Positioning mechanism for tubular part with inner annular protrusion at end

Abstract

A positioning mechanism for a tubular part with an inner annular protrusion at the end comprises a fixing seat with an inner cavity, a supporting table which extends towards the outer side in the circumferential direction and is used for supporting the tubular part is arranged at the position, deviating from the end, of the fixing seat, and a movable column and a plurality of balls are arranged in the inner cavity. The fixed seat is provided with a plurality of matching holes which are annularly arranged at intervals and penetrate through the inside and the outside, the movable column is matched with a spring, the movable column has a tending force for moving towards one axial side under the action of the spring and enables a ball part to be pushed out of the matching holes, and a supporting table extending towards the outer side in the circumferential direction is arranged at the position, deviating from the end, of the fixed seat. The fixing base is further provided with an elastic annular protrusion extending towards the outer side in the circumferential direction, the elastic annular protrusion and the matching hole are located on the same side of the supporting table, and the circumferential outer wall of the elastic annular protrusion gradually extends towards the outer side in the circumferential direction from the side away from the supporting table to the side close to the supporting table. The utility model has the advantage that the positioning coaxial precision and the positioning and fixing stability of the tubular part can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the connection positioning between two components, in particular to a positioning mechanism for tubular part with inner annular protrusion. BACKGROUND

[0002] In prior art, for tubular part with inner annular protrusion, outer clamping mechanism or inner clamping mechanism is arranged on support table to position and fix, due to the size limitation of tubular part, the inner clamping generally adopts the way of steel ball embracing type locking, through the way of moving one component to push multiple steel balls out along radial direction to make steel ball press tightly on the axial surface of inner annular protrusion, so as to realize the clamping of tubular part with inner annular protrusion.

[0003] The above scheme can position tubular part with inner annular protrusion on support table, but due to machining error and size error, it is difficult to ensure that the end surface of tubular part and support table are in effective contact at the same time and the end surface of inner annular protrusion and steel ball are in effective contact, the positioning effect is poor, and the coaxial positioning precision of tubular part is poor. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a positioning mechanism for tubular part with inner annular protrusion, which has better positioning and fixing effect and higher positioning precision.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a positioning mechanism for tubular part with inner annular protrusion, comprising a fixed seat with an inner cavity, the fixed seat has a support table extending to the circumferential outer side and used for supporting the tubular part at the deviated end part, a movable column and a plurality of balls are arranged in the inner cavity, the fixed seat has a plurality of annularly spaced and internally and externally penetrating cooperation holes, the movable column is matched with a spring, the movable column has a tendency to move to one side of the axial direction under the action of the spring and makes the balls partially pushed out to the outside of the cooperation hole, the fixed seat has a support table extending to the circumferential outer side at the deviated end part, the fixed seat further has an elastic annular protrusion extending to the circumferential outer side, the elastic annular protrusion and the cooperation hole are located on the same side of the support table, and the circumferential outer wall of the elastic annular protrusion gradually extends to the circumferential outer side from the side far away from the support table to the side close to the support table.

[0006] When the positioning of the tubular part is needed, first, external force is applied to the movable column to make the movable column overcome the elastic force of the spring, so as to realize the exit of the balls, then the tubular part with the inner annular protrusion is inserted on the movable column and located on the support table, finally, the force applied to the movable column is cancelled, the movable column moves axially under the action of the spring and pushes all the balls out, so as to make the outer surface of the balls abut against the axial surface of the inner annular protrusion of the tubular part; at the same time, the elastic annular protrusion on the fixed seat contacts or even abuts against the inner wall of the tubular part, finally, the positioning and fixing of the tubular part are realized.

[0007] The elastic annular protrusion and the ball and spring combination of the utility model can exert elastic force on the tubular part, and can avoid damage to the tubular part. The elastic annular protrusion is annular, and has high overall structural strength; the circumferential outer wall of the elastic annular protrusion is a conical surface, which can ensure effective contact with the tubular part, and only needs to ensure the size of the fixed seat, the movable column and the steel ball, so that the positioning coaxial precision and positioning and fixing stability of the tubular part can be ensured.

[0008] When the utility model is used for a tool clamp, the movable column can overcome the spring elastic force through a pneumatic cylinder; when the utility model is used for connecting product parts, the movable column can be matched with a pull pin and a pull ring to facilitate manual pulling by a user.

