CN114211185B

CN114211185B - Auxiliary welding fixture

Info

Publication number: CN114211185B
Application number: CN202111615475.8A
Authority: CN
Inventors: 赵建军; 刘富存; 孙静涵; 张铮; 贾志; 贺喜斌; 巩家祥
Original assignee: CHN Energy Railway Equipment Co Ltd; Changzhou CRRC Ruitai Equipment Technology Co Ltd
Current assignee: CHN Energy Railway Equipment Co Ltd; Changzhou CRRC Ruitai Equipment Technology Co Ltd
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2024-02-02
Anticipated expiration: 2041-12-27
Also published as: CN114211185A

Abstract

The invention discloses an auxiliary welding fixture, which comprises: support subassembly, setting element and mounting. The locating part is located on the support subassembly, and the mounting is equipped with a plurality ofly, and a plurality of mountings all are used for supporting and spacing harrow tooth cover, and a plurality of mountings all detachably install on the locating part, and leave the contained angle of predetermineeing between the adjacent mounting, when harrow tooth cover and mounting assembly, have the contained angle of predetermineeing between the adjacent harrow tooth cover. Therefore, when the auxiliary welding fixture is used, workers do not need to manually adjust angles between adjacent harrow tooth sleeves one by one, and the welding efficiency and the welding precision of the harrow tooth sleeves are improved.

Description

Auxiliary welding fixture

Technical Field

The invention relates to the technical field of welding clamps, in particular to an auxiliary welding clamp.

Background

The cleaning vehicle is a large road maintenance machine for cleaning ballast of a ballast bed on a railway, and mainly digs out and screens the dirty and hardened ballast from the bottom of a sleeper, backfills the clean ballast meeting the standard to the ballast bed, and cleans the screened dirty soil, broken ballast and the like out of the road. The excavating chain is one of main working devices on the screening vehicle and is mainly used for excavating railway ballast. The digging chain is a closed-loop chain and is formed by sequentially and alternately connecting a plurality of digging harrow plates and an intermediate. During operation, because the harrow tooth cover on the digging ballast harrow board probably contacts with the ballast, the harrow tooth cover drops from digging the ballast harrow board easily under strong impact, therefore, the operation personnel adopts welded mode connection harrow tooth cover and dig the ballast harrow board to increase the connection stability of both.

In order to improve the working efficiency and quality of the excavating chain, a plurality of harrow tooth sleeves are welded on the excavating harrow plate, and the adjacent harrow tooth sleeves are arranged at a preset fixed angle, so that the maximization of the harrow tooth excavating range in the harrow tooth sleeves can be realized. However, in the process of assembling and welding the rake teeth, workers need to adjust the angle between the rake teeth one by one in a manual alignment mode according to experience so as to ensure that the welding of the rake teeth meets the requirements, and therefore, the welding precision and the welding efficiency are low.

Disclosure of Invention

In view of the above, it is necessary to provide an auxiliary welding jig that can effectively improve welding accuracy and welding efficiency.

An auxiliary welding fixture, comprising: a bracket assembly; the positioning piece is arranged on the bracket component; and the fixing pieces are provided with a plurality of fixing pieces, the fixing pieces are used for supporting and limiting the harrow tooth sleeves, the fixing pieces are detachably arranged on the positioning pieces, a preset included angle is reserved between every two adjacent fixing pieces, and when the harrow tooth sleeves are assembled with the fixing pieces, the preset included angle is reserved between every two adjacent harrow tooth sleeves.

In the auxiliary welding fixture, the support assembly is used for supporting the positioning pieces, and the plurality of fixing pieces are used for supporting and limiting the rake tooth sleeves, and a preset included angle is reserved between the adjacent fixing pieces, so that when the rake tooth sleeves are assembled with the fixing pieces, the preset included angle is formed between the adjacent rake tooth sleeves. Therefore, in the process of welding the ballast digging harrow plate and the harrow tooth sleeves, each harrow tooth sleeve is only required to be sleeved on the corresponding fixing piece and directly welded. Therefore, when the auxiliary welding fixture is used, workers do not need to manually adjust angles between adjacent harrow tooth sleeves one by one, and the welding efficiency and the welding precision of the harrow tooth sleeves are improved. Because a plurality of mounting are all detachably installed on the mounting, consequently, after accomplishing the welding operation, can directly remove the mounting from the rake teeth cover in, and do not influence follow-up operation.

