A corner door closer

Abstract

The application discloses a mitered plug door clamp, which comprises a connecting piece provided with a cylindrical part, the cylindrical part is provided with an outer thread for connecting with the sealing inner thread of a mitered plug door; a positioning piece is connected with the connecting piece to abut against the connecting end of the locking nut of the mitered plug door; a clamping piece is arranged on the side of the positioning piece away from the connecting piece, and the rotating shaft of the clamping piece coincides with the rotating shaft of the connecting piece, and the clamping piece is used for being fixed on a lathe. The mitered plug door clamp is simple, rapid, convenient, reliable, accurate in positioning, can meet the coaxiality requirement in the outer thread machining process of the connecting end of the locking nut of the mitered plug door, can be mechanically repaired by using a thread turning tool, and the repair success rate, repair quality and repair efficiency of the mitered plug door are improved.

Description

Technical Field

[0001] This application belongs to the field of maintenance and repair technology of railway vehicle brake parts, and particularly relates to an angle plug clamp. Background Technology

[0002] During assembly, disassembly, and truck disassembly, factors such as squeezing, collision, and material properties can cause the external threads of the angle plug to have stuck wires, cold welds, bent or deformed thread tips, making it impossible to install the new locking nut.

[0003] In related technologies, angle plugs are repaired using die threading. However, due to the relatively soft hardness and low thermal conductivity of stainless steel, "rough threads" are easily generated during processing, resulting in a high scrap rate. Furthermore, the manual repair method using files and dies is not only inefficient but also fails to address issues such as deformation of the external threads, broken iron filings, "cold welding" between the thread teeth, and thread jamming.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] This application aims to at least partially solve the technical problems of high scrap rates in die-threading repair and low efficiency and incomplete repair using manual filing. To this end, this application provides an angle plug clamp.

[0006] This application provides an embodiment of a corner plug clamp, the corner plug clamp comprising:

[0007] The connector has a cylindrical portion, which has an external thread for connecting with the sealing internal thread of the angle plug.

[0008] The positioning element is connected to the connecting element to abut against the locking nut connection end of the angle plug.

[0009] A clamping member is disposed on the side of the positioning member away from the connecting member, and the rotation axis of the clamping member coincides with the rotation axis of the connecting member. The clamping member is used to fix the clamping member on the lathe.

[0010] In some embodiments, the connector, the positioning member, and the clamping member are an integral structure.

[0011] In some embodiments, the length of the connector is matched with the distance between the locking nut connection end and the sealing internal thread.

[0012] In some embodiments, the positioning member has a positioning portion that protrudes from the surface of the cylindrical portion, the positioning portion being used to abut against the locking nut connection end of the angle plug.

[0013] In some embodiments, the positioning part has a vertical positioning surface that is perpendicular to the connector and is in contact with the end face of the locking nut connection end.

[0014] In some embodiments, the positioning part has a sloping positioning surface that is inclined relative to the connector, and the sloping positioning surface is engaged with the inner chamfer of the locking nut connection end.

[0015] In some embodiments, the positioning element protrudes relative to the clamping element.

[0016] In some embodiments, the clamping member is cylindrical, and the surface of the clamping member is provided with an anti-slip portion.

[0017] In some embodiments, the clamping member is triangular prism-shaped and is fixed to the lathe by a three-jaw chuck.

[0018] In some embodiments, the clamping member is square column-shaped and is fixed to the lathe by a four-jaw chuck.

[0019] The embodiments of this application have at least the following beneficial effects:

[0020] The aforementioned angle plug clamp utilizes the sealing internal thread of the angle plug itself to connect with the clamp's connector, thus fixing the angle plug and the clamp together. The clamping component then secures the clamp to the lathe, ultimately fixing the irregular angle plug on the lathe. Simultaneously, since the rotation axis of the clamping component coincides with that of the connector, when the angle plug clamp is rotated on the lathe, the connector and clamping component rotate coaxially. This causes the locking nut connection end of the angle plug to rotate coaxially with the clamping component, enabling the external thread at the locking nut connection end to rotate coaxially with the clamping component. This facilitates the repair machining of the external thread at the locking nut connection end using a thread cutting tool. The clamping of this angle plug fixture between the angle plug and the lathe is simple, quick, convenient, and reliable, with accurate positioning. It can meet the coaxiality requirements during the machining of the external thread of the locking nut connection end of the angle plug, and can also be mechanically repaired using a thread cutting tool. The success rate, quality, and efficiency of angle plug repair are all improved. Attached Figure Description

[0021] 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the angle plug clamp in an embodiment of this application is shown;

[0023] Figure 2 A schematic diagram of the angle plug door in an embodiment of this application is shown;

[0024] Figure 3 A schematic diagram showing the usage state of the angle plug clamp in the embodiment of this application is shown.

