Monitoring sensor for a petal contact and petal contact assembly

Abstract

The utility model provides a kind of monitoring sensor of plum blossom contact and plum blossom contact assembly, the monitoring sensor includes shell, shell is provided with circuit cavity, circuit cavity is installed with circuit board, and circuit board is provided with temperature measurement probe component;Temperature measurement probe component includes temperature measurement head and spring piece, the first end of spring piece is connected with temperature measurement head, the second end of spring piece is fixed on circuit board, temperature measurement head moves along the telescopic direction of spring piece;Shell is provided with probe through-hole, probe through-hole is communicated with circuit cavity, temperature measurement head is located in probe through-hole and moves, and the first end of temperature measurement head is exposed in probe through-hole, and the first end of temperature measurement head is used for abutting the component to be measured temperature.The plum blossom contact assembly applies the monitoring sensor of this plum blossom contact.The monitoring sensor of plum blossom contact of the utility model can improve the closeness of temperature measurement probe and the component to be measured temperature, and guarantee temperature detection precision.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, specifically to a monitoring sensor with a plum blossom contact, and also to a plum blossom contact assembly of the monitoring sensor using the plum blossom contact. Background Technology

[0002] The safe operation of switchgear in power equipment has always been a key focus for industry professionals. The safe operation of high-voltage switchgear is one such focus. The healthy operating status of high-voltage switchgear is mainly reflected in the contact points between the circuit breaker's sprite contacts and stationary contacts. Poor contact due to wear and aging during insertion and removal, or overload current causing rapid heating of the connecting parts, can lead to spontaneous combustion and explosion, resulting in significant economic losses. Therefore, monitoring the operating status of circuit breaker sprite contacts using sensors is a common method.

[0003] In existing sensors, temperature probes are typically positioned near the contacts of the L-shaped contact to monitor their temperature. However, these probes are usually fixed to the sensor housing and their position cannot be adjusted. Furthermore, when mounting the sensor on the L-shaped contact, installation or manufacturing defects may prevent the temperature probe from fitting perfectly with every contact finger. Poor fit can lead to reduced temperature detection accuracy and, in severe cases, safety hazards.

[0004] Therefore, it is necessary to consider more optimized monitoring sensors. Utility Model Content

[0005] The primary objective of this invention is to provide a monitoring sensor with a plum blossom contact that can improve the proximity between the temperature probe and the component to be measured, thereby ensuring the accuracy of temperature detection.

[0006] The second objective of this invention is to provide a plum blossom contact assembly that can improve the proximity between the temperature probe and the component to be measured, thereby ensuring the accuracy of temperature detection.

[0007] To achieve the aforementioned first objective, the monitoring sensor for the plum blossom contact provided by this utility model includes a housing, a circuit cavity, a circuit board installed inside the circuit cavity, and a temperature probe assembly on the circuit board. The temperature probe assembly includes a temperature measuring head and a spring component. The first end of the spring component is connected to the temperature measuring head, and the second end of the spring component is fixed to the circuit board. The temperature measuring head moves along the extension and retraction direction of the spring component. A probe through hole is provided on the housing, which communicates with the circuit cavity. The temperature measuring head moves within the probe through hole, and the first end of the temperature measuring head is exposed outside the probe through hole. The first end of the temperature measuring head is used to abut against the receiving temperature measuring component.

[0008] As can be seen from the above solution, in the monitoring sensor of the plum blossom contact of this utility model, the temperature probe assembly is equipped with a spring component. One end of the spring component is fixed to the circuit board, and the other end is connected to the temperature probe. The elastic deformation ensures that the temperature probe always maintains a tight contact with the temperature-sensing component, avoiding temperature measurement errors caused by poor contact and ensuring data accuracy. Furthermore, the temperature probe directly contacts the plum blossom contact, directly obtaining the true temperature of the contact surface, reducing heat conduction loss and improving detection accuracy.

