A U-shaped bolt seat spot welding tool

Abstract

The application discloses a U-shaped bolt seat spot welding tool and relates to the technical field of welding tools, which comprises a machine table, a clamping device and a positioning mechanism. The machine table is provided with a support frame which supports the extended parts at the two ends of a workpiece and realizes the center positioning of the workpiece. The clamping device is clamped on the extended parts and comprises a positioning block and a clamping block. The clamping block and the positioning block are connected through magnetic adsorption. The clamping block is provided with a matching surface which is inclined relative to the vertical direction. The positioning block can slide along the matching surface, realizes the fine adjustment of the clamping block in the horizontal direction, can adapt to the non-machining surface of the workpiece and avoids the position deviation after clamping. Limiting blocks are arranged on the matching surface to avoid the falling of the positioning block during use. The positioning mechanism comprises a positioning plate and a sliding block. The sliding block is connected with the positioning plate and slides horizontally. The positioning plate abuts against the positioning surface of the workpiece, realizes that the positioning surface is perpendicular to the horizontal surface or maintains a certain inclination angle and realizes the positioning of the workpiece in the vertical direction.

Description

Technical Field

[0001] This invention relates to the field of welding fixture technology, and in particular to a spot welding fixture for U-bolt seats. Background Technology

[0002] Typically, welding of vehicle axles requires fastening and positioning of the workpiece. Current positioning methods lack precision, and since the outer surface of the axle is not machined, fine-tuning is not possible with the current clamping method. Different workpieces will produce positional errors during clamping, which in turn leads to welding errors, reduces the yield of workpieces, and may even require rework, affecting production efficiency. Summary of the Invention

[0003] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a U-bolt seat spot welding fixture that simplifies the installation process and improves production efficiency.

[0004] According to an embodiment of the present invention, a U-bolt seat spot welding fixture is provided, comprising:

[0005] The machine base is equipped with a support frame, which supports the extensions at both ends of the workpiece and centers the extensions.

[0006] A clamping device is clamped on both sides of the axis of the extension. The clamping device includes a positioning block and a clamping block. The clamping block and the positioning block are connected by magnetic attraction. The clamping block has a mating surface that is inclined relative to the vertical direction. The positioning block can slide along the mating surface to realize the fine adjustment of the clamping block in the horizontal direction. At the same time, a limiting block is provided on the mating surface to limit the sliding distance of the positioning block.

[0007] The positioning mechanism is fixed on the machine base. The positioning mechanism includes a positioning plate and a slider. The slider is connected to the positioning plate and slides horizontally. The positioning plate abuts against the positioning surface of the workpiece to achieve the vertical positioning of the workpiece.

[0008] The U-shaped bolt seat spot welding fixture of the present invention has at least the following beneficial effects: This embodiment includes a machine table, a clamping device, and a positioning mechanism. The machine table has a support frame that supports the extensions at both ends of the workpiece and centrally positions the extensions, ensuring the workpiece is centered during placement. The clamping device holds the extensions on both sides of their axis. The clamping device includes a positioning block and a clamping block, which are magnetically connected. The clamping block has a mating surface inclined relative to the vertical direction, allowing the positioning block to slide along the mating surface. This enables fine-tuning of the clamping block in the horizontal direction, adapting to the non-machined surfaces of the workpiece and ensuring consistent positioning of each workpiece on the fixture. This avoids positional deviations after clamping, preventing machining errors. Simultaneously, a limiting block is provided on the mating surface to restrict the sliding distance of the positioning block, preventing it from falling off during use and ensuring stable clamping. The positioning mechanism is fixed on the machine base. The positioning mechanism includes a positioning plate and a slider. The slider is connected to the positioning plate and slides horizontally. The positioning plate abuts against the positioning surface of the workpiece, so that the positioning surface of the workpiece is perpendicular to the horizontal plane or maintains a certain tilt angle, thereby achieving the positioning of the workpiece in the vertical direction.

[0009] According to the present invention, a U-shaped bolt seat spot welding fixture has a magnetic block embedded in the clamping block, and the magnetic block causes the positioning block to fit against the mating surface.

[0010] According to the present invention, a U-shaped bolt seat spot welding fixture is provided on the positioning block, the limiting block is embedded in the receiving cavity, and there is a gap between the limiting block and the receiving cavity to allow the positioning block to move.

