Bearing pinning machine

Abstract

This invention discloses a bearing pinning machine, belonging to the technical field of bearing assembly equipment. It includes a main cabinet, a worktable supported on the main cabinet, first and second feeding assemblies, two sets of pinning assemblies arranged side-by-side, a tilting assembly, a conveying drive assembly, and an adjusting assembly. The first and second feeding assemblies respectively convey the bearing outer ring and cage. The two pinning assemblies cooperate to accommodate the pinning of double-row roller bearings. The tilting assembly is located between the two pinning assemblies, receiving the bearing via a clamping cylinder and being driven to tilt by a rotary motor. The conveying drive assembly is connected to the adjusting assembly for automatic conveying of the bearing between different workstations. This invention achieves automatic attitude conversion and continuous double-sided assembly of double-row roller bearings through seamless linkage between the two pinning workstations and the tilting assembly, avoiding positioning errors caused by manual secondary clamping, and improving assembly efficiency and meeting the requirements of integrated co-line production.

Description

Technical Field

[0001] This invention relates to the field of transport vehicle technology, and more particularly to a bearing pinning machine. Background Technology

[0002] In the automated production of universal joint bearings or needle roller bearings, the bearing pinning machine is a key piece of equipment for achieving precision assembly of needle rollers. Existing bearing pinning machines are usually equipped with a linear reciprocating feeding mechanism to transport the outer ring (sleeve) of the bearing from the feeding slide to the pinning station. Its working principle is usually to use a metal push plate connected to the drive cylinder or module. The front end of the push plate has a V-shaped or U-shaped positioning groove that matches the outer diameter of the bearing. During operation, the push plate moves forward and uses the positioning groove to hold the outer wall of the bearing outer ring, pushing it horizontally to the predetermined processing position. Then, the pinning head above performs the needle roller pressing operation.

[0003] Most existing bearing pinning equipment is only suitable for assembling single-row roller bearings. Double-row roller bearings require a ring of pins to be pressed into the upper and lower ends of the bearing. However, existing single-row pinning machines are usually only equipped with a single pinning station. After the first side is pinned, the equipment cannot automatically complete the workpiece posture conversion and secondary positioning. As a result, when producing double-row roller bearings, it is necessary to rely on manual removal of the bearing, manual flipping, and repositioning, or to connect two independent pinning machines in series. This is not only cumbersome and time-consuming, reducing production efficiency and increasing labor and equipment costs, but also inevitably produces positioning errors due to secondary manual clamping or cross-equipment transfer. This can easily lead to center offset, damage to the cage or bearing hole during the second row pinning, making it difficult to achieve efficient and high-precision integrated co-line production of double-row roller bearings.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0005] This invention provides a bearing pinning machine to solve the technical problem that existing bearing pinning equipment is usually only suitable for single-row roller bearings, which leads to the need for manual intervention when producing double-row roller bearings, resulting in low production efficiency and secondary clamping and positioning errors.

[0006] The present invention adopts the following technical solution: a bearing pinning machine, comprising a cabinet body; The working plate is fixed on the main body of the cabinet and is used to support the bearing working position. One side of the working plate has a constraint strip. The first feeding assembly is installed on the main body of the cabinet and is used to transport the outer ring of the bearing; The second feeding assembly is installed on the main body of the cabinet and is used to transport the retainer. The needle loading assembly consists of two sets arranged side by side on one side of the work plate. Each set includes a pressing unit, a needle feeding unit, and a rotary indexing unit. The two sets of needle loading assemblies are used to adapt to the needle loading of double-row roller bearings and to press the roller needles into the outer ring of the bearing. A flipping assembly, disposed between the two sets of needle loading assemblies, includes a second rotary motor and a clamping cylinder, used to receive and flip the bearing via the clamping cylinder and driven by the second rotary motor. A drive assembly, mounted on the main body of the cabinet and located on one side of the work plate, is used to provide horizontal conveying power; An adjustment component, connected to the output end of the drive component, is used to transport the bearing between different workstations.

[0007] Furthermore, the adjustment assembly includes a lower pusher plate and an upper pusher plate stacked together. The lower pusher plate has a plurality of first U-shaped grooves spaced apart, and the upper pusher plate has a plurality of second U-shaped grooves correspondingly formed. In the initial state, the first U-shaped grooves and the second U-shaped grooves are aligned vertically. A sliding pin block is fixed on the bottom surface of the upper pusher plate, and a sliding pin groove is formed on the lower pusher plate for the sliding pin block to slide in. A return spring is connected between the sliding pin block and the inner wall of the sliding pin groove.

[0008] Furthermore, the adjustment assembly also includes a fixed block, a sliding rod, a guide rod, and a triangular inclined block. The fixed block is fixed to both sides of the working plate, the guide rod is fixed between the two sets of fixed blocks, the sliding rod is slidably sleeved on the guide rod and has a limiting spring connected to both ends, the other end of the limiting spring is connected to the fixed block, and the triangular inclined block is symmetrically fixed to the side of the sliding rod. The linkage adjustment structure includes a first sliding column fixed to the bottom surface of the upper push plate and a second sliding column fixed to the bottom surface of the lower push plate. The first sliding column movably passes through the lower push plate, and the lower push plate has an open sliding groove for displacement of the first sliding column. The first sliding column and the second sliding column are respectively used to abut against the inclined surface of the corresponding triangular inclined block. When the lower push plate moves closer to the working plate, the first sliding column and the second sliding column are squeezed by the inclined surface, driving the upper push plate and the lower push plate to move away from each other in the horizontal direction.

[0009] Furthermore, the drive assembly includes a slide rail, a sliding block, a main drive cylinder, a displacement cylinder, and a horizontal panel. The slide rail and the main drive cylinder are both fixed to the main body of the cabinet parallel to the work plate. The sliding block is slidably disposed on the slide rail and there are two sets of them. The two sets of sliding blocks are connected by a connecting frame. The displacement cylinder is horizontally fixed on the sliding block, and its telescopic end is connected to the horizontal panel. The lower push plate is connected to the side of the horizontal panel and is used to move closer to or further away from the work plate under the drive of the displacement cylinder, and to move along the bearing conveying direction under the drive of the main drive cylinder.

