Center ejection device of engineering plastic retainer mold

Abstract

The utility model provides a center ejection device of an engineering plastic retainer mold. The center ejection device comprises a movable mold core, a movable mold core mounting plate, a movable mold plate and a center ejection device, the movable mold core, the movable mold core mounting plate and the movable mold plate are sequentially connected; a cold material well is arranged in one end, far away from the movable mold core mounting plate, of the movable mold core; the central ejection device comprises a central ejection rod, an exhaust core sleeve, a connection limiting assembly and an ejection rod; the central ejector rod comprises a central ejector rod head part and a central ejector rod tail part, the central ejector rod head part penetrates through the movable mold core and the internal cold material well, the central ejector rod tail part penetrates through the movable mold core mounting plate, and the ejector rod penetrates through the movable mold plate; the exhaust mold core sleeve is sleeved on the head part of the central ejector rod and is positioned in the movable mold core; the connecting and limiting assembly sleeves the tail part of the central ejector rod and is positioned in the movable mold core mounting plate, and the ejector rod is in contact with the central ejector rod; rapid exhaust of the mold can be achieved, meanwhile, the action requirement of center ejection is met, and circulation of a cooling oil way is taken into consideration.

Description

Technical Field

[0001] The utility model belongs to the field of precision injection mold design and application, in particular to a center ejection device for an engineering plastic retainer mold. Background Art

[0002] At present, the ejection of the material handle of the injection molding mold of engineering plastic retainer mostly adopts the same center ejector type as ordinary plastic products. The exhaust method is mainly to grind a 1mm exhaust groove. Moreover, the center material handle has no cooling system. The cooling of the material handle is driven by the cooling of the mold dynamic model core, and there is no cooling water channel in the cold well part.

[0003] Most existing injection molds utilize a Z-shaped ejector pin for their central ejection system. This traditional ejector pin has limited venting effectiveness and cannot incorporate a cooling system. The main material well cools the cold material via the balanced cooling of the moving mold core, resulting in slow heat conduction and poor cooling. If the cold material well is designed to be thick and deep, the cold material solidifies very slowly, affecting the quality properties of the material flow. A small amount of cold material may be carried into the product by the injection molding process, resulting in defective products. Furthermore, due to the high-pressure and high-speed filling of the material, the gas within the mold cavity cannot be quickly discharged to the outside of the mold through the venting grooves, causing the product to burn or be trapped, resulting in an underfilled product. Utility Model Content

[0004] In view of the above problems, the purpose of this application is to provide a center ejection device for an engineering plastic retainer mold. This device is assembled inside the mold core on the movable mold side of the injection mold and is connected to the movable mold plate. During the production process, this device can be used to achieve rapid exhaust of the mold, while realizing the action requirements of the center ejection and taking into account the circulation of the cooling oil circuit.

[0005] To achieve some or all of the above-mentioned objectives or other objectives, the present application provides the following technical solutions: a center ejection device for an engineering plastic retainer mold, comprising a dynamic mold core, a dynamic mold core mounting plate, a dynamic template and a center ejection device; the dynamic mold core, the dynamic mold core mounting plate and the dynamic template are connected in sequence, and a cold material well is provided in the end of the dynamic mold core away from the dynamic mold core mounting plate; the center ejection device comprises a center ejector rod, an exhaust core sleeve, a connection limit assembly and an ejector rod; the center ejector rod comprises a center ejector rod head and a center ejector rod tail, the center ejector rod head passes through the dynamic mold core and the internal cold material well, the center ejector rod tail passes through the dynamic mold core mounting plate, and the ejector rod passes through the dynamic template; the exhaust core sleeve is sleeved on the center ejector rod head and is located inside the dynamic mold core; the connection limit assembly is sleeved on the center ejector rod tail and is located inside the dynamic mold core mounting plate, and the ejector rod is in contact with the center ejector rod.

[0006] Furthermore, the center ejection device also includes a cooling jacket and a cooling plate; the cooling jacket is mounted on the exhaust core sleeve and the connection limit assembly, and is located inside the dynamic mold core and the dynamic mold core mounting plate, with one end of the cooling jacket close to the cold material well; the cooling plate is arranged inside the dynamic mold plate, the cooling plate is close to the dynamic mold core mounting plate, the ejector rod passes through the cooling plate, and an external mold temperature controller oil circuit matching the cooling jacket is provided inside the cooling plate.

[0007] Furthermore, the center push rod includes a conical locking mouth and a hollow straight rod, the diameter of the small circular end face of the conical locking mouth is equal to the diameter of the hollow straight rod, the conical locking mouth faces the cold material well, and several exhaust holes are respectively arranged near both ends of the hollow straight rod. One end of the hollow straight rod is connected to the conical locking mouth, and the other end of the hollow straight rod is provided with a thread.

