阅读说明：本技术 一种能够在狭小空间内测量距离的装置 (Device capable of measuring distance in narrow space ) 是由 蔡水东 于 2021-08-31 设计创作，主要内容包括：本发明公开了一种能够在狭小空间内测量距离的装置,包括气泵、第一开关和第二开关,还包括气动卷尺,所述气动卷尺包括收卷主体、控制主体、锁紧主体、引导主体、束缚主体和预量主体,所述收卷主体穿过引导主体和束缚主体,所述引导主体与束缚主体固定连接在一起,所述预量主体固定连接在束缚主体的内端,所述收卷主体与预量主体滑动接触,所述控制主体的一端与收卷主体固定连接在一起,所述控制主体的另一端滑动支撑在收卷主体的下端,所述气泵的吹气工作电路通过第一开关与外接电源电性串联。本发明涉及空间测量设备技术领域,能够自适应长度,从而方便了使用者在狭小空间测量,更好的满足使用需要。(The invention discloses a device capable of measuring distance in a narrow space, which comprises an air pump, a first switch, a second switch and a pneumatic tape, wherein the pneumatic tape comprises a winding main body, a control main body, a locking main body, a guide main body, a constraint main body and a pre-measuring main body, the winding main body penetrates through the guide main body and the constraint main body, the guide main body and the constraint main body are fixedly connected together, the pre-measuring main body is fixedly connected to the inner end of the constraint main body, the winding main body is in sliding contact with the pre-measuring main body, one end of the control main body is fixedly connected with the winding main body, the other end of the control main body is supported at the lower end of the winding main body in a sliding mode, and an air blowing working circuit of the air pump is electrically connected in series with an external power supply through the first switch. The invention relates to the technical field of space measuring equipment, and the length can be self-adapted, so that a user can conveniently measure in a narrow space, and the use requirement can be better met.)

1. A device capable of measuring a distance in a narrow space, comprising an air pump (11), a first switch (14) and a second switch (15), characterized in that: the pneumatic measuring tape comprises a pneumatic measuring tape (1), wherein the pneumatic measuring tape (1) comprises a winding main body (2), a control main body (3), a locking main body (4), a guiding main body (5), a binding main body (6) and a pre-measuring main body (7), the winding main body (2) penetrates through the guiding main body (5) and the binding main body (6), the guiding main body (5) is fixedly connected with the binding main body (6), the pre-measuring main body (7) is fixedly connected at the inner end of the binding main body (6), the winding main body (2) is in sliding contact with the pre-measuring main body (7), one end of the control main body (3) is fixedly connected with the winding main body (2), the other end of the control main body (3) is slidably supported at the lower end of the winding main body (2), and a blowing working circuit of an air pump (11) is electrically connected in series with an external power supply through a first switch (14), the air pumping working circuit of the air pump (11) is electrically connected in series with an external power supply through a second switch (15), the control body (3) comprises a shell frame (12), the outer end of the air pump (11) is fixedly connected to the side end of the shell frame (12), a first switch (14) and a second switch (15) are fixedly connected to the outer wall of the shell frame (12), the upper end of the air pump (11) is fixedly connected with the winding body (2), and the inner space of the air pump (11) is communicated with the inner space of the winding body (2).

2. The apparatus according to claim 1, wherein the apparatus is capable of measuring a distance in a narrow space, and comprises: the winding main body (2) comprises an elastic ruler strip (9) and a strip-shaped air bag (10), the outer wall of the strip-shaped air bag (10) is fixedly connected to the lower end of the elastic ruler strip (9), the elastic ruler strip (9) and the strip-shaped air bag (10) are inserted into the inner ends of the guide main body (5) and the constraint main body (6), one end of the lower portion of the strip-shaped air bag (10) is fixedly connected with the control main body (3), the outer ends of the elastic ruler strip (9) and the strip-shaped air bag (10) are extruded by the guide main body (5) in a manner that the control main body (3) inflates the strip-shaped air bag (10), so that gas is expanded from one end of the strip-shaped air bag (10) to act on the guide main body (5), the purpose of pushing the guide main body (5) to move is achieved, the elastic ruler strip (9) is conveniently extended by the boundary of the guide main body (5), and the integral expansion of the strip-shaped air bag (10) is avoided, after the control body (3) extracts the gas in the winding body (2), the locking body (4), the guide body (5), the binding body (6) and the pre-measuring body (7) are manually restored to be ready for reuse.