[0010] Furthermore, a locking component is provided corresponding to the position of the second feeding component. The locking component includes a pressing unit and a sensing unit. Several protrusions are formed on the upper and lower pushing plates due to the interval distribution of the second U-shaped groove and the first U-shaped groove. The pressing unit is provided on the protrusions of the two upper pushing plates corresponding to the position of the second feeding component. The pressing unit includes two sets of downward pressing rods in an inverted L shape. The two sets of downward pressing rods are correspondingly provided on the two protrusions, symmetrically arranged, and arranged in different ways.

[0011] Furthermore, a set of the downward pressing rods is configured to move downward through the protrusion of the upper push plate on the right side. A second fixing plate is fixedly sleeved on the downward pressing rod at this position. The second fixing plate is movably disposed on the upper surface of the corresponding protrusion. A second spring is sleeved on the downward pressing rod. The two ends of the second spring are respectively connected to the bottom surface of the second fixing plate and the upper surface of the protrusion. A second sliding pin is fixed to the side of the downward pressing rod at this position. A second triangular contact block is fixed to the bottom surface of the protrusion of the corresponding lower push plate. The second triangular contact block is located in the gap between the protrusion of the upper push plate and the protrusion of the lower push plate, and its inclined surface is adapted to abut against the second sliding pin to drive the downward pressing rod to move downward.

[0012] Furthermore, another set of the pressing rods is configured to move downwards through the protrusion of the upper push plate on the left side. At this position, the pressing rod moves downwards through the protrusions of the upper and lower push plates in sequence, and its bottom end is connected to a first spring. One end of the first spring is connected to a first fixing plate, which is fixed to the bottom surface of the protrusion of the lower push plate at this position. The protrusion of the lower push plate has a through groove for the pressing rod to slide vertically. Correspondingly, the upper push plate has a clearance groove for the pressing rod to move horizontally. The bottom surface of the upper push plate is fixed with a first triangular contact block, which is located in the gap between the protrusions of the upper and lower push plates. The side of the pressing rod is fixed with a first sliding pin, which is adapted to abut against the inclined surface of the first triangular contact block to drive the pressing rod to move downwards.

[0013] Furthermore, the sensing unit is disposed on the inner side of each protrusion formed on the upper push plate, and a sensing unit is provided at the position of each second U-shaped groove. The protrusion has an inner groove on the inner side facing the outer ring of the bearing. The sensing unit includes a limiting spring, a contact clamp, and a pressure sensor. The pressure sensor is fixedly disposed on the inner wall of the inner groove. The limiting spring is disposed in the inner groove, with one end abutting against the inner bottom wall of the inner groove and the other end connected to the inner side of the contact clamp. The contact clamp is movably disposed at the opening of the inner groove and is adapted to protrude to contact the side of the outer ring of the bearing. The sensing end of the pressure sensor is adapted to contact the inner side of the contact clamp to sense the contact pressure received by the contact clamp.

[0014] Furthermore, each needle loading assembly includes a mounting bracket, a pressing cylinder, a sliding panel, a needle loading head, a detection bracket, and a laser detection sensor. The mounting bracket is fixed to the main body of the cabinet. The pressing cylinder is vertically fixed to the top of the mounting bracket. The sliding panel is slidably disposed on the side of the mounting bracket. The telescopic end of the pressing cylinder is connected to the top surface of the sliding panel. The needle loading head is fixed on the sliding panel and has an inclined material drop hole and space for horizontal displacement of the pressing end inside. A pressing cylinder is provided on the side of the needle loading head. The detection brackets are symmetrically disposed on both sides of the mounting bracket. The laser detection sensor is obliquely fixed on the detection bracket for detecting missing needles in the inner ring of the bearing.

[0015] Furthermore, each set of needle-loading assemblies also includes a horizontal frame, a first rotary motor, a first pulley, a second pulley, an arched frame, a splined shaft, and a support platform. The horizontal frame is positioned below the work plate at the corresponding location. The first rotary motor is fixed to the horizontal frame, and the first pulley is fixed to the output end of the first rotary motor. The second pulley is rotatably mounted on the horizontal frame and is connected to the first pulley via a belt. The arched frame is fixed to the bottom surface of the horizontal frame, and a lifting cylinder is fixed to the bottom surface of the arched frame. The splined shaft is fitted with the center clearance of the second pulley, and a support platform is fixedly connected to the top of the splined shaft. The support platform penetrates and is embedded in the work plate and is used to support the outer ring of the bearing. The telescopic end of the lifting cylinder is connected to the bottom of the splined shaft via a rotary joint.

[0016] The technical solutions adopted in the embodiments of the present invention can achieve the following beneficial effects: This invention discloses a bearing pinning machine. By arranging two pinning assemblies side by side on one side of a work plate, and setting a flipping assembly containing a second rotary motor and a clamping cylinder between the conveying paths of the two pinning assemblies, and coordinating with the automated conveying of the drive and adjustment components, the automated assembly requirements of double-row roller bearings are met on a single machine. After the first pinning assembly completes the pinning of the first side of the bearing, the clamping cylinder of the flipping assembly automatically receives and clamps the bearing, which is then precisely flipped by the second rotary motor. Subsequently, it seamlessly connects to the second pinning assembly for the assembly of the second side. This eliminates the tedious process of manual material handling, flipping, or cross-equipment transfer, improving production efficiency and reducing labor and equipment costs. It avoids center offset and positioning errors caused by secondary manual clamping or cross-line transfer, effectively preventing difficulties in pinning and damage to the cage or bearing opening, and realizing efficient and high-precision integrated co-line production of double-row roller bearings. Attached Figure Description

