Ejector pin counterbore rotation stop mold base

Abstract

This invention relates to a mold frame for anti-rotation of ejector pins with countersunk heads, applicable to the field of mold ejector pin technology. It includes a lower mold, an ejector sleeve, an ejector pin, an anti-rotation groove, a countersunk head, a lifting bolt, an ejector plate, an assembly hook, and a spring ring. The spring ring is sleeved with the countersunk head. This structure allows for the extension and retraction adjustment of the ejector sleeve, facilitating the installation of ejector pins in different molds. When the ejector pin retracts back into the ejector sleeve, the ejector plate is pulled downwards by a power device, causing the spring ring on the assembly hook to apply a downward pulling force to the countersunk head. The elastic deformation of the spring ring counteracts the difference in extension and retraction height between different ejector pins, enabling the ejector plate to synchronously drive the extension and retraction of multiple sets of ejector pins, effectively improving the mold demolding efficiency.

Description

Technical Field

[0001] This invention relates to an ejector pin mold base, and more particularly to an ejector pin countersunk head anti-rotation mold base applied in the field of mold ejector pin technology. Background Technology

[0002] Ejector pins are installed in plastic molds. Ejector pins are tools used to eject products from the mold and are usually installed in the lower mold. At the same time, ejector pins in plastic molds can also be used inside the mold to play a stabilizing role. They are also called insert pins. When ejector pins are used in conjunction with ejector sleeves, they are called ejector pin and ejector sleeve assemblies, which are a type of plastic mold accessories. Ejector pin and ejector sleeve are the ejector pins in the ejector pin assembly.

[0003] Chinese invention patent CN202121396542.7 discloses a molding die ejector assembly. This patent, through the arrangement of a screw part, piston part, connecting plate and other structures, adds an adjustable part at the bottom of the ejector pin, which can adjust the overall length of the ejector pin. It can be used for molds of different specifications and can be installed in a targeted manner, without requiring high machining accuracy of the ejector pin.

[0004] Because the inside of the mold is not flat, the ejector sleeve of the ejector pin also needs to be adjusted accordingly to make the ejector sleeve flush with the inside of the mold. The existing ejector sleeve lacks the function of length adjustment. At the same time, multiple sets of ejector pin structures need to be installed inside the mold. Each set of ejector pin mechanisms has its own specified contraction and extension states, which is not conducive to the synchronous extension and retraction of multiple sets of ejector pins, thus affecting the demolding efficiency of the mold. Summary of the Invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the sleeve cannot be adjusted for extension length and multiple sets of ejector pins cannot maintain synchronous extension and retraction movement in their own specific extension and retraction states.

[0006] To solve the above problems, the present invention provides a mold frame with a countersunk ejector head for preventing rotation, including a lower mold, a mold frame fixedly connected to the bottom of the lower mold, an upper mold plate and a lower mold plate fixedly connected to the top and bottom of the mold frame respectively, a sleeve movably connected between the upper mold plate and the lower mold plate, and the top end of the sleeve being flush with the inner surface of the lower mold, an ejector pin sleeved inside the sleeve, and the top end of the ejector pin being flush with the top end of the sleeve, an anti-rotation groove formed on the outer wall of the sleeve, a countersunk head fixedly connected to the bottom end of the ejector pin, and the countersunk head slidingly connected to the anti-rotation groove; a lifting bolt movably connected to the bottom end of the sleeve, the lifting bolt being threadedly connected to the lower mold plate, an ejector plate movably connected between the upper mold plate and the lower mold plate, a sleeve hole formed on the surface of the ejector plate corresponding to the sleeve, an assembly hook fixedly connected to both ends of the upper opening of the sleeve hole, an elastic ring fixedly connected to the outside of the assembly hook, and the elastic ring sleeved with the countersunk head.

[0007] In the aforementioned mold frame with countersunk ejector pins, the extension and retraction of the sleeve is adjusted by rotating the lifting bolts, which facilitates the installation of ejector pins in different molds. Then, the countersunk head is fitted with an elastic ring, and the elastic deformation of the elastic ring is used to offset the difference in extension and retraction height of different ejector pins, so that the ejector plate can synchronously drive the extension and retraction of multiple sets of ejector pins, effectively improving the demolding efficiency of the mold.

