CN115352001A

CN115352001A - Hardware fitting and injection molding equipment thereof

Info

Publication number: CN115352001A
Application number: CN202211278299.8A
Authority: CN
Inventors: 杨小斌
Original assignee: Taizhou Municipal Front Injection Molding Co ltd
Current assignee: Wang Houwen
Priority date: 2022-10-19
Filing date: 2022-10-19
Publication date: 2022-11-18

Abstract

The invention is suitable for the technical field of injection molds, and provides a hardware fitting and injection molding equipment thereof.A traditional wrap angle with a triangular side surface is modified into a wrap angle with an additional semicircular part on the side surface, so that the contact area with an object is increased, the punching area is also increased, the arrangement of hole positions can be increased on each side surface, and the wrap angle and the object are more firmly installed; all edges and corners are rounded in a matched mode, so that the whole hardware fitting corner wrapping is more smooth, and an installer cannot be injured by sharp parts during installation. The side surface of an inner rod at the input end of a hydraulic cylinder for controlling the lifting of the upper die is provided with a first tooth groove, the side surface of the first tooth groove is provided with a transfer gear of an extrusion piece, and the transfer gear drives a rack and the extrusion rod to reversely lift, so that when the upper die lifts, the extrusion rod reversely lifts, namely when the upper die descends and is matched with the upper die, the extrusion rod moves upwards to match the upper die; when the upper die ascends for demoulding, the extrusion rod descends to push the hardware fitting to demould with the upper die.

Description

Hardware fitting and injection molding equipment thereof

Technical Field

The invention belongs to the technical field of injection molds, and particularly relates to a hardware fitting and injection molding equipment thereof.

Background

The wrap angle of the existing hardware fittings is generally formed by combining three sub-wrap angle parts of which the surface angles are isosceles right triangles and is used for being arranged on external contour corners of various objects such as boxes, magazines, bags and the like to play roles of protection, decoration and the like. Because it comprises trilateral isosceles right triangle to the edges and corners on each side is more, causes the fish tail or stabs etc. to the installer easily when the installation, simultaneously because its triangle area is restricted, and is little with object area of contact, and the position that can the trompil is also less by bolted fixation's position, thereby leads to a plurality of object joint firmness of its installation to receive certain influence. The concrete combination form of each sub-cornerite spare can be through welding or two kinds of modes of moulding plastics integrated into one piece, but because it is fixed inconvenient during the welding between two adjacent sub-cornerite spares, lead to the welding comparatively troublesome difficulty.

Thereby this application designs an edges and corners is less, and the bigger cornerite of installation area to and carry out the equipment that quick mould injection moulding was made to this middle package angle.

Disclosure of Invention

The invention provides a hardware fitting and injection molding equipment thereof, and aims to solve the problems in the background art.

The hardware fitting is realized in the way that the three-side wrap angle is formed by integral injection molding, each side edge of the wrap angle is additionally provided with a semicircular part for increasing the hole opening range, and each corner of the wrap angle is subjected to fillet treatment.

The invention is realized in such a way that hardware fitting injection molding equipment is used for injection molding and manufacturing the hardware fitting and comprises a lower mold and an upper mold, wherein the upper mold is controlled to lift through a hydraulic cylinder, a first tooth groove is formed in the side surface of one level of a telescopic loop bar of the hydraulic cylinder, the first tooth groove drives extrusion pieces to synchronously and reversely move through a plurality of transfer gears respectively, the extrusion pieces are used for demolding the injection-molded hardware fitting, one of the extrusion pieces is provided with a small section of second tooth groove, and the second tooth groove drives the control pieces to control the opening and closing of an injection molding pipeline.

Preferably, the upper die and the lower die are both arranged in a ninety-degree angle bead shape, the cavity between the two closed parts is used for injection molding of the hardware fitting, the lower die is fixed on the bottom plate through the supporting table, the cooling cavity is arranged inside the lower die, and a water gap communicated with an external water source through a pipeline is formed in the bottom of the cooling cavity.

Preferably, a support is mounted on the bottom plate, an inverted hydraulic cylinder is arranged on the support, the lower end of the innermost inner rod of the telescopic loop bar of the hydraulic cylinder is fixedly connected with the upper die, an injection molding inlet is formed in the upper end of the upper die, and an injection molding flow passage is formed in the upper die and communicated with the die cavity.

