Three-row roller slewing bearing, detection device, detection method and assembly method

Abstract

The invention discloses a slewing bearing with three rows of rollers, a detection device, a detection method and an assembly method.The slewing bearing comprises an outer upper ring, an outer lower ring and an inner ring, and multiple sets of axial long holes are formed in the inner ring; limiting components and connecting long pins are installed in the axial long holes respectively, and the limiting components and the connecting long pins in the multiple sets of axial long holes are arranged at intervals. Two groups of parallel radial holes are formed in the inner side of the inner ring, one ends of the two groups of radial holes are communicated with the axial long hole, and the other ends of the two groups of radial holes are respectively communicated with the upper retainer or the lower retainer; the limiting component comprises a positioning long bolt, and symmetrical conical sleeves are mounted on the positioning long bolt; the two groups of radial holes are arranged in parallel up and down and are respectively provided with an upper propping column and a lower propping column; the conical sleeve abuts against the upper abutting column and the lower abutting column. According to the slewing bearing with the three rows of rollers, the conical sleeves which are arranged in the circumferential direction abut against the corresponding upper abutting columns and the corresponding lower abutting columns respectively, and abut against the upper retainer or the lower retainer, so that the slewing bearing has better radial stability.

Description

Technical Field

[0001] This invention relates to the field of slewing bearings, and more specifically to a three-row roller slewing bearing, a testing device, a testing method, and an assembly method. Background Technology

[0002] Three-row roller slewing bearings are a type of slewing bearing, typically featuring three raceways, with separate upper, lower, and radial raceways, allowing for precise determination of the load on each row of rollers. The rollers include upper, middle, and lower rollers; the upper and lower rollers rotate laterally, coaxial with the inner raceway; the middle roller rotates vertically, radially around its axis. Three-row roller slewing bearings can simultaneously withstand various loads and are particularly suitable for heavy machinery requiring large diameters.

[0003] Radial clearance refers to the maximum relative displacement between the inner and outer rings of a slewing bearing in the radial direction when subjected to radial loads or in a free state. Simply put, it's the degree of "looseness" between the inner and outer rings in the direction perpendicular to the axis. This is mainly caused by radial allowance during the installation of the central rollers, resulting in radial wobble. Mounting surface runout refers to the flat surface of the slewing bearing, not the inner side. For slewing bearing production, both mounting surface and tooth surface runout need to be inspected.

[0004] Existing references, for example: CN202010685070.0 A slewing bearing clearance measuring device, which employs an outer ring fixed by a file on one side, and an inner ring inside which an electric push rod presses against the inner side of the inner ring relative to the outer ring, and the clearance change is detected by a vernier caliper to detect the clearance.

[0005] CN202021022562.3 A slewing bearing gear tooth surface runout testing device, which observes the runout by detecting the gear and the gear under test installed on the output end of the motor; the runout measuring instrument can move laterally because the screw can move laterally, and the top of the instrument moves upward to detect the end face of the gear under test, thereby realizing end face runout detection.

[0006] The existing technology still has the following problems: First, the inspection of radial clearance and mounting surface often involves multiple devices, making integrated inspection impossible. Second, currently, companies reduce the likelihood of radial clearance issues by designing rollers and outer rings with sufficient margin. After the initial complete installation, clearance is inspected. If the radial clearance exceeds the limit, disassembly, surface grinding, or material replacement is required before reinstallation. Therefore, frequent rework is necessary when clearance exceeds the limit, which is detrimental to production cycle time. Summary of the Invention

[0007] The purpose of this invention is to provide a three-row roller slewing bearing, a testing device, a testing method, and an assembly method. This three-row roller slewing bearing uses multiple circumferentially arranged tapered sleeves to abut against corresponding upper and lower abutment columns, and also against the upper or lower cage, resulting in better radial stability. The assembly method allows for radial runout detection using the testing device before installing the lower cage and lower outer ring, avoiding rework due to failure to pass inspection at another testing station after installation of the lower cage and lower outer ring. This testing device integrates assembly, mounting surface runout detection, and radial runout detection, greatly simplifying the workflow and reducing the number of equipment required.

[0008] To achieve the above objectives, the present invention provides a three-row roller slewing bearing, comprising an outer upper ring, an outer lower ring, and an inner ring; an upper cage is installed between the inner ring and the outer upper ring, and upper rollers are installed within the upper cage; a lower cage is installed between the inner ring and the outer lower ring, and lower rollers are installed within the lower cage; a middle cage is installed between the outer upper ring and the outer lower ring, and a middle roller is installed within the middle cage; an outer gear ring is provided on the outer side of the outer upper ring; multiple locating pins are installed between the outer upper ring and the outer lower ring; and multiple sets of circumferentially distributed axial elongated holes are formed on the inner ring. Limiting components and connecting pins are installed in the axial elongated holes, with the limiting components and connecting pins spaced apart. Two sets of parallel radial holes are provided on the inner side of the inner ring at each limiting component. The inner end of each radial hole communicates with the axial elongated hole, and the outer end communicates with the upper or lower retainer, respectively. Each limiting component includes a positioning bolt, on which two tapered sleeves are symmetrically installed. An upper abutment and a lower abutment are installed in each of the two sets of radial holes. The tapered surfaces of the tapered sleeves at both ends face each other and abut against the corresponding upper or lower abutment.

[0009] Preferably, the tapered sleeve is threadedly connected to the positioning bolt, and each of the two sets of tapered sleeves has a connecting part at one end facing away from the tapered sleeve, and the connecting part has a connecting hole; the upper abutment and the lower abutment are each provided with an arc-shaped abutment at the end away from the tapered sleeve; a plug is installed at the end of the positioning bolt away from the head, and the plug is adapted to the diameter of the axial long hole.

[0010] Preferably, a sealing strip is installed between the inner ring and the outer upper ring and the outer lower ring respectively; three sets of oil passages and filler nozzles are provided in the outer upper ring and the outer lower ring, and the three sets of oil passages are respectively connected to the upper cage, the middle cage and the lower cage; the filler nozzles are used to open and close the oil passages.

[0011] A second aspect of the present invention provides a testing device for testing a three-row roller slewing bearing, comprising: a main frame, a clamping and conveying mechanism mounted on the upper part of the main frame, a worktable mounted on the bottom, the worktable including two symmetrically arranged arc-shaped plates, a support column provided at the bottom of the arc-shaped plates, and a plurality of supporting balls provided on the arc-shaped plates; a bidirectional lead screw mounted below the worktable, a fixed motor mounted on the outer end of the bidirectional lead screw; a base plate, two sets of nut seats mounted on the bidirectional lead screw, the two sets of nut seats being configured to guide and move on the base plate; a transmission gear and an auxiliary wheel respectively mounted on the two nut seats via a driving component; and an inclined plate mounted on the base plate. The plate has an inclined track groove at its top, with the lower end of the track groove facing the workbench. A slider is installed in the track groove, and a runout detector that can contact the slewing bearing mounting surface is installed on the top of the slider. Two sets of position plates are symmetrically arranged on both sides of the bidirectional lead screw, and a baffle rod for blocking the lateral movement of the inclined plate is installed in the middle of the two sets of position plates. A pull plate is installed on the outer side of the position plate, and a guide plate is installed at the bottom of the position plate. A guide groove that cooperates with the guide plate is opened on the bottom plate. A limiting member is provided, with its output end movably abutting against the side of the pull plate. A traction member is used to laterally pull the inclined plate and the position plate to move laterally, and to drive the runout detector to move laterally.

