Coaxial photoelectric speed measuring device for towing tank trailer

Abstract

The invention relates to a coaxial photoelectric speed measuring device for a towing tank trailer. The coaxial photoelectric speed measuring device comprises two rack side plates, a U-shaped bearing plate, a wheel shaft, a speed measuring wheel, a photoelectric pulse generator, a square plate, a pincerlike plate, a fixing piece and two adjusting handles. The upper end and the lower end of the U-shaped bearing plate side plate are connected with the rack side plate through first pin shafts; the wheel shaft is rotationally mounted between two side plates of the U-shaped bearing plate through a bearing; the tachometer wheel and the grating disc are fixed on the wheel shaft; the upper ends and the lower ends of the two sides of the square plates are connected with the rack side plates through second pin shafts. The extending ends of the two pincer parts of the pincer-shaped plate are located on the two sides of the square plate respectively and connected with the square plate through third pin shafts. The two adjusting handles are arranged on the two sides of the connecting plate and are in threaded connection with the connecting plate. The two adjusting handles are rotated to adjust the intersection angle between the wheel shaft and the center line of the roller path to be 90 degrees, the speed measurement precision is guaranteed, the grating disc and the speed measurement wheel are both installed on the wheel shaft, and the coaxiality deviation and the internal friction torque of the grating disc and the speed measurement wheel are reduced.

Description

Technical Field

[0001] This invention belongs to the field of photoelectric speed measurement technology, and in particular relates to a coaxial photoelectric speed measuring device for towing a water tank trailer. Background Technology

[0002] A towing test tank is a tank specifically used for testing ship models or fishing gear models, to tow the models and measure parameters such as resistance at different speeds. The dimensions of the test tank determine the size of the model and the speed during the test.

[0003] Typically, a test tank trailer is equipped with four wheels and travels along tracks on both sides of the test tank's roof. The trailer serves various purposes: 1) As a towed model, maintaining its orientation and accelerating it to a certain speed, ensuring a consistent speed while measuring data. After each test, it is braked and towed back to the starting point for the next test. 2) Various measuring and recording instruments are mounted on the trailer, therefore the entire trailer should be resistant to vibration at any speed. To maintain the trailer's straight-line motion on the tracks, four pairs of transverse guide wheels are usually installed on a single plane on both sides of one side of the track to prevent deviation in the trailer's direction of movement. Two vertical planed planes on the track are used for the guide wheels. To ensure the trailer maintains a consistent speed during measurements, the track installation must be meticulous and equipped with adjustment devices, ensuring that the working surface is parallel to the horizontal plane with an error of approximately 0.1 mm and the lateral error is within 0.15 mm. The trailer's power unit is computer-controlled. During testing, the trailer speed, i.e., the speed reached by the boat model or net model, is generally measured and recorded by a photoelectric tachometer.

[0004] Currently, trailer speed is typically measured using photoelectric tachometers. The pulse device is usually installed at the rear end of the drive motor shaft, and the rotational speed of the drive motor shaft is converted into the trailer speed. While this method is relatively simple, the measured data such as trailer acceleration and instantaneous speed are easily affected by interference from drive factors such as gearbox speed changes and universal joint clearance. Therefore, a speed measuring device unaffected by these factors is needed to provide accurate speed data, thereby improving test precision. Summary of the Invention

[0005] The main objective of this invention is to provide a coaxial photoelectric speed measuring device for towing a water tank trailer, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A coaxial photoelectric speed measuring device for towing a water tank trailer, comprising:

[0008] The two frame side plates have a first mounting slot and a second mounting slot on their front and rear sides, respectively.

[0009] The U-shaped bearing plate has two side plates located in the first mounting slots of the two frame side plates, and the upper and lower ends of the U-shaped bearing plate side plates are connected to the frame side plates through the first pin.

[0010] The axle is rotatably mounted between the two side plates of the U-shaped bearing plate via a bearing;

[0011] The speed measuring wheel is fixed on the axle.

[0012] A photoelectric pulse generator is fixed on the outer side of the side plate of the U-shaped bearing plate. The photoelectric pulse generator includes a grating disk, which is fixed on the wheel axle.

[0013] A square plate has two sides located in the second mounting slots of the two frame side plates, and the upper and lower ends of both sides of the square plate are connected to the frame side plates through the second pins.

