CN112902941A - Portable telescopic positioning rod for measurement and use method thereof - Google Patents

Abstract

The invention provides a portable telescopic positioning rod for measurement and a using method thereof. The portable flexible locating lever for measurement includes: the telescopic groove is formed in one end of the fixing rod, and two limiting sliding grooves are formed in the fixing rod. The portable telescopic positioning rod for measurement provided by the invention has the advantages that when the portable telescopic positioning rod is in an initial state, the two groups of first magnets correspond to the two groups of limiting magnetic plates and are mutually adsorbed, so that the telescopic rod in a folded state can be conveniently adsorbed, the stability of the telescopic rod after being folded is kept, the adsorption between the limiting magnetic plates and the two groups of second magnets is ensured, the stability of the telescopic rod after being completely unfolded is ensured, the instability of measurement data caused by looseness or shrinkage in the measurement process is avoided, the use is convenient and fast, the movable telescopic rod is not required to be manually controlled, the circle center positions of two circles at different positions can be conveniently confirmed and positioned by the first positioning ring and the second positioning ring, and the circle center distance of the two circles can be conveniently and rapidly positioned.

Description

Portable telescopic positioning rod for measurement and use method thereof

Technical Field

The invention relates to the technical field of measuring tools, in particular to a portable telescopic positioning rod for measurement and a using method thereof.

Background

The locating lever is used for measuring in the equipment course of working more than, and the locating lever adopts the extending structure of movable rod and fixed link more to increase the measuring distance and the location distance of locating lever, the structure of shrink simultaneously can reduce the area occupied of locating lever when not using, and convenient to use is convenient.

In prior art, when current measuring locating lever is in the time of carrying out flexible regulation, the activity pole is received and is easily sent out the life behind the fixed link inside and move and the operation among the inconvenient in-service use process, and the in-process activity pole of using is easily become flexible and break away from the inside of fixed link to influenced the stability of actual measurement process, brought unnecessary trouble for the measurement, and the locating lever is inconvenient location and measurement when measuring the centre of a circle of two circles.

Therefore, it is necessary to provide a portable telescopic positioning rod for measurement and a method for using the same to solve the above technical problems.

Disclosure of Invention

The invention provides a portable telescopic positioning rod for measurement, which solves the problem that a movable rod and a fixed rod are easy to loosen and inconvenient to use.

In order to solve the above technical problem, the present invention provides a portable telescopic positioning rod for measurement, comprising: the fixing device comprises a fixing rod, a first sliding hole and a second sliding hole, wherein one end of the fixing rod is provided with a telescopic groove, two limiting sliding grooves are formed in the fixing rod, the other end of the fixing rod is provided with an adjusting groove, and the fixing rod is provided with the first sliding hole; the bottom of the measuring scale is fixed on the upper surface of the fixing rod; the adjusting disc is arranged inside the adjusting groove, a linkage shaft is fixedly connected to the axis of the adjusting disc, a linkage disc is fixedly connected to one end of the linkage shaft, and two first magnets are arranged on the surface of the linkage disc; the surface of the telescopic rod is connected to the inner surface of the telescopic groove in a sliding mode, two sides of the surface of the telescopic rod are fixedly connected with limiting magnetic plates, one side of the inner wall of each of the two limiting sliding grooves is fixedly connected with a second magnet, and the telescopic rod is provided with a second sliding hole; the bottom of the extension ruler is fixed on the surface of the telescopic rod; the surface of the first sliding block is connected to the inner surface of the second sliding hole in a sliding mode, and a first positioning ring is arranged on the first sliding block; the inner surface of the C-shaped connecting piece is connected with the outer surface of the fixing rod in a sliding mode, a second sliding block is fixedly connected to one side of the C-shaped connecting piece, a second positioning ring is arranged on the second sliding block, and a locking screw is arranged on the C-shaped connecting piece.

Preferably, the two limiting sliding grooves are symmetrically distributed on two sides of the telescopic groove, and the interiors of the two limiting sliding grooves are communicated with the interior of the telescopic groove.

Preferably, the inside of the first sliding hole is communicated with the inside of the telescopic groove, and the first sliding hole is of a vertically through structure.

Preferably, one end of the linkage shaft penetrates through the fixing rod and extends into the telescopic groove, and the surface of the linkage shaft is rotatably connected with the inner surface of the fixing rod.

Preferably, the two first magnets are symmetrically distributed on the surface of the linkage disc, and both the two first magnets are located at the non-center of the linkage disc.