[0012] Preferably, the clamping and conveying mechanism is equipped with a vertical output component via a fixed frame, and the output end of the vertical output component is equipped with a side-pressure hinged support rod via an upper mounting plate; a central rod is provided in the middle of the base plate, a support block is installed on the central rod, and a guide rod is installed on the support block; a third mounting plate is installed on the guide rod, and a distance sensor is installed on the third mounting plate; the side-pressure hinged support rod includes a pressure-bearing cylinder and a columnar rod inserted into the pressure-bearing cylinder, and a large-diameter chuck adapted to the top of the central rod is provided at the bottom of the pressure-bearing cylinder; an upper ear plate is installed at the bottom of the upper mounting plate, and a lower ear plate is installed at the top of the large-diameter chuck; both the upper and lower ear plates are equipped with hinged support rods, and abutment plates are rotatably installed at the outer ends of the two sets of hinged support rods.

[0013] Preferably, an electromagnetic adsorption component one is provided at the end of the blocking inclined plate, a transverse insert rod installed on the electromagnetic adsorption component one penetrates the pull plate and an electromagnetic adsorption component two is installed at the end, and a transverse spring is provided between the electromagnetic adsorption component one and the pull plate.

[0014] Preferably, the second electromagnetic adsorption component includes a housing and a power supply box, with an electromagnetic absorbing plate installed inside the housing; the electromagnetic absorbing plate has magnetic plates on both sides and a coil installed in the middle; the power supply box is used to energize the coil; the electromagnetic absorbing plate is provided with a groove, and iron end plates are provided at the ends of the transverse insertion rod and the traction member extending into the housing, with the iron end plates matching the grooves.

[0015] Preferably, the traction component is one of an electric push rod, a cylinder, a hydraulic cylinder, or a gear and rack mechanism.

[0016] A third aspect of the present invention provides a method for testing a three-row roller slewing bearing, the method using the aforementioned testing device, comprising: B. Mounting surface runout detection: B1. Place the installed slewing bearing on the ball bearing of the worktable and adjust the axis of the slewing bearing to be the same as the axis of the central rod. B2. The two sets of nut seats on the fixed motor drive the two-way lead screw to move towards each other, so that the transmission gear meshes with the external gear ring, the auxiliary wheel abuts against the slewing bearing, and drives the transmission gear to rotate through the driving component on the nut seat; B3. When the nut seat with the transmission gear installed in step B2 moves toward the center rod, the nut seat presses the inclined plate toward the center rod. The slider moves along the track groove under the restriction of the baffle rod until it reaches the top of the track groove, causing the top of the slider to drive the runout detector to move upward. When the slider moves to the top position of the track groove, the detection end of the runout detector passes upward through the separation position of the two sets of arc plates and abuts against the mounting surface of the slewing bearing; B4. When the inclined plate moves laterally in step B3, the output end of the limiting component abuts against the pull plate; the transverse insert rod installed on the electromagnetic adsorption component one passes through the pull plate and is equipped with electromagnetic adsorption component two at the end; The electromagnetic adsorption component on the inclined plate moves laterally, causing the lateral insertion rod to move and compressing the lateral spring between the electromagnetic adsorption component and the pull plate. When the electromagnetic adsorption component one moves to the minimum distance relative to the pull plate, the transverse insertion rod completes the connection within the electromagnetic adsorption component two. B5. The output end of the limiting component is retracted, causing the inclined plate and the position plate to move laterally; the traction component works, pulling the inclined plate and the position plate to move laterally, completing the installation surface runout detection; C. Radial runout detection: C1. Repeat steps B1-B2; C2. After the clamping and conveying mechanism completes the conveying of the slewing bearing, the elastic pressing output end of the vertical output component continues to press down and abut against the top of the central rod, causing the one-way hinge component in the middle to move downward, and the abutment plate at the side end abuts against the inner wall of the inner ring of the slewing bearing and presses towards the auxiliary wheel side. This causes a change in the radial clearance between the inner ring and the lower or upper outer ring on the side facing the transmission gear. C3. The distance sensor installed on the side of the center rod measures the distance towards the inner ring of the slewing bearing to detect changes in distance. The distance sensor is oriented towards the side of the inner ring wall away from the auxiliary wheel.

[0017] A fourth aspect of the present invention provides an assembly method for assembling the aforementioned three-row roller slewing bearing, the assembly method using the aforementioned detection device, the assembly method comprising: A1. Lay the outer upper ring flat on the workbench; A2, Install the upper cage onto the outer upper ring and install the upper rollers; A3, place the inner ring on the upper retainer and install a sealing strip between the outer upper ring and the inner ring; A4, optional installation of a cage and filling of the cage with intermediate rollers; A5 employs a transmission gear and an auxiliary rotating wheel positioned opposite each other on both sides of the outer upper ring, so that the transmission gear meshes with the outer gear ring and the auxiliary rotating wheel abuts against the outer upper ring, thereby achieving initial fixation of the outer upper ring; A6. Perform radial runout detection on the inner ring, detect the continuous change in the distance between the inner wall of the inner ring and the axis, and export the data to determine whether it conforms to the radial clearance fluctuation range. A7. If the radial clearance fluctuation range does not meet the fluctuation range, remove the middle cage and middle roller; and repeat steps A4-A6 until the middle cage and middle roller meet the radial clearance standard. A8, install the lower cage and the lower roller, then install the outer lower ring. The outer lower ring and the outer upper ring are fixed together by locating pins, and a sealing strip is installed between the lower ring and the inner ring. A9, pre-install a set of tapered sleeves on the positioning bolt. The bolt body of the positioning bolt is stepped. Adjust the position distance of the installed tapered sleeves. Insert the positioning bolt into the axial long hole first, and then connect it to the axial long hole by thread. When inserting, make the tapered sleeve abut against the pre-assembled lower abutment. Then, another set of tapered sleeves is installed at the other end of the axial long hole. The tapered sleeve is then inserted into the connecting hole of the connecting part by rotating the cylinder, and the tapered sleeve is moved downward by rotation. Until the conical sleeve abuts against the pre-assembled upper abutment; install the plug to close the axial long hole for installing the limiting component; A10, inject grease into the oil circuit to complete the fabrication of the three-row roller slewing bearing.

