A vertical calibration device for a pull cord sensor

Abstract

The utility model relates to a kind of vertical calibration device of pull rope sensor, and the device includes: horizontal base: horizontally fixed installation is on workbench surface;Positioning component: set in the one side of horizontal base, to install and position the angle measurement unit to be calibrated;Height adjusting component: set in the other side of horizontal base, to adjust and position driving engagement component in vertical direction;Driving engagement component: including installation on the height adjusting component stepper motor and setting on the transmission gear piece of stepper motor output shaft, the transmission gear piece is engaged with the driven gear of the pull rope sensor product to be calibrated, and guide angle is set on transmission gear piece and driven gear. Compared with prior art, the utility model has the advantages of being suitable for vertical calibration, high operating safety, etc.

Description

Technical Field

[0001] This utility model relates to the field of pull-rope sensor manufacturing, and in particular to a vertical calibration device for a pull-rope sensor. Background Technology

[0002] The existing Hall effect pull-wire displacement sensor (hereinafter referred to as pull-wire sensor) mainly consists of a housing, pull wire, reel, coil spring, transmission component, and PCB board with Hall chip. When length or displacement measurement is required, the Hall chip is used to detect the rotation angle of the shaft and then convert it into the length of the pull wire. It can be seen that the detection accuracy of the Hall chip has a crucial impact on the detection accuracy of the pull-wire sensor. Therefore, the Hall chip needs to be calibrated before production and installation.

[0003] However, since most pull-wire displacement sensors using Hall chips currently employ gear meshing for transmission, during calibration, the transmission gear is brought close together horizontally and meshed with a gear containing a magnet before proceeding with the subsequent calibration process. However, this calibration method is not suitable for pull-wire sensors whose transmission shaft needs to be installed vertically from top to bottom. Therefore, a Hall chip calibration device for pull-wire sensors that can meet the requirements of vertical installation is needed. Utility Model Content

[0004] To address the technical problems in the background art, this utility model provides a vertical calibration device for a pull-rope sensor, the device comprising:

[0005] Horizontal base: horizontally fixedly installed on the workbench;

[0006] Positioning component: Located on one side of the horizontal base, used to install and position the angle measuring unit to be calibrated;

[0007] Height adjustment component: Located on the other side of the horizontal base, used to adjust and position the drive engagement component in the vertical direction;

[0008] Drive engagement assembly: includes a stepper motor mounted on the height adjustment assembly and a transmission gear component disposed on the output shaft of the stepper motor. The transmission gear component meshes with the driving gear and driven gear of the pull rope sensor product to be calibrated, respectively, and guide angles are respectively provided on the surfaces of the transmission gear component opposite to the driving gear and driven gear.

[0009] Host computer: Connected to both the stepper motor and the angle measurement unit to be calibrated.

[0010] Furthermore, the guide angle on the transmission gear component is smaller than the guide angle on the driving gear and the driven gear, and the lead of the guide angle on the transmission gear component is greater than the lead of the guide angle on the driving gear and the driven gear. The guide angle and lead of the driving gear and the driven gear are the same.

[0011] Furthermore, the guide angle on the transmission gear component is 20° and the lead is 3mm, while the guide angle on the driving gear and the driven gear is 30° and the lead is 1mm.

[0012] Furthermore, the horizontal base is provided with a mounting position for placing a level.

[0013] Furthermore, the positioning component includes a positioning seat fixed to one side of the horizontal base and a plurality of positioning posts respectively disposed on the upper surface of the positioning seat. The positioning seat has a variety of thicknesses, and the number of positioning posts is at least three.

[0014] Furthermore, the height adjustment assembly includes an L-shaped fixed base fixedly installed on one side of the horizontal base, an upper baffle and a lower baffle respectively disposed at the upper and lower ends of the upright plate of the L-shaped fixed base, a lead screw, a vertical slide rail disposed between the upper and lower baffles, a slide rail slider slidably disposed on the vertical slide rail, a lead screw nut sleeved on the threaded part of the lead screw, a locking handle and a handwheel. The lower end of the lead screw is rotatably connected to the lower baffle, and the upper end passes through the upper baffle and is connected to the handwheel, and is locked and limited by the locking handle. The lead screw nut is disposed in the slide rail slider and moves up and down together with the slide rail slider.

[0015] Furthermore, the drive engagement assembly also includes a motor bracket base and a motor bracket, the stepper motor is vertically mounted on the motor bracket, and the motor bracket is fixedly mounted on the slide rail slider through the motor bracket base.

[0016] Furthermore, the L-shaped fixing seat is also provided with a reinforcing plate.

[0017] Furthermore, an angle scale is evenly arranged around the circumference on the upper surface of the handwheel.

