A step-by-step mold opening mechanism for die casting molds

Abstract

The present application relates to the technical field of die casting mould, and discloses a step-by-step mold opening mechanism of die casting mould, which comprises a head plate, a second plate, a third plate, a locking block and a poking block, the locking block comprises an unlocking part, a hinged part and a locking part, the third plate is provided with a locking groove, and the locking part is movably locked in the locking groove; the poking block has a fixed part and a poking part, and a recess is formed between the fixed part and the poking part; when the die casting mould is opened by a first preset distance, the locking part is locked in the locking groove; the second plate and the third plate move cooperatively away from the head plate; when the die casting mould is opened by a second preset distance, the poking part abuts against the unlocking part and drives the locking block to rotate, so that the locking part is separated from the locking groove; when the die casting mould is opened by a third preset distance, the second plate and the head plate remain relatively static, and the third plate moves away from the second plate. The step-by-step mold opening mechanism has the advantages of simple structure and prevention of the third plate from being separated from the second plate in advance.

Description

Technical Field

[0001] This invention relates to the field of die casting mold technology, and more particularly to a step-by-step mold opening mechanism for die casting molds. Background Technology

[0002] The choice of gating method is one of the key factors determining the quality of die-cast products. With the diversification of gating methods and the increasing complexity of die-cast products, the application of three-plate die-casting molds is becoming more and more common. For three-plate die-casting molds, it is necessary to strictly control the mold opening sequence of the three plates (i.e., the head plate, the second plate, and the third plate). The head plate and the second plate should be separated first, followed by the separation of the third plate and the second plate. This step-by-step mold opening ensures that the die-cast product can be successfully demolded, leaving the die-cast product in the moving mold for the ejection mechanism to push out.

[0003] The existing three-plate die-casting mold has a step-by-step mold opening mechanism, which is structurally complex. When the bonding force between the head plate and the middle plate is large, the third plate is prone to separating from the second plate first.

[0004] For example, patent "CN113145827A" discloses a step-by-step die-casting mold and a step-by-step mold-opening method. In this die-casting mold, a pull block is set on the fixed mold plate, a pulling bolt is set on the intermediate plate, and a clamping mechanism is set on the moving mold plate. In the initial stage of mold opening, the clamping mechanism clamps the moving mold plate and the intermediate plate, so the intermediate plate and the moving mold plate first separate from the fixed mold plate together. After the mold has opened a certain distance, the pull block and the pulling bolt abut against each other, forcing the clamping mechanism to fail, the moving mold plate separates from the intermediate plate, and the clamping mechanism remains on the moving mold plate. In this solution, step-by-step mold opening requires setting pull blocks, pulling bolts, and clamping mechanisms on the fixed mold plate, intermediate plate, and moving mold plate respectively, resulting in a complex structure. Moreover, when the adhesive force between the fixed mold plate and the intermediate plate is large, the clamping mechanism will fail, and the moving mold plate and the intermediate plate will separate first, affecting the normal mold opening sequence. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by the present invention is to propose a step-by-step mold opening mechanism for a die-casting mold that is simple in structure and can prevent the second and third plates from opening the mold first by mistake.

[0006] The technical solution adopted by this invention to solve its technical problem is to propose a step-by-step mold opening mechanism for a die-casting mold, comprising:

[0007] A head plate, a second plate, and a third plate are arranged sequentially from top to bottom, and the head plate, the second plate, and the third plate move and abut against each other in sequence; the second plate has a first mounting groove on the side near the third plate, and the third plate has a second mounting groove on the side near the second plate. The first mounting groove and the second mounting groove are used to install the fixed mold core and the moving mold core of the die-casting mold, respectively; a guide post is provided between the head plate, the guide post is fixedly connected to the head plate, and the guide post has a sliding groove; a limiting block is fixedly connected to the second plate, and the limiting block is located in the sliding groove;

[0008] The device includes a locking block and a toggle block. The locking block comprises an unlocking part, a hinge part, and a locking part arranged sequentially from top to bottom. A hinge seat is provided on the second plate, and the hinge part is hinged to the hinge seat. A locking groove is provided on the third plate, and the locking part is movably locked in the locking groove. One end of the toggle block has a fixed part, and the other end has a toggle part, with the fixed part and the toggle part forming a groove. The fixed part is fixedly connected to the head plate.

