Visual mistake proofing device for bearing bush assembly

Abstract

The invention provides a visual mistake proofing device for bearing bush assembly, and relates to the technical field of engine bearing bush assembly mistake proofing, the visual mistake proofing device comprises a marking pipe and a plurality of marking seats, a plurality of positioning notches are machined in one side of the marking pipe, a plurality of mounting notches are machined in the other side of the marking pipe, each marking seat comprises a mounting ring, and a disc is integrally formed on the inner wall of each mounting ring; an erecting lantern ring is integrally formed in the center of each of the two sides of the disc, a marking column is rotationally connected to the interior of each erecting lantern ring, and two marking heads are connected to the interior of one end of each marking column in an embedded mode; the technical key points are as follows: a plurality of marking seats which are coaxially arranged inside are mounted inside a marking pipe, and a plurality of positioning notches in the marking pipe are used for buckling the positioning notches outside a plurality of tile seats, so that when two marking columns on the two sides of the mounting notches are controlled, the positioning notches are buckled outside the tile seats; and after the red or blue marking head on the marking column faces the opening of the mounting notch to carry out journal marking, the bearing bush is convenient to assemble, and a worker does not need to memorize the bearing bush.

Description

Technical Field

[0001] The invention relates to the technical field of error prevention for engine bearing assembly, in particular to a visual error prevention device for bearing assembly. Background Art

[0002] The engine bearing is the part where the sliding bearing and the journal contact. It is a semi-cylindrical surface in the shape of a tile, very smooth, and is generally made of wear-resistant materials such as bronze and anti-friction alloys. In special cases, it can be made of wood, engineering plastics or rubber. There are two types of bearings: integral and split. The integral bearing is usually called a sleeve. The integral bearing has two types: without oil groove and with oil groove. The bearing and the journal adopt a clearance fit and generally do not rotate with the shaft.

[0003] The crankshaft journal diameter requirements are very strict. Usually after the crankshaft is processed, the actual size of the journal is measured and grouped into red and blue. Generally, the size below the tolerance is in the blue group, and the size above the tolerance is in the red group. They are marked next to the corresponding journal with red and blue paint pens respectively.

[0004] During engine assembly, it is necessary to observe the color of the crankshaft journal and select the corresponding color of the bearing for assembly. The blue group of journals with a lower diameter difference need to be installed with thicker blue bearings, and the red group of journals with an upper diameter difference need to be installed with thinner red bearings to ensure that the gap between the bearing and the crankshaft is within the appropriate range to ensure product quality. If the wrong bearing is installed, the thin bearing will be installed on the journal with a lower diameter difference, resulting in too large a gap, which will cause engine abnormalities, low oil pressure and other faults; conversely, the thick bearing will be installed on the journal with an upper diameter difference, resulting in too small a gap, resulting in increased friction of the internal combustion engine, poor output performance, and even crankshaft locking and other serious faults.

[0005] The existing bearing assembly work is mainly done by workers observing the color markings on the crankshaft journals, and then the workers rely on their brains to remember the journal information of a certain color, and then take the bearing to install it on the corresponding journal. However, in the actual operation process, it is difficult for the workers to install the bearing with the correct crankshaft grouping information during the subsequent operation due to the easy occurrence of memory fuzziness, memory errors and memory forgetting.

[0006] In order to reduce the risk of incorrect bearing installation to a certain extent, under the premise of continuous technological development, a QR code of the crankshaft will be scanned in advance to transmit the grouping information of the crankshaft journal to the computer screen of the bearing assembly position. Employees have to look up at the screen while installing the bearing, but it is still easy to misread the gear position, and frequently looking up at the screen affects work efficiency. Summary of the invention

[0007] In order to overcome the shortcomings of the prior art, an embodiment of the present application provides a visual error-proofing device for bearing assembly, which achieves the effect of marking a bearing of target thickness and then assembling it without the need for staff to memorize the marking.

