CN105043208A - Groove width measuring device - Google Patents

Abstract

The invention discloses a groove width measuring device. The groove width measuring device comprises a measuring handle and a measuring core shaft in guiding movable arrangement in the measuring handle. An elastic component is arranged between the measuring handle and the measuring core shaft. The measuring core shaft is connected with a movable claw extending along the radial direction thereof. The measuring handle is provided with a fixed claw. The fixed claw comprises a connection portion connected with the measuring handle and a measuring portion used cooperatively with the movable claw and extending along the radial direction of the measuring handle. The opposite sides of the measuring portion of the fixed claw and the movable claw are respectively provided with a matching surface in close fit with the corresponding groove wall during measuring. Measurement reference of the measuring device is two groove wall surfaces of an inner ring groove, and the two groove wall surfaces are refined reference surfaces and provide reference to each other. Compared with the prior art, the measuring error is small, and the precision of the measured groove width value is higher.

Description

Groove width measuring device

technical field

The invention relates to the field of measuring tools, in particular to a groove width measuring device.

Background technique

In the field of mechanical processing, some parts need to process the inner ring groove, and the width of the inner ring groove requires high precision. As shown in FIG. 1 , it is a structural diagram of a conventional part processed with an inner ring groove. The inner ring groove 101 of the part 100 is set in a hole 102 . If the hole depth of the part is large, it is inconvenient or even impossible to measure the width of the inner ring groove with a vernier caliper.

For the problem of the difficulty in measuring the groove width of the inner ring groove in the above-mentioned deep hole, Chinese patent CN203349732U (announcement date is 2013.12.18) discloses a tool for measuring the axial position and groove width of the inner ring groove in the deep hole. A measuring handle that extends into the deep hole, and one end of the measuring handle is provided with a mounting seat for installing a measuring gauge. There is a through hole coaxial with it in the measuring handle, and a measuring mandrel is fitted in the through hole to slide and fit with it. There is a shaft shoulder on the measuring mandrel, and a spring set on the measuring mandrel is arranged between the shoulder and the mounting seat. . A measuring gauge is arranged on the mounting seat, and the measuring head of the measuring gauge leans against the end surface of the measuring mandrel. The outer peripheral wall of the measuring handle is provided with a through groove whose side wall is parallel to its axis. The notch of the through groove is located on the end face of the measuring handle away from the mounting seat. The upper part is provided with a flange extending radially outward and used to cooperate with the inner ring groove during measurement.

The measurement process of the above-mentioned measuring tool is as follows: when measuring, pinch the measuring claw with your hand so that the measuring claw can enter the deep hole of the workpiece. When the measuring claw reaches the inner ring groove of the workpiece, release the measuring claw and let the measuring claw get stuck in the inner ring groove Inside. At this time, the measuring mandrel is under the action of the spring, and its end away from the measuring gauge is against the bottom of the deep hole. Move the measuring handle axially, and then drive the measuring gauge to move relative to the measuring mandrel. The upper and lower end surfaces of the measuring jaws are in contact with the upper and lower end surfaces of the inner ring groove of the part to obtain two readings. The difference between these two readings is taken as the width of the inner ring groove of the part. measured value. During the measurement process, whether the upper end surface of the measuring claw is in contact with the upper end surface of the inner ring groove or the lower end surface of the measuring claw is in contact with the lower end surface of the inner ring groove, the readings obtained are all based on the bottom of the deep hole. The bottom of the deep hole is a rough reference. Therefore, the readings obtained by the two measurements are all values with low accuracy. The value is not accurate. Moreover, the measuring tool is limited by its measuring principle, so that it cannot measure the width of the inner ring groove in the through hole, and the through hole cannot provide a stop surface for the end of the measuring mandrel away from the measuring gauge.

Contents of the invention

The object of the present invention is to provide a groove width measuring device to solve the technical problem of large measurement errors of existing groove width measuring tools.

In order to achieve the above object, the groove width measuring device of the present invention adopts the following technical scheme: the groove width measuring device includes a measuring handle and a measuring mandrel that guides and moves on the measuring handle, and the distance between the measuring handle and the measuring mandrel is There is an elastic piece between them, the measuring mandrel is connected with a movable claw extending radially, the measuring handle is provided with a fixed claw, and the fixed claw includes a connecting part connected with the measuring handle and a connecting part connected with the measuring handle. The measuring part that is used in conjunction with the movable claw and extends radially along the measuring handle. The measuring part of the fixed claw and the opposite side of the movable claw have a fit that closely fits with the corresponding groove wall during measurement. noodle.