3. The device according to claim 2, wherein the device is capable of measuring distance in a narrow space, and comprises: the rolling main part (2) further comprises a blocking strip (8), and the blocking strip (8) is fixedly connected to the outer ends of the elastic ruler strip (9) and the strip-shaped air bag (10).

4. A device capable of measuring distance in a narrow space according to claim 3, wherein: the control main body (3) further comprises a cushion block (13), the lower end of the cushion block (13) is fixedly connected to the upper end of the shell frame (12), and the upper end of the cushion block (13) is slidably supported at the lower end of the rolling main body (2).

5. The apparatus according to claim 1, wherein the apparatus is capable of measuring a distance in a narrow space, and comprises: the locking main body (4) comprises a connecting rod (16), an iron block (18), an extrusion strip (19), a connecting block (20), an elastic strip (21), a limiting block (22) and a first bearing seat (23), one end of the connecting rod (16) is rotationally connected with the first bearing seat (23), the other end of the connecting rod (16) is fixedly connected with the iron block (18), the upper end of the extrusion strip (19) is fixedly connected with the lower end of the connecting rod (16), the upper end of the connecting block (20) is fixedly connected with the side end of the elastic strip (21), the lower end of the connecting block (20) is fixedly installed at the outer end of the binding main body (6), the upper wall of the elastic strip (21) is extruded at the lower wall of the limiting block (22), the connecting block (20) is fixedly connected with the connecting rod (16) into a whole, and the lower end of the first bearing seat (23) is fixedly connected with the binding main body (6), the extrusion strip (19) is slidably mounted at the inner end of the binding main body (6), and the extrusion strip (19) penetrates through the binding main body (6) and is extruded with the winding main body (2).

6. The device according to claim 5, wherein the device is capable of measuring distance in a narrow space, and comprises: the locking main body (4) further comprises a handle (17), and the lower end of the handle (17) is fixedly connected to the upper end of the iron block (18).

7. The apparatus according to claim 1, wherein the apparatus is capable of measuring a distance in a narrow space, and comprises: the guide main body (5) comprises a rotating rod (24) and a second bearing seat (25), the rotating rod (24) is provided with a pair of rotating seats, the second bearing seat (25) is arranged on the side portion of the rotating rod (24), the second bearing seat (25) is rotatably connected with the rotating rod (24), the second bearing seat (25) is fixedly installed together with the binding main body (6), and the rotating rod (24) extrudes the outer end of the winding main body (2).

8. The apparatus according to claim 1, wherein the apparatus is capable of measuring a distance in a narrow space, and comprises: the utility model discloses a tie main part (6) including spout (26), constraint frame (27), magnet piece (28) and guide slot (29), the upper end at constraint frame (27) is seted up in spout (26) fretwork, magnet piece (28) fixed connection is in the upper end of constraint frame (27), the side at constraint frame (27) is seted up in guide slot (29), the inner space of spout (26) and guide slot (29) link up continuously, rolling main part (2) slide and alternate the inner wall at guide slot (29), magnet piece (28) and locking main part (4) magnetic force attract each other, constraint frame (27) and guide main part (5) fixed connection are in the same place, the side of guide slot (29) and the outer end fixed connection of preliminary volume main part (7) are in the same place.

9. The apparatus according to claim 1, wherein the apparatus is capable of measuring a distance in a narrow space, and comprises: the premeasure main part (7) are including guide block (30) and scale plate (31), guide block (30) symmetry fixed connection is at the side of scale plate (31), the inner wall and rolling main part (2) sliding contact of guide block (30), the outer end fixed connection of scale plate (31) is in the inner of constraint main part (6).

