Pull switch suitable for long-distance conveying and long-distance conveying system

Abstract

The invention provides a pull-cord switch suitable for long-distance conveying, and the pull-cord switch comprises a housing which is internally provided with a pull cord, a trigger assembly, a microswitch, and an indicating lamp. The indicating lamp is electrically connected with the microswitch and the trigger assembly, and when the microswitch and the trigger assembly work normally, the indicating lamp is kept on normally; when the trigger assembly is triggered or the microswitch is abnormal, the indicating lamp is turned off. Meanwhile, the rocker arm is connected with the microswitch through the trigger assembly, and when the pull rope is pulled, the trigger mechanism acts along with the rocker arm to trigger the microswitch to act. Therefore, by means of the mechanism, when the pull rope switch breaks down, which pull rope switch breaks down in long-distance transmission can be rapidly checked, the checking workload is greatly reduced, immediate replacement can be conducted after checking, the situation that equipment is shut down for a long time is avoided, and normal transmission work is not affected is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of long-distance transmission, and in particular to a pull-rope switch suitable for long-distance transmission and a long-distance transmission system. Background Art

[0002] In the long-distance transmission process, such as in the belt conveyor system, the pull rope switch plays a vital safety role. When the belt fails or an emergency occurs, the operator can quickly stop the belt operation by pulling the pull rope switch to avoid safety accidents.

[0003] However, in the related art, there are many pull-cord switches during long-distance transmission. When a pull-cord switch is triggered by mistake and causes a malfunction, it is usually necessary to check the status of the pull-cord switches one by one. The checking workload is large, resulting in long equipment downtime and affecting the normal transmission work. Summary of the invention

[0004] In response to the problems existing in the prior art, the embodiments of the present invention provide a pull-rope switch and a long-distance transportation system suitable for long-distance transportation, so as to solve or partially solve the technical problems in the prior art that when there is a pull-rope switch failure, the troubleshooting workload is large, resulting in long equipment downtime and affecting the normal transmission work.

[0005] In a first aspect of the present invention, there is provided a pull rope switch suitable for long-distance transportation, comprising: a housing, wherein a pull rope, a trigger assembly, a micro switch and an indicator light are arranged inside the housing; a mounting portion for mounting the indicator light is arranged on the front side of the housing, and a rocker arm is arranged on the back side of the housing;

[0006] The pull rope is connected to the rocker arm, and the rocker arm is connected to the micro switch through the trigger assembly. When the pull rope is pulled, the trigger mechanism moves with the rocker arm to trigger the abnormal action of the micro switch. When the micro switch is abnormally acted, the long-distance transmission line is cut off to ensure the safety of line transmission;

[0007] The indicator light is electrically connected to the micro switch and the trigger component. The indicator light is used to: remain always on when the micro switch and the trigger component are working normally; and go out when the trigger component is triggered or the micro switch operates abnormally.

[0008] In the above scheme, a bypass switch is also provided on the front of the shell, and the bypass switch is used to open when the trigger component is triggered or the micro switch is abnormal, so as to bypass the long-distance transmission line to ensure normal transmission of the long-distance transmission line.

[0009] In the above scheme, the micro switch includes a normally closed contact and a normally open contact, and when the micro switch is normal, the normally closed contact is closed;

[0010] The indicator light is also used to: remain always on when the normally closed contact of the micro switch is closed; and go out when the normally closed contact is opened.

[0011] In the above solution, a spring is provided on the trigger assembly, and after the pull rope is pulled, the trigger mechanism is reset by the elastic force of the spring.

[0012] In the above solution, the housing is made of cast aluminum in one piece.

[0013] In the above solution, the pull-cord switch further comprises:

[0014] A control circuit, the control circuit is connected to the long-distance transmission line and is connected in series with the indicator light, the control circuit includes a first switch, the first switch is connected in parallel with the bypass switch, and the first switch includes the normally closed contact or a switch connected to the normally closed contact;

[0015] When the trigger component is triggered or the micro switch operates abnormally, the first switch is disconnected so that the indicator light is turned off.

[0016] In the above scheme, the normally open contact is used when the normally closed contact is damaged;

[0017] In this case, when the micro switch is in normal condition, the normally open contact is disconnected;

[0018] The indicator light is used to: remain always on when the normally open contact of the micro switch is disconnected; and go out when the normally open contact is closed.

