A tape clamp for cranes

Abstract

The utility model provides a tape clamp special for crane, including clamp mainboard, track clamping structure and tape fixed structure. Track clamping structure is composed of fixed clamping plate, movable clamping block and clamping block clamping part, is used for clamping crane track, tape fixed structure includes the pressing plate and locking bolt assembly, forms the clamping groove to fix the tape scale initial end. The clamp replaces manual holding through mechanical clamping, effectively avoids the deviation caused by hand shake, fatigue during the measurement, improves the measurement precision and stability, and is suitable for high-precision measurement of the distance between crane tracks in industrial plants.

Description

Technical Field

[0001] This utility model relates to the field of crane installation technology, and more specifically, to a measuring tape clamp specifically for cranes. Background Technology

[0002] In industrial plants, logistics warehousing centers, and large production workshops, cranes are core equipment responsible for handling heavy objects and transferring production materials. The accuracy of their rail installation directly determines the safety, stability, and service life of the crane. Among these parameters, the spacing between adjacent crane rails is a critical installation parameter. If the spacing deviation exceeds the specified range, it can easily lead to excessive friction between the crane wheels and the rail sidewalls, causing operational jamming. In severe cases, it may even cause safety accidents such as rail deformation and crane derailment. Therefore, precise measurement is necessary to ensure that the spacing meets the design standards.

[0003] Currently, the industry commonly uses measuring tapes as the tool for measuring the distance between adjacent tracks. The typical operating procedure is as follows: at least one operator manually places the initial end of the measuring tape against the reference surface of one track and keeps it fixed; another person pulls the measuring tape to the opposite track, bringing it against the reference surface of that track before reading the value. However, this measurement method has significant drawbacks: firstly, when manually fixing the initial end of the measuring tape, the operator's hand is prone to shaking or uneven force, causing the initial end to deviate from the track reference surface, or the fixed position may shift due to arm fatigue during the measurement process, directly leading to measurement deviations; secondly, the initial end of the measuring tape lacks a stable fixing structure, and relying solely on manual holding makes it difficult to guarantee its contact with the track reference surface throughout the measurement process. Especially in environments with uneven workshop floors or interference, the fixing stability further decreases, resulting in poor consistency in measurement results, increasing the workload and construction costs of subsequent track adjustments, and making it difficult to meet the requirements of high-precision installation. Utility Model Content

[0004] The main technical problem this application addresses is the unstable fixation of the initial end of the handheld measuring tape on the track. To overcome the shortcomings of the prior art, this application provides a measuring tape clamp specifically for cranes.

[0005] This application provides a measuring tape clamp specifically for cranes, comprising: The clamping mainboard is used to provide support; The rail clamping structure includes a fixed clamping plate, a movable clamping block, and a clamping block clamping part. The fixed clamping plate is fixedly connected to the bottom of the main clamping plate. The movable clamping block is movably disposed on the main clamping plate and faces the fixed clamping plate. The clamping block clamping part pushes the movable clamping block to move toward the fixed clamping plate, so that the movable clamping block and the fixed clamping plate clamp the crane rail together. The measuring tape fixing structure includes a pressure plate and a locking bolt assembly. The pressure plate is detachably connected to the top of the clamping main board via the locking bolt assembly. A clamping groove is formed between the pressure plate and the clamping main board for clamping and fixing the initial end of the measuring tape scale.

[0006] This application presents a crane-specific tape measure clamp, which, compared to existing technologies, offers the following advantages: A track-clamping structure consisting of a fixed clamping plate, a movable clamping block, and a clamping block clamping part achieves a reliable connection between the clamp and the crane track, replacing manual hand-held fixing. This avoids clamp displacement caused by hand tremors, uneven force application, or arm fatigue, providing a stable installation foundation for measurement. The tape measure fixing structure, composed of a pressure plate and locking bolt assembly, firmly clamps the initial end of the tape measure's scale within the clamping groove, preventing the tape measure from deviating from the track reference surface during manual handling, ensuring the consistency of the measurement reference, and reducing measurement deviations from the source. Furthermore, the tape measure fixing structure is a detachable connection, facilitating quick installation or replacement of different types of tape measures. The track-clamping structure allows for adjustment of the clamping distance via the clamping block clamping part, adapting to crane tracks of different sizes and improving the clamp's versatility. Thus, the above solution solves the problem of unstable fixing of the initial end of the tape measure's scale on the track.

