Shearing Pin Monitoring Device and Method, Dumbbell Pin

Abstract

The present invention discloses a broken pin monitoring device and method, and a dumbbell pin. The broken pin monitoring device includes a housing and a first spring, a first friction belt, a second friction belt, a fuse, and an antenna coil disposed inside the housing. The first spring is located at the first end of the housing, the first end of the first spring is connected to the housing, the first end of the first friction belt is connected to the second end of the first spring, the first end of the second friction belt is connected to the second end of the housing, at least a part of the second friction belt is in contact with the first friction belt, the first end of the fuse is connected to the first end of the first friction belt, the second end of the fuse is connected to the first end of the second friction belt, one end of the antenna coil is connected to the first friction belt or the second friction belt through an electrode, and the other end of the antenna coil is grounded. The broken pin monitoring device of the present invention is installed on the surface of the dumbbell pin, avoiding damage to the integrity of the dumbbell pin structure, and moreover, it does not require power supply drive and transmits information wirelessly, reducing the maintenance cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of monitoring devices, and particularly relates to a broken pin monitoring device and method, and a dumbbell pin. Background Art

[0002] A scraper conveyor is a transportation machine used in coal mining working faces, mainly for transporting in coal mining faces and gate roads in the mining area, and can also be used in driving faces of coal roadways and semi-measure rock roadways. A dumbbell pin is an important component connecting between middle troughs of a scraper conveyor, and the state of the dumbbell pin directly affects the stable operation of the scraper conveyor.

[0003] In related technologies, most of the broken pin detection devices are used to detect pins such as positioning pins that do not bear loads or bear relatively small loads. The pin is used as a component for gas or liquid sealing. When the pin breaks, gas or liquid leaks, resulting in a decrease in fluid pressure, that is, whether the pin breaks is detected by measuring the fluid pressure. This broken pin detection method is only suitable for use in non-loaded pins. In loaded pins, the additionally processed fluid channels will damage the structural integrity, not only increasing the design difficulty of the structure, but also reducing the structural safety. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related technologies to some extent. For this reason, an embodiment of the present invention provides a broken pin monitoring device, which is installed on the surface of the dumbbell pin, does not damage the structural integrity of the dumbbell pin itself, does not reduce the load-bearing capacity of the dumbbell pin, and moreover, the device does not require power drive and transmits information wirelessly, which can reduce the maintenance cost during use, ensure the safe and stable operation of the coal mine, and improve the production efficiency.

[0005] An embodiment of the second aspect of the present invention further provides a broken pin monitoring method.

[0006] An embodiment of the third aspect of the present invention further provides a dumbbell pin.

[0007] The pin breakage monitoring device according to an embodiment of the present invention includes a housing, a first spring, a first friction belt, a second friction belt, a fuse, and an antenna coil. The first spring is disposed inside the housing and at the first end of the housing. The first end of the first spring is connected to the housing. The first friction belt is disposed inside the housing. The first end of the first friction belt is connected to the second end of the first spring. The second end of the first friction belt extends toward the second end of the housing. The second friction belt is disposed inside the housing. The first end of the second friction belt is connected to the second end of the housing. The second end of the second friction belt extends toward the first end of the housing. At least a part of the second friction belt is attached to the first friction belt. The fuse is disposed inside the housing. The first end of the fuse is connected to the first end of the first friction belt. The second end of the fuse is connected to the first end of the second friction belt. One end of the antenna coil is connected to the first friction belt or the second friction belt through an electrode, and the other end of the antenna coil is grounded.

[0008] The pin breakage monitoring device according to an embodiment of the present invention is installed on the surface of the dumbbell pin, without an additional fluid channel machined inside the dumbbell pin, avoiding damage to the integrity of the structure of the dumbbell pin itself and reducing the load-bearing capacity of the dumbbell pin. At the same time, the pin breakage monitoring device generates triboelectricity using the principle of triboelectric nanogenerator, and uses the triboelectricity to drive the antenna coil to emit electromagnetic wave signals into space, transmitting the dumbbell pin breakage information to the controller, without the need for power supply drive and transmitting information wirelessly, which can reduce the maintenance cost during use, ensure the safe and stable operation of the equipment, and improve production efficiency.

