A welding fixture for multi-segment cylindrical parts

Abstract

The utility model discloses a kind of welding tool of multi-section cylindrical parts, and the gas bag in the inner support assembly mandrel supports the expansion petal of multiple insertion, makes expansion petal effectively support each section of multi-section cylindrical part, while being provided with two limit discs at the both ends of mandrel, mandrel is limited to limit disc, so as to limit disc is limited to multi-section cylindrical part, multi-section cylindrical part outside is limited by multiple split type clamps, to realize the stable welding of multi-section cylindrical part, can guarantee the coaxiality of each section cylindrical part in multi-section cylindrical part.

Description

Technical Field

[0001] This utility model belongs to the field of cylindrical workpiece welding technology, specifically relating to a welding fixture for multi-segment cylindrical parts. Background Technology

[0002] Multi-section cylindrical parts, such as Figure 6 As shown, during the butt welding process of multi-section cylindrical parts, it is necessary to ensure the alignment and coaxiality of each section, as well as the welding effect, to avoid deformation of the parts due to welding. Therefore, the following situations that affect product quality are likely to occur during actual operation: 1) The misalignment between the cylinders after welding is too large, which cannot meet the usage requirements and leads to scrap.

[0003] 2) Excessive deformation after welding, the roundness of the cylinder and the coaxiality between the cylinders do not meet the usage requirements.

[0004] 3) In the existing welding process, it is usually done by welding one section and then welding the next section. The positioning fixture is used again for each section welding. This method is not only time-consuming and labor-intensive, but also prone to causing parts to be scrapped due to the accumulation of errors from multiple clamping.

[0005] Therefore, a technical solution is needed to address issues such as welding deformation, severe misalignment, and excessive coaxiality during the welding process of multi-segment cylinders. Utility Model Content

[0006] The purpose of this utility model is to provide a welding fixture for multi-segment cylindrical parts. The air bladder in the inner support component mandrel supports multiple inserted expansion flaps, so that the expansion flaps effectively support each segment of the multi-segment cylindrical parts. At the same time, two limiting discs are set at both ends of the mandrel. The mandrel limits the limiting discs, thereby limiting the multi-segment cylindrical parts. The outer side of the multi-segment cylindrical parts is limited by multiple split clamps to achieve stable welding of the multi-segment cylindrical parts.

[0007] This utility model is achieved through the following technical solution: A welding fixture for a multi-segment cylindrical part includes an inner support assembly, an end limiting assembly, and an outer limiting assembly. The multi-segment cylindrical part is fixed together by spot welding. The multi-segment cylindrical part is sleeved on the inner support assembly. The end limiting assemblies are located at both ends of the multi-segment cylindrical part and limit its axial movement. The end limiting assemblies are sleeved on the inner support assembly and fixed by the inner support assembly. The outer limiting assemblies are sleeved on the outer surface of the multi-segment cylindrical part. The inner support assembly is used to support the interior of the multi-segment cylindrical part, and the outer limiting assemblies are used to prevent the multi-segment cylindrical part from deforming on the inner support assembly.

[0008] Preferably, the inner support assembly includes a core rod, a first plug, a second plug, and multiple expansion flap groups. The core rod has multiple sets of spaced-apart slide rails, each set of slide rails being circumferentially distributed on the same cross-section of the core rod. Each expansion flap group includes multiple independent expansion flaps, which are inserted into and cooperate with the slide rails. A driving component is provided inside the core rod, which is used to drive the expansion flaps to expand outward. The first plug and the second plug are respectively inserted into and connected to both ends of the core rod. The end limiting assembly is sleeved on the core rod.

[0009] Preferably, the driving component is an airbag, the core rod is provided with a vent hole, and the airbag is connected to the gas cylinder through the vent hole.

[0010] Preferably, stepped limiting protrusions are provided on the inner walls of both ends of the mandrel, and the limiting protrusions at both ends of the mandrel limit the first plug and the second plug respectively.

[0011] Preferably, the mandrel has an anti-rotation pin hole at one end of the first plug, the first plug has a threaded hole, and the first plug is connected to the mandrel by a threaded pin.

[0012] Preferably, the end limiting assembly includes two limiting discs, each limiting disc including an insertion portion and an abutment portion. The insertion portions of the two limiting discs are arranged opposite to each other, the insertion portions are inserted into the ends of the multi-segment cylindrical parts, and the abutment portions abut against the ends of the multi-segment cylindrical parts. The mandrel is provided with two spaced limiting pins at the positions of the two limiting discs, and each limiting disc is located between the two limiting pins at one end of the mandrel. The limiting disc is provided with a through hole for introducing welding shielding gas.