[0009] In a further embodiment, the temperature sensor head includes a metal part and a temperature sensing element. The metal part is connected to the first end of the spring part. The first end of the metal part is provided with a mounting hole. The temperature sensing element is installed in the mounting hole and is electrically connected to the circuit board.

[0010] Therefore, by incorporating a metal component, the temperature sensor can directly contact the component being measured. Utilizing the high thermal conductivity of metal, the temperature of the sensor surface is rapidly transferred to the sensing element, reducing the delay in the heat conduction path and making the measured temperature data closer to real-time temperature changes. Simultaneously, the sensing element is installed within the mounting hole of the metal component, ensuring tight contact between the element and the metal, preventing displacement due to vibration or long-term use, and avoiding measurement errors caused by poor contact.

[0011] In a further embodiment, the spring component is a cylindrical spring; the second end of the cylindrical spring is provided with at least two solder feet, which are evenly arranged along the circumference of the cylindrical spring; all solder feet are soldered onto the circuit board.

[0012] Therefore, the helical design of the cylindrical spring enables it to produce linear elastic deformation in the direction of extension and contraction, providing constant contact pressure and ensuring that the temperature sensor continuously contacts the receiving component. Simultaneously, the presence of at least two solder feet to distribute stress, with the solder feet evenly soldered onto the circuit board along the circumference of the cylindrical spring, transforms the radial force during spring extension and contraction into a balanced circumferential force. This prevents solder joint cracking caused by stress concentration at a single point of welding, improving the reliability of the temperature sensor assembly.

[0013] In a further design, a limiting groove is provided on the outside of the housing, which is used to limit the movement of the finger of the Phillips-shaped contact.

[0014] Therefore, by setting a limiting groove and a contact finger limiting mechanism, the groove shape of the limiting groove matches the contour of the contact finger. During installation, the contact finger is embedded in the limiting groove to prevent the product from rotating, ensuring that the temperature measuring head and the contact finger are in contact, thus improving the accuracy of the measurement.

[0015] In a further design, the probe through-hole is located at the bottom of the limiting groove.

[0016] Therefore, by placing the probe through-hole at the bottom of the limiting groove, poor contact between the temperature measuring head and the part being measured due to misalignment can be further avoided. At the same time, the limiting groove can also partially shield the probe through-hole, reducing the intrusion of foreign objects.

[0017] In a further design, the housing is provided with a mounting position that mates with the plum blossom contact, and the temperature measuring head is located within the mounting position.

[0018] Therefore, by placing the temperature sensor in the mounting position, installation can be facilitated, and the temperature sensor can be made to contact the contact finger of the plum blossom contactor.

[0019] In a further embodiment, the housing includes a first semi-ring housing and a second semi-ring housing, which are connected by a telescopic structure. Both the first and second semi-ring housings are provided with at least two inwardly snapping catches, which are arranged along the outer periphery of the housing. The catches form an installation position, and the telescopic structure is used to adjust the size of the installation position.

[0020] Therefore, the housing is designed with a first and second semi-ring shell connected by a telescopic structure, which allows for adjustment of the distance between the first and second semi-ring shells. This enables the inner diameter of the ring formed by the clamp to change steplessly within a certain range, precisely matching the outer diameter of the stud contacts from different manufacturers. Operators do not need to obtain the specific contact size data in advance; they only need to align the clamp with the contact and manually adjust it through the telescopic structure until the clamp firmly locks the contact flange or outer wall, thus improving installation efficiency.

[0021] In a further embodiment, the telescopic structure includes a connecting boss and a boss receiving position, the connecting boss being telescopically adjustable and inserted into the boss receiving position; the first semi-annular housing is provided with a first connecting end and a second connecting end, and the second semi-annular housing is provided with a third connecting end and a fourth connecting end; the first connecting end and the third connecting end are connected by a telescopic structure, one of the first connecting end and the third connecting end is provided with a connecting boss, and the other is provided with a boss receiving position; the second connecting end and the fourth connecting end are connected by a telescopic structure, one of the second connecting end and the fourth connecting end is provided with a connecting boss, and the other is provided with a boss receiving position.

