Positioning tool for sofa chair motor driving pipe frame welding

Abstract

The application discloses a positioning tool for sofa chair motor driving pipe frame welding, and relates to the technical field of sofa chair motor driving pipe frame machining.The application comprises a base, a mounting bottom plate, a driving plate automatic positioning mechanism, a driving pipe automatic positioning mechanism and an automatic hinged seat positioning mechanism.The driving plate automatic positioning mechanism comprises a driving plate conveying unit and a driving plate positioning unit.The base is provided with the driving pipe automatic positioning mechanism between the two driving plate automatic positioning mechanisms, and the driving pipe automatic positioning mechanism is symmetrically provided with two groups on the mounting bottom plate.The automatic hinged seat positioning mechanism comprises a correction conveying belt unit and a hinged seat clamping lifting positioning unit.The driving plate is fixed by the mold plate, so that the driving plate can be conveyed and positioned and welded.The driving pipe and the hinged seat are sent to the fixed position in sequence to be fixed, so that the automatic welding is completed, and the problems of manual fixing, low welding efficiency and the like of the prior art are solved.

Description

Technical Field

[0001] This invention belongs to the field of sofa and chair motor drive tube frame processing technology, and in particular relates to a positioning fixture for welding sofa and chair motor drive tube frames. Background Technology

[0002] With technological advancements and improved living standards, electric furniture, such as electric sofas and chairs, is increasingly becoming a part of daily life. Existing electric sofas and chairs use a motor to drive a frame that extends or retracts, allowing the sofa to assume different postures for users. The extension / retraction structure consists of a drive frame and a telescopic frame. The drive frame is connected to the telescopic frame, and an electric push rod is connected to the drive frame, pushing the drive frame to extend or retract the entire telescopic frame.

[0003] In existing technologies, drive tube frames generally consist of two drive plates connected to a telescopic frame, two drive tubes fixed between the two drive plates, and hinged seats fixed to the drive tubes and connected to a motor. The drive plates, drive tubes, and hinged seats are mostly fixed by welding; that is, the drive plates are fixed using a device, and the operator holds the drive tubes and hinged seats to perform welding. This welding method suffers from low efficiency, low precision, and cumbersome welding, leaving room for improvement. While existing technologies use robotic arms to control laser welding, the fixed positioning of the drive plates, the two drive tubes fixed between the two drive plates, and the hinged seats fixed to the drive tubes and connected to a motor still requires manual operation to fix them to the positioning device. After each welding operation, the device needs to be manually removed and a new set fixed, which is cumbersome and prevents continuous welding. During welding, workers cannot get too close and must wait for the welding to complete before approaching for assembly to prevent sparks from hitting them. Summary of the Invention

[0004] The purpose of this invention is to provide a positioning fixture for welding the motor drive tube frame of a sofa chair. The drive plate is fixed by a mold plate so that it can be transported for positioning welding. The drive tube and the hinge seat are sent to the fixed position one after another for fixing, so as to complete the automatic welding. This solves the problems of existing fixing methods that require manual fixing and have low welding efficiency.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: a positioning fixture for welding the motor drive tube frame of a sofa chair, comprising a base, a mounting base plate, an automatic positioning mechanism for the drive plate, an automatic positioning mechanism for the drive tube, and an automatic hinge seat positioning mechanism;

[0006] The upper surface of the base is symmetrically provided with mounting base plates near the left and right sides. Automatic positioning mechanisms for drive plates are symmetrically installed on the two mounting base plates. The automatic positioning mechanism for drive plates includes a drive plate transport unit and a drive plate positioning unit. The drive plate is fixed on the mold plate. The mold plates are stacked and placed into the drive plate transport unit. The mold plates are sent from the drive plate transport unit into the drive plate positioning unit for fixing.

[0007] An automatic positioning mechanism for drive tubes is provided on the base between two automatic positioning mechanisms for drive plates. Two sets of automatic positioning mechanisms for drive tubes are symmetrically arranged on the mounting base plate. Each automatic positioning mechanism for drive tubes includes a drive tube conveyor belt and a fixed height lifting and fixing unit. Each of the two sets of automatic positioning mechanisms for drive tubes raises a drive tube to a fixed height position. Each of the two drive plate positioning units pushes the drive plate on the mold plate inside the drive tube to the middle position to dock and position with the two drive tubes.

[0008] The automatic articulated seat positioning mechanism is located at the position of the automatic positioning mechanism of the drive plate on the front side of the base. The automatic articulated seat positioning mechanism includes a straightening conveyor belt unit and an articulated seat clamping and lifting positioning unit.

[0009] The present invention is further configured such that the drive plate conveying unit includes a mold conveying frame, a mold pushing component, and a mold side pushing component. The mold conveying frame is a U-shaped conveying frame. Four protruding slide rails are symmetrically arranged on the two inner side walls of the mold conveying frame. Four sliding grooves matching the protruding slide rails are symmetrically arranged on both sides of the mold plate. A mold pushing component is provided at the middle position of the bottom of the mold conveying frame. A square opening that fits outside the mold pushing component is provided at the middle position of the thickened section of the lower half of the mold plate. The top of the square opening rests on the mold pushing component. The mold conveying frame has a sealing edge at the output end. The mold conveying frame has an output opening on the side of the output end facing the drive plate positioning unit. The mold conveying frame has a mold side pushing component on the side of the output end opposite to the output opening, which is a side pushing cylinder and a side pushing plate installed on the side pushing cylinder.

