Pin type positioning structure applied to measurement and measurement system

Abstract

The utility model discloses a pin type positioning structure applied to measurement and a measurement system. The pin type positioning structure comprises a first positioning hole and a second positioning hole, a reference surface fixed relative to the measurement device; the reference positioning pin is fixed on the reference surface and is inserted into the first positioning hole to determine a reference point; the floating connection structure is arranged on the reference surface; the floating positioning pin is movably connected with the reference surface through a floating connecting structure, the axes of the reference positioning pin and the floating positioning pin are located on the same plane, and the plane is an angular positioning surface; the reference positioning pin is located in the first positioning hole, in the process that the floating positioning pin is inserted into the second positioning hole, the position of the axis of the floating positioning pin in the angular positioning face is changed along with the position of the second positioning hole, the first positioning hole and the second positioning hole are connected with the reference positioning pin and the floating positioning pin in an inserted mode respectively, and a workpiece is positioned after making contact with the reference surface. When the difference between the linear expansion coefficient of the workpiece to be measured and the linear expansion coefficient of the positioning platform is large, the measuring system can adapt to accurate positioning of the workpiece at different temperatures.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of measurement technology especially a pin type positioning structure and measurement system for measurement. BACKGROUND

[0002] The positioning structure of the measuring device usually contains a reference plane, and two positioning pins are fixed on the reference plane: a round pin and a rhombic pin, which correspond to two positioning holes on the workpiece to be measured. When positioning, the round pin realizes reference positioning by cooperating with a positioning hole, and the rhombic pin cooperates with another hole to control the angular position of the workpiece relative to the round pin. The cross-sectional dimension of the rhombic pin is slightly smaller than the diameter of the corresponding positioning hole. This design can be compatible with the hole distance deviation and diameter deviation of the two positioning holes, thereby ensuring that the measurement error is within the allowable range.

[0003] The tolerance measurement standard is usually based on room temperature (20℃). When the workpiece to be measured and the material of the positioning platform of the measuring device are the same, or the difference in linear expansion coefficient between the two is small, the above positioning method can meet the measurement accuracy requirement. However, if the difference in linear expansion coefficient between the two is large (for example, the positioning platform is made of steel and the workpiece to be measured is made of aluminum), thermal deformation will cause the rhombic pin to deviate from the positioning hole, which may scratch the workpiece due to forced insertion. SUMMARY

[0004] In view of the above-mentioned shortcomings in the prior art, the present application provides a pin type positioning structure and measurement system for measurement, so that the measurement system can accurately position the workpiece at different temperatures when the linear expansion coefficient of the workpiece to be measured and the linear expansion coefficient of the positioning platform are significantly different.

[0005] The technical solutions adopted by the utility model are as follows:

[0006] A pin type positioning structure for measurement, comprising a first positioning hole and a second positioning hole on a workpiece to be measured, further comprising:

[0007] a reference surface, fixedly arranged relative to a measuring device;

[0008] a reference positioning pin, fixedly arranged on the reference surface, used for inserting into the first positioning hole to determine the reference point when the workpiece is positioned;

[0009] a floating connection structure, arranged on the reference surface;

[0010] a floating positioning pin, which is movably connected to the reference surface through the floating connection structure, and the axis of the reference positioning pin and the floating positioning pin is located in the same plane, which is an angular positioning plane;

[0011] The reference positioning pin is located in the first positioning hole, the floating positioning pin is inserted into the second positioning hole, and the axis of the floating positioning pin changes the position in the angular positioning surface with the position of the second positioning hole. After the first positioning hole and the reference positioning pin are inserted, the second positioning hole and the floating positioning pin are inserted, and the workpiece and the reference surface are in contact, the workpiece is positioned.

[0012] As a further improvement of the above technical solution:

[0013] The floating positioning pin comprises a first connecting column and a first guide portion at the end of the first connecting column, and the first guide portion is a tapered surface or a spherical surface matched with the diameter of the second positioning hole;

[0014] The floating connection structure comprises a sliding seat in sliding connection with the reference surface, and the first connecting column is fixedly arranged on the sliding seat. The sliding direction of the sliding seat is the center line direction of the reference positioning pin and the floating positioning pin.

