Positioning device and welding machine

Abstract

The present invention discloses a positioning device and a welding machine, which relate to the technical field of welding equipment, including a mounting base, the mounting base having a through hole, the through hole being provided with a first end, a second end, a third end and a fourth end; a first positioning member for positioning one end of a guide rail body; a plurality of second positioning members, the second positioning member being fixed to the mounting base and arranged between the first end and the first positioning member; a first positioning portion including a first limiting member and a second limiting member, the first limiting member being fixed to the mounting base and close to the second end, the second limiting member being movably arranged on the mounting base and close to the fourth end; and a second positioning portion including a mounting seat, a third limiting member, a positioning component and a first elastic member, the mounting seat being fixed to the mounting base and close to the third end, the positioning component being used to position and support the lower bracket, the third limiting member being slidably arranged on the mounting seat, and the third limiting member being able to move in a direction perpendicular to the central axis of the through hole under the action of the first elastic member.

Description

Technical Field

[0001] The present invention relates to the technical field of welding equipment, and in particular to a positioning device and a welding machine. Background Art

[0002] The car door frame is made of various metal parts spliced ​​and welded together, and the B-pillar glass guide rail is a necessary part of it, which is used to guide the sliding of the car window glass. Specifically, the B-pillar glass guide rail of the car front door frame is mainly made of the guide rail body and the lower bracket welded to each other. In the typical structure of the existing B-pillar glass guide rail of the car front door frame, the lower bracket is small in size, the positioning feature has only one positioning hole, and the part welded to the guide rail body occupies 1 / 3 of the lower bracket. The old positioning structure of the existing spot welding fixture used to position and fix the lower bracket is difficult to position during use, and it is difficult for workers to take and place it after positioning; at the same time, in the existing design, the positioning structure design of the guide rail body is unreasonable, which also makes it difficult to take and place the guide rail body. Due to the positioning defects of both the lower bracket and the guide rail body on the fixture, it is necessary to invent a more reliable, convenient, and less troublesome positioning structure to ensure smooth production. Summary of the Invention

[0003] The present invention aims to at least partially address one of the aforementioned technical problems in the prior art. To this end, an embodiment of the present invention provides a positioning device that modifies the positioning and fixing method and optimizes the relevant structural design, thereby enabling precise positioning and fixing of the lower bracket and the guide rail body, while also making it easier to remove and place.

[0004] An embodiment of the present invention also provides a welding machine.

[0005] According to an embodiment of the first aspect of the present invention, a positioning device is provided, including a mounting base, the mounting base having a through hole for a first electrode head to pass through, the edge of the through hole being provided with a first end, a second end, a third end and a fourth end, the line connecting the first end and the third end intersecting and perpendicular to the line connecting the second end and the fourth end; a first positioning member provided on the mounting base for positioning one end of a guide rail body; at least two second positioning members for fixing the guide rail body, the second positioning members being fixed to the mounting base and spaced apart between the first end and the first positioning member; a first positioning portion including a first limiting member and a second limiting member, the first limiting member being fixed to the mounting base and close to the second end, The second limit member is movably arranged on the mounting base and close to the fourth end, wherein, under the action of external force, the second limit member can rotate in a direction away from the first limit member; and a second positioning portion, including a mounting seat, a third limit member, a positioning component and a first elastic member, the mounting seat is fixed to the mounting base and close to the third end, the positioning component is arranged on the mounting seat, the positioning member is used to position and support the lower bracket, the third limit member is slidably arranged on the mounting seat, and the third limit member can move in a direction perpendicular to the central axis of the through hole under the action of the first elastic member, and the third limit member is used to provide a pre-pressure acting on the other end of the positioned guide rail body.

