CN202846500U - Break-off prevention steam hammer - Google Patents
Break-off prevention steam hammer Download PDFInfo
- Publication number
- CN202846500U CN202846500U CN 201220521772 CN201220521772U CN202846500U CN 202846500 U CN202846500 U CN 202846500U CN 201220521772 CN201220521772 CN 201220521772 CN 201220521772 U CN201220521772 U CN 201220521772U CN 202846500 U CN202846500 U CN 202846500U
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- piston
- hole
- hammer
- hammer stem
- shaped
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Abstract
The utility model relates to a break-off prevention steam hammer which comprises a piston (1) and a hammer rod (2) which is fixedly connected with the piston (1). A step-shaped through hole is formed in the center of the piston (1). One end of the hammer rod (2) is in a step shape which is in fit with the shape of the through hole. The hammer rod is in interference fit with the step-shaped through hole of the piston through the step-shaped end portion of the hammer rod, and the fixing connection is achieved. The end with the small diameter of the step-shaped through hole is a straight hole. According to the structure, the step-shaped through hole is formed in the center of the piston so as to solve a phenomenon of rupture in the fit position of the hammer rod due to stress concentration in work. Due to the fact that the end with the small diameter of the step-shaped through hole is a straight hole, convenience is provided for machining of the through hole, precision is good when the piston and the hammer rod are assembled, convenience is provided for the assembly, and rod-broken accidents of the steam hammer are avoided.
Description
Technical field
The utility model relates to a kind of anti-steam hammer that fractures.
Background technology
Tradition hammer piston and hammer stem are cone match, because the machining of the conical surface of piston and hammer stem is not generally finished in same operation, cooperate the conical surface to be difficult to reach consistent so that conical surface assembly precision is poor, inevitably partially forge in working in addition, produce stress raisers at hammer stem, cause easily disconnected bar accident, and for preventing that the hammer stem load that is hit from coming off, and also needs hammer stem top riveting jail after the assembling.
The utility model content
The purpose of this utility model is the problem that solution has hammer piston now and hammer stem conical surface assembly precision is poor, steam hammer breaks bar easily.
The technical solution adopted in the utility model is: a kind of anti-steam hammer that fractures, comprise piston and the hammer stem that is fixedly connected with piston, described piston central authorities are provided with stepped through hole, one end of described hammer stem is the stairstepping suitable with shape of through holes, and hammer stem achieves a fixed connection by the stepped through hole formation interference fit of stairstepping end and piston.
As further improvement of the utility model: described stepped through-hole diameter is straight hole than small end.
Steam hammer in the utility model is like this assembling: piston is put into the resistance core oven; Piston is heated to a little more than 426 ℃ with stove; Take out after 2～3 hours in the insulation of stove domestic demand; The preprepared hammer stem is vertically put into piston hole by crane, and air cooling is to environment temperature, and the piston cooling is shunk nature and held hammer stem tightly, namely makes steam hammer of the present utility model.
The beneficial effect that the utility model adopts is: after having adopted this structure, consider in the work to produce hammer stem at the cooperation place phenomenon of rupture owing to stress is concentrated, be provided with stepped through hole in piston central authorities; Because stepped through-hole diameter is straight hole than small end, this is convenient to the processing of through hole, piston during with the hammer stem assembling precision good and be easy to assemble, the bar accident of breaking can not occur in steam hammer.
Description of drawings
Fig. 1 is the utility model schematic diagram.
Shown in the figure: 1 piston, 2 hammer stems.
The specific embodiment
Below in conjunction with Fig. 1, the utility model is described further.
As shown in Figure 1, a kind of anti-steam hammer that fractures, comprise piston 1 and the hammer stem 2 that is fixedly connected with piston 1, described piston 1 central authorities are provided with stepped through hole, one end of described hammer stem 2 is the stairstepping suitable with shape of through holes, hammer stem achieves a fixed connection by the stepped through hole formation interference fit of stairstepping end and piston, and described stepped through-hole diameter is straight hole than small end.
