Measuring scale

Abstract

The utility model relates to the technical field of measuring rulers, and discloses a measuring ruler which comprises a protective box, a cavity with an opening at one end is arranged in the protective box, a main ruler and an auxiliary ruler are arranged in the cavity, a groove with an opening at one end is arranged at the opening of the cavity, a blocking plate is arranged in the groove, a driving assembly is arranged in the protective box, and a fixing block is arranged on the upper end face of the protective box. A fixing groove is formed in the upper end face of the fixing block, a first notch is formed in one end face of the fixing block, a second notch is formed in the other end face of the fixing block, and a positioning assembly is arranged on the upper end face of the protection box. Through the structure, the main ruler and the auxiliary ruler are put into the cavity from the opening of the cavity, and the driving assembly drives the blocking plate to close the opening of the cavity, so that the main ruler and the auxiliary ruler are protected by the protection box, and the situation that the surfaces of the main ruler and the auxiliary ruler are collided, so that scales on the main ruler and the auxiliary ruler are not clear is avoided; and the measurement operation of workers is influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring rulers, in particular to a measuring ruler. Background Art

[0002] Civil engineering is a general term for the science and technology of building various land engineering facilities, which refers to the materials, equipment used and the technical activities such as survey, design, construction, maintenance and repair carried out. Various measuring devices are often used in civil engineering, among which measuring rulers are used very frequently. Measuring rulers are needed for drawing drawings, measuring the length of plates and other tasks.

[0003] For example, a civil engineering ruler disclosed in the patent with publication number CN211696109U has the advantages of good stability, not easily slipping between the measured object, high compactness after folding, not easy to loosen, convenient control, not easy to fall off, able to determine the horizontal value, and high measurement accuracy; however, when the civil engineering ruler is not used for a long time, the staff will place the civil engineering ruler in a storage box for storage, and other items will usually be stored in the storage box. When the staff is moving the storage box, the items in the storage box will collide with the scales on the first scale and the second scale, thereby causing the scales on the first scale and the second scale to be worn, so that when the staff uses the first scale and the second scale to measure again, the scales on the first scale and the second scale will be blurred, thereby affecting the staff's measurement work, so there is room for improvement. Utility Model Content

[0004] The purpose of the utility model is to provide a measuring ruler to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A measuring ruler comprises a protective box, wherein a cavity with an opening at one end is provided in the protective box, a main ruler and a secondary ruler for measuring are provided in the cavity, a groove with an opening at one end is provided at the opening of the cavity, a blocking plate is provided in the groove, a driving component for driving the blocking plate to close the opening of the cavity is provided in the protective box, a fixing block is provided on the upper end surface of the protective box, a fixing groove is provided on the upper end surface of the fixing block along the length direction thereof, a first notch is provided on one end surface of the fixing block for the main ruler to extend into the fixing groove, a second notch is provided on the other end surface of the fixing block for the secondary ruler to extend into the fixing groove, and a positioning component for positioning the main ruler and the secondary ruler in the fixing groove is provided on the upper end surface of the protective box.

[0007] Preferably, a mounting groove is provided on the side wall of the protection box, a connecting groove connected to the mounting groove is provided on the bottom wall of the groove, the connecting groove and the mounting groove are arranged parallel to each other, and a closing plate for closing the opening of the mounting groove is provided at the opening of the mounting groove;

[0008] The driving assembly includes a connecting plate arranged on the blocking plate, one end of the connecting plate passes through the connecting groove and extends into the installation groove, a circular plate is provided on the connecting plate located in the installation groove, and a spring is provided between the circular plate and the closing plate. The spring is used to move the circular plate away from the closing plate so that the blocking plate can close the opening of the cavity.

[0009] Preferably, a through slot connected to the fixing slot is provided on the outer side wall of the fixing block, and a first plug hole and a second plug hole are provided on the side walls of the main scale and the auxiliary scale respectively;

[0010] The positioning assembly includes a movable plate which is arranged on the upper end surface of the protective box, and a first plug rod and a second plug rod are arranged on the side wall of the movable plate facing the through groove. The movable plate moves to pass the first plug rod and the second plug rod through the through groove and inserts them into the corresponding first plug hole and the second plug hole to realize the positioning of the main scale and the auxiliary scale in the fixed groove, and a movable part for driving the movable plate to move is arranged in the protective box.