[0013] Preferably, the expansion valve includes an insertion part and a support part. The insertion part is inserted into and slidably connected to the slide rail. The support part is made of copper and has an arc-shaped surface. The support part cooperates with the inner wall of the multi-segment cylindrical part. The multi-segment cylindrical part is provided with multiple protrusions, and the support part is provided with corresponding clearance grooves.

[0014] Preferably, the support portion of the expansion valve is provided with an air passage, which extends through the surface of the support portion.

[0015] Preferably, the mandrel is provided with a positioning block, the positioning block is provided with a positioning hole, the multi-segment cylindrical part is provided with an insertion hole, and the multi-segment cylindrical part and the positioning block are connected by a positioning pin, so that the multi-segment cylindrical part and the mandrel can rotate synchronously.

[0016] Preferably, the outer limiting component includes multiple split clamps, and each split clamp is provided with a binding groove.

[0017] Compared with the prior art, this utility model has the following advantages and beneficial effects: 1) In this utility model, the air bladder in the inner support component core rod supports multiple inserted expansion petals, so that the expansion petals effectively support each segment of the multi-section cylindrical part. At the same time, two limiting discs are set at both ends of the core rod. The core rod limits the limiting discs, thereby limiting the limiting discs to the multi-section cylindrical part. The outer side of the multi-section cylindrical part is limited by multiple split clamps to achieve stable welding of the multi-section cylindrical part and ensure the coaxiality of each segment of the multi-section cylindrical part.

[0018] 2) In this utility model, the support part of the expansion valve is made of copper, which can better conduct heat. At the same time, an air channel is provided on the support part and a through hole is provided on the limiting plate. Welding protective gas can enter the multi-section cylindrical part through the through hole and reach the air channel. The air channel is located close to the welding position of the multi-section cylindrical part, so it can better protect the welding and improve the welding quality.

[0019] 3) In this utility model, a positioning block is provided on the mandrel, and a positioning hole is provided on the positioning block. An insertion hole is provided on the multi-section cylindrical part. The positioning pin is connected to the positioning block through the insertion hole. When the automatic welding machine drives the mandrel to rotate, the multi-section cylindrical part can rotate synchronously, which facilitates the circumferential welding operation of the multi-section cylindrical part. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the assembly structure of the multi-section cylindrical parts and welding fixtures in this utility model.

[0022] Figure 2 This is a schematic diagram of the structure of the core rod in this utility model.

[0023] Figure 3 This is a schematic diagram of the assembly structure of the end-position limiting component and the inner support component of this utility model.

[0024] Figure 4 This is a schematic diagram of the expansion valve structure in this utility model.

[0025] Figure 5 This is a schematic diagram of the structure of the first plug in this utility model.

[0026] Figure 6 This is a schematic diagram of the structure of the multi-segment cylindrical part in this utility model.

[0027] Wherein: 1-core rod, 11-slide rail, 12-vent hole, 13-anti-rotation pin hole, 14-limiting pin, 2-expansion flap, 21-insertion part, 22-support part, 221-air passage, 222-giveaway groove, 3-first plug, 31-threaded pin, 32-threaded hole, 4-second plug, 5-limiting plate, 51-insertion part, 52-abutment part, 53-through hole, 6-positioning block, 61-positioning pin, 7-split clamp. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0029] Example 1: A welding fixture for multi-segment cylindrical parts, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the assembly includes an inner support component, an end limiting component, and an outer limiting component. The multiple cylindrical parts are fixed together by spot welding. In this embodiment, the multiple cylindrical parts include five cylindrical parts. The multiple cylindrical parts are sleeved on the inner support component. The end limiting components are located at both ends of the multiple cylindrical parts and limit their axial movement. The end limiting components are sleeved on the inner support component and fixed by the inner support component. The outer limiting component is sleeved on the outer surface of the multiple cylindrical parts to prevent the multiple cylindrical parts from deforming on the inner support component. The inner support component is used to support the inside of the multiple cylindrical parts and also to prevent the multiple cylindrical parts from deforming. The internal support assembly includes a core rod 1, a first plug 3, a second plug 4, and five spaced-apart expansion flap groups. The core rod 1 is a hollow cylindrical metal part with multiple sets of spaced-apart slides 11 on it. Each set of slides 11 is circumferentially distributed on the same cross-section of the core rod 1, and the same set of slides 11 is spaced around the core rod 1 in a circle, all on the same cross-section. The expansion flap groups include six independent expansion flaps 2, which are inserted into the slides 11 and can slide outward along the slides 11. A driving component is provided inside the core rod 1 to drive the expansion flaps 2 to expand outward. After the expansion flaps 2 expand outward, they connect with the multiple cylindrical sections. The internal abutment supports the multi-segment cylindrical parts, ensuring structural stability. The end limiting component is also fitted onto the mandrel 1 to axially limit the multi-segment cylindrical parts at both ends. The first plug 3 and the second plug 4 are respectively inserted and connected to the two ends of the mandrel 1. The plugs are used to connect to an external automatic welding machine. After the multi-segment cylindrical parts are fixed on the mandrel 1, the mandrel 1 and the multi-segment cylindrical parts are placed on the external automatic welding machine. The first plug 3 is held by the three-jaw chuck of the automatic welding machine. The center point of the second plug 4 is provided with an abutment hole. The tailstock of the automatic welding machine abuts against the abutment hole of the second plug 4, fixing the mandrel 1 and the multi-segment cylindrical parts.

