Speed measuring device

Abstract

The utility model provides a speed measuring device which is used for detecting the rotating speed of a motor rotating shaft of belt type conveying equipment, the speed measuring device comprises a first magnet assembly, a rotating shaft assembly, a second magnet assembly and an induction assembly, the first magnet assembly is in contact with the motor rotating shaft, and the rotating shaft assembly is in contact with the second magnet assembly. The motor rotating shaft rotates to drive the first magnet assembly to rotate synchronously; the first end of the rotating shaft assembly is fixedly connected with the first magnet assembly, the second end of the rotating shaft assembly is connected with the second magnet assembly, and the first magnet assembly rotates to drive the rotating shaft assembly to rotate so as to drive the second magnet assembly to rotate; the induction assembly and the second magnet assembly are correspondingly arranged, and under the condition that the second magnet assembly rotates, the induction assembly can generate electric energy.

Description

Technical Field

[0001] This application relates to the field of measurement technology, and in particular to a speed measuring device. Background Technology

[0002] Existing speed sensors are all wired, relying on an external power source for operation. The power and signal propagation depend on transmission cables laid out in the industrial environment. Wired signal transmission requires pre-laid cabling, resulting in numerous lines that limit the mobility and flexibility of the speed sensors. For large or complex industrial sites, the installation process is complex and time-consuming, requiring specialized cabling techniques and equipment, increasing installation costs and difficulty. Wired transmission necessitates the purchase of large quantities of cables and related equipment, and the length and cost of these cables increase with distance. Furthermore, if the wired lines suffer physical damage, such as being trampled, squeezed, or corroded, troubleshooting and repair are required, increasing maintenance costs. Utility Model Content

[0003] According to one aspect of this disclosure, a speed measuring device is provided for detecting the rotational speed of a motor shaft of a belt conveyor. The speed measuring device includes: a first magnet assembly 101, a shaft assembly 102, a second magnet assembly 103, and a sensing component 104. The first magnet assembly 101 is in contact with the motor shaft, and rotation of the motor shaft can drive the first magnet assembly 101 to rotate synchronously. A first end of the shaft assembly 102 is fixedly connected to the first magnet assembly 101, and a second end of the shaft assembly 102 is connected to the second magnet assembly 103. Rotation of the first magnet assembly 101 can drive rotation of the shaft assembly 102, which in turn drives rotation of the second magnet assembly 103. The sensing component 104 is correspondingly disposed to the second magnet assembly 103, and when the second magnet assembly 103 rotates, the sensing component 104 can generate electrical energy.

[0004] Furthermore, the speed measuring device also includes a circuit board assembly 105, which is used to receive electrical energy generated by the sensing component 104 and to power the speed measuring device.

[0005] Furthermore, the circuit board assembly 105 is also used to receive and process the electrical signals generated by the sensing assembly 104.

[0006] Furthermore, the speed measuring device also includes a plug 106, which is used to transmit the processed electrical signal to an external device.

[0007] Furthermore, the speed measuring device also includes a bearing 107, which is disposed outside at least a portion of the rotating shaft assembly 102, and is used to support the rotation of the rotating shaft assembly 102.

[0008] Furthermore, the speed measuring device also includes a bearing retaining ring 108 and a locking member 109, wherein the bearing retaining ring 108 and the locking member 109 are used to limit the axial position of the bearing 107.

[0009] Furthermore, the second magnet assembly 103 includes a multipole magnet with its magnetic poles alternately distributed circumferentially.

[0010] Furthermore, the speed measuring device also includes a bracket 110, which is used to fix the speed measuring device.

[0011] Furthermore, the speed measuring device also includes a housing 111, which is disposed outside at least a portion of the speed measuring device.

[0012] Furthermore, the speed measuring device also includes a rear cover 112, which forms a sealing structure with the housing 111, and the sealing structure seals at least a portion of the components of the speed measuring device.

