Frame corner part welding clamp and welding method

Abstract

The invention provides a frame corner part welding fixture and a welding method, and belongs to the technical field of welding fixtures, the fixture is characterized in that a rotating mechanism is mounted on a base, and a first fixture assembly is mounted on the rotating mechanism and used for clamping a first workpiece; and a second clamp assembly for clamping a second workpiece is mounted on the base. The working process comprises the steps that firstly, the two clamp assemblies are used for clamping specific parts of two workpieces correspondingly, and stable clamping is guaranteed; and then the first clamp assembly is driven by the rotating mechanism to rotate, and meanwhile the first workpiece is clamped to rotate relative to the second workpiece till the needed welding angle is achieved. By means of the mode, the welding angle between the two workpieces can be freely adjusted under the condition that it is guaranteed that the workpieces are stably clamped. Various welding tasks can be completed by one fixture equipment, so that the cost for preparing fixtures with various welding angles is saved; in the welding process, due to the fact that the clamping part of the workpiece does not need to be replaced, the phenomenon that the workpiece falls off due to unstable clamping in the welding process can be avoided.

Description

Technical Field

[0001] The invention generally relates to the technical field of welding fixtures, and in particular to a welding fixture and a welding method for a frame corner part. Background Art

[0002] The existing automobile frame has a variety of parts. Some parts have corner structures and are difficult to produce directly. They need to be produced separately to obtain two parts without corner structures and then welded. During the welding process, the two parts have a corresponding welding angle, and the desired finished parts can be obtained after welding is completed.

[0003] Since the existing welding fixture can only clamp the fixed part of the workpiece at a fixed position, generally under the same circumstances, the two workpieces are parallel or perpendicular to each other, that is, the welding angle is 180 degrees or 90 degrees. When it is necessary to weld a workpiece twice, and the welding angles are different between the two welding processes, it is necessary to replace the corresponding fixture, or replace the clamping part of the fixture on the workpiece.

[0004] The above situation has the following defects: The method of replacing the corresponding fixture requires the preparation of multiple types of fixtures, which is costly; the method of replacing the clamping part of the fixture on the workpiece is complicated and tedious to operate, and is likely to cause unstable clamping, which may cause the workpiece to fall off during the welding process. Summary of the invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a frame corner parts welding fixture and a welding method.

[0006] On the one hand, the present invention provides a fixture that can stably clamp a workpiece and adjust the welding angle, which can adapt to a variety of welding angles without changing the clamping position of the workpiece. Specifically, it is a frame corner parts welding fixture, comprising: Base; A rotating mechanism, wherein the rotating mechanism is mounted on the base; a first clamp assembly, the first clamp assembly being mounted on the rotating mechanism and used for clamping a first workpiece; a second clamp assembly, the second clamp assembly being rotatably mounted on the base and used for clamping a second workpiece and adjusting a relative posture between the first workpiece and the second workpiece; The rotating mechanism is used to drive the first fixture assembly and the first workpiece to rotate, and adjust the welding angle and the relative posture between the first workpiece and the second workpiece; the rotating axis of the rotating mechanism is parallel to the horizontal direction; A detection component is installed on the base and is used to detect the relative posture between the first workpiece and the second workpiece.

[0007] According to the technical solution provided by the present invention, the rotating mechanism includes: A first driving device, wherein the first driving device is fixedly mounted on the base; A connecting member, one end of which is fixedly connected to the driving shaft of the first driving device; the first clamp assembly is fixedly connected to the other end of the connecting member; and the first driving device is used to drive the connecting member and the first clamp assembly to rotate.

[0008] According to the technical solution provided by the present invention, the first clamp assembly includes: a second driving device, the second driving device being mounted on the rotating mechanism; A first clamp is installed on the driving end of the second driving device; the first clamp is used to clamp the first workpiece; the second driving device is used to drive the first clamp and the first workpiece to extend and retract along the extension direction of the driving end of the second driving device.

[0009] According to the technical solution provided by the present invention, the first clamp includes: a first housing, the first housing being mounted on a driving end of the second driving device; Two clamping assemblies, both of which can be slidably mounted on the first shell, and one end of the two clamping assemblies protrudes from the first shell, and are used to clamp the first workpiece; The transmission mechanism is installed in the first housing and is connected to the two clamping assemblies at the same time, and is used to drive the two clamping assemblies to move closer to or away from each other to clamp or release the first workpiece.

[0010] According to the technical solution provided by the present invention, the clamping assembly includes: A first clamping member, the first clamping member is slidably mounted on the first housing along a first direction, and one end of the first clamping member protrudes out of the first housing; A first transmission member, the first transmission member is fixedly mounted on one end of the first clamping member located in the first housing; a second transmission member, the second transmission member being slidably connected to the first transmission member along a first direction; a first rack, the first rack being fixedly mounted on the second transmission member along a first direction and connected to the transmission mechanism, and being used for driving the second transmission member to slide relative to the first transmission member under the action of the transmission mechanism; a first elastic member, wherein one end of the first elastic member is connected to the first transmission member, and the other end of the first elastic member is connected to the second transmission member; The two clamping assemblies have a first state and a second state; When in the first state, the two first clamping members of the two clamping assemblies are away from each other, and the first elastic member is in a natural state; When in the second state, the two first clamping members of the two clamping assemblies are close to each other and respectively abut against surfaces on both sides of the first workpiece; and the first elastic member is in a stressed state.

[0011] According to the technical solution provided by the present invention, the first transmission member has a support column extending along the first direction, which is used to abut against the second transmission member; When the two clamping assemblies are in the first state and the second state, the support column and the second transmission member are separated from each other; The two clamping assemblies also have a third state; When in the third state, the two first clamping members of the two clamping assemblies are close to each other and respectively abut against the surfaces on both sides of the first workpiece; the first elastic member is in a stressed state; the support column abuts against the second transmission member to prevent the second transmission member from continuing to approach the first transmission member along the first direction.

[0012] According to the technical solution provided by the present invention, the transmission mechanism includes: a third driving device, the third driving device being fixedly mounted in the first housing; a first gear, wherein the first gear is fixedly connected to a driving shaft of the third driving device; A reduction gear set is installed in the first housing and meshes with the first rack and the first gear respectively.

[0013] According to the technical solution provided by the present invention, a first electrode is installed on the first clamp assembly, which is used to electrically connect with the first workpiece when the first clamp assembly clamps the first workpiece; A second electrode is mounted on the second fixture assembly, and is used to electrically connect to the second workpiece when the second fixture assembly clamps the second workpiece; The first electrode and the second electrode are electrically connected to the positive and negative electrodes of the power supply assembly, respectively, and are used to detect whether the first workpiece and the second workpiece are in contact with each other.

[0014] On the other hand, the present invention further provides a method for welding a frame corner part, which is implemented based on the above-mentioned frame corner part welding fixture, and the welding method comprises: Clamping the first workpiece and the second workpiece on the first fixture assembly and the second fixture assembly, respectively; The rotating mechanism drives the first clamp assembly to rotate to an initial state; in the initial state, there is 180 degrees between the first workpiece and the second workpiece; The detection component detects the relative posture between the first workpiece and the second workpiece; Get welding angle; Calculating the rotation angle of the rotating mechanism according to the welding angle; According to the rotation angle and the relative posture, the rotation mechanism and the second clamp assembly are controlled to rotate respectively, so as to drive the first workpiece and the second workpiece to move to a state where the welding angle is clamped and the first workpiece and the second workpiece is in a welding posture; the welding posture is a relative posture required for welding the first workpiece and the second workpiece; The first fixture assembly and the second fixture assembly respectively drive the first workpiece and the second workpiece to move closer to each other until the power supply assembly detects that the first workpiece and the second workpiece are in contact with each other; The first workpiece and the second workpiece are welded.

