Welding fixture for short pipe

Abstract

The utility model relates to a welding fixture for a short pipe. The welding fixture comprises a base component, a fixture component and a reducing component, the device has the advantages that the variable-diameter part is arranged in the penetrating hole of the clamp part, the hole diameter of the penetrating hole can be adjusted, and therefore the device can be suitable for pipe fittings with different pipe diameters, and the applicability of the whole device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of welding jigs, in particular to a welding jig for short pipes. Background Art

[0002] In the process of semiconductor processing, various process gases are usually required. However, the process gases need to be transported through pipelines, and different process gases require pipe fittings of different sizes and materials during transportation; in addition, during the actual assembly of process gas treatment equipment, welding and other operations need to be performed on the pipe fittings.

[0003] The Chinese invention patent discloses a pipe fitting processing and fixing jig (CN105437106A), which includes a fixed jig receiving groove, a jig receiving frame, and a pipe fitting fixing ring. The inner wall of the fixed jig receiving groove is provided with a jig receiving frame, and the top outer wall of the jig receiving frame is provided with a pipe fitting fixing ring. The bottom of the air pressure connection port is connected to the air pressure telescopic outer arm through an air pressure shunt pipeline. An air pressure telescopic inner arm is installed in the bottom inner cavity of the air pressure telescopic outer arm, and a pipe fitting fixing card slot is installed at the bottom of the air pressure telescopic inner arm.

[0004] However, the jigs in the prior art can only clamp pipe fittings of fixed specifications, that is, for welding of different pipe specifications, welding jigs corresponding to the pipe specifications need to be used; in addition, welding jigs of multiple specifications increase the use cost on the one hand, and on the other hand, it also takes a lot of time to change the welding jig each time.

[0005] Currently, for problems such as the inability to clamp pipe fittings of fixed specifications in the related art, no effective solutions have been proposed. Content of the Utility Model

[0006] The purpose of the utility model is to provide a welding jig for short pipes to solve problems such as the inability to clamp pipe fittings of fixed specifications in the related art.

[0007] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0008] The utility model provides a welding jig for short pipes, including:

[0009] A base component for installing components;

[0010] Two jig components are respectively arranged on opposite sides of the base component, and each jig component has an insertion hole for inserting a pipe fitting and realizing the butt joint of the pipe fittings;

[0011] Two variable-diameter components, the two variable-diameter components are respectively arranged in the insertion holes of the corresponding fixture components, and are used to adjust the aperture of the corresponding insertion hole and clamp the pipe fittings.

[0012] In some of the embodiments, the base component includes:

[0013] Two base parts, the two base parts are arranged symmetrically at intervals, and the sides of the two base parts are connected to each other, and are used to install the fixture component and the variable-diameter component;

[0014] Two upper cover parts, the two upper cover parts are arranged on the corresponding base parts, and any end of the upper cover part is rotatably connected to the corresponding base part, and is used to fix the corresponding fixture component;

[0015] A seal, the seal is arranged between the two base parts and is connected to the base parts, and is used to cooperate with the internal welder for sealing.

[0016] In some of the embodiments, the base component includes:

[0017] Several support parts, several support parts are respectively arranged on the corresponding base parts, and are used to detachably connect the fixture components;

[0018] Several positioning parts, several positioning parts are respectively arranged on the corresponding base parts, and fix the position of the fixture component on the base part.

[0019] In some of the embodiments, the base component further includes:

[0020] Several fixed foot parts, several fixed foot parts are arranged at the bottom of the corresponding base parts, and are used to fix the base parts.

[0021] In some of the embodiments, the base component further includes:

[0022] Two locking parts, the locking parts are respectively rotatably connected to the corresponding base parts, and are located at the other end of the base parts relative to the upper cover parts, and are used to fix the upper cover parts and the base parts to each other.

[0023] In some of the embodiments, the fixture component includes:

[0024] Two fixture parts, the two fixture parts are respectively arranged on opposite sides of the base component, and are detachably connected to the base component, and the fixture parts have insertion holes for the pipe fittings to be inserted;

[0025] Two connecting parts, the two connecting parts are respectively arranged on the corresponding fixture parts, and are used for the variable-diameter components to be respectively rotatably connected to the corresponding fixture parts.

[0026] In some of these embodiments, the fixture member further includes:

[0027] A plurality of insertion slots, which are opened in the fixture member and are arranged around the circumference of the fixture member for embedded connection with the diameter-changing member.

