CN112412944A - Method for installing and checking high-strength bolt - Google Patents
Method for installing and checking high-strength bolt Download PDFInfo
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- CN112412944A CN112412944A CN202011298752.2A CN202011298752A CN112412944A CN 112412944 A CN112412944 A CN 112412944A CN 202011298752 A CN202011298752 A CN 202011298752A CN 112412944 A CN112412944 A CN 112412944A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000007689 inspection Methods 0.000 claims abstract description 32
- 239000003973 paint Substances 0.000 claims abstract description 17
- 238000004080 punching Methods 0.000 claims abstract description 13
- 238000009434 installation Methods 0.000 claims description 16
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- 229920000742 Cotton Polymers 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention relates to a method for installing and checking a high-strength bolt, which comprises the following steps of I, abutting splicing plates against each other, accurately aligning a plate bundle with a hole by using a punching nail, and then inserting a tool bolt into the hole of the splicing plates to fully compress the splicing plates; sleeving a gasket on the bolt, and then inserting the splice plate; using a sleeve spanner for initial screwing, and using a white paint pen as a marking point on the plane of the end head of the bolt; performing initial screwing inspection on all the high bolts, and after the initial screwing is qualified, marking the high bolts by using a white paint pen, wherein the marking lines are continuous and in a straight line; step V, a high-strength bolt is finally twisted by an electric wrench, and after the final twisting is finished, a red paint pen is used for drawing a final twisting line on one side of the identification point; and VI, after final screwing, performing fastening inspection by using a portable torque tester, and after the final screwing inspection is qualified, drawing a qualified line on the other side of the identification point by using a red paint pen.
Description
Technical Field
The invention relates to the technical field of steel member connection, in particular to a method for installing and checking a high-strength bolt.
Background
The high-strength bolt is a very important component in engineering projects, and key factors for controlling the reliability of high-bolt connection mainly have two major aspects: the pretension force of the bolt is the one, and the friction coefficient of the connecting plate surface is the other; the force transmission mechanism of the high-strength bolt is that a bolt rod generates a large pretension force by screwing a nut, so that a strong friction force is generated between plate bundles to realize the transmission of force in a component, the traditional high-strength bolt has high installation error rate, and the situations of missing screwing, repeated final screwing, over screwing and the like frequently occur, so that an intuitive and efficient high-strength bolt installation and inspection method is urgently needed.
Therefore, in view of the above disadvantages, it is desirable to provide a method for mounting and inspecting a high-strength bolt.
Disclosure of Invention
Technical problem to be solved
The invention aims to solve the technical problem of high installation error rate of the traditional high-strength bolt.
(II) technical scheme
In order to solve the above technical problems, the present invention provides a method for installing and inspecting a high-strength bolt, comprising the steps of,
I. abutting the splice plates, accurately aligning the plate bundles by using punching nails, and then inserting tool bolts into the holes of the splice plates to fully compress the splice plates;
sleeving a washer on the bolt, enabling the washer to be abutted against the nut, then inserting the bolt into all the rest mounting holes of the splice plate, sleeving the washer on one end of the bolt extending out of the splice plate, enabling the washer to be abutted against the splice plate, and then screwing the nut onto the bolt by hand;
using a socket wrench for initial screwing to enable the nut to be abutted against the washer, and then using a white paint pen as a marking point on the plane of the end head of the bolt;
after the initial screwing is finished, performing initial screwing inspection on all the high bolts by adopting a knocking method, after the initial screwing is qualified, making a marking line on the initially screwed high bolts by using a white paint pen, wherein the marking line is formed by a splice plate, a washer, a nut and a bolt in one stroke, and the marking line is continuous and in a straight line;
after the initial screwing is finished on the same day, the high-strength bolt is finally screwed by the electric wrench on the same day, and after the final screwing is finished, a final screwing line is drawn on the bolt plane on one side of the identification point by a red paint pen;
and VI, after final screwing, performing fastening inspection by using a portable torque tester, reading a torque value when the instrument rings in the uniform applied torque, comparing the torque value with a specified value, judging that the over-screwing value and the under-screwing value are not more than 10% of the specified value to be qualified, and after the final screwing inspection is qualified, drawing a qualified line on the bolt plane on the other side of the identification point by using a red paint pen to complete the installation and inspection of the high-strength bolt.
