Tool for measuring inner diameter of ring groove

Abstract

The utility model discloses a ring groove inner diameter measuring tool, which comprises a dial indicator, an adjusting rod and a connecting piece used for connecting the dial indicator and the adjusting rod, a measuring rod of the dial indicator and the adjusting rod are coaxially arranged, a detection end of the measuring rod and an abutting end of the adjusting rod are oppositely arranged, and the distance between the detection end of the measuring rod and the abutting end of the adjusting rod is matched with the inner diameter of a ring groove. According to the utility model, a shallower annular groove on the open end of a large-specification tubular component can be measured, the precision is high, and the cost is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to diameter detection technical field, specifically relates to a ring groove inner diameter measurement frock. BACKGROUND

[0002] In the machining process, the opening end of the tubular part often needs to be machined with a stepped ring groove to adapt to the installation of the sealing ring. After machining, the inner diameter size of the groove needs to be detected to ensure that it meets the tolerance requirements.

[0003] The conventional detection of the inner diameter generally uses an inner diameter dial gauge, which is composed of an inner measuring lever type measuring frame and a dial gauge, and is a commonly used measuring tool for measuring the inner hole by using a relative method. The main body of the measuring frame is a dial stem, the distal end of which is provided with a measuring rod connecting seat, and the two ends of the seat body are respectively provided with a movable measuring head and a fixed measuring head: the movable measuring head is connected to the inner lever through an elastic mechanism, and the displacement is transmitted to the dial gauge after amplification; the fixed measuring head serves as a measuring fulcrum, and the length is adjustable to match different hole diameters. When it is applicable to large-sized tubular parts, an external extension rod can be connected.

[0004] When measuring the inner diameter of the ring groove of a large-sized tubular part, the axial depth of the ring groove on some tubular parts is relatively deep, and the inner diameter dial gauge can be used for measurement. However, the depth of the ring groove on some tubular parts is relatively shallow (for example, 6mm < depth < 10mm). When the axial depth of the ring groove is relatively shallow, the outer diameter of the measuring rod connecting seat is generally greater than 20mm, which causes the outer edge to easily contact the original inner wall surface of the tubular part to form physical interference, so that the movable measuring head cannot effectively abut against the inner diameter measuring surface of the ring groove due to insufficient stroke, thereby failing to obtain effective data, resulting in failure to measure. Only indirect methods (such as caliper estimation or three-coordinate measuring machine) can be used, but such methods either have low precision, which easily leads to leakage or interference fit failure after the installation of the sealing ring, or have high cost, which is not suitable for production detection. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a ring groove inner diameter measuring frock, which can measure the ring groove with a relatively shallow depth on the opening end of a large-sized tubular part, has high precision and low cost.

[0006] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of a ring groove inner diameter measuring frock, which comprises a dial gauge, an adjusting rod and a connecting piece for connecting the two, the dial stem of the dial gauge is coaxially arranged with the adjusting rod, the detection end of the dial stem is arranged opposite to the abutting end of the adjusting rod, and the distance between the two is adapted to the inner diameter of the ring groove.

[0007] In a further improved scheme of the utility model, the connecting piece is a connecting ring, and the dial head of the dial gauge is located in the ring opening of the connecting ring.

[0008] The utility model disc further improve scheme is, the both sides symmetry of measuring rod is equipped with auxiliary rod, the axis of measuring rod and two auxiliary rods are in the same plane.

[0009] The utility model disc further improve scheme is, the abutting end of two auxiliary rods and the detection end of measuring rod are on same circle.

[0010] The utility model disc further improve scheme is, the abutting end of auxiliary rod is spring loaded head.

[0011] The utility model disc further improve scheme is, the axis of two auxiliary rods and the axis of measuring rod meet in a point, and the point is the center of ring groove.

[0012] The utility model disc further improve scheme is, the abutting end of adjusting rod is abutting ball.

[0013] The utility model disc further improve scheme is, be equipped with external thread on adjusting rod, be equipped with screw hole on connecting piece, and adjusting rod is connected in screw on connecting piece.

[0014] The utility model has the advantages of:

[0015] The utility model discloses the measuring rod and adjusting rod of dial gauge are coaxial arrangement, and the detection end of measuring rod and the abutting end of adjusting rod are arranged in opposite directions, and the spacing of two is adapted to the inner diameter of ring groove, and the diameter of two is 2-5mm through the cooperation of measuring rod and adjusting rod, can measure the ring groove of the opening end of large specification tubular part, and the precision is higher and the cost is lower.

[0016] In the utility model, two auxiliary rods and measuring rod are coplanar and the axis meets in the center, even if the operator does not apply force uniformly, still can guarantee that the measuring head is perpendicular to the groove wall, reduces the positioning time of manual swing measuring rod, improves detection efficiency.

[0017] The abutting end of the adjusting rod of the utility model is abutting ball, and the spherical surface contact reduces friction resistance, is convenient for swing measuring rod, and the inner diameter measurement surface point is contacted, and the influence on swing is reduced. DRAWINGS

[0018] Fig. 1 It is the structure overhead schematic view of embodiment 1 of the utility model.

[0019] Fig. 2 It is the structure overhead schematic view of embodiment 2 of the utility model.

