Testing device for speed sensors

Abstract

The present invention provides a test device for a speed sensor, which mainly consists of a base, a turntable rotatably arranged on the base, a plurality of magnetically conductive metal teeth evenly distributed at equal intervals along the circumference of the turntable, a plurality of magnets arranged on the turntable, and a driving device arranged below the base and used to drive the turntable to rotate. Among them, the magnetically conductive metal teeth are used to be sensed by the first speed sensor to be detected. Each magnet is arranged in an equidistant manner around the center of the turntable with a preset distance as the radius, and is used to be sensed by the second speed sensor to be detected. Compared with the prior art, the test device for a speed sensor provided by the present application can realize different types of speed sensors, improve the test efficiency, and reduce the test cost.

Description

Technical Field

[0001] The present invention relates to a testing device, and in particular to a testing device for a speed sensor. Background Art

[0002] In a mine, such as a coal mine, various devices need to be equipped with speed sensors and the like to test the mine environment. Therefore, the accuracy of the speed sensor is crucial for the measurement accuracy of related devices.

[0003] Since the measurement accuracies of speed sensors produced by different manufacturers are different, a corresponding speed testing platform is needed to measure them. Speed sensors usually include various types of speed sensors, such as magnetoelectric speed sensors, Hall speed sensors, etc.

[0004] In the prior art, usually a corresponding testing platform is separately built for different types of speed sensors for testing, which not only increases the use cost, but also has a relatively low testing efficiency.

[0005] Therefore, how to provide a testing device for a speed sensor, which can realize the testing of different types of speed sensors, improve the testing efficiency and reduce the testing cost, is a technical problem that the present invention urgently needs to solve. Summary of the Invention

[0006] The purpose of the present invention is to provide a testing device for a speed sensor, which can realize the testing of different types of speed sensors, improve the testing efficiency and reduce the testing cost.

[0007] To achieve the above purpose, the present invention provides a testing device for a speed sensor, including:

[0008] A base;

[0009] A turntable rotatably arranged on the base;

[0010] A plurality of magnetically conductive metal teeth evenly distributed at equal intervals along the circumference of the turntable, for being sensed by a first speed sensor to be detected;

[0011] A plurality of magnets arranged on the turntable, and each magnet is arranged in an equidistant manner around the center of the turntable with a preset distance as the radius, for being sensed by a second speed sensor to be detected;

[0012] A first driving device arranged below the base and used to drive the turntable to rotate.

[0013] Further preferably, the turntable includes: a first body provided with the magnetically conductive metal teeth, and a second body detachably connected to the first body and provided with the magnet; wherein, the second body is formed of an annular insulator or a non-magnetically conductive metal, and a supporting portion for supporting the first body extends outward in the circumferential direction thereof.

[0014] Further preferably, the magnet is a permanent magnet.

[0015] Further preferably, the preset distance is less than two-thirds of the radius of the turntable.

[0016] Further preferably, it further includes: a protective cover disposed on the base and used to cover the turntable, a driving motor disposed in the base and used to drive the turntable to rotate and electrically connected to the control device, a servo driver electrically connected to the driving motor, and a display device electrically connected to the control device; wherein, hollow areas for placing the speed sensors to be detected are provided in the circumferential direction and at the top of the protective cover.

[0017] Further preferably, a clamping device for clamping the first speed sensor and / or the second speed sensor; a second driving device connected to the clamping device and used to drive the clamping device is used to move the speed sensor from the outside to a preset detection station.

[0018] Further preferably, the clamping device includes: jaws for clamping the first speed sensor and / or the second speed sensor, a locking assembly for controlling the jaws to release and open, and a transmission shaft connected to the jaws and used to connect to the second driving device; wherein, the jaws include: a first half part and a second half part connected to the first half part, and at least one of the first half part and the second half part is connected to the second driving device.

[0019] Further preferably, the second driving device includes: a transmission mechanism connected to the transmission shaft and used to make the transmission shaft move along a preset trajectory to reach a preset first detection station and a second detection station, and a driving motor for driving the transmission mechanism to move; wherein, the transmission mechanism includes: a rocker component with one end connected to the driving shaft of the driving motor, a first swing rod component, and a second swing rod component with the tail end connected to a fixed bracket, wherein, the rocker component, the first swing rod component, and the second swing rod component are sequentially connected end to end; the transmission shaft is at least connected to the first swing rod component and / or the second swing rod component.

