CN201186422Y - Double-ended double-screw bolt screw tightening device - Google Patents
Double-ended double-screw bolt screw tightening device Download PDFInfo
- Publication number
- CN201186422Y CN201186422Y CNU2008200978781U CN200820097878U CN201186422Y CN 201186422 Y CN201186422 Y CN 201186422Y CN U2008200978781 U CNU2008200978781 U CN U2008200978781U CN 200820097878 U CN200820097878 U CN 200820097878U CN 201186422 Y CN201186422 Y CN 201186422Y
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- sleeve
- thread
- studs
- double
- swivel nut
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Abstract
The utility model relates to a fastening device of a double-headed stud-bolt, wherein the front section of a thread sleeve central hole is an unthreaded hole, the diameter of the unthreaded hole is larger than the middle section and is less than the rear section, wherein the middle section of the thread sleeve central hole is processed with a first inner thread, the thread lift angle of the first inner thread is corresponding with the double-headed stud-bolt, the rear section of the thread sleeve central hole is processed with a second inner thread, the thread lift angle of the second inner thread is 7-10 degrees, the front end of a push-rod is extended into the rear section of the thread sleeve central hole, an external thread on the front section of the push rod is matched with the second inner thread, the rear end of the push rod is extended into a sleeve and is fixed with the sleeve through a driving pin, and a sleeve stop is arranged on the front end of the sleeve, and the sleeve stop and a thread sleeve stop which is arranged on the rear end of the thread sleeve are limited with each other on the circumferential direction. The fastening device can effectively prevent the double-headed stud-bolt from being retreated with the thread sleeve from a basic body, and the device guarantees the success rate of the assembly of the double-headed stud-bolt and greatly improves the assembly efficiency, and the utility model has the characteristics of simple structure, convenient operation, reliable performances and the like.
Description
Technical field
The utility model relates to a kind of assembly tool, relates in particular to the studs tightening device.
Background technology
Studs is a kind of in the securing member, and it must finish the connection of two parts through twice assembling nut of just screwing on, and reaches the purpose of fastening parts.The particularity of studs is: after being contained in it on the matrix, just become pile, pile has guidance quality, and the cover that is easy to go here and there need guarantee the sealing after two parts assemble at the sealing gasket of two parts junctions embedding.The assembling of studs need just can be finished by special instrument.The studs tightening device that uses is to adopt the external force rotary threaded sleeve at present, the tail end of studs is screwed in swivel nut, contact the pressure that produces with the studs end face by the push rod in the swivel nut again its head end is screwed in the matrix, by reverse rotation power swivel nut is screwed off from studs at last.But in practical set, treat that studs installs to when screwing off swivel nut on the matrix, often easily studs is pulled down from matrix, its reason is: after the studs tail end is screwed into the instrument swivel nut, its end face is subjected to holding out against of push rod can produce torsional forces, the thread of this end of studs is close to mutually with the alveolus of swivel nut, and both snap-in forces are bigger; The head end of studs is then different, after this end is screwed into the matrix screw, just will hold the imperfect thread of thread root to embed in the imperfect alveolus of screw, push the generation interference, and then generation torsional forces, these imperfect threads have only the length of run of complete thread one circle, all the other all complete threads are in vacant state (except the special interference screw thread), so the snap-in force between studs and the matrix is less, like this in the process that withdraws from the instrument swivel nut, studs must withdraw from matrix along with the instrument swivel nut, causes the assembling failure.
