Ultra-small multi-contact measurement device

Abstract

This invention provides an ultra-small multi-contact measuring device, comprising upper and lower housings with hollow interiors and accommodating chambers, and a measuring assembly housed within both. The measuring assembly includes four transmission components, each with a uniquely shaped lever having at least three ends at different heights, enabling measurement of the inner diameter of a shaft hole from multiple directions. The staggered distribution of the third ends of the multiple uniquely shaped levers avoids interference and improves measurement accuracy. A protrusion on the upper housing facilitates insertion into the shaft hole, with the first end extending into the protrusion to accurately sense changes in the shaft hole's inner diameter. The sensing component incorporates a lifting structure, allowing for minute adjustments of the contacts to accommodate shaft holes of different sizes. The lower housing features a dust-blowing structure to keep the device clean and reduce operating temperature. Furthermore, a first locking screw ensures stable installation of the central rotating shaft, the L-shaped third end improves contact stability, and a spring forms an elastic reset system, enhancing measurement efficiency.

Description

Technical Field

[0001] This utility model relates to the field of measurement technology, and in particular to an ultra-small multi-contact measurement device. Background Technology

[0002] In many industrial fields such as machinery manufacturing and automotive parts production, the dimensional and shape accuracy of shaft holes has a crucial impact on the assembly quality and performance of components. Taking the fit between the crankshaft and the connecting rod big end of an engine as an example, the inner diameter, roundness, and center position of the shaft hole directly affect the smoothness of crankshaft operation and its service life. If the inner diameter of the shaft hole is too large or the roundness deviation is too large, it will lead to excessive clearance between the crankshaft and the connecting rod, resulting in greater vibration and noise during engine operation and accelerating the wear of components. Conversely, if the inner diameter of the shaft hole is too small, it will make the assembly of the crankshaft and connecting rod difficult or even impossible, seriously affecting production efficiency and product quality.

[0003] However, existing technologies for measuring shaft holes have many limitations.

[0004] Firstly, for some ultra-small (diameter less than 1 cm) shaft holes, and with many adjacent components nearby, due to space constraints, traditional probes cannot flexibly avoid surrounding parts. During operation, they are prone to collisions with surrounding parts, which can not only damage the probe and surrounding parts, but may also prevent the measurement work from proceeding normally and make it impossible to successfully penetrate into the shaft hole for measurement.

[0005] Secondly, existing probes typically use two-point measurement, which cannot simultaneously obtain multiple parameters of the small hole, such as inner diameter, roundness, and hole center position.

[0006] Thirdly, during the measurement process, the probe is easily affected by external factors, such as dust, iron filings, and other impurities adhering to the probe surface or entering the probe interior, affecting the accuracy of the measurement data. Moreover, existing probes lack effective protection and stabilization mechanisms in their structural design, making them prone to shaking or displacement during measurement, thus increasing measurement errors.

[0007] More significantly, existing probes become ineffective when there are many other components on the side of the small hole. Furthermore, the presence of surrounding components interferes with the probe's measurement signal, leading to inaccurate results and failing to provide reliable reference for actual production. Therefore, developing an ultra-small multi-contact measuring device that can adapt to confined spaces, effectively avoid surrounding components, and accurately measure the inner diameter, roundness, and center position parameters of a small hole is of significant practical importance.

[0008] Therefore, we propose an ultra-small multi-contact measuring device. Utility Model Content

[0009] Therefore, it is necessary to provide an ultra-small multi-contact measuring device to address the technical problems of existing ultra-small multi-contact measuring devices, such as their inability to adapt to confined spaces, difficulty in guaranteeing measurement accuracy, and susceptibility to interference from external factors during measurement. This device would be able to penetrate deep into confined shaft holes to accurately measure parameters such as the inner diameter and roundness of the holes, while effectively reducing the interference of external factors on measurement accuracy and improving the accuracy and reliability of the measurements.

