Slider mechanism with pre-ejection

Abstract

The utility model discloses a slider mechanism with pre-demoulding, include: fixed frame is solid with mould base and is equipped with slide rail, the mould oil cylinder is set up on the fixed frame, and the telescopic direction is parallel to the slide rail, the slider is set up on the slide rail of fixed frame and is connected with the mould oil cylinder, and along with the telescopic of mould oil cylinder, is limited to slide on the fixed frame along the slide rail, the mould block is set up on the slider, and is equipped with the mould surface on the outside surface, the roof is set up on the slider, a plurality of thimbles, the tail end is set up on the roof, and the head end passes through the slider, the mould block is located on the mould surface of mould block, the needle plate control mechanism is set up on the fixed frame, and the control roof is displaced with the slider displacement and is displaced, when the slider moulds, and the gap is left between the control roof and the slider, and the control roof is returned with the slider synchronous return after the slider is returned to certain displacement amount. The utility model can be positioned to the die casting finished product when demoulding, and finally along with the slider and the die casting product separation, guarantees the smooth moulding of die casting product.

Description

Technical Field

[0001] This utility model relates to the field of mold manufacturing, specifically to a slider mechanism with pre-demolding. Background Technology

[0002] The parting surface of a die-casting mold is determined based on the designed die-casting product. Some die-casting products have numerous grooves and protrusions on their surfaces, forming a concave-convex surface, especially when the grooves are deep. When the parting module (with a parting surface that matches the surface of the die-casting product) closes, the concave-convex surface of the die-casting product is in close contact with the parting module. Therefore, a significant suction force is generated on the die-casting product during the mold closing process. This causes the die-casting product to be dragged by the parting module and subjected to force or to move along with it, and even after the parting module is reset, the die-casting product remains in an adherent state to the parting module.

[0003] Some die-cast products cannot be fixed in the mold core during the mold closing process due to their product structure characteristics or mold design. If the die-cast product moves as the mold closing module retracts and the mold closes, the die-cast product will move, and the amount of movement is uncertain. This makes it difficult to remove the product (for fixed-point movement by a robotic arm). Furthermore, the movement may scrape other mold closing modules or mold cores, leading to a reduction in mold life or damage. Utility Model Content

[0004] In view of the above-mentioned defects of the prior art, the purpose of this utility model is to provide a slider mechanism with pre-demolding, which limits the demolding of the die-cast product and ensures the smooth mold closing of the die-cast product as the slider separates from the die-cast product.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A slider mechanism with pre-demolding capability, including:

[0007] The fixed frame is fixedly connected to the mold base and is equipped with a slide rail;

[0008] The mold closing cylinder is mounted on a fixed frame, and its extension and retraction direction is parallel to the slide rail.

[0009] The slider is set on the slide rail of the fixed frame and connected to the mold closing cylinder. As the mold closing cylinder extends and retracts, it slides along the slide rail on the fixed frame to a limited position.

[0010] The mold assembly module is mounted on the slider, and a mold engagement surface is provided on its outer side.

[0011] The top plate, with its sliding mechanism mounted on the slider;

[0012] Several ejector pins, with their tail ends set on the top plate and their head ends passing through the slider, are located on the mold closing surface of the mold closing module;

[0013] The needle plate control mechanism is set on the fixed frame and controls the top plate to move with the slider. When the slider closes the mold, the control mechanism leaves a gap between the top plate and the slider. When the slider retracts to a certain displacement, the control mechanism controls the top plate to retract synchronously with the slider.

[0014] Furthermore, the fixing frame includes:

[0015] The base plate has a mold closing cylinder installed on its outer side.

[0016] Two side plates are respectively spaced at both ends of the base plate, forming a U-shaped structure with the base plate; the inner side of the side plates is provided with a stepped surface, and the stepped surfaces of the two side plates form a limiting slide rail; the slider makes limiting contact with the bottom and side surfaces of the stepped surface; the telescopic end of the mold closing cylinder passes through the base plate and connects to the slider located on the slide rail.

[0017] Furthermore, the needle plate control mechanism includes two control units, respectively disposed on both sides of the slider, corresponding to both sides of the top plate; the control units include:

[0018] The connecting rod is shaped like a "7" and its straight end is fixed to the outer side of the slider; the top plate has a notch or groove on its side that matches the connecting rod so that the connecting rod can pass through.

