CN202727281U - Pull rod structure of injection molding machine - Google Patents
Pull rod structure of injection molding machine Download PDFInfo
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- CN202727281U CN202727281U CN 201220364930 CN201220364930U CN202727281U CN 202727281 U CN202727281 U CN 202727281U CN 201220364930 CN201220364930 CN 201220364930 CN 201220364930 U CN201220364930 U CN 201220364930U CN 202727281 U CN202727281 U CN 202727281U
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- thread segment
- pull rod
- pull bar
- mode transfer
- rod structure
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Abstract
The utility model relates to a pull rod structure of an injection molding machine of the field of the injection molding machine, which is improved and designed aiming at the fact that the current pull rod of the injection molding machine is fractured to be failed. The pull rod structure comprises a pull rod and a pull rod die-height adjustment nut, wherein the pull rod comprises a die-height adjustment thread segment, and a tooth body with a large thread pitch is formed on the die-height adjustment thread segment; the pull rod die-height adjustment nut is in thread fit with the die-height adjustment thread segment through the tooth body with the large thread pitch; and a large rounded corner is used for transition at a step or a relief groove. The pull rod structure is characterized in that the thread tooth body of the die-height adjustment thread segment is a sawtooth with the large thread pitch, and the outer diameter of the die-height adjustment thread segment body is slightly larger than the outer diameter of a stress groove; the die-height adjustment thread segment body is cylindrical, and the outer surface of the pull rod die-height adjustment nut is matched with an outer ring; and the outer ring tightly holds the pull rod die-height adjustment nut. Through the improved structure, the purposes that a clamping mechanism is reliably operated and the service life of the pull rod is prolonged are achieved. The pull rod structure has the advantages of simple structure and convenience in processing, and the technical content of the injection molding machine is increased.
Description
Technical field
The utility model relates to injection molding machine mold clamping mechanism rod assembly technical field, relates in particular to a kind of injection machine draw rod structure.
Background technology
Pull bar is the high rigidity elastic part that Clamping Device of Injection Moulding Machine produces mold clamping force, is directly connected to reliability service and the service life of clamping.Its mode transfer screw thread of pull bar of existing clamping is generally common coarse thread, under injection machine foot load, high-tensile strength, long-time, high-frequency operating position, because common coarse thread fatigue resistance is poor, very easily ruptures at the screw thread place.
Existing a kind of combination drive type mould clamping mechanism of all-electric injection molding machine comprises adjustment nut; gripper shoe; pull bar; elbow-bar mechanism; moving platen; mould; fixed form; the screw thread crosshead; pull bar can be a plurality of; distribution is centrosymmetric; gripper shoe is installed on the pull bar; adjustment nut is regulated the position of gripper shoe on pull bar according to the thickness of mould; pull bar is fixed on the fixed form; moving platen is sheathed on the pull bar; elbow-bar mechanism drives moving platen and moves back and forth; be symmetrically installed with threaded screw rod on the gripper shoe; gripper shoe adopts with threaded screw rod and is threaded; servomotor is connected with threaded screw rod one end by outer Timing Belt; the threaded screw rod other end is fixedly connected with the hinge cover; hinge puts a fulcrum that connects elbow-bar mechanism; the screw thread crosshead is installed in the middle of the gripper shoe; gripper shoe and screw thread crosshead are for being threaded; conventional motor is connected with the first end of screw thread cross by the inter-sync band; the other end of this screw thread crosshead connects a fulcrum of elbow-bar mechanism; servomotor; conventional motor is worked simultaneously; the rotation of servomotor converts the rectilinear motion of hinge cover to by threaded screw rod; the rotation of conventional motor converts the rectilinear motion at an angle to by the screw thread crosshead, two kinds of rectilinear motions drive the moving platen motion by elbow-bar mechanism and realize opening or closing of mould.But the pull bar of this injection machine hybrid-driven clamping easily causes thread abrasion, fracture.