The technical scheme is further described as follows:

in one embodiment, the positioning piece is provided with a plurality of through holes, the through holes are in one-to-one correspondence with the fixing piece, the fixing piece comprises a bolt and a nut, the inner walls of the through holes are respectively provided with an internal thread, the bolt passes through the corresponding through holes and is in threaded connection with the positioning piece, and when the rake tooth sleeve is sleeved on the bolt, the nut is sleeved on the bolt and used for limiting the rake tooth sleeve to move towards a direction far away from the positioning piece.

In one embodiment, the positioning piece comprises a plurality of positioning plates which are sequentially connected, and the adjacent positioning plates are arranged at an included angle, the through holes are formed in the positioning plates, the through holes are in one-to-one correspondence with the positioning plates, and when the bolts are arranged in the corresponding through holes in a penetrating manner, the adjacent fixing pieces are arranged at the preset included angle.

In one embodiment, the surface of the positioning plate penetrated by the through hole is a positioning surface, and the central axis of the through hole is perpendicular to the corresponding positioning surface.

In one embodiment, the support assembly comprises a support frame, the support frame is connected with the positioning piece to support the positioning piece, two support frames are arranged, and the two support frames are arranged at intervals along the length direction of the positioning piece.

In one embodiment, the support frame comprises a support rod and a support plate which are connected, the support rod is arranged along the longitudinal direction, a clamping groove is formed in the support plate, the guiding direction of the clamping groove is intersected with the axial direction of the support rod, and the positioning piece is clamped in the clamping groove.

In one embodiment, the bracket assembly further comprises a limiting seat, the limiting seat comprises a first limiting plate, a connecting plate and a second limiting plate which are sequentially connected, the first limiting plate is opposite to the second limiting plate and spaced from the second limiting plate, a containing groove for containing the ballast digging harrow plate is formed in the space between the first limiting plate, the connecting plate and the second limiting plate, the notch of the containing groove faces the horizontal direction, the support rod is inserted into the containing groove and connected with the limiting seat, the two ends of the clamping groove are respectively a starting end and a terminating end along the guiding direction of the clamping groove, the terminating end is closer to the limiting seat relative to the starting end along the longitudinal direction, and the terminating end is closer to the support rod relative to the starting end along the horizontal direction.

In one embodiment, the support rod is provided with a positioning step, and the positioning step can be abutted with the side wall of the connecting plate.

In one embodiment, the limiting seat further comprises a bottom plate, the first limiting plate, the connecting plate and the second limiting plate are connected with the bottom plate, and the bottom plate is located on one side, away from the positioning step, of the connecting plate.

In one embodiment, the first limiting plate and the second limiting plate are movably connected with the connecting plate, so that the distance between the first limiting plate and the second limiting plate is adjustable.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Moreover, the figures are not drawn to a 1:1 scale, and the relative sizes of various elements are merely exemplary in the figures, and are not necessarily drawn to true scale. In the drawings:

FIG. 1 is a schematic diagram of an auxiliary welding jig according to an embodiment of the present invention;

FIG. 2 is a schematic view of an auxiliary welding jig according to another embodiment of the present invention;

FIG. 3 is a schematic view of a positioning member according to an embodiment of the present invention;

FIG. 4 is a schematic view of a supporting frame according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a limiting seat according to an embodiment of the present invention;

FIG. 6 is a schematic view of a rake teeth and a raking plate according to an embodiment of the present invention;

FIG. 7 is a schematic view of an auxiliary welding fixture for clamping a rake teeth in accordance with an embodiment of the present invention;

FIG. 8 is a schematic diagram of an auxiliary welding fixture according to an embodiment of the present invention when clamping a raking tooth sleeve and a raking plate for ballasting;

fig. 9 is a schematic structural view of a rake finger welded to a ballast rake board according to an embodiment of the present invention.