[0007] In one possible implementation, the fixed clamping plate has a first clamping surface on the side facing the movable clamping block, and the movable clamping block has a second clamping surface on the side facing the fixed clamping plate. The first and second clamping surfaces are spaced apart from each other, and both surfaces are planes adapted to the outer wall of the crane rail. Compared with the prior art, the first and second clamping surfaces are designed as planes adapted to the outer wall of the crane rail, which significantly increases the contact area between the clamping plate and the rail, avoiding "point contact" or "line contact" caused by mismatch of clamping surfaces, preventing the clamp from sliding relative to the rail during measurement, and further consolidating the installation stability of the clamp. The plane-fitting clamping method can disperse the clamping force, avoiding excessive local pressure that could damage the outer wall of the rail; at the same time, it ensures precise fit between the clamp and the rail reference surface, indirectly ensuring the alignment accuracy of the initial end of the measuring tape with the rail reference surface, and reducing measurement errors caused by clamping surface offset.

[0008] In one possible implementation, the clamping part of the clamping block includes a screw and a rotating screw head. The main clamping plate has a threaded through hole matching the screw. The screw is threaded into the threaded through hole. One end of the screw is fixed to the rotating screw head, and the other end of the screw is fixed to the movable clamping block. By rotating the rotating screw head, the screw is driven to move axially along the threaded through hole, thereby pushing the movable clamping block toward or away from the fixed clamping plate. Compared with the prior art, through the threaded transmission structure of the screw and the threaded through hole, rotating the screw head can drive the screw to move axially, thereby precisely controlling the movement distance of the movable clamping block, realizing stable adjustment of the clamping force, and avoiding loosening of the movable clamping block due to insufficient clamping force, or damage to the track due to excessive clamping force. The threaded transmission structure is simple to operate, requiring no complicated tools. The clamping and releasing actions can be completed simply by manually rotating the screw head. Moreover, the distance between the movable clamping block and the fixed clamping plate can be flexibly adjusted according to the track size, adapting to different specifications of crane tracks and expanding the applicability of the clamp. The threaded connection has self-locking properties, and the screw is not easy to loosen on its own after clamping, ensuring that the movable clamping block maintains a stable clamping state throughout the measurement process and avoiding clamping failure due to external interference such as vibration and collision.

[0009] In one possible implementation, the fixed clamping plate has a barb on the side away from the main clamping plate, which is used to hook onto the crane rail. Compared with the prior art, the hook and rail engagement, based on the horizontal clamping of the "movable clamping block and fixed clamping plate," adds a vertical hooking force, forming a dual fixing structure of "clamping and hooking." This prevents the clamp from falling off the rail during measurement due to gravity, accidental collisions, or vibrations, thus improving installation safety. For industrial plants, workshops, and other environments where uneven ground or equipment vibration may occur, the barb further enhances the connection strength between the clamp and the rail, ensuring stable fixation of the clamp even in complex environments. This avoids measurement interruptions or re-measurements due to clamp detachment, improving measurement efficiency.

[0010] In one possible implementation, the locking bolt assembly includes a screw head, a bolt shank, and a nut. The screw head is fixed to one end of the bolt shank. The pressure plate has a first through hole for the bolt shank to pass through, and the main clamp plate has a second through hole for the bolt shank to pass through. The other end of the bolt shank passes through the first and second through holes in sequence and is threadedly connected to the nut, so that the pressure plate and the main clamp plate are pressed between the screw head and the nut. Compared with the prior art, after the bolt shank passes through the first through hole of the pressure plate and the second through hole of the main clamp plate, the screw thread engagement between the nut and the bolt shank can tightly press the pressure plate and the main plate together, so that the initial end of the tape measure scale is firmly clamped in the clamping groove, preventing the tape measure from shifting due to tension during pulling and ensuring that the measurement reference does not deviate. The detachable structure with threaded connection facilitates quick installation and removal of the tape measure, and the clamping force can be adjusted by tightening the nut, which can ensure the fixing effect without damaging the tape measure scale surface due to excessive clamping. The locking bolt assembly has a standardized structure, and the parts are easy to purchase and replace. If the assembly is worn, the parts can be replaced individually, reducing the maintenance cost of the fixture.

