Ejection mechanism with stroke limiting function and injection mold

Abstract

The utility model discloses an ejection mechanism with stroke limit and an injection mold, the ejection mechanism comprises a movable mold and an ejection assembly arranged on the movable mold, the ejection assembly comprises an ejection block, an ejection rod and an elastically telescopic insert pin, the ejection block and the ejection rod are respectively assembled on the movable mold in a lifting manner, and the ejection rod is arranged on the movable mold. The insert pin is movably arranged on an ejector plate of the movable mold, the end, deviating from the ejector block, of the ejector rod is movably inserted into the ejector plate and connected to the end, facing the ejector rod, of the insert pin, and the other end of the insert pin is used for abutting against a bottom plate of the movable mold only during mold closing; the limiting unit is arranged between the movable mold plate and the movable mold core of the movable mold, and the limiting unit is used for limiting the ejection distance of the ejection rod during ejection, so that the ejection stroke of the ejection block can be effectively limited on the premise that the structure is simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection mold technical field, especially a kind of ejection mechanism and injection mold with stroke limit. BACKGROUND

[0002] The ejection mechanism of injection mold generally includes top block, ejector pin, insert plate, positioning pin and limiting screw, to realize the injection part is ejected while limiting the ejection stroke, therefore, the parts of traditional ejection mechanism are more and cause its structure to be more complex, and the assembly process of each part is more, and the processing cost is high, thereby greatly affect the cost of whole mold and preparation time before production. SUMMARY

[0003] Therefore, the utility model provides a kind of ejection mechanism and injection mold with stroke limit to solve the above problems, can effectively limit the ejection stroke of top block under the premise of structure simplification.

[0004] To achieve the above object, the technical scheme provided by the utility model is as follows:

[0005] The utility model provides a kind of ejection mechanism with stroke limit, including movable mould, still including the ejection assembly of being set on the movable mould;The ejection assembly includes top block, ejector rod and the insert needle of elastic telescopic;The top block and the ejector rod are respectively liftable and assembled in the movable mould, and one end of the top block towards the cavity surface of the movable mould is used to eject injection part, and the other end is connected with the ejector rod;The insert needle is movably arranged in the ejector pin plate of the movable mould;The end of the ejector rod away from the top block is movably inserted into the ejector pin plate and is connected to the end of the insert needle towards the ejector rod;The other end of the insert needle is used to abut against the bottom plate of the movable mould only when the mould is closed;Limiting unit is arranged between the movable mould plate and the movable mould kernel of the movable mould, and when ejecting, the limiting unit is used to limit the ejecting distance of the ejector rod, to form limiting setting to the ejection stroke of the top block.

[0006] Further, the side of the movable mould plate towards the movable mould kernel is provided with the concave stroke slot, the movable mould kernel is provided with the guide groove for matching the top block ejection;The top block is movably assembled in the guide groove, and the end of the top block towards the ejector rod is movably inserted into the stroke slot and is connected to the ejector rod;The outer circumferential surface of the ejector rod has the limiting step extending radially and protruding, the limiting step movably passes through the stroke slot, the slot opening of the guide groove towards the ejector rod is provided with the abutment groove wall for abutting against the limiting step, and when ejecting, the limiting step abuts against the abutment groove wall to limit the ejection stroke of the top block;The limiting step and the abutment groove wall jointly constitute the limiting unit.

[0007] Further, the ejector rod is detachably buckled to the ejector block.

[0008] Further, the ejector pin plate is internally provided with a mounting groove for accommodating the insert pin, the insert pin is movably assembled in the mounting groove, and an end of the insert pin away from the ejector rod movably penetrates a groove wall away from the ejector rod; when the mold is closed, the end of the insert pin protruding from the side of the ejector pin plate away from the movable mold plate abuts against the bottom plate.

[0009] Further, an elastic member is arranged between the insert pin and the inner groove wall of the mounting groove, so that the insert pin is elastically and telescopically arranged; when the insert pin is ejected, the end of the insert pin exposed to the ejector pin plate is suspended.

