High-efficiency demolding slide block for plastic mold

Abstract

The utility model discloses a kind of high-efficiency demolding sliding blocks for plastic mould, including slider body and reverse ejection mechanism, the slider body is close to the side of mould BOSS column and is provided with reverse ejection mechanism, the reverse ejection mechanism includes cylinder, needle, reset spring, needle fixed block and cylinder fixed block;The outside of needle is equipped with cylinder and is installed, one end of the cylinder is fixedly provided with cylinder fixed block, one end of the needle passes through cylinder and cylinder fixed block and is connected with needle fixed block, the needle fixed block is fixedly connected with slider body, and needle fixed block and cylinder fixed block are slidably connected, the slider body is set to sliding guide groove corresponding cylinder fixed block;The outside of cylinder is equipped with reset spring and is installed, one end of the reset spring is abutted with cylinder fixed block, and other end is abutted with the outer diameter of BOSS column.The utility model perfectly realizes the inside and outside diameter demolding of BOSS column, solves the problem of appearance quality and break, with good practicality.

Description

Technical Field

[0001] This utility model belongs to the technical field of plastic molds, and specifically relates to a high-efficiency demolding slider for plastic molds. Background Technology

[0002] The automotive sub-instrument assembly refers to the control and storage platform located between the driver and passenger seats. It is usually made using injection molding. With the rapid development of the automotive industry, the quality requirements for the plastic parts of the automotive sub-instrument assembly are also getting higher and higher, which requires the continuous updating and improvement of the injection molding process. Existing plastic molds for automotive auxiliary instrument products often use sliders for demolding. For example, the existing patent CN215791529U discloses a synchronous core-pulling mechanism and mold for inner and outer undercut sliders, which relates to the field of plastic mold technology. It includes an inclined guide post, a moving mold slider, and a reversing slider assembly. The inclined guide post is set on a fixed mold plate. The moving mold slider is set in a groove of the moving mold plate and has a mating part A for molding the undercut of the A side of the product. An inclined hole is provided on the moving mold slider. When the mold is closed, the inclined guide post can be pressed into the inclined hole, and when the mold is opened, it can drive the moving mold slider to move in the X direction, so that the mating part A can be pulled away from the undercut of the A side of the product. The reversing slider assembly is fixedly connected to the moving mold slider. The reversing slider assembly has a mating part B for molding the undercut of the B side of the product, so that when the moving mold slider moves in the X direction, it can drive the mating part B to be pulled away from the undercut of the B side of the product.

[0003] However, for plastic products with appearance requirements on side A and lateral boss pillars and ribs on side B, if existing sliders are used for demolding on the mold, the clamping force of the lateral boss pillars on side B is relatively large, which can easily cause shrinkage marks on the appearance surface. This is especially true if side A of the product requires painting, as the stress will be released after painting, making the defects more obvious and resulting in an unacceptable product appearance. Secondly, the boss pillars are also prone to breakage, and the product lacks functional features, thus requiring it to be scrapped. Utility Model Content

[0004] The purpose of this invention is to provide a high-efficiency demolding slider for plastic molds, aiming to solve the aforementioned problems. This invention not only solves the problems of appearance quality and structural strength fracture caused by the BOSS pillar in the slider, but also features a compact, small, and stable structure.

[0005] This utility model is mainly achieved through the following technical solutions:

[0006] A high-efficiency demolding slider for plastic molds includes a slider body and a reverse ejection mechanism. The reverse ejection mechanism is provided on the side of the slider body near the mold boss. The reverse ejection mechanism includes an ejector sleeve, an ejector pin, a return spring, an ejector pin fixing block, and an ejector sleeve fixing block. An ejector sleeve is sleeved on the outside of the ejector pin. An ejector sleeve fixing block is fixedly provided at one end of the ejector sleeve. One end of the ejector pin passes through the ejector sleeve and the ejector sleeve fixing block and is connected to the ejector pin fixing block. The ejector pin fixing block is fixedly connected to the slider body and slidably connected to the ejector sleeve fixing block. A sliding guide groove is provided on the slider body corresponding to the ejector sleeve fixing block. A return spring is sleeved on the outside of the ejector sleeve, and one end of the return spring abuts against the ejector sleeve fixing block.

[0007] The return spring is mounted on the ejector sleeve and is assembled with the ejector sleeve fixing block in the slider part. During the mold closing stage, the return spring is compressed under the action of external force, accumulating elastic potential energy. When the mold enters the mold opening process, the return spring relies on its own elastic restoring force to resist the ejector sleeve fixing block, thereby generating a thrust to drive the ejector pin to pop out quickly, effectively overcoming the undercut structure of the product and achieving smooth demolding. After demolding, the return spring is not completely relaxed, but retains a preload of 5mm. The key to this design is to maintain the return spring's elastic response capability at all times, avoid stroke failure due to overstretching, and ensure stable functioning in subsequent cycles.

