Injection mold ejection mechanism

Abstract

The utility model relates to the technical field of injection molds, and discloses an injection mold ejection mechanism which comprises a first ejection mechanism, a second ejection mechanism, a bottom plate, an upper mold plate, a lower mold plate and four sliding rods, and the four sliding rods are fixedly installed at the four corners between the bottom plate and the upper mold plate respectively. The lower die plate is arranged at the outer ends of the four sliding rods in a sliding and sleeving mode. According to the injection mold, air is compressed through the air pump, then the compressed air is fed into the fixing cavity through the air pipe and the air flow channel, the first ejector rod is upwards impacted through the air, meanwhile, the first spring is compressed, and the first ejector rod moves upwards, so that the middle of a plastic part can be slightly ejected; in addition, the first ejection rod and the ejection hole are not sealed any more, and gas is ejected from the ejection hole to apply uniform thrust to the plastic part, so that most of the plastic part is ejected out, and the defect that a traditional ejection mechanism possibly causes local damage and deformation of the surface of the plastic part and affects the yield of workpieces is overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an ejection mechanism of an injection mold. Background Technique

[0002] An injection mold is a tool for producing plastic products; it is also a tool for endowing plastic products with a complete structure and precise dimensions. Injection molding is a processing method used when mass-producing some parts with complex shapes. Specifically, the heated and melted plastic is injected into the mold cavity by a high pressure of an injection molding machine. After cooling and solidifying, a molded product is obtained. When the injection molding is completed, the finished product needs to be ejected by an ejection mechanism.

[0003] Most of the existing demolding and ejection mechanisms eject plastic parts by designing multiple ejector rods. During demolding, the multiple ejector rods of the ejector rod ejection mechanism will directly contact the plastic parts, and the ejection force of the ejector rods on the plastic parts is not uniform, which may cause local damage and deformation on the surface of the injection molded parts, affecting the yield of the workpiece.

[0004] Therefore, those skilled in the art provide an ejection mechanism of an injection mold to solve the problems raised in the above background technique. Content of the Utility Model

[0005] The purpose of the utility model is to solve the deficiencies existing in the prior art, and an ejection mechanism of an injection mold is proposed. The air pump compresses gas, and then the compressed gas is sent into the fixed cavity through an air pipe and an air flow channel. The compressed gas impacts the first ejector rod upward. At the same time, the first spring is compressed. Since the upward movement of the first ejector rod can not only slightly lift the middle part of the plastic part, but also make the first ejector rod no longer sealed with the ejection hole, and the gas sprays out from the ejection hole to apply a uniform thrust to the plastic part, thereby realizing the ejection work of most of the plastic parts, and solving the defect that the traditional ejection mechanism may cause local damage and deformation on the surface of the injection molded parts, affecting the yield of the workpiece.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] An ejection mechanism of an injection mold includes a first ejection mechanism, a second ejection mechanism, a bottom plate, an upper template, a lower template and four sliding rods. The four sliding rods are respectively fixedly installed at the four corner positions between the bottom plate and the upper template. The lower template is slidably sleeved at the outer ends of the four sliding rods. The first ejection mechanism is designed in the upper half of the lower template;

[0008] The first ejection mechanism includes a fixed cavity, an ejection hole, a first ejection rod, a first spring and an air pump. The fixed cavity is opened in the upper half of the inner part of the lower template. The ejection hole is opened at the upper end of the fixed cavity. An air flow channel is opened at the lower end of the fixed cavity. A connecting piece is fixedly arranged at the outlet end of the air flow channel. A trachea is connected between the connecting piece and the air outlet end of the air pump. The first ejection rod is slidably arranged inside the fixed cavity and the ejection hole. The first spring is sleeved on the lower half of the first ejection rod, and the two ends of the first spring are respectively fixedly connected with the upper end of the inner wall of the fixed cavity and the lower end of the first ejection rod;

[0009] Through the above technical solution, the air pump compresses the gas, and then the compressed gas is sent into the fixed cavity through the trachea and the air flow channel. The gas impacts the first ejection rod upward. At the same time, the first spring is compressed. Since the upward movement of the first ejection rod can not only slightly lift the middle part of the plastic part, but also make the first ejection rod no longer sealed with the ejection hole, and the gas sprays out from the ejection hole to exert a uniform thrust on the plastic part, so as to realize the ejection work of most of the plastic parts, and solve the defect that the traditional ejection mechanism may cause local damage and deformation on the surface of the injection molded part, affecting the yield of the workpiece.

[0010] Furthermore, the second ejection mechanism includes a fixed groove, a fixed plate, four second ejection rods, four electric control telescopic columns and a fixed column. The four electric control telescopic columns are respectively embedded at the four corner positions of the bottom plate. The fixed column is fixedly arranged at the middle part of one side of the bottom plate. The four second ejection rods are fixedly arranged at the four corners of the top end of the fixed plate;

[0011] Through the above technical solution, the design of the electric control telescopic column facilitates the control of the movement of the lower template, and the design of the fixed column facilitates the pushing of the fixed plate to move.