[0017] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0018] In the attached diagram: Figure 1 This is an overall schematic diagram of a bearing pinning machine according to the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of a partial structure; Figure 3 For the present invention Figure 2 A schematic diagram of a partial structure; Figure 4 For the present invention Figure 3 A magnified structural diagram at point A; Figure 5 For the present invention Figure 3 A schematic diagram of a partial structure; Figure 6 For the present invention Figure 5 Schematic diagram of the middle-mounted needle assembly; Figure 7 For the present invention Figure 6 A schematic diagram of a partial structure; Figure 8 For the present invention Figure 7 A magnified structural diagram at point B; Figure 9 For the present invention Figure 5 A schematic diagram of a partial structure; Figure 10 For the present invention Figure 9 A magnified structural diagram at point C; Figure 11 For the present invention Figure 9 A schematic diagram of the bottom structure; Figure 12 For the present invention Figure 11 A magnified structural diagram at point D; Figure 13 For the present invention Figure 11 A schematic diagram of a partial structure; Figure 14 For the present invention Figure 13 A schematic diagram of a partial structure; Figure 15 For the present invention Figure 14 A schematic diagram of a partial structure; Figure 16 For the present invention Figure 5 A magnified structural diagram at point E; Figure label: 1. Cabinet body; 11. Sheet metal protective cover; 12. Touch screen; 13. Safety window; 14. Support column; 15. Work plate; 151. Restraint bar; 2. First loading assembly; 21. Conveyor bracket; 22. First conveyor belt; 3. Second loading assembly; 31. Second conveyor belt; 32. Mounting base; 33. Horizontal beam; 34. Horizontal guide rail; 35. Slider; 36. L-shaped plate; 37. Sliding frame; 38. Pneumatic gripper; 39. Adjusting cylinder; 310. Right angle frame; 311. Lifting cylinder 4. Needle loading assembly; 41. Mounting bracket; 42. Pressing cylinder; 43. Sliding panel; 44. Needle loading head; 441. Material drop hole; 45. Detection bracket; 451. Laser detection sensor; 46. Horizontal frame; 47. First rotary motor; 48. First pulley; 49. Second pulley; 410. Arch frame; 411. Lifting cylinder; 412. Support platform; 413. Pressing end; 414. Pressing cylinder; 415. Needle pusher block; 5. Tilting assembly; 51. Fixing frame; 52. ... 53. Rotary motor; 531. Clamping cylinder; 6. Supporting gripper; 6. Drive assembly; 61. Slide rail; 62. Sliding block; 63. Main drive cylinder; 64. Displacement cylinder; 66. Horizontal panel; 67. Lower pusher plate; 671. Open slide groove; 672. First U-shaped groove; 68. Connecting frame; 7. Adjustment assembly; 71. Fixing block; 72. Sliding rod; 73. Guide rod; 74. Restricting spring; 75. Upper pusher plate; 751. Second U-shaped groove; 752. Inner groove; 753. Clearance 76. Groove; 77. Triangular inclined block; 78. First sliding column; 79. Second sliding column; 80. Locking assembly; 81. Downward pressure rod; 82. Second fixing plate; 83. Limiting spring; 831. Contact clamp block; 84. Pressure sensor; 85. First triangular contact block; 86. First sliding pin shaft; 87. First spring; 88. First fixing plate; 810. Second spring; 812. Second sliding pin shaft; 813. Second triangular contact block; 9. Weighing assembly; 91. Support rod frame; 92. Withdrawal cylinder; 93. Support block. Detailed Implementation

[0019] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0020] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Reference Figures 1 to 16As shown, this embodiment of the invention provides a bearing pinning machine, including a cabinet body 1, a first feeding component 2, a second feeding component 3, a pinning component 4, a flipping component 5, a driving component 6, an adjusting component 7, and a locking component 8. A support column 14 is fixed on the cabinet body 1, and a working plate 15 is supported at its top. The working plate 15 is used to provide support for the bearing processing. A constraint strip 151 is fixed on one side of the working plate to limit the lateral displacement of the bearing during the processing. The cabinet body 1 is provided with a sheet metal protective cover 11, which integrates a touch screen 12 and a safety window 13 for human-machine interaction and status observation.

[0022] like Figures 1-5 As shown, this device has two sets of feeding structures, including a first feeding assembly 2 for conveying the outer ring of the bearing and a second feeding assembly 3 for conveying the cage. The first feeding assembly 2 includes a first conveyor belt 22 fixedly supported on one side of the cabinet body 1 by a conveyor bracket 21, and adjustable guide side plates are provided on both sides of the conveyor belt. The spacing between them is slightly larger than the diameter of the outer ring of the bearing, thereby constraining the bearing on a predetermined center path. The top plane of the first conveyor belt 22 is flush with the bearing plane of the work plate 15, and the conveyor belt is arranged horizontally, with its end adjacent to the starting position of the work plate 15.

[0023] The second feeding assembly 3 includes a second conveyor belt 31, a mounting base 32, a horizontal beam 33, a horizontal guide rail 34, a slider 35, an L-shaped plate 36, a sliding frame 37, a support spring, a pneumatic gripper 38, an adjusting cylinder 39, a right-angle frame 310, and a lifting cylinder 311. The second conveyor belt 31 is fixed to the main body of the cabinet 1 and is located adjacent to the first feeding assembly 2. It is used to feed the retainer to the predetermined feeding position on the work plate 15. The mounting base 32 is fixed to the main body of the cabinet 1 and is located on the side of the second conveyor belt 31. The horizontal beam 33 is horizontally fixed to the top of the mounting base 32 and is U-shaped. The structure has two sets of horizontal guide rails 34 fixed parallel to each other on the side surface of the horizontal beam 33. Each set of horizontal guide rails 34 has a slider 35 slidably mounted on it. Each slider 35 has an L-shaped plate 36 vertically fixed on it. The L-shaped plates 36 on the two sliders 35 are designed with different shapes so that the two L-shaped plates 36 can avoid each other when they move horizontally and meet. Specifically, the horizontal arm of one L-shaped plate 36 is higher and the horizontal arm of the other L-shaped plate 36 is lower, so that when the two sliders 35 move towards each other and meet, their structures are misaligned in space and do not interfere with each other.

[0024] The sliding frame 37 is vertically slidably connected to the vertical end of the L-shaped plate 36. The support spring is connected between the bottom of the sliding frame 37 and the horizontal end of the L-shaped plate 36 to provide an initial upward support force for the sliding frame 37 and the pneumatic gripper 38 fixed on its bottom surface. Two sets of adjusting cylinders 39 are fixed to one end of the horizontal beam 33. Their telescopic ends pass through one end of the horizontal beam 33 and are connected to the corresponding sliders 35. A right-angle frame 310 is fixed on the upper surface of the horizontal beam 33. The lifting cylinder 311 is vertically fixed to the horizontal end of the right-angle frame 310.