[0018] According to the above technical solution, the present invention has the following beneficial effects: 1. The present invention uses upper and lower abutments to enhance the lateral preload of the corresponding cage, reduce the gap and swing of the inner and outer rings, ensure its load-bearing capacity, and the conical sleeve and abutments can enhance the anti-bending effect; 2. The present invention uses a bottom-up installation method to install the slewing bearing. The slewing bearing is installed layer by layer. When it is installed to the middle cage and middle roller, a compression test is performed. In the compression test, the outer ring of the slewing bearing is fixed and limited, and the inner ring is compressed. The radial gap change of the inner and outer rings of the middle roller is tested to see if it meets the standard range. If it does not meet the standard range, the middle cage and middle roller are replaced. This method eliminates the need for disassembling the entire slewing bearing during testing, saving time and labor intensity. 3. This invention utilizes a track groove on a moving inclined plate, with a sliding block installed within the groove. This allows the runout detector on the block to extend and retract vertically, automatically detecting runout of the slewing bearing mounting surface. An electromagnetic adsorption component is used to move and adhere to the pull plate, changing the inclined plate and position plate from a separated to a connected state. Finally, the connection between the transverse insertion rod and the traction component is achieved by switching the electromagnetic adsorption component on and off, thus enabling the traction component to drive... 4. The radial movement of the runout detector; 5. The two outputs of the vertical output component realize the transportation of the slewing bearing component and the abutment of the single-sided hinge component on the central rod. The one-way hinge forces the inner ring to move relative to the outer ring. The moving gear and the auxiliary wheel realize the limit of the outer ring. The distance sensor detects the distance and judges and records it through external equipment; 6. The present invention can realize the assembly, mounting surface runout detection and radial runout detection in one unit through the detection device of the three-row roller slewing bearing. It greatly simplifies the workflow and the number of equipment. It has great convenience and can realize semi-automatic or fully automatic detection functions.

[0019] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the three-row roller slewing bearing of the present invention. Figure 1 ; Figure 2 for Figure 1 Enlarged view of part A; Figure 3 This is a schematic diagram of the three-row roller slewing bearing of the present invention. Figure 2 ; Figure 4 for Figure 3 Enlarged view of part B; Figure 5 This is a schematic diagram of the conical sleeve of the present invention; Figure 6 This is a schematic flowchart of the assembly method of the present invention; Figure 7 This is a schematic diagram of the assembly and testing device of the present invention. Figure 1 ; Figure 8 This is a schematic diagram of the clamping and conveying mechanism of the present invention; Figure 9 for Figure 8 Enlarged view of part C; Figure 10 This is a schematic diagram of the structure of the worktable of the present invention; Figure 11 This is a schematic diagram of the worktable and bottom device of the present invention; Figure 12 It is a connection structure for inclined plate, position plate, runout detector, limit component and traction component. Figure 1 ; Figure 13 for Figure 12 Top view; Figure 14 It is a connection structure for inclined plate, position plate, runout detector, limit component and traction component. Figure 2 ; Figure 15 This is a top sectional view of the second electromagnetic adsorption component; Figure 16 This is a side sectional view of the second electromagnetic adsorption component; Figure 17 This is a schematic diagram of the structure of electromagnetic adsorption component one; Figure 18 This is a schematic diagram of the assembly and testing device of the present invention. Figure 2 ; Figure 19 for Figure 18 Enlarged view of part D.

[0021] Explanation of reference numerals in the attached figures 1-Main frame; 101-Upper outer ring; 102-Lower outer ring; 103-Inner ring; 104-Upper roller; 105-Lower roller; 106-Middle roller; 107-Positioning pin; 108-Axial elongated hole; 109-Connecting long pin; 110-Radial hole; 111-Positioning long bolt; 112-Conical sleeve; 113-Upper abutment; 114-Lower abutment; 115-Connecting part; 116-Plug; 117-Sealing strip; 118-Oil passage; 119-Adding nozzle; 2-Clamping and conveying mechanism; 21-Vertical output component; 23-Fixed frame; 24-Pressure cylinder; 25-Columnar rod; 26-Upper mounting plate; 27-Side pressure hinge rod; 3-Workbench; 31-Arc-shaped plate; 32-Support column; 33-Ball bearing; 4-Double-acting screw; 41-Fixed motor; 42-Nut 43-Base; 44-Center rod; 45-Drive component; 46-Support block; 47-Guide rod; 48-Third mounting plate; 5-Inclined plate; 51-Railway groove; 52-Slider; 53-Transverse spring; 54-Electromagnetic adsorption component one; 55-Transverse insertion rod; 6-Runout detector; 7-Position plate; 71-Baffle rod; 72-Pull plate; 73-Guide plate; 8-Limiting component; 9-Traction component; 91-Traction rack; 92-Traction motor; 10-Transmission gear; 11-Auxiliary wheel; 12-Guide groove; 13-Distance sensor; 14-Electromagnetic adsorption component two; 141-Casing; 142-Power supply box; 144-Magnetic guide plate; 145-Coil; 146-Iron end plate; 15-Base plate; 271-Upper ear plate; 272-Lower ear plate; 273-Hinged support rod; 274-Abutment plate. Detailed Implementation

[0022] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0023] In this invention, unless otherwise stated, directional terms such as "up, down, left, right, front, back, inside, outside" in the terminology only represent the orientation of the term in its normal use or are common terms understood by those skilled in the art, and should not be regarded as a limitation on the term.

[0024] See Figure 1-5The three-row roller slewing bearing shown includes an outer upper ring 101, an outer lower ring 102, and an inner ring 103. An upper cage is installed between the inner ring 103 and the outer upper ring 101, and an upper roller 104 is installed within the upper cage. A lower cage is installed between the inner ring 103 and the outer lower ring 102, and a lower roller 105 is installed within the lower cage. A middle cage is installed between the outer upper ring 101 and the outer lower ring 102, and a middle roller 106 is installed within the middle cage. An outer gear ring is provided on the outer side of the outer upper ring 101. Multiple locating pins 107 are installed between the outer upper ring 101 and the outer lower ring 102. Multiple sets of circumferentially distributed axially elongated holes 108 are provided on the inner ring 103. Limiting components and connecting pins 109 are installed in the holes 108 respectively, and the limiting components and connecting pins 109 are spaced apart; two sets of parallel radial holes 110 are opened on the inner side of the inner ring 103 at each limiting component, the inner end of the radial holes 110 is connected to the axial long holes 108, and the outer end is connected to the upper retainer or the lower retainer respectively; the limiting component includes a positioning long bolt 111, and two conical sleeves 112 are symmetrically installed on the positioning long bolt 111; an upper abutment post 113 and a lower abutment post 114 are installed in the two sets of radial holes 110 respectively; the conical surfaces of the conical sleeves 112 at both ends are arranged facing each other and abut against the corresponding upper abutment post 113 or lower abutment post 114 respectively.