[0019] A second aspect of the present invention provides a long-distance conveying system, the system comprising: a long-distance transmission belt, on which n pull-rope switches as described in any one of claims 1 to 7 are arranged in series in sequence, the pull-rope switches are controlled by a system control circuit, and the system control circuit is used for, when the pull rope of the Nth pull-rope switch among the n pull-rope switches is pulled, the indicator lights of the Nth pull-rope switch and subsequent pull-rope switches are turned off, and the indicator lights of the pull-rope switches before the Nth pull-rope switch remain on, wherein n is greater than or equal to 2, and N is greater than or equal to 1.

[0020] In the above scheme, the system control circuit includes a neutral line and a live line, the first switch of the n pull-wire switches is arranged on the live line, the indicator lights of the n pull-wire switches are electrically connected between the live line and the neutral line, and the belt line path of the long-distance transmission is arranged between the live line and the neutral line;

[0021] When the pull rope of the Nth pull rope switch is pulled, the first switch of the Nth pull rope switch is disconnected, and at this time, the belt line passage of the long-distance transmission is disconnected.

[0022] In the above scheme, the bypass switches of the n pull-wire switches are arranged between the live wire and the indicator light, and are arranged in parallel with the first switch. When the pull rope of the Nth pull-wire switch is pulled and the first switch of the Nth pull-wire switch is disconnected, the bypass switch of the Nth pull-wire switch remains closed, so as to achieve the closure of the belt line passage for long-distance transmission.

[0023] The present invention provides a pull-cord switch and a long-distance conveying system suitable for long-distance transportation. The pull-cord switch of the present application comprises: a shell, wherein a pull-cord, a trigger assembly, a micro switch and an indicator light are arranged inside the shell; a mounting portion for mounting the indicator light is arranged on the front side of the shell, and a rocker arm is arranged on the back side of the shell; the pull-cord is connected to the rocker arm, and the rocker arm is connected to the micro switch through the trigger assembly, and when the pull-cord is pulled, the trigger mechanism moves along with the rocker arm to trigger the micro switch to move, and when the micro switch moves, it cuts off the long-distance transportation line to ensure the safety of the line transmission; the indicator light is electrically connected to the micro switch and the trigger assembly, and the indicator light is used to: remain always on when the micro switch and the trigger assembly are working normally; and go out when the trigger assembly is triggered or the micro switch is abnormal.

[0024] The present application is electrically connected to the micro switch and the trigger assembly through the indicator light. When the micro switch and the trigger assembly are working normally, the indicator light remains on; when the trigger assembly is triggered or the micro switch is abnormal, the indicator light goes out; at the same time, the rocker arm of the present application is connected to the micro switch through the trigger assembly. When the pull rope is pulled, the trigger mechanism moves with the rocker arm to trigger the micro switch to operate. Therefore, when the pull rope is pulled, the micro switch will be triggered to operate abnormally, and the indicator light will go out; therefore, the method of the present application can be used to quickly find out which pull rope switch is faulty in long-distance transmission when there is a pull rope switch failure, which greatly reduces the workload of troubleshooting. After troubleshooting, it can be replaced immediately, which will not cause long equipment downtime and will not affect the normal transmission work.

[0025] Furthermore, the present application also provides a bypass switch on the front of the housing, and the bypass switch is used to open when the trigger component is triggered or the micro switch is abnormal, so as to bypass the long-distance transmission line to ensure the normal transmission of the long-distance transmission line. Therefore, by using the solution of the present application, after quickly discovering the fault, the bypass switch can be directly opened to keep the transmission work normal, without causing the equipment to stop for too long, and without the need to perform equipment replacement operations, which further improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0027] Figure 1 A schematic diagram of the internal structure of a pull-cord switch according to an embodiment of the present invention is shown;

[0028] Figure 2 A front structural schematic diagram of a pull-cord switch according to an embodiment of the present invention is shown;

[0029] Figure 3 A schematic diagram of the back structure of a pull-cord switch according to an embodiment of the present invention is shown;

[0030] Figure 4 A circuit diagram of a control circuit according to an embodiment of the present invention is shown.

[0031] Figure 5 A circuit diagram of a system control circuit according to an embodiment of the present invention is shown.