Technical Field

The invention relates to the technical field of space measuring equipment, in particular to a device capable of measuring distance in a narrow space.

Background

When the conventional measurement work is used in a narrow space, the operation is inconvenient after being influenced by the length, and if the body is too short, a long target is difficult to measure, so that a scheme capable of alleviating the problems is urgently needed.

Disclosure of Invention

The present invention is directed to a device capable of measuring a distance in a narrow space, so as to solve the problems of the related art.

In order to achieve the purpose, the invention provides the following technical scheme: a device capable of measuring distance in a narrow space comprises an air pump, a first switch, a second switch and a pneumatic measuring tape, wherein the pneumatic measuring tape comprises a rolling main body, a control main body, a locking main body, a guiding main body, a binding main body and a pre-measuring main body, the rolling main body penetrates through the guiding main body and the binding main body, the guiding main body is fixedly connected with the binding main body, the pre-measuring main body is fixedly connected with the inner end of the binding main body, the rolling main body is in sliding contact with the pre-measuring main body, one end of the control main body is fixedly connected with the rolling main body, the other end of the control main body is slidably supported at the lower end of the rolling main body, an air blowing working circuit of the air pump is electrically connected in series with an external power supply through the first switch, an air pumping working circuit of the air pump is electrically connected in series with the external power supply through the second switch, and the control main body comprises a shell frame, the outer end fixed connection of air pump is in the side of shell frame, first switch and second switch pass through the outer wall fixed connection of shell frame, the upper end and the rolling main part fixed connection of air pump are in the same place, the inner space of air pump link up with the inner space of rolling main part and link up continuously.

Preferably, the rolling main body comprises an elastic ruler strip and a strip-shaped air bag, the outer wall of the strip-shaped air bag is fixedly connected to the lower end of the elastic ruler strip, the elastic ruler strip and the strip-shaped air bag are inserted into the inner ends of the guide main body and the constraint main body, and one end of the lower portion of the strip-shaped air bag is fixedly connected with the control main body. The mode of inflating to the inside of bar gasbag through the control main part, utilize the guide main part extrusion in the outer end of elasticity chi strip and bar gasbag, make gaseous one end inflation by the bar gasbag act on the guide main part, play the purpose that promotes the guide main part and remove, thereby made things convenient for the elasticity chi strip to extend the work by the guide main part demarcation, the whole inflation of bar gasbag has been avoided, after taking the inside gas of rolling main part out through the control main part, manual will lock the main part again, the guide main part, restraint main part and preliminary measurement main part position resume and prepare reuse.

Preferably, the rolling main part still includes the blend stop, blend stop fixed connection is in the outer end of elasticity chi strip and bar gasbag.

Preferably, the control main body further comprises a cushion block, the lower end of the cushion block is fixedly connected to the upper end of the shell frame, and the upper end of the cushion block is slidably supported at the lower end of the rolling main body.

Preferably, the locking main part includes connecting rod, iron plate, extrusion strip, connecting block, bullet strip, stopper and primary shaft bearing, the one end and the primary shaft bearing of connecting rod rotate to link together, the other end and the iron plate fixed connection of connecting rod are in the same place, the upper end of extrusion strip is in the same place with the lower extreme fixed connection of connecting rod, the upper end fixed connection of connecting block is in the side of bullet strip, the lower extreme fixed mounting of connecting block is in the outer end of constraint main part, the upper wall extrusion of bullet strip is at the lower wall of stopper, the connecting block is as an organic whole with connecting rod fixed connection, the lower extreme of primary shaft bearing is in the same place with constraint main part fixed connection, extrusion strip slidable mounting is in the inner of constraint main part, the extrusion strip runs through the constraint main part and is in the same place with the extrusion of rolling main part.

Preferably, the locking main body further comprises a handle, and the lower end of the handle is fixedly connected to the upper end of the iron block.

