Double-brake hydraulic manned winch with high safety

Abstract

The application discloses a double-brake hydraulic manned winch with high safety, which comprises a rack, a hydraulic motor, a planetary reducer, a drum body, a first brake, a second brake, a control valve group, a limiting device, an overload protection device and a rope slack protection device. The first brake is a multi-plate wet brake inside the reducer; the second brake is a normally closed clamp brake directly acting on the drum body; the two brakes are synchronously controlled by the control valve group; the limiting device comprises a hydraulic limiting valve triggered by the shaft head of the drum body, and the winch stops rotating when the limiting position is reached; the overload protection device is an overflow valve; the rope slack protection device comprises a hydraulic stroke switch. The control valve group is also provided with a bidirectional balance valve and a one-way valve, which are respectively used for preventing pipeline burst and cooperating with manual emergency release. The winch is driven by full hydraulic pressure, is intrinsically explosion-proof, and is suitable for occasions with inconvenient power supply and high explosion-proof requirements.

Description

Technical Field

[0001] This invention relates to the field of oil drilling equipment technology, specifically to a manned winch for oil drilling platforms, and more particularly to a highly safe dual-brake hydraulic manned winch, suitable for situations where gas or electricity supply is inconvenient (such as pure hydraulic drilling rigs), and for situations with extremely high explosion-proof requirements. Background Technology

[0002] On oil drilling platforms, personnel winches are critical equipment used to transport workers to the derrick for maintenance work, and their safety is directly related to personnel safety. Currently, the vast majority of personnel winches used on oil drilling platforms are pneumatic winches, with hydraulic personnel winches being extremely rare. Although pneumatic winches have advantages such as explosion-proof and stepless speed regulation, they have long suffered from poor low-temperature adaptability, low overload protection accuracy, and low transmission efficiency. In recent years, a few technologies have proposed hydraulically driven personnel winch solutions in an attempt to overcome the aforementioned shortcomings of pneumatic winches.

[0003] However, existing hydraulic manned winch solutions still have significant shortcomings when applied to oil drilling platforms:

[0004] First, the braking safety redundancy is insufficient and the structure poses risks.

[0005] According to the relevant regulations of the China Classification Society (CCS) and Det Norske Veritas (DNV), manned winches should be equipped with two independent braking systems, and at least one brake should be directly mounted on the drum side. One proposed configuration has dual brakes, with one brake transmitting braking force to the drum via a support shaft. This structure can achieve braking under normal operating conditions, but if the drive shaft breaks, the brake will be unable to transmit braking force to the drum, resulting in braking failure and a safety hazard. Directly applying the normally closed brake to the brake disc mounted on the drum body can avoid this risk; however, no existing designs demonstrate a technical solution for directly applying a normally closed caliper brake to a brake disc mounted on the drum body.

[0006] Second, the security protection functions are not systematically integrated.

[0007] Oil drilling rig personnel operation specifications require winches to have multiple safety protection functions, including overload protection, limit protection, slack rope protection, and emergency release. Existing hydraulic personnel winch solutions primarily focus on drive and basic braking functions. These safety protection functions are often missing or require additional independent devices, failing to form an organic whole with the winch's braking and hydraulic control systems. For example, overload protection often relies on external sensors and electrical control systems, limit protection uses independent electronically controlled limit switches, and slack rope protection and emergency release functions are often lacking. This fragmented and unintegrated solution makes it difficult to meet the high safety and reliability requirements of oil drilling rig personnel operations.

[0008] In view of the shortcomings of the existing technology, there is an urgent need in the field for a high-safety dual-brake hydraulic manned winch. It adopts a normally closed caliper brake that acts directly on the drum brake disc as the second brake, and integrates safety functions such as overload protection, limit protection, slack rope protection, and emergency release into a unified system controlled by a hydraulic control valve group, so as to meet the special requirements of manned operation of oil drilling rigs. Summary of the Invention

[0009] This invention addresses the shortcomings of existing technologies by providing a highly safe dual-brake hydraulic manned winch. It aims to meet the requirements of CCS, DNV, and other standards regarding "at least one set of brakes directly installed on the drum side," avoiding the risk of shaft breakage that exists when transmitting braking force through a drive shaft. At the same time, it integrates safety functions such as overload protection, limit protection, slack rope protection, and emergency release into a unified system controlled by a hydraulic control valve group.

[0010] To solve the above-mentioned technical problems, the present invention provides a highly safe dual-brake hydraulic manned winch.

[0011] As a preferred embodiment of the present invention, the hydraulic manned winch includes: a frame; a hydraulic motor; a planetary reducer connected to the hydraulic motor; a drum body, one end of which is connected to the output end of the planetary reducer, and the other end of which is connected to the frame via a support shaft assembly; a first brake, which is a multi-disc wet brake disposed at the output end of the hydraulic motor; a second brake, which is a normally closed caliper brake that acts directly on a brake disc mounted on the drum body; a control valve group for controlling the operation of the hydraulic motor, the first brake, and the second brake, wherein the first brake and the second brake are synchronously controlled by the control valve group; a limit device, including a hydraulic limit valve, which is driven and triggered by the shaft head of the drum body, and when the drum body rotates to the limit position, the hydraulic limit valve releases pressure to stop the hydraulic motor from rotating; an overload protection device, which is an overflow valve disposed in the control valve group, and when the load reaches the set load, the overflow valve opens to unload and stop the hydraulic motor from lifting; and a slack rope protection device, including a hydraulic limit switch, which sends a signal to stop the hydraulic motor from rotating when the wire rope is slack.