[0032] In the figure: 1-housing; 2-pull rope; 3-trigger assembly; 4-micro switch; 5-indicator light; 11-installation part; 6-rocker arm; 7-bypass switch; K1-first switch. DETAILED DESCRIPTION

[0033] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0034] In long-distance transmission processes, such as long-distance belt conveyor systems, pull-cord switches play a vital safety role. When the belt fails or an emergency occurs, the operator can quickly stop the belt by pulling the pull-cord switch to avoid safety accidents.

[0035] However, the belt pull rope switch in the related art has some shortcomings during use. Especially in the application of long-distance conveyor belts, the number of pull rope switches on a belt ranges from a few to dozens. Once the pull rope switch is triggered by mistake or fails, there is no obvious status indication. When the maintenance personnel handle it, they usually need to check the status of the pull rope switches one by one, which is a large workload and causes a long equipment downtime. Moreover, some pull rope switches malfunction due to micro switch failures, and the problem cannot be found through the swing arm status of the pull rope switch. Usually, professional electricians are required to measure the circuit on and off of the pull rope switches one by one, which is more labor-intensive and affects the running time of the belt, thereby greatly affecting the transmission work.

[0036] In order to solve the above problems, the present application discloses the following technical solutions.

[0037] In order to solve the above problems, the present application discloses the following technical solutions.

[0038] According to a first aspect of the present invention, the present application provides a pull-rope switch suitable for long-distance transportation, such as Figure 1-Figure 3 As shown, it comprises: a housing 1, wherein a pull rope 2, a trigger assembly 3, a micro switch 4 and an indicator light 5 are arranged inside the housing 1; a mounting portion 11 for mounting the indicator light 5 is arranged on the front of the housing 1, and a rocker arm 6 is arranged on the back of the housing 1;

[0039] The pull rope 2 is connected to the rocker arm 6, and the rocker arm 6 is connected to the micro switch 4 through the trigger assembly 3. When the pull rope 2 is pulled, the trigger mechanism moves with the rocker arm 6, triggering the abnormal action of the micro switch 4. When the micro switch 4 acts abnormally, it cuts off the long-distance transmission line to ensure the safety of the line transmission;

[0040] The indicator light 5 is electrically connected to the micro switch 4 and the trigger component 3. The indicator light 5 is used to: remain always on when the micro switch 4 and the trigger component 3 work normally; and go out when the trigger component 3 is triggered or the micro switch 4 operates abnormally.

[0041] The indicator light 5 of the present application can use a high-brightness, low-power LED lamp as the indicator light 5, and the indicator light 5 is installed on the housing, wherein the light-emitting surface of the indicator light 5 is located on the front of the housing 1, and the indicator light 5 can be installed on the housing 1 through the mounting portion 11, which is convenient for operators to observe. The circuit design of the LED indicator light 5 ensures that it is in a lit state under normal circumstances.

[0042] In one embodiment of the present application, the housing 1 of the present application can be made of cast aluminum, wherein the cast aluminum is high-strength, corrosion-resistant cast aluminum, has a long service life, good dustproof and shockproof performance, and can ensure the reliability and stability of the pull-cord switch.

[0043] In one embodiment of the present application, the trigger mechanism of the present application is composed of a sensitive mechanical structure. When the pull rope 2 is pulled, the trigger mechanism moves along with the rocker arm 6 to trigger the micro switch 4.

[0044] In one embodiment of the present application, the micro switch 4 of the present application can be a Z-15GW22-B type micro switch 4.

[0045] The present application is electrically connected to the micro switch 4 and the trigger assembly 3 through the indicator light 5. When the micro switch 4 and the trigger assembly 3 work normally, the indicator light 5 remains on; when the trigger assembly 3 is triggered or the micro switch 4 is abnormal, the indicator light 5 goes out; at the same time, the rocker arm 6 of the present application is connected to the micro switch 4 through the trigger assembly 3. When the pull rope 2 is pulled, the trigger mechanism moves with the rocker arm 6 to trigger the micro switch 4 to act. Therefore, when the pull rope 2 is pulled, the micro switch 4 will be triggered to act abnormally, and then the indicator light 5 will go out; therefore, the method of the present application can be used to quickly find out which pull rope switch is faulty in long-distance transmission when there is a pull rope switch failure, which greatly reduces the workload of troubleshooting. After troubleshooting, it can be replaced immediately, which will not cause long equipment downtime and will not affect the normal transmission work.

