Composite ejection mechanism for demolding hot runner mold

Abstract

The utility model discloses a composite ejection mechanism for demolding a hot runner mold. The composite ejection mechanism comprises an ejector pin, a straight ejection assembly, a buckling machine assembly, an upper-layer plate, a lower-layer plate, a bottom plate and a plurality of driving pieces, the lower ends of the thimbles are fixed on the upper-layer plate or the lower-layer plate; the upper ends of the thimbles are connected to the bottom of the runner; the straight ejection assembly comprises a guide rod, a straight ejection mounting block, a straight ejection rod and a straight ejection block, and a first spring is arranged between the straight ejection mounting block and the bottom plate; the buckling machine assembly comprises a firing pin, a sliding block seat and a sliding block, and a plurality of second springs are arranged between the sliding block and the sliding block seat; the firing pin and the straight ejector mounting block jointly penetrate through the first mounting opening of the upper-layer plate and the second mounting opening of the lower-layer plate, the upper end of the firing pin is fixedly connected with the plate B, and the lower end of the firing pin is located between the sliding block and the straight ejector mounting block and is provided with a notch matched with the side face of the sliding block, so that the ejector pin and the straight ejector can reach different heights, a runner sprue is separated from a product, and the product quality is improved. And adhesion is avoided, the product quality is effectively improved, the rejection rate is reduced, and the production safety is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds, in particular to a composite ejection mechanism for demoulding a hot runner mold. Background Art

[0002] A hot runner mold is a mold that uses a heating device to keep the melt in the runner from solidifying. Compared with traditional molds, the molding cycle of hot runner mold parts is shortened. Because there is no cooling time limit for the runner system, the product can be ejected in time after the part is formed and solidified. In pure hot runner molds, there is no cold runner, so there is no production cost, which can reduce material costs. After the part is formed by the hot runner mold, it is a finished product. There is no need to trim the gate and recycle the cold runner, which is conducive to production automation. With these advantages, hot runner molds are widely used in industrially developed countries and regions in the world today.

[0003] However, there are also some problems when using hot runner molds for actual production and processing: since the injection pressure of the hot nozzle is very high, it will have an adverse effect on the nearby ejector mechanism. Its filling pressure causes traditional ejector mechanisms such as straight ejector, ejector pin, and inclined ejector to get stuck during ejection, resulting in difficulty in ejecting the product, causing the product and the runner and gate to stick to the ejector mechanism, which not only affects the product quality and reduces the yield rate, but also poses a hidden danger to production safety. Utility Model Content

[0004] The utility model is developed to solve the above problems and aims to provide a composite ejection mechanism for hot runner mold demoulding which can improve production efficiency.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A composite ejector mechanism for demoulding a hot runner mold is provided in a hot runner mold device, the hot runner mold device further comprising a stackable A plate and a B plate, the composite ejector mechanism for demoulding a hot runner mold comprises an ejector pin, a straight ejector assembly, a buckle assembly, an upper plate, a lower plate, and a bottom plate arranged sequentially below the B plate from top to bottom, and a plurality of driving members for driving the upper plate and the lower plate to rise and fall synchronously, wherein:

[0007] The ejector pin is arranged vertically, the lower end of the ejector pin is fixed on the upper plate or the lower plate, and the upper end of the ejector pin is connected to the bottom of the flow channel;

[0008] The straight top assembly comprises a guide rod whose lower end is fixed on the bottom plate, a straight top mounting block movably connected to the upper end of the guide rod, a straight top rod whose lower end is fixed to the top of the straight top mounting block, and a straight top block mounted on the upper end of the straight top rod, and a first spring is arranged between the straight top mounting block and the bottom plate;

[0009] The upper plate and the lower plate are respectively provided with a first mounting opening and a second mounting opening, and the first mounting opening is connected with the second mounting opening up and down;

[0010] The trigger assembly includes a vertically arranged striker, a slider seat located at one side of the second mounting opening, and a slider horizontally movably connected to the slider seat, and a plurality of second springs are arranged between the slider and the slider seat;

[0011] The striker and the straight top mounting block are jointly arranged on the first mounting opening and the second mounting opening. The upper end of the striker is fixedly connected to the B plate, and the lower end of the striker is located between the slider and the straight top mounting block and has a recess adapted to the side of the slider.

[0012] Furthermore, the driving member is a cylinder, and there are two of them. The two cylinders are respectively installed on both sides of the B plate, and the output ends of the two cylinders are downwardly connected to both sides of the upper plate and the lower plate respectively.

