A device and method for precise pre-drilling and positioning of air ducts in shipboard horizontal fans.

Abstract

This invention relates to a device and method for precise pre-drilling and positioning of ductwork in the bulkhead of a horizontal marine blower. The device includes a base, a rotating column mounting base, and a rotating column. The rotating column is horizontally positioned and its position relative to the mounting base is adjustable along its horizontal length. One end of the rotating column has a hand crank, and the other end has two synchronously opening and closing levers. One end of each lever is hinged to the rotating column, and the other end forms a marking end. An angle locking plate is also provided at the included angle between the two levers to limit the opening angle. By installing the device on the base panel of the horizontal blower, the pre-drilling position of the ductwork in the bulkhead can be precisely positioned at the bulkhead. Drilling according to this positioning ensures the accuracy of the ductwork's connection to the blower after installation.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding, specifically to a device and method for precise pre-drilling and positioning of air duct bulkheads for horizontal shipboard fans. Background Technology

[0002] Ships have numerous piping systems, such as fuel systems, lubrication systems, cooling systems, compressed air systems, and ventilation systems. The ventilation system falls under the category of cold, air, and ventilation (CAV) systems, typically using electric fans as the power source, with piping and certain bulkheads serving as channels, and various types of ventilation heads at the end for output. Common fan types include axial fans and centrifugal fans. Ducts come in both circular and rectangular shapes. In some areas, due to space constraints, bulkheads may be used as air ducts. Fans are mainly classified by installation method as horizontal or vertical, and by direction of rotation as exhaust or supply fans.

[0003] Because ventilation fans are relatively large, they are generally installed on fan bases on the deck. Horizontal fans also require ductwork through the bulkhead for air extraction. Therefore, during the installation of horizontal fans, holes need to be drilled in the bulkhead to ensure the accuracy of the hole position for the ductwork connection after the fan is installed on the fan base. In current construction processes, the holes and ductwork are usually drilled and installed in the later stages of ship construction, when the fans are installed. At this time, since the painting work has been completed, drilling, cutting, and welding would damage the paint. If the holes are drilled in advance before the fans are installed, the positional accuracy of the holes in the bulkhead is difficult to control. Summary of the Invention

[0004] To address the challenge of controlling the precise positioning of openings at the ductwork penetration points of horizontal blowers, this invention provides a device and method for precise pre-drilling and positioning of ductwork in shipboard blowers. The openings are completed before painting to ensure alignment accuracy during subsequent duct and blower installation.

[0005] The technical objective of this invention is achieved through the following technical solution:

[0006] A device for precise pre-drilling and positioning of air ducts in shipboard horizontal blowers includes a base, a rotating column mounting seat mounted on the base, and a rotating column rotatably mounted within the rotating column mounting seat. The rotating column is horizontally positioned, and its position relative to the rotating column mounting seat along its horizontal length is adjustable. One end of the rotating column is equipped with a hand crank, and the other end is equipped with two synchronously opening and closing levers. One end of each lever is hinged to the rotating column, and the other end forms a marking end. An angle locking plate is also provided at the opening and closing angle of the two levers to limit the opening and closing angle between them. The angle locking plate is equipped with an arc-shaped limiting hole, and a guide post is provided on each lever corresponding to the limiting hole. The guide post passes through the limiting hole and is equipped with a locking nut, and the locking nut and the guide post are threaded together.

[0007] Furthermore, the angle locking plate is also provided with angle scale lines along the arc direction of the limiting hole corresponding to the limiting hole.

[0008] Furthermore, synchronous rotating wheels are respectively provided at the hinge connection between the two rods and the rotating column, and the synchronous rotating wheels of the two rods are in contact with each other.

[0009] Furthermore, the angle locking plate is fixedly connected to the rotating rod.

[0010] Furthermore, the base includes a flange mounting surface and a support column vertically fixed to the upper end of the flange mounting surface; a lead screw is also connected between the support column and the rotating column mounting seat, the upper end of the lead screw is rotatably connected to the rotating column mounting seat through a bearing, the support column is provided with an adjustment channel for adjusting the lifting of the lead screw at the lower end of the lead screw, the support column is provided with an adjustment hole corresponding to the adjustment channel, and a lead screw nut is provided in the adjustment hole to fit the lead screw.