[0008] Furthermore, the connection limit assembly includes a large gasket, a spring, a small gasket and a positioning screw; the large gasket, spring and small gasket are connected in sequence; the large gasket is sleeved on the hollow straight rod, and the large gasket is fixedly connected to the dynamic model core mounting plate; the spring is sleeved on the hollow straight rod and the positioning screw; the small gasket is sleeved on the positioning screw, and the small gasket is connected to the head of the positioning screw; the positioning screw is connected to one end of the hollow straight rod with a thread.

[0009] Furthermore, it also includes a bottom needle plate and an ejector column; one end of the ejector rod contacts the central ejector rod through a positioning screw, the other end of the ejector rod is connected to one side of the bottom needle plate, and the other side of the bottom needle plate is connected to the ejector column.

[0010] Furthermore, a conical groove matching the conical lock port is provided inside one end of the exhaust core sleeve, and an annular boss is provided outside the other end; an annular concave boss is provided inside the dynamic mold core, and the annular concave boss matches the annular boss.

[0011] Furthermore, a sealing ring is provided between the dynamic mold core mounting plate and the dynamic mold plate.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the present application is designed with dense exhaust holes at the upper and lower ends, and exhaust grooves and exhaust ducts are provided in the movable mold core and the movable mold core base plate, so that the gas inside the mold cavity can be discharged to the outside of the mold quickly and without resistance. A reset spring is provided on the center ejector rod, and the position is limited by a gasket, and the material flow is sealed by the conical lock design of the head. By using the oil cooling medium through the mold temperature controller, the mold temperature can be controlled more stably to achieve rapid cooling. The overall temperature of the mold has no temperature difference and is stable and balanced. The surrounding cooling jacket can make the temperature inside the movable mold tower core more balanced, solve the problem of slow heat dissipation caused by the thick material at the cold material well, effectively control the material flow and cold material, control the internal quality of the product from a process perspective, reduce the production of defective products, improve production efficiency, and increase the pass rate, ensuring stable and efficient mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the center ejection mechanism in the retracted state;

[0014] Figure 2 This is a schematic diagram of the ejection state of the center ejection mechanism;

[0015] Figure 3 This is the cross-sectional view of the center push rod;

[0016] Figure 4 Schematic diagram of the center push rod;

[0017] Figure 5 It is a schematic diagram of the exhaust core sleeve;

[0018] Figure 6 This is a schematic diagram of connecting the limit components;

[0019] Figure 7 Schematic diagram of the cooling plate;

[0020] Figure 8 This is the left view of the cooling plate;

[0021] Figure 9 A schematic diagram of connecting the limit assembly and the center push rod;

[0022] In the figure: 1. Center ejector pin; 1-1. Conical lock mouth; 1-2. Hollow straight rod; 1-3. Exhaust hole; 1-4. Thread; 2. Exhaust core sleeve; 2-1. Annular boss; 3. Large gasket; 4. Spring; 5. Small gasket; 6. Positioning screw; 7. Ejector pin; 8. Cooling jacket; 9. Bottom needle plate; 10. Ejector pin; 11. Cooling plate; 11-1. External mold temperature controller oil circuit; 12. Moving mold core; 12-1. Cold material well; 12-2. Annular recess; 13. Moving mold core mounting plate; 14. Moving mold plate. DETAILED DESCRIPTION

[0023] In order to make the structure and function of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0024] See attached Figure 1-3, a center ejection device for an engineering plastic retainer mold, comprising a dynamic model core 12, a dynamic model core mounting plate 13, a dynamic template 14 and a center ejection device; the dynamic model core 12, the dynamic model core mounting plate 13 and the dynamic template 14 are connected in sequence, and a cold material well 12-1 is provided in one end of the dynamic model core 12 away from the dynamic model core mounting plate 13; the center ejection device comprises a center ejector rod 1, an exhaust core sleeve 2, a connecting limit assembly and an ejector rod 7; the center ejector rod 1 comprises a center ejector rod 1 head and a center ejector rod 1 tail, the center ejector rod 1 head passes through the dynamic model core 12 and the internal cold material well 12-1, the center ejector rod 1 tail passes through the dynamic model core mounting plate 13, and the ejector rod 7 passes through the dynamic template 14; the exhaust core sleeve 2 is sleeved on the head of the center ejector rod 1 and is located inside the dynamic model core 12; the connecting limit assembly is sleeved on the tail of the center ejector rod 1 and is located inside the dynamic model core mounting plate 13, and the ejector rod 7 contacts the center ejector rod 1.

