Flange inner ring welding device

Abstract

The utility model relates to the field of forming equipment, in particular to a flange inner ring welding device which comprises a base, two vertical plates arranged at intervals are arranged on the base, a lower positioning assembly is arranged on the base, the lower positioning assembly comprises a lower positioning piece capable of reciprocating in the vertical direction, the lower positioning piece is located between the two vertical plates, and the lower positioning piece is located between the two vertical plates. A lower positioning surface and at least two lower positioning pins are arranged at the upper end of the lower positioning piece, side positioning assemblies are arranged at the opposite ends of the two vertical plates, the side positioning assemblies are located above the lower positioning assemblies, each side positioning assembly comprises a wedge block capable of performing lateral reciprocating motion, and a wedge surface is arranged at the far end of each wedge block; the wedge faces of the wedge blocks of the positioning assemblies on the two sides converge and extend downwards. A containing groove is formed in the far end of each wedge block, and a pressing claw capable of swinging is hinged to the interior of each containing groove.

Description

Technical Field

[0001] The utility model relates to the field of forming equipment, in particular to a flange inner ring welding device. Background Art

[0002] Automobile exhaust systems often include pipe fittings with flanges, which are used to dock with flanges of other pipe fittings or connect to the exhaust port of the engine. Conventional flange-to-pipe connections are achieved by welding, which is usually performed on a welding tool. After the existing welding tool positions the pipe fitting and the flange, it can only provide a welding groove for the outer ring at the joint between the flange and the pipe fitting, so as to perform welding operations on the outer ring of the flange and the pipe fitting. Since the current welding tool is provided with positioning and clamping devices, only outer ring welding can be achieved. During welding operations, the running trajectory of the welding gun is generally restricted, especially when a welding robot arm is used. The impact is more significant, and continuous operations cannot be performed along the weld bead, and intermittent operations are required, which not only significantly reduces the operating efficiency, but also discontinuous formation of the weld bead, and the continued part of the weld bead is also prone to welding defects. Summary of the invention

[0003] The purpose of the utility model is to provide a flange inner ring welding device in view of the deficiencies in the prior art. The device has a simple and compact structure, can quickly clamp pipe fittings with flanges, can ensure welding accuracy, is convenient for welding operations of the inner hole welds of pipe fittings, and can facilitate automated production.

[0004] The purpose of the utility model is achieved as follows: A flange inner ring welding device comprises a base, two vertical plates arranged at intervals are arranged on the base, a lower positioning assembly is arranged on the base, and the lower positioning assembly comprises a lower positioning member that can reciprocate in the vertical direction, the lower positioning member is located between the two vertical plates, and a lower positioning surface and at least two lower positioning pins are arranged on the upper end of the lower positioning member.

[0005] Side positioning components are provided at the opposite ends of the two vertical plates, and the side positioning components are located above the lower positioning components.

[0006] The side positioning assembly includes a wedge block capable of laterally reciprocating movement, a wedge surface is arranged at the far end of the wedge block, and the wedge surfaces of the wedge blocks of the positioning assemblies on both sides converge and extend downward;

[0007] A receiving groove is arranged at the far end of each wedge block, a swingable pressing claw is hinged in the receiving groove, a clearance notch is arranged at the lower side of the receiving groove for the pressing claw to swing, an elastic element is arranged between the pressing claw and the receiving groove so that the pressing claw has a tendency to swing downward, and a chamfer is arranged at the lower foot end of the pressing claw.

[0008] It also includes an upper positioning assembly, which is located above the side positioning assembly. The upper positioning assembly includes a positioning plate, and the two ends of the positioning plate are respectively connected and fixed to the vertical plate. The upper positioning plate is provided with an upper positioning surface and an upper positioning pin, and the upper positioning plate is provided with a welding through hole that passes through the upper positioning plate.

[0009] The upper end of the welding through hole is inlaid with a copper ring, and the outer end of the inner hole of the ring is chamfered.

