Injection molding fill and needle extraction mechanism

Abstract

The utility model relates to injection mold technical field, concretely relates to a kind of injection filling needle extraction mechanism, including the insert needle of the inside joint of mould core and the oil cylinder for driving insert needle to move, the top end of insert needle is jointed with slider, the outside of slider is sleeved with connecting block, the output end of oil cylinder is fixedly connected with inclined wedge block, the outside of inclined wedge block is equipped with mounting seat, the inclined wedge block is provided with the card rail matched with the slider, the junction of slider and card rail is provided with locking member, when the inclined wedge block pulls slider movement to working position, locking is carried out using locking member.Injection pressure is applied on insert needle, using locking member makes slider and the card rail under inclined wedge block stick more tightly, when needle is extracted, inclined wedge block is pulled back by oil cylinder, the slider of inclined wedge block bottom and connecting block go up, drive insert needle to move up and realize half stroke needle extraction, filling continues to complete after needle extraction, effectively solve the problem that oil cylinder is not accurate in position, prone to retreat, impact under high-pressure injection environment.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to an injection filling needle extraction mechanism. Background Technology

[0002] In plastic molds, especially insert injection molding, it is often necessary to form specific holes or structures inside the product. This is usually achieved by setting movable inserts in the mold. In some complex processes, it is required to remove the inserts when the plastic filling is halfway complete in order to complete the remaining filling. This is to prevent the inserts from being tightly wrapped by the plastic and unable to be removed, or to protect the pre-placed inserts from deformation caused by the injection pressure.

[0003] In the prior art, patent CN207240755U discloses a sliding block pin extraction device for injection molds, including a hydraulic cylinder, a shovel, a sliding block positioning sleeve, a movable sliding block, and a pin insertion assembly. A radially inclined groove penetrating the movable sliding block is provided on the movable sliding block, with one end of the groove entrance being higher than the other. The shape of the shovel's connector is adapted to the groove, and the connector passes through the sliding block positioning sleeve and extends into the groove. The hydraulic cylinder drives the shovel to move perpendicular to the axis of the movable sliding block, thereby causing the movable sliding block to move along its axis. The pin insertion assembly is installed at the top of the movable sliding block.

[0004] The above structure adopts a movable needle-pulling structure design, but it mainly relies on the direct drive of the hydraulic cylinder. This can easily lead to problems such as inaccurate positioning of the cylinder, easy backward movement, and large impact under high-pressure injection molding environment, resulting in poor stability. Utility Model Content

[0005] In view of this, the purpose of this utility model is to propose an injection filling needle extraction mechanism to solve the problems that rely mainly on the direct drive of hydraulic cylinders, which easily leads to inaccurate positioning, easy backtracking, and large impact of the cylinders under high-pressure injection molding environment.

[0006] To achieve the above objectives, this utility model provides an injection filling needle extraction mechanism, including a pin that is engaged inside the mold core and an oil cylinder for driving the pin to move. A slider is engaged at the top of the pin, and a connecting block is sleeved on the outside of the slider.

[0007] The output end of the hydraulic cylinder is fixedly connected to a wedge block, and a mounting base is sleeved on the outside of the wedge block. The wedge block has a retaining rail that cooperates with the slider.

[0008] A locking element is provided at the connection between the slider and the rail. When the wedge block pulls the slider to the working position, the locking element is used to lock it.

[0009] Preferably, the locking component includes a guide rail and a pin hole at the top of the slider, wherein a positioning pin is inserted into the pin hole, and the positioning pin passes through the interior of the guide rail and the slider.

[0010] Preferably, the upper and lower ends of the slider are respectively provided with slots corresponding to the guide rail and the insert pin, and the slots are T-shaped.

[0011] Preferably, the pin holes are evenly distributed inside the rail, and the diameter of the pin holes matches the diameter of the positioning pins.

[0012] Preferably, the positioning pin is a tapered pin.

[0013] Preferably, the top of the slider has a bevel that matches the rail, and the rail has an inclination angle of 15°-30°.

