Optical fiber blocking switch

Abstract

The utility model discloses an optical fiber blocking switch, which belongs to the field of comprehensive protection of universal belt conveyors and comprises a shell, an optical fiber switch assembly and an automatic reset structure are arranged in the shell, an opening is arranged on one side of the shell, a movable plate is arranged on one side, close to the opening, in the shell, and the edge of one side of the movable plate is rotatably connected with the inner wall of the shell. When the movable plate rotates under the action of external acting force, the optical fiber switch assembly acts to send out a blocking signal, when the external acting force on the movable plate is eliminated, the automatic reset structure pushes the movable plate to reset, the blocking signal is removed, and a mechanical action signal is converted into an optical signal in the mode. Signal detection of a blocking switch is realized by adopting a mode of directly transmitting a switching signal by taking an optical fiber as a medium, the defects of an electronic signal type speed sensor in engineering application are overcome, the stability is high, and the service life is long.

Description

Technical Field

[0001] The utility model belongs to the field of comprehensive protection of universal belt conveyors, and in particular relates to an optical fiber blocking switch. Background Art

[0002] At present, all protection switches (sensors) including speed sensors in the comprehensive protection system of belt conveyors mostly use power-on switches. For economy, the switch is transmitted to the upper control system through a certain communication system to realize the positioning of multiple switches. However, this solution requires the increase of control power supply, complex system composition, and the installation of electronic devices at the industrial site. The stability is easily affected by the temperature at the site. In addition, it is often affected by strong electromagnetic interference at the site, oxidation of communication cable connectors and other problems, resulting in a decrease in communication quality and even disconnection, which has a great impact on the failure downtime rate of long-distance belt conveyors. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an optical fiber blocking switch, which overcomes the shortcomings of electronic signal blocking switches in engineering applications, has high stability, long service life, and is suitable for blocking detection and control of long-distance belt conveyors.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] A fiber optic blocking switch comprises a shell, in which an optical fiber switch assembly and an automatic reset structure are arranged, an opening is arranged on one side of the shell, a movable plate is arranged on the side of the shell close to the opening, and one side edge of the movable plate is rotatably connected to the inner wall of the shell; when the movable plate is rotated by an external force, the optical fiber switch assembly is actuated to send a blocking signal, and when the external force acting on the movable plate is eliminated, the automatic reset structure pushes the movable plate to reset.

[0006] Furthermore, an elastic sealing member is provided at the opening, and the sealing member is sealed with the edge of the opening.

[0007] Furthermore, a pressing frame is detachably mounted on the end surface of the opening, and the pressing frame presses the sealing member onto the end surface of the opening.

[0008] Furthermore, the shell is provided with an air hole connecting the inner and outer sides of the shell.

[0009] Furthermore, a limiting plate is provided on the side wall of the shell, and the limiting plate is located on the inner side of the free end of the movable plate.

[0010] Furthermore, the automatic reset structure includes a mounting post perpendicular to the bottom surface of the shell and a first reset spring sleeved on the mounting post, and one end of the first reset spring rests against the inner side surface of the movable plate.

[0011] Furthermore, the optical fiber switch assembly includes an optical fiber for inputting and outputting optical signals, a grating for reflecting optical signals, and a shielding component. The input and output ends of the optical fiber are arranged opposite to the reflecting end of the grating. When the movable plate rotates, it pushes the shielding component to shield between the input and output ends of the optical fiber and the reflecting end of the grating.

[0012] Furthermore, the shielding assembly includes a pressure rod, a blocking rod and a second return spring arranged on the optical fiber switch housing. One end of the pressure rod is connected to the optical fiber switch housing, and the other end abuts against the inner side of the movable plate. When the movable plate rotates, the blocking rod is pushed by the pressure rod to slide between the optical fiber and the grating.

[0013] Furthermore, a roller is provided at the end of the pressure rod close to the movable plate, and a circumferential surface of the roller is in contact with the movable plate.