[0020] Further preferably, through holes are formed in the pivot shafts of the first swing rod member and the second swing rod member for inserting the transmission shaft; wherein, the tail of the transmission shaft passes through the through holes and is fixedly connected to the drive shaft of the rotation shaft motor; wherein, the rotation shaft motor is fixed on the second swing rod member and is used for driving the transmission shaft to rotate from a preset first detection station to a preset second detection station.

[0021] Further preferably, it further includes: a limit bracket arranged on the base, wherein, an arc-shaped groove for the transmission shaft to pass through is formed on the limit bracket so that the clamping jaw moves along a preset track.

[0022] Compared with the prior art, the test device for a speed sensor provided by the present application can test different types of speed sensors, improve the test efficiency and reduce the test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of the test device for a speed sensor in the first embodiment of the present invention;

[0024] Figure 2 It is a schematic structural diagram of the test device for a speed sensor in the first embodiment of the present invention;

[0025] Figure 3 It is a schematic partial structural diagram of a preferred test device for a speed sensor in the first embodiment of the present invention;

[0026] Figure 4 It is a schematic diagram of the state when the first detection station reaches the first preset station in the first embodiment of the present invention;

[0027] Figure 5 It is a schematic diagram of the state when the first detection station reaches the second preset station in the first embodiment of the present invention;

[0028] Figure 6 It is a schematic side structural diagram of a preferred test device for a speed sensor in the first embodiment of the present invention;

[0029] Figure 7 It is a schematic structural diagram of the turntable in the first embodiment of the present invention;

[0030] Figure 8 It is a schematic structural diagram of the second body in the first embodiment of the present invention;

[0031] Description of reference numerals: base 1, turntable 10, first body 10a, second body 10b, supporting part 103, mounting hole 1031, magnetically conductive metal teeth 101, magnet 102, protective cover 2, hollow area 21, base 102, first speed sensor 3, second speed sensor 5, jaw 61, transmission shaft 62, limit bracket 63, limit groove 631, drive motor 7, transmission mechanism 8, substrate 80, rocker member 81, first swing rod member 82, second swing rod member 83, fixing frame 85, fixing bracket 86, through hole 800, rotating shaft motor 9. Detailed implementation

[0032] The test device for a speed sensor according to the present invention will be described in more detail below with reference to the schematic diagrams, in which the preferred embodiments of the present invention are shown. It should be understood that those skilled in the art can modify the present invention described herein while still achieving the advantageous effects of the present invention. Therefore, the following description should be understood as broad knowledge for those skilled in the art and not as a limitation to the present invention.

[0033] Embodiment 1

[0034] This embodiment provides a test device for a speed sensor, as Figures 1 to 8 shown, which mainly consists of a base 1, a turntable 10 rotatably arranged on the base 1, a plurality of magnetically conductive metal teeth 101 equidistantly distributed along the circumference of the turntable 10, a plurality of magnets 102 arranged on the turntable 10, and a first driving device arranged below the base 1 for driving the turntable 10 to rotate.

[0035] Among them, the magnetically conductive metal teeth 101 are used to be sensed by the first speed sensor 3 to be detected.

[0036] Each magnet 102 is arranged equidistantly in a circular manner with the center of the turntable 10 as the center and a preset distance as the radius, and is used to be sensed by the second speed sensor 5 to be detected. Here, it should be noted that the magnetically conductive metal teeth 101 in this embodiment can preferably be composed of any one of Fe, Co, and Ni.