[0025] In actual operation, the two sets of adjusting cylinders 39 independently drive the corresponding sliders 35 to reciprocate along the horizontal guide rail 34, realizing the rapid switching of the two pneumatic grippers 38 between the pick-up position and the placement position. When the pneumatic gripper 38 carrying the retainer moves to the top of the working position, the lifting cylinder 311 is activated. Its extension end passes vertically downward through the right-angle frame 310 and contacts the upper surface of the sliding frame 37. The lifting cylinder 311 overcomes the elastic force of the support spring by applying downward pressure, pushing the sliding frame 37 and the pneumatic gripper 38 to move downward in the vertical direction, thereby accurately placing the retainer into the bearing outer ring located at the working position of the working plate 15.

[0026] Reference Figures 4-5 and Figure 8 As shown, after the bearing outer ring and cage are positioned, the conveyor line sends it to the needle loading station. The device has two needle loading assemblies 4 arranged side by side, located on one side of the work plate 15, for rolling needles onto the two sides of the bearing. Each needle loading assembly 4 includes a mounting bracket 41 fixed on the main body of the cabinet 1. A pressing cylinder 42 is vertically fixed at the top of the mounting bracket 41. The telescopic end of the pressing cylinder 42 is connected to a sliding panel 43. The sliding panel 43 slides vertically along the guide rail on the side of the mounting bracket 41. A needle loading head 44 is fixed on the sliding panel 43. The needle loading head 44 moves up and down with it.

[0027] like Figure 8As shown, a horizontal guide channel is provided through the needle loading head 44. A pressing end 413 is slidably arranged in the horizontal guide channel. The rear end of the pressing end 413 extends out of the needle loading head 44 and is connected to the telescopic rod of the pressing cylinder 414 fixed on the side. The pressing cylinder 414 drives it to reciprocate in the horizontal direction. An inclined dropping hole 441 is provided on the upper surface of the needle loading head 44. The dropping hole 441 is connected to the horizontal guide channel. The needle supply unit includes a vibratory plate and a feeding hose (not shown in the figure) arranged next to the main body 1 of the cabinet. The needle supply unit feeds the roller needles into the dropping hole 441 through the feeding hose. A pusher block 415 is provided at the intersection of the bottom end of the dropping hole 441 and the horizontal guide channel. The pusher block 415 is fixed in front of the pushing path of the pressing end 413. In actual use, the pressing cylinder 414 drives the pressing end 413 to move horizontally and push the falling roller needles into the gap between the outer ring of the bearing and the cage.

[0028] To achieve needle loading quality inspection, detection brackets 45 are symmetrically arranged on both sides of the mounting bracket 41. A laser detection sensor 451 is fixed obliquely on the detection bracket 45. The laser detection sensor 451 is set at an angle downward to avoid the interference zone of the needle loading head 44 in the middle and focuses on the inner ring of the bearing to detect the missing needle situation of the inner ring of the bearing in real time.

[0029] To achieve quality inspection of the finished bearing after needle loading and automatically reject unqualified products, a weighing component 9 is installed on the main body 1 of the cabinet and located on one side of the second needle loading assembly 4. The weighing component 9 includes a support frame 91 that is vertically fixed on the main body 1 of the cabinet. A withdrawal cylinder 92 is horizontally fixed on the support frame 91. A support block 93 is fixed to the telescopic end of the withdrawal cylinder 92. A weight sensor (not shown in the figure) is embedded in the support block 93 to detect the weight of the bearing after needle loading. The support block 93 is also movably inserted into the work plate 15 from the side to fill in and form a temporary conveying bearing surface at the inspection station.

[0030] In actual operation, the assembled bearing is conveyed to the top of the support block 93. The weight sensor detects the overall weight of the bearing after needle insertion. When the weight is qualified, the bearing continues to be conveyed downstream. When the weight is unqualified, such as due to missing needles causing the weight to be too light, the extraction cylinder 92 retracts, driving the support block 93 to be pulled back to the working position. At this time, the unqualified bearing located on it is blocked by the lateral restraint bar 151 on the opposite side and cannot move with it. As a result, it loses the support at the bottom and falls downward, realizing the automatic rejection of defective products. In actual use, a receiving component can be set below this rejection station to centrally receive unqualified bearings.

[0031] like Figures 6-8As shown, in order to cooperate with the pressing action above, a rotary indexing unit is provided below the work plate 15 at the position corresponding to the needle assembly 4. The rotary indexing unit includes a horizontal frame 46, a first rotary motor 47, a first pulley 48, a second pulley 49, an arched frame 410, a splined shaft, and a support platform 412. The horizontal frame 46 is located below the work plate 15. The first rotary motor 47 is fixed on the horizontal frame 46, and its output end is fixed with the first pulley 48. The second pulley 49 is rotatably mounted on the horizontal frame 46 and is connected to the first pulley 48 through a belt.

[0032] An arched frame 410 is fixed to the bottom surface of a horizontal frame 46. A lifting cylinder 411 is fixed to the bottom surface of the arched frame 410. A spline shaft is fitted with the center clearance of the second pulley 49. The spline shaft passes through the center of the pulley and can slide up and down but rotate synchronously with the pulley. A support platform 412 is fixedly connected to the top of the spline shaft. The support platform 412 is embedded through the working plate 15 and is used to support the outer ring of the bearing. The telescopic end of the lifting cylinder 411 is connected to the bottom of the spline shaft through a rotary joint.

[0033] During operation, the lifting cylinder 411 drives the spline shaft and support platform 412 to move upward, lifting the outer ring of the bearing away from the conveying surface. Subsequently, the first rotary motor 47 drives the first pulley 48 to rotate, which is then transmitted to the second pulley 49 via belt. The second pulley 49 drives the spline shaft and support platform 412 to perform precise needle indexing rotation.

[0034] Reference Figure 5 As shown, a flipping assembly 5 is provided between the two assembly pin assemblies 4. The flipping assembly 5 includes a fixing frame 51 that is vertically fixed on the main body of the cabinet 1, and a second rotary motor 52 installed on the side of the fixing frame 51. The output end of the second rotary motor 52 is connected to a clamping cylinder 53. The end of the clamping cylinder 53 is provided with a support claw 531. The support claw 531 is designed as a double claw structure with vertical symmetry, including an upper claw and a lower claw that are vertically spaced in the initial state. The height of the lower claw, which is initially located at the bottom, is flush with the bearing plane of the work plate 15, and is used to form a temporary bearing position when the outer ring of the bearing enters the flipping station.