[0009] In some embodiments, the pin breakage monitoring device further includes a second spring. The second spring is disposed inside the housing and at the second end of the housing. The first end of the second spring is connected to the housing. The second end of the second spring is connected to the first end of the second friction belt, so that the friction belt is connected to the housing through the second spring.

[0010] In some embodiments, the housing includes a first housing and a second housing. The first spring is located inside the first housing and the first end of the first spring is connected to the inner wall of the first housing. The second spring is located inside the second housing and the first end of the second spring is connected to the inner wall of the second housing.

[0011] In some embodiments, the housing further includes a sliding guide rail. The length of the sliding guide rail extends along the length direction of the first friction belt. At least a part of the first friction belt and at least a part of the second friction belt are both located inside the sliding guide rail. The sliding guide rail presses the overlapping part of the first friction belt and the second friction belt.

[0012] In some embodiments, the sliding guide rail is an elastic sliding guide rail.

[0013] The pin breakage monitoring method according to the second aspect of the present invention uses the pin breakage monitoring device of any one of the above embodiments, and includes the following steps:

[0014] Connect the first end of the pin breakage monitoring device to the first end of the dumbbell pin, and connect the second end of the pin breakage monitoring device to the second end of the dumbbell pin;

[0015] When the dumbbell pin breaks or has too large a deformation, the fuse breaks, the first friction belt moves toward the first end of the housing under the pulling force of the first spring, the first friction belt and the second friction belt slide relative to each other, so that the first friction belt and the second friction belt carry opposite charges and generate an alternating current pulse, and the current pulse drives the antenna coil to emit an electromagnetic wave signal into space;

[0016] After the terminal receives the electromagnetic wave signal emitted by the antenna coil, it alarms the breakage of the dumbbell pin.

[0017] The pin breakage monitoring method according to the second aspect of the present invention drives the antenna coil to emit an electromagnetic wave signal into space through the current pulse generated by triboelectricity. After the terminal receives the electromagnetic wave signal emitted by the antenna coil, it alarms, without the need to additionally set up a power supply and transmits information wirelessly, which can reduce the maintenance cost during use and ensure the safe and stable operation of the equipment.

[0018] In some embodiments, the electrodes on the first friction belt or the second friction belt are arranged in a certain order, so that the current pulse includes a coding section, so that the electromagnetic wave signal carries the number of the pin breakage monitoring device.

[0019] In some embodiments, the current pulse further includes a start section and an end section.

[0020] The dumbbell pin according to the third aspect of the present invention includes a dumbbell pin body and the pin breakage monitoring device of any one of the above embodiments, and the pin breakage monitoring device is connected to the side surface of the dumbbell pin body that is prone to load-induced deformation and fracture.

[0021] The dumbbell pin according to the third aspect of the present invention connects the pin breakage monitoring device to the side surface of the dumbbell pin body that is prone to load-induced deformation and fracture, without the need to additionally process a fluid channel inside the dumbbell pin, avoiding damaging the integrity of the dumbbell pin itself and reducing the load-bearing capacity of the dumbbell pin.

[0022] In some embodiments, there are multiple pin breakage monitoring devices, and the multiple pin breakage monitoring devices are respectively connected to different side surfaces of the dumbbell pin body. Description of the Drawings

[0023] Figure 1 It is a schematic diagram of the pin breakage monitoring device according to an embodiment of the present invention.

[0024] Figure 2 It is a schematic diagram of the first stage when the pin breakage monitoring device according to an embodiment of the present invention generates a current pulse.

[0025] Figure 3 It is a schematic diagram of the second stage when the pin breakage monitoring device according to an embodiment of the present invention generates a current pulse.

[0026] Figure 4 It is a schematic diagram of the third stage when the pin breakage monitoring device according to an embodiment of the present invention generates a current pulse.

[0027] Figure 5 It is a schematic diagram of the fourth stage when the pin breakage monitoring device according to an embodiment of the present invention generates a current pulse.

[0028] Figure 6 It is a schematic diagram of the electrode arrangement according to an embodiment of the present invention.