[0012] Furthermore, fixing rods are fixedly arranged at the four corners of the middle part of the fixed groove. The fixed plate is slidably sleeved on the outer ends of the four fixing rods. The outer ends of the four fixing rods are all sleeved with second springs. The two ends of each second spring are respectively connected with the top end of the fixed plate and the inner top end of the fixed groove;

[0013] Through the above technical solution, the design of the fixing rods facilitates the limitation of the fixed plate, and the design of the second springs facilitates the reset of the fixed plate.

[0014] Furthermore, a through hole is opened at the middle part of the bottom end of the lower template and communicated with the fixed groove. The diameter of the through hole is the same as that of the fixed column;

[0015] Through the above technical solution, a through hole is opened at the middle part of the bottom end of the lower template and communicated with the fixed groove, and the diameter of the through hole is the same as that of the fixed column, so as to facilitate the fixed column to pass through the lower template.

[0016] Furthermore, an injection hole is provided in the middle of the upper template, and a mold cavity is provided at the top end of the lower template;

[0017] Through the above technical solution, an injection hole is provided in the middle of the upper template, and a mold cavity is provided at the top end of the lower template, which is convenient for injection molding.

[0018] Furthermore, a fixed seat is fixedly provided in the middle of the bottom end of the fixing plate, and the outer diameter of the fixed seat is the same as the size of the fixed column;

[0019] Through the above technical solution, a fixed seat is fixedly provided in the middle of the bottom end of the fixing plate, and the outer diameter of the fixed seat is the same as the size of the fixed column, which is convenient for protecting the fixing plate and reducing wear.

[0020] Furthermore, the top end of the first ejector rod is designed as a frustum of a cone, and the top end of the first ejector rod is in close fit with the ejection hole;

[0021] Through the above technical solution, the top end of the first ejector rod is designed as a frustum of a cone to reduce the contact stress by increasing the contact area, and the top end of the first ejector rod is in close fit with the ejection hole to avoid affecting the injection molding process.

[0022] Furthermore, the first spring is sleeved on the lower half of the first ejector rod, and both ends of the first spring are fixedly connected to the upper end of the inner wall of the fixed cavity and the lower end of the first ejector rod respectively;

[0023] Through the above technical solution, the design of the first spring facilitates the reset of the ejector rod.

[0024] The utility model has the following beneficial effects:

[0025] 1. An ejection mechanism for an injection mold proposed by the utility model compresses gas through an air pump, and then sends the compressed gas into the fixed cavity through an air pipe and an air flow channel. The compressed gas impacts the first ejector rod upward. At the same time, the first spring is compressed. Since the upward movement of the first ejector rod can not only slightly lift the middle part of the plastic part, but also make the first ejector rod no longer sealed with the ejection hole, and the gas sprays out from the ejection hole to exert a uniform thrust on the plastic part, thereby realizing the ejection of most of the plastic parts. This solves the defect that the traditional ejection mechanism may cause local damage and deformation on the surface of the injection molded part, affecting the yield of the workpiece.

[0026] 2. An ejection mechanism for an injection mold proposed by the utility model, after injection molding is completed, the lower template is pulled to move by shrinking the electric control telescopic column. When the fixed column passes through the through hole and pushes the fixing plate to move, the ejector rod will move together with the fixing plate to perform secondary ejection on the plastic part ejected by the air pump. At this time, the plastic part has been separated from the mold cavity. The secondary ejection of the ejector rod will not only cause damage to the surface of the plastic part, but also realize the process of rapid ejection and falling off, greatly improving the processing efficiency. Brief Description of the Drawings

[0027] Figure 1 Isometric view of an ejection mechanism of an injection mold proposed by the present utility model;

[0028] Figure 2 Cross-sectional view of the first ejection mechanism of an ejection mechanism of an injection mold proposed by the present utility model;

[0029] Figure 3 Cross-sectional view of the second ejection mechanism of an ejection mechanism of an injection mold proposed by the present utility model;

[0030] Figure 4 Front view of an ejection mechanism of an injection mold proposed by the present utility model;

[0031] Figure 5 Of an ejection mechanism of an injection mold proposed by the present utility model Figure 2 Enlarged view of part A.

