Paddle mold shafting balance thrust calibration method and device

Abstract

The invention discloses a paddle mold shafting balance thrust calibration method and device, the device is used in cooperation with a shafting which is provided with a paddle mold and comprises a sensor, the sensor is electrically connected with an acquisition system, one end of the shafting is a contact end, the paddle mold is installed on the shafting close to the contact end during calibration, and the shafting is horizontally placed. The calibration device comprises a thrust applying part, the thrust applying part is provided with a thrust applying end, the thrust applying end abuts against the contact end in the horizontal direction during calibration, the thrust applying part can provide a plurality of known forces so that the thrust applying end can act on the contact end, and the sensor outputs a parameter value corresponding to each known force. Under the condition that installation of the paddle mold is not affected, thrust can be provided for the shaft system, and calibration can be carried out when the paddle mold is static or the shaft system rotates slowly.

Description

Technical Field

[0001] The present invention relates to the technical field related to balance calibration, and in particular to a propeller model shaft system balance thrust calibration method and device. Background Art

[0002] In the process of developing new ships or propellers, various types of model tests are required to predict their navigation performance. The most important of these is to evaluate the various performance indicators of the ship by testing the thrust torque on the propeller model shaft. The key equipment for testing the thrust of the propeller model on the shaft system mainly includes shaft-type tension-torsion composite sensors, open water dynamometers, self-propelled dynamometers, etc. Generally speaking, these test equipment need to be calibrated regularly every year using professional calibration equipment, and the equipment should also be calibrated before use. This is the basis for ensuring the effectiveness and accuracy of laboratory tests.

[0003] The method used for calibration of propeller model shaft balance is usually as follows: Taking into account the limitation that one end of the shaft needs to be installed with components such as a motor, and without installing a propeller model at the other end of the shaft, a wire rope is fixed to the other end, and a standard weight is hung through a pulley so that the gravity of the weight acts as a pulling force on the end of the shaft. The load (that is, the weight of the weight) is gradually increased from small to large, and the gravity of the weight and the output value of the sensor are compared. The parameters of the sensor are calibrated so that the test results are within the required accuracy range. Multi-point calibration and repeatability calibration are also performed during the process.

[0004] Combination Figure 1As mentioned above, during the calibration of the propeller shaft balance, a static tensile force is applied to the end of the propeller shaft through a weight. However, in fact, the propeller shaft is subjected to thrust in a rotating state during testing, that is, the force on the shaft is pressure rather than tension, which is opposite to the force during calibration. This calibration method has certain defects: first, the slope of the positive and negative loading of the sensor often has a certain error. Secondly, the initial friction force in a static state is generally greater than the friction force in a rotating state. In particular, these devices are usually equipped with seals to achieve underwater testing. The seals are subjected to different forces in different directions, static and rotating. This makes the device error within the accuracy range during calibration, but the error is unknown during actual testing, and the error risk is uncontrollable. Furthermore, the propeller model is not used during calibration, but is used during testing. If the mass of the propeller model is large, its gravity may affect the accuracy of the test. For example, the patent document with publication number "CN115560907 A" discloses a calibration device for a thrust balance, which adopts the tension method mentioned above for calibration; and the prior art related to the calibration of the shaft balance is not retrieved, only the calibration-related patents are retrieved, for example: the invention patent with publication number "CN117686137A" - a horizontal force balance calibration device and calibration method and the invention patent with publication number "CN112326113A" - a force balance calibration system and method, but the technical contents disclosed in these prior arts are not closely related to the relevant technical problems recognized by this application.

[0005] Therefore, how to provide a propeller model shaft balance thrust calibration method and device that can solve the above-mentioned drawbacks has become a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0006] To achieve the above purpose, the present invention provides a propeller model shaft balance thrust calibration device. The specific technical solution is as follows:

[0007] A propeller model shaft system balance thrust calibration device is used in conjunction with a shaft system with a propeller model installed and including a sensor, the sensor being electrically connected to a collection system, one end of the shaft system being a contact end, the propeller model being installed on the shaft system adjacent to the contact end during calibration and the shaft system being placed horizontally, the calibration device comprising a thrust applying portion, the thrust applying portion having a thrust applying end, during calibration the thrust applying end being in horizontal contact with the contact end and the thrust applying portion being able to provide a number of known forces so as to act on the contact end through the thrust applying end, and corresponding to each known force, the sensor outputs a parameter value.

