Optical fiber passive pull rope sensor with pull rope falling detection function

Abstract

The utility model relates to an optical fiber passive pull rope sensor with a pull rope falling detection function, which comprises a shell, a driving shaft, an optical switch I and an optical switch II, the driving shaft is rotatably connected with the shell, the optical switch I and the optical switch II are mounted on the shell, and a trigger plate and a driving plate connected with a pull rope are fixedly arranged on the driving shaft; the trigger plate is fixedly provided with a toggle plate and a trigger piece extending to the position between the optical switch I and the optical switch II, a trigger shaft of the optical switch I and a trigger shaft of the optical switch II both face the trigger piece and are both located on the moving track of the trigger piece, the toggle plate is connected with a spring I, and the end, away from the toggle plate, of the spring I is fixedly arranged. According to the utility model, through the arrangement of the positions of the trigger sheet, the optical switch I and the optical switch II and the arrangement of the spring I, the optical switch I is triggered when an accident occurs, and the optical switch II is triggered when the pull rope falls off, so that the dual functions of emergency shutdown and pull rope falling detection are realized, and the device can be used in various environments.

Description

Technical Field

[0001] This utility model relates to the field of optical fiber passive sensor technology, and in particular to the prevention of pull rope detachment in belt conveyors, specifically referring to an optical fiber passive pull rope sensor with pull rope detachment detection. Background Technology

[0002] Belt conveyors are common equipment for transporting materials. Due to the long length of the conveyor belt, they can meet the requirements of long-distance transportation and are widely used in various fields.

[0003] In actual conveying operations, unexpected situations inevitably arise, requiring timely shutdown measures to prevent the accident from escalating. Due to the large length of belt conveyors and the fact that the drive motor is often located at the upper end of the belt, it is not always possible to stop the machine in a timely manner.

[0004] To address the issue of long belt conveyors making timely shutdown inconvenient, pull-rope switches are commonly used. The length of the pull rope connected to the switch can also be set to be relatively long, ensuring that operators can manipulate the rope over a greater range. By pulling the rope, the conveyor can be stopped, facilitating timely shutdown in case of emergencies.

[0005] However, during long-term use, the pull rope and the pull rope switch may become loose, or the pull rope may break due to wear or misoperation, causing the pull rope to fall off. A detached pull rope cannot reliably control the pull rope switch when it is pulled. Therefore, if the loosening or breakage of the pull rope is not detected in time, it will be impossible to perform emergency stop operations in the event of an emergency. Utility Model Content

[0006] This invention addresses the shortcomings of existing technologies by providing a fiber optic passive pull rope sensor with pull rope detachment detection, which can promptly detect pull rope detachment so that staff can handle it in a timely manner.

[0007] This utility model is achieved through the following technical solution: a passive fiber optic pull-cord sensor with pull-cord detachment detection is provided, including a housing, a drive shaft rotatably connected to the housing, and optical switches I and II mounted on the housing. A trigger plate and a drive plate connected to the pull-cord are fixed on the drive shaft. A toggle plate and a trigger piece extending between optical switches I and II are fixed on the trigger plate. The trigger shafts of optical switches I and II are both oriented toward the trigger piece and are both located on the movement trajectory of the trigger piece. A spring I is connected to the toggle plate, and the end of spring I away from the toggle plate is fixedly disposed.

[0008] During operation, when a malfunction occurs and the machine needs to be stopped, pulling the pull rope rotates the drive plate, which in turn rotates the drive shaft. When the drive shaft rotates, it causes the trigger plate to rotate in the forward direction. When the trigger plate rotates in the forward direction, the trigger piece pushes the trigger shaft of optical switch I, thus triggering optical switch I. During normal operation, if the pull rope comes loose, spring I drives the actuating plate to rotate in the reverse direction. The trigger piece pushes the trigger shaft of optical switch II, triggering optical switch II, thus facilitating the timely detection of pull rope detachment.

[0009] As an optimization, both optical switch I and optical switch II are located inside the housing. A fixed partition is fixedly installed inside the housing to mount optical switches I and II, and a through hole is provided on the fixed partition for the trigger plate to pass through. This optimized solution places optical switches I and II inside the housing, using the housing to protect them, thus adapting to more complex environments. The through hole on the fixed partition facilitates the rotation of the trigger plate.