[0030] The driving component is an airbag. The core rod 1 is provided with a vent hole 12. The airbag is connected to the gas cylinder through the vent hole 12. The multi-section cylindrical parts are initially fixed on the core rod 1 by the end limiting component. Then the airbag is inflated, so that the airbag pushes up the multiple expansion valves 2 evenly. The expansion valves 2 abut against the inner surface of the multi-section cylindrical parts, supporting the inside of the multi-section cylindrical parts.

[0031] The inner walls at both ends of the mandrel 1 are provided with stepped limiting bosses, which limit the first plug 3 and the second plug 4 respectively. The first plug 3 and the second plug 4 are respectively inserted into and connected to the mandrel 1. At the same time, the end of the mandrel 1 located at the first plug 3 is provided with an anti-rotation pin hole 13, and the first plug 3 is provided with a threaded hole 32. The first plug 3 is connected to the mandrel 1 through a threaded pin 31. After the three-jaw chuck of the automatic welding machine clamps the first plug 3, it drives the mandrel 1 to rotate.

[0032] like Figure 3 and Figure 4As shown, the expansion valve 2 includes an insertion part 21 and a support part 22. The insertion part 21 is inserted into and slidably connected to the slide rail 11. The support part 22 is made of copper material. The copper material abuts against the inside of the multi-segment cylindrical part, which can better transfer heat and further avoid deformation of the multi-segment cylindrical part during welding. The surface of the support part 22 has an arc-shaped structure and the support part 22 cooperates with the inner wall of the multi-segment cylindrical part. Each cylindrical part in the multi-segment cylindrical part has multiple protrusions on its inner arm. The protrusions are located near the port position. The support part 22 is provided with a corresponding relief groove 222. The relief groove 222 cooperates with the protrusion to position the multi-segment cylindrical part. When the mandrel 1 rotates, the multi-segment cylindrical part can rotate with it. In addition, an air passage 221 is provided on the support part 22 of the expansion flap 2. The air passage 221 is provided through the surface of the support part 22. The air passage 221 is used to introduce welding shielding gas. The air passage 221 is connected to the weld in the multi-section cylindrical part. The air passage 221 is located directly below the weld. When the welding shielding gas enters the interior of the multi-section cylindrical part, it will stay at the air passage 221. With the protection of welding shielding gas, the welding effect of the weld is better.

[0033] Example 2: This embodiment, based on the above embodiment, further adds a positioning block 6, such as... Figure 3 As shown, a positioning block 6 is provided on the mandrel 1. The positioning block 6 is located in the middle of the mandrel 1 and between the two sets of expansion flaps. The positioning block 6 is connected to the mandrel 1 by bolts. The positioning block 6 is provided with positioning holes. The multi-section cylindrical parts are provided with insertion holes. The multi-section cylindrical parts are connected to the positioning block 6 by positioning pins 61, so that the multi-section cylindrical parts and the mandrel 1 can rotate synchronously, which facilitates rotational welding. The other parts of this embodiment are the same as those in the above embodiment, and will not be described again here.

