Automatic ejection mechanism for injection mold

Abstract

The invention relates to the technical field of injection molds, in particular to an automatic ejection mechanism for an injection mold, which comprises a base, a supporting plate and a mounting plate are fixedly connected to the upper end of the base in front-back symmetry, a fixed mold seat is fixedly mounted at the upper end of the mounting plate, and guide columns are fixedly connected to the side, provided with a mold cavity, of the fixed mold seat in left-right symmetry; the ends, away from the fixed mold base, of the guide columns are fixedly connected with the supporting plate, the multiple guide columns are sleeved with a movable mold base in a front-back sliding mode, a hydraulic driving assembly is fixedly installed on the supporting plate, and the end of an inner rod of the hydraulic driving assembly is fixedly connected with the movable mold base. The mold has the beneficial effects that the movable mold base and the fixed mold base are opened, the driving mechanism drives the air guide assembly to move backwards, the sealing head slides into the circular cavity from the air outlet hole, an air outlet in the end of the telescopic air pipeline is separated from the inner wall of the circular cavity, and meanwhile the driving mechanism drives the air conveying mechanism to operate; and the gas transmission mechanism introduces gas into the gas guide assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molds, and specifically relates to an automatic ejection mechanism for an injection mold. Background Technique

[0002] An injection mold is a tool for producing plastic products. An injection mold is a component that gives plastic its shape and size during molding. Although the structure of the mold may vary in thousands of ways due to different plastic varieties and properties, the shapes and structures of plastic products, and the types of injection machines, etc., the basic structure is the same. Its structure usually consists of parts such as a molding part, a gating system, a guiding part, an ejection mechanism, a temperature control system, an exhaust system, and a supporting part.

[0003] The function of the ejection mechanism in an injection mold is to ensure that the plastic part is accurately ejected from the mold cavity or the core after injection molding. However, in the existing injection molds when demolding the plastic part, the ejection mechanism is an air ejection structure, a rod ejection structure, or a push plate ejection structure, and these ejection mechanisms all have some defects during use. For example, the ejection force of the air ejection structure is limited, and the ejected product needs to have a sufficient demolding draft angle; the rod ejection structure and the push plate ejection structure will cause uneven local stress on the product, and it is easy to leave obvious ejection marks on the surface of the product during the ejection process of the product, resulting in product deformation or damage.

[0004] The existing push plate ejection structure or rod ejection structure is mostly used in cooperation with the air ejection structure during use. The ideal ejection sequence is to first separate the product from the cavity by air ejection, and then eject the product by the push plate or the push rod. However, in actual use, if the timing control is improper, such as air ejection delay or the push plate moving too early, it may cause uneven local stress on the product and deformation, or the ejection is unbalanced and some areas of the product still adhere to the mold, resulting in product tearing and damage. The existing ejection mechanisms have defects such as high use cost, complex maintenance, and timing control, which affect the quality and efficiency of injection products and are not conducive to actual use. Summary of the Invention

[0005] The purpose of the present invention is to provide an automatic ejection mechanism for an injection mold to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the present invention provides the following technical solution: An automatic ejection mechanism for an injection mold, including a base, a support plate and a mounting plate are symmetrically and fixedly connected to the front and rear of the upper end of the base, a fixed mold base is fixedly installed on the upper end of the mounting plate, guide columns are symmetrically and fixedly connected to the left and right sides of the side of the fixed mold base where the mold cavity is opened, the end of the guide column far from the fixed mold base is fixedly connected to the support plate, a movable mold base is slidably sleeved on the front and rear of a plurality of guide columns, a hydraulic drive assembly is fixedly installed on the support plate, and the end of the inner rod of the hydraulic drive assembly is fixedly connected to the movable mold base; On the left and right sides of the fixed mold base, concave side brackets are symmetrically and fixedly installed. A driving mechanism is installed in each of the two concave side brackets. The two driving mechanisms are symmetrically distributed on both sides of the fixed mold base. One end of the driving mechanism is connected to the moving mold base. A pushing mechanism and an air pushing mechanism for demolding the product are installed at the rear side of the fixed mold base. An air conveying mechanism is installed at the rear side of the air pushing mechanism. The driving mechanism is used to drive the pushing mechanism, the air pushing mechanism, and the air conveying mechanism.

[0007] Preferably, the driving mechanism includes a limit box slidably installed front and rear inside the concave side bracket. One outer side of the limit box close to the moving mold base is fixedly connected with a sliding rod. A return spring is sleeved on the sliding rod. One end of the sliding rod away from the limit box penetrates through the side wall of the concave side bracket and extends to the outside. A driving gear plate is slidably installed front and rear inside the limit box. The upper end of the driving gear plate meshes with a transmission gear. The upper end of the transmission gear meshes with a transmission gear plate. The transmission gear is rotatably connected to the limit box through a rotating shaft. One end of the driving gear plate close to the sliding rod is fixedly installed with a connecting plate. The end of the connecting plate away from the driving gear plate sequentially passes through the limit box, the concave side bracket and extends to the outside. The end of the connecting plate away from the driving gear plate is fixedly connected with the side surface of the moving mold base, and the connecting plate is respectively slidably connected with the limit box and the concave side bracket.

[0008] Preferably, a positioning mechanism for locking it is installed on the lower side surface of the limit box. The positioning mechanism includes a concave seat fixedly installed on the lower side surface of the limit box. An L-shaped positioning seat is slidably installed left and right inside the concave seat. One end of the L-shaped positioning seat close to the concave side bracket penetrates through the concave seat. A positioning elastic sheet is installed between the other end of the L-shaped positioning seat and the concave seat. The positioning elastic sheet applies an elastic force to the L-shaped positioning seat. A positioning groove matching with one end of the L-shaped positioning seat is opened on the inner side wall of the concave side bracket. One end of the driving gear plate is fixedly installed with a pressing block. One end of the pressing block close to the L-shaped positioning seat is chamfered to form a pressing inclined surface.

[0009] Preferably, the pushing mechanism includes a demolding push plate installed in the mold cavity of the fixed mold base. A plurality of transmission push rods are inserted through the rear side surface of the demolding push plate. One end of the transmission push rod away from the demolding push plate penetrates through the fixed mold base backward and extends to the outside. The transmission push rod is slidably connected with the fixed mold base front and rear. A circular cavity is opened inward at one end of the transmission push rod away from the demolding push plate. An air outlet hole is opened inward at the other end of the demolding push plate. The air outlet hole is communicated with the circular cavity. One ends of a plurality of transmission push rods away from the demolding push plate are jointly connected with a return frame. The return frame is fixedly sleeved on the transmission push rod. First cross plates are symmetrically and fixedly connected to the left and right sides of the return frame. One end of the first cross plate away from the return frame passes through the concave side bracket and is fixedly connected with the side surface of the limit box. The air pushing mechanism is arranged at the rear side of the return frame.

[0010] Preferably, a limiting groove is formed in the side surface of the concave side bracket, one end of the first cross plate away from the looped frame penetrates through the limiting groove, and the first cross plate is slidably connected to the limiting groove in the front and back directions.

[0011] Preferably, the air pushing mechanism includes an air pushing plate arranged at the rear side of the looped frame. Symmetrically and fixedly connected to the left and right sides of the air pushing plate are second cross plates. One end of each second cross plate away from the air pushing plate sequentially passes through the side surfaces of the concave side bracket and the limiting box and extends into the inner cavity of the limiting box. One end of the second cross plate away from the air pushing plate is fixedly connected to a transmission gear plate. A guiding transverse groove is formed in the side surface of the concave side bracket. A communicating transverse groove is formed in one side of the limiting box close to the guiding transverse groove. The communicating transverse groove and the guiding transverse groove are aligned and distributed, and the length of the guiding transverse groove is greater than that of the communicating transverse groove. One end of the second cross plate sequentially passes through the guiding transverse groove and the communicating transverse groove, and the second cross plate is slidably connected to the guiding transverse groove and the communicating transverse groove in the front and back directions respectively; A plurality of through holes are symmetrically formed in the left and right sides of the side surface of the air pushing plate. Symmetrically and fixedly connected to the left and right sides of the side of the air pushing plate close to the looped frame are a plurality of annular seats. Each annular seat is arranged outside one through hole. Two sector guiding grooves are formed in an annular array on the inner side of the annular seat. The front and rear ends of the sector guiding grooves penetrate through the front and rear sides of the annular seat. Two sector docking grooves are formed in an annular array on the side of the annular seat close to the air pushing plate. Each sector docking groove is communicated with the adjacent sector guiding groove. A gas guiding component is installed in the annular seat. One end of the gas guiding component extends into the circular cavity of the transmission push rod. The air conveying mechanism is installed on the side of the air pushing plate away from the looped frame.