[0015] The reference surface is located on the surface of the base body, and the floating connection structure further comprises a through hole penetrating through the base body. Limiting bosses are arranged on both sides of the through hole. The sliding seat is located in the through hole, and a limiting wing plate corresponding to the limiting boss is arranged on the sliding seat. A bottom plate is fixedly installed at the bottom of the through hole, and a sliding groove matched with the limiting wing plate is formed between the bottom plate and the limiting boss, so that the reference surface and the sliding seat are in sliding connection.

[0016] The sliding seat and the bottom plate are provided with a sliding pad in sliding connection with the sliding seat.

[0017] The sliding pad comprises a pad plate and a plurality of rolling balls rotatably installed on the pad plate, and the plurality of rolling balls are in sliding connection with the sliding seat.

[0018] The cross section of the first connecting column is rhombic, and the structural size of the rhombic shape is smaller than the cross section size of the second positioning hole. The projection shape of the first guide portion on the reference surface is the same as the rhombic shape.

[0019] The floating positioning pin comprises a first connecting column and a first guide portion at the end of the first connecting column, and the first guide portion is a spherical surface matched with the diameter of the first positioning hole;

[0020] The reference surface is located on the base surface, the floating connection structure comprises a guide hole penetrating the reference surface, the first connecting column is hinged to the base, the first guide part is located outside the guide hole, the width direction side wall of the guide hole is in contact with both sides of the first connecting column for limiting the axis of the first connecting column to be located on the angular positioning surface, and the length direction side wall of the guide hole corresponds to the other two sides of the first connecting column for limiting the swing amplitude of the first connecting column.

[0021] The guide hole is a through hole penetrating the base, and the floating connection structure further comprises a hinge seat, the first connecting column is hingedly arranged on the hinge seat, and the hinge seat is detachably fixedly connected with the base.

[0022] The reference positioning pin comprises a second connecting column fixedly connected with the reference surface, and a second guide part is arranged at the upper end of the second connecting column, wherein the second guide part is a conical surface or a spherical surface matched with the diameter of the first positioning hole.

[0023] A measurement system comprises the pin positioning structure applied to measurement.

[0024] The utility model discloses the beneficial effects are as follows:

[0025] The utility model discloses compact, reasonable, convenient operation, through the reference positioning pin fixed setting on the reference surface, as the reference point when the workpiece positioning, the floating positioning pin activity setting is in the reference surface, guarantees the axis of two positioning pins to be located on the same plane makes the floating positioning pin with the second positioning hole's plug -in and determine the angular orientation of workpiece, makes the floating positioning pin can change in the position in angular plane, when the linear expansion coefficient of the workpiece to be measured and the linear expansion coefficient of the positioning platform are greatly different, the first positioning hole of the same workpiece and the second positioning hole spacing are greatly different under different temperatures, make the measurement system can adapt to the measurement of workpiece under different temperatures.

[0026] The utility model also includes the following advantages:

[0027] (1) through the sliding seat and slide the floating positioning pin with the reference surface, when the first guide part of the floating positioning pin inserts the second positioning hole, the first guide part guides the floating positioning pin to insert the second positioning hole and adjusts the angular orientation of workpiece, simultaneously drives the floating positioning pin to move, and the center distance change of second positioning hole and first positioning hole is adapted.

[0028] (2) by the floating positioning pin and through the reference surface guide hole hinge, and through the guide hole to the floating positioning pin swing guide and swing amplitude limit, ensure the position of the first guide part of the spherical structure and the position of the second positioning hole adapt, the first guide part is inserted into the second positioning hole process adjustment workpiece angular direction, at the same time drive floating positioning pin swing, adapt to the center distance change of the second positioning hole and the first positioning hole. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structure schematic view of the pin type positioning structure of the embodiment of the utility model.