[0009] When the die-casting mold opens a first preset distance: the locking part locks in the locking groove; the second plate and the third plate move together away from the head plate, and remain relatively stationary; the unlocking part slides along the groove; the limiting block slides along the slide groove.

[0010] When the die-casting mold opens to the second preset distance: the actuating part abuts against the unlocking part and drives the locking block to rotate, so that the locking part disengages from the locking groove;

[0011] When the die-casting mold opens to the third preset distance: the limiting block abuts against the guide post, the second plate and the head plate remain relatively stationary, and the third plate moves away from the second plate.

[0012] Furthermore, the second preset distance is greater than the first preset distance, and the third preset distance is greater than the second preset distance.

[0013] Furthermore, a reset elastic element is provided on the upper edge of the second plate near the unlocking part, and the locking block moves against the reset elastic element;

[0014] When the actuating part abuts against the unlocking part, the locking block compresses the reset elastic element.

[0015] Furthermore, the actuating block and the locking block are arranged side by side along the circumference of the head plate and the second plate, and the unlocking part is a sliding pin extending from the locking block toward the actuating block side;

[0016] The groove has a plane extending from top to bottom, and the actuating part has an inclined surface that gradually slopes towards the head plate from top to bottom. The inclined surface is connected to the plane, and the sliding pin can slide along the plane to the inclined surface.

[0017] Furthermore, the bottom of the actuating part is provided with a first chamfer near the head plate, and the inclination direction of the first chamfer is opposite to the inclination direction of the inclined surface;

[0018] The sliding pin can slide into the groove from bottom to top along the first chamfer.

[0019] Furthermore, the locking part is provided with a second chamfer on the side near the second plate, and the second chamfer gradually tilts from bottom to top towards the side near the second plate.

[0020] Furthermore, the lock groove is provided with a stop block that is detachably connected to the three plates. When the locking part is locked in the lock groove, the locking part abuts against the stop block.

[0021] Furthermore, the hinged seat includes a first support plate, a second support plate, and a connecting plate connected between the first support plate and the second support plate. The connecting plate is in contact with the two plates. Both the first support plate and the second support plate are perpendicular to the two plates, and both the first support plate and the second support plate are fixedly connected to the two plates by bolts.

[0022] Each of the first support plate, the second support plate, and the hinge portion has a through hole. A rotating shaft passes through the through holes of the first support plate, the hinge portion, and the second support plate in sequence to hinge the locking block to the hinge seat.

[0023] Furthermore, a plurality of actuating blocks are provided along the circumference of the head plate, and a plurality of locking blocks are provided along the circumference of the second plate, wherein the locking blocks correspond one-to-one with the actuating blocks.

[0024] Furthermore, the sum of the widths of the locking block and the toggle block is less than or equal to 10 centimeters.

[0025] Compared with the prior art, the present invention has at least the following beneficial effects:

[0026] In this invention, by setting a toggle block on the head plate and a locking block on the second plate, the opening sequence of the head plate, second plate, and third plate is controlled, achieving a simple step-by-step mold opening structure. When the mold opens a first preset distance, the unlocking part moves downward along the groove without unlocking the locking block. The locking block locks the second and third plates, and the second plate, together with the third plate, moves backward and separates from the head plate, allowing the mold opening between the head plate and the second plate to proceed first. Due to the locking effect of the locking block, the third plate will not accidentally detach from the second plate first due to the greater adhesion force between the second plate and the head plate. When the mold opens a second preset distance, the toggle part abuts against the unlocking part, driving the locking part to disengage from the locking groove, and the locking block no longer locks the second and third plates. The die-casting mold continues to open. When the mold opens a third preset distance, the cooperation between the limiting block and the guide post keeps the second plate and the head plate relatively stationary, while the third plate moves away from the second plate, allowing the mold opening between the third plate and the second plate to be completed, thus finishing the step-by-step mold opening of the die-casting mold. The entire step-by-step mold opening structure is simple and avoids the situation where the third plate accidentally opens the mold from the second plate first. Moreover, the locking block is installed on the second plate. After the die-casting mold is fully opened, the locking block remains on the second plate instead of the third plate. The robot arm extends from above the third plate to remove the die-cast product, and the locking block will not interfere with the robot arm's part removal.