[0011] In one possible implementation, the locking bolt assembly comprises two sets. The main clamp plate has two second through holes matching two bolt rods. The pressure plate has a first through hole matching one bolt rod and a groove matching the other bolt rod. The groove opening allows the bolt rod to disengage. When both sets of locking bolt assemblies are unlocked, the pressure plate can rotate around one bolt rod, and the other bolt rod exits from the groove, opening the clamping slot. Compared with the prior art, it eliminates the need to completely disassemble both sets of locking bolts. After only unlocking the nut, the pressure plate can rotate around one bolt rod, and the other bolt rod exits from the groove, quickly opening the clamping slot and significantly shortening the loading and unloading time of the measuring tape. This is especially suitable for continuous measurement scenarios. The pressure plate is always connected to the main clamp plate via one bolt rod and will not completely detach from the main clamp plate, effectively preventing the pressure plate from falling or being lost during operation, reducing the difficulty of parts management, and improving the convenience of on-site operation. The groove design allows the other bolt rod to freely enter and exit while the pressure plate rotates around the bolt rod, reducing the skill requirements for the operator.

[0012] In one possible implementation, the top of the main clamp plate is provided with a scale alignment plate for aligning the "0" mark of the measuring tape. The scale alignment plate is vertically aligned with the fixed clamping plate. Compared to existing technologies, the scale alignment plate provides a clear alignment reference for the "0" mark of the measuring tape, replacing manual visual alignment and avoiding measurement errors caused by human judgment deviations, thus improving measurement accuracy from the source. The vertical alignment of the scale alignment plate with the fixed clamping plate means that after the "0" mark of the measuring tape is aligned by the alignment plate, the track reference surface that it contacts with the fixed clamping plate is completely consistent in the vertical direction, avoiding measurement deviations caused by vertical misalignment between the "0" mark and the track reference surface, further ensuring the accuracy of the measurement data.

[0013] In one possible implementation, the main clamp plate is made of steel plate, and the pressure plate is made of wood. Compared with the prior art, the main clamp plate made of steel plate has the characteristics of high strength and high rigidity, and can withstand the clamping force of the clamping part and external forces, avoiding deformation or breakage of the main clamp, extending the service life of the clamp, and meeting the long-term use needs of industrial scenarios. The pressure plate is made of wood plate, which is soft and has a certain friction, so it will not scratch the scale surface of the measuring tape or damage the measuring tape body when in contact with the measuring tape; at the same time, the friction of the wood plate can enhance the clamping effect on the measuring tape, preventing the measuring tape from slipping in the clamping groove, thus taking into account both "tool protection" and "fixing effect".

[0014] In one possible implementation, a rubber pad is provided at the bottom of the pressure plate. Compared with the prior art, the rubber pad has a higher coefficient of friction, which can significantly increase the friction between the pressure plate and the measuring tape, preventing the measuring tape from slipping in the clamping groove due to tension or slight vibration, ensuring that the initial position of the measuring tape's scale is fixed, and further reducing measurement deviation. The rubber material is elastic, which can buffer the clamping force of the pressure plate on the measuring tape, avoiding measuring tape indentations, scale wear, or body deformation caused by hard contact, providing good protection for the measuring tape and extending the service life of the measuring tool. The elasticity of the rubber pad can adapt to measuring tapes of different thicknesses, ensuring that a tight clamping state is always maintained in the clamping groove. Even if there are slight differences in the thickness of the measuring tape, stable fixation can still be achieved through the deformation of the rubber, improving the adaptability of the clamp to measuring tapes of different specifications. Attached Figure Description

[0015] Figure 1 This is the front view of this application; Figure 2 This is a top view of this application; Figure 3 This is a side view of this application; Figure 4 Partial cross-section of this application Figure 1 ; Figure 5 Partial cross-section of this application Figure 2 ; Explanation of reference numerals in the attached figures: 1. Fixture main board; 11. Threaded through hole; 12. Second through hole; 2. Track clamping structure; 21. Fixed clamping plate; 211. Barb; 22. Movable clamping block; 23. Clamping part of clamping block; 231. Screw; 232. Rotating screw head; 3. Measuring tape fixing structure; 31. Pressure plate; 311. First through hole; 312. Groove; 32. Locking bolt assembly; 321. Tightening screw head; 322. Bolt rod; 323. Nut; 4. Scale alignment plate; 5. Rubber pad. Detailed Implementation

[0016] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0017] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0018] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0019] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] See Figures 1 to 5 This application discloses a measuring tape clamp for cranes, including a clamp main board 1, a rail clamping structure 2, and a measuring tape fixing structure 3.