Chinese patent ZL 200720018475.9 discloses a kind of stud-bolt assembling device on January 23rd, 2008, one end of fastening jackscrew screws in the swivel nut, the other end is provided with drive pin, described swivel nut is arranged with two along the axially extended projection in the fastening jackscrew outside, projection lays respectively at the anglec of rotation of the both sides of drive pin with the control drive pin, in the outside of swivel nut suit drive sleeve, insert respectively in the translot of offering on the drive sleeve at the two ends of drive pin.During the assembling studs, by drive pin drive fastening jackscrew earlier after rotation one angle with swivel nut upper protruding block one end in contact and drive swivel nut and rotate, the studs tail end is screwed in the swivel nut,, drive studs by pressure and rotate it is assembled on the matrix with after fastening jackscrew contacts in stud end portions; And when pulling down assembler, the drive pin that then reverses makes it drive the first counter-rotating of fastening jackscrew one angle and separates with stud end portions, and drive pin contacts and drive the swivel nut counter-rotating with the projection other end then, and swivel nut is pulled down.This stud-bolt assembling device is attempted to remove the pressure of fastening jackscrew to studs earlier to decompose the mode of snap-in force between assembler and the studs, swivel nut is pulled down from studs again.But because swivel nut and fastening jackscrew all adopt the screw thread identical with studs, like this after studs is seated, snap-in force between studs and the matrix is roughly suitable with the snap-in force between studs and the swivel nut, when attempting to remove the pressure of fastening jackscrew by drive pin, because of equilibrium of forces can not be realized, fastening jackscrew very easily drives the studs rotation by swivel nut, studs is withdrawed from from matrix, cause the assembling failure, so the success rate and the efficient of studs assembling are not high always.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of studs tightening device, withdraws from from matrix effectively to prevent studs.
The technical solution of the utility model is as follows: a kind of studs tightening device, comprise swivel nut, push rod, drive pin and sleeve, its key is: before, during and after the centre bore of described swivel nut is divided into three sections, wherein the leading portion of swivel nut centre bore is a unthreaded hole, the diameter of this unthreaded hole is greater than the stage casing but less than back segment, be provided with first internal thread in the stage casing of described swivel nut centre bore, the lead angle of this first internal thread is corresponding with studs, back segment at described swivel nut centre bore is provided with second internal thread, and the lead angle of this second internal thread is 7～10 °; The front end of described push rod stretches into the back segment of swivel nut centre bore, the external screw thread of push rod front portion matches with second internal thread, the rear end of described push rod is stretched in the sleeve, and fix by drive pin and sleeve, front end at described sleeve is provided with the sleeve block, the swivel nut block that this sleeve block and swivel nut rear end are provided with is upwards spacing mutually in week, and the length of sleeve block is greater than the length of swivel nut block.
Adopt above technical scheme, the about deeply 2.5mm of the unthreaded hole of swivel nut centre bore leading portion plays the guiding studs.Two sections different internal threads of design on the swivel nut, wherein the lead angle of first internal thread is corresponding with studs, be not more than 4 °, the lead angle of second internal thread is greater than first internal thread, frictional force between second internal thread and push rod helps removing the pressure of push rod to studs less than the frictional force between first internal thread and studs when the dismounting swivel nut when assembling like this.The length of sleeve block is greater than the length of swivel nut block, under the sleeve block and the spacing mutually effect that makes progress in swivel nut block week, swivel nut and sleeve can rotate mutually, the corner of swivel nut and sleeve is more than or equal to 90 °, because the scope that swivel nut and sleeve rotate is little, and second internal thread is longer, and swivel nut can not come off in rotating process like this.
When the utility model is used to assemble studs, head end with studs screws in matrix 2～3 threads earlier, then the swivel nut in the utility model is aimed at the tail end of studs, control the sleeve rotation again, after sleeve turns an angle, sleeve block and swivel nut block are fitted, sleeve moves by the direction of drive pin drive push rod towards studs, this moment, the studs tail end screwed in the stage casing of swivel nut centre bore under the guiding of swivel nut leading portion unthreaded hole, the front end of push rod combines and produces certain pressure with the end face of studs tail end, the rotation of driving studs, the head end of studs further screws in the matrix; When the imperfect thread for the treatment of studs head end thread root soon screws in matrix, the push rod front end strengthens gradually to the pressure of studs breech face, be to paste more and more tightlyer between the external screw thread of first internal thread in swivel nut centre bore stage casing and studs, both frictional force strengthen; Sleeve continues rotation, until the imperfect thread of studs head end is screwed into the matrix screw, produces threaded engagement power between studs and the matrix.This moment under the effect that holds out against of push rod, the frictional force between swivel nut and the studs with the snap-in force between studs and the matrix about equally, but greater than the frictional force between second internal thread and push rod.