[0022] Therefore, the telescopic structure, through the connection boss and boss receiving position, can dynamically adjust the combined inner diameter of the two semi-annular shells, ensuring that the sensor can tightly wrap around contacts of different sizes. This avoids problems such as monitoring data deviation due to excessive looseness or installation failure due to excessive tightness. Furthermore, the symmetrical double telescopic structure connecting the first and second semi-annular shells forms a stable support frame, preventing sensor deflection due to contact vibration or installation stress. This ensures that the two semi-annular shells maintain coaxial movement during opening and closing, preventing axial misalignment.

[0023] In a further embodiment, the connecting boss is provided with a spring groove, and a compression spring is installed in the spring groove; a spring stop is provided at the boss receiving position, and the spring stop can be movably inserted into the spring groove and is located on the first side close to the spring groove; the first end of the compression spring abuts against the spring stop, and the second end of the compression spring abuts against the second side of the spring groove.

[0024] Therefore, by setting a compression spring, with its first end abutting against the spring stop and its second end abutting against the second side of the spring groove, installation is facilitated. The compression spring provides preload, automatically causing the first and second semi-ring housings to contract and secure the contacts, eliminating the need for manual adjustment of knobs or clips and improving installation efficiency. Furthermore, during the operation of electrical equipment, the contacts experience temperature fluctuations due to load changes, causing the outer diameter to expand or contract accordingly. The spring-type structure dynamically compensates for these dimensional changes through elastic expansion and contraction, avoiding the loosening or over-tightening problems caused by thermal expansion and contraction in traditional rigid clamps.

[0025] To achieve the second objective of this utility model, this utility model provides a plum blossom contact assembly, including a plum blossom contact and a monitoring sensor, wherein the monitoring sensor is mounted on the plum blossom contact; the monitoring sensor adopts the aforementioned monitoring sensor. Attached Figure Description

[0026] Figure 1 This is a structural diagram of an embodiment of the plum blossom contact assembly of this utility model.

[0027] Figure 2 This is a structural diagram of the plum blossom contact and the monitoring sensor in the disassembled state in an embodiment of the plum blossom contact assembly of this utility model.

[0028] Figure 3 This is a structural diagram of the monitoring sensor in an embodiment of the plum blossom contact assembly of this utility model.

[0029] Figure 4 This is an exploded view of the monitoring sensor in an embodiment of the plum blossom contact assembly of this utility model.

[0030] Figure 5 This is a structural diagram of the monitoring sensor after the first and second bottom shells are hidden in an embodiment of the plum blossom contact assembly of this utility model.

[0031] Figure 6 This is a structural diagram of the first upper shell and the second upper shell of the monitoring sensor in the retracted state in an embodiment of the plum blossom contact assembly of this utility model.

[0032] Figure 7 This is a structural diagram of the first upper shell and the second upper shell of the monitoring sensor in a stretched state in an embodiment of the plum blossom contact assembly of this utility model.

[0033] Figure 8 This is a structural diagram of the monitoring sensor under tension in an embodiment of the plum blossom contact assembly of this utility model.

[0034] Figure 9 This is a structural diagram of the temperature probe assembly and circuit board in the installation state of the plum blossom contact assembly embodiment of this utility model.

[0035] Figure 10 This is an exploded view of the temperature probe assembly in an embodiment of the plum blossom contact assembly of this utility model.

[0036] Figure 11 This is a structural cross-sectional view of the temperature probe assembly in an embodiment of the plum blossom contact assembly of this utility model.

[0037] Figure 12 yes Figure 1 Enlarged view of point A in the middle.