Preferably, the guide main body comprises a rotating rod and a pair of second bearing seats, the second bearing seats are arranged on the side portions of the rotating rod and are connected with the rotating rod in a rotating mode, the second bearing seats and the binding main body are fixedly installed together, and the rotating rod is extruded at the outer end of the winding main body.

Preferably, the constraint main part includes spout, constraint frame, magnet piece and guide slot, the upper end at the constraint frame is seted up to the spout fretwork, magnet piece fixed connection is in the upper end of constraint frame, the side at the constraint frame is seted up to the guide slot, the inner space of spout and guide slot link up continuously, the inner wall of rolling main part slip alternate in the guide slot, magnet piece and locking main part magnetic force attract each other, the constraint frame is in the same place with guide main part fixed connection, the side of guide slot is in the same place with the outer end fixed connection of preliminary volume main part.

Preferably, the preliminary measurement main part includes guide block and scale plate, guide block symmetry fixed connection is at the side of scale plate, the inner wall and the rolling main part sliding contact of guide block, the outer end fixed connection of scale plate is in the inner of constraint main part.

Compared with the prior art, the invention has the following beneficial effects:

1. utilize the control main part to aerify to the inside of rolling main part, through gas expansion rolling main part, make rolling main part inflation guide main part, make the guide main part form to opposite side skew effort, thereby make the guide main part slide outside along the rolling main part, utilize gas to make rolling main part expansion extension drive guide main part, constraint main part and preliminary measurement main part outwards remove the extension, and then reach the purpose of self-adaptation measurement, made things convenient for the user to measure in narrow space.

2. Triggering the air pump to blow air by manually pressing the first switch, and blowing air into the strip-shaped air bag by using the air pump; the first switch is loosened and the second switch is pressed, so that the gas in the strip-shaped air bag is extracted through the second switch, the aim of recovering the strip-shaped air bag is achieved, and the handheld operation of a user is facilitated. The elastic ruler strip is extended from the boundary of the guide main body by controlling the main body to extract the gas in the rolling main body, and then the locking main body, the guide main body, the binding main body and the pre-measuring main body are manually restored to be ready for reuse; the mode of sheltering from in elasticity chi strip and bar gasbag outer end through the blend stop prevents that bar gasbag use in direct striking target wearing and tearing bar gasbag, has improved bar gasbag's durability.

3. Before use, the connecting rod is lifted upwards and turned for one hundred eighty degrees, so that the connecting rod drives the extrusion strip to leave the rolling main body, the rolling main body is recovered to move, then the control main body is operated to carry out measurement, when a user needs to take down and observe, the connecting rod is operated reversely, so that the extrusion strip is extruded at the outer end of the rolling main body again, the rolling main body is locked by the extrusion strip, the user can keep the position unchanged after taking down and observing, and the observation of the user is facilitated; the handle is convenient for a user to operate the iron block to drive the connecting rod to turn over; the friction force between the winding main body and the guide main body is reduced by using the rotating rod; the connecting rod can better press the extrusion strip downwards to extrude the rolling main body by utilizing the way that the magnet blocks adsorb the iron blocks; through the mode of guide block constraint at rolling main part side, stabilize guide main part, constraint main part and preliminary measurement main part moving state, avoid guide main part, constraint main part and preliminary measurement main part to deflect, improved device measurement stability, during the measurement, the scale value through the rolling main part plus the scale value of scale plate obtains actual measurement value.

Drawings

FIG. 1 is a schematic view of the main structure of the present invention;

FIG. 2 is a schematic view of a rolling main body structure according to the present invention;

FIG. 3 is a schematic structural diagram of a control body according to the present invention;

FIG. 4 is a schematic view of the locking body structure of the present invention;

FIG. 5 is a schematic view of the structure of the guiding body of the present invention;

FIG. 6 is a schematic view of a binding body according to the present invention;

FIG. 7 is a schematic view of the structure of the pre-measured main body of the present invention.