Through the technical scheme. The high bolt is simple and reliable to install, and time is saved. The inspection of the high bolt is quicker and more visual, and the conditions of missing screwing, over screwing and repeated final screwing are effectively avoided. The economic loss caused by replacing the high bolt due to the installation error of the high bolt is reduced. The safety and the stability of the connecting piece are enhanced to a certain extent, and the engineering quality is improved.
As a further explanation of the invention, before the assembled plate is installed, the dirt on the plate surface and in the bolt holes is preferably removed by using a thin copper wire brush and a clean cotton cloth, and the part with the dirt is dipped in acetone and cleaned by using the clean cotton cloth.
Through adopting above-mentioned technical scheme, avoid external factor to influence the accurate installation of high strength bolt, guarantee to laminate steadily completely between the makeup board.
As a further explanation of the present invention, it is preferable that the inserted punching nails should be arranged at intervals of a quincunx shape, and the tool bolts should be installed around the splice plates and at the position of the splice seam.
Through adopting above-mentioned technical scheme to accurate alignment connecting elements to guarantee to fully compress tightly the sheet layer, and then can make follow-up high strength bolt's installation not only laborsaving but also can stably fix the splice plate.
As a further illustration of the invention, the bolts are preferably screwed together in a symmetrical manner from the middle to the two sides and from the middle to the sides.
Through adopting above-mentioned technical scheme, guarantee to press gradually the splice plate closely and flatten to make the connection of follow-up high strength bolt butt splice plate more firm.
As a further explanation of the present invention, it is preferable that the striking method is to strike one side of the nut with a 0.3kg hammer and press the opposite side of the nut with a hand, and if the vibration is large, the nut is not qualified, and the nut should be screwed again, and conversely, the nut is qualified.
Through adopting above-mentioned technical scheme, the detection mode is simple easy to operate, and enables constructor more audio-visual impression nut elasticity, improves the degree of accuracy and the efficiency that detect.
As a further explanation of the invention, preferably the marking lines have to be drawn on the angular edges of the nut.
Through adopting above-mentioned technical scheme to accurately judge the rotating position of nut, if appear leaking to twist, the packing ring rotates or other problems all can pass through white marking line quick check.
As a further explanation of the present invention, it is preferable that the electric wrench is preheated for 3 to 5 minutes before use.
Through adopting above-mentioned technical scheme to stabilize electric spanner's torque, make electric spanner can stabilize the rotating nut, guarantee that high strength bolt's installation is stable.
As a further explanation of the present invention, it is preferable that the final screwing check is performed within 24 hours after the final screwing for 4 hours, and the misalignment of the white marking marks on the splice plate, the bolt, the washer, and the nut after the final screwing is checked.
Through adopting above-mentioned technical scheme to excessive laxity of nut and influence the final inspection result to the nut is avoided.
As a further explanation of the present invention, it is preferable that the underscrewing failed is repaired and the overscrewing failed is replaced by the high bolt for the next screwing at the time of the final screwing inspection.
Through adopting above-mentioned technical scheme, guarantee that each high strength bolt homoenergetic fastens, and then guarantee that the splice plate connects firmly.
As a further explanation of the present invention, it is preferable that the percentage of the final screwing inspection is 20%, and when the fraction defective exceeds 20%, the spot check should be continued until the yield is more than 80% of the total cumulative number.
By adopting the technical scheme, the connection between the splice plates can be further ensured to be stable, and the construction safety is improved.
(III) advantageous effects
The technical scheme of the invention has the following advantages:
the invention can avoid the situations of missing twisting, over twisting and repeated final twisting by marking through the paint pen during the initial twisting, the initial twisting inspection, the final twisting and the final twisting inspection; the marking lines are combined by the splicing plates, the gaskets, the nuts and the bolts, the marking lines are continuous and in a straight line, the edges and corners of the nuts are marked, the white marking lines can generate obvious staggered layers after final screwing is finished, if screwing is missed, the rotation of the gaskets or other problems can be quickly checked through the white marking lines, and the problems in installation can be solved more quickly.
Drawings
FIG. 1 is a partial installation structure of the splice bar of the present invention;
FIG. 2 is a partial installed rear view of the splice bar of the present invention;
FIG. 3 is a cross-sectional view of the splice plate installation of the present invention.