[0025] Furthermore, the center ejection device also includes a cooling sleeve 8 and a cooling plate 11; the cooling sleeve 8 is sleeved on the exhaust core sleeve 2 and the connecting limit assembly, and is located inside the dynamic model core 12 and the dynamic model core mounting plate 13, and one end of the cooling sleeve 8 is close to the cold material well 12-1; the cooling plate 11 is arranged inside the dynamic template 14, and the cooling plate 11 is close to the dynamic model core mounting plate 13. The ejector rod 7 passes through the cooling plate 11, and the cooling plate 11 is provided with an external mold temperature machine oil circuit 11-1 matching the cooling sleeve 8; a cooling water jacket is provided around the exhaust core in the dynamic model core of the mold, and is connected to the dynamic model core mounting plate and the dynamic template by a sealing ring, and is connected to the cooling plate provided in the dynamic template of the mold frame. The cooling plate is provided with a diversion pipe to achieve the effect that the ejection center rod passes through the center and is surrounded by cooling water, thereby achieving rapid cooling of the cold material well.

[0026] Furthermore, the center ejector rod 1 includes a tapered locking mouth 1-1 and a hollow straight rod 1-2. The diameter of the small circular end surface of the tapered locking mouth 1-1 is equal to the diameter of the hollow straight rod 1-2. The tapered locking mouth 1-1 faces the cold material well 12-1. A plurality of exhaust holes 1-3 are respectively provided on the hollow straight rod 1-2 near both ends. One end of the hollow straight rod 1-2 is connected to the tapered locking mouth 1-1, and the other end of the hollow straight rod 1-2 is provided with a thread 1-4. The tail of the center ejector rod device, The exhaust duct is connected to the exhaust hole and is connected to the exhaust duct on the cooling plate, so that the exhaust in the mold cavity can be quickly discharged from the exhaust duct to the outside of the mold; the upper and bottom ends of the center push rod are designed with exhaust holes with a diameter of 2mm, and there is an exhaust gap between the side and the exhaust core sleeve 2, so that the air inside the mold cavity can be quickly discharged to the outside of the mold; when injection molding, the material flow is pressurized on the head of the center push rod, causing it to retreat, and the conical lock mouth of the head is in close contact with the head of the exhaust core sleeve to form a sealing surface to seal the material flow.

[0027] Furthermore, the connection limit assembly includes a large gasket 3, a spring 4, a small gasket 5 and a positioning screw 6; the large gasket 3, spring 4 and small gasket 5 are connected in sequence; the large gasket 3 is sleeved on the hollow straight rod 1-2, and the large gasket 3 is fixedly connected to the dynamic model core mounting plate 13; the spring 4 is sleeved on the hollow straight rod 1-2 and the positioning screw 6; the small gasket 5 is sleeved on the positioning screw 6, and the small gasket 5 is connected to the head of the positioning screw 6; the positioning screw 6 is connected to the end of the hollow straight rod 1-2 with a thread.

[0028] Furthermore, it also includes a bottom needle plate 9 and an ejector column 10; one end of the ejector rod 7 contacts the center ejector rod 1 through a positioning screw 6, the other end of the ejector rod 7 is connected to one side of the bottom needle plate 9, and the other side of the bottom needle plate 9 is connected to the ejector column 10.

[0029] Furthermore, a conical groove matching the conical lock opening 1-1 is provided inside one end of the exhaust core sleeve 2, and an annular boss 2-1 is provided outside the other end; an annular recess 12-2 is provided inside the dynamic model core 12, and the annular recess 12-2 matches the annular boss 2-1.

[0030] Furthermore, a sealing ring is provided between the dynamic mold core mounting plate 13 and the dynamic mold plate 14 .

[0031] Furthermore, the center push rod is made of SKH51 material, the exhaust core sleeve 2, the dynamic model core 12 and the dynamic model core mounting plate 13 are made of SKD61 material, and the cooling sleeve 8 is made of copper alloy material; the dynamic model core and the dynamic model core mounting plate are made of SKD61 material by quenching, so that the material is hard, wear-resistant and corrosion-resistant, and the cooling system conducts heat quickly.

[0032] Furthermore, the ejection action of the center ejector is initiated by the ejector column of the injection molding machine, which pushes the bottom needle plate and drives the ejector pin forward. The ejector pin hits the positioning screw at the tail of the center ejector pin, and the center ejector pin moves forward. The large and small gaskets limit and compress the spring, causing the center ejector pin to protrude from the exhaust core sleeve, and the head of the center ejector pin leaks out. The gas in the mold is quickly discharged from the exhaust hole, completing the front ejection action.