[0028] In some of these embodiments, the diameter-changing member includes:

[0029] Two rotating members, which are respectively arranged on the corresponding fixture components and are respectively rotatably connected to the corresponding fixture components;

[0030] A plurality of diameter-changing members, which are respectively arranged between the corresponding rotating members and the corresponding fixture components and are arranged around the circumference of the rotating members for adjusting the aperture of the insertion hole and clamping the pipe fitting under the drive of the rotating members.

[0031] In some of these embodiments, the diameter-changing member further includes:

[0032] A plurality of pin members, which are arranged on the diameter-changing member and are embedded and connected to the rotating member;

[0033] A plurality of insertion members, which are arranged on the diameter-changing member and are embedded and connected to the fixture component.

[0034] In some of these embodiments, the rotating member further includes:

[0035] A limiting slot, which is arranged on the rotating member for embedded connection with the fixture component;

[0036] A plurality of adjusting slots, which are opened in the rotating member and are arranged around the circumference of the rotating member for embedded connection with the diameter-changing member.

[0037] Adopting the above technical solutions, compared with the prior art, the present utility model has the following technical effects:

[0038] A welding fixture for short pipes of the present utility model can adjust the aperture of the insertion hole by arranging a diameter-changing member inside the insertion hole of the fixture component, so as to be applicable to pipe fittings of different diameters and improve the applicability of the overall device. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic diagram of a welding fixture according to an embodiment of the present utility model;

[0040] Figure 2 is a schematic diagram of a base component according to an embodiment of the present utility model;

[0041] Figure 3 It is a schematic diagram of a fixture component according to an embodiment of the present utility model;

[0042] Figure 4 It is a schematic diagram of a variable-diameter component according to an embodiment of the present utility model;

[0043] Figure 5 It is a schematic diagram of a variable-diameter part according to an embodiment of the present utility model.

[0044] The reference numerals therein are: 100, base component; 110, base part; 120, upper cover part; 130, seal; 140, support; 150, positioning part; 160, fixed foot part; 170, locking part;

[0045] 200, fixture component; 210, fixture part; 211, insertion hole; 212, insertion slot; 220, connecting part;

[0046] 300, variable-diameter component; 310, rotating part; 311, limiting groove; 312, adjusting groove; 320, variable-diameter part; 330, pin part; 340, insertion part. Detailed implementation manners

[0047] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be described and explained below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0048] Obviously, the accompanying drawings in the following description are only some examples or embodiments of the present application. For those of ordinary skill in the art, without making creative efforts, the present application can also be applied to other similar scenarios based on these drawings. In addition, it can also be understood that although the efforts made in this development process may be complex and lengthy, for those of ordinary skill in the art related to the content disclosed in the present application, some design, manufacturing or production changes made based on the technical content disclosed in the present application are only conventional technical means and should not be understood as the content disclosed in the present application being insufficient.

[0049] Reference to "embodiment" in this application means that the specific features, structures, or characteristics described in connection with the embodiment may be included in at least one embodiment of this application. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0050] Unless otherwise defined, the technical terms or scientific terms involved in this application shall have the ordinary meaning understood by those of ordinary skill in the technical field to which this application belongs. The words such as "a", "one", "a kind of", "the", etc. involved in this application do not indicate a limitation in quantity and may represent a singular or plural number. The terms "including", "comprising", "having" and any variations thereof involved in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may further include unlisted steps or units, or may further include other steps or units inherent to these processes, methods, products, or devices. The terms "connected", "coupled", etc. involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "plurality" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships may exist. For example, "A and / or B" may represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific order for the objects.

[0051] A schematic embodiment of the present utility model, as Figure 1 shown, a welding fixture for a short pipe includes a base member 100, two fixture members 200, and two reducing members 300. Among them, the base member 100 is used to mount components; the two fixture members 200 are respectively arranged on opposite sides of the base member 100, and each fixture member 200 has an insertion hole 211 for inserting a pipe fitting and realizing the butt joint of the pipe fittings; the two reducing members 300 are respectively arranged in the insertion holes 211 of the corresponding fixture members 200 for adjusting the aperture of the corresponding insertion hole 211 and clamping the pipe fitting.

[0052] As Figure 2As shown in the figure, the base member 100 includes two base parts 110, two upper cover parts 120 and a sealing member 130. Among them, the two base parts 110 are symmetrically arranged at intervals, and the sides of the two base parts 110 are connected to each other for installing the fixture member 200 and the diameter-changing member 300; the two upper cover parts 120 are arranged on the corresponding base parts 110, and any end of the upper cover part 120 is rotatably connected to the corresponding base part 110 for fixing the corresponding fixture member 200; the sealing member 130 is arranged between the two base parts 110 and is connected to the base parts 110 for cooperating with the internal welder for sealing.