[0006] The above-mentioned positioning device has at least the following beneficial effects: after the positioning device is installed on the welding machine and debugged, the first electrode head of the welding machine extends from the center of the through hole. When welding the B-pillar glass guide rail, one end of the guide rail body is pressed against the first positioning piece as a positioning reference, and then the other end is slowly lowered into the guide rail body, so that the part between the two ends of the guide rail body is sequentially clamped on the second positioning piece and the first limit piece, completing the preliminary positioning and definition of the guide rail body. Before the end of the guide rail body to be welded moves to the center of the through hole and abuts against the first electrode head, an external force is applied to the third limit piece to cause the third limit piece to compress the first elastic piece and move in a direction away from the through hole, thereby freeing up space for the operator to place The guide rail body, after the end of the guide rail body to be welded is against the first electrode head, the external force acting on the third limit piece is removed, so that the third limit piece is pushed against the other end of the guide rail body under the action of the first elastic member, thereby realizing complete positioning and limitation of the guide rail body. Then the lower bracket is placed, and after the lower bracket is positioned and fixed on the positioning component, the end of the lower bracket to be welded is pressed against the end of the guide rail body to be welded, and the lower bracket is between the first limit piece and the second limit piece. The first limit piece serves as the positioning reference of the lower bracket, and pre-pressure is applied to the lower bracket through the second limit piece to complete the positioning and limitation of the lower bracket. After the above process is completed, the second electrode head of the welding machine is driven to move toward the first electrode head, thereby welding the lower bracket to the guide rail body. By setting the positioning reference surface of the guide rail body at the end to be welded away from the guide rail body, and setting the structure for positioning and limiting the end to be welded of the guide rail body near the electrode head, the placement of the guide rail body is facilitated. At the same time, the consistency of the welding position of each B-pillar glass guide rail after welding is ensured, and the accuracy is guaranteed. At the same time, the guide rail body and the lower bracket share the same set of first positioning parts, which ensures that the guide rail body and the lower bracket are pressed into place while reducing the parts used for positioning, freeing up space for the operator's hands to be placed near the lower electrode head, facilitating the removal and placement of the guide rail body and the lower bracket, effectively improving production efficiency, and ensuring the welding quality of the same batch of B-pillar glass guide rails.

[0007] According to the positioning device described in the embodiment of the first aspect of the present invention, the second positioning portion also includes a fourth limiting member, which is arranged on the mounting seat, and the fourth limiting member cooperates with the mounting seat to form a guide groove for the third limiting member to slide, so that the third limiting member can perform linear reciprocating motion.

[0008] According to the positioning device described in the embodiment of the first aspect of the present invention, a connecting end is raised in the middle of the top surface of the mounting seat to form steps on both sides of the mounting seat. After the fourth limiting member is installed on the connecting end, it combines with the step to form the guide groove.

[0009] According to the positioning device described in the embodiment of the first aspect of the present invention, both ends of the third limiting member extend in a direction perpendicular to the length of the third limiting member to form a limiting portion, so that the third limiting member is U-shaped, the limiting portion is located in the guide groove, and the connecting end is located between the two limiting portions.

[0010] According to the positioning device described in the embodiment of the first aspect of the present invention, the side of the fourth limiting member has a convex end extending to the limiting portion, and the limiting portion is provided with a notch that cooperates with the convex end, so that the range of movement of the third limiting member is limited by the cooperation between the convex end and the notch.

[0011] According to the positioning device described in the embodiment of the first aspect of the present invention, the second positioning part also includes a first limit block, the first limit block is arranged on the mounting substrate and is located on the side of the mounting seat away from the through hole, the first elastic member is located between the first limit block and the third limit member, one end of the first elastic member is against the first limit block, and the other end is against the third limit member.

[0012] According to the positioning device described in the embodiment of the first aspect of the present invention, the first positioning part also includes a support member, a second elastic member and an adjusting member, the support member is fixed to the mounting base plate, and a first notch is provided on the side of the support member facing the first limiting member, one end of the second limiting member is hinged to the first notch, the adjusting member is inserted into the support member, and the end of the adjusting member enters the first notch and connects to the other end of the second limiting member, one end of the second elastic member abuts against the support member, and the other end abuts against the second limiting member.