[0014] A clamp-shaped plate includes a middle plate and two clamp parts fixed to the lower sides of the middle plate and extending forward. The protruding ends of the two clamp parts are respectively located on both sides of the square plate and connected to the square plate by a third pin.

[0015] The fastener includes an upper plate and a lower plate, and a connecting plate connecting the upper plate and the lower plate. The upper plate and the lower plate are located on the upper and lower sides of the middle plate, respectively, and are connected to the middle plate by a fourth pin.

[0016] Two adjusting handles are located on both sides of the connecting plate and are threadedly connected to the connecting plate. The angle between the intermediate plate and the connecting plate can be changed by rotating the two adjusting handles to push against the intermediate plate.

[0017] Preferably, it further includes a pressure regulating component, the pressure regulating component comprising...

[0018] Two bolts are threaded through the square plate and connected to the intermediate plate.

[0019] Two springs are respectively fitted onto the two bolts and located between the square plate and the middle plate, with the two ends of the two springs abutting against the square plate and the middle plate respectively.

[0020] Preferably, it further includes a display controller, which is electrically connected to the photoelectric pulse generator.

[0021] Preferably, the rear side of the upper plate is provided with an opening and a positioning groove for connecting, fixing and positioning with the trailer.

[0022] Preferably, the side plates of the U-shaped bearing plate and the first mounting slot are both adapted to have a front-wide and rear-narrow structure.

[0023] This invention provides a coaxial photoelectric speed measuring device for towing a water tank trailer, which has the following beneficial effects;

[0024] 1. By rotating the two adjusting handles to push against the middle plate, the angle between it and the connecting plate is changed. After the direction of the middle plate is changed, the direction of the square plate can be changed through the two clamps, which in turn allows the two frame side plates to move back and forth. The back and forth movement of the two frame side plates can change the direction of the wheel axle. Repeatedly rotate the two adjusting handles to adjust the direction of the wheel axle until the angle between the wheel axle and the center line of the raceway approaches 90 degrees, so that the speed measuring wheel keeps rolling on the center line of the track, ensuring speed measurement accuracy. In this way, high-precision speed data can be measured by the photoelectric pulse generator.

[0025] 2. By rotating the bolt, the end of the device equipped with the speed measuring wheel can be moved up and down, thereby adjusting the pressure between the speed measuring wheel and the track, so that the pressure between the speed measuring wheel and the track is appropriate, ensuring that the speed measuring wheel rotates flexibly and the contact is stable.

[0026] 3. Both the grating disk and the speed measuring wheel are mounted on the wheel axle, that is, on the same main shaft. Compared with different shaft types connected by couplings, this reduces the coaxiality deviation and internal friction torque of the grating disk and the speed measuring wheel. While improving accuracy, the structure is simple and easy to install. Attached Figure Description

[0027] Figure 1 This is a perspective view of the coaxial photoelectric speed measuring device of the present invention.

[0028] Figure 2 This is a front view of the coaxial photoelectric speed measuring device of the present invention.

[0029] Figure 3 This is a schematic diagram of the connection structure of the display controller of the present invention.

[0030] In the diagram: 1. Side plate of the frame; 2. U-shaped bearing plate; 3. Axle; 4. Speed ​​measuring wheel; 5. Photoelectric pulse generator; 6. Square plate; 7. Clamp plate; 71. Middle plate; 72. Clamping part; 8. Fixing component; 81. Upper plate; 82. Lower plate; 83. Connecting plate; 9. Adjusting handle; 10. First pin; 11. Second pin; 12. Third pin; 13. Fourth pin; 14. Bolt; 15. Spring; 16. Display controller; 17. Opening; 18. Positioning groove. Detailed Implementation

[0031] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0033] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] Examples, such as Figure 1-3 As shown, a coaxial photoelectric speed measuring device for towing a pool trailer includes two frame side plates 1, a U-shaped bearing plate 2, a wheel axle 3, a speed measuring wheel 4, a photoelectric pulse generator 5, a square plate 6, a clamp plate 7, a fixing piece 8, and two adjusting handles 9.

[0035] The front and rear sides of the two frame side plates 1 are respectively provided with a first mounting slot and a second mounting slot. The two frame side plates 1 are 265mm long, 165mm wide, and 22mm thick.

