Spot welding limit device for main cross beam of urban railway vehicle

Abstract

The present invention provides a spot welding limit device for the main beam of an urban railway vehicle. The present invention includes a device body and a movable baffle plate arranged on the device body, the device body can be installed on a fixed spot welding machine, the movable baffle plate can move in a predetermined path, so that it can be kept in the upper and lower gears when needed, and the device body is provided with an upper positioning block and a lower positioning block for limiting the movable baffle plate to be in the specific position of the upper and lower gears, and the upper and lower gears are respectively used for reverse welding and front welding of the main beam, and after the front and reverse sides of the main beam abut against the movable baffle plate, the welding head of the fixed spot welding machine is limited to the required spot welding size position. The present invention minimizes the volume of the device itself in the form of a single front baffle plate switching between two gears, so as to achieve the function of being able to place the present invention inside the fixed spot welding machine to limit the welding points of the main beam.

Description

Technical Field

[0001] The invention relates to the technical field of urban railway vehicle manufacturing, and in particular to a spot welding limiting device for a main cross beam of an urban railway vehicle. Background Art

[0002] In the process of manufacturing urban rail vehicles, the spot welding of the main beam is one of the processes. This step requires welding on both sides of the main beam. As the load-bearing component of the underframe of the urban rail vehicle, the main beam is 2.5 meters long and weighs about 40KG. Due to the structural characteristics of the main beam, a fixed spot welding machine is required for spot welding. During the working process, the main beam needs to be placed in the welding machine in both the positive and negative states for spot welding. The reserved space on the inside of the fixed welding machine is small, and the current is large when the main beam is welded, and the welding quality requirements are high. Traditional technical means such as setting a fixed baffle on the inside of the welding machine cannot guarantee the requirements of the two welding positions, and the metal baffle will also cause current reflux problems and affect the welding quality. Therefore, this welding process currently uses manual visual operation, and the main requirement for product appearance quality is whether the accurate position of each welding point can be ensured.

[0003] Specifically, Figure 1 As shown, Figure 1 The schematic diagram of the main beam 2 being placed in the spot welding area of ​​the fixed spot welding machine 1 in two welding states, the front side (left side of the figure) and the back side (right side of the figure). Since the space inside the fixed spot welding machine is relatively small, and the main beam in two welding states is too different in shape and size when placed in the welding machine, the traditional technical means of installing a single baffle plate inside the welding machine cannot simultaneously meet the limiting requirements of the two welding states. If the limiting method of frequently disassembling and exchanging the two baffle plates is adopted, the production speed will be seriously slowed down. Therefore, the currently used technology, such as Figure 2 As shown, before the main beam is placed in the fixed spot welding machine, the long welding point position lines are marked on both sides of the longitudinal position of the main beam in advance, and the position lines are aligned visually during welding.

[0004] There are more than 100 main beams in a train. The process of marking on both sides requires not only a lot of labor time, but also the main beams need to be lifted repeatedly, which puts a heavy burden on the operators. Due to the long length of the main beam, the marking work itself is difficult, which can easily cause deviations in the marking position, and the subsequent visual welding process naturally cannot be completed smoothly. According to production technical requirements, all welds should be in a straight line. However, there are about 20 welds on each main beam. The visual operation method is not only inefficient, but also has different levels of operation among different people. It is impossible to guarantee that each weld can be accurately placed on the weld position line, and the product appearance quality cannot be guaranteed. In summary, the current technical means not only cannot guarantee the appearance quality, but also have deficiencies in operability and operating efficiency. Summary of the invention

[0005] According to the technical problems raised above, a spot welding limit device for the main cross beam of a city railway vehicle is provided. The technical means adopted by the present invention are as follows:

[0006] A spot welding limit device for a main crossbeam of an urban railway vehicle comprises a device body and a movable baffle plate arranged on the device body, wherein the device body can be installed on a fixed spot welding machine, the movable baffle plate can move in a predetermined path so that it can be kept in an upper or lower gear position when needed, and an upper positioning block and a lower positioning block are provided on the device body for limiting the movable baffle plate to be in a specific position of the upper or lower gear position, the upper or lower gear position is used for reverse welding and front welding of the main crossbeam respectively, and after the front and reverse sides of the main crossbeam abut against the movable baffle plate, the welding head of the fixed spot welding machine is limited to a required spot welding size position.

[0007] Furthermore, the movable baffle includes a first front baffle, a second front baffle and an insulating pad disposed therebetween, and the three are connected to the front baffle movable rod via a third connecting bolt.

[0008] Furthermore, the movable baffle can move along a predetermined path based on a connecting rod, and the connecting rod is connected to the front baffle movable rod through a second connecting bolt. A first connecting bolt is provided on the device body, and the connecting rod includes a head end, a middle section and a tail end. The middle section is a slide structure, so that the connecting rod can slide along the first connecting bolt.

[0009] Furthermore, the upper positioning stopper is installed on the device body through an upper positioning stopper plate.

[0010] Furthermore, the lower positioning stopper is installed on the device body through a lower positioning baffle.

