A dumbbell pin status monitoring sensor

Abstract

The application provides a dumbbell pin state monitoring sensor, and belongs to the technical field of dumbbell pin state monitoring, and the dumbbell pin state monitoring sensor comprises a shell, a first tag, a switch and a second tag, the first tag, the switch and the second tag are arranged in the shell, a reader / writer is arranged outside the shell, and the switch is used for controlling the conduction state of the second tag; when the switch is in a closed state, the first tag is wirelessly connected with the reader / writer, and the reader / writer reads the signal of the first tag; when the dumbbell pin appears a fault and is separated from a dumbbell pin groove, the switch is turned on, when the switch is in an open state, the second tag is turned on by the switch, the second tag is wirelessly connected with the reader / writer, the reader / writer can read the signal of the second tag, two signals are obtained through the reader / writer reading the signals of the first tag and the second tag, and accordingly, the state of the dumbbell pin is monitored, it is prompted that the dumbbell pin may appear a fault, and the reliability and accuracy of fault judgment are improved.

Description

Technical Field

[0001] This application belongs to the field of dumbbell pin condition monitoring technology, specifically relating to a dumbbell pin condition monitoring sensor. Background Technology

[0002] In coal mine longwall mining faces, the central troughs of the scraper conveyor are connected by dumbbell pins. During mining, hydraulic supports push the central troughs of the scraper conveyor towards the coal face. During this movement, the dumbbell pins bear significant tensile force, making them highly susceptible to damage and breakage, leading to their detachment or loss. Simultaneously, failure of the dumbbell pin stops and spring pins can also cause dumbbell pins to detach or be lost. If these detached or lost dumbbell pins are not detected promptly, they can easily cause misalignment or disassembly of the central trough connection during the hydraulic support's sliding motion, affecting normal production at the working face. Existing sensors have low reliability in monitoring the dumbbell pin status, impacting the ability to diagnose dumbbell pin malfunctions. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] In view of this, a dumbbell pin state monitoring sensor is proposed according to an embodiment of this application, comprising:

[0005] shell;

[0006] The first tag is located inside the casing and is electrically connected to the reader / writer, which is capable of reading the first tag.

[0007] The switch is located inside the casing.

[0008] The second tag is located inside the casing and is electrically connected to a switch. When the switch is turned on, the second tag is connected to the reader for reading.

[0009] In one feasible implementation, when the switch is turned on, the reader reads the first tag and the second tag simultaneously.

[0010] In one feasible implementation, the dumbbell pin status monitoring sensor further includes:

[0011] The battery is housed inside the casing and is electrically connected to the second tag and the switch. When the switch is turned on, a power circuit is formed, enabling the battery to power the second tag.

[0012] In one feasible implementation, the first tag is a passive RFID tag;

[0013] The second tag is an active RFID tag, which includes a transmitter chip that sends a signal to the reader when the switch is turned on.

[0014] In one feasible implementation, the dumbbell pin includes:

[0015] Pin;

[0016] Two hammerheads are located at both ends of the pin, and the outer casing is located on the hammerheads.

[0017] Two stops are located on the side of the hammer head away from the middle of the pin, and the stops are detachably connected to the pin.

[0018] In one feasible implementation, the dumbbell pin is installed in the dumbbell pin groove of the central slot, and a metal part is provided in the dumbbell pin groove, with the switch located near the metal part.

[0019] In one feasible implementation, the switch is a magnetic switch, which includes a magnetic body. The magnetic body is attracted by the metal part, so that the switch is in the closed state.

[0020] In one feasible implementation, the switch further includes:

[0021] An elastic element, the first end of which is fixed to a magnetic body;

[0022] The housing is placed on the outside of the magnetic body and is connected to the second end of the elastic element;

[0023] The base is located on the side of the magnet away from the elastic element, and the base is connected to the housing;

[0024] The contacts are located on the side of the base near the magnet. When the contacts come into contact with the magnet, the switch is turned on.

