High-precision injection mold capable of automatically demolding threads

Abstract

The utility model discloses an automatic thread demoulding high-precision injection mold which comprises an upper mold base and a lower mold base, a mold cavity is formed in the top end of the lower mold base, an adjusting through hole is formed in the inner bottom surface of the mold cavity in a penetrating manner, and a thread base is movably inserted into the adjusting through hole. The upper die base and the lower die base are separated to drive the pull rod to move together, so that the rack and the driven gear are staggered and drive the driven gear to rotate, the driven gear drives the first transmission gear to rotate through the transmission mechanism, and the threaded base is driven to rotate in the rotating process of the first transmission gear; under the action of the threaded sleeve, the bottom end of the threaded seat gradually moves towards the interior of the threaded sleeve and retreats from the injection molding part to enter the adjusting through hole to be stored, the automatic thread demolding effect in the demolding process is achieved, the threaded seat can be stably driven to stably retreat and reset without additionally arranging a motor or an oil cylinder or other driving parts, the structure is simple, and the practicability is high. The space is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection mold technical field, concretely is a kind of automatic thread-removing high-precision injection mold. BACKGROUND

[0002] Injection mold is heated and injected into mold cavity with plastic material, then cools and solidifies to form product, with the advantages of high precision, high efficiency and low cost, in injection molding, some injection molding has thread groove or threaded hole inside, which usually needs to be equipped with thread-removing device to facilitate subsequent discharging.

[0003] In the prior art, Chinese patent CN205871086U discloses "a high-precision injection mold for threaded product", which comprises a lower die holder, an upper die holder and a driving mechanism; the upper end surface of the lower die holder is concave, a rotating shaft is arranged in the lower die holder, the upper end of the rotating shaft is a threaded part, the upper die holder is detachably mounted on the lower die holder, the bottom surface of the upper die holder and the concave cavity form a mold cavity, the transverse section of the mold cavity is a non-circular structure, an injection flow channel is arranged in the upper die holder, and the injection flow channel is communicated with the mold cavity; the driving mechanism is arranged on the lower die holder and drives the rotating shaft to rotate in the horizontal position.

[0004] Most of the current injection molds with thread-removing structure usually need to install additional oil cylinder, air cylinder or motor to drive the normal operation of thread-removing mechanism, which makes the floor area of injection mold larger and the structure more complicated, and the operation of oil cylinder, air cylinder or motor usually needs to be controlled by program, if there is program error, there will be more defective products, which affects the production efficiency of products. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing an automatic thread-removing high-precision injection mold to solve the problems in the above background.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: an automatic thread-removing high-precision injection mold, comprising an upper die holder and a lower die holder, the lower die holder is provided with a mold cavity at the top end, the inside bottom surface of the mold cavity is provided with an adjusting through hole, a threaded seat is movably inserted in the adjusting through hole, a No. 1 transmission gear is fixedly connected to the outer surface of the threaded seat, a threaded sleeve is threadedly connected to the bottom end of the threaded seat, a transmission mechanism is arranged in the lower die holder, and the transmission mechanism is drivingly connected to the threaded seat, a pull rod is fixedly connected to the two sides of the upper die holder, a gear rack is fixedly connected to one side of one of the pull rods, and the gear rack is drivingly connected to the transmission mechanism.

[0007] As a further preferred of the technical solution, the lower die seat is provided with a mounting through hole on one side, a driven plate is slidably arranged in the mounting through hole, and connecting blocks are fixedly connected to the two sides of the driven plate.

[0008] As a further preferred of the technical solution, four positioning rods are fixedly connected to the inner top surface of the mounting through hole, and the outer surfaces of the four positioning rods are slidably connected to the inner surface of the driven plate.

[0009] As a further preferred of the technical solution, the outer surfaces of the four positioning rods are sleeved with return springs, and the two ends of the return springs are in abutment with the top end of the driven plate and the inner top surface of the mounting through hole, respectively.

[0010] As a further preferred of the technical solution, the outer surface of the top rod is fixedly connected with a limiting ring, the outer surface of the limiting ring is slidably connected to the inner surface of the lower die seat, the outer surface of the top rod is sleeved with a pressing spring, and the two ends of the pressing spring are in abutment with the top end of the limiting ring and the inner surface of the lower die seat, respectively.