Preferably, every the extruded article all including fixing the mounting bracket of support bottom surface, rotate in the middle of this mounting bracket and be provided with the transfer gear, the extrusion pole is still installed to spacing on this mounting bracket, and the side of this extrusion pole is provided with the rack, the multiunit has been seted up to the outside wall ring shape of interior pole equidistant first tooth's socket, every first tooth's socket is all through one the transfer gear meshing drives the correspondence the rack.

Preferably, the lower extreme of pressure stem gos deep into the inside of last mould, just the bottom of pressure stem sets up the swash plate for promote the hardware fitting who moulds plastics and accomplish to break away from last mould, this swash plate with go up the chute looks adaptation that the mould is inside to be seted up.

Preferably, the upper end of the bracket is provided with an access port of an injection molding liquid input pipe, the access port is communicated with the injection molding inlet on the upper mold through an injection molding pipeline, and the middle of the injection molding pipeline is provided with a ball valve of a control part for controlling injection molding liquid.

Preferably, a transmission gear of a control part is further mounted on the mounting frame of one of the extrusion pieces, a small section of the second tooth groove is arranged at a position, close to the top, of the side face of the extrusion rod on the mounting frame, the transmission gear is meshed with the second tooth groove, the transmission gear drives a clockwork spring to tighten and open the ball valve through a rotating rod, and the clockwork spring loosens and closes the ball valve.

Preferably, the extrusion members are provided with three groups, respectively corresponding to three sides of the upper die.

Compared with the prior art, the invention has the beneficial effects that: according to the hardware fitting and the injection molding equipment thereof, the traditional wrap angle with the triangular side surface is modified into the one with the semicircular part additionally arranged on the side surface, so that the contact area with an object is increased, the punching area is increased, the arrangement of hole positions can be increased on each side surface, and the wrap angle and the object are more firmly installed; on the other hand, each edge and each corner are matched to be subjected to fillet treatment, so that the whole hardware fitting corner wrap is more smooth, the safety is guaranteed because sharp parts hurt an installer and a subsequent user when the hardware fitting is installed, and the attractiveness is improved.

(2) The side surface of an inner rod at the input end of a hydraulic cylinder for controlling the lifting of the upper die is provided with a first tooth groove, the side surface of the first tooth groove is provided with a transfer gear of an extrusion piece, and the transfer gear drives a rack and the extrusion rod to reversely lift, so that when the upper die lifts, the extrusion rod reversely lifts, namely when the upper die descends and is matched with the upper die, the extrusion rod moves upwards to match the upper die; when the upper die ascends for demolding, the extrusion rod descends to push the hardware fitting and the upper die to demold, the full-automatic and quick demolding operation is realized, and the independent control is not needed by redundant power.

(3) Meanwhile, when an upper die descends to complete die assembly, the extrusion rod moves upwards to drive the transmission gear to rotate through the second tooth groove on the side face, the transmission gear drives the rotating rod to rotate through the one-way bearing, the rotating rod drives the clockwork spring to tighten and controls the ball valve for opening and closing the injection molding pipeline to be opened, when the extrusion rod moves to the top, the lower end of the second tooth groove is separated from the transmission gear, the clockwork spring is released under the condition without resistance and drives the ball valve to be closed through the rotating rod, full-automatic quantitative injection molding is achieved, the controlled power is transmitted by the extrusion rod, and then a plurality of different parts are controlled through one hydraulic cylinder to perform synchronous motion, and synchronous motion of each part is achieved.

Drawings

FIG. 1 is a first schematic perspective view of a hardware fitting according to the present invention;

FIG. 2 is a schematic perspective view of a hardware fitting according to the present invention;

FIG. 3 is a schematic perspective view of an injection molding apparatus according to the present invention;

FIG. 4 is a schematic front view of the injection molding apparatus of the present invention;

FIG. 5 isbase:Sub>A schematic view of the cross-sectional structure taken along the line A-A in FIG. 4;

FIG. 6 is a schematic side view of the injection molding apparatus of the present invention;

FIG. 7 is a schematic top view of an extrusion of the present invention;

in the figure

1. Wrapping corners; 11. a semicircular portion;

2. an upper die; 21. an injection molding inlet; 22. injection molding a runner; 23. a chute;

