A special construction surveying ruler for buildings

Abstract

The present invention relates to the field of surveying and mapping technology for building construction, and discloses a special construction surveying ruler for building construction, comprising a housing, a reel rotatably connected to the housing, and a measuring ruler wound on the reel, both sides of the housing are provided with reinforcement mechanisms for supporting the pulled-out portion of the measuring ruler, each set of side housings is rotatably connected to a first shaft rod, each set of first shaft rods is also fixed with a winding reel, each set of winding reels is horizontally wound with a steel belt, wherein one end of the steel belt is fixed to the winding reel, the other end of the steel belt is passed through the outside of the side housing and fixed to a hook, and the other end of the steel belt is in contact with the two side edges of the pulled-out portion of the measuring ruler. The special construction surveying ruler for building construction is provided with a reinforcement mechanism, so that when the measuring ruler is about to collapse downward, the steel belt can provide additional resistance, thereby improving the stability of the measuring ruler and preventing instability when subjected to a vertical load.

Description

Technical Field

[0001] The invention relates to the technical field of building construction surveying and mapping, and in particular to a special building construction surveying and mapping ruler. Background Art

[0002] The surveying and mapping of construction projects cannot be separated from surveying rulers. Currently, surveying rulers include tape measures, rulers, etc. The main feature of tape measures is that they can be wound and stretched, which facilitates the measurement of various lengths and angles. When the tape is stretched or extended, the steel tape or plastic tape will undergo elastic deformation, and the scale on the tape will move accordingly. By reading the scale on the tape, the length of the object can be determined.

[0003] The existing publication number CN108955443A discloses a reinforced locking structure for a tape measure, which includes a shell of the tape measure and a brake block. A first notch is concavely provided on the inner side of the upper part of the brake block, and a stop block corresponding to the first notch is convexly provided on the inner wall of the shell. A reinforced locking block that can limit the rotation of the brake block is inserted in the upper part of the brake block so as to be movable up and down. A corresponding second notch is provided on the inner side of the reinforced locking block, and a stop block is provided at the upper end of the second notch of the reinforced locking block. When the reinforced locking block is pushed down, the stop block falls into the first notch and is limited by the stop block to achieve locking of the tape.

[0004] Although the above technical solution can effectively solve the technical problem that the tape cannot be locked in the pulling direction, so that the tape measure can be suitable for use in various occasions, in the prior art, since the material of the tape measure has a certain elastic limit, when the tape measure is pulled to a certain length, the metal or plastic material inside it may exceed its elastic limit, causing the material to deform, thereby causing the problem of collapse. The collapse of the tape measure makes the measurement process difficult, especially when measuring a long distance, single-person operation becomes more difficult. For projects or work that require precise measurement, the collapse of the tape measure may result in the failure to achieve the required accuracy standard. At present, in order to avoid the collapse of the tape measure, it is usually chosen to add a supporting structure inside the tape measure, such as a metal skeleton or ribs, to provide additional support, or to apply a special coating on the surface of the tape measure. However, the internal support may interfere with the normal curling process of the tape measure, causing the tape measure to be difficult to roll up neatly or to produce wrinkles when rolling up. Although applying a special coating can enhance its ability to resist deformation, the coating is prone to wear during use, resulting in shedding, thereby reducing the durability and service life of the tape measure. Therefore, a new type of construction-specific surveying ruler is needed to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a special construction surveying ruler for solving the problems raised in the above background technology.

[0006] The invention provides a special construction surveying ruler for buildings, which adopts the following technical scheme:

[0007] A construction surveying ruler for building, comprising a housing, a reel rotatably connected to the housing, and a measuring ruler wound on the reel, the housing being provided with a ruler outlet, one end of the measuring ruler being passed through the ruler outlet and being fixed with a hook, a brake member for controlling the reel to reset and rotate and a stopper for abutting the measuring ruler being provided in the housing;

