25 mounted on the frame 21, and an upper die holder 26 mounted on the stamping slide 23, the upper die holder 26 and the lower die holder 25 are opposite each other and both are provided with a die locking structure. A detection mechanism 3 is installed inside the upper mold base 26. The detection mechanism 3 is triggered when a set distance value is reached between the upper mold base 26 and the upper mold 51. This set distance value is generally 0, that is, the detection mechanism 3 is triggered when the upper mold 51 contacts the upper mold base 26. During mold installation, the automatic mold mounting device 1 places the mold on the lower mold base 25, the stamping power source 22 moves to the bottom dead center, and then the ball screw 24 is adjusted to make the stamping slide 23 and the upper mold base 26 slowly descend together. When the upper mold base 26 contacts the upper mold 51, the detection mechanism 3 is triggered, the controller controls the upper mold base 26 to stop descending, and the controller controls the locking structures in the upper mold base 26 and the lower mold base 25 to lock the upper mold 51 and the lower mold 52 respectively, so as to complete the mold installation. When the mold is used up, the stamping power source 22 also moves to the bottom dead center. Then the mold locking structure releases the lock on the upper mold 51 and the lower mold 52. The lower mold 52 supports the upper mold 51. The pick-and-place arm 12 takes away the mold and puts it back into the storage rack 11. Then the pick-and-place arm 12 takes a new mold and puts it into the stamping machine 2.

[0042] Based on the above structural configuration, the automatic mold-changing stamping equipment's mold-picking and placing operation is completed by the automatic mold-upper device 1. After the mold is placed on the rear stamping press 2, when the upper mold frame 26 descends to the set distance between it and the upper mold 51, the detection mechanism 3 is triggered, and the mold-locking structures on the upper mold frame 26 and the lower mold frame 25 are activated to lock the upper mold 51 and the lower mold 52 respectively. This automatic identification scheme can adapt to molds of different heights. The entire mold installation process is highly automated and fast, without requiring as much manpower and time as existing technologies, thus shortening the waiting time required for mold changing and improving production efficiency.

[0043] In this embodiment, the upper mold frame 26 includes an upper mounting plate 261, and the detection mechanism 3 includes a movable block 31 that slides vertically on the upper mounting plate 261, a transmission block 32 that slides horizontally on the upper mounting plate 261, and a detection element 33 connected to the transmission block 32. The movable block 31 is connected to the transmission block 32 in a transmission manner, and a spring is provided between the movable block 31 and the upper mounting plate 261. The spring causes the movable block 31 to tend to protrude downward from the upper mounting plate 261. When the movable block 31 is pushed upward, the transmission block 32 can be pushed by the movable block 31 to the trigger position, at which time the detection element 33 is triggered. When the movable block 31 moves downward, the transmission block 32 leaves the trigger position, and the detection element 33 is de-triggered. Based on the above structural configuration, before the upper mold base 26 contacts the upper mold 51, the spring causes the movable block 31 to move downwards and protrude from the upper mounting plate 261. As the upper mold base 26 continues to descend and the movable block 31 contacts the upper mold 51, the movable block 31 is continuously pushed upwards, pushing the transmission block 32 towards the trigger position. When the transmission block 32 reaches the trigger position, the detection element 33 is triggered and sends a trigger signal to the controller. The controller then activates the mold clamping structure, and the mold is clamped. After the mold is removed, the movable block 31 is pushed downwards again by the spring, awaiting the installation of the next mold. The detection element 33 can be a contact sensor, distance sensor, or through-beam sensor, used to detect whether the transmission block 32 has reached the set position.

[0044] In this embodiment, two movable blocks 31 are provided, arranged along the width direction of the mold. The transmission block 32 is forked and includes two forked segments 321 and a single-headed segment 322. The two forked segments 321 are connected to the two movable blocks 31 respectively, and the single-headed segment 322 is connected to the detection element 33. The upper mounting plate 261 is provided with a forked sliding groove that matches the transmission block 32. After the transmission block 32 is set in a forked shape, the two forked segments 321 are arranged on both sides separately, which can provide installation space for the demolding mechanism 4 described later.