Preferably, one end of the adjusting disc is fixedly connected with an indicator, and the position of the indicator is matched with the position of the first magnet.

Preferably, the surfaces of the two limiting magnetic plates are respectively in sliding connection with the inner surfaces of the two limiting sliding grooves, the surfaces of the two limiting magnetic plates are matched with the surfaces of the two first magnets, and the surfaces of the two second magnets are matched with the surfaces of the two limiting magnetic plates.

Preferably, the size of the second sliding hole is matched with the size of the first sliding hole, the second sliding hole is on the same vertical plane with the first sliding hole, the scale of the surface of the extension ruler is matched with the scale of the surface of the measuring ruler, and the measuring surface of the extension ruler is on the same vertical plane with the measuring surface of the measuring ruler.

Preferably, a triangular positioning indication groove is formed in the first positioning ring, the indication direction of the triangular positioning indication groove faces the direction of the scale of the extension ruler, the cross section of the first sliding block is of an I-shaped structure, the bottom of the second sliding block extends into the first sliding hole, the size of the second positioning ring is the same as that of the first positioning ring, and the outer surface of the second positioning ring is in sliding connection with the inner surface of the first sliding hole.

A use method of a portable telescopic positioning rod for measurement comprises the following steps:

s1, when the measured length of the fixed rod needs to be adjusted, the adjusting disc is preferentially rotated, the adjusting disc drives the linkage disc to rotate through the linkage shaft, the linkage disc drives the two groups of first magnets on the linkage disc to rotate, so that the two groups of first magnets and the two groups of limiting magnetic plates are staggered and separated, the telescopic rod can be freely stretched and pulled out in the telescopic groove at the moment, after the telescopic rod is completely pulled out, magnetic adsorption is carried out between the two groups of limiting magnetic plates on the telescopic rod and the two groups of corresponding second magnets, and therefore the stability of the telescopic rod after being unfolded is guaranteed;

s2, after the telescopic rod is fully extended, the measuring starting point of the extension ruler on the telescopic rod corresponds to the measuring end point of the measuring ruler, so that the continuity of the measured data is guaranteed, and the measured reading is convenient to carry out;

s3, when the distance between two circle centers needs to be drawn, the second positioning ring is preferentially fixed at the zero scale position on the fixed rod, the circle center of the second positioning ring is aligned to the circle center of the first circle, the distance between the first positioning ring and the second positioning ring is movably adjusted according to the use requirement, and the distance between the circle center of the first positioning ring and the circle center of the second positioning ring is the distance indicated by the first positioning ring, so that the circle center position of the required distance can be conveniently and quickly found.

Compared with the related art, the portable telescopic positioning rod for measurement provided by the invention has the following beneficial effects:

the invention provides a portable telescopic positioning rod for measurement, wherein two groups of first magnets correspond to two groups of limiting magnetic plates and are mutually adsorbed when in an initial state, so that a telescopic rod in a folded state can be conveniently adsorbed, the stability of the folded telescopic rod is kept, the limiting magnetic plates and two groups of second magnets are adsorbed, the stability of the telescopic rod after being completely unfolded is ensured, unstable measurement data caused by looseness or shrinkage in the measurement process is avoided, the portable telescopic positioning rod is convenient and rapid to use, the movable telescopic rod does not need to be manually controlled, the circle center positions of two circles with different positions can be conveniently confirmed and positioned by a first positioning ring and a second positioning ring, and the circle center distance of the two circles can be conveniently and rapidly positioned and measured.

Drawings

Fig. 1 is a schematic structural diagram of a preferred embodiment of a portable telescopic positioning rod for measurement according to the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged view of the portion B shown in FIG. 1;

FIG. 4 is a schematic structural view of the linkage plate portion shown in FIG. 2;

FIG. 5 is a schematic structural view of the telescoping pole section shown in FIG. 1;

FIG. 6 is a schematic structural view of the fixed rod portion shown in FIG. 1;

FIG. 7 is an enlarged view at C shown in FIG. 6;

FIG. 8 is a schematic structural view of the first slider portion shown in FIG. 5;

FIG. 9 is a schematic structural view of the second slider portion shown in FIG. 7.

Reference numbers in the figures: 1. the dead lever, 11, flexible groove, 12, spacing spout, 13, adjustment tank, 14, first sliding hole, 2, the dipperstick, 3, the adjustment disk, 31, the universal driving shaft, 32, the linkage disk, 321, first magnet, 33, the indicator, 4, the telescopic link, 41, spacing magnetic sheet, 42, second magnet, 43, second sliding hole, 5, extend the chi, 6, first sliding block, 61, first position circle, 7, C shape connecting piece, 71, second sliding block, 72, second position circle, 73, lock screw.

