CN210154528U - Measuring device - Google Patents

Abstract

The embodiment of the utility model provides a measuring device, which comprises a base, a photoelectric counter and a rotating part, wherein the rotating part is used for winding the measuring part, the rotating part is rotatably connected with the base, and the measuring part is used for driving the rotating part to rotate relative to the base; the photoelectric counter is connected with the base, the rotating part is provided with a shading part used for shading light rays emitted by the photoelectric counter, and the photoelectric counter is used for recording the times of shading the light rays in the rotating process of the rotating part relative to the base. The measuring result has small error and high accuracy.

Description

Measuring device

Technical Field

The utility model relates to a measure technical field, particularly, relate to a measuring device.

Background

Currently, there are various apparatuses for measuring the size of an article, and the length or the circumference of the article, etc. may be measured. For example, a measuring device measures the head circumference and waist circumference of a human body by using a tape, and when the measuring device is used, the tape is wound at a proper position of the head or waist, and the reading can be directly read or displayed by using an electronic device.

The research shows that the prior measuring device has the following disadvantages:

the measurement result has large error and is inaccurate.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a measuring device, its measuring result error is little, and the accuracy is high, for example.

The embodiment of the utility model discloses a can realize like this:

an embodiment of the utility model provides a measuring device, measuring device includes:

the photoelectric counter comprises a base, a rotating piece, a photoelectric counter and a rotating piece, wherein the rotating piece is used for winding a measuring piece; the photoelectric counter is connected with the base, the rotating part is provided with a shading part used for shading light rays emitted by the photoelectric counter, and the photoelectric counter is used for recording the times of shading the light rays in the rotating process of the rotating part relative to the base.

In an alternative embodiment, the number of the light shielding portions is plural, and the plural light shielding portions are arranged at regular intervals in the circumferential direction of the rotary member.

In an alternative embodiment, the rotating member comprises a connecting disc and a grating disc, the connecting disc is rotatably connected with the base, and the grating disc is connected with the connecting disc; the measuring part is used for being connected with the connecting disc and can be wound outside the connecting disc, and the shading part is arranged on the grating disc.

In an alternative embodiment, the grating disk is provided with a plurality of light-transmitting portions, the light-transmitting portions are uniformly arranged at intervals along the circumferential direction of the grating disk, and a light-shielding portion is formed between adjacent light-transmitting portions.

In an alternative embodiment, the measuring device further comprises a first resetting member, the first resetting member is disposed on the base, and the first resetting member is used for enabling the rotating member to have a tendency to rotate in a second direction opposite to the first direction after rotating in the first direction relative to the base under the action of an external force.

In an alternative embodiment, the measuring device further comprises an anti-reverse structure, which is arranged on the base and is used for enabling the rotating member to rotate relative to the base in a first direction under the action of external force and limiting the rotating member to rotate relative to the base in a second direction opposite to the first direction.

In an alternative embodiment, the anti-reverse structure includes a ratchet wheel connected to the rotary member and a pawl connected to the base, the pawl being releasably engageable with a catch on the ratchet wheel.

In an optional embodiment, the anti-reverse structure further comprises an unlocking piece and a second reset piece, the pawl is connected with the unlocking piece, the unlocking piece is movably connected with the base, and the second reset piece is arranged on the base and used for enabling the pawl to have a tendency of rotating relative to the base so that the pawl is clamped with the clamping groove.

In an optional embodiment, the measuring piece comprises a measuring tape and a clamping column, one end of the measuring tape is connected with the rotating piece, and the other end of the measuring tape is connected with the clamping column; be provided with the joint groove on the base, joint post and joint groove sliding fit, and the joint post can the joint in the joint inslot.

In an alternative embodiment, the outer side of the base is provided with an arcuate surface that engages the head or waist.