[0037] With the above structure, when testing the first speed sensor 3, for example, a magnetoelectric sensor is arranged at a corresponding first detection station on the magnet 102. The first driving device drives each magnet 102 to rotate in sequence, so as to be sensed by the first speed sensor 3. As a result, the measuring device electrically connected to the first speed sensor 3 collects corresponding signals to measure and analyze the first speed sensor 3. When testing the second speed sensor 5, for example, a Hall sensor is arranged at a corresponding second detection station on the magnet 102. The first driving device drives the turntable 10 to rotate, so that each magnetically conductive metal tooth 101 rotates in sequence, and thus is sensed by the second speed sensor 5. As a result, the measuring device electrically connected to the second speed sensor 5 collects corresponding signals to measure and analyze the second speed sensor 5. Therefore, by using a platform device, the testing of different types of speed sensors can be realized, the testing efficiency can be improved, and the testing cost can be reduced. Here, it should be noted that the first speed sensor 3 and the second speed sensor 5 in this embodiment can be fixed on the base 1 through corresponding fixing brackets, such as universal clamps, and are electrically connected to the corresponding oscilloscope analyzer and control device to analyze the signals obtained by the speed sensors. In addition, it should be noted that the first speed sensor 3 in this embodiment can also be a magnetoresistive sensor or an eddy current sensor.

[0038] Specifically, in order to meet the assembly requirements in practical applications, the turntable 10 in this embodiment may include a first body 10a provided with the magnetically conductive metal teeth and a second body 10b detachably connected to the first body 10a and provided with the magnets. The second body 10b is formed by a ring-shaped insulator or a non-magnetically conductive metal, and a supporting portion 103 for supporting the first body 10a extends outward in the circumferential direction thereof, and corresponding mounting holes 1031 are formed in the supporting portion 103.

[0039] By connecting the first body 10a pre-provided with the magnetically conductive metal teeth 101 to the supporting portion 103 of the second body 10b through corresponding fasteners 105 in a way that enables synchronous rotation, it is convenient to arrange the magnetically conductive metal teeth 101 along the circumference of the turntable 10, and enables each magnetically conductive metal tooth 101 to be preferably located in the same plane, and prevents the first body 10a and the second body 10b from separating from each other, so as to simplify the structure and reduce the manufacturing cost. Moreover, since the second body 10b is formed by a ring-shaped insulator or a non-magnetically conductive metal, it can preferably avoid mutual interference between the magnetically conductive metal teeth 101 and the magnets 102 when testing the corresponding speed sensors.

[0040] Further preferably, the non-magnetic metal in this embodiment is aluminum metal with a magnetic permeability of 0, so that the main body of the turntable 10 is an aluminum component, which is not only light in weight but also has good non-magnetic properties. In addition, since the turntable 10 is an aluminum metal component, it can be well integrally formed or closely combined with the magnetic conductive metal teeth. Obviously, the magnetic conductive metal teeth in this embodiment can also be arranged on the turntable 10 according to requirements, such as by welding, which will not be elaborated here. Wherein, a plurality of circular grooves for arranging the magnets 102 can be formed on the turntable 10 along its circumferential direction. After the magnet 102 is arranged in the circular groove body, it is fixedly installed through fasteners 106 such as hexagon socket head cap screws.

[0041] Further preferably, the magnet 102 is a magnetic steel, which can be synthesized by iron and aluminum, nickel, cobalt, etc., or a super-hard permanent magnet alloy synthesized by copper, niobium, tantalum, etc., to improve the accuracy of the test. In addition, in order to avoid interference between the magnet 102 and the magnetic conductive metal teeth 101, the magnet 102 in this embodiment is preferably a super-hard permanent magnet alloy synthesized by copper, niobium, tantalum, etc., to improve the measurement accuracy.

[0042] In addition, the magnetic poles of two adjacent magnets 102 exposed to the outside in this example are opposite or the same.

[0043] In addition, it is worth mentioning that the number of the magnets 102 in this embodiment is preferably 18, and the number of the magnetic conductive metal teeth 101 is preferably 120.

[0044] Further preferably, the preset distance is less than two-thirds of the radius of the turntable 10 to further avoid mutual interference between the magnetic conductive metal teeth 101 and the magnet.

[0045] Further preferably, the test device for the speed sensor further includes: a protective cover 2 arranged on the base 1 and used to cover the turntable 10. Wherein, hollow areas 21 for arranging the speed sensor to be detected are formed in the circumferential direction and the top of the protective cover 2. Through this structure, it is prevented that the operator accidentally touches the magnetic conductive metal teeth 101, and at the same time, it plays a role of magnetic field shielding to eliminate external interference.