[0011] Furthermore, a guide post is provided between the rotating column mounting base and the support column. The upper end of the guide post is connected and fixed to the lower end face of the rotating column mounting base. The support column is provided with a guide hole corresponding to the lower end of the guide post, and the lower end of the guide post is inserted into the guide hole.

[0012] Furthermore, the base is also equipped with a level to check the levelness of the base installation position.

[0013] Furthermore, the rotating column mounting base is provided with a horizontally set mounting hole. The rotating column includes a core column, a bearing, and a sleeve. The core column is installed in the sleeve through the bearing, and the sleeve is slidably inserted into the mounting hole. The sliding rod is hinged to the core column, and the hand crank is installed at the end of the core column.

[0014] This invention also provides a method for precise pre-drilling and positioning of holes in the bulkhead of a ship's horizontal fan duct. This method utilizes the aforementioned device for precise pre-drilling and positioning of holes in the bulkhead of a ship's horizontal fan duct. The method includes:

[0015] Step 1: Place the base on the base panel of the horizontal fan, adjust the position of the base on the base panel so that the rotating column is above the central axis of the base panel and perpendicular to the hull wall, and connect and fix the base to the base panel with the connector.

[0016] Step 2: Adjust the opening angle between the two scribing rods according to the required hole size. The distance between the scribing ends is D, and the diameter of the hole to be made is R, satisfying D=R. After adjustment, lock the opening angle between the two scribing rods with the angle locking plate.

[0017] Step 3: Move the rotating column relative to the rotating column mounting base so that the scribing end contacts the bulkhead; rotate the hand crank to make the scribing end draw a circular outline on the bulkhead; tap out several slap marks evenly along the circular outline.

[0018] Step 4: Cut the bulkhead along the outline, adding a 6-10mm cutting allowance during the cutting process.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] This invention installs a precise pre-drilling positioning device for the ductwork of a horizontal ship's blower onto the base panel of the blower. This allows for precise positioning of the drilling location at the ductwork, ensuring the accuracy of the ductwork's connection to the blower after installation. Furthermore, it improves the accuracy of the drilling location and enables pre-drilling before blower installation, preventing damage to the coating caused by later drilling or low drilling accuracy. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the pre-drilled positioning device for the duct wall of a ship's horizontal fan in Embodiment 1 of the present invention.

[0022] Figure 2 This is a schematic diagram of the rotating column structure in Embodiment 1 of the present invention.

[0023] Figure 3 This is a schematic diagram of the synchronous rotating wheel arrangement in Embodiment 2 of the present invention.

[0024] Figure 4 This is a schematic diagram of the angle locking plate arrangement in Embodiment 3 of the present invention.

[0025] Figure 5 This is a schematic diagram of the pre-drilled hole positioning device for the duct wall of a ship's horizontal fan in Embodiment 4 of the present invention.

[0026] Figure 6 This is a schematic diagram of the precise pre-drilling and positioning device for the ductwork of a ship's horizontal fan in Embodiment 5 of the present invention.

[0027] Figure 7 This is a schematic diagram of the base structure in Embodiment 1 of the present invention.

[0028] In the picture:

[0029] 1. Base; 2. Rotating column mounting seat; 3. Rotating column; 4. Hand crank; 5. Sliding rod; 6. Angle locking plate; 7. Limiting hole; 8. Guide column; 9. Mounting hole; 10. Core column; 11. Bearing; 12. Sleeve; 13. Locking pin; 14. Synchronous rotating wheel; 15. Connecting rod; 16. Flange mounting surface; 17. Support column; 18. Lead screw; 19. Adjustment hole; 20. Lead screw nut; 21. Guide column; 22. Guide hole; 23. Level; 24. Base panel; 25. Bulkhead. Detailed Implementation

[0030] The technical solution of the present invention will be further described below with reference to specific embodiments:

[0031] Example 1

[0032] A device for precise pre-drilling and positioning of air ducts in shipboard horizontal fans, such as... Figure 1 As shown, the system includes a base 1, a rotating column mounting base 2 mounted on the base 1, and a rotating column 3 rotatably mounted within the rotating column mounting base 2. The rotating column 3 is horizontally positioned, and its position relative to the rotating column mounting base 2 along its horizontal length is adjustable. One end of the rotating column 3 is equipped with a hand crank 4, and the other end of the rotating column 3 is equipped with two synchronously opening and closing levers 5. One end of each lever 5 is hinged to the rotating column 3, and the other end of each lever 5 forms a scribing end. In this embodiment, the scribing end is a sharp point, which forms a scratch on the bulkhead when scribing. An angle locking plate 6 is also provided at the opening and closing angle of the two levers 5 to limit the opening and closing angle between the two levers. The angle locking plate 6 is equipped with an arc-shaped limiting hole 7, and each lever 5 is equipped with a guide post 8 corresponding to the limiting hole 7. The guide post 8 passes through the limiting hole 7 and is equipped with a locking nut. The locking nut and the guide post 8 are threaded together. By tightening the locking nut, the angle locking plate can be clamped to achieve the purpose of angle fixation.