[0010] The drive plate positioning unit includes a clamping block, a first limiting plate, and a second limiting plate. Two first limiting slide rods are provided between the first limiting plate and the second limiting plate. The bottom of the clamping block is movably sleeved on the two first limiting slide rods. A forward-pushing cylinder is provided on the second limiting plate. A positioning clamping port facing the output opening is provided on the clamping block. A positioning cylinder assembly and a compression fixing cylinder assembly are installed on the rear side wall of the clamping block.

[0011] The present invention is further configured such that the mold pushing assembly includes a pushing groove and a pushing belt, the pushing groove has rollers at both ends, the pushing belt is sleeved on the two rollers, the pushing belt has protruding semi-circular protrusions evenly distributed on its surface, and a support plate is provided below the upper layer of the pushing belt.

[0012] The invention is further configured such that the upper half of the mold plate is thinned to form a positioning plate, the lower half of the mold plate has a thickness of 3-5 cm, and the width of the output opening and the positioning clamping opening are equal and 10-15% larger than the thickness of the lower half of the mold plate.

[0013] The invention is further configured such that the drive tube conveyor belt has grooves on both sides of the output end, and slots are provided on the grooves. The fixed height lifting and fixing unit includes a fixed height mounting block, an inverted U-shaped lifting pull plate, a pull plate lifting assembly, and a drive tube fixing assembly. The fixed height mounting block has a lifting groove in the middle of one side wall facing the drive tube conveyor belt. The pull plates on both sides of the inverted U-shaped lifting pull plate are L-shaped pull plates, and the bottom ends of the L-shaped pull plates can extend into the slots. The pull plate lifting assembly includes two vertical limiting slide rods, a lifting screw, and a lifting motor. The two vertical limiting slide rods are installed in the lifting groove. A lifting block is provided in the middle of the back of the inverted U-shaped lifting pull plate. The two ends of the lifting block are movably sleeved on the vertical limiting slide rods. A lifting screw is connected to the shaft of the lifting motor and spirally passes through the middle of the lifting block. The fixed height mounting block has a fixing installation port in the upper half of both sides of the lifting groove, and the drive tube fixing assembly is installed in the fixing installation port.

[0014] The present invention is further configured such that the drive tube fixing assembly includes a height-fixing sleeve, an extension fixing block, and a height-adjusting bolt. The height-fixing sleeve has an opening on the side facing the drive tube conveyor belt. Limiting slide rails are provided on both side walls of the height-fixing sleeve. Vertical sliding grooves matching the limiting slide rails are provided on both side walls of the fixing installation port. The bottom end of the height-adjusting bolt is rotatably mounted on the top of the height-fixing sleeve. A disc motor is embedded in the front end of the extension fixing block, and a retaining strip is fitted on the shaft of the disc motor. A pressure plate is embedded in the bottom of the front half of the extension fixing block. A pressure cylinder is embedded in the extension fixing block, and the pressure plate is mounted on the pressure cylinder. An external push motor is fixed on the rear side wall of the height-fixing sleeve, and an external push screw is connected to the shaft of the external push motor. The external push screw is spirally inserted from the rear side of the extension fixing block forward.

[0015] The present invention is further configured such that the number of automatic positioning mechanisms for the drive tubes in the two sets of front and rear is the same, and each set consists of one or two.

[0016] When the hinge seat is welded to the middle position or near the middle position of the drive tube, there are two automatic positioning mechanisms for the drive tube in each group, and the automatic hinge seat positioning mechanism is set between the two automatic positioning mechanisms for the drive tube in the front group.

[0017] When the hinge seat is welded to the drive tube near the end, there is one automatic positioning mechanism for each group of drive tubes, and the automatic hinge seat positioning mechanism is located next to the front automatic positioning mechanism for drive tubes.

[0018] The present invention is further configured such that the straightening conveyor belt unit includes an articulated seat straightening frame and an articulated seat conveyor belt, the articulated seat straightening frame includes an infeed frame and a straightening ejector frame, the output end of the infeed frame is perpendicularly connected to the rear end of the straightening ejector frame, the infeed frame is provided with a conveyor belt, the straightening ejector frame is a limiting U-shaped slide, and the rear side of the straightening ejector frame is provided with a pushing device that can accurately push the articulated seat from the straightening ejector frame onto the articulated seat conveyor belt;

[0019] The hinged seat clamping and lifting positioning unit includes a lifting base column, a lifting cylinder, a lifting box, and a clamping positioning block. The lifting base column has two movable sleeve columns at the top and a downwardly embedded lifting cylinder in the middle. The rear half of the lifting box is movably fitted onto the lifting base column, and the bottom of the lifting box is fixed to the lifting cylinder. The clamping positioning block is movably inserted from the front of the lifting box into its front half. A forward-push positioning cylinder is embedded in the rear half of the lifting box. The forward-push positioning cylinder is fixedly connected to the rear side of the clamping positioning block. The upper surface of the output end of the hinged seat conveyor belt is directly below the clamping positioning block.

