CN213274016U - Positioning mechanism for checking fixture - Google Patents

Abstract

The utility model provides a positioning mechanism for examining utensil, including locating pin, sleeve and elastic component, the sleeve is fixed in examine utensil, the locating pin is suitable for from telescopic open end insert and for sleeve slidable, and have the follow the first end that telescopic open end stretches out, the second end of locating pin with the elastic component has been arranged between the telescopic bottom, the first end of locating pin is provided with location portion, location portion has the cross sectional dimension who increases towards telescopic open end from the terminal surface of first end to form the outer peripheral face that has the tapering. The utility model discloses a positioning mechanism has multiple functions, can enough realize the autonomic accurate positioning of the part that awaits measuring, can dodge out the locating hole again, can also regard as conventional positioning mechanism to use, has improved the efficiency of examining the utensil and detecting effectively, and the additional cost is low, easily promotes.

Description

Positioning mechanism for checking fixture

Technical Field

The utility model relates to an examine the utensil field, more specifically relates to a positioning mechanism for examining utensil.

Background

The checking fixture is special checking equipment for measuring and evaluating the size and quality of parts. The part can be detected on line on a part production site through the detection tool, so that the part needs to be accurately installed and positioned on the detection tool, the molded surface and the periphery of the part are inspected through visual inspection, a scale or a caliper, and holes with different properties on the part and the connection position between the part and the part can be visually inspected through an inspection pin or visual inspection, so that the quality state of the part can be rapidly judged during trial production and starting production.

In this case, it can be judged by visual inspection or measurement that: deviation between the size and shape area of the periphery of the part outline and the relative position and the theoretical value of the checking tool directly processed by CAD/CAM. For some extremely important functional dimensions on the part, the checking fixture can be used for numerical detection, the accurate coordinate values of the part based on a vehicle body coordinate system can not be directly obtained by the checking fixture, and the part is placed on the checking fixture and is obtained only by measuring through a three-coordinate measuring machine. Therefore, the structure of the checking fixture in the existing design can be used as a measuring bracket by considering the structure during design.

The measuring support is an auxiliary support when a three-coordinate measuring machine is used for measuring parts, all supporting surfaces (points) and positioning reference surfaces (points) of the measuring support are milled according to CAD data of the parts, and measuring supports of some special parts also have the function of a part checking tool.

Therefore, the checking fixture can be used as a measuring support to realize the on-line detection function, and parts can be positioned on the checking fixture more accurately and more efficiently. However, most of the positioning mechanisms on the current checking fixture still adopt cylindrical positioning pins, which lack direct and intuitive judgment on whether the positioning holes on the parts are qualified or not, and the positioning is difficult to achieve accurately, which easily causes the misplacement of the parts and the missed judgment of measurement.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the defect that exists among the above-mentioned prior art, provide a positioning mechanism for examining utensil, this positioning mechanism makes simply and has multiple functions.

In order to achieve the above object, the utility model provides a positioning mechanism for examining utensil, including locating pin, sleeve and elastic component, the sleeve is fixed in examine the utensil, the locating pin is suitable for from telescopic open end insert and for the sleeve is slidable, and has follow the first end that the telescopic open end stretches out, the second end of locating pin with the elastic component has been arranged between the telescopic bottom, the first end of locating pin is provided with location portion, location portion has the cross sectional dimension that increases from the terminal surface of first end towards telescopic open end to form the outer peripheral face that has the tapering.

In accordance with the above-described concepts, the present invention may further include any one or more of the following alternatives.

In some alternative forms, the maximum cross-sectional dimension and the minimum cross-sectional dimension of the positioning portion depend on the diameter tolerance of the positioning hole on the part to be measured.

In some alternative forms, the locating mechanism further includes a sliding stop assembly including a stop slot provided on one of the locating pin and the sleeve and a stop provided on the other of the locating pin and the sleeve.