3. a lower die; 31. a support table; 32. a cooling chamber; 33. a water gap;

4. a base plate;

5. a support;

6. a hydraulic cylinder; 61. a telescopic loop bar; 62. an inner rod; 63. a first tooth slot;

7. an extrusion; 71. a mounting frame; 72. a transfer gear; 73. an extrusion stem; 74. a rack; 75. a sloping plate; 76. a second tooth slot;

81. an access port; 82. injecting a pipeline; 83. a ball valve; 84. a transmission gear; 85. a rotating rod; 86. a clockwork spring;

9. a mold cavity.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a hardware fitting, integrative injection moulding's trilateral cornerite 1, each side of this cornerite 1 increases and is equipped with semicircle portion 11 for increase the trompil scope, and each corner of this cornerite 1 all makes fillet processing.

It is to be noted that; through being revised as the semicircle part 11 into the side for triangle-shaped cornerite 1 with traditional side, set up like this and increased the area of contact with the object, still increased the area of punching for each side can increase the setting and the quantity of hole site, make more firm of cornerite 1 and object installation.

Each side of cornerite 1 has add 11 cooperation of semicircle parts and has done the fillet with each limit, angle and handle for whole hardware fitting cornerite 1 is more mellow, can not guarantee safety when the installation because sharp-pointed portion injures installer and subsequent user.

Referring to fig. 1, the present invention provides a technical solution: the utility model provides a hardware fitting injection moulding equipment, a hardware fitting for injection moulding makes foretell hardware fitting, including lower mould 3 and last mould 2, it goes up and down to go up mould 2 through 6 its lifts of pneumatic cylinder control, one of them one-level body of rod side of the flexible loop bar 61 of this pneumatic cylinder 6 is provided with first tooth's socket 63, this first tooth's socket 63 drives the synchronous reverse motion of each extruded article 7 respectively through a plurality of transfer gears 72, this extruded article 7 is used for carrying out the drawing of patterns to the hardware fitting of accomplishing of moulding plastics, be provided with a segment second tooth's socket 76 on one of them extruded article 7, this second tooth's socket 76 drives opening and close of control injection moulding pipeline 82.

Further, the method comprises the following steps of; the side surface of the inner rod 62 at the input end of the hydraulic cylinder 6 for controlling the lifting of the upper die 2 is provided with a first tooth groove 63, the side surface of the first tooth groove 63 is provided with a transfer gear 72 of the extrusion part 7, and the transfer gear 72 drives the rack 74 and the extrusion rod 73 to reversely lift, so that when the upper die 2 lifts, the extrusion rod 73 reversely lifts, namely when the upper die 2 descends and is matched with the die, the extrusion rod 73 moves upwards and is matched with the die; when the upper die 2 ascends for demolding, the extrusion rod 73 descends to push the hardware fitting to demold with the upper die 2, full-automatic and quick demolding operation is performed, unnecessary power is not needed for independent control, further when the upper die 2 descends to complete mold closing, the extrusion rod 73 upwards moves to drive the transmission gear 84 to rotate through the second tooth groove 76 on the side face, the transmission gear 84 drives the rotating rod 85 to rotate through the one-way bearing, the rotating rod 85 drives the clockwork spring 86 to tighten and control the ball valve 83 for opening and closing the injection molding pipeline 82 to be opened, when the extrusion rod 73 moves to the uppermost end, the second tooth groove 76 is separated from the transmission gear 84, the clockwork spring 86 is released under the condition without resistance and drives the ball valve 83 to be closed through the rotating rod 85, and full-automatic and quantitative injection molding is achieved.

Go up mould 2 and bed die 3 and all set up to ninety degrees angle bead form, and the both fold die cavity 9 between the back and be used for moulding plastics this hardware fitting, and wherein bed die 3 fixes on bottom plate 4 through a supporting bench 31, and bed die 3 is inside to be provided with cooling chamber 32 to be provided with mouth of a river 33 in its bottom and be linked together through pipeline and external water source. The bottom plate 4 is provided with a bracket 5, the bracket 5 is provided with an inverted hydraulic cylinder 6, the lower end of an innermost inner rod 62 of a telescopic loop bar 61 of the hydraulic cylinder 6 is fixedly connected with the upper die 2, the upper end of the upper die 2 is provided with an injection inlet 21, and an injection runner 22 is arranged in the upper die and communicated with the die cavity 9.

