Nut positioning device

Abstract

The utility model relates to mechanical assembly technical field, concretely is a nut positioning device, including nut clamp and transverse hydraulic oil cylinder, the nut clamp is installed below the hole position needing to assemble bolt, including reference side and clamping side, the transverse hydraulic oil cylinder removes the clamping side, drives the opening and closing of nut clamp to realize clamping nut, the device provides the huge clamping force for the nut through the nut clamp, and the assembly efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of mechanical assembly technology, specifically a nut positioning device. Background Technology

[0002] In the field of mechanical assembly, the connection between bolts and nuts remains one of the core methods for fixing various equipment components due to its high reliability and strong disassembly capability. Currently, for assembly operations involving certain holes, there is still an operational mode that relies on manual holding of the nut for tightening. The specific process is as follows: the operator needs to manually hold the nut below the hole to precisely align it with the bolt inserted above. Then, another person or the same person switches tools and uses equipment such as an electric gun to tighten the bolt from above the hole, ultimately achieving the fastening between components.

[0003] When manually holding the nut below the hole, the operator's hand has limited reach, making it difficult to quickly and stably position the nut in the preset position that fits the hole. Furthermore, the operator must continuously adjust the nut's posture during bolt insertion to ensure thread alignment. Repeatedly probing and fine-tuning the holding angle are necessary to achieve the initial fit between the nut and bolt, significantly extending the assembly time at a single point and resulting in low overall work efficiency.

[0004] To ensure the structural strength and stability of the connection points, the electric tightening gun needs to output a very high tightening torque during assembly. In conventional technical solutions, the nut is entirely positioned manually by holding it below the hole. When the electric tightening gun tightens the bolt, it generates a strong reaction force, which is directly transmitted to the hand holding the nut. The operator needs to continuously apply a large grip force to counteract the reaction force and prevent the nut from rotating or shifting synchronously with the bolt. Prolonged exposure to high torque reaction forces will cause rapid fatigue in the operator's hand, wrist, and arm muscles. This not only wastes a lot of manpower but may also lead to decreased grip stability due to muscle weakness, resulting in problems such as nut misalignment and insufficient bolt tightening torque, affecting assembly quality. At the same time, the high-intensity gripping operation also increases the risk of hand strain for the operator, which is detrimental to work safety and sustainability. Utility Model Content

[0005] The purpose of this invention is to provide a positioning and fastening device and method for wind turbine hub and reinforcing plate, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a nut positioning device, comprising a nut clamp and a transverse hydraulic cylinder; the nut clamp is installed below the hole where the bolt needs to be assembled, and includes a reference side and a clamping side; the transverse hydraulic cylinder moves the clamping side, thereby opening and closing the nut clamp to clamp the nut.

[0007] Preferably, the reference side and the clamping side are combined to form a plurality of nut grooves, and the arc of the arrangement of the nut grooves is the same as that of the corresponding assembly holes; the reference side is fixed relative to the transverse hydraulic cylinder, and the clamping side is fixed to the piston rod of the transverse hydraulic cylinder.

[0008] Preferably, it also includes a lifting frame and a lifting machine, wherein the transverse hydraulic cylinder and the nut clamp are fixed to the lifting frame, and the lifting machine is used to lift the lifting frame.

[0009] Preferably, the lifting frame includes an upper platform and a lower platform, the nut clamp is disposed on the upper platform, and the transverse hydraulic cylinder is disposed on the lower platform; the reference side is fixed to the upper platform, and a slider is fixed at the bottom of the clamping side. The slider passes through the upper platform and is fixed to the piston rod of the transverse hydraulic cylinder. The upper platform has a slot for the slider to move laterally.

[0010] Preferably, the upper platform is further provided with two fixing blocks, which are located at both ends of the nut clamp respectively; a groove is formed between the fixing blocks and the upper platform, and the shape of the groove matches the two ends of the clamping side to guide the lateral movement of the clamping side.

