Whole-circle inner tooth core-pulling demolding mechanism

Abstract

The utility model discloses a whole circle inner tooth core-pulling demoulding mechanism which comprises a support, a mandrel, three first half moulds and three second half moulds, the support is provided with a side hole, the three second half moulds are distributed around the mandrel at equal intervals, the mandrel is provided with three first sliding grooves distributed at equal intervals in the circumferential direction, and the first sliding grooves are communicated with the side hole. A first sliding rail is formed on the inner side face of each second half die, each second half die comprises two symmetrically-arranged first planes, a second plane is formed on the portion, between every two adjacent second half dies, of the core shaft, the second plane parts and the first plane parts are attached to each other and are in sliding fit, and second sliding grooves extending transversely are formed in the second plane parts. Second sliding rails are formed on the first planes in a protruding mode, the second sliding rails are clamped in the second sliding grooves and are in sliding fit with the second sliding grooves, and the front ends of the three first half dies and the front ends of the three second half dies are spliced to form a whole-circle inner tooth forming part. The demoulding mechanism has the characteristics of better linkage performance, stronger driving capability, higher demoulding accuracy and the like.

Description

Technical Field

[0001] The utility model relates to a core-pulling mechanism after injection molding of the inner teeth of a workpiece, in particular to a core-pulling and demoulding mechanism for the inner teeth of a whole circle. Background Art

[0002] Some inner holes of injection molded workpieces are generally equipped with a full circle of internal teeth. The processing technology is to divide the mold that can form the cavity into several units, and use the core shaft to synchronously drive the several units to separate from the internal teeth. This driving method requires the core shaft and each unit mold to transmit transmission to each other. However, in the narrow space inside the hole, it is difficult to ensure that the core shaft can reliably drive each mold. As a result, the driving effect is poor and the demolding failure rate is high. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a full-circle inner thread core-pulling demoulding mechanism with better linkage performance, stronger driving ability and higher demoulding accuracy in response to the deficiencies of the existing technology.

[0004] In order to solve the above technical problems, the present utility model adopts the following technical solutions.

[0005] A full-circle inner tooth core-pulling demolding mechanism comprises a support, a core shaft, three first half molds with outer arc surfaces and three second half molds with outer arc surfaces, the support is provided with a side hole, the diameter of the core shaft gradually decreases from front to back, the core shaft passes through the side hole, the three second half molds are evenly distributed around the core shaft, the core shaft is provided with three first slide grooves evenly distributed along the circumferential direction, the inner side surface of the second half mold is formed with a first slide rail, the first slide rail is clamped in the first slide groove and the two are slidably matched, the second half mold includes two symmetrically arranged first planes, a second plane is formed on the core shaft between two adjacent second half molds, the first planes of the two second half molds and the second plane between the two second half molds are flush The first and second half molds are arranged to form a first plane portion, the first half mold corresponds to the first plane portion one by one, a second plane portion is formed on the inner side of the first half mold, the second plane portion and the first plane portion fit together and the two slide together, a second sliding groove extending laterally is opened on the second plane portion, a second sliding rail is protruded on the first plane, the second sliding rail is clamped in the second sliding groove and the two slide together, the front ends of the three first half molds and the front ends of the three second half molds are assembled to form a full circle of inner tooth forming portion, when external force drives the core shaft to slide outward relative to the three second half molds, the core shaft drives the three second half molds to move toward the axial center direction of the core shaft, and the two adjacent second half molds drive the corresponding first half molds to move toward the axial center direction of the core shaft.

[0006] Preferably, the first sliding groove and the second sliding groove are both dovetail grooves, and the first sliding rail and the second sliding rail are both dovetail sliding rails.

[0007] Preferably, two front and rear second sliding grooves are formed on the second plane portion, and two front and rear second sliding rails are protruded from the first plane.

[0008] Preferably, the rear end of the first half mold is formed with a first limiting protrusion protruding outward, and the rear end edge of the side hole is formed with three first step grooves, the first limiting protrusions correspond to the first step grooves one by one, and the first limiting protrusions are clamped in the first step grooves.

