Battery tray frame sleeve joint robot welding tool

Abstract

According to the battery tray frame sleeve joint robot welding tool, sleeve joints are placed in step through holes in the two sides of the tool, a pull welding device is arranged below the step through holes, the pull welding device comprises an air cylinder, a piston rod and a pull welding bolt connected with the end of the piston rod, and the head of the pull welding bolt is of a double-step structure; the diameter of the first step is larger than that of the through hole of the sleeve joint, the diameter of the second step is equal to that of the through hole of the sleeve joint, and the diameter of the third step is smaller than that of the small hole of the step through hole. The pull welding device is specially used for welding and fixing the tray sleeve joint, robot welding is carried out while the pull welding device is used for applying pull force to the sleeve joint, and the situations that the welding position of the sleeve joint is inaccurate and the bottom end face is not attached to the bottom face of a stepped hole due to welding heating deformation are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile component manufacturing, in particular to a robot welding tool for a battery tray frame sleeve joint. Background Art

[0002] In recent years, new energy electric vehicles have gradually replaced fuel vehicles and become a growing type of vehicle. The power battery in an electric vehicle is its electrical energy storage component and is a core component in the entire vehicle. The power battery module is carried by the battery tray, which is then connected to the vehicle chassis to form a sturdy load-bearing body. As an important structural component, the battery tray is basically made of aluminum alloy materials for lightweight requirements. Most of the existing aluminum alloy battery trays are connected and combined using aluminum alloy profiles. The hollow aluminum alloy profiles have the advantages of small mass and strong load-bearing capacity. Utilizing its variable hollow structure, the ends are overlapped or mortise and tenoned to form a longitudinal and transverse frame load-bearing structure for the battery tray.

[0003] The battery tray frame needs to be fixed to the vehicle chassis by a number of threaded fasteners, so a number of sleeve joints with threaded holes need to be embedded in the step through holes on the tray frame and fully welded and fixed. Traditional manual welding is time-consuming and labor-intensive, so the use of automatic manipulator welding is the only choice. During the sleeve joint welding process, the upper end surface of the sleeve joint and the upper end surface of the tray frame need to be on the same horizontal plane to meet the welding requirements and not affect the subsequent assembly of the battery tray. However, during the welding process, due to thermal deformation caused by the frame welding, the bottom surface of the sleeve joint often cannot fit with the step surface of the step through hole during the welding process, causing the upper end surface of the sleeve joint after welding to be higher than the tray frame, and there is a gap between the bottom surface of the sleeve joint and the frame profile. Under long-term and severe vibration of the vehicle, the welding point of the sleeve joint cracks and desolders, causing the tray to separate from the vehicle chassis, seriously affecting the safety of vehicle driving. Summary of the invention

[0004] In view of the above problems, the utility model provides a robot welding tool for the sleeve joint of the frame of a battery tray, which is specially used for the welding and fixation of the tray sleeve joint. The robot welding is performed while applying tension to the sleeve joint by using a pulling welding device, so as to avoid the situation where the welding heat and deformation lead to inaccurate welding position of the sleeve joint and the bottom end surface does not fit the bottom surface of the step hole.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A battery tray frame sleeve joint robot welding tool, sleeve joints are placed in the step through holes on both sides of the tool, a pull welding device is arranged below the step through hole, the pull welding device includes a cylinder and a piston rod, and a pull welding bolt connected to the end of the piston rod, the pull welding bolt head is a double-step structure, the first step diameter is larger than the sleeve joint through hole diameter, the second step diameter is equal to the sleeve joint through hole diameter, and the third step diameter is smaller than the step through hole small hole diameter.

[0007] The first step structure of the pull welding bolt is used to clamp the upper end face of the sleeve joint and apply tension; the second step structure is used for guidance, so that the verticality of the pull welding bolt is consistent with the verticality of the inner hole of the sleeve joint, and the downward pulling force will not be offset; the third step is used to pass through the sleeve joint and connect to the cylinder piston rod below. During the welding process, the cylinder always applies tension to the sleeve joint through the pull welding bolt, so that the sleeve joint is always close to the bottom surface of the step through hole. The welded sleeve joint is tightly connected to the pallet frame without any gaps.

[0008] The piston rod end is provided with a connector, the other end of the connector is connected to a bolt sleeve, the upper end of the bolt sleeve is sleeved with the lower end of the pull welding bolt, through holes are arranged at corresponding positions of the bolt sleeve and the pull welding bolt, and a plug is horizontally inserted into the through hole to fix the pull welding bolt.

[0009] The welding plug and the cylinder piston rod can be separated and combined by freely inserting and pulling out the plug, which is convenient to operate and reliable to fix.

[0010] A guide frame is arranged outside the bolt sleeve and is fixed to the cylinder body through two connecting rods on both sides, and its function is to further ensure that the movement direction of the pull welding bolt is consistent with the movement direction of the cylinder piston rod to prevent oblique pulling.

[0011] Several welding clamps are arranged at the step holes on both sides of the tooling. The welding clamps include a cylinder quick clamp and a pressure plate installed on the clamp. The arc notch position of the pressure plate matches the position of the sleeve joint. In addition to clamping and fixing the battery tray, it also prevents the high temperature deformation of the profile surface at the welding position.

[0012] A plurality of tray clamps are arranged at both ends of the tooling. The tray clamps include a cylinder quick clamp and a pressing block installed on the clamp head, which plays the role of pressing and fixing the battery tray.

