Automatic switching over and protection device for cage or skip mode

Abstract

The utility model provides a kind of cage or skip two mode automatic switching overroll protection device, it is related to the technical field of elevator, including new overroll switch 4, telescopic actuating mechanism and electric control part;New overroll switch 4 uses normally open type micro motion stroke switch;Telescopic actuating mechanism is used to drive new overroll switch 4 and realizes the action of stretching out or retracting;Electric control part is integrated with the control cabinet of hoisting system by hardwiring mode.The utility model solves the installation position of the overroll protection switch of present, it is 0.5m (namely +0.5m) above unloading port (zero position), this installation position is completely in compliance with requirement under skip mode, but when cage mode, the installation position of overroll switch is 20.5m from cage, this distance is far beyond the requirement of regulation, if continue to use this overroll protection switch to realize relevant protection, overroll protection switch does not play the due protection function at this time, there is certain security risk.

Description

Technical Field

[0001] This utility model belongs to the field of hoisting technology, and more specifically, it relates to an overwind protection device that automatically switches between two modes: cage and skip. Background Technology

[0002] During on-site construction, the current installation position of the overwind protection switch is 0.5m above the unloading port (zero position) (i.e., +0.5m). This installation position is fully compliant with the requirements in the skip mode. However, in the cage mode, the installation position of the overwind protection switch is 20.5m away from the cage. This distance far exceeds the requirements of the regulations. If this overwind protection switch is continued to be used to achieve the relevant protection, the overwind protection switch will not play its due protective role and there is a certain safety hazard. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides an overwind protection device that automatically switches between two modes: cage and skip, in order to address the problems raised in the background art.

[0004] This utility model discloses an overwind protection device that automatically switches between two modes: cage and skip. This is achieved through the following specific technical means: An automatic overwind protection device for switching between cage and skip modes includes a new overwind switch, a telescopic actuator, and an electrical control unit. The new overwind switch is a normally open micro-switch. The telescopic actuator is used to drive the new overwind switch to extend or retract. The electrical control unit is integrated with the hoisting system control cabinet via hardwiring.

[0005] Furthermore, the telescopic actuator consists of a motor, a lead screw, and a slider. The motor is a DC geared motor with high torque output characteristics, and its output shaft is rigidly connected to the lead screw via a coupling. The lead screw is a trapezoidal threaded lead screw, installed in a lead screw mounting seat, which is fixed to the mounting bracket of the wellhead derrick by bolts. The slider is threadedly engaged with the lead screw, and the slider has a mounting groove adapted to the new overwind switch. The new overwind switch is fixed in the mounting groove of the slider by countersunk bolts. The motor drives the lead screw to rotate, thereby causing the slider to move along the lead screw axis.

[0006] Furthermore, the telescopic actuator is installed on the wellhead derrick and located 0.5m directly above the parking point of cage 7. An installation platform is provided at the corresponding position of the wellhead derrick, and the screw mounting seat of the telescopic actuator is firmly fixed to the installation platform by multiple sets of high-strength expansion bolts. A skip is provided in the opposite direction of the cage, and the skip and the cage alternately rise and fall.

[0007] Furthermore, the motor is a DC motor, controlled by a mode relay of the hoisting system. The mode relay is a highly reliable intermediate relay. When the hoisting system switches to cage mode, the control circuit outputs an electrical signal to energize the mode relay coil, closing the normally open contact of the mode relay and connecting the DC motor forward rotation control circuit. The motor rotates forward, driving the new overwind switch to extend. When the hoisting system switches to skip mode, the control circuit outputs an opposite electrical signal to de-energize the mode relay coil, opening the normally open contact of the relay and connecting the DC motor reverse rotation control circuit. The motor reverses, retracting the new overwind switch.

[0008] Furthermore, a status indicator light is installed on the mounting platform. The status indicator light is a dual-color LED indicator light and is protected by a transparent protective cover. The control circuit of the status indicator light is connected to the electronic control part. When the electronic control part controls the new overwind switch to extend, the status indicator light lights up green, indicating that the new overwind switch is in working condition. When the electronic control part controls the new overwind switch to retract, the status indicator light lights up red.