[0020] Fig. 3 It is the position relation schematic view of ring groove when using embodiment 2 of the utility model.

[0021] In the figure, 1 - dial indicator, 2 - adjusting rod, 3 - connecting piece, 4 - measuring rod, 5 - auxiliary rod, 6 - abutting ball, 7 - tubular part, 8 - ring groove. DETAILED DESCRIPTION

[0022] The utility model is further illustrated below in combination with the drawings and specific embodiments.

[0023] Embodiment 1: in combination Figs. 1-3 It can be known that the ring groove inner diameter measuring tool comprises a dial indicator 1, an adjusting rod 2 and a connecting piece 3 for connecting the two, the measuring rod 4 of the dial indicator 1 is coaxially arranged with the adjusting rod 2, the detection end of the measuring rod 4 is arranged opposite to the abutting end of the adjusting rod 2, and the spacing between the two is adapted to the inner diameter of the ring groove. Preferably, the diameters of the measuring rod 4 and the adjusting rod 2 are 2-4 mm.

[0024] The connecting piece 3 is a connecting ring, and the dial head of the dial indicator 1 is located in the ring mouth of the connecting ring. Preferably, the axial directions of the measuring rod 4 and the adjusting rod 2 are consistent with the radial direction of the connecting ring.

[0025] The abutting end of the adjusting rod 2 is a taper head or an abutting ball. Preferably, it is an abutting ball 6.

[0026] The adjusting rod 2 is provided with external threads, the connecting piece 3 is provided with a threaded hole, and the adjusting rod 2 is threadedly connected to the connecting piece 3. The connecting ring is provided with a through hole, and a locking bolt communicating with the through hole is threadedly connected to the connecting ring. The measuring rod 4 is slidingly connected in the through hole and locked by the locking bolt.

[0027] Embodiment 2: in combination Fig. 2 , 3 It can be known that this embodiment is based on the structure of embodiment 1 and makes changes to the structure in embodiment 1. The changed technical solution is:

[0028] Two auxiliary rods 5 are symmetrically arranged on both sides of the measuring rod 4, and the axes of the measuring rod 4 and the two auxiliary rods 5 are located in the same plane. The fixing mode of the auxiliary rod 5 is the same as that of the measuring rod 4.

[0029] The abutting ends of the two auxiliary rods and the detection end of the measuring rod 4 are located on the same circle.

[0030] The abutting end of the auxiliary rod 5 is a spring-loaded head. Elastic contact compensation avoids scratching the sealing surface by hard contact, and provides constant contact force.

[0031] The axes of the two auxiliary rods 5 and the axis of the measuring rod 4 intersect at a point, which is the center of the ring groove.

[0032] The other structures of this embodiment are the same as those of embodiment 1, which will not be repeated here.

[0033] The working principle of the embodiment 1 of the ring groove inner diameter measuring tool is as follows: in use, first, the zero position is calibrated by using a micrometer or a ring gauge, the abutting ball 6 of the adjusting rod 2 is abutted against the inner diameter measuring surface of the ring groove 8, the measuring rod 4 is abutted against the inner diameter measuring surface of the ring groove 8, the measuring rod 4 is manually swung to find the maximum point of the reading of the dial gauge 1 (i.e. the state that the axis of the measuring rod 4 is radially coincident with the ring groove 8), at this time, the measurement value is the true inner diameter, whether the measurement fluctuation is within the tolerance range is observed, if within the range, it is qualified, otherwise, it is qualified.

[0034] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application, any equivalent structure or equivalent process conversion made by using the content of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A ring groove inner diameter measuring tool characterized by: The application relates to a dial gauge (1), an adjusting rod (2) and a connecting piece (3) for connecting the two, the measuring rod (4) of the dial gauge (1) is coaxially arranged with the adjusting rod (2), the detection end of the measuring rod (4) is arranged opposite to the abutting end of the adjusting rod (2), and the distance between the two is matched with the inner diameter of the ring groove.

2. The ring groove inner diameter measuring tool of claim 1, wherein: The connecting piece (3) is a connecting ring, and the dial head of the dial gauge (1) is located in the ring opening of the connecting ring.

3. The ring groove inner diameter measuring tool of claim 1, wherein: The two sides of the measuring rod (4) are symmetrically provided with auxiliary rods (5), and the axes of the measuring rod (4) and the two auxiliary rods (5) are located in the same plane.

4. The ring groove inner diameter measuring tool of claim 3, wherein: The abutting ends of the two auxiliary rods are located on the same circle as the detection end of the measuring rod (4).

5. The ring groove inner diameter measuring tool of claim 3, wherein: The abutting end of the auxiliary rod (5) is a spring-loaded head.

6. The ring groove inner diameter measuring tool of claim 3 or 4, wherein: The axes of the two auxiliary rods (5) and the axis of the measuring rod (4) intersect at a point, which is the center of the ring groove.

7. The ring groove inner diameter measuring tool of claim 1, wherein: The abutting end of the adjusting rod (2) is an abutting ball (6).

8. The ring groove inner diameter measuring tool of claim 1, wherein: The adjusting rod (2) is provided with external threads, the connecting piece (3) is provided with a threaded hole, and the adjusting rod (2) is threadedly connected to the connecting piece (3).

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