Frictional force during steam hammer work between dependence hammer stem and the piston is transmitted axial force.The size of frictional force is directly proportional with the magnitude of interference between mating surface, and the magnitude of interference is too small, and hammer stem and piston are easily loosening, the magnitude of interference is excessive, and frictional force is also large, but the abutting end of hammer stem can produce excessive cooperation stress in piston hole, even may above the yield limit of material, matching property be reduced.Rule of thumb formula δ/d 〉=0.0025mm(δ is the matching allowance of piston hole and hammer stem, d is piston and the nominal diameter that cooperates of hammer stem): δ 〉=0.0025 d=0.6mm, by tolerance fit table GB/T1184-1996 geometrical and toleranging, do not annotate tolerance value as can be known, select the cooperation of 240mmH7/z6.In machined, adopt basic hole system, first piston hole is processed by dimensional tolerance, then measure the actual size of portalling, according to the magnitude of interference, determine size and the tolerance of hammer stem, like this magnitude of interference that just can reach defined that cooperates in axle and hole.Consider in the work and produce hammer stem at the cooperation place phenomenon of rupture owing to stress is concentrated, be provided with stepped through hole in piston central authorities, so just, the step surface with the hammer stem vary in diameter moves in the piston hole, wherein main abutting end length is 170mm, not only overcome stress and concentrated, and hammer stem is reliably located in piston hole.Concentrate for prevention transition circle cylinder produces stress, in variable cross-section, adopt arc transition.The nominal value of fit diameter is respectively: epimere 240mm, hypomere 300mm.
Be the hot jacket assembling when hammer stem and Piston assembling, calculate the heating-up temperature of piston according to the maximum assembling magnitude of interference.In order hammer stem to be easier to pack into the through hole of piston central authorities, select fit-up gap δ '=0.5mm.When environment temperature is 20 ℃, material thermal expansion coefficient is 12 * 10-6/ ℃, theoretical heating-up temperature t:T=t '+(δ max+ δ ')/ad, t ' in the formula-environment temperature, δ max-maximum assembling magnitude of interference mm, δ '-fit-up gap mm; The thermal coefficient of expansion of a-piston material, d-cooperation nominal diameter mm.The substitution formula gets t=426 ℃.
Fully ready before suit, the processing of mating surface should meet Design Requirement Drawing, on the mating surface foul, greasy dirt, oxide skin etc. must not be arranged.During suit, operation should be rapid, and the time can not be long, in order to avoid piston temperature descends too much.According to accounting temperature, piston is shelved on the flatcar, push the resistance core oven, be heated to a little more than 426 ℃ with stove.In order to make piston each several part homogeneous thermal expansion in heating process, stove domestic demand insulation 2～3 hours, then take out.The preprepared hammer stem is vertically put into piston hole by crane, and air cooling is to environment temperature, and the piston cooling is shunk nature and held hammer stem tightly, namely makes steam hammer of the present utility model.
After having adopted this structure, consider in the work to produce hammer stem at the cooperation place phenomenon of rupture owing to stress is concentrated, be provided with stepped through hole in piston central authorities; Because stepped through-hole diameter is straight hole than small end, this is convenient to the processing of through hole, piston during with the hammer stem assembling precision good and be easy to assemble, the bar accident of breaking can not occur in steam hammer.
Claims (2)
1. prevent fractureing steam hammer for one kind, comprise piston (1) and the hammer stem (2) that is fixedly connected with piston (1), it is characterized in that described piston (1) central authorities are provided with stepped through hole, one end of described hammer stem (2) is the stairstepping suitable with shape of through holes, and hammer stem achieves a fixed connection by the stepped through hole formation interference fit of stairstepping end and piston.
2. a kind of anti-steam hammer that fractures according to claim 1 is characterized in that described stepped through-hole diameter is straight hole than small end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220521772 CN202846500U (en) | 2012-10-12 | 2012-10-12 | Break-off prevention steam hammer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220521772 CN202846500U (en) | 2012-10-12 | 2012-10-12 | Break-off prevention steam hammer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202846500U true CN202846500U (en) | 2013-04-03 |
Family
ID=47977736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220521772 Expired - Fee Related CN202846500U (en) | 2012-10-12 | 2012-10-12 | Break-off prevention steam hammer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202846500U (en) |
-
2012
- 2012-10-12 CN CN 201220521772 patent/CN202846500U/en not_active Expired - Fee Related
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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: 20130403 Termination date: 20131012 |