Telescopic mechanism containing inner diameter of hardware cylinder and die

Abstract

The utility model discloses a telescopic mechanism and a mould for containing the inner diameter of a hardware cylinder, which comprise an insert rod, a lower rod section and an elastic petal section, and the elastic petal section can be in contact with the inner wall of the hardware cylinder; the elastic petal section comprises a plurality of elastic petals arranged in a circle in the circumferential direction, a hollow channel is defined by all the elastic petals, linear grooves are formed in the faces, facing the hollow channel, of the elastic petals, and bosses are arranged on the faces, facing the hollow channel, of the elastic petals; the length direction of the linear groove is parallel to the axis of the insert rod, a through hole is formed between the inner wall and the outer wall of the hardware cylinder, and the boss and the through hole can be positioned; one end of the insert rod is the tail end of the elastic petal, a center rod movably assembled with the linear groove is arranged in the hollow channel, the cross section of the outer wall of the center rod is not uniform, and the outer wall of the center rod can extrude the elastic petal. The requirement for uniformity of the shape of the hardware cylinder is not high, and the hardware cylinder can be conveniently positioned and can be conveniently used in the field of injection molding.

Description

Technical Field

[0001] The utility model relates to the field of composite injection molds, in particular to a telescopic mechanism and a mold for containing the inner diameter of a hardware cylinder. Background Art

[0002] There is a composite injection molded part, that is, a composite injection molded body of a metal part and a plastic part. Figure 1 As shown, the shape of the metal part is a metal cylinder 2, and the metal cylinder 2 often has an axial cavity 21. It should be noted that the inner wall and outer wall of the metal cylinder 2 in the prior art are not provided with a Figure 1 , Figure 2 The through hole 22 shown. Figure 2 The figure shows the state after the metal cylinder 2 and the plastic part 1 are matched. The plastic part 1 is mainly fixed on the outer wall of the metal cylinder 2. They are formed in a composite injection mold.

[0003] like Figure 1 As shown, when the metal cylinder 2 is produced by stamping, the cross section of the inner wall is often not strictly speaking a true circle, but the cross section of the insert for positioning it on the mold is circular, so the shapes do not match each other, which will cause poor positioning.

[0004] The inner diameter of the stamping will have a tolerance value, and the size will change within the specification, but the positioning of the insert is a fixed value. When the outer diameter of the insert is larger than the inner diameter of the metal cylinder 2, it is difficult to implant the metal cylinder 2. When the outer diameter of the insert is smaller than the inner diameter of the metal cylinder 2, implantation is easy, but the positioning may be unstable, causing the finished product size to vary. Therefore, both the former and the latter situations are prone to defects, which is caused by the inherent instability of the shape of the metal cylinder 2. The shape of the metal cylinder 2 is within a range, and its shape is subject to the existing process capabilities and production costs, and it is impossible to make significant precision improvements in the short term. Utility Model Content

[0005] The problem to be solved by the utility model is to provide a telescopic mechanism and a mold for accommodating the inner diameter of a metal cylinder, which does not require high uniformity of the shape of the metal cylinder itself, is convenient for positioning the metal cylinder, and is convenient for use in the field of injection molding.

[0006] In order to solve the above problems, the utility model provides a telescopic mechanism and a mold for accommodating the inner diameter of a hardware cylinder. In order to achieve the above purpose, the technical solution adopted by the utility model to solve its technical problems is:

[0007] On the one hand, a telescopic mechanism for accommodating the inner diameter of a hardware cylinder includes: an insert rod, including a lower rod section and an elastic petal section, the elastic petal section can contact the inner wall of the hardware cylinder; the elastic petal section includes a plurality of elastic petals arranged in a circle along the circumferential direction, all the elastic petals surround a hollow channel, the elastic petals have a linear groove on one side facing the hollow channel, and the elastic petals have a boss on one side facing the hollow channel; the length direction of the linear groove is parallel to the axis of the insert rod, a through hole is provided between the inner wall and the outer wall of the hardware cylinder, and the boss can be positioned with the through hole; one end of the insert rod is the end of the elastic petal, a center rod movably assembled with the linear groove is provided in the hollow channel, the outer wall of the center rod has an uneven cross-section, and the outer wall of the center rod can squeeze the elastic petal.