[0013] According to the positioning device described in the embodiment of the first aspect of the present invention, the positioning member includes a positioning pin capable of cooperating with the positioning hole of the lower bracket and a support block for cooperating with the groove of the lower bracket, and the positioning pin and the support block are both arranged on the top of the mounting seat.

[0014] According to the positioning device described in the embodiment of the first aspect of the present invention, the first positioning member is used to position a resistance detection conductive block embedded on one side of the guide rail body, the second positioning member has a limiting groove for limiting the movement of the guide rail body, the middle part of the limiting groove is protruded with a support end, the first limiting member is provided with a second notch on the side facing the second limiting member, and the second notch is provided with the support end.

[0015] According to an embodiment of the second aspect of the present invention, a welding machine is provided, comprising a frame; a welding platform arranged on the frame, a first electrode head being provided on the welding platform, a second electrode head being provided on the frame opposite to the first electrode head; and the above-mentioned positioning device, the mounting substrate being fixed to the welding platform, and the first electrode head being located at the center of the through hole.

[0016] The above-mentioned welding machine has at least the following effects: when the welding machine equipped with the above-mentioned positioning device is welding the B-pillar glass guide rail, by setting the positioning reference surface of the guide rail body away from the end to be welded of the guide rail body, the structure for positioning and limiting the end to be welded of the guide rail body is set near the electrode head, which is convenient for the placement of the guide rail body. At the same time, it ensures the consistency of the welding position of each B-pillar glass guide rail after welding, and the accuracy is guaranteed. At the same time, the guide rail body and the lower bracket share the same set of first positioning parts, which ensures that the guide rail body and the lower bracket are pressed into place while reducing the parts used for positioning, freeing up space for the operator's hands to be placed near the lower electrode head, facilitating the removal and placement of the guide rail body and the lower bracket, effectively improving production efficiency, and ensuring the welding quality of the same batch of B-pillar glass guide rails. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0018] Figure 1 1 is a structural diagram of a welding machine according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the positioning device in an embodiment of the present invention. Figure 1 ;

[0020] Figure 3 This is a schematic diagram of the structure of the positioning device in an embodiment of the present invention. Figure 2 ;

[0021] Figure 4 This is a schematic diagram of the structure of the positioning device in an embodiment of the present invention. Figure 3 ;

[0022] Figure 5 This is a schematic diagram of the structure of the positioning device in an embodiment of the present invention. Figure 4 ;

[0023] Figure 6 yes Figure 5 Cross-sectional view along AA direction;

[0024] Figure 7 This is a schematic diagram of the structure of the positioning device in an embodiment of the present invention. Figure 5 ;

[0025] Figure 8 yes Figure 7Cross-sectional view along the BB direction;

[0026] Figure 9 This is a schematic diagram of the structure of the positioning device in an embodiment of the present invention. Figure 6 ;

[0027] Figure 10 This is a schematic diagram of the structure of the positioning device in an embodiment of the present invention. Figure 7 ;

[0028] Figure 11 1 is a schematic structural diagram of a guide rail body in an embodiment of the present invention;

[0029] Figure 12 It is a structural schematic diagram of the lower bracket in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0032] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0033] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0034] The B-pillar glass guide rail is an essential part of the car door frame and is used to guide the sliding of the car window glass. Specifically, the B-pillar glass guide rail of the car front door frame is mainly composed of a guide rail body 310 and a lower bracket 320 welded together. In the typical structure of the B-pillar glass guide rail of the existing car front door frame, such as Figure 12As shown, the lower bracket 320 is small in size and irregular in shape. Although there is a groove 322, the positioning feature is only one positioning hole 321. Figure 11 As shown, the guide rail body 310 is an elongated structure with a groove structure, and the cross-sectional shapes of the guide rail body 310 and the lower bracket 320 are both U-shaped.