[0027] In this invention, both the actuating block and the locking block can be designed as long and thin strips, making full use of the longitudinal space of the die-casting mold while occupying less transverse space. The sum of the widths of the locking block and the actuating block can be less than or equal to ten centimeters, and they are convenient to arrange along the circumference of the die-casting mold, which can prevent interference with the oil cylinders and water pipes around the die-casting mold. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the step-by-step mold opening mechanism of the present invention;

[0029] Figure 2 for Figure 1 Schematic diagram of the structure after removing the head plate, second plate, and third plate;

[0030] Figure 3 for Figure 2 Side view;

[0031] Figure 4 for Figure 2 Exploded view;

[0032] Figure 5 A plan view of the mold opening mechanism at the first preset distance (guide pillars omitted);

[0033] Figure 6 A plan view of the mold opening mechanism at the second preset distance (guide pillars omitted);

[0034] Figure 7A perspective view of the mold opening mechanism at the second preset distance (guide pillars omitted);

[0035] Figure 8 A plan view of the mold opening mechanism at the third preset distance (guide pillars omitted);

[0036] Figure 9 A 3D view of the mold opening mechanism at the third preset distance (guide pillars omitted);

[0037] Figure 10 This is a schematic diagram of the assembly of the guide post and the limiting block.

[0038] In the picture:

[0039] 1. Head plate; 10. Guide post; 101. Slide groove;

[0040] 2. Second plate; 20. First mounting slot; 21. Reset elastic element; 22. Limiting block;

[0041] 3. Three plates; 30. Second mounting slot; 31. Hinge seat; 32. Locking slot; 310. First support plate; 311. Second support plate; 312. Connecting plate; 313. Rotating shaft; 321. Abutment block;

[0042] 4. Locking block; 40. Unlocking part; 41. Hinge part; 42. Locking part; 421. Second chamfer;

[0043] 5. Actuating block; 50. Fixing part; 51. Actuating part; 52. Groove; 511. Inclined surface; 512. First chamfer; 520. Plane. Detailed Implementation

[0044] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0045] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0046] Furthermore, in this invention, descriptions involving terms such as "first," "second," and "a" are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0049] like Figure 1 , Figure 2 and Figure 10 As shown, a step-by-step mold opening mechanism for a die-casting mold mainly includes: a head plate 1, a second plate 2, a third plate 3, a locking block 4, and a toggle block 5.

[0050] A head plate 1, a second plate 2, and a third plate 3 are arranged sequentially from top to bottom. These plates move and abut against each other, specifically, the head plate 1 abuts against the second plate 2, and the second plate 2 abuts against the third plate 3. The second plate 2 has a first mounting groove 20 on its side near the third plate 3, and the third plate 3 has a second mounting groove 30 on its side near the second plate 2. The first mounting groove 20 and the second mounting groove 30 are used to mount the fixed mold core and the moving mold core of the die-casting mold, respectively. The fixed mold core is fixedly connected to the second plate 2, and the moving mold core is fixedly connected to the third plate 3. Therefore, after die-casting is completed and the third plate 3 separates from the second plate 2, the moving mold core separates from the fixed mold core, while the die-cast product remains on the moving mold core, facilitating the ejection mechanism in the die-casting mold to eject the die-cast product from the moving mold core.