[0030] Figure 2 It is a sectional view of the pin type positioning structure. Figure 1

[0031] Figure 3 It is a sectional view of the pin type positioning structure. Figure 1

[0032] Figure 4 It is a structure schematic view (explosion view) of the floating connection structure of the embodiment of the utility model.

[0033] Figure 5 It is another view of the floating connection structure explosion view. Figure 4

[0034] Figure 6 It is a measurement system schematic view of the embodiment of the utility model.

[0035] Figure 7 It is a structure schematic view of another pin type positioning structure of the utility model.

[0036] Figure 8 It is a structure schematic view of another floating connection structure of the utility model.

[0037] Figure 9 It is an explosion view of the floating connection structure. Figure 8

[0038] Figure 10 It is another measurement system schematic view of the utility model.

[0039] Wherein:

[0040] 1, first positioning hole; 2, second positioning hole; 3, workpiece; 4, reference surface; 40, base body;

[0041] 5, reference positioning pin; 51, second connecting column; 52, second guide part;

[0042] 6, floating positioning pin; 61, first connecting column; 62, first guide part;

[0043] ​​​​7, floating connection structure; 71, sliding seat; 711, limiting wing plate; 72, sliding pad; 721, ball; 722, pad plate; 73, bottom plate; 74, through hole; 741, limiting boss; 75, hinged seat; 76, swing groove; 77, guide hole. DETAILED DESCRIPTION

[0044] The specific implementation of the present application will be described below in conjunction with the accompanying drawings.

[0045] Example one:

[0046] As shown in the drawings, the pin positioning structure for measurement of the present embodiment comprises a first positioning hole 1 and a second positioning hole 2 on a workpiece 3 to be measured, and further comprises: Figures 1-10 a reference surface 4 fixedly arranged relative to a measurement device;

[0047] a reference positioning pin 5 fixedly arranged on the reference surface 4, used for plugging with the first positioning hole 1 to determine the reference point when the workpiece 3 is positioned;

[0048] a floating connection structure 7 arranged on the reference surface 4;

[0049] a floating positioning pin 6 movably connected with the reference surface 4 through the floating connection structure 7, and the axis of the reference positioning pin 5 and the floating positioning pin 6 is located in the same plane, which is an angular positioning surface;

[0050] In the present embodiment, the reference positioning pin 5 is located in the first positioning hole 1, and the axis of the floating positioning pin 6 changes its position in the angular positioning surface during the process of the floating positioning pin 6 being inserted into the second positioning hole 2, and when the first positioning hole 1 is plugged with the reference positioning pin 5, the second positioning hole 2 is plugged with the floating positioning pin 6, and the workpiece 3 is in contact with the reference surface 4, the workpiece 3 is positioned.

[0051] The floating positioning pin 6 comprises a first connecting column 61 and a first guide part 62 at the end of the first connecting column 61; the reference positioning pin 5 comprises a second connecting column 51 fixedly connected with the reference surface 4, and a second guide part 52 is arranged at the upper end of the second connecting column 51, and the second guide part 52 is a tapered surface or a spherical surface matching the diameter of the first positioning hole 1.

[0052]

[0053] ​For a two-pin, one-sided positioning method, a guide portion is typically provided at the end of the positioning pin to guide the smooth insertion of the two circular positioning holes and the positioning pin of the workpiece 3. In this embodiment, the reference positioning pin 5 serves as the reference point for positioning the workpiece 3. It is necessary to control a small assembly gap to ensure the accuracy of the reference point's position while ensuring a smooth insertion process. Setting the second guide portion 52 as a conical or spherical surface can meet the insertion guidance requirements. Similarly, the first guide portion 62 provided at the end of the floating positioning pin 6 also facilitates insertion with the second positioning hole 2.