In the figure: 1. splicing plates; 2. a bolt; 21. a nut; 3. a gasket; 31. chamfering; 4. a nut; 5. identifying a point; 6. marking a line; 7. final twisting; 8. and (4) passing through a qualified line.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
A method for installing and inspecting a high-strength bolt, which combines fig. 1, 2 and 3, and comprises the following steps:
I. before the assembling plates 1 are installed, dirt on the plate surface and in the bolt holes is removed through a thin copper wire brush and a clean cotton cloth, the positions stained with the dirt are dipped in acetone through the clean cotton cloth and cleaned, the high-strength bolts are prevented from being accurately installed due to the influence of external factors, and the assembling plates 1 can be completely and stably attached; (the splice plate 1 of the invention is provided with a plurality of round holes which are distributed in an array at intervals);
abutting the splice plates 1, accurately aligning the plate bundles by using punching nails, and arranging the penetrating punching nails at intervals according to a quincunx so as to accurately align the connecting components; the punching nails are complete steel nails, and the diameters of the punching nails are strictly selected according to technical rules of construction of bridge and culvert engineering of the passenger and cargo collinear railways (Q/CR9652-2017) (the diameters of the punching nails are smaller than the designed apertures by 0.1-0.3 mm); reuse tool bolt inserts the downthehole of splice plate, make fully compress tightly between the splice plate, wherein tool bolt is ordinary bolt, tool bolt should install all around and the piece position in splice plate, tool bolt is the whole according to from the centre to both sides, from the well row to the side row upper and lower floor symmetry principle of twisting, guarantee to be able to step by step the compact flattening of splice plate 1 to make 2 connections of follow-up high strength bolt 1 more firm, and then can make 2 installations of follow-up high strength bolt not only laborsaving but also can stabilize fixed splice plate 1.
Sleeving a washer 3 on a bolt 2, enabling the washer 3 to abut against a nut 21, then inserting the bolt 2 into all the rest mounting holes of the splice plate 1, sleeving the washer 3 on one end, extending out of the splice plate 1, of the bolt 2, enabling the washer 3 to abut against the splice plate 1, enabling one side of a chamfer 31 in the washer 3 to face a bearing surface of the nut 21 and a bearing surface of the nut 4 respectively, and then screwing the nut 4 onto the bolt 2 by hand;
IV, performing initial screwing by using a sleeve spanner to enable the nut 4 to be abutted against the washer 3, then using a white paint pen as a marking point 5 on the plane of the end head of the bolt 2, and setting the initial screwing to clamp the plate bundle so as to enable the plate bundle to be in an elastic working state, thereby avoiding the problem of pretension loss caused by loosening of the first screwed bolt due to the later screwed bolt;
then pushing out the punching nails twice, firstly pushing out two thirds of the punching nails, penetrating into the high bolts, generally screwing the high bolts by using a socket spanner, and then pushing out the rest punching nails to install the high bolts;
after the initial screwing is finished, performing initial screwing inspection on all high bolts by adopting a knocking method, wherein the knocking method comprises the steps of knocking one side of a nut 4 by using a 0.3kg small hammer, pressing the opposite side of the nut 4 by a hand, if the opposite side is unqualified due to larger vibration, performing screwing, and if the opposite side is qualified, the detecting method is simple and easy to operate, and can enable constructors to feel the tightness of the nut 4 more intuitively, so that the detecting accuracy and efficiency are improved; after the initial screwing is qualified, a white paint pen is used for making a marking line 6 for the initially screwed high bolt, the marking line 6 is formed by one stroke of a splice plate 1, a gasket 3, a nut 4 and a bolt 2, the marking lines are continuous and in a straight line, the marking line 6 must be drawn on the edge and corner edge of the nut 4 so as to accurately judge the rotating position of the nut 4, and if the screwing is missed, the rotation of the gasket 3 or other problems occur, the quick inspection can be carried out through the white marking line 6;
VI, after the initial screwing is completed in the same day, the high-strength bolt 2 is finally screwed by the electric wrench in the same day, and the electric wrench needs to be preheated for 3-5 minutes before being used so as to stabilize the torque of the electric wrench, so that the electric wrench can stably rotate the nut 4, the stable installation of the high-strength bolt 2 is ensured, and the process of screwing the torque is continuous, stable and uniform; after the final screwing is finished, drawing a final screwing line 7 on the plane of the bolt 2 on one side of the identification point 5 by using a red paint pen;
after final screwing, final screwing inspection needs to be carried out within 24 hours after 4 hours of final screwing, and the staggering condition of white marking marks on the splice plate 1, the bolt 2, the washer 3 and the nut 4 after final screwing is firstly inspected so as to prevent the nut 4 from being excessively loosened to influence the final inspection result of the nut 4; the final screwing inspection is carried out by adopting a portable torque tester, the torque value when the instrument makes a sound in the uniformly applied torque is read and compared with a specified value, the condition that the overthreading value and the under-screwing value are not more than 10% of the specified value is qualified, the proportion of the final screwing inspection is 20%, when the failure rate exceeds 20%, the final screwing inspection is continuously carried out until the qualification rate is more than 80% of the total accumulated rate, the connection between the splice plates 1 is further ensured to be stable, and the construction safety is improved; and after the final screwing inspection is qualified, drawing a qualified line 8 on the plane of the bolt 2 on the other side of the identification point 5 by using a red paint pen, and finishing the installation and inspection of the high-strength bolt 2.