[0014] The beneficial effects of this utility model are:

[0015] Before injection molding, the hydraulic cylinder drives the wedge block to move. The wedge block moves within the mounting base, and at the same time, the retaining rail on one side drives the insert pin at the bottom of the slider to move downward to the designated position before injection molding. When the injection pressure is applied to the insert pin, the locking device makes the slider and the retaining rail under the wedge block fit more tightly. When the pin needs to be withdrawn, the hydraulic cylinder pulls back the wedge block, and the slider and connecting block at the bottom of the wedge block move upward, driving the insert pin to move upward to achieve half-stroke pin withdrawal. After the pin is withdrawn, the filling continues to be completed.

[0016] The entire system replaces the traditional direct-drive hydraulic cylinder with a transmission mechanism, effectively solving problems such as inaccurate positioning, easy backward movement, and large impact of the hydraulic cylinder under high-pressure injection molding environment, thus improving stability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of the entire utility model;

[0019] Figure 2 This is a schematic diagram of the overall planar structure of this utility model;

[0020] Figure 3 This is an exploded structural diagram of the slider and wedge block of this utility model.

[0021] The markings in the diagram are: 1. Mold core; 2. Insert pin; 3. Hydraulic cylinder; 5. Locking component; 6. Mounting base; 7. Wedge block; 8. Slider; 9. Connecting block; 10. Slot; 11. Rail; 12. Pin hole; 13. Positioning pin. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0023] like Figure 1 , Figure 2 and Figure 3 As shown, an injection filling needle extraction mechanism includes a needle 2 that is snapped inside the mold core 1 and a hydraulic cylinder 3 for driving the needle 2 to move. A slider 8 is snapped onto the top of the needle 2, and a connecting block 9 is sleeved on the outside of the slider 8.

[0024] The output end of the hydraulic cylinder 3 is fixedly connected to a wedge block 7. The wedge block 7 is fitted with a mounting seat 6. The wedge block 7 has a retaining rail 11 that cooperates with the slider 8.

[0025] A locking element 5 is provided at the connection between the slider 8 and the rail 11. When the wedge block 7 pulls the slider 8 to the working position, the locking element 5 is used to lock it.

[0026] In this embodiment, before injection molding, the hydraulic cylinder 3 is installed in a fixed position. First, the hydraulic cylinder 3 drives the wedge block 7 to move. The wedge block 7 moves within the mounting base 6. At the same time, the retaining rail 11 on one side drives the insert pin 2 at the bottom of the slider 8 to move downward to the designated position before injection molding. When the injection pressure is applied to the insert pin 2, the locking member 5 makes the slider 8 and the retaining rail 11 under the wedge block 7 fit more tightly to prevent backward movement due to the injection pressure. When it is necessary to withdraw the pin, the hydraulic cylinder 3 pulls back the wedge block 7. The slider 8 and connecting block 9 at the bottom of the wedge block 7 move upward, driving the insert pin 2 to move upward to achieve half-stroke needle withdrawal, avoiding the influence of the full-stroke injection pressure on the insert pin 2. After needle withdrawal, the filling continues to be completed.

[0027] The entire system replaces the traditional direct-drive method of hydraulic cylinder 3 with a transmission mechanism, which effectively solves the problems of inaccurate positioning, easy backward movement, and large impact of hydraulic cylinder 3 under high-pressure injection molding environment, and improves stability.

[0028] As one implementation method, such as Figure 2 and Figure 3 As shown, the locking component 5 includes a retaining rail 11 and a pin hole 12 opened at the top of the slider 8. A positioning pin 13 is inserted into the pin hole 12, and the positioning pin 13 passes through the inside of the retaining rail 11 and the slider 8.

[0029] In this embodiment, the hydraulic cylinder 3 pushes the wedge block 7, and the wedge block 7 drives the slider 8 to bring the insert pin 2 into place. At this time, the huge injection pressure attempts to push the insert pin 2 and the slider 8 backward, but since the positioning pin 13 passes through the rail 11 and the inside of the slider 8, the injection pressure is converted into a connection force between the slider 8 and the wedge block 7, thus achieving locking.

[0030] As one implementation method, such as Figure 3 As shown, the upper and lower ends of the slider 8 are respectively provided with slots 10 corresponding to the rail 11 and the pin 2. The slots 10 are T-shaped structures.

[0031] In this embodiment, the inclined surface on the back of the slider 8 fits tightly with the retaining rail 11 at the bottom of the wedge block 7. The bottom end of the slider 8 is connected to the insert pin 2 by the retaining groove 10 and the connecting block 9, which facilitates disassembly. At the same time, the horizontal movement of the oil 32 can be converted into the vertical movement of the insert pin 2.