[0011] As a further preferred of the technical solution, the transmission mechanism comprises a second transmission gear, the outer surface of the second transmission gear is engaged with the outer surface of the first transmission gear, the top end of the second transmission gear is fixedly connected with a third transmission gear, the outer surface of the third transmission gear is engaged with a fourth transmission gear, the top end of the fourth transmission gear is fixedly connected with a first bevel gear, the outer surface of the first bevel gear is engaged with a second bevel gear, one end of the second bevel gear is drivingly connected with a transmission shaft, the one end of the transmission shaft is fixedly connected with a driven gear penetrating through the inner surface of the lower die seat, the outer surface of the driven gear is engaged with one side of the rack, and the two ends of the second transmission gear, the third transmission gear and the fourth transmission gear are rotatably connected to the inner surface of the lower die seat.

[0012] As a further preferred of the technical solution, the bottom end of the upper die seat is provided with a positioning groove near the four corners, the top end of the lower die seat is fixedly connected with positioning columns near the four corners, and the top ends of the four positioning columns are respectively inserted into the inner part of the four positioning grooves.

[0013] The automatic thread-removing high-precision injection mold has the following beneficial effects:

[0014] (1)The utility model discloses a upper die seat and lower die seat separation drive pull rod together with the movement, make the rack and driven gear between the dislocation and drive driven gear to rotate, let driven gear drive primary transmission gear to rotate through transmission mechanism, drive threaded seat to rotate in the process of primary transmission gear rotation, under the action of threaded bush, threaded seat bottom gradually moves to threaded bush inside and exits from injection molding part inside and is received in adjusting through -hole, realizes the automatic thread -removing effect in demolding process, and need not to add the motor or oil cylinder etc. Drive piece can stable drive threaded seat and exit and reset stably, simple structure, save space.

[0015] (2)The utility model discloses a upper die seat drive pull rod moves, under the action of delay through -hole, pull rod moves a distance and drive driven plate to move in installation through -hole and promote the top bar and move upwards, and the top bar pushes out the top plate from the storage groove, and the injection molding part after thread -removing is ejected from the mould cavity, realizes the effect of automatic demolding, simple structure, convenient operation and convenient material taking improve injection molding efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the schematic diagram of the whole structure of the utility model;

[0017] Figure 2 It is the schematic diagram of the structure when the upper die seat and lower die seat of the utility model separate;

[0018] Figure 3 It is the schematic diagram of the internal structure of the lower die seat of the utility model;

[0019] Figure 4 It is the sectional view schematic diagram of the internal structure of the lower die seat of the utility model;

[0020] Figure 5 It is the schematic diagram of the structure between transmission mechanism and threaded seat of the utility model.

[0021] In the drawing: 1, upper die seat;2, lower die seat;3, installation through -hole;4, mould cavity;5, adjusting through -hole;6, threaded seat;7, primary transmission gear;8, threaded bush;9, transmission mechanism;10, secondary transmission gear;11, third transmission gear;12, fourth transmission gear;13, primary bevel gear;14, secondary bevel gear;15, transmission shaft;16, driven gear;17, rack;18, pull rod;19, driven plate;20, connecting block;21, storage groove;22, top plate;23, top bar;24, limit ring;25, pressure spring;26, delay through -hole;27, positioning rod;28, reset spring;29, positioning column;30, positioning groove. DETAILED DESCRIPTION

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0023] This utility model provides a technical solution: such as Figures 1-4 As shown, in this embodiment, an automatic unscrewing high-precision injection mold includes an upper mold base 1 and a lower mold base 2. The lower mold base 2 has a mold cavity 4 at its top, and an adjustment through hole 5 is formed through the bottom surface of the mold cavity 4. A threaded seat 6 is movably inserted into the adjustment through hole 5. A first transmission gear 7 is fixedly connected to the outer surface of the threaded seat 6, and a threaded sleeve 8 is threadedly connected to the bottom end of the threaded seat 6. A transmission mechanism 9 is provided inside the lower mold base 2, and the transmission mechanism 9 is connected to the threaded seat 6 via a transmission mechanism. Pull rods 18 are fixedly connected to both sides of the upper mold base 1, one of which... A rack 17 is fixedly connected to one side of the mold 8. The rack 17 is connected to the transmission mechanism 9. The threaded sleeve 8 can move downward during the rotation of the threaded seat 6, so that the threaded seat 6 can be removed from the injection molded part during the rotation, which facilitates the subsequent unloading operation. The pull rod 18 can drive the rack 17 to move together during the movement of the upper mold base 1. The rack 17 drives the transmission mechanism 9 to run, so that the threaded seat 6 can be removed from the injection molded part when the upper mold base 1 and the lower mold base 2 are separated.