[0012] Preferably, the gas guiding component includes a telescopic air pipeline that is slidably inserted in the front and back directions in the circular cavity of the transmission push rod. One end of the telescopic air pipeline close to the air pushing plate extends into the inner side of the annular seat, and one end of the telescopic air pipeline in the annular seat is open. One end of the telescopic air pipeline away from the air pushing plate is fixedly connected to a sealing head. A plurality of air outlet holes are formed in an annular array on the outer side of the sealing head at one end of the telescopic air pipeline away from the air pushing plate. One end of the air outlet hole close to the outer side is in sealed contact with the inner side wall of the circular cavity. The sealing head is inserted into the air outlet hole in a sealed manner. A sealing ring is arranged between the open end of the telescopic air pipeline and the through hole, and the inner cavity of the through hole is communicated with the inner cavity of the telescopic air pipeline. A filter element is installed in the inner cavity of the telescopic air pipeline. A sleeve is fixedly sleeved on the outer side of one end of the telescopic air pipeline in the annular seat. Two sector blocks are fixedly connected to the outer side of one end of the sleeve in the annular seat in an annular array. The two sector blocks are respectively clamped with the adjacent sector docking grooves.

[0013] Preferably, a contraction groove is formed in the inner side wall of each of the two sector docking grooves away from the air pushing plate. A locking component is installed in the contraction groove, and the locking component locks the gas guiding component; The locking assembly includes a clamping block slidably mounted in the contraction groove. One side of the clamping block away from the sector docking groove is fixedly connected to a pull rod. A locking spring is sleeved on the pull rod, and the two ends of the locking spring are respectively abutted against the clamping block and the contraction groove. One end of the pull rod away from the clamping block passes through the annular seat and extends to the outside. One end of the pull rod away from the clamping block is fixedly connected to a push head, and the pull rod is slidably connected to the annular seat. A clamping groove is formed on the side surface of the sector block. One end of the clamping block is clamped with the clamping groove. A pushing inclined surface is formed on one side of one end of the clamping block close to the sector guiding groove.

[0014] Preferably, the air delivery mechanism includes an air cylinder arranged on the side of the air push plate away from the return-shaped frame. The outer side surface of the air cylinder is symmetrically and fixedly provided with fixing plates. One end of the fixing plate is fixedly connected to the air push plate. The end of the air cylinder away from the air push plate is fixedly provided with an upper cover. A piston rod is movably inserted into the side surface of the upper cover. One end of the piston rod extends into the air cylinder. One end of the piston rod in the inner cavity of the air cylinder is fixedly provided with a piston head. The piston head is slidably connected to the front and back of the inner cavity of the air cylinder. One end of the piston rod away from the piston head is fixedly provided with a concave frame. The two ends of the concave frame respectively extend to the inner side through one side plate of the concave side bracket. The two ends of the concave frame are respectively fixedly connected to one side of two limit boxes. An air inlet hole is formed in the cylindrical surface of the air cylinder close to the air push plate. A first one-way valve is fixedly installed in the air inlet hole. One end of the first one-way valve is provided with an air inlet hose. An air exhaust hole is formed in the air cylinder close to the air push plate. A second one-way valve is fixedly installed in the air exhaust hole. One end of the second one-way valve is fixedly provided with a T-shaped pipe. The other two ends of the T-shaped pipe are both symmetrically and fixedly provided with connecting elbows. One end of the connecting elbow away from the T-shaped pipe is fixedly inserted into the through hole of the air push plate, and the connecting elbow is communicated with the through hole.

[0015] Preferably, a groove is formed on one side plate of the concave side bracket. One end of the concave frame penetrates through the groove. The concave frame is slidably connected to the concave side bracket in the front and back directions. The air inlet end of the first one-way valve is connected to the air inlet hose, and the air outlet end of the second one-way valve is connected to the T-shaped pipe.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The structure of the present invention is reasonably arranged and has strong functionality, with the following advantages: 1. When demolding operation is required, the moving mold base and the fixed mold base are separated. The driving mechanism drives the air guiding assembly to move backward, so that the sealing head slides from the air outlet hole into the circular cavity, and the air outlet of the end of the telescopic air pipeline is separated from the inner wall of the circular cavity. At the same time, the driving mechanism drives the air delivery mechanism to operate, so that the air delivery mechanism introduces gas into the air guiding assembly, and the air guiding assembly conveys the gas into the mold cavity of the fixed mold base, thereby separating the product from the inner wall of the mold cavity.

[0017] 2. The filter element can filter the gas blown into the mold cavity well, preventing impurities from clogging the air outlet and air holes, and at the same time preventing impurities from adhering to the outside of the product, which affects the quality of the product. The top-pushing mechanism, air-pushing mechanism and air guiding component are all detachably connected, which is convenient for later replacement and maintenance. When a certain component is damaged, only the damaged component needs to be replaced, which greatly saves the maintenance cost.

[0018] 3. After the driving tooth plate in the driving mechanism moves forward a certain distance, the positioning mechanism is loosened from locking the limit box through the arranged extrusion block. When one end of the driving tooth plate contacts the inner wall of the limit box, the driving tooth plate drives the limit box to move forward. When the limit box moves forward, it drives the return frame to move closer to the fixed mold base through the first cross plate. The return frame drives the transmission push rod to insert into the fixed mold base, and at the same time the transmission push rod drives the demoulding push plate to move out along the mold cavity of the fixed mold base, so as to push out the product in the mold cavity and complete the demoulding operation.

[0019] 4. When it is necessary to close the moving mold base and the fixed mold base, the inner rod of the hydraulic driving component extends out, so that the moving mold base moves closer to the fixed mold base for closing. Under the action of the elastic force of the return spring, the limit box is reset, and at the same time the ejecting mechanism is reset to wait for the next injection molding and demoulding. Then the driving mechanism is reset, and at the same time the driving mechanism drives the air guiding component to insert into the circular cavity of the transmission push rod, so as to be reset. At the same time, the driving mechanism drives the air conveying mechanism to reset. At this time, a negative pressure is formed in the inner cavity of the air cylinder to inhale air, and the gas flows into the inner cavity of the air cylinder along the air inlet hose and the first one-way valve, so as to fill the inner cavity of the air cylinder with gas and wait for the next demoulding operation. Description of the Drawings

[0020] Figure 1 is a three-dimensional view of the automatic ejecting mechanism for the injection mold of the present invention; Figure 2 is a cross-sectional view of a partial structure of the automatic ejecting mechanism for the injection mold of the present invention; Figure 3 is Figure 2 a schematic enlarged view of the structure at A in Figure 4 is Figure 2 a schematic enlarged view of the structure at B in Figure 5 is a schematic diagram of the driving mechanism, top-pushing mechanism and air conveying mechanism of the present invention; Figure 6 is a cross-sectional view of the concave side bracket, driving mechanism and positioning mechanism of the present invention; Figure 7 is an exploded view of the driving mechanism, top-pushing mechanism, air-pushing mechanism, air guiding component and air conveying mechanism of the present invention; Figure 8Exploded view of the concave side bracket, drive mechanism and positioning mechanism of the present invention; Figure 9 Exploded view of the transmission push rod, air push mechanism, air guide component and locking component of the present invention; Figure 10 Cross-sectional view of the annular seat structure of the present invention; Figure 11 Horizontal cross-sectional view of the air guide component and air delivery mechanism of the present invention.