[0011] Preferably, a driving groove is provided on the side wall of the protection box, a driving plate for closing the opening of the driving groove is provided at the opening of the driving groove, a moving groove connected to the driving groove is provided on the upper end surface of the protection box, and the moving groove and the driving groove are arranged parallel to each other;

[0012] The moving part includes a moving rod arranged on the moving plate, one end of the moving rod passes through the moving groove and extends into the driving groove, a threaded plate is provided on the moving rod located in the driving groove, and a screw rod with one end threaded through the threaded plate is provided on the bottom wall of the driving cavity, one end of the screw rod passes through the driving plate and extends out of the driving groove, the screw rod is rotated to drive the threaded plate to move in the driving groove, and the movement of the threaded plate drives the moving rod to move along the moving groove, thereby realizing the movement of the moving plate on the protective box.

[0013] Preferably, a handle for driving the screw to rotate is provided on the protruding end of the screw.

[0014] Preferably, a card block is provided on the side wall of the fixing groove along its length direction, a first card slot with one end open for the card block to be inserted into is provided on the side wall of the main ruler, and a second card slot with one end open for the card block to be inserted into is provided on the side wall of the auxiliary ruler.

[0015] Preferably, a positioning groove for inserting the first insertion rod and the second insertion rod is formed on the side wall of the main ruler.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The utility model, by placing the main scale and the auxiliary scale into the cavity from the opening of the cavity, and then driving the blocking plate to close the opening of the cavity through the driving component, realizes the protection of the main scale and the auxiliary scale by the protective box. Compared with the existing ones, this kind of measuring ruler can avoid the surfaces of the main scale and the auxiliary scale from being bumped during actual use, resulting in unclear scales on the main scale and the auxiliary scale, thereby affecting the measurement work of the staff, and has good practicality.

[0018] 2. The utility model positions the main ruler and the auxiliary ruler in the fixed groove through the positioning assembly, so as to achieve the docking of the main ruler and the auxiliary ruler, so that the staff can measure longer objects through the main ruler and the auxiliary ruler, which is more practical when used. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a structural schematic diagram of a measuring ruler.

[0020] Figure 2 It is a structural schematic diagram of the protection box in the utility model.

[0021] Figure 3 It is a schematic cross-sectional structural diagram of the driving component in the utility model.

[0022] Figure 4 It is a schematic diagram of the explosion structure of the blocking plate and the protection box in the utility model.

[0023] Figure 5 It is a schematic diagram of the exploded structure of the positioning component in the utility model.

[0024] Figure 6 It is a structural schematic diagram of the main ruler in the utility model.

[0025] Figure 7 It is a structural schematic diagram of the auxiliary ruler in the utility model.

[0026] The meaning of the symbols in the figure is:

[0027] 100, protective box; 101, blocking plate; 110, main ruler; 120, auxiliary ruler; 130, fixed block; 140, movable plate; 150, handle; 160, handrail;

[0028] 201, fixing slot; 202, first slot; 203, second slot; 210, clamping block;

[0029] 301, cavity; 302, mounting groove; 303, connecting groove; 310, closing plate; 320, connecting plate; 321, circular plate; 330, spring;

[0030] 401, groove; 402, limiting groove; 410, limiting plate;

[0031] 501, through slot; 510, first plug rod; 511, second plug rod; 521, drive slot; 522, moving slot; 530, drive plate; 540, moving rod; 541, threaded plate; 550, screw rod;

[0032] 601, first plug hole; 602, first card slot; 603, positioning slot;

[0033] 701, second jack; 702, second card slot. DETAILED DESCRIPTION

[0034] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are only used to explain the utility model but not to limit it.

[0035] The following is combined with Figure 1-Figure 7 This embodiment is described in further detail.

[0036] like Figure 1 As shown, a measuring ruler in this embodiment includes a protective box 100, a cavity 301 with an opening at one end is provided in the protective box 100, a main ruler 110 and a secondary ruler 120 for measuring are provided in the cavity 301, a groove 401 with an opening at one end is provided at the opening of the cavity 301, a blocking plate 101 is provided in the groove 401, a driving component for driving the blocking plate 101 to close the opening of the cavity 301 is provided in the protective box 100, and a A fixing block 130 is provided, and a fixing groove 201 is provided on the upper end surface of the fixing block 130 along its length direction. A first notch 202 in the fixing groove 201 for the main ruler 110 to extend into is provided on one end surface of the fixing block 130, and a second notch 203 in the fixing groove 201 for the secondary ruler 120 to extend into is provided on the other end surface of the fixing block 130. A positioning component for positioning the main ruler 110 and the secondary ruler 120 in the fixing groove 201 is provided on the upper end surface of the protective box 100.