[0046] Further preferably, for the convenience of controlling the turntable and performing operations, the test device for the speed sensor further includes: a drive motor 108 disposed in the base 1 and electrically connected for driving the turntable 10 to rotate, a servo driver (not labeled in the figure) electrically connected to the drive motor 108 and the control device, and a display device 14 electrically connected to the control device. The precise control of the rotational speed and angle of the drive motor can be achieved through the servo driver. Among them, the drive shaft of the drive motor 108 is coaxially arranged with the center of the turntable 10. The rotational speed of the turntable and the information of the corresponding speed sensor can be displayed through the display device 14 for convenient operation.

[0047] Further preferably, the control device in this embodiment further includes: control buttons electrically connected to the servo driver, where the control buttons include: an emergency stop button 11, a voltage switch button 12, a clockwise rotation button 12, and a counterclockwise rotation button 14, etc. Through each control button, the control of the speed and steering speed of the turntable can be very convenient, which is beneficial to the test of the speed sensor.

[0048] In addition, to illustrate the working principle of the test device for the speed sensor in this embodiment, the following description is made:

[0049] Correspondence between rotational speed and output signal and measurement process

[0050] The maximum rotational speed of the speed disk nmax = 6000 r / min

[0051] I. Magnetoelectric sensor

[0052] 1.1 The formula for the correspondence between the output (frequency) signal and the rotational speed is as follows:

[0053]

[0054] 1.2 Test method:

[0055] When the tooth valleys and tooth tops of the turntable alternately pass through the sensor with a permanent magnet and a coil, an alternating magnetic field will be generated, causing a sinusoidal induced voltage to be generated in the coil. Therefore, the sensor and the speed disk, that is, the toothed structure composed of multiple magnetically conductive metal teeth in the above turntable, are installed facing each other, and the gap should not be too large, generally between 0.3 - 2 mm. No less than 5 test points are selected for the test, including the upper and lower limits of the measurement range, and they are evenly distributed.

[0056] Test 3 times in a cycle according to the following method:

[0057] Adjust the standard speed generating device to the lower limit value of the speed sensor to be measured, and then steadily increase the speed to the upper limit value. This process is one cycle, and during the process, the signal output values of the speed sensor at each test point are measured in turn with an oscilloscope.

[0058] 1.3 The corresponding relationship between the rotational speed and the output signal and an example of the calculation method are shown in the following table (the final output signal in the actual installation environment changes in direct proportion to the number of teeth):

[0059] II. Hall sensor

[0060] 2.1 The formula for the corresponding relationship between the output (frequency) signal and the rotational speed is as follows:

[0061]

[0062] 2.2 Test method:

[0063] When the Hall sensor is fixed near the magnetic body, after the magnetic body rotates, each time the magnet passes by the Hall sensor, the Hall sensor outputs a corresponding voltage pulse. By detecting the number of pulses per unit time, the measured rotational speed can be obtained. Therefore, during installation, the speed sensor and the rotational speed disk, that is, the side of the above-mentioned turntable, are vertically installed, aligned with the position of the magnetic steel ring, and the distance gap is generally within 10 mm. No less than 5 test points are selected for the test, including the upper and lower limits of the measurement range, and they are evenly distributed.

[0064] Test in the following method in a cycle for 3 times:

[0065] Adjust the standard speed generating device to the lower limit value of the measured speed sensor, and then steadily increase the speed to the upper limit value. This process is one cycle. During the process, use an oscilloscope to measure the signal output values of the speed sensor at each test point in turn.

[0066] 2.3 The corresponding relationship between the rotational speed and the output signal and an example of the calculation method are shown in the following table (the final output signal in the actual installation environment changes in direct proportion to the number of magnetic steels).

[0067] The test device for the speed sensor in this embodiment, such as Figure 2 and Figure 3 shown, further preferably, the clamping device for clamping the first speed sensor 3 and / or the second speed sensor 5 is also connected to the second driving device, and the second driving device is used to drive the speed sensor to move from the outside to a preset detection station.

[0068] Through the clamping device and the second driving device, the automatic switching of the detection stations of the first speed sensor 3 and the second speed sensor 5 can be realized, and there is no need for manual adjustment when replacing the first speed sensor 3 or the second speed sensor 5. Therefore, the detection efficiency can be improved.