The analysis of causes of injection machine pull bar fracture, the one, fatigue rupture, the course of work of injection machine is the process of alternate stress, therefore any stress concentrated area factor that causes all may cause fatigue rupture, as: the larger step place of week footpath variation; Filtration place lacks fillet escape etc.; Injurious surface mark or screw thread destroyed the optical axis surface because of carelessness; The improper stress that causes of thread surface heat treatment is concentrated; Material is defective but.The 2nd. overload is broken, and leans on four pull bar distortion to obtain clamp force because axle is pull-type, if four pull bar length are different, then its distortion is just different, as in four one shorter, then shorter pull bar difficulty can be born and be substantially exceeded 1/4 clamp force that itself should bear, thereby causes breaking.The 3rd, temperature strain causes breaking, if four pull bars are different in size, for example: one long, article three, short, so than long draw because rapid temperature is high or reduce caused thermal stress, be subject to the constraint of other three bars, be in the static indeterminacy state, will cause this pull bar fracture.The 4th, what composite strain caused breaks, if mould is uneven, the length of pull bar (hinge limit). the composition error of the height of bearing block and the parts such as length of pull bar is too large, when pull bar stretches, the both sides unbalance stress, will cause so rear pattern plate to swing, pull bar is subjected to curved, and pull bar is under the effect of bending stress and tensile stress, pull bar is easily broken, cause the product overlap, the operator who generally lacks experience can further strengthen clamp force, thereby causes pullup acceleration to break and the distortion of mould overload.The 5th, the destruction that temporary impact stress causes is owing to toggle rod type clamp force before die sinking could discharge, therefore the temporary impact of die sinking causes machine vibration and causes pull bar and other damage parts; Because whole matched moulds parts (comprising mould) remain under the stress state for a long time, can cause the part premature fatigue to lose efficacy.
Summary of the invention
Technical problem to be solved in the utility model is for the above-mentioned state of the art, and long injection machine draw rod structure of a kind of simple in structure, firm, life-span is provided.By the zigzag Tiebar structure technology of the coarse pitch that provides, make it solve the defect problems such as pull bar easily ruptures at the end of thread, the life-span is short.
The utility model solves the problems of the technologies described above the technical scheme that adopts:
A kind of injection machine draw rod structure comprises pull bar and pull bar adjustment nut, and pull bar includes the mode transfer thread segment, wherein, be formed with coarse pitch tooth body on the mode transfer thread segment, the pull bar adjustment nut is by coarse pitch tooth body and mode transfer thread segment threaded engagement, at step or escape place, with large round-corner transition.
For optimizing technique scheme, the concrete measure of taking also comprises:
The pitch of coarse pitch tooth body is 6mm.
Coarse pitch tooth body is ball ridge body or trapezoidal-thread body; The pitch of described coarse pitch tooth body is determined according to the diameter of described pull bar, the diameter 45mm to 70mm that difference is corresponding, and pitch is 6mm; Or diameter 75mm to 140mm, pitch is 8mm; Or diameter 145mm to 180mm, pitch is 12mm.
The pull bar adjustment nut is clasp nut.
Pull bar includes pull bar smooth section, stress groove, mode transfer thread segment head end.
Stress groove external diameter is less than mode transfer thread segment external diameter.
Stress groove external diameter is 0.6 times to 0.8 times of mode transfer thread segment external diameter.
Mode transfer thread segment head end is cone shape.
Match by C angle or R angle between mode transfer thread segment head end and the mode transfer thread segment.
Pull bar adjustment nut outer peripheral face is held tightly and is combined with the outer ring.
Compared with prior art, a kind of injection machine draw rod structure of the present utility model, comprise pull bar and pull bar adjustment nut, pull bar includes the mode transfer thread segment, wherein, be formed with coarse pitch tooth body on the mode transfer thread segment, the pull bar adjustment nut is by coarse pitch tooth body and mode transfer thread segment threaded engagement, at step or escape place, with large round-corner transition.After adopting said structure, mode transfer thread segment pitch of the present utility model increases, several leading the stressed minimizing of tooth body, and screw thread is stressed evenly, thus the stress that is subject on the pull rod screw is more even, and stress is well below fatigue limit.
As a kind of preferred structure of the present utility model, this pitch is 6mm.Adopt such structure, can greatly improve the stress structure of mode transfer thread segment, make stress more even, no longer become the part occurred frequently that cracks, ruptures, prolonged the service life of pull bar and matched moulds.
As further preferred structure of the present utility model, the ridge body between adjustment nut and the described mode transfer thread segment is ball ridge body or trapezoidal-thread body, and is wider, more solid than common coarse thread, reduces the screw thread fracture.
