Injection molding mold of pre-embedded sleeve

Abstract

The utility model belongs to the technical field of track accessory production equipment, and relates to an injection molding mold of a pre-embedded sleeve, which comprises a left mold and a right mold, the left mold and the right mold are assembled to form a cavity for molding the pre-embedded sleeve, a rear mold is arranged on the rear side of the left mold, and the right mold is arranged on the rear side of the rear mold. The rear mold is driven by a power device to slide between an injection molding position on the front side and a demolding position on the rear side, a core rod is arranged on the front side of the rear mold, the core rod forms an internal thread of the pre-embedded sleeve at the injection molding position, and the core rod is driven by the power device to rotate and is gradually separated from the formed pre-embedded sleeve in the process of moving towards the demolding position; and the axial displacement generated by the rotation of the core rod is the same as the sliding speed of the rear mold. According to the injection molding mold for the pre-embedded sleeve, automatic demolding can be achieved after injection molding, and full automation of injection molding production of the pre-embedded sleeve is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of production equipment for track fittings, and relates to an injection molding die for embedded sleeves. Background Art

[0002] The embedded sleeve is an engineering plastic part with threads both inside and outside. For the plastic mold of the external thread, the parting surface can be set on the symmetric center plane, and demolding is convenient when the mold is separated. However, for the internal thread, it is necessary to manually screw out the threaded mandrel from the molded embedded sleeve after injection molding. This demolding method is slow and labor-intensive, so it urgently needs to be improved.

[0003] Chinese Utility Model Patent CN216001122U (Publication Date: March 11, 2022) discloses a rapid demolding tooling for the production of embedded sleeves, including a frame, a rotating assembly with a clamping hole arranged on the frame, and a clamping assembly slidably arranged on the frame. The clamping assembly is used to clamp the embedded sleeve with a support rod. The clamping hole is used to clamp one end of the support rod and drive the support rod to rotate relative to the embedded sleeve. It also includes a feeding assembly with a pushing member. The pushing member is slidably arranged on the frame. The clamping assembly includes two first telescopic members slidably arranged on the frame, and two clamping members oppositely arranged on the telescopic ends of the two first telescopic members. After the first telescopic machine extends and retracts, it drives the two clamping members to move. The two clamping members are used to clamp the embedded sleeve. After the pushing member slides, it abuts against the clamping member and drives the clamping member to move towards the clamping hole.

[0004] Although the above tooling realizes the automatic demolding of the embedded sleeve and the support rod, it is still necessary to first remove the embedded sleeve with the support rod from the injection molding machine and then feed it into the demolding tooling for demolding, and its automation degree is still not high. Summary of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the utility model provides an injection molding die for embedded sleeves, which can automatically demold after injection molding and realize the full automation of the injection production of embedded sleeves.

[0006] To solve the above technical problems, the purpose of the utility model is achieved through the following technical solutions:

[0007] An injection molding die for embedded sleeves includes a left mold and a right mold. After the left mold and the right mold are closed, a cavity for forming the embedded sleeve is formed. A rear mold is arranged at the rear side of the left mold. The rear mold is driven by a power device to slide between the front injection position and the rear demolding position. A mandrel is arranged at the front side of the rear mold. The mandrel forms the internal thread of the embedded sleeve at the injection position, and is driven by the power device to rotate and gradually separate from the formed embedded sleeve during the process of moving towards the demolding position. The axial displacement generated by the rotation of the mandrel is the same as the sliding speed of the rear mold.

[0008] In the above-mentioned injection molding mold for embedded sleeves, there are four cavities on the left mold and the right mold, and they are arranged in parallel from top to bottom; there are four core rods on the rear mold, and they are arranged in parallel from top to bottom; the core rods are arranged in one-to-one correspondence with the cavities.