In some alternative forms, the retaining groove is an L-shaped retaining groove including a vertical section in a longitudinal direction of the locating pin or sleeve, and a horizontal section in a transverse direction of the locating pin or sleeve.

In some alternative forms, the locating pin is further provided with an operating face located at an end face of the first end, and the operating face is provided with a tool slot.

In some alternative forms, a chamfer is provided between the operative surface and the locating portion, the tool slot being located within the chamfer.

In some alternative forms, the locating mechanism further includes an adjustment assembly for adjusting the maximum protrusion of the locating pin relative to the open end of the sleeve.

In some alternative forms, the adjustment assembly includes an adjustment bolt extending from a first end of a locating pin through a first through hole provided in the locating pin, the resilient member, a second through hole provided in a bottom end of the sleeve in sequence out of the sleeve, and having a head portion of increased size to abut a shoulder provided in the first through hole of the locating pin, wherein the second through hole and the adjustment bolt are provided with mutually adapted threads.

In some alternative forms, the open end of the sleeve is provided with a flange, the flange is provided with a hole which communicates with the interior of the sleeve, and a fastener is arranged in the hole and fixes the positioning pin relative to the sleeve.

The utility model discloses following beneficial technological effect has: through setting up on examining the utensil the utility model discloses a positioning mechanism can detect the locating hole on the part that awaits measuring whether qualified directly perceivedly to the part that awaits measuring can be fixed a position on examining the utensil without removing the clearance, thereby realizes the autonomic accurate positioning of the part that awaits measuring.

Drawings

Other features and advantages of the present invention will be better understood by the following detailed description of the preferred embodiments when considered in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof, and wherein:

fig. 1 shows a perspective view of a positioning mechanism according to an embodiment of the present invention;

FIG. 2 shows a cross-sectional view of the positioning mechanism of FIG. 1;

fig. 3 shows an exploded view of the positioning mechanism of fig. 1.

Skilled artisans will appreciate that elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the figures may be exaggerated relative to other elements to help improve understanding of embodiments of the present disclosure.

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 accompanying 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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In this specification, the terms "first" and "second" are not used to limit the order and number of components unless otherwise specified.

In an exemplary embodiment, as shown in fig. 1 to 3, the positioning mechanism 10 is used for a testing tool (also referred to as a measuring support), and includes a positioning pin 1, a sleeve 2 and an elastic member 3, wherein the sleeve 2 is fixed to the testing tool in an insertable manner, for example, and the positioning pin 1 is adapted to be inserted from an open end 21 of the sleeve 2 and is slidable relative to the sleeve 2, as shown in fig. 2, the positioning pin 1 has a first end 11 protruding from the open end 21 of the sleeve 2, and the elastic member 3 is disposed between a second end 12 of the positioning pin 1 opposite to the first end 11 and a bottom end 22 of the sleeve 2, and it can be seen that the elastic member 3 plays a role of elastic support for the positioning pin 1. Further, the first end 11 of the positioning pin 1 is provided with a positioning portion 111, the positioning portion 111 having a sectional dimension that increases from an end surface of the first end 11 toward the open end 21 of the sleeve 2 to form an outer peripheral surface having a taper.

Fig. 1 to 3 show the taper of the positioning portion 111 in an exaggerated manner, and in practice, the taper of the positioning portion 111 may be set to 1.3 °, and the maximum cross-sectional size and the minimum cross-sectional size of the positioning portion 111 for detecting whether the positioning hole of the part to be measured is acceptable depend on the diameter tolerance of the positioning hole (not shown) on the part to be measured. Alternatively, the minimum cross-sectional diameter of the positioning portion 111 is the minimum diameter of the positioning hole during the manufacturing process, and the maximum cross-sectional diameter of the positioning portion 111 is the maximum diameter of the positioning hole during the manufacturing process.