Detailed Description

The invention is further described with reference to the following figures and embodiments.

Please refer to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8 and fig. 9 in combination, wherein fig. 1 is a schematic structural diagram of a preferred embodiment of a portable telescopic positioning rod for measurement according to the present invention; FIG. 2 is an enlarged view of portion A of FIG. 1; FIG. 3 is an enlarged view of the portion B shown in FIG. 1; FIG. 4 is a schematic structural view of the linkage plate portion shown in FIG. 2; FIG. 5 is a schematic structural view of the telescoping pole section shown in FIG. 1; FIG. 6 is a schematic structural view of the fixed rod portion shown in FIG. 1; FIG. 7 is an enlarged view taken at A of FIG. 6; FIG. 8 is a schematic structural view of the first slider portion shown in FIG. 5; FIG. 9 is a schematic structural view of the second slider portion shown in FIG. 7. A portable telescopic positioning rod for measurement comprises: the fixing device comprises a fixing rod 1, wherein one end of the fixing rod 1 is provided with a telescopic groove 11, two limiting sliding grooves 12 are formed in the fixing rod 1, the other end of the fixing rod 1 is provided with an adjusting groove 13, and the fixing rod 1 is provided with a first sliding hole 14; the bottom of the measuring scale 2 is fixed on the upper surface of the fixing rod 1; the adjusting disc 3 is arranged inside the adjusting groove 13, a linkage shaft 31 is fixedly connected to the axis of the adjusting disc 3, one end of the linkage shaft 31 is fixedly connected with a linkage disc 32, and two first magnets 321 are arranged on the surface of the linkage disc 32; the surface of the telescopic rod 4 is connected to the inner surface of the telescopic groove 11 in a sliding manner, the two sides of the surface of the telescopic rod 4 are fixedly connected with limiting magnetic plates 41, one side of the inner wall of each of the two limiting sliding grooves 12 is fixedly connected with a second magnet 42, and the telescopic rod 4 is provided with a second sliding hole 43; an extension rule 5, wherein the bottom of the extension rule 5 is fixed on the surface of the telescopic rod 4; the surface of the first sliding block 6 is slidably connected with the inner surface of the second sliding hole 43, and a first positioning ring 61 is arranged on the first sliding block 6; the inner surface of the C-shaped connecting piece 7 is connected to the outer surface of the fixing rod 1 in a sliding mode, a second sliding block 71 is fixedly connected to one side of the C-shaped connecting piece 7, a second positioning ring 72 is arranged on the second sliding block 71, and a locking screw 73 is arranged on the C-shaped connecting piece 7.

The telescopic rod 4 can be freely adjusted in the telescopic groove 11 in a telescopic mode, and when the telescopic rod 4 is completely retracted into the telescopic groove 11, the fixed rod 1 is flush with the outer surface of the telescopic rod 4 which is exposed;

the adjusting disc 3 is positioned inside the adjusting groove 13, the adjusting disc 3 can drive the linkage shaft 31 to synchronously rotate when rotating, the linkage shaft 31 synchronously drives the linkage disc 32 to rotate when rotating, the linkage disc 32 synchronously drives the two groups of first magnets 321 on the linkage disc to rotate when rotating, and the two groups of first magnets 321 correspond to the two groups of limiting magnetic plates 41 and are mutually adsorbed when in an initial state, so that the telescopic rod 4 in a retracted state can be conveniently adsorbed, and the stability of the telescopic rod 4 after retraction is kept;

when the telescopic rod 4 is needed, only the adjusting disc 3 needs to be rotated, the adjusting disc 3 drives the linkage disc 32 to rotate through the linkage shaft 31, the linkage disc 32 drives the two groups of first magnets 321 to synchronously rotate when rotating, the two groups of first magnets 321 stop when rotating for 90 degrees, so that the first magnet 321 and the limiting magnetic plate 41 are distributed in a staggered manner, and at this time, the magnetic attraction between the first magnet 321 and the limiting magnetic plate 41 is lost, the telescopic rod 4 can be stably extended and adjusted in the telescopic slot 11, and when the telescopic rod 4 is pulled out to a completely unfolded state, the telescopic rod 4 drives the two groups of limiting magnetic plates 41 on the telescopic rod to be adsorbed with the two groups of second magnets 42, therefore, the stability of the telescopic rod 4 after being completely unfolded is guaranteed, the instability of measured data caused by looseness or shrinkage in the measuring process is avoided, the use is convenient and fast, and the movable telescopic rod 4 does not need to be manually controlled;

