TWI618618B - Two-way ejection mechanism for injection molding machine - Google Patents

Abstract

A bidirectional ejection mechanism for an injection molding machine, comprising a mold base unit capable of mounting two molds, an ejection unit mounted on the mold base unit, and a driving unit installed between the mold base unit and the ejection unit. The ejector unit includes a first ejector module and a second ejector module disposed in the die base unit. The driving unit can drive the first ejecting module and the second ejecting module to be displaced back and forth, so that the plurality of first ejecting rods and the plurality of second ejecting rods are inserted back and forth out of the die holder unit In the mold. Through the structural design of the die holder unit, the ejection unit and the driving unit, the injection molding machine adopting the bidirectional ejection mechanism of the invention can simultaneously perform two injection molding operations and demolding operations of the finished product, and can greatly improve the manufacturing process. The production efficiency of the injection molding machine.

Description

Two-way ejection mechanism for injection molding machine

The present invention relates to an injection molding machine, and more particularly to a two-way ejection mechanism for an injection molding machine.

The current clamping mechanism of the injection molding machine generally comprises a fixed mold base provided with a mold, and one set with another mold and can be driven to move to the fixed mold base to clamp the two molds for plastic injection molding. The movable mold base, and the movable mold base is provided with an ejector unit for ejecting the finished product formed in the mold. Due to the structural design of the movable mold base, the conventional injection molding machine has only been able to shoot a single finished product every time it is formed by injection molding. Therefore, how to improve the production efficiency of the injection molding machine is the goal of many operators.

Accordingly, it is an object of the present invention to provide a two-way ejection mechanism that improves at least one of the disadvantages of the prior art.

Thus, the bidirectional ejection mechanism of the present invention for an injection molding machine is suitable for mounting two molds which can respectively be used for plastic injection molding. The two-way ejection mechanism comprises a die base unit, an ejection unit mounted on the die base unit, and a driving unit mounted between the die holder unit and the ejection unit. The die holder unit includes a first fixing seat and a second fixing seat that cooperate with each other to define an installation space, and at least one guiding shaft extending forward and backward on the first fixing seat and the second fixing seat The first fixing seat and the second fixing seat can be respectively installed on the back side of the molds before and after the two molds are exposed, the at least one guiding shaft is exposed in the installation space, and the first fixing seat has a plurality of The first through holes are connected to the installation space, and the second fixing seat has a plurality of spaced apart distributions and extends through the second through holes communicating with the installation space. The ejector unit includes a first ejector module and a second ejector module that are disposed on the at least one guiding axis and are located in the installation space. The first ejector module has a plurality of The first ejector rods are inserted forwardly into the first perforations, and the second ejecting module has a plurality of second ejector rods respectively extending backwardly and inserted into the second perforations. The driving unit is mounted on the die holder unit and coupled to the first ejector module and the second ejector module, and can drive the first ejector module and the second ejector module to be displaced back and forth And the first ejector rods are respectively inserted into the corresponding molds and inserted into the corresponding molds, and the second ejector rods are connected to the second ejector rods. After that, the second fixing seat is inserted out and inserted into the corresponding mold.

Thus, the bidirectional ejection mechanism of the present invention for an injection molding machine is suitable for mounting two molds which can be separately molded for plastic injection molding. The two-way ejection mechanism comprises a die base unit, an ejection unit mounted on the die base unit, and a driving unit mounted between the die holder unit and the ejection unit. The die holder unit includes a first fixing seat and a second fixing seat that cooperate with each other to define an installation space, and at least one guiding shaft extending forward and backward on the first fixing seat and the second fixing seat The first fixing seat and the second fixing seat can be respectively installed on the back side of the molds before and after the two molds are exposed, the at least one guiding shaft is exposed in the installation space, and the first fixing seat has a plurality of The first through holes are connected to the installation space, and the second fixing seat has a plurality of spaced apart distributions and extends through the second through holes communicating with the installation space. The ejector unit includes a first ejector module mounted in the installation space, and the first ejector module has a first ejector plate disposed on the at least one guiding shaft and displaced forward and backward, and a first ejector rod spaced apart from the first ejector plate, each of the first ejector rods having a rod protruding forwardly from the first ejector plate before being inserted into the first perforations And a segment extending from the first ejector plate and extending after the second perforation. The driving unit is mounted on the die holder unit and coupled to the first ejector module, and can drive the first ejector module to move forward to the first fixed seat and move backward to the second fixed seat, and The first ejector rods are inserted out of the first fixing seat and inserted into the corresponding molds, and then passed out of the second fixing seat to be inserted into the corresponding molds.