Through the technical scheme. The high bolt is simple and reliable to install, and time is saved. The inspection of the high bolt is quicker and more visual, and the conditions of missing screwing, over screwing and repeated final screwing are effectively avoided. The economic loss caused by replacing the high bolt due to the installation error of the high bolt is reduced. The safety and the stability of the connecting piece are enhanced to a certain extent, and the engineering quality is improved. And meanwhile, during final screwing inspection, the unqualified underscrewed bolts are subjected to additional screwing, the unqualified overscrewed bolts are subjected to high bolt replacement and are screwed again, and all high-strength bolts can be fastened, so that the splicing plates are ensured to be connected stably.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for installing and checking a high-strength bolt is characterized in that: comprises the following steps of (a) carrying out,
i, abutting the splice plates (1) against each other, accurately aligning the plate bundle with a hole by using a punching nail, and then inserting a tool bolt into the hole of the splice plates (1) to fully compress the splice plates (1);
II, sleeving a gasket (3) on the bolt (2), enabling the gasket (3) to be abutted against a nut (21), then inserting the bolt (2) into all the rest mounting holes of the splice plate (1), sleeving the gasket (3) on one end, extending out of the splice plate (1), of the bolt (2), enabling the gasket (3) to be abutted against the splice plate (1), and then screwing the nut (4) onto the bolt (2) by hand;
using a socket wrench to perform initial screwing to enable the nut (4) to be abutted against the washer (3), and then using a white paint pen as a marking point (5) on the plane of the end of the bolt (2);
after the initial screwing is finished, performing initial screwing inspection on all the high bolts by adopting a knocking method, after the initial screwing is qualified, making a marking line (7) on the initially screwed high bolts by using a white paint pen, wherein the marking line (7) is synthesized by one stroke of the splice plate (1), the gasket (3), the nut (4) and the bolt (2), and the marking line is continuous and in a straight line;
after the initial screwing is finished on the same day, the high-strength bolt is finally screwed by the electric wrench on the same day, and after the final screwing is finished, a final screwing line (7) is drawn on the plane of the bolt (2) on one side of the identification point (5) by a red paint pen;
and VI, after final screwing, performing fastening inspection by using a portable torque tester, reading a torque value when the instrument rings in the uniform applied torque, comparing the torque value with a specified value, judging that the overthreading value and the underwrong value are not more than 10% of the specified value to be qualified, and after the final screwing inspection is qualified, drawing a qualified line (8) on the plane of the bolt (2) on the other side of the identification point (5) by using a red paint pen to complete the installation and inspection of the high-strength bolt.
2. The method for installing and inspecting a high-strength bolt according to claim 1, wherein: before the assembled plate (1) is installed, dirt on the plate surface and in the bolt hole is removed through a thin copper wire brush and a clean cotton cloth, and the clean cotton cloth is dipped in acetone and cleaned in the oil dirt-stained position.
3. The method for installing and inspecting a high-strength bolt according to claim 1, wherein: the penetrating punching nails are arranged at intervals in a quincunx shape, and tool bolts are arranged on the periphery and the abutted seam position of the splice plate (1).
4. The method for installing and inspecting a high-strength bolt according to claim 1, wherein: the bolts (2) are symmetrically screwed from the middle to the two sides and from the middle to the upper layer and the lower layer.