[0025] By implementing the above technical solution, the lateral abutment effect of the conical sleeve 112 achieves the effect of separately squeezing the upper abutment post 113 and the lower abutment post 114, thereby achieving the effect of laterally squeezing the upper roller 104 and the lower roller 105. This not only strengthens the limiting effect of the corresponding rollers but also enhances the anti-shear effect of the inner ring 103. During the design phase, it is necessary to ensure that the lateral abutment stroke will not damage the structure of the upper and lower cages.

[0026] In this embodiment, such as Figure 4 As shown, the tapered sleeve 112 is threadedly connected to the positioning bolt 111. Each of the two sets of tapered sleeves 112 has a connecting portion 115 at its opposite ends, and the connecting portion 115 has a connecting hole. The upper abutment 113 and lower abutment 114 each have an arc-shaped abutment at their ends away from the tapered sleeve 112. The positioning bolt 111 has a plug 116 installed at its end away from the head, and the plug 116 is compatible with the diameter of the axial elongated hole 108. (Reference) Figure 4 At the bottom, the bottom of the positioning bolt 111 is threaded to the axial long hole 108.

[0027] like Figure 5The diagram shows the structure of the conical sleeve 112. Sealing strips 117 are installed between the inner ring 103 and the outer upper ring 101 and outer lower ring 102, respectively. Three sets of oil passages 118 and oil fillers 119 are provided within the outer upper ring 101 and outer lower ring 102. The three sets of oil passages 118 are respectively connected to the upper cage, middle cage, and lower cage. The oil fillers 119 are used to open and close the oil passages 118. In this embodiment, upper abutments 113 and lower abutments 114 are used to enhance the lateral preload of the corresponding cage, reduce the gap and swing size between the inner and outer rings, ensure its load-bearing capacity, and the conical sleeve 112 and abutments can enhance the anti-bending effect.

[0028] refer to Figures 7-19 As shown, a second aspect of the present invention provides a testing device for testing the three-row roller slewing bearing, comprising: a main frame 1, a clamping and conveying mechanism 2 mounted on the upper part of the main frame 1, and a worktable 3 mounted on the bottom. The worktable 3 includes two symmetrically arranged arc-shaped plates 31, with support columns 32 at the bottom of the arc-shaped plates 31, and a plurality of supporting balls 33 on the arc-shaped plates 31; a bidirectional lead screw 4 mounted below the worktable 3, with a fixed motor 41 mounted on the outer end of the bidirectional lead screw 4; a base plate 15, on which two sets of nut seats 42 are mounted, the two sets of nut seats 42 being configured to guide and move on the base plate 15, and a guide groove 12 is formed on the base plate 15 and connects with a guide plate 73 at the bottom of a position plate 7. The guide plate 73 is as follows: Figure 12 As shown, two sets are arranged to match the inner diameter of the guide groove 12, achieving the effect of moving and guiding; the two nut seats 42 are respectively equipped with transmission gears 10 and auxiliary rotating wheels 11 via drive components 44; see reference Figure 12-14The inclined plate 5 shown is mounted on the base plate 15. An inclined track groove 51 is formed at the top of the inclined plate 5, with the lower end of the track groove 51 facing the worktable 3. A slider 52 is installed inside the track groove 51. A runout detector 6, capable of contacting the slewing bearing mounting surface, is mounted on the top of the slider 52. When the runout detector 6 moves laterally to the top of the track groove 51, its top detection end detects the axial runout of the slewing bearing mounting surface. Two sets of position plates 7 are symmetrically arranged on both sides of the bidirectional lead screw 4. A baffle rod 71 is installed in the middle of each set of position plates 7 to prevent the inclined plate 5 from moving laterally. The baffle rod 71 prevents the inclined plate 5 from moving laterally. A pull plate 72 is installed on the outer side of the position plate 7. A guide plate 73 is installed at the bottom, and a guide groove 12 that cooperates with the guide plate 73 is opened on the bottom plate 15; a limiting member 8 is provided, the output end of which movably abuts against the side of the pull plate 72. The limiting member 8 mainly restricts the position plate 7 from moving towards the traction member 9, ensuring that when the nut seat 42 moves to squeeze the inclined plate 5, the inclined plate 5 passes between the two sets of position plates 7, and the transverse spring 53 is compressed, squeezing the pull plate 72 on the fork plate installed at the output end of the limiting member 8. The fork plate not only plays a limiting role, but also ensures that the baffle rod 71 abuts against the slider 52, so that the runout detector 6 on the slider 52 moves to the top, realizing the runout detection of the bottom mounting surface of the slewing bearing; the traction member 9 is used to laterally pull the inclined plate 5 and the position plate 7 to move laterally, and drive the runout detector 6 to move laterally.

[0029] The detection device for this three-row roller slewing bearing can be used for both testing and assembly. By creating a track groove 51 on the movable inclined plate 5 and installing a sliding block 52 within the track groove 51, the runout detector 6 on the slider 52 can extend and retract vertically, automatically detecting the runout of the slewing bearing mounting surface upwards. An electromagnetic adsorption component 1 54 is used to move and adsorb onto the pull plate 72, thus changing the state of the inclined plate 5 and the position plate 7 from separation to connection. Finally, the connection between the transverse insertion rod 55 and the traction component 9 is achieved by switching the electromagnetic adsorption component 2 14 on and off, allowing the traction component 9 to drive the runout detector... The radial movement of the measuring instrument 6; the two outputs of the vertical output component 21 respectively realize the transportation of the slewing bearing component and the abutment of the single-sided hinge component on the central rod 43. The unidirectional hinge forces the inner ring 103 to move relative to the outer ring. The moving gear and the auxiliary rotating wheel 11 realize the limit of the outer ring. The distance sensor 13 performs distance detection and judges and records it through external equipment. The present invention can realize assembly, mounting surface runout detection and radial runout detection in one unit through the detection device of the three-row roller slewing bearing, which greatly simplifies the workflow and the number of equipment, has great convenience performance, and can realize semi-automatic or fully automatic detection functions.

[0030] In this embodiment, to further provide a clamping and conveying mechanism 2, the clamping and conveying mechanism 2 is equipped with a vertical output component 21 via a fixed frame 23. The output end of the vertical output component 21 is equipped with a side-pressure hinged support rod 273 via an upper mounting plate 26. A central rod 43 is provided in the middle of the base plate 15. A support block 45 is installed on the rod body of the central rod 43, and a guide rod 46 is installed on the support block 45. A third mounting plate 47 is installed on the guide rod 46, and a third mounting plate 47 is installed on the third mounting plate 47. The device is equipped with a distance sensor 13. The side-pressure hinged support rod 273 includes a pressure-bearing cylinder 24 and a columnar rod 25 inserted into the pressure-bearing cylinder 24. The bottom of the pressure-bearing cylinder 24 is provided with a large-diameter chuck that matches the top of the central rod 43. An upper ear plate 271 is installed at the bottom of the upper mounting plate 26, and a lower ear plate 272 is installed at the top of the large-diameter chuck. Both the upper ear plate 271 and the lower ear plate 272 are equipped with hinged support rods 273. Abutment plates 274 are rotatably installed at the outer ends of the two sets of hinged support rods 273. By pressing the center of the chuck against the upper end of the central rod 43 and continuously pressing it down, the end of the side-pressure hinged support rod 273 can move outward and press against the inner wall of the inner ring 103, cooperating with the auxiliary rotating wheel 11 for pressing.