[0011] Preferably, the elevator is fixed to a mounting frame, and its output end moves longitudinally. The lifting frame is fixed to the output end of the elevator. Longitudinal guide rods are provided on both sides of the mounting frame. Linear bearings are connected to both sides of the lifting frame, and the linear bearings cooperate with the guide rods.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. This utility model provides a reliable clamping force to the nut using a nut clamp, thereby preventing the nut from rotating under the strong torque of the electric gun. The operator only needs to use the electric gun above to complete the bolt and nut tightening operation, which not only improves the assembly efficiency but also reduces manpower consumption. At the same time, it can avoid assembly interruption and safety problems caused by insufficient physical strength.

[0014] 2. This utility model uses a lifting mechanism to adjust the horizontal height of the nut clamp, so as to automatically push the nut below the installation hole, thereby enhancing the height adaptability of the nut clamp;

[0015] 3. The nut clamp, the horizontal hydraulic cylinder, and the lifting platform are the core components of this utility model. The nut clamp can be replaced with a nut clamp that is compatible with different types of nuts according to actual needs, while retaining the structural design of the horizontal hydraulic cylinder, the lifting platform, and the lifting platform and mounting frame, which is convenient and quick. Attached Figure Description

[0016] Figure 1This is a structural schematic diagram of one application embodiment of the present utility model;

[0017] Figure 2 This is a top view of an application embodiment of this utility model;

[0018] Figure 3 This is a structural schematic diagram of the tall column and related structures in an application embodiment of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the first hydraulic cylinder and quick clamp in an application embodiment of this utility model;

[0020] Figure 5 This is a structural schematic diagram of the tall column and related structures from another perspective of an application embodiment of this utility model;

[0021] Figure 6 This is a structural schematic diagram of an application embodiment of the present utility model;

[0022] Figure 7 This is a schematic diagram of the structure after the lower reinforcing plate is hoisted in an application embodiment of this utility model;

[0023] Figure 8 Is Figure 7 A schematic diagram of the structure after the upper reinforcing plate is hoisted onto the foundation;

[0024] Figure 9 Is Figure 8 A schematic diagram of the structure after the wheel hub is hoisted onto the foundation;

[0025] Figure 10 Is Figure 8 Top view after the wheel hub has been hoisted onto the foundation;

[0026] Figure 9 and Figure 10 Only a simplified version of the wheel hub is shown in the image. The simplified version retains the flange face and surrounding structure used for mounting the two reinforcing plates. Detailed Implementation

[0027] This utility model discloses a nut positioning device. To better illustrate this, the following application embodiment of the nut positioning device is provided: a positioning and fastening device for a wind turbine generator hub and reinforcing plates. This positioning and fastening device is used to assemble the hub and two reinforcing plates, which are installed on the hub flange face. (See also...) Figures 1 to 10 The attached figure shows an embodiment of the positioning and fastening device and a schematic diagram of using the device to hoist the wheel hub 11 and the reinforcing plate.

[0028] In this application embodiment, the inner circumference of the hub flange surface has six evenly distributed flange plates 14. Each flange plate 14 has a set of mounting holes. That is, by rotating the hub flange surface by an integer multiple of 60° around the center of the top view, the mounting holes on the inner circumference of the hub 11 can be made to coincide with the original mounting holes.

[0029] The two reinforcing plates are identical in shape and size, each with six evenly distributed lugs 15 on its outer periphery. Each lug 15 has a set of mounting holes. This means that by rotating the reinforcing plate by an integer multiple of 60° around its top view center, the mounting holes on the outer periphery of the reinforcing plate can be aligned with the original mounting holes. According to this application embodiment, during assembly, the two reinforcing plates are at different horizontal heights. Based on this vertical relationship, the two reinforcing plates are divided into an upper reinforcing plate 12 and a lower reinforcing plate 13. The number, shape, and arrangement curvature of the mounting holes on the hub flange plate 14 and the reinforcing plate lugs 15 correspond to each other.

[0030] A schematic diagram of the hub flange face and the reinforcing plate can be found in [reference needed]. Figures 7 to 10 , Figure 10 The aforementioned angular rotation relationship is also presented in the text.