[0019] A mold closing limit block is installed on a fixed frame. When the slider closes the mold, the bent end of the connecting rod drives the top plate to move. After the slider closes the mold, the top plate is limited and fixed by the mold closing limit block and the bent end of the connecting rod.

[0020] The ejector assembly is mounted on the fixed frame, directly opposite the connecting rod. When the slider closes the mold, the ejector assembly limits the retraction of the ejector plate. When the slider retracts, the ejector assembly retracts with the connecting rod to a certain distance, and then releases the retraction limit on the ejector rod.

[0021] Furthermore, the lower surface of the mold closing limiting block is in close contact with the upper surface of the connecting rod, thereby limiting the sliding movement of the connecting rod.

[0022] Furthermore, the top protrusion assembly includes a top protrusion block, which is elastically and telescopically mounted on the fixed frame, and its telescopic direction is perpendicular to the displacement direction of the top plate; the top protrusion block is provided with a top protrusion surface, the top protrusion surface is provided with an inclined retraction surface, and the normal of the retraction surface points to the outer side surface of the top plate; the outer side surface of the bent end of the connecting rod is provided with a pushing surface that matches the retraction surface.

[0023] When the slider closes the mold, the side of the top protrusion contacts the outer side of the top plate, limiting the retraction of the top plate; when the slider retracts, the top protrusion retracts in the direction of its elastic extension and contraction due to the pressure of the pushing surface, the top protrusion separates from the top plate, and the retraction limit on the ejector pin is released.

[0024] Furthermore, the top protrusion has a sliding groove on the side facing the top plate; the sliding groove limits the sliding of the connecting rod; and the bottom of the sliding groove has a retraction surface.

[0025] Furthermore, the top protrusion assembly also includes:

[0026] Two sliding limit plates are set parallel to each other on the fixed frame; the opposite surfaces of the sliding limit plates are provided with limit grooves; the top protrusion is set inside the two sliding limit plates, and a limit protrusion matching the limit groove is provided at the position directly opposite to the limit groove.

[0027] The tail plate is located on the outside of the top protrusion and is fixedly connected to the fixing frame;

[0028] The return spring has one end abutting against the top protrusion and the other end abutting against the tail plate, and slides to return the top protrusion to its original position.

[0029] Furthermore, it also includes several pre-ejection units, with the tail end set inside the slider and the head end passing through the slider and the mold closing module, located on the mold closing surface; when the slider retracts and demolds, the pre-ejection units extend synchronously to limit the die-cast product.

[0030] Furthermore, the pre-top unit includes:

[0031] The pre-jacking cylinder is located inside the slider;

[0032] The pre-ejection sleeve is fixed and connected to the pre-ejection cylinder at its tail end, and its head end passes through the slider and the mold assembly module and is flush with the mold assembly surface.

[0033] The pre-jacking rod is set inside the pre-jacking sleeve, and its head slides inside the pre-jacking sleeve under the control of the pre-jacking cylinder.

[0034] Furthermore, the tip of the ejector pin has a convex outer contour;

[0035] The top plate includes:

[0036] The inner plate has stepped holes for receiving the head of the ejector pin;

[0037] The outer plate is fixed to the inner plate, the stepped holes of the inner plate are sealed, and the ejector pins are fixed to the inner plate. When the slider closes the mold, the gap between the inner plate and the slider is controlled. When the slider retracts to a certain displacement, the ejector plate is controlled to retract synchronously with the slider.

[0038] Due to the adoption of the above technical solution, this utility model has the following advantages:

[0039] The top plate connects to and controls multiple ejector pins, effectively holding the die-cast product stably within the mold core at the start of demolding, preventing it from moving synchronously with the mold core during retraction. The ejector plate control mechanism controls the top plate to retract synchronously with the slide block after it has retracted to a certain displacement. This allows the ejector pins to completely move away from the mold core as the slide block retracts, separating the die-cast product from the ejector pins. Simultaneously, the ejector pins are completely detached from the mold core, providing a foundation for the next die-casting cycle. If a release agent is sprayed onto the mold core surface, the ejector pins must be kept away to prevent the release agent from being applied to them.

[0040] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description

[0041] The accompanying drawings of this utility model are described below:

[0042] Figure 1 This is a schematic diagram of the first three-dimensional structure of the slider mechanism with pre-demolding in this embodiment.

[0043] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle.

[0044] Figure 3 for Figure 1 Enlarged structural diagram at point B.

[0045] Figure 4 This is a schematic diagram of the second three-dimensional structure of the slider mechanism with pre-demolding in this embodiment.

