Threaded core-pulling mechanism

Abstract

The utility model discloses a kind of thread core-pulling mechanisms, comprising: mounting seat, rotationally arranged on the mounting seat screw core, rack is driven screw core rotation and is passed in the mounting seat top plate;The rack is equipped with installation positioning hole, and when installation positioning hole and mounting seat top plate are in close contact, rack drives screw core rotation to the position corresponding with the angle of the thread starting point in injection molded part. Thread core-pulling mechanism of the utility model, installation positioning hole is equipped on the rack, when installing thread core-pulling mechanism on injection mold, whether rack is installed in place can be determined by installation positioning hole, as long as installation positioning hole and mounting seat top plate are in close contact, it can be ensured that rack has driven screw core rotation to the position corresponding with the angle of the thread starting point in injection molded part, the thread starting point angle of injection molded part can be avoided due to the large positioning variable when rack is installed to influence.

Description

Technical Field

[0001] This utility model relates to a threaded core-pulling mechanism. Background Technology

[0002] A threaded core-pulling mechanism is used in injection molds to pull the internal threads of injection molded parts. A typical threaded core-pulling mechanism includes a threaded core that mates with the internal threads of the injection molded part, and a rack that drives the threaded core to rotate during core pulling. However, existing threaded core-pulling mechanisms have large positioning variables during rack installation, affecting the thread starting angle of the injection molded part. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this utility model provides a threaded core-pulling mechanism, comprising: a mounting base, a threaded core rotatably mounted on the mounting base, and a rack passing through the top plate of the mounting base and driving the threaded core to rotate; the rack is provided with a mounting positioning hole, and when the mounting positioning hole is in contact with the top plate of the mounting base, the rack drives the threaded core to rotate to a position corresponding to the thread starting point angle of the internal thread of the injection molded part.

[0004] Preferably, it further includes: a driven gear located inside the threaded core and coaxial with the threaded core; a large transmission gear rotatably mounted on the mounting base and meshing with the driven gear; and a small transmission gear located inside the large transmission gear, coaxial with the large transmission gear, and meshing with a rack.

[0005] Preferably, it further includes: a drive plate fixed to the outer end of the rack, and a guide post fixed to the top plate of the mounting base and slidingly engaged with the drive plate.

[0006] Preferably, it also includes: a telescopic cylinder fixedly connected to the drive plate, and a fixing frame that fixes the telescopic cylinder to the top plate of the mounting base.

[0007] Preferably, the telescopic cylinder is a hydraulic cylinder.

[0008] Preferably, the mounting positioning hole is a through hole.

[0009] The advantages and beneficial effects of this utility model are as follows: It provides a threaded core pulling mechanism, in which a rack is provided with a mounting positioning hole. When installing the threaded core pulling mechanism on the injection mold, the mounting positioning hole can be used to determine whether the rack is installed in place. As long as the mounting positioning hole is in contact with the top plate of the mounting seat, it can be ensured that the rack has driven the threaded core to rotate to a position corresponding to the thread starting point angle of the internal thread of the injection molded part. This can avoid the large positioning variables during rack installation affecting the thread starting point angle of the injection molded part.

[0010] Specifically, before installing the threaded core-pulling mechanism on the injection mold, the rack drives the threaded core to rotate to a position corresponding to the thread start point angle of the internal thread of the injection molded part. Then, in this state, mark the drilling point at the position where the rack and the top plate of the mounting base are in contact, and then drill a through hole at that point as a mounting positioning hole.

[0011] When installing a threaded core-pulling mechanism on an injection mold, the installation positioning hole is used to determine whether the rack is installed in place. As long as the installation positioning hole is in contact with the top plate of the mounting seat, it can be ensured that the rack has driven the threaded core to rotate to the position corresponding to the thread starting point angle of the internal thread of the injection molded part. This can avoid the large positioning variables during rack installation affecting the thread starting point angle of the injection molded part.

