A side demoulding structure of an injection mold for a special-shaped three-way pipe fitting

Abstract

The technical solution of the present invention is a side demolding structure for an injection mold of a special-shaped three-way pipe fitting, comprising a lower mold that supports the lower outer surface of the product, the lower mold being provided with an installation cavity below the outer side of the product's side pipe joint, a bottom plate being provided in the installation cavity, a lifting mechanism being connected below the bottom plate, a straight core-pulling device and a positioning device that are inserted into the product's side pipe joint from the front, a toggle device being further provided on the bottom plate, a toggle ring being provided at the front end of the toggle device; the front end of the straight core-pulling device can enter and exit the inner hole of the product's side pipe joint, the lifting mechanism ejects the product from the lower mold insert, the toggle ring being located outside the pipe opening of the product's side pipe joint and driven by the toggle device to toggle the product out of the positioning device. The present invention achieves smooth demolding of the product through local core-pulling combined with toggling the product's rotational motion.

Description

Technical Field

[0001] The invention relates to a demoulding structure for an injection mold product, in particular to a side demoulding structure for an injection mold for a special-shaped three-way pipe fitting. Background Art

[0002] Plastic three-way pipe joints are commonly used building materials in the construction industry. They are all made by injection molding. The demoulding and core pulling structure in the injection mold is very important. Generally, plastic pipe joints are cylindrical, which is convenient for demoulding and core pulling. However, some occasions require a special-shaped plastic three-way pipe joint with a large middle and small ends. Since the inner hole of this pipe joint is large in the middle and small at both ends, the demoulding and core pulling structure design of this type of plastic pipe joint is very difficult. The demoulding of the two ends in the axial direction can be achieved by designing a complex structure, but the demoulding of the side is difficult to design. Products such as Figure 1 As shown, because the shape of the pipe joint extending from the side of the product is an irregular arc shape, the product cannot be directly designed with a core-pulling structure. The ordinary core-pulling structure can easily damage the inside of the product during core pulling, which is a technical problem. Summary of the Invention

[0003] In view of the above problems, the present invention aims to provide a side demoulding structure for an injection mold of a special-shaped three-way pipe fitting, which has a novel structure and can smoothly demould the product by locally pulling the core and rotating the product.

[0004] The technical solution of the present invention is a side demolding structure of an injection mold for a special-shaped three-way pipe fitting, comprising a lower mold supporting the lower outer surface of the product, the lower mold being located below the outer side of the side pipe joint of the product and having an installation cavity, the installation cavity being provided with a base plate, the base plate being connected below the base plate, a straight core pulling device and a positioning device being inserted into the side pipe joint of the product from the front, a toggle device being further provided on the base plate, a toggle ring being provided at the front end of the toggle device; the front end of the straight core pulling device can enter and exit the inner hole of the side pipe joint of the product, the lifting mechanism ejects the product from the lower mold insert, the toggle ring is located outside the pipe orifice of the side pipe joint of the product and toggles the product out of the positioning device under the drive of the toggle device.

[0005] Preferably, the lifting mechanism includes a lifting cylinder arranged below the lower mold, and the cylinder rod of the lifting cylinder passes through the lower mold and is connected to the bottom surface of the base plate. A plurality of guide rods are correspondingly connected to the bottom surface of the base plate, and a guide sleeve is provided at the position corresponding to the guide rod in the lower mold. When the lifting cylinder lifts the base plate, the guide rod slides in the inner hole of the guide sleeve.

[0006] Preferably, the straight core pulling device includes a T-shaped slide rail connected to the base plate, the length direction of the T-shaped slide rail is consistent with the axial direction of the inner hole of the product side pipe joint, and a corresponding slider is provided on the T-shaped slide rail. The front end of the slider is connected to a straight core pulling block whose shape is adapted to the inner wall of the product side pipe joint, the rear end of the base plate is connected to a vertical mounting plate, and the vertical mounting plate is connected to a core pulling cylinder, and the cylinder rod of the core pulling cylinder passes through the vertical mounting plate and is connected to the rear side of the slider.

[0007] Preferably, the front end of the straight core pulling block is connected with a small core pulling insert.

[0008] Preferably, the positioning device includes a fixing rod connected to the vertical mounting plate, the length direction of the fixing rod is consistent with the length direction of the T-shaped slide rail, the shape of the front end of the fixing rod corresponds to the shape of the arc-shaped inner wall of the product side pipe joint, and the straight core pulling block moves forward into place under the push of the core pulling cylinder and cooperates with the fixing rod to form a complete surface corresponding to the shape of the intersection of the product side pipe.