[0010] Further, the elastic member is a spring; the insert pin has a head portion and a rod portion connected to each other, the spring is movably sleeved on the rod portion; one end of the spring is connected to the head portion, and the other end is connected to the inner groove wall of the mounting groove; an end of the rod portion away from the head portion movably penetrates a groove wall of the mounting groove close to the bottom plate.

[0011] The utility model provides a kind of injection mold, at least comprising the ejector mechanism with stroke limit described above.

[0012] Through the technical scheme provided by the utility model, the following beneficial effects are achieved:

[0013] When ejecting, the ejector pin plate drives the insert pin to rise, the insert pin drives the ejector rod to rise, and then the ejector rod drives the ejector block to protrude from the cavity surface of the movable mold, i.e. the injection part is ejected once, and the limiting unit is used to limit the ejection distance of the ejector rod, thereby limiting the ejection stroke of the ejector block, i.e. ensuring that the ejector block remains stationary after the preset ejection stroke, and the structure of the utility model is simple, and the ejection stroke of the ejector block is effectively limited under the premise of structural simplification. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 Fig. 1 shows a cross-sectional view of the ejector mechanism with stroke limit in the mold closing stage of embodiment one;

[0015] Figure 2 Fig. 2 shows a cross-sectional view of the ejector mechanism with stroke limit in the injection part ejection stage of embodiment one;

[0016] Figure 3 Fig. 3 shows a schematic view of the ejector assembly with elastic member in embodiment one. DETAILED DESCRIPTION

[0017] To further illustrate the embodiments, the utility model provides has the drawing. These drawings are part of the utility model disclosure, which is mainly used to illustrate the embodiments, and can be combined with the related description of the specification to explain the operation principle of the embodiments. With reference to these contents, those skilled in the art should understand other possible implementation modes and the advantages of the utility model. The components in the drawing are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0018] The utility model is further illustrated in conjunction with the drawings and specific embodiments.

[0019] Embodiment one

[0020] Referring to Figures 1 to 3 Embodiment one provides an ejection mechanism (hereinafter referred to as ejection mechanism) with stroke limiting, for ejecting the molded injection molded part in the injection mold a certain distance and then keeping it still, and then realizing secondary ejection through other ejector pin structure to complete the demolding of the injection molded part.

[0021] As Figure 1 And Figure 2 The ejection mechanism of the embodiment includes a movable mold 1, at least one ejection assembly 2 arranged on the movable mold 1, and each ejection assembly 2 includes a top block 21, a top rod 22, and an elastically expandable insert pin 23.

[0022] The top block 21 and the top rod 22 are respectively assembled to the movable mold 1 in a lifting manner, the top block 21 is used to eject the injection molded part towards the upper end of the cavity surface 112 of the movable mold 1, the lower end of the top block 21 is connected to the upper end of the top rod 22, specifically, the upper end of the top rod 22 is detachably buckled to the lower end of the top block 21. Of course, in other embodiments, the top rod 22 and the top block 21 can also be fixedly connected through screwing or bonding.

[0023] The insert pin 23 is movably assembled to the ejector pin plate 13 of the movable mold 1, the lower end of the top rod 22 away from the top block 21 is movably inserted into the ejector pin plate 13, and is connected to the upper end of the top rod 22 towards the insert pin 23, the lower end of the insert pin 23 is used to abut against the bottom plate 14 of the movable mold 1 only when the mold is closed, and the bottom plate 14 is fixed on the bottom side of the mold frame of the injection mold.

[0024] A limiting unit is arranged between the movable mold plate 12 and the movable mold core 11 of the movable mold 1, and the limiting unit is used to limit the ejection distance of the top rod 22 when ejection, thereby forming a limiting arrangement for the ejection stroke of the top block 21.

[0025] In the embodiment, as Figure 1As shown, the movable die plate 12 is provided with an inner concave stroke groove 121 on the upper side of the movable die core 11, the movable die core 11 is provided with a guide groove for matching the ejector block 21, the ejector block 21 is movably assembled in the guide groove, and the ejector block 21 movably extends into the stroke groove 121 towards the lower end of the ejector rod 22 and is connected to the ejector rod 22.