[0025] Figure label:

[0026] 100. Angle plug clamp; 110. Connector; 111. Cylindrical part; 112. External thread; 120. Positioning part; 121. Positioning section; 122. Sloping positioning surface; 130. Clamping part; 200. Angle plug; 210. Plug body; 211. Locking nut connecting end; 212. External thread; 213. Sealing internal thread; 214. Sealing seat; 215. Sealing cap; 220. Ball core; 230. Dial pin; 240. Sleeve; 250. Handle; 260. Spring; 270. Sealing ring; 280. Sealing gasket; 290. Elastic ferrule; 300. Three-jaw chuck; 400. Locking nut. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0028] Furthermore, reference numerals and / or reference letters may be repeated in different examples in this application. Such repetition is for simplification and clarity purposes and does not in itself indicate a relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0029] This application is described below with reference to the accompanying drawings and specific embodiments:

[0030] This application provides an embodiment of a corner plug clamp, such as... Figures 1 to 3 As shown, the angle plug clamp 100 of this embodiment includes:

[0031] The connector 110 has a cylindrical part 111, which has an external thread 112 for connecting with the sealing internal thread 213 of the angle plug 200.

[0032] The positioning component 120 is connected to the connecting component 110 to abut against the locking nut connection end 211 of the angle plug 200;

[0033] A clamping member 130 is disposed on the side of the positioning member 120 away from the connecting member 110, and the rotation axis of the clamping member 130 coincides with the rotation axis of the connecting member 110. The clamping member 130 is used to fix the clamping member 130 on the lathe.

[0034] In this embodiment, the angle plug clamp 100 utilizes the sealing internal thread 213 of the angle plug 200 itself to connect with the connector 110 of the angle plug clamp 100, thereby fixing the angle plug 200 and the angle plug clamp 100 together. Then, the clamping member 130 fixes the angle plug clamp 100 on the lathe, ultimately fixing the irregular angle plug 200 on the lathe. At the same time, since the rotation axis of the clamping member 130 coincides with the rotation axis of the connector 110, when the angle plug clamp 100 is rotated by the lathe, the connector 110 and the clamping member 130 rotate coaxially, thereby causing the locking nut connection end 211 of the angle plug 200 to rotate coaxially with the clamping member 130. This allows the external thread 212 of the locking nut connection end 211 to rotate coaxially with the clamping member 130, facilitating the repair machining of the external thread 212 of the locking nut connection end 211 using a thread cutting tool. The clamping of the angle plug fixture 100 with the angle plug 200 and the lathe is simple, quick, convenient and reliable, and the positioning is accurate. It can meet the coaxiality requirements of the external thread 212 of the locking nut connection end 211 of the angle plug 200 during machining, and can also be mechanically repaired using a thread cutting tool. The repair success rate, repair quality and repair efficiency of the angle plug 200 are all improved.

[0035] In this embodiment, the structure of the angle plug 200 is as follows: Figure 2As shown, the device includes a plug body 210, a sealing seat 214 in the axial through hole of the plug body 210, and a ball core 220 disposed in the sealing seat 214, so that the ball core 220 contacts the upper and lower ends of the sealing seat 214 to achieve sealing; a sealing cover 215 is provided on the sealing seat 214, and a pivot shaft 230 is provided in the space formed by the sealing seat 214 and the sealing cover 215 to connect with the ball core 220; the angle plug 200 is connected to the pivot shaft 230 through a handle 250, and a sleeve 240 and a spring 260 are provided to lock and open the angle plug 200; a sealing ring 270 or a sealing gasket 280 is provided between the sealing cover 215 and the pivot shaft 230, and between the sealing cover 215 and the plug body 210 to ensure sealing. One end of the axial through hole of the plug body 210 is a locking nut connection end 211, which has an external thread 212 for threaded connection with the locking nut 400. A sealing internal thread 213 is provided in the axial through hole of the plug body 210 for sealing connection with the main pipe. After the main pipe passes through the locking nut connection end 211 and enters the axial through hole to connect with the sealing internal thread 213, an elastic sleeve 290 is provided at the locking nut connection end 211 and the locking nut 400 presses the elastic sleeve on the locking nut connection end 211. The shock absorption effect of the elastic sleeve 290 protects the connection between the main pipe and the sealing internal thread 213 and prevents cracking from affecting the seal.