[0045] In this embodiment, each movable block 31 has a hook-shaped structure 311 at its top, and a bottom surface 312 below the hook-shaped structure 311. Each forked segment 321 has a limit post 323 at its end, which slides between the hook-shaped structure 311 and the bottom surface 312. When both movable blocks 31 rise simultaneously, causing the hook-shaped structure 311 to disengage from the limit post 323, the two bottom surfaces 312 simultaneously abut against the two forked segments 321, pushing the transmission block 32 to the trigger position. When only one movable block 31 rises, the hook-shaped structure 311 of the other movable block 31 hooks onto the limit post 323. The controller detects the resistance when the adjusting mechanism lowers the stamping slide block 23. When the resistance exceeds a set range, the controller controls the adjusting mechanism to stop the lowering of the stamping slide block 23. Based on the above structural design, a stop-work warning can be issued when the mold becomes misaligned. During mold storage and transfer, the upper mold 51 may become misaligned relative to the lower mold 52. For example, the punch and die may not be aligned, causing the punch to not be embedded in the die. This will cause the upper mold 51 to become misaligned relative to the lower mold 52, or more directly, the upper mold 51 to be higher on one side than the lower mold 52. If mold installation is still performed under these circumstances, the equipment will be damaged. The two movable blocks 31 provided in this embodiment can avoid the above problems. During the descent of the upper mold frame 26, if the upper mold 51 is uneven (one side higher than the other), one of the movable blocks 31 will first contact the upper mold 51 and begin to be pushed upwards, causing one side of the forked transmission block 32 to be stressed. However, since the movable block 31 corresponding to the other side of the forked transmission block 32 is not pushed upwards, the other side of the forked transmission block 32 is not subjected to an upward force. The different forces on both sides of the forked transmission block 32 cause the forked transmission block 32 to tilt horizontally, increasing the friction between the forked transmission block 32 and the side wall of the slide, and increasing the sliding resistance. Under these circumstances, the forked transmission block 32 is more difficult to push out, resulting in greater resistance when the adjusting mechanism lowers the stamping slide block 23 (i.e., the lower mold frame 25) compared to the normal situation described above. The controller can determine that the resistance has increased by detecting the current of the adjusting mechanism (usually a motor). After identifying the above situation (the upper mold 51 is tilted), the controller controls the adjusting mechanism to stop descending and issues an alarm for the staff to check.During the mold replacement process, after the upper mold 51 disengages from the upper mounting plate 261, the upper mold 51 no longer abuts against the movable block 31. Under the action of the spring, the movable block 31 returns to its original position and protrudes again from the upper mounting plate 261. During the process of the movable block 31 returning to its original position, the hook structure 311 hooks back the limit post 323, causing the transmission block 32 to also return to its original position. The transmission block 32 then releases the triggering of the detection element 33. A more preferred method is to provide a reset elastic element between the transmission block 32 and the upper mounting plate 261. This reset elastic element causes the transmission block 32 to return to its original position due to the rebound force after the movable block 31 returns to its original position. In practical applications, most detection elements 33 are press-type detection elements. These press-type detection elements have a built-in rebound function. Therefore, the rebound of the press-type detection element can also cause the transmission block 32 to move in the reset direction and cause the limit post 323 to re-enter the hook structure 311 of the movable block 31.

[0046] In this embodiment, the transmission block 32 is equipped with multiple vertically rolling rollers 324, which roll on the upper mounting plate 261. The vertically rolling rollers 324 can reduce the resistance when the transmission block 32 slides, avoiding unnecessary jamming. When the upper mold 51 is uneven, the increased friction is located on the side of the forked transmission block 32, so the vertically rolling rollers 324 do not reduce the lateral friction and do not affect the realization of the separation function.