[0032] Legend:

[0033] 1. First ejection mechanism; 101. Fixed cavity; 102. Air flow channel; 103. Ejection hole; 104. First ejection rod; 105. First spring; 106. Connector; 107. Air pipe; 108. Air pump; 2. Second ejection mechanism; 201. Fixed groove; 202. Fixed plate; 203. Second ejection rod; 204. Fixed rod; 205. Second spring; 206. Fixed column; 207. Through hole; 208. Fixed seat; 209. Electrically controlled telescopic column; 3. Bottom plate; 4. Upper template; 5. Slide bar; 6. Lower template; 7. Injection hole; 8. Mold cavity. Detailed Description of the Preferred Embodiment

[0034] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0035] Referring to Figure 1 , Figure 2 , Figure 5 , an embodiment provided by the present utility model: An ejection mechanism of an injection mold includes a first ejection mechanism 1, a second ejection mechanism 2, a bottom plate 3, an upper template 4, a lower template 6, and four slide bars 5. The four slide bars 5 are respectively fixedly installed at the four corner positions between the bottom plate 3 and the upper template 4. The lower template 6 is slidably sleeved on the outer ends of the four slide bars 5. The first ejection mechanism 1 is designed in the upper half inside the lower template 6;

[0036] The first ejecting mechanism 1 includes a fixed cavity 101, an ejection hole 103, a first ejecting rod 104, a first spring 105 and an air pump 108. The fixed cavity 101 is opened in the upper half inside the lower template 6. The ejection hole 103 is opened at the upper end of the fixed cavity 101. An air flow channel 102 is opened at the lower end of the fixed cavity 101. A connecting piece 106 is fixedly arranged at the outlet end of the air flow channel 102. A trachea 107 is connected between the connecting piece 106 and the air outlet end of the air pump 108. The first ejecting rod 104 is slidably arranged inside the fixed cavity 101 and the ejection hole 103. The first spring 105 is sleeved on the lower half of the first ejecting rod 104. The two ends of the first spring 105 are respectively fixedly connected to the upper end of the inner wall of the fixed cavity 101 and the lower end of the first ejecting rod 104. An injection hole 7 is opened in the middle of the upper template 4. A mold cavity 8 is opened at the top of the lower template 6. The top end of the first ejecting rod 104 is designed as a frustum of a cone, and the top end of the first ejecting rod 104 is in close fit with the ejection hole 103.

[0037] The air pump compresses gas, and then the compressed gas is sent into the fixed cavity 101 through the trachea 107 and the air flow channel 102. The compressed gas impacts the first ejecting rod 104 upward. At the same time, the first spring 105 is compressed. Since the upward movement of the first ejecting rod 104 can not only slightly lift the middle part of the plastic part, but also make the first ejecting rod 104 no longer sealed with the ejection hole 103, the gas sprays out from the ejection hole 103 to apply a uniform thrust to the plastic part, thereby realizing the majority of the ejecting work of the plastic part, solving the defect that the traditional ejecting mechanism may cause local damage and deformation on the surface of the injection molded part, affecting the yield of the workpiece. The design of the first spring 105 facilitates the reset of the ejecting rod. The top end of the first ejecting rod 104 is designed as a frustum of a cone, reducing the contact stress by increasing the contact area. And the close fit between the top end of the first ejecting rod 104 and the ejection hole 103 can avoid affecting the injection molding process. The injection hole 7 is opened in the middle of the upper template 4, and the mold cavity 8 is opened at the top of the lower template 6, which is convenient for injection molding processing.

[0038] Refer to Figure 1 、 Figure 3 、 Figure 4, an embodiment provided by the present utility model: The second ejection mechanism 2 includes a fixing groove 201, a fixing plate 202, four second ejection rods 203, four electric control telescopic columns 209 and a fixing column 206. The four electric control telescopic columns 209 are respectively embedded at the four corner positions of the bottom plate 3. The fixing column 206 is fixedly arranged in the middle of one side of the bottom plate 3. The four second ejection rods 203 are fixedly arranged at the four corners of the top end of the fixing plate 202. Fixing rods 204 are fixedly arranged at the four corners of the middle part of the fixing groove 201. The fixing plate 202 is slidably sleeved on the outer ends of the four fixing rods 204. Second springs 205 are sleeved on the outer ends of the four fixing rods 204. The two ends of each second spring 205 are respectively connected to the top end of the fixing plate 202 and the inner top end of the fixing groove 201. A through hole 207 is communicated and opened at the middle part of the bottom end of the lower template 6. The diameter of the through hole 207 is the same as that of the fixing column 206. A fixing seat 208 is fixedly arranged at the middle part of the bottom end of the fixing plate 202. The outer diameter of the fixing seat 208 is the same as the size of the fixing column 206;

[0039] The design of the electric control telescopic column 209 facilitates the control of the movement of the lower template 6, and the design of the fixing column 206 facilitates the pushing of the fixing plate 202 to move. The design of the fixing rod 204 facilitates the limiting of the fixing plate 202, and the design of the second spring 205 facilitates the reset of the fixing plate 202. A through hole 207 is communicated and opened at the middle part of the bottom end of the lower template 6. The diameter of the through hole 207 is the same as that of the fixing column 206, so as to facilitate the fixing column 206 to pass through the lower template 6. A fixing seat 208 is fixedly arranged at the middle part of the bottom end of the fixing plate 202. The outer diameter of the fixing seat 208 is the same as the size of the fixing column 206, which facilitates the protection of the fixing plate 202 and reduces wear.