The elements in the figures are labeled as follows:

10. auxiliary welding clamps; 110. a bracket assembly; 111. a support frame; 1111. a support rod; 11111. positioning the step; 1112. a support plate; 11121. a clamping groove; 111211, the start end; 111212, terminating end; 112. a limit seat; 1121. a first limiting plate; 1122. a connecting plate; 1123. a second limiting plate; 1124. a receiving groove; 1125. a bottom plate; 120. a positioning piece; 121. a positioning plate; 1211. perforating; 1212. an assembly groove; 1213. a positioning surface; 130. a fixing member; 131. a bolt; 132. a nut; 20. a harrow tooth cover; 30. digging a ballast harrow plate.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

Referring to fig. 1, 2 and 7, an embodiment of the present application provides an auxiliary welding fixture 10, comprising: bracket assembly 110, positioning member 120 and fixing member 130. The positioning member 120 is disposed on the bracket assembly 110. The fixing members 130 are provided with a plurality of fixing members 130, and the plurality of fixing members 130 are used for supporting and limiting the rake teeth 20. The fixing members 130 are detachably mounted on the positioning member 120. And a preset included angle is reserved between the adjacent fixing pieces 130. When the rake finger 20 is assembled with the fixing member 130, the adjacent rake finger 20 has the predetermined included angle.

In the auxiliary welding fixture 10 described above, the bracket assembly 110 is used for supporting the positioning member 120, and since the fixing members 130 are provided with a plurality of fixing members 130, and the plurality of fixing members 130 are all used for supporting and limiting the rake teeth sheath 20, a predetermined included angle is left between the adjacent fixing members 130, so that when the rake teeth sheath 20 is assembled with the fixing members 130, the adjacent rake teeth sheath 20 is also arranged with a predetermined included angle. Therefore, in the process of welding the ballast digging harrow plate 30 and the harrow tooth covers 20, each harrow tooth cover 20 is only required to be sleeved on the corresponding fixing piece 130 for direct welding. Therefore, when the auxiliary welding fixture 10 is used, workers do not need to manually adjust the angles between the adjacent rake teeth sleeves 20 one by one, so that the welding efficiency and the welding precision of the rake teeth sleeves 20 are improved. Since the fixing members 130 are detachably mounted on the fixing member 120, the fixing member 130 can be directly removed from the rake sleeve 20 after the welding operation is completed, without affecting the subsequent operation.

Referring to fig. 2, 3 and 7, in an embodiment of the foregoing embodiment, a plurality of through holes 1211 are provided on the positioning member 120, and the through holes 1211 are in one-to-one correspondence with the fixing member 130. The fixing member 130 includes a bolt 131 and a nut 132. The inner walls of the perforations 1211 are each provided with an internal thread (not shown). The bolts 131 are screwed with the positioning member 120 through the corresponding through holes 1211. When the rake sleeve 20 is sleeved on the bolt 131, the nut 132 is sleeved on the bolt 131 to limit the rake sleeve 20 to move in a direction away from the positioning piece 120.

Referring to fig. 1 to 3, in an embodiment, the positioning member 120 includes a plurality of positioning plates 121 sequentially connected, and an included angle is formed between adjacent positioning plates 121. The through holes 1211 are provided on the positioning plate 121, and the through holes 1211 are in one-to-one correspondence with the positioning plate 121. When the bolts 131 are inserted into the corresponding through holes 1211, the adjacent fixing members 130 are disposed at the predetermined included angle.