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0039] Example of a plum blossom contact assembly:

[0040] like Figure 1 and Figure 2 As shown, in this embodiment, the plum blossom contact assembly includes a plum blossom contact 1 and a monitoring sensor 2 for the plum blossom contact. The plum blossom contact 1 is provided with multiple contact fingers 11, and a spring coil 12 is fitted onto the upper end of each contact finger 11. The spring coil 12 is used to tighten the contact fingers 11. The specific structure of the plum blossom contact 1 is a structure known to those skilled in the art and will not be described in detail here. The monitoring sensor 2 for the plum blossom contact is installed at the upper end of the plum blossom contact 1 and is used to monitor the plum blossom contact 1 for temperature measurement, partial discharge, pressure, tension, distance measurement, etc. In this embodiment, the monitoring sensor 2 for the plum blossom contact is used to monitor the temperature of the plum blossom contact 1.

[0041] In this embodiment, see Figure 3 and Figure 4 The monitoring sensor 2 of the plum blossom contact is equipped with an annular housing, which is made of high-temperature resistant insulating material. The annular housing is made of high-temperature resistant insulating material, which can meet the requirements of high voltage insulation and explosion protection, and avoid the risk of electrical accidents.

[0042] The annular housing includes a first semi-annular housing 21 and a second semi-annular housing 22, which are connected by a telescopic structure. Both the first semi-annular housing 21 and the second semi-annular housing 22 are provided with at least two inwardly engaged latches 23, which are arranged along the outer periphery of the annular housing. The annular housing has a mounting position for engaging with the sprite-shaped contact 1, with the latches 23 forming the mounting position. The telescopic structure is used to adjust the size of the mounting position for the latches 23. When the monitoring sensor 2 of the sprite-shaped contact is mounted on the sprite-shaped contact 1, the latches 23 engage with the spring coil 12. Preferably, the latches 23 extend from the bottom of the annular housing and are integrally formed with the annular housing, creating a rigid whole and preventing the latches 23 from falling off or deforming.

[0043] In this embodiment, the first semi-annular housing 21 includes a first upper housing 211 and a first bottom housing 212, which are detachably installed. The second semi-annular housing 22 includes a second upper housing 221 and a second bottom housing 222, which are also detachably installed.

[0044] In this embodiment, the telescopic structure includes a connecting boss 24 and a boss receiving position 25. The connecting boss 24 is telescopically and adjustablely inserted into the boss receiving position 25. The telescopic structure, through the cooperation of the connecting boss 24 and the boss receiving position 25, can dynamically adjust the combined inner diameter of the two semi-annular housings, ensuring that the sensor can tightly wrap around contacts of different sizes, avoiding problems such as monitoring data deviation due to excessive looseness or installation failure due to excessive tightness.

[0045] The first semi-annular housing 21 is provided with a first connecting end 26 and a second connecting end 27, and the second semi-annular housing 22 is provided with a third connecting end 28 and a fourth connecting end 29. The first connecting end 26 and the third connecting end 28 are connected by a telescopic structure. One of the first connecting end 26 and the third connecting end 28 is provided with a connecting boss 24, and the other is provided with a boss receiving position 25. The second connecting end 27 and the fourth connecting end 29 are connected by a telescopic structure. One of the second connecting end 27 and the fourth connecting end 29 is provided with a connecting boss 24, and the other is provided with a boss receiving position 25. In this embodiment, the first connecting end 26 and the second connecting end 27 are provided with a boss receiving position 25, and the third connecting end 28 and the fourth connecting end 29 are provided with a connecting boss 24. The first semi-annular housing 21 and the second semi-annular housing 22 are connected by a symmetrical double telescopic structure at both ends, forming a stable support frame. This prevents the sensor from deflecting due to contact vibration or installation stress, and ensures that the two semi-annular housings maintain coaxial movement during opening and closing, avoiding axial offset.