The utility model discloses beneficial effect includes, for example:

in summary, the measuring device provided in this embodiment applies an external force to the measuring element during measurement, so that the measuring element is detached from the rotating element, and the rotating element is driven to rotate relative to the base, and during the rotation of the rotating element, the light shielding portion can rotate to the position of the photoelectric counter and block the light emitted by the photoelectric counter. The pulling distance of the measuring piece corresponds to the starting end and the terminal end of the measured object, the stretching length of the measuring piece corresponds to the rotating distance of the rotating piece, the rotating distance of the rotating piece is recorded by the photoelectric counter and the result is calculated, namely the rotating distance of the rotating piece is calculated according to the number of times that the light of the photoelectric counter is shielded. The measuring piece is directly wound outside the rotating piece, so that the measuring piece cannot slip with the rotating piece in the pulling process, the rotating path of the rotating piece is the length of the measuring piece unwound from the rotating piece, namely the relevant size of a measured object, the rotating path of the rotating piece is recorded and calculated by the photoelectric counter, and the result is accurate and reliable.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a measurement apparatus provided in this embodiment;

fig. 2 is a schematic structural diagram of the measuring member provided in this embodiment;

fig. 3 is a schematic structural diagram of the base provided in this embodiment;

fig. 4 is a schematic structural diagram of a first viewing angle of the measuring apparatus provided in this embodiment (the upper housing is not shown);

fig. 5 is a schematic structural diagram of a second viewing angle of the measuring apparatus provided in this embodiment (the lower housing is not shown);

fig. 6 is a schematic structural diagram of a rotating member, a measuring member and a second resetting member provided in this embodiment;

FIG. 7 is a schematic structural diagram of a rotating member, a measuring member, a photoelectric counter and an anti-reverse structure provided in this embodiment;

fig. 8 is a schematic structural diagram of the rotating member provided in this embodiment.

Icon: 001-a measuring device; 100-a base; 110-an upper housing; 111-a first arc face; 112-a first snap groove; 113-a first bayonet; 120-a lower shell; 121-a second arc-shaped face; 122-a second snap groove; 123-a second bayonet; 124-a guide wheel; 125-rotating shaft; 200-a photoelectric counter; 210-a light source; 220-a photosensitive tube; 300-a rotating member; 310-a central body; 311-mounting grooves; 320-a first limiting disc; 330-a second limiting disc; 340-a grating disk; 341-a light-shielding portion; 342-a light-transmitting portion; 350-annular groove; 400-a measuring member; 410-tape measure; 420-a clamping column; 500-a first reset piece; 600-anti-reverse structure; 610-a ratchet wheel; 611-card slot; 620-pawl; 630-a second reset piece; 640-unlocking the piece; 700-a power supply; 800-display.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience of description and simplification, but the indication or suggestion that the indicated device or element must have a specific position, be constructed and operated in a specific orientation, and thus, should not be interpreted as a limitation of the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

Referring to fig. 1, the present embodiment provides a measuring device 001, which is suitable for measuring the length or the circumference of an object, where the object to be measured may be regular or irregular. For example, the measuring device can be used for measuring the head and waist of a human body, and correspondingly measuring the head circumference and waist circumference of the human body. The measuring device 001 has high accuracy of the measured result.

Referring to fig. 1, 4 and 5, the measuring device 001 of the present embodiment includes a base 100, a photoelectric counter 200, and a rotating member 300 for winding a measuring member 400, wherein the rotating member 300 is rotatably connected to the base 100, and the measuring member 400 is used for driving the rotating member 300 to rotate relative to the base 100; the photoelectric counter 200 is connected to the base 100, the rotary member 300 has a light shielding portion 341 for shielding light emitted from the photoelectric counter 200, and the photoelectric counter 200 is used for recording the number of times the rotary member 300 is rotated relative to the base 100 to shield light.