The utility model has the advantages that the structural design of the die holder unit, the ejection unit and the driving unit is adopted, so that the injection molding machine adopting the bidirectional ejection mechanism of the invention can simultaneously perform two injection molding operations and demolding operations of the finished product. It can greatly improve the production efficiency of the manufactured injection molding machine.

The invention is further described in the following examples, but it should be understood that these examples are for illustrative purposes only and are not to be construed as limiting The same number is used to indicate.

Referring to Figures 1 and 2, a first embodiment of the bidirectional ejection mechanism of the present invention for an injection molding machine is suitable for mounting on an injection molding machine (not shown) and capable of producing a first mold for different finished products. The 901 is mounted with a second mold 902 such that the injection molding machine can simultaneously perform injection molding of two finished products. The bidirectional ejection mechanism includes a mold base unit 3 for mounting the first mold 901 and the second mold 902 on the front and rear sides thereof, an ejection unit 4 mounted on the mold base unit 3, and a A drive unit 5 installed between the die holder unit 3 and the ejector unit 4. For convenience of explanation, in the following description, the left side and the right side of FIG. 5 are respectively defined as the rear side and the front side of the two-way ejection mechanism.

Referring to FIGS. 2, 3, and 4, the die holder unit 3 includes a first fixing base 31 and a second fixing base 32 which are joined forward and backward, and four upper and lower left and right spaced apart and front and rear extending and assembled to the first fixing base 31. And a guiding shaft 33 between the second fixing base 32, and the first fixing seat 31 and the engaging side of the second fixing seat 32 cooperate to define a front and rear axial cross-shaped mounting space 30, the mounting space 30 There are four groove ends 301 that communicate symmetrically with each other up and down. In the first embodiment, the die holder unit 3 is locked to the second fixing base 32 by a plurality of locking pins 34.

The first fixing base 31 can be mounted and fixed to the front side of the first mold 901, and has a cross-shaped mounting groove 311 recessed on the rear side surface thereof, and a plurality of upper and lower left and right spaced intervals and from the front side thereof The first through hole 313 extending through the mounting groove 311 is extended.

Referring to FIGS. 1 , 3 , and 4 , the second fixing base 32 is formed by sealing the rear side of the mounting slot 311 and is fixed to the rear side of the first fixing base 31 , and is defined by the first fixing base 31 . The mounting groove 311 constitutes a cross-shaped mounting space 30. The second fixing base 32 can be mounted and fixed to the rear side surface of the second mold 902, and has a plurality of second through holes 321 extending from the rear side and extending forwardly from the rear side surface thereof to communicate with the installation space 30.

The guiding shafts 33 are respectively exposed in the end portions 301 of the slots, and each of the guiding shafts 33 is respectively inserted and positioned at the front end portion and the rear end portion of the first fixing base 31 and the second fixing base. 32.

The ejector unit 4 includes a first ejector module 41 and a second ejector module which are respectively disposed in the installation space 30 and are respectively installed in the first fixing base 31 and the second fixing base 32. Group 42.

The first ejector module 41 includes a first ejector plate 411 disposed in the mounting space 30 and slidably disposed on the guiding shaft 33, and a plurality of the ejector plates 411 are fixed to the first ejector plate 411. The first ejector rods 413 are inserted into the first through holes 313 of the first through holes 313. The first ejector plate 411 has a substantially cross shape, and has four upper, lower, and left symmetrical connections and is respectively disposed in the groove end portions 301, and is sleeved on the guide shafts 33 respectively. A guiding end portion 412 can be driven to project forwardly from the front side of the first fixing seat 31 and inserted into the first mold 901 to drive the first mold 901. The finished product is demoulded.

The second ejector module 42 includes a second ejector plate 421 which is disposed on the rear side of the first ejector plate 411 and is sleeved on the guiding shaft 33, and is fixed to the second The second ejector rods 423 of the second through holes 321 are extended from the rear side of the ejector plate 421 and extend rearward. The outer shape of the second ejector plate 421 is the same as that of the first ejector plate 411, and has four guiding holes 33 respectively located in the end portions 301 of the slots and sliding forward and backward. The second guiding end portion 422 can drive the second ejector rods 423 to be displaced rearwardly and protrudes from the rear side of the second fixing base 32, and is inserted into the second mold 902 to drive the second forming member 902. The finished product of the mold 902 is demolded.