[0031] The positioning and fastening equipment includes a support ring 21, a slewing bearing 22, a geared motor 25, a column, a hydraulic cylinder, and a nut positioning device 6. See details. Figure 1 and Figure 2 The outer ring of the slewing bearing 22 is fixed to multiple columns via a ring-shaped frame. The outer ring of the slewing bearing 22 is fixed to the upper side of this ring-shaped frame, which shares a central axis with the slewing bearing 22. The lower side of the ring-shaped frame is fixed to multiple columns, with six columns evenly spaced along the slewing bearing 22. The bottom of the six columns is fixed to the ground with chemical anchors, providing support for the entire equipment. Grounding points are located near the bottom of the columns; before using the equipment, it must be ensured that it is grounded. A pad is used for transition between the columns and the ground to increase the stress area and reduce damage to the ground from the equipment. Due to ground unevenness and manufacturing errors, gaps inevitably occur between the columns and the pad during installation. These gaps are filled with inserts to ensure even stress distribution on the columns. Because the top of the columns is at a certain height from the ground, a ladder is also provided on the outside of the equipment to assist workers in raising their operating height.

[0032] The columns extend upwards from the inner side of the slewing bearing 22. Based on the height of the top of the column, the columns are divided into tall columns 31 and short columns 32, with the same number of tall columns 31 and short columns 32, spaced apart. According to the shape of the slewing bearing 22, any one of the six columns can be randomly selected and rotated from its position to the position of its adjacent column. The rotation between these two positions requires only a 60° rotation of the inner ring of the slewing bearing 22. This angular rotation relationship can be found in [reference needed]. Figure 2 .

[0033] A first hydraulic cylinder 51 and a second hydraulic cylinder 52 are installed on the tall column 31, used for placing and raising / lowering the upper reinforcing plate 12 and the lower reinforcing plate 13, respectively. (See reference...) Figure 3 and Figure 4 A second hydraulic cylinder 52 is fixed to the top of the tall column 31. After the lower reinforcing plate 13 is hoisted into place, it is located on the upper surface of the second hydraulic cylinder 52. The horizontal height of the lower reinforcing plate 13 can be adjusted by controlling the output end of the second hydraulic cylinder 52. A special bracket 26 is fixed to the side of the tall column 31. The first hydraulic cylinder 51 is fixed to a quick clamp 53. Using the quick clamp 53, the first hydraulic cylinder 51 can be clamped to the special bracket 26 or to the lower reinforcing plate 13. After the upper reinforcing plate 12 is hoisted into place, it is located on the upper surface of the first hydraulic cylinder 51 clamped on the lower reinforcing plate 13. Supported by the first hydraulic cylinder 51, the horizontal height of the upper reinforcing plate 12 can be adjusted by controlling the output end of the first hydraulic cylinder 51.

[0034] Both the first hydraulic cylinder 51 and the second hydraulic cylinder 52 are equipped with laser sensors 9. The laser sensors 9 are installed beside the corresponding hydraulic cylinders to detect their operating status: the laser sensor 9 for detecting the first hydraulic cylinder 51 is fixed to the quick-clamp 53, and the laser sensor 9 for detecting the second hydraulic cylinder 52 is fixed to the top of the tall column 31. After the first hydraulic cylinder 51 and the second hydraulic cylinder 52 are installed, they can be connected to the hydraulic pump station 24 via oil pipes. The hydraulic pump station 24 is fixed to the tall column 31 and located at the lower part of the tall column 31.

[0035] See Figure 5 A mounting platform 43 is fixed to the side of the top of the tall column 31. The upper surface of the mounting platform 43 is lower than the upper surface of the retracted second hydraulic cylinder 52. One end of the reinforcing plate guide pin 41 is threaded to the mounting platform 43, and the other end has a through hole for inserting a sliding rod 44. The reinforcing plate guide pin 41 can be installed or removed through the sliding rod 44. A proximity switch 8 is provided below the mounting platform 43. The proximity switch 8 is fixed directly below the threaded hole through a connecting plate and is used to detect whether the reinforcing plate guide pin 41 is installed in place. With the above structure, the reinforcing plate guide pin 41 can be detachably installed at the top of the tall column 31.

