A pre-embedded sleeve D1 internal thread detection stopper

Abstract

A kind of embedded sleeve D1 internal thread detection stop rule, including handle and threaded body respectively arranged at two ends, wherein the threaded body is provided with external thread at the end away from handle, and the radius R for detecting embedded sleeve D1 internal thread working surface and contacting with internal thread at external thread is designed according to the middle point diameter of actual thread working surface of embedded sleeve D1, so that the thread designed has ideal pitch and tooth shape, to ensure that actual thread diameter of embedded sleeve D1 does not interfere during detection, and conforms to its thread working actual situation.

Description

Technical Field

[0001] This invention relates to a no-go gauge, specifically a no-go gauge for inspecting the internal thread of a pre-embedded sleeve D1. Background Technology

[0002] The D1 pre-embedded sleeve is a plastic sleeve pre-embedded in the fixing holes of the rail spikes on the sleeper. It requires good mechanical strength, heat resistance, wear resistance, and high rigidity, and boasts advantages such as simple and convenient construction and long service life. It can improve the durability, insulation, environmental protection level, and overall technical and economic indicators of the sleeper, and is one of the important components in the high-speed railway fastening system. Typically, after the D1 pre-embedded sleeve is injection molded, its internal thread needs to be inspected. Because its thread is not a standard thread, inspection is very difficult. Furthermore, there are no relevant design specifications for no-go gauges in railway standards. Currently, for standard threads, the purpose of the no-go gauge is to check the maximum limit size of the pitch diameter of the internal thread. However, the D1 pre-embedded sleeve has a special thread profile; according to the definition of pitch diameter, its pitch diameter is not on the working surface of the thread. Therefore, the no-go gauge designed in this way is of little practical significance. Consequently, there is currently a lack of no-go gauge inspection tools for the internal thread of the D1 pre-embedded sleeve. Although there are tools for testing the pre-embedded sleeve D1, such as the utility model patent with application number CN202121557584.4 entitled "Pull-out force testing device for pre-embedded sleeve D1 of high-speed railway CRTSIII type track slab", the invention application with application number CN202110617705.8 entitled "A pre-embedded sleeve D1 verticality testing device", and the utility model patent with application number CN201120026870.8 entitled "Center distance testing gauge for pre-embedded sleeve D1 of ballastless track slab", none of them are for testing the internal thread of the pre-embedded sleeve D1. Summary of the Invention

[0003] This invention addresses the problem that there is currently no stop gauge for inspecting the internal thread of non-standard threaded pre-embedded sleeves D1. It proposes a stop gauge for inspecting the internal thread of pre-embedded sleeves D1, which can be used to inspect the internal thread of pre-embedded sleeves D1 and control their product quality.

[0004] The technical means adopted by this invention to solve the above problems is as follows: a no-go gauge for detecting the internal thread of a pre-embedded sleeve D1, comprising a handle and a threaded body respectively disposed at both ends, wherein the end of the threaded body away from the handle is provided with an external thread, and the radius R of the working surface of the external thread used for detecting the internal thread of the pre-embedded sleeve D1 and in contact with the internal thread matches the radius r of the working surface of the internal thread of the pre-embedded sleeve D1, where r = (r1 + r2) / 2, and r1 and r2 are the crest radius and root radius of the internal thread of the pre-embedded sleeve D1, respectively. The no-go gauge is designed according to the diameter of the midpoint of the actual working surface of the thread of the pre-embedded sleeve D1, so that the designed thread has an ideal pitch and tooth profile, ensuring that there is no interference with the major and minor diameters of the actual thread of the pre-embedded sleeve D1 during detection, and conforming to its actual working conditions.

[0005] Furthermore, an indicator hole is provided on the outer wall of the threaded body at the end away from its external thread. The indicator hole is a through hole. A guide line is provided on the circumferential direction of the outer wall. The guide line is adjacent to or connected to the indicator hole, and the distance between the side wall of the guide line near the handle end and the handle is greater than the distance between the end of the indicator hole near the handle end and the handle. A movable component is provided inside the indicator hole, which can move along the length of the threaded body. The movable component includes an indicator piece. When the movable component moves inside the indicator hole, the indicator piece can move closer to or away from the guide line. When using a no-go gauge to inspect the embedded sleeve D1, the indicator piece is moved to the end of the indicator hole near the external thread. Then, the external thread of the no-go gauge threaded body is screwed into the embedded sleeve D1. If it cannot be screwed in and the indicator piece is located between the guide line and the external thread, the no-go gauge inspection of the internal thread of the embedded sleeve D1 is qualified. If it cannot be screwed in and the indicator piece is located between the guide line and the handle, the no-go gauge inspection of the internal thread of the embedded sleeve D1 is unqualified.