[0051] A guide post 10 is provided between the head plate 1, the second plate 2, and the third plate 3. The guide post 10 is a long rectangular parallelepiped and is fixedly connected to the head plate 1 by bolts. A sliding groove 101 is provided on the guide post 10. A limiting block 22 is fixedly connected to the second plate 2 by bolts and is located within the sliding groove 101. The guide post 10 provides guidance during the mold opening and closing processes of the second plate 2 and the third plate 3. When the third plate 3 and the second plate 2 move downwards relative to the head plate 1 to open the mold, the limiting block 22 slides along the sliding groove 101; during this process, the limiting block 22 does not provide any limiting function. Once the mold opening distance between the second plate 2 and the head plate 1 has met the mold opening requirements, and mold opening between the second plate 2 and the third plate 3 is required, it is necessary to ensure that the second plate 2 no longer moves downward relative to the head plate 1. Therefore, at this time, the limiting block 22 abuts against the guide post 10, that is, the limiting block 22 abuts against the bottom end of the slide groove 101, and the limiting block 22 performs its limiting function, preventing the second plate 2 from moving downward relative to the head plate 1. Specifically, the guide post 10 can be set at each of the four corners of the head plate 1, and the guide post 10 is fixedly connected to the head plate 1 by bolts. The limiting block 22, corresponding to the guide post 10, is set at each of the four corners of the second plate 2, and the limiting block 22 is fixed to the second plate 2 by bolts. For ease of processing, the guide post 10 can be set as a split type.

[0052] The locking block 4 includes an unlocking part 40, a hinge part 41, and a locking part 42 arranged sequentially from top to bottom. The unlocking part 40 is a sliding pin extending from the locking block 4 toward the actuating block 5. The second plate 2 is provided with a hinge seat 31, and the hinge part 41 is hinged to the hinge seat 31. The third plate 3 is provided with a locking groove 32, and the locking part 42 is movably locked in the locking groove 32. One end of the actuating block 5 has a fixing part 50, and the other end of the actuating block 5 has a actuating part 51. The fixing part 50 and the actuating part 51 form a groove 52. The fixing part 50 is fixedly connected to the head plate 1 by bolts. When the die-casting mold is in the closed state, that is, the head plate 1, the second plate 2, and the third plate 3 are in a state of sequential abutment, the sliding pin is in the groove 52 on the actuating block 5, the locking part 42 is locked in the locking groove 32, and both the locking block 4 and the actuating block 5 are in a vertical state.

[0053] Specifically, the hinge seat 31 includes a first support plate 310, a second support plate 311, and a connecting plate 312 connected between the first support plate 310 and the second support plate 311. The connecting plate 312 is in contact with the second plate 2. Both the first support plate 310 and the second support plate 311 are perpendicular to the second plate 2, and both are fixedly connected to the second plate 2 by bolts. A total of four bolts detachably fix the hinge seat 31 to the second plate 2, ensuring that the hinge seat 31 is reliably fixed and easy to disassemble and assemble. The hinge seat 31 protrudes from the second plate 2 as a whole. The first support plate 310, the second support plate 311, and the hinge portion 41 are each provided with a through hole. A rotating shaft 313 passes through the through holes of the first support plate 310, the hinge portion 41, and the second support plate 311 in sequence to hinge the locking block 4 to the hinge seat 31. The locking block 4 can rotate relative to the rotating shaft 313 so that the locking portion 42 is locked into the locking groove 32, or the locking portion 42 is disengaged from the locking groove 32.

[0054] The upper edge of the second plate 2 near the unlocking part 40 is provided with a reset elastic element 21, and the locking block 4 moves against the reset elastic element 21. When the actuating part 51 abuts against the unlocking part 40, the locking block 4 compresses the reset elastic element 21. The reset elastic element 21 can be composed of a bolt, a spring, and a sleeve. When the die-casting mold is in the closed state, the reset elastic element 21 abuts against the end of the locking block 4 near the unlocking part 40, ensuring that the locking block 4 is reliably locked in the locking groove 32. The reset elastic element 21 is perpendicular to the locking block 4, and the force it exerts on the locking block 4 is outward. When the sliding pin slides onto the actuating part 51, the actuating part 51 pushes the sliding pin inward, so that the reset elastic element 21 is compressed by the locking block 4. After the die-casting mold is opened, when the mold is closed and reset, the elastic force of the reset elastic element 21 can lock the locking part 42 into the locking groove 32.