[0036] The angle cock 200 is a control valve for the air supply and cut-off between railway locomotives, between locomotives and cars, and between cars. Its handle 250 can be rotated 90° after being lifted to open and close the air passage. The angle cock 200 is installed at both ends of the main brake pipe of each car. When the train is running, the angle cock 200 is open, controlling the air supply passage of the braking system. When the train is stopped, the angle cock 200 is closed, interrupting the air supply passage of the train's braking system to facilitate car coupling, uncoupling, and maintenance. If the angle cock 200 leaks while the train is running, the train's braking force will weaken, endangering operational safety. Therefore, it is necessary to disassemble, inspect, and test the angle cock 200 regularly to prevent leaks. However, during the installation of the angle plug 200, due to the relatively soft hardness and low thermal conductivity of the stainless steel used to manufacture the angle plug 200 (approximately 1 / 3 that of carbon steel), the locking nut 400 generates heat due to friction during rotation during assembly. Uneven force or excessive tightening force can easily cause the external thread 212 of the locking nut connection end 211 to seize up. After removing the locking nut 400 for maintenance, the thread profile may appear flattened or deformed. During the disassembly of the angle plug 200, the deformed and broken debris from the locking nut 400, under the influence of frictional pressure and heat, can cause cold welding, forming "cold weld" points at the thread root. The filamentous debris adheres to the surface of the external thread 212 and does not fall off, preventing the locking nut 400 from being assembled. During cleaning and transportation, such as during shot blasting operations on trucks or collisions during the disassembly, maintenance, and transportation of the angle plug 200, the thread profile can also deform, preventing the locking nut 400 from being assembled.

[0037] Given that the external thread 212 at the locking nut connection end 211 of the angle plug 200 is prone to the aforementioned defects, causing the locking nut 400 to be unable to be assembled, it is necessary to repair the external thread 212 of the angle plug 200 in a timely manner. Repairing it on a lathe is an efficient and reasonable solution; however, due to the irregular shape of the angle plug 200, the lathe's three-jaw chuck 300 or four-jaw chuck cannot directly clamp the angle plug 200, meaning the angle plug 200 cannot be directly clamped on the lathe. This is the main reason why lathe repair of the angle plug 200 cannot be performed.

[0038] The angle plug clamp 100 proposed in this application, after the angle plug 200 is connected to the angle plug clamp 100, can be clamped on a lathe by the angle plug clamp 100. The clamping can meet the cutting force requirements. Then, the angle plug 200 and the angle plug clamp 100 can be rotated coaxially by the lathe. This means that the external thread 212 of the locking nut connection end 211 rotates coaxially with the angle plug clamp 100. Thus, the external thread 212 of the locking nut connection end 211 can be repaired by a thread cutting tool.

[0039] It is important to note that when repairing the external thread 212 of the locking nut connection end 211 using a thread cutting tool, the rotation direction of the angle plug clamp 100 is the direction that locks the threaded connection between the angle plug clamp 100 and the sealing internal thread 213 of the angle plug 200. This ensures a reliable connection between the angle plug clamp 100 and the angle plug 200 during repair processing.

[0040] In this embodiment, the connector 110 can be cylindrical in shape. At this time, one end of the connector 110 is equivalent to the cylindrical part 111. The external thread 112 can be provided on the cylindrical part 111 of the connector 110 so that the external thread 112 matches the internal thread 213 of the angle plug 200, thereby achieving a threaded connection with the internal thread 213.

[0041] In other embodiments, the connector 110 may also be of other structural types. For example, the body of the connector 110 may be in the shape of a square column, and a cylindrical portion 111 may be provided at one end of the square column connector 110, thereby providing an external thread 112 for connection.

[0042] As an alternative implementation method, such as Figure 1 As shown, the connector 110, the positioning member 120, and the clamping member 130 are an integral structure. In this embodiment, the copper makes the connector 110, the positioning member 120, and the clamping member 130 an integral structure, which can ensure the coaxiality and overall strength of the connector 110, the positioning member 120, and the clamping member 130 of the angle plug 200, and also eliminates the need for assembly, ensuring the convenience of connecting the angle plug clamp 100 and the angle plug 200.

[0043] As an alternative implementation method, such as Figure 3 As shown, the length of the connector 110 matches the distance between the locking nut connection end 211 and the sealing internal thread 213. In this embodiment, since there is a certain distance between the locking nut connection end 211 of the angle plug 200 and the sealing internal thread 213, the length of the connector 110 is matched with this distance, thereby ensuring that the connecting external thread 112 on the connector 110 can reach the sealing internal thread 213 of the angle plug 200 to achieve a threaded connection with the sealing internal thread 213.