[0069] Further preferably, the clamping device includes: a jaw 61 for clamping the first speed sensor 3 and / or the second speed sensor 5, a locking assembly for controlling the release and opening of the jaw 61, and a transmission shaft 62 connected to the jaw 61 and used for connecting to the second driving device; wherein, the jaw 61 includes: a first half and a second half connected to the first half, and at least one of the first half and the second half is connected to the second driving device. By means of this jaw, the first speed sensor 3 or the second speed sensor 5 can be clamped individually, or the first speed sensor 3 and the second speed sensor 5 can be clamped synchronously, and the measuring ends of the first speed sensor 3 and the second speed sensor 5 are both arranged facing outwards in the reverse direction. And it is worth mentioning that the locking assembly in this embodiment can be corresponding fasteners such as bolts. The first speed sensor 3 and the second speed sensor 5 can be first fixed to the corresponding brackets and then clamped by the jaw, or can also be directly clamped by the jaw.

[0070] Further preferably, the second driving device includes: a transmission mechanism 8 connected to the transmission shaft 62 and used for making the transmission shaft 62 move along a preset trajectory to reach a preset first detection station and a second detection station, and a driving motor 7 for driving the transmission mechanism 8 to move; wherein, the driving motor 7 is suspended by a fixing frame 85; the transmission mechanism 8 includes: a rocker member 81 with one end connected to the driving shaft of the driving motor 7, a first swing rod member 82, and a second swing rod member 83 with the tail end connected to a fixed bracket 86. Among them, the rocker member 81, the first swing rod member 82, and the second swing rod member 83 are sequentially hinged end to end to form a rocker driving mechanism; the transmission shaft 62 is at least connected to the first swing rod member 82 and / or the second swing rod member 83. In addition, in order to facilitate the installation of the transmission mechanism 82, a base plate 80 is also provided for detachably setting on the base 1, and the fixing frame 85 and the fixed bracket 86 are detachably set or welded on this base plate.

[0071] By driving the swing of the rocker member 81 by the driving motor 7, the first swing rod member 82 and the second swing rod member 83 can be driven to pivot, so that the transmission shaft 62 is driven along a preset trajectory.

[0072] Further preferably, through holes 800 are opened on the pivot shafts of the first swing rod member 81 and the second swing rod member 82 for inserting the transmission shaft 62; wherein, the tail of the transmission shaft 62 passes through the through hole 800 and is fixedly connected to the driving shaft of the rotating shaft motor 9; wherein, the rotating shaft motor 9 is fixed on the second swing rod member 83 and is used for driving the transmission shaft 62 from a preset first detection station (such as Figure 4 the station shown, that is Figure 3Rotate to a preset second detection station (such as the position shown by the middle transmission shaft 62). Figure 5 The station shown).

[0073] By rotating the transmission shaft 62 through the rotating shaft motor 9, the flipping of the jaw 61 can be realized, and the reverse setting of the first speed sensor 3 and the second speed sensor 5 can be achieved. This not only facilitates the adjustment of the measurement angles of the first speed sensor 3 and the second speed sensor 5, but also enables the first speed sensor 3 and the second speed sensor 5 to achieve automatic measurement without manual switching, further improving the measurement efficiency. In addition, the rotating shaft motor 9 can also play a role in balancing the jaw 61, avoiding the situation where the transmission shaft 62 is inclined and easily bent and deformed, so that the distance between the speed sensor and the magnetically permeable metal teeth 101 and the magnet 102 is maintained within a high-precision distance. Here, it should be noted that as a further preferred method, the actual shape of the hollow area 21 in the protective cover 2 in this embodiment can also be adjusted according to the actual situation to realize the movement trajectory of the transmission shaft 62. In addition, when the transmission shaft 62 rotates along a preset trajectory following the transmission mechanism 8, the rotation of the rotating shaft motor 6 can be used to simultaneously realize the flipping of the jaw driving the first speed sensor 3 and the second speed sensor 5 in the narrow space of the protective cover 2 without touching the side wall of the protective cover 2 and the magnetically permeable metal teeth 101, which facilitates the operation.