[0046] Furthermore, the problem can be quickly located through the above solution, but repair and replacement are still required, which also affects the progress of long-distance transmission. Therefore, in order to solve this problem, the present application also discloses the following embodiments.

[0047] In one embodiment of the present application, a bypass switch 7 is also provided on the front side of the shell 1 of the present application. The bypass switch 7 is used to open when the trigger component 3 is triggered or the micro switch 4 is abnormal, so as to bypass the long-distance transmission line to ensure normal transmission of the long-distance transmission line.

[0048] The present application further provides a bypass switch 7 on the front of the housing 1. The bypass switch 7 is used to be opened when the trigger component 3 is triggered or the micro switch 4 is abnormal, so as to bypass the long-distance transmission line to ensure normal transmission of the long-distance transmission line. Therefore, by using the solution of the present application, after quickly discovering the fault, the bypass switch 7 can be directly opened to keep the transmission work normal, without causing the equipment to stop for too long, and without the need to perform equipment replacement operations, which further improves the work efficiency.

[0049] Furthermore, the pull-cord switch of the present application can display whether it is operating by connecting the normally open contact to the indicator light 5, but if the micro switch 4 fails, the initial difficulty cannot be quickly troubleshooted. Therefore, the troubleshooting difficulty caused by the failure of the micro switch 4 cannot be solved well.

[0050] In one embodiment of the present application, in order to solve this problem, the micro switch 4 of the present application includes a normally closed contact and a normally open contact. When the micro switch 4 is normal, the normally closed contact is closed; the indicator light 5 is also used to: remain lit when the normally closed contact of the micro switch 4 is closed; and go out when the normally closed contact is open.

[0051] The present application sets the micro switch 4 to include a normally closed contact and a normally open contact, and only uses one normally closed contact, while the normally open contact is used as a backup. Since the normally closed contact is used, the normally closed contact is closed when the micro switch 4 is normal; the indicator light 5 is also used to: keep it always on when the normally closed contact of the micro switch 4 is closed; and turn off when the normally closed contact is disconnected. Therefore, the problem of troubleshooting difficulties caused by using the normally open contact to connect the indicator light 5 to show whether it is operating can be avoided.

[0052] Moreover, when the normally closed contact is damaged, the normally open contact can be used as a backup. Specifically, in one embodiment of the present application, the normally open contact is used when the normally closed contact is damaged. In this case, when the micro switch 4 is normal, the normally open contact is disconnected. The indicator light 5 is used to: remain on when the normally open contact of the micro switch 4 is disconnected; and go out when the normally open contact is closed.

[0053] Therefore, the present application provides multiple backup solutions that do not affect the progress of long-distance transmission, avoiding progress suspension due to failures and effectively improving efficiency.

[0054] In one embodiment of the present application, a spring is provided on the trigger assembly 3, and after the pull cord 2 is pulled, the trigger mechanism is reset by the spring force. Therefore, after the pull cord switch of the present application is pulled, it can be quickly reset without manual operation.

[0055] In one embodiment of the present application, Figure 4 As shown, the pull-cord switch of the present application also includes: a control circuit, which is connected to the long-distance transmission line and is connected in series with the indicator light. The control circuit includes a first switch K1, and the first switch K1 and the bypass switch K2 are connected in parallel. The first switch K1 of the present application includes the above-mentioned normally closed contact or a switch connected to the normally closed contact. That is, the present application Figure 2The first switch K1 in the circuit can directly use the normally closed contact in the micro switch 4, which can save costs as much as possible and directly perform linkage control with the micro switch 4. Of course, in order to maintain the independence of the micro switch 4, the first switch K1 can also use a switch connected to a normally closed contact, that is, linked control with the micro switch 4, and the present application does not limit this.

[0056] When the trigger assembly 3 is triggered or the micro switch 4 operates abnormally, the first switch K1 is disconnected to turn off the indicator light. The present application uses a simple control circuit to realize the linkage between the indicator light and the micro switch 4 and the trigger assembly 3. When the micro switch 4 and the trigger assembly 3 work normally, the indicator light remains on; when the trigger assembly 3 is triggered or the micro switch 4 operates abnormally, the indicator light turns off.