[0033] More specifically, angle scale lines are also provided on the angle locking plate along the arc direction of the limiting hole corresponding to the limiting hole.

[0034] More specifically, such as Figure 2 As shown, the rotating column mounting base 2 is provided with a horizontally arranged mounting hole 9. The rotating column includes a core column 10, a bearing 11, and a sleeve 12. The core column 10 is installed in the sleeve 12 through the bearing 11, and the sleeve 12 is slidably inserted into the mounting hole 9. The sliding rod 5 is hinged to the core column 10, and the hand crank 4 is installed at the end of the core column 10.

[0035] Furthermore, a threaded hole can be provided on the side wall of the rotating column mounting base 2 corresponding to the mounting hole 9, and a locking pin 13 can be installed in the threaded hole. After the sleeve 12 is adjusted relative to the mounting hole 9, the locking pin 13 abuts against the sleeve 12 to fix the position of the sleeve.

[0036] In this embodiment, the base 1 is arranged in a herringbone shape, with the two root parts of the herringbone forming flange mounting surfaces, such as... Figure 7 As shown.

[0037] Example 2

[0038] To ensure synchronized movement of the two levers, synchronized rotating wheels 14 are installed at the hinged connections between the two levers and the rotating column, such as... Figure 3 As shown, the synchronously rotating wheels of the two levers 5 are in contact with each other.

[0039] In one implementation, the synchronous rotating wheel 14 can be an elastic arc surface, increasing friction through elastic compression. A layer of rubber can be wrapped around the outside of the synchronous rotating wheel 14 to increase friction and ensure that the two levers rotate synchronously.

[0040] In another implementation, the synchronous rotating wheel can also be two meshing gears, which achieve synchronous rotation through gear meshing.

[0041] Example 3

[0042] As a preferred option, such as Figure 4 As shown, the angle locking plate 6 is fixedly connected to the rotating column 3. The angle locking plate 6 is fixedly connected to the rotating column 3 by two connecting rods 15. When adjusting the slider 5, only the slider needs to be rotated, and the angle locking plate 6 will not move with the slider.

[0043] Example 4

[0044] like Figure 5 As shown, the base includes a flange mounting surface 16 and a support column 17 vertically fixed to the upper end of the flange mounting surface. A lead screw 18 is connected between the support column 17 and the rotating column mounting base 2. The upper end of the lead screw 18 is rotatably connected to the rotating column mounting base 2 via a bearing. The support column 17 is provided with an adjustment channel for adjusting the height of the lead screw at its lower end. The support column 17 is provided with an adjustment hole 19 corresponding to the adjustment channel. A lead screw nut 20 is provided in the adjustment hole 19 to fit the lead screw 18. By rotating the lead screw nut 20, the center height of the marking rod can be adjusted, reducing the excessive height difference between the center height of the opening and the base panel caused by other factors.

[0045] A guide post 21 is also provided between the rotating column mounting base 2 and the support column 17. The upper end of the guide post 21 is connected and fixed to the lower end face of the rotating column mounting base 2. The support column 17 is provided with a guide hole 22 corresponding to the lower end of the guide post 21. The lower end of the guide post 21 is inserted into the guide hole 22.

[0046] As a preferred option, a level 23 is also provided on the base to check the levelness of the base installation position. The level can be an electronic level or a bubble level, which facilitates the inspection of the levelness of the base panel and improves the positioning accuracy of the opening.

[0047] Example 5

[0048] This invention also provides a method for precise pre-drilling and positioning of air ducts in shipboard horizontal fans, such as... Figure 6 As shown, the method includes:

[0049] Step 1: Place the base on the base panel 24 of the horizontal fan, adjust the position of the base 1 on the base panel 24 so that the rotating column 3 is located above the central axis of the base panel 24 and perpendicular to the hull wall 25, and connect and fix the base 1 to the base panel 24 through the connector.