In order to process the corner wrap 1 of the hardware, the upper mold 2 and the lower mold 3 need to be set in a ninety-degree corner guard shape, so that the internal cavity 9 is in the shape of the corner wrap 1, and the corner wrap 1 can be formed by injection molding. The support base 31 is provided in an elastically liftable and lowerable manner so as to be released from the upper die 2 in cooperation with the upper pressing member 7. Further, when the extrusion rod 73 is connected to the lower die 3, the lower die 3 is synchronously driven to descend by the ascending of the upper die 2, and the upper die 3 and the lower die 3 move simultaneously to realize the demoulding operation of the hardware fittings.

The extrusion members 7 are provided with three sets corresponding to three sides of the upper die 2, respectively. Every extruded article 7 all includes fixing the mounting bracket 71 in support 5 bottom surface, and this mounting bracket 71 middle rotation is provided with transfer gear 72, and the spacing installation has extrusion pole 73 on this mounting bracket 71 still, and the side of this extrusion pole 73 is provided with rack 74, and the first tooth's socket 63 of multiunit has been seted up to the outer lateral wall annular of interior pole 62 equidistant, and every first tooth's socket 63 all drives corresponding rack 74 through a transfer gear 72 meshing. The lower end of the extrusion rod 73 extends into the upper die 2, an inclined plate 75 is arranged at the bottom of the extrusion rod 73 and used for pushing the hardware fittings finished by injection molding to be separated from the upper die 2, and the inclined plate 75 is matched with the inclined groove 23 formed in the upper die 2.

Specifically, the method comprises the following steps of; because last mould 2 and lower mould 3 are for the shape of adaptation hardware fitting cornerite 1 to be ninety degrees angle bead form with its side, make its side have three face, and then extrusion 7 sets up three groups and corresponds the three side of going up mould 2 respectively, thereby extrusion pole 73 among three groups of extrusion 7 all pushes one of them side and the last mould 2 of hardware fitting and break away from through the swash plate 75 of bottom when descending, accomplishes the drawing of patterns operation of hardware fitting cornerite 1 and last mould 2. In the specific operation process, the inner rod 62 in the telescopic loop bar 61 does lifting movement under the action of the hydraulic cylinder 6, because the side wall of the inner rod 62 is provided with the first tooth groove 63, the first tooth groove 63 is meshed with the toothed plate through the transfer gear 72, and the toothed plate is fixed with the extrusion rod 73, so that the lifting of the inner rod 62 drives the toothed plate and the extrusion rod 73 to reversely lift, and further when the inner rod 62 drives the upper mold 2 to descend and close the mold, the toothed plate extrusion rod 73 reversely rises, the inclined plate 75 is embedded with the inclined groove 23 of the upper mold 2, otherwise, when the inner rod 62 drives the upper mold 2 to ascend and de-mold, the toothed plate extrusion rod 73 reversely falls to separate the inclined plate 75 from the inclined groove 23 of the upper mold 2, and pushes hardware fittings inside the upper mold 2, the lower mold 3 and the supporting table 31 to descend.

The upper end of the bracket 5 is provided with an inlet 81 of an injection liquid input pipe, the inlet 81 is communicated with the injection inlet 21 on the upper mold 2 through an injection pipeline 82, and the middle of the injection pipeline 82 is provided with a ball valve 83 of a control part for controlling injection of injection liquid. A transmission gear 84 of a control member is further mounted on the mounting frame 71 of one extrusion member 7, a small section of second tooth groove 76 is formed in the position, close to the top, of the side surface of the extrusion rod 73 on the mounting frame 71, the transmission gear 84 is meshed with the second tooth groove 76, the transmission gear 84 drives a spring 86 to tighten and open a ball valve 83 through a rotating rod 85, and the spring 86 loosens and closes the ball valve 83.