[0025] In one feasible implementation, when the switch is near the metal part, the metal part attracts the magnetic body, causing the magnetic body to separate from the contact, and the switch is closed.

[0026] When the switch is separated from the metal part, the magnetic body makes contact with the contacts under the action of the elastic element, and the switch is turned on.

[0027] In one feasible implementation, at least two contacts are symmetrically arranged on the base, and the contacts extend circumferentially along the magnet.

[0028] The dumbbell pin status monitoring sensor disclosed in this application has the following advantages compared with the prior art:

[0029] The dumbbell pin status monitoring sensor provided in this application includes a housing, a first tag, a switch, and a second tag. The first tag, switch, and second tag are all disposed inside the housing, while the reader / writer is disposed outside the housing. The switch controls the conduction state of the second tag. When the switch is in the closed state, the first tag is wirelessly connected to the reader / writer, and the reader / writer reads the signal from the first tag. When the dumbbell pin malfunctions and comes out of the dumbbell pin slot, the switch is turned on. When the switch is in the open state, the second tag is turned on by the switch, and the second tag is wirelessly connected to the reader / writer. The reader / writer can read the signal from the second tag. By reading the signals from the first and second tags, the reader / writer obtains two signals, thereby monitoring the status of the dumbbell pin and indicating a possible malfunction, thus improving the reliability and accuracy of fault diagnosis. Attached Figure Description

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0031] Figure 1 A schematic structural diagram of the first angle of a dumbbell pin state monitoring sensor according to an embodiment of this application;

[0032] Figure 2 A schematic structural diagram of the second angle of a dumbbell pin state monitoring sensor according to an embodiment of this application;

[0033] Figure 3 A schematic structural diagram illustrating the mounting position of a dumbbell pin status monitoring sensor according to an embodiment of this application;

[0034] Figure 4 A schematic structural diagram of the switch of a dumbbell pin state monitoring sensor according to an embodiment of this application;

[0035] in, Figures 1 to 4 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0036] 11. Casing; 12. First label; 13. Switch; 14. Second label; 15. Battery; 16. Dumbbell pin;

[0037] 131. Magnetic body; 132. Elastic element; 133. Housing; 134. Base; 135. Contact point;

[0038] 161. Pin; 162. Hammer; 163. Stop. Detailed Implementation

[0039] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0041] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0043] like Figure 1 and Figure 2 As shown in the embodiment of this application, a dumbbell pin status monitoring sensor is proposed, including: a housing 11, a first tag 12, a switch 13, and a second tag 14; the first tag 12 is disposed inside the housing 11 and is electrically connected to a reader / writer, which can read the first tag 12; the switch 13 is disposed inside the housing 11; the second tag 14 is disposed inside the housing 11 and is electrically connected to the switch 13. When the switch 13 is turned on, the second tag 14 is connected to the reader / writer to read the second tag 14.

[0044] The dumbbell pin status monitoring sensor provided in this application embodiment includes a housing 11, a first tag 12, a switch 13, and a second tag 14. The first tag 12, switch 13, and second tag 14 are all disposed inside the housing 11, while the reader is disposed outside the housing 11. The switch 13 is used to control the conduction state of the second tag 14. When the switch 13 is in the closed state, the first tag 12 is wirelessly connected to the reader, and the reader reads the signal of the first tag 12. When the dumbbell pin 16 malfunctions and comes out of the slot of the dumbbell pin 16, the switch 13 is turned on. When the switch 13 is in the open state, the second tag 14 is turned on by the switch 13 and is wirelessly connected to the reader. The reader can read the signal of the second tag 14. By reading the signals of the first tag 12 and the second tag 14, the reader obtains two signals, thereby monitoring the status of the dumbbell pin 16 and indicating that the dumbbell pin 16 may have malfunctioned, thus improving the reliability and accuracy of fault diagnosis.