Referring to FIGS. 1 and 2, the driving unit 5 includes two first drivers 51 respectively mounted on the left and right sides of the second fixing base 32 and coupled to the first ejector plate 411, and two separate mountings. The second driver 52 is fixed to the left and right sides of the first fixing base 31 and coupled to the second ejector plate 421. In the first embodiment, the first driver 51 and the second drivers 52 are both hydraulic cylinders, but in practice, they may be pneumatic cylinders or gas/hydraulic cylinders.

The first actuators 51 are respectively coupled to two first and second opposite end portions 412 extending away from each other, each of the first actuators 51 having a first cylinder block 511 fixed to the second fixing base 32, and a The first cylinder shaft 512 can be driven to be telescopically inserted into the first cylinder block 511 and extends forwardly through the first cylinder block 511 to connect the respective first guiding end portions 412, and can be driven by The expansion and contraction of the first cylinder shaft 512 drives the first ejector plate 411 to move back and forth along the guiding shafts 33 in the installation space 30, and simultaneously drives the first ejector rods 413 to move back and forth.

The second actuators 52 are respectively coupled to the two second end portions 422 extending back and forth, and each of the second actuators 52 has a second cylinder 521 fixed to the first fixing base 31, and a The second cylinder shaft 522 can be driven to be telescopically inserted into the second cylinder 521 and extend out of the second cylinder 521 to connect the second guiding end portions 422, and can be driven by the second cylinder shaft 522 The second cylinder shaft 522 is telescoped to drive the second ejector plate 421 to be displaced back and forth along the guiding shaft 33 in the installation space 30, and the second ejector rods 423 are synchronously driven to move forward and backward.

Referring to Figures 3, 5 and 7, when the bidirectional ejection mechanism of the present invention is used, the bidirectional ejection mechanism can be driven to be mounted in a fixed mold base (not shown) and a movable mold of the injection molding machine. The first ejector rods 413 and the second ejector rods 423 are retracted into the fixing base 31 and the second fixing base 32 by the seats (not shown). The fixed mold base will mount another first mold, and the movable mold base will install another second mold, and drive the two-way ejection mechanism and the movable mold base forwardly to the fixed mold base to be installed in the two-way The first mold 901 of the ejection mechanism is engaged with the first mold mounted on the fixed mold base, and the second mold 902 mounted on the two-way ejection mechanism and the second mold mounted on the movable mold base Engage. Then, the first mold 901 and the second mold 902 joined to each other are respectively plastically injected through two injection mechanisms respectively disposed on the back side of the fixed mold base and the movable mold base. Molding action. After the plastic molding in the first mold 901 is solidified and the plastic in the second mold 902 is solidified and molded, the movable mold base and the two-way ejection mechanism can be driven to be reset to the first mold. The 901 separates and separates the second molds 902. At this time, the molded products are respectively placed on the first mold 901 and the second mold 902 mounted on the two-way ejection mechanism. Then, the two-way ejection mechanism can be driven to perform the demolding operation of the finished products.

Referring to Figures 3, 6, and 8, the two-way ejector mechanism performs the demolding operations of the finished products, and the first driver 51 and the second drivers 52 are synchronously driven to enable the first drivers 51. The first ejector plate 512 protrudes forwardly from the first ejector plate 411, and the first ejector plate 411 is advanced along the guiding shafts 33 relative to the first fixing base 31 to drive the first ejector pins. The rod 413 is forwardly protruded from the front side of the first fixing base 31 and inserted into the first mold 901 to further separate the finished product located in the first mold 901. Similarly, the second driver 52 drives the second cylinder shaft 522 to protrude rearward, and the second ejector plate 421 is driven to move backward relative to the second fixing base 32 to drive the second ejector rods 423. The backing is inserted into the second mold 902 to lift the finished product away from the second mold 902.

After driving the two-way ejection mechanism to complete the demolding operation of the finished products, the first driver 51 can be driven to retract the first cylinder shafts 512, and the second drivers 52 are driven to retract the second The cylinder shaft 522 can drive the first ejecting module 41 and the second ejecting module 42 to be displaced back and forth, so that the first ejecting rods 413 are retracted into the first fixing base 31, And moving the second ejector rods 423 forward into the second fixing base 32 to complete a one-shot injection molding operation.