[0008] The two sides of the shell are provided with reinforcement mechanisms for supporting the pulling-out part of the measuring ruler, and the reinforcement mechanisms include side shells symmetrically fixed on the two sides of the shell, each group of the side shells is rotatably connected with a first shaft rod, and each group of the first shaft rods is provided with a torsion spring for resetting, and each group of the first shaft rods is also fixed with a winding disk, and each group of the winding disks is transversely wound with a steel belt, wherein one end of the steel belt is fixed to the winding disk, and the other end of the steel belt is passed through the outside of the side shell and fixed to the hook, and the other end of the steel belt abuts against the two side edges of the pulling-out part of the measuring ruler, and a guide mechanism for controlling the steel belt to abut against the two side edges of the measuring ruler is provided outside the shell, and the guide mechanism includes a front shell fixed outside the shell and a cover plate provided on the top of the front shell, and a channel for the measuring ruler to pass through and a track for guiding the steel belt are opened in the front shell.

[0009] Furthermore, the tracks are symmetrically arranged on both sides of the front shell, and the two symmetrically arranged tracks are connected to the channel, wherein the ends of the tracks and the channel close to the shell are the inlet ends of the steel belt and the measuring ruler, respectively, and the ends of the tracks and the channel away from the shell are the outlet ends of the steel belt and the measuring ruler, respectively. The outlet and inlet ends of each group of the tracks are rotatably connected to the first guide wheel through the first rotating rod, and the corners in each group of the tracks are rotatably connected to multiple groups of second guide wheels through the second rotating rod, and each group of the second guide wheels and the first guide wheels are respectively abutted against the side of the steel belt away from the measuring ruler;

[0010] A supporting mechanism is arranged at the outlet end of the channel, and the supporting mechanism comprises a bracket arranged at the outlet end of the channel and reciprocating components arranged at both sides of the bracket.

[0011] Furthermore, a shell cover is provided on the top of the side shell body, and two ends of the torsion spring are respectively welded between the inner wall of the shell cover and the outer wall of the winding disk, and the torsion spring is wound around the first shaft rod.

[0012] Furthermore, two reinforcing ribs are embedded in one side of the steel belt close to the measuring ruler, and the two reinforcing ribs are respectively located at upper and lower positions of both side edges of the measuring ruler.

[0013] Furthermore, the reinforcing ribs may be spring steel bars.

[0014] Furthermore, the winding reel is designed to be elliptical.

[0015] Furthermore, the reciprocating assembly includes an L-shaped connecting rod fixed on both sides of the bracket, a rack plate is fixed to the end of the L-shaped connecting rod away from the bracket, and movable grooves for the L-shaped connecting rod and the rack plate to move are opened on both sides of the front shell body, wherein the bottom of the two groups of first rotating rods located at the exit end of the track are fixed with first gears, and the sides of the two groups of first gears away from each other are meshed with second gears, and the second gears are rotatably connected in the movable groove through a rotating shaft, and the two groups of the second gears are respectively meshed with the corresponding rack plates, and buffer parts are provided on both sides of each group of rack plates.

[0016] Furthermore, the buffer component includes buffer tooth blocks symmetrically arranged on both sides of the rack plate, a connecting block is fixed on the top of the buffer tooth block, a fixed seat is symmetrically fixed on the top of the rack plate, a fixing rod is fixed on the fixed seat, the connecting block is movably sleeved outside the fixing rod, a spring is also wound outside the fixing rod, and both ends of the spring are respectively welded between the connecting block and the fixing seat.

[0017] Furthermore, a stopper is fixed to one end of the fixing rod away from the fixing seat.

[0018] Furthermore, a sliding block is symmetrically fixed to the bottom of the bracket, and a sliding groove for limiting the sliding of the sliding block is formed on the inner wall of the channel.

[0019] Beneficial effects of the present invention:

[0020] 1. By providing a reinforcement mechanism and a guide mechanism, when the measuring ruler is pulled out for use, the hook can pull the steel belt out at the same time, and under the action of the guide mechanism, the pulled-out part of the steel belt can abut against the two side edges of the pulled-out part of the measuring ruler, so that it can be pulled out together with the measuring ruler for use. Since the measuring ruler has the potential energy to collapse downward after being pulled out for a long distance, and the winding mode of the steel belt is set horizontally, when the measuring ruler is about to collapse downward, the steel belt can provide additional resistance, improve the stability of the measuring ruler, and prevent instability when subjected to vertical loads. The steel belt provides support force for the two side edges of the measuring ruler, thereby reducing the deformation of the measuring ruler and keeping the measuring ruler in a straight line, thereby ensuring the measurement accuracy. At the same time, it can be convenient for a single person to operate, reducing multiple measurements and readjustments caused by instability.