[0008] The beneficial effect of adopting the above technical solution is: this technical solution is adapted to the existing hardware cylinder and its injection molding process through modification. First, the positioning form of the insert rod and the hardware cylinder is a boss and a through hole. This positioning and support is relatively convenient, and is not affected by the slight concave and convex deformation of different batches of hardware cylinders. Secondly, the elastic petal has the elastic freedom of swinging and fixing, so it gives the boss a radial freedom of movement within a certain range, which is convenient for the loosening and tightening of the insert rod and the hardware cylinder. Finally, the boss can also block the through hole to avoid glue overflow during injection molding. When the hardware cylinder is embedded for injection molding, it can well accommodate the inner diameter of the hardware, which is convenient for the hardware to be placed in the mold and the product to be ejected. It has strong tolerance for hardware, reduces the cost of stamping improvement, and can effectively prevent scratches when the hardware is placed and ejected.

[0009] As a further improvement of the utility model, the outer wall of the center rod has a tapered surface; according to the different cross-sectional profiles of the elastic petals, the elastic petals are divided into a plurality of first elastic petals and a plurality of second elastic petals, and the first elastic petals and the second elastic petals are arranged alternately.

[0010] The beneficial effect of adopting the above technical solution is: the elastic petals are squeezed by the conical surface, so that the elastic petals spread radially outward, and then the boss and the through hole are positioned. As long as there is relative axial movement between the center rod and the insert rod.

[0011] As a further improvement of the present invention, the number of the first elastic petals and the number of the second elastic petals are both three, and the first elastic petals and the second elastic petals each have a straight groove.

[0012] The beneficial effect of adopting the above technical solution is that the straight line groove plays a role of straight line guidance.

[0013] As a further improvement of the utility model, the cross-sectional area of ​​the first elastic flap is smaller than the cross-sectional area of ​​the second elastic flap; the contact point between the first elastic flap and the second elastic flap is a contact surface, and the contact surface of the second elastic flap and the two adjacent first elastic flaps coincide on the same spatial plane; the contact surfaces of the first elastic flap and the two adjacent second elastic flaps form an angle with each other, and the distance between the two contact surfaces on both sides of the first elastic flap itself gradually decreases as they go radially outward.

[0014] The beneficial effect of adopting the above technical solution is that the second elastic petal can be squeezed by squeezing the first elastic petal.

[0015] As a further improvement of the utility model, the cross-sectional profile of the boss is in the shape of a waist-shaped hole, the through hole is a waist-shaped hole, and the length direction of the waist-shaped hole itself is perpendicular to the axis of the hardware cylinder.

[0016] The beneficial effect of adopting the above technical solution is that the waist-shaped hole can be thicker than the round hole and can also have the limiting ability to prevent rotation.

[0017] As a further improvement of the utility model, the boss is located on the surface of the second elastic flap; the root of the boss itself transitions to the surface of the second elastic flap through an outer round corner, and the edge of the top surface of the boss itself has an outer round corner.

[0018] The beneficial effects of adopting the above technical solution are: the outer wall of the boss is smoother as a whole, which facilitates the positioning of the boss and the through hole and reduces the accuracy required for positioning; secondly, it prevents the boss from scratching the hardware cylinder.

[0019] As a further improvement of the utility model, the linear groove is a dovetail groove.

[0020] The beneficial effects of adopting the above technical solution are: the dovetail groove is not easy to loosen and the linear guiding effect is good.