[0021] In the figure: 1. Base; 11. Support plate; 12. Fixed mold base; 13. Guide pillar; 14. Moving mold base; 15. Hydraulic drive assembly; 2. Concave side bracket; 21. Guide horizontal groove; 22. Limit groove; 23. Positioning groove; 3. Limit box; 31. Connecting horizontal groove; 32. Slide bar; 33. Return spring; 4. Drive toothed plate; 41. Transmission gear; 42. Transmission toothed plate; 43. Extrusion block; 44. Concave seat; 45. L-shaped positioning seat; 46. Positioning elastic piece; 47. Connecting plate; 5. Demolding push plate; 51. Transmission push rod; 52. Air outlet hole; 53. Return frame; 54. First horizontal plate; 6. Air push plate; 61. Second horizontal plate; 62. Annular seat; 63. Sector guide groove; 64. Sector docking groove; 65. Shrinkage groove; 66. Block; 67. Pull rod; 68. Locking spring; 69. Push head; 7. Telescopic air pipeline; 71. Air outlet; 72. Sealing head; 73. Filter element; 74. Sleeve; 75. Sector block; 76. Card slot; 8. Air cylinder; 81. Fixed plate; 82. Upper cover; 83. Piston rod; 84. Piston head; 85. Concave frame; 86. First one-way valve; 9. Second one-way valve; 91. T-shaped pipeline; 92. Connecting elbow. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0023] Please refer to Figures 1 to 11 , the present invention provides a technical solution: an automatic ejection mechanism for an injection mold, including a base 1. The upper end of the base 1 is symmetrically and fixedly connected with support plates 11 and mounting plates before and after. The upper end of the mounting plate is fixedly installed with a fixed mold base 12. On the side of the fixed mold base 12 where the mold cavity is opened, guide pillars 13 are symmetrically and fixedly connected on the left and right. The end of the guide pillar 13 away from the fixed mold base 12 is fixedly connected with the support plate 11. A moving mold base 14 is slidably sleeved on the plurality of guide pillars 13 before and after. A hydraulic drive assembly 15 is fixedly installed on the support plate 11. The end of the inner rod of the hydraulic drive assembly 15 is fixedly connected with the moving mold base 14; On the left and right sides of the fixed mold base 12, concave side brackets 2 are symmetrically and fixedly installed. A driving mechanism is installed in each of the two concave side brackets 2. The two driving mechanisms are symmetrically distributed on both sides of the fixed mold base 12. One end of the driving mechanism is connected to the moving mold base 14. A pushing mechanism and an air pushing mechanism for demolding the product are installed at the rear side of the fixed mold base 12. An air conveying mechanism is installed at the rear side of the air pushing mechanism. The driving mechanism is used to drive the pushing mechanism, the air pushing mechanism and the air conveying mechanism, so that the air conveying mechanism first inputs air flow into the air pushing mechanism, and the air flow flows into the mold cavity of the fixed mold base 12 along the air pushing mechanism, so that the product is first separated from the inner wall of the mold cavity, and then the product is pushed out of the mold cavity by the pushing mechanism.

[0024] Through the arranged driving mechanism, every time the demolding operation is carried out, it can be ensured that the air pushing mechanism first separates the product from the inner wall of the mold cavity, and then the pushing mechanism pushes the product out of the mold cavity, which can effectively prevent the situation of product damage caused by improper timing control, such as air top delay or premature movement of the push plate, and ensure the injection quality and efficiency of the injection molded product.

[0025] The hydraulic driving component 15 can be set as a hydraulic cylinder, or can be replaced by an electric cylinder drive or driven by a motor, a lead screw and a sliding sleeve, etc. Through the contraction of the inner rod of the hydraulic driving component 15, the moving mold base 14 slides back and forth along the guide post 13, so that the moving mold base 14 moves away from the fixed mold base 12 to open the mold, or the moving mold base 14 moves close to the fixed mold base 12 to close the mold. At this time, the moving mold base 14 drives the driving mechanism to operate.

[0026] Please refer to Figure 2 、 Figure 5 、 Figure 6 and Figure 8 The driving mechanism includes a limit box 3 slidably installed inside the concave side bracket 2 in the front and rear directions. One outer side of the limit box 3 close to the moving mold base 14 is fixedly connected with a slide bar 32. A return spring 33 is sleeved on the slide bar 32. One end of the slide bar 32 far from the limit box 3 penetrates through the side wall of the concave side bracket 2 and extends to the outside, and the slide bar 32 is slidably connected with the side wall of the concave side bracket 2 in the front and rear directions; A driving gear plate 4 is slidably installed inside the limit box 3 in the front and rear directions. The upper end of the driving gear plate 4 is engaged with a transmission gear 41. The upper end of the transmission gear 41 is engaged with a transmission gear plate 42. The transmission gear 41 is rotationally connected to the limit box 3 through a rotating shaft. The transmission gear plate 42 is in sliding contact with the inner wall of the limit box 3. The driving gear plate 4 and the transmission gear plate 42 are circumferentially arranged outside the transmission gear 41. That is, the position of the transmission gear plate 42 is where the driving gear plate 4 rotates 180 degrees around the axis of the transmission gear 41. Since both the driving gear plate 4 and the transmission gear plate 42 are engaged with the transmission gear 41, when the driving gear plate 4 moves, the transmission gear plate 42 moves synchronously, and the moving directions of the driving gear plate 4 and the transmission gear plate 42 are opposite; One end of the driving tooth plate 4 close to the sliding rod 32 is fixedly installed with a connecting plate 47. One end of the connecting plate 47 away from the driving tooth plate 4 sequentially passes through the limiting box 3 and the concave side bracket 2 and extends to the outside. One end of the connecting plate 47 away from the driving tooth plate 4 is fixedly connected to the side surface of the moving die base 14, and the connecting plate 47 is respectively slidably connected to the limiting box 3 and the concave side bracket 2.

[0027] Two sliding rails can be installed on the inner wall of the limiting box 3, and sliders matching the sliding rails are respectively installed on the driving tooth plate 4 and the transmission tooth plate 42. The sliders slide back and forth along the sliding rails, so that the driving tooth plate 4 and the transmission tooth plate 42 can move back and forth stably.

[0028] When the moving die base 14 moves away from the fixed die base 12, the moving die base 14 drives the connecting plate 47 to move synchronously. The connecting plate 47 drives the driving tooth plate 4 to move, so that the driving tooth plate 4 moves close to the sliding rod 32. When the driving tooth plate 4 moves, it pushes the transmission gear 41 to rotate. Since both the driving tooth plate 4 and the transmission tooth plate 42 are engaged with the transmission gear 41, when the driving tooth plate 4 moves, the transmission tooth plate 42 moves synchronously, and the moving directions of the driving tooth plate 4 and the transmission tooth plate 42 are opposite; Therefore, when the driving tooth plate 4 moves close to the sliding rod 32, the transmission tooth plate 42 moves away from the sliding rod 32.

[0029] When the moving die base 14 moves close to the fixed die base 12, the connecting plate 47 drives the driving tooth plate 4 to move away from the sliding rod 32, so that the transmission tooth plate 42 moves close to the sliding rod 32.

[0030] Please refer to Figure 6 and Figure 8 As shown in, a positioning mechanism for locking it is installed on the lower side surface of the limiting box 3. The positioning mechanism includes a concave seat 44 fixedly installed on the lower side surface of the limiting box 3. An L-shaped positioning seat 45 is slidably installed left and right in the concave seat 44. One end of the L-shaped positioning seat 45 close to the concave side bracket 2 penetrates through the concave seat 44. A positioning elastic sheet 46 is installed between the other end of the L-shaped positioning seat 45 and the concave seat 44. The positioning elastic sheet 46 applies an elastic force to the L-shaped positioning seat 45. A positioning groove 23 matching one end of the L-shaped positioning seat 45 is opened on the inner side wall of the concave side bracket 2. One end of the driving tooth plate 4 is fixedly installed with an extrusion block 43. One end of the extrusion block 43 close to the L-shaped positioning seat 45 is chamfered to form an extrusion inclined surface.