[0021] 2. By providing a supporting mechanism and a reciprocating assembly, when the steel belt is pulled out, the abutment between the steel belt and the first guide wheel causes the first guide wheel and the first rotating rod to rotate together, thereby controlling the rotation of the first gear to further drive the bracket to move outward, and controlling the bracket to move outward to support the bottom of the starting point of the pulled-out part of the measuring ruler, thereby preventing the measuring ruler from sagging from the starting point to a certain extent, maintaining the linearity of the tape measure, and being able to limit the distance between the measuring ruler and the steel belt through the bracket, so that the steel belt can be closely abutted against the edges on both sides of the measuring ruler. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 It is a schematic cross-sectional view of the three-dimensional structure of the housing of the present invention;

[0024] Figure 3 It is a schematic cross-sectional view of the three-dimensional structure of the reinforcement mechanism and the guide mechanism of the present invention;

[0025] Figure 4 It is a schematic exploded view of the three-dimensional structure of the reinforcement mechanism of the present invention;

[0026] Figure 5 It is a partial three-dimensional structural schematic diagram of the measuring ruler, hook and steel belt of the present invention;

[0027] Figure 6 It is a schematic diagram of the side view structure of the measuring ruler and the steel belt of the present invention;

[0028] Figure 7 For the present invention Figure 3 A schematic diagram of the structure enlargement in the middle;

[0029] Figure 8 It is a schematic diagram of a partial top view of the structure section of the guide mechanism of the present invention;

[0030] Fig. 9 It is a partial three-dimensional structural schematic diagram of the guide mechanism of the present invention;

[0031] Fig.10 It is a schematic diagram of the three-dimensional structure of the guide mechanism of the present invention;

[0032] Fig.11 It is a schematic diagram of the three-dimensional structure of the front housing, the first guide wheel, the first rotating rod, the supporting mechanism and the reciprocating assembly of the present invention;

[0033] Fig.12 It is a three-dimensional structural schematic diagram of the supporting mechanism and the reciprocating assembly of the present invention;

[0034] Fig.13 It is a three-dimensional structural schematic diagram of the reciprocating assembly and the buffer member of the present invention;

[0035] Fig.14 It is a schematic exploded view of the three-dimensional structure of the front housing and the bracket of the present invention.

[0036] In the figure:

[0037] 1. Shell; 2. Reel; 3. Measuring ruler; 4. Hook; 5. Brake; 6. Stopper; 11. Side shell; 12. First shaft rod; 13. Torsion spring; 14. Winding reel; 15. Steel belt; 151. Reinforcement rib; 16. Shell cover; 21. Front shell; 22. Cover plate; 23. Channel; 24. Track; 25. First guide wheel; 26. First rotating rod; 27. Second guide wheel; 28. Second rotating rod; 31. Bracket; 311. Slider; 32. L-shaped connecting rod; 33. Rack plate; 331. Buffer tooth block; 332. Connecting block; 333. Fixed seat; 334. Fixed rod; 335. Spring; 34. Movable groove; 35. First gear; 36. Second gear; 37. Rotating axis. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0039] Reference Figure 1-2 A special construction surveying ruler for construction includes a shell 1, a reel 2 is rotatably connected inside the shell 1, a measuring ruler 3 is wound on the reel 2, a ruler outlet is provided on the shell 1, one end of the measuring ruler 3 is passed through the ruler outlet and a hook 4 is fixed thereto, a brake member 5 for controlling the reel 2 to reset and rotate and a stop member 6 for abutting the measuring ruler 3 are provided inside the shell 1, wherein the brake member 5 is a coil spring sleeved on both ends of the reel 2, one end of the coil spring is fixedly connected to the reel 2, and the other end of the coil spring is fixedly connected to the inner wall of the shell 1, the stop member 6 is rotatably connected to the shell 1, a notch is provided on the shell 1 for the stop member 6 to slide, after the stop member 6 is pushed downward in the notch, the bottom end of the stop member 6 abuts against the measuring ruler 3, thereby locking the length of the measuring ruler 3 after being pulled out.