[0057] This application adopts a simple and practical circuit design, and the control circuit of this application can quickly and accurately control and respond to the start and stop of the belt. It has good stability and anti-interference ability, ensuring normal operation in various complex working environments.

[0058] The above introduces the technical content of the first aspect of this application, and the following will continue to introduce the content of the second aspect of this application.

[0059] The second aspect of the present invention provides a long-distance conveying system, which includes: a long-distance transmission belt, on which n pull-rope switches as mentioned in any of the above items are arranged in series in sequence, and the pull-rope switches are controlled by a system control circuit. The system control circuit is used to turn off the indicator lights of the Nth pull-rope switch and subsequent pull-rope switches when the pull rope 2 of the Nth pull-rope switch among the n pull-rope switches is pulled, and the indicator lights of the pull-rope switches before the Nth pull-rope switch remain on, wherein n is greater than or equal to 2, and N is greater than or equal to 1.

[0060] The long-distance conveying system of the present application is provided with a long-distance transmission belt, n pull-wire switches as mentioned in any of the above items, and a system control circuit. The system control circuit is used for when the pull-wire 2 of the Nth pull-wire switch among the n pull-wire switches is pulled, the indicator lights of the Nth pull-wire switch and the subsequent pull-wire switches are turned off, and the indicator lights of the pull-wire switches before the Nth pull-wire switch remain on. Therefore, during the long-distance conveying process, the problem can be quickly located by the turning off or on of the indicator lights of the pull-wire switches. For example, when the indicator lights of the third pull-wire switch and the subsequent ones are all turned off, it means that the third pull-wire switch is pulled. Therefore, it can be quickly located among the multiple pull-wire switches for long-distance transmission, thereby improving work efficiency.

[0061] Moreover, in the present application, after locating the pull-wire switch during long-distance transmission, further verification can be performed through the bypass switch K2 of the pull-wire switch. If the bypass switch K2 is turned on and all indicator lights are off, it can be determined that there is a problem with the pull-wire switch, thereby achieving accurate verification, further improving work efficiency, and avoiding the occurrence of misjudgment. The bypass switch K2 of the present application is the same as the bypass switch 7 mentioned above, and the two are the same.

[0062] In one embodiment of the present application, the system control circuit of the present application includes a neutral wire and a live wire, the first switch K1 of n pull-wire switches is set on the live wire, the indicator lights of the n pull-wire switches are electrically connected between the live wire and the neutral wire, and the belt line pathway for long-distance transmission is set between the live wire and the neutral wire; when the pull rope 2 of the Nth pull-wire switch is pulled, the first switch K1 of the Nth pull-wire switch is disconnected, and at this time, the belt line pathway for long-distance transmission is disconnected.

[0063] In one embodiment of the present application, the bypass switch K2 of n pull-wire switches is arranged between the live wire and the indicator light, and is arranged in parallel with the first switch K1. When the pull rope 2 of the Nth pull-wire switch is pulled and the first switch K1 of the Nth pull-wire switch is disconnected, the bypass switch K2 of the Nth pull-wire switch remains closed, so as to keep the belt line path for long-distance transmission closed.

[0064] like Figure 5 As shown, the present application takes n equal to 4 as an example, that is, the system of the present application includes: a belt for long-distance transmission, on which four pull-wire switches as mentioned in any of the above items are sequentially arranged in series. Among them, the system control circuit of the present application includes a neutral line N and a live line L, the first switch K1 of the four pull-wire switches is arranged on the live line, the indicator lights ③⑥⑦⑧ of the four pull-wire switches are electrically connected between the live line L and the neutral line N, and the belt line path for long-distance transmission is arranged between the live line and the neutral line. Among them, the bypass switch K2 of the four pull-wire switches is arranged between the live line and the indicator light, and is arranged in parallel with the first switch K1.

[0065] Under normal operation, all normally closed contacts are closed, the coil is energized, the long-distance transmission belt keeps running, and all indicator lights are on. Figure 3 The indicator lights ③⑥⑦⑧ are all on.

