A method for shaft hole matching detection
The use of the shaft hole fitting inspection device has solved the problems of jamming and wear during the assembly of shaft holes and shafts, achieving efficient inspection and grinding, extending the service life of shafts and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HUDONG ZHONGHUA SHIPBUILDINGGROUP
- Filing Date
- 2022-09-29
- Publication Date
- 2026-06-09
AI Technical Summary
In shipbuilding, jamming or excessive wear can easily occur during the assembly of shaft holes and shafts, leading to a reduction in the service life of the shaft. Existing technologies are unable to effectively detect and solve this problem.
A shaft hole fitting inspection device is used. The fitting handle and the grinding ring reciprocate within the shaft hole to inspect the form and position tolerances and the surface finish of the inner wall of the shaft hole. Areas that do not meet the requirements are ground. Deformed areas are marked with different colored markers. The inspection is completed by combining lighting equipment and an inner diameter caliper.
It improves the assembly quality of the shaft hole, avoids jamming and excessive wear, extends the service life of the shaft, improves inspection efficiency, and reduces production costs.
Smart Images
Figure CN115682887B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of shipbuilding technology, and in particular relates to a method for detecting shaft hole misfit. Background Technology
[0002] Ships extensively utilize mechanical equipment, and some large pieces of equipment must operate underwater, such as shafting, propellers, and anti-roll fins. Because of this underwater operation, the equipment requires power input from the propeller shaft and fin shaft. As these are underwater components, the watertightness requirements for the propeller shaft and fin shaft are relatively high. Generally, the fin shaft and propeller shaft are fitted with bushings using clearance fits, typically within 0.5mm. Since the fin shaft and propeller shaft are machined parts with high precision, shipyards need to perform positioning, assembly, and welding on the cast steel parts for the fin shaft holes and shaft bracket holes. Because the cast steel plates are often over 30mm thick, the welding current is high, resulting in significant welding deformation. This alters the dimensional and positional tolerances of the shaft holes, making it prone to jamming or excessive wear when the shaft is assembled into the holes, thus reducing the shaft's service life. Summary of the Invention
[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for detecting shaft hole misfit. The method of this invention uses a shaft hole misfit detection device to detect the deformation value of the shaft hole form and position tolerance, and at the same time detects the surface finish of the inner wall of the shaft hole. It also grinds the shaft hole area that does not meet the requirements, thereby avoiding the problem of the shaft getting stuck or excessively worn when installed in the shaft hole and improving the service life of the shaft.
[0004] To achieve the above-mentioned objectives, the technical solution provided by this invention patent is as follows:
[0005] A method for detecting misfitting of shaft holes, the method specifically includes the following steps:
[0006] The first step is to install the shaft hole in the corresponding position on the ship, then weld and fix the upper two sides of the shaft hole to the shaft hole seat, and weld and fix the lower end of the shaft hole to the hull plate. A reinforcing plate is installed on the side of the shaft hole between the shaft hole seat and the hull plate, and the upper and lower ends of the reinforcing plate are welded and fixed to the shaft hole respectively.
[0007] The second step is to prepare a shaft hole fitting and testing device after the shaft hole installation and welding are completed. The device includes a fitting handle and a grinding ring. Red powder is evenly applied to the inner wall of the shaft hole, and the fitting handle is connected and fixed to the grinding ring.
[0008] The third step is to connect and fix the grinding handle to the grinding ring, then evenly apply blue paint to the side of the grinding ring, insert the grinding ring into the shaft hole through the grinding handle, and perform shaft hole grinding test by pushing the grinding handle back and forth to make the grinding ring reciprocate in the shaft hole.
[0009] The fourth step is to remove the grinding ring from the shaft hole by using the grinding handle after the grinding ring has completed its reciprocating motion within the shaft hole. Then, illuminate the inner wall of the shaft hole with a light and mark all the reflective bright spots inside the shaft hole.
