CN102954087A - Elastic pull-rod nut of injection molding machine - Google Patents
Elastic pull-rod nut of injection molding machine Download PDFInfo
- Publication number
- CN102954087A CN102954087A CN2012104743659A CN201210474365A CN102954087A CN 102954087 A CN102954087 A CN 102954087A CN 2012104743659 A CN2012104743659 A CN 2012104743659A CN 201210474365 A CN201210474365 A CN 201210474365A CN 102954087 A CN102954087 A CN 102954087A
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- nut
- stress
- injection molding
- molding machine
- tie bar
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Abstract
The invention discloses an elastic pull-rod nut of an injection molding machine, comprising a nut body and a conical body, wherein the nut body and an inner hole of the conical body are provided with thread holes; the connecting position between the attaching surface of the nut body and the conical body is provided with a stress-dispersing unloading groove which is continuously and rigidly designed; the radius R of the stress-dispersing unloading groove is 3-8mm. The elastic pull-rod nut disclosed by the invention ahas the advantages that the stress is dispersed to the rear part away from the attaching surface by the stress-dispersing unloading groove on the outer surface of the nut, the stressing on the front teeth away from the attaching surface is reduced, the stressing of teeth roots is greatly reduced, and the stressing of internal threads tends to be uniform, so that the stress distribution on the threads of a pull rod is more uniform, the stress concentration is greatly reduced, the problems caused by fatigue cracks are relieved and the service life of the pull rod is greatly prolonged.
Description
Technical field
The present invention relates to the nut on a kind of injection machine, especially a kind of and injection machine pull bar be used pull-rod nut, belong to mechanical field.
Background technique
Injection machine is a kind of machinery equipment of injection-moulding plastic, and in the process of its matched moulds, plate produces resiliently deformable through the power of pull-rod nut transmission to pull bar owing to being subjected to the end.In operation cycle, a plate stress deformation is delivered to pull bar through pull-rod nut, forms the alternative cycle compound stress.Pull bar is under the effect of this alternating compound stress, and the screw thread contacting point is because stress concentrate to form the tired microscopic crack of screw thread tooth base, and then crackle constantly expands and form pull rod screw root of the tooth place and destroy, until whole fracture of pull bar, thereby cause machine to produce.Therefore, avoiding the fracture of pull bar is one of big event of Injection Molding Machine Design.
Mainly the taking of the at present design of the injection machine pull bar in the industry strengthened the pull bar diameter, adds the major part plate thickness and then strengthened its intensity, and comparatively advanced way is to adopt the structure of Tension Nut to come the stress value at divergent root place to reduce the way that stress concentrates to realize.Effect is not fairly obvious though the result is improved often.Though being it, main cause recognized the principal element that causes the pull bar fracture, and some measures have been taked, even adopt flexible Tension Nut, can relax part stress and concentrate excessive problem, but because the restriction of nut structure size, transition between nut and a plate surface of contact and the taper flexible portion can not be adopted the very large round-corner transition of wishing, this structurally causes pull rod screw to concentrate situation still very serious at nut and 1～2 pitch thread position bottom stress at a plate surface of contact rear portion with regard to the problem that has produced the rigidity sudden change; Also can play a role though strengthen in addition the method for pull bar diameter and a thickening enhancing plate, the stress of pull rod screw contacting point is concentrated effectively low to less level, also can greatly increase the cost of machine.
Summary of the invention
The present invention seeks to overcome the deficiency that exists in the existing pull-rod nut technology, the pull rod screw stress raisers that provide a kind of rigidity sudden change problem of avoiding pull rod screw to cause because of the nut structure restriction to cause, so that pull rod screw is effectively disperseed to thereafter screw thread as much as possible at 1～2 pitch thread position bottom stress at nut and a plate surface of contact rear portion, make the stress distribution on the pull rod screw more even, problem of stress concentration further improves.
The present invention adopts following technological scheme for achieving the above object:
A kind of elastic tie bar nut of injection molding machine of the present invention, comprise nut body and cone, be provided with tapped hole at nut body and pyramidal endoporus, there is the dispersive stress compensating groove of continuous rigidity Design at the faying surface of described nut body and the place of joining between the cone, and dispersive stress compensating groove radius is R=3～8mm.
Described tapped hole is the assemblying body of cone shape screwed hole of centre and cylindrical shape screwed hole of centre.