Generally; the injection liquid enters the injection pipeline 82 through the inlet 81 along the input pipe, then is intercepted by the ball valve 83, and when the ball valve 83 is opened, enters the injection inlet 21 of the upper die 2 along the injection pipeline 82 through the ball valve 83, then enters the injection runner 22 of the upper die 2, finally enters the cavity 9 formed by the upper die 2 and the lower die 3, and is filled with the injection liquid to complete injection. The opening of the ball valve 83 is realized by moving the second tooth groove 76 upwards to drive the transmission gear 84 to rotate, the transmission gear 84 drives the rotating rod 85 to rotate through the one-way bearing, the rotating rod 85 drives the clockwork spring 86 to tighten and simultaneously drives the ball valve 83 to open, then the lower end of the second tooth groove 76 is separated from the transmission gear 84, the clockwork spring 86 is released automatically without resistance, the clockwork spring 86 is released to slowly close the ball valve 83 through the rotating rod 85, so that the release speed of the clockwork spring 86 is related to the filling speed of the cavity 9, and the fact that the cavity 9 is just filled when the clockwork spring 86 closes the ball valve 83 can be realized. Meanwhile, as the one-way bearing is arranged between the rotating rod 85 and the transmission gear 84, the rotating rod 85 rotates when the transmission gear 84 is driven to rotate by the upward movement of the second tooth groove 76, otherwise, the rotating rod 85 does not rotate when the transmission gear 84 is driven to rotate by the downward movement of the second tooth groove 76, and further, the clockwork spring 86 and the ball valve 83 are not operated. Wherein the transmission gear 84 is not subjected to resistance due to the limited length of the second gear groove 76 when the clockwork 86 is released, so as to ensure the normal release of the clockwork 86.

The working principle and the using process of the invention are as follows: after the invention is installed, during injection molding, the hydraulic cylinder 6 is started first, the hydraulic cylinder 6 controls the extension of the telescopic loop bar 61, the inner rod 62 descends, the descending of the inner rod 62 drives the upper mold 2 to descend, meanwhile, the descending of the inner rod 62 drives each transfer gear 72 to rotate through the first tooth space 63, each transfer gear 72 drives each corresponding rack 74 to move upwards, so that the extrusion rod 73 fixedly connected with the rack 74 moves upwards, when the upper mold 2 descends to be matched with the lower mold 3, the inclined plate 75 at the lower end of the extrusion rod 73 is in inserted fit with the inclined groove 23 in the upper mold 2, a complete cavity 9 is formed between the upper mold 2 and the lower mold 3, meanwhile, due to the upward movement of the extrusion rod 73, the second tooth groove 76 on the extrusion rod 73 drives the transmission gear 84 to rotate, the transmission gear 84 tightens the spring 86 and rotates and opens the ball valve 83, when the extrusion rod 73 moves to the uppermost position, the lower end of the second tooth groove 76 is not in contact with the transmission gear 84, so that the spring 86 is released, the spring 86 releases and drives the ball valve 83 to reversely rotate through the rotating rod 85 to slowly close the ball valve 83, in the opening process of the ball valve 83, injection molding liquid is injected into the cavity 9 through the injection molding pipeline 82, then cooling water is injected into the cooling cavity 32 in the lower die 3, and the injection molding work of the hardware fitting is realized,

during demolding, the hydraulic cylinder 6 is started, the hydraulic cylinder 6 controls the telescopic sleeve rod 61 to contract, the inner rod 62 is lifted, the lifting of the inner rod 62 drives the upper mold 2 to lift along with the lifting, meanwhile, the lifting of the inner rod 62 drives each transfer gear 72 to rotate reversely through the first toothed slot 63, each transfer gear 72 drives each corresponding rack 74 to move downwards, so that the extrusion rod 73 fixedly connected with the rack 74 moves downwards, when the upper mold 2 and the lower mold 3 are separated, the inclined plate 75 at the lower end of the extrusion rod 73 is separated from the inclined slot 23 in the upper mold 2, each extrusion rod 73 pushes the hardware from the upper mold 2 through each inclined plate 75, so that the hardware, the lower mold 3 and the support platform 31 are lowered, demolding of the hardware and the upper mold 2 is completed, meanwhile, the second rack 74 is meshed with the transmission gear 84 after the extrusion rod 73 is lowered, the transmission gear 84 is driven to turn over, but the transmission gear 84 is connected with the rotary rod 85 through a one-way bearing, so that the rotary rod 85 does not rotate, the rotary spring 86 and the injection ball valve 83 do not rotate, and injection liquid cannot flow out. Afterwards, the hardware fitting is taken down from the lower die 3 through tools manually, and holes are formed in the hardware fitting in a polishing mode, so that the hardware fitting can be machined.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a hardware fitting which characterized in that: the three-side wrap angle (1) is integrally formed by injection molding, each side edge of the wrap angle (1) is additionally provided with a semicircular part (11) for increasing the hole opening range, and each corner of the wrap angle (1) is subjected to fillet treatment.

