Small and medium-sized ship water gauge drawing tool

Abstract

A small and medium-sized ship water gauge can draw tool belongs to shipbuilding auxiliary device technical field. The tool includes vertical steel support, mobile sleeve which can slide up and down on the support, transmission mechanism, level base, automatic leveling laser level, scale and pointer. The transmission mechanism is composed of a crank, up and down sprocket device and chain, used to drive the mobile sleeve to lift; the level base is fixed on the top of the mobile sleeve, used to carry the automatic leveling laser level; the scale is hung on the base and naturally droops, the pointer is installed on the mobile sleeve and points to the scale reading surface; the locking device is also provided to fix the mobile sleeve at any height. When using, the cross laser line emitted by the laser level is aligned with the ship reference point and the rib mark line, and the scale reading is combined to accurately position the water gauge scale position. The utility model has the advantages of simple structure, convenient operation, can effectively adapt to the complex side line of small and medium-sized ship, significantly improves the water gauge can draw precision and construction efficiency, single person can complete the operation, has good engineering application value.

Description

Technical Field

[0001] This utility model belongs to the field of ship draft surveying fixtures, and specifically relates to a draft surveying fixture for small and medium-sized ships. Background Technology

[0002] In shipbuilding, accurate draft marking is a crucial step in ensuring safe navigation, proper loading, and trade settlement. Draft markings directly reflect a ship's draft and are used to calculate its actual deadweight; their accuracy is critical to ship operation.

[0003] Currently, the draft surveying of small and medium-sized vessels typically employs traditional methods: first, a level or laser theodolite is used to determine the baseline or reference point on the hull; then, auxiliary tools such as a measuring tape and level tube are used to measure and draw lines segment by segment upwards from the reference point. However, this method has significant limitations. On the one hand, the bow and stern hull lines of small and medium-sized inland waterway vessels are complex and exhibit significant non-vertical characteristics, making vertical measurements susceptible to interference from the hull's curved surfaces. On the other hand, traditional methods rely on multiple people operating the level tube and measuring tape, which is not only inefficient but also makes it difficult to guarantee the consistency and accuracy of the draft gauge graduations due to human reading errors and tool positioning deviations. Especially in dense drafting operations involving multiple ribs and waterlines, repeated instrument adjustments and calibration of the reference point further prolong the construction period.

[0004] Therefore, there is an urgent need for a special tooling that is structurally sound, easy to operate, and capable of automatically leveling and accurately projecting the water level gauge position, in order to overcome the shortcomings of existing technologies in terms of adaptability, precision and efficiency, and to meet the actual needs of efficient and high-quality construction of small and medium-sized ships. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a tooling for marking water level gauges on small and medium-sized ships. By improving the quantitative level of the laser emission device, it is easier for construction workers to mark accurate water level gauges on the hull plating more quickly, reduce marking errors, and improve construction efficiency.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A draft surveying fixture for small and medium-sized vessels includes a support, a movable sleeve, a transmission mechanism, a level base, an automatic leveling laser level, a scale, and a pointer. The movable sleeve moves up and down along the support; The transmission mechanism is connected to the movable sleeve and is used to drive its lifting and lowering; The level instrument base is fixed to the movable sleeve; The automatic leveling laser level is placed on the level base; The scale is suspended from the base of the level instrument; The pointer is mounted on the movable sleeve and points to the scale face of the ruler.

[0007] Preferably, the support is a vertically arranged steel support, and the movable sleeve is fitted onto the outside of the support and can slide along its height direction.

[0008] Preferably, the transmission mechanism includes a crank handle, an upper sprocket assembly, a lower sprocket assembly, and a chain; the upper sprocket assembly and the lower sprocket assembly are respectively fixed to the upper and lower parts of the support; the chain is wound between the upper sprocket assembly and the lower sprocket assembly and is fixedly connected to the movable sleeve; the crank handle is connected to the shaft end of the lower sprocket assembly.

[0009] Preferably, it further includes a locking device, which is disposed on the movable sleeve and is used to lock the movable sleeve at any height position of the support.

[0010] Preferably, the pointer includes a long bolt and a nut, the tip of the long bolt pointing to the scale face of the scale, and the nut being fixed to the movable sleeve.

[0011] Preferably, the scale is suspended from the level base after a hole is made at one end, hanging naturally with its scale surface facing the pointer.

[0012] Preferably, the level base is a horizontal platform fixed to the top of the movable sleeve.

[0013] Preferably, the sprocket of the upper sprocket assembly has teeth, and the sprocket of the lower sprocket assembly has 54 teeth.

[0014] Preferably, the automatic leveling laser level emits crosshair laser lines, with the horizontal laser used to align with the ship's reference point or rib marking line, and the vertical laser used to project the water gauge scale position onto the hull plating.