[0013] Furthermore, the lower end of the guide rod has a thickened base, which is fastened to the base plate by bolts; an inner cavity is opened in the middle of the straight top mounting block, the upper cavity of the inner cavity is adapted to the upper end of the guide rod, the first spring is sleeved on the guide rod, the lower cavity of the inner cavity is adapted to the first spring, and a first step is formed between the upper cavity and the lower cavity; the lower end of the first spring is against the thickened base, and the upper end of the first spring is against the first step.

[0014] Furthermore, a second step is provided on the outside of the straight top mounting block, and the second step is located below the upper plate and is used to abut against the bottom of the upper plate to vertically limit the straight top mounting block.

[0015] Furthermore, the upper and lower ends of the straight push rod are fastened to the straight push block and the straight push mounting block by bolts respectively, and a sleeve is sleeved on the outside of the straight push rod, and the sleeve is fixedly arranged in the B plate for guiding the straight push rod.

[0016] Furthermore, the slider seat is embedded in the lower part of the lower plate and is fastened to the lower plate by bolts; the side surface of the slider seat has a slider installation groove facing the second installation port, and the slider is arranged in the slider installation groove.

[0017] Furthermore, a countersunk hole is transversely formed on the slider; the trigger assembly also includes a limiting bolt, the tail end of which is fastened to the bottom of the slider mounting slot, and the head end is transversely penetrated on the slider through the countersunk hole.

[0018] Furthermore, a chamfer is provided on the top of a side of the sliding block facing the second mounting opening.

[0019] Furthermore, a plurality of limiting pads are provided on the top of the upper plate.

[0020] Furthermore, a plurality of limiting pads are provided on the top of the upper plate.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] 1. The composite ejection mechanism for hot runner mold demoulding of the utility model combines the ejector pin and the straight ejector, which can respectively lift the runner and the product. Through the cooperation of the striker and the slider, the ejector pin and the straight ejector can reach different lifting heights, thereby separating the runner gate from the product to avoid adhesion, which can effectively improve product quality, reduce the scrap rate, and improve the safety of the production process.

[0023] 2. The composite ejection mechanism for hot runner mold demoulding of the utility model can realize automatic resetting through the cooperation of the striker and the slider and the action of the spring force. The overall structure is simple, the movement is smooth and not easy to get stuck, the stability is strong, the reliability is high, and it has a high value for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the hot runner mold device;

[0025] Figure 2 It is a schematic diagram of the internal structure of the hot runner mold device;

[0026] Figure 3 It is a cross-sectional view of the hot runner mold device when the composite ejection mechanism for hot runner mold demoulding is in the initial position;

[0027] Figure 4 yes Figure 3 A magnified view of the structure within the middle circle A;

[0028] Figure 5 is a transverse cross-sectional view of the trigger assembly (the firing pin is not shown);

[0029] Figure 6 It is a schematic diagram of the product, runner and straight ejector block when the composite ejector mechanism for hot runner mold demoulding is in the initial position;

[0030] Figure 7 It is a cross-sectional view of the hot runner mold when the composite ejection mechanism ejects the product for the first distance;

[0031] Figure 8 It is a cross-sectional view of the hot runner mold when the composite ejection mechanism ejects the product for the second distance;

[0032] Fig. 9 yes Figure 8 Magnified view of the structure within the middle circle B.

[0033] Figure Number:

[0034] 1-A plate, 2-B plate, 3-front mold core, 4-rear mold core, 5-hot nozzle, 6-flow channel, 7-gate, 8-product; 10-ejector pin; 20-straight ejector assembly, 21-guide rod, 211-thickened base, 22-straight ejector mounting block, 221-inner cavity, 222-first step, 223-second step, 23-straight ejector rod, 24-straight ejector block, 25-first spring, 26-sleeve; 3 0-machine trigger assembly, 31-striker, 311-recess, 32-slider seat, 321-slider mounting groove, 33-slider, 331-countersunk hole, 332-chamfer, 34-second spring, 35-limiting bolt; 41-upper plate, 411-first mounting port, 42-lower plate, 421-second mounting port, 43-bottom plate, 44-limiting pad, 45-supporting pad; 50-driving member. DETAILED DESCRIPTION

[0035] In order to make the technical means, creative features, objectives and effects achieved by the utility model easy to understand, the following embodiments are combined with the accompanying drawings to specifically illustrate the composite ejection mechanism for hot runner mold demoulding of the utility model.