In the figure: 1. a pneumatic tape measure; 2. rolling the main body; 3. a control body; 4. a locking body; 5. a guide body; 6. a restraining body; 7. a pre-measuring main body; 8. blocking strips; 9. an elastic ruler strip; 10. a strip-shaped air bag; 11. an air pump; 12. a housing; 13. cushion blocks; 14. a first switch; 15. a second switch; 16. a connecting rod; 17. a handle; 18. an iron block; 19. extruding the strip; 20. connecting blocks; 21. a spring bar; 22. a limiting block; 23. a first bearing housing; 24. a rotating rod; 25. a second bearing housing; 26. a chute; 27. a bounding frame; 28. a magnet block; 29. a guide groove; 30. a guide block; 31. a scale plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", etc., indicate orientations or positional relationships according to those shown in the drawings, are only for convenience of description and simplicity of description, and are used to enhance the connection between the description and the drawings and to increase the clarity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

Example one

Referring to fig. 1, a device capable of measuring a distance in a narrow space includes an air pump 11, a first switch 14, a second switch 15, and a pneumatic measuring tape 1, where the pneumatic measuring tape 1 includes a winding body 2, a control body 3, a locking body 4, a guiding body 5, a binding body 6, and a pre-measuring body 7, the winding body 2 passes through the guiding body 5 and the binding body 6, the guiding body 5 and the binding body 6 are fixedly connected together, the pre-measuring body 7 is fixedly connected to an inner end of the binding body 6, the winding body 2 is in sliding contact with the pre-measuring body 7, one end of the control body 3 is fixedly connected to the winding body 2, the other end of the control body 3 is slidably supported at a lower end of the winding body 2, an air blowing working circuit of the air pump 11 is electrically connected in series with an external power supply through the first switch 14, an air pumping working circuit of the air pump 11 is electrically connected in series with the external power supply through the second switch 15, the control main body 3 comprises a shell frame 12, the outer end of the air pump 11 is fixedly connected to the side end of the shell frame 12, a first switch 14 and a second switch 15 are fixedly connected through the outer wall of the shell frame 12, the upper end of the air pump 11 is fixedly connected with the winding main body 2, and the inner space of the air pump 11 is communicated with the inner space of the winding main body 2; utilize control main part 3 to aerify to the inside of rolling main part 2, through gas expansion rolling main part 2, make 2 inflation guide main parts of rolling main part 5, make guide main part 5 form to opposite side skew effort, thereby make guide main part 5 slide outward along rolling main part 2, utilize gas to make 2 expansion extension of rolling main part drive guide main part 5, restraint main part 6 and the extension of outside removal of preliminary volume main part 7, and then reach the purpose of self-adaptation measurement, made things convenient for the user to measure in narrow space.

Example two

Referring to fig. 2-3, the rolling main body 2 comprises an elastic ruler strip 9 and a strip-shaped air bag 10, the outer wall of the strip-shaped air bag 10 is fixedly connected to the lower end of the elastic ruler strip 9, the elastic ruler strip 9 and the strip-shaped air bag 10 are inserted into the inner ends of the guiding main body 5 and the binding main body 6, and one end of the lower part of the strip-shaped air bag 10 is fixedly connected with the control main body 3; the air pump 11 is triggered to blow air by manually pressing the first switch 14, and the air pump 11 is used for blowing air to the interior of the strip-shaped air bag 10; the first switch 14 is released and the second switch 15 is pressed, so that the gas in the strip-shaped air bag 10 is extracted through the second switch 15, the purpose of recovering the strip-shaped air bag 10 is achieved, and the handheld operation of a user is facilitated. Through the mode that control main part 3 aerifys to the inside of bar gasbag 10, utilize guide main part 5 to extrude the outer end at elasticity chi strip 9 and bar gasbag 10, make gaseous one end inflation by bar gasbag 10 act on guide main part 5, play the purpose that promotes guide main part 5 and remove, thereby made things convenient for elasticity chi strip 9 to extend work by guide main part 5 demarcation, strip gasbag 10 whole inflation has been avoided, take out the back through the inside gas of control main part 3 with rolling main part 2, again manually with locking main part 4, guide main part 5, restraint main part 6 and preliminary measurement main part 7 position resume and prepare for reuse.