[0012] As a preferred embodiment of the present invention, the control valve group is further provided with a bidirectional balance valve, which is installed on both sides of the hydraulic motor oil line to prevent the load from falling uncontrollably when the pipeline bursts, and to prevent safety accidents caused by incorrect pipeline connection.

[0013] As a preferred embodiment of the present invention, the control valve group is further provided with a check valve for use in conjunction with the manual pump to achieve an emergency release function. When the main hydraulic system loses pressure or the winch malfunctions, resulting in personnel being trapped at height, an external manual pump can supply oil to the second brake via the check valve to forcibly open the brake. In conjunction with the throttle valve, the descent speed can be controlled to safely lower the personnel.

[0014] In a preferred embodiment of the present invention, the hydraulic limit valve is triggered by a worm gear or planetary reducer and cam mechanism driven by the drum shaft. When the drum rotates to its upper or lower limit position, the hydraulic limit valve actuates, releasing the pressure oil in the control oil circuit back to the oil tank, causing the pressure in the hydraulic motor's inlet circuit to drop, preventing it from continuing to drive the drum to rotate, thus achieving limit protection.

[0015] As a preferred embodiment of the present invention, the hydraulic motor is a low-speed, high-torque motor. Beneficial effects

[0016] The present invention has the following beneficial effects:

[0017] The second brake is a normally closed caliper brake that acts directly on the brake disc mounted on the drum body. It does not transmit braking force through the drive shaft, thus avoiding the risk of brake failure due to drive shaft breakage. This meets the requirements of CCS, DNV and other standards that "at least one brake should be directly installed on the drum side".

[0018] The two brakes are controlled synchronously by a control valve group, which avoids the problem of asynchrony when operating separately and ensures the coordination and reliability of braking.

[0019] The system integrates overload protection, limit protection, slack rope protection, and emergency release into a unified and coordinated system controlled by a hydraulic control valve group, solving the problem of fragmented safety functions and lack of system integration in existing hydraulic manned winches.

[0020] The hydraulic limit valve is mechanically triggered by the drum shaft, requiring no electrical control and is inherently explosion-proof; the relief valve provides precise overload protection; and the check valve, in conjunction with a manual pump, enables emergency release.

[0021] Fully hydraulically driven with no electrical control components involved in the main actions, it has inherent explosion-proof performance and is suitable for applications with extremely high explosion-proof requirements, such as oil drilling platforms. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a highly safe dual-brake hydraulic manned winch structure according to the present invention; Figure 2 This is a side view schematic diagram of a high-safety dual-brake hydraulic manned winch according to the present invention; Figure 3 This is a hydraulic schematic diagram of a highly safe dual-brake hydraulic manned winch according to the present invention.

[0023] Explanation of markings in the diagram: 1-Frame, 2-Manual directional valve, 3-Valve group, 301-Shuttle valve one, 302-Shuttle valve two, 303-Shuttle valve three, 304-Two-way balance valve, 305-Pressure gauge, 306-Relief valve, 307-Check valve, 4-Hydraulic motor, 5-First brake, 6-Reducer, 7-Drum body, 8-Slack rope protection device, 801-Roller, 802-Rotating arm, 803-Shaft, 804-Adjusting rod, 805-Hydraulic limit switch, 9-Brake disc, 10-Support shaft assembly, 11-Hydraulic limit valve, 12-Second brake (normally closed caliper brake), 13-Rope pressing mechanism. Detailed Implementation

[0024] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0025] like Figure 1 , Figure 2 As shown, this invention discloses a highly safe dual-brake hydraulic manned winch, comprising a frame 1. A hydraulic motor 4, a planetary reducer 6, and a drum 7 are mounted on the frame 1. The hydraulic motor 4 is connected to the planetary reducer 6, and the output end of the planetary reducer 6 is connected to one end of the drum 7. The other end of the drum 7 is connected to the frame 1 via a support shaft assembly 10. The hydraulic motor 4 can be a low-speed, high-torque motor.

[0026] The planetary reducer 6 has multiple wet brake discs inside as the first brake 5. One end of the drum body 7 is equipped with a brake disc 9, and a normally closed caliper brake 12 is mounted on the frame 1 and cooperates with the brake disc 9 as the second brake 12. The normally closed caliper brake 12 is of the hydraulic release and spring braking type.