[0036] Three tall columns 31 are equipped with three reinforcing plate guide pins 41. Based on the positional distribution of the tall columns 31 and for ease of guidance, the three reinforcing plate guide pins 41 are respectively positioned at the center of the top surface of each tall column 31. This allows the three reinforcing plate guide pins 41 to pass through the three non-adjacent mounting holes of the reinforcing plate's lugs 15 during hoisting. These mounting holes are located in the middle of the same group of mounting holes. Before hoisting the reinforcing plate, the center hole position on the reinforcing plate lugs 15 needs to be marked for faster positioning. To further reduce operational difficulty, the three reinforcing plate guide pins 41 have different lengths, allowing for sequential alignment when the reinforcing plate is in place.

[0037] A nut positioning device 6 is installed at the top of the short column 32. This device positions the nut below the lower reinforcing plate 13 and directly opposite the mounting hole after the hub 11 and reinforcing plate are positioned. The nut positioning device 6 includes a lifting mechanism 63, a transverse hydraulic cylinder 66, and a nut clamp capable of holding the nut. See details... Figure 6 The nut clamp includes a reference side 67 and a clamping side 68. The reference side 67 and the clamping side 68 are combined to form multiple nut grooves 65. The arrangement of the nut grooves 65 is the same as the mounting holes on each set of hubs 11 and reinforcing plates.

[0038] The lifting platform 63 is fixed to a mounting frame 61, which is fixed to the top of the short column 32. Longitudinal guide rods 62 are provided on both sides of the mounting frame 61. The lifting platform 63 is manually raised and lowered using a wheel. Its output end moves longitudinally and is fixed to a lifting frame 64. The movement of the output end of the lifting platform 63 is consistent with the arrangement direction of the guide rods 62. The connection between the output end and the lifting frame 64 is located at the bottom center of the lifting frame 64. Linear bearings 643 are connected to both sides of the lifting frame 64, and the linear bearings 643 cooperate with the guide rods 62. The lifting frame 64 includes upper and lower platforms. A nut clamp is located on the upper platform 641. The reference side 67 and the clamping side 68 are located in the same plane. The reference side 67 is fixed to the upper platform 641 with bolts, and the clamping side 68 is in sliding engagement with the upper platform 641. The reference side 67 is closer to the outside of the equipment than the clamping side 68.

[0039] A transverse hydraulic cylinder 66 is fixed to the lower platform 642 so that the overall horizontal height of the nut clamp is higher than that of the transverse hydraulic cylinder 66. The transverse hydraulic cylinder 66 is connected to a manual hydraulic pump 69 via an oil pipe. Operating the manual hydraulic pump 69 allows the piston rod of the transverse hydraulic cylinder 66 to move laterally. A slider 645 is fixed to the bottom of the clamping side 68. The slider 645 passes through the upper platform 641 and is fixed to the piston rod. The upper platform 641 has a slot for the slider 645 to move laterally. The lower part of the clamping side 68 is fixed to the piston rods of two transverse hydraulic cylinders 66. These two transverse hydraulic cylinders 66 are symmetrically arranged about the vertical plane of the clamping side 68. Driven by the piston rods, the clamping side 68 can move closer to or away from the reference side 67. The upper platform 641 also has two fixing blocks 644, located at both ends of the nut clamp. A groove is formed between the fixing blocks 644 and the upper platform 641. The shape of the groove matches the two ends of the clamping side 68, guiding the lateral movement of the clamping side 68.

[0040] The lifting platform 63, under manual operation, can raise and lower the transverse hydraulic cylinder 66 and the nut clamp on the entire lifting frame 64 to position the nut clamp appropriately. The transverse hydraulic cylinder 66 moves the clamping side 68, causing the nut clamp to open and close—opening the nut clamp to the appropriate size and inserting the corresponding nut; or, after inserting the nut, clamping it to provide a strong clamping force. The nut clamp is fixed to the lifting frame 64 via a threaded connection, and a suitable nut clamp can be installed according to the required nut model. Every two adjacent short columns 32 and tall columns 31 form a group, with a horizontal column 23 fixed between them. This horizontal column 23 is used to fix the manual hydraulic pump 69.