[0037] In this embodiment, the secondary ruler 120 extends into the fixing groove 201 through the second notch 203, and the main ruler 110 extends into the fixing groove 201 through the first notch 202, so that the side wall of the main ruler 110 and the side wall of the secondary ruler 120 are abutted in the fixing groove 201, and the abutment of the main ruler 110 and the secondary ruler 120 is positioned by the positioning component to achieve the docking and fixation of the main ruler 110 and the secondary ruler 120 in the fixing groove 201. Then, the staff can measure a long object through the cooperation of the main ruler 110 and the secondary ruler 120, so that the practicality of the measuring ruler is strong; when the measurement is completed, the positioning of the main ruler 110 and the secondary ruler 120 by the positioning component is released, so that the main ruler 110 can be moved from the first The slot 202 slides out, and the secondary ruler 120 can slide out from the second slot 203. At this time, the main ruler 110 and the secondary ruler 120 are placed into the cavity 301 from the opening of the cavity 301, and the blocking plate 101 is driven by the driving component to move in the groove 401, and the opening of the cavity 301 is closed, so that the main ruler 110 and the secondary ruler 120 cannot slide out from the opening of the cavity 301, thereby realizing the protection of the main ruler 110 and the secondary ruler 120 by the protective box 100. Compared with the existing ones, this kind of measuring ruler can avoid the surfaces of the main ruler 110 and the secondary ruler 120 from being bumped during actual use, resulting in unclear scales on the main ruler 110 and the secondary ruler 120, thereby affecting the measurement operation of the staff, and has good practicality;

[0038] When the main ruler 110 and the auxiliary ruler 120 are positioned in the fixing groove 201 by the positioning assembly, the upper ends of the main ruler 110 and the auxiliary ruler 120 extend out of the fixing groove 201, and scales are engraved on the extended ends of the main ruler 110 and the auxiliary ruler 120, thereby preventing the scales on the main ruler 110 and the auxiliary ruler 120 from being located in the fixing groove 201, which affects the staff's observation of the scales;

[0039] When the main scale 110 and the secondary scale 120 are located in the cavity 301, one end wall of the main scale 110 and the secondary scale 120 abuts against the side wall of the cavity 301, and when the blocking plate 101 closes the opening of the cavity 301, the side wall of the blocking plate 101 abuts against the other end wall of the main scale 110 and the secondary scale 120, so as to limit the main scale 110 and the secondary scale 120 of the cavity 301, thereby preventing the main scale 110 and the secondary scale 120 from shaking in the cavity 301 and rubbing against the side wall of the cavity 301, causing wear on the scales on the main scale 110 and the secondary scale 120;

[0040] In actual use, when the main ruler 110 and the secondary ruler 120 are positioned in the fixing groove 201, the staff needs to move the protection box 100 to move the main ruler 110 and the secondary ruler 120 to the appropriate position to measure the object. An armrest 160 is fixedly installed on the lower end surface of the protection box 100. The staff moves the protection box 100 through the armrest 160, which makes it more convenient for the staff to use.

[0041] like Figure 1-4 As shown, in this embodiment, a mounting groove 302 is provided on the side wall of the protective box 100, a connecting groove 303 connected to the mounting groove 302 is provided on the bottom wall of the groove 401, the connecting groove 303 and the mounting groove 302 are arranged parallel to each other, and a closing plate 310 for closing the opening of the mounting groove 302 is provided at the opening of the mounting groove 302;

[0042] The driving assembly includes a connecting plate 320 arranged on the blocking plate 101, one end of the connecting plate 320 passes through the connecting groove 303 and extends into the mounting groove 302, a circular plate 321 is provided on the connecting plate 320 located in the mounting groove 302, and a spring 330 is provided between the circular plate 321 and the closing plate 310, and the spring 330 is used to move the circular plate 321 away from the closing plate 310, so that the blocking plate 101 closes the opening of the cavity 301.

[0043] When the closure plate 310 is in the closed position, the closure plate 310 is in the closed position, and ...