[0009] Furthermore, the electrical control section has a limitation in the control circuit of the overwind switch drive motor: in skip mode, the normally open contact of the mode relay in the hoisting system control cabinet is in the open state, so that the forward rotation control circuit of the overwind switch drive motor is always in the open circuit state, and the new overwind switch cannot extend. Only in cage mode, the normally open contact of the mode relay is closed, the forward rotation control circuit of the overwind switch drive motor is connected, and the new overwind switch can extend.

[0010] Furthermore, the electrical control unit has a limiting condition in the control circuit of the overwind switch drive motor: when the new overwind switch is in the extended state, the new overwind switch action feedback signal will be transmitted to the electrical control unit. The electrical control unit will use the control circuit to de-energize the control relay coil in the hoisting system control cabinet used to switch to the skip mode, and its normally open contact will remain open, thereby blocking the control signal path for the hoisting system to switch to the skip mode, and the system cannot switch to the skip mode.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. Improve the accuracy of safety protection: By automatically switching the overwind protection position, overwind protection that complies with safety regulations can be obtained in both cage mode and skip mode. This solves the problem of blind spots in the protection of traditional single protection devices in mixed hoisting systems and controls the overwind protection response distance within a safe range (0.5m in cage mode), which greatly reduces the risk of overwind accidents in hoisting equipment.

[0012] 2. Enhance system safety: Through dual interlocking control logic (the overwind switch cannot extend in skip mode, and switching to skip mode is prohibited when the switch is extended), the problem of equipment interference caused by misoperation is eliminated from the source of control, avoiding safety hazards such as collision between the cage and the overwind device or protection failure.

[0013] 3. Reduce equipment maintenance costs: The device adopts a simple design that combines mechanical structure and electrical control system. The core components (DC motor, trapezoidal lead screw, micro switch) are all mature industrial products with low failure rate and easy to purchase and replace. The maintenance cost of the whole system is only less than 30% of that of traditional customized protection devices.

[0014] 4. Improved ease of operation: The status indicator light provides real-time feedback on the position of the overwind switch, allowing operators to monitor the equipment status without on-site inspection; the automated switching mechanism eliminates the need for manual adjustment of the overwind device, saving approximately 5-10 minutes of operation time per mode switch and improving system operating efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] In the diagram, the correspondence between component names and drawing numbers is as follows: 3. Skip; 4. New overwind switch; 5. Motor; 6. Lead screw; 7. Cage. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0020] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model. Example

[0021] As attached Figure 1 As shown: This utility model provides an automatic overwind protection device for switching between cage and skip modes, including a new overwind switch 4, a telescopic actuator, and an electrical control unit; characterized in that the new overwind switch 4 is a normally open micro-motion limit switch; the telescopic actuator is used to drive the new overwind switch 4 to extend or retract; and the electrical control unit is integrated with the hoisting system control cabinet through hardwiring.

[0022] The telescopic actuator consists of a motor 5, a lead screw 6, and a slider. The motor 5 is a DC geared motor with high torque output characteristics, and its output shaft is rigidly connected to the lead screw 6 through a coupling. The lead screw 6 is a trapezoidal threaded lead screw, which is installed in a lead screw mounting seat. The lead screw mounting seat is fixed to the mounting bracket of the wellhead frame by bolts. The slider is threadedly engaged with the lead screw 6, and the slider has a mounting groove adapted to the new overwind switch 4. The new overwind switch 4 is fixed in the mounting groove of the slider by countersunk bolts. The motor 5 drives the lead screw 6 to rotate, thereby causing the slider to move along the axial direction of the lead screw 6.

[0023] The telescopic actuator is installed on the wellhead derrick and located 0.5m directly above the parking point of the cage 7. An installation platform is provided at the corresponding position of the wellhead derrick. The screw mounting seat of the telescopic actuator is firmly fixed to the installation platform by multiple sets of high-strength expansion bolts. The cage 7 is provided with a skip 3 in the opposite direction, and the skip 3 and the cage 7 alternately rise and fall.