[0020] The present invention is further configured such that two symmetrical clamping plate mounting slots are provided on the front side of the clamping positioning block, and two clamping plates are symmetrically installed in the clamping plate mounting slots. A clamping motor is provided on each of the two side walls of the front half of the clamping positioning block. A bidirectional lead screw that spirally passes through the two clamping plates is provided in the clamping plate mounting slot, and one end of the bidirectional lead screw is connected to the rotating shaft of the clamping motor.

[0021] The invention is further configured such that the corner positions of the front and rear sides of the mounting base are provided with strip holes, and the upper surface of the base is provided with four limiting bolt rods near the left and right sides. The four strip holes on the mounting base are fitted onto the matching limiting bolt rods, and nuts are screwed onto the limiting bolt rods to fix the mounting base.

[0022] The present invention has the following beneficial effects:

[0023] 1. This invention first fixes the drive plate to a mold plate, allowing the drive plate to be vertically positioned on the mold plate for subsequent automatic positioning and welding without manual fixing. When the two drive plates reach the positioning position, the automatic positioning mechanism for the drive tubes is activated, transporting the two drive tubes to a fixed point and height for fixing. Then, the two drive plates are pushed towards the two drive tubes, ensuring precise positioning and fixing. Finally, the hinge seat is transported to the hinge seat to clamp and lift the positioning unit. Then, it is lifted to a fixed height and pushed against the inner wall of the front drive tube for fitting and fixing. At this time, the robotic arm moves the laser welding device to perform automated welding. After welding is completed, the clamped mold plate, drive tubes, and hinge seat are released, and the robotic arm can clamp and remove the welded sofa chair motor drive tube frame before proceeding to the next set of automatic welding. The degree of automation is high.

[0024] 2. This invention can be adjusted to accommodate the fixing of motor drive tube frames of different sizes of sofas and chairs. Different drive boards can be replaced with matching mold plates to fix the corresponding model of sofa and chair motor drive tube frames, thus improving applicability. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a positioning fixture for welding a motor drive tube frame for sofas and chairs.

[0027] Figure 2 This is an exploded structural diagram of a positioning fixture for welding a motor drive tube frame for a sofa chair.

[0028] Figure 3 This is a schematic diagram of the automatic positioning mechanism for the drive board.

[0029] Figure 4 This is an exploded structural diagram of the automatic positioning mechanism for the drive board.

[0030] Figure 5 This is a schematic diagram of an automatic positioning mechanism for a drive tube and an automatic hinged seat positioning mechanism.

[0031] Figure 6 for Figure 5 A schematic diagram of the explosion structure.

[0032] Figure 7 This is a schematic diagram of the mold plate structure.

[0033] Figure 8This is a schematic diagram of the mold plate conveyor frame.

[0034] Figure 9 This is a schematic diagram of the clamping block.

[0035] Figure 10 This is a structural diagram of the drive tube conveyor belt and the fixed-height mounting block (without the belt).

[0036] Figure 11 This is a schematic diagram of the inverted U-shaped lifting plate.

[0037] Figure 12 This is a structural schematic diagram of a fixed-height box.

[0038] Figure 13 This is a schematic diagram of the clamping and positioning block.

[0039] The attached diagram lists the components represented by each number as follows:

[0040] 1. Base; 2. Mounting base plate; 3. Drive plate conveying unit; 30. Mold conveyor frame; 31. Push belt; 32. Push belt groove; 33. Side push cylinder; 34. Side push plate; 35. Output opening; 36. Protruding slide rail; 4. Drive plate positioning unit; 41. Clamping block; 411. Positioning clamping port; 412. Limiting slide rod insertion hole; 413. Extrusion cylinder insertion hole; 414. Positioning cylinder insertion hole; 42. Positioning cylinder; 43. Extrusion fixing cylinder; 44. First limiting plate; 45. Second limiting plate; 46. Forward push cylinder; 47. First limiting slide rod; 5. Automatic positioning mechanism for drive tube; 51. Drive tube conveyor belt; 511. Slot; 52. Fixed mounting port; 53. Fixed... 531. High mounting block; 532. Lifting screw; 54. Vertical limit slide bar; 55. Inverted U-shaped lifting pull plate; 56. Lifting groove; 6. Automatic hinged seat positioning mechanism; 7. Mold plate; 71. Thickened section; 711. Square opening; 72. Slide groove opening; 73. Positioning plate; 8. Drive tube fixing assembly; 81. Height-fixing sleeve; 811. Height-adjusting bolt; 812. Limiting slide rail; 82. External push motor; 83. Extending fixing block; 84. Disc motor; 85. Lower pressure plate; 9. Hinge seat clamping lifting positioning unit; 91. Lifting base column; 92. Lifting cylinder; 93. Lifting box; 94. Clamping positioning block; 941. Clamping plate mounting groove; 95. Clamping plate; 951. Clamping motor. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Please see Figure 1-13 The present invention is a positioning fixture for welding the motor drive tube frame of a sofa chair, including a base 1, a mounting base plate 2, an automatic positioning mechanism for the drive plate, an automatic positioning mechanism for the drive tube 5, and an automatic hinge seat positioning mechanism 6.