[0013] The embodiments described in this application have the following beneficial effects:

[0014] The speed measuring device provided in this application is used to detect the rotational speed of the motor shaft of a belt conveyor. The rotation of the motor shaft drives the first magnet assembly of the speed measuring device to rotate synchronously. The first end of the shaft assembly is fixedly connected to the first magnet assembly, and the second end of the shaft assembly is connected to the second magnet assembly. The rotation of the first magnet assembly can drive the shaft assembly to rotate, thereby driving the second magnet assembly to rotate. The sensing component is correspondingly arranged with the second magnet assembly. When the second magnet assembly rotates, the sensing component can generate electrical energy, so that the speed measuring device can work by self-generating electricity without external power supply. This does not limit the mobility and flexibility of the speed measuring device, eliminates the need for extensive wiring, and saves maintenance costs. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. The accompanying drawings in the following description are merely exemplary embodiments of this disclosure.

[0016] Figure 1 This is a schematic cross-sectional view of the overall speed measuring device of this application; and

[0017] Figure 2This is a schematic diagram of the disassembled structure of the speed measuring device of this application.

[0018] Figure label:

[0019] 100. Speed ​​measuring device; 101. First magnet assembly; 102. Rotating shaft assembly; 103. Second magnet assembly; 104. Sensing assembly; 105. Circuit board assembly; 106. Plug; 107. Bearing; 108. Bearing retaining ring; 109. Locking component; 110. Bracket; 111. Housing; 112. Rear cover. Detailed Implementation

[0020] In the following description, exemplary embodiments of the present application will be described in more detail with reference to the accompanying drawings. As will be appreciated by those skilled in the art, the described embodiments can be modified in various ways without departing from the concept or scope of the present application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive. These embodiments are provided so that this application will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art. Furthermore, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily obscuring the concepts of the present application.

[0021] The accompanying drawings illustrate various structural schematics according to embodiments of this application. These drawings are not to scale, and some details have been enlarged for clarity, while others may be omitted. The shapes of the various structures and devices shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design alternatives according to actual needs. The following related technologies are optional solutions and can be arbitrarily combined with the technical solutions of the embodiments of this application, all of which fall within the protection scope of the embodiments of this application.

[0022] The speed measuring device 100 will now be described in detail with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic cross-sectional view of the speed measuring device 100 of this application. Figure 1 ; Figure 2 This is a disassembly diagram of the speed measuring device 100. Figure 1Specifically, the speed measuring device 100 of this application is used to detect the rotational speed of the motor shaft of a belt conveyor. The speed measuring device 100 includes: a first magnet assembly 101, a shaft assembly 102, a second magnet assembly 103, and a sensing component 104. The first magnet assembly 101 is in contact with the motor shaft, and the rotation of the motor shaft can drive the first magnet assembly 101 to rotate synchronously. The first end of the shaft assembly 102 is fixedly connected to the first magnet assembly 101, and the second end of the shaft assembly 102 is connected to the second magnet assembly 103. The rotation of the first magnet assembly 101 can drive the shaft assembly 102 to rotate, thereby driving the second magnet assembly 103 to rotate. The sensing component 104 is correspondingly arranged with the second magnet assembly 103, and the sensing component 104 can generate electrical energy when the second magnet assembly 103 rotates.

[0024] The speed measuring device 100 can be a device used to measure the rotational speed of mechanical rotating parts (such as motor shafts, drive shafts of belt conveyors, etc.). Belt conveyors can be material handling equipment used in industrial and logistics fields. Belt conveyors can continuously transport bulk materials (such as coal, ore, sand, etc.) or packaged goods (such as parcels, products, etc.). Belt conveyors achieve efficient material transfer through the continuous movement of the conveyor belt, and have advantages such as simple structure, reliable operation, and convenient maintenance. The belt conveyor includes a motor and a motor shaft.

[0025] The first magnet assembly 101 can be a permanent magnet, which possesses stability. The first magnet assembly 101 can be cylindrical or annular, facilitating symmetrical installation with the motor shaft. The first magnet assembly 101 can directly contact the motor shaft, achieving synchronous rotation through friction or mechanical connection (e.g., keyway connection, increasing the texture of the friction surface). The first magnet assembly 101 can have a protective shell, the material of which needs to be wear-resistant, such as stainless steel or aluminum alloy, to prevent magnet wear or corrosion, while also shielding against external magnetic field interference.