[0014] Furthermore, a mounting seat is provided in the shell, and a long fixing hole is provided on the mounting seat, the extending direction of which is consistent with the moving direction of the blocking rod, and the optical fiber switch housing is fixed to the mounting seat by bolts passing through the fixing hole.

[0015] After adopting the above technical solution, the beneficial effects of the utility model are:

[0016] The optical fiber blocking switch of the utility model comprises a shell, an optical fiber switch assembly and an automatic reset structure are arranged in the shell, an opening is arranged on one side of the shell, a movable plate is arranged on the side of the shell close to the opening, and one side edge of the movable plate is rotatably connected to the inner wall of the shell; when the movable plate is rotated by an external force, the optical fiber switch assembly is actuated to send out a blocking signal, and when the external force acting on the movable plate is eliminated, the automatic reset structure pushes the movable plate to reset, and the blocking signal is released at this time. This method converts the mechanical action signal into an optical signal, and uses optical fiber as a medium to directly transmit the switch signal to realize signal detection of the blocking switch, thereby overcoming the shortcomings of electronic signal speed sensors in engineering applications, and has high stability and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the external structure of the optical fiber blocking switch of the utility model;

[0018] Figure 2 It is a schematic diagram of the internal structure of the optical fiber blocking switch of the utility model;

[0019] Figure 3 yes Figure 1 Sectional view along line AA;

[0020] In the figure, 10-housing, 11-movable plate, 12-hinge, 13-seal, 14-compression frame, 15-limiting plate, 16-optical fiber interface, 21-optical fiber switch housing, 22-optical fiber, 23-grating, 24-roller, 25-pressure rod, 26-blocking rod, 30-mounting seat, 31-fixing hole, 32-bolt, 40-mounting column, 41-first return spring. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the protection scope of the present invention.

[0022] like Figure 2 and Figure 3 As shown together, a fiber optic blocking switch includes a shell 10, in which a fiber optic switch assembly and an automatic reset structure are arranged, an opening is arranged on one side of the shell 10, and a movable plate 11 is arranged on the side of the shell 10 close to the opening, and one side edge of the movable plate 11 is rotatably connected to the inner wall of the shell 10, and the upper side edge of the movable plate 11 shown in the figure is connected to the inner wall of the shell 10 through a hinge 12.

[0023] The optical fiber blocking switch of the present application is installed at the opening of the funnel. When the material in the funnel is blocked, the movable plate 11 is subjected to external force and rotates around its upper edge. When a certain angle is reached, the optical fiber switch assembly is activated to send out a blocking signal; when the external force acting on the movable plate 11 is eliminated, the automatic reset structure pushes the movable plate 11 to reset.

[0024] like Figure 1 and Figure 3 As shown in the figure, an elastic seal 13 is provided at the opening, and the seal 13 is sealed with the edge of the opening. The seal 13 plays a sealing role to prevent materials from entering the inside of the blocking switch, ensure the normal function of each structure, and can bear a certain deformation, so that the movable plate 11 can rotate at a certain angle. Among them, the seal 13 is a rubber sheet.

[0025] Specifically, the end surface of the opening is detachably mounted with a compression frame 14, which compresses the rubber sheet against the end surface of the opening. The housing 10 is provided with an air hole connecting the inside and outside of the housing 10 to prevent the negative pressure from causing the action or reset failure.

[0026] Furthermore, a limit plate 15 is provided on the side wall of the housing 10. The limit plate 15 is located inside the free end of the movable plate 11 and is used to limit the movable plate 11 to prevent the movable plate 11 from rotating too much and damaging the optical fiber switch assembly.