[0040] Reference Figure 1-10, both sides of the housing 1 are provided with a reinforcement mechanism, which is used to support the pulled-out part of the measuring ruler 3. The reinforcement mechanism includes two groups of side housings 11, which are symmetrically fixed on both sides of the housing 1, and a housing cover 16 is fixedly installed on the top of each group of side housings 11. A first shaft rod 12 is rotatably connected to each group of side housings 11 through a bearing, and the first shaft rod 12 is rotatably connected to the inner wall of the housing cover 16 through a bearing. A winding disk 14 is fixed on each group of first shaft rods 12, and a torsion spring 13 for resetting is also provided outside each group of first shaft rods 12, wherein the torsion spring 13 is wound around the first shaft rod 12, and the two ends of the torsion spring 13 are respectively welded to the inner wall of the housing cover 16 and the outer wall of the winding disk 14 The torsion spring 13 has elastic potential energy, which can store energy when twisted and convert it into rotational motion of the turntable when released, reducing dependence on external energy. A steel belt 15 is horizontally wound on each set of winding disks 14, wherein one end of the steel belt 15 is fixed to the winding disk 14, and the other end of the steel belt 15 is passed through the outside of the side shell 11 and fixed to the hook 4. The part of the other end of the steel belt 15 close to the measuring scale 3 can abut against the edges of both sides of the pulled-out part of the measuring scale 3, and the remaining part of the steel belt 15 is horizontally wound on the winding disk 14, and the winding disk 14 is an elliptical design. The elliptical design can make more effective use of space, making the steel belt 15 more compact when wound.

[0041] A guide mechanism for controlling the steel belt 15 to abut against the edges of both sides of the measuring ruler 3 is arranged outside the shell 1. The guide mechanism includes a front shell 21 fixed outside the shell 1 and a cover plate 22 clamped on the top of the front shell 21. A channel 23 for the measuring ruler 3 to pass through and a track 24 for guiding the steel belt 15 are opened in the front shell 21. The channel 23 is opened in the central part of the front shell 21, and the tracks 24 are symmetrically opened on both sides of the front shell 21. The two symmetrically opened tracks 24 and the channel 23 are connected, wherein the ends of the tracks 24 and the channel 23 close to the shell 1 are the inlet ends of the steel belt 15 and the measuring ruler 3 respectively, and the tracks 24 are opened at the entrances of the steel belt 15 and the measuring ruler 3 respectively. 4 and the end of the channel 23 away from the housing 1 are the outlet ends of the steel belt 15 and the measuring ruler 3 respectively. After the other end of the steel belt 15 is passed through the outside of the side housing 11, the steel belt 15 enters the track 24 through the inlet end of the track 24, and passes through the outlet end of the track 24 under the guidance of the track 24. After the measuring ruler 3 is passed through the outlet, it enters the channel 23 through the inlet end of the channel 23 and passes through the outlet end of the channel 23. Since the track 24 and the channel 23 are interconnected, when the other end of the steel belt 15 is pulled to move to the outlet end of the track 24, the pulled-out part of the steel belt 15 can be pulled with the measuring ruler 3. The two side edges of the outgoing part abut against each other to provide support for the pulled-out part of the measuring ruler 3. The outlet end and the inlet end of each set of tracks 24 are rotatably connected to the first guide wheel 25 through the first rotating rod 26. The first rotating rod 26 is fixed on the first guide wheel 25 and is rotatably connected in the track 24 through a bearing. The corners in each set of tracks 24 are rotatably connected to multiple sets of second guide wheels 27 through the second rotating rod 28. The second rotating rod 28 is fixed on the second guide wheel 27 and is also rotatably connected in the track 24 through a bearing. The second guide wheels 27 set at each corner can be three groups, so that the force is more uniform. Each group of second The guide wheel 27 and the first guide wheel 25 are respectively in contact with the side of the portion of the steel belt 15 located in the track 24 away from the measuring ruler 3. The first guide wheel 25 and the second guide wheel 27 cooperate with the steel belt 15. The rolling friction between the first guide wheel 25, the second guide wheel 27 and the steel belt 15 is relatively small, which can more effectively reduce energy loss than sliding friction, making the movement of the steel belt 15 smoother. In addition, the first guide wheel 25 and the second guide wheel 27 can evenly distribute the pressure on the steel belt 15 to avoid excessive local pressure on the steel belt 15 during the guiding process, thereby reducing wear and damage to the steel belt 15.