[0011] According to the U-shaped bolt seat spot welding fixture of the present invention, the clamping device further includes a mounting frame, a movable support and a clamping cylinder. The clamping block is fixedly connected to the movable support, and the clamping cylinder pushes the movable support to slide on the mounting frame to achieve clamping of the workpiece.

[0012] According to the U-shaped bolt seat spot welding fixture of the present invention, the positioning mechanism further includes a sliding seat and a screw, and rotating the screw can move the slider on the sliding seat.

[0013] According to the U-shaped bolt seat spot welding fixture of the present invention, the machine base is provided with a translation device for adjusting the support frame. The translation device includes an adjusting rod and a guide seat located at the bottom of the support frame. The surface of the adjusting rod is provided with a first threaded portion, and one of the brackets is screwed into the first threaded portion. Rotating the adjusting rod can make the support frame move horizontally on the guide seat.

[0014] According to the U-shaped bolt seat spot welding fixture of the present invention, the translation device further includes a C-shaped connector and a connecting rod. The opening of the C-shaped connector faces inward. The adjusting rod is provided with a second threaded portion. One end of the connector is screwed to the second threaded portion. The two ends of the connecting rod are respectively fixedly connected to the other end of the connector and another support frame. The threads on the first threaded portion and the threads on the second threaded portion have opposite directions of rotation.

[0015] According to the U-shaped bolt seat spot welding fixture of the present invention, the positioning mechanism is provided with a sensing device, which includes a sensing plate fixed to the positioning plate and a sensor fixedly installed to detect the position of the positioning plate.

[0016] According to the present invention, a U-shaped bolt seat spot welding fixture has a support frame with a V-shaped pad, which is supported on the radial outer side of the extension.

[0017] According to the present invention, a U-shaped bolt seat spot welding fixture is provided with a connecting block on the movable bracket, and the connecting block and the clamping cylinder are floatingly connected.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0020] Figure 1 This is an isometric view of a U-shaped bolt seat spot welding fixture according to an embodiment of the present invention;

[0021] Figure 2 This is a cross-sectional view of the clamping device according to an embodiment of the present invention;

[0022] Figure 3 This is a partial view of the clamping device according to an embodiment of the present invention;

[0023] Figure 4 This is a top view of the translation device according to an embodiment of the present invention;

[0024] Figure 5 This is a partial view of the cooperation between the support frame and the support part in an embodiment of the present invention;

[0025] Figure 6 This is an isometric view of the positioning mechanism according to an embodiment of the present invention.

[0026] Figure label:

[0027] Workpiece 10; Positioning surface 11; Extension 12; Support 13; End face 14;

[0028] Machine base 100; support frame 101; pad 102; crimping block 103; guide seat 104; adjusting block 105; adjusting rod 106; connector 107; connecting rod 108; support foot 109;

[0029] Clamping device 110; fixed base 111; fastener 112; mating surface 113; magnet block 114; receiving cavity 115; limiting block 116; mounting bracket 117; movable bracket 118; clamping cylinder 119; connecting block 120; handwheel 121; first clamping member 122; second clamping member 123; first pressure block 124; second pressure block 125; linear slide rail 126; connecting groove 127;

[0030] Positioning mechanism 130; positioning plate 131; slider 132; pressure block 133; screw 134; nut seat 135; sensing plate 136; sensor 137; sliding seat 138; mounting platform 139. Detailed Implementation

[0031] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0032] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0033] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0034] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0035] Reference Figures 1 to 6This invention provides a U-bolt seat spot welding fixture, including a machine base 100, a clamping device 110, and a positioning mechanism 130. The machine base 100 includes support legs 109 at the bottom for mounting on the ground. Support frames 101 are provided at both ends of the machine base 100, slidably connected to the machine base 100. The support frames 101 support the extension portions 12 at both ends of the workpiece 10 and center the extension portions 12. Optionally, the support frames 101 are provided with V-shaped pads 102, which support the radially outer side of the extension portions 12. Since the extension portions 12 of the workpiece 10 have cylindrical support portions 13, which are mounted on the support frames 101 and press against the pads 102, the V-shaped pads 102 help to automatically center the workpiece 10 after it is mounted on the machine base 100 via the extension portions 12, thus determining the position of the workpiece 10. (See reference...) Figure 5 The workpiece 10 is provided with an end face 14, which abuts against the side wall of the pad 102 for positioning the end of the workpiece 10 during the loading process. Optionally, the end face 14 can abut against the side wall of the pad 102 on any support frame 101 to achieve positioning of the workpiece 10.