2. A hardware fitting injection molding device for injection molding the hardware fitting of claim 1, wherein: including bed die (3) and last mould (2), it goes up and down to go up mould (2) through pneumatic cylinder (6) control it, and one of them one-level body of rod side of telescopic loop bar (61) of this pneumatic cylinder (6) is provided with first tooth's socket (63), and this first tooth's socket (63) drive synchronous reverse motion of each extruded article (7) respectively through a plurality of transfer gears (72), and this extruded article (7) are used for drawing of patterns to the hardware fitting of moulding plastics completion, one of them be provided with a subsection second tooth's socket (76) on extruded article (7), and this second tooth's socket (76) drive the control and mould plastics opening and close of pipeline (82).

3. The hardware fitting injection molding apparatus of claim 2, wherein: go up mould (2) and bed die (3) and all set up to ninety degrees angle bead form, and cavity (9) between the back is foldd to both are used for moulding plastics this hardware fitting, wherein bed die (3) are fixed on bottom plate (4) through brace table (31), bed die (3) inside is provided with cooling chamber (32) to be provided with mouth of a river (33) in its bottom and be linked together through pipeline and external water source.

4. The hardware fitting injection molding apparatus of claim 3, wherein: the injection molding device is characterized in that a support (5) is installed on the bottom plate (4), an inverted hydraulic cylinder (6) is arranged on the support (5), the lower end of an innermost-stage inner rod (62) of a telescopic loop bar (61) of the hydraulic cylinder (6) is fixedly connected to the upper die (2), an injection molding inlet (21) is formed in the upper end of the upper die (2), and an injection molding flow passage (22) is formed in the upper die and communicated with the cavity (9).

5. The hardware fitting injection molding apparatus of claim 4, wherein: each extrusion part (7) comprises a mounting rack (71) fixed on the bottom surface of the support (5), the transfer gear (72) is rotatably arranged in the middle of the mounting rack (71), an extrusion rod (73) is also installed on the mounting rack (71) in a limiting way, a rack (74) is arranged on the side surface of the extrusion rod (73),

a plurality of groups of first tooth grooves (63) are annularly and equidistantly formed in the outer side wall of the inner rod (62), and each first tooth groove (63) is meshed with and drives the corresponding rack (74) through one transfer gear (72).

6. The hardware fitting injection molding apparatus of claim 5, wherein: the lower end of the extrusion rod (73) extends into the inner part of the upper die (2), an inclined plate (75) is arranged at the bottom of the extrusion rod (73) and used for pushing hardware fittings finished by injection molding to be separated from the upper die (2), and the inclined plate (75) is matched with an inclined groove (23) formed in the upper die (2).

7. The hardware fitting injection molding apparatus of claim 5, wherein: support (5) upper end is provided with inserts mouth (81) of moulding plastics liquid input tube, should insert mouth (81) and through moulding plastics pipeline (82) intercommunication go up on mould (2) mould plastics entry (21), and be provided with ball valve (83) of control in the middle part of moulding plastics pipeline (82) for the control is moulded plastics the injection of liquid.

8. The hardware fitting injection molding apparatus of claim 7, wherein: a transmission gear (84) of a control part is further mounted on the mounting frame (71) of one of the extrusion pieces (7), a small section of second tooth groove (76) is arranged at a position, close to the top, of the side face of the extrusion rod (73) on the mounting frame (71), the transmission gear (84) is meshed with the second tooth groove (76), the transmission gear (84) drives a clockwork spring (86) to tighten and open the ball valve (83) through a rotating rod (85), and the clockwork spring (86) loosens and closes the ball valve (83).

9. The hardware fitting injection molding apparatus of claim 2, wherein: the three groups of the extrusion pieces (7) are respectively corresponding to three side surfaces of the upper die (2).