[0008] To better realize this utility model, the sleeve fixing block is further provided with a U-shaped groove on the side near the slider body, one end of the ejector pin passes through the sleeve and the sleeve fixing block and extends into the U-shaped groove, and the ejector pin fixing block is slidably connected to the U-shaped groove.

[0009] To better realize this utility model, the middle part of the needle fixing block is slidably connected to the U-shaped groove, and the two ends of the needle fixing block are respectively fixedly connected to the slider body by locking screws.

[0010] To better realize this utility model, the slider body is further provided with a cross-shaped sliding guide groove corresponding to the needle fixing block and the sleeve fixing block.

[0011] To better realize this utility model, the cup head of the needle is further engaged with the T-slot of the needle fixing block.

[0012] To better realize this utility model, one side of the sleeve fixing block is further engaged with the cup head of the sleeve.

[0013] The beneficial effects of this utility model are as follows:

[0014] This invention enables the BOSS column's outer diameter to be ejected in the reverse direction when the slider retracts. When the slider retracts to the height of the BOSS column, it then drives the ejector sleeve to achieve final inverted demolding, perfectly realizing the demolding of the inner and outer diameters of the BOSS column. This solves the problems of appearance quality and breakage, and has good practicality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the high-efficiency demolding slider for plastic molds according to this utility model;

[0016] Figure 2 for Figure 1 The main view;

[0017] Figure 3 This is a schematic diagram of the reverse ejection mechanism;

[0018] Figure 4 for Figure 3 The main view;

[0019] Figure 5 for Figure 4 Sectional view of AA;

[0020] Figure 6 for Figure 4 Sectional view of BB;

[0021] Figure 7 This is a perspective structural diagram of the reverse ejection mechanism;

[0022] Figure 8 A perspective view of the needle maker and the needle maker fixing block;

[0023] Figure 9 This is a diagram showing the working state of the reverse ejection mechanism.

[0024] Wherein: 1-slider body, 2-reverse ejection mechanism, 21-sleeve, 22-spin, 23-reset spring, 24-spin fixing block, 25-sleeve fixing block, 3-sliding guide groove. Detailed Implementation

[0025] Example 1:

[0026] A high-efficiency demolding slider for plastic molds, such as Figures 1-6As shown, the device includes a slider body 1 and a reverse ejection mechanism 2. The reverse ejection mechanism 2 is installed on the side of the slider body 1 near the BOSS post. The reverse ejection mechanism 2 includes a sleeve 21, a ejector pin 22, a return spring 23, an ejector pin fixing block 24, and a sleeve fixing block 25. The sleeve fixing block 25 is fixedly installed at one end of the sleeve 21. The return spring 23 is sleeved on the outer side of the sleeve 21, and one end of the return spring 23 abuts against the sleeve fixing block 25. The return spring 23 is used to reset the sleeve 21. One end of the ejector pin 22 passes through the sleeve 21 and the sleeve fixing block 25 and is connected to the ejector pin fixing block 24. The ejector pin fixing block 24 is fixedly connected to the slider body 1, and the ejector pin fixing block 24 is slidably connected to the sleeve fixing block 25. The slider body 1 is provided with a sliding guide groove 3 corresponding to the sleeve fixing block 25. Preferably, the sleeve fixing block 25 is provided with a U-shaped groove on the side near the slider body 1, one end of the ejector pin 22 passes through the sleeve 21 and the sleeve fixing block 25 and extends into the U-shaped groove, and the ejector pin fixing block 24 is slidably connected to the U-shaped groove.

[0027] Specifically, the ejector pin fixing block 24 is locked onto the slider body 1, and the ejector sleeve fixing block 25 moves relative to the slider body 1, with the ejector sleeve fixing block 25 experiencing friction on the slider body 1. The cup head of the ejector pin 22 is secured to the ejector pin fixing block 24 via a T-slot, and the ejector sleeve 21 is mounted on the ejector sleeve fixing block 25 and moves along with it. The return spring 23 is mounted on the ejector sleeve 21 and abuts against the ejector sleeve fixing block 25, serving to reset the ejector sleeve 21.

[0028] Preferably, such as Figure 7 and Figure 8 As shown, the cup head of the ejector pin 22 is engaged with the T-slot of the ejector pin fixing block 24. One side of the ejector sleeve fixing block 25 is engaged with the cup head of the ejector sleeve 21.

