A ship steel plate reverse marking projection device and its usage method

Abstract

The present invention relates to a reverse marking projection device for ship steel plates and a usage method, which includes a steel plate, a support rod, a sliding rod, a projection camera, and three positioning rods. The steps of the usage method include: taking one positioning point on each of the front and back sides at three positions in the center of the steel plate, for a total of six positioning points, and placing the bottom ends of the three positioning rods on the three positioning points on the back side of the steel plate respectively; fixing the sliding rod on the support rod through bolts, and taking a photo of the image on the back side of the steel plate through the projection camera; then turning the steel plate over, re-placing the three positioning rods on the positioning points, and after mirror processing the captured image by the projection camera, projecting the image onto the front side of the steel plate; assembling parts on the front side of the steel plate according to the projection marking positions. The present invention eliminates the reverse marking link of the steel plate, not only saving the excessive measurement links, but also this device can be used for steel plate marking with different plate thicknesses and different shapes.

Description

Technical Field

[0001] The present invention relates to the field of shipbuilding, and particularly to a projection device for reverse marking of ship steel plates and a usage method thereof. Background Art

[0002] In shipbuilding, plate cutting mainly uses numerical control cutting machines. When cutting steel plates, the cutting machine will pre-mark on the steel plate. However, considering the material utilization rate, during the design nesting stage, some plate parts will be nested with the reverse side up. As a result, the cutting machine will mark on the back of the steel plate. When on-site workers install components, they cannot rely on the markings on the back for calibration, leading to certain errors. In particular, the assembly work of steel plates with curved markings is more difficult, ultimately increasing the workload.

[0003] The comparative document CN114750124A discloses a device and a marking method for marking both sides of ship steel plates, which can complete synchronous marking on the front and back of the steel plate. The disadvantage is that a special device for marking both sides of ship steel plates must be used, and this device for marking both sides of ship steel plates may not be applicable because it is not compatible with the numerical control cutting machine. Summary of the Invention

[0004] To solve the technical problems existing in the prior art, the present invention provides a projection device for reverse marking of ship steel plates and a usage method thereof. By photographing the marked area on the back of the steel plate and projecting it onto the front of the steel plate, the problem of difficult construction for reverse marking of the steel plate is solved.

[0005] The technical solution of the present invention is as follows:

[0006] A projection device for reverse marking of ship steel plates includes a support rod and a projection camera. Positioning points are provided at the same positions on both the front and back of the steel plate. The support rod is placed on the positioning points, and the projection camera is installed above the support rod. The projection camera is used to photograph the image on the back of the steel plate and project the mirror-processed image onto the front of the steel plate.

[0007] As a preferred technical solution, a positioning rod is fixed below the support rod, and the positioning rods correspond to the positioning points one by one.

[0008] As a preferred technical solution, the number of positioning points on the same surface of the steel plate is three, and the number of positioning rods is also three.

[0009] As a preferred technical solution, the support rod includes an outer support rod and a sliding rod. A through hole is provided at the center of the cross-section of the outer support rod, and the sliding rod is arranged in the through hole.

[0010] As a preferred technical solution, a screw hole and a bolt are provided at the upper part of the outer support rod. The screw hole communicates with the through hole, and a thread matching the bolt is provided in the screw hole. The bolt passes through the screw hole and abuts against the sliding rod to fix the sliding rod.

[0011] As a preferred technical solution, the sliding rod can be adjusted in height and fixed in position by bolts after the height is adjusted.

[0012] As a preferred technical solution, the positioning rod, the support rod and the bolts are all made of steel alloy.

[0013] As a preferred technical solution, a method for using a ship steel plate reverse marking projection device includes the following steps:

[0014] Step 1: In the nesting stage, the cutting machine marks the reverse side of the steel plate. Three positioning points are taken at the center of both the front and reverse sides of the steel plate. The positioning points on the front side of the steel plate are in the same position and correspond one by one to the positioning points on the reverse side of the steel plate;

[0015] Step 2: Place the steel plate with the reverse side facing up, and place the bottom ends of the three positioning rods on the three positioning points on the reverse side of the steel plate respectively;

[0016] Step 3: Pull the sliding rod upward from inside the support outer rod. After adjusting the sliding rod to the specified height, pass the bolt through the screw hole on the support outer rod and abut it against the sliding rod to fix the sliding rod;