[0026] In one example, such as Figure 1 and Figure 2 As shown, the speed measuring device 100 also includes a second magnet assembly 103, which includes a multipole magnet with the magnetic poles of the multipole magnet being alternately distributed circumferentially.

[0027] The magnetic poles (N and S poles) of a multipole magnet are alternately distributed along the circumference of the magnet. For example, the magnetic pole distribution of a 12-pole multipole magnet might be NSNSNSNSNSNS. Multipole magnets are typically designed to be circular for better fit with the rotating shaft assembly 102, enabling smooth rotation. Each magnetic pole can be designed as a fan or strip to ensure a smooth transition between poles and reduce magnetic resistance. The second magnet assembly 103 typically consists of multiple magnets with uniformly distributed magnetic poles along the circumference, generating a more uniform magnetic field and reducing measurement errors caused by magnetic field inhomogeneity. The multipole magnet design can improve the anti-interference capability of the speed measuring device and reduce the influence of external magnetic fields on the measurement results.

[0028] The second magnet assembly 103 is driven to rotate by the rotating shaft assembly 102. The core of the second magnet assembly 103 is a magnet, which can be a permanent magnet or an electromagnet. Permanent magnets have a stable magnetic field, while the magnetic field of an electromagnet can be adjusted by an electric current. The magnets can be circular, square, etc. The shape of the magnets is not specifically limited here, as long as it achieves the principle of this application. The second magnet assembly 103 can be mounted on the main shaft of the rotating shaft assembly 102 using a fixing device, such as bolts, nuts, or other mechanical connections. Alternatively, the second magnet assembly 103 can be magnetically fixed to the main shaft of the rotating shaft assembly 102, ensuring that the second magnet assembly 103 does not loosen during rotation.

[0029] The first end of the rotating shaft assembly 102 is fixedly connected to the first magnet assembly 101, and the second end of the rotating shaft assembly 102 is connected to the second magnet assembly 103. Figure 1 As shown, the left end of the shaft assembly 102 is the first end, and the right end of the shaft assembly 102 is the second end. The term "fixed connection" can refer to one or more of various forms such as welding, plugging, riveting, keyway fit, and bolting.

[0030] The rotating shaft assembly 102 may include, for example, a spindle, coupling, seals, fasteners, etc.; the rotating shaft assembly is not limited in detail herein, as long as it can realize the principles of this application. The spindle may be the core component of the rotating shaft assembly, used to connect the first magnet assembly 101 and the second magnet assembly 103, playing a major role in transmitting power. The spindle is typically made of a high-strength metal material (such as stainless steel) to ensure that it has sufficient strength and wear resistance to withstand long-term rotation and torque transmission. The spindle may be cylindrical in shape with a smooth surface to reduce friction.

[0031] The coupling can be used to connect the main shaft to the first magnet assembly 101 and the second magnet assembly 103. The coupling can be fixedly connected to the main shaft and the magnet assembly by bolts. To ensure smooth power transmission, the coupling type can be a rigid coupling or a flexible coupling. The specific type of coupling is not limited here, as long as it can achieve the principle of this application.

[0032] Seals are used to prevent leakage of dust, impurities, and lubricating oil, ensuring cleanliness and lubrication inside the shaft assembly 102. The type of seal can be an oil seal or a mechanical seal; the specific type is not limited here, as long as it achieves the principles of this application. Seals are typically installed at the connection between the spindle and external components.

[0033] Fasteners are used to hold the various components of a shaft assembly together, ensuring the stability and reliability of its overall structure. Fasteners, such as bolts and nuts, are used to connect and secure the various components, ensuring a firm connection.

[0034] The first magnet assembly 101 is in contact with the motor shaft. The first magnet assembly 101 can be attracted to the motor shaft. The first magnet assembly 101 uses a strong magnet. In general, the rotation speed of the motor shaft of the belt conveyor in the industrial site is not too fast. The first magnet assembly 101 will not be detached due to the rotation of the motor shaft of the belt conveyor.