[0008] Preferably, the thrust applying portion comprises:

[0009] A lever arm has a force-applying section and a force-receiving section, wherein the force-applying section is used to hang weights of different weights, and the force-receiving section is a horizontal section at a position away from the force-applying section, and the free end of the horizontal section forms the thrust-applying end, and a leveling component is provided on the lever arm to adjust the lever arm to a horizontal state when no weight is hung;

[0010] The upper end of the liftable support body is a support end that forms a fulcrum of the lever arm so that the height of the lever arm can be adjusted.

[0011] Preferably, the force arm lever is L-shaped, the long side of the L-shape is mounted on the fulcrum, a section of the long side of the L-shape away from its short side forms the force-applying section, the remaining section of the long side and the short side form the force-bearing section, and a conical force-applying ejector pin is installed at the end of the short side to form the horizontal section, the center line of the force-applying ejector pin is perpendicular to the short side, and the needle tip of the force-applying ejector pin forms the thrust-applying end.

[0012] Preferably, the leveling component includes: a leveling groove is provided on the upper surface of the long side of the L-shape forming the force-applying section and the outer surface of the short side of the L-shape, a nut is slidably arranged in the leveling groove, a leveling bolt is arranged corresponding to each nut, a nut and a corresponding leveling bolt form a leveling bolt group, and the leveling bolt is tightened in conjunction with the nut so that the leveling bolt group is in a fixed position in the leveling groove.

[0013] Preferably, a rotatable steel ball is embedded in the top end of the force applying ejector pin.

[0014] Preferably, the liftable support body comprises:

[0015] A sliding body having a length, wherein one end of the sliding body along the length direction forms the support end and the other end forms the insertion end;

[0016] A receiving base, wherein a slideway having a length and a shape matching the shape of the sliding body is disposed inside the receiving base, the slideway is disposed in an opening, the insertion end is inserted into the slideway through the opening and can slide up and down along the slideway, and two rows of fixing holes are disposed on the outer side wall of the receiving base corresponding to the slideway, and each row of fixing holes includes a plurality of first threaded holes disposed at intervals in the vertical direction;

[0017] A fixing plate is provided with a plurality of second threaded through holes penetrating the fixing plate and corresponding to the positions of the two rows of fixing holes, and a pressing plate is installed on the top of the fixing plate for pressing the outer wall of the sliding body so that the sliding body can be fixed in the slideway;

[0018] A plurality of bolts are threadedly connected with the corresponding second threaded holes and the first threaded holes so that the fixing plate is fixed on the accommodating base.

[0019] Preferably, the accommodating base comprises:

[0020] A base plate, in which a horizontal slide groove is provided, and adjustment threaded through holes are provided on both sides of the base plate located on the left and right sides of the horizontal slide groove, and the adjustment threaded through holes are connected to the horizontal slide groove;

[0021] A containing body having a length, wherein the slideway is provided in the containing body, wherein the bottom end of the containing body is located in the horizontal slide groove and can reciprocate along the horizontal slide groove in a horizontal direction;

[0022] Two adjusting bolts correspond to the two adjusting threaded through holes respectively, and the ends of the two adjusting bolts can be pressed against the left and right sides of the containing body to fix the containing body.

[0023] Preferably, the cross-section of the sliding body is trapezoidal in shape.

[0024] Preferably, the bottom of the base plate is formed as a magnetic base and / or the four corners of the base plate are provided with base threaded holes for screws to pass through.

[0025] Preferably, the support end on the sliding body is in a V-shaped structure, and a bearing is provided at a position on the force arm lever corresponding to the V-shaped structure, and this position forms the rotation center of the force arm lever.

[0026] Preferably, three level bubbles are installed on the force arm lever, one level bubble is installed directly above the rotation center of the force arm lever on the long side of the L-shape, and the remaining two level bubbles are respectively installed on the front and rear sides of the force application section of the force arm lever.