The measuring handle has a mounting hole penetrating in its axial direction, the measuring mandrel is located in the mounting hole, the outer wall of the measuring handle is provided with a limit hole, and the end of the movable claw far away from the measuring mandrel protrudes from the The limit hole and the movable claw can move along the axial direction of the measuring handle in the limit hole, and the movable claw abuts against one end of the limit hole under the action of the elastic member.

The movable jaw is detachably connected to the measuring mandrel by a fastener, and the measuring handle is provided with a corresponding process hole for the fastener to pass through.

The end of the movable claw and/or the measuring part away from the measuring mandrel is provided with a guide structure that facilitates the movable claw and/or the measuring part to extend into the groove to be measured during measurement.

The guide structure is formed by a bevel at the end of the movable jaw and/or the measuring portion.

The connecting portion of the fixing claw is in the shape of a sleeve, the fixing claw is movably sleeved on the measuring handle, and the fixing claw also has a locking portion for fixing the connecting portion on the measuring handle.

The connecting portion of the fixed claw is provided with a relief hole for the movable claw to make way for when the movable claw moves along the axial direction of the measuring handle.

An anti-rotation positioning surface for anti-rotation of the fixed pawl is provided on the outer periphery of the measuring handle.

The measuring handle has a mounting hole extending along its axial direction, and the measuring mandrel is guided to move and fit in the mounting hole of the measuring handle.

The elastic member is a spring, and the spring is located in a mounting hole at the end of the measuring handle that is away from the end used to install the measuring gauge. One end of the spring is press-fitted with one end of the measuring mandrel.

Beneficial effects of the present invention: when the groove width measuring device of the present invention is in use, one end of the measuring handle provided with the fixed claw and the movable claw is inserted into the hole of the workpiece, so that both the fixed claw measuring part and the movable claw extend into the hole of the workpiece In the inner ring groove. One side of the movable claw with a matching surface is pressed against one side wall of the inner ring groove under the force of the elastic member, and one side of the fixed claw with a matching surface is pressed against the other side wall of the inner ring groove. The use of elastic parts can ensure that the corresponding mating surfaces of the measuring part of the fixed claw and the movable claw can be tightly pressed against the two side walls of the inner ring groove, avoiding the error caused by manpower control of the distance between the movable claw and the fixed claw. The measurement reference of the measuring device is the two groove wall surfaces of the inner ring groove, and the two groove wall surfaces are precise reference planes, which are mutual references. Compared with the prior art, the measurement error is small, and the measured value of the groove width is accurate. higher.

Description of drawings

Fig. 1 is a structural representation of a part processed with an inner ring groove;

Fig. 2 is the structural representation of the embodiment of groove width measuring device of the present invention;

Fig. 3 is an enlarged view of A place in Fig. 2;

Figure 4 is a front view of the measuring mandrel in Figure 2;

Figure 5 is a top view of Figure 4;

Fig. 6 is a schematic structural view of the measuring handle in Fig. 2;

Fig. 7 is a sectional view of Fig. 6;

Fig. 8 is a front view of the fixed claw in Fig. 2;

Fig. 9 is the bottom view of Fig. 8;

Fig. 10 is a B-B sectional view of Fig. 8;

Fig. 11 is a schematic structural view of the movable claw in Fig. 2 .

Detailed ways

An embodiment of a groove width measuring device of the present invention is shown in Figure 2-11: the measuring device includes a measuring handle 1 extending in the left and right direction and a measuring mandrel 8 guided and moved in the mounting hole 17 of the measuring handle 1, The mounting hole 17 of the measuring handle 1 is a through hole penetrating in the left-right direction. The right end of the measuring handle 1 is provided with an installation part 11 for installing the dial indicator. The installation part 11 is provided with an installation groove 16 communicating with the installation hole. The side wall of the installation part is provided with a screw hole, and the dial indicator 10 is inserted into the installation groove. and fixed by fastening screws 12. The measuring head 13 of the dial gauge 10 abuts against the right end face of the measuring mandrel 8 . A handle 9 is set on the left side of the dial gauge 10 on the measuring handle 1 .

