Hot runner backflow mold with ejection mechanism

Abstract

The utility model relates to a hot runner backward flow mold with an ejection mechanism, which comprises a fixed mold, a movable mold, an ejection mechanism and a rear mold, and is characterized in that the fixed mold comprises a fixed mold plate with an upper molding cavity; the movable mold comprises a movable mold plate, a slow-out medium finger and a slow-out spring, the slow-out medium finger is installed in the movable mold plate, the slow-out spring applies elastic force to the slow-out medium finger, the movable mold plate is provided with a lower forming cavity, the lower forming cavity corresponds to the upper forming cavity, and the slow-out medium finger is exposed out of the surface of the movable mold plate; the ejection assembly comprises an ejector pin capable of extending into the upper forming cavity, a return pin for supporting the ejector pin and a return pin intermediate finger fixedly connected with the return pin, the return pin intermediate finger is exposed on the surface of the fixed mold plate, and the return pin intermediate finger corresponds to the slow ejection intermediate finger; the ejection assembly is placed in the fixed mold, the slow-out spring pushes the slow-out medium finger to continuously abut against the return pin medium finger during mold opening, ejection of the ejector pin is delayed, plastic parts are prevented from being damaged, and the purpose of full-automatic plastic part production is achieved.

Description

TECHNICAL FIELD

[0001] The application relates to a mold technical field, in particular to a hot runner back-filling mold with an ejection mechanism. BACKGROUND

[0002] The injection mold is a tool matched with a plastic forming machine in the plastic processing industry, which gives a plastic product a complete configuration and accurate size. When a plastic part is formed, the molten plastic enters a forming cavity through a flow channel. After the plastic part is formed in the forming cavity, the mold is demolded, and then the plastic part is completely taken out.

[0003] According to the Chinese patent CN212194039U, a horn-shaped glue feeding injection mold flow channel structure is disclosed. The material guide end of the horn-shaped material channel is connected with the glue feeding flow channel, the material injection end of the horn-shaped material channel is connected with the injection port of the injection mold, and the cross-sectional area of the horn-shaped material channel gradually decreases from the material guide end to the material injection end. Since some plastic products have high appearance requirements and need to be post-processed and sprayed on the surface, glue needs to be injected on the back of the product. However, due to the characteristics of the plastic material (PC+GF20%) used for the plastic product, the horn-shaped glue feeding is prone to horn breakage, and manual material head removal is required, which prolongs the molding cycle and cannot realize full-automatic production.

[0004] Therefore, it is necessary to develop a hot runner back-filling mold with an ejection mechanism to solve the above problems. Content of the utility model

[0005] The utility model aims at providing a hot runner back-filling mold with an ejection mechanism, which can realize full-automatic production.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a hot runner back-filling mold with an ejection mechanism, which comprises:

[0007] The fixed mold comprises a fixed mold plate, and the fixed mold plate has an upper forming cavity;

[0008] The movable mold comprises a movable mold plate, a slow-ejection finger installed in the movable mold plate, and a slow-ejection spring for applying elastic force to the slow-ejection finger. The movable mold plate has a lower forming cavity corresponding to the upper forming cavity, and the slow-ejection finger is exposed on the surface of the movable mold plate.

[0009] The ejection assembly comprises a ejector pin capable of extending into the upper forming cavity, a needle returner supporting the ejector pin, and a needle returner finger fixedly connected with the needle returner. The needle returner finger is exposed on the surface of the fixed mold plate, and the needle returner finger corresponds to the slow-ejection finger.

[0010] Further, the ejection assembly comprises a top plate movably arranged in the fixed mold plate, and the ejector pin is fixedly connected with the top plate.

[0011] Further, the ejection assembly comprises an upper limiting member, which is connected with the fixed mold plate through the top plate vertically from above the top plate, and the top plate moves vertically along the upper limiting member.

[0012] Further, the upper limiting member is sleeved with an ejector pin spring, one end of the ejector pin spring abuts against the upper limiting member, and the other end abuts against the top plate.

[0013] Further, the top end of the return needle penetrates through the fixed mold plate and is connected with the top plate, and the return needle is fixedly installed at the bottom end of the return needle.

[0014] Further, the slow-ejection intermediate finger is fixedly connected with a lower limiting member, and the lower limiting member is connected with the slow-ejection intermediate finger at the top and extends vertically into the movable mold plate at the bottom.

[0015] Further, the slow-ejection spring is sleeved with the lower limiting member, one end of the slow-ejection spring abuts against the movable mold plate, and the other end abuts against the slow-ejection intermediate finger.

