Striking pin with protection mechanism, EPP forming equipment and EPP forming method

Abstract

The invention relates to the technical field of EPP forming equipment, in particular to a firing pin with a protection mechanism and EPP forming equipment and method.The firing pin with the protection mechanism comprises a firing pin mechanism, the firing pin mechanism is located in a movable die body and comprises an outer pin mechanism and an inner pin mechanism, the outer pin mechanism is connected to the surface of the inner pin mechanism in a sleeving mode, and the inner pin mechanism comprises a supporting sleeve rod; one end of the supporting sleeve rod is attached to the surface of the outer needle mechanism, and the other end of the supporting sleeve rod is attached to the surface of the supporting mechanism. When the EPP model is opened and demolded, the supporting sleeve rod abuts against the movable vertical plate, the movable mold body slides to make the outer ring needle and the inner rod needle go deep into the cavity, the initial contact area is large, ejection pressure is dispersed to protect the mold, the outer ring needle is pushed to stop sliding when the mold is opened, the inner rod needle is kept in the original position due to connection with the fixed vertical plate, and the contact area is reduced and pressurized; the mode of firstly dispersing and then concentrating the pressure intensity can reduce damage to a complex model, guarantee smooth ejection and improve the overall demolding effect.

Description

Technical Field

[0001] The present invention relates to the technical field of EPP molding equipment, and in particular to a striker with a protection mechanism, an EPP molding equipment and a method. Background Art

[0002] EPP (expandable polypropylene) is a foam plastic material with excellent performance, which has the advantages of light weight, good heat insulation and sound insulation. In modern industrial production, EPP is widely used in many fields such as automobile manufacturing, packaging and transportation, and building insulation. EPP molding equipment mainly realizes the extrusion molding process of EPP plastic through the mold. During the molding operation, the two mold bodies are combined for extrusion, so that the EPP material is formed into a specific shape in the mold cavity, and then the mold is opened for unloading to complete a production cycle. During the mold opening process, the sliding of the mold body at the active end will drive the striker to start. The role of the striker is to assist the molded model to fall off from the cavity to ensure the continuity and efficiency of the production process; However, the existing EPP molding mold and demoulding technology have some shortcomings: first, since a striker needs to be set in the mold cavity, the inner wall of the mold cavity will be concave. When the model is formed, the concave part will cause the model to bulge out from the original shape. In order to obtain a product that meets the requirements, the bulging part needs to be polished. However, since EPP is made of foam plastic, its texture is relatively fragile. When the bulge is polished, it is easy to cause damage to the entire model due to improper operation, thereby increasing the scrap rate of the product. On the other hand, the size of the striker used in mold molding is smaller than the size of the model. The contact area between the smaller striker and the model is limited, while the EPP material has certain elasticity and compressibility. According to the pressure principle, during the demolding process, the area where the striker head contacts the EPP product will be subjected to greater pressure. This greater pressure may cause local deformation of the surface of the EPP material, and then form indentations on the surface of the model, affecting the appearance quality and surface flatness of the product. Summary of the invention

[0003] The object of the present invention is to provide a striker with a protection mechanism, an EPP molding device and a method to solve the problems raised in the above background technology.

[0004] To achieve the above object, one of the objects of the present invention is to provide a striker with a protection mechanism, including a striker mechanism, the striker mechanism is located inside a movable mold body, the striker mechanism includes an outer needle mechanism and an inner needle mechanism, the outer needle mechanism is sleeved on the surface of the inner needle mechanism, the inner needle mechanism includes a support sleeve rod, one end of the support sleeve rod is in contact with the surface of the outer needle mechanism, and the other end of the support sleeve rod is in contact with the surface of the support mechanism; After the model is formed, the movable mold body slides to open the mold, and the support sleeve rod squeezes the outer needle mechanism under the action of the support mechanism, forcing the outer needle mechanism to slide into the cavity of the movable mold body, and pushes the model to be demolded with a large area of ​​contact. As the movable mold body continues to slide, the outer needle mechanism will slide with the movable mold body at the same time. At this time, the inner needle mechanism can extend into the interior of the cavity to pressurize the model for demolding.