[0066] When the pull rope 2 of the second pull rope switch is pulled, the first switch K1 of the second pull rope switch is disconnected, and the corresponding normally closed contact 4 is disconnected, the coil loses power, and the belt stops running. At this time, the indicator light ③ remains on, and the indicator lights ⑥⑦⑧ are all off. From this analysis, the first pull rope switch that is off is the action switch. If it is found that the belt stops due to misoperation, after confirming the safety of the site, the bypass switch K2 can be pressed, and the entire long-distance transmission line is connected to resume the belt start. Therefore, the display of the indicator light of this application does not affect the emergency stop function of the pull rope switch. When the pull rope switch that malfunctions is indicated by the LED light, the belt stops. At this time, the operator can open the bypass switch K2 to bypass the pull rope switch and resume the belt start.

[0067] The above discloses a solution of four pull-cord switches. In practice, multiple pull-cord switches can be provided according to the long-distance transmission situation, for example, 10, 20, etc., and this application does not impose any limitation on this.

[0068] The above discloses a solution of four pull-cord switches. In practice, multiple pull-cord switches can be provided according to the long-distance transmission situation, for example, 10, 20, etc., and this application does not impose any limitation on this.

[0069] In summary, the present application adopts an innovative design concept, takes into account the special circumstances of micro switch failure and adds a bypass device, thereby achieving rapid troubleshooting and processing of pull-cord switch failures.

[0070] The present application discloses a pull-wire switch suitable for long-distance conveyor belts, which has the functions of flexible response to fault states and bypass. The pull-wire switch includes a housing, a swing arm, a trigger mechanism, a bypass switch and an LED indicator. The housing is made of cast aluminum and has good protective performance. The LED indicator is installed on the housing and is in a lit state under normal circumstances. When the pull-wire switch is triggered or the normally closed contact is disconnected, the LED lights of the pull-wire switch and the pull-wire switch in series are all off, indicating that the pull-wire switch is in a disconnected state. The operator can open the bypass switch and resume the start of the belt on the premise of confirming the safety of the site, and perform maintenance when the maintenance conditions are met, thereby realizing the functions of rapid troubleshooting and troubleshooting. The pull-wire switch of the present invention has the advantages of simple structure, convenient operation, high reliability, strong practicality, etc., and can greatly improve the stability and reliability of the belt conveyor system.

[0071] The design of the control circuit is simple and practical, and can accurately control the start and stop of the belt. The LED indicator is installed on the housing, and the operator can quickly determine the fault location according to the status of the LED indicator. At the same time, press the bypass switch to temporarily bypass the pull rope switch to restore the belt's ability to start. After the parking maintenance conditions are in place, a thorough maintenance process can be carried out, which greatly shortens the equipment downtime.

[0072] Specifically, the present application also has the following beneficial effects:

[0073] First, by setting the LED indicator light, the fault location can be quickly indicated when the pull-cord switch is triggered, greatly reducing the troubleshooting workload of maintenance personnel and shortening equipment downtime.

[0074] Second, the normally open contact of the pull-cord switch is not used to control the LED light. This is mainly to prevent unexpected situations such as micro switch failure. It can still be displayed through the LED indicator light, achieving 100% indication of the pull-cord switch action.

[0075] Third, the lamp display device adopts a low power consumption design and will not have a significant impact on the power load of the belt conveyor system.

[0076] Fourth, the control circuit is simple and practical, easy to implement and maintain.

[0077] Fifth, adding a bypass device facilitates emergency start-up of equipment and improves production flexibility and reliability.

[0078] Sixth, low investment and low cost. On the one hand, it is cheap and has low production cost. Compared with ordinary pull-cord switches, the cost is less than 20 yuan per unit. On the other hand, even if only one pull-cord switch is replaced on the existing belt, the difficulty of troubleshooting can be reduced to a certain extent. It can be replaced gradually on the existing belt system to avoid excessive one-time investment.

[0079] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0080] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those explicitly recited in each claim. More specifically, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention.

[0081] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments may be combined into one module or unit or component, and in addition they may be divided into a plurality of submodules or subunits or subcomponents. Except that at least some of such features and / or processes or units are mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0082] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims below, any one of the claimed embodiments may be used in any combination.