[0044] The closing plate 310 closes the opening of the installation slot 302 so that the spring 330 in the installation slot 302 can be installed;

[0045] During actual use, a limiting groove 402 with an open end is provided on the side wall opposite to the groove 401 along the moving direction of the blocking plate 101, and a limiting plate 410 which is inserted into the corresponding limiting groove 402 is fixedly installed on the side wall opposite to the blocking plate 101 along its moving direction. By inserting the limiting plate 410 into the limiting groove 402, the movement of the blocking plate 101 in the groove 401 is more stable and the use effect is better.

[0046] like Figure 1-7 As shown, in this embodiment, a through slot 501 communicating with the fixing slot 201 is formed on the outer wall of the fixing block 130, and a first plug hole 601 and a second plug hole 701 are formed on the side walls of the main scale 110 and the auxiliary scale 120, respectively;

[0047] The positioning assembly includes a movable plate 140 which is arranged on the upper end surface of the protective box 100 and is movable. The first insertion rod 510 and the second insertion rod 511 are arranged on the side wall of the movable plate 140 facing the through groove 501. The movable plate 140 moves to pass the first insertion rod 510 and the second insertion rod 511 through the through groove 501, and inserts them into the corresponding first insertion hole 601 and the second insertion hole 701, so as to realize the positioning of the main scale 110 and the secondary scale 120 in the fixed groove 201. A movable part for driving the movable plate 140 to move is arranged in the protective box 100.

[0048] In this embodiment, by setting the through slot 501, the first plug hole 601, the second plug hole 701, the movable plate 140, the first plug rod 510, the second plug rod 511 and the movable member, the first plug rod 510 is fixedly installed on the movable plate 140, and the second plug rod 511 is fixedly installed on the movable plate 140. When the main scale 110 and the secondary scale 120 are located in the fixed slot 201, the movable plate 140 is driven to move by the movable member, so that the first plug rod 510 and the second plug rod 511 on the movable plate 140 both pass through the fixed slot 201 and are inserted into the first plug hole 601 and the second plug hole 701, so that the main scale 110 and the secondary scale 120 can be positioned in the installation slot 302, and the main scale 110 and the secondary scale 120 can be docked.

[0049] When the main ruler 110 and the secondary ruler 120 are in the installation groove 302, it is necessary to ensure that the first insertion hole 601 of the main ruler 110 corresponds to the first insertion rod 510 on the movable plate 140, and the second insertion hole 701 on the secondary ruler 120 corresponds to the second insertion rod 511 on the movable plate 140. A clamping block 210 is fixedly installed on the side wall of the fixed groove 201 along its length direction. A first clamping groove 602 for clamping the clamping block 210 and having one end open is provided on the side wall of the main ruler 110, and a second clamping groove 702 for clamping the clamping block 210 and having one end open is provided on the side wall of the secondary ruler 120. By sliding the secondary ruler 120 from the second notch 203 into the fixed groove 201 , so that the side wall of the second card slot 702 abuts against the card block 210, at this time, the second plug hole 701 on the secondary scale 120 corresponds to the second plug rod 511, and then, the main scale 110 is slid from the first notch 202 into the fixed slot 201, so that the side wall of the main scale 110 abuts against the secondary scale 120, at this time, the first plug hole 601 on the main scale 110 corresponds to the first plug rod 510, and the moving member drives the moving plate 140 to move, so that the first plug rod 510 and the second plug rod 511 on the moving plate 140 can be just inserted into the first plug hole 601 and the second plug hole 701, so as to realize the positioning of the main scale 110 and the secondary scale 120 in the fixed slot 201;

[0050] When it is actually used, a positioning groove 603 is provided on the side wall of the main ruler 110 for the first insertion rod 510 and the second insertion rod 511 to be inserted. When the staff member measures a shorter length of the object, the staff member can measure the object through the main ruler 110. By taking the main ruler 110 out of the cavity 301, the main ruler 110 slides from the first notch 202 into the fixed groove 201, so that the side wall of the block 210 abuts against the side wall of the first slot 602. At this time, the positioning groove 603 corresponds to the through-groove 501, and the moving part drives the moving plate 140 to move. The first insertion rod 510 and the second insertion rod 511 on the moving plate 140 pass through the through-groove 501, and the side walls of the first insertion rod 510 and the second insertion rod 511 abut against the side walls at both ends of the positioning groove 603, thereby realizing the positioning of the main ruler 110 in the fixed groove 201. At this time, the staff member can measure the object through the main ruler 110, which is more practical.