[0010] This application provides an ultra-small multi-contact measuring device, including an upper housing with a hollow interior and a first accommodating chamber; a lower housing connected to the upper housing, also with a hollow interior and a second accommodating chamber; and a measuring assembly disposed within the upper and lower housings. The measuring assembly includes a transmission component and a sensing component. There are four transmission components, each including a shaped lever with at least three ends at different heights. This unique structural design enables the measurement of the inner diameter of the shaft hole from multiple directions, improving the comprehensiveness and accuracy of the measurement. Simultaneously, by utilizing the lever principle, the compression of the shaft hole inner wall against the first end is transformed into contact between the third end and the contact of the sensing component, achieving precise measurement. The device is simple in structure and highly reliable.

[0011] In other embodiments, the third ends of the irregular levers in the plurality of transmission components are staggered. This distribution allows the sensing components to be more evenly distributed around the ultra-small multi-contact measuring device, measuring the inner diameter of the shaft hole from multiple angles, improving the comprehensiveness and accuracy of the measurement, while avoiding interference between the various transmission components, ensuring that each transmission component works independently and stably, and also helping to reduce the overall size of the device and adapt to narrower shaft hole measurement environments.

[0012] In other embodiments, the upper housing includes a protrusion and a horizontal portion. The protrusion extends upward from the axis of the horizontal portion. Both the protrusion and the horizontal portion are cylindrical structures, and the diameter of the protrusion is smaller than the diameter of the horizontal portion. The side of the horizontal portion of the upper housing away from the protrusion is connected to the lower housing. The diameter of the protrusion is smaller than the inner diameter of the ultra-small hole, which facilitates the insertion of the device into the shaft hole, reduces friction with the inner wall of the shaft hole, reduces insertion resistance, improves measurement efficiency, and provides space for the extension of the first end. The horizontal portion plays a connecting and supporting role, and is connected with the lower housing to form a stable whole, providing a reliable mounting base for the internal measurement assembly. The cylindrical structure gives the device good guidance in the shaft hole.

[0013] In other embodiments, the first end of the irregular lever extends into the protrusion and moves radially along the protrusion. The second and third ends of the irregular lever are disposed in the first receiving chamber of the horizontal portion of the upper housing. The first end extends into the protrusion and moves radially, allowing it to directly contact the inner wall of the shaft hole and accurately sense changes in the inner diameter of the shaft hole. The protrusion provides independent space for its movement, reducing external interference. The second and third ends are disposed in the first receiving chamber, providing them with a stable operating environment, ensuring normal rotation of the irregular lever and accurate contact between the third end and the contact, improving measurement accuracy and reliability. At the same time, the first receiving chamber protects the irregular lever.

[0014] In other embodiments, the sensing component also includes a lifting structure comprising an air bladder and an air hole on the air bladder. The air bladder is connected to the contact and drives the contact to move axially. The sensing component is also connected to a sensor that senses changes in axial distance. The air bladder is inflated and deflated through the air hole. When inflated, it pushes the contact to move axially, lifting the third end and causing the first end to retract radially along the protrusion, facilitating insertion into ultra-small holes and avoiding damage to the first end. When deflated, the contact returns to its initial position under the action of other forces, and the third end resets under the action of a spring. This design allows the contact to be slightly adjusted in the axial direction to adapt to the measurement needs of shaft holes of different sizes. The sensor senses changes in the axial distance of the contact in real time and converts them into electrical signals, which are transmitted to the subsequent processing system to obtain accurate data on the inner diameter of the shaft hole. It has the advantages of fast response speed, high measurement accuracy, and good stability.

[0015] In other embodiments, the lower housing is a columnar structure, and the sensing component is disposed in the second accommodating cavity inside the lower housing. The second accommodating cavity inside the lower housing provides a dedicated installation space for the sensing component, so that the sensing component is in a relatively independent and stable environment, avoiding external collisions and interference, ensuring normal operation, and at the same time playing a certain role in heat dissipation for the sensing component, preventing it from affecting the measurement accuracy due to excessive temperature during long-term operation.

