Full-automatic continuous lettering device for bearing outer ring

Abstract

The invention discloses a full-automatic continuous lettering device for a bearing outer ring. The full-automatic continuous lettering device comprises a rack, a lettering unit, a feeding unit, a positioning unit, a clamping unit and a discharging unit. The rack comprises two front stand columns, two rear stand columns, a top frame and a middle frame. The lettering unit comprises a vertical frame installed at the front end of the top face of the rack and a numerical control lettering machine installed on the vertical frame in an up-down moving mode. The feeding unit comprises a feeding rail, a feeding blocking mechanism installed in the middle of the feeding rail and a buffering air cylinder installed at the front end of the machine frame. The positioning unit comprises a backer installed on the lettering station of the rack and a positioning air cylinder opposite to the backer. The clamping unit is arranged at the lettering station of the rack and comprises a fixed clamping wheel and a movable clamping wheel; the discharging unit comprises a discharging track, a discharging blocking mechanism installed on the rear portion of the discharging track and a discharging tray installed at the tail end of the discharging track. According to the full-automatic bearing outer ring lettering machine, full-process automatic operation from feeding, positioning, lettering to discharging of a bearing outer ring can be achieved.

Description

Technical Field

[0001] This invention relates to a fully automatic continuous engraving device for the outer ring of a bearing. Background Technology

[0002] Each bearing requires markings, typically engraved on the outer surface of the bearing's outer ring. Bearing markings are created using methods such as mechanical engraving, electro-etching, and laser engraving. Traditional bearing outer ring engraving equipment suffers from problems such as inaccurate positioning, inconsistent engraving depth, font distortion, low efficiency, and high manual labor intensity. While some automated engraving equipment can achieve a degree of automation, it still falls short in areas such as continuous feeding, precise positioning, preventing material accumulation, and seamless output connection. In particular, it lacks an efficient and stable clamping and synchronous rotation drive mechanism for the workpiece, as well as seamless collaborative control throughout the entire process of clamping, positioning, engraving, and lowering. This prevents truly fully automated continuous operation and hinders further improvements in bearing production efficiency and product quality.

[0003] In the existing technology, most common engraving equipment adopts fixed clamping or single-station operation mode, lacks the ability to continuously process multiple workpieces, and has imperfect design in terms of workpiece positioning and preventing material stacking, resulting in poor equipment stability and inability to meet the high cycle time and high stability requirements of modern intelligent production lines. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects of the prior art and provide a fully automatic continuous engraving device for bearing outer rings, which can realize the fully automated operation of bearing outer rings from feeding, positioning, engraving to discharge.