[0053] Specifically, the base part 110 is arranged in a trapezoidal plate-like structure, and a first semi-circular hole is provided at the middle position of the top of the base part 110. The first semi-circular hole structure can avoid the pipe fittings passing through.

[0054] More specifically, the two ends in the length direction of the two base parts 110 are connected to each other by means of welding, bolt fixing or integral molding, etc., and the two base parts 110 form a trapezoidal body structure.

[0055] In some embodiments, the base part 110 includes, but is not limited to, a stainless steel plate.

[0056] Specifically, the upper cover part 120 is arranged in a trapezoidal plate-like structure. The first end of the upper cover part 120 is rotatably connected to any end in the length direction of the base part 110 through a rotating shaft. A second semi-circular hole is provided at the middle position of the upper cover part 120 and cooperates with the first semi-circular hole on the base part 110 to form a circular hole structure, so as to provide installation conditions for the fixture member 200. A groove-like structure is provided at the second end of the upper cover part 120, and the second end of the upper cover part 120 can be embedded and connected with the locking member 170, so as to realize the fixation between the upper cover part 120 and the base part 110.

[0057] It should be noted that the first end and the second end of the upper cover part 120 are respectively the two ends in its length direction.

[0058] More specifically, the two upper cover parts 120 are respectively rotatably connected to the corresponding base parts 110, and the rotational connection parts of the two upper cover parts 120 and the corresponding base parts 110 are arranged in central symmetry.

[0059] In some embodiments, the upper cover part 120 includes, but is not limited to, a stainless steel plate.

[0060] Specifically, the sealing member 130 is arranged between the two upper cover parts 120 and is located at the top of the two upper cover parts 120, and the sealing member 130 is detachably connected to the two upper cover parts 120 respectively by means of bolt fixing, etc.

[0061] In some embodiments, the sealing member 130 includes, but is not limited to, a stainless steel plate.

[0062] Furthermore, the base member 100 includes a plurality of support members 140 and a plurality of positioning members 150. Among them, the plurality of support members 140 are respectively disposed on the corresponding base members 110 for detachably connecting the fixture member 200; the plurality of positioning members 150 are respectively disposed on the corresponding base members 110 to fix the position of the fixture member 200 on the base member 110.

[0063] Specifically, the support member 140 is arranged in an L-shaped structure. The support member 140 is installed on the corresponding base member 110 by means of welding, bolt fixing or integral molding, etc., and is located at the bottom position on the side wall of the base member 110 for supporting the fixture member 200.

[0064] In some embodiments, the support member 140 includes, but is not limited to, a stainless steel buckle.

[0065] More specifically, the number of the support members 140 on each base member 110 is two, and the two support members 140 are arranged at intervals along the length direction of the base member 110.

[0066] In some embodiments, the number of the support members 140 on each base member 110 can also be one, three, etc., that is, the number of the support members 140 can be set according to actual needs and will not be limited too much here.

[0067] Specifically, the positioning member 150 is arranged in an L-shaped structure. The positioning member 150 is installed on the corresponding base member 110 by means of welding, bolt fixing or integral molding, etc., and is located at the top position on the side wall of the base member 110 for fixing the position of the fixture member 200 on the base member 110.

[0068] In some embodiments, the positioning member 150 includes, but is not limited to, a stainless steel buckle.

[0069] More specifically, the number of the positioning members 150 on each base member 110 is two, and the two positioning members 150 are symmetrically arranged on the base member 110.

[0070] In some embodiments, the number of the positioning members 150 on each base member 110 can also be four, six, etc., that is, the number of the positioning members 150 can be set according to actual needs and will not be limited too much here.

[0071] Furthermore, the base member 100 further includes a plurality of fixed foot members 160. Among them, the plurality of fixed foot members 160 are disposed at the bottom of the corresponding base member 110 for fixing the base member 110.

[0072] Specifically, the fixing feet 160 are arranged in a plate-like structure. The fixing feet 160 are installed on the bottom wall of the base member 110 by means of welding, bolt fixing or integral molding, etc. The fixing feet 160 are provided with through holes through which bolts can pass to fix the base member 110 on the processing machine table.

[0073] In some of these embodiments, the fixing feet 160 include, but are not limited to, stainless steel blocks.