[0016] In other embodiments, a dust-blowing structure for blowing air upwards towards the upper housing is also provided on the axis of the lower housing. During the shaft hole measurement process, dust, iron filings, and other impurities may exist inside the shaft hole or on the transmission assembly. These impurities, when attached to the surface of the device or entering the measuring assembly, can affect the measurement accuracy and normal operation of the equipment. The dust-blowing structure blows air upwards towards the upper housing, forming a strong airflow that blows away the dust and impurities inside the shaft hole, keeping the device clean. At the same time, the airflow has a certain cooling effect on the measuring assembly, reducing the operating temperature of the equipment and improving its service life.

[0017] In other embodiments, the upper housing is further provided with a plurality of first locking screws that abut against the central rotating shaft and position the central rotating shaft. The two ends of the central rotating shaft are cut to form bevels, and the first locking screws abut against the bevels. The first locking screws play a key role in ensuring the stable installation and accurate positioning of the central rotating shaft, preventing the central rotating shaft from moving or rotating during operation, and ensuring that the irregular lever rotates stably around the central rotating shaft. The bevel design formed by cutting the two ends of the central rotating shaft increases the contact area between the first locking screws and the central rotating shaft, improving the stability and reliability of positioning, and making it easier to align the first locking screws with the central rotating shaft during installation, thus improving installation efficiency.

[0018] In other embodiments, the third end is a horizontally distributed L-shaped structure. The third end is connected to the radial sidewall at the lower end of the first end, and its other end faces the opposite direction to the second end. The L-shaped structure can increase the contact area between the third end and the contact, improve contact stability, and reduce measurement errors caused by poor contact. The layout of the third end being connected to the radial sidewall at the lower end of the first end and its other end facing the opposite direction to the second end allows the irregular lever to transmit force more reasonably during rotation, ensuring that the movement trajectory of the third end meets the measurement requirements and achieving accurate measurement.

[0019] In other embodiments, a spring is connected to the side of the third end away from the contact, and the other end of the spring is connected to the upper housing via a second locking screw. The connection between the spring and the upper housing via the second locking screw forms an elastic reset system. When the shaped lever rotates under the drive of the first end, the third end pushes the contact to move, and the spring is stretched or compressed. After the measurement is completed, the elastic force of the spring causes the shaped lever to return to its initial position, preparing for the next measurement. This elastic reset design gives the device an automatic reset function, improving measurement efficiency and convenience. At the same time, the spring acts as a buffer, reducing the impact force on the shaped lever during rotation, protecting the shaped lever and other related components from damage, and extending the service life of the equipment. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0021] Figure 2 This is an exploded view of the present invention.

[0022] Figure 3 This is a three-dimensional structural diagram of the lower shell of this utility model.

[0023] Figure 4 This is a three-dimensional structural diagram of the measuring assembly in this utility model.

[0024] Figure 5This is a three-dimensional structural diagram of the upper shell in this utility model.

[0025] Figure 6 This is a three-dimensional structural diagram of the upper shell of this utility model from another perspective.

[0026] Figure 7 This is a schematic diagram of the connection structure between a single transmission component and a single sensing component in this utility model.

[0027] Figure 8 This is a schematic diagram of the connection structure of the irregular lever, the first locking screw, the second locking screw and the spring in this utility model.

[0028] in: 10. Upper housing; 20. Lower housing; 30. Measuring assembly; 110. Protrusion; 120. Horizontal portion; 130. First receiving chamber; 210. Second accommodating cavity; 31. Transmission assembly; 310. Irregularly shaped lever; 311. First end; 312. Second end; 313. Third end; 320. Central rotating shaft; 330. First locking screw; 340. Spring; 350. Second locking screw; 32. Sensing component; 321. Contact; 322. Airbag; 323. Sensor; 33. Foam blowing structure. Detailed Implementation

[0029] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0030] like Figures 1-8 As shown, this embodiment discloses an ultra-small multi-contact measuring device, whose structure includes an upper housing 10, a lower housing 20, and a measuring assembly 30. It is capable of measuring the inner diameter, roundness, and center position of ultra-small holes (diameter less than 1 cm). Through its unique structural design, this ultra-small multi-contact measuring device can penetrate deep into narrow shaft holes to accurately measure their inner diameter, roundness, and center position. In many fields such as machinery manufacturing and automotive parts production, the dimensional and shape accuracy of shaft holes has a crucial impact on the assembly quality and performance of parts.