Referring to fig. 2, 3, 8 and 9, specifically, when the auxiliary welding fixture 10 is used, the bolt 131 is inserted into the through hole 1211, and the positioning member 120 is sufficient to support the bolt 131 because the bolt 131 is screwed with the inner wall of the through hole 1211, so that the bolt 131 can be effectively prevented from being separated from the through hole 1211. When welding is required, each rake tooth sleeve 20 is sleeved on the corresponding bolt 131, in the sleeving process, one end of the rake tooth sleeve 20 can be abutted against the positioning piece 120, then the nut 132 is sleeved on the corresponding bolt 131, and the rake tooth sleeve 20 is fixed on the bolt 131 by the nut 132. In this way, the rake teeth 20 can be disposed at a predetermined angle. During welding, the welding surface of the ballast digging harrow plate 30 is aligned to each harrow tooth cover 20, and each harrow tooth cover 20 and the ballast digging harrow plate 30 are welded one by using a welding tool so as to finish the welding operation of the harrow tooth cover 20 and the ballast digging harrow plate 30. When the welding operation is completed, the nut 132 is screwed to withdraw the nut 132 from the bolt 131, at this time, the bolt 131 may be screwed to withdraw the bolt 131 from the through hole 1211, so that the bracket assembly 110 and the positioning member 120 can be separated from the rake sleeve 20 and the ballast-digging rake plate 30 after the welding assembly. When another harrow tooth cover 20 and another dredging harrow plate 30 are needed to be welded, the steps are repeated. It can be seen that the consistency of the welding assembly of the harrow tooth cover 20 and the digging ballast harrow plate 30 can be realized through the auxiliary welding fixture 10.

Alternatively, in another embodiment, the securing member 130 includes a connecting rod and a snap ring. Wherein, one end of the connecting rod is provided with a clamping ring, and the diameter of the clamping ring is larger than that of the through hole 1211, so that the connecting rod can be prevented from falling off after being inserted into the through hole 1211. The snap ring comprises a first ring body and a second ring body which are hinged with each other, and when the rake tooth sleeve 20 needs to be locked, the first ring body and the second ring body are buckled. When it is desired to remove the connecting rod from the perforations 1211 and the rake sleeve 20, the first ring body and the second ring body are separated.

Specifically, in this embodiment, three rake teeth sleeves 20 are welded on the ballast digging harrow plate 30, so, as shown in fig. 2, 3 and 7, three fixing members 130 and three positioning plates 121 are respectively provided. And the three positioning plates 121 are surrounded to form an assembly groove 1212 with one end opened. The rake finger 20 is sleeved on the corresponding positioning piece 120 and is located in the assembly groove 1212.

For convenience of description of the connection assembly relationship between the positioning plates 121, the three positioning plates 121 are referred to as a first positioning plate, a second positioning plate, and a third positioning plate, respectively. The first locating plate and the third locating plate are respectively connected to two ends of the second locating plate, the first locating plate and the second locating plate are arranged at a first preset included angle, and the third locating plate and the second locating plate are arranged at a second preset included angle.

It should be noted that the value of the first preset included angle and the value of the second preset included angle may be the same or different. And the specific requirements can be determined according to the actual requirements.

For the sake of clear understanding, in this embodiment, taking fig. 3 as an example, the first preset included angle is represented by θ ₁ Representing the second preset included angle as theta ₂ And (3) representing. Wherein 0 DEG < theta ₁ ＜180°，0°＜θ ₂ ＜180°。

Specifically, in the present embodiment, the first preset included angle is equal to the second preset included angle, i.e., θ ₁ ＝θ ₂ 。

In order to improve the stability of the rake sleeve 20 during fixing, referring to fig. 3, in an embodiment, a surface of the positioning plate 121 penetrated by the through hole 1211 is a positioning surface 1213. The central axis of the through hole 1211 is perpendicular to the corresponding positioning surface 1213. Thus, as shown in fig. 3 and 7, when the rake 20 is fitted over the bolt 131, the end of the rake 20 can be fitted to the positioning surface 1213.

Referring to fig. 1, in one embodiment, the bracket assembly 110 includes a supporting frame 111. The supporting frame 111 is connected to the positioning member 120 to support the positioning member 120.

Specifically, in order to improve stability when the supporting frame 111 supports the positioning member 120, in this embodiment, two supporting frames 111 are provided, and the two supporting frames 111 are disposed at opposite intervals along the length direction of the positioning member 120.

Specifically, the positioning member 120 includes three positioning plates 121, and two supporting members 111 are disposed at opposite intervals along the arrangement direction, i.e., the length direction, of the three positioning plates 121.

Further, as shown in fig. 1 and 4, in one embodiment, the support 111 includes a support rod 1111 and a support plate 1112 connected to each other. The support bar 1111 is disposed in a longitudinal direction. The support plate 1112 is provided with a clamping groove 11121, the guiding direction of the clamping groove 11121 intersects with the axial direction of the support rod 1111, and the positioning member 120 is clamped in the clamping groove 11121.