[0031] In this embodiment, an electromagnetic adsorption component 54 is provided at the end of the blocking inclined plate 5. A transverse insert 55 installed on the electromagnetic adsorption component 54 passes through the pull plate 72 and an electromagnetic adsorption component 14 is installed at its end. A transverse spring 53 is provided between the electromagnetic adsorption component 54 and the pull plate 72. The electromagnetic adsorption component 54 is as follows: Figure 17 As shown, the power supply, connected to a suitable coil 145, generates strong magnetism on the magnetic plate 144, thereby achieving electromagnetism and attracting the ferromagnetic plate. The size of the power supply, the magnetic plate 144, and the ferromagnetic plate need to be designed to meet the requirements of attraction, and to overcome the restoring force of the transverse spring 53 during attraction.

[0032] like Figure 15 and 16 As shown, the electromagnetic adsorption component 14 includes a housing 141 and a power supply box 142. An electromagnetic absorbing plate is installed inside the housing 141. The electromagnetic absorbing plate has magnetic plates 144 on both sides and a coil 145 installed in the middle. The power supply box 142 is used to energize the coil 145. The electromagnetic absorbing plate is provided with a groove. Iron end plates 146 are provided at the ends of the transverse insertion rod 55 and the traction member 9 that extend into the housing 141. The iron end plates 146 are adapted to the grooves.

[0033] In this embodiment, the traction member 9 is one of an electric push rod, a pneumatic cylinder, a hydraulic cylinder, or a gear and rack mechanism. The traction member 9 is used to laterally pull the inclined plate 5 and the position plate 7 to move laterally, and to drive the runout detector 6 to move laterally. By setting the stroke length, the lateral movement distance is ensured, driving the position plate 7 and the inclined plate 5 to move radially, thereby realizing the radial movement of the runout detector 6.

[0034] like Figure 18 and 19 As shown, the traction component 9 is a gear and rack mechanism, as follows: Figure 19 As shown, a traction motor 92 is provided, which meshes with a traction rack 91 through a gear installed at its output end. The end of the traction rack 91 is connected to an electromagnetic adsorption component 14, and an iron end plate 146 is installed at the end to achieve electromagnetic adsorption.

[0035] A support block 45 is installed on the body of the central rod 43, and a guide rod 46 is installed on the support block 45; a compression spring is installed on the guide rod 46 to force the position plate 7 to be at the end of the guide rod 46, and a distance sensor 13 is installed on the position plate 7.

[0036] A third aspect of the present invention provides a method for testing a three-row roller slewing bearing, the method using the aforementioned testing device, comprising: B. Mounting surface runout detection: B1, See also Figure 8 The clamping and conveying mechanism 2 includes a fixed frame 23. Clamping drive members 44 on both sides of the fixed frame 23 push the output plate to move towards each other, thereby clamping it on both sides of the slewing bearing. The installed slewing bearing is placed on the ball bearings 33 of the worktable 3, and the axis of the slewing bearing is adjusted to be the same as the axis of the central rod 43. Figure 10 As shown; the worktable 3 is equipped with multiple balls 33 arranged in the same circle, and the axis of the slewing bearing is adjusted to be the same as the axis of the central rod 43; the balls are set so that the rotation of the slewing bearing will not cause friction, resulting in wear on the surface; B2, such as Figure 11 As shown, the fixed motor 41 drives the two sets of nut seats 42 on the bidirectional lead screw 4 to move towards each other, so that the transmission gear 10 meshes with the outer gear ring, the auxiliary rotating wheel 11 abuts against the slewing bearing, and drives the transmission gear 10 to rotate through the driving member 44 on the nut seat 42; the two sides of the bidirectional lead screw 4 pass through the two sides of the main frame 1 and are equipped with closing plates to support the bidirectional lead screw 4. One end of the bidirectional lead screw 4 is coaxially connected to the fixed motor 41. The fixed motor 41 can be a geared motor, which can manually control the driving member 44 to drive the transmission gear 10 to rotate, so as to realize the tooth meshing of the transmission gear 10 with the outer upper ring 101. B3. When the nut seat 42, on which the transmission gear 10 is installed in step B2, moves toward the central rod 43, the nut seat 42 presses against the inclined plate 5 and moves toward the central rod 43. Figure 11 and 12 As shown; The slider 52 moves along the track groove 51 under the restriction of the baffle rod 71 until it reaches the top of the track groove 51, so that the top of the slider 52 drives the jump detector 6 to move upward. When the slider 52 moves to the top position of the track groove 51, the detection end of the runout detector 6 passes upward through the separation position of the two sets of arc plates 31 and abuts against the mounting surface of the slewing bearing. The height of slider 52 rising in the track groove 51 should not exceed the detection stroke of the runout detector 6, to avoid excessive compression during the rise, which could lead to damage to the runout detector 6.

[0037] B4. When the inclined plate 5 moves laterally in step B3, the output end of the limiting member 8 abuts against the pull plate 72; the transverse insert 55 installed on the electromagnetic adsorption member 1 54 passes through the pull plate 72 and is equipped with an electromagnetic adsorption member 2 14 at the end. The electromagnetic adsorption component 54 on the inclined plate 5 moves laterally, causing the lateral insertion rod 55 to move and compressing the lateral spring 53 between the electromagnetic adsorption component 54 and the pull plate 72. When the electromagnetic adsorption component 54 moves to the minimum distance relative to the pull plate 72, the transverse insertion rod 55 completes the connection within the electromagnetic adsorption component 14. Synchronous, such as Figure 14 The top of the electromagnetic adsorption component 54 and the pull plate 72 complete the electromagnetic adsorption. Ferromagnetic plates are provided on both sides of the pull plate 72 facing the electromagnetic adsorption component 54 to complete the electromagnetic adsorption.

[0038] B5. The output end of the limiting component 8 is retracted, causing the inclined plate 5 and the position plate 7 to move laterally; the traction component 9 works, pulling the inclined plate 5 and the position plate 7 to move laterally, completing the installation surface runout detection; Three-row roller slewing bearings have cages with mostly fixed axial lengths and easily controllable heights, therefore... Figure 1 The superimposed upper and lower cages ensure the certainty of the axial length. Combined with the stepped surface limiting between the outer upper ring 101 and outer lower ring 102, the axial height of the three-row roller slewing bearing can be effectively guaranteed. Therefore, most axial test results are within the actual range, and this invention does not involve axial testing. However, since the diameter of the cage is relatively large compared to its height, its variation in the radial direction is difficult to control, so batch testing of radial clearance is required.