[0026] As shown in Figure 2 and Figure 3 , the outer circumferential surface of the ejector rod 22 has a radial protruding limiting step 221, the limiting step 221 movably passes through the stroke groove 121, the guide groove of the movable die core 11 is provided with an abutting groove wall 111 for abutting the limiting step 221 towards the notch of the ejector rod 22, and when ejecting, the limiting step 221 abuts against the abutting groove wall 111 to limit the ejecting stroke of the ejector block 21, at this time, the limiting step 221 and the abutting groove wall 111 jointly constitute the limiting unit.

[0027] Further specifically, as shown in Figure 1 , the ejector pin plate 13 is provided with a mounting groove 131 for accommodating the insert pin 23, the insert pin 23 is movably assembled in the mounting groove 131, and the insert pin 23 movably passes through the bottom groove wall 132 of the mounting groove 131 away from the lower end of the ejector rod 22, when clamping, the insert pin 23 protrudes from the lower end of the side of the ejector pin plate 13 away from the movable die plate 12 and abuts against the bottom plate 14, at this time, the bottom groove wall 132 is close to the bottom plate 14.

[0028] In the specific embodiment, as shown in Figure 1 , the insert pin 23 and the bottom groove wall 132 of the mounting groove 131 are provided with an elastic member 24, and the elastic member 24 is a spring. Of course, in other embodiments, the elastic member 24 can also be a spring.

[0029] As shown in Figure 3 , the insert pin 23 has a head 231 and a rod 232 connected, the spring is movably sleeved on the rod 232, one end of the spring abuts against the head 231, and the other end of the spring abuts against the bottom groove wall 132, so that the insert pin 23 is elastically expandable and contractible, and the lower end of the rod 232 away from the head 231 movably passes through the bottom groove wall 132.

[0030] As shown in Figure 2As shown, after the mold is opened and ejection is needed, the ejector plate 13 rises and compresses the spring to form an upward elastic force, which is applied to the pin 23 through the elastic force to drive the pin 23 to rise synchronously with the ejector rod 22 and the ejector block 21 until the limiting step 221 on the ejector rod 22 abuts against the abutting groove wall 111 on the movable mold core 11. At this time, the upper end of the ejector block 21 protrudes from the cavity surface 112 to a certain distance and then stops rising to realize the first ejection of the injection molded part. Then, the second ejection is realized through other ejector structures in the injection mold to complete the demolding of the injection molded part. During the ejection process, the pin 23 is suspended at the lower end of the ejector plate 13, i.e., the pin 23 does not abut against the bottom plate 14, so as to ensure that the pin 23 has an elastic extension space, thereby ensuring that the ejector plate 13 can only compress the spring when continuing to rise, but the pin 23, the ejector rod 22 and the ejector block 21 do not move any more, so as to realize that the ejector block 21 remains stationary.

[0031] As shown in FIG. 1, the injection mold comprises a bottom plate 14, a movable mold core 11, an ejector block 21, an ejector rod 22, a pin 23, an ejector plate 13, a limiting unit and a spring. Figure 1 As shown, when the mold needs to be closed, the ejector plate 13 descends and returns to the initial position, the ejector block 21 also retracts into the cavity surface 112 of the movable mold core 11, and the ejector rod 22 and the pin 23 also descend synchronously until the pin 23 abuts against the bottom plate 14. At this time, the pin 23 compresses the spring to make the spring in a compressed state and apply an upward elastic force to the pin 23. Then, the pin 23 applies an upward elastic force to the ejector rod 22, thereby ensuring that the ejector block 21 is elastically supported and the overall height of the ejection mechanism remains unchanged.

