Large bolt upending device and upending method in narrow space

Abstract

A device and method for installing large bolts in confined spaces includes a rotor with a nut placement slot adapted to the shape of a nut. The rotor is mounted on a stator, which consists of an axially upward coil, an axially downward coil, a radially suspended coil, and a rotary drive coil. The stator and rotor together form a suspended thrust bearing, a radial guide bearing, and a rotary motor. This invention solves the problems of time-consuming, labor-intensive, and low-success-rate installation of large bolts in confined spaces.

Description

Technical Field

[0001] This invention belongs to the field of large bolt inversion installation technology, and specifically relates to a large bolt inversion device and method in a confined space. Background Technology

[0002] During the overhaul of large hydro-generator units, the runner is turned over for maintenance. The turning tools, runner handles, and bolts are M160×380, weighing 77kg, and are installed upside down. Due to limitations of the lifting equipment and the confined space, manually installing the bolts is extremely difficult, easily causing the bolts to tip over and injure workers, resulting in a low success rate and significant time consumption. Therefore, it is necessary to invent a large bolt inversion device for confined spaces to solve the above problems when installing bolts upside down in confined spaces, thereby improving installation efficiency and safety. Summary of the Invention

[0003] In view of the technical problems existing in the background art, the large bolt inversion device and inversion method in confined spaces provided by the present invention solves the problems of time-consuming, labor-intensive and low success rate of installing large bolts in confined spaces.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A large bolt inversion device for confined spaces includes a rotor with a nut placement slot that is shaped to fit a nut. The rotor is mounted on a stator, which consists of an axial upper coil, an axial lower coil, a radial suspension coil, and a rotary drive coil. The stator and rotor together form a suspension thrust bearing, a radial guide bearing, and a rotary motor.

[0006] In a preferred embodiment, the stator is mounted on a guide rail on a support plate; the stator is provided with a threaded hole, which, in conjunction with the screw thread, forms an X-axis threaded pair, and the screw is rotatably mounted on the support plate.

[0007] In a preferred embodiment, the support plate is slidably mounted on the fixed plate, and the support plate is driven to move on the fixed plate by a Y-axis threaded pair.

[0008] In a preferred embodiment, the bottom of the fixing plate is provided with multiple hydraulic jacks.

[0009] In a preferred embodiment, the telescopic rod of the hydraulic jack is hinged to the fixed plate.

[0010] In the preferred embodiment, the hydraulic jack is mounted on a trolley, and the trolley is mounted on heavy-duty casters.

[0011] In a preferred embodiment, the stator is equipped with multiple vision sensors, which are electrically connected to an integrated controller. The integrated controller consists of a metering pump, a suspension controller, and a touch screen. The integrated controller is used to realize axial thrust bearing suspension control, radial guide bearing suspension control, and drive rotor rotation control, as well as to realize hydraulic jack control and visual display.

[0012] A method for installing a large bolt inversion device in a confined space includes the following steps:

[0013] Step 1: Use a trolley to transport the bolts to be installed to the work position and perform rough alignment of the bolts;

[0014] Step 2: Use the X-axis thread pair and Y-axis thread pair to precisely align the bolts to be installed;

[0015] Step 3: Use the integrated controller to control the rotary motor to rotate the rotor in the forward direction, and the bolts will gradually be screwed into the bolt holes;

[0016] Step 4: The integrated controller continuously adjusts the suspension control based on sensor data. The operator increases or decreases the rotation current according to the rotation status, and the metering pump adds a metered amount of oil to increase the jack height based on the number of rotations.

[0017] The present invention can achieve the following beneficial effects:

[0018] This invention can solve the problems of difficulty in centering, lifting, and mismatch between lifting force and rotation when installing large and heavy bolts upside down; it can achieve flexible installation of large and heavy bolts upside down, ensuring that the bolts and their mounting hole threads are not damaged by violent installation; this device can save two bolt installation personnel, eliminating the need for high-intensity physical labor, and efficiently completing the upside-down installation of M160 bolts. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 This is a structural diagram of a large bolt inversion device installed in a confined space.

