Method for simultaneously outputting two independent frequency pulses and such a speed sensor

Abstract

A method and a speed sensor capable of simultaneously outputting two independent frequency pulses. Two sensors of the same type or different types are integrally installed in the same installation space. The moving parts of the two sensors are parallelly installed on the same moving axis, and the sensing parts are arranged near the corresponding moving parts. The rotation of the same moving axis drives the two moving parts to rotate simultaneously, and the two sets of sensing parts output pulse signals with independent frequencies at the same time. It is possible to select to output two different frequency pulses to meet the requirements of different systems for different frequency pulses.

Description

Technical Field

[0001] The present invention relates to a pulse output method and a speed sensor, and more particularly to a method capable of simultaneously outputting two independent frequency pulses and such a speed sensor. Background Art

[0002] During the operation of a train, a speed sensor is required to measure the speed in real time and send out pulses to the control system for real-time monitoring of the train condition. Currently, the commonly adopted method is to install a sensor at the axle box end cover. Almost all used optoelectronic sensors for speed measurement in the early stage, and later Hall sensors were also used. The rotation of the axle drives the grating disk or the speed measurement gear to rotate, and a signal of 200 pulses per revolution is output. For example, the utility model patent with the application number CN201821835563.2 and the name "A locomotive speed sensor" uses a Hall sensor as the speed sensor, fixes a gear on the main shaft, and sets the induction probe on the circumferential outer side of the gear to output a pulse signal of one frequency. Another example is the invention patent with the application number CN201711182134.X and the name "Wheel speed sensor, detection device and axle state detection method", which also uses a Hall sensor as the speed sensor, and the induction probe is also set on the circumferential outer side of the gear, only outputting a pulse signal of one frequency.

[0003] Currently, with the use of the new generation of LKJ system, the required signal is 72 pulses per revolution, while the signal requirements of other systems are still 200 pulses per revolution. The traditional speed sensor that only outputs a pulse signal of one frequency can no longer meet the usage requirements. Moreover, due to the large number of components and the compact structure on the train, it is impossible to install a separate sensor additionally without changing the current structure.

[0004] Therefore, a special method and structure are needed to output two different frequencies of pulses without changing the current vehicle structure to meet the current usage requirements. Summary of the Invention

[0005] Aiming at the problem that the current speed sensor can only output a pulse signal of one frequency and cannot meet the usage requirements, the present invention proposes a method capable of simultaneously outputting two independent frequency pulses and such a speed sensor, and provides two different frequencies of pulses for different systems at the same time.

[0006] The technical means adopted by the present invention to solve the above problems is: a method for simultaneously outputting two independent frequency pulses, integrating two sensors and installing them in one installation space, and driving the two sensors to independently output pulse signals corresponding to their respective frequencies through the rotation of the same moving shaft.

[0007] Further, the moving parts of the two sensors are installed in parallel on the same moving axis and rotate following the moving axis, and the corresponding two sets of sensing parts are arranged near the corresponding moving parts to receive sensing and independently output signals.

[0008] Further, one of the two sensors is a Hall sensor, and the sensing part of the Hall sensor is arranged at one side of the gear, and the probe approaches the gear from a single side of the gear and receives sensing to reduce the space occupied by the Hall sensor in the circumferential direction.

[0009] A speed sensor that simultaneously outputs two independent frequency pulses, including two sensors, an upper cover, a fixed seat, and a moving axis that passes through the middle of the fixed seat and can rotate relative to the fixed seat. The two sensors respectively include moving parts and sensing parts, and are all arranged in the space enclosed by the upper cover and the fixed seat. The two moving parts are arranged in parallel on the moving axis and rotate together with the moving axis. The two sets of sensing parts are fixed on the fixed seat and are respectively close to their corresponding moving parts.

[0010] Further, one of the sensors is a Hall sensor, including a gear and its sensing part, and the sensing part is arranged at one side of the gear.

[0011] Further, the teeth of the gear are arranged on the side close to the sensing part.

[0012] Further, a fixing plate is also fixedly arranged in the fixed seat, and the sensing part of one of the sensors is fixedly arranged at the axial side of the fixing plate.

[0013] Further, the sensing part includes a probe and a circuit board, and the probe and the circuit board are separately arranged on the fixing plate.