[0027] Preferably, it also includes a balance pointer, which is installed on the lever arm at a position corresponding to its rotation center, the pointer of the balance pointer points to a sliding body located below the lever arm, and a ±10° scale is set on the surface of the sliding body corresponding to the pointer.

[0028] Preferably, two hanging points are provided on the force applying section of the force arm lever for hanging weights, the distance from one hanging point to the rotation center is equal to the distance from the steel ball in the top end of the force applying pin to the rotation center, and the distance from the other hanging point to the rotation center is 1.5 times the distance from the steel ball in the top end of the force applying pin to the rotation center.

[0029] The present invention also provides a propeller model shaft system balance thrust calibration method, which uses the propeller model shaft system balance thrust calibration device described above for calibration, and comprises the following steps:

[0030] (1) Calibrate the environment, clear the site, install the propeller model, connect the acquisition system and preheat it;

[0031] (2) When no weight is hung, observe the level bubble or balance pointer to determine whether the lever arm is level; if so, proceed to the next step; if not, adjust the number or position of the leveling bolt group so that the lever arm is approximately level with the shaft system and the top of the force-applying thimble is slightly raised;

[0032] (3) Fix the leveling bolt group, lightly touch the force-applying ejector pin, and the lever arm will swing sensitively and eventually stop at the initial position before the light touch;

[0033] (4) The calibration device is installed at the contact end of the corresponding shaft system by means of magnetic attraction or screw fixing;

[0034] (5) Adjust the two adjusting bolts so that the force-applying ejector pin pushes against the shaft system in a state parallel to the shaft system;

[0035] (6) Start the drive motor connected to the shaft system to make the shaft system rotate slowly at a low speed;

[0036] (7) Using the current sensor sensitivity, record the value of the sensor on the acquisition system at this time and set it to zero as the test zero point;

[0037] (8) Gradually add weights as different known forces, record the parameter values ​​of the sensor each time, compare and analyze the gravity of the weights, and calculate whether the error is within the required range. If yes, proceed to the next step. If not, revise the sensor sensitivity based on the test results, input it into the acquisition system, and return to step (7);

[0038] (9) Write a calibration report based on the records.

[0039] The provided propeller model shaft balance thrust calibration method and device have the following technical effects:

[0040] Without affecting the installation of the propeller model, thrust can be provided to the shaft system, and calibration can be performed when the shaft system is stationary or rotating slowly. This calibration is the most stable, accurate, and highly repeatable. Providing a force consistent with the propeller model thrust direction at the front end of the shaft system solves the technical problem mentioned in the prior art that "the slope of positive and negative loading often has a certain error"; and the magnitude of the force can be adjusted, and in a preferred embodiment, it is adjusted by adding or removing weights.

[0041] The lever arm and the lifting support are designed separately. When the calibration range is wider, a larger thrust can be provided by replacing the lever arm. The height of the lever arm can be adjusted within a certain range to adapt to the calibration of shaft systems of different heights.

[0042] The leveling method of setting the leveling bolt group has a simple structure and is easy to achieve quick adjustment.

[0043] The top of the force-applying ejector pin is embedded with a rotatable steel ball. When the shaft system rotates slowly, the lever arm can also stably apply thrust to the shaft system. The calibration device can calibrate the shaft system when it rotates under the condition of providing thrust, solving the defect of "uncontrollable error risk" mentioned in the prior art.

[0044] The two adjusting bolts are used together to achieve fine adjustment of the position of the force arm lever and the shaft system, especially after the base plate is fixed, the position can still be finely adjusted to ensure stable contact between the force arm lever and the shaft system.

[0045] Design of three sets of level bubbles allows operators to observe at a wider angle, with smaller coaxial errors between the applied force and the axis system, making operation more convenient and calibration more accurate.

[0046] With a balance pointer, when the shaft system and the base plate have a certain inclination (propeller model pod test, common), the shaft system thrust can still be calibrated within the range of plus or minus 10 degrees;

[0047] By designing two weight hanging points, calibration can be performed with equal force and 1.5 times force. By using the same weight, the calibration range is wider.