[0008] The technical solution adopted by the embodiment of the present application to solve the technical problem is:

[0009] A visual error-proofing device for bearing assembly, comprising a marking tube and a marking seat, wherein the marking tube is applied to an engine cylinder block;

[0010] There are multiple marking seats, all of which are coaxially arranged inside the marking tube;

[0011] One side of the marking tube is processed with a plurality of positioning notches, and the other side of the marking tube is processed with a plurality of mounting notches. The marking seat includes a mounting ring, and the inner wall of the mounting ring is integrally formed with a disc, and the centers of both sides of the disc are integrally formed with mounting rings, and the mounting rings are rotatably connected to the inside of the marking rings, and one end of the marking column is internally embedded and connected with two marking heads;

[0012] Among them, the multiple positioning slots and the multiple installation slots correspond one to one and are symmetrically arranged on both sides of the axial section of the marking tube. The interior of the engine cylinder block is provided with a plurality of shoe seats for supporting the installation of bearings. The marking tube is buckled to the outside of the plurality of shoe seats through the multiple positioning slots, and the bearings are connected to the shoe seats through the interior of the marking tube at the installation slots; the two marking heads at one end of the marking column are marked red and blue respectively, and the marking columns on both sides of a disc extend into the interior of two adjacent installation slots respectively.

[0013] In a possible implementation, a limiting ring groove is processed on the surface of one end of the marking column, and the top of the mounting ring is threadedly connected to a limiting screw; one end of the limiting screw is a round rod, which extends into the interior of the limiting ring groove to limit the movement of the marking column along the axial direction inside the mounting ring.

[0014] In a possible implementation, two metal blocks are pinned internally at one end of the marker column, and a magnet is pinned at the bottom of the mounting ring; the two metal blocks are symmetrically arranged at the top and bottom of the axis of the marker column, and the magnet and the metal blocks are attracted to each other.

[0015] In one possible implementation, the outside of the mounting ring is assembled and connected to a ring seat, and retaining rings are provided on both sides of the ring seat. A plurality of positioning ring grooves are processed on the inner wall of the marking tube; the plurality of positioning ring grooves are used in combination of two, and the two positioning ring grooves used in combination are located between two adjacent mounting notches, and the retaining ring is clamped to the inside of the positioning ring groove to fix the marking seat between the two retaining rings.

[0016] In one possible implementation, a control structure is provided on the outside of the marking tube, which controls the marking tube to be placed on one side of the engine cylinder block, and drives multiple marking seats to perform marking work on multiple bearing seats before the installation of bearings; the control structure controls the marking tube to be placed on one side of the engine cylinder block in three ways: two-axis control, three-axis control and rotation control.

[0017] In one possible implementation, the control structure working in a two-axis control mode may include two end frames, one end of the two end frames is provided with the same connecting base plate, and the bottom surfaces at both ends of the connecting base plate are assembled and connected with hydraulic push rods B; the other ends of the two end frames are respectively assembled and fixed to the two ends of the marking tube, and one end of the hydraulic push rod B passes through the interior of the connecting base plate and is assembled and fixed to the end frames.

[0018] In a possible implementation, the surfaces of one end of the two end frames are processed with multiple guide sleeves facing the other end, and the top surfaces of the two ends of the connecting base plate are processed with multiple guide rods A; the hydraulic push rod B controls the up and down movement of the two end frames, so that the multiple guide sleeves on the end frames slide outside the multiple guide rods A respectively.

[0019] In one possible implementation, a mounting base plate is provided at the bottom of the connecting base plate, and the tops of both ends of the mounting base plate are assembled and connected with two angle plates A, and the bottoms of both ends of the connecting base plate are assembled and connected with angle plates B. A hydraulic push rod A is assembled and connected to the surface of an angle plate A at one end of the mounting base plate, and a guide rod B is assembled and connected to the surface of one end of the angle plate B; one end of the hydraulic push rod A passes through the interior of one angle plate A and is assembled and fixed to the surface of the other end of the angle plate B, and the guide rod B is slidably connected to the interior of the other angle plate A.

[0020] In a possible implementation, the mounting base plate is composed of a U-shaped plate in the center and straight plates at both ends. The two straight plates are integrally formed to the two ends of the U-shaped plate. The connecting base plate covers the top of the mounting base plate, and when the marking tube moves toward one side of the engine cylinder block, the U-shaped plate opening on the mounting base plate is exposed.