[0021] As a further improvement of the utility model, a flange section of the insert rod is located between the lower rod section and the elastic petal section, the thickness of the flange section is greater than that of the lower rod section and the elastic petal section, and the roots of all elastic petals are located at the junction of the elastic petal section and the flange section.

[0022] The beneficial effect of adopting the above technical solution is that the flange section can play a stopping role at the extreme position.

[0023] On the other hand, the mold includes the telescopic mechanism mentioned above that accommodates the inner diameter of the hardware cylinder.

[0024] As a further improvement of the utility model, the mold includes a male mold plate, a supporting plate, an ejector plate, an ejector pad, and a bottom plate in sequence along a single direction; the male mold plate is half-wrapped with a male mold core, and the elastic petal section is located in the male mold core; the insert rod passes through the male mold plate and the male mold core; one end of the lower rod section of the insert rod is fixed to the supporting plate by a screw; the supporting plate and the ejector plate are connected by a number of springs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a three-dimensional diagram of a hardware cylinder in one embodiment of the telescopic mechanism for accommodating the inner diameter of the hardware cylinder of the utility model;

[0027] Figure 2 It is an assembly diagram of a plastic part and a hardware cylinder in one embodiment of a telescopic mechanism for accommodating the inner diameter of a hardware cylinder of the utility model;

[0028] Figure 3 It is an axial view of an implementation of the telescopic mechanism for accommodating the inner diameter of a hardware cylinder of the utility model;

[0029] Figure 4 It is a front view of an implementation method of the telescopic mechanism for accommodating the inner diameter of a hardware cylinder of the utility model;

[0030] Figure 5 It is a side view of an implementation of the telescopic mechanism for accommodating the inner diameter of a hardware cylinder of the utility model;

[0031] Figure 6 It is a structural schematic diagram of an implementation method of the mold of the utility model;

[0032] Figure 7 It is a structural schematic diagram of an implementation method of the mold of the utility model.

[0033] 1-Plastic part; 2-Hardware cylinder; 21-Axial cavity; 22-Through hole; 3-Insert rod; 31-Lower rod section; 32-Flange section; 33-First elastic flap; 34-Second elastic flap; 35-Boss; 36-Hollow channel; 37-Dovetail groove; 38-Contact surface; 4-Male mold plate; 5-Male mold core; 6-Carrying plate; 7-Foot pad; 8-Ejector plate; 9-Ejector pad; 10-Bottom plate; 11-Screw; 12-Spring; X-Stroke. DETAILED DESCRIPTION

[0034] The following is a further detailed description of the present invention in conjunction with specific embodiments:

[0035] In order to achieve the purpose of the utility model, a telescopic mechanism for containing the inner diameter of a hardware cylinder includes: an insert rod 3, including a lower rod section 31 and an elastic petal section, the elastic petal section can contact the inner wall of the hardware cylinder 2; the elastic petal section includes a plurality of elastic petals arranged along a circumferential circle, all of which surround a hollow channel 36, and the elastic petal has a linear groove on one side facing the hollow channel. Figure 4 As shown, the elastic flap has a boss 35 on one side facing the hollow channel 36; the length direction of the linear groove is parallel to the axis of the insert rod 3, a through hole 22 is provided between the inner wall and the outer wall of the hardware cylinder 2, and the boss 35 can be positioned with the through hole 22; one end of the insert rod 3 is the end of the elastic flap, and a center rod movably assembled with the linear groove is provided in the hollow channel 36, the outer wall cross-section of the center rod is uneven, and the outer wall of the center rod can squeeze the elastic flap.

[0036] Since the central rod has a simple shape and in order to facilitate the illustration of the hollow channel 36 , the central rod is not shown.

[0037] In addition, if Figure 1 As shown, the metal cylinder 2 itself has an axial cavity 21 for the insert rod 3 to pass through. Figure 2 As shown, the finished product of the metal cylinder 2 has a circle of plastic parts 1 fixed on the outer wall of the metal cylinder 2 .