[0048] During calibration, the top of the force-applying ejector pin is slightly lifted in step (2) so that the force-applying ejector pin at this position contacts the shaft system, which can more accurately make the two parallel and ensure that the thrust is accurately applied to the shaft system.

[0049] In step (6), the shaft system is rotated slowly at a low speed to ensure the stability of the contact between the force-applying ejector pin and the shaft system, thereby enabling more accurate calibration. If the speed is too fast, the two may not be in better contact due to possible vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a device used for calibration in the prior art, and the direction of the arrow in the figure is the direction of the pulling force provided;

[0051] Figure 2 A structural schematic diagram of a specific implementation of the provided propeller model shaft balance thrust calibration device;

[0052] Figure 3 for Figure 2 Schematic diagram from another perspective;

[0053] Figure 4 for Figure 3 Schematic diagram of the splitting;

[0054] Figure 5 A cross-sectional view of the provided propeller model shaft balance thrust calibration device;

[0055] Figure 6It is a schematic diagram of the structure of the provided propeller model shaft balance thrust calibration device during calibration;

[0056] Figure 7 A bottom view of a specific implementation of the provided propeller model shaft balance thrust calibration device;

[0057] Figure 8 The present invention is a flow chart of a specific implementation method of a propeller model shaft balance thrust calibration method.

[0058] Figure 1-8 The accompanying drawings are denoted as follows:

[0059] 1 propeller model, 2 shaft system, 3 contact end, 4 lever arm, 5 force section, 6 force section, 7 weight, 8 force ejector, 9 leveling slide, 10 leveling bolt group, 11 steel ball, 12 sliding body, 13 insertion end, 14 slide, 15 fixing plate, 16 base plate, 17 horizontal slide, 18 containing body, 19 adjusting bolt, 20 magnet, 21 base threaded hole, 22 V-shaped structure, 23 bearing, 24 rotation center, 25 level bubble, 26 balance pointer, 27 scale, 28 suspension point. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical scheme and advantages of the present invention clearer, the following is a further detailed description of a propeller model shaft balance thrust calibration method and device proposed by the present invention in combination with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.

[0061] The present invention provides a propeller shaft balance thrust calibration device, which is used in conjunction with a shaft 2 equipped with a propeller model 1 and including a sensor, wherein the sensor is electrically connected to a collection system, one end of the shaft 1 is a contact end 3, and during calibration, the propeller model 1 is installed on the shaft 2 adjacent to the contact end 3 and the shaft 2 is placed horizontally, and the calibration device includes a thrust applying portion, wherein the thrust applying portion has a thrust applying end, and during calibration, the thrust applying end abuts against the contact end 3 in a horizontal direction and the thrust applying portion can provide a number of known forces so that the thrust applying end acts on the contact end 3, and corresponding to each known force, the sensor outputs a parameter value.

[0062] Without affecting the installation of the propeller model 1, the device can provide thrust for the shaft system 2, and can also be calibrated when the shaft system 2 is stationary or slowly rotating, thereby avoiding the defect of the prior art that calibration is often performed by providing tension due to the environment in which the shaft system 2 is installed.

[0063] Combined with Figure 1-7 In a specific implementation manner, the thrust applying portion comprises:

[0064] The lever arm 4 has a force-applying section 5 and a force-receiving section 6. The force-applying section 5 is used to hang weights 7 of different weights. The force-receiving section 6 is a horizontal section at a position away from the force-applying section 5. The free end of the horizontal section forms the thrust-applying end. The lever arm 4 is provided with a leveling component for adjusting the lever arm 4 to be in a horizontal state when the weight 7 is not hung.

[0065] The upper end of the liftable support body is a support end that forms a fulcrum of the lever arm 4 so that the height of the lever arm 4 can be adjusted.

[0066] The calibration uses the lever arm 4 and the weight 7, because this form of calibration is the most stable, accurate, and highly repeatable. In addition, the lever arm 4 and the liftable support are designed separately. When the calibration range is wider, a greater multiple of thrust can be provided by replacing the lever arm 4. The height of the lever arm 4 can be adjusted within a certain range to adapt to the calibration of shaft systems 2 of different heights.