[0043] The upper surface of the base 1 is symmetrically provided with mounting base plates 2 near the left and right sides. The two mounting base plates are symmetrically provided with automatic positioning mechanisms for drive plates. The automatic positioning mechanism for drive plates includes a drive plate transport unit 3 and a drive plate positioning unit 4. The drive plate is fixed on the mold plate 7. The mold plates 7 are stacked and placed into the drive plate transport unit 3. The mold plates 7 are sent from the drive plate transport unit 3 into the drive plate positioning unit 4 for fixing.

[0044] First, the drive plate is installed and fixed on the mold plate 7 so that it can be transported in batches from the drive plate transport unit 3. Then, it is pushed into the drive plate positioning unit 4 one by one (mainly fixing the lower half of the mold plate 7, while the drive plate fixed in the upper half is also fixed). The drive plate positioning unit 4 can move inward a certain distance so as to dock and fix with the drive tube fixed behind it.

[0045] The base 1 has an automatic drive tube positioning mechanism 5 between two automatic drive plate positioning mechanisms. Two sets of automatic drive tube positioning mechanisms 5 are symmetrically arranged on the mounting base plate 2. The automatic drive tube positioning mechanism 5 includes a drive tube conveyor belt 51 and a fixed height lifting and fixing unit. The two sets of automatic drive tube positioning mechanisms 5 respectively raise one drive tube to a fixed height position. The two drive plate positioning units 4 respectively push the drive plate on the mold plate 7 inside to the middle position to dock and position with the two drive tubes.

[0046] The drive tubes are arranged one by one on the drive tube conveyor belt 51 of the automatic positioning mechanism of the drive plate. When the drive tube conveyor belt 51 is transported to the fixed height lifting and fixing unit, it will be pulled up and fixed in a suitable fixed height position, and then fixed. The positions of the two ends of the drive tube may not be precise at the docking and welding position, but the process of the two drive plates moving relative to each other can push the drive tube to complete the precise docking and positioning.

[0047] The automatic articulated seat positioning mechanism 6 is located on the front side of the base 1 at the position of the automatic positioning mechanism 5 of the drive plate. The automatic articulated seat positioning mechanism 6 includes a straightening conveyor belt unit and an articulated seat clamping and lifting positioning unit 9.

[0048] The articulated seat is pushed onto the conveyor belt in an accurate manner through the straightening conveyor belt unit, and then precisely moved to the articulated seat clamping and lifting positioning unit 9. It is clamped and lifted to a fixed height to the positioning position, and then the robotic arm can perform laser welding.

[0049] The drive plate conveying unit 3 includes a mold conveying frame 30, a mold pushing assembly, and a mold side pushing assembly. The mold conveying frame 30 is a U-shaped conveying frame. Four protruding slide rails 36 are symmetrically arranged on the two inner side walls of the mold conveying frame 30. Four sliding grooves 72 matching the protruding slide rails 36 are symmetrically arranged on both sides of the mold plate 7. The mold pushing assembly is located in the middle of the bottom of the mold conveying frame 30. A square opening 711 that fits outside the mold pushing assembly is located in the middle of the thickened section 71 of the lower half of the mold plate 7. The top of the square opening 711 rests on the mold pushing assembly. The mold conveying frame 30 has a sealing edge at the output end. The mold conveying frame 30 has an output opening 35 on the side of the output end facing the drive plate positioning unit 4. The mold conveying frame 30 has a mold side pushing assembly on the side of the output end opposite to the output opening 35, which is a side pushing cylinder 33 and a side pushing plate 34 installed on the side pushing cylinder 33.

[0050] The lower half of the mold plate 7 is a thickened section 71, which can be conveyed on the mold conveyor frame 30. When it is conveyed to the output opening 35 (the thickness of the thickened section 71 of the lower half of the mold plate 7 is slightly smaller than the width of the output opening 35), the side push cylinder 33 pushes the side push plate 34, which can push a mold plate 7 into the positioning clamping port 411 for fixing.

[0051] The drive plate positioning unit 4 includes a clamping block 41, a first limiting plate 44, and a second limiting plate 45. Two first limiting slide rods 47 are provided between the first limiting plate 44 and the second limiting plate 45. The bottom of the clamping block 41 is movably sleeved on the two first limiting slide rods 47. A forward pushing cylinder 46 is provided on the second limiting plate 45. A positioning clamping port 411 facing the output opening 35 is provided on the clamping block 41. A positioning cylinder 42 group and a pressing and fixing cylinder 43 group are installed on the rear side wall of the clamping block 41.

[0052] After being pushed into the positioning clamping port 411, the positioning cylinder 42 is pushed out and inserted into the positioning hole on the mold plate 7, then pulled back by the side push plate 34, and then continues to push a row of mold plates 7 to move. Waiting for the next push. The extrusion fixing cylinder 43 sets up to extrude and fix the lower half of the side wall of the mold plate 7. When the drive tube reaches the fixed position, the forward push cylinder 46 drives the clamping block 41 to move, so that the mold plate 7 moves, and the drive plate moves to the end of the drive tube to dock and fix, so as to facilitate subsequent welding. In the figure, the limit slide rod insertion hole 412 is the movable hole of the first limit slide rod 47, the extrusion cylinder insertion hole 413 is the mounting hole of the extrusion fixing cylinder 43; the positioning cylinder insertion hole 414 is the mounting hole of the positioning cylinder 42.