[0036] The two side plates of the U-shaped bearing plate 2 are respectively located in the first mounting slots of the two frame side plates 1, and the upper and lower ends of the side plates of the U-shaped bearing plate 2 are connected to the frame side plates 1 through the first pin 10. The opening of the U-shaped bearing plate 2 faces forward. The side plates of the U-shaped bearing plate 2 and the first mounting slots are all adapted to a front-wide and back-narrow structure. It should be noted that the left side of the attached figure is the front side and the right side is the rear side.

[0037] The axle 3 is rotatably mounted between the two side plates of the U-shaped bearing plate 2 via a bearing. The axle 3 is 115mm long and 25mm in diameter.

[0038] The speed measuring wheel 4 is fixed to the axle 3. The speed measuring wheel 4 is made of 45# steel, with a width of 20mm and a diameter of 171.89mm. Its roundness tolerance should be controlled within 0.0035mm. After assembling the speed measuring wheel 4 with the axle 3, it is precision ground to make the circumference of the speed measuring wheel 4 as close as possible to the theoretical circumference of 540mm, with a deviation rate of less than 1.5×10⁻⁶ mm. -5 ;

[0039] The photoelectric pulse generator 5 is fixed to the outer side of the side plate of the U-shaped bearing plate 2. The photoelectric pulse generator 5 includes a grating disk, which is fixed to the wheel axle 3.

[0040] Specifically, the photoelectric pulse generator 5 includes a shielding shell with a diameter of 125mm, and a gallium arsenide infrared LED, a condenser lens, a grating disk, a phototransistor, and a circuit board encapsulated within the shielding shell. The grating disk has 5400 light-transmitting stripes etched along its circumference, thus generating 5400 pulses per revolution of the speed measuring wheel 4, with each pulse representing a stroke of 0.1mm for the speed measuring wheel 4. Both the grating disk and the speed measuring wheel 4 are mounted on the wheel axle 3, i.e., on the same main shaft. Compared to different shaft types connected by couplings, this reduces the coaxiality deviation and internal friction torque between the grating disk and the speed measuring wheel 4, improving accuracy while maintaining a simple structure and facilitating installation.

[0041] The square plate 6 is located in the second mounting slots of the two frame side plates 1 on both sides, and the upper and lower ends of the square plate 6 are connected to the frame side plates 1 through the second pin 11. The length and width of the square plate 6 are both 125mm.

[0042] The clamp plate 7 includes a middle plate 71 and two clamp parts 72 fixed to the lower sides of the middle plate 71 and extending forward. The protruding ends of the two clamp parts 72 are respectively located on both sides of the square plate 6 and connected to the square plate 6 through a third pin 12.

[0043] The fastener 8 includes an upper plate 81 and a lower plate 82, as well as a connecting plate 83 connecting the upper plate 81 and the lower plate 82. The upper plate 81 and the lower plate 82 are located on the upper and lower sides of the middle plate 71 respectively and are connected to the middle plate 71 by a fourth pin 13. The upper plate 81 is 80mm long and 125mm wide. The rear side of the upper plate 81 is provided with a φ14mm opening 17 and a positioning groove 18 for connecting, fixing and positioning with the trailer.

[0044] Two adjusting handles 9 are located on both sides of the connecting plate 83 and are threadedly connected to the connecting plate 83. The angle between the intermediate plate 71 and the connecting plate 83 can be changed by rotating the two adjusting handles 9 to push against the intermediate plate 71.

[0045] In this invention, all pins are used as rotatable connections.

[0046] The working principle of this invention is as follows: the device is installed under the trailer by the fixing part 8, so that the speed measuring wheel 4 rolls on the top plane of the track. In order to ensure that the measured speed matches the actual trailer speed and thus obtain high-precision speed data, the angle between the wheel axle 3 and the center line of the track is required to be close to 90 degrees, that is, the speed measuring wheel 4 keeps rolling on the center line of the track. During speed measurement, the trailer is started. If the speed measuring wheel 4 deviates to one side of the top plane of the track after traveling a certain distance, it indicates that the wheel axle 3 is not at a 90-degree angle with the center line of the track and needs to be adjusted. At this time, the angle between the intermediate plate 71 and the connecting plate 83 can be changed by rotating the two adjusting handles 9 to push against the intermediate plate 71. After the direction of the intermediate plate 71 is changed, the direction of the square plate 6 can be changed by the two clamps 72, which in turn allows the two frame side plates 1 to move back and forth relative to each other. Repeatedly rotate the two adjusting handles 9 to test until the wheel axle 3 does not deviate to one side of the top plane of the track, that is, the angle between it and the center line of the raceway tends to be 90 degrees, so that the speed measuring wheel 4 keeps rolling on the center line of the track and ensures the speed measurement accuracy. In this way, high-precision speed data can be measured by the photoelectric pulse generator 5.