[0067] In a specific implementation manner, Figure 1-7As shown, the force arm lever 4 is L-shaped, the long side of the L-shape is mounted on the fulcrum, a section of the long side of the L-shape away from its short side forms the force-applying section 5, the remaining section of the long side and the short side form the force-bearing section 6, and a conical force-applying ejector pin 8 is installed at the end of the short side to form the horizontal section, the center line of the force-applying ejector pin 8 is perpendicular to the short side, and the needle tip of the force-applying ejector pin 8 forms the thrust-applying end; the leveling component comprises: a leveling slide groove 9 is provided on the upper surface of the long side of the L-shape forming the force-applying section 5 and the outer surface of the short side of the L-shape, a nut is slidably provided in the leveling slide groove 9, a leveling bolt is provided corresponding to one nut, and one nut and a corresponding leveling bolt form a leveling bolt group 10, and the leveling bolt cooperates with the nut to be tightened so that the leveling bolt group 10 is in a fixed position in the leveling slide groove 9;

[0068] It can be understood that the leveling component uses a nut in conjunction with a bolt. Specifically, the nut is able to slide in the leveling groove 9, and the relative upper edges of the leveling groove 9 are formed with relative inward folded edges. During the leveling process, by moving the nut and the corresponding leveling bolt, when the leveling effect is achieved, the leveling bolt is tightened so that its nut abuts against the folded edge, thereby achieving that the leveling bolt group 10 is in a fixed position in the leveling groove 9.

[0069] Further, such as Figure 1-7 As shown, a rotatable steel ball 11 is embedded in the top of the force-applying ejector pin 8; when the shaft system rotates slowly, the lever arm 4 can also stably apply thrust to the shaft system 2. The calibration device can calibrate the shaft system 2 when it rotates under the condition of providing thrust, solving the defect of "uncontrollable error risk" mentioned in the prior art.

[0070] In a specific implementation manner, Figure 1-7 As shown, the liftable support body comprises:

[0071] A sliding body 12 having a length, wherein one end of the sliding body 12 along the length direction forms the support end, and the other end forms the insertion end 13;

[0072] A receiving base, wherein a slideway 14 having a length and a shape matching the shape of the sliding body 12 is disposed inside the receiving base, the slideway 14 is disposed in an opening, the insertion end 13 is inserted into the slideway 14 through the opening and can slide up and down along the slideway 14, and two rows of fixing holes are disposed on the outer side wall of the receiving base corresponding to the slideway 14, and each row of fixing holes includes a plurality of first threaded holes disposed at intervals in the vertical direction;

[0073] A fixing plate 15 is provided with a plurality of second threaded through holes penetrating the fixing plate 15 and corresponding to the positions of the two rows of fixing holes. A pressing plate is installed on the top of the fixing plate 15 to press the outer wall of the sliding body 12 so that the sliding body 12 can be fixed in the slideway 14;

[0074] A plurality of bolts are threadedly connected to the corresponding second threaded holes and first threaded holes so that the fixing plate 15 is fixed on the receiving base.

[0075] The cross-section of the sliding body 12 is in the shape of a trapezoid.

[0076] The definition of this shape enables the two to achieve stable support and the matching setting of this shape can achieve precise positioning without deviation.

[0077] In a specific implementation manner, Figure 1-7 As shown, the receiving base includes:

[0078] A base plate 16, in which a horizontal slide groove 17 is formed, and adjustment thread holes are formed on both sides of the base plate 16, and the adjustment thread holes are connected to the horizontal slide groove 17;

[0079] A containing body 18 having a length, wherein the slideway 14 is provided in the containing body 18, wherein the bottom end of the containing body 18 is located in the horizontal slide groove 17 and can reciprocate along the horizontal slide groove 17;

[0080] The two adjusting bolts 19 correspond to the two adjusting threaded through holes respectively, and the ends of the two adjusting bolts 19 can be pressed against the left and right sides of the containing body 18 to fix the containing body 18.

[0081] The two adjusting bolts 19 are used together to achieve fine adjustment of the position of the force arm lever 4 and the shaft system 2, especially after the base plate 16 is fixed, the position can still be finely adjusted to ensure stable contact between the force arm lever 4 and the shaft system 2.