[0017] Step 4: Take a photo of the image on the reverse side of the steel plate through the projection instrument;

[0018] Step 5: Turn the steel plate over so that the front side of the steel plate is facing up, and place the bottom ends of the positioning rods on the three corresponding positioning points on the front side of the steel plate;

[0019] Step 6: The projection instrument performs mirror image processing on the image on the reverse side of the steel plate, and the projection instrument projects the mirror image processed image onto the front side of the steel plate;

[0020] Step 7: Assemble the parts on the front side of the steel plate according to the marking position on the reverse side of the steel plate in the projection.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] (1) The present invention solves the problem that it is difficult to construct the reverse side marking of the steel plate by photographing the marked area on the reverse side of the steel plate and projecting it onto the front side, eliminating the need for re-calibrating the marking.

[0023] (2) During the process of using this device, after the cutting machine finishes marking, it will not affect the operation of the numerical control cutting machine. Moreover, this device can be applied to steel plates with different thicknesses and shapes for marking, can be recycled, saving time and improving efficiency.

[0024] (3) The present invention realizes the detachable connection between the support outer rod and the sliding rod through a bolt, can adjust the height of the sliding rod, and is convenient for the transportation and storage of the device after the sliding rod is retracted. Description of the Drawings

[0025] Figure 1 This is a schematic structural diagram of a reverse scribing projection device for ship steel plates according to the present invention.

[0026] In the figure: 1. positioning rod; 2. outer support rod; 3. bolt; 4. sliding rod; 5. projector; 6. steel plate. Specific embodiments

[0027] The technical solution of the present invention will be further described below in conjunction with specific embodiments:

[0028] As Figure 1 shown, a reverse scribing projection device for ship steel plates includes a support rod and a projector 5. Positioning points are provided at the same positions on the front and back of the steel plate 6. The support rod is placed on the positioning points, and the projector 5 is installed above the support rod. The projector 5 is used to photograph the image on the back of the steel plate and project the mirrored image onto the front of the steel plate 6. The support rod is used to support the projector 5. The projector 5 is integrated by a camera and a projector. After the camera photographs the image on the back of the steel plate 6, the image is mirrored and then projected onto the front of the steel plate 6 through the projector, so that technicians can assemble parts according to the scribing positions on the projected back of the steel plate 6. The position and size of the image photographed by the camera and the projected image of the projector are the same.

[0029] As Figure 1 shown, a positioning rod 1 is fixed below the support rod, and the positioning rod 1 corresponds to the positioning points one by one. The positioning rod 1 and the positioning points are placed correspondingly to ensure that the device is in the same position before and after the steel plate 6 is turned over, so as to ensure that the scribing position in the projected image is consistent with the actual scribing position on the back of the steel plate 6.

[0030] As Figure 1 shown, the number of positioning points on the same surface of the steel plate 6 is three, and the number of positioning rods 1 is also three. The three positioning rods 1 can support the entire device more stably and prevent the device from toppling.

[0031] As Figure 1 shown, the support rod includes an outer support rod 2 and a sliding rod 4. A through hole is provided at the center of the cross-section of the outer support rod 2, and the sliding rod 4 is arranged in the through hole. The sliding rod 4 can be retracted into the through hole of the outer support rod 2 for the transportation and storage of the device.

[0032] As Figure 1 shown, a screw hole and a bolt 3 are provided at the upper part of the outer support rod 2. The screw hole communicates with the through hole, and a thread matching the bolt 3 is provided in the screw hole. The bolt 3 passes through the screw hole and abuts against the sliding rod 4 to fix the sliding rod 4. The bolt 3 makes the sliding rod 4 abut against the inner wall of the outer support rod 2, thereby fixing the position of the sliding rod 4. Specifically, technicians can provide a plurality of limit holes on the sliding rod 4, and after the bolt 3 passes through the screw hole, it is inserted into the limit hole to better fix the sliding rod 4.

[0033] As Figure 1 shown, the sliding rod 4 can adjust its height. After adjusting the height, the sliding rod 4 is fixed in position by the bolt 3. The sliding rod 4 can move up and down in the through-hole of the support outer rod 2, and after adjusting the height, it is fixed in position by the bolt 3, so that the height of the projector 5 can be adjusted.

[0034] The positioning rod 1, the support outer rod 2, the sliding rod 4 and the bolt 3 are all made of steel alloy. The material of the steel alloy is not easily affected, more stable and has a longer service life.

