CN113772535A - Hook group for shot blasting and preparation method thereof - Google Patents
Hook group for shot blasting and preparation method thereof Download PDFInfo
- Publication number
- CN113772535A CN113772535A CN202111140788.2A CN202111140788A CN113772535A CN 113772535 A CN113772535 A CN 113772535A CN 202111140788 A CN202111140788 A CN 202111140788A CN 113772535 A CN113772535 A CN 113772535A
- Authority
- CN
- China
- Prior art keywords
- connecting rod
- hook
- connecting plate
- shot blasting
- nut
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005422 blasting Methods 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 238000004458 analytical method Methods 0.000 claims abstract description 9
- 125000006850 spacer group Chemical group 0.000 claims abstract description 5
- 230000007704 transition Effects 0.000 claims abstract description 5
- 238000007670 refining Methods 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 239000004677 Nylon Substances 0.000 claims description 6
- 229920001778 nylon Polymers 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 238000005480 shot peening Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 238000009826 distribution Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 9
- 239000004576 sand Substances 0.000 description 3
- 238000005488 sandblasting Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/22—Rigid members, e.g. L-shaped members, with parts engaging the under surface of the loads; Crane hooks
- B66C1/34—Crane hooks
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
- C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
A kind of shot-blasting treatment uses the hook group and its preparation method, including a pair of tie rods, cross bar, tie plate, spacer, nut and lifting hook, set up several cross bars evenly between the tie rods, the bottom end of the tie rod is fixed the tie plate and installed through spacer and nut 5, the central position of the tie plate fixes the lifting hook, increase the diameter or quantity of cross bar and tie rod threaded diameter, increase the transition circular arc in the step of the tie rod, and carry on the heat treatment to the tie rod, improve the mechanical property; and a rubber gasket is additionally arranged between the connecting plate and the connecting rod. And analyzing the stress distribution condition of the weak part by adopting a finite element analysis method, and optimizing the diameter or the number of the cross rods and increasing the thread diameter of the connecting rod until the strength requirement is met.
Description
Technical Field
The invention belongs to the technical field of engineering machinery, and particularly relates to a hook group for shot blasting and a preparation method thereof.
Background
Shot peening, also called shot peening, is one of the effective methods for reducing fatigue and prolonging the service life of parts by spraying high-speed shots on the surface of the parts to cause plastic deformation of the surface layers of the parts and form a strengthening layer with a certain thickness. The shot blasting treatment needs to be carried out on hoisting equipment, namely, shot blasting treatment in all directions is carried out on hoisting parts of a hook group, and the hook group for shot blasting treatment generally comprises parts such as a connecting rod, a connecting plate, a hook, a cross rod, a nut and an elastic washer. The design of this lifting hook group does not consider that the peening processing in-service use operating mode is abominable, and the lifting hook group not only bears the power of perpendicular hanging weight, still considers the peening to part lateral thrust, still considers the influence of sandblast to lifting hook group part simultaneously, so use very short time, the breakage takes place in connecting rod and connecting plate cooperation position department in the lifting hook group. In consideration of the working condition that the workpiece has lateral thrust during shot blasting, strength analysis is carried out on the hook groups, and the cross bars are found to have larger stress, namely 296.88MPa at most, the stress is larger, and the deformation is easy to occur; meanwhile, the stress of a cylindrical surface area (a fracture position) at the assembling position of the connecting plate is 289.3MPa, the material used by the connecting rod is 45 steel, the yield strength of the connecting rod is 355MPa generally, the safety coefficient is only 1.2, and the connecting rod is easy to fatigue. .
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a hook group for shot blasting and a preparation method thereof, wherein the diameter or the number of cross rods and the diameter of the thread of a connecting rod are increased, transition arcs are added at the step of the connecting rod, and the connecting rod is subjected to heat treatment to improve the mechanical property; and a rubber gasket is additionally arranged between the connecting plate and the connecting rod. And analyzing the stress distribution condition of the weak part by adopting a finite element analysis method, and optimizing the diameter or the number of the cross rods and increasing the thread diameter of the connecting rod until the strength requirement is met.