[0009] Preferably, the rear end of the second half mold is formed with a second limiting protrusion protruding outward, and the rear end edge of the side hole is formed with three second step grooves, the second limiting protrusions correspond to the second step grooves one by one, and the second limiting protrusions are clamped in the second step grooves.

[0010] Preferably, a first base is included, the support is fixed to the front end of the first base, a transmission slider that can slide back and forth is provided on the first base, and the transmission slider is fixedly connected to the rear end of the core shaft.

[0011] Preferably, a second base is included, a cylinder is provided on the second base, and a telescopic shaft of the cylinder is transmission-connected to the first base.

[0012] In the full circle inner tooth core-pulling demoulding mechanism disclosed by the present invention, the core shaft, the three first half molds and the three second half molds are assembled and then pass through the side holes on the support. The full circle inner tooth forming part formed by the three first half molds and the three second half molds is used to process and shape the full circle inner teeth on the injection molded workpiece. During the demoulding process, the core shaft is driven by a preset driving mechanism to slide backward. Since the diameter of the core shaft gradually decreases from front to back, and the relationship between the first slide rail and the first slide groove is that they can only slide forward and backward, the core shaft will drive the three second half molds to move toward the axial center direction of the core shaft, and At the same time, based on the lateral sliding cooperation relationship between the second slide rail and the second slide groove, the three second half molds are driven to move synchronously toward the axial direction of the core shaft, thereby separating the entire circle of inner teeth forming part from the entire circle of inner teeth. In the above structure, the core shaft only needs to drive the three second half molds to retract synchronously, and the second half mold can be used to drive the three first half molds to retract synchronously. The core shaft does not need to be directly matched with the three first half molds, which can not only ensure that the core shaft can be reliably driven, but also achieve good linkage cooperation, thereby achieving technical effects such as better linkage performance, stronger driving ability, and higher demolding accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a three-dimensional diagram of the utility model's full-circle inner thread core-pulling and demoulding mechanism;

[0014] Figure 2 This is a structural diagram of the entire inner thread core-pulling demoulding mechanism and the injection molded workpiece of the utility model;

[0015] Figure 3 A structural diagram of the assembled mandrel, three first mold halves, and three second mold halves;

[0016] Figure 4 An exploded view of a mandrel, three first mold halves, and three second mold halves;

[0017] Figure 5 An exploded view of the mandrel and the three first mold halves;

[0018] Figure 6 is a structural diagram of the second plane portion and the first plane portion;

[0019] Figure 7 This is a comparison view of the state changes before and after core pulling of the utility model. DETAILED DESCRIPTION

[0020] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments.

[0021] The utility model discloses a whole circle inner thread core pulling and demoulding mechanism, combined with Figures 1 to 6As shown, it includes a support 1, a core shaft 2, three first half molds 3 with outer arc surfaces and three second half molds 4 with outer arc surfaces, the support 1 is provided with a side hole 10, the diameter of the core shaft 2 gradually decreases from front to back, the core shaft 2 passes through the side hole 10, the three second half molds 4 are evenly distributed around the core shaft 2, the core shaft 2 is provided with three first slide grooves 20 evenly distributed along the circumferential direction, and the first slide grooves 20 extend along the length direction of the core shaft 2, the inner side surface of the second half mold 4 is formed with a first slide rail 40, the first slide rail 40 is clamped in the first slide groove 20 and the two are slidably matched, the second half mold 4 includes two symmetrically arranged first planes 41, a second plane 21 is formed on the core shaft 2 between two adjacent second half molds 4, the first plane 41 of the two second half molds 4 and the second plane 21 between the two second half molds 4 It is arranged flush and forms a first plane portion 400, the first half mold 3 corresponds to the first plane portion 400 one by one, and a second plane portion 300 is formed on the inner side of the first half mold 3, the second plane portion 300 and the first plane portion 400 fit together and slide together, a second sliding groove 31 extending laterally is opened on the second plane portion 300, and a second sliding rail 42 is protrudingly formed on the first plane 41, the second sliding rail 42 is clamped in the second sliding groove 31 and the two slide together, the front ends of the three first half molds 3 and the front ends of the three second half molds 4 are spliced ​​together to form a full circle of inner tooth forming portion 200, when external force drives the core shaft 2 to slide outward relative to the three second half molds 4, the core shaft 2 drives the three second half molds 4 to move toward the axial direction of the core shaft 2, and the adjacent two second half molds 4 drive the corresponding first half molds 3 to move toward the axial direction of the core shaft 2.