[0082] The bottom of the base plate 16 is formed as a magnetic base and / or the four corners of the base plate 16 are provided with base threaded holes 21 for screws to pass through. The magnetic base 16 can be implemented by arranging a plurality of magnets 20 on the bottom surface of the base plate 16. Generally, the calibration device is placed on the relevant equipment during calibration. The magnetic base can conveniently fix the calibration device on the metal surface; similarly, the screw can be fixed to the desired position by passing through the base threaded holes 21.

[0083] In a specific embodiment, the support end on the sliding body 12 is a V-shaped structure 22, and a bearing 23 is provided at a position on the lever arm 4 corresponding to the V-shaped structure 22, and the position forms a rotation center 24 of the lever arm 4. Stable support can be achieved and accurate positioning can be achieved without deviation under the action of the V-shaped structure.

[0084] Among them, three level bubbles 25 are installed on the force arm lever 4, one level bubble 25 is installed on the long side of the L-shaped corresponding force arm lever 4, and the remaining two level bubbles 25 are installed on the front and rear sides of the force application section 5 of the force arm lever 4. Designing three groups of level bubbles 25 allows the operator to observe at a larger angle, the coaxial error between the applied force and the shaft system 2 is smaller, the operation is more convenient, and the calibration is more accurate.

[0085] Further, such as Figure 1-7 As shown, it also includes a balance pointer 26, which is installed on the lever arm 4 at a position corresponding to the rotation center 24 thereof, and the pointer of the balance pointer 26 points to the sliding body 12 located below the lever arm 4, and a ±10° scale 27 is provided on the surface of the sliding body 12 corresponding to the pointer. With the balance pointer 26, when the shaft system 2 and the base plate 16 have a certain inclination (propeller model pod test, common), the shaft system thrust can still be calibrated within the range of plus or minus 10 degrees.

[0086] In a specific embodiment, two suspension points 28 are provided on the force applying section 5 of the force arm lever 4 for hanging the weight 7, the distance from one suspension point 28 to the rotation center 24 is equal to the distance from the steel ball 11 in the top end of the force applying pin 8 to the rotation center 24, and the distance from the other suspension point 28 to the rotation center 24 is 1.5 times the distance from the steel ball 11 in the top end of the force applying pin 8 to the rotation center 24.

[0087] Two weight hanging points 28 are designed so that calibration can be performed with equal force and 1.5 times force. The same weight is used and the calibration range is larger.

[0088] The present invention also provides a propeller model shaft system balance thrust calibration method, which uses the propeller model shaft system balance thrust calibration device described above for calibration, combined with Figure 8 , including the following steps:

[0089] (1) Calibrate the environment and clear the site, install the propeller model 1, connect the acquisition system and preheat it;

[0090] (2) When no weight is hung, observe the level 25 or the balance pointer 26 to determine whether the lever arm 4 is horizontal; if so, proceed to the next step; if not, adjust the number or position of the leveling bolt group 10 so that the lever arm 4 is approximately horizontal with the shaft system 2, and the top of the force-applying ejector pin 8 is slightly lifted;

[0091] (3) Fix the leveling bolt group 10, lightly touch the force applying ejector pin 8, and the lever arm 4 swings sensitively and eventually stops at the initial position before the light touch;

[0092] (4) The calibration device is installed at the position of the contact end 3 corresponding to the shaft system 2 by means of magnetic attraction or screw fixing;

[0093] (5) Adjust the two adjusting bolts 19 so that the force applying pin 8 is parallel to the shaft system 2 and supports the shaft system 2;

[0094] (6) starting the drive motor connected to the shaft system 2 to make the shaft system 2 rotate slowly at a low speed;

[0095] (7) Using the current sensor sensitivity, record the value of the sensor on the acquisition system at this time and set it to zero as the test zero point;

[0096] (8) Gradually add weights 7 as different known forces, record the parameter values ​​of the sensor each time, compare and analyze the gravity of the weights, and calculate whether the error is within the required range. If yes, proceed to the next step. If not, revise the sensor sensitivity based on the test results, input it into the acquisition system, and return to step (7);

[0097] (9) Write a calibration report based on the records.