[0005] As a further improvement of the present technical solution, the outer needle mechanism includes a pin hole opened inside the movable mold body, and an outer ring needle body is movably arranged at one end of the pin hole close to the cavity, the surface of the outer ring needle body is in contact with the inner wall of the pin hole, and the end of the outer ring needle body close to the cavity is flush with the inner wall of the cavity.

[0006] As a further improvement of the present technical solution, the inner needle mechanism includes a middle hole opened in the inner wall of the outer ring needle body, the inner rod needle body is movably arranged inside the middle hole, the end of the inner rod needle body close to the cavity is flush with the surface of the outer ring needle body, the outer wall of the inner rod needle body is fitted with the inner wall of the middle hole, the support sleeve rod is movably sleeved on the outer wall of the inner rod needle body, and the end of the support sleeve rod close to the cavity is fitted with the surface of the outer ring needle body.

[0007] As a further improvement of the present technical solution, the support mechanism includes a vertical plate group, the vertical plate group includes a fixed vertical plate and a movable vertical plate, the side wall of the fixed vertical plate is fixedly installed with a mounting plate, four telescopic connecting rods are fixedly installed on the surface of one end of the fixed vertical plate close to the movable vertical plate, the other ends of the four telescopic connecting rods are connected to the surface of the movable vertical plate, a plug hole is opened in the middle of the movable vertical plate, one end of the inner rod needle body away from the cavity passes through the plug hole and is threadedly connected to the surface of the fixed vertical plate, and the side of the support sleeve rod away from the outer ring needle body is attached to the surface of the movable vertical plate.

[0008] As a further improvement of the technical solution, two side protrusions are fixedly mounted on the surface of the outer ring needle body, and the inner wall of the ejector hole is provided with two side grooves that fit with the outer walls of the side protrusions.

[0009] As a further improvement of the technical solution, surfaces of the two side protrusions are fixedly connected with elastic members, and the sides of the two elastic members away from the side protrusions are respectively installed on the inner walls of the two side grooves.

[0010] As a further improvement of the technical solution, a limiting groove is provided on the inner wall of the supporting sleeve rod, and a limiting convex strip which fits the inner wall of the limiting groove is fixedly connected to the surface of the inner rod needle body.

[0011] The second object of the present invention is to provide an EPP molding device, which adopts the above-mentioned striker with a protection mechanism, including a device body, the device body including a device base, a frame plate is installed on the top of one side of the device base, a plurality of support rods are arranged inside the frame plate, and a mold body is arranged on the surface of the plurality of support rods, the mold body is composed of a movable mold body and a fixed mold body, and the mold cavity is located inside the movable mold body and the fixed mold body; A conveying member is installed on the top of one end of the equipment base away from the frame plate, the filling head of the conveying member is connected to the fixed mold body, a bending and stretching rod is installed on one end of the movable mold body away from the fixed mold body, the other end of the bending and stretching rod is connected to the piston rod end of the cylinder, the cylinder is fixedly installed inside the frame plate, and the end of the mounting plate away from the fixed vertical plate is fixedly installed on the surface of the frame plate.

[0012] The second object of the present invention is to provide a method for using a striker with a protection mechanism, comprising the following steps: S1, filling the foamed EPP beads into the cavity, forming the model and cooling it; S2. After the model is formed, the movable mold body starts to slide to open the mold. During this process, the support sleeve rod is tightly supported on the surface of the movable vertical plate to ensure that the outer ring needle body and the inner rod needle body remain in their original positions. As the movable mold body continues to slide, the outer ring needle body and the inner rod needle body will gradually extend into the cavity and push the formed model; S3. During the continuous mold opening process, the outer ring needle body is restricted by the side protrusions and stops sliding. At the same time, the outer ring needle body, the support sleeve rod and the movable vertical plate will slide toward the fixed vertical plate together with the movable mold body; S4. Since the end of the inner rod needle body is connected to the stationary fixed vertical plate, the inner rod needle body can always maintain its original position, thereby keeping it inside the cavity. As the mold opening action proceeds, the inner rod needle body applies force to the model to increase the pressure to achieve ejection; S5. When the model demolding operation is completed, the movable mold body starts to slide in the opposite direction and gradually returns to its original position. During this process, relying on the force provided by the elastic member, it can effectively assist the side protrusion to return to its initial position smoothly. The restoration of the side protrusion position will further act on the outer ring needle body, forcing it to return to its original position. Through this series of actions, the inner wall of the cavity is finally restored to a flush state.