[0035] The rotation of the motor shaft of the belt conveyor drives the first magnet assembly 101 to rotate. The first end of the shaft assembly 102 is fixedly connected to the first magnet assembly 101, and the second end of the shaft assembly 102 is connected to the second magnet assembly 103. The rotation of the first magnet assembly 101 can drive the shaft assembly 102 to rotate, which in turn drives the second magnet assembly 103 to rotate.

[0036] like Figure 1 As shown, the corresponding arrangement of the sensing component 104 and the second magnet component 103 can be a spatial correspondence. For example, the sensing component 104 is typically installed near the second magnet component 103 (e.g., the sensing component 104 can be located to the right of the second magnet component 103) to ensure sufficient magnetic field interaction between them. The sensing coil of the sensing component 104 needs to be perpendicular to or at a certain angle to the magnetic field direction of the second magnet component 103 to ensure that changes in the magnetic field can effectively pass through the sensing coil. The sensing component 104 may include a sensing coil and circuitry, and the sensing coil is typically made of multiple turns of wire. The wire can be made of a material with good conductivity, such as copper or aluminum.

[0037] Specifically, when the main shaft of the rotating shaft assembly 102 rotates, the second magnet assembly 103 rotates accordingly. During rotation, the magnet generates a rotating magnetic field. The rotating magnetic field generated by the second magnet assembly 103 passes through the induction coil of the induction assembly 104, generating an induced electromotive force (EMF) in the induction coil. The induction assembly 104 converts the induced EMF into stable electrical energy through a circuit. Specifically, when the rotating magnetic field of the second magnet assembly 103 passes through the induction coil, an induced EMF is generated in the induction coil according to Faraday's law of electromagnetic induction. The induced EMF generated by the induction coil is processed and transmitted through a circuit. The circuit may include components such as rectifiers and filters; the rectifier can convert the induced EMF into stable direct current (DC) or alternating current (AC).

[0038] As described above, the speed measuring device 100 is used to detect the rotational speed of the motor shaft of the belt conveyor. The rotation of the motor shaft drives the first magnet assembly 101 of the speed measuring device 100 to rotate synchronously. The first end of the shaft assembly 102 is fixedly connected to the first magnet assembly 101, and the second end of the shaft assembly 102 is connected to the second magnet assembly 103. The rotation of the first magnet assembly 101 can drive the shaft assembly 102 to rotate, thereby driving the second magnet assembly 103 to rotate. The sensing component 104 is correspondingly arranged with the second magnet assembly 103. When the second magnet assembly 103 rotates, the sensing component 104 can generate electrical energy, so that the speed measuring device 100 can work by generating its own power without external power supply. This does not limit the mobility and flexibility of the speed measuring device 100, eliminates the need for extensive wiring, and saves maintenance costs.

[0039] In one example, such as Figure 1 As shown, the speed measuring device 100 also includes a bearing 107. The bearing 107 is disposed on the exterior of at least a portion of the rotating shaft assembly 102, and the bearing 107 is used to support the rotation of the rotating shaft assembly 102.

[0040] The bearing 107 may be disposed outside at least a portion of the shaft assembly 102. Here, at least a portion of the exterior may be the entire exterior of the shaft assembly 102, with the bearing 107 in contact with the shaft assembly 102, or the bearing 107 may be disposed outside a portion of the shaft assembly 102, with the bearing 107 in contact with the shaft assembly 102.

[0041] Bearing 107 can be installed in the middle or at both ends (e.g., left and right ends) of the shaft assembly 102. The inner ring of bearing 107 is tightly fitted with the main shaft of the shaft assembly 102, and the outer ring of bearing 107 is fixed to the bracket 110. The rolling elements (such as balls or rollers) of bearing 107 are located between the inner and outer rings of bearing 107. The rolling of the rolling elements reduces the friction between the inner and outer rings of bearing 107. Bearing 107 distributes the axial and radial loads of the main shaft of shaft assembly 102 to the bracket 110 through its rolling elements, thereby providing stable support for the rotation of shaft assembly 102. This installation method can effectively reduce the vibration and offset of shaft assembly 102 during rotation.