During measurement, in an initial state, the measuring part 400 is arranged outside the rotating part 300 in a winding mode, when the size needs to be measured, an external force is applied to the measuring part 400, the measuring part 400 is pulled to enable the measuring part 400 to be unfastened from the rotating part 300, the rotating part 300 is driven to rotate relative to the base 100 along the first direction, in the rotating process of the rotating part 300, the light shielding part 341 on the rotating part 300 can rotate to the position of the photoelectric counter 200 and block light rays emitted by the photoelectric counter 200, after the light shielding part 341 leaves the position for shielding the light rays, the light rays penetrate through the rotating part 300, the photoelectric counter 200 can record the times that the light rays are shielded and penetrate, and then the angular displacement of the rotating part 300, namely the movement distance of the measuring part 400, is obtained through calculation. The pulling distance of the measuring member 400 corresponds to the starting end and the terminal end of the object to be measured, the length of the measuring member 400 is corresponding to the rotating distance of the rotating member 300, the rotating distance of the rotating member 300 (i.e. the angular displacement of the rotating member 300) is recorded by the photoelectric counter 200, and the result is calculated, namely, the rotating distance of the rotating member 300 is calculated according to the number of times that the light of the photoelectric counter 200 is blocked. Because the measuring part 400 is directly wound outside the rotating part 300, the measuring part 400 does not slip with the rotating part 300 in the pulling process, the rotating path of the rotating part 300 is the length of the measuring part 400 untwisted from the rotating part 300, namely the relevant size of the measured object, the rotating path of the rotating part 300 is recorded and calculated by the photoelectric counter 200, and the result is accurate and reliable.

It should be noted that the measuring device 001 may comprise the measuring member 400, i.e. the measuring device 001 may be a stand-alone product. In other embodiments, the measuring device 001 and the measuring member 400 are separate parts, and when it is necessary to use, the measuring member 400 is connected to the rotating member 300. In other words, the measuring member 400 may be detachably coupled to the rotating member 300, so that the measuring member 400 can be detached and used alone, and the measuring member 400 can be replaced.

Referring to fig. 2, in the present embodiment, the measuring member 400 includes a measuring tape 410, and the measuring tape 410 is made of a flexible material and can be freely bent so as to be wound around the rotating member 300. Alternatively, the measuring member 400 has a rectangular bar shape.

In other embodiments, the measuring member 400 further includes a locking column 420, the locking column 420 may be a cylinder, the locking column 420 is connected to an end of the tape 410 away from the rotating member 300, the locking column 420 may be releasably locked to the base 100, and when the locking column 420 is separated from the base 100, the tape 410 may be used to measure the length of an object; when the snap post 420 is snapped with the base 100, the tape 410 facilitates measuring the circumference of an object, such as measuring the head circumference or waist circumference of a user.

Referring to fig. 3, in the present embodiment, the base 100 is a housing structure, the base 100 includes an upper housing 110 and a lower housing 120 that are fastened together, and the upper housing 110 and the lower housing 120 form a cavity together, which can accommodate the rotating member 300 and the photoelectric counter 200. The upper housing 110 and the lower housing 120 may be connected by a snap structure, and may also be screwed by a screw, which is not limited in this embodiment.

Optionally, the outer side of the upper housing 110 has a first arc-shaped surface 111, and the first arc-shaped surface 111 is provided with a first clamping groove 112 and a first clamping opening 113. The cross section outline of the first clamping groove 112 comprises a first arc section and two first straight line sections connected with two ends of the first arc section respectively, the two first straight line sections are arranged in parallel, and the distance between the two first straight line sections is smaller than the diameter of the first arc section.

Optionally, the outer side of the lower shell 120 has a second arc-shaped surface 121, and the second arc-shaped surface 121 is provided with a second clamping groove 122 and a second clamping opening 123. The cross section profile of the second clamping groove 122 comprises a second circular arc section and two second straight sections respectively connected with two ends of the second circular arc section, the two second straight sections are arranged in parallel, and the distance between the two second straight sections is smaller than the diameter of the second circular arc section. After the upper housing 110 and the lower housing 120 are fastened, the first fastening groove 112 communicates with the second fastening groove 122, and the first fastening opening 113 communicates with the second fastening opening 123. The first arc-shaped face 111 and the second arc-shaped face 121 constitute arc-shaped faces that cooperate with the head or waist for use.

Referring to fig. 3 and 4, further, two guide wheels 124 are disposed on the inner side of the lower housing 120 close to the second bayonet 123, the two guide wheels 124 are disposed at intervals, a gap for the measuring part 400 to pass through is formed between the two guide wheels 124, the measuring part 400 can pass through the gap and be positioned through the gap, the measuring part 400 is in contact with the wheel surfaces of the two guide wheels 124, the friction force is small, the measuring part 400 is convenient to pull, and the wear of the measuring part 400 is also reduced.

