Search

CN-122008488-A - Multistage nested positioning guide mechanism of injection mold

CN122008488ACN 122008488 ACN122008488 ACN 122008488ACN-122008488-A

Abstract

The invention belongs to the technical field of injection molds, in particular to a multistage nested positioning guide mechanism of an injection mold, which comprises a main plate, a movable mold, a fixed mold, a plurality of guide rods arranged between the main plate and the fixed mold, a first driving structure arranged on the main plate and used for driving the movable mold to move, and a positioning structure, wherein the positioning structure comprises a first positioning rod fixedly arranged on the fixed mold, a first positioning hole formed in the movable mold, a second positioning hole formed in the first positioning rod, a second positioning rod slidingly assembled on the movable mold, an adjustable buffer unit accommodated in the first positioning hole, a second driving structure arranged on the guide rods and respectively connected with the adjustable buffer unit and the second positioning rod in a driving mode, and a transmission structure arranged on the main plate, and the positioning structure is used for realizing the axial and radial step positioning of the movable mold and the fixed mold, eliminating a gap between the movable mold and the fixed mold, greatly improving the glue overflow preventing effect and improving the molding yield of injection products.

Inventors

  • LIU GUOGUANG
  • FU YONGGUI
  • LUO WEI
  • LI AO

Assignees

  • 长沙国光模具有限公司

Dates

Publication Date
20260512
Application Date
20260413

Claims (10)