[0005] The objective of this invention is achieved as follows: a fully automatic continuous engraving device for bearing outer rings, comprising a frame, an engraving unit, a feeding unit, a positioning unit, a clamping unit, a discharging unit, a sensing unit, and a controller; wherein, The frame includes two front columns, two rear columns, a top frame fixed between the tops of the two front columns and the tops of the two rear columns and consisting of two top horizontal bars and two top vertical bars, a middle frame fixed between the middle parts of the two front columns and the middle parts of the two rear columns and consisting of two middle horizontal bars and two middle vertical bars, a lower horizontal bar spanning between the lower parts of the two front columns, two lower vertical bars fixed between the lower parts of the two front columns and the lower parts of the two rear columns, two front upper straight bars fixed one-to-one between the front parts of the two middle vertical bars and the front parts of the two top vertical bars, and two front lower straight bars fixed one-to-one between the front parts of the two lower vertical bars and the front parts of the two middle vertical bars. The engraving unit includes a stand and a CNC engraving machine; the stand is fixed between the front top surfaces of the two top longitudinal rods of the machine frame; the CNC engraving machine is mounted on the stand and can be moved up and down, with the engraving needle of the CNC engraving machine aligned with the engraving station inside the machine frame; The feeding unit includes a feeding track, a feeding blocking mechanism, and a buffer cylinder; the feeding track includes a front upper cross brace spanning the middle of two front upper straight rods, a rear upper cross brace spanning the upper part of two rear columns and higher than the front upper cross brace, and a feeding slide plate fixed between the top surface of the front upper cross brace and the top surface of the rear upper cross brace; the feeding blocking mechanism includes a first feeding blocking cylinder that is installed laterally in the middle of two top longitudinal rods of the frame in a one-to-one correspondence; the buffer cylinder is installed longitudinally in the middle of a top cross rod located at the front end of the frame, and the piston rod of the buffer cylinder passes through a piston rod through hole opened on the front top cross rod. The positioning unit includes a backing installed between the inner front side of a top longitudinal rod and the inner side of a middle longitudinal rod on the frame, and a positioning cylinder installed laterally between the inner front side of another top longitudinal rod and the inner front side of another middle longitudinal rod and opposite to the backing. The clamping unit is located at the engraving station of the machine frame and includes a fixed clamping wheel and a movable clamping wheel. The fixed clamping wheel spans between the front top surfaces of the two longitudinal rods of the machine frame and is located below the front of the two feed slides. The fixed clamping wheel is driven to rotate by a servo drive mechanism. The movable clamping wheel is mounted on a front lifting mechanism. The front lifting mechanism includes a pair of front linear guides vertically mounted on the inner front surface of the machine frame, a front lifting cylinder mounted between the pair of front linear guides, and a wheel frame mounted between the pair of front linear guides via a front slider and connected to the end of the piston rod of the front lifting cylinder. The movable clamping wheel is mounted on the wheel frame, so that the movable clamping wheel is located below the front of the fixed clamping wheel. The discharge unit includes a discharge track, a discharge blocking mechanism, and a discharge tray. The discharge track includes a front lower cross brace spanning the middle of two front lower straight rods of the frame and two discharge slides fixed between the front lower cross brace and the lower inner sides of two rear columns, with the front higher than the rear. The discharge blocking mechanism includes a hinge pin spanning the rear inner sides of the two discharge slides, a discharge stop rod hinged in the middle to the hinge pin, and a discharge blocking cylinder mounted between the bottom surfaces of the two discharge slides and hinged to the lower end of the discharge stop rod via a cylinder seat. The discharge tray is mounted on a rear lifting mechanism, which includes a pair of rear linear guides vertically mounted on the rear end face of the frame, a rear lifting cylinder mounted on one side of the pair of rear linear guides, and a slider mounted between the pair of rear linear guides and connected to the rear lifting cylinder. The discharge tray is mounted on the slider via a tray bracket. The sensing unit includes a feed sensor installed at the rear of any one of the top longitudinal rods of the frame, a tactile sensor installed on the buffer cylinder, a stacking sensor installed at the rear of any one of the middle longitudinal rods of the frame, and a discharge sensor installed on the bottom surface of the discharge tray. The signal input terminals of the controller are respectively connected to the feed sensor, tactile sensor, stacking sensor and discharge sensor, and the signal output terminals of the controller are respectively connected to the feed blocking cylinder, buffer cylinder, engraving machine, positioning cylinder, servo drive mechanism, front lifting cylinder, discharge blocking cylinder and rear lifting cylinder.

[0006] The aforementioned fully automatic continuous engraving device for bearing outer rings includes, in which the frame further includes two rear upper straight rods fixed one-to-one between the rear parts of the two middle longitudinal rods and the front and rear parts of the two top longitudinal rods; the feeding track further includes a middle upper cross brace straddling the lower parts of the two rear upper straight rods and supported on the bottom surface of the two feeding slides.

[0007] The aforementioned fully automatic continuous engraving device for bearing outer rings includes a ball screw mechanism inside the frame of the engraving unit, and an operating handwheel connected to the ball screw is located on the top of the frame; the CNC engraving machine is mounted on the ball nut via a sleeve.

[0008] The aforementioned fully automatic continuous engraving device for bearing outer rings further includes a second feed blocking cylinder that is horizontally mounted in a one-to-one correspondence with and opposite to the two top longitudinal rods of the frame.