[0024] like Figure 3 and Figure 4 As shown, a mounting through hole 3 is provided through one side of the lower mold base 2. A driven plate 19 is slidably disposed inside the mounting through hole 3. Connecting blocks 20 are fixedly connected to both sides of the driven plate 19. One side of each of the two pull rods 18 is provided with a delay through hole 26. One side of each of the two connecting blocks 20 is slidably connected to the interior of the two delay through holes 26. A receiving groove 21 is provided on the bottom surface of the mold cavity 4 at the center position. A top plate 22 is inserted into the receiving groove 21. A push rod 23 is fixedly connected to the bottom end of the top plate 22. The bottom end of the push rod 23 passes through the top surface of the receiving groove 21 to the interior of the mounting through hole 3. By setting the delay through hole 26, the driven plate 19 can only be moved after the pull rod 18 has moved a certain distance. By setting the receiving groove 21, the top plate 22 can be stored to ensure that the top plate 22 will not affect the appearance of the injection molded part. By setting the push rod 23, the push rod 23 can be pushed upward during the movement of the driven plate 19 to achieve the demolding effect.

[0025] like Figure 4 As shown, four positioning rods 27 are fixedly connected to the top surface inside the mounting through hole 3. The outer surfaces of the four positioning rods 27 are slidably connected to the inside of the driven plate 19. By setting the positioning rods 27, the driven plate 19 is positioned, preventing skewing and improving stability.

[0026] like Figure 4As shown, the outer surface of the four positioning rods 27 is sleeved with a reset spring 28, the two ends of the reset spring 28 are respectively in contact with the top end of the driven plate 19 and the inner top surface of the mounting hole 3, and the driven plate 19 can be reset when the upper mold base 1 and the lower mold base 2 are combined.

[0027] As shown in Figure 3 and Figure 4 As shown, the outer surface of the top rod 23 is fixedly connected with a limiting ring 24, the outer surface of the limiting ring 24 is slidingly connected with the inner surface of the lower mold base 2, and the outer surface of the top rod 23 is sleeved with a pressing spring 25, the two ends of the pressing spring 25 are respectively in contact with the top end of the limiting ring 24 and the inner surface of the lower mold base 2, and the limiting ring 24 can block the pressing spring 25, so that the pressing spring 25 can generate a continuous force on the top rod 23, and the top plate 22 can be stably arranged in the storage groove 21.

[0028] As shown in Figure 2 , Figure 3 and Figure 5 As shown, the transmission mechanism 9 comprises a second transmission gear 10, the outer surface of the second transmission gear 10 is engaged with the outer surface of the first transmission gear 7, the top end of the second transmission gear 10 is fixedly connected with a third transmission gear 11, the outer surface of the third transmission gear 11 is engaged with a fourth transmission gear 12, the top end of the fourth transmission gear 12 is fixedly connected with a first bevel gear 13, the outer surface of the first bevel gear 13 is engaged with a second bevel gear 14, one end of the second bevel gear 14 is drivingly connected with a transmission shaft 15, one end of the transmission shaft 15 penetrates the inner surface of the lower mold base 2 and is fixedly connected with a driven gear 16, the outer surface of the driven gear 16 is engaged with one side of the rack 17, and the two ends of the second transmission gear 10, the third transmission gear 11 and the fourth transmission gear 12 are rotatably connected with the inner part of the lower mold base 2, so that the threaded seat 6 can be driven to rotate by cooperating with the rack 17.

[0029] As shown in Figure 2 As shown, the bottom end of the upper mold base 1 and the position close to the four corners are provided with a positioning groove 30, and the top end of the lower mold base 2 and the position close to the four corners are fixedly connected with a positioning column 29, the top end of the four positioning columns 29 is respectively inserted into the four positioning grooves 30, so that the upper mold base 1 and the lower mold base 2 can be matched with each other, and the precision during injection molding is improved.