[0053] The mold pushing assembly includes a pushing groove 32 and a pushing belt 31. The pushing groove 32 has rollers at both ends, and the pushing belt 31 is fitted on the two rollers. The surface of the pushing belt 31 has evenly distributed protruding semi-circular protrusions, and a support plate is provided below the upper layer of the pushing belt 31.

[0054] When the mold plate 7 needs to be pushed again, after it is in place, or when there is a gap between the mold plates 7, they can be stacked together during the push. The semi-circular protrusion on the push belt 31 can contact the top wall of the square opening 711 at the bottom of the mold plate 7. When the mold plate 7 can move, it can be pushed by the semi-circular protrusion. When it cannot move, the semi-circular protrusion will be squeezed and moved from the bottom so that the mold plates 7 that can be stacked have gaps. They can be stacked without gaps. After stacking without gaps, there is no need to stack and push them later. Instead, after the mold plates 7 are pushed out one by one, the mold plates 7 are pushed one by one by the push belt 31.

[0055] The upper half of the mold plate 7 is thinned to form a positioning plate 73. The lower half of the mold plate 7 has a thickness of 3-5 cm. The widths of the output opening 35 and the positioning clamping opening 411 are equal and 10-15% larger than the thickness of the lower half of the mold plate 7. A drive plate can be installed at the position where the positioning plate 73 is thinned. The thickness of the drive plate and the positioning plate 73 will not be greater than that of the lower half of the mold plate 7. The positioning plate 73 is provided with mounting bolt holes to fix the drive plate.

[0056] The drive tube conveyor belt 51 has grooves on both sides of its output end, and slots 511 are provided on the grooves. The fixed height lifting and fixing unit includes a fixed height mounting block 53, an inverted U-shaped lifting pull plate 54, a pull plate lifting assembly, and a drive tube fixing assembly 8. The fixed height mounting block 53 has a lifting groove 540 in the middle of one side wall facing the drive tube conveyor belt 51. The pull plates on both sides of the inverted U-shaped lifting pull plate 54 are L-shaped pull plates 542, and the bottom ends of the L-shaped pull plates 542 can extend into the slots 511. The pull plate lifting assembly includes two vertical limiting slide rods 532 and a lifting... The lead screw 531 and the lifting motor, and the two vertical limiting slide rods 532 are installed in the lifting groove 540. The lifting block 541 is provided at the middle position of the back of the inverted U-shaped lifting pull plate 54. The two ends of the lifting block 541 are movably sleeved on the vertical limiting slide rods 532. The lifting motor shaft is connected to the lifting lead screw 531 and the lifting lead screw 531 spirally passes through the middle position of the lifting block 541. The fixed height mounting block 53 has a fixed mounting port 52 on the upper half of both sides of the lifting groove 540. The drive tube fixing assembly 8 is installed in the fixed mounting port 52.

[0057] When the drive tube is transported to the slot, the lifting assembly raises the inverted U-shaped lifting plate 54, and the L-shaped lifting plate 542 pulls the drive tube up (the L-shaped lifting plate 542 has magnets attached to it to hold the drive tube in place and prevent it from rolling off during the pulling process). The lifting motor drives the lifting screw 531 to raise the lifting block 541 to a fixed height. The drive tube fixing assembly 8 then starts to fix the drive tube, preventing it from shaking or misaligning during welding. The lifting slot 540 is used to place the bottom of the L-shaped lifting plate 542 to prevent the drive tube from being pushed smoothly into the L-shaped lifting plate 542.

[0058] The drive tube fixing assembly 8 includes a height-fixing sleeve 81, an extension fixing block 83, and a height-adjusting bolt 811. The height-fixing sleeve 81 has an opening facing the drive tube conveyor belt 51. Limiting slide rails 812 are provided on both side walls of the height-fixing sleeve 81. Vertical sliding grooves matching the limiting slide rails 812 are provided on both side walls of the fixing installation port 52. The bottom end of the height-adjusting bolt 811 is rotatably mounted on the top of the height-fixing sleeve 81. A disc motor 84 is embedded in the front end of the extension fixing block 83, and a retaining strip is fitted on the shaft of the disc motor 84. A lower pressure plate 85 is embedded in the bottom of the front half of the extension fixing block 83. A lower pressure cylinder is embedded in the extension fixing block 83, and the lower pressure plate 85 is mounted on the lower pressure cylinder. An external push motor 82 is fixed on the rear side wall of the height-fixing sleeve 81, and an external push screw is connected to the shaft of the external push motor 82. The external push screw is spirally inserted forward from the rear side of the extension fixing block 83.

[0059] During the upward movement of the drive tube, the extended fixing block 83 has already extended, and the disc motor 84 sets the clamping strip downward with its lower end curved outward. When the drive tube moves upward, the clamping strip can smoothly lock onto the outer wall of the drive tube to prevent the drive tube from moving outward. The clamping strip and the L-shaped pull plate 542 hold the drive tube together. At this time, the pressing cylinder moves downward to press the pressing plate 85 onto the drive tube, completing the fixation of the four walls of the drive tube. However, the drive tube can still be pulled left and right so that when the drive plate approaches the two ends of the drive tube later, it can calibrate the situation where the positions of the two ends of the drive tube are inaccurate.