[0047] In this embodiment, the stamping equipment also includes a demolding mechanism 4; the upper mold 51 is a concave mold with a mold cavity 511, and the lower mold 52 is a convex mold. A demolding ejector block 512 that can slide up and down is provided in the mold cavity 511 of the upper mold 51, and the demolding ejector block 512 is connected to the top surface of the upper mold 51; the demolding mechanism 4 is connected to the upper mold frame 26, and the demolding mechanism 4 includes a demolding push rod 41, which can push the demolding ejector block 512 from top to bottom; during the stamping operation, before each stamping, the demolding push rod 41 rises and moves away from the demolding ejector block 512 in the upper mold 51, and the demolding ejector block 512 can slide upward; after each stamping, the demolding push rod 41 descends and pushes the demolding ejector block 512 downward so that the product in the mold cavity 511 falls out of the mold cavity 511; when installing the mold, the demolding push rod 41 rises. Based on the above structural setup, the product will remain on the upper mold 51 during stamping. During production, after the upper mold 51 is lifted by the upper mold frame 26, the demolding push rod 41 of the demolding mechanism 4 pushes down to push the product out. At the same time, a receiving mechanism that can temporarily extend into the lower part of the upper mold 51 can be set to take away the product. This eliminates the need to set a push spring on each mold and eliminates the need for manual knocking out of the product, simplifying the structure of all molds.

[0048] In this embodiment, the demolding mechanism 4 further includes a pry bar 42 and a demolding cylinder 43. One end of the pry bar 42 is hinged to the upper mounting plate 261, and the other end of the pry bar 42 is hinged to the movable end of the demolding cylinder 43. The fixed end of the demolding cylinder 43 is hinged to the upper mounting plate 261. The demolding push rod 41 is movably hinged to the middle of the pry bar 42. The upper mounting plate 261 is provided with a through hole for the demolding push rod 41 to pass through. A spring is provided between the through hole and the demolding push rod 41, and the spring causes the demolding push rod 41 to tend to rise. The above structure is used to realize the up and down movement of the demolding push rod 41.

[0049] In this embodiment, the locking structure of the upper mold frame 26 includes two positioning mechanisms 6 and two clamping devices 7. The positioning mechanisms 6 are arranged along the width direction of the mold and include positioning pins 61 that are slidably connected to the upper mounting plate 261 in the vertical direction. The upper mold 51 is provided with positioning holes 513 corresponding to the positioning pins 61. The two clamping devices 7 clamp the upper mold 51 onto the upper mounting plate 261 from both sides in the width direction of the upper mold 51. When installing the mold, the clamping devices 7 clamp the mold after the positioning pins 61 are inserted into the positioning holes 513. Based on the above structural configuration, the positioning mechanisms 6 are used to position the upper mold 51 in the horizontal direction (including front-back and left-right). After the horizontal positioning is completed, the clamping devices 7 clamp the mold to complete the vertical positioning.

[0050] In this embodiment, the positioning mechanism 6 further includes a positioning transmission slider 62 slidably connected to the upper mounting plate 261 in the horizontal direction and a positioning drive cylinder 63 for driving the positioning transmission slider 62 to slide. The positioning transmission slider 62 is provided with an inclined slide rail 621, and the positioning pin 61 is slidably connected to the inclined slide rail 621. Based on the above structural configuration, when the positioning drive cylinder 63 extends and retracts, the positioning pin 61 extends out and retracts into the upper mounting plate 261. After the positioning pin 61 extends into the positioning hole 513, it completes the horizontal positioning of the mold.

[0051] In this embodiment, the clamping device 7 includes a clamping base 71, a proximity drive cylinder 72, a clamping slider 73, a clamping drive cylinder 74, and a clamping rod 75. The clamping base 71 is slidably connected to the upper mounting plate 261 and is driven by the proximity drive cylinder 72 to approach and move away from the upper mold 51. The clamping slider 73 is slidably connected to the clamping base 71 and is driven to slide by the clamping drive cylinder 74. The clamping slider 73 is provided with an inclined elongated sliding hole 731. The middle part of the clamping rod 75 is hinged to the clamping base 71. One end of the clamping rod 75 is slidably connected to the elongated sliding hole 731, and the other end of the clamping rod 75 is a clamping end. The distance from the end of the clamping rod 75 slidably connected to the elongated sliding hole 731 to the hinge position is 4 to 10 times the distance from the clamping end to the hinge position. Based on the above structural configuration, when clamping the mold, the drive cylinder 72 moves first to bring the entire clamping base 71 closer to the upper mold 51. Then, the clamping drive cylinder 74 presses down the clamping end of the clamping rod 75 to clamp the upper mold 51. Due to the relationship between the elongated sliding hole 731 and the lever ratio, the force of the clamping drive cylinder 74 can be greatly amplified, increasing the clamping force of the clamping rod 75.