[0027] like Figure 3 As shown, the automatic reset structure includes a mounting post 40 perpendicular to the bottom surface of the housing 10 and a first reset spring 41 sleeved on the mounting post 40, and one end of the first reset spring 41 is pressed against the inner side surface of the movable plate 11. The bottom surface here refers to the side wall opposite to the opening, that is, the left side wall in the figure. The figure shows the initial state of the movable plate 11 without external force. At this time, the first reset spring 41 pushes the movable plate 11 out of the opening of the housing 10 by a smaller distance. When the movable plate 11 is rotated inward by external force, the first reset spring 41 is compressed. When the external force on the movable plate 11 is eliminated, the elastic force of the first reset spring 41 pushes the movable plate 11 to rotate outward and reset.

[0028] like Figure 2 and Figure 3 As shown together, the optical fiber switch assembly includes an optical fiber 22 for inputting and outputting optical signals, a grating 23 for reflecting optical signals, and a shielding component. The input and output ends of the optical fiber 22 are arranged opposite to the reflection end of the grating 23. When there is no shielding between the optical fiber 22 and the grating 23, the optical signal emitted by the optical fiber 22 is reflected by the grating 23 and then input into the optical fiber 22; when the movable plate 11 rotates, the shielding component is pushed to shield between the input and output ends of the optical fiber 22 and the reflection end of the grating 23, and the optical signal emitted by the optical fiber 22 cannot be reflected back into the optical fiber 22 by the grating 23. The wavelength of the optical signal finally output by the optical fiber 22 will be offset to a certain extent, which can be read by the optical modem, thereby realizing the conversion of the mechanical action signal into an optical signal.

[0029] Specifically, the shielding assembly includes a pressure rod 25, a stop rod 26, and a second return spring (not shown in the figure) disposed between the optical fiber switch housing 21 and the stop rod 26. One end of the pressure rod 25 is connected to the optical fiber switch housing 21, and the other end is against the inner side of the movable plate 11. When the movable plate 11 is rotated by an external force, the stop rod 26 is pushed by the pressure rod 25 to slide between the optical fiber 22 and the grating 23, and the second return spring is compressed at this time; when the external force on the movable plate 11 is eliminated and the movable plate 11 is reset under the action of the first return spring 41, the pressure on the pressure rod 25 is eliminated, and the elastic force of the second return spring pushes the stop rod and the pressure rod 25 to reset.

[0030] like Figure 3 As shown, a roller 24 is provided at the end of the pressure rod 25 close to the movable plate 11, and the circumferential surface of the roller 24 is in contact with the movable plate 11, that is, there is rolling friction between the pressure rod 25 and the movable plate 11, so that the friction between the pressure rod 25 and the movable plate 11 is smaller, which can improve the sensitivity of the blocking switch.

[0031] Furthermore, a mounting seat 30 is provided in the housing 10, and a long fixing hole 31 extending in the same direction as the moving direction of the blocking rod 26 is provided on the mounting seat 30, and the optical fiber switch housing 21 is fixed to the mounting seat 30 by a bolt 32 passing through the fixing hole 31. The optical fiber 22 and the grating 23 are fixed to the right surface of the mounting seat 30, and the distance of the optical signal path between the blocking rod 26 and the optical fiber 22 and the grating 23 in the initial state can be adjusted by adjusting the position of the bolt 32 in the fixing hole 31, and the staff can adjust the rotation amount of the movable plate 11 when the blocking switch is triggered as needed.

[0032] The side wall of the housing 10 is provided with an optical fiber interface 16, and the optical fiber 22 in the housing 10 is connected to the optical fiber interface 16. In actual use, after the optical modem is connected to the optical fiber interface 16, the optical fiber switch assembly starts to work. After being triggered, the refraction signal of the grating 23 makes the wavelength of the optical signal output by the optical fiber 22 through the optical fiber interface 16 correspond to a specific value. The optical modem will read and demodulate the optical signal of the specific wavelength for use by the rear control, or directly send out an alarm signal. In addition, optical fiber blocking switches at different installation positions use optical fiber switch assemblies with different wavelength specifications. Multiple optical fiber switch assemblies can be connected to the optical modem through a fiber core, and the optical modem can locate the blocking position according to the demodulated signal.

