CN113043186A - Positioning pin - Google Patents
Positioning pin Download PDFInfo
- Publication number
- CN113043186A CN113043186A CN201911363198.9A CN201911363198A CN113043186A CN 113043186 A CN113043186 A CN 113043186A CN 201911363198 A CN201911363198 A CN 201911363198A CN 113043186 A CN113043186 A CN 113043186A
- Authority
- CN
- China
- Prior art keywords
- positioning
- pin
- arc section
- elastic
- elastic steel
- 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
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 229910000639 Spring steel Inorganic materials 0.000 claims description 4
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
-
- 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
- F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
- F16B19/02—Bolts or sleeves for positioning of machine parts, e.g. notched taper pins, fitting pins, sleeves, eccentric positioning rings
Abstract
A locating pin comprises a pin body, wherein the pin body comprises a cylindrical rod and an elastic locating part, and the elastic locating part comprises a disc and a plurality of elastic steel sheets annularly distributed on a connecting line of the disc and the circle center of the upper end surface of the cylindrical rod; the elastic steel sheets consist of an upper arc section and a lower arc section connected to the lower part of the upper arc section, a groove is formed between every two adjacent elastic steel sheets, the end part of the upper arc section of each elastic steel sheet is connected with the periphery of the disc to form a spherical shell, the end part of the lower arc section of each elastic steel sheet is connected with the periphery of the upper end face of the cylindrical rod to form a cylinder, and the lower end of the spherical shell is communicated with the upper end of the cylinder. The positioning pin and the hole diameter of the part matched with the positioning pin are not in clearance, and the over-positioning problem is solved by using two elastic positioning pins; the requirement for the position size between the two positioning pins is reduced to a certain extent.
Description
Technical Field
The invention relates to a positioning pin.
Background
The locating pin is used for processing or checking fixture location. One side of one pin is limited by 5 degrees of freedom, only one degree of freedom rotating around the pin is not limited, and if the second pin is still a round pin, the distance between the two pins is fixed, the degree of freedom in the connecting line direction of the two pins is limited more at one time, and over-positioning is formed. After the second pin is changed into the diamond pin, the degree of freedom of angular rotation is limited, and the 6-point positioning principle is met. The diameter of the positioning pin is smaller than the diameter of the hole of the part matched with the positioning pin; especially when two positioning pins exist, one positioning pin must be designed into a diamond shape, and the positioning pin and a part inevitably have a gap. Because there is the clearance between locating pin and the part, make the part after the assembly, the part can move around the locating pin to cause the reduction of processing product precision or examine the utensil and cause the erroneous judgement for the product. When two locating pins exist, the position size requirements of the two locating pins are very high, otherwise, parts cannot be mounted on the tool or the checking fixture.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a positioning pin, wherein no gap exists between the positioning pin and the hole diameter of a part matched with the positioning pin, and the over-positioning problem is solved by two elastic positioning pins; the requirement for the position size between the two positioning pins is reduced to a certain extent.
The technical scheme of the invention is as follows: the pin comprises a pin body, wherein the pin body comprises a cylindrical rod and an elastic positioning part, and the elastic positioning part comprises a disc and a plurality of elastic steel sheets annularly distributed on a circle center connecting line of the disc and the upper end surface of the cylindrical rod; the elastic steel sheets consist of an upper arc section and a lower arc section connected to the lower part of the upper arc section, a groove is formed between every two adjacent elastic steel sheets, the end part of the upper arc section of each elastic steel sheet is connected with the periphery of the disc to form a spherical shell, the end part of the lower arc section of each elastic steel sheet is connected with the periphery of the upper end face of the cylindrical rod to form a cylinder, and the lower end of the spherical shell is communicated with the upper end of the cylinder.
The spherical shell is an ellipsoid shell.
The upper arc section and the lower arc section of the elastic steel sheet are integrally formed.
The elastic steel sheet is made of spring steel.
The diameter phi D of the disc is smaller than the positioning hole phi D1 of the part, and the maximum diameter phi D of the spherical shell is larger than the positioning hole phi D1 of the part.
The length of the cylindrical rod is greater than that of the cylinder.
When an existing part is designed, due to the fact that the position requirement is higher and higher, when the part is machined and detected by a detection tool, the position of a positioning pin and the gap between the positioning pin and a positioning hole of the part are higher and higher, and even the gap is not allowed. Therefore, the requirements on the design and manufacture of the tool and the check tool are higher and higher, and the cost is higher and higher. The positioning part of the positioning pin adopts the thin shell and the groove, so that the positioning part of the positioning pin can be easily compressed and restored, the positioning pin solves the problem that a gap exists between the positioning pin and a positioning hole of a part, and the problem that the position requirement between two positioning pins is high is solved. When the part is installed, the part compresses the positioning pin, and the positioning pin is inwards compressed due to the fact that the positioning pin is provided with the plurality of grooves. When the part is taken out, the positioning pin automatically expands, the elasticity of the spring steel is large, and the service life is long. The locating pin solves the problem of over-locating because the cylindrical pin has deviation towards the inner diameter direction in all directions, and prevents the problem that the over-locating can not lead the parts to be assembled.