[0052] It is easy to understand that the lower mold frame 25 is also equipped with two positioning mechanisms 6 and two clamping devices 7. The structure and working principle of the positioning mechanisms 6 and clamping devices 7 of the lower mold frame 25 are the same as those of the upper mold 51.

[0053] In summary, this type of automatic die-changing stamping equipment can adapt to dies of different heights, shorten the waiting time required for die changing, and improve production efficiency.

[0054] Where there is no conflict, the above embodiments and features can be combined with each other.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A stamping device with automatic die changing, characterized in that: The system includes an automatic die-loading device (1), a stamping press (2), and a controller. The automatic die-loading device (1) is used to transfer the die to the stamping press (2) and to retrieve and store the die after it has been removed from the stamping press (2). The stamping press (2) includes a frame (21), a stamping power source (22) mounted on the frame (21), a stamping slide (23) driven by the stamping power source (22) to move up and down on the frame (21), a lower die holder (25) mounted on the frame (21), and an upper die holder (26) mounted on the stamping slide (23). An adjustment mechanism for adjusting the height of the stamping slide (23) is provided between the stamping power source (22) and the stamping slide (23). The upper die holder (26) and the lower die holder (25) are also included. Both are equipped with locking structures; a detection mechanism (3) is provided in the upper mold frame (26). The detection mechanism (3) is triggered and sends a signal to the controller when the upper mold frame (26) and the upper mold (51) reach a set distance value; when the mold is installed, the automatic mold mounting device (1) places the mold on the lower mold frame (25), the stamping power source (22) moves to the bottom dead center, and then the adjustment mechanism causes the stamping slide (23) to descend. When the upper mold frame (26) and the upper mold (51) reach a set distance value, the detection mechanism (3) is triggered, and the controller controls the locking structures in the upper mold frame (26) and the lower mold frame (25) to lock the upper mold (51) and the lower mold (52) respectively. The upper mold frame (26) includes an upper mounting plate (261), and the detection mechanism (3) includes a movable block (31) that slides vertically on the upper mounting plate (261), a transmission block (32) that slides horizontally on the upper mounting plate (261), and a detection element (33) connected to the transmission block (32). The movable block (31) is connected to the transmission block (32) in a transmission manner. A spring is provided between the movable block (31) and the upper mounting plate (261). The spring causes the movable block (31) to tend to protrude downward from the upper mounting plate (261). When the movable block (31) is pushed upward, the transmission block (32) can be pushed by the movable block (31) to the trigger position. At this time, the detection element (33) is triggered. When the movable block (31) moves downward, the transmission block (32) leaves the trigger position, and the detection element (33) is de-triggered. There are two movable blocks (31), which are arranged along the width of the mold. The transmission block (32) is bifurcated and includes two bifurcated sections (321) and a single-head section (322). The two bifurcated sections (321) are connected to the two movable blocks (31) respectively, and the single-head section (322) is connected to the detection element (33). The upper mounting plate (261) is provided with a bifurcated slide groove that matches the transmission block (32). Each movable block (31) has a hook-shaped structure (311) at its top and a bottoming plane (312) below it. Each forked segment (321) has a limit post (323) at its end. The limit post (323) slides between the hook-shaped structure (311) and the bottoming plane (312). When both movable blocks (31) rise simultaneously and the hook-shaped structure (311) disengages from the limit post (323), the transmission block (32) is pushed to the trigger position when the two bottoming planes (312) simultaneously abut against the two forked segments (321). When only one movable block (31) rises, the hook-shaped structure (311) of the other movable block (31) hooks the limit post (323). The controller detects the resistance when the adjustment mechanism lowers the stamping slider (23). When the resistance is greater than the set range value, the controller controls the adjustment mechanism to stop lowering the stamping slider (23).