[0010] Fifth step: The construction personnel use the polishing equipment to polish the reflective bright spots marked in the fourth step in sequence. After polishing, red powder is applied to the inner wall of the shaft hole in the polishing area, and blue paint is evenly applied to the side of the polishing ring. The polishing ring is inserted into the shaft hole through the polishing handle, so that the polishing ring moves back and forth in the shaft hole to repeatedly polish the shaft hole.
[0011] Step 6: After the inner wall of the shaft hole in the polished area is evenly coated with blue paint after repeated fitting tests, use an inner diameter caliper to measure the inner diameter of the shaft hole in the polished area. When the inner diameter of the shaft hole in the polished area meets the standard size of the shaft hole inner diameter, the shaft hole fitting test is completed.
[0012] The above-mentioned brush handle is in the shape of a hollow cylinder. One end of the brush handle is provided with an external thread, and the other end of the brush handle is provided with a crossbar, which is perpendicularly connected to the end of the brush handle.
[0013] The aforementioned brush handle has a diameter of 30mm, a length of 700mm, and is made of stainless steel.
[0014] The aforementioned grinding ring is generally circular in shape, with a circular hole in the middle. The circular hole in the middle of the grinding ring has an internal thread, and the outside of the circular hole in the middle of the grinding ring is connected and fixed to the inner wall of the grinding ring by a reinforcing wheel; the grinding ring is made of aluminum alloy.
[0015] The aforementioned reinforcing wheels are evenly distributed between the circular hole in the middle of the grinding ring and the inner wall of the grinding ring. The reinforcing wheels are perpendicularly connected to the circular hole in the middle of the grinding ring and the inner wall of the grinding ring, respectively. The internal thread in the middle of the grinding ring matches the external thread on the grinding handle.
[0016] The width of the aforementioned grinding ring is not less than 60mm, and the diameter of the grinding ring is 0.2mm-0.3mm smaller than the inner diameter of the shaft hole to be measured.
[0017] In the third step above, when the grinding ring reciprocates within the shaft hole, the grinding ring reciprocates at least five times within the shaft hole. One reciprocating motion is when the grinding ring moves from the upper end of the shaft hole to the lower end of the shaft hole and then from the lower end of the shaft hole to the upper end of the shaft hole.
[0018] When the aforementioned grinding ring reciprocates within the shaft hole, the area with a qualified inner diameter of the shaft hole is evenly coated with blue paint on the grinding ring, while the area with a shaft hole inner diameter smaller than the qualified size is rubbed into reflective bright spots by the grinding ring.
[0019] The lighting device in step four above is a flashlight or other light-emitting device.
[0020] The grinding equipment in step 5 above is either an automatic grinding machine or a manual grinding wheel.
[0021] Based on the above technical solution, the present invention patent's method for detecting shaft hole misfit has achieved the following technical advantages through practical application:
[0022] 1. The present invention provides a method for detecting shaft hole misfit by using a shaft hole misfit detection device to detect the deformation value of the shaft hole form and position tolerance, and at the same time detect the surface finish of the inner wall of the shaft hole, and grind the shaft hole area that does not meet the requirements, thereby avoiding the problem of shaft jamming or excessive wear when installed in the shaft hole, and improving the service life of the shaft.
[0023] 2. The present invention provides a method for detecting the mating of shaft holes by using a grinding ring to reciprocate within the shaft hole and by applying different colored marking pigments to the shaft hole and the grinding ring, which facilitates the location of deformed areas within the shaft hole and improves detection efficiency.
[0024] 3. The present invention provides a method for detecting shaft hole mating by making the grinding ring into a hollow ring shape, which reduces the weight of the grinding ring. At the same time, the grinding ring is reinforced by a reinforcing wheel, which improves the efficiency of using the grinding ring, avoids deformation of the grinding ring, and reduces production costs. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of shaft hole mating detection in a shaft hole mating detection method of the present invention.
