Ejector sleeve lengthening rod mechanism

Abstract

The utility model discloses an ejector sleeve extension bar mechanism, which relates to the field of injection molding equipment, and comprises a lower mold seat plate and an ejector pin, one end of the ejector pin is fixedly connected with the lower mold seat plate, the ejector pin is sleeved in an ejector sleeve extension bar, the tail end of the ejector sleeve extension bar is connected with an ejector sleeve, and the ejector sleeve extension bar is connected with the lower mold seat plate. And the ejector sleeve lengthening rod and the ejector sleeve are inserted into the mold core. And compared with the prior art, the contact surface between the mechanism and the mold is large, and the heat productivity of friction is large. According to the utility model, the main length of the ejector pin is coated by the ejector sleeve lengthening rod, the ejector sleeve lengthening rod plays a role of an ejector sleeve, the tail end of the ejector sleeve lengthening rod is connected with the ejector sleeve, the wall thickness of the ejector sleeve lengthening rod is greater than that of the ejector sleeve, the ejector sleeve lengthening rod is more wear-resistant, and the contact part of the ejector sleeve and the mold core is short in length, small in heat and small in damage to the service life of the ejector sleeve. And the ejector sleeve lengthening rod is also mainly only contacted with the lengthening rod sliding sleeve, so that the frictional contact area is small, and the heat productivity is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection molding equipment field, concretely relates to a kind of plunger rod mechanism for taking out or ejecting molding product in injection molding equipment. BACKGROUND

[0002] Injection molding is also called injection molding, which is a kind of injection molding method. The advantage of injection molding method is fast production speed and high efficiency. Injection molding is suitable for mass production and complex shape product forming processing field. For the finished plastic product of injection molding, the finished product is generally ejected by plunger and plunger needle. However, for large mold, the length of the mold is longer, and the plunger needle also needs to be longer to pass through the core to eject the finished product. However, the plunger is generally a standard part, and the length will not be longer. The long plunger wall is thin, and the long distance and time friction will heat the plunger, reducing the service life of the plunger. Therefore, a long tube is needed to connect the plunger to extend the length of the plunger that can be inserted into the core.

[0003] In the prior art, although there is a way to extend the plunger, such as the "center needle fixing device of injection molding mold" disclosed in the announcement No. CN206999547U, which includes a center needle, a lengthening seat, a plunger, a fixed plate, a fixed block, a pressing plate and a cover plate. The lengthening seat includes a lengthening seat body, a T-shaped groove and a hollow groove. The T-shaped groove is located at one end of the lengthening seat body, and the hollow groove is arranged along the length direction of the lengthening seat body and penetrates through the lengthening seat body. The center needle is installed through the hollow groove and the T-shaped groove. The bottom of the plunger is fixed in the T-shaped groove, and the center needle passes through the plunger. The fixed plate has a fixed plate through hole, and the fixed plate is fixed to the other end of the lengthening seat through the fixed plate through hole. The fixed block includes a fixed block body, a fixed block through hole and a fixed block mounting groove. The pressing plate is accommodated in the fixed block through hole, and the center needle passes through the pressing plate through hole. The cover plate is accommodated in the fixed block mounting groove, and the pressing plate is fixed to the cover plate. The end of the center needle is fixed by the cooperation of the pressing plate and the cover plate. However, the length of the center needle is short, which is easy to break, and the length of the plunger in contact with the inner wall of the mold is large. In the production process, long time friction can reduce the service life of the plunger. UTILITY MODEL CONTENTS

[0004] The utility model aims to install the plunger by plunger lengthening rod, and provides a plunger lengthening rod mechanism that can normally eject finished products in large molds. Another object of the utility model is to reduce the friction between the plunger and the core during the working process of the plunger lengthening rod mechanism, and to prolong the service life of the plunger. The further object of the utility model is to reduce the friction between the plunger lengthening rod and the inner wall of the mold by the sleeve, prolong the service life of the whole device, make the movement of the whole mechanism more smooth, and improve the ejection efficiency.

[0005] The utility model is achieved by the following technical means.