[0031] Specifically, in this embodiment, the upper housing 10 is hollow and has a first accommodating chamber 130. The hollow design of the upper housing 10 with the first accommodating chamber 130 provides installation space for some components in the measuring assembly 30. In this embodiment, the lower housing 20 is connected to the upper housing 10 and is hollow inside, with a second accommodating cavity 210. The lower housing 20 and the upper housing 10 form a complete housing structure, providing stable support and protection for the entire ultra-small multi-contact measuring device. Its hollow interior and the second accommodating cavity 210 are mainly used to install components such as the sensing component 32 in the measuring assembly 30. This design allows the sensing component 32 to be located in a relatively independent space, reducing interference from external factors on its measurement accuracy. For example, in harsh working environments, such as high temperature, high humidity, or places with strong electromagnetic interference, the second accommodating cavity 210 can provide some heat insulation, moisture protection, and electromagnetic interference shielding, ensuring that the sensing component 32 can work normally, thereby improving the accuracy and reliability of the measurement.

[0032] The measuring assembly 30 in this embodiment is disposed within the upper housing 10 and the lower housing 20, and the measuring assembly 30 includes: The transmission assembly 31 comprises at least four components, each including a shaped lever 310 with at least three ends at different heights. The uppermost first end 311 extends out of the side wall of the upper housing 10. In this embodiment, the multiple contact points, i.e., the four first ends 311, respectively contact the inner wall of the ultra-small hole. Furthermore, in this embodiment, the four first ends 311 are located at 0°, 90°, 180°, and 360° of the circumference, which not only allows for the acquisition of inner diameter parameters but also roundness and hole center position parameters. The first end 311 moves radially along the upper housing 10. The second end 312, located in the middle, extends radially outward from the first end 311 and is movably sleeved on the central rotating shaft 320, which is inserted into the inner wall of the first accommodating chamber 130. The third end 313, located at the bottom, extends radially away from the lower end of the first end 311, moving away from the second end 312. The transmission assembly 31 employs a design of four irregularly shaped levers 310, enabling measurement of the inner diameter of the shaft hole from multiple directions, thus improving the comprehensiveness and accuracy of the measurement. The three ends of the irregularly shaped levers 310 at different heights each have their unique functions. The first end 311 extends out of the side wall of the upper housing 10 and moves radially. When the ultra-small multi-contact measuring device is inserted into the shaft hole, the first end 311 is squeezed by the inner wall of the shaft hole and moves accordingly. This movement can visually reflect the change in the inner diameter of the shaft hole. The second end 312 is movably sleeved on the central rotating shaft 320, which is inserted into the inner wall of the first accommodating chamber 130, providing a stable fulcrum for the shaped lever 310. When the first end 311 is moved by an external force, the shaped lever 310 rotates around the central rotating shaft 320, thereby converting the radial movement of the first end 311 into the corresponding movement of the third end 313. The third end 313 extends radially away from the lower end of the first end 311 and contacts the contact 321 of the sensing component 32, transmitting the rotation information of the shaped lever 310 to the sensing component 32, thus realizing the measurement function. This transmission component 31 design cleverly utilizes the lever principle, achieving accurate measurement of the inner diameter of the shaft hole through a simple mechanical structure, and has the advantages of simple structure and high reliability.

[0033] The number of sensing components 32 corresponds to that of the transmission components 31. Each sensing component 32 has a contact 321 at its upper end that contacts the third end 313. The sensing components 32 and transmission components 31 are one-to-one, enabling accurate reception of information transmitted from the transmission components 31. The contact 321, as the contact part between the sensing component 32 and the third end 313, is crucially designed. The contact 321 is typically made of high-precision, wear-resistant materials to ensure that it does not wear or deform during long-term contact and friction with the third end 313, thus maintaining measurement accuracy. When the third end 313 moves under the influence of the shaped lever 310, it pushes the contact 321 to produce a corresponding displacement. By detecting the displacement change of the contact 321, the sensing component 32 can obtain information about the inner diameter of the shaft hole. This indirect measurement method effectively protects the precision components inside the sensing component 32 from direct external force damage, improving the service life and reliability of the equipment.

