Injection mold with air ejection discharging structure

Abstract

The utility model relates to the technical field of injection molds, in particular to an injection mold with an air ejection discharging structure. The injection mold mainly aims at solving the problems that a common injection mold is easily influenced by a jacking structure in the injection molding process, so that the bottom end of part of the jacking structure is arranged in a pressure cavity and does not rise, jacking and discharging of an injection molding part are influenced, meanwhile, due to the fact that stress points of the injection mold are not uniform in the jacking process, the finished injection molding part is damaged and deformed, and the product quality is poor. According to the technical scheme, the injection mold comprises a lower mold base and an upper mold base, a pressure cavity is formed in the lower mold base, a jacking assembly facilitating jacking and demolding of an injection molding part is arranged at the position of a molding cavity and the pressure cavity of the lower mold base, and the jacking assembly comprises a jacking block. According to the utility model, the risk of damage and deformation caused by non-uniform stress of a product in the jacking and discharging process is reduced while jacking and discharging are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an injection mold with an air ejection structure. Background Art

[0002] An injection mold is a plastic molding mold. By injecting materials into the plastic cavity between the upper mold base and the lower mold base, the materials can be molded into products under the sealing action of the upper mold base and the lower mold base. Currently, a jacking structure is arranged in the plastic cavity of the injection mold, and the molded product is demolded by means of pressure, which is convenient for workers to take out the finished product from the plastic cavity of the injection mold.

[0003] However, common injection molds are easily affected by the jacking structure during the injection process, resulting in the bottom ends of some jacking structures being disposed in the pressure cavity without rising, which affects the ejection of the injection parts. At the same time, due to the uneven stress points of the injection mold during jacking, the finished injection parts are damaged and deformed, reducing the product quality. In view of this, we propose an injection mold with an air ejection structure. Summary of the Utility Model

[0004] The purpose of the utility model is to propose an injection mold with an air ejection structure for the problems existing in the background art.

[0005] The technical solution of the utility model: an injection mold with an air ejection structure, including a lower mold base and an upper mold base. A pressure cavity is opened inside the lower mold base. A jacking assembly for facilitating the jacking and demolding of the injection parts is arranged at the plastic cavity and the pressure cavity of the lower mold base. The jacking assembly includes a jacking block. A jacking rod is connected to the bottom wall of the jacking block. A collar is sleeved on the outer surface of the jacking rod. A spring is connected to the top wall of the collar. A piston plate is arranged in the pressure cavity of the lower mold base.

[0006] An activity assembly for facilitating the height adjustment of the jacking assembly is installed at the top of the piston plate. The activity assembly includes a rotating shaft. A gear and a cylindrical gear are sleeved on the outer surface of the rotating shaft. An activity plate is arranged on one side of the cylindrical gear. A top plate is connected to the top wall of the activity plate. A bearing seat is arranged at one end of the rotating shaft.

[0007] A driving assembly for facilitating the lifting of the activity assembly is installed on the top wall of the bottom plate of the lower mold base. The driving assembly includes a double-sided toothed plate. An auxiliary block is welded on the front wall of the double-sided toothed plate. Hydraulic cylinders are symmetrically arranged on the bottom wall of the auxiliary block.

[0008] Preferably, a through hole is opened in the middle of the piston plate. An electromagnetic valve is installed in the through hole. A photoelectric sensor is installed on the outer wall of the lower mold base.

[0009] Preferably, a T-shaped hole is formed in the bottom wall of the plastic cavity of the lower die base, and the top block is arranged in the upper part structure of the T-shaped hole.

[0010] Preferably, a T-shaped hole is formed in the bottom wall of the plastic cavity of the lower die base, and the top block is arranged in the upper part structure of the T-shaped hole.

[0011] Preferably, the gear is located outside the lower die base, and the gear is also located on one side of the double-sided tooth plate, and the gear meshes with the side teeth of the double-sided tooth plate.

[0012] Preferably, a tooth groove is formed in the side wall of the movable plate, and the cylindrical gear meshes with the tooth groove.

[0013] Preferably, the bearing seat is installed on the inner wall of the pressure cavity, and the rotating end of the bearing seat is connected to the end of the rotating shaft.