[0050] Step 2: Adjust the opening angle between the two scribes 5 according to the required hole size. The distance between the scribe ends is D, and the diameter of the hole to be made is R, satisfying D=R. After adjustment, lock the opening angle between the two scribes 5 with the angle locking plate 6.

[0051] Step 3: Move the rotating column relative to the mounting base of the rotating column 3 so that the scribing end contacts the bulkhead 25; rotate the hand crank to make the scribing end draw a circular outline on the bulkhead 25; tap out several slap marks evenly along the circular outline.

[0052] Step 4: Cut the bulkhead along the outline, adding a 6-10mm cutting allowance during the cut, and also removing the spur marks during the cut.

[0053] This embodiment is merely a further explanation of the present invention and is not intended to limit the present invention. Those skilled in the art can make non-inventive modifications to this embodiment as needed after reading this specification, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A method for accurate pre-punching positioning of a ship's horizontal fan duct bulkhead, characterized in that, The method is positioned by a precise pre-punching positioning device of a ship horizontal fan air pipe bulkhead, comprising a base, a rotating column mounting seat mounted on the base, and a rotating column mounted in the rotating column mounting seat, the rotating column is horizontally arranged, and the position of the rotating column along the horizontal length direction is adjustable relative to the rotating column mounting seat; one end of the rotating column is provided with a hand crank, and the other end of the rotating column is provided with two synchronous opening and closing marking rods, one end of the marking rod is hingedly mounted on the rotating column, and the other end of the marking rod forms a marking end; the opening and closing angle between the two marking rods is also provided with an angle locking plate for limiting the opening and closing angle between the two marking rods, the angle locking plate is provided with a circular arc limiting hole, the marking rod is provided with a guide column corresponding to the limiting hole, the guide column passes through the limiting hole and is provided with a locking nut, the locking nut is threadedly connected with the guide column, and an angle scale line is arranged on the angle locking plate corresponding to the limiting hole along the circular arc direction of the limiting hole, the hingedly connected portions of the two marking rods and the rotating column are respectively provided with synchronous rotating wheels, the synchronous rotating wheels of the two marking rods are in contact with each other, the angle locking plate and the rotating column are fixedly connected, the rotating column mounting seat is provided with a mounting hole arranged horizontally, the rotating column comprises a core column, a bearing and a sleeve, the core column is mounted in the sleeve through the bearing, and the sleeve is slidably inserted into the mounting hole; the marking rod is hingedly connected with the core column, and the hand crank is mounted at the end of the core column, and the method comprises the following steps: Step 1, place the base on the base panel of the horizontal fan, adjust the position of the base on the base panel so that the rotating column is above the central axis of the base panel and is perpendicular to the bulkhead, and connect and fix the base and the base panel through the connecting piece; Step 2, adjust the opening and closing degree between the two marking rods according to the required opening size, the distance between the marking ends is D, and the diameter of the opening to be opened is R, which satisfies D=R, and after the adjustment is completed, the opening and closing angle between the two marking rods is locked through the angle locking plate; Step 3, move the rotating column relative to the rotating column mounting seat so that the marking end contacts the bulkhead; rotate the hand crank to make the marking end draw a circular contour line on the bulkhead; evenly knock out several points along the circular contour line; Step 4, cut the bulkhead along the contour line, and add a cutting allowance of 6-10 mm during cutting.

2. The method for accurately pre-positioning the opening of the wind pipe bulkhead of the horizontal fan of the ship according to claim 1, characterized in that, The base comprises a flange mounting surface and a support column vertically fixed on the upper end of the flange mounting surface; a lead screw is further connected between the support column and the rotating column mounting seat, the upper end of the lead screw is rotatably connected with the rotating column mounting seat through a bearing, the support column is provided with an adjusting channel for adjusting the lead screw in a lifting manner, the support column is provided with an adjusting hole corresponding to the adjusting channel, and a lead screw nut is arranged in the adjusting hole and matched with the lead screw.

3. The method of claim 2, wherein, A guide column is further arranged between the rotating column mounting seat and the support column, the upper end of the guide column is fixedly connected with the lower end surface of the rotating column mounting seat, the support column is provided with a guide hole corresponding to the lower end of the guide column, and the lower end of the guide column is matched and inserted into the guide hole.

4. The method of claim 1, wherein, A level is further arranged on the base panel to check the levelness of the base installation position.

Images