[0044] As an alternative implementation method, such as Figure 1 and Figure 3As shown, the positioning member 120 has a positioning portion 121 that protrudes from the surface of the cylindrical portion 111. The positioning portion 121 is used to abut against the locking nut connection end 211 of the angle plug 200. In this embodiment, when the external thread 112 is threadedly connected to the sealing internal thread 213 of the angle plug 200, if the connection is not restricted, the external thread 112 may easily extend excessively into the radial through hole of the angle plug 200 and abut against the ball core 220, which may damage the sealing performance between the ball core 220 and the sealing seat 214. In this embodiment, the positioning portion 121, which protrudes from the surface of the cylindrical portion 111, prevents the positioning portion 121 from entering the radial through hole of the angle plug 200 and abutting against the locking nut connection end 211. This ensures that the external thread 112 stops extending immediately after connecting with the sealing internal thread 213, avoiding damage to the sealing performance between the ball core 220 and the sealing seat 214.

[0045] As an optional embodiment, the positioning part 121 has a vertical positioning surface that is perpendicular to the connector 110, and the vertical positioning surface is in contact with the end face of the locking nut connection end 211. In this embodiment, after the positioning part 121 is in contact with the end face of the locking nut connection end 211, it can prevent the connector 110 from continuing to penetrate into the radial through hole after being connected to the sealing internal thread 213.

[0046] As an alternative implementation method, such as Figure 1 and Figure 3 As shown, the positioning part 121 has a sloped positioning surface 122 inclined relative to the connector 110, and the sloped positioning surface 122 fits against the inner chamfer of the locking nut connection end 211. Generally, the locking nut connection end 211 of the angle plug 200 is provided with an inner chamfer so that sealing rings 270, sealing gaskets 280, and elastic sleeves 290, etc., can be provided at the inner chamfer to ensure sealing. In this embodiment, the positioning part 121 has a slope positioning surface 122 that matches the inner chamfer. When the connecting external thread 112 of the connector 110 is connected to the sealing internal thread 213 of the angle plug 200, the locking nut connection end 211 of the angle plug 200 is pulled toward the positioning part 120 by rotating the thread, so that the slope positioning surface 122 fits with the inner chamfer of the locking nut connection end 211 of the angle plug 200, thereby positioning and limiting the connection position of the connector 110 and the angle plug 200, so that the angle plug clamp 100 is accurately positioned and reliably clamped, and can ensure the coaxiality requirement during the processing of the external thread 212 of the angle plug 200.

[0047] In this embodiment, whether the positioning element 120 adopts a vertical positioning surface or a sloped positioning surface 122, the ultimate goal is to fit with the locking nut connection end 211. While achieving positioning, it can also ensure the coaxiality of the angle plug 200 and the angle plug clamp 100. Thus, when the angle plug clamp 100 is connected to the lathe and rotates, it ensures that the angle plug 200 and the rotation axis of the lathe remain coaxial.

[0048] In other embodiments, the positioning part 121 of the positioning member 120 may also be in other structural forms. For example, the positioning part 121 is a positioning post that protrudes relative to the surface of the cylindrical part 111. There may be one or more positioning posts, which abut against the locking nut connection end 211 of the angle plug 200 through the cylinder.

[0049] As an alternative implementation method, such as Figure 1 and Figure 3 As shown, the positioning member 120 protrudes relative to the clamping member 130. In this embodiment, by making the positioning part 121 protrude relative to the clamping member 130, the clamping position can be positioned by the positioning part 121 when the clamping member 130 is clamped on the lathe, thus determining the clamping position of the lathe on the clamping member 130. This avoids the clamping member 130 penetrating too deeply into the clamping position of the lathe, which would cause interference between the positioning part 121 and the lathe during rotation.

[0050] As an optional implementation, the clamping member 130 is cylindrical, and its surface is provided with an anti-slip portion. In this embodiment, by providing an anti-slip portion on the surface of the clamping member 130, it can be ensured that the lathe can clamp the clamping member 130, thereby preventing slippage between the angle plug clamp 100 and the lathe's clamping device when repairing the external thread 212 of the locking nut connection end 211 with a thread cutting tool.

[0051] As an optional implementation, the clamping member 130 is triangular prism-shaped and is fixed to the lathe by a three-jaw chuck 300. In this embodiment, the clamping member 130 is triangular prism-shaped, and correspondingly, the lathe's clamping device uses a three-jaw chuck 300. The three jaws of the three-jaw chuck 300 fit against the three faces of the triangular prism, ensuring that the three-jaw chuck 300 clamps the clamping member 130 tightly and preventing slippage between the angle plug clamp 100 and the lathe's clamping device.