[0045] Furthermore, the reader and the first tag 12 are wirelessly connected; when the switch 13 is in the open state, the second tag 14 is wirelessly connected to the reader, making the sensor structure independent of the reader, thereby avoiding the impact of external lines on the accuracy of sensor monitoring.

[0046] Furthermore, the housing 11 is a hollow cavity with an opening. After all the components inside the housing 11 are installed in place, electronic potting compound is injected to seal the components and fix their positions, thereby ensuring the stability and reliability of the internal structure of the sensor.

[0047] In one feasible implementation, when switch 13 is turned on, the reader reads the first tag 12 and the second tag 14 simultaneously.

[0048] In this technical solution, when switch 13 is turned on and the second tag 14 is wirelessly connected to the reader, the external reader can simultaneously read the signals of the first tag 12 and the second tag 14, indicating that the dumbbell pin 16 may be faulty; then, based on the signal content of the first tag 12 and the second tag 14, the dumbbell pin 16 at the corresponding position is located, ensuring the accuracy of fault detection of the dumbbell pin 16.

[0049] like Figure 1 and Figure 2 As shown, in one feasible embodiment, the dumbbell pin status monitoring sensor further includes: a battery 15; the battery 15 is disposed inside the housing 11, the battery 15 is electrically connected to the second tag 14, and the battery 15 is electrically connected to the switch 13; when the switch 13 is turned on, a power circuit is formed, enabling the battery 15 to supply power to the second tag 14.

[0050] In this technical solution, switch 13, battery 15, and second tag 14 are connected sequentially to form a circuit. When switch 13 is closed, the circuit is broken, battery 15 is disconnected from second tag 14, and the reader only reads the signal of first tag 12. When switch 13 is open, the circuit forms a loop, battery 15 is connected to second tag 14, supplying power to second tag 14, and the reader simultaneously reads the signals of second tag 14 and first tag 12. Switch 13 acts as a switch to activate battery 15, using battery 15 to supply power to second tag 14, thus enabling switch 13 to control the second tag 14. Indirect control of the conduction state of tag 14: Under normal working conditions of dumbbell pin 16, switch 13 and circuit are both in the off state to save battery 15 power. Battery 15 and circuit are only in the conducting state when dumbbell pin 16 is in faulty condition, ensuring power saving when dumbbell pin 16 can be used normally, thereby ensuring that battery 15 has enough power to supply the second tag 14 under faulty condition, so that the second tag 14 can continuously send signals to the reader, maintain power supply for a longer time, and ensure that the reader can continuously read the information of the second tag 14.

[0051] Specifically, two lines are drawn from both sides of the switch 13. One line is connected to the positive terminal of the battery 15, and the other line is connected to the positive terminal of the power supply of the second tag 14. A line drawn from the negative terminal of the second tag 14 is connected to the negative terminal of the battery 15, so that when the switch 13 is turned on, a power circuit is formed, thereby powering the second tag 14 through the battery 15, enabling the reader to read the signal of the second tag 14.

[0052] In some examples, battery 15 is an R2032 type battery that provides 3V power to the second tag 14 when switch 13 is turned on.

[0053] In one feasible implementation, the first tag 12 is a passive RFID tag; the second tag 14 is an active RFID tag, the second tag 14 includes a transmitter chip, which sends a signal to the reader when the switch 13 is turned on.

[0054] In this technical solution, the active RFID tag signal is more significant than the passive RFID tag signal. When the dumbbell pin 16 fails, the switch 13 automatically turns on, and the battery 15 powers the second tag 14, enabling the reader to read the signal of the second tag 14 based on the signal of the first tag 12. The reader uses the expression of the signal content of the second tag 14 as the main basis for judging the failure of the dumbbell pin 16, ensuring the reliability and effectiveness of the judgment result of the failure of the dumbbell pin 16.

[0055] Specifically, the first tag 12 is an ultra-high frequency passive RFID tag, the second tag 14 is an active RFID tag with a built-in wireless radio frequency transmitter chip, and the reader is an RFID reader.