2. The stamping equipment with automatic die changing according to claim 1, characterized in that: The stamping equipment also includes a demolding mechanism (4); the upper mold (51) is a concave mold and is provided with a mold cavity (511), the lower mold (52) is a convex mold, and a demolding top block (512) that can slide up and down is provided in the mold cavity (511) of the upper mold (51), and the demolding top block (512) is connected to the top surface of the upper mold (51); the demolding mechanism (4) is connected to the upper mold frame (26), and the demolding mechanism (4) includes a demolding push rod (41), which can push the demolding top block (512) from top to bottom; During the stamping operation, before each stamping, the ejector pin (41) rises and moves away from the ejector block (512) in the upper die (51), allowing the ejector block (512) to slide upwards; after each stamping, the ejector pin (41) descends and pushes the ejector block (512) downwards so that the product in the mold cavity (511) falls out of the mold cavity (511); When installing the mold, the demolding push rod (41) rises.

3. The stamping equipment with automatic die changing according to claim 2, characterized in that: The demolding mechanism (4) also includes a pry bar (42) and a demolding cylinder (43). One end of the pry bar (42) is hinged to the upper mounting plate (261), and the other end of the pry bar (42) is hinged to the movable end of the demolding cylinder (43). The fixed end of the demolding cylinder (43) is hinged to the upper mounting plate (261). The demolding push rod (41) is movably hinged to the middle of the pry bar (42). The upper mounting plate (261) is provided with a through hole for the demolding push rod (41) to pass through. A spring is provided between the through hole and the demolding push rod (41). The spring causes the demolding push rod (41) to tend to rise.

4. The stamping equipment with automatic die changing according to claim 1, characterized in that: The mold-locking structure of the upper mold frame (26) includes two positioning mechanisms (6) and two mold clamps (7). The positioning mechanisms (6) are arranged along the width direction of the mold. The positioning mechanism (6) includes a positioning pin (61) that is slidably connected to the upper mounting plate (261) in the vertical direction. The upper mold (51) is provided with a positioning hole (513) corresponding to the positioning pin (61). The two mold clamps (7) clamp the upper mold (51) onto the upper mounting plate (261) from both sides of the width direction of the upper mold (51). When installing the mold, after the positioning pin (61) is inserted into the positioning hole (513), the mold clamp (7) clamps it.

5. The stamping equipment with automatic die changing according to claim 4, characterized in that: The positioning mechanism (6) also includes a positioning transmission slider (62) that is slidably connected to the upper mounting plate (261) in the horizontal direction and a positioning drive cylinder (63) that drives the positioning transmission slider (62) to slide. The positioning transmission slider (62) is provided with an inclined slide (621), and the positioning pin (61) is slidably connected to the inclined slide (621).

6. The stamping equipment with automatic die changing according to claim 4, characterized in that: The clamping device (7) includes a clamping base (71), a proximity drive cylinder (72), a clamping slider (73), a clamping drive cylinder (74), and a clamping rod (75). The clamping base (71) is slidably connected to the upper mounting plate (261) and is driven by the proximity drive cylinder (72) to approach and move away from the upper mold (51). The clamping slider (73) is slidably connected to the clamping base (71) and is driven to slide by the clamping drive cylinder (74). The clamping slider (73) is provided with an inclined elongated sliding hole (731). The middle part of the clamping rod (75) is hinged to the clamping base (71). One end of the clamping rod (75) is slidably connected to the elongated sliding hole (731). The other end of the clamping rod (75) is the clamping end. The distance from the end of the clamping rod (75) slidably connected to the elongated sliding hole (731) to the hinge position is 4 to 10 times the distance from the clamping end to the hinge position.

7. The stamping equipment with automatic die changing according to any one of claims 1 to 6, characterized in that: The automatic mold loading device (1) includes a storage rack (11) and a pick-and-place arm (12) connected to the storage rack (11). The pick-and-place arm (12) has three sliding degrees of freedom in the horizontal, longitudinal and vertical directions, and one rotational degree of freedom about the vertical axis.

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