[0060] The number of automatic positioning mechanisms 5 for the drive tube in the two sets is the same, and each set has one or two such mechanisms;

[0061] When the hinge seat is welded to the middle position or near the middle position of the drive tube, there are two automatic positioning mechanisms 5 for each group of drive tubes, and the automatic hinge seat positioning mechanism 6 is set between the two automatic positioning mechanisms 5 of the front group.

[0062] When the hinge seat is welded to the drive tube near the end, there is one automatic positioning mechanism 5 for each group of drive tubes, and the automatic hinge seat positioning mechanism 6 is located next to the front automatic positioning mechanism 5 of the drive tube.

[0063] Since the hinged seat is welded to different positions on the drive tube as needed, the number of automatic positioning mechanisms 5 for the drive tube is designed. If it is welded to the middle position, the drive tube is prone to shaking when one automatic positioning mechanism 5 pulls up the drive tube. Therefore, two mechanisms are designed to pull up and fix the two ends of the drive tube simultaneously (e.g., ...). Figure 1-2 All are fixed welded hinged seats in the middle.

[0064] The straightening conveyor belt unit includes a hinged seat straightening frame and a hinged seat conveyor belt 63. The hinged seat straightening frame includes an infeed frame 61 and a straightening ejector frame 62. The output end of the infeed frame 61 is perpendicularly connected to the rear end of the straightening ejector frame 62. The infeed frame 61 is equipped with a conveyor belt. The straightening ejector frame 62 is a limiting U-shaped slide. The rear side of the straightening ejector frame 62 is equipped with a pushing device that can accurately push the hinged seat from the straightening ejector frame 62 onto the hinged seat conveyor belt 63.

[0065] The articulated seat is a U-shaped joint, with both side walls clamped and the middle wall attached to the back of the drive tube for welding. However, to ensure the articulated seat accurately moves both side walls into position, the feeding frame 61 feeds the articulated seat onto the corrective ejector frame 62 with a limit push. The pushing device is a push cylinder with a push plate in front, which accurately pushes the articulated seat onto the articulated seat conveyor belt 63. The articulated seat conveyor belt 63 can accurately move the articulated seat to position without shaking.

[0066] The hinged seat clamping and lifting positioning unit 9 includes a lifting base column 91, a lifting cylinder 92, a lifting box 93, and a clamping and positioning block 94. The lifting base column 91 has two movable sleeve columns at the top and a downwardly embedded lifting cylinder 92 in the middle. The rear half of the lifting box 93 is movably sleeved on the lifting base column, and the bottom of the lifting box 93 is fixed on the lifting cylinder 92. The clamping and positioning block 94 is movably inserted from the front of the lifting box 93 into its front half. A forward-push positioning cylinder is embedded in the rear half of the lifting box 93. The forward-push positioning cylinder is fixedly connected to the rear side of the clamping and positioning block 94. The upper surface of the output end of the hinged seat conveyor belt 63 is directly below the clamping and positioning block 94.

[0067] A distance sensor (laser rangefinder, or a laser rangefinder on the side of the output end of the hinge seat conveyor belt 63) can be installed on the clamping and positioning block 94. When a hinge seat reaches the position, the conveying stops. The clamping and positioning block 94 is then activated to clamp a hinge seat. Then, the lifting cylinder 92 is used to raise it to a fixed height position. Finally, the clamping and positioning block 94 is pushed outward, so that the hinge seat is accurately pushed and fixed at a fixed position on the back of the drive tube. Wait for welding. After welding is completed, the clamping strip flips up, the pressing cylinder moves the pressing plate 85 up into the protruding fixing block 83, and then the protruding fixing block 83 is pulled back. At the same time, the positioning cylinder and the pressing fixing cylinder are all pulled back, the clamping position of the hinge seat is released, and the fixed mold plates are all released from clamping. At this time, the sofa chair motor drive tube frame (including the two mold plates being lifted together) can be clamped and welded by the robotic arm and moved to the placement position, waiting for the next movement and fixing positioning before welding.

[0068] The clamping and positioning block 94 has two symmetrical clamping plate mounting slots 941 on its front side. Two clamping plates 95 are symmetrically installed in the clamping plate mounting slots 941. A clamping motor 951 is provided on each of the two side walls of the front half of the clamping and positioning block 94. A bidirectional lead screw that spirally passes through the two clamping plates is provided in the clamping plate mounting slots 941. One end of the bidirectional lead screw is connected to the shaft of the clamping motor 951.

[0069] The two clamping plates 95 can move and clamp each other under the rotation of the bidirectional screw, or meet and disengage to release the clamping. The inner side of the clamping plate 95 has rubber skin to facilitate clamping.

[0070] The mounting base plate 2 has strip-shaped holes at the corners of its front and rear sides. The upper surface of the base 1 has four limiting bolt rods near the left and right sides. The four strip-shaped holes on the mounting base plate 2 are fitted onto the matching limiting bolt rods, and nuts are screwed onto the limiting bolt rods to fix the mounting base plate 2.