[0074] More specifically, the number of the fixing feet 160 on each base member 110 is two, and the two fixing feet 160 are arranged at intervals along the length direction of the base member 110.

[0075] In some of these embodiments, the number of the fixing feet 160 on the base member 110 can also be one, three, etc., that is, the number of the fixing feet 160 on the base member 110 can be set according to actual needs and will not be limited too much here.

[0076] Furthermore, the base component 100 further includes two locking members 170. Among them, the locking members 170 are respectively rotatably connected to the corresponding base members 110 and are located at the other end of the base member 110 relative to the upper cover member 120 for fixing the upper cover member 120 and the base member 110 to each other.

[0077] Specifically, the locking members 170 are rotatably connected to the corresponding base members 110 and are located at the position of the second end of the base member 110 relative to the upper cover member 120.

[0078] It should be noted that the staff can rotate the locking members 170 so that the locking members 170 are inserted into the groove-like structure at the second end of the upper cover member 120, thereby realizing the fixed connection between the base member 110 and the upper cover member 120.

[0079] In some of these embodiments, the locking members 170 include, but are not limited to, pin posts and bolts.

[0080] In addition, the locking members 170 can also be passed through the upper cover member 120, and the ends of the locking members 170 can be bolt-connected to the base member 110, thereby realizing the fixed connection between the base member 110 and the upper cover member 120.

[0081] As Figure 3 shown, the fixture component 200 includes two fixture members 210 and two connecting members 220. Among them, the two fixture members 210 are respectively arranged on opposite sides of the base component 100 and are detachably connected to the base component 100, and the fixture members 210 are provided with insertion holes for inserting pipe fittings; the two connecting members 220 are respectively arranged on the corresponding fixture members 210 for the variable diameter components 300 to be respectively rotatably connected to the corresponding fixture members 210.

[0082] Specifically, the fixture member 210 is composed of a rectangular plate and a semi-circular plate. The rectangular plate and the semi-circular plate are integrally formed, and the rectangular plate is snap-connected to the support member 140 and the positioning member 150 to achieve a detachable connection between the fixture member 210 and the base member 110. In addition, the fixture member 210 further has an insertion hole 211, and the center of the circular hole is the same as the center of the semi-circular plate.

[0083] In some embodiments thereof, the fixture member 210 includes, but is not limited to, a stainless steel plate.

[0084] Specifically, the connecting member 220 has a semi-circular plate-like structure, and the cross-section of the connecting member 220 is an L-shaped structure. The connecting member 220 is connected to the fixture member 210 by means of welding, bolt fixing or integral forming, etc.

[0085] In some embodiments thereof, the connecting member 220 includes, but is not limited to, a stainless steel plate.

[0086] Furthermore, the fixture component 200 further includes a plurality of insertion slots 212. Among them, the plurality of insertion slots 212 are opened on the fixture member 210 and are arranged around the circumference of the fixture member 210 for embedding and connecting with the variable diameter component 300.

[0087] Specifically, the insertion slot 212 is arranged in a long strip structure, and the number of the first insertion slots 212 on the first fixture member 210 is 12, and the 12 first insertion slots 212 are arranged around the circumference of the fixture member 210. The insertion slot 212 can be embedded and connected with the variable diameter member 320 in the variable diameter component 300.

[0088] It should be noted that the number of the insertion slots 212 is adapted to the number of the variable diameter members 320 in the variable diameter component 300; it should be understood that the number of the insertion slots 212 is the same as the number of the variable diameter members 320 in the variable diameter component 300.

[0089] As Figure 4 and Figure 5 shown, the variable diameter component 300 includes two rotating members 310 and a plurality of variable diameter members 320. Among them, the two rotating members 310 are respectively arranged on the corresponding fixture components 200 and are respectively rotatably connected to the corresponding fixture components 200; the plurality of variable diameter members 320 are respectively arranged between the corresponding rotating members 310 and the corresponding fixture components 200 and are arranged around the circumference of the rotating member 310 for adjusting the aperture of the insertion hole 211 and clamping the pipe fitting under the drive of the rotating member 310.

[0090] Specifically, the rotating member 310 is composed of a disc and a ring. Among them, the edge of the disc is clamped inside the connecting member 220, and there is an avoidance hole at the center of the disc. The avoidance hole is arranged in a circular hole structure for avoiding the pipe fitting; the ring is integrally formed with the disc, and the centers of the disc and the ring are the same. The ring can be held by the staff, and the disc is driven to rotate by rotating the ring.