[0031] When the moving die base 14 and the fixed die base 12 are clamped, one end of the L-shaped positioning seat 45 passes through the concave seat 44 and is clamped with the positioning groove 23; the limiting box 3 is locked through the arranged positioning mechanism. At this time, the connecting plate 47 drives the driving tooth plate 4 to move, and the limiting box 3 remains stationary, that is, the limiting box 3 and the concave side bracket 2 remain stationary relative to each other.

[0032] When the moving mold base 14 moves away from the fixed mold base 12, the connecting plate 47 drives the driving tooth plate 4 to move closer to the sliding rod 32, and the transmission tooth plate 42 moves away from the sliding rod 32. At the same time, the driving tooth plate 4 drives the extrusion block 43 to move closer to the L-shaped positioning seat 45, causing one end of the L-shaped positioning seat 45 to contract into the concave seat 44. At the same time, the L-shaped positioning seat 45 presses the positioning elastic piece 46; After the extrusion inclined surface of the extrusion block 43 contacts the L-shaped positioning seat 45, the driving tooth plate 4 drives the extrusion block 43 to continue moving closer to the sliding rod 32. At this time, the extrusion block 43 pushes the L-shaped positioning seat 45 to move away from the concave side bracket 2, causing one end of the L-shaped positioning seat 45 to move out of the positioning groove 23, so that the positioning mechanism releases the locking of the limit box 3; At this time, one end of the driving tooth plate 4 contacts the inner wall of the limit box 3. The moving mold base 14 continues to move away from the fixed mold base 12, causing the connecting plate 47 to drive the driving tooth plate 4 to move closer to the fixed mold base 12. At this time, the driving tooth plate 4 drives the limit box 3 to move synchronously closer to the fixed mold base 12. The limit box 3 drives the transmission gear 41 and the transmission tooth plate 42 to move synchronously. The limit box 3 drives the sliding rod 32 to slide along the concave side bracket 2. At the same time, the limit box 3 compresses the return spring 33 until the moving mold base 14 and the fixed mold base 12 complete the mold opening, and the moving mold base 14 stops moving.

[0033] When the moving mold base 14 and the fixed mold base 12 are closed, the moving mold base 14 moves closer to the fixed mold base 12. The connecting plate 47 drives the driving tooth plate 4 to move away from the fixed mold base 12. Under the action of the elastic force of the return spring 33, it pushes the limit box 3 to move away from the fixed mold base 12, so that the driving tooth plate 4 and the limit box 3 move synchronously away from the fixed mold base 12; Until one end of the limit box 3 contacts an inner wall of the concave side bracket 2. At this time, one end of the L-shaped positioning seat 45 is aligned with the positioning groove 23. Under the action of the elastic force of the positioning elastic piece 46, one end of the L-shaped positioning seat 45 is clamped with the positioning groove 23, so that the positioning mechanism locks the limit box 3; At this time, the moving mold base 14 continues to move closer to the fixed mold base 12. The connecting plate 47 drives the driving tooth plate 4 to move away from the sliding rod 32, so that the transmission tooth plate 42 moves closer to the sliding rod 32, causing the driving tooth plate 4 and the transmission tooth plate 42 to be reset, waiting for the next demoulding operation.

[0034] Please refer to Figures 2 to 5 、 Figure 7, the pushing mechanism includes a demolding push plate 5 installed in the mold cavity of the fixed mold base 12. A plurality of transmission push rods 51 are inserted through the rear side of the demolding push plate 5. The front ends of the transmission push rods 51 are flush with the front side of the demolding push plate 5, and both are in the same vertical plane or the same horizontal plane. The transmission push rods 51 are fixedly connected to the demolding push plate 5. The end of the transmission push rod 51 away from the demolding push plate 5 penetrates through the fixed mold base 12 backward and extends to the outside. The transmission push rod 51 is slidably connected to the fixed mold base 12 in the front-back direction. A circular cavity is formed inwardly at the end of the transmission push rod 51 away from the demolding push plate 5. An air outlet hole 52 is formed inwardly at the other end of the demolding push plate 5. The air outlet hole 52 is communicated with the circular cavity. The ends of the plurality of transmission push rods 51 away from the demolding push plate 5 are commonly connected to a return frame 53. The return frame 53 is fixedly sleeved on the transmission push rod 51. First horizontal plates 54 are symmetrically and fixedly connected to the left and right sides of the return frame 53. The end of the first horizontal plate 54 away from the return frame 53 passes through the concave side bracket 2 and is fixedly connected to the side surface of the limit box 3. The air pushing mechanism is arranged at the rear side of the return frame 53.

[0035] A limit groove 22 is formed in the side surface of the concave side bracket 2. The end of the first horizontal plate 54 away from the return frame 53 penetrates through the limit groove 22, and the first horizontal plate 54 is slidably connected to the limit groove 22 in the front-back direction.

[0036] When the limit box 3 moves close to the fixed mold base 12, the limit box 3 drives the first horizontal plate 54 to move synchronously close to the fixed mold base 12. The first horizontal plate 54 slides along the limit groove 22. At the same time, the first horizontal plate 54 drives the return frame 53 to move close to the fixed mold base 12. The return frame 53 drives the transmission push rod 51 to insert into the fixed mold base 12. At the same time, the transmission push rod 51 drives the demolding push plate 5 to move outward along the mold cavity of the fixed mold base 12, so as to push out the product in the mold cavity and complete the demolding operation.

[0037] When the limit box 3 moves away from the fixed mold base 12, the return frame 53 is driven to move away from the fixed mold base 12 through the first horizontal plate 54. The return frame 53 drives the transmission push rod 51 to move out of the fixed mold base 12 outward. At the same time, the transmission push rod 51 drives the demolding push plate 5 to move inward along the mold cavity of the fixed mold base 12. When the limit box 3 stops, the demolding push plate 5 just moves to the bottom of the mold cavity, and the rear side surface of the demolding push plate 5 contacts the bottom of the mold cavity, so that the demolding push plate 5 is reset and waits for the next injection molding and demolding.

[0038] Please refer to Figures 2 to 4 、 Figures 9 to 11, the air-pushing mechanism includes an air-pushing plate 6 arranged at the rear side of the rectangular frame 53. Symmetrically and fixedly connected to the left and right sides of the air-pushing plate 6 are second cross plates 61. One end of each second cross plate 61 away from the air-pushing plate 6 sequentially passes through the side surfaces of the concave side brackets 2 and the limit box 3 and extends into the inner cavity of the limit box 3. One end of the second cross plate 61 away from the air-pushing plate 6 is fixedly connected to the transmission gear plate 42. A guiding transverse groove 21 is formed in the side surface of the concave side bracket 2, and a communicating transverse groove 31 is formed in the side of the limit box 3 close to the guiding transverse groove 21. The communicating transverse groove 31 and the guiding transverse groove 21 are aligned and distributed, and the length of the guiding transverse groove 21 is greater than that of the communicating transverse groove 31. One end of the second cross plate 61 sequentially passes through the guiding transverse groove 21 and the communicating transverse groove 31, and the second cross plate 61 is slidably connected to the guiding transverse groove 21 and the communicating transverse groove 31 in the front-back direction respectively; A plurality of through holes are symmetrically formed in the left and right sides of the side surface of the air-pushing plate 6. Symmetrically and fixedly connected to the left and right sides of the side of the air-pushing plate 6 close to the rectangular frame 53 are a plurality of annular seats 62. Each annular seat 62 is arranged outside a through hole, and the annular seat 62 and the adjacent through hole are coaxially distributed. Two sector guiding grooves 63 are formed in an annular array on the inner side of the annular seat 62. The front and rear ends of the sector guiding grooves 63 penetrate through the front and rear sides of the annular seat 62. Two sector docking grooves 64 are formed in an annular array on the side of the annular seat 62 close to the air-pushing plate 6. Each sector docking groove 64 is communicated with the adjacent sector guiding groove 63. An air guiding component is installed in the annular seat 62. One end of the air guiding component extends into the circular cavity of the transmission push rod 51. The air conveying mechanism is installed on the side of the air-pushing plate 6 away from the rectangular frame 53.