[0071] The mounting base plate 2 can be adjusted to accommodate changes in the length of the drive tube, so that different types of drive tubes of different lengths can be welded.

[0072] To reiterate, if the drive plate has a square hole at the connection point with the drive tube, and the end of the drive tube is precisely inserted into the square hole for welding, a positioning and pressing device should be installed on the mounting base plate 2 facing outwards from the clamping block 41. During connection, the positioning and pressing device can block the square hole on the outer side of the drive plate with the pressing plate, ensuring that the drive tube is precisely inserted into the square hole and does not continue to be inserted outwards (the positioning and pressing device is not shown; it is set according to whether the drive plate has a square hole). After the positioning and pressing device is positioned, it should be pulled back to prevent welding from hitting the positioning and pressing device during welding.

[0073] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," 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, 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.

[0074] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A positioning fixture for welding a motor drive tube frame for a sofa chair, characterized in that: It includes a base (1), a mounting base plate (2), an automatic positioning mechanism for the drive plate, an automatic positioning mechanism for the drive tube (5), and an automatic hinge seat positioning mechanism (6). The base (1) has mounting base plates (2) symmetrically arranged on the upper surface near the left and right sides. The two mounting base plates (2) are symmetrically mounted with automatic positioning mechanisms for drive plates. The automatic positioning mechanism for drive plates includes a drive plate transport unit (3) and a drive plate positioning unit (4). The drive plate is fixed on the mold plate (7). The mold plates (7) are stacked and placed into the drive plate transport unit (3). The mold plates (7) are sent from the drive plate transport unit (3) into the drive plate positioning unit (4) for fixing. The base (1) is provided with an automatic positioning mechanism (5) for the drive tube between the two automatic positioning mechanisms for the drive plate. The automatic positioning mechanism (5) for the drive tube is provided with two sets symmetrically arranged on the mounting base plate (2). The automatic positioning mechanism (5) for the drive tube includes a drive tube conveyor belt (51) and a fixed height lifting and fixing unit. The two sets of automatic positioning mechanisms (5) for the drive tube respectively raise one drive tube to a fixed height position. The two drive plate positioning units (4) respectively push the drive plate on the mold plate (7) inside to the middle position to dock and position with the two drive tubes. The automatic articulated seat positioning mechanism (6) is located at the position of the automatic positioning mechanism (5) of the drive plate on the front side of the base (1). The automatic articulated seat positioning mechanism (6) includes a straightening conveyor belt unit and an articulated seat clamping and lifting positioning unit (9). The drive plate conveying unit (3) includes a mold conveying frame (30), a mold pushing assembly, and a mold side pushing assembly. The mold conveying frame (30) is a U-shaped conveying frame. Four protruding slide rails (36) are symmetrically arranged on the two inner side walls of the mold conveying frame (30). Four sliding grooves (72) matching the protruding slide rails (36) are symmetrically arranged on both sides of the mold plate (7). The mold pushing assembly is located in the middle of the bottom of the mold conveying frame (30). The middle of the thickened section (71) in the lower half of the mold plate (7) is located in the middle of the mold plate (7). A square opening (711) is provided outside the mold pushing assembly. The top of the square opening (711) rests on the mold pushing assembly. The mold conveying frame (30) has a blocking edge at the output end. The mold conveying frame (30) has an output opening (35) on the side of the output end facing the drive plate positioning unit (4). The mold conveying frame (30) has a mold side pushing assembly on the side of the output end opposite to the output opening (35), which is a side pushing cylinder (33) and a side pushing plate (34) installed on the side pushing cylinder (33). The drive plate positioning unit (4) includes a clamping block (41), a first limiting plate (44) and a second limiting plate (45). Two first limiting slide rods (47) are provided between the first limiting plate (44) and the second limiting plate (45). The bottom of the clamping block (41) is movably sleeved on the two first limiting slide rods (47). A forward pushing cylinder (46) is provided on the second limiting plate (45). A positioning clamping port (411) facing the output opening (35) is provided on the clamping block (41). A positioning cylinder (42) group and a pressing and fixing cylinder (43) group are installed on the rear side wall of the clamping block (41). The drive tube conveyor belt (51) has grooves on both sides of the output end, and slots (511) are provided on the grooves. The fixed height lifting and fixing unit includes a fixed height mounting block (53), an inverted U-shaped lifting pull plate (54), a pull plate lifting assembly and a drive tube fixing assembly (8). The fixed height mounting block (53) has a lifting groove (540) in the middle of one side wall facing the drive tube conveyor belt (51). The pull plates on both sides of the inverted U-shaped lifting pull plate (54) are L-shaped pull plates (542) and the bottom end of the L-shaped pull plate (542) can be inserted into the slot (511). The pull plate lifting assembly includes two vertical limiting slide rods (532) and a lifting screw. (531) and lifting motor, two vertical limiting slide rods (532) are installed in the lifting groove (540), the back of the inverted U-shaped lifting pull plate (54) is provided with a lifting block (541), the two ends of the lifting block (541) are movably sleeved on the vertical limiting slide rod (532), the lifting motor shaft is connected with a lifting screw (531) and the lifting screw (531) spirally passes through the middle position of the lifting block (541), the fixed height mounting block (53) is provided with a fixed mounting port (52) on the upper half of both sides of the lifting groove (540), and the drive tube fixing assembly (8) is installed in the fixed mounting port (52).