[0035] During operation, when the bearing that has completed single-sided operation via the first assembly needle assembly 4 is transported to the middle position, the outer ring of the bearing is located on the lower gripper. Subsequently, the clamping cylinder 53 drives the support gripper 531 to close to clamp the outer ring of the bearing. The second rotary motor 52 drives the gripper to rotate 180 degrees to complete the bearing flipping. After flipping into place, the upper gripper that was originally on top rotates to the bottom and mates with the conveying plane. At this time, the clamping cylinder 53 releases, and the flipped outer ring of the bearing is placed on the temporary bearing position (which is transformed from the original upper gripper) so that the bearing can continue to flow to the next station for the needle loading operation on the other side.

[0036] To address the issue that existing push plate positioning grooves are typically a fixed, integrated structure, making it difficult to adapt to the co-line production of bearings with different diameters, specifically, because the depth and opening angle of the V-groove or U-groove are fixed, when conveying bearings of different outer diameters, the seating depth of large-diameter bearings and small-diameter bearings in the V-groove differs. This causes the geometric center of the material to shift backward relative to the theoretical center of the needle-loading station when it is pushed to the same mechanical stop position. This center deviation makes it impossible for the needle-loading head to be accurately aligned, which can lead to difficulties in needle roller assembly or, in severe cases, damage to the cage or bearing opening. This forces the equipment to be disassembled and replaced with a dedicated push plate when changing product models.

[0037] Reference Figures 9-14 As shown, the bearing conveying and positioning of this device is completed by the drive assembly 6 and the adjustment assembly 7. The drive assembly 6 is located on one side of the working plate 15 and includes a slide rail 61 and a main drive cylinder 63 that are fixed parallel to the main body 1 of the cabinet. Two sets of sliding blocks 62 are slidably arranged on the slide rail 61. The two sets of sliding blocks 62 are fixedly connected by a connecting frame 68 to maintain synchronization. The main drive cylinder 63 is fixed by a mounting frame and connected to the side of a set of sliding blocks 62. It is used to drive the sliding blocks 62 to make longitudinal reciprocating motion along the bearing conveying direction. A displacement cylinder 64 is horizontally fixed on each sliding block 62. The telescopic end of the displacement cylinder 64 is fixedly connected to a horizontal panel 66. A lower push plate 67 is connected to the side of the horizontal panel 66 by a slide rail slider. During operation, the displacement cylinder 64 drives the lower push plate 67 to make a lateral feed motion relative to the working plate 15. In conjunction with the longitudinal movement of the main drive cylinder 63, a rectangular cycle action of clamping the workpiece, longitudinal conveying, releasing the workpiece, and lateral retraction is realized.

[0038] The adjustment component 7 adopts a stacked double-plate design, including an upper pusher plate 75 that is slidably disposed on the lower pusher plate 67. The lower pusher plate 67 has a plurality of first U-shaped grooves 672 spaced apart, and the upper pusher plate 75 has a plurality of second U-shaped grooves 751 correspondingly provided. In the initial state, the first U-shaped grooves 672 and the second U-shaped grooves 751 are vertically aligned. In order to ensure this alignment and allow relative sliding, a sliding pin block (not shown in the figure) is fixed on the bottom surface of the upper pusher plate 75. A sliding pin groove for the sliding pin block to slide is provided on the lower pusher plate 67. A return spring is connected between the sliding pin block and the inner wall of the sliding pin groove to maintain the initial alignment state by means of spring force.

[0039] To achieve automatic adaptation to different bearing diameters, the adjustment assembly 7 also includes a fixed block 71, a sliding rod 72, a guide rod 73, and a triangular wedge block 76. The fixed block 71 is fixed on both sides of the working plate 15, the guide rod 73 is fixed between the two sets of fixed blocks 71, the sliding rod 72 is slidably sleeved on the guide rod 73, and its two ends are respectively connected to a limiting spring 74. The other end of the limiting spring 74 is connected to the fixed block 71, so that the sliding rod 72 has an elastic restoring ability. The triangular wedge blocks 76 are symmetrically fixed on the side of the sliding rod 72, and the inclined surfaces of the two triangular wedge blocks 76 are both set outward.

[0040] A linkage adjustment structure is provided between the upper push plate 75 and the lower push plate 67. The linkage adjustment structure includes a first sliding column 77 fixed on the bottom surface of the upper push plate 75 and a second sliding column 78 fixed on the bottom surface of the lower push plate 67. The first sliding column 77 moves through the lower push plate 67, and the lower push plate 67 is provided with an open sliding groove 671 for the displacement of the first sliding column 77. The first sliding column 77 and the second sliding column 78 are respectively used to abut against the inclined surface of the corresponding triangular inclined block 76.

[0041] When the lower pusher plate 67 moves closer to the working plate 15 to clamp the bearing under the drive of the displacement cylinder 64, the first sliding column 77 and the second sliding column 78 will come into contact and be squeezed by the inclined surface of the triangular wedge block 76. This squeezing force drives the upper pusher plate 75 and the lower pusher plate 67 to move away from each other in the horizontal direction, thereby changing the clamping distance after the first U-shaped groove 672 and the second U-shaped groove 751 overlap, so as to realize automatic adaptation to the current bearing diameter.

[0042] Reference Figures 10-15 As shown, in order to ensure the stability of the bearing during the conveying and processing process, the device also integrates a locking assembly 8 and a sensing unit. The locking assembly 8 is mainly set at the position corresponding to the second feeding assembly 3 (i.e., the material position on the retainer). Due to the interval distribution of the second U-shaped groove 751 and the first U-shaped groove 672, the upper pusher plate 75 and the lower pusher plate 67 form several protrusions on the edge of the plate. The pressing unit of the locking assembly 8 is arranged using the space of these protrusions.