Drawings
FIG. 1 is a schematic view of the construction of the locating pin of the present invention in use;
FIG. 2 is a front view of the locating pin;
FIG. 3 is a cross-sectional view of FIG. 2;
FIG. 4 is a top view of FIG. 2;
in the figure, 1 is a bottom plate, 2 is a positioning pin, 3 is a part, phiD is the maximum diameter of the positioning part of the positioning pin 2, phid is the diameter of the top end of the positioning part of the positioning pin 2 and is the diameter of the positioning hole of the part 3, L is the matching length of the positioning pin 2 and the bottom plate 1, and L is the length of a hollow shell formed in the matching of the positioning pin 2 and the fixed plate 1.
Detailed Description
In fig. 1, the elastic positioning portion of the positioning pin 2 is formed in a thin shell shape, the positioning pin 2 is attached to the base plate 1, and the component 3 is attached to the positioning pin 2.
In fig. 2, the upper part of the elastic positioning part of the positioning pin 2 is a spherical shell with a large middle and small two ends, so that the positioning pin can be easily compressed and restored. The diameter phid of the top end disc of the elastic positioning part of the positioning pin 2 is smaller than the diameter phiD 1 of the positioning hole of the part 3, so that the positioning pin 2 can be conveniently arranged in the positioning hole of the part 3. The maximum diameter phid of the positioning portion of the positioning pin 2 is larger than the positioning hole diameter phid 1 of the part 3 and can be easily compressed inward to be smaller than the positioning hole diameter phid 1 of the part 3, so that the positioning portion of the positioning pin 2 and the positioning hole of the part 3 are fitted without a gap. The material of the elastic positioning portion of the positioning pin 2 is spring steel, and heat treatment is performed after the positioning pin 2 is manufactured, so that the maximum diameter phid of the positioning portion of the positioning pin 2 can be compressed and restored, so that the positioning pin 2 can be fitted with the positioning hole of the part 3 without a clearance. The positioning pin 2 is arranged in the length L of the bottom plate 1, a part of the L is also in a thin shell shape, the length of the L is about 1/3 of the L under the condition of ensuring the strength, and the thickness of the thin shell is as thin as possible so as to be easy to compress.
In fig. 3 and 4, under the condition of ensuring the strength of the positioning pin 2, the positions of the thin shells in the positioning pin 2 are uniformly distributed with grooves, the number of the grooves is as large as possible, and the groove width a is determined according to actual conditions so as to be easily compressed or restored.
Claims (6)
1. A locating pin, its characterized in that: the pin comprises a pin body, wherein the pin body comprises a cylindrical rod and an elastic positioning part, and the elastic positioning part comprises a disc and a plurality of elastic steel sheets annularly distributed on a circle center connecting line of the disc and the upper end surface of the cylindrical rod; the elastic steel sheets consist of an upper arc section and a lower arc section connected to the lower part of the upper arc section, a groove is formed between every two adjacent elastic steel sheets, the end part of the upper arc section of each elastic steel sheet is connected with the periphery of the disc to form a spherical shell, the end part of the lower arc section of each elastic steel sheet is connected with the periphery of the upper end face of the cylindrical rod to form a cylinder, and the lower end of the spherical shell is communicated with the upper end of the cylinder.
2. The locating pin of claim 1, wherein: the spherical shell is an ellipsoid shell.
3. The locating pin of claim 1, wherein: the upper arc section and the lower arc section of the elastic steel sheet are integrally formed.
4. The locating pin of claim 1, wherein: the elastic steel sheet is made of spring steel.
5. The locating pin of claim 1, wherein: the diameter phid of the disc is smaller than the positioning hole phiD 1 of the part 3, and the maximum diameter phiD of the spherical shell is larger than the positioning hole phiD 1 of the part.
6. The locating pin of claim 1, wherein: the length of the cylindrical rod is greater than that of the cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911363198.9A CN113043186A (en) | 2019-12-26 | 2019-12-26 | Positioning pin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911363198.9A CN113043186A (en) | 2019-12-26 | 2019-12-26 | Positioning pin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113043186A true CN113043186A (en) | 2021-06-29 |
Family
ID=76505271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911363198.9A Pending CN113043186A (en) | 2019-12-26 | 2019-12-26 | Positioning pin |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113043186A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114278655A (en) * | 2021-12-30 | 2022-04-05 | 内蒙古北方重工业集团有限公司 | Over-positioning automatic compensation positioning pin |
-
2019
- 2019-12-26 CN CN201911363198.9A patent/CN113043186A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114278655A (en) * | 2021-12-30 | 2022-04-05 | 内蒙古北方重工业集团有限公司 | Over-positioning automatic compensation positioning pin |
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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 |