Further, a rotating shaft 125 is disposed on the inner bottom wall of the lower housing 120, the axis of the rotating shaft 125 is parallel to the axis of the guide wheel 124, and the rotating shaft 125 is used for mounting the rotating member 300. The rotation shaft 125 is provided with a drop-off prevention structure at an end thereof distant from the bottom wall of the lower case 120, which can prevent the rotary 300 mounted on the rotation shaft 125 from dropping off from the end of the rotation shaft 125 distant from the bottom wall of the lower case 120.

Referring to fig. 6 and 8, in the present embodiment, the rotating element 300 includes a central body 310, a first limiting plate 320, a second limiting plate 330 and a grating plate 340, wherein the central body 310 is a cylinder and has a rotation hole, and an axis of the rotation hole coincides with an axis of the central body 310. The first limiting plate 320 may be a circular plate, and the first limiting plate 320 is connected to one side of the central body 310 in the axial direction. The second limiting plate 330 may be a circular plate, the second limiting plate 330 is connected to the other side of the central body 310 in the axial direction, the first limiting plate 320, the central body 310 and the second limiting plate 330 are coaxial, and the first limiting plate 320, the second limiting plate 330 and the central body 310 jointly define an annular groove 350 for accommodating the measuring part 400. The first stopping disk 320 has a through hole communicating with the rotation hole of the central body 310, and the second stopping disk 330 has a through hole communicating with the rotation hole of the central body 310. It should be noted that the central body 310, the first retainer disk 320 and the second retainer disk 330 may be integrally formed. The grating disk 340 is a circular disk, and the grating disk 340 is connected with the second limiting disk 330 and coaxially arranged with the second limiting disk. The grating disk 340 is provided with a light-transmitting portion 342, and the light-transmitting portion 342 may be a light-transmitting hole penetrating through the grating disk 340, or the light-transmitting portion 342 is made of a light-transmitting material. The number of the light-transmitting portions 342 is plural, the plural light-transmitting portions 342 are uniformly arranged at intervals along the circumferential direction of the grating disk 340, and one light-shielding portion 341 is provided between adjacent light-transmitting portions 342. When the measuring member 400 pulls the rotating member 300 to rotate, the light shielding portion 341 and the light transmitting portion 342 on the grating disk 340 alternately pass through the light emitted from the light source 210, so that the light is blocked by the light shielding portion 341, or the light passes through the light transmitting portion 342 and irradiates the photosensitive tube 220.

Further, a mounting groove 311 is disposed on a side of the central body 310 close to the second limiting plate 330, one end of the rotation hole is located at a bottom of the mounting groove 311, the mounting groove 311 may be a cylindrical groove, and the rotation hole is coaxial with the mounting groove 311.

When installed, the rotary member 300 is sleeved outside the rotary shaft 125 of the lower housing 120 through the rotary hole, and the rotary member and the rotary shaft are rotatably engaged.

Referring to fig. 7, in the present embodiment, the photoelectric counter 200 includes a light source 210 and a photodiode 220, the photodiode 220 is electrically connected to a controller of the measuring device 001, the light source 210 and the photodiode 220 are respectively located at two sides of the rotating member 300, the light source 210 can emit light toward the photodiode 220, the rotating member 300 can transmit light to irradiate the photodiode 220 with light during rotation, and can also block light, the photoelectric sensor can sense the on/off of light and transmit a signal to the controller of the measuring device 001, and the controller calculates the angular displacement of the rotating member 300 to obtain a measurement result of the measuring device 400.

In this embodiment, optionally, the measuring device 001 further includes a first resetting member 500, and the first resetting member 500 is a coil spring, that is, a clockwork spring. The coil spring is positioned in the mounting groove 311, one end of the coil spring is abutted by the rotary member 300, the other end of the coil spring is abutted by the base 100, and the reset member is used for enabling the rotary member 300 to have a tendency of rotating in a second direction opposite to the first direction. In other words, in use, pulling the measuring member 400 disengages the measuring member 400 from the rotary member 300, and the rotary member 300 rotates in a first direction. After the use, the external force applied to the measuring member 400 disappears, and under the action of the first reset member 500, the rotating member 300 can be reversed along the second direction, so that the measuring member 400 is wound outside the rotating member 300, and the next use is facilitated.