2. The positioning fixture for welding the motor drive tube frame of a sofa chair according to claim 1, characterized in that, The mold pushing assembly includes a pushing groove (32) and a pushing belt (31). The pushing groove (32) has rollers at both ends, and the pushing belt (31) is fitted on the two rollers. The surface of the pushing belt (31) is evenly distributed with protruding semi-circular protrusions, and a support plate is provided below the upper belt of the pushing belt (31).

3. The positioning fixture for welding the motor drive tube frame of a sofa chair according to claim 1, characterized in that, The upper half of the mold plate (7) is thinned to form a positioning plate (73), the lower half of the mold plate (7) is 3-5cm thick, and the width of the output opening (35) and the positioning clamping opening (411) are equal and 10-15% larger than the thickness of the lower half of the mold plate (7).

4. The positioning fixture for welding the motor drive tube frame of a sofa chair according to claim 1, characterized in that, The drive tube fixing assembly (8) includes a height-fixing sleeve (81), an extension fixing block (83), and an adjustment bolt (811). The height-fixing sleeve (81) has an opening on the side facing the drive tube conveyor belt (51). Limiting slide rails (812) are provided on both side walls of the height-fixing sleeve (81). Vertical sliding grooves matching the limiting slide rails (812) are provided on both side walls of the fixing installation port (52). The bottom end of the adjustment bolt (811) is rotatably mounted on the top of the height-fixing sleeve (81). The extension fixing block (811) is... The front end of the block (83) is embedded with a disc motor (84) and a retaining strip is fitted on the shaft of the disc motor (84). The bottom of the front half of the extended fixed block (83) is embedded with a pressure plate (85). The extended fixed block (83) is embedded with a pressure cylinder and the pressure plate (85) is mounted on the pressure cylinder. The rear side wall of the fixed height box (81) is fixed with an external push motor (82) and an external push screw is connected to the shaft of the external push motor (82). The external push screw is spirally inserted from the rear side of the extended fixed block (83).

5. A positioning fixture for welding a sofa chair motor drive tube frame according to any one of claims 1 or 4, characterized in that, The number of automatic positioning mechanisms (5) for the drive tube in the two sets is the same, and each set consists of one or two. When the hinge seat is welded to the middle position or near the middle position of the drive tube, there are two automatic positioning mechanisms (5) for each group of drive tubes, and the automatic hinge seat positioning mechanism (6) is set between the two automatic positioning mechanisms (5) of the front group. When the hinge seat is welded to the drive tube near the end, there is one automatic positioning mechanism (5) for each group of drive tubes, and the automatic hinge seat positioning mechanism (6) is located next to the front automatic positioning mechanism (5).

6. The positioning fixture for welding the motor drive tube frame of a sofa chair according to claim 1, characterized in that, The straightening conveyor belt unit includes a hinged seat straightening frame and a hinged seat conveyor belt (63). The hinged seat straightening frame includes an infeed frame (61) and a straightening ejector frame (62). The output end of the infeed frame (61) is perpendicularly connected to the rear end of the straightening ejector frame (62). The infeed frame (61) is equipped with a conveyor belt. The straightening ejector frame (62) is a limiting U-shaped slide. The rear side of the straightening ejector frame (62) is equipped with a pushing device that can accurately push the hinged seat from the straightening ejector frame (62) onto the hinged seat conveyor belt (63). The hinged seat clamping and lifting positioning unit (9) includes a lifting base column (91), a lifting cylinder (92), a lifting box (93), and a clamping positioning block (94). The lifting base column (91) has two movable sleeve columns at the top and a downwardly embedded lifting cylinder (92) in the middle. The rear half of the lifting box (93) is movably sleeved on the lifting base column (91), and the bottom of the lifting box (93) is fixed on the lifting cylinder (92). The clamping positioning block (94) is movably inserted from the front of the lifting box (93) into its front half. The rear half of the lifting box (93) is embedded with a forward-push positioning cylinder. The forward-push positioning cylinder is fixedly connected to the rear side of the clamping positioning block (94). The upper surface of the output end of the hinged seat conveyor belt (63) is directly below the clamping positioning block (94).

7. The positioning fixture for welding the motor drive tube frame of a sofa chair according to claim 6, characterized in that, The clamping positioning block (94) has two symmetrical clamping plate mounting slots (941) on its front side. Two clamping plates (95) are symmetrically installed in the clamping plate mounting slots (941). A clamping motor (951) is provided on each of the two side walls of the front half of the clamping positioning block (94). A bidirectional lead screw that spirally passes through the two clamping plates is provided in the clamping plate mounting slots (941). One end of the bidirectional lead screw is connected to the shaft of the clamping motor (951).

8. The positioning fixture for welding the motor drive tube frame of a sofa chair according to claim 1, characterized in that, The mounting base plate (2) has strip holes at the corners of the front and rear sides. The upper surface of the base (1) has four limiting bolt rods near the left and right sides. The four strip holes on the mounting base plate (2) are fitted onto the matching limiting bolt rods. The mounting base plate (2) is fixed by screwing nuts onto the limiting bolt rods.

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