5. The method for installing and inspecting a high-strength bolt according to claim 1, wherein: the striking method is characterized in that a 0.3kg hammer is used for striking one side of the nut (4), the opposite side of the nut (4) is pressed by a hand, if the vibration is larger, the nut is unqualified, the nut is screwed, and otherwise, the nut is qualified.
6. The method for installing and inspecting a high-strength bolt according to claim 1, wherein: the marking line (6) must be drawn on the edge of the nut (4).
7. The method for installing and inspecting a high-strength bolt according to claim 1, wherein: the electric wrench needs to be preheated for 3-5 minutes before being used.
8. The method for installing and inspecting a high-strength bolt according to claim 1, wherein: and the final screwing inspection needs to be carried out within 24 hours after the final screwing is carried out for 4 hours, and the staggering condition of the white marking marks on the splice plate (1), the bolt (2), the washer (3) and the nut (4) after the final screwing is firstly inspected.
9. The method for installing and inspecting a high-strength bolt according to claim 8, wherein: and during final screwing inspection, the unqualified under-screwing is subjected to additional screwing, and the unqualified over-screwing is subjected to re-screwing by replacing the high bolt.
10. The method for installing and inspecting a high-strength bolt according to claim 9, wherein: the percentage of the final screwing inspection is 20%, when the reject ratio exceeds 20%, the spot check is continued until the pass ratio is more than 80% of the total accumulated amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011298752.2A CN112412944B (en) | 2020-11-18 | 2020-11-18 | Method for installing and checking high-strength bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011298752.2A CN112412944B (en) | 2020-11-18 | 2020-11-18 | Method for installing and checking high-strength bolt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112412944A true CN112412944A (en) | 2021-02-26 |
| CN112412944B CN112412944B (en) | 2022-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011298752.2A Active CN112412944B (en) | 2020-11-18 | 2020-11-18 | Method for installing and checking high-strength bolt |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009210276A (en) * | 2008-02-29 | 2009-09-17 | Mitsubishi Heavy Ind Ltd | System and method for detecting loosening of fastening implement |
| CN201503254U (en) * | 2009-09-30 | 2010-06-09 | 江苏中泰钢结构股份有限公司 | High-strength bolt screwing inspection ring |
| CN103317477A (en) * | 2013-06-18 | 2013-09-25 | 利丰海洋工程（深圳）有限公司 | Angle anchoring bolt tightening method and tightening device |
| CN203730521U (en) * | 2014-02-16 | 2014-07-23 | 中化二建集团有限公司 | Steel structure engineering high-strength bolt |
| CN104680517A (en) * | 2015-01-22 | 2015-06-03 | 清华大学 | Looseness detection method of bolt |
| CN105628360A (en) * | 2015-12-29 | 2016-06-01 | 内蒙古包钢钢联股份有限公司 | Method for rapidly determining bolt loosening |
| CN205940407U (en) * | 2016-07-28 | 2017-02-08 | 潍柴动力股份有限公司 | Bolt corner indicating device |
-
2020
- 2020-11-18 CN CN202011298752.2A patent/CN112412944B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009210276A (en) * | 2008-02-29 | 2009-09-17 | Mitsubishi Heavy Ind Ltd | System and method for detecting loosening of fastening implement |
| CN201503254U (en) * | 2009-09-30 | 2010-06-09 | 江苏中泰钢结构股份有限公司 | High-strength bolt screwing inspection ring |
| CN103317477A (en) * | 2013-06-18 | 2013-09-25 | 利丰海洋工程（深圳）有限公司 | Angle anchoring bolt tightening method and tightening device |
| CN203730521U (en) * | 2014-02-16 | 2014-07-23 | 中化二建集团有限公司 | Steel structure engineering high-strength bolt |
| CN104680517A (en) * | 2015-01-22 | 2015-06-03 | 清华大学 | Looseness detection method of bolt |
| CN105628360A (en) * | 2015-12-29 | 2016-06-01 | 内蒙古包钢钢联股份有限公司 | Method for rapidly determining bolt loosening |
| CN205940407U (en) * | 2016-07-28 | 2017-02-08 | 潍柴动力股份有限公司 | Bolt corner indicating device |
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| Publication number | Publication date |
|---|---|
| CN112412944B (en) | 2022-07-15 |
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