[0051] like Figure 1-7 As shown, in this embodiment, a driving groove 521 is provided on the side wall of the protection box 100, and a driving plate 530 for closing the opening of the driving groove 521 is provided at the opening of the driving groove 521. A moving groove 522 connected to the driving groove 521 is provided on the upper end surface of the protection box 100, and the moving groove 522 and the driving groove 521 are arranged parallel to each other;

[0052] The moving part includes a moving rod 540 arranged on the moving plate 140, one end of the moving rod 540 passes through the moving groove 522 and extends into the driving groove 521, a threaded plate 541 is provided on the moving rod 540 located in the driving groove 521, and a screw rod 550 with one end threaded through the threaded plate 541 is provided on the bottom wall of the driving cavity, one end of the screw rod 550 passes through the driving plate 530 and extends into the outside of the driving groove 521, the screw rod 550 rotates to drive the threaded plate 541 to move in the driving groove 521, the movement of the threaded plate 541 drives the moving rod 540 to move along the moving groove 522, thereby realizing the movement of the moving plate 140 on the protective box 100.

[0053] When the screw rod 550 is rotated, the threaded plate 541 and the screw rod 550 are threadedly matched, and the threaded plate 541 and the screw rod 550 are threadedly matched, and the threaded plate 541 and the screw rod 550 are threadedly matched, and the threaded plate 541 will move along the screw rod 550, and the movement of the threaded plate 541 drives the moving rod 540 to move along the moving groove 522, so as to realize the movement of the moving plate 140 on the upper end surface of the protective box 100. At the same time, the moving plate 140 can maintain the position after the movement, and the main scale 110 and the auxiliary scale 120 in the fixed groove 201 are continuously positioned.

[0054] The screw rod 550 is installed on the bottom wall of the driving groove 521 through a bearing seat, and one end of the screw rod 550 is arranged to penetrate the driving plate 530, so that the screw rod 550 is rotatably installed in the driving groove 521, and at the same time, the rotation of the screw rod 550 is more stable;

[0055] When it is actually used, a handle 150 for driving the screw rod 550 to rotate is fixedly installed on the protruding end of the screw rod 550. The staff can better drive the screw rod 550 to rotate through the handle 150, which is more convenient to use.

[0056] Working principle: First, the secondary ruler 120 extends into the fixed groove 201 through the second notch 203, and the main ruler 110 extends into the fixed groove 201 through the first notch 202, so that the side wall of the main ruler 110 and the side wall of the secondary ruler 120 abut against each other in the fixed groove 201, and then, the screw rod 550 is driven to rotate by the handle 150, and the rotation of the screw rod 550 drives the threaded plate 541 to move, and the movement of the threaded plate 541 drives the moving rod 540 to move along the moving groove 522, and the first plug rod 510 and the second plug rod 511 on the moving plate 140 are inserted into the first plug hole 601 and the second plug hole 701, so as to realize the positioning of the main ruler 110 and the secondary ruler 120 in the fixed groove 201. At this time, the staff can move the protective box 100 through the handrail 160, and measure the object through the main ruler 110 and the secondary ruler 120, and complete the object measurement. After measuring the product, the handle 150 drives the screw rod 550 to rotate, so that the first plug rod 510 and the second plug rod 511 on the movable plate 140 slide out from the first hole 601 and the second hole 701, and then, the main scale 110 slides out from the first slot 202, and the secondary scale 120 slides out from the second slot 203. At this time, the staff pushes the blocking plate 101 to slide toward the opening of the groove 401 to release the closure of the cavity 301 by the blocking plate 101, and then puts the main scale 110 and the secondary scale 120 into the cavity 301 from the opening of the cavity 301. Finally, the staff releases the blocking plate 101, and the spring 330 pushes the blocking plate 101 to automatically close the opening of the cavity 301, thereby realizing the protection of the main scale 110 and the secondary scale 120 by the protective box 100, thereby avoiding damage caused by bumps on the surfaces of the main scale 110 and the secondary scale 120.

[0057] In short, the above is only a preferred embodiment of the present utility model, and all equivalent changes and modifications made according to the scope of the patent application of the present utility model should fall within the scope of the present utility model patent.