[0041] The support ring 21 is fixedly connected to the inner ring of the slewing bearing 22, and the support ring 21 and the slewing bearing 22 share a central axis. The hub 11 is hoisted onto the upper surface of the support ring 21. Based on the hole distribution and structural characteristics of the hub flange plate 14 and the reinforcing plate lug 15, the rotation angle between any two adjacent flange plates 14 or adjacent lugs 15 is 60°, and the gap allows for the passage of the other. (See reference...) Figure 10 Therefore, when hoisting the hub 11, the hub flange plate 14 can fall using the gap between the reinforcing plate lug 15, and the lug 15 can pass through the gap between the flange plate 14, so that the hub 11 and the reinforcing plate do not interfere with each other, and thus the final horizontal height of the hub 11 can be positioned between the horizontal heights of the two reinforcing plates.

[0042] Three hub guide pins 42 are evenly arranged on the upper side of the support ring 21. These hub guide pins 42 mate with the flange fixing holes of the hub. Their function is to guide the hub 11 in advance when it is hoisted onto the upper surface of the support ring 21, preventing interference between the hub 11 and the two reinforcing plates. Multiple flange fixing holes are evenly distributed around the edge of the flange surface. To clarify the mating relationship between the hub guide pins 42 and specific flange fixing holes, and to prevent interference between the hub flange plate 14 and the reinforcing plate lugs 15, in this application embodiment, a mark is drawn near at least one flange fixing hole intended to mate with the hub guide pins 42, and manual positioning is used during the hoisting of the hub 11. The positioning holes for the reinforcing plate lugs 15 and reinforcing plate guide pins 41, as well as the positioning holes for the hub flange surface and hub guide pins 42, must be correct. Using incorrect positioning holes will cause interference between the hub 11 and the reinforcing plate.

[0043] The hub guide pin 42 is arranged longitudinally and has a telescopic design, which can be compressed as the hub 11 descends. The hub flange surface for mounting the two reinforcing plates rests on the upper surface of the support ring 21. A PEHD gasket is fixed on the contact surface between the support ring 21 and the hub 11. The PEHD gasket can prevent damage to the hub flange surface.

[0044] The positioning and fastening device also includes a geared motor 25, which is fixed relative to the column. A gear 27 is coaxially fixed to the output end of the geared motor 25. The gear 27 meshes with the inner ring of the slewing bearing 22. The geared motor 25 drives the inner ring of the slewing bearing 22 to rotate, thereby causing the hub 11 to rotate synchronously around the inner circumference of the hub flange surface. In this application embodiment, the geared motor 25 is fixed to the horizontal column 23, which facilitates the coordination of the geared motor 25, the gear 27, and the inner ring of the slewing bearing 22.

[0045] This equipment is equipped with three automatic positioning points, spaced at 30°, 60°, and 90° intervals respectively. Their corresponding meanings to the inner ring movement of the slewing bearing 22 are as follows:

[0046] The first rotation is 30° (for example: Figure 10 (From line a to line b): Rotate 30° from the initial position to align the mounting holes of the hub flange plate 14 with the mounting holes of the reinforcing plate lug 15;

[0047] The second rotation is 30° (for example:) Figure 10 (From line b to line c): Rotate 60° in the same direction from the position after the first rotation, with the aim of moving the mounting hole above the original high column 31 to above the short column 32;

[0048] The third rotation is 90° (for example:) Figure 10(From line c to line a): Rotate 90° in the opposite direction from the position after the second rotation, with the aim of returning the inner ring of the slewing bearing 22 to its initial position.

[0049] In this application embodiment, the initial positions of the inner ring of the slewing bearing 22 and the support ring 21 are identified and determined by a proximity switch 8. The proximity switch 8 is fixed to the column, and a sensor head that the proximity switch 8 can identify is fixed at a location on the lower side of the inner ring of the slewing bearing 22. (See reference...) Figure 3 .