[0056] In some examples, the second tag 14 has a built-in SI24R2 type 2.4GHz wireless radio frequency transmitter chip, which can send signals to the reader when powered on.

[0057] like Figure 3 As shown, in one feasible embodiment, the dumbbell pin 16 includes: a pin 161, two hammers 162 and two stops 163; the hammers 162 are disposed at both ends of the pin 161, and the housing 11 is disposed on the hammers 162; the stops 163 are located on the side of the hammers 162 away from the middle of the pin 161, and the stops 163 are detachably connected to the pin 161.

[0058] In this technical solution, the pin 161 and the two hammers 162 are an integral structure. The two hammers 162 at both ends of the pin 161 are respectively embedded in the dumbbell pin 16 grooves of the two mating central slots. The engagement of the hammers 162 with the dumbbell pin 16 grooves serves to limit the axial movement of the dumbbell pin 16 body. The stop block 163 is detachably mounted on the pin 161. By installing the stop block 163 on the pin 161 and making the height of the stop block 163 greater than the height of the hammers 162, the stop block 163 engages with the dumbbell pin 16 grooves in a direction perpendicular to the axis of the dumbbell pin 16 body to limit the movement of the dumbbell pin 16 body and prevent the dumbbell pin 16 body from coming out of the dumbbell pin 16 grooves due to large-angle rotation. The outer casing 11 is mounted on the hammer head 162. On the one hand, according to force analysis, the sensor mounted on the hammer head 162 has a relatively small impact on the force on the dumbbell pin 16, making the dumbbell pin 16 less prone to damage and ensuring that the original structural strength of the dumbbell pin 16 is not compromised after the sensor is installed. On the other hand, when the stop block 163 falls off and the hammer head 162 and the pin rod 161 do not leave the dumbbell pin 16 groove, the sensor on the hammer head 162 will not leave the metal environment provided by the metal part. Only when the hammer head 162 also leaves the dumbbell pin 16 groove and the sensor leaves the metal environment will it be detected by the sensor. The trigger condition for judging the fault is that the dumbbell pin 16 falls off the dumbbell pin 16 groove due to the failure of the stop block 163. The sensor can quickly detect the fault of the dumbbell pin 16 falling off the dumbbell pin 16 groove due to the failure of the stop block 163, thereby improving the monitoring sensitivity of the dumbbell pin 16 falling off due to the failure of the stop block 163.

[0059] Understandably, after the stop 163 falls off, without the limit provided by the stop 163, the hammer 162 and pin 161 of the dumbbell pin 16 can easily come out of the slot of the dumbbell pin 16. By setting the sensor on the hammer 162, and using the hammer 162 of the dumbbell pin 16 coming out of the slot of the dumbbell pin 16 as the trigger condition for judging the fault, that is, the two middle slots completely lose the limit provided by the dumbbell pin 16, the fault trigger condition is more universal, which can improve the accuracy and reliability of the fault monitoring and judgment results.

[0060] like Figure 3 As shown, in one feasible embodiment, the hammer head 162 is provided with a mounting groove, and the outer shell 11 is embedded in the mounting groove.

[0061] In this technical solution, the hammer head 162 is provided with a mounting groove, and the sensor is embedded in the mounting groove, that is, the sensor is embedded inside the hammer head 162. This avoids damage to the sensor during the contact and compression process between the hammer head 162 and the central groove, resulting in a longer service life for the sensor, ensuring the structural reliability of the sensor, and realizing continuous monitoring of the status of the dumbbell pin 16.

[0062] In one feasible implementation, the dumbbell pin 16 is installed in the dumbbell pin 16 groove of the central slot, and a metal part is provided in the dumbbell pin 16 groove, with the switch 13 located near the metal part.

[0063] In this technical solution, after the sensor is assembled, it is installed on the dumbbell pin 16, which is installed in the dumbbell pin 16 groove of the middle slot. The inside of the dumbbell pin 16 groove is provided with a metal part, so that the position of the switch 13 in the dumbbell pin 16 groove is a metal environment. The switch 13 is controlled to open or close by the position between the metal part and the switch 13, thereby determining whether the dumbbell pin 16 is faulty by the position of the sensor and disengaging it from the middle slot.

