A marine boring device capable of automatically correcting trajectory

Abstract

A marine boring device capable of automatically correcting its trajectory, wherein the two ends of the boring bar are fixed to the device body via a front-end bearing and a rear-end bearing, respectively; a deflection laser receiver is fixed above the bearing seat of the rear-end bearing; a deflection laser transmitter is fixed at a position on the boring tool shank corresponding to the deflection laser receiver; and a corrector is fixed below the bearing seat of the rear-end bearing. The deflection laser transmitter and the deflection laser receiver are used in conjunction to generate a signal indicating whether deflection has occurred and send it to the corrector. After the corrector performs calculations and processing, the calculated deflection value and correction direction are sent to an actuator, which adjusts the boring bar. The present invention successfully solves the problem of the traditional equipment affecting the machining accuracy of the inner hole of the stern tube due to the downward deflection of the boring bar due to its own gravity, greatly improves the machining accuracy of the boring equipment, ensures the smooth interference fit of the bearing, reduces the risk of bearing fit during ship construction, and reduces the ship's construction period and construction cost.

Description

Technical Field

[0001] The invention relates to the field of ship stern tube boring processing, and in particular to a ship boring device capable of automatically correcting a working trajectory of a boring tool during the boring process. Background Art

[0002] With the rapid development of science and technology, especially in today's globalized world, shipbuilding is gradually moving towards larger tonnage, deeper draft, and lower rigidity. Therefore, shafting assembly to prevent high temperatures in bearings is particularly important during shipbuilding. Stern tube boring is a key step in shafting installation, and its importance is self-evident.

[0003] However, traditional stern tube boring equipment has the following two disadvantages:

[0004] 1. Two-end support processing equipment: This equipment has its own support at both ends. The tool processes the stern tube by rotating on the boring bar. The horizontally placed boring bar produces downward deflection due to its own gravity. Therefore, the inner hole of the stern tube after processing will inevitably produce a certain amount of downward deflection. The downward deflection is as follows: Figure 1 shown.

[0005] 2. Three-point support processing equipment: In addition to the supports at both ends, this equipment adds a temporary support in the middle. The horizontally placed boring hole also produces downward deflection due to its own gravity, but because there is a support in the middle, the maximum deflection is reduced, but there is still a certain deflection. The downward deflection is as follows Figure 2 shown.

[0006] For large VLCCs with stern tubes exceeding 1000mm in diameter and 2000mm in length, machining with two-end support equipment can result in a deflection of approximately 0.15mm in the stern tube inner bore, while machining with three-point support equipment can result in a deflection of approximately 0.08mm. Regardless of the type of equipment used, this deflection poses a significant risk to press-fitting bearings with an interference fit of only 0.01mm to 0.03mm. Summary of the Invention

[0007] In order to solve the above problems, the present invention provides a marine boring device that can automatically correct the trajectory, aiming to achieve the purpose of automatically correcting the working trajectory of the boring tool and the boring bar during the working process to avoid deflection. The technical solution adopted is:

[0008] A marine boring device with automatic trajectory correction consists of a device body and a boring bar. A lead screw is mounted above the boring bar, onto which a boring cutter is mounted. The boring cutter has a nut with external threads that mesh with the lead screw. The boring bar is secured to the device body at both ends via front and rear bearings, respectively. A deflection laser receiver is secured above the bearing seat of the rear bearing. A deflection laser transmitter is secured to the boring cutter shank at a position corresponding to the deflection laser receiver. A corrector is secured below the bearing seat of the rear bearing. The deflection laser receiver and the deflection laser transmitter operate in conjunction. If the deflection laser receiver fails to receive laser light from the transmitter during operation, the boring cutter and boring bar are considered to have deviated from their intended trajectory. If the receiver receives laser light from the transmitter, the boring cutter and boring bar are considered to be operating normally. The deflection laser receiver then sends a signal to the corrector.

[0009] The deflection laser transmitter and deflection laser receiver are used together to generate a deflection signal and send it to the corrector. After the corrector performs calculations, it sends the calculated deflection value and correction direction to the actuator. After the corrector receives the deviation signal from the established track, it calculates the deviation value. The calculation formula is as follows:

[0010]

[0011] in:

[0012] v: boring bar deflection

[0013] P: boring tool weight

[0014] l: The distance between the front bearing and the rear bearing

[0015] x: distance between boring tool and rear end bearing

[0016] E: Boring bar elastic modulus

[0017] I: Moment of inertia of the boring bar cross section

[0018] Q: Weight of the boring bar at length l

[0019] The corrector calculates the deviation value (i.e., the deflection value) and the deviation direction, and sends this signal to the actuator for execution.