[0006] An extender sleeve mechanism includes a lower mold base plate and at least two ejector pins. One end of each ejector pin is fixedly connected to the lower mold base plate. The ejector pin is sleeved in an extender sleeve, and the end of the extender sleeve is connected to an ejector sleeve. The extender sleeve and the ejector sleeve are inserted into a core.

[0007] Furthermore, a bottom needle plate and a top needle plate are provided below the lower mold base plate, and the lower end surface of the bottom needle plate mates with the upper end surface of the top needle plate.

[0008] The needle passes through the bottom needle plate and the top needle plate. The extension rod of the needle sleeve is fixedly installed with the top needle plate, and the upper end face of the extension rod of the needle sleeve mates with the lower end face of the bottom needle plate.

[0009] Preferably, at the mating position between the core and the extension rod, a core stepped groove is provided on the upper end face of the core. The upper part of the opening of the core stepped groove is a large-diameter groove and the lower part is a small-diameter groove. An extension rod sliding sleeve is provided at the small-diameter groove of the core stepped groove, and the extension rod sliding sleeve mates with the extension rod.

[0010] Furthermore, the extended rod sliding sleeve is located within the small diameter of the core stepped groove and mates with the inner wall of the core stepped groove. The upper end face of the extended rod sliding sleeve is located at the junction of the large and small diameter grooves of the core stepped groove.

[0011] Preferably, a fixing screw mounting groove is provided on one side of the large diameter groove of the core stepped groove. The fixing screw mounting groove is fixed with the sleeve fixing screw, and the upper part of the sleeve fixing screw presses on the extension rod sliding sleeve.

[0012] Furthermore, the extension rod of the ejector sleeve is a hollow tube structure, the hollow part of which cooperates with the ejector needle, and an extension rod slot is provided at the end of the extension rod, the extension rod slot extending from the outside to the hollow part of the extension rod.

[0013] Furthermore, the upper part of the slotted extension rod is the large diameter slot, the lower part of the slotted extension rod is the small diameter slot, the opening width of the large diameter slot is greater than the diameter of the hollow part, the opening width of the small diameter slot is equal to the diameter of the hollow part, the upper part of the sleeve is inserted into the large diameter slot, and the lower part of the sleeve extends to the bottom of the core.

[0014] Furthermore, the core is provided with an extension rod groove that runs through the core and is installed in conjunction with the extension rod of the ejector sleeve. The outer diameter of the extension rod of the ejector sleeve is close to the inner diameter of the extension rod groove. The extension rod groove is provided with a groove conical bottom near the bottom of the core. The inner diameter of the extension rod groove below the groove conical bottom is close to that of the ejector sleeve.

[0015] Preferably, the core is provided with a plurality of extension rod grooves, the inner diameter of each extension rod groove is not necessarily the same, and each extension rod groove is engaged with the screw.

[0016] Furthermore, the end of the core is the product, which covers the opening of the extension rod groove.

[0017] This invention has the following benefits:

[0018] Compared to the comparative technology, which has a large contact area between the mechanism and the mold, resulting in significant heat generation from friction, this invention features an extended ejector sleeve that encloses the main length of the ejector pin, effectively functioning as an ejector sleeve. The extended sleeve connects to the ejector sleeve at its end. The extended sleeve has a thicker wall than the ejector sleeve, making it more wear-resistant. Furthermore, the shorter contact area between the ejector sleeve and the core results in less heat generation and less damage to the ejector sleeve's lifespan. Additionally, the extended sleeve primarily contacts the extended sleeve sliding sleeve, resulting in a small frictional contact area and reduced heat generation. Attached Figure Description

[0019] Figure 1 This is the front view of the present invention.

[0020] Figure 2 This is a side sectional view of the present invention.

[0021] Figure 3 for Figure 2 Enlarged view of part A in the middle.

[0022] Figure 4 This is a top sectional view of the present invention.

[0023] Figure 5 for Figure 4 Enlarged view of section B in the middle.

[0024] Figure 6 This is a front sectional view of the present invention.

[0025] Figure 7 for Figure 6 Enlarged view of section C.