[0021] In the diagram: 1. Large bolt; 2. Vision sensor; 3. Axial upward coil; 4. Radial suspension coil; 5. Rotary drive coil; 6. Axial downward coil; 7. Guide rail; 8. Y-axis threaded pair; 9. Trolley; 10. Rotor; 11. Stator; 12. Support plate; 13. Fixing plate; 14. Hydraulic jack; 15. Heavy-duty caster wheel; 16. Threaded hole; 17. Integrated controller. Detailed Implementation

[0022] Preferred solutions include Figure 1As shown, a large bolt inversion device for confined spaces includes a rotor 10 with a nut placement slot adapted to the shape of a nut. The rotor 10 is mounted on a stator 11, which consists of an upward axial coil 3, a downward axial coil 6, a radial suspension coil 4, and a rotary drive coil 5. The stator 11 and rotor 10 together form a levitation thrust bearing, a radial guide bearing, and a rotary motor. The upward axial coil 3, downward axial coil 6, and radial suspension coil 4 suspend the rotor 10, while the rotary drive coil 5 drives the rotor 10 to rotate. The rotor 10 is analogous to the rotor of an electric motor, and the rotary drive coil 5 is analogous to the stator coil of an electric motor.

[0023] The stator 11 is mounted on guide rails 7 on the support plate 12, and there are two guide rails 7. The stator 11 is provided with threaded holes 16, which engage with the screw to form an X-axis threaded pair. The screw is rotatably mounted on the support plate 12. The support plate 12 is slidably mounted on the fixed plate 13, and the support plate 12 is driven to move on the fixed plate 13 by a Y-axis threaded pair 8. The X-axis threaded pair and the Y-axis threaded pair 8 are used to adjust the orientation of the stator 11 in the horizontal plane.

[0024] Multiple hydraulic jacks 14 are provided at the bottom of the fixed plate 13. The telescopic rods of the hydraulic jacks 14 are hinged to the fixed plate 13. The hydraulic jacks 14 are mounted on the trolley 9, and the trolley 9 is mounted on the heavy-duty casters 15. There are four hydraulic jacks 14 in total. The four hydraulic jacks 14 can not only control the height of the stator 11, but also adjust the level of the stator 11.

[0025] Furthermore, the stator 11 is equipped with multiple vision sensors 2, which are electrically connected to the integrated controller 17. The integrated controller 17 consists of a metering pump, a suspension controller, and a touch screen. The integrated controller 17 is used to realize the suspension control of the axial thrust bearing, the suspension control of the radial guide bearing, and the rotation control of the drive rotor, as well as to realize the control and visual display of the hydraulic jack 14.

[0026] The method for installing a large bolt inverted device in a confined space includes the following steps:

[0027] Step 1: Use a trolley to transport the bolts to be installed to the work position and perform rough alignment of the bolts;

[0028] Step 2: Use the X-axis thread pair and Y-axis thread pair to precisely align the bolts to be installed;

[0029] Step 3: Use the integrated controller to control the rotary motor to rotate the rotor in the forward direction, and the bolts will gradually be screwed into the bolt holes;

[0030] Step 4: The integrated controller continuously adjusts the suspension control based on sensor data. The operator increases or decreases the rotation current according to the rotation status, and the metering pump adds a metered amount of oil to increase the jack height based on the number of rotations.

[0031] Example 1:

[0032] M160×380 bolt 1 is placed upside down in the middle of the rotor 10 of the device. The rotor 10 has a groove in the middle, the same size as the hexagonal head of the M160×380 bolt 1, with a gap of less than 0.15mm between the groove and the bolt head, allowing for bolt fixation. The rotor 10 is disc-shaped. The stator 11 of the device consists of an axially upward coil 3, an axially downward coil 6, a radially suspended coil 4, and a rotary drive coil 5. The rotor and stator of the device form a suspended thrust bearing and a suspended guide bearing, also constituting a bolt-mounted rotary motor. The lower part of the stator 11 is fixed to the guide rail 7, allowing for linear movement perpendicular to the plane of the paper in the diagram, achieved by rotating the threaded joint through the screw screw inserted into the threaded hole 16. The lower part of the guide rail 7 is fixedly connected to the support plate 12. The fixed plate 12 and the fixed plate 13 are connected via the guide rail. The fixed plate 12 moves linearly left and right relative to the fixed plate 13 in the diagram, achieved by the threaded joint 8. The threaded joint serves both a moving and locking function, preventing automatic relative slippage. The fixed plate 13 is hinged to four large-stroke hydraulic jacks 14. The large-stroke hydraulic jacks serve three functions: first, they can lift the M160×380 bolt 1 to the mounting bolt hole attachment; second, they adjust the parallelism between the M160×380 bolt 1 and the mounting hole axis; and third, they compensate for insufficient axial clearance of the suspension thrust bearing during the rotational installation of the M160×380 bolt 1. The large-stroke hydraulic jacks 14 are fixedly installed to the trolley 9. Heavy-duty casters 15 are installed under the trolley 9, and these casters 15 have a locking function, locking after rough alignment to prevent the trolley from sliding. The trolley 9 transports the M160×380 bolt 1 from its storage position to directly below the bolt installation position, using the casters 15 to roughly align the M160×380 bolt 1 with its mounting hole. Four vision sensors 2 are installed on the stator. The vision sensors 2 output images to the integrated controller 17 of the device, facilitating observation of the alignment of the M160×380 bolt 1 with its mounting hole. The integrated controller 17 consists of a metering pump, a suspension controller, and a touch screen, and has functions such as rotor axial thrust bearing suspension control, radial guide bearing suspension control, driving rotor rotation, lifting with large stroke hydraulic jack 14, and visual display.