[0014] Further, the fixing plate is integrally an annular shape with a notch, and the sensing part of the other sensor is fixedly arranged at the notch of the fixing plate.

[0015] Further, a cable port is also arranged at the circumferential position of the fixed seat.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. By integrating the two sensors in the same space, the present invention uses the same moving axis to drive the two sensors to simultaneously output two independent frequency pulses, and can select to output two different frequency pulses to meet the requirements of different systems for different frequency pulses.

[0018] 2. By arranging teeth on a single side of the gear and arranging the sensing part at this side, the present invention rationally utilizes the limited position, greatly reduces the space occupied by the entire Hall sensor in the circumferential direction, and makes the entire sensor more compact.

[0019] 3. The present invention integrally forms the fixing plate into an annular shape with an opening, and arranges the sensing component of one sensor on one surface so that it can be as close as possible to its corresponding moving component, while arranging the sensing component of the other sensor at the opening to provide sufficient installation space for this sensing component, further improving the compactness of the entire sensor.

[0020] 4. In the sensor of the present invention, both the moving component and the sensing component are completely installed and fixed before the cover is closed. The distance between the sensing component and the moving component is fixed in a completely open environment to ensure that the sensing component can receive the sensing signal, which not only simplifies the installation but also improves the sensitivity of the sensor sensing and ensures the correctness of the output signal. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the external structure of the first embodiment;

[0022] Figure 2 is Figure 1 a schematic diagram of the structure after removing the upper cover;

[0023] Figure 3 It is a schematic diagram of the internal structure of the first embodiment;

[0024] Figure 4 It is a schematic diagram of the structure after removing the Hall sensor in the first embodiment;

[0025] Figure 5 It is a schematic diagram of the installation structure of the Hall sensor in the first embodiment;

[0026] Figure 6 It is a schematic diagram of the gear structure in the first embodiment;

[0027] Figure 7 It is a schematic diagram of the fixing plate structure in the first embodiment;

[0028] Figure 8 It is a schematic diagram of the fixed seat structure in the first embodiment;

[0029] Figure 9 It is a schematic diagram of the circuit board arrangement of the Hall sensor in the first embodiment;

[0030] Figure 10 It is a schematic diagram of the assembly structure between the fixed seat and the moving shaft in the first embodiment;

[0031] In the figure: 1. Fixed seat, 11. Connecting body, 12. Boss, 13. Fixing plate, 131. First fixing hole, 132. Second fixing hole, 133. Protrusion, 2. Upper cover, 3. Cable sleeve, 4. Square tenon, 41. Universal shaft, 5. Moving shaft, 51. Fixing nut, 6. Gear, 61. Probe, 62. Circuit board, 7. Grating disk, 71. Photoelectric module box, 8. Bearing. Detailed implementation mode

[0032] The present invention will be further described below with reference to the accompanying drawings.

[0033] Embodiment 1

[0034] This embodiment is a speed sensor for a train that can simultaneously output two independent frequency pulses, including a photoelectric sensor and a Hall sensor. As Figure 1 shown, the two sensors are encapsulated in a narrow space surrounded by a fixed seat 1 and an upper cover 2. A square tenon 4 is provided on the outer side of the axial direction of the fixed seat 1 and is connected to the inside of the axle box of the train and moves along with the movement of the train wheelset. A cable sleeve 3 is provided on the circumferential side surface of the fixed seat 1, and the signals generated by the sensors are transmitted to the corresponding system of the train through the cable provided in the cable sleeve 3. In this embodiment, the setting of the cable is not shown in the figure and can be set in an existing manner.

[0035] As Figure 2 shown, the fixed seat 1 is an annular body with a through hole in the middle. One side surface of it is a plane and is fixedly connected to the axle box end cover through this plane. There is a concave hole in the other side surface. The moving shaft 5 passes through the through hole and extends out of the concave hole. A fixing plate 13 surrounding the moving shaft 5 is fixedly provided in the concave hole of the fixed seat 1.