[0026] Figure 2 This is a front view of a shaft hole fitting detection device used in a shaft hole fitting detection method according to the present invention.
[0027] Figure 3 This is a top view of a shaft hole fitting detection device used in a shaft hole fitting detection method according to the present invention. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the following description is provided with reference to the accompanying drawings.
[0029] The invention is described using specific examples shown. However, it should be understood that these descriptions are merely exemplary.
[0030] This description is intended not to limit the scope of the invention. Furthermore, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the invention.
[0031] like Figure 1-3The present invention pertains to a method for detecting shaft hole misfitting, which specifically includes the following steps:
[0032] First, after installing the shaft hole 2 in the corresponding position on the ship, weld and fix the upper two sides of the shaft hole 2 to the shaft hole seat 21, and weld and fix the lower end of the shaft hole 2 to the hull plate 23. Install a reinforcing plate 22 on the side of the shaft hole 2 between the shaft hole seat 21 and the hull plate 23. The upper and lower ends of the reinforcing plate 22 are welded and fixed to the shaft hole 2 respectively.
[0033] The second step, after the shaft hole 2 is installed and welded, prepares for the shaft hole fitting inspection device 1. This device includes a fitting handle 13 and a polishing ring 11. Red powder is evenly applied to the inner wall of the shaft hole 2, and the fitting handle 13 is connected and fixed to the polishing ring 11. By using the shaft hole fitting inspection device 1 to detect the form and position tolerance deformation value of the shaft hole 2, and at the same time to detect the surface finish of the inner wall of the shaft hole 2, the shaft hole 2 areas that do not meet the requirements are polished, which avoids the problem of the shaft getting stuck or excessively worn when installed in the shaft hole 2, and improves the service life of the shaft.
[0034] The third step is to connect and fix the grinding handle 13 to the grinding ring 11, then apply blue paint evenly to the side of the grinding ring 11, insert the grinding ring 11 into the shaft hole 2 through the grinding handle 13, and perform the grinding ring 11 reciprocating motion in the shaft hole 2 by pushing the grinding handle 13 back and forth to perform the grinding test of the shaft hole 2.
[0035] Fourth step: After the grinding ring 11 completes its reciprocating motion in the shaft hole 2, the grinding ring 11 is removed from the shaft hole 2 by the grinding handle 13, the inner wall of the shaft hole 2 is illuminated by the lighting equipment, and all reflective bright spots in the shaft hole 2 are marked.
[0036] In the fifth step, the construction personnel use a polishing device to polish the reflective bright spots marked in the fourth step in sequence. After polishing, red powder is applied to the inner wall of the shaft hole 2 in the polishing area, and blue paint is evenly applied to the side of the polishing ring 11. The polishing ring 11 is inserted into the shaft hole 2 through the polishing handle 13, so that the polishing ring 11 moves back and forth in the shaft hole 2 to perform repeated polishing tests on the shaft hole 2.
[0037] Step 6: After the inner wall of the shaft hole 2 in the polished area is evenly coated with blue paint after repeated fitting tests, the inner diameter of the shaft hole 2 in the polished area is measured using an inner diameter caliper. When the inner diameter of the shaft hole 2 in the polished area meets the standard size of the inner diameter of the shaft hole 2, the fitting test of the shaft hole 2 is completed.
[0038] The aforementioned brushing handle 13 is generally in the shape of a hollow cylinder. One end of the brushing handle 13 is provided with an external thread, and the other end of the brushing handle 13 is provided with a crossbar 14, which is perpendicularly connected to the end of the brushing handle 13. By making the brushing ring 11 into a hollow ring shape, the weight of the brushing ring 11 is reduced, and the reinforcing wheel 12 reinforces the brushing ring 11, thereby improving the efficiency of using the brushing ring 11 and avoiding deformation of the brushing ring 11, thus reducing production costs. The crossbar 14 on the brushing handle 13 facilitates pushing or pulling the brushing ring 11 during use.