[0036] Reference Figure 4The machine base 100 is equipped with a translation device for adjusting the support frame 101. The translation device includes an adjusting rod 106 and a guide seat 104 located at the bottom of the support frame 101. The adjusting rod 106 is threadedly connected to the support frame 101. Rotating the adjusting rod 106 allows the support frame 101 to move horizontally on the guide seat 104. It is understood that the adjusting rod 106 is a rod with external threads. At the same time, an adjusting block 105 is provided at the bottom of the support frame 101. The adjusting block 105 slides within the guide seat 104 to keep the support frame 101 in a straight line during movement. The adjusting block 105 and the adjusting rod 106 are threadedly connected. Rotating the adjusting rod 106 allows the adjusting block 105 to slide, thereby achieving position adjustment of the support frame 101. Optionally, a pressing block 103 is provided on the guide seat 104. The pressing block 103 is located on both sides of the guide seat 104, and the inner side of the pressing block 103 abuts against the upper surface of the adjusting block 105, which helps to prevent the support frame 101 from tipping over. Further, since the support frame 101 is located at both ends of the workpiece 10, the translation device also includes a connector 107 and a connecting rod 108. The adjusting rod 106, the connector 107, and the connecting rod 108 are connected in sequence. The connector 107 is located in the middle of the machine base 100. When the adjusting rod 106 rotates, it drives the connector 107 and the connecting rod 108 to drive the support frame 101 at the other end of the workpiece 10. Specifically, the adjusting rod 106 and the connecting member 107 are connected by a thread. When the adjusting rod 106 rotates, the connecting member 107 translates relative to the machine base 100. Simultaneously, to prevent axial movement of the adjusting rod 106, a fixed seat 111 is provided on the machine base 100. The adjusting rod 106 has a portion with a reduced inner diameter that inserts into the fixed seat 111, ensuring the stability of the adjusting rod 106's position. Further, a fastener 112 is provided on the machine base 100. The fastener 112 presses against the upper part of the connecting member 107 to prevent the connecting member 107 from rotating with the adjusting rod 106, ensuring effective driving of the connecting member 107 by the adjusting rod 106. Optionally, both ends of the connecting rod 108 are fixedly connected to the connecting member 107 and the adjusting block 105 located at the other end of the machine base 100, respectively, allowing both support frames 101 to be adjusted simultaneously. Optionally, the adjusting rod 106 is provided with two types of threads, including left-hand and right-hand threads. That is, the threads connecting the adjusting rod 106 to the adjusting block 105 and the threads connecting to the connecting member 107 have opposite helical directions. This allows the two support frames 101 to move closer to the center of the machine base 100 when the adjusting rod 106 is rotated, which helps to center and position the workpiece 10. Since the adjusting rod 106 and the connecting rod 108 are connected by the connecting member 107, and the connecting member 107 is set as a C-shaped structure with the opening facing inward, the translation device can avoid the bottom of the workpiece 10 at the connecting member 107. When clamping and positioning the workpiece 10, the C-shaped connecting member will not interfere with the bottom of the workpiece 10.In addition, in other embodiments, an adjustment rod can be set to directly connect the two support frames 101, eliminating the connector 107, which can also realize the position adjustment process of the support frames 101 at both ends of the workpiece 10.