[0015] According to the technical solution provided by the present invention, the first workpiece has a first front surface and a first back surface; the second workpiece has a second front surface and a second back surface; According to the rotation angle and the relative posture, the steps of controlling the rotation mechanism and the second clamp assembly to rotate respectively, driving the first workpiece and the second workpiece to move to a state where the welding angle is clamped and the welding posture is in progress include: When the relative posture is: the first front side of the first workpiece faces the detection component, and the second front side of the second workpiece faces the detection component, the rotating mechanism rotates forwardly by the rotation angle; When the relative posture is: the first front side of the first workpiece faces the detection assembly, and the second back side of the second workpiece faces the detection assembly, firstly control the second fixture assembly and the second workpiece to rotate 180 degrees with the vertical direction as the axis, and then control the rotating mechanism to rotate forwardly by the rotation angle; When the relative posture is: the first reverse side of the first workpiece faces the detection assembly, and the second front side of the second workpiece faces the detection assembly, firstly control the second fixture assembly and the second workpiece to rotate 180 degrees with the vertical direction as the axis, and then control the rotating mechanism to rotate in the opposite direction by the rotation angle; When the relative posture is: the first reverse side of the first workpiece faces the detection component, and the second reverse side of the second workpiece faces the detection component, the rotating mechanism rotates in the opposite direction of the rotation angle.

[0016] The beneficial effects of the present invention are: A rotating mechanism is installed on the base, and a first clamp assembly is installed on the rotating mechanism for clamping the first workpiece; a second clamp assembly for clamping the second workpiece is installed on the base. The working process is: first, two clamp assemblies are used to clamp specific parts of the first workpiece and the second workpiece respectively to ensure stable clamping; then the first clamp assembly rotates under the drive of the rotating mechanism, and at the same time, the first workpiece is clamped to rotate relative to the second workpiece until the required welding angle is reached. The above method can freely adjust the welding angle between the first workpiece and the second workpiece while ensuring stable clamping of the workpiece. Since one clamp device can complete various welding tasks, the cost of preparing clamps with multiple welding angles is saved; during the welding process, since there is no need to change the clamping part of the workpiece, the workpiece can be prevented from falling off due to unstable clamping during the welding process. At the same time, the detection component can also capture the image of the first workpiece and the second workpiece and identify the relative posture, and automatically adjust according to the current relative posture, so that the first workpiece and the second workpiece are in the welding posture required for welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 This is the main view of the welding fixture when the welding angle between the two workpieces is 90 degrees; Figure 2 This is the left view of the welding fixture when the welding angle between the two workpieces is 90 degrees; Figure 3 This is the main view of the welding fixture when the welding angle between the two workpieces is 180 degrees; Figure 4 This is the left view of the welding fixture when the welding angle between the two workpieces is 180 degrees; Figure 5 for Figure 2 A partial enlarged view of point B in the middle; Figure 6 is a schematic diagram of the internal structure of the first clamp; Figure 7 It is a partial enlarged view of the clamping assembly; Figure 8 is a schematic structural diagram of a first clamping member; Fig. 9 is a schematic structural diagram of a second transmission member; Fig.10 is another structural schematic diagram of the first clamping member; Fig.11 is a schematic diagram of the installation position of the first electrode on the first clamping member; Fig.12 is a schematic diagram of a first clamping member and a second clamping member; Fig.13 A circuit diagram of a power supply assembly; Fig.14 It is a structural schematic diagram of the rotating mechanism when it rotates in the reverse direction; Wherein: 1. base; 2. rotating mechanism; 3. first clamp assembly; 4. second clamp assembly; 5. first workpiece; 6. second workpiece; 7. first driving device; 8. connecting member; 9. second driving device; 10. first clamp; 11. first shell; 12. clamping assembly; 13. first clamping member; 14. first transmission member; 15. second transmission member; 16. first rack; 17. first elastic member; 18. support column; 19. limiting protrusion; 20. first gear; 21. reduction gear set; 22. first electrode; 23. second electrode; 24. ammeter; 25. protective resistor; 26. switch; 27. power supply; 28. fourth driving device; 29. ​​second clamp; 30. first slide rail; 31. second slide rail; 32. first groove; 33. second groove; 34. third slide rail; 35. third groove; 36. lifting platform; 37. camera; 38. rotating platform; 39. fifth driving device. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0019] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] Based on the defects described in the background technology, the present invention designs a frame corner parts welding fixture to solve the above technical problems. The specific structure and control scheme are as follows: Example 1 Please refer to Figure 1-5 , respectively, are different perspective views of a frame corner parts welding fixture provided by the present invention. Among them, Figure 1-2 They are the front view and left view of the welding fixture when the welding angle between the two workpieces is 90 degrees. Figure 3-4 They are the front view and left view of the welding fixture when the welding angle between the two workpieces is 180 degrees. Figure 5 for Figure 2 The partial enlarged view at B is a schematic diagram showing that the two clamping assemblies 12 drive the first workpiece 5 and the second workpiece 6 to abut against each other.

[0021] The present invention provides a frame corner parts welding fixture, comprising: Base 1; A rotating mechanism 2, wherein the rotating mechanism 2 is mounted on the base 1; A first clamp assembly 3, which is mounted on the rotating mechanism 2 and is used to clamp the first workpiece 5 and adjust the relative posture between the first workpiece 5 and the second workpiece 6; A second clamp assembly 4, the second clamp assembly 4 can be rotatably mounted on the base 1, and is used to clamp a second workpiece 6; the rotation axis of the second clamp assembly 4 is parallel to the vertical direction; The rotating mechanism 2 is used to drive the first fixture assembly 3 and the first workpiece 5 to rotate, and adjust the welding angle and relative posture between the first workpiece 5 and the second workpiece 6; the rotating axis of the rotating mechanism 2 is parallel to the horizontal direction; The detection component is installed on the base 1 and is used to detect the relative posture between the first workpiece 5 and the second workpiece 6.

[0022] Specifically, based on the above structural design: The base 1 is a platform structure, which is used to provide a mounting position for other components; The rotating mechanism 2 is installed on the base 1, and the rotating axis is parallel to the horizontal direction; The first clamp assembly 3 is installed on the rotating mechanism 2, and is used to clamp the first workpiece 5. Driven by the rotating mechanism 2, the first workpiece 5 is rotated by clamping the first workpiece 5. The second clamp assembly 4 is rotatably mounted on the base 1 , and the rotation axis is in the vertical direction, and is used to clamp the second workpiece 6 ; refer to Figure 1 and Figure 3 Since the extension direction of the first clamp assembly 3 is perpendicular to the axial direction of the rotating mechanism 2; the extension direction of the second clamp assembly 4 is parallel to its own axial direction (i.e., the vertical direction); therefore, when the rotating mechanism 2 rotates, the first clamp assembly 3 and the first workpiece 5 will rotate relative to the second workpiece 6 driven by the rotating mechanism 2, thereby realizing the function of adjusting the welding angle.

