Positioning and control device for precise welding of hydraulic torque converter

Abstract

The invention relates to the technical field of electric arc welding, and discloses a hydraulic torque converter precision welding positioning and control device which comprises a sliding rail, a sliding block connected to the top of the sliding rail in a sliding mode and a pressing air cylinder used for pressing a hydraulic torque converter assembly, a plane bearing is arranged at the output end of the pressing air cylinder, and a positioning disc is fixedly installed at the bottom end of the plane bearing. A bowl-mouth-shaped groove is formed in the bottom of the positioning disc, a pressure disc capable of moving relative to the positioning disc is arranged in the groove, and a detection device used for detecting whether the pressure disc is centered and presses the positioning disc is arranged in the groove. Through positioning of the sliding block and centering detection of the pressing air cylinder, pre-guarantee is provided for the stability of the distance between a welding seam and a welding gun in the welding process of the hydraulic torque converter assembly. And meanwhile, through joint detection, mutual self-detection of two working condition anomalies is formed, so that an operator can conveniently judge where problems occur. And positioning and detection after positioning are completed before welding, so that the welding defective rate caused by inaccurate positioning can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of arc welding, and specifically to a positioning and control device for precision welding of a torque converter. Background Art

[0002] The torque converter is composed of a pump impeller, a turbine and a stator, and transfers kinetic energy through liquid. It is mostly used between the engine and the transmission of household cars, engineering vehicles, etc.

[0003] For the welding technology of the torque converter assembly, tungsten inert gas welding (TIG) spot welding is mostly used for positioning, and then metal active gas welding (MAG welding) is used for circumferential welding of the assembly. Then, the end face of the connecting block is milled to ensure the flatness of the connecting block plane after the assembly is welded. During MAG welding, four welding torches are evenly distributed in a ring, and the torque converter assembly is slowly rotated 90° by a servo motor. For details, refer to Chinese Patent No. CN 112276309A, a four-gun automatic welding device for a torque converter assembly.

[0004] During welding, the torque converter assembly after spot welding positioning is installed on the support, and then the support is sent directly below the pressing cylinder. The position of the welding torch is adjusted (only the first adjustment is required), and the welding torch is driven to the weld. The welding torch and the servo motor that drives the rotation of the torque converter assembly start working synchronously. In the above process, it is necessary to strictly control the precise positioning of the support and the alignment with the axis of the pressing cylinder. At the same time, it is necessary to ensure the alignment of the axis of the torque converter assembly with the pressing cylinder. Otherwise, during the rotary welding process, the distance between the local weld and the welding torch may change due to eccentric rotation, affecting the welding quality; and during the process of driving the support by the lead screw, due to the wear of the lead screw or the accumulation of welding dust at the lead screw positioning point, an error occurs in the alignment of the support with the pressing cylinder, which will also affect the aforementioned welding quality. In view of this, a positioning and control device for arc welding is proposed to solve the above technical problems. Summary of the Invention

[0005] Aiming at the deficiencies existing in the use of the existing torque converter welding equipment in the background art, the present invention provides a positioning and control device for precision welding of a torque converter, which has the advantages of stable welding positioning and the ability to realize self-inspection of the alignment of the welded parts, and solves the above technical problems in the background art.

[0006] The present invention provides the following technical solution: A positioning and control device for precision welding of a hydraulic torque converter, comprising a slide rail, a slider slidably connected to the top of the slide rail, and a pressing cylinder for pressing the hydraulic torque converter assembly. The slider is used to send the hydraulic torque converter assembly to the welding positioning point. A contact switch is provided at the top of the slide rail, and the contact switch is used to control the stroke positioning of the slider. A plain bearing is provided at the output end of the pressing cylinder. The plain bearing is used to press the central shaft of the hydraulic torque converter assembly and provide a fixed support point for the rotation of the hydraulic torque converter assembly. A positioning disk is fixedly installed at the bottom end of the plain bearing. A bowl-shaped groove is formed at the bottom of the positioning disk. A pressure disk that can move relative to the positioning disk is provided in the groove. A detection device for detecting whether the pressure disk presses against the positioning disk in a centered manner is provided in the groove.

[0007] Preferably, symmetrically arranged chutes are formed on the left and right sides of the pressure disk. A limiting slide bar is slidably connected in the chute, and the limiting slide bar is fixedly installed on the inner wall of the groove of the positioning disk. The detection device is a pressure sensor fixedly installed at the center of the bottom of the positioning disk. When the pressure disk slides to the topmost end of the groove of the positioning disk, only in the centered state does the pressure sensor receive the maximum pressure from the pressure disk.