[0011] Furthermore, the device body includes two side panels and a bottom plate, both side panels are fixedly connected to the bottom plate, and the shapes and specifications of the two side panels are determined based on the inner size of the fixed spot welder and the upper and lower positions of the movable baffle.

[0012] The present invention has the following advantages:

[0013] 1. The present invention uses a single front baffle plate with two gears to switch between the two gears, thereby minimizing the volume of the device itself, so that the present invention can be placed inside a fixed spot welding machine to limit the welding points of the main beam.

[0014] 2. The front baffle plate fixes the upper gear and the lower gear through the upper and lower positioning baffles, and the two gears can be quickly switched to each other by the linkage rod.

[0015] 3. The device is connected to the inside of the fixed spot welding machine with bolts, and the front baffle has an insulation design to prevent the device itself and the welding machine from generating backflow and affecting the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 This is a schematic diagram of the main beam welding status, where the left side is front side welding and the right side is back side welding.

[0018] Figure 2 The invention is a welding method for welding point position line based on manual vision in the prior art.

[0019] Figure 3 It is a schematic diagram of the structure of the present invention.

[0020] Figure 4 This is a schematic diagram of the welding state of the main crossbeam using the present invention, wherein the left side is front side welding and the right side is back side welding.

[0021] Figure 5 It is a schematic diagram of the state of the present invention when welding the front side of the main cross beam, wherein the left side is a front view and the right side is a back view.

[0022] Figure 6 The figure is a conversion process diagram of the present invention when welding the front side of the main cross beam and then welding the back side of the main cross beam.

[0023] Figure 7 It is a schematic diagram of the state of the present invention when welding the front side of the main cross beam, wherein the left side is a front view and the right side is a back view.

[0024] Figure 8 It is a schematic diagram of rapid switching between two positions of the present invention.

[0025] In the figure: 1, fixed spot welding machine; 2, main crossbeam; 3, linkage rod; 4, first connecting bolt; 5, second connecting bolt; 6, positioning hole; 7, first front baffle; 8, insulating pad; 9, second front baffle; 10, third connecting bolt; 11, front baffle movable rod; 12, upper positioning baffle; 13, upper positioning block; 14, lower positioning block; 15, lower positioning baffle; DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Compared with the current visual welding technology, this embodiment provides a more direct and quick welding point positioning method. Specifically, Figure 3 As shown, the embodiment of the present invention discloses a spot welding limit device for the main cross beam of a city railway vehicle, which is a device that can accurately limit the spot welding requirements of the front and back sides of the main cross beam in a limited and narrow space inside a fixed electric welding machine. Specifically, it includes a device body and a movable baffle plate arranged on the device body, the device body can be installed on a fixed spot welding machine 1, and the movable baffle plate can move along a predetermined path so that it can be kept in a fixed position as needed. Figure 4 The upper and lower gears shown in the figure, the device body is provided with an upper positioning block 13 and a lower positioning block 14 for limiting the movable baffle to the specific position of the upper and lower gears, and the upper and lower gears are respectively used for reverse welding and front welding of the main beam. After the front and reverse sides of the main beam abut against the movable baffle, the welding head of the fixed spot welding machine is limited to the required spot welding size position. Through the technical solution disclosed in this embodiment, the cumbersome marking steps can be eliminated, the labor intensity of the operator can be reduced, and the production rhythm can be accelerated. At the same time, the operation differences caused by different operators are eliminated, the accurate position of each welding point is guaranteed, and the appearance quality of the product is improved.

[0028] As a preferred embodiment, the movable baffle includes a first front baffle 7, a second front baffle 9 and an insulating pad 8 disposed therebetween, and the three are connected to the front baffle movable rod 11 by a third connecting bolt 10. The front baffle is a three-layer structure, the front and rear layers are made of metal material, which can ensure the firmness of the device, and the middle layer is an insulating pad, which can prevent the current during welding from flowing into the device through the front baffle and forming a backflow with the fixed spot welder below, thereby affecting the welding quality.

[0029] The movable baffle can move in a predetermined path based on the connecting rod 3, and the connecting rod 3 is connected to the front baffle movable rod 11 through the second connecting bolt 5. The device body is provided with a first connecting bolt, and the connecting rod includes a head end, a middle section and a tail end. The head end is in a form that is easy to move, and the middle section is a slide structure, so that the connecting rod can slide along the first connecting bolt 4, and the tail end is connected to the second connecting bolt 5.

[0030] The upper positioning stopper 13 is installed on the device body through the upper positioning baffle plate 12 .

[0031] The lower positioning stopper 14 is installed on the device body through the lower positioning baffle 15 .