[0029] During installation, such as Figures 7-9 As shown, one end of the ejector pin 22 is fitted onto the ejector pin fixing block 24, and then the ejector sleeve fixing block 25 is secured to the cup head of the ejector sleeve 21. The other end of the ejector pin 22 passes through the ejector sleeve 21, and the ejector pin fixing block 24 is fixed to the slider body 1. When the inclined guide post drives the slider body 1 to move backward, it drives the ejector pin fixing block 24 and the ejector pin 22 to move together, and the ejector sleeve fixing block 25 moves relative to the slider body 1. The straight position of the ejector sleeve fixing block 25 ensures that the ejector sleeve 21 does not move backward. After the ejector pin 22 is demolded, the straight position of the ejector sleeve fixing block 25 loses its function, and the return spring 23 starts to drive the ejector sleeve fixing block 25 to move the ejector sleeve 21 backward together, ultimately playing a role in preventing the BOSS column from sticking to its inner and outer diameters.

[0030] like Figure 1As shown, this invention features a straight section between the back of the ejector sleeve fixing block 25 and the shovel base, ensuring that the ejector sleeve 21 remains stationary during the slide block's retraction. When the ejector pin 22 retracts with the slide block to the full height of the BOSS column, the straight section between the back of the ejector sleeve fixing block 25 and the shovel base has disengaged. At this point, the return spring 23 can be used to disengage the ejector sleeve 21 from the outer diameter of the BOSS column, thus achieving demolding with force applied to both the inner and outer diameters of the BOSS column. This prevents the BOSS column from breaking or causing shrinkage marks and scratches on the corresponding outer surface. This structure requires installation after the slide block has been properly fitted. For ease of fitting, the ejector sleeve fixing block 25, ejector sleeve 21, and spring should be installed first, and the ejector pin 22 should ideally be inserted into the ejector pin fixing block 24 and then installed inside the ejector sleeve 21.

[0031] This utility model is compact yet plays a significant role, occupying little space, easy to install, and convenient for later maintenance and repair. Conventional slide block BOSS column demolding typically uses ejector pins for assisted demolding, but this easily leaves ejector pin marks on the exterior surface, and the BOSS column is also prone to tearing. This solution reduces the need for auxiliary ejection mechanisms, directly utilizing the BOSS design with 21 ejector pins, and incorporating reverse ejection on these pins. This ensures both appearance quality and eliminates the risk of breakage due to strength, significantly reducing product scrap rates and saving on manual polishing processes needed to maintain appearance quality.

[0032] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A high-efficiency demolding slider for plastic molds, characterized in that, The system includes a slider body (1) and a reverse ejection mechanism (2). The reverse ejection mechanism (2) is provided on the side of the slider body (1) near the mold BOSS pillar. The reverse ejection mechanism (2) includes a sleeve (21), a ejector pin (22), a return spring (23), an ejector pin fixing block (24), and a sleeve fixing block (25). The sleeve (21) is sleeved on the outside of the ejector pin (22). The sleeve fixing block (25) is fixedly provided at one end of the sleeve (21). One end of the tube passes through the sleeve (21) and the sleeve fixing block (25) and is connected to the needle fixing block (24). The needle fixing block (24) is fixedly connected to the slider body (1), and the needle fixing block (24) is slidably connected to the sleeve fixing block (25). The slider body (1) is provided with a sliding guide groove (3) corresponding to the sleeve fixing block (25). A return spring (23) is sleeved on the outside of the sleeve (21), and one end of the return spring (23) abuts against the sleeve fixing block (25).

2. The high-efficiency demolding slider for plastic molds according to claim 1, characterized in that, The sleeve fixing block (25) is provided with a U-shaped groove on the side near the slider body (1). One end of the screw (22) passes through the sleeve (21) and the sleeve fixing block (25) and extends into the U-shaped groove. The screw fixing block (24) is slidably connected to the U-shaped groove.

3. The high-efficiency demolding slider for plastic molds according to claim 2, characterized in that, The middle part of the needle fixing block (24) is slidably connected to the U-shaped groove, and the two ends of the needle fixing block (24) are respectively fixedly connected to the slider body (1) by locking screws.

4. The high-efficiency demolding slider for plastic molds according to claim 3, characterized in that, The slider body (1) is provided with a cross-shaped sliding guide groove (3) corresponding to the needle fixing block (24) and the sleeve fixing block (25).

5. The high-efficiency demolding slider for plastic molds according to claim 1, characterized in that, The cup head of the needle (22) is engaged with the T-slot of the needle fixing block (24).

6. A high-efficiency demolding slider for plastic molds according to claim 1 or 5, characterized in that, One side of the sleeve fixing block (25) is engaged with the cup head of the sleeve (21).

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