[0009] When the distance between the inner annular protrusion of the tubular part and the end face of the tubular part is long, the number of elastic annular protrusions can be set according to actual needs; the elastic annular protrusion can be embedded on the fixed seat or integrally formed on the fixed seat, and the elastic annular protrusion can be made of rubber material, spring steel or other materials according to the fixed style.

[0010] As a preferred embodiment, the inner cavity sequentially comprises a thin section and a wide section along the axial direction of the movable column, the ball is located in the thin section, the movable column has an extension extending to the circumferential outer side, the extension is always located in the wide section, and the two ends of the spring are in contact with the extension and the wide section respectively. The above setting ensures that the spring has sufficient size, so that a spring with greater elastic force can be used to ensure the pushing effect on the ball and further ensure the positioning effect on the tubular part.

[0011] As a preferred embodiment, the movable column has a ring-shaped matching groove on the circumferential outer wall, the matching groove has a first matching section and a second matching section along the axial direction, the diameter of the first matching section gradually increases from the side close to the second matching section to the side away from the second matching section, and the diameter of the second matching section gradually increases from the side close to the first matching section to the side away from the first matching section.

[0012] As a preferred embodiment, the number of elastic annular protrusions is at least two, and the at least two elastic annular protrusions are arranged at intervals along the axial direction of the movable column.

[0013] As a preferred embodiment, the part of the fixed seat located on one side of the support table sequentially comprises a first fixed seat section and a second fixed seat section along the axial direction, the matching hole is arranged at the first fixed seat section, the elastic annular protrusion is arranged at the second fixed seat section, and the first fixed seat section is farther away from the support table than the second fixed seat section.

[0014] As preferred, the second section of the fixing base deviates from the elastic annular protrusion by a width smaller than that of the first section of the fixing base.

[0015] The utility model can guarantee the positioning coaxial precision and positioning fixing stability of the tubular part with the inner convex ring at the end. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a sectional view of the positioning mechanism of the embodiment.

[0017] Figure 2 It is a structural schematic view of the fixing base of the positioning mechanism of the embodiment. DETAILED DESCRIPTION

[0018] The utility model will be further described below according to the drawings and specific embodiments.

[0019] As shown in the drawings, Figure 1 and Figure 2 The embodiment discloses a positioning mechanism for tubular part with inner annular protrusion at the end, which comprises a fixing base 1, the fixing base 1 has an upwardly open and vertically extending inner cavity, the inner cavity is provided with a movable column 2 and a plurality of spheres 3, the fixing base 1 has a support table 10 extending to the circumferential outside, the table top of the support table 10 is located at the middle part of the fixing base 1, the upper part of the fixing base 1 is provided with a plurality of annularly spaced and internally and externally penetrating matching holes 11, the spheres 3 correspond to the matching holes 11 one by one, the minimum diameter of the outer end of the matching hole 11 is smaller than the diameter of the sphere 3, the movable column 2 is matched with a spring (not shown in the drawing), the movable column 2 has a downward moving tendency under the action of the spring and makes the sphere 3 partially pushed out to the outside of the matching hole 11, so that the inner annular protrusion 201 of the tubular part 200 can be limited between all the spheres 3 and the table top of the support table 10. Wherein, the embodiment is a tooling, which is used for positioning the product or other tooling of the tubular part 200;The fixing base 1 is provided with an air inlet 101 and an air outlet 102 communicated with the inner cavity, and the compressed gas is filled in the mode, so as to overcome the elastic force of the spring.

[0020] The fixing base 1 is also provided with two elastic annular protrusions 12 extending to the circumferential outside, the elastic annular protrusions 12 and the matching holes 11 are all located on the upper side of the support table 10, the circumferential outer wall of the elastic annular protrusion 12 gradually extends to the circumferential outside from top to bottom, and the two elastic annular protrusions 12 are arranged in an upper and lower interval along the axial direction of the movable column 2. Wherein, since the end inner wall of the tubular part 200 is a conical surface, the width of the two elastic annular protrusions 12 of the embodiment is different, the lower elastic annular protrusion 12 is wider, and at the same time, in order to ensure the close contact with the inner wall of the tubular part 200, the taper angle of the elastic annular protrusion 12 is different from that of the end inner wall of the tubular part 200.

