The content of the invention
The present invention in order to overcome the deficiencies of the prior art and provide it is a kind of be hardly damaged, plastics injection mould easy to maintenance.
To achieve these goals, the present invention uses following technical scheme：A kind of plastics injection mould, including upper mold, under
Mould is arranged on core and thimble between upper and lower mould；Primary demolded parts are equipped between the core and the lower die；The lower die
Thimble positioning element is equipped with, two stage mold unloading component is equipped between the thimble positioning element and the core；It is set on the core
There is the injection molding cavity passed through for thimble, the thimble is equipped with and the matched fastener of workpiece；The fastener by connection structure with
The thimble is detachably connected；When carrying out stripping operation, the primary demolded parts drive the fastener and the work first
Part departs from, and two stage mold unloading component driving workpiece departs from the injection molding cavity afterwards.The present invention sets primary and secondary demolded parts,
So as to realize step demoulding processing to workpiece, when demoulding for the first time, control fastener is first departed from workpiece, is controlled again afterwards
Workpiece and injection molding cavity depart from, and when fastener is demoulded with workpiece, workpiece remains motionless, and thimble vertical shift, ensure fastener vertically by
It spins off on workpiece；For comparing the situation that traditional travelling workpiece realizes the demoulding, fastener is less prone to what is bent or fracture
Situation is hardly damaged, and service life is long；And since workpiece uses secondary stripping operation, every time during the demoulding, between mold and workpiece
The pulling force, the active force that receive etc. are all smaller, and workpiece shaping integrity degree is high, and burn failure rate is low；The setting of power-assist structure so that top
Frictional force between pin and injection molding cavity is effectively reduced, thus when jacking workpiece, more smoothly and rapid, stripping result
It is good;It, can be individually to fastener when fastener occurs bending or fracture by being detachably connected between fastener and thimble
It is replaced, extends the service life of equipment entirety.
Further, the primary demolded parts include support block, demould column, is matched with the demoulding column on core
Movable chamber, the demoulding chamber on the support block and the elastic component arranged on demoulding intracavitary；The demoulding column lower part and the lower die phase
Even, the top for demoulding column is arranged in the movable chamber；When demoulding for the first time, lower die is moved downward with respect to core, at this time support block
It is moved in movable chamber, and then holding core, on motionless position, thimble follows lower die to move down together at this time, from
And so that the fastener of thimble end and workpiece disengage, realize the demoulding between thimble and workpiece.
Further, the elastic component is sheathed on outside the demoulding column, which acts on the core, separately
One end acts on the demoulding bottom of chamber wall；Elastic component can give core upward support force always during lower die moves down,
Avoid core that lower die is followed to move downwardly together.
Further, it is equipped in the support block and demoulds the matched straight slot of column with described, which is equipped with and institute
Matched first anti-falling piece of movable chamber is stated, lower part is equipped with the second anti-falling piece；The support block is equipped with and second anti-falling piece
Matched holding tank, the holding tank are connected with the straight slot, and second anti-falling piece is embedded in the holding tank.
Further, the thimble positioning element include be arranged on the lower die on the first positioning plate and with this first positioning
The second positioning plate that plate is detachably connected is equipped with support column between first positioning plate and the core；It is real by support column
Now the support of core is positioned.
Further, the two stage mold unloading component includes being arranged on the opening passed through for the thimble on second positioning plate
It slot, the through hole passed through on first positioning plate for the thimble, the elastic telescopic part in the open slot and is arranged on
Thimble lower part and the matched limiting section of the lower die；During lower die moves down, elastic telescopic part continues to the second positioning plate
Downward support force is acted on, the support positioning to core is further improved, prevents core from being moved when lower die moves, ensure
Thimble realizes fast demoulding with workpiece；When the first anti-falling piece that lower die is moved on demoulding column is inconsistent with movable chamber, the demoulding
Column will start that core is driven to move down, and when core and positioning element are moved to inconsistent with mandril, mandril is by the second positioning
Plate jacks up upwards, and the second positioning plate drives the first positioning plate and support column to move up, and will be extend out to so as to the top of support column
Core upper surface, and then by workpiece by being jacked up on core so that it is disengaged between workpiece and injection molding cavity, realizes the secondary demoulding；Due to
The setting of elastic telescopic part so that for mandril when jacking positioning element, elastic telescopic part can also give positioning element upward work
Firmly, so that the jacking of positioning element is more smoothly, the demoulding is more smooth.
Further, the support column lower part is equipped with and the matched anti-delinking part of the first positioning plate；Pass through anti-delinking part
Cooperation, ensure that support column and the first positioning plate can realize synchronizing moving, during workpiece is jacked, support column will not be by
Deviate from first positioning plate.
Further, it is equipped with a mandril below the lower die.
Further, the connection structure includes the connector sleeve, the interior spiral shell arranged on connector sleeve inner wall that are connected with the fastener
Line and the external screw thread in the thimble external wall of upper portion；It is simple in structure by the fit system being spirally connected, convenient disassembly, repair
It is easy to operate.
