Pipe joint nozzle outer conical surface grinding device

Abstract

The utility model discloses a grinding device for the outer conical surface of a pipe joint nozzle. The grinding device comprises a grinding body, abrasive paper, a sleeve and a bottom cover. When the outer conical surface of the pipe joint needs to be repaired, the bottom cover is firstly connected with the first outer thread of the pipe joint through the second inner thread, and then the lower end of the sleeve is connected with the second outer thread of the bottom cover through the first inner thread. In this way, the bottom cover and the sleeve are fixed to the pipe joint. The sheared abrasive paper is clamped in the inner conical surface of the grinding body through the paper clamping groove, then the second end of the grinding body extends into the sleeve from the end, not provided with the second internal thread, of the sleeve along the sleeve till the inner conical surface of the second end makes contact with the outer conical surface of the pipe joint nozzle, the grinding body is connected to a drilling tool, the drilling tool is held by hand to push and pull the grinding body in the sleeve in a reciprocating mode, and the grinding body is ground. And the outer conical surface of the pipe joint nozzle can be polished. The guide circular plate and the inner wall of the sleeve can slide relatively, the sleeve can guide the grinding body, the grinding body and the pipe joint nozzle keep high coaxiality, and therefore the quality of the ground outer conical surface is high.

Description

Technical Field

[0001] This application relates to the field of repair tool technology, and in particular to a device for grinding the outer conical surface of a pipe fitting. Background Technology

[0002] In aero-engines, numerous interconnected conduits form the engine's piping system, primarily responsible for transporting media such as hydraulic oil, fuel, lubricating oil, and compressed air. This system is a crucial component for the normal operation and performance of the aero-engine. During the installation, disassembly, and use of these conduits, wear, dents, pressure marks, and scratches frequently occur at the conduit fittings, leading to frequent leaks. Furthermore, the fittings are located at the connection points of the conduits, and their conical surfaces must meet requirements for strong connection stability, good sealing, and precise dimensions. Therefore, repairing conduit fitting faults is a key focus for maintenance companies. Due to the significant structural variations and inconsistent materials used in aero-engine conduits, the fittings vary greatly in shape and size, and are numerous, making the repair process complex and challenging. Therefore, the selection of grinding tools and sandpaper specifications during troubleshooting must be determined based on factors such as the radius of the joint, the angle of the conical surface, and the degree of damage.

[0003] Currently, the traditional method of grinding with a drill bit and sandpaper is commonly used to repair faulty conduit fittings. First, sandpaper of the appropriate size is selected based on the damage and fixed onto a grinding tool. Then, the grinding tool is placed on the fitting to be ground. During grinding, the grinding tool is held in place by the drill bit and rotated, causing the sandpaper on both sides of the conical surface to move circumferentially, thus grinding the conical surface. Although the grinding tool can control the angle of the conical surface during this process, the pressure and whether the point of application is on the axis of the fitting still largely rely on the operator's experience. Therefore, achieving the desired conical angle and flatness using this method is extremely time-consuming and labor-intensive, often resulting in rework due to angle deviations and unsatisfactory flatness. The grinding process is greatly affected by human factors, making it impossible to guarantee consistent grinding quality, reducing the service life of subsequent parts. The skill level of the personnel has a significant impact on the efficiency and quality of part grinding. Utility Model Content

[0004] This application provides a device for grinding the outer conical surface of a pipe fitting, which can solve the technical problem in the prior art where the outer conical surface of the pipe fitting is subject to significant human factors, resulting in large errors in the conical angle and flatness of the ground outer conical surface. The technical solution is as follows:

[0005] A device for grinding the outer conical surface of a tube fitting, used for grinding the outer conical surface of a tube fitting, the device comprising: a grinding body, sandpaper, a sleeve and a bottom cover.

[0006] The grinding body includes a column, a connecting shaft at a first end, and an inner conical surface recessed into the column at a second end. The second end also has two paper-holding grooves extending axially along the column, with the bottoms of the grooves and the apex of the inner conical surface on the same plane. A guide plate is also provided at the second end of the column. Sandpaper is held in place within the inner conical surface through the paper-holding grooves. One end of a sleeve has a first internal thread, and the inner diameter of the sleeve is larger than the outer diameter of the guide plate. The bottom cover includes a bottom plate with a through hole in the center and a cylindrical portion extending from the edge of the through hole towards the sleeve. The outer surface of the cylindrical portion has a second external thread matching the first internal thread, and the inner surface of the cylindrical portion has a second internal thread matching the first external thread.

[0007] Optionally, the column has a raised ring protruding from the column; the pipe fitting outer conical surface grinding device further includes: a bearing, the inner ring of the bearing being interference-fitted with the raised ring, and the diameter of the outer ring of the bearing being equal to the diameter of the guide plate.