[0046] Figure 5 for Figure 4 Enlarged structural diagram at point C.

[0047] Figure 6 This is a top view of the slider mechanism with pre-demolding in this embodiment.

[0048] Figure 7 for Figure 6 Enlarged structural diagram at point D.

[0049] Figure 8 This is a front view schematic diagram of the slider mechanism with pre-demolding in this embodiment.

[0050] Figure 9 for Figure 8 Schematic diagram of the EE section structure.

[0051] Figure 10 for Figure 9 Enlarged structural diagram at point F.

[0052] Figure 11 for Figure 9 Enlarged structural diagram at point G in the middle.

[0053] Figure 12 This is a cross-sectional view of the pre-top unit in this embodiment.

[0054] In the diagram: 1. Fixing frame; 11. Base plate; 12. Side plate; 121. Stepped surface; 2. Mold closing cylinder; 3. Slider; 4. Mold closing module; 41. Mold closing surface; 5. Top plate; 51. Notch groove; 52. Inner plate; 521. Stepped hole; 53. Outer plate; 6. Ejector pin; 71. Connecting rod; 711. Pushing surface; 72. Mold closing limit block; 731. Top protrusion; 7311. Retraction surface; 7312. Slide groove; 7313. Limiting protrusion; 732. Sliding limit plate; 7321. Limiting groove; 733. Tail plate; 734. Return spring; 81. Pre-ejection cylinder; 82. Pre-ejection sleeve; 83. Pre-ejection rod. Detailed Implementation

[0055] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example

[0056] like Figures 1 to 11 As shown, the slider 3 mechanism with pre-clamping includes:

[0057] Fixed frame 1 is fixedly connected to the mold base and is equipped with a slide rail;

[0058] The mold closing cylinder 2 is mounted on the fixed frame 1, and its extension and retraction direction is parallel to the slide rail;

[0059] The slider 3 is set on the slide rail of the fixed frame 1 and connected to the mold closing cylinder 2. As the mold closing cylinder 2 extends and retracts, it slides along the slide rail on the fixed frame 1.

[0060] The mold assembly module 4 is mounted on the slider 3, and a mold assembly surface 41 is provided on its outer side.

[0061] Top plate 5, sliding mechanism on slider 3;

[0062] Several ejector pins 6 have their tail ends set on the top plate 5 and their head ends pass through the slider 3 and the assembly module 4 is located on the assembly surface 41 of the assembly module 4.

[0063] The needle plate control mechanism is set on the fixed frame 1 and controls the top plate 5 to move with the slider 3. When the slider 3 closes the mold, the control mechanism leaves a gap between the top plate 5 and the slider 3. When the slider 3 retracts to a certain displacement, the control mechanism controls the top plate 5 to retract synchronously with the slider 3.

[0064] The top plate 5 connects to and controls multiple ejector pins 6, effectively holding the die-cast product stably within the mold core at the start of demolding, preventing it from moving synchronously with the mold core 4 during retraction. The ejector plate control mechanism controls the top plate 5 to retract synchronously with the slider 3 after the slider 3 has retracted to a certain displacement. This allows the ejector pins 6 to completely move away from the mold core as the slider 3 retracts, separating the die-cast product from the ejector pins 6. Simultaneously, the ejector pins 6 completely detach from the mold core, providing a foundation for the next die-casting operation. For example, if a release agent is sprayed onto the mold core surface, the ejector pins 6 need to be moved away to prevent the release agent from being sprayed onto them.

[0065] In this embodiment, the fixing frame 1 includes:

[0066] Base plate 11, with mold closing cylinder 2 installed on the outer side;

[0067] Two side plates 12 are respectively spaced at both ends of the base plate 11, forming a U-shaped structure with the base plate 11; the inner side of the side plate 12 is provided with a stepped surface 121, and the stepped surfaces 121 of the two side plates 12 form a limiting slide rail; the slider 3 makes limiting contact with the bottom and side surfaces of the stepped surface 121; the telescopic end of the mold closing cylinder 2 passes through the base plate 11 and is connected to the slider 3 located on the slide rail.