[0023] Therefore, the working process includes: Mount the first workpiece 5 and the second workpiece 6 on the first fixture assembly 3 and the second fixture assembly 4 respectively; The rotating mechanism 2 drives the first fixture assembly 3 and the first workpiece 5 to rotate to a desired welding angle; The second driving device 9 and the first clamp 10 drive the first workpiece 5 to approach the second workpiece 6 until the first workpiece 5 and the second workpiece 6 abut against each other; Perform welding process; The first clamp assembly 3 and the second clamp assembly 4 release the workpiece and remove the finished workpiece after welding.

[0024] In the scenarios to which the present invention is applicable, the following situations also exist: When the first workpiece 5 and the second workpiece 6 are welded, they not only need to be in a suitable relative position, but also need to be in a suitable relative posture, that is, the front and back surfaces of the first workpiece 5 and the second workpiece 6 need to be in a state suitable for welding. When the relative posture is not suitable, welding failure is likely to occur. When the staff sets the workpiece on the first fixture assembly 3 and the second fixture assembly 4, it is very likely that the front and back surfaces of the workpiece will be installed incorrectly. Generally, the clamping is performed again. However, this method requires additional manpower, and the time consumption for reinstallation is also difficult to estimate.

[0025] Therefore, it is necessary to detect the relative posture of the first workpiece 5 and the second workpiece 6, and control the movement of the frame corner parts welding fixture provided by the present invention accordingly according to the front and back conditions of the installation, so as to automatically adjust to a suitable welding posture.

[0026] Based on the above situation, the present invention can also realize the function of automatically detecting and automatically adjusting the relative posture of the first workpiece 5 and the second workpiece 6. The specific scheme is as follows: A detection assembly is installed on the base 1 for detecting the relative posture between the first workpiece 5 and the second workpiece 6. In this embodiment, when the first workpiece 5 and the second workpiece 6 are in a normal welding relative posture, and the second fixture assembly 4 and the second workpiece 6 are in a vertically arranged state (i.e. Figure 3 The surface close to the detection component is the front side of the workpiece, and the other side is the back side.

[0027] Specifically, the first workpiece 5 has a first front surface and a first back surface; the second workpiece 6 has a second front surface and a second back surface. Therefore, after being mounted on the first fixture assembly 3 or the second fixture assembly 4 (assuming that the second fixture assembly 4 extends in the vertical direction), the relative posture between the first workpiece 5 and the second workpiece 6 has four situations, including: Case 1: The first front side of the first workpiece 5 faces the detection assembly, and the second front side of the second workpiece 6 faces the detection assembly; this is the relative posture of normal welding; Case 2: The first front side of the first workpiece 5 faces the detection component, and the second back side of the second workpiece 6 faces the detection component; Case 3: The first reverse side of the first workpiece 5 faces the detection component, and the second front side of the second workpiece 6 faces the detection component; Case 4: The first reverse side of the first workpiece 5 faces the detection component, and the second reverse side of the second workpiece 6 faces the detection component.

[0028] According to the structural design of this embodiment, by controlling the forward / reverse rotation of the rotating mechanism 2 (forward rotation is Figure 3 Clockwise direction; reverse rotation is Figure 3The second fixture assembly 4 is controlled to rotate with the vertical direction as the axis to achieve the function of adjusting the relative posture between the first workpiece 5 and the second workpiece 6 (refer to Example 2 for the specific control steps).

[0029] In summary, based on the above-mentioned design, the present invention has the following advantages: Since the rotating mechanism 2 can adjust the welding angle between the first workpiece 5 and the second workpiece 6, there is no need to adjust the clamping position of the workpiece; in this way, the welding angle between the first workpiece 5 and the second workpiece 6 can be freely adjusted by the rotating mechanism 2 while ensuring stable clamping, thereby realizing the function of the same clamp adapting to multiple welding angles. Compared with the existing clamps, the welding clamp provided by the present invention has a higher degree of automation and is more convenient to operate.

[0030] At the same time, the solution provided by the present invention can also automatically detect the relative posture between the first workpiece 5 and the second workpiece 6 through the detection component, and make corresponding adjustments to put the first workpiece 5 and the second workpiece 6 in a relative posture suitable for welding, thereby eliminating the impact of human errors on the welding process and making the entire welding fixture more intelligent.

[0031] The specific design scheme of the present invention for each structure includes: (I) Structural design of rotating mechanism 2 The rotating mechanism 2 comprises: A first driving device 7, the first driving device 7 is fixedly mounted on the base 1; A connecting member 8, one end of which is fixedly connected to the driving shaft of the first driving device 7; the first clamp assembly 3 is fixedly connected to the other end of the connecting member 8; the first driving device 7 is used to drive the connecting member 8 and the first clamp assembly 3 to rotate.

[0032] Specifically, the first driving device 7 includes: a coaxially connected motor and an encoder, the motor is used to provide a rotational driving force, and the encoder detects the rotation angle of the motor, thereby conveniently controlling the motor to rotate to a corresponding angle, so that the required welding angle is clamped between the first workpiece 5 and the second workpiece 6.

[0033] The connecting member 8 is used to provide a mounting position for the first clamp assembly 3 , so that the first clamp assembly 3 can be mounted in a direction perpendicular to the rotation axis of the first driving device 7 .

[0034] (II) Structural design of the first fixture assembly 3 The first clamp assembly 3 comprises: A second driving device 9, the second driving device 9 is installed on the rotating mechanism 2; The first clamp 10 is installed on the driving end of the second driving device 9; the first clamp 10 is used to clamp the first workpiece 5; the second driving device 9 is used to drive the first clamp 10 and the first workpiece 5 to extend and retract along the extension direction of the driving end of the second driving device 9.

[0035] Specifically, the second driving device 9 is a telescopic cylinder, which is used to drive the first clamp 10 to move so as to approach the second workpiece 6 .

[0036] Further, refer to Figure 6-7 , the first fixture 10 comprises: A first housing 11, wherein the first housing 11 is mounted on the driving end of the second driving device 9 and has a mounting space therein; Two clamping assemblies 12, both of which can be slidably mounted on the first housing 11, and one end of the two clamping assemblies protrudes from the first housing 11, and are used to clamp the first workpiece 5; The transmission mechanism is installed in the installation space in the first housing 11 and is connected to the two clamping assemblies 12 at the same time, and is used to drive the two clamping assemblies 12 to move closer to or away from each other to clamp or release the first workpiece 5.

[0037] Further, refer to Figure 8-11 , the clamping assembly 12 comprises: The first clamping member 13 is slidably mounted on the first housing 11 along a first direction, and one end of the first clamping member 13 protrudes from the first housing 11; Figure 6 , the first direction is the direction of arrow C in the figure; A first transmission member 14, the first transmission member 14 is fixedly mounted on one end of the first clamping member 13 located inside the first housing 11; A second transmission member 15, the second transmission member 15 is slidably connected to the first transmission member 14 along a first direction; A first rack 16, which is fixedly mounted on the second transmission member 15 along a first direction and connected to the transmission mechanism, and is used to drive the second transmission member 15 to slide relative to the first transmission member 14 under the action of the transmission mechanism; A first elastic member 17, one end of the first elastic member 17 is connected to the first transmission member 14, and the other end of the first elastic member 17 is connected to the second transmission member 15; The two clamping assemblies 12 have a first state and a second state; When in the first state, the two first clamping members 13 of the two clamping assemblies 12 are away from each other, and the first elastic member 17 is in a natural state; In the second state, the two first clamping members 13 of the two clamping assemblies 12 are close to each other and respectively abut against the surfaces on both sides of the first workpiece 5; the first elastic member 17 is in a stressed state.