[0042] Reference Figure 5-6Two reinforcing ribs 151 are embedded on one side of the steel belt 15 close to the measuring ruler 3. The two reinforcing ribs 151 are respectively located at the upper and lower positions of the edges of both sides of the measuring ruler 3. The reinforcing ribs 151 can be spring steel bars. The spring steel bars can produce large elastic deformation under the action of external force, and can quickly return to their original state when the external force is removed. Therefore, the reinforcing ribs 151 are arranged on the inner wall of the steel belt 15, which can further provide support for both sides of the measuring ruler 3, and can be more stably fixed at the measuring position to reduce shaking and deviation.

[0043] The present application can achieve that, through the cooperation between the above structures, when the measuring ruler 3 is pulled out for use, the hook 4 can pull the steel belt 15 out at the same time, and as the measuring ruler 3 and the steel belt 15 are continuously extended, the steel belt 15 moves in the track 24, and under the guidance of the first guide wheel 25 and the second guide wheel 27, the pulled-out part of the steel belt 15 can abut against the two side edges of the pulled-out part of the measuring ruler 3, and be pulled out together with the measuring ruler 3 for use. Since the measuring ruler 3 has the potential to collapse downward after being pulled out for a long distance, and the winding mode of the steel belt 15 is arranged horizontally, when the measuring ruler 3 is about to collapse downward, the steel belt 15 can provide additional resistance, improve the stability of the measuring ruler 3, and prevent instability when subjected to vertical loads. Therefore, the steel belt 15 can just provide support for the two side edges of the measuring ruler 3, thereby reducing the deformation of the measuring ruler 3, so that the measuring ruler 3 remains in a straight state, thereby ensuring the measurement accuracy.

[0044] The specific use principle is: when the hook 4 is pulled to pull the measuring ruler 3 out for use, the reel 2 rotates first and controls the brake member 5 to twist. At this time, the hook 4 simultaneously pulls the steel belt 15 outward. While the steel belt 15 moves, the first shaft 12 and the winding disk 14 are controlled to rotate, so that the torsion spring 13 is twisted. Thereafter, as the measuring ruler 3 is continuously extended outward, the steel belt 15 can continuously move outward through the rolling friction between the first guide wheel 25 and the second guide wheel 27, and under the guidance of the track 24, and is close to the two side edges of the measuring ruler 3 at the exit end of the track 24, and is pulled out together with the measuring ruler 3 to provide support for the measuring ruler 3. When the measurement is completed, since the brake member 5 and the torsion spring 13 both have elastic potential energy, when the measuring ruler 3 is recovered and wound under the reverse rotation of the reel 2, the steel belt 15 can also enter the side shell 11 through the track 24 again under the reverse rotation of the first shaft 12, and be wound around the outside of the winding disk 14 for storage.

[0045] Reference Figure 7-14A supporting mechanism is provided at the outlet end of the channel 23, and the supporting mechanism includes a bracket 31 arranged at the outlet end of the channel 23, a slider 311 is symmetrically fixed to the bottom of the bracket 31, and a slide groove is provided on the inner wall of the channel 23 for the slider 311 to limit the sliding movement. The slider 311 and the slide groove can limit the bracket 31 to prevent the bracket 31 from leaving the channel 23.