[0008] As a further improvement of this application, fixing nails are fixedly connected to both the left and right ends of the assembly hook, and the inner ring ends of the elastic ring are fixedly connected to two fixing nails respectively. The fixing nails divide the elastic ring into upper and lower parts, which facilitates the installation, fixing and stretching deformation of the elastic ring.

[0009] As a further improvement of this application, the elastic ring is hollow inside, and a limiting wire ring is sleeved inside the elastic ring. Both ends of the middle part of the limiting wire ring are fixedly connected to the fixing pins. The limiting wire ring limits the maximum tension of the elastic ring, and the fixing pins improve the stability of the limiting wire ring.

[0010] As a further improvement of this application, the circumference of the limiting coil is greater than that of the elastic ring, and the limiting coil is folded in a wave shape, which facilitates the folding and expansion of the limiting coil inside the elastic ring, effectively preventing the limiting coil from being exposed and achieving a smooth surface of the elastic ring.

[0011] As a further improvement to this application, the elastic ring is made of elastic rubber material and the limiting thread is made of tensile fiber material. The elastic ring made of elastic rubber material has a good elastic deformation effect, thereby using the deformation of the elastic ring to offset the difference in extension and retraction height of different ejector pins. The limiting thread made of tensile fiber material effectively improves the tensile effect of the elastic ring and effectively avoids the elastic ring from excessive deformation and breakage.

[0012] As another improvement of this application, side grooves are provided at both ends of the sleeve hole, and guide strips are inserted inside the side grooves. The assembly hook is slidably connected to the guide strip. By sliding the assembly hook on the guide strip, the rotation of the sleeve and the ejector pin is effectively prevented.

[0013] As a further improvement to this application, the top and bottom ends of the guide strip are fitted with abutment plates, which correspond to the top and bottom ends of the countersunk head, respectively. The abutment plates are used to hold the countersunk head in place, thereby limiting the extension and retraction of the ejector pin.

[0014] As a further improvement to this application, the bottom end face of the upper template and the top end face of the lower template are both fixedly connected with inner lining rings, and the outer side of the inner lining rings is fitted with abutting rings. The opposite side of the two abutting rings is fixedly connected with an abutting ramp, and the slope of the abutting ramp contacts the bottom end of the abutting plate. By rotating the abutting rings, the abutting ramp is driven to rotate at the bottom of the abutting plate, thereby realizing the change of the height of the abutting plate.

[0015] As another improvement of this application, the external thread of the contact ring is connected with a clamping screw, the inner end of which is clamped to the inner liner ring. The contact ring and the inner liner ring are fixed by tightening the clamping screw.

[0016] As a further improvement to this application, the outer ring of the contact ring is provided with a mating groove, which is parallel to and corresponds to the slope of the contact ramp. The bottom end of the contact plate is fixedly connected to a mating end, which is movably connected to the mating groove. The mating end moves within the mating groove to facilitate the movable connection between the contact ring and the contact plate.

[0017] In summary, this solution achieves the telescopic adjustment of the ejector sleeve by rotating the lifting bolt, facilitating the installation of ejector pins in different molds. When the ejector pin retracts back into the ejector sleeve, the ejector plate is pulled down by the power equipment, causing the elastic ring on the assembly hook to apply a downward pulling force to the countersunk end. The elastic deformation of the elastic ring offsets the difference in telescopic height between different ejector pins, enabling the ejector plate to synchronously drive the telescopic movement of multiple sets of ejector pins, effectively improving the demolding efficiency of the mold. Attached Figure Description

[0018] Figure 1 This is a perspective structural diagram of the first embodiment of this application;

[0019] Figure 2 This is a perspective structural diagram of the sleeve according to the first embodiment of this application;

[0020] Figure 3 This is a cross-sectional view of the sleeve according to the first embodiment of this application;

[0021] Figure 4 This is a demonstration diagram showing how the rotation of the lifting bolt drives the sleeve to rise in the first embodiment of this application.