[0021] The inner cavity includes a thin section and a wide section in sequence in the up-down direction, the ball 3 is located in the thin section, the lower end of the movable column 2 has an extension 20 extending to the circumferential outside, the extension 20 is always located in the wide section, the two ends of the spring are in contact with the end face of the extension 20 and the end face of the wide section respectively, and the extension 20 and the wide section are both provided with a positioning groove 40 for positioning the end face of the spring.

[0022] The movable column 2 has a matching groove in the circumferential outer wall, the matching groove has a first matching section 21 and a second matching section 22 in sequence in the axial direction, the diameter of the first matching section 21 gradually increases from the side close to the second matching section 22 to the side far from the second matching section 22, and the diameter of the second matching section 22 gradually increases from the side close to the first matching section 21 to the side far from the first matching section 21.

[0023] The part of the fixed seat 1 located on the upper side of the support table 10 includes a fixed seat first section 103 and a fixed seat second section 104 in sequence from top to bottom, the matching hole 11 is arranged at the fixed seat first section 103, the elastic annular protrusion 12 is arranged at the fixed seat second section 104, and the width of the fixed seat second section 104 deviating from the elastic annular protrusion 12 is less than the width of the fixed seat first section 103.

[0024] When the positioning of the tubular part is needed, the external force is first applied to the movable column to make the movable column overcome the elastic force of the spring, so that the ball is withdrawn, then the section of the tubular part with the inner annular protrusion is inserted on the movable column and located on the support table, finally the force applied to the movable column is cancelled, the movable column moves axially under the action of the spring and pushes all the balls out, so that the outer surface of the ball is in abutment with the axial surface of the inner annular protrusion of the tubular part; at the same time, the elastic annular protrusion on the fixed seat is in abutment with the inner wall of the tubular part, and finally the positioning and fixing of the tubular part are realized.

[0025] The embodiment has the advantages of being able to guarantee the positioning coaxial precision and the positioning and fixing stability of the tubular part with the inner protruding ring at the end.

Claims

1. A positioning mechanism for a tubular member having an inner annular protrusion at one end, comprising a fixing seat having an inner cavity, a support platform extending circumferentially outward at a position offset from the end of the fixing seat and used to support the tubular member, a movable column and a plurality of spheres being disposed in the inner cavity, and the fixing seat having a plurality of mating holes arranged annularly and spaced apart and extending therethrough, characterized in that: The movable column is matched with a spring, the movable column has a tendency to move to one side of the axial direction under the action of the spring and makes the ball part be pushed out of the matching hole, the fixed seat has a support platform extending to the outer side of the circumference at the deviated end, the fixed seat also has an elastic annular protrusion extending to the outer side of the circumference, the elastic annular protrusion and the matching hole are located on the same side of the support platform, and the outer wall of the elastic annular protrusion gradually extends to the outer side of the circumference from the side far away from the support platform to the side close to the support platform.

2. The positioning mechanism for a tubular having an internal annular protrusion at one end as defined in claim 1, wherein: The inner cavity sequentially includes a thin section and a wide section along the axial direction of the movable column, the ball is located in the thin section, the movable column has an extension extending to the outer side of the circumference, the extension is always located in the wide section, and the two ends of the spring are in contact with the extension and the wide section respectively.

3. The locating mechanism for a tubular having an internal annular protrusion at one end as defined in claim 1, wherein: The movable column has a matching groove in the form of an annular ring on the outer wall in the circumferential direction, the groove surface includes a first matching section and a second matching section along the axial direction, the diameter of the first matching section gradually increases from the side close to the second matching section to the side far away from the second matching section, and the diameter of the second matching section gradually increases from the side close to the first matching section to the side far away from the first matching section.

4. The locating mechanism for a tubular having an internal annular protrusion at one end as defined in claim 1, wherein: The number of the elastic annular protrusions is at least two, and the at least two elastic annular protrusions are arranged at intervals along the axial direction of the movable column.

5. The locating mechanism for a tubular having an internal annular protrusion at one end as defined in claim 1, wherein: The part of the fixed seat located on one side of the support platform sequentially includes a first fixed seat section and a second fixed seat section along the axial direction, the matching hole is arranged at the first fixed seat section, the elastic annular protrusion is arranged at the second fixed seat section, and the first fixed seat section is farther away from the support platform than the second fixed seat section.

6. The locating mechanism for a tubular having an internal annular protrusion at one end as defined in claim 5, wherein: The width of the second fixed seat section deviated from the elastic annular protrusion is smaller than the width of the first fixed seat section.

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