[0064] like Figure 4 As shown, in one feasible embodiment, the switch 13 is a magnetic switch, and a magnetic body 131 is provided inside the switch 13. The magnetic body 131 is attracted by the metal part, so that the switch 13 is in the closed state.

[0065] In this technical solution, switch 13 corresponds to the metal part in the groove of dumbbell pin 16. The metal part attracts the magnetic body 131, causing the magnetic body 131 to approach the metal part, thus putting switch 13 in the closed state. When dumbbell pin 16 disengages from the middle groove, the magnetic body 131 of the sensor disengages from the metal part. The metal part can no longer attract the magnetic body 131, causing the magnetic body 131 to reset and the switch 13 to open. The disengagement of dumbbell pin 16 from the groove of dumbbell pin 16 is used as the trigger condition for judging the fault. The fault trigger condition is more universal, thereby improving the accuracy and reliability of the fault judgment result.

[0066] Furthermore, when the dumbbell pin 16 breaks, or the stops 163 at both ends of the dumbbell pin 16 fall off, or the dumbbell pin 16 comes out of the dumbbell pin 16 groove due to other faults, the sensor detaches from the metal part, the attraction condition of the magnetic body 131 disappears, and the switch 13 is turned on.

[0067] like Figure 4As shown, in one feasible embodiment, the switch 13 further includes: an elastic element 132, a housing 133, a base 134, and a contact 135; the first end of the elastic element 132 is fixed to the magnetic body 131; the housing 133 covers the outside of the magnetic body 131, and the housing 133 is connected to the second end of the elastic element 132; the base 134 is disposed on the side of the magnetic body 131 away from the elastic element 132, and the base 134 is connected to the housing 133; the contact 135 is disposed on the side of the base 134 near the magnetic body 131, and when the contact 135 contacts the magnetic body 131, the switch 13 is turned on.

[0068] In this technical solution, the housing 133 is connected to the base 134, and the magnetic body 131 is disposed inside the housing 133. The magnetic body 131 has a contact 135 on the side surface near the base 134, and an elastic element 132 is connected to the side surface of the magnetic body 131 away from the base 134. When the magnetic attraction between the metal part and the magnetic body 131 is less than the restoring force of the elastic element 132, the elastic element 132 applies a pushing force to the magnetic body 131, so that the magnetic body 131 can be tightly attached to the two contacts 135 of the positive and negative poles, and the two contacts 135 are connected, thereby turning on the switch 13 and turning on the switch 13, so that the switch 13 is in the on state.

[0069] Furthermore, a conical positioning groove is provided on the side of the magnetic body 131 facing away from the base 134. The elastic element 132 is conical and matches the positioning groove. The small end of the elastic element 132 is embedded in the positioning groove to ensure the stability of the contact between the magnetic body 131 and the elastic element 132.

[0070] Furthermore, a guide rod is provided inside the housing 133 along the axial direction of the housing 133. When the elastic element 132 and the magnetic body 131 are installed in place, the guide rod can pass through the elastic element 132 and the magnetic body 131 to guide the movement of the magnetic body 131 and ensure the smoothness of the movement of the magnetic body 131.

[0071] In one feasible implementation, when the switch 13 is near the metal part, the metal part attracts the magnetic body 131, causing the magnetic body 131 to separate from the contact 135, and the switch 13 is closed; when the switch 13 is separated from the metal part, the magnetic body 131 contacts the contact 135 under the action of the elastic member 132, and the switch 13 is opened.