[0022] Figure 5 This is a demonstration diagram of the elastic ring deformation according to the first embodiment of this application;

[0023] Figure 6 This is a cross-sectional view of the coil limiting the first embodiment of this application;

[0024] Figure 7 This is a three-dimensional structural diagram of the inner liner and the abutment ring according to the second embodiment of this application;

[0025] Figure 8 This is a three-dimensional structural diagram of the contact ring according to the second embodiment of this application;

[0026] Figure 9 This is a perspective view of the guide bar and the contact plate according to the second embodiment of this application;

[0027] Figure 10 This is a top view of the sleeve hole according to the second embodiment of this application;

[0028] Figure 11 This is a demonstration diagram illustrating how the contact plate resists the rising and falling of the sinker end in the second embodiment of this application.

[0029] Explanation of the labels in the diagram:

[0030] 1. Lower mold; 2. Mold frame; 201. Upper template; 202. Lower template; 3. Sleeve; 301. Ejector pin; 302. Anti-rotation groove; 303. Countersunk end; 304. Lifting bolt; 4. Ejector plate; 401. Sleeve hole; 402. Assembly hook; 403. Elastic ring; 404. Fixing pin; 405. Restricting thread ring; 5. Side groove; 501. Guide strip; 502. Abutment plate; 6. Inner liner ring; 601. Abutment ring; 602. Abutment ramp; 603. Clamping screw; 604. Butt groove; 605. Butt end. Detailed Implementation

[0031] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0032] First implementation method:

[0033] Figure 1-3 The diagram shows a mold frame with a countersunk ejector pin for preventing rotation, comprising a lower mold 1, a mold frame 2 fixedly connected to the bottom of the lower mold 1, an upper template 201 and a lower template 202 fixedly connected to the top and bottom of the mold frame 2 respectively, a sleeve 3 movably connected between the upper template 201 and the lower template 202, the top end of the sleeve 3 being flush with the inner surface of the lower mold 1, an ejector pin 301 sleeved inside the sleeve 3, the top end of the ejector pin 301 being flush with the top end of the sleeve 3, an anti-rotation groove 302 formed on the outer wall of the sleeve 3, and a countersunk end 303 fixedly connected to the bottom end of the ejector pin 301, the countersunk end 303 being slidably connected to the anti-rotation groove 302;

[0034] When using the ejector pin, the ejector pin 301 moves in and out of the sleeve 3 and slides in the anti-rotation groove 302 through the countersunk end 303, preventing the ejector pin 301 from rotating during the ejection process, effectively avoiding product skewing when ejected, and thus effectively improving the product qualification rate.

[0035] Figure 2-4 As shown, a lifting bolt 304 is movably connected to the bottom end of the sleeve 3. The lifting bolt 304 is threadedly connected to the lower template 202. An ejector plate 4 is movably connected between the upper template 201 and the lower template 202. The ejector plate 4 is connected to a power device. The power device pushes the ejector plate 4 to realize the ejection movement of the ejector pin. A sleeve hole 401 is opened on the surface of the ejector plate 4 corresponding to the sleeve 3. An assembly hook 402 is fixedly connected to both ends of the upper opening of the sleeve hole 401. An elastic ring 403 is fixedly connected to the outside of the assembly hook 402. The elastic ring 403 is sleeved with the countersunk end 303.

[0036] The extension and retraction of the sleeve 3 is achieved by rotating the lifting bolt 304. The top of the sleeve 3 is adjusted to be flush with the inner surface of the lower mold 1, so that the ejector pin can be adapted to the installation of different molds. When the power equipment drives the ejector plate 4 to descend, the assembly hooks 402 at both ends of the upper opening of the sleeve hole 401 pull the countersunk head 303 down through the elastic ring 403, thereby realizing the descent and retraction of the ejector pin 301. When the retracted position of the ejector pin 301 is relatively high, the elastic ring 403 is stretched upward by the countersunk head 303 because the countersunk head 303 is in a higher position. The elastic deformation of the elastic ring 403 is used to offset the difference in extension and retraction height of different ejector pins 301.