[0039] When the moving die base 14 moves away from the fixed die base 12, the transmission gear plate 42 moves away from the sliding rod 32. At this time, the transmission gear plate 42 drives the second cross plate 61 to slide backward along the guiding transverse groove 21 and the communicating transverse groove 31 respectively. At this time, the second cross plate 61 drives the air-pushing plate 6 to move backward synchronously. The air-pushing plate 6 drives the air guiding component to move backward through the annular seat 62, so that the air guiding component slides backward along the circular cavity of the transmission push rod 51, but the movement of the air guiding component is always not separated from the circular cavity, that is, the air guiding component will not completely slide out of the circular cavity.

[0040] When the moving die base 14 and the fixed die base 12 are clamped, the transmission gear plate 42 moves close to the sliding rod 32, so that the second cross plate 61 slides forward along the guiding transverse groove 21 and the communicating transverse groove 31 respectively. The air-pushing plate 6 drives the air guiding component to move forward through the annular seat 62, so that the air guiding component is inserted into the circular cavity of the transmission push rod 51 to perform resetting.

[0041] Please refer to Figure 2 、 Figure 4 、 Figure 9 and Figure 11, the air guiding assembly includes a telescopic air duct 7 that slides back and forth and is inserted into the circular cavity of the transmission push rod 51. One end of the telescopic air duct 7 close to the air push plate 6 extends to the inner side of the annular seat 62, and one end of the telescopic air duct 7 located within the annular seat 62 is open. A sealing head 72 is fixedly connected to the end of the telescopic air duct 7 away from the air push plate 6. A plurality of air outlets 71 are formed in an annular array on the outer side of the sealing head 72 at the end of the telescopic air duct 7 away from the air push plate 6. One end of the air outlet 71 close to the outer side is in sealing contact with the inner side wall of the circular cavity, thereby sealing the air outlet 71. The sealing head 72 is sealingly inserted into the air outlet hole 52. After the sealing head 72 is completely inserted into the air outlet hole 52, the end of the sealing head 72 and the end of the transmission push rod 51 are in the same vertical plane or the same horizontal plane. A sealing ring is provided between the open end of the telescopic air duct 7 and the through hole, and the inner cavity of the through hole is communicated with the inner cavity of the telescopic air duct 7. A filter element 73 is installed in the inner cavity of the telescopic air duct 7. A sleeve 74 is fixedly sleeved on the outer side of one end of the telescopic air duct 7 located within the annular seat 62. Two sector blocks 75 are fixedly connected in an annular array on the outer side of one end of the sleeve 74 located within the annular seat 62. The two sector blocks 75 are respectively clamped with the adjacent sector docking grooves 64.

[0042] When the air guiding assembly slides backward along the circular cavity of the transmission push rod 51, the telescopic air duct 7 slides backward along the circular cavity of the transmission push rod 51. At the same time, the sealing head 72 at the end of the telescopic air duct 7 slides from the air outlet hole 52 into the circular cavity, so that the sealing head 72 releases the sealing of the air outlet hole 52; At the same time, the air outlet 71 at the end of the telescopic air duct 7 is separated from the inner wall of the circular cavity, releasing the sealing of the air outlet 71. When the air flow flows into the inner cavity of the telescopic air duct 7, it then flows to the circular cavity along the air outlet 71, and finally flows to the mold cavity along the air outlet hole 52, so that the product in the mold cavity is separated from the inner wall of the mold cavity.

[0043] When the air guiding assembly moves forward, the telescopic air duct 7 slides forward along the circular cavity of the transmission push rod 51, so that the telescopic air duct 7 is inserted into the circular cavity of the transmission push rod 51. At the same time, the sealing head 72 at the end of the telescopic air duct 7 is inserted into the air outlet hole 52 until the end of the sealing head 72 is flush with the end of the transmission push rod 51, so that the sealing head 72 seals the air outlet hole 52; At the same time, the air outlet 71 at the end of the telescopic air duct 7 is in sealing contact with the inner wall of the circular cavity, sealing the air outlet 71, thereby resetting.

[0044] When installing the air guiding assembly, first insert the sleeve 74 into the annular seat 62, and the sleeve 74 drives one end of the telescopic air duct 7 and the filter element 73 to be inserted into the annular seat 62; Meanwhile, the sleeve 74 drives the two sector blocks 75 to be inserted along the two sector guide grooves 63 respectively. Until one side of the two sector blocks 75 contacts the air push plate 6, then rotate the sleeve 74 clockwise at this time. The sleeve 74 drives the two sector blocks 75 to rotate, so that the sector blocks 75 are snapped into the sector docking grooves 64; When it is necessary to disassemble the air guiding component, rotate the sleeve 74 counterclockwise. The sleeve 74 drives the sector block 75 to slide from the sector docking groove 64 into the sector guide groove 63. Then pull out one end of the sleeve 74, the telescopic air pipe 7 and the filter element 73 from the annular seat 62. At the same time, the sector block 75 slides outwards along the sector guide groove 63. At this time, the telescopic air pipe 7 and the filter element 73 can be cleaned or replaced and repaired.

[0045] The filter element 73 provided can filter the gas blown into the mold cavity well, prevent impurities from blocking the air outlet 71 and the air holes 52, and at the same time prevent impurities from adhering to the outside of the product, affecting the quality of the product.

[0046] The top pushing mechanism, the air pushing mechanism and the air guiding component are all detachably connected, which is convenient for later replacement and maintenance. And when a certain component is damaged, only the damaged component needs to be replaced, which greatly saves the maintenance cost.

[0047] Please refer to Figure 2 、 Figure 3 and Figure 9 , a contraction groove 65 is opened on one inner side wall of the two sector docking grooves 64 away from the air push plate 6. A locking component is installed in the contraction groove 65, and the locking component locks the air guiding component; The locking component includes a clamping block 66 slidably installed in the contraction groove 65. One side of the clamping block 66 away from the sector docking groove 64 is fixedly connected with a pull rod 67. A locking spring 68 is sleeved on the pull rod 67. The two ends of the locking spring 68 are respectively abutted against the clamping block 66 and the contraction groove 65. The locking spring 68 applies an elastic force to the clamping block 66. One end of the pull rod 67 away from the clamping block 66 passes through the annular seat 62 and extends to the outside. One end of the pull rod 67 away from the clamping block 66 is fixedly connected with a push head 69. The pull rod 67 is slidably connected with the annular seat 62; A clamping groove 76 is opened on the side surface of the sector block 75. One end of the clamping block 66 is clamped with the clamping groove 76. A pushing inclined surface is opened on one side of one end of the clamping block 66 close to the sector guide groove 63.

[0048] When the sector block 75 slides from the sector guide groove 63 into the sector docking groove 64, the sector block 75 first contacts the pushing inclined surface of the latch block 66. The sector block 75 continues to be inserted into the sector docking groove 64. At this time, the sector block 75 pushes the latch block 66 to contract into the contraction groove 65, and at the same time, the latch block 66 squeezes the locking spring 68. When the sector block 75 is completely inserted into the sector docking groove 64, the latch block 66 is aligned with the card slot 76. At this time, under the action of the elastic force of the locking spring 68, the latch block 66 is clamped with the card slot 76, so as to lock the sector block 75, making the sector block 75 unable to rotate out of the sector docking groove 64 at this time, firmly installing the sector block 75 in the annular seat 62, and further firmly connecting the sleeve 74 and the telescopic air pipeline 7 to the annular seat 62, without loosening or separating.