Through the two-way ejection mechanism, two molds can be installed, and the structural design of the two injection molding and demolding operations can be simultaneously performed, and the output of the injection molding machine can be doubled. It should be noted that, in implementation, it is necessary to drive the first ejector module 41 and the second ejector module 42 to perform the demolding operation synchronously, and the first driver 51 and the second driver may be used. The first ejector module 41 and the second ejector module 42 are driven to operate by 52.

In the first embodiment, the two first drivers 51 are coupled to the two first and second symmetrically connected first guiding ends 412 of the first ejector plate 411, and are driven by the first drivers 51. The first ejector module 41 is displaced back and forth along the guiding shafts 33. However, in another embodiment of the present invention, the first ejector module can be driven by only one first driver 51. 41 displacement, and by the guidance of a single guiding shaft 33, the first ejecting module 41 can be stably displaced back and forth. Similarly, in another embodiment of the present invention, the displacement of the second ejector module 42 can be driven by only one second driver 52, and guided by a single guiding shaft 33, so that The second ejector module 42 can be stably displaced back and forth.

Referring to Figures 9, 10 and 11, the second embodiment of the bidirectional ejection mechanism of the present invention for an injection molding machine differs from the first embodiment in the structural design of the ejection unit 4 and the driving unit 5. For convenience of explanation, only the differences between the second embodiment and the first embodiment will be described below.

In the second embodiment, the ejector unit 4 has only one first ejector module 41, and the first ejector module 41 includes a first one that can be sleeved back and forth on the guide shafts 33. An ejector plate 411, and a plurality of first ejector rods 413 extending through the first ejector plate 411, each of the first ejector rods 413 has a protrusion from the first ejector plate 411 A front rod section 414 is inserted into each of the first perforations 313, and a rear rod section 415 is formed to project rearwardly from the first ejecting plate 411 into the respective second perforations 321 .

The driving unit 5 has only the first drivers 51 fixed to the first fixing base 31. The first driving units 51 can drive the first ejector plate 411 to be displaced forward and backward relative to the die holder unit 3, and can drive the first An ejection plate 411 is moved forwardly adjacent to the first fixing base 31, and the front rod segments 414 are inserted forwardly out of the first through holes 313 to be inserted into the first mold 901, and the first ejection plate is driven. The 411 is moved back to the second fixing base 32, and the rear rod segments 415 are inserted backwards through the second through holes 321 to be inserted into the second mold 902.

With this design, it is also possible to make the injection molding machine capable of performing bidirectional injection molding work and bidirectional release work.

Referring to Figure 12, the third embodiment of the bidirectional ejection mechanism of the present invention for an injection molding machine differs from the first embodiment in the structural design of the drive unit 5.

In the third embodiment, each of the first drivers 51 includes a first motor 513 and a first pivot socket 514 which are mounted on the first and second fixing bases 31 and 32, and a front and rear seats 514. The first transmission screw 515 is extended to the first motor 513 and is pivotally connected to the first pivoting rod 514 , and the first transmission screw 515 is screwed to the first ejector plate 411 . Each of the second actuators 52 includes a second motor 523 and a second pivoting seat 524 that are spaced apart from each other in the first and second fixing bases 31 and 32, and a front and rear extensional connection to the second motor 523. The second transmission screw 525 is pivotally disposed on the second pivoting rod 524 , and the second transmission screw 525 is screwed to the second ejector plate 421 .

With this design, each of the first motors 513 can drive the respective first driving screws 515 to rotate relative to the first pivoting seats 514 around the self-centering axis, and the first ejector plate 411 is driven to be displaced back and forth, and can be fixed. The first mold 901 of the first fixing base 31 performs a demolding operation. Each of the second motors 523 can drive the respective second driving screws 525 to rotate relative to the second pivoting seat 524 around the self-centering axis, and the second ejector plate 421 is driven to be displaced back and forth, and can be fixed to the second The second mold 902 of the holder 32 performs a demolding operation.