[0022] In the above structure, the core shaft 2, the three first half molds 3 and the three second half molds 4 are assembled and pass through the side hole 10 on the support 1. The full circle inner tooth forming part 200 formed by the three first half molds 3 and the three second half molds 4 is used to process and shape the full circle inner teeth 101 on the injection molded workpiece 100. During the demolding process, the preset driving mechanism is used to drive the core shaft 2 to slide backward. Because the diameter of the core shaft 2 gradually decreases from front to back, and the first slide rail 40 and the first slide groove 20 are in a relationship that can only slide back and forth, the core shaft 2 will drive the three second half molds 4 to move toward the axial direction of the core shaft 2. At the same time, based on the lateral sliding cooperation relationship between the second slide rail 42 and the second slide groove 31, the three second half molds 4 are driven to move synchronously toward the axial direction of the core shaft 2, thereby separating the full circle inner tooth forming part 200 from the full circle inner teeth 101. The action process is as follows Figure 7As shown, in the above structure, the core shaft 2 only needs to drive the three second half molds 4 to retract synchronously, and the second half mold 4 can be used to drive the three first half molds 3 to retract synchronously. The core shaft 2 does not need to be directly matched with the three first half molds 3, which can not only ensure that the core shaft 2 is reliably driven, but also achieve good linkage cooperation, thereby achieving technical effects such as better linkage performance, stronger driving ability, and higher demolding accuracy.

[0023] In order to realize the relationship between the clamping limit and the sliding fit, in this embodiment, the Figures 4 to 6 As shown, the first sliding groove 20 and the second sliding groove 31 are both dovetail grooves, and the first sliding rail 40 and the second sliding rail 42 are both dovetail sliding rails.

[0024] The second chute 31 in this embodiment is a chute extending in the transverse direction (or tangential direction), see Figure 6 The second plane portion 300 is provided with two front and rear second sliding grooves 31 , and the first plane 41 is provided with two front and rear second sliding rails 42 protruding therefrom.

[0025] In this embodiment, the support 1 has the function of clamping and limiting the three first half molds 3 and the three second half molds 4. Figure 3 The rear end of the first half mold 3 is formed with a first limiting protrusion 34 protruding outward, and the rear end edge of the side hole 10 is formed with three first step grooves 12. The first limiting protrusion 34 corresponds to the first step groove 12 one by one, and the first limiting protrusion 34 is clamped in the first step groove 12.

[0026] Similarly, see Figure 3 and Figure 6 In this embodiment, a second limiting protrusion 43 protruding outward is formed at the rear end of the second half mold 4, and three second step grooves 11 are formed at the rear end edge of the side hole 10. The second limiting protrusion 43 corresponds to the second step groove 11 one by one, and the second limiting protrusion 43 is clamped in the second step groove 11.

[0027] As a preferred method, see Figure 1 and Figure 2 This embodiment includes a first base 13, the support 1 being fixed to the front end of the first base 13. A transmission slider 14 capable of sliding back and forth is provided on the first base 13. The transmission slider 14 is fixedly connected to the rear end of the core shaft 2. Regarding the specific transmission relationship, in this embodiment, an inclined hole 140 may be formed on the transmission slider 14. A lifting and tilting rod 141 above the transmission slider 14, which can be inserted into the inclined hole 140, drives the transmission slider 14 to slide back and forth.

[0028] In order to realize the demoulding action after core pulling, combined with Figure 1 and Figure 2 As shown, this embodiment includes a second base 15 , on which a cylinder 16 is provided. The telescopic shaft of the cylinder 16 is in transmission connection with the first base 13 .