The winding main body 2 further comprises a barrier strip 8, and the barrier strip 8 is fixedly connected to the outer ends of the elastic ruler strip 9 and the strip-shaped air bag 10; the mode of sheltering from in elasticity chi strip 9 and bar gasbag 10 outer end through blend stop 8 prevents that bar gasbag 10 from directly striking target wearing and tearing bar gasbag 10 in the use, has improved bar gasbag 10's durability.

The control main body 3 further comprises a cushion block 13, the lower end of the cushion block 13 is fixedly connected to the upper end of the shell frame 12, and the upper end of the cushion block 13 is slidably supported at the lower end of the rolling main body 2.

EXAMPLE III

Referring to fig. 4, the locking body 4 includes a connecting rod 16, an iron block 18, an extrusion strip 19, a connecting block 20, an elastic strip 21, a limiting block 22 and a first bearing seat 23, one end of the connecting rod 16 is rotatably connected with the first bearing seat 23, the other end of the connecting rod 16 is fixedly connected with the iron block 18, the upper end of the extrusion strip 19 is fixedly connected with the lower end of the connecting rod 16, the upper end of the connecting block 20 is fixedly connected with the side end of the elastic strip 21, the lower end of the connecting block 20 is fixedly mounted at the outer end of the binding body 6, the upper wall of the elastic strip 21 is extruded at the lower wall of the limiting block 22, the connecting block 20 and the connecting rod 16 are fixedly connected into a whole, the lower end of the first bearing seat 23 is fixedly connected with the binding body 6, the extrusion strip 19 is slidably mounted at the inner end of the binding body 6, and the extrusion strip 19 penetrates through the binding body 6 and is extruded with the winding body 2; upwards mention connecting rod 16 and overturn one hundred eighty degrees before using for connecting rod 16 drives extrusion strip 19 and leaves rolling main part 2, make rolling main part 2 resume the removal, then operation control main part 3 carries out measurement work again, when the user need take off the observation, with reverse operation connecting rod 16 make extrusion strip 19 extrude rolling main part 2 outer end again, utilize extrusion strip 19 locking rolling main part 2, the user takes off the observation and can keep the position unchangeable, made things convenient for the user to survey.

The locking body 4 further comprises a handle 17, and the lower end of the handle 17 is fixedly connected to the upper end of an iron block 18; the handle 17 facilitates the user to operate the iron block 18 to drive the connecting rod 16 to perform the overturning work.

Example four

Referring to fig. 5, the guiding body 5 includes a rotating rod 24 and a pair of second bearing seats 25, the rotating rod 24 is provided with a pair of the second bearing seats 25, the second bearing seats 25 are provided at the side portions of the rotating rod 24, the second bearing seats 25 are rotatably connected with the rotating rod 24, the second bearing seats 25 are fixedly installed with the binding body 6, and the rotating rod 24 is extruded at the outer end of the winding body 2; the friction between the winding body 2 and the guide body 5 is reduced by the turn lever 24.

EXAMPLE five

Referring to fig. 6, the binding main body 6 includes a sliding slot 26, a binding frame 27, a magnet block 28 and a guiding slot 29, the sliding slot 26 is hollowed out at the upper end of the binding frame 27, the magnet block 28 is fixedly connected to the upper end of the binding frame 27, the guiding slot 29 is opened at the side end of the binding frame 27, the sliding slot 26 is connected to the inner space of the guiding slot 29 in a penetrating manner, the winding main body 2 is inserted into the inner wall of the guiding slot 29 in a sliding manner, the magnet block 28 is attracted to the locking main body 4 by magnetic force, the binding frame 27 is fixedly connected to the guiding main body 5, and the side end of the guiding slot 29 is fixedly connected to the outer end of the presetting main body 7; the magnet block 28 is used for adsorbing the iron block 18, so that the connecting rod 16 can better press the extrusion strip 19 downwards to extrude the rolling main body 2.