[0009] Preferably, a small positioning insert is connected to the front end of the fixing rod.

[0010] Preferably, the toggle device includes a guide block connected to the bottom plate, the guide block is arranged parallel to the length direction of the T-shaped slide rail, a sliding plate is correspondingly provided on the guide block, the front end of the sliding plate is connected to a toggle ring, the toggle ring is located outside the outer end face of the product side pipe joint and the cross-sectional shape is adapted to the end face of the product side pipe joint, an elastic element and a limit rod are provided between the sliding plate and the vertical mounting plate, a connecting block is provided on the surface of the lower mold mounting cavity outside the sliding plate, a first vertical positioning plate at the front and a second vertical positioning plate at the rear are spaced apart along the length direction on the connecting block, the sliding Two upper and lower rollers are provided on the front of the outer side of the plate, and a hook is provided on the rear part through a torsion spring hinge. The top of the first vertical positioning plate is a guiding inclined surface with a higher front and a lower back, and an arc-shaped transition surface is provided on the outer side of the front end of the second vertical positioning plate; when the lifting cylinder retracts, the roller contacts and limits the rear side of the first vertical positioning plate, and the hook contacts and limits the rear side of the second vertical positioning plate; when the lifting cylinder is pushed upward, the hook and the roller move upward to separate from the second vertical positioning plate and the first vertical positioning plate respectively, at this time the elastic element pops the sliding plate forward, and the toggle ring rotates the product out of the positioning device against the outer end face of the pipe joint on the side of the product.

[0011] Preferably, the elastic element is a compression spring or a nitrogen cylinder.

[0012] Preferably, the cross-sectional shape of the toggle ring corresponds to the shape of the left half of the outer end face of the product side pipe joint. When the toggle ring pops forward, it contacts the left half of the outer end face of the product side pipe joint to rotate the product and pop it off.

[0013] The present invention realizes smooth demoulding of the product through the coordinated linkage of the lifting mechanism, the straight core-pulling device, the positioning device and the toggle device, changes the traditional concept of core-pulling demoulding, and creates a new structure for promoting product rotation demoulding. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the product of the present invention;

[0015] Figure 2 This is a schematic structural diagram of the first state after the mold is opened;

[0016] Figure 3 for Figure 2 Structural diagram from another perspective;

[0017] Figure 4 for Figure 2 Schematic diagram of the connection structure of the straight core pulling device, positioning device and toggle device in the state;

[0018] Figure 5 This is a structural schematic diagram of the second state after core pulling of the present invention;

[0019] Figure 6 for Figure 5 Structural diagram from another perspective;

[0020] Figure 7 for Figure 5 Schematic diagram of the connection structure of the straight core pulling device, positioning device and toggle device in the state;

[0021] Figure 8 This is a schematic structural diagram of the present invention in the third state after ejection;

[0022] Figure 9 for Figure 8 Structural diagram from another perspective;

[0023] Figure 10 for Figure 8 Schematic diagram of the connection structure of the straight core pulling device, positioning device and toggle device in the state;

[0024] Figure 11 This is a schematic diagram of the structure of the present invention in the fourth state after being toggled;

[0025] Figure 12 for Figure 11 Structural diagram from another perspective;

[0026] Figure 13 for Figure 11 Schematic diagram of the connection structure of the straight core pulling device, positioning device and toggle device in the state;

[0027] Among them: 1—lower mold; 3—installation cavity; 4—bottom plate; 41—guide rod; 5—lifting mechanism; 51—lifting cylinder; 6—straight core pulling device; 61—T-shaped slide rail; 62—slider; 63—straight core pulling block; 64—vertical mounting plate; 65—core pulling cylinder; 66—small core pulling insert; 7—positioning device; 71—fixing rod; 72—positioning small insert; 8—toggle device; 81—toggle ring; 82—guide block; 83—sliding plate; 831—roller; 832—hook; 84—elastic element; 85—limiting rod; 86—connecting block; 87—first vertical positioning plate; 871—guide inclined surface; 88—second vertical positioning plate. Implementation Method

[0028] The present invention will be described in further detail below with reference to the accompanying drawings.