[0036] like Figures 1 to 3 As shown, the composite ejection mechanism for demoulding the hot runner mold of this embodiment is arranged in the hot runner mold device, and the hot runner mold device also includes a stackable A plate 1 and a B plate 2, a front mold core 3 is arranged on the A plate 1, and a rear mold core 4 is arranged on the B plate 2, and the two are stacked to form a mold cavity, and a hot nozzle 5 for injecting melt is arranged on the A plate 1, and the melt flowing out of the hot nozzle 5 flows into the mold cavity through the runner 6 to form the shape of the product 8, and the runner 6 outlet (gate 7) is located below the mold cavity. The runner 6 material is consistent with the product 8 material, usually a plastic molding material.

[0037] The composite ejection mechanism for hot runner mold demoulding includes an ejector pin 10, a straight ejector assembly 20, a latch assembly 30, an upper plate 41, a lower plate 42, and a bottom plate 43 arranged from top to bottom below the B plate 2, and a plurality of driving members 50 for driving the upper plate 41 and the lower plate 42 to rise and fall synchronously, wherein:

[0038] The ejector pin 10 is arranged vertically, the lower end of the ejector pin 10 is fixed on the upper plate 41 or the lower plate 42, and the upper end of the ejector pin 10 is connected to the bottom of the flow channel 6;

[0039] The straight top assembly 20 includes a guide rod 21 whose lower end is fixed on the bottom plate 43, a straight top mounting block 22 movably connected to the upper end of the guide rod 21, a straight top rod 23 whose lower end is fixed to the top of the straight top mounting block 22, and a straight top block 24 mounted on the upper end of the straight top rod 23, and a first spring 25 is provided between the straight top mounting block 22 and the bottom plate 43;

[0040] The upper plate 41 and the lower plate 42 are respectively provided with a first installation opening 411 and a second installation opening 421, and the first installation opening 411 is connected with the second installation opening 421 in vertical communication;

[0041] like Figure 4 , 5 As shown, the trigger assembly 30 includes a vertically arranged striker 31, a slider seat 32 located at one side of the second mounting opening 421, and a slider 33 horizontally movably connected to the slider seat 32, and a plurality of second springs 34 are arranged between the slider 33 and the slider seat 32;

[0042] The striker 31 and the straight top mounting block 22 are jointly inserted into the first mounting opening 411 and the second mounting opening 421 . The upper end of the striker 31 is fixedly connected to the B plate 2 . The lower end of the striker 31 is located between the slider 33 and the straight top mounting block 22 and has a recess 311 adapted to the side of the slider 33 .

[0043] Specifically, the driving member 50 is a cylinder, such as Figure 1 , 2 As shown, in this embodiment, there are two driving members 50, and the two oil cylinders are respectively installed on both sides of the B plate 2, and the output ends of the two oil cylinders are respectively connected downward to the upper plate 41 and the lower plate 42, thereby driving the upper plate 41 and the lower plate 42 to rise and fall synchronously. In this embodiment, the upper plate 41 and the lower plate 42 are fastened by a plurality of bolts.

[0044] Further, such as Figure 3 , 9 As shown, the lower end of the guide rod 21 has a thickened base 211, which is fastened to the bottom plate 43 by bolts; an inner cavity 221 is opened in the middle of the straight top mounting block 22, the upper cavity of the inner cavity 221 is adapted to the upper end of the guide rod 21, the first spring 25 is sleeved on the guide rod 21, the lower cavity of the inner cavity 221 is adapted to the first spring 25, and a first step 222 is formed between the upper cavity and the lower cavity of the inner cavity 221 of the straight top mounting block; the lower end of the first spring 25 is against the thickened base 211, and the upper end of the first spring 25 is against the first step 222, thereby applying an upward spring force to the straight top mounting block 22.

[0045] Furthermore, the straight top mounting block 22 has a second step 223 on the outside. The second step 223 is located below the upper plate 41 and can abut against the bottom of the upper plate 41 to vertically limit the straight top mounting block 22 .

[0046] Furthermore, the upper and lower ends of the straight push rod 23 are respectively fastened to the straight push block 24 and the straight push mounting block 22 by bolts, and a sleeve 26 is sleeved on the outside of the straight push rod 23, and the sleeve 26 is fixedly arranged in the B plate 2 to guide the straight push rod 23. In this embodiment, the straight push block 24 is made of S136 material and is heat-treated, and the hardness (HRC) is 48-52.