A limit hole 14 is provided on the outer wall of the end of the measuring handle 1 away from the dial gauge 10 for installation. The limit hole 14 is a long hole whose length in the left and right direction is greater than its length along the peripheral direction of the measuring handle 1 . The measuring mandrel 8 is connected with a movable claw 7, and the end of the movable claw 7 away from the measuring mandrel 8 extends out of the limiting hole 14 along the radial direction of the measuring mandrel 8 and the movable claw 7 can be in the limiting hole 14 Move left and right. The measuring mandrel 8 is provided with a perforation 81 , one end of the movable claw 7 is inserted into the perforation 81 , and the other end extends out of the limiting hole 14 . The side wall of the measuring mandrel 8 is also provided with a mandrel pin hole 82 communicating with the perforation, and one end of the movable claw 7 inserted into the perforation is provided with a movable claw pin hole 72 corresponding to the mandrel pin hole. The movable jaw 7 is detachably connected to the measuring mandrel 8 through the pin 6, and the measuring handle 1 is provided with a corresponding process hole 15 for the pin to pass through. In the mounting hole 17 of the measuring handle 1 is also installed a spring 5 for pressing the measuring mandrel and making the movable claw lean against the right end of the limit hole. The spring 5 is on the left side of the measuring mandrel 8 . The left end of the measuring handle 1 is sealed with a screw pin 4, the spring 5 is sleeved on the screw pin 4, the left end of the spring 5 leans against the stepped surface of the screw pin, and the other end of the spring 5 is press fit with the left end of the measuring mandrel 8. The left end of the measuring mandrel 8 is provided with an escape hole 83, which is a blind hole to avoid interference with the screw pin 4 when the measuring mandrel moves leftward.

The measuring handle 1 is provided with a fixed claw 2 at the limit hole 14 , the fixed claw 2 includes a sleeve-shaped fixed claw body 23 , and the fixed claw body 23 serves as a connecting portion connected with the measuring handle 1 . The fixed claw 2 has a measuring portion 22 extending radially along the measuring handle and used in cooperation with the movable claw, and the fixed claw also has a locking portion 21 for fixing it on the measuring handle. The locking part 21 is a boss extending radially outwards. The locking part is provided with a screw hole 25 penetrating to the outer peripheral surface of the measuring handle. The fixed claw 2 is movably sleeved on the outer circumference of the measuring handle 1. A plane 18 is provided at the screw hole, and the fixed claw 2 is fixed on the measuring handle by the set screw 3 . The set screw 3 is tightened on the plane of the outer circumference of the measuring handle, which can prevent the fixed claw 2 from rotating. The measuring part 22 is a U-shaped groove structure with an opening facing left. The fixed claw body 23 is provided with a relief hole 24 for moving the movable claw in the left and right directions. The bottom wall of the groove.

The measuring portion 22 of the fixed claw 2 and the opposite side of the movable claw 7 leave a set gap during measurement, and the measuring portion of the fixed claw and the opposite side of the movable claw all have groove walls corresponding to the corresponding groove walls during measurement. Snug fit mating surfaces. One end of the movable claw and the fixed claw far away from the measuring mandrel is provided with a guide structure 71 that facilitates the insertion of the movable claw and the fixed claw into the groove to be measured during measurement. The guiding structure 71 is formed by the slopes at the ends of the corresponding movable and fixed claws.