[0013] Compared with the prior art, the present invention has the following beneficial effects: In the striker, EPP molding equipment and method with a protection mechanism, the foamed EPP beads are injected into the mold cavity of the mold body, and the mold is cooled after molding. After cooling, the mold is demolded, and the bending and stretching rod is driven by the cylinder to start, so that the movable mold body slides and the mold cavity is opened. During this process, the support sleeve rod is tightly against the surface of the movable vertical plate. With the continuous sliding of the movable mold body, the outer ring needle body and the inner rod needle body gradually penetrate into the mold cavity and exert a pushing effect on the EPP model that has been formed. Since the striker area in contact with the EPP model is relatively large at this time, the pushing pressure can be dispersed under the same ejection force, and the model is evenly and gently stressed, thereby providing preliminary protection for the ejection operation of the model and effectively reducing the risk of damage to the model due to the ejection process; During the continuous advancement of the mold opening operation, the outer ring needle body is constrained by the side protrusion and stops sliding. At this moment, the outer ring needle body, the support sleeve rod and the movable vertical plate are synchronously displaced toward the fixed vertical plate under the drive of the movable mold body. Since the end of the inner rod needle body is tightly connected to the fixed vertical plate and the fixed vertical plate is in a static state, the inner rod needle body can maintain its initial position. With the continuous progress of the mold opening action, the inner rod needle body acts on the model. Under the same pushing force, since its contact area with the model is smaller than that in the previous stage, the pressure is increased. Especially for those models with more complex shapes, this method of first dispersing and then concentrating the pressure can not only reduce the possible damage to the model, but also achieve the purpose of smoothly ejecting the model from the cavity; Moreover, during the entire model forming process, the outer ring needle body and the inner wall of the cavity are in an adapted state. Compared with the existing technology, the problem of bulge defects on the model surface can be effectively avoided while demolding and ejecting the model. In this way, the integrity of the model is further guaranteed, greatly reducing the possibility of the model needing to be processed again after forming. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a front view of the overall structure of the present invention; Figure 3 It is a schematic diagram of the mold body structure of the present invention; Figure 4 This is a schematic diagram of the mold body opening structure of the present invention; Figure 5 It is a schematic diagram of the cutaway structure of the movable model of the present invention; Figure 6 This is a side view of the structure of ejecting the model through the outer ring needle body of the present invention; Figure 7 This is a top view of the structure of the present invention in which the model is ejected through the inner rod needle body; Figure 8 It is a schematic diagram of the cutaway structure of the firing pin mechanism of the present invention; Fig. 9 For the present invention Figure 8 A schematic diagram of the structure at A; Fig.10 It is a schematic diagram of the exploded structure of the firing pin mechanism of the present invention; Fig.11 It is a schematic diagram of the structure of the vertical plate group of the present invention.

[0015] The meaning of each number in the figure is: 1. Equipment body; 11. Equipment base; 12. Frame plate; 13. Mold body; 131. Support rod; 132. Cavity; 14. Conveying part; 15. Bending and stretching rod; 16. Cylinder; 2. Strike mechanism; 21. External needle mechanism; 22. Internal needle mechanism; 211, ejector pin hole; 212, outer ring pin body; 221, middle hole; 222, inner rod needle body; 223, supporting sleeve rod; 3. Support mechanism; 31. Vertical plate group; 311. Fixed vertical plate; 312. Movable vertical plate; 313. Telescopic connecting rod; 314. Mounting plate; 315. Plug hole; 4. side protrusion; 41. side groove; 42. elastic member; 5. Limiting groove; 51. Limiting convex strip. DETAILED DESCRIPTION

[0016] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Example 1, please refer to Figure 2 , Figure 4 and Figure 5 As shown, the purpose of this embodiment is to provide a striker with a protection mechanism, including a striker mechanism 2, the striker mechanism 2 is located inside the movable mold body, the striker mechanism 2 includes an outer needle mechanism 21 and an inner needle mechanism 22, the outer needle mechanism 21 is sleeved on the surface of the inner needle mechanism 22, the inner needle mechanism 22 includes a supporting sleeve rod 223, one end of the supporting sleeve rod 223 is in contact with the surface of the outer needle mechanism 21, and the other end of the supporting sleeve rod 223 is in contact with the surface of the supporting mechanism 3.