[0029] Figure 7 It is a schematic diagram of the dumbbell pin according to an embodiment of the present invention.

[0030] Reference numerals:

[0031] Outer shell 10; first housing 11; second housing 12; sliding guide 13; first spring 2; first friction band 3; second friction band 4; fuse 5; antenna coil 6; second spring 7; electrode 8; dumbbell pin body 9. Detailed implementation manners

[0032] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation to the present invention.

[0033] The pin breakage monitoring device according to an embodiment of the present invention will be described below with reference to the drawings.

[0034] As Figure 1 shown, the pin breakage monitoring device according to an embodiment of the present invention includes an outer shell 10, a first spring 2, a first friction band 3, a second friction band 4, a fuse 5, and an antenna coil 6.

[0035] Among them, the first spring 2 is arranged inside the outer shell 10 and is located at the first end of the outer shell 10 (such as Figure 1 the left end shown in Figure 1 ). The first end of the first spring 2 is connected to the outer shell 10. The first friction band 3 is arranged inside the outer shell 10. The first end of the first friction band 3 (such as Figure 1extends towards the second end of the housing 10 (i.e., the right end shown in [])), that is, the length of the first friction belt 3 is arranged in the left - right direction. The second friction belt 4 is arranged inside the housing 10. The first end of the second friction belt 4 (such as the right end shown in []) is connected to the second end of the housing 10 (such as the right end shown in []) Figure 1 the right end shown in []) Figure 1 the right end shown in []) Figure 1 the left end shown in []) extends towards the first end of the housing 10, that is, the length of the second friction belt 4 is arranged in the left - right direction. At least part of the second friction belt 4 is in contact with the first friction belt 3, and friction layers are provided on both the first friction belt 3 and the second friction belt 4. The two friction layers are made of different materials and are in contact with each other. When the first friction belt 3 and the second friction belt 4 slide relative to each other, the first friction belt 3 and the second friction belt 4 rub against each other and carry opposite charges.

[0036] The fuse 5 is arranged inside the housing 10. The first end of the fuse 5 is connected to the first end of the first friction belt 3 (such as the left end shown in []) Figure 1 the left end shown in []) and the second end of the fuse 5 (such as the right end shown in []) Figure 1 the right end shown in []) is connected to the first end of the second friction belt 4. In other words, the fuse 5 is connected to the first spring 2 and the second spring 7 respectively; before the dumbbell pin breaks, it deforms and elongates, increasing the tension on the fuse 5, and the first spring 2 and the second spring 7 connected to the fuse 5 are further tensioned.

[0037] The antenna coil 6 is connected inside the housing, and one end of the antenna coil 6 is connected to the first friction belt 3 or the second friction belt 4 through the electrode 8, and the other end of the antenna coil 6 is grounded.

[0038] It should be noted that when the dumbbell pin works, the dumbbell pin deforms and elongates under the action of the load, increasing the tension on the fuse 5, and the first spring 2 connected to the fuse 5 is further tensioned; when the breaking danger value is reached, the fuse 5 is pulled off, and the first spring 2 under the action of its own elastic force pulls the first friction belt 3 to move to the left, causing the first friction belt 3 and the second friction belt 4 to slide relative to each other. The first friction belt 3 and the second friction belt 4 rub against each other and generate current pulses, and the current pulses drive the antenna coil 6 to emit electromagnetic wave signals into the space to alarm the breakage of the dumbbell pin.

[0039] The pin breakage monitoring device according to the embodiment of the present invention is installed on the surface of the dumbbell pin, without an additional fluid channel machined inside the dumbbell pin, avoiding damage to the integrity of the structure of the dumbbell pin itself and reducing the load-bearing capacity of the dumbbell pin. At the same time, the pin breakage monitoring device generates triboelectricity using the principle of triboelectric nanogenerator, and uses the triboelectricity to drive the antenna coil 6 to emit electromagnetic wave signals into the space, transmitting the dumbbell pin breakage information to the controller, without the need for power supply drive and transmitting information wirelessly, which can reduce the maintenance cost during use, ensure the safe and stable operation of the equipment, and improve production efficiency.