[0033] The optical fiber blocking switch of the utility model uses optical fiber as the medium to directly transmit pulse signals to achieve detection. There is no signal crosstalk and electromagnetic interference, no fear of lightning strikes, no failures and communication quality problems caused by leakage current, temperature and connector oxygen. It has extremely high lifespan and stability, reliability, and weather resistance. No power supply is required on site and there is no problem of power supply over ultra-long distances.

[0034] In the description of this specification, unless otherwise clearly defined, words such as "setting", "installation", and "connection" should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meaning of the above words in this utility model based on the specific content of the technical solution.

[0035] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0036] Although the specific implementation methods of the utility model are described above, those skilled in the art should understand that the described embodiments are only part of the implementation methods of the utility model, rather than all the implementation methods, which are only examples, and the protection scope of the utility model is defined by the claims. Those skilled in the art can make various changes or modifications to these implementation methods without departing from the principle and essence of the utility model and without any creative work, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. An optical fiber blocking switch, characterized in that: The invention comprises a housing, wherein an optical fiber switch assembly and an automatic reset structure are arranged in the housing, an opening is arranged on one side of the housing, a movable plate is arranged on one side of the housing close to the opening, and one side edge of the movable plate is rotatably connected to the inner wall of the housing; When the movable plate is rotated by an external force, the optical fiber switch assembly is actuated to send out a blocking signal. When the external force on the movable plate is eliminated, the automatic reset structure pushes the movable plate to reset.

2. The optical fiber blocking switch according to claim 1, characterized in that: An elastic sealing member is arranged at the opening, and the sealing member is sealed with the edge of the opening.

3. The optical fiber blocking switch according to claim 2, characterized in that: A pressing frame is detachably mounted on the end surface of the opening, and the pressing frame presses the sealing member onto the end surface of the opening.

4. The optical fiber blocking switch according to claim 2, characterized in that: The shell is provided with an air hole communicating with the inner and outer sides of the shell.

5. The optical fiber blocking switch according to claim 1, characterized in that: A limiting plate is arranged on the side wall of the shell, and the limiting plate is located on the inner side of the free end of the movable plate.

6. The optical fiber blocking switch according to claim 1, characterized in that: The automatic reset structure comprises a mounting post perpendicular to the bottom surface of the housing and a first reset spring sleeved on the mounting post, and one end of the first reset spring abuts against the inner side surface of the movable plate.

7. The optical fiber blocking switch according to any one of claims 1 to 6, characterized in that: The optical fiber switch assembly includes an optical fiber for inputting and outputting optical signals, a grating for reflecting optical signals, and a shielding component. The input and output ends of the optical fiber are arranged opposite to the reflecting end of the grating. When the movable plate rotates, it pushes the shielding component to shield between the input and output ends of the optical fiber and the reflecting end of the grating.

8. The optical fiber blocking switch according to claim 7, characterized in that: The shielding assembly includes a pressure rod and a blocking rod arranged on the optical fiber switch housing, and a second return spring arranged between the optical fiber switch housing and the blocking rod. One end of the pressure rod is connected to the optical fiber switch housing, and the other end abuts against the inner side of the movable plate. When the movable plate rotates, the blocking rod is pushed by the pressure rod to slide between the optical fiber and the grating.

9. The optical fiber blocking switch according to claim 8, characterized in that: A roller is arranged at the end of the pressure rod close to the movable plate, and a circumferential surface of the roller is in contact with the movable plate.

10. The optical fiber blocking switch according to claim 8, characterized in that: A mounting seat is arranged in the shell, and a long fixing hole is opened on the mounting seat, the extending direction of which is consistent with the moving direction of the blocking rod, and the optical fiber switch housing is fixed to the mounting seat by bolts passing through the fixing hole.

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