[0006] Furthermore, the guide lines can be indicator grooves, raised structures, or color-coded lines to facilitate viewing the position of the indicator piece.

[0007] Furthermore, the indicator groove or raised structure is painted a different color than other parts of the threaded body.

[0008] Furthermore, the indicator sheet is colored.

[0009] Furthermore, the threaded body has an internal mounting hole at the end furthest from its external thread, and the indicator hole communicates with the mounting hole; the movable assembly also includes a positioning bolt, which is detachably connected to the indicator piece at one end of its connector. The positioning bolt moves within the mounting hole to prevent the indicator piece from falling out of the indicator hole.

[0010] Furthermore, the moving assembly also includes a spring sleeved on the outside of the positioning bolt. The spring provides cushioning force, making the moving assembly move more smoothly, and eliminating the need for additional adjustment of the indicator position during the detection process.

[0011] Furthermore, the movable assembly also includes a locating nut, which secures the spring to the outer periphery of the locating bolt. This makes the movable assembly a single unit, facilitating its use.

[0012] Furthermore, a sleeve is provided at one end of the handle, and the end of the threaded body away from its external thread is fitted into the sleeve.

[0013] Furthermore, the handle side wall is provided with a stopper rod hole one, which communicates with the sleeve; the threaded body is provided with a stopper rod hole two on the side wall away from its external thread. After the threaded body is assembled into the handle sleeve, a stopper rod passes through the stopper rod hole one and the stopper rod hole two to fix the position of the handle and the threaded body.

[0014] Furthermore, the stop gauge also includes a spring plug, one end of which is provided with a positioning groove, and the width of the positioning groove is greater than the maximum outer diameter of the spring.

[0015] Furthermore, the maximum outer diameter of the spring plug at one end of the locating groove is smaller than the inner diameter of the threaded body mounting hole. During testing, after the moving component is assembled into the mounting hole, the locating groove end of the spring plug is also assembled into the mounting hole, and the spring plug provides a pushing force to the spring.

[0016] Furthermore, the maximum outer diameter of the spring plug is smaller than the inner diameter of the handle sleeve hole, and the spring plug has a mounting hole on the broken wall away from the positioning groove, through which the spring plug is fixed in the handle.

[0017] Furthermore, the end of the positioning bolt away from its connector is provided with a clearance groove.

[0018] Furthermore, the external thread of the threaded body is not a full thread.

[0019] Furthermore, the external thread of the threaded body is a truncated tooth profile.

[0020] The beneficial effects of this invention are:

[0021] 1. This invention uses the diameter of the midpoint of the actual working surface of the pre-embedded sleeve D1 as the design basis for the no-go gauge size, which conforms to the actual working conditions of the thread and can detect the internal thread of the pre-embedded sleeve D1. It proposes a brand-new method for detecting the no-go gauge of the internal thread of the pre-embedded sleeve D1.

[0022] 2. The present invention uses a movable component that can move within the threaded body, in conjunction with the change in the relative position between the indicator plate and the guide line, to determine whether the internal thread of the pre-embedded sleeve D1 is qualified without separating the stop gauge and the pre-embedded sleeve D1.

[0023] 3. This invention uses color-coded indicators and guide lines to make it easy to visually determine whether the internal thread of the pre-embedded sleeve D1 is qualified. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the pre-embedded sleeve D1 structure of the present invention;

[0025] Figure 2 for Figure 1 Cross-sectional view;

[0026] Figure 3 for Figure 1 Internal thread dimension diagram;

[0027] Figure 3-1 Schematic diagram for designing the dimensions of the go / no-go gauge;

[0028] Figure 4 This is a schematic diagram of the external thread dimensions of the stop gauge in Example 1;

[0029] Figure 5 This is a schematic diagram of the pre-embedded sleeve D1 for the stop gauge inspection in Example 1;