[0010] The lower positioning assembly includes a lower support member, both ends of which are respectively connected and fixed to two vertical plates, a first linear drive device is arranged at the lower end of the lower support member, a movable end of the first linear drive device passes upward through the lower support member and is connected to the lower end of the lower positioning member, the lower support member is slidably fitted with two guide columns extending upward through a guide sleeve, and the upper ends of the guide columns are connected to the lower positioning member.

[0011] A limit block is arranged at the lower end of the guide column, and the upper end of the limit block has a limit surface and an installation groove for limiting cooperation with the lower end of the guide sleeve, the lower end of the guide column is connected to the bolt in the installation groove, and an adjustment gasket is arranged between the lower end of the guide column and the installation groove.

[0012] The side positioning assembly has a supporting block, which is connected to the vertical plate. The supporting block is provided with a slide groove, and the wedge block is slidably fitted in the slide groove. The upper positioning plate closes the upper end of the slide groove. The upper positioning plate and the slide groove form a sliding hole for the sliding fit of the wedge block. The tail end of each wedge block is connected to the active end of the second linear drive device, and the second linear drive device is installed on the corresponding vertical plate.

[0013] The receiving groove passes through the wedge block in the vertical direction, the upper ends of the two side walls of the receiving groove are provided with wedge surfaces, and a compressed elastic element is provided between the rear end of the pressure claw and the groove wall of the receiving groove.

[0014] Two pressing claws are arranged in each accommodating groove, and the two pressing claws are hinged side by side on a hinge shaft, and side grooves are arranged on adjacent sides of the two pressing claws; a bottom groove is arranged at the lower end of the pressing claw, and the bottom groove transitions to the front end of the pressing claw through an arc surface.

[0015] A copper cylindrical splash shield is arranged on the lower positioning member, the opening of the splash shield faces upward, and the bottom of the splash shield is connected to the lower positioning member.

[0016] The lower positioning piece is provided with a lower slag leakage hole, and the splash shield is provided with a corresponding upper slag leakage hole.

[0017] A collection trough is set at the lower end of the lower positioning member corresponding to the lower slag leakage hole, the two side walls of the collection trough are folded upward, the notch of the collection trough extends laterally, and the bottom of the collection trough includes a middle connecting part and an inclined portion located at the middle connecting part, and the two inclined portions converge and extend upward.

[0018] The utility model has the following beneficial effects: the base supports the vertical plate and keeps the vertical plate in a stable relative position; the lower positioning assembly can fix the whole formed by the pre-processed pipe fitting and the first flange; the reciprocating motion of the lower positioning assembly can realize the upward movement of the clamped pipe fitting and close the pipe fitting with the second flange to adjust the relative position, which is also convenient for clamping and taking out.

[0019] The pipe fitting is plane-positioned on the first flange through the lower positioning surface on the lower positioning member and the hole on the flange is positioned through the lower positioning pin, thereby realizing the positioning of the integral part formed by the entire pipe fitting and the first flange. A side positioning component is provided, and its wedge surface can press the second flange. During assembly before welding, the second flange can be inverted and pressed on the upper positioning plate of the upper positioning component. The upper positioning plate positions the second flange through the upper positioning surface and the upper positioning pin. Through the pressure claw, the end face of the first flange can be pressed, so that the first flange is pressed on the lower positioning member, so that the axial relative position of the upper end of the pipe fitting and the second flange remains stable. Through the welding through hole, it is convenient to penetrate the welding gun and perform a circle of internal groove welding operations. When the welding gun is operating, there is no obstruction, continuous welding can be performed, and automated operation can be convenient. The utility model can be used to quickly clamp the pipe fitting with a flange, facilitate the welding operation of the inner hole weld of the pipe fitting, significantly reduce welding defects, and facilitate automated production.

[0020] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model;

[0022] Figure 2 It is a top view of the utility model;

[0023] Figure 3 for Figure 2 Middle BB section view;

[0024] Figure 4 for Figure 2 Middle AA section view;

[0025] Figure 5 The utility model is a schematic diagram of the arrangement structure of the wedge removal block.