[0038] The beneficial effect of adopting the above technical solution is: this technical solution is adapted to the existing hardware cylinder and its injection molding process through modification. First, the positioning form of the insert rod and the hardware cylinder is a boss and a through hole. This positioning and support is relatively convenient, and is not affected by the slight concave and convex deformation of different batches of hardware cylinders. Secondly, the elastic petal has the elastic freedom of swinging and fixing, so it gives the boss a radial freedom of movement within a certain range, which is convenient for the loosening and tightening of the insert rod and the hardware cylinder. Finally, the boss can also block the through hole to avoid glue overflow during injection molding. When the hardware cylinder is embedded for injection molding, it can well accommodate the inner diameter of the hardware, which is convenient for the hardware to be placed in the mold and the product to be ejected. It has strong tolerance for hardware, reduces the cost of stamping improvement, and can effectively prevent scratches when the hardware is placed and ejected.

[0039] In some other embodiments of the present invention, the outer wall of the center rod has a tapered surface; according to the different cross-sectional profiles of the elastic petals, the elastic petals are divided into a plurality of first elastic petals 33 and a plurality of second elastic petals 34, and the first elastic petals 33 and the second elastic petals 34 are arranged alternately.

[0040] The beneficial effect of adopting the above technical solution is: the elastic petals are squeezed by the conical surface, so that the elastic petals spread radially outward, and then the boss and the through hole are positioned. As long as there is relative axial movement between the center rod and the insert rod.

[0041] In some other embodiments of the present invention, the number of the first elastic petals 33 and the number of the second elastic petals 34 are both three, and the first elastic petals 33 and the second elastic petals 34 each have a straight groove.

[0042] The beneficial effect of adopting the above technical solution is that the straight line groove plays a role of straight line guidance.

[0043] like Figure 3 As shown, in some other embodiments of the utility model, the cross-sectional area of ​​the first elastic flap 33 is smaller than the cross-sectional area of ​​the second elastic flap 34; the contact point between the first elastic flap 33 and the second elastic flap 34 is a contact surface 38, and the second elastic flap 34 and the contact surface 38 of the two adjacent first elastic flaps 33 coincide with each other in the same spatial plane; the contact surfaces 38 of the first elastic flap 33 and the two adjacent second elastic flaps 34 form an angle with each other, and the distance between the two contact surfaces 38 on both sides of the first elastic flap 33 itself gradually decreases as they go radially outward.

[0044] The beneficial effect of adopting the above technical solution is that the second elastic petal can be squeezed by squeezing the first elastic petal.

[0045] In some other embodiments of the present invention, the cross-sectional profile of the boss 35 is in the shape of a waist-shaped hole, and the through hole 22 is a waist-shaped hole, and the length direction of the waist-shaped hole itself is perpendicular to the axis of the hardware cylinder 2.

[0046] The beneficial effect of adopting the above technical solution is that the waist-shaped hole can be thicker than the round hole and can also have the limiting ability to prevent rotation.

[0047] In other embodiments of the present invention, the boss 35 is located on the surface of the second elastic flap 34; the root of the boss 35 itself transitions to the surface of the second elastic flap 34 through an outer fillet, and the edge of the top surface of the boss 35 itself has an outer fillet.

[0048] The beneficial effects of adopting the above technical solution are: the outer wall of the boss is smoother as a whole, which facilitates the positioning of the boss and the through hole and reduces the accuracy required for positioning; secondly, it prevents the boss from scratching the hardware cylinder.

[0049] like Figure 3 As shown, in some other embodiments of the present invention, the linear groove is a dovetail groove 37 .

[0050] The conical surface of the center rod is also provided with dovetail joints, and the extension directions of the dovetail joints are also divergent on the center rod.

[0051] The beneficial effects of adopting the above technical solution are: the dovetail groove is not easy to loosen and the linear guiding effect is good.