Referring to fig. 1 and 5, in an embodiment, the bracket assembly 110 further includes a limiting seat 112. The limiting seat 112 includes a first limiting plate 1121, a connecting plate 1122, and a second limiting plate 1123, which are sequentially connected. The first and second stopper plates 1121 and 1123 are opposite to and spaced apart from each other. The space between the first limiting plate 1121, the connecting plate 1122 and the second limiting plate 1123 forms a receiving groove 1124 for receiving the ballast digging harrow plate 30.

Specifically, as shown in fig. 1 and 4, in the present embodiment, the notch of the receiving groove 1124 faces in the horizontal direction. The supporting rod 1111 is inserted into the receiving groove 1124 and connected to the limiting seat 112. The two ends of the clamping groove 11121 are respectively a start end 111211 and a stop end 111212 along the guiding direction of the clamping groove 11121. The terminating end 111212 is closer to the limit seat 112 than the starting end 111211 in the longitudinal direction. The terminating end 111212 is closer to the support bar 1111 than the starting end 111211 in the horizontal direction. Thus, when the positioning member 120 is clamped in the clamping groove 11121, the assembly groove 1212 formed by each positioning plate 121 faces the receiving groove 1124, so that the rake teeth 20 sleeved on the bolt 131 also faces the receiving groove 1124. During welding, the ballast digging harrow plate 30 can be placed in the accommodating groove 1124, at this time, each harrow tooth sleeve 20 is located above the ballast digging harrow plate 30 at a preset angle, and each harrow tooth sleeve 20 and the ballast digging harrow plate 30 are welded by using welding equipment. In addition, in order to further improve the stability of the welding of the rake teeth 20 on the ballast cutting rake plate 30, two adjacent rake teeth 20 are welded.

In this embodiment, three tine bushings 20 are welded to the ballast raking plate 30 to form a chain unit. In order to improve the consistency of each chain unit, the size of the accommodating groove 1124 is adapted to the size of the ballast digging harrow plate 30, so that the positions of the ballast digging harrow plates 30 when being placed in the accommodating groove 1124 are the same, and thus, the positions of the harrow tooth sleeves 20 welded on the ballast digging harrow plates 30 are the same.

It should be noted that, the "size of the accommodating groove 1124 is adapted to the size of the ballast digging harrow plate 30" means that, as shown in fig. 5, 6 and 9, the distance L between the first limiting plate 1121 and the second limiting plate 1123 is slightly greater than the width W of the ballast digging harrow plate 30, so that the ballast digging harrow plate 30 can be just clamped into the accommodating groove 1124. Meanwhile, when each of the ballast digging harrow plates 30 is clamped into the accommodating groove 1124, the end parts of each of the ballast digging harrow plates 30 are abutted against the connecting plates 1122, so that the consistency of each chain unit is further ensured.

Referring to fig. 1, 4 and 5, in an embodiment, the supporting rod 1111 is provided with a positioning step 11111, and the positioning step 11111 may abut against a side wall of the connecting plate 1122. Thus, the support 111 and the limit seat 112 can be conveniently positioned and matched.

Optionally, the supporting rod 1111 is detachably connected to the limiting seat 112. For example, the supporting rod 1111 is mounted on the limiting seat 112 by means of a snap connection or a screw connection. Thus, any part is convenient to replace.

Optionally, in another embodiment, the supporting rod 1111 is fixedly connected to the limiting seat 112 for improving the supporting strength and stability of the bracket assembly 110. For example, the supporting rod 1111 is welded to the limiting seat 112. Alternatively, the supporting rod 1111 is integrally formed on the limiting seat 112.

Referring to fig. 4, 5 and 8, in an embodiment, the limiting seat 112 further includes a bottom plate 1125. The first limiting plate 1121, the connecting plate 1122, and the second limiting plate 1123 are all connected to the bottom plate 1125, and the bottom plate 1125 is located at a side of the connecting plate 1122 away from the positioning step 11111. In this manner, the bottom plate 1125 may support the ballast rake 30.