[0032] In summary, when the injection molded part needs to be ejected, the ejector plate 13 drives the pin 23 to rise, the pin 23 drives the ejector rod 22 to rise, and then the ejector rod 22 drives the upper end of the ejector block 21 protruding from the cavity surface 112 to realize the first ejection of the injection molded part. The limiting unit is used to limit the ejection distance of the ejector rod 22, thereby limiting the ejection stroke of the ejector block 21, i.e., ensuring that the ejector block 21 remains stationary after the preset ejection stroke. The ejection mechanism of the embodiment has a simple structure and effectively limits the ejection stroke of the ejector block 21 under the premise of structural simplification.

[0033] In addition, the assembly process of each component of the ejection structure of the embodiment is also reduced accordingly to reduce the processing cost, thereby ensuring that the cost of the entire injection mold is low and the preparation time before production is short.

[0034] Embodiment Two

[0035] Embodiment Two provides an injection mold, which at least comprises the ejection mechanism with stroke limiting of Embodiment One.

[0036] Although the utility model is specifically shown and introduced in combination with the preferred embodiments, it should be understood by those skilled in the art that various changes can be made to the utility model in form and details without departing from the spirit and scope of the utility model defined in the appended claims, and all of them are within the protection scope of the utility model.

Claims

1. An ejection mechanism with stroke limit, comprising a moving mold, characterized in that: Further comprising an ejection assembly arranged on the movable mold; The ejection assembly comprises an ejector block, an ejector rod and an elastically extendable insert pin; The ejector block and the ejector rod are respectively arranged on the movable mold, and one end of the ejector block is used for ejecting the injection molded part, and the other end of the ejector block is connected to the ejector rod. The insert pin is movably arranged on the ejector pin plate of the movable mold, and the other end of the ejector rod away from the ejector block is movably inserted into the ejector pin plate and connected to one end of the insert pin towards the ejector rod; the other end of the insert pin is used for abutting against the bottom plate of the movable mold only when the mold is closed. A limiting unit is arranged between the movable mold plate and the movable mold core of the movable mold, and the limiting unit is used for limiting the ejection distance of the ejector rod when ejecting, thereby limiting the ejection stroke of the ejector block.

2. The ejection mechanism with stroke limit according to claim 1, characterized in that: One side of the movable mold plate towards the movable mold core is provided with an inner concave stroke groove, and the movable mold core is provided with a guide groove for matching the ejection of the ejector block; the ejector block is movably arranged in the guide groove, and one end of the ejector block towards the ejector rod is movably inserted into the stroke groove and connected to the ejector rod; the outer circumferential surface of the ejector rod has a radially protruding and extending limiting step, the limiting step movably passes through the stroke groove, and the slot opening of the guide groove towards the ejector rod is provided with an abutting groove wall for abutting against the limiting step, and when ejecting, the limiting step abuts against the abutting groove wall to limit the ejection stroke of the ejector block; the limiting step and the abutting groove wall jointly constitute the limiting unit.

3. The ejection mechanism with travel limit according to claim 2, characterized in that: The ejector rod is detachably buckled to the ejector block.

4. The ejection mechanism with stroke limit according to any one of claims 1-3, characterized in that: The installation groove for accommodating the insert pin is arranged in the ejector pin plate, the insert pin is movably arranged in the installation groove, and one end of the insert pin away from the ejector rod movably passes through the groove wall of the installation groove away from the ejector rod; when the mold is closed, the end of the insert pin protruding from one side of the ejector pin plate away from the movable mold plate abuts against the bottom plate.

5. The ejection mechanism with travel limit according to claim 4, characterized in that: An elastic member is arranged between the insert pin and the inner groove wall of the installation groove, so that the insert pin is elastically and extendably arranged; when ejecting, the end of the insert pin exposed to the ejector pin plate is suspended.

6. The ejection mechanism with travel limit according to claim 5, characterized in that: The elastic member is a spring; the insert pin has a connected head and rod, the spring is movably sleeved on the rod; one end of the spring is connected to the head, and the other end of the spring is connected to the inner groove wall of the installation groove; one end of the rod away from the head movably passes through the groove wall of the installation groove close to the bottom plate.

7. An injection mold characterized by: At least the ejection mechanism with stroke limiting as claimed in any one of claims 1-6.

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