[0049] When it is necessary to disassemble the sleeve 74 and the telescopic air pipeline 7, push the two push heads 69 on one side of the annular seat 62 outwards, so that the push heads 69 are far away from the annular seat 62. At this time, the push heads 69 drive the latch block 66 to contract into the contraction groove 65 through the pull rod 67, so that the latch block 66 is removed from the card slot 76. At this time, the sleeve 74 can be rotated counterclockwise, so that the sector block 75 rotates from the sector docking groove 64 into the sector guide groove 63, so as to disassemble the sleeve 74 and the telescopic air pipeline 7 from the annular seat 62.

[0050] Please refer to Figure 1 、 Figure 2 、 Figure 5 、 Figure 7 and Figure 11 As shown in FIGS. One end of the cylindrical surface of the air cylinder 8 close to the air pushing plate 6 is provided with an air inlet hole, and a first one-way valve 86 is fixedly installed in the air inlet hole. One end of the first one-way valve 86 is provided with an air inlet hose. The end of the hose far from the first one-way valve 86 is connected to the air storage tank, or the end of the hose far from the first one-way valve 86 is directly communicated with the external air. One end of the air cylinder 8 close to the air pushing plate 6 is provided with an exhaust hole, and a second one-way valve 9 is fixedly installed in the exhaust hole. One end of the second one-way valve 9 is fixedly installed with a T-shaped pipe 91. The other two ends of the T-shaped pipe 91 are symmetrically and fixedly installed with connecting elbows 92. The end of the connecting elbow 92 far from the T-shaped pipe 91 is fixedly inserted into the through hole of the air pushing plate 6, and the connecting elbow 92 is communicated with the through hole.

[0051] The inner cavity of the air cylinder 8 is communicated with the inner cavity of the T-shaped pipe 91 through the second one-way valve 9. The inner cavity of the T-shaped pipe 91 is communicated with the inner cavity of the connecting elbow 92. The two ends of the T-shaped pipe 91 where the connecting elbows 92 are installed are sealed. The connecting elbows 92 are fixedly installed on the side wall of the T-shaped pipe 91. The connection between the connecting elbow 92 and the T-shaped pipe 91 is a fixed connection or a connection through a pipe joint.

[0052] A groove is provided on one side plate of the concave side bracket 2. One end of the concave frame 85 penetrates through the groove. The concave frame 85 is slidably connected to the concave side bracket 2 in the front and back directions. The air inlet end of the first one-way valve 86 is connected to the air inlet hose, and the air outlet end of the second one-way valve 9 is connected to the T-shaped pipe 91.

[0053] When the transmission gear plate 42 moves away from the sliding rod 32, the transmission gear plate 42 drives the air pushing plate 6 to move backward through the second cross plate 61. At this time, the limit box 3 remains stationary, so that the concave frame 85 remains stationary; When the air pushing plate 6 moves backward, it drives the air cylinder 8 to move backward through the fixing plate 81. At this time, the air cylinder 8 slowly approaches the concave frame 85, the air cylinder 8 slowly sleeves on the piston rod 83, and at the same time, the piston head 84 slides toward the bottom of the inner cavity of the air cylinder 8. At this time, the piston head 84 squeezes out the gas in the inner cavity of the air cylinder 8; The gas flows along the second one-way valve 9 into the inner cavity of the T-shaped pipe 91, flows along the inner cavity of the T-shaped pipe 91 to the inner cavity of the connecting elbow 92, and then flows along the inner cavity of the connecting elbow 92 into the through hole; The gas flows into the inner cavity of the telescopic air pipe 7 along the through hole, then flows to the circular cavity along the air outlet 71, and finally flows to the mold cavity along the air outlet hole 52, so as to separate the product in the mold cavity from the inner wall of the mold cavity.

[0054] By arranging the air delivery mechanism to introduce gas into the air guiding component, and the air guiding component conveys the gas to the mold cavity of the fixed mold base 12, so as to separate the product from the inner wall of the mold cavity.

[0055] When the limit box 3 moves forward, the limit box 3 drives the transmission gear plate 42 and the concave frame 85 to move forward synchronously. At this time, the air delivery mechanism, the air guiding assembly, and the pushing mechanism move forward synchronously, causing the demolding push plate 5 to move outwards along the mold cavity of the fixed mold base 12, thereby pushing out the product in the mold cavity and completing the demolding operation.

[0056] When the limit box 3 moves backward, the air delivery mechanism, the air guiding assembly, and the pushing mechanism move backward synchronously. The demolding push plate 5 moves inwards along the mold cavity of the fixed mold base 12. When the limit box 3 stops, the demolding push plate 5 just moves to the bottom of the mold cavity, and the rear side of the demolding push plate 5 contacts the bottom of the mold cavity, causing the demolding push plate 5 to complete the reset and wait for the next injection molding and demolding.

[0057] When the transmission gear plate 42 moves closer to the sliding rod 32, the second cross plate 61 drives the air push plate 6 to move forward. The air push plate 6 drives the air guiding assembly to move forward through the annular seat 62, causing the air guiding assembly to insert into the circular cavity of the transmission push rod 51, thereby performing the reset. When the air push plate 6 moves forward, it drives the air cylinder 8 to move forward. The air cylinder 8 moves away from the concave frame 85. At this time, the air cylinder 8 slowly moves away from the piston rod 83. At the same time, the piston head 84 moves closer to the upper cover 82 along the inner cavity of the air cylinder 8. At this time, a negative pressure is formed in the inner cavity of the air cylinder 8 to suck air, and the gas flows into the inner cavity of the air cylinder 8 along the intake hose and the first one-way valve 86, thereby filling the inner cavity of the air cylinder 8 with gas and waiting for the next demolding operation.

[0058] The side of the fixed mold base 12 with the mold cavity is defined as the front side, and the side away from the mold cavity is defined as the rear side.

[0059] Working principle: During operation, after the moving mold base 14 and the fixed mold base 12 are clamped, injection molding is carried out in the mold cavity. When demolding is required, the moving mold base 14 and the fixed mold base 12 are opened. By the contraction of the inner rod of the hydraulic drive assembly 15, the moving mold base 14 moves away from the fixed mold base 12 to open the mold. The moving mold base 14 drives the drive gear plate 4 to move closer to the sliding rod 32 through the connecting plate 47, causing the transmission gear plate 42 to move away from the sliding rod 32. The transmission gear plate 42 drives the air push plate 6 to move backward through the second cross plate 61. The air push plate 6 drives the air guiding assembly to move backward through the annular seat 62, causing the air guiding assembly to slide backward along the circular cavity of the transmission push rod 51. At the same time, the sealing head 72 at the end of the telescopic air pipe 7 slides from the air outlet hole 52 into the circular cavity, causing the sealing head 72 to release the sealing of the air outlet hole 52, and the air outlet 71 at the end of the telescopic air pipe 7 is separated from the inner wall of the circular cavity, releasing the sealing of the air outlet 71. When the air push plate 6 moves backward, it drives the air cylinder 8 to move backward through the fixing plate 81. At this time, the piston head 84 slides towards the bottom of the inner cavity of the air cylinder 8, and the gas in the inner cavity of the air cylinder 8 is squeezed out by the piston head 84. The gas flows through the second one-way valve 9, the T-shaped pipe 91, and the connecting elbow 92 in sequence and flows into the through hole. The gas flows into the inner cavity of the telescopic air pipe 7 along the through hole, then flows to the circular cavity along the air outlet 71, and finally flows to the mold cavity along the air outlet hole 52, so as to separate the product in the mold cavity from the inner wall of the mold cavity.

[0060] Gas is introduced into the air guiding component through the provided air delivery mechanism, and the gas is transported to the mold cavity of the fixed mold base 12 through the air guiding component, so as to separate the product from the inner wall of the mold cavity. The filter element 73 provided can filter the gas blown into the mold cavity well, prevent impurities from blocking the air outlet 71 and the air outlet hole 52, and prevent impurities from adhering to the outside of the product, affecting the quality of the product. The top pushing mechanism, the air pushing mechanism and the air guiding component are all detachably connected, which is convenient for later replacement and maintenance. When a certain component is damaged, only the damaged component needs to be replaced, which greatly saves the maintenance cost.

