An automatic casing seamer for shock absorbing bushings

Abstract

The utility model relates to an automatic sleeve sewing equipment for damping sliding bush, belongs to sliding bush processing equipment technical field. In the feeding mechanism, the rotary motor is driven to be connected with the rotating disc, and the guide rail is eccentrically arranged on the rotating disc, the import and the bottom are linked with the rotating disc respectively, and the height assembly is equipped, the export end extends to form the feeding track to the side vertical and to the downward inclination and forms the positioning track, makes the workpiece vertical into the positioning boss, in the sleeve sewing mechanism, the reciprocating motion assembly is driven to be connected with the core rod, and the driving core rod makes reciprocating linear motion along the guide table to the V type groove direction. The utility model discloses through " feeding, sleeve sewing, discharging " full-process automation linkage, solves the technical problem that traditional manual sleeve sewing exists and is big in human consumption, and the processing efficiency is low, and the size precision is poor, makes the human cost of sliding bush sleeve sewing processing greatly reduced, improves the processing efficiency of sliding bush sleeve sewing processing.

Description

Technical Field

[0001] This utility model relates to an automatic stitching device for shock-absorbing sliding bushings, belonging to the technical field of sliding bushing processing equipment. Background Technology

[0002] Sliding bushings (DU) are made from low-carbon steel plates, sintered with bronze powder, coated with a PTFE low-friction coating, and formed through slitting, punching, rolling, shaping, chamfering, and stitching processes. They are widely used in automobiles, machine tools, hydraulic equipment, food machinery, and other fields. Currently, for small-sized sliding bushings with precision requirements for gap opening dimensions (error ≤ ±0.1mm), the domestic industry still mainly uses manual stitching, which has core drawbacks: high labor costs, requiring 3-5 operators per production line with high labor intensity; low processing efficiency, with manual stitching of a single workpiece taking ≥40 seconds, resulting in a daily production capacity of less than 2000 pieces; poor dimensional consistency, with manual operation causing gap opening errors exceeding ±0.2mm, and a pass rate of only 75%-85%; and significant safety hazards, as manual contact with the processing area easily leads to scratches, crushing, and other workplace injuries. Therefore, developing an automated, high-precision stitching device has become an urgent technical problem to be solved in the industry. Utility Model Content

[0003] This invention addresses the shortcomings of existing manual sewing techniques by providing an automatic sewing device for shock-absorbing sliding bushings. The device features fully automated operation, stable and precise feeding, high safety performance, and effectively improves processing efficiency.

[0004] The technical solution of this utility model is as follows: An automatic stitching device for shock-absorbing sliding bushings includes a frame, a worktable fixed to the frame, and a feeding mechanism, a stitching mechanism, a discharging mechanism and a PLC control unit integrated on the worktable. Each mechanism is linked by electrical signals to achieve integrated processing of "automatic feeding, precise stitching and automatic discharging".

[0005] The feeding mechanism includes a rotating disk, a rotary motor, a guide rail, a feeding rail, a positioning rail, and a positioning boss; the rotary motor is driven and connected to the rotating disk, and the positioning boss is provided with a V-groove; the guide rail is eccentrically arranged on the rotating disk, and its inlet end and bottom are respectively connected to the rotating disk, and is provided with a height limiting component for adjusting the workpiece to a horizontal posture. The outlet end of the guide rail extends downward at an angle to form a feeding rail, and the outlet end of the feeding rail extends laterally vertically and downward at an angle to form a positioning rail; the outlet end of the positioning rail is located above the V-groove, so that the workpiece enters the V-groove in a vertical position. The stitching mechanism includes a reciprocating motion component, a mandrel, and a guide table; the head of the mandrel is provided with a frustum structure that matches the inner diameter of the sliding bushing, and the mandrel passes through the guide table; the reciprocating motion component is driven to the mandrel, driving the mandrel to reciprocate linearly along the guide table toward the V-groove direction; The feeding mechanism includes a material return groove and a material discharge groove. The material return groove is disposed between the positioning boss and the guide table, and the material discharge groove and the material return groove are arranged at an angle.