[0018] Furthermore, the transmission gear component is identical to the transmission gear of the pull rope sensor product in terms of radius, number of teeth, and tooth pitch, and the transmission gear of the pull rope sensor product has a guide angle with the same angle and lead as the driving gear and driven gear.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] This utility model provides a vertical calibration device for a pull-rope sensor, which can meet the needs of pull-rope sensor products that require vertical installation of transmission gears. By setting guide angles and lead on the transmission gear, driving gear and driven gear respectively, it can effectively prevent damage caused by the transmission gear not meshing with the driven gear during downward movement, and automatically align the teeth to complete the meshing. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a vertical calibration device for a pull-rope sensor proposed in this utility model;

[0022] Figure 2 This is a cross-sectional view of the present invention;

[0023] Figure 3 This is a structural schematic diagram of a transmission gear component;

[0024] Figure 4 Figure 4a shows a schematic diagram of the transmission gear meshing with the driving gear and the driven gear respectively. Figure 4b shows a schematic diagram of the position in the fully disengaged state and the position in the fully engaged state.

[0025] Figure 5 This is a schematic diagram of the structure for calibrating the installation angle measuring unit according to this utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Horizontal base plate, 2. Positioning seat, 3. Positioning column, 4. Transmission gear, 5. Motor bracket, 6. Stepper motor, 7. Lead screw slider, 8. Motor bracket base, 9. L-shaped fixing seat, 10. Locking handle, 11. Handwheel. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0029] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model 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 limitations on the utility model.

[0031] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0032] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0034] Example

[0035] This utility model provides a vertical calibration device for a pull-string sensor, used to mesh the transmission gear 4 with the gear set (driving gear and driven gear) of the angle measuring unit from top to bottom in the vertical direction, and to drive the transmission, thereby achieving the calibration of the Hall chip. Figure 1 As shown, the vertical calibration device includes a horizontal base 1, a positioning component, a height adjustment component, a drive engagement component, and a host computer. The components are described in detail below with reference to the accompanying drawings.

[0036] The horizontal base 1 is fixed on the workbench. Specifically, it is a rectangular metal plate with rounded corners, which is used to support and fix the positioning component and the height adjustment component. The upper surface of the horizontal base 1 also has a mounting position for placing the level, so that the horizontal base, the angle measuring unit to be calibrated, the height adjustment component, and the drive engagement component are all kept horizontal, ensuring smooth gear engagement.

[0037] The positioning assembly is used to fix the angle measuring unit to be calibrated, so that the gear set of the angle measuring unit to be calibrated and the transmission gear 4 can mesh and align in a horizontal position. The positioning assembly includes a positioning seat 2 fixed to one side of the horizontal base 1 and multiple positioning posts 3 respectively set on the upper surface of the positioning seat 2. The positioning seat 2 is a metal plate with a hollow center to reduce weight and processing complexity. The positioning seat 2 has various thicknesses to accommodate angle measuring units of different heights. There are generally at least 3 positioning posts 3 (4 in this example, respectively set at the four corners of the positioning seat 2). The lower end of the posts is fixedly connected to the positioning seat 2, and the upper end is inserted and positioned with the angle measuring unit to be calibrated.

[0038] A height adjustment component is installed on the other side of the horizontal base 1, opposite to the positioning component, to adjust and position the height of the drive engagement component in the vertical direction. This height adjustment component includes an L-shaped fixed base 9, an upper baffle, a lower baffle, a lead screw, a vertical slide rail, a slide rail slider 7, a lead screw nut, a locking handle 10, and a handwheel 11. The base plate of the L-shaped fixed base 9 is bolted to the other side of the horizontal base 1. The upper and lower baffles are horizontally fixed to the top and bottom of the upright plate of the L-shaped fixed base 9, respectively. The vertical slide rail is fixed to the upright plate of the L-shaped fixed base 9. Located on the side between the upper and lower baffles, the lower end of the lead screw is rotatably connected to the lower baffle via a lower bearing, and the upper end passes through the upper bearing on the upper baffle and is connected to the handwheel 11. It is locked and limited by the locking handle 10. The lead screw nut is sleeved on the outside of the threaded part of the lead screw and is fixedly installed inside the slide rail slider 7 and moves up and down with it. The slide rail slider 7 is slidably connected to the vertical slide rail. As the lead screw rotates, the slide rail slider 7 drives the lead screw nut to move up and down along the vertical slide rail in the vertical direction, thereby adjusting the height of the drive engagement assembly in the vertical direction.

[0039] In addition, a stiffening plate is provided on the L-shaped fixing base 9 to increase the stability of the L-shaped fixing base 9. An angle scale is evenly opened around the circumference on the upper surface of the handwheel 11 to record the position of the handwheel 11 corresponding to different models of angle measuring units when the gears are fully engaged. This allows for quick operation when changing sensor product models in the future, improves efficiency, and prevents height mismatch.