[0046] Among them, reciprocating components are arranged on both sides of the bracket 31, and the reciprocating components include L-shaped connecting rods 32 fixed on both sides of the bracket 31, and a rack plate 33 is fixed on one end of the L-shaped connecting rod 32 away from the bracket 31. Both sides of the front shell 21 are provided with movable grooves 34 for the L-shaped connecting rod 32 and the rack plate 33 to move. Among them, the bottoms of the two groups of first rotating rods 26 located at the exit end of the track 24 are fixed with first gears 35, and the sides away from the two groups of first gears 35 are meshed with second gears 36. The second gear 36 is rotatably connected in the movable groove 34 through a rotating shaft 37. The two groups of second gears 36 are respectively meshed with the corresponding rack plates 33. When the steel belt 1 After being pulled out, the contact between the steel belt 15 and the first guide wheel 25 can make the first guide wheel 25 and the first rotating rod 26 rotate together. Therefore, when the first rotating rod 26 rotates, the first gear 35 can be controlled to rotate, so that the rack plate 33 drives the L-shaped connecting rod 32 and the bracket 31 to move outward, so that the bracket 31 can support the bottom of the measuring ruler 3. By supporting the starting point of the pulled-out part of the measuring ruler 3, the measuring ruler 3 can be prevented from sagging from the starting point to a certain extent, and the linearity of the measuring tape can be maintained. In addition, the bracket 31 can limit the distance between the measuring ruler 3 and the steel belt 15, so that the steel belt 15 can be closely contacted with the two side edges of the measuring ruler 3.

[0047] Reference Fig.13 , buffers are provided on both sides of each group of rack plates 33, and the buffers include buffer tooth blocks 331 symmetrically arranged on both sides of the rack plates 33, the buffer tooth blocks 331 are meshed with the second gear 36, a connecting block 332 is fixed to the top of the buffer tooth block 331, a fixing seat 333 is symmetrically fixed to the top of the rack plate 33, a fixing rod 334 is fixed on the fixing seat 333, the connecting block 332 is movably sleeved outside the fixing rod 334, and a stopper is also fixed on the end of the fixing rod 334 away from the fixing seat 333, the stopper is used to limit the connecting block 332, and a spring 335 is also wound around the fixing rod 334, and the two ends of the spring 335 are respectively welded between the connecting block 332 and the fixing seat 333. The above-mentioned buffer can limit the movement range of the rack plate 33 to prevent the bracket 31 from moving beyond the design limit.

[0048] The specific operating principle is as follows: when the steel belt 15 is pulled out, the contact between the steel belt 15 and the first guide wheel 25 causes the first guide wheel 25 and the first rotating rod 26 to rotate. At this time, the first rotating rod 26 rotates to control the rotation of the first gear 35. Through the meshing between the first gear 35 and the second gear 36, the second gear 36 rotates and controls the rack plate 33 to move. At this time, the rack plate 33 drives the L-shaped connecting rod 32 and the bracket 31 as a whole to start moving away from the end of the housing 1, so that the bracket 31 moves to the bottom of the starting point of the pulled-out part of the measuring ruler 3, and the bracket 31 limits the distance between the measuring ruler 3 and the steel belt 15.

[0049] When the bracket 31 moves to the outside of the channel 23 or moves to the inside of the channel 23, the sliding groove is used as the moving range. When the slider 311 moves to one end or the other end of the sliding groove, the second gear 36 can contact the buffer tooth block 331, and under the elastic control of the spring 335, the buffer tooth block 331 reciprocates and extends, thereby playing the role of buffering and limiting the rack plate 33, limiting the moving range of the rack plate 33.