[0050] To coordinate with the geared motor 25 to drive the wheel hub 11 and monitor the status of the hydraulic cylinder and the reinforcing plate guide pin 41, the positioning and fastening equipment is also equipped with a control system. This control system is implemented through the control cabinet 7, remote control handle and HMI home screen, and is equipped with the above three automatic positioning points. The control cabinet 7 and remote control handle are electrically connected to the geared motor 25, laser sensor 9, and proximity switch 8. The control cabinet 7 is equipped with a main power switch, emergency stop button, power-on button, brake switch, reset button, first hydraulic cylinder 51 lifting button, first hydraulic cylinder 51 retraction button, second hydraulic cylinder 52 lifting button, second hydraulic cylinder 52 retraction button, forward rotation button, reverse rotation button, and HMI home screen. The remote control handle is equipped with the first hydraulic cylinder 51 lifting button, first hydraulic cylinder 51 retraction button, second hydraulic cylinder 52 lifting button, second hydraulic cylinder 52 retraction button, forward rotation button, and reverse rotation button. The HMI home screen displays the current status of the hydraulic cylinders and reinforcing plate guide pins 41. An upward arrow indicates that the hydraulic cylinder is in the extended state, and a downward arrow indicates that the hydraulic cylinder is in the retracted state. A lit dot indicates that the corresponding reinforcing plate positioning pin is in place; otherwise, it indicates that the guide pin has been removed.

[0051] To prevent accidental activation and ensure safe operation of the equipment, all actions must be performed simultaneously by the control cabinet 7 and the remote control handle. Two operators must be positioned on either side of the equipment, ensuring they can observe the vicinity of anyone to prevent the rotating hub 11 from injuring other personnel or damaging the equipment. The rotation speed and system time can be set on the HMI home screen, and the display language can be switched. The rotation speed setting range is 200-1400 r / min; the low-speed setting must not exceed the high-speed setting. A high-speed setting of 500 r / min and a low-speed setting of 250 r / min are recommended.

[0052] The positioning and fastening equipment controls the geared motor 25 to rotate the inner ring of the slewing bearing 22 through the control system, adjusts the position of the flange plate 14 of the hub 11, so that the mounting hole of the flange plate 14 corresponds to the mounting hole of the lug 15, and after the hole positions are aligned, the nut clamp is used to clamp the nut below the corresponding hole position, and then the bolt is tightened.

[0053] Based on the aforementioned positioning and fastening device for the wind turbine hub and reinforcing plate, a method for positioning and fastening the wind turbine hub and reinforcing plate is provided, comprising the following steps:

[0054] Step S1: Hoist the lower reinforcing plate. Use the guide pin at the top of the high column to guide the lower reinforcing plate and place it on top of the second hydraulic cylinder. Clamp the first hydraulic cylinder to the placed lower reinforcing plate using a quick clamp. When fixing the first hydraulic cylinder, it should be as close as possible to the second hydraulic cylinder to reduce elastic deformation of the reinforcing plate during subsequent operations and make installation smoother. See the diagram for the completed operation. Figure 7 .

[0055] Step S2: Hoist the upper reinforcing plate. Use the guide pin at the top of the high column to guide the upper reinforcing plate and place it on the upper side of the first hydraulic cylinder. See the diagram for the completed operation. Figure 8 .

[0056] Step S3: Hoist the wheel hub and guide it onto the upper side of the support ring using the wheel hub guide pin. See the diagram for the completed operation. Figure 9 and Figure 10 .

[0057] Step S4: Control the first hydraulic cylinder to lift and the second hydraulic cylinder to retract, adjust the horizontal height of the upper and lower reinforcing plates so that the upper and lower reinforcing plates do not obstruct the rotation of the wheel hub; rotate the inner ring of the slewing bearing by the geared motor to drive the wheel hub to rotate, so that the mounting holes of the wheel hub flange plate and the reinforcing plate lugs correspond.