The invention provides a hook group for shot blasting, which comprises a pair of connecting rods (1), cross rods (2), connecting plates (3), gaskets (4), nuts (5) and hooks (6), wherein a plurality of cross rods (2) are uniformly arranged between the connecting rods (1), the lower ends of the connecting rods (1) are fixedly connected with the connecting plates through the gaskets (4) and the nuts (5), and the hooks (6) are fixed at the center positions of the connecting plates (3).
As a further technical scheme of the invention, the lower end of the connecting rod (1) penetrates through the connecting plate (3), the lower side of the connecting rod is in threaded connection with the nut (5) and is fixed with the connecting plate (3), and the gasket (4) is arranged between the nut (5) and the connecting plate (3).
Furthermore, the diameter of the cross rod is 25mm, and the fixing thread at the lower part of the connecting rod is M30.
Further, the connecting rod is made of 45 steel, and is subjected to thermal refining until the tensile strength Rm is more than or equal to 630MPa and the yield strength Rp0.2 is more than or equal to 370 MPa.
Further, gasket (4) are sand control nylon packing ring, connecting thread has on the bottom of connecting rod (1), and its top all sets up the connecting hole.
Furthermore, the central point of connecting plate (3) puts and sets up the fixed slot, the upper end of lifting hook (6) is passed the fixed slot with connecting plate (3) joint.
The invention also provides a preparation method of the hook group for shot blasting treatment, which comprises the following steps,
step S1, welding the workpiece at equal intervals according to the condition that the maximum lifting capacity is 3 tons, the workpiece is lifted to cause 5-degree deflection in the side pushing direction when shot blasting is carried out, the diameter b of the cross rods is 25mm, and the number of the cross rods is 3; adjusting a fixed thread e at the lower part of the connecting rod to be M30, increasing a fillet at a transition position d to be r =2mm, and performing thermal refining on the connecting rod to improve the mechanical property of the connecting rod, wherein the connecting rod is made of 45 steel and is subjected to thermal refining until the tensile strength Rm is more than or equal to 630MPa and the yield strength Rp0.2 is more than or equal to 370 MPa; the sand-proof nylon gasket is added at the mounting position of the connecting rod and the connecting plate.
S2, carrying out load analysis on the hook groups, wherein the equivalent stress of the cross bar is reduced to 134.76MPa from 296.88MPa, and the equivalent stress of a fracture position is reduced to 119.52MPa from 289.3 MPa;
step S3, checking the fatigue safety coefficient according to the impact load, wherein the strength is [ n ]]b =630/134.76=4.67，[n]s=370/134.76=2.74。
The invention has the advantages that the hook group has simple structure, the weak part can be quickly and accurately determined through smaller change and design of a finite element analysis method, optimization measures are put forward in a targeted manner, the quality cost and the fracture failure risk are reduced, and the quality level of the hook group is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the joint between the connecting rod and the connecting plate of the present invention.
Detailed Description
Referring to fig. 1 and 2, the present embodiment provides a hook set for shot blasting, including a pair of connecting rods 1, cross rods 2, a connecting plate 3, spacers 4, nuts 5 and hooks 6, wherein a plurality of cross rods 2 are uniformly arranged between the connecting rods 1, the lower ends of the connecting rods 1 are fixed to the connecting plate through the spacers 4 and the nuts 5, and the hooks 6 are fixed to the center of the connecting plate 3.
The lower extreme of connecting rod 1 passes connecting plate 3, and is fixed with connecting plate 3 in downside threaded connection nut 5, installation gasket 4 between nut 5 and the connecting plate 3.
The diameter of the cross rod is 25mm, and the fixed thread at the lower part of the connecting rod is M30.
The connecting rod is made of 45 steel, and is subjected to thermal refining until the tensile strength Rm is more than or equal to 630MPa and the yield strength Rp0.2 is more than or equal to 370 MPa.
The gasket 4 is a sand control nylon washer, and connecting threads are arranged on the bottom end of the connecting rod 1, and connecting holes are formed in the top end of the connecting rod.
The central point of connecting plate 3 puts and sets up the fixed slot, and the upper end of lifting hook 6 passes the fixed slot and 3 joints of connecting plate.