In conclusion the present invention has the following advantages：Primary and secondary demolded parts are set, are divided so as to be realized to workpiece
Demoulding processing is walked, since workpiece is using secondary stripping operation, every time during the demoulding, the pulling force that is received between mold and workpiece, effect
Power etc. is all smaller, and workpiece shaping integrity degree is high, and burn failure rate is low.
In order to which those skilled in the art is made to be better understood from the present invention program, below in conjunction in the embodiment of the present invention
Attached drawing carries out the technical solution in the embodiment of the present invention clear, complete description.
As shown in Figs. 1-2, a kind of plastics injection mould, including upper mold 1, lower die 2, the core 3 between upper and lower mould and
Thimble 4；Primary demolded parts are equipped between the core 3 and the lower die 2；The lower die 2 is equipped with thimble positioning element 5,
Two stage mold unloading component is equipped between the thimble positioning element 5 and the core 3；It is worn specifically, the core 3 is equipped with for thimble
The injection molding cavity 31 crossed, the thimble 4 be equipped with fastener 41 matched with workpiece, the fastener 41 by connection structure with it is described
Thimble 4 is detachably connected；The connection structure includes the connector sleeve 42 being connected with the fastener 41, in 42 inner wall of connector sleeve
Screw thread and the external screw thread in 4 external wall of upper portion of thimble, connector sleeve lower part are to be set in opening；Pass through matching somebody with somebody for internal and external threads
Conjunction, realization fastener and thimble are spirally connected, convenient for being replaced to fastener；When carrying out stripping operation, the primary demolded parts
The fastener 41 is driven to depart from the workpiece first, the workpiece of two stage mold unloading component driving afterwards departs from the injection molding cavity 31；
Secondary stripping operation in this way avoids causing the bending or fracture of fastener during demoulding.
Specifically, the primary demolded parts include support block 61, demoulding column 62, movable chamber 63, demoulding chamber 64 and elasticity
Part 65, the support block 61 are arranged between core and lower die, and the demoulding column 62 is arranged in the support block 61, and the movable chamber 63 is set
Be equipped in being engaged on core with the demoulding column, in the support block 61 with the demoulding matched straight slot of column, on the demoulding column
It is penetrated after holding through straight slot to movable chamber 63, the demoulding 62 lower part of column is connected with the lower die 2；Further, the demoulding column 62
Top is equipped with is equipped with the second anti-falling piece 622, first anti-falling piece with matched first anti-falling piece 621 of the movable chamber, lower part
621 and second anti-falling piece 622 be respectively demould 62 outer wall of column direct out the flange extended to form；The demoulding chamber 64 demoulds chamber
64, the elastic component 65 is spring, which is arranged on demoulding intracavitary, and elastic component 65 is sheathed on outside the demoulding column 62, should
65 one end of elastic component is acted on the core 3, and the other end acts on the demoulding 64 bottom wall of chamber；Preferably, the support block
61 be equipped with the 622 matched holding tank of the second anti-falling piece, which is connected with the straight slot, and described second prevents
De- part 622 is embedded in the holding tank.
The thimble positioning element 5 includes the first positioning plate 51 and the second positioning plate 52, first positioning plate 51 and the
Two positioning plates 52 are arranged in the lower die, and first positioning plate and the second positioning plate 52 are removably attachable to one by screw
It rises, and support column 7 is equipped between first positioning plate 51 and the core 3；The two stage mold unloading component include open slot 81,
Through hole, elastic telescopic part 82 and limiting section 83；The open slot 81 is arranged on second positioning plate 52, for the thimble
It passing through, the elastic telescopic part 82 is spring, which is arranged in the open slot 81, the one of elastic telescopic part 82
End acts on open slot and determines wall, and the other end is acted in lower die；The through hole is arranged on first positioning plate 51, for described
Thimble passes through；The limiting section 83 is arranged on thimble lower part, is directed out for thimble lower sides and extends to form flange, the limiting section
Can be engaged with the lower die prevents thimble from moving up disengagement lower die；
Preferably, 7 lower part of support column be equipped with the matched anti-delinking part 71 of first positioning plate, which is
7 lower part of support column directs out the circle protrusion extended to form, which is embedded in the first positioning plate；Further,
2 lower section of lower die is equipped with a mandril 9, which is the mandril of injection molding machine, is no longer excessively repeated for the prior art；Injection mould
Other structures are that the prior art can be realized, no longer excessively repeat.
In order to reduce the frictional force between 31 inner wall of thimble 4 and the injection molding cavity, we are in thimble 4 and the injection molding cavity 31
Power-assist structure is provided between inner wall；The power-assist structure includes the multiple ball chambers 101 being arranged on the thimble and arranged on the rolling
The ball 102 of pearl intracavitary, the ball 102 are made of stainless steel, and the opening of ball chamber 101 is located on thimble side wall, opening
Size is less than the diameter of ball, so as to ensure that ball part extend out to 4 outer wall of thimble, but not drops out；Further,
At the top of thimble straight slot can be set to be connected with the ball chamber, ball can be put by the straight slot to ball intracavitary.
Obviously, described embodiment is only the part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment should all belong to the scope of protection of the invention.