[0038] Furthermore, the first transmission member 14 has a support column 18 extending along the first direction, which is used to abut against the second transmission member 15; When the two clamping assemblies 12 are in the first state and the second state, the support column 18 is separated from the second transmission member 15; The two clamping assemblies 12 also have a third state; When in the third state, the two first clamping members 13 of the two clamping assemblies 12 are close to each other and respectively abut against the surfaces on both sides of the first workpiece 5; the first elastic member 17 is in a stressed state; the support column 18 abuts against the second transmission member 15, which is used to prevent the second transmission member 15 from continuing to approach the first transmission member 14 along the first direction.

[0039] Specifically, in order to stably clamp the workpiece, the first clamp 10 needs to clamp a specific part of the first workpiece 5 to clamp it stably. When clamping workpieces of different shapes, it is necessary to adjust the clamping part several times to observe whether it is stably clamped. In this process, it is necessary to repeatedly control the clamping and loosening of the two clamping components 12, which is very cumbersome.

[0040] The clamping assembly 12 designed in the present invention is provided with a first elastic member 17 (a spring in the present embodiment) between a first transmission member 14 and a second transmission member 15 which can slide relative to each other; when the clamping assembly 12 clamps the workpiece, it has a pre-clamping state (i.e., the second state), at which time it is possible to observe or test whether it can be clamped stably, and then adjust the position of the clamped workpiece according to the actual situation.

[0041] Therefore, when carrying out the above process, the working steps include: Control the two clamping assemblies 12 to be in a first state, and place the workpiece between the two first clamping members 13; The two clamping assemblies 12 are controlled to be in the second state, at which time only the elastic member 17 exerts a force, so that the two first clamping members 13 abut against the surfaces of both sides of the workpiece; Observe or test whether it can be stably clamped; When the workpiece cannot be stably clamped, the two first clamping members 13 are manually moved to further compress the first elastic member 17 and move away from each other, thereby creating a gap between the workpiece and the first clamping member 13, so that the clamping position can be changed; After the clamping part is replaced, the first clamping member 13 is released, and the first elastic member 13 drives the two first clamping members 13 to continue to abut against the surface of the workpiece; When stable clamping is possible, the clamping assembly 12 is controlled to be in the third state, and the support column 18 supports the second transmission member 15 to prevent relative sliding; in this state, the force transmitted from the transmission mechanism through the support column 18 directly acts on the surface of the workpiece, and the force at this time is significantly greater than the force of the first elastic member 17, thereby ensuring stable clamping.

[0042] Specifically, the process of loosening the workpiece is: directly controlling the two clamping assemblies 12 to be in the first state.

[0043] Furthermore, the first clamping member 13 is provided with a limiting protrusion 19 ; the limiting protrusion 19 is used to abut against a surface of the second transmission member 15 on a side away from the first transmission member 14 .

[0044] Specifically, in order to prevent the first clamping member 13 and the second transmission member 15 from derailing when sliding relative to each other, a limiting protrusion 19 is provided on the edge of the first clamping member 13 away from the first transmission member 14 along the first direction; the limiting protrusion 19 abuts against the second transmission member 15 for limiting.

[0045] Furthermore, the transmission mechanism comprises: A third driving device, the third driving device is fixedly installed in the first housing 11; A first gear 20, the first gear 20 is fixedly connected to a driving shaft of a third driving device; The reduction gear set 21 is installed in the first housing 11 and meshes with the first rack 16 and the first gear 20 respectively.

[0046] Specifically, the third driving device is a motor, Figure 6 Not shown in the figure, the driving shaft is fixedly connected to the first gear 20, and the first gear 20 is meshed with the reduction gear set 21 to realize transmission.

[0047] refer to Figure 6 The reduction gear set 21 includes a plurality of transmission gears, some of which have two coaxially fixedly connected parts, and the two parts have different radii. The driving shaft of the third driving device is the active end, which meshes with the part with a larger radius of the first transmission gear through the first gear 20, and the part with a smaller radius meshes with the part with a larger radius of the second transmission gear, and the part with a smaller radius of the second transmission gear meshes with the first rack 16 to achieve driving. Figure 6 The clamping assembly 12 at the lower middle part slides upward relative to the first housing 11 .

[0048] and Figure 6 The transmission method of the clamping assembly 12 at the lower middle part is similar. The transmission mechanism drives the upper clamping assembly 12 to slide in the following manner: an auxiliary gear is added to mesh with the two transmission gears to achieve the effect of sliding in the opposite direction.

[0049] Based on the above structural arrangement, the transmission mechanism can make the two clamping assemblies 12 slide in opposite directions, thereby achieving the functions of moving closer to each other to clamp the workpiece and moving away from each other to loosen the workpiece. Figure 6 In the embodiment, the first gear 20 rotates in the direction of arrow D, driving the two first clamping members 13 to move closer to each other; Figure 6The reverse rotation in the direction of the middle arrow drives the two first clamping members 13 to move away from each other.

[0050] Specifically, due to the above-mentioned meshing mode, the reduction gear set 21 has the following characteristics: The driving shaft of the third driving device needs to rotate at a larger angle. After being transmitted to the clamping assembly 12 through the reduction gear set 21, the two clamping assemblies 12 only move a small distance (the specific ratio is related to the radius of each gear of the reduction gear set 21). At the same time, the driving shaft of the third driving device provides a smaller torque, which can be converted into a larger force when transmitted to the first rack 16.

[0051] Based on the above characteristics of the reduction gear set 21, this method increases the clamping force and ensures stable clamping.

[0052] Specifically, refer to Figure 8-9 A first slide rail 30 arranged along a first direction is installed in the first housing 11 , and a first groove 32 opened along the first direction is provided on the first clamping member 13 , and the first slide rail 30 can be slidably arranged in the first groove 32 .

[0053] The first clamping member 13 is provided with a second slide rail 31, one end of which is fixedly connected to the first transmission member 14; the first transmission member 14 is provided with a third groove 35; the second transmission member 15 is provided with a third slide rail 34, and is provided with a second groove 33. The second slide rail 31 is slidably disposed in the second groove 33, and the third slide rail 34 is slidably disposed in the third groove 35.

[0054] In some embodiments, reference Figure 7 A through groove is provided in the middle of the first clamping member 13. When the shape of the workpiece is irregular, the raised portion of the workpiece can be set in the through groove. This method can make the clamp adapt to workpieces of more shapes and complete the clamping of the workpiece.

[0055] In some embodiments, a pressure sensor is provided at the end of the support column 18 away from the transmission member 14 to detect whether the support column 18 is in contact with the second transmission member 15 .

[0056] When the support column 18 is not in contact with the second transmission member 15 , the pressure detected by the pressure sensor is 0; when the support column 18 is in contact with the second transmission member 15 , the pressure value detected by the pressure sensor is not 0.

[0057] In some embodiments, due to the structural characteristics of the reduction gear set 21, the first gear 20 rotates at a relatively large angular velocity, and can only translate at a relatively slow speed when transmitted to the first rack 16. Therefore, the control process of switching the clamping assembly 12 to the third state includes: The third driving device drives the first gear 20 to rotate forward with rated power (such as Figure 6 Clockwise direction as indicated by the arrow in the middle); When the pressure sensor detects that the pressure value is not 0, the driving shaft of the third driving device is controlled to provide the first torque for the first gear 20; in this embodiment, the first torque is set to 0.1 times the rated torque.