[0055] like Figures 2-4 As shown, the actuating block 5 and the locking block 4 are arranged side by side along the circumference of the head plate 1 and the second plate 2. Specifically, a plurality of actuating blocks 5 are provided along the circumference of the head plate 1, and a plurality of locking blocks 4 are provided along the circumference of the second plate 2. The locking blocks 4 correspond one-to-one with the actuating blocks 5, and the sum of the widths of the locking blocks 4 and the actuating blocks 5 is less than or equal to 10 centimeters.

[0056] In actual use, both the actuating block 5 and the locking block 4 in this embodiment can be set as a long and thin strip structure, which can make full use of the longitudinal space of the die-casting mold while occupying less lateral space. The sum of the widths of the locking block 4 and the actuating block 5 can be less than or equal to ten centimeters, and they are convenient to arrange along the circumference of the die-casting mold, which can prevent interference with the oil cylinder and water pipe and other structures around the die-casting mold.

[0057] The groove 52 has a plane 520 extending downwards, and the actuating part 51 has an inclined surface 511 that gradually slopes downwards towards the head plate 1. The inclined surface 511 is connected to the plane 520, and the sliding pin can slide along the plane 520 to the inclined surface 511. In the initial stage of die-casting mold opening, the sliding pin slides along the plane 520; when the sliding pin slides onto the inclined surface 511, the inclined surface 511 pushes the sliding pin inwards, causing the unlocking part 40 of the locking block 4 to move inwards, and the locking part 42 of the locking block 4 to move outwards, thus forming a lever structure, so that the locking part 42 gradually disengages from the locking groove 32.

[0058] The bottom of the actuating part 51 is provided with a first chamfer 512 near the head plate 1, and the inclination direction of the first chamfer 512 is opposite to the inclination direction of the inclined surface 511; the sliding pin can slide from bottom to top into the groove 52 along the first chamfer 512. After the sliding pin slides out of the groove 52 and the actuating part 51, it can slide upward from the first chamfer 512 back into the actuating part 51 and the groove 52.

[0059] The locking part 42 is provided with a second chamfer 421 near the second plate 2. The second chamfer 421 gradually tilts towards the second plate 2 from bottom to top. After the locking part 42 is disengaged from the locking groove 32, when the locking part 42 needs to be locked back into the locking groove 32, the third plate 3 can first abut against the second chamfer 421 and push the locking block 4 outward. As the third plate 3 moves upward, the locking part 42 can be smoothly locked into the locking groove 32.

[0060] The locking groove 32 is provided with a stop block 321 that is detachably connected to the three plates 3. When the locking part 42 is locked in the locking groove 32, the locking part 42 abuts against the stop block 321. The hardness of the stop block 321 is higher than that of the three plates 3 because the stop block 321 needs to repeatedly contact and rub against the locking block 4 during use, and it is also convenient to replace the stop block 321.

[0061] like Figure 5 As shown, when the die-casting mold opens to the first preset distance, the locking part 42 is locked in the locking groove 32. At this time, the second plate 2 and the third plate 3 are locked together by the locking block 4. As long as no force is applied to the unlocking part 40, the locking part 42 cannot disengage from the locking groove 32. The second plate 2 and the third plate 3 move together away from the head plate 1, and the second plate 2 and the third plate 3 remain relatively stationary. The unlocking part 40 slides along the groove 52, and the limiting block 22 slides along the slide groove 101. Figure 5 In this context, H1 represents the first preset distance.