[0054] The reference positioning pin 5 is fixedly set on the reference surface 4 as the reference point for positioning the workpiece 3. The floating positioning pin 6 is movably set on the reference surface 4 to ensure that the axes of the two positioning pins are located in the same plane. The insertion of the floating positioning pin 6 and the second positioning hole 2 determines the angular direction of the workpiece 3, while allowing the floating positioning pin 6 to change its position in the angular plane. When the linear expansion coefficient of the workpiece 3 to be measured is significantly different from that of the positioning platform, and the distance between the first positioning hole 1 and the second positioning hole 2 of the same workpiece 3 varies significantly at different temperatures, the measurement system can adapt to the measurement of the workpiece 3 at different temperatures.

[0055] Example 2:

[0056] Based on Example 1, such as Figures 1-5 As shown, the floating positioning pin 6 of the pin-type positioning structure applied to measurement in this embodiment includes a first connecting post 61 and a first guide portion 62 located at the end of the first connecting post 61. The first guide portion 62 is a conical surface or a spherical surface that matches the diameter of the second positioning hole 2.

[0057] The floating connection structure 7 includes a sliding seat 71 that is slidably connected to the reference surface 4. A first connecting post 61 is fixedly installed on the sliding seat 71. The sliding direction of the sliding seat 71 is the direction of the center line connecting the reference positioning pin 5 and the floating positioning pin 6.

[0058] In this embodiment, the axes of the reference positioning pin 5 and the floating positioning pin 6 are parallel to each other and both are perpendicular to the reference surface 4.

[0059] The first guide part 62 is a conical or spherical surface that matches the diameter of the second positioning hole 2. This means that the maximum size of the conical or spherical surface has a small assembly gap with the second positioning hole 2, ensuring the accuracy of angular positioning while making the insertion process smooth.

[0060] The floating positioning pin 6 is slidably connected to the reference surface 4 by the sliding seat 71. When the first guide part 62 of the floating positioning pin 6 is inserted into the second positioning hole 2, the first guide part 62 guides the floating positioning pin 6 to be inserted into the second positioning hole 2 to adjust the angular direction of the workpiece 3, and at the same time drives the floating positioning pin 6 to move to adapt to the change in the center distance between the second positioning hole 2 and the first positioning hole 1.

[0061] As to the assembling structure of the floating connecting structure 7, in another embodiment, as shown in Figure 4 、 Figure 5 the datum surface 4 is located on the surface of the base 40, the floating connecting structure 7 further comprises a through hole 74 penetrating the base 40, the through hole 74 is provided with a limiting boss 741 on both sides, a sliding seat 71 is located in the through hole 74, the sliding seat 71 is provided with a limiting wing plate 711 corresponding to the limiting boss 741, and a bottom plate 73 is fixedly installed at the bottom of the through hole 74, the bottom plate 73 and the limiting boss 741 form a sliding groove matched with the limiting wing plate 711, and the datum surface 4 is slidingly connected with the sliding seat 71.

[0062] The sliding seat 71 and the bottom plate 73 are provided with a sliding pad 72 slidingly connected with the sliding seat 71.

[0063] In another embodiment, as shown in Figure 4 、 Figure 5 the sliding pad 72 comprises a pad plate 722 and a plurality of rolling balls 721 rotatably installed on the pad plate 722, and the plurality of rolling balls 721 are slidingly connected with the sliding seat 71. The sliding seat 71 slides smoothly.

[0064] In the case where the positioning accuracy requirement is not particularly high, in another embodiment, the cross section of the first connecting column 61 is rhombic, the structural size of the rhombus is smaller than the cross section size of the second positioning hole 2, and the projection shape of the first guide part 62 on the datum surface 4 is the same as the rhombus. Specifically, as shown in Figure 2 the distance between a pair of vertices of the rhombus located on the center line of the two positioning pins is smaller than the diameter of the second positioning hole 2, so that the positioning is more smooth.

[0065] Embodiment Three:

[0066] The measuring system of the embodiment comprises the pin positioning structure applied to measurement of the embodiments one or two. As shown in Figure 6 the exemplary measuring system comprises a lever type aperture measuring device, and the floating positioning pin 6 in the pin positioning structure is a guide head of the measuring device.