[0068] In this embodiment, the needle plate control mechanism includes two control units, respectively disposed on both sides of the slider 3, corresponding to both sides of the top plate 5; the control units include:

[0069] The connecting rod 71 is shaped like the number 7, and its straight end is fixed to the outer side of the slider 3; the top plate 5 has a notch 51 on its side that matches the connecting rod 71 and allows the connecting rod 71 to pass through;

[0070] The mold closing limit block 72 is set on the fixed frame 1. When the slider 3 closes the mold, the bent end of the connecting rod 71 drives the top plate 5 to move. After the slider 3 closes the mold, the top plate 5 is limited and fixed by the mold closing limit block 72 and the bent end of the connecting rod 71.

[0071] The ejector assembly is mounted on the fixed frame 1, directly opposite the connecting rod 71. When the slider 3 closes the mold, the ejector assembly limits the retraction of the ejector plate 5. When the slider 3 retracts, the ejector assembly retracts with the connecting rod 71 to a certain distance, and then releases the retraction limit on the ejector rod.

[0072] The connecting rod 71 is integrated with the slider 3 and can move with the slider 3, thereby limiting the top plate 5 and controlling the sliding of the top protrusion assembly.

[0073] In this example, the lower surface of the mold closing limit block 72 is in close contact with the upper surface of the connecting rod 71, thereby limiting the sliding of the connecting rod 71.

[0074] The mold closing limit block 72 can limit the vertical displacement of the connecting rod 71, thereby increasing the stability of the connecting rod 71 during movement.

[0075] In this embodiment, the top protrusion assembly includes a top protrusion 731, which is elastically and telescopically mounted on the fixed frame 1, and its telescopic direction is perpendicular to the displacement direction of the top plate 5; the top protrusion 731 is provided with a top protrusion surface, the top protrusion surface is provided with an inclined retraction surface 7311, and the normal of the retraction surface 7311 points to the outer side of the top plate 5; the outer side of the bent end of the connecting rod 71 is provided with a pushing surface 711 that matches the retraction surface 7311;

[0076] When the slider 3 closes the mold, the side of the top protrusion 731 contacts the outer side of the top plate 5, limiting the retraction of the top plate 5; when the slider 3 retracts, the top protrusion 731 retracts in the direction of its elastic extension and retraction due to the pressure of the pushing surface 711, and the top protrusion 731 separates from the top plate 5, releasing the retraction limit on the ejector pin.

[0077] In this embodiment, the top protrusion 731 has a sliding groove 7312 on the side facing the top plate 5; the sliding groove 7312 limits the sliding of the connecting rod 71; and the bottom of the sliding groove 7312 has a retraction surface 7311.

[0078] The groove 7312 can limit the end displacement of the connecting rod 71, ensuring that the pushing surface 711 of the connecting rod 71 and the retraction surface 7311 of the top protrusion 731 can properly abut against each other.

[0079] In this embodiment, the convex component further includes:

[0080] Two sliding limit plates 732 are arranged parallel to each other on the fixed frame 1; the opposite surfaces of the sliding limit plates 732 are provided with limit grooves 7321; the top protrusion 731 is arranged inside the two sliding limit plates 732, and a limit protrusion 7313 matching the limit groove 7321 is provided at the position directly opposite to the limit groove 7321.

[0081] Tail plate 733 is located on the outside of top protrusion 731 and is fixedly connected to fixing frame 1;

[0082] The return spring 734 has one end abutting against the top protrusion 731 and the other end abutting against the tail plate 733, and slides to return the top protrusion 731 to its original position.

[0083] The return spring 734 allows the top protrusion 731 to automatically limit the top plate 5 after mold closing, so that the limit on the top plate 5 will not be released when the slider 3 starts to retract.

[0084] In this embodiment, several pre-ejection units are also included. The tail end is set inside the slider 3, and the head end passes through the slider 3 and the mold assembly module 4 and is located on the mold assembly surface 41. When the slider 3 retracts and demolds, the pre-ejection units extend synchronously to limit the die-cast product.

[0085] Because the mold parting surface 41 has many grooves and is quite deep, the adhesion between the mold parting module 4 and the die casting is relatively large. If the ejector pin 6 is used to provide the initial force to separate the die casting product from the mold parting module 4, the ejector pin 6 will have high strength requirements. Also, because the ejector pin 6 is relatively long, it is easy for the ejector pin 6 to bend under stress. Therefore, a pre-ejection unit is set up to bear most of the force for the initial separation of the die casting product from the mold parting module 4, thereby reducing the force on the ejector pin 6.

[0086] In this embodiment, as Figure 12 As shown, the pre-top unit includes:

[0087] Pre-jacking cylinder 81 is installed inside slider 3;

[0088] The pre-ejection sleeve 82 is fixed and connected to the pre-ejection cylinder 81 at its tail end, and its head end passes through the slider 3 and the mold assembly module 4 and is flush with the mold assembly surface 41.