[0052] In one optional implementation, the clamping member 130 is a square column, and the clamping member 130 is fixed to the lathe by a four-jaw chuck. In this embodiment, the clamping member 130 is square column-shaped, and correspondingly, the clamping device of the lathe adopts a four-jaw chuck. The four jaws of the four-jaw chuck fit against the four surfaces of the square column, ensuring that the four-jaw chuck clamps the clamping member 130 tightly and preventing slippage between the angle plug clamp 100 and the clamping device of the lathe.

[0053] The process of repairing the external thread 212 by clamping the angle plug 200 on a lathe using the angle plug clamp 100 is as follows:

[0054] like Figure 3 As shown, after connecting the angle plug clamp 100 and the angle plug 200 by threads, the clamping part 130 of the angle plug clamp 100 is clamped and fixed in the three-jaw chuck 300 / four-jaw chuck of the lathe. Using the lathe's small slide, the "dynamic tool setting method" is adopted to align the thread cutting tool with the root of the external thread 212 of the locking nut connection end 211 of the angle plug 200. The cold welding iron filings at the root of the thread and the bent and deformed thread profile are gradually removed. After completion, the thread go gauge and no-go gauge are used for inspection. After passing the inspection, the "fixed size method" can be used for batch processing.

[0055] The lathe can clamp the angle plug 200 using the angle plug clamp 100, ensuring accurate positioning, convenient clamping, and saving time and effort, effectively solving the clamping problem of stainless steel angle plug 200 on the lathe. Compared with manual repair using files and dies, it not only solves the deformation problem of the external thread 212, but also solves the problems of "cold welding" and wire jamming caused by broken iron filings at the root of the plug body thread 210. Work efficiency is increased by more than 5 times, repairing 200-300 stainless steel angle plugs 200 per month, saving 70,000-100,000 yuan in production costs. Compared with machining with dies on the tooling equipment used for plug repair, it overcomes the problem of stainless steel's relatively soft hardness and low thermal conductivity, which easily leads to "rough threads." The repair rate of the external thread 212 of the stainless steel angle plug 200 can be consistently maintained above 95%.

[0056] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0057] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0058] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0059] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0060] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0062] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0063] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A corner jamb clamp, characterized in that, The angle plug door comprises a plug door body and a ball core, an axial through hole of the plug door body is provided with a sealing seat, the ball core is arranged in the sealing seat to realize sealing contact between the ball core and upper and lower ends of the sealing seat, one end of the axial through hole of the plug door body is a locking nut connecting end, the locking nut connecting end is provided with external threads to realize threaded connection with a locking nut, the axial through hole of the plug door body is provided with a sealing internal thread, the sealing internal thread is used for sealing connection with a main pipe, the angle plug door clamp comprises: a connecting piece provided with a cylindrical part, the cylindrical part is provided with connecting external threads, the connecting external threads are connected with the sealing internal threads of the angle plug door to fix the angle plug door and the angle plug door clamp together; a positioning piece connected with the connecting piece to abut against the locking nut connecting end of the angle plug door; a clamping piece arranged on a side of the positioning piece away from the connecting piece, and a rotation axis of the clamping piece coincides with a rotation axis of the connecting piece, the clamping piece is used for being fixed on a lathe; the connecting piece, the positioning piece and the clamping piece are an integral structure; the positioning piece is provided with a positioning part protruding relative to a surface of the cylindrical part, the positioning part is used for abutting against the locking nut connecting end of the angle plug door to avoid abutment of the connecting external threads to the ball core of the angle plug door.

2. The mitered door clamp of claim 1, wherein, The length of the connecting piece and the distance between the locking nut connecting end and the sealing internal thread are matched.

3. The mitered door clamp of claim 1, wherein, The positioning part has a vertical positioning surface perpendicular to the connecting piece, and the vertical positioning surface is attached to an end surface of the locking nut connecting end.

4. The mitered door clamp of claim 1, wherein, The positioning part has an inclined slope positioning surface relative to the connecting piece, and the slope positioning surface is attached to an internal chamfer of the locking nut connecting end.

5. The mitered door clamp of claim 1, wherein, The positioning piece protrudes relative to the clamping piece.

6. A corner jamb fixture as claimed in any one of claims 1 to 5, wherein, The clamping piece is cylindrical, and a surface of the clamping piece is provided with an anti-skid part.

7. A corner jamb fixture as claimed in any one of claims 1 to 5, wherein, The clamping piece is triangular prism-shaped, and the clamping piece is fixed on the lathe through a three-jaw chuck.

8. A corner jamb fixture as claimed in any one of claims 1 to 5, wherein, The clamping piece is square column-shaped, and the clamping piece is fixed on the lathe through a four-jaw chuck.

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