When withdrawing from the studs tightening device, the reverse rotation of control sleeve, because the lead angle of second internal thread is greater than first internal thread in the swivel nut, frictional force between second internal thread and push rod is less than the frictional force between first internal thread and studs, push rod rotates with respect to swivel nut earlier under the drive of sleeve like this, the front end of push rod separates with the studs breech face, the pressure that acts on the studs is removed, the thread of studs tail end is in vacant state with respect to first internal thread of swivel nut, and this moment, swivel nut was equivalent to be enclosed within the nut on the studs; Behind the sleeve backward rotation certain angle, sleeve block and swivel nut block are oppositely fitted, sleeve drives swivel nut by sleeve block and swivel nut block and rotates on studs, until withdrawing from from studs fully, and keeps motionless under the effect of studs threaded engagement power between itself and matrix.
The lead angle of swivel nut centre bore back segment second internal thread is advisable with 7～10 ° in the utility model, the lead angle of second internal thread is too little, then little with the difference of first internal thread, there is the problem of when withdrawing from tightening device studs being taken out of easily, cause the reliability variation of assembling; The lead angle of second internal thread is too big, and then the size of parts such as swivel nut and push rod must and then strengthen, and not only there is no need, but also can cause waste of material, and cost increases.
The length L of first internal thread segment is 5～9mm in the above-mentioned swivel nut centre bore.The length of first internal thread segment is too little, the double-screw bolt specification that does not adapt with it; The length of first internal thread segment is too big, and the time lengthening of then assembling and withdrawing from has correspondingly reduced efficiency of assembling.
For the ease of processing, and guarantee the stationarity that moment of torsion transmits, be symmetrically arranged with two swivel nut blocks in the rear end of above-mentioned swivel nut, the front end of sleeve is symmetrically arranged with two sleeve blocks, described two sleeve blocks and two swivel nut block interlaced arrangement.
Outside at above-mentioned swivel nut and sleeve joint is set with protective sleeve, and protective sleeve plays security protection, and the finger with the workman when preventing the applying of sleeve block and swivel nut block crushes.
The rear portion of above-mentioned sleeve centre bore is a square hole, and the central authorities of this square hole four sides inwall respectively have an arc groove.The square hole at sleeve rear portion helps and tool engagement such as square tenon spanner, torque spanner, pneumtic impact wrench; Arc groove plays position-limiting action to the steel ball of instrument firearm head, and four faces all are provided with arc groove, so only needs that the rifle head is inserted the sleeve square hole and gets final product, and has correspondingly saved bit time.
The surface of above-mentioned push rod front end is a sphere, and sphere contacts with studs tail end millet cake, and is quicker, reliable when removing push rod to the pressure of studs.
Beneficial effect: the utility model can prevent effectively that studs from withdrawing from from matrix with swivel nut, has ensured the success rate of studs assembling, has improved efficiency of assembling greatly, has characteristics such as simple in structure, easy and simple to handle, dependable performance.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is the A-A cutaway view of Fig. 1.
Fig. 3 is the B-B cutaway view of Fig. 1.
Fig. 4 is the structural representation of swivel nut in the utility model.
Fig. 5 is the left view of Fig. 4.
Fig. 6 is the structural representation of the utility model middle sleeve.
Fig. 7 is the left view of Fig. 6.
Fig. 8 is used to assemble the view of studs for the utility model.