[0042] The speed measuring device 100 may further include a circuit board assembly 105, which is used to receive electrical energy generated by the sensing component 104 and to power the speed measuring device 100. The circuit board assembly 105 is also used to receive electrical signals generated by the sensing component 104 and to process the electrical signals.

[0043] The circuit board assembly 105 is an important component in the speed measuring device 100. The circuit board assembly 105 receives the electrical energy generated by the sensing component 104, converts and processes it to power the entire speed measuring device.

[0044] Specifically, the induced electromotive force generated by the sensing component 104 is typically alternating current (AC). The circuit board assembly 105 receives these induced electromotive forces by connecting to the output terminal of the sensing component 104. The magnitude of the induced electromotive force may be small, and there may be noise and interference.

[0045] The sensing component 104 can convert mechanical motion (such as the rotation of a motor shaft) into an electrical signal. This electrical signal is typically manifested as a pulse voltage or current, and its frequency is proportional to the rotational speed of the motor shaft. By measuring the frequency of the electrical signal, the rotational speed of the motor shaft can be calculated. The measurement of the motor shaft's rotational speed will be explained in detail below and will not be elaborated upon here.

[0046] The circuit board assembly 105 receives electrical signals generated by the sensing assembly 104 and needs to process these signals to ensure that it can stably power the speed measuring device.

[0047] For example, the induced electromotive force generated by the sensing component 104 is typically small and may not be sufficient to directly drive other components in the speed measuring device or the measured circuit for accurate reading. Therefore, the circuit board assembly 105 needs to amplify these signals. Specifically, operational amplifiers are commonly used to amplify the signals. Operational amplifiers have advantages such as high gain and low noise, and can amplify the weak induced electromotive force to a level suitable for subsequent processing. The amplification factor can be designed according to actual needs. For example, if the induced electromotive force is a few millivolts (mV), but the subsequent circuit requires a signal of several volts (V), then an appropriate amplification factor needs to be designed.

[0048] For example, the circuit board assembly 105 converts the alternating current (AC) generated by the sensing component 104 into direct current (DC). Commonly used rectifier circuits include half-wave rectification, full-wave rectification, and bridge rectification. Bridge rectification is the most commonly used, as it can fully utilize both the positive and negative half-cycles of the AC power, improving energy efficiency. The rectified DC power usually contains ripple, which needs to be removed by a filter circuit to make the DC power more stable. To ensure the stable operation of the speed measuring device, the circuit board assembly 105 needs to regulate the voltage of the rectified and filtered DC power. For example, a linear voltage regulator circuit or a switching voltage regulator circuit can be used for voltage regulation. The circuit board assembly 105 also needs to manage the power to ensure that the speed measuring device 100 receives a stable power supply under different operating conditions. This includes functions such as voltage regulation, current limiting, overvoltage protection, and undervoltage protection.

[0049] The circuit board assembly 105 distributes the processed electrical energy to various components of the speed measuring device 100, including the first magnet assembly 101, the second magnet assembly 103, the sensing assembly 104, and other possible electronic components (such as sensors, controllers, etc.).

[0050] The speed measuring device 100 also includes a plug 106, which is used to transmit the processed electrical signal to an external device.

[0051] The connector 106 is a key interface component in the speed measuring device 100. It transmits the electrical signals processed by the circuit board assembly 105 to external devices (such as displays, controllers, data acquisition systems, etc.) for further analysis, display, or control. The transmitted signals can be analog signals (such as voltage or current signals) or digital signals (such as pulse signals, serial communication signals, etc.). Specifically, for example, the electrical signals processed by the circuit board assembly 105 are transmitted to the pins of the connector 106 via a connecting cable. The pins of the connector 106 connect to the sockets of the external devices, and the electrical signals are transmitted to the external devices through the contact between the pins and the sockets. The external devices receive and process these electrical signals through their internal circuitry for further analysis, display, or control. The signal sampling circuit is a key component in the speed measuring device 100. By extracting pulse signals from the sensing component 104 and performing filtering, amplification, shaping, and isolation processes, it ensures the quality and stability of the signal. The signal sampling circuit takes a portion of the pulse signal as the rotation speed signal. This signal is processed by the circuit and then sent to the external device through the isolation circuit. The external device counts the pulses to measure the speed.