[0032] As one implementation method, such as Figure 3 As shown, pin holes 12 are evenly distributed inside the rail 11, and the diameter of the pin holes 12 matches the diameter of the positioning pins 13.

[0033] In this embodiment, the combination of pin hole 12 and positioning pin 13 replaces the hydraulic check valve, fundamentally eliminating the phenomenon of pin 2 retraction caused by oil circuit pressure fluctuations, and reducing the product deformation defect rate.

[0034] As one implementation method, such as Figure 3 As shown, the locating pin 13 is a tapered pin.

[0035] In this embodiment, a tapered pin is used to radially expand inside the pin hole 12, thereby forming a rigid connection between the slider 8 and the wedge block 7, thus achieving locking.

[0036] As one implementation method, such as Figure 1 , Figure 2 and Figure 3 As shown, the top of the slider 8 has a bevel that matches the rail 11, and the tilt angle of the rail 11 is 15°-30°.

[0037] In this embodiment, the inclined surface between the wedge block 7 and the slider 8 enables the pin 2 to be accurately positioned and stably stopped during the injection molding process. The inclined surface converts the linear motion of the cylinder 3 into the precise axial motion of the pin 2.

[0038] Working principle: During use, before injection molding, the hydraulic cylinder 3 drives the wedge block 7 to move. The wedge block 7 moves within the mounting base 6. At the same time, the retaining rail 11 on one side drives the insert pin 2 at the bottom of the slider 8 to move downward to the designated position before injection molding. When the injection pressure is applied to the insert pin 2, the locking part 5 makes the slider 8 and the retaining rail 11 under the wedge block 7 fit more tightly to prevent it from moving backward due to the injection pressure.

[0039] When needle removal is required, the hydraulic cylinder 3 moves in the opposite direction to pull back the wedge block 7. The slider 8 and connecting block 9 at the bottom of the wedge block 7 move upward, driving the insert needle 2 to move upward to achieve half-stroke needle removal. This completes the needle removal action and avoids the influence of the full-stroke injection pressure on the insert needle 2. After needle removal, the filling continues.

[0040] The entire system replaces the traditional direct-drive method of hydraulic cylinder 3 with a transmission mechanism, which effectively solves the problems of inaccurate positioning, easy backward movement, and large impact of hydraulic cylinder 3 under high-pressure injection molding environment, and improves stability.

[0041] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0042] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A needle-pulling mechanism for injection molding, comprising a needle (2) engaged inside a mold core (1) and a hydraulic cylinder (3) for driving the needle (2) to move, characterized in that, The top of the insert (2) is engaged with a slider (8), and a connecting block (9) is sleeved on the outside of the slider (8). The output end of the hydraulic cylinder (3) is fixedly connected to a wedge block (7), and a mounting seat (6) is sleeved on the outside of the wedge block (7). The wedge block (7) has a retaining rail (11) that cooperates with the slider (8). A locking element (5) is provided at the connection between the slider (8) and the rail (11). When the wedge block (7) pulls the slider (8) to the working position, the locking element (5) is used to lock it.

2. The injection filling needle extraction mechanism according to claim 1, characterized in that, The locking component (5) includes a rail (11) and a pin hole (12) at the top of the slider (8). A positioning pin (13) is inserted into the pin hole (12), and the positioning pin (13) passes through the interior of the rail (11) and the slider (8).

3. The injection filling needle extraction mechanism according to claim 2, characterized in that, The upper and lower ends of the slider (8) are respectively provided with slots (10) corresponding to the rail (11) and the pin (2), and the slots (10) are T-shaped.

4. The injection filling needle extraction mechanism according to claim 2, characterized in that, The pin holes (12) are evenly distributed inside the rail (11), and the diameter of the pin holes (12) matches the diameter of the positioning pin (13).

5. The injection filling needle extraction mechanism according to claim 2, characterized in that, The positioning pin (13) is a tapered pin.

6. The injection filling needle extraction mechanism according to claim 1, characterized in that, The top of the slider (8) has a bevel that matches the rail (11), the rail (11) having an inclination angle of 15°-30°.

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