[0052] like Figure 4As shown, in other embodiments of the utility model, the flange section 32 of the insert rod 3 is located between the lower rod section 31 and the elastic petal section, the thickness of the flange section 32 is greater than the thickness of the lower rod section 31 and the elastic petal section, and the roots of all elastic petals are located at the junction of the elastic petal section and the flange section 32.

[0053] Figure 5 compared to Figure 4 , Figure 5 The dashed line in FIG. 3 expresses the visually blocked outline of the insert rod 3. A linear power member is fixed to the lower rod section 31 of the insert rod 3, and the linear power member drives the insert rod 3 to move linearly. Figure 5 The stroke X of the linear motion of the insert rod 3 is shown in FIG.

[0054] The beneficial effect of adopting the above technical solution is that the flange section can play a stopping role at the extreme position.

[0055] The mold includes the telescopic mechanism mentioned above that accommodates the inner diameter of the hardware cylinder.

[0056] like Figure 6 As shown, in other embodiments of the utility model, the mold includes a male mold plate 4, a support plate 6, an ejector plate 8, an ejector pad 9, and a bottom plate 10 in sequence along a single direction; the male mold plate 4 is half-wrapped with a male mold core 5, and the elastic petal section is located in the male mold core 5; the insert rod 3 passes through the male mold plate 4 and the male mold core 5; one end of the lower rod section 31 of the insert rod 3 is fixed to the support plate 6 by a screw 11; the support plate 6 and the ejector plate 8 are connected by a plurality of springs 12.

[0057] Figure 6 and Figure 7 It is also a cross-sectional view. Figure 6 It is in the mold opening state. Figure 7 It is the closed mold state. At the same time, Figure 6 The travel X is also shown.

[0058] like Figure 6 As shown, when the mold is in the open state, the spring 12 will prop up the male mold plate 4 (or B plate), and the six telescopic petals will move upward with the male mold plate 4 until the mold core surface fits the telescopic hanging platform. At this time, the outer diameter of the six telescopic petals is in a retracted state, which is much smaller than the minimum tolerance inner diameter of the stamping part (i.e., the hardware cylinder 2), ensuring that the hardware cylinder 2 can be easily placed in the mold.

[0059] like Figure 7 As shown, when the mold is closed from top to bottom, the male mold plate 4 is forced to compress the spring 12 downward until it fits with the carrier plate 6. At this time, the six telescopic petals are in an outward state, which is exactly the minimum inner diameter of the hardware cylinder 2, but the four waist-shaped holes on the telescopic petals can support the hardware cylinder 2 to meet the positioning requirements.

[0060] When the injection molding is completed, the mold opens, the telescopic flaps retract, and then the hardware is loosened to facilitate the final ejection of the product.

[0061] In the specific structure of the mold, when the mold is in the open state, the spring 12 lifts the male mold plate 4 together with the male mold core 5 and the insert rod 3 by a stroke X. There are four springs 12 in total, and they are arranged around. The two ends of the spring 12 support the ejector plate 8 and the male mold plate 4 respectively. The male mold core 5 is installed in the male mold plate 4. The insert rod 3, which serves as the telescopic body, passes through the male mold core 5 and the male mold plate 4. At the same time, one end of the insert rod 3 is locked on the support plate 6, and together with the pad 7 (or C plate) and the bottom plate 10, it is fixed on the machine table. Various elastic petals are located in the male mold core 5. The support plate 6 and the pad 7 are locked together.

[0062] In order to cope with the different shapes of the metal cylinder 2 from a microscopic perspective, the through hole 22 is used as a positioning support, and at the same time, it is necessary to ensure that no glue overflow occurs. Each metal cylinder 2 has four through holes 22 in total. The final product of the metal cylinder 2 is to embed the plastic part 1, which is also an injection molded part. The area of ​​the through hole 22 is also a local glue filling area, and the elastic flap enters it for sealing.