The specific embodiment
The utility model is described in further detail below in conjunction with drawings and Examples:
As Fig. 1, Fig. 2, Fig. 4 and shown in Figure 5, the utility model is made of parts such as swivel nut 1, push rod 2, drive pin 3, sleeve 4 and protective sleeves 5.Before, during and after wherein the centre bore of swivel nut 1 is divided into three sections, the leading portion of swivel nut 1 centre bore is a unthreaded hole, and the diameter of this unthreaded hole is greater than the stage casing but less than back segment, and the length of unthreaded hole is about 2.5mm, plays the guiding studs.The stage casing of described swivel nut 1 centre bore is the screwed hole that length L equals 5～9mm, promptly is processed with the first isometric with it internal thread 1b in the stage casing of swivel nut 1 centre bore, and the lead angle of this first internal thread 1b is corresponding with studs, is no more than 4 °.The back segment length of described swivel nut 1 centre bore is about 15mm, and the front portion of this back segment is a unthreaded hole, and the rear portion is processed with the second internal thread 1c, and the lead angle of this second internal thread 1c is 7～10 °.Be provided with two all-in-one-piece swivel nut block 1a with it in the rear end of described swivel nut 1, two swivel nut block 1a are the center symmetric arrangement with the axis of swivel nut 1.
As Fig. 1, Fig. 2, Fig. 6 and shown in Figure 7, the front end of push rod 2 stretches into the back segment of swivel nut 1 centre bore, and the surface of these push rod 2 front ends is a sphere.Outer surface in push rod 2 front portions is processed with external screw thread, and the second internal thread 1c on this external screw thread and the swivel nut 1 is suitable, and both link together by threaded engagement.The rear end of push rod 2 is stretched in the sleeve 4, and is fixing with sleeve 4 by the drive pin 3 that radially wears.The axis of the axis of described sleeve 4 and swivel nut 1 is provided with two all-in-one-piece sleeve block 4a with it at the front end of sleeve 4 on same straight line, two sleeve block 4a are the center symmetric arrangement with the axis of sleeve 4.The length of sleeve block 4a is greater than the length of swivel nut block 1a, and two sleeve block 4a and two swivel nut block 1a are positioned on the same circumference, and interlaced arrangement, and sleeve block 4a and swivel nut block 1a are upwards spacing mutually in week.
Also as can be known, be set with protective sleeve 5 in the outside of swivel nut 1 and sleeve 4 joints from Fig. 1, Fig. 3, Fig. 6 and Fig. 7, sleeve block 4a and swivel nut block 1a all are positioned at protective sleeve 5.The rear portion of sleeve 4 centre bores is a square hole, so that engage with the rifle head of instruments such as square tenon spanner, torque spanner, pneumtic impact wrench; The central authorities of described square hole four sides inwall respectively have an arc groove 4b, help engaging fast with the steel ball of instrument firearm head, and the assurance instrument engages closely with sleeve 4.
As shown in Figure 8, the utility model is work like this:
When being used to assemble studs 6 (is example with the right-handed thread), rear end cover with sleeve 4 installs on the rifle head of pneumtic impact wrench earlier, then the head end with studs 6 screws in 2～3 threads in the matrix 7, make swivel nut 1 aim at the tail end of studs 6 then, scratching moving pneumtic impact wrench drive sleeve 4 turns clockwise, after sleeve 4 rotates 90 °, swivel nut block 1a corresponding on sleeve block 4a and the rotation direction fits, sleeve 4 moves by the direction of drive pin 3 drive push rods 2 towards studs 6, this moment, studs 6 tail ends screwed in the stage casing of swivel nut 1 centre bore under the guiding of swivel nut 1 leading portion unthreaded hole, the front end of push rod 2 combines and produces certain pressure with the end face of studs 6 tail ends, drive studs 6 and turn clockwise, the head end of studs 6 further screws in the matrix 7; When the imperfect thread for the treatment of studs 6 head end thread roots soon screws in matrix 7, push rod 2 front ends strengthen gradually to the pressure of studs 6 breech faces, be to paste more and more tightlyer between the external screw thread of the first internal thread 1b in swivel nut 1 centre bore stage casing and studs 6, both frictional force strengthen; Sleeve 4 continues rotation, until the imperfect thread of studs 6 head ends is screwed into matrix 7 screws, produces threaded engagement power between studs 6 and the matrix 7.This moment under the effect that holds out against of push rod 2, the frictional force between swivel nut 1 and the studs 6 with the snap-in force between studs 6 and the matrix 7 about equally, but greater than the frictional force of 2 of the second internal thread 1c and push rods.