[0030] Figure 6 This is a schematic diagram of the stop gauge structure in Example 1;

[0031] Figure 7 for Figure 6 A schematic diagram of the structure after removing the handle;

[0032] Figure 8 for Figure 6 Schematic diagram of the structure after removing the threaded body;

[0033] Figure 9 for Figure 6 Explosion diagram;

[0034] Figure 10 for Figure 8 A schematic diagram of the structure after removing the handle;

[0035] Figure 11 This is a schematic diagram of the structure after the spring is assembled with the positioning bolt in Example 1;

[0036] Figure 12 This is a schematic diagram of the handle structure in Embodiment 1;

[0037] Figure 13 This is a schematic diagram of the spring plug structure in Example 1;

[0038] Figure 14 This is a schematic diagram of the positioning bolt and positioning nut structure in Example 1;

[0039] Figure 15 This is a schematic diagram of the indicator sheet structure in Embodiment 1;

[0040] Figure 16 This is a schematic diagram of the threaded body structure in Example 1;

[0041] Figure 17 This is a schematic diagram of the stop gauge structure in Example 2;

[0042] In the diagram: 1. Handle, 11. Plug hole one, 12. Sleeve hole, 2. Spring plug, 21. Mounting hole, 22. Positioning groove, 3. Plug rod, 4. Moving component, 41. Spring, 42. Positioning bolt, 421. Clearance groove, 422. Connector, 43. Indicator plate, 431. Connecting hole, 44. Positioning nut, 5. Threaded body, 51. Assembly hole, 52. Plug hole two, 53. Indicator hole, 54. Indicator groove, 55. External thread, 100. Embedded sleeve D1. Detailed Implementation

[0043] The present invention will be further described below in conjunction with the accompanying drawings. Among them, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams rather than physical diagrams, and should not be construed as a limitation on this patent; in order to better illustrate the embodiments of the present invention, some components in the accompanying drawings will be omitted, enlarged or reduced, which does not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0044] The embedded casing D1 100 for detection in the present invention is as Figure 1 and Figure 2 shown, having a non-standard internal thread, and the shape of its internal thread teeth is as Figure 3 shown, where r1 is the radius of the top of the internal thread tooth (i.e., the minor diameter), r2 is the radius of the bottom of the internal thread tooth (i.e., the major diameter). In the following embodiments, according to Figure 3-1 the design principle of the go-no-go gauge and the radius r at the midpoint of the working surface of the internal thread of the embedded casing D1 100, the no-go gauge is designed, and r = (r1 + r2) / 2. Embodiment 1

[0045] This embodiment is a preferred embodiment. A no-go gauge for detecting the internal thread of the embedded casing D1 is as Figures 6-9 shown, including a handle 1, a spring plug 2, a plug rod 3, a spring 41, a positioning bolt 42, a positioning nut 44, an indicating piece 43 and a threaded body 5. At one end of the threaded body 5, there is an external thread 55, as Figure 4 shown. The radius R at the position where the external thread 55 is used to detect the working surface of the internal thread of the embedded casing D1 100 and contacts the internal thread is designed according to the radius r at the midpoint of the working surface of the internal thread of the embedded casing D1 100, so that the radius R of the external thread 55 matches the radius r of the internal thread. During detection, the position where the radius R of the external thread 55 is located contacts the position where the radius r of the internal thread is located to determine whether the internal thread is qualified. At the same time, the external thread 55 of the threaded body 55 adopts a truncated tooth profile to avoid or reduce the influence of the tooth profile angle error on the inspection. As Figure 4 shown, the designed top radius of the external thread 55 is R2, and the bottom radius is R1, where R2 < R2', R1 < R1', where R2' is the radius of the external thread 55 that theoretically matches the bottom radius r2 of the internal thread of the embedded casing D1 100, and R1' is the radius of the external thread 55 that theoretically matches the top radius r1 of the internal thread of the embedded casing D1 100. In addition. The external thread 55 also adopts a non-full thread, such as a four-and-a-half thread, to avoid or reduce the influence of the pitch error, especially the cumulative error, on the inspection.

[0046] As Figure 12 shown, at one end of the handle 1, there is a sleeve hole 12, and on the side wall, there is a plug rod hole one 11, and the plug rod hole one 11 is communicated with the sleeve hole 12, and preferably, the plug rod hole one 11 penetrates through both side walls of the sleeve hole 12 to become a through hole.