[0009] In the above-mentioned injection molding mold for embedded sleeve, a first runner is arranged in the middle of the left mold, the rear end of the first runner is connected to the material injection port, and the front end is connected to the middle of the second runner, the upper end of the second runner is connected to the third runner, and the lower end is connected to the fourth runner, the upper and lower ends of the third runner are respectively connected to the front ends of the two upper cavities, and the upper and lower ends of the fourth runner are respectively connected to the front ends of the two lower cavities; preferably, the first runner is arranged in the horizontal direction, and the second runner, the third runner and the fourth runner are all arranged in the vertical direction; preferably, the radial dimension of the first runner is larger than that of the second runner, and the radial dimension of the second runner is larger than that of the third runner and the fourth runner.

[0010] In the above-mentioned injection molding mold for the embedded sleeve, the radial dimension of the third flow channel and the cavity connecting hole is smaller than the radial dimension of the third flow channel; the radial dimension of the fourth flow channel and the cavity connecting hole is smaller than the radial dimension of the fourth flow channel.

[0011] In the above-mentioned injection molding mold for embedded sleeve, a push hole is arranged in the left mold, and a push rod driven by a power device to be telescopic is arranged in the push hole. The push hole is arranged at the corresponding position of the left mold flow channel. When the push rod is retracted, its end face does not exceed the bottom of the flow channel. When the push rod is extended, its end face exceeds the right end face of the left mold; the push rod is driven by a conventional power device in this field, such as a cylinder or an electromagnet.

[0012] In the above-mentioned injection molding die for the embedded sleeve, the push holes are respectively arranged at the connecting parts of the second flow channel and the third flow channel and the fourth flow channel.

[0013] In the above-mentioned injection molding mold for the embedded sleeve, the core rods are driven to rotate by the same motor, and the motor and each core rod are connected to each other through a gear assembly; of course, the motor can also be driven by a synchronous belt or chain.

[0014] In the above-mentioned injection molding die for the embedded sleeve, the rear die is driven to slide by a motor, and the rear die is connected to the motor through a screw assembly.

[0015] In the above-mentioned injection molding die for embedded sleeve, preferably, the core rod and the rear mold are driven by the same motor, and a gear for driving the core rod to rotate is mounted on the motor shaft of the motor. At the same time, the end of the motor shaft is connected to the screw transmission.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The utility model provides an injection molding die for an embedded sleeve. The traditional mandrel is connected to a slidable rear mold, and then the mandrel is driven to rotate by a power device. After the injection molding is completed, the power device drives the rear mold to slide and the mandrel to rotate, so that the rear mold and the mandrel generate the same front-back displacement and the mandrel gradually disengages from the embedded sleeve, realizing demolding. The demolding of the mandrel of the utility model can be automatically completed in the injection molding machine, and the completely demolded finished product of the embedded sleeve can be produced by the injection molding machine. Therefore, the automation degree and production efficiency of the production of the embedded sleeve can be improved.

[0018] 2. The utility model further improves the demolding structure of the embedded sleeve and the left mold. By arranging a pushing rod acting on the remaining edge, the embedded sleeve can be quickly pushed out of the cavity of the left mold. At the same time, since the pushing rod impacts the remaining edge of the embedded sleeve, the connection between the remaining edge and the embedded sleeve can also be made more fragile, so that it disengages during the falling process, and there is no need to use a trimming device to cut the remaining edge. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural view of the rear mold of the utility model at the injection molding position;

[0020] Figure 2 is a schematic structural view of the rear mold of the utility model at the demolding position;

[0021] Reference numerals: 1, left mold; 2, right mold; 3, cavity; 4, rear mold; 5, mandrel; 6, first runner; 7, second runner; 8, third runner; 9, fourth runner; 10, pushing hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following further describes the utility model with specific embodiments in conjunction with the drawings, see Figure 1-2 :

[0023] An injection molding die for an embedded sleeve includes a left mold 1 and a right mold 2. After the left mold 1 and the right mold 2 are closed, a cavity 3 for forming the embedded sleeve is formed. A rear mold 4 is arranged at the rear side of the left mold 1. The rear mold 4 is driven by a power device to slide between the front injection molding position and the rear demolding position. A mandrel 5 is arranged at the front side of the rear mold 4. The mandrel 5 forms an internal thread of the embedded sleeve at the injection molding position, and is driven to rotate and gradually disengage from the formed embedded sleeve during the process of moving to the demolding position. The axial displacement generated by the rotation of the mandrel 5 is the same as the sliding speed of the rear mold 4.