[0046] In this embodiment, see Figure 5 , Figure 6 and Figure 7The connecting boss 24 is provided with a spring groove 241, and a compression spring 242 is installed in the spring groove 241. The boss receiving position 25 is provided with a spring stop 251, which is movably inserted into the spring groove 241 and located on the first side near the spring groove 241. The first end of the compression spring 242 abuts against the spring stop 251, and the second end of the compression spring 242 abuts against the second side of the spring groove 241. By providing the compression spring 242, with its first end abutting against the spring stop 251 and its second end abutting against the second side of the spring groove 241, it is convenient to use the preload provided by the compression spring 242 during installation to automatically contract the first half-ring housing 21 and the second half-ring housing 22, thereby locking the contacts. This eliminates the need for manual adjustment of knobs or clips, improving installation efficiency. Simultaneously, during the operation of the power equipment, the contacts will experience temperature fluctuations due to load changes, causing the outer diameter to expand or contract accordingly. The spring-type structure dynamically compensates for dimensional changes through elastic expansion and contraction, avoiding the loosening or over-tightening problems caused by thermal expansion and contraction in traditional rigid clamps.

[0047] In this embodiment, the first semi-annular housing 21 is provided with a first circuit cavity 213, which is formed by the cooperation of a first upper housing 211 and a first bottom housing 212. The second semi-annular housing 22 is provided with a second circuit cavity 223, which is formed by the cooperation of a second upper housing 221 and a second bottom housing 222. The connecting boss 24 is provided with a circuit through groove 243, through which the first circuit cavity 213 and the second circuit cavity 223 are connected. The connecting boss 24, by providing a circuit through groove 243, connects the first circuit cavity 213 and the second circuit cavity 223, which can prevent the first semi-annular housing 21 and the second semi-annular housing 22 from damaging the circuit during movement. The first circuit cavity 213 and the second circuit cavity 223 cooperate to form a circuit cavity for accommodating the circuit board 4. A magnetic ring 5 and a coil (not shown) for power extraction are also provided in the circuit cavity. Power is extracted by induction through the magnetic ring 5 and the coil, which can realize the passive setting of the sensor and facilitate installation.

[0048] In this embodiment, see Figure 8 At least a portion of the circuit channel 243 is a sealed section 2431. The sealed section 2431 is used to prevent the circuit channel 243 from being exposed when the first semi-annular housing 21 and the second semi-annular housing 22 are in a stretched state. By providing the sealed section 2431, the circuit channel 243 can be prevented from being exposed, effectively blocking rainwater, condensation, and dust from entering the circuit channel 243, and preventing short circuits or corrosion of the wires. At the same time, it prevents external high-voltage electricity from affecting the circuit in the circuit channel 243.

[0049] In this embodiment, see Figure 9 The circuit board 4 is equipped with a temperature probe assembly 6, which is used to monitor the temperature of the finger 11 in the plum blossom contact 11.

[0050] See Figure 10 and Figure 11 The temperature probe assembly 6 includes a temperature probe 61 and a spring 62. The first end of the spring 62 is connected to the temperature probe 61, and the second end of the spring 62 is fixed to the circuit board 4. The temperature probe 61 moves along the extension / retraction direction of the spring 62. Figure 8 It is known that a probe through hole 2221 is provided on the second bottom shell 222. The probe through hole 2221 is connected to the circuit cavity. The temperature measuring head 61 moves inside the probe through hole 2221 and the first end of the temperature measuring head 61 is exposed outside the probe through hole 2221. The first end of the temperature measuring head 61 is used to abut against the temperature measuring component. In this embodiment, the temperature measuring component is the touch finger 11, and the first end of the temperature measuring head 61 abuts against the top 111 of the touch finger 11.