[0035] Reference Figures 2 to 5 The positioning device 200 of an embodiment of the present invention includes a mounting substrate 210, a first positioning member 220, a second positioning member 230, a first positioning portion 240 and a second positioning portion, wherein the mounting substrate 210 serves as a reference for installation, the first positioning member 220, the second positioning member 230, the first positioning portion 240 and the second positioning portion are all arranged on the mounting substrate 210, and the mounting substrate 210 has a through hole for the first electrode head 120 to pass through, and the edge of the through hole is provided with a first end, a second end, a third end and a fourth end, and the line connecting the first end and the third end intersects and is perpendicular to the line connecting the second end and the fourth end. Specifically, the first end is opposite to the third end, and the second end is opposite to the fourth end.

[0036] The first positioning member 220 is disposed at a position of the mounting substrate 210 away from the through hole. The first positioning member 220 is used to position one end of the guide rail body 310 . A resistance detection conductive block 221 is embedded on one side of the first positioning member 220 used to position the guide rail body 310 .

[0037] There are at least two second positioning members 230, and the second positioning members 230 are arranged between the first end and the first positioning member 220 at intervals according to the placement shape of the guide rail body 310 during welding, so that multiple second positioning members 230 can support the middle part of the guide rail body 310 to ensure smooth welding. Furthermore, the second positioning member 230 has a limiting groove for limiting the movement of the guide rail body 310, and a support end 280 is raised in the middle of the limiting groove. After the guide rail body 310 is inserted into the limiting groove, the support end 280 is embedded in the groove structure of the guide rail body 310 to support the guide rail body 310, thereby avoiding deformation of the two sides of the groove structure during positioning and limitation.

[0038] like Figure 5As shown, the first positioning portion 240 includes a first limiting member 241 and a second limiting member 243. The first limiting member 241 is fixed to the mounting base 210 and is close to the second end. The second limiting member 243 is movably arranged on the mounting base 210 and is close to the fourth end. Under the action of external force, the second limiting member 243 can rotate in a direction away from the first limiting member 241. When the lower bracket 320 or the guide rail body 310 is placed between the second limiting member 243 and the first limiting member 241, the second limiting member 243 can provide a preload force on the lower bracket 320. 20 or one side of the guide rail body 310, so that the other side of the lower bracket 320 or the guide rail body 310 rests on the first limiting member 241, completing the side compression positioning of the lower bracket 320 or the guide rail body 310. In addition, the first limiting member 241 is provided with a second notch on the side facing the second limiting member 243, and the second notch is provided with a support end 280. The setting of the second notch provides a positioning reference for the side of the lower bracket 320 or the guide rail body 310, and the setting of the support end 280 can effectively support the end of the guide rail body 310 to be welded.

[0039] like Figure 4 and Figure 6 As shown, the second positioning portion includes a mounting seat 261, a third limiting member 251, a positioning component and a first elastic member 253. The mounting seat 261 is fixed to the mounting substrate 210 and close to the third end. The positioning member is arranged on the mounting seat 261. The positioning member is used to position and support the lower bracket 320. The third limiting member 251 is slidably arranged on the mounting seat 261. The third limiting member 251 can move in a direction perpendicular to the central axis of the through hole under the action of the first elastic member 253. The third limiting member 251 is used to provide pre-pressure acting on the other end of the positioned guide rail body 310.

[0040] like Figure 1As shown, after the positioning device 200 is installed on the welding machine and debugged, the first electrode head 120 of the welding machine extends from the center of the through hole. When welding the B-pillar glass guide rail, one end of the guide rail body 310 is pressed against the first positioning member 220 as a positioning reference, and then the other end is slowly lowered down so that the part between the two ends of the guide rail body 310 is sequentially clamped on the second positioning member 230 and the first limiting member 241, completing the preliminary positioning and limitation of the guide rail body 310. Before the end of the guide rail body 310 to be welded moves to the center of the through hole and abuts against the first electrode head 120, an external force is applied to the third limiting member 251 to compress the first elastic member 253 and move in a direction away from the through hole, thereby making room for the operator to place the guide rail body 310. After the end of the guide rail body 310 to be welded abuts against the first electrode head 120, the external force acting on the third limiting member 251 is removed, so that the third limiting member 251 is in a position to move. Under the action of the first elastic member 253, the other end of the guide rail body 310 is pushed against. Even if the end of the guide rail body 310 does not abut against the resistance detection conductive block 221 after the initial positioning and definition, the third limiting member 251 can ensure that it is positioned in place, thereby achieving complete positioning and definition of the guide rail body 310, facilitating subsequent energized welding of the electrode head. Then, the lower bracket 320 is placed. After the lower bracket 320 is positioned and fixed to the positioning member, the end to be welded of the lower bracket 320 is sleeved on the end to be welded of the guide rail body 310, and the lower bracket 320 is located between the first limiting member 241 and the second limiting member 243. The first limiting member 241 serves as a positioning reference for the lower bracket 320. The second limiting member 243 applies a pre-pressure to the lower bracket 320 to complete the positioning and definition of the lower bracket 320. After the above process is completed, the second electrode head 130 of the welding machine is driven to move toward the first electrode head 120, thereby welding the lower bracket 320 to the guide rail body 310.