[0062] like Figures 6-7As shown, when the die-casting mold opens to the second preset distance: the actuating part 51 abuts against the unlocking part 40 and drives the locking block 4 to rotate, so that the locking part 42 disengages from the locking groove 32. The sliding pin slides along the inclined surface 511 on the actuating part 51, and the inclined surface 511 abuts against the sliding pin inward, so that the locking block 4 rotates along the rotating shaft 313. At this time, the locking block 4 is equivalent to a lever. The end near the unlocking part 40 moves inward, further compressing the reset elastic element 21; the end near the locking part 42 moves outward, and the locking part 42 disengages from the locking groove 32, thus releasing the lock between the three plates 3 and the two plates 2. Figure 6 In this context, H1+H2 is the second preset distance, which is the distance H2 that is added on top of the first preset distance.

[0063] like Figures 8-9 As shown, when the die-casting mold opens to the third preset distance: the limiting block 22 abuts against the guide post 10, limiting the second plate 2. The second plate 2 can no longer continue to open downwards. Since the second plate 2 and the head plate 1 have been limited by the guide post 10 and the limiting block 22, the second plate 2 and the head plate 1 remain relatively stationary. The third plate 3 moves away from the second plate 2, completing the step-by-step opening of the die-casting mold. Figure 8 In the middle, for Figure 6 Based on the initial mold opening, another H3 distance is added, completing the step-by-step mold opening of the die-casting mold. Therefore, H1 + H2 + H3 constitutes the third preset distance. It can be concluded that the second preset distance is greater than the first preset distance, and the third preset distance is greater than the second preset distance.

[0064] In practical use, this embodiment uses a toggle block 5 on the head plate 1 and a locking block 4 on the second plate 2 to control the opening sequence of the head plate 1, second plate 2, and third plate 3, thus achieving a simple step-by-step mold opening structure for the die-casting mold. When the mold opens to the first preset distance, the unlocking part 40 moves downward along the groove 52 without unlocking the locking block 4. The locking block 4 locks the second plate 2 and the third plate 3, and the second plate 2, together with the third plate 3, moves backward and separates from the head plate 1, allowing the mold opening between the head plate 1 and the second plate 2 to proceed first. Due to the locking effect of the locking block 4, the third plate 3 will not accidentally detach from the second plate 2 first because the adhesion force between the second plate 2 and the head plate 1 is greater. When the mold opens to the second preset distance, the toggle part 51 abuts against the unlocking part 40, driving the locking part 42 to disengage from the locking groove 32, and the locking block 4 no longer locks the second plate 2 and the third plate 3. The die-casting mold continues to open. When the mold has opened a third preset distance, plate 3 moves away from plate 2, causing the mold to open between plate 3 and plate 2, thus completing the step-by-step mold opening of the die-casting mold. The entire step-by-step mold opening structure is simple and avoids the situation where plate 3 accidentally opens from plate 2 first. Furthermore, the locking block 4 is installed on plate 2. After the die-casting mold is fully opened, the locking block 4 remains on plate 2, not on plate 3. The robotic arm extends from above plate 3 to remove the die-cast product, and the locking block 4 does not interfere with the robotic arm's removal of the part.

[0065] In this design, the step-by-step mold opening mechanism of the die-casting mold is simple in structure and can prevent the third plate 3 from accidentally detaching from the second plate 2 first.