[0036] As Figure 7 shown, the fixing plate 13 is a non-closed annular structure with a notch in the circumferential direction. The moving shaft 5 passes through the center of the ring of the fixing plate 13. Both the fixed seat 1 and the fixing plate 13 are relatively stationary with respect to the axle box end cover. As Figure 10 shown, the fixed seat 1 and the moving shaft 5 are matched through a bearing 8. The bearing 8 can adopt an existing structure, and the assembly method of the fixed seat 1 and the moving shaft 5 on the bearing 8 also follows the existing installation method. In this embodiment, the photoelectric sensor outputs two signals, and only one photoelectric module box 71 is provided, which is arranged at the notch of the fixing plate 13. Since the installation space of the photoelectric module box 71 is relatively large in this embodiment, its circuit board and the optical interrupter are all integrated inside. The Hall sensor outputs six signals and is provided with three sets of induction components. Since the number of its induction components is large and it will occupy too much space if integrated together, therefore, its induction components are split into corresponding probes 61 and circuit boards 62 and are separately arranged on the fixing plate 13 to save space. As Figure 7 shown, three fixing holes 131 are provided on one side surface of the fixing plate 13. Figure 3As shown in the figure, three probes 61 are respectively fixed in three first fixing holes 131 of the fixing plate 13. Additionally, on the circumferential surface of the fixing plate 13, there are second fixing holes 132 communicating with the first fixing holes 131. After a bolt or other fixing rod passes through the second fixing holes 132, the probes 61 are fixed on the fixing plate 13 to avoid relative movement, ensuring the accuracy of induction. As Figure 9 As shown in the figure, in this embodiment, multiple circuit boards 3 are respectively arranged on the upper and lower surfaces of the fixing plate, making rational use of space to integrate all components. When the same number of pulses is output, the diameter of the grating disk 7 of the photoelectric sensor is much smaller than the diameter of the gear 6 of the Hall sensor. In this embodiment, in order to be able to install the Hall sensor and the photoelectric sensor simultaneously in the narrow space at the shaft end and ensure that both the Hall sensor and the photoelectric sensor can output pulse signals meeting the requirements, as Figure 4 As shown in the figure, the grating disk 7 is fixedly arranged at a position on the moving shaft 5 close to the fixing plate 13. The photosensitive probe 71 protrudes above the fixing plate 13 from the notch of the fixing plate 13 and then approaches the grating disk 7, receiving induction as the grating disk 7 rotates and outputting pulses. As Figure 5 As shown in the figure, the gear 6 is arranged at one end of the moving shaft 5 far from the fixing plate 13, and a fixing nut 51 is provided at the end of the moving shaft 5 to prevent the gear 6 from falling out. The probe 61 is fixed on a side surface of the gear 6 along the radial direction through the fixing plate 13. At the same time, the fixing plate 13 also plays a role in lifting the probe 61, making the probe 61 as close as possible to the gear 6 to receive induction. As Figure 6 As shown in the figure, in order to ensure the strength of the gear 6 and ensure that the probe 61 can definitely receive induction, teeth are arranged on the side surface of the gear 6 close to the probe 61. For the convenience of processing, the position of the gear 6 close to the central hole is milled into a concave part, and teeth are machined around the concave part, that is, teeth are machined circumferentially only on the part of one side surface of the gear 6 close to the outer periphery. And as Figure 3 As shown in the figure, overall, the grating disk 7, the photoelectric module box 71, the probe 61, and the circuit board 62 are all located on one side surface of the gear 6. By reasonably integrating and arranging the components of the two sensors, the diameter of the gear 6 can be made as large as possible, and the number of teeth on the gear 6 can be made as many as possible. Therefore, the Hall sensor can output signals with as many pulses as possible.

[0037] As Figure 8 As shown in the figure, a rectangular connecting body 11 is provided on the outer peripheral side of the ring of the fixed seat 1. The cable sleeve 3 is connected through the connecting body 11, and there is a through hole in the connecting body 11 that extends straight into the concave hole of the fixed seat 1. In this way, the cable connected to the sensor is connected to the outside, and the generated pulse signal is transmitted to the monitoring system.

[0038] In order to prevent the circuit board 62 from being damaged during the installation process of the fixing plate 13 after being installed on the fixing plate 13, as Figure 8As shown in the figure, within the fixed base 1, there are three convex platforms 12. Correspondingly, on the outer periphery of the fixed plate 13, there are also three protrusions 133. After positioning the fixed plate 13 on the fixed base 1 through the cooperation of the protrusions 133 and the convex platforms 12, the space below the fixed plate 13 is hollow, so the circuit board 62 will not be squeezed.