[0024] The working process of this embodiment is as follows: Before injection molding, the left mold 1 and the right mold 2 are clamped, and the rear mold 4 is moved to the injection position. At this time, the cavities 3 of the left mold 1 and the right mold 2 and the mandrel 5 of the rear mold 4 together form the molding structure of the embedded sleeve; inject materials into the cavity 3 to complete the injection molding; after the injection molding is completed, the right mold 2 moves to the right and separates from the left mold 1 (as shown in the attachment Figure 1 ), start the rotation drive device of the mandrel 5 and the sliding drive device of the rear mold 4. The molded embedded sleeve is limited by the cavity 3 of the left mold 1 and is in a fixed state. When the mandrel 5 rotates relative to the embedded sleeve, the mandrel 5 generates an axial displacement and moves backward synchronously with the rear mold 4 until the mandrel 5 is completely separated from the embedded sleeve (as shown in the attachment Figure 2 ), and finally the molded embedded sleeve is taken out of the cavity 3 of the left mold 1 and falls into the material box at the bottom of the injection molding machine to complete the production.

[0025] In order to improve production efficiency, this embodiment can simultaneously mold multiple embedded sleeves: Four cavities 3 are provided on the left mold 1 and the right mold 2, and are arranged in parallel from top to bottom; Four mandrels 5 are provided on the rear mold 4, and are arranged in parallel from top to bottom; The mandrel 5 and the cavity 3 are arranged in one-to-one correspondence.

[0026] In this embodiment, the injection runner is arranged as follows: A first runner 6 is provided in the middle of the left mold 1. The rear end of the first runner 6 is communicated with the material injection port, and the front end is communicated with the middle of the second runner 7. The upper end of the second runner 7 is communicated with the third runner 8, and the lower end is communicated with the fourth runner 9. The upper and lower ends of the third runner 8 are respectively communicated with the front ends of the two upper cavities 3, and the upper and lower ends of the fourth runner 9 are respectively communicated with the front ends of the two lower cavities 3. The materials injected from the material injection port enter each cavity 3 in sequence through the first runner 6, the second runner 7, the third runner 8 and the fourth runner 9; Preferably, the first runner 6 is arranged horizontally, and the second runner 7, the third runner 8 and the fourth runner 9 are all arranged vertically; Preferably, in order to make the flow smoother, the radial dimension of the first runner 6 is larger than that of the second runner 7, and the radial dimension of the second runner 7 is larger than that of the third runner 8 and the fourth runner 9.

[0027] The radial dimension of the communication hole between the above-mentioned third runner 8 and the cavity 3 is smaller than the radial dimension of the third runner 8; The radial dimension of the communication hole between the fourth runner 9 and the cavity 3 is smaller than the radial dimension of the fourth runner 9. After the injection molding is completed, corresponding flash will be generated in each runner. By setting smaller communication holes, the connection between the flash and the embedded sleeve can be more easily broken without affecting the material flow.

[0028] In order to make the embedded sleeve escape from the cavity 3 of the left mold 1, the present embodiment further provides a push demoulding structure: a push hole 10 is provided in the left mold 1, and a push rod driven by a power device to extend and retract is provided in the push hole 10. The push hole 10 is provided at the corresponding position of the flow channel of the left mold 1. When the push rod is retracted, its end face does not exceed the bottom of the flow channel, so that the push rod does not affect the flow of materials. When the push rod is extended, its end face exceeds the right end face of the left mold 1, and the push rod pushes out the remaining edge, thereby removing the embedded sleeve. The tube is pushed out from the cavity 3 of the left mold 1. During the push, the push rod hits the residual edge of the embedded sleeve, which can also make the connection between the residual edge and the embedded sleeve more fragile. After the embedded sleeve is pushed out of the cavity 3, it falls to the material frame at the bottom under the action of gravity. During or after the falling process, the residual edge and the embedded sleeve can be automatically separated. Of course, for those that are not separated, the residual edge can be easily broken off manually without the need for a trimming mechanism. The push rod is driven by a conventional power device in the field, such as a cylinder or an electromagnet.