EXAMPLE six

Referring to fig. 7, the pre-measuring body 7 includes a guide block 30 and a scale plate 31, the guide block 30 is symmetrically and fixedly connected to the side end of the scale plate 31, the inner wall of the guide block 30 is in sliding contact with the winding body 2, and the outer end of the scale plate 31 is fixedly connected to the inner end of the binding body 6; through the mode of guide block 30 constraint at 2 side ends of rolling main part, stabilize guide main part 5, constraint main part 6 and the state of movement of preliminary measurement main part 7, avoid guide main part 5, constraint main part 6 and the deflection of preliminary measurement main part 7, improved device measurement stability, during the measurement, the scale value through rolling main part 2 adds the scale value of scale plate 31 and obtains actual measurement.

The working principle is as follows: the control main body 3 is used for inflating the interior of the rolling main body 2, the rolling main body 2 is expanded to guide the main body 5 through gas expansion of the rolling main body 2, the guide main body 5 forms an acting force which is deviated to the other side, so that the guide main body 5 slides along the outside of the rolling main body 2, and the rolling main body 2 is expanded and extended by gas to drive the guide main body 5, the constraint main body 6 and the pre-measurement main body 7 to move and extend outwards, so that the purpose of self-adaptive measurement is achieved, and a user can conveniently measure in a narrow space; the air pump 11 is triggered to blow air by manually pressing the first switch 14, and the air pump 11 is used for blowing air to the interior of the strip-shaped air bag 10; the first switch 14 is released and the second switch 15 is pressed, so that the gas in the strip-shaped air bag 10 is extracted through the second switch 15, the purpose of recovering the strip-shaped air bag 10 is achieved, and the handheld operation of a user is facilitated. The outer ends of the elastic ruler strip 9 and the strip-shaped air bag 10 are extruded by the guide main body 5 in a mode that the control main body 3 inflates the strip-shaped air bag 10, so that gas is expanded from one end of the strip-shaped air bag 10 to act on the guide main body 5 to achieve the purpose of pushing the guide main body 5 to move, the elastic ruler strip 9 is conveniently extended by the boundary of the guide main body 5, the strip-shaped air bag 10 is prevented from being expanded integrally, and after the gas in the winding main body 2 is extracted by the control main body 3, the positions of the locking main body 4, the guide main body 5, the binding main body 6 and the preset main body 7 are manually restored to be ready for reuse; the strip-shaped air bag 10 is prevented from being worn by directly impacting a target in the use process of the strip-shaped air bag 10 in a mode that the blocking strip 8 blocks the outer ends of the elastic ruler strip 9 and the strip-shaped air bag 10, so that the durability of the strip-shaped air bag 10 is improved; before use, the connecting rod 16 is lifted upwards and turned over one hundred eighty degrees, so that the connecting rod 16 drives the extrusion strip 19 to leave the rolling main body 2, the rolling main body 2 recovers movement, then the control main body 3 is operated to perform measurement, when a user needs to take down and observe, the connecting rod 16 is operated reversely, so that the extrusion strip 19 is extruded at the outer end of the rolling main body 2 again, the rolling main body 2 is locked by the extrusion strip 19, the user can keep the position unchanged after taking down and observing, and the observation of the user is facilitated; the handle 17 is convenient for a user to operate the iron block 18 to drive the connecting rod 16 to turn over; the friction between the winding body 2 and the guiding body 5 is reduced by means of the turning bar 24; the connecting rod 16 can better press the extrusion strip 19 downwards to extrude the rolling main body 2 by utilizing the way that the magnet block 28 adsorbs the iron block 18; through the mode of guide block 30 constraint at 2 side ends of rolling main part, stabilize guide main part 5, constraint main part 6 and the state of movement of preliminary measurement main part 7, avoid guide main part 5, constraint main part 6 and the deflection of preliminary measurement main part 7, improved device measurement stability, during the measurement, the scale value through rolling main part 2 adds the scale value of scale plate 31 and obtains actual measurement.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.