[0032] The device body includes two side panels and a bottom plate, both side panels are fixedly connected to the bottom plate, the bottom plate is provided with a positioning hole 6 for installation on a fixed spot welding machine, and the shape and specification of the two side panels are determined based on the inner size of the fixed spot welding machine and the upper and lower gears of the movable baffle. In this embodiment, the main crossbeam is in the shape of a C-shaped steel and an angle steel extending from one side. The front welding referred to in this embodiment refers to the welding of the edge of the C-shaped steel with the angle steel, and the reverse welding refers to the welding of the edge of the C-shaped steel without the angle steel. Therefore, in order to save the material and weight of the side panel, the shape of the side panel is a structure with a small upper part and a large lower part. The setting positions of the upper positioning block 13 and the lower positioning block 14 are also determined based on the specifications of the main crossbeam to be welded. The upper positioning block is set at the rear position of the upper side panel, and the lower positioning block is set at the rear position of the lower side panel.

[0033] The specific limiting method of this embodiment is as follows:

[0034] like Figure 5 As shown, during operation, the device is connected to the inner side of the fixed spot welding machine through the positioning hole at the bottom. When welding is required on the front side of the main beam, the front baffle is placed in the lower position. At this time, the movable rod of the front baffle is locked in position by the lower positioning baffle, so that the front baffle cannot move further backward, thereby limiting the main beam in front and accurately limiting the welding head of the welding machine to the required spot welding size position to meet the spot welding operation requirements.

[0035] When welding the reverse side of the main beam is required, Figure 6 As shown, the front baffle needs to be switched from the lower gear to the upper gear. At this time, the linkage rod is pushed backwards, and the front baffle movable rod is pushed out from the lower gear under the action of the linkage rod. Then, under the traction of the linkage rod, the front baffle is pulled until the upper positioning block and the upper positioning baffle are fixed, completing the switch to the upper gear. At this time, the spot welding operation requirements on the back of the main beam can be met.

[0036] Specifically, Figure 7 As shown, when welding on the back side of the main beam, the front baffle of the device is placed on the upper stop. At this time, the front baffle can resist the side position of the back side of the main beam, so that the welding head position of the welding machine is limited to the size position required for the back side welding.

[0037] In this welding operation, the relative position of the welding head and the main beam is restricted. The position of the weld point is no longer affected by the marking quality and the operator's visual operation level. This ensures that all weld points are in the same straight line, ensures the product appearance quality, and can significantly improve work efficiency.

[0038] In actual operation, when you need to switch from the upper gear to the lower gear, pull the front baffle forward, then push the linkage rod to drive the front baffle back to the lower gear position and fix it. Figure 8 As shown, during the process of switching between the two gears, the linkage rod and the slide portion thereon are responsible for guiding the position of the front baffle, so that the operator does not need to visually align the positions of the upper and lower gears. Under the guidance of the linkage rod slide, the switching between the two positions can be completed quickly and accurately.

[0039] After replacing the existing technology, the present invention will improve the quality and efficiency of the spot welding operation of the main beams of urban railway vehicles. Compared with the existing technology, the present invention can eliminate the marking time of about one minute for each main beam and shorten the visual welding time of each main beam by two minutes. Based on 120 main beams in a train, it can save 6 hours of work, and based on 400 trains per year, it can save 2,400 hours of work. It saves 240,000 yuan in labor costs. At the same time, it reduces the operator's operation of lifting the main beam, improves the accuracy of the welding point, and improves product quality.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A spot welding limit device for the main cross beam of a city railway vehicle, characterized in that: The invention comprises a device body and a movable baffle plate arranged on the device body, wherein the device body can be installed on a fixed spot welding machine, the movable baffle plate can move along a predetermined path so that it can be kept in an upper or lower gear position when needed, and an upper positioning block and a lower positioning block are arranged on the device body for limiting the movable baffle plate to be in a specific position of the upper or lower gear position, and the upper or lower gear position is used for reverse welding and front welding of the main beam respectively, and after the front and reverse surfaces of the main beam abut against the movable baffle plate, the welding head of the fixed spot welding machine is limited to a required spot welding size position; The movable baffle comprises a first front baffle, a second front baffle and an insulating pad disposed therebetween, the three being connected to the front baffle movable rod via a third connecting bolt; The movable baffle can move along a predetermined path based on a connecting rod, and the connecting rod is connected to the front baffle movable rod through a second connecting bolt. A first connecting bolt is provided on the device body, and the connecting rod includes a head end, a middle section and a tail end. The middle section is a slide structure, so that the connecting rod can slide along the first connecting bolt; the tail end is connected to the second connecting bolt.

2. The spot welding limit device for the main cross beam of a city railway vehicle according to claim 1, characterized in that: The upper positioning stopper is installed on the device body through an upper positioning stopper plate.

3. The spot welding limit device for the main cross beam of a city railway vehicle according to claim 1, characterized in that: The lower positioning stopper is installed on the device body through a lower positioning stopper plate.

4. The spot welding limit device for the main cross beam of a city railway vehicle according to claim 1, characterized in that: The device body comprises two side panels and a bottom plate, both side panels are fixedly connected to the bottom plate, and the shapes and specifications of the two side panels are determined based on the inner size of the fixed spot welder and the upper and lower positions of the movable baffle.

5. The spot welding limit device for the main cross beam of a city railway vehicle according to claim 1, characterized in that: The first front baffle plate and the second front baffle plate are made of metal.

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