[0018] After the model is formed, the movable mold body slides to open the mold, and the support sleeve rod 223 squeezes the outer needle mechanism 21 under the action of the support mechanism 3, forcing the outer needle mechanism 21 to slide into the cavity 132 of the movable mold body, and pushes the model to be demolded with a large area of ​​contact. As the movable mold body continues to slide, the outer needle mechanism 21 will slide with the movable mold body at the same time. At this time, the inner needle mechanism 22 can extend into the interior of the cavity 132 to pressurize the model for demolding.

[0019] When the movable mold body slides to open the mold, the cooled and formed model inside the cavity 132 will be first gently ejected with the help of the outer needle mechanism 21. The specific structure of the outer needle mechanism 21 is disclosed below. The outer needle mechanism 21 includes an ejector hole 211 opened inside the movable mold body, and an outer ring needle body 212 is movably provided at one end of the ejector hole 211 close to the cavity 132. The surface of the outer ring needle body 212 is in contact with the inner wall of the ejector hole 211, and the end of the outer ring needle body 212 close to the cavity 132 is flush with the inner wall of the cavity 132.

[0020] See also Figure 5 As shown, in the ejector hole 211 opened inside the movable mold body, the outer ring needle body 212 is movably installed therein, and the surface of the outer ring needle body 212 is in contact with the inner wall of the ejector hole 211, and the end close to the cavity 132 is in an adapted state with the inner wall of the cavity 132 (it should be noted that the figure is only for reference, and in fact the end shape of the outer ring needle body 212 can be customized according to the inner wall shape of the cavity 132). The surface of the outer ring needle body 212 and the inner wall of the cavity 132 are adapted to each other, which effectively avoids the phenomenon of a bulging section of the model during the molding process. In addition, although there is a certain gap between the surface of the outer ring needle body 212 and the inner wall of the ejector hole 211, the gap is extremely small and can be ignored in practical applications.

[0021] Among them, the outer ring needle body 212 is adapted to the inner wall of the cavity 132 to avoid protrusion of the model during molding, which effectively guarantees the regularity and integrity of the model's appearance, so that the product accurately meets the specifications and standards required by the design. In this way, there is no need to carry out additional grinding or trimming work to deal with appearance defects, which significantly reduces the risk of damage to the model due to subsequent grinding and processing operations, and effectively plays a role in protecting the model.

[0022] As a closed-cell foam plastic, EPP has excellent elasticity and cushioning properties. After it is formed, it will generate a certain amount of friction and adsorption between it and the mold. In addition, due to the elastic properties of the EPP material itself, a certain degree of deformation recovery will occur in the mold, which makes it fit the mold more closely. Especially for those models with complex shapes, it is necessary to use the inner needle mechanism 22 combined with the support mechanism 3 to apply additional force so as to more effectively eject the model from the mold. The specific structure of the support mechanism 3 is disclosed, the inner needle mechanism 22 includes a middle hole 221 opened on the inner wall of the outer ring needle body 212, and the inner rod needle body 222 is movably arranged inside the middle hole 221, and the end of the inner rod needle body 222 close to the cavity 132 is flush with the surface of the outer ring needle body 212, and the outer wall of the inner rod needle body 222 is in contact with the inner wall of the middle hole 221, and the support sleeve rod 223 is movably sleeved on the outer wall of the inner rod needle body 222, and the end of the support sleeve rod 223 close to the cavity 132 is in contact with the surface of the outer ring needle body 212.