[0041] By setting the positioning reference surface of the guide rail body 310 away from the end to be welded of the guide rail body 310, and setting the structure for positioning and limiting the end to be welded of the guide rail body 310 near the electrode head, the placement of the guide rail body 310 is facilitated. At the same time, the consistency of the welding position of each B-pillar glass guide rail after welding is ensured, and the accuracy is guaranteed. At the same time, the guide rail body 310 and the lower bracket 320 share the same set of first positioning parts 240, ensuring that the guide rail body 310 and the lower bracket 320 are pressed into place sideways while reducing the parts used for positioning, freeing up space for the operator's hands to be placed near the lower electrode head, facilitating the removal and placement of the guide rail body 310 and the lower bracket 320, effectively improving production efficiency, and ensuring the welding quality of the same batch of B-pillar glass guide rails.

[0042] Further, such as Figure 9 and Figure 10As shown, the second positioning portion also includes a fourth limiting member 262, which is arranged on the mounting seat 261, and the fourth limiting member 262 cooperates with the mounting seat 261 to form a guide groove for the third limiting member 251 to slide, so that the third limiting member 251 can perform linear reciprocating motion, ensuring that each time the third limiting member 251 can be pressed against the side of the guide rail body 310 under the action of the first elastic member 253, even if the end of the guide rail body 310 after the initial positioning limit does not press against the resistance detection conductive block 221, it can be ensured to be positioned in place under the push of the third limiting member 251.

[0043] Specifically, a connecting end is raised in the middle of the top surface of the mounting seat 261 to form steps on both sides of the mounting seat 261. After the fourth limiting member 262 is installed on the connecting end, it is combined with the step to form a guide groove. Both ends of the third limiting member 251 extend in a direction perpendicular to the length of the third limiting member 251 to form a limiting portion, so that the third limiting member 251 is U-shaped. Figure 3 As shown, the limiting portion is located in the guide groove, and the connecting end is located between the two limiting portions. Through the mutual cooperation of the connecting end, the step, the fourth limiting member 262 and the limiting portion, precise guidance of the third limiting member 251 is achieved, ensuring that the third limiting member 251 can resist the side of the guide rail body 310 each time.

[0044] In some embodiments, as Figure 3 As shown, the side of the fourth limiting member 262 has a protruding end 262a extending to the limiting portion, and the limiting portion is provided with a slot 251a that cooperates with the protruding end 262a. The protruding end 262a is located in the slot 251a. The length of the slot 251a determines the movable range of the third limiting member 251. The movable range of the third limiting member 251 is limited by the cooperation between the protruding end 262a and the slot 251a, so that the third limiting member 251 can be used for positioning and limiting different batches of guide rail bodies 310.

[0045] In other embodiments, Figure 5 and Figure 6 As shown, the second positioning portion also includes a first limit block 252, which is arranged on the mounting substrate 210 and is located on the side of the mounting seat 261 away from the through hole, and the first elastic member 253 is located between the first limit block 252 and the third limit member 251. One end of the first elastic member 253 is against the first limit block 252, and the other end is against the third limit member 251. Under the action of the first elastic member 253, the third limit member 251 can provide a certain pre-pressure to act on the end of the guide rail body 310 to be positioned and limited. The arrangement of the above structure also facilitates the rapid positioning and limitation of the guide rail body 310, wherein the first elastic member 253 is preferably a spring.