[0021] In a possible implementation, the inner diameter of the marking tube is larger than the outer diameter of the bearing bush installed on the bush seat, and the horizontal projection surface shapes of the plurality of mounting notches are all isosceles trapezoids.

[0022] The beneficial effects of this application are:

[0023] First, in this scheme, by installing multiple coaxially arranged marking seats inside the marking tube, and using multiple positioning notches on the marking tube to buckle the positioning notches on the outside of multiple bearing seats, based on the shaft neck with the upper and lower diameter deviations obtained by the PLC system in the previous process, the two marking posts on both sides of the installation notch are controlled to rotate using the PLC system data, so that the red marking head on the marking post faces the opening of the installation notch, and the blue marking head is also used in this way, so that it is convenient to mark the bearing of the target thickness and then assemble the bearing without the need for workers to remember;

[0024] Second, in this scheme, two coaxial metal blocks symmetrical about the axis of the marking column are embedded inside one end of the marking column, and a magnet pinned to the inside of the mounting ring and any one of the metal blocks can be used to make a marking head on the marking column stably face the opening of the installation slot, which is conducive to color marking work, thereby providing a stable reference for the staff to install the bearing bush through the inside of the marking tube at the installation slot to the bush seat;

[0025] Third, in this scheme, by utilizing the hydraulic push rod A located at the top of the erection base plate to control the angle plate B installed at the bottom of the connecting base plate to move away from the hydraulic push rod A, and utilizing the hydraulic push rod B installed at the bottom of the connecting base plate to control the end frame to move toward the top, the marking tube between one end of the two end frames can be moved up first, and then pushed to one side of the engine cylinder block, so that the marking tube is connected to the engine cylinder block to support the effect of subsequently marking the tile seat on the engine cylinder block through the marking head on the marking column, and the stability is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of a visual error-proofing device for bearing assembly of the present invention in a use state;

[0027] Figure 2 A cross-sectional schematic diagram of a marking tube of a visual error-proofing device for assembling a bearing bush according to the present invention;

[0028] Figure 3 A schematic diagram of the structure of a visual error-proofing device for bearing assembly according to the present invention;

[0029] Figure 4 It is a visual error-proofing device for bearing assembly of the present invention and an enlarged schematic diagram of part A in 2;

[0030] Figure 5 A cross-sectional schematic diagram of a visual error-proofing device marking seat for assembling a bearing bush according to the present invention;

[0031] Figure 6A schematic diagram of the structure of a marking column of a visual error-proofing device for assembling a bearing bush according to the present invention;

[0032] Figure 7 An exploded schematic diagram of a visual error-proofing device marking seat for assembling a bearing bush according to the present invention;

[0033] Figure 8 A top view of a marking tube of a visual error-proofing device for assembling a bearing bush according to the present invention;

[0034] Fig. 9 It is a partial structural schematic diagram of a visual error-proofing device control structure for bearing assembly of the present invention;

[0035] Fig.10 This is a schematic diagram of the connection structure of an engine cylinder block and a marking tube of a visual error-proofing device for bearing assembly according to the present invention.

[0036] Figure numerals: 1. engine block; 2. marking tube; 3. mounting notch; 4. positioning notch; 5. guide rod A; 6. mounting base plate; 7. connecting base plate; 8. hydraulic push rod A; 9. angle plate A; 10. guide sleeve; 11. end frame; 12. tile seat; 13. marking seat; 131. mounting ring; 132. disc; 133. mounting sleeve ring; 134. ring seat; 14. guide rod B; 15. hydraulic push rod B; 16. angle plate B; 17. positioning ring groove; 18. retaining ring; 19. marking head; 20. marking column; 21. limit screw; 22. magnet; 23. limit ring groove; 24. metal block. DETAILED DESCRIPTION

[0037] The technical solution in the embodiment of the present application is to solve the problems of the above-mentioned background technology, and the overall idea is as follows:

[0038] Embodiment 1:

[0039] This embodiment introduces a specific structure of a visual error-proofing device for bearing assembly. Figures 1 to 8 , Fig.10 As shown, it includes a marking tube 2 applied to an engine cylinder block 1 and a plurality of marking seats 13 coaxially arranged inside the marking tube 2, a plurality of positioning notches 4 are processed on one side of the marking tube 2, a plurality of mounting notches 3 are processed on the other side of the marking tube 2, the marking seat 13 includes a mounting ring 131, a disc 132 is integrally formed on the inner wall of the mounting ring 131, a mounting ring 133 is integrally formed at the center of both sides of the disc 132, a marking column 20 is rotatably connected inside the mounting ring 133, and two marking heads 19 are internally embedded and connected at one end of the marking column 20;

[0040] Among them, by making the multiple positioning notches 4 and the multiple installation notches 3 correspond one to one, and symmetrically arranged on both sides of the axial section of the marking tube 2, when the target bearing is installed to the multiple shoe seats 12 inside the engine cylinder block 1, the marking tube 2 can be buckled to the outside of the multiple shoe seats 12 through the multiple positioning notches 4, and the bearing passes through the inside of the marking tube 2 and the shoe seat 12 through the installation notch 3. During this process, the bearing will not fall into the inside of the engine cylinder block 1, which is conducive to the corresponding assembly work;

[0041] At the same time, by marking the two marking heads 19 at one end of the marking column 20 with red and blue respectively (in order to simulate the conventional manual installation method, two different colors of red and blue are used to mark the journals with the upper and lower diameter deviations at the bearing installation position, based on the journals with the upper and lower diameter deviations obtained by the PLC system in the previous process), when the marking columns 20 on both sides of a disk 132 are respectively extended into the insides of two adjacent installation slots 3, the marking column 20 can be rotated inside the mounting ring 133 so that the marking heads 19 of the corresponding colors on the marking column 20 face the openings of the installation slots 3, providing instructions for the operator and preventing the marking from being lost;

[0042] In addition, by making the inner diameter of the marking tube 2 larger than the outer diameter of the bearing installed on the bearing seat 12, and the horizontal projection surface shapes of the plurality of mounting notches 3 are all isosceles trapezoids, interference can be avoided when the bearing is installed on the bearing seat 12, and when the marking tube 2 is removed from one side of the engine cylinder block 1, the bearing that has been installed will not be taken away;

[0043] Secondly, in order to prevent one end of the marker column 20 from being separated from the interior of the mounting ring 133, as shown in FIG. Figure 4 and Figure 5 As shown, a limit ring groove 23 is processed on the surface of one end of the marker column 20, and a limit screw 21 (one end of which is a round rod) is threadedly connected to the top of the mounting ring 133. By making the round rod part on the limit screw 21 extend into the inside of the limit ring groove 23, the marker column 20 can be limited to move along the axial direction inside the mounting ring 133, so as to stably store the marker column 20 inside the mounting ring 133 without affecting the rotation of the marker column 20 inside the mounting ring 133;

[0044] Furthermore, in order to ensure that the marking head 19 with color indication at one end of the marking column 20 can stably face the opening of the installation slot 3, as shown in FIG. Figure 5As shown, two metal blocks 24 are pinned at one end of the marking column 20, and a magnet 22 is pinned at the bottom of the mounting ring 133. By symmetrically arranging the two metal blocks 24 at the top and bottom of the axis of the marking column 20, when the magnet 22 and the metal block 24 are attracted to each other, any one of the marking heads 19 can face the opening of the mounting slot 3, which is conducive to controlling the rotation of the marking column 20 to switch the blue or red marking head 19 to face the opening of the mounting slot 3.

[0045] Furthermore, in order to fix the entire marking seat 13 inside the marking tube 2, the two marking posts 20 at both ends of the marking seat 13 are extended to the inside of the two mounting slots 3 respectively, as shown in FIG. Figure 4 As shown, the outside of the mounting ring 131 is assembled and connected with a ring seat 134, and snap rings 18 are provided on both sides of the ring seat 134. A plurality of positioning ring grooves 17 are processed on the inner wall of the marking tube 2. By combining the plurality of positioning ring grooves 17 in pairs and making the two positioning ring grooves 17 in combination be located between two adjacent mounting notches 3, when the snap ring 18 is snapped into the inside of the positioning ring groove 17, the marking seat 13 can be fixed between the two snap rings 18.