In an alternative embodiment, in order to better guide the up-and-down sliding of the locating pin 1 relative to the sleeve 2, the locating mechanism 10 further comprises a sliding limit assembly including a limit groove provided on one of the locating pin 1 and the sleeve 2 and a limit stop provided on the other of the locating pin 1 and the sleeve 2. In the exemplary embodiment shown in fig. 3, the sliding position limiting assembly includes a position limiting groove 13 provided on the positioning pin 1 and a position limiting member 23 provided on the sleeve 2. Preferably, the stopper 23 is a stopper screw which is engaged with the cylindrical wall of the sleeve 2 by means of a screw thread, and the stopper 23 guides the positioning pin 1 to slide up and down with respect to the sleeve 2 by being engaged with the stopper groove 13. Alternatively, although not shown, the stopper may be an elastic ball that is provided on the dowel 1 and engages with a stopper groove provided on the sleeve 2, and further, the elastic ball is retracted into the wall surface of the dowel 1 when the dowel 1 enters the sleeve 2, and when the elastic ball reaches the stopper groove, the elastic ball protrudes from the wall surface of the dowel 1 and engages with the stopper groove by, for example, the elastic action of a spring, and does not fall out of the stopper groove.

In an alternative embodiment, the retaining groove is an L-shaped retaining groove including a vertical section in the longitudinal direction of the locating pin or sleeve, and a horizontal section in the transverse direction of the locating pin or sleeve. As shown in fig. 3, the limiting groove 13 on the positioning pin 1 is an L-shaped limiting groove, which includes a vertical section 131 and a horizontal section 132, the vertical section 131 is used for guiding the positioning pin 1 to slide up and down relative to the sleeve 2, and the horizontal section 132 is used for limiting the positioning pin 1 to slide up and down relative to the sleeve 2, that is, when the limiting member enters the horizontal section of the limiting groove, the positioning pin 1 cannot slide up and down relative to the sleeve 2. Specifically, in the up-down direction shown in the figure, when the limit groove is located on the positioning pin 1, the horizontal section of the limit groove is located above the vertical section; when the limiting groove is positioned on the sleeve 2, the horizontal section of the limiting groove is positioned below the vertical section. The positioning pin 1 cannot slide up and down relative to the sleeve 2, so that the first end 11 of the positioning pin 1 is fixed to the minimum extension amount of the sleeve 2, when the minimum extension amount is obtained, the positioning pin 1 lets out the positioning hole in the part to be measured, namely the positioning pin 1 cannot interfere with the positioning hole in the part to be measured, and therefore a detector can directly measure the specific size of the positioning hole in the part to be measured. This is because, when the positioning pin 1 can slide up and down relative to the sleeve 2, the positioning portion 111 on the positioning pin 1 can determine whether the positioning hole on the part to be measured is qualified (i.e. whether the positioning hole is within the tolerance range of the positioning hole), and the specific size of the positioning hole cannot be known, and only after the part to be measured is clamped, the positioning portion 111 of the positioning pin 1 is separated from the positioning hole, and the specific size of the positioning hole can be measured (e.g. by a vernier caliper).

In order to make the limiting member enter the horizontal segment of the limiting groove, the positioning pin 1 is further provided with an operation surface 112, the operation surface 112 is located on the end surface of the first end 11, and a tool groove 1120 is arranged on the operation surface 112. Specifically, a chamfer 113 is provided between the operation surface 112 and the positioning portion 111, and it is particularly emphasized that the chamfer 113 does not belong to the positioning portion 111, and the tool groove 1120 is preferably located in the chamfer 113. By providing the tool slot 1120, the inspector rotates the locating pin 1 relative to the sleeve 2 by using a tool (e.g., a paddle), and when the limiter enters the horizontal segment of the limiting slot, the locating pin 1 will be positioned within the sleeve 2 with a minimum amount of protrusion.