Referring to fig. 7, in the present embodiment, optionally, the measuring device 001 further includes an anti-reverse structure 600, where the anti-reverse structure 600 is disposed on the base 100, and is used for enabling the rotating member 300 to rotate relative to the base 100 in a first direction under the action of an external force, and limiting the rotating member 300 from rotating relative to the base 100 in a second direction opposite to the first direction. In other words, the anti-reverse structure 600 is used to prevent the rotation member 300 from rotating in the second direction, and can allow the rotation member 300 to rotate in the first direction, that is, at the time of measurement, by pulling the measuring member 400 to rotate the rotation member 300 in the first direction to unlock the measuring member 400 from the rotation member 300, the measurement operation is performed. In the measuring process, after the measuring part 400 is loosened, the rotating part 300 cannot automatically rotate along the second direction under the action of the first resetting part 500, the measuring part 400 is clamped at the pulled-out position, the situation that measuring data are lost after the measuring part 400 is loosened is not prone to occurring, and counting is facilitated.

Optionally, the anti-reverse structure 600 includes a ratchet 610 and a pawl 620, the ratchet 610 is connected to the rotating member 300, or in other embodiments, the ratchet 610 is integrally formed with the first limiting disc 320 of the rotating member 300, that is, the ratchet teeth uniformly arranged may be directly machined on the outer circumferential surface of the first limiting disc 320, a clamping groove 611 is defined between adjacent ratchet teeth, and the first limiting disc 320 is the ratchet 610. It should be noted that the number of ratchet teeth on the ratchet 610 is set as required, and is not particularly limited herein. The pawl 620 is rotatably coupled to the base 100 such that the pawl 620 releasably engages the slot 611 in the ratchet 610. In other words, the pawl 620 is always kept in a state of abutting against the slot 611, when the rotating member 300 rotates along the first direction, the ratchet 610 can pull the pawl 620 open, the rotating member rotates normally, when the pulling force applied to the measuring member 400 is removed, the rotating member 300 has a tendency of rotating along the second direction under the action of the first resetting member 500, and at this time, the pawl 620 abuts against the slot 611, so that the rotating member 300 is prevented from rotating reversely, and at this time, data recording is facilitated.

Further, the anti-reverse structure 600 further includes an unlocking piece 640 and a second reset piece 630, the pawl 620 is connected with the unlocking piece 640, the unlocking piece 640 is movably connected with the base 100, the unlocking piece 640 extends out of the base 100, and the pawl 620 can be driven to rotate relative to the base 100 by pressing the unlocking piece 640. The second reset piece 630 is disposed on the base 100 and is used for enabling the pawl 620 to have a tendency to rotate relative to the base 100 so that the pawl 620 can be engaged with the slot 611. Under normal conditions, the effort of the second piece 630 that resets makes pawl 620 remain the locking state of joint in draw-in groove 611 all the time, when needs unblock, presses unblock piece 640, and unblock piece 640 drives pawl 620 and rotates, makes pawl 620 break away from draw-in groove 611, and at this moment, when being greater than the pulling force of applying on measuring part 400 under the effort of first piece 500 that resets, first piece 500 that resets can drive rotating part 300 along the reversal of second direction, makes measuring part 400 around establishing outside rotating part 300.

Alternatively, the second restoring member 630 may be a torsion spring.

In this embodiment, optionally, the measuring device 001 further includes a power supply 700, the power supply 700 includes a battery, and the battery supplies power to the measuring device 001, for example, the battery is electrically connected to the photoelectric counter 200. The battery may be a rechargeable battery.

In this embodiment, optionally, the measuring device 001 further includes a display 800, and the display 800 is electrically connected to the photoelectric counter 200 and is configured to display the angular displacement of the rotating member 300 calculated by the photoelectric counter 200, so as to facilitate direct reading and obtaining a result.