[0061] After the driving toothed plate 4 moves forward a certain distance, the extrusion block 43 on the lower side of the driving toothed plate 4 contacts the L-shaped positioning seat 45. At this time, the driving toothed plate 4 drives the extrusion block 43 to continue moving forward, and the L-shaped positioning seat 45 is pushed by the extrusion block 43 to move away from the concave side bracket 2, so that one end of the L-shaped positioning seat 45 moves out of the positioning groove 23, so that the positioning mechanism releases the locking of the limit box 3. When one end of the driving toothed plate 4 contacts the inner wall of the limit box 3, when the moving mold base 14 continues to move away from the fixed mold base 12, the driving toothed plate 4 drives the limit box 3 to move synchronously closer to the fixed mold base 12, and the limit box 3 drives the transmission gear 41, the transmission toothed plate 42 and the concave frame 85 to move synchronously, so that the air delivery mechanism and the air guiding component move forward synchronously. The limit box 3 drives the sliding rod 32 to slide along the concave side bracket 2, and at the same time the limit box 3 compresses the return spring 33 until the moving mold base 14 and the fixed mold base 12 complete the mold opening, and the moving mold base 14 stops moving.

[0062] When the limit box 3 moves forward, it drives the return frame 53 to move closer to the fixed mold base 12 through the first cross plate 54. The return frame 53 drives the transmission push rod 51 to insert into the fixed mold base 12. At the same time, the transmission push rod 51 drives the demolding push plate 5 to move outwards along the mold cavity of the fixed mold base 12, so as to push out the product in the mold cavity and complete the demolding operation.

[0063] When it is necessary to close the moving mold base 14 and the fixed mold base 12, the inner rod of the hydraulic driving component 15 extends out, so that the moving mold base 14 moves closer to the fixed mold base 12 for mold closing. The connecting plate 47 drives the driving toothed plate 4 to move away from the fixed mold base 12, and under the action of the elastic force of the return spring 33, the limit box 3 is pushed to move away from the fixed mold base 12, so that the driving toothed plate 4 and the limit box 3 move away from the fixed mold base 12 synchronously. Until one end of the limit box 3 contacts with an inner wall of the concave side bracket 2. At this time, one end of the L-shaped positioning seat 45 aligns with the positioning groove 23. Under the action of the elastic force of the positioning elastic piece 46, one end of the L-shaped positioning seat 45 is clamped with the positioning groove 23, so that the positioning mechanism locks the limit box 3; During the process of the limit box 3 moving backward, it drives the ejecting mechanism to move backward, so that the transmission push rod 51 drives the demolding push plate 5 to move inward along the mold cavity of the fixed mold base 12. The demolding push plate 5 just moves to the bottom of the mold cavity, and the rear side surface of the demolding push plate 5 contacts with the bottom of the mold cavity, so that the demolding push plate 5 is reset and waits for the next injection molding and demolding.

[0064] At this time, the moving mold base 14 continues to move closer to the fixed mold base 12. The connecting plate 47 drives the driving gear plate 4 to move away from the sliding rod 32, so that the transmission gear plate 42 moves closer to the sliding rod 32, and the driving gear plate 4 and the transmission gear plate 42 are reset; When the transmission gear plate 42 moves closer to the sliding rod 32, the second cross plate 61 drives the air push plate 6 to move forward. The air push plate 6 drives the air guide component to move forward through the annular seat 62, so that the air guide component is inserted into the circular cavity of the transmission push rod 51, and thus is reset; When the air push plate 6 moves forward, it drives the air cylinder 8 to move forward. The air cylinder 8 moves away from the concave frame 85. At this time, the air cylinder 8 slowly moves away from the piston rod 83. At the same time, the piston head 84 moves closer to the upper cover 82 along the inner cavity of the air cylinder 8. At this time, a negative pressure is formed in the inner cavity of the air cylinder 8 to suck air, and the air flows into the inner cavity of the air cylinder 8 along the air inlet hose and the first one-way valve 86, so that the inner cavity of the air cylinder 8 is filled with gas and waits for the next demolding operation.

[0065] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic ejection mechanism for an injection mold, comprising a base (1), characterized in that: The upper end of the base (1) is symmetrically fixedly connected to a support plate (11) and a mounting plate in front and back directions, a fixed die seat (12) is fixedly mounted on the upper end of the mounting plate, a guide column (13) is symmetrically fixedly connected to one side of the fixed die seat (12) where a die cavity is opened, an end of the guide column (13) away from the fixed die seat (12) is fixedly connected to the support plate (11), a plurality of guide columns (13) are slidably sleeved with a movable die seat (14) in front and back directions, a hydraulic drive assembly (15) is fixedly mounted on the support plate (11), and an end of an inner rod of the hydraulic drive assembly (15) is fixedly connected to the movable die seat (14); Concave side brackets (2) are symmetrically fixedly mounted on the left and right sides of the fixed mold base (12), and driving mechanisms are mounted in the two concave side brackets (2). The two driving mechanisms are symmetrically distributed on the left and right sides of the fixed mold base (12), and one end of the driving mechanism is connected to the movable mold base (14). A push mechanism and an air push mechanism for demoulding the product are mounted on the rear side of the fixed mold base (12), and an air delivery mechanism is mounted on the rear side of the air push mechanism. The driving mechanism is used to drive the push mechanism, the air push mechanism, and the air delivery mechanism.

2. The automatic ejection mechanism for an injection mold according to claim 1, wherein: The driving mechanism comprises a limit box (3) slidably mounted on the inner side of the concave side bracket (2) in a forward and backward manner, a slide rod (32) is fixedly connected to an outer side surface of the limit box (3) close to the movable mold base (14), a return spring (33) is sleeved on the slide rod (32), and an end of the slide rod (32) away from the limit box (3) passes through the side wall of the concave side bracket (2) and extends to the outside; A driving tooth plate (4) is slidably mounted in the limit box (3) in the front and rear directions. The upper end of the driving tooth plate (4) is meshed with a transmission gear (41). The upper end of the transmission gear (41) is meshed with a transmission tooth plate (42). The transmission gear (41) is rotatably connected to the limit box (3) via a rotating shaft. A connecting plate (47) is fixedly mounted on one end of the driving tooth plate (4) close to the slide bar (32). The end of the connecting plate (47) away from the driving tooth plate (4) passes through the limit box (3) and the concave side bracket (2) in sequence and extends to the outside. The end of the connecting plate (47) away from the driving tooth plate (4) is fixedly connected to the side surface of the movable mold base (14), and the connecting plate (47) is slidably connected to the limit box (3) and the concave side bracket (2) respectively.

3. The automatic ejection mechanism for an injection mold according to claim 2, characterized in that: The lower side of the limit box (3) is provided with a positioning mechanism for locking the limit box (3), the positioning mechanism comprising a concave seat (44) fixedly mounted on the lower side of the limit box (3), an L-shaped positioning seat (45) slidably mounted in the concave seat (44), one end of the L-shaped positioning seat (45) close to the concave side bracket (2) passes through the concave seat (44), a positioning spring sheet (46) is mounted between the other end of the L-shaped positioning seat (45) and the concave seat (44), the positioning spring sheet (46) applies elastic force to the L-shaped positioning seat (45), the inner side wall of the concave side bracket (2) is provided with a positioning groove (23) matching one end of the L-shaped positioning seat (45), and the lower end of the driving tooth plate (4) is fixedly mounted with an extrusion block (43), and one end of the extrusion block (43) close to the L-shaped positioning seat (45) is cut to form an extrusion inclined surface.