[0040] Working principle: The air pump 108 compresses the gas, and then the compressed gas is sent into the fixed cavity 101 through the air pipe 107 and the air flow channel 102. The gas impacts the first ejection rod 104 upward. At the same time, the first spring 105 is compressed. Since the upward movement of the first ejection rod 104 can not only slightly lift the middle part of the plastic part, but also make the first ejection rod 104 no longer sealed with the ejection hole 103, and the gas sprays out from the ejection hole 103 to apply a uniform thrust to the plastic part, so as to realize the ejection work of most of the plastic parts, solving the defect that the traditional ejection mechanism may cause local damage and deformation on the surface of the injection molded part, affecting the yield of the workpiece. After the injection molding is completed, the electric control telescopic column 209 is contracted to pull the lower template 6 to move. When the fixing column 206 passes through the through hole 207 and pushes the fixing plate 202 to move, the ejector rod will move together with the fixing plate 202 to perform secondary ejection on the plastic part ejected by the air pump 108. At this time, the plastic part has been separated from the mold cavity 8. The secondary ejection of the ejector rod will not cause damage to the surface of the plastic part, and can also realize the process of rapid ejection and falling off, greatly improving the processing efficiency.

[0041] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An injection mold ejection mechanism, comprising a first ejection mechanism (1), a second ejection mechanism (2), a bottom plate (3), an upper mold plate (4), a lower mold plate (6) and four slide bars (5), characterized in that: The four slide bars (5) are respectively fixedly mounted at the four corners between the bottom plate (3) and the upper template (4); the sliding sleeves of the lower template (6) are arranged at the outer ends of the four slide bars (5); and the first ejection mechanism (1) is designed in the upper half of the lower template (6); The first ejection mechanism (1) comprises a fixed cavity (101), an ejection hole (103), a first ejection rod (104), a first spring (105) and an air pump (108); the fixed cavity (101) is provided in the upper half of the interior of the lower template (6); the ejection hole (103) is provided at the upper end of the fixed cavity (101); an air flow channel (102) is provided at the lower end of the fixed cavity (101); a connecting piece (106) is fixedly provided at the outlet end of the air flow channel (102); an air pipe (107) is provided between the connecting piece (106) and the air outlet end of the air pump (108); and the first ejection rod (104) is slidably provided inside the fixed cavity (101) and the ejection hole (103).

2. The injection mold ejection mechanism according to claim 1, characterized in that: The second ejection mechanism (2) comprises a fixing groove (201), a fixing plate (202), four second ejection rods (203), four electrically controlled telescopic columns (209) and a fixing column (206); the four electrically controlled telescopic columns (209) are respectively inlaid at the four corners of the bottom plate (3); the fixing column (206) is fixedly arranged at the middle of one side of the bottom plate (3); and the four second ejection rods (203) are fixedly arranged at the four corners of the top end of the fixing plate (202).

3. The injection mold ejection mechanism according to claim 2, characterized in that: The four corners of the middle of the fixing groove (201) are fixedly provided with fixing rods (204), the fixing plate (202) is slidably sleeved on the outer ends of the four fixing rods (204), the outer ends of the four fixing rods (204) are sleeved with second springs (205), and the two ends of each second spring (205) are respectively connected to the top end of the fixing plate (202) and the inner top end of the fixing groove (201).

4. The injection mold ejection mechanism according to claim 1, characterized in that: A through hole (207) is provided in the middle of the bottom end of the lower template (6) and is connected to the fixing groove (201). The diameter of the through hole (207) is the same as that of the fixing column (206).

5. The injection mold ejection mechanism according to claim 1, characterized in that: An injection hole (7) is provided in the middle of the upper mold plate (4), and a mold cavity (8) is provided at the top of the lower mold plate (6).

6. The injection mold ejection mechanism according to claim 2, characterized in that: A fixing seat (208) is fixedly arranged at the middle of the bottom end of the fixing plate (202), and the outer diameter of the fixing seat (208) is the same as that of the fixing column (206).

7. The injection mold ejection mechanism according to claim 1, characterized in that: The top end of the first ejection rod (104) is designed to be a truncated cone, and the top end of the first ejection rod (104) is tightly fitted with the ejection hole (103).

8. The injection mold ejection mechanism according to claim 1, characterized in that: The first spring (105) is sleeved on the lower half of the first ejector rod (104), and the two ends of the first spring (105) are fixedly connected to the upper end of the inner wall of the fixed cavity (101) and the lower end of the first ejector rod (104) respectively.

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