In the initial state of the measuring device 001 provided in this embodiment, the tape 410 is wound around the central body 310, the locking column 420 is located outside the base 100, and the locking column 420 is simultaneously locked in the first locking opening 113 and the second locking opening 123. In the embodiment, taking the measurement of the head of the user as an example, the tape measure 410 is unfastened from the central body 310 by pulling the clip column 420, and the clip column 420 is inserted into the first clip groove 112 and the second clip groove 122, so that the clip column 420 does not fall off from the notches of the first clip groove 112 and the second clip groove 122. Then, the tape 410 is pulled to enlarge the area enclosed by the tape 410 and the base 100, the first arc-shaped surface 111 and the second arc-shaped surface 121 on the base 100 are aligned with and attached to the head of the user, the tape 410 is released, the unlocking piece 640 is pressed, the tape 410 automatically retracts under the action of the first resetting piece 500, and the tape 410 is tightly attached to the head of the user. The photoelectric counter 200 can calculate the angular displacement of the rotating member 300 in forward or reverse rotation during the process of pulling out or retracting the tape 410, and obtain the final measurement size. After the measurement is completed, the unlocking piece 640 can be firstly released, the tape 410 cannot automatically retract, and the measuring device 001 is taken down from the head of the user, so that the reading is convenient. After the use, the clamping column 420 is pulled out from the first clamping groove 112 and the second clamping groove 122, the unlocking piece 640 is pressed, and the tape 410 is reset, so that the tape can be used next time. It should be noted that, when measuring the length of the article, the clamping column 420 does not need to be inserted into the first clamping groove 112 and the second clamping groove 122, and the operation is flexible and convenient.

The measuring device 001 provided by the embodiment has accurate measuring result and high reliability.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A measuring device, characterized in that the measuring device comprises:

the photoelectric counter comprises a base, a photoelectric counter and a rotating piece, wherein the rotating piece is used for winding a measuring piece, the rotating piece is rotatably connected with the base, and the measuring piece is used for driving the rotating piece to rotate relative to the base; the photoelectric counter is connected with the base, the rotating part is provided with a shading part used for shading light rays emitted by the photoelectric counter, and the photoelectric counter is used for recording the times of shading the light rays in the rotating process of the rotating part relative to the base.

2. The measurement device of claim 1, wherein:

the number of the light shielding parts is multiple, and the light shielding parts are uniformly arranged at intervals along the circumferential direction of the rotating member.

3. The measurement device according to claim 1 or 2, characterized in that:

the rotating piece comprises a connecting disc and a grating disc, the connecting disc is rotatably connected with the base, and the grating disc is connected with the connecting disc; the measuring part is used for being connected with the connecting disc and can be wound outside the connecting disc, and the shading part is arranged on the grating disc.

4. A measuring device according to claim 3, characterized in that:

the grating disc is provided with a plurality of light transmission parts which are uniformly arranged at intervals along the circumferential direction of the grating disc, and one light shielding part is formed between every two adjacent light transmission parts.

5. The measurement device of claim 1, wherein:

the measuring device further comprises a first resetting piece, the first resetting piece is arranged on the base, the rotating piece can rotate relative to the base in a first direction under the pulling of the measuring piece, and the resetting piece is used for enabling the rotating piece to have a tendency of rotating in a second direction opposite to the first direction.

6. The measurement device of claim 5, wherein:

the measuring device further comprises an anti-reverse structure, wherein the anti-reverse structure is arranged on the base and used for enabling the rotating piece to rotate relative to the base along the first direction under the action of external force and limiting the rotating piece to rotate relative to the base along a second direction opposite to the first direction.

7. The measurement device of claim 6, wherein:

the anti-reverse structure comprises a ratchet wheel and a pawl, the ratchet wheel is connected with the rotating part, the pawl is connected with the base, and the pawl can be releasably clamped with a clamping groove in the ratchet wheel.

8. The measurement device of claim 7, wherein:

prevent reverse structure still includes unlocking piece and second and resets the piece, the pawl with unlocking piece connects, unlocking piece with base swing joint, the second reset the piece set up in the base for the messenger the pawl has for the base rotates so that the pawl with the trend of draw-in groove joint.

9. The measurement device of claim 1, wherein:

the measuring piece comprises a measuring tape and a clamping column, one end of the measuring tape is connected with the rotating piece, and the other end of the measuring tape is connected with the clamping column; the base is provided with a clamping groove, the clamping column is in sliding fit with the clamping groove, and the clamping column can be clamped in the clamping groove.

10. The measurement device of claim 9, wherein:

the outside of base is provided with the arcwall face with user's head or waist cooperation.

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