[0008] Preferably, there is a perpendicular movement space between the chute and the limiting slide bar.

[0009] Preferably, the top of the pressure disk is adapted to the shape of the bottom of the positioning disk and the groove. A positioning spring is fixedly installed on the edge horizontal platform of the positioning disk and the pressure disk. The detection device is a pressure sensor fixedly installed at the center of the bottom of the positioning disk. When the pressure disk slides to the topmost end of the groove of the positioning disk, only in the centered state does the pressure sensor receive the maximum pressure from the pressure disk.

[0010] Preferably, multiple pressure sensors are provided and arranged in an annular array on the inclined surface of the groove.

[0011] Preferably, the positioning spring is arranged at the inclined surface of the groove, and the axial arrangement of the positioning spring is inclined towards the rotation direction of the pressure disk.

[0012] Preferably, the top of the pressure disk is adapted to the shape of the bottom of the positioning disk and the groove. A positioning spring is fixedly installed on the edge horizontal platform of the positioning disk and the pressure disk. The detection device is a permanent magnet installed on the top of the pressure disk and an induction coil installed on the bottom of the positioning disk. The permanent magnet and the induction coil are arranged correspondingly. When the pressure disk slides to the topmost end of the groove of the positioning disk, only in the centered state does the induction coil not generate an electrical signal.

[0013] The present invention has the following beneficial effects: 1. The present invention provides a preliminary guarantee for the stability of the distance between the weld seam and the welding torch during the welding process of the hydraulic torque converter assembly by positioning the slider and detecting the centering of the pressing cylinder. At the same time, through joint detection, mutual self-checking of two abnormal working conditions is formed, which is convenient for the operator to judge where the problem occurs.

[0014] 2. The present invention can reduce the defective rate of welding caused by inaccurate positioning by completing positioning before welding and detecting after positioning.

[0015] 3. The present invention realizes a variety of centering detection methods through the setting and cooperation of a chute, a limiting slide bar, and a pressure sensor, or a positioning spring cooperating with a pressure sensor, and a positioning spring cooperating with an induction coil, for selection according to the needs of actual use scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic layout diagram of the centering detection structure of Embodiment 1 of the present invention; Figure 3 is the present invention Figure 2 the enlarged schematic diagram at A in; Figure 4 is a schematic layout diagram of the centering detection structure of Embodiment 2 of the present invention; Figure 5 is a schematic layout diagram of the centering detection structure of Embodiment 3 of the present invention.

[0017] In the figure: 1. Bracket; 2. Pressing cylinder; 3. Slide rail; 4. Slider; 5. Lead screw; 6. Feeding servo motor; 7. Welding servo motor; 8. Support; 9. Hydraulic torque converter assembly; 10. Plain bearing; 11. Welding torch assembly; 12. Contact switch; 13. Positioning disk; 14. Pressure disk; 15. Chute; 16. Limiting slide bar; 17. Pressure sensor; 18. Positioning spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figure 1, A positioning and control device for precision welding of a hydraulic torque converter, including a bracket 1. A pressing cylinder 2 and a slide rail 3 are respectively arranged above and below the inside of the bracket 1. A slider 4 is slidably connected to the top of the slide rail 3. A lead screw 5 is threadedly connected inside the slider 4. One end of the lead screw 5 is connected to a feeding servo motor 6 through a coupling, and the other end of the lead screw 5 is rotatably connected to the inner wall of the bracket 1 through a bearing. The lead screw 5 is horizontally arranged. The feeding servo motor 6 is installed on the inner bottom of the bracket 1 through bolts. By driving the lead screw 5 to rotate forward and backward by the feeding servo motor 6, the slider 4 can be driven to move reciprocally. A welding servo motor 7 is fixedly installed at the top end of the slider 4. The output shaft of the welding servo motor 7 is fixedly connected to a support 8. The top end of the support 8 is used for clamping and fixing the central shaft of the hydraulic torque converter assembly 9, so that the hydraulic torque converter assembly 9 can be vertically installed on the support 8, and the welding servo motor 7 drives the support 8 and the hydraulic torque converter assembly 9 to rotate synchronously and coaxially. A plain bearing 10 is arranged at the output end of the pressing cylinder 2. The plain bearing 10 is used for pressing the central shaft of the hydraulic torque converter assembly 9 and providing a fixed support point for the rotation of the hydraulic torque converter assembly 9. Four groups of welding torch assemblies 11 are annularly arranged around the pressing cylinder 2, and the welding torch assemblies 11 can be adjusted up and down for control. After the slider 4 is adjusted to directly below the pressing cylinder 2 by the feeding servo motor 6, the output end of the pressing cylinder 2 extends and retracts downward, aligns with the top end of the central shaft of the hydraulic torque converter assembly 9, and presses the hydraulic torque converter assembly 9. The welding torch assemblies 11 are adjusted to near the weld of the hydraulic torque converter assembly 9. At the same time, the welding servo motor 7 and the welding torch assemblies 11 are started, and they rotate 90° at a rated angular velocity. Considering the butt joint of the weld, the rotation angle can be appropriately increased.