As further preferred structure of the present utility model, this pull bar adjustment nut adopts clasp nut.Adopt this structure, can make nut structure simple, be convenient to repair and replacement.
According to the operating position of reality, bigger at specific stress groove external diameter to the external diameter general control of mode transfer thread segment body, and also mode transfer thread segment head end is cone shape, mode transfer thread segment body is cylindrical shape.Can guarantee like this stress is decomposed gradually by the stress groove, make thread segment stressed evenly, prolong body service life.
In above-mentioned various structures, the adjustment nut outside so that adjustment nut is not easy damage, and is strengthened screwing of adjustment nut and mode transfer thread segment by the outer ring being installed so that can hold adjustment nut tightly.
The utlity model has simple in structure, volume is less, compact conformation, can extending pull rod service life, the advantage of saving production cost.
Description of drawings
Fig. 1 is the utility model structural representation.
The specific embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.
The sequence number of above accompanying drawing and name are called: pull bar 1, pull bar smooth section 1a, stress groove 1b, mode transfer thread segment 1c, coarse pitch tooth body 1d, mode transfer thread segment head end 1e, pull bar adjustment nut 2, outer ring 3.
As shown in Figure 1, a kind of injection machine draw rod structure of the present utility model, comprise pull bar 1 and pull bar adjustment nut 2, described pull bar 1 includes mode transfer thread segment 1c, wherein, be formed with coarse pitch tooth body 1d on the described mode transfer thread segment 1c, described pull bar adjustment nut 2 is by coarse pitch tooth body 1d and described mode transfer thread segment 1c threaded engagement, at step or escape place, with large round-corner transition.
Among the embodiment, the pitch of coarse pitch tooth body 1d is 6mm.
Among the embodiment, coarse pitch tooth body 1d is ball ridge body or trapezoidal-thread body.
Among the embodiment, pull bar adjustment nut 2 is clasp nut.
Among the embodiment, pull bar 1 includes pull bar smooth section 1a, stress groove 1b, mode transfer thread segment head end 1e.
Among the embodiment, stress groove 1b external diameter is less than mode transfer thread segment 1c external diameter.
Among the embodiment, stress groove 1b external diameter is 0.6 times to 0.8 times of mode transfer thread segment 1c external diameter.
Among the embodiment, mode transfer thread segment head end 1e is cone shape.
Among the embodiment, match by C angle or R angle between mode transfer thread segment head end 1e and the described mode transfer thread segment 1c.
Among the embodiment, pull bar adjustment nut 2 outer peripheral faces are held tightly and are combined with outer ring 3.
After adopting said structure, mode transfer thread segment 1c pitch of the present utility model increases, several leading the stressed minimizing of tooth body, and screw thread is stressed evenly, thus the stress that is subject on the pull rod screw is more even, and stress is well below fatigue limit.
As a kind of preferred structure of the present utility model, this pitch is 6mm.Adopt such structure, can greatly improve the stress structure of mode transfer thread segment 1c, make stress more even, no longer become the part occurred frequently that cracks, ruptures, prolonged the service life of pull bar and matched moulds.
As another preferred structure of the present utility model, the ridge body between adjustment nut 2 and the mode transfer thread segment 1c is ball ridge body or trapezoidal-thread body, and is wider, more solid than common coarse thread, reduces the screw thread fracture.The pitch of coarse pitch tooth body 1d is determined according to the diameter of described pull bar 1, the diameter 45mm to 70mm that difference is corresponding, and pitch is 6mm; Or diameter 75mm to 140mm, pitch is 8mm; Or diameter 145mm to 180mm, pitch is 12mm.As further preferred structure of the present utility model, this pull bar adjustment nut 2 adopts clasp nut.Adopt this structure, can make nut structure simple, be convenient to repair and replacement.
According to the operating position of reality, bigger at specific stress groove external diameter to the external diameter general control of mode transfer thread segment 1c body, and also mode transfer thread segment 1c head end is cone shape, mode transfer thread segment 1c body is cylindrical shape.Can guarantee like this stress is decomposed gradually by the stress groove, make thread segment stressed evenly, prolong body service life.