[0020] The actuator, located within the front bearing, is an adjustment screw assembly located between the front bearing and the boring bar. An adjustment screw is located above, below, left, and right of the boring bar, each with its own adjustment motor. The actuator also has a receiver that receives signals from the corrector and uses the motor to drive the adjustment screws to adjust the boring bar.

[0021] The above-mentioned marine boring equipment that can automatically correct the trajectory, further, has a shift gear fixed at one end of the boring rod near the rear end bearing, the shift gear is coaxially connected to the fixed gear, a screw gear is fixed at the end of the screw, the screw gear is coaxially connected to the movable gear, and the movable gear is engaged with the shift gear teeth.

[0022] The above-mentioned marine boring equipment capable of automatically correcting the trajectory further comprises the following steps: after the corrector measures the distance between the rear end bearing and the boring cutter, it is brought into the deflection calculation formula to calculate the deflection value and the correction direction and send them to the actuator.

[0023] The above-mentioned marine boring equipment that can automatically correct the trajectory, further, is provided with a feed box near the rear end bearing of the boring equipment, and the movable gear, fixed gear, shift gear, and screw gear are fixed in the feed box, and the movable gear and screw gear are located above the fixed gear and shift gear.

[0024] The above-mentioned marine boring equipment capable of automatically correcting a trajectory is further characterized in that the fixed gear is connected to a motor.

[0025] The above-mentioned marine boring equipment capable of automatically correcting the trajectory can be further characterized in that the actuator is provided with a signal receiver for receiving the signal sent by the corrector.

[0026] The above-mentioned marine boring equipment capable of automatically correcting the trajectory can be further characterized in that the front end bearing is fixed to the equipment body via a front fixing frame.

[0027] The above-mentioned marine boring equipment capable of automatically correcting the trajectory can be further characterized in that the rear end bearing is fixed to the equipment body through a rear fixing frame.

[0028] The present invention can monitor the horizontality of the boring bar axis in real time, automatically adjust the height and direction of the boring bar, avoid the downward deflection of the boring bar due to its own gravity, solve the influence of the downward deflection of the boring bar due to its own gravity on the processing accuracy of the stern tube inner hole in traditional equipment, greatly improve the processing accuracy of the boring equipment, ensure the smooth progress of the bearing interference press fitting, reduce the risk of bearing press fitting during ship construction, and reduce the construction period and construction cost of the ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is the deflection diagram of the supports at both ends of the boring equipment;

[0030] Figure 2 It is the three-point support deflection diagram of the boring equipment;

[0031] Figure 3 It is a schematic diagram of the calculation formula;

[0032] Figure 4 It is a structural schematic diagram of the boring equipment of the present invention;

[0033] Figure 5 It is a structural diagram of the actuator;

[0034] Among them: 1-boring bar, 2-lead screw, 3-boring tool, 4-nut, 5-front end bearing, 6-rear end bearing, 7-deflection laser receiver, 8-deflection laser transmitter, 9-corrector, 10-adjustment screw, 11-adjustment motor, 12-feed box. DETAILED DESCRIPTION

[0035] The present invention will be further described with reference to the accompanying drawings.

[0036] like Figure 4 As shown, a marine boring device capable of automatically correcting a trajectory comprises a device body and a boring bar. Both ends of the boring bar are fixed to the device body through a front end bearing and a rear end bearing respectively. A boring cutter is sleeved on the boring bar. A lead screw is provided above the boring bar. The boring cutter has a nut. The outer surface of the nut is provided with an external thread. The external thread of the nut engages with the teeth of the lead screw.

[0037] A feed box is located near the rear bearing at one end of the boring bar. Inside the feed box is a gear mechanism with a fixed gear, which is fixed to the feed box body. The fixed gear is coaxial with the shift gear, which is connected to the end of the boring bar. The shift gear meshes with the teeth of the movable gear, which is coaxial with the lead screw gear, which is fixed to the end of the lead screw. The rotation of the fixed gear drives the shift gear (i.e., the boring bar), which in turn drives the movable gear and lead screw gear, which in turn drives the lead screw. The lead screw meshes with the teeth of the nut, and the rotation of the lead screw drives the boring tool forward along the boring bar.