[0034] The third ends 313 of the irregularly shaped levers 310 in the multiple transmission components 31 are staggered. This staggered distribution of the third ends 313 of the multiple irregularly shaped levers 310 has several advantages. First, this distribution allows the sensing components 32 to be more evenly distributed around the ultra-small multi-contact measuring device, thereby measuring the inner diameter of the shaft hole from multiple angles, improving the comprehensiveness and accuracy of the measurement. Second, the staggered distribution of the third ends 313 avoids interference between the various transmission components 31, ensuring that each transmission component 31 can operate independently and stably. If the third ends 313 are too concentrated, they may collide with each other during movement, affecting the measurement accuracy and normal operation of the equipment. Furthermore, this design also helps to reduce the overall size of the ultra-small multi-contact measuring device, making it suitable for measuring narrower shaft holes.

[0035] The upper housing 10 includes a protrusion 110 and a horizontal portion 120. The protrusion 110 extends upward from the axis of the horizontal portion 120. Both the protrusion 110 and the horizontal portion 120 are cylindrical structures, and the diameter of the protrusion 110 is smaller than the diameter of the horizontal portion 120. The side of the horizontal portion 120 of the upper housing 10 away from the protrusion 110 is connected to the lower housing 20. The design of the protrusion 110 and the horizontal portion 120 of the upper housing 10 has specific functions. The protrusion 110 extends upward from the axis of the horizontal portion 120, and its diameter is smaller than that of the horizontal portion 120. In this embodiment, it acts on an ultra-small hole (diameter less than 1 cm), therefore the diameter of the protrusion 110 is smaller than the inner diameter of the ultra-small hole. This structure makes it easier for the ultra-small multi-contact measuring device to be inserted into the shaft hole. The smaller diameter of the protrusion 110 can reduce friction with the inner wall of the shaft hole, reduce insertion resistance, and improve measurement efficiency. Meanwhile, the protrusion 110 also provides space for the extension of the first end 311, ensuring that the first end 311 can smoothly extend out of the side wall of the upper housing 10 and move radially. The horizontal part 120 serves as a connection and support, connecting with the lower housing 20 to form a stable whole, providing a reliable mounting base for the internal measuring assembly 30. In addition, the cylindrical structural design gives the upper housing 10 good guiding properties within the shaft hole, ensuring that the ultra-small multi-contact measuring device is accurately inserted along the axial direction of the shaft hole, reducing measurement errors.

[0036] The first end 311 of the irregular lever 310 extends into the protrusion 110 and moves radially along the protrusion 110. The second end 312 and the third end 313 of the irregular lever 310 are disposed in the first receiving chamber 130 of the horizontal portion 120 of the upper housing 10. The design of the first end 311 extending into the protrusion 110 and moving radially allows it to directly contact the inner wall of the shaft hole, accurately sensing changes in the inner diameter of the shaft hole. The protrusion 110 provides a relatively independent space for the movement of the first end 311, reducing interference from external factors. The second end 312 and the third end 313 are disposed in the first receiving chamber 130 of the horizontal portion 120 of the upper housing 10, which provides them with a stable operating environment. Within the first receiving chamber 130, the second end 312 is stably fitted onto the central rotating shaft 320, ensuring that the irregular lever 310 can rotate freely around the central rotating shaft 320. The third end 313 contacts the contact 321 within the first receiving chamber 130, and its movement trajectory can be effectively controlled and constrained, thereby improving the accuracy and reliability of the measurement. Simultaneously, the first receiving chamber 130 also provides some protection for the irregular lever 310, preventing damage from collisions during transportation or use.