[0050] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A construction surveying ruler for building, comprising a housing (1), a reel (2) rotatably connected to the housing (1), and a measuring ruler (3) wound on the reel (2), the housing (1) being provided with a ruler outlet, one end of the measuring ruler (3) being passed through the ruler outlet and being fixed with a hook (4), a brake member (5) for controlling the reel (2) to return to rotation and a stop member (6) for abutting against the measuring ruler (3) being provided in the housing (1), characterized in that: Reinforcement mechanisms for supporting the extended portion of the measuring ruler (3) are provided on both sides of the housing (1), the reinforcement mechanisms comprising side housings (11) symmetrically fixed on both sides of the housing (1), each set of the side housings (11) being rotatably connected to a first shaft (12), each set of the first shaft (12) being provided with a torsion spring (13) for resetting, each set of the first shaft (12) being fixed with a winding reel (14), each set of the winding reel (14) being transversely wound with a steel belt (15), wherein one end of the steel belt (15) is fixed to the winding reel (14), and the steel belt (15) is provided with a torsion spring (13) for resetting. ) is passed through the side shell (11) and fixed to the hook (4); the other end of the steel belt (15) is abutted against the two side edges of the pulled-out portion of the measuring ruler (3); a guide mechanism for controlling the steel belt (15) to abut against the two side edges of the measuring ruler (3) is provided outside the shell (1); the guide mechanism comprises a front shell (21) fixed outside the shell (1) and a cover plate (22) provided on the top of the front shell (21); a channel (23) for the measuring ruler (3) to pass through and a track (24) for guiding the steel belt (15) are provided inside the front shell (21); The tracks (24) are symmetrically arranged on both sides of the front shell (21), and the two symmetrically arranged tracks (24) and the channel (23) are interconnected, wherein the ends of the tracks (24) and the channel (23) close to the shell (1) are inlet ends of the steel belt (15) and the measuring ruler (3), respectively, and the ends of the tracks (24) and the channel (23) away from the shell (1) are outlet ends of the steel belt (15) and the measuring ruler (3), respectively. The outlet end and the inlet end of each set of the tracks (24) are rotatably connected to a first guide wheel (25) via a first rotating rod (26), and the corners of each set of the tracks (24) are rotatably connected to a plurality of sets of second guide wheels (27) via a second rotating rod (28), and each set of the second guide wheels (27) and the first guide wheels (25) are respectively in contact with a side of the steel belt (15) away from the measuring ruler (3); A support mechanism is provided at the outlet end of the channel (23), the support mechanism comprising a bracket (31) provided at the outlet end of the channel (23) and a reciprocating assembly provided on both sides of the bracket (31), the reciprocating assembly comprising an L-shaped connecting rod (32) fixed on both sides of the bracket (31), a rack plate (33) being fixed on one end of the L-shaped connecting rod (32) away from the bracket (31), and a slot for the L-shaped connecting rod (32) and the rack plate (33) to move. A movable groove (34) is provided, wherein the bottom of the two groups of first rotating rods (26) located at the exit end of the track (24) are fixed with a first gear (35), the two groups of first gears (35) are meshed with a second gear (36) on the side away from each other, the second gear (36) is rotatably connected in the movable groove (34) via a rotating shaft (37), the two groups of the second gears (36) are respectively meshed with the corresponding rack plates (33), and buffer members are provided on both sides of each group of the rack plates (33); The buffer component comprises buffer tooth blocks (331) symmetrically arranged on both sides of the rack plate (33); a connecting block (332) is fixed on the top of the buffer tooth block (331); a fixing seat (333) is symmetrically fixed on the top of the rack plate (33); a fixing rod (334) is fixed on the fixing seat (333); the connecting block (332) is movably sleeved outside the fixing rod (334); a spring (335) is further wound outside the fixing rod (334); and two ends of the spring (335) are respectively welded between the connecting block (332) and the fixing seat (333).

2. The construction surveying ruler for construction according to claim 1 is characterized by: A shell cover (16) is provided on the top of the side shell (11), and two ends of the torsion spring (13) are respectively welded between the inner wall of the shell cover (16) and the outer wall of the winding drum (14), and the torsion spring (13) is wound around the first shaft (12).

3. The construction surveying ruler for construction according to claim 1 is characterized in that: Two reinforcing ribs (151) are embedded in a side of the steel belt (15) close to the measuring ruler (3), and the two reinforcing ribs (151) are respectively located at upper and lower positions of two side edges of the measuring ruler (3).

4. The construction-specific surveying ruler according to claim 3 is characterized in that: The reinforcing ribs (151) are spring steel bars.

5. The construction surveying ruler for construction according to claim 1 is characterized by: The winding disc (14) is of oval design.

6. The construction surveying ruler for construction according to claim 1 is characterized by: A stopper is also fixed to one end of the fixing rod (334) away from the fixing seat (333).

7. The construction-specific surveying ruler according to claim 1 is characterized in that: Slide blocks (311) are symmetrically fixed to the bottom of the bracket (31), and a sliding groove for limiting the sliding of the slide blocks (311) is provided on the inner wall of the channel (23).

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