[0026] In the accompanying drawings, 100 is a base, 101 is a vertical plate, 200 is a lower positioning assembly, 210 is a lower positioning member, 211 is a lower supporting member, 213 is a first linear drive device, 214 is a guide sleeve, 215 is a guide column, 216 is a limit block, 217 is a limit surface, 218 is a mounting groove, 219 is an adjusting gasket, 300 is a side positioning assembly, 310 is a supporting block, 311 is a slide groove, 312 is a wedge block, 3152 is a side groove, 314 is a receiving groove, 315 is a pressure claw, 317 is an elastic element, 318 is a lower slag leakage hole, 319 is an upper slag leakage hole, 320 is a collecting trough, 321 is an intermediate connecting part, 322 is an inclined part, 330 is a hinge shaft, 400 is an upper positioning assembly, 412 is an upper positioning plate, 413 is an upper positioning surface, 414 is a circular ring, 500 is a splash shield, 3121 is a wedge surface, 3141 is a make way notch, and 3151 is a bottom groove. DETAILED DESCRIPTION

[0027] Specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms center, up, down, front, back, left, right, vertical, horizontal, top, bottom, inside, outside, etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, the terms first and second are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as first and second can be used to explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of multiple is two or more. It should be noted that in practical applications, due to the limitations of equipment accuracy or installation errors, absolute parallel or vertical effects are difficult to achieve. The description of vertical, parallel or same direction in this application is not an absolute limiting condition, but means that a vertical or parallel structural setting can be achieved within a preset error range and the corresponding preset effect can be achieved. In this way, the technical effect of the limited features can be maximized, and the corresponding technical solution can be easy to implement and has high feasibility.

[0030] In the description of this specification, the description of reference terms such as one embodiment, some embodiments, examples, specific examples, or some examples means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples without contradiction.

[0031] See also Figures 1 to 5 A flange inner ring welding device comprises a base 100, on which two spaced vertical plates 101 are arranged, on which a lower positioning assembly 200 is arranged, and the lower positioning assembly 200 comprises a lower positioning member 210 that can reciprocate in the vertical direction, the lower positioning member 210 is located between the two vertical plates 101, a lower positioning surface and at least two lower positioning pins are arranged at the upper end of the lower positioning member 210, and side positioning assemblies 300 are arranged at the opposite ends of the two vertical plates 101, the side positioning assembly 300 is located above the lower positioning assembly 200, and the side positioning assembly 300 comprises a wedge block 312 that can reciprocate laterally, a wedge surface 3121 is arranged at the far end of the wedge block 312, and the wedge surfaces 3121 of the wedge blocks 312 of the positioning assemblies 300 on both sides converge and extend downward;

[0032] A receiving groove 314 is provided at the far end of each wedge block 312, and a swingable pressing claw 315 is hinged in the receiving groove 314. A clearance notch 3141 is provided at the lower side of the receiving groove 314 for the pressing claw 315 to swing. An elastic element 317 is provided between the pressing claw 315 and the receiving groove 314 so that the pressing claw 315 has a tendency to swing downward. The lower foot end of the pressing claw 315 is provided with a chamfer.

[0033] It also includes an upper positioning assembly 400, which is located above the side positioning assembly 300. The upper positioning assembly 400 includes an upper positioning plate 412, the two ends of which are respectively connected and fixed to the vertical plate 101, an upper positioning surface 413 and an upper positioning pin are provided on the upper positioning plate, and a welding through hole penetrating the upper positioning plate 412 is provided on the upper positioning plate 412. Further, in order to prevent the welding slag splashed by the welding gun during operation from adhering to the upper end of the welding through hole, a copper ring 414 is inlaid, and the outer end of the inner hole of the ring 414 is chamfered. By providing the copper ring 414, since the pipe fittings of the muffler system are generally made of steel, the welding slag splashed when welding steel parts is not easy to adhere to the welding through hole due to the difference in material properties of the copper material, so that the welding through hole can be kept smooth, convenient for welding operation, and at the same time, the service life of the device can be extended.