[0008] Optionally, the column is provided with a first pin hole, which is located between the convex ring and the card slot; the pipe fitting outer conical surface grinding device further includes: an annular dust cover and a connecting pin, the dust cover having a radial second pin hole, and the dust cover being connected to the column through the connecting pin.

[0009] Optionally, the pipe fitting outer conical surface grinding device has multiple grinding bodies, each grinding body having multiple inner conical surfaces, and the conical angles of the multiple inner conical surfaces are not equal.

[0010] Optionally, the pipe fitting outer conical surface grinding device has multiple bottom covers, and the diameters of the through holes on the multiple bottom covers are not equal.

[0011] Optionally, the ratio of the thickness of the guide plate to the diameter of the guide plate is greater than 1:3.

[0012] The beneficial effects of the technical solutions provided in this application include at least the following:

[0013] A device for grinding the outer conical surface of a pipe fitting includes a grinding body, sandpaper, a sleeve, and a bottom cover. When repairing the damaged outer conical surface of a pipe fitting, the bottom cover is first connected to the first external thread of the pipe fitting via a second internal thread. Then, the lower end of the sleeve is connected to the second external thread of the bottom cover via a first internal thread. This fixes the bottom cover and sleeve to the pipe fitting. Cut sandpaper is inserted into the inner conical surface of the grinding body through a card slot. The second end of the grinding body is then inserted into the sleeve from the end without a second internal thread until its inner conical surface contacts the outer conical surface of the pipe fitting. The connecting shaft of the first end of the grinding body is connected to a drill bit, which provides rotational driving force to the grinding body. By holding the drill bit and repeatedly pushing and pulling the grinding body inside the sleeve, the outer conical surface of the pipe fitting can be ground. A guide plate can slide relative to the inner wall of the sleeve, and the sleeve guides the grinding body. The grinding body and the pipe fitting maintain a high degree of coaxiality, resulting in a high-quality ground outer conical surface.

[0014] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a cross-sectional view of a pipe fitting;

[0017] Figure 2 This is an exploded view of the pipe fitting outer conical surface grinding device provided in the embodiments of this application;

[0018] Figure 3 This is a longitudinal sectional view of the pipe fitting outer conical surface grinding device provided in the embodiments of this application;

[0019] Figure 4 yes Figure 2 A three-dimensional schematic diagram of the grinding media;

[0020] Figure 5 yes Figure 2 A three-dimensional schematic diagram of the middle sleeve;

[0021] Figure 6 yes Figure 2 A 3D diagram of the midsole cover;

[0022] Figure 7 yes Figure 2 A three-dimensional schematic diagram of the dust cover plate;

[0023] Figure 8 yes Figure 2 A three-dimensional diagram of the connecting pin.

[0024] Explanation of reference numerals in the attached figures

[0025] 1-Pipe fitting; 101-Fitting tube body; 102-First external thread; 103-Outer conical surface; 2-Grinding body; 201-Connecting shaft; 202-Inner conical surface; 203-Paper groove; 204-Guide circular plate; 205-Convex ring; 206-First pin hole; 3-Sleeve; 301-First internal thread; 4-Bottom cover; 401-Bottom plate; 402-Through hole; 403-Cylinder section; 404-Second external thread; 405-Second internal thread; 5-Bearing; 6-Dustproof cover; 601-Second pin hole; 7-Connecting pin. Detailed Implementation

[0026] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0027] In this disclosure, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the relative positions of the corresponding components in the direction of gravity when they are in use, and "inner" and "outer" refer to their relative positions to the contours of the corresponding components themselves. Furthermore, the terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or importance implications. In the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements.

[0028] refer to Figure 1 As shown, the nozzle 1 includes a nozzle body 101, the outer surface of which has a first external thread 102, and the outlet end of which has an external conical surface 103.

[0029] According to the embodiments of this application, refer to Figures 2 to 8 As shown, a pipe fitting outer conical surface grinding device is provided for grinding the outer conical surface 103 of the pipe fitting 1 of the conduit. The pipe fitting outer conical surface grinding device includes: a grinding body 2, sandpaper, a sleeve 3 and a bottom cover 4.

[0030] Among them, reference Figure 4As shown, the grinding body 2 includes a column. A connecting shaft 201 is provided at the first end of the column, and an inner conical surface 202 recessed into the column is provided at the second end. The second end also has two paper-holding grooves 203 extending axially along the column. The bottoms of the two paper-holding grooves 203 are on the same plane as the apex of the conical surface 202. A guide plate 204 is also provided at the second end of the column. Sandpaper is held in place within the inner conical surface 202 through the paper-holding grooves 203.

[0031] refer to Figure 5 As shown, one end of the sleeve 3 has a first internal thread 301, and the inner diameter of the sleeve 3 is larger than the outer diameter of the guide plate 204.