[0014] Compared with the prior art, the utility model has the following beneficial technical effects:

[0015] Through the pressure cavity formed in the lower die base, when the hydraulic cylinder drives the auxiliary block to descend, the gear drives the rotating shaft to rotate, and the rotation of the cylindrical gear drives the movable plate to rise. During the rising process of the movable plate, the piston plate is driven to rise, and the space above the piston plate is pressurized, so that a plurality of ejector rods push the top block to rise under the action of pressure, realizing the ejection of the product on the lower die base. When some ejector rods do not rise, the electromagnetic valve is opened to introduce the pressure in the space above the piston plate into the space below the piston plate. At this time, the piston plate is in a continuous rising state, so that the ejector rods that do not rise are activated under the rising action of the piston plate, avoiding the situation that the ejector rods do not eject at the same time and preventing damage to the injection molded parts during the ejection process. Description of the Drawings

[0016] Figure 1 is a three-dimensional structural schematic diagram of an injection mold with a gas-assisted ejection structure;

[0017] Figure 2 is Figure 1 the internal structural schematic diagram after removing the cover;

[0018] Figure 3 is Figure 2 the three-dimensional structural schematic diagram of the jacking assembly in

[0019] Figure 4 is Figure 1 the matching structural schematic diagram of the movable assembly and the driving assembly in

[0020] Reference numerals: 1, lower die holder; 2, upper die holder; 3, lifting assembly; 31, ejector block; 32, ejector rod; 33, collar; 34, spring; 4, piston plate; 5, movable assembly; 51, rotating shaft; 52, gear; 53, cylindrical gear; 54, movable plate; 55, top plate; 56, bearing block; 6, drive assembly; 61, double-sided toothed plate; 62, auxiliary block; 63, hydraulic cylinder; 7, solenoid valve; 8, photoelectric sensor. Detailed implementation mode

[0021] The technical solution of the present utility model will be further described below in conjunction with the attached drawings and specific embodiments.

[0022] Embodiment

[0023] As Figures 1-4 shown, an injection mold with a gas-assisted ejection structure proposed by the present utility model includes a lower die holder 1 and an upper die holder 2 provided with a plastic cavity. A pressure cavity is also provided inside the lower die holder 1. A plurality of T-shaped holes are provided in the wall between the pressure cavity of the lower die holder 1 and the plastic cavity. A lifting assembly 3 for facilitating the lifting and demolding of the injection molded part is arranged at the plurality of T-shaped holes. The lifting assembly 3 includes an ejector block 31, an ejector rod 32, a collar 33 and a spring 34. The ejector block 31 is located in the plastic cavity of the lower die holder 1 and is arranged in the upper part space of the T-shaped hole. The ejector rod 32 is arranged in the pressure cavity. The top end of the ejector rod 32 is arranged in the lower part space of the T-shaped hole and is fixedly connected to the bottom wall of the ejector block 31. The diameter of the ejector block 31 is larger than that of the ejector rod 32, which is used to prevent the ejector rod 32 in the moving state from disengaging from the pressure cavity and affecting subsequent use. The ejector rod 32 in the moving state can drive the ejector block 31 to complete the lifting and demolding of the injection molded part, facilitating the staff to take out the injection molded part from the plastic cavity of the lower die holder 1; the collar 33 is fixedly sleeved on the outer surface of the ejector rod 32, and the spring 34 is sleeved on the ejector rod 32 and is arranged in a non-connected state with the ejector rod 32. The top end of the spring 34 is connected to the top wall of the pressure cavity, and the bottom end is connected to the top wall of the collar 33, which is used to assist the ejector rod 32 to reset and is beneficial for repeated use.

[0024] Furthermore, the piston plate 4 is located in the pressure cavity. A solenoid valve 7 is installed in the through hole opened in the middle part of the piston plate 4, so that when the piston plate 4 moves up and down, the pressure in the pressure cavity can be adjusted by opening the solenoid valve 7; the photoelectric sensor 8 is fixedly installed outside the lower die holder 1 and is used to monitor the lifting and lowering conditions of the ejector rod 32.

[0025] Furthermore, an active component 5 for facilitating the height adjustment of the jacking component 3 is installed at the top of the piston plate 4. The active component 5 includes a rotating shaft 51, a gear 52, a cylindrical gear 53, an active plate 54, a top plate 55, and a bearing seat 56. Rotating holes are symmetrically formed on the lower die base 1, and sealed bearings are arranged in both of the two rotating holes. Due to the symmetrical arrangement of the two groups of active components 5, the two sealed bearings are respectively sleeved on the rotating shafts 51 corresponding in position; the bearing seat 56 is fixedly installed on the inner wall of the pressure chamber, and one end of the rotating shaft 51 passes through the rotating hole and is connected to the rotating end of the bearing seat 56. The cooperation between the bearing seat 56 and the sealed bearing assists the rotation of the rotating shaft 51; the gear 52 and the cylindrical gear 53 are respectively arranged outside the lower die base 1 and in the pressure chamber, and are both fixedly sleeved on the outer surface of the rotating shaft 51; active openings are symmetrically formed on the top wall of the lower die base 1. The bottom end of the active plate 54 passes through the active opening and is fixedly connected to the top wall of the piston plate 4 in the pressure chamber, which is beneficial for driving the piston plate 4 to rise and fall; the cylindrical gear 53 meshes with the tooth groove formed on the side wall of the active plate 54, which is convenient for driving the active plate 54 to move; the top plate 55 is located at the top of the lower die base 1 and is fixedly installed on the top wall of the active plate 54. At the same time, its size is larger than that of the active opening, which is beneficial for preventing the whole active plate 54 from entering the pressure chamber during the movement process, affecting the reset and reuse. Since the active plate 54 can rise and fall under the rotation of the cylindrical gear 53, the piston plate 4 can be driven to rise and fall during its rising and falling process. The piston plate 4 in the rising state can adjust the pressure of the pressure chamber, and the ejector rod 32 can be driven to rise under the pressure. If some ejector rods 32 do not rise under the influence of pressure, the active plate 54 can be operated to continue rising, so that the piston plate 4 contacts the ejector rod 32, and the ejector rod 32 that does not rise under the influence of pressure can be pushed to move, reducing the risk of damage and deformation of the product due to uneven force during the jacking and discharging process.