[0043] The clamping unit includes two sets of inverted L-shaped downward pressure rods 81, symmetrically arranged on the left and right protrusions respectively. However, in order to cooperate with the relative movement logic of the double-layer plate, different installation structures are adopted on the left and right sides: The right-side locking structure is (as shown in the example) Figure 13 and Figure 15As shown), at this position, the downward pressing rod 81 moves downward through the protrusion of the upper pusher plate 75. A second fixing plate 82 is fixedly sleeved on the rod body of the downward pressing rod 81. The second fixing plate 82 is movably mounted on the upper surface of the protrusion of the upper pusher plate 75. A second spring 810 is also sleeved on the downward pressing rod 81. The two ends of the second spring 810 abut against the bottom surface of the second fixing plate 82 and the upper surface of the protrusion of the upper pusher plate 75, respectively, thereby providing an upward restoring force for the downward pressing rod 81. A second sliding pin shaft 812 is fixed on the side of the downward pressing rod 81 where it extends into the gap between the upper pusher plate 75 and the lower pusher plate 67. Correspondingly, a second triangular contact block 813 is fixed on the bottom surface of the protrusion of the lower pusher plate 67, which contacts the second sliding pin shaft 812. The second triangular contact block 813 is located in the gap between the two protrusions of the upper pusher plate 75 and the lower pusher plate 67.

[0044] When the adjusting component 7 is activated, driving the lower pusher plate 67 to move relative to the upper pusher plate 75, the second triangular contact block 813 located at the gap moves accordingly. Its inclined surface abuts and presses against the second sliding pin shaft 812, overcoming the elastic force of the second spring 810 and forcibly driving the lower pressure rod 81 to move down, thereby pressing the bearing surface.

[0045] Left-side locking structure (such as) Figure 13 and Figure 15 As shown), at this position, the downward pressing rod 81 moves downward sequentially through the protrusions of the upper push plate 75 and the lower push plate 67. To accommodate the movement of the plates, the lower push plate 67 has a through hole for the vertical sliding of the rod, while the upper push plate 75 has a specially designed clearance groove 753 for the horizontal relative displacement of the downward pressing rod 81 (as shown). Figure 14 As shown), the bottom end of the pressing rod 81 is connected to a first spring 87, and the other end of the first spring 87 is connected to a first fixing plate 88. The first fixing plate 88 is fixed to the bottom surface of the protrusion of the lower push plate 67. A first sliding pin 86 is fixed on the side of the pressing rod 81. The first sliding pin 86 is located in the gap between the two protrusions of the upper push plate 75 and the lower push plate 67. Correspondingly, a first triangular contact block 85 that contacts the first sliding pin 86 is fixed on the bottom surface of the upper push plate 75. The first triangular contact block 85 is also located in the gap between the upper push plate 75 and the lower push plate 67.

[0046] When there is a relative displacement between the upper push plate 75 and the lower push plate 67, the upper push plate 75 drives the first triangular contact block 85 to move, and its inclined surface presses against the first sliding pin shaft 86, driving the lower pressure rod 81 on that side to move down, thereby achieving synchronous locking.

[0047] like Figure 11As shown, in order to achieve closed-loop detection at all workstations, the sensing unit is set on the inner side of each protrusion formed on the upper push plate 75 (i.e., the position corresponding to each second U-shaped groove 751). An inner groove 752 is provided on the inner side of the protrusion facing the outer ring of the bearing. The components of the sensing unit are installed in this groove. A pressure sensor 84 is fixedly installed on the inner wall of the inner groove 752. A contact clamp 831 is movably installed at the opening of the inner groove 752, and its front end is adapted to protrude from the groove opening to contact the side of the outer ring of the bearing. A limit spring 83 is provided in the inner groove 752. One end of the limit spring 83 abuts against the bottom of the groove 752, and the other end is connected to the inner side of the contact clamp 831, providing an extension force for the contact clamp 831.

[0048] When the upper pusher plate 75 and the lower pusher plate 67 move relative to each other and clamp the outer ring of the bearing, the bearing sidewall presses against the contact block 831, causing it to overcome the resistance of the limit spring 83 and retract inward. The inner side of the contact block 831 then touches and presses the sensing end of the pressure sensor 84. By reading the value of the pressure sensor 84, the system can determine whether there is material at the current station and monitor whether the clamping pressure reaches the preset standard, thereby ensuring processing safety.

[0049] Working principle: In the initial state, the first feeding component 2 conveys the outer ring of the bearing to the starting end of the working plate 15, and the second feeding component 3 conveys the cage to the position to be gripped. The main drive cylinder 63 and the displacement cylinder 64 of the drive component 6 cooperate to operate in a predetermined sequence. The main drive cylinder 63 is responsible for driving the sliding block 62 to move longitudinally along the conveying direction, while the displacement cylinder 64 is responsible for driving the horizontal panel 66 and the pusher plate assembly to move laterally perpendicular to the conveying direction. The two cooperate to perform a rectangular cyclic motion of lateral feeding, longitudinal forward movement, lateral retraction, and longitudinal reset.

[0050] During the aforementioned lateral feed stage, the adjusting component 7 comes into play. As the displacement cylinder 64 drives the pusher plate assembly closer to the working plate 15, the first sliding column 77 and the second sliding column 78, which are fixed on the bottom surface of the pusher plate, move accordingly and abut against the inclined surface of the triangular wedge block 76 fixed on the side. As the feed action continues, the inclined surface of the triangular wedge block 76 generates a component force, forcing the first sliding column 77 to drive the upper pusher plate 75 and the second sliding column 78 to drive the lower pusher plate 67 to undergo relative displacement in the horizontal direction, either towards or away from each other. This relative displacement changes the effective width of the first U-shaped groove 672 and the second U-shaped groove 751 after they overlap, so that they match and clamp the outer ring of the bearing of the current specification.

[0051] Synchronous with the adjustment action, the locking assembly 8 uses the relative displacement generated by the upper push plate 75 and the lower push plate 67 to achieve automatic locking. The first triangular contact block 85 and the second triangular contact block 813 located at the gap between the plates move with the push plate. Their inclined surfaces press the first sliding pin shaft 86 and the second sliding pin shaft 812 on the side of the lower pressure rod 81, respectively. This horizontal cam transmission action converts the horizontal relative displacement of the plates into the vertical downward movement of the lower pressure rod 81. The lower pressure rod 81 overcomes the resistance of the first spring 87 and the second spring 810 and moves downward. Its inverted L-shaped end firmly presses against the upper surface edge of the bearing outer ring to prevent the workpiece from jumping during subsequent assembly.