[0040] As Figures 2 to 5 shown, in a specific embodiment, a friction layer A is provided on the first friction belt 3, a friction layer B is provided on the second friction belt 4, the friction layer A is attached to the friction layer B, and after the first friction belt 3 and the second friction belt 4 rub against each other, the friction layer A is positively charged and the friction layer B is negatively charged. A plurality of electrodes 8 arranged at intervals are provided on the second friction belt 4, and the plurality of electrodes 8 are all electrically connected to the antenna coil 6.

[0041] It should be noted that, as Figure 2 shown, in the first stage, the friction layer A is located in the gap of the electrode 8, that is, the friction layer A is far from the electrode 8. The electrode 8 is only electrostatically induced by the charge on the friction layer B, and the charge induced on the electrode 8 remains unchanged to make the circuit reach an equilibrium state. At this time, the induced charge amount on the electrode 8 reaches the maximum value. At this time, the voltage across the antenna coil 6 reaches the maximum value, and there is no current in the circuit.

[0042] As Figure 3 shown, in the second stage, the friction layer A gradually approaches above the electrode 8, and the electrostatic interaction between the charge on the friction layer A and the charge on the friction layer B located above the electrode 8 gradually increases, so that the electrostatic induction of the charge on the friction layer B on the electrode 8 gradually decreases, and the induced charge on the electrode 8 gradually decreases, causing electrons to flow from the ground to the electrode 8. At this time, the voltage across the antenna coil 6 gradually decreases, and a current from the electrode 8 to the ground is generated in the circuit.

[0043] As Figure 4 shown, in the third stage, the friction layer A reaches directly above the electrode 8, the electrostatic interaction between the charge on the friction layer A and the charge on the friction layer B located above the electrode 8 reaches the maximum value, the electrostatic induction of the charge on the friction layer B on the electrode 8 reaches the lowest value, and the induced charge on the electrode 8 reaches the lowest value. At this time, the voltage across the antenna reaches the minimum value, and there is no current in the circuit.

[0044] As Figure 5As shown, in the fourth stage, the friction layer A gradually moves away from above the electrode 8, and the electrostatic interaction between the charges on the friction layer A and the charges on the friction layer B located above the electrode 8 gradually decreases. This causes the electrostatic induction of the charges on the friction layer B on the electrode 8 to gradually increase, and the induced charges on the electrode 8 gradually increase, causing electrons to flow from the electrode 8 to the ground. At this time, the voltage across the two ends of the antenna coil 6 gradually rises, and a current from the ground to the electrode 8 is generated in the circuit.

[0045] After the friction layer A passes through an electrode 8 and completes the first stage, the second stage, the third stage, and the fourth stage, a current pulse is generated. By passing through multiple electrodes 8 and repeating the completion of the first stage, the second stage, the third stage, and the fourth stage, multiple current pulses are generated in the circuit. The multiple current pulses drive the antenna coil 6 to emit electromagnetic wave signals to alarm for the fracture of the dumbbell pin, ensuring the safe operation of the equipment.

[0046] As Figure 1 shown, in some embodiments, the pin breakage monitoring device further includes a second spring 7. The second spring 7 is disposed inside the housing 10 and is located at the second end of the housing 10 (such as Figure 1 the right end shown), the first end of the second spring 7 is connected to the housing 10, and the second end of the second spring 7 is connected to the first end of the second friction belt 4 (such as Figure 1 the right end shown), so that the friction belt is connected to the housing 10 through the second spring 7.

[0047] Thus, in the pin breakage monitoring device of the embodiment of the present invention, through the arrangement of the second spring 7, after the fuse 5 is broken, the first spring 2 and the second spring 7 respectively pull the first friction belt 3 and the second friction belt 4 towards the two ends of the housing, causing the first friction belt 3 and the second friction belt 4 to slide relative to each other. At the same time, the first spring 2 and the second spring 7 reduce the probability that the pin breakage monitoring device cannot operate normally due to spring failure, further improving the safety of equipment operation.