[0037] The sensing component 32 also includes a lifting structure, which comprises an air bladder 322 and air holes on the air bladder 322. The air bladder 322 is connected to the contact 321, driving the contact 321 to move axially. A sensor 323 for sensing changes in axial distance is also connected to the sensing component 32. The lifting structure within the sensing component 32 is the air bladder 322, which can be inflated and deflated through the air holes. When the air bladder 322 is inflated, it expands and pushes the contact 321 to move axially, lifting the third end 313. At this time, under the action of the lever, the first end 311 will retract radially along the protrusion 110 into the protrusion 110, making it easy to avoid damaging the first end 311 when inserting into a micro-hole. When the air bladder 322 is deflated, the contact 321 will return to its initial position under the action of other forces, at which time the third end 313 will reset under the action of the spring 340. This design allows the contact 321 to be slightly adjusted in the axial direction, thus better adapting to the measurement needs of shaft holes of different sizes.

[0038] In this embodiment, the sensor 323 is connected to the sensing component 32 and can sense the axial distance change of the contact 321 in real time, converting these changes into electrical signals that are transmitted to the subsequent processing system. By analyzing and processing these electrical signals, accurate data on the inner diameter of the shaft hole can be obtained. This design, which combines the airbag 322 and the sensor 323, has advantages such as fast response speed, high measurement accuracy, and good stability, and can meet the high requirements of modern industrial production for shaft hole measurement.

[0039] The lower housing 20 has a columnar structure, and the sensing component 32 is housed within the second accommodating cavity 210 inside the lower housing 20. The second accommodating cavity 210 inside the lower housing 20 provides a dedicated installation space for the sensing component 32, allowing it to operate in a relatively independent and stable environment. Within the second accommodating cavity 210, the sensing component 32 is protected from external impacts and interference, ensuring its normal operation. Simultaneously, the second accommodating cavity 210 also provides some heat dissipation for the sensing component 32, preventing it from overheating during prolonged operation and affecting measurement accuracy.

[0040] A dust-blowing structure 33 for blowing air towards the upper housing 10 is also provided on the axis of the lower housing 20. During shaft hole measurement, dust, iron filings, and other impurities may be present inside the shaft hole or on the transmission component 31. If these impurities adhere to the surface of the ultra-small multi-contact measuring device or enter the measuring assembly 30, they will affect the accuracy of the measurement and the normal operation of the equipment. The dust-blowing structure 33, by blowing air towards the upper housing 10, can form a strong airflow to blow away the dust and impurities in the shaft hole, keeping the ultra-small multi-contact measuring device clean. At the same time, the airflow can also cool the measuring assembly 30 to a certain extent, reducing the temperature of the equipment during operation and improving its service life. The dust-blowing structure 33 is typically designed with a high-efficiency air pump and a reasonable air passage layout to ensure that it can generate an airflow with sufficient strength and stability to meet the needs of actual use.

[0041] The upper housing 10 is also provided with a plurality of first locking screws 330 that abut against the central rotating shaft 320 and position the central rotating shaft 320. The two ends of the central rotating shaft 320 are cut to form bevels, and the first locking screws 330 abut against these bevels. The first locking screws 330 on the upper housing 10 play a crucial role in ensuring the stable installation and accurate positioning of the central rotating shaft 320. The contact between the first locking screws 330 and the central rotating shaft 320 prevents the central rotating shaft 320 from moving or rotating during operation, thereby ensuring that the irregular lever 310 can rotate stably around the central rotating shaft 320. The bevel design formed by cutting the two ends of the central rotating shaft 320 increases the contact area between the first locking screws 330 and the central rotating shaft 320, improving the stability and reliability of positioning. At the same time, the bevel design also makes it easier for the first locking screws 330 to align with the central rotating shaft 320 during installation, improving installation efficiency.

[0042] The third end 313 is a horizontally distributed L-shaped structure, connected to the radial sidewall of the lower end of the first end 311, with its other end facing opposite to the second end 312. (The horizontally distributed L-shaped structure of the third end 313 has several advantages. First, the L-shaped structure increases the contact area between the third end 313 and the contact 321, improving contact stability and reducing measurement errors caused by poor contact. Second, the connection of the third end 313 to the radial sidewall of the lower end of the first end 311, with its other end facing opposite to the second end 312, allows the shaped lever 310 to transmit force more effectively during rotation, ensuring that the movement trajectory of the third end 313 meets the measurement requirements. For example, when the first end 311 moves due to pressure from the inner wall of the shaft hole, the shaped lever 310 rotates around the central rotation axis 320, and the L-shaped third end 313 accurately pushes the contact 321 to produce a corresponding displacement, thereby achieving precise measurement.)