[0026] Furthermore, a driving component 6 for facilitating the lifting of the active component 5 is installed on the top wall of the bottom plate of the lower die base 1. The driving component 6 includes a double-sided toothed plate 61, an auxiliary block 62, and a hydraulic cylinder 63. The double-sided toothed plate 61 is located on the front-facing wall of the lower die base 1, and the auxiliary block 62 is welded on the front-facing wall of the double-sided toothed plate 61. The two hydraulic cylinders 63 are symmetrically installed on the top wall of the base of the lower die base 1, and the output ends of the two hydraulic cylinders 63 are fixedly connected to the bottom wall of the auxiliary block 62. Thus, the auxiliary block 62 can be driven to drive the double-sided toothed plate 61 to rise by the hydraulic cylinder 63. Since the teeth on both sides of the double-sided toothed plate 61 mesh with the corresponding gears 52, the rising and falling states of the active plate 54 can be adjusted under the action of the rising and falling of the double-sided toothed plate 61, providing power for the jacking and discharging.

[0027] The above specific embodiments are only several preferred embodiments of the present utility model. Based on the technical solution of the present utility model and the relevant revelations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. An injection mold with a gas-lifted discharging structure, comprising a lower mold base (1) and an upper mold base (2), wherein a pressure chamber is formed inside the lower mold base (1), and it is characterized in that: A lifting component (3) for facilitating the lifting and demolding of injection molded parts is provided at the plastic cavity and pressure cavity of the lower mold base (1). The lifting component (3) includes a lifting block (31). A lifting rod (32) is connected to the bottom wall of the lifting block (31). A collar (33) is sleeved on the outer surface of the lifting rod (32). A spring (34) is connected to the top wall of the collar (33). A piston plate (4) is provided in the pressure cavity of the lower mold base (1). An activity component (5) for facilitating the height adjustment of the lifting component (3) is installed at the top of the piston plate (4). The activity component (5) includes a rotating shaft (51). A gear (52) and a cylindrical gear (53) are sleeved on the outer surface of the rotating shaft (51). An activity plate (54) is provided on one side of the cylindrical gear (53). A top plate (55) is connected to the top wall of the activity plate (54). A bearing seat (56) is provided at one end of the rotating shaft (51). A driving component (6) for facilitating the lifting and lowering of the activity component (5) is installed on the top wall of the bottom plate of the lower mold base (1). The driving component (6) includes a double-sided toothed plate (61). An auxiliary block (62) is welded to the front-facing wall of the double-sided toothed plate (61). Hydraulic cylinders (63) are symmetrically provided on the bottom wall of the auxiliary block (62).

2. The injection mold with an air jacking discharging structure according to claim 1, characterized in that, A through hole is provided in the middle part of the piston plate (4). An electromagnetic valve (7) is installed in the through hole. A photoelectric sensor (8) is installed on the outer side wall of the lower mold base (1).

3. An injection mold with a pneumatic ejection structure according to claim 1, characterized in that, A T-shaped hole is provided in the bottom wall of the plastic cavity of the lower mold base (1). The lifting block (31) is arranged in the upper part structure of the T-shaped hole.

4. An injection mold with an air jacking discharging structure according to claim 1, characterized in that, The collar (33) is sleeved on the outer circle of the lifting rod (32). The top end of the collar (33) is connected to the top wall of the inner wall of the pressure cavity.

5. An injection mold with a pneumatic ejection structure according to claim 1, characterized in that, The gear (52) is located outside the lower mold base (1). The gear (52) is also located on one side of the double-sided toothed plate (61). The gear (52) meshes with the side teeth of the double-sided toothed plate (61).

6. The injection mold with an air-top discharging structure according to claim 1, characterized in that, Tooth grooves are provided on the side wall of the activity plate (54). The cylindrical gear (53) meshes with the tooth grooves.

7. An injection mold with a pneumatic ejection structure according to claim 1, characterized in that, The bearing seat (56) is installed on the inner wall of the pressure cavity. The rotating end of the bearing seat (56) is connected to the end of the rotating shaft (51).

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