[0013] The welding process of the sleeve joint includes the following steps:

[0014] Place the pallet on the fixture and insert a socket fitting into each step through hole;

[0015] Pass the lower part of the pull welding bolt through the sleeve joint through hole and the step through hole, and enter the inner hole of the bolt sleeve, and align the pull welding bolt through hole with the side through hole of the bolt sleeve;

[0016] Pass the plug through the side hole of the bolt sleeve and the lower through hole of the pull welding bolt to fix the pull welding bolt;

[0017] The cylinders of the welding clamp and the tray clamp press down to clamp the battery tray, and the cylinder of the pull welding device pulls down the welding bolt to tighten the sleeve joint;

[0018] The robot welds and fixes each sleeve joint.

[0019] Advantages of utility models:

[0020] 1. The utility model tool is specially used for welding the sleeve joint of the battery tray. The pulling welding device is used to apply tension to the sleeve joint while performing robot welding, so as to avoid the situation that the welding heat deformation leads to inaccurate welding position of the sleeve joint and the bottom end surface does not fit the bottom surface of the step hole.

[0021] 2. The utility model has a simple structure, reliable operation and convenient maintenance.

[0022] 3. The utility model has extremely low technical requirements for operators, and any operator can start operation after simple training. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the working state structure diagram of the utility model; (including battery tray)

[0024] Figure 2 for Figure 1 The enlarged structure diagram of position Ⅰ in the middle;

[0025] Figure 3 This is the appearance structure diagram of the battery tray;

[0026] Figure 4 This is a schematic diagram of the tooling structure; (excluding the battery tray)

[0027] Figure 5 This is the internal cross-sectional structure diagram of the pull welding device in working state;

[0028] Figure 6 This is the appearance structure diagram of the pull welding device;

[0029] Figure 7 This is the appearance structure diagram of the pull welding bolt parts;

[0030] The serial numbers in the figure are marked as: 11-welding clamp; 12-tray clamp; 2-pull welding device; 211-cylinder; 212-piston rod; 213-connector; 221-pull welding bolt; 222-plug bolt; 223-bolt sleeve; 224-guide frame; 3-sleeve joint; 4-battery tray; 41-step through hole. DETAILED DESCRIPTION Example 1

[0031] A battery tray frame sleeve joint robot welding tool, sleeve joints 3 are placed in the step through holes 41 on both sides of the tool, a pull welding device 2 is arranged below the step through hole 41, the pull welding device 2 includes a cylinder 211 and a piston rod 212, and a pull welding bolt 221 connected to the end of the piston rod 212, the head of the pull welding bolt 221 is a double-step structure, the first step diameter is larger than the sleeve joint 3 through hole diameter, the second step diameter is equal to the sleeve joint 3 through hole diameter, and the third step diameter is smaller than the small hole diameter of the step through hole 41.

[0032] The end of the piston rod 212 is installed with a connector 213, and the other end of the connector 213 is connected to a bolt sleeve 223. The upper end of the bolt sleeve 223 is sleeved with the lower end of the pull welding bolt 221. Through holes are set at corresponding positions of the bolt sleeve 223 and the pull welding bolt 221. The plug 222 is horizontally inserted into the through hole to fix the pull welding bolt 221.

[0033] A guide frame 224 is disposed outside the bolt sleeve 223 .

[0034] A plurality of welding clamps 11 are arranged at the step through holes 41 on both sides of the tooling. The welding clamps 11 include a cylinder quick clamp and a pressure plate installed on the chuck. The arc notch position of the pressure plate matches the position of the sleeve joint 3.

[0035] A plurality of pallet clamps 12 are arranged at both ends of the tooling. The pallet clamp 12 comprises a cylinder quick clamp and a pressing block installed on a clamping head.

Claims

1. A battery tray frame sleeve joint robot welding tool, characterized in that: The sleeve joint (3) is placed in the step through holes (41) on both sides of the tooling, and a pull welding device (2) is arranged below the step through holes (41). The pull welding device (2) comprises a cylinder (211) and a piston rod (212), and a pull welding bolt (221) connected to the end of the piston rod (212). The head of the pull welding bolt (221) is a double-step structure, the diameter of the first step is larger than the diameter of the through hole of the sleeve joint (3), the diameter of the second step is equal to the diameter of the through hole of the sleeve joint (3), and the diameter of the third step is smaller than the diameter of the small hole of the step through hole (41).

2. According to claim 1, the battery tray frame sleeve joint robot welding tool is characterized in that: A connector (213) is installed at the end of the piston rod (212), and the other end of the connector (213) is connected to a bolt sleeve (223). The upper end of the bolt sleeve (223) is sleeved with the lower end of the pull welding bolt (221). Through holes are provided at corresponding positions of the bolt sleeve (223) and the pull welding bolt (221), and the bolt (222) is horizontally inserted into the through hole to fix the pull welding bolt (221).

3. According to claim 2, the battery tray frame sleeve joint robot welding tool is characterized in that: A guide frame (224) is arranged outside the bolt sleeve (223).

4. According to claim 1, the battery tray frame sleeve joint robot welding tool is characterized in that: A plurality of welding clamps (11) are arranged at the stepped through holes (41) on both sides of the tooling. The welding clamps (11) include a cylinder quick clamp and a pressure plate installed on the clamp head. The position of the arc notch of the pressure plate matches the position of the sleeve joint (3).

5. According to claim 1, the battery tray frame sleeve joint robot welding tool is characterized in that: A plurality of pallet clamps (12) are arranged at both ends of the tooling, and the pallet clamps (12) comprise cylinder quick clamps and pressure blocks installed on the clamping heads.

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