In an alternative embodiment, the positioning mechanism 10 further comprises an adjustment assembly for adjusting the maximum protrusion of the positioning pin 1 with respect to the open end 21 of the sleeve 2. Specifically, the adjusting assembly comprises an adjusting bolt 4, the adjusting bolt 4 passes through a first through hole 14 arranged on the positioning pin 1, the elastic member 3 and a second through hole 24 arranged on a bottom end 22 of the sleeve 2 from a first end 11 of the positioning pin 1 in sequence and extends out of the sleeve 2, as shown in fig. 2, the first through hole 14 of the positioning pin 1 is a T-shaped through hole and penetrates from an end surface of the first end 11 of the positioning pin 1 to an end surface of a second end 12, the adjusting bolt 4 is provided with a head 41 with an enlarged size to be abutted against a shoulder 141 arranged in the first through hole 14 of the positioning pin 1, wherein the second through hole 24 and the adjusting bolt 4 are provided with mutually matched threads, namely, the adjusting bolt 4 is in threaded connection with the sleeve 2 at the position of the second through hole 24 of the sleeve 2, and the length of the end 42 of the adjusting bolt 4 opposite to the head 41 thereof extending out of the sleeve 2 can be adjusted through such threaded, so that the maximum projection of the dowel 1 with respect to the open end 21 of the sleeve 2 is adjusted by means of the abutment of the head 41 against the shoulder 141. It is noted that the pin 1 is slidable relative to the sleeve 2 regardless of how the maximum extension is adjusted, unless the stop enters the horizontal section of the slot.

In an alternative embodiment, the open end 21 of the sleeve 2 is provided with a flange 25, the flange 25 is provided with a hole 251 through the interior of the sleeve 2, the hole 251 may be provided with a fastener 26, and the dowel 1 may be fixed relative to the sleeve 2 by means of the fastener 26. Under the condition that the positioning pin 1 extends out of the sleeve 2 by a required length, the positioning pin 1 is tightly abutted in the sleeve 2 through the fastener 26, and the positioning pin 1 is prevented from rotating and sliding up and down, so that the function of a conventional positioning pin is achieved.

The utility model discloses a positioning mechanism 10 can set up position and quantity as required when examining the utensil and use, and the locating hole on the part that awaits measuring usually includes main locating hole and assistance locating hole, when freely putting into the part that awaits measuring and examining the utensil for main locating hole with assist the locating hole and aim at positioning mechanism 10's locating pin 1, the part that awaits measuring will automatic positioning and the center of accurate alignment locating hole. If the positioning hole on the part to be measured cannot penetrate through the positioning pin 1 to be jointed with the positioning part 111 or directly cross over the positioning part 111, it indicates that the size of the positioning hole exceeds the tolerance range, and if the positioning hole on the part to be measured has a distance to the end surface of the first end 11 of the positioning pin 1 or the part to be measured is obviously jacked up, the positioning pin 1 can be adjusted to a proper height by adjusting the adjusting bolt 4 in the positioning pin 1. Therefore, when the minimum cross-sectional dimension of the positioning portion 111 of the positioning pin 1 (which should not include the chamfer 113) can expose the positioning hole of the part to be measured and the maximum cross-sectional dimension does not expose, it indicates that the positioning hole is within the tolerance range. Through the operation, whether the positioning hole on the part to be detected is qualified or not can be easily judged.

After the part to be measured is positioned on the positioning mechanism 10, the part to be measured is clamped by the fixture on the checking fixture, then, a tool is engaged with the tool groove 1120 on the positioning pin 1 to enable the positioning pin 1 to descend and rotate, and after the limiting part enters the horizontal section of the limiting groove, the positioning pin 1 is limited to slide and the positioning hole of the part to be measured is led out, so that the specific size of the positioning hole can be directly measured.

Further, the dowel pin 1 may be fixed relative to the sleeve 2 by the fastener 26, and the height at which the dowel pin 1 is fixed relative to the sleeve 2 may also be selected.