[0021] The main board 1 of the fixture serves as the basic platform and supporting body of the entire fixture. It is usually made of a metal steel plate with a certain thickness, strength and rigidity to ensure that the fixture is stable and does not deform during clamping and measurement.

[0022] The track clamping structure 2 is responsible for firmly clamping the fixture onto the crane track. It includes a fixed clamping plate 21, a movable clamping block 22, and a clamping block clamping part 23. The fixed clamping plate 21 is a metal steel plate, which is vertically fixed to the bottom surface of one end of the main clamping plate 1 by welding. The movable clamping block 22 is also a metal steel block, which is movably mounted on the main clamping plate 1, with its clamping surface facing the clamping surface of the fixed clamping plate 21. The clamping part 23 acts on the movable clamping block 22, causing it to clamp or release the side wall of the crane rail together with the fixed clamping plate 21. There are two clamping parts 23 to improve the clamping reliability. During operation, the clamping part 23 is driven by external force to push the movable clamping block 22 towards the fixed clamping plate 21 until it clamps the crane rail together with the fixed clamping plate 21. The clamping force is adjustable to avoid the clamp shifting due to being too loose or damaging the rail due to being too tight. When releasing, the clamping part 23 is driven to move the movable clamping block 22 away from the fixed clamping plate 21, which facilitates the disassembly of the clamp or the change of the clamping position.

[0023] The measuring tape fixing structure 3 is used to quickly and reliably clamp the initial end of the measuring tape's scale. It includes a pressure plate 31 and a locking bolt assembly 32. The pressure plate 31 is a long strip of wood, the length of which is adapted to the width of the main clamping plate 1. The pressure plate 31 is detachably connected to the top of the main clamping plate 1 via the locking bolt assembly 32, forming a clamping groove between the pressure plate 31 and the main clamping plate after connection. The inner wall of the clamping groove must be kept flat to avoid scratching the measuring tape; after clamping, it must be ensured that the initial end of the measuring tape's scale is aligned with the track reference surface to solve the measurement deviation problem caused by offset and hand tremors when manually fixing the measuring tape.

[0024] In this embodiment, the side of the fixed clamping plate 21 facing the movable clamping block 22 is machined into a flat first clamping surface; similarly, the side of the movable clamping block 22 facing the fixed clamping plate 21 is machined into a flat second clamping surface. These two clamping surfaces are parallel and opposite to each other, and the gap between them is used to accommodate the crane rail. Both the first and second clamping surfaces are planar, which is compatible with the typically straight outer wall shape of the crane rail, thereby increasing the contact area, improving the stability and reliability of the clamping, and avoiding point contact damage to the rail.

[0025] In this embodiment, the clamping part 23 includes a screw 231 and a rotating screw head 232. A threaded through hole 11 is machined on the main clamping plate 1, corresponding to the position of the movable clamping block 22. The screw 231 and the threaded through hole 11 form a threaded pair. One end of the screw 231 is fixedly connected to the rotating screw head 232, and the other end is fixedly connected to the movable clamping block 22. During operation, the user rotates the rotating screw head 232, using the thread transmission principle to drive the screw 231 to move axially, thereby directly pushing or pulling the movable clamping block 22 towards or away from the fixed clamping plate 21, achieving the clamping and releasing functions. The threaded drive structure has self-locking properties; after tightening, it can maintain the clamping state without continuous force, solving the problem of clamping loosening caused by arm fatigue during manual fixing. Simultaneously, it has high adjustment precision, allowing precise control of the position of the movable clamping block 22 according to the track width, adapting to different specifications of crane tracks.

[0026] In this embodiment, a barb 211, bent towards the web of the rail, is provided at the lower edge of the fixed clamping plate 21 away from the main clamping plate 1. The barb 211 is integrally bent from the end of the fixed clamping plate 21 away from the main clamping plate 1, and is positioned towards the movable clamping block 22. When clamping the rail, this barb 211 can hook onto the lower edge or web of the crane rail. In this way, even if the clamping part 23 of the clamping block becomes slightly loose, the barb 211 can provide additional safety protection to prevent the entire clamp from accidentally falling off the rail.