[0034] In some embodiments, the lower positioning assembly 200 includes a lower support member 211, and the two ends of the lower support member 211 are respectively connected and fixed to the two vertical plates 101. A first linear drive device 213 is arranged at the lower end of the lower support member 211. The linear drive device can be a cylinder, a hydraulic cylinder or an electric telescopic cylinder. Of course, it can also be a screw-screw matching mechanism, a crank slider mechanism, etc. The movable end of the first linear drive device 213 passes upward through the lower support member 211 and is connected to the lower end of the lower positioning member 210. The lower support member 211 is slidably matched with two guide columns 215 extending upward through a guide sleeve 214. The upper end of the guide column 215 is connected to the lower positioning member 210. The guide column 215 can improve the guiding accuracy and ensure the welding accuracy. The linear drive device can enable the lower positioning member 210 to move in the vertical direction, which can facilitate the requirements of the lower positioning member 210 at different heights when loading, removing and welding.

[0035] Furthermore, a limit block 216 is provided at the lower end of the guide column 215, and the upper end of the limit block 216 has a limit surface 217 and a mounting groove 218 for limiting and matching with the lower end of the guide sleeve 214. The lower end of the guide column 215 is connected to the bolt in the mounting groove 218, and an adjustment gasket 219 is provided between the lower end of the guide column 215 and the mounting groove 218. By providing the limit block 216, the upper limit position of the guide column 215 can be accurately limited. When the guide column 215 is at the upper limit position, it is in a welding state, and the matching length of the second flange and the pipe fitting needs to be ensured, thereby ensuring the overall length dimensional accuracy of the entire welded part.

[0036] In some embodiments, the side positioning assembly 300 has a support block 310, which is connected to the vertical plate 101. The support block 310 is provided with a slide groove 311, and the wedge block 312 is slidably fitted in the slide groove 311. The upper positioning plate 412 closes the upper end of the slide groove 311. The upper positioning plate and the slide groove form a sliding hole for the sliding fit of the wedge block. The tail end of each wedge block is connected to the movable end of the second linear drive device, and the second linear drive device is installed on the corresponding vertical plate 101. With this structure, the processing structure of the sliding hole is relatively simple, and it is also convenient for the assembly of the wedge block 312 and the connection with the linear drive device. In the actual installation process, the upper positioning plate 412 can be installed after the wedge block 312 is installed. When the positioning accuracy of the upper positioning plate 412 decreases, it can also be convenient to replace or adjust. Secondly, with this structure, the upper side wall of the upper sliding hole is formed for the upper positioning plate 412, and the support block 310 only processes the slide groove 311, which can make the sliding hole have a larger height in the height direction, which is convenient for the installation of the thicker wedge block 312, and the wedge block 312 has a larger bending stiffness. The linear drive device can be a cylinder, a hydraulic cylinder or an electric telescopic cylinder. Further, the second linear drive device is a double-headed cylinder, the rear end of which is slidably matched in the handle bar hole, and the root of the handle is hinged at the rear end of the cylinder. The wedge block can be controlled by the handle for manual adjustment, and the cylinder is used for pressing or retreating.

[0037] In some embodiments, the accommodating groove 314 penetrates the wedge block 312 in the vertical direction, and wedge surfaces 3121 are set at the upper ends of the two side walls of the accommodating groove 314. With this structure, there can be two separate wedge surfaces 3121, which can be wedged at two positions. A compressed elastic element 317 is set between the rear end of the pressure claw 315 and the groove wall of the accommodating groove 314. The elastic element 317 can be an elastic member such as a compression spring or a polyurethane rubber block, so that the pressure claw 315 has a tendency to swing.

[0038] In some embodiments, two pressing claws 315 are arranged in each accommodating groove 314, and the two pressing claws 315 are hinged side by side on a hinge shaft 330, and side grooves 3152 are arranged on adjacent sides of the two pressing claws 315. Two clamping jaws are arranged, which can realize clamping at two points with a large spacing, and provide clamping stability; a bottom groove 3151 is arranged at the lower end of the pressing claw 315, and the bottom groove 3151 transitions to the front end of the pressing claw 315 through an arc surface, and a chamfer is formed by the arc surface. In the process of feeding toward the center, it can overcome the elastic force, pass over the edge of the first flange, and press on the upper end surface of the flange close to the center position, and has higher stability.