[0063] When the mold is closed, the six elastic petals are in an outwardly expanded state, which just corresponds to the minimum inner diameter of the metal cylinder 2. At the same time, the four bosses 35 on the elastic petals can support the metal cylinder 2 to meet the positioning requirements and prevent the molten plastic from overflowing.

[0064] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A telescopic mechanism for containing the inner diameter of a hardware cylinder, characterized in that: include: The insert rod comprises a lower rod section and an elastic petal section, wherein the elastic petal section can contact the inner wall of the hardware cylinder; the elastic petal section comprises a plurality of elastic petals arranged in a circle along the circumference, all of the elastic petals surround a hollow channel, and the elastic petals have a linear groove on one side facing the hollow channel, and a boss on one side facing the hollow channel; The length direction of the linear groove is parallel to the axis of the insert rod, a through hole is provided between the inner wall and the outer wall of the hardware cylinder, and the boss can be positioned with the through hole; One end of the insert rod is the end of the elastic flap, and a center rod movably assembled with the linear groove is arranged in the hollow channel. The cross section of the outer wall of the center rod is uneven, and the outer wall of the center rod can squeeze the elastic flap.

2. The telescopic mechanism for containing the inner diameter of a hardware cylinder according to claim 1, characterized in that: The outer wall of the central rod is provided with a tapered surface; According to different cross-sectional profiles of the elastic flaps, the elastic flaps are divided into a plurality of first elastic flaps and a plurality of second elastic flaps, and the first elastic flaps and the second elastic flaps are arranged alternately.

3. The telescopic mechanism for containing the inner diameter of a hardware cylinder according to claim 2, characterized in that: The number of the first elastic petals and the number of the second elastic petals are both three, and the first elastic petals and the second elastic petals are each provided with a straight groove.

4. The telescopic mechanism for containing the inner diameter of a hardware cylinder according to claim 2, characterized in that: The cross-sectional area of ​​the first elastic flap is smaller than the cross-sectional area of ​​the second elastic flap; The contact point between the first elastic flap and the second elastic flap is a contact surface, and the contact surface of the second elastic flap and the two adjacent first elastic flaps coincides with the same spatial plane; the contact surfaces of the first elastic flap and the two adjacent second elastic flaps form an angle with each other, and the distance between the two contact surfaces on both sides of the first elastic flap itself gradually decreases as it moves radially outward.

5. The telescopic mechanism for containing the inner diameter of a hardware cylinder according to claim 2, characterized in that: The cross-sectional profile of the boss is in the shape of a waist-shaped hole, the through hole is a waist-shaped hole, and the length direction of the waist-shaped hole itself is perpendicular to the axis of the hardware cylinder.

6. The telescopic mechanism for containing the inner diameter of a hardware cylinder according to claim 5, characterized in that: The boss is located on the surface of the second elastic flap; The root of the boss itself transitions to the surface of the second elastic flap through an outer round corner, and the edge of the top surface of the boss itself has an outer round corner.

7. The telescopic mechanism for containing the inner diameter of a hardware cylinder according to claim 1, characterized in that: The linear groove is a dovetail groove.

8. The telescopic mechanism for containing the inner diameter of a hardware cylinder according to claim 1, characterized in that: The flange section of the insert rod is located between the lower rod section and the elastic petal section. The thickness of the flange section is greater than that of the lower rod section and the elastic petal section. The roots of all elastic petals are located at the junction of the elastic petal section and the flange section.

9. The mold is characterized by: It comprises a telescopic mechanism for accommodating the inner diameter of a hardware cylinder as described in any one of claims 1 to 8.

10. The mold according to claim 9, characterized in that: The mold includes a male mold plate, a support plate, an ejector plate, an ejector pad, and a bottom plate in sequence along a single direction; The male mold plate is half-wrapped with a male mold core, and the elastic petal segment is located in the male mold core; The insert rod passes through the male mold plate and the male mold core; One end of the lower rod section of the insert rod is fixed to the support plate by screws; The support plate and the ejector plate are connected via a plurality of springs.

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