[0027] In this embodiment, the locking bolt assembly 32 includes a screw head 321, a bolt shank 322, and a nut 323. The screw head 321 is fixed to one end of the bolt shank 322. A first through hole 311 larger than the diameter of the bolt shank 322 is opened on the pressure plate 31, and a second through hole 12 is opened at the corresponding position on the main clamping plate 1. Clamping process: The end of the bolt shank 322 away from the screw head 321 is passed through the first through hole 311 of the pressure plate 31 and the second through hole 12 of the main clamping plate 1 in sequence. The nut 323 is screwed on the other end of the bolt shank 322 that extends out of the main clamping plate. In the initial state, the nut 323 is not tightened, the pressure plate 31 can move up and down, and the clamping groove is open. After the initial end of the tape measure is placed into the clamping groove, the screw head 321 is rotated clockwise to make the screw head 321 and the nut 323 gradually approach each other, pressing the pressure plate 31 and the main clamping plate 1 between them until the clamping groove clamps the tape measure. At this time, the tape measure does not slide relative to each other. Unlocking process: Rotate the screw head 321 counterclockwise to increase the distance between the screw head 321 and the nut 323, release the pressure of the pressure plate 31, open the clamping groove, and then take out the measuring tape; there is no need to completely disassemble the nut 323, the operation is convenient, and the measuring tape can be quickly replaced or the initial end position adjusted.

[0028] In this embodiment, the locking bolt assembly 32 is configured in two sets, spaced apart along the length of the pressure plate 31 to provide uniform clamping force. Correspondingly, the main clamping plate 1 has two second through holes 12 machined on it; the pressure plate 31 has one first through hole 311 and a groove 312, such as a U-shaped groove, machined on it. One bolt rod 322 passes through the fixed first through hole 311, while the other bolt rod 322 can be inserted or removed from the groove 312. When it is necessary to place or remove the measuring tape, the two sets of locking bolt assemblies 32 are unlocked (i.e., the nut 323 is loosened or the screw head 321 is tightened); at this time, the pressure plate 31 can rotate around the bolt rod 322 passing through the first through hole 311 as an axis; simultaneously, the other bolt rod 322 exits from the groove 312, fully opening the clamping groove, making the operation very convenient and quick.

[0029] In this embodiment, a scale alignment plate 4 is vertically fixed to the top surface of the main clamp 1, near the pressure plate 31. The scale alignment plate 4 is vertically aligned with the reference surface of the fixed clamp 21 below. In use, the "0" mark of the measuring tape is placed tightly against the scale alignment plate 4 to ensure that the measurement reference is consistent with the track clamping reference, eliminating measurement errors caused by deviations in the placement of the measuring tape and improving measurement accuracy.

[0030] In this embodiment, a rubber pad 5 is provided at the bottom of the pressure plate 31. This rubber pad 5 increases the friction between the pressure plate and the measuring tape, making the clamping more secure and preventing the measuring tape from slipping. At the same time, the soft rubber pad 5 can better protect the surface of the measuring tape, preventing it from being scratched or marked by the pressure plate 31.

[0031] This embodiment describes a measuring tape clamp specifically designed for cranes. During operation, the hook 211 of the fixed clamping plate 21 is first hooked onto the crane rail. The rotating screw head 232 of the clamping block clamping part 23 is rotated, and the movable clamping block 22 is pushed towards the fixed clamping plate 21 via the transmission between the screw 231 and the threaded through hole 11 of the clamping main plate 1. The rail is then clamped by the planar clamping surfaces of the two fitting the outer wall of the rail. Next, two sets of locking bolts are unlocked, and the pressure plate 31 rotates around one of the bolts (the other bolt exits from the groove 312) to open the clamping slot. The initial end of the measuring tape is inserted, and the "0" position is aligned with the scale alignment plate 4. Finally, the bolts are tightened, allowing the pressure plate 31 and the clamping main plate 1 to clamp the initial end of the measuring tape, enabling the measuring tape to be pulled for measurement.