When the groove width measuring device of this embodiment is in use, first loosen the set screw 3, adjust the position of the fixed claw 2 on the axial direction of the measuring handle 1, so that the distance between the fixed claw measuring part and the opposite sides of the movable claw is The distance is slightly larger than the groove width to be measured, and then tighten the set screw 3 to fix the fixed claw. Insert the measuring part 22 of the fixed claw 2 and the movable claw 7 between the two side walls of the calibration gauge, rotate the measuring handle 1, and the fixed claw and the movable claw will rotate together with the measuring handle. Under the force applied to the movable claw by the side wall of the calibration gauge, the distance between the movable claw 7 and the fixed claw 2 in the axial direction will change, and the movable claw 7 drives the measuring mandrel 8 to move back and forth in the left and right directions, and the dial indicator The pointer of 10 will also swing back and forth, and the 10 pointer of the dial indicator will be zeroed at the minimum position. After zero alignment, extend the end of the fixed claw and the movable claw into the hole of the workpiece, and when the movable claw 7 moves to the inner ring groove of the workpiece, apply a little force in the radial direction. The pawls are provided with a guide structure 71, so that the measuring portion of the fixed pawl and the movable pawl are relatively easy to stretch into the inner ring groove. The side of the movable claw with the mating surface is pressed against one side wall of the inner ring groove under the force of the spring 5, and the side of the fixed claw 2 with the mating surface is pressed against the other side wall of the inner ring groove . Under normal conditions, the movable claw 7 and the measuring mandrel 8 always maintain a tendency of moving to the right, and the movable claw is tightly mounted on the right end of the limiting hole. When the measuring handle is rotated, the measuring parts of the movable claw and the fixed claw rotate in the inner ring groove. When the movable claw 7 is subjected to the leftward force of the groove wall, the movable claw 7 will drive the measuring mandrel 8 to move to the left together. The movable pawl 7 moves in the position-limiting hole 14 of the elongated hole type. When losing the active force to the left, under the action of the spring 5, the measuring mandrel 8 moves to the right, and the movable claw 7 moves to the right following the measuring mandrel 8. During the process of the measuring mandrel moving back and forth, the pointer of the dial indicator will swing back and forth under the action of the measuring mandrel to achieve the purpose of measurement. The minimum reading of the pointer of the dial indicator is the actual size of the groove width of the inner ring groove of the workpiece. The measurement reference of the measuring device is the two groove wall surfaces of the inner ring groove, and the two groove wall surfaces are precise reference planes, which are mutual references. Compared with the prior art, the measurement error is small, and the measured value of the groove width is accurate. higher. Moreover, the measuring device of the present invention is not limited to measuring the groove width of the inner ring groove in the blind hole, but can also measure the groove width of the inner ring groove in the through hole, so the application range is wider.

In this embodiment, the mounting hole of the measuring handle is set as a through hole, and a screw pin for blocking the through hole is set at the left end of the measuring handle to facilitate the disassembly and assembly of the measuring mandrel; in other embodiments, the mounting hole can also be set as a through hole. Form a blind hole closed at the left end, and place the spring at the left end in the mounting hole.

In other embodiments, the spring can also be arranged on the measuring mandrel to the right of the movable claw, and a shoulder is set on the measuring mandrel, the spring is located on the right of the shoulder, and on the measuring mandrel to the right of the spring A shaft sleeve is sheathed, and the measuring head of the dial indicator passes through the shaft sleeve and abuts against the end surface of the measuring mandrel. The spring is in the normal state between the shaft shoulder and the bushing, and the spring is in a compressed state. Under the action of the spring, the movable claw is pressed against the left end of the limit hole. At this time, the measuring part of the fixed claw is located on the right side of the movable claw.

In other embodiments, the connection between the movable claw and the measuring mandrel can also be done by gluing, and the pin can also be replaced by a screw.

In this embodiment, the elastic member adopts a coil spring. In other embodiments, the elastic member can be a rubber spring, and the elastic member can also be an elastic body made of a polymer material; The activity gap is small, and in other embodiments, elastic washers can also be used; or a torsion spring can be used.

In this embodiment, the fixed claw body of the fixed claw adopts a sleeve-shaped structure, and the fixed claw is sleeved on the measuring handle, which is convenient for adjusting the axial position of the fixed claw on the measuring handle, and is also convenient for fixing its position by screws; The claw body is made into a sleeve-like structure, and the relief hole set on the fixed claw body needs to be made U-shaped, that is, the right end of the relief hole is connected with the right end face of the fixed claw body, so as to ensure the installation and fixation in the axial direction. The movable claw can enter into the give way hole of the fixed claw when clawing. In other embodiments, the fixed claw body of the fixed claw can be made into an arc shape, and the radius of the fixed claw body is adapted to the measuring handle; if the fixed claw can be installed on the measuring handle along the radial direction of the measuring handle, then let The right end of bit hole can not be through with the right end face of fixed jaw body, but the bit hole is a long hole, to satisfy movable jaw to move back and forth in the axial direction of measuring handle.