[0072] In this technical solution, when the dumbbell pin 16 is installed in the dumbbell pin 16 groove, the magnetic body 131 is located near the metal part. The metal part attracts the magnetic body 131 to the metal part and compresses the elastic member 132, causing the magnetic body 131 to separate from the contact 135. At this time, the switch 13 is in the off state. When the dumbbell pin 16 is disengaged from the dumbbell pin 16 groove, the magnetic body 131 moves away from the metal part, the attraction of the metal part to the magnetic body 131 disappears, the elastic member 132 recovers its elastic deformation, and pushes the magnetic body 131 to move towards the contact 135, so that the magnetic body 131 and the contact 135 are in contact. At this time, the switch 13 is in the on state, and the switch 13 is open.

[0073] like Figure 4 As shown, in one feasible embodiment, at least two contacts 135 are symmetrically arranged on the base 134, and the contacts 135 extend circumferentially along the magnetic body 131.

[0074] In this technical solution, after the switch 13 is assembled, under the condition that it is not affected by the outside world, the elastic element 132 can press the magnetic body 131 tightly onto the contact 135 of the base 134, so that the magnetic body 131 and the contact 135 are in contact. At this time, the magnetic body 131 acts as a conductor, connecting the two contacts 135 on the base 134, so that the switch 13 is in the conducting state, that is, the switch 13 is open. By extending the contact 135 along the circumference of the magnetic body 131, it is ensured that the contact 135 and the magnetic body 131 can make full contact, preventing disconnection and ensuring the stability of the switch 13 after it is turned on.

[0075] Furthermore, a wiring portion is provided on the contact 135, which extends outward from the center of the base 134 to the outside of the magnet 131 and the housing 133 to facilitate wiring on the switch 13.

[0076] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0077] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A dumbbell pin status monitoring sensor, characterized in that, The dumbbell pin status monitoring sensor includes: shell; A first tag is disposed inside the housing and is electrically connected to a reader / writer, which is capable of reading the first tag. A switch, wherein the switch is disposed within the housing; The second tag is disposed inside the housing and is electrically connected to the switch. When the switch is turned on, the second tag is connected to the reader for reading. The dumbbell pin is installed in the dumbbell pin slot of the middle groove, and a metal part is provided in the dumbbell pin slot. The switch is located near the metal part. When the dumbbell pin is installed in the dumbbell pin slot, the switch is in the off state. When the dumbbell pin is removed from the dumbbell pin slot, the switch is in the on state and the switch is turned on. The switch includes: A magnetic body is attracted by the metal part, thus putting the switch in the closed state; An elastic element, the first end of which is fixed to the magnetic body; A housing, which covers the outside of the magnetic body and is connected to the second end of the elastic member; A base is disposed on the side of the magnet away from the elastic element, and the base is connected to the housing; The contact is disposed on the side of the base near the magnetic body, and the switch is turned on when the contact contacts the magnetic body; When the switch is near the metal part, the metal part attracts the magnetic body, causing the magnetic body to separate from the contact, and the switch is turned off; When the switch is separated from the metal part, the magnetic body contacts the contact point under the action of the elastic element, the switch is turned on, and the reader reads the first tag and the second tag at the same time.

2. The dumbbell pin status monitoring sensor according to claim 1, characterized in that, The dumbbell pin status monitoring sensor also includes: A battery is disposed inside the housing and is electrically connected to the second tag and the switch; when the switch is turned on, a power circuit is formed, enabling the battery to supply power to the second tag.

3. The dumbbell pin status monitoring sensor according to claim 2, characterized in that, The first tag is a passive RFID tag; The second tag is an active RFID tag, and the second tag includes a transmitter chip, which sends a signal to the reader when the switch is turned on.

4. The dumbbell pin status monitoring sensor according to claim 1, characterized in that, The dumbbell pin includes: Pin; Two hammerheads are disposed at both ends of the pin, and the housing is disposed on the hammerheads; Two stops are provided, the stops being located on the side of the hammer head away from the middle of the pin, and the stops being detachably connected to the pin.

5. A dumbbell pin status monitoring sensor according to claim 1, characterized in that, At least two contacts are symmetrically arranged on the base, and the contacts extend circumferentially along the magnetic body.

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