[0052] When the voltage of an external device exceeds a set value, the built-in protection circuit (such as a TVS) of plug 106 will respond quickly to discharge the excess voltage, protecting the speed measuring device and the external device. When a short circuit occurs in the external device, the built-in fuse of plug 106 will blow, cutting off the power or signal and preventing excessive current from damaging the speed measuring device and the external device. Plug 106 not only ensures stable signal transmission but also provides a standardized connection and certain protection functions with external devices. Plug 106 enables reliable connection and efficient communication between the speed measuring device 100 and external devices.

[0053] The speed measuring device 100 also includes a bearing retaining ring 108 and a locking member 109, wherein the bearing retaining ring 108 and the locking member 109 are used to limit the axial position of the bearing 107.

[0054] In the speed measuring device 100, the bearing retainer 108 and the locking element 109 are important components for ensuring the stable operation of the bearing 107. The main function of the bearing retainer 108 and the locking element 109 is to limit the axial position of the bearing 107 and prevent axial movement of the bearing 107 during operation. For example, the bearing retainer 108 is mounted on the inner ring of the bearing 107, fitting tightly with the bearing 107 to limit the axial movement of the inner ring. The bearing retainer 108 can be made of a high-strength metal material, such as steel or aluminum alloy, to ensure sufficient strength and wear resistance. In light-load or low-speed applications, plastic materials can also be used to reduce weight and cost. No restrictions are placed on the material of the bearing retainer 108, as long as the principle of this application can be achieved.

[0055] The locking element 109 is used to fix the bearing retainer 108 onto the bearing 107, ensuring that the bearing retainer 108 will not loosen, thereby further restricting the axial position of the bearing 107. The locking element 109 can be a nut, screw, snap ring, etc., and the specific form depends on the design and installation method of the bearing retainer 108.

[0056] By limiting the axial position of bearing 107, bearing retaining ring 108 and locking element 109 can effectively prevent bearing 107 from moving axially during operation, thereby improving the stability of the entire speed measuring device 100. Limiting the axial movement of bearing 107 can reduce vibration caused by bearing 107 loosening, improve the measurement accuracy and reliability of speed measuring device 100, and reduce downtime caused by bearing 107 failure.

[0057] The speed measuring device 100 also includes a bracket 110, which is used to fix the speed measuring device 100.

[0058] The primary function of the bracket 110 is to secure the speed measuring device 100, ensuring its stability, measurement accuracy, and long-term reliability. Specifically, the bracket 110 prevents the speed measuring device 100 from shaking due to vibration, wind, or mechanical impact, thus affecting measurement data. The bracket 110 also prevents the speed measuring device 100 from being directly exposed to harsh environments (such as rain, dust, and high temperatures), extending its service life. The bracket 110 provides a quick-release structure for easy debugging, calibration, or replacement of the speed measuring device 100. In industrial environments, the speed measuring device 100 may be used to monitor the operating speed of equipment such as motors and conveyor belts. The bracket 110 can secure the speed measuring device near the equipment, ensuring that the speed measuring device 100 can accurately measure the rotational or linear speed of mechanical components. The bracket 110 can be an L-shaped bracket for lateral mounting of the speed measuring device. The bracket 110 may secure the speed measuring device 100 using bolts, clips, or other mechanical connections. In industrial environments, the bracket 110 may require high-strength materials (such as steel).

[0059] The speed measuring device 100 further includes a housing 111, which is disposed outside at least a portion of the speed measuring device 100.