[0047] Further, such as Figures 3 to 5 As shown, the slider seat 32 is embedded in the lower part of the lower plate 42 and is fastened to the lower plate 42 by bolts; the side of the slider seat 32 has a slider mounting groove 321 facing the second mounting port 421, and the slider 33 is arranged in the slider mounting groove 321, and can move laterally along the depth direction of the slider mounting groove 321 under the action of external force; the two ends of the second spring 34 are respectively against the slider 33 and the slider seat 32, and can apply a spring force to the slider 33 away from the slider seat 32, so that after the lower plate 42 rises, the slider 33 can press the striker 31 from the side.

[0048] Furthermore, a countersunk hole 331 is transversely provided on the slider 33, and the trigger assembly 30 also includes a limiting bolt 35, the tail end of the limiting bolt 35 is fastened to the bottom of the slider mounting slot 321, and the head end is transversely penetrated on the slider 33 through the countersunk hole 331. The head of the limiting bolt 35 can abut against the step in the countersunk hole 331, thereby laterally limiting the slider 33, so that when the slider 33 moves to the extreme position, the distance between the side of the slider 33 and the side of the straight top mounting block 22 is adapted to the bottom size of the ejector pin 10, so that the lower end of the striker 31 can be smoothly inserted into the gap between the slider 33 and the straight top mounting block 22.

[0049] Furthermore, a chamfer 332 is provided on the top of the slider 33 facing the second mounting opening 421 , so that the slider 33 can move relatively smoothly along the side of the ejector pin 10 to avoid jamming.

[0050] Furthermore, a plurality of limiting pads 44 are provided on the top of the upper plate 41 , which can abut against the bottom of the B plate 2 to limit the rising height of the upper plate 41 and the lower plate 42 , thereby limiting the lifting height of the ejector pin 10 .

[0051] In this embodiment, a plurality of support pads 45 are further provided on the upper surface of the bottom plate 43 , which abut against the lower surface of the lower plate 42 when the upper and lower plates 42 are not lifted, thereby providing partial support force for the lower plate 42 .

[0052] The ejection process is mainly divided into two stages:

[0053] like Figures 3 to 6As shown, when the composite ejection mechanism is in the initial position, the upper plate 41 and the lower plate 42 are closely against the bottom plate 43, the slider 33 is against the head of the limit bolt 35 under the action of the second spring 34, the lower end of the striker 31 is not in contact with the slider 33, the bottom of the straight top mounting block 22 is closely against the bottom plate 43, the straight top assembly 20 is located below the mold cavity, the straight top block 24 is against the bottom edge of the molded product 8 in the mold cavity, and the outlet end of the runner 6 is located below the straight top block 24.

[0054] like Figure 7 As shown, in the first stage, the composite ejection mechanism starts to act, and the upper plate 41 and the lower plate 42 rise a first distance (i.e. Figure 3 , 4 In this process, the straight top mounting block 22 is synchronously lifted along with the upper and lower plates 42 under the action of the first spring 25, and the second step 223 is still against the bottom of the upper plate 41. The straight top mounting block 22 simultaneously drives the straight top rod 23 and the straight top block 24 to rise, and the straight top block 24 ejects the product 8 out of the mold cavity; the ejector pin 10 is synchronously lifted along with the upper plate 41 and the lower plate 42, so that the flow channel 6 is lifted along with the product 8; during the lifting process of the upper and lower plates 42, the lower end of the striker 31 is gradually inserted into the gap between the slider 33 and the straight top mounting block 22, and after rising for the first distance (X1), the side surface of the slider 33 fits with the notch 311 at the bottom of the striker 31.

[0055] like Figure 8 , 9 As shown, in the second stage, the upper plate 41 and the lower plate 42 continue to rise by a second distance (i.e. Figure 3 , 7 X2 in the figure), the upper plate 41 is close to the lower part of the B plate 2. In this process, the slider 33 moves out of the notch 311, and the slider 33 is retracted into the slider installation groove 321 under the push of the striker 31. In contrast, the slider 33 presses the striker 31 from the side under the spring force of the second spring 34, increasing the friction between the striker 31 and the straight top mounting block 22, so that the striker 31 presses the straight top mounting block 22, and the straight top mounting block 22 stops at the height after moving the first distance (X1) and does not continue to rise with the upper and lower plates 42. The straight top rod 23 and the straight top block 24 also stay at the position at the end of the first stage. The second step 223 is separated from the bottom of the upper plate 41; the ejector pin 10 rises the second distance (X2) along with the upper plate 41 and the lower plate 42, driving the flow channel 6 to rise. During this period, since the outlet of the flow channel 6 was originally located below the straight ejector block 24 and was blocked by the straight ejector block 24, the ejector pin 10 drives the flow channel 6 to rise so that the outlet of the flow channel 6 is separated from the product 8, the flow channel 6 is deformed, and the outlet of the flow channel 6 escapes from the bottom of the straight ejector block 24 and rises to the top of the straight ejector block 24. At the same time, the flow channel 6 abuts against the bottom of the product 8 to continue to eject the product 8 for the second distance (X2).