[0052] During the clamping process, the side wall of the bearing outer ring presses against the contact block 831, causing it to retract and then touch the pressure sensor 84 in the inner groove 752. The system receives the pressure signal fed back by the sensor, confirming on the one hand that there is material on the workstation and that the position is correct, and on the other hand, monitoring whether the clamping force meets the standard. After the detection is in place, the lifting cylinder 311 is started, driving the pneumatic gripper 38 to carry the cage vertically downward and press it into the locked bearing outer ring, completing the initial assembly of the cage. Subsequently, the drive assembly 6 enters the longitudinal forward movement stage, sending the assembled workpiece to the next needle loading station.

[0053] Subsequently, the drive assembly 6 delivers the assembled workpiece to the first assembly needle assembly 4 station. At this time, the lifting cylinder 411 located below the work plate 15 is activated, driving the spline shaft and support table 412 to lift the outer ring of the bearing, causing it to detach from the conveying surface and rotate freely. In the needle loading head 44 above, the needle rollers enter the needle pusher block 415 through the dropping hole 441. The pressing cylinder 414 drives the pressing end 413 to move horizontally forward, pushing the needle rollers into the gap between the outer ring of the bearing and the cage. At the same time, the lower rotary indexing unit... The first rotary motor 47 drives the first pulley 48 and the second pulley 49 to rotate the bearing precisely at indexing intervals. This, combined with the pusher action above, completes one revolution of needle roller pressing. During this process, the laser detection sensors 451 on both sides of the mounting bracket 41 monitor the inner ring of the bearing in real time. If a missing needle is detected, feedback is immediately provided. After this station is completed, the support table 412 descends, the bearing falls back to the conveyor line, the locking component 8 resets as the pusher plate is released, and the drive component 6 continues to convey the semi-finished bearing downstream.

[0054] When the bearing with needles installed on one side is conveyed to the flipping assembly 5 station, the clamping cylinder 53 of the flipping assembly 5 drives the support jaws 531 to close and clamp the bearing. The second rotary motor 52 drives the jaws to rotate 180 degrees, so that the side of the bearing without needles is facing upwards and placed on the bearing position formed by the rotation of the original upper jaws. The flipped bearing is then conveyed to the second needle assembly 4, and the above-mentioned lifting, indexing rotation, pressing and laser inspection process is repeated to complete the needle installation on the other side.

[0055] When the bearing is located at the weighing component 9 downstream of the second assembly needle assembly 4, it rests on the temporary bearing surface formed by the support block 93. The weight sensor embedded in the support block 93 performs overall weighing and detection on the bearing after needle loading. When the detected weight is qualified, the bearing continues to flow out with the conveyor line to complete the unloading. When the detected weight is unqualified, the extraction cylinder 92 quickly retracts, driving the support block 93 to be pulled back to the working position. At this time, the unqualified bearing is laterally blocked by the opposite constraint bar 151 and cannot move with the support block 93, thus losing its bottom support and falling downwards, achieving automatic rejection of defective products. Throughout the process, the drive component 6, the adjustment component 7, and the locking component 8 work together to automatically adapt to the bearing diameter while realizing fully automated continuous production from feeding, assembly, double-sided needle loading, weighing rejection to detection, improving production efficiency and assembly quality.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A bearing pinning machine characterized by, Including the main body of the cabinet (1); The working plate (15) is fixed on the main body of the cabinet (1) and is used to support the bearing working position. One side of the working plate (15) has a constraint strip (151). The first feeding assembly (2) is installed on the main body of the cabinet (1) and is used to feed the outer ring of the bearing; The second feeding component (3) is installed on the main body of the cabinet (1) and is used to transport the retainer; The needle loading assembly (4) is arranged in two groups side by side and located on one side of the working plate (15). Each group includes a pressing unit, a needle supply unit and a rotation indexing unit. The two groups of needle loading assemblies (4) are matched to adapt to the needle loading of double-row roller bearings and are used to press the roller needles into the outer ring of the bearing. The flipping assembly (5) is disposed between the two sets of needle loading assemblies (4), including a second rotary motor (52) and a clamping cylinder (53), for receiving and being driven by the second rotary motor (52) to flip the bearing through the clamping cylinder (53); A drive assembly (6) is disposed on the main body of the cabinet (1) and located on one side of the work plate (15) for providing horizontal conveying power; The adjustment component (7) is connected to the output end of the drive component (6) and is used to transport the bearing between different workstations.

2. The bearing pinning machine of claim 1, wherein The adjustment component (7) includes a lower pusher plate (67) and an upper pusher plate (75) stacked together. The lower pusher plate (67) has a plurality of first U-shaped grooves (672) spaced apart. The upper pusher plate (75) has a plurality of second U-shaped grooves (751) correspondingly opened. In the initial state, the first U-shaped grooves (672) and the second U-shaped grooves (751) are aligned vertically. A sliding pin block is fixed on the bottom surface of the upper pusher plate (75). A sliding pin groove for sliding the sliding pin block is opened on the lower pusher plate (67). A return spring is connected between the sliding pin block and the inner wall of the sliding pin groove.

3. A bearing pinning machine according to claim 2, wherein The adjustment assembly (7) further includes a fixed block (71), a sliding rod (72), a guide rod (73), and a triangular inclined block (76). The fixed block (71) is fixed on both sides of the working plate (15). The guide rod (73) is fixed between two sets of fixed blocks (71). The sliding rod (72) is slidably sleeved on the guide rod (73) and has a limiting spring (74) connected to both ends. The other end of the limiting spring (74) is connected to the fixed block (71). The triangular inclined block (76) is symmetrically fixed on the side of the sliding rod (72). The linkage adjustment structure includes a first sliding block fixed on the bottom surface of the upper push plate (75). The first sliding column (77) and the second sliding column (78) are fixed on the bottom surface of the lower push plate (67). The first sliding column (77) is movably inserted through the lower push plate (67). The lower push plate (67) has an open sliding groove (671) for the displacement of the first sliding column (77). The first sliding column (77) and the second sliding column (78) are respectively used to abut against the inclined surface of the corresponding triangular inclined block (76). When the lower push plate (67) moves closer to the working plate (15), the first sliding column (77) and the second sliding column (78) are driven by the inclined surface to move the upper push plate (75) and the lower push plate (67) away from each other in the horizontal direction.