[0058] Step S5: Control the first hydraulic cylinder to retract and the second hydraulic cylinder to lift, so that the upper and lower reinforcing plates are close to the wheel hub: the upper reinforcing plate is placed on the upper side of the wheel hub and the lower reinforcing plate is close to the lower side of the wheel hub.

[0059] Step S6: Open the quick clamp and remove the first hydraulic cylinder.

[0060] Step S7: Use the nut positioning device to clamp the nut, raise the nut clamp with the nut already clamped and place it close to the lower side of the lower reinforcing plate, and manually use an electric gun to tighten the bolts on the short column above the upper reinforcing plate.

[0061] Step S8: Lower the nut clamp and rotate the hub via the geared motor to rotate the mounting hole of the un-installed bolt to above the short column.

[0062] Step S9: Repeat step S7 to install all the corresponding mounting holes of the upper reinforcing plate, wheel hub, and lower reinforcing plate.

[0063] Step S10: Lift the assembled wheel hub and reset the slewing bearing.

[0064] Based on the above steps, before performing step S3, it is necessary to check whether the support ring is in the correct position. This correct position is the initial position of the inner ring of the slewing bearing. Simultaneously, the hub should be slowly placed onto the support ring to minimize impact on the equipment. After performing step S3, the operator needs to enter the hub and insert a sliding rod at the top of the three reinforcing plate guide pins. The operator then uses the sliding rod to rotate and remove the reinforcing plate guide pins. A detailed example of the hub rotation and subsequent steps is as follows:

[0065] 1) Check via the HMI home screen to see if all reinforcing plate guide pins have been removed;

[0066] 2) Simultaneously operate the remote control handle and the "First Hydraulic Cylinder Lifting" button on the control cabinet to lift the upper reinforcing plate;

[0067] 3) Enter the equipment and check if there are any foreign objects obstructing the slewing bearing and support ring. Also check if there is sufficient clearance between the upper and lower reinforcing plates and the hub.

[0068] 4) One operator operates the equipment at the electrical control cabinet, while another operator uses a remote control to operate the equipment from the other side, ensuring that the rotation of the hub will not cause harm to other personnel or equipment;

[0069] 5) Open the brake of the geared motor by turning the knob on the control cabinet panel;

[0070] 6) Both operators simultaneously press and hold the "Reverse" button on the control cabinet and remote control handle;

[0071] 7) The hub will initially rotate at high speed, then automatically slow down before reaching its destination, and stop automatically upon reaching the destination. Release the button. The device will then automatically stop after rotating 30° clockwise (viewed from above). See [link / reference]. Figure 10 Rotate line a to line b; at this point, the mounting holes of the wheel hub are aligned with the mounting holes of the reinforcing plate.

[0072] 8) Turn off the brake of the geared motor using the "Brake Control" knob;

[0073] 9) Simultaneously operate the remote control handle and the "First Hydraulic Cylinder Retraction" button on the control cabinet to place the upper reinforcing plate on the wheel hub, and then simultaneously operate the "Second Hydraulic Cylinder Lifting" button to lift the lower reinforcing plate so that it is close to the wheel hub.

[0074] 10) Open the quick clamp, remove the first hydraulic cylinder, and store it on the special bracket;

[0075] 11) At this point, the bolts directly above the short column can be installed;

[0076] 12) Open the brake on the geared motor, simultaneously operate the remote control handle and the "Reverse" button on the control cabinet, and hold them. The equipment will rotate 60° clockwise again and then stop automatically. Then release the buttons. (Refer to...) Figure 10 The middle line b rotates to the position of line c;

[0077] 13) Turn off the brake of the geared motor using the "Brake Control" knob;

[0078] 14) At this point, the remaining unsecured mounting holes have been moved to the top of the short column, and the remaining bolts can be installed;

[0079] 15) After all bolts are assembled, the wheel hub can be lifted and proceed to the next production process;

[0080] 16) Simultaneously operate the remote control handle and the "forward" button on the control cabinet, and hold them. The equipment will rotate 90° counterclockwise and then stop automatically. Then release the button, and the support ring will return to its initial position.

[0081] 17) Reattach the reinforcing plate guide pin to the equipment, at which point the equipment is ready to receive the next wheel hub.