[0032] The beneficial effects of this application include: 1. The track clamping structure 2 (fixed clamping plate 21, movable clamping block 22 and clamping block clamping part 23) achieves a reliable connection with the crane track, replacing manual hand operation, avoiding measurement deviations caused by hand tremors and fatigue, and improving measurement stability.

[0033] II. The tape measure fixing structure 3 (pressure plate 31 and locking bolt assembly 32) can firmly clamp the initial end of the tape measure scale, ensuring alignment with the track reference surface and improving measurement accuracy.

[0034] Third, the clamping part 23 of the clamping block adopts the screw 231 for transmission, which is easy to operate, has strong self-locking ability, can adapt to different track sizes, and has strong versatility.

[0035] IV. The addition of a barb 211 structure and rubber pad 5 enhances the clamp's ability to prevent slippage and protects the measuring tape, making it suitable for complex industrial environments.

[0036] 5. The scale alignment plate 4 ensures accurate alignment of the "0" position, further reducing measurement errors and improving construction efficiency and safety.

[0037] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0038] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0039] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A measuring tape clamp specifically for cranes, characterized in that, include: The clamping main board is used to provide support; The rail clamping structure includes a fixed clamping plate, a movable clamping block, and a clamping block clamping part. The fixed clamping plate is fixedly connected to the bottom of the main clamping plate. The movable clamping block is movably disposed on the main clamping plate and faces the fixed clamping plate. The clamping block clamping part pushes the movable clamping block to move toward the fixed clamping plate, so that the movable clamping block and the fixed clamping plate clamp the crane rail together. The measuring tape fixing structure includes a pressure plate and a locking bolt assembly. The pressure plate is detachably connected to the top of the clamping main board via the locking bolt assembly. A clamping groove is formed between the pressure plate and the clamping main board for clamping and fixing the initial end of the measuring tape scale.

2. The crane-specific measuring tape clamp according to claim 1, characterized in that, The fixed clamping plate has a first clamping surface on the side facing the movable clamping block, and the movable clamping block has a second clamping surface on the side facing the fixed clamping plate. The first clamping surface and the second clamping surface are arranged at intervals relative to each other, and the first clamping surface and the second clamping surface are planes adapted to the outer wall of the crane rail.

3. The crane-specific measuring tape clamp according to claim 2, characterized in that, The clamping part of the clamping block includes a screw and a rotating screw head. The main plate of the clamp is provided with a threaded through hole that matches the screw. The screw is threadedly connected in the threaded through hole. One end of the screw is fixed to the rotating screw head, and the other end of the screw is fixed to the movable clamping block. By rotating the rotating screw head, the screw is driven to move axially along the threaded through hole, thereby pushing the movable clamping block to move toward or away from the fixed clamping plate.

4. The crane-specific measuring tape clamp according to claim 1, characterized in that, The fixed clamping plate is provided with a barb on the side away from the main clamping plate, and the barb is used to hook onto the crane rail.

5. The crane-specific measuring tape clamp according to claim 1, characterized in that, The locking bolt assembly includes a screw head, a bolt shank, and a nut. The screw head is fixed to one end of the bolt shank. The pressure plate has a first through hole for the bolt shank to pass through, and the main clamp plate has a second through hole for the bolt shank to pass through. The other end of the bolt shank passes through the first through hole and the second through hole in sequence and is threadedly connected to the nut, so that the pressure plate and the main clamp plate are pressed between the screw head and the nut.

6. The crane-specific measuring tape clamp according to claim 5, characterized in that, The locking bolt assembly consists of two sets. The main clamp plate has two second through holes that match the two bolt rods. The pressure plate has a first through hole that matches one of the bolt rods and a groove that matches the other bolt rod. The groove opening is used for the bolt rod to come out. When the two sets of locking bolt assemblies are unlocked, the pressure plate can rotate around one of the bolt rods, and the other bolt rod comes out of the groove, thus opening the clamping groove.

7. The crane-specific measuring tape clamp according to claim 1, characterized in that, The top of the main clamp is provided with a scale alignment plate for aligning the "0" mark of the measuring tape. The scale alignment plate is vertically aligned with the fixed clamp.

8. The crane-specific measuring tape clamp according to claim 1, characterized in that, The main body of the clamp is made of steel plate, and the pressure plate is made of wood.

9. The crane-specific measuring tape clamp according to claim 1, characterized in that, The bottom of the pressure plate is equipped with a rubber pad.

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