[0032] refer to Figure 6 As shown, the bottom cover 4 includes a bottom plate 401, the bottom plate 401 has a through hole 402 in the middle, and a cylindrical portion 403 extending along the edge of the through hole 402 toward the sleeve 3. The outer surface of the cylindrical portion 403 has a second external thread 404 that matches the first internal thread 301; the inner surface of the cylindrical portion 403 has a second internal thread 405 that matches the first external thread 102.

[0033] In the above embodiments, the pipe fitting 1 is generally installed on the guide tube. When it is necessary to repair the outer conical surface 103 of the damaged pipe fitting 1, the bottom cover 4 is first connected to the first external thread 102 of the pipe fitting 1 through the second internal thread 405, and then the lower end of the sleeve 3 is connected to the second external thread 404 of the bottom cover 4 through the first internal thread 301. In this way, the bottom cover 4 and the sleeve 3 are fixed on the pipe fitting 1. The cut sandpaper is inserted into the inner conical surface 202 of the grinding body 2 through the paper slot 203, and then the second end of the grinding body 2 is inserted into the sleeve 3 from the end of the sleeve 3 without the second internal thread 405 until the inner conical surface 202 of the second end contacts the outer conical surface 103 of the pipe fitting 1. The connecting shaft 201 of the first end of the grinding body 2 is connected to the drill bit. The drill bit can provide rotational driving force to the grinding body 2. By holding the drill bit and pushing and pulling the grinding body 2 back and forth inside the sleeve 3, the outer conical surface 103 of the pipe fitting 1 can be polished. Because the guide plate 204 and the inner wall of the sleeve 3 can slide relative to each other, the sleeve 3 can guide the grinding body 2, and the grinding body 2 and the pipe fitting 1 maintain a high degree of coaxiality. Therefore, the quality of the ground outer conical surface 103 is high. The pipe fitting outer conical surface grinding device of this application has the characteristics of saving time and labor, being less affected by human factors, and having high consistency in grinding quality.

[0034] According to the embodiments of this application, refer to Figure 4 As shown, the column has a raised ring 205 protruding from the column.

[0035] refer to Figure 2 and Figure 7As shown, the pipe fitting outer conical surface grinding device further includes a bearing 5, the inner ring of which is interference-fitted with the convex ring 205, and the diameter of the outer ring of the bearing 5 is equal to the diameter of the guide plate 204. By mounting the bearing 5 on the cylinder, and ensuring that the outer ring diameter of the bearing 5 is equal to the diameter of the guide plate 204, when the grinding body 2 rotates inside the sleeve 3, even if the grinding body 2 is slightly tilted, the outer ring of the bearing 5 contacts the inner wall of the sleeve 3, converting the sliding friction between the inner wall of the sleeve 3 and the guide plate 204 into rolling friction, thereby greatly reducing the friction between the sleeve 3 and the grinding body 2.

[0036] According to the embodiments of this application, refer to Figure 4 and Figure 7 As shown, the column is provided with a first pin hole 206, which is located between the convex ring 205 and the paper slot 203;

[0037] refer to Figure 2 , Figure 7 and Figure 8 As shown, the pipe fitting outer conical surface grinding device further includes: an annular dust cover plate 6 and a connecting pin 7. The dust cover plate 6 has a radial second pin hole 601, and the dust cover plate 6 is connected to the column body through the connecting pin 7. In this way, during the grinding process, the dust cover plate 6 can prevent grinding debris from entering the bearing 5, thereby extending the service life of the bearing 5.

[0038] In order to make the pipe fitting outer conical surface grinding device applicable to pipe fittings 1 with different outer conical surface angles 103, the pipe fitting outer conical surface grinding device has multiple grinding bodies 2, and the multiple grinding bodies 2 have multiple inner conical surfaces 202, and the conical surface angles of the multiple inner conical surfaces 202 are not equal.

[0039] Similarly, in order to make the pipe fitting outer conical surface grinding device suitable for pipe fittings 1 of different diameters, the pipe fitting outer conical surface grinding device has multiple bottom covers 4, and the diameters of the through holes 402 on the multiple bottom covers 4 are not equal.

[0040] To improve guiding accuracy, the ratio of the thickness to the diameter of the guide circular plate 204 is greater than 1:3.

[0041] The following describes the implementation principle of the pipe fitting external conical surface grinding device of this application, with specific usage steps as an example:

[0042] Step 1: Select a suitable bottom cover 4 according to the size of the damaged pipe fitting 1, screw the bottom cover 4 into the first external thread 102 of the cleaned pipe fitting 1 and fix it.