4. An automatic ejection mechanism for an injection mold according to claim 1, characterized in that: The pushing mechanism includes a demolding push plate (5) installed in the mold cavity of the fixed mold base (12). A plurality of transmission push rods (51) are inserted through the rear side of the demolding push plate (5). One end of the transmission push rod (51) away from the demolding push plate (5) penetrates through the fixed mold base (12) backward and extends to the outside. The transmission push rod (51) is slidably connected to the fixed mold base (12) in the front-back direction. A circular cavity is formed inwardly at one end of the transmission push rod (51) away from the demolding push plate (5). An air outlet hole (52) is formed inwardly at the other end of the demolding push plate (5). The air outlet hole (52) communicates with the circular cavity. One ends of the plurality of transmission push rods (51) away from the demolding push plate (5) are jointly connected to a return frame (53). The return frame (53) is fixedly sleeved on the transmission push rod (51). First horizontal plates (54) are symmetrically and fixedly connected to the left and right sides of the return frame (53). One end of the first horizontal plate (54) away from the return frame (53) passes through the concave side bracket (2) and is fixedly connected to the side surface of the limit box (3). The air pushing mechanism is arranged at the rear side of the return frame (53).

5. An automatic ejection mechanism for an injection mold according to claim 4, characterized in that: A limit groove (22) is formed in the side surface of the concave side bracket (2). One end of the first horizontal plate (54) away from the return frame (53) penetrates through the limit groove (22), and the first horizontal plate (54) is slidably connected to the limit groove (22) in the front-back direction.

6. The automatic ejection mechanism for an injection mold according to claim 4, wherein: The air pushing mechanism includes an air pushing plate (6) arranged at the rear side of the return frame (53). Second horizontal plates (61) are symmetrically and fixedly connected to the left and right sides of the air pushing plate (6). One end of the second horizontal plate (61) away from the air pushing plate (6) sequentially passes through the side surfaces of the concave side bracket (2) and the limit box (3) and extends into the inner cavity of the limit box (3). One end of the second horizontal plate (61) away from the air pushing plate (6) is fixedly connected to a transmission gear plate (42). A guiding horizontal groove (21) is formed in the side surface of the concave side bracket (2). A communicating horizontal groove (31) is formed in one side of the limit box (3) close to the guiding horizontal groove (21). The communicating horizontal groove (31) and the guiding horizontal groove (21) are arranged in alignment. The length of the guiding horizontal groove (21) is greater than that of the communicating horizontal groove (31). One end of the second horizontal plate (61) sequentially passes through the guiding horizontal groove (21) and the communicating horizontal groove (31), and the second horizontal plate (61) is slidably connected to the guiding horizontal groove (21) and the communicating horizontal groove (31) in the front-back direction respectively; On the left and right sides of the air push plate (6), a plurality of through holes are symmetrically and penetratingly formed. On the side of the air push plate (6) close to the return-shaped frame (53), a plurality of annular seats (62) are symmetrically and fixedly connected on the left and right. Each annular seat (62) is respectively arranged outside a through hole. On the inner side of the annular seat (62), two sector-shaped guide grooves (63) are formed in an annular array. The front and rear ends of the sector-shaped guide groove (63) penetrate through the front and rear sides of the annular seat (62). On the side of the annular seat (62) close to the air push plate (6), two sector-shaped docking grooves (64) are formed in an annular array. Each sector-shaped docking groove (64) is respectively communicated with the adjacent sector-shaped guide groove (63). An air guiding component is installed in the annular seat (62), and one end of the air guiding component extends into the circular cavity of the transmission push rod (51). The air conveying mechanism is installed on the side of the air push plate (6) away from the return-shaped frame (53).

7. An automatic ejection mechanism for an injection mold according to claim 6, characterized in that: The air guiding component includes a telescopic air pipeline (7) that is slidably inserted in the circular cavity of the transmission push rod (51) in the front and rear directions. One end of the telescopic air pipeline (7) close to the air push plate (6) extends into the inner side of the annular seat (62), and one end of the telescopic air pipeline (7) in the annular seat (62) is in an open shape. One end of the telescopic air pipeline (7) away from the air push plate (6) is fixedly connected with a sealing head (72). On the outer side of the sealing head (72) at one end of the telescopic air pipeline (7) away from the air push plate (6), a plurality of air outlet holes (71) are formed in an annular array. One end of the air outlet hole (71) close to the outer side is in sealed contact with the inner side wall of the circular cavity. The sealing head (72) is in sealed insertion with the air outlet hole (52). A sealing ring is provided between the open end of the telescopic air pipeline (7) and the through hole, and the inner cavity of the through hole is communicated with the inner cavity of the telescopic air pipeline (7). A filter element (73) is installed in the inner cavity of the telescopic air pipeline (7). On the outer side of one end of the telescopic air pipeline (7) in the annular seat (62), a sleeve (74) is fixedly sleeved. On the outer side of one end of the sleeve (74) in the annular seat (62), two sector-shaped blocks (75) are fixedly connected in an annular array. The two sector-shaped blocks (75) are respectively clamped with the adjacent sector-shaped docking grooves (64).

8. An automatic ejection mechanism for an injection mold according to claim 7, characterized in that: On one inner side wall of the two sector-shaped docking grooves (64) away from the air push plate (6), a contraction groove (65) is formed. A locking component is installed in the contraction groove (65), and the locking component locks the air guiding component; The locking component includes a clamping block (66) slidably installed in the contraction groove (65). On the side of the clamping block (66) away from the sector-shaped docking groove (64), a pull rod (67) is fixedly connected. A locking spring (68) is sleeved on the pull rod (67). The two ends of the locking spring (68) are respectively abutted against the clamping block (66) and the contraction groove (65). One end of the pull rod (67) away from the clamping block (66) passes through the annular seat (62) and extends to the outside. One end of the pull rod (67) away from the clamping block (66) is fixedly connected with a push head (69). The pull rod (67) is slidably connected with the annular seat (62); A clamping groove (76) is formed on the side surface of the sector block (75), one end of the clamping block (66) is clamped with the clamping groove (76), and a pushing inclined surface is formed on one end of the clamping block (66) close to one side of the sector guiding groove (63).

9. The automatic ejection mechanism for an injection mold according to claim 6, wherein: The air delivery mechanism includes an air cylinder (8) arranged on the side of the air pushing plate (6) away from the square frame (53). Symmetrically and fixedly installed on the outer side surface of the air cylinder (8) are fixing plates (81). One end of the fixing plate (81) is fixedly connected with the air pushing plate (6). The end of the air cylinder (8) away from the air pushing plate (6) is fixedly installed with an upper cover (82). A piston rod (83) is movably inserted into the side surface of the upper cover (82). One end of the piston rod (83) extends into the air cylinder (8). Fixedly installed at one end of the piston rod (83) inside the inner cavity of the air cylinder (8) is a piston head (84). The piston head (84) is slidably connected with the front and rear of the inner cavity of the air cylinder (8). Fixedly installed at the end of the piston rod (83) away from the piston head (84) is a concave frame (85). The two ends of the concave frame (85) respectively extend through a side plate of the concave side bracket (2) to its inner side. The two ends of the concave frame (85) are respectively fixedly connected with one side of two limit boxes (3). An air inlet hole is formed in the cylindrical surface of the air cylinder (8) close to the air pushing plate (6). A first one-way valve (86) is fixedly installed in the air inlet hole. An air inlet hose is installed at one end of the first one-way valve (86). An exhaust hole is formed in the air cylinder (8) close to the air pushing plate (6). A second one-way valve (9) is fixedly installed in the exhaust hole. A T-shaped pipe (91) is fixedly installed at one end of the second one-way valve (9). Symmetrically and fixedly installed at the other two ends of the T-shaped pipe (91) are connecting elbows (92). The end of the connecting elbow (92) away from the T-shaped pipe (91) is fixedly inserted into the through hole of the air pushing plate (6), and the connecting elbow (92) is communicated with the through hole.

10. An automatic ejection mechanism for an injection mold according to claim 9, characterized in that: A groove is formed in a side plate of the concave side bracket (2). One end of the concave frame (85) penetrates through the groove. The concave frame (85) is slidably connected with the concave side bracket (2) back and forth. The air inlet end of the first one-way valve (86) is connected with the air inlet hose. The air outlet end of the second one-way valve (9) is connected with the T-shaped pipe (91).

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