[0020] A contact switch 12 is arranged at the top end of the slide rail 3. The contact switch 12 is used to control the start and stop of the feeding servo motor 6. When one side of the slider 4 contacts the contact switch 12, the central shaft of the support 8 above the slider 4 is collinear with the central shaft of the pressing cylinder 2. Thus, in addition to the stable operation spacing control of the feeding servo motor 6 itself, the running position of the slider 4 can be accurately controlled through the contact switch 12.

[0021] Example 1, refer to Figure 2 and Figure 3, the plain bearing 10 is composed of an upper bearing seat, support rollers, and a lower bearing seat. The upper bearing seat is fixedly connected to the output shaft of the pressing cylinder 2. The outer ring of the lower bearing seat is fixedly installed with a positioning disk 13 through a flange. A bowl-shaped groove is formed at the bottom of the positioning disk 13. A pressure disk 14 is arranged in the groove. Sliding grooves 15 are formed on both the left and right sides of the pressure disk 14. The two sliding grooves 15 are symmetrically arranged on both sides of the pressure disk 14. A limiting slide bar 16 is slidably connected in the sliding groove 15. The limiting slide bar 16 is fixedly installed on the inner wall of the groove of the positioning disk 13. The two limiting slide bars 16 are also symmetrically arranged on both sides of the positioning disk 13. A pressure sensor 17 is fixedly installed at the center of the bottom of the positioning disk 13. When the pressure disk 14 slides to the topmost position of the groove of the positioning disk 13, the pressure sensor 17 is under the maximum pressure from the pressure disk 14.

[0022] To ensure the installation of the pressure disk 14, in addition to maintaining a relative sliding state between the sliding groove 15 and the limiting slide bar 16, the sliding groove 15 needs to hold the limiting slide bar 16 to prevent the pressure disk 14 from completely falling. That is, there is a vertical movement space between the sliding groove 15 and the limiting slide bar 16, and the space height needs to be controlled within 2 - 5 mm.

[0023] When the torque converter assembly 9 contacts the pressure disk 14 and is centered with positive pressure, after pressing, the pressure sensor 17 can reach the maximum rated detection pressure value; when the torque converter assembly 9 contacts the pressure disk 14 with eccentric positive pressure, after pressing, since the pressure disk 14 slides eccentrically and is not centered to press on the pressure sensor 17, the positive pressure received by the pressure sensor 17 is less than the rated maximum detection pressure value. Based on this, it can be determined whether it is centered. At the same time, combined with the position control of the contact switch 12, it can be accurately judged whether the positioning is normal.

[0024] Embodiment 2, refer to Figure 4 , the top of the pressure disk 14 is adapted to the bottom and the groove shape of the positioning disk 13. A positioning spring 18 is fixedly installed on the horizontal platform at the bottom edge of the positioning disk 13. There are several positioning springs 18 and they are annularly arrayed at the bottom of the positioning disk 13. One end of the positioning spring 18 is fixedly connected to the horizontal part at the top edge of the pressure disk 14. Through the positioning spring 18, the initial distance between the pressure disk 14 and the positioning disk 13 is controlled within 1 cm.

[0025] By replacing the chute 15 and the limiting slide bar 16 in the first embodiment with positioning springs 18, the contact point limitation between the hydraulic torque converter assembly 9 and the pressure plate 14 can be removed, improving the adaptability and making it easier to implement in actual operation. Specifically: when the hydraulic torque converter assembly 9 and the pressure plate 14 are in positive alignment, all the positioning springs 18 are synchronously compressed, and the pressure sensor 17 reaches the maximum rated detection value; due to the poor radial resistance of the positioning springs 18, when the hydraulic torque converter assembly 9 is in eccentric contact with the pressure plate 14, the pressure sensor 17 cannot receive the perfect positive pressure of the pressure plate 14, that is, it cannot reach the maximum rated detection value, so that a determination result can be obtained.