[0091] In some embodiments, the rotating member 310 includes, but is not limited to, a stainless steel circular plate.

[0092] Furthermore, the rotating member 310 further includes a limiting groove 311 and a plurality of adjusting grooves 312. Among them, the limiting groove 311 is arranged on the rotating member 310 for embedded connection with the fixture component 200; the plurality of adjusting grooves 312 are opened on the rotating member 310 and are arranged around the circumference of the rotating member 310 for embedded connection with the diameter-changing member 320.

[0093] Specifically, the limiting groove 311 is opened at the edge position of the disc, and the limiting groove 311 is opened along the circumference of the disc. The limiting groove 311 is embedded and connected with the connecting member 220, so that the rotating member 310 and the connecting member 220 are rotationally connected.

[0094] It should be noted that the number of the limiting grooves 311 on one rotating member 310 is 1.

[0095] Specifically, the adjusting groove 312 is arranged in an arc-shaped waist-shaped groove structure, and the number of the adjusting grooves 312 on the rotating member 310 is 12, and the 12 adjusting grooves 312 are arranged at intervals along the circumference of the rotating member 310.

[0096] It should be noted that the number of the adjusting grooves 312 is adapted to the number of the diameter-changing members 320; it should be understood that the number of the adjusting grooves 312 is the same as the number of the diameter-changing members 320.

[0097] Specifically, the diameter-changing member 320 is arranged in a triangular structure, and a plurality of diameter-changing members 320 are located between the rotating member 310 and the fixture member 210, and the diameter-changing member 320 is movably connected with the rotating member 310.

[0098] In some embodiments, the diameter-changing member 320 includes, but is not limited to, iris vanes.

[0099] More specifically, the number of the diameter-changing members 320 between the adjacent rotating member 310 and the fixture member 210 is 12, and the 12 diameter-changing members 320 are arranged around the circumference of the rotating member 310; in addition, the diameter-changing member 320 can reduce the aperture of the insertion hole 211 under the drive of the rotating member 310 and enable the diameter-changing member 320 to clamp the pipe fitting, so as to facilitate subsequent welding operations.

[0100] In some of these embodiments, the number of the diameter-changing members 320 between the adjacent rotating members 310 and the fixture members 210 is 10, 14, etc., that is, the number of the diameter-changing members 320 can be set according to actual requirements and will not be overly limited herein.

[0101] Furthermore, the diameter-changing component 300 further includes two limiting grooves 311. Wherein, the two limiting grooves 311 are respectively arranged on the corresponding rotating members 310 and are used for being embedded and connected with the corresponding fixture components 200.

[0102] Specifically, the limiting groove 311 is opened at the edge position of the disc, and the limiting groove 311 is opened along the circumferential direction of the disc. The limiting groove 311 is embedded and connected with the connecting member 220, so that the rotating member 310 and the connecting member 220 are rotationally connected.

[0103] Furthermore, the diameter-changing component 300 further includes a plurality of pin members 330 and a plurality of plug-in members 340. Wherein, the plurality of pin members 330 are arranged on the diameter-changing members 320 and are embedded and connected with the rotating members 310; the plurality of plug-in members 340 are arranged on the diameter-changing members 320 and are embedded and connected with the fixture components 200.

[0104] Specifically, the plurality of pin members 330 are installed on the corresponding diameter-changing members 320 by means of welding, bolt fixing or integral molding, etc., and the plurality of pin members 330 are movably connected with the rotating members 310.

[0105] In some of these embodiments, the pin members 330 include, but are not limited to, stainless steel cylinders.

[0106] It should be noted that the number of the pin members 330 is adapted to the number of the diameter-changing members 320; it should be understood that the number of the pin members 330 is the same as the number of the diameter-changing members 320.

[0107] Specifically, the plurality of plug-in members 340 are installed on the corresponding diameter-changing members 320 by means of welding, bolt fixing or integral molding, etc., and the plurality of plug-in members 340 are movably connected with the fixture members 210.

[0108] In some of these embodiments, the plug-in members 340 include, but are not limited to, stainless steel cylinders.

[0109] It should be noted that the number of the plug-in members 340 is adapted to the number of the diameter-changing members 320; it should be understood that the number of the plug-in members 340 is the same as the number of the diameter-changing members 320.