because vertical distribution and each other do not influence between second sliding hole 43 and the first sliding hole 14 for the inside second sliding block 71 of first sliding hole 14 and the inside first sliding block 6 of second sliding hole 43 do not influence each other, even if telescopic link 4 is located the inside of dead lever 1, the regulation that carries out the position that first sliding block 6 on the second sliding hole 43 still can be free, in order to ensure the activity regulation of first sliding block 6, thereby conveniently fix a position the centre of a circle position of first sliding block 6, reach and carry out quick affirmation to the distance between the first sliding block 6 and the second sliding block 71 centre of a circle.

The two limiting sliding grooves 12 are symmetrically distributed on two sides of the telescopic groove 11, and the interiors of the two limiting sliding grooves 12 are communicated with the interior of the telescopic groove 11.

The limiting sliding groove 12 limits the telescopic rod 4 to slide through the limiting magnetic plate 41, so that the telescopic adjustment stability of the telescopic rod 4 is guaranteed.

The inside of the first sliding hole 14 is communicated with the inside of the telescopic groove 11, and the first sliding hole 14 is of a structure which is through up and down.

The first sliding hole 14 facilitates sliding adjustment of the outer C-shaped link 7 and the second sliding block 71.

One end of the linkage shaft 31 penetrates through the fixed rod 1 and extends into the telescopic groove 11, and the surface of the linkage shaft 31 is rotatably connected with the inner surface of the fixed rod 1.

The two first magnets 321 are symmetrically distributed on the surface of the linkage disk 32, and both the two first magnets 321 are located at the non-center of the linkage disk 32.

First magnet 321 conveniently adsorbs and fixes telescopic link 4 after packing up, and the stability after the telescopic link 4 packs up is ensured, when telescopic link 4 takes in the inside of shrink groove 11 completely, with first magnet 321's position control to with spacing magnetic sheet 41 on the relative position can.

An indicator 33 is fixedly connected to one end of the adjusting disc 3, and the position of the indicator 33 is matched with the position of the first magnet 321.

The indicator 33 facilitates the user to identify the orientation of the first magnet 321 on the linkage disk 32, thereby facilitating identification and confirmation of the position of the first magnet 321.

The surfaces of the two limiting magnetic plates 41 are respectively connected with the inner surfaces of the two limiting sliding grooves 12 in a sliding manner, the surfaces of the two limiting magnetic plates 41 are matched with the surfaces of the two first magnets 321, and the surfaces of the two second magnets 42 are matched with the surfaces of the two limiting magnetic plates 41.

When the telescopic link 4 is expanding the use, adsorb between second magnet 42 and the spacing magnetic sheet 41 and carry on spacingly to telescopic link 4, stability after the expansion of guarantee telescopic link 4, when needs are packed up telescopic link 4 after expanding, only need press telescopic link 4 to the inside in flexible groove 11, make between second magnet 42 and the spacing magnetic sheet 41 under the effect of thrust separate can, telescopic link 4 can be to the inside shrink regulation in flexible groove 11, high durability and convenient use, and the operation is simple.

The size of the second sliding hole 43 is matched with the size of the first sliding hole 14, and the second sliding hole 43 is on the same vertical plane with the first sliding hole 14.

The scale on the surface of the extension ruler 5 is matched with the scale on the surface of the measuring scale 2, and the measuring surface of the extension ruler 5 and the measuring surface of the measuring scale 2 are on the same vertical plane.

The first positioning ring 61 is provided with a triangular positioning indication groove, the indication direction of the triangular positioning indication groove faces the direction of the scale of the extension ruler 5, the cross section of the first sliding block 6 is in an I-shaped structure, the bottom of the second sliding block 71 extends to the inside of the first sliding hole 14, the size of the second positioning ring 72 is the same as that of the first positioning ring 61, and the outer surface of the second positioning ring 72 is in sliding connection with the inner surface of the first sliding hole 14.

The first positioning ring 61 and the second positioning ring 72 facilitate the confirmation and positioning of the circle center positions of two circles at different positions, thereby facilitating the rapid positioning and measurement of the circle center distance of the two circles.