[0023] The supporting mechanism 3 includes a vertical plate group 31, which includes a fixed vertical plate 311 and a movable vertical plate 312. A mounting plate 314 is fixedly installed on the side wall of the fixed vertical plate 311. Four telescopic connecting rods 313 are fixedly installed on the surface of one end of the fixed vertical plate 311 close to the movable vertical plate 312. The other ends of the four telescopic connecting rods 313 are connected to the surface of the movable vertical plate 312. A plug hole 315 is opened in the middle of the movable vertical plate 312. The end of the inner rod needle body 222 away from the cavity 132 passes through the plug hole 315 and is threadedly connected to the surface of the fixed vertical plate 311. The side of the support sleeve rod 223 away from the outer ring needle body 212 is attached to the surface of the movable vertical plate 312.

[0024] Two side protrusions 4 are fixedly mounted on the surface of the outer ring needle body 212 , and the inner wall of the ejector needle hole 211 is provided with two side grooves 41 which are in contact with the outer walls of the side protrusions 4 .

[0025] like Figure 8As shown, the reason why the outer ring needle body 212 can achieve that its end is flush with the inner wall of the cavity 132 is that the end away from the cavity 132 is tightly fitted with the support sleeve rod 223, and the other side of the support sleeve rod 223 is in contact with the surface of the movable vertical plate 312, and the movable vertical plate 312 is connected to the fixed vertical plate 311 by means of the telescopic connecting rod 313. With the thrust provided by the telescopic connecting rod 313, the outer ring needle body 212 can be effectively maintained flush with the inner wall of the cavity 132. At the same time, the inner rod needle body 222 and the outer ring needle body 212 are in a movably connected relationship. One end of the inner rod needle body 222 is in an adapted state with the side wall of the outer ring needle body 212 (the surface of the inner rod needle body 222 can be customized according to the shape of the outer ring needle body 212), and the other end passes through the plug hole 315 and is installed on the surface of the fixed vertical plate 311 in a threaded manner.

[0026] When the molded model enters the demoulding stage, combined with Figure 6 As shown, the movable mold body slides toward the vertical plate group 31. During the sliding mold opening process, the support sleeve rod 223 is tightly against the surface of the movable vertical plate 312, so that the outer ring needle body 212 maintains its original position without moving. During this period, the two side protrusions 4 fixedly connected to the surface of the outer ring needle body 212 can slide in the side grooves 41 opened on the inner wall of the ejector hole 211, thereby achieving the effect of the outer ring needle body 212 and the inner rod needle body 222 gradually penetrating into the cavity 132, and pushing the formed EPP model. Since the area of ​​the striker in contact with the EPP model is relatively large at this moment, the pushing pressure can be dispersed under the same ejection force, and the force on the model is uniform and relatively mild. In this way, a preliminary protection mechanism is constructed for the ejection operation of the model, which effectively reduces the risk of damage to the model due to the ejection process.

[0027] See also Figure 7 As shown, during the continuous advancement of the mold opening operation, the outer ring needle body 212 is constrained by the side protrusion 4 and stops sliding, so with the push of the movable mold body, the outer ring needle body 212, the support sleeve rod 223 and the movable vertical plate 312 will be synchronously displaced in the direction of the fixed vertical plate 311. Since the end of the inner rod needle body 222 is connected to the fixed vertical plate 311 in a stationary state, the inner rod needle body 222 can always maintain its initial position; as the mold opening action continues, the inner rod needle body 222 gradually protrudes and acts on the model. Under the same pushing force conditions, because its contact area with the model is significantly reduced compared with the previous stage, the pressure can be effectively increased. Especially for models with more complex shapes, the estimation method of first dispersing and then concentrating the pressure can not only significantly reduce the possible damage to the model, but also successfully eject the model from the cavity 132.

[0028] After the model is demolded and unloaded, the movable mold body begins to slide in the opposite direction and gradually returns to its original position. At this time, the telescopic connecting rod 313 returns to its initial state due to the disappearance of pressure, thereby driving the movable vertical plate 312 and the outer ring needle body 212 to return to their original positions together, so that subsequent model forming operations can be carried out smoothly, ensuring the cyclic continuity of the entire production process.