[0051] In this embodiment, the spring 62 is a cylindrical spring. The second end of the cylindrical spring has at least two solder feet 621, which are evenly arranged along the circumference of the spring. All solder feet 621 are soldered onto the circuit board 4. The helical design of the cylindrical spring allows it to produce linear elastic deformation in the extension and contraction direction, providing constant contact pressure and ensuring that the temperature sensor 61 continuously contacts the receiving temperature component. Simultaneously, the presence of at least two solder feet 621 disperses stress, and the even soldering of the solder feet 621 onto the circuit board 4 along the circumference of the cylindrical spring converts the radial force during spring extension and contraction into a balanced circumferential force, preventing solder joint cracking due to stress concentration at a single point of welding and improving the reliability of the temperature sensor 61 assembly.

[0052] In this embodiment, the temperature measuring head 61 includes a metal part 611 and a temperature measuring element 612. The metal part 611 is connected to the first end of the spring part 62. The first end of the metal part 611 is provided with a mounting hole 6111, and the temperature measuring element 612 is installed in the mounting hole 6111. The temperature measuring element 612 is electrically connected to the circuit board 4. Preferably, the metal part 611 is made of copper or aluminum. By providing the metal part 611, the temperature measuring head 61 can directly contact the part to be measured. Utilizing the high thermal conductivity of the metal, the temperature of the contact surface can be quickly conducted to the temperature measuring element 612, reducing the delay of the heat conduction path and making the temperature measurement data closer to the real-time temperature change. At the same time, the temperature measuring element 612 is installed in the mounting hole 6111 of the metal part 611, which can ensure that the element and the metal part 611 are in close contact, avoiding displacement caused by vibration or long-term use, and preventing temperature measurement errors caused by poor contact.

[0053] Depend on Figure 8 It is also known that a limiting groove 2222 is provided on the outside of the second bottom shell 222. In this embodiment, the limiting groove 2222 is formed by the cooperation of a first limiting rib 2223 and a second limiting rib 2224, and the first limiting rib 2223 and the second limiting rib 2224 are arranged in parallel. See Figure 12The limiting groove 2222 is used to limit and cooperate with the contact finger 11 of the plum blossom contact 1. By setting the limiting groove 2222 to limit and cooperate with the contact finger 11, the groove shape of the limiting groove 2222 is adapted to the contour of the contact finger 11. During installation, the contact finger 11 is embedded in the limiting groove 2222, preventing the product from rotating and ensuring that the temperature measuring head 61 abuts against the contact finger 11, thereby improving the accuracy of temperature measurement. In this embodiment, the probe through hole 2221 is located at the bottom of the limiting groove 2222. By setting the probe through hole 2221 at the bottom of the limiting groove 2222, poor contact between the temperature measuring head 61 and the part to be measured due to misalignment can be further avoided. At the same time, the limiting groove 2222 can also block the probe through hole 2221 to a certain extent, reducing the intrusion of foreign objects.

[0054] In this embodiment, during installation of the monitoring sensor with the plum blossom contact, firstly, the first semi-ring housing 21 and the second semi-ring housing 22 are manually pulled apart, so that the first semi-ring housing 21 and the second semi-ring housing 22 are in a stretched state, as shown below. Figure 8 The state shown is as follows. Next, the monitoring sensor of the plum blossom contact is clipped onto the top of the plum blossom contact 1, and the temperature probe assembly 6 is made to abut the top of any one set of contact fingers 11. Then, the pulling force is released, so that the clamp 23 engages with the spring coil 12, thereby completing the installation.

[0055] As described above, in the monitoring sensor of the plum blossom contact of this utility model, the temperature probe assembly 6 is equipped with a spring member 62. One end of the spring member 62 is fixed to the circuit board 4, and the other end is connected to the temperature measuring head 61. The elastic deformation ensures that the temperature measuring head 61 can always tightly contact the temperature measuring component, avoiding temperature measurement errors caused by poor contact and ensuring data accuracy. Moreover, the temperature measuring head 61 directly contacts the plum blossom contact, directly obtaining the true temperature of the contact surface, reducing heat conduction loss and improving detection accuracy.