[0029] like Figures 2 to 13 As shown, the present invention provides a side demolding structure of a special-shaped three-way pipe fitting injection mold, including a lower mold 1 supporting the lower outer surface of the product, the lower mold 1 is located below the outer side of the product side pipe joint and is provided with a mounting cavity 3, a bottom plate 4 is provided in the mounting cavity 3, a lifting mechanism 5 is connected below the bottom plate 4, a straight core pulling device 6 and a positioning device 7 inserted into the product side pipe joint from the front are provided on the bottom plate 4, a toggle device 8 is also provided on the bottom plate 4, a toggle ring 81 is provided at the front end of the toggle device 8; the front end of the straight core pulling device 6 can enter and exit the inner hole of the product side pipe joint, the lifting mechanism 5 pushes the product out of the lower mold insert 2, the toggle ring 81 is located outside the pipe mouth of the product side pipe joint and drives the toggle device 8 to toggle the product out of the positioning device 7.

[0030] On the basis of the above scheme, the lifting mechanism 5 includes a lifting cylinder 51 arranged below the lower mold 1. The cylinder rod of the lifting cylinder 51 passes through the lower mold 1 and is connected to the bottom surface of the base plate 4. The bottom surface of the base plate 4 is correspondingly connected to a plurality of guide rods 41. A guide sleeve is provided at the position corresponding to the guide rod 41 in the lower mold 1. When the lifting cylinder 51 lifts the base plate 4, the guide rod 41 slides in the inner hole of the guide sleeve.

[0031] Specifically, the straight core pulling device 6 includes a T-shaped slide rail 61 connected to the base plate 4, the length direction of the T-shaped slide rail 61 is consistent with the axial direction of the inner hole of the product side pipe joint, and a corresponding slider 62 is provided on the T-shaped slide rail 61. The front end of the slider 62 is connected to a straight core pulling block 63 whose shape is adapted to the inner wall of the product side pipe joint. The rear end of the base plate 4 is connected to a vertical mounting plate 64, and the vertical mounting plate 64 is connected to a core pulling cylinder 65. The cylinder rod of the core pulling cylinder 65 passes through the vertical mounting plate 64 and is connected to the rear side of the slider 62.

[0032] The front end of the straight core pulling block 63 is connected to a small core pulling insert 66 .

[0033] Specifically, the positioning device 7 includes a fixing rod 71 connected to the vertical mounting plate 64. The length direction of the fixing rod 71 is consistent with the length direction of the T-shaped slide rail 61. The shape of the front end of the fixing rod 71 corresponds to the shape of the arc-shaped inner wall of the product side pipe joint. When the straight core pulling block 63 moves forward into place under the push of the core pulling cylinder 65, it cooperates with the fixing rod 71 to form a complete surface corresponding to the shape of the intersection of the product side pipe.

[0034] Wherein, a small positioning insert 72 is connected to the front end of the fixing rod 71 .

[0035] In addition, the toggle device 8 includes a guide block 82 connected to the bottom plate 4, the guide block 82 is arranged parallel to the length direction of the T-shaped slide rail 61, and a sliding plate 83 is correspondingly provided on the guide block 82. The front end of the sliding plate 83 is connected to a toggle ring 81, and the toggle ring 81 is located on the outside of the outer end face of the product side pipe joint and its cross-sectional shape is adapted to the end of the product side pipe joint. An elastic element 84 and a limit rod 85 are provided between the sliding plate 83 and the vertical mounting plate 64. A connecting block 86 is provided on the surface of the lower mold mounting cavity 3 outside the sliding plate 83. A first vertical positioning plate 87 located at the front and a second vertical positioning plate 88 located at the rear are spaced apart along the length direction on the connecting block 86. The outside of the sliding plate 83 Two upper and lower rollers 831 are provided at the front, and a hook 832 is provided at the rear through a torsion spring hinge. The top of the first vertical positioning plate 87 is a guiding inclined surface 871 with a high front and a low back, and the outer side of the front end of the second vertical positioning plate 88 is provided with an arc-shaped transition surface; when the lifting cylinder 51 retracts, the roller 831 contacts and limits the rear side of the first vertical positioning plate 87, and the hook 832 contacts and limits the rear side of the second vertical positioning plate 88; when the lifting cylinder 51 is pushed upward, the hook 832 and the roller 831 move upward respectively to separate from the second vertical positioning plate 88 and the first vertical positioning plate 87. At this time, the elastic element 84 pops the sliding plate 83 forward, and the toggle ring 81 rotates the product from the positioning device 7 against the outer end face of the pipe joint on the side of the product.