[0009] In the aforementioned fully automatic continuous engraving device for the outer ring of a bearing, a rubber head is installed at the end of the piston rod of the buffer cylinder.

[0010] The aforementioned fully automatic continuous engraving device for the outer ring of a bearing, wherein the backing includes a backing bracket and two backing rollers vertically mounted on the inner side of the backing bracket.

[0011] The aforementioned fully automatic continuous engraving device for the outer ring of a bearing includes a servo drive mechanism comprising a servo motor mounted on the top surface of the front part of a central longitudinal rod of the frame and a synchronous belt drive mechanism connected between the rotating shaft of the servo motor and one end of the axle of the fixed wheel.

[0012] The fully automatic continuous engraving device for bearing outer rings of the present invention has the following characteristics: 1. Fully automated and intelligent: From feeding, precise positioning, engraving at multiple positions around the circumference to unloading, the entire process requires no manual intervention. It is coordinated and controlled by a PLC controller, which greatly reduces labor intensity and improves production consistency.

[0013] 2. Precise and reliable positioning and clamping: The bearing outer ring is stably clamped as soon as it reaches the engraving position by adopting a combination of "preparatory clamping + lateral positioning". Then, the positioning device is finely adjusted and locked to ensure that the engraving position is absolutely accurate and consistent.

[0014] 3. Continuous and stable process: The feeding blocking mechanism and the discharging blocking mechanism are detected and controlled together. With the front lifting mechanism of the clamping unit and the rear lifting mechanism of the discharging unit in a "normally open and ready" working mode, the problem of workpiece jamming and material accumulation is effectively avoided, ensuring the stability of high-speed continuous operation.

[0015] 4. Significantly improved efficiency: It supports continuous workpiece feeding, and the engraving station is always in a ready state. The clamping, rotating, engraving, and lowering actions are closely connected, the operation cycle time is short, and the production efficiency is high. It can realize the fully automated operation of bearing outer ring from feeding, positioning, engraving to unloading. The device has a compact structure and intelligent control, and is suitable for continuous engraving operations of bearing outer rings of various sizes. Attached Figure Description

[0016] Figure 1 This is a perspective view of the fully automatic continuous engraving device for bearing outer rings according to the present invention; Figure 2 This is a front view of the fully automatic continuous engraving device for bearing outer rings according to the present invention; Figure 3 yes Figure 2 AA direction view; Figure 4 This is a top view of the fully automatic continuous engraving device for bearing outer rings according to the present invention.

[0017] Figure 5 This is a perspective view of the frame in the engraving device of the present invention; Figure 5a This is a side view of the frame in the engraving device of the present invention; Figure 5b This is a top view of the frame in the engraving device of the present invention; Figure 6 This is an axial cross-sectional view of the buffer cylinder in the engraving device of the present invention; Figure 7 This is a front view of the positioning unit in the engraving device of the present invention; Figure 7a yes Figure 7 BB view in the middle; Figure 8 This is a side view of the clamping unit in the engraving device of the present invention; Figure 8a yes Figure 8 The left-hand view in the middle; Figure 8b yes Figure 8 Top view. Detailed Implementation

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Please see Figures 1 to 8b The fully automatic continuous engraving device for bearing outer ring of the present invention includes a frame 1, an engraving unit, a feeding unit, a positioning unit, a clamping unit, a discharging unit, a sensing unit, and a controller.

[0020] The frame 1 includes two front uprights 11a, two rear uprights 11b, a top frame fixed between the tops of the two front uprights 11a and the tops of the two rear uprights 11b and consisting of two top crossbars 12a and two top longitudinal bars 13a, a middle frame fixed between the middle parts of the two front uprights 11a and the middle parts of the two rear uprights 11b and consisting of two middle crossbars 12b and two middle longitudinal bars 13b, a lower crossbar 12c spanning the lower parts of the two front uprights 11a, and two bars fixed between the two... The lower longitudinal bar 13c between the lower part of the front column 11a and the lower part of the two rear columns 11b; two front upper straight bars 14 fixed one-to-one between the front part of the two middle longitudinal bars 13b and the front part of the two top longitudinal bars 13a; two rear upper straight bars 15 fixed one-to-one between the rear part of the two middle longitudinal bars 13b and the front and rear parts of the two top longitudinal bars 13a; and two front lower straight bars 16 fixed one-to-one between the front part of the two lower longitudinal bars 13a and the front part of the two middle longitudinal bars 13b.