[0048] As Figure 1 shown, in some embodiments, the housing 10 includes a first housing 11 and a second housing 12. The first spring 2 is located inside the first housing 11 and the first end of the first spring 2 is connected to the inner wall of the first housing 11. The second spring 7 is located inside the second housing 12 and the first end of the second spring 7 is connected to the inner wall of the second housing 12. Thus, in the pin breakage monitoring device of the embodiment of the present invention, through the arrangement of the first housing 11 and the second housing 12, it is convenient to repair the components on one side of the housing, and at the same time, it avoids affecting the components on the other side.

[0049] As Figure 1As shown, in some embodiments, the outer shell 10 further includes a sliding guide rail 13. The length of the sliding guide rail 13 extends along the length direction of the first friction belt 3. The two ends of the sliding guide rail 13 are respectively communicated with the first shell 11 and the second shell 12. At least part of the first friction belt 3 and at least part of the second friction belt 4 are both located within the sliding guide rail 13, and the sliding guide rail 13 presses the overlapping part of the first friction belt 3 and the second friction belt 4.

[0050] Furthermore, the sliding guide rail 13 is an elastic sliding guide rail, such as a silicone sliding guide rail or a rubber sliding guide rail. Thus, the elastic sliding guide rail reduces the failure of the sliding guide rail breaking during the stretching process of the pin breakage monitoring device, thereby reducing the failure that the pin breakage monitoring device cannot work properly due to the breakage of the sliding guide rail.

[0051] The pin breakage monitoring method according to the second aspect of the present invention uses the pin breakage monitoring device of any of the above embodiments, and includes the following steps:

[0052] Connect the pin breakage monitoring device to the side of the dumbbell pin body where deformation and fracture are likely to occur under load, connect the first end of the pin breakage monitoring device to the first end of the dumbbell pin, and connect the second end of the pin breakage monitoring device to the second end of the dumbbell pin;

[0053] When the dumbbell pin breaks or the amount of deformation is too large, the fuse 5 breaks, and the first friction belt 3 moves towards the first end of the outer shell 10 under the pulling force of the first spring 2. The first friction belt 3 and the second friction belt 4 slide relative to each other, causing the first friction belt 3 and the second friction belt 4 to carry opposite charges and generate an alternating current pulse. The current pulse drives the antenna coil 6 to emit an electromagnetic wave signal into the space;

[0054] After the terminal receives the electromagnetic wave signal emitted by the antenna coil 6, it alarms the breakage of the dumbbell pin.

[0055] The pin breakage monitoring method according to the second aspect of the present invention drives the antenna coil 6 to emit an electromagnetic wave signal into the space through the current pulse generated by triboelectricity. After the terminal receives the electromagnetic wave signal emitted by the antenna coil 6, it alarms. There is no need to set up an additional power supply and the information is transmitted wirelessly, which can reduce the maintenance cost during use and ensure the safe and stable operation of the equipment.

[0056] In some embodiments, the electrodes 8 on the first friction belt 3 or the second friction belt 4 are arranged in a certain order, so that the current pulse includes a coding section, thereby making the electromagnetic wave signal carry the number of the pin breakage monitoring device. When the terminal receives the electromagnetic wave signal, it can simultaneously receive the number information of the pin breakage monitoring device, which is convenient for the staff to find the faulty dumbbell pin.

[0057] In some embodiments, the current pulse further includes a start section and an end section to avoid misjudgment of the signal.

[0058] As Figure 6 shown, in a specific embodiment, the electrodes 8 of the starting segment are arranged as "111", the electrodes 8 of the encoding segment are arranged as "10010", and the electrodes 8 of the ending segment are arranged as "111". When the first friction belt 3 and the second friction belt 4 slide relative to each other, one friction layer sweeps across the electrodes 8 on the other friction layer from left to right in sequence and emits a signal of "11110010111".

[0059] As Figure 7 shown, the dumbbell pin according to the embodiment of the third aspect of the present invention includes a dumbbell pin body 9 and the pin breakage monitoring device of any one of the above embodiments, and the pin breakage monitoring device is connected to the side surface of the dumbbell pin body 9 that is prone to be deformed and fractured under load.

[0060] The dumbbell pin according to the embodiment of the third aspect of the present invention connects the pin breakage monitoring device to the side surface of the dumbbell pin body 9 that is prone to be deformed and fractured under load, without the need for an additional fluid channel processed inside the dumbbell pin, thus avoiding damage to the integrity of the structure of the dumbbell pin itself and reducing the load-bearing capacity of the dumbbell pin.