[0016] Further, the fixed mold comprises a stripping plate, the stripping plate is internally provided with an ejector pin and an ejector pin spring, one end of the ejector pin is located in the stripping plate, the other end penetrates through the stripping plate, and the ejector pin spring abuts against the ejector pin.

[0017] Further, the movable mold plate is further provided with an on-off device, the on-off device is installed on the upper surface of the movable mold plate, one end of the on-off device is fixedly connected with the movable mold plate, and the other end extends vertically upward.

[0018] Compared with the prior art, the hot runner backflow mold with the ejection mechanism has the characteristics of full-automatic production, the ejection assembly is placed in the fixed mold, the slow-ejection intermediate finger is continuously abutted against the return needle intermediate finger at the time of mold opening through the slow-ejection spring, the ejection of the ejector pin is delayed, the plastic part is prevented from being damaged, and the purpose of full-automatic production of the plastic part is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the premise of not deviating from the concept of the present application.

[0020] Figure 1 It is a three-dimensional structure diagram of the hot runner backflow mold with the ejection mechanism.

[0021] Figure 2 It is Figure 1 It is a partial structure diagram of the fixed mold of the hot runner backflow mold with the ejection mechanism.

[0022] Figure 3 As Figure 1 The fixed die internal structure diagram of the hot runner backfill mold with the ejection mechanism is shown in the figure.

[0023] Figure 4 As Figure 1 The fixed die plate structure diagram of the hot runner backfill mold with the ejection mechanism is shown in the figure.

[0024] Figure 5 As Figure 4 The fixed die plate structure diagram of the hot runner backfill mold with the ejection mechanism is shown in the figure.

[0025] Figure 6 As Figure 1 The partial structure diagram of the hot runner backfill mold with the ejection mechanism is shown in the figure.

[0026] Figure 7 As Figure 1 The partial structure diagram of the hot runner backfill mold with the ejection mechanism is shown in the figure.

[0027] In the figure: 1, fixed die; 2, movable die; 3, ejection assembly; 11, upper fixed plate; 12, runner plate; 13, stripping plate; 14, fixed die plate; 111, heating pipe; 112, heating interface; 113, glue injection port; 121, needle valve type hot runner system; 122, needle valve type hot runner system interface; 123, fixed plate; 124, fixed rod; 125, guide column; 131, spring needle; 132, spring needle spring; 141, runner; 142, runner plate; 143, fixed die core; 144, runner groove; 145, upper forming cavity; 21, lower fixed plate; 22, movable die plate; 221, movable die core; 222, lower forming cavity; 23, slow-out finger; 24, lower limit piece; 25, slow-out spring; 26, shutter; 31, top plate; 32, ejector pin; 33, upper limit piece; 34, ejector pin spring; 35, return pin; 36, return pin finger. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] Please refer to Figures 1 to 7 The present application is a hot runner backfill mold with an ejection mechanism, which comprises a fixed die 1 and a movable die 2 connected to the fixed die 1.

[0030] The fixed mold 1 comprises an upper fixed plate 11, a hot runner plate 12 connected with the upper fixed plate 11, a stripper plate 13 below the hot runner plate 12 and a fixed mold plate 14.

[0031] The upper fixed plate 11 is fixedly connected with the hot runner plate 12 and is in a horizontal state. The upper fixed plate 11 is provided with a heating pipeline 111 inside. The heating pipeline 111 is distributed in a zigzag manner inside the upper fixed plate 11 and penetrates the side surface of the upper fixed plate 11. The side surface of the upper fixed plate 11 is provided with a heating interface 112. The heating pipeline 111 is connected with the heating interface 112. The upper fixed plate 11 is also provided with a glue injection port 113 penetrating the upper and lower surfaces thereof. The heating pipeline 111 surrounds the glue injection port 113.

[0032] The hot runner plate 12 is below the upper fixed plate 11. The hot runner plate 12 is provided with a needle valve type hot runner system 121 inside. The needle valve type hot runner system 121 is a prior art and will not be explained in detail. The needle valve type hot runner system 121 is fixed in the hot runner plate 12. The glue injection port 113 is in communication with the needle valve type hot runner system 121. The bottom of the needle valve type hot runner system 121 penetrates the stripper plate 13 and extends into the fixed mold plate 14. The outside of the hot runner plate 12 is provided with a needle valve type hot runner system interface 122. The needle valve type hot runner system 121 is connected with the needle valve type hot runner system interface 122.