[0098] In a specific implementation, during calibration, equal force is used for calibration, that is, the distance from the suspension point 28 to the rotation center 24 is equal to the distance from the steel ball 11 in the top of the force-applying ejector pin 8 to the rotation center 24. According to the weights of different grams, the different parameter values ​​of the sensor are recorded accordingly, as shown in the following table. Figure 1 Similar experiments were also conducted on the existing methods, and the specific results are as follows:

[0099]

[0100]

[0101] The above values ​​obtained by the method of the present application can be compared with the original relevant values ​​of the sensor when it leaves the factory to calculate whether the error is within the required range. At the same time, the above comparison results further illustrate the defect mentioned in the background technology section that "the slope of the forward and reverse loading of the sensor often has a certain error", and the thrust calibration method of the present application can solve this defect.

[0102] This method has the same technical effects as mentioned above.

[0103] Furthermore, the calibration device and calibration method can also be used to collect statistics on original values ​​of sensors when they leave the factory.

[0104] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A propeller model shaft balance thrust calibration device, characterized in that: It is used in conjunction with a shaft system that is installed with a propeller model and includes a sensor, the sensor is electrically connected to a collection system, one end of the shaft system is a contact end, during calibration, the propeller model is installed on the shaft system adjacent to the contact end and the shaft system is placed horizontally, the calibration device includes a thrust applying part, the thrust applying part has a thrust applying end, during calibration, the thrust applying end abuts against the contact end in a horizontal direction and the thrust applying part can provide a number of known forces so that they act on the contact end through the thrust applying end, and corresponding to each known force, the sensor outputs a parameter value.

2. The propeller model shaft balance thrust calibration device according to claim 1, characterized in that: The thrust applying part comprises: A lever arm has a force-applying section and a force-receiving section, wherein the force-applying section is used to hang weights of different weights, and the force-receiving section is a horizontal section at a position away from the force-applying section, and the free end of the horizontal section forms the thrust-applying end, and a leveling component is provided on the lever arm to adjust the lever arm to a horizontal state when no weight is hung; The upper end of the liftable support body is a support end that forms a fulcrum of the lever arm so that the height of the lever arm can be adjusted.

3. The propeller model shaft balance thrust calibration device according to claim 2, characterized in that: The force arm lever is L-shaped, and the long side of the L-shape is mounted on the fulcrum. A section of the long side of the L-shape away from its short side forms the force-applying section, and the remaining section of the long side and the short side form the force-bearing section. A conical force-applying ejector pin is installed at the end of the short side to form the horizontal section. The center line of the force-applying ejector pin is perpendicular to the short side, and the tip of the force-applying ejector pin forms the thrust-applying end.

4. The propeller model shaft balance thrust calibration device according to claim 3, characterized in that: The leveling component includes: a leveling groove is provided on the upper surface of the long side of the L-shape forming the force-applying section and the outer surface of the short side of the L-shape, a nut is slidably arranged in the leveling groove, a leveling bolt is arranged corresponding to each nut, a nut and a corresponding leveling bolt form a leveling bolt group, and the leveling bolt is tightened in conjunction with the nut so that the leveling bolt group is in a fixed position in the leveling groove.

5. The propeller model shaft balance thrust calibration device according to claim 4, characterized in that: A rotatable steel ball is embedded in the top end of the force applying ejector pin.

6. The propeller model shaft balance thrust calibration device according to claim 5, characterized in that: The liftable support body comprises: A sliding body having a length, wherein one end of the sliding body along the length direction forms the support end and the other end forms the insertion end; A receiving base, wherein a slideway having a length and a shape matching the shape of the sliding body is disposed inside the receiving base, the slideway is disposed in an opening, the insertion end is inserted into the slideway through the opening and can slide up and down along the slideway, and two rows of fixing holes are disposed on the outer side wall of the receiving base corresponding to the slideway, and each row of fixing holes includes a plurality of first threaded holes disposed at intervals in the vertical direction; A fixing plate is provided with a plurality of second threaded through holes penetrating the fixing plate and corresponding to the positions of the two rows of fixing holes, and a pressing plate is installed on the top of the fixing plate for pressing the outer wall of the sliding body so that the sliding body can be fixed in the slideway; A plurality of bolts are threadedly connected with the corresponding second threaded holes and the first threaded holes so that the fixing plate is fixed on the accommodating base.