The angle of inclination of described coniform external surface is 8 °.
The pitch of described tapped hole is p=3～8mm.
The faying surface of described nut body to the length of fastening straight trough tail end is got 30～130mm.
The exterior edge face of described nut body is provided with many fastening nuts straight troughs of fastening usefulness.
The main force part of pull-rod nut of the present invention is positioned at the faying surface rear portion, pull rod screw is effectively disperseed to thereafter screw thread as much as possible at 1～2 pitch thread position bottom stress at nut and a plate surface of contact rear portion, the stress distribution that is subject on the pull rod screw, stress is concentrated greatly and is reduced, fatigue crack has problems and is eased, and greatly improve the working life of pull bar.
Description of drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is sectional view of the present invention.
Embodiment
The invention will be further described below in conjunction with concrete accompanying drawing.
Such as Fig. 1～shown in Figure 2: the pull-rod nut of injection machine comprises nut body 1, cone 2, center internal thread 3, dispersive stress compensating groove 4 and fastening nuts straight trough 5.
The present invention includes nut body 1, the middle part of described nut body 1 is provided with screwed hole of centre 3;
The described nut center diameter of thread is M=40～230mm.；
The height of described coniform body 2 is h, and Outside diameter is d, gets h=0.7M, d=1.4M;
The height of described nut body is H, and Outside diameter is D, gets H=1.5M, D=2.2M;
Described cone shape 2 outer surfaces are to the dispersive stress groove 4 of nut body 1 cylindrical body outside in conjunction with intermediate location, and radius is R3;
Described cone 2 shape outer surface angles of inclination are about 5 °～8 °;
The pitch of described screw thread 3 is that p=gets 3～8mm;
The length that the outside end face of described nut body 1 is opened binding groove 3 is H-h;
Working principle of the present invention: the pull bar on pull-rod nut of the present invention and the injection machine is used, because coniform body 2 internal surfaces adopt continuous rigidity Design (Inside concave fillet R3) to outer surface inclination and the binding site of nut body 1, avoided the rigidity sudden change of nut structure and the load that is delivered on the pull rod screw has been carried out the structural design of disperseing, so that the load of pull-rod nut faying surface is when being delivered on coniform body 2 center screws 3, dispersive stress groove by the junction disperses stress to the rear portion away from faying surface, stressed the reducing of front several teeth away from faying surface, root of the tooth stress reduces greatly, the stressed trend of internal thread is even, thereby so that the stress distribution that is subject on the pull rod screw is more uniform, stress is concentrated greatly and is reduced, fatigue crack has problems and is eased, and greatly improve the working life of pull bar.The above only is the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment the present invention is had been described in detail, for a person skilled in the art, it still can be made amendment to the technological scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characteristics wherein is equal to replacement.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. elastic tie bar nut of injection molding machine, comprise nut body (1) and cone (2), endoporus at nut body (1) and cone (2) is provided with tapped hole (3), it is characterized in that the faying surface of described nut body (1) and the dispersive stress compensating groove (4) that there is continuous rigidity Design at the place of joining between the cone (2), dispersive stress compensating groove (4) radius is R=3～8mm.
2. elastic tie bar nut of injection molding machine as claimed in claim 1, it is characterized in that: described tapped hole (3) is the assemblying body of cone shape screwed hole of centre and cylindrical shape screwed hole of centre.
3. elastic tie bar nut of injection molding machine as claimed in claim 1, it is characterized in that: the angle of inclination of described coniform external surface is 8 °.
4. elastic tie bar nut of injection molding machine as claimed in claim 1, it is characterized in that: the pitch of described tapped hole (3) is p=3～8mm.
5. elastic tie bar nut of injection molding machine as claimed in claim 1, it is characterized in that: the faying surface of described nut body (1) to the length of fastening straight trough (5) tail end is got 30～130mm.