[0029] The telescopic connecting rod 313 is composed of two sleeve connecting rod bodies and an external spring member. The two sleeve connecting rods are also connected by the spring member. Through the double elasticity, Fig.11 As shown, during model forming, the telescopic connecting rod 313 can push the movable vertical plate 312, thereby driving the outer ring needle body 212 to maintain adaptation with the inner wall of the cavity 132, ensuring the accuracy and quality of model forming, and reducing the situation where the model defects are caused by the position deviation of the outer ring needle body 212; during the demolding process, when the movable mold body slides to open the mold, the telescopic connecting rod 313 can transmit appropriate force at different stages according to the deformation characteristics of the spring and its own structure, assist in stabilizing the outer ring needle body 212 in the early stage, and adaptively adjust when the pressure changes in the later stage, and cooperate with the inner rod needle body 222 to realize the ejection method of first dispersing and then concentrating the pressure, which effectively ensures the smooth demolding of the model and reduces damage, thereby improving the stability and reliability of the entire molding and demolding process.

[0030] Among them, a scale (not shown in the figure) can be set on the surface of the inner rod needle body 222 to detect the telescopic position of the telescopic connecting rod 313, and then determine whether the end of the outer ring needle body 212 is compatible with the inner wall of the cavity 132. Through intuitive scale readings, the operator can quickly and accurately understand the relative position relationship of key components of the mold, promptly discover and adjust possible deviations, and effectively reduce model molding defects caused by improper adaptation of the outer ring needle body 212 and the cavity 132.

[0031] Since the outer ring needle body 212 needs to slide stably on the inner wall of the ejector hole 211 during demolding and resetting, the surfaces of the two side protrusions 4 are fixedly connected with elastic members 42, and the two elastic members 42 are respectively installed on the inner walls of the two side grooves 41 away from the side protrusions 4.

[0032] The improvements are: See Fig. 9 As shown, when the mold is reset, the elastic member 42 can apply a stable and directional thrust to the side protrusion 4 by virtue of its own elastic restoring force, so as to cause the side protrusion 4 to return accurately to its position along a predetermined trajectory in the side groove 41, thereby driving the outer ring needle body 212 to return to its initial accurate position, providing a reliable mold state basis for the next model forming operation, wherein the elastic member 42 is preferably a spiral spring member, and the elastic force of the elastic member 42 is less than the telescopic elastic force of the telescopic connecting rod 313.

[0033] Since the support sleeve rod 223 needs to slide along the surface of the inner rod needle body 222 during operations such as mold opening and resetting, a limiting groove 5 is provided on the inner wall of the support sleeve rod 223, and a limiting convex strip 51 is fixedly connected to the surface of the inner rod needle body 222 and fits with the inner wall of the limiting groove 5.

[0034] The improvement is: Fig.10 As shown, when the support sleeve rod 223 slides on the surface of the inner rod needle body 222, the limiting convex strip 51 and the limiting groove 5 will engage with each other. Through this close fit and limiting effect, the movement direction of the support sleeve rod 223 can be constrained, reducing its unexpected deviation and shaking, ensuring that the support sleeve rod 223 can accurately and stably slide on the surface of the inner rod needle body 222, thereby ensuring the accuracy of the coordinated work between the various components of the mold.

[0035] On the other hand, the present invention also proposes an EPP molding device, which uses the above-mentioned striker with a protection mechanism, including a device body 1, the device body 1 includes a device base 11, a frame plate 12 is installed on the top of one side of the device base 11, a plurality of support rods 131 are arranged inside the frame plate 12, and a mold body 13 is arranged on the surface of the plurality of support rods 131, the mold body 13 is composed of a movable mold body and a fixed mold body, and the cavity 132 is located inside the movable mold body and the fixed mold body; A conveying member 14 is installed on the top of the end of the equipment base 11 away from the frame plate 12, and the filling head of the conveying member 14 is connected to the fixed mold body. A bending stretching rod 15 is installed on the end of the movable mold body away from the fixed mold body, and the other end of the bending stretching rod 15 is connected to the piston rod end of the cylinder 16. The cylinder 16 is fixedly installed inside the frame plate 12, and the mounting plate 314 is fixedly installed on the surface of the frame plate 12 at one end away from the fixed vertical plate 311.