[0026] In the diagram, 1-lower mold base plate, 2-spinner, 3-bottom pin plate, 4-face pin plate, 5-core, 6-extended sleeve rod, 7-spinner, 8-extended sleeve groove, 9-extended sleeve sliding sleeve, 10-sleeve fixing screw, 11-core stepped groove, 12-extended sleeve slot, 13-large diameter of slot, 14-small diameter of slot, 15-conical bottom of groove, 16-fixing screw mounting slot, 17-product. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0028] Example 1:

[0029] like Figures 1 to 7 As shown, a sleeve extension rod mechanism includes a lower mold base plate 1 and a sleeve pin 2. One end of the sleeve pin 2, specifically the top end of the sleeve pin 2, is fixedly connected to the lower mold base plate 1. The fixed connection between the top end of the sleeve pin 2 and the lower mold base plate 1 is located at the upper end of the lower mold base plate 1. The lower mold base plate 1 has a cuboid structure. At the position where the sleeve pin 2 mates, a groove is provided on the lower mold base plate 1, and the bottom of the groove is installed with the top end of the sleeve pin 2.

[0030] For large molds, the products that are injection molded in one go often have complex surface structures, many undulations, and a large surface area. Therefore, the lower mold base 1 needs to be equipped with more ejector pins 2, ejector sleeves 7, and ejector sleeve extension rods 6 to improve the demolding efficiency of the product 17. Therefore, the core 5 is also equipped with more holes for installation with ejector pins 2, ejector sleeves 7, and ejector sleeve extension rods 6. Therefore, in fact, at least two ejector pins are provided on one core 5 for ejecting the product 17.

[0031] The main body of the ejector pin 2 is a slender rod-shaped structure with a uniform diameter. The width of the top end of the ejector pin 2 is greater than the diameter of the main body. The top end of the ejector pin 2 is positioned at the center of the bottom of a groove in the lower mold base plate 1. A fixing block is located above the ejector pin 2 in the groove, fitting snugly within the groove. The fixing block and the lower mold base plate 1 are connected by bolts, securing the fixing block to the lower mold base plate 1 and thus pressing down the ejector pin 2, preventing it from moving or rotating relative to the lower mold base plate 1.

[0032] The ejector pin 2 is fitted into the ejector sleeve extension rod 6, the end of which is connected to the ejector sleeve 7. The ejector sleeve extension rod 6 and the ejector sleeve are inserted into the core 5. Below the lower mold base plate 1, from top to bottom, are respectively provided a bottom pin plate 3 and a top pin plate 4. The ejector pin 2 passes through the bottom pin plate 3 and the top pin plate 4 in sequence. The bottom pin plate 3 and the top pin plate 4 are fitted together and fixedly connected.

[0033] If there is relative movement between the bottom needle plate 3 and the top needle plate 4, because the needle 2 is long but has a small rod diameter, it is easy for it to collide with the bottom needle plate 3 or the top needle plate 4 due to the relative movement between the bottom needle plate 3 and the top needle plate 4. This can cause the rod of the needle 2 to bend and deform, making it impossible for the needle 2 to move inside the mold, damaging the needle 2 or even rendering the mold unusable.

[0034] A bottom pin plate 3 and a top pin plate 4 are provided below the lower mold base plate 1. The lower end face of the bottom pin plate 3 is fixedly installed in conjunction with the upper end face of the top pin plate 4. The ejector sleeve extension rod 6 is installed in the top pin plate 4 and inserted into the core 5. The ejector sleeve extension rod 6 is a hollow tubular structure with a large outer diameter. The diameter of the hollow part is similar to, but slightly larger than, the diameter of the ejector pin 2. The axis of the outer wall of the ejector sleeve extension rod 6 is collinear with the axis of the hollow part and also with the axis of the rod part of the ejector pin 2.

[0035] The fixed position of the extension rod 6 on the face needle plate 4 is specifically at the junction of the bottom needle plate 3 and the face needle plate 4. The diameter of the ring at the top of the extension rod 6 is larger than the diameter of the main lower part of the extension rod 6, thus it is locked in the upper part of the face needle plate 4. The upper surface of the extension rod 6 is flush with the upper surface of the face needle plate 4. The bottom needle plate 3 presses against the upper surface of the face needle plate 4 and the upper surface of the extension rod 6, so that the extension rod 6 is fixedly installed on the face needle plate 4 and cannot move relative to the face needle plate 4.