[0010] As an optimization, a [shaped plate] is fixed to the inner wall of the housing. The spring I is located between the top and bottom plates of the [shaped plate]. A guide rod passing through the inner hole of the spring I is fixed and installed on the [shaped plate]. A fork adapted to the guide rod is provided on the actuating plate. One end of the spring I abuts against the top plate of the [shaped plate], and the other end abuts against the actuating plate. This optimized solution facilitates the installation of the spring I by setting the [shaped plate] and the guide rod. By setting the fork on the actuating plate, the guide rod is prevented from obstructing the movement of the actuating plate, and the structure is simple.

[0011] As an optimization, the drive plate is located outside the housing, and a fixing sleeve is provided between the housing and the drive plate to be fixedly connected to the housing. A through hole is provided in the fixing sleeve for the drive shaft to pass through.

[0012] The drive plate is slidably provided with a positioning pin facing the fixed sleeve. The positioning pin is connected to the drive plate by spring II. The fixed sleeve is provided with a positioning hole that matches the positioning pin. This optimized solution places the drive plate on the outside of the housing, which is convenient for connecting to the pull rope and eliminates the need to make a pull rope through hole in the housing. By setting the fixed sleeve, the support points for the drive shaft are increased, improving stability. By setting the positioning pin and positioning hole, when the pull rope is pulled for emergency stop, the positioning pin rotates to the position opposite to the positioning hole and extends into the positioning hole first under the action of spring II, preventing the drive shaft from rotating back and achieving locking after stopping.

[0013] As an optimization, the drive plate includes an intermediate plate sleeved and fixed on the drive shaft, and end plates extending from both ends of the intermediate plate away from the housing. The end plates have connection holes for the pull rope to pass through. This optimized drive plate is a single piece formed by the intermediate plate and end plates, resulting in a simple structure. Furthermore, the connection holes facilitate connection with the pull rope.

[0014] As an optimization, a guide sleeve is fixedly connected to the side of the drive plate away from the housing. A guide hole is provided inside the guide sleeve for the positioning pin to pass through. One end of the spring II is fixedly connected to the guide sleeve, and the other end is fixedly connected to the positioning pin, which passes through the inner hole of the spring II. This optimized solution provides guidance for the movement of the positioning pin by setting the guide sleeve, ensuring that the positioning pin is inserted into the positioning hole. The spring II also gives the positioning pin a tendency to move towards the positioning hole, ensuring reliable entry of the positioning pin into the positioning hole when it rotates to face the positioning hole.

[0015] As an optimization, the drive shaft is rotatably connected to the housing and the fixed sleeve via bearings. A sealing ring is fitted onto the drive shaft at the end of the fixed sleeve's through-hole furthest from the housing. This optimization reduces frictional resistance during drive shaft rotation by using bearings, improving the flexibility of the drive plate and trigger plate's movements. The sealing ring also prevents dust from entering the bearings.

[0016] The beneficial effects of this utility model are as follows: by setting the positions of the trigger plate and light switches I and II, as well as the setting of spring I, light switch I is triggered when an accident occurs, and light switch II is triggered when the pull rope falls off, thus realizing the dual functions of emergency stop and pull rope fall detection. Moreover, the sealing performance is improved by setting the housing and sealing ring, and it can be used in various environments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a side view of the present invention;

[0019] Figure 3 This is a diagram showing the usage state of this utility model;

[0020] As shown in the figure:

[0021] 1. Housing, 2. Fixed partition, 3. Spring I, 4. Drive shaft, 5. Bearing, 6. Sealing ring, 7. Drive plate, 8. Positioning pin, 9. Trigger plate, 10. Optical switch I, 11. Optical switch II, 12. Fixed sleeve, 21. Fiber optic passive pull rope sensor with pull rope detachment detection, 22. Rope clamp, 23. Rope support ring, 24. Pull rope. Detailed Implementation

[0022] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0023] like Figure 1The present invention discloses a passive fiber optic pull-cord sensor with pull-cord detachment detection, comprising a housing 1, a drive shaft 4 rotatably connected to the housing 1, and optical switches I 10 and II 11 mounted on the housing. A trigger plate 9 and a drive plate 7 connected to the pull-cord 24 are fixed on the drive shaft 4. Optical switches I 10 and II 11 are both passive fiber optic types in the prior art. The trigger is achieved by the movement of the trigger shaft, thereby sending a signal to the main control system.