[0033] The lower surface of the hot runner plate 12 is provided with a fixed plate 123. The fixed plate 123 is provided with a plurality of fixed rods 124. The top ends of the fixed rods 124 are fixedly connected with the fixed plate 123. The bottom ends of the fixed rods 124 extend vertically downward to the surface of the fixed mold plate 14.

[0034] The hot runner plate 12 is provided with a guide column 125. The top of the guide column 125 is fixedly connected with the hot runner plate 12. The bottom of the guide column 125 extends vertically downward and penetrates the stripper plate 13 and the fixed mold plate 14 in sequence.

[0035] The stripper plate 13 is sleeved with the guide column 125 and moves along the guide column 125. The stripper plate 13 is provided with a spring needle 131 and a spring needle spring 132 inside. One end of the spring needle 131 is located in the stripper plate 13. The other end of the spring needle 131 penetrates the stripper plate 13. The spring needle spring 132 abuts against the spring needle 131. When the mold is closed, the spring needle spring 132 is in a compressed state. When the mold is opened, the spring needle spring 132 is released. The elastic force of the spring needle spring 132 pushes the spring needle 131 to move toward the fixed mold plate 14.

[0036] The fixed mold plate 14 is sleeved with the guide column 125 and moves along the guide column 125, the fixed mold plate 14 has a flow channel 141 penetrating through the upper and lower surfaces thereof, a flow channel plate 142 located at one end of the flow channel 141, a fixed mold core 143 located at the other end of the flow channel 141, the flow channel plate 142 is recessed inward from the upper surface to form a flow channel groove 144, the flow channel groove 144 is communicated with the flow channel plate 142, the fixed mold core 143 is recessed inward from the lower surface to form an upper forming cavity 145, the upper forming cavity 145 is communicated with the flow channel plate 142, the flow channel plate 142 and the fixed mold core 143 are both installed in the fixed mold plate 14, the end of the needle valve type hot runner system 121 corresponds to the flow channel groove 144, and the ends of the plurality of fixed rods 124 extend above the flow channel groove 144.

[0037] The fixed mold plate 14 is provided with an ejection assembly 3, the ejection assembly 3 comprises a top plate 31, a ejector pin 32 fixedly connected with the top plate 31 and an upper limiting piece 33 limiting the top plate 31, the top plate 31 is located in the fixed mold plate 14, one end of the ejector pin 32 is fixedly connected with the top plate 31, the other end of the ejector pin 32 vertically penetrates through the fixed mold plate 14 and can extend into the upper forming cavity 145, the upper limiting piece 33 is a certain bolt or screw, vertically penetrates through the top plate 31 from above the top plate 31 and is connected with the fixed mold plate 14, the top plate 31 moves vertically along the upper limiting piece 33, the upper limiting piece 33 is sleeved with an ejector pin spring 34, one end of the ejector pin spring 34 abuts against the upper limiting piece 33, and the other end of the ejector pin spring 34 abuts against the top plate 31.

[0038] The ejection assembly 3 is further provided with a needle returning piece 35 and a needle returning finger 36, the needle returning finger 36 is fixedly installed at the bottom end of the needle returning piece 35, the top end of the needle returning piece 35 penetrates through the fixed mold plate 14 and is connected with the top plate 31, and the needle returning finger 36 is exposed to the lower surface of the fixed mold plate 14.

[0039] The movable mold 2 comprises a lower fixed plate 21 and a movable mold plate 22 fixedly connected with the lower fixed plate 21.

[0040] The lower fixed plate 21 is in a horizontal state and is used for supporting the movable mold plate 22.

[0041] The movable mold plate 22 is provided with a movable mold core 221 corresponding to the fixed mold core 143, and the movable mold core 221 has a lower forming cavity 222 recessed inward from the upper surface, and the lower forming cavity 222 corresponds to the upper forming cavity 145.

[0042] The movable mold 2 further comprises a slow ejection finger 23 arranged in the movable mold plate 22, a lower limiting piece 24 fixedly connected with the slow ejection finger 23 and a slow ejection spring 25 sleeved with the lower limiting piece 24, the slow ejection finger 23 is sleeved at the top of the lower limiting piece 24 and is exposed to the upper surface of the movable mold plate 22, the lower limiting piece 24 is a certain bolt or screw, the top of the lower limiting piece 24 is connected with the slow ejection finger 23, and the bottom of the lower limiting piece 24 extends vertically into the movable mold plate 22, one end of the slow ejection spring 25 abuts against the movable mold plate 22, and the other end of the slow ejection spring 25 abuts against the slow ejection finger 23, the slow ejection finger 23 corresponds to the needle returning finger 36 and abuts against the needle returning finger 36 during mold clamping.