In the third embodiment, the first driver 51 and the second driver 52 are of the ball screw type, and the first transmission screw 515 and the second transmission screw 525 are driven to rotate. An ejector plate 411 and the second ejector plate 421 are displaced back and forth. However, in another embodiment of the present invention, the first driver 51 and the second driver 52 may also be designed as a hollow motor structure. At this time, the first motor 513 is a hollow motor, and each of the first A first pivoting socket is not disposed on a driver 51. The first driving screw 515 is screwed to the first motor 513 and fixed to the first ejector plate 411. The first motor 513 can drive the first driving screw. The 515 is displaced forward and backward, and the first ejector plate 411 is synchronously driven to move forward and backward. Similarly, each second driver 52 is not provided with the second pivoting seat, the second driving screw 525 is fixed to the second ejector plate 421, and the second motor 523 is a hollow motor capable of transmitting the second transmission. The screw 525 is displaced back and forth, and the second ejector plate 421 is synchronously driven to be displaced.

In summary, through the structural design of the die holder unit 3, the ejection unit 4 and the driving unit 5, the bidirectional ejection mechanism of the present invention can be used to mount two molds, so that the injection of the two-way ejection mechanism of the present invention is adopted. The molding machine can perform two injection molding operations and demolding operations at the same time, which can greatly improve the production efficiency of the injection molding machine, and is a very innovative design. Therefore, the object of the present invention can be achieved.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the simple equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still Within the scope of the invention patent.

3‧‧‧Mold base unit

30‧‧‧Installation space

301‧‧‧ slot end

31‧‧‧First mount

311‧‧‧Installation slot

313‧‧‧First perforation

32‧‧‧Second fixed seat

321‧‧‧Second perforation

33‧‧‧Guidance axis

34‧‧‧Lock nail

4‧‧‧Ejecting unit

41‧‧‧First ejection module

411‧‧‧First top board

412‧‧‧First leading end

413‧‧‧First launching rod

414‧‧‧ front pole

415‧‧‧ rear section

42‧‧‧Second ejection module

421‧‧‧Second ejection board

422‧‧‧Second guiding end

423‧‧‧Second ejector

5‧‧‧ drive unit

51‧‧‧First drive

511‧‧‧First cylinder

512‧‧‧First cylinder shaft

513‧‧‧First motor

514‧‧‧First pivoting seat

515‧‧‧First drive screw

52‧‧‧second drive

521‧‧‧Second cylinder

522‧‧‧Second cylinder shaft

523‧‧‧second motor

524‧‧‧Second pivoting seat

525‧‧‧second drive screw

901‧‧‧First mould

902‧‧‧Second mold

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: Figure 1 is a first embodiment of the bidirectional ejection mechanism for an injection molding machine of the present invention with a first mold Figure 2 is a perspective view of the first embodiment of the first embodiment; Figure 3 is an exploded perspective view of the first embodiment; Figure 4 is a cross-sectional view of Figure 1 along line AA; Figure 5 Is a side view of the first embodiment; FIG. 6 is a view similar to FIG. 5, and illustrates that a plurality of first ejector rods are inserted through a first fixing seat and inserted into a first mold, and a plurality of second ejector rods Figure 7 is a side cross-sectional view of the first embodiment; Figure 8 is a side view similar to Figure 7 and illustrating a plurality of first ejecting rods penetrating the second mold a first fixing seat is inserted into the first mold, and a plurality of second ejector rods are inserted out of the second fixing seat to insert the second mold; FIG. 9 is a bidirectional ejection mechanism for the injection molding machine of the present invention; An exploded perspective view of a second implementation; Figure 10 is the A side view of the second embodiment illustrates the case where the first ejector rods of the first ejector module are driven to project rearwardly from the second fixing seat and are inserted into the second mold; FIG. 11 is a side view of the second embodiment, illustrating the case where the first ejector rods of the first ejector module are driven to protrude forwardly from the first fixing seat and inserted into the first mold; and FIG. 12 It is a perspective view of a third embodiment of the two-way ejection mechanism of the present invention for an injection molding machine.