[0034] Example 3: This embodiment, based on the above embodiment, further defines the end limiting component and the outer limiting component, such as... Figure 1 and Figure 3As shown, the end limiting assembly includes two limiting discs 5. Each limiting disc 5 includes an insertion part 51 and an abutment part 52. The insertion parts 51 of the two limiting discs 5 are arranged opposite to each other. The diameter of the insertion part 51 matches the inner diameter of the multi-segment cylindrical part. The insertion part 51 is inserted into the end of the multi-segment cylindrical part, and the abutment part 52 abuts against the end of the multi-segment cylindrical part. Two spaced limiting pins 14 are provided on the mandrel 1 at the positions of the two limiting discs 5. Each limiting disc 5 is located between the two limiting pins 14 at one end of the mandrel 1. Both limiting discs 5 are limited by the limiting pins 14. A through hole 53 is provided on the limiting disc 5. The through hole 53 is used to introduce welding shielding gas. The welding shielding gas can enter from one limiting disc 5 and exit from the other limiting disc 5. The outer limiting assembly includes multiple split clamps 7, each with a binding groove. The split clamps 7 are secured by binding straps, thereby limiting the movement of the multiple cylindrical parts. The split clamps 7 are positioned on the weld side of two adjacent cylindrical parts, and a total of six sets of split clamps 7 are provided on the outside of the multiple cylindrical parts. Other parts of this embodiment are the same as those in the above embodiment and will not be repeated here.

[0035] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", and "outer" used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to 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 utility model.

[0036] Furthermore, the use of terms such as "horizontal" or "vertical" in the description of this utility model does not imply that the component is required to be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0037] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A welding fixture for a multi-segment cylindrical part, characterized in that, The device includes an inner support assembly, an end limiting assembly, and an outer limiting assembly. Multiple cylindrical parts are fixed together by spot welding. The multiple cylindrical parts are sleeved on the inner support assembly. The end limiting assemblies are located at both ends of the multiple cylindrical parts and limit their axial movement. The end limiting assemblies are sleeved on the inner support assembly and fixed by it. The outer limiting assemblies are sleeved on the outer surface of the multiple cylindrical parts. The inner support assembly is used to support the interior of the multiple cylindrical parts, and the outer limiting assemblies are used to prevent the multiple cylindrical parts from deforming on the inner support assembly.

2. The welding fixture for the multi-segment cylindrical part as described in claim 1, characterized in that, The internal support assembly includes a core rod, a first plug, a second plug, and multiple expansion flap groups. The core rod has multiple sets of spaced-apart slide rails, each set of slide rails being circumferentially distributed on the same cross-section of the core rod. Each expansion flap group includes multiple independent expansion flaps, which are inserted into and cooperate with the slide rails. A driving component is provided inside the core rod, which is used to drive the expansion flaps to expand outward. The first plug and the second plug are respectively inserted into and connected to both ends of the core rod. The end limiting assembly is sleeved on the core rod.

3. The welding fixture for the multi-segment cylindrical part as described in claim 2, characterized in that, The driving component is an airbag, and the core rod is provided with a vent hole. The airbag is connected to the gas cylinder through the vent hole.

4. The welding fixture for the multi-segment cylindrical part as described in claim 2, characterized in that, The inner walls at both ends of the mandrel are provided with stepped limiting protrusions, which limit the first plug and the second plug respectively.

5. The welding fixture for the multi-segment cylindrical part as described in claim 2, characterized in that, The mandrel has an anti-rotation pin hole at one end of the first plug, and the first plug has a threaded hole. The first plug is connected to the mandrel by a threaded pin.

6. The welding fixture for the multi-segment cylindrical part as described in claim 2, characterized in that, The end limiting assembly includes two limiting discs, each limiting disc having an insertion part and an abutment part. The insertion parts of the two limiting discs are arranged opposite to each other. The insertion part is inserted into the end of the multi-segment cylindrical part, and the abutment part abuts against the end of the multi-segment cylindrical part. The mandrel has two spaced limiting pins at the positions of the two limiting discs. Each limiting disc is located between the two limiting pins at one end of the mandrel. The limiting disc has a through hole for introducing welding shielding gas.

7. The welding fixture for the multi-segment cylindrical part as described in claim 2, characterized in that, The expansion valve includes an insertion part and a support part. The insertion part is inserted into and slidably connected to the slide rail. The support part is made of copper and has an arc-shaped surface. The support part cooperates with the inner wall of the multi-segment cylindrical part. The multi-segment cylindrical part is provided with multiple protrusions, and the support part is provided with corresponding clearance grooves.

8. The welding fixture for the multi-segment cylindrical part as described in claim 7, characterized in that, An air passage is provided on the support portion of the expansion valve, and the air passage extends through the surface of the support portion.

9. The welding fixture for the multi-segment cylindrical part as described in claim 2, characterized in that, The mandrel is provided with a positioning block, the positioning block is provided with a positioning hole, and the multi-segment cylindrical part is provided with an insertion hole. The multi-segment cylindrical part and the positioning block are connected by a positioning pin, so that the multi-segment cylindrical part and the mandrel can rotate synchronously.

10. The welding fixture for the multi-segment cylindrical part as described in claim 1, characterized in that, The outer limiting component includes multiple split clamps, each with a binding groove.

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