[0036] Furthermore, because the distance between the lower mold base plate 1, the bottom pin plate 3, and the top pin plate 4 is very small, the relative displacement between the lower mold base plate 1 and the bottom pin plate 3 and the top pin plate 4 is very small when ejecting the product 17. Also, because the ejector pin 2 is fixed to the lower mold base plate 1, and the ejector sleeve extension rod 6 is fixed to the top pin plate 4, the relative displacement between the ejector pin 2 and the ejector sleeve extension rod 6 is very small. Therefore, when ejecting the product 17, the friction between the ejector pin 2 and the ejector sleeve extension rod 6 is low, wear is less likely to occur, and the service life of the ejector pin 2 is longer.

[0037] The ejector pin 2 passes through the bottom needle plate 3 and the top needle plate 4. The ejector sleeve extension rod 6 is fixedly installed with the top needle plate 4, and the upper end face of the ejector sleeve extension rod 6 mates with the lower end face of the bottom needle plate 3. A core 5 is located below the top needle plate 4, and the end of the core 5 is where the product 17 is formed. An extension rod groove 8 is provided in the middle of the core 5, and the ejector sleeve extension rod 6 is inserted into the core 5 through the extension rod groove 8. The ejector sleeve extension rod 6 can slide up and down relative to the core 5 in the extension rod groove 8. The outer diameter of the ejector sleeve extension rod 6 is smaller than the diameter of the extension rod groove 8, and the ejector sleeve extension rod 6 generally does not rub or contact the inner wall of the extension rod groove 8 of the core 5 when sliding in the extension rod groove 8.

[0038] At the mating installation point of the core 5 and the sleeve extension rod 6, specifically at the position on the upper end face of the core 5, a core stepped groove 11 is provided inside the core 5. The core stepped groove 11 is a groove with a stepped hole structure. The core stepped groove 11 has a structure that is larger at the top and smaller at the bottom. In the upper part of the opening of the core stepped groove 11, the groove with the larger diameter is the large-diameter groove, and the lower part is the small-diameter groove. Therefore, the upper part of the core stepped groove 11 is the large-diameter groove, and the lower part is the small-diameter groove.

[0039] An extension rod sliding sleeve 9 is provided at the small diameter groove of the core stepped groove 11. The extension rod sliding sleeve 9 is installed in the core stepped groove 11, specifically in the small diameter groove of the core stepped groove 11. The extension rod sliding sleeve 9 is preferably fixedly installed in the core stepped groove 11. Specifically, the extension rod sliding sleeve 9 and the small diameter groove are interference-fitted, which can fix the extension rod sliding sleeve 9 inside the core 5 and prevent relative movement between the extension rod sliding sleeve 9 and the core 5.

[0040] The extension rod sliding sleeve 9 mates with the sleeve extension rod 6. The diameter of the small diameter groove is larger than the diameter of the main part of the extension rod slide groove 8, so the sleeve extension rod 6 will not fall into the extension rod slide groove 8.

[0041] The extended rod sliding sleeve 9 is located within the small diameter of the core stepped groove 11 and mates with the inner wall of the core stepped groove 11. The upper end face of the extended rod sliding sleeve 9 is located at the junction of the large and small diameter grooves of the core stepped groove 11.

[0042] On one side of the large-diameter groove of the core stepped groove 11, a fixing screw mounting groove 16 extends outward. A sleeve fixing screw 10 is fixedly installed in the fixing screw mounting groove 16, and the sleeve fixing screw 10 is installed in the core 5. The upper part of the sleeve fixing screw 10 can be cylindrical or frustum-shaped, requiring that the upper part of the sleeve fixing screw 10 partially overlaps with the upper surface of the extension rod sliding sleeve 9, thereby pressing on the extension rod sliding sleeve 9. The sleeve fixing screw 10 can further fix the extension rod sliding sleeve 9, making it firmly installed inside the core 5.