In this embodiment, the purpose of making the fixed claw movable is to enable the measuring device of the present invention to be suitable for inner ring grooves with different groove widths. According to the difference in groove width, the fixed claw is adjusted in advance relative to the movable claw. position; in other embodiments, if it is for the measurement of an inner ring groove with a groove width, the fixed claw can be made into a fixed type, and corresponding screw holes are set on the outer circumference of the measuring handle, and the fixed claw is fixed on the measuring handle by screws. on the handle, so that its position cannot be adjusted, and there is no need to set a plane on the outer circumference of the measuring handle, and the fixed claw cannot rotate; the fixed claw can also be welded and fixed on the measuring handle to fix its position; or the fixed claw can be connected to the measuring handle with a pin On the handle, a corresponding pin hole is provided on the locking part, and a through hole corresponding to the pin hole is provided on the outer circumference of the measuring handle.

In this embodiment, a plane is set on the outer circumference of the measuring handle as the anti-rotation positioning surface to prevent the fixed claw from rotating relative to the measuring handle; in other embodiments, two planes can also be provided; in other embodiments, In order to prevent the fixed claw from rotating, a key connection method can also be used, and the fixed claw and the measuring handle are connected through a key to realize anti-rotation.

In other embodiments, the guide structure can be provided only on the measuring portion of the movable claw or the fixed claw, and the guide structure is not limited to the slope, and the guide structure can also be formed by a conical surface.

In other embodiments, for the inner ring groove that requires higher precision, a dial gauge can be used as a measuring gauge to replace the dial gauge.

In this embodiment, the measuring mandrel is assembled in the installation hole in the measuring handle, so that the volume of the entire measuring device is small, and it is convenient to insert into the workpiece with small aperture; in other embodiments, the measuring handle may not be provided with a through installation A guide structure is arranged on the outer wall of the measuring handle, the measuring mandrel is guided and assembled on the guiding structure on the measuring handle, and the measuring mandrel is arranged parallel to the measuring handle.

Claims (10)

1. groove width measurement mechanism, comprise and measure handle and guiding movement and be assemblied in air plug gauge on described measurement handle, it is characterized in that: between described measurement handle and described air plug gauge, be provided with elastic component, described air plug gauge is connected with the movable claw radially extended, described measurement handle is provided with fixed claw, described fixed claw comprise the connecting portion that is connected with described measurement handle and with described movable claw with the use of, along the measurement section measuring the extension of handle radial direction, the measurement section of described fixed claw all has the mating surface of cell wall snug fit when measuring and corresponding to the opposing side of described movable claw.

2. groove width measurement mechanism according to claim 1, it is characterized in that: described measurement handle has along its axially through mounting hole, described air plug gauge is positioned at mounting hole, described measurement handle lateral wall is provided with spacing hole, one end away from air plug gauge of described movable claw stretches out described spacing hole and movable claw can move along measuring handle axial direction in spacing hole, and described movable claw is resisted against one end of described spacing hole under the effect of elastic component.

3. groove width measurement mechanism according to claim 1, is characterized in that: described movable claw and described air plug gauge are by securing member releasable connection, and described measurement handle is provided with the fabrication hole that the corresponding described securing member of confession passes through.

4. groove width measurement mechanism according to claim 1, is characterized in that: one end away from described air plug gauge of described movable claw and/or measurement section is provided with to be convenient to movable claw and/or measurement section and to extend into guide frame in groove to be measured when measuring.

5. groove width measurement mechanism according to claim 4, is characterized in that: described guide frame is formed by the inclined-plane of the end of movable claw and/or measurement section.

6. groove width measurement mechanism according to claim 1, it is characterized in that: the connecting portion of described fixed claw is sleeve-shaped, described fixed claw is movably set on described measurement handle, and described fixed claw also has the lock part be fixed on by described connecting portion on described measurement handle.

7. groove width measurement mechanism according to claim 6, is characterized in that: the connecting portion of described fixed claw is provided with the resigning hole of stepping down when moving along described measurement handle axial direction to described movable claw.

8. groove width measurement mechanism according to claim 6, is characterized in that: described measurement handle periphery is provided with for the spline locating surface to described fixed claw spline.

9. groove width measurement mechanism according to claim 1, is characterized in that: described measurement handle has the mounting hole extended along its axial direction, and described air plug gauge guiding movement is assemblied in the mounting hole of described measurement handle.

10. groove width measurement mechanism according to claim 9, it is characterized in that: described elastic component is spring, described spring be positioned at described measurement handle away from it for installing and measuring one end mounting hole of table, press fit is pushed up in one end of described spring and one end of described air plug gauge.