[0058] The rated torque refers to the torque provided by the third drive device at the rated power.

[0059] Due to the structural characteristics of the reduction gear set 21, in the above control method, if the third driving device still outputs at the rated torque after the clamping assembly 12 is switched to the third state, the force transmitted to the workpiece will be too large, which may cause deformation of the workpiece.

[0060] Therefore, after the clamping assembly 12 is switched to the third state, a stable clamping effect can be achieved without destroying the shape of the workpiece by only outputting a smaller torque through the third driving device.

[0061] Specifically, the first torque is set by performing experimental measurements in advance and calculating the torque, including: First, place the workpiece between the two first clamping members 13; The clamping assembly 12 is driven to switch to the third state by the third driving device; Disconnecting the power supply of the third drive device so that it no longer provides torque; Simulating the welding action required in the welding process, while the pressure sensor detects the current pressure value to obtain a first pressure value; After obtaining the first pressure value, the second torque acting on the driving shaft of the third driving device is calculated according to the radius of each gear in the reduction gear set 21 and the radius 20 of the first gear; the first torque in the above scheme needs to be equal to the value of the second torque to ensure torque balance, and no shaking occurs between the two first clamping members 13 and the workpiece; The third driving device is then controlled to output the first torque to ensure torque balance.

[0062] (III) Structural design of the second fixture assembly 4 The second clamp assembly 4 comprises: The fourth driving device 28 is mounted on the rotating mechanism and is vertically arranged; the rotating mechanism is mounted on the base 1 and is used to drive the fourth driving device 28 to rotate with the vertical direction as the axis; A second clamp 29, which is mounted on the driving end of the fourth driving device 28; the second clamp 29 is used to clamp the second workpiece 6; The fourth driving device 28 is a telescopic cylinder. The second clamp 29 has the same internal structure design as the first clamp 10, and the process of clamping / releasing the second workpiece 6 by the second clamp 29 is the same as the process of clamping / releasing the first workpiece 5 by the first clamp 10, which will not be repeated here.

[0063] The fourth driving device 28 is used to drive the second clamp 29 and the second workpiece 6 to extend and retract in the vertical direction after the second clamp 29 clamps the second workpiece 6. When the welding angle is 90 degrees, it is used to make the welding end of the second workpiece 6 and the welding end of the first workpiece 5 face each other in the horizontal direction, so that the first workpiece 5 and the second workpiece 6 can abut against each other.

[0064] Wherein, the rotating mechanism comprises: A rotating table 38 rotatably mounted on the base 1; A fifth driving device 39 fixedly mounted on the base 1 is a motor in this embodiment, and a driving end of the motor is fixedly connected to the rotating table 38, and is used to drive the rotating table 38, the second fixture assembly 4 and the second workpiece 6 to rotate with the vertical direction as the axis; The second clamp assembly 4 is fixedly mounted on the rotating platform 38 , and is used to rotate with the vertical direction as the axis driven by the fifth driving device 39 .

[0065] The above structure realizes the function of controlling the second clamp assembly 4 and the second workpiece 6 to rotate with the vertical direction as the axis.

[0066] (IV) Structural design of detection components The detection components include: A lifting platform 36, the lifting platform 36 is installed on the base 1; The camera 37 is mounted on the free end of the lifting platform 36; the lifting platform 36 is used to drive the camera 37 to move in the vertical direction; the shooting direction of the camera 37 is toward the first workpiece 5 and the second workpiece 6, and is used to shoot images of the first workpiece 5 and the second workpiece 6; The processor is electrically connected to the camera 37 and is used to receive the image captured by the camera 37 and detect the relative posture between the first workpiece 5 and the second workpiece 6.

[0067] Among them, the YOLOv8 model is loaded in the processor (for a detailed introduction to the application process of the YOLOv8 model, please refer to the content in Example 2); after the camera 37 takes the image of the first workpiece 5 and the second workpiece 6, the image is input into the YOLOv8 model, and the relative posture of the first workpiece 5 and the second workpiece 6 is detected, and it is determined which of the situations 1-4 the relative posture of the first workpiece 5 and the second workpiece 6 in the image belongs to, so as to facilitate the control of the forward / reverse rotation of the rotating mechanism 2, and control the second clamp assembly 4 to rotate with the vertical direction as the axis, so as to realize the function of adjusting the relative posture of the first workpiece 5 and the second workpiece 6.

[0068] (V) Design of a scheme for detecting the abutment between the first workpiece 5 and the second workpiece 6 Specifically, in the process of the first clamp assembly 3 and the second clamp assembly 4 driving the first workpiece 5 and the second workpiece 6 to approach each other, it is not only necessary to adjust the first workpiece 5 and the second workpiece 6 to the required welding angle, but also to set the first workpiece 5 and the second workpiece 6 at a suitable relative position. If the relative distance between the first workpiece 5 and the second workpiece 6 is too far, welding cannot be completed; if the first clamp assembly 3 and the second clamp assembly 4 still drive the workpiece to move after the workpieces abut against each other, it may cause the workpieces to be deformed due to excessive force, directly causing the workpieces to be scrapped.

[0069] The manual control of the movement of the first clamp assembly 3 and the second clamp assembly 4 is highly random and difficult to adjust to a suitable relative position at one time; and if the operator is inexperienced, it is very easy to make operating errors that may damage the workpiece.

[0070] It should be noted that due to the different shapes of various workpieces, there is usually obvious obstruction when they abut against each other. Fig.12 In this case, it is difficult to distinguish whether the first workpiece 5 and the second workpiece 6 are in contact with each other through the image captured by the camera 37; therefore, it is not possible to capture the image by the camera and then input it into the YOLOv8 model to detect whether they are in contact with each other.

[0071] Based on the above situation, the solution designed by the present invention also includes: A first electrode 22 is mounted on the first clamp assembly 3 and is used to electrically connect to the first workpiece 5 when the first clamp assembly 3 clamps the first workpiece 5; A second electrode 23 is mounted on the second clamp assembly 4 and is used to electrically connect to the second workpiece 6 when the second clamp assembly 4 clamps the second workpiece 6; The first electrode 22 and the second electrode 23 are electrically connected to the positive and negative electrodes of the power supply assembly, respectively, and are used to detect whether the first workpiece 5 and the second workpiece 6 are in contact with each other.

[0072] In some embodiments, the first clamping member 13 is made of insulating material to avoid affecting the power supply component's detection of whether the workpiece is abutted.

[0073] Specifically, the first electrode 22 is mounted on the surface of the first clamp 13 close to the first workpiece 5, and the second electrode 23 is mounted on the surface of the clamp in the second fixture 29 close to the second workpiece 6. Both electrodes are connected to the circuit of the power supply assembly through wires.

[0074] When the first clamp 13 clamps the first workpiece 5 , the first electrode 22 abuts against the first workpiece 5 to achieve electrical connection; when the second clamp 29 clamps the second workpiece 6 , the second electrode 23 abuts against the second workpiece 6 to achieve electrical connection.

[0075] refer to Fig.13 Since the first workpiece 5 and the second workpiece 6 are made of metal and have conductive properties, when the first workpiece 5 and the second workpiece 6 approach and abut against each other in the direction of the arrows in the figure, the first workpiece 5 and the second workpiece 6 can be equivalent to resistors for current to pass through, and it can be determined that they are abutting against each other at this time.