[0024] The motor 5 is a DC motor, controlled by a mode relay of the hoisting system. The mode relay is a highly reliable intermediate relay. When the hoisting system switches to cage 7 mode, the control circuit outputs an electrical signal to energize the mode relay coil, closing the normally open contact of the mode relay and connecting the forward rotation control circuit of the DC motor 5. The forward rotation of the motor 5 drives the new overwind switch 4 to extend. When the hoisting system switches to skip 3 mode, the control circuit outputs an opposite electrical signal to de-energize the mode relay coil, opening the normally open contact of the relay. The reverse rotation control circuit of the DC motor 5 is then connected, and the motor 5 reverses to retract the new overwind switch 4.

[0025] The installation platform is equipped with status indicator lights, which are dual-color LED indicators protected by a transparent cover. The control circuit of the status indicator lights is connected to the electronic control unit. When the electronic control unit controls the new overwind switch 4 to extend, the status indicator lights up green, indicating that the new overwind switch 4 is in working condition. When the electronic control unit controls the new overwind switch 4 to retract, the status indicator lights up red.

[0026] The electrical control section has a limitation in the control circuit of the overwind switch drive motor 5: In skip 3 mode, the normally open contact of the mode relay in the hoisting system control cabinet is in the open state, so that the forward rotation control circuit of the overwind switch drive motor 5 is always in the open circuit state, and the new overwind switch 4 cannot extend. Only in cage 7 mode, the normally open contact of the mode relay is closed, the forward rotation control circuit of the overwind switch drive motor 5 is connected, and the new overwind switch 4 can extend.

[0027] The electrical control unit incorporates a limiting condition in the control circuit of the overwind switch drive motor 5: when the new overwind switch 4 is in the extended state, the feedback signal from the new overwind switch 4 is transmitted to the electrical control unit. The electrical control unit then uses a control circuit to de-energize the control relay coil in the hoisting system control cabinet used for switching to skip 3 mode, keeping its normally open contacts open. This blocks the control signal path for the hoisting system to switch to skip 3 mode, preventing the system from switching to skip 3 mode. The specific usage and function of this embodiment are as follows: In this utility model, the initial state is set. After the device is installed, it is in standby mode by default: the new overwind switch is in the retracted position, the status indicator light is red; the electrical control part establishes a signal connection with the hoisting system control cabinet to monitor the operating mode signal in real time.

[0028] Cage mode switching process When the operator selects "cage mode" in the hoisting system control cabinet, the control cabinet sends a cage mode electrical signal to the electrical control section. After receiving the signal, the electronic control unit triggers the mode relay to activate and connects the DC motor forward rotation control circuit. The motor drives the lead screw to rotate in the forward direction, which in turn moves the slider and the new overwind switch to the working position (0.5m above the cage stopping point). Once the limit switch is in position, its feedback contact activates, and the control status indicator light in the electrical control section changes from red to green, indicating that the cage protection state has been entered. If the cage overwinds and touches the limit switch at this time, the switch will immediately cut off the safety circuit of the hoisting system, forcing the hoist to stop urgently.

[0029] Winnowing pattern switching process When the operator selects "Misshole Mode", the control cabinet sends a misshole mode signal; The electrical control unit verifies the current status of the overwind switch: if it is in the retracted position, switch modes directly; if it is in the extended position, start the motor to reverse first. The motor drives the lead screw to rotate in the opposite direction, causing the limit switch to retract to the non-working position, and the status indicator light changes from green to red. After the retraction action is completed, the electrical control section allows the hoisting system to switch to skip mode. At this time, the limit switch does not interfere with the skip running path, and the original unloading port overwind switch assumes the protection function.

[0030] Safety interlock control In the skip mode, the electronic control unit continuously blocks the motor's forward rotation circuit, so even if there is a misoperation, the limit switch cannot be extended. When the limit switch is extended, the electronic control unit blocks the skip mode switching signal until the switch is fully retracted before the restriction is lifted. The switch position is fed back in real time via status indicator lights throughout the process, allowing operators to intuitively judge the device's status by observing changes in the lights.

[0031] This working method achieves closed-loop control of "pattern recognition - action execution - status feedback - safety interlock," enabling protection position switching without manual intervention. This ensures the effectiveness of safety protection under different operating modes while eliminating the risk of malfunctions through logical interlocks.