[0046] The above design installs a plurality of coaxially arranged marking seats 13 inside the marking tube 2 (limited by two clamping rings 18 clamped into the two positioning ring grooves 17 in the combined use state), and uses a plurality of positioning notches 4 on the marking tube 2 to make the positioning notches 4 buckle onto the outside of a plurality of bearing seats 12. Based on the shaft necks with upward and downward diameter deviations obtained by the PLC system in the previous process, the two marking posts on both sides of the installation notch are controlled to rotate using the PLC system data so that the red marking head on the marking post faces the opening of the installation notch (the shaft necks with downward diameter deviations are marked at the corresponding positions using the blue marking head 19 on the marking post 20), and the bearing shells of the target thickness are marked accordingly.

[0047] At the same time, because two coaxial metal blocks 24 are embedded inside one end of the marking column 20 and are symmetrical about the axis of the marking column 20, a marking head 19 on the marking column 20 can be stably faced to the opening of the mounting slot 3 by pinning the magnet 22 and any one of the metal blocks 24 to the mounting ring 133, which is conducive to color marking work, thereby providing a stable reference for the staff to install the bearing in the mounting slot 3 through the inside of the marking tube 2 to the bearing seat 12 without the need for the staff to remember.

[0048] Embodiment 2:

[0049] Based on Example 1, this example introduces the specific structure of the marking tube 2, such as Figures 1 to 3 , Fig. 9As shown, a control structure is provided on the outside of the marking tube 2, and the control structure controls the marking tube 2 to be placed on one side of the engine cylinder block 1, and drives a plurality of marking seats 13 to perform marking work on a plurality of bearing seats 12 before the bearing is installed;

[0050] Among them, the control structure controls the marking tube 2 to be placed on one side of the engine cylinder block 1 in three ways: two-axis control, three-axis control and rotation control, so as to meet the operation requirements when the bearing is installed inside the bearing seat 12 on the engine cylinder block 1 (mainly to provide sufficient operation space) and ensure that the marking tube 2 is stably placed on one side of the marking tube 2;

[0051] like Figures 1 to 3 As shown, the control structure working in a two-axis control mode may include two end frames 11, one end of the two end frames 11 is provided with a same connecting bottom plate 7, and the bottom surfaces of both ends of the connecting bottom plate 7 are assembled and connected with hydraulic push rods B15;

[0052] like Fig. 9 As shown, a mounting base plate 6 is provided at the bottom of the connecting base plate 7, two angle plates A9 are assembled and connected at the tops of both ends of the mounting base plate 6, angle plates B16 are assembled and connected at the bottoms of both ends of the connecting base plate 7, a hydraulic push rod A8 is assembled and connected on the surface of an angle plate A9 at one end of the mounting base plate 6, and a guide rod B14 is assembled and connected on the surface of one end of the angle plate B16;

[0053] Among them, by assembling and fixing the other ends of the two end frames 11 to the two ends of the marking tube 2 respectively, when one end of the hydraulic push rod B15 passes through the inside of the connecting bottom plate 7 and is assembled and fixed to the end frame 11, the marking tube 2 can be mounted between the two end frames 11;

[0054] At the same time, in order to improve the stability of the hydraulic push rod B15 controlling the up and down movement of the marking tube 2 through the end frame 11, as shown in FIG. Figure 2 and Figure 3 As shown, the surfaces of one end of the two end frames 11 are processed with a plurality of guide sleeves 10 facing the other end, and the top surfaces of the two ends of the connecting bottom plate 7 are processed with a plurality of guide rods A5. In the process of using the hydraulic push rod B15 to control the up and down movement of the two end frames 11, the plurality of guide sleeves 10 on the end frames 11 can be respectively slid outside the plurality of guide rods A5 to improve the stability of the up and down movement of the end frames 11;