[0024] A toggle plate is fixedly mounted on the trigger plate 9, and a trigger piece extending between optical switches I and II. The trigger shafts of optical switches I and II are both oriented towards the trigger piece and are located on the movement trajectory of the trigger piece. The toggle plate is connected to a spring I3, with the end of spring I3 away from the toggle plate fixedly mounted. When the drive shaft rotates in the forward direction, the toggle plate compresses spring I3, and the trigger piece pushes the trigger shaft of optical switch I to move. When the drive shaft rotates in the reverse direction, the trigger piece pushes the trigger shaft of optical switch II to move.

[0025] In this embodiment, both optical switch I 10 and optical switch II 11 are located inside the housing 1. The housing provides protection for optical switches I 10 and II 11 to withstand various harsh operating conditions. A fixed partition 2 is fixedly installed inside the housing 1 to mount optical switches I and II. The fixed partition 2 can be bolted to the housing. The fixed partition facilitates the installation of the optical switches and fiber coils, and also facilitates the separation of the optical fiber from the moving parts to prevent damage to the optical fiber and interference with the movement of the moving parts. The fixed partition 2 has through holes for the trigger plate to pass through, ensuring the flexible and reliable operation of the trigger plate.

[0026] To facilitate the installation of spring I3, a [shaped plate] is fixed to the inner wall of the housing in this embodiment. The opening of the [shaped plate] faces the actuating plate. Spring I3 is located between the top and bottom plates of the [shaped plate]. A guide rod passing through the inner hole of spring I is fixed on the [shaped plate]. A fork adapted to the guide rod is provided on the actuating plate. One end of spring I rests against the top plate of the [shaped plate], and the other end rests against the actuating plate. When the driving plate rotates forward with the driving shaft, the actuating plate compresses spring I3. To reduce support costs, the guide rod in this embodiment is a long bolt. The long bolt passes through the top and bottom plates of the [shaped plate] from top to bottom. A nut threaded onto the long bolt is provided below the bottom plate of the [shaped plate] to fix the long bolt.

[0027] To facilitate cable routing, the drive plate 7 in this embodiment is located on the outside of the housing, and a fixing sleeve 12 is provided between the housing and the drive plate, which is fixedly connected to the housing. The fixing sleeve 12 has a through hole for the drive shaft 4 to pass through. In this embodiment, the drive shaft is rotatably connected to the housing and the fixing sleeve through bearings 5. A sealing ring 6 is provided on the drive shaft at the end of the through hole of the fixing sleeve away from the housing to prevent dust from entering the bearing.

[0028] A positioning pin 8 is slidably mounted on the drive plate 7 and faces the fixed sleeve. The positioning pin is parallel to the drive shaft and is connected to the drive plate 7 by a spring II. The fixed sleeve has a positioning hole that matches the positioning pin. Specifically, a guide sleeve is fixedly connected to the side of the drive plate away from the housing. The guide sleeve has a guide hole for the positioning pin to pass through. One end of the spring II is fixedly connected to the guide sleeve, and the other end is fixedly connected to the positioning pin. The positioning pin passes through the inner hole of the spring II, and the spring II causes the positioning pin to tend to move toward the positioning hole.

[0029] The drive plate 7 includes an intermediate plate sleeved and fixed on the drive shaft, and end plates extending from both ends of the intermediate plate away from the housing. The end plates have connection holes for the pull rope to pass through. During manufacturing, the drive plate is a single-piece molded part, and the end plates are formed by bending, further simplifying the structure.

[0030] In this embodiment, optical switches I10 and II11 are respectively connected to the main control system and transmit signals to the main control system after being triggered.

[0031] In this embodiment, during installation, if... Figure 3 As shown, the pull rope 24 is connected to end a and end b of the fiber optic passive pull rope sensor 21 with pull rope detachment detection in this embodiment. The pull rope 24 passes through the connection hole on the drive plate 7 and is fixed with the rope clamp 22. The pull rope 24 passes through the rope support ring 23, so that the pull rope 24 is in a taut state. The trigger plate on the trigger plate 9 is between optical switch I 10 and optical switch II 11. Optical switch I 10 and optical switch II 11 are in the on state. When the pull rope 24 falls off, the drive plate 7 is not subjected to the force of the pull rope. Under the action of spring I 3, the trigger plate 9 rotates in the opposite direction, triggering optical switch II 11. Optical switch II 11 is disconnected, and the signal is transmitted to the main control system. The main control system outputs a corresponding signal.