[0043] The inner diameter of the extended rod sliding sleeve 9 is close to that of the ejector extended rod 6. When the ejector extended rod 6 moves within the core 5, it mainly contacts the inner wall of the extended rod sliding sleeve 9. The extended rod sliding sleeve 9 also guides the movement of the ejector extended rod 6. Moreover, because the length of the extended rod sliding sleeve 9 is relatively small, the contact area between the extended rod sliding sleeve 9 and the ejector extended rod 6 is small when the ejector extended rod 6 moves, resulting in less heat generated by friction, less wear on the ejector extended rod 6, a longer service life, and more precise movement of the ejector extended rod 6, leading to high ejection efficiency.

[0044] The extension rod 6 is a hollow tube structure, and the hollow part cooperates with the needle 2. An extension rod slot 12 is provided at the end of the extension rod 6, and the extension rod slot 12 extends from the outside to the hollow part of the extension rod 6.

[0045] The upper part of the extended rod slot 12 is the large diameter slot 13, and the lower part of the extended rod slot 12 is the small diameter slot 14. The opening width of the large diameter slot 13 is greater than the diameter of the hollow part, and the opening width of the small diameter slot 14 is equal to the diameter of the hollow part. The upper part of the sleeve 7 is inserted into the large diameter slot 13, and the lower part of the sleeve 7 extends to the bottom of the core 5.

[0046] The core 5 has an extension rod groove 8 that runs through it and is installed in conjunction with the sleeve extension rod 6. The outer diameter of the sleeve extension rod 6 is close to the inner diameter of the extension rod groove 8. The extension rod groove 8 has a groove conical bottom 15 near the bottom of the core 5. The inner diameter of the extension rod groove 8 below the groove conical bottom 15 is close to that of the sleeve 7.

[0047] The core 5 is provided with a plurality of extension rod grooves 8, the inner diameter of each extension rod groove 8 is not necessarily the same, and each extension rod groove 8 is engaged with the needle 2.

[0048] Furthermore, the end of the core 5 is a product 17, which covers the opening of the extension rod groove 8.

[0049] Example 2:

[0050] The structure of this embodiment is similar to that of Embodiment 1. This embodiment will specifically describe how the sleeve extension rod mechanism is driven.

[0051] like Figures 1 to 7As shown, a sleeve extension rod mechanism includes a lower mold base plate 1 and a sleeve pin 2. One end of the sleeve pin 2, specifically the top end of the sleeve pin 2, is fixedly connected to the lower mold base plate 1. The fixed connection between the top end of the sleeve pin 2 and the lower mold base plate 1 is located at the upper end of the lower mold base plate 1. The lower mold base plate 1 has a cuboid structure. At the position where the sleeve pin 2 mates, a groove is provided on the lower mold base plate 1, and the top end of the sleeve pin 2 is installed at the center of the bottom of the groove.

[0052] The main body of the ejector pin 2 is a slender rod-shaped structure with a uniform diameter. The width of the top end of the ejector pin 2 is greater than the diameter of the main body. The top end of the ejector pin 2 is positioned at the center of the bottom of a groove in the lower mold base plate 1. A fixing block is located above the ejector pin 2 in the groove, fitting snugly within the groove. The fixing block and the lower mold base plate 1 are connected by bolts, securing the fixing block to the lower mold base plate 1 and thus pressing down the ejector pin 2, preventing it from moving or rotating relative to the lower mold base plate 1.

[0053] The ejector pin 2 is fitted into the ejector sleeve extension rod 6, the end of which is connected to the ejector sleeve 7. The ejector sleeve extension rod 6 and the ejector sleeve are inserted into the core 5. Below the lower mold base plate 1, from top to bottom, are respectively provided a bottom pin plate 3 and a top pin plate 4. The ejector pin 2 passes through the bottom pin plate 3 and the top pin plate 4 in sequence. The bottom pin plate 3 and the top pin plate 4 are fitted together and fixedly connected.