A method for preparing a hook group for shot blasting comprises the following steps,
firstly, according to actual use conditions, the maximum lifting capacity is 3 tons, the workpiece is lifted to cause 5-degree deflection in the side pushing direction during shot blasting to carry out primary design, the diameter b of a cross rod is adjusted from phi 20 to phi 25 aiming at the strength problem, the quantity a of the cross rod is adjusted to 3 pieces, and the cross rod is welded at equal intervals;
adjusting the lower fixing thread e of the connecting rod from M20 to M30, and increasing the round angle at the transition position d to obtain r =2 mm;
then carrying out thermal refining on the connecting rod to improve the mechanical property of the connecting rod, wherein the connecting rod is made of 45 steel, and the thermal refining is carried out until the tensile strength Rm is more than or equal to 630MPa and the yield strength Rp0.2 is more than or equal to 370 MPa;
at last, the sand-prevention nylon gasket is additionally arranged at the mounting positions of the connecting rod and the connecting plate aiming at the problem that sand is easy to enter the fit clearance between the connecting plate and the connecting rod due to sand blasting.
And secondly, carrying out load analysis on the hook group and checking the strength of the hook group. According to the analysis result, the equivalent stress of the improved cross bar 2 is reduced from 296.88MPa to 134.76MPa, and the equivalent stress of the fracture position is reduced from 289.3MPa to 119.52 MPa.
And thirdly, checking the safety coefficient and the design rationality. Because the hook group is often impacted by sand blasting in the using process, the safety coefficient is checked according to the fatigue safety coefficient of the impact load, and the safety coefficient of the tensile strength is more than or equal to 3.5 [ n ≦ n%]bLess than or equal to 5.0, and the safety coefficient of yield strength is less than or equal to 2.5 [ n%]sLess than or equal to 3.5 (the mechanical design manual single file of the fatigue strength design 31-46 pages of the mechanical design manual committee). From the improved intensity analysis, [ n ] is known]b =630/134.76=4.67，[n]s=370/134.76=2.74, the safety factor is within the range, and the design is reasonable.
Finally, if the requirements cannot be met, the number of the cross bars 2 and the diameter D1 of the cross bars are increased, the diameter D2 of the threads at the position e and the fillet radius r at the position D are changed to reduce the stress level when the load is applied, the rigidity is improved, and the design requirements are met.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to further illustrate the principles of the invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention, which is intended to be protected by the appended claims. The scope of the invention is defined by the claims and their equivalents.
Claims (7)
1. The utility model provides a couple group for peening, characterized in that, includes a pair of connecting rod (1), horizontal pole (2), connecting plate (3), gasket (4), nut (5) and lifting hook (6), evenly set up three at least between connecting rod (1) horizontal pole (2), the lower extreme of connecting rod (1) passes through gasket (4) with nut (5) fixed connection board installation, fixed lifting hook (6) are put to the central point of connecting plate (3).
2. A hook set for shot peening according to claim 1, wherein the lower end of the connecting rod (1) is passed through the connecting plate (3), and the nut (5) is screwed on the lower side and fixed to the connecting plate (3), and the spacer (4) is installed between the nut (5) and the connecting plate (3).
3. The set of hooks for shot blasting according to claim 1, wherein the diameter of the cross bar is 25mm, and the fastening screw of the lower portion of the connecting rod is M30.
4. The hook group for shot blasting according to claim 1, wherein the material of the connecting rod is 45 steel, and the connecting rod is subjected to thermal refining until the tensile strength Rm is not less than 630MPa and the yield strength Rp0.2 is not less than 370 MPa.
5. The set of hooks for shot blasting according to claim 1 or 2, wherein the gasket (4) is a sand-proof nylon washer, the bottom end of the connecting rod (1) is provided with connecting threads, and the top end of the connecting rod is provided with connecting holes.
6. A hook set for shot blasting according to claim 1, wherein a fixing groove is provided at a central position of the connecting plate (3), and an upper end of the hook (6) is engaged with the connecting plate (3) through the fixing groove.