6. elastic tie bar nut of injection molding machine as claimed in claim 1, it is characterized in that: the exterior edge face of described nut body (1) is provided with many fastening nuts straight troughs (5) of fastening usefulness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104743659A CN102954087A (en) | 2012-11-21 | 2012-11-21 | Elastic pull-rod nut of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104743659A CN102954087A (en) | 2012-11-21 | 2012-11-21 | Elastic pull-rod nut of injection molding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102954087A true CN102954087A (en) | 2013-03-06 |
Family
ID=47763323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012104743659A Pending CN102954087A (en) | 2012-11-21 | 2012-11-21 | Elastic pull-rod nut of injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102954087A (en) |
Cited By (2)
| 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 |
| CN115111248A (en) * | 2022-08-02 | 2022-09-27 | 远景能源有限公司 | Embedded bolt sleeve and wind driven generator |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3640208A1 (en) * | 1986-11-25 | 1987-04-30 | Eberhard Prof Dipl Ing Seidel | Threaded nut consisting of fibrous composite material, and process for the production thereof |
| CN2361518Y (en) * | 1999-04-22 | 2000-02-02 | 隋锡致 | Extrusion cutting pin for electric point machine |
| CN2465929Y (en) * | 2001-02-28 | 2001-12-19 | 夏善海 | Elastic tie bar nut of injection molding machine |
| CN2748351Y (en) * | 2004-10-15 | 2005-12-28 | 隋锡致 | Squeezing-cutting pin of electric switch machine |
| CN201180724Y (en) * | 2008-01-15 | 2009-01-14 | 徐伟甫 | Elastic pull-rod nut of injection molding machine |
| CN201507540U (en) * | 2009-10-15 | 2010-06-16 | 中国北车集团大同电力机车有限责任公司 | Axle shaft structure |
| US20110150602A1 (en) * | 2008-04-12 | 2011-06-23 | Sieper Guenter | Method for producing a moulded part with an annular cross-section and moulded part produced according to a method of this type |
| CN201982448U (en) * | 2011-01-04 | 2011-09-21 | 无锡海天机械有限公司 | Pull-rod nut of injection molding machine |
| CN202274068U (en) * | 2011-10-11 | 2012-06-13 | 华锐风电科技(集团)股份有限公司 | Oil tank wall unloading groove of gearbox of wind turbine generator system |
| CN202381492U (en) * | 2011-11-26 | 2012-08-15 | 佛山市宝捷精密机械有限公司 | Pull-rod nut for injection molding machine with unloading slot |
| CN203035705U (en) * | 2012-11-21 | 2013-07-03 | 无锡海天机械有限公司 | Elastic pull-rod nut of injection molding machine |
-
2012
- 2012-11-21 CN CN2012104743659A patent/CN102954087A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3640208A1 (en) * | 1986-11-25 | 1987-04-30 | Eberhard Prof Dipl Ing Seidel | Threaded nut consisting of fibrous composite material, and process for the production thereof |
| CN2361518Y (en) * | 1999-04-22 | 2000-02-02 | 隋锡致 | Extrusion cutting pin for electric point machine |
| CN2465929Y (en) * | 2001-02-28 | 2001-12-19 | 夏善海 | Elastic tie bar nut of injection molding machine |
| CN2748351Y (en) * | 2004-10-15 | 2005-12-28 | 隋锡致 | Squeezing-cutting pin of electric switch machine |
| CN201180724Y (en) * | 2008-01-15 | 2009-01-14 | 徐伟甫 | Elastic pull-rod nut of injection molding machine |
| US20110150602A1 (en) * | 2008-04-12 | 2011-06-23 | Sieper Guenter | Method for producing a moulded part with an annular cross-section and moulded part produced according to a method of this type |
| CN201507540U (en) * | 2009-10-15 | 2010-06-16 | 中国北车集团大同电力机车有限责任公司 | Axle shaft structure |
| CN201982448U (en) * | 2011-01-04 | 2011-09-21 | 无锡海天机械有限公司 | Pull-rod nut of injection molding machine |
| CN202274068U (en) * | 2011-10-11 | 2012-06-13 | 华锐风电科技(集团)股份有限公司 | Oil tank wall unloading groove of gearbox of wind turbine generator system |
| CN202381492U (en) * | 2011-11-26 | 2012-08-15 | 佛山市宝捷精密机械有限公司 | Pull-rod nut for injection molding machine with unloading slot |
| CN203035705U (en) * | 2012-11-21 | 2013-07-03 | 无锡海天机械有限公司 | Elastic pull-rod nut of injection molding machine |
Cited By (2)
| 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 |
| CN115111248A (en) * | 2022-08-02 | 2022-09-27 | 远景能源有限公司 | Embedded bolt sleeve and wind driven generator |
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Application publication date: 20130306 |