[0033] Furthermore, as the center ejector retracts, the ejector column of the injection molding machine retreats, and the bottom needle plate of the mold also retreats, driving the ejector pin to retreat. The center ejector pin is acted upon by the spring rebound force, and also retreats into the exhaust core sleeve, where the conical surfaces of the heads meet, to achieve sealed material flow and complete the retreat action.

[0034] The tail of the integral center ejector is locked by a positioning screw, forming a contact with the ejector 7, and is driven forward and backward by the ejector column 10 of the injection molding machine. The ejector is driven by the bottom needle plate 9 to reciprocate back and forth. The positioning screw is pushed to reciprocate, and the movement process is reset by a spring. An annular cooling sleeve 8 is designed around the center ejector device to achieve mold cooling near the cold well. The entire center ejector device is installed in the dynamic model core 12, and is connected to the dynamic model core mounting plate 13 through a sealing ring and fixed, and then fixed together on the dynamic mold plate 14. The entire device achieves the effects of uniform cooling and centralized cooling of the cold well, while taking into account the ejection action of the center ejector and realizing the function of rapid exhaust during the injection molding process, achieving three goals in one go.

[0035] The above disclosure is only a preferred embodiment of the present application, and certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A center ejection device for an engineering plastic retainer mold, characterized by: It includes a dynamic mold core, a dynamic mold core mounting plate, a dynamic mold plate and a center ejection device; The dynamic model core, the dynamic model core mounting plate and the dynamic template are connected in sequence, and a cold material well is provided in the end of the dynamic model core away from the dynamic model core mounting plate; the central ejection device includes a central ejector rod, an exhaust core sleeve, a connection limit assembly and a ejector rod; the central ejector rod includes a central ejector rod head and a central ejector rod tail, the central ejector rod head passes through the dynamic model core and the internal cold material well, the central ejector rod tail passes through the dynamic model core mounting plate, and the ejector rod passes through the dynamic template; the exhaust core sleeve is sleeved on the central ejector rod head and is located inside the dynamic model core; the connection limit assembly is sleeved on the central ejector rod tail and is located inside the dynamic model core mounting plate, and the ejector rod is in contact with the central ejector rod.

2. The center ejection device of an engineering plastic retainer mold according to claim 1, characterized in that: The central ejection device also includes a cooling jacket and a cooling plate; the cooling jacket is mounted on the exhaust core sleeve and the connection limit assembly, and is located inside the dynamic mold core and the dynamic mold core mounting plate, with one end of the cooling jacket close to the cold material well; the cooling plate is close to the dynamic mold core mounting plate, the ejector rod passes through the cooling plate, and an external mold temperature controller oil circuit matching the cooling jacket is provided in the cooling plate.

3. The center ejection device of an engineering plastic retainer mold according to claim 1, characterized in that: The central push rod includes a conical locking mouth and a hollow straight rod. The diameter of the small circular end face of the conical locking mouth is equal to the diameter of the hollow straight rod. The conical locking mouth faces the cold material well. Several exhaust holes are respectively arranged near both ends of the hollow straight rod. One end of the hollow straight rod is connected to the conical locking mouth, and the other end of the hollow straight rod is provided with a thread.

4. The center ejection device of an engineering plastic retainer mold according to claim 3, characterized in that: The connection limit assembly includes a large gasket, a spring, a small gasket and a positioning screw; the large gasket, spring and small gasket are connected in sequence; the large gasket is sleeved on the hollow straight rod, and the large gasket is fixedly connected to the dynamic model core mounting plate; the spring is sleeved on the hollow straight rod and the positioning screw; the small gasket is sleeved on the positioning screw, and the small gasket is connected to the head of the positioning screw; the positioning screw is connected to one end of the hollow straight rod with a thread.

5. The center ejection device of an engineering plastic retainer mold according to claim 1, characterized in that: It also includes a bottom needle plate and an ejector column; one end of the ejector rod contacts the center ejector rod through a positioning screw, the other end of the ejector rod is connected to one side of the bottom needle plate, and the other side of the bottom needle plate is connected to the ejector column.

6. The center ejection device of an engineering plastic retainer mold according to claim 1, characterized in that: A conical groove matching the conical lock port is provided inside one end of the exhaust core sleeve, and an annular boss is provided outside the other end; an annular concave boss is provided inside the dynamic mold core, and the annular concave boss matches the annular boss.

7. The center ejection device of an engineering plastic retainer mold according to claim 1, characterized in that: A sealing ring is provided between the dynamic mold core base plate and the dynamic mold plate.

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