[0039] The above embodiment adopts the combination of a Hall sensor and an optoelectronic sensor. Structurally speaking, this is a relatively good combination mode. Of course, other combination modes of sensors can also be selected, such as using two optoelectronic sensors or two Hall sensors. Moreover, the assembly of each component is not limited to the above structure. For example, the circuits of multiple Hall sensors can be integrated on a larger circuit board to facilitate the arrangement of cables; when the strength can be guaranteed, the gear can also be designed in the shape of a conventional gear, and so on.

[0040] It can be seen from the above embodiments that the present invention also relates to a method for simultaneously outputting two independent frequency pulses. Two sensors of the same type or different types are integrally installed in the same installation space. The moving parts of the two sensors are parallelly installed on the same moving axis, and the sensing parts are arranged near the corresponding moving parts. The rotation of the same moving axis drives the two moving parts to rotate simultaneously, and the two sets of sensing parts simultaneously output pulse signals with independent frequencies, usually outputting two different frequencies of signals to meet the requirements of the external system for different frequencies.

[0041] The above embodiments are only for illustrating the present invention, rather than limiting the present invention. Those skilled in the relevant technical field can also make various changes or transformations without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the protection scope of the present invention, and the protection scope of the present invention should be defined by each claim.

Claims

1. A speed sensor that simultaneously outputs two independent frequency pulses, characterized in that: It includes a photoelectric sensor and a Hall sensor. The two sensors are encapsulated in a narrow space surrounded by a fixed seat (1) and an upper cover (2). A square tenon (4) is provided on the axial outer side of the fixed seat (1) and connected to the inside of the axle box of the train, and moves along with the movement of the train wheelset. The fixed seat (1) is an annular body with a through hole in the middle. One side of it is a plane, and it is fixedly connected to the axle box end cover through this plane. There is a concave hole in the other side. The moving shaft (5) passes through the through hole and extends out of the concave hole. A fixing plate (13) surrounding the moving shaft (5) is fixedly arranged in the concave hole of the fixed seat (1). The fixing plate (13) is a non-closed annular structure with a notch in the circumferential direction. The moving shaft (5) passes through the center of the ring of the fixing plate (13). Both the fixed seat (1) and the fixing plate (13) are relatively stationary with respect to the axle box end cover. The fixed seat (1) and the moving shaft (5) are fitted through a bearing (8). The photoelectric sensor outputs two signals. There is only one photoelectric module box (71), which is arranged at the notch of the fixing plate (13); the Hall sensor outputs six signals. There are three sets of induction components, and the induction components are split into corresponding probes (61) and circuit boards (62). The three probes (61) are respectively fixed in three fixing holes one (131) of the fixing plate (13), and multiple circuit boards (62) are respectively arranged on the upper and lower two surfaces of the fixing plate; the grating disk (7) is fixedly arranged on the moving shaft (5) at a position close to the fixing plate (13). The photosensitive probe (71) protrudes above the fixing plate (13) from the notch of the fixing plate (13) and is close to the grating disk (7); the gear (6) is arranged at one end of the moving shaft (5) far from the fixing plate (13), and a fixing nut (51) is provided at the end of the moving shaft (5); the probe (61) is fixed on a side surface of the gear (6) along the radial direction through the fixing plate (13), and teeth are arranged on the side surface of the gear (6) close to the probe (61).

2. The speed sensor that simultaneously outputs two independent frequency pulses as described in claim 1, wherein: A cable port is also provided at the circumferential position of the fixed seat (1).

3. A method for simultaneously outputting two independent frequency pulses by using the speed sensor according to claim 1, characterized in that: The two sensors are integrally installed in an installation space, and the rotation of the same moving shaft (5) drives the two sensors to independently output pulse signals corresponding to their respective frequencies; The moving parts of the two sensors are installed in parallel on the same moving shaft (5) and rotate along with the moving shaft (5). The corresponding two sets of induction components are arranged near the corresponding moving parts to receive induction and independently output signals; One of the two sensors is a Hall sensor, and the induction component of the Hall sensor is arranged on a side surface of the gear (6), and the probe (61) approaches the gear (6) from a single side surface of the gear (6) to receive induction, so as to reduce the space occupied by the Hall sensor in the circumferential direction.

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