[0046] like Figure 7 and Figure 8As shown, the first positioning portion 240 also includes a support member 242, a second elastic member 245 and an adjusting member 244. The support member 242 is fixed to the mounting base plate 210. A first notch 242a is provided on the side of the support member 242 facing the first limiting member 241. One end of the second limiting member 243 is hinged to the first notch 242a. The adjusting member 244 is inserted into the support member 242, and the end of the adjusting member 244 enters the first notch 242a and connects to the other end of the second limiting member 243. One end of the second elastic member 245 abuts against the support member 242, and the other end abuts against the second limiting member 243. It is used to adjust the flipping amplitude of the second limit member 243 to facilitate the taking and placing of different batches of guide rail bodies 310 or lower brackets 320, and the second elastic member 245 can provide pre-pressure to drive the second limit member 243 to flip, so that the second limit member 243 can automatically pre-press the side of the guide rail body 310 or the lower bracket 320. The guide rail body 310 or the lower bracket 320 share a set of positioning and limiting structures, which reduces the use of parts and increases the available space near the through hole, making it easier for operators to take and place the guide rail body 310 or the lower bracket 320. It should be noted that the second elastic member 245 is also a spring.

[0047] Preferably, Figure 6 As shown, the positioning component includes a positioning pin 272 that can cooperate with the positioning hole 321 of the lower bracket 320 and a support block 271 for cooperating with the groove 322 of the lower bracket 320. The positioning pin 272 and the support block 271 are both arranged on the top of the mounting seat 261 to facilitate the positioning and limitation of the lower bracket 320 without the need for complicated positioning operations.

[0048] Among them, such as Figure 1 As shown, this embodiment also provides a welding machine, including a frame 100, a welding platform 110 and the above-mentioned positioning device 200, the welding platform 110 is arranged in the middle of the frame 100, and a first electrode head 120 is arranged on the welding platform 110. A second electrode head 130 is arranged at a position opposite to the first electrode head 120 on the frame 100, and a mounting substrate 210 is fixed to the welding platform 110, and the first electrode head 120 is located at the center of the through hole.

[0049] When the welding machine equipped with the above-mentioned positioning device 200 is welding the B-pillar glass guide rail, the positioning reference surface of the guide rail body 310 is set at the end to be welded away from the guide rail body 310, and the structure for positioning and limiting the end to be welded of the guide rail body 310 is set near the electrode head, which facilitates the placement of the guide rail body 310. At the same time, it ensures the consistency of the welding position of each B-pillar glass guide rail after welding, and the accuracy is guaranteed. At the same time, the guide rail body 310 and the lower bracket 320 share the same set of first positioning parts 240, which ensures that the guide rail body 310 and the lower bracket 320 are pressed into place sideways while reducing the parts used for positioning, freeing up space for the operator's hands to be placed near the lower electrode head, facilitating the removal and placement of the guide rail body 310 and the lower bracket 320, effectively improving production efficiency, and ensuring the welding quality of the same batch of B-pillar glass guide rails.

[0050] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the scope of the present invention.