4. A bearing pinning machine according to claim 3, wherein The drive assembly (6) includes a slide rail (61), a sliding block (62), a main drive cylinder (63), a displacement cylinder (64), and a horizontal panel (66). The slide rail (61) and the main drive cylinder (63) are both parallel to the work plate (15) and fixed on the cabinet body (1). The sliding block (62) is slidably arranged on the slide rail (61) and there are two sets. The two sets of sliding blocks (62) are connected by a connecting frame (68). The displacement cylinder (64) is horizontally fixed on the sliding block (62) and its telescopic end is connected to the horizontal panel (66). The lower push plate (67) is connected to the side of the horizontal panel (66) and is used to move closer to or further away from the work plate (15) under the drive of the displacement cylinder (64) and move along the bearing conveying direction under the drive of the main drive cylinder (63).

5. The bearing pinning machine of claim 3, wherein It also includes a locking component (8) provided at the position corresponding to the second feeding component (3). The locking component (8) includes a pressing unit and a sensing unit. The upper push plate (75) and the lower push plate (67) have a number of protrusions formed on them due to the interval distribution of the second U-shaped groove (751) and the first U-shaped groove (672). The pressing unit is provided on the protrusions of the two upper push plates (75) at the position corresponding to the second feeding component (3). The pressing unit includes two sets of downward pressing rods (81) in the shape of an inverted L. The two sets of downward pressing rods (81) are provided on the two protrusions respectively, symmetrically arranged, and arranged in different ways.

6. A bearing pinning machine according to claim 5, wherein A set of the pressing rods (81) are arranged to move downward through the protrusion of the upper push plate (75) on the right side. A second fixing piece (82) is fixedly sleeved on the pressing rod (81) at this position. The second fixing piece (82) is movably arranged on the upper surface of the corresponding protrusion. A second spring (810) is sleeved on the pressing rod (81). The two ends of the second spring (810) are respectively connected to the bottom surface of the second fixing piece (82) and the upper surface of the protrusion. A second sliding pin (812) is fixed on the side of the pressing rod (81) at this position. A second triangular contact block (813) is fixed on the bottom surface of the protrusion of the corresponding lower push plate (67). The second triangular contact block (813) is located at the gap between the protrusion of the upper push plate (75) and the protrusion of the lower push plate (67), and its inclined surface is adapted to abut against the second sliding pin (812) to drive the pressing rod (81) to move downward.

7. A bearing pinning machine according to claim 6, characterized in that, Another set of the pressing rods (81) are configured to move downward through the protrusion of the upper push plate (75) on the left side. The pressing rod (81) at this position moves downward through the protrusions of the upper push plate (75) and the lower push plate (67) in sequence, and its bottom end is connected to a first spring (87). One end of the first spring (87) is connected to a first fixing plate (88). The first fixing plate (88) is fixed to the bottom surface of the protrusion of the lower push plate (67) at this position. The protrusion of the lower push plate (67) is provided with a through-hole for the pressing rod (81) to slide vertically. A groove (753) is provided on the upper push plate (75) at the corresponding position to allow the lower pressure rod (81) to be in a horizontal position. The bottom surface of the upper push plate (75) is fixed with a first triangular contact block (85). The first triangular contact block (85) is located at the gap between the protrusion of the upper push plate (75) and the protrusion of the lower push plate (67). The side of the lower pressure rod (81) is fixed with a first sliding pin (86). The first sliding pin (86) is adapted to abut against the inclined surface of the first triangular contact block (85) to drive the lower pressure rod (81) to move downward.

8. A bearing pinning machine according to claim 5, characterized in that, The sensing unit is disposed on the inner side of each protrusion formed on the upper push plate (75). A sensing unit is provided at the position corresponding to each of the second U-shaped grooves (751). The inner side of the protrusion facing the outer ring of the bearing has an inner groove (752). The sensing unit includes a limiting spring (83), a contact clamp (831), and a pressure sensor (84). The pressure sensor (84) is fixedly disposed on the inner wall of the inner groove (752). The limiting spring (83) is disposed in the inner groove (752), with one end abutting against the inner bottom wall of the inner groove (752) and the other end connected to the inner side of the contact clamp (831). The contact clamp (831) is movably disposed at the opening of the inner groove (752) and is adapted to protrude to contact the side of the outer ring of the bearing. The sensing end of the pressure sensor (84) is adapted to contact the inner side of the contact clamp (831) to sense the contact pressure received by the contact clamp (831).

9. A bearing pinning machine according to claim 1, characterized in that, Each needle loading assembly (4) includes a mounting bracket (41), a pressing cylinder (42), a sliding panel (43), a needle loading head (44), a detection bracket (45), and a laser detection sensor (451). The mounting bracket (41) is fixed on the main body of the cabinet (1). The pressing cylinder (42) is vertically fixed to the top of the mounting bracket (41). The sliding panel (43) is slidably disposed on the side of the mounting bracket (41). The telescopic end of the pressing cylinder (42) is connected to the... The top surface of the sliding panel (43) is connected, and the needle loading head (44) is fixed on the sliding panel (43). An inclined material drop hole (441) and a space for horizontal displacement of the pressure end (413) are provided inside. A pressure cylinder (414) is provided on the side of the needle loading head (44). The detection bracket (45) is symmetrically arranged on both sides of the mounting bracket (41). The laser detection sensor (451) is inclinedly fixed on the detection bracket (45) for detecting the missing needle condition of the bearing inner ring.

10. A bearing pinning machine according to claim 7, characterized in that, Each set of needle-loading assemblies (4) further includes a horizontal frame (46), a first rotary motor (47), a first pulley (48), a second pulley (49), an arched frame (410), a splined shaft, and a support platform (412). The horizontal frame (46) is positioned below the work plate (15) at the corresponding location. The first rotary motor (47) is fixed to the horizontal frame (46), the first pulley (48) is fixed to the output end of the first rotary motor (47), and the second pulley (49) is rotatably mounted on the horizontal frame (46). 6) and connected to the first pulley (48) via a belt drive. The arched frame (410) is fixed to the bottom surface of the horizontal frame (46). A lifting cylinder (411) is fixed to the bottom surface of the arched frame (410). A spline shaft is fitted with the center clearance of the second pulley (49). A support platform (412) is fixedly connected to the top of the spline shaft. The support platform (412) is embedded through the working plate (15) and is used to support the outer ring of the bearing. The telescopic end of the lifting cylinder (411) is connected to the bottom of the spline shaft via a rotary joint.

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