[0036] The elastic element 84 is a compression spring or a nitrogen cylinder.

[0037] Furthermore, the cross-sectional shape of the toggle ring 81 corresponds to the shape of the left half of the outer end face of the product side pipe joint. When the toggle ring 81 pops forward, it contacts the left half of the outer end face of the product side pipe joint to rotate the product and pop it off.

[0038] The working process of the present invention is as follows: After the product is injection molded and the mold is opened, the cores on both sides are first pulled out through a special core pulling mechanism. At this time, the state of the product is as follows: Figure 2 and Figure 3As shown, the corresponding straight core pulling device 6, positioning device 7, and toggle device 8 are structured as follows: Figure 4 Then the core pulling cylinder 65 pulls the slider 62 backwards, and the straight core pulling block 63 and the core pulling small insert 66 are both withdrawn from the pipe joint on the side of the product. At this time, the state of the product is as follows Figure 5 and Figure 6 As shown, the corresponding straight core pulling device 6, positioning device 7, and toggle device 8 are structured as follows: Figure 7 Then the lifting cylinder 51 pushes the bottom plate 4 upwards, and the fixed rod 71 drags the product and pushes it upwards synchronously with the bottom plate 4. At this time, the state of the product is as follows Figure 8 and Figure 9 As shown, the corresponding straight core pulling device 6, positioning device 7, and toggle device 8 are structured as follows: Figure 10 As shown. When the height of the bottom plate 4 gradually rises until the hook 832 reaches the top of the second vertical positioning plate 88 and disengages, the elastic element 84 instantly pops out the sliding plate 83, and the setting of the limit rod 85 sets the pop-up distance of the sliding plate 83. During the pop-up process of the sliding plate 83, the toggle ring 81 pops out and contacts the outer end face of the pipe joint on the side of the product. While the product is being popped out, it rotates and exits along the curved inner wall of the front end face of the fixed rod 71, realizing smooth demoulding of the product. Under the limit of the limit rod 85, when the sliding plate 83 moves forward to the extreme position, the roller 831 is located above the guide inclined surface 871 of the positioning plate 87. At this time, the overall structure is as shown. Figure 11 and Figure 12 As shown, the corresponding straight core pulling device 6, positioning device 7, and toggle device 8 are structured as follows: Figure 13 During the later resetting, the lifting cylinder 51 retracts the bottom plate 4 downward, and the roller 831 below retreats downward and backward along the guide inclined surface 871. The hook 832 contacts the arc-shaped transition surface at the front end of the second vertical positioning plate 88 and rotates outward under the action of its torsion spring. It passes along the arc-shaped transition surface and then engages and hooks the rear side of the second vertical positioning plate 88. During this process, the elastic element 84 is compressed and reset again, and the limit rod 85 also retreats and resets again, realizing the reset of the wave device 8. After the lifting cylinder 51 retracts downward and the bottom plate 4 is reset, the core-pulling cylinder 65 pushes the slider 62 forward and resets it, realizing the reset of the entire mechanism and waiting for the next product injection.