Claims

1. A positioning device, characterized in that: include A mounting substrate (210), the mounting substrate (210) having a through hole for the first electrode head (120) to pass through, the edge of the through hole being provided with a first end, a second end, a third end, and a fourth end, a line connecting the first end and the third end intersecting and perpendicular to a line connecting the second end and the fourth end; A first positioning member (220) provided on the mounting base plate (210) and used for positioning one end of the guide rail body (310); at least two second positioning members (230) for fixing the guide rail body (310), the second positioning members (230) being fixed to the mounting base plate (210) and spaced apart between the first end and the first positioning member (220); a first positioning portion (240) comprising a first limiting member (241) and a second limiting member (243), wherein the first limiting member (241) is fixed to the mounting substrate (210) and is close to the second end, and the second limiting member (243) is movably disposed on the mounting substrate (210) and is close to the fourth end, wherein under the action of an external force, the second limiting member (243) is capable of rotating in a direction away from the first limiting member (241); and The second positioning portion comprises a mounting seat (261), a third limiting member (251), a positioning component and a first elastic member (253), wherein the mounting seat (261) is fixed to the mounting base plate (210) and is close to the third end, the positioning component is arranged on the mounting seat (261), and the positioning component is used to position and support the lower bracket (320), the third limiting member (251) is slidably arranged on the mounting seat (261), and the third limiting member (251) can move in a direction perpendicular to the central axis of the through hole under the action of the first elastic member (253), and the third limiting member (251) is used to provide a pre-pressure acting on the other end of the positioned guide rail body (310); The second positioning portion further includes a fourth limiting member (262), the fourth limiting member (262) being arranged on the mounting seat (261), and the fourth limiting member (262) cooperates with the mounting seat (261) to form a guide groove for the third limiting member (251) to slide, so that the third limiting member (251) can perform linear reciprocating motion; A connecting end is protruded from the middle of the top surface of the mounting seat (261), so that steps are formed on both sides of the mounting seat (261); the fourth limiting member (262) is installed on the connecting end and combines with the steps to form the guide groove; Both ends of the third limiting member (251) extend in a direction perpendicular to the length of the third limiting member (251) to form limiting portions, so that the third limiting member (251) is U-shaped, the limiting portions are located in the guide groove, and the connecting end is located between the two limiting portions.

2. The positioning device according to claim 1, characterized in that: The side of the fourth limiting member (262) has a convex end (262a) extending to the limiting portion, and the limiting portion is provided with a notch (251a) that cooperates with the convex end (262a). The movable range of the third limiting member (251) is limited by the cooperation between the convex end (262a) and the notch (251a).

3. The positioning device according to claim 1 or 2, characterized in that: The second positioning portion further includes a first limiting block (252), the first limiting block (252) being arranged on the mounting substrate (210) and located on a side of the mounting seat (261) away from the through hole, the first elastic member (253) being located between the first limiting block (252) and the third limiting member (251), one end of the first elastic member (253) being against the first limiting block (252), and the other end being against the third limiting member (251).

4. The positioning device according to claim 1 or 2, characterized in that: The first positioning portion (240) further includes a support member (242), a second elastic member (245) and an adjusting member (244), wherein the support member (242) is fixed to the mounting substrate (210), and a first notch (242a) is provided on a side of the support member (242) facing the first limiting member (241), one end of the second limiting member (243) is hinged to the first notch (242a), and the adjusting member (244) is inserted into the support member (242), and the end of the adjusting member (244) enters the first notch (242a) and connects to the other end of the second limiting member (243), and one end of the second elastic member (245) abuts against the support member (242), and the other end abuts against the second limiting member (243).

5. The positioning device according to claim 1 or 2, characterized in that: The positioning member comprises a positioning pin (272) capable of cooperating with the positioning hole (321) of the lower bracket (320) and a support block (271) for cooperating with the groove (322) of the lower bracket (320). The positioning pin (272) and the support block (271) are both arranged on the top of the mounting seat (261).

6. The positioning device according to claim 1, characterized in that: The first positioning member (220) is used for positioning a resistance detection conductive block (221) embedded on one side of the guide rail body (310), the second positioning member (230) has a limiting groove for limiting the movement of the guide rail body (310), a support end (280) is protruded from the middle of the limiting groove, and a second notch is provided on the side of the first limiting member (241) facing the second limiting member (243), and the second notch is provided with the support end (280).

7. A welding machine, characterized in that: include rack(100); a welding platform (110) provided on the frame (100), a first electrode head (120) provided on the welding platform (110), and a second electrode head (130) provided on the frame (100) at a position directly opposite to the first electrode head (120); and The positioning device (200) according to any one of claims 1 to 6, wherein the mounting substrate (210) is fixed to the welding platform (110), and the first electrode head (120) is located at the center of the through hole.

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