Based on the above embodiments, in an embodiment, the first limiting plate 1121 and the second limiting plate 1123 are movably connected to the connecting plate 1122, so that the distance between the first limiting plate 1121 and the second limiting plate 1123 is adjustable. In other words, the distance L between the first and second stopper plates 1121, 1123 is variable. In this way, the distance between the first limiting plate 1121 and the second limiting plate 1123 can be adjusted according to the type of the digging and raking plate 30, so that the accommodating groove 1124 can clamp digging and raking plates 30 with different types, and the applicability of the auxiliary welding fixture 10 is improved.

Further, the supporting rod 1111 is a telescopic rod, so that the height of the supporting rod 1111 can be adjusted according to the type of the digging harrow plate 30, so as to further improve the adaptability of the auxiliary welding fixture 10.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. An auxiliary welding jig, characterized by comprising:

a bracket assembly;

the positioning piece is arranged on the bracket assembly and comprises a plurality of positioning plates which are connected in sequence, and the adjacent positioning plates are arranged at an included angle; and

The mounting, the mounting is equipped with a plurality of, and a plurality of the mounting all is used for supporting and spacing harrow tooth cover, a plurality of the mounting all detachably installs on the setting element, the mounting with the locating plate one-to-one, and is adjacent leave the contained angle of predetermineeing between the mounting, works as the harrow tooth cover with during the mounting installation, adjacent have between the harrow tooth cover predetermineeing the contained angle.

2. The auxiliary welding fixture of claim 1, wherein the positioning plate is provided with through holes, the through holes are in one-to-one correspondence with the fixing pieces, the fixing pieces comprise bolts and nuts, the inner walls of the through holes are respectively provided with internal threads, the bolts penetrate through the corresponding through holes to be in threaded connection with the positioning pieces, and when the rake tooth sleeves are sleeved on the bolts, the nuts are sleeved on the bolts to limit the rake tooth sleeves to move in a direction away from the positioning pieces.

3. The auxiliary welding jig of claim 1 wherein the number of locating members is three.

4. The auxiliary welding jig according to claim 2, wherein the surface of the positioning plate penetrated by the through holes is a positioning surface, and the central axis of the through holes is perpendicular to the corresponding positioning surface.

5. The auxiliary welding jig of any one of claims 1-4, wherein the bracket assembly comprises a support frame connected to the positioning member to support the positioning member, the support frame has two support frames, and the two support frames are disposed at opposite intervals along the length direction of the positioning member.

6. The auxiliary welding jig according to claim 5, wherein the supporting frame comprises a supporting rod and a supporting plate which are connected, the supporting rod is arranged along the longitudinal direction, a clamping groove is formed in the supporting plate, the guiding direction of the clamping groove is intersected with the axial direction of the supporting rod, and the positioning piece is clamped in the clamping groove.

7. The auxiliary welding fixture of claim 6, wherein the bracket assembly further comprises a limiting seat, the limiting seat comprises a first limiting plate, a connecting plate and a second limiting plate which are sequentially connected, the first limiting plate is opposite to the second limiting plate and is spaced from the second limiting plate, a containing groove for containing the ballast digging harrow plate is formed in a space between the first limiting plate, the connecting plate and the second limiting plate, a notch of the containing groove faces to the horizontal direction, the support rod is inserted into the containing groove and is connected with the limiting seat, two end parts of the clamping groove are a starting end and a terminating end respectively along the guiding direction of the clamping groove, the terminating end is closer to the limiting seat relative to the starting end along the longitudinal direction, and the terminating end is closer to the support rod relative to the starting end along the horizontal direction.

8. The auxiliary welding jig according to claim 7, wherein the support bar is provided with a positioning step, the positioning step being abuttable against a side wall of the connection plate.

9. The auxiliary welding jig of claim 8, wherein the limit base further comprises a bottom plate, the first limit plate, the connecting plate, and the second limit plate are all connected with the bottom plate, and the bottom plate is located on a side of the connecting plate facing away from the positioning step.

10. The auxiliary welding jig according to claim 7, wherein the first and second limiting plates are movably connected to the connecting plate such that a distance between the first and second limiting plates is adjustable.