[0043] Step 2: Connect the bottom end of sleeve 3 to the bottom cover 4 with threads to ensure that the pipe fitting 1, bottom cover 4 and sleeve 3 are not loose;

[0044] Step 3: Determine the repair depth according to the degree of damage to the pipe fitting 1, select sandpaper of appropriate size, cut it to the appropriate size, fold it in half and place it in the card slot 203, open the sandpaper from the middle and lay it completely flat in the inner conical surface 202 of the grinding body 2;

[0045] Step 4: Connect the connecting shaft 201 at the end of the grinding body 2 with bearing 5 to the drill bit, and slowly insert the grinding body 2 into the sleeve 3 to ensure that the inner conical surface 202 of the grinding body 2 contacts the outer conical surface 103 of the pipe fitting 1.

[0046] Step 5: Start the drill bit, adjust the drill bit speed to a suitable state, hold the drill bit with your right hand and press the nozzle with your left hand, coordinate the two hands to make a pulling motion in a cycle to complete the grinding of nozzle 1.

[0047] The pipe fitting external conical surface grinding device of this application has the following beneficial effects: 1. One end of the sleeve is threaded to the bottom cover, so that the sleeve axis coincides with the center of the pipe fitting, ensuring that the grinding fixture is always tangentially aligned with the conical surface of the pipe fitting, thus guaranteeing grinding accuracy. 2. The bottom cover is available in multiple specifications, allowing for the grinding of multiple specifications of pipe fittings with a single grinding fixture by simply changing the bottom cover. 3. The bearing, as a component between the sleeve and the grinding body, reduces the clearance between the two, stabilizes the operation of the grinding fixture, and greatly reduces the frictional resistance between them, thereby improving grinding efficiency.

[0048] The pipe fitting outer conical surface grinding device of this application adopts a threaded fixing method for connection, which makes its overall structure more stable, making grinding more efficient, safer and less labor-intensive. Its accuracy has also been greatly improved. According to statistics, after using this tooling, the first-time grinding pass rate has increased from the original 30% to the current 90%. The quality of the ground pipe fittings is significantly improved, the size is uniform, and the operation is simple, convenient and time-saving.

[0049] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0050] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0051] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A device for grinding the outer conical surface of a pipe fitting, used for grinding the outer conical surface (103) of the pipe fitting (1) of a conduit, characterized in that, The pipe fitting (1) includes a fitting body (101), the outer surface of which has a first external thread (102), and the outlet end of which has an external conical surface (103). The pipe fitting external conical surface grinding device includes: The grinding body (2) includes a column. A connecting shaft (201) is provided at the first end of the column, and an inner conical surface (202) recessed into the column is provided at the second end. The second end is also provided with two paper slots (203) extending along the axial direction of the column. The bottom of the two paper slots (203) and the top of the conical surface of the inner conical surface (202) are on the same plane. The second end of the column is also provided with a guide plate (204). Sandpaper is held in place within the inner conical surface (202) by means of the paper slot (203); The sleeve (3) has a first internal thread (301) at one end, and the inner diameter of the sleeve (3) is larger than the outer diameter of the guide plate (204); And a bottom cover (4), the bottom cover (4) includes a bottom plate (401), the bottom plate (401) has a through hole (402) in the middle, and a cylindrical portion (403) extending along the edge of the through hole (402) toward the sleeve (3), the outer surface of the cylindrical portion (403) has a second external thread (404) that matches the first internal thread (301); the inner surface of the cylindrical portion (403) has a second internal thread (405) that matches the first external thread (102).

2. The pipe fitting outer conical surface grinding device according to claim 1, characterized in that, The column has a raised ring (205) protruding from the column; The pipe fitting outer conical surface grinding device also includes a bearing (5), the inner ring of the bearing (5) is interference-fitted with the convex ring (205), and the diameter of the outer ring of the bearing (5) is equal to the diameter of the guide plate (204).

3. The pipe fitting outer conical surface grinding device according to claim 2, characterized in that, The column is provided with a first pin hole (206), which is located between the convex ring (205) and the paper slot (203); The pipe fitting outer conical surface grinding device further includes: an annular dust cover (6) and a connecting pin (7), the dust cover (6) having a radial second pin hole (601), and the dust cover (6) being connected to the column body by the connecting pin (7).

4. The pipe fitting outer conical surface grinding device according to claim 1, characterized in that, The pipe fitting outer conical surface grinding device has multiple grinding bodies (2), and the multiple grinding bodies (2) have multiple inner conical surfaces (202), and the conical angles of the multiple inner conical surfaces (202) are not equal.

5. The pipe fitting external conical surface grinding device according to claim 1, characterized in that, The pipe fitting outer conical surface grinding device has multiple bottom covers (4), and the diameters of the through holes (402) on the multiple bottom covers (4) are not equal.

6. The pipe fitting outer conical surface grinding device according to claim 1, characterized in that, The ratio of the thickness of the guide plate (204) to the diameter of the guide plate (204) is greater than 1:3.

Images