[0026] Considering the detection accuracy problem of the pressure sensor 17, multiple pressure sensors 17 can be set and arranged in an annular array on the inclined surface of the groove. Thus, the offset pressure plate 14 can always make some of the pressure sensors 17 be preferentially subjected to a larger pressure, and a determination result can be obtained through the uneven distribution of the pressure detection values.

[0027] Embodiment Three, refer to Figure 5 , on the basis of Embodiment Two, considering that after the hydraulic torque converter assembly 9 and the pressure plate 14 are tightly pressed, they still need to rotate synchronously to prevent the pressure plate 14 and the positioning plate 13 from generating too large a relative rotation angle. The positioning springs 18 are arranged at the inclined surface of the groove, and the axial arrangement of the positioning springs 18 is inclined towards the rotation direction of the pressure plate 14. Thus, when the pressure plate 14 rotates relative to the positioning plate 13, the positioning springs 18 can be subjected to axial pressure to prevent the pressure plate 14 from rotating relatively.

[0028] Embodiment Four, on the basis of Embodiments Two and Three, the pressure sensor 17 set is cancelled. A permanent magnet is provided at the top of the pressure plate 14, and an induction coil is provided at the bottom of the positioning plate 13. The permanent magnet and the induction coil are arranged correspondingly. If the hydraulic torque converter assembly 9 and the pressure plate 14 are not centered and pressed tightly, when the hydraulic torque converter assembly 9 rotates synchronously with the pressure plate 14, there will be a periodic relative translation between the pressure plate 14 and the positioning plate 13, so that an induced current or induced electromotive force can be generated. The detection determination result can be obtained through an amplifier. That is, after the pressure plate 14 presses the hydraulic torque converter assembly 9 and before starting welding, first drive the hydraulic torque converter assembly 9 to rotate at a rated speed by the welding servo motor 7 to check whether there is an amplified induced current or induced electromotive force.

[0029] Embodiments Two, Three, and Four can all be determined through the combined contact switch 12 to eliminate the influencing factors that the slider 4 does not move in place due to the wear or dust accumulation of the lead screw 5.

[0030] Considering the wiring problem of the rotating body factor, an electric slip ring is connected to the outer ring of the positioning plate 13 or an avoidance groove is opened at the central axis of the positioning plate 13, and the relevant structure is suspended and installed at the bottom center position of the pressing cylinder 2 through the through-plane bearing 10.

[0031] The control method of the first embodiment is as follows: S1. After the hydraulic torque converter assembly 9 is installed in place, as shown by the dotted line part in Figure 1 , start the feeding servo motor 6 to drive the slider 4 to move to the contact switch 12. When the contact switch 12 is triggered, the feeding servo motor 6 stops running and locks the slider 4 at the current position; S2. Start the pressing cylinder 2 to move downward to drive the flat bearing 10 to press the top of the hydraulic torque converter assembly 9. After the pressure plate 14 is pressed against the hydraulic torque converter assembly 9, determine whether the pressure value detected by the pressure sensor 17 meets the rated value range; if it meets, execute step S3; S3. Start the welding torch assembly 11 to move downward, and then synchronously start the welding servo motor 7.

[0032] The control method of the second embodiment is as follows: S1. After the hydraulic torque converter assembly 9 is installed in place, as shown by the dotted line part in Figure 1 , start the feeding servo motor 6 to drive the slider 4 to move to the contact switch 12. When the contact switch 12 is triggered, the feeding servo motor 6 stops running and locks the slider 4 at the current position; S2. Start the pressing cylinder 2 to move downward to drive the flat bearing 10 to press the top of the hydraulic torque converter assembly 9. After the pressure plate 14 is pressed against the hydraulic torque converter assembly 9, determine whether the pressure values detected by multiple pressure sensors 17 are approximately equal within the error range or whether the pressure value distribution is balanced; if it meets, execute step S3; S3. Start the welding torch assembly 11 to move downward, and then synchronously start the welding servo motor 7.

[0033] The control method of the third embodiment is as follows: S1. After the hydraulic torque converter assembly 9 is installed in place, as shown by the dotted line part in Figure 1 , start the feeding servo motor 6 to drive the slider 4 to move to the contact switch 12. When the contact switch 12 is triggered, the feeding servo motor 6 stops running and locks the slider 4 at the current position; S2. Start the pressing cylinder 2 to move downward to drive the flat bearing 10 to press the top of the hydraulic torque converter assembly 9. After the pressure plate 14 is pressed against the hydraulic torque converter assembly 9, determine whether the pressure value detected by the pressure sensor 17 meets the rated value range; if it meets, execute step S3; S3. Start the welding torch assembly 11 to move downward, and then synchronously start the welding servo motor 7.