[0006] In the above scheme, the bottom of the guide rail is the upper surface area of ​​the rotating disk. Under the rotation of the rotating disk, the workpiece enters the horizontally arranged guide rail, the downwardly inclined feeding rail, and the vertically turning positioning rail in sequence. The height limiting component actively unifies the workpiece posture to a horizontal posture, and then enters the V-groove in a vertical posture at the exit end of the positioning rail. The V-groove makes the workpiece coaxial with the core rod of the sewing mechanism, ensuring that the workpiece feeding path is stable, the posture is controllable, and the positioning is accurate, thus completing the feeding.

[0007] The arrangement of each track ensures that the workpiece within the V-groove is coaxial with the mandrel. During the stitching process, the mandrel is driven forward along the guide table towards the V-groove, allowing the frustum structure at the mandrel head to insert into the inner hole of the sliding bushing to complete the stitching. After stitching is complete, the mandrel is driven backward along the guide table away from the V-groove. The stitched workpiece is blocked by the end face of the guide table, thus separating it from the continuing backward mandrel, and finally falling into the ejector groove.

[0008] Preferably, the width of the guide rail and the feeding rail is slightly larger than the outer diameter of the workpiece, and the feeding rail and the guide rail are connected by a ramp to change the workpiece from a horizontal to a vertical position; the width of the positioning rail is smaller than the outer diameter of the workpiece and slightly larger than the width of the workpiece, and the orientation rail is perpendicular to the feeding rail and arranged at an angle to ensure that the workpiece enters the orientation rail in a vertical position.

[0009] Preferably, the positioning boss has a vertically arranged positioning channel above the V-groove. The positioning channel connects the positioning track and the V-groove, ensuring that the workpiece enters the V-groove stably from the positioning track in a vertical position, thereby achieving precise positioning.

[0010] Preferably, the height limiting component includes a folding baffle located at the inlet end of the guide rail and folding rods spaced apart along the top of the guide rail; a gap is formed between the bottom edge of the folding baffle and the surface of the rotating disk, and the height of the gap is less than the outer diameter of the workpiece; the distance between the folding rods and the bottom of the guide rail is also less than the outer diameter of the workpiece. The folding baffle and folding rods ensure that the workpiece reliably and automatically assumes a horizontal posture when entering the guide rail.

[0011] Preferably, it also includes a PLC control unit, with a position sensor installed at the V-groove. The PLC control unit is communicatively connected to the position sensor, the rotary motor, and the reciprocating motion component. This ensures that the stitching action is initiated only after the material is properly loaded, achieving precise coordinated action between the various mechanisms.

[0012] Preferably, the reciprocating motion assembly includes: a drive motor, a disk, a bearing, a positioning frame, a pair of sliders, and a pair of guide rails; the bearing is eccentrically positioned on the end face of the disk and confined within the positioning frame; the pair of sliders are slidably engaged with a pair of parallel guide rails, and the positioning frame is fixedly connected to the pair of sliders; the drive motor is driven by the disk to drive the bearing to rotate circumferentially, thereby causing the positioning frame to reciprocate linearly along the guide rails; the tail end of the mandrel is fixedly connected to the positioning frame. The disk, bearing, positioning frame, sliders, and guide rails constitute a crank-slider mechanism, providing stable and reliable power to the mandrel.

[0013] Preferably, the disc end face is provided with a bearing adjustment frame, and the bearing adjustment frame is provided with a sliding groove extending radially along the disc; the bearing inner ring is provided with a mounting post, and the mounting post is slidably engaged with the sliding groove through an adjusting screw, and the adjusting screw is provided with a locking nut for adjusting the bearing eccentricity.

[0014] By tightening the locking nut, the sliding mounting column can be adjusted to change the radial position of the bearing on the disc, thereby changing the eccentricity and controlling the linear motion stroke of the mandrel. This changes the mating position between the side of the mandrel's frustum structure and the inner hole of the workpiece, enabling the adjustment of the slot size (i.e., the size of the slot opening) to suit the processing requirements of products of different specifications.

[0015] Preferably, a pusher cylinder is provided on one side of the unloading trough, and the pusher cylinder is arranged opposite to the unloading trough to push the completed workpiece into the unloading trough. The pusher cylinder actively pushes the workpiece to avoid it getting stuck in the unloading trough, ensuring smooth automatic unloading.