[0089] The pre-jacking rod 83 is set inside the pre-jacking sleeve 82, and its head end slides inside the pre-jacking sleeve 82 under the control of the pre-jacking cylinder 81.

[0090] In this embodiment, the tip of the ejector pin 6 has a convex shape on its outer contour;

[0091] The top plate 5 includes:

[0092] The inner plate 52 is provided with a stepped hole 521 for receiving the head of the ejector pin 6;

[0093] The outer plate 53 is fixedly connected to the inner plate 52, and the stepped hole 521 of the inner plate 52 is blocked. The ejector pin 6 is fixed on the inner plate 52. When the slider 3 closes the mold, the gap between the inner plate 52 and the slider 3 is controlled. When the slider 3 retracts to a certain displacement, the ejector plate 5 is controlled to retract synchronously with the slider 3.

[0094] In this embodiment, the slider 3 mechanism with pre-molding works as follows: When the mold is closed, the mold closing cylinder 2 is extended, which drives the slider 3 to slide along the stepped surface 121 toward the mold core. At this time, the connecting rod 71 connected to the slider 3 moves synchronously during mold closing. The bent end of the connecting rod 71 hooks onto the top plate 5 and drives the top plate 5 to move synchronously until the top plate 5 contacts and is limited by the mold closing limit block 72. At the same time, with the cooperation of the pushing surface 711 of the connecting rod 71 and the retraction surface 7311 of the top protrusion 731, the top protrusion 731 contacts the outer side of the top plate 5. At this time, the top protrusion 731 also limits the top plate 5.

[0095] Before die casting, the pre-ejector cylinder 81 is retracted so that the head end of the pre-ejector rod 83 is flush with the head end of the pre-ejector sleeve 82, forming the mold closing surface 41.

[0096] After die casting is completed, the mold closing cylinder 2 is retracted, and at the same time, the pre-ejector cylinder 81 is extended, so that the amount of retraction of the pre-ejector sleeve 82 along with the slider 3 is equal to the amount of extension of the pre-ejector rod. That is, the relative position of the head end of the pre-ejector rod 83 with the mold core remains unchanged, meaning that the pre-ejector rod 83 holds the die-cast product in place, preventing it from moving with the mold closing cylinder 4. At the same time, due to the restriction of the top plate 5 by the top protrusion 731, the ejector pin 6, which is fixedly connected to the top plate 5, also remains stationary relative to the mold core.

[0097] As the slider 3 continues to retract, until the pre-ejector cylinder 81 reaches its maximum extension, the pre-ejector rod 83 can no longer remain stationary relative to the mold core and can only retract with the slider 3. However, at this time, a gap has been formed between the die-cast product and the assembly module 4, and the adhesion between the die-cast product and the assembly module 4 has been greatly reduced. At this time, the ejector pin 6 can support it.

[0098] As slider 3 continues to retract until connecting rod 71 pushes top protrusion 731 back a certain distance, the interference between top protrusion 731 and top plate 5 disappears, meaning top protrusion 731 stops limiting top plate 5, and top plate 5 is no longer limited. When slider 3 continues to retract and contacts top plate 5, it drives top plate 5 to retract synchronously, causing ejector pin 6 to move away from the mold core, thus completing demolding.

[0099] 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 it. 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 spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A slider mechanism with pre-demolding, characterized in that, include: The fixed frame is fixedly connected to the mold base and is equipped with a slide rail; The mold closing cylinder is mounted on a fixed frame, and its extension and retraction direction is parallel to the slide rail. The slider is set on the slide rail of the fixed frame and connected to the mold closing cylinder. As the mold closing cylinder extends and retracts, it slides along the slide rail on the fixed frame to a limited position. The mold assembly module is mounted on the slider, and a mold engagement surface is provided on its outer side. The top plate has a sliding mechanism on the slider. Several ejector pins, with their tail ends set on the top plate and their head ends passing through the slider, are located on the mold closing surface of the mold closing module; The needle plate control mechanism is set on the fixed frame and controls the top plate to move with the slider. When the slider closes the mold, the control mechanism leaves a gap between the top plate and the slider. When the slider retracts to a certain displacement, the control mechanism controls the top plate to retract synchronously with the slider.