[0076] In some embodiments, the first electrode 22 and the second electrode 23 only partially cover the surface of the first clamping member 13 connected to the workpiece on the side close to the workpiece. This method can ensure that there is a sufficient contact area between the first clamping member 13 and the workpiece, thereby increasing the maximum static friction during clamping and ensuring that the workpiece does not shake during clamping.

[0077] In some cases, the first electrode 22 and the second electrode 23 are respectively arranged near the edge of the through slot on the respective first clamping member 13. In other cases, the first electrode 22 and the second electrode 23 are respectively arranged near the edge of the respective first clamping member 13.

[0078] Further, refer to Fig.13 , the power supply components include: The detection circuit has a positive and a negative electrode, which are electrically connected to the first electrode 22 and the second electrode 23 respectively; The detection circuit includes: An ammeter 24, a protective resistor 25, a switch 26 and a power supply 27 connected in series; When the ammeter 24 detects the generation of current, it means that the first workpiece 5 and the second workpiece 6 are in contact with each other.

[0079] The power supply 27 can be a low voltage DC power supply of 1V to 5V, and the protection resistor 25 can be 100Ω to 1000Ω, which can ensure that after the entire power supply component is connected to the first workpiece 5 and the second workpiece 6, the current will not be too large to damage the workpieces.

[0080] The specific working method is: close the switch 26 in advance, the first clamp assembly 3 and the second clamp assembly 4 respectively drive the first workpiece 5 and the second workpiece 6 to approach each other, and when the ammeter 24 detects the generation of current, it is determined that the first workpiece 5 and the second workpiece 6 are abutting each other; at this time, the first clamp assembly 3 and the second clamp assembly 4 are controlled to drive the first workpiece 5 and the second workpiece 6 to stop relative movement, and disconnect the switch 26 of the power supply assembly.

[0081] After the above steps, the subsequent welding process can be carried out.

[0082] In some embodiments, the method of detecting and judging whether the clamping is stable is to detect by closing the switch 26 and then electrically connecting the first workpiece 5 and the second workpiece 6 with a wire. The specific principle includes: If the clamping is unstable, shaking occurs, and the contact point between the electrode and the workpiece changes, which in turn causes the resistance to change. The ammeter 24 can detect this change.

[0083] When the clamping is stable and shaking occurs, the resistance changes very little, and the current variation range is less than 10%, which means that the clamping is stable, and then the electrical connection between the wire and the workpiece is disconnected to proceed to the subsequent steps.

[0084] (VI) Working process of the welding fixture of the present invention The work process includes: Step 1: Use the first clamp 10 and the second clamp 29 to clamp the first workpiece 5 and the second workpiece 6 respectively; the first electrode 22 is electrically connected to the first workpiece 5, and the second electrode 23 is electrically connected to the second workpiece 6; Step 1 specifically includes: Step 1-1: Control the two clamping assemblies 12 to be in a first state, and place the workpiece between the two first clamping members 13; Step 1-2: Control the two clamping assemblies 12 to be in the second state, so that the two first clamping members 13 abut against the two side surfaces of the workpiece; Step 1-3: Observe or test whether it can be stably clamped; When the workpiece cannot be stably clamped, the two first clamping members 13 are manually moved to further compress the first elastic member 17 and move away from each other, thereby creating a gap between the workpiece and the first clamping member 13, so that the clamping position can be changed; After the clamping part is replaced, the first clamping member 13 is released, and the first elastic member 13 drives the two first clamping members 13 to continue to abut against the surface of the workpiece; When stable clamping is possible, the clamping assembly 12 is controlled to be in the third state, and the force transmitted by the transmission mechanism is directly applied to the surface of the workpiece through the support column 18 .

[0085] Step 2: The lifting platform 36 drives the camera 37 to move in the vertical direction to a position where the shooting direction faces the first workpiece 5 and the second workpiece 6; the rotating mechanism 2 drives the first clamp assembly 3 to rotate to the initial state; in the initial state, there is 180 degrees between the first workpiece 5 and the second workpiece 6; Step 3: The camera 37 captures the relative posture of the first workpiece 5 and the second workpiece 6, and uses the YOLOv8 model to recognize the relative posture; When the relative posture of the first workpiece 5 and the second workpiece 6 is situation 1, the rotating mechanism 2 drives the first fixture assembly 3 and the first workpiece 5 to rotate to a desired welding angle; When the relative posture of the first workpiece 5 and the second workpiece 6 is in situation 2-4, according to the rotation angle and the relative posture, the rotating mechanism 2 and the second clamp assembly 4 are controlled to rotate respectively, so as to drive the first workpiece 5 and the second workpiece 6 to move to a state where a welding angle is clamped and the workpiece is in a welding posture; Step 4: first close the switch 26, the second driving device 9 and the first clamp 10 drive the first workpiece 5 to move close to the second workpiece 6, the fourth driving device 28 and the second clamp 29 drive the second workpiece 6 to move close to the first workpiece 5 (there is no order of precedence for these steps, currently only for the purpose of placing the first workpiece 5 and the second workpiece 6 in a suitable relative welding position, when welding workpieces of different shapes, the order may be different), until the ammeter 24 detects the generation of current and stops moving; finally, open the switch 26; Step 5: Welding the first workpiece 5 and the second workpiece 6 to obtain a finished workpiece; Step 6: The first clamp 10 and the second clamp 29 loosen the first workpiece 5 and the second workpiece 6 respectively, and remove the finished workpieces.

[0086] The above steps can realize the welding process of various welding angles for the first workpiece 5 and the second workpiece 6. When the relative posture of the workpieces set on the fixture assembly is not suitable for direct welding, the welding fixture provided by the present invention can also automatically adjust the relative posture between the first workpiece 5 and the second workpiece 6.

[0087] Example 2 The present invention also provides a method for welding a frame corner part, which is implemented based on a frame corner part welding fixture of the above embodiment. The welding method comprises: Clamp the first workpiece 5 and the second workpiece 6 on the first fixture assembly 3 and the second fixture assembly 4 respectively; the specific process is the same as step 1; The rotating mechanism 2 drives the first clamp assembly 3 to rotate to the initial state; in the initial state, there is 180 degrees between the first workpiece 5 and the second workpiece 6; the first rotation to the state of 180 degrees is to make the surfaces of the first workpiece 5 and the second workpiece 6 appear in the field of view of the camera 37 at the same time, so as to realize the function of identifying the relative posture (front and back) of the first workpiece 5 and the second workpiece 6 with only one shot; The detection component detects the relative posture between the first workpiece 5 and the second workpiece 6. The specific process includes: the lifting platform 36 drives the camera 37 to move in the vertical direction to the position where the first workpiece 5 and the second workpiece 6 are in the field of view, and then takes a picture of the relative posture of the first workpiece 5 and the second workpiece 6, inputs it into the YOLOv8 model in the processor, and recognizes the relative posture of the first workpiece 5 and the second workpiece 6; Obtain welding angle; in this embodiment, it is manually input; The rotation angle of the rotating mechanism 2 is calculated according to the welding angle; in this embodiment, the rotation is firstly to 180 degrees, so if the first workpiece 5 and the second workpiece 6 are to be rotated to the welding angle required, the rotation angle of the rotating mechanism 2 is the difference between 180 degrees and the welding angle; when the welding angle is 180 degrees, the rotation angle is 0 degrees; when the welding angle is 90 degrees, the rotation angle is 90 degrees; According to the rotation angle and the relative posture, the rotating mechanism 2 and the second clamp assembly 4 are controlled to rotate respectively, so as to drive the first workpiece 5 and the second workpiece 6 to move to a state where a welding angle is clamped and the welding posture is in the state; the welding posture is the relative posture required for welding the first workpiece 5 and the second workpiece 6; The first fixture assembly 3 and the second fixture assembly 4 respectively drive the first workpiece 5 and the second workpiece 6 to move toward each other until the power supply assembly detects that the first workpiece 5 and the second workpiece 6 are in contact with each other; the specific process is the same as step 4, including closing the switch 26 in advance, and after the ammeter 24 detects the current generated, controlling the second drive device 9 and the fourth drive device 28 to stop moving, and then disconnecting the switch 26; After welding the first workpiece 5 and the second workpiece 6, the finished workpiece is finally removed.