[0039] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the invention. Any simple modification, equivalent change or modification made to the above embodiment based on the technical principle of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A side demoulding structure of an injection mold for a special-shaped three-way pipe fitting, comprising a lower mold (1) supporting the lower outer surface of the product, characterized in that: The lower mold (1) is provided with an installation cavity (3) located below the outer side of the product side pipe joint, a bottom plate (4) is provided in the installation cavity (3), a lifting mechanism (5) is connected below the bottom plate (4), a straight core pulling device (6) and a positioning device (7) are provided on the bottom plate (4), and a toggle device (8) is also provided on the bottom plate (4), and a toggle ring (81) is provided at the front end of the toggle device (8); the front end of the straight core pulling device (6) can enter and exit the inner hole of the product side pipe joint, and the lifting mechanism (5) pushes the product out of the lower mold insert (2). The toggle ring (81) is located outside the pipe opening of the product side pipe joint and is driven by the toggle device (8) to toggle the product out of the positioning device (7); the toggle device (8) includes a guide block (82) connected to the bottom plate (4), the guide block (82) is arranged parallel to the length direction of the T-shaped slide rail (61), and a sliding plate (83) is correspondingly provided on the guide block (82). The front end of the sliding plate (83) is connected to the toggle ring (81), the toggle ring (81) is located outside the outer end face of the product side pipe joint and has a cross-sectional shape that matches the end of the product side pipe joint. The sliding plate (83) An elastic element (84) and a limiting rod (85) are provided between the sliding plate (83) and the vertical mounting plate (64). A connecting block (86) is provided on the surface of the lower mold mounting cavity (3) outside the sliding plate (83). A first vertical positioning plate (87) located at the front and a second vertical positioning plate (88) located at the rear are provided on the connecting block (86) at intervals along the length direction. Two upper and lower rollers (831) are provided at the front of the outer side of the sliding plate (83), and a hook (832) is provided at the rear through a torsion spring hinge. The top of the first vertical positioning plate (87) is a guide inclined surface (871) with a high front and a low rear. The second vertical positioning plate (87) is provided at the top of the lower mold mounting cavity (3) outside the sliding plate (83). An arc-shaped transition surface is provided on the outer side of the front end of the positioning plate (88); when the lifting cylinder (51) is retracted, the roller (831) contacts the rear side of the first vertical positioning plate (87) for a limit position, and the hook (832) contacts the rear side of the second vertical positioning plate (88) for a limit position; when the lifting cylinder (51) is pushed upward, the hook (832) and the roller (831) move upward to separate from the second vertical positioning plate (88) and the first vertical positioning plate (87), respectively, at which time the elastic element (84) pops the sliding plate (83) forward, and the toggle ring (81) faces the outer end face of the pipe joint on the side of the product to pop the product off the positioning device (7).

2. The side demoulding structure of the injection mold for a special-shaped three-way pipe fitting according to claim 1, characterized in that: The lifting mechanism (5) includes a lifting cylinder (51) arranged below the lower mold (1). The cylinder rod of the lifting cylinder (51) passes through the lower mold (1) and is connected to the bottom surface of the base plate (4). The bottom surface of the base plate (4) is correspondingly connected to a plurality of guide rods (41). Guide shaft sleeves are provided at positions corresponding to the guide rods (41) in the lower mold (1). When the lifting cylinder (51) lifts the base plate (4), the guide rods (41) slide in the inner holes of the guide shaft sleeves.

3. The side demoulding structure of the injection mold for a special-shaped three-way pipe fitting according to claim 2, characterized in that: The straight core pulling device (6) includes a T-shaped slide rail (61) connected to the base plate (4), the length direction of the T-shaped slide rail (61) is consistent with the axial direction of the inner hole of the product side pipe joint, and a corresponding slider (62) is provided on the T-shaped slide rail (61), and the front end of the slider (62) is connected to a straight core pulling block (63) whose shape is adapted to the inner wall of the product side pipe joint, and the rear end of the base plate (4) is connected to a vertical mounting plate (64), and the vertical mounting plate (64) is connected to a core pulling cylinder (65), and the cylinder rod of the core pulling cylinder (65) passes through the vertical mounting plate (64) and is connected to the rear side of the slider (62).

4. The side demoulding structure of the injection mold for a special-shaped three-way pipe fitting according to claim 3, characterized in that: The front end of the straight core pulling block (63) is connected to a core pulling small insert (66).

5. The side demoulding structure of the injection mold for a special-shaped three-way pipe fitting according to claim 3, characterized in that: The positioning device (7) includes a fixing rod (71) connected to the vertical mounting plate (64), the length direction of the fixing rod (71) is consistent with the length direction of the T-shaped slide rail (61), the shape of the front end of the fixing rod (71) corresponds to the shape of the arc-shaped inner wall of the product side pipe joint, and when the straight core pulling block (63) moves forward into position under the push of the core pulling cylinder (65), it cooperates with the fixing rod (71) to form a complete surface corresponding to the shape of the intersection of the product side pipe.

6. The side demoulding structure of the injection mold for a special-shaped three-way pipe fitting according to claim 5, characterized in that: A small positioning insert (72) is connected to the front end of the fixing rod (71).

7. The side demoulding structure of the injection mold for a special-shaped three-way pipe fitting according to claim 1, characterized in that: The elastic element (84) is a compression spring or a nitrogen cylinder.

8. The side demoulding structure of the injection mold for a special-shaped three-way pipe fitting according to claim 1, characterized in that: The cross-sectional shape of the toggle ring (81) corresponds to the shape of the left half of the outer end face of the pipe joint on the side of the product. When the toggle ring (81) pops forward, it contacts the left half of the outer end face of the pipe joint on the side of the product, rotating the product to pop it out.

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