[0043] A spring 340 is connected to the side of the third end 313 away from the contact 321, and the other end of the spring 340 is connected to the upper housing 10 via a second locking screw 350. The spring 340 connected to the side of the third end 313 away from the contact 321 plays a crucial role. The spring 340, connected to the upper housing 10 via the second locking screw 350, forms an elastic reset system. When the shaped lever 310 rotates under the drive of the first end 311, the third end 313 pushes the contact 321 to move, while the spring 340 is stretched or compressed. After measurement, the elastic force of the spring 340 returns the shaped lever 310 to its initial position, preparing it for the next measurement. This elastic reset design enables the ultra-small multi-contact measuring device to have an automatic reset function, improving measurement efficiency and convenience. Simultaneously, the spring 340 also acts as a buffer, reducing the impact force on the shaped lever 310 during rotation, protecting the shaped lever 310 and other related components from damage, and extending the service life of the equipment.

[0044] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. An ultra-small multi-contact measuring device, characterized by, include: The upper shell is hollow inside and has a first receiving chamber. The lower shell is connected to the upper shell and is hollow inside, and is provided with a second receiving chamber; A measuring assembly, disposed within the upper and lower housings, comprising: The transmission assembly comprises at least four parts, including a shaped lever with at least three ends at different heights. The first end, located at the uppermost end, extends out of the side wall of the upper housing and moves radially along the upper housing. The second end, located in the middle, extends radially outward from the first end and is movably sleeved on the central rotating shaft, which is inserted into the inner wall of the first accommodating cavity. The third end, located at the lower end, extends radially away from the lower end of the first end in a direction away from the second end. The number of sensing components corresponds to the number of transmission components, and the upper end of the sensing component is provided with a contact that contacts the third end.

2. The ultra-small multi-contact measurement device of claim 1, wherein: The third ends of the irregularly shaped levers in the multiple transmission components are staggered.

3. The ultra-small multi-contact measurement device of claim 1, wherein: The upper housing includes a protruding portion and a horizontal portion. The protruding portion extends upward from the axis of the horizontal portion. Both the protruding portion and the horizontal portion are cylindrical structures, and the diameter of the protruding portion is smaller than the diameter of the horizontal portion. The side of the horizontal portion of the upper housing away from the protruding portion is connected to the lower housing.

4. The ultra-small multi-contact measurement device of claim 3, wherein: The first end of the irregular lever extends into the protrusion and moves radially along the protrusion. The second and third ends of the irregular lever are disposed in the first receiving chamber of the horizontal part of the upper housing.

5. The ultra-small multi-contact measurement device of claim 1, wherein: The sensing component also includes a lifting structure, which includes an airbag and air holes on the airbag. The airbag is connected to the contact and drives the contact to move axially. The sensing component is also connected to a sensor that senses changes in axial distance.

6. The ultra-small multi-contact measuring device as described in claim 1, characterized in that: The lower housing has a columnar structure, and the sensing component is disposed in the second accommodating cavity within the lower housing.

7. The ultra-small multi-contact measuring device as described in claim 1, characterized in that: A soot blowing structure for blowing air upwards is also provided on the axis of the lower shell.

8. The ultra-small multi-contact measuring device as described in claim 1, characterized in that: The upper housing is also provided with a plurality of first locking screws that abut against the central rotating shaft and position the central rotating shaft. The two ends of the central rotating shaft are cut to form bevels, and the first locking screws abut against the bevels.

9. The ultra-small multi-contact measurement device of claim 1, wherein: The third end is a horizontally distributed L-shaped structure, which is connected to the radial sidewall of the lower end of the first end, and its other end faces the opposite direction to the second end.

10. The ultra-small multi-contact measuring device as described in claim 1, characterized in that: A spring is connected to the side of the third end away from the contact, and the other end of the spring is connected to the upper housing via a second locking screw.

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