[0061] In some embodiments, there are multiple pin breakage monitoring devices, and the multiple pin breakage monitoring devices are respectively connected to different side surfaces of the dumbbell pin body 9. Thus, the dumbbell pin according to the embodiment of the present invention reduces the faults of false alarms or non-alarms due to the failure of the pin breakage monitoring device by setting multiple pin breakage monitoring devices.

[0062] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0063] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0064] In the present invention, unless otherwise clearly specified or limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication between two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0066] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0067] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present invention.

Claims

1. A pin breakage monitoring device, characterized in that, it includes: a housing; a first spring, the first spring is arranged inside the housing and at the first end of the housing, and the first end of the first spring is connected to the housing; a first friction belt, the first friction belt is arranged inside the housing, the first end of the first friction belt is connected to the second end of the first spring, and the second end of the first friction belt extends towards the second end of the housing; a second friction belt, the second friction belt is arranged inside the housing, the first end of the second friction belt is connected to the second end of the housing, the second end of the second friction belt extends towards the first end of the housing, and at least part of the second friction belt is attached to the first friction belt; a fuse, the fuse is arranged inside the housing, the first end of the fuse is connected to the first end of the first friction belt, and the second end of the fuse is connected to the first end of the second friction belt; an antenna coil, one end of the antenna coil is connected to the first friction belt or the second friction belt through an electrode, and the other end of the antenna coil is grounded.

2. The pin breakage monitoring device according to claim 1, characterized in that, it further includes a second spring, the second spring is arranged inside the housing and at the second end of the housing, the first end of the second spring is connected to the housing, and the second end of the second spring is connected to the first end of the second friction belt, so that the friction belt is connected to the housing through the second spring.

3. The pin breakage monitoring device according to claim 2, characterized in that, the housing includes a first housing and a second housing, the first spring is located inside the first housing and the first end of the first spring is connected to the inner wall of the first housing, and the second spring is located inside the second housing and the first end of the second spring is connected to the inner wall of the second housing.

4. The pin breakage monitoring device according to claim 1, characterized in that, the housing further includes a sliding guide rail, the length of the sliding guide rail extends along the length direction of the first friction belt, at least part of the first friction belt and at least part of the second friction belt are both located inside the sliding guide rail, and the sliding guide rail presses the overlapping part of the first friction belt and the second friction belt.

5. The pin breakage monitoring device according to claim 4, characterized in that, the sliding guide rail is an elastic sliding guide rail.

6. A pin breakage monitoring method, characterized in that, it includes: providing a pin breakage monitoring device according to any one of claims 1-5, connecting the first end of the pin breakage monitoring device to the first end of the dumbbell pin, and connecting the second end of the pin breakage monitoring device to the second end of the dumbbell pin; when the dumbbell pin breaks or has too large a deformation, the fuse breaks, the first friction belt moves towards the first end of the housing under the pulling force of the first spring, the first friction belt and the second friction belt slide relative to each other, so that the first friction belt and the second friction belt carry opposite charges and generate a current pulse, and the current pulse drives the antenna coil to emit an electromagnetic wave signal into space; After the terminal receives the electromagnetic wave signal emitted by the antenna coil, it alarms for the fracture of the dumbbell pin.

7. The pin breakage monitoring method according to claim 6, wherein, the electrodes on the first friction belt or the second friction belt are arranged in a certain order so that the current pulse includes a coding section, thereby attaching the number of the pin breakage monitoring device to the electromagnetic wave signal.

8. The pin breakage monitoring method according to claim 7, wherein, the current pulse further includes a starting section and an ending section.

9. A dumbbell pin, wherein, it includes a dumbbell pin body and the pin breakage monitoring device according to any one of claims 1-5, and the pin breakage monitoring device is connected to the side surface of the dumbbell pin body that is prone to be deformed and fractured under load.

10. The dumbbell pin according to claim 9, wherein, there are multiple pin breakage monitoring devices, and the multiple pin breakage monitoring devices are respectively connected to different side surfaces of the dumbbell pin body.

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