Claims (17)

A bidirectional ejection mechanism for an injection molding machine, which is suitable for installing two molds respectively capable of being molded by plastic injection molding, and comprising: a mold base unit including front and rear joints to define an installation space a first fixing seat and a second fixing seat, and at least one guiding shaft extending forward and backward on the first fixing seat and the second fixing seat, the first fixing seat and the second fixing seat can provide the same The molds are respectively mounted on the front and back sides of the two, the at least one guiding shaft is exposed in the installation space, and the first fixing seat has a plurality of spaced apart distributions and extends through the first through holes communicating with the installation space. The second fixing seat has a plurality of spaced apart distributions and extends through the second through holes communicating with the installation space; an ejector unit comprising a first one that is displaceably disposed back to the at least one guiding axis and located in the installation space An ejecting module and a second ejecting module, the first ejecting module having a plurality of first ejecting rods respectively extending forwardly inserted into the first perforations, the second ejecting module having a second ejector rod that is inserted into the second perforations, and a driving unit that is mounted on the mold base unit and coupled to the first ejecting module and the second ejecting module. The first ejector module and the second ejector module can be driven to be displaced back and forth to be adjacent to the first fixing seat and the second fixing seat respectively, and the first ejector rods are forwarded to the front. The first fixing seat is inserted into the corresponding mold, and the second ejector rods are interlocked to pass through the second fixing seat and inserted into the corresponding mold. The bidirectional ejection mechanism for an injection molding machine according to claim 1, wherein the installation space is a cross shape of the front and rear axial directions, and has four symmetrically communicating groove ends, and the die base unit includes four a first guiding shaft further extending from the leading end of the groove, the first ejector module further having a first ejector plate having a cross shape and being mounted by the first ejector rods, the first The ejector plate has four symmetrical connection portions respectively disposed in the end portions of the slots, and is sleeved on the first guiding end portions of the guiding shafts, and the second ejector module is An interval is disposed on the rear side of the first ejector module, and further has a second ejector plate that is substantially cross-shaped and is mounted by the second ejector rods. The second ejector plate has four symmetrically connected They are respectively disposed in the end portions of the slots, and are respectively sleeved on the second guiding end portions of the guiding shafts. The bidirectional ejection mechanism for an injection molding machine according to claim 2, wherein the driving unit comprises at least one first guiding end coupled to the first ejector plate and capable of driving the first top a first driver that is displaced back and forth along the guiding shafts, and at least one second driver that is coupled to one of the second guiding ends of the second ejector plate and capable of driving the second ejector plate to be displaced back and forth . The two-way ejection mechanism for the injection molding machine of claim 3, wherein the driving unit comprises two first drivers spaced apart from the second fixing base and coupled to the first ejector plate, and two a second driver that is spaced apart from the first mounting seat and coupled to the second ejector plate. The first drivers are respectively coupled to two of the first guiding ends extending oppositely, and the second The drivers are respectively coupled to two of the second guiding ends extending oppositely. The two-way ejecting mechanism for the injection molding machine of claim 4, wherein the first fixing seat faces the second fixing seat, and a side recessed for the first ejecting plate and the second ejecting The plate can be inserted into the limit type of the cross-shaped mounting groove, and the second fixing seat is coupled to the rear side of the first fixing seat to cover the mounting groove, and is matched with the first fixing seat. The installation space constituted by the installation groove is provided. The two-way ejecting mechanism for the injection molding machine of claim 1, wherein the driving unit comprises a first mounting base and a second fixing base, respectively, and is respectively coupled to the first ejecting module. And the at least one first driver and the at least one second driver respectively driving the first ejector module and the second ejector The module is displaced back and forth along the at least one guiding axis. The two-way ejecting mechanism for the injection molding machine of claim 6, wherein the driving unit comprises a plurality of first drivers spaced apart from the second fixing base and coupled to the first ejecting module, and a plurality of spacers are mounted on the first mounting base and coupled to the second driver of the second ejecting module. The bidirectional ejection mechanism for an injection molding machine according to claim 4, wherein each of the first actuators includes a first cylinder fixed to the second fixing base, and a front and rear telescopically insertable Extending the first cylinder to the first cylinder shaft of the first ejector plate, and each of the second actuators includes a second cylinder fixed to the first fixing seat And a second cylinder shaft that is inserted into the second cylinder body and extends rearwardly and outwardly from the second cylinder to be coupled to the second ejector plate. The bidirectional ejection mechanism for an injection molding machine according to claim 4, wherein each of the first drivers includes a first motor that is respectively mounted to the first and second fixing seats at intervals in front and rear. And a first