[0039] C. Radial runout detection: C1. Repeat steps B1-B2; C2. After the clamping and conveying mechanism 2 completes the conveying of the slewing bearing, the elastic pressing output end of the vertical output member 21 continuously presses down and abuts against the top of the central rod 43, so that the one-way hinge member in the middle moves downward and the abutting plate 274 at the side abuts against the inner wall of the inner ring 103 of the slewing bearing and presses towards the auxiliary wheel 11. Because one side of the slewing bearing meshes with the transmission gear 10 and the other side is with the auxiliary wheel 11, the lateral contact and compression towards the auxiliary wheel 11 causes a change in the radial clearance between the inner ring 103 and the lower outer ring 102 or the upper outer ring 101 on the side facing the transmission gear 10. The unidirectional hinged component includes a pressure-bearing cylinder 24, a columnar rod 25, an upper mounting plate 26, and a side-pressure hinged support rod 273. The output end of the vertical output component 21 is connected to the upper mounting plate 26 and continues to descend, so that the bottom of the pressure-bearing cylinder 24 is connected to the top of the central rod 43. The output end of the vertical output component 21 continues to descend, and the bottom end of the columnar rod 25 connected to the upper mounting plate 26 is inserted into the pressure-bearing cylinder 24 and squeezes the pressure spring inside the pressure-bearing cylinder 24.

[0040] C3. The distance sensor 13, which is installed on the side of the central rod 43, measures the distance towards the inner ring 103 of the slewing bearing to detect the change in distance. The distance sensor 13 is oriented towards the side of the inner wall of the inner ring 103 away from the auxiliary wheel 11.

[0041] The distance sensor 13 installed on the central rod 43 faces the inner ring 103 of the slewing bearing to detect distance changes. The orientation is the side of the inner wall of the inner ring 103 away from the auxiliary wheel 11. For example, the distance sensor 13 is an infrared sensor. It emits infrared rays through the detection end to the inner wall of the inner ring 103 to obtain data A1. According to the data A recorded in the standard, the deviation value A2 = A1 - A is obtained. When the obtained A2 value is positive, it means that the inner ring 103 is extending outward; when it is negative, it means that the inner ring 103 is contracting inward. All data is recorded and transmitted to external equipment for recording, judgment and display, so as to obtain the distance change fluctuation of the inner ring 103 relative to the outer upper ring 101, and to determine whether the gap is out of range based on this result.

[0042] If the results of the mounting surface runout test or radial runout test do not meet the standard range, disassembly and replacement are required. The vertical output component 21 in the middle of the clamping and conveying mechanism 2 is pressed down, so that it abuts against the top of the central rod 43, and then the one-way hinge component of the downward moving part is compressed and expanded, and the one-way side abuts against the inner ring 103 of the slewing bearing; relatively speaking, the inner ring 103 is compressed, and the outer ring is fixed; when the inner ring 103 produces radial movement, the distance sensor 13 is set accordingly to detect the position distance of the inner ring 103; thus completing the radial clearance detection.

[0043] By designing a track groove 51 on the movable inclined plate 5 and installing a sliding block 52 on the inclined surface in the track groove 51, the jump detector 6 on the slider 52 can be extended and retracted up and down, realizing automatic upward jump detection of the slewing bearing mounting surface; by setting an electromagnetic adsorption component 1 54, it can be moved and adsorbed on the pull plate 72, thereby realizing the change from separation to connection between the inclined plate 5 and the position plate 7; then, by turning the electromagnetic adsorption component 2 14 on and off, the transverse insertion rod 55 and the traction component 9 can be connected, thereby realizing the radial movement of the jump detector 6 driven by the traction component 9.

[0044] Similarly, the two outputs of the vertical output component 21 respectively realize the transport of the slewing bearing component and the abutment of the single-sided hinge component on the central rod 43. The unidirectional hinge forces the inner ring 103 to move relative to the outer ring; while the transmission gear 10 and the auxiliary rotating wheel 11 limit the outer ring. On the one hand, the meshing of the transmission gear 10 with the slewing bearing realizes the rotation of the slewing bearing. On the other hand, for conventional meshing, there must be a gap between the teeth to ensure that the root is not cut. Therefore, when limiting the outer ring, the auxiliary rotating wheel 11 is needed to ensure the pressing position on both sides. That is, one set realizes the meshing transmission, and the other set realizes the position limitation.

[0045] This invention achieves the detection of runout and radial clearance of the mounting surface by setting two structures, which has great convenience and can realize semi-automatic or fully automatic detection functions.

[0046] A fourth aspect of the present invention provides an assembly method for assembling the aforementioned three-row roller slewing bearing, the assembly method using the aforementioned detection device, the assembly method comprising: A1, Lay the outer upper ring 101 flat on the workbench 3; A2, install the upper cage on the outer upper ring 101 and install the upper roller 104; A3, place the inner ring 103 on the upper retainer, and install the sealing strip 117 between the outer upper ring 101 and the inner ring 103; A4, optional installation of a cage, and filling of the cage with intermediate rollers 106; A5, with a transmission gear 10 and an auxiliary rotating wheel 11 arranged opposite to each other on both sides of the outer upper ring 101, the transmission gear 10 meshes with the outer gear ring, and the auxiliary rotating wheel 11 abuts against the outer upper ring 101, so as to achieve the initial fixation of the outer upper ring 101. A6. Perform radial runout detection on the inner ring 103, detect the continuous change in the distance between the inner wall of the inner ring 103 and the axis, and export the data to determine whether it conforms to the radial clearance fluctuation range. Distance sensor 13 detects a continuous change in distance to the inner ring 103 as it completes one revolution. The data is then exported for device verification to determine if it falls within the radial clearance fluctuation range. Distance sensor 13 can be either infrared or optical, among other methods. For example, an infrared sensor measures distance and time by emitting infrared images along their back-and-forth path, detecting the distance change from the inner ring 103 to the detection end. This detected distance is recorded, analyzed, and displayed by an external device, thus obtaining the distance change value of the inner ring 103 relative to the outer upper ring 101.

[0047] A7. If the radial clearance fluctuation range does not meet the fluctuation range, remove the middle cage and middle roller 106; and repeat steps A4-A6 until the middle cage and middle roller 106 meet the radial clearance standard. The radial clearance is related to the middle cage, the outer upper ring 101, and the inner ring 103. The inner ring 103 undergoes surface heat treatment during production, so it is rarely replaced. Therefore, only the side of the outer upper ring 101 facing the inner ring 103 and the middle cage need grinding. Replacing the outer upper ring 101 would cause misalignment with the outer lower ring 102, so it is generally not replaced. This invention chooses to replace the middle cage because the outer upper ring 101 is fixed, making replacement more convenient.