Claims

1. A measuring ruler, characterized in that: The invention comprises a protection box (100), wherein a cavity (301) with an opening at one end is provided in the protection box (100), a main scale (110) and a secondary scale (120) for measuring are provided in the cavity (301), a groove (401) with an opening at one end is provided at the opening of the cavity (301), a blocking plate (101) is provided in the groove (401), a driving component for driving the blocking plate (101) to close the opening of the cavity (301) is provided in the protection box (100), and a fixing block (130) is provided on the upper end surface of the protection box (100). ), a fixing groove (201) is provided on the upper end surface of the fixing block (130) along its length direction, a first notch (202) is provided on one end surface of the fixing block (130) for the main ruler (110) to extend into the fixing groove (201), a second notch (203) is provided on the other end surface of the fixing block (130) for the auxiliary ruler (120) to extend into the fixing groove (201), and a positioning component for positioning the main ruler (110) and the auxiliary ruler (120) in the fixing groove (201) is provided on the upper end surface of the protective box (100).

2. A measuring ruler according to claim 1, characterized in that: A mounting groove (302) is provided on the side wall of the protection box (100), a connecting groove (303) connected to the mounting groove (302) is provided on the bottom wall of the groove (401), the connecting groove (303) and the mounting groove (302) are arranged parallel to each other, and a closing plate (310) for closing the opening of the mounting groove (302) is provided at the opening of the mounting groove (302); The driving assembly comprises a connecting plate (320) arranged on the blocking plate (101), one end of the connecting plate (320) passes through the connecting groove (303) and extends into the mounting groove (302), a circular plate (321) is arranged on the connecting plate (320) located in the mounting groove (302), a spring (330) is arranged between the circular plate (321) and the closing plate (310), and the spring (330) is used to move the circular plate (321) away from the closing plate (310) so as to enable the blocking plate (101) to close the opening of the cavity (301).

3. A measuring ruler according to claim 1, characterized in that: A through slot (501) communicating with the fixing slot (201) is provided on the outer side wall of the fixing block (130), and a first plug hole (601) and a second plug hole (701) are provided on the side walls of the main scale (110) and the auxiliary scale (120), respectively; The positioning assembly comprises a movable plate (140) which is arranged on the upper end surface of the protective box (100) and is movable. A first plug rod (510) and a second plug rod (511) are arranged on the side wall of the movable plate (140) facing the through groove (501). The movable plate (140) moves to make the first plug rod (510) and the second plug rod (511) pass through the through groove (501) and insert into the corresponding first plug hole (601) and the second plug hole (701), so as to realize the positioning of the main scale (110) and the auxiliary scale (120) in the fixed groove (201). A movable part for driving the movable plate (140) to move is arranged in the protective box (100).

4. A measuring ruler according to claim 3, characterized in that: A driving groove (521) is provided on the side wall of the protection box (100); a driving plate (530) for closing the opening of the driving groove (521) is provided at the opening of the driving groove (521); a moving groove (522) connected to the driving groove (521) is provided on the upper end surface of the protection box (100); the moving groove (522) and the driving groove (521) are arranged parallel to each other; The moving member comprises a moving rod (540) arranged on the moving plate (140), one end of the moving rod (540) passes through the moving groove (522) and extends into the driving groove (521), a threaded plate (541) is arranged on the moving rod (540) located in the driving groove (521), a screw rod (550) with one end threadedly passing through the threaded plate (541) is arranged on the bottom wall of the driving cavity, one end of the screw rod (550) passes through the driving plate (530) and extends into the outside of the driving groove (521), the screw rod (550) rotates to drive the threaded plate (541) to move in the driving groove (521), the movement of the threaded plate (541) drives the moving rod (540) to move along the moving groove (522), so that the moving plate (140) is moved on the protective box (100).

5. A measuring ruler according to claim 4, characterized in that: A handle (150) for driving the screw rod (550) to rotate is provided on the protruding end of the screw rod (550).

6. A measuring ruler according to claim 3, characterized in that: A clamping block (210) is provided on the side wall of the fixing groove (201) along its length direction, a first clamping groove (602) is provided on the side wall of the main ruler (110) for clamping the clamping block (210) and having one end open, and a second clamping groove (702) is provided on the side wall of the auxiliary ruler (120) for clamping the clamping block (210) and having one end open.

7. A measuring ruler according to claim 6, characterized in that: A positioning groove (603) for inserting the first insertion rod (510) and the second insertion rod (511) is provided on the side wall of the main ruler (110).

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