[0036] Embodiment 2: This embodiment is based on the content provided in Embodiment 1, and aims to provide a method for using a striker with a protection mechanism. The specific steps are as follows: Step 1: Fill the foamed EPP beads into the cavity 132, form the model and cool it; Step 2: After the model is formed, the movable mold body starts to slide to open the mold. During this process, the support sleeve rod 223 is tightly supported on the surface of the movable vertical plate 312 to ensure that the outer ring needle body 212 and the inner rod needle body 222 are maintained in their original positions. As the movable mold body continues to slide, the outer ring needle body 212 and the inner rod needle body 222 will gradually extend into the mold cavity 132 and produce a pushing effect on the formed model; Step 3: During the continuous mold opening process, the outer ring needle body 212 is restricted by the side protrusion 4 and stops sliding. At the same time, the outer ring needle body 212, the support sleeve rod 223 and the movable vertical plate 312 will slide toward the fixed vertical plate 311 together with the movable mold body; Step 4: Since the end of the inner rod needle body 222 is connected to the stationary fixed vertical plate 311, the inner rod needle body 222 can always maintain its original position, thereby remaining inside the cavity 132. As the mold opening action proceeds, the inner rod needle body 222 applies force to the model to increase the pressure to achieve ejection; Step 5. When the model demolding operation is completed, the movable mold body starts to slide in the opposite direction and gradually returns to its original position. During this process, relying on the force provided by the elastic member 42, it can effectively assist the side protrusion 4 to return to its initial position smoothly. The restoration of the position of the side protrusion 4 will further act on the outer ring needle body 212, forcing it to return to its original position. Through this series of actions, the inner wall of the cavity 132 is finally restored to a flush state.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A striker with a protection mechanism, comprising a striker mechanism (2), wherein the striker mechanism (2) is located inside a movable mold body, and is characterized in that: The striker mechanism (2) comprises an outer needle mechanism (21) and an inner needle mechanism (22), the outer needle mechanism (21) being sleeved on the surface of the inner needle mechanism (22), the inner needle mechanism (22) comprising a support sleeve rod (223), one end of the support sleeve rod (223) being in contact with the surface of the outer needle mechanism (21), and the other end of the support sleeve rod (223) being in contact with the surface of the support mechanism (3); After the model is formed, the movable mold body slides to open the mold, and the support sleeve rod (223) squeezes the outer needle mechanism (21) under the action of the support mechanism (3), forcing the outer needle mechanism (21) to slide into the cavity (132) of the movable mold body, and pushes the model to be demoulded with a large area contact. As the movable mold body continues to slide, the outer needle mechanism (21) will slide with the movable mold body at the same time. At this time, the inner needle mechanism (22) can extend into the cavity (132) to pressurize the model for demoulding.

2. The firing pin with a protection mechanism according to claim 1, characterized in that: The outer needle mechanism (21) comprises an ejector hole (211) formed inside a movable mold body, an outer ring needle body (212) being movably provided at one end of the ejector hole (211) close to the mold cavity (132), a surface of the outer ring needle body (212) being in contact with the inner wall of the ejector hole (211), and an end of the outer ring needle body (212) close to the mold cavity (132) being flush with the inner wall of the mold cavity (132).

3. The firing pin with a protection mechanism according to claim 2, characterized in that: The inner needle mechanism (22) comprises a middle hole (221) formed on the inner wall of the outer ring needle body (212); an inner rod needle body (222) is movably arranged inside the middle hole (221); one end of the inner rod needle body (222) close to the cavity (132) is flush with the surface of the outer ring needle body (212); the outer wall of the inner rod needle body (222) is in contact with the inner wall of the middle hole (221); the support sleeve rod (223) is movably sleeved on the outer wall of the inner rod needle body (222); one end of the support sleeve rod (223) close to the cavity (132) is in contact with the surface of the outer ring needle body (212).