[0030] The utility model provides a kind of automatic thread high-precision injection mold, specific working principle as follows:

[0031] After the injection molding is completed, the upper mold base 1 and the lower mold base 2 are separated, the upper mold base 1 drives the pull rod 18 to move together, so that the dislocation between the rack 17 and the driven gear 16 occurs and drives the driven gear 16 to rotate, makes the driven gear 16 drive the first transmission gear 7 to rotate through the transmission mechanism 9, drives the threaded seat 6 to rotate in the process of rotating the first transmission gear 7, under the action of the threaded sleeve 8, the bottom end of the threaded seat 6 gradually moves to the inside of the threaded sleeve 8 and exits from the inside of the injection molded part into the adjusting through hole 5, under the action of the delay through hole 26, the pull rod 18 moves a distance and drives the driven plate 19 to move in the installation through hole 3 and pushes the ejector rod 23 to move upward, the ejector rod 23 pushes the top plate 22 out of the storage groove 21, and the injection molded part after the thread is removed is ejected from the mold cavity 4, then the worker takes out the injection molded part from the inside of the mold cavity 4, and then performs the next injection molding, when the upper mold base 1 and the lower mold base 2 are combined, the driven plate 19 and the threaded seat 6 are reset under the action of the pull rod 18, the rack 17 and other components and perform injection molding.

[0032] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. An automatic unthreading high-precision injection mold comprising an upper mold base (1) and a lower mold base (2), characterized in that: The lower die seat (2) top end is provided with a cavity (4), the cavity (4) inside bottom surface is provided with an adjusting through hole (5), the adjusting through hole (5) inside is movably inserted with a threaded seat (6), the threaded seat (6) outer surface is fixedly connected with a first transmission gear (7), the threaded seat (6) bottom end is threadedly connected with a threaded sleeve (8), the lower die seat (2) is provided with a transmission mechanism (9), the transmission mechanism (9) and the threaded seat (6) are drivingly arranged, the upper die seat (1) both sides are fixedly connected with a pull rod (18), one of the pull rod (18) one side is fixedly connected with a rack (17), the rack (17) and the transmission mechanism (9) are drivingly arranged.

2. The automatic unthreading high-precision injection mold according to claim 1, characterized in that: The lower die seat (2) one side is provided with an installation through hole (3), the installation through hole (3) inside is slidably provided with a driven plate (19), the driven plate (19) both sides are fixedly connected with a connecting block (20), two pull rods (18) one side are provided with a delay through hole (26), two connecting blocks (20) one side are slidably connected with two delay through holes (26) respectively, the cavity (4) inside bottom surface and located at the center position is provided with a receiving groove (21), the receiving groove (21) inside is inserted with a top plate (22), the top plate (22) bottom end is fixedly connected with a top rod (23), the top rod (23) bottom end penetrates the receiving groove (21) inside top surface to the installation through hole (3) inside.

3. The automatic unthreading high-precision injection mold according to claim 2, characterized in that: The installation through hole (3) inside top surface is fixedly connected with four positioning rods (27), four positioning rods (27) outer surface is slidably connected with the driven plate (19) inside.

4. The automatic unthreading high-precision injection mold according to claim 3, characterized in that: Four positioning rods (27) outer surface are all sleeved with a reset spring (28), four reset springs (28) two ends are respectively abutted with the driven plate (19) top end and the installation through hole (3) inside top surface.

5. The automatic unthreading high-precision injection mold according to claim 4, characterized in that: The top rod (23) outer surface is fixedly connected with a limiting ring (24), the limiting ring (24) outer surface is slidably connected with the lower die seat (2) inside, the top rod (23) outer surface is sleeved with a pressing spring (25), the pressing spring (25) two ends are respectively abutted with the limiting ring (24) top end and the lower die seat (2) inner surface.

6. The automatic unthreading high-precision injection mold according to claim 1, characterized in that: The transmission mechanism (9) includes a second transmission gear (10), the outer surface of the second transmission gear (10) is engaged with the outer surface of the first transmission gear (7), the top end of the second transmission gear (10) is fixedly connected with a third transmission gear (11), the outer surface of the third transmission gear (11) is engaged with a fourth transmission gear (12), the top end of the fourth transmission gear (12) is fixedly connected with a first bevel gear (13), the outer surface of the first bevel gear (13) is engaged with a second bevel gear (14), one end of the second bevel gear (14) is drivingly connected with a transmission shaft (15), one end of the transmission shaft (15) penetrates the inner surface of the lower mold base (2) and is fixedly connected with a driven gear (16), the outer surface of the driven gear (16) is engaged with one side of the rack (17), and both ends of the second transmission gear (10), the third transmission gear (11) and the fourth transmission gear (12) are rotatably connected with the lower mold base (2).

7. The automatic unthreading high-precision injection mold according to claim 6, characterized in that: The bottom end of the upper mold base (1) and the positions close to four corners are provided with positioning grooves (30), and the top end of the lower mold base (2) and the positions close to four corners are fixedly connected with positioning columns (29), and the top ends of the four positioning columns (29) are respectively inserted into the interiors of the four positioning grooves (30).

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