[0021] The engraving unit includes a stand 2A and a CNC engraving machine 2B. The stand 2A is fixed to the front top surface of the two top longitudinal rods 13a of the frame 1. The stand 2A is equipped with a ball screw, and the top of the stand 2A is equipped with an operating handwheel 2 connected to the ball screw. The CNC engraving machine 2B is mounted on a ball nut through a sleeve, and the engraving needle 20 of the CNC engraving machine 2B is aligned with the engraving station in the frame 1.

[0022] The feeding unit includes a feeding track, a feeding blocking mechanism, and a buffer cylinder 35; wherein, The feeding track includes a front upper cross brace 31 spanning the middle of two front upper straight rods 14, a rear upper cross brace 32 spanning the upper part of two rear uprights 11b and higher than the front upper cross brace 31, a feeding slide plate 30 fixed between the top surface of the front upper cross brace 31 and the top surface of the rear upper cross brace 32, and a middle upper cross brace 33 spanning the lower part of two rear upper straight rods 15 and supported on the bottom surface of the two feeding slide plates 30; the angle between the feeding slide plate 30 and the horizontal plane is 20-30°; The feed blocking mechanism includes a first feed blocking cylinder 34a, which is installed laterally and oppositely in the middle of the two top longitudinal rods 13a of the frame 1, and a second feed blocking cylinder 34b, which is installed laterally and oppositely in front of the two top longitudinal rods 13a of the frame 1. The buffer cylinder 35 is longitudinally installed in the middle of a top crossbar 12a located at the front end of the frame 2. The piston rod of the buffer cylinder 35 passes through a piston rod through hole opened on the front top crossbar 12a. A rubber head 350 is installed at the end of the piston rod of the buffer cylinder 35.

[0023] The positioning unit includes a support 41 and a positioning cylinder 42; wherein, the support includes a support bracket 411 installed between the inner front side of a top longitudinal rod 13a and the inner side of a middle longitudinal rod 13b on the frame 1 and two support rollers 412 vertically installed on the inner side of the support bracket 411; the positioning cylinder 42 is installed laterally between the inner front side of another top longitudinal rod 13a and the inner front side of another middle longitudinal rod 13b and is opposite to the support 41.

[0024] The clamping unit is located at the engraving station of the frame 1 and includes a fixed clamping wheel 5A and a movable clamping wheel 5B. The fixed clamping wheel 5A spans between the front top surfaces of the two longitudinal rods 13b of the frame 1 and is located below the front of the two feed slides 30. The fixed clamping wheel 5A is driven to rotate by a servo drive mechanism. This servo drive mechanism includes a servo motor 50 mounted on the front top surface of one of the longitudinal rods 13b of the frame 1 and a servo motor 50 connected to one end of the axle of the fixed wheel 5A. A step belt drive mechanism 51; a movable clamping wheel 5B is mounted on a front lifting mechanism; the front lifting mechanism includes a pair of front linear guides 52 vertically mounted on the inner side of the front end of the frame 1, a front lifting cylinder 53 mounted between the pair of front linear guides 52, and a wheel frame 54 mounted between the pair of front linear guides 52 via a front slider and connected to the end of the piston rod of the front lifting cylinder 53; the movable clamping wheel 5B is mounted on the wheel frame 54, so that the movable clamping wheel 5B is located in front of and below the fixed clamping wheel 5A.