[0016] Preferably, a baffle plate is hinged to the top of the feeding trough to buffer and guide the workpiece and prevent it from splashing in the feeding trough.

[0017] This invention solves the technical problems of high labor consumption, low processing efficiency, and poor dimensional accuracy in traditional manual sewing by automating the entire process of "feeding, sewing, and unloading". It greatly reduces the labor cost of sliding bushing sewing, effectively shortens the processing time of a single workpiece, and controls the gap opening size error within ±0.05mm. The equipment improves operational safety through PLC closed-loop control, while ensuring processing consistency, effectively reducing the processing time of sliding bushing sewing, thus improving the processing efficiency of sliding bushing sewing. Attached Figure Description

[0018] Figure 1 This is a front view of the device of this utility model; Figure 2 This is a schematic diagram of the feeding mechanism of this utility model; Figure 3 This is a schematic diagram showing the connection of the feeding track, positioning track, and positioning boss in the feeding mechanism of this utility model; Figure 4 This is a schematic diagram of the sewing mechanism of this utility model; Figure 5 for Figure 4 Top view; Figure 6 This is a schematic diagram showing the connection between the disc, bearing, and positioning frame in this utility model; Figure 7 This is a schematic diagram of the bearing adjustment bracket in this utility model; Figure 8 This is a schematic diagram of the feeding mechanism in this utility model; Figure 9 for Figure 8 Side view; In the diagram: 1. Frame; 2. Feeding mechanism; 3. Sewing mechanism; 4. Unloading mechanism; 5. Rotary disk; 6. Rotary motor; 7. Guide rail; 8. Feeding rail; 9. Positioning rail; 10. Positioning boss; 11. Tilt-down baffle; 12. Tilt-down rod; 13. Core rod; 14. Guide table; 15. Drive motor; 16. Disc; 17. Bearing; 18. Positioning frame; 19. Slider; 20. Guide rail; 21. Bearing adjustment bracket; 22. Slide groove; 23. Mounting column; 24. Unloading groove; 25. Pushing cylinder; 26. Baffle plate; 27. Workpiece; 28. Positioning channel; 29. Detailed Implementation

[0019] An automatic stitching device for shock-absorbing sliding bushings, such as Figure 1 As shown, it includes a frame 1, a worktable fixed to the frame, and a feeding mechanism 2, a sewing mechanism 3, a discharging mechanism 4, and a PLC control unit integrated on the worktable.

[0020] like Figure 2-3 As shown, the feeding mechanism 1 includes a rotating disk 5, a rotary motor 6, a guide rail 7, a feeding rail 8, a positioning rail 9, and a positioning boss 10. The rotary motor is driven and connected to the rotating disk, and the positioning boss is provided with a V-groove. The guide rail is eccentrically arranged on the surface of the rotating disk, and its inlet end and bottom are respectively connected to the rotating disk, and it is provided with a height limiting component for adjusting the workpiece to a horizontal position. The outlet end of the guide rail extends downward at an incline to form the feeding rail, and the outlet end of the feeding rail extends laterally vertically and downward at an incline to form the positioning rail. A vertically arranged positioning channel 29 is provided between the outlet end of the positioning rail and the V-groove, so that the workpiece enters the V-groove in a vertical position.

[0021] In one embodiment of this utility model, the height limiting component includes a folding baffle 11 located at the inlet end of the guide rail and folding rods 12 spaced apart along the top of the guide rail; a gap is formed between the bottom edge of the folding baffle and the surface of the rotating disk, the height of the gap is less than the outer diameter of the workpiece, and the distance between the folding rod and the bottom of the guide rail is also less than the outer diameter of the workpiece, ensuring that the workpiece can be uniformly in a horizontal posture when entering the guide rail.

[0022] like Figure 4-5 As shown, the sewing mechanism includes a reciprocating motion assembly, a mandrel 13, and a guide table 14; the head of the mandrel is provided with a frustum structure that matches the inner diameter of the sliding bushing, and the mandrel passes through the guide table; the reciprocating motion assembly is driven to connect with the mandrel, driving the mandrel to reciprocate linearly along the guide table toward the V-groove.