  1. 1. The multistage nested positioning and guiding mechanism of the injection mold comprises a main plate (1), a movable mold (2) and a fixed mold (3), wherein a plurality of guide rods (4) are arranged between the main plate (1) and the fixed mold (3), the movable mold (2) is in sliding fit with the guide rods (4), and a first driving structure (5) for driving the movable mold (2) to move is arranged on the main plate (1), and is characterized by further comprising: -a positioning structure (6), the positioning structure (6) comprising: the first positioning rod (61) is fixedly arranged on the fixed die (3); a first positioning hole (62) formed in the movable die (2); a second positioning hole (63) formed in the first positioning rod (61); A second positioning rod (64) slidingly assembled on the movable die (2); An adjustable buffer unit (65) accommodated inside the first positioning hole (62); the second driving structure (7) is arranged on the guide rod (4) and is respectively in driving connection with the adjustable buffer unit (65) and the second positioning rod (64); The transmission structure (8) is arranged on the main board (1) and is used for transmitting matching power to the second driving structure (7) according to the real-time moving speed of the movable die (2) during die assembly, and the second driving structure (7) is used for adjusting the buffering performance of the adjustable buffering unit (65); When the movable die (2) stops moving, the second driving structure (7) drives the second positioning rod (64) to be inserted into the second positioning hole (63).
  2. 2. The multi-stage nested positioning and guiding mechanism for an injection mold according to claim 1, wherein the first driving structure (5) comprises: A screw rod (51) with one end fixed on the movable mould (2); and a nut (52) assembled on the main plate (1) in a rotating way, and the screw rod (51) and the nut (52) are matched to form a screw rod pair.
  3. 3. The multi-stage nested positioning and guiding mechanism for an injection mold according to claim 2, wherein the adjustable buffer unit (65) comprises: the circular tube (651) is rotationally assembled in the first positioning hole (62), and the circular tube (651) is used for containing buffer solution; A push plate (652) slidably fitted in the first positioning hole (62), one end of the push plate (652) being fitted in the round tube (651), and the end being fitted with a first circular plate (653); A second circular plate (654) slidingly assembled in the circular tube (651), wherein the second circular plate (654) and the first circular plate (653) are rotatably assembled, and the two circular plates divide the interior of the circular tube (651) into two cavities; A first hole (656) and a second hole (657) respectively arranged on the second circular plate (654) and the first circular plate (653), wherein the first hole (656) and the second hole (657) are used for buffer to flow between two cavities, and the larger the intersection range of the first hole (656) and the second hole is, the smoother the buffer to flow is, and the smaller the buffer effect on the first positioning rod (61) is; And a first spring (658) installed between the second circular plate (654) and the circular tube (651).
  4. 4. The multi-stage nested positioning guide mechanism for an injection mold according to claim 3, wherein said second driving structure (7) comprises: A first gear (71) rotatably mounted on the outside of the round tube (651); The second gear (72) is assembled on the guide rod (4), the second gear (72) is in meshed connection with the first gear (71), and the guide rod (4) is in rotary connection with the fixed die (3) and the main board (1); And the first circular ring (73) is rotationally assembled on the movable die (2), and the first circular ring (73) is slidingly assembled with the guide rod (4).
  5. 5. The multi-stage nested positioning and guiding mechanism for an injection mold according to claim 4, wherein said second driving structure (7) comprises: a second circular ring (74) rotationally assembled on the movable die (2), wherein the second circular ring (74) is in threaded assembly with the second positioning rod (64); A ratchet wheel (75) sleeved outside the second circular ring (74); A telescopic plate (76) assembled on the movable die (2); The first rack plate (77) and the second rack plate (78) are fixedly arranged on the movable part of the expansion plate (76), the first rack plate (77) is connected with the second gear (72) in a meshed mode, and the second rack plate (78) is connected with the ratchet wheel (75) in a meshed mode.
  6. 6. The multi-stage nested positioning and guiding mechanism for an injection mold according to claim 5, wherein said second driving structure (7) further comprises: A mounting shell (79) fixedly arranged on the movable mould (2), -said second positioning rod (64) is slidingly fitted with said mounting shell (79); a first torsion spring (710) mounted between the ratchet (75) and the mounting housing (79); A connection block (711) slidingly mounted on the movable die (2), the connection block (711) being rotatably mounted with a pawl (713) for restricting unidirectional rotation of the ratchet (75); And the push rod (712) is used for pushing the connecting block (711) to slide, and the push rod (712) is slidably assembled on the movable part of the telescopic plate (76).
  7. 7. The multi-stage nested positioning and guiding mechanism for an injection mold according to claim 2, wherein the transmission structure (8) comprises: A third gear (81) for driving the guide rod (4) to rotate, wherein the third gear (81) is rotationally assembled with the main board (1); A fourth gear (82) for driving the third gear (81) to rotate, wherein the fourth gear (82) is rotatably assembled on the main board (1); an arc plate (83) slidably mounted on the main plate (1); The two ends of the connecting rod (84) are respectively in rotary connection with the arc-shaped plate (83) and the fourth gear (82); and a third circular plate (85) assembled on the first driving structure (5) is rotated, a plurality of telescopic rods (86) assembled on the third circular plate (85) are arranged, and the end parts of the telescopic rods (86) are abutted to one side of the arc-shaped plate (83).
  8. 8. The multi-stage nested positioning and guiding mechanism for an injection mold according to claim 7, wherein said first driving structure (5) further comprises: An inner gear ring (53) rotationally assembled on the main board (1), wherein the inner gear ring (53) is fixedly assembled with the nut (52); a sun gear (54) rotatably assembled on the main plate (1), and the circular plate is connected with the sun gear (54); A planet carrier (55) rotatably assembled on the main board (1), wherein a plurality of planet gears (511) are rotatably arranged on the planet carrier (55), and the planet gears (511) are simultaneously meshed with the sun gear (54) and the inner gear ring (53); Wherein, ring gear (53), sun gear (54) and planet wheel (511) cooperate together and form planetary gear mechanism.
  9. 9. The multi-stage nested positioning and guiding mechanism for an injection mold according to claim 8, wherein said first driving structure (5) further comprises: A pinion (56) sleeved on the periphery of the third circular plate (85); An electromagnet (57) fixed on the sun gear (54); a magnetic ring (58) fitted on the pinion (56); A main gear (59) for driving the auxiliary gear (56) to rotate, wherein a chain for transmission is arranged between the main gear (59) and the auxiliary gear (56); A switch (510) mounted on the second drive structure (7), the switch (510) being located within the range of movement of the second positioning rod (64); When the second positioning rod (64) is in contact with the switch (510), namely after the second positioning rod (64) is moved out of the second positioning hole (63), the electromagnet (57) is electrified, so that the pinion (56) drives the sun gear (54) to synchronously rotate through the electromagnet (57) and the magnetic ring (58).
  10. 10. The multistage nested positioning and guiding mechanism for an injection mold according to claim 7, wherein one end of the telescopic rod (86) abutted with the arc-shaped plate (83) is sleeved with a ball in a nested manner.