[0025] The discharge unit includes a discharge track, a discharge blocking mechanism, and a discharge plate 66; wherein, The discharge track includes a front lower cross brace 61 that spans the middle of the two front lower straight rods 16 of the frame 1 and two discharge slide plates 60 that are fixed between the front lower cross brace 61 and the lower inner side of the two rear columns 11b, with the front higher than the rear; the angle between the discharge slide plate 60 and the horizontal plane is also 20-30°. The discharge blocking mechanism includes a hinge pin 62 spanning the rear inner sides of two discharge slide plates 60, a discharge stop rod 63 hinged in the middle to the hinge pin 62, a cylinder seat 64 installed between the middle of the bottom surfaces of the two discharge slide plates 60, and a discharge blocking cylinder 65 installed on the cylinder seat 64 with the end of the piston rod hinged to the lower end of the discharge stop rod 63. The discharge tray 66 is mounted on the rear lifting mechanism, which includes a pair of rear linear guides 67 vertically mounted on the rear end face of the frame 1, a rear lifting cylinder 67 mounted on one side of the pair of rear linear guides 67, and a tray bracket 69 mounted between the pair of rear linear guides 67 via a rear slider and connected to the end of the piston rod of the rear lifting cylinder 68; the discharge tray 66 is mounted on the tray bracket 69.

[0026] The sensing unit includes a first feed sensor installed at the rear of any one of the top longitudinal rods 13a of the frame 1, a second feed sensor installed at the middle of any one of the top longitudinal rods 13a of the frame 1, a tactile sensor installed on the piston rod of the buffer cylinder 35, a stacking sensor installed at the rear of any one of the middle longitudinal rods 13b of the frame 1, and a discharge sensor installed on the bottom surface of the discharge plate 66.

[0027] The controller is a PLC variable programmable controller and is installed on the side of the frame 1. The signal input terminals of the controller are connected to the first feed sensor, the second feed sensor, the tactile sensor, the stacking sensor and the discharge sensor, respectively. The signal output terminals of the controller are connected to the CNC engraving machine 2B, the first feed blocking cylinder 34a, the second feed blocking cylinder 34b, the buffer cylinder 35, the positioning cylinder 42, the servo motor 50, the front lifting cylinder 52, the discharge blocking cylinder 65 and the rear lifting cylinder 68, respectively.

[0028] The fully automatic continuous engraving device for bearing outer rings of the present invention includes the following steps during use: 1. Feeding and loading: The workpiece 7 (bearing outer ring) is placed into the feed rail in a manner in which the axial direction is parallel to the transverse direction of the frame 1. The workpiece 7 slides down the inclined surface of the feed slide plate 30 automatically towards the engraving station by gravity.

[0029] 2. Positioning and Blocking: When workpiece 7 slides to the engraving station, it triggers the first feed sensor and the tactile sensor. The piston rods of a pair of first feed blocking cylinders 34a extend to block subsequent workpieces 7 from sliding down; and the piston rod of the buffer cylinder 35 retracts. When the engraving station is idle, the piston rods of the pair of first feed blocking cylinders 34a retract, and the piston rod of the buffer cylinder 35 extends to stop and receive a workpiece 7 sliding down to the engraving station. When there is a workpiece 7 undergoing engraving at the engraving station, the piston rods of the pair of first feed blocking cylinders 34a extend to block subsequent workpieces 7 from sliding towards the engraving station, and the piston rod of the buffer cylinder 35 retracts. When the first feed sensor malfunctions, the second feed sensor detects workpiece 7, causing the piston rods of a pair of second feed blocking cylinders 34b to extend, blocking subsequent workpieces 7 from entering the engraving station.

[0030] 3. Clamping and Precise Engraving: The movable clamping wheel 5B of the clamping unit is in a high-position ready state when waiting for the material. Once the workpiece 7 enters the engraving station, it is circumferentially clamped by the fixed clamping wheel 5A and the movable clamping wheel 5B. Then, the piston rod of the positioning cylinder 42 extends and abuts against the large stop edge of the workpiece 7, pushing the workpiece axially towards the backrest 41, so that the positioning cylinder 42 and the backrest 41 axially fix the workpiece. Then, the servo motor 50 starts, causing the fixed clamping wheel 5A to drive the workpiece to rotate indexing. The CNC engraving machine 2B engraves characters sequentially at each designated position in the ring area of ​​the workpiece.