2. The slider mechanism with pre-demolding according to claim 1, characterized in that, The fixing frame includes: The base plate has a mold closing cylinder installed on its outer side. Two side plates are respectively spaced at both ends of the base plate, forming a U-shaped structure with the base plate; the inner side of the side plates is provided with a stepped surface, and the stepped surfaces of the two side plates form a limiting slide rail; the slider makes limiting contact with the bottom and side surfaces of the stepped surface; the telescopic end of the mold closing cylinder passes through the base plate and connects to the slider located on the slide rail.

3. The slider mechanism with pre-demolding according to claim 1, characterized in that, The needle plate control mechanism includes two control units, respectively located on both sides of the slider, corresponding to both sides of the top plate; each control unit includes: The connecting rod is shaped like a "7" and its straight end is fixed to the outer side of the slider; the top plate has a notch or groove on its side that matches the connecting rod so that the connecting rod can pass through. A mold closing limit block is installed on a fixed frame. When the slider closes the mold, the bent end of the connecting rod drives the top plate to move. After the slider closes the mold, the top plate is limited and fixed by the mold closing limit block and the bent end of the connecting rod. The ejector assembly is mounted on the fixed frame, directly opposite the connecting rod. When the slider closes the mold, the ejector assembly limits the retraction of the ejector plate. When the slider retracts, the ejector assembly retracts with the connecting rod to a certain distance, and then releases the retraction limit on the ejector rod.

4. The slider mechanism with pre-demolding according to claim 3, characterized in that, The lower surface of the mold closing limit block is in close contact with the upper surface of the connecting rod, thereby limiting the sliding movement of the connecting rod.

5. The slider mechanism with pre-demolding according to claim 3, characterized in that, The top protrusion assembly includes a top protrusion block, which is elastically and telescopically mounted on a fixed frame, and its telescopic direction is perpendicular to the displacement direction of the top plate; the top protrusion block is provided with a top protrusion surface, the top protrusion surface is provided with an inclined retraction surface, and the normal of the retraction surface points to the outer side surface of the top plate; the outer side surface of the bent end of the connecting rod is provided with a pushing surface that matches the retraction surface. When the slider closes the mold, the side of the top protrusion contacts the outer side of the top plate, limiting the retraction of the top plate; when the slider retracts, the top protrusion retracts in the direction of its elastic extension and contraction due to the pressure of the pushing surface, the top protrusion separates from the top plate, and the retraction limit on the ejector pin is released.

6. The slider mechanism with pre-demolding according to claim 5, characterized in that, The top protrusion has a sliding groove on the side facing the top plate; the sliding groove limits the sliding of the connecting rod; the bottom of the sliding groove has a retraction surface.

7. The slider mechanism with pre-demolding according to claim 5, characterized in that, The top protrusion assembly also includes: Two sliding limit plates are set parallel to each other on the fixed frame; the opposite surfaces of the sliding limit plates are provided with limit grooves; the top protrusion is set inside the two sliding limit plates, and a limit protrusion matching the limit groove is provided at the position directly opposite to the limit groove. The tail plate is located on the outside of the top protrusion and is fixedly connected to the fixing frame; The return spring has one end abutting against the top protrusion and the other end abutting against the tail plate, and slides to return the top protrusion to its original position.

8. The slider mechanism with pre-demolding according to claim 4, characterized in that, It also includes several pre-ejection units, with the tail end set inside the slider and the head end passing through the slider and the mold closing module, located on the mold closing surface; when the slider retracts and demolds, the pre-ejection units extend synchronously to limit the die-cast product.

9. The slider mechanism with pre-demolding according to claim 8, characterized in that, The pre-top unit includes: The pre-jacking cylinder is located inside the slider; The pre-ejection sleeve is fixed and connected to the pre-ejection cylinder at its tail end, and its head end passes through the slider and the mold assembly module and is flush with the mold assembly surface. The pre-jacking rod is set inside the pre-jacking sleeve, and its head slides inside the pre-jacking sleeve under the control of the pre-jacking cylinder.

10. The slider mechanism with pre-demolding according to claim 1, characterized in that, The tip of the ejector pin has a convex shape on its outer contour. The top plate includes: The inner plate has stepped holes for receiving the head of the ejector pin; The outer plate is fixed to the inner plate, the stepped holes of the inner plate are sealed, and the ejector pins are fixed to the inner plate. When the slider closes the mold, the gap between the inner plate and the slider is controlled. When the slider retracts to a certain displacement, the ejector plate is controlled to retract synchronously with the slider.

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