Claims

1. A step-by-step mold opening mechanism for a die-casting mold, characterized in that, include: A head plate, a second plate, and a third plate are arranged sequentially from top to bottom, and the head plate, the second plate, and the third plate move and abut against each other in sequence; the second plate has a first mounting groove on the side near the third plate, and the third plate has a second mounting groove on the side near the second plate. The first mounting groove and the second mounting groove are used to install the fixed mold core and the moving mold core of the die-casting mold, respectively; a guide post is provided between the head plate, the guide post is fixedly connected to the head plate, and the guide post has a sliding groove; a limiting block is fixedly connected to the second plate, and the limiting block is located in the sliding groove; The device comprises a locking block and a toggle block. The locking block includes an unlocking part, a hinge part, and a locking part arranged sequentially from top to bottom. A hinge seat is provided on the second plate, and the hinge part is hinged to the hinge seat. A locking groove is provided on the third plate, and the locking part is movably locked in the locking groove. One end of the toggle block has a fixed part, and the other end has a toggle part. The fixed part and the toggle part form a groove, and the fixed part is fixedly connected to the head plate. Both the toggle block and the locking block are arranged in a long strip shape to utilize the longitudinal space of the molding die. The toggle block and the locking block are arranged side by side along the circumference of the head plate and the second plate. The unlocking part is a sliding pin extending from the locking block toward the toggle block. The groove has a plane extending from top to bottom, and the toggle part has an inclined surface that gradually slopes toward the head plate from top to bottom. The inclined surface is connected to the plane, and the sliding pin can slide along the plane to the inclined surface. The sum of the widths of the locking block and the toggle block is less than or equal to 10 centimeters; When the die-casting mold opens a first preset distance: the locking part locks in the locking groove; the second plate and the third plate move together away from the head plate, and remain relatively stationary; the unlocking part slides along the groove; the limiting block slides along the slide groove. When the die-casting mold opens to the second preset distance: the actuating part abuts against the unlocking part, causing the locking block to rotate, the inclined surface to push the sliding pin inward, the unlocking part of the locking block moves inward, and the locking part of the locking block moves outward, forming a lever structure so that the locking part gradually disengages from the locking groove; When the die-casting mold opens to the third preset distance: the limiting block abuts against the guide post, limiting the second plate so that the second plate can no longer open the mold downwards. The second plate and the head plate are limited by the guide post and the limiting block. The second plate and the head plate remain relatively stationary. The third plate moves away from the second plate. After the die-casting mold is fully opened, the locking block remains on the second plate so that the robot arm can reach in from above the third plate to remove the die-cast product, thus avoiding interference from the locking block to the robot arm during the part removal process.

2. The step-by-step mold opening mechanism of the die-casting mold according to claim 1, characterized in that, The second preset distance is greater than the first preset distance, and the third preset distance is greater than the second preset distance.

3. The step-by-step mold opening mechanism of the die-casting mold according to claim 1, characterized in that, The upper edge of the second plate is provided with a reset elastic element near the unlocking part, and the locking block moves against the reset elastic element; When the actuating part abuts against the unlocking part, the locking block compresses the reset elastic element.

4. The step-by-step mold opening mechanism of the die-casting mold according to claim 1, characterized in that, The bottom of the actuating part is provided with a first chamfer near the head plate, and the inclination direction of the first chamfer is opposite to the inclination direction of the inclined surface; The sliding pin can slide into the groove from bottom to top along the first chamfer.

5. The step-by-step mold opening mechanism of the die-casting mold according to claim 1, characterized in that, The locking part is provided with a second chamfer on the side near the second plate, and the second chamfer gradually tilts from bottom to top towards the side near the second plate.

6. The step-by-step mold opening mechanism of the die-casting mold according to claim 1, characterized in that, The locking groove is provided with a stop block that is detachably connected to the three plates. When the locking part is locked in the locking groove, the locking part abuts against the stop block.

7. The step-by-step mold opening mechanism of the die-casting mold according to claim 1, characterized in that, The hinged seat includes a first support plate, a second support plate, and a connecting plate connected between the first support plate and the second support plate. The connecting plate is in contact with the two plates. Both the first support plate and the second support plate are perpendicular to the two plates, and both the first support plate and the second support plate are fixedly connected to the two plates by bolts. Each of the first support plate, the second support plate, and the hinge portion has a through hole. A rotating shaft passes through the through holes of the first support plate, the hinge portion, and the second support plate in sequence to hinge the locking block to the hinge seat.

8. The step-by-step mold opening mechanism of the die-casting mold according to claim 1, characterized in that, Multiple actuating blocks are provided along the circumference of the head plate, and multiple locking blocks are provided along the circumference of the second plate. The locking blocks correspond one-to-one with the actuating blocks.

Images