[0034] The control method of the fourth embodiment is as follows: S1. After the hydraulic torque converter assembly 9 is installed in place, as shown by the dotted line part in Figure 1As shown by the dashed line part in the figure, start the feeding servo motor 6 to drive the slider 4 to move to the contact switch 12. When the contact switch 12 is triggered, the feeding servo motor 6 stops running and locks the slider 4 at the current position; S2. Start the pressing cylinder 2 to move downward, driving the plain bearing 10 to press the top of the torque converter assembly 9. After the pressure plate 14 presses against the torque converter assembly 9, start the welding servo motor 7 to drive the torque converter assembly 9 to rotate at the rated speed, and determine by whether there is an induced current or induced electromotive force in the induction coil; if not, it meets the requirements, and after meeting the requirements, execute step S3; S3. Start the welding torch assembly 11 to move downward, and then start the welding servo motor 7 synchronously; S4. During the welding process, monitor in real time whether there is an abnormal electrical signal in the induction coil to determine whether the distance between the weld seam and the welding torch is abnormal during the welding process.

[0035] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0036] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A positioning and control device for precision welding of a torque converter, comprising a slide rail (3), a slider (4) slidably connected to the top of the slide rail (3), and a clamping cylinder (2) for clamping a torque converter assembly (9), wherein the slider (4) is used to deliver the torque converter assembly (9) to a welding positioning point, and is characterized in that: A contact switch (12) is provided at the top of the slide rail (3), and the contact switch (12) is used to control the stroke positioning of the slide block (4); a plane bearing (10) is provided at the output end of the pressing cylinder (2), and the plane bearing (10) is used to press the central axis of the hydraulic torque converter assembly (9) and provide a fixed support point for the rotation of the hydraulic torque converter assembly (9); a positioning plate (13) is fixedly installed at the bottom end of the plane bearing (10), and a bowl-shaped groove is provided at the bottom of the positioning plate (13), and a pressure plate (14) movable relative to the positioning plate (13) is provided in the groove, and a detection device for detecting whether the pressure plate (14) is centered and presses against the positioning plate (13) is provided in the groove.

2. The positioning and control device for precision welding of a torque converter according to claim 1, characterized in that: The left and right sides of the pressure plate (14) are provided with symmetrically arranged sliding grooves (15), and a limit sliding bar (16) is slidably connected in the sliding groove (15). The limit sliding bar (16) is fixedly mounted on the inner wall of the groove of the positioning plate (13). The detection device is a pressure sensor (17) fixedly mounted at the bottom center of the positioning plate (13). When the pressure plate (14) slides to the top of the groove of the positioning plate (13), the pressure on the pressure plate (14) reaches the maximum only when the pressure sensor (17) is in the centered state.

3. The positioning and control device for precision welding of a torque converter according to claim 2, characterized in that: The slide groove (15) and the limit slide bar (16) have vertical movement space.

4. The positioning and control device for precision welding of a torque converter according to claim 1, characterized in that: The top of the pressure plate (14) is adapted to the bottom of the positioning plate (13) and the shape of the groove. A positioning spring (18) is fixedly installed on the edge water platform of the positioning plate (13) and the pressure plate (14). The detection device is a pressure sensor (17) fixedly installed at the center of the bottom of the positioning plate (13). When the pressure plate (14) slides to the top of the groove of the positioning plate (13), the pressure on the pressure plate (14) reaches the maximum only when the pressure sensor (17) is in the centered state.

5. The positioning and control device for precision welding of a torque converter according to claim 4, characterized in that: The pressure sensors (17) are provided in plurality and arranged in a ring array on the inclined surface of the groove.

6. A positioning and control device for precision welding of a torque converter according to any one of claims 4 or 5, characterized in that: The positioning spring (18) is arranged on the inclined surface of the groove, and the axial arrangement of the positioning spring (18) is inclined towards the rotation direction of the pressure plate (14).

7. The positioning and control device for precision welding of a torque converter according to claim 1, characterized in that: The top of the pressure plate (14) is adapted to the bottom of the positioning plate (13) and the shape of the groove. A positioning spring (18) is fixedly installed on the edge horizontal platform of the positioning plate (13) and the pressure plate (14). The detection device is a permanent magnet installed on the top of the pressure plate (14) and an induction coil installed on the bottom of the positioning plate (13). The permanent magnet and the induction coil are arranged correspondingly. When the pressure plate (14) slides to the top of the groove of the positioning plate (13), the induction coil does not generate an electrical signal only in the centered state.

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