A use method of a portable telescopic positioning rod for measurement comprises the following steps:

s1, when the measurement length of the fixed rod 1 needs to be adjusted, the adjusting disc 3 is preferentially rotated, the adjusting disc 3 drives the linkage disc 32 to rotate through the linkage shaft 31, the linkage disc 32 drives the two groups of first magnets 321 on the linkage disc to rotate, so that the two groups of first magnets 321 and the two groups of limiting magnetic plates 41 are staggered and separated, the telescopic rod 4 can be freely stretched and pulled out in the telescopic groove 11 at the moment, and after the telescopic rod 4 is completely pulled out, magnetic adsorption is carried out between the two groups of limiting magnetic plates 41 on the telescopic rod 4 and the two groups of corresponding second magnets 42, so that the stability of the telescopic rod 4 after being unfolded is guaranteed;

s2, after the telescopic rod 4 is completely extended, the measurement starting point of the extension ruler 5 on the telescopic rod 4 corresponds to the measurement terminal point of the measurement ruler 2, so that the continuity of measurement data is guaranteed, and the reading after measurement is convenient to carry out;

s3, when the distance between two circle centers needs to be drawn, the second positioning ring 72 is preferably fixed at the zero scale on the fixing rod 1, the center of the second positioning ring 72 is aligned with the center of the first circle, the distance between the first positioning ring 61 and the second positioning ring 72 is adjusted according to the use requirement, and the distance between the center of the first positioning ring 61 and the center of the second positioning ring 72 is the distance indicated by the first positioning ring 61, so as to quickly and conveniently find the center position of the required distance.

The working principle of the portable telescopic positioning rod for measurement provided by the invention is as follows:

when the measurement length of the fixed rod 1 needs to be adjusted, the adjusting disc 3 is preferentially rotated, the adjusting disc 3 drives the linkage disc 32 to rotate through the linkage shaft 31, the linkage disc 32 drives the two groups of first magnets 321 on the linkage disc to rotate, so that the two groups of first magnets 321 and the two groups of limiting magnetic plates 41 are staggered and separated, the telescopic rod 4 can be freely extended and pulled out in the telescopic groove 11 at the moment, and after the telescopic rod 4 is completely pulled out, magnetic adsorption is performed between the two groups of limiting magnetic plates 41 on the telescopic rod 4 and the two groups of corresponding second magnets 42, so that the stability of the telescopic rod 4 after being unfolded is guaranteed;

after the telescopic rod 4 is completely extended, the measurement starting point of the extension ruler 5 on the telescopic rod 4 corresponds to the measurement end point of the measurement ruler 2, so that the continuity of measurement data is guaranteed, and the reading after measurement is convenient to perform;

when the distance between two circle centers needs to be drawn, the second positioning ring 72 is preferentially fixed at the zero scale position on the fixing rod 1, the circle center of the second positioning ring 72 is aligned to the circle center of the first circle, the distance between the first positioning ring 61 and the second positioning ring 72 is adjusted according to the use requirement, and the distance between the circle center of the first positioning ring 61 and the circle center of the second positioning ring 72 is the distance indicated by the first positioning ring 61, so that the circle center position of the required distance can be conveniently and rapidly found.

Compared with the related art, the portable telescopic positioning rod for measurement provided by the invention has the following beneficial effects:

corresponding and mutual absorption with two sets of spacing magnetic sheet 41 during two sets of first magnet 321 initial conditions, thereby the convenience adsorbs telescopic link 4 to packing up the state, stability after 4 packs up with keeping telescopic link, adsorb between spacing magnetic sheet 41 and two sets of second magnet 42, thereby guarantee the stability after 4 expandes completely of telescopic link, avoid measuring in-process to take place not hard up or shrink and cause measured data unstable, high durability and convenient use, do not need manually to control movable telescopic link 4, first position circle 61 and second position circle 72 conveniently confirm and fix a position the centre of a circle position of two different position circles, thereby conveniently carry out quick location and measurement to the centre of a circle distance of two circles.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. The utility model provides a measure with portable flexible locating lever which characterized in that includes:

the fixing rod is provided with a telescopic groove at one end, two limiting sliding grooves are formed in the fixing rod, an adjusting groove is formed at the other end of the fixing rod, and a first sliding hole is formed in the fixing rod;

the bottom of the measuring scale is fixed on the upper surface of the fixing rod;

the adjusting disc is arranged inside the adjusting groove, a linkage shaft is fixedly connected to the axis of the adjusting disc, a linkage disc is fixedly connected to one end of the linkage shaft, and two first magnets are arranged on the surface of the linkage disc;