[0083] The various component embodiments of the present invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. It should be understood by those skilled in the art that a microprocessor or digital signal processor (DSP) may be used in practice to implement some or all functions of some or all components of a gateway, proxy electronic device, or system according to an embodiment of the present invention. The present invention may also be implemented as a device or apparatus program (e.g., a computer program and a computer program product) for executing part or all of the methods described herein. Such a program implementing the present invention may be stored on a computer-readable medium, or may be in the form of one or more signals. Such a signal may be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

[0084] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention may be implemented by means of hardware comprising a number of different elements and by means of a suitably programmed computer. In a unit claim enumerating a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

[0085] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pull-rope switch suitable for long-distance transportation, characterized in that: The invention comprises: a housing, wherein a pull rope, a trigger assembly, a micro switch and an indicator light are arranged inside the housing; a mounting portion for mounting the indicator light is arranged on the front side of the housing, and a rocker arm is arranged on the back side of the housing; The pull rope is connected to the rocker arm, and the rocker arm is connected to the micro switch through the trigger assembly. When the pull rope is pulled, the trigger mechanism moves with the rocker arm to trigger the abnormal action of the micro switch. When the micro switch is abnormally acted, the long-distance transmission line is cut off to ensure the safety of line transmission; The indicator light is electrically connected to the micro switch and the trigger component. The indicator light is used to: remain always on when the micro switch and the trigger component are working normally; and go out when the trigger component is triggered or the micro switch operates abnormally.

2. The pull cord switch according to claim 1, characterized in that: A bypass switch is also provided on the front of the shell, and the bypass switch is used to open when the trigger component is triggered or the micro switch is abnormal, so as to bypass the long-distance transmission line to ensure normal transmission of the long-distance transmission line.

3. The pull cord switch according to claim 1, characterized in that: The micro switch includes a normally closed contact and a normally open contact. When the micro switch is in normal state, the normally closed contact is closed. The indicator light is also used to: remain always on when the normally closed contact of the micro switch is closed; and go out when the normally closed contact is opened.

4. The pull-cord switch according to claim 1, characterized in that: The trigger assembly is provided with a spring, and after the pull rope is pulled, the trigger mechanism is reset by the elastic force of the spring.

5. The pull-cord switch according to claim 1, characterized in that: The shell is made of cast aluminum in one piece.

6. The pull-cord switch according to claim 3, characterized in that: The pull-cord switch also includes: A control circuit, the control circuit is connected to the long-distance transmission line and is connected in series with the indicator light, the control circuit includes a first switch, the first switch is connected in parallel with the bypass switch, and the first switch includes the normally closed contact or a switch connected to the normally closed contact; When the trigger component is triggered or the micro switch operates abnormally, the first switch is disconnected so that the indicator light is turned off.

7. The pull-cord switch according to claim 3, characterized in that: The normally open contact is used when the normally closed contact is damaged; In this case, when the micro switch is in normal condition, the normally open contact is disconnected; The indicator light is used to: remain always on when the normally open contact of the micro switch is disconnected; and go out when the normally open contact is closed.

8. A long distance transport system, characterized in that: The system comprises: a long-distance transmission belt, on which n pull-wire switches according to any one of claims 1 to 7 are arranged in series in sequence, and the pull-wire switches are controlled by a system control circuit, and the system control circuit is used for, when the pull rope of the Nth pull-wire switch among the n pull-wire switches is pulled, the indicator lights of the Nth pull-wire switch and subsequent pull-wire switches are turned off, and the indicator lights of the pull-wire switches before the Nth pull-wire switch remain on, wherein n is greater than or equal to 2, and N is greater than or equal to 1.

9. The long distance transport system according to claim 8, characterized in that: The system control circuit includes a neutral line and a live line, the first switch of the n pull-wire switches is arranged on the live line, the indicator lights of the n pull-wire switches are electrically connected between the live line and the neutral line, and the belt line path of the long-distance transmission is arranged between the live line and the neutral line; When the pull rope of the Nth pull rope switch is pulled, the first switch of the Nth pull rope switch is disconnected, and at this time, the belt line passage of the long-distance transmission is disconnected.

10. The long distance transport system according to claim 9, characterized in that: The bypass switches of the n pull-wire switches are arranged between the live wire and the indicator light and are arranged in parallel with the first switch. When the pull rope of the Nth pull-wire switch is pulled and the first switch of the Nth pull-wire switch is disconnected, the bypass switch of the Nth pull-wire switch remains closed to ensure that the belt line passage for long-distance transmission remains closed.

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