[0067] Embodiment Four:

[0068] Based on the embodiment one, as shown in Figures 7-10 the floating positioning pin 6 of the pin positioning structure applied to measurement of the embodiment comprises a first connecting column 61 and a first guide part 62 located at the end of the first connecting column 61, and the first guide part 62 is a spherical surface matched with the diameter of the first positioning hole 1.

[0069] The reference surface 4 is located on the surface of the base 40, the floating connection structure 7 comprises a guide hole 77 penetrating the reference surface 4, the first connecting column 61 is hinged with the base 40, the first guide part 62 is located outside the guide hole 77, the width direction side wall of the guide hole 77 is in contact with two sides of the first connecting column 61, for limiting the axis of the first connecting column 61 to be located on the angular positioning surface, the length direction side wall of the guide hole 77 corresponds to the other two sides of the first connecting column 61, for limiting the swing amplitude of the first connecting column 61.

[0070] The first guide part 62 is a spherical surface matched with the diameter of the first positioning hole 1, that is, the maximum size position of the spherical surface has a small assembly gap with the second positioning hole 2, so that the angular positioning accuracy is ensured and the insertion process is smooth. When the reference positioning pin 5 is inserted into the first positioning hole 1, and the first guide part 62 of the spherical surface structure is inserted into the second positioning hole 2, the positioning center and the angular position of the workpiece 3 are simultaneously limited.

[0071] By hinging the floating positioning pin 6 with the guide hole 77 penetrating the reference surface 4, and by swing guiding and swing amplitude limiting of the floating positioning pin 6 through the guide hole 77, the position of the first guide part 62 of the spherical surface structure is matched with the position of the second positioning hole 2, the angular position of the workpiece 3 is adjusted during the insertion of the first guide part 62 into the second positioning hole 2, and the floating positioning pin 6 is driven to swing, so as to adapt to the center distance change between the second positioning hole 2 and the first positioning hole 1.

[0072] Regarding the assembly structure of the floating connection structure 7, in another embodiment, as shown in Figure 8 , Figure 9 The guide hole 77 is a through hole penetrating the base 40, the floating connection structure 7 further comprises a hinge seat 75, the first connecting column 61 is hingedly installed on the hinge seat 75, and the hinge seat 75 is detachably fixedly connected with the base 40.

[0073] The lower end of the first connecting column 61 is located in the swing groove 76 of the hinge seat 75, and the first connecting column 61 is hingedly connected with the hinge seat 75 through a pin shaft.

[0074] Embodiment five:

[0075] The measurement system of the embodiment comprises the pin positioning structure applied to measurement of the embodiments one or four, as shown in Figure 10 The exemplary measurement system comprises a lever hole diameter measuring device, and the floating positioning pin 6 in the pin positioning structure is a guide head of the measuring device.

[0076] The above description is an explanation of the utility model, not a limitation of the utility model, the scope defined by the utility model is referred to the claims, and any form of modification can be made within the protection scope of the utility model.

Claims

1. A pin positioning structure for use in measurement, characterized by: The application relates to a positioning device for a workpiece (3) to be measured, which comprises a first positioning hole (1) and a second positioning hole (2) on the workpiece (3) to be measured, and further comprises: a reference surface (4) fixedly arranged relative to a measuring device; a reference positioning pin (5) fixedly arranged on the reference surface (4) and used for inserting into the first positioning hole (1) to determine a reference point when the workpiece (3) is positioned; a floating connection structure (7) arranged on the reference surface (4); a floating positioning pin (6) movably connected with the reference surface (4) through the floating connection structure (7), and the axis of the reference positioning pin (5) and the floating positioning pin (6) is located in the same plane, which is an angular positioning surface; wherein the reference positioning pin (5) is located in the first positioning hole (1), the floating positioning pin (6) is inserted into the second positioning hole (2), the axis of the floating positioning pin (6) changes the position in the angular positioning surface along with the position of the second positioning hole (2), and after the first positioning hole (1) and the reference positioning pin (5) are inserted, the second positioning hole (2) and the floating positioning pin (6) are inserted, and the workpiece (3) and the reference surface (4) are contacted, the workpiece (3) is positioned.