[0054] If there is relative movement between the bottom needle plate 3 and the top needle plate 4, because the needle 2 is long but has a small rod diameter, it is easy for it to collide with the bottom needle plate 3 or the top needle plate 4 due to the relative movement between the bottom needle plate 3 and the top needle plate 4. This can cause the rod of the needle 2 to bend and deform, making it impossible for the needle 2 to move inside the mold, damaging the needle 2 or even rendering the mold unusable.

[0055] A bottom pin plate 3 and a top pin plate 4 are provided below the lower mold base plate 1. The lower end face of the bottom pin plate 3 is fixedly installed in conjunction with the upper end face of the top pin plate 4. The ejector sleeve extension rod 6 is installed in the top pin plate 4 and inserted into the core 5. The ejector sleeve extension rod 6 is a hollow tubular structure with a large outer diameter. The diameter of the hollow part is similar to, but slightly larger than, the diameter of the ejector pin 2. The axis of the outer wall of the ejector sleeve extension rod 6 is collinear with the axis of the hollow part and also with the axis of the rod part of the ejector pin 2.

[0056] The fixed position of the extension rod 6 on the face needle plate 4 is specifically at the junction of the bottom needle plate 3 and the face needle plate 4. The diameter of the ring at the top of the extension rod 6 is larger than the diameter of the main lower part of the extension rod 6, thus it is locked in the upper part of the face needle plate 4. The upper surface of the extension rod 6 is flush with the upper surface of the face needle plate 4. The bottom needle plate 3 presses against the upper surface of the face needle plate 4 and the upper surface of the extension rod 6, so that the extension rod 6 is fixedly installed on the face needle plate 4 and cannot move relative to the face needle plate 4.

[0057] Furthermore, because the distance between the lower mold base plate 1, the bottom pin plate 3, and the top pin plate 4 is very small, the relative displacement between the lower mold base plate 1 and the bottom pin plate 3 and the top pin plate 4 is very small when ejecting the product 17. Also, because the ejector pin 2 is fixed to the lower mold base plate 1, and the ejector sleeve extension rod 6 is fixed to the top pin plate 4, the relative displacement between the ejector pin 2 and the ejector sleeve extension rod 6 is very small. Therefore, when ejecting the product 17, the friction between the ejector pin 2 and the ejector sleeve extension rod 6 is low, wear is less likely to occur, and the service life of the ejector pin 2 is longer.

[0058] The ejector pin 2 passes through the bottom needle plate 3 and the top needle plate 4. The ejector sleeve extension rod 6 is fixedly installed with the top needle plate 4, and the upper end face of the ejector sleeve extension rod 6 mates with the lower end face of the bottom needle plate 3. A core 5 is located below the top needle plate 4, and the end of the core 5 is where the product 17 is formed. An extension rod groove 8 is provided in the middle of the core 5, and the ejector sleeve extension rod 6 is inserted into the core 5 through the extension rod groove 8. The ejector sleeve extension rod 6 can slide up and down relative to the core 5 in the extension rod groove 8. The outer diameter of the ejector sleeve extension rod 6 is smaller than the diameter of the extension rod groove 8, and the ejector sleeve extension rod 6 generally does not rub or contact the inner wall of the extension rod groove 8 of the core 5 when sliding in the extension rod groove 8.

[0059] At the mating installation point of the core 5 and the sleeve extension rod 6, specifically at the position on the upper end face of the core 5, a core stepped groove 11 is provided inside the core 5. The core stepped groove 11 is a groove with a stepped hole structure. The core stepped groove 11 has a structure that is larger at the top and smaller at the bottom. In the upper part of the opening of the core stepped groove 11, the groove with the larger diameter is the large-diameter groove, and the lower part is the small-diameter groove. Therefore, the upper part of the core stepped groove 11 is the large-diameter groove, and the lower part is the small-diameter groove.

[0060] An extension rod sliding sleeve 9 is provided at the small diameter groove of the core stepped groove 11. The extension rod sliding sleeve 9 is installed in the core stepped groove 11, specifically in the small diameter groove of the core stepped groove 11. The extension rod sliding sleeve 9 is preferably fixedly installed in the core stepped groove 11. Specifically, the extension rod sliding sleeve 9 and the small diameter groove are interference-fitted, which can fix the extension rod sliding sleeve 9 inside the core 5 and prevent relative movement between the extension rod sliding sleeve 9 and the core 5.