Description

Multistage nested positioning guide mechanism of injection mold Technical Field The invention belongs to the field of injection molds, and particularly relates to a multistage nested positioning guide mechanism of an injection mold. Background The injection molding is the most widely applied molding process in the plastic processing field, the injection mold is core equipment of the process, the precision of the injection mold directly determines the dimensional precision, the appearance quality and the molding stability of plastic products, wherein the positioning guide mechanism is used as a key component part of the injection mold, and mainly bears the accurate alignment of a movable mold and a fixed mold and the movement guide of an opening mold and a closing mold, thereby being a foundation for guaranteeing the normal work of the mold. One patent application with the publication number of CN117301449A discloses a guiding device and a guiding method for an injection mold adopting a rotary guiding structure, and the guiding device comprises a lower module, an injection pipe, an upper template and two strip grooves, and further comprises a rotating device, wherein the rotating device is arranged in the middle of the bottom surface of the upper template and comprises a square casing, four motors, four swivel rings, four concave rings and four threaded rods, the square casing is fixed in the middle of the bottom surface of the upper template, the square casing is arranged on the front surface of the upper template, the four motors are fixedly arranged on the back surface inside the square casing, the four swivel rings are respectively fixed on the back surface of a rotating shaft of the four motors, and the upper template and the lower module are closed more tightly under the action of rotation guiding of the threaded rods and threaded holes so as to avoid glue overflow caused by gaps when the guiding device for the injection mold is used. The scheme can only realize the guiding effect of template movement, has no technical means of die locking and positioning, can not fundamentally eliminate die locking gaps, has poorer expected glue overflow prevention effect, and meanwhile, the vibration reduction and impact prevention design is realized only through a spring with fixed elastic force, lacks self-adaptive buffer adjustment capability, can not match vibration reduction force according to the real-time movement speed of a movable die during die locking, is difficult to effectively counteract die locking impact and vibration when the movable die moves at a higher speed, is easy to cause hard collision of the template, can intensify the fit gap between a threaded rod and a threaded hole, further amplifies positioning deviation, enlarges the die locking gaps, reversely aggravates the glue overflow problem, and can also cause impact abrasion of die parts. Therefore, the invention provides a multistage nested positioning guide mechanism of an injection mold. Disclosure of Invention In order to overcome the deficiencies of the prior art, at least one technical problem presented in the background art is solved. The technical scheme includes that the multistage nested positioning guide mechanism of the injection mold comprises a main plate, a movable mold and a fixed mold, wherein a plurality of guide rods are arranged between the main plate and the fixed mold, the movable mold is in sliding fit with the guide rods, a first driving structure for driving the movable mold to move is arranged on the main plate, and the multistage nested positioning guide mechanism also comprises a positioning structure, a first positioning hole, a second positioning hole and a second positioning rod, wherein the first positioning rod is fixedly arranged on the fixed mold; The adjustable buffer unit is accommodated in the first positioning hole, the second driving structure is arranged on the guide rod and is respectively in driving connection with the adjustable buffer unit and the second positioning rod, the transmission structure is arranged on the main board and is used for transmitting matching power to the second driving structure according to the real-time moving speed of the movable die during die assembly, and the second driving structure is used for adjusting the buffer performance of the adjustable buffer unit, wherein the second driving structure drives the second positioning rod to be inserted into the second positioning hole when the movable die displacement stops. Preferably, the first driving structure comprises a screw rod with one end fixedly arranged on the movable die and a nut rotationally assembled on the main plate, wherein the screw rod and the nut are matched to form a screw rod pair. The adjustable buffer unit comprises a round tube rotationally assembled in the first positioning hole, a push plate slidingly assembled in the first positioning hole, a first round plate assembled at one end of the push plate in