In addition, positioning pin 1 can design positioning portion 111 with different sizes according to positioning holes with different size requirements, that is, the taper, the minimum cross-sectional size, and the maximum cross-sectional size of positioning portion 111 can be adaptively changed. When measuring the positioning holes with different size requirements of the part to be measured, the positioning pin 1 is replaced.

Therefore, the utility model discloses a positioning mechanism has multiple functions, can enough realize the autonomic accurate positioning of the part that awaits measuring, can dodge out the locating hole again, can also regard as conventional positioning mechanism to use, has improved the efficiency of examining the utensil and detecting effectively, and the additional cost is low, easily promotes.

Although some embodiments have been described herein by way of example, various modifications may be made to these embodiments without departing from the spirit of the invention, and all such modifications are intended to be included within the scope of the invention as defined in the following claims.

The particular embodiments disclosed herein are illustrative only, as the invention may be modified in nature and equivalents thereof, apparent to those skilled in the art from the teachings herein, and, thus, the specific embodiments of the invention disclosed above are illustrative only, and are not to be considered in a limiting sense as to the details of construction or design herein disclosed unless otherwise specified in the claims. Accordingly, the particular illustrative embodiments disclosed above are susceptible to various substitutions, combinations or modifications, all of which are within the scope of the disclosure. The techniques illustratively disclosed herein suitably may be practiced in the absence of any element that is not specifically disclosed herein or in the absence of any optional component disclosed herein.

Claims (9)

1. A positioning mechanism for a gauge, comprising a positioning pin, a sleeve and an elastic member, the sleeve being fixed to the gauge, the positioning pin being adapted to be inserted from an open end of the sleeve and to be slidable relative to the sleeve, and having a first end protruding from the open end of the sleeve, the elastic member being arranged between a second end of the positioning pin and a bottom end of the sleeve, characterized in that the first end of the positioning pin is provided with a positioning portion having a cross-sectional dimension that increases from an end surface of the first end toward the open end of the sleeve to form a tapered outer circumferential surface.

2. The positioning mechanism for the checking fixture according to claim 1, wherein the maximum cross-sectional dimension and the minimum cross-sectional dimension of the positioning portion depend on a diameter tolerance of a positioning hole in the part to be checked.

3. The positioning mechanism for a testing fixture of claim 1, further comprising a sliding stop assembly, the sliding stop assembly comprising a stop groove disposed on one of the locating pin and the sleeve and a stop disposed on the other of the locating pin and the sleeve.

4. The positioning mechanism for the detection tool according to claim 3, wherein the limiting groove is an L-shaped limiting groove and comprises a vertical section along the longitudinal direction of the positioning pin or the sleeve and a horizontal section along the transverse direction of the positioning pin or the sleeve.

5. The positioning mechanism for the detection tool according to claim 4, wherein the positioning pin is further provided with an operation surface, the operation surface is located on the end surface of the first end, and a tool groove is formed in the operation surface.

6. The positioning mechanism for the checking fixture according to claim 5, wherein a chamfer is provided between the operating surface and the positioning portion, and the tool groove is located in the chamfer.

7. The positioning mechanism for a gauge according to any one of claims 1 to 6, further comprising an adjustment assembly for adjusting a maximum protrusion of the locating pin relative to the open end of the sleeve.

8. The positioning mechanism for the detection tool according to claim 7, wherein the adjusting assembly comprises an adjusting bolt, the adjusting bolt sequentially passes through a first through hole formed in the positioning pin, the elastic member and a second through hole formed in the bottom end of the sleeve from the first end of the positioning pin to extend out of the sleeve, the adjusting bolt is provided with a head portion with an enlarged size to abut against a shoulder formed in the first through hole of the positioning pin, and the second through hole and the adjusting bolt are provided with mutually matched threads.

9. The positioning mechanism for the detection tool according to claim 7, wherein a flange is arranged at an opening end of the sleeve, a hole is formed in the flange and communicated with the interior of the sleeve, and a fastener is arranged in the hole and fixes the positioning pin relative to the sleeve.

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