4. The firing pin with a protection mechanism according to claim 3, characterized in that: The support mechanism (3) comprises a vertical plate group (31), wherein the vertical plate group (31) comprises a fixed vertical plate (311) and a movable vertical plate (312), a mounting plate (314) being fixedly mounted on the side wall of the fixed vertical plate (311), four telescopic connecting rods (313) being fixedly mounted on the surface of one end of the fixed vertical plate (311) close to the movable vertical plate (312), the other ends of the four telescopic connecting rods (313) being connected to the surface of the movable vertical plate (312), a plug hole (315) being provided in the middle of the movable vertical plate (312), an end of the inner rod needle body (222) away from the mold cavity (132) passing through the plug hole (315) and being threadedly connected to the surface of the fixed vertical plate (311), and a side of the support sleeve rod (223) away from the outer ring needle body (212) being attached to the surface of the movable vertical plate (312).

5. The firing pin with a protection mechanism according to claim 4, characterized in that: Two side protrusions (4) are fixedly mounted on the surface of the outer ring needle body (212), and the inner wall of the ejector needle hole (211) is provided with two side grooves (41) that fit with the outer walls of the side protrusions (4).

6. The firing pin with a protection mechanism according to claim 5, characterized in that: The surfaces of the two side protrusions (4) are both fixedly connected with elastic members (42), and the sides of the two elastic members (42) away from the side protrusions (4) are respectively mounted on the inner walls of the two side grooves (41).

7. The firing pin with a protection mechanism according to claim 3, characterized in that: The inner wall of the support sleeve rod (223) is provided with a limiting groove (5), and the surface of the inner rod needle body (222) is fixedly connected with a limiting convex strip (51) that fits the inner wall of the limiting groove (5).

8. An EPP molding device, using the striker with a protection mechanism as claimed in any one of claims 4 to 7, comprising a device body (1), characterized in that: The device body (1) comprises a device base (11), a frame plate (12) is installed on the top of one side of the device base (11), a plurality of support rods (131) are arranged inside the frame plate (12), a mold body (13) is arranged on the surface of the plurality of support rods (131), the mold body (13) is composed of a movable mold body and a fixed mold body, and the mold cavity (132) is located inside the movable mold body and the fixed mold body; A conveying member (14) is installed at the top of one end of the equipment base (11) away from the frame plate (12); a filling head of the conveying member (14) is connected to a fixed mold body; a bending stretching rod (15) is installed at one end of the movable mold body away from the fixed mold body; the other end of the bending stretching rod (15) is connected to the piston rod end of a cylinder (16); the cylinder (16) is fixedly installed inside the frame plate (12); and one end of the mounting plate (314) away from the fixed vertical plate (311) is fixedly installed on the surface of the frame plate (12).

9. A method for operating the firing pin with a protection mechanism according to claim 6, characterized in that: The method comprises the following steps: S1, filling the foamed EPP beads into the cavity (132), forming the model and cooling it; S2. After the model is formed, the movable mold body starts to slide to open the mold. During this process, the support sleeve rod (223) is tightly supported on the surface of the movable vertical plate (312) to ensure that the outer ring needle body (212) and the inner rod needle body (222) are maintained in their original positions. As the movable mold body continues to slide, the outer ring needle body (212) and the inner rod needle body (222) gradually extend into the mold cavity (132) and exert a pushing effect on the formed model. S3, during the continuous mold opening process, the outer ring needle body (212) is restricted by the side protrusion (4) and stops sliding. At the same time, the outer ring needle body (212), the support sleeve rod (223) and the movable vertical plate (312) will slide together with the movable mold body toward the direction of the fixed vertical plate (311); S4. Since the end of the inner rod needle body (222) is connected to the stationary fixed vertical plate (311), the inner rod needle body (222) can always maintain its original position, thereby being retained inside the mold cavity (132). As the mold opening action proceeds, the inner rod needle body (222) applies a force to the model to increase the pressure to achieve ejection; S5. When the demoulding operation of the model is completed, the movable mold body starts to slide in the opposite direction and gradually returns to its original position. During this process, relying on the force provided by the elastic member (42), it can effectively assist the side protrusion (4) to smoothly return to its initial position. The restoration of the position of the side protrusion (4) will further act on the outer ring needle body (212), forcing it to return to its original position. Through this series of actions, the inner wall of the cavity (132) is finally restored to a flush state.

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