[0031] 4. Lowering and unloading: After the CNC engraving machine 2B finishes engraving, the front lifting mechanism of the clamping unit drives the movable clamping wheel 5B to descend, so that the workpiece falls to the discharge track.

[0032] 5. Pallet Conveying: The workpiece in the discharge track slides automatically along the inclined surface of the discharge slide plate 60 to the discharge pallet 66 on the rear end face of the frame 1 by gravity. This triggers the discharge sensor inside the discharge pallet 66, causing the rear lifting mechanism to raise the discharge pallet 66 to the picking position. After the workpiece is picked up, the discharge pallet 66 is lowered and reset by the rear lifting mechanism. If there is a workpiece in the discharge pallet 66 or the discharge pallet 66 has not descended to the correct position, the piston rod of the discharge blocking cylinder 65 extends, causing the discharge stop bar 63 to block subsequent workpieces from sliding into the discharge pallet 66 along the discharge slide plate 60. Once the discharge pallet 66 has descended to the correct position or there is no workpiece in the discharge pallet 66, the piston rod of the discharge blocking cylinder 65 retracts, causing the discharge stop bar 63 to release subsequent workpieces to slide into the discharge pallet 66.

[0033] 6. When the stacking sensor detects that the number of workpieces in the discharge track has reached a certain amount, the controller controls the CNC engraving machine 2B to stop engraving.

[0034] The above embodiments are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the invention. Therefore, all equivalent technical solutions should also fall within the scope of the invention and should be defined by the claims.