[0088] Further, the first workpiece 5 has a first front surface and a first back surface; the second workpiece 6 has a second front surface and a second back surface; According to the rotation angle and the relative posture, the steps of controlling the rotating mechanism 2 and the second clamp assembly 4 to rotate respectively, driving the first workpiece 5 and the second workpiece 6 to move to a state where a welding angle is clamped and the welding posture is in place include: When the relative posture is: the first front side of the first workpiece 5 faces the detection assembly, and the second front side of the second workpiece 6 faces the detection assembly, the rotating mechanism 2 rotates in the positive direction by a rotation angle; When the relative posture is: the first front side of the first workpiece 5 faces the detection assembly, and the second back side of the second workpiece 6 faces the detection assembly, first control the second fixture assembly 4 and the second workpiece 6 to rotate 180 degrees with the vertical direction as the axis, and then control the rotating mechanism 2 to rotate forward by the rotation angle; When the relative posture is: the first reverse side of the first workpiece 5 faces the detection assembly, and the second front side of the second workpiece 6 faces the detection assembly, first control the second fixture assembly 4 and the second workpiece 6 to rotate 180 degrees with the vertical direction as the axis, and then control the rotating mechanism 2 to rotate in the opposite direction; When the relative posture is: the first reverse side of the first workpiece 5 faces the detection assembly, and the second reverse side of the second workpiece 6 faces the detection assembly, the rotating mechanism 2 rotates in the reverse direction by the rotation angle.

[0089] In this embodiment, the processor of the detection component is loaded with a YOLOv8 model for detecting the front and back surfaces of the first workpiece 5 and the second workpiece 6. According to the detection results of the front and back surfaces of the first workpiece 5 and the second workpiece 6, the rotating mechanism 2 and the fifth driving device 39 are respectively controlled to perform rotational motion, so as to achieve the effect of driving the first workpiece 5 and the second workpiece 6 to be at a suitable welding angle and a suitable relative posture.

[0090] Detailed introduction to the YOLOv8 model application process: Before using the YOLOv8 model, it is necessary to obtain a large amount of image data containing workpieces (1,000 images are selected in this embodiment), and then add labels to the image data to indicate whether the workpiece in the image is the front or back; then use the image data and the corresponding labels to train the YOLOv8 model. Finally, the trained YOLOv8 model can recognize the front and back of the workpiece.

[0091] During use, the first workpiece 5 and the second workpiece 6 are firstly placed on the first fixture assembly 3 and the second fixture assembly 4, respectively, and then the rotating mechanism 2 is controlled to drive the first fixture assembly 3 and the first workpiece 5 to rotate to a position parallel to the vertical direction; Then, the lifting platform 36 is controlled to drive the camera 37 to move in the vertical direction to the same height as the first workpiece 5 and the second workpiece 6, and the images of the first workpiece 5 and the second workpiece 6 are captured by the camera 37. The images are then input into the trained YOLOv8 model to obtain the detection results of the relative posture (front and back) of the first workpiece 5 and the second workpiece 6, including the cases 1-4 described in Example 1: Then the currently required welding angle is obtained, and the rotation angle of the rotating mechanism 2 is calculated; the rotation angle is equal to 180 degrees minus the welding angle; when the welding angle is 90 degrees, the rotation angle is 90 degrees; when the welding angle is 180 degrees, the rotation angle is 0 degrees.

[0092] Based on the above situation, the control scheme is as follows: For case 1: Rotating mechanism 2 forward ( Figure 1-4 The first workpiece 5 and the second workpiece 6 are controlled to abut against each other and then the welding process is performed; For situation 2, firstly control the fifth driving device 39 to drive the rotating table 38, the second clamp assembly 4 and the second workpiece 6 to rotate 180 degrees with the vertical direction as the axis, and then control the rotating mechanism 2 to rotate forwardly by the rotation angle, control the first workpiece 5 and the second workpiece 6 to abut against each other, and then perform the welding process; For situation 3, first control the fifth driving device 39 to drive the rotating table 38, the second fixture assembly 4 and the second workpiece 6 to rotate 180 degrees, and then control the rotating mechanism 2 to rotate in the opposite direction ( Figure 1-4The first workpiece 5 and the second workpiece 6 are controlled to abut against each other and then the welding process is performed; refer to Fig.14 Before the rotating mechanism 2 rotates in the opposite direction, the lifting platform 36 is controlled to drive the camera 37 to move downward in the vertical direction to avoid collision with the rotating mechanism 2; in order to avoid damage to the camera during welding, the camera 37 can be removed from the lifting platform 36 during welding; For situation 4, the rotating mechanism 2 rotates in the reverse direction by the rotation angle, and the first workpiece 5 and the second workpiece 6 are controlled to abut against each other, and then the welding process is performed.

[0093] It should be noted that when the welding angle is 180 degrees, the rotation angle is 0, and no rotation actually occurs. In case 1 and case 4, it can be considered that the rotation angle of the second clamp assembly 4 is also 0; when the welding angles are different, the above control methods do not conflict with each other.

[0094] Through the above-mentioned control method, the effect of automatically adjusting the relative posture of the first workpiece 5 and the second workpiece 6 can be achieved. The staff only needs to install the first workpiece 5 and the second workpiece 6 on the two fixtures respectively, and then input the required welding angle, and then wait for the frame corner part welding fixture provided by the present invention to automatically adjust the first workpiece 5 and the second workpiece 6 to a suitable welding angle and relative posture, and then complete the subsequent welding process.

[0095] Since the relative posture of the first workpiece 5 and the second workpiece 6 can be automatically adjusted, damage to the workpieces due to operational errors is avoided.

[0096] The above description is only a preferred embodiment of the present invention and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present invention is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present invention (but not limited to) to form a technical solution.

Claims

1. A welding fixture for frame corner parts, characterized in that: include: Base (1); A rotating mechanism (2), the rotating mechanism (2) being mounted on the base (1); a first clamp assembly (3), the first clamp assembly (3) being mounted on the rotating mechanism (2) and being used to clamp a first workpiece (5); a second clamp assembly (4), the second clamp assembly (4) being rotatably mounted on the base (1) and being used to clamp a second workpiece (6) and adjust the relative posture between the first workpiece (5) and the second workpiece (6); The rotating mechanism (2) is used to drive the first fixture assembly (3) and the first workpiece (5) to rotate, so as to adjust the welding angle and the relative posture between the first workpiece (5) and the second workpiece (6); The rotation axis of the rotating mechanism (2) is parallel to the horizontal direction; A detection component, the detection component is mounted on the base (1) and is used to detect the relative posture between the first workpiece (5) and the second workpiece (6).