In above-mentioned various structures, the adjustment nut outside so that adjustment nut is not easy damage, and is strengthened screwing of adjustment nut and mode transfer thread segment 1c by outer ring 3 being installed so that can hold adjustment nut tightly.
Above-mentioned design, the one, avoid because the diameter of axle sharply changes, at step or escape place, as far as possible with large round-corner transition, select combination property than good material, special processing should solve thread surface hardness (wear-resisting) and manage again to build surface stress and concentrate, and improve surface smoothness, reduces stress rupture as far as possible.The 2nd, guarantee the length of machining accuracy, particularly connecting rod, the height of bearing block, the precision of crosshead, bearing block is in positioning accuracy of template etc.The 3rd, pay special attention in when assembling or after tearing adjustment nut open, must the length of four pull bars is better, the spacing of its adjustment nut and template also will be adjusted.The 4th, when the production overlap, to analyze its reason, do not want unilateral raising clamp force, should polish as finding the mould injustice, all should calibration such as length of connecting rod, comprise the pad copper sheet, the scraps of paper etc. are perhaps proofreaied and correct adjustment nut.
The utlity model has simple in structure, volume is less, compact conformation, can extending pull rod service life, the advantage of saving production cost.
Claims (10)
1. injection machine draw rod structure, comprise pull bar (1) and pull bar adjustment nut (2), described pull bar (1) includes mode transfer thread segment (1c), it is characterized in that: be formed with coarse pitch tooth body (1d) on the described mode transfer thread segment (1c), described pull bar adjustment nut (2) is by coarse pitch tooth body (1d) and described mode transfer thread segment (1c) threaded engagement.
2. injection machine draw rod structure according to claim 1, it is characterized in that: the pitch of described coarse pitch tooth body (1d) is 6mm.
3. injection machine draw rod structure according to claim 1, it is characterized in that: described coarse pitch tooth body (1d) is ball ridge body or trapezoidal-thread body; The pitch of described coarse pitch tooth body (1d) is determined according to the diameter of described pull bar (1), the diameter 45mm to 70mm that difference is corresponding, and pitch is 6mm; Or diameter 75mm to 140mm, pitch is 8mm; Or diameter 145mm to 180mm, pitch is 12mm.
4. injection machine draw rod structure according to claim 3, it is characterized in that: described pull bar adjustment nut (2) is clasp nut.
5. injection machine draw rod structure according to claim 4, it is characterized in that: described pull bar (1) includes pull bar smooth section (1a), stress groove (1b), mode transfer thread segment head end (1e).
6. injection machine draw rod structure according to claim 5, it is characterized in that: described stress groove (1b) external diameter is less than mode transfer thread segment (1c) external diameter.
7. injection machine draw rod structure according to claim 6, it is characterized in that: described stress groove (1b) external diameter is 0.6 times to 0.8 times of mode transfer thread segment (1c) external diameter.
8. injection machine draw rod structure according to claim 7, it is characterized in that: described mode transfer thread segment head end (1e) is cone shape.
9. injection machine draw rod structure according to claim 8 is characterized in that: match by C angle or R angle between described mode transfer thread segment head end (1e) and the described mode transfer thread segment (1c).
10. injection machine draw rod structure according to claim 9, it is characterized in that: described pull bar adjustment nut (2) outer peripheral face is held tightly and is combined with outer ring (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220364930 CN202727281U (en) | 2012-07-26 | 2012-07-26 | Pull rod structure of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220364930 CN202727281U (en) | 2012-07-26 | 2012-07-26 | Pull rod structure of injection molding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202727281U true CN202727281U (en) | 2013-02-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220364930 Expired - Fee Related CN202727281U (en) | 2012-07-26 | 2012-07-26 | Pull rod structure of injection molding machine |
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| CN (1) | CN202727281U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111844615A (en) * | 2020-07-17 | 2020-10-30 | 宁波市海达塑料机械有限公司 | Novel structure for reducing stress concentration of injection molding machine pull rod |
-
2012
- 2012-07-26 CN CN 201220364930 patent/CN202727281U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111844615A (en) * | 2020-07-17 | 2020-10-30 | 宁波市海达塑料机械有限公司 | Novel structure for reducing stress concentration of injection molding machine pull rod |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130213 Termination date: 20150726 |
|
| EXPY | Termination of patent right or utility model |