[0082] Based on the above structure and method, the application embodiments of this utility model have the following beneficial effects:

[0083] 1. The equipment guides the wheel hub and upper and lower reinforcing plates to be accurately hoisted into place by means of the retractable wheel hub guide pin on the support ring and the detachable reinforcing plate guide pin on the top of the high column. With the help of the geared motor driving the inner ring of the slewing bearing to rotate, the wheel hub flange plate and the reinforcing plate lug mounting hole positions can be quickly aligned without repeated manual fine-tuning. The core hole alignment efficiency is significantly improved, and the process time is greatly shortened.

[0084] 2. The nut positioning device at the top of the short column, through the height adjustment of the lifting platform and the opening and closing of the nut clamp driven by the horizontal hydraulic cylinder, can automatically push the nut below the installation hole and reliably clamp it, avoiding the nut from rotating when the electric gun tightens the bolt; the operator only needs to work with the electric gun above the upper reinforcing plate, without having to manually bear the large torque, which reduces manpower consumption, avoids safety risks, and ensures stable bolt tightening torque, thus improving connection reliability.

[0085] 3. The equipment columns are divided into short columns and tall columns. The hydraulic cylinders, nut clamps, guide pins and other components are all designed to be detachable or adjustable (such as quick clamps to fix the first hydraulic cylinder, and clamps that can be replaced to fit different nuts). It can adapt to the assembly needs of most types of wheel hubs, without the need to frequently adjust the operation mode for different wheel hubs, reducing process complexity and cost, and meeting the needs of large-scale production.

[0086] 4. The equipment is equipped with laser sensors to detect the status of hydraulic cylinders, proximity switches to confirm the positioning of guide pins, and dual operation permissions (requiring two people to operate together) combined with the control cabinet and remote control handle, as well as the HMI home screen to display the equipment status in real time, which can effectively prevent accidental touches and operational risks; the inner ring of the slewing bearing has a preset automatic positioning point, and the high and low speeds can be automatically switched during the rotation process, further improving the convenience and safety of operation.

[0087] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A nut positioning device, characterized in that, It includes a nut clamp and a transverse hydraulic cylinder; the nut clamp is installed below the hole where the bolt needs to be assembled, and includes a reference side and a clamping side; the transverse hydraulic cylinder moves the clamping side, thereby opening and closing the nut clamp to clamp the nut.

2. The nut positioning device according to claim 1, characterized in that, The reference side and the clamping side are combined to form multiple nut grooves, and the arc of the arrangement of the nut grooves is the same as that of the corresponding assembly holes; the reference side is fixed relative to the transverse hydraulic cylinder, and the clamping side is fixed to the piston rod of the transverse hydraulic cylinder.

3. The nut positioning device according to claim 2, characterized in that, It also includes a lifting frame and a lifting machine, wherein the transverse hydraulic cylinder and the nut clamp are fixed to the lifting frame, and the lifting machine is used to lift the lifting frame.

4. The nut positioning device according to claim 3, characterized in that, The lifting frame includes an upper platform and a lower platform. The nut clamp is disposed on the upper platform, and the transverse hydraulic cylinder is disposed on the lower platform. The reference side is fixed to the upper platform, and a slider is fixed at the bottom of the clamping side. The slider passes through the upper platform and is fixed to the piston rod of the transverse hydraulic cylinder. The upper platform has a slot for the slider to move laterally.

5. The nut positioning device according to claim 4, characterized in that, The upper platform is also provided with two fixed pressure blocks, which are located at both ends of the nut clamp respectively; a groove is formed between the fixed pressure block and the upper platform, and the shape of the groove matches the two ends of the clamping side to guide the lateral movement of the clamping side.

6. The nut positioning device according to claim 3, characterized in that, The elevator is fixed to a mounting frame, and its output end moves longitudinally. The lifting frame is fixed to the output end of the elevator. Longitudinal guide rods are provided on both sides of the mounting frame. Linear bearings are connected to both sides of the lifting frame, and the linear bearings cooperate with the guide rods.

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