[0060] The housing 111 is the external protective structure of the speed measuring device 100, used to enclose and protect at least a portion of the internal components of the speed measuring device 100. The housing 111 prevents external impurities such as dust and moisture from entering the speed measuring device 100, thereby protecting the internal electronic components and mechanical parts. The housing 111 provides a certain degree of physical protection, preventing damage to the speed measuring device 100 when subjected to external impacts. The housing 111 provides stable structural support for the speed measuring device 100, ensuring the correct installation and fixation of the internal components. The housing 111 can also cooperate with the bracket 110 to further enhance the overall stability of the speed measuring device 100. The housing material can be selected from materials with high strength, good corrosion resistance, and electromagnetic shielding performance, such as aluminum alloy or stainless steel, suitable for industrial environments or occasions requiring a high level of protection.

[0061] The speed measuring device 100 further includes a rear cover 112, which forms a sealing structure with the housing 111, and the sealing structure seals at least a portion of the components of the speed measuring device.

[0062] The rear cover 112 is part of the housing 111 and is typically located at the rear or bottom of the housing 111, such as... Figure 1 and Figure 2 As shown, this is used to close the opening of the housing 111. The sealing structure prevents external impurities such as dust and moisture from entering the speed measuring device 100, thereby protecting the internal electronic components and mechanical parts of the speed measuring device 100. This is especially important for speed measuring devices 100 used in harsh environments (such as industrial sites). A rubber sealing ring may be used to seal the rear cover 112 to the housing 111. The sealing ring can fill the tiny gaps between them to ensure a tight seal; alternatively, a mechanical structure (such as clips, screws, etc.) can be used to press the rear cover 112 onto the housing 111 to achieve a seal. The rear cover 112 is part of the sealing structure and is typically made of metal or plastic, possessing a certain strength and rigidity. The housing is another part of the sealing structure and is usually used in conjunction with the rear cover, achieving a seal through mechanical connection or sealing materials.

[0063] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0065] 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 at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0066] In this application, unless otherwise stated, directional terms such as "up" and "down" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" are generally used in relation to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this application.

[0067] The above description is merely an exemplary embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope described in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A speed measuring device for detecting the rotational speed of the motor shaft of a belt conveyor, the speed measuring device comprising: The assembly comprises a first magnet assembly (101), a rotating shaft assembly (102), a second magnet assembly (103), a sensing assembly (104), and a circuit board assembly (105), wherein, The first magnet assembly (101) is in contact with the motor shaft, and the rotation of the motor shaft can drive the first magnet assembly (101) to rotate synchronously; The first end of the rotating shaft assembly (102) is fixedly connected to the first magnet assembly (101), and the second end of the rotating shaft assembly (102) is connected to the second magnet assembly (103). The rotation of the first magnet assembly (101) can drive the rotating shaft assembly (102) to rotate, thereby driving the second magnet assembly (103) to rotate. The sensing component (104) is correspondingly arranged with the second magnet component (103), and the sensing component (104) can generate electrical energy when the second magnet component (103) rotates; The circuit board assembly (105) is used to receive electrical energy generated by the sensing assembly (104) and to power the speed measuring device.

2. The speed measuring device according to claim 1, wherein, The circuit board assembly (105) is also used to receive and process the electrical signals generated by the sensing assembly (104).

3. The speed measuring device according to claim 2, wherein, Also includes: A plug (106) is used to transmit the processed electrical signal to an external device.

4. The speed measuring device according to any one of claims 1 to 3, wherein, Also includes: A bearing (107) is disposed outside at least a portion of the shaft assembly (102) and is used to support the rotation of the shaft assembly (102).

5. The speed measuring device according to claim 4, wherein, Also includes: The bearing retainer (108) and the locking member (109) are used to limit the axial position of the bearing (107).

6. The speed measuring device according to claim 1, wherein, The second magnet assembly (103) includes a multipole magnet with its magnetic poles alternately distributed circumferentially.

7. The speed measuring device according to claim 6, wherein, Also includes: A bracket (110) is used to fix the speed measuring device.

8. The speed measuring device according to claim 7, wherein, Also includes: A housing (111) is disposed outside at least a portion of the speed measuring device.

9. The speed measuring device according to claim 8, wherein, Also includes: The rear cover (112) and the housing (111) form a sealing structure that seals at least a portion of the components of the speed measuring device.

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