[0047] In one specific embodiment, a pressure regulating component is also included, comprising two bolts 14 and two springs 15. The two bolts 14 pass through the square plate 6 and are threadedly connected to the intermediate plate 71. The two springs 15 are respectively sleeved on the two bolts 14 and located between the square plate 6 and the intermediate plate 71, with their ends respectively abutting against the square plate 6 and the intermediate plate 71. By rotating the bolts 14, the end of the device equipped with the speed measuring wheel 4 can be controlled to move up and down, thereby adjusting the pressure between the speed measuring wheel 4 and the track. This ensures that the pressure between the speed measuring wheel 4 and the track is appropriate, guaranteeing that the speed measuring wheel 4 rotates flexibly and makes stable contact, without spinning freely, but also without excessive pressure affecting rotation.

[0048] In one specific embodiment, a display controller 16 is also included. The display controller 16 is electrically connected to the photoelectric pulse generator 5. The display controller 16 can supply power to the photoelectric pulse generator 5, set parameters, and display and save data such as speed and acceleration.

[0049] The speed measuring instrument proposed in this invention has an accuracy of 0.1%, which can analyze the operating status of the trailer in terms of acceleration, steady speed, etc. It can also be used to compare and analyze the speed data obtained by the speed measuring instrument installed on the motor shaft. The speed of the trailer measured by this device through the photoelectric generator and the speed measuring wheel 4 is not affected by driving factors such as speed reduction gear and universal joint clearance compared with the prior art, and the obtained speed data is more accurate.

[0050] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A coaxial photoelectric speed measuring device for towing a water tank trailer, characterized in that: include The two frame side plates have a first mounting slot and a second mounting slot on their front and rear sides, respectively. The U-shaped bearing plate has two side plates located in the first mounting slots of the two frame side plates, and the upper and lower ends of the U-shaped bearing plate side plates are connected to the frame side plates through the first pin. The axle is rotatably mounted between the two side plates of the U-shaped bearing plate via a bearing; The speed measuring wheel is fixed on the axle. A photoelectric pulse generator is fixed on the outer side of the side plate of the U-shaped bearing plate. The photoelectric pulse generator includes a grating disk, which is fixed on the wheel axle. A square plate has two sides located in the second mounting slots of the two frame side plates, and the upper and lower ends of both sides of the square plate are connected to the frame side plates through the second pins. A clamp-shaped plate includes a middle plate and two clamp parts fixed to the lower sides of the middle plate and extending forward. The protruding ends of the two clamp parts are respectively located on both sides of the square plate and connected to the square plate by a third pin. The fastener includes an upper plate and a lower plate, and a connecting plate connecting the upper plate and the lower plate. The upper plate and the lower plate are located on the upper and lower sides of the middle plate, respectively, and are connected to the middle plate by a fourth pin. Two adjusting handles are located on both sides of the connecting plate and are threadedly connected to the connecting plate. The angle between the intermediate plate and the connecting plate can be changed by rotating the two adjusting handles to push against the intermediate plate.

2. The coaxial photoelectric speed measuring device for towing a water tank trailer according to claim 1, characterized in that: It also includes a pressure regulating component, the pressure regulating component comprising... Two bolts are threaded through the square plate and connected to the intermediate plate. Two springs are respectively fitted onto the two bolts and located between the square plate and the middle plate, with the two ends of the two springs abutting against the square plate and the middle plate respectively.

3. The coaxial photoelectric speed measuring device for towing a water tank trailer according to claim 1, characterized in that: It also includes a display controller, which is electrically connected to the photoelectric pulse generator.

4. A coaxial photoelectric speed measuring device for towing a water tank trailer according to claim 1, characterized in that: The upper plate has openings and positioning grooves on its rear side for connection, fixation and positioning with the trailer.

5. A coaxial photoelectric speed measuring device for towing a water tank trailer according to claim 1, characterized in that: The side plates of the U-shaped bearing plate and the first mounting slot are both adapted to have a structure that is wider at the front and narrower at the back.

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