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements or improvements made within the technical scope of the present invention should be included in the scope of protection of the present invention.

Claims

1. A full circle inner thread core pulling and demoulding mechanism, characterized in that: The invention comprises a support (1), a core shaft (2), three first half molds (3) with outer arc surfaces and three second half molds (4) with outer arc surfaces, wherein the support (1) is provided with a side hole (10), the diameter of the core shaft (2) gradually decreases from front to back, the core shaft (2) passes through the side hole (10), the three second half molds (4) are evenly spaced around the core shaft (2), the core shaft (2) is provided with three first slide grooves (20) evenly spaced along the circumference, and the first slide grooves (20) are provided with a plurality of first slide grooves (20) arranged on the core shaft (2). The second half mold (4) extends along the length direction of the core shaft (2), and the inner side surface of the second half mold (4) is formed with a first slide rail (40), the first slide rail (40) is clamped in the first slide groove (20) and the two slide together, the second half mold (4) includes two symmetrically arranged first planes (41), a second plane (21) is formed on the core shaft (2) between the two adjacent second half molds (4), the first planes (41) of the two second half molds (4) and the second plane (21) between the two second half molds (4) are arranged flush and form a first plane portion (400), the first half mold (3) corresponds to the first plane portion (400) one by one, a second plane portion (300) is formed on the inner side of the first half mold (3), the second plane portion (300) and the first plane portion (400) are fitted with each other and slide together, a second slide groove (31) extending laterally is opened on the second plane portion (300), a second slide rail (42) is protruded on the first plane (41), and the second slide rail (42) is clamped in the second slide groove (31) and the two are slidably matched. The front ends of the three first half molds (3) and the front ends of the three second half molds (4) are assembled to form a full circle of inner tooth forming part (200). When an external force drives the core shaft (2) to slide outward relative to the three second half molds (4), the core shaft (2) drives the three second half molds (4) to move toward the axial center direction of the core shaft (2), and the adjacent two second half molds (4) drive the corresponding first half molds (3) to move toward the axial center direction of the core shaft (2).

2. The full-circle inner thread core-pulling demoulding mechanism according to claim 1, characterized in that: The first slide groove (20) and the second slide groove (31) are both dovetail grooves, and the first slide rail (40) and the second slide rail (42) are both dovetail slide rails.

3. The full-circle inner thread core-pulling demoulding mechanism according to claim 1, characterized in that: Two front and rear second slide grooves (31) are formed on the second plane portion (300), and two front and rear second slide rails (42) are protruded from the first plane (41).

4. The full-circle inner thread core-pulling demoulding mechanism according to claim 1, characterized in that: A first limiting convex buckle (34) protruding outward is formed at the rear end of the first half mold (3), and three first step grooves (12) are formed at the rear end edge of the side hole (10). The first limiting convex buckle (34) corresponds to the first step groove (12) one by one, and the first limiting convex buckle (34) is clamped in the first step groove (12).

5. The full-circle inner thread core-pulling demoulding mechanism according to claim 1, characterized in that: A second limiting convex buckle (43) protruding outward is formed at the rear end of the second half mold (4), and three second step grooves (11) are formed at the rear end edge of the side hole (10). The second limiting convex buckle (43) corresponds to the second step grooves (11) one by one, and the second limiting convex buckle (43) is clamped in the second step groove (11).

6. The full-circle inner thread core-pulling demoulding mechanism according to claim 1, characterized in that: The invention comprises a first base (13), the support (1) is fixed to the front end of the first base (13), a transmission slider (14) which can slide forward and backward is provided on the first base (13), and the transmission slider (14) is fixedly connected to the rear end of the core shaft (2).

7. The full-circle inner thread core-pulling demoulding mechanism according to claim 6, characterized in that: The utility model comprises a second base (15), wherein an oil cylinder (16) is provided on the second base (15), and a telescopic shaft of the oil cylinder (16) is transmission-connected to the first base (13).

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