[0015] The present invention can achieve the following beneficial effects: 1. The water level surveying fixture provided by this utility model can be used to raise and rotate the laser level, so that the laser point always moves on the water level rib. A ruler can be used to draw water lines of various heights directly according to the position of the cross laser line of the laser level. It is suitable for the hull plates of small and medium-sized ships with different side line shapes, reduces the need for repeated leveling, simplifies the surveying process, effectively improves work efficiency, shortens the surveying time, and reduces the number of construction personnel to 1.

[0016] 2. The water level gauge surveying fixture provided by this utility model can be completed by only one construction worker, which reduces the need for repeated leveling of the water level gauge, simplifies the surveying process, effectively improves work efficiency, and shortens the surveying time.

[0017] 3. The application of this tooling provides a solution for the side drafting of complex hull shapes on small and medium-sized vessels, and provides a case study for drafting construction on other similar vessels. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is the front view of the present utility model; Figure 2 for Figure 1 AA-shaped diagram; Figure 3 for Figure 1 Middle BB side view; Figure 4 for Figure 1 C-plane diagram; Figure 5 This is an enlarged view of section D of the present invention; Figure 6 This is an enlarged view of section E of this utility model; Figure 7 This is a flowchart illustrating the usage of this utility model. Figure 1 ; Figure 8 This is a flowchart illustrating the usage of this utility model. Figure 2 ; Figure 9 This is a flowchart illustrating the usage of this utility model. Figure 3 .

[0019] In the diagram: 1-Steel support; 2-Handle; 3-Chain; 4-Upper gear assembly; 5-Locking device; 6-Pointer; 7-Steel tape measure; 8-Chain fixing bolt; 9-Moving sleeve; 10-Lower gear assembly; 11-Automatic leveling laser level; 12-Leveling instrument base; 13-Hull; 14-Shipbuilding scale; 15-Ship reference point; 16-Hull support. Upper sprocket assembly 4: 4-1 bearing; 4-2 shaft; 4-3 bearing housing; 4-4 sprocket (22 teeth). Lower sprocket assembly 10: 10-1 bearing; 10-2 shaft; 10-3 bearing housing; 10-4 sprocket (54 teeth). Detailed Implementation

[0020] Preferred solutions include Figures 1 to 9As shown, a draft surveying fixture for small and medium-sized vessels includes a steel support 1, a crank handle 2, a 081C chain 3, an upper sprocket assembly 4, a locking device 5, a pointer 6, a steel tape measure 7, a chain fixing bolt 8, a movable sleeve 9, a lower sprocket assembly 10, an automatic leveling laser level 11, and a level base 12. The nuts 5-2 of the locking device 5, 6-2 of the pointer 6, the chain fixing bolt 8, and the level base 12 are welded to the movable sleeve 9. The bearing seats 4-3 of the upper sprocket assembly 4 and 10-3 of the lower sprocket assembly 10 are welded to the steel support 1. The upper sprocket assembly 4 and the lower sprocket assembly 10 are connected by the 081C chain 3 and welded to the chain fixing bolt 8. The steel tape measure 7 is suspended from the level base 12 after being perforated at one end. The automatic leveling laser level 11 is placed on the level base 12.

[0021] The steel support 1 is a vertically installed rigid column, serving as the supporting framework for the entire tooling. An upper sprocket assembly 4 and a lower sprocket assembly 10 are fixedly installed at its upper and lower ends, respectively. The upper sprocket assembly 4 includes a 22-tooth sprocket 4-4, a shaft 4-2, a bearing 4-1, and a bearing seat 4-3 welded to the top of the support. The lower sprocket assembly 10 includes a 54-tooth sprocket 10-4, a shaft 10-2, a bearing 10-1, and a bearing seat 10-3 welded to the bottom of the support. The upper and lower sprockets are connected by a 081C type chain 3, forming a closed transmission circuit.

[0022] The movable sleeve 9 is a hollow cylindrical structure, fitted onto the outside of the steel support 1, and can slide smoothly along its height. The chain 3 is rigidly connected to the outer wall of the movable sleeve 9 via chain fixing bolts 8, so that when the crank 2 drives the lower sprocket device 10 to rotate, the chain 3 drives the movable sleeve 9 to achieve lifting and lowering movement. This transmission mechanism adopts a high reduction ratio design with 54 teeth on the lower sprocket and 22 teeth on the upper sprocket, ensuring smooth lifting and lowering process and high fine-tuning accuracy.

[0023] At the top of the movable sleeve 9, a horizontally arranged leveling instrument base 12 is welded and fixed. Its upper surface is a flat platform used to support the automatic leveling laser level 11. This level has a self-leveling function and can emit cross-shaped laser lines: the horizontal laser is used to align with the reference points or rib marking lines on the hull, while the vertical laser is projected vertically onto the outer plate of the hull to indicate the position of the current draft gauge mark.