[0027] like Figure 3 As shown, the control valve group 3 includes shuttle valve 1 301, shuttle valve 2 302, shuttle valve 303, bidirectional balance valve 304, pressure gauge 305, relief valve 306, and check valve 307. The first brake 5 and the second brake 12 are synchronously controlled by the same output terminal of the control valve group 3, opening when oil is supplied and closing when oil is discharged.

[0028] The slack rope protection device 8 includes a roller 801, a rotating arm 802, a rotating shaft 803, an adjusting rod 804, and a hydraulic limit switch 805. The wire rope passes through the roller 801. When the wire rope slacks, the roller 801 and the rotating arm 802 rotate around the rotating shaft 803, triggering the hydraulic limit switch 805 to issue a stop signal via the adjusting rod 804.

[0029] The relief valve 306 is set to a pressure corresponding to 1.05-1.1 times the rated load. When the load is overloaded, the system pressure rises to the set value of the relief valve 306, the relief valve opens to unload, and the hydraulic motor 4 stops lifting.

[0030] The hydraulic limit valve 11 is triggered by a miniature mechanism (such as a worm gear or planetary reducer and cam mechanism) driven by the shaft head of the drum body 7. When the drum rotates to the upper or lower limit position, the hydraulic limit valve 11 is activated, which releases the pressure oil in the control oil circuit back to the oil tank, causing the oil inlet pressure of the hydraulic motor 4 to drop, preventing it from continuing to drive the drum body 7 to rotate, thereby achieving limit protection.

[0031] When personnel are trapped at height due to a loss of pressure in the main hydraulic system or a winch malfunction, an external manual pump can supply oil to the brake 5 and normally closed caliper brake 12 via a one-way valve 307, forcibly opening the brakes. Simultaneously, in conjunction with the throttle valve in the system, the operator can control the descent speed of the drum 7, safely lowering the personnel basket to the ground, thus achieving an emergency release function.

[0032] The two-way balance valve 304 is installed on both sides of the hydraulic motor 4 to prevent the load from falling uncontrollably when the pipeline bursts. It can also prevent safety accidents caused by incorrect pipeline connection and ensure the smoothness of the lifting and lowering process.

[0033] Working principle:

[0034] During normal operation, the hydraulic pump supplies oil, and the control valve group 3 simultaneously supplies oil to the first brake 5 and the second brake 12, causing both brakes to open at the same time. By operating the manual directional valve 2, the hydraulic oil drives the hydraulic motor 4, which, after being reduced in speed by the planetary reducer 6, drives the drum body 7 to rotate, thereby realizing the winding and unwinding of the wire rope.

[0035] When braking is required, control valve group 3 simultaneously unloads oil, and the two brakes close simultaneously under the action of spring force, achieving synchronous braking.

[0036] In case of overload, the relief valve 306 overflows to relieve the load. In case of overspeed or pipe breakage, the two-way balance valve 304 limits the motor speed. At the extreme position, the hydraulic limit valve 11 cuts off the oil circuit.

Claims

1. A highly safe dual-brake hydraulic manned winch, characterized in that, include: Rack (1); Hydraulic motor (4); Planetary reducer (6) is connected to the hydraulic motor (4); The drum body (7) has one end connected to the output end of the planetary reducer (6) and the other end connected to the frame (1) through the support shaft assembly (10); The first brake (5) is a multi-plate wet brake located at the output end of the hydraulic motor (4); The second brake (12) is a normally closed caliper brake that acts directly on the brake disc (9) mounted on the drum body (7); The control valve group (3) is used to control the operation of the hydraulic motor (4), the first brake (5) and the second brake (12), and the first brake (5) and the second brake (12) are synchronously controlled by the control valve group (3); The limiting device includes a hydraulic limiting valve (11), which is driven and triggered by the shaft head of the drum body (7). When the drum body (7) rotates to the limit position, the hydraulic limiting valve (11) releases pressure to stop the hydraulic motor (4) from rotating. The overload protection device is an overflow valve (306) installed in the control valve group (3). When the load reaches 1.1 times the rated load, the overflow valve (306) opens to unload the hydraulic motor (4) and stop lifting. The slack rope protection device (8) includes a hydraulic limit switch (805), which sends a signal to stop the hydraulic motor (4) from rotating when the wire rope is slack.

2. The high-safety dual-brake hydraulic manned winch according to claim 1, characterized in that: The control valve group (3) is also provided with a two-way balance valve (304), which is located on both sides of the hydraulic motor (4) oil line.

3. The high-safety dual-brake hydraulic manned winch according to claim 1, characterized in that: The control valve group (3) is also equipped with a one-way valve (307) for use with the manual pump to achieve emergency release.

4. The high-safety dual-brake hydraulic manned winch according to claim 1, characterized in that: The hydraulic limit valve (11) is triggered by a worm gear or planetary reducer and cam mechanism driven by the shaft head of the drum body (7).

5. The high-safety dual-brake hydraulic manned winch according to claim 1, characterized in that: It also includes a manual directional valve (2) for manually controlling the hydraulic system.

6. The high-safety dual-brake hydraulic manned winch according to claim 1, characterized in that: The hydraulic motor (4) is a low-speed, high-torque motor.

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