[0029] In this embodiment, in order to push the residual edge more easily, the pushing holes 10 are respectively arranged at the connection points between the second flow channel 7 and the third flow channel 8 and the fourth flow channel 9, and the pushing rod acts on the vertical intersection of the residual edge.

[0030] The core rods 5 are driven to rotate by the same motor, and the motor is connected to each core rod 5 via a gear assembly; of course, the motor can also be driven by a synchronous belt or chain.

[0031] The rear mold 4 is driven to slide by a motor, and the rear mold 4 is connected to the motor through a screw assembly.

[0032] Preferably, the core rod 5 and the rear mold 4 are driven by the same motor, and a gear for driving the core rod 5 to rotate is mounted on the motor shaft of the motor. At the same time, the end of the motor shaft is transmission-connected to the screw rod.

[0033] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An injection molding mold for an embedded sleeve, comprising a left mold (1) and a right mold (2), wherein the left mold (1) and the right mold (2) are combined to form a mold cavity (3) for molding the embedded sleeve, characterized in that: A rear mold (4) is arranged on the rear side of the left mold (1), and the rear mold (4) is driven by a power device to slide between an injection molding position on the front side and a demolding position on the rear side. A core rod (5) is arranged on the front side of the rear mold (4), and the core rod (5) molds the internal thread of the embedded sleeve at the injection molding position. During the movement of the core rod (5) to the demolding position, the core rod is driven by the power device to rotate and gradually separate from the molded embedded sleeve. The axial displacement generated by the rotation of the core rod (5) is consistent with the sliding speed of the rear mold (4).

2. The injection molding die for the embedded sleeve according to claim 1, characterized in that: There are four cavities (3) on the left mold (1) and the right mold (2), which are arranged in parallel from top to bottom; there are four core rods (5) on the rear mold (4), which are arranged in parallel from top to bottom; the core rods (5) are arranged in one-to-one correspondence with the cavities (3).

3. The injection molding die for the embedded sleeve according to claim 2, characterized in that: A first flow channel (6) is provided in the middle of the left mold (1); the rear end of the first flow channel (6) is connected to the material injection port, and the front end is connected to the middle of the second flow channel (7); the upper end of the second flow channel (7) is connected to the third flow channel (8), and the lower end is connected to the fourth flow channel (9); the upper and lower ends of the third flow channel (8) are respectively connected to the front ends of the two upper cavities (3); and the upper and lower ends of the fourth flow channel (9) are respectively connected to the front ends of the two lower cavities (3).

4. The injection molding die for the embedded sleeve according to claim 3, characterized in that: The radial dimension of the connecting hole between the third flow channel (8) and the mold cavity (3) is smaller than the radial dimension of the third flow channel (8); the radial dimension of the connecting hole between the fourth flow channel (9) and the mold cavity (3) is smaller than the radial dimension of the fourth flow channel (9).

5. The injection molding die for the embedded sleeve according to claim 3, characterized in that: A push hole (10) is provided in the left mold (1), and a push rod that is retractable and driven by a power device is provided in the push hole (10). The push hole (10) is provided at a corresponding position of the flow channel of the left mold (1). When the push rod is retracted, its end face does not exceed the bottom of the flow channel. When the push rod is extended, its end face exceeds the right end face of the left mold (1).

6. The injection molding die for the embedded sleeve according to claim 5, characterized in that: The pushing holes (10) are respectively arranged at the connecting points between the second flow channel (7) and the third flow channel (8) and the fourth flow channel (9).

7. The injection molding die for the embedded sleeve according to claim 2, characterized in that: The core rods (5) are driven to rotate by the same motor, and the motor and each core rod (5) are connected in transmission via a gear assembly.

8. The injection molding die for the embedded sleeve according to claim 1, characterized in that: The rear mold (4) is driven to slide by a motor, and the rear mold (4) is connected to the motor through a screw assembly.

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