[0032] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. An automatic overwind protection device for switching between cage and skip modes, comprising a new overwind switch (4), a telescopic actuator, and an electrical control unit; characterized in that, The new overwind switch (4) is a normally open micro-motion limit switch; the telescopic actuator is used to drive the new overwind switch (4) to achieve the extension or retraction action; the electrical control part is integrated with the lifting system control cabinet through hard wiring.

2. The overwind protection device with automatic switching between cage and skip modes as described in claim 1, characterized in that: The telescopic actuator consists of a motor (5), a lead screw (6), and a slider. The motor (5) is a DC geared motor with high torque output characteristics, and its output shaft is rigidly connected to the lead screw (6) through a coupling. The lead screw (6) is a trapezoidal threaded lead screw, which is installed in the lead screw mounting seat. The lead screw mounting seat is fixed to the mounting bracket of the wellhead frame by bolts. The slider is threadedly engaged with the lead screw (6). The slider is provided with a mounting groove that is compatible with the new overwind switch (4). The new overwind switch (4) is fixed in the mounting groove of the slider by countersunk bolts. The motor (5) drives the lead screw (6) to rotate, thereby driving the slider to move along the axial direction of the lead screw (6).

3. The overwind protection device with automatic switching between cage and skip modes as described in claim 2, characterized in that: The telescopic actuator is installed on the wellhead frame and located 0.5m directly above the parking point of the cage (7). An installation platform is provided at the corresponding position of the wellhead frame. The screw mounting seat of the telescopic actuator is firmly fixed to the installation platform by multiple sets of high-strength expansion bolts. A skip (3) is provided in the opposite direction of the cage (7), and the skip (3) and the cage (7) rise and fall alternately.

4. The automatic switching overwind protection device for cage or skip modes as described in claim 3, characterized in that: The motor (5) is a DC motor, controlled by the mode relay of the hoisting system. The mode relay is an intermediate relay with high reliability. When the hoisting system switches to the cage (7) mode, the control circuit outputs an electrical signal to energize the mode relay coil, and the normally open contact of the mode relay closes, connecting the forward rotation control circuit of the DC motor (5). The forward rotation of the motor (5) drives the new overwind switch (4) to extend. When the hoisting system switches to the skip (3) mode, the control circuit outputs an opposite electrical signal to de-energize the mode relay coil, and the normally open contact of the relay opens. The reverse rotation control circuit of the DC motor (5) is connected, and the motor (5) reverses to realize the retraction of the new overwind switch (4).

5. The overwind protection device with automatic switching between cage and skip modes as described in claim 1, characterized in that: The mounting platform is equipped with a status indicator light, which is a dual-color LED indicator light and protected by a transparent protective cover. The control circuit of the status indicator light is connected to the electrical control part. When the electrical control part controls the new overwind switch (4) to extend, the status indicator light lights up green, indicating that the new overwind switch (4) is in working state. When the electrical control part controls the new overwind switch (4) to retract, the status indicator light lights up red.

6. The overwind protection device with automatic switching between cage and skip modes as described in claim 4, characterized in that: The electrical control section has a limitation in the control circuit of the overwind switch drive motor (5): In the skip (3) mode, the normally open contact of the mode relay in the hoisting system control cabinet is in the open state, so that the forward rotation control circuit of the overwind switch drive motor (5) is always in the open state, and the new overwind switch (4) cannot be extended. Only in the cage (7) mode, the normally open contact of the mode relay is closed, the forward rotation control circuit of the overwind switch drive motor (5) is connected, and the new overwind switch (4) can be extended.

7. The overwind protection device with automatic switching between cage and skip modes as described in claim 4, characterized in that: The electrical control section has a limitation in the control circuit of the overwind switch drive motor (5): when the new overwind switch (4) is in the extended state, the action feedback signal of the new overwind switch (4) will be transmitted to the electrical control section. The electrical control section will use the control circuit to make the control relay coil in the hoisting system control cabinet used to switch to the skip (3) mode de-energized, and its normally open contact will remain open, thereby blocking the control signal path of the hoisting system to switch to the skip (3) mode, and the system cannot switch to the skip (3) mode.

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