[0039] The aforementioned brush handle 13 has a diameter of 30mm, a length of 700mm, and is made of stainless steel.
[0040] The aforementioned grinding ring 11 is generally circular in shape, with a circular hole 15 in the center. An internal thread is provided within the circular hole 15. The outer part of the circular hole 15 is connected and fixed to the inner wall of the grinding ring 11 via a reinforcing wheel 12. The grinding ring 11 is made of aluminum alloy. By using the grinding ring 11 to reciprocate within the shaft hole 2, and by applying different colored marking pigments to the shaft hole 2 and the grinding ring 11, it is easier to locate deformation areas within the shaft hole 2, thus improving detection efficiency. The grinding ring 11 is made of a hollow ring and is also made of aluminum alloy, reducing its weight and allowing for single-person operation, thereby reducing labor costs.
[0041] The reinforcing wheels 12 are evenly distributed between the round hole 15 in the middle of the grinding ring 11 and the inner wall of the grinding ring 11. The reinforcing wheels 12 are perpendicularly connected to the round hole 15 in the middle of the grinding ring 11 and the inner wall of the grinding ring 11, respectively. The internal thread in the middle of the grinding ring 11 matches the external thread on the grinding handle 13.
[0042] The width of the aforementioned grinding ring 11 is not less than 60mm, and the diameter of the grinding ring 11 is 0.2mm-0.3mm smaller than the inner diameter of the shaft hole 2 to be measured; grinding rings 11 of different diameters are made according to the inner diameter of the shaft hole 2 to be measured in order to adapt to the detection of shaft holes 2 of different diameters.
[0043] When the grinding ring 11 in the third step above reciprocates within the shaft hole 2, the grinding ring 11 reciprocates at least five times within the shaft hole 2. The grinding ring 11 moves from the upper end of the shaft hole 2 to the lower end of the shaft hole 2, and then moves from the lower end of the shaft hole 2 to the upper end of the shaft hole 2, which constitutes one reciprocating motion.
[0044] When the aforementioned polishing ring 11 reciprocates within the shaft hole 2, the area with a qualified inner diameter of the shaft hole 2 is evenly coated with blue paint on the polishing ring 11, while the area with an inner diameter smaller than the qualified size is rubbed into reflective bright spots by the polishing ring 11.
[0045] The lighting device in step four above is a flashlight or other light-emitting device.
[0046] The grinding equipment in step 5 above is either an automatic grinding machine or a manual grinding wheel.
[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, the scope of the invention is not limited to this.
[0048] Those skilled in the art should understand that modifications can still be made to the specific implementation of the invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solution claimed in the present invention.
Claims
1. A method for detecting misfitting of shaft holes, characterized in that, This method is specific Includes the following steps: First, after installing the shaft hole (2) in the corresponding position on the ship, weld the upper two sides of the shaft hole (2) to the shaft hole seat (21) and weld the lower end of the shaft hole (2) to the hull plate (23). Install a reinforcing plate (22) on the side of the shaft hole (2) between the shaft hole seat (21) and the hull plate (23). The upper and lower ends of the reinforcing plate (22) are welded to the shaft hole (2) respectively. The second step is to prepare a shaft hole (2) for a brushing test device (1) after the shaft hole (2) is installed and welded. The device includes a brushing handle (13) and a brushing ring (11). Red powder is evenly applied to the inner wall of the shaft hole (2), and the brushing handle (13) is connected and fixed to the brushing ring (11). The third step is to connect and fix the grinding handle (13) to the grinding ring (11), apply blue paint evenly to the side of the grinding ring (11), insert the grinding ring (11) into the shaft hole (2) through the grinding handle (13), and make the grinding ring (11) reciprocate in the shaft hole (2) by pushing the grinding handle (13) back and forth to perform the grinding test of the shaft hole (2); Fourth step: After the grinding ring (11) completes its reciprocating motion in the shaft hole (2), the grinding ring (11) is removed from the shaft hole (2) by the grinding handle (13), the inner wall of the shaft hole (2) is illuminated by the lighting equipment, and all the reflective bright spots in the shaft hole (2) are marked. In the fifth step, the construction personnel use a polishing device to polish the reflective highlights marked in the fourth step in sequence. After polishing, red powder is applied to the inner wall of the shaft hole (2) in the polishing area, and blue paint is evenly applied to the side of the polishing ring (11). The polishing ring (11) is inserted into the shaft hole (2) through the polishing handle (13), so that the polishing ring (11) moves back and forth in the shaft hole (2) to perform repeated polishing tests on the shaft hole (2). Step 6: When the inner wall of the shaft hole (2) in the polished area after repeated polishing test is evenly coated with blue paint, the inner diameter of the shaft hole (2) in the polished area is measured with an inner diameter caliper. When the inner diameter of the shaft hole (2) in the polished area meets the standard size of the inner diameter of the shaft hole (2), the polishing test of the shaft hole (2) is completed.