[0035] As Figure 1 shown, a method of using a ship steel plate reverse marking projection device includes the following steps:

[0036] Step 1: In the nesting stage, the cutting machine marks the reverse side of the steel plate 6. Three positioning points are taken at the center of both the front and back sides of the steel plate 6. The positioning points on the front side of the steel plate 6 are in the same position and correspond one by one to the positioning points on the reverse side of the steel plate 6;

[0037] Step 2: Place the steel plate 6 with its reverse side facing up, and place the bottom ends of the three positioning rods 1 respectively corresponding to the three positioning points on the reverse side of the steel plate 6;

[0038] Step 3: Pull the sliding rod 4 upward from the through-hole of the support rod 2, pass the bolt 3 through the screw hole on the support outer rod 2 and abut it against the sliding rod 4, so that the sliding rod 4 is closely attached to the inner wall of the through-hole of the support rod 2, thereby fixing the position of the sliding rod 4;

[0039] Step 4: Take a picture of the image on the reverse side of the steel plate 6 through the projector 5;

[0040] Step 5: Turn the steel plate 6 over so that the front side of the steel plate 6 is facing up, and place the bottom ends of the three positioning rods 1 respectively corresponding to the three positioning points on the front side of the steel plate 6;

[0041] Step 6: The projector 5 performs mirror image processing on the image on the reverse side of the steel plate 6, and the projector 5 projects the image on the reverse side of the steel plate 6 onto the front side of the steel plate 6;

[0042] Step 7: Assemble parts on the front side of the steel plate 6 according to the marked positions on the reverse side of the projected steel plate 6.

[0043] This embodiment is only a further explanation of the present invention, not a limitation of the present invention. Those skilled in the art can make non-creative modifications to this embodiment as needed after reading this specification, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. A reverse scribing projection device for ship steel plates, characterized in that, It includes a support rod and a projector. Positioning points are provided at the same positions on both the front and back sides of the steel plate. The support rod is placed on the positioning points, and the projector is installed above the support rod. The projector is used to capture the image of the back side of the steel plate and project the mirrored image onto the front side of the steel plate. A positioning rod is fixed below the support rod, and the positioning rods correspond to the positioning points one by one. The number of positioning points on the same side of the steel plate is three, and the number of positioning rods is also three.

2. The anti-scratch line projection device for ship steel plates according to claim 1, characterized in that, The support rod includes an outer support rod and a sliding rod. A through hole is provided at the center of the cross-section of the outer support rod, and the sliding rod is arranged in the through hole.

3. The ship steel plate reverse scribing projection device according to claim 2, characterized in that, A screw hole and a bolt are provided at the upper part of the outer support rod. The screw hole communicates with the through hole, and the screw hole is provided with threads matching the bolt. The bolt passes through the screw hole and abuts against the sliding rod to fix the sliding rod.

4. The anti-scratch projection device for ship steel plates according to claim 3, characterized in that, The height of the sliding rod can be adjusted, and the position of the sliding rod is fixed by the bolt after the height is adjusted.

5. A ship steel plate reverse scribing projection device according to any one of claims 3 or 4, characterized in that, The positioning rod, the support rod, and the bolt are all made of steel alloy.

6. The method of using a reverse scribing projection device for ship steel plates according to claim 3, characterized in that, It includes the following steps: Step 1: In the nesting stage, the cutting machine marks lines on the back side of the steel plate. Three positioning points are taken at the center of both the front and back sides of the steel plate. The positioning points on the front side of the steel plate are in the same position as and correspond to the positioning points on the back side of the steel plate one by one. Step 2: Place the steel plate with the back side facing up, and place the bottoms of the three positioning rods on the three positioning points on the back side of the steel plate respectively. Step 3: Pull the sliding rod upward from the outer support rod. After adjusting the sliding rod to the specified height, pass the bolt through the screw hole on the outer support rod and abut it against the sliding rod to fix the sliding rod. Step 4: Take a photo of the image of the back side of the steel plate through the projector. Step 5: Turn the steel plate over so that the front side of the steel plate faces up, and place the bottoms of the positioning rods on the three corresponding positioning points on the front side of the steel plate. Step 6: The projector mirrors the image of the back side of the steel plate, and the projector projects the mirrored image onto the front side of the steel plate. Step 7: Assemble the parts on the front side of the steel plate according to the marked line position of the back side of the steel plate in the projection.

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