[0048] A8, install the lower retainer and the lower roller 105, and then install the outer lower ring 102. The outer lower ring 102 and the outer upper ring 101 are fixed together by the locating pin 107. At the same time, a sealing strip 117 is installed between the lower ring and the inner ring 103. A9, a set of tapered sleeves 112 are pre-installed on the positioning bolts 111. The bolt body of the positioning bolts 111 is stepped. Adjust the position distance of the installed tapered sleeves 112. First, insert the positioning bolt 111 into the axial long hole 108, and then thread it into the axial long hole 108. When inserted, the tapered sleeve 112 abuts against the pre-assembled lower abutment post 114. Then, another set of tapered sleeves 112 are installed at the other end of the axial long hole 108. The rotating cylinder is inserted into the connecting hole of the connecting part 115, and the rotation drives the tapered sleeves 112 to move downward. Until the tapered sleeve 112 abuts against the pre-assembled upper abutment post 113; install the plug 116 to close the axial elongated hole 108 for installing the limiting component; A10, inject grease into oil passage 118 to complete the fabrication of the three-row roller slewing bearing.

[0049] refer to Figure 6This assembly method uses a bottom-up approach to install the three-row roller slewing bearing; that is, first install the outer upper ring 101 → upper roller 104 → inner ring 103 → middle cage → fix and press → check if the distance change is qualified → for qualified products, install the lower cage; for unqualified products, replace the middle cage → install the limiting components → inject grease. The upper abutment 113 and lower abutment 114 inside the inner ring 103 are pre-installed before the inner ring 103 is installed.

[0050] This assembly method differs from existing technologies by employing a bottom-up approach to slewing bearing installation. The slewing bearing is installed layer by layer, and a compression test is performed when the intermediate cage and intermediate roller 106 are installed. During the compression test, the outer ring of the slewing bearing is fixed and limited, while the inner ring 103 is compressed. The radial clearance variation between the inner and outer rings of the intermediate roller 106 is tested to see if it meets the standard range. If not, the intermediate cage and intermediate roller 106 are replaced. This method eliminates the need for complete disassembly of the slewing bearing for testing existing slewing bearings, saving time and labor intensity associated with disassembly and assembly.

[0051] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0052] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0053] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A three-row roller slewing bearing, characterized in that, It includes an outer upper ring (101), an outer lower ring (102), and an inner ring (103); an upper cage is installed between the inner ring (103) and the outer upper ring (101), and an upper roller (104) is installed inside the upper cage; a lower cage is installed between the inner ring (103) and the outer lower ring (102), and a lower roller (105) is installed inside the lower cage; a middle cage is installed between the outer upper ring (101) and the outer lower ring (102), and a middle roller (106) is installed inside the middle cage; an outer toothed ring is provided on the outer side of the outer upper ring (101); Multiple positioning pins (107) are installed between the outer upper ring (101) and the outer lower ring (102); multiple sets of axially elongated holes (108) are provided on the inner ring (103), and limiting components and connecting pins (109) are respectively installed in the multiple sets of axially elongated holes (108), and the limiting components and connecting pins (109) are spaced apart; The inner ring (103) has two sets of parallel radial holes (110) on the inner side of each limiting member. The inner end of the radial hole (110) is connected to the axial long hole (108), and the outer end is connected to the upper retainer or the lower retainer respectively. The limiting component includes a positioning bolt (111), on which two conical sleeves (112) are symmetrically installed; an upper abutment (113) and a lower abutment (114) are respectively installed in the two sets of radial holes (110); the conical surfaces of the conical sleeves (112) at both ends are arranged facing each other and respectively abut against the corresponding upper abutment (113) or lower abutment (114).

2. The three-row roller slewing bearing according to claim 1, characterized in that, The conical sleeve (112) is threadedly connected to the positioning bolt (111). Both sets of conical sleeves (112) are provided with a connecting part (115) at opposite ends. The connecting part (115) is provided with a connecting hole. The upper abutment (113) and the lower abutment (114) are provided with an arc-shaped abutment at the ends away from the conical sleeve (112). The positioning bolt (111) is provided with a plug (116) at the end away from the head. The plug (116) is adapted to the diameter of the axial long hole (108).

3. The three-row roller slewing bearing according to claim 2, characterized in that, A sealing strip (117) is installed between the inner ring (103) and the outer upper ring (101) and the outer lower ring (102) respectively; three sets of oil passages (118) and oil filler nozzles (119) are provided in the outer upper ring (101) and the outer lower ring (102), and the three sets of oil passages (118) are respectively connected to the upper retainer, the middle retainer and the lower retainer; the oil filler nozzles (119) are used to open and close the oil passages (118).

4. A testing device for testing the three-row roller slewing bearing according to any one of claims 1-3, comprising: The main frame (1) is equipped with a clamping and conveying mechanism (2) on its upper part and a worktable (3) on its bottom. The worktable (3) includes two symmetrically separated arc-shaped plates (31) with a support column (32) at the bottom of the arc-shaped plate (31) and multiple ball bearings (33) for support on the arc-shaped plate (31). A bidirectional lead screw (4) is installed below the workbench (3), and a fixed motor (41) is installed at the outer end of the bidirectional lead screw (4). The base plate (15) has two sets of nut seats (42) installed on the bidirectional lead screw (4), and the two sets of nut seats (42) are configured to be able to move on the base plate (15). A transmission gear (10) and an auxiliary wheel (11) are respectively mounted on the two nut seats (42) via a drive member (44). An inclined plate (5) is installed on the base plate (15). An inclined track groove (51) is provided on the top of the inclined plate (5). The end of the track groove (51) facing the workbench (3) is the lower end. A slider (52) is installed in the track groove (51), and a runout detector (6) that can contact the mounting surface of the slewing bearing is installed on the top of the slider (52). The position plates (7) are symmetrically arranged in two sets on both sides of the bidirectional lead screw. The two sets of position plates (7) are equipped with baffle rods (71) for blocking the lateral movement of the inclined plate (5). A pull plate (72) is installed on the outside of the position plate (7), a guide plate (73) is installed on the bottom of the position plate (7), and a guide groove (12) that cooperates with the guide plate (73) is provided on the bottom plate (15). The limiting member (8) has its output end movably abutting against the side of the pull plate (72); The traction component (9) is used to laterally pull the inclined plate (5) and the position plate (7) to move laterally, and to drive the jump detector (6) to move laterally.