[0039] In some embodiments, a copper cylindrical splash shield 500 is provided on the lower positioning member 210, the opening of the splash shield 500 is upward, and the bottom of the splash shield 500 is connected to the lower positioning member 210. During welding, the splashing slag adheres to the inner wall of the workpiece, affecting the product quality, and splashes onto the lower positioning surface, affecting the accuracy of the lower positioning surface and the next clamping. During the welding process, the splash shield 500 can avoid splashing and adhesion inside the pipe and on the lower positioning surface, thereby ensuring its accuracy.

[0040] In some embodiments, the lower positioning member 210 is provided with a lower slag leakage hole 318, and the splash guard 500 is provided with a corresponding upper slag leakage hole. The welding slag accumulated in the splash guard 500 can be discharged through the slag leakage hole, which can facilitate continuous operation.

[0041] Furthermore, a collecting trough 320 is provided at the lower end of the lower positioning member 210 corresponding to the lower slag leakage hole 318, the two side walls of the collecting trough 320 are folded upward, the notch of the collecting trough 320 extends laterally, and the bottom of the collecting trough 320 includes an intermediate connecting portion 321 and an inclined portion 322 located at the intermediate connecting portion 321, and the two inclined portions 322 converge and extend upward. The setting of the collecting trough 320 can discharge the welding slag leaking through the slag leakage hole laterally, and can prevent the welding slag from entering the sealing mating surface at the end to destroy the seal when the linear drive device is a cylinder, a hydraulic cylinder or an electric telescopic cylinder, and can significantly extend the service life of the linear drive device.

[0042] When the flange is welded by adopting the above scheme, the integral structure formed by the first flange and the pipe fitting is first clamped to the lower positioning member 210, wherein the first flange is positioned by the lower positioning surface and the pin of the lower positioning member 210, and the second flange is held and positioned by the upper positioning surface 413 and the upper positioning pin of the upper positioning plate 412 of the upper positioning assembly 400, and then the entire lower positioning assembly 200 is moved to the specified position by the linear drive device 213, so that the relative position of the second flange and the upper end of the pipe fitting is adjusted, and the second flange is pressed against the upper positioning member by the side positioning assembly, and the pressure claw 315 is pressed against the first flange to complete the clamping and fixing before welding, and the welding gun is inserted into the welding groove formed by the first flange and the inner hole of the pipe fitting through the welding through hole to perform welding operation and complete the welding operation of the annular weld. After welding is completed, the side positioning assembly is loosened, and the lower positioning assembly 200 is moved down, and the welded pipe fitting is taken out to complete the welding operation.

[0043] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and their equivalents, the utility model is also intended to include these modifications and variations.

Claims

1. A flange inner ring welding device, characterized in that: The invention comprises a base (100), wherein two vertical plates (101) are arranged at intervals on the base (100), and a lower positioning assembly (200) is arranged on the base (100), wherein the lower positioning assembly (200) comprises a lower positioning member (210) capable of reciprocating in a vertical direction, the lower positioning member (210) is located between the two vertical plates (101), and a lower positioning surface and at least two lower positioning pins are arranged on the upper end of the lower positioning member (210); Side positioning assemblies (300) are disposed at the facing ends of the two vertical plates (101), the side positioning assemblies (300) being located above the lower positioning assembly (200), the side positioning assemblies (300) comprising a wedge block (312) capable of laterally reciprocating motion, a wedge surface (3121) being disposed at the distal end of the wedge block (312), and the wedge surfaces (3121) of the wedge blocks (312) of the positioning assemblies (300) on both sides converge and extend downward; A receiving groove (314) is provided at the far end of each wedge block (312), a swingable pressing claw (315) is hinged in the receiving groove (314), a clearance notch (3141) is provided at the lower side of the receiving groove (314) to allow the pressing claw (315) to swing, an elastic element (317) is provided between the pressing claw (315) and the receiving groove (314) to make the pressing claw (315) have a tendency to swing downward, and a chamfer is provided at the lower foot end of the pressing claw (315). The device also includes an upper positioning assembly (400), wherein the upper positioning assembly (400) is located above the side positioning assembly (300), and the upper positioning assembly (400) includes an upper positioning plate (412), wherein two ends of the upper positioning plate (412) are respectively connected and fixed to the vertical plate (101), an upper positioning surface (413) and an upper positioning pin are provided on the upper positioning plate, and a welding through hole penetrating the upper positioning plate (412) is provided on the upper positioning plate (412).