[0012] When the threaded core-pulling mechanism is installed on the injection mold, the telescopic cylinder (hydraulic cylinder) drives the drive plate to move closer to or away from the top plate of the mounting seat. The drive plate drives the rack to move deeper into or out of the mounting seat. The rack drives the small transmission gear to rotate forward or backward. The small transmission gear drives the large transmission gear to rotate forward or backward synchronously. The large transmission gear drives the driven gear to rotate forward or backward synchronously. The driven gear drives the threaded core to rotate forward or backward synchronously, so that the threaded core can be pulled out or reset. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall threaded core-pulling mechanism; Figure 2 This is a schematic diagram of the inside of the mounting bracket. Detailed Implementation

[0014] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0015] The specific technical solution of this utility model is as follows: like Figure 1 and Figure 2 As shown, this utility model provides a threaded core-pulling mechanism, comprising: a mounting base 1; a threaded core 2 rotatably mounted on the mounting base 1; a rack 3 passing through the top plate of the mounting base 1 and driving the threaded core 2 to rotate; a driven gear 21 located inside the threaded core 2 and coaxial with the threaded core 2; a large transmission gear 41 rotatably mounted on the mounting base 1 and meshing with the driven gear 21; a small transmission gear 42 located inside the large transmission gear 41, coaxial with the large transmission gear 41, and meshing with the rack 3; a drive plate 5 fixed to the outer end of the rack 3; a guide post 6 fixed to the top plate of the mounting base 1 and slidingly engaged with the drive plate 5; a telescopic cylinder 7 fixedly connected to the drive plate 5; and a fixing frame 8 fixing the telescopic cylinder 7 to the top plate of the mounting base 1; wherein the telescopic cylinder 7 is a hydraulic cylinder. The rack 3 is provided with a mounting positioning hole 31. When the mounting positioning hole 31 is in contact with the top plate of the mounting base 1, the rack 3 drives the threaded core 2 to rotate to a position corresponding to the thread starting point angle of the internal thread of the injection molded part; the mounting positioning hole 31 is a through hole.

[0016] Specifically, before installing the threaded core pulling mechanism on the injection mold, the rack 3 drives the threaded core 2 to rotate to a position corresponding to the thread starting point angle of the internal thread of the injection molded part. Then, in this state, mark the drilling point at the position where the rack 3 and the top plate of the mounting seat 1 are in contact, and then drill a through hole at this point as the mounting positioning hole 31.

[0017] When installing the threaded core-pulling mechanism on the injection mold, the installation positioning hole 31 is used to determine whether the rack 3 is installed in place. As long as the installation positioning hole 31 is in contact with the top plate of the mounting base 1, it can be ensured that the rack 3 has driven the threaded core 2 to rotate to the position corresponding to the thread starting point angle of the internal thread of the injection molded part. This can avoid the large positioning variables during the installation of the rack 3 affecting the thread starting point angle of the injection molded part. More specifically, a rod that slides through the installation positioning hole 31 can be inserted, and then the rod is in contact with the top plate of the mounting base 1 to more easily determine that the installation positioning hole 31 is in contact with the top plate of the mounting base 1.

[0018] When the threaded core-pulling mechanism is installed on the injection mold, the telescopic cylinder 7 (hydraulic cylinder) drives the drive plate 5 to approach or move away from the top plate of the mounting seat 1. The drive plate 5 drives the rack 3 to enter or exit the mounting seat 1. The rack 3 drives the small transmission gear 42 to rotate forward or reverse. The small transmission gear 42 drives the large transmission gear 41 to rotate forward or reverse synchronously. The large transmission gear 41 drives the driven gear 21 to rotate forward or reverse synchronously. The driven gear 21 drives the threaded core 2 to rotate forward or reverse synchronously, so that the threaded core 2 can achieve threaded core-pulling or resetting.

[0019] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A threaded core-pulling mechanism, comprising: A mounting base, a threaded core rotatably mounted on the mounting base, and a rack passing through the top plate of the mounting base and driving the threaded core to rotate; characterized in that the rack is provided with a mounting positioning hole, and when the mounting positioning hole is in contact with the top plate of the mounting base, the rack drives the threaded core to rotate to a position corresponding to the angle of the starting point of the internal thread of the injection molded part.

2. The threaded core-pulling mechanism according to claim 1, characterized in that, Also includes: A driven gear located inside the threaded core and coaxial with the threaded core; a large transmission gear rotatably mounted on the mounting base and meshing with the driven gear; and a small transmission gear located inside the large transmission gear, coaxial with the large transmission gear, and meshing with the rack.

3. The threaded core-pulling mechanism according to claim 1, characterized in that, Also includes: A drive plate fixed to the outer end of the rack, and a guide post fixed to the top plate of the mounting base and slidingly engaged with the drive plate.

4. The threaded core-pulling mechanism according to claim 1, characterized in that, Also includes: A telescopic cylinder fixed to the drive plate, and a fixing frame that fixes the telescopic cylinder to the top plate of the mounting base.

5. The threaded core-pulling mechanism according to claim 4, characterized in that, The telescopic cylinder is a hydraulic cylinder.

6. The threaded core-pulling mechanism according to claim 1, characterized in that, The mounting and positioning hole is a through hole.

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