[0037] Reference Figure 1 A clamping device 110 is provided on the machine base 100. The clamping device 110 clamps both sides of the axis of the extension 12. The clamping device 110 includes a positioning block and a clamping block. The positioning block is located on the clamping block on the side closer to the workpiece 10. Optionally, the clamping block and the positioning block are connected by magnetic attraction, as shown in the figure. Figure 3 The clamping block has an embedded magnet 114, which causes the positioning block to fit against the mating surface 113. Optionally, at least two magnets 114 are provided to help stabilize the connection of the positioning blocks. Optionally, the magnets 114 can be fixed in the clamping block by interference fit or adhesive, etc., to achieve stable installation. (Refer to...) Figure 2 The mating surface 113 of the clamping block is inclined relative to the vertical direction. Simultaneously, the positioning block can slide along the mating surface 113, enabling fine-tuning of the clamping block in the horizontal direction. This allows it to adapt to the non-machined surface of the workpiece 10, ensuring consistent positioning of each workpiece 10 on the fixture and preventing positional deviations after clamping, which could lead to machining errors. Furthermore, since the axial direction of the support portion 13 on the workpiece 10 is determined by the pad 102 on the support frame 101, the horizontally adjustable positioning block can also prevent displacement of the workpiece 10 after clamping, thus avoiding welding errors. Specifically, refer to... Figure 2 The clamping block includes a first clamping member 122 and a second clamping member 123, and the positioning block includes a first pressing block 124 and a second pressing block 125. The first pressing block 124 is fixed to the first clamping member 122, and the second pressing block 125 is fixed to the second clamping member 123. The first pressing block 124 and the first clamping member 122, the second pressing block 125 and the second clamping member 123 are respectively located on both sides of the extension 12 of the workpiece 10. Optionally, the mating surfaces 113 on the first clamping member 122 and the second clamping member 123 may have the same or parallel inclination direction; or the mating surfaces 113 on the first clamping member 122 and the second clamping member 123 may have different inclination directions and form a certain angle with each other, both of which can achieve the process of clamping the workpiece 10.

[0038] Optionally, a limiting block 116 is provided on the mating surface 113 to restrict the sliding distance of the positioning block, preventing the positioning block from falling off during use and achieving stable clamping. Optionally, the limiting block 116 protrudes from the mating surface 113, and correspondingly, the positioning block has a receiving cavity 115. The limiting block 116 is embedded in the receiving cavity 115, and there is a gap between the limiting block 116 and the receiving cavity 115 to allow the positioning block to move. Further, the limiting block 116 can be fixed by integral molding with the clamping block or by bolt connection to ensure the stable connection between the limiting block 116 and the clamping block.

[0039] Optionally, the clamping device 110 further includes a mounting frame 117, a movable support 118, and a clamping cylinder 119. The mounting frame 117 is fixedly mounted on the machine base 100, the clamping cylinder 119 is fixedly mounted on the mounting frame 117, the movable support 118 is slidably connected to the mounting frame 117, and the clamping block is fixedly connected to the movable support 118. The clamping cylinder 119 pushes the movable support 118 to slide on the mounting frame 117, thereby clamping the workpiece 10. Optionally, the bottom of the movable support 118 is provided with a linear slide rail 126 for supporting and guiding the movable support 118. Optionally, at least two linear slide rails 126 are provided to help ensure the stable sliding of the movable support 118 and to improve the rigidity and stability of the clamping, which is beneficial to ensuring machining accuracy. Optionally, the clamping cylinder 119 can be a pneumatic cylinder or a hydraulic cylinder to achieve the clamping action. Optionally, the movable support 118 is provided with a connecting block 120, and the connecting block 120 and the clamping cylinder 119 are floatingly connected. Furthermore, the connecting block 120 is provided with a connecting groove 127, which is preferably a T-shaped groove. The piston rod end of the clamping cylinder 119 is engaged with the connecting groove 127. Preferably, the length of the connecting groove 127 extends vertically, allowing the clamping cylinder 119 to move vertically during operation. This helps eliminate longitudinal offset of the clamping cylinder 119 caused by installation accuracy errors and avoids internal stress between the piston rod and the moving bracket 118 during piston rod movement, thereby ensuring smooth operation of the clamping device 110. Optionally, a spherical floating joint can also be provided between the connecting block 120 and the clamping cylinder 119 to achieve a floating connection, achieving the same effect.

[0040] Reference Figure 1 and Figure 6A positioning mechanism 130 is fixedly installed on the machine base 100. The positioning mechanism 130 includes a positioning plate 131 and a slider 132. The slider 132 is connected to the positioning plate 131 and slides horizontally. The positioning plate 131 abuts against the positioning surface 11 of the workpiece 10 to achieve vertical positioning of the workpiece 10. Optionally, the positioning surface 11 of the workpiece 10 is perpendicular to the horizontal plane, or, depending on the needs of the welding process, the positioning surface 11 forms a certain angle with the horizontal plane. The positioning plate 131 abuts against the positioning surface 11 of the workpiece 10 to ensure that the positioning surface 11 of the workpiece 10 is perpendicular to the horizontal plane or maintains a certain tilt angle, thereby achieving vertical positioning of the workpiece 10. Optionally, pressure blocks 133 are provided on the positioning plate 131. The pressure blocks 133 are located at both ends of the positioning plate 131 and abut against the upper and lower ends of the positioning surface 11, effectively achieving angular positioning of the positioning surface 11. Optionally, the positioning mechanism 130 further includes a mounting platform 139, a sliding seat 138, and a screw 134. The mounting platform 139 is fixedly disposed in the middle of the machine base 100. Rotating the screw 134 allows the slider 132 to move on the sliding seat 138. Specifically, a nut seat 135 is provided on the mounting platform 139, and a nut that mates with the screw 134 is provided on the nut seat 135. The end of the screw 134 is rotatably connected to the slider 132. Therefore, rotating the screw 134 can push the slider 132 to move, thereby realizing the pressing and releasing of the positioning plate 131 onto the workpiece 10. Optionally, a handwheel 121 is provided on the screw 134, which allows for easy manual operation of the screw 134.