7. A method for preparing a hook group for shot blasting is characterized by comprising the following steps,
step S1, welding the workpiece at equal intervals according to the condition that the maximum lifting capacity is 3 tons, the workpiece is lifted to cause 5-degree deflection in the side pushing direction when shot blasting is carried out, the diameter b of the cross rods is 25mm, and the number of the cross rods is 3; adjusting a fixed thread e at the lower part of the connecting rod to be M30, increasing the fillet r =2mm at the transition position d of the connecting rod step, and then carrying out thermal refining on the connecting rod to improve the mechanical property of the connecting rod, wherein the connecting rod is made of 45 steel, and the thermal refining is carried out until the tensile strength Rm is more than or equal to 630MPa and the yield strength Rp0.2 is more than or equal to 370 MPa; a sand-proof nylon gasket is additionally arranged at the mounting position of the connecting rod and the connecting plate;
s2, carrying out load analysis on the hook groups, wherein the equivalent stress of the cross bar is reduced to 134.76MPa from 296.88MPa, and the equivalent stress of a fracture position is reduced to 119.52MPa from 289.3 MPa;
step S3, checking the fatigue safety coefficient according to the impact load, wherein the strength is [ n ]]b =630/134.76=4.67，[n]s =370/134.76=2.74。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111140788.2A CN113772535A (en) | 2021-09-28 | 2021-09-28 | Hook group for shot blasting and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111140788.2A CN113772535A (en) | 2021-09-28 | 2021-09-28 | Hook group for shot blasting and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113772535A true CN113772535A (en) | 2021-12-10 |
Family
ID=78853899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111140788.2A Pending CN113772535A (en) | 2021-09-28 | 2021-09-28 | Hook group for shot blasting and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113772535A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202201936U (en) * | 2011-08-19 | 2012-04-25 | 天津赛瑞机器设备有限公司 | Lifting appliance special for quenching of long stepped shaft |
| CN204751918U (en) * | 2015-06-23 | 2015-11-11 | 河南华北起重吊钩有限公司 | Light multi -functional lifting hook group |
| CN204873458U (en) * | 2015-08-10 | 2015-12-16 | 河南省矿山起重机有限公司 | European style for hoist lifting hook organize |
| CN205838342U (en) * | 2016-08-05 | 2016-12-28 | 河南省发达起重机有限公司 | A kind of New insulated suspension hook |
| CN207551732U (en) * | 2017-11-28 | 2018-06-29 | 四环锌锗科技股份有限公司 | A kind of lifting insulation suspension hook |
| CN207858742U (en) * | 2017-12-20 | 2018-09-14 | 大连冶金轴承股份有限公司 | A kind of taper roll bearing dismantling device |
| CN208580000U (en) * | 2018-08-13 | 2019-03-05 | 安徽金星预应力工程技术有限公司 | A kind of rail clip nylon part impact tester |
| CN210150584U (en) * | 2019-04-18 | 2020-03-17 | 中建八局第四建设有限公司 | A hoisting vibration damping and isolation device |
-
2021
- 2021-09-28 CN CN202111140788.2A patent/CN113772535A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202201936U (en) * | 2011-08-19 | 2012-04-25 | 天津赛瑞机器设备有限公司 | Lifting appliance special for quenching of long stepped shaft |
| CN204751918U (en) * | 2015-06-23 | 2015-11-11 | 河南华北起重吊钩有限公司 | Light multi -functional lifting hook group |
| CN204873458U (en) * | 2015-08-10 | 2015-12-16 | 河南省矿山起重机有限公司 | European style for hoist lifting hook organize |
| CN205838342U (en) * | 2016-08-05 | 2016-12-28 | 河南省发达起重机有限公司 | A kind of New insulated suspension hook |
| CN207551732U (en) * | 2017-11-28 | 2018-06-29 | 四环锌锗科技股份有限公司 | A kind of lifting insulation suspension hook |
| CN207858742U (en) * | 2017-12-20 | 2018-09-14 | 大连冶金轴承股份有限公司 | A kind of taper roll bearing dismantling device |
| CN208580000U (en) * | 2018-08-13 | 2019-03-05 | 安徽金星预应力工程技术有限公司 | A kind of rail clip nylon part impact tester |
| CN210150584U (en) * | 2019-04-18 | 2020-03-17 | 中建八局第四建设有限公司 | A hoisting vibration damping and isolation device |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211210 |
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| RJ01 | Rejection of invention patent application after publication |