[0074] Further preferably, the test device for the speed sensor further includes a limit bracket 63 provided on the base 1. Among them, an arc-shaped groove for the transmission shaft 62 to pass through is provided on the limit bracket 63, so that the jaw 61 moves along a preset trajectory. The limit bracket 63 can further play a role in limiting and protecting the movement trajectory of the transmission shaft 62 to prevent the situation where the speed sensor on the jaw 61 touches the gear and is damaged due to the deformation of the transmission shaft 62. In addition, the limit bracket 63 can preferably be provided on the substrate 80.

[0075] The above is only the preferred embodiment of the present invention and does not impose any limitation on the present invention. Any person skilled in the art, within the scope of the technical solution of the present invention, makes any form of equivalent replacement or modification and other changes to the technical solution and technical content disclosed by the present invention, which are still within the content of the technical solution of the present invention and still fall within the protection scope of the present invention.

Claims

1. A test device for a speed sensor, characterized in that, Comprising: A base; A turntable rotatably arranged on the base; A plurality of magnetically conductive metal teeth evenly distributed at equal intervals along the circumference of the turntable, for being sensed by a first speed sensor to be detected; A plurality of magnets arranged on the turntable, and each magnet is centered on the center of the turntable and arranged in an equidistant manner in a circular shape with a preset distance as the radius, for being sensed by a second speed sensor to be detected; A first driving device arranged below the base and used to drive the turntable to rotate; It further includes a second driving device, and the second driving device includes: a transmission mechanism and a driving motor used to drive the transmission mechanism to move; wherein, the transmission mechanism includes: a rocker component with one end connected to the driving shaft of the driving motor, a first swing rod component, and a second swing rod component with the tail end connected to a fixed bracket, and the head and tail of the rocker component, the first swing rod component, and the second swing rod component are sequentially connected in a hinged manner; A clamping device, and the clamping device is used to clamp the first speed sensor and / or the second speed sensor; the transmission shaft on the clamping device is connected to the second driving device, and the second driving device drives the transmission shaft to move along a preset trajectory, and the transmission shaft is at least connected to the first swing rod component and / or the second swing rod component in the second driving device; Through holes are opened on the pivot shafts of the first swing rod component and the second swing rod component for inserting the transmission shaft; the tail of the transmission shaft passes through the through hole and is fixedly connected to the driving shaft of a rotating shaft motor; wherein, the rotating shaft motor is fixed on the second swing rod component and is used to drive the transmission shaft to rotate from a preset first detection station to a preset second detection station.

2. The test device for a speed sensor according to claim 1, characterized in that, The turntable includes: a first body provided with the magnetically conductive metal teeth, and a second body detachably connected to the first body and provided with the magnets; wherein, the second body is composed of a ring-shaped insulator or a non-magnetically conductive metal, and a supporting portion for supporting the first body extends outward in the circumferential direction.

3. The test device for a speed sensor according to claim 2, wherein, The magnet is a permanent magnet.

4. The test device for a speed sensor according to claim 2, wherein, The preset distance is less than two-thirds of the radius of the turntable.

5. The test device for a speed sensor according to claim 1, characterized in that, It further includes: A protective cover arranged on the base and used to cover the turntable, a driving motor arranged in the base and used to drive the turntable to rotate, a servo driver electrically connected to the driving motor and a control device, and a display device electrically connected to the control device; wherein, hollow areas for placing the speed sensor to be detected are opened on the circumference and the top of the protective cover.

6. The test device for a speed sensor according to claim 5, characterized in that, The second driving device connected to the clamping device and used to drive the clamping device is used to move the speed sensor from the outside to a preset detection station.

7. The test device for a speed sensor according to claim 6, characterized in that, The clamping device includes: jaws for clamping the first speed sensor and / or the second speed sensor, a locking component for controlling the jaws to release and open, and a transmission shaft connected to the jaws and used to connect to the second driving device; wherein, the jaws include: a first half part and a second half part connected to the first half part, and at least one of the first half part and the second half part is connected to the second driving device.

8. The test device for a speed sensor according to claim 7, characterized in that, It further includes: A limit bracket disposed on the base, wherein an arc-shaped groove for the transmission shaft to pass through is formed on the limit bracket, so that the clamping jaw moves along a preset track.

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