[0061] The extension rod sliding sleeve 9 mates with the sleeve extension rod 6. The diameter of the small diameter groove is larger than the diameter of the main part of the extension rod slide groove 8, so the sleeve extension rod 6 will not fall into the extension rod slide groove 8.

[0062] The extended rod sliding sleeve 9 is located within the small diameter of the core stepped groove 11 and mates with the inner wall of the core stepped groove 11. The upper end face of the extended rod sliding sleeve 9 is located at the junction of the large and small diameter grooves of the core stepped groove 11.

[0063] On one side of the large-diameter groove of the core stepped groove 11, a fixing screw mounting groove 16 extends outward. A sleeve fixing screw 10 is fixedly installed in the fixing screw mounting groove 16, and the sleeve fixing screw 10 is installed in the core 5. The upper part of the sleeve fixing screw 10 can be cylindrical or frustum-shaped, requiring that the upper part of the sleeve fixing screw 10 partially overlaps with the upper surface of the extension rod sliding sleeve 9, thereby pressing on the extension rod sliding sleeve 9. The sleeve fixing screw 10 can further fix the extension rod sliding sleeve 9, making it firmly installed inside the core 5.

[0064] The inner diameter of the extended rod sliding sleeve 9 is close to that of the ejector extended rod 6. When the ejector extended rod 6 moves within the core 5, it mainly contacts the inner wall of the extended rod sliding sleeve 9. The extended rod sliding sleeve 9 also guides the movement of the ejector extended rod 6. Moreover, because the length of the extended rod sliding sleeve 9 is relatively small, the contact area between the extended rod sliding sleeve 9 and the ejector extended rod 6 is small when the ejector extended rod 6 moves, resulting in less heat generated by friction, less wear on the ejector extended rod 6, a longer service life, and more precise movement of the ejector extended rod 6, leading to high ejection efficiency.

[0065] The extension rod 6 is a hollow tube structure, and the hollow part cooperates with the needle 2. An extension rod slot 12 is provided at the end of the extension rod 6, and the extension rod slot 12 extends from the outside to the hollow part of the extension rod 6.

[0066] The upper part of the extended rod slot 12 is the large diameter slot 13, and the lower part of the extended rod slot 12 is the small diameter slot 14. The opening width of the large diameter slot 13 is greater than the diameter of the hollow part, and the opening width of the small diameter slot 14 is equal to the diameter of the hollow part. The upper part of the sleeve 7 is inserted into the large diameter slot 13, and the lower part of the sleeve 7 extends to the bottom of the core 5.

[0067] The core 5 has an extension rod groove 8 that runs through it and is installed in conjunction with the ejector sleeve extension rod 6. The outer diameter of the ejector sleeve extension rod 6 is close to the inner diameter of the extension rod groove 8. The extension rod groove 8 has a groove conical bottom 15 near the bottom of the core 5. The inner diameter of the extension rod groove 8 below the groove conical bottom 15 is close to that of the ejector sleeve 7. The end of the ejector needle 2 is located inside the ejector sleeve 7. The diameters of both the ejector sleeve 7 and the end of the ejector needle 2 are small, with the diameter of the ejector sleeve 7 being smaller than the diameter of the larger diameter part at the upper end of the ejector needle 2.

[0068] This embodiment takes the fixed lower mold base plate 1 as an example to illustrate how the ejector pin ejects the finished product.