[0040] In another embodiment, the handwheel 11 of the device can be replaced with a drive / transmission component that rotates automatically and can control the rotation angle and position, such as a motor and coupling controlled by a host computer. The host computer controls the motor to rotate, thereby driving the lead screw to rotate and achieve vertical position adjustment.

[0041] The drive engagement assembly includes a motor bracket base 8, a motor bracket 5, a stepper motor 6, and a transmission gear 4 mounted on the output shaft of the stepper motor 6. The drive engagement assembly is used to provide rotational driving force to the transmission gear 4. The motor bracket base 8 is a connector that is fixedly connected to the outer side of the slide rail slider 7. The motor bracket 5 is fixedly mounted on the motor bracket base 8. The stepper motor 6 is vertically fixed on the motor bracket 5 by mounting screws and communicates with the host computer through a communication cable to achieve control.

[0042] In another embodiment, the drive engagement assembly also includes a scanner (which can be fixedly mounted on the front end of the motor bracket 5) for scanning the QR code / barcode indicating product information on the housing of the pull-wire sensor product to be calibrated. The scanner is connected to the host computer. When the pull-wire sensor product to be calibrated is fixed on the positioning assembly, the host computer will automatically obtain the product information of the pull-wire sensor product by scanning the QR code / barcode corresponding to the product.

[0043] like Figure 3 As shown, the transmission gear 4 is a metal gear component, consisting of a cylindrical sleeve and a gear portion integrally formed on the outer side of the bottom end of the sleeve. The cylindrical sleeve is fitted onto the output shaft of the stepper motor 6 and rotates synchronously with the output shaft of the stepper motor 6. The gear portion is identical in radius, number of teeth, and tooth pitch to the gear on the transmission shaft of the angle measuring unit to be calibrated, ensuring that the transmission gear 4 can fully mesh with the driving and driven gears of the angle measuring unit to be calibrated. In addition, to prevent damage to the teeth caused by misalignment between the transmission gear 4 and the gear set of the angle measuring unit to be calibrated when the transmission gear 4 moves downward via the height adjustment component, the transmission gear 4 cannot mesh vertically. In this invention, a guide angle is provided on the lower surface of the gear part of the transmission gear component 4, and a guide angle is also provided on the upper surface of the driving gear and the driven gear. In this example, due to the limitation of installation space, the guide angles provided on the lower surface of the transmission gear and the upper surface of the driving gear and the driven gear of the pull rope sensor product are relatively large and have a short lead. However, the transmission gear component 4, as a tool, is not limited by the installation space. In order to ensure smooth meshing, its corresponding guide angle is relatively small and has a long lead. Thus, when the transmission gear component 4 moves downward and encounters the driving gear and the driven gear, the guiding effect of the guide angle allows the gear part of the transmission gear component 4 to mesh smoothly with the gear set, effectively preventing the above-mentioned problems from occurring.

[0044] Through actual testing, the guide angle of the lower surface of the gear part of the transmission gear component 4 is 20° and the lead is 3mm. The guide angle of the lower surface of the transmission gear and the upper surface of the driving gear and driven gear are both 30° and the lead is 1mm.

[0045] like Figure 5As shown, the specific steps for calibrating the Hall chip of the pull-cord sensor product using this device are as follows:

[0046] 1. Place the calibration device horizontally on the workbench and fix it in place. Select a positioning seat 2 that is suitable for the type, thickness and positioning position of the angle measurement unit to be calibrated.

[0047] 2. Rotating the handwheel 11 drives the lead screw to rotate, causing the lead screw slider 7 to move upward, thereby lifting the stepper motor 6 and the transmission gear 4. After lifting, the angle measuring unit to be calibrated is fixedly installed on the positioning seat 2 through the positioning post 3. In this example, the angle measuring unit consists of a PCB board with a Hall chip, a fixing frame, and a driving gear and a driven gear with magnets. The PCB board is fixed above the fixing frame. The driving gear and the driven gear are rotatably set on the left and right sides of the central through hole of the fixing frame, respectively, at the position directly opposite the Hall chip. The transmission gear is a component of the pull rope sensor product and is installed at the top of the transmission shaft to realize the meshing transmission between the transmission shaft and the angle measuring unit.

[0048] 3. Rotate the handwheel 11 in the opposite direction to drive the lead screw to rotate and make the lead screw slider 7 move downward until the transmission gear 4 is fully engaged with the driving gear and driven gear of the angle measuring unit to be calibrated. At this time, pull the locking handle 10 to fix the vertical height position of the transmission gear 4.