[0023] In one embodiment of this utility model, such as Figure 4-6 As shown, the reciprocating motion assembly includes: a drive motor 15, a disc 16, a bearing 17, a positioning frame 18, a pair of sliders 19, and a pair of guide rails 20; the bearing is eccentrically positioned on the end face of the disc and confined within the positioning frame; the pair of sliders are slidably engaged with a pair of parallel guide rails, and the positioning frame is fixedly connected to the pair of sliders; the drive motor is connected to the disc and is used to drive the bearing to rotate circumferentially, thereby driving the positioning frame to perform reciprocating linear motion along the guide rails, and the tail end of the mandrel is fixedly connected to the positioning frame.

[0024] In one embodiment of this utility model, such as Figure 7 As shown, a bearing adjustment bracket 21 is provided on the end face of the disc, and a sliding groove 22 extending radially along the disc is provided on the bearing adjustment bracket; a mounting post 23 is provided on the inner ring of the bearing, and the mounting post slides in cooperation with the sliding groove through an adjusting screw. A locking nut is provided on the adjusting screw for adjusting the eccentricity of the bearing.

[0025] like Figure 8-9 As shown, the unloading mechanism includes an ejector groove 24, an unloading groove 25, and a pusher cylinder 26. The ejector groove is located between the positioning boss and the guide table, and the unloading groove and the ejector groove are arranged at an angle. The pusher cylinder is arranged opposite to the unloading groove and is used to push the completed workpiece into the unloading groove.

[0026] In one embodiment of this utility model, a baffle plate 27 is hinged to the top of the feeding trough, which serves as a buffer and guide.

[0027] The PLC control unit is connected to the position sensor, rotary motor, and drive motor respectively. The position sensor is located in the V-groove.

[0028] The working principle of this utility model is as follows: (1) Feeding mechanism (e.g.) Figure 2-3 (as shown) The workpiece to be sewn is placed in the rotating disk 5 of the feeding mechanism 1 (the rotating disk is surrounded by a hopper formed by a barrier). The rotary motor 6 is started, which drives the rotating disk 5 to rotate clockwise, causing the workpiece to be sewn inside the rotating disk to rotate. The workpiece is then fed into the guide rail 7 through the gap between the tilting baffle 11 and the rotating disk 5. The height limiting components at the inlet end of the guide rail 7 and the top of the rail tilt the workpiece to a horizontal position. The bottom of the guide rail 7 is the upper surface area of ​​the rotating disk 5. The laid-down workpiece enters the loading rail 8 as the rotating disk 5 rotates. The loading rail 8 is connected to the guide rail by a ramp. The directional rail 9 is perpendicular to the loading rail 8 and is arranged at an angle. The workpiece enters the directional rail 9 in an upright position and enters the positioning boss under the guidance of the vertical positioning channel 29. The V-shaped groove on the positioning boss makes the workpiece coaxial with the core rod of the sewing mechanism. At this time, the loading is completed. (2) Seam sewing mechanism (e.g.) Figure 4-6 (as shown) After the material is loaded, the workpiece enters the predetermined position and is positioned. The position sensor (located in the V-groove) sends a signal to the PLC control unit. After receiving the signal, the PLC control unit controls the drive motor 15 to start. The drive motor 15 drives the disc 16, which drives the bearing 17 to rotate clockwise. The positioning frame 18 pulls the slider 19 to move along the guide rail 20 towards the workpiece. At the same time, the positioning frame 18 drives the mandrel 13 to make a horizontal feeding motion, and the frustum structure of the mandrel 13 is gradually inserted into the workpiece inner hole on the positioning boss 10 until the frustum structure of the mandrel 13 is flush with the end face of the positioning boss 10 (at this time, the mandrel fully supports the inner wall of the workpiece). The drive motor continues to drive the bearing to rotate, the positioning frame continues to move forward, and the mandrel pushes the workpiece to move along the V-groove of the positioning boss until the feed stroke of the positioning frame ends. By utilizing the cooperation between the mandrel's frustum structure and the positioning boss, the workpiece's slot forming is completed, so that the workpiece's slot opening reaches the preset size requirements. After the stitching is formed, the drive motor drives the bearing to continue rotating, and the slider begins to move along the slide rail away from the positioning boss, and the mandrel then performs a material retraction movement. (3) Feeding mechanism: After the stitching is completed, the material unloading begins. The drive motor drives the bearing to continue rotating, and the positioning frame drives the mandrel to begin retracting. The stitched workpiece is blocked by the end face of the guide table, thus separating it from the retracting mandrel. After the workpiece falls into the unloading trough 24, the pusher cylinder 26 pushes the workpiece into the discharge trough 25. After entering the discharge trough, due to the trough's angled placement, the workpiece slides down to the storage area under gravity. At this point, the operation is complete.