[0041] Reference Figure 6 The positioning mechanism 130 is equipped with a sensing device, which includes a sensing plate 136 fixed to the positioning plate 131 and a fixedly mounted sensor 137, enabling the detection of the position of the positioning plate 131. Specifically, the length of the sensing plate 136 extends along the length direction of the slider 132, while the sensor is fixedly mounted on the sliding seat 138. The sensing plate 136 moves with the slider 132, and the sensor detects the position of the sensing plate 136 to provide feedback on whether the clamping is in place, which helps to increase the safety of clamping. Optionally, the sensor can be an infrared sensing element, an inductive sensing element, or a photoelectric sensing element, all of which can detect the sensing plate 136.

[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A spot welding fixture for U-shaped bolt seats, characterized in that, include: The machine base is equipped with two support frames, which support the extensions at both ends of the workpiece and center the extensions. A clamping device is provided, clamping the extension portion on both sides of its axis. The clamping device includes a positioning block and a clamping block, which are magnetically connected. The clamping block has a mating surface inclined relative to the vertical direction, allowing the positioning block to slide along the mating surface for fine-tuning in the horizontal direction. A limiting block on the mating surface restricts the sliding distance of the positioning block. A magnet is embedded within the clamping block, enabling the positioning block to conform to the mating surface. The positioning block has a receiving cavity, into which the limiting block is embedded, with a gap between the limiting block and the receiving cavity to allow movement of the positioning block. The clamping device also includes a mounting frame, a movable support, and a clamping cylinder. The clamping block is fixedly connected to the movable support, and the clamping cylinder pushes the movable support to slide on the mounting frame, thus clamping the workpiece. A positioning mechanism is fixed on the machine base. The positioning mechanism includes a positioning plate and a slider. The slider is connected to the positioning plate and slides horizontally. The positioning plate abuts against the positioning surface of the workpiece to achieve vertical positioning of the workpiece.

2. The U-shaped bolt seat spot welding fixture according to claim 1, characterized in that: The positioning mechanism also includes a sliding seat and a screw, and rotating the screw can move the slider on the sliding seat.

3. The U-shaped bolt seat spot welding fixture according to claim 1, characterized in that: The machine base is provided with a translation device for adjusting the support frame. The translation device includes an adjusting rod and a guide seat located at the bottom of the support frame. The surface of the adjusting rod is provided with a first threaded portion, and one of the support frames is screwed to the first threaded portion. Rotating the adjusting rod can make the support frame move horizontally on the guide seat.

4. The U-shaped bolt seat spot welding fixture according to claim 3, characterized in that: The translation device also includes a C-shaped connector and a connecting rod. The opening of the C-shape of the connector faces inward. The adjusting rod is provided with a second threaded portion. One end of the connector is screwed to the second threaded portion. The two ends of the connecting rod are respectively fixedly connected to the other end of the connector and another support frame. The threads on the first threaded portion and the threads on the second threaded portion have opposite directions of rotation.

5. The U-shaped bolt seat spot welding fixture according to claim 4, characterized in that: The positioning mechanism is equipped with a sensing device, which includes a sensing plate fixed to the positioning plate and a fixedly installed sensor to detect the position of the positioning plate.

6. The U-shaped bolt seat spot welding fixture according to claim 1, characterized in that: The support frame has a V-shaped pad that is supported on the radially outer side of the extension.

7. The U-shaped bolt seat spot welding fixture according to claim 1, characterized in that: The movable support is provided with a connecting block, and the connecting block and the clamping cylinder are connected by a floating connection.

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