5. The detection device according to claim 4, characterized in that, The clamping and conveying mechanism (2) is equipped with a vertical output component (21) via a fixed frame (23), and the output end of the vertical output component (21) is equipped with a side-pressure hinge support rod (27) via an upper mounting plate (26). A central rod (43) is provided in the middle of the base plate (15). A support block (45) is installed on the rod body of the central rod (43). A guide rod (46) is installed on the support block (45). A third mounting plate (47) is installed on the guide rod (46). A distance sensor (13) is installed on the third mounting plate (47). The side-pressure hinged support rod (27) includes a pressure-bearing cylinder (24) and a columnar rod (25) inserted into the pressure-bearing cylinder (24). The bottom of the pressure-bearing cylinder (24) is provided with a large-diameter chuck that is adapted to the top of the central rod (43). The upper mounting plate (26) is equipped with an upper ear plate (271) at the bottom, and the large-diameter chuck is equipped with a lower ear plate (272) at the top. Both the upper ear plate (271) and the lower ear plate (272) are equipped with hinged support rods (273), and the outer ends of the two sets of hinged support rods (273) are rotatably equipped with abutment plates (274).

6. The detection device according to claim 4, characterized in that, The end of the blocking inclined plate (5) is provided with an electromagnetic adsorption component one (54), and the transverse insertion rod (55) installed on the electromagnetic adsorption component one (54) passes through the pull plate (72) and is provided with an electromagnetic adsorption component two (14) at the end. A transverse spring (53) is provided between the electromagnetic adsorption component one (54) and the pull plate (72).

7. The detection device according to claim 6, characterized in that, The electromagnetic adsorption component 2 (14) includes a housing (141) and a power supply box (142). An electromagnetic suction plate is installed inside the housing (141). The electromagnetic suction plate has magnetic plates (144) on both sides and a coil (145) in the middle. The power supply box (142) is used to energize the coil (145); the electromagnetic suction plate is provided with a groove, and iron end plates (146) are provided at the ends of the transverse insertion rod (55) and the traction member (9) extending into the casing (141), and the iron end plates (146) are adapted to the groove.

8. The detection device according to claim 4, characterized in that, The traction component (9) is one of an electric push rod, a cylinder, a hydraulic cylinder, or a gear and rack mechanism.

9. A method for testing a three-row roller slewing bearing, the method using the testing device according to any one of claims 4-8, comprising: B. Mounting surface runout detection: B1. Place the installed slewing bearing on the ball bearing (33) of the worktable (3) and adjust the axis of the slewing bearing to be the same as the axis of the central rod (43); B2. The fixed motor (41) drives the two sets of nut seats (42) on the bidirectional lead screw (4) to move towards each other, so that the transmission gear (10) meshes with the external gear ring, the auxiliary wheel (11) abuts against the slewing bearing, and drives the transmission gear (10) to rotate through the driving component (44) on the nut seat (42). B3. When the nut seat (42) with the transmission gear (10) installed in step B2 moves toward the central rod (43), the nut seat (42) presses the inclined plate (5) toward the central rod (43). The slider (52) moves along the track groove (51) under the restriction of the baffle rod (71) until the top of the track groove (51), so that the top of the slider (52) drives the jump detector (6) to move upward; When the slider (52) moves to the top position of the track groove (51), the detection end of the runout detector (6) passes upward through the separation position of the two sets of arc plates (31) and abuts against the mounting surface of the slewing bearing; B4. When the inclined plate (5) moves laterally in step B3, the output end of the limiting member (8) abuts against the pull plate (72); the transverse insert (55) installed on the electromagnetic adsorption member one (54) passes through the pull plate (72) and is equipped with electromagnetic adsorption member two (14) at the end. The electromagnetic adsorption component 1 (54) on the inclined plate (5) moves laterally, driving the lateral insertion rod (55) to move, and squeezing the lateral spring (53) between the electromagnetic adsorption component 1 (54) and the pull plate (72). When the electromagnetic adsorption component one (54) moves to the minimum distance relative to the pull plate (72), the transverse insertion rod (55) completes the connection within the electromagnetic adsorption component two (14); B5. The output end of the limiting component (8) is retracted, causing the inclined plate (5) and the position plate (7) to move laterally; the traction component (9) works, pulling the inclined plate (5) and the position plate (7) to move laterally, completing the installation surface runout detection; C. Radial runout detection: C1. Repeat steps B1-B2; C2. After the clamping and conveying mechanism (2) completes the conveying of the slewing bearing, the elastic pressing output end of the vertical output component (21) it is provided with continues to press down and abut against the top of the central rod (43), so that the one-way hinge component in the middle moves downward and the abutment plate (274) at the side end abuts against the inner wall of the inner ring (103) of the slewing bearing and presses towards the auxiliary wheel (11). This causes a change in the radial clearance between the inner ring (103) facing the transmission gear (10) and the lower outer ring (102) or the upper outer ring (101); C3. The distance sensor (13) installed on the side of the central rod (43) is directed toward the inner ring (103) of the slewing bearing to detect the change in distance. The distance sensor (13) is directed toward the side of the inner wall of the inner ring (103) away from the auxiliary wheel (11).

10. An assembly method for assembling the three-row roller slewing bearing of claim 3, wherein the assembly method uses the detection device of any one of claims 4-8, characterized in that, The assembly method includes: A1, lay the outer upper ring (101) flat on the workbench (3); A2, install the upper cage on the outer upper ring (101) and install the upper roller (104). A3, place the inner ring (103) on the upper retainer and install a sealing strip (117) between the outer upper ring (101) and the inner ring (103). A4, optional installation of a middle cage, and filling the middle cage with middle rollers (106). A5, with a transmission gear (10) and an auxiliary rotating wheel (11) arranged opposite to each other on both sides of the outer upper ring (101), the transmission gear (10) meshes with the outer gear ring, and the auxiliary rotating wheel (11) abuts against the outer upper ring (101), thus achieving the initial fixation of the outer upper ring (101); A6. Radial runout detection is performed on the inner ring (103). The distance between the inner wall of the inner ring (103) and the axis changes continuously. The data is exported to determine whether it conforms to the radial clearance fluctuation range. A7. If the radial clearance fluctuation range does not meet the fluctuation range, remove the middle cage and middle roller (106); and repeat steps A4-A6 until the middle cage and middle roller (106) meet the radial clearance standard. A8, install the lower retainer and the lower roller (105), and then install the outer lower ring (102). The outer lower ring (102) and the outer upper ring (101) are fixed together by a positioning pin (107), and a sealing strip (117) is installed between the lower ring (102) and the inner ring (103). A9, pre-install a set of tapered sleeves (112) on the positioning bolt (111). The bolt body of the positioning bolt (111) is stepped. Adjust the position distance of the installed tapered sleeves (112). The positioning bolt (111) is first inserted into the axial long hole (108), and then threaded into the axial long hole (108). When inserted, the tapered sleeve (112) abuts against the pre-assembled lower abutment (114). Then, another set of tapered sleeves (112) are installed at the other end of the axial long hole (108). The tapered sleeves (112) are inserted into the connecting hole of the connecting part (115) by rotating the cylinder and rotating to move the tapered sleeves (112) downward. Until the conical sleeve (112) abuts against the pre-assembled upper abutment (113); install the plug (116) to close the axial elongated hole (108) for installing the limiting component. A10, inject grease into the oil passage (118) to complete the fabrication of the three-row roller slewing bearing.

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