[0049] 4. The host computer controls the stepper motor 6 to start, making it rotate at a constant speed (100 r / min in this example) in the same direction, and starts the automatic calibration process. In this example, m angle calibration points are preset within the 360-degree range of one rotation of the magnet (for example, one angle calibration point is set every 30 degrees, for a total of 12). When the magnet on the gear rotates to the position of the angle calibration point, the output data of the Hall chip is collected. Within the set calibration time period (for example, 1 minute), the magnet rotates N times (100 times in this example), and the output data A of the magnet at the m angle calibration points is recorded. nm (A total of 1200 data points are collected in this example). Finally, the average value of the N output data points corresponding to each angle calibration point is taken as the final calibration value, thus completing the automatic calibration of the Hall chip.

[0050] 5. After automatic calibration is completed, stop the stepper motor 6, open the locking handle 10, turn the handwheel 11 to drive the lead screw to rotate and make the lead screw slider 7 move upward until the transmission gear 4 is completely separated from the driving gear and driven gear of the angle measuring unit to be calibrated. Remove the current angle measuring unit to be calibrated as a prefabricated part and enter the subsequent production assembly process. Return to step 1 to carry out the calibration process of the next angle measuring unit to be calibrated.

[0051] In summary, the vertical calibration device for a pull-string sensor provided by this utility model realizes the function of calibrating the Hall chip in the angle measuring unit from the vertical direction.

[0052] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A vertical calibration device for a pull-string sensor, characterized in that, The device includes: Horizontal base (1): Horizontally fixed on the workbench; Positioning component: Located on one side of the horizontal base (1), used to install and position the angle measuring unit to be calibrated; Height adjustment component: located on the other side of the horizontal base (1), used to adjust and position the drive engagement component in the vertical direction; Drive engagement assembly: includes a stepper motor (6) mounted on the height adjustment assembly and a transmission gear (4) disposed on the output shaft of the stepper motor (6). The transmission gear (4) meshes with the driving gear and driven gear of the pull rope sensor product to be calibrated, respectively, and guide angles are respectively provided on the surfaces of the transmission gear (4) opposite to the driving gear and driven gear. Host computer: connected to the stepper motor (6) and the angle measurement unit to be calibrated respectively.

2. The vertical calibration device for a drawstring sensor according to claim 1, characterized in that, The guide angle on the transmission gear component (4) is smaller than the guide angle on the driving gear and the driven gear. The lead of the guide angle on the transmission gear component (4) is greater than the lead of the guide angle on the driving gear and the driven gear. The guide angle and lead of the driving gear and the driven gear are the same.

3. The vertical calibration device for a drawstring sensor according to claim 2, characterized in that, The guide angle on the transmission gear (4) is 20° and the lead is 3mm. The guide angle on the driving gear and the driven gear is 30° and the lead is 1mm.

4. The vertical calibration device for a drawstring sensor according to claim 1, characterized in that, The horizontal base (1) is provided with a mounting position for placing a level.

5. The vertical calibration device for a drawstring sensor according to claim 1, characterized in that, The positioning assembly includes a positioning seat (2) fixed to one side of a horizontal base (1) and a plurality of positioning posts (3) respectively disposed on the upper surface of the positioning seat (2). The positioning seat (2) has a variety of thicknesses and the number of positioning posts (3) is at least 3.

6. The vertical calibration device for a drawstring sensor according to claim 1, characterized in that, The height adjustment assembly includes an L-shaped fixed base (9) fixedly installed on one side of the horizontal base (1), an upper baffle and a lower baffle respectively set at the upper and lower ends of the upright plate of the L-shaped fixed base (9), a lead screw, a vertical slide rail set between the upper baffle and the lower baffle, a slide rail slider (7) slidably set on the vertical slide rail, a lead screw nut sleeved on the threaded part of the lead screw, a locking handle (10) and a handwheel (11). The lower end of the lead screw is rotatably connected to the lower baffle, and the upper end passes through the upper baffle and is connected to the handwheel (11), and is locked and limited by the locking handle (10). The lead screw nut is set in the slide rail slider (7) and moves up and down together with the slide rail slider (7).

7. The vertical calibration device for a drawstring sensor according to claim 1, characterized in that, The drive engagement assembly also includes a motor bracket base (8) and a motor bracket (5). The stepper motor (6) is vertically mounted on the motor bracket (5), and the motor bracket (5) is fixedly mounted on the slide rail slider (7) through the motor bracket base (8).

8. The vertical calibration device for a drawstring sensor according to claim 6, characterized in that, The L-shaped fixing seat (9) is also provided with a reinforcing plate.

9. The vertical calibration device for a drawstring sensor according to claim 6, characterized in that, The upper surface of the handwheel (11) is uniformly marked with an angle scale along the circumference.

10. A vertical calibration device for a drawstring sensor according to claim 2, characterized in that, The transmission gear component (4) is identical to the transmission gear of the rope sensor product in terms of radius, number of teeth, and tooth pitch. Furthermore, the transmission gear of the rope sensor product has a guide angle with the same angle and lead as the driving gear and driven gear.

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