2. The pin positioning structure for measurement according to claim 1, wherein: The floating positioning pin (6) comprises a first connecting column (61) and a first guide part (62) arranged at the end of the first connecting column (61), and the first guide part (62) is a conical surface or a spherical surface matched with the diameter of the second positioning hole (2); the floating connection structure (7) comprises a sliding seat (71) slidably connected with the reference surface (4), and the first connecting column (61) is fixedly arranged on the sliding seat (71), and the sliding direction of the sliding seat (71) is the direction of the center line of the reference positioning pin (5) and the floating positioning pin (6).

3. A pin positioning structure for measurement as claimed in claim 2, wherein: The reference surface (4) is arranged on the surface of a base body (40), the floating connection structure (7) further comprises a through hole (74) penetrating through the base body (40), limit bosses (741) are arranged on the two sides of the through hole (74), the sliding seat (71) is arranged in the through hole (74), limit wings (711) corresponding to the limit bosses (741) are arranged on the sliding seat (71), a bottom plate (73) is fixedly arranged at the bottom of the through hole (74), and a sliding groove matched with the limit wings (711) is formed between the limit bosses (741) and the bottom plate (73), so that the reference surface (4) and the sliding seat (71) are slidably connected.

4. The pin positioning structure for measurement according to claim 3, wherein: A sliding pad (72) slidably connected with the sliding seat (71) is arranged between the sliding seat (71) and the bottom plate (73).

5. A pin positioning structure for measurement as claimed in claim 4, wherein: The sliding pad (72) comprises a pad plate (722) and a plurality of rolling balls (721) rotatably arranged on the pad plate (722), and the plurality of rolling balls (721) are slidably connected with the sliding seat (71).

6. The pin positioning structure for measurement according to claim 2, wherein: The first connecting column (61) has a rhombic cross section, the structure size of the rhombic shape is smaller than the cross section size of the second positioning hole (2), and the projection shape of the first guide part (62) on the reference surface (4) is the same as the rhombic shape.

7. The pin positioning structure for measurement according to claim 1, wherein: The floating positioning pin (6) comprises a first connecting column (61) and a first guide part (62) at the end of the first connecting column (61), and the first guide part (62) is a spherical surface matched with the diameter of the first positioning hole (1). The reference surface (4) is located on the surface of the base body (40), the floating connecting structure (7) comprises a guide hole (77) penetrating the reference surface (4), the first connecting column (61) is hinged to the base body (40), the first guide part (62) is located outside the guide hole (77), the width direction side wall of the guide hole (77) is in contact with both sides of the first connecting column (61), and the width direction side wall is used for limiting the axis of the first connecting column (61) to be located on the angular positioning surface, and the length direction side wall of the guide hole (77) corresponds to the other two sides of the first connecting column (61), and the length direction side wall is used for limiting the swing amplitude of the first connecting column (61).

8. A pin positioning structure for measurement as claimed in claim 7, characterized in that: The guide hole (77) is a through hole penetrating the base body (40), and the floating connecting structure (7) further comprises a hinge seat (75), the first connecting column (61) is hingedly installed on the hinge seat (75), and the hinge seat (75) is detachably fixedly connected with the base body (40).

9. The pin positioning structure for measurement according to claim 1, wherein: The reference positioning pin (5) comprises a second connecting column (51) fixedly connected with the reference surface (4), and a second guide part (52) is arranged at the upper end of the second connecting column (51), and the second guide part (52) is a conical surface or a spherical surface matched with the diameter of the first positioning hole (1).

10. A measurement system characterized by: The pin type positioning structure applied to measurement comprises the application of any one of claims 1-9. The pin type positioning structure applied to measurement comprises the application of any one of claims 1-9.

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