the surface of the telescopic rod is connected to the inner surface of the telescopic groove in a sliding mode, the two sides of the surface of the telescopic rod are fixedly connected with limiting magnetic plates, one side of the inner wall of each of the two limiting sliding grooves is fixedly connected with a second magnet, and a second sliding hole is formed in the telescopic rod;

the bottom of the extension ruler is fixed on the surface of the telescopic rod;

the surface of the first sliding block is connected to the inner surface of the second sliding hole in a sliding mode, and a first positioning ring is arranged on the first sliding block;

the inner surface of the C-shaped connecting piece is connected with the outer surface of the fixing rod in a sliding mode, a second sliding block is fixedly connected to one side of the C-shaped connecting piece, a second positioning ring is arranged on the second sliding block, and a locking screw is arranged on the C-shaped connecting piece.

2. The portable telescopic positioning rod for measurement according to claim 1, wherein the two limiting sliding grooves are symmetrically distributed on both sides of the telescopic groove, and the insides of the two limiting sliding grooves are communicated with the inside of the telescopic groove.

3. The portable telescopic positioning rod for measurement according to claim 1, wherein an inside of the first sliding hole and an inside of the telescopic groove communicate with each other, and the first sliding hole has a vertically through structure.

4. The portable telescopic locating rod for measurement as claimed in claim 1, wherein one end of the linkage shaft penetrates through the fixing rod and extends to the inside of the telescopic groove, and the surface of the linkage shaft is rotatably connected with the inner surface of the fixing rod.

5. The portable telescopic positioning rod for measurement according to claim 1, wherein the two first magnets are symmetrically distributed on the surface of the linkage disk, and both the two first magnets are located at a non-center of the linkage disk.

6. The portable telescopic positioning rod for measurement as claimed in claim 1, wherein an indicator is fixedly connected to one end of the adjusting plate, and the position of the indicator is matched with the position of the first magnet.

7. The portable telescopic positioning rod for measurement according to claim 1, wherein the surfaces of the two limiting magnetic plates are respectively connected with the inner surfaces of the two limiting sliding grooves in a sliding manner, the surfaces of the two limiting magnetic plates are matched with the surfaces of the two first magnets, and the surfaces of the two second magnets are matched with the surfaces of the two limiting magnetic plates.

8. The portable telescopic positioning rod for measurement as claimed in claim 1, wherein the second sliding hole is adapted to the first sliding hole in size, and the second sliding hole is in the same vertical plane as the first sliding hole, and the scale on the surface of the extension scale is adapted to the scale on the surface of the measurement scale, and the measurement surface of the extension scale is in the same vertical plane as the measurement surface of the measurement scale.

9. The portable telescopic positioning rod for measurement as claimed in claim 1, wherein the first positioning ring is provided with a triangular positioning indication groove, the indication direction of the triangular positioning indication groove faces the direction of the scale of the extension ruler, the cross section of the first sliding block is in an I-shaped structure, the bottom of the second sliding block extends into the first sliding hole, the size of the second positioning ring is the same as that of the first positioning ring, and the outer surface of the second positioning ring is in sliding connection with the inner surface of the first sliding hole.

10. A use method of a portable telescopic positioning rod for measurement is characterized by comprising the following steps:

s1, when the measured length of the fixed rod needs to be adjusted, the adjusting disc is preferentially rotated, the adjusting disc drives the linkage disc to rotate through the linkage shaft, the linkage disc drives the two groups of first magnets on the linkage disc to rotate, so that the two groups of first magnets and the two groups of limiting magnetic plates are staggered and separated, the telescopic rod can be freely stretched and pulled out in the telescopic groove at the moment, after the telescopic rod is completely pulled out, magnetic adsorption is carried out between the two groups of limiting magnetic plates on the telescopic rod and the two groups of corresponding second magnets, and therefore the stability of the telescopic rod after being unfolded is guaranteed;

s2, after the telescopic rod is fully extended, the measurement starting point of the extension ruler on the telescopic rod corresponds to the measurement terminal point of the measurement ruler, so that the continuity of measurement data is guaranteed, and the measured reading is convenient to carry out;

s3, when the distance between two circle centers needs to be drawn, the second positioning ring is preferentially fixed at the zero scale position on the fixed rod, the circle center of the second positioning ring is aligned to the circle center of the first circle, the distance between the first positioning ring and the second positioning ring is movably adjusted according to the use requirement, and the distance between the circle center of the first positioning ring and the circle center of the second positioning ring is the distance indicated by the first positioning ring, so that the circle center position of the required distance can be conveniently and quickly found.

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