[0037] Figure 5-6 As shown, both ends of the assembly hook 402 are fixedly connected to fixing pins 404. The inner ends of the elastic ring 403 are respectively fixedly connected to two fixing pins 404, dividing the elastic ring 403 into upper and lower parts using the fixing pins 404. The interior of the elastic ring 403 is hollow, and a limiting thread ring 405 is sleeved inside the elastic ring 403. Both ends of the middle part of the limiting thread ring 405 are fixedly connected to fixing pins 404. The circumference of the limiting thread ring 405 is greater than the circumference of the elastic ring 403. 05 is folded in a wave shape, which makes it easy to restrict the folding and stretching of the coil 405 inside the elastic ring 403, effectively preventing the coil 405 from being exposed, achieving a smooth surface of the elastic ring 403. The coil 405 restricts the maximum stretch of the elastic ring 403. The elastic ring 403 is made of elastic rubber material, and the coil 405 is made of tensile fiber material. The elastic ring 403 made of elastic rubber material has a good elastic deformation effect, thereby using the deformation of the elastic ring 403 to offset the difference in the stretching height of different ejector pins.

[0038] When the elastic ring 403 is fully stretched, the originally wavy and folded restrictive wire loop 405 inside the elastic ring 403 is straightened. The restrictive wire loop 405, made of tensile fiber material, bears the tension of the elastic ring 403, effectively preventing the elastic ring 403 from breaking due to excessive deformation.

[0039] Second implementation method:

[0040] Compared to the first embodiment, this embodiment mainly adds a guide bar 501. The specific added structure is as follows, while the rest of the structure is the same as the first embodiment.

[0041] Figure 7-11As shown, both ends of the sleeve hole 401 are provided with side grooves 5, and guide strips 501 are inserted into the side grooves 5. The assembly hook 402 is slidably connected to the guide strip 501. By sliding the assembly hook 402 on the guide strip 501, rotation of the sleeve 3 and the ejector pin 301 is effectively prevented. The top and bottom ends of the guide strip 501 are fitted with abutment plates 502, which correspond to the top and bottom ends of the countersunk head 303, respectively. The abutment plates 502 are used to hold the countersunk head 303 in place. This restricts the extension and retraction of the top cylinder pin 301. The bottom end face of the upper template 201 and the top end face of the lower template 202 are both fixedly connected with inner liner rings 6, and the outer side of the inner liner ring 6 is fitted with abutment rings 601. The opposite side of the two abutment rings 601 is fixedly connected with abutment ramps 602, and the slope of the abutment ramps 602 contacts the bottom end of the abutment plate 502. By rotating the abutment rings 601, the abutment ramps 602 are driven to rotate at the bottom of the abutment plate 502, thereby realizing the height change of the abutment plate 502.

[0042] When adjusting the extended and retracted states of the ejector pin 301, the operating contact ring 601 is rotated to adjust the contact ramp 602 to a specified ramp height to contact the contact plate 502, thereby adjusting the height of the contact plate 502. The contact plate 502 is then used to limit the minimum and maximum height of the countersunk end 303, thereby adjusting the extension and retraction range of the ejector pin 301, which facilitates the installation and use of ejector pins 301 of different lengths.

[0043] Figure 7-9 As shown, the outer thread of the contact ring 601 is connected to a clamping screw 603. The inner end of the clamping screw 603 is clamped and corresponds to the inner liner ring 6. The contact ring 601 and the inner liner ring 6 are fixed by tightening the clamping screw 603. The outer ring of the contact ring 601 is provided with a mating groove 604. The mating groove 604 is parallel to the slope surface of the contact ramp 602. The bottom end of the contact plate 502 is fixedly connected to a mating end head 605. The mating end head 605 is movably connected to the mating groove 604. The mating end head 605 moves in the mating groove 604 to facilitate the movable connection between the contact ring 601 and the contact plate 502.

[0044] During the rotation of the contact ring 601, the mating end 605 moves within the mating groove 604, ensuring that the contact plate 502 does not detach from the contact ring 601. This facilitates close contact between the contact plate 502 and the slope of the contact ramp 602. Subsequently, the clamping screw 603 is tightened, and the inner end of the clamping screw 603 presses tightly against the inner liner ring 6, thereby fixing the state of the contact ring 601.

[0045] Compared to the first embodiment, this embodiment adjusts the height of the contact plate 502 on the slope of the contact ramp 602 by rotating the contact ring 601. The contact plate 502 limits the minimum and maximum height of the countersunk head 303, thereby adjusting the extension range of the top cylinder pin 301, which facilitates the installation and use of top cylinder pins 301 of different lengths.