[0047] like Figure 13 As shown, a positioning groove 22 is provided at one end of the spring plug 2, and the width of the positioning groove 22 is greater than the width of the spring 41, so that the spring 41 can move within the positioning groove 22. A mounting hole 21 is provided at the end of the spring plug 2 away from the positioning groove 22. At this time, a screw hole can be provided at the end of the inner sleeve hole 12 of the handle 1, and the spring plug 2 can be fixed on the screw hole by passing a bolt through the mounting hole 21.

[0048] like Figure 10 As shown, the spring 41, positioning bolt 42, positioning nut 44, and indicator plate 43 constitute the moving assembly 4. Both the spring 41 and the positioning bolt 42 of the moving assembly 4 can extend into the positioning groove 22 of the spring plug 2 and move. Figure 15 As shown, the indicator piece 53 has an overall elongated structure, and a connecting hole 431 is provided in the middle of the indicator piece 53, as... Figure 14 As shown, the positioning bolt 42 has a connector 422 at one end and a clearance groove 421 at the other end. The indicator piece 43 and the positioning bolt 42 are connected as a whole through the connector 422 and the connecting hole 431. Figure 11 As shown, the positioning nut 44 sleeves the spring 41 around the positioning bolt 42. Alternatively, the positions of the connector 422 and the connecting hole 431 can be interchanged, with the connector 422 positioned on the indicator plate 43 and the connecting hole 431 on the positioning bolt 42. Furthermore, the connector 422 and the connecting hole 431 can be connected using a pin and pin hole structure, or other detachable connection methods such as threaded connections or snap-fit ​​connections.

[0049] like Figure 16 As shown, the threaded body 5 has an assembly hole 51 at the end away from the external thread 55, and an indicator hole 53 on its side wall, which communicates with the assembly hole 51. Preferably, the indicator hole 53 penetrates the two side walls of the assembly hole 51 to form a through hole. Viewed from the outside of the threaded body 5, the indicator hole 53 has a relatively slender shape. An indicator groove 54 is also provided on the outer circumferential side wall of the threaded body 5 as a guide line for judging whether it is qualified or not. In this embodiment, the indicator groove 54 is divided into two segments, and both ends of the two segments communicate with the indicator hole 53. Of course, only a small segment can be provided near the indicator hole 53 for easy viewing. The indicator groove 54 and the indicator piece 43 can be painted with a more conspicuous color, so that the relative position of the indicator groove 54 and the indicator piece 43 can be easily seen. Moreover, the distance between the end of the indicator hole 53 near the handle 1 and the handle 1 is less than the distance between the side wall of the indicator groove 54 near the handle 1 and the handle 1. In addition, a second plug rod hole 52 is provided on the side wall of the threaded body 5 away from the external thread 55. The second plug rod hole 52 is also connected to the assembly hole 51. Preferably, the second plug rod hole 52 also penetrates both sides of the assembly hole 51 to form a through hole. The indicator hole 53 and the indicator groove 54 are both located between the second plug rod hole 52 and the external thread 55.

[0050] The assembly method of the stop gauge in this embodiment is as follows: First, assemble the spring 41, the positioning bolt 42, and the positioning nut 44 into a whole. Then, insert the assembled whole into the assembly hole 51 from the end of the threaded body 5 and push it all the way to the indicator hole 53. Insert one end of the indicator piece 43 into the indicator hole 53. Connect the connector 422 and the connecting hole 431 into a whole at the indicator hole 53. After the spring plug 2 is installed on the handle 1, insert the end of the threaded body 5 away from the external thread 55 into the sleeve hole 12, so that the first plug hole 11 and the second plug hole 52 are located in the same position in the radial direction. Insert the plug rod 3 and fix the handle 1 and the threaded body 5. At this time, the plug rod 3 also passes through the positioning groove 22 of the spring plug 2. The clearance groove 421 of the positioning bolt 42 is used to avoid the plug rod 3.

[0051] Of course, the handle 1 and the threaded body 5 can also adopt other connection methods, such as threaded connection, snap-fit ​​connection, etc. In this case, the relief groove 421 on the positioning nut 42 can be cancelled, and even the spring plug 2 can be cancelled, or it can be left as is.