[0024] The scale 7 is preferably a flexible steel tape measure, with a through hole at one end, and is suspended from the front end of the level base 12 by a hook or pin, allowing it to hang naturally under gravity, with the scale surface facing the movable sleeve 9. The pointer 6 consists of a long bolt 6-1 and a nut 6-2. The nut 6-2 is welded and fixed to the outer wall of the movable sleeve 9, and the long bolt 6-1 passes through the nut and its extension length is adjustable. Its tip precisely points to the reading surface of the scale 7, used to read the current vertical height of the laser level in real time.

[0025] In addition, a locking device 5 is provided on the side wall of the movable sleeve 9. Its structure can be a hand-tightening bolt or a quick clamp, which is used to firmly lock the movable sleeve 9 in any position of the steel support 1 after it is adjusted to the target height, so as to prevent the height deviation caused by vibration or external force and ensure the accuracy of the marking.

[0026] According to the process requirements for ship assembly, shipbuilding scales are generally set up and ship construction benchmarks are marked when sections are placed on the slipway. The vertical distance P between the baseline of the main hull and the benchmark is taken as follows: Figures 7-9 As shown, the process of marking the water level is as follows: First, place the laser level 11 on the side of the hull where the draft gauge needs to be drawn, and mark the vertical line of the draft gauge. Then, install the tooling according to... Figure 1 Assemble it and place it on the side of the hull that is suitable for rowing.

[0027] The second step is to crank handle 2 and rotate laser level 11 so that the laser is aligned with the ship reference point on the shipbuilding scale. Adjust the position of pointer 6 so that it is about to touch steel tape measure 7, and read the reading N1 on steel tape measure 7 at this time.

[0028] Third, rotate the laser level 11 so that its laser is aligned with the mark line of the water gauge rib. If the lowest water gauge graduation line to be marked is L... min Crank handle 2 to raise laser level 11, so that pointer 6 points to the reading N2=L on steel tape measure 7. min +A+P, mark the point where the laser on the hull intersects with the water gauge rib line.

[0029] Fourth step, crank handle 2 to raise laser level 11 and keep the laser on the marked line. Mark a point at the intersection of the laser line and the draft gauge line on the hull for every 2cm increase in the measuring tape reading. If the maximum draft gauge line is L... max Then the maximum reading of the measuring tape is N3 = L max +A+P.

[0030] Following the steps above, all water gauge markings at the rib position can be marked. It is also important to tighten the tightening device 5 before each reading.

[0031] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A draft surveying tool for small and medium-sized vessels, characterized in that, Includes support, movable sleeve (9), transmission mechanism, level base (12), automatic leveling laser level (11), scale and pointer (6); The movable sleeve (9) moves up and down along the support; The transmission mechanism is connected to the movable sleeve (9) and is used to drive its lifting and lowering; The level instrument base (12) is fixed on the movable sleeve (9); The automatic leveling laser level (11) is placed on the level base (12); The scale is suspended on the level instrument base (12); The pointer (6) is mounted on the movable sleeve (9) and points to the scale face of the ruler.

2. The water gauge marking fixture according to claim 1, characterized in that, The support is a vertically arranged steel support (1), and the movable sleeve (9) is fitted on the outside of the support and can slide along its height direction.

3. The water gauge marking fixture according to claim 1, characterized in that, The transmission mechanism includes a crank (2), an upper sprocket device (4), a lower sprocket device (10), and a chain (3); the upper sprocket device (4) and the lower sprocket device (10) are respectively fixed to the upper and lower parts of the support; the chain (3) is wound between the upper sprocket device (4) and the lower sprocket device (10) and is fixedly connected to the movable sleeve (9); the crank (2) is connected to the shaft end of the lower sprocket device (10).

4. The water gauge marking fixture according to claim 1, characterized in that, It also includes a locking device (5), which is provided on the movable sleeve (9) and is used to lock the movable sleeve (9) at any height position of the support.

5. The water gauge marking fixture according to claim 1, characterized in that, The pointer (6) includes a long bolt (6-1) and a nut (6-2), the tip of the long bolt (6-1) pointing to the scale face of the scale (7), and the nut (6-2) fixed to the movable sleeve (9).

6. The water gauge marking fixture according to claim 1, characterized in that, The scale (7) is suspended from the level base (12) after a hole is made at one end, hanging naturally with its scale surface facing the pointer (6).

7. The water gauge marking fixture according to claim 1, characterized in that, The level base (12) is a horizontal platform, fixed to the top of the movable sleeve (9).

8. The water gauge marking fixture according to claim 3, characterized in that, The upper sprocket device (4) has 22 teeth on its sprocket, and the lower sprocket device (10) has 54 teeth on its sprocket.

9. The water gauge marking fixture according to claim 1, characterized in that, The automatic leveling laser level (11) emits a cross laser line. Its horizontal laser is used to align with the ship's reference point or rib marking line, and its vertical laser is used to project the water gauge scale position onto the ship's outer plating.

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