[0110] The usage method of this embodiment is as follows:

[0111] (Preparation work)

[0112] The staff rotates the upper cover member 120 upward, so that the circular hole structure formed by the upper cover member 120 and the base member 110 is opened, facilitating the installation of the fixture member 210;

[0113] Subsequently, the staff inserts the fixture member 210 into the corresponding support member 140 and positioning member 150 respectively to complete the installation of the fixture member 210;

[0114] After that, the staff flips the upper cover member 120 so that the upper cover member 120 abuts against the base member 110;

[0115] Finally, the staff rotates the locking member 170 so that the locking member 170 is inserted into the corresponding groove structure of the upper cover member 120 to fix the base member 110 and the upper cover member 120.

[0116] (Clamping operation)

[0117] The staff inserts the two pipe fittings to be welded into the insertion holes 211 on the corresponding fixture member 210 respectively, and makes the ends of the two pipe fittings butt against each other;

[0118] Subsequently, the staff rotates the corresponding rotating members 310 respectively so that the diameter-changing members 320 clamp the corresponding pipe fittings to fix the pipe fittings;

[0119] Finally, the staff uses the internal welder to weld the pipe fittings, and the welded pipe fittings can be taken out of the device.

[0120] The advantage of this embodiment is that by arranging a diameter-changing component inside the insertion hole of the fixture component, the aperture of the insertion hole can be adjusted, so that it can be applicable to pipe fittings of different diameters, improving the applicability of the overall device.

[0121] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0122] The above-described embodiments only represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A welding fixture for a short pipe, characterized in that: include: A base component, the base component is used to install components; Two clamp parts, the two clamp parts are respectively arranged on two opposite sides of the base part, and the clamp parts each have an insertion hole for inserting a pipe fitting and achieving the butt connection of the pipe fitting; Two diameter-changing components, the two diameter-changing components are respectively arranged at the corresponding insertion holes of the clamp component, and are used to adjust the apertures of the corresponding insertion holes and clamp the pipe fittings; Wherein, the variable diameter component comprises: Two rotating members, the two rotating members are respectively arranged on the corresponding clamp parts and are respectively rotatably connected with the corresponding clamp parts; A plurality of diameter reducing members are respectively arranged between the corresponding rotating members and the corresponding clamping members, and are arranged around the circumference of the rotating member, and are used to adjust the aperture of the insertion hole and clamp the pipe under the drive of the rotating member.

2. The welding fixture according to claim 1, characterized in that: The base component comprises: Two base members, the two base members are symmetrically arranged at intervals, and the sides of the two base members are connected to each other, and are used to install the clamp member and the diameter-changing member; Two upper cover members, the two upper cover members are arranged on the corresponding base members, and any end of the upper cover member is rotatably connected to the corresponding base member, so as to fix the corresponding clamp member; A sealing member is disposed between the two base members and connected to the base members, and is used for cooperating with an internal welder to perform sealing.

3. The welding fixture according to claim 2, characterized in that: The base component comprises: A plurality of support members, each of which is disposed on the corresponding base member and is used for detachably connecting the clamp member; A plurality of positioning members are respectively arranged on the corresponding base members to fix the position of the clamp member on the base member.

4. The welding fixture according to claim 2, characterized in that: The base component also includes: A plurality of fixing foot pieces are arranged at the bottom of the corresponding base piece and are used to fix the base piece.

5. The welding fixture according to claim 2, characterized in that: The base component also includes: Two locking members are rotatably connected to the corresponding base members respectively and are located on the other end of the base member relative to the upper cover member, and are used to fix the upper cover member and the base member to each other.

6. The welding fixture according to claim 1, characterized in that: The fixture components include: Two clamps, which are respectively arranged on opposite sides of the base component and are detachably connected to the base component, and the clamps have plug holes for inserting pipes; Two connecting members are respectively arranged on the corresponding clamp members, and are used for allowing the diameter-changing member to be rotatably connected to the corresponding clamp members.

7. The welding fixture according to claim 6, characterized in that: The fixture also includes: A plurality of inserting grooves are provided on the clamp member and are arranged around the circumference of the clamp member for being embedded and connected with the diameter-changing component.

8. The welding fixture according to claim 1, characterized in that: The variable diameter component also includes: A plurality of pin members, wherein the pin members are arranged on the diameter-changing member and are embedded and connected with the rotating member; A plurality of plug connectors are arranged on the reducer and embedded in the clamp component.

9. The welding fixture according to claim 1, characterized in that: The rotating member also includes: A limiting groove, which is arranged on the rotating member and is used for being embedded and connected with the clamp component; A plurality of adjusting grooves are provided on the rotating member and are arranged around the circumference of the rotating member for being embedded and connected with the diameter-changing member.

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