[0052] During testing, the assembled stop gauge's spring 41 pushes the indicator plate 43 to the end of the indicator hole 53 near the external thread 55. Holding the handle 1, the external thread 55 is screwed into the pre-embedded sleeve D1 100. Figure 5 As shown, if the indicator 43 is located at the indicator groove 54 or between the indicator groove 54 and the external thread 55 after it cannot be turned, the internal thread stop gauge of the pre-embedded sleeve D1 100 is qualified; if the indicator 43 is located between the indicator groove 54 and the handle 1 after it cannot be turned, the internal thread stop gauge of the pre-embedded sleeve D1 100 is unqualified. Example 2

[0053] In this embodiment, the handle 1 and the threaded body 5 can be an integral structure, the assembly hole 51 is directly opened at one end of the handle 1, and the spring plug 2 is installed as a stop at the opening of the assembly hole 51. Example 3

[0054] In this embodiment, the guide line that cooperates with the indicator piece 43 can be a raised structure located at the position of the indicator groove 54 in Embodiment 1. Of course, the raised structure can also be painted with a conspicuous color. Alternatively, the color of the surface can be directly painted at the position of the indicator groove 54 without any additional protruding or recessed structure.

[0055] The above embodiments are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the invention. Therefore, all equivalent technical solutions should also fall within the protection scope of the invention, which should be defined by the claims.

Claims

1. A no-go gauge for detecting the internal thread of a pre-embedded sleeve D1, comprising a handle and a threaded body respectively disposed at both ends, wherein the end of the threaded body furthest from the handle is provided with an external thread, characterized in that: The radius R of the working surface of the internal thread of the pre-embedded sleeve D1 used for testing and contacting the internal thread is matched with the working surface radius r of the internal thread of the pre-embedded sleeve D1, where r = (r1 + r2) / 2, and r1 and r2 are the crest radius and root radius of the internal thread of the pre-embedded sleeve D1, respectively. An indicator hole is provided on the outer wall of the threaded body at the end away from its external thread. The indicator hole is a through hole. A guide line is provided on the circumferential direction of the outer wall. The guide line is adjacent to the indicator hole or the guide line is connected to the indicator hole. The distance between the side wall of the guide line near the handle end and the handle is greater than the distance between the end of the indicator hole near the handle end and the handle. A movable component is provided in the indicator hole. The movable component includes an indicator piece. When the movable component moves in the indicator hole, the indicator piece can move closer to or away from the guide line.

2. The no-go gauge for inspecting the internal thread of the pre-embedded sleeve D1 as described in claim 1, characterized in that: The guide lines are either indicator grooves, raised structures, or colored marking lines.

3. The no-go gauge for detecting the internal thread of the pre-embedded sleeve D1 as described in claim 2, characterized in that: The indicator groove or raised structure is painted a different color than the rest of the thread body.

4. The no-go gauge for inspecting the internal thread of the pre-embedded sleeve D1 as described in claim 2, characterized in that: The indicator is colored.

5. The no-go gauge for inspecting the internal thread of the pre-embedded sleeve D1 as described in claim 1, characterized in that: The threaded body has an assembly hole at the end away from its external thread, and the indicator hole communicates with the assembly hole; the moving component also includes a positioning bolt, which is detachably connected to the indicator plate at one end of its connector.

6. The no-go gauge for inspecting the internal thread of the pre-embedded sleeve D1 as described in claim 5, characterized in that: The moving component also includes a spring that is sleeved on the outside of the positioning bolt.

7. The no-go gauge for inspecting the internal thread of the pre-embedded sleeve D1 as described in claim 6, characterized in that: The movable component also includes a positioning nut, which secures the spring to the outer periphery of the positioning bolt.

8. The no-go gauge for inspecting the internal thread of the pre-embedded sleeve D1 as described in claim 1, characterized in that: A sleeve is provided at one end of the handle, and the end of the threaded body away from its external thread is fitted into the sleeve.

9. The no-go gauge for detecting the internal thread of the pre-embedded sleeve D1 as described in claim 6, characterized in that: The stop gauge also includes a spring plug, one end of which is provided with a positioning groove, and the width of the positioning groove is greater than the maximum outer diameter of the spring.

Images