7. The propeller model shaft balance thrust calibration device according to claim 6, characterized in that: The receiving base comprises: A base plate, in which a horizontal slide groove is provided, and adjustment threaded through holes are provided on both sides of the base plate located on the left and right sides of the horizontal slide groove, and the adjustment threaded through holes are connected to the horizontal slide groove; A containing body having a length, wherein the slideway is provided in the containing body, wherein the bottom end of the containing body is located in the horizontal slide groove and can reciprocate along the horizontal slide groove in a horizontal direction; Two adjusting bolts correspond to the two adjusting threaded through holes respectively, and the ends of the two adjusting bolts can be pressed against the left and right sides of the containing body to fix the containing body.

8. The propeller model shaft balance thrust calibration device according to claim 7, characterized in that: The cross section of the sliding body is in the shape of a trapezoid.

9. The propeller model shaft balance thrust calibration device according to claim 7, characterized in that: The bottom of the base plate is formed as a magnetic base and / or the four corners of the base plate are provided with base threaded holes for screws to pass through.

10. The propeller model shaft balance thrust calibration device according to claim 7, characterized in that: The support end on the sliding body presents a V-shaped structure, and a bearing is arranged at a position on the force arm lever corresponding to the V-shaped structure, and this position forms the rotation center of the force arm lever.

11. The propeller model shaft balance thrust calibration device according to claim 10, characterized in that: Three level bubbles are installed on the force arm lever, one level bubble is installed on the long side of the L-shape just above the rotation center of the force arm lever, and the remaining two level bubbles are installed on the front and rear sides of the force application section of the force arm lever respectively.

12. The propeller model shaft balance thrust calibration device according to claim 11, characterized in that: It also includes a balance pointer, which is installed on the lever arm at a position corresponding to its rotation center. The pointer of the balance pointer points to a sliding body located below the lever arm. A ±10° scale is set on the surface of the sliding body corresponding to the pointer.

13. The propeller model shaft balance thrust calibration device according to claim 11, characterized in that: Two hanging points are provided on the force applying section of the force arm lever for hanging weights, the distance from one hanging point to the rotation center is equal to the distance from the steel ball in the top end of the force applying pin to the rotation center, and the distance from the other hanging point to the rotation center is 1.5 times the distance from the steel ball in the top end of the force applying pin to the rotation center.

14. A propeller model shaft balance thrust calibration method, characterized in that: Calibration is performed using the propeller model shaft balance thrust calibration device described in claim 12, comprising the following steps: (1) Calibrate the environment, clear the site, install the propeller model, connect the acquisition system and preheat it; (2) When no weight is hung, observe the level bubble or balance pointer to determine whether the lever arm is level; if so, proceed to the next step; if not, adjust the number or position of the leveling bolt group so that the lever arm is approximately level with the shaft system and the top of the force-applying thimble is slightly raised; (3) Fix the leveling bolt group, lightly touch the force-applying ejector pin, and the lever arm will swing sensitively and eventually stop at the initial position before the light touch; (4) The calibration device is installed at the contact end of the corresponding shaft system by means of magnetic attraction or screw fixing; (5) Adjust the two adjusting bolts so that the force-applying ejector pin pushes against the shaft system in a state parallel to the shaft system; (6) Start the drive motor connected to the shaft system to make the shaft system rotate slowly at a low speed; (7) Using the current sensor sensitivity, record the sensor value on the acquisition system at this time and set it to zero as the test zero point; (8) Gradually add weights as different known forces, record the parameter values ​​of the sensor each time, compare and analyze the gravity of the weights, and calculate whether the error is within the required range. If yes, proceed to the next step. If not, revise the sensor sensitivity based on the test results, input it into the acquisition system, and return to step (7); (9) Write a calibration report based on the records.

Images