2. A frame corner parts welding fixture according to claim 1, characterized in that: The rotating mechanism (2) comprises: A first driving device (7), wherein the first driving device (7) is fixedly mounted on the base (1); A connecting member (8), one end of the connecting member (8) being fixedly connected to the driving shaft of the first driving device (7); the first clamp assembly (3) being fixedly connected to the other end of the connecting member (8); and the first driving device (7) being used to drive the connecting member (8) and the first clamp assembly (3) to rotate.

3. A frame corner parts welding fixture according to claim 1, characterized in that: The first clamp assembly (3) comprises: a second driving device (9), the second driving device (9) being mounted on the rotating mechanism (2); A first clamp (10), the first clamp (10) being mounted on a driving end of the second driving device (9); the first clamp (10) being used to clamp the first workpiece (5); and the second driving device (9) being used to drive the first clamp (10) and the first workpiece (5) to extend and retract along a direction of extension and retraction of the driving end of the second driving device (9).

4. A frame corner parts welding fixture according to claim 3, characterized in that: The first clamp (10) comprises: A first housing (11), the first housing (11) being mounted on a driving end of the second driving device (9); Two clamping assemblies (12), both of which can be slidably mounted on the first shell (11), with one end protruding out of the first shell (11), and are used to clamp the first workpiece (5); A transmission mechanism, the transmission mechanism is installed in the first housing (11) and is simultaneously connected to the two clamping assemblies (12), and is used to drive the two clamping assemblies (12) to move closer to or farther from each other, so as to clamp or release the first workpiece (5).

5. A frame corner parts welding fixture according to claim 4, characterized in that: The clamping assembly (12) comprises: A first clamping member (13), the first clamping member (13) being slidably mounted on the first shell (11) along a first direction, and one end of the first clamping member (13) protruding out of the first shell (11); A first transmission member (14), the first transmission member (14) being fixedly mounted on one end of the first clamping member (13) located inside the first housing (11); a second transmission member (15), the second transmission member (15) being slidably connected to the first transmission member (14) along a first direction; a first rack (16), the first rack (16) being fixedly mounted on the second transmission member (15) along a first direction and connected to the transmission mechanism, and being used for driving the second transmission member (15) to slide relative to the first transmission member (14) under the action of the transmission mechanism; a first elastic member (17), one end of the first elastic member (17) being connected to the first transmission member (14), and the other end of the first elastic member (17) being connected to the second transmission member (15); The two clamping assemblies (12) have a first state and a second state; When in the first state, the two first clamping members (13) of the two clamping assemblies (12) are away from each other, and the first elastic member (17) is in a natural state; When in the second state, the two first clamping members (13) of the two clamping assemblies (12) are close to each other and respectively abut against surfaces on both sides of the first workpiece (5); the first elastic member (17) is in a stressed state; The first clamping member (13) also has a limiting protrusion (19); the limiting protrusion (19) is used to abut against a surface of the second transmission member (15) on a side away from the first transmission member (14).

6. A frame corner parts welding fixture according to claim 5, characterized in that: The first transmission member (14) has a support column (18) extending along a first direction and used for abutting against the second transmission member (15); When the two clamping assemblies (12) are in the first state and the second state, the support column (18) and the second transmission member (15) are separated from each other; The two clamping assemblies (12) also have a third state; When in the third state, the two first clamping members (13) of the two clamping assemblies (12) are close to each other and respectively abut against surfaces on both sides of the first workpiece (5); the first elastic member (17) is in a stressed state; and the support column (18) abuts against the second transmission member (15) to prevent the second transmission member (15) from continuing to approach the first transmission member (14) along the first direction.

7. A frame corner parts welding fixture according to claim 5, characterized in that: The transmission mechanism comprises: a third drive device, the third drive device being fixedly mounted in the first housing (11); A first gear (20), the first gear (20) being fixedly connected to a drive shaft of the third drive device; A reduction gear set (21), the reduction gear set (21) being mounted in the first housing (11) and meshing with the first rack (16) and the first gear (20) respectively.

8. The frame corner parts welding fixture according to claim 1, characterized in that: A first electrode (22) is mounted on the first clamp assembly (3) and is used to electrically connect to the first workpiece (5) when the first clamp assembly (3) clamps the first workpiece (5); A second electrode (23) is mounted on the second clamp assembly (4) and is used to electrically connect to the second workpiece (6) when the second clamp assembly (4) clamps the second workpiece (6); The first electrode (22) and the second electrode (23) are electrically connected to the positive and negative electrodes of the power supply component respectively, and are used to detect whether the first workpiece (5) and the second workpiece (6) are in abutment with each other.

9. A method for welding a frame corner part, implemented based on a frame corner part welding fixture according to any one of claims 1 to 8, characterized in that: The welding method comprises: Clamping the first workpiece (5) and the second workpiece (6) on the first clamp assembly (3) and the second clamp assembly (4) respectively; The rotating mechanism (2) drives the first clamp assembly (3) to rotate to an initial state; in the initial state, there is 180 degrees between the first workpiece (5) and the second workpiece (6); The detection component detects the relative posture between the first workpiece (5) and the second workpiece (6); Get welding angle; Calculating the rotation angle of the rotating mechanism (2) according to the welding angle; According to the rotation angle and the relative posture, the rotation mechanism (2) and the second clamp assembly (4) are controlled to rotate respectively, so as to drive the first workpiece (5) and the second workpiece (6) to move to a state where the welding angle is clamped and the welding posture is in place; the welding posture is a relative posture required for welding the first workpiece (5) and the second workpiece (6); The first clamp assembly (3) and the second clamp assembly (4) respectively drive the first workpiece (5) and the second workpiece (6) to move toward each other until the power supply assembly detects that the first workpiece (5) and the second workpiece (6) are in contact with each other; The first workpiece (5) and the second workpiece (6) are welded.

10. A method for welding a frame corner part according to claim 9, characterized in that: The first workpiece (5) has a first front surface and a first back surface; the second workpiece (6) has a second front surface and a second back surface; According to the rotation angle and the relative posture, the steps of controlling the rotation mechanism (2) and the second clamp assembly (4) to rotate respectively, driving the first workpiece (5) and the second workpiece (6) to move to a state where the welding angle is clamped and the welding posture is in place include: When the relative posture is: the first front side of the first workpiece (5) faces the detection component, and the second front side of the second workpiece (6) faces the detection component, the rotating mechanism (2) rotates in the positive direction by the rotation angle; When the relative posture is: the first front side of the first workpiece (5) faces the detection component, and the second back side of the second workpiece (6) faces the detection component, firstly control the second fixture component (4) and the second workpiece (6) to rotate 180 degrees with the vertical direction as the axis, and then control the rotating mechanism (2) to rotate forwardly by the rotation angle; When the relative posture is: the first reverse side of the first workpiece (5) faces the detection component, and the second front side of the second workpiece (6) faces the detection component, firstly control the second fixture component (4) and the second workpiece (6) to rotate 180 degrees with the vertical direction as the axis, and then control the rotating mechanism (2) to rotate in the opposite direction to the rotation angle; When the relative posture is: the first reverse side of the first workpiece (5) faces the detection component, and the second reverse side of the second workpiece (6) faces the detection component, the rotating mechanism (2) rotates in the opposite direction to the rotation angle.

Images