[0056] It should be noted that the above are only preferred embodiments of the present utility model, but the design concept of the utility model is not limited thereto. Any non-substantial modifications made to the present utility model using this concept shall also fall within the protection scope of the present utility model.

Claims

1. A monitoring sensor for a plum blossom contact, comprising a housing, wherein the housing has a circuit cavity, a circuit board is mounted within the circuit cavity, and a temperature probe assembly is mounted on the circuit board; characterized in that: The temperature probe assembly includes a temperature probe and a spring component. The first end of the spring component is connected to the temperature probe, and the second end of the spring component is fixed on the circuit board. The temperature probe moves along the extension and retraction direction of the spring component. The housing is provided with a probe through hole, which is connected to the circuit cavity. The temperature measuring head moves within the probe through hole, and the first end of the temperature measuring head is exposed outside the probe through hole. The first end of the temperature measuring head is used to abut against the receiving temperature measuring component.

2. The monitoring sensor for the plum blossom contact as described in claim 1, characterized in that: The temperature measuring head includes a metal part and a temperature measuring element. The metal part is connected to the first end of the spring part. The first end of the metal part is provided with a mounting hole. The temperature measuring element is installed in the mounting hole and is electrically connected to the circuit board.

3. The monitoring sensor for the plum blossom contact as described in claim 1, characterized in that: The spring component is a cylindrical spring; The second end of the cylindrical spring is provided with at least two welding feet, and the at least two welding feet are evenly arranged along the circumference of the cylindrical spring. All of the aforementioned solder feet are soldered onto the circuit board.

4. The monitoring sensor for the plum blossom contact according to any one of claims 1 to 3, characterized in that: The outer surface of the housing is provided with a limiting groove, which is used to limit the movement of the finger of the plum blossom contact.

5. The monitoring sensor for the plum blossom contact according to claim 4, characterized in that: The probe through-hole is located at the bottom of the limiting groove.

6. The monitoring sensor for the plum blossom contact according to any one of claims 1 to 3, characterized in that: The housing is provided with a mounting position that mates with the plum blossom contact, and the temperature measuring head is located within the mounting position.

7. The monitoring sensor for the plum blossom contact according to claim 6, characterized in that: The housing includes a first semi-ring housing and a second semi-ring housing, which are connected by a telescopic structure. Both the first semi-annular shell and the second semi-annular shell are provided with at least two inwardly snapping catches, which are arranged along the outer periphery of the shell; The clamps form the mounting position, and the telescopic structure is used to adjust the size of the mounting position.

8. The monitoring sensor for the plum blossom contact according to claim 7, characterized in that: The telescopic structure includes a connecting boss and a boss receiving position, wherein the connecting boss is telescopically and adjustablely inserted into the boss receiving position. The first semi-ring housing is provided with a first connecting end and a second connecting end, and the second semi-ring housing is provided with a third connecting end and a fourth connecting end; The first connecting end and the third connecting end are connected by a telescopic structure, one of the first connecting end and the third connecting end is provided with the connecting boss, and the other is provided with the boss receiving position; The second connecting end and the fourth connecting end are connected by a telescopic structure. One of the second connecting end and the fourth connecting end is provided with a connecting boss, and the other is provided with a boss receiving position.

9. The monitoring sensor for the plum blossom contact according to claim 8, characterized in that: The connecting boss is provided with a spring groove, and a compression spring is installed in the spring groove; The boss receiving position is provided with a spring stop block, which can be movably inserted into the spring groove and is located on the first side close to the spring groove. The first end of the compression spring abuts against the spring stop, and the second end of the compression spring abuts against the second side of the spring groove.

10. A plum blossom contact assembly, comprising a plum blossom contact and a monitoring sensor, wherein the monitoring sensor is mounted on the plum blossom contact; characterized in that: The monitoring sensor for the plum blossom contact is the plum blossom contact monitoring sensor as described in any one of claims 1 to 9.

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