[0046] In light of current practical needs, the above-described embodiments adopted in this application are not limited to this scope of protection. Various changes made within the knowledge of those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. A mold base with a countersunk ejector pin for preventing rotation, characterized in that: The mold includes a lower mold (1), a mold frame (2) is fixedly connected to the bottom of the lower mold (1), an upper template (201) and a lower template (202) are fixedly connected to the top and bottom of the mold frame (2) respectively, a sleeve (3) is movably connected between the upper template (201) and the lower template (202), and the top of the sleeve (3) is flush with the inner surface of the lower mold (1). A top pin (301) is sleeved inside the sleeve (3), and the top of the top pin (301) is flush with the top of the sleeve (3). An anti-rotation groove (302) is opened on the outer wall of the sleeve (3), and a countersunk end (303) is fixedly connected to the bottom of the top pin (301). The countersunk end (303) is slidably connected to the anti-rotation groove (302). The bottom end of the sleeve (3) is movably connected to a lifting bolt (304), the lifting bolt (304) is threadedly connected to the lower template (202), and the upper template (201) and the lower template (202) are movably connected to a ejector plate (4). The surface of the ejector plate (4) is provided with a sleeve hole (401) corresponding to the sleeve (3). Both ends of the upper opening of the sleeve hole (401) are fixedly connected to an assembly hook (402). An elastic ring (403) is fixedly connected to the outside of the assembly hook (402), and the elastic ring (403) is sleeved with the countersunk end (303).

2. The mold frame with countersunk ejector pins for preventing rotation according to claim 1, characterized in that: The left and right ends of the assembly hook (402) are fixedly connected with fixing nails (404), and the two ends of the inner ring of the elastic ring (403) are fixedly connected with the two fixing nails (404) respectively.

3. A mold frame with a countersunk ejector pin for preventing rotation according to claim 2, characterized in that: The elastic ring (403) is hollow inside, and a limiting wire ring (405) is sleeved inside the elastic ring (403). Both ends of the middle part of the limiting wire ring (405) are fixedly connected to the fixing nail (404).

4. A mold frame with a countersunk ejector pin for preventing rotation according to claim 3, characterized in that: The circumference of the limiting coil (405) is greater than that of the elastic ring (403), and the limiting coil (405) is folded in a wave shape.

5. A mold frame with a countersunk ejector pin for preventing rotation according to claim 3, characterized in that: The elastic ring (403) is made of elastic rubber material, and the limiting wire ring (405) is made of tensile fiber material.

6. A mold frame with a countersunk ejector pin for preventing rotation according to claim 1, characterized in that: Both ends of the sleeve hole (401) are provided with side grooves (5), and a guide strip (501) is inserted inside the side groove (5). The assembly hook (402) is slidably connected to the guide strip (501).

7. A mold frame with a countersunk ejector pin for preventing rotation according to claim 6, characterized in that: The top and bottom ends of the guide strip (501) are fitted with abutment plates (502), and the two abutment plates (502) correspond to the top and bottom ends of the countersunk head (303), respectively.

8. A mold frame with a countersunk ejector pin for preventing rotation according to claim 7, characterized in that: The bottom end face of the upper template (201) and the top end face of the lower template (202) are both fixedly connected with inner lining rings (6), and the outer side of the inner lining rings (6) is fitted with abutting rings (601). The opposite side of the two abutting rings (601) is fixedly connected with abutting ramps (602), and the slope of the abutting ramps (602) contacts the bottom end of the abutting plate (502).

9. A mold frame with a countersunk ejector pin for preventing rotation according to claim 8, characterized in that: The outer thread of the contact ring (601) is connected to a clamping screw (603), and the inner end of the clamping screw (603) is clamped to the inner liner ring (6).

10. A mold frame with a countersunk ejector pin for preventing rotation according to claim 8, characterized in that: The outer ring of the contact ring (601) is provided with a mating groove (604), which is parallel to the slope of the contact ramp (602). The bottom end of the contact plate (502) is fixedly connected with a mating end (605), which is movably connected to the mating groove (604).

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