[0055] Secondly, by passing one end of the hydraulic push rod A8 through the interior of one angle plate A9 and assembling and fixing it with one end surface of the angle plate B16, when the hydraulic push rod A8 controls the angle plate B16 and one angle plate A9 to move closer to and away from each other, the guide rod B14 can be slidably connected to the interior of the other angle plate A9, so as to ensure the structural stability between the erection base plate 6 and the connection base plate 7;

[0056] Furthermore, in order to facilitate the staff to install the bearing bush to the bush seat 12 on the engine cylinder block 1 on the basis of this embodiment, as shown in FIG. Figure 3 and Fig. 9 As shown, the mounting base plate 6 is composed of a U-shaped plate at the center and straight plates at both ends. The two straight plates are integrally formed at the two ends of the U-shaped plate. When the marking tube 2 is not docked with the engine cylinder body 1, the connecting base plate 7 covers the top of the mounting base plate 6, and when the marking tube 2 moves toward the side of the engine cylinder body 1, the opening of the U-shaped plate on the mounting base plate 6 is exposed, which is convenient for the staff to perform corresponding installation work at the opening with reference to the marking heads 19 on the multiple marking columns 20 inside the marking tube 2.

[0057] The above-mentioned design uses the hydraulic push rod A8 located at the top of the mounting base plate 6 to control the angle plate B16 installed at the bottom of the connecting base plate 7 to move away from the hydraulic push rod A8 (in this process, the guide rod B14 installed on the angle plate B16 slides inside the angle plate A9 installed on the top of the mounting base plate 6), and uses the hydraulic push rod B15 installed on the bottom of the connecting base plate 7 to control the end frame 11 to move toward the top (in this process, the guide sleeve 10 processed on the end frame 11 slides outside the guide rod A5 processed on the top of the connecting base plate 7). This can make the marking tube 2 between one end of the two end frames 11 move up first, and then be pushed to one side of the engine cylinder block 1, so that the marking tube 2 is connected to the engine cylinder block 1, so as to support the subsequent effect of marking the tile seat 12 on the engine cylinder block 1 through the marking head 19 on the marking column 20.

[0058] It is worth noting that this embodiment adopts a two-axis control method to dock the engine cylinder 1 and the marking tube 2. On this basis, a third axis structure (including but not limited to a mechanical arm and a three-axis robot) can be added;

[0059] At the same time, a flip assembly can be used to flip the entire control structure by ninety degrees or one hundred and eighty degrees to dock the engine block 1 and the marking tube 2, thereby finally realizing the function of temporarily fixing the marking tube 2 to one side of the engine block 1 as in this embodiment.

[0060] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A visual error-proofing device for bearing assembly, characterized in that: include: A marking tube (2) applied to an engine cylinder block (1); A plurality of marking seats (13) are provided and are coaxially arranged inside the marking tube (2); One side of the marking tube (2) is processed with a plurality of positioning notches (4), and the other side of the marking tube (2) is processed with a plurality of mounting notches (3); the marking seat (13) comprises a mounting ring (131); the inner wall of the mounting ring (131) is integrally formed with a disk (132); the centers of both sides of the disk (132) are integrally formed with mounting rings (133); the mounting ring (133) is rotatably connected to a marking column (20); and one end of the marking column (20) is internally embedded with two marking heads (19); The plurality of positioning notches (4) and the plurality of mounting notches (3) correspond to each other one by one and are symmetrically arranged on both sides of the axial section of the marking tube (2); the interior of the engine cylinder block (1) is provided with a plurality of bearing seats (12) for supporting the installation of bearing bushes; the marking tube (2) is buckled to the outside of the plurality of bearing seats (12) through the plurality of positioning notches (4); and the bearing bushes pass through the interior of the marking tube (2) at the mounting notches (3) and are connected to the bearing seats (12); Two marking heads (19) at one end of the marking column (20) are marked in red and blue respectively, and the marking columns (20) on both sides of one of the disks (132) extend into two adjacent installation slots (3) respectively.

2. A visual error-proofing device for bearing assembly as claimed in claim 1, characterized in that: A limit ring groove (23) is processed on the surface of one end of the marking column (20), and a limit screw (21) is threadedly connected to the top of the mounting ring (133); One end of the limit screw (21) is a round rod, which extends into the interior of the limit ring groove (23) to limit the movement of the marking column (20) along the axial direction inside the mounting ring (133).