[0032] When an emergency stop is required, pulling the pull rope 24 overcomes the action of spring I3, causing the drive plate 7 to rotate forward, which in turn causes the trigger plate on the trigger plate 9 to rotate forward. Spring I3 is compressed, and the positioning pin 8 rotates with the drive plate 7 until it aligns with the positioning hole on the fixed sleeve 12. Under the action of spring II, it inserts into the positioning hole and triggers the light switch I10. The light switch I10 opens, and the signal is transmitted to the main control system. The main control system outputs a corresponding signal to stop the machine. When a reset is required, the positioning pin 8 must be manually pulled out. Under the action of spring I3, the trigger plate 9 and the drive plate 7 rotate in the opposite direction, returning to the initial state.

[0033] It should be noted that, in this field, situations where the connection between the pull rope and the drive board becomes loose, or where the pull rope fails to function when an emergency stop operation is required due to wear or human error, are all referred to as pull rope detachment.

[0034] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A passive fiber optic pull-cord sensor with pull-cord detachment detection, characterized in that: Includes a housing (1), a drive shaft (4) rotatably connected to the housing (1), and optical switches I (10) and II (11) mounted on the housing. A trigger plate (9) and a drive plate (7) connecting a pull rope (24) are fixed on the drive shaft (4). The trigger plate (9) is fixedly provided with a toggle plate and a trigger piece extending between the optical switch I and the optical switch II. The trigger shafts of the optical switch I and the optical switch II are both set toward the trigger piece and are both located on the moving trajectory of the trigger piece. The toggle plate is connected to the spring I (3), and the end of the spring I (3) away from the toggle plate is fixedly set.

2. The fiber optic passive pull-cord sensor with pull-cord detachment detection according to claim 1, characterized in that: The optical switch I (10) and optical switch II (11) are both located inside the housing (1). A fixed partition (2) for mounting the optical switch I and optical switch II is fixed inside the housing (1). A through hole for the trigger plate to pass through is provided on the fixed partition (2).

3. The fiber optic passive pull-cord sensor with pull-cord detachment detection according to claim 1, characterized in that: A [shaped plate] is fixed to the inner wall of the housing. The spring I (3) is located between the top plate and the bottom plate of the [shaped plate]. A guide rod is fixed through the inner hole of the spring I on the [shaped plate]. A fork adapted to the guide rod is opened on the actuating plate. One end of the spring I is pushed against the top plate of the [shaped plate], and the other end is pushed against the actuating plate.

4. The fiber optic passive pull-cord sensor with pull-cord detachment detection according to claim 1, characterized in that: The drive plate (7) is located outside the housing, and a fixed sleeve (12) is provided between the housing and the drive plate to be fixedly connected to the housing. A through hole is provided in the fixed sleeve (12) for the drive shaft (4) to pass through. The drive plate (7) is provided with a positioning pin (8) facing the fixed sleeve. The positioning pin (8) is connected to the drive plate (7) by a spring II. The fixed sleeve is provided with a positioning hole that matches the positioning pin.

5. The fiber optic passive pull-cord sensor with pull-cord detachment detection according to claim 4, characterized in that: The drive plate (7) includes an intermediate plate sleeved and fixed on the drive shaft, and end plates extending from both ends of the intermediate plate away from the housing. The end plates are provided with connection holes for the pull rope to pass through.

6. The fiber optic passive pull-cord sensor with pull-cord detachment detection according to claim 4, characterized in that: A guide sleeve is fixed to the side of the drive plate away from the housing. A guide hole is opened in the guide sleeve for the positioning pin to pass through. One end of the spring II is fixed to the guide sleeve, and the other end is fixed to the positioning pin. The positioning pin passes through the inner hole of the spring II.

7. The fiber optic passive pull-cord sensor with pull-cord detachment detection according to claim 4, characterized in that: The drive shaft is rotatably connected to the housing and the fixed sleeve through bearings (5), and a sealing ring (6) is provided on the drive shaft at the end of the through hole of the fixed sleeve away from the housing.

Images