[0043] The movable die plate 22 is further provided with an opening and closing device 26, which is installed on the upper surface of the movable die plate 22, one end of which is fixedly connected with the movable die plate 22, and the other end of which extends vertically upward, for increasing the friction between the movable die plate 22 and the fixed die plate 14, so that the movable die plate 22 and the fixed die plate 14 are finally opened.

[0044] The hot runner backflow mold with the ejection mechanism has the characteristics of full-automatic production, the ejection assembly is placed in the fixed die, the buffer ejection finger is continuously in contact with the needle return finger during mold opening by the buffer spring, the ejection of the ejector pin is delayed, the plastic part is prevented from being damaged, and the purpose of full-automatic production of the plastic part is achieved.

[0045] The hot runner backflow mold with the ejection mechanism has the characteristics of full-automatic production, the ejection assembly is placed in the fixed die, the buffer ejection finger is continuously in contact with the needle return finger during mold opening by the buffer spring, the ejection of the ejector pin is delayed, the plastic part is prevented from being damaged, and the purpose of full-automatic production of the plastic part is achieved.

[0046] The above merely describes a preferred embodiment of the utility model, and the protection scope of the utility model is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, and all of them should be covered in the protection scope of the utility model.

Claims

1. A hot runner, backfill mold having an ejection mechanism, characterized by, It includes: The fixed mold (1) includes a fixed mold plate (14), the fixed mold plate (14) has an upper forming cavity (145); The movable mold (2) includes a movable mold plate (22), a slow-ejection finger (23) mounted in the movable mold plate (22), a slow-ejection spring (25) exerting force on the slow-ejection finger (23), the movable mold plate (22) has a lower forming cavity (222) corresponding to the upper forming cavity (145), and the slow-ejection finger (23) is exposed on the surface of the movable mold plate (22); The ejection assembly (3) includes a ejector pin (32) that can extend into the upper forming cavity (145), a needle return (35) supporting the ejector pin (32), and a needle return finger (36) fixedly connected with the needle return (35), the needle return finger (36) is exposed on the surface of the fixed mold plate (14), and the needle return finger (36) corresponds to the slow-ejection finger (23).

2. The hot runner, backfill mold with ejection mechanism of claim 1 wherein, The ejection assembly (3) includes a top plate (31) movably arranged in the fixed mold plate (14), and the ejector pin (32) is fixedly connected with the top plate (31).

3. The hot runner, backfill mold with ejection mechanism of claim 2, wherein, The ejection assembly (3) includes an upper limiting piece (33) vertically penetrating the top plate (31) from above the top plate (31) and connected with the fixed mold plate (14), and the top plate (31) moves vertically along the upper limiting piece (33).

4. The hot runner, backfill mold with ejection mechanism of claim 3, wherein, The upper limiting piece (33) is sleeved with a ejector pin spring (34), one end of the ejector pin spring (34) abuts against the upper limiting piece (33), and the other end abuts against the top plate (31).

5. The hot runner, backfill mold with ejection mechanism of claim 3 wherein, The top end of the needle return (35) penetrates the fixed mold plate (14) and is connected with the top plate (31), and the needle return finger (36) is fixedly installed at the bottom end of the needle return (35).

6. The hot runner, backfill mold with ejection mechanism of claim 1 wherein, The slow-ejection finger (23) is fixedly connected with a lower limiting piece (24), the lower limiting piece (24) is connected with the slow-ejection finger (23) at the top and extends vertically into the movable mold plate (22) at the bottom.

7. The hot runner, backfill mold with ejection mechanism of claim 6 wherein, The slow-ejection spring (25) sleeves the lower limiting piece (24), one end of the slow-ejection spring (25) abuts against the movable mold plate (22), and the other end abuts against the slow-ejection finger (23).

8. The hot runner, backfill mold with ejection mechanism of claim 1 wherein, The fixed mold (1) includes a stripper plate (13), the stripper plate (13) is internally provided with a spring needle (131) and a spring needle spring (132), one end of the spring needle (131) is located in the stripper plate (13), the other end penetrates the stripper plate (13), and the spring needle spring (132) abuts against the spring needle (131).

9. The hot runner, backfill mold with ejection mechanism of claim 1 wherein, The movable mold plate (22) is also provided with an opener (26) mounted on the upper surface thereof, one end of the opener (26) is fixedly connected with the movable mold plate (22), and the other end extends vertically upward.

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