2. The method for detecting shaft hole misfit according to claim 1, characterized in that, The brush handle (13) is a hollow cylinder in shape. One end of the brush handle (13) is provided with an external thread, and the other end of the brush handle (13) is provided with a crossbar (14). The crossbar (14) is vertically connected to the end of the brush handle (13).
3. The method for detecting shaft hole misfit according to claim 2, characterized in that, The diameter of the brush handle (13) is 30mm, the length of the brush handle (13) is 700mm, and the brush handle (13) is made of stainless steel.
4. The method for detecting shaft hole misfit according to claim 1, characterized in that, The grinding ring (11) is generally circular in shape. A circular hole (15) is provided in the middle of the grinding ring (11). An internal thread is provided in the circular hole (15) in the middle of the grinding ring (11). The outside of the circular hole (15) in the middle of the grinding ring (11) is connected and fixed to the inner wall of the grinding ring (11) by a reinforcing wheel (12). The grinding ring (11) is made of aluminum alloy.
5. The method for detecting shaft hole misfit according to claim 4, characterized in that, The reinforcing wheels (12) are evenly distributed between the round hole (15) in the middle of the grinding ring (11) and the inner wall of the grinding ring (11). The reinforcing wheels (12) are perpendicularly connected to the round hole (15) in the middle of the grinding ring (11) and the inner wall of the grinding ring (11). The internal thread in the middle of the grinding ring (11) matches the external thread on the grinding handle (13).
6. The method for detecting shaft hole misfit according to claim 4, characterized in that, The width of the grinding ring (11) is not less than 60 mm, and the diameter of the grinding ring (11) is 0.2 mm to 0.3 mm smaller than the inner diameter of the shaft hole (2) to be measured.
7. The method for detecting shaft hole misfit according to claim 1, characterized in that, When the grinding ring (11) in the third step reciprocates in the shaft hole (2), the grinding ring (11) reciprocates in the shaft hole (2) at least five times. The grinding ring (11) moves from the upper end of the shaft hole (2) to the lower end of the shaft hole (2) and then moves from the lower end of the shaft hole (2) to the upper end of the shaft hole (2) as one reciprocating motion.
8. The method for detecting shaft hole misfit according to claim 7, characterized in that, When the grinding ring (11) reciprocates in the shaft hole (2), the area with a qualified inner diameter of the shaft hole (2) is evenly coated with blue paint on the grinding ring (11), and the area with a smaller inner diameter than the qualified size is rubbed into reflective bright spots by the grinding ring (11).
9. The method for detecting misfitting shaft holes according to claim 1, characterized in that, The lighting device in the fourth step is a flashlight or other light-emitting device.
10. A method for detecting shaft hole misfit according to claim 1, characterized in that, The grinding equipment in the fifth step is an automatic grinding machine or a manual grinding wheel.