2. The flange inner ring welding device according to claim 1 is characterized in that: A copper ring (414) is inlaid at the upper end of the welding through hole, and a chamfer is arranged at the outer end of the inner hole of the ring (414).

3. The flange inner ring welding device according to claim 1, characterized in that: The lower positioning assembly (200) comprises a lower support member (211), the two ends of the lower support member (211) are respectively connected and fixed to the two vertical plates (101), a first linear drive device (213) is arranged at the lower end of the lower support member (211), a movable end of the first linear drive device (213) passes through the lower support member (211) upwards and is connected to the lower end of the lower positioning member (210), the lower support member (211) is slidably matched with two guide pillars (215) extending upwards through a guide sleeve (214), and the upper ends of the guide pillars (215) are connected to the lower positioning member (210).

4. The flange inner ring welding device according to claim 3 is characterized in that: A limit block (216) is provided at the lower end of the guide column (215); the upper end of the limit block (216) has a limit surface (217) and a mounting groove (218) for limiting cooperation with the lower end of the guide sleeve (214); the lower end of the guide column (215) is connected to a bolt in the mounting groove (218); and an adjustment gasket (219) is provided between the lower end of the guide column (215) and the mounting groove (218).

5. The flange inner ring welding device according to claim 1, characterized in that: The side positioning assembly (300) comprises a support block (310), wherein the support block (310) is connected to the vertical plate (101), and a slide groove (311) is provided on the support block (310). The wedge block (312) is slidably fitted in the slide groove (311), and the upper positioning plate (412) closes the upper end of the slide groove (311). The upper positioning plate and the slide groove form a sliding hole for the wedge block to slidably fit. The tail end of each wedge block is connected to the movable end of the second linear drive device, and the second linear drive device is installed on the corresponding vertical plate (101).

6. The flange inner ring welding device according to claim 1, characterized in that: The receiving groove (314) passes through the wedge block (312) in the vertical direction, and wedge surfaces (3121) are provided at the upper ends of the two side walls of the receiving groove (314), and a compressed elastic element (317) is provided between the rear end of the pressing claw (315) and the groove wall of the receiving groove (314).

7. The flange inner ring welding device according to claim 1 or 6, characterized in that: Two pressing claws (315) are arranged in each accommodating groove (314); the two pressing claws (315) are hinged side by side on a hinge shaft (330); side grooves (3152) are arranged on adjacent sides of the two pressing claws (315); a bottom groove (3151) is arranged at the lower end of the pressing claw (315); the bottom groove (3151) transitions to the front end of the pressing claw (315) through an arc surface.

8. The flange inner ring welding device according to claim 1, characterized in that: A copper cylindrical splash shield (500) is arranged on the lower positioning member (210); the opening of the splash shield (500) faces upward, and the bottom of the splash shield (500) is connected to the lower positioning member (210).

9. The flange inner ring welding device according to claim 8, characterized in that: The lower positioning member (210) is provided with a lower slag leakage hole (318), and the splash shield (500) is provided with a corresponding upper slag leakage hole (319).

10. The flange inner ring welding device according to claim 9, characterized in that: A material collecting trough (320) is provided at the lower end of the lower positioning member (210) corresponding to the lower slag leakage hole (318), the two side walls of the material collecting trough (320) are folded upwards, the notch of the material collecting trough (320) extends laterally, and the bottom of the material collecting trough (320) comprises a middle connecting portion (321) and an inclined portion (322) located at the middle connecting portion (321), and the two inclined portions (322) converge and extend upwards.

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