When withdrawing from the studs tightening device, control sleeve 4 is rotated counterclockwise, because the lead angle of the second internal thread 1c is greater than the first internal thread 1b in the swivel nut 1, the frictional force that the second internal thread 1c and push rod are 2 is less than the frictional force of 6 of the first internal thread 1b and studs, push rod 2 rotates with respect to swivel nut 1 earlier under the drive of sleeve 4 like this, the front end of push rod 2 separates with studs 6 breech faces, the pressure that acts on the studs 6 is removed, the thread of studs 6 tail ends is in vacant state with respect to the first internal thread 1b of swivel nut 1, and this moment, swivel nut 1 was equivalent to be enclosed within the nut on the studs 6; After sleeve 4 rotates counterclockwise 90 °, swivel nut block 1a corresponding on sleeve block 4a and the rotation direction fits, sleeve 4 drives swivel nut 1 by sleeve block 4a and swivel nut block 1a and rotates on studs 6, until withdrawing from from studs 6 fully, and keep motionless under the effect of studs 6 threaded engagement power between itself and matrix 7.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200978781U CN201186422Y (en) | 2008-03-25 | 2008-03-25 | Double-ended double-screw bolt screw tightening device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200978781U CN201186422Y (en) | 2008-03-25 | 2008-03-25 | Double-ended double-screw bolt screw tightening device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201186422Y true CN201186422Y (en) | 2009-01-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200978781U Expired - Fee Related CN201186422Y (en) | 2008-03-25 | 2008-03-25 | Double-ended double-screw bolt screw tightening device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201186422Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101543985B (en) * | 2008-03-24 | 2010-11-10 | 力帆实业(集团)股份有限公司 | A stud tightening device |
| CN103286730A (en) * | 2013-06-21 | 2013-09-11 | 无锡市飞玛斯精密科技有限公司 | Stud implanting wrench |
| CN103612233A (en) * | 2013-12-12 | 2014-03-05 | 苏州道森钻采设备股份有限公司 | Quick stud screwing tool |
| CN104029161A (en) * | 2014-06-04 | 2014-09-10 | 成都来宝石油设备有限公司 | Combined protective sleeve for assembling screw |
| CN109746870A (en) * | 2019-03-08 | 2019-05-14 | 中铁工程装备集团有限公司 | Studs screwing device |
-
2008
- 2008-03-25 CN CNU2008200978781U patent/CN201186422Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101543985B (en) * | 2008-03-24 | 2010-11-10 | 力帆实业(集团)股份有限公司 | A stud tightening device |
| CN103286730A (en) * | 2013-06-21 | 2013-09-11 | 无锡市飞玛斯精密科技有限公司 | Stud implanting wrench |
| CN103612233A (en) * | 2013-12-12 | 2014-03-05 | 苏州道森钻采设备股份有限公司 | Quick stud screwing tool |
| CN103612233B (en) * | 2013-12-12 | 2017-04-12 | 苏州道森钻采设备股份有限公司 | Quick stud screwing tool |
| CN104029161A (en) * | 2014-06-04 | 2014-09-10 | 成都来宝石油设备有限公司 | Combined protective sleeve for assembling screw |
| CN109746870A (en) * | 2019-03-08 | 2019-05-14 | 中铁工程装备集团有限公司 | Studs screwing device |
| CN109746870B (en) * | 2019-03-08 | 2023-04-28 | 中铁工程装备集团有限公司 | Double-end stud screwing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090128 |