[0038] A deflection laser receiver is fixed above the rear-end bearing. A deflection laser transmitter is installed at the position corresponding to the boring tool and the deflection laser receiver. The deflection laser transmitter transmits laser light to the deflection laser receiver. If the deflection laser receiver does not receive the laser signal, it sends a signal to the corrector indicating that no laser light has been received. After receiving the signal, the corrector performs calculations and sends the results to the actuator, which adjusts the boring bar. The rear-end bearing is fixed to the main body of the equipment via the rear fixing bracket, and the front-end bearing is fixed to the main body of the equipment via the front fixing bracket.

[0039] like Figure 3 As shown, the calculation formula is:

[0040]

[0041] in:

[0042] v: boring bar deflection

[0043] P: boring tool weight

[0044] l: The distance between the front bearing and the rear bearing

[0045] x: distance between boring tool and rear end bearing

[0046] E: Boring bar elastic modulus

[0047] I: Moment of inertia of the boring bar cross section

[0048] Q: Weight of the boring bar at length l

[0049] like Figure 5 As shown, the actuator is an adjustment screw assembly. An adjustment screw is located between the boring bar and the front bearing, and on the top, bottom, left, and right sides of the boring bar. Each adjustment screw has an adjustment motor. Upon receiving an adjustment signal, the actuator issues a command to the different adjustment motors, which then drive the adjustment screws. The adjustment screws exert a force on the boring bar, adjusting it in the direction of the applied force. This in turn adjusts the bar's centerline to a horizontal position, ensuring the boring cutter returns to its intended trajectory.

[0050] The marine boring equipment of the present invention, which can automatically correct the trajectory of the boring bar, successfully solves the problem of the influence of the boring bar's own gravity deflection on the processing accuracy of the stern tube inner hole in traditional equipment, greatly improves the processing accuracy of the boring equipment, ensures the smooth progress of the bearing interference press fitting, reduces the risk of bearing press fitting during ship construction, and reduces the construction period and construction cost of the ship.

Claims

1. A marine boring device capable of automatically correcting a trajectory, comprising a device body and a boring bar (1), a lead screw (2) being provided above the boring bar, a boring tool (3) being sleeved on the boring bar, a nut (4) provided with an internal thread being engaged with teeth of the lead screw, and characterized in that: The two ends of the boring bar are fixed to the main body of the equipment through a front bearing (5) and a rear bearing (6), a deflection laser receiver (7) is fixed above the bearing seat of the rear bearing, a deflection laser transmitter (8) is fixed at a position corresponding to the deflection laser receiver on the boring tool handle, and a corrector (9) is fixed below the bearing seat of the rear bearing; the boring tool automatically corrects the working trajectory during the boring process; The deflection laser transmitter and the deflection laser receiver are used together to generate a deflection signal which is sent to the corrector. After the corrector performs calculations, it sends the calculated deflection value and correction direction to the actuator. The actuator is located in the front end bearing, and the actuator is an adjustment screw group. The adjustment screw group is located between the front end bearing and the boring bar. An adjustment screw (10) is provided on the top, bottom, left and right of the boring bar, and each adjustment screw is provided with an adjustment motor (11). A shift gear (14) is fixed to one end of the boring bar near the rear end bearing, the shift gear is coaxially connected to the fixed gear (13), a lead screw gear (16) is fixed to the end of the lead screw, the lead screw gear is coaxially connected to the movable gear (15), and the movable gear is meshed with the shift gear teeth; After the corrector measures the distance between the rear end bearing and the boring tool, it is put into the deflection calculation formula to calculate the deflection value and correction direction and send them to the actuator.

2. The marine boring equipment capable of automatically correcting the trajectory according to claim 1, characterized in that: A feed box (12) is provided near the rear end bearing of the boring device, wherein a movable gear, a fixed gear, a shift gear and a screw gear are fixed in the feed box, and the movable gear and the screw gear are located above the fixed gear and the shift gear.

3. A marine boring device capable of automatically correcting trajectory according to claim 1 or 2, characterized in that: The fixed gear is connected to a motor.

4. The marine boring equipment capable of automatically correcting trajectory according to claim 1, characterized in that: The actuator is provided with a signal receiver for receiving the signal from the corrector.

5. The marine boring equipment capable of automatically correcting the trajectory according to claim 1, characterized in that: The front end bearing is fixed to the equipment body through the front fixing bracket.

6. The marine boring equipment capable of automatically correcting trajectory according to claim 1, characterized in that: The rear end bearing is fixed to the equipment body through the rear fixing bracket.

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