[0069] After injection molding, the core 5 moves towards the ejector plate 4. At this time, the ejector pin 2, which had never been in contact with the product 17, begins to contact it. The ejector pin 2 pushes part of the product 17 away from the core 5. As the core 5 moves further towards the ejector plate, the ejector sleeve extension rod 6 does not move relative to the ejector pin 2, but slides in the extension rod groove 8 and continuously approaches the conical bottom 15 of the groove. The ejector sleeve 7 also continuously moves downward, extending out of the core 5 together with the ejector pin 2. The ejector sleeve extension rod 6 contacts the extension rod sliding sleeve 9, and the extension rod sliding sleeve 9 guides the movement of the ejector sleeve extension rod 6. Finally, the product 17 completely separates from the core 5, completing the ejection process of one product 17.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A sleeve extension rod mechanism, characterized in that, It includes a lower mold base plate (1) and at least two ejector pins (2). One end of the ejector pin (2) is fixedly connected to the lower mold base plate (1). The ejector pin (2) is sleeved in the ejector sleeve extension rod (6). The end of the ejector sleeve extension rod (6) is connected to the ejector sleeve (7). The ejector sleeve extension rod (6) and the ejector sleeve are inserted into the core (5).

2. The sleeve extension rod mechanism according to claim 1, characterized in that, The lower mold base plate (1) is provided with a bottom needle plate (3) and a top needle plate (4), and the lower end face of the bottom needle plate (3) is engaged with the upper end face of the top needle plate (4). The needle (2) passes through the bottom needle plate (3) and the top needle plate (4), the extension rod (6) is fixedly installed with the top needle plate (4), and the upper end face of the extension rod (6) is engaged with the lower end face of the bottom needle plate (3).

3. The sleeve extension rod mechanism according to claim 1, characterized in that, At the mating position of the core (5) and the sleeve extension rod (6), a core stepped groove (11) is provided on the upper end face of the core (5). The upper part of the opening of the core stepped groove (11) is a large diameter groove and the lower part is a small diameter groove. An extension rod sliding sleeve (9) is provided at the small diameter groove of the core stepped groove (11). The extension rod sliding sleeve (9) is mated with the sleeve extension rod (6).

4. The sleeve extension rod mechanism according to claim 3, characterized in that, The extended rod sliding sleeve (9) is located inside the small diameter of the core stepped groove (11) and cooperates with the inner wall of the core stepped groove (11). The upper end face of the extended rod sliding sleeve (9) is located at the junction of the large and small diameter grooves of the core stepped groove (11).

5. The sleeve extension rod mechanism according to claim 3, characterized in that, A fixing screw mounting groove (16) is provided on one side of the large diameter groove of the core stepped groove (11). The fixing screw mounting groove (16) is fixed with the sleeve fixing screw (10). The upper part of the sleeve fixing screw (10) presses on the extension rod sliding sleeve (9).

6. A sleeve extension rod mechanism according to claim 1, 2, 3, 4, or 5, characterized in that, The extension rod (6) is a hollow tube structure. The hollow part is matched with the needle (2). An extension rod slot (12) is provided at the end of the extension rod (6). The extension rod slot (12) extends from the outside to the hollow part of the extension rod (6).

7. The sleeve extension rod mechanism according to claim 6, characterized in that, The upper part of the extended rod slot (12) is the large diameter slot (13), and the lower part of the extended rod slot (12) is the small diameter slot (14). The opening width of the large diameter slot (13) is greater than the diameter of the hollow part, and the opening width of the small diameter slot (14) is equal to the diameter of the hollow part. The upper part of the sleeve (7) is inserted into the large diameter slot (13), and the lower part of the sleeve (7) extends to the bottom of the core (5).

8. A sleeve extension rod mechanism according to claim 1, 2, 3, 4, 5, or 7, characterized in that, The core (5) is provided with an extension rod groove (8) that runs through the core (5) and is installed in conjunction with the sleeve extension rod (6). The outer diameter of the sleeve extension rod (6) is close to the inner diameter of the extension rod groove (8). The extension rod groove (8) is provided with a groove conical bottom (15) near the bottom of the core (5). The inner diameter of the extension rod groove (8) below the groove conical bottom (15) is close to that of the sleeve (7).

9. A sleeve extension rod mechanism according to claim 1, 2, 3, 4, 5, or 7, characterized in that, The core (5) is provided with several extension rod grooves (8). The inner diameter of each extension rod groove (8) is not necessarily the same. Each extension rod groove (8) is matched with the needle (2).

10. The sleeve extension rod mechanism according to claim 9, characterized in that, The end of the core (5) is the product (17), which covers the opening of the extension rod groove (8).

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