Claims

1. A fully automatic continuous engraving device for bearing outer rings, comprising a frame, an engraving unit, a feeding unit, a positioning unit, a clamping unit, a discharging unit, a sensing unit, and a controller; characterized in that, The frame includes two front columns, two rear columns, a top frame fixed between the tops of the two front columns and the tops of the two rear columns and consisting of two top horizontal bars and two top vertical bars, a middle frame fixed between the middle parts of the two front columns and the middle parts of the two rear columns and consisting of two middle horizontal bars and two middle vertical bars, a lower horizontal bar spanning between the lower parts of the two front columns, two lower vertical bars fixed between the lower parts of the two front columns and the lower parts of the two rear columns, two front upper straight bars fixed one-to-one between the front parts of the two middle vertical bars and the front parts of the two top vertical bars, and two front lower straight bars fixed one-to-one between the front parts of the two lower vertical bars and the front parts of the two middle vertical bars. The engraving unit includes a stand and a CNC engraving machine; the stand is fixed between the front top surfaces of the two top longitudinal rods of the machine frame; the CNC engraving machine is mounted on the stand and can be moved up and down, with the engraving needle of the CNC engraving machine aligned with the engraving station inside the machine frame; The feeding unit includes a feeding track, a feeding blocking mechanism, and a buffer cylinder; the feeding track includes a front upper cross brace spanning the middle of two front upper straight rods, a rear upper cross brace spanning the upper part of two rear columns and higher than the front upper cross brace, and a feeding slide plate fixed between the top surface of the front upper cross brace and the top surface of the rear upper cross brace; the feeding blocking mechanism includes a first feeding blocking cylinder that is installed laterally in the middle of two top longitudinal rods of the frame in a one-to-one correspondence; the buffer cylinder is installed longitudinally in the middle of a top cross rod located at the front end of the frame, and the piston rod of the buffer cylinder passes through a piston rod through hole opened on the front top cross rod. The positioning unit includes a backing installed between the inner front side of a top longitudinal rod and the inner side of a middle longitudinal rod on the frame, and a positioning cylinder installed laterally between the inner front side of another top longitudinal rod and the inner front side of another middle longitudinal rod and opposite to the backing. The clamping unit is located at the engraving station of the machine frame and includes a fixed clamping wheel and a movable clamping wheel. The fixed clamping wheel spans between the front top surfaces of the two longitudinal rods of the machine frame and is located below the front of the two feed slides. The fixed clamping wheel is driven to rotate by a servo drive mechanism. The movable clamping wheel is mounted on a front lifting mechanism. The front lifting mechanism includes a pair of front linear guides vertically mounted on the inner front surface of the machine frame, a front lifting cylinder mounted between the pair of front linear guides, and a wheel frame mounted between the pair of front linear guides via a front slider and connected to the end of the piston rod of the front lifting cylinder. The movable clamping wheel is mounted on the wheel frame, so that the movable clamping wheel is located below the front of the fixed clamping wheel. The discharge unit includes a discharge track, a discharge blocking mechanism, and a discharge tray. The discharge track includes a front lower cross brace spanning the middle of two front lower straight rods of the frame and two discharge slides fixed between the front lower cross brace and the lower inner sides of two rear columns, with the front higher than the rear. The discharge blocking mechanism includes a hinge pin spanning the rear inner sides of the two discharge slides, a discharge stop rod hinged in the middle to the hinge pin, and a discharge blocking cylinder mounted between the bottom surfaces of the two discharge slides and hinged to the lower end of the discharge stop rod via a cylinder seat. The discharge tray is mounted on a rear lifting mechanism, which includes a pair of rear linear guides vertically mounted on the rear end face of the frame, a rear lifting cylinder mounted on one side of the pair of rear linear guides, and a slider mounted between the pair of rear linear guides and connected to the rear lifting cylinder. The discharge tray is mounted on the slider via a tray bracket. The sensing unit includes a feed sensor installed at the rear of any one of the top longitudinal rods of the frame, a tactile sensor installed on the buffer cylinder, a stacking sensor installed at the rear of any one of the middle longitudinal rods of the frame, and a discharge sensor installed on the bottom surface of the discharge tray. The signal input terminals of the controller are respectively connected to the feed sensor, tactile sensor, stacking sensor and discharge sensor, and the signal output terminals of the controller are respectively connected to the feed blocking cylinder, buffer cylinder, engraving machine, positioning cylinder, servo drive mechanism, front lifting cylinder, discharge blocking cylinder and rear lifting cylinder.

2. The fully automatic continuous engraving device for bearing outer rings according to claim 1, characterized in that, The frame also includes two rear upper straight rods that are fixed one-to-one between the rear parts of the two middle longitudinal rods and the front and rear parts of the two top longitudinal rods; the feed rail also includes a middle upper cross brace that spans between the lower parts of the two rear upper straight rods and is supported on the bottom surface of the two feed slide plates.

3. The fully automatic continuous engraving device for bearing outer rings according to claim 1, characterized in that, The lettering unit has a ball screw mechanism inside its frame, and an operating handwheel connected to the ball screw is located on the top of the frame; the CNC lettering machine is mounted on the ball nut via a sleeve.

4. The fully automatic continuous engraving device for bearing outer rings according to claim 1, characterized in that, The feed blocking mechanism also includes a second feed blocking cylinder that is horizontally mounted in a one-to-one correspondence with and opposite to the two top longitudinal rods of the frame.

5. The fully automatic continuous engraving device for bearing outer rings according to claim 1, characterized in that, A rubber head is installed at the end of the piston rod of the buffer cylinder.

6. The fully automatic continuous engraving device for bearing outer rings according to claim 1, characterized in that, The backing includes a backing bracket and two backing rollers that are vertically installed on the inner side of the backing bracket.

7. The fully automatic continuous engraving device for bearing outer rings according to claim 1, characterized in that, The servo drive mechanism includes a servo motor mounted on the top surface of the front part of a central longitudinal rod of the frame and a synchronous belt drive mechanism connected between the rotating shaft of the servo motor and one end of the axle of the fixed wheel.

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