[0056] The above implementation modes are preferred examples of the present invention and are not intended to limit the protection scope of the present invention.

Claims

1. A composite ejection mechanism for hot runner mold demoulding, arranged in a hot runner mold device, the hot runner mold device also includes a stackable A plate and a B plate, characterized in that: It includes ejector pins, a straight ejector assembly, a locking assembly, an upper plate, a lower plate, and a bottom plate arranged from top to bottom below the B plate, and several driving parts for driving the upper plate and the lower plate to rise and fall synchronously, wherein: The ejector pin is arranged vertically, the lower end of the ejector pin is fixed on the upper plate or the lower plate, and the upper end of the ejector pin is connected to the bottom of the flow channel; The straight top assembly comprises a guide rod fixed at the lower end on the bottom plate, a straight top mounting block movably connected to the upper end of the guide rod, a straight top rod fixed at the lower end on the top of the straight top mounting block, and a straight top block mounted on the upper end of the straight top rod, and a first spring is provided between the straight top mounting block and the bottom plate; The upper plate and the lower plate are respectively provided with a first mounting opening and a second mounting opening, and the first mounting opening is connected with the second mounting opening in vertical communication; The trigger assembly includes a vertically arranged striker, a slider seat located at one side of the second mounting opening, and a slider horizontally movably connected to the slider seat, and a plurality of second springs are arranged between the slider and the slider seat; The striker and the straight top mounting block are jointly inserted into the first mounting port and the second mounting port, the upper end of the striker is fixedly connected to the B plate, and the lower end of the striker is located between the slider and the straight top mounting block and has a recess adapted to the side of the slider.

2. The composite ejection mechanism for hot runner mold demoulding according to claim 1, characterized in that: The driving member is a cylinder, and there are two of them. The two cylinders are respectively installed on both sides of the B plate, and the output ends of the two cylinders are downwardly connected to both sides of the upper plate and the lower plate respectively.

3. The composite ejection mechanism for hot runner mold demoulding according to claim 1, characterized in that: The lower end of the guide rod has a thickened base, and the thickened base is fastened to the bottom plate by bolts; An inner cavity is provided in the middle of the straight top mounting block, the upper cavity of the inner cavity is matched with the upper end of the guide rod, the first spring is sleeved on the guide rod, the lower cavity of the inner cavity is matched with the first spring, and a first step is formed between the upper cavity and the lower cavity; The lower end of the first spring abuts against the thickened base, and the upper end of the first spring abuts against the first step.

4. The composite ejection mechanism for hot runner mold demoulding according to claim 1, characterized in that: The straight top mounting block has a second step on the outside, and the second step is located below the upper plate and is used to abut against the bottom of the upper plate to vertically limit the straight top mounting block.

5. The composite ejection mechanism for hot runner mold demoulding according to claim 1, characterized in that: The upper and lower ends of the straight push rod are fastened to the straight push block and the straight push mounting block by bolts respectively. A sleeve is sleeved outside the straight push rod, and the sleeve is fixedly arranged in the B plate for guiding the straight push rod.

6. The composite ejection mechanism for hot runner mold demoulding according to claim 1, characterized in that: The slider seat is embedded in the lower part of the lower plate and is fastened to the lower plate through bolts; The side surface of the slider seat has a slider installation groove facing the second installation opening, and the slider is arranged in the slider installation groove.

7. The composite ejection mechanism for hot runner mold demoulding according to claim 6, characterized in that: The slider is provided with a countersunk hole transversely; The trigger assembly also includes a limiting bolt, the tail end of which is tightly connected to the bottom of the slider installation slot, and the head end of which is laterally penetrated on the slider through the countersunk hole.

8. The composite ejection mechanism for hot runner mold demoulding according to claim 1, characterized in that: A chamfer is provided on the top of the sliding block on one side facing the second mounting opening.

9. The composite ejection mechanism for hot runner mold demoulding according to claim 1, characterized in that: A plurality of limiting pads are also arranged on the top of the upper plate.

10. The composite ejection mechanism for hot runner mold demoulding according to claim 1, characterized in that: The upper surface of the bottom plate is also provided with a plurality of supporting pads.

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