3. A visual error-proofing device for bearing assembly according to claim 1, characterized in that: Two metal blocks (24) are pinned inside one end of the marking column (20), and a magnet (22) is pinned at the bottom of the mounting ring (133); The two metal blocks (24) are symmetrically arranged at the top and bottom of the axis of the marking column (20), and the magnet (22) and the metal blocks (24) are attracted to each other.

4. A visual error-proofing device for bearing assembly as claimed in claim 1, characterized in that: The outside of the mounting ring (131) is assembled and connected with a ring seat (134), and both sides of the ring seat (134) are provided with a clamping ring (18), and the inner wall of the marking tube (2) is processed with a plurality of positioning ring grooves (17); The plurality of positioning ring grooves (17) are used in combination of two, and the two positioning ring grooves (17) used in combination are located between two adjacent mounting notches (3), and the snap ring (18) is snapped into the interior of the positioning ring groove (17), so that the marking seat (13) is fixed between the two snap rings (18).

5. A visual error-proofing device for bearing assembly as claimed in claim 1, characterized in that: A control structure is arranged outside the marking tube (2), and the control structure controls the marking tube (2) to be placed on one side of the engine cylinder block (1), and drives a plurality of marking seats (13) to perform marking work on a plurality of bearing seats (12) before the bearing is installed; The control structure can control the marking tube (2) to be placed on one side of the engine cylinder (1) in three ways: two-axis control, three-axis control and rotation control.

6. A visual error-proofing device for bearing assembly as claimed in claim 5, characterized in that: The control structure working in a two-axis control mode may include two end frames (11), one end of the two end frames (11) is provided with a same connecting base plate (7), and the bottom surfaces of both ends of the connecting base plate (7) are assembled and connected with hydraulic push rods B (15); The other ends of the two end frames (11) are respectively assembled and fixed to the two ends of the marking tube (2), and one end of the hydraulic push rod B (15) passes through the interior of the connecting base plate (7) and is assembled and fixed to the end frame (11).

7. A visual error-proofing device for bearing assembly as claimed in claim 6, characterized in that: The surfaces of one end of the two end frames (11) are processed with a plurality of guide sleeves (10) facing the other end, and the top surfaces of both ends of the connecting bottom plate (7) are processed with a plurality of guide rods A (5); The hydraulic push rod B (15) controls the two end frames (11) to move up and down, so that the multiple guide sleeves (10) on the end frames (11) slide outside the multiple guide rods A (5) respectively.

8. A visual error-proofing device for bearing assembly as claimed in claim 6, characterized in that: A mounting base plate (6) is arranged at the bottom of the connecting base plate (7), two angle plates A (9) are assembled and connected at the top of both ends of the mounting base plate (6), angle plates B (16) are assembled and connected at the bottom of both ends of the connecting base plate (7), a hydraulic push rod A (8) is assembled and connected on the surface of an angle plate A (9) located at one end of the mounting base plate (6), and a guide rod B (14) is assembled and connected on the surface of one end of the angle plate B (16); One end of the hydraulic push rod A (8) passes through the interior of an angle plate A (9) and is assembled and fixed to the other end surface of the angle plate B (16), and the guide rod B (14) is slidably connected to the interior of another angle plate A (9).

9. A visual error-proofing device for bearing assembly as claimed in claim 8, characterized in that: The mounting base plate (6) is composed of a U-shaped plate at the center and straight plates at both ends, and the two straight plates are integrally formed at the two ends of the U-shaped plate. The connecting base plate (7) covers the top of the mounting base plate (6) and exposes the U-shaped plate opening on the mounting base plate (6) when the marking tube (2) moves toward one side of the engine cylinder body (1).

10. A visual error-proofing device for bearing assembly as claimed in claim 1, characterized in that: The inner diameter of the marking tube (2) is larger than the outer diameter of the bearing bush mounted on the bush seat (12), and the horizontal projection surface shapes of the plurality of mounting notches (3) are all isosceles trapezoids.

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