pivoting socket, and a first driving screw coupled to the first motor and pivotally positioned on the first pivoting socket and threaded through the first ejector plate, each second The driving device includes a second motor and a second pivoting seat respectively mounted on the second fixing seat and the first fixing seat, and a front and rear extending connection to the second motor and pivotally positioned on the second a pivoting seat and a second transmission screw screwed to the first ejector plate, the first motor can drive the first transmission screw to rotate around the axis of the body to drive the first ejector plate to move forward and backward, the first The two motors can drive the second transmission screw to rotate around the axis of the body to drive the second ejector plate to move forward and backward. The two-way ejecting mechanism for an injection molding machine according to claim 4, wherein each of the first drivers includes a first motor mounted to the second mount, and a threaded plug that can be displaced forward and backward The first motor is pivotally connected to the first driving screw of the first ejector plate, and each of the second driving devices includes a second motor mounted on the first fixing seat, and a front and rear displacement screwing The second motor is pivotally connected to the second transmission screw of the second ejector plate, and the first motor can drive the first transmission screw to rotate forward and backward to drive the first ejector plate to move forward and backward. The second motor can drive the second transmission screw to rotate forward and backward to drive the second ejector plate to move forward and backward. A bidirectional ejection mechanism for an injection molding machine, which is suitable for installing two molds respectively capable of being molded by plastic injection molding, and comprising: a mold base unit including front and rear joints to define an installation space a first fixing seat and a second fixing seat, and at least one guiding shaft extending forward and backward on the first fixing seat and the second fixing seat, the first fixing seat and the second fixing seat can provide the same The molds are respectively mounted on the front and back sides of the two, the at least one guiding shaft is exposed in the installation space, and the first fixing seat has a plurality of spaced apart distributions and extends through the first through holes communicating with the installation space. The second fixing base has a plurality of spaced apart and extending through the second through hole communicating with the installation space; an ejector unit comprising a first ejector module installed in the installation space, the first ejector module a first ejector plate disposed on the at least one guiding shaft and configured to be displaced back and forth, and a plurality of first ejector pins spaced apart from the first ejector plate, the first ejector rods Having a rod segment protruding forward from the first ejector plate and respectively inserted before the first perforations, and a protrusion protruding from the first ejector plate and respectively inserted into the second ejector a hole segment after the perforation; and a driving unit mounted on the die holder unit and coupled to the first ejecting module, capable of driving the first ejecting module to move forward to the first fixing seat and to move backward to the first And the first ejector rods are inserted into the corresponding molds and inserted into the corresponding molds, and then inserted into the corresponding molds. The two-way ejection mechanism for an injection molding machine according to claim 11, wherein the installation space is a cross shape of the front and rear axial directions, and has four symmetrically communicating groove ends, and the die base unit includes four a guiding shaft that is respectively exposed to the end of the groove, and the first ejector plate has four symmetrically connected portions respectively disposed in the end portions of the grooves, and can be respectively sleeved on the front and rear sliding plates. The first guiding end of the guiding shaft. The bidirectional ejection mechanism for an injection molding machine according to claim 12, wherein the driving unit comprises at least one first guiding end coupled to the first ejector plate and capable of driving the first a first driver that ejector plates are displaced back and forth along the guiding axes. The two-way ejecting mechanism for the injection molding machine of claim 13, wherein the driving unit comprises two first drivers coupled to the first ejecting plate, the first drivers being respectively coupled to each other Two of the first leading ends are extended. The two-way ejecting mechanism for an injection molding machine according to claim 14, wherein each of the first drivers includes a first cylinder fixed to one of the second fixing base and the second fixing base, and A first cylinder shaft that can be driven to be telescopically inserted into the first cylinder body and extends forward and backward to protrude outside the first cylinder to be coupled to the first ejector plate. The two-way ejection mechanism for an injection molding machine according to claim 14, wherein each of the first drivers includes a first motor and a first motor mounted to the first and second fixing seats at intervals a first pivoting seat, and a first driving screw coupled to the first motor and pivotally positioned on the first pivoting seat and threaded through the first ejector plate, the first motor can be driven The first transmission screw rotates around the body axis to drive the first ejector plate to move back and forth. The two-way ejection mechanism for an injection molding machine according to claim 14, wherein each of the first drivers includes a first motor mounted to one of the first mount and the second mount, and a first motor The first driving screw can be pivotally connected to the first motor and pivotally positioned on the first ejector plate, and the first motor can drive the first transmission screw to rotate forward and backward to drive the first The ejector plate is displaced before and after.