Claims

1. An automatic stitching device for a shock-absorbing sliding bushing, characterized in that, include: The feeding mechanism, the sewing mechanism, and the unloading mechanism; The feeding mechanism includes a rotating disk, a rotary motor, a guide rail, a feeding rail, a positioning rail, and a positioning boss; the rotary motor is driven and connected to the rotating disk, and the positioning boss is provided with a V-shaped groove; the guide rail is eccentrically arranged on the rotating disk, and its inlet end and bottom are respectively connected to the rotating disk, and is provided with a height limiting component for adjusting the workpiece to a horizontal posture. The outlet end of the guide rail extends downward at an angle to form a feeding rail, and the outlet end of the feeding rail extends laterally vertically and downward at an angle to form a positioning rail; the outlet end of the positioning rail is located above the V-groove, so that the workpiece enters the V-groove in a vertical position. The stitching mechanism includes a reciprocating motion component, a mandrel, and a guide table; the head of the mandrel is provided with a frustum structure that matches the inner diameter of the sliding bushing, and the mandrel passes through the guide table; the reciprocating motion component is driven to the mandrel, driving the mandrel to reciprocate linearly along the guide table toward the V-groove direction; The feeding mechanism includes a material return groove and a material discharge groove. The material return groove is disposed between the positioning boss and the guide table, and the material discharge groove and the material return groove are arranged at an angle.

2. An automatic stitching device for a shock-absorbing sliding bushing according to claim 1, characterized in that, The height limiting component includes a folding baffle located at the inlet end of the guide rail, and folding rods spaced apart along the top of the guide rail; A gap is formed between the bottom edge of the tilting baffle and the surface of the rotating disk, and the height of the gap is less than the outer diameter of the workpiece; the distance between the tilting rod and the bottom of the guide rail is also less than the outer diameter of the workpiece.

3. An automatic stitching device for a shock-absorbing sliding bushing according to claim 1, characterized in that, It also includes a PLC control unit, and a position sensor is provided at the V-groove. The PLC control unit is communicatively connected to the position sensor, the rotary motor, and the reciprocating motion component.

4. An automatic stitching device for a shock-absorbing sliding bushing according to claim 1, characterized in that, The positioning boss has a vertically arranged positioning channel above the V-groove, and the positioning channel connects the positioning track and the V-groove.

5. An automatic stitching device for a shock-absorbing sliding bushing according to claim 1, characterized in that, The reciprocating motion assembly includes: a drive motor, a disc, a bearing, a positioning frame, a pair of sliders, and a pair of guide rails; The bearing is eccentrically positioned on the end face of the disk and confined within the positioning frame; a pair of sliders are slidably engaged with a pair of parallel guide rails, and the positioning frame is fixedly connected to the pair of sliders; The drive motor is connected to the disc drive and is used to drive the bearing to rotate circumferentially, thereby driving the positioning frame to reciprocate linearly along the guide rail. The tail end of the mandrel is fixedly connected to the positioning frame.

6. An automatic stitching device for a shock-absorbing sliding bushing according to claim 5, characterized in that, The disc end face is provided with a bearing adjustment frame, and the bearing adjustment frame is provided with a sliding groove extending radially along the disc; the bearing inner ring is provided with a mounting post, and the mounting post is slidably engaged with the sliding groove through an adjusting screw, and the adjusting screw is provided with a locking nut for adjusting the bearing eccentricity.

7. An automatic stitching device for a shock-absorbing sliding bushing according to claim 1, characterized in that, A pusher cylinder is provided on one side of the unloading groove. The pusher cylinder is arranged opposite to the unloading groove and is used to push the workpiece with the completed stitching into the unloading groove.

8. An automatic stitching device for a shock-absorbing sliding bushing according to claim 1, characterized in that, A baffle plate is hinged to the top of the feeding trough.

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