[0033] After the trolley 9 roughly aligns the M160×380 bolt 1 with its mounting hole, the threaded pair 8 and the threaded hole 16 drive the relative movement of the fixing plate 12 and the stator 11 respectively, precisely adjusting and aligning the M160×380 bolt 1 with its mounting hole. After alignment, the integrated controller, based on set parameters such as the bolt size, relative friction coefficient, thread pitch, and bolt material of the M160×380 bolt 1, activates the forward rotation button to gradually screw the bolt into the bolt hole. During rotation, the integrated controller 17 continuously adjusts the suspension control through sensor data. The operator increases or decreases the rotation current according to the rotation status, and the metering pump quantitatively replenishes oil to the large-stroke hydraulic jack 14 according to the number of rotations to increase the jack height and compensate for the height of the M160×380 bolt 1 as it is screwed into its mounting hole.

[0034] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A large bolt inversion device for use in confined spaces, characterized in that: Includes a rotor (10), which has a nut placement groove with a shape that matches the nut. The rotor (10) is mounted on a stator (11), which is composed of an axial upper coil (3), an axial lower coil (6), a radial suspension coil (4), and a rotary drive coil (5). The stator (11) and the rotor (10) together form a suspension thrust bearing, a radial guide bearing, and a rotary motor. The support plate (12) is slidably mounted on the fixed plate (13), and the support plate (12) is driven to move on the fixed plate (13) by the Y-axis threaded pair (8); Multiple hydraulic jacks (14) are provided at the bottom of the fixed plate (13); The stator (11) is equipped with multiple vision sensors (2), which are electrically connected to the integrated controller (17). The integrated controller (17) consists of a metering pump, a suspension controller and a touch screen. The integrated controller (17) is used to realize the axial thrust bearing suspension control, the radial guide bearing suspension control and the drive rotor rotation control, as well as to realize the hydraulic jack (14) control and visual display.

2. The large bolt inversion device in a confined space according to claim 1, characterized in that: The stator (11) is mounted on the guide rail (7) on the support plate (12); the stator (11) is provided with a threaded hole (16), which is threaded with the screw to form an X-axis threaded pair, and the screw is rotatably mounted on the support plate (12).

3. The large bolt inversion device in a confined space according to claim 1, characterized in that: The telescopic rod of the hydraulic jack (14) is hinged to the fixed plate (13).

4. The large bolt inversion device in a confined space according to claim 3, characterized in that: The hydraulic jack (14) is mounted on the trolley (9), and the trolley (9) is mounted on the heavy-duty caster (15).

5. The method for inverting a large bolt inverting device in a confined space according to claim 4, characterized in that... Includes the following steps: Step 1: Use a trolley to transport the bolts to be installed to the work position and perform rough alignment of the bolts; Step 2: Use the X-axis thread pair and Y-axis thread pair to precisely align the bolts to be installed; Step 3: Use the integrated controller to control the rotary motor to rotate the rotor in the forward direction, and the bolts will gradually be screwed into the bolt holes; Step 4: The integrated controller continuously adjusts the suspension control based on sensor data. The operator increases or decreases the rotation current according to the rotation status, and the metering pump adds a metered amount of oil to increase the jack height based on the number of rotations.

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